- rel.3 - rebuild with fixed vserver patch

[packages/kernel.git] / linux-2.6-suspend2.patch

diff --git a/Documentation/power/tuxonice-internals.txt b/Documentation/power/tuxonice-internals.txt
new file mode 100644
index 0000000..68c0454
--- /dev/null
+++ b/Documentation/power/tuxonice-internals.txt
@@ -0,0 +1,474 @@
+                  TuxOnIce 3.0 Internal Documentation.
+                       Updated to 11 March 2008
+
+1.  Introduction.
+
+    TuxOnIce 3.0 is an addition to the Linux Kernel, designed to
+    allow the user to quickly shutdown and quickly boot a computer, without
+    needing to close documents or programs. It is equivalent to the
+    hibernate facility in some laptops. This implementation, however,
+    requires no special BIOS or hardware support.
+
+    The code in these files is based upon the original implementation
+    prepared by Gabor Kuti and additional work by Pavel Machek and a
+    host of others. This code has been substantially reworked by Nigel
+    Cunningham, again with the help and testing of many others, not the
+    least of whom is Michael Frank. At its heart, however, the operation is
+    essentially the same as Gabor's version.
+
+2.  Overview of operation.
+
+    The basic sequence of operations is as follows:
+
+       a. Quiesce all other activity.
+       b. Ensure enough memory and storage space are available, and attempt
+          to free memory/storage if necessary.
+       c. Allocate the required memory and storage space.
+       d. Write the image.
+       e. Power down.
+
+    There are a number of complicating factors which mean that things are
+    not as simple as the above would imply, however...
+
+    o The activity of each process must be stopped at a point where it will
+    not be holding locks necessary for saving the image, or unexpectedly
+    restart operations due to something like a timeout and thereby make
+    our image inconsistent.
+
+    o It is desirous that we sync outstanding I/O to disk before calculating
+    image statistics. This reduces corruption if one should suspend but
+    then not resume, and also makes later parts of the operation safer (see
+    below).
+
+    o We need to get as close as we can to an atomic copy of the data.
+    Inconsistencies in the image will result in inconsistent memory contents at
+    resume time, and thus in instability of the system and/or file system
+    corruption. This would appear to imply a maximum image size of one half of
+    the amount of RAM, but we have a solution... (again, below).
+
+    o In 2.6, we choose to play nicely with the other suspend-to-disk
+    implementations.
+
+3.  Detailed description of internals.
+
+    a. Quiescing activity.
+
+    Safely quiescing the system is achieved using three separate but related
+    aspects.
+
+    First, we note that the vast majority of processes don't need to run during
+    suspend. They can be 'frozen'. We therefore implement a refrigerator
+    routine, which processes enter and in which they remain until the cycle is
+    complete. Processes enter the refrigerator via try_to_freeze() invocations
+    at appropriate places.  A process cannot be frozen in any old place. It
+    must not be holding locks that will be needed for writing the image or
+    freezing other processes. For this reason, userspace processes generally
+    enter the refrigerator via the signal handling code, and kernel threads at
+    the place in their event loops where they drop locks and yield to other
+    processes or sleep.
+
+    The task of freezing processes is complicated by the fact that there can be
+    interdependencies between processes. Freezing process A before process B may
+    mean that process B cannot be frozen, because it stops at waiting for
+    process A rather than in the refrigerator. This issue is seen where
+    userspace waits on freezeable kernel threads or fuse filesystem threads. To
+    address this issue, we implement the following algorithm for quiescing
+    activity:
+
+       - Freeze filesystems (including fuse - userspace programs starting
+               new requests are immediately frozen; programs already running
+               requests complete their work before being frozen in the next
+               step)
+       - Freeze userspace
+       - Thaw filesystems (this is safe now that userspace is frozen and no
+               fuse requests are outstanding).
+       - Invoke sys_sync (noop on fuse).
+       - Freeze filesystems
+       - Freeze kernel threads
+
+    If we need to free memory, we thaw kernel threads and filesystems, but not
+    userspace. We can then free caches without worrying about deadlocks due to
+    swap files being on frozen filesystems or such like.
+
+    b. Ensure enough memory & storage are available.
+
+    We have a number of constraints to meet in order to be able to successfully
+    suspend and resume.
+
+    First, the image will be written in two parts, described below. One of these
+    parts needs to have an atomic copy made, which of course implies a maximum
+    size of one half of the amount of system memory. The other part ('pageset')
+    is not atomically copied, and can therefore be as large or small as desired.
+
+    Second, we have constraints on the amount of storage available. In these
+    calculations, we may also consider any compression that will be done. The
+    cryptoapi module allows the user to configure an expected compression ratio.
+   
+    Third, the user can specify an arbitrary limit on the image size, in
+    megabytes. This limit is treated as a soft limit, so that we don't fail the
+    attempt to suspend if we cannot meet this constraint.
+
+    c. Allocate the required memory and storage space.
+
+    Having done the initial freeze, we determine whether the above constraints
+    are met, and seek to allocate the metadata for the image. If the constraints
+    are not met, or we fail to allocate the required space for the metadata, we
+    seek to free the amount of memory that we calculate is needed and try again.
+    We allow up to four iterations of this loop before aborting the cycle. If we
+    do fail, it should only be because of a bug in TuxOnIce's calculations.
+    
+    These steps are merged together in the prepare_image function, found in
+    prepare_image.c. The functions are merged because of the cyclical nature
+    of the problem of calculating how much memory and storage is needed. Since
+    the data structures containing the information about the image must
+    themselves take memory and use storage, the amount of memory and storage
+    required changes as we prepare the image. Since the changes are not large,
+    only one or two iterations will be required to achieve a solution.
+
+    The recursive nature of the algorithm is miminised by keeping user space
+    frozen while preparing the image, and by the fact that our records of which
+    pages are to be saved and which pageset they are saved in use bitmaps (so
+    that changes in number or fragmentation of the pages to be saved don't
+    feedback via changes in the amount of memory needed for metadata). The
+    recursiveness is thus limited to any extra slab pages allocated to store the
+    extents that record storage used, and the effects of seeking to free memory.
+
+    d. Write the image.
+
+    We previously mentioned the need to create an atomic copy of the data, and
+    the half-of-memory limitation that is implied in this. This limitation is
+    circumvented by dividing the memory to be saved into two parts, called
+    pagesets.
+
+    Pageset2 contains the page cache - the pages on the active and inactive
+    lists. These pages aren't needed or modifed while TuxOnIce is running, so
+    they can be safely written without an atomic copy. They are therefore
+    saved first and reloaded last. While saving these pages, TuxOnIce carefully
+    ensures that the work of writing the pages doesn't make the image
+    inconsistent.
+
+    Once pageset2 has been saved, we prepare to do the atomic copy of remaining
+    memory. As part of the preparation, we power down drivers, thereby providing
+    them with the opportunity to have their state recorded in the image. The
+    amount of memory allocated by drivers for this is usually negligible, but if
+    DRI is in use, video drivers may require significants amounts. Ideally we
+    would be able to query drivers while preparing the image as to the amount of
+    memory they will need. Unfortunately no such mechanism exists at the time of
+    writing. For this reason, TuxOnIce allows the user to set an
+    'extra_pages_allowance', which is used to seek to ensure sufficient memory
+    is available for drivers at this point. TuxOnIce also lets the user set this
+    value to 0. In this case, a test driver suspend is done while preparing the
+    image, and the difference (plus a margin) used instead.
+
+    Having suspended the drivers, we save the CPU context before making an
+    atomic copy of pageset1, resuming the drivers and saving the atomic copy.
+    After saving the two pagesets, we just need to save our metadata before
+    powering down.
+
+    As we mentioned earlier, the contents of pageset2 pages aren't needed once
+    they've been saved. We therefore use them as the destination of our atomic
+    copy. In the unlikely event that pageset1 is larger, extra pages are
+    allocated while the image is being prepared. This is normally only a real
+    possibility when the system has just been booted and the page cache is
+    small.
+
+    This is where we need to be careful about syncing, however. Pageset2 will
+    probably contain filesystem meta data. If this is overwritten with pageset1
+    and then a sync occurs, the filesystem will be corrupted - at least until
+    resume time and another sync of the restored data. Since there is a
+    possibility that the user might not resume or (may it never be!) that
+    suspend might oops, we do our utmost to avoid syncing filesystems after
+    copying pageset1.
+
+    e. Power down.
+
+    Powering down uses standard kernel routines. TuxOnIce supports powering down
+    using the ACPI S3, S4 and S5 methods or the kernel's non-ACPI power-off.
+    Supporting suspend to ram (S3) as a power off option might sound strange,
+    but it allows the user to quickly get their system up and running again if
+    the battery doesn't run out (we just need to re-read the overwritten pages)
+    and if the battery does run out (or the user removes power), they can still
+    resume.
+
+4.  Data Structures.
+
+    TuxOnIce uses three main structures to store its metadata and configuration
+    information:
+
+    a) Pageflags bitmaps.
+
+    TuxOnIce records which pages will be in pageset1, pageset2, the destination
+    of the atomic copy and the source of the atomically restored image using
+    bitmaps. These bitmaps are created from order zero allocations to maximise
+    reliability. The individual pages are combined together with pointers to
+    form per-zone bitmaps, which are in turn combined with another layer of
+    pointers to construct the overall bitmap.
+
+    The pageset1 bitmap is thus easily stored in the image header for use at
+    resume time.
+
+    As mentioned above, using bitmaps also means that the amount of memory and
+    storage required for recording the above information is constant. This
+    greatly simplifies the work of preparing the image. In earlier versions of
+    TuxOnIce, extents were used to record which pages would be stored. In that
+    case, however, eating memory could result in greater fragmentation of the
+    lists of pages, which in turn required more memory to store the extents and
+    more storage in the image header. These could in turn require further
+    freeing of memory, and another iteration. All of this complexity is removed
+    by having bitmaps.
+
+    Bitmaps also make a lot of sense because TuxOnIce only ever iterates
+    through the lists. There is therefore no cost to not being able to find the
+    nth page in order 0 time. We only need to worry about the cost of finding
+    the n+1th page, given the location of the nth page. Bitwise optimisations
+    help here.
+
+    The data structure is: unsigned long ***.
+
+    b) Extents for block data.
+
+    TuxOnIce supports writing the image to multiple block devices. In the case
+    of swap, multiple partitions and/or files may be in use, and we happily use
+    them all. This is accomplished as follows:
+
+    Whatever the actual source of the allocated storage, the destination of the
+    image can be viewed in terms of one or more block devices, and on each
+    device, a list of sectors. To simplify matters, we only use contiguous,
+    PAGE_SIZE aligned sectors, like the swap code does.
+
+    Since sector numbers on each bdev may well not start at 0, it makes much
+    more sense to use extents here. Contiguous ranges of pages can thus be
+    represented in the extents by contiguous values.
+
+    Variations in block size are taken account of in transforming this data
+    into the parameters for bio submission.
+
+    We can thus implement a layer of abstraction wherein the core of TuxOnIce
+    doesn't have to worry about which device we're currently writing to or
+    where in the device we are. It simply requests that the next page in the
+    pageset or header be written, leaving the details to this lower layer.
+    The lower layer remembers where in the sequence of devices and blocks each
+    pageset starts. The header always starts at the beginning of the allocated
+    storage.
+
+    So extents are:
+
+    struct extent {
+      unsigned long minimum, maximum;
+      struct extent *next;
+    }
+
+    These are combined into chains of extents for a device:
+
+    struct extent_chain {
+      int size; /* size of the extent ie sum (max-min+1) */
+      int allocs, frees;
+      char *name;
+      struct extent *first, *last_touched;
+    };
+
+    For each bdev, we need to store a little more info:
+
+    struct suspend_bdev_info {
+       struct block_device *bdev;
+       dev_t dev_t;
+       int bmap_shift;
+       int blocks_per_page;
+    };
+
+    The dev_t is used to identify the device in the stored image. As a result,
+    we expect devices at resume time to have the same major and minor numbers
+    as they had while suspending.  This is primarily a concern where the user
+    utilises LVM for storage, as they will need to dmsetup their partitions in
+    such a way as to maintain this consistency at resume time.
+
+    bmap_shift and blocks_per_page record apply the effects of variations in
+    blocks per page settings for the filesystem and underlying bdev. For most
+    filesystems, these are the same, but for xfs, they can have independant
+    values.
+
+    Combining these two structures together, we have everything we need to
+    record what devices and what blocks on each device are being used to
+    store the image, and to submit i/o using bio_submit.
+
+    The last elements in the picture are a means of recording how the storage
+    is being used.
+
+    We do this first and foremost by implementing a layer of abstraction on
+    top of the devices and extent chains which allows us to view however many
+    devices there might be as one long storage tape, with a single 'head' that
+    tracks a 'current position' on the tape:
+
+    struct extent_iterate_state {
+      struct extent_chain *chains;
+      int num_chains;
+      int current_chain;
+      struct extent *current_extent;
+      unsigned long current_offset;
+    };
+
+    That is, *chains points to an array of size num_chains of extent chains.
+    For the filewriter, this is always a single chain. For the swapwriter, the
+    array is of size MAX_SWAPFILES.
+
+    current_chain, current_extent and current_offset thus point to the current
+    index in the chains array (and into a matching array of struct
+    suspend_bdev_info), the current extent in that chain (to optimise access),
+    and the current value in the offset.
+
+    The image is divided into three parts:
+    - The header
+    - Pageset 1
+    - Pageset 2
+
+    The header always starts at the first device and first block. We know its
+    size before we begin to save the image because we carefully account for
+    everything that will be stored in it.
+
+    The second pageset (LRU) is stored first. It begins on the next page after
+    the end of the header.
+
+    The first pageset is stored second. It's start location is only known once
+    pageset2 has been saved, since pageset2 may be compressed as it is written.
+    This location is thus recorded at the end of saving pageset2. It is page
+    aligned also.
+
+    Since this information is needed at resume time, and the location of extents
+    in memory will differ at resume time, this needs to be stored in a portable
+    way:
+
+    struct extent_iterate_saved_state {
+        int chain_num;
+        int extent_num;
+        unsigned long offset;
+    };
+
+    We can thus implement a layer of abstraction wherein the core of TuxOnIce
+    doesn't have to worry about which device we're currently writing to or
+    where in the device we are. It simply requests that the next page in the
+    pageset or header be written, leaving the details to this layer, and
+    invokes the routines to remember and restore the position, without having
+    to worry about the details of how the data is arranged on disk or such like.
+
+    c) Modules
+
+    One aim in designing TuxOnIce was to make it flexible. We wanted to allow
+    for the implementation of different methods of transforming a page to be
+    written to disk and different methods of getting the pages stored.
+
+    In early versions (the betas and perhaps Suspend1), compression support was
+    inlined in the image writing code, and the data structures and code for
+    managing swap were intertwined with the rest of the code. A number of people
+    had expressed interest in implementing image encryption, and alternative
+    methods of storing the image.
+
+    In order to achieve this, TuxOnIce was given a modular design.
+
+    A module is a single file which encapsulates the functionality needed
+    to transform a pageset of data (encryption or compression, for example),
+    or to write the pageset to a device. The former type of module is called
+    a 'page-transformer', the later a 'writer'.
+
+    Modules are linked together in pipeline fashion. There may be zero or more
+    page transformers in a pipeline, and there is always exactly one writer.
+    The pipeline follows this pattern:
+
+               ---------------------------------
+               |          TuxOnIce Core        |
+               ---------------------------------
+                               |
+                               |
+               ---------------------------------
+               |       Page transformer 1      |
+               ---------------------------------
+                               |
+                               |
+               ---------------------------------
+               |       Page transformer 2      |
+               ---------------------------------
+                               |
+                               |
+               ---------------------------------
+               |            Writer             |
+               ---------------------------------
+
+    During the writing of an image, the core code feeds pages one at a time
+    to the first module. This module performs whatever transformations it
+    implements on the incoming data, completely consuming the incoming data and
+    feeding output in a similar manner to the next module. A module may buffer
+    its output.
+
+    All routines are SMP safe, and the final result of the transformations is
+    written with an index (provided by the core) and size of the output by the
+    writer. As a result, we can have multithreaded I/O without needing to
+    worry about the sequence in which pages are written (or read).
+
+    During reading, the pipeline works in the reverse direction. The core code
+    calls the first module with the address of a buffer which should be filled.
+    (Note that the buffer size is always PAGE_SIZE at this time). This module
+    will in turn request data from the next module and so on down until the
+    writer is made to read from the stored image.
+
+    Part of definition of the structure of a module thus looks like this:
+
+        int (*rw_init) (int rw, int stream_number);
+        int (*rw_cleanup) (int rw);
+        int (*write_chunk) (struct page *buffer_page);
+        int (*read_chunk) (struct page *buffer_page, int sync);
+
+    It should be noted that the _cleanup routine may be called before the
+    full stream of data has been read or written. While writing the image,
+    the user may (depending upon settings) choose to abort suspending, and
+    if we are in the midst of writing the last portion of the image, a portion
+    of the second pageset may be reread. This may also happen if an error
+    occurs and we seek to abort the process of writing the image.
+
+    The modular design is also useful in a number of other ways. It provides
+    a means where by we can add support for:
+
+    - providing overall initialisation and cleanup routines;
+    - serialising configuration information in the image header;
+    - providing debugging information to the user;
+    - determining memory and image storage requirements;
+    - dis/enabling components at run-time;
+    - configuring the module (see below);
+
+    ...and routines for writers specific to their work:
+    - Parsing a resume= location;
+    - Determining whether an image exists;
+    - Marking a resume as having been attempted;
+    - Invalidating an image;
+
+    Since some parts of the core - the user interface and storage manager
+    support - have use for some of these functions, they are registered as
+    'miscellaneous' modules as well.
+
+    d) Sysfs data structures.
+
+    This brings us naturally to support for configuring TuxOnIce. We desired to
+    provide a way to make TuxOnIce as flexible and configurable as possible.
+    The user shouldn't have to reboot just because they want to now suspend to
+    a file instead of a partition, for example.
+
+    To accomplish this, TuxOnIce implements a very generic means whereby the
+    core and modules can register new sysfs entries. All TuxOnIce entries use
+    a single _store and _show routine, both of which are found in sysfs.c in
+    the kernel/power directory. These routines handle the most common operations
+    - getting and setting the values of bits, integers, longs, unsigned longs
+    and strings in one place, and allow overrides for customised get and set
+    options as well as side-effect routines for all reads and writes.
+
+    When combined with some simple macros, a new sysfs entry can then be defined
+    in just a couple of lines:
+
+    { TOI_ATTR("progress_granularity", SYSFS_RW),
+      SYSFS_INT(&progress_granularity, 1, 2048)
+    },
+
+    This defines a sysfs entry named "progress_granularity" which is rw and
+    allows the user to access an integer stored at &progress_granularity, giving
+    it a value between 1 and 2048 inclusive.
+
+    Sysfs entries are registered under /sys/power/tuxonice, and entries for
+    modules are located in a subdirectory named after the module.
+
diff --git a/Documentation/power/tuxonice.txt b/Documentation/power/tuxonice.txt
new file mode 100644
index 0000000..d13ce85
--- /dev/null
+++ b/Documentation/power/tuxonice.txt
@@ -0,0 +1,750 @@
+       --- TuxOnIce, version 3.0 ---
+
+1.  What is it?
+2.  Why would you want it?
+3.  What do you need to use it?
+4.  Why not just use the version already in the kernel?
+5.  How do you use it?
+6.  What do all those entries in /sys/power/tuxonice do?
+7.  How do you get support?
+8.  I think I've found a bug. What should I do?
+9.  When will XXX be supported?
+10  How does it work?
+11. Who wrote TuxOnIce?
+
+1. What is it?
+
+   Imagine you're sitting at your computer, working away. For some reason, you
+   need to turn off your computer for a while - perhaps it's time to go home
+   for the day. When you come back to your computer next, you're going to want
+   to carry on where you left off. Now imagine that you could push a button and
+   have your computer store the contents of its memory to disk and power down.
+   Then, when you next start up your computer, it loads that image back into
+   memory and you can carry on from where you were, just as if you'd never
+   turned the computer off. You have far less time to start up, no reopening of
+   applications or finding what directory you put that file in yesterday.
+   That's what TuxOnIce does.
+
+   TuxOnIce has a long heritage. It began life as work by Gabor Kuti, who,
+   with some help from Pavel Machek, got an early version going in 1999. The
+   project was then taken over by Florent Chabaud while still in alpha version
+   numbers. Nigel Cunningham came on the scene when Florent was unable to
+   continue, moving the project into betas, then 1.0, 2.0 and so on up to
+   the present series. During the 2.0 series, the name was contracted to
+   Suspend2 and the website suspend2.net created. Beginning around July 2007,
+   a transition to calling the software TuxOnIce was made, to seek to help
+   make it clear that TuxOnIce is more concerned with hibernation than suspend
+   to ram.
+
+   Pavel Machek's swsusp code, which was merged around 2.5.17 retains the
+   original name, and was essentially a fork of the beta code until Rafael
+   Wysocki came on the scene in 2005 and began to improve it further.
+
+2. Why would you want it?
+
+   Why wouldn't you want it?
+   
+   Being able to save the state of your system and quickly restore it improves
+   your productivity - you get a useful system in far less time than through
+   the normal boot process. You also get to be completely 'green', using zero
+   power, or as close to that as possible (the computer may still provide
+   minimal power to some devices, so they can initiate a power on, but that
+   will be the same amount of power as would be used if you told the computer
+   to shutdown.
+   
+3. What do you need to use it?
+
+   a. Kernel Support.
+
+   i) The TuxOnIce patch.
+   
+   TuxOnIce is part of the Linux Kernel. This version is not part of Linus's
+   2.6 tree at the moment, so you will need to download the kernel source and
+   apply the latest patch. Having done that, enable the appropriate options in
+   make [menu|x]config (under Power Management Options - look for "Enhanced
+   Hibernation"), compile and install your kernel. TuxOnIce works with SMP,
+   Highmem, preemption, fuse filesystems, x86-32, PPC and x86_64.
+
+   TuxOnIce patches are available from http://tuxonice.net.
+
+   ii) Compression support.
+
+   Compression support is implemented via the cryptoapi. You will therefore want
+   to select any Cryptoapi transforms that you want to use on your image from
+   the Cryptoapi menu while configuring your kernel. Part of the TuxOnIce patch
+   adds a new cryptoapi compression called LZF. We recommend the use of this
+   compression method - it is very fast and still achieves good compression.
+
+   You can also tell TuxOnIce to write it's image to an encrypted and/or
+   compressed filesystem/swap partition. In that case, you don't need to do
+   anything special for TuxOnIce when it comes to kernel configuration.
+
+   iii) Configuring other options.
+
+   While you're configuring your kernel, try to configure as much as possible
+   to build as modules. We recommend this because there are a number of drivers
+   that are still in the process of implementing proper power management
+   support. In those cases, the best way to work around their current lack is
+   to build them as modules and remove the modules while hibernating. You might
+   also bug the driver authors to get their support up to speed, or even help!
+
+   b. Storage.
+
+   i) Swap.
+
+   TuxOnIce can store the hibernation image in your swap partition, a swap file or
+   a combination thereof. Whichever combination you choose, you will probably
+   want to create enough swap space to store the largest image you could have,
+   plus the space you'd normally use for swap. A good rule of thumb would be
+   to calculate the amount of swap you'd want without using TuxOnIce, and then
+   add the amount of memory you have. This swapspace can be arranged in any way
+   you'd like. It can be in one partition or file, or spread over a number. The
+   only requirement is that they be active when you start a hibernation cycle.
+   
+   There is one exception to this requirement. TuxOnIce has the ability to turn
+   on one swap file or partition at the start of hibernating and turn it back off
+   at the end. If you want to ensure you have enough memory to store a image
+   when your memory is fully used, you might want to make one swap partition or
+   file for 'normal' use, and another for TuxOnIce to activate & deactivate
+   automatically. (Further details below).
+
+   ii) Normal files.
+
+   TuxOnIce includes a 'file allocator'. The file allocator can store your
+   image in a simple file. Since Linux has the concept of everything being a
+   file, this is more powerful than it initially sounds. If, for example, you
+   were to set up a network block device file, you could hibernate to a network
+   server. This has been tested and works to a point, but nbd itself isn't
+   stateless enough for our purposes.
+
+   Take extra care when setting up the file allocator. If you just type
+   commands without thinking and then try to hibernate, you could cause
+   irreversible corruption on your filesystems! Make sure you have backups.
+
+   Most people will only want to hibernate to a local file. To achieve that, do
+   something along the lines of:
+
+   echo "TuxOnIce" > /hibernation-file
+   dd if=/dev/zero bs=1M count=512 >> hibernation-file
+
+   This will create a 512MB file called /hibernation-file. To get TuxOnIce to use
+   it:
+
+   echo /hibernation-file > /sys/power/tuxonice/file/target
+
+   Then
+
+   cat /sys/power/tuxonice/resume
+
+   Put the results of this into your bootloader's configuration (see also step
+   C, below):
+
+   ---EXAMPLE-ONLY-DON'T-COPY-AND-PASTE---
+   # cat /sys/power/tuxonice/resume
+   file:/dev/hda2:0x1e001
+   
+   In this example, we would edit the append= line of our lilo.conf|menu.lst
+   so that it included:
+
+   resume=file:/dev/hda2:0x1e001
+   ---EXAMPLE-ONLY-DON'T-COPY-AND-PASTE---
+ 
+   For those who are thinking 'Could I make the file sparse?', the answer is
+   'No!'. At the moment, there is no way for TuxOnIce to fill in the holes in
+   a sparse file while hibernating. In the longer term (post merge!), I'd like
+   to change things so that the file could be dynamically resized and have
+   holes filled as needed. Right now, however, that's not possible and not a
+   priority.
+
+   c. Bootloader configuration.
+   
+   Using TuxOnIce also requires that you add an extra parameter to 
+   your lilo.conf or equivalent. Here's an example for a swap partition:
+
+   append="resume=swap:/dev/hda1"
+
+   This would tell TuxOnIce that /dev/hda1 is a swap partition you 
+   have. TuxOnIce will use the swap signature of this partition as a
+   pointer to your data when you hibernate. This means that (in this example)
+   /dev/hda1 doesn't need to be _the_ swap partition where all of your data
+   is actually stored. It just needs to be a swap partition that has a
+   valid signature.
+
+   You don't need to have a swap partition for this purpose. TuxOnIce
+   can also use a swap file, but usage is a little more complex. Having made
+   your swap file, turn it on and do 
+
+   cat /sys/power/tuxonice/swap/headerlocations
+
+   (this assumes you've already compiled your kernel with TuxOnIce
+   support and booted it). The results of the cat command will tell you
+   what you need to put in lilo.conf:
+
+   For swap partitions like /dev/hda1, simply use resume=/dev/hda1.
+   For swapfile `swapfile`, use resume=swap:/dev/hda2:0x242d.
+
+   If the swapfile changes for any reason (it is moved to a different
+   location, it is deleted and recreated, or the filesystem is
+   defragmented) then you will have to check
+   /sys/power/tuxonice/swap/headerlocations for a new resume_block value.
+
+   Once you've compiled and installed the kernel and adjusted your bootloader
+   configuration, you should only need to reboot for the most basic part
+   of TuxOnIce to be ready.
+
+   If you only compile in the swap allocator, or only compile in the file
+   allocator, you don't need to add the "swap:" part of the resume=
+   parameters above. resume=/dev/hda2:0x242d will work just as well. If you
+   have compiled both and your storage is on swap, you can also use this
+   format (the swap allocator is the default allocator).
+
+   When compiling your kernel, one of the options in the 'Power Management
+   Support' menu, just above the 'Enhanced Hibernation (TuxOnIce)' entry is
+   called 'Default resume partition'. This can be used to set a default value
+   for the resume= parameter.
+
+   d. The hibernate script.
+
+   Since the driver model in 2.6 kernels is still being developed, you may need
+   to do more than just configure TuxOnIce. Users of TuxOnIce usually start the
+   process via a script which prepares for the hibernation cycle, tells the
+   kernel to do its stuff and then restore things afterwards. This script might
+   involve:
+
+   - Switching to a text console and back if X doesn't like the video card
+     status on resume.
+   - Un/reloading drivers that don't play well with hibernation.
+  
+   Note that you might not be able to unload some drivers if there are 
+   processes using them. You might have to kill off processes that hold
+   devices open. Hint: if your X server accesses an USB mouse, doing a
+   'chvt' to a text console releases the device and you can unload the
+   module.
+
+   Check out the latest script (available on tuxonice.net).
+
+   e. The userspace user interface.
+
+   TuxOnIce has very limited support for displaying status if you only apply
+   the kernel patch - it can printk messages, but that is all. In addition,
+   some of the functions mentioned in this document (such as cancelling a cycle
+   or performing interactive debugging) are unavailable. To utilise these
+   functions, or simply get a nice display, you need the 'userui' component.
+   Userui comes in three flavours, usplash, fbsplash and text. Text should
+   work on any console. Usplash and fbsplash require the appropriate
+   (distro specific?) support.
+
+   To utilise a userui, TuxOnIce just needs to be told where to find the
+   userspace binary:
+
+   echo "/usr/local/sbin/tuxoniceui_fbsplash" > /sys/power/tuxonice/user_interface/program
+
+   The hibernate script can do this for you, and a default value for this
+   setting can be configured when compiling the kernel. This path is also
+   stored in the image header, so if you have an initrd or initramfs, you can
+   use the userui during the first part of resuming (prior to the atomic
+   restore) by putting the binary in the same path in your initrd/ramfs.
+   Alternatively, you can put it in a different location and do an echo
+   similar to the above prior to the echo > do_resume. The value saved in the
+   image header will then be ignored.
+
+4. Why not just use the version already in the kernel?
+
+   The version in the vanilla kernel has a number of drawbacks. The most
+   serious of these are:
+       - it has a maximum image size of 1/2 total memory;
+       - it doesn't allocate storage until after it has snapshotted memory.
+         This means that you can't be sure hibernating will work until you
+         see it start to write the image;
+       - it does not allow you to press escape to cancel a cycle;
+       - it does not allow you to press escape to cancel resuming;
+       - it does not allow you to automatically swapon a file when
+         starting a cycle;
+       - it does not allow you to use multiple swap partitions or files;
+       - it does not allow you to use ordinary files;
+       - it just invalidates an image and continues to boot if you
+         accidentally boot the wrong kernel after hibernating;
+       - it doesn't support any sort of nice display while hibernating;
+       - it is moving toward requiring that you have an initrd/initramfs
+         to ever have a hope of resuming (uswsusp). While uswsusp will
+         address some of the concerns above, it won't address all of them,
+          and will be more complicated to get set up;
+        - it doesn't have support for suspend-to-both (write a hibernation
+         image, then suspend to ram; I think this is known as ReadySafe
+         under M$).
+
+5. How do you use it?
+
+   A hibernation cycle can be started directly by doing:
+
+       echo > /sys/power/tuxonice/do_hibernate
+
+   In practice, though, you'll probably want to use the hibernate script
+   to unload modules, configure the kernel the way you like it and so on.
+   In that case, you'd do (as root):
+
+       hibernate
+
+   See the hibernate script's man page for more details on the options it
+   takes.
+
+   If you're using the text or splash user interface modules, one feature of
+   TuxOnIce that you might find useful is that you can press Escape at any time
+   during hibernating, and the process will be aborted.
+
+   Due to the way hibernation works, this means you'll have your system back and
+   perfectly usable almost instantly. The only exception is when it's at the
+   very end of writing the image. Then it will need to reload a small (usually
+   4-50MBs, depending upon the image characteristics) portion first.
+
+   Likewise, when resuming, you can press escape and resuming will be aborted.
+   The computer will then powerdown again according to settings at that time for
+   the powerdown method or rebooting.
+
+   You can change the settings for powering down while the image is being
+   written by pressing 'R' to toggle rebooting and 'O' to toggle between
+   suspending to ram and powering down completely).
+   
+   If you run into problems with resuming, adding the "noresume" option to
+   the kernel command line will let you skip the resume step and recover your
+   system. This option shouldn't normally be needed, because TuxOnIce modifies
+   the image header prior to the atomic restore, and will thus prompt you
+   if it detects that you've tried to resume an image before (this flag is
+   removed if you press Escape to cancel a resume, so you won't be prompted
+   then).
+
+   Recent kernels (2.6.24 onwards) add support for resuming from a different
+   kernel to the one that was hibernated (thanks to Rafael for his work on
+   this - I've just embraced and enhanced the support for TuxOnIce). This
+   should further reduce the need for you to use the noresume option.
+
+6. What do all those entries in /sys/power/tuxonice do?
+
+   /sys/power/tuxonice is the directory which contains files you can use to
+   tune and configure TuxOnIce to your liking. The exact contents of
+   the directory will depend upon the version of TuxOnIce you're
+   running and the options you selected at compile time. In the following
+   descriptions, names in brackets refer to compile time options.
+   (Note that they're all dependant upon you having selected CONFIG_TUXONICE
+   in the first place!).
+
+   Since the values of these settings can open potential security risks, the
+   writeable ones are accessible only to the root user. You may want to
+   configure sudo to allow you to invoke your hibernate script as an ordinary
+   user.
+ 
+   - checksum/enabled
+
+   Use cryptoapi hashing routines to verify that Pageset2 pages don't change
+   while we're saving the first part of the image, and to get any pages that
+   do change resaved in the atomic copy. This should normally not be needed,
+   but if you're seeing issues, please enable this. If your issues stop you
+   being able to resume, enable this option, hibernate and cancel the cycle
+   after the atomic copy is done. If the debugging info shows a non-zero
+   number of pages resaved, please report this to Nigel.
+ 
+   - compression/algorithm
+
+   Set the cryptoapi algorithm used for compressing the image.
+
+   - compression/expected_compression
+
+   These values allow you to set an expected compression ratio, which TuxOnice
+   will use in calculating whether it meets constraints on the image size. If
+   this expected compression ratio is not attained, the hibernation cycle will
+   abort, so it is wise to allow some spare. You can see what compression
+   ratio is achieved in the logs after hibernating.
+
+   - debug_info:
+  
+   This file returns information about your configuration that may be helpful
+   in diagnosing problems with hibernating.
+
+   - do_hibernate:
+
+   When anything is written to this file, the kernel side of TuxOnIce will
+   begin to attempt to write an image to disk and power down. You'll normally
+   want to run the hibernate script instead, to get modules unloaded first.
+
+   - do_resume:
+
+   When anything is written to this file TuxOnIce will attempt to read and
+   restore an image. If there is no image, it will return almost immediately.
+   If an image exists, the echo > will never return. Instead, the original
+   kernel context will be restored and the original echo > do_hibernate will
+   return.
+
+   - */enabled
+
+   These option can be used to temporarily disable various parts of TuxOnIce.
+
+   - extra_pages_allowance
+
+   When TuxOnIce does its atomic copy, it calls the driver model suspend
+   and resume methods. If you have DRI enabled with a driver such as fglrx,
+   this can result in the driver allocating a substantial amount of memory
+   for storing its state. Extra_pages_allowance tells TuxOnIce how much
+   extra memory it should ensure is available for those allocations. If
+   your attempts at hibernating end with a message in dmesg indicating that
+   insufficient extra pages were allowed, you need to increase this value.
+
+   - file/target:
+
+   Read this value to get the current setting. Write to it to point TuxOnice
+   at a new storage location for the file allocator. See section 3.b.ii above
+   for details of how to set up the file allocator.
+
+   - freezer_test
+
+   This entry can be used to get TuxOnIce to just test the freezer and prepare
+   an image without actually doing a hibernation cycle. It is useful for
+   diagnosing freezing and image preparation issues.
+
+   - image_exists:
+
+   Can be used in a script to determine whether a valid image exists at the
+   location currently pointed to by resume=. Returns up to three lines.
+   The first is whether an image exists (-1 for unsure, otherwise 0 or 1).
+   If an image eixsts, additional lines will return the machine and version.
+   Echoing anything to this entry removes any current image.
+
+   - image_size_limit:
+
+   The maximum size of hibernation image written to disk, measured in megabytes
+   (1024*1024).
+
+   - last_result:
+
+   The result of the last hibernation cycle, as defined in
+   include/linux/suspend-debug.h with the values SUSPEND_ABORTED to
+   SUSPEND_KEPT_IMAGE. This is a bitmask.
+
+   - log_everything (CONFIG_PM_DEBUG):
+
+   Setting this option results in all messages printed being logged. Normally,
+   only a subset are logged, so as to not slow the process and not clutter the
+   logs. Useful for debugging. It can be toggled during a cycle by pressing
+   'L'.
+
+   - pause_between_steps (CONFIG_PM_DEBUG):
+
+   This option is used during debugging, to make TuxOnIce pause between
+   each step of the process. It is ignored when the nice display is on.
+
+   - powerdown_method:
+
+   Used to select a method by which TuxOnIce should powerdown after writing the
+   image. Currently:
+
+   0: Don't use ACPI to power off.
+   3: Attempt to enter Suspend-to-ram.
+   4: Attempt to enter ACPI S4 mode.
+   5: Attempt to power down via ACPI S5 mode.
+
+   Note that these options are highly dependant upon your hardware & software:
+
+   3: When succesful, your machine suspends to ram instead of powering off.
+      The advantage of using this mode is that it doesn't matter whether your
+      battery has enough charge to make it through to your next resume. If it
+      lasts, you will simply resume from suspend to ram (and the image on disk
+      will be discarded). If the battery runs out, you will resume from disk
+      instead. The disadvantage is that it takes longer than a normal
+      suspend-to-ram to enter the state, since the suspend-to-disk image needs
+      to be written first.
+   4/5: When successful, your machine will be off and comsume (almost) no power.
+      But it might still react to some external events like opening the lid or
+      trafic on  a network or usb device. For the bios, resume is then the same
+      as warm boot, similar to a situation where you used the command `reboot'
+      to reboot your machine. If your machine has problems on warm boot or if
+      you want to protect your machine with the bios password, this is probably
+      not the right choice. Mode 4 may be necessary on some machines where ACPI
+      wake up methods need to be run to properly reinitialise hardware after a
+      hibernation cycle.  
+   0: Switch the machine completely off. The only possible wakeup is the power
+      button. For the bios, resume is then the same as a cold boot, in
+      particular you would  have to provide your bios boot password if your
+      machine uses that feature for booting.
+
+   - progressbar_granularity_limit:
+
+   This option can be used to limit the granularity of the progress bar
+   displayed with a bootsplash screen. The value is the maximum number of
+   steps. That is, 10 will make the progress bar jump in 10% increments.
+
+   - reboot:
+
+   This option causes TuxOnIce to reboot rather than powering down
+   at the end of saving an image. It can be toggled during a cycle by pressing
+   'R'.
+
+   - resume_commandline:
+
+   This entry can be read after resuming to see the commandline that was used
+   when resuming began. You might use this to set up two bootloader entries
+   that are the same apart from the fact that one includes a extra append=
+   argument "at_work=1". You could then grep resume_commandline in your
+   post-resume scripts and configure networking (for example) differently
+   depending upon whether you're at home or work. resume_commandline can be
+   set to arbitrary text if you wish to remove sensitive contents.
+
+   - swap/swapfilename:
+
+   This entry is used to specify the swapfile or partition that
+   TuxOnIce will attempt to swapon/swapoff automatically. Thus, if
+   I normally use /dev/hda1 for swap, and want to use /dev/hda2 for specifically
+   for my hibernation image, I would
+  
+   echo /dev/hda2 > /sys/power/tuxonice/swap/swapfile
+
+   /dev/hda2 would then be automatically swapon'd and swapoff'd. Note that the
+   swapon and swapoff occur while other processes are frozen (including kswapd)
+   so this swap file will not be used up when attempting to free memory. The
+   parition/file is also given the highest priority, so other swapfiles/partitions
+   will only be used to save the image when this one is filled.
+
+   The value of this file is used by headerlocations along with any currently
+   activated swapfiles/partitions.
+
+   - swap/headerlocations:
+
+   This option tells you the resume= options to use for swap devices you
+   currently have activated. It is particularly useful when you only want to
+   use a swap file to store your image. See above for further details.
+
+   - userui_program
+
+   This entry is used to tell TuxOnice what userspace program to use for
+   providing a user interface while hibernating. The program uses a netlink
+   socket to pass messages back and forward to the kernel, allowing all of the
+   functions formerly implemented in the kernel user interface components.
+
+   - user_interface/debug_sections (CONFIG_PM_DEBUG):
+
+   This value, together with the console log level, controls what debugging
+   information is displayed. The console log level determines the level of
+   detail, and this value determines what detail is displayed. This value is
+   a bit vector, and the meaning of the bits can be found in the kernel tree
+   in include/linux/tuxonice.h. It can be overridden using the kernel's
+   command line option suspend_dbg.
+
+   - user_interface/default_console_level (CONFIG_PM_DEBUG):
+
+   This determines the value of the console log level at the start of a
+   hibernation cycle. If debugging is compiled in, the console log level can be
+   changed during a cycle by pressing the digit keys. Meanings are:
+
+   0: Nice display.
+   1: Nice display plus numerical progress.
+   2: Errors only.
+   3: Low level debugging info.
+   4: Medium level debugging info.
+   5: High level debugging info.
+   6: Verbose debugging info.
+
+   - user_interface/enable_escape:
+
+   Setting this to "1" will enable you abort a hibernation cycle or resuming by
+   pressing escape, "0" (default) disables this feature. Note that enabling
+   this option means that you cannot initiate a hibernation cycle and then walk
+away
+   from your computer, expecting it to be secure. With feature disabled,
+   you can validly have this expectation once TuxOnice begins to write the
+   image to disk. (Prior to this point, it is possible that TuxOnice might
+   about because of failure to freeze all processes or because constraints
+   on its ability to save the image are not met).
+
+   - version:
+  
+   The version of TuxOnIce you have compiled into the currently running kernel.
+
+7. How do you get support?
+
+   Glad you asked. TuxOnIce is being actively maintained and supported
+   by Nigel (the guy doing most of the kernel coding at the moment), Bernard
+   (who maintains the hibernate script and userspace user interface components)
+   and its users.
+
+   Resources availble include HowTos, FAQs and a Wiki, all available via
+   tuxonice.net.  You can find the mailing lists there.
+
+8. I think I've found a bug. What should I do?
+
+   By far and a way, the most common problems people have with TuxOnIce
+   related to drivers not having adequate power management support. In this
+   case, it is not a bug with TuxOnIce, but we can still help you. As we
+   mentioned above, such issues can usually be worked around by building the
+   functionality as modules and unloading them while hibernating. Please visit
+   the Wiki for up-to-date lists of known issues and work arounds.
+
+   If this information doesn't help, try running:
+
+   hibernate --bug-report
+
+   ..and sending the output to the users mailing list.
+
+   Good information on how to provide us with useful information from an
+   oops is found in the file REPORTING-BUGS, in the top level directory
+   of the kernel tree. If you get an oops, please especially note the
+   information about running what is printed on the screen through ksymoops.
+   The raw information is useless.
+
+9. When will XXX be supported?
+
+   If there's a feature missing from TuxOnIce that you'd like, feel free to
+   ask. We try to be obliging, within reason.
+
+   Patches are welcome. Please send to the list.
+
+10. How does it work?
+
+   TuxOnIce does its work in a number of steps.
+
+   a. Freezing system activity.
+
+   The first main stage in hibernating is to stop all other activity. This is
+   achieved in stages. Processes are considered in fours groups, which we will
+   describe in reverse order for clarity's sake: Threads with the PF_NOFREEZE
+   flag, kernel threads without this flag, userspace processes with the
+   PF_SYNCTHREAD flag and all other processes. The first set (PF_NOFREEZE) are
+   untouched by the refrigerator code. They are allowed to run during hibernating
+   and resuming, and are used to support user interaction, storage access or the
+   like. Other kernel threads (those unneeded while hibernating) are frozen last.
+   This leaves us with userspace processes that need to be frozen. When a
+   process enters one of the *_sync system calls, we set a PF_SYNCTHREAD flag on
+   that process for the duration of that call. Processes that have this flag are
+   frozen after processes without it, so that we can seek to ensure that dirty
+   data is synced to disk as quickly as possible in a situation where other
+   processes may be submitting writes at the same time. Freezing the processes
+   that are submitting data stops new I/O from being submitted. Syncthreads can
+   then cleanly finish their work. So the order is:
+
+   - Userspace processes without PF_SYNCTHREAD or PF_NOFREEZE;
+   - Userspace processes with PF_SYNCTHREAD (they won't have NOFREEZE);
+   - Kernel processes without PF_NOFREEZE.
+
+   b. Eating memory.
+
+   For a successful hibernation cycle, you need to have enough disk space to store the
+   image and enough memory for the various limitations of TuxOnIce's
+   algorithm. You can also specify a maximum image size. In order to attain
+   to those constraints, TuxOnIce may 'eat' memory. If, after freezing
+   processes, the constraints aren't met, TuxOnIce will thaw all the
+   other processes and begin to eat memory until its calculations indicate
+   the constraints are met. It will then freeze processes again and recheck
+   its calculations.
+
+   c. Allocation of storage.
+
+   Next, TuxOnIce allocates the storage that will be used to save
+   the image.
+
+   The core of TuxOnIce knows nothing about how or where pages are stored. We
+   therefore request the active allocator (remember you might have compiled in
+   more than one!) to allocate enough storage for our expect image size. If
+   this request cannot be fulfilled, we eat more memory and try again. If it
+   is fulfiled, we seek to allocate additional storage, just in case our
+   expected compression ratio (if any) isn't achieved. This time, however, we
+   just continue if we can't allocate enough storage.
+
+   If these calls to our allocator change the characteristics of the image
+   such that we haven't allocated enough memory, we also loop. (The allocator
+   may well need to allocate space for its storage information).
+
+   d. Write the first part of the image.
+
+   TuxOnIce stores the image in two sets of pages called 'pagesets'.
+   Pageset 2 contains pages on the active and inactive lists; essentially
+   the page cache. Pageset 1 contains all other pages, including the kernel.
+   We use two pagesets for one important reason: We need to make an atomic copy
+   of the kernel to ensure consistency of the image. Without a second pageset,
+   that would limit us to an image that was at most half the amount of memory
+   available. Using two pagesets allows us to store a full image. Since pageset
+   2 pages won't be needed in saving pageset 1, we first save pageset 2 pages.
+   We can then make our atomic copy of the remaining pages using both pageset 2
+   pages and any other pages that are free. While saving both pagesets, we are
+   careful not to corrupt the image. Among other things, we use lowlevel block
+   I/O routines that don't change the pagecache contents.
+
+   The next step, then, is writing pageset 2.
+
+   e. Suspending drivers and storing processor context.
+
+   Having written pageset2, TuxOnIce calls the power management functions to
+   notify drivers of the hibernation, and saves the processor state in preparation
+   for the atomic copy of memory we are about to make.
+
+   f. Atomic copy.
+
+   At this stage, everything else but the TuxOnIce code is halted. Processes
+   are frozen or idling, drivers are quiesced and have stored (ideally and where
+   necessary) their configuration in memory we are about to atomically copy.
+   In our lowlevel architecture specific code, we have saved the CPU state.
+   We can therefore now do our atomic copy before resuming drivers etc.
+
+   g. Save the atomic copy (pageset 1).
+
+   TuxOnice can then write the atomic copy of the remaining pages. Since we
+   have copied the pages into other locations, we can continue to use the
+   normal block I/O routines without fear of corruption our image.
+
+   f. Save the image header.
+
+   Nearly there! We save our settings and other parameters needed for
+   reloading pageset 1 in an 'image header'. We also tell our allocator to
+   serialise its data at this stage, so that it can reread the image at resume
+   time.
+
+   g. Set the image header.
+
+   Finally, we edit the header at our resume= location. The signature is
+   changed by the allocator to reflect the fact that an image exists, and to
+   point to the start of that data if necessary (swap allocator).
+
+   h. Power down.
+
+   Or reboot if we're debugging and the appropriate option is selected.
+
+   Whew!
+
+   Reloading the image.
+   --------------------
+
+   Reloading the image is essentially the reverse of all the above. We load
+   our copy of pageset 1, being careful to choose locations that aren't going
+   to be overwritten as we copy it back (We start very early in the boot
+   process, so there are no other processes to quiesce here). We then copy
+   pageset 1 back to its original location in memory and restore the process
+   context. We are now running with the original kernel. Next, we reload the
+   pageset 2 pages, free the memory and swap used by TuxOnIce, restore
+   the pageset header and restart processes. Sounds easy in comparison to
+   hibernating, doesn't it!
+
+   There is of course more to TuxOnIce than this, but this explanation
+   should be a good start. If there's interest, I'll write further
+   documentation on range pages and the low level I/O.
+
+11. Who wrote TuxOnIce?
+
+   (Answer based on the writings of Florent Chabaud, credits in files and
+   Nigel's limited knowledge; apologies to anyone missed out!)
+
+   The main developers of TuxOnIce have been...
+
+   Gabor Kuti
+   Pavel Machek
+   Florent Chabaud
+   Bernard Blackham
+   Nigel Cunningham
+
+   Significant portions of swsusp, the code in the vanilla kernel which
+   TuxOnIce enhances, have been worked on by Rafael Wysocki. Thanks should
+   also be expressed to him.
+
+   The above mentioned developers have been aided in their efforts by a host
+   of hundreds, if not thousands of testers and people who have submitted bug
+   fixes & suggestions. Of special note are the efforts of Michael Frank, who
+   had his computers repetitively hibernate and resume for literally tens of
+   thousands of cycles and developed scripts to stress the system and test
+   TuxOnIce far beyond the point most of us (Nigel included!) would consider
+   testing. His efforts have contributed as much to TuxOnIce as any of the
+   names above.
diff --git a/MAINTAINERS b/MAINTAINERS
index 3596d17..3e7e5ce 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4100,6 +4100,13 @@ P:       Maciej W. Rozycki
 M:     macro@linux-mips.org
 S:     Maintained
 
+TUXONICE (ENHANCED HIBERNATION)
+P:     Nigel Cunningham
+M:     nigel@tuxonice.net
+L:     suspend2-devel@tuxonice.net
+W:     http://tuxonice.net
+S:     Maintained
+
 U14-34F SCSI DRIVER
 P:     Dario Ballabio
 M:     ballabio_dario@emc.com
diff --git a/crypto/Kconfig b/crypto/Kconfig
index d831859..59dbd07 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -666,6 +666,14 @@ config CRYPTO_LZO
        help
          This is the LZO algorithm.
 
+config CRYPTO_LZF
+       tristate "LZF compression algorithm"
+       default y
+       select CRYPTO_ALGAPI
+       help
+         This is the LZF algorithm. It is especially useful for TuxOnIce,
+         because it achieves good compression quickly.
+
 source "drivers/crypto/Kconfig"
 
 endif  # if CRYPTO
diff --git a/crypto/Makefile b/crypto/Makefile
index d4f3ed8..fe05a9e 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -67,6 +67,7 @@ obj-$(CONFIG_CRYPTO_SALSA20) += salsa20_generic.o
 obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
 obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
 obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
+obj-$(CONFIG_CRYPTO_LZF) += lzf.o
 obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o
 obj-$(CONFIG_CRYPTO_LZO) += lzo.o
 
diff --git a/crypto/lzf.c b/crypto/lzf.c
new file mode 100644
index 0000000..3e0aa8c
--- /dev/null
+++ b/crypto/lzf.c
@@ -0,0 +1,326 @@
+/*
+ * Cryptoapi LZF compression module.
+ *
+ * Copyright (c) 2004-2005 Nigel Cunningham <nigel at tuxonice net>
+ *
+ * based on the deflate.c file:
+ *
+ * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
+ *
+ * and upon the LZF compression module donated to the TuxOnIce project with
+ * the following copyright:
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ * Copyright (c) 2000-2003 Marc Alexander Lehmann <pcg@goof.com>
+ *
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, are permitted provided that the following conditions are met:
+ *
+ *   1.  Redistributions of source code must retain the above copyright notice,
+ *       this list of conditions and the following disclaimer.
+ *
+ *   2.  Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *
+ *   3.  The name of the author may not be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
+ * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
+ * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
+ * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License version 2 (the "GPL"), in which case the
+ * provisions of the GPL are applicable instead of the above. If you wish to
+ * allow the use of your version of this file only under the terms of the
+ * GPL and not to allow others to use your version of this file under the
+ * BSD license, indicate your decision by deleting the provisions above and
+ * replace them with the notice and other provisions required by the GPL. If
+ * you do not delete the provisions above, a recipient may use your version
+ * of this file under either the BSD or the GPL.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/crypto.h>
+#include <linux/err.h>
+#include <linux/vmalloc.h>
+#include <asm/string.h>
+
+struct lzf_ctx {
+       void *hbuf;
+       unsigned int bufofs;
+};
+
+/*
+ * size of hashtable is (1 << hlog) * sizeof (char *)
+ * decompression is independent of the hash table size
+ * the difference between 15 and 14 is very small
+ * for small blocks (and 14 is also faster).
+ * For a low-memory configuration, use hlog == 13;
+ * For best compression, use 15 or 16.
+ */
+static const int hlog = 13;
+
+/*
+ * don't play with this unless you benchmark!
+ * decompression is not dependent on the hash function
+ * the hashing function might seem strange, just believe me
+ * it works ;)
+ */
+static inline u16 first(const u8 *p)
+{
+       return ((p[0]) << 8) + p[1];
+}
+
+static inline u16 next(u8 v, const u8 *p)
+{
+       return ((v) << 8) + p[2];
+}
+
+static inline u32 idx(unsigned int h)
+{
+       return (((h ^ (h << 5)) >> (3*8 - hlog)) + h*3) & ((1 << hlog) - 1);
+}
+
+/*
+ * IDX works because it is very similar to a multiplicative hash, e.g.
+ * (h * 57321 >> (3*8 - hlog))
+ * the next one is also quite good, albeit slow ;)
+ * (int)(cos(h & 0xffffff) * 1e6)
+ */
+
+static const int max_lit = (1 <<  5);
+static const int max_off = (1 << 13);
+static const int max_ref = ((1 <<  8) + (1 << 3));
+
+/*
+ * compressed format
+ *
+ * 000LLLLL <L+1>    ; literal
+ * LLLOOOOO oooooooo ; backref L
+ * 111OOOOO LLLLLLLL oooooooo ; backref L+7
+ *
+ */
+
+static void lzf_compress_exit(struct crypto_tfm *tfm)
+{
+       struct lzf_ctx *ctx = crypto_tfm_ctx(tfm);
+
+       if (!ctx->hbuf)
+               return;
+
+       vfree(ctx->hbuf);
+       ctx->hbuf = NULL;
+}
+
+static int lzf_compress_init(struct crypto_tfm *tfm)
+{
+       struct lzf_ctx *ctx = crypto_tfm_ctx(tfm);
+
+       /* Get LZF ready to go */
+       ctx->hbuf = vmalloc_32((1 << hlog) * sizeof(char *));
+       if (ctx->hbuf)
+               return 0;
+
+       printk(KERN_WARNING "Failed to allocate %ld bytes for lzf workspace\n",
+                       (long) ((1 << hlog) * sizeof(char *)));
+       return -ENOMEM;
+}
+
+static int lzf_compress(struct crypto_tfm *tfm, const u8 *in_data,
+               unsigned int in_len, u8 *out_data, unsigned int *out_len)
+{
+       struct lzf_ctx *ctx = crypto_tfm_ctx(tfm);
+       const u8 **htab = ctx->hbuf;
+       const u8 **hslot;
+       const u8 *ip = in_data;
+       u8 *op = out_data;
+       const u8 *in_end = ip + in_len;
+       u8 *out_end = op + *out_len - 3;
+       const u8 *ref;
+
+       unsigned int hval = first(ip);
+       unsigned long off;
+       int lit = 0;
+
+       memset(htab, 0, sizeof(htab));
+
+       for (;;) {
+               if (ip < in_end - 2) {
+                       hval = next(hval, ip);
+                       hslot = htab + idx(hval);
+                       ref = *hslot;
+                       *hslot = ip;
+
+                       off = ip - ref - 1;
+                       if (off < max_off
+                           && ip + 4 < in_end && ref > in_data
+                           && *(u16 *) ref == *(u16 *) ip && ref[2] == ip[2]
+                           ) {
+                               /* match found at *ref++ */
+                               unsigned int len = 2;
+                               unsigned int maxlen = in_end - ip - len;
+                               maxlen = maxlen > max_ref ? max_ref : maxlen;
+
+                               do
+                                       len++;
+                               while (len < maxlen && ref[len] == ip[len]);
+
+                               if (op + lit + 1 + 3 >= out_end) {
+                                       *out_len = PAGE_SIZE;
+                                       return 0;
+                               }
+
+                               if (lit) {
+                                       *op++ = lit - 1;
+                                       lit = -lit;
+                                       do {
+                                               *op++ = ip[lit];
+                                       } while (++lit);
+                               }
+
+                               len -= 2;
+                               ip++;
+
+                               if (len < 7) {
+                                       *op++ = (off >> 8) + (len << 5);
+                               } else {
+                                       *op++ = (off >> 8) + (7 << 5);
+                                       *op++ = len - 7;
+                               }
+
+                               *op++ = off;
+
+                               ip += len;
+                               hval = first(ip);
+                               hval = next(hval, ip);
+                               htab[idx(hval)] = ip;
+                               ip++;
+                               continue;
+                       }
+               } else if (ip == in_end)
+                       break;
+
+               /* one more literal byte we must copy */
+               lit++;
+               ip++;
+
+               if (lit == max_lit) {
+                       if (op + 1 + max_lit >= out_end) {
+                               *out_len = PAGE_SIZE;
+                               return 0;
+                       }
+
+                       *op++ = max_lit - 1;
+                       memcpy(op, ip - max_lit, max_lit);
+                       op += max_lit;
+                       lit = 0;
+               }
+       }
+
+       if (lit) {
+               if (op + lit + 1 >= out_end) {
+                       *out_len = PAGE_SIZE;
+                       return 0;
+               }
+
+               *op++ = lit - 1;
+               lit = -lit;
+               do {
+                       *op++ = ip[lit];
+               } while (++lit);
+       }
+
+       *out_len = op - out_data;
+       return 0;
+}
+
+static int lzf_decompress(struct crypto_tfm *tfm, const u8 *src,
+               unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+       u8 const *ip = src;
+       u8 *op = dst;
+       u8 const *const in_end = ip + slen;
+       u8 *const out_end = op + *dlen;
+
+       *dlen = PAGE_SIZE;
+       do {
+               unsigned int ctrl = *ip++;
+
+               if (ctrl < (1 << 5)) {
+                       /* literal run */
+                       ctrl++;
+
+                       if (op + ctrl > out_end)
+                               return 0;
+                       memcpy(op, ip, ctrl);
+                       op += ctrl;
+                       ip += ctrl;
+               } else {        /* back reference */
+
+                       unsigned int len = ctrl >> 5;
+
+                       u8 *ref = op - ((ctrl & 0x1f) << 8) - 1;
+
+                       if (len == 7)
+                               len += *ip++;
+
+                       ref -= *ip++;
+                       len += 2;
+
+                       if (op + len > out_end || ref < (u8 *) dst)
+                               return 0;
+
+                       do {
+                               *op++ = *ref++;
+                       } while (--len);
+               }
+       } while (op < out_end && ip < in_end);
+
+       *dlen = op - (u8 *) dst;
+       return 0;
+}
+
+static struct crypto_alg alg = {
+       .cra_name = "lzf",
+       .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
+       .cra_ctxsize = sizeof(struct lzf_ctx),
+       .cra_module = THIS_MODULE,
+       .cra_list = LIST_HEAD_INIT(alg.cra_list),
+       .cra_init = lzf_compress_init,
+       .cra_exit = lzf_compress_exit,
+       .cra_u = { .compress = {
+       .coa_compress = lzf_compress,
+       .coa_decompress = lzf_decompress } }
+};
+
+static int __init init(void)
+{
+       return crypto_register_alg(&alg);
+}
+
+static void __exit fini(void)
+{
+       crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("LZF Compression Algorithm");
+MODULE_AUTHOR("Marc Alexander Lehmann & Nigel Cunningham");
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 273a944..37c1e9f 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -54,6 +54,7 @@ void device_pm_lock(void)
 {
        mutex_lock(&dpm_list_mtx);
 }
+EXPORT_SYMBOL(device_pm_lock);
 
 /**
  *     device_pm_unlock - unlock the list of active devices used by the PM core
@@ -62,6 +63,7 @@ void device_pm_unlock(void)
 {
        mutex_unlock(&dpm_list_mtx);
 }
+EXPORT_SYMBOL(device_pm_unlock);
 
 /**
  *     device_pm_add - add a device to the list of active devices
diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index d524dc2..681972e 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -40,7 +40,6 @@
 #include <linux/interrupt.h>
 #include <linux/device.h>
 #include <linux/sysdev.h>
-#include <linux/freezer.h>
 #include <linux/syscalls.h>
 #include <linux/suspend.h>
 #include <linux/cpu.h>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index deeac4b..cbf1e49 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5899,6 +5899,8 @@ void md_do_sync(mddev_t *mddev)
                        last_mark = next;
                }
 
+               while (freezer_is_on())
+                       yield();
 
                if (kthread_should_stop())
                        goto interrupted;
diff --git a/fs/buffer.c b/fs/buffer.c
index ac78d4c..3a927e2 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -247,6 +247,91 @@ void thaw_bdev(struct block_device *bdev, struct super_block *sb)
 }
 EXPORT_SYMBOL(thaw_bdev);
 
+#if 0
+#define FS_PRINTK(fmt, args...) printk(fmt, ## args)
+#else
+#define FS_PRINTK(fmt, args...)
+#endif
+
+/* #define DEBUG_FS_FREEZING */
+
+/**
+ * freeze_filesystems - lock all filesystems and force them into a consistent
+ * state
+ */
+void freeze_filesystems(int which)
+{
+       struct super_block *sb;
+
+       lockdep_off();
+
+       /*
+        * Freeze in reverse order so filesystems dependant upon others are
+        * frozen in the right order (eg. loopback on ext3).
+        */
+       list_for_each_entry_reverse(sb, &super_blocks, s_list) {
+               FS_PRINTK(KERN_INFO "Considering %s.%s: (root %p, bdev %x)",
+                       sb->s_type->name ? sb->s_type->name : "?",
+                       sb->s_subtype ? sb->s_subtype : "", sb->s_root,
+                       sb->s_bdev ? sb->s_bdev->bd_dev : 0);
+
+               if (sb->s_type->fs_flags & FS_IS_FUSE &&
+                   sb->s_frozen == SB_UNFROZEN &&
+                   which & FS_FREEZER_FUSE) {
+                       sb->s_frozen = SB_FREEZE_TRANS;
+                       sb->s_flags |= MS_FROZEN;
+                       printk("Fuse filesystem done.\n");
+                       continue;
+               }
+
+               if (!sb->s_root || !sb->s_bdev ||
+                   (sb->s_frozen == SB_FREEZE_TRANS) ||
+                   (sb->s_flags & MS_RDONLY) ||
+                   (sb->s_flags & MS_FROZEN) ||
+                   !(which & FS_FREEZER_NORMAL)) {
+                       FS_PRINTK(KERN_INFO "Nope.\n");
+                       continue;
+               }
+
+               FS_PRINTK(KERN_INFO "Freezing %x... ", sb->s_bdev->bd_dev);
+               freeze_bdev(sb->s_bdev);
+               sb->s_flags |= MS_FROZEN;
+               FS_PRINTK(KERN_INFO "Done.\n");
+       }
+
+       lockdep_on();
+}
+
+/**
+ * thaw_filesystems - unlock all filesystems
+ */
+void thaw_filesystems(int which)
+{
+       struct super_block *sb;
+
+       lockdep_off();
+
+       list_for_each_entry(sb, &super_blocks, s_list) {
+               if (!(sb->s_flags & MS_FROZEN))
+                       continue;
+
+               if (sb->s_type->fs_flags & FS_IS_FUSE) {
+                       if (!(which & FS_FREEZER_FUSE))
+                               continue;
+
+                       sb->s_frozen = SB_UNFROZEN;
+               } else {
+                       if (!(which & FS_FREEZER_NORMAL))
+                               continue;
+
+                       thaw_bdev(sb->s_bdev, sb);
+               }
+               sb->s_flags &= ~MS_FROZEN;
+       }
+
+       lockdep_on();
+}
+
 /*
  * Various filesystems appear to want __find_get_block to be non-blocking.
  * But it's the page lock which protects the buffers.  To get around this,
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 3e5637f..0d4c88e 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -33,7 +33,7 @@ static void drop_pagecache_sb(struct super_block *sb)
        iput(toput_inode);
 }
 
-static void drop_pagecache(void)
+void drop_pagecache(void)
 {
        struct super_block *sb;
 
diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index 4f3cab3..f15b0c5 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -207,6 +207,7 @@ static void fuse_ctl_kill_sb(struct super_block *sb)
 static struct file_system_type fuse_ctl_fs_type = {
        .owner          = THIS_MODULE,
        .name           = "fusectl",
+       .fs_flags       = FS_IS_FUSE,
        .get_sb         = fuse_ctl_get_sb,
        .kill_sb        = fuse_ctl_kill_sb,
 };
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 87250b6..7246e3d 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -7,6 +7,7 @@
 */
 
 #include "fuse_i.h"
+#include "fuse.h"
 
 #include <linux/init.h>
 #include <linux/module.h>
@@ -16,6 +17,7 @@
 #include <linux/pagemap.h>
 #include <linux/file.h>
 #include <linux/slab.h>
+#include <linux/freezer.h>
 
 MODULE_ALIAS_MISCDEV(FUSE_MINOR);
 
@@ -743,6 +745,8 @@ static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov,
        if (!fc)
                return -EPERM;
 
+       FUSE_MIGHT_FREEZE(file->f_mapping->host->i_sb, "fuse_dev_read");
+
  restart:
        spin_lock(&fc->lock);
        err = -EAGAIN;
@@ -869,6 +873,9 @@ static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
        if (!fc)
                return -EPERM;
 
+       FUSE_MIGHT_FREEZE(iocb->ki_filp->f_mapping->host->i_sb,
+                       "fuse_dev_write");
+
        fuse_copy_init(&cs, fc, 0, NULL, iov, nr_segs);
        if (nbytes < sizeof(struct fuse_out_header))
                return -EINVAL;
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index fd03330..347e054 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -7,12 +7,14 @@
 */
 
 #include "fuse_i.h"
+#include "fuse.h"
 
 #include <linux/pagemap.h>
 #include <linux/file.h>
 #include <linux/gfp.h>
 #include <linux/sched.h>
 #include <linux/namei.h>
+#include <linux/freezer.h>
 
 #if BITS_PER_LONG >= 64
 static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
@@ -174,6 +176,9 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
                        return 0;
 
                fc = get_fuse_conn(inode);
+
+               FUSE_MIGHT_FREEZE(inode->i_sb, "fuse_dentry_revalidate");
+
                req = fuse_get_req(fc);
                if (IS_ERR(req))
                        return 0;
@@ -273,6 +278,8 @@ int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
        if (IS_ERR(req))
                goto out;
 
+       FUSE_MIGHT_FREEZE(sb, "fuse_lookup");
+
        forget_req = fuse_get_req(fc);
        err = PTR_ERR(forget_req);
        if (IS_ERR(forget_req)) {
@@ -402,6 +409,8 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
        if (IS_ERR(forget_req))
                return PTR_ERR(forget_req);
 
+       FUSE_MIGHT_FREEZE(dir->i_sb, "fuse_create_open");
+
        req = fuse_get_req(fc);
        err = PTR_ERR(req);
        if (IS_ERR(req))
@@ -488,6 +497,8 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
        int err;
        struct fuse_req *forget_req;
 
+       FUSE_MIGHT_FREEZE(dir->i_sb, "create_new_entry");
+
        forget_req = fuse_get_req(fc);
        if (IS_ERR(forget_req)) {
                fuse_put_request(fc, req);
@@ -585,7 +596,11 @@ static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode)
 {
        struct fuse_mkdir_in inarg;
        struct fuse_conn *fc = get_fuse_conn(dir);
-       struct fuse_req *req = fuse_get_req(fc);
+       struct fuse_req *req;
+
+       FUSE_MIGHT_FREEZE(dir->i_sb, "fuse_mkdir");
+
+       req = fuse_get_req(fc);
        if (IS_ERR(req))
                return PTR_ERR(req);
 
@@ -605,7 +620,11 @@ static int fuse_symlink(struct inode *dir, struct dentry *entry,
 {
        struct fuse_conn *fc = get_fuse_conn(dir);
        unsigned len = strlen(link) + 1;
-       struct fuse_req *req = fuse_get_req(fc);
+       struct fuse_req *req;
+
+       FUSE_MIGHT_FREEZE(dir->i_sb, "fuse_symlink");
+
+       req = fuse_get_req(fc);
        if (IS_ERR(req))
                return PTR_ERR(req);
 
@@ -622,7 +641,11 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry)
 {
        int err;
        struct fuse_conn *fc = get_fuse_conn(dir);
-       struct fuse_req *req = fuse_get_req(fc);
+       struct fuse_req *req;
+
+       FUSE_MIGHT_FREEZE(dir->i_sb, "fuse_unlink");
+
+       req = fuse_get_req(fc);
        if (IS_ERR(req))
                return PTR_ERR(req);
 
@@ -653,7 +676,11 @@ static int fuse_rmdir(struct inode *dir, struct dentry *entry)
 {
        int err;
        struct fuse_conn *fc = get_fuse_conn(dir);
-       struct fuse_req *req = fuse_get_req(fc);
+       struct fuse_req *req;
+
+       FUSE_MIGHT_FREEZE(dir->i_sb, "fuse_rmdir");
+
+       req = fuse_get_req(fc);
        if (IS_ERR(req))
                return PTR_ERR(req);
 
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 2bada6b..2e4af49 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -7,11 +7,13 @@
 */
 
 #include "fuse_i.h"
+#include "fuse.h"
 
 #include <linux/pagemap.h>
 #include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
+#include <linux/freezer.h>
 
 static const struct file_operations fuse_direct_io_file_operations;
 
@@ -23,6 +25,8 @@ static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
        struct fuse_req *req;
        int err;
 
+       FUSE_MIGHT_FREEZE(inode->i_sb, "fuse_send_open");
+
        req = fuse_get_req(fc);
        if (IS_ERR(req))
                return PTR_ERR(req);
@@ -674,6 +678,8 @@ static int fuse_buffered_write(struct file *file, struct inode *inode,
        if (is_bad_inode(inode))
                return -EIO;
 
+       FUSE_MIGHT_FREEZE(inode->i_sb, "fuse_commit_write");
+
        /*
         * Make sure writepages on the same page are not mixed up with
         * plain writes.
@@ -962,6 +968,8 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
        if (is_bad_inode(inode))
                return -EIO;
 
+       FUSE_MIGHT_FREEZE(file->f_mapping->host->i_sb, "fuse_direct_io");
+
        req = fuse_get_req(fc);
        if (IS_ERR(req))
                return PTR_ERR(req);
@@ -1315,6 +1323,8 @@ static int fuse_getlk(struct file *file, struct file_lock *fl)
        struct fuse_lk_out outarg;
        int err;
 
+       FUSE_MIGHT_FREEZE(file->f_mapping->host->i_sb, "fuse_getlk");
+
        req = fuse_get_req(fc);
        if (IS_ERR(req))
                return PTR_ERR(req);
@@ -1350,6 +1360,8 @@ static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
        if (fl->fl_flags & FL_CLOSE)
                return 0;
 
+       FUSE_MIGHT_FREEZE(file->f_mapping->host->i_sb, "fuse_setlk");
+
        req = fuse_get_req(fc);
        if (IS_ERR(req))
                return PTR_ERR(req);
@@ -1416,6 +1428,8 @@ static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
        if (!inode->i_sb->s_bdev || fc->no_bmap)
                return 0;
 
+       FUSE_MIGHT_FREEZE(inode->i_sb, "fuse_bmap");
+
        req = fuse_get_req(fc);
        if (IS_ERR(req))
                return 0;
diff --git a/fs/fuse/fuse.h b/fs/fuse/fuse.h
new file mode 100644
index 0000000..170e49a
--- /dev/null
+++ b/fs/fuse/fuse.h
@@ -0,0 +1,13 @@
+#define FUSE_MIGHT_FREEZE(superblock, desc) \
+do { \
+       int printed = 0; \
+       while (superblock->s_frozen != SB_UNFROZEN) { \
+               if (!printed) { \
+                       printk(KERN_INFO "%d frozen in " desc ".\n", \
+                                               current->pid); \
+                       printed = 1; \
+               } \
+               try_to_freeze(); \
+               yield(); \
+       } \
+} while (0)
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index d2249f1..04ae6cb 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -914,7 +914,7 @@ static int fuse_get_sb(struct file_system_type *fs_type,
 static struct file_system_type fuse_fs_type = {
        .owner          = THIS_MODULE,
        .name           = "fuse",
-       .fs_flags       = FS_HAS_SUBTYPE,
+       .fs_flags       = FS_HAS_SUBTYPE | FS_IS_FUSE,
        .get_sb         = fuse_get_sb,
        .kill_sb        = kill_anon_super,
 };
@@ -933,7 +933,7 @@ static struct file_system_type fuseblk_fs_type = {
        .name           = "fuseblk",
        .get_sb         = fuse_get_sb_blk,
        .kill_sb        = kill_block_super,
-       .fs_flags       = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
+       .fs_flags       = FS_REQUIRES_DEV | FS_HAS_SUBTYPE | FS_IS_FUSE,
 };
 
 static inline int register_fuseblk(void)
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 7db32b3..be49ee9 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -211,3 +211,4 @@ asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
  out:
        return error;
 }
+EXPORT_SYMBOL(sys_ioctl);
diff --git a/fs/namei.c b/fs/namei.c
index 4ea63ed..65be6a6 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2223,6 +2223,8 @@ int vfs_unlink(struct inode *dir, struct dentry *dentry)
        if (!dir->i_op || !dir->i_op->unlink)
                return -EPERM;
 
+       vfs_check_frozen(dir->i_sb, SB_FREEZE_WRITE);
+
        DQUOT_INIT(dir);
 
        mutex_lock(&dentry->d_inode->i_mutex);
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index b68ec09..6eebd34 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -208,6 +208,7 @@ unifdef-y += filter.h
 unifdef-y += flat.h
 unifdef-y += futex.h
 unifdef-y += fs.h
+unifdef-y += freezer.h
 unifdef-y += gameport.h
 unifdef-y += generic_serial.h
 unifdef-y += hayesesp.h
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index eadaab4..7eb6655 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -171,6 +171,11 @@ wait_queue_head_t *bh_waitq_head(struct buffer_head *bh);
 int fsync_bdev(struct block_device *);
 struct super_block *freeze_bdev(struct block_device *);
 void thaw_bdev(struct block_device *, struct super_block *);
+#define FS_FREEZER_FUSE 1
+#define FS_FREEZER_NORMAL 2
+#define FS_FREEZER_ALL (FS_FREEZER_FUSE | FS_FREEZER_NORMAL)
+void freeze_filesystems(int which);
+void thaw_filesystems(int which);
 int fsync_super(struct super_block *);
 int fsync_no_super(struct block_device *);
 struct buffer_head *__find_get_block(struct block_device *bdev, sector_t block,
diff --git a/include/linux/dyn_pageflags.h b/include/linux/dyn_pageflags.h
new file mode 100644
index 0000000..e85c3ee
--- /dev/null
+++ b/include/linux/dyn_pageflags.h
@@ -0,0 +1,66 @@
+/*
+ * include/linux/dyn_pageflags.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham <nigel at tuxonice net>
+ *
+ * This file is released under the GPLv2.
+ *
+ * It implements support for dynamically allocated bitmaps that are
+ * used for temporary or infrequently used pageflags, in lieu of
+ * bits in the struct page flags entry.
+ */
+
+#ifndef DYN_PAGEFLAGS_H
+#define DYN_PAGEFLAGS_H
+
+#include <linux/mm.h>
+
+struct dyn_pageflags {
+       unsigned long ****bitmap; /* [pg_dat][zone][page_num] */
+       int sparse, initialised;
+       struct list_head list;
+       spinlock_t struct_lock;
+};
+
+#define DYN_PAGEFLAGS_INIT(name) { \
+       .list = LIST_HEAD_INIT(name.list), \
+       .struct_lock = __SPIN_LOCK_UNLOCKED(name.lock) \
+}
+
+#define DECLARE_DYN_PAGEFLAGS(name) \
+       struct dyn_pageflags name = DYN_PAGEFLAGS_INIT(name);
+
+#define BITMAP_FOR_EACH_SET(BITMAP, CTR) \
+       for (CTR = get_next_bit_on(BITMAP, max_pfn + 1); CTR <= max_pfn; \
+               CTR = get_next_bit_on(BITMAP, CTR))
+
+extern void clear_dyn_pageflags(struct dyn_pageflags *pagemap);
+extern int allocate_dyn_pageflags(struct dyn_pageflags *pagemap, int sparse);
+extern void free_dyn_pageflags(struct dyn_pageflags *pagemap);
+extern unsigned long get_next_bit_on(struct dyn_pageflags *bitmap,
+       unsigned long counter);
+
+extern int test_dynpageflag(struct dyn_pageflags *bitmap, struct page *page);
+/*
+ * In sparse bitmaps, setting a flag can fail (we can fail to allocate
+ * the page to store the bit. If this happens, we will BUG(). If you don't
+ * want this behaviour, don't allocate sparse pageflags.
+ */
+extern void set_dynpageflag(struct dyn_pageflags *bitmap, struct page *page);
+extern void clear_dynpageflag(struct dyn_pageflags *bitmap, struct page *page);
+extern void dump_pagemap(struct dyn_pageflags *pagemap);
+
+/*
+ * With the above macros defined, you can do...
+ * #define PagePageset1(page) (test_dynpageflag(&pageset1_map, page))
+ * #define SetPagePageset1(page) (set_dynpageflag(&pageset1_map, page))
+ * #define ClearPagePageset1(page) (clear_dynpageflag(&pageset1_map, page))
+ */
+
+extern void __init dyn_pageflags_init(void);
+extern void __init dyn_pageflags_use_kzalloc(void);
+
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
+extern void dyn_pageflags_hotplug(struct zone *zone);
+#endif
+#endif
diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index deddeed..4d92953 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -127,6 +127,19 @@ static inline void set_freezable(void)
        current->flags &= ~PF_NOFREEZE;
 }
 
+extern int freezer_state;
+#define FREEZER_OFF 0
+#define FREEZER_FILESYSTEMS_FROZEN 1
+#define FREEZER_USERSPACE_FROZEN 2
+#define FREEZER_FULLY_ON 3
+
+static inline int freezer_is_on(void)
+{
+       return (freezer_state == FREEZER_FULLY_ON);
+}
+
+extern void thaw_kernel_threads(void);
+
 /*
  * Tell the freezer that the current task should be frozen by it and that it
  * should send a fake signal to the task to freeze it.
@@ -178,6 +191,8 @@ static inline int freeze_processes(void) { BUG(); return 0; }
 static inline void thaw_processes(void) {}
 
 static inline int try_to_freeze(void) { return 0; }
+static inline int freezer_is_on(void) { return 0; }
+static inline void thaw_kernel_threads(void) { }
 
 static inline void freezer_do_not_count(void) {}
 static inline void freezer_count(void) {}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 580b513..e7a3169 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -8,6 +8,7 @@
 
 #include <linux/limits.h>
 #include <linux/ioctl.h>
+#include <linux/freezer.h>
 
 /*
  * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
@@ -96,6 +97,7 @@ extern int dir_notify_enable;
 #define FS_REQUIRES_DEV 1 
 #define FS_BINARY_MOUNTDATA 2
 #define FS_HAS_SUBTYPE 4
+#define FS_IS_FUSE     8       /* Fuse filesystem - bdev freeze these too */
 #define FS_REVAL_DOT   16384   /* Check the paths ".", ".." for staleness */
 #define FS_RENAME_DOES_D_MOVE  32768   /* FS will handle d_move()
                                         * during rename() internally.
@@ -128,6 +130,7 @@ extern int dir_notify_enable;
 #define MS_RELATIME    (1<<21) /* Update atime relative to mtime/ctime. */
 #define MS_KERNMOUNT   (1<<22) /* this is a kern_mount call */
 #define MS_I_VERSION   (1<<23) /* Update inode I_version field */
+#define MS_FROZEN      (1<<24) /* Frozen by freeze_filesystems() */
 #define MS_ACTIVE      (1<<30)
 #define MS_NOUSER      (1<<31)
 
@@ -1141,8 +1144,11 @@ enum {
        SB_FREEZE_TRANS = 2,
 };
 
-#define vfs_check_frozen(sb, level) \
-       wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
+#define vfs_check_frozen(sb, level) do { \
+       freezer_do_not_count(); \
+       wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))); \
+       freezer_count(); \
+} while (0)
 
 #define get_fs_excl() atomic_inc(&current->fs_excl)
 #define put_fs_excl() atomic_dec(&current->fs_excl)
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 2651f80..c50279d 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -165,6 +165,8 @@ extern int vsprintf(char *buf, const char *, va_list)
        __attribute__ ((format (printf, 2, 0)));
 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
        __attribute__ ((format (printf, 3, 4)));
+extern int snprintf_used(char *buffer, int buffer_size,
+               const char *fmt, ...);
 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
        __attribute__ ((format (printf, 3, 0)));
 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 72a15dc..01a7657 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1264,6 +1264,7 @@ int drop_caches_sysctl_handler(struct ctl_table *, int, struct file *,
                                        void __user *, size_t *, loff_t *);
 unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask,
                        unsigned long lru_pages);
+void drop_pagecache(void);
 
 #ifndef CONFIG_MMU
 #define randomize_va_space 0
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 9ff1b54..100dc2e 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -24,6 +24,8 @@
 /* leave room for NETLINK_DM (DM Events) */
 #define NETLINK_SCSITRANSPORT  18      /* SCSI Transports */
 #define NETLINK_ECRYPTFS       19
+#define NETLINK_TOI_USERUI     20      /* TuxOnIce's userui */
+#define NETLINK_TOI_USM                21      /* Userspace storage manager */
 
 #define MAX_LINKS 32           
 
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 2ce8207..374e892 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -280,4 +280,69 @@ static inline void register_nosave_region_late(unsigned long b, unsigned long e)
 
 extern struct mutex pm_mutex;
 
+enum {
+       TOI_CAN_HIBERNATE,
+       TOI_CAN_RESUME,
+       TOI_RESUME_DEVICE_OK,
+       TOI_NORESUME_SPECIFIED,
+       TOI_SANITY_CHECK_PROMPT,
+       TOI_CONTINUE_REQ,
+       TOI_RESUMED_BEFORE,
+       TOI_BOOT_TIME,
+       TOI_NOW_RESUMING,
+       TOI_IGNORE_LOGLEVEL,
+       TOI_TRYING_TO_RESUME,
+       TOI_LOADING_ALT_IMAGE,
+       TOI_STOP_RESUME,
+       TOI_IO_STOPPED,
+       TOI_NOTIFIERS_PREPARE,
+       TOI_CLUSTER_MODE,
+};
+
+#ifdef CONFIG_TOI
+
+/* Used in init dir files */
+extern unsigned long toi_state;
+#define set_toi_state(bit) (set_bit(bit, &toi_state))
+#define clear_toi_state(bit) (clear_bit(bit, &toi_state))
+#define test_toi_state(bit) (test_bit(bit, &toi_state))
+extern int toi_running;
+
+#else /* !CONFIG_TOI */
+
+#define toi_state              (0)
+#define set_toi_state(bit) do { } while (0)
+#define clear_toi_state(bit) do { } while (0)
+#define test_toi_state(bit) (0)
+#define toi_running (0)
+#endif /* CONFIG_TOI */
+
+#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_TOI
+extern void toi_try_resume(void);
+#else
+#define toi_try_resume() do { } while (0)
+#endif
+
+extern int resume_attempted;
+extern int software_resume(void);
+
+static inline void check_resume_attempted(void)
+{
+       if (resume_attempted)
+               return;
+
+       software_resume();
+}
+#else
+#define check_resume_attempted() do { } while (0)
+#define resume_attempted (0)
+#endif
+
+#ifdef CONFIG_PRINTK_NOSAVE
+#define POSS_NOSAVE __nosavedata
+#else
+#define POSS_NOSAVE
+#endif
+
 #endif /* _LINUX_SUSPEND_H */
diff --git a/include/linux/swap.h b/include/linux/swap.h
index de40f16..44050a6 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -164,6 +164,7 @@ extern unsigned long totalram_pages;
 extern unsigned long totalreserve_pages;
 extern long nr_swap_pages;
 extern unsigned int nr_free_buffer_pages(void);
+extern unsigned int nr_unallocated_buffer_pages(void);
 extern unsigned int nr_free_pagecache_pages(void);
 
 /* Definition of global_page_state not available yet */
@@ -187,6 +188,8 @@ extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
                                                        gfp_t gfp_mask);
 extern int __isolate_lru_page(struct page *page, int mode);
 extern unsigned long shrink_all_memory(unsigned long nr_pages);
+extern void shrink_one_zone(struct zone *zone, unsigned long desired_size,
+               int ps_wanted);
 extern int vm_swappiness;
 extern int remove_mapping(struct address_space *mapping, struct page *page);
 extern long vm_total_pages;
@@ -353,5 +356,10 @@ static inline swp_entry_t get_swap_page(void)
 #define disable_swap_token() do { } while(0)
 
 #endif /* CONFIG_SWAP */
+
+/* For TuxOnIce - unlink LRU pages while saving separately */
+void unlink_lru_lists(void);
+void relink_lru_lists(void);
+
 #endif /* __KERNEL__*/
 #endif /* _LINUX_SWAP_H */
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 3715feb..0463ea1 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -400,6 +400,8 @@ void __init prepare_namespace(void)
        if (is_floppy && rd_doload && rd_load_disk(0))
                ROOT_DEV = Root_RAM0;
 
+       check_resume_attempted();
+
        mount_root();
 out:
        sys_mount(".", "/", NULL, MS_MOVE, NULL);
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 614241b..f3ea292 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -6,6 +6,7 @@
 #include <linux/romfs_fs.h>
 #include <linux/initrd.h>
 #include <linux/sched.h>
+#include <linux/suspend.h>
 #include <linux/freezer.h>
 
 #include "do_mounts.h"
@@ -68,6 +69,11 @@ static void __init handle_initrd(void)
 
        current->flags &= ~PF_FREEZER_SKIP;
 
+       if (!resume_attempted)
+               printk(KERN_ERR "TuxOnIce: No attempt was made to resume from "
+                               "any image that might exist.\n");
+       clear_toi_state(TOI_BOOT_TIME);
+
        /* move initrd to rootfs' /old */
        sys_fchdir(old_fd);
        sys_mount("/", ".", NULL, MS_MOVE, NULL);
diff --git a/init/main.c b/init/main.c
index f6f7042..038a94f 100644
--- a/init/main.c
+++ b/init/main.c
@@ -57,6 +57,7 @@
 #include <linux/pid_namespace.h>
 #include <linux/device.h>
 #include <linux/kthread.h>
+#include <linux/dyn_pageflags.h>
 #include <linux/sched.h>
 #include <linux/signal.h>
 #include <linux/idr.h>
@@ -607,6 +608,7 @@ asmlinkage void __init start_kernel(void)
        softirq_init();
        timekeeping_init();
        time_init();
+       dyn_pageflags_init();
        sched_clock_init();
        profile_init();
        if (!irqs_disabled())
@@ -648,6 +650,7 @@ asmlinkage void __init start_kernel(void)
        enable_debug_pagealloc();
        cpu_hotplug_init();
        kmem_cache_init();
+       dyn_pageflags_use_kzalloc();
        debug_objects_mem_init();
        idr_init_cache();
        setup_per_cpu_pageset();
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index dcd165f..7c80422 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -34,6 +34,18 @@ config PM_VERBOSE
        ---help---
        This option enables verbose messages from the Power Management code.
 
+config PRINTK_NOSAVE
+       depends on PM && PM_DEBUG
+       bool "Preserve printk data from boot kernel when resuming."
+       default n
+       ---help---
+       This option gives printk data and the associated variables the
+       attribute __nosave, which means that they will not be saved as
+       part of the image. The net effect is that after resuming, your
+       dmesg will show the messages from prior to the atomic restore,
+       instead of the messages from the resumed kernel. This may be
+       useful for debugging hibernation.
+
 config CAN_PM_TRACE
        def_bool y
        depends on PM_DEBUG && PM_SLEEP && EXPERIMENTAL
@@ -179,6 +191,272 @@ config PM_STD_PARTITION
          suspended image to. It will simply pick the first available swap 
          device.
 
+menuconfig TOI_CORE
+       tristate "Enhanced Hibernation (TuxOnIce)"
+       depends on HIBERNATION
+       default y
+       ---help---
+         TuxOnIce is the 'new and improved' suspend support.
+         
+         See the TuxOnIce home page (tuxonice.net)
+         for FAQs, HOWTOs and other documentation.
+
+       comment "Image Storage (you need at least one allocator)"
+               depends on TOI_CORE
+       
+       config TOI_FILE
+               tristate "File Allocator"
+               depends on TOI_CORE
+               default y
+               ---help---
+                 This option enables support for storing an image in a
+                 simple file. This should be possible, but we're still
+                 testing it.
+
+       config TOI_SWAP
+               tristate "Swap Allocator"
+               depends on TOI_CORE && SWAP
+               default y
+               ---help---
+                 This option enables support for storing an image in your
+                 swap space.
+
+       comment "General Options"
+               depends on TOI_CORE
+
+       config TOI_DEFAULT_PRE_HIBERNATE
+               string "Default pre-hibernate command"
+               depends on TOI_CORE
+               ---help---
+                 This entry allows you to specify a command to be run prior
+                 to starting a hibernation cycle. If this command returns
+                 a non-zero result code, hibernating will be aborted. If
+                 you're starting hibernation via the hibernate script,
+                 this value should probably be blank.
+
+       config TOI_DEFAULT_POST_HIBERNATE
+               string "Default post-resume command"
+               depends on TOI_CORE
+               ---help---
+                 This entry allows you to specify a command to be run after
+                 completing a hibernation cycle. The return code of this
+                 command is ignored. If you're starting hibernation via the
+                 hibernate script, this value should probably be blank.
+
+       config TOI_CRYPTO
+               tristate "Compression support"
+               depends on TOI_CORE && CRYPTO
+               default y
+               ---help---
+                 This option adds support for using cryptoapi compression
+                 algorithms. Compression is particularly useful as
+                 the LZF support that comes with the TuxOnIce patch can double
+                 your suspend and resume speed.
+
+                 You probably want this, so say Y here.
+
+       comment "No compression support available without Cryptoapi support."
+               depends on TOI_CORE && !CRYPTO
+
+       config TOI_USERUI
+               tristate "Userspace User Interface support"
+               depends on TOI_CORE && NET && (VT || SERIAL_CONSOLE)
+               default y
+               ---help---
+                 This option enabled support for a userspace based user interface
+                 to TuxOnIce, which allows you to have a nice display while suspending
+                 and resuming, and also enables features such as pressing escape to
+                 cancel a cycle or interactive debugging.
+
+       config TOI_USERUI_DEFAULT_PATH
+               string "Default userui program location"
+               default "/usr/local/sbin/tuxonice_fbsplash"
+               depends on TOI_USERUI
+               ---help---
+                 This entry allows you to specify a default path to the userui binary.
+
+       config TOI_KEEP_IMAGE
+               bool "Allow Keep Image Mode"
+               depends on TOI_CORE
+               ---help---
+                 This option allows you to keep and image and reuse it. It is intended
+                 __ONLY__ for use with systems where all filesystems are mounted read-
+                 only (kiosks, for example). To use it, compile this option in and boot
+                 normally. Set the KEEP_IMAGE flag in /sys/power/tuxonice and suspend.
+                 When you resume, the image will not be removed. You will be unable to turn
+                 off swap partitions (assuming you are using the swap allocator), but future
+                 suspends simply do a power-down. The image can be updated using the
+                 kernel command line parameter suspend_act= to turn off the keep image
+                 bit. Keep image mode is a little less user friendly on purpose - it
+                 should not be used without thought!
+
+       config TOI_REPLACE_SWSUSP
+               bool "Replace swsusp by default"
+               default y
+               depends on TOI_CORE
+               ---help---
+                 TuxOnIce can replace swsusp. This option makes that the default state,
+                 requiring you to echo 0 > /sys/power/tuxonice/replace_swsusp if you want
+                 to use the vanilla kernel functionality. Note that your initrd/ramfs will
+                 need to do this before trying to resume, too.
+                 With overriding swsusp enabled, echoing disk  to /sys/power/state will
+                 start a TuxOnIce cycle. If resume= doesn't specify an allocator and both
+                 the swap and file allocators are compiled in, the swap allocator will be
+                 used by default.
+
+       menuconfig TOI_CLUSTER
+               tristate "Cluster support"
+               default n
+               depends on TOI_CORE && NET && BROKEN
+               ---help---
+                 Support for linking multiple machines in a cluster so that they suspend
+                 and resume together.
+
+       config TOI_DEFAULT_CLUSTER_INTERFACE
+               string "Default cluster interface"
+               depends on TOI_CLUSTER
+               ---help---
+                 The default interface on which to communicate with other nodes in
+                 the cluster.
+                 
+                 If no value is set here, cluster support will be disabled by default.
+
+       config TOI_DEFAULT_CLUSTER_KEY
+               string "Default cluster key"
+               default "Default"
+               depends on TOI_CLUSTER
+               ---help---
+                 The default key used by this node. All nodes in the same cluster
+                 have the same key. Multiple clusters may coexist on the same lan
+                 by using different values for this key.
+
+       config TOI_CLUSTER_IMAGE_TIMEOUT
+               int "Timeout when checking for image"
+               default 15
+               depends on TOI_CLUSTER
+               ---help---
+                 Timeout (seconds) before continuing to boot when waiting to see
+                 whether other nodes might have an image. Set to -1 to wait
+                 indefinitely. In WAIT_UNTIL_NODES is non zero, we might continue
+                 booting sooner than this timeout.
+
+       config TOI_CLUSTER_WAIT_UNTIL_NODES
+               int "Nodes without image before continuing"
+               default 0
+               depends on TOI_CLUSTER
+               ---help---
+                 When booting and no image is found, we wait to see if other nodes
+                 have an image before continuing to boot. This value lets us
+                 continue after seeing a certain number of nodes without an image,
+                 instead of continuing to wait for the timeout. Set to 0 to only
+                 use the timeout.
+
+       config TOI_DEFAULT_CLUSTER_PRE_HIBERNATE
+               string "Default pre-hibernate script"
+               depends on TOI_CLUSTER
+               ---help---
+                 The default script to be called when starting to hibernate.
+
+       config TOI_DEFAULT_CLUSTER_POST_HIBERNATE
+               string "Default post-hibernate script"
+               depends on TOI_CLUSTER
+               ---help---
+                 The default script to be called after resuming from hibernation.
+
+       config TOI_CHECKSUM
+               bool "Checksum pageset2"
+               default y
+               depends on TOI_CORE
+               select CRYPTO
+               select CRYPTO_ALGAPI
+               select CRYPTO_MD4
+               ---help---
+                 Adds support for checksumming pageset2 pages, to ensure you really get an
+                 atomic copy. Since some filesystems (XFS especially) change metadata even
+                 when there's no other activity, we need this to check for pages that have
+                 been changed while we were saving the page cache. If your debugging output
+                 always says no pages were resaved, you may be able to safely disable this
+                 option.
+
+       config TOI_DEFAULT_WAIT
+               int "Default waiting time for emergency boot messages"
+               default "25"
+               range -1 32768
+               depends on TOI_CORE
+               help
+                 TuxOnIce can display warnings very early in the process of resuming,
+                 if (for example) it appears that you have booted a kernel that doesn't
+                 match an image on disk. It can then give you the opportunity to either
+                 continue booting that kernel, or reboot the machine. This option can be
+                 used to control how long to wait in such circumstances. -1 means wait
+                 forever. 0 means don't wait at all (do the default action, which will
+                 generally be to continue booting and remove the image). Values of 1 or
+                 more indicate a number of seconds (up to 255) to wait before doing the
+                 default.
+
+       config  TOI_DEFAULT_EXTRA_PAGES_ALLOWANCE
+               int "Default extra pages allowance"
+               default "500"
+               range 500 32768
+               depends on TOI_CORE
+               help
+                 This value controls the default for the allowance TuxOnIce makes for
+                 drivers to allocate extra memory during the atomic copy. The default
+                 value of 500 will be okay if you're not using DRI. If you are using
+                 DRI, the easiest way to find what value to use is to try to hibernate
+                 and look at how many pages were actually needed in the sysfs entry
+                 /sys/power/tuxonice/debug_info (first number on the last line), adding
+                 a little extra because the value is not always the same.
+
+       config  TOI_PAGEFLAGS_TEST
+               tristate "Test pageflags"
+               default N
+               depends on TOI_CORE
+               help
+                 Test pageflags.
+
+config TOI_PAGEFLAGS_EXPORTS
+       bool
+       depends on TOI_PAGEFLAGS_TEST=m
+       default y
+
+config TOI_USERUI_EXPORTS
+       bool
+       depends on TOI_USERUI=m
+       default y
+
+config TOI_SWAP_EXPORTS
+       bool
+       depends on TOI_SWAP=m
+       default y
+
+config TOI_FILE_EXPORTS
+       bool
+       depends on TOI_FILE=m
+       default y
+
+config TOI_CRYPTO_EXPORTS
+       bool
+       depends on TOI_CRYPTO=m
+       default y
+
+config TOI_CORE_EXPORTS
+       bool
+       depends on TOI_CORE=m
+       default y
+
+config TOI_EXPORTS
+       bool
+       depends on TOI_SWAP_EXPORTS || TOI_FILE_EXPORTS || \
+               TOI_CRYPTO_EXPORTS || TOI_CLUSTER=m || \
+               TOI_USERUI_EXPORTS || TOI_PAGEFLAGS_EXPORTS
+       default y
+
+config TOI
+       bool
+       depends on TOI_CORE!=n
+       default y
+
 config APM_EMULATION
        tristate "Advanced Power Management Emulation"
        depends on PM && SYS_SUPPORTS_APM_EMULATION
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 597823b..6d44035 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -4,6 +4,37 @@ EXTRA_CFLAGS   +=      -DDEBUG
 endif
 
 obj-y                          := main.o
+
+tuxonice_core-objs := tuxonice_modules.o tuxonice_sysfs.o tuxonice_highlevel.o \
+               tuxonice_io.o tuxonice_pagedir.o tuxonice_prepare_image.o \
+               tuxonice_extent.o tuxonice_pageflags.o tuxonice_ui.o \
+               tuxonice_power_off.o tuxonice_atomic_copy.o
+
+obj-$(CONFIG_TOI)              += tuxonice_builtin.o
+
+ifdef CONFIG_PM_DEBUG
+tuxonice_core-objs             += tuxonice_alloc.o
+endif
+
+ifdef CONFIG_TOI_CHECKSUM
+tuxonice_core-objs             += tuxonice_checksum.o
+endif
+
+ifdef CONFIG_NET
+tuxonice_core-objs             += tuxonice_storage.o tuxonice_netlink.o
+endif
+
+obj-$(CONFIG_TOI_CORE)         += tuxonice_core.o
+obj-$(CONFIG_TOI_CRYPTO)       += tuxonice_compress.o
+
+obj-$(CONFIG_TOI_SWAP)         += tuxonice_block_io.o tuxonice_swap.o
+obj-$(CONFIG_TOI_FILE)         += tuxonice_block_io.o tuxonice_file.o
+obj-$(CONFIG_TOI_CLUSTER)      += tuxonice_cluster.o
+
+obj-$(CONFIG_TOI_USERUI)       += tuxonice_userui.o
+
+obj-$(CONFIG_TOI_PAGEFLAGS_TEST)       += toi_pageflags_test.o
+
 obj-$(CONFIG_PM_SLEEP)         += process.o console.o
 obj-$(CONFIG_HIBERNATION)      += swsusp.o disk.o snapshot.o swap.o user.o
 
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index bbd85c6..2e444e6 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -25,9 +25,11 @@
 
 #include "power.h"
 
+#include "tuxonice.h"
+#include "tuxonice_builtin.h"
 
 static int noresume = 0;
-static char resume_file[256] = CONFIG_PM_STD_PARTITION;
+char resume_file[256] = CONFIG_PM_STD_PARTITION;
 dev_t swsusp_resume_device;
 sector_t swsusp_resume_block;
 
@@ -105,7 +107,7 @@ static int hibernation_test(int level) { return 0; }
  *     hibernation
  */
 
-static int platform_begin(int platform_mode)
+int platform_begin(int platform_mode)
 {
        return (platform_mode && hibernation_ops) ?
                hibernation_ops->begin() : 0;
@@ -116,7 +118,7 @@ static int platform_begin(int platform_mode)
  *     working state
  */
 
-static void platform_end(int platform_mode)
+void platform_end(int platform_mode)
 {
        if (platform_mode && hibernation_ops)
                hibernation_ops->end();
@@ -127,7 +129,7 @@ static void platform_end(int platform_mode)
  *     platform driver if so configured and return an error code if it fails
  */
 
-static int platform_pre_snapshot(int platform_mode)
+int platform_pre_snapshot(int platform_mode)
 {
        return (platform_mode && hibernation_ops) ?
                hibernation_ops->pre_snapshot() : 0;
@@ -138,7 +140,7 @@ static int platform_pre_snapshot(int platform_mode)
  *     of operation using the platform driver (called with interrupts disabled)
  */
 
-static void platform_leave(int platform_mode)
+void platform_leave(int platform_mode)
 {
        if (platform_mode && hibernation_ops)
                hibernation_ops->leave();
@@ -149,7 +151,7 @@ static void platform_leave(int platform_mode)
  *     using the platform driver (must be called after platform_prepare())
  */
 
-static void platform_finish(int platform_mode)
+void platform_finish(int platform_mode)
 {
        if (platform_mode && hibernation_ops)
                hibernation_ops->finish();
@@ -161,7 +163,7 @@ static void platform_finish(int platform_mode)
  *     called, platform_restore_cleanup() must be called.
  */
 
-static int platform_pre_restore(int platform_mode)
+int platform_pre_restore(int platform_mode)
 {
        return (platform_mode && hibernation_ops) ?
                hibernation_ops->pre_restore() : 0;
@@ -174,7 +176,7 @@ static int platform_pre_restore(int platform_mode)
  *     regardless of the result of platform_pre_restore().
  */
 
-static void platform_restore_cleanup(int platform_mode)
+void platform_restore_cleanup(int platform_mode)
 {
        if (platform_mode && hibernation_ops)
                hibernation_ops->restore_cleanup();
@@ -508,6 +510,11 @@ int hibernate(void)
 {
        int error;
 
+#ifdef CONFIG_TOI
+       if (test_action_state(TOI_REPLACE_SWSUSP))
+               return toi_try_hibernate(1);
+#endif
+
        mutex_lock(&pm_mutex);
        /* The snapshot device should not be opened while we're running */
        if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
@@ -580,10 +587,21 @@ int hibernate(void)
  *
  */
 
-static int software_resume(void)
+int software_resume(void)
 {
        int error;
        unsigned int flags;
+       resume_attempted = 1;
+
+#ifdef CONFIG_TOI
+       /*
+        * We can't know (until an image header - if any - is loaded), whether
+        * we did override swsusp. We therefore ensure that both are tried.
+        */
+       if (test_action_state(TOI_REPLACE_SWSUSP))
+               printk(KERN_INFO "Replacing swsusp.\n");
+               toi_try_resume();
+#endif
 
        /*
         * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
@@ -596,6 +614,7 @@ static int software_resume(void)
         * here to avoid lockdep complaining.
         */
        mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
+
        if (!swsusp_resume_device) {
                if (!strlen(resume_file)) {
                        mutex_unlock(&pm_mutex);
@@ -667,9 +686,6 @@ static int software_resume(void)
        return error;
 }
 
-late_initcall(software_resume);
-
-
 static const char * const hibernation_modes[] = {
        [HIBERNATION_PLATFORM]  = "platform",
        [HIBERNATION_SHUTDOWN]  = "shutdown",
@@ -882,6 +898,7 @@ static int __init resume_offset_setup(char *str)
 static int __init noresume_setup(char *str)
 {
        noresume = 1;
+       set_toi_state(TOI_NORESUME_SPECIFIED);
        return 1;
 }
 
diff --git a/kernel/power/power.h b/kernel/power/power.h
index acc0c10..6a4a5b4 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -1,7 +1,16 @@
+/*
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ */
+
+#ifndef KERNEL_POWER_POWER_H
+#define KERNEL_POWER_POWER_H
+
 #include <linux/suspend.h>
 #include <linux/suspend_ioctls.h>
 #include <linux/utsname.h>
 #include <linux/freezer.h>
+#include "tuxonice.h"
+#include "tuxonice_builtin.h"
 
 struct swsusp_info {
        struct new_utsname      uts;
@@ -21,18 +30,22 @@ struct swsusp_info {
 extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
 extern int arch_hibernation_header_restore(void *addr);
 
-static inline int init_header_complete(struct swsusp_info *info)
+static inline int init_swsusp_header_complete(struct swsusp_info *info)
 {
        return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
 }
 
-static inline char *check_image_kernel(struct swsusp_info *info)
+static inline char *check_swsusp_image_kernel(struct swsusp_info *info)
 {
        return arch_hibernation_header_restore(info) ?
                        "architecture specific data" : NULL;
 }
+#else
+extern char *check_swsusp_image_kernel(struct swsusp_info *info);
 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
+extern int init_swsusp_header(struct swsusp_info *info);
 
+extern char resume_file[256];
 /*
  * Keep some memory free so that I/O operations can succeed without paging
  * [Might this be more than 4 MB?]
@@ -63,6 +76,8 @@ static struct kobj_attribute _name##_attr = { \
        .store  = _name##_store,                \
 }
 
+extern struct pbe *restore_pblist;
+
 /* Preferred image size in bytes (default 500 MB) */
 extern unsigned long image_size;
 extern int in_suspend;
@@ -223,3 +238,26 @@ static inline void suspend_thaw_processes(void)
 {
 }
 #endif
+
+extern struct page *saveable_page(unsigned long pfn);
+#ifdef CONFIG_HIGHMEM
+extern struct page *saveable_highmem_page(unsigned long pfn);
+#else
+static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
+#endif
+
+#define PBES_PER_PAGE (PAGE_SIZE / sizeof(struct pbe))
+extern struct list_head nosave_regions;
+
+/**
+ *     This structure represents a range of page frames the contents of which
+ *     should not be saved during the suspend.
+ */
+
+struct nosave_region {
+       struct list_head list;
+       unsigned long start_pfn;
+       unsigned long end_pfn;
+};
+
+#endif
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 278946a..ba2eb75 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -13,6 +13,10 @@
 #include <linux/module.h>
 #include <linux/syscalls.h>
 #include <linux/freezer.h>
+#include <linux/buffer_head.h>
+
+int freezer_state;
+EXPORT_SYMBOL(freezer_state);
 
 /* 
  * Timeout for stopping processes
@@ -201,7 +205,8 @@ static int try_to_freeze_tasks(bool sig_only)
                do_each_thread(g, p) {
                        task_lock(p);
                        if (freezing(p) && !freezer_should_skip(p))
-                               printk(KERN_ERR " %s\n", p->comm);
+                               printk(KERN_ERR " %s (%d) failed to freeze.\n",
+                                               p->comm, p->pid);
                        cancel_freezing(p);
                        task_unlock(p);
                } while_each_thread(g, p);
@@ -221,17 +226,25 @@ int freeze_processes(void)
 {
        int error;
 
-       printk("Freezing user space processes ... ");
+       printk(KERN_INFO "Stopping fuse filesystems.\n");
+       freeze_filesystems(FS_FREEZER_FUSE);
+       freezer_state = FREEZER_FILESYSTEMS_FROZEN;
+       printk(KERN_INFO "Freezing user space processes ... ");
        error = try_to_freeze_tasks(true);
        if (error)
                goto Exit;
-       printk("done.\n");
+       printk(KERN_INFO "done.\n");
 
-       printk("Freezing remaining freezable tasks ... ");
+       sys_sync();
+       printk(KERN_INFO "Stopping normal filesystems.\n");
+       freeze_filesystems(FS_FREEZER_NORMAL);
+       freezer_state = FREEZER_USERSPACE_FROZEN;
+       printk(KERN_INFO "Freezing remaining freezable tasks ... ");
        error = try_to_freeze_tasks(false);
        if (error)
                goto Exit;
        printk("done.");
+       freezer_state = FREEZER_FULLY_ON;
  Exit:
        BUG_ON(in_atomic());
        printk("\n");
@@ -257,11 +270,35 @@ static void thaw_tasks(bool nosig_only)
 
 void thaw_processes(void)
 {
-       printk("Restarting tasks ... ");
-       thaw_tasks(true);
+       int old_state = freezer_state;
+
+       if (old_state == FREEZER_OFF)
+               return;
+
+       /*
+        * Change state beforehand because thawed tasks might submit I/O
+        * immediately.
+        */
+       freezer_state = FREEZER_OFF;
+
+       printk(KERN_INFO "Restarting all filesystems ...\n");
+       thaw_filesystems(FS_FREEZER_ALL);
+
+       printk(KERN_INFO "Restarting tasks ... ");
+
+       if (old_state == FREEZER_FULLY_ON)
+               thaw_tasks(true);
        thaw_tasks(false);
        schedule();
        printk("done.\n");
 }
 
 EXPORT_SYMBOL(refrigerator);
+
+void thaw_kernel_threads(void)
+{
+       freezer_state = FREEZER_USERSPACE_FROZEN;
+       printk(KERN_INFO "Restarting normal filesystems.\n");
+       thaw_filesystems(FS_FREEZER_NORMAL);
+       thaw_tasks(true);
+}
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 5d2ab83..bdb3071 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -33,6 +33,7 @@
 #include <asm/io.h>
 
 #include "power.h"
+#include "tuxonice_builtin.h"
 
 static int swsusp_page_is_free(struct page *);
 static void swsusp_set_page_forbidden(struct page *);
@@ -44,6 +45,12 @@ static void swsusp_unset_page_forbidden(struct page *);
  * directly to their "original" page frames.
  */
 struct pbe *restore_pblist;
+int resume_attempted;
+EXPORT_SYMBOL_GPL(resume_attempted);
+
+#ifdef CONFIG_TOI
+#include "tuxonice_pagedir.h"
+#endif
 
 /* Pointer to an auxiliary buffer (1 page) */
 static void *buffer;
@@ -86,6 +93,11 @@ static void *get_image_page(gfp_t gfp_mask, int safe_needed)
 
 unsigned long get_safe_page(gfp_t gfp_mask)
 {
+#ifdef CONFIG_TOI
+       if (toi_running)
+               return toi_get_nonconflicting_page();
+#endif
+
        return (unsigned long)get_image_page(gfp_mask, PG_SAFE);
 }
 
@@ -561,18 +573,8 @@ static unsigned long memory_bm_next_pfn(struct memory_bitmap *bm)
        return bb->start_pfn + bit;
 }
 
-/**
- *     This structure represents a range of page frames the contents of which
- *     should not be saved during the suspend.
- */
-
-struct nosave_region {
-       struct list_head list;
-       unsigned long start_pfn;
-       unsigned long end_pfn;
-};
-
-static LIST_HEAD(nosave_regions);
+LIST_HEAD(nosave_regions);
+EXPORT_SYMBOL_GPL(nosave_regions);
 
 /**
  *     register_nosave_region - register a range of page frames the contents
@@ -809,7 +811,7 @@ static unsigned int count_free_highmem_pages(void)
  *     and it isn't a part of a free chunk of pages.
  */
 
-static struct page *saveable_highmem_page(unsigned long pfn)
+struct page *saveable_highmem_page(unsigned long pfn)
 {
        struct page *page;
 
@@ -851,8 +853,6 @@ unsigned int count_highmem_pages(void)
        }
        return n;
 }
-#else
-static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
 #endif /* CONFIG_HIGHMEM */
 
 /**
@@ -864,7 +864,7 @@ static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
  *     a free chunk of pages.
  */
 
-static struct page *saveable_page(unsigned long pfn)
+struct page *saveable_page(unsigned long pfn)
 {
        struct page *page;
 
@@ -1198,6 +1198,11 @@ asmlinkage int swsusp_save(void)
 {
        unsigned int nr_pages, nr_highmem;
 
+#ifdef CONFIG_TOI
+       if (toi_running)
+               return toi_post_context_save();
+#endif
+
        printk(KERN_INFO "PM: Creating hibernation image: \n");
 
        drain_local_pages(NULL);
@@ -1238,14 +1243,14 @@ asmlinkage int swsusp_save(void)
 }
 
 #ifndef CONFIG_ARCH_HIBERNATION_HEADER
-static int init_header_complete(struct swsusp_info *info)
+int init_swsusp_header_complete(struct swsusp_info *info)
 {
        memcpy(&info->uts, init_utsname(), sizeof(struct new_utsname));
        info->version_code = LINUX_VERSION_CODE;
        return 0;
 }
 
-static char *check_image_kernel(struct swsusp_info *info)
+char *check_swsusp_image_kernel(struct swsusp_info *info)
 {
        if (info->version_code != LINUX_VERSION_CODE)
                return "kernel version";
@@ -1259,6 +1264,7 @@ static char *check_image_kernel(struct swsusp_info *info)
                return "machine";
        return NULL;
 }
+EXPORT_SYMBOL_GPL(check_swsusp_image_kernel);
 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
 
 unsigned long snapshot_get_image_size(void)
@@ -1266,7 +1272,7 @@ unsigned long snapshot_get_image_size(void)
        return nr_copy_pages + nr_meta_pages + 1;
 }
 
-static int init_header(struct swsusp_info *info)
+int init_swsusp_header(struct swsusp_info *info)
 {
        memset(info, 0, sizeof(struct swsusp_info));
        info->num_physpages = num_physpages;
@@ -1274,7 +1280,7 @@ static int init_header(struct swsusp_info *info)
        info->pages = snapshot_get_image_size();
        info->size = info->pages;
        info->size <<= PAGE_SHIFT;
-       return init_header_complete(info);
+       return init_swsusp_header_complete(info);
 }
 
 /**
@@ -1330,7 +1336,7 @@ int snapshot_read_next(struct snapshot_handle *handle, size_t count)
        if (!handle->offset) {
                int error;
 
-               error = init_header((struct swsusp_info *)buffer);
+               error = init_swsusp_header((struct swsusp_info *)buffer);
                if (error)
                        return error;
                handle->buffer = buffer;
@@ -1427,7 +1433,7 @@ static int check_header(struct swsusp_info *info)
 {
        char *reason;
 
-       reason = check_image_kernel(info);
+       reason = check_swsusp_image_kernel(info);
        if (!reason && info->num_physpages != num_physpages)
                reason = "memory size";
        if (reason) {
diff --git a/kernel/power/toi_pageflags_test.c b/kernel/power/toi_pageflags_test.c
new file mode 100644
index 0000000..381f05b
--- /dev/null
+++ b/kernel/power/toi_pageflags_test.c
@@ -0,0 +1,80 @@
+/*
+ * TuxOnIce pageflags tester.
+ */
+
+#include "linux/module.h"
+#include "linux/bootmem.h"
+#include "linux/sched.h"
+#include "linux/dyn_pageflags.h"
+
+DECLARE_DYN_PAGEFLAGS(test_map);
+
+static char *bits_on(void)
+{
+       char *page = (char *) get_zeroed_page(GFP_KERNEL);
+       unsigned long index = get_next_bit_on(&test_map, max_pfn + 1);
+       int pos = 0;
+
+       while (index <= max_pfn) {
+               pos += snprintf_used(page + pos, PAGE_SIZE - pos - 1, "%d ",
+                               index);
+               index = get_next_bit_on(&test_map, index);
+       }
+
+       return page;
+}
+
+static __init int do_check(void)
+{
+       unsigned long index;
+       int step = 1, steps = 100;
+
+       allocate_dyn_pageflags(&test_map, 0);
+
+       for (index = 1; index < max_pfn; index++) {
+               char *result;
+               char compare[100];
+
+               if (index > (max_pfn / steps * step)) {
+                       printk(KERN_INFO "%d/%d\r", step, steps);
+                       step++;
+               }
+
+
+               if (!pfn_valid(index))
+                       continue;
+
+               clear_dyn_pageflags(&test_map);
+               set_dynpageflag(&test_map, pfn_to_page(0));
+               set_dynpageflag(&test_map, pfn_to_page(index));
+
+               sprintf(compare, "0 %lu ", index);
+
+               result = bits_on();
+
+               if (strcmp(result, compare)) {
+                       printk(KERN_INFO "Expected \"%s\", got \"%s\"\n",
+                                       result, compare);
+               }
+
+               free_page((unsigned long) result);
+               schedule();
+       }
+
+       free_dyn_pageflags(&test_map);
+       return 0;
+}
+
+#ifdef MODULE
+static __exit void check_unload(void)
+{
+}
+
+module_init(do_check);
+module_exit(check_unload);
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("Pageflags testing");
+MODULE_LICENSE("GPL");
+#else
+late_initcall(do_check);
+#endif
diff --git a/kernel/power/tuxonice.h b/kernel/power/tuxonice.h
new file mode 100644
index 0000000..912e89a
--- /dev/null
+++ b/kernel/power/tuxonice.h
@@ -0,0 +1,210 @@
+/*
+ * kernel/power/tuxonice.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It contains declarations used throughout swsusp.
+ *
+ */
+
+#ifndef KERNEL_POWER_TOI_H
+#define KERNEL_POWER_TOI_H
+
+#include <linux/delay.h>
+#include <linux/bootmem.h>
+#include <linux/suspend.h>
+#include <linux/dyn_pageflags.h>
+#include <linux/fs.h>
+#include <linux/kmod.h>
+#include <asm/setup.h>
+#include "tuxonice_pageflags.h"
+
+#define TOI_CORE_VERSION "3.0-rc7"
+
+#define MY_BOOT_KERNEL_DATA_VERSION 1
+
+struct toi_boot_kernel_data {
+       int version;
+       int size;
+       unsigned long toi_action;
+       unsigned long toi_debug_state;
+       int toi_default_console_level;
+       int toi_io_time[2][2];
+       char toi_nosave_commandline[COMMAND_LINE_SIZE];
+};
+
+extern struct toi_boot_kernel_data toi_bkd;
+
+/* Location of book kernel data struct in kernel being resumed */
+extern unsigned long boot_kernel_data_buffer;
+
+/*              == Action states ==            */
+
+enum {
+       TOI_REBOOT,
+       TOI_PAUSE,
+       TOI_LOGALL,
+       TOI_CAN_CANCEL,
+       TOI_KEEP_IMAGE,
+       TOI_FREEZER_TEST,
+       TOI_SINGLESTEP,
+       TOI_PAUSE_NEAR_PAGESET_END,
+       TOI_TEST_FILTER_SPEED,
+       TOI_TEST_BIO,
+       TOI_NO_PAGESET2,
+       TOI_PM_PREPARE_CONSOLE,
+       TOI_IGNORE_ROOTFS,
+       TOI_REPLACE_SWSUSP,
+       TOI_PAGESET2_FULL,
+       TOI_ABORT_ON_RESAVE_NEEDED,
+       TOI_NO_MULTITHREADED_IO,
+       TOI_NO_DIRECT_LOAD,
+       TOI_LATE_CPU_HOTPLUG,
+       TOI_GET_MAX_MEM_ALLOCD,
+       TOI_NO_FLUSHER_THREAD,
+};
+
+#define clear_action_state(bit) (test_and_clear_bit(bit, &toi_bkd.toi_action))
+#define test_action_state(bit) (test_bit(bit, &toi_bkd.toi_action))
+
+/*              == Result states ==            */
+
+enum {
+       TOI_ABORTED,
+       TOI_ABORT_REQUESTED,
+       TOI_NOSTORAGE_AVAILABLE,
+       TOI_INSUFFICIENT_STORAGE,
+       TOI_FREEZING_FAILED,
+       TOI_KEPT_IMAGE,
+       TOI_WOULD_EAT_MEMORY,
+       TOI_UNABLE_TO_FREE_ENOUGH_MEMORY,
+       TOI_PM_SEM,
+       TOI_DEVICE_REFUSED,
+       TOI_EXTRA_PAGES_ALLOW_TOO_SMALL,
+       TOI_UNABLE_TO_PREPARE_IMAGE,
+       TOI_FAILED_MODULE_INIT,
+       TOI_FAILED_MODULE_CLEANUP,
+       TOI_FAILED_IO,
+       TOI_OUT_OF_MEMORY,
+       TOI_IMAGE_ERROR,
+       TOI_PLATFORM_PREP_FAILED,
+       TOI_CPU_HOTPLUG_FAILED,
+       TOI_ARCH_PREPARE_FAILED,
+       TOI_RESAVE_NEEDED,
+       TOI_CANT_SUSPEND,
+       TOI_NOTIFIERS_PREPARE_FAILED,
+       TOI_PRE_SNAPSHOT_FAILED,
+       TOI_PRE_RESTORE_FAILED,
+};
+
+extern unsigned long toi_result;
+
+#define set_result_state(bit) (test_and_set_bit(bit, &toi_result))
+#define set_abort_result(bit) (test_and_set_bit(TOI_ABORTED, &toi_result), \
+                               test_and_set_bit(bit, &toi_result))
+#define clear_result_state(bit) (test_and_clear_bit(bit, &toi_result))
+#define test_result_state(bit) (test_bit(bit, &toi_result))
+
+/*      == Debug sections and levels ==        */
+
+/* debugging levels. */
+enum {
+       TOI_STATUS = 0,
+       TOI_ERROR = 2,
+       TOI_LOW,
+       TOI_MEDIUM,
+       TOI_HIGH,
+       TOI_VERBOSE,
+};
+
+enum {
+       TOI_ANY_SECTION,
+       TOI_EAT_MEMORY,
+       TOI_IO,
+       TOI_HEADER,
+       TOI_WRITER,
+       TOI_MEMORY,
+};
+
+#define set_debug_state(bit) (test_and_set_bit(bit, &toi_bkd.toi_debug_state))
+#define clear_debug_state(bit) \
+       (test_and_clear_bit(bit, &toi_bkd.toi_debug_state))
+#define test_debug_state(bit) (test_bit(bit, &toi_bkd.toi_debug_state))
+
+/*             == Steps in hibernating ==      */
+
+enum {
+       STEP_HIBERNATE_PREPARE_IMAGE,
+       STEP_HIBERNATE_SAVE_IMAGE,
+       STEP_HIBERNATE_POWERDOWN,
+       STEP_RESUME_CAN_RESUME,
+       STEP_RESUME_LOAD_PS1,
+       STEP_RESUME_DO_RESTORE,
+       STEP_RESUME_READ_PS2,
+       STEP_RESUME_GO,
+       STEP_RESUME_ALT_IMAGE,
+       STEP_CLEANUP,
+       STEP_QUIET_CLEANUP
+};
+
+/*             == TuxOnIce states ==
+       (see also include/linux/suspend.h)      */
+
+#define get_toi_state()  (toi_state)
+#define restore_toi_state(saved_state) \
+       do { toi_state = saved_state; } while (0)
+
+/*             == Module support ==            */
+
+struct toi_core_fns {
+       int (*post_context_save)(void);
+       unsigned long (*get_nonconflicting_page)(void);
+       int (*try_hibernate)(int have_pmsem);
+       void (*try_resume)(void);
+};
+
+extern struct toi_core_fns *toi_core_fns;
+
+/*             == All else ==                  */
+#define KB(x) ((x) << (PAGE_SHIFT - 10))
+#define MB(x) ((x) >> (20 - PAGE_SHIFT))
+
+extern int toi_start_anything(int toi_or_resume);
+extern void toi_finish_anything(int toi_or_resume);
+
+extern int save_image_part1(void);
+extern int toi_atomic_restore(void);
+
+extern int _toi_try_hibernate(int have_pmsem);
+extern void __toi_try_resume(void);
+
+extern int __toi_post_context_save(void);
+
+extern unsigned int nr_hibernates;
+extern char alt_resume_param[256];
+
+extern void copyback_post(void);
+extern int toi_hibernate(void);
+extern long extra_pd1_pages_used;
+
+#define SECTOR_SIZE 512
+
+extern void toi_early_boot_message(int can_erase_image, int default_answer,
+       char *warning_reason, ...);
+
+static inline int load_direct(struct page *page)
+{
+       return test_action_state(TOI_NO_DIRECT_LOAD) ? 0 :
+               PagePageset1Copy(page);
+}
+
+extern int pre_resume_freeze(void);
+extern int do_check_can_resume(void);
+extern int do_toi_step(int step);
+extern int toi_launch_userspace_program(char *command, int channel_no,
+               enum umh_wait wait);
+
+extern char *tuxonice_signature;
+#endif
diff --git a/kernel/power/tuxonice_alloc.c b/kernel/power/tuxonice_alloc.c
new file mode 100644
index 0000000..101f65b
--- /dev/null
+++ b/kernel/power/tuxonice_alloc.c
@@ -0,0 +1,293 @@
+/*
+ * kernel/power/tuxonice_alloc.c
+ *
+ * Copyright (C) 2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ */
+
+#ifdef CONFIG_PM_DEBUG
+#include <linux/slab.h>
+#include <linux/module.h>
+#include "tuxonice_modules.h"
+#include "tuxonice_sysfs.h"
+
+#define TOI_ALLOC_PATHS 39
+
+DEFINE_MUTEX(toi_alloc_mutex);
+
+static struct toi_module_ops toi_alloc_ops;
+
+static int toi_fail_num;
+static atomic_t toi_alloc_count[TOI_ALLOC_PATHS],
+               toi_free_count[TOI_ALLOC_PATHS],
+               toi_test_count[TOI_ALLOC_PATHS],
+               toi_fail_count[TOI_ALLOC_PATHS];
+int toi_cur_allocd[TOI_ALLOC_PATHS], toi_max_allocd[TOI_ALLOC_PATHS];
+int cur_allocd, max_allocd;
+
+static char *toi_alloc_desc[TOI_ALLOC_PATHS] = {
+       "", /* 0 */
+       "get_io_info_struct",
+       "extent",
+       "extent (loading chain)",
+       "userui channel",
+       "userui arg", /* 5 */
+       "attention list metadata",
+       "extra pagedir memory metadata",
+       "bdev metadata",
+       "extra pagedir memory",
+       "header_locations_read", /* 10 */
+       "bio queue",
+       "prepare_readahead",
+       "i/o buffer",
+       "writer buffer in bio_init",
+       "checksum buffer", /* 15 */
+       "compression buffer",
+       "filewriter signature op",
+       "set resume param alloc1",
+       "set resume param alloc2",
+       "debugging info buffer", /* 20 */
+       "check can resume buffer",
+       "write module config buffer",
+       "read module config buffer",
+       "write image header buffer",
+       "read pageset1 buffer", /* 25 */
+       "get_have_image_data buffer",
+       "checksum page",
+       "worker rw loop",
+       "get nonconflicting page",
+       "ps1 load addresses", /* 30 */
+       "remove swap image",
+       "swap image exists",
+       "swap parse sig location",
+       "sysfs kobj",
+       "swap mark resume attempted buffer", /* 35 */
+       "cluster member",
+       "boot kernel data buffer",
+       "setting swap signature"
+};
+
+#define MIGHT_FAIL(FAIL_NUM, FAIL_VAL) \
+       do { \
+               BUG_ON(FAIL_NUM >= TOI_ALLOC_PATHS); \
+               \
+               if (FAIL_NUM == toi_fail_num) { \
+                       atomic_inc(&toi_test_count[FAIL_NUM]); \
+                       toi_fail_num = 0; \
+                       return FAIL_VAL; \
+               } \
+       } while (0)
+
+static void alloc_update_stats(int fail_num, void *result)
+{
+       if (!result) {
+               atomic_inc(&toi_fail_count[fail_num]);
+               return;
+       }
+
+       atomic_inc(&toi_alloc_count[fail_num]);
+       if (unlikely(test_action_state(TOI_GET_MAX_MEM_ALLOCD))) {
+               mutex_lock(&toi_alloc_mutex);
+               toi_cur_allocd[fail_num]++;
+               cur_allocd++;
+               if (unlikely(cur_allocd > max_allocd)) {
+                       int i;
+
+                       for (i = 0; i < TOI_ALLOC_PATHS; i++)
+                               toi_max_allocd[i] = toi_cur_allocd[i];
+                       max_allocd = cur_allocd;
+               }
+               mutex_unlock(&toi_alloc_mutex);
+       }
+}
+
+static void free_update_stats(int fail_num)
+{
+       BUG_ON(fail_num >= TOI_ALLOC_PATHS);
+       atomic_inc(&toi_free_count[fail_num]);
+       if (unlikely(test_action_state(TOI_GET_MAX_MEM_ALLOCD))) {
+               mutex_lock(&toi_alloc_mutex);
+               cur_allocd--;
+               toi_cur_allocd[fail_num]--;
+               mutex_unlock(&toi_alloc_mutex);
+       }
+}
+
+void *toi_kzalloc(int fail_num, size_t size, gfp_t flags)
+{
+       void *result;
+
+       if (toi_alloc_ops.enabled)
+               MIGHT_FAIL(fail_num, NULL);
+       result = kzalloc(size, flags);
+       if (toi_alloc_ops.enabled)
+               alloc_update_stats(fail_num, result);
+       return result;
+}
+
+unsigned long toi_get_free_pages(int fail_num, gfp_t mask,
+               unsigned int order)
+{
+       unsigned long result;
+
+       if (toi_alloc_ops.enabled)
+               MIGHT_FAIL(fail_num, 0);
+       result = __get_free_pages(mask, order);
+       if (toi_alloc_ops.enabled)
+               alloc_update_stats(fail_num, (void *) result);
+       return result;
+}
+
+struct page *toi_alloc_page(int fail_num, gfp_t mask)
+{
+       struct page *result;
+
+       if (toi_alloc_ops.enabled)
+               MIGHT_FAIL(fail_num, 0);
+       result = alloc_page(mask);
+       if (toi_alloc_ops.enabled)
+               alloc_update_stats(fail_num, (void *) result);
+       return result;
+}
+
+unsigned long toi_get_zeroed_page(int fail_num, gfp_t mask)
+{
+       unsigned long result;
+
+       if (toi_alloc_ops.enabled)
+               MIGHT_FAIL(fail_num, 0);
+       result = get_zeroed_page(mask);
+       if (toi_alloc_ops.enabled)
+               alloc_update_stats(fail_num, (void *) result);
+       return result;
+}
+
+void toi_kfree(int fail_num, const void *arg)
+{
+       if (arg && toi_alloc_ops.enabled)
+               free_update_stats(fail_num);
+
+       kfree(arg);
+}
+
+void toi_free_page(int fail_num, unsigned long virt)
+{
+       if (virt && toi_alloc_ops.enabled)
+               free_update_stats(fail_num);
+
+       free_page(virt);
+}
+
+void toi__free_page(int fail_num, struct page *page)
+{
+       if (page && toi_alloc_ops.enabled)
+               free_update_stats(fail_num);
+
+       __free_page(page);
+}
+
+void toi_free_pages(int fail_num, struct page *page, int order)
+{
+       if (page && toi_alloc_ops.enabled)
+               free_update_stats(fail_num);
+
+       __free_pages(page, order);
+}
+
+void toi_alloc_print_debug_stats(void)
+{
+       int i, header_done = 0;
+
+       if (!toi_alloc_ops.enabled)
+               return;
+
+       for (i = 0; i < TOI_ALLOC_PATHS; i++)
+               if (atomic_read(&toi_alloc_count[i]) !=
+                   atomic_read(&toi_free_count[i])) {
+                       if (!header_done) {
+                               printk(KERN_INFO "Idx  Allocs   Frees   Tests "
+                                       "  Fails Max     Description\n");
+                               header_done = 1;
+                       }
+
+                       printk(KERN_INFO "%3d %7d %7d %7d %7d %7d %s\n", i,
+                               atomic_read(&toi_alloc_count[i]),
+                               atomic_read(&toi_free_count[i]),
+                               atomic_read(&toi_test_count[i]),
+                               atomic_read(&toi_fail_count[i]),
+                               toi_max_allocd[i],
+                               toi_alloc_desc[i]);
+               }
+}
+EXPORT_SYMBOL_GPL(toi_alloc_print_debug_stats);
+
+static int toi_alloc_initialise(int starting_cycle)
+{
+       int i;
+
+       if (starting_cycle && toi_alloc_ops.enabled) {
+               for (i = 0; i < TOI_ALLOC_PATHS; i++) {
+                       atomic_set(&toi_alloc_count[i], 0);
+                       atomic_set(&toi_free_count[i], 0);
+                       atomic_set(&toi_test_count[i], 0);
+                       atomic_set(&toi_fail_count[i], 0);
+                       toi_cur_allocd[i] = 0;
+                       toi_max_allocd[i] = 0;
+               };
+               max_allocd = 0;
+               cur_allocd = 0;
+       }
+
+       return 0;
+}
+
+static struct toi_sysfs_data sysfs_params[] = {
+       { TOI_ATTR("failure_test", SYSFS_RW),
+         SYSFS_INT(&toi_fail_num, 0, 99, 0)
+       },
+
+       { TOI_ATTR("find_max_mem_allocated", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_GET_MAX_MEM_ALLOCD, 0)
+       },
+
+       { TOI_ATTR("enabled", SYSFS_RW),
+         SYSFS_INT(&toi_alloc_ops.enabled, 0, 1, 0)
+       }
+};
+
+static struct toi_module_ops toi_alloc_ops = {
+       .type                                   = MISC_HIDDEN_MODULE,
+       .name                                   = "allocation debugging",
+       .directory                              = "alloc",
+       .module                                 = THIS_MODULE,
+       .early                                  = 1,
+       .initialise                             = toi_alloc_initialise,
+
+       .sysfs_data             = sysfs_params,
+       .num_sysfs_entries      = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+int toi_alloc_init(void)
+{
+       int result = toi_register_module(&toi_alloc_ops);
+       toi_alloc_ops.enabled = 0;
+       return result;
+}
+
+void toi_alloc_exit(void)
+{
+       toi_unregister_module(&toi_alloc_ops);
+}
+#ifdef CONFIG_TOI_EXPORTS
+EXPORT_SYMBOL_GPL(toi_kzalloc);
+EXPORT_SYMBOL_GPL(toi_get_free_pages);
+EXPORT_SYMBOL_GPL(toi_get_zeroed_page);
+EXPORT_SYMBOL_GPL(toi_kfree);
+EXPORT_SYMBOL_GPL(toi_free_page);
+EXPORT_SYMBOL_GPL(toi__free_page);
+EXPORT_SYMBOL_GPL(toi_alloc_page);
+#endif
+#endif
diff --git a/kernel/power/tuxonice_alloc.h b/kernel/power/tuxonice_alloc.h
new file mode 100644
index 0000000..146c2bd
--- /dev/null
+++ b/kernel/power/tuxonice_alloc.h
@@ -0,0 +1,51 @@
+/*
+ * kernel/power/tuxonice_alloc.h
+ *
+ * Copyright (C) 2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ */
+
+#define TOI_WAIT_GFP (GFP_KERNEL | __GFP_NOWARN)
+#define TOI_ATOMIC_GFP (GFP_ATOMIC | __GFP_NOWARN)
+
+#ifdef CONFIG_PM_DEBUG
+extern void *toi_kzalloc(int fail_num, size_t size, gfp_t flags);
+extern void toi_kfree(int fail_num, const void *arg);
+
+extern unsigned long toi_get_free_pages(int fail_num, gfp_t mask,
+               unsigned int order);
+#define toi_get_free_page(FAIL_NUM, MASK) toi_get_free_pages(FAIL_NUM, MASK, 0)
+extern unsigned long toi_get_zeroed_page(int fail_num, gfp_t mask);
+extern void toi_free_page(int fail_num, unsigned long buf);
+extern void toi__free_page(int fail_num, struct page *page);
+extern void toi_free_pages(int fail_num, struct page *page, int order);
+extern struct page *toi_alloc_page(int fail_num, gfp_t mask);
+extern int toi_alloc_init(void);
+extern void toi_alloc_exit(void);
+
+extern void toi_alloc_print_debug_stats(void);
+
+#else /* CONFIG_PM_DEBUG */
+
+#define toi_kzalloc(FAIL, SIZE, FLAGS) (kzalloc(SIZE, FLAGS))
+#define toi_kfree(FAIL, ALLOCN) (kfree(ALLOCN))
+
+#define toi_get_free_pages(FAIL, FLAGS, ORDER) __get_free_pages(FLAGS, ORDER)
+#define toi_get_free_page(FAIL, FLAGS) __get_free_page(FLAGS)
+#define toi_get_zeroed_page(FAIL, FLAGS) get_zeroed_page(FLAGS)
+#define toi_free_page(FAIL, ALLOCN) do { free_page(ALLOCN); } while (0)
+#define toi__free_page(FAIL, PAGE) __free_page(PAGE)
+#define toi_free_pages(FAIL, PAGE, ORDER) __free_pages(PAGE, ORDER)
+#define toi_alloc_page(FAIL, MASK) alloc_page(MASK)
+static inline int toi_alloc_init(void)
+{
+       return 0;
+}
+
+static inline void toi_alloc_exit(void) { }
+
+static inline void toi_alloc_print_debug_stats(void) { }
+
+#endif
diff --git a/kernel/power/tuxonice_atomic_copy.c b/kernel/power/tuxonice_atomic_copy.c
new file mode 100644
index 0000000..e2f0c2a
--- /dev/null
+++ b/kernel/power/tuxonice_atomic_copy.c
@@ -0,0 +1,384 @@
+/*
+ * kernel/power/tuxonice_atomic_copy.c
+ *
+ * Copyright 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ * Copyright (C) 2006 Red Hat, inc.
+ *
+ * Distributed under GPLv2.
+ *
+ * Routines for doing the atomic save/restore.
+ */
+
+#include <linux/suspend.h>
+#include <linux/highmem.h>
+#include <linux/cpu.h>
+#include <linux/freezer.h>
+#include <linux/console.h>
+#include "tuxonice.h"
+#include "tuxonice_storage.h"
+#include "tuxonice_power_off.h"
+#include "tuxonice_ui.h"
+#include "power.h"
+#include "tuxonice_io.h"
+#include "tuxonice_prepare_image.h"
+#include "tuxonice_pageflags.h"
+#include "tuxonice_checksum.h"
+#include "tuxonice_builtin.h"
+#include "tuxonice_atomic_copy.h"
+#include "tuxonice_alloc.h"
+
+long extra_pd1_pages_used;
+
+/**
+ * free_pbe_list: Free page backup entries used by the atomic copy code.
+ *
+ * Normally, this function isn't used. If, however, we need to abort before
+ * doing the atomic copy, we use this to free the pbes previously allocated.
+ **/
+static void free_pbe_list(struct pbe **list, int highmem)
+{
+       while (*list) {
+               int i;
+               struct pbe *free_pbe, *next_page = NULL;
+               struct page *page;
+
+               if (highmem) {
+                       page = (struct page *) *list;
+                       free_pbe = (struct pbe *) kmap(page);
+               } else {
+                       page = virt_to_page(*list);
+                       free_pbe = *list;
+               }
+
+               for (i = 0; i < PBES_PER_PAGE; i++) {
+                       if (!free_pbe)
+                               break;
+                       if (highmem)
+                               toi__free_page(29, free_pbe->address);
+                       else
+                               toi_free_page(29,
+                                       (unsigned long) free_pbe->address);
+                       free_pbe = free_pbe->next;
+               }
+
+               if (highmem) {
+                       if (free_pbe)
+                               next_page = free_pbe;
+                       kunmap(page);
+               } else {
+                       if (free_pbe)
+                               next_page = free_pbe;
+               }
+
+               toi__free_page(29, page);
+               *list = (struct pbe *) next_page;
+       };
+}
+
+/**
+ * copyback_post: Post atomic-restore actions.
+ *
+ * After doing the atomic restore, we have a few more things to do:
+ * 1) We want to retain some values across the restore, so we now copy
+ * these from the nosave variables to the normal ones.
+ * 2) Set the status flags.
+ * 3) Resume devices.
+ * 4) Tell userui so it can redraw & restore settings.
+ * 5) Reread the page cache.
+ **/
+
+void copyback_post(void)
+{
+       struct toi_boot_kernel_data *bkd =
+               (struct toi_boot_kernel_data *) boot_kernel_data_buffer;
+
+       /*
+        * The boot kernel's data may be larger (newer version) or
+        * smaller (older version) than ours. Copy the minimum
+        * of the two sizes, so that we don't overwrite valid values
+        * from pre-atomic copy.
+        */
+
+       memcpy(&toi_bkd, (char *) boot_kernel_data_buffer,
+                       min_t(int, sizeof(struct toi_boot_kernel_data),
+                               bkd->size));
+
+       if (toi_activate_storage(1))
+               panic("Failed to reactivate our storage.");
+
+       toi_ui_post_atomic_restore();
+
+       toi_cond_pause(1, "About to reload secondary pagedir.");
+
+       if (read_pageset2(0))
+               panic("Unable to successfully reread the page cache.");
+
+       /*
+        * If the user wants to sleep again after resuming from full-off,
+        * it's most likely to be in order to suspend to ram, so we'll
+        * do this check after loading pageset2, to give them the fastest
+        * wakeup when they are ready to use the computer again.
+        */
+       toi_check_resleep();
+}
+
+/**
+ * toi_copy_pageset1: Do the atomic copy of pageset1.
+ *
+ * Make the atomic copy of pageset1. We can't use copy_page (as we once did)
+ * because we can't be sure what side effects it has. On my old Duron, with
+ * 3DNOW, kernel_fpu_begin increments preempt count, making our preempt
+ * count at resume time 4 instead of 3.
+ *
+ * We don't want to call kmap_atomic unconditionally because it has the side
+ * effect of incrementing the preempt count, which will leave it one too high
+ * post resume (the page containing the preempt count will be copied after
+ * its incremented. This is essentially the same problem.
+ **/
+
+void toi_copy_pageset1(void)
+{
+       int i;
+       unsigned long source_index, dest_index;
+
+       source_index = get_next_bit_on(&pageset1_map, max_pfn + 1);
+       dest_index = get_next_bit_on(&pageset1_copy_map, max_pfn + 1);
+
+       for (i = 0; i < pagedir1.size; i++) {
+               unsigned long *origvirt, *copyvirt;
+               struct page *origpage, *copypage;
+               int loop = (PAGE_SIZE / sizeof(unsigned long)) - 1,
+                   was_present;
+
+               origpage = pfn_to_page(source_index);
+               copypage = pfn_to_page(dest_index);
+
+               origvirt = PageHighMem(origpage) ?
+                       kmap_atomic(origpage, KM_USER0) :
+                       page_address(origpage);
+
+               copyvirt = PageHighMem(copypage) ?
+                       kmap_atomic(copypage, KM_USER1) :
+                       page_address(copypage);
+
+               was_present = kernel_page_present(origpage);
+               if (!was_present)
+                       kernel_map_pages(origpage, 1, 1);
+
+               while (loop >= 0) {
+                       *(copyvirt + loop) = *(origvirt + loop);
+                       loop--;
+               }
+
+               if (!was_present)
+                       kernel_map_pages(origpage, 1, 0);
+
+               if (PageHighMem(origpage))
+                       kunmap_atomic(origvirt, KM_USER0);
+
+               if (PageHighMem(copypage))
+                       kunmap_atomic(copyvirt, KM_USER1);
+
+               source_index = get_next_bit_on(&pageset1_map, source_index);
+               dest_index = get_next_bit_on(&pageset1_copy_map, dest_index);
+       }
+}
+
+/**
+ * __toi_post_context_save: Steps after saving the cpu context.
+ *
+ * Steps taken after saving the CPU state to make the actual
+ * atomic copy.
+ *
+ * Called from swsusp_save in snapshot.c via toi_post_context_save.
+ **/
+
+int __toi_post_context_save(void)
+{
+       long old_ps1_size = pagedir1.size;
+
+       check_checksums();
+
+       free_checksum_pages();
+
+       toi_recalculate_image_contents(1);
+
+       extra_pd1_pages_used = pagedir1.size - old_ps1_size;
+
+       if (extra_pd1_pages_used > extra_pd1_pages_allowance) {
+               printk(KERN_INFO "Pageset1 has grown by %ld pages. "
+                       "extra_pages_allowance is currently only %lu.\n",
+                       pagedir1.size - old_ps1_size,
+                       extra_pd1_pages_allowance);
+               set_abort_result(TOI_EXTRA_PAGES_ALLOW_TOO_SMALL);
+               return -1;
+       }
+
+       if (!test_action_state(TOI_TEST_FILTER_SPEED) &&
+           !test_action_state(TOI_TEST_BIO))
+               toi_copy_pageset1();
+
+       return 0;
+}
+
+/**
+ * toi_hibernate: High level code for doing the atomic copy.
+ *
+ * High-level code which prepares to do the atomic copy. Loosely based
+ * on the swsusp version, but with the following twists:
+ * - We set toi_running so the swsusp code uses our code paths.
+ * - We give better feedback regarding what goes wrong if there is a problem.
+ * - We use an extra function to call the assembly, just in case this code
+ *   is in a module (return address).
+ **/
+
+int toi_hibernate(void)
+{
+       int error;
+
+       toi_running = 1; /* For the swsusp code we use :< */
+
+       error = toi_lowlevel_builtin();
+
+       toi_running = 0;
+       return error;
+}
+
+/**
+ * toi_atomic_restore: Prepare to do the atomic restore.
+ *
+ * Get ready to do the atomic restore. This part gets us into the same
+ * state we are in prior to do calling do_toi_lowlevel while
+ * hibernating: hot-unplugging secondary cpus and freeze processes,
+ * before starting the thread that will do the restore.
+ **/
+
+int toi_atomic_restore(void)
+{
+       int error;
+
+       toi_running = 1;
+
+       toi_prepare_status(DONT_CLEAR_BAR,      "Atomic restore.");
+
+       if (add_boot_kernel_data_pbe())
+               goto Failed;
+
+       if (toi_go_atomic(PMSG_QUIESCE, 0))
+               goto Failed;
+
+       /* We'll ignore saved state, but this gets preempt count (etc) right */
+       save_processor_state();
+
+       error = swsusp_arch_resume();
+       /*
+        * Code below is only ever reached in case of failure. Otherwise
+        * execution continues at place where swsusp_arch_suspend was called.
+        *
+        * We don't know whether it's safe to continue (this shouldn't happen),
+        * so lets err on the side of caution.
+        */
+       BUG();
+
+Failed:
+       free_pbe_list(&restore_pblist, 0);
+#ifdef CONFIG_HIGHMEM
+       free_pbe_list(&restore_highmem_pblist, 1);
+#endif
+       if (test_action_state(TOI_PM_PREPARE_CONSOLE))
+               pm_restore_console();
+       toi_running = 0;
+       return 1;
+}
+
+int toi_go_atomic(pm_message_t state, int suspend_time)
+{
+       toi_prepare_status(DONT_CLEAR_BAR, "Doing atomic copy/restore.");
+
+       if (suspend_time && toi_platform_begin()) {
+               set_abort_result(TOI_PLATFORM_PREP_FAILED);
+               toi_end_atomic(ATOMIC_STEP_PLATFORM_END, suspend_time, 0);
+               return 1;
+       }
+
+       suspend_console();
+
+       if (device_suspend(state)) {
+               set_abort_result(TOI_DEVICE_REFUSED);
+               toi_end_atomic(ATOMIC_STEP_RESUME_CONSOLE, suspend_time, 1);
+               return 1;
+       }
+
+       if (suspend_time && toi_platform_pre_snapshot()) {
+               set_abort_result(TOI_PRE_SNAPSHOT_FAILED);
+               toi_end_atomic(ATOMIC_STEP_PLATFORM_FINISH, suspend_time, 0);
+               return 1;
+       }
+
+       if (!suspend_time && toi_platform_pre_restore()) {
+               set_abort_result(TOI_PRE_RESTORE_FAILED);
+               toi_end_atomic(ATOMIC_STEP_DEVICE_RESUME, suspend_time, 0);
+               return 1;
+       }
+
+       if (test_action_state(TOI_LATE_CPU_HOTPLUG)) {
+               if (disable_nonboot_cpus()) {
+                       set_abort_result(TOI_CPU_HOTPLUG_FAILED);
+                       toi_end_atomic(ATOMIC_STEP_CPU_HOTPLUG,
+                                       suspend_time, 0);
+                       return 1;
+               }
+       }
+
+       if (suspend_time && arch_prepare_suspend()) {
+               set_abort_result(TOI_ARCH_PREPARE_FAILED);
+               toi_end_atomic(ATOMIC_STEP_CPU_HOTPLUG, suspend_time, 0);
+               return 1;
+       }
+
+       device_pm_lock();
+       local_irq_disable();
+
+       /* At this point, device_suspend() has been called, but *not*
+        * device_power_down(). We *must* device_power_down() now.
+        * Otherwise, drivers for some devices (e.g. interrupt controllers)
+        * become desynchronized with the actual state of the hardware
+        * at resume time, and evil weirdness ensues.
+        */
+
+       if (device_power_down(state)) {
+               set_abort_result(TOI_DEVICE_REFUSED);
+               toi_end_atomic(ATOMIC_STEP_IRQS, suspend_time, 0);
+               return 1;
+       }
+
+       return 0;
+}
+
+void toi_end_atomic(int stage, int suspend_time, int error)
+{
+       switch (stage) {
+       case ATOMIC_ALL_STEPS:
+               if (!suspend_time)
+                       toi_platform_leave();
+               device_power_up(error ? PMSG_RECOVER :
+                       (suspend_time ? PMSG_THAW : PMSG_RESTORE));
+       case ATOMIC_STEP_IRQS:
+               local_irq_enable();
+               device_pm_unlock();
+       case ATOMIC_STEP_CPU_HOTPLUG:
+               if (test_action_state(TOI_LATE_CPU_HOTPLUG))
+                       enable_nonboot_cpus();
+       case ATOMIC_STEP_PLATFORM_FINISH:
+               toi_platform_finish();
+       case ATOMIC_STEP_DEVICE_RESUME:
+               device_resume(error ? PMSG_RECOVER :
+                       (suspend_time ? PMSG_THAW : PMSG_RESTORE));
+       case ATOMIC_STEP_RESUME_CONSOLE:
+               resume_console();
+       case ATOMIC_STEP_PLATFORM_END:
+               toi_platform_end();
+
+               toi_prepare_status(DONT_CLEAR_BAR, "Post atomic.");
+       }
+}
diff --git a/kernel/power/tuxonice_atomic_copy.h b/kernel/power/tuxonice_atomic_copy.h
new file mode 100644
index 0000000..7ec08a8
--- /dev/null
+++ b/kernel/power/tuxonice_atomic_copy.h
@@ -0,0 +1,22 @@
+/*
+ * kernel/power/tuxonice_atomic_copy.h
+ *
+ * Copyright 2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * Distributed under GPLv2.
+ *
+ * Routines for doing the atomic save/restore.
+ */
+
+enum {
+       ATOMIC_ALL_STEPS,
+       ATOMIC_STEP_IRQS,
+       ATOMIC_STEP_CPU_HOTPLUG,
+       ATOMIC_STEP_PLATFORM_FINISH,
+       ATOMIC_STEP_DEVICE_RESUME,
+       ATOMIC_STEP_RESUME_CONSOLE,
+       ATOMIC_STEP_PLATFORM_END,
+};
+
+int toi_go_atomic(pm_message_t state, int toi_time);
+void toi_end_atomic(int stage, int toi_time, int error);
diff --git a/kernel/power/tuxonice_block_io.c b/kernel/power/tuxonice_block_io.c
new file mode 100644
index 0000000..b018914
--- /dev/null
+++ b/kernel/power/tuxonice_block_io.c
@@ -0,0 +1,1193 @@
+/*
+ * kernel/power/tuxonice_block_io.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * Distributed under GPLv2.
+ *
+ * This file contains block io functions for TuxOnIce. These are
+ * used by the swapwriter and it is planned that they will also
+ * be used by the NFSwriter.
+ *
+ */
+
+#include <linux/blkdev.h>
+#include <linux/syscalls.h>
+#include <linux/suspend.h>
+
+#include "tuxonice.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_prepare_image.h"
+#include "tuxonice_block_io.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_alloc.h"
+#include "tuxonice_io.h"
+
+
+#if 0
+static int pr_index;
+
+static inline void reset_pr_index(void)
+{
+       pr_index = 0;
+}
+
+#define PR_DEBUG(a, b...) do { \
+       if (pr_index < 20) \
+               printk(a, ##b); \
+} while (0)
+
+static inline void inc_pr_index(void)
+{
+       pr_index++;
+}
+#else
+#define PR_DEBUG(a, b...) do { } while (0)
+#define reset_pr_index() do { } while (0)
+#define inc_pr_index do { } while (0)
+#endif
+
+#define TARGET_OUTSTANDING_IO 16384
+
+#define MEASURE_MUTEX_CONTENTION
+#ifndef MEASURE_MUTEX_CONTENTION
+#define my_mutex_lock(index, the_lock) mutex_lock(the_lock)
+#define my_mutex_unlock(index, the_lock) mutex_unlock(the_lock)
+#else
+unsigned long mutex_times[2][2][NR_CPUS];
+#define my_mutex_lock(index, the_lock) do { \
+       int have_mutex; \
+       have_mutex = mutex_trylock(the_lock); \
+       if (!have_mutex) { \
+               mutex_lock(the_lock); \
+               mutex_times[index][0][smp_processor_id()]++; \
+       } else { \
+               mutex_times[index][1][smp_processor_id()]++; \
+       }
+
+#define my_mutex_unlock(index, the_lock) \
+       mutex_unlock(the_lock); \
+} while (0)
+#endif
+
+static int target_outstanding_io = 1024;
+static int max_outstanding_writes, max_outstanding_reads;
+
+static struct page *bio_queue_head, *bio_queue_tail;
+static DEFINE_SPINLOCK(bio_queue_lock);
+
+static int free_mem_throttle;
+static int more_readahead = 1;
+static struct page *readahead_list_head, *readahead_list_tail;
+
+static struct page *waiting_on;
+
+static atomic_t toi_io_in_progress;
+static DECLARE_WAIT_QUEUE_HEAD(num_in_progress_wait);
+
+static int extra_page_forward;
+
+static int current_stream;
+/* 0 = Header, 1 = Pageset1, 2 = Pageset2, 3 = End of PS1 */
+struct hibernate_extent_iterate_saved_state toi_writer_posn_save[4];
+
+/* Pointer to current entry being loaded/saved. */
+struct hibernate_extent_iterate_state toi_writer_posn;
+
+/* Not static, so that the allocators can setup and complete
+ * writing the header */
+char *toi_writer_buffer;
+int toi_writer_buffer_posn;
+
+static struct toi_bdev_info *toi_devinfo;
+
+DEFINE_MUTEX(toi_bio_mutex);
+
+static struct task_struct *toi_queue_flusher;
+static int toi_bio_queue_flush_pages(int dedicated_thread);
+
+/**
+ * set_throttle: Set the point where we pause to avoid oom.
+ *
+ * Initially, this value is zero, but when we first fail to allocate memory,
+ * we set it (plus a buffer) and thereafter throttle i/o once that limit is
+ * reached.
+ */
+
+static void set_throttle(void)
+{
+       int new_throttle = nr_unallocated_buffer_pages() + 256;
+
+       if (new_throttle > free_mem_throttle)
+               free_mem_throttle = new_throttle;
+}
+
+#define NUM_REASONS 10
+static atomic_t reasons[NUM_REASONS];
+static char *reason_name[NUM_REASONS] = {
+       "readahead not ready",
+       "bio allocation",
+       "io_struct allocation",
+       "submit buffer",
+       "synchronous I/O",
+       "bio mutex when reading",
+       "bio mutex when writing",
+       "toi_bio_get_new_page",
+       "memory low",
+       "readahead buffer allocation"
+};
+
+/**
+ * do_bio_wait: Wait for some TuxOnIce i/o to complete.
+ *
+ * Submit any I/O that's batched up (if we're not already doing
+ * that, schedule and clean up whatever we can.
+ */
+static void do_bio_wait(int reason)
+{
+       struct page *was_waiting_on = waiting_on;
+
+       /* On SMP, waiting_on can be reset, so we make a copy */
+       if (was_waiting_on) {
+               if (PageLocked(was_waiting_on)) {
+                       wait_on_page_bit(was_waiting_on, PG_locked);
+                       atomic_inc(&reasons[reason]);
+               }
+       } else {
+               atomic_inc(&reasons[reason]);
+
+               wait_event(num_in_progress_wait,
+                       !atomic_read(&toi_io_in_progress) ||
+                       nr_unallocated_buffer_pages() > free_mem_throttle);
+       }
+}
+
+static void throttle_if_memory_low(void)
+{
+       int free_pages = nr_unallocated_buffer_pages();
+
+       /* Getting low on memory and I/O is in progress? */
+       while (unlikely(free_pages < free_mem_throttle) &&
+                       atomic_read(&toi_io_in_progress)) {
+               do_bio_wait(8);
+               free_pages = nr_unallocated_buffer_pages();
+       }
+}
+
+/**
+ * toi_finish_all_io: Complete all outstanding i/o.
+ */
+static void toi_finish_all_io(void)
+{
+       wait_event(num_in_progress_wait, !atomic_read(&toi_io_in_progress));
+}
+
+/**
+ * toi_end_bio: bio completion function.
+ *
+ * @bio: bio that has completed.
+ * @err: Error value. Yes, like end_swap_bio_read, we ignore it.
+ *
+ * Function called by block driver from interrupt context when I/O is completed.
+ * Nearly the fs/buffer.c version, but we want to do our cleanup too. We only
+ * free pages if they were buffers used when writing the image.
+ */
+static void toi_end_bio(struct bio *bio, int err)
+{
+       struct page *page = bio->bi_io_vec[0].bv_page;
+
+       BUG_ON(!test_bit(BIO_UPTODATE, &bio->bi_flags));
+
+       unlock_page(page);
+       bio_put(bio);
+
+       if (waiting_on == page)
+               waiting_on = NULL;
+
+       put_page(page);
+
+       if (bio->bi_private)
+               toi__free_page((int) ((unsigned long) bio->bi_private) , page);
+
+       bio_put(bio);
+
+       atomic_dec(&toi_io_in_progress);
+
+       wake_up(&num_in_progress_wait);
+}
+
+/**
+ *     submit - submit BIO request.
+ *     @writing: READ or WRITE.
+ *
+ *     Based on Patrick's pmdisk code from long ago:
+ *     "Straight from the textbook - allocate and initialize the bio.
+ *     If we're writing, make sure the page is marked as dirty.
+ *     Then submit it and carry on."
+ *
+ *     With a twist, though - we handle block_size != PAGE_SIZE.
+ *     Caller has already checked that our page is not fragmented.
+ */
+static int submit(int writing, struct block_device *dev, sector_t first_block,
+               struct page *page, int free_group)
+{
+       struct bio *bio = NULL;
+       int cur_outstanding_io;
+
+       throttle_if_memory_low();
+
+       while (!bio) {
+               bio = bio_alloc(TOI_ATOMIC_GFP, 1);
+               if (!bio) {
+                       set_throttle();
+                       do_bio_wait(1);
+               }
+       }
+
+       bio->bi_bdev = dev;
+       bio->bi_sector = first_block;
+       bio->bi_private = (void *) ((unsigned long) free_group);
+       bio->bi_end_io = toi_end_bio;
+
+       if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
+               printk(KERN_INFO "ERROR: adding page to bio at %lld\n",
+                               (unsigned long long) first_block);
+               bio_put(bio);
+               return -EFAULT;
+       }
+
+       bio_get(bio);
+
+       cur_outstanding_io = atomic_add_return(1, &toi_io_in_progress);
+       if (writing) {
+               if (cur_outstanding_io > max_outstanding_writes)
+                       max_outstanding_writes = cur_outstanding_io;
+       } else {
+               if (cur_outstanding_io > max_outstanding_reads)
+                       max_outstanding_reads = cur_outstanding_io;
+       }
+
+
+       if (unlikely(test_action_state(TOI_TEST_FILTER_SPEED))) {
+               /* Fake having done the hard work */
+               set_bit(BIO_UPTODATE, &bio->bi_flags);
+               toi_end_bio(bio, 0);
+       } else
+               submit_bio(writing | (1 << BIO_RW_SYNC), bio);
+
+       return 0;
+}
+
+/**
+ * toi_do_io: Prepare to do some i/o on a page and submit or batch it.
+ *
+ * @writing: Whether reading or writing.
+ * @bdev: The block device which we're using.
+ * @block0: The first sector we're reading or writing.
+ * @page: The page on which I/O is being done.
+ * @readahead_index: If doing readahead, the index (reset this flag when done).
+ * @syncio: Whether the i/o is being done synchronously.
+ *
+ * Prepare and start a read or write operation.
+ *
+ * Note that we always work with our own page. If writing, we might be given a
+ * compression buffer that will immediately be used to start compressing the
+ * next page. For reading, we do readahead and therefore don't know the final
+ * address where the data needs to go.
+ */
+static int toi_do_io(int writing, struct block_device *bdev, long block0,
+       struct page *page, int is_readahead, int syncio, int free_group)
+{
+       page->private = 0;
+
+       /* Do here so we don't race against toi_bio_get_next_page_read */
+       lock_page(page);
+
+       if (is_readahead) {
+               if (readahead_list_head)
+                       readahead_list_tail->private = (unsigned long) page;
+               else
+                       readahead_list_head = page;
+
+               readahead_list_tail = page;
+       }
+
+       /* Done before submitting to avoid races. */
+       if (syncio)
+               waiting_on = page;
+
+       /* Submit the page */
+       get_page(page);
+
+       if (submit(writing, bdev, block0, page, free_group))
+               return -EFAULT;
+
+       if (syncio)
+               do_bio_wait(4);
+
+       return 0;
+}
+
+/**
+ * toi_bdev_page_io: Simpler interface to do directly i/o on a single page.
+ *
+ * @writing: Whether reading or writing.
+ * @bdev: Block device on which we're operating.
+ * @pos: Sector at which page to read starts.
+ * @page: Page to be read/written.
+ *
+ * We used to use bread here, but it doesn't correctly handle
+ * blocksize != PAGE_SIZE. Now we create a submit_info to get the data we
+ * want and use our normal routines (synchronously).
+ */
+static int toi_bdev_page_io(int writing, struct block_device *bdev,
+               long pos, struct page *page)
+{
+       return toi_do_io(writing, bdev, pos, page, 0, 1, 0);
+}
+
+/**
+ * toi_bio_memory_needed: Report amount of memory needed for block i/o.
+ *
+ * We want to have at least enough memory so as to have target_outstanding_io
+ * or more transactions on the fly at once. If we can do more, fine.
+ */
+static int toi_bio_memory_needed(void)
+{
+       return target_outstanding_io * (PAGE_SIZE + sizeof(struct request) +
+                               sizeof(struct bio));
+}
+
+/*
+ * toi_bio_print_debug_stats
+ *
+ * Description:
+ */
+static int toi_bio_print_debug_stats(char *buffer, int size)
+{
+       int len = snprintf_used(buffer, size, "- Max outstanding reads %d. Max "
+                       "writes %d.\n", max_outstanding_reads,
+                       max_outstanding_writes);
+
+       len += snprintf_used(buffer + len, size - len,
+               "  Memory_needed: %d x (%lu + %u + %u) = %d bytes.\n",
+               target_outstanding_io,
+               PAGE_SIZE, (unsigned int) sizeof(struct request),
+               (unsigned int) sizeof(struct bio), toi_bio_memory_needed());
+
+#ifdef MEASURE_MUTEX_CONTENTION
+       {
+       int i;
+
+       len += snprintf_used(buffer + len, size - len,
+               "  Mutex contention while reading:\n  Contended      Free\n");
+
+       for_each_online_cpu(i)
+               len += snprintf_used(buffer + len, size - len,
+               "  %9lu %9lu\n",
+               mutex_times[0][0][i], mutex_times[0][1][i]);
+
+       len += snprintf_used(buffer + len, size - len,
+               "  Mutex contention while writing:\n  Contended      Free\n");
+
+       for_each_online_cpu(i)
+               len += snprintf_used(buffer + len, size - len,
+               "  %9lu %9lu\n",
+               mutex_times[1][0][i], mutex_times[1][1][i]);
+
+       }
+#endif
+
+       return len + snprintf_used(buffer + len, size - len,
+               "  Free mem throttle point reached %d.\n", free_mem_throttle);
+}
+
+/**
+ * toi_set_devinfo: Set the bdev info used for i/o.
+ *
+ * @info: Pointer to array of struct toi_bdev_info - the list of
+ * bdevs and blocks on them in which the image is stored.
+ *
+ * Set the list of bdevs and blocks in which the image will be stored.
+ * Sort of like putting a tape in the cassette player.
+ */
+static void toi_set_devinfo(struct toi_bdev_info *info)
+{
+       toi_devinfo = info;
+}
+
+/**
+ * dump_block_chains: Print the contents of the bdev info array.
+ */
+static void dump_block_chains(void)
+{
+       int i;
+
+       for (i = 0; i < toi_writer_posn.num_chains; i++) {
+               struct hibernate_extent *this;
+
+               this = (toi_writer_posn.chains + i)->first;
+
+               if (!this)
+                       continue;
+
+               printk(KERN_INFO "Chain %d:", i);
+
+               while (this) {
+                       printk(" [%lu-%lu]%s", this->start,
+                                       this->end, this->next ? "," : "");
+                       this = this->next;
+               }
+
+               printk("\n");
+       }
+
+       for (i = 0; i < 4; i++)
+               printk(KERN_INFO "Posn %d: Chain %d, extent %d, offset %lu.\n",
+                               i, toi_writer_posn_save[i].chain_num,
+                               toi_writer_posn_save[i].extent_num,
+                               toi_writer_posn_save[i].offset);
+}
+
+/**
+ * go_next_page: Skip blocks to the start of the next page.
+ *
+ * Go forward one page, or two if extra_page_forward is set. It only gets
+ * set at the start of reading the image header, to skip the first page
+ * of the header, which is read without using the extent chains.
+ */
+static int go_next_page(int writing)
+{
+       int i, max = (toi_writer_posn.current_chain == -1) ? 1 :
+         toi_devinfo[toi_writer_posn.current_chain].blocks_per_page;
+
+       for (i = 0; i < max; i++)
+               toi_extent_state_next(&toi_writer_posn);
+
+       if (toi_extent_state_eof(&toi_writer_posn)) {
+               /* Don't complain if readahead falls off the end */
+               if (writing) {
+                       printk(KERN_INFO "Extent state eof. "
+                               "Expected compression ratio too optimistic?\n");
+                       dump_block_chains();
+               }
+               return -ENODATA;
+       }
+
+       if (extra_page_forward) {
+               extra_page_forward = 0;
+               return go_next_page(writing);
+       }
+
+       return 0;
+}
+
+/**
+ * set_extra_page_forward: Make us skip an extra page on next go_next_page.
+ *
+ * Used in reading header, to jump to 2nd page after getting 1st page
+ * direct from image header.
+ */
+static void set_extra_page_forward(void)
+{
+       extra_page_forward = 1;
+}
+
+/**
+ * toi_bio_rw_page: Do i/o on the next disk page in the image.
+ *
+ * @writing: Whether reading or writing.
+ * @page: Page to do i/o on.
+ * @readahead_index: -1 or the index in the readahead ring.
+ *
+ * Submit a page for reading or writing, possibly readahead.
+ */
+static int toi_bio_rw_page(int writing, struct page *page,
+               int is_readahead, int free_group)
+{
+       struct toi_bdev_info *dev_info;
+       int result;
+
+       if (go_next_page(writing)) {
+               printk(KERN_INFO "Failed to advance a page in the extent "
+                               "data.\n");
+               return -ENODATA;
+       }
+
+       if (current_stream == 0 && writing &&
+               toi_writer_posn.current_chain ==
+                       toi_writer_posn_save[2].chain_num &&
+               toi_writer_posn.current_offset ==
+                       toi_writer_posn_save[2].offset) {
+               dump_block_chains();
+               BUG();
+       }
+
+       dev_info = &toi_devinfo[toi_writer_posn.current_chain];
+
+       result = toi_do_io(writing, dev_info->bdev,
+               toi_writer_posn.current_offset <<
+                       dev_info->bmap_shift,
+               page, is_readahead, 0, free_group);
+
+       if (result) {
+               more_readahead = 0;
+               return result;
+       }
+
+       if (!writing) {
+               int compare_to = 0;
+
+               switch (current_stream) {
+               case 0:
+                       compare_to = 2;
+                       break;
+               case 1:
+                       compare_to = 3;
+                       break;
+               case 2:
+                       compare_to = 1;
+                       break;
+               }
+
+               if (toi_writer_posn.current_chain ==
+                               toi_writer_posn_save[compare_to].chain_num &&
+                   toi_writer_posn.current_offset ==
+                               toi_writer_posn_save[compare_to].offset)
+                       more_readahead = 0;
+       }
+       return 0;
+}
+
+/**
+ * toi_rw_init: Prepare to read or write a stream in the image.
+ *
+ * @writing: Whether reading or writing.
+ * @stream number: Section of the image being processed.
+ */
+static int toi_rw_init(int writing, int stream_number)
+{
+       if (stream_number)
+               toi_extent_state_restore(&toi_writer_posn,
+                               &toi_writer_posn_save[stream_number]);
+       else
+               toi_extent_state_goto_start(&toi_writer_posn);
+
+       toi_writer_buffer = (char *) toi_get_zeroed_page(11, TOI_ATOMIC_GFP);
+       toi_writer_buffer_posn = writing ? 0 : PAGE_SIZE;
+
+       current_stream = stream_number;
+
+       reset_pr_index();
+       more_readahead = 1;
+
+       return toi_writer_buffer ? 0 : -ENOMEM;
+}
+
+/**
+ * toi_read_header_init: Prepare to read the image header.
+ *
+ * Reset readahead indices prior to starting to read a section of the image.
+ */
+static void toi_read_header_init(void)
+{
+       toi_writer_buffer = (char *) toi_get_zeroed_page(11, TOI_ATOMIC_GFP);
+       more_readahead = 1;
+}
+
+/*
+ * toi_bio_queue_write
+ */
+static void toi_bio_queue_write(char **full_buffer)
+{
+       struct page *page = virt_to_page(*full_buffer);
+       unsigned long flags;
+
+       page->private = 0;
+
+       spin_lock_irqsave(&bio_queue_lock, flags);
+       if (!bio_queue_head)
+               bio_queue_head = page;
+       else
+               bio_queue_tail->private = (unsigned long) page;
+
+       bio_queue_tail = page;
+
+       spin_unlock_irqrestore(&bio_queue_lock, flags);
+       wake_up(&toi_io_queue_flusher);
+
+       *full_buffer = NULL;
+}
+
+/**
+ * toi_rw_cleanup: Cleanup after i/o.
+ *
+ * @writing: Whether we were reading or writing.
+ */
+static int toi_rw_cleanup(int writing)
+{
+       int i;
+
+       if (writing) {
+               int result;
+
+               if (toi_writer_buffer_posn)
+                       toi_bio_queue_write(&toi_writer_buffer);
+
+               result = toi_bio_queue_flush_pages(0);
+
+               if (result)
+                       return result;
+
+               if (current_stream == 2)
+                       toi_extent_state_save(&toi_writer_posn,
+                                       &toi_writer_posn_save[1]);
+               else if (current_stream == 1)
+                       toi_extent_state_save(&toi_writer_posn,
+                                       &toi_writer_posn_save[3]);
+       }
+
+       toi_finish_all_io();
+
+       while (readahead_list_head) {
+               void *next = (void *) readahead_list_head->private;
+               toi__free_page(12, readahead_list_head);
+               readahead_list_head = next;
+       }
+
+       readahead_list_tail = NULL;
+
+       if (!current_stream)
+               return 0;
+
+       for (i = 0; i < NUM_REASONS; i++) {
+               if (!atomic_read(&reasons[i]))
+                       continue;
+               printk(KERN_INFO "Waited for i/o due to %s %d times.\n",
+                               reason_name[i], atomic_read(&reasons[i]));
+               atomic_set(&reasons[i], 0);
+       }
+
+       current_stream = 0;
+       return 0;
+}
+
+int toi_start_one_readahead(int dedicated_thread)
+{
+       char *buffer = NULL;
+       int oom = 0;
+
+       throttle_if_memory_low();
+
+       while (!buffer) {
+               buffer = (char *) toi_get_zeroed_page(12,
+                               TOI_ATOMIC_GFP);
+               if (!buffer) {
+                       if (oom && !dedicated_thread)
+                               return -EIO;
+
+                       oom = 1;
+                       set_throttle();
+                       do_bio_wait(9);
+               }
+       }
+
+       return toi_bio_rw_page(READ, virt_to_page(buffer), 1, 0);
+}
+
+/*
+ * toi_start_new_readahead
+ *
+ * Start readahead of image pages.
+ *
+ * No mutex needed because this is only ever called by one cpu.
+ */
+static int toi_start_new_readahead(int dedicated_thread)
+{
+       int last_result, num_submitted = 0;
+
+       /* Start a new readahead? */
+       if (!more_readahead)
+               return 0;
+
+       do {
+               int result = toi_start_one_readahead(dedicated_thread);
+
+               if (result == -EIO)
+                       return 0;
+               else
+                       last_result = result;
+
+               if (last_result == -ENODATA)
+                       more_readahead = 0;
+
+               if (!more_readahead && last_result) {
+                       /*
+                        * Don't complain about failing to do readahead past
+                        * the end of storage.
+                        */
+                       if (last_result != -ENODATA)
+                               printk(KERN_INFO
+                                       "Begin read chunk returned %d.\n",
+                                       last_result);
+               } else
+                       num_submitted++;
+
+       } while (more_readahead &&
+                (dedicated_thread ||
+                 (num_submitted < target_outstanding_io &&
+                  atomic_read(&toi_io_in_progress) < target_outstanding_io)));
+       return 0;
+}
+
+static void bio_io_flusher(int writing)
+{
+
+       if (writing)
+               toi_bio_queue_flush_pages(1);
+       else
+               toi_start_new_readahead(1);
+}
+
+/**
+ * toi_bio_get_next_page_read: Read a disk page with readahead.
+ *
+ * Read a page from disk, submitting readahead and cleaning up finished i/o
+ * while we wait for the page we're after.
+ */
+static int toi_bio_get_next_page_read(int no_readahead)
+{
+       unsigned long *virt;
+       struct page *next;
+
+       /*
+        * When reading the second page of the header, we have to
+        * delay submitting the read until after we've gotten the
+        * extents out of the first page.
+        */
+       if (unlikely(no_readahead && toi_start_one_readahead(0))) {
+               printk(KERN_INFO "No readahead and toi_start_one_readahead "
+                               "returned non-zero.\n");
+               return -EIO;
+       }
+
+       /*
+        * On SMP, we may need to wait for the first readahead
+        * to be submitted.
+        */
+       if (unlikely(!readahead_list_head)) {
+               BUG_ON(!more_readahead);
+               do {
+                       cpu_relax();
+               } while (!readahead_list_head);
+       }
+
+       if (PageLocked(readahead_list_head)) {
+               waiting_on = readahead_list_head;
+               do_bio_wait(0);
+       }
+
+       virt = page_address(readahead_list_head);
+       memcpy(toi_writer_buffer, virt, PAGE_SIZE);
+
+       next = (struct page *) readahead_list_head->private;
+       toi__free_page(12, readahead_list_head);
+       readahead_list_head = next;
+       return 0;
+}
+
+/*
+ * toi_bio_queue_flush_pages
+ */
+
+static int toi_bio_queue_flush_pages(int dedicated_thread)
+{
+       unsigned long flags;
+       int result = 0;
+
+top:
+       spin_lock_irqsave(&bio_queue_lock, flags);
+       while (bio_queue_head) {
+               struct page *page = bio_queue_head;
+               bio_queue_head = (struct page *) page->private;
+               if (bio_queue_tail == page)
+                       bio_queue_tail = NULL;
+               spin_unlock_irqrestore(&bio_queue_lock, flags);
+               result = toi_bio_rw_page(WRITE, page, 0, 11);
+               if (result)
+                       return result;
+               spin_lock_irqsave(&bio_queue_lock, flags);
+       }
+       spin_unlock_irqrestore(&bio_queue_lock, flags);
+
+       if (dedicated_thread) {
+               wait_event(toi_io_queue_flusher, bio_queue_head ||
+                               toi_bio_queue_flusher_should_finish);
+               if (likely(!toi_bio_queue_flusher_should_finish))
+                       goto top;
+               toi_bio_queue_flusher_should_finish = 0;
+       }
+       return 0;
+}
+
+/*
+ * toi_bio_get_new_page
+ */
+static void toi_bio_get_new_page(char **full_buffer)
+{
+       throttle_if_memory_low();
+
+       while (!*full_buffer) {
+               *full_buffer = (char *) toi_get_zeroed_page(11, TOI_ATOMIC_GFP);
+               if (!*full_buffer) {
+                       set_throttle();
+                       do_bio_wait(7);
+               }
+       }
+}
+
+/*
+ * toi_rw_buffer: Combine smaller buffers into PAGE_SIZE I/O.
+ *
+ * @writing: Bool - whether writing (or reading).
+ * @buffer: The start of the buffer to write or fill.
+ * @buffer_size: The size of the buffer to write or fill.
+ */
+static int toi_rw_buffer(int writing, char *buffer, int buffer_size,
+               int no_readahead)
+{
+       int bytes_left = buffer_size;
+
+       while (bytes_left) {
+               char *source_start = buffer + buffer_size - bytes_left;
+               char *dest_start = toi_writer_buffer + toi_writer_buffer_posn;
+               int capacity = PAGE_SIZE - toi_writer_buffer_posn;
+               char *to = writing ? dest_start : source_start;
+               char *from = writing ? source_start : dest_start;
+
+               if (bytes_left <= capacity) {
+                       memcpy(to, from, bytes_left);
+                       toi_writer_buffer_posn += bytes_left;
+                       return 0;
+               }
+
+               /* Complete this page and start a new one */
+               memcpy(to, from, capacity);
+               bytes_left -= capacity;
+
+               if (!writing) {
+                       int result = toi_bio_get_next_page_read(no_readahead);
+                       if (result)
+                               return result;
+               } else {
+                       toi_bio_queue_write(&toi_writer_buffer);
+                       toi_bio_get_new_page(&toi_writer_buffer);
+               }
+
+               toi_writer_buffer_posn = 0;
+               toi_cond_pause(0, NULL);
+       }
+
+       return 0;
+}
+
+/**
+ * toi_bio_read_page - read a page of the image.
+ *
+ * @pfn: The pfn where the data belongs.
+ * @buffer_page: The page containing the (possibly compressed) data.
+ * @buf_size: The number of bytes on @buffer_page used.
+ *
+ * Read a (possibly compressed) page from the image, into buffer_page,
+ * returning its pfn and the buffer size.
+ */
+static int toi_bio_read_page(unsigned long *pfn, struct page *buffer_page,
+               unsigned int *buf_size)
+{
+       int result = 0;
+       char *buffer_virt = kmap(buffer_page);
+
+       inc_pr_index;
+
+       /* Only call start_new_readahead if we don't have a dedicated thread */
+       if (current == toi_queue_flusher && toi_start_new_readahead(0)) {
+               printk(KERN_INFO "Queue flusher and toi_start_one_readahead "
+                               "returned non-zero.\n");
+               return -EIO;
+       }
+
+       my_mutex_lock(0, &toi_bio_mutex);
+
+       if (toi_rw_buffer(READ, (char *) pfn, sizeof(unsigned long), 0) ||
+           toi_rw_buffer(READ, (char *) buf_size, sizeof(int), 0) ||
+           toi_rw_buffer(READ, buffer_virt, *buf_size, 0)) {
+               abort_hibernate(TOI_FAILED_IO, "Read of data failed.");
+               result = 1;
+       } else
+               PR_DEBUG("%d: PFN %ld, %d bytes.\n", pr_index, *pfn, *buf_size);
+
+       my_mutex_unlock(0, &toi_bio_mutex);
+       kunmap(buffer_page);
+       return result;
+}
+
+/**
+ * toi_bio_write_page - Write a page of the image.
+ *
+ * @pfn: The pfn where the data belongs.
+ * @buffer_page: The page containing the (possibly compressed) data.
+ * @buf_size: The number of bytes on @buffer_page used.
+ *
+ * Write a (possibly compressed) page to the image from the buffer, together
+ * with it's index and buffer size.
+ */
+static int toi_bio_write_page(unsigned long pfn, struct page *buffer_page,
+               unsigned int buf_size)
+{
+       char *buffer_virt;
+       int result = 0, result2 = 0;
+
+       inc_pr_index;
+
+       if (unlikely(test_action_state(TOI_TEST_FILTER_SPEED)))
+               return 0;
+
+       my_mutex_lock(1, &toi_bio_mutex);
+       buffer_virt = kmap(buffer_page);
+
+       if (toi_rw_buffer(WRITE, (char *) &pfn, sizeof(unsigned long), 0) ||
+           toi_rw_buffer(WRITE, (char *) &buf_size, sizeof(int), 0) ||
+           toi_rw_buffer(WRITE, buffer_virt, buf_size, 0)) {
+               printk(KERN_INFO "toi_rw_buffer returned non-zero to "
+                               "toi_bio_write_page.\n");
+               result = -EIO;
+       }
+
+       PR_DEBUG("%d: Index %ld, %d bytes. Result %d.\n", pr_index, pfn,
+                       buf_size, result);
+
+       kunmap(buffer_page);
+       my_mutex_unlock(1, &toi_bio_mutex);
+
+       if (current == toi_queue_flusher)
+               result2 = toi_bio_queue_flush_pages(0);
+
+       return result ? result : result2;
+}
+
+/**
+ * toi_rw_header_chunk: Read or write a portion of the image header.
+ *
+ * @writing: Whether reading or writing.
+ * @owner: The module for which we're writing. Used for confirming that modules
+ * don't use more header space than they asked for.
+ * @buffer: Address of the data to write.
+ * @buffer_size: Size of the data buffer.
+ * @no_readahead: Don't try to start readhead (when still getting extents)
+ */
+static int _toi_rw_header_chunk(int writing, struct toi_module_ops *owner,
+               char *buffer, int buffer_size, int no_readahead)
+{
+       int result = 0;
+
+       if (owner) {
+               owner->header_used += buffer_size;
+               toi_message(TOI_HEADER, TOI_LOW, 1,
+                       "Header: %s : %d bytes (%d/%d).\n",
+                       buffer_size, owner->header_used,
+                       owner->header_requested);
+               if (owner->header_used > owner->header_requested) {
+                       printk(KERN_EMERG "TuxOnIce module %s is using more "
+                               "header space (%u) than it requested (%u).\n",
+                               owner->name,
+                               owner->header_used,
+                               owner->header_requested);
+                       return buffer_size;
+               }
+       } else
+               toi_message(TOI_HEADER, TOI_LOW, 1,
+                       "Header: (No owner): %d bytes.\n", buffer_size);
+
+       if (!writing && !no_readahead)
+               result = toi_start_new_readahead(0);
+
+       if (!result)
+               result = toi_rw_buffer(writing, buffer, buffer_size,
+                               no_readahead);
+
+       return result;
+}
+
+static int toi_rw_header_chunk(int writing, struct toi_module_ops *owner,
+               char *buffer, int size)
+{
+       return _toi_rw_header_chunk(writing, owner, buffer, size, 0);
+}
+
+static int toi_rw_header_chunk_noreadahead(int writing,
+               struct toi_module_ops *owner, char *buffer, int size)
+{
+       return _toi_rw_header_chunk(writing, owner, buffer, size, 1);
+}
+
+/**
+ * write_header_chunk_finish: Flush any buffered header data.
+ */
+static int write_header_chunk_finish(void)
+{
+       int result = 0;
+
+       if (toi_writer_buffer_posn)
+               toi_bio_queue_write(&toi_writer_buffer);
+
+       toi_bio_queue_flush_pages(0);
+       toi_finish_all_io();
+
+       return result;
+}
+
+/**
+ * toi_bio_storage_needed: Get the amount of storage needed for my fns.
+ */
+static int toi_bio_storage_needed(void)
+{
+       return 2 * sizeof(int);
+}
+
+/**
+ * toi_bio_save_config_info: Save block i/o config to image header.
+ *
+ * @buf: PAGE_SIZE'd buffer into which data should be saved.
+ */
+static int toi_bio_save_config_info(char *buf)
+{
+       int *ints = (int *) buf;
+       ints[0] = target_outstanding_io;
+       return sizeof(int);
+}
+
+/**
+ * toi_bio_load_config_info: Restore block i/o config.
+ *
+ * @buf: Data to be reloaded.
+ * @size: Size of the buffer saved.
+ */
+static void toi_bio_load_config_info(char *buf, int size)
+{
+       int *ints = (int *) buf;
+       target_outstanding_io  = ints[0];
+}
+
+/**
+ * toi_bio_initialise: Initialise bio code at start of some action.
+ *
+ * @starting_cycle: Whether starting a hibernation cycle, or just reading or
+ * writing a sysfs value.
+ */
+static int toi_bio_initialise(int starting_cycle)
+{
+       if (starting_cycle) {
+               max_outstanding_writes = 0;
+               max_outstanding_reads = 0;
+               toi_queue_flusher = current;
+#ifdef MEASURE_MUTEX_CONTENTION
+               {
+               int i, j, k;
+
+               for (i = 0; i < 2; i++)
+                       for (j = 0; j < 2; j++)
+                               for_each_online_cpu(k)
+                                       mutex_times[i][j][k] = 0;
+               }
+#endif
+       }
+
+       return 0;
+}
+
+/**
+ * toi_bio_cleanup: Cleanup after some action.
+ *
+ * @finishing_cycle: Whether completing a cycle.
+ */
+static void toi_bio_cleanup(int finishing_cycle)
+{
+       if (toi_writer_buffer) {
+               toi_free_page(11, (unsigned long) toi_writer_buffer);
+               toi_writer_buffer = NULL;
+       }
+}
+
+struct toi_bio_ops toi_bio_ops = {
+       .bdev_page_io = toi_bdev_page_io,
+       .finish_all_io = toi_finish_all_io,
+       .forward_one_page = go_next_page,
+       .set_extra_page_forward = set_extra_page_forward,
+       .set_devinfo = toi_set_devinfo,
+       .read_page = toi_bio_read_page,
+       .write_page = toi_bio_write_page,
+       .rw_init = toi_rw_init,
+       .rw_cleanup = toi_rw_cleanup,
+       .read_header_init = toi_read_header_init,
+       .rw_header_chunk = toi_rw_header_chunk,
+       .rw_header_chunk_noreadahead = toi_rw_header_chunk_noreadahead,
+       .write_header_chunk_finish = write_header_chunk_finish,
+       .io_flusher = bio_io_flusher,
+};
+
+static struct toi_sysfs_data sysfs_params[] = {
+       { TOI_ATTR("target_outstanding_io", SYSFS_RW),
+         SYSFS_INT(&target_outstanding_io, 0, TARGET_OUTSTANDING_IO, 0),
+       }
+};
+
+static struct toi_module_ops toi_blockwriter_ops = {
+       .name                                   = "lowlevel i/o",
+       .type                                   = MISC_HIDDEN_MODULE,
+       .directory                              = "block_io",
+       .module                                 = THIS_MODULE,
+       .print_debug_info                       = toi_bio_print_debug_stats,
+       .memory_needed                          = toi_bio_memory_needed,
+       .storage_needed                         = toi_bio_storage_needed,
+       .save_config_info                       = toi_bio_save_config_info,
+       .load_config_info                       = toi_bio_load_config_info,
+       .initialise                             = toi_bio_initialise,
+       .cleanup                                = toi_bio_cleanup,
+
+       .sysfs_data             = sysfs_params,
+       .num_sysfs_entries      = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+/**
+ * toi_block_io_load: Load time routine for block i/o module.
+ *
+ * Register block i/o ops and sysfs entries.
+ */
+static __init int toi_block_io_load(void)
+{
+       return toi_register_module(&toi_blockwriter_ops);
+}
+
+#if defined(CONFIG_TOI_FILE_EXPORTS) || defined(CONFIG_TOI_SWAP_EXPORTS)
+EXPORT_SYMBOL_GPL(toi_writer_posn);
+EXPORT_SYMBOL_GPL(toi_writer_posn_save);
+EXPORT_SYMBOL_GPL(toi_writer_buffer);
+EXPORT_SYMBOL_GPL(toi_writer_buffer_posn);
+EXPORT_SYMBOL_GPL(toi_bio_ops);
+#endif
+#ifdef MODULE
+static __exit void toi_block_io_unload(void)
+{
+       toi_unregister_module(&toi_blockwriter_ops);
+}
+
+module_init(toi_block_io_load);
+module_exit(toi_block_io_unload);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("TuxOnIce block io functions");
+#else
+late_initcall(toi_block_io_load);
+#endif
diff --git a/kernel/power/tuxonice_block_io.h b/kernel/power/tuxonice_block_io.h
new file mode 100644
index 0000000..54b72ca
--- /dev/null
+++ b/kernel/power/tuxonice_block_io.h
@@ -0,0 +1,57 @@
+/*
+ * kernel/power/tuxonice_block_io.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ * Copyright (C) 2006 Red Hat, inc.
+ *
+ * Distributed under GPLv2.
+ *
+ * This file contains declarations for functions exported from
+ * tuxonice_block_io.c, which contains low level io functions.
+ */
+
+#include <linux/buffer_head.h>
+#include "tuxonice_extent.h"
+
+struct toi_bdev_info {
+       struct block_device *bdev;
+       dev_t dev_t;
+       int bmap_shift;
+       int blocks_per_page;
+};
+
+/*
+ * Our exported interface so the swapwriter and filewriter don't
+ * need these functions duplicated.
+ */
+struct toi_bio_ops {
+       int (*bdev_page_io) (int rw, struct block_device *bdev, long pos,
+                       struct page *page);
+       void (*check_io_stats) (void);
+       void (*reset_io_stats) (void);
+       void (*finish_all_io) (void);
+       int (*forward_one_page) (int writing);
+       void (*set_extra_page_forward) (void);
+       void (*set_devinfo) (struct toi_bdev_info *info);
+       int (*read_page) (unsigned long *index, struct page *buffer_page,
+                       unsigned int *buf_size);
+       int (*write_page) (unsigned long index, struct page *buffer_page,
+                       unsigned int buf_size);
+       void (*read_header_init) (void);
+       int (*rw_header_chunk) (int rw, struct toi_module_ops *owner,
+                       char *buffer, int buffer_size);
+       int (*rw_header_chunk_noreadahead) (int rw,
+                       struct toi_module_ops *owner,
+                       char *buffer, int buffer_size);
+       int (*write_header_chunk_finish) (void);
+       int (*rw_init) (int rw, int stream_number);
+       int (*rw_cleanup) (int rw);
+       void (*io_flusher) (int rw);
+};
+
+extern struct toi_bio_ops toi_bio_ops;
+
+extern char *toi_writer_buffer;
+extern int toi_writer_buffer_posn;
+extern struct hibernate_extent_iterate_saved_state toi_writer_posn_save[4];
+extern struct hibernate_extent_iterate_state toi_writer_posn;
diff --git a/kernel/power/tuxonice_builtin.c b/kernel/power/tuxonice_builtin.c
new file mode 100644
index 0000000..e5525d2
--- /dev/null
+++ b/kernel/power/tuxonice_builtin.c
@@ -0,0 +1,400 @@
+/*
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ */
+#include <linux/module.h>
+#include <linux/resume-trace.h>
+#include <linux/kernel.h>
+#include <linux/swap.h>
+#include <linux/syscalls.h>
+#include <linux/bio.h>
+#include <linux/root_dev.h>
+#include <linux/freezer.h>
+#include <linux/reboot.h>
+#include <linux/writeback.h>
+#include <linux/tty.h>
+#include <linux/crypto.h>
+#include <linux/cpu.h>
+#include <linux/dyn_pageflags.h>
+#include <linux/ctype.h>
+#include "tuxonice_io.h"
+#include "tuxonice.h"
+#include "tuxonice_extent.h"
+#include "tuxonice_block_io.h"
+#include "tuxonice_netlink.h"
+#include "tuxonice_prepare_image.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_pagedir.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_builtin.h"
+#include "tuxonice_power_off.h"
+#include "power.h"
+
+/*
+ * Highmem related functions (x86 only).
+ */
+
+#ifdef CONFIG_HIGHMEM
+
+/**
+ * copyback_high: Restore highmem pages.
+ *
+ * Highmem data and pbe lists are/can be stored in highmem.
+ * The format is slightly different to the lowmem pbe lists
+ * used for the assembly code: the last pbe in each page is
+ * a struct page * instead of struct pbe *, pointing to the
+ * next page where pbes are stored (or NULL if happens to be
+ * the end of the list). Since we don't want to generate
+ * unnecessary deltas against swsusp code, we use a cast
+ * instead of a union.
+ **/
+
+static void copyback_high(void)
+{
+       struct page *pbe_page = (struct page *) restore_highmem_pblist;
+       struct pbe *this_pbe, *first_pbe;
+       unsigned long *origpage, *copypage;
+       int pbe_index = 1;
+
+       if (!pbe_page)
+               return;
+
+       this_pbe = (struct pbe *) kmap_atomic(pbe_page, KM_BOUNCE_READ);
+       first_pbe = this_pbe;
+
+       while (this_pbe) {
+               int loop = (PAGE_SIZE / sizeof(unsigned long)) - 1;
+
+               origpage = kmap_atomic((struct page *) this_pbe->orig_address,
+                       KM_BIO_DST_IRQ);
+               copypage = kmap_atomic((struct page *) this_pbe->address,
+                       KM_BIO_SRC_IRQ);
+
+               while (loop >= 0) {
+                       *(origpage + loop) = *(copypage + loop);
+                       loop--;
+               }
+
+               kunmap_atomic(origpage, KM_BIO_DST_IRQ);
+               kunmap_atomic(copypage, KM_BIO_SRC_IRQ);
+
+               if (!this_pbe->next)
+                       break;
+
+               if (pbe_index < PBES_PER_PAGE) {
+                       this_pbe++;
+                       pbe_index++;
+               } else {
+                       pbe_page = (struct page *) this_pbe->next;
+                       kunmap_atomic(first_pbe, KM_BOUNCE_READ);
+                       if (!pbe_page)
+                               return;
+                       this_pbe = (struct pbe *) kmap_atomic(pbe_page,
+                                       KM_BOUNCE_READ);
+                       first_pbe = this_pbe;
+                       pbe_index = 1;
+               }
+       }
+       kunmap_atomic(first_pbe, KM_BOUNCE_READ);
+}
+
+#else /* CONFIG_HIGHMEM */
+void copyback_high(void) { }
+#endif
+
+char toi_wait_for_keypress_dev_console(int timeout)
+{
+       int fd, this_timeout = 255;
+       char key = '\0';
+       struct termios t, t_backup;
+
+       /* We should be guaranteed /dev/console exists after populate_rootfs()
+        * in init/main.c.
+        */
+       fd = sys_open("/dev/console", O_RDONLY, 0);
+       if (fd < 0) {
+               printk(KERN_INFO "Couldn't open /dev/console.\n");
+               return key;
+       }
+
+       if (sys_ioctl(fd, TCGETS, (long)&t) < 0)
+               goto out_close;
+
+       memcpy(&t_backup, &t, sizeof(t));
+
+       t.c_lflag &= ~(ISIG|ICANON|ECHO);
+       t.c_cc[VMIN] = 0;
+
+new_timeout:
+       if (timeout > 0) {
+               this_timeout = timeout < 26 ? timeout : 25;
+               timeout -= this_timeout;
+               this_timeout *= 10;
+       }
+
+       t.c_cc[VTIME] = this_timeout;
+
+       if (sys_ioctl(fd, TCSETS, (long)&t) < 0)
+               goto out_restore;
+
+       while (1) {
+               if (sys_read(fd, &key, 1) <= 0) {
+                       if (timeout)
+                               goto new_timeout;
+                       key = '\0';
+                       break;
+               }
+               key = tolower(key);
+               if (test_toi_state(TOI_SANITY_CHECK_PROMPT)) {
+                       if (key == 'c') {
+                               set_toi_state(TOI_CONTINUE_REQ);
+                               break;
+                       } else if (key == ' ')
+                               break;
+               } else
+                       break;
+       }
+
+out_restore:
+       sys_ioctl(fd, TCSETS, (long)&t_backup);
+out_close:
+       sys_close(fd);
+
+       return key;
+}
+
+struct toi_boot_kernel_data toi_bkd __nosavedata
+               __attribute__((aligned(PAGE_SIZE))) = {
+       MY_BOOT_KERNEL_DATA_VERSION,
+       0,
+#ifdef CONFIG_TOI_REPLACE_SWSUSP
+       (1 << TOI_REPLACE_SWSUSP) |
+#endif
+       (1 << TOI_NO_FLUSHER_THREAD) |
+       (1 << TOI_PAGESET2_FULL) | (1 << TOI_LATE_CPU_HOTPLUG),
+};
+EXPORT_SYMBOL_GPL(toi_bkd);
+
+struct block_device *toi_open_by_devnum(dev_t dev, unsigned mode)
+{
+       struct block_device *bdev = bdget(dev);
+       int err = -ENOMEM;
+       int flags = mode & FMODE_WRITE ? O_RDWR : O_RDONLY;
+       flags |= O_NONBLOCK;
+       if (bdev)
+               err = blkdev_get(bdev, mode, flags);
+       return err ? ERR_PTR(err) : bdev;
+}
+EXPORT_SYMBOL_GPL(toi_open_by_devnum);
+
+EXPORT_SYMBOL_GPL(toi_wait_for_keypress_dev_console);
+EXPORT_SYMBOL_GPL(hibernation_platform_enter);
+EXPORT_SYMBOL_GPL(platform_begin);
+EXPORT_SYMBOL_GPL(platform_pre_snapshot);
+EXPORT_SYMBOL_GPL(platform_leave);
+EXPORT_SYMBOL_GPL(platform_end);
+EXPORT_SYMBOL_GPL(platform_finish);
+EXPORT_SYMBOL_GPL(platform_pre_restore);
+EXPORT_SYMBOL_GPL(platform_restore_cleanup);
+EXPORT_SYMBOL_GPL(power_kobj);
+EXPORT_SYMBOL_GPL(pm_notifier_call_chain);
+EXPORT_SYMBOL_GPL(init_swsusp_header);
+
+#ifdef CONFIG_ARCH_HIBERNATION_HEADER
+EXPORT_SYMBOL_GPL(arch_hibernation_header_save);
+EXPORT_SYMBOL_GPL(arch_hibernation_header_restore);
+#endif
+
+#ifdef CONFIG_TOI_CORE_EXPORTS
+#ifdef CONFIG_X86_64
+EXPORT_SYMBOL_GPL(restore_processor_state);
+EXPORT_SYMBOL_GPL(save_processor_state);
+#endif
+
+EXPORT_SYMBOL_GPL(drop_pagecache);
+EXPORT_SYMBOL_GPL(restore_pblist);
+EXPORT_SYMBOL_GPL(pm_mutex);
+EXPORT_SYMBOL_GPL(pm_restore_console);
+EXPORT_SYMBOL_GPL(super_blocks);
+EXPORT_SYMBOL_GPL(next_zone);
+
+EXPORT_SYMBOL_GPL(freeze_processes);
+EXPORT_SYMBOL_GPL(thaw_processes);
+EXPORT_SYMBOL_GPL(thaw_kernel_threads);
+EXPORT_SYMBOL_GPL(shrink_all_memory);
+EXPORT_SYMBOL_GPL(shrink_one_zone);
+EXPORT_SYMBOL_GPL(saveable_page);
+EXPORT_SYMBOL_GPL(swsusp_arch_suspend);
+EXPORT_SYMBOL_GPL(swsusp_arch_resume);
+EXPORT_SYMBOL_GPL(pm_prepare_console);
+EXPORT_SYMBOL_GPL(follow_page);
+EXPORT_SYMBOL_GPL(machine_halt);
+EXPORT_SYMBOL_GPL(block_dump);
+EXPORT_SYMBOL_GPL(unlink_lru_lists);
+EXPORT_SYMBOL_GPL(relink_lru_lists);
+EXPORT_SYMBOL_GPL(machine_power_off);
+EXPORT_SYMBOL_GPL(suspend_devices_and_enter);
+EXPORT_SYMBOL_GPL(first_online_pgdat);
+EXPORT_SYMBOL_GPL(next_online_pgdat);
+EXPORT_SYMBOL_GPL(machine_restart);
+EXPORT_SYMBOL_GPL(saved_command_line);
+EXPORT_SYMBOL_GPL(tasklist_lock);
+#ifdef CONFIG_PM_SLEEP_SMP
+EXPORT_SYMBOL_GPL(disable_nonboot_cpus);
+EXPORT_SYMBOL_GPL(enable_nonboot_cpus);
+#endif
+#endif
+
+int toi_wait = CONFIG_TOI_DEFAULT_WAIT;
+
+#ifdef CONFIG_TOI_USERUI_EXPORTS
+EXPORT_SYMBOL_GPL(kmsg_redirect);
+#endif
+EXPORT_SYMBOL_GPL(toi_wait);
+
+#if defined(CONFIG_TOI_USERUI_EXPORTS) || defined(CONFIG_TOI_CORE_EXPORTS)
+EXPORT_SYMBOL_GPL(console_printk);
+#endif
+#ifdef CONFIG_TOI_SWAP_EXPORTS /* TuxOnIce swap specific */
+EXPORT_SYMBOL_GPL(sys_swapon);
+EXPORT_SYMBOL_GPL(sys_swapoff);
+EXPORT_SYMBOL_GPL(si_swapinfo);
+EXPORT_SYMBOL_GPL(map_swap_page);
+EXPORT_SYMBOL_GPL(get_swap_page);
+EXPORT_SYMBOL_GPL(swap_free);
+EXPORT_SYMBOL_GPL(get_swap_info_struct);
+#endif
+
+#ifdef CONFIG_TOI_FILE_EXPORTS
+/* TuxOnice file allocator specific support */
+EXPORT_SYMBOL_GPL(sys_unlink);
+EXPORT_SYMBOL_GPL(sys_mknod);
+#endif
+
+/* Swap or file */
+#if defined(CONFIG_TOI_FILE_EXPORTS) || defined(CONFIG_TOI_SWAP_EXPORTS)
+EXPORT_SYMBOL_GPL(bio_set_pages_dirty);
+EXPORT_SYMBOL_GPL(name_to_dev_t);
+#endif
+
+#if defined(CONFIG_TOI_FILE_EXPORTS) || defined(CONFIG_TOI_SWAP_EXPORTS) || \
+       defined(CONFIG_TOI_CORE_EXPORTS)
+EXPORT_SYMBOL_GPL(resume_file);
+#endif
+struct toi_core_fns *toi_core_fns;
+EXPORT_SYMBOL_GPL(toi_core_fns);
+
+DECLARE_DYN_PAGEFLAGS(pageset1_map);
+DECLARE_DYN_PAGEFLAGS(pageset1_copy_map);
+EXPORT_SYMBOL_GPL(pageset1_map);
+EXPORT_SYMBOL_GPL(pageset1_copy_map);
+
+unsigned long toi_result;
+struct pagedir pagedir1 = {1};
+
+EXPORT_SYMBOL_GPL(toi_result);
+EXPORT_SYMBOL_GPL(pagedir1);
+
+unsigned long toi_get_nonconflicting_page(void)
+{
+       return toi_core_fns->get_nonconflicting_page();
+}
+
+int toi_post_context_save(void)
+{
+       return toi_core_fns->post_context_save();
+}
+
+int toi_try_hibernate(int have_pmsem)
+{
+       if (!toi_core_fns)
+               return -ENODEV;
+
+       return toi_core_fns->try_hibernate(have_pmsem);
+}
+
+void toi_try_resume(void)
+{
+       if (toi_core_fns)
+               toi_core_fns->try_resume();
+       else
+               printk(KERN_INFO "TuxOnIce core not loaded yet.\n");
+}
+
+int toi_lowlevel_builtin(void)
+{
+       int error = 0;
+
+       save_processor_state();
+       error = swsusp_arch_suspend();
+       if (error)
+               printk(KERN_ERR "Error %d hibernating\n", error);
+
+       /* Restore control flow appears here */
+       if (!toi_in_hibernate) {
+               copyback_high();
+               set_toi_state(TOI_NOW_RESUMING);
+       }
+
+       restore_processor_state();
+
+       return error;
+}
+
+EXPORT_SYMBOL_GPL(toi_lowlevel_builtin);
+
+unsigned long toi_compress_bytes_in, toi_compress_bytes_out;
+EXPORT_SYMBOL_GPL(toi_compress_bytes_in);
+EXPORT_SYMBOL_GPL(toi_compress_bytes_out);
+
+unsigned long toi_state = ((1 << TOI_BOOT_TIME) |
+               (1 << TOI_IGNORE_LOGLEVEL) |
+               (1 << TOI_IO_STOPPED));
+EXPORT_SYMBOL_GPL(toi_state);
+
+/* The number of hibernates we have started (some may have been cancelled) */
+unsigned int nr_hibernates;
+EXPORT_SYMBOL_GPL(nr_hibernates);
+
+int toi_running;
+EXPORT_SYMBOL_GPL(toi_running);
+
+int toi_in_hibernate __nosavedata;
+EXPORT_SYMBOL_GPL(toi_in_hibernate);
+
+__nosavedata struct pbe *restore_highmem_pblist;
+
+#ifdef CONFIG_TOI_CORE_EXPORTS
+#ifdef CONFIG_HIGHMEM
+EXPORT_SYMBOL_GPL(nr_free_highpages);
+EXPORT_SYMBOL_GPL(saveable_highmem_page);
+EXPORT_SYMBOL_GPL(restore_highmem_pblist);
+#endif
+#endif
+
+#if defined(CONFIG_TOI_CORE_EXPORTS) || defined(CONFIG_TOI_PAGEFLAGS_EXPORTS)
+EXPORT_SYMBOL_GPL(max_pfn);
+#endif
+
+#if defined(CONFIG_TOI_EXPORTS) || defined(CONFIG_TOI_CORE_EXPORTS)
+EXPORT_SYMBOL_GPL(snprintf_used);
+#endif
+
+static int __init toi_wait_setup(char *str)
+{
+       int value;
+
+       if (sscanf(str, "=%d", &value)) {
+               if (value < -1 || value > 255)
+                       printk(KERN_INFO "TuxOnIce_wait outside range -1 to "
+                                       "255.\n");
+               else
+                       toi_wait = value;
+       }
+
+       return 1;
+}
+
+__setup("toi_wait", toi_wait_setup);
diff --git a/kernel/power/tuxonice_builtin.h b/kernel/power/tuxonice_builtin.h
new file mode 100644
index 0000000..f4966c4
--- /dev/null
+++ b/kernel/power/tuxonice_builtin.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ */
+#include <linux/dyn_pageflags.h>
+#include <asm/setup.h>
+
+extern struct toi_core_fns *toi_core_fns;
+extern unsigned long toi_compress_bytes_in, toi_compress_bytes_out;
+extern unsigned int nr_hibernates;
+extern int toi_in_hibernate;
+
+extern __nosavedata struct pbe *restore_highmem_pblist;
+
+int toi_lowlevel_builtin(void);
+
+extern struct dyn_pageflags __nosavedata toi_nosave_origmap;
+extern struct dyn_pageflags __nosavedata toi_nosave_copymap;
+
+#ifdef CONFIG_HIGHMEM
+extern __nosavedata struct zone_data *toi_nosave_zone_list;
+extern __nosavedata unsigned long toi_nosave_max_pfn;
+#endif
+
+extern unsigned long toi_get_nonconflicting_page(void);
+extern int toi_post_context_save(void);
+extern int toi_try_hibernate(int have_pmsem);
+extern char toi_wait_for_keypress_dev_console(int timeout);
+extern struct block_device *toi_open_by_devnum(dev_t dev, unsigned mode);
+extern int toi_wait;
diff --git a/kernel/power/tuxonice_checksum.c b/kernel/power/tuxonice_checksum.c
new file mode 100644
index 0000000..6e26130
--- /dev/null
+++ b/kernel/power/tuxonice_checksum.c
@@ -0,0 +1,389 @@
+/*
+ * kernel/power/tuxonice_checksum.c
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at tuxonice net)
+ * Copyright (C) 2006 Red Hat, inc.
+ *
+ * This file is released under the GPLv2.
+ *
+ * This file contains data checksum routines for TuxOnIce,
+ * using cryptoapi. They are used to locate any modifications
+ * made to pageset 2 while we're saving it.
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <linux/vmalloc.h>
+#include <linux/crypto.h>
+#include <linux/scatterlist.h>
+
+#include "tuxonice.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_io.h"
+#include "tuxonice_pageflags.h"
+#include "tuxonice_checksum.h"
+#include "tuxonice_pagedir.h"
+#include "tuxonice_alloc.h"
+
+static struct toi_module_ops toi_checksum_ops;
+
+/* Constant at the mo, but I might allow tuning later */
+static char toi_checksum_name[32] = "md4";
+/* Bytes per checksum */
+#define CHECKSUM_SIZE (16)
+
+#define CHECKSUMS_PER_PAGE ((PAGE_SIZE - sizeof(void *)) / CHECKSUM_SIZE)
+
+struct cpu_context {
+       struct crypto_hash *transform;
+       struct hash_desc desc;
+       struct scatterlist sg[2];
+       char *buf;
+};
+
+static DEFINE_PER_CPU(struct cpu_context, contexts);
+static int pages_allocated;
+static unsigned long page_list;
+
+static int toi_num_resaved;
+
+static unsigned long this_checksum, next_page;
+static int checksum_index;
+
+static inline int checksum_pages_needed(void)
+{
+       return DIV_ROUND_UP(pagedir2.size, CHECKSUMS_PER_PAGE);
+}
+
+/* ---- Local buffer management ---- */
+
+/*
+ * toi_checksum_cleanup
+ *
+ * Frees memory allocated for our labours.
+ */
+static void toi_checksum_cleanup(int ending_cycle)
+{
+       int cpu;
+
+       if (ending_cycle) {
+               for_each_online_cpu(cpu) {
+                       struct cpu_context *this = &per_cpu(contexts, cpu);
+                       if (this->transform) {
+                               crypto_free_hash(this->transform);
+                               this->transform = NULL;
+                               this->desc.tfm = NULL;
+                       }
+
+                       if (this->buf) {
+                               toi_free_page(27, (unsigned long) this->buf);
+                               this->buf = NULL;
+                       }
+               }
+       }
+}
+
+/*
+ * toi_crypto_initialise
+ *
+ * Prepare to do some work by allocating buffers and transforms.
+ * Returns: Int: Zero. Even if we can't set up checksum, we still
+ * seek to hibernate.
+ */
+static int toi_checksum_initialise(int starting_cycle)
+{
+       int cpu;
+
+       if (!(starting_cycle & SYSFS_HIBERNATE) || !toi_checksum_ops.enabled)
+               return 0;
+
+       if (!*toi_checksum_name) {
+               printk(KERN_INFO "TuxOnIce: No checksum algorithm name set.\n");
+               return 1;
+       }
+
+       for_each_online_cpu(cpu) {
+               struct cpu_context *this = &per_cpu(contexts, cpu);
+               struct page *page;
+
+               this->transform = crypto_alloc_hash(toi_checksum_name, 0, 0);
+               if (IS_ERR(this->transform)) {
+                       printk(KERN_INFO "TuxOnIce: Failed to initialise the "
+                               "%s checksum algorithm: %ld.\n",
+                               toi_checksum_name, (long) this->transform);
+                       this->transform = NULL;
+                       return 1;
+               }
+
+               this->desc.tfm = this->transform;
+               this->desc.flags = 0;
+
+               page = toi_alloc_page(27, GFP_KERNEL);
+               if (!page)
+                       return 1;
+               this->buf = page_address(page);
+               sg_init_one(&this->sg[0], this->buf, PAGE_SIZE);
+       }
+       return 0;
+}
+
+/*
+ * toi_checksum_print_debug_stats
+ * @buffer: Pointer to a buffer into which the debug info will be printed.
+ * @size: Size of the buffer.
+ *
+ * Print information to be recorded for debugging purposes into a buffer.
+ * Returns: Number of characters written to the buffer.
+ */
+
+static int toi_checksum_print_debug_stats(char *buffer, int size)
+{
+       int len;
+
+       if (!toi_checksum_ops.enabled)
+               return snprintf_used(buffer, size,
+                       "- Checksumming disabled.\n");
+
+       len = snprintf_used(buffer, size, "- Checksum method is '%s'.\n",
+                       toi_checksum_name);
+       len += snprintf_used(buffer + len, size - len,
+               "  %d pages resaved in atomic copy.\n", toi_num_resaved);
+       return len;
+}
+
+static int toi_checksum_memory_needed(void)
+{
+       return toi_checksum_ops.enabled ?
+               checksum_pages_needed() << PAGE_SHIFT : 0;
+}
+
+static int toi_checksum_storage_needed(void)
+{
+       if (toi_checksum_ops.enabled)
+               return strlen(toi_checksum_name) + sizeof(int) + 1;
+       else
+               return 0;
+}
+
+/*
+ * toi_checksum_save_config_info
+ * @buffer: Pointer to a buffer of size PAGE_SIZE.
+ *
+ * Save informaton needed when reloading the image at resume time.
+ * Returns: Number of bytes used for saving our data.
+ */
+static int toi_checksum_save_config_info(char *buffer)
+{
+       int namelen = strlen(toi_checksum_name) + 1;
+       int total_len;
+
+       *((unsigned int *) buffer) = namelen;
+       strncpy(buffer + sizeof(unsigned int), toi_checksum_name, namelen);
+       total_len = sizeof(unsigned int) + namelen;
+       return total_len;
+}
+
+/* toi_checksum_load_config_info
+ * @buffer: Pointer to the start of the data.
+ * @size: Number of bytes that were saved.
+ *
+ * Description:        Reload information needed for dechecksuming the image at
+ * resume time.
+ */
+static void toi_checksum_load_config_info(char *buffer, int size)
+{
+       int namelen;
+
+       namelen = *((unsigned int *) (buffer));
+       strncpy(toi_checksum_name, buffer + sizeof(unsigned int),
+                       namelen);
+       return;
+}
+
+/*
+ * Free Checksum Memory
+ */
+
+void free_checksum_pages(void)
+{
+       while (pages_allocated) {
+               unsigned long next = *((unsigned long *) page_list);
+               ClearPageNosave(virt_to_page(page_list));
+               toi_free_page(15, (unsigned long) page_list);
+               page_list = next;
+               pages_allocated--;
+       }
+}
+
+/*
+ * Allocate Checksum Memory
+ */
+
+int allocate_checksum_pages(void)
+{
+       int pages_needed = checksum_pages_needed();
+
+       if (!toi_checksum_ops.enabled)
+               return 0;
+
+       while (pages_allocated < pages_needed) {
+               unsigned long *new_page =
+                 (unsigned long *) toi_get_zeroed_page(15, TOI_ATOMIC_GFP);
+               if (!new_page) {
+                       printk("Unable to allocate checksum pages.\n");
+                       return -ENOMEM;
+               }
+               SetPageNosave(virt_to_page(new_page));
+               (*new_page) = page_list;
+               page_list = (unsigned long) new_page;
+               pages_allocated++;
+       }
+
+       next_page = (unsigned long) page_list;
+       checksum_index = 0;
+
+       return 0;
+}
+
+#if 0
+static void print_checksum(char *buf, int size)
+{
+       int index;
+
+       for (index = 0; index < size; index++)
+               printk(KERN_INFO "%x ", buf[index]);
+
+       printk("\n");
+}
+#endif
+
+char *tuxonice_get_next_checksum(void)
+{
+       if (!toi_checksum_ops.enabled)
+               return NULL;
+
+       if (checksum_index % CHECKSUMS_PER_PAGE)
+               this_checksum += CHECKSUM_SIZE;
+       else {
+               this_checksum = next_page + sizeof(void *);
+               next_page = *((unsigned long *) next_page);
+       }
+
+       checksum_index++;
+       return (char *) this_checksum;
+}
+
+int tuxonice_calc_checksum(struct page *page, char *checksum_locn)
+{
+       char *pa;
+       int result, cpu = smp_processor_id();
+       struct cpu_context *ctx = &per_cpu(contexts, cpu);
+
+       if (!toi_checksum_ops.enabled)
+               return 0;
+
+       pa = kmap(page);
+       memcpy(ctx->buf, pa, PAGE_SIZE);
+       kunmap(page);
+       result = crypto_hash_digest(&ctx->desc, ctx->sg, PAGE_SIZE,
+                                               checksum_locn);
+       return result;
+}
+/*
+ * Calculate checksums
+ */
+
+void check_checksums(void)
+{
+       int pfn, index = 0, cpu = smp_processor_id();
+       unsigned long next_page, this_checksum = 0;
+       char current_checksum[CHECKSUM_SIZE];
+       struct cpu_context *ctx = &per_cpu(contexts, cpu);
+
+       if (!toi_checksum_ops.enabled)
+               return;
+
+       next_page = (unsigned long) page_list;
+
+       toi_num_resaved = 0;
+
+       BITMAP_FOR_EACH_SET(&pageset2_map, pfn) {
+               int ret;
+               char *pa;
+               struct page *page = pfn_to_page(pfn);
+
+               if (index % CHECKSUMS_PER_PAGE) {
+                       this_checksum += CHECKSUM_SIZE;
+               } else {
+                       this_checksum = next_page + sizeof(void *);
+                       next_page = *((unsigned long *) next_page);
+               }
+
+               /* Done when IRQs disabled so must be atomic */
+               pa = kmap_atomic(page, KM_USER1);
+               memcpy(ctx->buf, pa, PAGE_SIZE);
+               kunmap_atomic(pa, KM_USER1);
+               ret = crypto_hash_digest(&ctx->desc, ctx->sg, PAGE_SIZE,
+                                                       current_checksum);
+
+               if (ret) {
+                       printk(KERN_INFO "Digest failed. Returned %d.\n", ret);
+                       return;
+               }
+
+               if (memcmp(current_checksum, (char *) this_checksum,
+                                                       CHECKSUM_SIZE)) {
+                       SetPageResave(pfn_to_page(pfn));
+                       toi_num_resaved++;
+                       if (test_action_state(TOI_ABORT_ON_RESAVE_NEEDED))
+                               set_abort_result(TOI_RESAVE_NEEDED);
+               }
+
+               index++;
+       }
+}
+
+static struct toi_sysfs_data sysfs_params[] = {
+       { TOI_ATTR("enabled", SYSFS_RW),
+         SYSFS_INT(&toi_checksum_ops.enabled, 0, 1, 0)
+       },
+
+       { TOI_ATTR("abort_if_resave_needed", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_ABORT_ON_RESAVE_NEEDED, 0)
+       }
+};
+
+/*
+ * Ops structure.
+ */
+static struct toi_module_ops toi_checksum_ops = {
+       .type                   = MISC_MODULE,
+       .name                   = "checksumming",
+       .directory              = "checksum",
+       .module                 = THIS_MODULE,
+       .initialise             = toi_checksum_initialise,
+       .cleanup                = toi_checksum_cleanup,
+       .print_debug_info       = toi_checksum_print_debug_stats,
+       .save_config_info       = toi_checksum_save_config_info,
+       .load_config_info       = toi_checksum_load_config_info,
+       .memory_needed          = toi_checksum_memory_needed,
+       .storage_needed         = toi_checksum_storage_needed,
+
+       .sysfs_data             = sysfs_params,
+       .num_sysfs_entries      = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+/* ---- Registration ---- */
+int toi_checksum_init(void)
+{
+       int result = toi_register_module(&toi_checksum_ops);
+       return result;
+}
+
+void toi_checksum_exit(void)
+{
+       toi_unregister_module(&toi_checksum_ops);
+}
diff --git a/kernel/power/tuxonice_checksum.h b/kernel/power/tuxonice_checksum.h
new file mode 100644
index 0000000..81b928d
--- /dev/null
+++ b/kernel/power/tuxonice_checksum.h
@@ -0,0 +1,32 @@
+/*
+ * kernel/power/tuxonice_checksum.h
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at tuxonice net)
+ * Copyright (C) 2006 Red Hat, inc.
+ *
+ * This file is released under the GPLv2.
+ *
+ * This file contains data checksum routines for TuxOnIce,
+ * using cryptoapi. They are used to locate any modifications
+ * made to pageset 2 while we're saving it.
+ */
+
+#if defined(CONFIG_TOI_CHECKSUM)
+extern int toi_checksum_init(void);
+extern void toi_checksum_exit(void);
+void check_checksums(void);
+int allocate_checksum_pages(void);
+void free_checksum_pages(void);
+char *tuxonice_get_next_checksum(void);
+int tuxonice_calc_checksum(struct page *page, char *checksum_locn);
+#else
+static inline int toi_checksum_init(void) { return 0; }
+static inline void toi_checksum_exit(void) { }
+static inline void check_checksums(void) { };
+static inline int allocate_checksum_pages(void) { return 0; };
+static inline void free_checksum_pages(void) { };
+static inline char *tuxonice_get_next_checksum(void) { return NULL; };
+static inline int tuxonice_calc_checksum(struct page *page, char *checksum_locn)
+       { return 0; }
+#endif
+
diff --git a/kernel/power/tuxonice_cluster.c b/kernel/power/tuxonice_cluster.c
new file mode 100644
index 0000000..b5c9ea1
--- /dev/null
+++ b/kernel/power/tuxonice_cluster.c
@@ -0,0 +1,1088 @@
+/*
+ * kernel/power/tuxonice_cluster.c
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * This file contains routines for cluster hibernation support.
+ *
+ * Based on ip autoconfiguration code in net/ipv4/ipconfig.c.
+ *
+ * How does it work?
+ *
+ * There is no 'master' node that tells everyone else what to do. All nodes
+ * send messages to the broadcast address/port, maintain a list of peers
+ * and figure out when to progress to the next step in hibernating or resuming.
+ * This makes us more fault tolerant when it comes to nodes coming and going
+ * (which may be more of an issue if we're hibernating when power supplies
+ * are being unreliable).
+ *
+ * At boot time, we start a ktuxonice thread that handles communication with
+ * other nodes. This node maintains a state machine that controls our progress
+ * through hibernating and resuming, keeping us in step with other nodes. Nodes
+ * are identified by their hw address.
+ *
+ * On startup, the node sends CLUSTER_PING on the configured interface's
+ * broadcast address, port $toi_cluster_port (see below) and begins to listen
+ * for other broadcast messages. CLUSTER_PING messages are repeated at
+ * intervals of 5 minutes, with a random offset to spread traffic out.
+ *
+ * A hibernation cycle is initiated from any node via
+ *
+ * echo > /sys/power/tuxonice/do_hibernate
+ *
+ * and (possibily) the hibernate script. At each step of the process, the node
+ * completes its work, and waits for all other nodes to signal completion of
+ * their work (or timeout) before progressing to the next step.
+ *
+ * Request/state  Action before reply  Possible reply  Next state
+ * HIBERNATE     capable, pre-script   HIBERNATE|ACK   NODE_PREP
+ *                                     HIBERNATE|NACK  INIT_0
+ *
+ * PREP                  prepare_image         PREP|ACK        IMAGE_WRITE
+ *                                     PREP|NACK       INIT_0
+ *                                     ABORT           RUNNING
+ *
+ * IO            write image           IO|ACK          power off
+ *                                     ABORT           POST_RESUME
+ *
+ * (Boot time)   check for image       IMAGE|ACK       RESUME_PREP
+ *                                     (Note 1)
+ *                                     IMAGE|NACK      (Note 2)
+ *
+ * PREP                  prepare read image    PREP|ACK        IMAGE_READ
+ *                                     PREP|NACK       (As NACK_IMAGE)
+ *
+ * IO            read image            IO|ACK          POST_RESUME
+ *
+ * POST_RESUME   thaw, post-script                     RUNNING
+ *
+ * INIT_0        init 0
+ *
+ * Other messages:
+ *
+ * - PING: Request for all other live nodes to send a PONG. Used at startup to
+ *   announce presence, when a node is suspected dead and periodically, in case
+ *   segments of the network are [un]plugged.
+ *
+ * - PONG: Response to a PING.
+ *
+ * - ABORT: Request to cancel writing an image.
+ *
+ * - BYE: Notification that this node is shutting down.
+ *
+ * Note 1: Repeated at 3s intervals until we continue to boot/resume, so that
+ * nodes which are slower to start up can get state synchronised. If a node
+ * starting up sees other nodes sending RESUME_PREP or IMAGE_READ, it may send
+ * ACK_IMAGE and they will wait for it to catch up. If it sees ACK_READ, it
+ * must invalidate its image (if any) and boot normally.
+ *
+ * Note 2: May occur when one node lost power or powered off while others
+ * hibernated. This node waits for others to complete resuming (ACK_READ)
+ * before completing its boot, so that it appears as a fail node restarting.
+ *
+ * If any node has an image, then it also has a list of nodes that hibernated
+ * in synchronisation with it. The node will wait for other nodes to appear
+ * or timeout before beginning its restoration.
+ *
+ * If a node has no image, it needs to wait, in case other nodes which do have
+ * an image are going to resume, but are taking longer to announce their
+ * presence. For this reason, the user can specify a timeout value and a number
+ * of nodes detected before we just continue. (We might want to assume in a
+ * cluster of, say, 15 nodes, if 8 others have booted without finding an image,
+ * the remaining nodes will too. This might help in situations where some nodes
+ * are much slower to boot, or more subject to hardware failures or such like).
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/if.h>
+#include <linux/rtnetlink.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/if_arp.h>
+#include <linux/kthread.h>
+#include <linux/wait.h>
+#include <linux/netdevice.h>
+#include <net/ip.h>
+
+#include "tuxonice.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_alloc.h"
+#include "tuxonice_io.h"
+
+#if 1
+#define PRINTK(a, b...) do { printk(a, ##b); } while (0)
+#else
+#define PRINTK(a, b...) do { } while (0)
+#endif
+
+static int loopback_mode;
+static int num_local_nodes = 1;
+#define MAX_LOCAL_NODES 8
+#define SADDR (loopback_mode ? b->sid : h->saddr)
+
+#define MYNAME "TuxOnIce Clustering"
+
+enum cluster_message {
+       MSG_ACK = 1,
+       MSG_NACK = 2,
+       MSG_PING = 4,
+       MSG_ABORT = 8,
+       MSG_BYE = 16,
+       MSG_HIBERNATE = 32,
+       MSG_IMAGE = 64,
+       MSG_IO = 128,
+       MSG_RUNNING = 256
+};
+
+static char *str_message(int message)
+{
+       switch (message) {
+       case 4:
+               return "Ping";
+       case 8:
+               return "Abort";
+       case 9:
+               return "Abort acked";
+       case 10:
+               return "Abort nacked";
+       case 16:
+               return "Bye";
+       case 17:
+               return "Bye acked";
+       case 18:
+               return "Bye nacked";
+       case 32:
+               return "Hibernate request";
+       case 33:
+               return "Hibernate ack";
+       case 34:
+               return "Hibernate nack";
+       case 64:
+               return "Image exists?";
+       case 65:
+               return "Image does exist";
+       case 66:
+               return "No image here";
+       case 128:
+               return "I/O";
+       case 129:
+               return "I/O okay";
+       case 130:
+               return "I/O failed";
+       case 256:
+               return "Running";
+       default:
+               printk("Unrecognised message %d.\n", message);
+               return "Unrecognised message (see dmesg)";
+       }
+}
+
+#define MSG_ACK_MASK (MSG_ACK | MSG_NACK)
+#define MSG_STATE_MASK (~MSG_ACK_MASK)
+
+struct node_info {
+       struct list_head member_list;
+       wait_queue_head_t member_events;
+       spinlock_t member_list_lock;
+       spinlock_t receive_lock;
+       int peer_count, ignored_peer_count;
+       struct toi_sysfs_data sysfs_data;
+       enum cluster_message current_message;
+};
+
+struct node_info node_array[MAX_LOCAL_NODES];
+
+struct cluster_member {
+       __be32 addr;
+       enum cluster_message message;
+       struct list_head list;
+       int ignore;
+};
+
+#define toi_cluster_port_send 3501
+#define toi_cluster_port_recv 3502
+
+static struct net_device *net_dev;
+static struct toi_module_ops toi_cluster_ops;
+
+static int toi_recv(struct sk_buff *skb, struct net_device *dev,
+               struct packet_type *pt, struct net_device *orig_dev);
+
+static struct packet_type toi_cluster_packet_type = {
+       .type = __constant_htons(ETH_P_IP),
+       .func = toi_recv,
+};
+
+struct toi_pkt {               /* BOOTP packet format */
+       struct iphdr iph;       /* IP header */
+       struct udphdr udph;     /* UDP header */
+       u8 htype;               /* HW address type */
+       u8 hlen;                /* HW address length */
+       __be32 xid;             /* Transaction ID */
+       __be16 secs;            /* Seconds since we started */
+       __be16 flags;           /* Just what it says */
+       u8 hw_addr[16];         /* Sender's HW address */
+       u16 message;            /* Message */
+       unsigned long sid;      /* Source ID for loopback testing */
+};
+
+static char toi_cluster_iface[IFNAMSIZ] = CONFIG_TOI_DEFAULT_CLUSTER_INTERFACE;
+
+static int added_pack;
+
+static int others_have_image;
+
+/* Key used to allow multiple clusters on the same lan */
+static char toi_cluster_key[32] = CONFIG_TOI_DEFAULT_CLUSTER_KEY;
+static char pre_hibernate_script[255] =
+       CONFIG_TOI_DEFAULT_CLUSTER_PRE_HIBERNATE;
+static char post_hibernate_script[255] =
+       CONFIG_TOI_DEFAULT_CLUSTER_POST_HIBERNATE;
+
+/*                     List of cluster members                 */
+static unsigned long continue_delay = 5 * HZ;
+static unsigned long cluster_message_timeout = 3 * HZ;
+
+/*             === Membership list ===         */
+
+static void print_member_info(int index)
+{
+       struct cluster_member *this;
+
+       printk(KERN_INFO "==> Dumping node %d.\n", index);
+
+       list_for_each_entry(this, &node_array[index].member_list, list)
+               printk(KERN_INFO "%d.%d.%d.%d last message %s. %s\n",
+                               NIPQUAD(this->addr),
+                               str_message(this->message),
+                               this->ignore ? "(Ignored)" : "");
+       printk(KERN_INFO "== Done ==\n");
+}
+
+static struct cluster_member *__find_member(int index, __be32 addr)
+{
+       struct cluster_member *this;
+
+       list_for_each_entry(this, &node_array[index].member_list, list) {
+               if (this->addr != addr)
+                       continue;
+
+               return this;
+       }
+
+       return NULL;
+}
+
+static void set_ignore(int index, __be32 addr, struct cluster_member *this)
+{
+       if (this->ignore) {
+               PRINTK("Node %d already ignoring %d.%d.%d.%d.\n",
+                               index, NIPQUAD(addr));
+               return;
+       }
+
+       PRINTK("Node %d sees node %d.%d.%d.%d now being ignored.\n",
+                               index, NIPQUAD(addr));
+       this->ignore = 1;
+       node_array[index].ignored_peer_count++;
+}
+
+static int __add_update_member(int index, __be32 addr, int message)
+{
+       struct cluster_member *this;
+
+       this = __find_member(index, addr);
+       if (this) {
+               if (this->message != message) {
+                       this->message = message;
+                       if ((message & MSG_NACK) &&
+                           (message & (MSG_HIBERNATE | MSG_IMAGE | MSG_IO)))
+                               set_ignore(index, addr, this);
+                       PRINTK("Node %d sees node %d.%d.%d.%d now sending "
+                                       "%s.\n", index, NIPQUAD(addr),
+                                       str_message(message));
+                       wake_up(&node_array[index].member_events);
+               }
+               return 0;
+       }
+
+       this = (struct cluster_member *) toi_kzalloc(36,
+                       sizeof(struct cluster_member), GFP_KERNEL);
+
+       if (!this)
+               return -1;
+
+       this->addr = addr;
+       this->message = message;
+       this->ignore = 0;
+       INIT_LIST_HEAD(&this->list);
+
+       node_array[index].peer_count++;
+
+       PRINTK("Node %d sees node %d.%d.%d.%d sending %s.\n", index,
+                       NIPQUAD(addr), str_message(message));
+
+       if ((message & MSG_NACK) &&
+           (message & (MSG_HIBERNATE | MSG_IMAGE | MSG_IO)))
+               set_ignore(index, addr, this);
+       list_add_tail(&this->list, &node_array[index].member_list);
+       return 1;
+}
+
+static int add_update_member(int index, __be32 addr, int message)
+{
+       int result;
+       unsigned long flags;
+       spin_lock_irqsave(&node_array[index].member_list_lock, flags);
+       result = __add_update_member(index, addr, message);
+       spin_unlock_irqrestore(&node_array[index].member_list_lock, flags);
+
+       print_member_info(index);
+
+       wake_up(&node_array[index].member_events);
+
+       return result;
+}
+
+static void del_member(int index, __be32 addr)
+{
+       struct cluster_member *this;
+       unsigned long flags;
+
+       spin_lock_irqsave(&node_array[index].member_list_lock, flags);
+       this = __find_member(index, addr);
+
+       if (this) {
+               list_del_init(&this->list);
+               toi_kfree(36, this);
+               node_array[index].peer_count--;
+       }
+
+       spin_unlock_irqrestore(&node_array[index].member_list_lock, flags);
+}
+
+/*             === Message transmission ===    */
+
+static void toi_send_if(int message, unsigned long my_id);
+
+/*
+ *  Process received TOI packet.
+ */
+static int toi_recv(struct sk_buff *skb, struct net_device *dev,
+               struct packet_type *pt, struct net_device *orig_dev)
+{
+       struct toi_pkt *b;
+       struct iphdr *h;
+       int len, result, index;
+       unsigned long addr, message, ack;
+
+       /* Perform verifications before taking the lock.  */
+       if (skb->pkt_type == PACKET_OTHERHOST)
+               goto drop;
+
+       if (dev != net_dev)
+               goto drop;
+
+       skb = skb_share_check(skb, GFP_ATOMIC);
+       if (!skb)
+               return NET_RX_DROP;
+
+       if (!pskb_may_pull(skb,
+                          sizeof(struct iphdr) +
+                          sizeof(struct udphdr)))
+               goto drop;
+
+       b = (struct toi_pkt *)skb_network_header(skb);
+       h = &b->iph;
+
+       if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
+               goto drop;
+
+       /* Fragments are not supported */
+       if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
+               if (net_ratelimit())
+                       printk(KERN_ERR "TuxOnIce: Ignoring fragmented "
+                              "cluster message.\n");
+               goto drop;
+       }
+
+       if (skb->len < ntohs(h->tot_len))
+               goto drop;
+
+       if (ip_fast_csum((char *) h, h->ihl))
+               goto drop;
+
+       if (b->udph.source != htons(toi_cluster_port_send) ||
+           b->udph.dest != htons(toi_cluster_port_recv))
+               goto drop;
+
+       if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
+               goto drop;
+
+       len = ntohs(b->udph.len) - sizeof(struct udphdr);
+
+       /* Ok the front looks good, make sure we can get at the rest.  */
+       if (!pskb_may_pull(skb, skb->len))
+               goto drop;
+
+       b = (struct toi_pkt *)skb_network_header(skb);
+       h = &b->iph;
+
+       addr = SADDR;
+       PRINTK(">>> Message %s received from " NIPQUAD_FMT ".\n",
+                       str_message(b->message), NIPQUAD(addr));
+
+       message = b->message & MSG_STATE_MASK;
+       ack = b->message & MSG_ACK_MASK;
+
+       for (index = 0; index < num_local_nodes; index++) {
+               int new_message = node_array[index].current_message,
+                   old_message = new_message;
+
+               if (index == SADDR || !old_message) {
+                       PRINTK("Ignoring node %d (offline or self).\n", index);
+                       continue;
+               }
+
+               /* One message at a time, please. */
+               spin_lock(&node_array[index].receive_lock);
+
+               result = add_update_member(index, SADDR, b->message);
+               if (result == -1) {
+                       printk(KERN_INFO "Failed to add new cluster member "
+                                       NIPQUAD_FMT ".\n",
+                                       NIPQUAD(addr));
+                       goto drop_unlock;
+               }
+
+               switch (b->message & MSG_STATE_MASK) {
+               case MSG_PING:
+                       break;
+               case MSG_ABORT:
+                       break;
+               case MSG_BYE:
+                       break;
+               case MSG_HIBERNATE:
+                       /* Can I hibernate? */
+                       new_message = MSG_HIBERNATE |
+                               ((index & 1) ? MSG_NACK : MSG_ACK);
+                       break;
+               case MSG_IMAGE:
+                       /* Can I resume? */
+                       new_message = MSG_IMAGE |
+                               ((index & 1) ? MSG_NACK : MSG_ACK);
+                       if (new_message != old_message)
+                               printk("Setting whether I can resume to %d.\n",
+                                               new_message);
+                       break;
+               case MSG_IO:
+                       new_message = MSG_IO | MSG_ACK;
+                       break;
+               case MSG_RUNNING:
+                       break;
+               default:
+                       if (net_ratelimit())
+                               printk(KERN_ERR "Unrecognised TuxOnIce cluster"
+                                       " message %d from " NIPQUAD_FMT ".\n",
+                                       b->message, NIPQUAD(addr));
+               };
+
+               if (old_message != new_message) {
+                       node_array[index].current_message = new_message;
+                       printk(KERN_INFO ">>> Sending new message for node "
+                                       "%d.\n", index);
+                       toi_send_if(new_message, index);
+               } else if (!ack) {
+                       printk(KERN_INFO ">>> Resending message for node %d.\n",
+                                       index);
+                       toi_send_if(new_message, index);
+               }
+drop_unlock:
+               spin_unlock(&node_array[index].receive_lock);
+       };
+
+drop:
+       /* Throw the packet out. */
+       kfree_skb(skb);
+
+       return 0;
+}
+
+/*
+ *  Send cluster message to single interface.
+ */
+static void toi_send_if(int message, unsigned long my_id)
+{
+       struct sk_buff *skb;
+       struct toi_pkt *b;
+       int hh_len = LL_RESERVED_SPACE(net_dev);
+       struct iphdr *h;
+
+       /* Allocate packet */
+       skb = alloc_skb(sizeof(struct toi_pkt) + hh_len + 15, GFP_KERNEL);
+       if (!skb)
+               return;
+       skb_reserve(skb, hh_len);
+       b = (struct toi_pkt *) skb_put(skb, sizeof(struct toi_pkt));
+       memset(b, 0, sizeof(struct toi_pkt));
+
+       /* Construct IP header */
+       skb_reset_network_header(skb);
+       h = ip_hdr(skb);
+       h->version = 4;
+       h->ihl = 5;
+       h->tot_len = htons(sizeof(struct toi_pkt));
+       h->frag_off = htons(IP_DF);
+       h->ttl = 64;
+       h->protocol = IPPROTO_UDP;
+       h->daddr = htonl(INADDR_BROADCAST);
+       h->check = ip_fast_csum((unsigned char *) h, h->ihl);
+
+       /* Construct UDP header */
+       b->udph.source = htons(toi_cluster_port_send);
+       b->udph.dest = htons(toi_cluster_port_recv);
+       b->udph.len = htons(sizeof(struct toi_pkt) - sizeof(struct iphdr));
+       /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
+
+       /* Construct message */
+       b->message = message;
+       b->sid = my_id;
+       b->htype = net_dev->type; /* can cause undefined behavior */
+       b->hlen = net_dev->addr_len;
+       memcpy(b->hw_addr, net_dev->dev_addr, net_dev->addr_len);
+       b->secs = htons(3); /* 3 seconds */
+
+       /* Chain packet down the line... */
+       skb->dev = net_dev;
+       skb->protocol = htons(ETH_P_IP);
+       if ((dev_hard_header(skb, net_dev, ntohs(skb->protocol),
+                    net_dev->broadcast, net_dev->dev_addr, skb->len) < 0) ||
+                       dev_queue_xmit(skb) < 0)
+               printk(KERN_INFO "E");
+}
+
+/*     =========================================               */
+
+/*                     kTOICluster                     */
+
+static atomic_t num_cluster_threads;
+static DECLARE_WAIT_QUEUE_HEAD(clusterd_events);
+
+static int kTOICluster(void *data)
+{
+       unsigned long my_id;
+
+       my_id = atomic_add_return(1, &num_cluster_threads) - 1;
+       node_array[my_id].current_message = (unsigned long) data;
+
+       PRINTK("kTOICluster daemon %lu starting.\n", my_id);
+
+       current->flags |= PF_NOFREEZE;
+
+       while (node_array[my_id].current_message) {
+               toi_send_if(node_array[my_id].current_message, my_id);
+               sleep_on_timeout(&clusterd_events,
+                               cluster_message_timeout);
+               PRINTK("Link state %lu is %d.\n", my_id,
+                               node_array[my_id].current_message);
+       }
+
+       toi_send_if(MSG_BYE, my_id);
+       atomic_dec(&num_cluster_threads);
+       wake_up(&clusterd_events);
+
+       PRINTK("kTOICluster daemon %lu exiting.\n", my_id);
+       __set_current_state(TASK_RUNNING);
+       return 0;
+}
+
+static void kill_clusterd(void)
+{
+       int i;
+
+       for (i = 0; i < num_local_nodes; i++) {
+               if (node_array[i].current_message) {
+                       PRINTK("Seeking to kill clusterd %d.\n", i);
+                       node_array[i].current_message = 0;
+               }
+       }
+       wait_event(clusterd_events,
+                       !atomic_read(&num_cluster_threads));
+       PRINTK("All cluster daemons have exited.\n");
+}
+
+static int peers_not_in_message(int index, int message, int precise)
+{
+       struct cluster_member *this;
+       unsigned long flags;
+       int result = 0;
+
+       spin_lock_irqsave(&node_array[index].member_list_lock, flags);
+       list_for_each_entry(this, &node_array[index].member_list, list) {
+               if (this->ignore)
+                       continue;
+
+               PRINTK("Peer %d.%d.%d.%d sending %s. "
+                       "Seeking %s.\n",
+                       NIPQUAD(this->addr),
+                       str_message(this->message), str_message(message));
+               if ((precise ? this->message :
+                                       this->message & MSG_STATE_MASK) !=
+                                       message)
+                       result++;
+       }
+       spin_unlock_irqrestore(&node_array[index].member_list_lock, flags);
+       PRINTK("%d peers in sought message.\n", result);
+       return result;
+}
+
+static void reset_ignored(int index)
+{
+       struct cluster_member *this;
+       unsigned long flags;
+
+       spin_lock_irqsave(&node_array[index].member_list_lock, flags);
+       list_for_each_entry(this, &node_array[index].member_list, list)
+               this->ignore = 0;
+       node_array[index].ignored_peer_count = 0;
+       spin_unlock_irqrestore(&node_array[index].member_list_lock, flags);
+}
+
+static int peers_in_message(int index, int message, int precise)
+{
+       return node_array[index].peer_count -
+               node_array[index].ignored_peer_count -
+               peers_not_in_message(index, message, precise);
+}
+
+static int time_to_continue(int index, unsigned long start, int message)
+{
+       int first = peers_not_in_message(index, message, 0);
+       int second = peers_in_message(index, message, 1);
+
+       PRINTK("First part returns %d, second returns %d.\n", first, second);
+
+       if (!first && !second) {
+               PRINTK("All peers answered message %d.\n",
+                       message);
+               return 1;
+       }
+
+       if (time_after(jiffies, start + continue_delay)) {
+               PRINTK("Timeout reached.\n");
+               return 1;
+       }
+
+       PRINTK("Not time to continue yet (%lu < %lu).\n", jiffies,
+                       start + continue_delay);
+       return 0;
+}
+
+void toi_initiate_cluster_hibernate(void)
+{
+       int result;
+       unsigned long start;
+
+       result = do_toi_step(STEP_HIBERNATE_PREPARE_IMAGE);
+       if (result)
+               return;
+
+       toi_send_if(MSG_HIBERNATE, 0);
+
+       start = jiffies;
+       wait_event(node_array[0].member_events,
+                       time_to_continue(0, start, MSG_HIBERNATE));
+
+       if (test_action_state(TOI_FREEZER_TEST)) {
+               toi_send_if(MSG_ABORT, 0);
+
+               start = jiffies;
+               wait_event(node_array[0].member_events,
+                       time_to_continue(0, start, MSG_RUNNING));
+
+               do_toi_step(STEP_QUIET_CLEANUP);
+               return;
+       }
+
+       toi_send_if(MSG_IO, 0);
+
+       result = do_toi_step(STEP_HIBERNATE_SAVE_IMAGE);
+       if (result)
+               return;
+
+       /* This code runs at resume time too! */
+       if (toi_in_hibernate)
+               result = do_toi_step(STEP_HIBERNATE_POWERDOWN);
+}
+EXPORT_SYMBOL_GPL(toi_initiate_cluster_hibernate);
+
+/* toi_cluster_print_debug_stats
+ *
+ * Description:        Print information to be recorded for debugging purposes into a
+ *             buffer.
+ * Arguments:  buffer: Pointer to a buffer into which the debug info will be
+ *                     printed.
+ *             size:   Size of the buffer.
+ * Returns:    Number of characters written to the buffer.
+ */
+static int toi_cluster_print_debug_stats(char *buffer, int size)
+{
+       int len;
+
+       if (strlen(toi_cluster_iface))
+               len = snprintf_used(buffer, size,
+                               "- Cluster interface is '%s'.\n",
+                               toi_cluster_iface);
+       else
+               len = snprintf_used(buffer, size,
+                               "- Cluster support is disabled.\n");
+       return len;
+}
+
+/* cluster_memory_needed
+ *
+ * Description:        Tell the caller how much memory we need to operate during
+ *             hibernate/resume.
+ * Returns:    Unsigned long. Maximum number of bytes of memory required for
+ *             operation.
+ */
+static int toi_cluster_memory_needed(void)
+{
+       return 0;
+}
+
+static int toi_cluster_storage_needed(void)
+{
+       return 1 + strlen(toi_cluster_iface);
+}
+
+/* toi_cluster_save_config_info
+ *
+ * Description:        Save informaton needed when reloading the image at resume time.
+ * Arguments:  Buffer:         Pointer to a buffer of size PAGE_SIZE.
+ * Returns:    Number of bytes used for saving our data.
+ */
+static int toi_cluster_save_config_info(char *buffer)
+{
+       strcpy(buffer, toi_cluster_iface);
+       return strlen(toi_cluster_iface + 1);
+}
+
+/* toi_cluster_load_config_info
+ *
+ * Description:        Reload information needed for declustering the image at
+ *             resume time.
+ * Arguments:  Buffer:         Pointer to the start of the data.
+ *             Size:           Number of bytes that were saved.
+ */
+static void toi_cluster_load_config_info(char *buffer, int size)
+{
+       strncpy(toi_cluster_iface, buffer, size);
+       return;
+}
+
+static void cluster_startup(void)
+{
+       int have_image = do_check_can_resume(), i;
+       unsigned long start = jiffies, initial_message;
+       struct task_struct *p;
+
+       initial_message = MSG_IMAGE;
+
+       have_image = 1;
+
+       for (i = 0; i < num_local_nodes; i++) {
+               PRINTK("Starting ktoiclusterd %d.\n", i);
+               p = kthread_create(kTOICluster, (void *) initial_message,
+                               "ktoiclusterd/%d", i);
+               if (IS_ERR(p)) {
+                       printk("Failed to start ktoiclusterd.\n");
+                       return;
+               }
+
+               wake_up_process(p);
+       }
+
+       /* Wait for delay or someone else sending first message */
+       wait_event(node_array[0].member_events, time_to_continue(0, start,
+                               MSG_IMAGE));
+
+       others_have_image = peers_in_message(0, MSG_IMAGE | MSG_ACK, 1);
+
+       printk(KERN_INFO "Continuing. I %shave an image. Peers with image:"
+               " %d.\n", have_image ? "" : "don't ", others_have_image);
+
+       if (have_image) {
+               int result;
+
+               /* Start to resume */
+               printk(KERN_INFO "  === Starting to resume ===  \n");
+               node_array[0].current_message = MSG_IO;
+               toi_send_if(MSG_IO, 0);
+
+               /* result = do_toi_step(STEP_RESUME_LOAD_PS1); */
+               result = 0;
+
+               if (!result) {
+                       /*
+                        * Atomic restore - we'll come back in the hibernation
+                        * path.
+                        */
+
+                       /* result = do_toi_step(STEP_RESUME_DO_RESTORE); */
+                       result = 0;
+
+                       /* do_toi_step(STEP_QUIET_CLEANUP); */
+               }
+
+               node_array[0].current_message |= MSG_NACK;
+
+               /* For debugging - disable for real life? */
+               wait_event(node_array[0].member_events,
+                               time_to_continue(0, start, MSG_IO));
+       }
+
+       if (others_have_image) {
+               /* Wait for them to resume */
+               printk(KERN_INFO "Waiting for other nodes to resume.\n");
+               start = jiffies;
+               wait_event(node_array[0].member_events,
+                               time_to_continue(0, start, MSG_RUNNING));
+               if (peers_not_in_message(0, MSG_RUNNING, 0))
+                       printk(KERN_INFO "Timed out while waiting for other "
+                                       "nodes to resume.\n");
+       }
+
+       /* Find out whether an image exists here. Send ACK_IMAGE or NACK_IMAGE
+        * as appropriate.
+        *
+        * If we don't have an image:
+        * - Wait until someone else says they have one, or conditions are met
+        *   for continuing to boot (n machines or t seconds).
+        * - If anyone has an image, wait for them to resume before continuing
+        *   to boot.
+        *
+        * If we have an image:
+        * - Wait until conditions are met before continuing to resume (n
+        *   machines or t seconds). Send RESUME_PREP and freeze processes.
+        *   NACK_PREP if freezing fails (shouldn't) and follow logic for
+        *   us having no image above. On success, wait for [N]ACK_PREP from
+        *   other machines. Read image (including atomic restore) until done.
+        *   Wait for ACK_READ from others (should never fail). Thaw processes
+        *   and do post-resume. (The section after the atomic restore is done
+        *   via the code for hibernating).
+        */
+
+       node_array[0].current_message = MSG_RUNNING;
+}
+
+/* toi_cluster_open_iface
+ *
+ * Description:        Prepare to use an interface.
+ */
+
+static int toi_cluster_open_iface(void)
+{
+       struct net_device *dev;
+
+       rtnl_lock();
+
+       for_each_netdev(&init_net, dev) {
+               if (/* dev == &init_net.loopback_dev || */
+                   strcmp(dev->name, toi_cluster_iface))
+                       continue;
+
+               net_dev = dev;
+               break;
+       }
+
+       rtnl_unlock();
+
+       if (!net_dev) {
+               printk(KERN_ERR MYNAME ": Device %s not found.\n",
+                               toi_cluster_iface);
+               return -ENODEV;
+       }
+
+       dev_add_pack(&toi_cluster_packet_type);
+       added_pack = 1;
+
+       loopback_mode = (net_dev == init_net.loopback_dev);
+       num_local_nodes = loopback_mode ? 8 : 1;
+
+       PRINTK("Loopback mode is %s. Number of local nodes is %d.\n",
+                       loopback_mode ? "on" : "off", num_local_nodes);
+
+       cluster_startup();
+       return 0;
+}
+
+/* toi_cluster_close_iface
+ *
+ * Description: Stop using an interface.
+ */
+
+static int toi_cluster_close_iface(void)
+{
+       kill_clusterd();
+       if (added_pack) {
+               dev_remove_pack(&toi_cluster_packet_type);
+               added_pack = 0;
+       }
+       return 0;
+}
+
+static void write_side_effect(void)
+{
+       if (toi_cluster_ops.enabled) {
+               toi_cluster_open_iface();
+               set_toi_state(TOI_CLUSTER_MODE);
+       } else {
+               toi_cluster_close_iface();
+               clear_toi_state(TOI_CLUSTER_MODE);
+       }
+}
+
+static void node_write_side_effect(void)
+{
+}
+
+/*
+ * data for our sysfs entries.
+ */
+static struct toi_sysfs_data sysfs_params[] = {
+       {
+               TOI_ATTR("interface", SYSFS_RW),
+               SYSFS_STRING(toi_cluster_iface, IFNAMSIZ, 0)
+       },
+
+       {
+               TOI_ATTR("enabled", SYSFS_RW),
+               SYSFS_INT(&toi_cluster_ops.enabled, 0, 1, 0),
+               .write_side_effect = write_side_effect,
+       },
+
+       {
+               TOI_ATTR("cluster_name", SYSFS_RW),
+               SYSFS_STRING(toi_cluster_key, 32, 0)
+       },
+
+       {
+               TOI_ATTR("pre-hibernate-script", SYSFS_RW),
+               SYSFS_STRING(pre_hibernate_script, 256, 0)
+       },
+
+       {
+               TOI_ATTR("post-hibernate-script", SYSFS_RW),
+               SYSFS_STRING(post_hibernate_script, 256, 0)
+       },
+
+       {
+               TOI_ATTR("continue_delay", SYSFS_RW),
+               SYSFS_UL(&continue_delay, HZ / 2, 60 * HZ, 0)
+       }
+};
+
+/*
+ * Ops structure.
+ */
+
+static struct toi_module_ops toi_cluster_ops = {
+       .type                   = FILTER_MODULE,
+       .name                   = "Cluster",
+       .directory              = "cluster",
+       .module                 = THIS_MODULE,
+       .memory_needed          = toi_cluster_memory_needed,
+       .print_debug_info       = toi_cluster_print_debug_stats,
+       .save_config_info       = toi_cluster_save_config_info,
+       .load_config_info       = toi_cluster_load_config_info,
+       .storage_needed         = toi_cluster_storage_needed,
+
+       .sysfs_data             = sysfs_params,
+       .num_sysfs_entries      = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+/* ---- Registration ---- */
+
+#ifdef MODULE
+#define INIT static __init
+#define EXIT static __exit
+#else
+#define INIT
+#define EXIT
+#endif
+
+INIT int toi_cluster_init(void)
+{
+       int temp = toi_register_module(&toi_cluster_ops), i;
+       struct kobject *kobj = toi_cluster_ops.dir_kobj;
+
+       for (i = 0; i < MAX_LOCAL_NODES; i++) {
+               node_array[i].current_message = 0;
+               INIT_LIST_HEAD(&node_array[i].member_list);
+               init_waitqueue_head(&node_array[i].member_events);
+               spin_lock_init(&node_array[i].member_list_lock);
+               spin_lock_init(&node_array[i].receive_lock);
+
+               /* Set up sysfs entry */
+               node_array[i].sysfs_data.attr.name = toi_kzalloc(8,
+                               sizeof(node_array[i].sysfs_data.attr.name),
+                               GFP_KERNEL);
+               sprintf((char *) node_array[i].sysfs_data.attr.name, "node_%d",
+                               i);
+               node_array[i].sysfs_data.attr.mode = SYSFS_RW;
+               node_array[i].sysfs_data.type = TOI_SYSFS_DATA_INTEGER;
+               node_array[i].sysfs_data.flags = 0;
+               node_array[i].sysfs_data.data.integer.variable =
+                       (int *) &node_array[i].current_message;
+               node_array[i].sysfs_data.data.integer.minimum = 0;
+               node_array[i].sysfs_data.data.integer.maximum = INT_MAX;
+               node_array[i].sysfs_data.write_side_effect =
+                       node_write_side_effect;
+               toi_register_sysfs_file(kobj, &node_array[i].sysfs_data);
+       }
+
+       toi_cluster_ops.enabled = (strlen(toi_cluster_iface) > 0);
+
+       if (toi_cluster_ops.enabled)
+               toi_cluster_open_iface();
+
+       return temp;
+}
+
+EXIT void toi_cluster_exit(void)
+{
+       int i;
+       toi_cluster_close_iface();
+
+       for (i = 0; i < MAX_LOCAL_NODES; i++)
+               toi_unregister_sysfs_file(toi_cluster_ops.dir_kobj,
+                               &node_array[i].sysfs_data);
+       toi_unregister_module(&toi_cluster_ops);
+}
+
+static int __init toi_cluster_iface_setup(char *iface)
+{
+       toi_cluster_ops.enabled = (*iface &&
+                       strcmp(iface, "off"));
+
+       if (toi_cluster_ops.enabled)
+               strncpy(toi_cluster_iface, iface, strlen(iface));
+}
+
+__setup("toi_cluster=", toi_cluster_iface_setup);
+
+#ifdef MODULE
+MODULE_LICENSE("GPL");
+module_init(toi_cluster_init);
+module_exit(toi_cluster_exit);
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("Cluster Support for TuxOnIce");
+#endif
diff --git a/kernel/power/tuxonice_cluster.h b/kernel/power/tuxonice_cluster.h
new file mode 100644
index 0000000..cd9ee3a
--- /dev/null
+++ b/kernel/power/tuxonice_cluster.h
@@ -0,0 +1,19 @@
+/*
+ * kernel/power/tuxonice_cluster.h
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at tuxonice net)
+ * Copyright (C) 2006 Red Hat, inc.
+ *
+ * This file is released under the GPLv2.
+ */
+
+#ifdef CONFIG_TOI_CLUSTER
+extern int toi_cluster_init(void);
+extern void toi_cluster_exit(void);
+extern void toi_initiate_cluster_hibernate(void);
+#else
+static inline int toi_cluster_init(void) { return 0; }
+static inline void toi_cluster_exit(void) { }
+static inline void toi_initiate_cluster_hibernate(void) { }
+#endif
+
diff --git a/kernel/power/tuxonice_compress.c b/kernel/power/tuxonice_compress.c
new file mode 100644
index 0000000..d2bbae9
--- /dev/null
+++ b/kernel/power/tuxonice_compress.c
@@ -0,0 +1,441 @@
+/*
+ * kernel/power/compression.c
+ *
+ * Copyright (C) 2003-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * This file contains data compression routines for TuxOnIce,
+ * using cryptoapi.
+ */
+
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include <linux/highmem.h>
+#include <linux/vmalloc.h>
+#include <linux/crypto.h>
+
+#include "tuxonice_builtin.h"
+#include "tuxonice.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_io.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_alloc.h"
+
+static int toi_expected_compression;
+
+static struct toi_module_ops toi_compression_ops;
+static struct toi_module_ops *next_driver;
+
+static char toi_compressor_name[32] = "lzf";
+
+static DEFINE_MUTEX(stats_lock);
+
+struct cpu_context {
+       u8 *page_buffer;
+       struct crypto_comp *transform;
+       unsigned int len;
+       char *buffer_start;
+};
+
+static DEFINE_PER_CPU(struct cpu_context, contexts);
+
+static int toi_compress_prepare_result;
+
+/*
+ * toi_compress_cleanup
+ *
+ * Frees memory allocated for our labours.
+ */
+static void toi_compress_cleanup(int toi_or_resume)
+{
+       int cpu;
+
+       if (!toi_or_resume)
+               return;
+
+       for_each_online_cpu(cpu) {
+               struct cpu_context *this = &per_cpu(contexts, cpu);
+               if (this->transform) {
+                       crypto_free_comp(this->transform);
+                       this->transform = NULL;
+               }
+
+               if (this->page_buffer)
+                       toi_free_page(16, (unsigned long) this->page_buffer);
+
+               this->page_buffer = NULL;
+       }
+}
+
+/*
+ * toi_crypto_prepare
+ *
+ * Prepare to do some work by allocating buffers and transforms.
+ */
+static int toi_compress_crypto_prepare(void)
+{
+       int cpu;
+
+       if (!*toi_compressor_name) {
+               printk(KERN_INFO "TuxOnIce: Compression enabled but no "
+                               "compressor name set.\n");
+               return 1;
+       }
+
+       for_each_online_cpu(cpu) {
+               struct cpu_context *this = &per_cpu(contexts, cpu);
+               this->transform = crypto_alloc_comp(toi_compressor_name, 0, 0);
+               if (IS_ERR(this->transform)) {
+                       printk(KERN_INFO "TuxOnIce: Failed to initialise the "
+                                       "%s compression transform.\n",
+                                       toi_compressor_name);
+                       this->transform = NULL;
+                       return 1;
+               }
+
+               this->page_buffer =
+                       (char *) toi_get_zeroed_page(16, TOI_ATOMIC_GFP);
+
+               if (!this->page_buffer) {
+                       printk(KERN_ERR
+                         "Failed to allocate a page buffer for TuxOnIce "
+                         "encryption driver.\n");
+                       return -ENOMEM;
+               }
+       }
+
+       return 0;
+}
+
+/*
+ * toi_compress_init
+ */
+
+static int toi_compress_init(int toi_or_resume)
+{
+       if (!toi_or_resume)
+               return 0;
+
+       toi_compress_bytes_in = toi_compress_bytes_out = 0;
+
+       next_driver = toi_get_next_filter(&toi_compression_ops);
+
+       if (!next_driver)
+               return -ECHILD;
+
+       toi_compress_prepare_result = toi_compress_crypto_prepare();
+
+       return 0;
+}
+
+/*
+ * toi_compress_rw_init()
+ */
+
+int toi_compress_rw_init(int rw, int stream_number)
+{
+       if (toi_compress_prepare_result) {
+               printk("Failed to initialise compression algorithm.\n");
+               if (rw == READ)
+                       return -ENODEV;
+               else
+                       toi_compression_ops.enabled = 0;
+       }
+
+       return 0;
+}
+
+/*
+ * toi_compress_write_page()
+ *
+ * Compress a page of data, buffering output and passing on filled
+ * pages to the next module in the pipeline.
+ *
+ * Buffer_page:        Pointer to a buffer of size PAGE_SIZE, containing
+ * data to be compressed.
+ *
+ * Returns:    0 on success. Otherwise the error is that returned by later
+ *             modules, -ECHILD if we have a broken pipeline or -EIO if
+ *             zlib errs.
+ */
+static int toi_compress_write_page(unsigned long index,
+               struct page *buffer_page, unsigned int buf_size)
+{
+       int ret, cpu = smp_processor_id();
+       struct cpu_context *ctx = &per_cpu(contexts, cpu);
+
+       if (!ctx->transform)
+               return next_driver->write_page(index, buffer_page, buf_size);
+
+       ctx->buffer_start = kmap(buffer_page);
+
+       ctx->len = buf_size;
+
+       ret = crypto_comp_compress(ctx->transform,
+                       ctx->buffer_start, buf_size,
+                       ctx->page_buffer, &ctx->len);
+
+       kunmap(buffer_page);
+
+       if (ret) {
+               printk(KERN_INFO "Compression failed.\n");
+               goto failure;
+       }
+
+       mutex_lock(&stats_lock);
+       toi_compress_bytes_in += buf_size;
+       toi_compress_bytes_out += ctx->len;
+       mutex_unlock(&stats_lock);
+
+       if (ctx->len < buf_size) /* some compression */
+               ret = next_driver->write_page(index,
+                               virt_to_page(ctx->page_buffer),
+                               ctx->len);
+       else
+               ret = next_driver->write_page(index, buffer_page, buf_size);
+
+failure:
+       return ret;
+}
+
+/*
+ * toi_compress_read_page()
+ * @buffer_page: struct page *. Pointer to a buffer of size PAGE_SIZE.
+ *
+ * Retrieve data from later modules and decompress it until the input buffer
+ * is filled.
+ * Zero if successful. Error condition from me or from downstream on failure.
+ */
+static int toi_compress_read_page(unsigned long *index,
+               struct page *buffer_page, unsigned int *buf_size)
+{
+       int ret, cpu = smp_processor_id();
+       unsigned int len;
+       unsigned int outlen = PAGE_SIZE;
+       char *buffer_start;
+       struct cpu_context *ctx = &per_cpu(contexts, cpu);
+
+       if (!ctx->transform)
+               return next_driver->read_page(index, buffer_page, buf_size);
+
+       /*
+        * All our reads must be synchronous - we can't decompress
+        * data that hasn't been read yet.
+        */
+
+       *buf_size = PAGE_SIZE;
+
+       ret = next_driver->read_page(index, buffer_page, &len);
+
+       /* Error or uncompressed data */
+       if (ret || len == PAGE_SIZE)
+               return ret;
+
+       buffer_start = kmap(buffer_page);
+       memcpy(ctx->page_buffer, buffer_start, len);
+       ret = crypto_comp_decompress(
+                       ctx->transform,
+                       ctx->page_buffer,
+                       len, buffer_start, &outlen);
+       if (ret)
+               abort_hibernate(TOI_FAILED_IO,
+                       "Compress_read returned %d.\n", ret);
+       else if (outlen != PAGE_SIZE) {
+               abort_hibernate(TOI_FAILED_IO,
+                       "Decompression yielded %d bytes instead of %ld.\n",
+                       outlen, PAGE_SIZE);
+               printk("Decompression yielded %d bytes instead of %ld.\n",
+                       outlen, PAGE_SIZE);
+               ret = -EIO;
+               *buf_size = outlen;
+       }
+       kunmap(buffer_page);
+       return ret;
+}
+
+/*
+ * toi_compress_print_debug_stats
+ * @buffer: Pointer to a buffer into which the debug info will be printed.
+ * @size: Size of the buffer.
+ *
+ * Print information to be recorded for debugging purposes into a buffer.
+ * Returns: Number of characters written to the buffer.
+ */
+
+static int toi_compress_print_debug_stats(char *buffer, int size)
+{
+       unsigned long pages_in = toi_compress_bytes_in >> PAGE_SHIFT,
+                     pages_out = toi_compress_bytes_out >> PAGE_SHIFT;
+       int len;
+
+       /* Output the compression ratio achieved. */
+       if (*toi_compressor_name)
+               len = snprintf_used(buffer, size, "- Compressor is '%s'.\n",
+                               toi_compressor_name);
+       else
+               len = snprintf_used(buffer, size, "- Compressor is not set.\n");
+
+       if (pages_in)
+               len += snprintf_used(buffer+len, size - len,
+                 "  Compressed %lu bytes into %lu (%d percent compression).\n",
+                 toi_compress_bytes_in,
+                 toi_compress_bytes_out,
+                 (pages_in - pages_out) * 100 / pages_in);
+       return len;
+}
+
+/*
+ * toi_compress_compression_memory_needed
+ *
+ * Tell the caller how much memory we need to operate during hibernate/resume.
+ * Returns: Unsigned long. Maximum number of bytes of memory required for
+ * operation.
+ */
+static int toi_compress_memory_needed(void)
+{
+       return 2 * PAGE_SIZE;
+}
+
+static int toi_compress_storage_needed(void)
+{
+       return 4 * sizeof(unsigned long) + strlen(toi_compressor_name) + 1;
+}
+
+/*
+ * toi_compress_save_config_info
+ * @buffer: Pointer to a buffer of size PAGE_SIZE.
+ *
+ * Save informaton needed when reloading the image at resume time.
+ * Returns: Number of bytes used for saving our data.
+ */
+static int toi_compress_save_config_info(char *buffer)
+{
+       int namelen = strlen(toi_compressor_name) + 1;
+       int total_len;
+
+       *((unsigned long *) buffer) = toi_compress_bytes_in;
+       *((unsigned long *) (buffer + 1 * sizeof(unsigned long))) =
+               toi_compress_bytes_out;
+       *((unsigned long *) (buffer + 2 * sizeof(unsigned long))) =
+               toi_expected_compression;
+       *((unsigned long *) (buffer + 3 * sizeof(unsigned long))) = namelen;
+       strncpy(buffer + 4 * sizeof(unsigned long), toi_compressor_name,
+                                                               namelen);
+       total_len = 4 * sizeof(unsigned long) + namelen;
+       return total_len;
+}
+
+/* toi_compress_load_config_info
+ * @buffer: Pointer to the start of the data.
+ * @size: Number of bytes that were saved.
+ *
+ * Description:        Reload information needed for decompressing the image at
+ * resume time.
+ */
+static void toi_compress_load_config_info(char *buffer, int size)
+{
+       int namelen;
+
+       toi_compress_bytes_in = *((unsigned long *) buffer);
+       toi_compress_bytes_out = *((unsigned long *) (buffer + 1 *
+                               sizeof(unsigned long)));
+       toi_expected_compression = *((unsigned long *) (buffer + 2 *
+                               sizeof(unsigned long)));
+       namelen = *((unsigned long *) (buffer + 3 * sizeof(unsigned long)));
+       if (strncmp(toi_compressor_name, buffer + 4 * sizeof(unsigned long),
+                               namelen)) {
+               toi_compress_cleanup(1);
+               strncpy(toi_compressor_name, buffer + 4 * sizeof(unsigned long),
+                       namelen);
+               toi_compress_crypto_prepare();
+       }
+       return;
+}
+
+/*
+ * toi_expected_compression_ratio
+ *
+ * Description:        Returns the expected ratio between data passed into this module
+ *             and the amount of data output when writing.
+ * Returns:    100 if the module is disabled. Otherwise the value set by the
+ *             user via our sysfs entry.
+ */
+
+static int toi_compress_expected_ratio(void)
+{
+       if (!toi_compression_ops.enabled)
+               return 100;
+       else
+               return 100 - toi_expected_compression;
+}
+
+/*
+ * data for our sysfs entries.
+ */
+static struct toi_sysfs_data sysfs_params[] = {
+       {
+               TOI_ATTR("expected_compression", SYSFS_RW),
+               SYSFS_INT(&toi_expected_compression, 0, 99, 0)
+       },
+
+       {
+               TOI_ATTR("enabled", SYSFS_RW),
+               SYSFS_INT(&toi_compression_ops.enabled, 0, 1, 0)
+       },
+
+       {
+               TOI_ATTR("algorithm", SYSFS_RW),
+               SYSFS_STRING(toi_compressor_name, 31, 0)
+       }
+};
+
+/*
+ * Ops structure.
+ */
+static struct toi_module_ops toi_compression_ops = {
+       .type                   = FILTER_MODULE,
+       .name                   = "compression",
+       .directory              = "compression",
+       .module                 = THIS_MODULE,
+       .initialise             = toi_compress_init,
+       .cleanup                = toi_compress_cleanup,
+       .memory_needed          = toi_compress_memory_needed,
+       .print_debug_info       = toi_compress_print_debug_stats,
+       .save_config_info       = toi_compress_save_config_info,
+       .load_config_info       = toi_compress_load_config_info,
+       .storage_needed         = toi_compress_storage_needed,
+       .expected_compression   = toi_compress_expected_ratio,
+
+       .rw_init                = toi_compress_rw_init,
+
+       .write_page             = toi_compress_write_page,
+       .read_page              = toi_compress_read_page,
+
+       .sysfs_data             = sysfs_params,
+       .num_sysfs_entries      = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+/* ---- Registration ---- */
+
+static __init int toi_compress_load(void)
+{
+       return toi_register_module(&toi_compression_ops);
+}
+
+#ifdef MODULE
+static __exit void toi_compress_unload(void)
+{
+       toi_unregister_module(&toi_compression_ops);
+}
+
+module_init(toi_compress_load);
+module_exit(toi_compress_unload);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("Compression Support for TuxOnIce");
+#else
+late_initcall(toi_compress_load);
+#endif
diff --git a/kernel/power/tuxonice_extent.c b/kernel/power/tuxonice_extent.c
new file mode 100644
index 0000000..afeb11d
--- /dev/null
+++ b/kernel/power/tuxonice_extent.c
@@ -0,0 +1,303 @@
+/*
+ * kernel/power/tuxonice_extent.c
+ *
+ * Copyright (C) 2003-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * Distributed under GPLv2.
+ *
+ * These functions encapsulate the manipulation of storage metadata. For
+ * pageflags, we use dynamically allocated bitmaps.
+ */
+
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include "tuxonice_modules.h"
+#include "tuxonice_extent.h"
+#include "tuxonice_alloc.h"
+#include "tuxonice_ui.h"
+#include "tuxonice.h"
+
+/* toi_get_extent
+ *
+ * Returns a free extent. May fail, returning NULL instead.
+ */
+static struct hibernate_extent *toi_get_extent(void)
+{
+       return (struct hibernate_extent *) toi_kzalloc(2,
+                       sizeof(struct hibernate_extent), TOI_ATOMIC_GFP);
+}
+
+/* toi_put_extent_chain.
+ *
+ * Frees a whole chain of extents.
+ */
+void toi_put_extent_chain(struct hibernate_extent_chain *chain)
+{
+       struct hibernate_extent *this;
+
+       this = chain->first;
+
+       while (this) {
+               struct hibernate_extent *next = this->next;
+               toi_kfree(2, this);
+               chain->num_extents--;
+               this = next;
+       }
+
+       chain->first = NULL;
+       chain->last_touched = NULL;
+       chain->size = 0;
+}
+
+/*
+ * toi_add_to_extent_chain
+ *
+ * Add an extent to an existing chain.
+ */
+int toi_add_to_extent_chain(struct hibernate_extent_chain *chain,
+               unsigned long start, unsigned long end)
+{
+       struct hibernate_extent *new_ext = NULL, *cur_ext = NULL;
+
+       /* Find the right place in the chain */
+       if (chain->last_touched && chain->last_touched->start < start)
+               cur_ext = chain->last_touched;
+       else if (chain->first && chain->first->start < start)
+               cur_ext = chain->first;
+
+       if (cur_ext) {
+               while (cur_ext->next && cur_ext->next->start < start)
+                       cur_ext = cur_ext->next;
+
+               if (cur_ext->end == (start - 1)) {
+                       struct hibernate_extent *next_ext = cur_ext->next;
+                       cur_ext->end = end;
+
+                       /* Merge with the following one? */
+                       if (next_ext && cur_ext->end + 1 == next_ext->start) {
+                               cur_ext->end = next_ext->end;
+                               cur_ext->next = next_ext->next;
+                               toi_kfree(2, next_ext);
+                               chain->num_extents--;
+                       }
+
+                       chain->last_touched = cur_ext;
+                       chain->size += (end - start + 1);
+
+                       return 0;
+               }
+       }
+
+       new_ext = toi_get_extent();
+       if (!new_ext) {
+               printk(KERN_INFO "Error unable to append a new extent to the "
+                               "chain.\n");
+               return -ENOMEM;
+       }
+
+       chain->num_extents++;
+       chain->size += (end - start + 1);
+       new_ext->start = start;
+       new_ext->end = end;
+
+       chain->last_touched = new_ext;
+
+       if (cur_ext) {
+               new_ext->next = cur_ext->next;
+               cur_ext->next = new_ext;
+       } else {
+               if (chain->first)
+                       new_ext->next = chain->first;
+               chain->first = new_ext;
+       }
+
+       return 0;
+}
+
+/* toi_serialise_extent_chain
+ *
+ * Write a chain in the image.
+ */
+int toi_serialise_extent_chain(struct toi_module_ops *owner,
+               struct hibernate_extent_chain *chain)
+{
+       struct hibernate_extent *this;
+       int ret, i = 0;
+
+       ret = toiActiveAllocator->rw_header_chunk(WRITE, owner, (char *) chain,
+                       2 * sizeof(int));
+       if (ret)
+               return ret;
+
+       this = chain->first;
+       while (this) {
+               ret = toiActiveAllocator->rw_header_chunk(WRITE, owner,
+                               (char *) this, 2 * sizeof(unsigned long));
+               if (ret)
+                       return ret;
+               this = this->next;
+               i++;
+       }
+
+       if (i != chain->num_extents) {
+               printk(KERN_EMERG "Saved %d extents but chain metadata says "
+                       "there should be %d.\n", i, chain->num_extents);
+               return 1;
+       }
+
+       return ret;
+}
+
+/* toi_load_extent_chain
+ *
+ * Read back a chain saved in the image.
+ */
+int toi_load_extent_chain(struct hibernate_extent_chain *chain)
+{
+       struct hibernate_extent *this, *last = NULL;
+       int i, ret;
+
+       ret = toiActiveAllocator->rw_header_chunk_noreadahead(READ, NULL,
+                       (char *) chain, 2 * sizeof(int));
+       if (ret) {
+               printk("Failed to read size of extent chain.\n");
+               return 1;
+       }
+
+       for (i = 0; i < chain->num_extents; i++) {
+               this = toi_kzalloc(3, sizeof(struct hibernate_extent),
+                               TOI_ATOMIC_GFP);
+               if (!this) {
+                       printk(KERN_INFO "Failed to allocate a new extent.\n");
+                       return -ENOMEM;
+               }
+               this->next = NULL;
+               ret = toiActiveAllocator->rw_header_chunk_noreadahead(READ,
+                               NULL, (char *) this, 2 * sizeof(unsigned long));
+               if (ret) {
+                       printk(KERN_INFO "Failed to an extent.\n");
+                       return 1;
+               }
+               if (last)
+                       last->next = this;
+               else
+                       chain->first = this;
+               last = this;
+       }
+       return 0;
+}
+
+/* toi_extent_state_next
+ *
+ * Given a state, progress to the next valid entry. We may begin in an
+ * invalid state, as we do when invoked after extent_state_goto_start below.
+ *
+ * When using compression and expected_compression > 0, we let the image size
+ * be larger than storage, so we can validly run out of data to return.
+ */
+unsigned long toi_extent_state_next(struct hibernate_extent_iterate_state *state)
+{
+       if (state->current_chain == state->num_chains)
+               return 0;
+
+       if (state->current_extent) {
+               if (state->current_offset == state->current_extent->end) {
+                       if (state->current_extent->next) {
+                               state->current_extent =
+                                       state->current_extent->next;
+                               state->current_offset =
+                                       state->current_extent->start;
+                       } else {
+                               state->current_extent = NULL;
+                               state->current_offset = 0;
+                       }
+               } else
+                       state->current_offset++;
+       }
+
+       while (!state->current_extent) {
+               int chain_num = ++(state->current_chain);
+
+               if (chain_num == state->num_chains)
+                       return 0;
+
+               state->current_extent = (state->chains + chain_num)->first;
+
+               if (!state->current_extent)
+                       continue;
+
+               state->current_offset = state->current_extent->start;
+       }
+
+       return state->current_offset;
+}
+
+/* toi_extent_state_goto_start
+ *
+ * Find the first valid value in a group of chains.
+ */
+void toi_extent_state_goto_start(struct hibernate_extent_iterate_state *state)
+{
+       state->current_chain = -1;
+       state->current_extent = NULL;
+       state->current_offset = 0;
+}
+
+/* toi_extent_start_save
+ *
+ * Given a state and a struct hibernate_extent_state_store, save the current
+ * position in a format that can be used with relocated chains (at
+ * resume time).
+ */
+void toi_extent_state_save(struct hibernate_extent_iterate_state *state,
+               struct hibernate_extent_iterate_saved_state *saved_state)
+{
+       struct hibernate_extent *extent;
+
+       saved_state->chain_num = state->current_chain;
+       saved_state->extent_num = 0;
+       saved_state->offset = state->current_offset;
+
+       if (saved_state->chain_num == -1)
+               return;
+
+       extent = (state->chains + state->current_chain)->first;
+
+       while (extent != state->current_extent) {
+               saved_state->extent_num++;
+               extent = extent->next;
+       }
+}
+
+/* toi_extent_start_restore
+ *
+ * Restore the position saved by extent_state_save.
+ */
+void toi_extent_state_restore(struct hibernate_extent_iterate_state *state,
+               struct hibernate_extent_iterate_saved_state *saved_state)
+{
+       int posn = saved_state->extent_num;
+
+       if (saved_state->chain_num == -1) {
+               toi_extent_state_goto_start(state);
+               return;
+       }
+
+       state->current_chain = saved_state->chain_num;
+       state->current_extent = (state->chains + state->current_chain)->first;
+       state->current_offset = saved_state->offset;
+
+       while (posn--)
+               state->current_extent = state->current_extent->next;
+}
+
+#ifdef CONFIG_TOI_EXPORTS
+EXPORT_SYMBOL_GPL(toi_add_to_extent_chain);
+EXPORT_SYMBOL_GPL(toi_put_extent_chain);
+EXPORT_SYMBOL_GPL(toi_load_extent_chain);
+EXPORT_SYMBOL_GPL(toi_serialise_extent_chain);
+EXPORT_SYMBOL_GPL(toi_extent_state_save);
+EXPORT_SYMBOL_GPL(toi_extent_state_restore);
+EXPORT_SYMBOL_GPL(toi_extent_state_goto_start);
+EXPORT_SYMBOL_GPL(toi_extent_state_next);
+#endif
diff --git a/kernel/power/tuxonice_extent.h b/kernel/power/tuxonice_extent.h
new file mode 100644
index 0000000..dc0e05e
--- /dev/null
+++ b/kernel/power/tuxonice_extent.h
@@ -0,0 +1,72 @@
+/*
+ * kernel/power/tuxonice_extent.h
+ *
+ * Copyright (C) 2003-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It contains declarations related to extents. Extents are
+ * TuxOnIce's method of storing some of the metadata for the image.
+ * See tuxonice_extent.c for more info.
+ *
+ */
+
+#include "tuxonice_modules.h"
+
+#ifndef EXTENT_H
+#define EXTENT_H
+
+struct hibernate_extent {
+       unsigned long start, end;
+       struct hibernate_extent *next;
+};
+
+struct hibernate_extent_chain {
+       int size; /* size of the chain ie sum (max-min+1) */
+       int num_extents;
+       struct hibernate_extent *first, *last_touched;
+};
+
+struct hibernate_extent_iterate_state {
+       struct hibernate_extent_chain *chains;
+       int num_chains;
+       int current_chain;
+       struct hibernate_extent *current_extent;
+       unsigned long current_offset;
+};
+
+struct hibernate_extent_iterate_saved_state {
+       int chain_num;
+       int extent_num;
+       unsigned long offset;
+};
+
+#define toi_extent_state_eof(state) \
+       ((state)->num_chains == (state)->current_chain)
+
+/* Simplify iterating through all the values in an extent chain */
+#define toi_extent_for_each(extent_chain, extentpointer, value) \
+if ((extent_chain)->first) \
+       for ((extentpointer) = (extent_chain)->first, (value) = \
+                       (extentpointer)->start; \
+            ((extentpointer) && ((extentpointer)->next || (value) <= \
+                                (extentpointer)->end)); \
+            (((value) == (extentpointer)->end) ? \
+               ((extentpointer) = (extentpointer)->next, (value) = \
+                ((extentpointer) ? (extentpointer)->start : 0)) : \
+                       (value)++))
+
+void toi_put_extent_chain(struct hibernate_extent_chain *chain);
+int toi_add_to_extent_chain(struct hibernate_extent_chain *chain,
+               unsigned long start, unsigned long end);
+int toi_serialise_extent_chain(struct toi_module_ops *owner,
+               struct hibernate_extent_chain *chain);
+int toi_load_extent_chain(struct hibernate_extent_chain *chain);
+
+void toi_extent_state_save(struct hibernate_extent_iterate_state *state,
+               struct hibernate_extent_iterate_saved_state *saved_state);
+void toi_extent_state_restore(struct hibernate_extent_iterate_state *state,
+               struct hibernate_extent_iterate_saved_state *saved_state);
+void toi_extent_state_goto_start(struct hibernate_extent_iterate_state *state);
+unsigned long toi_extent_state_next(struct hibernate_extent_iterate_state *state);
+#endif
diff --git a/kernel/power/tuxonice_file.c b/kernel/power/tuxonice_file.c
new file mode 100644
index 0000000..15a57e2
--- /dev/null
+++ b/kernel/power/tuxonice_file.c
@@ -0,0 +1,1125 @@
+/*
+ * kernel/power/tuxonice_file.c
+ *
+ * Copyright (C) 2005-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * Distributed under GPLv2.
+ *
+ * This file encapsulates functions for usage of a simple file as a
+ * backing store. It is based upon the swapallocator, and shares the
+ * same basic working. Here, though, we have nothing to do with
+ * swapspace, and only one device to worry about.
+ *
+ * The user can just
+ *
+ * echo TuxOnIce > /path/to/my_file
+ *
+ * dd if=/dev/zero bs=1M count=<file_size_desired> >> /path/to/my_file
+ *
+ * and
+ *
+ * echo /path/to/my_file > /sys/power/tuxonice/file/target
+ *
+ * then put what they find in /sys/power/tuxonice/resume
+ * as their resume= parameter in lilo.conf (and rerun lilo if using it).
+ *
+ * Having done this, they're ready to hibernate and resume.
+ *
+ * TODO:
+ * - File resizing.
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/mount.h>
+#include <linux/statfs.h>
+#include <linux/syscalls.h>
+#include <linux/namei.h>
+#include <linux/fs.h>
+#include <linux/root_dev.h>
+
+#include "tuxonice.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_extent.h"
+#include "tuxonice_io.h"
+#include "tuxonice_storage.h"
+#include "tuxonice_block_io.h"
+#include "tuxonice_alloc.h"
+
+static struct toi_module_ops toi_fileops;
+
+/* Details of our target.  */
+
+char toi_file_target[256];
+static struct inode *target_inode;
+static struct file *target_file;
+static struct block_device *toi_file_target_bdev;
+static dev_t resume_file_dev_t;
+static int used_devt;
+static int setting_toi_file_target;
+static sector_t target_firstblock, target_header_start;
+static int target_storage_available;
+static int target_claim;
+
+/* Old signatures */
+static char HaveImage[] = "HaveImage\n";
+static char NoImage[] =   "TuxOnIce\n";
+#define sig_size (sizeof(HaveImage) + 1)
+
+struct toi_file_header {
+       char sig[sig_size];
+       int resumed_before;
+       unsigned long first_header_block;
+       int have_image;
+};
+
+/* Header Page Information */
+static int header_pages_reserved;
+
+/* Main Storage Pages */
+static int main_pages_allocated, main_pages_requested;
+
+#define target_is_normal_file() (S_ISREG(target_inode->i_mode))
+
+static struct toi_bdev_info devinfo;
+
+/* Extent chain for blocks */
+static struct hibernate_extent_chain block_chain;
+
+/* Signature operations */
+enum {
+       GET_IMAGE_EXISTS,
+       INVALIDATE,
+       MARK_RESUME_ATTEMPTED,
+       UNMARK_RESUME_ATTEMPTED,
+};
+
+static void set_devinfo(struct block_device *bdev, int target_blkbits)
+{
+       devinfo.bdev = bdev;
+       if (!target_blkbits) {
+               devinfo.bmap_shift = devinfo.blocks_per_page = 0;
+       } else {
+               devinfo.bmap_shift = target_blkbits - 9;
+               devinfo.blocks_per_page = (1 << (PAGE_SHIFT - target_blkbits));
+       }
+}
+
+static long raw_to_real(long raw)
+{
+       long result;
+
+       result = raw - (raw * (sizeof(unsigned long) + sizeof(int)) +
+               (PAGE_SIZE + sizeof(unsigned long) + sizeof(int) + 1)) /
+               (PAGE_SIZE + sizeof(unsigned long) + sizeof(int));
+
+       return result < 0 ? 0 : result;
+}
+
+static int toi_file_storage_available(void)
+{
+       int result = 0;
+       struct block_device *bdev = toi_file_target_bdev;
+
+       if (!target_inode)
+               return 0;
+
+       switch (target_inode->i_mode & S_IFMT) {
+       case S_IFSOCK:
+       case S_IFCHR:
+       case S_IFIFO: /* Socket, Char, Fifo */
+               return -1;
+       case S_IFREG: /* Regular file: current size - holes + free
+                        space on part */
+               result = target_storage_available;
+               break;
+       case S_IFBLK: /* Block device */
+               if (!bdev->bd_disk) {
+                       printk(KERN_INFO "bdev->bd_disk null.\n");
+                       return 0;
+               }
+
+               result = (bdev->bd_part ?
+                       bdev->bd_part->nr_sects :
+                       bdev->bd_disk->capacity) >> (PAGE_SHIFT - 9);
+       }
+
+       return raw_to_real(result);
+}
+
+static int has_contiguous_blocks(int page_num)
+{
+       int j;
+       sector_t last = 0;
+
+       for (j = 0; j < devinfo.blocks_per_page; j++) {
+               sector_t this = bmap(target_inode,
+                               page_num * devinfo.blocks_per_page + j);
+
+               if (!this || (last && (last + 1) != this))
+                       break;
+
+               last = this;
+       }
+
+       return j == devinfo.blocks_per_page;
+}
+
+static int size_ignoring_ignored_pages(void)
+{
+       int mappable = 0, i;
+
+       if (!target_is_normal_file())
+               return toi_file_storage_available();
+
+       for (i = 0; i < (target_inode->i_size >> PAGE_SHIFT) ; i++)
+               if (has_contiguous_blocks(i))
+                       mappable++;
+
+       return mappable;
+}
+
+static int __populate_block_list(int min, int max)
+{
+       if (test_action_state(TOI_TEST_BIO))
+               printk(KERN_INFO "Adding extent %d-%d.\n",
+                       min << devinfo.bmap_shift,
+                       ((max + 1) << devinfo.bmap_shift) - 1);
+
+       return toi_add_to_extent_chain(&block_chain, min, max);
+}
+
+static int apply_header_reservation(void)
+{
+       int i;
+
+       /* Apply header space reservation */
+       toi_extent_state_goto_start(&toi_writer_posn);
+       toi_bio_ops.forward_one_page(1); /* To first page */
+
+       for (i = 0; i < header_pages_reserved; i++)
+               if (toi_bio_ops.forward_one_page(1))
+                       return -ENOSPC;
+
+       /* The end of header pages will be the start of pageset 2 */
+       toi_extent_state_save(&toi_writer_posn, &toi_writer_posn_save[2]);
+
+       return 0;
+}
+
+static int populate_block_list(void)
+{
+       int i, extent_min = -1, extent_max = -1, got_header = 0, result = 0;
+
+       if (block_chain.first)
+               toi_put_extent_chain(&block_chain);
+
+       if (!target_is_normal_file()) {
+               return (target_storage_available > 0) ?
+                       __populate_block_list(devinfo.blocks_per_page,
+                               (target_storage_available + 1) *
+                               devinfo.blocks_per_page - 1) : 0;
+       }
+
+       for (i = 0; i < (target_inode->i_size >> PAGE_SHIFT); i++) {
+               sector_t new_sector;
+
+               if (!has_contiguous_blocks(i))
+                       continue;
+
+               new_sector = bmap(target_inode,
+               (i * devinfo.blocks_per_page));
+
+               /*
+                * Ignore the first block in the file.
+                * It gets the header.
+                */
+               if (new_sector == target_firstblock >> devinfo.bmap_shift) {
+                       got_header = 1;
+                       continue;
+               }
+
+               /*
+                * I'd love to be able to fill in holes and resize
+                * files, but not yet...
+                */
+
+               if (new_sector == extent_max + 1)
+                       extent_max += devinfo.blocks_per_page;
+               else {
+                       if (extent_min > -1) {
+                               result = __populate_block_list(extent_min,
+                                               extent_max);
+                               if (result)
+                                       return result;
+                       }
+
+                       extent_min = new_sector;
+                       extent_max = extent_min +
+                               devinfo.blocks_per_page - 1;
+               }
+       }
+
+       if (extent_min > -1) {
+               result = __populate_block_list(extent_min, extent_max);
+               if (result)
+                       return result;
+       }
+
+       return apply_header_reservation();
+}
+
+static void toi_file_cleanup(int finishing_cycle)
+{
+       if (toi_file_target_bdev) {
+               if (target_claim) {
+                       bd_release(toi_file_target_bdev);
+                       target_claim = 0;
+               }
+
+               if (used_devt) {
+                       blkdev_put(toi_file_target_bdev);
+                       used_devt = 0;
+               }
+               toi_file_target_bdev = NULL;
+               target_inode = NULL;
+               set_devinfo(NULL, 0);
+               target_storage_available = 0;
+       }
+
+       if (target_file > 0) {
+               filp_close(target_file, NULL);
+               target_file = NULL;
+       }
+}
+
+/*
+ * reopen_resume_devt
+ *
+ * Having opened resume= once, we remember the major and
+ * minor nodes and use them to reopen the bdev for checking
+ * whether an image exists (possibly when starting a resume).
+ */
+static void reopen_resume_devt(void)
+{
+       toi_file_target_bdev = toi_open_by_devnum(resume_file_dev_t,
+                       FMODE_READ);
+       if (IS_ERR(toi_file_target_bdev)) {
+               printk(KERN_INFO "Got a dev_num (%lx) but failed to open it.\n",
+                               (unsigned long) resume_file_dev_t);
+               return;
+       }
+       target_inode = toi_file_target_bdev->bd_inode;
+       set_devinfo(toi_file_target_bdev, target_inode->i_blkbits);
+}
+
+static void toi_file_get_target_info(char *target, int get_size,
+               int resume_param)
+{
+       if (target_file)
+               toi_file_cleanup(0);
+
+       if (!target || !strlen(target))
+               return;
+
+       target_file = filp_open(target, O_RDWR|O_LARGEFILE, 0);
+
+       if (IS_ERR(target_file) || !target_file) {
+
+               if (!resume_param) {
+                       printk(KERN_INFO "Open file %s returned %p.\n",
+                                       target, target_file);
+                       target_file = NULL;
+                       return;
+               }
+
+               target_file = NULL;
+               resume_file_dev_t = name_to_dev_t(target);
+               if (!resume_file_dev_t) {
+                       struct kstat stat;
+                       int error = vfs_stat(target, &stat);
+                       printk(KERN_INFO "Open file %s returned %p and "
+                                       "name_to_devt failed.\n", target,
+                                       target_file);
+                       if (error)
+                               printk(KERN_INFO "Stating the file also failed."
+                                       " Nothing more we can do.\n");
+                       else
+                               resume_file_dev_t = stat.rdev;
+                       return;
+               }
+
+               toi_file_target_bdev = toi_open_by_devnum(resume_file_dev_t,
+                               FMODE_READ);
+               if (IS_ERR(toi_file_target_bdev)) {
+                       printk(KERN_INFO "Got a dev_num (%lx) but failed to "
+                                       "open it.\n",
+                                       (unsigned long) resume_file_dev_t);
+                       return;
+               }
+               used_devt = 1;
+               target_inode = toi_file_target_bdev->bd_inode;
+       } else
+               target_inode = target_file->f_mapping->host;
+
+       if (S_ISLNK(target_inode->i_mode) || S_ISDIR(target_inode->i_mode) ||
+           S_ISSOCK(target_inode->i_mode) || S_ISFIFO(target_inode->i_mode)) {
+               printk(KERN_INFO "File support works with regular files,"
+                               " character files and block devices.\n");
+               goto cleanup;
+       }
+
+       if (!used_devt) {
+               if (S_ISBLK(target_inode->i_mode)) {
+                       toi_file_target_bdev = I_BDEV(target_inode);
+                       if (!bd_claim(toi_file_target_bdev, &toi_fileops))
+                               target_claim = 1;
+               } else
+                       toi_file_target_bdev = target_inode->i_sb->s_bdev;
+               resume_file_dev_t = toi_file_target_bdev->bd_dev;
+       }
+
+       set_devinfo(toi_file_target_bdev, target_inode->i_blkbits);
+
+       if (get_size)
+               target_storage_available = size_ignoring_ignored_pages();
+
+       if (!resume_param)
+               target_firstblock = bmap(target_inode, 0) << devinfo.bmap_shift;
+
+       return;
+cleanup:
+       target_inode = NULL;
+       if (target_file) {
+               filp_close(target_file, NULL);
+               target_file = NULL;
+       }
+       set_devinfo(NULL, 0);
+       target_storage_available = 0;
+}
+
+static void toi_file_noresume_reset(void)
+{
+       toi_bio_ops.rw_cleanup(READ);
+}
+
+static int parse_signature(struct toi_file_header *header)
+{
+       int have_image = !memcmp(HaveImage, header->sig, sizeof(HaveImage) - 1);
+       int no_image_header = !memcmp(NoImage, header->sig,
+                       sizeof(NoImage) - 1);
+       int binary_sig = !memcmp(tuxonice_signature, header->sig,
+                       sizeof(tuxonice_signature));
+
+       if (no_image_header || (binary_sig && !header->have_image))
+               return 0;
+
+       if (!have_image && !binary_sig)
+               return -1;
+
+       if (header->resumed_before)
+               set_toi_state(TOI_RESUMED_BEFORE);
+       else
+               clear_toi_state(TOI_RESUMED_BEFORE);
+
+       target_header_start = header->first_header_block;
+       return 1;
+}
+
+/* prepare_signature */
+
+static int prepare_signature(struct toi_file_header *current_header,
+               unsigned long first_header_block)
+{
+       strncpy(current_header->sig, tuxonice_signature,
+                       sizeof(tuxonice_signature));
+       current_header->resumed_before = 0;
+       current_header->first_header_block = first_header_block;
+       current_header->have_image = 1;
+       return 0;
+}
+
+static int toi_file_storage_allocated(void)
+{
+       if (!target_inode)
+               return 0;
+
+       if (target_is_normal_file())
+               return (int) raw_to_real(target_storage_available);
+       else
+               return (int) raw_to_real(main_pages_requested);
+}
+
+static int toi_file_release_storage(void)
+{
+       if (test_action_state(TOI_KEEP_IMAGE) &&
+           test_toi_state(TOI_NOW_RESUMING))
+               return 0;
+
+       toi_put_extent_chain(&block_chain);
+
+       header_pages_reserved = 0;
+       main_pages_allocated = 0;
+       main_pages_requested = 0;
+       return 0;
+}
+
+static void toi_file_reserve_header_space(int request)
+{
+       header_pages_reserved = request;
+       apply_header_reservation();
+}
+
+static int toi_file_allocate_storage(int main_space_requested)
+{
+       int result = 0;
+
+       int extra_pages = DIV_ROUND_UP(main_space_requested *
+                       (sizeof(unsigned long) + sizeof(int)), PAGE_SIZE);
+       int pages_to_get = main_space_requested + extra_pages +
+               header_pages_reserved;
+       int blocks_to_get = pages_to_get - block_chain.size;
+
+       /* Only release_storage reduces the size */
+       if (blocks_to_get < 1)
+               return 0;
+
+       result = populate_block_list();
+
+       if (result)
+               return result;
+
+       toi_message(TOI_WRITER, TOI_MEDIUM, 0,
+               "Finished with block_chain.size == %d.\n",
+               block_chain.size);
+
+       if (block_chain.size < pages_to_get) {
+               printk("Block chain size (%d) < header pages (%d) + extra "
+                       "pages (%d) + main pages (%d) (=%d pages).\n",
+                       block_chain.size, header_pages_reserved, extra_pages,
+                       main_space_requested, pages_to_get);
+               result = -ENOSPC;
+       }
+
+       main_pages_requested = main_space_requested;
+       main_pages_allocated = main_space_requested + extra_pages;
+       return result;
+}
+
+static int toi_file_write_header_init(void)
+{
+       int result;
+
+       toi_bio_ops.rw_init(WRITE, 0);
+       toi_writer_buffer_posn = 0;
+
+       /* Info needed to bootstrap goes at the start of the header.
+        * First we save the basic info needed for reading, including the number
+        * of header pages. Then we save the structs containing data needed
+        * for reading the header pages back.
+        * Note that even if header pages take more than one page, when we
+        * read back the info, we will have restored the location of the
+        * next header page by the time we go to use it.
+        */
+
+       result = toi_bio_ops.rw_header_chunk(WRITE, &toi_fileops,
+                       (char *) &toi_writer_posn_save,
+                       sizeof(toi_writer_posn_save));
+
+       if (result)
+               return result;
+
+       result = toi_bio_ops.rw_header_chunk(WRITE, &toi_fileops,
+                       (char *) &devinfo, sizeof(devinfo));
+
+       if (result)
+               return result;
+
+       toi_serialise_extent_chain(&toi_fileops, &block_chain);
+
+       return 0;
+}
+
+static int toi_file_write_header_cleanup(void)
+{
+       struct toi_file_header *header;
+       int result;
+       unsigned long sig_page = toi_get_zeroed_page(38, TOI_ATOMIC_GFP);
+
+       /* Write any unsaved data */
+       if (toi_writer_buffer_posn)
+               toi_bio_ops.write_header_chunk_finish();
+
+       toi_bio_ops.finish_all_io();
+
+       toi_extent_state_goto_start(&toi_writer_posn);
+       toi_bio_ops.forward_one_page(1);
+
+       /* Adjust image header */
+       result = toi_bio_ops.bdev_page_io(READ, toi_file_target_bdev,
+                       target_firstblock,
+                       virt_to_page(sig_page));
+       if (result)
+               goto out;
+
+       header = (struct toi_file_header *) sig_page;
+
+       prepare_signature(header,
+                       toi_writer_posn.current_offset <<
+                       devinfo.bmap_shift);
+
+       result = toi_bio_ops.bdev_page_io(WRITE, toi_file_target_bdev,
+                       target_firstblock,
+                       virt_to_page(sig_page));
+
+out:
+       toi_bio_ops.finish_all_io();
+       toi_free_page(38, sig_page);
+
+       return result;
+}
+
+/* HEADER READING */
+
+/*
+ * read_header_init()
+ *
+ * Description:
+ * 1. Attempt to read the device specified with resume=.
+ * 2. Check the contents of the header for our signature.
+ * 3. Warn, ignore, reset and/or continue as appropriate.
+ * 4. If continuing, read the toi_file configuration section
+ *    of the header and set up block device info so we can read
+ *    the rest of the header & image.
+ *
+ * Returns:
+ * May not return if user choose to reboot at a warning.
+ * -EINVAL if cannot resume at this time. Booting should continue
+ * normally.
+ */
+
+static int toi_file_read_header_init(void)
+{
+       int result;
+       struct block_device *tmp;
+
+       toi_bio_ops.read_header_init();
+
+       /* Read toi_file configuration */
+       result = toi_bio_ops.bdev_page_io(READ, toi_file_target_bdev,
+                       target_header_start,
+                       virt_to_page((unsigned long) toi_writer_buffer));
+
+       if (result) {
+               printk("FileAllocator read header init: Failed to initialise "
+                               "reading the first page of data.\n");
+               toi_bio_ops.rw_cleanup(READ);
+               return result;
+       }
+
+       memcpy(&toi_writer_posn_save, toi_writer_buffer,
+              sizeof(toi_writer_posn_save));
+
+       toi_writer_buffer_posn = sizeof(toi_writer_posn_save);
+
+       tmp = devinfo.bdev;
+
+       memcpy(&devinfo,
+              toi_writer_buffer + toi_writer_buffer_posn,
+              sizeof(devinfo));
+
+       devinfo.bdev = tmp;
+       toi_writer_buffer_posn += sizeof(devinfo);
+
+       toi_extent_state_goto_start(&toi_writer_posn);
+       toi_bio_ops.set_extra_page_forward();
+
+       return toi_load_extent_chain(&block_chain);
+}
+
+static int toi_file_read_header_cleanup(void)
+{
+       toi_bio_ops.rw_cleanup(READ);
+       return 0;
+}
+
+static int toi_file_signature_op(int op)
+{
+       char *cur;
+       int result = 0, changed = 0;
+       struct toi_file_header *header;
+
+       if (toi_file_target_bdev <= 0)
+               return -1;
+
+       cur = (char *) toi_get_zeroed_page(17, TOI_ATOMIC_GFP);
+       if (!cur) {
+               printk("Unable to allocate a page for reading the image "
+                               "signature.\n");
+               return -ENOMEM;
+       }
+
+       result = toi_bio_ops.bdev_page_io(READ, toi_file_target_bdev,
+                       target_firstblock,
+                       virt_to_page(cur));
+
+       if (result)
+               goto out;
+
+       header = (struct toi_file_header *) cur;
+       result = parse_signature(header);
+
+       switch (op) {
+       case INVALIDATE:
+               if (result == -1)
+                       goto out;
+
+               memcpy(header->sig, tuxonice_signature,
+                               sizeof(tuxonice_signature));
+               header->resumed_before = 0;
+               header->have_image = 0;
+               result = changed = 1;
+               break;
+       case MARK_RESUME_ATTEMPTED:
+               if (result == 1) {
+                       header->resumed_before = 1;
+                       changed = 1;
+               }
+               break;
+       case UNMARK_RESUME_ATTEMPTED:
+               if (result == 1) {
+                       header->resumed_before = 0;
+                       changed = 1;
+               }
+               break;
+       }
+
+       if (changed) {
+               int io_result = toi_bio_ops.bdev_page_io(WRITE,
+                               toi_file_target_bdev, target_firstblock,
+                               virt_to_page(cur));
+               if (io_result)
+                       result = io_result;
+       }
+
+out:
+       toi_bio_ops.finish_all_io();
+       toi_free_page(17, (unsigned long) cur);
+       return result;
+}
+
+/* Print debug info
+ *
+ * Description:
+ */
+
+static int toi_file_print_debug_stats(char *buffer, int size)
+{
+       int len = 0;
+
+       if (toiActiveAllocator != &toi_fileops) {
+               len = snprintf_used(buffer, size,
+                               "- FileAllocator inactive.\n");
+               return len;
+       }
+
+       len = snprintf_used(buffer, size, "- FileAllocator active.\n");
+
+       len += snprintf_used(buffer+len, size-len, "  Storage available for "
+                       "image: %ld pages.\n",
+                       toi_file_storage_allocated());
+
+       return len;
+}
+
+/*
+ * Storage needed
+ *
+ * Returns amount of space in the image header required
+ * for the toi_file's data.
+ *
+ * We ensure the space is allocated, but actually save the
+ * data from write_header_init and therefore don't also define a
+ * save_config_info routine.
+ */
+static int toi_file_storage_needed(void)
+{
+       return sig_size + strlen(toi_file_target) + 1 +
+               sizeof(toi_writer_posn_save) +
+               sizeof(devinfo) +
+               sizeof(struct hibernate_extent_chain) - 2 * sizeof(void *) +
+               (2 * sizeof(unsigned long) * block_chain.num_extents);
+}
+
+/*
+ * toi_file_remove_image
+ *
+ */
+static int toi_file_remove_image(void)
+{
+       toi_file_release_storage();
+       return toi_file_signature_op(INVALIDATE);
+}
+
+/*
+ * Image_exists
+ *
+ */
+
+static int toi_file_image_exists(int quiet)
+{
+       if (!toi_file_target_bdev)
+               reopen_resume_devt();
+
+       return toi_file_signature_op(GET_IMAGE_EXISTS);
+}
+
+/*
+ * Mark resume attempted.
+ *
+ * Record that we tried to resume from this image.
+ */
+
+static int toi_file_mark_resume_attempted(int mark)
+{
+       return toi_file_signature_op(mark ? MARK_RESUME_ATTEMPTED:
+               UNMARK_RESUME_ATTEMPTED);
+}
+
+static void toi_file_set_resume_param(void)
+{
+       char *buffer = (char *) toi_get_zeroed_page(18, TOI_ATOMIC_GFP);
+       char *buffer2 = (char *) toi_get_zeroed_page(19, TOI_ATOMIC_GFP);
+       unsigned long sector = bmap(target_inode, 0);
+       int offset = 0;
+
+       if (!buffer || !buffer2) {
+               if (buffer)
+                       toi_free_page(18, (unsigned long) buffer);
+               if (buffer2)
+                       toi_free_page(19, (unsigned long) buffer2);
+               printk("TuxOnIce: Failed to allocate memory while setting "
+                               "resume= parameter.\n");
+               return;
+       }
+
+       if (toi_file_target_bdev) {
+               set_devinfo(toi_file_target_bdev, target_inode->i_blkbits);
+
+               bdevname(toi_file_target_bdev, buffer2);
+               offset += snprintf(buffer + offset, PAGE_SIZE - offset,
+                               "/dev/%s", buffer2);
+
+               if (sector)
+                       offset += snprintf(buffer + offset, PAGE_SIZE - offset,
+                               ":0x%lx", sector << devinfo.bmap_shift);
+       } else
+               offset += snprintf(buffer + offset, PAGE_SIZE - offset,
+                               "%s is not a valid target.", toi_file_target);
+
+       sprintf(resume_file, "file:%s", buffer);
+
+       toi_free_page(18, (unsigned long) buffer);
+       toi_free_page(19, (unsigned long) buffer2);
+
+       toi_attempt_to_parse_resume_device(1);
+}
+
+static int __test_toi_file_target(char *target, int resume_time, int quiet)
+{
+       toi_file_get_target_info(target, 0, resume_time);
+       if (toi_file_signature_op(GET_IMAGE_EXISTS) > -1) {
+               if (!quiet)
+                       printk(KERN_INFO "TuxOnIce: FileAllocator: File "
+                                       "signature found.\n");
+               if (!resume_time)
+                       toi_file_set_resume_param();
+
+               toi_bio_ops.set_devinfo(&devinfo);
+               toi_writer_posn.chains = &block_chain;
+               toi_writer_posn.num_chains = 1;
+
+               if (!resume_time)
+                       set_toi_state(TOI_CAN_HIBERNATE);
+               return 0;
+       }
+
+       clear_toi_state(TOI_CAN_HIBERNATE);
+
+       if (quiet)
+               return 1;
+
+       if (*target)
+               printk(KERN_INFO "TuxOnIce: FileAllocator: Sorry. No signature "
+                               "found at  %s.\n", target);
+       else
+               if (!resume_time)
+                       printk(KERN_INFO "TuxOnIce: FileAllocator: Sorry. "
+                                       "Target is not set for hibernating.\n");
+
+       return 1;
+}
+
+static void test_toi_file_target(void)
+{
+       setting_toi_file_target = 1;
+
+       printk(KERN_INFO "TuxOnIce: Hibernating %sabled.\n",
+                       __test_toi_file_target(toi_file_target, 0, 1) ?
+                       "dis" : "en");
+
+       setting_toi_file_target = 0;
+}
+
+/*
+ * Parse Image Location
+ *
+ * Attempt to parse a resume= parameter.
+ * File Allocator accepts:
+ * resume=file:DEVNAME[:FIRSTBLOCK]
+ *
+ * Where:
+ * DEVNAME is convertable to a dev_t by name_to_dev_t
+ * FIRSTBLOCK is the location of the first block in the file.
+ * BLOCKSIZE is the logical blocksize >= SECTOR_SIZE & <= PAGE_SIZE,
+ * mod SECTOR_SIZE == 0 of the device.
+ * Data is validated by attempting to read a header from the
+ * location given. Failure will result in toi_file refusing to
+ * save an image, and a reboot with correct parameters will be
+ * necessary.
+ */
+
+static int toi_file_parse_sig_location(char *commandline,
+               int only_writer, int quiet)
+{
+       char *thischar, *devstart = NULL, *colon = NULL, *at_symbol = NULL;
+       int result = -EINVAL, target_blocksize = 0;
+
+       if (strncmp(commandline, "file:", 5)) {
+               if (!only_writer)
+                       return 1;
+       } else
+               commandline += 5;
+
+       /*
+        * Don't check signature again if we're beginning a cycle. If we already
+        * did the initialisation successfully, assume we'll be okay when it
+        * comes to resuming.
+        */
+       if (toi_file_target_bdev)
+               return 0;
+
+       devstart = thischar = commandline;
+       while ((*thischar != ':') && (*thischar != '@') &&
+               ((thischar - commandline) < 250) && (*thischar))
+               thischar++;
+
+       if (*thischar == ':') {
+               colon = thischar;
+               *colon = 0;
+               thischar++;
+       }
+
+       while ((*thischar != '@') && ((thischar - commandline) < 250)
+                       && (*thischar))
+               thischar++;
+
+       if (*thischar == '@') {
+               at_symbol = thischar;
+               *at_symbol = 0;
+       }
+
+       /*
+        * For the toi_file, you can be able to resume, but not hibernate,
+        * because the resume= is set correctly, but the toi_file_target
+        * isn't.
+        *
+        * We may have come here as a result of setting resume or
+        * toi_file_target. We only test the toi_file target in the
+        * former case (it's already done in the later), and we do it before
+        * setting the block number ourselves. It will overwrite the values
+        * given on the command line if we don't.
+        */
+
+       if (!setting_toi_file_target)
+               __test_toi_file_target(toi_file_target, 1, 0);
+
+       if (colon)
+               target_firstblock = (int) simple_strtoul(colon + 1, NULL, 0);
+       else
+               target_firstblock = 0;
+
+       if (at_symbol) {
+               target_blocksize = (int) simple_strtoul(at_symbol + 1, NULL, 0);
+               if (target_blocksize & (SECTOR_SIZE - 1)) {
+                       printk(KERN_INFO "FileAllocator: Blocksizes are "
+                                       "multiples of %d.\n", SECTOR_SIZE);
+                       result = -EINVAL;
+                       goto out;
+               }
+       }
+
+       if (!quiet)
+               printk(KERN_INFO "TuxOnIce FileAllocator: Testing whether you"
+                               " can resume:\n");
+
+       toi_file_get_target_info(commandline, 0, 1);
+
+       if (!toi_file_target_bdev || IS_ERR(toi_file_target_bdev)) {
+               toi_file_target_bdev = NULL;
+               result = -1;
+               goto out;
+       }
+
+       if (target_blocksize)
+               set_devinfo(toi_file_target_bdev, ffs(target_blocksize));
+
+       result = __test_toi_file_target(commandline, 1, 0);
+
+out:
+       if (result)
+               clear_toi_state(TOI_CAN_HIBERNATE);
+
+       if (!quiet)
+               printk(KERN_INFO "Resuming %sabled.\n",  result ? "dis" : "en");
+
+       if (colon)
+               *colon = ':';
+       if (at_symbol)
+               *at_symbol = '@';
+
+       return result;
+}
+
+/* toi_file_save_config_info
+ *
+ * Description:        Save the target's name, not for resume time, but for
+ *             all_settings.
+ * Arguments:  Buffer:         Pointer to a buffer of size PAGE_SIZE.
+ * Returns:    Number of bytes used for saving our data.
+ */
+
+static int toi_file_save_config_info(char *buffer)
+{
+       strcpy(buffer, toi_file_target);
+       return strlen(toi_file_target) + 1;
+}
+
+/* toi_file_load_config_info
+ *
+ * Description:        Reload target's name.
+ * Arguments:  Buffer:         Pointer to the start of the data.
+ *             Size:           Number of bytes that were saved.
+ */
+
+static void toi_file_load_config_info(char *buffer, int size)
+{
+       strcpy(toi_file_target, buffer);
+}
+
+static int toi_file_initialise(int starting_cycle)
+{
+       if (starting_cycle) {
+               if (toiActiveAllocator != &toi_fileops)
+                       return 0;
+
+               if (starting_cycle & SYSFS_HIBERNATE && !*toi_file_target) {
+                       printk(KERN_INFO "FileAllocator is the active writer,  "
+                                       "but no filename has been set.\n");
+                       return 1;
+               }
+       }
+
+       if (*toi_file_target)
+               toi_file_get_target_info(toi_file_target, starting_cycle, 0);
+
+       if (starting_cycle && (toi_file_image_exists(1) == -1)) {
+               printk("%s is does not have a valid signature for "
+                               "hibernating.\n", toi_file_target);
+               return 1;
+       }
+
+       return 0;
+}
+
+static struct toi_sysfs_data sysfs_params[] = {
+
+       {
+        TOI_ATTR("target", SYSFS_RW),
+        SYSFS_STRING(toi_file_target, 256, SYSFS_NEEDS_SM_FOR_WRITE),
+        .write_side_effect             = test_toi_file_target,
+       },
+
+       {
+         TOI_ATTR("enabled", SYSFS_RW),
+         SYSFS_INT(&toi_fileops.enabled, 0, 1, 0),
+         .write_side_effect            = attempt_to_parse_resume_device2,
+       }
+};
+
+static struct toi_module_ops toi_fileops = {
+       .type                                   = WRITER_MODULE,
+       .name                                   = "file storage",
+       .directory                              = "file",
+       .module                                 = THIS_MODULE,
+       .print_debug_info                       = toi_file_print_debug_stats,
+       .save_config_info                       = toi_file_save_config_info,
+       .load_config_info                       = toi_file_load_config_info,
+       .storage_needed                         = toi_file_storage_needed,
+       .initialise                             = toi_file_initialise,
+       .cleanup                                = toi_file_cleanup,
+
+       .noresume_reset         = toi_file_noresume_reset,
+       .storage_available      = toi_file_storage_available,
+       .storage_allocated      = toi_file_storage_allocated,
+       .release_storage        = toi_file_release_storage,
+       .reserve_header_space   = toi_file_reserve_header_space,
+       .allocate_storage       = toi_file_allocate_storage,
+       .image_exists           = toi_file_image_exists,
+       .mark_resume_attempted  = toi_file_mark_resume_attempted,
+       .write_header_init      = toi_file_write_header_init,
+       .write_header_cleanup   = toi_file_write_header_cleanup,
+       .read_header_init       = toi_file_read_header_init,
+       .read_header_cleanup    = toi_file_read_header_cleanup,
+       .remove_image           = toi_file_remove_image,
+       .parse_sig_location     = toi_file_parse_sig_location,
+
+       .sysfs_data             = sysfs_params,
+       .num_sysfs_entries      = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+/* ---- Registration ---- */
+static __init int toi_file_load(void)
+{
+       toi_fileops.rw_init = toi_bio_ops.rw_init;
+       toi_fileops.rw_cleanup = toi_bio_ops.rw_cleanup;
+       toi_fileops.read_page = toi_bio_ops.read_page;
+       toi_fileops.write_page = toi_bio_ops.write_page;
+       toi_fileops.rw_header_chunk = toi_bio_ops.rw_header_chunk;
+       toi_fileops.rw_header_chunk_noreadahead =
+               toi_bio_ops.rw_header_chunk_noreadahead;
+       toi_fileops.io_flusher = toi_bio_ops.io_flusher;
+
+       return toi_register_module(&toi_fileops);
+}
+
+#ifdef MODULE
+static __exit void toi_file_unload(void)
+{
+       toi_unregister_module(&toi_fileops);
+}
+
+module_init(toi_file_load);
+module_exit(toi_file_unload);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("TuxOnIce FileAllocator");
+#else
+late_initcall(toi_file_load);
+#endif
diff --git a/kernel/power/tuxonice_highlevel.c b/kernel/power/tuxonice_highlevel.c
new file mode 100644
index 0000000..f233f24
--- /dev/null
+++ b/kernel/power/tuxonice_highlevel.c
@@ -0,0 +1,1328 @@
+/*
+ * kernel/power/tuxonice_highlevel.c
+ */
+/** \mainpage TuxOnIce.
+ *
+ * TuxOnIce provides support for saving and restoring an image of
+ * system memory to an arbitrary storage device, either on the local computer,
+ * or across some network. The support is entirely OS based, so TuxOnIce
+ * works without requiring BIOS, APM or ACPI support. The vast majority of the
+ * code is also architecture independant, so it should be very easy to port
+ * the code to new architectures. TuxOnIce includes support for SMP, 4G HighMem
+ * and preemption. Initramfses and initrds are also supported.
+ *
+ * TuxOnIce uses a modular design, in which the method of storing the image is
+ * completely abstracted from the core code, as are transformations on the data
+ * such as compression and/or encryption (multiple 'modules' can be used to
+ * provide arbitrary combinations of functionality). The user interface is also
+ * modular, so that arbitrarily simple or complex interfaces can be used to
+ * provide anything from debugging information through to eye candy.
+ *
+ * \section Copyright
+ *
+ * TuxOnIce is released under the GPLv2.
+ *
+ * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu><BR>
+ * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz><BR>
+ * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr><BR>
+ * Copyright (C) 2002-2007 Nigel Cunningham (nigel at tuxonice net)<BR>
+ *
+ * \section Credits
+ *
+ * Nigel would like to thank the following people for their work:
+ *
+ * Bernard Blackham <bernard@blackham.com.au><BR>
+ * Web page & Wiki administration, some coding. A person without whom
+ * TuxOnIce would not be where it is.
+ *
+ * Michael Frank <mhf@linuxmail.org><BR>
+ * Extensive testing and help with improving stability. I was constantly
+ * amazed by the quality and quantity of Michael's help.
+ *
+ * Pavel Machek <pavel@ucw.cz><BR>
+ * Modifications, defectiveness pointing, being with Gabor at the very
+ * beginning, suspend to swap space, stop all tasks. Port to 2.4.18-ac and
+ * 2.5.17. Even though Pavel and I disagree on the direction suspend to
+ * disk should take, I appreciate the valuable work he did in helping Gabor
+ * get the concept working.
+ *
+ * ..and of course the myriads of TuxOnIce users who have helped diagnose
+ * and fix bugs, made suggestions on how to improve the code, proofread
+ * documentation, and donated time and money.
+ *
+ * Thanks also to corporate sponsors:
+ *
+ * <B>Redhat.</B>Sometime employer from May 2006 (my fault, not Redhat's!).
+ *
+ * <B>Cyclades.com.</B> Nigel's employers from Dec 2004 until May 2006, who
+ * allowed him to work on TuxOnIce and PM related issues on company time.
+ *
+ * <B>LinuxFund.org.</B> Sponsored Nigel's work on TuxOnIce for four months Oct
+ * 2003 to Jan 2004.
+ *
+ * <B>LAC Linux.</B> Donated P4 hardware that enabled development and ongoing
+ * maintenance of SMP and Highmem support.
+ *
+ * <B>OSDL.</B> Provided access to various hardware configurations, make
+ * occasional small donations to the project.
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/freezer.h>
+#include <linux/utsrelease.h>
+#include <linux/cpu.h>
+#include <linux/console.h>
+#include <linux/writeback.h>
+#include <asm/uaccess.h>
+
+#include "tuxonice_modules.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_prepare_image.h"
+#include "tuxonice_io.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_power_off.h"
+#include "tuxonice_storage.h"
+#include "tuxonice_checksum.h"
+#include "tuxonice_cluster.h"
+#include "tuxonice_builtin.h"
+#include "tuxonice_atomic_copy.h"
+#include "tuxonice_alloc.h"
+
+/*! Pageset metadata. */
+struct pagedir pagedir2 = {2};
+
+static int get_pmsem = 0, got_pmsem;
+static mm_segment_t oldfs;
+static DEFINE_MUTEX(tuxonice_in_use);
+static int block_dump_save;
+static char pre_hibernate_command[256];
+static char post_hibernate_command[256];
+
+char *tuxonice_signature = "\xed\xc3\x02\xe9\x98\x56\xe5\x0c";
+
+int toi_fail_num;
+
+int do_toi_step(int step);
+
+unsigned long boot_kernel_data_buffer;
+
+/**
+ * toi_finish_anything - Cleanup after doing anything.
+ *
+ * @toi_or_resume: Whether finishing a cycle or attempt at resuming.
+ *
+ * This is our basic clean-up routine, matching start_anything below. We
+ * call cleanup routines, drop module references and restore process fs and
+ * cpus allowed masks, together with the global block_dump variable's value.
+ */
+void toi_finish_anything(int hibernate_or_resume)
+{
+       toi_cleanup_modules(hibernate_or_resume);
+       toi_put_modules();
+       if (hibernate_or_resume) {
+               block_dump = block_dump_save;
+               set_cpus_allowed(current, CPU_MASK_ALL);
+               toi_alloc_print_debug_stats();
+
+               if (hibernate_or_resume == SYSFS_HIBERNATE &&
+                               strlen(post_hibernate_command))
+                       toi_launch_userspace_program(post_hibernate_command,
+                                       0, UMH_WAIT_PROC);
+       }
+
+       set_fs(oldfs);
+       mutex_unlock(&tuxonice_in_use);
+}
+
+/**
+ * toi_start_anything - Basic initialisation for TuxOnIce.
+ *
+ * @toi_or_resume: Whether starting a cycle or attempt at resuming.
+ *
+ * Our basic initialisation routine. Take references on modules, use the
+ * kernel segment, recheck resume= if no active allocator is set, initialise
+ * modules, save and reset block_dump and ensure we're running on CPU0.
+ */
+int toi_start_anything(int hibernate_or_resume)
+{
+       mutex_lock(&tuxonice_in_use);
+
+       oldfs = get_fs();
+       set_fs(KERNEL_DS);
+
+       if (hibernate_or_resume == SYSFS_HIBERNATE &&
+                       strlen(pre_hibernate_command)) {
+               int result = toi_launch_userspace_program(pre_hibernate_command,
+                               0, UMH_WAIT_PROC);
+               if (result) {
+                       printk(KERN_INFO "Pre-hibernate command '%s' returned "
+                                       "%d. Aborting.\n",
+                                       pre_hibernate_command, result);
+                       goto prehibernate_err;
+               }
+       }
+
+       if (hibernate_or_resume == SYSFS_HIBERNATE)
+               toi_print_modules();
+
+       if (toi_get_modules()) {
+               printk("TuxOnIce: Get modules failed!\n");
+               goto getmodules_err;
+       }
+
+       if (hibernate_or_resume) {
+               block_dump_save = block_dump;
+               block_dump = 0;
+               set_cpus_allowed(current,
+                               cpumask_of_cpu(first_cpu(cpu_online_map)));
+       }
+
+       if (toi_initialise_modules_early(hibernate_or_resume))
+               goto early_init_err;
+
+       if (!toiActiveAllocator)
+               toi_attempt_to_parse_resume_device(!hibernate_or_resume);
+
+       if (toi_initialise_modules_late(hibernate_or_resume))
+               goto late_init_err;
+
+       return 0;
+
+late_init_err:
+       toi_cleanup_modules(hibernate_or_resume);
+early_init_err:
+       if (hibernate_or_resume) {
+               block_dump_save = block_dump;
+               set_cpus_allowed(current, CPU_MASK_ALL);
+       }
+getmodules_err:
+prehibernate_err:
+       set_fs(oldfs);
+       mutex_unlock(&tuxonice_in_use);
+       return -EBUSY;
+}
+
+/*
+ * Nosave page tracking.
+ *
+ * Here rather than in prepare_image because we want to do it once only at the
+ * start of a cycle.
+ */
+
+/**
+ * mark_nosave_pages - Set up our Nosave bitmap.
+ *
+ * Build a bitmap of Nosave pages from the list. The bitmap allows faster
+ * use when preparing the image.
+ */
+static void mark_nosave_pages(void)
+{
+       struct nosave_region *region;
+
+       list_for_each_entry(region, &nosave_regions, list) {
+               unsigned long pfn;
+
+               for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++)
+                       SetPageNosave(pfn_to_page(pfn));
+       }
+}
+
+/**
+ * allocate_bitmaps: Allocate bitmaps used to record page states.
+ *
+ * Allocate the bitmaps we use to record the various TuxOnIce related
+ * page states.
+ */
+static int allocate_bitmaps(void)
+{
+       if (allocate_dyn_pageflags(&pageset1_map, 0) ||
+           allocate_dyn_pageflags(&pageset1_copy_map, 0) ||
+           allocate_dyn_pageflags(&pageset2_map, 0) ||
+           allocate_dyn_pageflags(&io_map, 0) ||
+           allocate_dyn_pageflags(&nosave_map, 0) ||
+           allocate_dyn_pageflags(&free_map, 0) ||
+           allocate_dyn_pageflags(&page_resave_map, 0))
+               return 1;
+
+       return 0;
+}
+
+/**
+ * free_bitmaps: Free the bitmaps used to record page states.
+ *
+ * Free the bitmaps allocated above. It is not an error to call
+ * free_dyn_pageflags on a bitmap that isn't currentyl allocated.
+ */
+static void free_bitmaps(void)
+{
+       free_dyn_pageflags(&pageset1_map);
+       free_dyn_pageflags(&pageset1_copy_map);
+       free_dyn_pageflags(&pageset2_map);
+       free_dyn_pageflags(&io_map);
+       free_dyn_pageflags(&nosave_map);
+       free_dyn_pageflags(&free_map);
+       free_dyn_pageflags(&page_resave_map);
+}
+
+/**
+ * io_MB_per_second: Return the number of MB/s read or written.
+ *
+ * @write: Whether to return the speed at which we wrote.
+ *
+ * Calculate the number of megabytes per second that were read or written.
+ */
+static int io_MB_per_second(int write)
+{
+       return (toi_bkd.toi_io_time[write][1]) ?
+               MB((unsigned long) toi_bkd.toi_io_time[write][0]) * HZ /
+               toi_bkd.toi_io_time[write][1] : 0;
+}
+
+/**
+ * get_debug_info: Fill a buffer with debugging information.
+ *
+ * @buffer: The buffer to be filled.
+ * @count: The size of the buffer, in bytes.
+ *
+ * Fill a (usually PAGE_SIZEd) buffer with the debugging info that we will
+ * either printk or return via sysfs.
+ */
+#define SNPRINTF(a...)         do { len += snprintf_used(((char *) buffer) + len, \
+               count - len - 1, ## a); } while (0)
+
+static int get_toi_debug_info(const char *buffer, int count)
+{
+       int len = 0;
+
+       SNPRINTF("TuxOnIce debugging info:\n");
+       SNPRINTF("- TuxOnIce core  : " TOI_CORE_VERSION "\n");
+       SNPRINTF("- Kernel Version : " UTS_RELEASE "\n");
+       SNPRINTF("- Compiler vers. : %d.%d\n", __GNUC__, __GNUC_MINOR__);
+       SNPRINTF("- Attempt number : %d\n", nr_hibernates);
+       SNPRINTF("- Parameters     : %ld %ld %ld %d %d %ld\n",
+                       toi_result,
+                       toi_bkd.toi_action,
+                       toi_bkd.toi_debug_state,
+                       toi_bkd.toi_default_console_level,
+                       image_size_limit,
+                       toi_poweroff_method);
+       SNPRINTF("- Overall expected compression percentage: %d.\n",
+                       100 - toi_expected_compression_ratio());
+       len += toi_print_module_debug_info(((char *) buffer) + len,
+                       count - len - 1);
+       if (toi_bkd.toi_io_time[0][1]) {
+               if ((io_MB_per_second(0) < 5) || (io_MB_per_second(1) < 5)) {
+                       SNPRINTF("- I/O speed: Write %d KB/s",
+                         (KB((unsigned long) toi_bkd.toi_io_time[0][0]) * HZ /
+                         toi_bkd.toi_io_time[0][1]));
+                       if (toi_bkd.toi_io_time[1][1])
+                               SNPRINTF(", Read %d KB/s",
+                                 (KB((unsigned long)
+                                     toi_bkd.toi_io_time[1][0]) * HZ /
+                                 toi_bkd.toi_io_time[1][1]));
+               } else {
+                       SNPRINTF("- I/O speed: Write %d MB/s",
+                        (MB((unsigned long) toi_bkd.toi_io_time[0][0]) * HZ /
+                         toi_bkd.toi_io_time[0][1]));
+                       if (toi_bkd.toi_io_time[1][1])
+                               SNPRINTF(", Read %d MB/s",
+                                (MB((unsigned long)
+                                    toi_bkd.toi_io_time[1][0]) * HZ /
+                                 toi_bkd.toi_io_time[1][1]));
+               }
+               SNPRINTF(".\n");
+       } else
+               SNPRINTF("- No I/O speed stats available.\n");
+       SNPRINTF("- Extra pages    : %ld used/%ld.\n",
+                       extra_pd1_pages_used, extra_pd1_pages_allowance);
+
+       return len;
+}
+
+/**
+ * do_cleanup: Cleanup after attempting to hibernate or resume.
+ *
+ * @get_debug_info: Whether to allocate and return debugging info.
+ *
+ * Cleanup after attempting to hibernate or resume, possibly getting
+ * debugging info as we do so.
+ */
+static void do_cleanup(int get_debug_info)
+{
+       int i = 0;
+       char *buffer = NULL;
+
+       if (get_debug_info)
+               toi_prepare_status(DONT_CLEAR_BAR, "Cleaning up...");
+       relink_lru_lists();
+
+       free_checksum_pages();
+
+       if (get_debug_info)
+               buffer = (char *) toi_get_zeroed_page(20, TOI_ATOMIC_GFP);
+
+       if (buffer)
+               i = get_toi_debug_info(buffer, PAGE_SIZE);
+
+       toi_free_extra_pagedir_memory();
+
+       pagedir1.size = pagedir2.size = 0;
+       set_highmem_size(pagedir1, 0);
+       set_highmem_size(pagedir2, 0);
+
+       if (boot_kernel_data_buffer) {
+               toi_free_page(37, boot_kernel_data_buffer);
+               boot_kernel_data_buffer = 0;
+       }
+
+       if (test_toi_state(TOI_NOTIFIERS_PREPARE)) {
+               pm_notifier_call_chain(PM_POST_HIBERNATION);
+               clear_toi_state(TOI_NOTIFIERS_PREPARE);
+       }
+
+       thaw_processes();
+
+#ifdef CONFIG_TOI_KEEP_IMAGE
+       if (test_action_state(TOI_KEEP_IMAGE) &&
+           !test_result_state(TOI_ABORTED)) {
+               toi_message(TOI_ANY_SECTION, TOI_LOW, 1,
+                       "TuxOnIce: Not invalidating the image due "
+                       "to Keep Image being enabled.\n");
+               set_result_state(TOI_KEPT_IMAGE);
+       } else
+#endif
+               if (toiActiveAllocator)
+                       toiActiveAllocator->remove_image();
+
+       free_bitmaps();
+
+       if (buffer && i) {
+               /* Printk can only handle 1023 bytes, including
+                * its level mangling. */
+               for (i = 0; i < 3; i++)
+                       printk("%s", buffer + (1023 * i));
+               toi_free_page(20, (unsigned long) buffer);
+       }
+
+       if (!test_action_state(TOI_LATE_CPU_HOTPLUG))
+               enable_nonboot_cpus();
+       toi_cleanup_console();
+
+       free_attention_list();
+
+       toi_deactivate_storage(0);
+
+       clear_toi_state(TOI_IGNORE_LOGLEVEL);
+       clear_toi_state(TOI_TRYING_TO_RESUME);
+       clear_toi_state(TOI_NOW_RESUMING);
+
+       if (got_pmsem) {
+               mutex_unlock(&pm_mutex);
+               got_pmsem = 0;
+       }
+}
+
+/**
+ * check_still_keeping_image: We kept an image; check whether to reuse it.
+ *
+ * We enter this routine when we have kept an image. If the user has said they
+ * want to still keep it, all we need to do is powerdown. If powering down
+ * means hibernating to ram and the power doesn't run out, we'll return 1.
+ * If we do power off properly or the battery runs out, we'll resume via the
+ * normal paths.
+ *
+ * If the user has said they want to remove the previously kept image, we
+ * remove it, and return 0. We'll then store a new image.
+ */
+static int check_still_keeping_image(void)
+{
+       if (test_action_state(TOI_KEEP_IMAGE)) {
+               printk("Image already stored: powering down immediately.");
+               do_toi_step(STEP_HIBERNATE_POWERDOWN);
+               return 1;       /* Just in case we're using S3 */
+       }
+
+       printk("Invalidating previous image.\n");
+       toiActiveAllocator->remove_image();
+
+       return 0;
+}
+
+/**
+ * toi_init: Prepare to hibernate to disk.
+ *
+ * Initialise variables & data structures, in preparation for
+ * hibernating to disk.
+ */
+static int toi_init(void)
+{
+       int result, i, j;
+
+       toi_result = 0;
+
+       printk(KERN_INFO "Initiating a hibernation cycle.\n");
+
+       nr_hibernates++;
+
+       for (i = 0; i < 2; i++)
+               for (j = 0; j < 2; j++)
+                       toi_bkd.toi_io_time[i][j] = 0;
+
+       if (!test_toi_state(TOI_CAN_HIBERNATE) ||
+           allocate_bitmaps())
+               return 1;
+
+       mark_nosave_pages();
+
+       toi_prepare_console();
+
+       result = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
+       if (result) {
+               set_result_state(TOI_NOTIFIERS_PREPARE_FAILED);
+               return 1;
+       }
+       set_toi_state(TOI_NOTIFIERS_PREPARE);
+
+       boot_kernel_data_buffer = toi_get_zeroed_page(37, TOI_ATOMIC_GFP);
+       if (!boot_kernel_data_buffer) {
+               printk(KERN_ERR "TuxOnIce: Failed to allocate "
+                               "boot_kernel_data_buffer.\n");
+               set_result_state(TOI_OUT_OF_MEMORY);
+               return 1;
+       }
+
+       if (test_action_state(TOI_LATE_CPU_HOTPLUG) ||
+                       !disable_nonboot_cpus())
+               return 1;
+
+       set_abort_result(TOI_CPU_HOTPLUG_FAILED);
+       return 0;
+}
+
+/**
+ * can_hibernate: Perform basic 'Can we hibernate?' tests.
+ *
+ * Perform basic tests that must pass if we're going to be able to hibernate:
+ * Can we get the pm_mutex? Is resume= valid (we need to know where to write
+ * the image header).
+ */
+static int can_hibernate(void)
+{
+       if (get_pmsem) {
+               if (!mutex_trylock(&pm_mutex)) {
+                       printk(KERN_INFO "TuxOnIce: Failed to obtain "
+                                       "pm_mutex.\n");
+                       dump_stack();
+                       set_abort_result(TOI_PM_SEM);
+                       return 0;
+               }
+               got_pmsem = 1;
+       }
+
+       if (!test_toi_state(TOI_CAN_HIBERNATE))
+               toi_attempt_to_parse_resume_device(0);
+
+       if (!test_toi_state(TOI_CAN_HIBERNATE)) {
+               printk(KERN_INFO "TuxOnIce: Hibernation is disabled.\n"
+                       "This may be because you haven't put something along "
+                       "the lines of\n\nresume=swap:/dev/hda1\n\n"
+                       "in lilo.conf or equivalent. (Where /dev/hda1 is your "
+                       "swap partition).\n");
+               set_abort_result(TOI_CANT_SUSPEND);
+               if (!got_pmsem) {
+                       mutex_unlock(&pm_mutex);
+                       got_pmsem = 0;
+               }
+               return 0;
+       }
+
+       return 1;
+}
+
+/**
+ * do_post_image_write: Having written an image, figure out what to do next.
+ *
+ * After writing an image, we might load an alternate image or power down.
+ * Powering down might involve hibernating to ram, in which case we also
+ * need to handle reloading pageset2.
+ */
+static int do_post_image_write(void)
+{
+       /* If switching images fails, do normal powerdown */
+       if (alt_resume_param[0])
+               do_toi_step(STEP_RESUME_ALT_IMAGE);
+
+       toi_power_down();
+
+       /* If we return, it's because we hibernated to ram */
+       if (read_pageset2(1))
+               panic("Attempt to reload pagedir 2 failed. Try rebooting.");
+
+       barrier();
+       mb();
+       do_cleanup(1);
+       return 0;
+}
+
+/**
+ * __save_image: Do the hard work of saving the image.
+ *
+ * High level routine for getting the image saved. The key assumptions made
+ * are that processes have been frozen and sufficient memory is available.
+ *
+ * We also exit through here at resume time, coming back from toi_hibernate
+ * after the atomic restore. This is the reason for the toi_in_hibernate
+ * test.
+ */
+static int __save_image(void)
+{
+       int temp_result, did_copy = 0;
+
+       toi_prepare_status(DONT_CLEAR_BAR, "Starting to save the image..");
+
+       toi_message(TOI_ANY_SECTION, TOI_LOW, 1,
+               " - Final values: %d and %d.\n",
+               pagedir1.size, pagedir2.size);
+
+       toi_cond_pause(1, "About to write pagedir2.");
+
+       temp_result = write_pageset(&pagedir2);
+
+       if (temp_result == -1 || test_result_state(TOI_ABORTED))
+               return 1;
+
+       toi_cond_pause(1, "About to copy pageset 1.");
+
+       if (test_result_state(TOI_ABORTED))
+               return 1;
+
+       toi_deactivate_storage(1);
+
+       toi_prepare_status(DONT_CLEAR_BAR, "Doing atomic copy.");
+
+       toi_in_hibernate = 1;
+
+       if (toi_go_atomic(PMSG_FREEZE, 1))
+               goto Failed;
+
+       temp_result = toi_hibernate();
+       if (!temp_result)
+               did_copy = 1;
+
+       /* We return here at resume time too! */
+       toi_end_atomic(ATOMIC_ALL_STEPS, toi_in_hibernate, temp_result);
+
+Failed:
+       if (toi_activate_storage(1))
+               panic("Failed to reactivate our storage.");
+
+       /* Resume time? */
+       if (!toi_in_hibernate) {
+               copyback_post();
+               return 0;
+       }
+
+       /* Nope. Hibernating. So, see if we can save the image... */
+
+       if (temp_result || test_result_state(TOI_ABORTED)) {
+               if (did_copy)
+                       goto abort_reloading_pagedir_two;
+               else
+                       return 1;
+       }
+
+       toi_update_status(pagedir2.size, pagedir1.size + pagedir2.size,
+                       NULL);
+
+       if (test_result_state(TOI_ABORTED))
+               goto abort_reloading_pagedir_two;
+
+       toi_cond_pause(1, "About to write pageset1.");
+
+       toi_message(TOI_ANY_SECTION, TOI_LOW, 1, "-- Writing pageset1\n");
+
+       temp_result = write_pageset(&pagedir1);
+
+       /* We didn't overwrite any memory, so no reread needs to be done. */
+       if (test_action_state(TOI_TEST_FILTER_SPEED))
+               return 1;
+
+       if (temp_result == 1 || test_result_state(TOI_ABORTED))
+               goto abort_reloading_pagedir_two;
+
+       toi_cond_pause(1, "About to write header.");
+
+       if (test_result_state(TOI_ABORTED))
+               goto abort_reloading_pagedir_two;
+
+       temp_result = write_image_header();
+
+       if (test_action_state(TOI_TEST_BIO))
+               return 1;
+
+       if (!temp_result && !test_result_state(TOI_ABORTED))
+               return 0;
+
+abort_reloading_pagedir_two:
+       temp_result = read_pageset2(1);
+
+       /* If that failed, we're sunk. Panic! */
+       if (temp_result)
+               panic("Attempt to reload pagedir 2 while aborting "
+                               "a hibernate failed.");
+
+       return 1;
+}
+
+/**
+ * do_save_image: Save the image and handle the result.
+ *
+ * Save the prepared image. If we fail or we're in the path returning
+ * from the atomic restore, cleanup.
+ */
+
+static int do_save_image(void)
+{
+       int result = __save_image();
+       if (!toi_in_hibernate || result)
+               do_cleanup(1);
+       return result;
+}
+
+
+/**
+ * do_prepare_image: Try to prepare an image.
+ *
+ * Seek to initialise and prepare an image to be saved. On failure,
+ * cleanup.
+ */
+
+static int do_prepare_image(void)
+{
+       if (toi_activate_storage(0))
+               return 1;
+
+       /*
+        * If kept image and still keeping image and hibernating to RAM, we will
+        * return 1 after hibernating and resuming (provided the power doesn't
+        * run out. In that case, we skip directly to cleaning up and exiting.
+        */
+
+       if (!can_hibernate() ||
+           (test_result_state(TOI_KEPT_IMAGE) &&
+            check_still_keeping_image()))
+               goto cleanup;
+
+       if (toi_init() && !toi_prepare_image() &&
+                       !test_result_state(TOI_ABORTED))
+               return 0;
+
+cleanup:
+       do_cleanup(0);
+       return 1;
+}
+
+/**
+ * do_check_can_resume: Find out whether an image has been stored.
+ *
+ * Read whether an image exists. We use the same routine as the
+ * image_exists sysfs entry, and just look to see whether the
+ * first character in the resulting buffer is a '1'.
+ */
+int do_check_can_resume(void)
+{
+       char *buf = (char *) toi_get_zeroed_page(21, TOI_ATOMIC_GFP);
+       int result = 0;
+
+       if (!buf)
+               return 0;
+
+       /* Only interested in first byte, so throw away return code. */
+       image_exists_read(buf, PAGE_SIZE);
+
+       if (buf[0] == '1')
+               result = 1;
+
+       toi_free_page(21, (unsigned long) buf);
+       return result;
+}
+
+/**
+ * do_load_atomic_copy: Load the first part of an image, if it exists.
+ *
+ * Check whether we have an image. If one exists, do sanity checking
+ * (possibly invalidating the image or even rebooting if the user
+ * requests that) before loading it into memory in preparation for the
+ * atomic restore.
+ *
+ * If and only if we have an image loaded and ready to restore, we return 1.
+ */
+static int do_load_atomic_copy(void)
+{
+       int read_image_result = 0;
+
+       if (sizeof(swp_entry_t) != sizeof(long)) {
+               printk(KERN_WARNING "TuxOnIce: The size of swp_entry_t != size"
+                       " of long. Please report this!\n");
+               return 1;
+       }
+
+       if (!resume_file[0])
+               printk(KERN_WARNING "TuxOnIce: "
+                       "You need to use a resume= command line parameter to "
+                       "tell TuxOnIce where to look for an image.\n");
+
+       toi_activate_storage(0);
+
+       if (!(test_toi_state(TOI_RESUME_DEVICE_OK)) &&
+               !toi_attempt_to_parse_resume_device(0)) {
+               /*
+                * Without a usable storage device we can do nothing -
+                * even if noresume is given
+                */
+
+               if (!toiNumAllocators)
+                       printk(KERN_ALERT "TuxOnIce: "
+                         "No storage allocators have been registered.\n");
+               else
+                       printk(KERN_ALERT "TuxOnIce: "
+                               "Missing or invalid storage location "
+                               "(resume= parameter). Please correct and "
+                               "rerun lilo (or equivalent) before "
+                               "hibernating.\n");
+               toi_deactivate_storage(0);
+               return 1;
+       }
+
+       read_image_result = read_pageset1(); /* non fatal error ignored */
+
+       if (test_toi_state(TOI_NORESUME_SPECIFIED))
+               clear_toi_state(TOI_NORESUME_SPECIFIED);
+
+       toi_deactivate_storage(0);
+
+       if (read_image_result)
+               return 1;
+
+       return 0;
+}
+
+/**
+ * prepare_restore_load_alt_image: Save & restore alt image variables.
+ *
+ * Save and restore the pageset1 maps, when loading an alternate image.
+ */
+static void prepare_restore_load_alt_image(int prepare)
+{
+       static struct dyn_pageflags pageset1_map_save, pageset1_copy_map_save;
+
+       if (prepare) {
+               memcpy(&pageset1_map_save, &pageset1_map,
+                               sizeof(struct dyn_pageflags));
+               pageset1_map.bitmap = NULL;
+               pageset1_map.sparse = 0;
+               pageset1_map.initialised = 0;
+               memcpy(&pageset1_copy_map_save, &pageset1_copy_map,
+                       sizeof(struct dyn_pageflags));
+               pageset1_copy_map.bitmap = NULL;
+               pageset1_copy_map.sparse = 0;
+               pageset1_copy_map.initialised = 0;
+               set_toi_state(TOI_LOADING_ALT_IMAGE);
+               toi_reset_alt_image_pageset2_pfn();
+       } else {
+               if (pageset1_map.bitmap)
+                       free_dyn_pageflags(&pageset1_map);
+               memcpy(&pageset1_map, &pageset1_map_save,
+                       sizeof(struct dyn_pageflags));
+               if (pageset1_copy_map.bitmap)
+                       free_dyn_pageflags(&pageset1_copy_map);
+               memcpy(&pageset1_copy_map, &pageset1_copy_map_save,
+                       sizeof(struct dyn_pageflags));
+               clear_toi_state(TOI_NOW_RESUMING);
+               clear_toi_state(TOI_LOADING_ALT_IMAGE);
+       }
+}
+
+/**
+ * pre_resume_freeze: Freeze the system, before doing an atomic restore.
+ *
+ * Hot unplug cpus (if we didn't do it early) and freeze processes, in
+ * preparation for doing an atomic restore.
+ */
+int pre_resume_freeze(void)
+{
+       if (!test_action_state(TOI_LATE_CPU_HOTPLUG)) {
+               toi_prepare_status(DONT_CLEAR_BAR, "Disable nonboot cpus.");
+               if (disable_nonboot_cpus()) {
+                       set_abort_result(TOI_CPU_HOTPLUG_FAILED);
+                       return 1;
+               }
+       }
+
+       toi_prepare_status(DONT_CLEAR_BAR,      "Freeze processes.");
+
+       if (freeze_processes()) {
+               printk("Some processes failed to stop.\n");
+               return 1;
+       }
+
+       return 0;
+}
+
+/**
+ * do_toi_step: Perform a step in hibernating or resuming.
+ *
+ * Perform a step in hibernating or resuming an image. This abstraction
+ * is in preparation for implementing cluster support, and perhaps replacing
+ * uswsusp too (haven't looked whether that's possible yet).
+ */
+int do_toi_step(int step)
+{
+       switch (step) {
+       case STEP_HIBERNATE_PREPARE_IMAGE:
+               return do_prepare_image();
+       case STEP_HIBERNATE_SAVE_IMAGE:
+               return do_save_image();
+       case STEP_HIBERNATE_POWERDOWN:
+               return do_post_image_write();
+       case STEP_RESUME_CAN_RESUME:
+               return do_check_can_resume();
+       case STEP_RESUME_LOAD_PS1:
+               return do_load_atomic_copy();
+       case STEP_RESUME_DO_RESTORE:
+               /*
+                * If we succeed, this doesn't return.
+                * Instead, we return from do_save_image() in the
+                * hibernated kernel.
+                */
+               return toi_atomic_restore();
+       case STEP_RESUME_ALT_IMAGE:
+               printk(KERN_INFO "Trying to resume alternate image.\n");
+               toi_in_hibernate = 0;
+               save_restore_alt_param(SAVE, NOQUIET);
+               prepare_restore_load_alt_image(1);
+               if (!do_check_can_resume()) {
+                       printk(KERN_INFO "Nothing to resume from.\n");
+                       goto out;
+               }
+               if (!do_load_atomic_copy())
+                       toi_atomic_restore();
+
+               printk(KERN_INFO "Failed to load image.\n");
+out:
+               prepare_restore_load_alt_image(0);
+               save_restore_alt_param(RESTORE, NOQUIET);
+               break;
+       case STEP_CLEANUP:
+               do_cleanup(1);
+               break;
+       case STEP_QUIET_CLEANUP:
+               do_cleanup(0);
+               break;
+       }
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(do_toi_step);
+
+/* -- Functions for kickstarting a hibernate or resume --- */
+
+/**
+ * __toi_try_resume: Try to do the steps in resuming.
+ *
+ * Check if we have an image and if so try to resume. Clear the status
+ * flags too.
+ */
+void __toi_try_resume(void)
+{
+       set_toi_state(TOI_TRYING_TO_RESUME);
+       resume_attempted = 1;
+
+       current->flags |= PF_MEMALLOC;
+
+       if (do_toi_step(STEP_RESUME_CAN_RESUME) &&
+           !do_toi_step(STEP_RESUME_LOAD_PS1))
+           do_toi_step(STEP_RESUME_DO_RESTORE);
+
+       do_cleanup(0);
+
+       current->flags &= ~PF_MEMALLOC;
+
+       clear_toi_state(TOI_IGNORE_LOGLEVEL);
+       clear_toi_state(TOI_TRYING_TO_RESUME);
+       clear_toi_state(TOI_NOW_RESUMING);
+}
+
+/**
+ * _toi_try_resume: Wrapper calling __toi_try_resume from do_mounts.
+ *
+ * Wrapper for when __toi_try_resume is called from init/do_mounts.c,
+ * rather than from echo > /sys/power/tuxonice/do_resume.
+ */
+void _toi_try_resume(void)
+{
+       resume_attempted = 1;
+
+       /*
+        * There's a comment in kernel/power/disk.c that indicates
+        * we should be able to use mutex_lock_nested below. That
+        * doesn't seem to cut it, though, so let's just turn lockdep
+        * off for now.
+        */
+       lockdep_off();
+
+       if (toi_start_anything(SYSFS_RESUMING))
+               goto out;
+
+       /* Unlock will be done in do_cleanup */
+       mutex_lock(&pm_mutex);
+       got_pmsem = 1;
+
+       __toi_try_resume();
+
+       /*
+        * For initramfs, we have to clear the boot time
+        * flag after trying to resume
+        */
+       clear_toi_state(TOI_BOOT_TIME);
+
+out:
+       toi_finish_anything(SYSFS_RESUMING);
+       lockdep_on();
+
+}
+
+/**
+ * _toi_try_hibernate: Try to start a hibernation cycle.
+ *
+ * have_pmsem: Whther the pm_sem is already taken.
+ *
+ * Start a hibernation cycle, coming in from either
+ * echo > /sys/power/tuxonice/do_suspend
+ *
+ * or
+ *
+ * echo disk > /sys/power/state
+ *
+ * In the later case, we come in without pm_sem taken; in the
+ * former, it has been taken.
+ */
+int _toi_try_hibernate(int have_pmsem)
+{
+       int result = 0, sys_power_disk = 0;
+
+       if (!mutex_is_locked(&tuxonice_in_use)) {
+               /* Came in via /sys/power/disk */
+               if (toi_start_anything(SYSFS_HIBERNATING))
+                       return -EBUSY;
+               sys_power_disk = 1;
+       }
+
+       get_pmsem = !have_pmsem;
+
+       if (strlen(alt_resume_param)) {
+               attempt_to_parse_alt_resume_param();
+
+               if (!strlen(alt_resume_param)) {
+                       printk(KERN_INFO "Alternate resume parameter now "
+                                       "invalid. Aborting.\n");
+                       goto out;
+               }
+       }
+
+       current->flags |= PF_MEMALLOC;
+
+       if (test_toi_state(TOI_CLUSTER_MODE)) {
+               toi_initiate_cluster_hibernate();
+               goto out;
+       }
+
+       result = do_toi_step(STEP_HIBERNATE_PREPARE_IMAGE);
+       if (result)
+               goto out;
+
+       if (test_action_state(TOI_FREEZER_TEST)) {
+               do_cleanup(0);
+               goto out;
+       }
+
+       result = do_toi_step(STEP_HIBERNATE_SAVE_IMAGE);
+       if (result)
+               goto out;
+
+       /* This code runs at resume time too! */
+       if (toi_in_hibernate)
+               result = do_toi_step(STEP_HIBERNATE_POWERDOWN);
+out:
+       current->flags &= ~PF_MEMALLOC;
+
+       if (sys_power_disk)
+               toi_finish_anything(SYSFS_HIBERNATING);
+
+       return result;
+}
+
+/*
+ * channel_no: If !0, -c <channel_no> is added to args (userui).
+ */
+int toi_launch_userspace_program(char *command, int channel_no,
+               enum umh_wait wait)
+{
+       int retval;
+       static char *envp[] = {
+                       "HOME=/",
+                       "TERM=linux",
+                       "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
+                       NULL };
+       static char *argv[] =
+               { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
+       char *channel = NULL;
+       int arg = 0, size;
+       char test_read[255];
+       char *orig_posn = command;
+
+       if (!strlen(orig_posn))
+               return 1;
+
+       if (channel_no) {
+               channel = toi_kzalloc(4, 6, GFP_KERNEL);
+               if (!channel) {
+                       printk(KERN_INFO "Failed to allocate memory in "
+                               "preparing to launch userspace program.\n");
+                       return 1;
+               }
+       }
+
+       /* Up to 7 args supported */
+       while (arg < 7) {
+               sscanf(orig_posn, "%s", test_read);
+               size = strlen(test_read);
+               if (!(size))
+                       break;
+               argv[arg] = toi_kzalloc(5, size + 1, TOI_ATOMIC_GFP);
+               strcpy(argv[arg], test_read);
+               orig_posn += size + 1;
+               *test_read = 0;
+               arg++;
+       }
+
+       if (channel_no) {
+               sprintf(channel, "-c%d", channel_no);
+               argv[arg] = channel;
+       } else
+               arg--;
+
+       retval = call_usermodehelper(argv[0], argv, envp, wait);
+
+       /*
+        * If the program reports an error, retval = 256. Don't complain
+        * about that here.
+        */
+       if (retval && retval != 256)
+               printk("Failed to launch userspace program '%s': Error %d\n",
+                               command, retval);
+
+       {
+               int i;
+               for (i = 0; i < arg; i++)
+                       if (argv[i] && argv[i] != channel)
+                               toi_kfree(5, argv[i]);
+       }
+
+       toi_kfree(4, channel);
+
+       return retval;
+}
+
+/*
+ * This array contains entries that are automatically registered at
+ * boot. Modules and the console code register their own entries separately.
+ */
+static struct toi_sysfs_data sysfs_params[] = {
+       { TOI_ATTR("extra_pages_allowance", SYSFS_RW),
+         SYSFS_LONG(&extra_pd1_pages_allowance, 0,
+                       LONG_MAX, 0)
+       },
+
+       { TOI_ATTR("image_exists", SYSFS_RW),
+         SYSFS_CUSTOM(image_exists_read, image_exists_write,
+                         SYSFS_NEEDS_SM_FOR_BOTH)
+       },
+
+       { TOI_ATTR("resume", SYSFS_RW),
+         SYSFS_STRING(resume_file, 255, SYSFS_NEEDS_SM_FOR_WRITE),
+         .write_side_effect = attempt_to_parse_resume_device2,
+       },
+
+       { TOI_ATTR("alt_resume_param", SYSFS_RW),
+         SYSFS_STRING(alt_resume_param, 255, SYSFS_NEEDS_SM_FOR_WRITE),
+         .write_side_effect = attempt_to_parse_alt_resume_param,
+       },
+       { TOI_ATTR("debug_info", SYSFS_READONLY),
+         SYSFS_CUSTOM(get_toi_debug_info, NULL, 0)
+       },
+
+       { TOI_ATTR("ignore_rootfs", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_IGNORE_ROOTFS, 0)
+       },
+
+       { TOI_ATTR("image_size_limit", SYSFS_RW),
+         SYSFS_INT(&image_size_limit, -2, INT_MAX, 0)
+       },
+
+       { TOI_ATTR("last_result", SYSFS_RW),
+         SYSFS_UL(&toi_result, 0, 0, 0)
+       },
+
+       { TOI_ATTR("no_multithreaded_io", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_NO_MULTITHREADED_IO, 0)
+       },
+
+       { TOI_ATTR("no_flusher_thread", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_NO_FLUSHER_THREAD, 0)
+       },
+
+       { TOI_ATTR("full_pageset2", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_PAGESET2_FULL, 0)
+       },
+
+       { TOI_ATTR("reboot", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_REBOOT, 0)
+       },
+
+       { TOI_ATTR("replace_swsusp", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_REPLACE_SWSUSP, 0)
+       },
+
+       { TOI_ATTR("resume_commandline", SYSFS_RW),
+         SYSFS_STRING(toi_bkd.toi_nosave_commandline, COMMAND_LINE_SIZE, 0)
+       },
+
+       { TOI_ATTR("version", SYSFS_READONLY),
+         SYSFS_STRING(TOI_CORE_VERSION, 0, 0)
+       },
+
+       { TOI_ATTR("no_load_direct", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_NO_DIRECT_LOAD, 0)
+       },
+
+       { TOI_ATTR("freezer_test", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_FREEZER_TEST, 0)
+       },
+
+       { TOI_ATTR("test_bio", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_TEST_BIO, 0)
+       },
+
+       { TOI_ATTR("test_filter_speed", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_TEST_FILTER_SPEED, 0)
+       },
+
+       { TOI_ATTR("no_pageset2", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_NO_PAGESET2, 0)
+       },
+
+       { TOI_ATTR("late_cpu_hotplug", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_LATE_CPU_HOTPLUG, 0)
+       },
+
+       { TOI_ATTR("pre_hibernate_command", SYSFS_RW),
+         SYSFS_STRING(pre_hibernate_command, 0, 255)
+       },
+
+       { TOI_ATTR("post_hibernate_command", SYSFS_RW),
+         SYSFS_STRING(post_hibernate_command, 0, 255)
+       },
+
+#ifdef CONFIG_TOI_KEEP_IMAGE
+       { TOI_ATTR("keep_image", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_KEEP_IMAGE, 0)
+       },
+#endif
+};
+
+struct toi_core_fns my_fns = {
+       .get_nonconflicting_page = __toi_get_nonconflicting_page,
+       .post_context_save = __toi_post_context_save,
+       .try_hibernate = _toi_try_hibernate,
+       .try_resume = _toi_try_resume,
+};
+
+/**
+ * core_load: Initialisation of TuxOnIce core.
+ *
+ * Initialise the core, beginning with sysfs. Checksum and so on are part of
+ * the core, but have their own initialisation routines because they either
+ * aren't compiled in all the time or have their own subdirectories.
+ */
+static __init int core_load(void)
+{
+       int i,
+           numfiles = sizeof(sysfs_params) / sizeof(struct toi_sysfs_data);
+
+       printk(KERN_INFO "TuxOnIce " TOI_CORE_VERSION
+                       " (http://tuxonice.net)\n");
+       strncpy(pre_hibernate_command, CONFIG_TOI_DEFAULT_PRE_HIBERNATE, 255);
+       strncpy(post_hibernate_command, CONFIG_TOI_DEFAULT_POST_HIBERNATE, 255);
+
+       if (toi_sysfs_init())
+               return 1;
+
+       for (i = 0; i < numfiles; i++)
+               toi_register_sysfs_file(tuxonice_kobj, &sysfs_params[i]);
+
+       toi_core_fns = &my_fns;
+
+       if (toi_alloc_init())
+               return 1;
+       if (toi_checksum_init())
+               return 1;
+       if (toi_cluster_init())
+               return 1;
+       if (toi_usm_init())
+               return 1;
+       if (toi_ui_init())
+               return 1;
+       if (toi_poweroff_init())
+               return 1;
+
+       return 0;
+}
+
+#ifdef MODULE
+/**
+ * core_unload: Prepare to unload the core code.
+ */
+static __exit void core_unload(void)
+{
+       int i,
+           numfiles = sizeof(sysfs_params) / sizeof(struct toi_sysfs_data);
+
+       toi_alloc_exit();
+       toi_poweroff_exit();
+       toi_ui_exit();
+       toi_checksum_exit();
+       toi_cluster_exit();
+       toi_usm_exit();
+
+       for (i = 0; i < numfiles; i++)
+               toi_unregister_sysfs_file(tuxonice_kobj, &sysfs_params[i]);
+
+       toi_core_fns = NULL;
+
+       toi_sysfs_exit();
+}
+MODULE_LICENSE("GPL");
+module_init(core_load);
+module_exit(core_unload);
+#else
+late_initcall(core_load);
+#endif
+
+#ifdef CONFIG_TOI_EXPORTS
+EXPORT_SYMBOL_GPL(tuxonice_signature);
+EXPORT_SYMBOL_GPL(pagedir2);
+EXPORT_SYMBOL_GPL(toi_fail_num);
+EXPORT_SYMBOL_GPL(do_check_can_resume);
+#endif
diff --git a/kernel/power/tuxonice_io.c b/kernel/power/tuxonice_io.c
new file mode 100644
index 0000000..556ec22
--- /dev/null
+++ b/kernel/power/tuxonice_io.c
@@ -0,0 +1,1427 @@
+/*
+ * kernel/power/tuxonice_io.c
+ *
+ * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
+ * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr>
+ * Copyright (C) 2002-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It contains high level IO routines for hibernating.
+ *
+ */
+
+#include <linux/suspend.h>
+#include <linux/version.h>
+#include <linux/utsname.h>
+#include <linux/mount.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <linux/kthread.h>
+#include <linux/dyn_pageflags.h>
+#include <asm/tlbflush.h>
+
+#include "tuxonice.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_pageflags.h"
+#include "tuxonice_io.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_storage.h"
+#include "tuxonice_prepare_image.h"
+#include "tuxonice_extent.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_builtin.h"
+#include "tuxonice_checksum.h"
+#include "tuxonice_alloc.h"
+char alt_resume_param[256];
+
+/* Variables shared between threads and updated under the mutex */
+static int io_write, io_finish_at, io_base, io_barmax, io_pageset, io_result;
+static int io_index, io_nextupdate, io_pc, io_pc_step;
+static unsigned long pfn, other_pfn;
+static DEFINE_MUTEX(io_mutex);
+static DEFINE_PER_CPU(struct page *, last_sought);
+static DEFINE_PER_CPU(struct page *, last_high_page);
+static DEFINE_PER_CPU(char *, checksum_locn);
+static DEFINE_PER_CPU(struct pbe *, last_low_page);
+static atomic_t io_count;
+atomic_t toi_io_workers;
+DECLARE_WAIT_QUEUE_HEAD(toi_io_queue_flusher);
+int toi_bio_queue_flusher_should_finish;
+
+/* toi_attempt_to_parse_resume_device
+ *
+ * Can we hibernate, using the current resume= parameter?
+ */
+int toi_attempt_to_parse_resume_device(int quiet)
+{
+       struct list_head *Allocator;
+       struct toi_module_ops *thisAllocator;
+       int result, returning = 0;
+
+       if (toi_activate_storage(0))
+               return 0;
+
+       toiActiveAllocator = NULL;
+       clear_toi_state(TOI_RESUME_DEVICE_OK);
+       clear_toi_state(TOI_CAN_RESUME);
+       clear_result_state(TOI_ABORTED);
+
+       if (!toiNumAllocators) {
+               if (!quiet)
+                       printk(KERN_INFO "TuxOnIce: No storage allocators have "
+                               "been registered. Hibernating will be "
+                               "disabled.\n");
+               goto cleanup;
+       }
+
+       if (!resume_file[0]) {
+               if (!quiet)
+                       printk("TuxOnIce: Resume= parameter is empty."
+                               " Hibernating will be disabled.\n");
+               goto cleanup;
+       }
+
+       list_for_each(Allocator, &toiAllocators) {
+               thisAllocator = list_entry(Allocator, struct toi_module_ops,
+                                                               type_list);
+
+               /*
+                * Not sure why you'd want to disable an allocator, but
+                * we should honour the flag if we're providing it
+                */
+               if (!thisAllocator->enabled)
+                       continue;
+
+               result = thisAllocator->parse_sig_location(
+                               resume_file, (toiNumAllocators == 1),
+                               quiet);
+
+               switch (result) {
+               case -EINVAL:
+                       /* For this allocator, but not a valid
+                        * configuration. Error already printed. */
+                       goto cleanup;
+
+               case 0:
+                       /* For this allocator and valid. */
+                       toiActiveAllocator = thisAllocator;
+
+                       set_toi_state(TOI_RESUME_DEVICE_OK);
+                       set_toi_state(TOI_CAN_RESUME);
+                       returning = 1;
+                       goto cleanup;
+               }
+       }
+       if (!quiet)
+               printk("TuxOnIce: No matching enabled allocator found. "
+                               "Resuming disabled.\n");
+cleanup:
+       toi_deactivate_storage(0);
+       return returning;
+}
+
+void attempt_to_parse_resume_device2(void)
+{
+       toi_prepare_usm();
+       toi_attempt_to_parse_resume_device(0);
+       toi_cleanup_usm();
+}
+
+void save_restore_alt_param(int replace, int quiet)
+{
+       static char resume_param_save[255];
+       static unsigned long toi_state_save;
+
+       if (replace) {
+               toi_state_save = toi_state;
+               strcpy(resume_param_save, resume_file);
+               strcpy(resume_file, alt_resume_param);
+       } else {
+               strcpy(resume_file, resume_param_save);
+               toi_state = toi_state_save;
+       }
+       toi_attempt_to_parse_resume_device(quiet);
+}
+
+void attempt_to_parse_alt_resume_param(void)
+{
+       int ok = 0;
+
+       /* Temporarily set resume_param to the poweroff value */
+       if (!strlen(alt_resume_param))
+               return;
+
+       printk("=== Trying Poweroff Resume2 ===\n");
+       save_restore_alt_param(SAVE, NOQUIET);
+       if (test_toi_state(TOI_CAN_RESUME))
+               ok = 1;
+
+       printk(KERN_INFO "=== Done ===\n");
+       save_restore_alt_param(RESTORE, QUIET);
+
+       /* If not ok, clear the string */
+       if (ok)
+               return;
+
+       printk(KERN_INFO "Can't resume from that location; clearing "
+                       "alt_resume_param.\n");
+       alt_resume_param[0] = '\0';
+}
+
+/* noresume_reset_modules
+ *
+ * Description:        When we read the start of an image, modules (and especially the
+ *             active allocator) might need to reset data structures if we
+ *             decide to remove the image rather than resuming from it.
+ */
+
+static void noresume_reset_modules(void)
+{
+       struct toi_module_ops *this_filter;
+
+       list_for_each_entry(this_filter, &toi_filters, type_list)
+               if (this_filter->noresume_reset)
+                       this_filter->noresume_reset();
+
+       if (toiActiveAllocator && toiActiveAllocator->noresume_reset)
+               toiActiveAllocator->noresume_reset();
+}
+
+/* fill_toi_header()
+ *
+ * Description:        Fill the hibernate header structure.
+ * Arguments:  struct toi_header: Header data structure to be filled.
+ */
+
+static int fill_toi_header(struct toi_header *sh)
+{
+       int i, error;
+
+       error = init_swsusp_header((struct swsusp_info *) sh);
+       if (error)
+               return error;
+
+       sh->pagedir = pagedir1;
+       sh->pageset_2_size = pagedir2.size;
+       sh->param0 = toi_result;
+       sh->param1 = toi_bkd.toi_action;
+       sh->param2 = toi_bkd.toi_debug_state;
+       sh->param3 = toi_bkd.toi_default_console_level;
+       sh->root_fs = current->fs->root.mnt->mnt_sb->s_dev;
+       for (i = 0; i < 4; i++)
+               sh->io_time[i/2][i%2] = toi_bkd.toi_io_time[i/2][i%2];
+       sh->bkd = boot_kernel_data_buffer;
+       return 0;
+}
+
+/*
+ * rw_init_modules
+ *
+ * Iterate over modules, preparing the ones that will be used to read or write
+ * data.
+ */
+static int rw_init_modules(int rw, int which)
+{
+       struct toi_module_ops *this_module;
+       /* Initialise page transformers */
+       list_for_each_entry(this_module, &toi_filters, type_list) {
+               if (!this_module->enabled)
+                       continue;
+               if (this_module->rw_init && this_module->rw_init(rw, which)) {
+                       abort_hibernate(TOI_FAILED_MODULE_INIT,
+                               "Failed to initialise the %s filter.",
+                               this_module->name);
+                       return 1;
+               }
+       }
+
+       /* Initialise allocator */
+       if (toiActiveAllocator->rw_init(rw, which)) {
+               abort_hibernate(TOI_FAILED_MODULE_INIT,
+                               "Failed to initialise the allocator.");
+               return 1;
+       }
+
+       /* Initialise other modules */
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               if (!this_module->enabled ||
+                   this_module->type == FILTER_MODULE ||
+                   this_module->type == WRITER_MODULE)
+                       continue;
+               if (this_module->rw_init && this_module->rw_init(rw, which)) {
+                       set_abort_result(TOI_FAILED_MODULE_INIT);
+                       printk(KERN_INFO "Setting aborted flag due to module "
+                                       "init failure.\n");
+                       return 1;
+               }
+       }
+
+       return 0;
+}
+
+/*
+ * rw_cleanup_modules
+ *
+ * Cleanup components after reading or writing a set of pages.
+ * Only the allocator may fail.
+ */
+static int rw_cleanup_modules(int rw)
+{
+       struct toi_module_ops *this_module;
+       int result = 0;
+
+       /* Cleanup other modules */
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               if (!this_module->enabled ||
+                   this_module->type == FILTER_MODULE ||
+                   this_module->type == WRITER_MODULE)
+                       continue;
+               if (this_module->rw_cleanup)
+                       result |= this_module->rw_cleanup(rw);
+       }
+
+       /* Flush data and cleanup */
+       list_for_each_entry(this_module, &toi_filters, type_list) {
+               if (!this_module->enabled)
+                       continue;
+               if (this_module->rw_cleanup)
+                       result |= this_module->rw_cleanup(rw);
+       }
+
+       result |= toiActiveAllocator->rw_cleanup(rw);
+
+       return result;
+}
+
+static struct page *copy_page_from_orig_page(struct page *orig_page)
+{
+       int is_high = PageHighMem(orig_page), index, min, max;
+       struct page *high_page = NULL,
+                   **my_last_high_page = &__get_cpu_var(last_high_page),
+                   **my_last_sought = &__get_cpu_var(last_sought);
+       struct pbe *this, **my_last_low_page = &__get_cpu_var(last_low_page);
+       void *compare;
+
+       if (is_high) {
+               if (*my_last_sought && *my_last_high_page &&
+                               *my_last_sought < orig_page)
+                       high_page = *my_last_high_page;
+               else
+                       high_page = (struct page *) restore_highmem_pblist;
+               this = (struct pbe *) kmap(high_page);
+               compare = orig_page;
+       } else {
+               if (*my_last_sought && *my_last_low_page &&
+                               *my_last_sought < orig_page)
+                       this = *my_last_low_page;
+               else
+                       this = restore_pblist;
+               compare = page_address(orig_page);
+       }
+
+       *my_last_sought = orig_page;
+
+       /* Locate page containing pbe */
+       while (this[PBES_PER_PAGE - 1].next &&
+                       this[PBES_PER_PAGE - 1].orig_address < compare) {
+               if (is_high) {
+                       struct page *next_high_page = (struct page *)
+                               this[PBES_PER_PAGE - 1].next;
+                       kunmap(high_page);
+                       this = kmap(next_high_page);
+                       high_page = next_high_page;
+               } else
+                       this = this[PBES_PER_PAGE - 1].next;
+       }
+
+       /* Do a binary search within the page */
+       min = 0;
+       max = PBES_PER_PAGE;
+       index = PBES_PER_PAGE / 2;
+       while (max - min) {
+               if (!this[index].orig_address ||
+                   this[index].orig_address > compare)
+                       max = index;
+               else if (this[index].orig_address == compare) {
+                       if (is_high) {
+                               struct page *page = this[index].address;
+                               *my_last_high_page = high_page;
+                               kunmap(high_page);
+                               return page;
+                       }
+                       *my_last_low_page = this;
+                       return virt_to_page(this[index].address);
+               } else
+                       min = index;
+               index = ((max + min) / 2);
+       };
+
+       if (is_high)
+               kunmap(high_page);
+
+       abort_hibernate(TOI_FAILED_IO, "Failed to get destination page for"
+               " orig page %p. This[min].orig_address=%p.\n", orig_page,
+               this[index].orig_address);
+       return NULL;
+}
+
+/*
+ * do_rw_loop
+ *
+ * The main I/O loop for reading or writing pages.
+ */
+static int worker_rw_loop(void *data)
+{
+       unsigned long orig_pfn, write_pfn;
+       int result, my_io_index = 0, temp;
+       struct toi_module_ops *first_filter = toi_get_next_filter(NULL);
+       struct page *buffer = toi_alloc_page(28, TOI_ATOMIC_GFP);
+
+       atomic_inc(&toi_io_workers);
+       mutex_lock(&io_mutex);
+
+       do {
+               int buf_size;
+
+               /*
+                * What page to use? If reading, don't know yet which page's
+                * data will be read, so always use the buffer. If writing,
+                * use the copy (Pageset1) or original page (Pageset2), but
+                * always write the pfn of the original page.
+                */
+               if (io_write) {
+                       struct page *page;
+                       char **my_checksum_locn = &__get_cpu_var(checksum_locn);
+
+                       pfn = get_next_bit_on(&io_map, pfn);
+
+                       /* Another thread could have beaten us to it. */
+                       if (pfn == max_pfn + 1) {
+                               if (atomic_read(&io_count)) {
+                                       printk("Ran out of pfns but io_count "
+                                               "is still %d.\n",
+                                               atomic_read(&io_count));
+                                       BUG();
+                               }
+                               break;
+                       }
+
+                       my_io_index = io_finish_at -
+                               atomic_sub_return(1, &io_count);
+
+                       orig_pfn = pfn;
+                       write_pfn = pfn;
+
+                       /*
+                        * Other_pfn is updated by all threads, so we're not
+                        * writing the same page multiple times.
+                        */
+                       clear_dynpageflag(&io_map, pfn_to_page(pfn));
+                       if (io_pageset == 1) {
+                               other_pfn = get_next_bit_on(&pageset1_map,
+                                               other_pfn);
+                               write_pfn = other_pfn;
+                       }
+                       page = pfn_to_page(pfn);
+
+                       if (io_pageset == 2)
+                               *my_checksum_locn =
+                                       tuxonice_get_next_checksum();
+
+                       mutex_unlock(&io_mutex);
+
+                       if (io_pageset == 2 &&
+                           tuxonice_calc_checksum(page, *my_checksum_locn))
+                                       return 1;
+
+                       result = first_filter->write_page(write_pfn, page,
+                                       PAGE_SIZE);
+               } else {
+                       my_io_index = io_finish_at -
+                               atomic_sub_return(1, &io_count);
+                       mutex_unlock(&io_mutex);
+
+                       /*
+                        * Are we aborting? If so, don't submit any more I/O as
+                        * resetting the resume_attempted flag (from ui.c) will
+                        * clear the bdev flags, making this thread oops.
+                        */
+                       if (unlikely(test_toi_state(TOI_STOP_RESUME))) {
+                               atomic_dec(&toi_io_workers);
+                               if (!atomic_read(&toi_io_workers))
+                                       set_toi_state(TOI_IO_STOPPED);
+                               while (1)
+                                       schedule();
+                       }
+
+                       result = first_filter->read_page(&write_pfn, buffer,
+                                       &buf_size);
+                       if (buf_size != PAGE_SIZE) {
+                               abort_hibernate(TOI_FAILED_IO,
+                                       "I/O pipeline returned %d bytes instead"
+                                       " of %d.\n", buf_size, PAGE_SIZE);
+                               mutex_lock(&io_mutex);
+                               break;
+                       }
+               }
+
+               if (result) {
+                       io_result = result;
+                       if (io_write) {
+                               printk(KERN_INFO "Write chunk returned %d.\n",
+                                               result);
+                               abort_hibernate(TOI_FAILED_IO,
+                                       "Failed to write a chunk of the "
+                                       "image.");
+                               mutex_lock(&io_mutex);
+                               break;
+                       }
+                       panic("Read chunk returned (%d)", result);
+               }
+
+               /*
+                * Discard reads of resaved pages while reading ps2
+                * and unwanted pages while rereading ps2 when aborting.
+                */
+               if (!io_write && !PageResave(pfn_to_page(write_pfn))) {
+                       struct page *final_page = pfn_to_page(write_pfn),
+                                   *copy_page = final_page;
+                       char *virt, *buffer_virt;
+
+                       if (io_pageset == 1 && !load_direct(final_page)) {
+                               copy_page =
+                                       copy_page_from_orig_page(final_page);
+                               BUG_ON(!copy_page);
+                       }
+
+                       if (test_dynpageflag(&io_map, final_page)) {
+                               virt = kmap(copy_page);
+                               buffer_virt = kmap(buffer);
+                               memcpy(virt, buffer_virt, PAGE_SIZE);
+                               kunmap(copy_page);
+                               kunmap(buffer);
+                               clear_dynpageflag(&io_map, final_page);
+                       } else {
+                               mutex_lock(&io_mutex);
+                               atomic_inc(&io_count);
+                               mutex_unlock(&io_mutex);
+                       }
+               }
+
+               temp = my_io_index + io_base - io_nextupdate;
+
+               if (my_io_index + io_base == io_nextupdate)
+                       io_nextupdate = toi_update_status(my_io_index +
+                               io_base, io_barmax, " %d/%d MB ",
+                               MB(io_base+my_io_index+1), MB(io_barmax));
+
+               if (my_io_index == io_pc) {
+                       printk("%s%d%%...", io_pc_step == 1 ? KERN_ERR : "",
+                                       20 * io_pc_step);
+                       io_pc_step++;
+                       io_pc = io_finish_at * io_pc_step / 5;
+               }
+
+               toi_cond_pause(0, NULL);
+
+               /*
+                * Subtle: If there's less I/O still to be done than threads
+                * running, quit. This stops us doing I/O beyond the end of
+                * the image when reading.
+                *
+                * Possible race condition. Two threads could do the test at
+                * the same time; one should exit and one should continue.
+                * Therefore we take the mutex before comparing and exiting.
+                */
+
+               mutex_lock(&io_mutex);
+
+       } while (atomic_read(&io_count) >= atomic_read(&toi_io_workers) &&
+               !(io_write && test_result_state(TOI_ABORTED)));
+
+       if (atomic_dec_and_test(&toi_io_workers)) {
+               toi_bio_queue_flusher_should_finish = 1;
+               wake_up(&toi_io_queue_flusher);
+       }
+       mutex_unlock(&io_mutex);
+
+       toi__free_page(28, buffer);
+
+       return 0;
+}
+
+int start_other_threads(void)
+{
+       int cpu, num_started = 0;
+       struct task_struct *p;
+
+       for_each_online_cpu(cpu) {
+               if (cpu == smp_processor_id())
+                       continue;
+
+               p = kthread_create(worker_rw_loop, NULL, "ks2io/%d", cpu);
+               if (IS_ERR(p)) {
+                       printk("ks2io for %i failed\n", cpu);
+                       continue;
+               }
+               kthread_bind(p, cpu);
+               p->flags |= PF_MEMALLOC;
+               wake_up_process(p);
+               num_started++;
+       }
+
+       return num_started;
+}
+
+/*
+ * do_rw_loop
+ *
+ * The main I/O loop for reading or writing pages.
+ */
+static int do_rw_loop(int write, int finish_at, struct dyn_pageflags *pageflags,
+               int base, int barmax, int pageset)
+{
+       int index = 0, cpu, num_other_threads = 0;
+
+       if (!finish_at)
+               return 0;
+
+       io_write = write;
+       io_finish_at = finish_at;
+       io_base = base;
+       io_barmax = barmax;
+       io_pageset = pageset;
+       io_index = 0;
+       io_pc = io_finish_at / 5;
+       io_pc_step = 1;
+       io_result = 0;
+       io_nextupdate = base + 1;
+       toi_bio_queue_flusher_should_finish = 0;
+
+       for_each_online_cpu(cpu) {
+               per_cpu(last_sought, cpu) = NULL;
+               per_cpu(last_low_page, cpu) = NULL;
+               per_cpu(last_high_page, cpu) = NULL;
+       }
+
+       /* Ensure all bits clear */
+       clear_dyn_pageflags(&io_map);
+
+       /* Set the bits for the pages to write */
+       pfn = get_next_bit_on(pageflags, max_pfn + 1);
+
+       while (pfn < max_pfn + 1 && index < finish_at) {
+               set_dynpageflag(&io_map, pfn_to_page(pfn));
+               pfn = get_next_bit_on(pageflags, pfn);
+               index++;
+       }
+
+       BUG_ON(index < finish_at);
+
+       atomic_set(&io_count, finish_at);
+
+       pfn = max_pfn + 1;
+       other_pfn = pfn;
+
+       clear_toi_state(TOI_IO_STOPPED);
+
+       if (!test_action_state(TOI_NO_MULTITHREADED_IO))
+               num_other_threads = start_other_threads();
+
+       if (!num_other_threads || !toiActiveAllocator->io_flusher ||
+               test_action_state(TOI_NO_FLUSHER_THREAD))
+               worker_rw_loop(NULL);
+       else
+               toiActiveAllocator->io_flusher(write);
+
+       while (atomic_read(&toi_io_workers))
+               schedule();
+
+       set_toi_state(TOI_IO_STOPPED);
+       if (unlikely(test_toi_state(TOI_STOP_RESUME))) {
+               while (1)
+                       schedule();
+       }
+
+       if (!io_result) {
+               printk("done.\n");
+
+               toi_update_status(io_base + io_finish_at, io_barmax,
+                               " %d/%d MB ",
+                               MB(io_base + io_finish_at), MB(io_barmax));
+       }
+
+       if (io_write && test_result_state(TOI_ABORTED))
+               io_result = 1;
+       else { /* All I/O done? */
+               if  (get_next_bit_on(&io_map, max_pfn + 1) != max_pfn + 1) {
+                       printk(KERN_INFO "Finished I/O loop but still work to "
+                                       "do?\nFinish at = %d. io_count = %d.\n",
+                                       finish_at, atomic_read(&io_count));
+                       BUG();
+               }
+       }
+
+       return io_result;
+}
+
+/* write_pageset()
+ *
+ * Description:        Write a pageset to disk.
+ * Arguments:  pagedir:        Which pagedir to write..
+ * Returns:    Zero on success or -1 on failure.
+ */
+
+int write_pageset(struct pagedir *pagedir)
+{
+       int finish_at, base = 0, start_time, end_time;
+       int barmax = pagedir1.size + pagedir2.size;
+       long error = 0;
+       struct dyn_pageflags *pageflags;
+
+       /*
+        * Even if there is nothing to read or write, the allocator
+        * may need the init/cleanup for it's housekeeping.  (eg:
+        * Pageset1 may start where pageset2 ends when writing).
+        */
+       finish_at = pagedir->size;
+
+       if (pagedir->id == 1) {
+               toi_prepare_status(DONT_CLEAR_BAR,
+                               "Writing kernel & process data...");
+               base = pagedir2.size;
+               if (test_action_state(TOI_TEST_FILTER_SPEED) ||
+                   test_action_state(TOI_TEST_BIO))
+                       pageflags = &pageset1_map;
+               else
+                       pageflags = &pageset1_copy_map;
+       } else {
+               toi_prepare_status(CLEAR_BAR, "Writing caches...");
+               pageflags = &pageset2_map;
+       }
+
+       start_time = jiffies;
+
+       if (rw_init_modules(1, pagedir->id)) {
+               abort_hibernate(TOI_FAILED_MODULE_INIT,
+                               "Failed to initialise modules for writing.");
+               error = 1;
+       }
+
+       if (!error)
+               error = do_rw_loop(1, finish_at, pageflags, base, barmax,
+                               pagedir->id);
+
+       if (rw_cleanup_modules(WRITE) && !error) {
+               abort_hibernate(TOI_FAILED_MODULE_CLEANUP,
+                               "Failed to cleanup after writing.");
+               error = 1;
+       }
+
+       end_time = jiffies;
+
+       if ((end_time - start_time) && (!test_result_state(TOI_ABORTED))) {
+               toi_bkd.toi_io_time[0][0] += finish_at,
+               toi_bkd.toi_io_time[0][1] += (end_time - start_time);
+       }
+
+       return error;
+}
+
+/* read_pageset()
+ *
+ * Description:        Read a pageset from disk.
+ * Arguments:  whichtowrite:   Controls what debugging output is printed.
+ *             overwrittenpagesonly: Whether to read the whole pageset or
+ *             only part.
+ * Returns:    Zero on success or -1 on failure.
+ */
+
+static int read_pageset(struct pagedir *pagedir, int overwrittenpagesonly)
+{
+       int result = 0, base = 0, start_time, end_time;
+       int finish_at = pagedir->size;
+       int barmax = pagedir1.size + pagedir2.size;
+       struct dyn_pageflags *pageflags;
+
+       if (pagedir->id == 1) {
+               toi_prepare_status(CLEAR_BAR,
+                               "Reading kernel & process data...");
+               pageflags = &pageset1_map;
+       } else {
+               toi_prepare_status(DONT_CLEAR_BAR, "Reading caches...");
+               if (overwrittenpagesonly)
+                       barmax = finish_at = min(pagedir1.size,
+                                                pagedir2.size);
+               else
+                       base = pagedir1.size;
+               pageflags = &pageset2_map;
+       }
+
+       start_time = jiffies;
+
+       if (rw_init_modules(0, pagedir->id)) {
+               toiActiveAllocator->remove_image();
+               result = 1;
+       } else
+               result = do_rw_loop(0, finish_at, pageflags, base, barmax,
+                               pagedir->id);
+
+       if (rw_cleanup_modules(READ) && !result) {
+               abort_hibernate(TOI_FAILED_MODULE_CLEANUP,
+                               "Failed to cleanup after reading.");
+               result = 1;
+       }
+
+       /* Statistics */
+       end_time = jiffies;
+
+       if ((end_time - start_time) && (!test_result_state(TOI_ABORTED))) {
+               toi_bkd.toi_io_time[1][0] += finish_at,
+               toi_bkd.toi_io_time[1][1] += (end_time - start_time);
+       }
+
+       return result;
+}
+
+/* write_module_configs()
+ *
+ * Description:        Store the configuration for each module in the image header.
+ * Returns:    Int: Zero on success, Error value otherwise.
+ */
+static int write_module_configs(void)
+{
+       struct toi_module_ops *this_module;
+       char *buffer = (char *) toi_get_zeroed_page(22, TOI_ATOMIC_GFP);
+       int len, index = 1;
+       struct toi_module_header toi_module_header;
+
+       if (!buffer) {
+               printk(KERN_INFO "Failed to allocate a buffer for saving "
+                               "module configuration info.\n");
+               return -ENOMEM;
+       }
+
+       /*
+        * We have to know which data goes with which module, so we at
+        * least write a length of zero for a module. Note that we are
+        * also assuming every module's config data takes <= PAGE_SIZE.
+        */
+
+       /* For each module (in registration order) */
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               if (!this_module->enabled || !this_module->storage_needed ||
+                   (this_module->type == WRITER_MODULE &&
+                    toiActiveAllocator != this_module))
+                       continue;
+
+               /* Get the data from the module */
+               len = 0;
+               if (this_module->save_config_info)
+                       len = this_module->save_config_info(buffer);
+
+               /* Save the details of the module */
+               toi_module_header.enabled = this_module->enabled;
+               toi_module_header.type = this_module->type;
+               toi_module_header.index = index++;
+               strncpy(toi_module_header.name, this_module->name,
+                                       sizeof(toi_module_header.name));
+               toiActiveAllocator->rw_header_chunk(WRITE,
+                               this_module,
+                               (char *) &toi_module_header,
+                               sizeof(toi_module_header));
+
+               /* Save the size of the data and any data returned */
+               toiActiveAllocator->rw_header_chunk(WRITE,
+                               this_module,
+                               (char *) &len, sizeof(int));
+               if (len)
+                       toiActiveAllocator->rw_header_chunk(
+                               WRITE, this_module, buffer, len);
+       }
+
+       /* Write a blank header to terminate the list */
+       toi_module_header.name[0] = '\0';
+       toiActiveAllocator->rw_header_chunk(WRITE, NULL,
+                       (char *) &toi_module_header, sizeof(toi_module_header));
+
+       toi_free_page(22, (unsigned long) buffer);
+       return 0;
+}
+
+/* read_module_configs()
+ *
+ * Description:        Reload module configurations from the image header.
+ * Returns:    Int. Zero on success, error value otherwise.
+ */
+
+static int read_module_configs(void)
+{
+       struct toi_module_ops *this_module;
+       char *buffer = (char *) toi_get_zeroed_page(23, TOI_ATOMIC_GFP);
+       int len, result = 0;
+       struct toi_module_header toi_module_header;
+
+       if (!buffer) {
+               printk("Failed to allocate a buffer for reloading module "
+                               "configuration info.\n");
+               return -ENOMEM;
+       }
+
+       /* All modules are initially disabled. That way, if we have a module
+        * loaded now that wasn't loaded when we hibernated, it won't be used
+        * in trying to read the data.
+        */
+       list_for_each_entry(this_module, &toi_modules, module_list)
+               this_module->enabled = 0;
+
+       /* Get the first module header */
+       result = toiActiveAllocator->rw_header_chunk(READ, NULL,
+                       (char *) &toi_module_header,
+                       sizeof(toi_module_header));
+       if (result) {
+               printk("Failed to read the next module header.\n");
+               toi_free_page(23, (unsigned long) buffer);
+               return -EINVAL;
+       }
+
+       /* For each module (in registration order) */
+       while (toi_module_header.name[0]) {
+
+               /* Find the module */
+               this_module =
+                       toi_find_module_given_name(toi_module_header.name);
+
+               if (!this_module) {
+                       /*
+                        * Is it used? Only need to worry about filters. The
+                        * active allocator must be loaded!
+                        */
+                       if (toi_module_header.enabled) {
+                               toi_early_boot_message(1, TOI_CONTINUE_REQ,
+                                       "It looks like we need module %s for "
+                                       "reading the image but it hasn't been "
+                                       "registered.\n",
+                                       toi_module_header.name);
+                               if (!(test_toi_state(TOI_CONTINUE_REQ))) {
+                                       toi_free_page(23,
+                                                       (unsigned long) buffer);
+                                       return -EINVAL;
+                               }
+                       } else
+                               printk(KERN_INFO "Module %s configuration data "
+                                       "found, but the module hasn't "
+                                       "registered. Looks like it was "
+                                       "disabled, so we're ignoring its data.",
+                                       toi_module_header.name);
+               }
+
+               /* Get the length of the data (if any) */
+               result = toiActiveAllocator->rw_header_chunk(READ, NULL,
+                               (char *) &len, sizeof(int));
+               if (result) {
+                       printk("Failed to read the length of the module %s's"
+                                       " configuration data.\n",
+                                       toi_module_header.name);
+                       toi_free_page(23, (unsigned long) buffer);
+                       return -EINVAL;
+               }
+
+               /* Read any data and pass to the module (if we found one) */
+               if (len) {
+                       toiActiveAllocator->rw_header_chunk(READ, NULL,
+                                       buffer, len);
+                       if (this_module) {
+                               if (!this_module->save_config_info) {
+                                       printk("Huh? Module %s appears to have "
+                                               "a save_config_info, but not a "
+                                               "load_config_info function!\n",
+                                               this_module->name);
+                               } else
+                                       this_module->load_config_info(buffer,
+                                                       len);
+                       }
+               }
+
+               if (this_module) {
+                       /* Now move this module to the tail of its lists. This
+                        * will put it in order. Any new modules will end up at
+                        * the top of the lists. They should have been set to
+                        * disabled when loaded (people will normally not edit
+                        * an initrd to load a new module and then hibernate
+                        * without using it!).
+                        */
+
+                       toi_move_module_tail(this_module);
+
+                       /*
+                        * We apply the disabled state; modules don't need to
+                        * save whether they were disabled and if they do, we
+                        * override them anyway.
+                        */
+                       this_module->enabled = toi_module_header.enabled;
+               }
+
+               /* Get the next module header */
+               result = toiActiveAllocator->rw_header_chunk(READ, NULL,
+                               (char *) &toi_module_header,
+                               sizeof(toi_module_header));
+
+               if (result) {
+                       printk("Failed to read the next module header.\n");
+                       toi_free_page(23, (unsigned long) buffer);
+                       return -EINVAL;
+               }
+
+       }
+
+       toi_free_page(23, (unsigned long) buffer);
+       return 0;
+}
+
+/* write_image_header()
+ *
+ * Description:        Write the image header after write the image proper.
+ * Returns:    Int. Zero on success or -1 on failure.
+ */
+
+int write_image_header(void)
+{
+       int ret;
+       int total = pagedir1.size + pagedir2.size+2;
+       char *header_buffer = NULL;
+
+       /* Now prepare to write the header */
+       ret = toiActiveAllocator->write_header_init();
+       if (ret) {
+               abort_hibernate(TOI_FAILED_MODULE_INIT,
+                               "Active allocator's write_header_init"
+                               " function failed.");
+               goto write_image_header_abort;
+       }
+
+       /* Get a buffer */
+       header_buffer = (char *) toi_get_zeroed_page(24, TOI_ATOMIC_GFP);
+       if (!header_buffer) {
+               abort_hibernate(TOI_OUT_OF_MEMORY,
+                       "Out of memory when trying to get page for header!");
+               goto write_image_header_abort;
+       }
+
+       /* Write hibernate header */
+       if (fill_toi_header((struct toi_header *) header_buffer)) {
+               abort_hibernate(TOI_OUT_OF_MEMORY,
+                       "Failure to fill header information!");
+               goto write_image_header_abort;
+       }
+       toiActiveAllocator->rw_header_chunk(WRITE, NULL,
+                       header_buffer, sizeof(struct toi_header));
+
+       toi_free_page(24, (unsigned long) header_buffer);
+
+       /* Write module configurations */
+       ret = write_module_configs();
+       if (ret) {
+               abort_hibernate(TOI_FAILED_IO,
+                               "Failed to write module configs.");
+               goto write_image_header_abort;
+       }
+
+       save_dyn_pageflags(&pageset1_map);
+
+       /* Flush data and let allocator cleanup */
+       if (toiActiveAllocator->write_header_cleanup()) {
+               abort_hibernate(TOI_FAILED_IO,
+                               "Failed to cleanup writing header.");
+               goto write_image_header_abort_no_cleanup;
+       }
+
+       if (test_result_state(TOI_ABORTED))
+               goto write_image_header_abort_no_cleanup;
+
+       toi_update_status(total, total, NULL);
+
+       return 0;
+
+write_image_header_abort:
+       toiActiveAllocator->write_header_cleanup();
+write_image_header_abort_no_cleanup:
+       return -1;
+}
+
+/* sanity_check()
+ *
+ * Description:        Perform a few checks, seeking to ensure that the kernel being
+ *             booted matches the one hibernated. They need to match so we can
+ *             be _sure_ things will work. It is not absolutely impossible for
+ *             resuming from a different kernel to work, just not assured.
+ * Arguments:  Struct toi_header. The header which was saved at hibernate
+ *             time.
+ */
+static char *sanity_check(struct toi_header *sh)
+{
+       char *reason = check_swsusp_image_kernel((struct swsusp_info *) sh);
+
+       if (reason)
+               return reason;
+
+       if (!test_action_state(TOI_IGNORE_ROOTFS)) {
+               const struct super_block *sb;
+               list_for_each_entry(sb, &super_blocks, s_list) {
+                       if ((!(sb->s_flags & MS_RDONLY)) &&
+                           (sb->s_type->fs_flags & FS_REQUIRES_DEV))
+                               return "Device backed fs has been mounted "
+                                       "rw prior to resume or initrd/ramfs "
+                                       "is mounted rw.";
+               }
+       }
+
+       return 0;
+}
+
+/* __read_pageset1
+ *
+ * Description:        Test for the existence of an image and attempt to load it.
+ * Returns:    Int. Zero if image found and pageset1 successfully loaded.
+ *             Error if no image found or loaded.
+ */
+static int __read_pageset1(void)
+{
+       int i, result = 0;
+       char *header_buffer = (char *) toi_get_zeroed_page(25, TOI_ATOMIC_GFP),
+            *sanity_error = NULL;
+       struct toi_header *toi_header;
+
+       if (!header_buffer) {
+               printk(KERN_INFO "Unable to allocate a page for reading the "
+                               "signature.\n");
+               return -ENOMEM;
+       }
+
+       /* Check for an image */
+       result = toiActiveAllocator->image_exists(1);
+       if (!result) {
+               result = -ENODATA;
+               noresume_reset_modules();
+               printk(KERN_INFO "TuxOnIce: No image found.\n");
+               goto out;
+       }
+
+       /*
+        * Prepare the active allocator for reading the image header. The
+        * activate allocator might read its own configuration.
+        *
+        * NB: This call may never return because there might be a signature
+        * for a different image such that we warn the user and they choose
+        * to reboot. (If the device ids look erroneous (2.4 vs 2.6) or the
+        * location of the image might be unavailable if it was stored on a
+        * network connection).
+        */
+
+       result = toiActiveAllocator->read_header_init();
+       if (result) {
+               printk(KERN_INFO "TuxOnIce: Failed to initialise, reading the "
+                               "image header.\n");
+               goto out_remove_image;
+       }
+
+       /* Check for noresume command line option */
+       if (test_toi_state(TOI_NORESUME_SPECIFIED)) {
+               printk(KERN_INFO "TuxOnIce: Noresume on command line. Removed "
+                               "image.\n");
+               goto out_remove_image;
+       }
+
+       /* Check whether we've resumed before */
+       if (test_toi_state(TOI_RESUMED_BEFORE)) {
+               toi_early_boot_message(1, 0, NULL);
+               if (!(test_toi_state(TOI_CONTINUE_REQ))) {
+                       printk(KERN_INFO "TuxOnIce: Tried to resume before: "
+                                       "Invalidated image.\n");
+                       goto out_remove_image;
+               }
+       }
+
+       clear_toi_state(TOI_CONTINUE_REQ);
+
+       /* Read hibernate header */
+       result = toiActiveAllocator->rw_header_chunk(READ, NULL,
+                       header_buffer, sizeof(struct toi_header));
+       if (result < 0) {
+               printk("TuxOnIce: Failed to read the image signature.\n");
+               goto out_remove_image;
+       }
+
+       toi_header = (struct toi_header *) header_buffer;
+
+       /*
+        * NB: This call may also result in a reboot rather than returning.
+        */
+
+       sanity_error = sanity_check(toi_header);
+       if (sanity_error) {
+               toi_early_boot_message(1, TOI_CONTINUE_REQ,
+                               sanity_error);
+               printk(KERN_INFO "TuxOnIce: Sanity check failed.\n");
+               goto out_remove_image;
+       }
+
+       /*
+        * We have an image and it looks like it will load okay.
+        *
+        * Get metadata from header. Don't override commandline parameters.
+        *
+        * We don't need to save the image size limit because it's not used
+        * during resume and will be restored with the image anyway.
+        */
+
+       memcpy((char *) &pagedir1,
+               (char *) &toi_header->pagedir, sizeof(pagedir1));
+       toi_result = toi_header->param0;
+       toi_bkd.toi_action = toi_header->param1;
+       toi_bkd.toi_debug_state = toi_header->param2;
+       toi_bkd.toi_default_console_level = toi_header->param3;
+       clear_toi_state(TOI_IGNORE_LOGLEVEL);
+       pagedir2.size = toi_header->pageset_2_size;
+       for (i = 0; i < 4; i++)
+               toi_bkd.toi_io_time[i/2][i%2] =
+                       toi_header->io_time[i/2][i%2];
+       boot_kernel_data_buffer = toi_header->bkd;
+
+       /* Read module configurations */
+       result = read_module_configs();
+       if (result) {
+               pagedir1.size = pagedir2.size = 0;
+               printk(KERN_INFO "TuxOnIce: Failed to read TuxOnIce module "
+                               "configurations.\n");
+               clear_action_state(TOI_KEEP_IMAGE);
+               goto out_remove_image;
+       }
+
+       toi_prepare_console();
+
+       set_toi_state(TOI_NOW_RESUMING);
+
+       if (pre_resume_freeze())
+               goto out_reset_console;
+
+       toi_cond_pause(1, "About to read original pageset1 locations.");
+
+       /*
+        * Read original pageset1 locations. These are the addresses we can't
+        * use for the data to be restored.
+        */
+
+       if (allocate_dyn_pageflags(&pageset1_map, 0) ||
+           allocate_dyn_pageflags(&pageset1_copy_map, 0) ||
+           allocate_dyn_pageflags(&io_map, 0))
+               goto out_reset_console;
+
+       if (load_dyn_pageflags(&pageset1_map))
+               goto out_reset_console;
+
+       /* Clean up after reading the header */
+       result = toiActiveAllocator->read_header_cleanup();
+       if (result) {
+               printk("TuxOnIce: Failed to cleanup after reading the image "
+                               "header.\n");
+               goto out_reset_console;
+       }
+
+       toi_cond_pause(1, "About to read pagedir.");
+
+       /*
+        * Get the addresses of pages into which we will load the kernel to
+        * be copied back
+        */
+       if (toi_get_pageset1_load_addresses()) {
+               printk(KERN_INFO "TuxOnIce: Failed to get load addresses for "
+                               "pageset1.\n");
+               goto out_reset_console;
+       }
+
+       /* Read the original kernel back */
+       toi_cond_pause(1, "About to read pageset 1.");
+
+       if (read_pageset(&pagedir1, 0)) {
+               toi_prepare_status(CLEAR_BAR, "Failed to read pageset 1.");
+               result = -EIO;
+               printk(KERN_INFO "TuxOnIce: Failed to get load pageset1.\n");
+               goto out_reset_console;
+       }
+
+       toi_cond_pause(1, "About to restore original kernel.");
+       result = 0;
+
+       if (!test_action_state(TOI_KEEP_IMAGE) &&
+           toiActiveAllocator->mark_resume_attempted)
+               toiActiveAllocator->mark_resume_attempted(1);
+
+out:
+       toi_free_page(25, (unsigned long) header_buffer);
+       return result;
+
+out_reset_console:
+       toi_cleanup_console();
+
+out_remove_image:
+       free_dyn_pageflags(&pageset1_map);
+       free_dyn_pageflags(&pageset1_copy_map);
+       free_dyn_pageflags(&io_map);
+       result = -EINVAL;
+       if (!test_action_state(TOI_KEEP_IMAGE))
+               toiActiveAllocator->remove_image();
+       toiActiveAllocator->read_header_cleanup();
+       noresume_reset_modules();
+       goto out;
+}
+
+/* read_pageset1()
+ *
+ * Description:        Attempt to read the header and pageset1 of a hibernate image.
+ *             Handle the outcome, complaining where appropriate.
+ */
+
+int read_pageset1(void)
+{
+       int error;
+
+       error = __read_pageset1();
+
+       if (error && error != -ENODATA && error != -EINVAL &&
+                                       !test_result_state(TOI_ABORTED))
+               abort_hibernate(TOI_IMAGE_ERROR,
+                       "TuxOnIce: Error %d resuming\n", error);
+
+       return error;
+}
+
+/*
+ * get_have_image_data()
+ */
+static char *get_have_image_data(void)
+{
+       char *output_buffer = (char *) toi_get_zeroed_page(26, TOI_ATOMIC_GFP);
+       struct toi_header *toi_header;
+
+       if (!output_buffer) {
+               printk(KERN_INFO "Output buffer null.\n");
+               return NULL;
+       }
+
+       /* Check for an image */
+       if (!toiActiveAllocator->image_exists(1) ||
+           toiActiveAllocator->read_header_init() ||
+           toiActiveAllocator->rw_header_chunk(READ, NULL,
+                       output_buffer, sizeof(struct toi_header))) {
+               sprintf(output_buffer, "0\n");
+               /*
+                * From an initrd/ramfs, catting have_image and
+                * getting a result of 0 is sufficient.
+                */
+               clear_toi_state(TOI_BOOT_TIME);
+               goto out;
+       }
+
+       toi_header = (struct toi_header *) output_buffer;
+
+       sprintf(output_buffer, "1\n%s\n%s\n",
+                       toi_header->uts.machine,
+                       toi_header->uts.version);
+
+       /* Check whether we've resumed before */
+       if (test_toi_state(TOI_RESUMED_BEFORE))
+               strcat(output_buffer, "Resumed before.\n");
+
+out:
+       noresume_reset_modules();
+       return output_buffer;
+}
+
+/* read_pageset2()
+ *
+ * Description:        Read in part or all of pageset2 of an image, depending upon
+ *             whether we are hibernating and have only overwritten a portion
+ *             with pageset1 pages, or are resuming and need to read them
+ *             all.
+ * Arguments:  Int. Boolean. Read only pages which would have been
+ *             overwritten by pageset1?
+ * Returns:    Int. Zero if no error, otherwise the error value.
+ */
+int read_pageset2(int overwrittenpagesonly)
+{
+       int result = 0;
+
+       if (!pagedir2.size)
+               return 0;
+
+       result = read_pageset(&pagedir2, overwrittenpagesonly);
+
+       toi_update_status(100, 100, NULL);
+       toi_cond_pause(1, "Pagedir 2 read.");
+
+       return result;
+}
+
+/* image_exists_read
+ *
+ * Return 0 or 1, depending on whether an image is found.
+ * Incoming buffer is PAGE_SIZE and result is guaranteed
+ * to be far less than that, so we don't worry about
+ * overflow.
+ */
+int image_exists_read(const char *page, int count)
+{
+       int len = 0;
+       char *result;
+
+       if (toi_activate_storage(0))
+               return count;
+
+       if (!test_toi_state(TOI_RESUME_DEVICE_OK))
+               toi_attempt_to_parse_resume_device(0);
+
+       if (!toiActiveAllocator) {
+               len = sprintf((char *) page, "-1\n");
+       } else {
+               result = get_have_image_data();
+               if (result) {
+                       len = sprintf((char *) page, "%s",  result);
+                       toi_free_page(26, (unsigned long) result);
+               }
+       }
+
+       toi_deactivate_storage(0);
+
+       return len;
+}
+
+/* image_exists_write
+ *
+ * Invalidate an image if one exists.
+ */
+int image_exists_write(const char *buffer, int count)
+{
+       if (toi_activate_storage(0))
+               return count;
+
+       if (toiActiveAllocator && toiActiveAllocator->image_exists(1))
+               toiActiveAllocator->remove_image();
+
+       toi_deactivate_storage(0);
+
+       clear_result_state(TOI_KEPT_IMAGE);
+
+       return count;
+}
+
+#ifdef CONFIG_TOI_EXPORTS
+EXPORT_SYMBOL_GPL(toi_attempt_to_parse_resume_device);
+EXPORT_SYMBOL_GPL(attempt_to_parse_resume_device2);
+EXPORT_SYMBOL_GPL(toi_io_workers);
+EXPORT_SYMBOL_GPL(toi_io_queue_flusher);
+EXPORT_SYMBOL_GPL(toi_bio_queue_flusher_should_finish);
+#endif
+
diff --git a/kernel/power/tuxonice_io.h b/kernel/power/tuxonice_io.h
new file mode 100644
index 0000000..d4b470b
--- /dev/null
+++ b/kernel/power/tuxonice_io.h
@@ -0,0 +1,71 @@
+/*
+ * kernel/power/tuxonice_io.h
+ *
+ * Copyright (C) 2005-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It contains high level IO routines for hibernating.
+ *
+ */
+
+#include <linux/utsname.h>
+#include "tuxonice_pagedir.h"
+#include "power.h"
+
+/* Non-module data saved in our image header */
+struct toi_header {
+       /*
+        * Mirror struct swsusp_info, but without
+        * the page aligned attribute
+        */
+       struct new_utsname uts;
+       u32 version_code;
+       unsigned long num_physpages;
+       int cpus;
+       unsigned long image_pages;
+       unsigned long pages;
+       unsigned long size;
+
+       /* Our own data */
+       unsigned long orig_mem_free;
+       int page_size;
+       int pageset_2_size;
+       int param0;
+       int param1;
+       int param2;
+       int param3;
+       int progress0;
+       int progress1;
+       int progress2;
+       int progress3;
+       int io_time[2][2];
+       struct pagedir pagedir;
+       dev_t root_fs;
+       unsigned long bkd; /* Boot kernel data locn */
+};
+
+extern int write_pageset(struct pagedir *pagedir);
+extern int write_image_header(void);
+extern int read_pageset1(void);
+extern int read_pageset2(int overwrittenpagesonly);
+
+extern int toi_attempt_to_parse_resume_device(int quiet);
+extern void attempt_to_parse_resume_device2(void);
+extern void attempt_to_parse_alt_resume_param(void);
+int image_exists_read(const char *page, int count);
+int image_exists_write(const char *buffer, int count);
+extern void save_restore_alt_param(int replace, int quiet);
+extern atomic_t toi_io_workers;
+
+/* Args to save_restore_alt_param */
+#define RESTORE 0
+#define SAVE 1
+
+#define NOQUIET 0
+#define QUIET 1
+
+extern dev_t name_to_dev_t(char *line);
+
+extern wait_queue_head_t toi_io_queue_flusher;
+extern int toi_bio_queue_flusher_should_finish;
diff --git a/kernel/power/tuxonice_modules.c b/kernel/power/tuxonice_modules.c
new file mode 100644
index 0000000..dcc7045
--- /dev/null
+++ b/kernel/power/tuxonice_modules.c
@@ -0,0 +1,465 @@
+/*
+ * kernel/power/tuxonice_modules.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include "tuxonice.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_ui.h"
+
+LIST_HEAD(toi_filters);
+LIST_HEAD(toiAllocators);
+LIST_HEAD(toi_modules);
+
+struct toi_module_ops *toiActiveAllocator;
+int toi_num_filters;
+int toiNumAllocators, toi_num_modules;
+
+/*
+ * toi_header_storage_for_modules
+ *
+ * Returns the amount of space needed to store configuration
+ * data needed by the modules prior to copying back the original
+ * kernel. We can exclude data for pageset2 because it will be
+ * available anyway once the kernel is copied back.
+ */
+long toi_header_storage_for_modules(void)
+{
+       struct toi_module_ops *this_module;
+       int bytes = 0;
+
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               if (!this_module->enabled ||
+                   (this_module->type == WRITER_MODULE &&
+                    toiActiveAllocator != this_module))
+                       continue;
+               if (this_module->storage_needed) {
+                       int this = this_module->storage_needed() +
+                               sizeof(struct toi_module_header) +
+                               sizeof(int);
+                       this_module->header_requested = this;
+                       bytes += this;
+               }
+       }
+
+       /* One more for the empty terminator */
+       return bytes + sizeof(struct toi_module_header);
+}
+
+/*
+ * toi_memory_for_modules
+ *
+ * Returns the amount of memory requested by modules for
+ * doing their work during the cycle.
+ */
+
+long toi_memory_for_modules(int print_parts)
+{
+       long bytes = 0, result;
+       struct toi_module_ops *this_module;
+
+       if (print_parts)
+               printk(KERN_INFO "Memory for modules:\n===================\n");
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               int this;
+               if (!this_module->enabled)
+                       continue;
+               if (this_module->memory_needed) {
+                       this = this_module->memory_needed();
+                       if (print_parts)
+                               printk(KERN_INFO "%10d bytes (%5ld pages) for "
+                                               "module '%s'.\n", this,
+                                               DIV_ROUND_UP(this, PAGE_SIZE),
+                                               this_module->name);
+                       bytes += this;
+               }
+       }
+
+       result = DIV_ROUND_UP(bytes, PAGE_SIZE);
+       if (print_parts)
+               printk(KERN_INFO " => %ld bytes, %ld pages.\n", bytes, result);
+
+       return result;
+}
+
+/*
+ * toi_expected_compression_ratio
+ *
+ * Returns the compression ratio expected when saving the image.
+ */
+
+int toi_expected_compression_ratio(void)
+{
+       int ratio = 100;
+       struct toi_module_ops *this_module;
+
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               if (!this_module->enabled)
+                       continue;
+               if (this_module->expected_compression)
+                       ratio = ratio * this_module->expected_compression()
+                               / 100;
+       }
+
+       return ratio;
+}
+
+/* toi_find_module_given_dir
+ * Functionality :     Return a module (if found), given a pointer
+ *                     to its directory name
+ */
+
+static struct toi_module_ops *toi_find_module_given_dir(char *name)
+{
+       struct toi_module_ops *this_module, *found_module = NULL;
+
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               if (!strcmp(name, this_module->directory)) {
+                       found_module = this_module;
+                       break;
+               }
+       }
+
+       return found_module;
+}
+
+/* toi_find_module_given_name
+ * Functionality :     Return a module (if found), given a pointer
+ *                     to its name
+ */
+
+struct toi_module_ops *toi_find_module_given_name(char *name)
+{
+       struct toi_module_ops *this_module, *found_module = NULL;
+
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               if (!strcmp(name, this_module->name)) {
+                       found_module = this_module;
+                       break;
+               }
+       }
+
+       return found_module;
+}
+
+/*
+ * toi_print_module_debug_info
+ * Functionality   : Get debugging info from modules into a buffer.
+ */
+int toi_print_module_debug_info(char *buffer, int buffer_size)
+{
+       struct toi_module_ops *this_module;
+       int len = 0;
+
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               if (!this_module->enabled)
+                       continue;
+               if (this_module->print_debug_info) {
+                       int result;
+                       result = this_module->print_debug_info(buffer + len,
+                                       buffer_size - len);
+                       len += result;
+               }
+       }
+
+       /* Ensure null terminated */
+       buffer[buffer_size] = 0;
+
+       return len;
+}
+
+/*
+ * toi_register_module
+ *
+ * Register a module.
+ */
+int toi_register_module(struct toi_module_ops *module)
+{
+       int i;
+       struct kobject *kobj;
+
+       module->enabled = 1;
+
+       if (toi_find_module_given_name(module->name)) {
+               printk(KERN_INFO "TuxOnIce: Trying to load module %s,"
+                               " which is already registered.\n",
+                               module->name);
+               return -EBUSY;
+       }
+
+       switch (module->type) {
+       case FILTER_MODULE:
+               list_add_tail(&module->type_list, &toi_filters);
+               toi_num_filters++;
+               break;
+       case WRITER_MODULE:
+               list_add_tail(&module->type_list, &toiAllocators);
+               toiNumAllocators++;
+               break;
+       case MISC_MODULE:
+       case MISC_HIDDEN_MODULE:
+               break;
+       default:
+               printk("Hmmm. Module '%s' has an invalid type."
+                       " It has been ignored.\n", module->name);
+               return -EINVAL;
+       }
+       list_add_tail(&module->module_list, &toi_modules);
+       toi_num_modules++;
+
+       if (!module->directory && !module->shared_directory)
+               return 0;
+
+       /*
+        * Modules may share a directory, but those with shared_dir
+        * set must be loaded (via symbol dependencies) after parents
+        * and unloaded beforehand.
+        */
+       if (module->shared_directory) {
+               struct toi_module_ops *shared =
+                       toi_find_module_given_dir(module->shared_directory);
+               if (!shared) {
+                       printk("TuxOnIce: Module %s wants to share %s's "
+                                       "directory but %s isn't loaded.\n",
+                                       module->name, module->shared_directory,
+                                       module->shared_directory);
+                       toi_unregister_module(module);
+                       return -ENODEV;
+               }
+               kobj = shared->dir_kobj;
+       } else {
+               if (!strncmp(module->directory, "[ROOT]", 6))
+                       kobj = tuxonice_kobj;
+               else
+                       kobj = make_toi_sysdir(module->directory);
+       }
+       module->dir_kobj = kobj;
+       for (i = 0; i < module->num_sysfs_entries; i++) {
+               int result = toi_register_sysfs_file(kobj,
+                               &module->sysfs_data[i]);
+               if (result)
+                       return result;
+       }
+       return 0;
+}
+
+/*
+ * toi_unregister_module
+ *
+ * Remove a module.
+ */
+void toi_unregister_module(struct toi_module_ops *module)
+{
+       int i;
+
+       if (module->dir_kobj)
+               for (i = 0; i < module->num_sysfs_entries; i++)
+                       toi_unregister_sysfs_file(module->dir_kobj,
+                                       &module->sysfs_data[i]);
+
+       if (!module->shared_directory && module->directory &&
+                       strncmp(module->directory, "[ROOT]", 6))
+               remove_toi_sysdir(module->dir_kobj);
+
+       switch (module->type) {
+       case FILTER_MODULE:
+               list_del(&module->type_list);
+               toi_num_filters--;
+               break;
+       case WRITER_MODULE:
+               list_del(&module->type_list);
+               toiNumAllocators--;
+               if (toiActiveAllocator == module) {
+                       toiActiveAllocator = NULL;
+                       clear_toi_state(TOI_CAN_RESUME);
+                       clear_toi_state(TOI_CAN_HIBERNATE);
+               }
+               break;
+       case MISC_MODULE:
+       case MISC_HIDDEN_MODULE:
+               break;
+       default:
+               printk("Hmmm. Module '%s' has an invalid type."
+                       " It has been ignored.\n", module->name);
+               return;
+       }
+       list_del(&module->module_list);
+       toi_num_modules--;
+}
+
+/*
+ * toi_move_module_tail
+ *
+ * Rearrange modules when reloading the config.
+ */
+void toi_move_module_tail(struct toi_module_ops *module)
+{
+       switch (module->type) {
+       case FILTER_MODULE:
+               if (toi_num_filters > 1)
+                       list_move_tail(&module->type_list, &toi_filters);
+               break;
+       case WRITER_MODULE:
+               if (toiNumAllocators > 1)
+                       list_move_tail(&module->type_list, &toiAllocators);
+               break;
+       case MISC_MODULE:
+       case MISC_HIDDEN_MODULE:
+               break;
+       default:
+               printk("Hmmm. Module '%s' has an invalid type."
+                       " It has been ignored.\n", module->name);
+               return;
+       }
+       if ((toi_num_filters + toiNumAllocators) > 1)
+               list_move_tail(&module->module_list, &toi_modules);
+}
+
+/*
+ * toi_initialise_modules
+ *
+ * Get ready to do some work!
+ */
+int toi_initialise_modules(int starting_cycle, int early)
+{
+       struct toi_module_ops *this_module;
+       int result;
+
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               this_module->header_requested = 0;
+               this_module->header_used = 0;
+               if (!this_module->enabled)
+                       continue;
+               if (this_module->early != early)
+                       continue;
+               if (this_module->initialise) {
+                       toi_message(TOI_MEMORY, TOI_MEDIUM, 1,
+                               "Initialising module %s.\n",
+                               this_module->name);
+                       result = this_module->initialise(starting_cycle);
+                       if (result) {
+                               toi_cleanup_modules(starting_cycle);
+                               return result;
+                       }
+                       this_module->initialised = 1;
+               }
+       }
+
+       return 0;
+}
+
+/*
+ * toi_cleanup_modules
+ *
+ * Tell modules the work is done.
+ */
+void toi_cleanup_modules(int finishing_cycle)
+{
+       struct toi_module_ops *this_module;
+
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               if (!this_module->enabled || !this_module->initialised)
+                       continue;
+               if (this_module->cleanup) {
+                       toi_message(TOI_MEMORY, TOI_MEDIUM, 1,
+                               "Cleaning up module %s.\n",
+                               this_module->name);
+                       this_module->cleanup(finishing_cycle);
+               }
+               this_module->initialised = 0;
+       }
+}
+
+/*
+ * toi_get_next_filter
+ *
+ * Get the next filter in the pipeline.
+ */
+struct toi_module_ops *toi_get_next_filter(struct toi_module_ops *filter_sought)
+{
+       struct toi_module_ops *last_filter = NULL, *this_filter = NULL;
+
+       list_for_each_entry(this_filter, &toi_filters, type_list) {
+               if (!this_filter->enabled)
+                       continue;
+               if ((last_filter == filter_sought) || (!filter_sought))
+                       return this_filter;
+               last_filter = this_filter;
+       }
+
+       return toiActiveAllocator;
+}
+
+/**
+ * toi_show_modules: Printk what support is loaded.
+ */
+void toi_print_modules(void)
+{
+       struct toi_module_ops *this_module;
+       int prev = 0;
+
+       printk("TuxOnIce " TOI_CORE_VERSION ", with support for");
+
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               if (this_module->type == MISC_HIDDEN_MODULE)
+                       continue;
+               printk("%s %s%s%s", prev ? "," : "",
+                               this_module->enabled ? "" : "[",
+                               this_module->name,
+                               this_module->enabled ? "" : "]");
+               prev = 1;
+       }
+
+       printk(".\n");
+}
+
+/* toi_get_modules
+ *
+ * Take a reference to modules so they can't go away under us.
+ */
+
+int toi_get_modules(void)
+{
+       struct toi_module_ops *this_module;
+
+       list_for_each_entry(this_module, &toi_modules, module_list) {
+               struct toi_module_ops *this_module2;
+
+               if (try_module_get(this_module->module))
+                       continue;
+
+               /* Failed! Reverse gets and return error */
+               list_for_each_entry(this_module2, &toi_modules,
+                               module_list) {
+                       if (this_module == this_module2)
+                               return -EINVAL;
+                       module_put(this_module2->module);
+               }
+       }
+       return 0;
+}
+
+/* toi_put_modules
+ *
+ * Release our references to modules we used.
+ */
+
+void toi_put_modules(void)
+{
+       struct toi_module_ops *this_module;
+
+       list_for_each_entry(this_module, &toi_modules, module_list)
+               module_put(this_module->module);
+}
+
+#ifdef CONFIG_TOI_EXPORTS
+EXPORT_SYMBOL_GPL(toi_register_module);
+EXPORT_SYMBOL_GPL(toi_unregister_module);
+EXPORT_SYMBOL_GPL(toi_get_next_filter);
+EXPORT_SYMBOL_GPL(toiActiveAllocator);
+#endif
diff --git a/kernel/power/tuxonice_modules.h b/kernel/power/tuxonice_modules.h
new file mode 100644
index 0000000..6d9ea6b
--- /dev/null
+++ b/kernel/power/tuxonice_modules.h
@@ -0,0 +1,176 @@
+/*
+ * kernel/power/tuxonice_modules.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It contains declarations for modules. Modules are additions to
+ * TuxOnIce that provide facilities such as image compression or
+ * encryption, backends for storage of the image and user interfaces.
+ *
+ */
+
+#ifndef TOI_MODULES_H
+#define TOI_MODULES_H
+
+/* This is the maximum size we store in the image header for a module name */
+#define TOI_MAX_MODULE_NAME_LENGTH 30
+
+/* Per-module metadata */
+struct toi_module_header {
+       char name[TOI_MAX_MODULE_NAME_LENGTH];
+       int enabled;
+       int type;
+       int index;
+       int data_length;
+       unsigned long signature;
+};
+
+enum {
+       FILTER_MODULE,
+       WRITER_MODULE,
+       MISC_MODULE, /* Block writer, eg. */
+       MISC_HIDDEN_MODULE,
+};
+
+enum {
+       TOI_ASYNC,
+       TOI_SYNC
+};
+
+struct toi_module_ops {
+       /* Functions common to all modules */
+       int type;
+       char *name;
+       char *directory;
+       char *shared_directory;
+       struct kobject *dir_kobj;
+       struct module *module;
+       int enabled, early, initialised;
+       struct list_head module_list;
+
+       /* List of filters or allocators */
+       struct list_head list, type_list;
+
+       /*
+        * Requirements for memory and storage in
+        * the image header..
+        */
+       int (*memory_needed) (void);
+       int (*storage_needed) (void);
+
+       int header_requested, header_used;
+
+       int (*expected_compression) (void);
+
+       /*
+        * Debug info
+        */
+       int (*print_debug_info) (char *buffer, int size);
+       int (*save_config_info) (char *buffer);
+       void (*load_config_info) (char *buffer, int len);
+
+       /*
+        * Initialise & cleanup - general routines called
+        * at the start and end of a cycle.
+        */
+       int (*initialise) (int starting_cycle);
+       void (*cleanup) (int finishing_cycle);
+
+       /*
+        * Calls for allocating storage (allocators only).
+        *
+        * Header space is allocated separately. Note that allocation
+        * of space for the header might result in allocated space
+        * being stolen from the main pool if there is no unallocated
+        * space. We have to be able to allocate enough space for
+        * the header. We can eat memory to ensure there is enough
+        * for the main pool.
+        */
+
+       int (*storage_available) (void);
+       void (*reserve_header_space) (int space_requested);
+       int (*allocate_storage) (int space_requested);
+       int (*storage_allocated) (void);
+       int (*release_storage) (void);
+
+       /*
+        * Routines used in image I/O.
+        */
+       int (*rw_init) (int rw, int stream_number);
+       int (*rw_cleanup) (int rw);
+       int (*write_page) (unsigned long index, struct page *buffer_page,
+                       unsigned int buf_size);
+       int (*read_page) (unsigned long *index, struct page *buffer_page,
+                       unsigned int *buf_size);
+       void (*io_flusher) (int rw);
+
+       /* Reset module if image exists but reading aborted */
+       void (*noresume_reset) (void);
+
+       /* Read and write the metadata */
+       int (*write_header_init) (void);
+       int (*write_header_cleanup) (void);
+
+       int (*read_header_init) (void);
+       int (*read_header_cleanup) (void);
+
+       int (*rw_header_chunk) (int rw, struct toi_module_ops *owner,
+                       char *buffer_start, int buffer_size);
+
+       int (*rw_header_chunk_noreadahead) (int rw,
+                       struct toi_module_ops *owner, char *buffer_start,
+                       int buffer_size);
+
+       /* Attempt to parse an image location */
+       int (*parse_sig_location) (char *buffer, int only_writer, int quiet);
+
+       /* Determine whether image exists that we can restore */
+       int (*image_exists) (int quiet);
+
+       /* Mark the image as having tried to resume */
+       int (*mark_resume_attempted) (int);
+
+       /* Destroy image if one exists */
+       int (*remove_image) (void);
+
+       /* Sysfs Data */
+       struct toi_sysfs_data *sysfs_data;
+       int num_sysfs_entries;
+};
+
+extern int toi_num_modules, toiNumAllocators;
+
+extern struct toi_module_ops *toiActiveAllocator;
+extern struct list_head toi_filters, toiAllocators, toi_modules;
+
+extern void toi_prepare_console_modules(void);
+extern void toi_cleanup_console_modules(void);
+
+extern struct toi_module_ops *toi_find_module_given_name(char *name);
+extern struct toi_module_ops *toi_get_next_filter(struct toi_module_ops *);
+
+extern int toi_register_module(struct toi_module_ops *module);
+extern void toi_move_module_tail(struct toi_module_ops *module);
+
+extern long toi_header_storage_for_modules(void);
+extern long toi_memory_for_modules(int print_parts);
+extern int toi_expected_compression_ratio(void);
+
+extern int toi_print_module_debug_info(char *buffer, int buffer_size);
+extern int toi_register_module(struct toi_module_ops *module);
+extern void toi_unregister_module(struct toi_module_ops *module);
+
+extern int toi_initialise_modules(int starting_cycle, int early);
+#define toi_initialise_modules_early(starting) \
+       toi_initialise_modules(starting, 1)
+#define toi_initialise_modules_late(starting) \
+       toi_initialise_modules(starting, 0)
+extern void toi_cleanup_modules(int finishing_cycle);
+
+extern void toi_print_modules(void);
+
+int toi_get_modules(void);
+void toi_put_modules(void);
+#endif
diff --git a/kernel/power/tuxonice_netlink.c b/kernel/power/tuxonice_netlink.c
new file mode 100644
index 0000000..fd9e9c1
--- /dev/null
+++ b/kernel/power/tuxonice_netlink.c
@@ -0,0 +1,327 @@
+/*
+ * kernel/power/tuxonice_netlink.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Functions for communicating with a userspace helper via netlink.
+ */
+
+
+#include <linux/suspend.h>
+#include "tuxonice_netlink.h"
+#include "tuxonice.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_alloc.h"
+
+struct user_helper_data *uhd_list;
+
+/*
+ * Refill our pool of SKBs for use in emergencies (eg, when eating memory and
+ * none can be allocated).
+ */
+static void toi_fill_skb_pool(struct user_helper_data *uhd)
+{
+       while (uhd->pool_level < uhd->pool_limit) {
+               struct sk_buff *new_skb =
+                       alloc_skb(NLMSG_SPACE(uhd->skb_size), TOI_ATOMIC_GFP);
+
+               if (!new_skb)
+                       break;
+
+               new_skb->next = uhd->emerg_skbs;
+               uhd->emerg_skbs = new_skb;
+               uhd->pool_level++;
+       }
+}
+
+/*
+ * Try to allocate a single skb. If we can't get one, try to use one from
+ * our pool.
+ */
+static struct sk_buff *toi_get_skb(struct user_helper_data *uhd)
+{
+       struct sk_buff *skb =
+               alloc_skb(NLMSG_SPACE(uhd->skb_size), TOI_ATOMIC_GFP);
+
+       if (skb)
+               return skb;
+
+       skb = uhd->emerg_skbs;
+       if (skb) {
+               uhd->pool_level--;
+               uhd->emerg_skbs = skb->next;
+               skb->next = NULL;
+       }
+
+       return skb;
+}
+
+static void put_skb(struct user_helper_data *uhd, struct sk_buff *skb)
+{
+       if (uhd->pool_level < uhd->pool_limit) {
+               skb->next = uhd->emerg_skbs;
+               uhd->emerg_skbs = skb;
+       } else
+               kfree_skb(skb);
+}
+
+void toi_send_netlink_message(struct user_helper_data *uhd,
+               int type, void *params, size_t len)
+{
+       struct sk_buff *skb;
+       struct nlmsghdr *nlh;
+       void *dest;
+       struct task_struct *t;
+
+       if (uhd->pid == -1)
+               return;
+
+       skb = toi_get_skb(uhd);
+       if (!skb) {
+               printk(KERN_INFO "toi_netlink: Can't allocate skb!\n");
+               return;
+       }
+
+       /* NLMSG_PUT contains a hidden goto nlmsg_failure */
+       nlh = NLMSG_PUT(skb, 0, uhd->sock_seq, type, len);
+       uhd->sock_seq++;
+
+       dest = NLMSG_DATA(nlh);
+       if (params && len > 0)
+               memcpy(dest, params, len);
+
+       netlink_unicast(uhd->nl, skb, uhd->pid, 0);
+
+       read_lock(&tasklist_lock);
+       t = find_task_by_pid_type_ns(PIDTYPE_PID, uhd->pid, &init_pid_ns);
+       if (!t) {
+               read_unlock(&tasklist_lock);
+               if (uhd->pid > -1)
+                       printk(KERN_INFO "Hmm. Can't find the userspace task"
+                               " %d.\n", uhd->pid);
+               return;
+       }
+       wake_up_process(t);
+       read_unlock(&tasklist_lock);
+
+       yield();
+
+       return;
+
+nlmsg_failure:
+       if (skb)
+               put_skb(uhd, skb);
+}
+EXPORT_SYMBOL_GPL(toi_send_netlink_message);
+
+static void send_whether_debugging(struct user_helper_data *uhd)
+{
+       static int is_debugging = 1;
+
+       toi_send_netlink_message(uhd, NETLINK_MSG_IS_DEBUGGING,
+                       &is_debugging, sizeof(int));
+}
+
+/*
+ * Set the PF_NOFREEZE flag on the given process to ensure it can run whilst we
+ * are hibernating.
+ */
+static int nl_set_nofreeze(struct user_helper_data *uhd, int pid)
+{
+       struct task_struct *t;
+
+       read_lock(&tasklist_lock);
+       t = find_task_by_pid_type_ns(PIDTYPE_PID, pid, &init_pid_ns);
+       if (!t) {
+               read_unlock(&tasklist_lock);
+               printk(KERN_INFO "Strange. Can't find the userspace task %d.\n",
+                               pid);
+               return -EINVAL;
+       }
+
+       t->flags |= PF_NOFREEZE;
+
+       read_unlock(&tasklist_lock);
+       uhd->pid = pid;
+
+       toi_send_netlink_message(uhd, NETLINK_MSG_NOFREEZE_ACK, NULL, 0);
+
+       return 0;
+}
+
+/*
+ * Called when the userspace process has informed us that it's ready to roll.
+ */
+static int nl_ready(struct user_helper_data *uhd, int version)
+{
+       if (version != uhd->interface_version) {
+               printk(KERN_INFO "%s userspace process using invalid interface"
+                               " version. Trying to continue without it.\n",
+                               uhd->name);
+               if (uhd->not_ready)
+                       uhd->not_ready();
+               return -EINVAL;
+       }
+
+       complete(&uhd->wait_for_process);
+
+       return 0;
+}
+
+void toi_netlink_close_complete(struct user_helper_data *uhd)
+{
+       if (uhd->nl) {
+               sock_release(uhd->nl->sk_socket);
+               uhd->nl = NULL;
+       }
+
+       while (uhd->emerg_skbs) {
+               struct sk_buff *next = uhd->emerg_skbs->next;
+               kfree_skb(uhd->emerg_skbs);
+               uhd->emerg_skbs = next;
+       }
+
+       uhd->pid = -1;
+}
+EXPORT_SYMBOL_GPL(toi_netlink_close_complete);
+
+static int toi_nl_gen_rcv_msg(struct user_helper_data *uhd,
+               struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+       int type;
+       int *data;
+       int err;
+
+       /* Let the more specific handler go first. It returns
+        * 1 for valid messages that it doesn't know. */
+       err = uhd->rcv_msg(skb, nlh);
+       if (err != 1)
+               return err;
+
+       type = nlh->nlmsg_type;
+
+       /* Only allow one task to receive NOFREEZE privileges */
+       if (type == NETLINK_MSG_NOFREEZE_ME && uhd->pid != -1) {
+               printk("Received extra nofreeze me requests.\n");
+               return -EBUSY;
+       }
+
+       data = (int *)NLMSG_DATA(nlh);
+
+       switch (type) {
+       case NETLINK_MSG_NOFREEZE_ME:
+               return nl_set_nofreeze(uhd, nlh->nlmsg_pid);
+       case NETLINK_MSG_GET_DEBUGGING:
+               send_whether_debugging(uhd);
+               return 0;
+       case NETLINK_MSG_READY:
+               if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int))) {
+                       printk(KERN_INFO "Invalid ready mesage.\n");
+                       return -EINVAL;
+               }
+               return nl_ready(uhd, *data);
+       case NETLINK_MSG_CLEANUP:
+               toi_netlink_close_complete(uhd);
+               return 0;
+       }
+
+       return -EINVAL;
+}
+
+static void toi_user_rcv_skb(struct sk_buff *skb)
+{
+       int err;
+       struct nlmsghdr *nlh;
+       struct user_helper_data *uhd = uhd_list;
+
+       while (uhd && uhd->netlink_id != skb->sk->sk_protocol)
+               uhd = uhd->next;
+
+       if (!uhd)
+               return;
+
+       while (skb->len >= NLMSG_SPACE(0)) {
+               u32 rlen;
+
+               nlh = (struct nlmsghdr *) skb->data;
+               if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
+                       return;
+
+               rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+               if (rlen > skb->len)
+                       rlen = skb->len;
+
+               err = toi_nl_gen_rcv_msg(uhd, skb, nlh);
+               if (err)
+                       netlink_ack(skb, nlh, err);
+               else if (nlh->nlmsg_flags & NLM_F_ACK)
+                       netlink_ack(skb, nlh, 0);
+               skb_pull(skb, rlen);
+       }
+}
+
+static int netlink_prepare(struct user_helper_data *uhd)
+{
+       uhd->next = uhd_list;
+       uhd_list = uhd;
+
+       uhd->sock_seq = 0x42c0ffee;
+       uhd->nl = netlink_kernel_create(&init_net, uhd->netlink_id, 0,
+                       toi_user_rcv_skb, NULL, THIS_MODULE);
+       if (!uhd->nl) {
+               printk(KERN_INFO "Failed to allocate netlink socket for %s.\n",
+                               uhd->name);
+               return -ENOMEM;
+       }
+
+       toi_fill_skb_pool(uhd);
+
+       return 0;
+}
+
+void toi_netlink_close(struct user_helper_data *uhd)
+{
+       struct task_struct *t;
+
+       read_lock(&tasklist_lock);
+       t = find_task_by_pid_type_ns(PIDTYPE_PID, uhd->pid, &init_pid_ns);
+       if (t)
+               t->flags &= ~PF_NOFREEZE;
+       read_unlock(&tasklist_lock);
+
+       toi_send_netlink_message(uhd, NETLINK_MSG_CLEANUP, NULL, 0);
+}
+EXPORT_SYMBOL_GPL(toi_netlink_close);
+
+int toi_netlink_setup(struct user_helper_data *uhd)
+{
+       /* In case userui didn't cleanup properly on us */
+       toi_netlink_close_complete(uhd);
+
+       if (netlink_prepare(uhd) < 0) {
+               printk(KERN_INFO "Netlink prepare failed.\n");
+               return 1;
+       }
+
+       if (toi_launch_userspace_program(uhd->program, uhd->netlink_id,
+                               UMH_WAIT_EXEC) < 0) {
+               printk(KERN_INFO "Launch userspace program failed.\n");
+               toi_netlink_close_complete(uhd);
+               return 1;
+       }
+
+       /* Wait 2 seconds for the userspace process to make contact */
+       wait_for_completion_timeout(&uhd->wait_for_process, 2*HZ);
+
+       if (uhd->pid == -1) {
+               printk(KERN_INFO "%s: Failed to contact userspace process.\n",
+                               uhd->name);
+               toi_netlink_close_complete(uhd);
+               return 1;
+       }
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(toi_netlink_setup);
diff --git a/kernel/power/tuxonice_netlink.h b/kernel/power/tuxonice_netlink.h
new file mode 100644
index 0000000..1436ac3
--- /dev/null
+++ b/kernel/power/tuxonice_netlink.h
@@ -0,0 +1,61 @@
+/*
+ * kernel/power/tuxonice_netlink.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Declarations for functions for communicating with a userspace helper
+ * via netlink.
+ */
+
+#include <linux/netlink.h>
+#include <net/sock.h>
+
+#define NETLINK_MSG_BASE 0x10
+
+#define NETLINK_MSG_READY 0x10
+#define        NETLINK_MSG_NOFREEZE_ME 0x16
+#define NETLINK_MSG_GET_DEBUGGING 0x19
+#define NETLINK_MSG_CLEANUP 0x24
+#define NETLINK_MSG_NOFREEZE_ACK 0x27
+#define NETLINK_MSG_IS_DEBUGGING 0x28
+
+struct user_helper_data {
+       int (*rcv_msg) (struct sk_buff *skb, struct nlmsghdr *nlh);
+       void (*not_ready) (void);
+       struct sock *nl;
+       u32 sock_seq;
+       pid_t pid;
+       char *comm;
+       char program[256];
+       int pool_level;
+       int pool_limit;
+       struct sk_buff *emerg_skbs;
+       int skb_size;
+       int netlink_id;
+       char *name;
+       struct user_helper_data *next;
+       struct completion wait_for_process;
+       int interface_version;
+       int must_init;
+};
+
+#ifdef CONFIG_NET
+int toi_netlink_setup(struct user_helper_data *uhd);
+void toi_netlink_close(struct user_helper_data *uhd);
+void toi_send_netlink_message(struct user_helper_data *uhd,
+               int type, void *params, size_t len);
+void toi_netlink_close_complete(struct user_helper_data *uhd);
+#else
+static inline int toi_netlink_setup(struct user_helper_data *uhd)
+{
+       return 0;
+}
+
+static inline void toi_netlink_close(struct user_helper_data *uhd) { };
+static inline void toi_send_netlink_message(struct user_helper_data *uhd,
+               int type, void *params, size_t len) { };
+static inline void toi_netlink_close_complete(struct user_helper_data *uhd)
+       { };
+#endif
diff --git a/kernel/power/tuxonice_pagedir.c b/kernel/power/tuxonice_pagedir.c
new file mode 100644
index 0000000..93b65cd
--- /dev/null
+++ b/kernel/power/tuxonice_pagedir.c
@@ -0,0 +1,347 @@
+/*
+ * kernel/power/tuxonice_pagedir.c
+ *
+ * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
+ * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr>
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for handling pagesets.
+ * Note that pbes aren't actually stored as such. They're stored as
+ * bitmaps and extents.
+ */
+
+#include <linux/suspend.h>
+#include <linux/highmem.h>
+#include <linux/bootmem.h>
+#include <linux/hardirq.h>
+#include <linux/sched.h>
+#include <asm/tlbflush.h>
+
+#include "tuxonice_pageflags.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_pagedir.h"
+#include "tuxonice_prepare_image.h"
+#include "tuxonice.h"
+#include "power.h"
+#include "tuxonice_builtin.h"
+#include "tuxonice_alloc.h"
+
+static int ptoi_pfn;
+static struct pbe *this_low_pbe;
+static struct pbe **last_low_pbe_ptr;
+
+void toi_reset_alt_image_pageset2_pfn(void)
+{
+       ptoi_pfn = max_pfn + 1;
+}
+
+static struct page *first_conflicting_page;
+
+/*
+ * free_conflicting_pages
+ */
+
+void free_conflicting_pages(void)
+{
+       while (first_conflicting_page) {
+               struct page *next =
+                       *((struct page **) kmap(first_conflicting_page));
+               kunmap(first_conflicting_page);
+               toi__free_page(29, first_conflicting_page);
+               first_conflicting_page = next;
+       }
+}
+
+/* __toi_get_nonconflicting_page
+ *
+ * Description: Gets order zero pages that won't be overwritten
+ *             while copying the original pages.
+ */
+
+struct page *___toi_get_nonconflicting_page(int can_be_highmem)
+{
+       struct page *page;
+       int flags = TOI_ATOMIC_GFP;
+       if (can_be_highmem)
+               flags |= __GFP_HIGHMEM;
+
+
+       if (test_toi_state(TOI_LOADING_ALT_IMAGE) && pageset2_map.bitmap &&
+                               (ptoi_pfn < (max_pfn + 2))) {
+               /*
+                * ptoi_pfn = max_pfn + 1 when yet to find first ps2 pfn that
+                * can be used.
+                *         = 0..max_pfn when going through list.
+                *         = max_pfn + 2 when gone through whole list.
+                */
+               do {
+                       ptoi_pfn = get_next_bit_on(&pageset2_map, ptoi_pfn);
+                       if (ptoi_pfn <= max_pfn) {
+                               page = pfn_to_page(ptoi_pfn);
+                               if (!PagePageset1(page) &&
+                                   (can_be_highmem || !PageHighMem(page)))
+                                       return page;
+                       } else
+                               ptoi_pfn++;
+               } while (ptoi_pfn < max_pfn);
+       }
+
+       do {
+               page = toi_alloc_page(29, flags);
+               if (!page) {
+                       printk(KERN_INFO "Failed to get nonconflicting "
+                                       "page.\n");
+                       return 0;
+               }
+               if (PagePageset1(page)) {
+                       struct page **next = (struct page **) kmap(page);
+                       *next = first_conflicting_page;
+                       first_conflicting_page = page;
+                       kunmap(page);
+               }
+       } while (PagePageset1(page));
+
+       return page;
+}
+
+unsigned long __toi_get_nonconflicting_page(void)
+{
+       struct page *page = ___toi_get_nonconflicting_page(0);
+       return page ? (unsigned long) page_address(page) : 0;
+}
+
+struct pbe *get_next_pbe(struct page **page_ptr, struct pbe *this_pbe,
+               int highmem)
+{
+       if (((((unsigned long) this_pbe) & (PAGE_SIZE - 1))
+                    + 2 * sizeof(struct pbe)) > PAGE_SIZE) {
+               struct page *new_page =
+                       ___toi_get_nonconflicting_page(highmem);
+               if (!new_page)
+                       return ERR_PTR(-ENOMEM);
+               this_pbe = (struct pbe *) kmap(new_page);
+               memset(this_pbe, 0, PAGE_SIZE);
+               *page_ptr = new_page;
+       } else
+               this_pbe++;
+
+       return this_pbe;
+}
+
+/* get_pageset1_load_addresses
+ *
+ * Description: We check here that pagedir & pages it points to won't collide
+ *             with pages where we're going to restore from the loaded pages
+ *             later.
+ * Returns:    Zero on success, one if couldn't find enough pages (shouldn't
+ *             happen).
+ */
+
+int toi_get_pageset1_load_addresses(void)
+{
+       int pfn, highallocd = 0, lowallocd = 0;
+       int low_needed = pagedir1.size - get_highmem_size(pagedir1);
+       int high_needed = get_highmem_size(pagedir1);
+       int low_pages_for_highmem = 0;
+       unsigned long flags = GFP_ATOMIC | __GFP_NOWARN | __GFP_HIGHMEM;
+       struct page *page, *high_pbe_page = NULL, *last_high_pbe_page = NULL,
+                   *low_pbe_page;
+       struct pbe **last_high_pbe_ptr = &restore_highmem_pblist,
+                  *this_high_pbe = NULL;
+       int orig_low_pfn = max_pfn + 1, orig_high_pfn = max_pfn + 1;
+       int high_pbes_done = 0, low_pbes_done = 0;
+       int low_direct = 0, high_direct = 0;
+       int high_to_free, low_to_free;
+
+       last_low_pbe_ptr = &restore_pblist;
+
+       /* First, allocate pages for the start of our pbe lists. */
+       if (high_needed) {
+               high_pbe_page = ___toi_get_nonconflicting_page(1);
+               if (!high_pbe_page)
+                       return 1;
+               this_high_pbe = (struct pbe *) kmap(high_pbe_page);
+               memset(this_high_pbe, 0, PAGE_SIZE);
+       }
+
+       low_pbe_page = ___toi_get_nonconflicting_page(0);
+       if (!low_pbe_page)
+               return 1;
+       this_low_pbe = (struct pbe *) page_address(low_pbe_page);
+
+       /*
+        * Next, allocate all possible memory to find where we can
+        * load data directly into destination pages. I'd like to do
+        * this in bigger chunks, but then we can't free pages
+        * individually later.
+        */
+
+       do {
+               page = toi_alloc_page(30, flags);
+               if (page)
+                       SetPagePageset1Copy(page);
+       } while (page);
+
+       /*
+        * Find out how many high- and lowmem pages we allocated above,
+        * and how many pages we can reload directly to their original
+        * location.
+        */
+       BITMAP_FOR_EACH_SET(&pageset1_copy_map, pfn) {
+               int is_high;
+               page = pfn_to_page(pfn);
+               is_high = PageHighMem(page);
+
+               if (PagePageset1(page)) {
+                       if (test_action_state(TOI_NO_DIRECT_LOAD)) {
+                               ClearPagePageset1Copy(page);
+                               toi__free_page(30, page);
+                               continue;
+                       } else {
+                               if (is_high)
+                                       high_direct++;
+                               else
+                                       low_direct++;
+                       }
+               } else {
+                       if (is_high)
+                               highallocd++;
+                       else
+                               lowallocd++;
+               }
+       }
+
+       high_needed -= high_direct;
+       low_needed -= low_direct;
+
+       /*
+        * Do we need to use some lowmem pages for the copies of highmem
+        * pages?
+        */
+       if (high_needed > highallocd) {
+               low_pages_for_highmem = high_needed - highallocd;
+               high_needed -= low_pages_for_highmem;
+               low_needed += low_pages_for_highmem;
+       }
+
+       high_to_free = highallocd - high_needed;
+       low_to_free = lowallocd - low_needed;
+
+       /*
+        * Now generate our pbes (which will be used for the atomic restore,
+        * and free unneeded pages.
+        */
+       BITMAP_FOR_EACH_SET(&pageset1_copy_map, pfn) {
+               int is_high;
+               page = pfn_to_page(pfn);
+               is_high = PageHighMem(page);
+
+               if (PagePageset1(page))
+                       continue;
+
+               /* Free the page? */
+               if ((is_high && high_to_free) ||
+                   (!is_high && low_to_free)) {
+                       ClearPagePageset1Copy(page);
+                       toi__free_page(30, page);
+                       if (is_high)
+                               high_to_free--;
+                       else
+                               low_to_free--;
+                       continue;
+               }
+
+               /* Nope. We're going to use this page. Add a pbe. */
+               if (is_high || low_pages_for_highmem) {
+                       struct page *orig_page;
+                       high_pbes_done++;
+                       if (!is_high)
+                               low_pages_for_highmem--;
+                       do {
+                               orig_high_pfn = get_next_bit_on(&pageset1_map,
+                                               orig_high_pfn);
+                               BUG_ON(orig_high_pfn > max_pfn);
+                               orig_page = pfn_to_page(orig_high_pfn);
+                       } while (!PageHighMem(orig_page) ||
+                                       load_direct(orig_page));
+
+                       this_high_pbe->orig_address = orig_page;
+                       this_high_pbe->address = page;
+                       this_high_pbe->next = NULL;
+                       if (last_high_pbe_page != high_pbe_page) {
+                               *last_high_pbe_ptr =
+                                       (struct pbe *) high_pbe_page;
+                               if (!last_high_pbe_page)
+                                       last_high_pbe_page = high_pbe_page;
+                       } else
+                               *last_high_pbe_ptr = this_high_pbe;
+                       last_high_pbe_ptr = &this_high_pbe->next;
+                       if (last_high_pbe_page != high_pbe_page) {
+                               kunmap(last_high_pbe_page);
+                               last_high_pbe_page = high_pbe_page;
+                       }
+                       this_high_pbe = get_next_pbe(&high_pbe_page,
+                                       this_high_pbe, 1);
+                       if (IS_ERR(this_high_pbe)) {
+                               printk(KERN_INFO
+                                               "This high pbe is an error.\n");
+                               return -ENOMEM;
+                       }
+               } else {
+                       struct page *orig_page;
+                       low_pbes_done++;
+                       do {
+                               orig_low_pfn = get_next_bit_on(&pageset1_map,
+                                               orig_low_pfn);
+                               BUG_ON(orig_low_pfn > max_pfn);
+                               orig_page = pfn_to_page(orig_low_pfn);
+                       } while (PageHighMem(orig_page) ||
+                                       load_direct(orig_page));
+
+                       this_low_pbe->orig_address = page_address(orig_page);
+                       this_low_pbe->address = page_address(page);
+                       this_low_pbe->next = NULL;
+                       *last_low_pbe_ptr = this_low_pbe;
+                       last_low_pbe_ptr = &this_low_pbe->next;
+                       this_low_pbe = get_next_pbe(&low_pbe_page,
+                                       this_low_pbe, 0);
+                       if (IS_ERR(this_low_pbe)) {
+                               printk(KERN_INFO "this_low_pbe is an error.\n");
+                               return -ENOMEM;
+                       }
+               }
+       }
+
+       if (high_pbe_page)
+               kunmap(high_pbe_page);
+
+       if (last_high_pbe_page != high_pbe_page) {
+               if (last_high_pbe_page)
+                       kunmap(last_high_pbe_page);
+               toi__free_page(29, high_pbe_page);
+       }
+
+       free_conflicting_pages();
+
+       return 0;
+}
+
+int add_boot_kernel_data_pbe(void)
+{
+       this_low_pbe->address = (char *) __toi_get_nonconflicting_page();
+       if (!this_low_pbe->address) {
+               printk(KERN_INFO "Failed to get bkd atomic restore buffer.");
+               return -ENOMEM;
+       }
+
+       toi_bkd.size = sizeof(toi_bkd);
+       memcpy(this_low_pbe->address, &toi_bkd, sizeof(toi_bkd));
+
+       *last_low_pbe_ptr = this_low_pbe;
+       this_low_pbe->orig_address = (char *) boot_kernel_data_buffer;
+       this_low_pbe->next = NULL;
+       return 0;
+}
diff --git a/kernel/power/tuxonice_pagedir.h b/kernel/power/tuxonice_pagedir.h
new file mode 100644
index 0000000..081e744
--- /dev/null
+++ b/kernel/power/tuxonice_pagedir.h
@@ -0,0 +1,50 @@
+/*
+ * kernel/power/tuxonice_pagedir.h
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Declarations for routines for handling pagesets.
+ */
+
+#ifndef KERNEL_POWER_PAGEDIR_H
+#define KERNEL_POWER_PAGEDIR_H
+
+/* Pagedir
+ *
+ * Contains the metadata for a set of pages saved in the image.
+ */
+
+struct pagedir {
+       int id;
+       long size;
+#ifdef CONFIG_HIGHMEM
+       long size_high;
+#endif
+};
+
+#ifdef CONFIG_HIGHMEM
+#define get_highmem_size(pagedir) (pagedir.size_high)
+#define set_highmem_size(pagedir, sz) do { pagedir.size_high = sz; } while (0)
+#define inc_highmem_size(pagedir) do { pagedir.size_high++; } while (0)
+#define get_lowmem_size(pagedir) (pagedir.size - pagedir.size_high)
+#else
+#define get_highmem_size(pagedir) (0)
+#define set_highmem_size(pagedir, sz) do { } while (0)
+#define inc_highmem_size(pagedir) do { } while (0)
+#define get_lowmem_size(pagedir) (pagedir.size)
+#endif
+
+extern struct pagedir pagedir1, pagedir2;
+
+extern void toi_copy_pageset1(void);
+
+extern int toi_get_pageset1_load_addresses(void);
+
+extern unsigned long __toi_get_nonconflicting_page(void);
+struct page *___toi_get_nonconflicting_page(int can_be_highmem);
+
+extern void toi_reset_alt_image_pageset2_pfn(void);
+extern int add_boot_kernel_data_pbe(void);
+#endif
diff --git a/kernel/power/tuxonice_pageflags.c b/kernel/power/tuxonice_pageflags.c
new file mode 100644
index 0000000..574858c
--- /dev/null
+++ b/kernel/power/tuxonice_pageflags.c
@@ -0,0 +1,162 @@
+/*
+ * kernel/power/tuxonice_pageflags.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for serialising and relocating pageflags in which we
+ * store our image metadata.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/list.h>
+#include <linux/suspend.h>
+#include "tuxonice_pageflags.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_pagedir.h"
+#include "tuxonice.h"
+
+DECLARE_DYN_PAGEFLAGS(pageset2_map);
+DECLARE_DYN_PAGEFLAGS(page_resave_map);
+DECLARE_DYN_PAGEFLAGS(io_map);
+DECLARE_DYN_PAGEFLAGS(nosave_map);
+DECLARE_DYN_PAGEFLAGS(free_map);
+
+static int pages_for_zone(struct zone *zone)
+{
+       return DIV_ROUND_UP(zone->spanned_pages, (PAGE_SIZE << 3));
+}
+
+int toi_pageflags_space_needed(void)
+{
+       int total = 0;
+       struct zone *zone;
+
+       for_each_zone(zone)
+               if (populated_zone(zone))
+                       total += sizeof(int) * 3 + pages_for_zone(zone) *
+                               PAGE_SIZE;
+
+       total += sizeof(int);
+
+       return total;
+}
+
+/* save_dyn_pageflags
+ *
+ * Description: Save a set of pageflags.
+ * Arguments:   struct dyn_pageflags *: Pointer to the bitmap being saved.
+ */
+
+void save_dyn_pageflags(struct dyn_pageflags *pagemap)
+{
+       int i, zone_idx, size, node = 0;
+       struct zone *zone;
+       struct pglist_data *pgdat;
+
+       if (!pagemap)
+               return;
+
+       for_each_online_pgdat(pgdat) {
+               for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) {
+                       zone = &pgdat->node_zones[zone_idx];
+
+                       if (!populated_zone(zone))
+                               continue;
+
+                       toiActiveAllocator->rw_header_chunk(WRITE, NULL,
+                                       (char *) &node, sizeof(int));
+                       toiActiveAllocator->rw_header_chunk(WRITE, NULL,
+                                       (char *) &zone_idx, sizeof(int));
+                       size = pages_for_zone(zone);
+                       toiActiveAllocator->rw_header_chunk(WRITE, NULL,
+                                       (char *) &size, sizeof(int));
+
+                       for (i = 0; i < size; i++) {
+                               if (!pagemap->bitmap[node][zone_idx][i+2]) {
+                                       printk(KERN_INFO "Sparse pagemap?\n");
+                                       dump_pagemap(pagemap);
+                                       BUG();
+                               }
+                               toiActiveAllocator->rw_header_chunk(WRITE,
+                                       NULL, (char *) pagemap->bitmap[node]
+                                               [zone_idx][i+2],
+                                       PAGE_SIZE);
+                       }
+               }
+               node++;
+       }
+       node = -1;
+       toiActiveAllocator->rw_header_chunk(WRITE, NULL,
+                       (char *) &node, sizeof(int));
+}
+
+/* load_dyn_pageflags
+ *
+ * Description: Load a set of pageflags.
+ * Arguments:   struct dyn_pageflags *: Pointer to the bitmap being loaded.
+ *              (It must be allocated before calling this routine).
+ */
+
+int load_dyn_pageflags(struct dyn_pageflags *pagemap)
+{
+       int i, zone_idx, zone_check = 0, size, node = 0;
+       struct zone *zone;
+       struct pglist_data *pgdat;
+
+       if (!pagemap)
+               return 1;
+
+       for_each_online_pgdat(pgdat) {
+               for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) {
+                       zone = &pgdat->node_zones[zone_idx];
+
+                       if (!populated_zone(zone))
+                               continue;
+
+                       /* Same node? */
+                       toiActiveAllocator->rw_header_chunk(READ, NULL,
+                                       (char *) &zone_check, sizeof(int));
+                       if (zone_check != node) {
+                               printk(KERN_INFO "Node read (%d) != node "
+                                               "(%d).\n",
+                                               zone_check, node);
+                               return 1;
+                       }
+
+                       /* Same zone? */
+                       toiActiveAllocator->rw_header_chunk(READ, NULL,
+                                       (char *) &zone_check, sizeof(int));
+                       if (zone_check != zone_idx) {
+                               printk(KERN_INFO "Zone read (%d) != node "
+                                               "(%d).\n",
+                                               zone_check, zone_idx);
+                               return 1;
+                       }
+
+
+                       toiActiveAllocator->rw_header_chunk(READ, NULL,
+                               (char *) &size, sizeof(int));
+
+                       for (i = 0; i < size; i++)
+                               toiActiveAllocator->rw_header_chunk(READ, NULL,
+                                       (char *) pagemap->bitmap[node][zone_idx]
+                                                                       [i+2],
+                                       PAGE_SIZE);
+               }
+               node++;
+       }
+       toiActiveAllocator->rw_header_chunk(READ, NULL, (char *) &zone_check,
+                       sizeof(int));
+       if (zone_check != -1) {
+               printk(KERN_INFO "Didn't read end of dyn pageflag data marker."
+                               "(%x)\n", zone_check);
+               return 1;
+       }
+
+       return 0;
+}
diff --git a/kernel/power/tuxonice_pageflags.h b/kernel/power/tuxonice_pageflags.h
new file mode 100644
index 0000000..f976b5c
--- /dev/null
+++ b/kernel/power/tuxonice_pageflags.h
@@ -0,0 +1,63 @@
+/*
+ * kernel/power/tuxonice_pageflags.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * TuxOnIce needs a few pageflags while working that aren't otherwise
+ * used. To save the struct page pageflags, we dynamically allocate
+ * a bitmap and use that. These are the only non order-0 allocations
+ * we do.
+ *
+ * NOTE!!!
+ * We assume that PAGE_SIZE - sizeof(void *) is a multiple of
+ * sizeof(unsigned long). Is this ever false?
+ */
+
+#include <linux/dyn_pageflags.h>
+#include <linux/suspend.h>
+
+extern struct dyn_pageflags pageset1_map;
+extern struct dyn_pageflags pageset1_copy_map;
+extern struct dyn_pageflags pageset2_map;
+extern struct dyn_pageflags page_resave_map;
+extern struct dyn_pageflags io_map;
+extern struct dyn_pageflags nosave_map;
+extern struct dyn_pageflags free_map;
+
+#define PagePageset1(page) (test_dynpageflag(&pageset1_map, page))
+#define SetPagePageset1(page) (set_dynpageflag(&pageset1_map, page))
+#define ClearPagePageset1(page) (clear_dynpageflag(&pageset1_map, page))
+
+#define PagePageset1Copy(page) (test_dynpageflag(&pageset1_copy_map, page))
+#define SetPagePageset1Copy(page) (set_dynpageflag(&pageset1_copy_map, page))
+#define ClearPagePageset1Copy(page) \
+       (clear_dynpageflag(&pageset1_copy_map, page))
+
+#define PagePageset2(page) (test_dynpageflag(&pageset2_map, page))
+#define SetPagePageset2(page) (set_dynpageflag(&pageset2_map, page))
+#define ClearPagePageset2(page) (clear_dynpageflag(&pageset2_map, page))
+
+#define PageWasRW(page) (test_dynpageflag(&pageset2_map, page))
+#define SetPageWasRW(page) (set_dynpageflag(&pageset2_map, page))
+#define ClearPageWasRW(page) (clear_dynpageflag(&pageset2_map, page))
+
+#define PageResave(page) (page_resave_map.bitmap ? \
+       test_dynpageflag(&page_resave_map, page) : 0)
+#define SetPageResave(page) (set_dynpageflag(&page_resave_map, page))
+#define ClearPageResave(page) (clear_dynpageflag(&page_resave_map, page))
+
+#define PageNosave(page) (nosave_map.bitmap ? \
+               test_dynpageflag(&nosave_map, page) : 0)
+#define SetPageNosave(page) (set_dynpageflag(&nosave_map, page))
+#define ClearPageNosave(page) (clear_dynpageflag(&nosave_map, page))
+
+#define PageNosaveFree(page) (free_map.bitmap ? \
+               test_dynpageflag(&free_map, page) : 0)
+#define SetPageNosaveFree(page) (set_dynpageflag(&free_map, page))
+#define ClearPageNosaveFree(page) (clear_dynpageflag(&free_map, page))
+
+extern void save_dyn_pageflags(struct dyn_pageflags *pagemap);
+extern int load_dyn_pageflags(struct dyn_pageflags *pagemap);
+extern int toi_pageflags_space_needed(void);
diff --git a/kernel/power/tuxonice_power_off.c b/kernel/power/tuxonice_power_off.c
new file mode 100644
index 0000000..e35736f
--- /dev/null
+++ b/kernel/power/tuxonice_power_off.c
@@ -0,0 +1,284 @@
+/*
+ * kernel/power/tuxonice_power_off.c
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Support for powering down.
+ */
+
+#include <linux/device.h>
+#include <linux/suspend.h>
+#include <linux/mm.h>
+#include <linux/pm.h>
+#include <linux/reboot.h>
+#include <linux/cpu.h>
+#include <linux/console.h>
+#include <linux/fs.h>
+#include "tuxonice.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_power_off.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_modules.h"
+
+unsigned long toi_poweroff_method; /* 0 - Kernel power off */
+EXPORT_SYMBOL_GPL(toi_poweroff_method);
+
+int wake_delay;
+static char lid_state_file[256], wake_alarm_dir[256];
+static struct file *lid_file, *alarm_file, *epoch_file;
+int post_wake_state = -1;
+
+static int did_suspend_to_both;
+
+/*
+ * __toi_power_down
+ * Functionality   : Powers down or reboots the computer once the image
+ *                   has been written to disk.
+ * Key Assumptions : Able to reboot/power down via code called or that
+ *                   the warning emitted if the calls fail will be visible
+ *                   to the user (ie printk resumes devices).
+ */
+
+static void __toi_power_down(int method)
+{
+       int error;
+
+       if (test_action_state(TOI_REBOOT)) {
+               toi_cond_pause(1, "Ready to reboot.");
+               kernel_restart(NULL);
+       }
+
+       toi_cond_pause(1, "Powering down.");
+
+       switch (method) {
+       case 0:
+               break;
+       case 3:
+               error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
+               if (!error) {
+                       error = suspend_devices_and_enter(PM_SUSPEND_MEM);
+                       if (!error)
+                               did_suspend_to_both = 1;
+               }
+               pm_notifier_call_chain(PM_POST_SUSPEND);
+
+               /* Success - we're now post-resume-from-ram */
+               if (did_suspend_to_both)
+                       return;
+
+               /* Failed to suspend to ram - do normal power off */
+               break;
+       case 4:
+               /* 
+                * If succeeds, doesn't return. If fails, do a simple
+                * powerdown.
+                */
+               hibernation_platform_enter();
+               break;
+       case 5:
+               /* Historic entry only now */
+               break;
+       }
+
+       if (method && method != 5)
+               toi_cond_pause(1,
+                       "Falling back to alternate power off method.");
+
+       if (test_result_state(TOI_ABORTED))
+               return;
+
+       kernel_power_off();
+       kernel_halt();
+       toi_cond_pause(1, "Powerdown failed.");
+       while (1)
+               cpu_relax();
+}
+
+#define CLOSE_FILE(file) \
+       if (file) { \
+               filp_close(file, NULL); file = NULL; \
+       }
+
+static void powerdown_cleanup(int toi_or_resume)
+{
+       if (!toi_or_resume)
+               return;
+
+       CLOSE_FILE(lid_file);
+       CLOSE_FILE(alarm_file);
+       CLOSE_FILE(epoch_file);
+}
+
+static void open_file(char *format, char *arg, struct file **var, int mode,
+               char *desc)
+{
+       char buf[256];
+
+       if (strlen(arg)) {
+               sprintf(buf, format, arg);
+               *var = filp_open(buf, mode, 0);
+               if (IS_ERR(*var) || !*var) {
+                       printk(KERN_INFO "Failed to open %s file '%s' (%p).\n",
+                               desc, buf, *var);
+                       *var = 0;
+               }
+       }
+}
+
+static int powerdown_init(int toi_or_resume)
+{
+       if (!toi_or_resume)
+               return 0;
+
+       did_suspend_to_both = 0;
+
+       open_file("/proc/acpi/button/%s/state", lid_state_file, &lid_file,
+                       O_RDONLY, "lid");
+
+       if (strlen(wake_alarm_dir)) {
+               open_file("/sys/class/rtc/%s/wakealarm", wake_alarm_dir,
+                               &alarm_file, O_WRONLY, "alarm");
+
+               open_file("/sys/class/rtc/%s/since_epoch", wake_alarm_dir,
+                               &epoch_file, O_RDONLY, "epoch");
+       }
+
+       return 0;
+}
+
+static int lid_closed(void)
+{
+       char array[25];
+       ssize_t size;
+       loff_t pos = 0;
+
+       if (!lid_file)
+               return 0;
+
+       size = vfs_read(lid_file, (char __user *) array, 25, &pos);
+       if ((int) size < 1) {
+               printk(KERN_INFO "Failed to read lid state file (%d).\n",
+                       (int) size);
+               return 0;
+       }
+
+       if (!strcmp(array, "state:      closed\n"))
+               return 1;
+
+       return 0;
+}
+
+static void write_alarm_file(int value)
+{
+       ssize_t size;
+       char buf[40];
+       loff_t pos = 0;
+
+       if (!alarm_file)
+               return;
+
+       sprintf(buf, "%d\n", value);
+
+       size = vfs_write(alarm_file, (char __user *)buf, strlen(buf), &pos);
+
+       if (size < 0)
+               printk(KERN_INFO "Error %d writing alarm value %s.\n",
+                               (int) size, buf);
+}
+
+/**
+ * toi_check_resleep: See whether to powerdown again after waking.
+ *
+ * After waking, check whether we should powerdown again in a (usually
+ * different) way. We only do this if the lid switch is still closed.
+ */
+void toi_check_resleep(void)
+{
+       /* We only return if we suspended to ram and woke. */
+       if (lid_closed() && post_wake_state >= 0)
+               __toi_power_down(post_wake_state);
+}
+
+void toi_power_down(void)
+{
+       if (alarm_file && wake_delay) {
+               char array[25];
+               loff_t pos = 0;
+               size_t size = vfs_read(epoch_file, (char __user *) array, 25,
+                               &pos);
+
+               if (((int) size) < 1)
+                       printk(KERN_INFO "Failed to read epoch file (%d).\n",
+                                       (int) size);
+               else {
+                       unsigned long since_epoch =
+                               simple_strtol(array, NULL, 0);
+
+                       /* Clear any wakeup time. */
+                       write_alarm_file(0);
+
+                       /* Set new wakeup time. */
+                       write_alarm_file(since_epoch + wake_delay);
+               }
+       }
+
+       __toi_power_down(toi_poweroff_method);
+
+       toi_check_resleep();
+}
+EXPORT_SYMBOL_GPL(toi_power_down);
+
+static struct toi_sysfs_data sysfs_params[] = {
+#if defined(CONFIG_ACPI)
+       {
+        TOI_ATTR("lid_file", SYSFS_RW),
+        SYSFS_STRING(lid_state_file, 256, 0),
+       },
+
+       {
+         TOI_ATTR("wake_delay", SYSFS_RW),
+         SYSFS_INT(&wake_delay, 0, INT_MAX, 0)
+       },
+
+       {
+         TOI_ATTR("wake_alarm_dir", SYSFS_RW),
+         SYSFS_STRING(wake_alarm_dir, 256, 0)
+       },
+
+       { TOI_ATTR("post_wake_state", SYSFS_RW),
+         SYSFS_INT(&post_wake_state, -1, 5, 0)
+       },
+
+       { TOI_ATTR("powerdown_method", SYSFS_RW),
+         SYSFS_UL(&toi_poweroff_method, 0, 5, 0)
+       },
+
+       { TOI_ATTR("did_suspend_to_both", SYSFS_READONLY),
+         SYSFS_INT(&did_suspend_to_both, 0, 0, 0)
+       },
+#endif
+};
+
+static struct toi_module_ops powerdown_ops = {
+       .type                           = MISC_HIDDEN_MODULE,
+       .name                           = "poweroff",
+       .initialise                     = powerdown_init,
+       .cleanup                        = powerdown_cleanup,
+       .directory                      = "[ROOT]",
+       .module                         = THIS_MODULE,
+       .sysfs_data                     = sysfs_params,
+       .num_sysfs_entries              = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+int toi_poweroff_init(void)
+{
+       return toi_register_module(&powerdown_ops);
+}
+
+void toi_poweroff_exit(void)
+{
+       toi_unregister_module(&powerdown_ops);
+}
diff --git a/kernel/power/tuxonice_power_off.h b/kernel/power/tuxonice_power_off.h
new file mode 100644
index 0000000..bd2a46f
--- /dev/null
+++ b/kernel/power/tuxonice_power_off.h
@@ -0,0 +1,34 @@
+/*
+ * kernel/power/tuxonice_power_off.h
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Support for the powering down.
+ */
+
+int toi_pm_state_finish(void);
+void toi_power_down(void);
+extern unsigned long toi_poweroff_method;
+extern int toi_platform_prepare(void);
+int toi_poweroff_init(void);
+void toi_poweroff_exit(void);
+void toi_check_resleep(void);
+
+extern int platform_begin(int platform_mode);
+extern int platform_pre_snapshot(int platform_mode);
+extern int platform_leave(int platform_mode);
+extern int platform_end(int platform_mode);
+extern int platform_finish(int platform_mode);
+extern int platform_pre_restore(int platform_mode);
+extern int platform_restore_cleanup(int platform_mode);
+
+#define platform_test() (toi_poweroff_method == 4)
+#define toi_platform_begin() platform_begin(platform_test())
+#define toi_platform_pre_snapshot() platform_pre_snapshot(platform_test())
+#define toi_platform_leave() platform_leave(platform_test())
+#define toi_platform_end() platform_end(platform_test())
+#define toi_platform_finish() platform_finish(platform_test())
+#define toi_platform_pre_restore() platform_pre_restore(platform_test())
+#define toi_platform_restore_cleanup() platform_restore_cleanup(platform_test())
diff --git a/kernel/power/tuxonice_prepare_image.c b/kernel/power/tuxonice_prepare_image.c
new file mode 100644
index 0000000..68f2fd3
--- /dev/null
+++ b/kernel/power/tuxonice_prepare_image.c
@@ -0,0 +1,1056 @@
+/*
+ * kernel/power/tuxonice_prepare_image.c
+ *
+ * Copyright (C) 2003-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * We need to eat memory until we can:
+ * 1. Perform the save without changing anything (RAM_NEEDED < #pages)
+ * 2. Fit it all in available space (toiActiveAllocator->available_space() >=
+ *    main_storage_needed())
+ * 3. Reload the pagedir and pageset1 to places that don't collide with their
+ *    final destinations, not knowing to what extent the resumed kernel will
+ *    overlap with the one loaded at boot time. I think the resumed kernel
+ *    should overlap completely, but I don't want to rely on this as it is
+ *    an unproven assumption. We therefore assume there will be no overlap at
+ *    all (worse case).
+ * 4. Meet the user's requested limit (if any) on the size of the image.
+ *    The limit is in MB, so pages/256 (assuming 4K pages).
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <linux/freezer.h>
+#include <linux/hardirq.h>
+#include <linux/mmzone.h>
+#include <linux/console.h>
+
+#include "tuxonice_pageflags.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_io.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_extent.h"
+#include "tuxonice_prepare_image.h"
+#include "tuxonice_block_io.h"
+#include "tuxonice.h"
+#include "tuxonice_checksum.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_alloc.h"
+
+static long num_nosave, header_space_allocated, main_storage_allocated,
+          storage_available;
+long extra_pd1_pages_allowance = CONFIG_TOI_DEFAULT_EXTRA_PAGES_ALLOWANCE;
+int image_size_limit;
+
+struct attention_list {
+       struct task_struct *task;
+       struct attention_list *next;
+};
+
+static struct attention_list *attention_list;
+
+#define PAGESET1 0
+#define PAGESET2 1
+
+void free_attention_list(void)
+{
+       struct attention_list *last = NULL;
+
+       while (attention_list) {
+               last = attention_list;
+               attention_list = attention_list->next;
+               toi_kfree(6, last);
+       }
+}
+
+static int build_attention_list(void)
+{
+       int i, task_count = 0;
+       struct task_struct *p;
+       struct attention_list *next;
+
+       /*
+        * Count all userspace process (with task->mm) marked PF_NOFREEZE.
+        */
+       read_lock(&tasklist_lock);
+       for_each_process(p)
+               if ((p->flags & PF_NOFREEZE) || p == current)
+                       task_count++;
+       read_unlock(&tasklist_lock);
+
+       /*
+        * Allocate attention list structs.
+        */
+       for (i = 0; i < task_count; i++) {
+               struct attention_list *this =
+                       toi_kzalloc(6, sizeof(struct attention_list),
+                                       TOI_WAIT_GFP);
+               if (!this) {
+                       printk(KERN_INFO "Failed to allocate slab for "
+                                       "attention list.\n");
+                       free_attention_list();
+                       return 1;
+               }
+               this->next = NULL;
+               if (attention_list)
+                       this->next = attention_list;
+               attention_list = this;
+       }
+
+       next = attention_list;
+       read_lock(&tasklist_lock);
+       for_each_process(p)
+               if ((p->flags & PF_NOFREEZE) || p == current) {
+                       next->task = p;
+                       next = next->next;
+               }
+       read_unlock(&tasklist_lock);
+       return 0;
+}
+
+static void pageset2_full(void)
+{
+       struct zone *zone;
+       unsigned long flags;
+
+       for_each_zone(zone) {
+               spin_lock_irqsave(&zone->lru_lock, flags);
+               if (zone_page_state(zone, NR_INACTIVE)) {
+                       struct page *page;
+                       list_for_each_entry(page, &zone->inactive_list, lru)
+                               SetPagePageset2(page);
+               }
+               if (zone_page_state(zone, NR_ACTIVE)) {
+                       struct page *page;
+                       list_for_each_entry(page, &zone->active_list, lru)
+                               SetPagePageset2(page);
+               }
+               spin_unlock_irqrestore(&zone->lru_lock, flags);
+       }
+}
+
+/*
+ * toi_mark_task_as_pageset
+ * Functionality   : Marks all the saveable pages belonging to a given process
+ *                  as belonging to a particular pageset.
+ */
+
+static void toi_mark_task_as_pageset(struct task_struct *t, int pageset2)
+{
+       struct vm_area_struct *vma;
+       struct mm_struct *mm;
+
+       mm = t->active_mm;
+
+       if (!mm || !mm->mmap)
+               return;
+
+       if (!irqs_disabled())
+               down_read(&mm->mmap_sem);
+
+       for (vma = mm->mmap; vma; vma = vma->vm_next) {
+               unsigned long posn;
+
+               if (vma->vm_flags & (VM_PFNMAP | VM_IO | VM_RESERVED) ||
+                   !vma->vm_start)
+                       continue;
+
+               for (posn = vma->vm_start; posn < vma->vm_end;
+                               posn += PAGE_SIZE) {
+                       struct page *page = follow_page(vma, posn, 0);
+                       if (!page)
+                               continue;
+
+                       if (pageset2)
+                               SetPagePageset2(page);
+                       else {
+                               ClearPagePageset2(page);
+                               SetPagePageset1(page);
+                       }
+               }
+       }
+
+       if (!irqs_disabled())
+               up_read(&mm->mmap_sem);
+}
+
+/* mark_pages_for_pageset2
+ *
+ * Description:        Mark unshared pages in processes not needed for hibernate as
+ *             being able to be written out in a separate pagedir.
+ *             HighMem pages are simply marked as pageset2. They won't be
+ *             needed during hibernate.
+ */
+
+static void toi_mark_pages_for_pageset2(void)
+{
+       struct task_struct *p;
+       struct attention_list *this = attention_list;
+
+       if (test_action_state(TOI_NO_PAGESET2))
+               return;
+
+       clear_dyn_pageflags(&pageset2_map);
+
+       if (test_action_state(TOI_PAGESET2_FULL))
+               pageset2_full();
+       else {
+               read_lock(&tasklist_lock);
+               for_each_process(p) {
+                       if (!p->mm || (p->flags & PF_KTHREAD))
+                               continue;
+
+                       toi_mark_task_as_pageset(p, PAGESET2);
+               }
+               read_unlock(&tasklist_lock);
+       }
+
+       /*
+        * Because the tasks in attention_list are ones related to hibernating,
+        * we know that they won't go away under us.
+        */
+
+       while (this) {
+               if (!test_result_state(TOI_ABORTED))
+                       toi_mark_task_as_pageset(this->task, PAGESET1);
+               this = this->next;
+       }
+}
+
+/*
+ * The atomic copy of pageset1 is stored in pageset2 pages.
+ * But if pageset1 is larger (normally only just after boot),
+ * we need to allocate extra pages to store the atomic copy.
+ * The following data struct and functions are used to handle
+ * the allocation and freeing of that memory.
+ */
+
+static long extra_pages_allocated;
+
+struct extras {
+       struct page *page;
+       int order;
+       struct extras *next;
+};
+
+static struct extras *extras_list;
+
+/* toi_free_extra_pagedir_memory
+ *
+ * Description:        Free previously allocated extra pagedir memory.
+ */
+void toi_free_extra_pagedir_memory(void)
+{
+       /* Free allocated pages */
+       while (extras_list) {
+               struct extras *this = extras_list;
+               int i;
+
+               extras_list = this->next;
+
+               for (i = 0; i < (1 << this->order); i++)
+                       ClearPageNosave(this->page + i);
+
+               toi_free_pages(9, this->page, this->order);
+               toi_kfree(7, this);
+       }
+
+       extra_pages_allocated = 0;
+}
+
+/* toi_allocate_extra_pagedir_memory
+ *
+ * Description:        Allocate memory for making the atomic copy of pagedir1 in the
+ *             case where it is bigger than pagedir2.
+ * Arguments:  int     num_to_alloc: Number of extra pages needed.
+ * Result:     int.    Number of extra pages we now have allocated.
+ */
+static int toi_allocate_extra_pagedir_memory(int extra_pages_needed)
+{
+       int j, order, num_to_alloc = extra_pages_needed - extra_pages_allocated;
+       unsigned long flags = TOI_ATOMIC_GFP;
+
+       if (num_to_alloc < 1)
+               return 0;
+
+       order = fls(num_to_alloc);
+       if (order >= MAX_ORDER)
+               order = MAX_ORDER - 1;
+
+       while (num_to_alloc) {
+               struct page *newpage;
+               unsigned long virt;
+               struct extras *extras_entry;
+
+               while ((1 << order) > num_to_alloc)
+                       order--;
+
+               extras_entry = (struct extras *) toi_kzalloc(7,
+                       sizeof(struct extras), TOI_ATOMIC_GFP);
+
+               if (!extras_entry)
+                       return extra_pages_allocated;
+
+               virt = toi_get_free_pages(9, flags, order);
+               while (!virt && order) {
+                       order--;
+                       virt = toi_get_free_pages(9, flags, order);
+               }
+
+               if (!virt) {
+                       toi_kfree(7, extras_entry);
+                       return extra_pages_allocated;
+               }
+
+               newpage = virt_to_page(virt);
+
+               extras_entry->page = newpage;
+               extras_entry->order = order;
+               extras_entry->next = NULL;
+
+               if (extras_list)
+                       extras_entry->next = extras_list;
+
+               extras_list = extras_entry;
+
+               for (j = 0; j < (1 << order); j++) {
+                       SetPageNosave(newpage + j);
+                       SetPagePageset1Copy(newpage + j);
+               }
+
+               extra_pages_allocated += (1 << order);
+               num_to_alloc -= (1 << order);
+       }
+
+       return extra_pages_allocated;
+}
+
+/*
+ * real_nr_free_pages: Count pcp pages for a zone type or all zones
+ * (-1 for all, otherwise zone_idx() result desired).
+ */
+long real_nr_free_pages(unsigned long zone_idx_mask)
+{
+       struct zone *zone;
+       int result = 0, cpu;
+
+       /* PCP lists */
+       for_each_zone(zone) {
+               if (!populated_zone(zone))
+                       continue;
+
+               if (!(zone_idx_mask & (1 << zone_idx(zone))))
+                       continue;
+
+               for_each_online_cpu(cpu) {
+                       struct per_cpu_pageset *pset = zone_pcp(zone, cpu);
+                       struct per_cpu_pages *pcp = &pset->pcp;
+                       result += pcp->count;
+               }
+
+               result += zone_page_state(zone, NR_FREE_PAGES);
+       }
+       return result;
+}
+
+/*
+ * Discover how much extra memory will be required by the drivers
+ * when they're asked to hibernate. We can then ensure that amount
+ * of memory is available when we really want it.
+ */
+static void get_extra_pd1_allowance(void)
+{
+       long orig_num_free = real_nr_free_pages(all_zones_mask), final;
+
+       toi_prepare_status(CLEAR_BAR, "Finding allowance for drivers.");
+
+       suspend_console();
+       device_suspend(PMSG_FREEZE);
+       device_pm_lock();
+       local_irq_disable(); /* irqs might have been re-enabled on us */
+       device_power_down(PMSG_FREEZE);
+
+       final = real_nr_free_pages(all_zones_mask);
+
+       device_power_up(PMSG_THAW);
+       local_irq_enable();
+       device_pm_unlock();
+       device_resume(PMSG_THAW);
+       resume_console();
+
+       extra_pd1_pages_allowance = max(
+               orig_num_free - final + MIN_EXTRA_PAGES_ALLOWANCE,
+               (long) MIN_EXTRA_PAGES_ALLOWANCE);
+}
+
+/*
+ * Amount of storage needed, possibly taking into account the
+ * expected compression ratio and possibly also ignoring our
+ * allowance for extra pages.
+ */
+static long main_storage_needed(int use_ecr,
+               int ignore_extra_pd1_allow)
+{
+       return (pagedir1.size + pagedir2.size +
+         (ignore_extra_pd1_allow ? 0 : extra_pd1_pages_allowance)) *
+        (use_ecr ? toi_expected_compression_ratio() : 100) / 100;
+}
+
+/*
+ * Storage needed for the image header, in bytes until the return.
+ */
+static long header_storage_needed(void)
+{
+       long bytes = (int) sizeof(struct toi_header) +
+                       toi_header_storage_for_modules() +
+                       toi_pageflags_space_needed();
+
+       return DIV_ROUND_UP(bytes, PAGE_SIZE);
+}
+
+/*
+ * When freeing memory, pages from either pageset might be freed.
+ *
+ * When seeking to free memory to be able to hibernate, for every ps1 page
+ * freed, we need 2 less pages for the atomic copy because there is one less
+ * page to copy and one more page into which data can be copied.
+ *
+ * Freeing ps2 pages saves us nothing directly. No more memory is available
+ * for the atomic copy. Indirectly, a ps1 page might be freed (slab?), but
+ * that's too much work to figure out.
+ *
+ * => ps1_to_free functions
+ *
+ * Of course if we just want to reduce the image size, because of storage
+ * limitations or an image size limit either ps will do.
+ *
+ * => any_to_free function
+ */
+
+static long highpages_ps1_to_free(void)
+{
+       return max_t(long, 0, DIV_ROUND_UP(get_highmem_size(pagedir1) -
+               get_highmem_size(pagedir2), 2) - real_nr_free_high_pages());
+}
+
+static long lowpages_ps1_to_free(void)
+{
+       return max_t(long, 0, DIV_ROUND_UP(get_lowmem_size(pagedir1) +
+               extra_pd1_pages_allowance + MIN_FREE_RAM +
+               toi_memory_for_modules(0) - get_lowmem_size(pagedir2) -
+               real_nr_free_low_pages() - extra_pages_allocated, 2));
+}
+
+static long current_image_size(void)
+{
+       return pagedir1.size + pagedir2.size + header_space_allocated;
+}
+
+static long storage_still_required(void)
+{
+       return max_t(long, 0, main_storage_needed(1, 1) - storage_available);
+}
+
+static long ram_still_required(void)
+{
+       return max_t(long, 0, MIN_FREE_RAM + toi_memory_for_modules(0) -
+               real_nr_free_low_pages() + 2 * extra_pd1_pages_allowance);
+}
+
+static long any_to_free(int use_image_size_limit)
+{
+       long user_limit = (use_image_size_limit && image_size_limit > 0) ?
+               max_t(long, 0, current_image_size() - (image_size_limit << 8))
+               : 0;
+
+       long storage_limit = storage_still_required(),
+           ram_limit = ram_still_required();
+
+       return max(max(user_limit, storage_limit), ram_limit);
+}
+
+/* amount_needed
+ *
+ * Calculates the amount by which the image size needs to be reduced to meet
+ * our constraints.
+ */
+static long amount_needed(int use_image_size_limit)
+{
+       return max(highpages_ps1_to_free() + lowpages_ps1_to_free(),
+                       any_to_free(use_image_size_limit));
+}
+
+static long image_not_ready(int use_image_size_limit)
+{
+       toi_message(TOI_EAT_MEMORY, TOI_LOW, 1,
+               "Amount still needed (%ld) > 0:%d. Header: %ld < %ld: %d,"
+               " Storage allocd: %ld < %ld: %d.\n",
+                       amount_needed(use_image_size_limit),
+                       (amount_needed(use_image_size_limit) > 0),
+                       header_space_allocated, header_storage_needed(),
+                       header_space_allocated < header_storage_needed(),
+                       main_storage_allocated,
+                       main_storage_needed(1, 1),
+                       main_storage_allocated < main_storage_needed(1, 1));
+
+       toi_cond_pause(0, NULL);
+
+       return (amount_needed(use_image_size_limit) > 0) ||
+               header_space_allocated < header_storage_needed() ||
+                main_storage_allocated < main_storage_needed(1, 1);
+}
+
+static void display_failure_reason(int tries_exceeded)
+{
+       long storage_required = storage_still_required(),
+           ram_required = ram_still_required(),
+           high_ps1 = highpages_ps1_to_free(),
+           low_ps1 = lowpages_ps1_to_free();
+
+       printk(KERN_INFO "Failed to prepare the image because...\n");
+
+       if (!storage_available) {
+               printk(KERN_INFO "- You need some storage available to be "
+                               "able to hibernate.\n");
+               return;
+       }
+
+       if (tries_exceeded)
+               printk(KERN_INFO "- The maximum number of iterations was "
+                               "reached without successfully preparing the "
+                               "image.\n");
+
+       if (header_space_allocated < header_storage_needed()) {
+               printk(KERN_INFO "- Insufficient header storage allocated. "
+                               "Need %ld, have %ld.\n",
+                               header_storage_needed(),
+                               header_space_allocated);
+               set_abort_result(TOI_INSUFFICIENT_STORAGE);
+       }
+
+       if (storage_required) {
+               printk(KERN_INFO " - We need at least %ld pages of storage "
+                               "(ignoring the header), but only have %ld.\n",
+                               main_storage_needed(1, 1),
+                               main_storage_allocated);
+               set_abort_result(TOI_INSUFFICIENT_STORAGE);
+       }
+
+       if (ram_required) {
+               printk(KERN_INFO " - We need %ld more free pages of low "
+                               "memory.\n", ram_required);
+               printk(KERN_INFO "     Minimum free     : %8d\n", MIN_FREE_RAM);
+               printk(KERN_INFO "   + Reqd. by modules : %8ld\n",
+                               toi_memory_for_modules(0));
+               printk(KERN_INFO "   - Currently free   : %8ld\n",
+                               real_nr_free_low_pages());
+               printk(KERN_INFO "   + 2 * extra allow  : %8ld\n",
+                               2 * extra_pd1_pages_allowance);
+               printk(KERN_INFO "                      : ========\n");
+               printk(KERN_INFO "     Still needed     : %8ld\n",
+                               ram_required);
+
+               /* Print breakdown of memory needed for modules */
+               toi_memory_for_modules(1);
+               set_abort_result(TOI_UNABLE_TO_FREE_ENOUGH_MEMORY);
+       }
+
+       if (high_ps1) {
+               printk(KERN_INFO "- We need to free %ld highmem pageset 1 "
+                               "pages.\n", high_ps1);
+               set_abort_result(TOI_UNABLE_TO_FREE_ENOUGH_MEMORY);
+       }
+
+       if (low_ps1) {
+               printk(KERN_INFO " - We need to free %ld lowmem pageset 1 "
+                               "pages.\n", low_ps1);
+               set_abort_result(TOI_UNABLE_TO_FREE_ENOUGH_MEMORY);
+       }
+}
+
+static void display_stats(int always, int sub_extra_pd1_allow)
+{
+       char buffer[255];
+       snprintf(buffer, 254,
+               "Free:%ld(%ld). Sets:%ld(%ld),%ld(%ld). Header:%ld/%ld. "
+               "Nosave:%ld-%ld=%ld. Storage:%lu/%lu(%lu=>%lu). "
+               "Needed:%ld,%ld,%ld(%d,%ld,%ld,%ld)\n",
+
+               /* Free */
+               real_nr_free_pages(all_zones_mask),
+               real_nr_free_low_pages(),
+
+               /* Sets */
+               pagedir1.size, pagedir1.size - get_highmem_size(pagedir1),
+               pagedir2.size, pagedir2.size - get_highmem_size(pagedir2),
+
+               /* Header */
+               header_space_allocated, header_storage_needed(),
+
+               /* Nosave */
+               num_nosave, extra_pages_allocated,
+               num_nosave - extra_pages_allocated,
+
+               /* Storage */
+               main_storage_allocated,
+               storage_available,
+               main_storage_needed(1, sub_extra_pd1_allow),
+               main_storage_needed(1, 1),
+
+               /* Needed */
+               lowpages_ps1_to_free(), highpages_ps1_to_free(),
+               any_to_free(1),
+               MIN_FREE_RAM, toi_memory_for_modules(0),
+               extra_pd1_pages_allowance, ((long) image_size_limit) << 8);
+
+       if (always)
+               printk(buffer);
+       else
+               toi_message(TOI_EAT_MEMORY, TOI_MEDIUM, 1, buffer);
+}
+
+/* generate_free_page_map
+ *
+ * Description:        This routine generates a bitmap of free pages from the
+ *             lists used by the memory manager. We then use the bitmap
+ *             to quickly calculate which pages to save and in which
+ *             pagesets.
+ */
+static void generate_free_page_map(void)
+{
+       int order, pfn, cpu, t;
+       unsigned long flags, i;
+       struct zone *zone;
+       struct list_head *curr;
+
+       for_each_zone(zone) {
+               if (!populated_zone(zone))
+                       continue;
+
+               spin_lock_irqsave(&zone->lock, flags);
+
+               for (i = 0; i < zone->spanned_pages; i++)
+                       ClearPageNosaveFree(pfn_to_page(
+                                               zone->zone_start_pfn + i));
+
+               for_each_migratetype_order(order, t) {
+                       list_for_each(curr,
+                                       &zone->free_area[order].free_list[t]) {
+                               unsigned long i;
+
+                               pfn = page_to_pfn(list_entry(curr, struct page,
+                                                       lru));
+                               for (i = 0; i < (1UL << order); i++)
+                                       SetPageNosaveFree(pfn_to_page(pfn + i));
+                       }
+               }
+
+               for_each_online_cpu(cpu) {
+                       struct per_cpu_pageset *pset = zone_pcp(zone, cpu);
+                       struct per_cpu_pages *pcp = &pset->pcp;
+                       struct page *page;
+
+                       list_for_each_entry(page, &pcp->list, lru)
+                               SetPageNosaveFree(page);
+               }
+
+               spin_unlock_irqrestore(&zone->lock, flags);
+       }
+}
+
+/* size_of_free_region
+ *
+ * Description:        Return the number of pages that are free, beginning with and
+ *             including this one.
+ */
+static int size_of_free_region(struct page *page)
+{
+       struct zone *zone = page_zone(page);
+       unsigned long this_pfn = page_to_pfn(page),
+                     orig_pfn = this_pfn,
+                     end_pfn = zone->zone_start_pfn + zone->spanned_pages - 1;
+
+       while (this_pfn <= end_pfn && PageNosaveFree(pfn_to_page(this_pfn)))
+               this_pfn++;
+
+       return this_pfn - orig_pfn;
+}
+
+/* flag_image_pages
+ *
+ * This routine generates our lists of pages to be stored in each
+ * pageset. Since we store the data using extents, and adding new
+ * extents might allocate a new extent page, this routine may well
+ * be called more than once.
+ */
+static void flag_image_pages(int atomic_copy)
+{
+       int num_free = 0;
+       unsigned long loop;
+       struct zone *zone;
+
+       pagedir1.size = 0;
+       pagedir2.size = 0;
+
+       set_highmem_size(pagedir1, 0);
+       set_highmem_size(pagedir2, 0);
+
+       num_nosave = 0;
+
+       clear_dyn_pageflags(&pageset1_map);
+
+       generate_free_page_map();
+
+       /*
+        * Pages not to be saved are marked Nosave irrespective of being
+        * reserved.
+        */
+       for_each_zone(zone) {
+               int highmem = is_highmem(zone);
+
+               if (!populated_zone(zone))
+                       continue;
+
+               for (loop = 0; loop < zone->spanned_pages; loop++) {
+                       unsigned long pfn = zone->zone_start_pfn + loop;
+                       struct page *page;
+                       int chunk_size;
+
+                       if (!pfn_valid(pfn))
+                               continue;
+
+                       page = pfn_to_page(pfn);
+
+                       chunk_size = size_of_free_region(page);
+                       if (chunk_size) {
+                               num_free += chunk_size;
+                               loop += chunk_size - 1;
+                               continue;
+                       }
+
+                       if (highmem)
+                               page = saveable_highmem_page(pfn);
+                       else
+                               page = saveable_page(pfn);
+
+                       if (!page || PageNosave(page)) {
+                               num_nosave++;
+                               continue;
+                       }
+
+                       if (PagePageset2(page)) {
+                               pagedir2.size++;
+                               if (PageHighMem(page))
+                                       inc_highmem_size(pagedir2);
+                               else
+                                       SetPagePageset1Copy(page);
+                               if (PageResave(page)) {
+                                       SetPagePageset1(page);
+                                       ClearPagePageset1Copy(page);
+                                       pagedir1.size++;
+                                       if (PageHighMem(page))
+                                               inc_highmem_size(pagedir1);
+                               }
+                       } else {
+                               pagedir1.size++;
+                               SetPagePageset1(page);
+                               if (PageHighMem(page))
+                                       inc_highmem_size(pagedir1);
+                       }
+               }
+       }
+
+       if (atomic_copy)
+               return;
+
+       toi_message(TOI_EAT_MEMORY, TOI_MEDIUM, 0,
+               "Count data pages: Set1 (%d) + Set2 (%d) + Nosave (%ld) + "
+               "NumFree (%d) = %d.\n",
+               pagedir1.size, pagedir2.size, num_nosave, num_free,
+               pagedir1.size + pagedir2.size + num_nosave + num_free);
+}
+
+void toi_recalculate_image_contents(int atomic_copy)
+{
+       clear_dyn_pageflags(&pageset1_map);
+       if (!atomic_copy) {
+               int pfn;
+               BITMAP_FOR_EACH_SET(&pageset2_map, pfn)
+                       ClearPagePageset1Copy(pfn_to_page(pfn));
+               /* Need to call this before getting pageset1_size! */
+               toi_mark_pages_for_pageset2();
+       }
+       flag_image_pages(atomic_copy);
+
+       if (!atomic_copy) {
+               storage_available = toiActiveAllocator->storage_available();
+               display_stats(0, 0);
+       }
+}
+
+/* update_image
+ *
+ * Allocate [more] memory and storage for the image.
+ */
+static void update_image(void)
+{
+       int wanted, got;
+       long seek;
+
+       toi_recalculate_image_contents(0);
+
+       /* Include allowance for growth in pagedir1 while writing pagedir 2 */
+       wanted = pagedir1.size +  extra_pd1_pages_allowance -
+               get_lowmem_size(pagedir2);
+       if (wanted > extra_pages_allocated) {
+               got = toi_allocate_extra_pagedir_memory(wanted);
+               if (wanted < got) {
+                       toi_message(TOI_EAT_MEMORY, TOI_LOW, 1,
+                               "Want %d extra pages for pageset1, got %d.\n",
+                               wanted, got);
+                       return;
+               }
+       }
+
+       thaw_kernel_threads();
+
+       /*
+        * Allocate remaining storage space, if possible, up to the
+        * maximum we know we'll need. It's okay to allocate the
+        * maximum if the writer is the swapwriter, but
+        * we don't want to grab all available space on an NFS share.
+        * We therefore ignore the expected compression ratio here,
+        * thereby trying to allocate the maximum image size we could
+        * need (assuming compression doesn't expand the image), but
+        * don't complain if we can't get the full amount we're after.
+        */
+
+       storage_available = toiActiveAllocator->storage_available();
+
+       header_space_allocated = header_storage_needed();
+
+       toiActiveAllocator->reserve_header_space(header_space_allocated);
+
+       seek = min(storage_available, main_storage_needed(0, 0));
+
+       toiActiveAllocator->allocate_storage(seek);
+
+       main_storage_allocated = toiActiveAllocator->storage_allocated();
+
+       if (freeze_processes())
+               set_abort_result(TOI_FREEZING_FAILED);
+
+       toi_recalculate_image_contents(0);
+}
+
+/* attempt_to_freeze
+ *
+ * Try to freeze processes.
+ */
+
+static int attempt_to_freeze(void)
+{
+       int result;
+
+       /* Stop processes before checking again */
+       thaw_processes();
+       toi_prepare_status(CLEAR_BAR, "Freezing processes & syncing "
+                       "filesystems.");
+       result = freeze_processes();
+
+       if (result)
+               set_abort_result(TOI_FREEZING_FAILED);
+
+       return result;
+}
+
+/* eat_memory
+ *
+ * Try to free some memory, either to meet hard or soft constraints on the image
+ * characteristics.
+ *
+ * Hard constraints:
+ * - Pageset1 must be < half of memory;
+ * - We must have enough memory free at resume time to have pageset1
+ *   be able to be loaded in pages that don't conflict with where it has to
+ *   be restored.
+ * Soft constraints
+ * - User specificied image size limit.
+ */
+static void eat_memory(void)
+{
+       long amount_wanted = 0;
+       int did_eat_memory = 0;
+
+       /*
+        * Note that if we have enough storage space and enough free memory, we
+        * may exit without eating anything. We give up when the last 10
+        * iterations ate no extra pages because we're not going to get much
+        * more anyway, but the few pages we get will take a lot of time.
+        *
+        * We freeze processes before beginning, and then unfreeze them if we
+        * need to eat memory until we think we have enough. If our attempts
+        * to freeze fail, we give up and abort.
+        */
+
+       toi_recalculate_image_contents(0);
+       amount_wanted = amount_needed(1);
+
+       switch (image_size_limit) {
+       case -1: /* Don't eat any memory */
+               if (amount_wanted > 0) {
+                       set_abort_result(TOI_WOULD_EAT_MEMORY);
+                       return;
+               }
+               break;
+       case -2:  /* Free caches only */
+               drop_pagecache();
+               toi_recalculate_image_contents(0);
+               amount_wanted = amount_needed(1);
+               did_eat_memory = 1;
+               break;
+       default:
+               break;
+       }
+
+       if (amount_wanted > 0 && !test_result_state(TOI_ABORTED) &&
+                       image_size_limit != -1) {
+               struct zone *zone;
+               int zone_idx;
+
+               toi_prepare_status(CLEAR_BAR,
+                               "Seeking to free %ldMB of memory.",
+                               MB(amount_wanted));
+
+               thaw_kernel_threads();
+
+               for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) {
+                       unsigned long zone_type_free = max_t(long,
+                                       (zone_idx == ZONE_HIGHMEM) ?
+                                       highpages_ps1_to_free() :
+                                       lowpages_ps1_to_free(), amount_wanted);
+
+                       if (zone_type_free < 0)
+                               break;
+
+                       for_each_zone(zone) {
+                               if (zone_idx(zone) != zone_idx)
+                                       continue;
+
+                               shrink_one_zone(zone, zone_type_free, 3);
+
+                               did_eat_memory = 1;
+
+                               toi_recalculate_image_contents(0);
+
+                               amount_wanted = amount_needed(1);
+                               zone_type_free = max_t(long,
+                                       (zone_idx == ZONE_HIGHMEM) ?
+                                       highpages_ps1_to_free() :
+                                       lowpages_ps1_to_free(), amount_wanted);
+
+                               if (zone_type_free < 0)
+                                       break;
+                       }
+               }
+
+               toi_cond_pause(0, NULL);
+
+               if (freeze_processes())
+                       set_abort_result(TOI_FREEZING_FAILED);
+       }
+
+       if (did_eat_memory) {
+               unsigned long orig_state = get_toi_state();
+               /* Freeze_processes will call sys_sync too */
+               restore_toi_state(orig_state);
+               toi_recalculate_image_contents(0);
+       }
+
+       /* Blank out image size display */
+       toi_update_status(100, 100, NULL);
+}
+
+/* toi_prepare_image
+ *
+ * Entry point to the whole image preparation section.
+ *
+ * We do four things:
+ * - Freeze processes;
+ * - Ensure image size constraints are met;
+ * - Complete all the preparation for saving the image,
+ *   including allocation of storage. The only memory
+ *   that should be needed when we're finished is that
+ *   for actually storing the image (and we know how
+ *   much is needed for that because the modules tell
+ *   us).
+ * - Make sure that all dirty buffers are written out.
+ */
+#define MAX_TRIES 2
+int toi_prepare_image(void)
+{
+       int result = 1, tries = 1;
+
+       header_space_allocated = 0;
+       main_storage_allocated = 0;
+
+       if (attempt_to_freeze())
+               return 1;
+
+       if (!extra_pd1_pages_allowance)
+               get_extra_pd1_allowance();
+
+       storage_available = toiActiveAllocator->storage_available();
+
+       if (!storage_available) {
+               printk(KERN_INFO "No storage available. Didn't try to prepare "
+                               "an image.\n");
+               display_failure_reason(0);
+               set_abort_result(TOI_NOSTORAGE_AVAILABLE);
+               return 1;
+       }
+
+       if (build_attention_list()) {
+               abort_hibernate(TOI_UNABLE_TO_PREPARE_IMAGE,
+                               "Unable to successfully prepare the image.\n");
+               return 1;
+       }
+
+       do {
+               toi_prepare_status(CLEAR_BAR,
+                               "Preparing Image. Try %d.", tries);
+
+               eat_memory();
+
+               if (test_result_state(TOI_ABORTED))
+                       break;
+
+               update_image();
+
+               tries++;
+
+       } while (image_not_ready(1) && tries <= MAX_TRIES &&
+                       !test_result_state(TOI_ABORTED));
+
+       result = image_not_ready(0);
+
+       if (!test_result_state(TOI_ABORTED)) {
+               if (result) {
+                       display_stats(1, 0);
+                       display_failure_reason(tries > MAX_TRIES);
+                       abort_hibernate(TOI_UNABLE_TO_PREPARE_IMAGE,
+                               "Unable to successfully prepare the image.\n");
+               } else {
+                       unlink_lru_lists();
+                       toi_cond_pause(1, "Image preparation complete.");
+               }
+       }
+
+       return result ? result : allocate_checksum_pages();
+}
+
+#ifdef CONFIG_TOI_EXPORTS
+EXPORT_SYMBOL_GPL(real_nr_free_pages);
+#endif
diff --git a/kernel/power/tuxonice_prepare_image.h b/kernel/power/tuxonice_prepare_image.h
new file mode 100644
index 0000000..428ab11
--- /dev/null
+++ b/kernel/power/tuxonice_prepare_image.h
@@ -0,0 +1,35 @@
+/*
+ * kernel/power/tuxonice_prepare_image.h
+ *
+ * Copyright (C) 2003-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ */
+
+#include <asm/sections.h>
+
+extern int toi_prepare_image(void);
+extern void toi_recalculate_image_contents(int storage_available);
+extern long real_nr_free_pages(unsigned long zone_idx_mask);
+extern int image_size_limit;
+extern void toi_free_extra_pagedir_memory(void);
+extern long extra_pd1_pages_allowance;
+extern void free_attention_list(void);
+
+#define MIN_FREE_RAM 100
+#define MIN_EXTRA_PAGES_ALLOWANCE 500
+
+#define all_zones_mask ((unsigned long) ((1 << MAX_NR_ZONES) - 1))
+#ifdef CONFIG_HIGHMEM
+#define real_nr_free_high_pages() (real_nr_free_pages(1 << ZONE_HIGHMEM))
+#define real_nr_free_low_pages() (real_nr_free_pages(all_zones_mask - \
+                                               (1 << ZONE_HIGHMEM)))
+#else
+#define real_nr_free_high_pages() (0)
+#define real_nr_free_low_pages() (real_nr_free_pages(all_zones_mask))
+
+/* For eat_memory function */
+#define ZONE_HIGHMEM (MAX_NR_ZONES + 1)
+#endif
+
diff --git a/kernel/power/tuxonice_storage.c b/kernel/power/tuxonice_storage.c
new file mode 100644
index 0000000..c3352f6
--- /dev/null
+++ b/kernel/power/tuxonice_storage.c
@@ -0,0 +1,293 @@
+/*
+ * kernel/power/tuxonice_storage.c
+ *
+ * Copyright (C) 2005-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for talking to a userspace program that manages storage.
+ *
+ * The kernel side:
+ * - starts the userspace program;
+ * - sends messages telling it when to open and close the connection;
+ * - tells it when to quit;
+ *
+ * The user space side:
+ * - passes messages regarding status;
+ *
+ */
+
+#include <linux/suspend.h>
+#include <linux/freezer.h>
+
+#include "tuxonice_sysfs.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_netlink.h"
+#include "tuxonice_storage.h"
+#include "tuxonice_ui.h"
+
+static struct user_helper_data usm_helper_data;
+static struct toi_module_ops usm_ops;
+static int message_received, usm_prepare_count;
+static int storage_manager_last_action, storage_manager_action;
+
+static int usm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+       int type;
+       int *data;
+
+       type = nlh->nlmsg_type;
+
+       /* A control message: ignore them */
+       if (type < NETLINK_MSG_BASE)
+               return 0;
+
+       /* Unknown message: reply with EINVAL */
+       if (type >= USM_MSG_MAX)
+               return -EINVAL;
+
+       /* All operations require privileges, even GET */
+       if (security_netlink_recv(skb, CAP_NET_ADMIN))
+               return -EPERM;
+
+       /* Only allow one task to receive NOFREEZE privileges */
+       if (type == NETLINK_MSG_NOFREEZE_ME && usm_helper_data.pid != -1)
+               return -EBUSY;
+
+       data = (int *) NLMSG_DATA(nlh);
+
+       switch (type) {
+       case USM_MSG_SUCCESS:
+       case USM_MSG_FAILED:
+               message_received = type;
+               complete(&usm_helper_data.wait_for_process);
+               break;
+       default:
+               printk(KERN_INFO "Storage manager doesn't recognise "
+                               "message %d.\n", type);
+       }
+
+       return 1;
+}
+
+#ifdef CONFIG_NET
+static int activations;
+
+int toi_activate_storage(int force)
+{
+       int tries = 1;
+
+       if (usm_helper_data.pid == -1 || !usm_ops.enabled)
+               return 0;
+
+       message_received = 0;
+       activations++;
+
+       if (activations > 1 && !force)
+               return 0;
+
+       while ((!message_received || message_received == USM_MSG_FAILED) &&
+                       tries < 2) {
+               toi_prepare_status(DONT_CLEAR_BAR, "Activate storage attempt "
+                               "%d.\n", tries);
+
+               init_completion(&usm_helper_data.wait_for_process);
+
+               toi_send_netlink_message(&usm_helper_data,
+                       USM_MSG_CONNECT,
+                       NULL, 0);
+
+               /* Wait 2 seconds for the userspace process to make contact */
+               wait_for_completion_timeout(&usm_helper_data.wait_for_process,
+                               2*HZ);
+
+               tries++;
+       }
+
+       return 0;
+}
+
+int toi_deactivate_storage(int force)
+{
+       if (usm_helper_data.pid == -1 || !usm_ops.enabled)
+               return 0;
+
+       message_received = 0;
+       activations--;
+
+       if (activations && !force)
+               return 0;
+
+       init_completion(&usm_helper_data.wait_for_process);
+
+       toi_send_netlink_message(&usm_helper_data,
+                       USM_MSG_DISCONNECT,
+                       NULL, 0);
+
+       wait_for_completion_timeout(&usm_helper_data.wait_for_process, 2*HZ);
+
+       if (!message_received || message_received == USM_MSG_FAILED) {
+               printk(KERN_INFO "Returning failure disconnecting storage.\n");
+               return 1;
+       }
+
+       return 0;
+}
+#endif
+
+static void storage_manager_simulate(void)
+{
+       printk(KERN_INFO "--- Storage manager simulate ---\n");
+       toi_prepare_usm();
+       schedule();
+       printk(KERN_INFO "--- Activate storage 1 ---\n");
+       toi_activate_storage(1);
+       schedule();
+       printk(KERN_INFO "--- Deactivate storage 1 ---\n");
+       toi_deactivate_storage(1);
+       schedule();
+       printk(KERN_INFO "--- Cleanup usm ---\n");
+       toi_cleanup_usm();
+       schedule();
+       printk(KERN_INFO "--- Storage manager simulate ends ---\n");
+}
+
+static int usm_storage_needed(void)
+{
+       return strlen(usm_helper_data.program);
+}
+
+static int usm_save_config_info(char *buf)
+{
+       int len = strlen(usm_helper_data.program);
+       memcpy(buf, usm_helper_data.program, len);
+       return len;
+}
+
+static void usm_load_config_info(char *buf, int size)
+{
+       /* Don't load the saved path if one has already been set */
+       if (usm_helper_data.program[0])
+               return;
+
+       memcpy(usm_helper_data.program, buf, size);
+}
+
+static int usm_memory_needed(void)
+{
+       /* ball park figure of 32 pages */
+       return 32 * PAGE_SIZE;
+}
+
+/* toi_prepare_usm
+ */
+int toi_prepare_usm(void)
+{
+       usm_prepare_count++;
+
+       if (usm_prepare_count > 1 || !usm_ops.enabled)
+               return 0;
+
+       usm_helper_data.pid = -1;
+
+       if (!*usm_helper_data.program)
+               return 0;
+
+       toi_netlink_setup(&usm_helper_data);
+
+       if (usm_helper_data.pid == -1)
+               printk(KERN_INFO "TuxOnIce Storage Manager wanted, but couldn't"
+                               " start it.\n");
+
+       toi_activate_storage(0);
+
+       return usm_helper_data.pid != -1;
+}
+
+void toi_cleanup_usm(void)
+{
+       usm_prepare_count--;
+
+       if (usm_helper_data.pid > -1 && !usm_prepare_count) {
+               toi_deactivate_storage(0);
+               toi_netlink_close(&usm_helper_data);
+       }
+}
+
+static void storage_manager_activate(void)
+{
+       if (storage_manager_action == storage_manager_last_action)
+               return;
+
+       if (storage_manager_action)
+               toi_prepare_usm();
+       else
+               toi_cleanup_usm();
+
+       storage_manager_last_action = storage_manager_action;
+}
+
+/*
+ * User interface specific /sys/power/tuxonice entries.
+ */
+
+static struct toi_sysfs_data sysfs_params[] = {
+       { TOI_ATTR("simulate_atomic_copy", SYSFS_RW),
+         .type                         = TOI_SYSFS_DATA_NONE,
+         .write_side_effect            = storage_manager_simulate,
+       },
+
+       { TOI_ATTR("enabled", SYSFS_RW),
+         SYSFS_INT(&usm_ops.enabled, 0, 1, 0)
+       },
+
+       { TOI_ATTR("program", SYSFS_RW),
+         SYSFS_STRING(usm_helper_data.program, 254, 0)
+       },
+
+       { TOI_ATTR("activate_storage", SYSFS_RW),
+         SYSFS_INT(&storage_manager_action, 0, 1, 0),
+         .write_side_effect            = storage_manager_activate,
+       }
+};
+
+static struct toi_module_ops usm_ops = {
+       .type                           = MISC_MODULE,
+       .name                           = "usm",
+       .directory                      = "storage_manager",
+       .module                         = THIS_MODULE,
+       .storage_needed                 = usm_storage_needed,
+       .save_config_info               = usm_save_config_info,
+       .load_config_info               = usm_load_config_info,
+       .memory_needed                  = usm_memory_needed,
+
+       .sysfs_data                     = sysfs_params,
+       .num_sysfs_entries              = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+/* toi_usm_sysfs_init
+ * Description: Boot time initialisation for user interface.
+ */
+int toi_usm_init(void)
+{
+       usm_helper_data.nl = NULL;
+       usm_helper_data.program[0] = '\0';
+       usm_helper_data.pid = -1;
+       usm_helper_data.skb_size = 0;
+       usm_helper_data.pool_limit = 6;
+       usm_helper_data.netlink_id = NETLINK_TOI_USM;
+       usm_helper_data.name = "userspace storage manager";
+       usm_helper_data.rcv_msg = usm_user_rcv_msg;
+       usm_helper_data.interface_version = 1;
+       usm_helper_data.must_init = 0;
+       init_completion(&usm_helper_data.wait_for_process);
+
+       return toi_register_module(&usm_ops);
+}
+
+void toi_usm_exit(void)
+{
+       toi_netlink_close_complete(&usm_helper_data);
+       toi_unregister_module(&usm_ops);
+}
diff --git a/kernel/power/tuxonice_storage.h b/kernel/power/tuxonice_storage.h
new file mode 100644
index 0000000..2f895bf
--- /dev/null
+++ b/kernel/power/tuxonice_storage.h
@@ -0,0 +1,53 @@
+/*
+ * kernel/power/tuxonice_storage.h
+ *
+ * Copyright (C) 2005-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ */
+
+#ifdef CONFIG_NET
+int toi_prepare_usm(void);
+void toi_cleanup_usm(void);
+
+int toi_activate_storage(int force);
+int toi_deactivate_storage(int force);
+extern int toi_usm_init(void);
+extern void toi_usm_exit(void);
+#else
+static inline int toi_usm_init(void) { return 0; }
+static inline void toi_usm_exit(void) { }
+
+static inline int toi_activate_storage(int force)
+{
+       return 0;
+}
+
+static inline int toi_deactivate_storage(int force)
+{
+       return 0;
+}
+
+static inline int toi_prepare_usm(void) { return 0; }
+static inline void toi_cleanup_usm(void) { }
+#endif
+
+enum {
+       USM_MSG_BASE = 0x10,
+
+       /* Kernel -> Userspace */
+       USM_MSG_CONNECT = 0x30,
+       USM_MSG_DISCONNECT = 0x31,
+       USM_MSG_SUCCESS = 0x40,
+       USM_MSG_FAILED = 0x41,
+
+       USM_MSG_MAX,
+};
+
+#ifdef CONFIG_NET
+extern __init int toi_usm_init(void);
+extern __exit void toi_usm_cleanup(void);
+#else
+#define toi_usm_init() do { } while (0)
+#define toi_usm_cleanup() do { } while (0)
+#endif
diff --git a/kernel/power/tuxonice_swap.c b/kernel/power/tuxonice_swap.c
new file mode 100644
index 0000000..aaeff27
--- /dev/null
+++ b/kernel/power/tuxonice_swap.c
@@ -0,0 +1,1284 @@
+/*
+ * kernel/power/tuxonice_swap.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * Distributed under GPLv2.
+ *
+ * This file encapsulates functions for usage of swap space as a
+ * backing store.
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/swapops.h>
+#include <linux/swap.h>
+#include <linux/syscalls.h>
+
+#include "tuxonice.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_io.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_extent.h"
+#include "tuxonice_block_io.h"
+#include "tuxonice_alloc.h"
+
+static struct toi_module_ops toi_swapops;
+
+/* --- Struct of pages stored on disk */
+
+struct sig_data {
+       dev_t device;
+       unsigned long sector;
+       int resume_attempted;
+       int orig_sig_type;
+};
+
+union diskpage {
+       union swap_header swh;  /* swh.magic is the only member used */
+       struct sig_data sig_data;
+};
+
+union p_diskpage {
+       union diskpage *pointer;
+       char *ptr;
+       unsigned long address;
+};
+
+enum {
+       IMAGE_SIGNATURE,
+       NO_IMAGE_SIGNATURE,
+       TRIED_RESUME,
+       NO_TRIED_RESUME,
+};
+
+/*
+ * Both of these point to versions of the swap header page. original_sig points
+ * to the data we read from disk at the start of hibernating or checking whether
+ * to resume. no_image is the page stored in the image header, showing what the
+ * swap header page looked like at the start of hibernating.
+ */
+static char *current_signature_page;
+static char no_image_signature_contents[sizeof(struct sig_data)];
+
+/* Devices used for swap */
+static struct toi_bdev_info devinfo[MAX_SWAPFILES];
+
+/* Extent chains for swap & blocks */
+struct hibernate_extent_chain swapextents;
+struct hibernate_extent_chain block_chain[MAX_SWAPFILES];
+
+static dev_t header_dev_t;
+static struct block_device *header_block_device;
+static unsigned long headerblock;
+
+/* For swapfile automatically swapon/off'd. */
+static char swapfilename[32] = "";
+static int toi_swapon_status;
+
+/* Header Page Information */
+static long header_pages_reserved;
+
+/* Swap Pages */
+static long swap_pages_allocated;
+
+/* User Specified Parameters. */
+
+static unsigned long resume_firstblock;
+static dev_t resume_swap_dev_t;
+static struct block_device *resume_block_device;
+
+struct sysinfo swapinfo;
+
+/* Block devices open. */
+struct bdev_opened {
+       dev_t device;
+       struct block_device *bdev;
+};
+
+/*
+ * Entry MAX_SWAPFILES is the resume block device, which may
+ * be a swap device not enabled when we hibernate.
+ * Entry MAX_SWAPFILES + 1 is the header block device, which
+ * is needed before we find out which slot it occupies.
+ *
+ * We use a separate struct to devInfo so that we can track
+ * the bdevs we open, because if we need to abort resuming
+ * prior to the atomic restore, they need to be closed, but
+ * closing them after sucessfully resuming would be wrong.
+ */
+static struct bdev_opened *bdevs_opened[MAX_SWAPFILES + 2];
+
+/**
+ * close_bdev: Close a swap bdev.
+ *
+ * int: The swap entry number to close.
+ */
+static void close_bdev(int i)
+{
+       struct bdev_opened *this = bdevs_opened[i];
+
+       if (!this)
+               return;
+
+       blkdev_put(this->bdev);
+       toi_kfree(8, this);
+       bdevs_opened[i] = NULL;
+}
+
+/**
+ * close_bdevs: Close all bdevs we opened.
+ *
+ * Close all bdevs that we opened and reset the related vars.
+ */
+static void close_bdevs(void)
+{
+       int i;
+
+       for (i = 0; i < MAX_SWAPFILES + 2; i++)
+               close_bdev(i);
+
+       resume_block_device = header_block_device = NULL;
+}
+
+/**
+ * open_bdev: Open a bdev at resume time.
+ *
+ * index: The swap index. May be MAX_SWAPFILES for the resume_dev_t
+ * (the user can have resume= pointing at a swap partition/file that isn't
+ * swapon'd when they hibernate. MAX_SWAPFILES+1 for the first page of the
+ * header. It will be from a swap partition that was enabled when we hibernated,
+ * but we don't know it's real index until we read that first page.
+ * dev_t: The device major/minor.
+ * display_errs: Whether to try to do this quietly.
+ *
+ * We stored a dev_t in the image header. Open the matching device without
+ * requiring /dev/<whatever> in most cases and record the details needed
+ * to close it later and avoid duplicating work.
+ */
+static struct block_device *open_bdev(int index, dev_t device, int display_errs)
+{
+       struct bdev_opened *this;
+       struct block_device *bdev;
+
+       if (bdevs_opened[index]) {
+               if (bdevs_opened[index]->device == device)
+                       return bdevs_opened[index]->bdev;
+
+               close_bdev(index);
+       }
+
+       bdev = toi_open_by_devnum(device, FMODE_READ);
+
+       if (IS_ERR(bdev) || !bdev) {
+               if (display_errs)
+                       toi_early_boot_message(1, TOI_CONTINUE_REQ,
+                               "Failed to get access to block device "
+                               "\"%x\" (error %d).\n Maybe you need "
+                               "to run mknod and/or lvmsetup in an "
+                               "initrd/ramfs?", device, bdev);
+               return ERR_PTR(-EINVAL);
+       }
+
+       this = toi_kzalloc(8, sizeof(struct bdev_opened), GFP_KERNEL);
+       if (!this) {
+               printk(KERN_WARNING "TuxOnIce: Failed to allocate memory for "
+                               "opening a bdev.");
+               blkdev_put(bdev);
+               return ERR_PTR(-ENOMEM);
+       }
+
+       bdevs_opened[index] = this;
+       this->device = device;
+       this->bdev = bdev;
+
+       return bdev;
+}
+
+/**
+ * enable_swapfile: Swapon the user specified swapfile prior to hibernating.
+ *
+ * Activate the given swapfile if it wasn't already enabled. Remember whether
+ * we really did swapon it for swapoffing later.
+ */
+static void enable_swapfile(void)
+{
+       int activateswapresult = -EINVAL;
+
+       if (swapfilename[0]) {
+               /* Attempt to swap on with maximum priority */
+               activateswapresult = sys_swapon(swapfilename, 0xFFFF);
+               if (activateswapresult && activateswapresult != -EBUSY)
+                       printk("TuxOnIce: The swapfile/partition specified by "
+                               "/sys/power/tuxonice/swap/swapfile "
+                               "(%s) could not be turned on (error %d). "
+                               "Attempting to continue.\n",
+                               swapfilename, activateswapresult);
+               if (!activateswapresult)
+                       toi_swapon_status = 1;
+       }
+}
+
+/**
+ * disable_swapfile: Swapoff any file swaponed at the start of the cycle.
+ *
+ * If we did successfully swapon a file at the start of the cycle, swapoff
+ * it now (finishing up).
+ */
+static void disable_swapfile(void)
+{
+       if (!toi_swapon_status)
+               return;
+
+       sys_swapoff(swapfilename);
+       toi_swapon_status = 0;
+}
+
+/**
+ * try_to_parse_resume_device: Try to parse resume=
+ *
+ * Any "swap:" has been stripped away and we just have the path to deal with.
+ * We attempt to do name_to_dev_t, open and stat the file. Having opened the
+ * file, get the struct block_device * to match.
+ */
+static int try_to_parse_resume_device(char *commandline, int quiet)
+{
+       struct kstat stat;
+       int error = 0;
+
+       resume_swap_dev_t = name_to_dev_t(commandline);
+
+       if (!resume_swap_dev_t) {
+               struct file *file = filp_open(commandline,
+                               O_RDONLY|O_LARGEFILE, 0);
+
+               if (!IS_ERR(file) && file) {
+                       vfs_getattr(file->f_vfsmnt, file->f_dentry, &stat);
+                       filp_close(file, NULL);
+               } else
+                       error = vfs_stat(commandline, &stat);
+               if (!error)
+                       resume_swap_dev_t = stat.rdev;
+       }
+
+       if (!resume_swap_dev_t) {
+               if (quiet)
+                       return 1;
+
+               if (test_toi_state(TOI_TRYING_TO_RESUME))
+                       toi_early_boot_message(1, TOI_CONTINUE_REQ,
+                         "Failed to translate \"%s\" into a device id.\n",
+                         commandline);
+               else
+                       printk("TuxOnIce: Can't translate \"%s\" into a device "
+                                       "id yet.\n", commandline);
+               return 1;
+       }
+
+       resume_block_device = open_bdev(MAX_SWAPFILES, resume_swap_dev_t, 0);
+       if (IS_ERR(resume_block_device)) {
+               if (!quiet)
+                       toi_early_boot_message(1, TOI_CONTINUE_REQ,
+                               "Failed to get access to \"%s\", where"
+                               " the swap header should be found.",
+                               commandline);
+               return 1;
+       }
+
+       return 0;
+}
+
+/*
+ * If we have read part of the image, we might have filled  memory with
+ * data that should be zeroed out.
+ */
+static void toi_swap_noresume_reset(void)
+{
+       toi_bio_ops.rw_cleanup(READ);
+       memset((char *) &devinfo, 0, sizeof(devinfo));
+}
+
+static int get_current_signature(void)
+{
+       int result;
+
+       if (current_signature_page)
+               return 0;
+
+       current_signature_page = (char *) toi_get_zeroed_page(38,
+                       TOI_ATOMIC_GFP);
+       if (!current_signature_page)
+               return -ENOMEM;
+
+       result = toi_bio_ops.bdev_page_io(READ, resume_block_device,
+               resume_firstblock, virt_to_page(current_signature_page));
+
+       return result;
+}
+
+static int parse_signature(void)
+{
+       union p_diskpage swap_header_page;
+       struct sig_data *sig;
+       int type;
+       char *swap_header;
+       const char *sigs[] = {
+               "SWAP-SPACE", "SWAPSPACE2", "S1SUSP", "S2SUSP", "S1SUSPEND"
+       };
+
+       if (!current_signature_page) {
+               int result = get_current_signature();
+
+               if (result)
+                       return result;
+       }
+
+       swap_header_page = (union p_diskpage) current_signature_page;
+       sig = (struct sig_data *) current_signature_page;
+       swap_header = swap_header_page.pointer->swh.magic.magic;
+
+       for (type = 0; type < 5; type++)
+               if (!memcmp(sigs[type], swap_header, strlen(sigs[type])))
+                       return type;
+
+       if (memcmp(tuxonice_signature, swap_header, sizeof(tuxonice_signature)))
+               return -1;
+
+       header_dev_t = sig->device;
+       clear_toi_state(TOI_RESUMED_BEFORE);
+       if (sig->resume_attempted)
+               set_toi_state(TOI_RESUMED_BEFORE);
+       headerblock = sig->sector;
+
+       return 10;
+}
+
+static void forget_signatures(void)
+{
+       if (current_signature_page) {
+               toi_free_page(38, (unsigned long) current_signature_page);
+               current_signature_page = NULL;
+       }
+}
+
+/*
+ * write_modified_signature
+ *
+ * Write a (potentially) modified signature page without forgetting the
+ * original contents.
+ */
+static int write_modified_signature(int modification)
+{
+       union p_diskpage swap_header_page;
+       struct swap_info_struct *si;
+       int result;
+       char *orig_sig;
+
+       /* In case we haven't already */
+       result = get_current_signature();
+
+       if (result)
+               return result;
+
+       swap_header_page.address = toi_get_zeroed_page(38, TOI_ATOMIC_GFP);
+
+       if (!swap_header_page.address)
+               return -ENOMEM;
+
+       memcpy(swap_header_page.ptr, current_signature_page, PAGE_SIZE);
+
+       switch (modification) {
+       case IMAGE_SIGNATURE:
+
+               memcpy(no_image_signature_contents, swap_header_page.ptr,
+                               sizeof(no_image_signature_contents));
+
+               /* Get the details of the header first page. */
+               toi_extent_state_goto_start(&toi_writer_posn);
+               toi_bio_ops.forward_one_page(1);
+
+               si = get_swap_info_struct(toi_writer_posn.current_chain);
+
+               /* Prepare the signature */
+               swap_header_page.pointer->sig_data.device = si->bdev->bd_dev;
+               swap_header_page.pointer->sig_data.sector =
+                       toi_writer_posn.current_offset;
+               swap_header_page.pointer->sig_data.resume_attempted = 0;
+               swap_header_page.pointer->sig_data.orig_sig_type =
+                       parse_signature();
+
+               memcpy(swap_header_page.pointer->swh.magic.magic,
+                               tuxonice_signature, sizeof(tuxonice_signature));
+
+               break;
+       case NO_IMAGE_SIGNATURE:
+               if (!swap_header_page.pointer->sig_data.orig_sig_type)
+                       orig_sig = "SWAP-SPACE";
+               else
+                       orig_sig = "SWAPSPACE2";
+
+               memcpy(swap_header_page.pointer->swh.magic.magic, orig_sig, 10);
+               memcpy(swap_header_page.ptr, no_image_signature_contents,
+                               sizeof(no_image_signature_contents));
+               break;
+       case TRIED_RESUME:
+               swap_header_page.pointer->sig_data.resume_attempted = 1;
+               break;
+       case NO_TRIED_RESUME:
+               swap_header_page.pointer->sig_data.resume_attempted = 0;
+               break;
+       }
+
+       result = toi_bio_ops.bdev_page_io(WRITE, resume_block_device,
+               resume_firstblock, virt_to_page(swap_header_page.address));
+
+       memcpy(current_signature_page, swap_header_page.ptr, PAGE_SIZE);
+
+       toi_free_page(38, swap_header_page.address);
+
+       return result;
+}
+
+/*
+ * apply_header_reservation
+ *
+ * Use 0 (READ) to forward_one_page so it doesn't complain if we haven't
+ * allocated storage yet.
+ */
+static int apply_header_reservation(void)
+{
+       int i;
+
+       toi_extent_state_goto_start(&toi_writer_posn);
+       toi_bio_ops.forward_one_page(0); /* To first page */
+
+       for (i = 0; i < header_pages_reserved; i++)
+               if (toi_bio_ops.forward_one_page(0))
+                       return -ENOSPC;
+
+       /* The end of header pages will be the start of pageset 2;
+        * we are now sitting on the first pageset2 page. */
+       toi_extent_state_save(&toi_writer_posn, &toi_writer_posn_save[2]);
+       return 0;
+}
+
+static void toi_swap_reserve_header_space(int request)
+{
+       header_pages_reserved = (long) request;
+
+       /* If we've already allocated storage (hence ignoring return value): */
+       apply_header_reservation();
+}
+
+static void free_block_chains(void)
+{
+       int i;
+
+       for (i = 0; i < MAX_SWAPFILES; i++)
+               if (block_chain[i].first)
+                       toi_put_extent_chain(&block_chain[i]);
+}
+
+static int add_blocks_to_extent_chain(int chain, int start, int end)
+{
+       if (test_action_state(TOI_TEST_BIO))
+               printk(KERN_INFO "Adding extent chain %d %d-%d.\n", chain,
+                               start << devinfo[chain].bmap_shift,
+                               end << devinfo[chain].bmap_shift);
+
+       if (toi_add_to_extent_chain(&block_chain[chain], start, end)) {
+               free_block_chains();
+               return -ENOMEM;
+       }
+
+       return 0;
+}
+
+
+static int get_main_pool_phys_params(void)
+{
+       struct hibernate_extent *extentpointer = NULL;
+       unsigned long address;
+       int extent_min = -1, extent_max = -1, last_chain = -1;
+
+       free_block_chains();
+
+       toi_extent_for_each(&swapextents, extentpointer, address) {
+               swp_entry_t swap_address = (swp_entry_t) { address };
+               pgoff_t offset = swp_offset(swap_address);
+               unsigned swapfilenum = swp_type(swap_address);
+               struct swap_info_struct *sis =
+                       get_swap_info_struct(swapfilenum);
+               sector_t new_sector = map_swap_page(sis, offset);
+
+               if ((new_sector == extent_max + 1) &&
+                   (last_chain == swapfilenum)) {
+                       extent_max++;
+                       continue;
+               }
+
+               if (extent_min > -1 && add_blocks_to_extent_chain(last_chain,
+                                       extent_min, extent_max))
+                       return -ENOMEM;
+
+               extent_min = extent_max = new_sector;
+               last_chain = swapfilenum;
+       }
+
+       if (extent_min > -1 && add_blocks_to_extent_chain(last_chain,
+                               extent_min, extent_max))
+                       return -ENOMEM;
+
+       return apply_header_reservation();
+}
+
+static long raw_to_real(long raw)
+{
+       long result;
+
+       result = raw - (raw * (sizeof(unsigned long) + sizeof(int)) +
+               (PAGE_SIZE + sizeof(unsigned long) + sizeof(int) + 1)) /
+               (PAGE_SIZE + sizeof(unsigned long) + sizeof(int));
+
+       return result < 0 ? 0 : result;
+}
+
+static int toi_swap_storage_allocated(void)
+{
+       return (int) raw_to_real(swap_pages_allocated - header_pages_reserved);
+}
+
+/*
+ * We can't just remember the value from allocation time, because other
+ * processes might have allocated swap in the mean time.
+ */
+static int toi_swap_storage_available(void)
+{
+       si_swapinfo(&swapinfo);
+       return (int) raw_to_real((long) swapinfo.freeswap +
+                       swap_pages_allocated - header_pages_reserved);
+}
+
+static int toi_swap_initialise(int starting_cycle)
+{
+       if (!starting_cycle)
+               return 0;
+
+       enable_swapfile();
+
+       if (resume_swap_dev_t && !resume_block_device &&
+           IS_ERR(resume_block_device =
+                       open_bdev(MAX_SWAPFILES, resume_swap_dev_t, 1)))
+               return 1;
+
+       return 0;
+}
+
+static void toi_swap_cleanup(int ending_cycle)
+{
+       if (ending_cycle)
+               disable_swapfile();
+
+       close_bdevs();
+
+       forget_signatures();
+}
+
+static int toi_swap_release_storage(void)
+{
+       if (test_action_state(TOI_KEEP_IMAGE) &&
+           test_toi_state(TOI_NOW_RESUMING))
+               return 0;
+
+       header_pages_reserved = 0;
+       swap_pages_allocated = 0;
+
+       if (swapextents.first) {
+               /* Free swap entries */
+               struct hibernate_extent *extentpointer;
+               unsigned long extentvalue;
+               toi_extent_for_each(&swapextents, extentpointer,
+                               extentvalue)
+                       swap_free((swp_entry_t) { extentvalue });
+
+               toi_put_extent_chain(&swapextents);
+
+               free_block_chains();
+       }
+
+       return 0;
+}
+
+static void free_swap_range(unsigned long min, unsigned long max)
+{
+       int j;
+
+       for (j = min; j <= max; j++)
+               swap_free((swp_entry_t) { j });
+}
+
+/*
+ * Round robin allocation (where swap storage has the same priority).
+ * could make this very inefficient, so we track extents allocated on
+ * a per-swapfile basis.
+ *
+ * We ignore here the fact that some space is for the header and doesn't
+ * have the overhead. It will only rarely make a 1 page difference.
+ */
+static int toi_swap_allocate_storage(int request)
+{
+       int i, result = 0, to_add[MAX_SWAPFILES], pages_to_get, extra_pages,
+           gotten = 0;
+       unsigned long extent_min[MAX_SWAPFILES], extent_max[MAX_SWAPFILES];
+
+       extra_pages = DIV_ROUND_UP(request * (sizeof(unsigned long)
+                              + sizeof(int)), PAGE_SIZE);
+       pages_to_get = request + extra_pages - swapextents.size;
+
+       if (pages_to_get < 1)
+               return 0;
+
+       for (i = 0; i < MAX_SWAPFILES; i++) {
+               struct swap_info_struct *si = get_swap_info_struct(i);
+               to_add[i] = 0;
+               if (!si->bdev)
+                       continue;
+               devinfo[i].bdev = si->bdev;
+               devinfo[i].dev_t = si->bdev->bd_dev;
+               devinfo[i].bmap_shift = 3;
+               devinfo[i].blocks_per_page = 1;
+       }
+
+       for (i = 0; i < pages_to_get; i++) {
+               swp_entry_t entry;
+               unsigned long new_value;
+               unsigned swapfilenum;
+
+               entry = get_swap_page();
+               if (!entry.val)
+                       break;
+
+               swapfilenum = swp_type(entry);
+               new_value = entry.val;
+
+               if (!to_add[swapfilenum]) {
+                       to_add[swapfilenum] = 1;
+                       extent_min[swapfilenum] = new_value;
+                       extent_max[swapfilenum] = new_value;
+                       gotten++;
+                       continue;
+               }
+
+               if (new_value == extent_max[swapfilenum] + 1) {
+                       extent_max[swapfilenum]++;
+                       gotten++;
+                       continue;
+               }
+
+               if (toi_add_to_extent_chain(&swapextents,
+                                       extent_min[swapfilenum],
+                                       extent_max[swapfilenum])) {
+                       printk(KERN_INFO "Failed to allocate extent for "
+                                       "%lu-%lu.\n", extent_min[swapfilenum],
+                                       extent_max[swapfilenum]);
+                       free_swap_range(extent_min[swapfilenum],
+                                       extent_max[swapfilenum]);
+                       swap_free(entry);
+                       gotten -= (extent_max[swapfilenum] -
+                                       extent_min[swapfilenum] + 1);
+                       /* Don't try to add again below */
+                       to_add[swapfilenum] = 0;
+                       break;
+               } else {
+                       extent_min[swapfilenum] = new_value;
+                       extent_max[swapfilenum] = new_value;
+                       gotten++;
+               }
+       }
+
+       for (i = 0; i < MAX_SWAPFILES; i++) {
+               if (!to_add[i] || !toi_add_to_extent_chain(&swapextents,
+                                       extent_min[i], extent_max[i]))
+                       continue;
+
+               free_swap_range(extent_min[i], extent_max[i]);
+               gotten -= (extent_max[i] - extent_min[i] + 1);
+               break;
+       }
+
+       if (gotten < pages_to_get)
+               result = -ENOSPC;
+
+       swap_pages_allocated += (long) gotten;
+
+       return result ? result : get_main_pool_phys_params();
+}
+
+static int toi_swap_write_header_init(void)
+{
+       int i, result;
+       struct swap_info_struct *si;
+
+       toi_bio_ops.rw_init(WRITE, 0);
+       toi_writer_buffer_posn = 0;
+
+       /* Info needed to bootstrap goes at the start of the header.
+        * First we save the positions and devinfo, including the number
+        * of header pages. Then we save the structs containing data needed
+        * for reading the header pages back.
+        * Note that even if header pages take more than one page, when we
+        * read back the info, we will have restored the location of the
+        * next header page by the time we go to use it.
+        */
+
+       result = toi_bio_ops.rw_header_chunk(WRITE, &toi_swapops,
+                       (char *) &no_image_signature_contents,
+                       sizeof(struct sig_data));
+
+       if (result)
+               return result;
+
+       /* Forward one page will be done prior to the read */
+       for (i = 0; i < MAX_SWAPFILES; i++) {
+               si = get_swap_info_struct(i);
+               if (si->swap_file)
+                       devinfo[i].dev_t = si->bdev->bd_dev;
+               else
+                       devinfo[i].dev_t = (dev_t) 0;
+       }
+
+       result = toi_bio_ops.rw_header_chunk(WRITE, &toi_swapops,
+                       (char *) &toi_writer_posn_save,
+                       sizeof(toi_writer_posn_save));
+
+       if (result)
+               return result;
+
+       result = toi_bio_ops.rw_header_chunk(WRITE, &toi_swapops,
+                       (char *) &devinfo, sizeof(devinfo));
+
+       if (result)
+               return result;
+
+       for (i = 0; i < MAX_SWAPFILES; i++)
+               toi_serialise_extent_chain(&toi_swapops, &block_chain[i]);
+
+       return 0;
+}
+
+static int toi_swap_write_header_cleanup(void)
+{
+       /* Write any unsaved data */
+       if (toi_writer_buffer_posn)
+               toi_bio_ops.write_header_chunk_finish();
+
+       toi_bio_ops.finish_all_io();
+
+       /* Set signature to save we have an image */
+       return write_modified_signature(IMAGE_SIGNATURE);
+}
+
+/* ------------------------- HEADER READING ------------------------- */
+
+/*
+ * read_header_init()
+ *
+ * Description:
+ * 1. Attempt to read the device specified with resume=.
+ * 2. Check the contents of the swap header for our signature.
+ * 3. Warn, ignore, reset and/or continue as appropriate.
+ * 4. If continuing, read the toi_swap configuration section
+ *    of the header and set up block device info so we can read
+ *    the rest of the header & image.
+ *
+ * Returns:
+ * May not return if user choose to reboot at a warning.
+ * -EINVAL if cannot resume at this time. Booting should continue
+ * normally.
+ */
+
+static int toi_swap_read_header_init(void)
+{
+       int i, result = 0;
+       toi_writer_buffer_posn = 0;
+
+       if (!header_dev_t) {
+               printk(KERN_INFO "read_header_init called when we haven't "
+                               "verified there is an image!\n");
+               return -EINVAL;
+       }
+
+       /*
+        * If the header is not on the resume_swap_dev_t, get the resume device
+        * first.
+        */
+       if (header_dev_t != resume_swap_dev_t) {
+               header_block_device = open_bdev(MAX_SWAPFILES + 1,
+                               header_dev_t, 1);
+
+               if (IS_ERR(header_block_device))
+                       return PTR_ERR(header_block_device);
+       } else
+               header_block_device = resume_block_device;
+
+       toi_bio_ops.read_header_init();
+
+       /*
+        * Read toi_swap configuration.
+        * Headerblock size taken into account already.
+        */
+       result = toi_bio_ops.bdev_page_io(READ, header_block_device,
+                       headerblock << 3,
+                       virt_to_page((unsigned long) toi_writer_buffer));
+       if (result)
+               return result;
+
+       memcpy(&no_image_signature_contents, toi_writer_buffer,
+                       sizeof(no_image_signature_contents));
+
+       toi_writer_buffer_posn = sizeof(no_image_signature_contents);
+
+       memcpy(&toi_writer_posn_save, toi_writer_buffer +
+                       toi_writer_buffer_posn, sizeof(toi_writer_posn_save));
+
+       toi_writer_buffer_posn += sizeof(toi_writer_posn_save);
+
+       memcpy(&devinfo, toi_writer_buffer + toi_writer_buffer_posn,
+                       sizeof(devinfo));
+
+       toi_writer_buffer_posn += sizeof(devinfo);
+
+       /* Restore device info */
+       for (i = 0; i < MAX_SWAPFILES; i++) {
+               dev_t thisdevice = devinfo[i].dev_t;
+               struct block_device *result;
+
+               devinfo[i].bdev = NULL;
+
+               if (!thisdevice)
+                       continue;
+
+               if (thisdevice == resume_swap_dev_t) {
+                       devinfo[i].bdev = resume_block_device;
+                       continue;
+               }
+
+               if (thisdevice == header_dev_t) {
+                       devinfo[i].bdev = header_block_device;
+                       continue;
+               }
+
+               result = open_bdev(i, thisdevice, 1);
+               if (IS_ERR(result))
+                       return PTR_ERR(result);
+               devinfo[i].bdev = bdevs_opened[i]->bdev;
+       }
+
+       toi_extent_state_goto_start(&toi_writer_posn);
+       toi_bio_ops.set_extra_page_forward();
+
+       for (i = 0; i < MAX_SWAPFILES && !result; i++)
+               result = toi_load_extent_chain(&block_chain[i]);
+
+       return result;
+}
+
+static int toi_swap_read_header_cleanup(void)
+{
+       toi_bio_ops.rw_cleanup(READ);
+       return 0;
+}
+
+/*
+ * workspace_size
+ *
+ * Description:
+ * Returns the number of bytes of RAM needed for this
+ * code to do its work. (Used when calculating whether
+ * we have enough memory to be able to hibernate & resume).
+ *
+ */
+static int toi_swap_memory_needed(void)
+{
+       return 1;
+}
+
+/*
+ * Print debug info
+ *
+ * Description:
+ */
+static int toi_swap_print_debug_stats(char *buffer, int size)
+{
+       int len = 0;
+       struct sysinfo sysinfo;
+
+       if (toiActiveAllocator != &toi_swapops) {
+               len = snprintf_used(buffer, size,
+                               "- SwapAllocator inactive.\n");
+               return len;
+       }
+
+       len = snprintf_used(buffer, size, "- SwapAllocator active.\n");
+       if (swapfilename[0])
+               len += snprintf_used(buffer+len, size-len,
+                       "  Attempting to automatically swapon: %s.\n",
+                       swapfilename);
+
+       si_swapinfo(&sysinfo);
+
+       len += snprintf_used(buffer+len, size-len,
+                       "  Swap available for image: %ld pages.\n",
+                       (int) sysinfo.freeswap + toi_swap_storage_allocated());
+
+       return len;
+}
+
+/*
+ * Storage needed
+ *
+ * Returns amount of space in the swap header required
+ * for the toi_swap's data. This ignores the links between
+ * pages, which we factor in when allocating the space.
+ *
+ * We ensure the space is allocated, but actually save the
+ * data from write_header_init and therefore don't also define a
+ * save_config_info routine.
+ */
+static int toi_swap_storage_needed(void)
+{
+       int i, result;
+       result = sizeof(toi_writer_posn_save) + sizeof(devinfo);
+
+       for (i = 0; i < MAX_SWAPFILES; i++) {
+               result += 3 * sizeof(int);
+               result += (2 * sizeof(unsigned long) *
+                       block_chain[i].num_extents);
+       }
+
+       return result;
+}
+
+/*
+ * Image_exists
+ *
+ * Returns -1 if don't know, otherwise 0 (no) or 1 (yes).
+ */
+static int toi_swap_image_exists(int quiet)
+{
+       int signature_found;
+
+       if (!resume_swap_dev_t) {
+               if (!quiet)
+                       printk(KERN_INFO "Not even trying to read header "
+                               "because resume_swap_dev_t is not set.\n");
+               return -1;
+       }
+
+       if (!resume_block_device &&
+           IS_ERR(resume_block_device =
+                       open_bdev(MAX_SWAPFILES, resume_swap_dev_t, 1))) {
+               if (!quiet)
+                       printk(KERN_INFO "Failed to open resume dev_t (%x).\n",
+                               resume_swap_dev_t);
+               return -1;
+       }
+
+       signature_found = parse_signature();
+
+       switch (signature_found) {
+       case -ENOMEM:
+               return -1;
+       case -1:
+               if (!quiet)
+                       printk(KERN_ERR "TuxOnIce: Unable to find a signature."
+                               " Could you have moved a swap file?\n");
+               return -1;
+       case 0:
+       case 1:
+               if (!quiet)
+                       printk(KERN_INFO "TuxOnIce: Normal swapspace found.\n");
+               return 0;
+       case 2:
+       case 3:
+       case 4:
+               if (!quiet)
+                       printk(KERN_INFO "TuxOnIce: Detected another "
+                               "implementation's signature.\n");
+               return 0;
+       case 10:
+               if (!quiet)
+                       printk(KERN_INFO "TuxOnIce: Detected TuxOnIce binary "
+                               "signature.\n");
+               return 1;
+       }
+
+       BUG();
+       return 0;
+}
+
+/* toi_swap_remove_image
+ *
+ */
+static int toi_swap_remove_image(void)
+{
+       /*
+        * If nr_hibernates == 0, we must be booting, so no swap pages
+        * will be recorded as used yet.
+        */
+
+       if (nr_hibernates)
+               toi_swap_release_storage();
+
+       /*
+        * We don't do a sanity check here: we want to restore the swap
+        * whatever version of kernel made the hibernate image.
+        *
+        * We need to write swap, but swap may not be enabled so
+        * we write the device directly
+        *
+        * If we don't have an current_signature_page, we didn't
+        * read an image header, so don't change anything.
+        */
+
+       return toi_swap_image_exists(1) ?
+               write_modified_signature(NO_IMAGE_SIGNATURE) : 0;
+}
+
+/*
+ * Mark resume attempted.
+ *
+ * Record that we tried to resume from this image. We have already read the
+ * signature in. We just need to write the modified version.
+ */
+static int toi_swap_mark_resume_attempted(int mark)
+{
+       if (!resume_swap_dev_t) {
+               printk(KERN_INFO "Not even trying to record attempt at resuming"
+                               " because resume_swap_dev_t is not set.\n");
+               return -ENODEV;
+       }
+
+       return write_modified_signature(mark ? TRIED_RESUME : NO_TRIED_RESUME);
+}
+
+/*
+ * Parse Image Location
+ *
+ * Attempt to parse a resume= parameter.
+ * Swap Writer accepts:
+ * resume=swap:DEVNAME[:FIRSTBLOCK][@BLOCKSIZE]
+ *
+ * Where:
+ * DEVNAME is convertable to a dev_t by name_to_dev_t
+ * FIRSTBLOCK is the location of the first block in the swap file
+ * (specifying for a swap partition is nonsensical but not prohibited).
+ * Data is validated by attempting to read a swap header from the
+ * location given. Failure will result in toi_swap refusing to
+ * save an image, and a reboot with correct parameters will be
+ * necessary.
+ */
+static int toi_swap_parse_sig_location(char *commandline,
+               int only_allocator, int quiet)
+{
+       char *thischar, *devstart, *colon = NULL;
+       int signature_found, result = -EINVAL, temp_result;
+
+       if (strncmp(commandline, "swap:", 5)) {
+               /*
+                * Failing swap:, we'll take a simple
+                * resume=/dev/hda2, but fall through to
+                * other allocators if /dev/ isn't matched.
+                */
+               if (strncmp(commandline, "/dev/", 5))
+                       return 1;
+       } else
+               commandline += 5;
+
+       devstart = thischar = commandline;
+       while ((*thischar != ':') && (*thischar != '@') &&
+               ((thischar - commandline) < 250) && (*thischar))
+               thischar++;
+
+       if (*thischar == ':') {
+               colon = thischar;
+               *colon = 0;
+               thischar++;
+       }
+
+       while ((thischar - commandline) < 250 && *thischar)
+               thischar++;
+
+       if (colon)
+               resume_firstblock = (int) simple_strtoul(colon + 1, NULL, 0);
+       else
+               resume_firstblock = 0;
+
+       clear_toi_state(TOI_CAN_HIBERNATE);
+       clear_toi_state(TOI_CAN_RESUME);
+
+       temp_result = try_to_parse_resume_device(devstart, quiet);
+
+       if (colon)
+               *colon = ':';
+
+       if (temp_result)
+               return -EINVAL;
+
+       signature_found = toi_swap_image_exists(quiet);
+
+       if (signature_found != -1) {
+               result = 0;
+
+               toi_bio_ops.set_devinfo(devinfo);
+               toi_writer_posn.chains = &block_chain[0];
+               toi_writer_posn.num_chains = MAX_SWAPFILES;
+               set_toi_state(TOI_CAN_HIBERNATE);
+               set_toi_state(TOI_CAN_RESUME);
+       } else
+               if (!quiet)
+                       printk(KERN_ERR "TuxOnIce: SwapAllocator: No swap "
+                               "signature found at %s.\n", devstart);
+       return result;
+}
+
+static int header_locations_read_sysfs(const char *page, int count)
+{
+       int i, printedpartitionsmessage = 0, len = 0, haveswap = 0;
+       struct inode *swapf = 0;
+       int zone;
+       char *path_page = (char *) toi_get_free_page(10, GFP_KERNEL);
+       char *path, *output = (char *) page;
+       int path_len;
+
+       if (!page)
+               return 0;
+
+       for (i = 0; i < MAX_SWAPFILES; i++) {
+               struct swap_info_struct *si =  get_swap_info_struct(i);
+
+               if (!si->swap_file)
+                       continue;
+
+               if (S_ISBLK(si->swap_file->f_mapping->host->i_mode)) {
+                       haveswap = 1;
+                       if (!printedpartitionsmessage) {
+                               len += sprintf(output + len,
+                                       "For swap partitions, simply use the "
+                                       "format: resume=swap:/dev/hda1.\n");
+                               printedpartitionsmessage = 1;
+                       }
+               } else {
+                       path_len = 0;
+
+                       path = d_path(&si->swap_file->f_path, path_page,
+                                       PAGE_SIZE);
+                       path_len = snprintf(path_page, 31, "%s", path);
+
+                       haveswap = 1;
+                       swapf = si->swap_file->f_mapping->host;
+                       zone = bmap(swapf, 0);
+                       if (!zone) {
+                               len += sprintf(output + len,
+                                       "Swapfile %s has been corrupted. Reuse"
+                                       " mkswap on it and try again.\n",
+                                       path_page);
+                       } else {
+                               char name_buffer[255];
+                               len += sprintf(output + len,
+                                       "For swapfile `%s`,"
+                                       " use resume=swap:/dev/%s:0x%x.\n",
+                                       path_page,
+                                       bdevname(si->bdev, name_buffer),
+                                       zone << (swapf->i_blkbits - 9));
+                       }
+               }
+       }
+
+       if (!haveswap)
+               len = sprintf(output, "You need to turn on swap partitions "
+                               "before examining this file.\n");
+
+       toi_free_page(10, (unsigned long) path_page);
+       return len;
+}
+
+static struct toi_sysfs_data sysfs_params[] = {
+       {
+        TOI_ATTR("swapfilename", SYSFS_RW),
+        SYSFS_STRING(swapfilename, 255, 0)
+       },
+
+       {
+        TOI_ATTR("headerlocations", SYSFS_READONLY),
+        SYSFS_CUSTOM(header_locations_read_sysfs, NULL, 0)
+       },
+
+       { TOI_ATTR("enabled", SYSFS_RW),
+         SYSFS_INT(&toi_swapops.enabled, 0, 1, 0),
+         .write_side_effect            = attempt_to_parse_resume_device2,
+       }
+};
+
+static struct toi_module_ops toi_swapops = {
+       .type                                   = WRITER_MODULE,
+       .name                                   = "swap storage",
+       .directory                              = "swap",
+       .module                                 = THIS_MODULE,
+       .memory_needed                          = toi_swap_memory_needed,
+       .print_debug_info                       = toi_swap_print_debug_stats,
+       .storage_needed                         = toi_swap_storage_needed,
+       .initialise                             = toi_swap_initialise,
+       .cleanup                                = toi_swap_cleanup,
+
+       .noresume_reset         = toi_swap_noresume_reset,
+       .storage_available      = toi_swap_storage_available,
+       .storage_allocated      = toi_swap_storage_allocated,
+       .release_storage        = toi_swap_release_storage,
+       .reserve_header_space   = toi_swap_reserve_header_space,
+       .allocate_storage       = toi_swap_allocate_storage,
+       .image_exists           = toi_swap_image_exists,
+       .mark_resume_attempted  = toi_swap_mark_resume_attempted,
+       .write_header_init      = toi_swap_write_header_init,
+       .write_header_cleanup   = toi_swap_write_header_cleanup,
+       .read_header_init       = toi_swap_read_header_init,
+       .read_header_cleanup    = toi_swap_read_header_cleanup,
+       .remove_image           = toi_swap_remove_image,
+       .parse_sig_location     = toi_swap_parse_sig_location,
+
+       .sysfs_data             = sysfs_params,
+       .num_sysfs_entries      = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+/* ---- Registration ---- */
+static __init int toi_swap_load(void)
+{
+       toi_swapops.rw_init = toi_bio_ops.rw_init;
+       toi_swapops.rw_cleanup = toi_bio_ops.rw_cleanup;
+       toi_swapops.read_page = toi_bio_ops.read_page;
+       toi_swapops.write_page = toi_bio_ops.write_page;
+       toi_swapops.rw_header_chunk = toi_bio_ops.rw_header_chunk;
+       toi_swapops.rw_header_chunk_noreadahead =
+               toi_bio_ops.rw_header_chunk_noreadahead;
+       toi_swapops.io_flusher = toi_bio_ops.io_flusher;
+
+       return toi_register_module(&toi_swapops);
+}
+
+#ifdef MODULE
+static __exit void toi_swap_unload(void)
+{
+       toi_unregister_module(&toi_swapops);
+}
+
+module_init(toi_swap_load);
+module_exit(toi_swap_unload);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("TuxOnIce SwapAllocator");
+#else
+late_initcall(toi_swap_load);
+#endif
diff --git a/kernel/power/tuxonice_sysfs.c b/kernel/power/tuxonice_sysfs.c
new file mode 100644
index 0000000..01e98d0
--- /dev/null
+++ b/kernel/power/tuxonice_sysfs.c
@@ -0,0 +1,335 @@
+/*
+ * kernel/power/tuxonice_sysfs.c
+ *
+ * Copyright (C) 2002-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * This file contains support for sysfs entries for tuning TuxOnIce.
+ *
+ * We have a generic handler that deals with the most common cases, and
+ * hooks for special handlers to use.
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+
+#include "tuxonice_sysfs.h"
+#include "tuxonice.h"
+#include "tuxonice_storage.h"
+#include "tuxonice_alloc.h"
+
+static int toi_sysfs_initialised;
+
+static void toi_initialise_sysfs(void);
+
+static struct toi_sysfs_data sysfs_params[];
+
+#define to_sysfs_data(_attr) container_of(_attr, struct toi_sysfs_data, attr)
+
+static void toi_main_wrapper(void)
+{
+       _toi_try_hibernate(0);
+}
+
+static ssize_t toi_attr_show(struct kobject *kobj, struct attribute *attr,
+                             char *page)
+{
+       struct toi_sysfs_data *sysfs_data = to_sysfs_data(attr);
+       int len = 0;
+
+       if (toi_start_anything(0))
+               return -EBUSY;
+
+       if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_READ)
+               toi_prepare_usm();
+
+       switch (sysfs_data->type) {
+       case TOI_SYSFS_DATA_CUSTOM:
+               len = (sysfs_data->data.special.read_sysfs) ?
+                       (sysfs_data->data.special.read_sysfs)(page, PAGE_SIZE)
+                       : 0;
+               break;
+       case TOI_SYSFS_DATA_BIT:
+               len = sprintf(page, "%d\n",
+                       -test_bit(sysfs_data->data.bit.bit,
+                               sysfs_data->data.bit.bit_vector));
+               break;
+       case TOI_SYSFS_DATA_INTEGER:
+               len = sprintf(page, "%d\n",
+                       *(sysfs_data->data.integer.variable));
+               break;
+       case TOI_SYSFS_DATA_LONG:
+               len = sprintf(page, "%ld\n",
+                       *(sysfs_data->data.a_long.variable));
+               break;
+       case TOI_SYSFS_DATA_UL:
+               len = sprintf(page, "%lu\n",
+                       *(sysfs_data->data.ul.variable));
+               break;
+       case TOI_SYSFS_DATA_STRING:
+               len = sprintf(page, "%s\n",
+                       sysfs_data->data.string.variable);
+               break;
+       }
+       /* Side effect routine? */
+       if (sysfs_data->read_side_effect)
+               sysfs_data->read_side_effect();
+
+       if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_READ)
+               toi_cleanup_usm();
+
+       toi_finish_anything(0);
+
+       return len;
+}
+
+#define BOUND(_variable, _type) \
+       do { \
+       if (*_variable < sysfs_data->data._type.minimum) \
+               *_variable = sysfs_data->data._type.minimum; \
+       else if (*_variable > sysfs_data->data._type.maximum) \
+               *_variable = sysfs_data->data._type.maximum; \
+       } while (0)
+
+static ssize_t toi_attr_store(struct kobject *kobj, struct attribute *attr,
+               const char *my_buf, size_t count)
+{
+       int assigned_temp_buffer = 0, result = count;
+       struct toi_sysfs_data *sysfs_data = to_sysfs_data(attr);
+
+       if (toi_start_anything((sysfs_data->flags & SYSFS_HIBERNATE_OR_RESUME)))
+               return -EBUSY;
+
+       ((char *) my_buf)[count] = 0;
+
+       if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_WRITE)
+               toi_prepare_usm();
+
+       switch (sysfs_data->type) {
+       case TOI_SYSFS_DATA_CUSTOM:
+               if (sysfs_data->data.special.write_sysfs)
+                       result = (sysfs_data->data.special.write_sysfs)(my_buf,
+                                       count);
+               break;
+       case TOI_SYSFS_DATA_BIT:
+               {
+               int value = simple_strtoul(my_buf, NULL, 0);
+               if (value)
+                       set_bit(sysfs_data->data.bit.bit,
+                               (sysfs_data->data.bit.bit_vector));
+               else
+                       clear_bit(sysfs_data->data.bit.bit,
+                               (sysfs_data->data.bit.bit_vector));
+               }
+               break;
+       case TOI_SYSFS_DATA_INTEGER:
+               {
+                       int *variable =
+                               sysfs_data->data.integer.variable;
+                       *variable = simple_strtol(my_buf, NULL, 0);
+                       BOUND(variable, integer);
+                       break;
+               }
+       case TOI_SYSFS_DATA_LONG:
+               {
+                       long *variable =
+                               sysfs_data->data.a_long.variable;
+                       *variable = simple_strtol(my_buf, NULL, 0);
+                       BOUND(variable, a_long);
+                       break;
+               }
+       case TOI_SYSFS_DATA_UL:
+               {
+                       unsigned long *variable =
+                               sysfs_data->data.ul.variable;
+                       *variable = simple_strtoul(my_buf, NULL, 0);
+                       BOUND(variable, ul);
+                       break;
+               }
+               break;
+       case TOI_SYSFS_DATA_STRING:
+               {
+                       int copy_len = count;
+                       char *variable =
+                               sysfs_data->data.string.variable;
+
+                       if (sysfs_data->data.string.max_length &&
+                           (copy_len > sysfs_data->data.string.max_length))
+                               copy_len = sysfs_data->data.string.max_length;
+
+                       if (!variable) {
+                               variable = (char *) toi_get_zeroed_page(31,
+                                               TOI_ATOMIC_GFP);
+                               sysfs_data->data.string.variable = variable;
+                               assigned_temp_buffer = 1;
+                       }
+                       strncpy(variable, my_buf, copy_len);
+                       if (copy_len && my_buf[copy_len - 1] == '\n')
+                               variable[count - 1] = 0;
+                       variable[count] = 0;
+               }
+               break;
+       }
+
+       /* Side effect routine? */
+       if (sysfs_data->write_side_effect)
+               sysfs_data->write_side_effect();
+
+       /* Free temporary buffers */
+       if (assigned_temp_buffer) {
+               toi_free_page(31,
+                       (unsigned long) sysfs_data->data.string.variable);
+               sysfs_data->data.string.variable = NULL;
+       }
+
+       if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_WRITE)
+               toi_cleanup_usm();
+
+       toi_finish_anything(sysfs_data->flags & SYSFS_HIBERNATE_OR_RESUME);
+
+       return result;
+}
+
+static struct sysfs_ops toi_sysfs_ops = {
+       .show   = &toi_attr_show,
+       .store  = &toi_attr_store,
+};
+
+static struct kobj_type toi_ktype = {
+       .sysfs_ops      = &toi_sysfs_ops,
+};
+
+struct kobject *tuxonice_kobj;
+
+/* Non-module sysfs entries.
+ *
+ * This array contains entries that are automatically registered at
+ * boot. Modules and the console code register their own entries separately.
+ *
+ * NB: If you move do_hibernate, change toi_write_sysfs's test so that
+ * toi_start_anything still gets a 1 when the user echos > do_hibernate!
+ */
+
+static struct toi_sysfs_data sysfs_params[] = {
+       { TOI_ATTR("do_hibernate", SYSFS_WRITEONLY),
+         SYSFS_CUSTOM(NULL, NULL, SYSFS_HIBERNATING),
+         .write_side_effect = toi_main_wrapper
+       },
+
+       { TOI_ATTR("do_resume", SYSFS_WRITEONLY),
+         SYSFS_CUSTOM(NULL, NULL, SYSFS_RESUMING),
+         .write_side_effect = __toi_try_resume
+       },
+
+};
+
+void remove_toi_sysdir(struct kobject *kobj)
+{
+       if (!kobj)
+               return;
+
+       kobject_put(kobj);
+}
+
+struct kobject *make_toi_sysdir(char *name)
+{
+       struct kobject *kobj = kobject_create_and_add(name, tuxonice_kobj);
+
+       if (!kobj) {
+               printk(KERN_INFO "TuxOnIce: Can't allocate kobject for sysfs "
+                               "dir!\n");
+               return NULL;
+       }
+
+       kobj->ktype = &toi_ktype;
+
+       return kobj;
+}
+
+/* toi_register_sysfs_file
+ *
+ * Helper for registering a new /sysfs/tuxonice entry.
+ */
+
+int toi_register_sysfs_file(
+               struct kobject *kobj,
+               struct toi_sysfs_data *toi_sysfs_data)
+{
+       int result;
+
+       if (!toi_sysfs_initialised)
+               toi_initialise_sysfs();
+
+       result = sysfs_create_file(kobj, &toi_sysfs_data->attr);
+       if (result)
+               printk(KERN_INFO "TuxOnIce: sysfs_create_file for %s "
+                       "returned %d.\n",
+                       toi_sysfs_data->attr.name, result);
+       kobj->ktype = &toi_ktype;
+
+       return result;
+}
+EXPORT_SYMBOL_GPL(toi_register_sysfs_file);
+
+/* toi_unregister_sysfs_file
+ *
+ * Helper for removing unwanted /sys/power/tuxonice entries.
+ *
+ */
+void toi_unregister_sysfs_file(struct kobject *kobj,
+               struct toi_sysfs_data *toi_sysfs_data)
+{
+       sysfs_remove_file(kobj, &toi_sysfs_data->attr);
+}
+EXPORT_SYMBOL_GPL(toi_unregister_sysfs_file);
+
+void toi_cleanup_sysfs(void)
+{
+       int i,
+           numfiles = sizeof(sysfs_params) / sizeof(struct toi_sysfs_data);
+
+       if (!toi_sysfs_initialised)
+               return;
+
+       for (i = 0; i < numfiles; i++)
+               toi_unregister_sysfs_file(tuxonice_kobj, &sysfs_params[i]);
+
+       kobject_put(tuxonice_kobj);
+       toi_sysfs_initialised = 0;
+}
+
+/* toi_initialise_sysfs
+ *
+ * Initialise the /sysfs/tuxonice directory.
+ */
+
+static void toi_initialise_sysfs(void)
+{
+       int i;
+       int numfiles = sizeof(sysfs_params) / sizeof(struct toi_sysfs_data);
+
+       if (toi_sysfs_initialised)
+               return;
+
+       /* Make our TuxOnIce directory a child of /sys/power */
+       tuxonice_kobj = kobject_create_and_add("tuxonice", power_kobj);
+       if (!tuxonice_kobj)
+               return;
+
+       toi_sysfs_initialised = 1;
+
+       for (i = 0; i < numfiles; i++)
+               toi_register_sysfs_file(tuxonice_kobj, &sysfs_params[i]);
+}
+
+int toi_sysfs_init(void)
+{
+       toi_initialise_sysfs();
+       return 0;
+}
+
+void toi_sysfs_exit(void)
+{
+       toi_cleanup_sysfs();
+}
diff --git a/kernel/power/tuxonice_sysfs.h b/kernel/power/tuxonice_sysfs.h
new file mode 100644
index 0000000..bf56414
--- /dev/null
+++ b/kernel/power/tuxonice_sysfs.h
@@ -0,0 +1,127 @@
+/*
+ * kernel/power/tuxonice_sysfs.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/sysfs.h>
+#include "power.h"
+
+struct toi_sysfs_data {
+       struct attribute attr;
+       int type;
+       int flags;
+       union {
+               struct {
+                       unsigned long *bit_vector;
+                       int bit;
+               } bit;
+               struct {
+                       int *variable;
+                       int minimum;
+                       int maximum;
+               } integer;
+               struct {
+                       long *variable;
+                       long minimum;
+                       long maximum;
+               } a_long;
+               struct {
+                       unsigned long *variable;
+                       unsigned long minimum;
+                       unsigned long maximum;
+               } ul;
+               struct {
+                       char *variable;
+                       int max_length;
+               } string;
+               struct {
+                       int (*read_sysfs) (const char *buffer, int count);
+                       int (*write_sysfs) (const char *buffer, int count);
+                       void *data;
+               } special;
+       } data;
+
+       /* Side effects routines. Used, eg, for reparsing the
+        * resume= entry when it changes */
+       void (*read_side_effect) (void);
+       void (*write_side_effect) (void);
+       struct list_head sysfs_data_list;
+};
+
+enum {
+       TOI_SYSFS_DATA_NONE = 1,
+       TOI_SYSFS_DATA_CUSTOM,
+       TOI_SYSFS_DATA_BIT,
+       TOI_SYSFS_DATA_INTEGER,
+       TOI_SYSFS_DATA_UL,
+       TOI_SYSFS_DATA_LONG,
+       TOI_SYSFS_DATA_STRING
+};
+
+#define TOI_ATTR(_name, _mode)      \
+       .attr = {.name  = _name , .mode   = _mode }
+
+#define SYSFS_BIT(_ul, _bit, _flags) \
+       .type = TOI_SYSFS_DATA_BIT, \
+       .flags = _flags, \
+       .data = { .bit = { .bit_vector = _ul, .bit = _bit } }
+
+#define SYSFS_INT(_int, _min, _max, _flags) \
+       .type = TOI_SYSFS_DATA_INTEGER, \
+       .flags = _flags, \
+       .data = { .integer = { .variable = _int, .minimum = _min, \
+                       .maximum = _max } }
+
+#define SYSFS_UL(_ul, _min, _max, _flags) \
+       .type = TOI_SYSFS_DATA_UL, \
+       .flags = _flags, \
+       .data = { .ul = { .variable = _ul, .minimum = _min, \
+                       .maximum = _max } }
+
+#define SYSFS_LONG(_long, _min, _max, _flags) \
+       .type = TOI_SYSFS_DATA_LONG, \
+       .flags = _flags, \
+       .data = { .a_long = { .variable = _long, .minimum = _min, \
+                       .maximum = _max } }
+
+#define SYSFS_STRING(_string, _max_len, _flags) \
+       .type = TOI_SYSFS_DATA_STRING, \
+       .flags = _flags, \
+       .data = { .string = { .variable = _string, .max_length = _max_len } }
+
+#define SYSFS_CUSTOM(_read, _write, _flags) \
+       .type = TOI_SYSFS_DATA_CUSTOM, \
+       .flags = _flags, \
+       .data = { .special = { .read_sysfs = _read, .write_sysfs = _write } }
+
+#define SYSFS_WRITEONLY 0200
+#define SYSFS_READONLY 0444
+#define SYSFS_RW 0644
+
+/* Flags */
+#define SYSFS_NEEDS_SM_FOR_READ 1
+#define SYSFS_NEEDS_SM_FOR_WRITE 2
+#define SYSFS_HIBERNATE 4
+#define SYSFS_RESUME 8
+#define SYSFS_HIBERNATE_OR_RESUME (SYSFS_HIBERNATE | SYSFS_RESUME)
+#define SYSFS_HIBERNATING (SYSFS_HIBERNATE | SYSFS_NEEDS_SM_FOR_WRITE)
+#define SYSFS_RESUMING (SYSFS_RESUME | SYSFS_NEEDS_SM_FOR_WRITE)
+#define SYSFS_NEEDS_SM_FOR_BOTH \
+ (SYSFS_NEEDS_SM_FOR_READ | SYSFS_NEEDS_SM_FOR_WRITE)
+
+int toi_register_sysfs_file(struct kobject *kobj,
+               struct toi_sysfs_data *toi_sysfs_data);
+void toi_unregister_sysfs_file(struct kobject *kobj,
+               struct toi_sysfs_data *toi_sysfs_data);
+
+extern struct kobject *tuxonice_kobj;
+
+struct kobject *make_toi_sysdir(char *name);
+void remove_toi_sysdir(struct kobject *obj);
+extern void toi_cleanup_sysfs(void);
+
+extern int toi_sysfs_init(void);
+extern void toi_sysfs_exit(void);
diff --git a/kernel/power/tuxonice_ui.c b/kernel/power/tuxonice_ui.c
new file mode 100644
index 0000000..125f21e
--- /dev/null
+++ b/kernel/power/tuxonice_ui.c
@@ -0,0 +1,261 @@
+/*
+ * kernel/power/tuxonice_ui.c
+ *
+ * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
+ * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr>
+ * Copyright (C) 2002-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for TuxOnIce's user interface.
+ *
+ * The user interface code talks to a userspace program via a
+ * netlink socket.
+ *
+ * The kernel side:
+ * - starts the userui program;
+ * - sends text messages and progress bar status;
+ *
+ * The user space side:
+ * - passes messages regarding user requests (abort, toggle reboot etc)
+ *
+ */
+
+#define __KERNEL_SYSCALLS__
+
+#include <linux/reboot.h>
+
+#include "tuxonice_sysfs.h"
+#include "tuxonice_modules.h"
+#include "tuxonice.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_netlink.h"
+#include "tuxonice_power_off.h"
+#include "tuxonice_builtin.h"
+
+static char local_printf_buf[1024];    /* Same as printk - should be safe */
+struct ui_ops *toi_current_ui;
+
+/**
+ * toi_wait_for_keypress - Wait for keypress via userui or /dev/console.
+ *
+ * @timeout: Maximum time to wait.
+ *
+ * Wait for a keypress, either from userui or /dev/console if userui isn't
+ * available. The non-userui path is particularly for at boot-time, prior
+ * to userui being started, when we have an important warning to give to
+ * the user.
+ */
+static char toi_wait_for_keypress(int timeout)
+{
+       if (toi_current_ui && toi_current_ui->wait_for_key(timeout))
+               return ' ';
+
+       return toi_wait_for_keypress_dev_console(timeout);
+}
+
+/* toi_early_boot_message()
+ * Description:        Handle errors early in the process of booting.
+ *             The user may press C to continue booting, perhaps
+ *             invalidating the image,  or space to reboot.
+ *             This works from either the serial console or normally
+ *             attached keyboard.
+ *
+ *             Note that we come in here from init, while the kernel is
+ *             locked. If we want to get events from the serial console,
+ *             we need to temporarily unlock the kernel.
+ *
+ *             toi_early_boot_message may also be called post-boot.
+ *             In this case, it simply printks the message and returns.
+ *
+ * Arguments:  int     Whether we are able to erase the image.
+ *             int     default_answer. What to do when we timeout. This
+ *                     will normally be continue, but the user might
+ *                     provide command line options (__setup) to override
+ *                     particular cases.
+ *             Char *. Pointer to a string explaining why we're moaning.
+ */
+
+#define say(message, a...) printk(KERN_EMERG message, ##a)
+
+void toi_early_boot_message(int message_detail, int default_answer,
+       char *warning_reason, ...)
+{
+#if defined(CONFIG_VT) || defined(CONFIG_SERIAL_CONSOLE)
+       unsigned long orig_state = get_toi_state(), continue_req = 0;
+       unsigned long orig_loglevel = console_loglevel;
+       int can_ask = 1;
+#else
+       int can_ask = 0;
+#endif
+
+       va_list args;
+       int printed_len;
+
+       if (!toi_wait) {
+               set_toi_state(TOI_CONTINUE_REQ);
+               can_ask = 0;
+       }
+
+       if (warning_reason) {
+               va_start(args, warning_reason);
+               printed_len = vsnprintf(local_printf_buf,
+                               sizeof(local_printf_buf),
+                               warning_reason,
+                               args);
+               va_end(args);
+       }
+
+       if (!test_toi_state(TOI_BOOT_TIME)) {
+               printk("TuxOnIce: %s\n", local_printf_buf);
+               return;
+       }
+
+       if (!can_ask) {
+               continue_req = !!default_answer;
+               goto post_ask;
+       }
+
+#if defined(CONFIG_VT) || defined(CONFIG_SERIAL_CONSOLE)
+       console_loglevel = 7;
+
+       say("=== TuxOnIce ===\n\n");
+       if (warning_reason) {
+               say("BIG FAT WARNING!! %s\n\n", local_printf_buf);
+               switch (message_detail) {
+               case 0:
+                       say("If you continue booting, note that any image WILL"
+                               "NOT BE REMOVED.\nTuxOnIce is unable to do so "
+                               "because the appropriate modules aren't\n"
+                               "loaded. You should manually remove the image "
+                               "to avoid any\npossibility of corrupting your "
+                               "filesystem(s) later.\n");
+                       break;
+               case 1:
+                       say("If you want to use the current TuxOnIce image, "
+                               "reboot and try\nagain with the same kernel "
+                               "that you hibernated from. If you want\n"
+                               "to forget that image, continue and the image "
+                               "will be erased.\n");
+                       break;
+               }
+               say("Press SPACE to reboot or C to continue booting with "
+                       "this kernel\n\n");
+               if (toi_wait > 0)
+                       say("Default action if you don't select one in %d "
+                               "seconds is: %s.\n",
+                               toi_wait,
+                               default_answer == TOI_CONTINUE_REQ ?
+                               "continue booting" : "reboot");
+       } else {
+               say("BIG FAT WARNING!!\n\n"
+                       "You have tried to resume from this image before.\n"
+                       "If it failed once, it may well fail again.\n"
+                       "Would you like to remove the image and boot "
+                       "normally?\nThis will be equivalent to entering "
+                       "noresume on the\nkernel command line.\n\n"
+                       "Press SPACE to remove the image or C to continue "
+                       "resuming.\n\n");
+               if (toi_wait > 0)
+                       say("Default action if you don't select one in %d "
+                               "seconds is: %s.\n", toi_wait,
+                               !!default_answer ?
+                               "continue resuming" : "remove the image");
+       }
+       console_loglevel = orig_loglevel;
+
+       set_toi_state(TOI_SANITY_CHECK_PROMPT);
+       clear_toi_state(TOI_CONTINUE_REQ);
+
+       if (toi_wait_for_keypress(toi_wait) == 0) /* We timed out */
+               continue_req = !!default_answer;
+       else
+               continue_req = test_toi_state(TOI_CONTINUE_REQ);
+
+#endif /* CONFIG_VT or CONFIG_SERIAL_CONSOLE */
+
+post_ask:
+       if ((warning_reason) && (!continue_req))
+               machine_restart(NULL);
+
+       restore_toi_state(orig_state);
+       if (continue_req)
+               set_toi_state(TOI_CONTINUE_REQ);
+}
+#undef say
+
+/*
+ * User interface specific /sys/power/tuxonice entries.
+ */
+
+static struct toi_sysfs_data sysfs_params[] = {
+#if defined(CONFIG_NET) && defined(CONFIG_SYSFS)
+       { TOI_ATTR("default_console_level", SYSFS_RW),
+         SYSFS_INT(&toi_bkd.toi_default_console_level, 0, 7, 0)
+       },
+
+       { TOI_ATTR("debug_sections", SYSFS_RW),
+         SYSFS_UL(&toi_bkd.toi_debug_state, 0, 1 << 30, 0)
+       },
+
+       { TOI_ATTR("log_everything", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_LOGALL, 0)
+       },
+#endif
+       { TOI_ATTR("pm_prepare_console", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_PM_PREPARE_CONSOLE, 0)
+       }
+};
+
+static struct toi_module_ops userui_ops = {
+       .type                           = MISC_HIDDEN_MODULE,
+       .name                           = "printk ui",
+       .directory                      = "user_interface",
+       .module                         = THIS_MODULE,
+       .sysfs_data                     = sysfs_params,
+       .num_sysfs_entries              = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+int toi_register_ui_ops(struct ui_ops *this_ui)
+{
+       if (toi_current_ui) {
+               printk(KERN_INFO "Only one TuxOnIce user interface module can "
+                               "be loaded at a time.");
+               return -EBUSY;
+       }
+
+       toi_current_ui = this_ui;
+
+       return 0;
+}
+
+void toi_remove_ui_ops(struct ui_ops *this_ui)
+{
+       if (toi_current_ui != this_ui)
+               return;
+
+       toi_current_ui = NULL;
+}
+
+/* toi_console_sysfs_init
+ * Description: Boot time initialisation for user interface.
+ */
+
+int toi_ui_init(void)
+{
+       return toi_register_module(&userui_ops);
+}
+
+void toi_ui_exit(void)
+{
+       toi_unregister_module(&userui_ops);
+}
+
+#ifdef CONFIG_TOI_EXPORTS
+EXPORT_SYMBOL_GPL(toi_current_ui);
+EXPORT_SYMBOL_GPL(toi_early_boot_message);
+EXPORT_SYMBOL_GPL(toi_register_ui_ops);
+EXPORT_SYMBOL_GPL(toi_remove_ui_ops);
+#endif
diff --git a/kernel/power/tuxonice_ui.h b/kernel/power/tuxonice_ui.h
new file mode 100644
index 0000000..7825ddf
--- /dev/null
+++ b/kernel/power/tuxonice_ui.h
@@ -0,0 +1,104 @@
+/*
+ * kernel/power/tuxonice_ui.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at tuxonice net)
+ */
+
+enum {
+       DONT_CLEAR_BAR,
+       CLEAR_BAR
+};
+
+enum {
+       /* Userspace -> Kernel */
+       USERUI_MSG_ABORT = 0x11,
+       USERUI_MSG_SET_STATE = 0x12,
+       USERUI_MSG_GET_STATE = 0x13,
+       USERUI_MSG_GET_DEBUG_STATE = 0x14,
+       USERUI_MSG_SET_DEBUG_STATE = 0x15,
+       USERUI_MSG_SPACE = 0x18,
+       USERUI_MSG_GET_POWERDOWN_METHOD = 0x1A,
+       USERUI_MSG_SET_POWERDOWN_METHOD = 0x1B,
+       USERUI_MSG_GET_LOGLEVEL = 0x1C,
+       USERUI_MSG_SET_LOGLEVEL = 0x1D,
+       USERUI_MSG_PRINTK = 0x1E,
+
+       /* Kernel -> Userspace */
+       USERUI_MSG_MESSAGE = 0x21,
+       USERUI_MSG_PROGRESS = 0x22,
+       USERUI_MSG_POST_ATOMIC_RESTORE = 0x25,
+
+       USERUI_MSG_MAX,
+};
+
+struct userui_msg_params {
+       unsigned long a, b, c, d;
+       char text[255];
+};
+
+struct ui_ops {
+       char (*wait_for_key) (int timeout);
+       unsigned long (*update_status) (unsigned long value,
+               unsigned long maximum, const char *fmt, ...);
+       void (*prepare_status) (int clearbar, const char *fmt, ...);
+       void (*cond_pause) (int pause, char *message);
+       void (*abort)(int result_code, const char *fmt, ...);
+       void (*prepare)(void);
+       void (*cleanup)(void);
+       void (*post_atomic_restore)(void);
+       void (*message)(unsigned long section, unsigned long level,
+               int normally_logged, const char *fmt, ...);
+};
+
+extern struct ui_ops *toi_current_ui;
+
+#define toi_update_status(val, max, fmt, args...) \
+ (toi_current_ui ? (toi_current_ui->update_status) (val, max, fmt, ##args) : \
+       max)
+
+#define toi_ui_post_atomic_restore(void) \
+       do { if (toi_current_ui) \
+               (toi_current_ui->post_atomic_restore)(); \
+       } while (0)
+
+#define toi_prepare_console(void) \
+       do { if (toi_current_ui) \
+               (toi_current_ui->prepare)(); \
+       } while (0)
+
+#define toi_cleanup_console(void) \
+       do { if (toi_current_ui) \
+               (toi_current_ui->cleanup)(); \
+       } while (0)
+
+#define abort_hibernate(result, fmt, args...) \
+       do { if (toi_current_ui) \
+               (toi_current_ui->abort)(result, fmt, ##args); \
+            else { \
+               set_abort_result(result); \
+            } \
+       } while (0)
+
+#define toi_cond_pause(pause, message) \
+       do { if (toi_current_ui) \
+               (toi_current_ui->cond_pause)(pause, message); \
+       } while (0)
+
+#define toi_prepare_status(clear, fmt, args...) \
+       do { if (toi_current_ui) \
+               (toi_current_ui->prepare_status)(clear, fmt, ##args); \
+            else \
+               printk(KERN_ERR fmt "%s", ##args, "\n"); \
+       } while (0)
+
+#define toi_message(sn, lev, log, fmt, a...) \
+do { \
+       if (toi_current_ui && (!sn || test_debug_state(sn))) \
+               toi_current_ui->message(sn, lev, log, fmt, ##a); \
+} while (0)
+
+__exit void toi_ui_cleanup(void);
+extern int toi_ui_init(void);
+extern void toi_ui_exit(void);
+extern int toi_register_ui_ops(struct ui_ops *this_ui);
+extern void toi_remove_ui_ops(struct ui_ops *this_ui);
diff --git a/kernel/power/tuxonice_userui.c b/kernel/power/tuxonice_userui.c
new file mode 100644
index 0000000..3454709
--- /dev/null
+++ b/kernel/power/tuxonice_userui.c
@@ -0,0 +1,675 @@
+/*
+ * kernel/power/user_ui.c
+ *
+ * Copyright (C) 2005-2007 Bernard Blackham
+ * Copyright (C) 2002-2007 Nigel Cunningham (nigel at tuxonice net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for TuxOnIce's user interface.
+ *
+ * The user interface code talks to a userspace program via a
+ * netlink socket.
+ *
+ * The kernel side:
+ * - starts the userui program;
+ * - sends text messages and progress bar status;
+ *
+ * The user space side:
+ * - passes messages regarding user requests (abort, toggle reboot etc)
+ *
+ */
+
+#define __KERNEL_SYSCALLS__
+
+#include <linux/suspend.h>
+#include <linux/freezer.h>
+#include <linux/console.h>
+#include <linux/ctype.h>
+#include <linux/tty.h>
+#include <linux/vt_kern.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/kmod.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+
+#include "tuxonice_sysfs.h"
+#include "tuxonice_modules.h"
+#include "tuxonice.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_netlink.h"
+#include "tuxonice_power_off.h"
+
+static char local_printf_buf[1024];    /* Same as printk - should be safe */
+
+static struct user_helper_data ui_helper_data;
+static struct toi_module_ops userui_ops;
+static int orig_kmsg;
+
+static char lastheader[512];
+static int lastheader_message_len;
+static int ui_helper_changed; /* Used at resume-time so don't overwrite value
+                               set from initrd/ramfs. */
+
+/* Number of distinct progress amounts that userspace can display */
+static int progress_granularity = 30;
+
+static DECLARE_WAIT_QUEUE_HEAD(userui_wait_for_key);
+
+/**
+ * ui_nl_set_state - Update toi_action based on a message from userui.
+ *
+ * @n: The bit (1 << bit) to set.
+ */
+static void ui_nl_set_state(int n)
+{
+       /* Only let them change certain settings */
+       static const int toi_action_mask =
+               (1 << TOI_REBOOT) | (1 << TOI_PAUSE) |
+               (1 << TOI_LOGALL) |
+               (1 << TOI_SINGLESTEP) |
+               (1 << TOI_PAUSE_NEAR_PAGESET_END);
+
+       toi_bkd.toi_action = (toi_bkd.toi_action & (~toi_action_mask)) |
+               (n & toi_action_mask);
+
+       if (!test_action_state(TOI_PAUSE) &&
+                       !test_action_state(TOI_SINGLESTEP))
+               wake_up_interruptible(&userui_wait_for_key);
+}
+
+/**
+ * userui_post_atomic_restore - Tell userui that atomic restore just happened.
+ *
+ * Tell userui that atomic restore just occured, so that it can do things like
+ * redrawing the screen, re-getting settings and so on.
+ */
+static void userui_post_atomic_restore(void)
+{
+       toi_send_netlink_message(&ui_helper_data,
+                       USERUI_MSG_POST_ATOMIC_RESTORE, NULL, 0);
+}
+
+/**
+ * userui_storage_needed - Report how much memory in image header is needed.
+ */
+static int userui_storage_needed(void)
+{
+       return sizeof(ui_helper_data.program) + 1 + sizeof(int);
+}
+
+/**
+ * userui_save_config_info - Fill buffer with config info for image header.
+ *
+ * @buf: Buffer into which to put the config info we want to save.
+ */
+static int userui_save_config_info(char *buf)
+{
+       *((int *) buf) = progress_granularity;
+       memcpy(buf + sizeof(int), ui_helper_data.program,
+                       sizeof(ui_helper_data.program));
+       return sizeof(ui_helper_data.program) + sizeof(int) + 1;
+}
+
+/**
+ * userui_load_config_info - Restore config info from buffer.
+ *
+ * @buf: Buffer containing header info loaded.
+ * @size: Size of data loaded for this module.
+ */
+static void userui_load_config_info(char *buf, int size)
+{
+       progress_granularity = *((int *) buf);
+       size -= sizeof(int);
+
+       /* Don't load the saved path if one has already been set */
+       if (ui_helper_changed)
+               return;
+
+       if (size > sizeof(ui_helper_data.program))
+               size = sizeof(ui_helper_data.program);
+
+       memcpy(ui_helper_data.program, buf + sizeof(int), size);
+       ui_helper_data.program[sizeof(ui_helper_data.program)-1] = '\0';
+}
+
+/**
+ * set_ui_program_set: Record that userui program was changed.
+ *
+ * Side effect routine for when the userui program is set. In an initrd or
+ * ramfs, the user may set a location for the userui program. If this happens,
+ * we don't want to reload the value that was saved in the image header. This
+ * routine allows us to flag that we shouldn't restore the program name from
+ * the image header.
+ */
+static void set_ui_program_set(void)
+{
+       ui_helper_changed = 1;
+}
+
+/**
+ * userui_memory_needed - Tell core how much memory to reserve for us.
+ */
+static int userui_memory_needed(void)
+{
+       /* ball park figure of 128 pages */
+       return (128 * PAGE_SIZE);
+}
+
+/**
+ * userui_update_status - Update the progress bar and (if on) in-bar message.
+ *
+ * @value: Current progress percentage numerator.
+ * @maximum: Current progress percentage denominator.
+ * @fmt: Message to be displayed in the middle of the progress bar.
+ *
+ * Note that a NULL message does not mean that any previous message is erased!
+ * For that, you need toi_prepare_status with clearbar on.
+ *
+ * Returns an unsigned long, being the next numerator (as determined by the
+ * maximum and progress granularity) where status needs to be updated.
+ * This is to reduce unnecessary calls to update_status.
+ */
+static unsigned long userui_update_status(unsigned long value,
+               unsigned long maximum, const char *fmt, ...)
+{
+       static int last_step = -1;
+       struct userui_msg_params msg;
+       int bitshift;
+       int this_step;
+       unsigned long next_update;
+
+       if (ui_helper_data.pid == -1)
+               return 0;
+
+       if ((!maximum) || (!progress_granularity))
+               return maximum;
+
+       if (value < 0)
+               value = 0;
+
+       if (value > maximum)
+               value = maximum;
+
+       /* Try to avoid math problems - we can't do 64 bit math here
+        * (and shouldn't need it - anyone got screen resolution
+        * of 65536 pixels or more?) */
+       bitshift = fls(maximum) - 16;
+       if (bitshift > 0) {
+               unsigned long temp_maximum = maximum >> bitshift;
+               unsigned long temp_value = value >> bitshift;
+               this_step = (int)
+                       (temp_value * progress_granularity / temp_maximum);
+               next_update = (((this_step + 1) * temp_maximum /
+                                       progress_granularity) + 1) << bitshift;
+       } else {
+               this_step = (int) (value * progress_granularity / maximum);
+               next_update = ((this_step + 1) * maximum /
+                               progress_granularity) + 1;
+       }
+
+       if (this_step == last_step)
+               return next_update;
+
+       memset(&msg, 0, sizeof(msg));
+
+       msg.a = this_step;
+       msg.b = progress_granularity;
+
+       if (fmt) {
+               va_list args;
+               va_start(args, fmt);
+               vsnprintf(msg.text, sizeof(msg.text), fmt, args);
+               va_end(args);
+               msg.text[sizeof(msg.text)-1] = '\0';
+       }
+
+       toi_send_netlink_message(&ui_helper_data, USERUI_MSG_PROGRESS,
+                       &msg, sizeof(msg));
+       last_step = this_step;
+
+       return next_update;
+}
+
+/**
+ * userui_message - Display a message without necessarily logging it.
+ *
+ * @section: Type of message. Messages can be filtered by type.
+ * @level: Degree of importance of the message. Lower values = higher priority.
+ * @normally_logged: Whether logged even if log_everything is off.
+ * @fmt: Message (and parameters).
+ *
+ * This function is intended to do the same job as printk, but without normally
+ * logging what is printed. The point is to be able to get debugging info on
+ * screen without filling the logs with "1/534. ^M 2/534^M. 3/534^M"
+ *
+ * It may be called from an interrupt context - can't sleep!
+ */
+static void userui_message(unsigned long section, unsigned long level,
+               int normally_logged, const char *fmt, ...)
+{
+       struct userui_msg_params msg;
+
+       if ((level) && (level > console_loglevel))
+               return;
+
+       memset(&msg, 0, sizeof(msg));
+
+       msg.a = section;
+       msg.b = level;
+       msg.c = normally_logged;
+
+       if (fmt) {
+               va_list args;
+               va_start(args, fmt);
+               vsnprintf(msg.text, sizeof(msg.text), fmt, args);
+               va_end(args);
+               msg.text[sizeof(msg.text)-1] = '\0';
+       }
+
+       if (test_action_state(TOI_LOGALL))
+               printk(KERN_INFO "%s\n", msg.text);
+
+       toi_send_netlink_message(&ui_helper_data, USERUI_MSG_MESSAGE,
+                       &msg, sizeof(msg));
+}
+
+/**
+ * wait_for_key_via_userui - Wait for userui to receive a keypress.
+ */
+static void wait_for_key_via_userui(void)
+{
+       DECLARE_WAITQUEUE(wait, current);
+
+       add_wait_queue(&userui_wait_for_key, &wait);
+       set_current_state(TASK_INTERRUPTIBLE);
+
+       interruptible_sleep_on(&userui_wait_for_key);
+
+       set_current_state(TASK_RUNNING);
+       remove_wait_queue(&userui_wait_for_key, &wait);
+}
+
+/**
+ * userui_prepare_status - Display high level messages.
+ *
+ * @clearbar: Whether to clear the progress bar.
+ * @fmt...: New message for the title.
+ *
+ * Prepare the 'nice display', drawing the header and version, along with the
+ * current action and perhaps also resetting the progress bar.
+ */
+static void userui_prepare_status(int clearbar, const char *fmt, ...)
+{
+       va_list args;
+
+       if (fmt) {
+               va_start(args, fmt);
+               lastheader_message_len = vsnprintf(lastheader, 512, fmt, args);
+               va_end(args);
+       }
+
+       if (clearbar)
+               toi_update_status(0, 1, NULL);
+
+       if (ui_helper_data.pid == -1)
+               printk(KERN_EMERG "%s\n", lastheader);
+       else
+               toi_message(0, TOI_STATUS, 1, lastheader, NULL);
+}
+
+/**
+ * toi_wait_for_keypress - Wait for keypress via userui.
+ *
+ * @timeout: Maximum time to wait.
+ *
+ * Wait for a keypress from userui.
+ *
+ * FIXME: Implement timeout?
+ */
+static char userui_wait_for_keypress(int timeout)
+{
+       char key = '\0';
+
+       if (ui_helper_data.pid != -1) {
+               wait_for_key_via_userui();
+               key = ' ';
+       }
+
+       return key;
+}
+
+/**
+ * userui_abort_hibernate - Abort a cycle & tell user if they didn't request it.
+ *
+ * @result_code: Reason why we're aborting (1 << bit).
+ * @fmt: Message to display if telling the user what's going on.
+ *
+ * Abort a cycle. If this wasn't at the user's request (and we're displaying
+ * output), tell the user why and wait for them to acknowledge the message.
+ */
+static void userui_abort_hibernate(int result_code, const char *fmt, ...)
+{
+       va_list args;
+       int printed_len = 0;
+
+       set_result_state(result_code);
+
+       if (test_result_state(TOI_ABORTED))
+               return;
+
+       set_result_state(TOI_ABORTED);
+
+       if (test_result_state(TOI_ABORT_REQUESTED))
+               return;
+
+       va_start(args, fmt);
+       printed_len = vsnprintf(local_printf_buf,  sizeof(local_printf_buf),
+                       fmt, args);
+       va_end(args);
+       if (ui_helper_data.pid != -1)
+               printed_len = sprintf(local_printf_buf + printed_len,
+                                       " (Press SPACE to continue)");
+
+       toi_prepare_status(CLEAR_BAR, "%s", local_printf_buf);
+
+       if (ui_helper_data.pid != -1)
+               userui_wait_for_keypress(0);
+}
+
+/**
+ * request_abort_hibernate - Abort hibernating or resuming at user request.
+ *
+ * Handle the user requesting the cancellation of a hibernation or resume by
+ * pressing escape.
+ */
+static void request_abort_hibernate(void)
+{
+       if (test_result_state(TOI_ABORT_REQUESTED))
+               return;
+
+       if (test_toi_state(TOI_NOW_RESUMING)) {
+               toi_prepare_status(CLEAR_BAR, "Escape pressed. "
+                                       "Powering down again.");
+               set_toi_state(TOI_STOP_RESUME);
+               while (!test_toi_state(TOI_IO_STOPPED))
+                       schedule();
+               if (toiActiveAllocator->mark_resume_attempted)
+                       toiActiveAllocator->mark_resume_attempted(0);
+               toi_power_down();
+       }
+
+       toi_prepare_status(CLEAR_BAR, "--- ESCAPE PRESSED :"
+                                       " ABORTING HIBERNATION ---");
+       set_abort_result(TOI_ABORT_REQUESTED);
+       wake_up_interruptible(&userui_wait_for_key);
+}
+
+/**
+ * userui_user_rcv_msg - Receive a netlink message from userui.
+ *
+ * @skb: skb received.
+ * @nlh: Netlink header received.
+ */
+static int userui_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+       int type;
+       int *data;
+
+       type = nlh->nlmsg_type;
+
+       /* A control message: ignore them */
+       if (type < NETLINK_MSG_BASE)
+               return 0;
+
+       /* Unknown message: reply with EINVAL */
+       if (type >= USERUI_MSG_MAX)
+               return -EINVAL;
+
+       /* All operations require privileges, even GET */
+       if (security_netlink_recv(skb, CAP_NET_ADMIN))
+               return -EPERM;
+
+       /* Only allow one task to receive NOFREEZE privileges */
+       if (type == NETLINK_MSG_NOFREEZE_ME && ui_helper_data.pid != -1) {
+               printk(KERN_INFO "Got NOFREEZE_ME request when "
+                       "ui_helper_data.pid is %d.\n", ui_helper_data.pid);
+               return -EBUSY;
+       }
+
+       data = (int *) NLMSG_DATA(nlh);
+
+       switch (type) {
+       case USERUI_MSG_ABORT:
+               request_abort_hibernate();
+               return 0;
+       case USERUI_MSG_GET_STATE:
+               toi_send_netlink_message(&ui_helper_data,
+                               USERUI_MSG_GET_STATE, &toi_bkd.toi_action,
+                               sizeof(toi_bkd.toi_action));
+               return 0;
+       case USERUI_MSG_GET_DEBUG_STATE:
+               toi_send_netlink_message(&ui_helper_data,
+                               USERUI_MSG_GET_DEBUG_STATE,
+                               &toi_bkd.toi_debug_state,
+                               sizeof(toi_bkd.toi_debug_state));
+               return 0;
+       case USERUI_MSG_SET_STATE:
+               if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int)))
+                       return -EINVAL;
+               ui_nl_set_state(*data);
+               return 0;
+       case USERUI_MSG_SET_DEBUG_STATE:
+               if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int)))
+                       return -EINVAL;
+               toi_bkd.toi_debug_state = (*data);
+               return 0;
+       case USERUI_MSG_SPACE:
+               wake_up_interruptible(&userui_wait_for_key);
+               return 0;
+       case USERUI_MSG_GET_POWERDOWN_METHOD:
+               toi_send_netlink_message(&ui_helper_data,
+                               USERUI_MSG_GET_POWERDOWN_METHOD,
+                               &toi_poweroff_method,
+                               sizeof(toi_poweroff_method));
+               return 0;
+       case USERUI_MSG_SET_POWERDOWN_METHOD:
+               if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int)))
+                       return -EINVAL;
+               toi_poweroff_method = (*data);
+               return 0;
+       case USERUI_MSG_GET_LOGLEVEL:
+               toi_send_netlink_message(&ui_helper_data,
+                               USERUI_MSG_GET_LOGLEVEL,
+                               &toi_bkd.toi_default_console_level,
+                               sizeof(toi_bkd.toi_default_console_level));
+               return 0;
+       case USERUI_MSG_SET_LOGLEVEL:
+               if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int)))
+                       return -EINVAL;
+               toi_bkd.toi_default_console_level = (*data);
+               return 0;
+       case USERUI_MSG_PRINTK:
+               printk((char *) data);
+               return 0;
+       }
+
+       /* Unhandled here */
+       return 1;
+}
+
+/**
+ * userui_cond_pause - Possibly pause at user request.
+ *
+ * @pause: Whether to pause or just display the message.
+ * @message: Message to display at the start of pausing.
+ *
+ * Potentially pause and wait for the user to tell us to continue. We normally
+ * only pause when @pause is set. While paused, the user can do things like
+ * changing the loglevel, toggling the display of debugging sections and such
+ * like.
+ */
+static void userui_cond_pause(int pause, char *message)
+{
+       int displayed_message = 0, last_key = 0;
+
+       while (last_key != 32 &&
+               ui_helper_data.pid != -1 &&
+               ((test_action_state(TOI_PAUSE) && pause) ||
+                (test_action_state(TOI_SINGLESTEP)))) {
+               if (!displayed_message) {
+                       toi_prepare_status(DONT_CLEAR_BAR,
+                          "%s Press SPACE to continue.%s",
+                          message ? message : "",
+                          (test_action_state(TOI_SINGLESTEP)) ?
+                          " Single step on." : "");
+                       displayed_message = 1;
+               }
+               last_key = userui_wait_for_keypress(0);
+       }
+       schedule();
+}
+
+/**
+ * userui_prepare_console - Prepare the console for use.
+ *
+ * Prepare a console for use, saving current kmsg settings and attempting to
+ * start userui. Console loglevel changes are handled by userui.
+ */
+static void userui_prepare_console(void)
+{
+       orig_kmsg = kmsg_redirect;
+       kmsg_redirect = fg_console + 1;
+
+       ui_helper_data.pid = -1;
+
+       if (!userui_ops.enabled) {
+               printk("TuxOnIce: Userui disabled.\n");
+               return;
+       }
+
+       if (*ui_helper_data.program)
+               toi_netlink_setup(&ui_helper_data);
+       else
+               printk(KERN_INFO "TuxOnIce: Userui program not configured.\n");
+}
+
+/**
+ * userui_cleanup_console - Cleanup after a cycle.
+ *
+ * Tell userui to cleanup, and restore kmsg_redirect to its original value.
+ */
+
+static void userui_cleanup_console(void)
+{
+       if (ui_helper_data.pid > -1)
+               toi_netlink_close(&ui_helper_data);
+
+       kmsg_redirect = orig_kmsg;
+}
+
+/*
+ * User interface specific /sys/power/tuxonice entries.
+ */
+
+static struct toi_sysfs_data sysfs_params[] = {
+#if defined(CONFIG_NET) && defined(CONFIG_SYSFS)
+       { TOI_ATTR("enable_escape", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_CAN_CANCEL, 0)
+       },
+
+       { TOI_ATTR("pause_between_steps", SYSFS_RW),
+         SYSFS_BIT(&toi_bkd.toi_action, TOI_PAUSE, 0)
+       },
+
+       { TOI_ATTR("enabled", SYSFS_RW),
+         SYSFS_INT(&userui_ops.enabled, 0, 1, 0)
+       },
+
+       { TOI_ATTR("progress_granularity", SYSFS_RW),
+         SYSFS_INT(&progress_granularity, 1, 2048, 0)
+       },
+
+       { TOI_ATTR("program", SYSFS_RW),
+         SYSFS_STRING(ui_helper_data.program, 255, 0),
+         .write_side_effect = set_ui_program_set,
+       },
+#endif
+};
+
+static struct toi_module_ops userui_ops = {
+       .type                           = MISC_MODULE,
+       .name                           = "userui",
+       .shared_directory               = "user_interface",
+       .module                         = THIS_MODULE,
+       .storage_needed                 = userui_storage_needed,
+       .save_config_info               = userui_save_config_info,
+       .load_config_info               = userui_load_config_info,
+       .memory_needed                  = userui_memory_needed,
+       .sysfs_data                     = sysfs_params,
+       .num_sysfs_entries              = sizeof(sysfs_params) /
+               sizeof(struct toi_sysfs_data),
+};
+
+static struct ui_ops my_ui_ops = {
+       .post_atomic_restore            = userui_post_atomic_restore,
+       .update_status                  = userui_update_status,
+       .message                        = userui_message,
+       .prepare_status                 = userui_prepare_status,
+       .abort                          = userui_abort_hibernate,
+       .cond_pause                     = userui_cond_pause,
+       .prepare                        = userui_prepare_console,
+       .cleanup                        = userui_cleanup_console,
+       .wait_for_key                   = userui_wait_for_keypress,
+};
+
+/**
+ * toi_user_ui_init - Boot time initialisation for user interface.
+ *
+ * Invoked from the core init routine.
+ */
+static __init int toi_user_ui_init(void)
+{
+       int result;
+
+       ui_helper_data.nl = NULL;
+       strncpy(ui_helper_data.program, CONFIG_TOI_USERUI_DEFAULT_PATH, 255);
+       ui_helper_data.pid = -1;
+       ui_helper_data.skb_size = sizeof(struct userui_msg_params);
+       ui_helper_data.pool_limit = 6;
+       ui_helper_data.netlink_id = NETLINK_TOI_USERUI;
+       ui_helper_data.name = "userspace ui";
+       ui_helper_data.rcv_msg = userui_user_rcv_msg;
+       ui_helper_data.interface_version = 7;
+       ui_helper_data.must_init = 0;
+       ui_helper_data.not_ready = userui_cleanup_console;
+       init_completion(&ui_helper_data.wait_for_process);
+       result = toi_register_module(&userui_ops);
+       if (!result)
+               result = toi_register_ui_ops(&my_ui_ops);
+       if (result)
+               toi_unregister_module(&userui_ops);
+
+       return result;
+}
+
+#ifdef MODULE
+/**
+ * toi_user_ui_ext - Cleanup code for if the core is unloaded.
+ */
+static __exit void toi_user_ui_exit(void)
+{
+       toi_netlink_close_complete(&ui_helper_data);
+       toi_remove_ui_ops(&my_ui_ops);
+       toi_unregister_module(&userui_ops);
+}
+
+module_init(toi_user_ui_init);
+module_exit(toi_user_ui_exit);
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("TuxOnIce Userui Support");
+MODULE_LICENSE("GPL");
+#else
+late_initcall(toi_user_ui_init);
+#endif
diff --git a/kernel/printk.c b/kernel/printk.c
index b51b156..2f4e8da 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -32,6 +32,8 @@
 #include <linux/security.h>
 #include <linux/bootmem.h>
 #include <linux/syscalls.h>
+#include <linux/jiffies.h>
+#include <linux/suspend.h>
 
 #include <asm/uaccess.h>
 
@@ -101,9 +103,12 @@ static DEFINE_SPINLOCK(logbuf_lock);
  * The indices into log_buf are not constrained to log_buf_len - they
  * must be masked before subscripting
  */
-static unsigned log_start;     /* Index into log_buf: next char to be read by syslog() */
-static unsigned con_start;     /* Index into log_buf: next char to be sent to consoles */
-static unsigned log_end;       /* Index into log_buf: most-recently-written-char + 1 */
+/* Index into log_buf: next char to be read by syslog() */
+static unsigned POSS_NOSAVE log_start;
+/* Index into log_buf: next char to be sent to consoles */
+static unsigned POSS_NOSAVE con_start;
+/* Index into log_buf: most-recently-written-char + 1 */
+static unsigned POSS_NOSAVE log_end;
 
 /*
  *     Array of consoles built from command line options (console=)
@@ -131,10 +136,11 @@ static int console_may_schedule;
 
 #ifdef CONFIG_PRINTK
 
-static char __log_buf[__LOG_BUF_LEN];
-static char *log_buf = __log_buf;
-static int log_buf_len = __LOG_BUF_LEN;
-static unsigned logged_chars; /* Number of chars produced since last read+clear operation */
+static POSS_NOSAVE char __log_buf[__LOG_BUF_LEN];
+static POSS_NOSAVE char *log_buf = __log_buf;
+static POSS_NOSAVE int log_buf_len = __LOG_BUF_LEN;
+/* Number of chars produced since last read+clear operation */
+static POSS_NOSAVE unsigned logged_chars;
 
 static int __init log_buf_len_setup(char *str)
 {
@@ -937,6 +943,7 @@ void suspend_console(void)
        acquire_console_sem();
        console_suspended = 1;
 }
+EXPORT_SYMBOL(suspend_console);
 
 void resume_console(void)
 {
@@ -945,6 +952,7 @@ void resume_console(void)
        console_suspended = 0;
        release_console_sem();
 }
+EXPORT_SYMBOL(resume_console);
 
 /**
  * acquire_console_sem - lock the console system for exclusive use.
diff --git a/kernel/timer.c b/kernel/timer.c
index 03bc7f1..d70831d 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -37,6 +37,8 @@
 #include <linux/delay.h>
 #include <linux/tick.h>
 #include <linux/kallsyms.h>
+#include <linux/notifier.h>
+#include <linux/suspend.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -1002,6 +1004,59 @@ unsigned long avenrun[3];
 
 EXPORT_SYMBOL(avenrun);
 
+#ifdef CONFIG_PM
+static unsigned long avenrun_save[3];
+/*
+ * save_avenrun - Record the values prior to starting a hibernation cycle.
+ * We do this to make the work done in hibernation invisible to userspace
+ * post-suspend. Some programs, including some MTAs, watch the load average
+ * and stop work until it lowers. Without this, they would stop working for
+ * a while post-resume, unnecessarily.
+ */
+
+static void save_avenrun(void)
+{
+       avenrun_save[0] = avenrun[0];
+       avenrun_save[1] = avenrun[1];
+       avenrun_save[2] = avenrun[2];
+}
+
+static void restore_avenrun(void)
+{
+       if (!avenrun_save[0])
+               return;
+
+       avenrun[0] = avenrun_save[0];
+       avenrun[1] = avenrun_save[1];
+       avenrun[2] = avenrun_save[2];
+
+       avenrun_save[0] = 0;
+}
+
+static int avenrun_pm_callback(struct notifier_block *nfb,
+                                       unsigned long action,
+                                       void *ignored)
+{
+       switch (action) {
+       case PM_HIBERNATION_PREPARE:
+               save_avenrun();
+               return NOTIFY_OK;
+       case PM_POST_HIBERNATION:
+               restore_avenrun();
+               return NOTIFY_OK;
+       }
+
+       return NOTIFY_DONE;
+}
+
+static void register_pm_notifier_callback(void)
+{
+       pm_notifier(avenrun_pm_callback, 0);
+}
+#else
+static inline void register_pm_notifier_callback(void) { }
+#endif
+
 /*
  * calc_load - given tick count, update the avenrun load estimates.
  * This is called while holding a write_lock on xtime_lock.
@@ -1495,6 +1550,7 @@ void __init init_timers(void)
        BUG_ON(err == NOTIFY_BAD);
        register_cpu_notifier(&timers_nb);
        open_softirq(TIMER_SOFTIRQ, run_timer_softirq);
+       register_pm_notifier_callback();
 }
 
 /**
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index c399bc1..42e7072 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -558,6 +558,29 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field
        return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags);
 }
 
+/*
+ * vsnprintf_used
+ *
+ * Functionality    : Print a string with parameters to a buffer of a
+ *                    limited size. Unlike vsnprintf, we return the number
+ *                    of bytes actually put in the buffer, not the number
+ *                    that would have been put in if it was big enough.
+ */
+int snprintf_used(char *buffer, int buffer_size, const char *fmt, ...)
+{
+       int result;
+       va_list args;
+
+       if (!buffer_size)
+               return 0;
+
+       va_start(args, fmt);
+       result = vsnprintf(buffer, buffer_size, fmt, args);
+       va_end(args);
+
+       return result > buffer_size ? buffer_size : result;
+}
+
 /**
  * vsnprintf - Format a string and place it in a buffer
  * @buf: The buffer to place the result into
diff --git a/mm/Makefile b/mm/Makefile
index da4ccf0..40d7f55 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -11,7 +11,7 @@ obj-y                 := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
                           maccess.o page_alloc.o page-writeback.o pdflush.o \
                           readahead.o swap.o truncate.o vmscan.o \
                           prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
-                          page_isolation.o mm_init.o $(mmu-y)
+                          dyn_pageflags.o page_isolation.o mm_init.o $(mmu-y)
 
 obj-$(CONFIG_PROC_PAGE_MONITOR) += pagewalk.o
 obj-$(CONFIG_BOUNCE)   += bounce.o
diff --git a/mm/dyn_pageflags.c b/mm/dyn_pageflags.c
new file mode 100644
index 0000000..30d95f0
--- /dev/null
+++ b/mm/dyn_pageflags.c
@@ -0,0 +1,801 @@
+/*
+ * lib/dyn_pageflags.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham <nigel at tuxonice net>
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for dynamically allocating and releasing bitmaps
+ * used as pseudo-pageflags.
+ *
+ * We use bitmaps, built out of order zero allocations and
+ * linked together by kzalloc'd arrays of pointers into
+ * an array that looks like...
+ *
+ *     pageflags->bitmap[node][zone_id][page_num][ul]
+ *
+ * All of this is transparent to the caller, who just uses
+ * the allocate & free routines to create/destroy bitmaps,
+ * and get/set/clear to operate on individual flags.
+ *
+ * Bitmaps can be sparse, with the individual pages only being
+ * allocated when a bit is set in the page.
+ *
+ * Memory hotplugging support is work in progress. A zone's
+ * start_pfn may change. If it does, we need to reallocate
+ * the zone bitmap, adding additional pages to the front to
+ * cover the bitmap. For simplicity, we don't shift the
+ * contents of existing pages around. The lock is only used
+ * to avoid reentrancy when resizing zones. The replacement
+ * of old data with new is done atomically. If we try to test
+ * a bit in the new area before the update is completed, we
+ * know it's zero.
+ *
+ * TuxOnIce knows the structure of these pageflags, so that
+ * it can serialise them in the image header. TODO: Make
+ * that support more generic so that TuxOnIce doesn't need
+ * to know how dyn_pageflags are stored.
+ */
+
+/* Avoid warnings in include/linux/mm.h */
+struct page;
+struct dyn_pageflags;
+int test_dynpageflag(struct dyn_pageflags *bitmap, struct page *page);
+
+#include <linux/bootmem.h>
+#include <linux/dyn_pageflags.h>
+#include <linux/module.h>
+
+static LIST_HEAD(flags_list);
+static DEFINE_SPINLOCK(flags_list_lock);
+
+static void* (*dyn_allocator)(unsigned long size, unsigned long flags);
+
+static int dyn_pageflags_debug;
+
+#define PR_DEBUG(a, b...) \
+       do { if (dyn_pageflags_debug) printk(a, ##b); } while (0)
+#define DUMP_DEBUG(bitmap) \
+       do { if (dyn_pageflags_debug) dump_pagemap(bitmap); } while (0)
+
+#if BITS_PER_LONG == 32
+#define UL_SHIFT 5
+#else
+#if BITS_PER_LONG == 64
+#define UL_SHIFT 6
+#else
+#error Bits per long not 32 or 64?
+#endif
+#endif
+
+#define BIT_NUM_MASK ((sizeof(unsigned long) << 3) - 1)
+#define PAGE_NUM_MASK (~((1 << (PAGE_SHIFT + 3)) - 1))
+#define UL_NUM_MASK (~(BIT_NUM_MASK | PAGE_NUM_MASK))
+
+/*
+ * PAGENUMBER gives the index of the page within the zone.
+ * PAGEINDEX gives the index of the unsigned long within that page.
+ * PAGEBIT gives the index of the bit within the unsigned long.
+ */
+#define PAGENUMBER(zone_offset) ((int) (zone_offset >> (PAGE_SHIFT + 3)))
+#define PAGEINDEX(zone_offset) ((int) ((zone_offset & UL_NUM_MASK) >> UL_SHIFT))
+#define PAGEBIT(zone_offset) ((int) (zone_offset & BIT_NUM_MASK))
+
+#define PAGE_UL_PTR(bitmap, node, zone_num, zone_pfn) \
+       ((bitmap[node][zone_num][PAGENUMBER(zone_pfn)])+PAGEINDEX(zone_pfn))
+
+#define pages_for_zone(zone) \
+       (DIV_ROUND_UP((zone)->spanned_pages, (PAGE_SIZE << 3)))
+
+#define pages_for_span(span) \
+       (DIV_ROUND_UP(span, PAGE_SIZE << 3))
+
+/* __maybe_unused for testing functions below */
+#define GET_BIT_AND_UL(pageflags, page) \
+       struct zone *zone = page_zone(page); \
+       unsigned long pfn = page_to_pfn(page); \
+       unsigned long zone_pfn = pfn - zone->zone_start_pfn; \
+       int node = page_to_nid(page); \
+       int zone_num = zone_idx(zone); \
+       int pagenum = PAGENUMBER(zone_pfn) + 2; \
+       int page_offset = PAGEINDEX(zone_pfn); \
+       unsigned long **zone_array = ((pageflags)->bitmap && \
+               (pageflags)->bitmap[node] && \
+               (pageflags)->bitmap[node][zone_num]) ? \
+                       (pageflags)->bitmap[node][zone_num] : NULL; \
+       unsigned long __maybe_unused *ul = (zone_array && \
+               (unsigned long) zone_array[0] <= pfn && \
+               (unsigned long) zone_array[1] >= (pagenum-2) && \
+               zone_array[pagenum]) ? zone_array[pagenum] + page_offset : \
+                 NULL; \
+       int bit __maybe_unused = PAGEBIT(zone_pfn);
+
+#define for_each_online_pgdat_zone(pgdat, zone_nr) \
+       for_each_online_pgdat(pgdat) \
+               for (zone_nr = 0; zone_nr < MAX_NR_ZONES; zone_nr++)
+
+/**
+ * dump_pagemap - Display the contents of a bitmap for debugging purposes.
+ *
+ * @pagemap: The array to be dumped.
+ */
+void dump_pagemap(struct dyn_pageflags *pagemap)
+{
+       int i = 0;
+       struct pglist_data *pgdat;
+       unsigned long ****bitmap = pagemap->bitmap;
+
+       printk(" --- Dump bitmap %p ---\n", pagemap);
+
+       printk(KERN_INFO "%p: Sparse flag = %d\n",
+                       &pagemap->sparse, pagemap->sparse);
+       printk(KERN_INFO "%p: Bitmap      = %p\n",
+                       &pagemap->bitmap, bitmap);
+
+       if (!bitmap)
+               goto out;
+
+       for_each_online_pgdat(pgdat) {
+               int node_id = pgdat->node_id, zone_nr;
+               printk(KERN_INFO "%p: Node %d => %p\n",
+                               &bitmap[node_id], node_id,
+                               bitmap[node_id]);
+               if (!bitmap[node_id])
+                       continue;
+               for (zone_nr = 0; zone_nr < MAX_NR_ZONES; zone_nr++) {
+                       printk(KERN_INFO "%p:   Zone %d => %p%s\n",
+                                       &bitmap[node_id][zone_nr], zone_nr,
+                                       bitmap[node_id][zone_nr],
+                                       bitmap[node_id][zone_nr] ? "" :
+                                               " (empty)");
+                       if (!bitmap[node_id][zone_nr])
+                               continue;
+
+                       printk(KERN_INFO "%p:     Zone start pfn  = %p\n",
+                                       &bitmap[node_id][zone_nr][0],
+                                       bitmap[node_id][zone_nr][0]);
+                       printk(KERN_INFO "%p:     Number of pages = %p\n",
+                                       &bitmap[node_id][zone_nr][1],
+                                       bitmap[node_id][zone_nr][1]);
+                       for (i = 2; i < (unsigned long) bitmap[node_id]
+                                       [zone_nr][1] + 2; i++)
+                               printk(KERN_INFO
+                                       "%p:     Page %2d         = %p\n",
+                                       &bitmap[node_id][zone_nr][i],
+                                       i - 2,
+                                       bitmap[node_id][zone_nr][i]);
+               }
+       }
+out:
+       printk(KERN_INFO " --- Dump of bitmap %p finishes\n", pagemap);
+}
+EXPORT_SYMBOL_GPL(dump_pagemap);
+
+/**
+ * clear_dyn_pageflags - Zero all pageflags in a bitmap.
+ *
+ * @pagemap: The array to be cleared.
+ *
+ * Clear an array used to store dynamically allocated pageflags.
+ */
+void clear_dyn_pageflags(struct dyn_pageflags *pagemap)
+{
+       int i = 0, zone_idx;
+       struct pglist_data *pgdat;
+       unsigned long ****bitmap = pagemap->bitmap;
+
+       for_each_online_pgdat_zone(pgdat, zone_idx) {
+               int node_id = pgdat->node_id;
+               struct zone *zone = &pgdat->node_zones[zone_idx];
+
+               if (!populated_zone(zone) ||
+                  (!bitmap[node_id] || !bitmap[node_id][zone_idx]))
+                       continue;
+
+               for (i = 2; i < pages_for_zone(zone) + 2; i++)
+                       if (bitmap[node_id][zone_idx][i])
+                               memset((bitmap[node_id][zone_idx][i]), 0,
+                                               PAGE_SIZE);
+       }
+}
+EXPORT_SYMBOL_GPL(clear_dyn_pageflags);
+
+/**
+ * Allocators.
+ *
+ * During boot time, we want to use alloc_bootmem_low. Afterwards, we want
+ * kzalloc. These routines let us do that without causing compile time warnings
+ * about mismatched sections, as would happen if we did a simple
+ * boot ? alloc_bootmem_low() : kzalloc() below.
+ */
+
+/**
+ * boot_time_allocator - Allocator used while booting.
+ *
+ * @size: Number of bytes wanted.
+ * @flags: Allocation flags (ignored here).
+ */
+static __init void *boot_time_allocator(unsigned long size, unsigned long flags)
+{
+       return alloc_bootmem_low(size);
+}
+
+/**
+ * normal_allocator - Allocator used post-boot.
+ *
+ * @size: Number of bytes wanted.
+ * @flags: Allocation flags.
+ *
+ * Allocate memory for our page flags.
+ */
+static void *normal_allocator(unsigned long size, unsigned long flags)
+{
+       if (size == PAGE_SIZE)
+               return (void *) get_zeroed_page(flags);
+       else
+               return kzalloc(size, flags);
+}
+
+/**
+ * dyn_pageflags_init - Do the earliest initialisation.
+ *
+ * Very early in the boot process, set our allocator (alloc_bootmem_low) and
+ * allocate bitmaps for slab and buddy pageflags.
+ */
+void __init dyn_pageflags_init(void)
+{
+       dyn_allocator = boot_time_allocator;
+}
+
+/**
+ * dyn_pageflags_use_kzalloc - Reset the allocator for normal use.
+ *
+ * Reset the allocator to our normal, post boot function.
+ */
+void __init dyn_pageflags_use_kzalloc(void)
+{
+       dyn_allocator = (void *) normal_allocator;
+}
+
+/**
+ * try_alloc_dyn_pageflag_part - Try to allocate a pointer array.
+ *
+ * Try to allocate a contiguous array of pointers.
+ */
+static int try_alloc_dyn_pageflag_part(int nr_ptrs, void **ptr)
+{
+       *ptr = (*dyn_allocator)(sizeof(void *) * nr_ptrs, GFP_ATOMIC);
+
+       if (*ptr)
+               return 0;
+
+       printk(KERN_INFO
+               "Error. Unable to allocate memory for dynamic pageflags.");
+       return -ENOMEM;
+}
+
+static int populate_bitmap_page(struct dyn_pageflags *pageflags, int take_lock,
+                       unsigned long **page_ptr)
+{
+       void *address;
+       unsigned long flags = 0;
+
+       if (take_lock)
+               spin_lock_irqsave(&pageflags->struct_lock, flags);
+
+       /*
+        * The page may have been allocated while we waited.
+        */
+       if (*page_ptr)
+               goto out;
+
+       address = (*dyn_allocator)(PAGE_SIZE, GFP_ATOMIC);
+
+       if (!address) {
+               PR_DEBUG("Error. Unable to allocate memory for "
+                       "dynamic pageflags page.");
+               if (pageflags)
+                       spin_unlock_irqrestore(&pageflags->struct_lock, flags);
+               return -ENOMEM;
+       }
+
+       *page_ptr = address;
+out:
+       if (take_lock)
+               spin_unlock_irqrestore(&pageflags->struct_lock, flags);
+       return 0;
+}
+
+/**
+ * resize_zone_bitmap - Resize the array of pages for a bitmap.
+ *
+ * Shrink or extend a list of pages for a zone in a bitmap, preserving
+ * existing data.
+ */
+static int resize_zone_bitmap(struct dyn_pageflags *pagemap, struct zone *zone,
+               unsigned long old_pages, unsigned long new_pages,
+               unsigned long copy_offset, int take_lock)
+{
+       unsigned long **new_ptr = NULL, ****bitmap = pagemap->bitmap;
+       int node_id = zone_to_nid(zone), zone_idx = zone_idx(zone),
+           to_copy = min(old_pages, new_pages), result = 0;
+       unsigned long **old_ptr = bitmap[node_id][zone_idx], i;
+
+       if (new_pages) {
+               if (try_alloc_dyn_pageflag_part(new_pages + 2,
+                                       (void **) &new_ptr))
+                       return -ENOMEM;
+
+               if (old_pages)
+                       memcpy(new_ptr + 2 + copy_offset, old_ptr + 2,
+                                       sizeof(unsigned long) * to_copy);
+
+               new_ptr[0] = (void *) zone->zone_start_pfn;
+               new_ptr[1] = (void *) new_pages;
+       }
+
+       /* Free/alloc bitmap pages. */
+       if (old_pages > new_pages) {
+               for (i = new_pages + 2; i < old_pages + 2; i++)
+                       if (old_ptr[i])
+                               free_page((unsigned long) old_ptr[i]);
+       } else if (!pagemap->sparse) {
+               for (i = old_pages + 2; i < new_pages + 2; i++)
+                       if (populate_bitmap_page(NULL, take_lock,
+                                       (unsigned long **) &new_ptr[i])) {
+                               result = -ENOMEM;
+                               break;
+                       }
+       }
+
+       bitmap[node_id][zone_idx] = new_ptr;
+       kfree(old_ptr);
+       return result;
+}
+
+/**
+ * check_dyn_pageflag_range - Resize a section of a dyn_pageflag array.
+ *
+ * @pagemap: The array to be worked on.
+ * @zone: The zone to get in sync with reality.
+ *
+ * Check the pagemap has correct allocations for the zone. This can be
+ * invoked when allocating a new bitmap, or for hot[un]plug, and so
+ * must deal with any disparities between zone_start_pfn/spanned_pages
+ * and what we have allocated. In addition, we must deal with the possibility
+ * of zone_start_pfn having changed.
+ */
+int check_dyn_pageflag_zone(struct dyn_pageflags *pagemap, struct zone *zone,
+               int force_free_all, int take_lock)
+{
+       int node_id = zone_to_nid(zone), zone_idx = zone_idx(zone);
+       unsigned long copy_offset = 0, old_pages, new_pages;
+       unsigned long **old_ptr = pagemap->bitmap[node_id][zone_idx];
+
+       old_pages = old_ptr ? (unsigned long) old_ptr[1] : 0;
+       new_pages = force_free_all ? 0 : pages_for_span(zone->spanned_pages);
+
+       if (old_pages == new_pages &&
+           (!old_pages || (unsigned long) old_ptr[0] == zone->zone_start_pfn))
+               return 0;
+
+       if (old_pages &&
+           (unsigned long) old_ptr[0] != zone->zone_start_pfn)
+               copy_offset = pages_for_span((unsigned long) old_ptr[0] -
+                                                       zone->zone_start_pfn);
+
+       /* New/expanded zone? */
+       return resize_zone_bitmap(pagemap, zone, old_pages, new_pages,
+                       copy_offset, take_lock);
+}
+
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
+/**
+ * dyn_pageflags_hotplug - Add pages to bitmaps for hotplugged memory.
+ *
+ * Seek to expand bitmaps for hotplugged memory. We ignore any failure.
+ * Since we handle sparse bitmaps anyway, they'll be automatically
+ * populated as needed.
+ */
+void dyn_pageflags_hotplug(struct zone *zone)
+{
+       struct dyn_pageflags *this;
+
+       list_for_each_entry(this, &flags_list, list)
+               check_dyn_pageflag_zone(this, zone, 0, 1);
+}
+#endif
+
+/**
+ * free_dyn_pageflags - Free an array of dynamically allocated pageflags.
+ *
+ * @pagemap: The array to be freed.
+ *
+ * Free a dynamically allocated pageflags bitmap.
+ */
+void free_dyn_pageflags(struct dyn_pageflags *pagemap)
+{
+       int zone_idx;
+       struct pglist_data *pgdat;
+       unsigned long flags;
+
+       DUMP_DEBUG(pagemap);
+
+       if (!pagemap->bitmap)
+               return;
+
+       for_each_online_pgdat_zone(pgdat, zone_idx)
+               check_dyn_pageflag_zone(pagemap,
+                               &pgdat->node_zones[zone_idx], 1, 1);
+
+       for_each_online_pgdat(pgdat) {
+               int i = pgdat->node_id;
+
+               if (pagemap->bitmap[i])
+                       kfree((pagemap->bitmap)[i]);
+       }
+
+       kfree(pagemap->bitmap);
+       pagemap->bitmap = NULL;
+
+       pagemap->initialised = 0;
+
+       if (!pagemap->sparse) {
+               spin_lock_irqsave(&flags_list_lock, flags);
+               list_del_init(&pagemap->list);
+               pagemap->sparse = 1;
+               spin_unlock_irqrestore(&flags_list_lock, flags);
+       }
+}
+EXPORT_SYMBOL_GPL(free_dyn_pageflags);
+
+/**
+ * allocate_dyn_pageflags - Allocate a bitmap.
+ *
+ * @pagemap: The bitmap we want to allocate.
+ * @sparse: Whether to make the array sparse.
+ *
+ * The array we're preparing. If sparse, we don't allocate the actual
+ * pages until they're needed. If not sparse, we add the bitmap to the
+ * list so that if we're supporting memory hotplugging, we can allocate
+ * new pages on hotplug events.
+ *
+ * This routine may be called directly, or indirectly when the first bit
+ * needs to be set on a previously unused bitmap.
+ */
+int allocate_dyn_pageflags(struct dyn_pageflags *pagemap, int sparse)
+{
+       int zone_idx, result = -ENOMEM;
+       struct zone *zone;
+       struct pglist_data *pgdat;
+       unsigned long flags;
+
+       if (!sparse && (pagemap->sparse || !pagemap->initialised)) {
+               spin_lock_irqsave(&flags_list_lock, flags);
+               list_add(&pagemap->list, &flags_list);
+               spin_unlock_irqrestore(&flags_list_lock, flags);
+       }
+
+       spin_lock_irqsave(&pagemap->struct_lock, flags);
+
+       pagemap->initialised = 1;
+       pagemap->sparse = sparse;
+
+       if (!pagemap->bitmap && try_alloc_dyn_pageflag_part((1 << NODES_WIDTH),
+                               (void **) &pagemap->bitmap))
+               goto out;
+
+       for_each_online_pgdat(pgdat) {
+               int node_id = pgdat->node_id;
+
+               if (!pagemap->bitmap[node_id] &&
+                   try_alloc_dyn_pageflag_part(MAX_NR_ZONES,
+                       (void **) &(pagemap->bitmap)[node_id]))
+                               goto out;
+
+               for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) {
+                       zone = &pgdat->node_zones[zone_idx];
+
+                       if (populated_zone(zone) &&
+                           check_dyn_pageflag_zone(pagemap, zone, 0, 0))
+                               goto out;
+               }
+       }
+
+       result = 0;
+
+out:
+       spin_unlock_irqrestore(&pagemap->struct_lock, flags);
+       return result;
+}
+EXPORT_SYMBOL_GPL(allocate_dyn_pageflags);
+
+/**
+ * test_dynpageflag - Test a page in a bitmap.
+ *
+ * @bitmap: The bitmap we're checking.
+ * @page: The page for which we want to test the matching bit.
+ *
+ * Test whether the bit is on in the array. The array may be sparse,
+ * in which case the result is zero.
+ */
+int test_dynpageflag(struct dyn_pageflags *bitmap, struct page *page)
+{
+       GET_BIT_AND_UL(bitmap, page);
+       return ul ? test_bit(bit, ul) : 0;
+}
+EXPORT_SYMBOL_GPL(test_dynpageflag);
+
+/**
+ * set_dynpageflag - Set a bit in a bitmap.
+ *
+ * @bitmap: The bitmap we're operating on.
+ * @page: The page for which we want to set the matching bit.
+ *
+ * Set the associated bit in the array. If the array is sparse, we
+ * seek to allocate the missing page.
+ */
+void set_dynpageflag(struct dyn_pageflags *pageflags, struct page *page)
+{
+       GET_BIT_AND_UL(pageflags, page);
+
+       if (!ul) {
+               /*
+                * Sparse, hotplugged or unprepared.
+                * Allocate / fill gaps in high levels
+                */
+               if (allocate_dyn_pageflags(pageflags, 1) ||
+                   populate_bitmap_page(pageflags, 1, (unsigned long **)
+                               &pageflags->bitmap[node][zone_num][pagenum])) {
+                       printk(KERN_EMERG "Failed to allocate storage in a "
+                                       "sparse bitmap.\n");
+                       dump_pagemap(pageflags);
+                       BUG();
+               }
+               set_dynpageflag(pageflags, page);
+       } else
+               set_bit(bit, ul);
+}
+EXPORT_SYMBOL_GPL(set_dynpageflag);
+
+/**
+ * clear_dynpageflag - Clear a bit in a bitmap.
+ *
+ * @bitmap: The bitmap we're operating on.
+ * @page: The page for which we want to clear the matching bit.
+ *
+ * Clear the associated bit in the array. It is not an error to be asked
+ * to clear a bit on a page we haven't allocated.
+ */
+void clear_dynpageflag(struct dyn_pageflags *bitmap, struct page *page)
+{
+       GET_BIT_AND_UL(bitmap, page);
+       if (ul)
+               clear_bit(bit, ul);
+}
+EXPORT_SYMBOL_GPL(clear_dynpageflag);
+
+/**
+ * get_next_bit_on - Get the next bit in a bitmap.
+ *
+ * @pageflags: The bitmap we're searching.
+ * @counter: The previous pfn. We always return a value > this.
+ *
+ * Given a pfn (possibly max_pfn+1), find the next pfn in the bitmap that
+ * is set. If there are no more flags set, return max_pfn+1.
+ */
+unsigned long get_next_bit_on(struct dyn_pageflags *pageflags,
+               unsigned long counter)
+{
+       struct page *page;
+       struct zone *zone;
+       unsigned long *ul = NULL;
+       unsigned long zone_offset;
+       int pagebit, zone_num, first = (counter == (max_pfn + 1)), node;
+
+       if (first)
+               counter = first_online_pgdat()->node_zones->zone_start_pfn;
+
+       page = pfn_to_page(counter);
+       zone = page_zone(page);
+       node = zone->zone_pgdat->node_id;
+       zone_num = zone_idx(zone);
+       zone_offset = counter - zone->zone_start_pfn;
+
+       if (first)
+               goto test;
+
+       do {
+               zone_offset++;
+
+               if (zone_offset >= zone->spanned_pages) {
+                       do {
+                               zone = next_zone(zone);
+                               if (!zone)
+                                       return max_pfn + 1;
+                       } while (!zone->spanned_pages);
+
+                       zone_num = zone_idx(zone);
+                       node = zone->zone_pgdat->node_id;
+                       zone_offset = 0;
+               }
+test:
+               pagebit = PAGEBIT(zone_offset);
+
+               if (!pagebit || !ul) {
+                       ul = pageflags->bitmap[node][zone_num]
+                               [PAGENUMBER(zone_offset)+2];
+                       if (ul)
+                               ul += PAGEINDEX(zone_offset);
+                       else {
+                               PR_DEBUG("Unallocated page. Skipping from zone"
+                                       " offset %lu to the start of the next "
+                                       "one.\n", zone_offset);
+                               zone_offset = roundup(zone_offset + 1,
+                                               PAGE_SIZE << 3) - 1;
+                               PR_DEBUG("New zone offset is %lu.\n",
+                                               zone_offset);
+                               continue;
+                       }
+               }
+
+               if (!ul || !(*ul & ~((1 << pagebit) - 1))) {
+                       zone_offset += BITS_PER_LONG - pagebit - 1;
+                       continue;
+               }
+
+       } while (!ul || !test_bit(pagebit, ul));
+
+       return zone->zone_start_pfn + zone_offset;
+}
+EXPORT_SYMBOL_GPL(get_next_bit_on);
+
+#ifdef SELF_TEST
+#include <linux/jiffies.h>
+
+static __init int dyn_pageflags_test(void)
+{
+       struct dyn_pageflags test_map;
+       struct page *test_page1 = pfn_to_page(1);
+       unsigned long pfn = 0, start, end;
+       int i, iterations;
+
+       memset(&test_map, 0, sizeof(test_map));
+
+       printk("Dynpageflags testing...\n");
+
+       printk(KERN_INFO "Set page 1...");
+       set_dynpageflag(&test_map, test_page1);
+       if (test_dynpageflag(&test_map, test_page1))
+               printk(KERN_INFO "Ok.\n");
+       else
+               printk(KERN_INFO "FAILED.\n");
+
+       printk(KERN_INFO "Test memory hotplugging #1 ...");
+       {
+               unsigned long orig_size;
+               GET_BIT_AND_UL(&test_map, test_page1);
+               orig_size = (unsigned long) test_map.bitmap[node][zone_num][1];
+               /*
+                * Use the code triggered when zone_start_pfn lowers,
+                * checking that our bit is then set in the third page.
+                */
+               resize_zone_bitmap(&test_map, zone, orig_size,
+                               orig_size + 2, 2);
+               DUMP_DEBUG(&test_map);
+               if ((unsigned long) test_map.bitmap[node][zone_num]
+                               [pagenum + 2] &&
+                   (unsigned long) test_map.bitmap[node][zone_num]
+                               [pagenum + 2][0] == 2UL)
+                       printk(KERN_INFO "Ok.\n");
+               else
+                       printk(KERN_INFO "FAILED.\n");
+       }
+
+       printk(KERN_INFO "Test memory hotplugging #2 ...");
+       {
+               /*
+                * Test expanding bitmap length.
+                */
+               unsigned long orig_size;
+               GET_BIT_AND_UL(&test_map, test_page1);
+               orig_size = (unsigned long) test_map.bitmap[node]
+                                                       [zone_num][1];
+               resize_zone_bitmap(&test_map, zone, orig_size,
+                               orig_size + 2, 0);
+               DUMP_DEBUG(&test_map);
+               pagenum += 2; /* Offset for first test */
+               if (test_map.bitmap[node][zone_num][pagenum] &&
+                   test_map.bitmap[node][zone_num][pagenum][0] == 2UL &&
+                   (unsigned long) test_map.bitmap[node][zone_num][1] ==
+                                               orig_size + 2)
+                       printk(KERN_INFO "Ok.\n");
+               else
+                       printk(KERN_INFO "FAILED ([%d][%d][%d]: %p && %lu == "
+                               "2UL  && %p == %lu).\n",
+                               node, zone_num, pagenum,
+                               test_map.bitmap[node][zone_num][pagenum],
+                               test_map.bitmap[node][zone_num][pagenum] ?
+                               test_map.bitmap[node][zone_num][pagenum][0] : 0,
+                               test_map.bitmap[node][zone_num][1],
+                               orig_size + 2);
+       }
+
+       free_dyn_pageflags(&test_map);
+
+       allocate_dyn_pageflags(&test_map, 0);
+
+       start = jiffies;
+
+       iterations = 25000000 / max_pfn;
+
+       for (i = 0; i < iterations; i++) {
+               for (pfn = 0; pfn < max_pfn; pfn++)
+                       set_dynpageflag(&test_map, pfn_to_page(pfn));
+               for (pfn = 0; pfn < max_pfn; pfn++)
+                       clear_dynpageflag(&test_map, pfn_to_page(pfn));
+       }
+
+       end = jiffies;
+
+       free_dyn_pageflags(&test_map);
+
+       printk(KERN_INFO "Dyn: %d iterations of setting & clearing all %lu "
+                       "flags took %lu jiffies.\n",
+                       iterations, max_pfn, end - start);
+
+       start = jiffies;
+
+       for (i = 0; i < iterations; i++) {
+               for (pfn = 0; pfn < max_pfn; pfn++)
+                       set_bit(7, &(pfn_to_page(pfn))->flags);
+               for (pfn = 0; pfn < max_pfn; pfn++)
+                       clear_bit(7, &(pfn_to_page(pfn))->flags);
+       }
+
+       end = jiffies;
+
+       printk(KERN_INFO "Real flags: %d iterations of setting & clearing "
+                       "all %lu flags took %lu jiffies.\n",
+                       iterations, max_pfn, end - start);
+
+       iterations = 25000000;
+
+       start = jiffies;
+
+       for (i = 0; i < iterations; i++) {
+               set_dynpageflag(&test_map, pfn_to_page(1));
+               clear_dynpageflag(&test_map, pfn_to_page(1));
+       }
+
+       end = jiffies;
+
+       printk(KERN_INFO "Dyn: %d iterations of setting & clearing all one "
+                       "flag took %lu jiffies.\n", iterations, end - start);
+
+       start = jiffies;
+
+       for (i = 0; i < iterations; i++) {
+               set_bit(7, &(pfn_to_page(1))->flags);
+               clear_bit(7, &(pfn_to_page(1))->flags);
+       }
+
+       end = jiffies;
+
+       printk(KERN_INFO "Real pageflag: %d iterations of setting & clearing "
+                       "all one flag took %lu jiffies.\n",
+                       iterations, end - start);
+       return 0;
+}
+
+late_initcall(dyn_pageflags_test);
+#endif
+
+static int __init dyn_pageflags_debug_setup(char *str)
+{
+       printk(KERN_INFO "Dynamic pageflags debugging enabled.\n");
+       dyn_pageflags_debug = 1;
+       return 1;
+}
+
+__setup("dyn_pageflags_debug", dyn_pageflags_debug_setup);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 89fee2d..bb289fd 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -213,6 +213,8 @@ static int __add_zone(struct zone *zone, unsigned long phys_start_pfn)
        pgdat_resize_unlock(zone->zone_pgdat, &flags);
        memmap_init_zone(nr_pages, nid, zone_type,
                         phys_start_pfn, MEMMAP_HOTPLUG);
+
+       dyn_pageflags_hotplug(zone);
        return 0;
 }
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 27b8681..6a707ed 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1777,6 +1777,26 @@ static unsigned int nr_free_zone_pages(int offset)
        return sum;
 }
 
+static unsigned int nr_unallocated_zone_pages(int offset)
+{
+       struct zoneref *z;
+       struct zone *zone;
+
+       /* Just pick one node, since fallback list is circular */
+       unsigned int sum = 0;
+
+       struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL);
+
+       for_each_zone_zonelist(zone, z, zonelist, offset) {
+               unsigned long high = zone->pages_high;
+               unsigned long left = zone_page_state(zone, NR_FREE_PAGES);
+               if (left > high)
+                       sum += left - high;
+       }
+
+       return sum;
+}
+
 /*
  * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
  */
@@ -1787,6 +1807,15 @@ unsigned int nr_free_buffer_pages(void)
 EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
 
 /*
+ * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
+ */
+unsigned int nr_unallocated_buffer_pages(void)
+{
+       return nr_unallocated_zone_pages(gfp_zone(GFP_USER));
+}
+EXPORT_SYMBOL_GPL(nr_unallocated_buffer_pages);
+
+/*
  * Amount of free RAM allocatable within all zones
  */
 unsigned int nr_free_pagecache_pages(void)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 1ff1a58..c02c6e6 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -811,6 +811,28 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
        return nr_taken;
 }
 
+/* return_lru_pages puts a list of pages back on a zone's lru lists. */
+
+static void return_lru_pages(struct list_head *page_list, struct zone *zone,
+               struct pagevec *pvec)
+{
+       while (!list_empty(page_list)) {
+               struct page *page = lru_to_page(page_list);
+               VM_BUG_ON(PageLRU(page));
+               SetPageLRU(page);
+               list_del(&page->lru);
+               if (PageActive(page))
+                       add_page_to_active_list(zone, page);
+               else
+                       add_page_to_inactive_list(zone, page);
+               if (!pagevec_add(pvec, page)) {
+                       spin_unlock_irq(&zone->lru_lock);
+                       __pagevec_release(pvec);
+                       spin_lock_irq(&zone->lru_lock);
+               }
+       }
+}
+
 static unsigned long isolate_pages_global(unsigned long nr,
                                        struct list_head *dst,
                                        unsigned long *scanned, int order,
@@ -861,7 +883,6 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
        lru_add_drain();
        spin_lock_irq(&zone->lru_lock);
        do {
-               struct page *page;
                unsigned long nr_taken;
                unsigned long nr_scan;
                unsigned long nr_freed;
@@ -923,21 +944,7 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
                /*
                 * Put back any unfreeable pages.
                 */
-               while (!list_empty(&page_list)) {
-                       page = lru_to_page(&page_list);
-                       VM_BUG_ON(PageLRU(page));
-                       SetPageLRU(page);
-                       list_del(&page->lru);
-                       if (PageActive(page))
-                               add_page_to_active_list(zone, page);
-                       else
-                               add_page_to_inactive_list(zone, page);
-                       if (!pagevec_add(&pvec, page)) {
-                               spin_unlock_irq(&zone->lru_lock);
-                               __pagevec_release(&pvec);
-                               spin_lock_irq(&zone->lru_lock);
-                       }
-               }
+               return_lru_pages(&page_list, zone, &pvec);
        } while (nr_scanned < max_scan);
        spin_unlock(&zone->lru_lock);
 done:
@@ -1665,6 +1672,72 @@ out:
        return nr_reclaimed;
 }
 
+struct lru_save {
+       struct zone             *zone;
+       struct list_head        active_list;
+       struct list_head        inactive_list;
+       struct lru_save         *next;
+};
+
+struct lru_save *lru_save_list;
+
+void unlink_lru_lists(void)
+{
+       struct zone *zone;
+
+       for_each_zone(zone) {
+               struct lru_save *this;
+               unsigned long moved, scanned;
+
+               if (!zone->spanned_pages)
+                       continue;
+
+               this = (struct lru_save *)
+                       kzalloc(sizeof(struct lru_save), GFP_ATOMIC);
+
+               BUG_ON(!this);
+
+               this->next = lru_save_list;
+               lru_save_list = this;
+
+               this->zone = zone;
+
+               spin_lock_irq(&zone->lru_lock);
+               INIT_LIST_HEAD(&this->active_list);
+               INIT_LIST_HEAD(&this->inactive_list);
+               moved = isolate_lru_pages(zone_page_state(zone, NR_ACTIVE),
+                               &zone->active_list, &this->active_list,
+                               &scanned, 0, ISOLATE_BOTH);
+               __mod_zone_page_state(zone, NR_ACTIVE, -moved);
+               moved = isolate_lru_pages(zone_page_state(zone, NR_INACTIVE),
+                               &zone->inactive_list, &this->inactive_list,
+                               &scanned, 0, ISOLATE_BOTH);
+               __mod_zone_page_state(zone, NR_INACTIVE, -moved);
+               spin_unlock_irq(&zone->lru_lock);
+       }
+}
+
+void relink_lru_lists(void)
+{
+       while (lru_save_list) {
+               struct lru_save *this = lru_save_list;
+               struct zone *zone = this->zone;
+               struct pagevec pvec;
+
+               pagevec_init(&pvec, 1);
+
+               lru_save_list = this->next;
+
+               spin_lock_irq(&zone->lru_lock);
+               return_lru_pages(&this->active_list, zone, &pvec);
+               return_lru_pages(&this->inactive_list, zone, &pvec);
+               spin_unlock_irq(&zone->lru_lock);
+               pagevec_release(&pvec);
+
+               kfree(this);
+       }
+}
+
 /*
  * The background pageout daemon, started as a kernel thread
  * from the init process. 
@@ -1749,6 +1822,9 @@ void wakeup_kswapd(struct zone *zone, int order)
        if (!populated_zone(zone))
                return;
 
+       if (freezer_is_on())
+               return;
+
        pgdat = zone->zone_pgdat;
        if (zone_watermark_ok(zone, order, zone->pages_low, 0, 0))
                return;
@@ -1762,6 +1838,109 @@ void wakeup_kswapd(struct zone *zone, int order)
 }
 
 #ifdef CONFIG_PM
+static unsigned long shrink_ps1_zone(struct zone *zone,
+       unsigned long total_to_free, struct scan_control sc)
+{
+       unsigned long freed = 0;
+
+       while (total_to_free > freed) {
+               unsigned long nr_slab = global_page_state(NR_SLAB_RECLAIMABLE);
+               struct reclaim_state reclaim_state;
+
+               if (nr_slab > total_to_free)
+                       nr_slab = total_to_free;
+
+               reclaim_state.reclaimed_slab = 0;
+               shrink_slab(nr_slab, sc.gfp_mask, nr_slab);
+               if (!reclaim_state.reclaimed_slab)
+                       return freed;
+
+               freed += reclaim_state.reclaimed_slab;
+       }
+
+       return freed;
+}
+
+unsigned long shrink_ps2_zone(struct zone *zone, unsigned long total_to_free,
+               struct scan_control sc)
+{
+       int prio;
+       unsigned long freed = 0;
+       if (!populated_zone(zone) || zone_is_all_unreclaimable(zone))
+               return 0;
+
+       for (prio = DEF_PRIORITY; prio >= 0; prio--) {
+               unsigned long to_free, just_freed, orig_size;
+               unsigned long old_nr_active;
+
+               to_free = min(zone_page_state(zone, NR_ACTIVE) +
+                               zone_page_state(zone, NR_INACTIVE),
+                               total_to_free - freed);
+
+               if (to_free <= 0)
+                       return freed;
+
+               sc.swap_cluster_max = to_free -
+                       zone_page_state(zone, NR_INACTIVE);
+
+               do {
+                       old_nr_active = zone_page_state(zone, NR_ACTIVE);
+                       zone->nr_scan_active = sc.swap_cluster_max - 1;
+                       shrink_active_list(sc.swap_cluster_max, zone, &sc,
+                                       prio);
+                       zone->nr_scan_active = 0;
+
+                       sc.swap_cluster_max = to_free - zone_page_state(zone,
+                                       NR_INACTIVE);
+
+               } while (sc.swap_cluster_max > 0 &&
+                        zone_page_state(zone, NR_ACTIVE) > old_nr_active);
+
+               to_free = min(zone_page_state(zone, NR_ACTIVE) +
+                               zone_page_state(zone, NR_INACTIVE),
+                               total_to_free - freed);
+
+               do {
+                       orig_size = zone_page_state(zone, NR_ACTIVE) +
+                               zone_page_state(zone, NR_INACTIVE);
+                       zone->nr_scan_inactive = to_free;
+                       sc.swap_cluster_max = to_free;
+                       shrink_inactive_list(to_free, zone, &sc);
+                       just_freed = (orig_size -
+                               (zone_page_state(zone, NR_ACTIVE) +
+                                zone_page_state(zone, NR_INACTIVE)));
+                       zone->nr_scan_inactive = 0;
+                       freed += just_freed;
+               } while (just_freed > 0 && freed < total_to_free);
+       }
+
+       return freed;
+}
+
+void shrink_one_zone(struct zone *zone, unsigned long total_to_free,
+               int ps_wanted)
+{
+       unsigned long freed = 0;
+       struct scan_control sc = {
+               .gfp_mask = GFP_KERNEL,
+               .may_swap = 0,
+               .may_writepage = 1,
+               .swappiness = vm_swappiness,
+               .isolate_pages = isolate_pages_global,
+       };
+
+       if (total_to_free <= 0)
+               return;
+
+       if (is_highmem(zone))
+               sc.gfp_mask |= __GFP_HIGHMEM;
+
+       if (ps_wanted & 2)
+               freed = shrink_ps2_zone(zone, total_to_free, sc);
+       if (ps_wanted & 1)
+               shrink_ps1_zone(zone, total_to_free - freed, sc);
+}
+
 /*
  * Helper function for shrink_all_memory().  Tries to reclaim 'nr_pages' pages
  * from LRU lists system-wide, for given pass and priority, and returns the