- obsolete

[packages/kernel.git] / raid-2.2.19-A1

--- linux/init/main.c.orig      Tue Jan 16 13:30:09 2001
+++ linux/init/main.c   Tue Jan 16 13:42:03 2001
@@ -19,6 +19,7 @@
 #include <linux/utsname.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
+#include <linux/raid/md.h>
 #include <linux/smp_lock.h>
 #include <linux/blk.h>
 #include <linux/hdreg.h>
@@ -549,7 +550,7 @@
 #ifdef CONFIG_BLK_DEV_FD
        { "fd",      0x0200 },
 #endif
-#ifdef CONFIG_MD_BOOT
+#if CONFIG_MD_BOOT || CONFIG_AUTODETECT_RAID
        { "md",      0x0900 },       
 #endif     
 #ifdef CONFIG_BLK_DEV_XD
@@ -1060,6 +1061,9 @@
 #ifdef CONFIG_MD_BOOT
        { "md=", md_setup},
 #endif
+#if CONFIG_BLK_DEV_MD
+       { "raid=", raid_setup},
+#endif
 #ifdef CONFIG_ADBMOUSE
        { "adb_buttons=", adb_mouse_setup },
 #endif
@@ -1637,6 +1641,9 @@
                        while (pid != wait(&i));
                if (MAJOR(real_root_dev) != RAMDISK_MAJOR
                     || MINOR(real_root_dev) != 0) {
+#ifdef CONFIG_BLK_DEV_MD
+                       autodetect_raid();
+#endif
                        error = change_root(real_root_dev,"/initrd");
                        if (error)
                                printk(KERN_ERR "Change root to /initrd: "
--- linux/include/linux/raid/hsm.h.orig Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/hsm.h      Tue Jan 16 13:42:03 2001
@@ -0,0 +1,65 @@
+#ifndef _HSM_H
+#define _HSM_H
+
+#include <linux/raid/md.h>
+
+#if __alpha__
+#error fix cpu_addr on Alpha first
+#endif
+
+#include <linux/raid/hsm_p.h>
+
+#define index_pv(lv,index) ((lv)->vg->pv_array+(index)->data.phys_nr)
+#define index_dev(lv,index) index_pv((lv),(index))->dev
+#define index_block(lv,index) (index)->data.phys_block
+#define index_child(index) ((lv_lptr_t *)((index)->cpu_addr))
+
+#define ptr_to_cpuaddr(ptr) ((__u32) (ptr))
+
+
+typedef struct pv_bg_desc_s {
+       unsigned int            free_blocks;
+       pv_block_group_t        *bg;
+} pv_bg_desc_t;
+
+typedef struct pv_s pv_t;
+typedef struct vg_s vg_t;
+typedef struct lv_s lv_t;
+
+struct pv_s
+{
+       int                     phys_nr;
+       kdev_t                  dev;
+       pv_sb_t                 *pv_sb;
+       pv_bg_desc_t            *bg_array;
+};
+
+struct lv_s
+{
+       int             log_id;
+       vg_t            *vg;
+
+       unsigned int    max_indices;
+       unsigned int    free_indices;
+       lv_lptr_t       root_index;
+
+       kdev_t          dev;
+};
+
+struct vg_s
+{
+       int             nr_pv;
+       pv_t            pv_array [MD_SB_DISKS];
+
+       int             nr_lv;
+       lv_t            lv_array [HSM_MAX_LVS_PER_VG];
+
+       vg_sb_t         *vg_sb;
+       mddev_t         *mddev;
+};
+
+#define kdev_to_lv(dev) ((lv_t *) mddev_map[MINOR(dev)].data)
+#define mddev_to_vg(mddev) ((vg_t *) mddev->private)
+
+#endif
+
--- linux/include/linux/raid/hsm_p.h.orig       Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/hsm_p.h    Tue Jan 16 13:42:03 2001
@@ -0,0 +1,237 @@
+#ifndef _HSM_P_H
+#define _HSM_P_H
+
+#define HSM_BLOCKSIZE 4096
+#define HSM_BLOCKSIZE_WORDS (HSM_BLOCKSIZE/4)
+#define PACKED __attribute__ ((packed))
+
+/*
+ * Identifies a block in physical space
+ */
+typedef struct phys_idx_s {
+       __u16 phys_nr;
+       __u32 phys_block;
+
+} PACKED phys_idx_t;
+
+/*
+ * Identifies a block in logical space
+ */
+typedef struct log_idx_s {
+       __u16 log_id;
+       __u32 log_index;
+
+} PACKED log_idx_t;
+
+/*
+ * Describes one PV
+ */
+#define HSM_PV_SB_MAGIC          0xf091ae9fU
+
+#define HSM_PV_SB_GENERIC_WORDS 32
+#define HSM_PV_SB_RESERVED_WORDS \
+               (HSM_BLOCKSIZE_WORDS - HSM_PV_SB_GENERIC_WORDS)
+
+/*
+ * On-disk PV identification data, on block 0 in any PV.
+ */
+typedef struct pv_sb_s
+{
+       __u32 pv_magic;         /*  0                                       */
+
+       __u32 pv_uuid0;         /*  1                                       */
+       __u32 pv_uuid1;         /*  2                                       */
+       __u32 pv_uuid2;         /*  3                                       */
+       __u32 pv_uuid3;         /*  4                                       */
+
+       __u32 pv_major;         /*  5                                       */
+       __u32 pv_minor;         /*  6                                       */
+       __u32 pv_patch;         /*  7                                       */
+
+       __u32 pv_ctime;         /*  8 Creation time                         */
+
+       __u32 pv_total_size;    /*  9 size of this PV, in blocks            */
+       __u32 pv_first_free;    /*  10 first free block                     */
+       __u32 pv_first_used;    /*  11 first used block                     */
+       __u32 pv_blocks_left;   /*  12 unallocated blocks                   */
+       __u32 pv_bg_size;       /*  13 size of a block group, in blocks     */
+       __u32 pv_block_size;    /*  14 size of blocks, in bytes             */
+       __u32 pv_pptr_size;     /*  15 size of block descriptor, in bytes   */
+       __u32 pv_block_groups;  /*  16 number of block groups               */
+
+       __u32 __reserved1[HSM_PV_SB_GENERIC_WORDS - 17];
+
+       /*
+        * Reserved
+        */
+       __u32 __reserved2[HSM_PV_SB_RESERVED_WORDS];
+
+} PACKED pv_sb_t;
+
+/*
+ * this is pretty much arbitrary, but has to be less than ~64
+ */
+#define HSM_MAX_LVS_PER_VG 32
+
+#define HSM_VG_SB_GENERIC_WORDS 32
+
+#define LV_DESCRIPTOR_WORDS 8
+#define HSM_VG_SB_RESERVED_WORDS (HSM_BLOCKSIZE_WORDS - \
+       LV_DESCRIPTOR_WORDS*HSM_MAX_LVS_PER_VG - HSM_VG_SB_GENERIC_WORDS)
+
+#if (HSM_PV_SB_RESERVED_WORDS < 0)
+#error you messed this one up dude ...
+#endif
+
+typedef struct lv_descriptor_s
+{
+       __u32 lv_id;            /*  0                                       */
+       phys_idx_t lv_root_idx; /*  1                                       */
+       __u16 __reserved;       /*  2                                       */
+       __u32 lv_max_indices;   /*  3                                       */
+       __u32 lv_free_indices;  /*  4                                       */
+       __u32 md_id;            /*  5                                       */
+
+       __u32 reserved[LV_DESCRIPTOR_WORDS - 6];
+
+} PACKED lv_descriptor_t;
+
+#define HSM_VG_SB_MAGIC          0x98320d7aU
+/*
+ * On-disk VG identification data, in block 1 on all PVs
+ */
+typedef struct vg_sb_s
+{
+       __u32 vg_magic;         /*  0                                       */
+       __u32 nr_lvs;           /*  1                                       */
+
+       __u32 __reserved1[HSM_VG_SB_GENERIC_WORDS - 2];
+
+       lv_descriptor_t lv_array [HSM_MAX_LVS_PER_VG];
+       /*
+        * Reserved
+        */
+       __u32 __reserved2[HSM_VG_SB_RESERVED_WORDS];
+
+} PACKED vg_sb_t;
+
+/*
+ * Describes one LV
+ */
+
+#define HSM_LV_SB_MAGIC          0xe182bd8aU
+
+/* do we need lv_sb_t? */
+
+typedef struct lv_sb_s
+{
+       /*
+        * On-disk LV identifier
+        */
+       __u32 lv_magic;         /*  0 LV identifier                         */
+       __u32 lv_uuid0;         /*  1                                       */
+       __u32 lv_uuid1;         /*  2                                       */
+       __u32 lv_uuid2;         /*  3                                       */
+       __u32 lv_uuid3;         /*  4                                       */
+
+       __u32 lv_major;         /*  5 PV identifier                         */
+       __u32 lv_minor;         /*  6 PV identifier                         */
+       __u32 lv_patch;         /*  7 PV identifier                         */
+
+       __u32 ctime;            /*  8 Creation time                         */
+       __u32 size;             /*  9 size of this LV, in blocks            */
+       phys_idx_t start;       /*  10 position of root index block         */
+       log_idx_t first_free;   /*  11-12 first free index                  */
+
+       /*
+        * Reserved
+        */
+       __u32 reserved[HSM_BLOCKSIZE_WORDS-13];
+
+} PACKED lv_sb_t;
+
+/*
+ * Pointer pointing from the physical space, points to
+ * the LV owning this block. It also contains various
+ * statistics about the physical block.
+ */
+typedef struct pv_pptr_s
+{
+       union {
+       /* case 1 */
+               struct {
+                       log_idx_t owner;
+                       log_idx_t predicted;
+                       __u32 last_referenced;
+               } used;
+       /* case 2 */
+               struct {
+                       __u16 log_id;
+                       __u16 __unused1;
+                       __u32 next_free;
+                       __u32 __unused2;
+                       __u32 __unused3;
+               } free;
+       } u;
+} PACKED pv_pptr_t;
+
+static __inline__ int pv_pptr_free (const pv_pptr_t * pptr)
+{
+       return !pptr->u.free.log_id;
+}
+
+
+#define DATA_BLOCKS_PER_BG ((HSM_BLOCKSIZE*8)/(8*sizeof(pv_pptr_t)+1))
+
+#define TOTAL_BLOCKS_PER_BG (DATA_BLOCKS_PER_BG+1)
+/*
+ * A table of pointers filling up a single block, managing
+ * the next DATA_BLOCKS_PER_BG physical blocks. Such block
+ * groups form the physical space of blocks.
+ */
+typedef struct pv_block_group_s
+{
+       __u8 used_bitmap[(DATA_BLOCKS_PER_BG+7)/8];
+
+       pv_pptr_t blocks[DATA_BLOCKS_PER_BG];
+
+} PACKED pv_block_group_t;
+
+/*
+ * Pointer from the logical space, points to
+ * the (PV,block) containing this logical block
+ */
+typedef struct lv_lptr_s
+{
+       phys_idx_t data;
+       __u16 __reserved;
+       __u32 cpu_addr;
+       __u32 __reserved2;
+
+} PACKED lv_lptr_t;
+
+static __inline__ int index_free (const lv_lptr_t * index)
+{
+       return !index->data.phys_block;
+}
+
+static __inline__ int index_present (const lv_lptr_t * index)
+{
+       return index->cpu_addr;
+}
+
+
+#define HSM_LPTRS_PER_BLOCK (HSM_BLOCKSIZE/sizeof(lv_lptr_t))
+/*
+ * A table of pointers filling up a single block, managing
+ * HSM_LPTRS_PER_BLOCK logical blocks. Such block groups form
+ * the logical space of blocks.
+ */
+typedef struct lv_index_block_s
+{
+       lv_lptr_t blocks[HSM_LPTRS_PER_BLOCK];
+
+} PACKED lv_index_block_t;
+
+#endif
+
--- linux/include/linux/raid/linear.h.orig      Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/linear.h   Tue Jan 16 13:44:37 2001
@@ -0,0 +1,32 @@
+#ifndef _LINEAR_H
+#define _LINEAR_H
+
+#include <linux/raid/md.h>
+
+struct dev_info {
+       kdev_t          dev;
+       int             size;
+       unsigned int    offset;
+};
+
+typedef struct dev_info dev_info_t;
+
+struct linear_hash
+{
+       dev_info_t *dev0, *dev1;
+};
+
+struct linear_private_data
+{
+       struct linear_hash      *hash_table;
+       dev_info_t              disks[MD_SB_DISKS];
+       dev_info_t              *smallest;
+       int                     nr_zones;
+};
+
+
+typedef struct linear_private_data linear_conf_t;
+
+#define mddev_to_conf(mddev) ((linear_conf_t *) mddev->private)
+
+#endif
--- linux/include/linux/raid/md.h.orig  Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/md.h       Tue Jan 16 13:47:20 2001
@@ -0,0 +1,96 @@
+/*
+   md.h : Multiple Devices driver for Linux
+          Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
+          Copyright (C) 1994-96 Marc ZYNGIER
+         <zyngier@ufr-info-p7.ibp.fr> or
+         <maz@gloups.fdn.fr>
+         
+   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, or (at your option)
+   any later version.
+   
+   You should have received a copy of the GNU General Public License
+   (for example /usr/src/linux/COPYING); if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
+*/
+
+#ifndef _MD_H
+#define _MD_H
+
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/blkdev.h>
+#include <asm/semaphore.h>
+#include <linux/major.h>
+#include <linux/ioctl.h>
+#include <linux/types.h>
+#include <asm/bitops.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/hdreg.h>
+#include <linux/sysctl.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
+#include <linux/delay.h>
+#include <net/checksum.h>
+#include <linux/random.h>
+#include <linux/locks.h>
+#include <asm/io.h>
+
+#include <linux/raid/md_compatible.h>
+/*
+ * 'md_p.h' holds the 'physical' layout of RAID devices
+ * 'md_u.h' holds the user <=> kernel API
+ *
+ * 'md_k.h' holds kernel internal definitions
+ */
+
+#include <linux/raid/md_p.h>
+#include <linux/raid/md_u.h>
+#include <linux/raid/md_k.h>
+
+/*
+ * Different major versions are not compatible.
+ * Different minor versions are only downward compatible.
+ * Different patchlevel versions are downward and upward compatible.
+ */
+#define MD_MAJOR_VERSION                0
+#define MD_MINOR_VERSION                90
+#define MD_PATCHLEVEL_VERSION           0
+
+extern int md_size[MAX_MD_DEVS];
+extern struct hd_struct md_hd_struct[MAX_MD_DEVS];
+
+extern void add_mddev_mapping (mddev_t *mddev, kdev_t dev, void *data);
+extern void del_mddev_mapping (mddev_t *mddev, kdev_t dev);
+extern char * partition_name (kdev_t dev);
+extern int register_md_personality (int p_num, mdk_personality_t *p);
+extern int unregister_md_personality (int p_num);
+extern mdk_thread_t * md_register_thread (void (*run) (void *data),
+                               void *data, const char *name);
+extern void md_unregister_thread (mdk_thread_t *thread);
+extern void md_wakeup_thread(mdk_thread_t *thread);
+extern void md_interrupt_thread (mdk_thread_t *thread);
+extern int md_update_sb (mddev_t *mddev);
+extern int md_do_sync(mddev_t *mddev, mdp_disk_t *spare);
+extern void md_recover_arrays (void);
+extern int md_check_ordering (mddev_t *mddev);
+extern void autodetect_raid(void);
+extern struct gendisk * find_gendisk (kdev_t dev);
+extern int md_notify_reboot(struct notifier_block *this,
+                                       unsigned long code, void *x);
+#if CONFIG_BLK_DEV_MD
+extern void raid_setup(char *str,int *ints) md__init;
+#endif
+#ifdef CONFIG_MD_BOOT
+extern void md_setup(char *str,int *ints) md__init;
+#endif
+
+extern void md_print_devices (void);
+
+#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
+
+#endif _MD_H
+
--- linux/include/linux/raid/md_compatible.h.orig       Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/md_compatible.h    Tue Jan 16 13:47:19 2001
@@ -0,0 +1,387 @@
+
+/*
+   md.h : Multiple Devices driver compatibility layer for Linux 2.0/2.2
+          Copyright (C) 1998 Ingo Molnar
+         
+   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, or (at your option)
+   any later version.
+   
+   You should have received a copy of the GNU General Public License
+   (for example /usr/src/linux/COPYING); if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
+*/
+
+#include <linux/version.h>
+
+#ifndef _MD_COMPATIBLE_H
+#define _MD_COMPATIBLE_H
+
+#define LinuxVersionCode(v, p, s) (((v)<<16)+((p)<<8)+(s))
+
+#if LINUX_VERSION_CODE < LinuxVersionCode(2,1,0)
+
+/* 000 */
+#define md__get_free_pages(x,y) __get_free_pages(x,y,GFP_KERNEL)
+
+#ifdef __i386__
+/* 001 */
+extern __inline__ int md_cpu_has_mmx(void)
+{
+       return x86_capability & 0x00800000;
+}
+#endif
+
+/* 002 */
+#define md_clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
+
+/* 003 */
+/*
+ * someone please suggest a sane compatibility layer for modules
+ */
+#define MD_EXPORT_SYMBOL(x)
+
+/* 004 */
+static inline unsigned long
+md_copy_from_user(void *to, const void *from, unsigned long n)
+{
+       int err;
+
+       err = verify_area(VERIFY_READ,from,n);
+       if (!err)
+               memcpy_fromfs(to, from, n);
+       return err; 
+}
+
+/* 005 */
+extern inline unsigned long
+md_copy_to_user(void *to, const void *from, unsigned long n)
+{
+       int err;
+
+       err = verify_area(VERIFY_WRITE,to,n);
+       if (!err)
+               memcpy_tofs(to, from, n);
+       return err; 
+}
+
+/* 006 */
+#define md_put_user(x,ptr)                                             \
+({                                                                     \
+       int __err;                                                      \
+                                                                       \
+       __err = verify_area(VERIFY_WRITE,ptr,sizeof(*ptr));             \
+       if (!__err)                                                     \
+               put_user(x,ptr);                                        \
+       __err;                                                          \
+})
+
+/* 007 */
+extern inline int md_capable_admin(void)
+{
+       return suser();
+}
+ 
+/* 008 */
+#define MD_FILE_TO_INODE(file) ((file)->f_inode)
+
+/* 009 */
+extern inline void md_flush_signals (void)
+{
+       current->signal = 0;
+}
+ 
+/* 010 */
+#define __S(nr) (1<<((nr)-1))
+extern inline void md_init_signals (void)
+{
+        current->exit_signal = SIGCHLD;
+        current->blocked = ~(__S(SIGKILL));
+}
+#undef __S
+
+/* 011 */
+extern inline unsigned long md_signal_pending (struct task_struct * tsk)
+{
+       return (tsk->signal & ~tsk->blocked);
+}
+
+/* 012 */
+#define md_set_global_readahead(x) read_ahead[MD_MAJOR] = MD_READAHEAD
+
+/* 013 */
+#define md_mdelay(n) (\
+       {unsigned long msec=(n); while (msec--) udelay(1000);})
+
+/* 014 */
+#define MD_SYS_DOWN 0
+#define MD_SYS_HALT 0
+#define MD_SYS_POWER_OFF 0
+
+/* 015 */
+#define md_register_reboot_notifier(x)
+
+/* 016 */
+extern __inline__ unsigned long
+md_test_and_set_bit(int nr, void * addr)
+{
+       unsigned long flags;
+       unsigned long oldbit;
+
+       save_flags(flags);
+       cli();
+       oldbit = test_bit(nr,addr);
+       set_bit(nr,addr);
+       restore_flags(flags);
+       return oldbit;
+}
+
+/* 017 */
+extern __inline__ unsigned long
+md_test_and_clear_bit(int nr, void * addr)
+{
+       unsigned long flags;
+       unsigned long oldbit;
+
+       save_flags(flags);
+       cli();
+       oldbit = test_bit(nr,addr);
+       clear_bit(nr,addr);
+       restore_flags(flags);
+       return oldbit;
+}
+
+/* 018 */
+#define md_atomic_read(x) (*(volatile int *)(x))
+#define md_atomic_set(x,y) (*(volatile int *)(x) = (y))
+
+/* 019 */
+extern __inline__ void md_lock_kernel (void)
+{
+#if __SMP__
+       lock_kernel();
+       syscall_count++;
+#endif
+}
+
+extern __inline__ void md_unlock_kernel (void)
+{
+#if __SMP__
+       syscall_count--;
+       unlock_kernel();
+#endif
+}
+/* 020 */
+
+#define md__init
+#define md__initdata
+#define md__initfunc(__arginit) __arginit
+
+/* 021 */
+
+/* 022 */
+
+struct md_list_head {
+       struct md_list_head *next, *prev;
+};
+
+#define MD_LIST_HEAD(name) \
+       struct md_list_head name = { &name, &name }
+
+#define MD_INIT_LIST_HEAD(ptr) do { \
+       (ptr)->next = (ptr); (ptr)->prev = (ptr); \
+} while (0)
+
+static __inline__ void md__list_add(struct md_list_head * new,
+       struct md_list_head * prev,
+       struct md_list_head * next)
+{
+       next->prev = new;
+       new->next = next;
+       new->prev = prev;
+       prev->next = new;
+}
+
+static __inline__ void md_list_add(struct md_list_head *new,
+                                               struct md_list_head *head)
+{
+       md__list_add(new, head, head->next);
+}
+
+static __inline__ void md__list_del(struct md_list_head * prev,
+                                       struct md_list_head * next)
+{
+       next->prev = prev;
+       prev->next = next;
+}
+
+static __inline__ void md_list_del(struct md_list_head *entry)
+{
+       md__list_del(entry->prev, entry->next);
+}
+
+static __inline__ int md_list_empty(struct md_list_head *head)
+{
+       return head->next == head;
+}
+
+#define md_list_entry(ptr, type, member) \
+       ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
+
+/* 023 */
+
+static __inline__ signed long md_schedule_timeout(signed long timeout)
+{
+       current->timeout = jiffies + timeout;
+       schedule();
+       return 0;
+}
+
+/* 024 */
+#define md_need_resched(tsk) (need_resched)
+
+/* 025 */
+typedef struct { int gcc_is_buggy; } md_spinlock_t;
+#define MD_SPIN_LOCK_UNLOCKED (md_spinlock_t) { 0 }
+
+#define md_spin_lock_irq cli
+#define md_spin_unlock_irq sti
+#define md_spin_unlock_irqrestore(x,flags) restore_flags(flags)
+#define md_spin_lock_irqsave(x,flags) do { save_flags(flags); cli(); } while (0)
+
+/* END */
+
+#else
+
+#include <linux/reboot.h>
+#include <linux/vmalloc.h>
+
+/* 000 */
+#define md__get_free_pages(x,y) __get_free_pages(x,y)
+
+#ifdef __i386__
+/* 001 */
+extern __inline__ int md_cpu_has_mmx(void)
+{
+       return boot_cpu_data.x86_capability & X86_FEATURE_MMX;
+}
+#endif
+
+/* 002 */
+#define md_clear_page(page)        clear_page(page)
+
+/* 003 */
+#define MD_EXPORT_SYMBOL(x) EXPORT_SYMBOL(x)
+
+/* 004 */
+#define md_copy_to_user(x,y,z) copy_to_user(x,y,z)
+
+/* 005 */
+#define md_copy_from_user(x,y,z) copy_from_user(x,y,z)
+
+/* 006 */
+#define md_put_user put_user
+
+/* 007 */
+extern inline int md_capable_admin(void)
+{
+       return capable(CAP_SYS_ADMIN);
+}
+
+/* 008 */
+#define MD_FILE_TO_INODE(file) ((file)->f_dentry->d_inode)
+
+/* 009 */
+extern inline void md_flush_signals (void)
+{
+       spin_lock(&current->sigmask_lock);
+       flush_signals(current);
+       spin_unlock(&current->sigmask_lock);
+}
+ 
+/* 010 */
+extern inline void md_init_signals (void)
+{
+        current->exit_signal = SIGCHLD;
+        siginitsetinv(&current->blocked, sigmask(SIGKILL));
+}
+
+/* 011 */
+#define md_signal_pending signal_pending
+
+/* 012 */
+extern inline void md_set_global_readahead(int * table)
+{
+       max_readahead[MD_MAJOR] = table;
+}
+
+/* 013 */
+#define md_mdelay(x) mdelay(x)
+
+/* 014 */
+#define MD_SYS_DOWN SYS_DOWN
+#define MD_SYS_HALT SYS_HALT
+#define MD_SYS_POWER_OFF SYS_POWER_OFF
+
+/* 015 */
+#define md_register_reboot_notifier register_reboot_notifier
+
+/* 016 */
+#define md_test_and_set_bit test_and_set_bit
+
+/* 017 */
+#define md_test_and_clear_bit test_and_clear_bit
+
+/* 018 */
+#define md_atomic_read atomic_read
+#define md_atomic_set atomic_set
+
+/* 019 */
+#define md_lock_kernel lock_kernel
+#define md_unlock_kernel unlock_kernel
+
+/* 020 */
+
+#include <linux/init.h>
+
+#define md__init __init
+#define md__initdata __initdata
+#define md__initfunc(__arginit) __initfunc(__arginit)
+
+/* 021 */
+
+
+/* 022 */
+
+#define md_list_head list_head
+#define MD_LIST_HEAD(name) LIST_HEAD(name)
+#define MD_INIT_LIST_HEAD(ptr) INIT_LIST_HEAD(ptr)
+#define md_list_add list_add
+#define md_list_del list_del
+#define md_list_empty list_empty
+
+#define md_list_entry(ptr, type, member) list_entry(ptr, type, member)
+
+/* 023 */
+
+#define md_schedule_timeout schedule_timeout
+
+/* 024 */
+#define md_need_resched(tsk) ((tsk)->need_resched)
+
+/* 025 */
+#define md_spinlock_t spinlock_t
+#define MD_SPIN_LOCK_UNLOCKED SPIN_LOCK_UNLOCKED
+
+#define md_spin_lock_irq spin_lock_irq
+#define md_spin_unlock_irq spin_unlock_irq
+#define md_spin_unlock_irqrestore spin_unlock_irqrestore
+#define md_spin_lock_irqsave spin_lock_irqsave
+
+/* END */
+
+#endif
+
+#endif _MD_COMPATIBLE_H
+
--- linux/include/linux/raid/md_k.h.orig        Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/md_k.h     Tue Jan 16 13:42:03 2001
@@ -0,0 +1,338 @@
+/*
+   md_k.h : kernel internal structure of the Linux MD driver
+          Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
+         
+   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, or (at your option)
+   any later version.
+   
+   You should have received a copy of the GNU General Public License
+   (for example /usr/src/linux/COPYING); if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
+*/
+
+#ifndef _MD_K_H
+#define _MD_K_H
+
+#define MD_RESERVED       0UL
+#define LINEAR            1UL
+#define STRIPED           2UL
+#define RAID0             STRIPED
+#define RAID1             3UL
+#define RAID5             4UL
+#define TRANSLUCENT       5UL
+#define HSM               6UL
+#define MAX_PERSONALITY   7UL
+
+extern inline int pers_to_level (int pers)
+{
+       switch (pers) {
+               case HSM:               return -3;
+               case TRANSLUCENT:       return -2;
+               case LINEAR:            return -1;
+               case RAID0:             return 0;
+               case RAID1:             return 1;
+               case RAID5:             return 5;
+       }
+       panic("pers_to_level()");
+}
+
+extern inline int level_to_pers (int level)
+{
+       switch (level) {
+               case -3: return HSM;
+               case -2: return TRANSLUCENT;
+               case -1: return LINEAR;
+               case 0: return RAID0;
+               case 1: return RAID1;
+               case 4:
+               case 5: return RAID5;
+       }
+       return MD_RESERVED;
+}
+
+typedef struct mddev_s mddev_t;
+typedef struct mdk_rdev_s mdk_rdev_t;
+
+#if (MINORBITS != 8)
+#error MD doesnt handle bigger kdev yet
+#endif
+
+#define MAX_REAL     12                        /* Max number of disks per md dev */
+#define MAX_MD_DEVS  (1<<MINORBITS)    /* Max number of md dev */
+
+/*
+ * Maps a kdev to an mddev/subdev. How 'data' is handled is up to
+ * the personality. (eg. HSM uses this to identify individual LVs)
+ */
+typedef struct dev_mapping_s {
+       mddev_t *mddev;
+       void *data;
+} dev_mapping_t;
+
+extern dev_mapping_t mddev_map [MAX_MD_DEVS];
+
+extern inline mddev_t * kdev_to_mddev (kdev_t dev)
+{
+        return mddev_map[MINOR(dev)].mddev;
+}
+
+/*
+ * options passed in raidrun:
+ */
+
+#define MAX_CHUNK_SIZE (4096*1024)
+
+/*
+ * default readahead
+ */
+#define MD_READAHEAD   (256 * 512)
+
+extern inline int disk_faulty(mdp_disk_t * d)
+{
+       return d->state & (1 << MD_DISK_FAULTY);
+}
+
+extern inline int disk_active(mdp_disk_t * d)
+{
+       return d->state & (1 << MD_DISK_ACTIVE);
+}
+
+extern inline int disk_sync(mdp_disk_t * d)
+{
+       return d->state & (1 << MD_DISK_SYNC);
+}
+
+extern inline int disk_spare(mdp_disk_t * d)
+{
+       return !disk_sync(d) && !disk_active(d) && !disk_faulty(d);
+}
+
+extern inline int disk_removed(mdp_disk_t * d)
+{
+       return d->state & (1 << MD_DISK_REMOVED);
+}
+
+extern inline void mark_disk_faulty(mdp_disk_t * d)
+{
+       d->state |= (1 << MD_DISK_FAULTY);
+}
+
+extern inline void mark_disk_active(mdp_disk_t * d)
+{
+       d->state |= (1 << MD_DISK_ACTIVE);
+}
+
+extern inline void mark_disk_sync(mdp_disk_t * d)
+{
+       d->state |= (1 << MD_DISK_SYNC);
+}
+
+extern inline void mark_disk_spare(mdp_disk_t * d)
+{
+       d->state = 0;
+}
+
+extern inline void mark_disk_removed(mdp_disk_t * d)
+{
+       d->state = (1 << MD_DISK_FAULTY) | (1 << MD_DISK_REMOVED);
+}
+
+extern inline void mark_disk_inactive(mdp_disk_t * d)
+{
+       d->state &= ~(1 << MD_DISK_ACTIVE);
+}
+
+extern inline void mark_disk_nonsync(mdp_disk_t * d)
+{
+       d->state &= ~(1 << MD_DISK_SYNC);
+}
+
+/*
+ * MD's 'extended' device
+ */
+struct mdk_rdev_s
+{
+       struct md_list_head same_set;   /* RAID devices within the same set */
+       struct md_list_head all;        /* all RAID devices */
+       struct md_list_head pending;    /* undetected RAID devices */
+
+       kdev_t dev;                     /* Device number */
+       kdev_t old_dev;                 /*  "" when it was last imported */
+       int size;                       /* Device size (in blocks) */
+       mddev_t *mddev;                 /* RAID array if running */
+       unsigned long last_events;      /* IO event timestamp */
+
+       struct inode *inode;            /* Lock inode */
+       struct file filp;               /* Lock file */
+
+       mdp_super_t *sb;
+       int sb_offset;
+
+       int faulty;                     /* if faulty do not issue IO requests */
+       int desc_nr;                    /* descriptor index in the superblock */
+};
+
+
+/*
+ * disk operations in a working array:
+ */
+#define DISKOP_SPARE_INACTIVE  0
+#define DISKOP_SPARE_WRITE     1
+#define DISKOP_SPARE_ACTIVE    2
+#define DISKOP_HOT_REMOVE_DISK 3
+#define DISKOP_HOT_ADD_DISK    4
+
+typedef struct mdk_personality_s mdk_personality_t;
+
+struct mddev_s
+{
+       void                            *private;
+       mdk_personality_t               *pers;
+       int                             __minor;
+       mdp_super_t                     *sb;
+       int                             nb_dev;
+       struct md_list_head             disks;
+       int                             sb_dirty;
+       mdu_param_t                     param;
+       int                             ro;
+       unsigned int                    curr_resync;
+       unsigned long                   resync_start;
+       char                            *name;
+       int                             recovery_running;
+       struct semaphore                reconfig_sem;
+       struct semaphore                recovery_sem;
+       struct semaphore                resync_sem;
+       struct md_list_head             all_mddevs;
+};
+
+struct mdk_personality_s
+{
+       char *name;
+       int (*map)(mddev_t *mddev, kdev_t dev, kdev_t *rdev,
+               unsigned long *rsector, unsigned long size);
+       int (*make_request)(mddev_t *mddev, int rw, struct buffer_head * bh);
+       void (*end_request)(struct buffer_head * bh, int uptodate);
+       int (*run)(mddev_t *mddev);
+       int (*stop)(mddev_t *mddev);
+       int (*status)(char *page, mddev_t *mddev);
+       int (*ioctl)(struct inode *inode, struct file *file,
+               unsigned int cmd, unsigned long arg);
+       int max_invalid_dev;
+       int (*error_handler)(mddev_t *mddev, kdev_t dev);
+
+/*
+ * Some personalities (RAID-1, RAID-5) can have disks hot-added and
+ * hot-removed. Hot removal is different from failure. (failure marks
+ * a disk inactive, but the disk is still part of the array) The interface
+ * to such operations is the 'pers->diskop()' function, can be NULL.
+ *
+ * the diskop function can change the pointer pointing to the incoming
+ * descriptor, but must do so very carefully. (currently only
+ * SPARE_ACTIVE expects such a change)
+ */
+       int (*diskop) (mddev_t *mddev, mdp_disk_t **descriptor, int state);
+
+       int (*stop_resync)(mddev_t *mddev);
+       int (*restart_resync)(mddev_t *mddev);
+};
+
+
+/*
+ * Currently we index md_array directly, based on the minor
+ * number. This will have to change to dynamic allocation
+ * once we start supporting partitioning of md devices.
+ */
+extern inline int mdidx (mddev_t * mddev)
+{
+       return mddev->__minor;
+}
+
+extern inline kdev_t mddev_to_kdev(mddev_t * mddev)
+{
+       return MKDEV(MD_MAJOR, mdidx(mddev));
+}
+
+extern mdk_rdev_t * find_rdev(mddev_t * mddev, kdev_t dev);
+extern mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr);
+
+/*
+ * iterates through some rdev ringlist. It's safe to remove the
+ * current 'rdev'. Dont touch 'tmp' though.
+ */
+#define ITERATE_RDEV_GENERIC(head,field,rdev,tmp)                      \
+                                                                       \
+       for (tmp = head.next;                                           \
+               rdev = md_list_entry(tmp, mdk_rdev_t, field),           \
+                       tmp = tmp->next, tmp->prev != &head             \
+               ; )
+/*
+ * iterates through the 'same array disks' ringlist
+ */
+#define ITERATE_RDEV(mddev,rdev,tmp)                                   \
+       ITERATE_RDEV_GENERIC((mddev)->disks,same_set,rdev,tmp)
+
+/*
+ * Same as above, but assumes that the device has rdev->desc_nr numbered
+ * from 0 to mddev->nb_dev, and iterates through rdevs in ascending order.
+ */
+#define ITERATE_RDEV_ORDERED(mddev,rdev,i)                             \
+       for (i = 0; rdev = find_rdev_nr(mddev, i), i < mddev->nb_dev; i++)
+
+
+/*
+ * Iterates through all 'RAID managed disks'
+ */
+#define ITERATE_RDEV_ALL(rdev,tmp)                                     \
+       ITERATE_RDEV_GENERIC(all_raid_disks,all,rdev,tmp)
+
+/*
+ * Iterates through 'pending RAID disks'
+ */
+#define ITERATE_RDEV_PENDING(rdev,tmp)                                 \
+       ITERATE_RDEV_GENERIC(pending_raid_disks,pending,rdev,tmp)
+
+/*
+ * iterates through all used mddevs in the system.
+ */
+#define ITERATE_MDDEV(mddev,tmp)                                       \
+                                                                       \
+       for (tmp = all_mddevs.next;                                     \
+               mddev = md_list_entry(tmp, mddev_t, all_mddevs),        \
+                       tmp = tmp->next, tmp->prev != &all_mddevs       \
+               ; )
+
+extern inline int lock_mddev (mddev_t * mddev)
+{
+       return down_interruptible(&mddev->reconfig_sem);
+}
+
+extern inline void unlock_mddev (mddev_t * mddev)
+{
+       up(&mddev->reconfig_sem);
+}
+
+#define xchg_values(x,y) do { __typeof__(x) __tmp = x; \
+                               x = y; y = __tmp; } while (0)
+
+typedef struct mdk_thread_s {
+       void                    (*run) (void *data);
+       void                    *data;
+       struct wait_queue       *wqueue;
+       unsigned long           flags;
+       struct semaphore        *sem;
+       struct task_struct      *tsk;
+       const char              *name;
+} mdk_thread_t;
+
+#define THREAD_WAKEUP  0
+
+typedef struct dev_name_s {
+       struct md_list_head list;
+       kdev_t dev;
+       char name [MAX_DISKNAME_LEN];
+} dev_name_t;
+
+#endif _MD_K_H
+
--- linux/include/linux/raid/md_p.h.orig        Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/md_p.h     Tue Jan 16 13:42:03 2001
@@ -0,0 +1,161 @@
+/*
+   md_p.h : physical layout of Linux RAID devices
+          Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
+         
+   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, or (at your option)
+   any later version.
+   
+   You should have received a copy of the GNU General Public License
+   (for example /usr/src/linux/COPYING); if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
+*/
+
+#ifndef _MD_P_H
+#define _MD_P_H
+
+/*
+ * RAID superblock.
+ *
+ * The RAID superblock maintains some statistics on each RAID configuration.
+ * Each real device in the RAID set contains it near the end of the device.
+ * Some of the ideas are copied from the ext2fs implementation.
+ *
+ * We currently use 4096 bytes as follows:
+ *
+ *     word offset     function
+ *
+ *        0  -    31   Constant generic RAID device information.
+ *        32  -    63   Generic state information.
+ *       64  -   127   Personality specific information.
+ *      128  -   511   12 32-words descriptors of the disks in the raid set.
+ *      512  -   911   Reserved.
+ *      912  -  1023   Disk specific descriptor.
+ */
+
+/*
+ * If x is the real device size in bytes, we return an apparent size of:
+ *
+ *     y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES
+ *
+ * and place the 4kB superblock at offset y.
+ */
+#define MD_RESERVED_BYTES              (64 * 1024)
+#define MD_RESERVED_SECTORS            (MD_RESERVED_BYTES / 512)
+#define MD_RESERVED_BLOCKS             (MD_RESERVED_BYTES / BLOCK_SIZE)
+
+#define MD_NEW_SIZE_SECTORS(x)         ((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
+#define MD_NEW_SIZE_BLOCKS(x)          ((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS)
+
+#define MD_SB_BYTES                    4096
+#define MD_SB_WORDS                    (MD_SB_BYTES / 4)
+#define MD_SB_BLOCKS                   (MD_SB_BYTES / BLOCK_SIZE)
+#define MD_SB_SECTORS                  (MD_SB_BYTES / 512)
+
+/*
+ * The following are counted in 32-bit words
+ */
+#define        MD_SB_GENERIC_OFFSET            0
+#define MD_SB_PERSONALITY_OFFSET       64
+#define MD_SB_DISKS_OFFSET             128
+#define MD_SB_DESCRIPTOR_OFFSET                992
+
+#define MD_SB_GENERIC_CONSTANT_WORDS   32
+#define MD_SB_GENERIC_STATE_WORDS      32
+#define MD_SB_GENERIC_WORDS            (MD_SB_GENERIC_CONSTANT_WORDS + MD_SB_GENERIC_STATE_WORDS)
+#define MD_SB_PERSONALITY_WORDS                64
+#define MD_SB_DISKS_WORDS              384
+#define MD_SB_DESCRIPTOR_WORDS         32
+#define MD_SB_RESERVED_WORDS           (1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_WORDS - MD_SB_DESCRIPTOR_WORDS)
+#define MD_SB_EQUAL_WORDS              (MD_SB_GENERIC_WORDS + MD_SB_PERSONALITY_WORDS + MD_SB_DISKS_WORDS)
+#define MD_SB_DISKS                    (MD_SB_DISKS_WORDS / MD_SB_DESCRIPTOR_WORDS)
+
+/*
+ * Device "operational" state bits
+ */
+#define MD_DISK_FAULTY         0 /* disk is faulty / operational */
+#define MD_DISK_ACTIVE         1 /* disk is running or spare disk */
+#define MD_DISK_SYNC           2 /* disk is in sync with the raid set */
+#define MD_DISK_REMOVED                3 /* disk is in sync with the raid set */
+
+typedef struct mdp_device_descriptor_s {
+       __u32 number;           /* 0 Device number in the entire set          */
+       __u32 major;            /* 1 Device major number                      */
+       __u32 minor;            /* 2 Device minor number                      */
+       __u32 raid_disk;        /* 3 The role of the device in the raid set   */
+       __u32 state;            /* 4 Operational state                        */
+       __u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5];
+} mdp_disk_t;
+
+#define MD_SB_MAGIC            0xa92b4efc
+
+/*
+ * Superblock state bits
+ */
+#define MD_SB_CLEAN            0
+#define MD_SB_ERRORS           1
+
+typedef struct mdp_superblock_s {
+       /*
+        * Constant generic information
+        */
+       __u32 md_magic;         /*  0 MD identifier                           */
+       __u32 major_version;    /*  1 major version to which the set conforms */
+       __u32 minor_version;    /*  2 minor version ...                       */
+       __u32 patch_version;    /*  3 patchlevel version ...                  */
+       __u32 gvalid_words;     /*  4 Number of used words in this section    */
+       __u32 set_uuid0;        /*  5 Raid set identifier                     */
+       __u32 ctime;            /*  6 Creation time                           */
+       __u32 level;            /*  7 Raid personality                        */
+       __u32 size;             /*  8 Apparent size of each individual disk   */
+       __u32 nr_disks;         /*  9 total disks in the raid set             */
+       __u32 raid_disks;       /* 10 disks in a fully functional raid set    */
+       __u32 md_minor;         /* 11 preferred MD minor device number        */
+       __u32 not_persistent;   /* 12 does it have a persistent superblock    */
+       __u32 set_uuid1;        /* 13 Raid set identifier #2                  */
+       __u32 set_uuid2;        /* 14 Raid set identifier #3                  */
+       __u32 set_uuid3;        /* 14 Raid set identifier #4                  */
+       __u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 16];
+
+       /*
+        * Generic state information
+        */
+       __u32 utime;            /*  0 Superblock update time                  */
+       __u32 state;            /*  1 State bits (clean, ...)                 */
+       __u32 active_disks;     /*  2 Number of currently active disks        */
+       __u32 working_disks;    /*  3 Number of working disks                 */
+       __u32 failed_disks;     /*  4 Number of failed disks                  */
+       __u32 spare_disks;      /*  5 Number of spare disks                   */
+       __u32 sb_csum;          /*  6 checksum of the whole superblock        */
+       __u64 events;           /*  7 number of superblock updates (64-bit!)  */
+       __u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 9];
+
+       /*
+        * Personality information
+        */
+       __u32 layout;           /*  0 the array's physical layout             */
+       __u32 chunk_size;       /*  1 chunk size in bytes                     */
+       __u32 root_pv;          /*  2 LV root PV */
+       __u32 root_block;       /*  3 LV root block */
+       __u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 4];
+
+       /*
+        * Disks information
+        */
+       mdp_disk_t disks[MD_SB_DISKS];
+
+       /*
+        * Reserved
+        */
+       __u32 reserved[MD_SB_RESERVED_WORDS];
+
+       /*
+        * Active descriptor
+        */
+       mdp_disk_t this_disk;
+
+} mdp_super_t;
+
+#endif _MD_P_H
+
--- linux/include/linux/raid/md_u.h.orig        Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/md_u.h     Tue Jan 16 13:42:03 2001
@@ -0,0 +1,115 @@
+/*
+   md_u.h : user <=> kernel API between Linux raidtools and RAID drivers
+          Copyright (C) 1998 Ingo Molnar
+         
+   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, or (at your option)
+   any later version.
+   
+   You should have received a copy of the GNU General Public License
+   (for example /usr/src/linux/COPYING); if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
+*/
+
+#ifndef _MD_U_H
+#define _MD_U_H
+
+/* ioctls */
+
+/* status */
+#define RAID_VERSION           _IOR (MD_MAJOR, 0x10, mdu_version_t)
+#define GET_ARRAY_INFO         _IOR (MD_MAJOR, 0x11, mdu_array_info_t)
+#define GET_DISK_INFO          _IOR (MD_MAJOR, 0x12, mdu_disk_info_t)
+#define PRINT_RAID_DEBUG       _IO (MD_MAJOR, 0x13)
+
+/* configuration */
+#define CLEAR_ARRAY            _IO (MD_MAJOR, 0x20)
+#define ADD_NEW_DISK           _IOW (MD_MAJOR, 0x21, mdu_disk_info_t)
+#define HOT_REMOVE_DISK                _IO (MD_MAJOR, 0x22)
+#define SET_ARRAY_INFO         _IOW (MD_MAJOR, 0x23, mdu_array_info_t)
+#define SET_DISK_INFO          _IO (MD_MAJOR, 0x24)
+#define WRITE_RAID_INFO                _IO (MD_MAJOR, 0x25)
+#define UNPROTECT_ARRAY                _IO (MD_MAJOR, 0x26)
+#define PROTECT_ARRAY          _IO (MD_MAJOR, 0x27)
+#define HOT_ADD_DISK           _IO (MD_MAJOR, 0x28)
+#define SET_DISK_FAULTY                _IO (MD_MAJOR, 0x29)
+
+/* usage */
+#define RUN_ARRAY              _IOW (MD_MAJOR, 0x30, mdu_param_t)
+#define START_ARRAY            _IO (MD_MAJOR, 0x31)
+#define STOP_ARRAY             _IO (MD_MAJOR, 0x32)
+#define STOP_ARRAY_RO          _IO (MD_MAJOR, 0x33)
+#define RESTART_ARRAY_RW       _IO (MD_MAJOR, 0x34)
+
+typedef struct mdu_version_s {
+       int major;
+       int minor;
+       int patchlevel;
+} mdu_version_t;
+
+typedef struct mdu_array_info_s {
+       /*
+        * Generic constant information
+        */
+       int major_version;
+       int minor_version;
+       int patch_version;
+       int ctime;
+       int level;
+       int size;
+       int nr_disks;
+       int raid_disks;
+       int md_minor;
+       int not_persistent;
+
+       /*
+        * Generic state information
+        */
+       int utime;              /*  0 Superblock update time                  */
+       int state;              /*  1 State bits (clean, ...)                 */
+       int active_disks;       /*  2 Number of currently active disks        */
+       int working_disks;      /*  3 Number of working disks                 */
+       int failed_disks;       /*  4 Number of failed disks                  */
+       int spare_disks;        /*  5 Number of spare disks                   */
+
+       /*
+        * Personality information
+        */
+       int layout;             /*  0 the array's physical layout             */
+       int chunk_size; /*  1 chunk size in bytes                     */
+
+} mdu_array_info_t;
+
+typedef struct mdu_disk_info_s {
+       /*
+        * configuration/status of one particular disk
+        */
+       int number;
+       int major;
+       int minor;
+       int raid_disk;
+       int state;
+
+} mdu_disk_info_t;
+
+typedef struct mdu_start_info_s {
+       /*
+        * configuration/status of one particular disk
+        */
+       int major;
+       int minor;
+       int raid_disk;
+       int state;
+
+} mdu_start_info_t;
+
+typedef struct mdu_param_s
+{
+       int                     personality;    /* 1,2,3,4 */
+       int                     chunk_size;     /* in bytes */
+       int                     max_fault;      /* unused for now */
+} mdu_param_t;
+
+#endif _MD_U_H
+
--- linux/include/linux/raid/raid0.h.orig       Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/raid0.h    Tue Jan 16 13:44:37 2001
@@ -0,0 +1,33 @@
+#ifndef _RAID0_H
+#define _RAID0_H
+
+#include <linux/raid/md.h>
+
+struct strip_zone
+{
+       int zone_offset;                /* Zone offset in md_dev */
+       int dev_offset;                 /* Zone offset in real dev */
+       int size;                       /* Zone size */
+       int nb_dev;                     /* # of devices attached to the zone */
+       mdk_rdev_t *dev[MAX_REAL]; /* Devices attached to the zone */
+};
+
+struct raid0_hash
+{
+       struct strip_zone *zone0, *zone1;
+};
+
+struct raid0_private_data
+{
+       struct raid0_hash *hash_table; /* Dynamically allocated */
+       struct strip_zone *strip_zone; /* This one too */
+       int nr_strip_zones;
+       struct strip_zone *smallest;
+       int nr_zones;
+};
+
+typedef struct raid0_private_data raid0_conf_t;
+
+#define mddev_to_conf(mddev) ((raid0_conf_t *) mddev->private)
+
+#endif
--- linux/include/linux/raid/raid1.h.orig       Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/raid1.h    Tue Jan 16 13:44:37 2001
@@ -0,0 +1,64 @@
+#ifndef _RAID1_H
+#define _RAID1_H
+
+#include <linux/raid/md.h>
+
+struct mirror_info {
+       int             number;
+       int             raid_disk;
+       kdev_t          dev;
+       int             next;
+       int             sect_limit;
+
+       /*
+        * State bits:
+        */
+       int             operational;
+       int             write_only;
+       int             spare;
+
+       int             used_slot;
+};
+
+struct raid1_private_data {
+       mddev_t                 *mddev;
+       struct mirror_info      mirrors[MD_SB_DISKS];
+       int                     nr_disks;
+       int                     raid_disks;
+       int                     working_disks;
+       int                     last_used;
+       unsigned long           next_sect;
+       int                     sect_count;
+       mdk_thread_t            *thread, *resync_thread;
+       int                     resync_mirrors;
+       struct mirror_info      *spare;
+};
+
+typedef struct raid1_private_data raid1_conf_t;
+
+/*
+ * this is the only point in the RAID code where we violate
+ * C type safety. mddev->private is an 'opaque' pointer.
+ */
+#define mddev_to_conf(mddev) ((raid1_conf_t *) mddev->private)
+
+/*
+ * this is our 'private' 'collective' RAID1 buffer head.
+ * it contains information about what kind of IO operations were started
+ * for this RAID1 operation, and about their status:
+ */
+
+struct raid1_bh {
+       atomic_t                remaining; /* 'have we finished' count,
+                                           * used from IRQ handlers
+                                           */
+       int                     cmd;
+       unsigned long           state;
+       mddev_t                 *mddev;
+       struct buffer_head      *master_bh;
+       struct buffer_head      *mirror_bh [MD_SB_DISKS];
+       struct buffer_head      bh_req;
+       struct buffer_head      *next_retry;
+};
+
+#endif
--- linux/include/linux/raid/raid5.h.orig       Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/raid5.h    Tue Jan 16 13:44:37 2001
@@ -0,0 +1,113 @@
+#ifndef _RAID5_H
+#define _RAID5_H
+
+#include <linux/raid/md.h>
+#include <linux/raid/xor.h>
+
+struct disk_info {
+       kdev_t  dev;
+       int     operational;
+       int     number;
+       int     raid_disk;
+       int     write_only;
+       int     spare;
+       int     used_slot;
+};
+
+struct stripe_head {
+       md_spinlock_t           stripe_lock;
+       struct stripe_head      *hash_next, **hash_pprev; /* hash pointers */
+       struct stripe_head      *free_next;             /* pool of free sh's */
+       struct buffer_head      *buffer_pool;           /* pool of free buffers */
+       struct buffer_head      *bh_pool;               /* pool of free bh's */
+       struct raid5_private_data       *raid_conf;
+       struct buffer_head      *bh_old[MD_SB_DISKS];   /* disk image */
+       struct buffer_head      *bh_new[MD_SB_DISKS];   /* buffers of the MD device (present in buffer cache) */
+       struct buffer_head      *bh_copy[MD_SB_DISKS];  /* copy on write of bh_new (bh_new can change from under us) */
+       struct buffer_head      *bh_req[MD_SB_DISKS];   /* copy of bh_new (only the buffer heads), queued to the lower levels */
+       int                     cmd_new[MD_SB_DISKS];   /* READ/WRITE for new */
+       int                     new[MD_SB_DISKS];       /* buffer added since the last handle_stripe() */
+       unsigned long           sector;                 /* sector of this row */
+       int                     size;                   /* buffers size */
+       int                     pd_idx;                 /* parity disk index */
+       atomic_t                nr_pending;             /* nr of pending cmds */
+       unsigned long           state;                  /* state flags */
+       int                     cmd;                    /* stripe cmd */
+       int                     count;                  /* nr of waiters */
+       int                     write_method;           /* reconstruct-write / read-modify-write */
+       int                     phase;                  /* PHASE_BEGIN, ..., PHASE_COMPLETE */
+       struct wait_queue       *wait;                  /* processes waiting for this stripe */
+};
+
+/*
+ * Phase
+ */
+#define PHASE_BEGIN            0
+#define PHASE_READ_OLD         1
+#define PHASE_WRITE            2
+#define PHASE_READ             3
+#define PHASE_COMPLETE         4
+
+/*
+ * Write method
+ */
+#define METHOD_NONE            0
+#define RECONSTRUCT_WRITE      1
+#define READ_MODIFY_WRITE      2
+
+/*
+ * Stripe state
+ */
+#define STRIPE_LOCKED          0
+#define STRIPE_ERROR           1
+
+/*
+ * Stripe commands
+ */
+#define STRIPE_NONE            0
+#define        STRIPE_WRITE            1
+#define STRIPE_READ            2
+
+struct raid5_private_data {
+       struct stripe_head      **stripe_hashtbl;
+       mddev_t                 *mddev;
+       mdk_thread_t            *thread, *resync_thread;
+       struct disk_info        disks[MD_SB_DISKS];
+       struct disk_info        *spare;
+       int                     buffer_size;
+       int                     chunk_size, level, algorithm;
+       int                     raid_disks, working_disks, failed_disks;
+       int                     sector_count;
+       unsigned long           next_sector;
+       atomic_t                nr_handle;
+       struct stripe_head      *next_free_stripe;
+       int                     nr_stripes;
+       int                     resync_parity;
+       int                     max_nr_stripes;
+       int                     clock;
+       int                     nr_hashed_stripes;
+       int                     nr_locked_stripes;
+       int                     nr_pending_stripes;
+       int                     nr_cached_stripes;
+
+       /*
+        * Free stripes pool
+        */
+       int                     nr_free_sh;
+       struct stripe_head      *free_sh_list;
+       struct wait_queue       *wait_for_stripe;
+};
+
+typedef struct raid5_private_data raid5_conf_t;
+
+#define mddev_to_conf(mddev) ((raid5_conf_t *) mddev->private)
+
+/*
+ * Our supported algorithms
+ */
+#define ALGORITHM_LEFT_ASYMMETRIC      0
+#define ALGORITHM_RIGHT_ASYMMETRIC     1
+#define ALGORITHM_LEFT_SYMMETRIC       2
+#define ALGORITHM_RIGHT_SYMMETRIC      3
+
+#endif
--- linux/include/linux/raid/translucent.h.orig Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/translucent.h      Tue Jan 16 13:42:03 2001
@@ -0,0 +1,23 @@
+#ifndef _TRANSLUCENT_H
+#define _TRANSLUCENT_H
+
+#include <linux/raid/md.h>
+
+typedef struct dev_info dev_info_t;
+
+struct dev_info {
+       kdev_t          dev;
+       int             size;
+};
+
+struct translucent_private_data
+{
+       dev_info_t              disks[MD_SB_DISKS];
+};
+
+
+typedef struct translucent_private_data translucent_conf_t;
+
+#define mddev_to_conf(mddev) ((translucent_conf_t *) mddev->private)
+
+#endif
--- linux/include/linux/raid/xor.h.orig Tue Jan 16 13:42:03 2001
+++ linux/include/linux/raid/xor.h      Tue Jan 16 13:44:35 2001
@@ -0,0 +1,12 @@
+#ifndef _XOR_H
+#define _XOR_H
+
+#include <linux/raid/md.h>
+
+#define MAX_XOR_BLOCKS 5
+
+extern void calibrate_xor_block(void);
+extern void (*xor_block)(unsigned int count,
+                         struct buffer_head **bh_ptr);
+
+#endif
--- linux/include/linux/blkdev.h.orig   Mon Dec 11 01:49:44 2000
+++ linux/include/linux/blkdev.h        Tue Jan 16 13:47:19 2001
@@ -91,8 +91,9 @@
 extern void make_request(int major,int rw, struct buffer_head * bh);
 
 /* md needs this function to remap requests */
-extern int md_map (int minor, kdev_t *rdev, unsigned long *rsector, unsigned long size);
-extern int md_make_request (int minor, int rw, struct buffer_head * bh);
+extern int md_map (kdev_t dev, kdev_t *rdev,
+                                unsigned long *rsector, unsigned long size);
+extern int md_make_request (struct buffer_head * bh, int rw);
 extern int md_error (kdev_t mddev, kdev_t rdev);
 
 extern int * blk_size[MAX_BLKDEV];
--- linux/include/linux/fs.h.orig       Tue Jan 16 13:30:09 2001
+++ linux/include/linux/fs.h    Tue Jan 16 13:47:18 2001
@@ -191,6 +191,7 @@
 #define BH_Req         3       /* 0 if the buffer has been invalidated */
 #define BH_Protected   6       /* 1 if the buffer is protected */
 #define BH_Wait_IO     7       /* 1 if we should throttle on this buffer */
+#define BH_LowPrio     8       /* 1 if the buffer is lowprio */
 
 /*
  * Try to keep the most commonly used fields in single cache lines (16
@@ -784,6 +785,7 @@
 extern void refile_buffer(struct buffer_head * buf);
 extern void set_writetime(struct buffer_head * buf, int flag);
 extern int try_to_free_buffers(struct page *, int);
+extern void cache_drop_behind(struct buffer_head *bh);
 
 extern int nr_buffers;
 extern long buffermem;
@@ -814,6 +816,25 @@
        }
 }
 
+extern inline void mark_buffer_highprio(struct buffer_head * bh)
+{
+       clear_bit(BH_LowPrio, &bh->b_state);
+}
+
+extern inline void mark_buffer_lowprio(struct buffer_head * bh)
+{
+       /*
+        * dirty buffers cannot be marked lowprio.
+        */
+       if (!buffer_dirty(bh))
+               set_bit(BH_LowPrio, &bh->b_state);
+}
+
+static inline int buffer_lowprio(struct buffer_head * bh)
+{
+       return test_bit(BH_LowPrio, &bh->b_state);
+}
+
 extern inline void mark_buffer_dirty(struct buffer_head * bh, int flag)
 {
        if (!test_and_set_bit(BH_Dirty, &bh->b_state)) {
@@ -821,6 +842,23 @@
                if (bh->b_list != BUF_DIRTY)
                        refile_buffer(bh);
        }
+       /*
+        * if a buffer gets marked dirty then it has to lose
+        * it's lowprio state.
+        */
+       mark_buffer_highprio(bh);
+}
+
+extern inline void mark_buffer_dirty_lowprio(struct buffer_head * bh)
+{
+       if (!test_and_set_bit(BH_Dirty, &bh->b_state)) {
+               if (bh->b_list != BUF_DIRTY)
+                       refile_buffer(bh);
+               /*
+                * Mark it lowprio only if it was not dirty before!
+                */
+               set_bit(BH_LowPrio, &bh->b_state);
+       }
 }
 
 extern int check_disk_change(kdev_t dev);
@@ -898,6 +936,7 @@
 extern struct buffer_head * find_buffer(kdev_t dev, int block, int size);
 extern void ll_rw_block(int, int, struct buffer_head * bh[]);
 extern int is_read_only(kdev_t);
+extern int is_device_idle(kdev_t);
 extern void __brelse(struct buffer_head *);
 extern inline void brelse(struct buffer_head *buf)
 {
@@ -913,8 +952,12 @@
 extern void set_blocksize(kdev_t dev, int size);
 extern unsigned int get_hardblocksize(kdev_t dev);
 extern struct buffer_head * bread(kdev_t dev, int block, int size);
+extern struct buffer_head * buffer_ready (kdev_t dev, int block, int size);
+extern void bread_ahead (kdev_t dev, int block, int size);
 extern struct buffer_head * breada(kdev_t dev,int block, int size, 
                                   unsigned int pos, unsigned int filesize);
+extern struct buffer_head * breada_blocks(kdev_t dev,int block,
+                                               int size, int blocks);
 
 extern int brw_page(int, struct page *, kdev_t, int [], int, int);
 
--- linux/include/linux/md.h.orig       Fri May  8 09:17:13 1998
+++ linux/include/linux/md.h    Tue Jan 16 13:42:03 2001
@@ -1,300 +0,0 @@
-/*
-   md.h : Multiple Devices driver for Linux
-          Copyright (C) 1994-96 Marc ZYNGIER
-         <zyngier@ufr-info-p7.ibp.fr> or
-         <maz@gloups.fdn.fr>
-         
-   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, or (at your option)
-   any later version.
-   
-   You should have received a copy of the GNU General Public License
-   (for example /usr/src/linux/COPYING); if not, write to the Free
-   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
-*/
-
-#ifndef _MD_H
-#define _MD_H
-
-#include <linux/major.h>
-#include <linux/ioctl.h>
-#include <linux/types.h>
-
-/*
- * Different major versions are not compatible.
- * Different minor versions are only downward compatible.
- * Different patchlevel versions are downward and upward compatible.
- */
-#define MD_MAJOR_VERSION               0
-#define MD_MINOR_VERSION               36
-#define MD_PATCHLEVEL_VERSION          6
-
-#define MD_DEFAULT_DISK_READAHEAD      (256 * 1024)
-
-/* ioctls */
-#define REGISTER_DEV           _IO (MD_MAJOR, 1)
-#define START_MD               _IO (MD_MAJOR, 2)
-#define STOP_MD                _IO (MD_MAJOR, 3)
-#define REGISTER_DEV_NEW       _IO (MD_MAJOR, 4)
-
-/*
-   personalities :
-   Byte 0 : Chunk size factor
-   Byte 1 : Fault tolerance count for each physical device
-            (   0 means no fault tolerance,
-             0xFF means always tolerate faults), not used by now.
-   Byte 2 : Personality
-   Byte 3 : Reserved.
- */
-
-#define FAULT_SHIFT       8
-#define PERSONALITY_SHIFT 16
-
-#define FACTOR_MASK       0x000000FFUL
-#define FAULT_MASK        0x0000FF00UL
-#define PERSONALITY_MASK  0x00FF0000UL
-
-#define MD_RESERVED       0    /* Not used by now */
-#define LINEAR            (1UL << PERSONALITY_SHIFT)
-#define STRIPED           (2UL << PERSONALITY_SHIFT)
-#define RAID0             STRIPED
-#define RAID1             (3UL << PERSONALITY_SHIFT)
-#define RAID5             (4UL << PERSONALITY_SHIFT)
-#define MAX_PERSONALITY   5
-
-/*
- * MD superblock.
- *
- * The MD superblock maintains some statistics on each MD configuration.
- * Each real device in the MD set contains it near the end of the device.
- * Some of the ideas are copied from the ext2fs implementation.
- *
- * We currently use 4096 bytes as follows:
- *
- *     word offset     function
- *
- *        0  -    31   Constant generic MD device information.
- *        32  -    63   Generic state information.
- *       64  -   127   Personality specific information.
- *      128  -   511   12 32-words descriptors of the disks in the raid set.
- *      512  -   911   Reserved.
- *      912  -  1023   Disk specific descriptor.
- */
-
-/*
- * If x is the real device size in bytes, we return an apparent size of:
- *
- *     y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES
- *
- * and place the 4kB superblock at offset y.
- */
-#define MD_RESERVED_BYTES              (64 * 1024)
-#define MD_RESERVED_SECTORS            (MD_RESERVED_BYTES / 512)
-#define MD_RESERVED_BLOCKS             (MD_RESERVED_BYTES / BLOCK_SIZE)
-
-#define MD_NEW_SIZE_SECTORS(x)         ((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
-#define MD_NEW_SIZE_BLOCKS(x)          ((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS)
-
-#define MD_SB_BYTES                    4096
-#define MD_SB_WORDS                    (MD_SB_BYTES / 4)
-#define MD_SB_BLOCKS                   (MD_SB_BYTES / BLOCK_SIZE)
-#define MD_SB_SECTORS                  (MD_SB_BYTES / 512)
-
-/*
- * The following are counted in 32-bit words
- */
-#define        MD_SB_GENERIC_OFFSET            0
-#define MD_SB_PERSONALITY_OFFSET       64
-#define MD_SB_DISKS_OFFSET             128
-#define MD_SB_DESCRIPTOR_OFFSET                992
-
-#define MD_SB_GENERIC_CONSTANT_WORDS   32
-#define MD_SB_GENERIC_STATE_WORDS      32
-#define MD_SB_GENERIC_WORDS            (MD_SB_GENERIC_CONSTANT_WORDS + MD_SB_GENERIC_STATE_WORDS)
-#define MD_SB_PERSONALITY_WORDS                64
-#define MD_SB_DISKS_WORDS              384
-#define MD_SB_DESCRIPTOR_WORDS         32
-#define MD_SB_RESERVED_WORDS           (1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_WORDS - MD_SB_DESCRIPTOR_WORDS)
-#define MD_SB_EQUAL_WORDS              (MD_SB_GENERIC_WORDS + MD_SB_PERSONALITY_WORDS + MD_SB_DISKS_WORDS)
-#define MD_SB_DISKS                    (MD_SB_DISKS_WORDS / MD_SB_DESCRIPTOR_WORDS)
-
-/*
- * Device "operational" state bits
- */
-#define MD_FAULTY_DEVICE               0       /* Device is faulty / operational */
-#define MD_ACTIVE_DEVICE               1       /* Device is a part or the raid set / spare disk */
-#define MD_SYNC_DEVICE                 2       /* Device is in sync with the raid set */
-
-typedef struct md_device_descriptor_s {
-       __u32 number;           /* 0 Device number in the entire set */
-       __u32 major;            /* 1 Device major number */
-       __u32 minor;            /* 2 Device minor number */
-       __u32 raid_disk;        /* 3 The role of the device in the raid set */
-       __u32 state;            /* 4 Operational state */
-       __u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5];
-} md_descriptor_t;
-
-#define MD_SB_MAGIC            0xa92b4efc
-
-/*
- * Superblock state bits
- */
-#define MD_SB_CLEAN            0
-#define MD_SB_ERRORS           1
-
-typedef struct md_superblock_s {
-
-       /*
-        * Constant generic information
-        */
-       __u32 md_magic;         /*  0 MD identifier */
-       __u32 major_version;    /*  1 major version to which the set conforms */
-       __u32 minor_version;    /*  2 minor version to which the set conforms */
-       __u32 patch_version;    /*  3 patchlevel version to which the set conforms */
-       __u32 gvalid_words;     /*  4 Number of non-reserved words in this section */
-       __u32 set_magic;        /*  5 Raid set identifier */
-       __u32 ctime;            /*  6 Creation time */
-       __u32 level;            /*  7 Raid personality (mirroring, raid5, ...) */
-       __u32 size;             /*  8 Apparent size of each individual disk, in kB */
-       __u32 nr_disks;         /*  9 Number of total disks in the raid set */
-       __u32 raid_disks;       /* 10 Number of disks in a fully functional raid set */
-       __u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 11];
-
-       /*
-        * Generic state information
-        */
-       __u32 utime;            /*  0 Superblock update time */
-       __u32 state;            /*  1 State bits (clean, ...) */
-       __u32 active_disks;     /*  2 Number of currently active disks (some non-faulty disks might not be in sync) */
-       __u32 working_disks;    /*  3 Number of working disks */
-       __u32 failed_disks;     /*  4 Number of failed disks */
-       __u32 spare_disks;      /*  5 Number of spare disks */
-       __u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 6];
-
-       /*
-        * Personality information
-        */
-       __u32 parity_algorithm;
-       __u32 chunk_size;
-       __u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 2];
-
-       /*
-        * Disks information
-        */
-       md_descriptor_t disks[MD_SB_DISKS];
-
-       /*
-        * Reserved
-        */
-       __u32 reserved[MD_SB_RESERVED_WORDS];
-
-       /*
-        * Active descriptor
-        */
-       md_descriptor_t descriptor;
-} md_superblock_t;
-
-#ifdef __KERNEL__
-
-#include <linux/mm.h>
-#include <linux/fs.h>
-#include <linux/blkdev.h>
-#include <asm/semaphore.h>
-
-/*
- * Kernel-based reconstruction is mostly working, but still requires
- * some additional work.
- */
-#define SUPPORT_RECONSTRUCTION 0
-
-#define MAX_REAL     8         /* Max number of physical dev per md dev */
-#define MAX_MD_DEV   4         /* Max number of md dev */
-
-#define FACTOR(a)         ((a)->repartition & FACTOR_MASK)
-#define MAX_FAULT(a)      (((a)->repartition & FAULT_MASK)>>8)
-#define PERSONALITY(a)    ((a)->repartition & PERSONALITY_MASK)
-
-#define FACTOR_SHIFT(a) (PAGE_SHIFT + (a) - 10)
-
-struct real_dev
-{
-  kdev_t dev;                  /* Device number */
-  int size;                    /* Device size (in blocks) */
-  int offset;                  /* Real device offset (in blocks) in md dev
-                                  (only used in linear mode) */
-  struct inode *inode;         /* Lock inode */
-  md_superblock_t *sb;
-  u32 sb_offset;
-};
-
-struct md_dev;
-
-#define SPARE_INACTIVE 0
-#define SPARE_WRITE    1
-#define SPARE_ACTIVE   2
-
-struct md_personality
-{
-  char *name;
-  int (*map)(struct md_dev *mddev, kdev_t *rdev,
-                     unsigned long *rsector, unsigned long size);
-  int (*make_request)(struct md_dev *mddev, int rw, struct buffer_head * bh);
-  void (*end_request)(struct buffer_head * bh, int uptodate);
-  int (*run)(int minor, struct md_dev *mddev);
-  int (*stop)(int minor, struct md_dev *mddev);
-  int (*status)(char *page, int minor, struct md_dev *mddev);
-  int (*ioctl)(struct inode *inode, struct file *file,
-              unsigned int cmd, unsigned long arg);
-  int max_invalid_dev;
-  int (*error_handler)(struct md_dev *mddev, kdev_t dev);
-
-/*
- * Some personalities (RAID-1, RAID-5) can get disks hot-added and
- * hot-removed. Hot removal is different from failure. (failure marks
- * a disk inactive, but the disk is still part of the array)
- */
-  int (*hot_add_disk) (struct md_dev *mddev, kdev_t dev);
-  int (*hot_remove_disk) (struct md_dev *mddev, kdev_t dev);
-  int (*mark_spare) (struct md_dev *mddev, md_descriptor_t *descriptor, int state);
-};
-
-struct md_dev
-{
-  struct real_dev      devices[MAX_REAL];
-  struct md_personality        *pers;
-  md_superblock_t      *sb;
-  int                  sb_dirty;
-  int                  repartition;
-  int                  busy;
-  int                  nb_dev;
-  void                 *private;
-};
-
-struct md_thread {
-       void                    (*run) (void *data);
-       void                    *data;
-       struct wait_queue       *wqueue;
-       unsigned long           flags;
-       struct semaphore        *sem;
-       struct task_struct      *tsk;
-};
-
-#define THREAD_WAKEUP  0
-
-extern struct md_dev md_dev[MAX_MD_DEV];
-extern int md_size[MAX_MD_DEV];
-extern int md_maxreadahead[MAX_MD_DEV];
-
-extern char *partition_name (kdev_t dev);
-
-extern int register_md_personality (int p_num, struct md_personality *p);
-extern int unregister_md_personality (int p_num);
-extern struct md_thread *md_register_thread (void (*run) (void *data), void *data);
-extern void md_unregister_thread (struct md_thread *thread);
-extern void md_wakeup_thread(struct md_thread *thread);
-extern int md_update_sb (int minor);
-extern int md_do_sync(struct md_dev *mddev);
-
-#endif __KERNEL__
-#endif _MD_H
--- linux/include/linux/raid0.h.orig    Tue Oct 29 14:20:24 1996
+++ linux/include/linux/raid0.h Tue Jan 16 13:42:03 2001
@@ -1,27 +0,0 @@
-#ifndef _RAID0_H
-#define _RAID0_H
-
-struct strip_zone
-{
-  int zone_offset;             /* Zone offset in md_dev */
-  int dev_offset;              /* Zone offset in real dev */
-  int size;                    /* Zone size */
-  int nb_dev;                  /* Number of devices attached to the zone */
-  struct real_dev *dev[MAX_REAL]; /* Devices attached to the zone */
-};
-
-struct raid0_hash
-{
-  struct strip_zone *zone0, *zone1;
-};
-
-struct raid0_data
-{
-  struct raid0_hash *hash_table; /* Dynamically allocated */
-  struct strip_zone *strip_zone; /* This one too */
-  int nr_strip_zones;
-  struct strip_zone *smallest;
-  int nr_zones;
-};
-
-#endif
--- linux/include/linux/raid1.h.orig    Fri May  8 09:17:13 1998
+++ linux/include/linux/raid1.h Tue Jan 16 13:42:03 2001
@@ -1,49 +0,0 @@
-#ifndef _RAID1_H
-#define _RAID1_H
-
-#include <linux/md.h>
-
-struct mirror_info {
-       int             number;
-       int             raid_disk;
-       kdev_t          dev;
-       int             next;
-       int             sect_limit;
-
-       /*
-        * State bits:
-        */
-       int             operational;
-       int             write_only;
-       int             spare;
-};
-
-struct raid1_data {
-       struct md_dev *mddev;
-       struct mirror_info mirrors[MD_SB_DISKS];        /* RAID1 devices, 2 to MD_SB_DISKS */
-       int raid_disks;
-       int working_disks;                      /* Number of working disks */
-       int last_used;
-       unsigned long   next_sect;
-       int             sect_count;
-       int resync_running;
-};
-
-/*
- * this is our 'private' 'collective' RAID1 buffer head.
- * it contains information about what kind of IO operations were started
- * for this RAID5 operation, and about their status:
- */
-
-struct raid1_bh {
-       unsigned int            remaining;
-       int                     cmd;
-       unsigned long           state;
-       struct md_dev           *mddev;
-       struct buffer_head      *master_bh;
-       struct buffer_head      *mirror_bh [MD_SB_DISKS];
-       struct buffer_head      bh_req;
-       struct buffer_head      *next_retry;
-};
-
-#endif
--- linux/include/linux/raid5.h.orig    Fri May  8 09:17:13 1998
+++ linux/include/linux/raid5.h Tue Jan 16 13:42:03 2001
@@ -1,110 +0,0 @@
-#ifndef _RAID5_H
-#define _RAID5_H
-
-#ifdef __KERNEL__
-#include <linux/md.h>
-#include <asm/atomic.h>
-
-struct disk_info {
-       kdev_t  dev;
-       int     operational;
-       int     number;
-       int     raid_disk;
-       int     write_only;
-       int     spare;
-};
-
-struct stripe_head {
-       struct stripe_head      *hash_next, **hash_pprev; /* hash pointers */
-       struct stripe_head      *free_next;             /* pool of free sh's */
-       struct buffer_head      *buffer_pool;           /* pool of free buffers */
-       struct buffer_head      *bh_pool;               /* pool of free bh's */
-       struct raid5_data       *raid_conf;
-       struct buffer_head      *bh_old[MD_SB_DISKS];   /* disk image */
-       struct buffer_head      *bh_new[MD_SB_DISKS];   /* buffers of the MD device (present in buffer cache) */
-       struct buffer_head      *bh_copy[MD_SB_DISKS];  /* copy on write of bh_new (bh_new can change from under us) */
-       struct buffer_head      *bh_req[MD_SB_DISKS];   /* copy of bh_new (only the buffer heads), queued to the lower levels */
-       int                     cmd_new[MD_SB_DISKS];   /* READ/WRITE for new */
-       int                     new[MD_SB_DISKS];       /* buffer added since the last handle_stripe() */
-       unsigned long           sector;                 /* sector of this row */
-       int                     size;                   /* buffers size */
-       int                     pd_idx;                 /* parity disk index */
-       int                     nr_pending;             /* nr of pending cmds */
-       unsigned long           state;                  /* state flags */
-       int                     cmd;                    /* stripe cmd */
-       int                     count;                  /* nr of waiters */
-       int                     write_method;           /* reconstruct-write / read-modify-write */
-       int                     phase;                  /* PHASE_BEGIN, ..., PHASE_COMPLETE */
-       struct wait_queue       *wait;                  /* processes waiting for this stripe */
-};
-
-/*
- * Phase
- */
-#define PHASE_BEGIN            0
-#define PHASE_READ_OLD         1
-#define PHASE_WRITE            2
-#define PHASE_READ             3
-#define PHASE_COMPLETE         4
-
-/*
- * Write method
- */
-#define METHOD_NONE            0
-#define RECONSTRUCT_WRITE      1
-#define READ_MODIFY_WRITE      2
-
-/*
- * Stripe state
- */
-#define STRIPE_LOCKED          0
-#define STRIPE_ERROR           1
-
-/*
- * Stripe commands
- */
-#define STRIPE_NONE            0
-#define        STRIPE_WRITE            1
-#define STRIPE_READ            2
-
-struct raid5_data {
-       struct stripe_head      **stripe_hashtbl;
-       struct md_dev           *mddev;
-       struct md_thread        *thread, *resync_thread;
-       struct disk_info        disks[MD_SB_DISKS];
-       struct disk_info        *spare;
-       int                     buffer_size;
-       int                     chunk_size, level, algorithm;
-       int                     raid_disks, working_disks, failed_disks;
-       int                     sector_count;
-       unsigned long           next_sector;
-       atomic_t                nr_handle;
-       struct stripe_head      *next_free_stripe;
-       int                     nr_stripes;
-       int                     resync_parity;
-       int                     max_nr_stripes;
-       int                     clock;
-       int                     nr_hashed_stripes;
-       int                     nr_locked_stripes;
-       int                     nr_pending_stripes;
-       int                     nr_cached_stripes;
-
-       /*
-        * Free stripes pool
-        */
-       int                     nr_free_sh;
-       struct stripe_head      *free_sh_list;
-       struct wait_queue       *wait_for_stripe;
-};
-
-#endif
-
-/*
- * Our supported algorithms
- */
-#define ALGORITHM_LEFT_ASYMMETRIC      0
-#define ALGORITHM_RIGHT_ASYMMETRIC     1
-#define ALGORITHM_LEFT_SYMMETRIC       2
-#define ALGORITHM_RIGHT_SYMMETRIC      3
-
-#endif
--- linux/include/linux/sysctl.h.orig   Mon Dec 11 01:49:44 2000
+++ linux/include/linux/sysctl.h        Tue Jan 16 13:42:03 2001
@@ -435,6 +435,7 @@
 enum {
        DEV_CDROM=1,
        DEV_HWMON=2,
+       DEV_MD=3,
        DEV_MAC_HID=5
 };
 
@@ -446,6 +447,11 @@
        DEV_CDROM_DEBUG=4,
        DEV_CDROM_LOCK=5,
        DEV_CDROM_CHECK_MEDIA=6
+};
+
+/* /proc/sys/dev/md */
+enum {
+       DEV_MD_SPEED_LIMIT=1
 };
 
 /* /proc/sys/dev/mac_hid */
--- linux/include/asm-i386/md.h.orig    Fri May  8 09:17:13 1998
+++ linux/include/asm-i386/md.h Tue Jan 16 13:42:03 2001
@@ -1,13 +0,0 @@
-/* $Id$
- * md.h: High speed xor_block operation for RAID4/5 
- *
- */
- 
-#ifndef __ASM_MD_H
-#define __ASM_MD_H
-
-/* #define HAVE_ARCH_XORBLOCK */
-
-#define MD_XORBLOCK_ALIGNMENT  sizeof(long)
-
-#endif /* __ASM_MD_H */
--- linux/include/asm-alpha/md.h.orig   Fri May  8 09:17:13 1998
+++ linux/include/asm-alpha/md.h        Tue Jan 16 13:42:03 2001
@@ -1,13 +0,0 @@
-/* $Id$
- * md.h: High speed xor_block operation for RAID4/5 
- *
- */
- 
-#ifndef __ASM_MD_H
-#define __ASM_MD_H
-
-/* #define HAVE_ARCH_XORBLOCK */
-
-#define MD_XORBLOCK_ALIGNMENT  sizeof(long)
-
-#endif /* __ASM_MD_H */
--- linux/include/asm-m68k/md.h.orig    Fri May  8 09:15:22 1998
+++ linux/include/asm-m68k/md.h Tue Jan 16 13:42:04 2001
@@ -1,13 +0,0 @@
-/* $Id$
- * md.h: High speed xor_block operation for RAID4/5 
- *
- */
- 
-#ifndef __ASM_MD_H
-#define __ASM_MD_H
-
-/* #define HAVE_ARCH_XORBLOCK */
-
-#define MD_XORBLOCK_ALIGNMENT  sizeof(long)
-
-#endif /* __ASM_MD_H */
--- linux/include/asm-sparc/md.h.orig   Tue Jan 13 00:15:54 1998
+++ linux/include/asm-sparc/md.h        Tue Jan 16 13:42:04 2001
@@ -1,13 +0,0 @@
-/* $Id$
- * md.h: High speed xor_block operation for RAID4/5 
- *
- */
- 
-#ifndef __ASM_MD_H
-#define __ASM_MD_H
-
-/* #define HAVE_ARCH_XORBLOCK */
-
-#define MD_XORBLOCK_ALIGNMENT  sizeof(long)
-
-#endif /* __ASM_MD_H */
--- linux/include/asm-ppc/md.h.orig     Wed Oct 27 02:53:42 1999
+++ linux/include/asm-ppc/md.h  Tue Jan 16 13:42:04 2001
@@ -1,13 +0,0 @@
-/* $Id$
- * md.h: High speed xor_block operation for RAID4/5 
- *
- */
- 
-#ifndef __ASM_MD_H
-#define __ASM_MD_H
-
-/* #define HAVE_ARCH_XORBLOCK */
-
-#define MD_XORBLOCK_ALIGNMENT  sizeof(long)
-
-#endif /* __ASM_MD_H */
--- linux/include/asm-sparc64/md.h.orig Tue Jan 13 00:15:58 1998
+++ linux/include/asm-sparc64/md.h      Tue Jan 16 13:42:04 2001
@@ -1,91 +0,0 @@
-/* $Id$
- * md.h: High speed xor_block operation for RAID4/5 
- *            utilizing the UltraSparc Visual Instruction Set.
- *
- * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- */
- 
-#ifndef __ASM_MD_H
-#define __ASM_MD_H
-
-#include <asm/head.h>
-#include <asm/asi.h>
-
-#define HAVE_ARCH_XORBLOCK
-
-#define MD_XORBLOCK_ALIGNMENT  64
-
-/*     void __xor_block (char *dest, char *src, long len)
- *     {
- *             while (len--) *dest++ ^= *src++;
- *     }
- *
- *     Requirements:
- *     !(((long)dest | (long)src) & (MD_XORBLOCK_ALIGNMENT - 1)) &&
- *     !(len & 127) && len >= 256
- */
-
-static inline void __xor_block (char *dest, char *src, long len)
-{
-       __asm__ __volatile__ ("
-       wr      %%g0, %3, %%fprs
-       wr      %%g0, %4, %%asi
-       membar  #LoadStore|#StoreLoad|#StoreStore
-       sub     %2, 128, %2
-       ldda    [%0] %4, %%f0
-       ldda    [%1] %4, %%f16
-1:     ldda    [%0 + 64] %%asi, %%f32
-       fxor    %%f0, %%f16, %%f16
-       fxor    %%f2, %%f18, %%f18
-       fxor    %%f4, %%f20, %%f20
-       fxor    %%f6, %%f22, %%f22
-       fxor    %%f8, %%f24, %%f24
-       fxor    %%f10, %%f26, %%f26
-       fxor    %%f12, %%f28, %%f28
-       fxor    %%f14, %%f30, %%f30
-       stda    %%f16, [%0] %4
-       ldda    [%1 + 64] %%asi, %%f48
-       ldda    [%0 + 128] %%asi, %%f0
-       fxor    %%f32, %%f48, %%f48
-       fxor    %%f34, %%f50, %%f50
-       add     %0, 128, %0
-       fxor    %%f36, %%f52, %%f52
-       add     %1, 128, %1
-       fxor    %%f38, %%f54, %%f54
-       subcc   %2, 128, %2
-       fxor    %%f40, %%f56, %%f56
-       fxor    %%f42, %%f58, %%f58
-       fxor    %%f44, %%f60, %%f60
-       fxor    %%f46, %%f62, %%f62
-       stda    %%f48, [%0 - 64] %%asi
-       bne,pt  %%xcc, 1b
-        ldda   [%1] %4, %%f16
-       ldda    [%0 + 64] %%asi, %%f32
-       fxor    %%f0, %%f16, %%f16
-       fxor    %%f2, %%f18, %%f18
-       fxor    %%f4, %%f20, %%f20
-       fxor    %%f6, %%f22, %%f22
-       fxor    %%f8, %%f24, %%f24
-       fxor    %%f10, %%f26, %%f26
-       fxor    %%f12, %%f28, %%f28
-       fxor    %%f14, %%f30, %%f30
-       stda    %%f16, [%0] %4
-       ldda    [%1 + 64] %%asi, %%f48
-       membar  #Sync
-       fxor    %%f32, %%f48, %%f48
-       fxor    %%f34, %%f50, %%f50
-       fxor    %%f36, %%f52, %%f52
-       fxor    %%f38, %%f54, %%f54
-       fxor    %%f40, %%f56, %%f56
-       fxor    %%f42, %%f58, %%f58
-       fxor    %%f44, %%f60, %%f60
-       fxor    %%f46, %%f62, %%f62
-       stda    %%f48, [%0 + 64] %%asi
-       membar  #Sync|#StoreStore|#StoreLoad
-       wr      %%g0, 0, %%fprs
-       " : :
-       "r" (dest), "r" (src), "r" (len), "i" (FPRS_FEF), "i" (ASI_BLK_P) :
-       "cc", "memory");
-}
-
-#endif /* __ASM_MD_H */
--- linux/drivers/block/Config.in.orig  Mon Dec 11 01:49:41 2000
+++ linux/drivers/block/Config.in       Tue Jan 16 13:42:04 2001
@@ -103,10 +103,13 @@
 fi
 bool 'Multiple devices driver support' CONFIG_BLK_DEV_MD
 if [ "$CONFIG_BLK_DEV_MD" = "y" ]; then
+  bool 'Autodetect RAID partitions' CONFIG_AUTODETECT_RAID
   tristate '   Linear (append) mode' CONFIG_MD_LINEAR
   tristate '   RAID-0 (striping) mode' CONFIG_MD_STRIPED
   tristate '   RAID-1 (mirroring) mode' CONFIG_MD_MIRRORING
   tristate '   RAID-4/RAID-5 mode' CONFIG_MD_RAID5
+  tristate '   Translucent mode' CONFIG_MD_TRANSLUCENT
+  tristate '   Hierarchical Storage Management support' CONFIG_MD_HSM
 fi
 if [ "$CONFIG_MD_LINEAR" = "y" -o "$CONFIG_MD_STRIPED" = "y" ]; then
   bool '      Boot support (linear, striped)' CONFIG_MD_BOOT
--- linux/drivers/block/Makefile.orig   Mon Dec 11 01:49:41 2000
+++ linux/drivers/block/Makefile        Tue Jan 16 13:42:04 2001
@@ -294,10 +294,28 @@
 endif
 
 ifeq ($(CONFIG_MD_RAID5),y)
+LX_OBJS += xor.o
 L_OBJS += raid5.o
 else
   ifeq ($(CONFIG_MD_RAID5),m)
+  LX_OBJS += xor.o
   M_OBJS += raid5.o
+  endif
+endif
+
+ifeq ($(CONFIG_MD_TRANSLUCENT),y)
+L_OBJS += translucent.o
+else
+  ifeq ($(CONFIG_MD_TRANSLUCENT),m)
+  M_OBJS += translucent.o
+  endif
+endif
+
+ifeq ($(CONFIG_MD_HSM),y)
+L_OBJS += hsm.o
+else
+  ifeq ($(CONFIG_MD_HSM),m)
+  M_OBJS += hsm.o
   endif
 endif
 
--- linux/drivers/block/genhd.c.orig    Tue Jan 16 13:30:06 2001
+++ linux/drivers/block/genhd.c Tue Jan 16 13:42:04 2001
@@ -28,6 +28,7 @@
 #include <linux/string.h>
 #include <linux/blk.h>
 #include <linux/init.h>
+#include <linux/raid/md.h>
 
 #ifdef CONFIG_ARCH_S390
 #include <asm/dasd.h>
@@ -1785,6 +1786,9 @@
        else
 #endif
        rd_load();
+#endif
+#ifdef CONFIG_BLK_DEV_MD
+       autodetect_raid();
 #endif
 #ifdef CONFIG_MD_BOOT
         md_setup_drive();
--- linux/drivers/block/hsm.c.orig      Tue Jan 16 13:42:04 2001
+++ linux/drivers/block/hsm.c   Tue Jan 16 13:42:04 2001
@@ -0,0 +1,840 @@
+/*
+   hsm.c : HSM RAID driver for Linux
+              Copyright (C) 1998 Ingo Molnar
+
+   HSM mode management functions.
+
+   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, or (at your option)
+   any later version.
+   
+   You should have received a copy of the GNU General Public License
+   (for example /usr/src/linux/COPYING); if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
+*/
+
+#include <linux/module.h>
+
+#include <linux/raid/md.h>
+#include <linux/malloc.h>
+
+#include <linux/raid/hsm.h>
+#include <linux/blk.h>
+
+#define MAJOR_NR MD_MAJOR
+#define MD_DRIVER
+#define MD_PERSONALITY
+
+
+#define DEBUG_HSM 1
+
+#if DEBUG_HSM
+#define dprintk(x,y...) printk(x,##y)
+#else
+#define dprintk(x,y...) do { } while (0)
+#endif
+
+void print_bh(struct buffer_head *bh)
+{
+       dprintk("bh %p: %lx %lx %x %x %lx %p %lx %p %x %p %x %lx\n", bh, 
+               bh->b_blocknr, bh->b_size, bh->b_dev, bh->b_rdev,
+               bh->b_rsector, bh->b_this_page, bh->b_state,
+               bh->b_next_free, bh->b_count, bh->b_data,
+               bh->b_list, bh->b_flushtime
+       );
+}
+
+static int check_bg (pv_t *pv, pv_block_group_t * bg)
+{
+       int i, free = 0;
+
+       dprintk("checking bg ...\n");
+
+       for (i = 0; i < pv->pv_sb->pv_bg_size-1; i++) {
+               if (pv_pptr_free(bg->blocks + i)) {
+                       free++;
+                       if (test_bit(i, bg->used_bitmap)) {
+                               printk("hm, bit %d set?\n", i);
+                       }
+               } else {
+                       if (!test_bit(i, bg->used_bitmap)) {
+                               printk("hm, bit %d not set?\n", i);
+                       }
+               }
+       }
+       dprintk("%d free blocks in bg ...\n", free);
+       return free;
+}
+
+static void get_bg (pv_t *pv, pv_bg_desc_t *desc, int nr)
+{
+       unsigned int bg_pos = nr * pv->pv_sb->pv_bg_size + 2;
+       struct buffer_head *bh;
+
+       dprintk("... getting BG at %u ...\n", bg_pos);
+
+        bh = bread (pv->dev, bg_pos, HSM_BLOCKSIZE);
+       if (!bh) {
+               MD_BUG();
+               return;
+       }
+       desc->bg = (pv_block_group_t *) bh->b_data;
+       desc->free_blocks = check_bg(pv, desc->bg);
+}
+
+static int find_free_block (lv_t *lv, pv_t *pv, pv_bg_desc_t *desc, int nr,
+                               unsigned int lblock, lv_lptr_t * index)
+{
+       int i;
+
+       for (i = 0; i < pv->pv_sb->pv_bg_size-1; i++) {
+               pv_pptr_t * bptr = desc->bg->blocks + i;
+               if (pv_pptr_free(bptr)) {
+                       unsigned int bg_pos = nr * pv->pv_sb->pv_bg_size + 2;
+
+                       if (test_bit(i, desc->bg->used_bitmap)) {
+                               MD_BUG();
+                               continue;
+                       }
+                       bptr->u.used.owner.log_id = lv->log_id;
+                       bptr->u.used.owner.log_index = lblock;
+                       index->data.phys_nr = pv->phys_nr;
+                       index->data.phys_block = bg_pos + i + 1;
+                       set_bit(i, desc->bg->used_bitmap);
+                       desc->free_blocks--;
+                       dprintk(".....free blocks left in bg %p: %d\n",
+                                       desc->bg, desc->free_blocks);
+                       return 0;
+               }
+       }
+       return -ENOSPC;
+}
+
+static int __get_free_block (lv_t *lv, pv_t *pv,
+                                       unsigned int lblock, lv_lptr_t * index)
+{
+       int i;
+
+       dprintk("trying to get free block for lblock %d ...\n", lblock);
+
+       for (i = 0; i < pv->pv_sb->pv_block_groups; i++) {
+               pv_bg_desc_t *desc = pv->bg_array + i;
+
+               dprintk("looking at desc #%d (%p)...\n", i, desc->bg);
+               if (!desc->bg)
+                       get_bg(pv, desc, i);
+
+               if (desc->bg && desc->free_blocks)
+                       return find_free_block(lv, pv, desc, i,
+                                                       lblock, index);
+       }
+       dprintk("hsm: pv %s full!\n", partition_name(pv->dev));
+       return -ENOSPC;
+}
+
+static int get_free_block (lv_t *lv, unsigned int lblock, lv_lptr_t * index)
+{
+       int err;
+
+       if (!lv->free_indices)
+               return -ENOSPC;
+
+       /* fix me */
+       err = __get_free_block(lv, lv->vg->pv_array + 0, lblock, index);
+
+       if (err || !index->data.phys_block) {
+               MD_BUG();
+               return -ENOSPC;
+       }
+
+       lv->free_indices--;
+
+       return 0;
+}
+
+/*
+ * fix me: wordsize assumptions ...
+ */
+#define INDEX_BITS 8
+#define INDEX_DEPTH (32/INDEX_BITS)
+#define INDEX_MASK ((1<<INDEX_BITS) - 1)
+
+static void print_index_list (lv_t *lv, lv_lptr_t *index)
+{
+       lv_lptr_t *tmp;
+       int i;
+
+       dprintk("... block <%u,%u,%x> [.", index->data.phys_nr,
+               index->data.phys_block, index->cpu_addr);
+
+       tmp = index_child(index);
+       for (i = 0; i < HSM_LPTRS_PER_BLOCK; i++) {
+               if (index_block(lv, tmp))
+                       dprintk("(%d->%d)", i, index_block(lv, tmp));
+               tmp++;
+       }
+       dprintk(".]\n");
+}
+
+static int read_index_group (lv_t *lv, lv_lptr_t *index)
+{
+       lv_lptr_t *index_group, *tmp;
+       struct buffer_head *bh;
+       int i;
+
+       dprintk("reading index group <%s:%d>\n",
+               partition_name(index_dev(lv, index)), index_block(lv, index));
+
+       bh = bread(index_dev(lv, index), index_block(lv, index), HSM_BLOCKSIZE);
+       if (!bh) {
+               MD_BUG();
+               return -EIO;
+       }
+       if (!buffer_uptodate(bh))
+               MD_BUG();
+
+       index_group = (lv_lptr_t *) bh->b_data;
+       tmp = index_group;
+       for (i = 0; i < HSM_LPTRS_PER_BLOCK; i++) {
+               if (index_block(lv, tmp)) {
+                       dprintk("index group has BLOCK %d, non-present.\n", i);
+                       tmp->cpu_addr = 0;
+               }
+               tmp++;
+       }
+       index->cpu_addr = ptr_to_cpuaddr(index_group);
+
+       dprintk("have read index group %p at block %d.\n",
+                               index_group, index_block(lv, index));
+       print_index_list(lv, index);
+
+       return 0;
+}
+
+static int alloc_index_group (lv_t *lv, unsigned int lblock, lv_lptr_t * index)
+{
+       struct buffer_head *bh;
+       lv_lptr_t * index_group;
+       
+       if (get_free_block(lv, lblock, index))
+               return -ENOSPC;
+
+       dprintk("creating block for index group <%s:%d>\n",
+               partition_name(index_dev(lv, index)), index_block(lv, index));
+
+       bh = getblk(index_dev(lv, index),
+                        index_block(lv, index), HSM_BLOCKSIZE);
+
+       index_group = (lv_lptr_t *) bh->b_data;
+       md_clear_page(index_group);
+       mark_buffer_uptodate(bh, 1);
+
+       index->cpu_addr = ptr_to_cpuaddr(index_group);
+
+       dprintk("allocated index group %p at block %d.\n",
+                               index_group, index_block(lv, index));
+       return 0;
+}
+
+static lv_lptr_t * alloc_fixed_index (lv_t *lv, unsigned int lblock)
+{
+       lv_lptr_t * index = index_child(&lv->root_index);
+       int idx, l;
+
+       for (l = INDEX_DEPTH-1; l >= 0; l--) {
+               idx = (lblock >> (INDEX_BITS*l)) & INDEX_MASK;
+               index += idx;
+               if (!l)
+                       break;
+               if (!index_present(index)) {
+                       dprintk("no group, level %u, pos %u\n", l, idx);
+                       if (alloc_index_group(lv, lblock, index))
+                               return NULL;
+               }
+               index = index_child(index);
+       }
+       if (!index_block(lv,index)) {
+               dprintk("no data, pos %u\n", idx);
+               if (get_free_block(lv, lblock, index))
+                       return NULL;
+               return index;
+       }
+       MD_BUG();
+       return index;
+}
+
+static lv_lptr_t * find_index (lv_t *lv, unsigned int lblock)
+{
+       lv_lptr_t * index = index_child(&lv->root_index);
+       int idx, l;
+
+       for (l = INDEX_DEPTH-1; l >= 0; l--) {
+               idx = (lblock >> (INDEX_BITS*l)) & INDEX_MASK;
+               index += idx;
+               if (!l)
+                       break;
+               if (index_free(index))
+                       return NULL;
+               if (!index_present(index))
+                       read_index_group(lv, index);
+               if (!index_present(index)) {
+                       MD_BUG();
+                       return NULL;
+               }
+               index = index_child(index);
+       }
+       if (!index_block(lv,index))
+               return NULL;
+       return index;
+}
+
+static int read_root_index(lv_t *lv)
+{
+       int err;
+       lv_lptr_t *index = &lv->root_index;
+
+       if (!index_block(lv, index)) {
+               printk("LV has no root index yet, creating.\n");
+
+               err = alloc_index_group (lv, 0, index);
+               if (err) {
+                       printk("could not create index group, err:%d\n", err);
+                       return err;
+               }
+               lv->vg->vg_sb->lv_array[lv->log_id].lv_root_idx =
+                                       lv->root_index.data;
+       } else {
+               printk("LV already has a root index.\n");
+               printk("... at <%s:%d>.\n",
+                       partition_name(index_dev(lv, index)),
+                       index_block(lv, index));
+
+               read_index_group(lv, index);
+       }
+       return 0;
+}
+
+static int init_pv(pv_t *pv)
+{
+       struct buffer_head *bh;
+       pv_sb_t *pv_sb;
+
+        bh = bread (pv->dev, 0, HSM_BLOCKSIZE);
+       if (!bh) {
+               MD_BUG();
+               return -1;
+       }
+
+       pv_sb = (pv_sb_t *) bh->b_data;
+       pv->pv_sb = pv_sb;
+
+       if (pv_sb->pv_magic != HSM_PV_SB_MAGIC) {
+               printk("%s is not a PV, has magic %x instead of %x!\n",
+                       partition_name(pv->dev), pv_sb->pv_magic,
+                       HSM_PV_SB_MAGIC);
+               return -1;
+       }
+       printk("%s detected as a valid PV (#%d).\n", partition_name(pv->dev),
+                                                       pv->phys_nr);
+       printk("... created under HSM version %d.%d.%d, at %x.\n",
+           pv_sb->pv_major, pv_sb->pv_minor, pv_sb->pv_patch, pv_sb->pv_ctime);
+       printk("... total # of blocks: %d (%d left unallocated).\n",
+                        pv_sb->pv_total_size, pv_sb->pv_blocks_left);
+
+       printk("... block size: %d bytes.\n", pv_sb->pv_block_size);
+       printk("... block descriptor size: %d bytes.\n", pv_sb->pv_pptr_size);
+       printk("... block group size: %d blocks.\n", pv_sb->pv_bg_size);
+       printk("... # of block groups: %d.\n", pv_sb->pv_block_groups);
+
+       if (pv_sb->pv_block_groups*sizeof(pv_bg_desc_t) > PAGE_SIZE) {
+               MD_BUG();
+               return 1;
+       }
+       pv->bg_array = (pv_bg_desc_t *)__get_free_page(GFP_KERNEL);
+       if (!pv->bg_array) {
+               MD_BUG();
+               return 1;
+       }
+       memset(pv->bg_array, 0, PAGE_SIZE);
+
+       return 0;
+}
+
+static int free_pv(pv_t *pv)
+{
+       struct buffer_head *bh;
+
+       dprintk("freeing PV %d ...\n", pv->phys_nr);
+
+       if (pv->bg_array) {
+               int i;
+
+               dprintk(".... freeing BGs ...\n");
+               for (i = 0; i < pv->pv_sb->pv_block_groups; i++) {
+                       unsigned int bg_pos = i * pv->pv_sb->pv_bg_size + 2;
+                       pv_bg_desc_t *desc = pv->bg_array + i;
+
+                       if (desc->bg) {
+                               dprintk(".... freeing BG %d ...\n", i);
+                               bh = getblk (pv->dev, bg_pos, HSM_BLOCKSIZE);
+                               mark_buffer_dirty(bh, 1);
+                               brelse(bh);
+                               brelse(bh);
+                       }
+               }
+               free_page((unsigned long)pv->bg_array);
+       } else
+               MD_BUG();
+
+        bh = getblk (pv->dev, 0, HSM_BLOCKSIZE);
+       if (!bh) {
+               MD_BUG();
+               return -1;
+       }
+       mark_buffer_dirty(bh, 1);
+       brelse(bh);
+       brelse(bh);
+
+       return 0;
+}
+
+struct semaphore hsm_sem = MUTEX;
+
+#define HSM_SECTORS (HSM_BLOCKSIZE/512)
+
+static int hsm_map (mddev_t *mddev, kdev_t dev, kdev_t *rdev,
+                       unsigned long *rsector, unsigned long bsectors)
+{
+       lv_t *lv = kdev_to_lv(dev);
+       lv_lptr_t *index;
+       unsigned int lblock = *rsector / HSM_SECTORS;
+       unsigned int offset = *rsector % HSM_SECTORS;
+       int err = -EIO;
+
+       if (!lv) {
+               printk("HSM: md%d not a Logical Volume!\n", mdidx(mddev));
+               goto out;
+       }
+       if (offset + bsectors > HSM_SECTORS) {
+               MD_BUG();
+               goto out;
+       }
+       down(&hsm_sem);
+       index = find_index(lv, lblock);
+       if (!index) {
+               printk("no block %u yet ... allocating\n", lblock);
+               index = alloc_fixed_index(lv, lblock);
+       }
+
+       err = 0;
+
+       printk(" %u <%s : %ld(%ld)> -> ", lblock,
+               partition_name(*rdev), *rsector, bsectors);
+
+       *rdev = index_dev(lv, index);
+       *rsector = index_block(lv, index) * HSM_SECTORS + offset;
+
+       printk(" <%s : %ld> %u\n",
+               partition_name(*rdev), *rsector, index_block(lv, index));
+
+       up(&hsm_sem);
+out:
+       return err;
+}
+
+static void free_index (lv_t *lv, lv_lptr_t * index)
+{
+       struct buffer_head *bh;
+
+       printk("tryin to get cached block for index group <%s:%d>\n",
+               partition_name(index_dev(lv, index)), index_block(lv, index));
+
+       bh = getblk(index_dev(lv, index), index_block(lv, index),HSM_BLOCKSIZE);
+
+       printk("....FREEING ");
+       print_index_list(lv, index);
+
+       if (bh) {
+               if (!buffer_uptodate(bh))
+                       MD_BUG();
+               if ((lv_lptr_t *)bh->b_data != index_child(index)) {
+                       printk("huh? b_data is %p, index content is %p.\n",
+                               bh->b_data, index_child(index));
+               } else 
+                       printk("good, b_data == index content == %p.\n",
+                               index_child(index));
+               printk("b_count == %d, writing.\n", bh->b_count);
+               mark_buffer_dirty(bh, 1);
+               brelse(bh);
+               brelse(bh);
+               printk("done.\n");
+       } else {
+               printk("FAILED!\n");
+       }
+       print_index_list(lv, index);
+       index_child(index) = NULL;
+}
+
+static void free_index_group (lv_t *lv, int level, lv_lptr_t * index_0)
+{
+       char dots [3*8];
+       lv_lptr_t * index;
+       int i, nr_dots;
+
+       nr_dots = (INDEX_DEPTH-level)*3;
+       memcpy(dots,"...............",nr_dots);
+       dots[nr_dots] = 0;
+
+       dprintk("%s level %d index group block:\n", dots, level);
+
+
+       index = index_0;
+       for (i = 0; i < HSM_LPTRS_PER_BLOCK; i++) {
+               if (index->data.phys_block) {
+                       dprintk("%s block <%u,%u,%x>\n", dots,
+                               index->data.phys_nr,
+                               index->data.phys_block,
+                               index->cpu_addr);
+                       if (level && index_present(index)) {
+                               dprintk("%s==> deeper one level\n", dots);
+                               free_index_group(lv, level-1,
+                                               index_child(index));
+                               dprintk("%s freeing index group block %p ...",
+                                               dots, index_child(index));
+                               free_index(lv, index);
+                       }
+               }
+               index++;
+       }
+       dprintk("%s DONE: level %d index group block.\n", dots, level);
+}
+
+static void free_lv_indextree (lv_t *lv)
+{
+       dprintk("freeing LV %d ...\n", lv->log_id);
+       dprintk("..root index: %p\n", index_child(&lv->root_index));
+       dprintk("..INDEX TREE:\n");
+       free_index_group(lv, INDEX_DEPTH-1, index_child(&lv->root_index));
+       dprintk("..freeing root index %p ...", index_child(&lv->root_index));
+       dprintk("root block <%u,%u,%x>\n", lv->root_index.data.phys_nr,
+               lv->root_index.data.phys_block, lv->root_index.cpu_addr);
+       free_index(lv, &lv->root_index);
+       dprintk("..INDEX TREE done.\n");
+       fsync_dev(lv->vg->pv_array[0].dev); /* fix me */
+       lv->vg->vg_sb->lv_array[lv->log_id].lv_free_indices = lv->free_indices;
+}
+
+static void print_index_group (lv_t *lv, int level, lv_lptr_t * index_0)
+{
+       char dots [3*5];
+       lv_lptr_t * index;
+       int i, nr_dots;
+
+       nr_dots = (INDEX_DEPTH-level)*3;
+       memcpy(dots,"...............",nr_dots);
+       dots[nr_dots] = 0;
+
+       dprintk("%s level %d index group block:\n", dots, level);
+
+
+       for (i = 0; i < HSM_LPTRS_PER_BLOCK; i++) {
+               index = index_0 + i;
+               if (index->data.phys_block) {
+                       dprintk("%s block <%u,%u,%x>\n", dots,
+                               index->data.phys_nr,
+                               index->data.phys_block,
+                               index->cpu_addr);
+                       if (level && index_present(index)) {
+                               dprintk("%s==> deeper one level\n", dots);
+                               print_index_group(lv, level-1,
+                                                       index_child(index));
+                       }
+               }
+       }
+       dprintk("%s DONE: level %d index group block.\n", dots, level);
+}
+
+static void print_lv (lv_t *lv)
+{
+       dprintk("printing LV %d ...\n", lv->log_id);
+       dprintk("..root index: %p\n", index_child(&lv->root_index));
+       dprintk("..INDEX TREE:\n");
+       print_index_group(lv, INDEX_DEPTH-1, index_child(&lv->root_index));
+       dprintk("..INDEX TREE done.\n");
+}
+
+static int map_lv (lv_t *lv)
+{
+       kdev_t dev = lv->dev;
+       unsigned int nr = MINOR(dev);
+       mddev_t *mddev = lv->vg->mddev;
+
+       if (MAJOR(dev) != MD_MAJOR) {
+               MD_BUG();
+               return -1;
+       }
+       if (kdev_to_mddev(dev)) {
+               MD_BUG();
+               return -1;
+       }
+       md_hd_struct[nr].start_sect = 0;
+       md_hd_struct[nr].nr_sects = md_size[mdidx(mddev)] << 1;
+       md_size[nr] = md_size[mdidx(mddev)];
+       add_mddev_mapping(mddev, dev, lv);
+
+       return 0;
+}
+
+static int unmap_lv (lv_t *lv)
+{
+       kdev_t dev = lv->dev;
+       unsigned int nr = MINOR(dev);
+
+       if (MAJOR(dev) != MD_MAJOR) {
+               MD_BUG();
+               return -1;
+       }
+       md_hd_struct[nr].start_sect = 0;
+       md_hd_struct[nr].nr_sects = 0;
+       md_size[nr] = 0;
+       del_mddev_mapping(lv->vg->mddev, dev);
+
+       return 0;
+}
+
+static int init_vg (vg_t *vg)
+{
+       int i;
+       lv_t *lv;
+       kdev_t dev;
+       vg_sb_t *vg_sb;
+       struct buffer_head *bh;
+       lv_descriptor_t *lv_desc;
+
+       /*
+        * fix me: read all PVs and compare the SB
+        */
+        dev = vg->pv_array[0].dev;
+        bh = bread (dev, 1, HSM_BLOCKSIZE);
+       if (!bh) {
+               MD_BUG();
+               return -1;
+       }
+
+       vg_sb = (vg_sb_t *) bh->b_data;
+       vg->vg_sb = vg_sb;
+
+       if (vg_sb->vg_magic != HSM_VG_SB_MAGIC) {
+               printk("%s is not a valid VG, has magic %x instead of %x!\n",
+                       partition_name(dev), vg_sb->vg_magic,
+                       HSM_VG_SB_MAGIC);
+               return -1;
+       }
+
+       vg->nr_lv = 0;
+       for (i = 0; i < HSM_MAX_LVS_PER_VG; i++) {
+               unsigned int id;
+               lv_desc = vg->vg_sb->lv_array + i;
+
+               id = lv_desc->lv_id;
+               if (!id) {
+                       printk("... LV desc %d empty\n", i);
+                       continue;
+               }
+               if (id >= HSM_MAX_LVS_PER_VG) {
+                       MD_BUG();
+                       continue;
+               }
+
+               lv = vg->lv_array + id;
+               if (lv->vg) {
+                       MD_BUG();
+                       continue;
+               }
+               lv->log_id = id;
+               lv->vg = vg;
+               lv->max_indices = lv_desc->lv_max_indices;
+               lv->free_indices = lv_desc->lv_free_indices;
+               lv->root_index.data = lv_desc->lv_root_idx;
+               lv->dev = MKDEV(MD_MAJOR, lv_desc->md_id);
+
+               vg->nr_lv++;
+
+               map_lv(lv);
+               if (read_root_index(lv)) {
+                       vg->nr_lv--;
+                       unmap_lv(lv);
+                       memset(lv, 0, sizeof(*lv));
+               }
+       }
+       if (vg->nr_lv != vg_sb->nr_lvs)
+               MD_BUG();
+
+       return 0;
+}
+
+static int hsm_run (mddev_t *mddev)
+{
+       int i;
+       vg_t *vg;
+       mdk_rdev_t *rdev;
+
+       MOD_INC_USE_COUNT;
+
+       vg = kmalloc (sizeof (*vg), GFP_KERNEL);
+       if (!vg)
+               goto out;
+       memset(vg, 0, sizeof(*vg));
+       mddev->private = vg;
+       vg->mddev = mddev;
+
+       if (md_check_ordering(mddev)) {
+               printk("hsm: disks are not ordered, aborting!\n");
+               goto out;
+       }
+
+       set_blocksize (mddev_to_kdev(mddev), HSM_BLOCKSIZE);
+
+       vg->nr_pv = mddev->nb_dev;
+       ITERATE_RDEV_ORDERED(mddev,rdev,i) {
+               pv_t *pv = vg->pv_array + i;
+
+               pv->dev = rdev->dev;
+               fsync_dev (pv->dev);
+               set_blocksize (pv->dev, HSM_BLOCKSIZE);
+               pv->phys_nr = i;
+               if (init_pv(pv))
+                       goto out;
+       }
+
+       init_vg(vg);
+
+       return 0;
+
+out:
+       if (vg) {
+               kfree(vg);
+               mddev->private = NULL;
+       }
+       MOD_DEC_USE_COUNT;
+
+       return 1;
+}
+
+static int hsm_stop (mddev_t *mddev)
+{
+       lv_t *lv;
+       vg_t *vg;
+       int i;
+
+       vg = mddev_to_vg(mddev);
+
+       for (i = 0; i < HSM_MAX_LVS_PER_VG; i++) {
+               lv = vg->lv_array + i;
+               if (!lv->log_id)
+                       continue;
+               print_lv(lv);
+               free_lv_indextree(lv);
+               unmap_lv(lv);
+       }
+       for (i = 0; i < vg->nr_pv; i++)
+               free_pv(vg->pv_array + i);
+
+       kfree(vg);
+
+       MOD_DEC_USE_COUNT;
+
+       return 0;
+}
+
+
+static int hsm_status (char *page, mddev_t *mddev)
+{
+       int sz = 0, i;
+       lv_t *lv;
+       vg_t *vg;
+
+       vg = mddev_to_vg(mddev);
+
+       for (i = 0; i < HSM_MAX_LVS_PER_VG; i++) {
+               lv = vg->lv_array + i;
+               if (!lv->log_id)
+                       continue;
+               sz += sprintf(page+sz, "<LV%d %d/%d blocks used> ", lv->log_id,
+                       lv->max_indices - lv->free_indices, lv->max_indices);
+       }
+       return sz;
+}
+
+
+static mdk_personality_t hsm_personality=
+{
+       "hsm",
+       hsm_map,
+       NULL,
+       NULL,
+       hsm_run,
+       hsm_stop,
+       hsm_status,
+       NULL,
+       0,
+       NULL,
+       NULL,
+       NULL,
+       NULL
+};
+
+#ifndef MODULE
+
+md__initfunc(void hsm_init (void))
+{
+       register_md_personality (HSM, &hsm_personality);
+}
+
+#else
+
+int init_module (void)
+{
+       return (register_md_personality (HSM, &hsm_personality));
+}
+
+void cleanup_module (void)
+{
+       unregister_md_personality (HSM);
+}
+
+#endif
+
+/*
+ * This Linus-trick catches bugs via the linker.
+ */
+
+extern void __BUG__in__hsm_dot_c_1(void);
+extern void __BUG__in__hsm_dot_c_2(void);
+extern void __BUG__in__hsm_dot_c_3(void);
+extern void __BUG__in__hsm_dot_c_4(void);
+extern void __BUG__in__hsm_dot_c_5(void);
+extern void __BUG__in__hsm_dot_c_6(void);
+extern void __BUG__in__hsm_dot_c_7(void);
+ 
+void bugcatcher (void)
+{
+        if (sizeof(pv_block_group_t) != HSM_BLOCKSIZE)
+                __BUG__in__hsm_dot_c_1();
+        if (sizeof(lv_index_block_t) != HSM_BLOCKSIZE)
+                __BUG__in__hsm_dot_c_2();
+
+        if (sizeof(pv_sb_t) != HSM_BLOCKSIZE)
+                __BUG__in__hsm_dot_c_4();
+        if (sizeof(lv_sb_t) != HSM_BLOCKSIZE)
+                __BUG__in__hsm_dot_c_3();
+       if (sizeof(vg_sb_t) != HSM_BLOCKSIZE)
+                __BUG__in__hsm_dot_c_6();
+
+       if (sizeof(lv_lptr_t) != 16)
+                __BUG__in__hsm_dot_c_5();
+       if (sizeof(pv_pptr_t) != 16)
+                __BUG__in__hsm_dot_c_6();
+}
+
--- linux/drivers/block/linear.c.orig   Sat Nov  8 20:39:12 1997
+++ linux/drivers/block/linear.c        Tue Jan 16 13:42:04 2001
@@ -1,4 +1,3 @@
-
 /*
    linear.c : Multiple Devices driver for Linux
               Copyright (C) 1994-96 Marc ZYNGIER
@@ -19,186 +18,207 @@
 
 #include <linux/module.h>
 
-#include <linux/md.h>
+#include <linux/raid/md.h>
 #include <linux/malloc.h>
-#include <linux/init.h>
 
-#include "linear.h"
+#include <linux/raid/linear.h>
 
 #define MAJOR_NR MD_MAJOR
 #define MD_DRIVER
 #define MD_PERSONALITY
 
-static int linear_run (int minor, struct md_dev *mddev)
+static int linear_run (mddev_t *mddev)
 {
-  int cur=0, i, size, dev0_size, nb_zone;
-  struct linear_data *data;
-
-  MOD_INC_USE_COUNT;
-
-  mddev->private=kmalloc (sizeof (struct linear_data), GFP_KERNEL);
-  data=(struct linear_data *) mddev->private;
-
-  /*
-     Find out the smallest device. This was previously done
-     at registry time, but since it violates modularity,
-     I moved it here... Any comment ? ;-)
-   */
-
-  data->smallest=mddev->devices;
-  for (i=1; i<mddev->nb_dev; i++)
-    if (data->smallest->size > mddev->devices[i].size)
-      data->smallest=mddev->devices+i;
-  
-  nb_zone=data->nr_zones=
-    md_size[minor]/data->smallest->size +
-    (md_size[minor]%data->smallest->size ? 1 : 0);
-  
-  data->hash_table=kmalloc (sizeof (struct linear_hash)*nb_zone, GFP_KERNEL);
-
-  size=mddev->devices[cur].size;
+       linear_conf_t *conf;
+       struct linear_hash *table;
+       mdk_rdev_t *rdev;
+       int size, i, j, nb_zone;
+       unsigned int curr_offset;
+
+       MOD_INC_USE_COUNT;
+
+       conf = kmalloc (sizeof (*conf), GFP_KERNEL);
+       if (!conf)
+               goto out;
+       mddev->private = conf;
+
+       if (md_check_ordering(mddev)) {
+               printk("linear: disks are not ordered, aborting!\n");
+               goto out;
+       }
+       /*
+        * Find the smallest device.
+        */
+
+       conf->smallest = NULL;
+       curr_offset = 0;
+       ITERATE_RDEV_ORDERED(mddev,rdev,j) {
+               dev_info_t *disk = conf->disks + j;
+
+               disk->dev = rdev->dev;
+               disk->size = rdev->size;
+               disk->offset = curr_offset;
+
+               curr_offset += disk->size;
+
+               if (!conf->smallest || (disk->size < conf->smallest->size))
+                       conf->smallest = disk;
+       }
+
+       nb_zone = conf->nr_zones =
+               md_size[mdidx(mddev)] / conf->smallest->size +
+               ((md_size[mdidx(mddev)] % conf->smallest->size) ? 1 : 0);
+  
+       conf->hash_table = kmalloc (sizeof (struct linear_hash) * nb_zone,
+                                       GFP_KERNEL);
+       if (!conf->hash_table)
+               goto out;
+
+       /*
+        * Here we generate the linear hash table
+        */
+       table = conf->hash_table;
+       i = 0;
+       size = 0;
+       for (j = 0; j < mddev->nb_dev; j++) {
+               dev_info_t *disk = conf->disks + j;
+
+               if (size < 0) {
+                       table->dev1 = disk;
+                       table++;
+               }
+               size += disk->size;
+
+               while (size) {
+                       table->dev0 = disk;
+                       size -= conf->smallest->size;
+                       if (size < 0)
+                               break;
+                       table->dev1 = NULL;
+                       table++;
+               }
+       }
+       table->dev1 = NULL;
+
+       return 0;
+
+out:
+       if (conf)
+               kfree(conf);
+       MOD_DEC_USE_COUNT;
+       return 1;
+}
+
+static int linear_stop (mddev_t *mddev)
+{
+       linear_conf_t *conf = mddev_to_conf(mddev);
+  
+       kfree(conf->hash_table);
+       kfree(conf);
 
-  i=0;
-  while (cur<mddev->nb_dev)
-  {
-    data->hash_table[i].dev0=mddev->devices+cur;
+       MOD_DEC_USE_COUNT;
 
-    if (size>=data->smallest->size) /* If we completely fill the slot */
-    {
-      data->hash_table[i++].dev1=NULL;
-      size-=data->smallest->size;
-
-      if (!size)
-      {
-       if (++cur==mddev->nb_dev) continue;
-       size=mddev->devices[cur].size;
-      }
-
-      continue;
-    }
-
-    if (++cur==mddev->nb_dev) /* Last dev, set dev1 as NULL */
-    {
-      data->hash_table[i].dev1=NULL;
-      continue;
-    }
-
-    dev0_size=size;            /* Here, we use a 2nd dev to fill the slot */
-    size=mddev->devices[cur].size;
-    data->hash_table[i++].dev1=mddev->devices+cur;
-    size-=(data->smallest->size - dev0_size);
-  }
-
-  return 0;
-}
-
-static int linear_stop (int minor, struct md_dev *mddev)
-{
-  struct linear_data *data=(struct linear_data *) mddev->private;
-  
-  kfree (data->hash_table);
-  kfree (data);
-
-  MOD_DEC_USE_COUNT;
-
-  return 0;
+       return 0;
 }
 
 
-static int linear_map (struct md_dev *mddev, kdev_t *rdev,
+static int linear_map (mddev_t *mddev, kdev_t dev, kdev_t *rdev,
                       unsigned long *rsector, unsigned long size)
 {
-  struct linear_data *data=(struct linear_data *) mddev->private;
-  struct linear_hash *hash;
-  struct real_dev *tmp_dev;
-  long block;
-
-  block=*rsector >> 1;
-  hash=data->hash_table+(block/data->smallest->size);
-  
-  if (block >= (hash->dev0->size + hash->dev0->offset))
-  {
-    if (!hash->dev1)
-    {
-      printk ("linear_map : hash->dev1==NULL for block %ld\n", block);
-      return (-1);
-    }
-    
-    tmp_dev=hash->dev1;
-  }
-  else
-    tmp_dev=hash->dev0;
+       linear_conf_t *conf = mddev_to_conf(mddev);
+       struct linear_hash *hash;
+       dev_info_t *tmp_dev;
+       long block;
+
+       block = *rsector >> 1;
+       hash = conf->hash_table + (block / conf->smallest->size);
+  
+       if (block >= (hash->dev0->size + hash->dev0->offset))
+       {
+               if (!hash->dev1)
+               {
+                       printk ("linear_map : hash->dev1==NULL for block %ld\n",
+                                               block);
+                       return -1;
+               }
+               tmp_dev = hash->dev1;
+       } else
+               tmp_dev = hash->dev0;
     
-  if (block >= (tmp_dev->size + tmp_dev->offset) || block < tmp_dev->offset)
-    printk ("Block %ld out of bounds on dev %s size %d offset %d\n",
-           block, kdevname(tmp_dev->dev), tmp_dev->size, tmp_dev->offset);
+       if (block >= (tmp_dev->size + tmp_dev->offset)
+                               || block < tmp_dev->offset)
+       printk ("Block %ld out of bounds on dev %s size %d offset %d\n",
+               block, kdevname(tmp_dev->dev), tmp_dev->size, tmp_dev->offset);
   
-  *rdev=tmp_dev->dev;
-  *rsector=(block-(tmp_dev->offset)) << 1;
+       *rdev = tmp_dev->dev;
+       *rsector = (block - tmp_dev->offset) << 1;
 
-  return (0);
+       return 0;
 }
 
-static int linear_status (char *page, int minor, struct md_dev *mddev)
+static int linear_status (char *page, mddev_t *mddev)
 {
-  int sz=0;
+       int sz=0;
 
 #undef MD_DEBUG
 #ifdef MD_DEBUG
-  int j;
-  struct linear_data *data=(struct linear_data *) mddev->private;
+       int j;
+       linear_conf_t *conf = mddev_to_conf(mddev);
   
-  sz+=sprintf (page+sz, "      ");
-  for (j=0; j<data->nr_zones; j++)
-  {
-    sz+=sprintf (page+sz, "[%s",
-                partition_name (data->hash_table[j].dev0->dev));
-
-    if (data->hash_table[j].dev1)
-      sz+=sprintf (page+sz, "/%s] ",
-                  partition_name(data->hash_table[j].dev1->dev));
-    else
-      sz+=sprintf (page+sz, "] ");
-  }
-
-  sz+=sprintf (page+sz, "\n");
+       sz += sprintf(page+sz, "      ");
+       for (j = 0; j < conf->nr_zones; j++)
+       {
+               sz += sprintf(page+sz, "[%s",
+                       partition_name(conf->hash_table[j].dev0->dev));
+
+               if (conf->hash_table[j].dev1)
+                       sz += sprintf(page+sz, "/%s] ",
+                         partition_name(conf->hash_table[j].dev1->dev));
+               else
+                       sz += sprintf(page+sz, "] ");
+       }
+       sz += sprintf(page+sz, "\n");
 #endif
-  sz+=sprintf (page+sz, " %dk rounding", 1<<FACTOR_SHIFT(FACTOR(mddev)));
-  return sz;
+       sz += sprintf(page+sz, " %dk rounding", mddev->param.chunk_size/1024);
+       return sz;
 }
 
 
-static struct md_personality linear_personality=
+static mdk_personality_t linear_personality=
 {
-  "linear",
-  linear_map,
-  NULL,
-  NULL,
-  linear_run,
-  linear_stop,
-  linear_status,
-  NULL,                                /* no ioctls */
-  0
+       "linear",
+       linear_map,
+       NULL,
+       NULL,
+       linear_run,
+       linear_stop,
+       linear_status,
+       NULL,
+       0,
+       NULL,
+       NULL,
+       NULL,
+       NULL
 };
 
-
 #ifndef MODULE
 
-__initfunc(void linear_init (void))
+md__initfunc(void linear_init (void))
 {
-  register_md_personality (LINEAR, &linear_personality);
+       register_md_personality (LINEAR, &linear_personality);
 }
 
 #else
 
 int init_module (void)
 {
-  return (register_md_personality (LINEAR, &linear_personality));
+       return (register_md_personality (LINEAR, &linear_personality));
 }
 
 void cleanup_module (void)
 {
-  unregister_md_personality (LINEAR);
+       unregister_md_personality (LINEAR);
 }
 
 #endif
+
--- linux/drivers/block/linear.h.orig   Fri Nov 22 15:07:23 1996
+++ linux/drivers/block/linear.h        Tue Jan 16 13:42:04 2001
@@ -1,16 +0,0 @@
-#ifndef _LINEAR_H
-#define _LINEAR_H
-
-struct linear_hash
-{
-  struct real_dev *dev0, *dev1;
-};
-
-struct linear_data
-{
-  struct linear_hash *hash_table; /* Dynamically allocated */
-  struct real_dev *smallest;
-  int nr_zones;
-};
-
-#endif
--- linux/drivers/block/ll_rw_blk.c.orig        Mon Dec 11 01:49:41 2000
+++ linux/drivers/block/ll_rw_blk.c     Tue Jan 16 13:42:04 2001
@@ -23,6 +23,7 @@
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <linux/blk.h>
+#include <linux/raid/md.h>
 
 #include <linux/module.h>
 
@@ -53,6 +54,11 @@
 spinlock_t io_request_lock = SPIN_LOCK_UNLOCKED;
 
 /*
+ * per-major idle-IO detection
+ */
+unsigned long io_events[MAX_BLKDEV] = {0, };
+
+/*
  * used to wait on when there are no free requests
  */
 struct wait_queue * wait_for_request;
@@ -583,6 +589,8 @@
                return;
        /* Maybe the above fixes it, and maybe it doesn't boot. Life is interesting */
        lock_buffer(bh);
+       if (!buffer_lowprio(bh))
+               io_events[major]++;
 
        if (blk_size[major]) {
                unsigned long maxsector = (blk_size[major][MINOR(bh->b_rdev)] << 1) + 1;
@@ -832,7 +840,7 @@
                bh[i]->b_rsector=bh[i]->b_blocknr*(bh[i]->b_size >> 9);
 #ifdef CONFIG_BLK_DEV_MD
                if (major==MD_MAJOR &&
-                   md_map (MINOR(bh[i]->b_dev), &bh[i]->b_rdev,
+                       md_map (bh[i]->b_dev, &bh[i]->b_rdev,
                            &bh[i]->b_rsector, bh[i]->b_size >> 9)) {
                        printk (KERN_ERR
                                "Bad md_map in ll_rw_block\n");
@@ -852,7 +860,7 @@
                        set_bit(BH_Req, &bh[i]->b_state);
 #ifdef CONFIG_BLK_DEV_MD
                        if (MAJOR(bh[i]->b_dev) == MD_MAJOR) {
-                               md_make_request(MINOR (bh[i]->b_dev), rw, bh[i]);
+                               md_make_request(bh[i], rw);
                                continue;
                        }
 #endif
--- linux/drivers/block/md.c.orig       Mon Sep  4 19:39:16 2000
+++ linux/drivers/block/md.c    Tue Jan 16 13:42:04 2001
@@ -1,21 +1,17 @@
-
 /*
    md.c : Multiple Devices driver for Linux
-          Copyright (C) 1994-96 Marc ZYNGIER
-         <zyngier@ufr-info-p7.ibp.fr> or
-         <maz@gloups.fdn.fr>
+          Copyright (C) 1998, 1999 Ingo Molnar
 
-   A lot of inspiration came from hd.c ...
+     completely rewritten, based on the MD driver code from Marc Zyngier
 
-   kerneld support by Boris Tobotras <boris@xtalk.msk.su>
-   boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
+   Changes:
 
-   RAID-1/RAID-5 extensions by:
-        Ingo Molnar, Miguel de Icaza, Gadi Oxman
+   - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
+   - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
+   - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
+   - kmod support by: Cyrus Durgin
+   - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
 
-   Changes for kmod by:
-       Cyrus Durgin
-   
    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, or (at your option)
@@ -26,807 +22,3007 @@
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
 */
 
-/*
- * Current RAID-1,4,5 parallel reconstruction speed limit is 1024 KB/sec, so
- * the extra system load does not show up that much. Increase it if your
- * system can take more.
- */
-#define SPEED_LIMIT 1024
+#include <linux/raid/md.h>
+#include <linux/raid/xor.h>
 
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/version.h>
-#include <linux/malloc.h>
-#include <linux/mm.h>
-#include <linux/md.h>
-#include <linux/hdreg.h>
-#include <linux/stat.h>
-#include <linux/fs.h>
-#include <linux/proc_fs.h>
-#include <linux/blkdev.h>
-#include <linux/genhd.h>
-#include <linux/smp_lock.h>
 #ifdef CONFIG_KMOD
 #include <linux/kmod.h>
 #endif
-#include <linux/errno.h>
-#include <linux/init.h>
 
 #define __KERNEL_SYSCALLS__
 #include <linux/unistd.h>
 
+#include <asm/unaligned.h>
+
+extern asmlinkage int sys_sched_yield(void);
+extern asmlinkage int sys_setsid(void);
+
+extern unsigned long io_events[MAX_BLKDEV];
+
 #define MAJOR_NR MD_MAJOR
 #define MD_DRIVER
 
 #include <linux/blk.h>
-#include <asm/uaccess.h>
-#include <asm/bitops.h>
-#include <asm/atomic.h>
 
 #ifdef CONFIG_MD_BOOT
-extern kdev_t name_to_kdev_t(char *line) __init;
+extern kdev_t name_to_kdev_t(char *line) md__init;
 #endif
 
-static struct hd_struct md_hd_struct[MAX_MD_DEV];
-static int md_blocksizes[MAX_MD_DEV];
-int md_maxreadahead[MAX_MD_DEV];
-#if SUPPORT_RECONSTRUCTION
-static struct md_thread *md_sync_thread = NULL;
-#endif /* SUPPORT_RECONSTRUCTION */
+static mdk_personality_t *pers[MAX_PERSONALITY] = {NULL, };
+
+/*
+ * these have to be allocated separately because external
+ * subsystems want to have a pre-defined structure
+ */
+struct hd_struct md_hd_struct[MAX_MD_DEVS];
+static int md_blocksizes[MAX_MD_DEVS];
+static int md_maxreadahead[MAX_MD_DEVS];
+static mdk_thread_t *md_recovery_thread = NULL;
 
-int md_size[MAX_MD_DEV]={0, };
+int md_size[MAX_MD_DEVS] = {0, };
 
 static void md_geninit (struct gendisk *);
 
 static struct gendisk md_gendisk=
 {
-  MD_MAJOR,
-  "md",
-  0,
-  1,
-  MAX_MD_DEV,
-  md_geninit,
-  md_hd_struct,
-  md_size,
-  MAX_MD_DEV,
-  NULL,
-  NULL
+       MD_MAJOR,
+       "md",
+       0,
+       1,
+       MAX_MD_DEVS,
+       md_geninit,
+       md_hd_struct,
+       md_size,
+       MAX_MD_DEVS,
+       NULL,
+       NULL
 };
 
-static struct md_personality *pers[MAX_PERSONALITY]={NULL, };
-struct md_dev md_dev[MAX_MD_DEV];
-
-int md_thread(void * arg);
+/*
+ * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
+ * is 100 KB/sec, so the extra system load does not show up that much.
+ * Increase it if you want to have more _guaranteed_ speed. Note that
+ * the RAID driver will use the maximum available bandwith if the IO
+ * subsystem is idle.
+ *
+ * you can change it via /proc/sys/dev/speed-limit
+ */
 
-static struct gendisk *find_gendisk (kdev_t dev)
-{
-  struct gendisk *tmp=gendisk_head;
+static int sysctl_speed_limit = 100;
 
-  while (tmp != NULL)
-  {
-    if (tmp->major==MAJOR(dev))
-      return (tmp);
-    
-    tmp=tmp->next;
-  }
+static struct ctl_table_header *md_table_header;
 
-  return (NULL);
-}
+static ctl_table md_table[] = {
+       {DEV_MD_SPEED_LIMIT, "speed-limit",
+        &sysctl_speed_limit, sizeof(int), 0644, NULL, &proc_dointvec},
+       {0}
+};
 
-char *partition_name (kdev_t dev)
-{
-  static char name[40];                /* This should be long
-                                  enough for a device name ! */
-  struct gendisk *hd = find_gendisk (dev);
+static ctl_table md_dir_table[] = {
+        {DEV_MD, "md", NULL, 0, 0555, md_table},
+        {0}
+};
 
-  if (!hd)
-  {
-    sprintf (name, "[dev %s]", kdevname(dev));
-    return (name);
-  }
+static ctl_table md_root_table[] = {
+        {CTL_DEV, "dev", NULL, 0, 0555, md_dir_table},
+        {0}
+};
 
-  return disk_name (hd, MINOR(dev), name);  /* routine in genhd.c */
+static void md_register_sysctl(void)
+{
+        md_table_header = register_sysctl_table(md_root_table, 1);
 }
 
-static int legacy_raid_sb (int minor, int pnum)
+void md_unregister_sysctl(void)
 {
-       int i, factor;
+        unregister_sysctl_table(md_table_header);
+}
+
+/*
+ * The mapping between kdev and mddev is not necessary a simple
+ * one! Eg. HSM uses several sub-devices to implement Logical
+ * Volumes. All these sub-devices map to the same mddev.
+ */
+dev_mapping_t mddev_map [MAX_MD_DEVS] = { {NULL, 0}, };
 
-       factor = 1 << FACTOR_SHIFT(FACTOR((md_dev+minor)));
+void add_mddev_mapping (mddev_t * mddev, kdev_t dev, void *data)
+{
+       unsigned int minor = MINOR(dev);
 
-       /*****
-        * do size and offset calculations.
-        */
-       for (i=0; i<md_dev[minor].nb_dev; i++) {
-               md_dev[minor].devices[i].size &= ~(factor - 1);
-               md_size[minor] += md_dev[minor].devices[i].size;
-               md_dev[minor].devices[i].offset=i ? (md_dev[minor].devices[i-1].offset + 
-                                                       md_dev[minor].devices[i-1].size) : 0;
+       if (MAJOR(dev) != MD_MAJOR) {
+               MD_BUG();
+               return;
        }
-       if (pnum == RAID0 >> PERSONALITY_SHIFT)
-               md_maxreadahead[minor] = MD_DEFAULT_DISK_READAHEAD * md_dev[minor].nb_dev;
-       return 0;
+       if (mddev_map[minor].mddev != NULL) {
+               MD_BUG();
+               return;
+       }
+       mddev_map[minor].mddev = mddev;
+       mddev_map[minor].data = data;
 }
 
-static void free_sb (struct md_dev *mddev)
+void del_mddev_mapping (mddev_t * mddev, kdev_t dev)
 {
-       int i;
-       struct real_dev *realdev;
+       unsigned int minor = MINOR(dev);
 
-       if (mddev->sb) {
-               free_page((unsigned long) mddev->sb);
-               mddev->sb = NULL;
+       if (MAJOR(dev) != MD_MAJOR) {
+               MD_BUG();
+               return;
        }
-       for (i = 0; i <mddev->nb_dev; i++) {
-               realdev = mddev->devices + i;
-               if (realdev->sb) {
-                       free_page((unsigned long) realdev->sb);
-                       realdev->sb = NULL;
-               }
+       if (mddev_map[minor].mddev != mddev) {
+               MD_BUG();
+               return;
        }
+       mddev_map[minor].mddev = NULL;
+       mddev_map[minor].data = NULL;
 }
 
 /*
- * Check one RAID superblock for generic plausibility
+ * Enables to iterate over all existing md arrays
  */
+static MD_LIST_HEAD(all_mddevs);
 
-#define BAD_MAGIC KERN_ERR \
-"md: %s: invalid raid superblock magic (%x) on block %u\n"
+static mddev_t * alloc_mddev (kdev_t dev)
+{
+       mddev_t * mddev;
 
-#define OUT_OF_MEM KERN_ALERT \
-"md: out of memory.\n"
+       if (MAJOR(dev) != MD_MAJOR) {
+               MD_BUG();
+               return 0;
+       }
+       mddev = (mddev_t *) kmalloc(sizeof(*mddev), GFP_KERNEL);
+       if (!mddev)
+               return NULL;
+               
+       memset(mddev, 0, sizeof(*mddev));
 
-#define NO_DEVICE KERN_ERR \
-"md: disabled device %s\n"
+       mddev->__minor = MINOR(dev);
+       mddev->reconfig_sem = MUTEX;
+       mddev->recovery_sem = MUTEX;
+       mddev->resync_sem = MUTEX;
+       MD_INIT_LIST_HEAD(&mddev->disks);
+       /*
+        * The 'base' mddev is the one with data NULL.
+        * personalities can create additional mddevs 
+        * if necessary.
+        */
+       add_mddev_mapping(mddev, dev, 0);
+       md_list_add(&mddev->all_mddevs, &all_mddevs);
 
-#define SUCCESS 0
-#define FAILURE -1
+       return mddev;
+}
 
-static int analyze_one_sb (struct real_dev * rdev)
+static void free_mddev (mddev_t *mddev)
 {
-       int ret = FAILURE;
-       struct buffer_head *bh;
-       kdev_t dev = rdev->dev;
-       md_superblock_t *sb;
+       if (!mddev) {
+               MD_BUG();
+               return;
+       }
 
        /*
-        * Read the superblock, it's at the end of the disk
+        * Make sure nobody else is using this mddev
+        * (careful, we rely on the global kernel lock here)
         */
-       rdev->sb_offset = MD_NEW_SIZE_BLOCKS (blk_size[MAJOR(dev)][MINOR(dev)]);
-       set_blocksize (dev, MD_SB_BYTES);
-       bh = bread (dev, rdev->sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
-
-       if (bh) {
-               sb = (md_superblock_t *) bh->b_data;
-               if (sb->md_magic != MD_SB_MAGIC) {
-                       printk (BAD_MAGIC, kdevname(dev),
-                                        sb->md_magic, rdev->sb_offset);
-                       goto abort;
-               }
-               rdev->sb = (md_superblock_t *) __get_free_page(GFP_KERNEL);
-               if (!rdev->sb) {
-                       printk (OUT_OF_MEM);
-                       goto abort;
-               }
-               memcpy (rdev->sb, bh->b_data, MD_SB_BYTES);
+       while (md_atomic_read(&mddev->resync_sem.count) != 1)
+               schedule();
+       while (md_atomic_read(&mddev->recovery_sem.count) != 1)
+               schedule();
 
-               rdev->size = sb->size;
-       } else
-               printk (NO_DEVICE,kdevname(rdev->dev));
-       ret = SUCCESS;
-abort:
-       if (bh)
-               brelse (bh);
-       return ret;
+       del_mddev_mapping(mddev, MKDEV(MD_MAJOR, mdidx(mddev)));
+       md_list_del(&mddev->all_mddevs);
+       MD_INIT_LIST_HEAD(&mddev->all_mddevs);
+       kfree(mddev);
 }
 
-#undef SUCCESS
-#undef FAILURE
-
-#undef BAD_MAGIC
-#undef OUT_OF_MEM
-#undef NO_DEVICE
 
-/*
- * Check a full RAID array for plausibility
- */
+struct gendisk * find_gendisk (kdev_t dev)
+{
+       struct gendisk *tmp = gendisk_head;
 
-#define INCONSISTENT KERN_ERR \
-"md: superblock inconsistency -- run ckraid\n"
+       while (tmp != NULL) {
+               if (tmp->major == MAJOR(dev))
+                       return (tmp);
+               tmp = tmp->next;
+       }
+       return (NULL);
+}
 
-#define OUT_OF_DATE KERN_ERR \
-"md: superblock update time inconsistenty -- using the most recent one\n"
+mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
+{
+       mdk_rdev_t * rdev;
+       struct md_list_head *tmp;
 
-#define OLD_VERSION KERN_ALERT \
-"md: %s: unsupported raid array version %d.%d.%d\n"
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (rdev->desc_nr == nr)
+                       return rdev;
+       }
+       return NULL;
+}
 
-#define NOT_CLEAN KERN_ERR \
-"md: %s: raid array is not clean -- run ckraid\n"
+mdk_rdev_t * find_rdev(mddev_t * mddev, kdev_t dev)
+{
+       struct md_list_head *tmp;
+       mdk_rdev_t *rdev;
 
-#define NOT_CLEAN_IGNORE KERN_ERR \
-"md: %s: raid array is not clean -- reconstructing parity\n"
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (rdev->dev == dev)
+                       return rdev;
+       }
+       return NULL;
+}
 
-#define UNKNOWN_LEVEL KERN_ERR \
-"md: %s: unsupported raid level %d\n"
+static MD_LIST_HEAD(device_names);
 
-static int analyze_sbs (int minor, int pnum)
+char * partition_name (kdev_t dev)
 {
-       struct md_dev *mddev = md_dev + minor;
-       int i, N = mddev->nb_dev, out_of_date = 0;
-       struct real_dev * disks = mddev->devices;
-       md_superblock_t *sb, *freshest = NULL;
+       struct gendisk *hd;
+       static char nomem [] = "<nomem>";
+       dev_name_t *dname;
+       struct md_list_head *tmp = device_names.next;
 
-       /*
-        * RAID-0 and linear don't use a RAID superblock
-        */
-       if (pnum == RAID0 >> PERSONALITY_SHIFT ||
-               pnum == LINEAR >> PERSONALITY_SHIFT)
-                       return legacy_raid_sb (minor, pnum);
+       while (tmp != &device_names) {
+               dname = md_list_entry(tmp, dev_name_t, list);
+               if (dname->dev == dev)
+                       return dname->name;
+               tmp = tmp->next;
+       }
+
+       dname = (dev_name_t *) kmalloc(sizeof(*dname), GFP_KERNEL);
 
+       if (!dname)
+               return nomem;
        /*
-        * Verify the RAID superblock on each real device
+        * ok, add this new device name to the list
         */
-       for (i = 0; i < N; i++)
-               if (analyze_one_sb(disks+i))
-                       goto abort;
+       hd = find_gendisk (dev);
+
+       if (!hd)
+               sprintf (dname->name, "[dev %s]", kdevname(dev));
+       else
+               disk_name (hd, MINOR(dev), dname->name);
+
+       dname->dev = dev;
+       md_list_add(&dname->list, &device_names);
+
+       return dname->name;
+}
+
+static unsigned int calc_dev_sboffset (kdev_t dev, mddev_t *mddev,
+                                               int persistent)
+{
+       unsigned int size = 0;
+
+       if (blk_size[MAJOR(dev)])
+               size = blk_size[MAJOR(dev)][MINOR(dev)];
+       if (persistent)
+               size = MD_NEW_SIZE_BLOCKS(size);
+       return size;
+}
+
+static unsigned int calc_dev_size (kdev_t dev, mddev_t *mddev, int persistent)
+{
+       unsigned int size;
+
+       size = calc_dev_sboffset(dev, mddev, persistent);
+       if (!mddev->sb) {
+               MD_BUG();
+               return size;
+       }
+       if (mddev->sb->chunk_size)
+               size &= ~(mddev->sb->chunk_size/1024 - 1);
+       return size;
+}
+
+/*
+ * We check wether all devices are numbered from 0 to nb_dev-1. The
+ * order is guaranteed even after device name changes.
+ *
+ * Some personalities (raid0, linear) use this. Personalities that
+ * provide data have to be able to deal with loss of individual
+ * disks, so they do their checking themselves.
+ */
+int md_check_ordering (mddev_t *mddev)
+{
+       int i, c;
+       mdk_rdev_t *rdev;
+       struct md_list_head *tmp;
 
        /*
-        * The superblock constant part has to be the same
-        * for all disks in the array.
+        * First, all devices must be fully functional
         */
-       sb = NULL;
-       for (i = 0; i < N; i++) {
-               if (!disks[i].sb)
-                       continue;
-               if (!sb) {
-                       sb = disks[i].sb;
-                       continue;
-               }
-               if (memcmp(sb,
-                          disks[i].sb, MD_SB_GENERIC_CONSTANT_WORDS * 4)) {
-                       printk (INCONSISTENT);
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (rdev->faulty) {
+                       printk("md: md%d's device %s faulty, aborting.\n",
+                               mdidx(mddev), partition_name(rdev->dev));
                        goto abort;
                }
        }
 
-       /*
-        * OK, we have all disks and the array is ready to run. Let's
-        * find the freshest superblock, that one will be the superblock
-        * that represents the whole array.
-        */
-       if ((sb = mddev->sb = (md_superblock_t *) __get_free_page (GFP_KERNEL)) == NULL)
+       c = 0;
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               c++;
+       }
+       if (c != mddev->nb_dev) {
+               MD_BUG();
                goto abort;
-       freshest = NULL;
-       for (i = 0; i < N; i++) {
-               if (!disks[i].sb)
-                       continue;
-               if (!freshest) {
-                       freshest = disks[i].sb;
-                       continue;
-               }
-               /*
-                * Find the newest superblock version
-                */
-               if (disks[i].sb->utime != freshest->utime) {
-                       out_of_date = 1;
-                       if (disks[i].sb->utime > freshest->utime)
-                               freshest = disks[i].sb;
-               }
        }
-       if (out_of_date)
-               printk(OUT_OF_DATE);
-       memcpy (sb, freshest, sizeof(*freshest));
-
-       /*
-        * Check if we can support this RAID array
-        */
-       if (sb->major_version != MD_MAJOR_VERSION ||
-                       sb->minor_version > MD_MINOR_VERSION) {
-
-               printk (OLD_VERSION, kdevname(MKDEV(MD_MAJOR, minor)),
-                               sb->major_version, sb->minor_version,
-                               sb->patch_version);
+       if (mddev->nb_dev != mddev->sb->raid_disks) {
+               printk("md: md%d, array needs %d disks, has %d, aborting.\n",
+                       mdidx(mddev), mddev->sb->raid_disks, mddev->nb_dev);
                goto abort;
        }
-
        /*
-        * We need to add this as a superblock option.
+        * Now the numbering check
         */
-#if SUPPORT_RECONSTRUCTION
-       if (sb->state != (1 << MD_SB_CLEAN)) {
-               if (sb->level == 1) {
-                       printk (NOT_CLEAN, kdevname(MKDEV(MD_MAJOR, minor)));
+       for (i = 0; i < mddev->nb_dev; i++) {
+               c = 0;
+               ITERATE_RDEV(mddev,rdev,tmp) {
+                       if (rdev->desc_nr == i)
+                               c++;
+               }
+               if (c == 0) {
+                       printk("md: md%d, missing disk #%d, aborting.\n",
+                               mdidx(mddev), i);
                        goto abort;
-               } else
-                       printk (NOT_CLEAN_IGNORE, kdevname(MKDEV(MD_MAJOR, minor)));
-       }
-#else
-       if (sb->state != (1 << MD_SB_CLEAN)) {
-               printk (NOT_CLEAN, kdevname(MKDEV(MD_MAJOR, minor)));
-               goto abort;
-       }
-#endif /* SUPPORT_RECONSTRUCTION */
-
-       switch (sb->level) {
-               case 1:
-                       md_size[minor] = sb->size;
-                       md_maxreadahead[minor] = MD_DEFAULT_DISK_READAHEAD;
-                       break;
-               case 4:
-               case 5:
-                       md_size[minor] = sb->size * (sb->raid_disks - 1);
-                       md_maxreadahead[minor] = MD_DEFAULT_DISK_READAHEAD * (sb->raid_disks - 1);
-                       break;
-               default:
-                       printk (UNKNOWN_LEVEL, kdevname(MKDEV(MD_MAJOR, minor)),
-                                       sb->level);
+               }
+               if (c > 1) {
+                       printk("md: md%d, too many disks #%d, aborting.\n",
+                               mdidx(mddev), i);
                        goto abort;
+               }
        }
        return 0;
 abort:
-       free_sb(mddev);
        return 1;
 }
 
-#undef INCONSISTENT
-#undef OUT_OF_DATE
-#undef OLD_VERSION
-#undef NOT_CLEAN
-#undef OLD_LEVEL
-
-int md_update_sb(int minor)
+static unsigned int zoned_raid_size (mddev_t *mddev)
 {
-       struct md_dev *mddev = md_dev + minor;
-       struct buffer_head *bh;
-       md_superblock_t *sb = mddev->sb;
-       struct real_dev *realdev;
-       kdev_t dev;
-       int i;
-       u32 sb_offset;
+       unsigned int mask;
+       mdk_rdev_t * rdev;
+       struct md_list_head *tmp;
 
-       sb->utime = CURRENT_TIME;
-       for (i = 0; i < mddev->nb_dev; i++) {
-               realdev = mddev->devices + i;
-               if (!realdev->sb)
-                       continue;
-               dev = realdev->dev;
-               sb_offset = realdev->sb_offset;
-               set_blocksize(dev, MD_SB_BYTES);
-               printk("md: updating raid superblock on device %s, sb_offset == %u\n", kdevname(dev), sb_offset);
-               bh = getblk(dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
-               if (bh) {
-                       sb = (md_superblock_t *) bh->b_data;
-                       memcpy(sb, mddev->sb, MD_SB_BYTES);
-                       memcpy(&sb->descriptor, sb->disks + realdev->sb->descriptor.number, MD_SB_DESCRIPTOR_WORDS * 4);
-                       mark_buffer_uptodate(bh, 1);
-                       mark_buffer_dirty(bh, 1);
-                       ll_rw_block(WRITE, 1, &bh);
-                       wait_on_buffer(bh);
-                       bforget(bh);
-                       fsync_dev(dev);
-                       invalidate_buffers(dev);
-               } else
-                       printk(KERN_ERR "md: getblk failed for device %s\n", kdevname(dev));
+       if (!mddev->sb) {
+               MD_BUG();
+               return -EINVAL;
+       }
+       /*
+        * do size and offset calculations.
+        */
+       mask = ~(mddev->sb->chunk_size/1024 - 1);
+printk("mask %08x\n", mask);
+
+       ITERATE_RDEV(mddev,rdev,tmp) {
+printk(" rdev->size: %d\n", rdev->size);
+               rdev->size &= mask;
+printk(" masked rdev->size: %d\n", rdev->size);
+               md_size[mdidx(mddev)] += rdev->size;
+printk("  new md_size: %d\n", md_size[mdidx(mddev)]);
        }
        return 0;
 }
 
-static int do_md_run (int minor, int repart)
+static void remove_descriptor (mdp_disk_t *disk, mdp_super_t *sb)
 {
-  int pnum, i, min, factor, err;
+       if (disk_active(disk)) {
+               sb->working_disks--;
+       } else {
+               if (disk_spare(disk)) {
+                       sb->spare_disks--;
+                       sb->working_disks--;
+               } else  {
+                       sb->failed_disks--;
+               }
+       }
+       sb->nr_disks--;
+       disk->major = 0;
+       disk->minor = 0;
+       mark_disk_removed(disk);
+}
 
-  if (!md_dev[minor].nb_dev)
-    return -EINVAL;
-  
-  if (md_dev[minor].pers)
-    return -EBUSY;
+#define BAD_MAGIC KERN_ERR \
+"md: invalid raid superblock magic on %s\n"
 
-  md_dev[minor].repartition=repart;
-  
-  if ((pnum=PERSONALITY(&md_dev[minor]) >> (PERSONALITY_SHIFT))
-      >= MAX_PERSONALITY)
-    return -EINVAL;
-
-  /* Only RAID-1 and RAID-5 can have MD devices as underlying devices */
-  if (pnum != (RAID1 >> PERSONALITY_SHIFT) && pnum != (RAID5 >> PERSONALITY_SHIFT)){
-         for (i = 0; i < md_dev [minor].nb_dev; i++)
-                 if (MAJOR (md_dev [minor].devices [i].dev) == MD_MAJOR)
-                         return -EINVAL;
-  }
-  if (!pers[pnum])
-  {
-#ifdef CONFIG_KMOD
-    char module_name[80];
-    sprintf (module_name, "md-personality-%d", pnum);
-    request_module (module_name);
-    if (!pers[pnum])
-#endif
-      return -EINVAL;
-  }
-  
-  factor = min = 1 << FACTOR_SHIFT(FACTOR((md_dev+minor)));
-  
-  for (i=0; i<md_dev[minor].nb_dev; i++)
-    if (md_dev[minor].devices[i].size<min)
-    {
-      printk ("Dev %s smaller than %dk, cannot shrink\n",
-             partition_name (md_dev[minor].devices[i].dev), min);
-      return -EINVAL;
-    }
-
-  for (i=0; i<md_dev[minor].nb_dev; i++) {
-    fsync_dev(md_dev[minor].devices[i].dev);
-    invalidate_buffers(md_dev[minor].devices[i].dev);
-  }
-  
-  /* Resize devices according to the factor. It is used to align
-     partitions size on a given chunk size. */
-  md_size[minor]=0;
-
-  /*
-   * Analyze the raid superblock
-   */ 
-  if (analyze_sbs(minor, pnum))
-    return -EINVAL;
+#define BAD_MINOR KERN_ERR \
+"md: %s: invalid raid minor (%x)\n"
 
-  md_dev[minor].pers=pers[pnum];
-  
-  if ((err=md_dev[minor].pers->run (minor, md_dev+minor)))
-  {
-    md_dev[minor].pers=NULL;
-    free_sb(md_dev + minor);
-    return (err);
-  }
-
-  if (pnum != RAID0 >> PERSONALITY_SHIFT && pnum != LINEAR >> PERSONALITY_SHIFT)
-  {
-    md_dev[minor].sb->state &= ~(1 << MD_SB_CLEAN);
-    md_update_sb(minor);
-  }
-
-  /* FIXME : We assume here we have blocks
-     that are twice as large as sectors.
-     THIS MAY NOT BE TRUE !!! */
-  md_hd_struct[minor].start_sect=0;
-  md_hd_struct[minor].nr_sects=md_size[minor]<<1;
-  
-  read_ahead[MD_MAJOR] = 128;
-  return (0);
-}
+#define OUT_OF_MEM KERN_ALERT \
+"md: out of memory.\n"
+
+#define NO_SB KERN_ERR \
+"md: disabled device %s, could not read superblock.\n"
 
-static int do_md_stop (int minor, struct inode *inode)
+#define BAD_CSUM KERN_WARNING \
+"md: invalid superblock checksum on %s\n"
+
+static int alloc_array_sb (mddev_t * mddev)
 {
-       int i;
-  
-       if (inode->i_count>1 || md_dev[minor].busy>1) {
-               /*
-                * ioctl : one open channel
-                */
-               printk ("STOP_MD md%x failed : i_count=%d, busy=%d\n",
-                               minor, inode->i_count, md_dev[minor].busy);
-               return -EBUSY;
-       }
-  
-       if (md_dev[minor].pers) {
-               /*
-                * It is safe to call stop here, it only frees private
-                * data. Also, it tells us if a device is unstoppable
-                * (eg. resyncing is in progress)
-                */
-               if (md_dev[minor].pers->stop (minor, md_dev+minor))
-                       return -EBUSY;
-               /*
-                *  The device won't exist anymore -> flush it now
-                */
-               fsync_dev (inode->i_rdev);
-               invalidate_buffers (inode->i_rdev);
-               if (md_dev[minor].sb) {
-                       md_dev[minor].sb->state |= 1 << MD_SB_CLEAN;
-                       md_update_sb(minor);
-               }
+       if (mddev->sb) {
+               MD_BUG();
+               return 0;
        }
-  
-       /* Remove locks. */
-       if (md_dev[minor].sb)
-       free_sb(md_dev + minor);
-       for (i=0; i<md_dev[minor].nb_dev; i++)
-               clear_inode (md_dev[minor].devices[i].inode);
-
-       md_dev[minor].nb_dev=md_size[minor]=0;
-       md_hd_struct[minor].nr_sects=0;
-       md_dev[minor].pers=NULL;
-  
-       read_ahead[MD_MAJOR] = 128;
-  
-       return (0);
+
+       mddev->sb = (mdp_super_t *) __get_free_page (GFP_KERNEL);
+       if (!mddev->sb)
+               return -ENOMEM;
+       md_clear_page((unsigned long)mddev->sb);
+       return 0;
 }
 
-static int do_md_add (int minor, kdev_t dev)
+static int alloc_disk_sb (mdk_rdev_t * rdev)
 {
-       int i;
-       int hot_add=0;
-       struct real_dev *realdev;
+       if (rdev->sb)
+               MD_BUG();
 
-       if (md_dev[minor].nb_dev==MAX_REAL)
+       rdev->sb = (mdp_super_t *) __get_free_page(GFP_KERNEL);
+       if (!rdev->sb) {
+               printk (OUT_OF_MEM);
                return -EINVAL;
+       }
+       md_clear_page((unsigned long)rdev->sb);
 
-       if (!fs_may_mount (dev))
-               return -EBUSY;
+       return 0;
+}
 
-       if (blk_size[MAJOR(dev)] == NULL || blk_size[MAJOR(dev)][MINOR(dev)] == 0) {
-               printk("md_add(): zero device size, huh, bailing out.\n");
-               return -EINVAL;
+static void free_disk_sb (mdk_rdev_t * rdev)
+{
+       if (rdev->sb) {
+               free_page((unsigned long) rdev->sb);
+               rdev->sb = NULL;
+               rdev->sb_offset = 0;
+               rdev->size = 0;
+       } else {
+               if (!rdev->faulty)
+                       MD_BUG();
        }
+}
 
-       if (md_dev[minor].pers) {
-               /*
-                * The array is already running, hot-add the drive, or
-                * bail out:
-                */
-               if (!md_dev[minor].pers->hot_add_disk)
-                       return -EBUSY;
-               else
-                       hot_add=1;
+static void mark_rdev_faulty (mdk_rdev_t * rdev)
+{
+       unsigned long flags;
+
+       if (!rdev) {
+               MD_BUG();
+               return;
        }
+       save_flags(flags);
+       cli();
+       free_disk_sb(rdev);
+       rdev->faulty = 1;
+       restore_flags(flags);
+}
+
+static int read_disk_sb (mdk_rdev_t * rdev)
+{
+       int ret = -EINVAL;
+       struct buffer_head *bh = NULL;
+       kdev_t dev = rdev->dev;
+       mdp_super_t *sb;
+       u32 sb_offset;
 
+       if (!rdev->sb) {
+               MD_BUG();
+               goto abort;
+       }       
+       
        /*
-        * Careful. We cannot increase nb_dev for a running array.
+        * Calculate the position of the superblock,
+        * it's at the end of the disk
         */
-       i=md_dev[minor].nb_dev;
-       realdev = &md_dev[minor].devices[i];
-       realdev->dev=dev;
-  
-       /* Lock the device by inserting a dummy inode. This doesn't
-          smell very good, but I need to be consistent with the
-          mount stuff, specially with fs_may_mount. If someone have
-          a better idea, please help ! */
-  
-       realdev->inode=get_empty_inode ();
-       realdev->inode->i_dev=dev;      /* don't care about other fields */
-       insert_inode_hash (realdev->inode);
-  
-       /* Sizes are now rounded at run time */
-  
-/*  md_dev[minor].devices[i].size=gen_real->sizes[MINOR(dev)]; HACKHACK*/
-
-       realdev->size=blk_size[MAJOR(dev)][MINOR(dev)];
+       sb_offset = calc_dev_sboffset(rdev->dev, rdev->mddev, 1);
+       rdev->sb_offset = sb_offset;
+       printk("(read) %s's sb offset: %d", partition_name(dev),
+                                                        sb_offset);
+       fsync_dev(dev);
+       set_blocksize (dev, MD_SB_BYTES);
+       bh = bread (dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
 
-       if (hot_add) {
+       if (bh) {
+               sb = (mdp_super_t *) bh->b_data;
+               memcpy (rdev->sb, sb, MD_SB_BYTES);
+       } else {
+               printk (NO_SB,partition_name(rdev->dev));
+               goto abort;
+       }
+       printk(" [events: %08lx]\n", (unsigned long)get_unaligned(&rdev->sb->events));
+       ret = 0;
+abort:
+       if (bh)
+               brelse (bh);
+       return ret;
+}
+
+static unsigned int calc_sb_csum (mdp_super_t * sb)
+{
+       unsigned int disk_csum, csum;
+
+       disk_csum = sb->sb_csum;
+       sb->sb_csum = 0;
+       csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
+       sb->sb_csum = disk_csum;
+       return csum;
+}
+
+/*
+ * Check one RAID superblock for generic plausibility
+ */
+
+static int check_disk_sb (mdk_rdev_t * rdev)
+{
+       mdp_super_t *sb;
+       int ret = -EINVAL;
+
+       sb = rdev->sb;
+       if (!sb) {
+               MD_BUG();
+               goto abort;
+       }
+
+       if (sb->md_magic != MD_SB_MAGIC) {
+               printk (BAD_MAGIC, partition_name(rdev->dev));
+               goto abort;
+       }
+
+       if (sb->md_minor >= MAX_MD_DEVS) {
+               printk (BAD_MINOR, partition_name(rdev->dev),
+                                                       sb->md_minor);
+               goto abort;
+       }
+
+       if (calc_sb_csum(sb) != sb->sb_csum)
+               printk(BAD_CSUM, partition_name(rdev->dev));
+       ret = 0;
+abort:
+       return ret;
+}
+
+static kdev_t dev_unit(kdev_t dev)
+{
+       unsigned int mask;
+       struct gendisk *hd = find_gendisk(dev);
+
+       if (!hd)
+               return 0;
+       mask = ~((1 << hd->minor_shift) - 1);
+
+       return MKDEV(MAJOR(dev), MINOR(dev) & mask);
+}
+
+static mdk_rdev_t * match_dev_unit(mddev_t *mddev, kdev_t dev)
+{
+       struct md_list_head *tmp;
+       mdk_rdev_t *rdev;
+
+       ITERATE_RDEV(mddev,rdev,tmp)
+               if (dev_unit(rdev->dev) == dev_unit(dev))
+                       return rdev;
+
+       return NULL;
+}
+
+static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
+{
+       struct md_list_head *tmp;
+       mdk_rdev_t *rdev;
+
+       ITERATE_RDEV(mddev1,rdev,tmp)
+               if (match_dev_unit(mddev2, rdev->dev))
+                       return 1;
+
+       return 0;
+}
+
+static MD_LIST_HEAD(all_raid_disks);
+static MD_LIST_HEAD(pending_raid_disks);
+
+static void bind_rdev_to_array (mdk_rdev_t * rdev, mddev_t * mddev)
+{
+       mdk_rdev_t *same_pdev;
+
+       if (rdev->mddev) {
+               MD_BUG();
+               return;
+       }
+       same_pdev = match_dev_unit(mddev, rdev->dev);
+       if (same_pdev)
+               printk( KERN_WARNING
+"md%d: WARNING: %s appears to be on the same physical disk as %s. True\n"
+"     protection against single-disk failure might be compromised.\n",
+                       mdidx(mddev), partition_name(rdev->dev),
+                               partition_name(same_pdev->dev));
+               
+       md_list_add(&rdev->same_set, &mddev->disks);
+       rdev->mddev = mddev;
+       mddev->nb_dev++;
+       printk("bind<%s,%d>\n", partition_name(rdev->dev), mddev->nb_dev);
+}
+
+static void unbind_rdev_from_array (mdk_rdev_t * rdev)
+{
+       if (!rdev->mddev) {
+               MD_BUG();
+               return;
+       }
+       md_list_del(&rdev->same_set);
+       MD_INIT_LIST_HEAD(&rdev->same_set);
+       rdev->mddev->nb_dev--;
+       printk("unbind<%s,%d>\n", partition_name(rdev->dev),
+                                                rdev->mddev->nb_dev);
+       rdev->mddev = NULL;
+}
+
+/*
+ * prevent the device from being mounted, repartitioned or
+ * otherwise reused by a RAID array (or any other kernel
+ * subsystem), by opening the device. [simply getting an
+ * inode is not enough, the SCSI module usage code needs
+ * an explicit open() on the device]
+ */
+static int lock_rdev (mdk_rdev_t *rdev)
+{
+       int err = 0;
+
+       /*
+        * First insert a dummy inode.
+        */
+       if (rdev->inode)
+               MD_BUG();
+       rdev->inode = get_empty_inode();
+       /*
+        * we dont care about any other fields
+        */
+       rdev->inode->i_dev = rdev->inode->i_rdev = rdev->dev;
+       insert_inode_hash(rdev->inode);
+
+       memset(&rdev->filp, 0, sizeof(rdev->filp));
+       rdev->filp.f_mode = 3; /* read write */
+       err = blkdev_open(rdev->inode, &rdev->filp);
+       if (err) {
+               printk("blkdev_open() failed: %d\n", err);
+               clear_inode(rdev->inode);
+               rdev->inode = NULL;
+       }
+       return err;
+}
+
+static void unlock_rdev (mdk_rdev_t *rdev)
+{
+       blkdev_release(rdev->inode);
+       if (!rdev->inode)
+               MD_BUG();
+       clear_inode(rdev->inode);
+       rdev->inode = NULL;
+}
+
+static void export_rdev (mdk_rdev_t * rdev)
+{
+       printk("export_rdev(%s)\n",partition_name(rdev->dev));
+       if (rdev->mddev)
+               MD_BUG();
+       unlock_rdev(rdev);
+       free_disk_sb(rdev);
+       md_list_del(&rdev->all);
+       MD_INIT_LIST_HEAD(&rdev->all);
+       if (rdev->pending.next != &rdev->pending) {
+               printk("(%s was pending)\n",partition_name(rdev->dev));
+               md_list_del(&rdev->pending);
+               MD_INIT_LIST_HEAD(&rdev->pending);
+       }
+       rdev->dev = 0;
+       rdev->faulty = 0;
+       kfree(rdev);
+}
+
+static void kick_rdev_from_array (mdk_rdev_t * rdev)
+{
+       unbind_rdev_from_array(rdev);
+       export_rdev(rdev);
+}
+
+static void export_array (mddev_t *mddev)
+{
+       struct md_list_head *tmp;
+       mdk_rdev_t *rdev;
+       mdp_super_t *sb = mddev->sb;
+
+       if (mddev->sb) {
+               mddev->sb = NULL;
+               free_page((unsigned long) sb);
+       }
+
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (!rdev->mddev) {
+                       MD_BUG();
+                       continue;
+               }
+               kick_rdev_from_array(rdev);
+       }
+       if (mddev->nb_dev)
+               MD_BUG();
+}
+
+#undef BAD_CSUM
+#undef BAD_MAGIC
+#undef OUT_OF_MEM
+#undef NO_SB
+
+static void print_desc(mdp_disk_t *desc)
+{
+       printk(" DISK<N:%d,%s(%d,%d),R:%d,S:%d>\n", desc->number,
+               partition_name(MKDEV(desc->major,desc->minor)),
+               desc->major,desc->minor,desc->raid_disk,desc->state);
+}
+
+static void print_sb(mdp_super_t *sb)
+{
+       int i;
+
+       printk("  SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
+               sb->major_version, sb->minor_version, sb->patch_version,
+               sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
+               sb->ctime);
+       printk("     L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", sb->level,
+               sb->size, sb->nr_disks, sb->raid_disks, sb->md_minor,
+               sb->layout, sb->chunk_size);
+       printk("     UT:%08x ST:%d AD:%d WD:%d FD:%d SD:%d CSUM:%08x E:%08lx\n",
+               sb->utime, sb->state, sb->active_disks, sb->working_disks,
+               sb->failed_disks, sb->spare_disks,
+               sb->sb_csum, (unsigned long)get_unaligned(&sb->events));
+
+       for (i = 0; i < MD_SB_DISKS; i++) {
+               mdp_disk_t *desc;
+
+               desc = sb->disks + i;
+               printk("     D %2d: ", i);
+               print_desc(desc);
+       }
+       printk("     THIS: ");
+       print_desc(&sb->this_disk);
+
+}
+
+static void print_rdev(mdk_rdev_t *rdev)
+{
+       printk(" rdev %s: O:%s, SZ:%08d F:%d DN:%d ",
+               partition_name(rdev->dev), partition_name(rdev->old_dev),
+               rdev->size, rdev->faulty, rdev->desc_nr);
+       if (rdev->sb) {
+               printk("rdev superblock:\n");
+               print_sb(rdev->sb);
+       } else
+               printk("no rdev superblock!\n");
+}
+
+void md_print_devices (void)
+{
+       struct md_list_head *tmp, *tmp2;
+       mdk_rdev_t *rdev;
+       mddev_t *mddev;
+
+       printk("\n");
+       printk("       **********************************\n");
+       printk("       * <COMPLETE RAID STATE PRINTOUT> *\n");
+       printk("       **********************************\n");
+       ITERATE_MDDEV(mddev,tmp) {
+               printk("md%d: ", mdidx(mddev));
+
+               ITERATE_RDEV(mddev,rdev,tmp2)
+                       printk("<%s>", partition_name(rdev->dev));
+
+               if (mddev->sb) {
+                       printk(" array superblock:\n");
+                       print_sb(mddev->sb);
+               } else
+                       printk(" no array superblock.\n");
+
+               ITERATE_RDEV(mddev,rdev,tmp2)
+                       print_rdev(rdev);
+       }
+       printk("       **********************************\n");
+       printk("\n");
+}
+
+static int sb_equal ( mdp_super_t *sb1, mdp_super_t *sb2)
+{
+       int ret;
+       mdp_super_t *tmp1, *tmp2;
+
+       tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
+       tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
+
+       if (!tmp1 || !tmp2) {
+               ret = 0;
+               goto abort;
+       }
+
+       *tmp1 = *sb1;
+       *tmp2 = *sb2;
+
+       /*
+        * nr_disks is not constant
+        */
+       tmp1->nr_disks = 0;
+       tmp2->nr_disks = 0;
+
+       if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
+               ret = 0;
+       else
+               ret = 1;
+
+abort:
+       if (tmp1)
+               kfree(tmp1);
+       if (tmp2)
+               kfree(tmp2);
+
+       return ret;
+}
+
+static int uuid_equal(mdk_rdev_t *rdev1, mdk_rdev_t *rdev2)
+{
+       if (    (rdev1->sb->set_uuid0 == rdev2->sb->set_uuid0) &&
+               (rdev1->sb->set_uuid1 == rdev2->sb->set_uuid1) &&
+               (rdev1->sb->set_uuid2 == rdev2->sb->set_uuid2) &&
+               (rdev1->sb->set_uuid3 == rdev2->sb->set_uuid3))
+
+               return 1;
+
+       return 0;
+}
+
+static mdk_rdev_t * find_rdev_all (kdev_t dev)
+{
+       struct md_list_head *tmp;
+       mdk_rdev_t *rdev;
+
+       tmp = all_raid_disks.next;
+       while (tmp != &all_raid_disks) {
+               rdev = md_list_entry(tmp, mdk_rdev_t, all);
+               if (rdev->dev == dev)
+                       return rdev;
+               tmp = tmp->next;
+       }
+       return NULL;
+}
+
+#define GETBLK_FAILED KERN_ERR \
+"md: getblk failed for device %s\n"
+
+static int write_disk_sb(mdk_rdev_t * rdev)
+{
+       struct buffer_head *bh;
+       kdev_t dev;
+       u32 sb_offset, size;
+       mdp_super_t *sb;
+
+       if (!rdev->sb) {
+               MD_BUG();
+               return -1;
+       }
+       if (rdev->faulty) {
+               MD_BUG();
+               return -1;
+       }
+       if (rdev->sb->md_magic != MD_SB_MAGIC) {
+               MD_BUG();
+               return -1;
+       }
+
+       dev = rdev->dev;
+       sb_offset = calc_dev_sboffset(dev, rdev->mddev, 1);
+       if (rdev->sb_offset != sb_offset) {
+               printk("%s's sb offset has changed from %d to %d, skipping\n", partition_name(dev), rdev->sb_offset, sb_offset);
+               goto skip;
+       }
+       /*
+        * If the disk went offline meanwhile and it's just a spare, then
+        * it's size has changed to zero silently, and the MD code does
+        * not yet know that it's faulty.
+        */
+       size = calc_dev_size(dev, rdev->mddev, 1);
+       if (size != rdev->size) {
+               printk("%s's size has changed from %d to %d since import, skipping\n", partition_name(dev), rdev->size, size);
+               goto skip;
+       }
+
+       printk("(write) %s's sb offset: %d\n", partition_name(dev), sb_offset);
+       fsync_dev(dev);
+       set_blocksize(dev, MD_SB_BYTES);
+       bh = getblk(dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
+       if (!bh) {
+               printk(GETBLK_FAILED, partition_name(dev));
+               return 1;
+       }
+       memset(bh->b_data,0,bh->b_size);
+       sb = (mdp_super_t *) bh->b_data;
+       memcpy(sb, rdev->sb, MD_SB_BYTES);
+
+       mark_buffer_uptodate(bh, 1);
+       mark_buffer_dirty(bh, 1);
+       ll_rw_block(WRITE, 1, &bh);
+       wait_on_buffer(bh);
+       brelse(bh);
+       fsync_dev(dev);
+skip:
+       return 0;
+}
+#undef GETBLK_FAILED KERN_ERR
+
+static void set_this_disk(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+       int i, ok = 0;
+       mdp_disk_t *desc;
+
+       for (i = 0; i < MD_SB_DISKS; i++) {
+               desc = mddev->sb->disks + i;
+#if 0
+               if (disk_faulty(desc)) {
+                       if (MKDEV(desc->major,desc->minor) == rdev->dev)
+                               ok = 1;
+                       continue;
+               }
+#endif
+               if (MKDEV(desc->major,desc->minor) == rdev->dev) {
+                       rdev->sb->this_disk = *desc;
+                       rdev->desc_nr = desc->number;
+                       ok = 1;
+                       break;
+               }
+       }
+
+       if (!ok) {
+               MD_BUG();
+       }
+}
+
+static int sync_sbs(mddev_t * mddev)
+{
+       mdk_rdev_t *rdev;
+       mdp_super_t *sb;
+        struct md_list_head *tmp;
+
+        ITERATE_RDEV(mddev,rdev,tmp) {
+               if (rdev->faulty)
+                       continue;
+               sb = rdev->sb;
+               *sb = *mddev->sb;
+               set_this_disk(mddev, rdev);
+               sb->sb_csum = calc_sb_csum(sb);
+       }
+       return 0;
+}
+
+int md_update_sb(mddev_t * mddev)
+{
+       int first, err, count = 100;
+        struct md_list_head *tmp;
+       mdk_rdev_t *rdev;
+       __u64 ev;
+
+repeat:
+       mddev->sb->utime = CURRENT_TIME;
+       ev = get_unaligned(&mddev->sb->events);
+       ++ev;
+       put_unaligned(ev,&mddev->sb->events);
+       if (ev == (__u64)0) {
+               /*
+                * oops, this 64-bit counter should never wrap.
+                * Either we are in around ~1 trillion A.C., assuming
+                * 1 reboot per second, or we have a bug:
+                */
+               MD_BUG();
+               --ev;
+               put_unaligned(ev,&mddev->sb->events);
+       }
+       sync_sbs(mddev);
+
+       /*
+        * do not write anything to disk if using
+        * nonpersistent superblocks
+        */
+       if (mddev->sb->not_persistent)
+               return 0;
+
+       printk(KERN_INFO "md: updating md%d RAID superblock on device\n",
+                                       mdidx(mddev));
+
+       first = 1;
+       err = 0;
+        ITERATE_RDEV(mddev,rdev,tmp) {
+               if (!first) {
+                       first = 0;
+                       printk(", ");
+               }
+               if (rdev->faulty)
+                       printk("(skipping faulty ");
+               printk("%s ", partition_name(rdev->dev));
+               if (!rdev->faulty) {
+                       printk("[events: %08lx]",
+                              (unsigned long)get_unaligned(&rdev->sb->events));
+                       err += write_disk_sb(rdev);
+               } else
+                       printk(")\n");
+       }
+       printk(".\n");
+       if (err) {
+               printk("errors occured during superblock update, repeating\n");
+               if (--count)
+                       goto repeat;
+               printk("excessive errors occured during superblock update, exiting\n");
+       }
+       return 0;
+}
+
+/*
+ * Import a device. If 'on_disk', then sanity check the superblock
+ *
+ * mark the device faulty if:
+ *
+ *   - the device is nonexistent (zero size)
+ *   - the device has no valid superblock
+ *
+ * a faulty rdev _never_ has rdev->sb set.
+ */
+static int md_import_device (kdev_t newdev, int on_disk)
+{
+       int err;
+       mdk_rdev_t *rdev;
+       unsigned int size;
+
+       if (find_rdev_all(newdev))
+               return -EEXIST;
+
+       rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL);
+       if (!rdev) {
+               printk("could not alloc mem for %s!\n", partition_name(newdev));
+               return -ENOMEM;
+       }
+       memset(rdev, 0, sizeof(*rdev));
+
+       if (!fs_may_mount(newdev)) {
+               printk("md: can not import %s, has active inodes!\n",
+                       partition_name(newdev));
+               err = -EBUSY;
+               goto abort_free;
+       }
+
+       if ((err = alloc_disk_sb(rdev)))
+               goto abort_free;
+
+       rdev->dev = newdev;
+       if (lock_rdev(rdev)) {
+               printk("md: could not lock %s, zero-size? Marking faulty.\n",
+                       partition_name(newdev));
+               err = -EINVAL;
+               goto abort_free;
+       }
+       rdev->desc_nr = -1;
+       rdev->faulty = 0;
+
+       size = 0;
+       if (blk_size[MAJOR(newdev)])
+               size = blk_size[MAJOR(newdev)][MINOR(newdev)];
+       if (!size) {
+               printk("md: %s has zero size, marking faulty!\n",
+                               partition_name(newdev));
+               err = -EINVAL;
+               goto abort_free;
+       }
+
+       if (on_disk) {
+               if ((err = read_disk_sb(rdev))) {
+                       printk("md: could not read %s's sb, not importing!\n",
+                                       partition_name(newdev));
+                       goto abort_free;
+               }
+               if ((err = check_disk_sb(rdev))) {
+                       printk("md: %s has invalid sb, not importing!\n",
+                                       partition_name(newdev));
+                       goto abort_free;
+               }
+
+               rdev->old_dev = MKDEV(rdev->sb->this_disk.major,
+                                       rdev->sb->this_disk.minor);
+               rdev->desc_nr = rdev->sb->this_disk.number;
+       }
+       md_list_add(&rdev->all, &all_raid_disks);
+       MD_INIT_LIST_HEAD(&rdev->pending);
+
+       if (rdev->faulty && rdev->sb)
+               free_disk_sb(rdev);
+       return 0;
+
+abort_free:
+       if (rdev->sb) {
+               if (rdev->inode)
+                       unlock_rdev(rdev);
+               free_disk_sb(rdev);
+       }
+       kfree(rdev);
+       return err;
+}
+
+/*
+ * Check a full RAID array for plausibility
+ */
+
+#define INCONSISTENT KERN_ERR \
+"md: fatal superblock inconsistency in %s -- removing from array\n"
+
+#define OUT_OF_DATE KERN_ERR \
+"md: superblock update time inconsistency -- using the most recent one\n"
+
+#define OLD_VERSION KERN_ALERT \
+"md: md%d: unsupported raid array version %d.%d.%d\n"
+
+#define NOT_CLEAN_IGNORE KERN_ERR \
+"md: md%d: raid array is not clean -- starting background reconstruction\n"
+
+#define UNKNOWN_LEVEL KERN_ERR \
+"md: md%d: unsupported raid level %d\n"
+
+static int analyze_sbs (mddev_t * mddev)
+{
+       int out_of_date = 0, i;
+       struct md_list_head *tmp, *tmp2;
+       mdk_rdev_t *rdev, *rdev2, *freshest;
+       mdp_super_t *sb;
+
+       /*
+        * Verify the RAID superblock on each real device
+        */
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (rdev->faulty) {
+                       MD_BUG();
+                       goto abort;
+               }
+               if (!rdev->sb) {
+                       MD_BUG();
+                       goto abort;
+               }
+               if (check_disk_sb(rdev))
+                       goto abort;
+       }
+
+       /*
+        * The superblock constant part has to be the same
+        * for all disks in the array.
+        */
+       sb = NULL;
+
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (!sb) {
+                       sb = rdev->sb;
+                       continue;
+               }
+               if (!sb_equal(sb, rdev->sb)) {
+                       printk (INCONSISTENT, partition_name(rdev->dev));
+                       kick_rdev_from_array(rdev);
+                       continue;
+               }
+       }
+
+       /*
+        * OK, we have all disks and the array is ready to run. Let's
+        * find the freshest superblock, that one will be the superblock
+        * that represents the whole array.
+        */
+       if (!mddev->sb)
+               if (alloc_array_sb(mddev))
+                       goto abort;
+       sb = mddev->sb;
+       freshest = NULL;
+
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               __u64 ev1, ev2;
+               /*
+                * if the checksum is invalid, use the superblock
+                * only as a last resort. (decrease it's age by
+                * one event)
+                */
+               if (calc_sb_csum(rdev->sb) != rdev->sb->sb_csum) {
+                       __u64 ev = get_unaligned(&rdev->sb->events);
+                       if (ev != (__u64)0) {
+                               --ev;
+                               put_unaligned(ev,&rdev->sb->events);
+                       }
+               }
+
+               printk("%s's event counter: %08lx\n", partition_name(rdev->dev),
+                      (unsigned long)get_unaligned(&rdev->sb->events));
+               if (!freshest) {
+                       freshest = rdev;
+                       continue;
+               }
+               /*
+                * Find the newest superblock version
+                */
+               ev1 = get_unaligned(&rdev->sb->events);
+               ev2 = get_unaligned(&freshest->sb->events);
+               if (ev1 != ev2) {
+                       out_of_date = 1;
+                       if (ev1 > ev2)
+                               freshest = rdev;
+               }
+       }
+       if (out_of_date) {
+               printk(OUT_OF_DATE);
+               printk("freshest: %s\n", partition_name(freshest->dev));
+       }
+       memcpy (sb, freshest->sb, sizeof(*sb));
+
+       /*
+        * at this point we have picked the 'best' superblock
+        * from all available superblocks.
+        * now we validate this superblock and kick out possibly
+        * failed disks.
+        */
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               /*
+                * Kick all non-fresh devices faulty
+                */
+               __u64 ev1, ev2;
+               ev1 = get_unaligned(&rdev->sb->events);
+               ev2 = get_unaligned(&sb->events);
+               ++ev1;
+               if (ev1 < ev2) {
+                       printk("md: kicking non-fresh %s from array!\n",
+                                               partition_name(rdev->dev));
+                       kick_rdev_from_array(rdev);
+                       continue;
+               }
+       }
+
+       /*
+        * Fix up changed device names ... but only if this disk has a
+        * recent update time. Use faulty checksum ones too.
+        */
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               __u64 ev1, ev2, ev3;
+               if (rdev->faulty) { /* REMOVEME */
+                       MD_BUG();
+                       goto abort;
+               }
+               ev1 = get_unaligned(&rdev->sb->events);
+               ev2 = get_unaligned(&sb->events);
+               ev3 = ev2;
+               --ev3;
+               if ((rdev->dev != rdev->old_dev) &&
+                   ((ev1 == ev2) || (ev1 == ev3))) {
+                       mdp_disk_t *desc;
+
+                       printk("md: device name has changed from %s to %s since last import!\n", partition_name(rdev->old_dev), partition_name(rdev->dev));
+                       if (rdev->desc_nr == -1) {
+                               MD_BUG();
+                               goto abort;
+                       }
+                       desc = &sb->disks[rdev->desc_nr];
+                       if (rdev->old_dev != MKDEV(desc->major, desc->minor)) {
+                               MD_BUG();
+                               goto abort;
+                       }
+                       desc->major = MAJOR(rdev->dev);
+                       desc->minor = MINOR(rdev->dev);
+                       desc = &rdev->sb->this_disk;
+                       desc->major = MAJOR(rdev->dev);
+                       desc->minor = MINOR(rdev->dev);
+               }
+       }
+
+       /*
+        * Remove unavailable and faulty devices ...
+        *
+        * note that if an array becomes completely unrunnable due to
+        * missing devices, we do not write the superblock back, so the
+        * administrator has a chance to fix things up. The removal thus
+        * only happens if it's nonfatal to the contents of the array.
+        */
+       for (i = 0; i < MD_SB_DISKS; i++) {
+               int found;
+               mdp_disk_t *desc;
+               kdev_t dev;
+
+               desc = sb->disks + i;
+               dev = MKDEV(desc->major, desc->minor);
+
+               /*
+                * We kick faulty devices/descriptors immediately.
+                */
+               if (disk_faulty(desc)) {
+                       found = 0;
+                       ITERATE_RDEV(mddev,rdev,tmp) {
+                               if (rdev->desc_nr != desc->number)
+                                       continue;
+                               printk("md%d: kicking faulty %s!\n",
+                                       mdidx(mddev),partition_name(rdev->dev));
+                               kick_rdev_from_array(rdev);
+                               found = 1;
+                               break;
+                       }
+                       if (!found) {
+                               if (dev == MKDEV(0,0))
+                                       continue;
+                               printk("md%d: removing former faulty %s!\n",
+                                       mdidx(mddev), partition_name(dev));
+                       }
+                       remove_descriptor(desc, sb);
+                       continue;
+               }
+
+               if (dev == MKDEV(0,0))
+                       continue;
+               /*
+                * Is this device present in the rdev ring?
+                */
+               found = 0;
+               ITERATE_RDEV(mddev,rdev,tmp) {
+                       if (rdev->desc_nr == desc->number) {
+                               found = 1;
+                               break;
+                       }
+               }
+               if (found) 
+                       continue;
+
+               printk("md%d: former device %s is unavailable, removing from array!\n", mdidx(mddev), partition_name(dev));
+               remove_descriptor(desc, sb);
+       }
+
+       /*
+        * Double check wether all devices mentioned in the
+        * superblock are in the rdev ring.
+        */
+       for (i = 0; i < MD_SB_DISKS; i++) {
+               mdp_disk_t *desc;
+               kdev_t dev;
+
+               desc = sb->disks + i;
+               dev = MKDEV(desc->major, desc->minor);
+
+               if (dev == MKDEV(0,0))
+                       continue;
+
+               if (disk_faulty(desc)) {
+                       MD_BUG();
+                       goto abort;
+               }
+
+               rdev = find_rdev(mddev, dev);
+               if (!rdev) {
+                       MD_BUG();
+                       goto abort;
+               }
+       }
+
+       /*
+        * Do a final reality check.
+        */
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (rdev->desc_nr == -1) {
+                       MD_BUG();
+                       goto abort;
+               }
+               /*
+                * is the desc_nr unique?
+                */
+               ITERATE_RDEV(mddev,rdev2,tmp2) {
+                       if ((rdev2 != rdev) &&
+                                       (rdev2->desc_nr == rdev->desc_nr)) {
+                               MD_BUG();
+                               goto abort;
+                       }
+               }
+               /*
+                * is the device unique?
+                */
+               ITERATE_RDEV(mddev,rdev2,tmp2) {
+                       if ((rdev2 != rdev) &&
+                                       (rdev2->dev == rdev->dev)) {
+                               MD_BUG();
+                               goto abort;
+                       }
+               }
+       }
+
+       /*
+        * Check if we can support this RAID array
+        */
+       if (sb->major_version != MD_MAJOR_VERSION ||
+                       sb->minor_version > MD_MINOR_VERSION) {
+
+               printk (OLD_VERSION, mdidx(mddev), sb->major_version,
+                               sb->minor_version, sb->patch_version);
+               goto abort;
+       }
+
+       if ((sb->state != (1 << MD_SB_CLEAN)) && ((sb->level == 1) ||
+                       (sb->level == 4) || (sb->level == 5)))
+               printk (NOT_CLEAN_IGNORE, mdidx(mddev));
+
+       return 0;
+abort:
+       return 1;
+}
+
+#undef INCONSISTENT
+#undef OUT_OF_DATE
+#undef OLD_VERSION
+#undef OLD_LEVEL
+
+static int device_size_calculation (mddev_t * mddev)
+{
+       int data_disks = 0, persistent;
+       unsigned int readahead;
+       mdp_super_t *sb = mddev->sb;
+       struct md_list_head *tmp;
+       mdk_rdev_t *rdev;
+
+       /*
+        * Do device size calculation. Bail out if too small.
+        * (we have to do this after having validated chunk_size,
+        * because device size has to be modulo chunk_size)
+        */ 
+       persistent = !mddev->sb->not_persistent;
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (rdev->faulty)
+                       continue;
+               if (rdev->size) {
+                       MD_BUG();
+                       continue;
+               }
+               rdev->size = calc_dev_size(rdev->dev, mddev, persistent);
+               if (rdev->size < sb->chunk_size / 1024) {
+                       printk (KERN_WARNING
+                               "Dev %s smaller than chunk_size: %dk < %dk\n",
+                               partition_name(rdev->dev),
+                               rdev->size, sb->chunk_size / 1024);
+                       return -EINVAL;
+               }
+       }
+
+       switch (sb->level) {
+               case -3:
+                       data_disks = 1;
+                       break;
+               case -2:
+                       data_disks = 1;
+                       break;
+               case -1:
+                       zoned_raid_size(mddev);
+                       data_disks = 1;
+                       break;
+               case 0:
+                       zoned_raid_size(mddev);
+                       data_disks = sb->raid_disks;
+                       break;
+               case 1:
+                       data_disks = 1;
+                       break;
+               case 4:
+               case 5:
+                       data_disks = sb->raid_disks-1;
+                       break;
+               default:
+                       printk (UNKNOWN_LEVEL, mdidx(mddev), sb->level);
+                       goto abort;
+       }
+       if (!md_size[mdidx(mddev)])
+               md_size[mdidx(mddev)] = sb->size * data_disks;
+
+       readahead = MD_READAHEAD;
+       if ((sb->level == 0) || (sb->level == 4) || (sb->level == 5))
+               readahead = mddev->sb->chunk_size * 4 * data_disks;
+               if (readahead < data_disks * MAX_SECTORS*512*2) 
+                       readahead = data_disks * MAX_SECTORS*512*2;
+       else {
+               if (sb->level == -3)
+                       readahead = 0;
+       }
+       md_maxreadahead[mdidx(mddev)] = readahead;
+
+       printk(KERN_INFO "md%d: max total readahead window set to %dk\n",
+               mdidx(mddev), readahead/1024);
+
+       printk(KERN_INFO
+               "md%d: %d data-disks, max readahead per data-disk: %dk\n",
+                       mdidx(mddev), data_disks, readahead/data_disks/1024);
+       return 0;
+abort:
+       return 1;
+}
+
+
+#define TOO_BIG_CHUNKSIZE KERN_ERR \
+"too big chunk_size: %d > %d\n"
+
+#define TOO_SMALL_CHUNKSIZE KERN_ERR \
+"too small chunk_size: %d < %ld\n"
+
+#define BAD_CHUNKSIZE KERN_ERR \
+"no chunksize specified, see 'man raidtab'\n"
+
+static int do_md_run (mddev_t * mddev)
+{
+       int pnum, err;
+       int chunk_size;
+       struct md_list_head *tmp;
+       mdk_rdev_t *rdev;
+
+
+       if (!mddev->nb_dev) {
+               MD_BUG();
+               return -EINVAL;
+       }
+  
+       if (mddev->pers)
+               return -EBUSY;
+
+       /*
+        * Resize disks to align partitions size on a given
+        * chunk size.
+        */
+       md_size[mdidx(mddev)] = 0;
+
+       /*
+        * Analyze all RAID superblock(s)
+        */ 
+       if (analyze_sbs(mddev)) {
+               MD_BUG();
+               return -EINVAL;
+       }
+
+       chunk_size = mddev->sb->chunk_size;
+       pnum = level_to_pers(mddev->sb->level);
+
+       mddev->param.chunk_size = chunk_size;
+       mddev->param.personality = pnum;
+
+       if (chunk_size > MAX_CHUNK_SIZE) {
+               printk(TOO_BIG_CHUNKSIZE, chunk_size, MAX_CHUNK_SIZE);
+               return -EINVAL;
+       }
+       /*
+        * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
+        */
+       if ( (1 << ffz(~chunk_size)) != chunk_size) {
+               MD_BUG();
+               return -EINVAL;
+       }
+       if (chunk_size < PAGE_SIZE) {
+               printk(TOO_SMALL_CHUNKSIZE, chunk_size, PAGE_SIZE);
+               return -EINVAL;
+       }
+
+       if (pnum >= MAX_PERSONALITY) {
+               MD_BUG();
+               return -EINVAL;
+       }
+
+       if ((pnum != RAID1) && (pnum != LINEAR) && !chunk_size) {
+               /*
+                * 'default chunksize' in the old md code used to
+                * be PAGE_SIZE, baaad.
+                * we abort here to be on the safe side. We dont
+                * want to continue the bad practice.
+                */
+               printk(BAD_CHUNKSIZE);
+               return -EINVAL;
+       }
+
+       if (!pers[pnum])
+       {
+#ifdef CONFIG_KMOD
+               char module_name[80];
+               sprintf (module_name, "md-personality-%d", pnum);
+               request_module (module_name);
+               if (!pers[pnum])
+#endif
+                       return -EINVAL;
+       }
+  
+       if (device_size_calculation(mddev))
+               return -EINVAL;
+
+       /*
+        * Drop all container device buffers, from now on
+        * the only valid external interface is through the md
+        * device.
+        */
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (rdev->faulty)
+                       continue;
+               fsync_dev(rdev->dev);
+               invalidate_buffers(rdev->dev);
+       }
+  
+       mddev->pers = pers[pnum];
+  
+       err = mddev->pers->run(mddev);
+       if (err) {
+               printk("pers->run() failed ...\n");
+               mddev->pers = NULL;
+               return -EINVAL;
+       }
+
+       mddev->sb->state &= ~(1 << MD_SB_CLEAN);
+       md_update_sb(mddev);
+
+       /*
+        * md_size has units of 1K blocks, which are
+        * twice as large as sectors.
+        */
+       md_hd_struct[mdidx(mddev)].start_sect = 0;
+       md_hd_struct[mdidx(mddev)].nr_sects = md_size[mdidx(mddev)] << 1;
+  
+       read_ahead[MD_MAJOR] = 1024;
+       return (0);
+}
+
+#undef TOO_BIG_CHUNKSIZE
+#undef BAD_CHUNKSIZE
+
+#define OUT(x) do { err = (x); goto out; } while (0)
+
+static int restart_array (mddev_t *mddev)
+{
+       int err = 0;
+ 
+       /*
+        * Complain if it has no devices
+        */
+       if (!mddev->nb_dev)
+               OUT(-ENXIO);
+
+       if (mddev->pers) {
+               if (!mddev->ro)
+                       OUT(-EBUSY);
+
+               mddev->ro = 0;
+               set_device_ro(mddev_to_kdev(mddev), 0);
+
+               printk (KERN_INFO
+                       "md%d switched to read-write mode.\n", mdidx(mddev));
+               /*
+                * Kick recovery or resync if necessary
+                */
+               md_recover_arrays();
+               if (mddev->pers->restart_resync)
+                       mddev->pers->restart_resync(mddev);
+       } else
+               err = -EINVAL;
+ 
+out:
+       return err;
+}
+
+#define STILL_MOUNTED KERN_WARNING \
+"md: md%d still mounted.\n"
+
+static int do_md_stop (mddev_t * mddev, int ro)
+{
+       int err = 0, resync_interrupted = 0;
+       kdev_t dev = mddev_to_kdev(mddev);
+ 
+       if (!ro && !fs_may_mount (dev)) {
+               printk (STILL_MOUNTED, mdidx(mddev));
+               OUT(-EBUSY);
+       }
+  
+       /*
+        * complain if it's already stopped
+        */
+       if (!mddev->nb_dev)
+               OUT(-ENXIO);
+
+       if (mddev->pers) {
+               /*
+                * It is safe to call stop here, it only frees private
+                * data. Also, it tells us if a device is unstoppable
+                * (eg. resyncing is in progress)
+                */
+               if (mddev->pers->stop_resync)
+                       if (mddev->pers->stop_resync(mddev))
+                               resync_interrupted = 1;
+
+               if (mddev->recovery_running)
+                       md_interrupt_thread(md_recovery_thread);
+
+               /*
+                * This synchronizes with signal delivery to the
+                * resync or reconstruction thread. It also nicely
+                * hangs the process if some reconstruction has not
+                * finished.
+                */
+               down(&mddev->recovery_sem);
+               up(&mddev->recovery_sem);
+
+               /*
+                *  sync and invalidate buffers because we cannot kill the
+                *  main thread with valid IO transfers still around.
+                *  the kernel lock protects us from new requests being
+                *  added after invalidate_buffers().
+                */
+               fsync_dev (mddev_to_kdev(mddev));
+               fsync_dev (dev);
+               invalidate_buffers (dev);
+
+               if (ro) {
+                       if (mddev->ro)
+                               OUT(-ENXIO);
+                       mddev->ro = 1;
+               } else {
+                       if (mddev->ro)
+                               set_device_ro(dev, 0);
+                       if (mddev->pers->stop(mddev)) {
+                               if (mddev->ro)
+                                       set_device_ro(dev, 1);
+                               OUT(-EBUSY);
+                       }
+                       if (mddev->ro)
+                               mddev->ro = 0;
+               }
+               if (mddev->sb) {
+                       /*
+                        * mark it clean only if there was no resync
+                        * interrupted.
+                        */
+                       if (!mddev->recovery_running && !resync_interrupted) {
+                               printk("marking sb clean...\n");
+                               mddev->sb->state |= 1 << MD_SB_CLEAN;
+                       }
+                       md_update_sb(mddev);
+               }
+               if (ro)
+                       set_device_ro(dev, 1);
+       }
+ 
+       /*
+        * Free resources if final stop
+        */
+       if (!ro) {
+               export_array(mddev);
+               md_size[mdidx(mddev)] = 0;
+               md_hd_struct[mdidx(mddev)].nr_sects = 0;
+               free_mddev(mddev);
+
+               printk (KERN_INFO "md%d stopped.\n", mdidx(mddev));
+       } else
+               printk (KERN_INFO
+                       "md%d switched to read-only mode.\n", mdidx(mddev));
+out:
+       return err;
+}
+
+#undef OUT
+
+/*
+ * We have to safely support old arrays too.
+ */
+int detect_old_array (mdp_super_t *sb)
+{
+       if (sb->major_version > 0)
+               return 0;
+       if (sb->minor_version >= 90)
+               return 0;
+
+       return -EINVAL;
+}
+
+
+static void autorun_array (mddev_t *mddev)
+{
+       mdk_rdev_t *rdev;
+        struct md_list_head *tmp;
+       int err;
+
+       if (mddev->disks.prev == &mddev->disks) {
+               MD_BUG();
+               return;
+       }
+
+       printk("running: ");
+
+        ITERATE_RDEV(mddev,rdev,tmp) {
+               printk("<%s>", partition_name(rdev->dev));
+       }
+       printk("\nnow!\n");
+
+       err = do_md_run (mddev);
+       if (err) {
+               printk("do_md_run() returned %d\n", err);
+               /*
+                * prevent the writeback of an unrunnable array
+                */
+               mddev->sb_dirty = 0;
+               do_md_stop (mddev, 0);
+       }
+}
+
+/*
+ * lets try to run arrays based on all disks that have arrived
+ * until now. (those are in the ->pending list)
+ *
+ * the method: pick the first pending disk, collect all disks with
+ * the same UUID, remove all from the pending list and put them into
+ * the 'same_array' list. Then order this list based on superblock
+ * update time (freshest comes first), kick out 'old' disks and
+ * compare superblocks. If everything's fine then run it.
+ */
+static void autorun_devices (void)
+{
+       struct md_list_head candidates;
+       struct md_list_head *tmp;
+       mdk_rdev_t *rdev0, *rdev;
+       mddev_t *mddev;
+       kdev_t md_kdev;
+
+
+       printk("autorun ...\n");
+       while (pending_raid_disks.next != &pending_raid_disks) {
+               rdev0 = md_list_entry(pending_raid_disks.next,
+                                        mdk_rdev_t, pending);
+
+               printk("considering %s ...\n", partition_name(rdev0->dev));
+               MD_INIT_LIST_HEAD(&candidates);
+               ITERATE_RDEV_PENDING(rdev,tmp) {
+                       if (uuid_equal(rdev0, rdev)) {
+                               if (!sb_equal(rdev0->sb, rdev->sb)) {
+                                       printk("%s has same UUID as %s, but superblocks differ ...\n", partition_name(rdev->dev), partition_name(rdev0->dev));
+                                       continue;
+                               }
+                               printk("  adding %s ...\n", partition_name(rdev->dev));
+                               md_list_del(&rdev->pending);
+                               md_list_add(&rdev->pending, &candidates);
+                       }
+               }
                /*
-                * Check the superblock for consistency.
-                * The personality itself has to check whether it's getting
-                * added with the proper flags.  The personality has to be
-                 * checked too. ;)
+                * now we have a set of devices, with all of them having
+                * mostly sane superblocks. It's time to allocate the
+                * mddev.
                 */
-               if (analyze_one_sb (realdev))
+               md_kdev = MKDEV(MD_MAJOR, rdev0->sb->md_minor);
+               mddev = kdev_to_mddev(md_kdev);
+               if (mddev) {
+                       printk("md%d already running, cannot run %s\n",
+                                mdidx(mddev), partition_name(rdev0->dev));
+                       ITERATE_RDEV_GENERIC(candidates,pending,rdev,tmp)
+                               export_rdev(rdev);
+                       continue;
+               }
+               mddev = alloc_mddev(md_kdev);
+               printk("created md%d\n", mdidx(mddev));
+               ITERATE_RDEV_GENERIC(candidates,pending,rdev,tmp) {
+                       bind_rdev_to_array(rdev, mddev);
+                       md_list_del(&rdev->pending);
+                       MD_INIT_LIST_HEAD(&rdev->pending);
+               }
+               autorun_array(mddev);
+       }
+       printk("... autorun DONE.\n");
+}
+
+/*
+ * import RAID devices based on one partition
+ * if possible, the array gets run as well.
+ */
+
+#define BAD_VERSION KERN_ERR \
+"md: %s has RAID superblock version 0.%d, autodetect needs v0.90 or higher\n"
+
+#define OUT_OF_MEM KERN_ALERT \
+"md: out of memory.\n"
+
+#define NO_DEVICE KERN_ERR \
+"md: disabled device %s\n"
+
+#define AUTOADD_FAILED KERN_ERR \
+"md: auto-adding devices to md%d FAILED (error %d).\n"
+
+#define AUTOADD_FAILED_USED KERN_ERR \
+"md: cannot auto-add device %s to md%d, already used.\n"
+
+#define AUTORUN_FAILED KERN_ERR \
+"md: auto-running md%d FAILED (error %d).\n"
+
+#define MDDEV_BUSY KERN_ERR \
+"md: cannot auto-add to md%d, already running.\n"
+
+#define AUTOADDING KERN_INFO \
+"md: auto-adding devices to md%d, based on %s's superblock.\n"
+
+#define AUTORUNNING KERN_INFO \
+"md: auto-running md%d.\n"
+
+static int autostart_array (kdev_t startdev)
+{
+       int err = -EINVAL, i;
+       mdp_super_t *sb = NULL;
+       mdk_rdev_t *start_rdev = NULL, *rdev;
+
+       if (md_import_device(startdev, 1)) {
+               printk("could not import %s!\n", partition_name(startdev));
+               goto abort;
+       }
+
+       start_rdev = find_rdev_all(startdev);
+       if (!start_rdev) {
+               MD_BUG();
+               goto abort;
+       }
+       if (start_rdev->faulty) {
+               printk("can not autostart based on faulty %s!\n",
+                                               partition_name(startdev));
+               goto abort;
+       }
+       md_list_add(&start_rdev->pending, &pending_raid_disks);
+
+       sb = start_rdev->sb;
+
+       err = detect_old_array(sb);
+       if (err) {
+               printk("array version is too old to be autostarted, use raidtools 0.90 mkraid --upgrade\nto upgrade the array without data loss!\n");
+               goto abort;
+       }
+
+       for (i = 0; i < MD_SB_DISKS; i++) {
+               mdp_disk_t *desc;
+               kdev_t dev;
+
+               desc = sb->disks + i;
+               dev = MKDEV(desc->major, desc->minor);
+
+               if (dev == MKDEV(0,0))
+                       continue;
+               if (dev == startdev)
+                       continue;
+               if (md_import_device(dev, 1)) {
+                       printk("could not import %s, trying to run array nevertheless.\n", partition_name(dev));
+                       continue;
+               }
+               rdev = find_rdev_all(dev);
+               if (!rdev) {
+                       MD_BUG();
+                       goto abort;
+               }
+               md_list_add(&rdev->pending, &pending_raid_disks);
+       }
+
+       /*
+        * possibly return codes
+        */
+       autorun_devices();
+       return 0;
+
+abort:
+       if (start_rdev)
+               export_rdev(start_rdev);
+       return err;
+}
+
+#undef BAD_VERSION
+#undef OUT_OF_MEM
+#undef NO_DEVICE
+#undef AUTOADD_FAILED_USED
+#undef AUTOADD_FAILED
+#undef AUTORUN_FAILED
+#undef AUTOADDING
+#undef AUTORUNNING
+
+struct {
+       int set;
+       int noautodetect;
+
+} raid_setup_args md__initdata = { 0, 0 };
+
+/*
+ * Searches all registered partitions for autorun RAID arrays
+ * at boot time.
+ */
+md__initfunc(void autodetect_raid(void))
+{
+#ifdef CONFIG_AUTODETECT_RAID
+       struct gendisk *disk;
+       mdk_rdev_t *rdev;
+       int i;
+
+       if (raid_setup_args.noautodetect) {
+               printk(KERN_INFO "skipping autodetection of RAID arrays\n");
+               return;
+       }
+       printk(KERN_INFO "autodetecting RAID arrays\n");
+
+       for (disk = gendisk_head ; disk ; disk = disk->next) {
+               for (i = 0; i < disk->max_p*disk->max_nr; i++) {
+                       kdev_t dev = MKDEV(disk->major,i);
+
+                       if (disk->part[i].type == LINUX_OLD_RAID_PARTITION) {
+                               printk(KERN_ALERT
+"md: %s's partition type has to be changed from type 0x86 to type 0xfd\n"
+"    to maintain interoperability with other OSs! Autodetection support for\n"
+"    type 0x86 will be deleted after some migration timeout. Sorry.\n",
+                                       partition_name(dev));
+                               disk->part[i].type = LINUX_RAID_PARTITION;
+                       }
+                       if (disk->part[i].type != LINUX_RAID_PARTITION)
+                               continue;
+
+                       if (md_import_device(dev,1)) {
+                               printk(KERN_ALERT "could not import %s!\n",
+                                                       partition_name(dev));
+                               continue;
+                       }
+                       /*
+                        * Sanity checks:
+                        */
+                       rdev = find_rdev_all(dev);
+                       if (!rdev) {
+                               MD_BUG();
+                               continue;
+                       }
+                       if (rdev->faulty) {
+                               MD_BUG();
+                               continue;
+                       }
+                       md_list_add(&rdev->pending, &pending_raid_disks);
+               }
+       }
+
+       autorun_devices();
+#endif
+}
+
+static int get_version (void * arg)
+{
+       mdu_version_t ver;
+
+       ver.major = MD_MAJOR_VERSION;
+       ver.minor = MD_MINOR_VERSION;
+       ver.patchlevel = MD_PATCHLEVEL_VERSION;
+
+       if (md_copy_to_user(arg, &ver, sizeof(ver)))
+               return -EFAULT;
+
+       return 0;
+}
+
+#define SET_FROM_SB(x) info.x = mddev->sb->x
+static int get_array_info (mddev_t * mddev, void * arg)
+{
+       mdu_array_info_t info;
+
+       if (!mddev->sb)
+               return -EINVAL;
+
+       SET_FROM_SB(major_version);
+       SET_FROM_SB(minor_version);
+       SET_FROM_SB(patch_version);
+       SET_FROM_SB(ctime);
+       SET_FROM_SB(level);
+       SET_FROM_SB(size);
+       SET_FROM_SB(nr_disks);
+       SET_FROM_SB(raid_disks);
+       SET_FROM_SB(md_minor);
+       SET_FROM_SB(not_persistent);
+
+       SET_FROM_SB(utime);
+       SET_FROM_SB(state);
+       SET_FROM_SB(active_disks);
+       SET_FROM_SB(working_disks);
+       SET_FROM_SB(failed_disks);
+       SET_FROM_SB(spare_disks);
+
+       SET_FROM_SB(layout);
+       SET_FROM_SB(chunk_size);
+
+       if (md_copy_to_user(arg, &info, sizeof(info)))
+               return -EFAULT;
+
+       return 0;
+}
+#undef SET_FROM_SB
+
+#define SET_FROM_SB(x) info.x = mddev->sb->disks[nr].x
+static int get_disk_info (mddev_t * mddev, void * arg)
+{
+       mdu_disk_info_t info;
+       unsigned int nr;
+
+       if (!mddev->sb)
+               return -EINVAL;
+
+       if (md_copy_from_user(&info, arg, sizeof(info)))
+               return -EFAULT;
+
+       nr = info.number;
+       if (nr >= mddev->sb->nr_disks)
+               return -EINVAL;
+
+       SET_FROM_SB(major);
+       SET_FROM_SB(minor);
+       SET_FROM_SB(raid_disk);
+       SET_FROM_SB(state);
+
+       if (md_copy_to_user(arg, &info, sizeof(info)))
+               return -EFAULT;
+
+       return 0;
+}
+#undef SET_FROM_SB
+
+#define SET_SB(x) mddev->sb->disks[nr].x = info.x
+
+static int add_new_disk (mddev_t * mddev, void * arg)
+{
+       int err, size, persistent;
+       mdu_disk_info_t info;
+       mdk_rdev_t *rdev;
+       unsigned int nr;
+       kdev_t dev;
+
+       if (!mddev->sb)
+               return -EINVAL;
+
+       if (md_copy_from_user(&info, arg, sizeof(info)))
+               return -EFAULT;
+
+       nr = info.number;
+       if (nr >= mddev->sb->nr_disks)
+               return -EINVAL;
+
+       dev = MKDEV(info.major,info.minor);
+
+       if (find_rdev_all(dev)) {
+               printk("device %s already used in a RAID array!\n", 
+                               partition_name(dev));
+               return -EBUSY;
+       }
+
+       SET_SB(number);
+       SET_SB(major);
+       SET_SB(minor);
+       SET_SB(raid_disk);
+       SET_SB(state);
+ 
+       if ((info.state & (1<<MD_DISK_FAULTY))==0) {
+               err = md_import_device (dev, 0);
+               if (err) {
+                       printk("md: error, md_import_device() returned %d\n", err);
+                       return -EINVAL;
+               }
+               rdev = find_rdev_all(dev);
+               if (!rdev) {
+                       MD_BUG();
                        return -EINVAL;
+               }
+ 
+               rdev->old_dev = dev;
+               rdev->desc_nr = info.number;
+ 
+               bind_rdev_to_array(rdev, mddev);
+ 
+               persistent = !mddev->sb->not_persistent;
+               if (!persistent)
+                       printk("nonpersistent superblock ...\n");
+               if (!mddev->sb->chunk_size)
+                       printk("no chunksize?\n");
+ 
+               size = calc_dev_size(dev, mddev, persistent);
+               rdev->sb_offset = calc_dev_sboffset(dev, mddev, persistent);
+ 
+               if (!mddev->sb->size || (mddev->sb->size > size))
+                       mddev->sb->size = size;
+       }
+ 
+       /*
+        * sync all other superblocks with the main superblock
+        */
+       sync_sbs(mddev);
+
+       return 0;
+}
+#undef SET_SB
+
+static int hot_remove_disk (mddev_t * mddev, kdev_t dev)
+{
+       int err;
+       mdk_rdev_t *rdev;
+       mdp_disk_t *disk;
+
+       if (!mddev->pers)
+               return -ENODEV;
+
+       printk("trying to remove %s from md%d ... \n",
+               partition_name(dev), mdidx(mddev));
+
+       if (!mddev->pers->diskop) {
+               printk("md%d: personality does not support diskops!\n",
+                                                                mdidx(mddev));
+               return -EINVAL;
+       }
+
+       rdev = find_rdev(mddev, dev);
+       if (!rdev)
+               return -ENXIO;
+
+       if (rdev->desc_nr == -1) {
+               MD_BUG();
+               return -EINVAL;
+       }
+       disk = &mddev->sb->disks[rdev->desc_nr];
+       if (disk_active(disk))
+               goto busy;
+       if (disk_removed(disk)) {
+               MD_BUG();
+               return -EINVAL;
+       }
+       
+       err = mddev->pers->diskop(mddev, &disk, DISKOP_HOT_REMOVE_DISK);
+       if (err == -EBUSY)
+               goto busy;
+       if (err) {
+               MD_BUG();
+               return -EINVAL;
+       }
+
+       remove_descriptor(disk, mddev->sb);
+       kick_rdev_from_array(rdev);
+       mddev->sb_dirty = 1;
+       md_update_sb(mddev);
+
+       return 0;
+busy:
+       printk("cannot remove active disk %s from md%d ... \n",
+               partition_name(dev), mdidx(mddev));
+       return -EBUSY;
+}
+
+static int hot_add_disk (mddev_t * mddev, kdev_t dev)
+{
+       int i, err, persistent;
+       unsigned int size;
+       mdk_rdev_t *rdev;
+       mdp_disk_t *disk;
+
+       if (!mddev->pers)
+               return -ENODEV;
+
+       printk("trying to hot-add %s to md%d ... \n",
+               partition_name(dev), mdidx(mddev));
+
+       if (!mddev->pers->diskop) {
+               printk("md%d: personality does not support diskops!\n",
+                                                                mdidx(mddev));
+               return -EINVAL;
+       }
+
+       persistent = !mddev->sb->not_persistent;
+       size = calc_dev_size(dev, mddev, persistent);
+
+       if (size < mddev->sb->size) {
+               printk("md%d: disk size %d blocks < array size %d\n",
+                               mdidx(mddev), size, mddev->sb->size);
+               return -ENOSPC;
+       }
+
+       rdev = find_rdev(mddev, dev);
+       if (rdev)
+               return -EBUSY;
+
+       err = md_import_device (dev, 0);
+       if (err) {
+               printk("md: error, md_import_device() returned %d\n", err);
+               return -EINVAL;
+       }
+       rdev = find_rdev_all(dev);
+       if (!rdev) {
+               MD_BUG();
+               return -EINVAL;
+       }
+       if (rdev->faulty) {
+               printk("md: can not hot-add faulty %s disk to md%d!\n",
+                               partition_name(dev), mdidx(mddev));
+               err = -EINVAL;
+               goto abort_export;
+       }
+       bind_rdev_to_array(rdev, mddev);
+
+       /*
+        * The rest should better be atomic, we can have disk failures
+        * noticed in interrupt contexts ...
+        */
+       cli();
+       rdev->old_dev = dev;
+       rdev->size = size;
+       rdev->sb_offset = calc_dev_sboffset(dev, mddev, persistent);
+
+       disk = mddev->sb->disks + mddev->sb->raid_disks;
+       for (i = mddev->sb->raid_disks; i < MD_SB_DISKS; i++) {
+               disk = mddev->sb->disks + i;
+
+               if (!disk->major && !disk->minor)
+                       break;
+               if (disk_removed(disk))
+                       break;
+       }
+       if (i == MD_SB_DISKS) {
+               sti();
+               printk("md%d: can not hot-add to full array!\n", mdidx(mddev));
+               err = -EBUSY;
+               goto abort_unbind_export;
+       }
+
+       if (disk_removed(disk)) {
                /*
-                * hot_add has to bump up nb_dev itself
+                * reuse slot
                 */
-               if (md_dev[minor].pers->hot_add_disk (&md_dev[minor], dev)) {
-                       /*
-                        * FIXME: here we should free up the inode and stuff
-                        */
-                       printk ("FIXME\n");
-                       return -EINVAL;
+               if (disk->number != i) {
+                       sti();
+                       MD_BUG();
+                       err = -EINVAL;
+                       goto abort_unbind_export;
                }
-       } else
-               md_dev[minor].nb_dev++;
+       } else {
+               disk->number = i;
+       }
 
-       printk ("REGISTER_DEV %s to md%x done\n", partition_name(dev), minor);
-       return (0);
+       disk->raid_disk = disk->number;
+       disk->major = MAJOR(dev);
+       disk->minor = MINOR(dev);
+
+       if (mddev->pers->diskop(mddev, &disk, DISKOP_HOT_ADD_DISK)) {
+               sti();
+               MD_BUG();
+               err = -EINVAL;
+               goto abort_unbind_export;
+       }
+
+       mark_disk_spare(disk);
+       mddev->sb->nr_disks++;
+       mddev->sb->spare_disks++;
+       mddev->sb->working_disks++;
+
+       mddev->sb_dirty = 1;
+
+       sti();
+       md_update_sb(mddev);
+
+       /*
+        * Kick recovery, maybe this spare has to be added to the
+        * array immediately.
+        */
+       md_recover_arrays();
+
+       return 0;
+
+abort_unbind_export:
+       unbind_rdev_from_array(rdev);
+
+abort_export:
+       export_rdev(rdev);
+       return err;
+}
+
+#define SET_SB(x) mddev->sb->x = info.x
+static int set_array_info (mddev_t * mddev, void * arg)
+{
+       mdu_array_info_t info;
+
+       if (mddev->sb) {
+               printk("array md%d already has a superblock!\n", 
+                               mdidx(mddev));
+               return -EBUSY;
+       }
+
+       if (md_copy_from_user(&info, arg, sizeof(info)))
+               return -EFAULT;
+
+       if (alloc_array_sb(mddev))
+               return -ENOMEM;
+
+       mddev->sb->major_version = MD_MAJOR_VERSION;
+       mddev->sb->minor_version = MD_MINOR_VERSION;
+       mddev->sb->patch_version = MD_PATCHLEVEL_VERSION;
+       mddev->sb->ctime = CURRENT_TIME;
+
+       SET_SB(level);
+       SET_SB(size);
+       SET_SB(nr_disks);
+       SET_SB(raid_disks);
+       SET_SB(md_minor);
+       SET_SB(not_persistent);
+
+       SET_SB(state);
+       SET_SB(active_disks);
+       SET_SB(working_disks);
+       SET_SB(failed_disks);
+       SET_SB(spare_disks);
+
+       SET_SB(layout);
+       SET_SB(chunk_size);
+
+       mddev->sb->md_magic = MD_SB_MAGIC;
+
+       /*
+        * Generate a 128 bit UUID
+        */
+       get_random_bytes(&mddev->sb->set_uuid0, 4);
+       get_random_bytes(&mddev->sb->set_uuid1, 4);
+       get_random_bytes(&mddev->sb->set_uuid2, 4);
+       get_random_bytes(&mddev->sb->set_uuid3, 4);
+
+       return 0;
+}
+#undef SET_SB
+
+static int set_disk_info (mddev_t * mddev, void * arg)
+{
+       printk("not yet");
+       return -EINVAL;
+}
+
+static int clear_array (mddev_t * mddev)
+{
+       printk("not yet");
+       return -EINVAL;
+}
+
+static int write_raid_info (mddev_t * mddev)
+{
+       printk("not yet");
+       return -EINVAL;
+}
+
+static int protect_array (mddev_t * mddev)
+{
+       printk("not yet");
+       return -EINVAL;
+}
+
+static int unprotect_array (mddev_t * mddev)
+{
+       printk("not yet");
+       return -EINVAL;
+}
+
+static int set_disk_faulty (mddev_t *mddev, kdev_t dev)
+{
+       int ret;
+
+       fsync_dev(mddev_to_kdev(mddev));
+       ret = md_error(mddev_to_kdev(mddev), dev);
+       return ret;
 }
 
 static int md_ioctl (struct inode *inode, struct file *file,
                      unsigned int cmd, unsigned long arg)
 {
-  int minor, err;
-  struct hd_geometry *loc = (struct hd_geometry *) arg;
+       unsigned int minor;
+       int err = 0;
+       struct hd_geometry *loc = (struct hd_geometry *) arg;
+       mddev_t *mddev = NULL;
+       kdev_t dev;
 
-  if (!capable(CAP_SYS_ADMIN))
-    return -EACCES;
+       if (!md_capable_admin())
+               return -EACCES;
 
-  if (((minor=MINOR(inode->i_rdev)) & 0x80) &&
-      (minor & 0x7f) < MAX_PERSONALITY &&
-      pers[minor & 0x7f] &&
-      pers[minor & 0x7f]->ioctl)
-    return (pers[minor & 0x7f]->ioctl (inode, file, cmd, arg));
-  
-  if (minor >= MAX_MD_DEV)
-    return -EINVAL;
+       dev = inode->i_rdev;
+       minor = MINOR(dev);
+       if (minor >= MAX_MD_DEVS)
+               return -EINVAL;
 
-  switch (cmd)
-  {
-    case REGISTER_DEV:
-      return do_md_add (minor, to_kdev_t ((dev_t) arg));
+       /*
+        * Commands dealing with the RAID driver but not any
+        * particular array:
+        */
+       switch (cmd)
+       {
+               case RAID_VERSION:
+                       err = get_version((void *)arg);
+                       goto done;
+
+               case PRINT_RAID_DEBUG:
+                       err = 0;
+                       md_print_devices();
+                       goto done_unlock;
+      
+               case BLKGETSIZE:   /* Return device size */
+                       if (!arg) {
+                               err = -EINVAL;
+                               goto abort;
+                       }
+                       err = md_put_user(md_hd_struct[minor].nr_sects,
+                                               (long *) arg);
+                       goto done;
 
-    case START_MD:
-      return do_md_run (minor, (int) arg);
+               case BLKFLSBUF:
+                       fsync_dev(dev);
+                       invalidate_buffers(dev);
+                       goto done;
 
-    case STOP_MD:
-      return do_md_stop (minor, inode);
-      
-    case BLKGETSIZE:   /* Return device size */
-    if  (!arg)  return -EINVAL;
-    err = put_user (md_hd_struct[MINOR(inode->i_rdev)].nr_sects, (long *) arg);
-    if (err)
-      return err;
-    break;
-
-    case BLKFLSBUF:
-    fsync_dev (inode->i_rdev);
-    invalidate_buffers (inode->i_rdev);
-    break;
-
-    case BLKRASET:
-    if (arg > 0xff)
-      return -EINVAL;
-    read_ahead[MAJOR(inode->i_rdev)] = arg;
-    return 0;
-    
-    case BLKRAGET:
-    if  (!arg)  return -EINVAL;
-    err = put_user (read_ahead[MAJOR(inode->i_rdev)], (long *) arg);
-    if (err)
-      return err;
-    break;
-
-    /* We have a problem here : there is no easy way to give a CHS
-       virtual geometry. We currently pretend that we have a 2 heads
-       4 sectors (with a BIG number of cylinders...). This drives dosfs
-       just mad... ;-) */
-    
-    case HDIO_GETGEO:
-    if (!loc)  return -EINVAL;
-    err = put_user (2, (char *) &loc->heads);
-    if (err)
-      return err;
-    err = put_user (4, (char *) &loc->sectors);
-    if (err)
-      return err;
-    err = put_user (md_hd_struct[minor].nr_sects/8, (short *) &loc->cylinders);
-    if (err)
-      return err;
-    err = put_user (md_hd_struct[MINOR(inode->i_rdev)].start_sect,
-               (long *) &loc->start);
-    if (err)
-      return err;
-    break;
-    
-    RO_IOCTLS(inode->i_rdev,arg);
+               case BLKRASET:
+                       if (arg > 0xff) {
+                               err = -EINVAL;
+                               goto abort;
+                       }
+                       read_ahead[MAJOR(dev)] = arg;
+                       goto done;
     
-    default:
-    return -EINVAL;
-  }
+               case BLKRAGET:
+                       if (!arg) {
+                               err = -EINVAL;
+                               goto abort;
+                       }
+                       err = md_put_user (read_ahead[
+                               MAJOR(dev)], (long *) arg);
+                       goto done;
+               default:
+       }
+
+       /*
+        * Commands creating/starting a new array:
+        */
+
+       mddev = kdev_to_mddev(dev);
+
+       switch (cmd)
+       {
+               case SET_ARRAY_INFO:
+               case START_ARRAY:
+                       if (mddev) {
+                               printk("array md%d already exists!\n",
+                                                               mdidx(mddev));
+                               err = -EEXIST;
+                               goto abort;
+                       }
+               default:
+       }
+
+       switch (cmd)
+       {
+               case SET_ARRAY_INFO:
+                       mddev = alloc_mddev(dev);
+                       if (!mddev) {
+                               err = -ENOMEM;
+                               goto abort;
+                       }
+                       /*
+                        * alloc_mddev() should possibly self-lock.
+                        */
+                       err = lock_mddev(mddev);
+                       if (err) {
+                               printk("ioctl, reason %d, cmd %d\n", err, cmd);
+                               goto abort;
+                       }
+                       err = set_array_info(mddev, (void *)arg);
+                       if (err) {
+                               printk("couldnt set array info. %d\n", err);
+                               goto abort;
+                       }
+                       goto done_unlock;
+
+               case START_ARRAY:
+                       /*
+                        * possibly make it lock the array ...
+                        */
+                       err = autostart_array((kdev_t)arg);
+                       if (err) {
+                               printk("autostart %s failed!\n",
+                                       partition_name((kdev_t)arg));
+                               goto abort;
+                       }
+                       goto done;
+      
+               default:
+       }
+      
+       /*
+        * Commands querying/configuring an existing array:
+        */
+
+       if (!mddev) {
+               err = -ENODEV;
+               goto abort;
+       }
+       err = lock_mddev(mddev);
+       if (err) {
+               printk("ioctl lock interrupted, reason %d, cmd %d\n",err, cmd);
+               goto abort;
+       }
+
+       /*
+        * Commands even a read-only array can execute:
+        */
+       switch (cmd)
+       {
+               case GET_ARRAY_INFO:
+                       err = get_array_info(mddev, (void *)arg);
+                       goto done_unlock;
+
+               case GET_DISK_INFO:
+                       err = get_disk_info(mddev, (void *)arg);
+                       goto done_unlock;
+      
+               case RESTART_ARRAY_RW:
+                       err = restart_array(mddev);
+                       goto done_unlock;
+
+               case STOP_ARRAY:
+                       err = do_md_stop (mddev, 0);
+                       goto done_unlock;
+      
+               case STOP_ARRAY_RO:
+                       err = do_md_stop (mddev, 1);
+                       goto done_unlock;
+      
+       /*
+        * We have a problem here : there is no easy way to give a CHS
+        * virtual geometry. We currently pretend that we have a 2 heads
+        * 4 sectors (with a BIG number of cylinders...). This drives
+        * dosfs just mad... ;-)
+        */
+               case HDIO_GETGEO:
+                       if (!loc) {
+                               err = -EINVAL;
+                               goto abort_unlock;
+                       }
+                       err = md_put_user (2, (char *) &loc->heads);
+                       if (err)
+                               goto abort_unlock;
+                       err = md_put_user (4, (char *) &loc->sectors);
+                       if (err)
+                               goto abort_unlock;
+                       err = md_put_user (md_hd_struct[mdidx(mddev)].nr_sects/8,
+                                               (short *) &loc->cylinders);
+                       if (err)
+                               goto abort_unlock;
+                       err = md_put_user (md_hd_struct[minor].start_sect,
+                                               (long *) &loc->start);
+                       goto done_unlock;
+       }
 
-  return (0);
+       /*
+        * The remaining ioctls are changing the state of the
+        * superblock, so we do not allow read-only arrays
+        * here:
+        */
+       if (mddev->ro) {
+               err = -EROFS;
+               goto abort_unlock;
+       }
+
+       switch (cmd)
+       {
+               case CLEAR_ARRAY:
+                       err = clear_array(mddev);
+                       goto done_unlock;
+      
+               case ADD_NEW_DISK:
+                       err = add_new_disk(mddev, (void *)arg);
+                       goto done_unlock;
+      
+               case HOT_REMOVE_DISK:
+                       err = hot_remove_disk(mddev, (kdev_t)arg);
+                       goto done_unlock;
+      
+               case HOT_ADD_DISK:
+                       err = hot_add_disk(mddev, (kdev_t)arg);
+                       goto done_unlock;
+      
+               case SET_DISK_INFO:
+                       err = set_disk_info(mddev, (void *)arg);
+                       goto done_unlock;
+      
+               case WRITE_RAID_INFO:
+                       err = write_raid_info(mddev);
+                       goto done_unlock;
+      
+               case UNPROTECT_ARRAY:
+                       err = unprotect_array(mddev);
+                       goto done_unlock;
+      
+               case PROTECT_ARRAY:
+                       err = protect_array(mddev);
+                       goto done_unlock;
+
+               case SET_DISK_FAULTY:
+                       err = set_disk_faulty(mddev, (kdev_t)arg);
+                       goto done_unlock;
+      
+               case RUN_ARRAY:
+               {
+                       mdu_param_t param;
+
+                       err = md_copy_from_user(&param, (mdu_param_t *)arg,
+                                                        sizeof(param));
+                       if (err)
+                               goto abort_unlock;
+
+                       err = do_md_run (mddev);
+                       /*
+                        * we have to clean up the mess if
+                        * the array cannot be run for some
+                        * reason ...
+                        */
+                       if (err) {
+                               mddev->sb_dirty = 0;
+                               do_md_stop (mddev, 0);
+                       }
+                       goto done_unlock;
+               }
+      
+               default:
+                       printk(KERN_WARNING "%s(pid %d) used obsolete MD ioctl, upgrade your software to use new ictls.\n", current->comm, current->pid);
+                       err = -EINVAL;
+                       goto abort_unlock;
+       }
+
+done_unlock:
+abort_unlock:
+       if (mddev)
+               unlock_mddev(mddev);
+       else
+               printk("huh11?\n");
+
+       return err;
+done:
+       if (err)
+               printk("huh12?\n");
+abort:
+       return err;
 }
 
+
+#if LINUX_VERSION_CODE < LinuxVersionCode(2,1,0)
+
 static int md_open (struct inode *inode, struct file *file)
 {
-  int minor=MINOR(inode->i_rdev);
+       /*
+        * Always succeed
+        */
+       return (0);
+}
+
+static void md_release (struct inode *inode, struct file *file)
+{
+       sync_dev(inode->i_rdev);
+}
+
+
+static int md_read (struct inode *inode, struct file *file,
+                                               char *buf, int count)
+{
+       mddev_t *mddev = kdev_to_mddev(MD_FILE_TO_INODE(file)->i_rdev);
 
-  md_dev[minor].busy++;
-  return (0);                  /* Always succeed */
+       if (!mddev || !mddev->pers)
+               return -ENXIO;
+
+       return block_read (inode, file, buf, count);
 }
 
+static int md_write (struct inode *inode, struct file *file,
+                                               const char *buf, int count)
+{
+       mddev_t *mddev = kdev_to_mddev(MD_FILE_TO_INODE(file)->i_rdev);
+
+       if (!mddev || !mddev->pers)
+               return -ENXIO;
 
-static int md_release (struct inode *inode, struct file *file)
+       return block_write (inode, file, buf, count);
+}
+
+static struct file_operations md_fops=
 {
-  int minor=MINOR(inode->i_rdev);
+       NULL,
+       md_read,
+       md_write,
+       NULL,
+       NULL,
+       md_ioctl,
+       NULL,
+       md_open,
+       md_release,
+       block_fsync
+};
+
+#else
 
-  sync_dev (inode->i_rdev);
-  md_dev[minor].busy--;
-  return 0;
+static int md_open (struct inode *inode, struct file *file)
+{
+       /*
+        * Always succeed
+        */
+       return (0);
 }
 
+static int md_release (struct inode *inode, struct file *file)
+{
+       sync_dev(inode->i_rdev);
+       return 0;
+}
 
 static ssize_t md_read (struct file *file, char *buf, size_t count,
                        loff_t *ppos)
 {
-  int minor=MINOR(file->f_dentry->d_inode->i_rdev);
+       mddev_t *mddev = kdev_to_mddev(MD_FILE_TO_INODE(file)->i_rdev);
 
-  if (!md_dev[minor].pers)     /* Check if device is being run */
-    return -ENXIO;
+       if (!mddev || !mddev->pers)
+               return -ENXIO;
 
-  return block_read(file, buf, count, ppos);
+       return block_read(file, buf, count, ppos);
 }
 
 static ssize_t md_write (struct file *file, const char *buf,
                         size_t count, loff_t *ppos)
 {
-  int minor=MINOR(file->f_dentry->d_inode->i_rdev);
+       mddev_t *mddev = kdev_to_mddev(MD_FILE_TO_INODE(file)->i_rdev);
 
-  if (!md_dev[minor].pers)     /* Check if device is being run */
-    return -ENXIO;
+       if (!mddev || !mddev->pers)
+               return -ENXIO;
 
-  return block_write(file, buf, count, ppos);
+       return block_write(file, buf, count, ppos);
 }
 
 static struct file_operations md_fops=
 {
-  NULL,
-  md_read,
-  md_write,
-  NULL,
-  NULL,
-  md_ioctl,
-  NULL,
-  md_open,
-  NULL,
-  md_release,
-  block_fsync
+       NULL,
+       md_read,
+       md_write,
+       NULL,
+       NULL,
+       md_ioctl,
+       NULL,
+       md_open,
+       NULL,
+       md_release,
+       block_fsync
 };
 
-int md_map (int minor, kdev_t *rdev, unsigned long *rsector, unsigned long size)
+#endif
+
+int md_map (kdev_t dev, kdev_t *rdev,
+                        unsigned long *rsector, unsigned long size)
 {
-  if ((unsigned int) minor >= MAX_MD_DEV)
-  {
-    printk ("Bad md device %d\n", minor);
-    return (-1);
-  }
-  
-  if (!md_dev[minor].pers)
-  {
-    printk ("Oops ! md%d not running, giving up !\n", minor);
-    return (-1);
-  }
+       int err;
+       mddev_t *mddev = kdev_to_mddev(dev);
 
-  return (md_dev[minor].pers->map(md_dev+minor, rdev, rsector, size));
+       if (!mddev || !mddev->pers) {
+               err = -ENXIO;
+               goto out;
+       }
+
+       err = mddev->pers->map(mddev, dev, rdev, rsector, size);
+out:
+       return err;
 }
   
-int md_make_request (int minor, int rw, struct buffer_head * bh)
+int md_make_request (struct buffer_head * bh, int rw)
 {
-       if (md_dev [minor].pers->make_request) {
-               if (buffer_locked(bh))
-                       return 0;
+       int err;
+       mddev_t *mddev = kdev_to_mddev(bh->b_dev);
+
+       if (!mddev || !mddev->pers) {
+               err = -ENXIO;
+               goto out;
+       }
+
+       if (mddev->pers->make_request) {
+               if (buffer_locked(bh)) {
+                       err = 0;
+                       goto out;
+               }
                set_bit(BH_Lock, &bh->b_state);
                if (rw == WRITE || rw == WRITEA) {
                        if (!buffer_dirty(bh)) {
-                               bh->b_end_io(bh, test_bit(BH_Uptodate, &bh->b_state));
-                               return 0;
+                               bh->b_end_io(bh, buffer_uptodate(bh));
+                               err = 0;
+                               goto out;
                        }
                }
                if (rw == READ || rw == READA) {
                        if (buffer_uptodate(bh)) {
-                               bh->b_end_io(bh, test_bit(BH_Uptodate, &bh->b_state));
-                               return 0;
+                               bh->b_end_io(bh, buffer_uptodate(bh));
+                               err = 0;
+                               goto out;
                        }
                }
-               return (md_dev[minor].pers->make_request(md_dev+minor, rw, bh));
+               err = mddev->pers->make_request(mddev, rw, bh);
        } else {
                make_request (MAJOR(bh->b_rdev), rw, bh);
-               return 0;
+               err = 0;
        }
+out:
+       return err;
 }
 
 static void do_md_request (void)
 {
-  printk ("Got md request, not good...");
-  return;
+       printk(KERN_ALERT "Got md request, not good...");
+       return;
+}
+
+int md_thread(void * arg)
+{
+       mdk_thread_t *thread = arg;
+
+       md_lock_kernel();
+       exit_mm(current);
+       exit_files(current);
+       exit_fs(current);
+
+       /*
+        * Detach thread
+        */
+       sys_setsid();
+       sprintf(current->comm, thread->name);
+       md_init_signals();
+       md_flush_signals();
+       thread->tsk = current;
+
+       /*
+        * md_thread is a 'system-thread', it's priority should be very
+        * high. We avoid resource deadlocks individually in each
+        * raid personality. (RAID5 does preallocation) We also use RR and
+        * the very same RT priority as kswapd, thus we will never get
+        * into a priority inversion deadlock.
+        *
+        * we definitely have to have equal or higher priority than
+        * bdflush, otherwise bdflush will deadlock if there are too
+        * many dirty RAID5 blocks.
+        */
+       current->policy = SCHED_OTHER;
+       current->priority = 40;
+
+       up(thread->sem);
+
+       for (;;) {
+               cli();
+               if (!test_bit(THREAD_WAKEUP, &thread->flags)) {
+                       if (!thread->run)
+                               break;
+                       interruptible_sleep_on(&thread->wqueue);
+               }
+               sti();
+               clear_bit(THREAD_WAKEUP, &thread->flags);
+               if (thread->run) {
+                       thread->run(thread->data);
+                       run_task_queue(&tq_disk);
+               }
+               if (md_signal_pending(current)) {
+                       printk("%8s(%d) flushing signals.\n", current->comm,
+                               current->pid);
+                       md_flush_signals();
+               }
+       }
+       sti();
+       up(thread->sem);
+       return 0;
 }
 
-void md_wakeup_thread(struct md_thread *thread)
+void md_wakeup_thread(mdk_thread_t *thread)
 {
        set_bit(THREAD_WAKEUP, &thread->flags);
        wake_up(&thread->wqueue);
 }
 
-struct md_thread *md_register_thread (void (*run) (void *), void *data)
+mdk_thread_t *md_register_thread (void (*run) (void *),
+                                               void *data, const char *name)
 {
-       struct md_thread *thread = (struct md_thread *)
-               kmalloc(sizeof(struct md_thread), GFP_KERNEL);
+       mdk_thread_t *thread;
        int ret;
        struct semaphore sem = MUTEX_LOCKED;
        
-       if (!thread) return NULL;
+       thread = (mdk_thread_t *) kmalloc
+                               (sizeof(mdk_thread_t), GFP_KERNEL);
+       if (!thread)
+               return NULL;
        
-       memset(thread, 0, sizeof(struct md_thread));
+       memset(thread, 0, sizeof(mdk_thread_t));
        init_waitqueue(&thread->wqueue);
        
        thread->sem = &sem;
        thread->run = run;
        thread->data = data;
+       thread->name = name;
        ret = kernel_thread(md_thread, thread, 0);
        if (ret < 0) {
                kfree(thread);
@@ -836,270 +3032,407 @@
        return thread;
 }
 
-void md_unregister_thread (struct md_thread *thread)
+void md_interrupt_thread (mdk_thread_t *thread)
+{
+       if (!thread->tsk) {
+               MD_BUG();
+               return;
+       }
+       printk("interrupting MD-thread pid %d\n", thread->tsk->pid);
+       send_sig(SIGKILL, thread->tsk, 1);
+}
+
+void md_unregister_thread (mdk_thread_t *thread)
 {
        struct semaphore sem = MUTEX_LOCKED;
        
        thread->sem = &sem;
        thread->run = NULL;
-       if (thread->tsk)
-               printk("Killing md_thread %d %p %s\n",
-                      thread->tsk->pid, thread->tsk, thread->tsk->comm);
-       else
-               printk("Aiee. md_thread has 0 tsk\n");
-       send_sig(SIGKILL, thread->tsk, 1);
-       printk("downing on %p\n", &sem);
+       thread->name = NULL;
+       if (!thread->tsk) {
+               MD_BUG();
+               return;
+       }
+       md_interrupt_thread(thread);
        down(&sem);
 }
 
-#define SHUTDOWN_SIGS   (sigmask(SIGKILL)|sigmask(SIGINT)|sigmask(SIGTERM))
-
-int md_thread(void * arg)
+void md_recover_arrays (void)
 {
-       struct md_thread *thread = arg;
-
-       lock_kernel();
-       exit_mm(current);
-       exit_files(current);
-       exit_fs(current);
-       
-       current->session = 1;
-       current->pgrp = 1;
-       sprintf(current->comm, "md_thread");
-       siginitsetinv(&current->blocked, SHUTDOWN_SIGS);
-       thread->tsk = current;
-       up(thread->sem);
-
-       for (;;) {
-               cli();
-               if (!test_bit(THREAD_WAKEUP, &thread->flags)) {
-                       do {
-                               spin_lock(&current->sigmask_lock);
-                               flush_signals(current);
-                               spin_unlock(&current->sigmask_lock);
-                               interruptible_sleep_on(&thread->wqueue);
-                               cli();
-                               if (test_bit(THREAD_WAKEUP, &thread->flags))
-                                       break;
-                               if (!thread->run) {
-                                       sti();
-                                       up(thread->sem);
-                                       return 0;
-                               }
-                       } while (signal_pending(current));
-               }
-               sti();
-               clear_bit(THREAD_WAKEUP, &thread->flags);
-               if (thread->run) {
-                       thread->run(thread->data);
-                       run_task_queue(&tq_disk);
-               }
+       if (!md_recovery_thread) {
+               MD_BUG();
+               return;
        }
+       md_wakeup_thread(md_recovery_thread);
 }
 
-EXPORT_SYMBOL(md_size);
-EXPORT_SYMBOL(md_maxreadahead);
-EXPORT_SYMBOL(register_md_personality);
-EXPORT_SYMBOL(unregister_md_personality);
-EXPORT_SYMBOL(partition_name);
-EXPORT_SYMBOL(md_dev);
-EXPORT_SYMBOL(md_error);
-EXPORT_SYMBOL(md_register_thread);
-EXPORT_SYMBOL(md_unregister_thread);
-EXPORT_SYMBOL(md_update_sb);
-EXPORT_SYMBOL(md_map);
-EXPORT_SYMBOL(md_wakeup_thread);
-EXPORT_SYMBOL(md_do_sync);
 
-#ifdef CONFIG_PROC_FS
-static struct proc_dir_entry proc_md = {
-       PROC_MD, 6, "mdstat",
-       S_IFREG | S_IRUGO, 1, 0, 0,
-       0, &proc_array_inode_operations,
-};
+int md_error (kdev_t dev, kdev_t rdev)
+{
+       mddev_t *mddev = kdev_to_mddev(dev);
+       mdk_rdev_t * rrdev;
+       int rc;
+
+       if (!mddev) {
+               MD_BUG();
+               return 0;
+       }
+       rrdev = find_rdev(mddev, rdev);
+       mark_rdev_faulty(rrdev);
+       /*
+        * if recovery was running, stop it now.
+        */
+       if (mddev->pers->stop_resync)
+               mddev->pers->stop_resync(mddev);
+       if (mddev->recovery_running)
+               md_interrupt_thread(md_recovery_thread);
+       if (mddev->pers->error_handler) {
+               rc = mddev->pers->error_handler(mddev, rdev);
+               md_recover_arrays();
+               return rc;
+       }
+#if 0
+       /*
+        * Drop all buffers in the failed array.
+        * _not_. This is called from IRQ handlers ...
+        */
+       invalidate_buffers(rdev);
 #endif
+       return 0;
+}
 
-static void md_geninit (struct gendisk *gdisk)
+static int status_unused (char * page)
 {
-  int i;
-  
-  for(i=0;i<MAX_MD_DEV;i++)
-  {
-    md_blocksizes[i] = 1024;
-    md_maxreadahead[i] = MD_DEFAULT_DISK_READAHEAD;
-    md_gendisk.part[i].start_sect=-1; /* avoid partition check */
-    md_gendisk.part[i].nr_sects=0;
-    md_dev[i].pers=NULL;
-  }
+       int sz = 0, i = 0;
+       mdk_rdev_t *rdev;
+       struct md_list_head *tmp;
 
-  blksize_size[MD_MAJOR] = md_blocksizes;
-  max_readahead[MD_MAJOR] = md_maxreadahead;
+       sz += sprintf(page + sz, "unused devices: ");
 
-#ifdef CONFIG_PROC_FS
-  proc_register(&proc_root, &proc_md);
-#endif
+       ITERATE_RDEV_ALL(rdev,tmp) {
+               if (!rdev->same_set.next && !rdev->same_set.prev) {
+                       /*
+                        * The device is not yet used by any array.
+                        */
+                       i++;
+                       sz += sprintf(page + sz, "%s ",
+                               partition_name(rdev->dev));
+               }
+       }
+       if (!i)
+               sz += sprintf(page + sz, "<none>");
+
+       sz += sprintf(page + sz, "\n");
+       return sz;
 }
 
-int md_error (kdev_t mddev, kdev_t rdev)
+
+static int status_resync (char * page, mddev_t * mddev)
 {
-    unsigned int minor = MINOR (mddev);
-    int rc;
+       int sz = 0;
+       unsigned int blocksize, max_blocks, resync, res, dt, tt, et;
 
-    if (MAJOR(mddev) != MD_MAJOR || minor > MAX_MD_DEV)
-       panic ("md_error gets unknown device\n");
-    if (!md_dev [minor].pers)
-       panic ("md_error gets an error for an unknown device\n");
-    if (md_dev [minor].pers->error_handler) {
-       rc = md_dev [minor].pers->error_handler (md_dev+minor, rdev);
-#if SUPPORT_RECONSTRUCTION
-       md_wakeup_thread(md_sync_thread);
-#endif /* SUPPORT_RECONSTRUCTION */
-       return rc;
-    }
-    return 0;
+       resync = mddev->curr_resync;
+       blocksize = blksize_size[MD_MAJOR][mdidx(mddev)];
+       max_blocks = blk_size[MD_MAJOR][mdidx(mddev)] / (blocksize >> 10);
+
+       /*
+        * Should not happen.
+        */             
+       if (!max_blocks) {
+               MD_BUG();
+               return 0;
+       }
+       res = resync*100/max_blocks;
+       if (!mddev->recovery_running)
+               /*
+                * true resync
+                */
+               sz += sprintf(page + sz, " resync=%u%%", res);
+       else
+               /*
+                * recovery ...
+                */
+               sz += sprintf(page + sz, " recovery=%u%%", res);
+
+       /*
+        * We do not want to overflow, so the order of operands and
+        * the * 100 / 100 trick are important. We do a +1 to be
+        * safe against division by zero. We only estimate anyway.
+        *
+        * dt: time until now
+        * tt: total time
+        * et: estimated finish time
+        */
+       dt = ((jiffies - mddev->resync_start) / HZ);
+       tt = (dt * (max_blocks / (resync/100+1)))/100;
+       if (tt > dt)
+               et = tt - dt;
+       else
+               /*
+                * ignore rounding effects near finish time
+                */
+               et = 0;
+       
+       sz += sprintf(page + sz, " finish=%u.%umin", et / 60, (et % 60)/6);
+
+       return sz;
 }
 
 int get_md_status (char *page)
 {
-  int sz=0, i, j, size;
-
-  sz+=sprintf( page+sz, "Personalities : ");
-  for (i=0; i<MAX_PERSONALITY; i++)
-    if (pers[i])
-      sz+=sprintf (page+sz, "[%d %s] ", i, pers[i]->name);
-
-  page[sz-1]='\n';
-
-  sz+=sprintf (page+sz, "read_ahead ");
-  if (read_ahead[MD_MAJOR]==INT_MAX)
-    sz+=sprintf (page+sz, "not set\n");
-  else
-    sz+=sprintf (page+sz, "%d sectors\n", read_ahead[MD_MAJOR]);
+       int sz = 0, j, size;
+       struct md_list_head *tmp, *tmp2;
+       mdk_rdev_t *rdev;
+       mddev_t *mddev;
+
+       sz += sprintf(page + sz, "Personalities : ");
+       for (j = 0; j < MAX_PERSONALITY; j++)
+       if (pers[j])
+               sz += sprintf(page+sz, "[%s] ", pers[j]->name);
+
+       sz += sprintf(page+sz, "\n");
+
+
+       sz += sprintf(page+sz, "read_ahead ");
+       if (read_ahead[MD_MAJOR] == INT_MAX)
+               sz += sprintf(page+sz, "not set\n");
+       else
+               sz += sprintf(page+sz, "%d sectors\n", read_ahead[MD_MAJOR]);
   
-  for (i=0; i<MAX_MD_DEV; i++)
-  {
-    sz+=sprintf (page+sz, "md%d : %sactive", i, md_dev[i].pers ? "" : "in");
-
-    if (md_dev[i].pers)
-      sz+=sprintf (page+sz, " %s", md_dev[i].pers->name);
+       ITERATE_MDDEV(mddev,tmp) {
+               sz += sprintf(page + sz, "md%d : %sactive", mdidx(mddev),
+                                               mddev->pers ? "" : "in");
+               if (mddev->pers) {
+                       if (mddev->ro)  
+                               sz += sprintf(page + sz, " (read-only)");
+                       sz += sprintf(page + sz, " %s", mddev->pers->name);
+               }
 
-    size=0;
-    for (j=0; j<md_dev[i].nb_dev; j++)
-    {
-      sz+=sprintf (page+sz, " %s",
-                  partition_name(md_dev[i].devices[j].dev));
-      size+=md_dev[i].devices[j].size;
-    }
+               size = 0;
+               ITERATE_RDEV(mddev,rdev,tmp2) {
+                       sz += sprintf(page + sz, " %s[%d]",
+                               partition_name(rdev->dev), rdev->desc_nr);
+                       if (rdev->faulty) {
+                               sz += sprintf(page + sz, "(F)");
+                               continue;
+                       }
+                       size += rdev->size;
+               }
 
-    if (md_dev[i].nb_dev) {
-      if (md_dev[i].pers)
-        sz+=sprintf (page+sz, " %d blocks", md_size[i]);
-      else
-        sz+=sprintf (page+sz, " %d blocks", size);
-    }
+               if (mddev->nb_dev) {
+                       if (mddev->pers)
+                               sz += sprintf(page + sz, " %d blocks",
+                                                md_size[mdidx(mddev)]);
+                       else
+                               sz += sprintf(page + sz, " %d blocks", size);
+               }
 
-    if (!md_dev[i].pers)
-    {
-      sz+=sprintf (page+sz, "\n");
-      continue;
-    }
+               if (!mddev->pers) {
+                       sz += sprintf(page+sz, "\n");
+                       continue;
+               }
 
-    if (md_dev[i].pers->max_invalid_dev)
-      sz+=sprintf (page+sz, " maxfault=%ld", MAX_FAULT(md_dev+i));
+               sz += mddev->pers->status (page+sz, mddev);
 
-    sz+=md_dev[i].pers->status (page+sz, i, md_dev+i);
-    sz+=sprintf (page+sz, "\n");
-  }
+               if (mddev->curr_resync)
+                       sz += status_resync (page+sz, mddev);
+               else {
+                       if (md_atomic_read(&mddev->resync_sem.count) != 1)
+                               sz += sprintf(page + sz, " resync=DELAYED");
+               }
+               sz += sprintf(page + sz, "\n");
+       }
+       sz += status_unused (page + sz);
 
-  return (sz);
+       return (sz);
 }
 
-int register_md_personality (int p_num, struct md_personality *p)
+int register_md_personality (int pnum, mdk_personality_t *p)
 {
-  int i=(p_num >> PERSONALITY_SHIFT);
-
-  if (i >= MAX_PERSONALITY)
-    return -EINVAL;
+       if (pnum >= MAX_PERSONALITY)
+               return -EINVAL;
 
-  if (pers[i])
-    return -EBUSY;
+       if (pers[pnum])
+               return -EBUSY;
   
-  pers[i]=p;
-  printk ("%s personality registered\n", p->name);
-  return 0;
+       pers[pnum] = p;
+       printk(KERN_INFO "%s personality registered\n", p->name);
+       return 0;
 }
 
-int unregister_md_personality (int p_num)
+int unregister_md_personality (int pnum)
 {
-  int i=(p_num >> PERSONALITY_SHIFT);
-
-  if (i >= MAX_PERSONALITY)
-    return -EINVAL;
+       if (pnum >= MAX_PERSONALITY)
+               return -EINVAL;
 
-  printk ("%s personality unregistered\n", pers[i]->name);
-  pers[i]=NULL;
-  return 0;
+       printk(KERN_INFO "%s personality unregistered\n", pers[pnum]->name);
+       pers[pnum] = NULL;
+       return 0;
 } 
 
-static md_descriptor_t *get_spare(struct md_dev *mddev)
+static mdp_disk_t *get_spare(mddev_t *mddev)
 {
-       int i;
-       md_superblock_t *sb = mddev->sb;
-       md_descriptor_t *descriptor;
-       struct real_dev *realdev;
-       
-       for (i = 0; i < mddev->nb_dev; i++) {
-               realdev = &mddev->devices[i];
-               if (!realdev->sb)
+       mdp_super_t *sb = mddev->sb;
+       mdp_disk_t *disk;
+       mdk_rdev_t *rdev;
+       struct md_list_head *tmp;
+
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (rdev->faulty)
+                       continue;
+               if (!rdev->sb) {
+                       MD_BUG();
                        continue;
-               descriptor = &sb->disks[realdev->sb->descriptor.number];
-               if (descriptor->state & (1 << MD_FAULTY_DEVICE))
+               }
+               disk = &sb->disks[rdev->desc_nr];
+               if (disk_faulty(disk)) {
+                       MD_BUG();
                        continue;
-               if (descriptor->state & (1 << MD_ACTIVE_DEVICE))
+               }
+               if (disk_active(disk))
                        continue;
-               return descriptor;
+               return disk;
        }
        return NULL;
 }
 
+static int is_mddev_idle (mddev_t *mddev)
+{
+       mdk_rdev_t * rdev;
+       struct md_list_head *tmp;
+       int idle;
+       unsigned long curr_events;
+
+       idle = 1;
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               curr_events = io_events[MAJOR(rdev->dev)];
+
+               if (curr_events != rdev->last_events) {
+//                     printk("!I(%d)", curr_events-rdev->last_events);
+                       rdev->last_events = curr_events;
+                       idle = 0;
+               }
+       }
+       return idle;
+}
+
 /*
  * parallel resyncing thread. 
- *
- * FIXME: - make it abort with a dirty array on mdstop, now it just blocks
- *        - fix read error handing
  */
 
-int md_do_sync(struct md_dev *mddev)
+/*
+ * Determine correct block size for this device.
+ */
+unsigned int device_bsize (kdev_t dev)
+{
+       unsigned int i, correct_size;
+
+       correct_size = BLOCK_SIZE;
+       if (blksize_size[MAJOR(dev)]) {
+               i = blksize_size[MAJOR(dev)][MINOR(dev)];
+               if (i)
+                       correct_size = i;
+       }
+
+       return correct_size;
+}
+
+static struct wait_queue *resync_wait = (struct wait_queue *)NULL;
+
+#define RA_ORDER (1)
+#define RA_PAGE_SIZE (PAGE_SIZE*(1<<RA_ORDER))
+#define MAX_NR_BLOCKS (RA_PAGE_SIZE/sizeof(struct buffer_head *))
+
+int md_do_sync(mddev_t *mddev, mdp_disk_t *spare)
 {
-        struct buffer_head *bh;
-       int max_blocks, blocksize, curr_bsize, percent=1, j;
-       kdev_t read_disk = MKDEV(MD_MAJOR, mddev - md_dev);
+       mddev_t *mddev2;
+        struct buffer_head **bh;
+       unsigned int max_blocks, blocksize, curr_bsize,
+               i, ii, j, k, chunk, window, nr_blocks, err, serialize;
+       kdev_t read_disk = mddev_to_kdev(mddev);
        int major = MAJOR(read_disk), minor = MINOR(read_disk);
        unsigned long starttime;
+       int max_read_errors = 2*MAX_NR_BLOCKS,
+                max_write_errors = 2*MAX_NR_BLOCKS;
+       struct md_list_head *tmp;
+
+retry_alloc:
+       bh = (struct buffer_head **) md__get_free_pages(GFP_KERNEL, RA_ORDER);
+       if (!bh) {
+               printk(KERN_ERR
+               "could not alloc bh array for reconstruction ... retrying!\n");
+               goto retry_alloc;
+       }
+
+       err = down_interruptible(&mddev->resync_sem);
+       if (err)
+               goto out_nolock;
+
+recheck:
+       serialize = 0;
+       ITERATE_MDDEV(mddev2,tmp) {
+               if (mddev2 == mddev)
+                       continue;
+               if (mddev2->curr_resync && match_mddev_units(mddev,mddev2)) {
+                       printk(KERN_INFO "md: serializing resync, md%d has overlapping physical units with md%d!\n", mdidx(mddev), mdidx(mddev2));
+                       serialize = 1;
+                       break;
+               }
+       }
+       if (serialize) {
+               interruptible_sleep_on(&resync_wait);
+               if (md_signal_pending(current)) {
+                       md_flush_signals();
+                       err = -EINTR;
+                       goto out;
+               }
+               goto recheck;
+       }
+
+       mddev->curr_resync = 1;
 
-       blocksize = blksize_size[major][minor];
+       blocksize = device_bsize(read_disk);
        max_blocks = blk_size[major][minor] / (blocksize >> 10);
 
-       printk("... resync log\n");
-       printk(" ....   mddev->nb_dev: %d\n", mddev->nb_dev);
-       printk(" ....   raid array: %s\n", kdevname(read_disk));
-       printk(" ....   max_blocks: %d blocksize: %d\n", max_blocks, blocksize);
-       printk("md: syncing RAID array %s\n", kdevname(read_disk));
+       printk(KERN_INFO "md: syncing RAID array md%d\n", mdidx(mddev));
+       printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed: %d KB/sec.\n",
+                                               sysctl_speed_limit);
+       printk(KERN_INFO "md: using maximum available idle IO bandwith for reconstruction.\n");
+
+       /*
+        * Resync has low priority.
+        */
+       current->priority = 1;
+
+       is_mddev_idle(mddev); /* this also initializes IO event counters */
+       starttime = jiffies;
+       mddev->resync_start = starttime;
 
-       mddev->busy++;
+       /*
+        * Tune reconstruction:
+        */
+       window = md_maxreadahead[mdidx(mddev)]/1024;
+       nr_blocks = window / (blocksize >> 10);
+       if (!nr_blocks || (nr_blocks > MAX_NR_BLOCKS))
+               nr_blocks = MAX_NR_BLOCKS;
+       printk(KERN_INFO "md: using %dk window.\n",window);
 
-       starttime=jiffies;
-       for (j = 0; j < max_blocks; j++) {
+       for (j = 0; j < max_blocks; j += nr_blocks) {
 
+               if (j)
+                       mddev->curr_resync = j;
                /*
                 * B careful. When some1 mounts a non-'blocksize' filesystem
                 * then we get the blocksize changed right under us. Go deal
                 * with it transparently, recalculate 'blocksize', 'j' and
                 * 'max_blocks':
                 */
-               curr_bsize = blksize_size[major][minor];
+               curr_bsize = device_bsize(read_disk);
                if (curr_bsize != blocksize) {
-               diff_blocksize:
+                       printk(KERN_INFO "md%d: blocksize changed\n",
+                                                               mdidx(mddev));
+retry_read:
                        if (curr_bsize > blocksize)
                                /*
                                 * this is safe, rounds downwards.
@@ -1109,114 +3442,384 @@
                                j *= blocksize/curr_bsize;
 
                        blocksize = curr_bsize;
+                       nr_blocks = window / (blocksize >> 10);
+                       if (!nr_blocks || (nr_blocks > MAX_NR_BLOCKS))
+                               nr_blocks = MAX_NR_BLOCKS;
                        max_blocks = blk_size[major][minor] / (blocksize >> 10);
-               }
-               if ((bh = breada (read_disk, j, blocksize, j * blocksize,
-                                       max_blocks * blocksize)) != NULL) {
-                       mark_buffer_dirty(bh, 1);
-                       brelse(bh);
-               } else {
+                       printk("nr_blocks changed to %d (blocksize %d, j %d, max_blocks %d)\n",
+                                       nr_blocks, blocksize, j, max_blocks);
                        /*
-                        * FIXME: Ugly, but set_blocksize() isnt safe ...
+                        * We will retry the current block-group
                         */
-                       curr_bsize = blksize_size[major][minor];
-                       if (curr_bsize != blocksize)
-                               goto diff_blocksize;
+               }
 
-                       /*
-                        * It's a real read problem. FIXME, handle this
-                        * a better way.
-                        */
-                       printk ( KERN_ALERT
-                                "read error, stopping reconstruction.\n");
-                       mddev->busy--;
-                       return 1;
+               /*
+                * Cleanup routines expect this
+                */
+               for (k = 0; k < nr_blocks; k++)
+                       bh[k] = NULL;
+
+               chunk = nr_blocks;
+               if (chunk > max_blocks-j)
+                       chunk = max_blocks-j;
+
+               /*
+                * request buffer heads ...
+                */
+               for (i = 0; i < chunk; i++) {
+                       bh[i] = getblk (read_disk, j+i, blocksize);
+                       if (!bh[i])
+                               goto read_error;
+                       if (!buffer_dirty(bh[i]))
+                               mark_buffer_lowprio(bh[i]);
                }
 
                /*
-                * Let's sleep some if we are faster than our speed limit:
+                * read buffer heads ...
                 */
-               while (blocksize*j/(jiffies-starttime+1)*HZ/1024 > SPEED_LIMIT)
-               {
-                       current->state = TASK_INTERRUPTIBLE;
-                       schedule_timeout(1);
+               ll_rw_block (READ, chunk, bh);
+               run_task_queue(&tq_disk);
+               
+               /*
+                * verify that all of them are OK ...
+                */
+               for (i = 0; i < chunk; i++) {
+                       ii = chunk-i-1;
+                       wait_on_buffer(bh[ii]);
+                       if (!buffer_uptodate(bh[ii]))
+                               goto read_error;
+               }
+
+retry_write:
+               for (i = 0; i < chunk; i++)
+                       mark_buffer_dirty_lowprio(bh[i]);
+
+               ll_rw_block(WRITE, chunk, bh);
+               run_task_queue(&tq_disk);
+
+               for (i = 0; i < chunk; i++) {
+                       ii = chunk-i-1;
+                       wait_on_buffer(bh[ii]);
+
+                       if (spare && disk_faulty(spare)) {
+                               for (k = 0; k < chunk; k++)
+                                       brelse(bh[k]);
+                               printk(" <SPARE FAILED!>\n ");
+                               err = -EIO;
+                               goto out;
+                       }
+
+                       if (!buffer_uptodate(bh[ii])) {
+                               curr_bsize = device_bsize(read_disk);
+                               if (curr_bsize != blocksize) {
+                                       printk(KERN_INFO
+                                               "md%d: blocksize changed during write\n",
+                                               mdidx(mddev));
+                                       for (k = 0; k < chunk; k++)
+                                               if (bh[k]) {
+                                                       if (buffer_lowprio(bh[k]))
+                                                               mark_buffer_clean(bh[k]);
+                                                       brelse(bh[k]);
+                                               }
+                                       goto retry_read;
+                               }
+                               printk(" BAD WRITE %8d>\n", j);
+                               /*
+                                * Ouch, write error, retry or bail out.
+                                */
+                               if (max_write_errors) {
+                                       max_write_errors--;
+                                       printk ( KERN_WARNING "md%d: write error while reconstructing, at block %u(%d).\n", mdidx(mddev), j, blocksize);
+                                       goto retry_write;
+                               }
+                               printk ( KERN_ALERT
+                                 "too many write errors, stopping reconstruction.\n");
+                               for (k = 0; k < chunk; k++)
+                                       if (bh[k]) {
+                                               if (buffer_lowprio(bh[k]))
+                                                       mark_buffer_clean(bh[k]);
+                                               brelse(bh[k]);
+                                       }
+                               err = -EIO;
+                               goto out;
+                       }
                }
 
                /*
-                * FIXME: put this status bar thing into /proc
+                * This is the normal 'everything went OK' case
+                * do a 'free-behind' logic, we sure dont need
+                * this buffer if it was the only user.
                 */
-               if (!(j%(max_blocks/100))) {
-                       if (!(percent%10))
-                               printk (" %03d%% done.\n",percent);
+               for (i = 0; i < chunk; i++)
+                       if (buffer_dirty(bh[i]))
+                               brelse(bh[i]);
                        else
-                               printk (".");
-                       percent++;
+                               bforget(bh[i]);
+
+
+               if (md_signal_pending(current)) {
+                       /*
+                        * got a signal, exit.
+                        */
+                       mddev->curr_resync = 0;
+                       printk("md_do_sync() got signal ... exiting\n");
+                       md_flush_signals();
+                       err = -EINTR;
+                       goto out;
                }
+
+               /*
+                * this loop exits only if either when we are slower than
+                * the 'hard' speed limit, or the system was IO-idle for
+                * a jiffy.
+                * the system might be non-idle CPU-wise, but we only care
+                * about not overloading the IO subsystem. (things like an
+                * e2fsck being done on the RAID array should execute fast)
+                */
+repeat:
+               if (md_need_resched(current))
+                       schedule();
+
+               if ((blocksize/1024)*j/((jiffies-starttime)/HZ + 1) + 1
+                                               > sysctl_speed_limit) {
+                       current->priority = 1;
+
+                       if (!is_mddev_idle(mddev)) {
+                               current->state = TASK_INTERRUPTIBLE;
+                               md_schedule_timeout(HZ/2);
+                               if (!md_signal_pending(current))
+                                       goto repeat;
+                       }
+               } else
+                       current->priority = 40;
        }
        fsync_dev(read_disk);
-       printk("md: %s: sync done.\n", kdevname(read_disk));
-       mddev->busy--;
-       return 0;
+       printk(KERN_INFO "md: md%d: sync done.\n",mdidx(mddev));
+       err = 0;
+       /*
+        * this also signals 'finished resyncing' to md_stop
+        */
+out:
+       up(&mddev->resync_sem);
+out_nolock:
+       free_pages((unsigned long)bh, RA_ORDER);
+       mddev->curr_resync = 0;
+       wake_up(&resync_wait);
+       return err;
+
+read_error:
+       /*
+        * set_blocksize() might change the blocksize. This
+        * should not happen often, but it happens when eg.
+        * someone mounts a filesystem that has non-1k
+        * blocksize. set_blocksize() doesnt touch our
+        * buffer, but to avoid aliasing problems we change
+        * our internal blocksize too and retry the read.
+        */
+       curr_bsize = device_bsize(read_disk);
+       if (curr_bsize != blocksize) {
+               printk(KERN_INFO "md%d: blocksize changed during read\n",
+                       mdidx(mddev));
+               for (k = 0; k < chunk; k++)
+                       if (bh[k]) {
+                               if (buffer_lowprio(bh[k]))
+                                       mark_buffer_clean(bh[k]);
+                               brelse(bh[k]);
+                       }
+               goto retry_read;
+       }
+
+       /*
+        * It's a real read problem. We retry and bail out
+        * only if it's excessive.
+        */
+       if (max_read_errors) {
+               max_read_errors--;
+               printk ( KERN_WARNING "md%d: read error while reconstructing, at block %u(%d).\n", mdidx(mddev), j, blocksize);
+               for (k = 0; k < chunk; k++)
+                       if (bh[k]) {
+                               if (buffer_lowprio(bh[k]))
+                                       mark_buffer_clean(bh[k]);
+                               brelse(bh[k]);
+                       }
+               goto retry_read;
+       }
+       printk ( KERN_ALERT "too many read errors, stopping reconstruction.\n");
+       for (k = 0; k < chunk; k++)
+               if (bh[k]) {
+                       if (buffer_lowprio(bh[k]))
+                               mark_buffer_clean(bh[k]);
+                       brelse(bh[k]);
+               }
+       err = -EIO;
+       goto out;
 }
 
+#undef MAX_NR_BLOCKS
+
 /*
- * This is a kernel thread which: syncs a spare disk with the active array
+ * This is a kernel thread which syncs a spare disk with the active array
  *
  * the amount of foolproofing might seem to be a tad excessive, but an
  * early (not so error-safe) version of raid1syncd synced the first 0.5 gigs
  * of my root partition with the first 0.5 gigs of my /home partition ... so
  * i'm a bit nervous ;)
  */
-void mdsyncd (void *data)
+void md_do_recovery (void *data)
 {
-       int i;
-       struct md_dev *mddev;
-       md_superblock_t *sb;
-       md_descriptor_t *spare;
+       int err;
+       mddev_t *mddev;
+       mdp_super_t *sb;
+       mdp_disk_t *spare;
        unsigned long flags;
+       struct md_list_head *tmp;
 
-       for (i = 0, mddev = md_dev; i < MAX_MD_DEV; i++, mddev++) {
-               if ((sb = mddev->sb) == NULL)
+       printk(KERN_INFO "md: recovery thread got woken up ...\n");
+restart:
+       ITERATE_MDDEV(mddev,tmp) {
+               sb = mddev->sb;
+               if (!sb)
+                       continue;
+               if (mddev->recovery_running)
                        continue;
                if (sb->active_disks == sb->raid_disks)
                        continue;
-               if (!sb->spare_disks)
+               if (!sb->spare_disks) {
+                       printk(KERN_ERR "md%d: no spare disk to reconstruct array! -- continuing in degraded mode\n", mdidx(mddev));
                        continue;
+               }
+               /*
+                * now here we get the spare and resync it.
+                */
                if ((spare = get_spare(mddev)) == NULL)
                        continue;
-               if (!mddev->pers->mark_spare)
+               printk(KERN_INFO "md%d: resyncing spare disk %s to replace failed disk\n", mdidx(mddev), partition_name(MKDEV(spare->major,spare->minor)));
+               if (!mddev->pers->diskop)
                        continue;
-               if (mddev->pers->mark_spare(mddev, spare, SPARE_WRITE))
+               if (mddev->pers->diskop(mddev, &spare, DISKOP_SPARE_WRITE))
                        continue;
-               if (md_do_sync(mddev) || (spare->state & (1 << MD_FAULTY_DEVICE))) {
-                       mddev->pers->mark_spare(mddev, spare, SPARE_INACTIVE);
+               down(&mddev->recovery_sem);
+               mddev->recovery_running = 1;
+               err = md_do_sync(mddev, spare);
+               if (err == -EIO) {
+                       printk(KERN_INFO "md%d: spare disk %s failed, skipping to next spare.\n", mdidx(mddev), partition_name(MKDEV(spare->major,spare->minor)));
+                       if (!disk_faulty(spare)) {
+                               mddev->pers->diskop(mddev,&spare,DISKOP_SPARE_INACTIVE);
+                               mark_disk_faulty(spare);
+                               mark_disk_nonsync(spare);
+                               mark_disk_inactive(spare);
+                               sb->spare_disks--;
+                               sb->working_disks--;
+                               sb->failed_disks++;
+                       }
+               } else
+                       if (disk_faulty(spare))
+                               mddev->pers->diskop(mddev, &spare,
+                                               DISKOP_SPARE_INACTIVE);
+               if (err == -EINTR) {
+                       /*
+                        * Recovery got interrupted ...
+                        * signal back that we have finished using the array.
+                        */
+                       mddev->pers->diskop(mddev, &spare,
+                                                        DISKOP_SPARE_INACTIVE);
+                       up(&mddev->recovery_sem);
+                       mddev->recovery_running = 0;
                        continue;
+               } else {
+                       mddev->recovery_running = 0;
+                       up(&mddev->recovery_sem);
                }
                save_flags(flags);
                cli();
-               mddev->pers->mark_spare(mddev, spare, SPARE_ACTIVE);
-               spare->state |= (1 << MD_SYNC_DEVICE);
-               spare->state |= (1 << MD_ACTIVE_DEVICE);
-               sb->spare_disks--;
-               sb->active_disks++;
-               mddev->sb_dirty = 1;
-               md_update_sb(mddev - md_dev);
+               if (!disk_faulty(spare)) {
+                       /*
+                        * the SPARE_ACTIVE diskop possibly changes the
+                        * pointer too
+                        */
+                       mddev->pers->diskop(mddev, &spare, DISKOP_SPARE_ACTIVE);
+                       mark_disk_sync(spare);
+                       mark_disk_active(spare);
+                       sb->active_disks++;
+                       sb->spare_disks--;
+               }
                restore_flags(flags);
+               mddev->sb_dirty = 1;
+               md_update_sb(mddev);
+               goto restart;
        }
+       printk(KERN_INFO "md: recovery thread finished ...\n");
        
 }
 
+int md_notify_reboot(struct notifier_block *this,
+                                       unsigned long code, void *x)
+{
+       struct md_list_head *tmp;
+       mddev_t *mddev;
+
+       if ((code == MD_SYS_DOWN) || (code == MD_SYS_HALT)
+                                 || (code == MD_SYS_POWER_OFF)) {
+
+               printk(KERN_INFO "stopping all md devices.\n");
+
+               ITERATE_MDDEV(mddev,tmp)
+                       do_md_stop (mddev, 1);
+               /*
+                * certain more exotic SCSI devices are known to be
+                * volatile wrt too early system reboots. While the
+                * right place to handle this issue is the given
+                * driver, we do want to have a safe RAID driver ...
+                */
+               md_mdelay(1000*1);
+       }
+       return NOTIFY_DONE;
+}
+
+struct notifier_block md_notifier = {
+       md_notify_reboot,
+       NULL,
+       0
+};
+
+md__initfunc(void raid_setup(char *str, int *ints))
+{
+       char tmpline[100];
+       int len, pos, nr, i;
+
+       len = strlen(str) + 1;
+       nr = 0;
+       pos = 0;
+
+       for (i = 0; i < len; i++) {
+               char c = str[i];
+
+               if (c == ',' || !c) {
+                       tmpline[pos] = 0;
+                       if (!strcmp(tmpline,"noautodetect"))
+                               raid_setup_args.noautodetect = 1;
+                       nr++;
+                       pos = 0;
+                       continue;
+               }
+               tmpline[pos] = c;
+               pos++;
+       }
+       raid_setup_args.set = 1;
+       return;
+}
+
 #ifdef CONFIG_MD_BOOT
 struct {
        int set;
        int ints[100];
        char str[100];
-} md_setup_args __initdata = {
+} md_setup_args md__initdata = {
        0,{0},{0}
 };
 
 /* called from init/main.c */
-__initfunc(void md_setup(char *str,int *ints))
+md__initfunc(void md_setup(char *str,int *ints))
 {
        int i;
        for(i=0;i<=ints[0];i++) {
@@ -1228,21 +3831,24 @@
        return;
 }
 
-__initfunc(void do_md_setup(char *str,int *ints))
+md__initfunc(void do_md_setup(char *str,int *ints))
 {
-       int minor, pers, factor, fault;
+#if 0
+       int minor, pers, chunk_size, fault;
        kdev_t dev;
        int i=1;
 
+       printk("i plan to phase this out --mingo\n");
+
        if(ints[0] < 4) {
-               printk ("md: Too few Arguments (%d).\n", ints[0]);
+               printk (KERN_WARNING "md: Too few Arguments (%d).\n", ints[0]);
                return;
        }
    
        minor=ints[i++];
    
-       if (minor >= MAX_MD_DEV) {
-               printk ("md: Minor device number too high.\n");
+       if ((unsigned int)minor >= MAX_MD_DEVS) {
+               printk (KERN_WARNING "md: Minor device number too high.\n");
                return;
        }
 
@@ -1252,18 +3858,20 @@
        case -1:
 #ifdef CONFIG_MD_LINEAR
                pers = LINEAR;
-               printk ("md: Setting up md%d as linear device.\n",minor);
+               printk (KERN_INFO "md: Setting up md%d as linear device.\n",
+                                                                       minor);
 #else 
-               printk ("md: Linear mode not configured." 
+               printk (KERN_WARNING "md: Linear mode not configured." 
                        "Recompile the kernel with linear mode enabled!\n");
 #endif
                break;
        case 0:
                pers = STRIPED;
 #ifdef CONFIG_MD_STRIPED
-               printk ("md: Setting up md%d as a striped device.\n",minor);
+               printk (KERN_INFO "md: Setting up md%d as a striped device.\n",
+                                                               minor);
 #else 
-               printk ("md: Striped mode not configured." 
+               printk (KERN_WARNING "md: Striped mode not configured." 
                        "Recompile the kernel with striped mode enabled!\n");
 #endif
                break;
@@ -1278,79 +3886,145 @@
                break;
 */
        default:           
-               printk ("md: Unknown or not supported raid level %d.\n", ints[--i]);
+               printk (KERN_WARNING "md: Unknown or not supported raid level %d.\n", ints[--i]);
                return;
        }
 
-       if(pers) {
+       if (pers) {
 
-         factor=ints[i++]; /* Chunksize  */
-         fault =ints[i++]; /* Faultlevel */
+               chunk_size = ints[i++]; /* Chunksize  */
+               fault = ints[i++]; /* Faultlevel */
    
-         pers=pers | factor | (fault << FAULT_SHIFT);   
+               pers = pers | chunk_size | (fault << FAULT_SHIFT);   
    
-         while( str && (dev = name_to_kdev_t(str))) {
-           do_md_add (minor, dev);
-           if((str = strchr (str, ',')) != NULL)
-             str++;
-         }
+               while( str && (dev = name_to_kdev_t(str))) {
+                       do_md_add (minor, dev);
+                       if((str = strchr (str, ',')) != NULL)
+                               str++;
+               }
 
-         do_md_run (minor, pers);
-         printk ("md: Loading md%d.\n",minor);
+               do_md_run (minor, pers);
+               printk (KERN_INFO "md: Loading md%d.\n",minor);
        }
-   
+#endif
 }
 #endif
 
+void hsm_init (void);
+void translucent_init (void);
 void linear_init (void);
 void raid0_init (void);
 void raid1_init (void);
 void raid5_init (void);
 
-__initfunc(int md_init (void))
+md__initfunc(int md_init (void))
 {
-  printk ("md driver %d.%d.%d MAX_MD_DEV=%d, MAX_REAL=%d\n",
-    MD_MAJOR_VERSION, MD_MINOR_VERSION, MD_PATCHLEVEL_VERSION,
-    MAX_MD_DEV, MAX_REAL);
-
-  if (register_blkdev (MD_MAJOR, "md", &md_fops))
-  {
-    printk ("Unable to get major %d for md\n", MD_MAJOR);
-    return (-1);
-  }
-
-  blk_dev[MD_MAJOR].request_fn=DEVICE_REQUEST;
-  blk_dev[MD_MAJOR].current_request=NULL;
-  read_ahead[MD_MAJOR]=INT_MAX;
-  memset(md_dev, 0, MAX_MD_DEV * sizeof (struct md_dev));
-  md_gendisk.next=gendisk_head;
-
-  gendisk_head=&md_gendisk;
-
-#if SUPPORT_RECONSTRUCTION
-  if ((md_sync_thread = md_register_thread(mdsyncd, NULL)) == NULL)
-    printk("md: bug: md_sync_thread == NULL\n");
-#endif /* SUPPORT_RECONSTRUCTION */
+       static char * name = "mdrecoveryd";
+
+       printk (KERN_INFO "md driver %d.%d.%d MAX_MD_DEVS=%d, MAX_REAL=%d\n",
+                       MD_MAJOR_VERSION, MD_MINOR_VERSION,
+                       MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MAX_REAL);
+
+       if (register_blkdev (MD_MAJOR, "md", &md_fops))
+       {
+               printk (KERN_ALERT "Unable to get major %d for md\n", MD_MAJOR);
+               return (-1);
+       }
+
+       blk_dev[MD_MAJOR].request_fn = DEVICE_REQUEST;
+       blk_dev[MD_MAJOR].current_request = NULL;
+       read_ahead[MD_MAJOR] = INT_MAX;
+       md_gendisk.next = gendisk_head;
+
+       gendisk_head = &md_gendisk;
+
+       md_recovery_thread = md_register_thread(md_do_recovery, NULL, name);
+       if (!md_recovery_thread)
+               printk(KERN_ALERT "bug: couldn't allocate md_recovery_thread\n");
 
+       md_register_reboot_notifier(&md_notifier);
+       md_register_sysctl();
+
+#ifdef CONFIG_MD_HSM
+       hsm_init ();
+#endif
+#ifdef CONFIG_MD_TRANSLUCENT
+       translucent_init ();
+#endif
 #ifdef CONFIG_MD_LINEAR
-  linear_init ();
+       linear_init ();
 #endif
 #ifdef CONFIG_MD_STRIPED
-  raid0_init ();
+       raid0_init ();
 #endif
 #ifdef CONFIG_MD_MIRRORING
-  raid1_init ();
+       raid1_init ();
 #endif
 #ifdef CONFIG_MD_RAID5
-  raid5_init ();
+       raid5_init ();
+#endif
+#if defined(CONFIG_MD_RAID5) || defined(CONFIG_MD_RAID5_MODULE)
+        /*
+         * pick a XOR routine, runtime.
+         */
+       calibrate_xor_block();
 #endif
-  return (0);
+
+       return (0);
 }
 
 #ifdef CONFIG_MD_BOOT
-__initfunc(void md_setup_drive(void))
+md__initfunc(void md_setup_drive(void))
 {
        if(md_setup_args.set)
                do_md_setup(md_setup_args.str, md_setup_args.ints);
 }
 #endif
+
+MD_EXPORT_SYMBOL(md_size);
+MD_EXPORT_SYMBOL(register_md_personality);
+MD_EXPORT_SYMBOL(unregister_md_personality);
+MD_EXPORT_SYMBOL(partition_name);
+MD_EXPORT_SYMBOL(md_error);
+MD_EXPORT_SYMBOL(md_recover_arrays);
+MD_EXPORT_SYMBOL(md_register_thread);
+MD_EXPORT_SYMBOL(md_unregister_thread);
+MD_EXPORT_SYMBOL(md_update_sb);
+MD_EXPORT_SYMBOL(md_map);
+MD_EXPORT_SYMBOL(md_wakeup_thread);
+MD_EXPORT_SYMBOL(md_do_sync);
+MD_EXPORT_SYMBOL(md_print_devices);
+MD_EXPORT_SYMBOL(find_rdev_nr);
+MD_EXPORT_SYMBOL(md_check_ordering);
+MD_EXPORT_SYMBOL(md_interrupt_thread);
+MD_EXPORT_SYMBOL(mddev_map);
+
+#ifdef CONFIG_PROC_FS
+static struct proc_dir_entry proc_md = {
+       PROC_MD, 6, "mdstat",
+       S_IFREG | S_IRUGO, 1, 0, 0,
+       0, &proc_array_inode_operations,
+};
+#endif
+
+static void md_geninit (struct gendisk *gdisk)
+{
+       int i;
+  
+       for(i = 0; i < MAX_MD_DEVS; i++) {
+               md_blocksizes[i] = 1024;
+               md_maxreadahead[i] = MD_READAHEAD;
+               md_gendisk.part[i].start_sect = -1; /* avoid partition check */
+               md_gendisk.part[i].nr_sects = 0;
+       }
+
+       printk("md.c: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
+
+       blksize_size[MD_MAJOR] = md_blocksizes;
+       md_set_global_readahead(md_maxreadahead);
+
+#ifdef CONFIG_PROC_FS
+       proc_register(&proc_root, &proc_md);
+#endif
+}
+
--- linux/drivers/block/raid0.c.orig    Mon Sep  4 19:39:16 2000
+++ linux/drivers/block/raid0.c Tue Jan 16 13:42:04 2001
@@ -1,4 +1,3 @@
-
 /*
    raid0.c : Multiple Devices driver for Linux
              Copyright (C) 1994-96 Marc ZYNGIER
@@ -18,146 +17,201 @@
 */
 
 #include <linux/module.h>
-#include <linux/md.h>
-#include <linux/raid0.h>
-#include <linux/vmalloc.h>
+#include <linux/raid/raid0.h>
 
 #define MAJOR_NR MD_MAJOR
 #define MD_DRIVER
 #define MD_PERSONALITY
 
-static int create_strip_zones (int minor, struct md_dev *mddev)
+static int create_strip_zones (mddev_t *mddev)
 {
-  int i, j, c=0;
-  int current_offset=0;
-  struct real_dev *smallest_by_zone;
-  struct raid0_data *data=(struct raid0_data *) mddev->private;
-  
-  data->nr_strip_zones=1;
-  
-  for (i=1; i<mddev->nb_dev; i++)
-  {
-    for (j=0; j<i; j++)
-      if (mddev->devices[i].size==mddev->devices[j].size)
-      {
-       c=1;
-       break;
-      }
-
-    if (!c)
-      data->nr_strip_zones++;
-
-    c=0;
-  }
-
-  if ((data->strip_zone=vmalloc(sizeof(struct strip_zone)*data->nr_strip_zones)) == NULL)
-    return 1;
-
-  data->smallest=NULL;
-  
-  for (i=0; i<data->nr_strip_zones; i++)
-  {
-    data->strip_zone[i].dev_offset=current_offset;
-    smallest_by_zone=NULL;
-    c=0;
-
-    for (j=0; j<mddev->nb_dev; j++)
-      if (mddev->devices[j].size>current_offset)
-      {
-       data->strip_zone[i].dev[c++]=mddev->devices+j;
-       if (!smallest_by_zone ||
-           smallest_by_zone->size > mddev->devices[j].size)
-         smallest_by_zone=mddev->devices+j;
-      }
-
-    data->strip_zone[i].nb_dev=c;
-    data->strip_zone[i].size=(smallest_by_zone->size-current_offset)*c;
-
-    if (!data->smallest ||
-       data->smallest->size > data->strip_zone[i].size)
-      data->smallest=data->strip_zone+i;
-
-    data->strip_zone[i].zone_offset=i ? (data->strip_zone[i-1].zone_offset+
-                                          data->strip_zone[i-1].size) : 0;
-    current_offset=smallest_by_zone->size;
-  }
-  return 0;
+       int i, c, j, j1, j2;
+       int current_offset, curr_zone_offset;
+       raid0_conf_t *conf = mddev_to_conf(mddev);
+       mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev;
+ 
+       /*
+        * The number of 'same size groups'
+        */
+       conf->nr_strip_zones = 0;
+ 
+       ITERATE_RDEV_ORDERED(mddev,rdev1,j1) {
+               printk("raid0: looking at %s\n", partition_name(rdev1->dev));
+               c = 0;
+               ITERATE_RDEV_ORDERED(mddev,rdev2,j2) {
+                       printk("raid0:   comparing %s(%d) with %s(%d)\n", partition_name(rdev1->dev), rdev1->size, partition_name(rdev2->dev), rdev2->size);
+                       if (rdev2 == rdev1) {
+                               printk("raid0:   END\n");
+                               break;
+                       }
+                       if (rdev2->size == rdev1->size)
+                       {
+                               /*
+                                * Not unique, dont count it as a new
+                                * group
+                                */
+                               printk("raid0:   EQUAL\n");
+                               c = 1;
+                               break;
+                       }
+                       printk("raid0:   NOT EQUAL\n");
+               }
+               if (!c) {
+                       printk("raid0:   ==> UNIQUE\n");
+                       conf->nr_strip_zones++;
+                       printk("raid0: %d zones\n", conf->nr_strip_zones);
+               }
+       }
+               printk("raid0: FINAL %d zones\n", conf->nr_strip_zones);
+
+       conf->strip_zone = vmalloc(sizeof(struct strip_zone)*
+                               conf->nr_strip_zones);
+       if (!conf->strip_zone)
+               return 1;
+
+
+       conf->smallest = NULL;
+       current_offset = 0;
+       curr_zone_offset = 0;
+
+       for (i = 0; i < conf->nr_strip_zones; i++)
+       {
+               struct strip_zone *zone = conf->strip_zone + i;
+
+               printk("zone %d\n", i);
+               zone->dev_offset = current_offset;
+               smallest = NULL;
+               c = 0;
+
+               ITERATE_RDEV_ORDERED(mddev,rdev,j) {
+
+                       printk(" checking %s ...", partition_name(rdev->dev));
+                       if (rdev->size > current_offset)
+                       {
+                               printk(" contained as device %d\n", c);
+                               zone->dev[c] = rdev;
+                               c++;
+                               if (!smallest || (rdev->size <smallest->size)) {
+                                       smallest = rdev;
+                                       printk("  (%d) is smallest!.\n", rdev->size);
+                               }
+                       } else
+                               printk(" nope.\n");
+               }
+
+               zone->nb_dev = c;
+               zone->size = (smallest->size - current_offset) * c;
+               printk(" zone->nb_dev: %d, size: %d\n",zone->nb_dev,zone->size);
+
+               if (!conf->smallest || (zone->size < conf->smallest->size))
+                       conf->smallest = zone;
+
+               zone->zone_offset = curr_zone_offset;
+               curr_zone_offset += zone->size;
+
+               current_offset = smallest->size;
+               printk("current zone offset: %d\n", current_offset);
+       }
+       printk("done.\n");
+       return 0;
 }
 
-static int raid0_run (int minor, struct md_dev *mddev)
+static int raid0_run (mddev_t *mddev)
 {
-  int cur=0, i=0, size, zone0_size, nb_zone;
-  struct raid0_data *data;
-
-  MOD_INC_USE_COUNT;
+       int cur=0, i=0, size, zone0_size, nb_zone;
+       raid0_conf_t *conf;
 
-  if ((mddev->private=vmalloc (sizeof (struct raid0_data))) == NULL) return 1;
-  data=(struct raid0_data *) mddev->private;
-  
-  if (create_strip_zones (minor, mddev)) 
-  {
-       vfree(data);
-       return 1;
-  }
-
-  nb_zone=data->nr_zones=
-    md_size[minor]/data->smallest->size +
-    (md_size[minor]%data->smallest->size ? 1 : 0);
-
-  printk ("raid0 : Allocating %ld bytes for hash.\n",(long)sizeof(struct raid0_hash)*nb_zone);
-  if ((data->hash_table=vmalloc (sizeof (struct raid0_hash)*nb_zone)) == NULL)
-  {
-    vfree(data->strip_zone);
-    vfree(data);
-    return 1;
-  }
-  size=data->strip_zone[cur].size;
-
-  i=0;
-  while (cur<data->nr_strip_zones)
-  {
-    data->hash_table[i].zone0=data->strip_zone+cur;
-
-    if (size>=data->smallest->size)/* If we completely fill the slot */
-    {
-      data->hash_table[i++].zone1=NULL;
-      size-=data->smallest->size;
-
-      if (!size)
-      {
-       if (++cur==data->nr_strip_zones) continue;
-       size=data->strip_zone[cur].size;
-      }
-
-      continue;
-    }
-
-    if (++cur==data->nr_strip_zones) /* Last dev, set unit1 as NULL */
-    {
-      data->hash_table[i].zone1=NULL;
-      continue;
-    }
-
-    zone0_size=size;           /* Here, we use a 2nd dev to fill the slot */
-    size=data->strip_zone[cur].size;
-    data->hash_table[i++].zone1=data->strip_zone+cur;
-    size-=(data->smallest->size - zone0_size);
-  }
+       MOD_INC_USE_COUNT;
 
-  return (0);
+       conf = vmalloc(sizeof (raid0_conf_t));
+       if (!conf)
+               goto out;
+       mddev->private = (void *)conf;
+ 
+       if (md_check_ordering(mddev)) {
+               printk("raid0: disks are not ordered, aborting!\n");
+               goto out_free_conf;
+       }
+
+       if (create_strip_zones (mddev)) 
+               goto out_free_conf;
+
+       printk("raid0 : md_size is %d blocks.\n", md_size[mdidx(mddev)]);
+       printk("raid0 : conf->smallest->size is %d blocks.\n", conf->smallest->size);
+       nb_zone = md_size[mdidx(mddev)]/conf->smallest->size +
+                       (md_size[mdidx(mddev)] % conf->smallest->size ? 1 : 0);
+       printk("raid0 : nb_zone is %d.\n", nb_zone);
+       conf->nr_zones = nb_zone;
+
+       printk("raid0 : Allocating %d bytes for hash.\n",
+                               sizeof(struct raid0_hash)*nb_zone);
+
+       conf->hash_table = vmalloc (sizeof (struct raid0_hash)*nb_zone);
+       if (!conf->hash_table)
+               goto out_free_zone_conf;
+       size = conf->strip_zone[cur].size;
+
+       i = 0;
+       while (cur < conf->nr_strip_zones) {
+               conf->hash_table[i].zone0 = conf->strip_zone + cur;
+
+               /*
+                * If we completely fill the slot
+                */
+               if (size >= conf->smallest->size) {
+                       conf->hash_table[i++].zone1 = NULL;
+                       size -= conf->smallest->size;
+
+                       if (!size) {
+                               if (++cur == conf->nr_strip_zones)
+                                       continue;
+                               size = conf->strip_zone[cur].size;
+                       }
+                       continue;
+               }
+               if (++cur == conf->nr_strip_zones) {
+                       /*
+                        * Last dev, set unit1 as NULL
+                        */
+                       conf->hash_table[i].zone1=NULL;
+                       continue;
+               }
+
+               /*
+                * Here we use a 2nd dev to fill the slot
+                */
+               zone0_size = size;
+               size = conf->strip_zone[cur].size;
+               conf->hash_table[i++].zone1 = conf->strip_zone + cur;
+               size -= (conf->smallest->size - zone0_size);
+       }
+       return 0;
+
+out_free_zone_conf:
+       vfree(conf->strip_zone);
+       conf->strip_zone = NULL;
+
+out_free_conf:
+       vfree(conf);
+       mddev->private = NULL;
+out:
+       MOD_DEC_USE_COUNT;
+       return 1;
 }
 
-
-static int raid0_stop (int minor, struct md_dev *mddev)
+static int raid0_stop (mddev_t *mddev)
 {
-  struct raid0_data *data=(struct raid0_data *) mddev->private;
+       raid0_conf_t *conf = mddev_to_conf(mddev);
 
-  vfree (data->hash_table);
-  vfree (data->strip_zone);
-  vfree (data);
+       vfree (conf->hash_table);
+       conf->hash_table = NULL;
+       vfree (conf->strip_zone);
+       conf->strip_zone = NULL;
+       vfree (conf);
+       mddev->private = NULL;
 
-  MOD_DEC_USE_COUNT;
-  return 0;
+       MOD_DEC_USE_COUNT;
+       return 0;
 }
 
 /*
@@ -167,135 +221,140 @@
  * Of course, those facts may not be valid anymore (and surely won't...)
  * Hey guys, there's some work out there ;-)
  */
-static int raid0_map (struct md_dev *mddev, kdev_t *rdev,
+static int raid0_map (mddev_t *mddev, kdev_t dev, kdev_t *rdev,
                      unsigned long *rsector, unsigned long size)
 {
-  struct raid0_data *data=(struct raid0_data *) mddev->private;
-  static struct raid0_hash *hash;
-  struct strip_zone *zone;
-  struct real_dev *tmp_dev;
-  int blk_in_chunk, factor, chunk, chunk_size;
-  long block, rblock;
-
-  factor=FACTOR(mddev);
-  chunk_size=(1UL << FACTOR_SHIFT(factor));
-  block=*rsector >> 1;
-  hash=data->hash_table+(block/data->smallest->size);
-
-  if (hash - data->hash_table > data->nr_zones) 
-  { 
-         printk(KERN_DEBUG "raid0_map: invalid block %li\n", block);
-         return -1;
-  }
-
-  /* Sanity check */
-  if ((chunk_size*2)<(*rsector % (chunk_size*2))+size)
-  {
-    printk ("raid0_convert : can't convert block across chunks or bigger than %dk %ld %ld\n", chunk_size, *rsector, size);
-    return (-1);
-  }
-  
-  if (block >= (hash->zone0->size +
-               hash->zone0->zone_offset))
-  {
-    if (!hash->zone1)
-    {
-      printk ("raid0_convert : hash->zone1==NULL for block %ld\n", block);
-      return (-1);
-    }
-    
-    zone=hash->zone1;
-  }
-  else
-    zone=hash->zone0;
+       raid0_conf_t *conf = mddev_to_conf(mddev);
+       struct raid0_hash *hash;
+       struct strip_zone *zone;
+       mdk_rdev_t *tmp_dev;
+       int blk_in_chunk, chunksize_bits, chunk, chunk_size;
+       long block, rblock;
+
+       chunk_size = mddev->param.chunk_size >> 10;
+       chunksize_bits = ffz(~chunk_size);
+       block = *rsector >> 1;
+       hash = conf->hash_table + block / conf->smallest->size;
+
+       if (hash - conf->hash_table > conf->nr_zones) {
+               printk(KERN_DEBUG "raid0_map: invalid block %lu\n", block);
+               return -1;
+       }
+
+       /* Sanity check */
+       if ((chunk_size * 2) < (*rsector % (chunk_size * 2)) + size)
+               goto bad_map;
+ 
+       if (!hash)
+               goto bad_hash;
+
+       if (!hash->zone0)
+               goto bad_zone0;
+ 
+       if (block >= (hash->zone0->size + hash->zone0->zone_offset)) {
+               if (!hash->zone1)
+                       goto bad_zone1;
+               zone = hash->zone1;
+       } else
+               zone = hash->zone0;
     
-  blk_in_chunk=block & (chunk_size -1);
-  chunk=(block - zone->zone_offset) / (zone->nb_dev<<FACTOR_SHIFT(factor));
-  tmp_dev=zone->dev[(block >> FACTOR_SHIFT(factor)) % zone->nb_dev];
-  rblock=(chunk << FACTOR_SHIFT(factor)) + blk_in_chunk + zone->dev_offset;
+       blk_in_chunk = block & (chunk_size -1);
+       chunk = (block - zone->zone_offset) / (zone->nb_dev << chunksize_bits);
+       tmp_dev = zone->dev[(block >> chunksize_bits) % zone->nb_dev];
+       rblock = (chunk << chunksize_bits) + blk_in_chunk + zone->dev_offset;
   
-  *rdev=tmp_dev->dev;
-  *rsector=rblock<<1;
+       *rdev = tmp_dev->dev;
+       *rsector = rblock << 1;
 
-  return (0);
+       return 0;
+
+bad_map:
+       printk ("raid0_map bug: can't convert block across chunks or bigger than %dk %ld %ld\n", chunk_size, *rsector, size);
+       return -1;
+bad_hash:
+       printk("raid0_map bug: hash==NULL for block %ld\n", block);
+       return -1;
+bad_zone0:
+       printk ("raid0_map bug: hash->zone0==NULL for block %ld\n", block);
+       return -1;
+bad_zone1:
+       printk ("raid0_map bug: hash->zone1==NULL for block %ld\n", block);
+       return -1;
 }
 
                           
-static int raid0_status (char *page, int minor, struct md_dev *mddev)
+static int raid0_status (char *page, mddev_t *mddev)
 {
-  int sz=0;
+       int sz = 0;
 #undef MD_DEBUG
 #ifdef MD_DEBUG
-  int j, k;
-  struct raid0_data *data=(struct raid0_data *) mddev->private;
+       int j, k;
+       raid0_conf_t *conf = mddev_to_conf(mddev);
   
-  sz+=sprintf (page+sz, "      ");
-  for (j=0; j<data->nr_zones; j++)
-  {
-    sz+=sprintf (page+sz, "[z%d",
-                data->hash_table[j].zone0-data->strip_zone);
-    if (data->hash_table[j].zone1)
-      sz+=sprintf (page+sz, "/z%d] ",
-                  data->hash_table[j].zone1-data->strip_zone);
-    else
-      sz+=sprintf (page+sz, "] ");
-  }
+       sz += sprintf(page + sz, "      ");
+       for (j = 0; j < conf->nr_zones; j++) {
+               sz += sprintf(page + sz, "[z%d",
+                               conf->hash_table[j].zone0 - conf->strip_zone);
+               if (conf->hash_table[j].zone1)
+                       sz += sprintf(page+sz, "/z%d] ",
+                               conf->hash_table[j].zone1 - conf->strip_zone);
+               else
+                       sz += sprintf(page+sz, "] ");
+       }
   
-  sz+=sprintf (page+sz, "\n");
+       sz += sprintf(page + sz, "\n");
   
-  for (j=0; j<data->nr_strip_zones; j++)
-  {
-    sz+=sprintf (page+sz, "      z%d=[", j);
-    for (k=0; k<data->strip_zone[j].nb_dev; k++)
-      sz+=sprintf (page+sz, "%s/",
-                  partition_name(data->strip_zone[j].dev[k]->dev));
-    sz--;
-    sz+=sprintf (page+sz, "] zo=%d do=%d s=%d\n",
-                data->strip_zone[j].zone_offset,
-                data->strip_zone[j].dev_offset,
-                data->strip_zone[j].size);
-  }
+       for (j = 0; j < conf->nr_strip_zones; j++) {
+               sz += sprintf(page + sz, "      z%d=[", j);
+               for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
+                       sz += sprintf (page+sz, "%s/", partition_name(
+                               conf->strip_zone[j].dev[k]->dev));
+               sz--;
+               sz += sprintf (page+sz, "] zo=%d do=%d s=%d\n",
+                               conf->strip_zone[j].zone_offset,
+                               conf->strip_zone[j].dev_offset,
+                               conf->strip_zone[j].size);
+       }
 #endif
-  sz+=sprintf (page+sz, " %dk chunks", 1<<FACTOR_SHIFT(FACTOR(mddev)));
-  return sz;
+       sz += sprintf(page + sz, " %dk chunks", mddev->param.chunk_size/1024);
+       return sz;
 }
 
-
-static struct md_personality raid0_personality=
+static mdk_personality_t raid0_personality=
 {
-  "raid0",
-  raid0_map,
-  NULL,                                /* no special make_request */
-  NULL,                                /* no special end_request */
-  raid0_run,
-  raid0_stop,
-  raid0_status,
-  NULL,                                /* no ioctls */
-  0,
-  NULL,                                /* no error_handler */
-  NULL,                                /* hot_add_disk */
-  NULL,                                /* hot_remove_disk */
-  NULL                         /* mark_spare */
+       "raid0",
+       raid0_map,
+       NULL,                           /* no special make_request */
+       NULL,                           /* no special end_request */
+       raid0_run,
+       raid0_stop,
+       raid0_status,
+       NULL,                           /* no ioctls */
+       0,
+       NULL,                           /* no error_handler */
+       NULL,                           /* no diskop */
+       NULL,                           /* no stop resync */
+       NULL                            /* no restart resync */
 };
 
-
 #ifndef MODULE
 
 void raid0_init (void)
 {
-  register_md_personality (RAID0, &raid0_personality);
+       register_md_personality (RAID0, &raid0_personality);
 }
 
 #else
 
 int init_module (void)
 {
-  return (register_md_personality (RAID0, &raid0_personality));
+       return (register_md_personality (RAID0, &raid0_personality));
 }
 
 void cleanup_module (void)
 {
-  unregister_md_personality (RAID0);
+       unregister_md_personality (RAID0);
 }
 
 #endif
+
--- linux/drivers/block/raid1.c.orig    Mon Dec 11 01:49:41 2000
+++ linux/drivers/block/raid1.c Tue Jan 16 13:42:04 2001
@@ -1,6 +1,6 @@
-/************************************************************************
+/*
  * raid1.c : Multiple Devices driver for Linux
- *           Copyright (C) 1996 Ingo Molnar, Miguel de Icaza, Gadi Oxman
+ * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman
  *
  * RAID-1 management functions.
  *
@@ -15,50 +15,55 @@
  */
 
 #include <linux/module.h>
-#include <linux/locks.h>
 #include <linux/malloc.h>
-#include <linux/md.h>
-#include <linux/raid1.h>
-#include <asm/bitops.h>
+#include <linux/raid/raid1.h>
 #include <asm/atomic.h>
 
 #define MAJOR_NR MD_MAJOR
 #define MD_DRIVER
 #define MD_PERSONALITY
 
-/*
- * The following can be used to debug the driver
- */
-/*#define RAID1_DEBUG*/
-#ifdef RAID1_DEBUG
-#define PRINTK(x)   do { printk x; } while (0);
-#else
-#define PRINTK(x)   do { ; } while (0);
-#endif
+#define MAX_LINEAR_SECTORS 128
 
 #define MAX(a,b)       ((a) > (b) ? (a) : (b))
 #define MIN(a,b)       ((a) < (b) ? (a) : (b))
 
-static struct md_personality raid1_personality;
-static struct md_thread *raid1_thread = NULL;
+static mdk_personality_t raid1_personality;
 struct buffer_head *raid1_retry_list = NULL;
 
-static int __raid1_map (struct md_dev *mddev, kdev_t *rdev,
+static void * raid1_kmalloc (int size)
+{
+       void * ptr;
+       /*
+        * now we are rather fault tolerant than nice, but
+        * there are a couple of places in the RAID code where we
+        * simply can not afford to fail an allocation because
+        * there is no failure return path (eg. make_request())
+        */
+       while (!(ptr = kmalloc (sizeof (raid1_conf_t), GFP_BUFFER))) {
+               printk ("raid1: out of memory, retrying...\n");
+               current->state = TASK_UNINTERRUPTIBLE;
+               schedule_timeout(HZ/10);
+       }
+
+       memset(ptr, 0, size);
+       return ptr;
+}
+
+static int __raid1_map (mddev_t *mddev, kdev_t *rdev,
                        unsigned long *rsector, unsigned long size)
 {
-       struct raid1_data *raid_conf = (struct raid1_data *) mddev->private;
-       int i, n = raid_conf->raid_disks;
+       raid1_conf_t *conf = mddev_to_conf(mddev);
+       int i, disks = MD_SB_DISKS;
 
        /*
         * Later we do read balancing on the read side 
         * now we use the first available disk.
         */
 
-       PRINTK(("raid1_map().\n"));
-
-       for (i=0; i<n; i++) {
-               if (raid_conf->mirrors[i].operational) {
-                       *rdev = raid_conf->mirrors[i].dev;
+       for (i = 0; i < disks; i++) {
+               if (conf->mirrors[i].operational) {
+                       *rdev = conf->mirrors[i].dev;
                        return (0);
                }
        }
@@ -67,29 +72,29 @@
        return (-1);
 }
 
-static int raid1_map (struct md_dev *mddev, kdev_t *rdev,
+static int raid1_map (mddev_t *mddev, kdev_t dev, kdev_t *rdev,
                      unsigned long *rsector, unsigned long size)
 {
        return 0;
 }
 
-void raid1_reschedule_retry (struct buffer_head *bh)
+static void raid1_reschedule_retry (struct buffer_head *bh)
 {
        struct raid1_bh * r1_bh = (struct raid1_bh *)(bh->b_dev_id);
-
-       PRINTK(("raid1_reschedule_retry().\n"));
+       mddev_t *mddev = r1_bh->mddev;
+       raid1_conf_t *conf = mddev_to_conf(mddev);
 
        r1_bh->next_retry = raid1_retry_list;
        raid1_retry_list = bh;
-       md_wakeup_thread(raid1_thread);
+       md_wakeup_thread(conf->thread);
 }
 
 /*
- * raid1_end_buffer_io() is called when we have finished servicing a mirrored
+ * raid1_end_bh_io() is called when we have finished servicing a mirrored
  * operation and are ready to return a success/failure code to the buffer
  * cache layer.
  */
-static inline void raid1_end_buffer_io(struct raid1_bh *r1_bh, int uptodate)
+static void raid1_end_bh_io (struct raid1_bh *r1_bh, int uptodate)
 {
        struct buffer_head *bh = r1_bh->master_bh;
 
@@ -97,8 +102,6 @@
        kfree(r1_bh);
 }
 
-int raid1_one_error=0;
-
 void raid1_end_request (struct buffer_head *bh, int uptodate)
 {
        struct raid1_bh * r1_bh = (struct raid1_bh *)(bh->b_dev_id);
@@ -106,12 +109,7 @@
 
        save_flags(flags);
        cli();
-       PRINTK(("raid1_end_request().\n"));
 
-       if (raid1_one_error) {
-               raid1_one_error=0;
-               uptodate=0;
-       }
        /*
         * this branch is our 'one mirror IO has finished' event handler:
         */
@@ -136,15 +134,11 @@
         */
 
        if ( (r1_bh->cmd == READ) || (r1_bh->cmd == READA) ) {
-
-               PRINTK(("raid1_end_request(), read branch.\n"));
-
                /*
                 * we have only one buffer_head on the read side
                 */
                if (uptodate) {
-                       PRINTK(("raid1_end_request(), read branch, uptodate.\n"));
-                       raid1_end_buffer_io(r1_bh, uptodate);
+                       raid1_end_bh_io(r1_bh, uptodate);
                        restore_flags(flags);
                        return;
                }
@@ -152,71 +146,56 @@
                 * oops, read error:
                 */
                printk(KERN_ERR "raid1: %s: rescheduling block %lu\n", 
-                                kdevname(bh->b_dev), bh->b_blocknr);
-               raid1_reschedule_retry (bh);
+                        partition_name(bh->b_dev), bh->b_blocknr);
+               raid1_reschedule_retry(bh);
                restore_flags(flags);
                return;
        }
 
        /*
-        * WRITE or WRITEA.
-        */
-       PRINTK(("raid1_end_request(), write branch.\n"));
-
-       /*
+        * WRITE:
+        *
         * Let's see if all mirrored write operations have finished 
-        * already [we have irqs off, so we can decrease]:
+        * already.
         */
 
-       if (!--r1_bh->remaining) {
-               struct md_dev *mddev = r1_bh->mddev;
-               struct raid1_data *raid_conf = (struct raid1_data *) mddev->private;
-               int i, n = raid_conf->raid_disks;
-
-               PRINTK(("raid1_end_request(), remaining == 0.\n"));
+       if (atomic_dec_and_test(&r1_bh->remaining)) {
+               int i, disks = MD_SB_DISKS;
 
-               for ( i=0; i<n; i++)
-                       if (r1_bh->mirror_bh[i]) kfree(r1_bh->mirror_bh[i]);
+               for ( i = 0; i < disks; i++)
+                       if (r1_bh->mirror_bh[i])
+                               kfree(r1_bh->mirror_bh[i]);
 
-               raid1_end_buffer_io(r1_bh, test_bit(BH_Uptodate, &r1_bh->state));
+               raid1_end_bh_io(r1_bh, test_bit(BH_Uptodate, &r1_bh->state));
        }
-       else PRINTK(("raid1_end_request(), remaining == %u.\n", r1_bh->remaining));
        restore_flags(flags);
 }
 
-/* This routine checks if the undelying device is an md device and in that
- * case it maps the blocks before putting the request on the queue
+/*
+ * This routine checks if the undelying device is an md device
+ * and in that case it maps the blocks before putting the
+ * request on the queue
  */
-static inline void
-map_and_make_request (int rw, struct buffer_head *bh)
+static void map_and_make_request (int rw, struct buffer_head *bh)
 {
        if (MAJOR (bh->b_rdev) == MD_MAJOR)
-               md_map (MINOR (bh->b_rdev), &bh->b_rdev, &bh->b_rsector, bh->b_size >> 9);
+               md_map (bh->b_rdev, &bh->b_rdev,
+                               &bh->b_rsector, bh->b_size >> 9);
        clear_bit(BH_Lock, &bh->b_state);
        make_request (MAJOR (bh->b_rdev), rw, bh);
 }
        
-static int
-raid1_make_request (struct md_dev *mddev, int rw, struct buffer_head * bh)
+static int raid1_make_request (mddev_t *mddev, int rw,
+                                                struct buffer_head * bh)
 {
-
-       struct raid1_data *raid_conf = (struct raid1_data *) mddev->private;
+       raid1_conf_t *conf = mddev_to_conf(mddev);
        struct buffer_head *mirror_bh[MD_SB_DISKS], *bh_req;
        struct raid1_bh * r1_bh;
-       int n = raid_conf->raid_disks, i, sum_bhs = 0, switch_disks = 0, sectors;
+       int disks = MD_SB_DISKS;
+       int i, sum_bhs = 0, switch_disks = 0, sectors, lowprio = 0;
        struct mirror_info *mirror;
 
-       PRINTK(("raid1_make_request().\n"));
-
-       while (!( /* FIXME: now we are rather fault tolerant than nice */
-       r1_bh = kmalloc (sizeof (struct raid1_bh), GFP_BUFFER)
-       ) )
-       {
-               printk ("raid1_make_request(#1): out of memory\n");
-               current->policy |= SCHED_YIELD;
-               schedule();
-       }
-       memset (r1_bh, 0, sizeof (struct raid1_bh));
+       r1_bh = raid1_kmalloc (sizeof (struct raid1_bh));
 
 /*
  * make_request() can abort the operation when READA or WRITEA are being
@@ -227,43 +206,65 @@
        if (rw == READA) rw = READ;
        if (rw == WRITEA) rw = WRITE;
 
-       if (rw == WRITE || rw == WRITEA)
-               mark_buffer_clean(bh);          /* Too early ? */
+       if (rw == WRITE) {
+               /*
+                * Too early ?
+                */
+               mark_buffer_clean(bh);
+               /*
+                * not too early. we _first_ clean the bh, then we start
+                * the IO, then when the IO has finished, we unlock the
+                * bh and mark it uptodate. This way we do not miss the
+                * case when the bh got dirty again during the IO.
+                */
+       }
+
+       /*
+        * special flag for 'lowprio' reconstruction requests ...
+        */
+       if (buffer_lowprio(bh))
+               lowprio = 1;
 
 /*
- * i think the read and write branch should be separated completely, since we want
- * to do read balancing on the read side for example. Comments? :) --mingo
+ * i think the read and write branch should be separated completely,
+ * since we want to do read balancing on the read side for example.
+ * Comments? :) --mingo
  */
 
        r1_bh->master_bh=bh;
        r1_bh->mddev=mddev;
        r1_bh->cmd = rw;
 
-       if (rw==READ || rw==READA) {
-               int last_used = raid_conf->last_used;
-               PRINTK(("raid1_make_request(), read branch.\n"));
-               mirror = raid_conf->mirrors + last_used;
+       if (rw==READ) {
+               int last_used = conf->last_used;
+
+               /*
+                * read balancing logic:
+                */
+               mirror = conf->mirrors + last_used;
                bh->b_rdev = mirror->dev;
                sectors = bh->b_size >> 9;
-               if (bh->b_blocknr * sectors == raid_conf->next_sect) {
-                       raid_conf->sect_count += sectors;
-                       if (raid_conf->sect_count >= mirror->sect_limit)
+
+               if (bh->b_blocknr * sectors == conf->next_sect) {
+                       conf->sect_count += sectors;
+                       if (conf->sect_count >= mirror->sect_limit)
                                switch_disks = 1;
                } else
                        switch_disks = 1;
-               raid_conf->next_sect = (bh->b_blocknr + 1) * sectors;
-               if (switch_disks) {
-                       PRINTK(("read-balancing: switching %d -> %d (%d sectors)\n", last_used, mirror->next, raid_conf->sect_count));
-                       raid_conf->sect_count = 0;
-                       last_used = raid_conf->last_used = mirror->next;
+               conf->next_sect = (bh->b_blocknr + 1) * sectors;
+               /*
+                * Do not switch disks if full resync is in progress ...
+                */
+               if (switch_disks && !conf->resync_mirrors) {
+                       conf->sect_count = 0;
+                       last_used = conf->last_used = mirror->next;
                        /*
-                        * Do not switch to write-only disks ... resyncing
-                        * is in progress
+                        * Do not switch to write-only disks ...
+                        * reconstruction is in progress
                         */
-                       while (raid_conf->mirrors[last_used].write_only)
-                               raid_conf->last_used = raid_conf->mirrors[last_used].next;
+                       while (conf->mirrors[last_used].write_only)
+                               conf->last_used = conf->mirrors[last_used].next;
                }
-               PRINTK (("raid1 read queue: %d %d\n", MAJOR (bh->b_rdev), MINOR (bh->b_rdev)));
                bh_req = &r1_bh->bh_req;
                memcpy(bh_req, bh, sizeof(*bh));
                bh_req->b_end_io = raid1_end_request;
@@ -273,13 +274,12 @@
        }
 
        /*
-        * WRITE or WRITEA.
+        * WRITE:
         */
-       PRINTK(("raid1_make_request(n=%d), write branch.\n",n));
 
-       for (i = 0; i < n; i++) {
+       for (i = 0; i < disks; i++) {
 
-               if (!raid_conf->mirrors [i].operational) {
+               if (!conf->mirrors[i].operational) {
                        /*
                         * the r1_bh->mirror_bh[i] pointer remains NULL
                         */
@@ -287,89 +287,91 @@
                        continue;
                }
 
+               /*
+                * special case for reconstruction ...
+                */
+               if (lowprio && (i == conf->last_used)) {
+                       mirror_bh[i] = NULL;
+                       continue;
+               }
+ 
+       /*
+        * We should use a private pool (size depending on NR_REQUEST),
+        * to avoid writes filling up the memory with bhs
+        *
+        * Such pools are much faster than kmalloc anyways (so we waste
+        * almost nothing by not using the master bh when writing and
+        * win alot of cleanness) but for now we are cool enough. --mingo
+        *
+        * It's safe to sleep here, buffer heads cannot be used in a shared
+        * manner in the write branch. Look how we lock the buffer at the
+        * beginning of this function to grok the difference ;)
+        */
+               mirror_bh[i] = raid1_kmalloc(sizeof(struct buffer_head));
+       /*
+        * prepare mirrored bh (fields ordered for max mem throughput):
+        */
+               mirror_bh[i]->b_blocknr    = bh->b_blocknr;
+               mirror_bh[i]->b_dev        = bh->b_dev;
+               mirror_bh[i]->b_rdev       = conf->mirrors[i].dev;
+               mirror_bh[i]->b_rsector    = bh->b_rsector;
+               mirror_bh[i]->b_state      = (1<<BH_Req) | (1<<BH_Dirty);
+               if (lowprio)
+                       mirror_bh[i]->b_state |= (1<<BH_LowPrio);
+ 
+               mirror_bh[i]->b_count      = 1;
+               mirror_bh[i]->b_size       = bh->b_size;
+               mirror_bh[i]->b_data       = bh->b_data;
+               mirror_bh[i]->b_list       = BUF_LOCKED;
+               mirror_bh[i]->b_end_io     = raid1_end_request;
+               mirror_bh[i]->b_dev_id     = r1_bh;
+  
+               r1_bh->mirror_bh[i] = mirror_bh[i];
+               sum_bhs++;
+       }
+
+       md_atomic_set(&r1_bh->remaining, sum_bhs);
+
        /*
-        * We should use a private pool (size depending on NR_REQUEST),
-        * to avoid writes filling up the memory with bhs
-        *
-        * Such pools are much faster than kmalloc anyways (so we waste almost 
-        * nothing by not using the master bh when writing and win alot of cleanness)
-        *
-        * but for now we are cool enough. --mingo
-        *
-        * It's safe to sleep here, buffer heads cannot be used in a shared
-        * manner in the write branch. Look how we lock the buffer at the beginning
-        * of this function to grok the difference ;)
-        */
-               while (!( /* FIXME: now we are rather fault tolerant than nice */
-               mirror_bh[i] = kmalloc (sizeof (struct buffer_head), GFP_BUFFER)
-               ) )
-               {
-                       printk ("raid1_make_request(#2): out of memory\n");
-                       current->policy |= SCHED_YIELD;
-                       schedule();
-               }
-               memset (mirror_bh[i], 0, sizeof (struct buffer_head));
-
-       /*
-        * prepare mirrored bh (fields ordered for max mem throughput):
-        */
-               mirror_bh [i]->b_blocknr    = bh->b_blocknr;
-               mirror_bh [i]->b_dev        = bh->b_dev;
-               mirror_bh [i]->b_rdev       = raid_conf->mirrors [i].dev;
-               mirror_bh [i]->b_rsector    = bh->b_rsector;
-               mirror_bh [i]->b_state      = (1<<BH_Req) | (1<<BH_Dirty);
-               mirror_bh [i]->b_count      = 1;
-               mirror_bh [i]->b_size       = bh->b_size;
-               mirror_bh [i]->b_data       = bh->b_data;
-               mirror_bh [i]->b_list       = BUF_LOCKED;
-               mirror_bh [i]->b_end_io     = raid1_end_request;
-               mirror_bh [i]->b_dev_id     = r1_bh;
-
-               r1_bh->mirror_bh[i] = mirror_bh[i];
-               sum_bhs++;
-       }
-
-       r1_bh->remaining = sum_bhs;
-
-       PRINTK(("raid1_make_request(), write branch, sum_bhs=%d.\n",sum_bhs));
-
-       /*
-        * We have to be a bit careful about the semaphore above, thats why we
-        * start the requests separately. Since kmalloc() could fail, sleep and
-        * make_request() can sleep too, this is the safer solution. Imagine,
-        * end_request decreasing the semaphore before we could have set it up ...
-        * We could play tricks with the semaphore (presetting it and correcting
-        * at the end if sum_bhs is not 'n' but we have to do end_request by hand
-        * if all requests finish until we had a chance to set up the semaphore
-        * correctly ... lots of races).
-        */
-       for (i = 0; i < n; i++)
-               if (mirror_bh [i] != NULL)
-                       map_and_make_request (rw, mirror_bh [i]);
+        * We have to be a bit careful about the semaphore above, thats
+        * why we start the requests separately. Since kmalloc() could
+        * fail, sleep and make_request() can sleep too, this is the
+        * safer solution. Imagine, end_request decreasing the semaphore
+        * before we could have set it up ... We could play tricks with
+        * the semaphore (presetting it and correcting at the end if
+        * sum_bhs is not 'n' but we have to do end_request by hand if
+        * all requests finish until we had a chance to set up the
+        * semaphore correctly ... lots of races).
+        */
+       for (i = 0; i < disks; i++)
+               if (mirror_bh[i])
+                       map_and_make_request(rw, mirror_bh[i]);
 
        return (0);
 }
                           
-static int raid1_status (char *page, int minor, struct md_dev *mddev)
+static int raid1_status (char *page, mddev_t *mddev)
 {
-       struct raid1_data *raid_conf = (struct raid1_data *) mddev->private;
+       raid1_conf_t *conf = mddev_to_conf(mddev);
        int sz = 0, i;
        
-       sz += sprintf (page+sz, " [%d/%d] [", raid_conf->raid_disks, raid_conf->working_disks);
-       for (i = 0; i < raid_conf->raid_disks; i++)
-               sz += sprintf (page+sz, "%s", raid_conf->mirrors [i].operational ? "U" : "_");
+       sz += sprintf (page+sz, " [%d/%d] [", conf->raid_disks,
+                                                conf->working_disks);
+       for (i = 0; i < conf->raid_disks; i++)
+               sz += sprintf (page+sz, "%s",
+                       conf->mirrors[i].operational ? "U" : "_");
        sz += sprintf (page+sz, "]");
        return sz;
 }
 
-static void raid1_fix_links (struct raid1_data *raid_conf, int failed_index)
+static void unlink_disk (raid1_conf_t *conf, int target)
 {
-       int disks = raid_conf->raid_disks;
-       int j;
+       int disks = MD_SB_DISKS;
+       int i;
 
-       for (j = 0; j < disks; j++)
-               if (raid_conf->mirrors [j].next == failed_index)
-                       raid_conf->mirrors [j].next = raid_conf->mirrors [failed_index].next;
+       for (i = 0; i < disks; i++)
+               if (conf->mirrors[i].next == target)
+                       conf->mirrors[i].next = conf->mirrors[target].next;
 }
 
 #define LAST_DISK KERN_ALERT \
@@ -388,48 +390,53 @@
 #define ALREADY_SYNCING KERN_INFO \
 "raid1: syncing already in progress.\n"
 
-static int raid1_error (struct md_dev *mddev, kdev_t dev)
+static void mark_disk_bad (mddev_t *mddev, int failed)
 {
-       struct raid1_data *raid_conf = (struct raid1_data *) mddev->private;
-       struct mirror_info *mirror;
-       md_superblock_t *sb = mddev->sb;
-       int disks = raid_conf->raid_disks;
-       int i;
+       raid1_conf_t *conf = mddev_to_conf(mddev);
+       struct mirror_info *mirror = conf->mirrors+failed;
+       mdp_super_t *sb = mddev->sb;
+
+       mirror->operational = 0;
+       unlink_disk(conf, failed);
+       mark_disk_faulty(sb->disks+mirror->number);
+       mark_disk_nonsync(sb->disks+mirror->number);
+       mark_disk_inactive(sb->disks+mirror->number);
+       sb->active_disks--;
+       sb->working_disks--;
+       sb->failed_disks++;
+       mddev->sb_dirty = 1;
+       md_wakeup_thread(conf->thread);
+       conf->working_disks--;
+       printk (DISK_FAILED, partition_name (mirror->dev),
+                                conf->working_disks);
+}
 
-       PRINTK(("raid1_error called\n"));
+static int raid1_error (mddev_t *mddev, kdev_t dev)
+{
+       raid1_conf_t *conf = mddev_to_conf(mddev);
+       struct mirror_info * mirrors = conf->mirrors;
+       int disks = MD_SB_DISKS;
+       int i;
 
-       if (raid_conf->working_disks == 1) {
+       if (conf->working_disks == 1) {
                /*
                 * Uh oh, we can do nothing if this is our last disk, but
                 * first check if this is a queued request for a device
                 * which has just failed.
                 */
-               for (i = 0, mirror = raid_conf->mirrors; i < disks;
-                                i++, mirror++)
-                       if (mirror->dev == dev && !mirror->operational)
+               for (i = 0; i < disks; i++) {
+                       if (mirrors[i].dev==dev && !mirrors[i].operational)
                                return 0;
+               }
                printk (LAST_DISK);
        } else {
-               /* Mark disk as unusable */
-               for (i = 0, mirror = raid_conf->mirrors; i < disks;
-                                i++, mirror++) {
-                       if (mirror->dev == dev && mirror->operational){
-                               mirror->operational = 0;
-                               raid1_fix_links (raid_conf, i);
-                               sb->disks[mirror->number].state |=
-                                               (1 << MD_FAULTY_DEVICE);
-                               sb->disks[mirror->number].state &=
-                                               ~(1 << MD_SYNC_DEVICE);
-                               sb->disks[mirror->number].state &=
-                                               ~(1 << MD_ACTIVE_DEVICE);
-                               sb->active_disks--;
-                               sb->working_disks--;
-                               sb->failed_disks++;
-                               mddev->sb_dirty = 1;
-                               md_wakeup_thread(raid1_thread);
-                               raid_conf->working_disks--;
-                               printk (DISK_FAILED, kdevname (dev),
-                                               raid_conf->working_disks);
+               /*
+                * Mark disk as unusable
+                */
+               for (i = 0; i < disks; i++) {
+                       if (mirrors[i].dev==dev && mirrors[i].operational) {
+                               mark_disk_bad (mddev, i);
+                               break;
                        }
                }
        }
@@ -442,219 +449,396 @@
 #undef START_SYNCING
 
 /*
- * This is the personality-specific hot-addition routine
+ * Insert the spare disk into the drive-ring
  */
+static void link_disk(raid1_conf_t *conf, struct mirror_info *mirror)
+{
+       int j, next;
+       int disks = MD_SB_DISKS;
+       struct mirror_info *p = conf->mirrors;
 
-#define NO_SUPERBLOCK KERN_ERR \
-"raid1: cannot hot-add disk to the array with no RAID superblock\n"
+       for (j = 0; j < disks; j++, p++)
+               if (p->operational && !p->write_only) {
+                       next = p->next;
+                       p->next = mirror->raid_disk;
+                       mirror->next = next;
+                       return;
+               }
 
-#define WRONG_LEVEL KERN_ERR \
-"raid1: hot-add: level of disk is not RAID-1\n"
+       printk("raid1: bug: no read-operational devices\n");
+}
 
-#define HOT_ADD_SUCCEEDED KERN_INFO \
-"raid1: device %s hot-added\n"
+static void print_raid1_conf (raid1_conf_t *conf)
+{
+       int i;
+       struct mirror_info *tmp;
 
-static int raid1_hot_add_disk (struct md_dev *mddev, kdev_t dev)
+       printk("RAID1 conf printout:\n");
+       if (!conf) {
+               printk("(conf==NULL)\n");
+               return;
+       }
+       printk(" --- wd:%d rd:%d nd:%d\n", conf->working_disks,
+                        conf->raid_disks, conf->nr_disks);
+
+       for (i = 0; i < MD_SB_DISKS; i++) {
+               tmp = conf->mirrors + i;
+               printk(" disk %d, s:%d, o:%d, n:%d rd:%d us:%d dev:%s\n",
+                       i, tmp->spare,tmp->operational,
+                       tmp->number,tmp->raid_disk,tmp->used_slot,
+                       partition_name(tmp->dev));
+       }
+}
+
+static int raid1_diskop(mddev_t *mddev, mdp_disk_t **d, int state)
 {
+       int err = 0;
+       int i, failed_disk=-1, spare_disk=-1, removed_disk=-1, added_disk=-1;
+       raid1_conf_t *conf = mddev->private;
+       struct mirror_info *tmp, *sdisk, *fdisk, *rdisk, *adisk;
        unsigned long flags;
-       struct raid1_data *raid_conf = (struct raid1_data *) mddev->private;
-       struct mirror_info *mirror;
-       md_superblock_t *sb = mddev->sb;
-       struct real_dev * realdev;
-       int n;
+       mdp_super_t *sb = mddev->sb;
+       mdp_disk_t *failed_desc, *spare_desc, *added_desc;
+
+       save_flags(flags);
+       cli();
 
+       print_raid1_conf(conf);
        /*
-        * The device has its superblock already read and it was found
-        * to be consistent for generic RAID usage.  Now we check whether
-        * it's usable for RAID-1 hot addition.
+        * find the disk ...
         */
+       switch (state) {
 
-       n = mddev->nb_dev++;
-       realdev = &mddev->devices[n];
-       if (!realdev->sb) {
-               printk (NO_SUPERBLOCK);
-               return -EINVAL;
-       }
-       if (realdev->sb->level != 1) {
-               printk (WRONG_LEVEL);
-               return -EINVAL;
+       case DISKOP_SPARE_ACTIVE:
+
+               /*
+                * Find the failed disk within the RAID1 configuration ...
+                * (this can only be in the first conf->working_disks part)
+                */
+               for (i = 0; i < conf->raid_disks; i++) {
+                       tmp = conf->mirrors + i;
+                       if ((!tmp->operational && !tmp->spare) ||
+                                       !tmp->used_slot) {
+                               failed_disk = i;
+                               break;
+                       }
+               }
+               /*
+                * When we activate a spare disk we _must_ have a disk in
+                * the lower (active) part of the array to replace. 
+                */
+               if ((failed_disk == -1) || (failed_disk >= conf->raid_disks)) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+               /* fall through */
+
+       case DISKOP_SPARE_WRITE:
+       case DISKOP_SPARE_INACTIVE:
+
+               /*
+                * Find the spare disk ... (can only be in the 'high'
+                * area of the array)
+                */
+               for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+                       tmp = conf->mirrors + i;
+                       if (tmp->spare && tmp->number == (*d)->number) {
+                               spare_disk = i;
+                               break;
+                       }
+               }
+               if (spare_disk == -1) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+               break;
+
+       case DISKOP_HOT_REMOVE_DISK:
+
+               for (i = 0; i < MD_SB_DISKS; i++) {
+                       tmp = conf->mirrors + i;
+                       if (tmp->used_slot && (tmp->number == (*d)->number)) {
+                               if (tmp->operational) {
+                                       err = -EBUSY;
+                                       goto abort;
+                               }
+                               removed_disk = i;
+                               break;
+                       }
+               }
+               if (removed_disk == -1) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+               break;
+
+       case DISKOP_HOT_ADD_DISK:
+
+               for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+                       tmp = conf->mirrors + i;
+                       if (!tmp->used_slot) {
+                               added_disk = i;
+                               break;
+                       }
+               }
+               if (added_disk == -1) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+               break;
        }
-       /* FIXME: are there other things left we could sanity-check? */
 
+       switch (state) {
        /*
-        * We have to disable interrupts, as our RAID-1 state is used
-        * from irq handlers as well.
+        * Switch the spare disk to write-only mode:
         */
-       save_flags(flags);
-       cli();
+       case DISKOP_SPARE_WRITE:
+               sdisk = conf->mirrors + spare_disk;
+               sdisk->operational = 1;
+               sdisk->write_only = 1;
+               break;
+       /*
+        * Deactivate a spare disk:
+        */
+       case DISKOP_SPARE_INACTIVE:
+               sdisk = conf->mirrors + spare_disk;
+               sdisk->operational = 0;
+               sdisk->write_only = 0;
+               break;
+       /*
+        * Activate (mark read-write) the (now sync) spare disk,
+        * which means we switch it's 'raid position' (->raid_disk)
+        * with the failed disk. (only the first 'conf->nr_disks'
+        * slots are used for 'real' disks and we must preserve this
+        * property)
+        */
+       case DISKOP_SPARE_ACTIVE:
 
-       raid_conf->raid_disks++;
-       mirror = raid_conf->mirrors+n;
+               sdisk = conf->mirrors + spare_disk;
+               fdisk = conf->mirrors + failed_disk;
 
-       mirror->number=n;
-       mirror->raid_disk=n;
-       mirror->dev=dev;
-       mirror->next=0; /* FIXME */
-       mirror->sect_limit=128;
-
-       mirror->operational=0;
-       mirror->spare=1;
-       mirror->write_only=0;
-
-       sb->disks[n].state |= (1 << MD_FAULTY_DEVICE);
-       sb->disks[n].state &= ~(1 << MD_SYNC_DEVICE);
-       sb->disks[n].state &= ~(1 << MD_ACTIVE_DEVICE);
-       sb->nr_disks++;
-       sb->spare_disks++;
+               spare_desc = &sb->disks[sdisk->number];
+               failed_desc = &sb->disks[fdisk->number];
 
-       restore_flags(flags);
+               if (spare_desc != *d) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
 
-       md_update_sb(MINOR(dev));
+               if (spare_desc->raid_disk != sdisk->raid_disk) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+                       
+               if (sdisk->raid_disk != spare_disk) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
 
-       printk (HOT_ADD_SUCCEEDED, kdevname(realdev->dev));
+               if (failed_desc->raid_disk != fdisk->raid_disk) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
 
-       return 0;
-}
+               if (fdisk->raid_disk != failed_disk) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
 
-#undef NO_SUPERBLOCK
-#undef WRONG_LEVEL
-#undef HOT_ADD_SUCCEEDED
+               /*
+                * do the switch finally
+                */
+               xchg_values(*spare_desc, *failed_desc);
+               xchg_values(*fdisk, *sdisk);
 
-/*
- * Insert the spare disk into the drive-ring
- */
-static void add_ring(struct raid1_data *raid_conf, struct mirror_info *mirror)
-{
-       int j, next;
-       struct mirror_info *p = raid_conf->mirrors;
+               /*
+                * (careful, 'failed' and 'spare' are switched from now on)
+                *
+                * we want to preserve linear numbering and we want to
+                * give the proper raid_disk number to the now activated
+                * disk. (this means we switch back these values)
+                */
+       
+               xchg_values(spare_desc->raid_disk, failed_desc->raid_disk);
+               xchg_values(sdisk->raid_disk, fdisk->raid_disk);
+               xchg_values(spare_desc->number, failed_desc->number);
+               xchg_values(sdisk->number, fdisk->number);
 
-       for (j = 0; j < raid_conf->raid_disks; j++, p++)
-               if (p->operational && !p->write_only) {
-                       next = p->next;
-                       p->next = mirror->raid_disk;
-                       mirror->next = next;
-                       return;
-               }
-       printk("raid1: bug: no read-operational devices\n");
-}
+               *d = failed_desc;
 
-static int raid1_mark_spare(struct md_dev *mddev, md_descriptor_t *spare,
-                               int state)
-{
-       int i = 0, failed_disk = -1;
-       struct raid1_data *raid_conf = mddev->private;
-       struct mirror_info *mirror = raid_conf->mirrors;
-       md_descriptor_t *descriptor;
-       unsigned long flags;
+               if (sdisk->dev == MKDEV(0,0))
+                       sdisk->used_slot = 0;
+               /*
+                * this really activates the spare.
+                */
+               fdisk->spare = 0;
+               fdisk->write_only = 0;
+               link_disk(conf, fdisk);
 
-       for (i = 0; i < MD_SB_DISKS; i++, mirror++) {
-               if (mirror->spare && mirror->number == spare->number)
-                       goto found;
-       }
-       return 1;
-found:
-       for (i = 0, mirror = raid_conf->mirrors; i < raid_conf->raid_disks;
-                                                               i++, mirror++)
-               if (!mirror->operational)
-                       failed_disk = i;
+               /*
+                * if we activate a spare, we definitely replace a
+                * non-operational disk slot in the 'low' area of
+                * the disk array.
+                */
 
-       save_flags(flags);
-       cli();
-       switch (state) {
-               case SPARE_WRITE:
-                       mirror->operational = 1;
-                       mirror->write_only = 1;
-                       raid_conf->raid_disks = MAX(raid_conf->raid_disks,
-                                                       mirror->raid_disk + 1);
-                       break;
-               case SPARE_INACTIVE:
-                       mirror->operational = 0;
-                       mirror->write_only = 0;
-                       break;
-               case SPARE_ACTIVE:
-                       mirror->spare = 0;
-                       mirror->write_only = 0;
-                       raid_conf->working_disks++;
-                       add_ring(raid_conf, mirror);
-
-                       if (failed_disk != -1) {
-                               descriptor = &mddev->sb->disks[raid_conf->mirrors[failed_disk].number];
-                               i = spare->raid_disk;
-                               spare->raid_disk = descriptor->raid_disk;
-                               descriptor->raid_disk = i;
-                       }
-                       break;
-               default:
-                       printk("raid1_mark_spare: bug: state == %d\n", state);
-                       restore_flags(flags);
-                       return 1;
+               conf->working_disks++;
+
+               break;
+
+       case DISKOP_HOT_REMOVE_DISK:
+               rdisk = conf->mirrors + removed_disk;
+
+               if (rdisk->spare && (removed_disk < conf->raid_disks)) {
+                       MD_BUG();       
+                       err = 1;
+                       goto abort;
+               }
+               rdisk->dev = MKDEV(0,0);
+               rdisk->used_slot = 0;
+               conf->nr_disks--;
+               break;
+
+       case DISKOP_HOT_ADD_DISK:
+               adisk = conf->mirrors + added_disk;
+               added_desc = *d;
+
+               if (added_disk != added_desc->number) {
+                       MD_BUG();       
+                       err = 1;
+                       goto abort;
+               }
+
+               adisk->number = added_desc->number;
+               adisk->raid_disk = added_desc->raid_disk;
+               adisk->dev = MKDEV(added_desc->major,added_desc->minor);
+
+               adisk->operational = 0;
+               adisk->write_only = 0;
+               adisk->spare = 1;
+               adisk->used_slot = 1;
+               conf->nr_disks++;
+
+               break;
+
+       default:
+               MD_BUG();       
+               err = 1;
+               goto abort;
        }
+abort:
        restore_flags(flags);
-       return 0;
+       print_raid1_conf(conf);
+       return err;
 }
 
+
+#define IO_ERROR KERN_ALERT \
+"raid1: %s: unrecoverable I/O read error for block %lu\n"
+
+#define REDIRECT_SECTOR KERN_ERR \
+"raid1: %s: redirecting sector %lu to another mirror\n"
+
 /*
  * This is a kernel thread which:
  *
  *     1.      Retries failed read operations on working mirrors.
  *     2.      Updates the raid superblock when problems encounter.
  */
-void raid1d (void *data)
+static void raid1d (void *data)
 {
        struct buffer_head *bh;
        kdev_t dev;
        unsigned long flags;
-       struct raid1_bh * r1_bh;
-       struct md_dev *mddev;
+       struct raid1_bh *r1_bh;
+       mddev_t *mddev;
 
-       PRINTK(("raid1d() active\n"));
-       save_flags(flags);
-       cli();
        while (raid1_retry_list) {
+               save_flags(flags);
+               cli();
                bh = raid1_retry_list;
                r1_bh = (struct raid1_bh *)(bh->b_dev_id);
                raid1_retry_list = r1_bh->next_retry;
                restore_flags(flags);
 
-               mddev = md_dev + MINOR(bh->b_dev);
+               mddev = kdev_to_mddev(bh->b_dev);
                if (mddev->sb_dirty) {
-                       printk("dirty sb detected, updating.\n");
+                       printk(KERN_INFO "dirty sb detected, updating.\n");
                        mddev->sb_dirty = 0;
-                       md_update_sb(MINOR(bh->b_dev));
+                       md_update_sb(mddev);
                }
                dev = bh->b_rdev;
-               __raid1_map (md_dev + MINOR(bh->b_dev), &bh->b_rdev, &bh->b_rsector, bh->b_size >> 9);
+               __raid1_map (mddev, &bh->b_rdev, &bh->b_rsector,
+                                                        bh->b_size >> 9);
                if (bh->b_rdev == dev) {
-                       printk (KERN_ALERT 
-                                       "raid1: %s: unrecoverable I/O read error for block %lu\n",
-                                               kdevname(bh->b_dev), bh->b_blocknr);
-                       raid1_end_buffer_io(r1_bh, 0);
+                       printk (IO_ERROR, partition_name(bh->b_dev), bh->b_blocknr);
+                       raid1_end_bh_io(r1_bh, 0);
                } else {
-                       printk (KERN_ERR "raid1: %s: redirecting sector %lu to another mirror\n", 
-                                         kdevname(bh->b_dev), bh->b_blocknr);
+                       printk (REDIRECT_SECTOR,
+                               partition_name(bh->b_dev), bh->b_blocknr);
                        map_and_make_request (r1_bh->cmd, bh);
                }
-               cli();
        }
-       restore_flags(flags);
+}
+#undef IO_ERROR
+#undef REDIRECT_SECTOR
+
+/*
+ * Private kernel thread to reconstruct mirrors after an unclean
+ * shutdown.
+ */
+static void raid1syncd (void *data)
+{
+        raid1_conf_t *conf = data;
+        mddev_t *mddev = conf->mddev;
+
+        if (!conf->resync_mirrors)
+                return;
+        if (conf->resync_mirrors == 2)
+                return;
+       down(&mddev->recovery_sem);
+        if (md_do_sync(mddev, NULL)) {
+               up(&mddev->recovery_sem);
+               return;
+       }
+       /*
+        * Only if everything went Ok.
+        */
+        conf->resync_mirrors = 0;
+       up(&mddev->recovery_sem);
 }
 
+
 /*
  * This will catch the scenario in which one of the mirrors was
  * mounted as a normal device rather than as a part of a raid set.
+ *
+ * check_consistency is very personality-dependent, eg. RAID5 cannot
+ * do this check, it uses another method.
  */
-static int __check_consistency (struct md_dev *mddev, int row)
+static int __check_consistency (mddev_t *mddev, int row)
 {
-       struct raid1_data *raid_conf = mddev->private;
+       raid1_conf_t *conf = mddev_to_conf(mddev);
+       int disks = MD_SB_DISKS;
        kdev_t dev;
        struct buffer_head *bh = NULL;
        int i, rc = 0;
        char *buffer = NULL;
 
-       for (i = 0; i < raid_conf->raid_disks; i++) {
-               if (!raid_conf->mirrors[i].operational)
+       for (i = 0; i < disks; i++) {
+               printk("(checking disk %d)\n",i);
+               if (!conf->mirrors[i].operational)
                        continue;
-               dev = raid_conf->mirrors[i].dev;
+               printk("(really checking disk %d)\n",i);
+               dev = conf->mirrors[i].dev;
                set_blocksize(dev, 4096);
                if ((bh = bread(dev, row / 4, 4096)) == NULL)
                        break;
@@ -683,167 +867,342 @@
        return rc;
 }
 
-static int check_consistency (struct md_dev *mddev)
+static int check_consistency (mddev_t *mddev)
 {
-       int size = mddev->sb->size;
-       int row;
+       if (__check_consistency(mddev, 0))
+/*
+ * we do not do this currently, as it's perfectly possible to
+ * have an inconsistent array when it's freshly created. Only
+ * newly written data has to be consistent.
+ */
+               return 0;
 
-       for (row = 0; row < size; row += size / 8)
-               if (__check_consistency(mddev, row))
-                       return 1;
        return 0;
 }
 
-static int raid1_run (int minor, struct md_dev *mddev)
+#define INVALID_LEVEL KERN_WARNING \
+"raid1: md%d: raid level not set to mirroring (%d)\n"
+
+#define NO_SB KERN_ERR \
+"raid1: disabled mirror %s (couldn't access raid superblock)\n"
+
+#define ERRORS KERN_ERR \
+"raid1: disabled mirror %s (errors detected)\n"
+
+#define NOT_IN_SYNC KERN_ERR \
+"raid1: disabled mirror %s (not in sync)\n"
+
+#define INCONSISTENT KERN_ERR \
+"raid1: disabled mirror %s (inconsistent descriptor)\n"
+
+#define ALREADY_RUNNING KERN_ERR \
+"raid1: disabled mirror %s (mirror %d already operational)\n"
+
+#define OPERATIONAL KERN_INFO \
+"raid1: device %s operational as mirror %d\n"
+
+#define MEM_ERROR KERN_ERR \
+"raid1: couldn't allocate memory for md%d\n"
+
+#define SPARE KERN_INFO \
+"raid1: spare disk %s\n"
+
+#define NONE_OPERATIONAL KERN_ERR \
+"raid1: no operational mirrors for md%d\n"
+
+#define RUNNING_CKRAID KERN_ERR \
+"raid1: detected mirror differences -- running resync\n"
+
+#define ARRAY_IS_ACTIVE KERN_INFO \
+"raid1: raid set md%d active with %d out of %d mirrors\n"
+
+#define THREAD_ERROR KERN_ERR \
+"raid1: couldn't allocate thread for md%d\n"
+
+#define START_RESYNC KERN_WARNING \
+"raid1: raid set md%d not clean; reconstructing mirrors\n"
+
+static int raid1_run (mddev_t *mddev)
 {
-       struct raid1_data *raid_conf;
-       int i, j, raid_disk;
-       md_superblock_t *sb = mddev->sb;
-       md_descriptor_t *descriptor;
-       struct real_dev *realdev;
+       raid1_conf_t *conf;
+       int i, j, disk_idx;
+       struct mirror_info *disk;
+       mdp_super_t *sb = mddev->sb;
+       mdp_disk_t *descriptor;
+       mdk_rdev_t *rdev;
+       struct md_list_head *tmp;
+       int start_recovery = 0;
 
        MOD_INC_USE_COUNT;
 
        if (sb->level != 1) {
-               printk("raid1: %s: raid level not set to mirroring (%d)\n",
-                               kdevname(MKDEV(MD_MAJOR, minor)), sb->level);
-               MOD_DEC_USE_COUNT;
-               return -EIO;
-       }
-       /****
-        * copy the now verified devices into our private RAID1 bookkeeping
-        * area. [whatever we allocate in raid1_run(), should be freed in
-        * raid1_stop()]
+               printk(INVALID_LEVEL, mdidx(mddev), sb->level);
+               goto out;
+       }
+       /*
+        * copy the already verified devices into our private RAID1
+        * bookkeeping area. [whatever we allocate in raid1_run(),
+        * should be freed in raid1_stop()]
         */
 
-       while (!( /* FIXME: now we are rather fault tolerant than nice */
-       mddev->private = kmalloc (sizeof (struct raid1_data), GFP_KERNEL)
-       ) )
-       {
-               printk ("raid1_run(): out of memory\n");
-               current->policy |= SCHED_YIELD;
-               schedule();
-       }
-       raid_conf = mddev->private;
-       memset(raid_conf, 0, sizeof(*raid_conf));
-
-       PRINTK(("raid1_run(%d) called.\n", minor));
-
-       for (i = 0; i < mddev->nb_dev; i++) {
-               realdev = &mddev->devices[i];
-               if (!realdev->sb) {
-                       printk(KERN_ERR "raid1: disabled mirror %s (couldn't access raid superblock)\n", kdevname(realdev->dev));
+       conf = raid1_kmalloc(sizeof(raid1_conf_t));
+       mddev->private = conf;
+       if (!conf) {
+               printk(MEM_ERROR, mdidx(mddev));
+               goto out;
+       }
+
+       ITERATE_RDEV(mddev,rdev,tmp) {
+               if (rdev->faulty) {
+                       printk(ERRORS, partition_name(rdev->dev));
+               } else {
+                       if (!rdev->sb) {
+                               MD_BUG();
+                               continue;
+                       }
+               }
+               if (rdev->desc_nr == -1) {
+                       MD_BUG();
                        continue;
                }
-
-               /*
-                * This is important -- we are using the descriptor on
-                * the disk only to get a pointer to the descriptor on
-                * the main superblock, which might be more recent.
-                */
-               descriptor = &sb->disks[realdev->sb->descriptor.number];
-               if (descriptor->state & (1 << MD_FAULTY_DEVICE)) {
-                       printk(KERN_ERR "raid1: disabled mirror %s (errors detected)\n", kdevname(realdev->dev));
+               descriptor = &sb->disks[rdev->desc_nr];
+               disk_idx = descriptor->raid_disk;
+               disk = conf->mirrors + disk_idx;
+
+               if (disk_faulty(descriptor)) {
+                       disk->number = descriptor->number;
+                       disk->raid_disk = disk_idx;
+                       disk->dev = rdev->dev;
+                       disk->sect_limit = MAX_LINEAR_SECTORS;
+                       disk->operational = 0;
+                       disk->write_only = 0;
+                       disk->spare = 0;
+                       disk->used_slot = 1;
                        continue;
                }
-               if (descriptor->state & (1 << MD_ACTIVE_DEVICE)) {
-                       if (!(descriptor->state & (1 << MD_SYNC_DEVICE))) {
-                               printk(KERN_ERR "raid1: disabled mirror %s (not in sync)\n", kdevname(realdev->dev));
+               if (disk_active(descriptor)) {
+                       if (!disk_sync(descriptor)) {
+                               printk(NOT_IN_SYNC,
+                                       partition_name(rdev->dev));
                                continue;
                        }
-                       raid_disk = descriptor->raid_disk;
-                       if (descriptor->number > sb->nr_disks || raid_disk > sb->raid_disks) {
-                               printk(KERN_ERR "raid1: disabled mirror %s (inconsistent descriptor)\n", kdevname(realdev->dev));
+                       if ((descriptor->number > MD_SB_DISKS) ||
+                                        (disk_idx > sb->raid_disks)) {
+
+                               printk(INCONSISTENT,
+                                       partition_name(rdev->dev));
                                continue;
                        }
-                       if (raid_conf->mirrors[raid_disk].operational) {
-                               printk(KERN_ERR "raid1: disabled mirror %s (mirror %d already operational)\n", kdevname(realdev->dev), raid_disk);
+                       if (disk->operational) {
+                               printk(ALREADY_RUNNING,
+                                       partition_name(rdev->dev),
+                                       disk_idx);
                                continue;
                        }
-                       printk(KERN_INFO "raid1: device %s operational as mirror %d\n", kdevname(realdev->dev), raid_disk);
-                       raid_conf->mirrors[raid_disk].number = descriptor->number;
-                       raid_conf->mirrors[raid_disk].raid_disk = raid_disk;
-                       raid_conf->mirrors[raid_disk].dev = mddev->devices [i].dev;
-                       raid_conf->mirrors[raid_disk].operational = 1;
-                       raid_conf->mirrors[raid_disk].sect_limit = 128;
-                       raid_conf->working_disks++;
+                       printk(OPERATIONAL, partition_name(rdev->dev),
+                                       disk_idx);
+                       disk->number = descriptor->number;
+                       disk->raid_disk = disk_idx;
+                       disk->dev = rdev->dev;
+                       disk->sect_limit = MAX_LINEAR_SECTORS;
+                       disk->operational = 1;
+                       disk->write_only = 0;
+                       disk->spare = 0;
+                       disk->used_slot = 1;
+                       conf->working_disks++;
                } else {
                /*
                 * Must be a spare disk ..
                 */
-                       printk(KERN_INFO "raid1: spare disk %s\n", kdevname(realdev->dev));
-                       raid_disk = descriptor->raid_disk;
-                       raid_conf->mirrors[raid_disk].number = descriptor->number;
-                       raid_conf->mirrors[raid_disk].raid_disk = raid_disk;
-                       raid_conf->mirrors[raid_disk].dev = mddev->devices [i].dev;
-                       raid_conf->mirrors[raid_disk].sect_limit = 128;
-
-                       raid_conf->mirrors[raid_disk].operational = 0;
-                       raid_conf->mirrors[raid_disk].write_only = 0;
-                       raid_conf->mirrors[raid_disk].spare = 1;
-               }
-       }
-       if (!raid_conf->working_disks) {
-               printk(KERN_ERR "raid1: no operational mirrors for %s\n", kdevname(MKDEV(MD_MAJOR, minor)));
-               kfree(raid_conf);
-               mddev->private = NULL;
-               MOD_DEC_USE_COUNT;
-               return -EIO;
-       }
-
-       raid_conf->raid_disks = sb->raid_disks;
-       raid_conf->mddev = mddev;
-
-       for (j = 0; !raid_conf->mirrors[j].operational; j++);
-       raid_conf->last_used = j;
-       for (i = raid_conf->raid_disks - 1; i >= 0; i--) {
-               if (raid_conf->mirrors[i].operational) {
-                       PRINTK(("raid_conf->mirrors[%d].next == %d\n", i, j));
-                       raid_conf->mirrors[i].next = j;
+                       printk(SPARE, partition_name(rdev->dev));
+                       disk->number = descriptor->number;
+                       disk->raid_disk = disk_idx;
+                       disk->dev = rdev->dev;
+                       disk->sect_limit = MAX_LINEAR_SECTORS;
+                       disk->operational = 0;
+                       disk->write_only = 0;
+                       disk->spare = 1;
+                       disk->used_slot = 1;
+               }
+       }
+       if (!conf->working_disks) {
+               printk(NONE_OPERATIONAL, mdidx(mddev));
+               goto out_free_conf;
+       }
+
+       conf->raid_disks = sb->raid_disks;
+       conf->nr_disks = sb->nr_disks;
+       conf->mddev = mddev;
+
+       for (i = 0; i < MD_SB_DISKS; i++) {
+               
+               descriptor = sb->disks+i;
+               disk_idx = descriptor->raid_disk;
+               disk = conf->mirrors + disk_idx;
+
+               if (disk_faulty(descriptor) && (disk_idx < conf->raid_disks) &&
+                               !disk->used_slot) {
+
+                       disk->number = descriptor->number;
+                       disk->raid_disk = disk_idx;
+                       disk->dev = MKDEV(0,0);
+
+                       disk->operational = 0;
+                       disk->write_only = 0;
+                       disk->spare = 0;
+                       disk->used_slot = 1;
+               }
+       }
+
+       /*
+        * find the first working one and use it as a starting point
+        * to read balancing.
+        */
+       for (j = 0; !conf->mirrors[j].operational; j++)
+               /* nothing */;
+       conf->last_used = j;
+
+       /*
+        * initialize the 'working disks' list.
+        */
+       for (i = conf->raid_disks - 1; i >= 0; i--) {
+               if (conf->mirrors[i].operational) {
+                       conf->mirrors[i].next = j;
                        j = i;
                }
        }
 
-       if (check_consistency(mddev)) {
-               printk(KERN_ERR "raid1: detected mirror differences -- run ckraid\n");
-               sb->state |= 1 << MD_SB_ERRORS;
-               kfree(raid_conf);
-               mddev->private = NULL;
-               MOD_DEC_USE_COUNT;
-               return -EIO;
+       if (conf->working_disks != sb->raid_disks) {
+               printk(KERN_ALERT "raid1: md%d, not all disks are operational -- trying to recover array\n", mdidx(mddev));
+               start_recovery = 1;
        }
 
+       if (!start_recovery && (sb->state & (1 << MD_SB_CLEAN))) {
+               /*
+                * we do sanity checks even if the device says
+                * it's clean ...
+                */
+               if (check_consistency(mddev)) {
+                       printk(RUNNING_CKRAID);
+                       sb->state &= ~(1 << MD_SB_CLEAN);
+               }
+       }
+
+       {
+               const char * name = "raid1d";
+
+               conf->thread = md_register_thread(raid1d, conf, name);
+               if (!conf->thread) {
+                       printk(THREAD_ERROR, mdidx(mddev));
+                       goto out_free_conf;
+               }
+       }
+
+       if (!start_recovery && !(sb->state & (1 << MD_SB_CLEAN))) {
+               const char * name = "raid1syncd";
+
+               conf->resync_thread = md_register_thread(raid1syncd, conf,name);
+               if (!conf->resync_thread) {
+                       printk(THREAD_ERROR, mdidx(mddev));
+                       goto out_free_conf;
+               }
+
+               printk(START_RESYNC, mdidx(mddev));
+                conf->resync_mirrors = 1;
+                md_wakeup_thread(conf->resync_thread);
+        }
+
        /*
         * Regenerate the "device is in sync with the raid set" bit for
         * each device.
         */
-       for (i = 0; i < sb->nr_disks ; i++) {
-               sb->disks[i].state &= ~(1 << MD_SYNC_DEVICE);
+       for (i = 0; i < MD_SB_DISKS; i++) {
+               mark_disk_nonsync(sb->disks+i);
                for (j = 0; j < sb->raid_disks; j++) {
-                       if (!raid_conf->mirrors[j].operational)
+                       if (!conf->mirrors[j].operational)
                                continue;
-                       if (sb->disks[i].number == raid_conf->mirrors[j].number)
-                               sb->disks[i].state |= 1 << MD_SYNC_DEVICE;
+                       if (sb->disks[i].number == conf->mirrors[j].number)
+                               mark_disk_sync(sb->disks+i);
                }
        }
-       sb->active_disks = raid_conf->working_disks;
+       sb->active_disks = conf->working_disks;
 
-       printk("raid1: raid set %s active with %d out of %d mirrors\n", kdevname(MKDEV(MD_MAJOR, minor)), sb->active_disks, sb->raid_disks);
-       /* Ok, everything is just fine now */
-       return (0);
+       if (start_recovery)
+               md_recover_arrays();
+
+
+       printk(ARRAY_IS_ACTIVE, mdidx(mddev), sb->active_disks, sb->raid_disks);
+       /*
+        * Ok, everything is just fine now
+        */
+       return 0;
+
+out_free_conf:
+       kfree(conf);
+       mddev->private = NULL;
+out:
+       MOD_DEC_USE_COUNT;
+       return -EIO;
+}
+
+#undef INVALID_LEVEL
+#undef NO_SB
+#undef ERRORS
+#undef NOT_IN_SYNC
+#undef INCONSISTENT
+#undef ALREADY_RUNNING
+#undef OPERATIONAL
+#undef SPARE
+#undef NONE_OPERATIONAL
+#undef RUNNING_CKRAID
+#undef ARRAY_IS_ACTIVE
+
+static int raid1_stop_resync (mddev_t *mddev)
+{
+       raid1_conf_t *conf = mddev_to_conf(mddev);
+
+       if (conf->resync_thread) {
+               if (conf->resync_mirrors) {
+                       conf->resync_mirrors = 2;
+                       md_interrupt_thread(conf->resync_thread);
+                       printk(KERN_INFO "raid1: mirror resync was not fully finished, restarting next time.\n");
+                       return 1;
+               }
+               return 0;
+       }
+       return 0;
+}
+
+static int raid1_restart_resync (mddev_t *mddev)
+{
+       raid1_conf_t *conf = mddev_to_conf(mddev);
+
+       if (conf->resync_mirrors) {
+               if (!conf->resync_thread) {
+                       MD_BUG();
+                       return 0;
+               }
+               conf->resync_mirrors = 1;
+               md_wakeup_thread(conf->resync_thread);
+               return 1;
+       }
+       return 0;
 }
 
-static int raid1_stop (int minor, struct md_dev *mddev)
+static int raid1_stop (mddev_t *mddev)
 {
-       struct raid1_data *raid_conf = (struct raid1_data *) mddev->private;
+       raid1_conf_t *conf = mddev_to_conf(mddev);
 
-       kfree (raid_conf);
+       md_unregister_thread(conf->thread);
+       if (conf->resync_thread)
+               md_unregister_thread(conf->resync_thread);
+       kfree(conf);
        mddev->private = NULL;
        MOD_DEC_USE_COUNT;
        return 0;
 }
 
-static struct md_personality raid1_personality=
+static mdk_personality_t raid1_personality=
 {
        "raid1",
        raid1_map,
@@ -855,15 +1214,13 @@
        NULL,                   /* no ioctls */
        0,
        raid1_error,
-       raid1_hot_add_disk,
-       /* raid1_hot_remove_drive */ NULL,
-       raid1_mark_spare
+       raid1_diskop,
+       raid1_stop_resync,
+       raid1_restart_resync
 };
 
 int raid1_init (void)
 {
-       if ((raid1_thread = md_register_thread(raid1d, NULL)) == NULL)
-               return -EBUSY;
        return register_md_personality (RAID1, &raid1_personality);
 }
 
@@ -875,7 +1232,6 @@
 
 void cleanup_module (void)
 {
-       md_unregister_thread (raid1_thread);
        unregister_md_personality (RAID1);
 }
 #endif
--- linux/drivers/block/raid5.c.orig    Fri May  8 09:17:13 1998
+++ linux/drivers/block/raid5.c Tue Jan 16 13:42:04 2001
@@ -1,4 +1,4 @@
-/*****************************************************************************
+/*
  * raid5.c : Multiple Devices driver for Linux
  *           Copyright (C) 1996, 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman
  *
@@ -14,16 +14,15 @@
  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+
 #include <linux/module.h>
 #include <linux/locks.h>
 #include <linux/malloc.h>
-#include <linux/md.h>
-#include <linux/raid5.h>
+#include <linux/raid/raid5.h>
 #include <asm/bitops.h>
 #include <asm/atomic.h>
-#include <asm/md.h>
 
-static struct md_personality raid5_personality;
+static mdk_personality_t raid5_personality;
 
 /*
  * Stripe cache
@@ -33,7 +32,7 @@
 #define HASH_PAGES_ORDER       0
 #define NR_HASH                        (HASH_PAGES * PAGE_SIZE / sizeof(struct stripe_head *))
 #define HASH_MASK              (NR_HASH - 1)
-#define stripe_hash(raid_conf, sect, size)     ((raid_conf)->stripe_hashtbl[((sect) / (size >> 9)) & HASH_MASK])
+#define stripe_hash(conf, sect, size)  ((conf)->stripe_hashtbl[((sect) / (size >> 9)) & HASH_MASK])
 
 /*
  * The following can be used to debug the driver
@@ -46,6 +45,8 @@
 #define PRINTK(x)   do { ; } while (0)
 #endif
 
+static void print_raid5_conf (raid5_conf_t *conf);
+
 static inline int stripe_locked(struct stripe_head *sh)
 {
        return test_bit(STRIPE_LOCKED, &sh->state);
@@ -61,32 +62,32 @@
  */
 static inline void lock_stripe(struct stripe_head *sh)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
-       if (!test_and_set_bit(STRIPE_LOCKED, &sh->state)) {
+       raid5_conf_t *conf = sh->raid_conf;
+       if (!md_test_and_set_bit(STRIPE_LOCKED, &sh->state)) {
                PRINTK(("locking stripe %lu\n", sh->sector));
-               raid_conf->nr_locked_stripes++;
+               conf->nr_locked_stripes++;
        }
 }
 
 static inline void unlock_stripe(struct stripe_head *sh)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
-       if (test_and_clear_bit(STRIPE_LOCKED, &sh->state)) {
+       raid5_conf_t *conf = sh->raid_conf;
+       if (md_test_and_clear_bit(STRIPE_LOCKED, &sh->state)) {
                PRINTK(("unlocking stripe %lu\n", sh->sector));
-               raid_conf->nr_locked_stripes--;
+               conf->nr_locked_stripes--;
                wake_up(&sh->wait);
        }
 }
 
 static inline void finish_stripe(struct stripe_head *sh)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
+       raid5_conf_t *conf = sh->raid_conf;
        unlock_stripe(sh);
        sh->cmd = STRIPE_NONE;
        sh->phase = PHASE_COMPLETE;
-       raid_conf->nr_pending_stripes--;
-       raid_conf->nr_cached_stripes++;
-       wake_up(&raid_conf->wait_for_stripe);
+       conf->nr_pending_stripes--;
+       conf->nr_cached_stripes++;
+       wake_up(&conf->wait_for_stripe);
 }
 
 void __wait_on_stripe(struct stripe_head *sh)
@@ -114,7 +115,7 @@
                __wait_on_stripe(sh);
 }
 
-static inline void remove_hash(struct raid5_data *raid_conf, struct stripe_head *sh)
+static inline void remove_hash(raid5_conf_t *conf, struct stripe_head *sh)
 {
        PRINTK(("remove_hash(), stripe %lu\n", sh->sector));
 
@@ -123,21 +124,22 @@
                        sh->hash_next->hash_pprev = sh->hash_pprev;
                *sh->hash_pprev = sh->hash_next;
                sh->hash_pprev = NULL;
-               raid_conf->nr_hashed_stripes--;
+               conf->nr_hashed_stripes--;
        }
 }
 
-static inline void insert_hash(struct raid5_data *raid_conf, struct stripe_head *sh)
+static inline void insert_hash(raid5_conf_t *conf, struct stripe_head *sh)
 {
-       struct stripe_head **shp = &stripe_hash(raid_conf, sh->sector, sh->size);
+       struct stripe_head **shp = &stripe_hash(conf, sh->sector, sh->size);
 
-       PRINTK(("insert_hash(), stripe %lu, nr_hashed_stripes %d\n", sh->sector, raid_conf->nr_hashed_stripes));
+       PRINTK(("insert_hash(), stripe %lu, nr_hashed_stripes %d\n",
+                       sh->sector, conf->nr_hashed_stripes));
 
        if ((sh->hash_next = *shp) != NULL)
                (*shp)->hash_pprev = &sh->hash_next;
        *shp = sh;
        sh->hash_pprev = shp;
-       raid_conf->nr_hashed_stripes++;
+       conf->nr_hashed_stripes++;
 }
 
 static struct buffer_head *get_free_buffer(struct stripe_head *sh, int b_size)
@@ -145,13 +147,15 @@
        struct buffer_head *bh;
        unsigned long flags;
 
-       save_flags(flags);
-       cli();
-       if ((bh = sh->buffer_pool) == NULL)
-               return NULL;
+       md_spin_lock_irqsave(&sh->stripe_lock, flags);
+       bh = sh->buffer_pool;
+       if (!bh)
+               goto out_unlock;
        sh->buffer_pool = bh->b_next;
        bh->b_size = b_size;
-       restore_flags(flags);
+out_unlock:
+       md_spin_unlock_irqrestore(&sh->stripe_lock, flags);
+
        return bh;
 }
 
@@ -160,12 +164,14 @@
        struct buffer_head *bh;
        unsigned long flags;
 
-       save_flags(flags);
-       cli();
-       if ((bh = sh->bh_pool) == NULL)
-               return NULL;
+       md_spin_lock_irqsave(&sh->stripe_lock, flags);
+       bh = sh->bh_pool;
+       if (!bh)
+               goto out_unlock;
        sh->bh_pool = bh->b_next;
-       restore_flags(flags);
+out_unlock:
+       md_spin_unlock_irqrestore(&sh->stripe_lock, flags);
+
        return bh;
 }
 
@@ -173,54 +179,52 @@
 {
        unsigned long flags;
 
-       save_flags(flags);
-       cli();
+       md_spin_lock_irqsave(&sh->stripe_lock, flags);
        bh->b_next = sh->buffer_pool;
        sh->buffer_pool = bh;
-       restore_flags(flags);
+       md_spin_unlock_irqrestore(&sh->stripe_lock, flags);
 }
 
 static void put_free_bh(struct stripe_head *sh, struct buffer_head *bh)
 {
        unsigned long flags;
 
-       save_flags(flags);
-       cli();
+       md_spin_lock_irqsave(&sh->stripe_lock, flags);
        bh->b_next = sh->bh_pool;
        sh->bh_pool = bh;
-       restore_flags(flags);
+       md_spin_unlock_irqrestore(&sh->stripe_lock, flags);
 }
 
-static struct stripe_head *get_free_stripe(struct raid5_data *raid_conf)
+static struct stripe_head *get_free_stripe(raid5_conf_t *conf)
 {
        struct stripe_head *sh;
        unsigned long flags;
 
        save_flags(flags);
        cli();
-       if ((sh = raid_conf->free_sh_list) == NULL) {
+       if ((sh = conf->free_sh_list) == NULL) {
                restore_flags(flags);
                return NULL;
        }
-       raid_conf->free_sh_list = sh->free_next;
-       raid_conf->nr_free_sh--;
-       if (!raid_conf->nr_free_sh && raid_conf->free_sh_list)
+       conf->free_sh_list = sh->free_next;
+       conf->nr_free_sh--;
+       if (!conf->nr_free_sh && conf->free_sh_list)
                printk ("raid5: bug: free_sh_list != NULL, nr_free_sh == 0\n");
        restore_flags(flags);
-       if (sh->hash_pprev || sh->nr_pending || sh->count)
+       if (sh->hash_pprev || md_atomic_read(&sh->nr_pending) || sh->count)
                printk("get_free_stripe(): bug\n");
        return sh;
 }
 
-static void put_free_stripe(struct raid5_data *raid_conf, struct stripe_head *sh)
+static void put_free_stripe(raid5_conf_t *conf, struct stripe_head *sh)
 {
        unsigned long flags;
 
        save_flags(flags);
        cli();
-       sh->free_next = raid_conf->free_sh_list;
-       raid_conf->free_sh_list = sh;
-       raid_conf->nr_free_sh++;
+       sh->free_next = conf->free_sh_list;
+       conf->free_sh_list = sh;
+       conf->nr_free_sh++;
        restore_flags(flags);
 }
 
@@ -324,8 +328,8 @@
 
 static void kfree_stripe(struct stripe_head *sh)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
-       int disks = raid_conf->raid_disks, j;
+       raid5_conf_t *conf = sh->raid_conf;
+       int disks = conf->raid_disks, j;
 
        PRINTK(("kfree_stripe called, stripe %lu\n", sh->sector));
        if (sh->phase != PHASE_COMPLETE || stripe_locked(sh) || sh->count) {
@@ -338,19 +342,19 @@
                if (sh->bh_new[j] || sh->bh_copy[j])
                        printk("raid5: bug: sector %lu, new %p, copy %p\n", sh->sector, sh->bh_new[j], sh->bh_copy[j]);
        }
-       remove_hash(raid_conf, sh);
-       put_free_stripe(raid_conf, sh);
+       remove_hash(conf, sh);
+       put_free_stripe(conf, sh);
 }
 
-static int shrink_stripe_cache(struct raid5_data *raid_conf, int nr)
+static int shrink_stripe_cache(raid5_conf_t *conf, int nr)
 {
        struct stripe_head *sh;
        int i, count = 0;
 
-       PRINTK(("shrink_stripe_cache called, %d/%d, clock %d\n", nr, raid_conf->nr_hashed_stripes, raid_conf->clock));
+       PRINTK(("shrink_stripe_cache called, %d/%d, clock %d\n", nr, conf->nr_hashed_stripes, conf->clock));
        for (i = 0; i < NR_HASH; i++) {
 repeat:
-               sh = raid_conf->stripe_hashtbl[(i + raid_conf->clock) & HASH_MASK];
+               sh = conf->stripe_hashtbl[(i + conf->clock) & HASH_MASK];
                for (; sh; sh = sh->hash_next) {
                        if (sh->phase != PHASE_COMPLETE)
                                continue;
@@ -360,30 +364,30 @@
                                continue;
                        kfree_stripe(sh);
                        if (++count == nr) {
-                               PRINTK(("shrink completed, nr_hashed_stripes %d\n", raid_conf->nr_hashed_stripes));
-                               raid_conf->clock = (i + raid_conf->clock) & HASH_MASK;
+                               PRINTK(("shrink completed, nr_hashed_stripes %d\n", conf->nr_hashed_stripes));
+                               conf->clock = (i + conf->clock) & HASH_MASK;
                                return nr;
                        }
                        goto repeat;
                }
        }
-       PRINTK(("shrink completed, nr_hashed_stripes %d\n", raid_conf->nr_hashed_stripes));
+       PRINTK(("shrink completed, nr_hashed_stripes %d\n", conf->nr_hashed_stripes));
        return count;
 }
 
-static struct stripe_head *find_stripe(struct raid5_data *raid_conf, unsigned long sector, int size)
+static struct stripe_head *find_stripe(raid5_conf_t *conf, unsigned long sector, int size)
 {
        struct stripe_head *sh;
 
-       if (raid_conf->buffer_size != size) {
-               PRINTK(("switching size, %d --> %d\n", raid_conf->buffer_size, size));
-               shrink_stripe_cache(raid_conf, raid_conf->max_nr_stripes);
-               raid_conf->buffer_size = size;
+       if (conf->buffer_size != size) {
+               PRINTK(("switching size, %d --> %d\n", conf->buffer_size, size));
+               shrink_stripe_cache(conf, conf->max_nr_stripes);
+               conf->buffer_size = size;
        }
 
        PRINTK(("find_stripe, sector %lu\n", sector));
-       for (sh = stripe_hash(raid_conf, sector, size); sh; sh = sh->hash_next)
-               if (sh->sector == sector && sh->raid_conf == raid_conf) {
+       for (sh = stripe_hash(conf, sector, size); sh; sh = sh->hash_next)
+               if (sh->sector == sector && sh->raid_conf == conf) {
                        if (sh->size == size) {
                                PRINTK(("found stripe %lu\n", sector));
                                return sh;
@@ -397,7 +401,7 @@
        return NULL;
 }
 
-static int grow_stripes(struct raid5_data *raid_conf, int num, int priority)
+static int grow_stripes(raid5_conf_t *conf, int num, int priority)
 {
        struct stripe_head *sh;
 
@@ -405,62 +409,64 @@
                if ((sh = kmalloc(sizeof(struct stripe_head), priority)) == NULL)
                        return 1;
                memset(sh, 0, sizeof(*sh));
-               if (grow_buffers(sh, 2 * raid_conf->raid_disks, PAGE_SIZE, priority)) {
-                       shrink_buffers(sh, 2 * raid_conf->raid_disks);
+               sh->stripe_lock = MD_SPIN_LOCK_UNLOCKED;
+
+               if (grow_buffers(sh, 2 * conf->raid_disks, PAGE_SIZE, priority)) {
+                       shrink_buffers(sh, 2 * conf->raid_disks);
                        kfree(sh);
                        return 1;
                }
-               if (grow_bh(sh, raid_conf->raid_disks, priority)) {
-                       shrink_buffers(sh, 2 * raid_conf->raid_disks);
-                       shrink_bh(sh, raid_conf->raid_disks);
+               if (grow_bh(sh, conf->raid_disks, priority)) {
+                       shrink_buffers(sh, 2 * conf->raid_disks);
+                       shrink_bh(sh, conf->raid_disks);
                        kfree(sh);
                        return 1;
                }
-               put_free_stripe(raid_conf, sh);
-               raid_conf->nr_stripes++;
+               put_free_stripe(conf, sh);
+               conf->nr_stripes++;
        }
        return 0;
 }
 
-static void shrink_stripes(struct raid5_data *raid_conf, int num)
+static void shrink_stripes(raid5_conf_t *conf, int num)
 {
        struct stripe_head *sh;
 
        while (num--) {
-               sh = get_free_stripe(raid_conf);
+               sh = get_free_stripe(conf);
                if (!sh)
                        break;
-               shrink_buffers(sh, raid_conf->raid_disks * 2);
-               shrink_bh(sh, raid_conf->raid_disks);
+               shrink_buffers(sh, conf->raid_disks * 2);
+               shrink_bh(sh, conf->raid_disks);
                kfree(sh);
-               raid_conf->nr_stripes--;
+               conf->nr_stripes--;
        }
 }
 
-static struct stripe_head *kmalloc_stripe(struct raid5_data *raid_conf, unsigned long sector, int size)
+static struct stripe_head *kmalloc_stripe(raid5_conf_t *conf, unsigned long sector, int size)
 {
        struct stripe_head *sh = NULL, *tmp;
        struct buffer_head *buffer_pool, *bh_pool;
 
        PRINTK(("kmalloc_stripe called\n"));
 
-       while ((sh = get_free_stripe(raid_conf)) == NULL) {
-               shrink_stripe_cache(raid_conf, raid_conf->max_nr_stripes / 8);
-               if ((sh = get_free_stripe(raid_conf)) != NULL)
+       while ((sh = get_free_stripe(conf)) == NULL) {
+               shrink_stripe_cache(conf, conf->max_nr_stripes / 8);
+               if ((sh = get_free_stripe(conf)) != NULL)
                        break;
-               if (!raid_conf->nr_pending_stripes)
+               if (!conf->nr_pending_stripes)
                        printk("raid5: bug: nr_free_sh == 0, nr_pending_stripes == 0\n");
-               md_wakeup_thread(raid_conf->thread);
+               md_wakeup_thread(conf->thread);
                PRINTK(("waiting for some stripes to complete\n"));
-               sleep_on(&raid_conf->wait_for_stripe);
+               sleep_on(&conf->wait_for_stripe);
        }
 
        /*
         * The above might have slept, so perhaps another process
         * already created the stripe for us..
         */
-       if ((tmp = find_stripe(raid_conf, sector, size)) != NULL) { 
-               put_free_stripe(raid_conf, sh);
+       if ((tmp = find_stripe(conf, sector, size)) != NULL) { 
+               put_free_stripe(conf, sh);
                wait_on_stripe(tmp);
                return tmp;
        }
@@ -472,25 +478,25 @@
                sh->bh_pool = bh_pool;
                sh->phase = PHASE_COMPLETE;
                sh->cmd = STRIPE_NONE;
-               sh->raid_conf = raid_conf;
+               sh->raid_conf = conf;
                sh->sector = sector;
                sh->size = size;
-               raid_conf->nr_cached_stripes++;
-               insert_hash(raid_conf, sh);
+               conf->nr_cached_stripes++;
+               insert_hash(conf, sh);
        } else printk("raid5: bug: kmalloc_stripe() == NULL\n");
        return sh;
 }
 
-static struct stripe_head *get_stripe(struct raid5_data *raid_conf, unsigned long sector, int size)
+static struct stripe_head *get_stripe(raid5_conf_t *conf, unsigned long sector, int size)
 {
        struct stripe_head *sh;
 
        PRINTK(("get_stripe, sector %lu\n", sector));
-       sh = find_stripe(raid_conf, sector, size);
+       sh = find_stripe(conf, sector, size);
        if (sh)
                wait_on_stripe(sh);
        else
-               sh = kmalloc_stripe(raid_conf, sector, size);
+               sh = kmalloc_stripe(conf, sector, size);
        return sh;
 }
 
@@ -523,7 +529,7 @@
        bh->b_end_io(bh, uptodate);
        if (!uptodate)
                printk(KERN_ALERT "raid5: %s: unrecoverable I/O error for "
-                      "block %lu\n", kdevname(bh->b_dev), bh->b_blocknr);
+                      "block %lu\n", partition_name(bh->b_dev), bh->b_blocknr);
 }
 
 static inline void raid5_mark_buffer_uptodate (struct buffer_head *bh, int uptodate)
@@ -537,36 +543,35 @@
 static void raid5_end_request (struct buffer_head * bh, int uptodate)
 {
        struct stripe_head *sh = bh->b_dev_id;
-       struct raid5_data *raid_conf = sh->raid_conf;
-       int disks = raid_conf->raid_disks, i;
+       raid5_conf_t *conf = sh->raid_conf;
+       int disks = conf->raid_disks, i;
        unsigned long flags;
 
        PRINTK(("end_request %lu, nr_pending %d\n", sh->sector, sh->nr_pending));
-       save_flags(flags);
-       cli();
+       md_spin_lock_irqsave(&sh->stripe_lock, flags);
        raid5_mark_buffer_uptodate(bh, uptodate);
-       --sh->nr_pending;
-       if (!sh->nr_pending) {
-               md_wakeup_thread(raid_conf->thread);
-               atomic_inc(&raid_conf->nr_handle);
+       if (atomic_dec_and_test(&sh->nr_pending)) {
+               md_wakeup_thread(conf->thread);
+               atomic_inc(&conf->nr_handle);
        }
-       if (!uptodate)
+       if (!uptodate) {
                md_error(bh->b_dev, bh->b_rdev);
-       if (raid_conf->failed_disks) {
+       }
+       if (conf->failed_disks) {
                for (i = 0; i < disks; i++) {
-                       if (raid_conf->disks[i].operational)
+                       if (conf->disks[i].operational)
                                continue;
                        if (bh != sh->bh_old[i] && bh != sh->bh_req[i] && bh != sh->bh_copy[i])
                                continue;
-                       if (bh->b_rdev != raid_conf->disks[i].dev)
+                       if (bh->b_rdev != conf->disks[i].dev)
                                continue;
                        set_bit(STRIPE_ERROR, &sh->state);
                }
        }
-       restore_flags(flags);
+       md_spin_unlock_irqrestore(&sh->stripe_lock, flags);
 }
 
-static int raid5_map (struct md_dev *mddev, kdev_t *rdev,
+static int raid5_map (mddev_t *mddev, kdev_t dev, kdev_t *rdev,
                      unsigned long *rsector, unsigned long size)
 {
        /* No complex mapping used: the core of the work is done in the
@@ -577,11 +582,10 @@
 
 static void raid5_build_block (struct stripe_head *sh, struct buffer_head *bh, int i)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
-       struct md_dev *mddev = raid_conf->mddev;
-       int minor = (int) (mddev - md_dev);
+       raid5_conf_t *conf = sh->raid_conf;
+       mddev_t *mddev = conf->mddev;
        char *b_data;
-       kdev_t dev = MKDEV(MD_MAJOR, minor);
+       kdev_t dev = mddev_to_kdev(mddev);
        int block = sh->sector / (sh->size >> 9);
 
        b_data = ((volatile struct buffer_head *) bh)->b_data;
@@ -589,7 +593,7 @@
        init_buffer(bh, dev, block, raid5_end_request, sh);
        ((volatile struct buffer_head *) bh)->b_data = b_data;
 
-       bh->b_rdev      = raid_conf->disks[i].dev;
+       bh->b_rdev      = conf->disks[i].dev;
        bh->b_rsector   = sh->sector;
 
        bh->b_state     = (1 << BH_Req);
@@ -597,33 +601,62 @@
        bh->b_list      = BUF_LOCKED;
 }
 
-static int raid5_error (struct md_dev *mddev, kdev_t dev)
+static int raid5_error (mddev_t *mddev, kdev_t dev)
 {
-       struct raid5_data *raid_conf = (struct raid5_data *) mddev->private;
-       md_superblock_t *sb = mddev->sb;
+       raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
+       mdp_super_t *sb = mddev->sb;
        struct disk_info *disk;
        int i;
 
        PRINTK(("raid5_error called\n"));
-       raid_conf->resync_parity = 0;
-       for (i = 0, disk = raid_conf->disks; i < raid_conf->raid_disks; i++, disk++)
+       conf->resync_parity = 0;
+       for (i = 0, disk = conf->disks; i < conf->raid_disks; i++, disk++) {
                if (disk->dev == dev && disk->operational) {
                        disk->operational = 0;
-                       sb->disks[disk->number].state |= (1 << MD_FAULTY_DEVICE);
-                       sb->disks[disk->number].state &= ~(1 << MD_SYNC_DEVICE);
-                       sb->disks[disk->number].state &= ~(1 << MD_ACTIVE_DEVICE);
+                       mark_disk_faulty(sb->disks+disk->number);
+                       mark_disk_nonsync(sb->disks+disk->number);
+                       mark_disk_inactive(sb->disks+disk->number);
                        sb->active_disks--;
                        sb->working_disks--;
                        sb->failed_disks++;
                        mddev->sb_dirty = 1;
-                       raid_conf->working_disks--;
-                       raid_conf->failed_disks++;
-                       md_wakeup_thread(raid_conf->thread);
+                       conf->working_disks--;
+                       conf->failed_disks++;
+                       md_wakeup_thread(conf->thread);
                        printk (KERN_ALERT
-                               "RAID5: Disk failure on %s, disabling device."
-                               "Operation continuing on %d devices\n",
-                               kdevname (dev), raid_conf->working_disks);
+                               "raid5: Disk failure on %s, disabling device."
+                               " Operation continuing on %d devices\n",
+                               partition_name (dev), conf->working_disks);
+                       return -EIO;
                }
+       }
+       /*
+        * handle errors in spares (during reconstruction)
+        */
+       if (conf->spare) {
+               disk = conf->spare;
+               if (disk->dev == dev) {
+                       printk (KERN_ALERT
+                               "raid5: Disk failure on spare %s\n",
+                               partition_name (dev));
+                       if (!conf->spare->operational) {
+                               MD_BUG();
+                               return -EIO;
+                       }
+                       disk->operational = 0;
+                       disk->write_only = 0;
+                       conf->spare = NULL;
+                       mark_disk_faulty(sb->disks+disk->number);
+                       mark_disk_nonsync(sb->disks+disk->number);
+                       mark_disk_inactive(sb->disks+disk->number);
+                       sb->spare_disks--;
+                       sb->working_disks--;
+                       sb->failed_disks++;
+
+                       return -EIO;
+               }
+       }
+       MD_BUG();
        return 0;
 }      
 
@@ -634,12 +667,12 @@
 static inline unsigned long 
 raid5_compute_sector (int r_sector, unsigned int raid_disks, unsigned int data_disks,
                        unsigned int * dd_idx, unsigned int * pd_idx, 
-                       struct raid5_data *raid_conf)
+                       raid5_conf_t *conf)
 {
        unsigned int  stripe;
        int chunk_number, chunk_offset;
        unsigned long new_sector;
-       int sectors_per_chunk = raid_conf->chunk_size >> 9;
+       int sectors_per_chunk = conf->chunk_size >> 9;
 
        /* First compute the information on this sector */
 
@@ -662,9 +695,9 @@
        /*
         * Select the parity disk based on the user selected algorithm.
         */
-       if (raid_conf->level == 4)
+       if (conf->level == 4)
                *pd_idx = data_disks;
-       else switch (raid_conf->algorithm) {
+       else switch (conf->algorithm) {
                case ALGORITHM_LEFT_ASYMMETRIC:
                        *pd_idx = data_disks - stripe % raid_disks;
                        if (*dd_idx >= *pd_idx)
@@ -684,7 +717,7 @@
                        *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks;
                        break;
                default:
-                       printk ("raid5: unsupported algorithm %d\n", raid_conf->algorithm);
+                       printk ("raid5: unsupported algorithm %d\n", conf->algorithm);
        }
 
        /*
@@ -705,16 +738,16 @@
 
 static unsigned long compute_blocknr(struct stripe_head *sh, int i)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
-       int raid_disks = raid_conf->raid_disks, data_disks = raid_disks - 1;
+       raid5_conf_t *conf = sh->raid_conf;
+       int raid_disks = conf->raid_disks, data_disks = raid_disks - 1;
        unsigned long new_sector = sh->sector, check;
-       int sectors_per_chunk = raid_conf->chunk_size >> 9;
+       int sectors_per_chunk = conf->chunk_size >> 9;
        unsigned long stripe = new_sector / sectors_per_chunk;
        int chunk_offset = new_sector % sectors_per_chunk;
        int chunk_number, dummy1, dummy2, dd_idx = i;
        unsigned long r_sector, blocknr;
 
-       switch (raid_conf->algorithm) {
+       switch (conf->algorithm) {
                case ALGORITHM_LEFT_ASYMMETRIC:
                case ALGORITHM_RIGHT_ASYMMETRIC:
                        if (i > sh->pd_idx)
@@ -727,14 +760,14 @@
                        i -= (sh->pd_idx + 1);
                        break;
                default:
-                       printk ("raid5: unsupported algorithm %d\n", raid_conf->algorithm);
+                       printk ("raid5: unsupported algorithm %d\n", conf->algorithm);
        }
 
        chunk_number = stripe * data_disks + i;
        r_sector = chunk_number * sectors_per_chunk + chunk_offset;
        blocknr = r_sector / (sh->size >> 9);
 
-       check = raid5_compute_sector (r_sector, raid_disks, data_disks, &dummy1, &dummy2, raid_conf);
+       check = raid5_compute_sector (r_sector, raid_disks, data_disks, &dummy1, &dummy2, conf);
        if (check != sh->sector || dummy1 != dd_idx || dummy2 != sh->pd_idx) {
                printk("compute_blocknr: map not correct\n");
                return 0;
@@ -742,36 +775,11 @@
        return blocknr;
 }
 
-#ifdef HAVE_ARCH_XORBLOCK
-static void xor_block(struct buffer_head *dest, struct buffer_head *source)
-{
-       __xor_block((char *) dest->b_data, (char *) source->b_data, dest->b_size);
-}
-#else
-static void xor_block(struct buffer_head *dest, struct buffer_head *source)
-{
-       long lines = dest->b_size / (sizeof (long)) / 8, i;
-       long *destp = (long *) dest->b_data, *sourcep = (long *) source->b_data;
-
-       for (i = lines; i > 0; i--) {
-               *(destp + 0) ^= *(sourcep + 0);
-               *(destp + 1) ^= *(sourcep + 1);
-               *(destp + 2) ^= *(sourcep + 2);
-               *(destp + 3) ^= *(sourcep + 3);
-               *(destp + 4) ^= *(sourcep + 4);
-               *(destp + 5) ^= *(sourcep + 5);
-               *(destp + 6) ^= *(sourcep + 6);
-               *(destp + 7) ^= *(sourcep + 7);
-               destp += 8;
-               sourcep += 8;
-       }
-}
-#endif
-
 static void compute_block(struct stripe_head *sh, int dd_idx)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
-       int i, disks = raid_conf->raid_disks;
+       raid5_conf_t *conf = sh->raid_conf;
+       int i, count, disks = conf->raid_disks;
+       struct buffer_head *bh_ptr[MAX_XOR_BLOCKS];
 
        PRINTK(("compute_block, stripe %lu, idx %d\n", sh->sector, dd_idx));
 
@@ -780,69 +788,100 @@
        raid5_build_block(sh, sh->bh_old[dd_idx], dd_idx);
 
        memset(sh->bh_old[dd_idx]->b_data, 0, sh->size);
+       bh_ptr[0] = sh->bh_old[dd_idx];
+       count = 1;
        for (i = 0; i < disks; i++) {
                if (i == dd_idx)
                        continue;
                if (sh->bh_old[i]) {
-                       xor_block(sh->bh_old[dd_idx], sh->bh_old[i]);
-                       continue;
-               } else
+                       bh_ptr[count++] = sh->bh_old[i];
+               } else {
                        printk("compute_block() %d, stripe %lu, %d not present\n", dd_idx, sh->sector, i);
+               }
+               if (count == MAX_XOR_BLOCKS) {
+                       xor_block(count, &bh_ptr[0]);
+                       count = 1;
+               }
+       }
+       if(count != 1) {
+               xor_block(count, &bh_ptr[0]);
        }
        raid5_mark_buffer_uptodate(sh->bh_old[dd_idx], 1);
 }
 
 static void compute_parity(struct stripe_head *sh, int method)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
-       int i, pd_idx = sh->pd_idx, disks = raid_conf->raid_disks;
+       raid5_conf_t *conf = sh->raid_conf;
+       int i, pd_idx = sh->pd_idx, disks = conf->raid_disks, lowprio, count;
+       struct buffer_head *bh_ptr[MAX_XOR_BLOCKS];
 
        PRINTK(("compute_parity, stripe %lu, method %d\n", sh->sector, method));
+       lowprio = 1;
        for (i = 0; i < disks; i++) {
                if (i == pd_idx || !sh->bh_new[i])
                        continue;
                if (!sh->bh_copy[i])
                        sh->bh_copy[i] = raid5_kmalloc_buffer(sh, sh->size);
                raid5_build_block(sh, sh->bh_copy[i], i);
+               if (!buffer_lowprio(sh->bh_new[i]))
+                       lowprio = 0;
+               else
+                       mark_buffer_lowprio(sh->bh_copy[i]);
                mark_buffer_clean(sh->bh_new[i]);
                memcpy(sh->bh_copy[i]->b_data, sh->bh_new[i]->b_data, sh->size);
        }
        if (sh->bh_copy[pd_idx] == NULL)
                sh->bh_copy[pd_idx] = raid5_kmalloc_buffer(sh, sh->size);
        raid5_build_block(sh, sh->bh_copy[pd_idx], sh->pd_idx);
+       if (lowprio)
+               mark_buffer_lowprio(sh->bh_copy[pd_idx]);
 
        if (method == RECONSTRUCT_WRITE) {
                memset(sh->bh_copy[pd_idx]->b_data, 0, sh->size);
+               bh_ptr[0] = sh->bh_copy[pd_idx];
+               count = 1;
                for (i = 0; i < disks; i++) {
                        if (i == sh->pd_idx)
                                continue;
                        if (sh->bh_new[i]) {
-                               xor_block(sh->bh_copy[pd_idx], sh->bh_copy[i]);
-                               continue;
+                               bh_ptr[count++] = sh->bh_copy[i];
+                       } else if (sh->bh_old[i]) {
+                               bh_ptr[count++] = sh->bh_old[i];
                        }
-                       if (sh->bh_old[i]) {
-                               xor_block(sh->bh_copy[pd_idx], sh->bh_old[i]);
-                               continue;
+                       if (count == MAX_XOR_BLOCKS) {
+                               xor_block(count, &bh_ptr[0]);
+                               count = 1;
                        }
                }
+               if (count != 1) {
+                       xor_block(count, &bh_ptr[0]);
+               }
        } else if (method == READ_MODIFY_WRITE) {
                memcpy(sh->bh_copy[pd_idx]->b_data, sh->bh_old[pd_idx]->b_data, sh->size);
+               bh_ptr[0] = sh->bh_copy[pd_idx];
+               count = 1;
                for (i = 0; i < disks; i++) {
                        if (i == sh->pd_idx)
                                continue;
                        if (sh->bh_new[i] && sh->bh_old[i]) {
-                               xor_block(sh->bh_copy[pd_idx], sh->bh_copy[i]);
-                               xor_block(sh->bh_copy[pd_idx], sh->bh_old[i]);
-                               continue;
+                               bh_ptr[count++] = sh->bh_copy[i];
+                               bh_ptr[count++] = sh->bh_old[i];
+                       }
+                       if (count >= (MAX_XOR_BLOCKS - 1)) {
+                               xor_block(count, &bh_ptr[0]);
+                               count = 1;
                        }
                }
+               if (count != 1) {
+                       xor_block(count, &bh_ptr[0]);
+               }
        }
        raid5_mark_buffer_uptodate(sh->bh_copy[pd_idx], 1);
 }
 
 static void add_stripe_bh (struct stripe_head *sh, struct buffer_head *bh, int dd_idx, int rw)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
+       raid5_conf_t *conf = sh->raid_conf;
        struct buffer_head *bh_req;
 
        if (sh->bh_new[dd_idx]) {
@@ -860,19 +899,22 @@
        if (sh->phase == PHASE_COMPLETE && sh->cmd == STRIPE_NONE) {
                sh->phase = PHASE_BEGIN;
                sh->cmd = (rw == READ) ? STRIPE_READ : STRIPE_WRITE;
-               raid_conf->nr_pending_stripes++;
-               atomic_inc(&raid_conf->nr_handle);
+               conf->nr_pending_stripes++;
+               atomic_inc(&conf->nr_handle);
        }
        sh->bh_new[dd_idx] = bh;
        sh->bh_req[dd_idx] = bh_req;
        sh->cmd_new[dd_idx] = rw;
        sh->new[dd_idx] = 1;
+
+       if (buffer_lowprio(bh))
+               mark_buffer_lowprio(bh_req);
 }
 
 static void complete_stripe(struct stripe_head *sh)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
-       int disks = raid_conf->raid_disks;
+       raid5_conf_t *conf = sh->raid_conf;
+       int disks = conf->raid_disks;
        int i, new = 0;
        
        PRINTK(("complete_stripe %lu\n", sh->sector));
@@ -909,6 +951,22 @@
        }
 }
 
+
+static int is_stripe_lowprio(struct stripe_head *sh, int disks)
+{
+       int i, lowprio = 1;
+
+       for (i = 0; i < disks; i++) {
+               if (sh->bh_new[i])
+                       if (!buffer_lowprio(sh->bh_new[i]))
+                               lowprio = 0;
+               if (sh->bh_old[i])
+                       if (!buffer_lowprio(sh->bh_old[i]))
+                               lowprio = 0;
+       }
+       return lowprio;
+}
+
 /*
  * handle_stripe() is our main logic routine. Note that:
  *
@@ -919,28 +977,27 @@
  * 2.  We should be careful to set sh->nr_pending whenever we sleep,
  *     to prevent re-entry of handle_stripe() for the same sh.
  *
- * 3.  raid_conf->failed_disks and disk->operational can be changed
+ * 3.  conf->failed_disks and disk->operational can be changed
  *     from an interrupt. This complicates things a bit, but it allows
  *     us to stop issuing requests for a failed drive as soon as possible.
  */
 static void handle_stripe(struct stripe_head *sh)
 {
-       struct raid5_data *raid_conf = sh->raid_conf;
-       struct md_dev *mddev = raid_conf->mddev;
-       int minor = (int) (mddev - md_dev);
+       raid5_conf_t *conf = sh->raid_conf;
+       mddev_t *mddev = conf->mddev;
        struct buffer_head *bh;
-       int disks = raid_conf->raid_disks;
-       int i, nr = 0, nr_read = 0, nr_write = 0;
+       int disks = conf->raid_disks;
+       int i, nr = 0, nr_read = 0, nr_write = 0, lowprio;
        int nr_cache = 0, nr_cache_other = 0, nr_cache_overwrite = 0, parity = 0;
        int nr_failed_other = 0, nr_failed_overwrite = 0, parity_failed = 0;
        int reading = 0, nr_writing = 0;
        int method1 = INT_MAX, method2 = INT_MAX;
        int block;
        unsigned long flags;
-       int operational[MD_SB_DISKS], failed_disks = raid_conf->failed_disks;
+       int operational[MD_SB_DISKS], failed_disks = conf->failed_disks;
 
        PRINTK(("handle_stripe(), stripe %lu\n", sh->sector));
-       if (sh->nr_pending) {
+       if (md_atomic_read(&sh->nr_pending)) {
                printk("handle_stripe(), stripe %lu, io still pending\n", sh->sector);
                return;
        }
@@ -949,9 +1006,9 @@
                return;
        }
 
-       atomic_dec(&raid_conf->nr_handle);
+       atomic_dec(&conf->nr_handle);
 
-       if (test_and_clear_bit(STRIPE_ERROR, &sh->state)) {
+       if (md_test_and_clear_bit(STRIPE_ERROR, &sh->state)) {
                printk("raid5: restarting stripe %lu\n", sh->sector);
                sh->phase = PHASE_BEGIN;
        }
@@ -969,11 +1026,11 @@
        save_flags(flags);
        cli();
        for (i = 0; i < disks; i++) {
-               operational[i] = raid_conf->disks[i].operational;
-               if (i == sh->pd_idx && raid_conf->resync_parity)
+               operational[i] = conf->disks[i].operational;
+               if (i == sh->pd_idx && conf->resync_parity)
                        operational[i] = 0;
        }
-       failed_disks = raid_conf->failed_disks;
+       failed_disks = conf->failed_disks;
        restore_flags(flags);
 
        if (failed_disks > 1) {
@@ -1017,7 +1074,7 @@
        }
 
        if (nr_write && nr_read)
-               printk("raid5: bug, nr_write == %d, nr_read == %d, sh->cmd == %d\n", nr_write, nr_read, sh->cmd);
+               printk("raid5: bug, nr_write ==`%d, nr_read == %d, sh->cmd == %d\n", nr_write, nr_read, sh->cmd);
 
        if (nr_write) {
                /*
@@ -1030,7 +1087,7 @@
                                if (sh->bh_new[i])
                                        continue;
                                block = (int) compute_blocknr(sh, i);
-                               bh = find_buffer(MKDEV(MD_MAJOR, minor), block, sh->size);
+                               bh = find_buffer(mddev_to_kdev(mddev), block, sh->size);
                                if (bh && bh->b_count == 0 && buffer_dirty(bh) && !buffer_locked(bh)) {
                                        PRINTK(("Whee.. sector %lu, index %d (%d) found in the buffer cache!\n", sh->sector, i, block));
                                        add_stripe_bh(sh, bh, i, WRITE);
@@ -1064,21 +1121,22 @@
 
                if (!method1 || !method2) {
                        lock_stripe(sh);
-                       sh->nr_pending++;
+                       lowprio = is_stripe_lowprio(sh, disks);
+                       atomic_inc(&sh->nr_pending);
                        sh->phase = PHASE_WRITE;
                        compute_parity(sh, method1 <= method2 ? RECONSTRUCT_WRITE : READ_MODIFY_WRITE);
                        for (i = 0; i < disks; i++) {
-                               if (!operational[i] && !raid_conf->spare && !raid_conf->resync_parity)
+                               if (!operational[i] && !conf->spare && !conf->resync_parity)
                                        continue;
                                if (i == sh->pd_idx || sh->bh_new[i])
                                        nr_writing++;
                        }
 
-                       sh->nr_pending = nr_writing;
-                       PRINTK(("handle_stripe() %lu, writing back %d\n", sh->sector, sh->nr_pending));
+                       md_atomic_set(&sh->nr_pending, nr_writing);
+                       PRINTK(("handle_stripe() %lu, writing back %d\n", sh->sector, md_atomic_read(&sh->nr_pending)));
 
                        for (i = 0; i < disks; i++) {
-                               if (!operational[i] && !raid_conf->spare && !raid_conf->resync_parity)
+                               if (!operational[i] && !conf->spare && !conf->resync_parity)
                                        continue;
                                bh = sh->bh_copy[i];
                                if (i != sh->pd_idx && ((bh == NULL) ^ (sh->bh_new[i] == NULL)))
@@ -1089,18 +1147,30 @@
                                        bh->b_state |= (1<<BH_Dirty);
                                        PRINTK(("making request for buffer %d\n", i));
                                        clear_bit(BH_Lock, &bh->b_state);
-                                       if (!operational[i] && !raid_conf->resync_parity) {
-                                               bh->b_rdev = raid_conf->spare->dev;
-                                               make_request(MAJOR(raid_conf->spare->dev), WRITE, bh);
-                                       } else
-                                               make_request(MAJOR(raid_conf->disks[i].dev), WRITE, bh);
+                                       if (!operational[i] && !conf->resync_parity) {
+                                               bh->b_rdev = conf->spare->dev;
+                                               make_request(MAJOR(conf->spare->dev), WRITE, bh);
+                                       } else {
+#if 0
+                                               make_request(MAJOR(conf->disks[i].dev), WRITE, bh);
+#else
+                                               if (!lowprio || (i==sh->pd_idx))
+                                                       make_request(MAJOR(conf->disks[i].dev), WRITE, bh);
+                                               else {
+                                                       mark_buffer_clean(bh);
+                                                       raid5_end_request(bh,1);
+                                                       sh->new[i] = 0;
+                                               }
+#endif
+                                       }
                                }
                        }
                        return;
                }
 
                lock_stripe(sh);
-               sh->nr_pending++;
+               lowprio = is_stripe_lowprio(sh, disks);
+               atomic_inc(&sh->nr_pending);
                if (method1 < method2) {
                        sh->write_method = RECONSTRUCT_WRITE;
                        for (i = 0; i < disks; i++) {
@@ -1110,6 +1180,8 @@
                                        continue;
                                sh->bh_old[i] = raid5_kmalloc_buffer(sh, sh->size);
                                raid5_build_block(sh, sh->bh_old[i], i);
+                               if (lowprio)
+                                       mark_buffer_lowprio(sh->bh_old[i]);
                                reading++;
                        }
                } else {
@@ -1121,19 +1193,21 @@
                                        continue;
                                sh->bh_old[i] = raid5_kmalloc_buffer(sh, sh->size);
                                raid5_build_block(sh, sh->bh_old[i], i);
+                               if (lowprio)
+                                       mark_buffer_lowprio(sh->bh_old[i]);
                                reading++;
                        }
                }
                sh->phase = PHASE_READ_OLD;
-               sh->nr_pending = reading;
-               PRINTK(("handle_stripe() %lu, reading %d old buffers\n", sh->sector, sh->nr_pending));
+               md_atomic_set(&sh->nr_pending, reading);
+               PRINTK(("handle_stripe() %lu, reading %d old buffers\n", sh->sector, md_atomic_read(&sh->nr_pending)));
                for (i = 0; i < disks; i++) {
                        if (!sh->bh_old[i])
                                continue;
                        if (buffer_uptodate(sh->bh_old[i]))
                                continue;
                        clear_bit(BH_Lock, &sh->bh_old[i]->b_state);
-                       make_request(MAJOR(raid_conf->disks[i].dev), READ, sh->bh_old[i]);
+                       make_request(MAJOR(conf->disks[i].dev), READ, sh->bh_old[i]);
                }
        } else {
                /*
@@ -1141,7 +1215,8 @@
                 */
                method1 = nr_read - nr_cache_overwrite;
                lock_stripe(sh);
-               sh->nr_pending++;
+               lowprio = is_stripe_lowprio(sh,disks);
+               atomic_inc(&sh->nr_pending);
 
                PRINTK(("handle_stripe(), sector %lu, nr_read %d, nr_cache %d, method1 %d\n", sh->sector, nr_read, nr_cache, method1));
                if (!method1 || (method1 == 1 && nr_cache == disks - 1)) {
@@ -1149,18 +1224,22 @@
                        for (i = 0; i < disks; i++) {
                                if (!sh->bh_new[i])
                                        continue;
-                               if (!sh->bh_old[i])
+                               if (!sh->bh_old[i]) {
                                        compute_block(sh, i);
+                                       if (lowprio)
+                                               mark_buffer_lowprio
+                                                       (sh->bh_old[i]);
+                               }
                                memcpy(sh->bh_new[i]->b_data, sh->bh_old[i]->b_data, sh->size);
                        }
-                       sh->nr_pending--;
+                       atomic_dec(&sh->nr_pending);
                        complete_stripe(sh);
                        return;
                }
                if (nr_failed_overwrite) {
                        sh->phase = PHASE_READ_OLD;
-                       sh->nr_pending = (disks - 1) - nr_cache;
-                       PRINTK(("handle_stripe() %lu, phase READ_OLD, pending %d\n", sh->sector, sh->nr_pending));
+                       md_atomic_set(&sh->nr_pending, (disks - 1) - nr_cache);
+                       PRINTK(("handle_stripe() %lu, phase READ_OLD, pending %d\n", sh->sector, md_atomic_read(&sh->nr_pending)));
                        for (i = 0; i < disks; i++) {
                                if (sh->bh_old[i])
                                        continue;
@@ -1168,13 +1247,16 @@
                                        continue;
                                sh->bh_old[i] = raid5_kmalloc_buffer(sh, sh->size);
                                raid5_build_block(sh, sh->bh_old[i], i);
+                               if (lowprio)
+                                       mark_buffer_lowprio(sh->bh_old[i]);
                                clear_bit(BH_Lock, &sh->bh_old[i]->b_state);
-                               make_request(MAJOR(raid_conf->disks[i].dev), READ, sh->bh_old[i]);
+                               make_request(MAJOR(conf->disks[i].dev), READ, sh->bh_old[i]);
                        }
                } else {
                        sh->phase = PHASE_READ;
-                       sh->nr_pending = nr_read - nr_cache_overwrite;
-                       PRINTK(("handle_stripe() %lu, phase READ, pending %d\n", sh->sector, sh->nr_pending));
+                       md_atomic_set(&sh->nr_pending,
+                               nr_read - nr_cache_overwrite);
+                       PRINTK(("handle_stripe() %lu, phase READ, pending %d\n", sh->sector, md_atomic_read(&sh->nr_pending)));
                        for (i = 0; i < disks; i++) {
                                if (!sh->bh_new[i])
                                        continue;
@@ -1182,16 +1264,16 @@
                                        memcpy(sh->bh_new[i]->b_data, sh->bh_old[i]->b_data, sh->size);
                                        continue;
                                }
-                               make_request(MAJOR(raid_conf->disks[i].dev), READ, sh->bh_req[i]);
+                               make_request(MAJOR(conf->disks[i].dev), READ, sh->bh_req[i]);
                        }
                }
        }
 }
 
-static int raid5_make_request (struct md_dev *mddev, int rw, struct buffer_head * bh)
+static int raid5_make_request (mddev_t *mddev, int rw, struct buffer_head * bh)
 {
-       struct raid5_data *raid_conf = (struct raid5_data *) mddev->private;
-       const unsigned int raid_disks = raid_conf->raid_disks;
+       raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
+       const unsigned int raid_disks = conf->raid_disks;
        const unsigned int data_disks = raid_disks - 1;
        unsigned int  dd_idx, pd_idx;
        unsigned long new_sector;
@@ -1202,15 +1284,15 @@
        if (rw == WRITEA) rw = WRITE;
 
        new_sector = raid5_compute_sector(bh->b_rsector, raid_disks, data_disks,
-                                               &dd_idx, &pd_idx, raid_conf);
+                                               &dd_idx, &pd_idx, conf);
 
        PRINTK(("raid5_make_request, sector %lu\n", new_sector));
 repeat:
-       sh = get_stripe(raid_conf, new_sector, bh->b_size);
+       sh = get_stripe(conf, new_sector, bh->b_size);
        if ((rw == READ && sh->cmd == STRIPE_WRITE) || (rw == WRITE && sh->cmd == STRIPE_READ)) {
                PRINTK(("raid5: lock contention, rw == %d, sh->cmd == %d\n", rw, sh->cmd));
                lock_stripe(sh);
-               if (!sh->nr_pending)
+               if (!md_atomic_read(&sh->nr_pending))
                        handle_stripe(sh);
                goto repeat;
        }
@@ -1221,24 +1303,24 @@
                printk("raid5: bug: stripe->bh_new[%d], sector %lu exists\n", dd_idx, sh->sector);
                printk("raid5: bh %p, bh_new %p\n", bh, sh->bh_new[dd_idx]);
                lock_stripe(sh);
-               md_wakeup_thread(raid_conf->thread);
+               md_wakeup_thread(conf->thread);
                wait_on_stripe(sh);
                goto repeat;
        }
        add_stripe_bh(sh, bh, dd_idx, rw);
 
-       md_wakeup_thread(raid_conf->thread);
+       md_wakeup_thread(conf->thread);
        return 0;
 }
 
 static void unplug_devices(struct stripe_head *sh)
 {
 #if 0
-       struct raid5_data *raid_conf = sh->raid_conf;
+       raid5_conf_t *conf = sh->raid_conf;
        int i;
 
-       for (i = 0; i < raid_conf->raid_disks; i++)
-               unplug_device(blk_dev + MAJOR(raid_conf->disks[i].dev));
+       for (i = 0; i < conf->raid_disks; i++)
+               unplug_device(blk_dev + MAJOR(conf->disks[i].dev));
 #endif
 }
 
@@ -1252,8 +1334,8 @@
 static void raid5d (void *data)
 {
        struct stripe_head *sh;
-       struct raid5_data *raid_conf = data;
-       struct md_dev *mddev = raid_conf->mddev;
+       raid5_conf_t *conf = data;
+       mddev_t *mddev = conf->mddev;
        int i, handled = 0, unplug = 0;
        unsigned long flags;
 
@@ -1261,47 +1343,47 @@
 
        if (mddev->sb_dirty) {
                mddev->sb_dirty = 0;
-               md_update_sb((int) (mddev - md_dev));
+               md_update_sb(mddev);
        }
        for (i = 0; i < NR_HASH; i++) {
 repeat:
-               sh = raid_conf->stripe_hashtbl[i];
+               sh = conf->stripe_hashtbl[i];
                for (; sh; sh = sh->hash_next) {
-                       if (sh->raid_conf != raid_conf)
+                       if (sh->raid_conf != conf)
                                continue;
                        if (sh->phase == PHASE_COMPLETE)
                                continue;
-                       if (sh->nr_pending)
+                       if (md_atomic_read(&sh->nr_pending))
                                continue;
-                       if (sh->sector == raid_conf->next_sector) {
-                               raid_conf->sector_count += (sh->size >> 9);
-                               if (raid_conf->sector_count >= 128)
+                       if (sh->sector == conf->next_sector) {
+                               conf->sector_count += (sh->size >> 9);
+                               if (conf->sector_count >= 128)
                                        unplug = 1;
                        } else
                                unplug = 1;
                        if (unplug) {
-                               PRINTK(("unplugging devices, sector == %lu, count == %d\n", sh->sector, raid_conf->sector_count));
+                               PRINTK(("unplugging devices, sector == %lu, count == %d\n", sh->sector, conf->sector_count));
                                unplug_devices(sh);
                                unplug = 0;
-                               raid_conf->sector_count = 0;
+                               conf->sector_count = 0;
                        }
-                       raid_conf->next_sector = sh->sector + (sh->size >> 9);
+                       conf->next_sector = sh->sector + (sh->size >> 9);
                        handled++;
                        handle_stripe(sh);
                        goto repeat;
                }
        }
-       if (raid_conf) {
-               PRINTK(("%d stripes handled, nr_handle %d\n", handled, atomic_read(&raid_conf->nr_handle)));
+       if (conf) {
+               PRINTK(("%d stripes handled, nr_handle %d\n", handled, md_atomic_read(&conf->nr_handle)));
                save_flags(flags);
                cli();
-               if (!atomic_read(&raid_conf->nr_handle))
-                       clear_bit(THREAD_WAKEUP, &raid_conf->thread->flags);
+               if (!md_atomic_read(&conf->nr_handle))
+                       clear_bit(THREAD_WAKEUP, &conf->thread->flags);
+               restore_flags(flags);
        }
        PRINTK(("--- raid5d inactive\n"));
 }
 
-#if SUPPORT_RECONSTRUCTION
 /*
  * Private kernel thread for parity reconstruction after an unclean
  * shutdown. Reconstruction on spare drives in case of a failed drive
@@ -1309,44 +1391,64 @@
  */
 static void raid5syncd (void *data)
 {
-       struct raid5_data *raid_conf = data;
-       struct md_dev *mddev = raid_conf->mddev;
+       raid5_conf_t *conf = data;
+       mddev_t *mddev = conf->mddev;
 
-       if (!raid_conf->resync_parity)
+       if (!conf->resync_parity)
+               return;
+       if (conf->resync_parity == 2)
+               return;
+       down(&mddev->recovery_sem);
+       if (md_do_sync(mddev,NULL)) {
+               up(&mddev->recovery_sem);
+               printk("raid5: resync aborted!\n");
                return;
-       md_do_sync(mddev);
-       raid_conf->resync_parity = 0;
+       }
+       conf->resync_parity = 0;
+       up(&mddev->recovery_sem);
+       printk("raid5: resync finished.\n");
 }
-#endif /* SUPPORT_RECONSTRUCTION */
 
-static int __check_consistency (struct md_dev *mddev, int row)
+static int __check_consistency (mddev_t *mddev, int row)
 {
-       struct raid5_data *raid_conf = mddev->private;
+       raid5_conf_t *conf = mddev->private;
        kdev_t dev;
        struct buffer_head *bh[MD_SB_DISKS], tmp;
-       int i, rc = 0, nr = 0;
+       int i, rc = 0, nr = 0, count;
+       struct buffer_head *bh_ptr[MAX_XOR_BLOCKS];
 
-       if (raid_conf->working_disks != raid_conf->raid_disks)
+       if (conf->working_disks != conf->raid_disks)
                return 0;
        tmp.b_size = 4096;
        if ((tmp.b_data = (char *) get_free_page(GFP_KERNEL)) == NULL)
                return 0;
+       md_clear_page((unsigned long)tmp.b_data);
        memset(bh, 0, MD_SB_DISKS * sizeof(struct buffer_head *));
-       for (i = 0; i < raid_conf->raid_disks; i++) {
-               dev = raid_conf->disks[i].dev;
+       for (i = 0; i < conf->raid_disks; i++) {
+               dev = conf->disks[i].dev;
                set_blocksize(dev, 4096);
                if ((bh[i] = bread(dev, row / 4, 4096)) == NULL)
                        break;
                nr++;
        }
-       if (nr == raid_conf->raid_disks) {
-               for (i = 1; i < nr; i++)
-                       xor_block(&tmp, bh[i]);
+       if (nr == conf->raid_disks) {
+               bh_ptr[0] = &tmp;
+               count = 1;
+               for (i = 1; i < nr; i++) {
+                       bh_ptr[count++] = bh[i];
+                       if (count == MAX_XOR_BLOCKS) {
+                               xor_block(count, &bh_ptr[0]);
+                               count = 1;
+                       }
+               }
+               if (count != 1) {
+                       xor_block(count, &bh_ptr[0]);
+               }
                if (memcmp(tmp.b_data, bh[0]->b_data, 4096))
                        rc = 1;
        }
-       for (i = 0; i < raid_conf->raid_disks; i++) {
-               dev = raid_conf->disks[i].dev;
+       for (i = 0; i < conf->raid_disks; i++) {
+               dev = conf->disks[i].dev;
                if (bh[i]) {
                        bforget(bh[i]);
                        bh[i] = NULL;
@@ -1358,285 +1460,607 @@
        return rc;
 }
 
-static int check_consistency (struct md_dev *mddev)
+static int check_consistency (mddev_t *mddev)
 {
-       int size = mddev->sb->size;
-       int row;
+       if (__check_consistency(mddev, 0))
+/*
+ * We are not checking this currently, as it's legitimate to have
+ * an inconsistent array, at creation time.
+ */
+               return 0;
 
-       for (row = 0; row < size; row += size / 8)
-               if (__check_consistency(mddev, row))
-                       return 1;
        return 0;
 }
 
-static int raid5_run (int minor, struct md_dev *mddev)
+static int raid5_run (mddev_t *mddev)
 {
-       struct raid5_data *raid_conf;
+       raid5_conf_t *conf;
        int i, j, raid_disk, memory;
-       md_superblock_t *sb = mddev->sb;
-       md_descriptor_t *descriptor;
-       struct real_dev *realdev;
+       mdp_super_t *sb = mddev->sb;
+       mdp_disk_t *desc;
+       mdk_rdev_t *rdev;
+       struct disk_info *disk;
+       struct md_list_head *tmp;
+       int start_recovery = 0;
 
        MOD_INC_USE_COUNT;
 
        if (sb->level != 5 && sb->level != 4) {
-               printk("raid5: %s: raid level not set to 4/5 (%d)\n", kdevname(MKDEV(MD_MAJOR, minor)), sb->level);
+               printk("raid5: md%d: raid level not set to 4/5 (%d)\n", mdidx(mddev), sb->level);
                MOD_DEC_USE_COUNT;
                return -EIO;
        }
 
-       mddev->private = kmalloc (sizeof (struct raid5_data), GFP_KERNEL);
-       if ((raid_conf = mddev->private) == NULL)
+       mddev->private = kmalloc (sizeof (raid5_conf_t), GFP_KERNEL);
+       if ((conf = mddev->private) == NULL)
                goto abort;
-       memset (raid_conf, 0, sizeof (*raid_conf));
-       raid_conf->mddev = mddev;
+       memset (conf, 0, sizeof (*conf));
+       conf->mddev = mddev;
 
-       if ((raid_conf->stripe_hashtbl = (struct stripe_head **) __get_free_pages(GFP_ATOMIC, HASH_PAGES_ORDER)) == NULL)
+       if ((conf->stripe_hashtbl = (struct stripe_head **) md__get_free_pages(GFP_ATOMIC, HASH_PAGES_ORDER)) == NULL)
                goto abort;
-       memset(raid_conf->stripe_hashtbl, 0, HASH_PAGES * PAGE_SIZE);
+       memset(conf->stripe_hashtbl, 0, HASH_PAGES * PAGE_SIZE);
 
-       init_waitqueue(&raid_conf->wait_for_stripe);
-       PRINTK(("raid5_run(%d) called.\n", minor));
-
-       for (i = 0; i < mddev->nb_dev; i++) {
-               realdev = &mddev->devices[i];
-               if (!realdev->sb) {
-                       printk(KERN_ERR "raid5: disabled device %s (couldn't access raid superblock)\n", kdevname(realdev->dev));
-                       continue;
-               }
+       init_waitqueue(&conf->wait_for_stripe);
+       PRINTK(("raid5_run(md%d) called.\n", mdidx(mddev)));
 
+       ITERATE_RDEV(mddev,rdev,tmp) {
                /*
                 * This is important -- we are using the descriptor on
                 * the disk only to get a pointer to the descriptor on
                 * the main superblock, which might be more recent.
                 */
-               descriptor = &sb->disks[realdev->sb->descriptor.number];
-               if (descriptor->state & (1 << MD_FAULTY_DEVICE)) {
-                       printk(KERN_ERR "raid5: disabled device %s (errors detected)\n", kdevname(realdev->dev));
+               desc = sb->disks + rdev->desc_nr;
+               raid_disk = desc->raid_disk;
+               disk = conf->disks + raid_disk;
+
+               if (disk_faulty(desc)) {
+                       printk(KERN_ERR "raid5: disabled device %s (errors detected)\n", partition_name(rdev->dev));
+                       if (!rdev->faulty) {
+                               MD_BUG();
+                               goto abort;
+                       }
+                       disk->number = desc->number;
+                       disk->raid_disk = raid_disk;
+                       disk->dev = rdev->dev;
+
+                       disk->operational = 0;
+                       disk->write_only = 0;
+                       disk->spare = 0;
+                       disk->used_slot = 1;
                        continue;
                }
-               if (descriptor->state & (1 << MD_ACTIVE_DEVICE)) {
-                       if (!(descriptor->state & (1 << MD_SYNC_DEVICE))) {
-                               printk(KERN_ERR "raid5: disabled device %s (not in sync)\n", kdevname(realdev->dev));
-                               continue;
+               if (disk_active(desc)) {
+                       if (!disk_sync(desc)) {
+                               printk(KERN_ERR "raid5: disabled device %s (not in sync)\n", partition_name(rdev->dev));
+                               MD_BUG();
+                               goto abort;
                        }
-                       raid_disk = descriptor->raid_disk;
-                       if (descriptor->number > sb->nr_disks || raid_disk > sb->raid_disks) {
-                               printk(KERN_ERR "raid5: disabled device %s (inconsistent descriptor)\n", kdevname(realdev->dev));
+                       if (raid_disk > sb->raid_disks) {
+                               printk(KERN_ERR "raid5: disabled device %s (inconsistent descriptor)\n", partition_name(rdev->dev));
                                continue;
                        }
-                       if (raid_conf->disks[raid_disk].operational) {
-                               printk(KERN_ERR "raid5: disabled device %s (device %d already operational)\n", kdevname(realdev->dev), raid_disk);
+                       if (disk->operational) {
+                               printk(KERN_ERR "raid5: disabled device %s (device %d already operational)\n", partition_name(rdev->dev), raid_disk);
                                continue;
                        }
-                       printk(KERN_INFO "raid5: device %s operational as raid disk %d\n", kdevname(realdev->dev), raid_disk);
+                       printk(KERN_INFO "raid5: device %s operational as raid disk %d\n", partition_name(rdev->dev), raid_disk);
        
-                       raid_conf->disks[raid_disk].number = descriptor->number;
-                       raid_conf->disks[raid_disk].raid_disk = raid_disk;
-                       raid_conf->disks[raid_disk].dev = mddev->devices[i].dev;
-                       raid_conf->disks[raid_disk].operational = 1;
+                       disk->number = desc->number;
+                       disk->raid_disk = raid_disk;
+                       disk->dev = rdev->dev;
+                       disk->operational = 1;
+                       disk->used_slot = 1;
 
-                       raid_conf->working_disks++;
+                       conf->working_disks++;
                } else {
                        /*
                         * Must be a spare disk ..
                         */
-                       printk(KERN_INFO "raid5: spare disk %s\n", kdevname(realdev->dev));
-                       raid_disk = descriptor->raid_disk;
-                       raid_conf->disks[raid_disk].number = descriptor->number;
-                       raid_conf->disks[raid_disk].raid_disk = raid_disk;
-                       raid_conf->disks[raid_disk].dev = mddev->devices [i].dev;
-
-                       raid_conf->disks[raid_disk].operational = 0;
-                       raid_conf->disks[raid_disk].write_only = 0;
-                       raid_conf->disks[raid_disk].spare = 1;
-               }
-       }
-       raid_conf->raid_disks = sb->raid_disks;
-       raid_conf->failed_disks = raid_conf->raid_disks - raid_conf->working_disks;
-       raid_conf->mddev = mddev;
-       raid_conf->chunk_size = sb->chunk_size;
-       raid_conf->level = sb->level;
-       raid_conf->algorithm = sb->parity_algorithm;
-       raid_conf->max_nr_stripes = NR_STRIPES;
+                       printk(KERN_INFO "raid5: spare disk %s\n", partition_name(rdev->dev));
+                       disk->number = desc->number;
+                       disk->raid_disk = raid_disk;
+                       disk->dev = rdev->dev;
 
-       if (raid_conf->working_disks != sb->raid_disks && sb->state != (1 << MD_SB_CLEAN)) {
-               printk(KERN_ALERT "raid5: raid set %s not clean and not all disks are operational -- run ckraid\n", kdevname(MKDEV(MD_MAJOR, minor)));
-               goto abort;
+                       disk->operational = 0;
+                       disk->write_only = 0;
+                       disk->spare = 1;
+                       disk->used_slot = 1;
+               }
        }
-       if (!raid_conf->chunk_size || raid_conf->chunk_size % 4) {
-               printk(KERN_ERR "raid5: invalid chunk size %d for %s\n", raid_conf->chunk_size, kdevname(MKDEV(MD_MAJOR, minor)));
+
+       for (i = 0; i < MD_SB_DISKS; i++) {
+               desc = sb->disks + i;
+               raid_disk = desc->raid_disk;
+               disk = conf->disks + raid_disk;
+
+               if (disk_faulty(desc) && (raid_disk < sb->raid_disks) &&
+                       !conf->disks[raid_disk].used_slot) {
+
+                       disk->number = desc->number;
+                       disk->raid_disk = raid_disk;
+                       disk->dev = MKDEV(0,0);
+
+                       disk->operational = 0;
+                       disk->write_only = 0;
+                       disk->spare = 0;
+                       disk->used_slot = 1;
+               }
+       }
+
+       conf->raid_disks = sb->raid_disks;
+       /*
+        * 0 for a fully functional array, 1 for a degraded array.
+        */
+       conf->failed_disks = conf->raid_disks - conf->working_disks;
+       conf->mddev = mddev;
+       conf->chunk_size = sb->chunk_size;
+       conf->level = sb->level;
+       conf->algorithm = sb->layout;
+       conf->max_nr_stripes = NR_STRIPES;
+
+#if 0
+       for (i = 0; i < conf->raid_disks; i++) {
+               if (!conf->disks[i].used_slot) {
+                       MD_BUG();
+                       goto abort;
+               }
+       }
+#endif
+       if (!conf->chunk_size || conf->chunk_size % 4) {
+               printk(KERN_ERR "raid5: invalid chunk size %d for md%d\n", conf->chunk_size, mdidx(mddev));
                goto abort;
        }
-       if (raid_conf->algorithm > ALGORITHM_RIGHT_SYMMETRIC) {
-               printk(KERN_ERR "raid5: unsupported parity algorithm %d for %s\n", raid_conf->algorithm, kdevname(MKDEV(MD_MAJOR, minor)));
+       if (conf->algorithm > ALGORITHM_RIGHT_SYMMETRIC) {
+               printk(KERN_ERR "raid5: unsupported parity algorithm %d for md%d\n", conf->algorithm, mdidx(mddev));
                goto abort;
        }
-       if (raid_conf->failed_disks > 1) {
-               printk(KERN_ERR "raid5: not enough operational devices for %s (%d/%d failed)\n", kdevname(MKDEV(MD_MAJOR, minor)), raid_conf->failed_disks, raid_conf->raid_disks);
+       if (conf->failed_disks > 1) {
+               printk(KERN_ERR "raid5: not enough operational devices for md%d (%d/%d failed)\n", mdidx(mddev), conf->failed_disks, conf->raid_disks);
                goto abort;
        }
 
-       if ((sb->state & (1 << MD_SB_CLEAN)) && check_consistency(mddev)) {
-               printk(KERN_ERR "raid5: detected raid-5 xor inconsistenty -- run ckraid\n");
-               sb->state |= 1 << MD_SB_ERRORS;
-               goto abort;
+       if (conf->working_disks != sb->raid_disks) {
+               printk(KERN_ALERT "raid5: md%d, not all disks are operational -- trying to recover array\n", mdidx(mddev));
+               start_recovery = 1;
        }
 
-       if ((raid_conf->thread = md_register_thread(raid5d, raid_conf)) == NULL) {
-               printk(KERN_ERR "raid5: couldn't allocate thread for %s\n", kdevname(MKDEV(MD_MAJOR, minor)));
-               goto abort;
+       if (!start_recovery && (sb->state & (1 << MD_SB_CLEAN)) &&
+                       check_consistency(mddev)) {
+               printk(KERN_ERR "raid5: detected raid-5 superblock xor inconsistency -- running resync\n");
+               sb->state &= ~(1 << MD_SB_CLEAN);
        }
 
-#if SUPPORT_RECONSTRUCTION
-       if ((raid_conf->resync_thread = md_register_thread(raid5syncd, raid_conf)) == NULL) {
-               printk(KERN_ERR "raid5: couldn't allocate thread for %s\n", kdevname(MKDEV(MD_MAJOR, minor)));
-               goto abort;
+       {
+               const char * name = "raid5d";
+
+               conf->thread = md_register_thread(raid5d, conf, name);
+               if (!conf->thread) {
+                       printk(KERN_ERR "raid5: couldn't allocate thread for md%d\n", mdidx(mddev));
+                       goto abort;
+               }
        }
-#endif /* SUPPORT_RECONSTRUCTION */
 
-       memory = raid_conf->max_nr_stripes * (sizeof(struct stripe_head) +
-                raid_conf->raid_disks * (sizeof(struct buffer_head) +
+       memory = conf->max_nr_stripes * (sizeof(struct stripe_head) +
+                conf->raid_disks * (sizeof(struct buffer_head) +
                 2 * (sizeof(struct buffer_head) + PAGE_SIZE))) / 1024;
-       if (grow_stripes(raid_conf, raid_conf->max_nr_stripes, GFP_KERNEL)) {
+       if (grow_stripes(conf, conf->max_nr_stripes, GFP_KERNEL)) {
                printk(KERN_ERR "raid5: couldn't allocate %dkB for buffers\n", memory);
-               shrink_stripes(raid_conf, raid_conf->max_nr_stripes);
+               shrink_stripes(conf, conf->max_nr_stripes);
                goto abort;
        } else
-               printk(KERN_INFO "raid5: allocated %dkB for %s\n", memory, kdevname(MKDEV(MD_MAJOR, minor)));
+               printk(KERN_INFO "raid5: allocated %dkB for md%d\n", memory, mdidx(mddev));
 
        /*
         * Regenerate the "device is in sync with the raid set" bit for
         * each device.
         */
-       for (i = 0; i < sb->nr_disks ; i++) {
-               sb->disks[i].state &= ~(1 << MD_SYNC_DEVICE);
+       for (i = 0; i < MD_SB_DISKS ; i++) {
+               mark_disk_nonsync(sb->disks + i);
                for (j = 0; j < sb->raid_disks; j++) {
-                       if (!raid_conf->disks[j].operational)
+                       if (!conf->disks[j].operational)
                                continue;
-                       if (sb->disks[i].number == raid_conf->disks[j].number)
-                               sb->disks[i].state |= 1 << MD_SYNC_DEVICE;
+                       if (sb->disks[i].number == conf->disks[j].number)
+                               mark_disk_sync(sb->disks + i);
                }
        }
-       sb->active_disks = raid_conf->working_disks;
+       sb->active_disks = conf->working_disks;
 
        if (sb->active_disks == sb->raid_disks)
-               printk("raid5: raid level %d set %s active with %d out of %d devices, algorithm %d\n", raid_conf->level, kdevname(MKDEV(MD_MAJOR, minor)), sb->active_disks, sb->raid_disks, raid_conf->algorithm);
+               printk("raid5: raid level %d set md%d active with %d out of %d devices, algorithm %d\n", conf->level, mdidx(mddev), sb->active_disks, sb->raid_disks, conf->algorithm);
        else
-               printk(KERN_ALERT "raid5: raid level %d set %s active with %d out of %d devices, algorithm %d\n", raid_conf->level, kdevname(MKDEV(MD_MAJOR, minor)), sb->active_disks, sb->raid_disks, raid_conf->algorithm);
+               printk(KERN_ALERT "raid5: raid level %d set md%d active with %d out of %d devices, algorithm %d\n", conf->level, mdidx(mddev), sb->active_disks, sb->raid_disks, conf->algorithm);
+
+       if (!start_recovery && ((sb->state & (1 << MD_SB_CLEAN))==0)) {
+               const char * name = "raid5syncd";
+
+               conf->resync_thread = md_register_thread(raid5syncd, conf,name);
+               if (!conf->resync_thread) {
+                       printk(KERN_ERR "raid5: couldn't allocate thread for md%d\n", mdidx(mddev));
+                       goto abort;
+               }
 
-       if ((sb->state & (1 << MD_SB_CLEAN)) == 0) {
-               printk("raid5: raid set %s not clean; re-constructing parity\n", kdevname(MKDEV(MD_MAJOR, minor)));
-               raid_conf->resync_parity = 1;
-#if SUPPORT_RECONSTRUCTION
-               md_wakeup_thread(raid_conf->resync_thread);
-#endif /* SUPPORT_RECONSTRUCTION */
+               printk("raid5: raid set md%d not clean; reconstructing parity\n", mdidx(mddev));
+               conf->resync_parity = 1;
+               md_wakeup_thread(conf->resync_thread);
        }
 
+       print_raid5_conf(conf);
+       if (start_recovery)
+               md_recover_arrays();
+       print_raid5_conf(conf);
+
        /* Ok, everything is just fine now */
        return (0);
 abort:
-       if (raid_conf) {
-               if (raid_conf->stripe_hashtbl)
-                       free_pages((unsigned long) raid_conf->stripe_hashtbl, HASH_PAGES_ORDER);
-               kfree(raid_conf);
+       if (conf) {
+               print_raid5_conf(conf);
+               if (conf->stripe_hashtbl)
+                       free_pages((unsigned long) conf->stripe_hashtbl,
+                                                       HASH_PAGES_ORDER);
+               kfree(conf);
        }
        mddev->private = NULL;
-       printk(KERN_ALERT "raid5: failed to run raid set %s\n", kdevname(MKDEV(MD_MAJOR, minor)));
+       printk(KERN_ALERT "raid5: failed to run raid set md%d\n", mdidx(mddev));
        MOD_DEC_USE_COUNT;
        return -EIO;
 }
 
-static int raid5_stop (int minor, struct md_dev *mddev)
+static int raid5_stop_resync (mddev_t *mddev)
+{
+       raid5_conf_t *conf = mddev_to_conf(mddev);
+       mdk_thread_t *thread = conf->resync_thread;
+
+       if (thread) {
+               if (conf->resync_parity) {
+                       conf->resync_parity = 2;
+                       md_interrupt_thread(thread);
+                       printk(KERN_INFO "raid5: parity resync was not fully finished, restarting next time.\n");
+                       return 1;
+               }
+               return 0;
+       }
+       return 0;
+}
+
+static int raid5_restart_resync (mddev_t *mddev)
 {
-       struct raid5_data *raid_conf = (struct raid5_data *) mddev->private;
+       raid5_conf_t *conf = mddev_to_conf(mddev);
 
-       shrink_stripe_cache(raid_conf, raid_conf->max_nr_stripes);
-       shrink_stripes(raid_conf, raid_conf->max_nr_stripes);
-       md_unregister_thread(raid_conf->thread);
-#if SUPPORT_RECONSTRUCTION
-       md_unregister_thread(raid_conf->resync_thread);
-#endif /* SUPPORT_RECONSTRUCTION */
-       free_pages((unsigned long) raid_conf->stripe_hashtbl, HASH_PAGES_ORDER);
-       kfree(raid_conf);
+       if (conf->resync_parity) {
+               if (!conf->resync_thread) {
+                       MD_BUG();
+                       return 0;
+               }
+               printk("raid5: waking up raid5resync.\n");
+               conf->resync_parity = 1;
+               md_wakeup_thread(conf->resync_thread);
+               return 1;
+       } else
+               printk("raid5: no restart-resync needed.\n");
+       return 0;
+}
+
+
+static int raid5_stop (mddev_t *mddev)
+{
+       raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
+
+       shrink_stripe_cache(conf, conf->max_nr_stripes);
+       shrink_stripes(conf, conf->max_nr_stripes);
+       md_unregister_thread(conf->thread);
+       if (conf->resync_thread)
+               md_unregister_thread(conf->resync_thread);
+       free_pages((unsigned long) conf->stripe_hashtbl, HASH_PAGES_ORDER);
+       kfree(conf);
        mddev->private = NULL;
        MOD_DEC_USE_COUNT;
        return 0;
 }
 
-static int raid5_status (char *page, int minor, struct md_dev *mddev)
+static int raid5_status (char *page, mddev_t *mddev)
 {
-       struct raid5_data *raid_conf = (struct raid5_data *) mddev->private;
-       md_superblock_t *sb = mddev->sb;
+       raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
+       mdp_super_t *sb = mddev->sb;
        int sz = 0, i;
 
-       sz += sprintf (page+sz, " level %d, %dk chunk, algorithm %d", sb->level, sb->chunk_size >> 10, sb->parity_algorithm);
-       sz += sprintf (page+sz, " [%d/%d] [", raid_conf->raid_disks, raid_conf->working_disks);
-       for (i = 0; i < raid_conf->raid_disks; i++)
-               sz += sprintf (page+sz, "%s", raid_conf->disks[i].operational ? "U" : "_");
+       sz += sprintf (page+sz, " level %d, %dk chunk, algorithm %d", sb->level, sb->chunk_size >> 10, sb->layout);
+       sz += sprintf (page+sz, " [%d/%d] [", conf->raid_disks, conf->working_disks);
+       for (i = 0; i < conf->raid_disks; i++)
+               sz += sprintf (page+sz, "%s", conf->disks[i].operational ? "U" : "_");
        sz += sprintf (page+sz, "]");
        return sz;
 }
 
-static int raid5_mark_spare(struct md_dev *mddev, md_descriptor_t *spare, int state)
+static void print_raid5_conf (raid5_conf_t *conf)
+{
+       int i;
+       struct disk_info *tmp;
+
+       printk("RAID5 conf printout:\n");
+       if (!conf) {
+               printk("(conf==NULL)\n");
+               return;
+       }
+       printk(" --- rd:%d wd:%d fd:%d\n", conf->raid_disks,
+                conf->working_disks, conf->failed_disks);
+
+       for (i = 0; i < MD_SB_DISKS; i++) {
+               tmp = conf->disks + i;
+               printk(" disk %d, s:%d, o:%d, n:%d rd:%d us:%d dev:%s\n",
+                       i, tmp->spare,tmp->operational,
+                       tmp->number,tmp->raid_disk,tmp->used_slot,
+                       partition_name(tmp->dev));
+       }
+}
+
+static int raid5_diskop(mddev_t *mddev, mdp_disk_t **d, int state)
 {
-       int i = 0, failed_disk = -1;
-       struct raid5_data *raid_conf = mddev->private;
-       struct disk_info *disk = raid_conf->disks;
+       int err = 0;
+       int i, failed_disk=-1, spare_disk=-1, removed_disk=-1, added_disk=-1;
+       raid5_conf_t *conf = mddev->private;
+       struct disk_info *tmp, *sdisk, *fdisk, *rdisk, *adisk;
        unsigned long flags;
-       md_superblock_t *sb = mddev->sb;
-       md_descriptor_t *descriptor;
+       mdp_super_t *sb = mddev->sb;
+       mdp_disk_t *failed_desc, *spare_desc, *added_desc;
 
-       for (i = 0; i < MD_SB_DISKS; i++, disk++) {
-               if (disk->spare && disk->number == spare->number)
-                       goto found;
-       }
-       return 1;
-found:
-       for (i = 0, disk = raid_conf->disks; i < raid_conf->raid_disks; i++, disk++)
-               if (!disk->operational)
-                       failed_disk = i;
-       if (failed_disk == -1)
-               return 1;
        save_flags(flags);
        cli();
+
+       print_raid5_conf(conf);
+       /*
+        * find the disk ...
+        */
        switch (state) {
-               case SPARE_WRITE:
-                       disk->operational = 1;
-                       disk->write_only = 1;
-                       raid_conf->spare = disk;
-                       break;
-               case SPARE_INACTIVE:
-                       disk->operational = 0;
-                       disk->write_only = 0;
-                       raid_conf->spare = NULL;
-                       break;
-               case SPARE_ACTIVE:
-                       disk->spare = 0;
-                       disk->write_only = 0;
 
-                       descriptor = &sb->disks[raid_conf->disks[failed_disk].number];
-                       i = spare->raid_disk;
-                       disk->raid_disk = spare->raid_disk = descriptor->raid_disk;
-                       if (disk->raid_disk != failed_disk)
-                               printk("raid5: disk->raid_disk != failed_disk");
-                       descriptor->raid_disk = i;
-
-                       raid_conf->spare = NULL;
-                       raid_conf->working_disks++;
-                       raid_conf->failed_disks--;
-                       raid_conf->disks[failed_disk] = *disk;
-                       break;
-               default:
-                       printk("raid5_mark_spare: bug: state == %d\n", state);
-                       restore_flags(flags);
-                       return 1;
+       case DISKOP_SPARE_ACTIVE:
+
+               /*
+                * Find the failed disk within the RAID5 configuration ...
+                * (this can only be in the first conf->raid_disks part)
+                */
+               for (i = 0; i < conf->raid_disks; i++) {
+                       tmp = conf->disks + i;
+                       if ((!tmp->operational && !tmp->spare) ||
+                                       !tmp->used_slot) {
+                               failed_disk = i;
+                               break;
+                       }
+               }
+               /*
+                * When we activate a spare disk we _must_ have a disk in
+                * the lower (active) part of the array to replace. 
+                */
+               if ((failed_disk == -1) || (failed_disk >= conf->raid_disks)) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+               /* fall through */
+
+       case DISKOP_SPARE_WRITE:
+       case DISKOP_SPARE_INACTIVE:
+
+               /*
+                * Find the spare disk ... (can only be in the 'high'
+                * area of the array)
+                */
+               for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+                       tmp = conf->disks + i;
+                       if (tmp->spare && tmp->number == (*d)->number) {
+                               spare_disk = i;
+                               break;
+                       }
+               }
+               if (spare_disk == -1) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+               break;
+
+       case DISKOP_HOT_REMOVE_DISK:
+
+               for (i = 0; i < MD_SB_DISKS; i++) {
+                       tmp = conf->disks + i;
+                       if (tmp->used_slot && (tmp->number == (*d)->number)) {
+                               if (tmp->operational) {
+                                       err = -EBUSY;
+                                       goto abort;
+                               }
+                               removed_disk = i;
+                               break;
+                       }
+               }
+               if (removed_disk == -1) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+               break;
+
+       case DISKOP_HOT_ADD_DISK:
+
+               for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+                       tmp = conf->disks + i;
+                       if (!tmp->used_slot) {
+                               added_disk = i;
+                               break;
+                       }
+               }
+               if (added_disk == -1) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+               break;
+       }
+
+       switch (state) {
+       /*
+        * Switch the spare disk to write-only mode:
+        */
+       case DISKOP_SPARE_WRITE:
+               if (conf->spare) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+               sdisk = conf->disks + spare_disk;
+               sdisk->operational = 1;
+               sdisk->write_only = 1;
+               conf->spare = sdisk;
+               break;
+       /*
+        * Deactivate a spare disk:
+        */
+       case DISKOP_SPARE_INACTIVE:
+               sdisk = conf->disks + spare_disk;
+               sdisk->operational = 0;
+               sdisk->write_only = 0;
+               /*
+                * Was the spare being resynced?
+                */
+               if (conf->spare == sdisk)
+                       conf->spare = NULL;
+               break;
+       /*
+        * Activate (mark read-write) the (now sync) spare disk,
+        * which means we switch it's 'raid position' (->raid_disk)
+        * with the failed disk. (only the first 'conf->raid_disks'
+        * slots are used for 'real' disks and we must preserve this
+        * property)
+        */
+       case DISKOP_SPARE_ACTIVE:
+               if (!conf->spare) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+               sdisk = conf->disks + spare_disk;
+               fdisk = conf->disks + failed_disk;
+
+               spare_desc = &sb->disks[sdisk->number];
+               failed_desc = &sb->disks[fdisk->number];
+
+               if (spare_desc != *d) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+
+               if (spare_desc->raid_disk != sdisk->raid_disk) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+                       
+               if (sdisk->raid_disk != spare_disk) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+
+               if (failed_desc->raid_disk != fdisk->raid_disk) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+
+               if (fdisk->raid_disk != failed_disk) {
+                       MD_BUG();
+                       err = 1;
+                       goto abort;
+               }
+
+               /*
+                * do the switch finally
+                */
+               xchg_values(*spare_desc, *failed_desc);
+               xchg_values(*fdisk, *sdisk);
+
+               /*
+                * (careful, 'failed' and 'spare' are switched from now on)
+                *
+                * we want to preserve linear numbering and we want to
+                * give the proper raid_disk number to the now activated
+                * disk. (this means we switch back these values)
+                */
+       
+               xchg_values(spare_desc->raid_disk, failed_desc->raid_disk);
+               xchg_values(sdisk->raid_disk, fdisk->raid_disk);
+               xchg_values(spare_desc->number, failed_desc->number);
+               xchg_values(sdisk->number, fdisk->number);
+
+               *d = failed_desc;
+
+               if (sdisk->dev == MKDEV(0,0))
+                       sdisk->used_slot = 0;
+
+               /*
+                * this really activates the spare.
+                */
+               fdisk->spare = 0;
+               fdisk->write_only = 0;
+
+               /*
+                * if we activate a spare, we definitely replace a
+                * non-operational disk slot in the 'low' area of
+                * the disk array.
+                */
+               conf->failed_disks--;
+               conf->working_disks++;
+               conf->spare = NULL;
+
+               break;
+
+       case DISKOP_HOT_REMOVE_DISK:
+               rdisk = conf->disks + removed_disk;
+
+               if (rdisk->spare && (removed_disk < conf->raid_disks)) {
+                       MD_BUG();       
+                       err = 1;
+                       goto abort;
+               }
+               rdisk->dev = MKDEV(0,0);
+               rdisk->used_slot = 0;
+
+               break;
+
+       case DISKOP_HOT_ADD_DISK:
+               adisk = conf->disks + added_disk;
+               added_desc = *d;
+
+               if (added_disk != added_desc->number) {
+                       MD_BUG();       
+                       err = 1;
+                       goto abort;
+               }
+
+               adisk->number = added_desc->number;
+               adisk->raid_disk = added_desc->raid_disk;
+               adisk->dev = MKDEV(added_desc->major,added_desc->minor);
+
+               adisk->operational = 0;
+               adisk->write_only = 0;
+               adisk->spare = 1;
+               adisk->used_slot = 1;
+
+
+               break;
+
+       default:
+               MD_BUG();       
+               err = 1;
+               goto abort;
        }
+abort:
        restore_flags(flags);
-       return 0;
+       print_raid5_conf(conf);
+       return err;
 }
 
-static struct md_personality raid5_personality=
+static mdk_personality_t raid5_personality=
 {
        "raid5",
        raid5_map,
@@ -1648,14 +2072,19 @@
        NULL,                   /* no ioctls */
        0,
        raid5_error,
-       /* raid5_hot_add_disk, */ NULL,
-       /* raid1_hot_remove_drive */ NULL,
-       raid5_mark_spare
+       raid5_diskop,
+       raid5_stop_resync,
+       raid5_restart_resync
 };
 
 int raid5_init (void)
 {
-       return register_md_personality (RAID5, &raid5_personality);
+       int err;
+
+       err = register_md_personality (RAID5, &raid5_personality);
+       if (err)
+               return err;
+       return 0;
 }
 
 #ifdef MODULE
--- linux/drivers/block/translucent.c.orig      Tue Jan 16 13:42:04 2001
+++ linux/drivers/block/translucent.c   Tue Jan 16 13:42:04 2001
@@ -0,0 +1,136 @@
+/*
+   translucent.c : Translucent RAID driver for Linux
+              Copyright (C) 1998 Ingo Molnar
+
+   Translucent mode management functions.
+
+   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, or (at your option)
+   any later version.
+   
+   You should have received a copy of the GNU General Public License
+   (for example /usr/src/linux/COPYING); if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
+*/
+
+#include <linux/module.h>
+
+#include <linux/raid/md.h>
+#include <linux/malloc.h>
+
+#include <linux/raid/translucent.h>
+
+#define MAJOR_NR MD_MAJOR
+#define MD_DRIVER
+#define MD_PERSONALITY
+
+static int translucent_run (mddev_t *mddev)
+{
+       translucent_conf_t *conf;
+       mdk_rdev_t *rdev;
+       int i;
+
+       MOD_INC_USE_COUNT;
+
+       conf = kmalloc (sizeof (*conf), GFP_KERNEL);
+       if (!conf)
+               goto out;
+       mddev->private = conf;
+
+       if (mddev->nb_dev != 2) {
+               printk("translucent: this mode needs 2 disks, aborting!\n");
+               goto out;
+       }
+
+       if (md_check_ordering(mddev)) {
+               printk("translucent: disks are not ordered, aborting!\n");
+               goto out;
+       }
+
+       ITERATE_RDEV_ORDERED(mddev,rdev,i) {
+               dev_info_t *disk = conf->disks + i;
+
+               disk->dev = rdev->dev;
+               disk->size = rdev->size;
+       }
+
+       return 0;
+
+out:
+       if (conf)
+               kfree(conf);
+
+       MOD_DEC_USE_COUNT;
+       return 1;
+}
+
+static int translucent_stop (mddev_t *mddev)
+{
+       translucent_conf_t *conf = mddev_to_conf(mddev);
+  
+       kfree(conf);
+
+       MOD_DEC_USE_COUNT;
+
+       return 0;
+}
+
+
+static int translucent_map (mddev_t *mddev, kdev_t dev, kdev_t *rdev,
+                      unsigned long *rsector, unsigned long size)
+{
+       translucent_conf_t *conf = mddev_to_conf(mddev);
+  
+       *rdev = conf->disks[0].dev;
+
+       return 0;
+}
+
+static int translucent_status (char *page, mddev_t *mddev)
+{
+       int sz = 0;
+  
+       sz += sprintf(page+sz, " %d%% full", 10);
+       return sz;
+}
+
+
+static mdk_personality_t translucent_personality=
+{
+       "translucent",
+       translucent_map,
+       NULL,
+       NULL,
+       translucent_run,
+       translucent_stop,
+       translucent_status,
+       NULL,
+       0,
+       NULL,
+       NULL,
+       NULL,
+       NULL
+};
+
+#ifndef MODULE
+
+md__initfunc(void translucent_init (void))
+{
+       register_md_personality (TRANSLUCENT, &translucent_personality);
+}
+
+#else
+
+int init_module (void)
+{
+       return (register_md_personality (TRANSLUCENT, &translucent_personality));
+}
+
+void cleanup_module (void)
+{
+       unregister_md_personality (TRANSLUCENT);
+}
+
+#endif
+
--- linux/drivers/block/xor.c.orig      Tue Jan 16 13:42:04 2001
+++ linux/drivers/block/xor.c   Tue Jan 16 13:42:04 2001
@@ -0,0 +1,1894 @@
+/*
+ * xor.c : Multiple Devices driver for Linux
+ *
+ * Copyright (C) 1996, 1997, 1998, 1999 Ingo Molnar, Matti Aarnio, Jakub Jelinek
+ *
+ *
+ * optimized RAID-5 checksumming functions.
+ *
+ * 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, or (at your option)
+ * any later version.
+ *
+ * You should have received a copy of the GNU General Public License
+ * (for example /usr/src/linux/COPYING); if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/module.h>
+#include <linux/raid/md.h>
+#ifdef __sparc_v9__
+#include <asm/head.h>
+#include <asm/asi.h>
+#include <asm/visasm.h>
+#endif
+
+/*
+ * we use the 'XOR function template' to register multiple xor
+ * functions runtime. The kernel measures their speed upon bootup
+ * and decides which one to use. (compile-time registration is
+ * not enough as certain CPU features like MMX can only be detected
+ * runtime)
+ *
+ * this architecture makes it pretty easy to add new routines
+ * that are faster on certain CPUs, without killing other CPU's
+ * 'native' routine. Although the current routines are belived
+ * to be the physically fastest ones on all CPUs tested, but
+ * feel free to prove me wrong and add yet another routine =B-)
+ * --mingo
+ */
+
+#define MAX_XOR_BLOCKS 5
+
+#define XOR_ARGS (unsigned int count, struct buffer_head **bh_ptr)
+
+typedef void (*xor_block_t) XOR_ARGS;
+xor_block_t xor_block = NULL;
+
+#ifndef __sparc_v9__
+
+struct xor_block_template;
+
+struct xor_block_template {
+       char * name;
+       xor_block_t xor_block;
+       int speed;
+       struct xor_block_template * next;
+};
+
+struct xor_block_template * xor_functions = NULL;
+
+#define XORBLOCK_TEMPLATE(x) \
+static void xor_block_##x XOR_ARGS; \
+static struct xor_block_template t_xor_block_##x = \
+                                { #x, xor_block_##x, 0, NULL }; \
+static void xor_block_##x XOR_ARGS
+
+#ifdef __i386__
+
+#ifdef CONFIG_X86_XMM
+/*
+ * Cache avoiding checksumming functions utilizing KNI instructions
+ * Copyright (C) 1999 Zach Brown (with obvious credit due Ingo)
+ */
+
+XORBLOCK_TEMPLATE(pIII_kni)
+{
+       char xmm_save[16*4];
+       int cr0;
+        int lines = (bh_ptr[0]->b_size>>8);
+
+       __asm__ __volatile__ ( 
+               "movl %%cr0,%0          ;\n\t"
+               "clts                   ;\n\t"
+               "movups %%xmm0,(%1)     ;\n\t"
+               "movups %%xmm1,0x10(%1) ;\n\t"
+               "movups %%xmm2,0x20(%1) ;\n\t"
+               "movups %%xmm3,0x30(%1) ;\n\t"
+               : "=r" (cr0)
+               : "r" (xmm_save) 
+               : "memory" );
+
+#define OFFS(x) "8*("#x"*2)"
+#define        PF0(x) \
+       "       prefetcht0  "OFFS(x)"(%1)   ;\n"
+#define LD(x,y) \
+        "       movaps   "OFFS(x)"(%1), %%xmm"#y"   ;\n"
+#define ST(x,y) \
+        "       movaps %%xmm"#y",   "OFFS(x)"(%1)   ;\n"
+#define PF1(x) \
+       "       prefetchnta "OFFS(x)"(%2)   ;\n"
+#define PF2(x) \
+       "       prefetchnta "OFFS(x)"(%3)   ;\n"
+#define PF3(x) \
+       "       prefetchnta "OFFS(x)"(%4)   ;\n"
+#define PF4(x) \
+       "       prefetchnta "OFFS(x)"(%5)   ;\n"
+#define PF5(x) \
+       "       prefetchnta "OFFS(x)"(%6)   ;\n"
+#define XO1(x,y) \
+        "       xorps   "OFFS(x)"(%2), %%xmm"#y"   ;\n"
+#define XO2(x,y) \
+        "       xorps   "OFFS(x)"(%3), %%xmm"#y"   ;\n"
+#define XO3(x,y) \
+        "       xorps   "OFFS(x)"(%4), %%xmm"#y"   ;\n"
+#define XO4(x,y) \
+        "       xorps   "OFFS(x)"(%5), %%xmm"#y"   ;\n"
+#define XO5(x,y) \
+        "       xorps   "OFFS(x)"(%6), %%xmm"#y"   ;\n"
+
+       switch(count) {
+               case 2:
+                       __asm__ __volatile__ (
+#undef BLOCK
+#define BLOCK(i) \
+               LD(i,0)                                 \
+                       LD(i+1,1)                       \
+               PF1(i)                                  \
+                               PF1(i+2)                \
+                               LD(i+2,2)               \
+                                       LD(i+3,3)       \
+               PF0(i+4)                                \
+                               PF0(i+6)                \
+               XO1(i,0)                                \
+                       XO1(i+1,1)                      \
+                               XO1(i+2,2)              \
+                                       XO1(i+3,3)      \
+               ST(i,0)                                 \
+                       ST(i+1,1)                       \
+                               ST(i+2,2)               \
+                                       ST(i+3,3)       \
+
+
+               PF0(0)
+                               PF0(2)
+
+       " .align 32,0x90                ;\n"
+        " 1:                            ;\n"
+
+               BLOCK(0)
+               BLOCK(4)
+               BLOCK(8)
+               BLOCK(12)
+
+        "       addl $256, %1           ;\n"
+        "       addl $256, %2           ;\n"
+        "       decl %0                 ;\n"
+        "       jnz 1b                  ;\n"
+
+                       :
+                       : "r" (lines),
+                         "r" (bh_ptr[0]->b_data),
+                         "r" (bh_ptr[1]->b_data)
+                       : "memory" );
+                       break;
+               case 3:
+                       __asm__ __volatile__ (
+#undef BLOCK
+#define BLOCK(i) \
+               PF1(i)                                  \
+                               PF1(i+2)                \
+               LD(i,0)                                 \
+                       LD(i+1,1)                       \
+                               LD(i+2,2)               \
+                                       LD(i+3,3)       \
+               PF2(i)                                  \
+                               PF2(i+2)                \
+               PF0(i+4)                                \
+                               PF0(i+6)                \
+               XO1(i,0)                                \
+                       XO1(i+1,1)                      \
+                               XO1(i+2,2)              \
+                                       XO1(i+3,3)      \
+               XO2(i,0)                                \
+                       XO2(i+1,1)                      \
+                               XO2(i+2,2)              \
+                                       XO2(i+3,3)      \
+               ST(i,0)                                 \
+                       ST(i+1,1)                       \
+                               ST(i+2,2)               \
+                                       ST(i+3,3)       \
+
+
+               PF0(0)
+                               PF0(2)
+
+       " .align 32,0x90                ;\n"
+        " 1:                            ;\n"
+
+               BLOCK(0)
+               BLOCK(4)
+               BLOCK(8)
+               BLOCK(12)
+
+        "       addl $256, %1           ;\n"
+        "       addl $256, %2           ;\n"
+        "       addl $256, %3           ;\n"
+        "       decl %0                 ;\n"
+        "       jnz 1b                  ;\n"
+                       :
+                       : "r" (lines),
+                         "r" (bh_ptr[0]->b_data),
+                         "r" (bh_ptr[1]->b_data),
+                         "r" (bh_ptr[2]->b_data)
+                       : "memory" );
+                       break;
+               case 4:
+                       __asm__ __volatile__ (
+#undef BLOCK
+#define BLOCK(i) \
+               PF1(i)                                  \
+                               PF1(i+2)                \
+               LD(i,0)                                 \
+                       LD(i+1,1)                       \
+                               LD(i+2,2)               \
+                                       LD(i+3,3)       \
+               PF2(i)                                  \
+                               PF2(i+2)                \
+               XO1(i,0)                                \
+                       XO1(i+1,1)                      \
+                               XO1(i+2,2)              \
+                                       XO1(i+3,3)      \
+               PF3(i)                                  \
+                               PF3(i+2)                \
+               PF0(i+4)                                \
+                               PF0(i+6)                \
+               XO2(i,0)                                \
+                       XO2(i+1,1)                      \
+                               XO2(i+2,2)              \
+                                       XO2(i+3,3)      \
+               XO3(i,0)                                \
+                       XO3(i+1,1)                      \
+                               XO3(i+2,2)              \
+                                       XO3(i+3,3)      \
+               ST(i,0)                                 \
+                       ST(i+1,1)                       \
+                               ST(i+2,2)               \
+                                       ST(i+3,3)       \
+
+
+               PF0(0)
+                               PF0(2)
+
+       " .align 32,0x90                ;\n"
+        " 1:                            ;\n"
+
+               BLOCK(0)
+               BLOCK(4)
+               BLOCK(8)
+               BLOCK(12)
+
+        "       addl $256, %1           ;\n"
+        "       addl $256, %2           ;\n"
+        "       addl $256, %3           ;\n"
+        "       addl $256, %4           ;\n"
+        "       decl %0                 ;\n"
+        "       jnz 1b                  ;\n"
+
+                       :
+                       : "r" (lines),
+                         "r" (bh_ptr[0]->b_data),
+                         "r" (bh_ptr[1]->b_data),
+                         "r" (bh_ptr[2]->b_data),
+                         "r" (bh_ptr[3]->b_data)
+                       : "memory" );
+                       break;
+               case 5:
+                       __asm__ __volatile__ (
+#undef BLOCK
+#define BLOCK(i) \
+               PF1(i)                                  \
+                               PF1(i+2)                \
+               LD(i,0)                                 \
+                       LD(i+1,1)                       \
+                               LD(i+2,2)               \
+                                       LD(i+3,3)       \
+               PF2(i)                                  \
+                               PF2(i+2)                \
+               XO1(i,0)                                \
+                       XO1(i+1,1)                      \
+                               XO1(i+2,2)              \
+                                       XO1(i+3,3)      \
+               PF3(i)                                  \
+                               PF3(i+2)                \
+               XO2(i,0)                                \
+                       XO2(i+1,1)                      \
+                               XO2(i+2,2)              \
+                                       XO2(i+3,3)      \
+               PF4(i)                                  \
+                               PF4(i+2)                \
+               PF0(i+4)                                \
+                               PF0(i+6)                \
+               XO3(i,0)                                \
+                       XO3(i+1,1)                      \
+                               XO3(i+2,2)              \
+                                       XO3(i+3,3)      \
+               XO4(i,0)                                \
+                       XO4(i+1,1)                      \
+                               XO4(i+2,2)              \
+                                       XO4(i+3,3)      \
+               ST(i,0)                                 \
+                       ST(i+1,1)                       \
+                               ST(i+2,2)               \
+                                       ST(i+3,3)       \
+
+
+               PF0(0)
+                               PF0(2)
+
+       " .align 32,0x90                ;\n"
+        " 1:                            ;\n"
+
+               BLOCK(0)
+               BLOCK(4)
+               BLOCK(8)
+               BLOCK(12)
+
+        "       addl $256, %1           ;\n"
+        "       addl $256, %2           ;\n"
+        "       addl $256, %3           ;\n"
+        "       addl $256, %4           ;\n"
+        "       addl $256, %5           ;\n"
+        "       decl %0                 ;\n"
+        "       jnz 1b                  ;\n"
+
+                       :
+                       : "r" (lines),
+                         "r" (bh_ptr[0]->b_data),
+                         "r" (bh_ptr[1]->b_data),
+                         "r" (bh_ptr[2]->b_data),
+                         "r" (bh_ptr[3]->b_data),
+                         "r" (bh_ptr[4]->b_data)
+                       : "memory");
+                       break;
+       }
+
+       __asm__ __volatile__ ( 
+               "sfence                 ;\n\t"
+               "movups (%1),%%xmm0     ;\n\t"
+               "movups 0x10(%1),%%xmm1 ;\n\t"
+               "movups 0x20(%1),%%xmm2 ;\n\t"
+               "movups 0x30(%1),%%xmm3 ;\n\t"
+               "movl   %0,%%cr0        ;\n\t"
+               :
+               : "r" (cr0), "r" (xmm_save)
+               : "memory" );
+}
+
+#undef OFFS
+#undef LD
+#undef ST
+#undef PF0
+#undef PF1
+#undef PF2
+#undef PF3
+#undef PF4
+#undef PF5
+#undef XO1
+#undef XO2
+#undef XO3
+#undef XO4
+#undef XO5
+#undef BLOCK
+
+#endif /* CONFIG_X86_XMM */
+
+/*
+ * high-speed RAID5 checksumming functions utilizing MMX instructions
+ * Copyright (C) 1998 Ingo Molnar
+ */
+XORBLOCK_TEMPLATE(pII_mmx)
+{
+       char fpu_save[108];
+        int lines = (bh_ptr[0]->b_size>>7);
+
+       if (!(current->flags & PF_USEDFPU))
+               __asm__ __volatile__ ( " clts;\n");
+
+       __asm__ __volatile__ ( " fsave %0; fwait\n"::"m"(fpu_save[0]) );
+
+#define LD(x,y) \
+        "       movq   8*("#x")(%1), %%mm"#y"   ;\n"
+#define ST(x,y) \
+        "       movq %%mm"#y",   8*("#x")(%1)   ;\n"
+#define XO1(x,y) \
+        "       pxor   8*("#x")(%2), %%mm"#y"   ;\n"
+#define XO2(x,y) \
+        "       pxor   8*("#x")(%3), %%mm"#y"   ;\n"
+#define XO3(x,y) \
+        "       pxor   8*("#x")(%4), %%mm"#y"   ;\n"
+#define XO4(x,y) \
+        "       pxor   8*("#x")(%5), %%mm"#y"   ;\n"
+
+       switch(count) {
+               case 2:
+                       __asm__ __volatile__ (
+#undef BLOCK
+#define BLOCK(i) \
+                       LD(i,0)                                 \
+                               LD(i+1,1)                       \
+                                       LD(i+2,2)               \
+                                               LD(i+3,3)       \
+                       XO1(i,0)                                \
+                       ST(i,0)                                 \
+                               XO1(i+1,1)                      \
+                               ST(i+1,1)                       \
+                                       XO1(i+2,2)              \
+                                       ST(i+2,2)               \
+                                               XO1(i+3,3)      \
+                                               ST(i+3,3)
+
+                       " .align 32,0x90                ;\n"
+                       " 1:                            ;\n"
+
+                       BLOCK(0)
+                       BLOCK(4)
+                       BLOCK(8)
+                       BLOCK(12)
+
+                       "       addl $128, %1         ;\n"
+                       "       addl $128, %2         ;\n"
+                       "       decl %0               ;\n"
+                       "       jnz 1b                ;\n"
+                       :
+                       : "r" (lines),
+                         "r" (bh_ptr[0]->b_data),
+                         "r" (bh_ptr[1]->b_data)
+                       : "memory");
+                       break;
+               case 3:
+                       __asm__ __volatile__ (
+#undef BLOCK
+#define BLOCK(i) \
+                       LD(i,0)                                 \
+                               LD(i+1,1)                       \
+                                       LD(i+2,2)               \
+                                               LD(i+3,3)       \
+                       XO1(i,0)                                \
+                               XO1(i+1,1)                      \
+                                       XO1(i+2,2)              \
+                                               XO1(i+3,3)      \
+                       XO2(i,0)                                \
+                       ST(i,0)                                 \
+                               XO2(i+1,1)                      \
+                               ST(i+1,1)                       \
+                                       XO2(i+2,2)              \
+                                       ST(i+2,2)               \
+                                               XO2(i+3,3)      \
+                                               ST(i+3,3)
+
+                       " .align 32,0x90                ;\n"
+                       " 1:                            ;\n"
+
+                       BLOCK(0)
+                       BLOCK(4)
+                       BLOCK(8)
+                       BLOCK(12)
+
+                       "       addl $128, %1         ;\n"
+                       "       addl $128, %2         ;\n"
+                       "       addl $128, %3         ;\n"
+                       "       decl %0               ;\n"
+                       "       jnz 1b                ;\n"
+                       :
+                       : "r" (lines),
+                         "r" (bh_ptr[0]->b_data),
+                         "r" (bh_ptr[1]->b_data),
+                         "r" (bh_ptr[2]->b_data)
+                       : "memory");
+                       break;
+               case 4:
+                       __asm__ __volatile__ (
+#undef BLOCK
+#define BLOCK(i) \
+                       LD(i,0)                                 \
+                               LD(i+1,1)                       \
+                                       LD(i+2,2)               \
+                                               LD(i+3,3)       \
+                       XO1(i,0)                                \
+                               XO1(i+1,1)                      \
+                                       XO1(i+2,2)              \
+                                               XO1(i+3,3)      \
+                       XO2(i,0)                                \
+                               XO2(i+1,1)                      \
+                                       XO2(i+2,2)              \
+                                               XO2(i+3,3)      \
+                       XO3(i,0)                                \
+                       ST(i,0)                                 \
+                               XO3(i+1,1)                      \
+                               ST(i+1,1)                       \
+                                       XO3(i+2,2)              \
+                                       ST(i+2,2)               \
+                                               XO3(i+3,3)      \
+                                               ST(i+3,3)
+
+                       " .align 32,0x90                ;\n"
+                       " 1:                            ;\n"
+
+                       BLOCK(0)
+                       BLOCK(4)
+                       BLOCK(8)
+                       BLOCK(12)
+
+                       "       addl $128, %1         ;\n"
+                       "       addl $128, %2         ;\n"
+                       "       addl $128, %3         ;\n"
+                       "       addl $128, %4         ;\n"
+                       "       decl %0               ;\n"
+                       "       jnz 1b                ;\n"
+                       :
+                       : "r" (lines),
+                         "r" (bh_ptr[0]->b_data),
+                         "r" (bh_ptr[1]->b_data),
+                         "r" (bh_ptr[2]->b_data),
+                         "r" (bh_ptr[3]->b_data)
+                       : "memory");
+                       break;
+               case 5:
+                       __asm__ __volatile__ (
+#undef BLOCK
+#define BLOCK(i) \
+                       LD(i,0)                                 \
+                               LD(i+1,1)                       \
+                                       LD(i+2,2)               \
+                                               LD(i+3,3)       \
+                       XO1(i,0)                                \
+                               XO1(i+1,1)                      \
+                                       XO1(i+2,2)              \
+                                               XO1(i+3,3)      \
+                       XO2(i,0)                                \
+                               XO2(i+1,1)                      \
+                                       XO2(i+2,2)              \
+                                               XO2(i+3,3)      \
+                       XO3(i,0)                                \
+                               XO3(i+1,1)                      \
+                                       XO3(i+2,2)              \
+                                               XO3(i+3,3)      \
+                       XO4(i,0)                                \
+                       ST(i,0)                                 \
+                               XO4(i+1,1)                      \
+                               ST(i+1,1)                       \
+                                       XO4(i+2,2)              \
+                                       ST(i+2,2)               \
+                                               XO4(i+3,3)      \
+                                               ST(i+3,3)
+
+                       " .align 32,0x90                ;\n"
+                       " 1:                            ;\n"
+
+                       BLOCK(0)
+                       BLOCK(4)
+                       BLOCK(8)
+                       BLOCK(12)
+
+                       "       addl $128, %1         ;\n"
+                       "       addl $128, %2         ;\n"
+                       "       addl $128, %3         ;\n"
+                       "       addl $128, %4         ;\n"
+                       "       addl $128, %5         ;\n"
+                       "       decl %0               ;\n"
+                       "       jnz 1b                ;\n"
+                       :
+                       : "r" (lines),
+                         "r" (bh_ptr[0]->b_data),
+                         "r" (bh_ptr[1]->b_data),
+                         "r" (bh_ptr[2]->b_data),
+                         "r" (bh_ptr[3]->b_data),
+                         "r" (bh_ptr[4]->b_data)
+                       : "memory");
+                       break;
+       }
+
+       __asm__ __volatile__ ( " frstor %0;\n"::"m"(fpu_save[0]) );
+
+       if (!(current->flags & PF_USEDFPU))
+               stts();
+}
+
+#undef LD
+#undef XO1
+#undef XO2
+#undef XO3
+#undef XO4
+#undef ST
+#undef BLOCK
+
+XORBLOCK_TEMPLATE(p5_mmx)
+{
+       char fpu_save[108];
+        int lines = (bh_ptr[0]->b_size>>6);
+
+       if (!(current->flags & PF_USEDFPU))
+               __asm__ __volatile__ ( " clts;\n");
+
+       __asm__ __volatile__ ( " fsave %0; fwait\n"::"m"(fpu_save[0]) );
+
+       switch(count) {
+               case 2:
+                       __asm__ __volatile__ (
+
+                               " .align 32,0x90             ;\n"
+                               " 1:                         ;\n"
+                               "       movq   (%1), %%mm0   ;\n"
+                               "       movq  8(%1), %%mm1   ;\n"
+                               "       pxor   (%2), %%mm0   ;\n"
+                               "       movq 16(%1), %%mm2   ;\n"
+                               "       movq %%mm0,   (%1)   ;\n"
+                               "       pxor  8(%2), %%mm1   ;\n"
+                               "       movq 24(%1), %%mm3   ;\n"
+                               "       movq %%mm1,  8(%1)   ;\n"
+                               "       pxor 16(%2), %%mm2   ;\n"
+                               "       movq 32(%1), %%mm4   ;\n"
+                               "       movq %%mm2, 16(%1)   ;\n"
+                               "       pxor 24(%2), %%mm3   ;\n"
+                               "       movq 40(%1), %%mm5   ;\n"
+                               "       movq %%mm3, 24(%1)   ;\n"
+                               "       pxor 32(%2), %%mm4   ;\n"
+                               "       movq 48(%1), %%mm6   ;\n"
+                               "       movq %%mm4, 32(%1)   ;\n"
+                               "       pxor 40(%2), %%mm5   ;\n"
+                               "       movq 56(%1), %%mm7   ;\n"
+                               "       movq %%mm5, 40(%1)   ;\n"
+                               "       pxor 48(%2), %%mm6   ;\n"
+                               "       pxor 56(%2), %%mm7   ;\n"
+                               "       movq %%mm6, 48(%1)   ;\n"
+                               "       movq %%mm7, 56(%1)   ;\n"
+        
+                               "       addl $64, %1         ;\n"
+                               "       addl $64, %2         ;\n"
+                               "       decl %0              ;\n"
+                               "       jnz 1b               ;\n"
+
+                               : 
+                               : "r" (lines),
+                                 "r" (bh_ptr[0]->b_data),
+                                 "r" (bh_ptr[1]->b_data)
+                               : "memory" );
+                       break;
+               case 3:
+                       __asm__ __volatile__ (
+
+                               " .align 32,0x90             ;\n"
+                               " 1:                         ;\n"
+                               "       movq   (%1), %%mm0   ;\n"
+                               "       movq  8(%1), %%mm1   ;\n"
+                               "       pxor   (%2), %%mm0   ;\n"
+                               "       movq 16(%1), %%mm2   ;\n"
+                               "       pxor  8(%2), %%mm1   ;\n"
+                               "       pxor   (%3), %%mm0   ;\n"
+                               "       pxor 16(%2), %%mm2   ;\n"
+                               "       movq %%mm0,   (%1)   ;\n"
+                               "       pxor  8(%3), %%mm1   ;\n"
+                               "       pxor 16(%3), %%mm2   ;\n"
+                               "       movq 24(%1), %%mm3   ;\n"
+                               "       movq %%mm1,  8(%1)   ;\n"
+                               "       movq 32(%1), %%mm4   ;\n"
+                               "       movq 40(%1), %%mm5   ;\n"
+                               "       pxor 24(%2), %%mm3   ;\n"
+                               "       movq %%mm2, 16(%1)   ;\n"
+                               "       pxor 32(%2), %%mm4   ;\n"
+                               "       pxor 24(%3), %%mm3   ;\n"
+                               "       pxor 40(%2), %%mm5   ;\n"
+                               "       movq %%mm3, 24(%1)   ;\n"
+                               "       pxor 32(%3), %%mm4   ;\n"
+                               "       pxor 40(%3), %%mm5   ;\n"
+                               "       movq 48(%1), %%mm6   ;\n"
+                               "       movq %%mm4, 32(%1)   ;\n"
+                               "       movq 56(%1), %%mm7   ;\n"
+                               "       pxor 48(%2), %%mm6   ;\n"
+                               "       movq %%mm5, 40(%1)   ;\n"
+                               "       pxor 56(%2), %%mm7   ;\n"
+                               "       pxor 48(%3), %%mm6   ;\n"
+                               "       pxor 56(%3), %%mm7   ;\n"
+                               "       movq %%mm6, 48(%1)   ;\n"
+                               "       movq %%mm7, 56(%1)   ;\n"
+        
+                               "       addl $64, %1         ;\n"
+                               "       addl $64, %2         ;\n"
+                               "       addl $64, %3         ;\n"
+                               "       decl %0              ;\n"
+                               "       jnz 1b               ;\n"
+
+                               : 
+                               : "r" (lines),
+                                 "r" (bh_ptr[0]->b_data),
+                                 "r" (bh_ptr[1]->b_data),
+                                 "r" (bh_ptr[2]->b_data)
+                               : "memory" );
+                       break;
+               case 4:
+                       __asm__ __volatile__ (
+
+                               " .align 32,0x90             ;\n"
+                               " 1:                         ;\n"
+                               "       movq   (%1), %%mm0   ;\n"
+                               "       movq  8(%1), %%mm1   ;\n"
+                               "       pxor   (%2), %%mm0   ;\n"
+                               "       movq 16(%1), %%mm2   ;\n"
+                               "       pxor  8(%2), %%mm1   ;\n"
+                               "       pxor   (%3), %%mm0   ;\n"
+                               "       pxor 16(%2), %%mm2   ;\n"
+                               "       pxor  8(%3), %%mm1   ;\n"
+                               "       pxor   (%4), %%mm0   ;\n"
+                               "       movq 24(%1), %%mm3   ;\n"
+                               "       pxor 16(%3), %%mm2   ;\n"
+                               "       pxor  8(%4), %%mm1   ;\n"
+                               "       movq %%mm0,   (%1)   ;\n"
+                               "       movq 32(%1), %%mm4   ;\n"
+                               "       pxor 24(%2), %%mm3   ;\n"
+                               "       pxor 16(%4), %%mm2   ;\n"
+                               "       movq %%mm1,  8(%1)   ;\n"
+                               "       movq 40(%1), %%mm5   ;\n"
+                               "       pxor 32(%2), %%mm4   ;\n"
+                               "       pxor 24(%3), %%mm3   ;\n"
+                               "       movq %%mm2, 16(%1)   ;\n"
+                               "       pxor 40(%2), %%mm5   ;\n"
+                               "       pxor 32(%3), %%mm4   ;\n"
+                               "       pxor 24(%4), %%mm3   ;\n"
+                               "       movq %%mm3, 24(%1)   ;\n"
+                               "       movq 56(%1), %%mm7   ;\n"
+                               "       movq 48(%1), %%mm6   ;\n"
+                               "       pxor 40(%3), %%mm5   ;\n"
+                               "       pxor 32(%4), %%mm4   ;\n"
+                               "       pxor 48(%2), %%mm6   ;\n"
+                               "       movq %%mm4, 32(%1)   ;\n"
+                               "       pxor 56(%2), %%mm7   ;\n"
+                               "       pxor 40(%4), %%mm5   ;\n"
+                               "       pxor 48(%3), %%mm6   ;\n"
+                               "       pxor 56(%3), %%mm7   ;\n"
+                               "       movq %%mm5, 40(%1)   ;\n"
+                               "       pxor 48(%4), %%mm6   ;\n"
+                               "       pxor 56(%4), %%mm7   ;\n"
+                               "       movq %%mm6, 48(%1)   ;\n"
+                               "       movq %%mm7, 56(%1)   ;\n"
+        
+                               "       addl $64, %1         ;\n"
+                               "       addl $64, %2         ;\n"
+                               "       addl $64, %3         ;\n"
+                               "       addl $64, %4         ;\n"
+                               "       decl %0              ;\n"
+                               "       jnz 1b               ;\n"
+
+                               : 
+                               : "r" (lines),
+                                 "r" (bh_ptr[0]->b_data),
+                                 "r" (bh_ptr[1]->b_data),
+                                 "r" (bh_ptr[2]->b_data),
+                                 "r" (bh_ptr[3]->b_data)
+                               : "memory" );
+                       break;
+               case 5:
+                       __asm__ __volatile__ (
+
+                               " .align 32,0x90             ;\n"
+                               " 1:                         ;\n"
+                               "       movq   (%1), %%mm0   ;\n"
+                               "       movq  8(%1), %%mm1   ;\n"
+                               "       pxor   (%2), %%mm0   ;\n"
+                               "       pxor  8(%2), %%mm1   ;\n"
+                               "       movq 16(%1), %%mm2   ;\n"
+                               "       pxor   (%3), %%mm0   ;\n"
+                               "       pxor  8(%3), %%mm1   ;\n"
+                               "       pxor 16(%2), %%mm2   ;\n"
+                               "       pxor   (%4), %%mm0   ;\n"
+                               "       pxor  8(%4), %%mm1   ;\n"
+                               "       pxor 16(%3), %%mm2   ;\n"
+                               "       movq 24(%1), %%mm3   ;\n"
+                               "       pxor   (%5), %%mm0   ;\n"
+                               "       pxor  8(%5), %%mm1   ;\n"
+                               "       movq %%mm0,   (%1)   ;\n"
+                               "       pxor 16(%4), %%mm2   ;\n"
+                               "       pxor 24(%2), %%mm3   ;\n"
+                               "       movq %%mm1,  8(%1)   ;\n"
+                               "       pxor 16(%5), %%mm2   ;\n"
+                               "       pxor 24(%3), %%mm3   ;\n"
+                               "       movq 32(%1), %%mm4   ;\n"
+                               "       movq %%mm2, 16(%1)   ;\n"
+                               "       pxor 24(%4), %%mm3   ;\n"
+                               "       pxor 32(%2), %%mm4   ;\n"
+                               "       movq 40(%1), %%mm5   ;\n"
+                               "       pxor 24(%5), %%mm3   ;\n"
+                               "       pxor 32(%3), %%mm4   ;\n"
+                               "       pxor 40(%2), %%mm5   ;\n"
+                               "       movq %%mm3, 24(%1)   ;\n"
+                               "       pxor 32(%4), %%mm4   ;\n"
+                               "       pxor 40(%3), %%mm5   ;\n"
+                               "       movq 48(%1), %%mm6   ;\n"
+                               "       movq 56(%1), %%mm7   ;\n"
+                               "       pxor 32(%5), %%mm4   ;\n"
+                               "       pxor 40(%4), %%mm5   ;\n"
+                               "       pxor 48(%2), %%mm6   ;\n"
+                               "       pxor 56(%2), %%mm7   ;\n"
+                               "       movq %%mm4, 32(%1)   ;\n"
+                               "       pxor 48(%3), %%mm6   ;\n"
+                               "       pxor 56(%3), %%mm7   ;\n"
+                               "       pxor 40(%5), %%mm5   ;\n"
+                               "       pxor 48(%4), %%mm6   ;\n"
+                               "       pxor 56(%4), %%mm7   ;\n"
+                               "       movq %%mm5, 40(%1)   ;\n"
+                               "       pxor 48(%5), %%mm6   ;\n"
+                               "       pxor 56(%5), %%mm7   ;\n"
+                               "       movq %%mm6, 48(%1)   ;\n"
+                               "       movq %%mm7, 56(%1)   ;\n"
+        
+                               "       addl $64, %1         ;\n"
+                               "       addl $64, %2         ;\n"
+                               "       addl $64, %3         ;\n"
+                               "       addl $64, %4         ;\n"
+                               "       addl $64, %5         ;\n"
+                               "       decl %0              ;\n"
+                               "       jnz 1b               ;\n"
+
+                               : 
+                               : "r" (lines),
+                                 "r" (bh_ptr[0]->b_data),
+                                 "r" (bh_ptr[1]->b_data),
+                                 "r" (bh_ptr[2]->b_data),
+                                 "r" (bh_ptr[3]->b_data),
+                                 "r" (bh_ptr[4]->b_data)
+                               : "memory" );
+                       break;
+       }
+
+       __asm__ __volatile__ ( " frstor %0;\n"::"m"(fpu_save[0]) );
+
+       if (!(current->flags & PF_USEDFPU))
+               stts();
+}
+#endif /* __i386__ */
+#endif /* !__sparc_v9__ */
+
+#ifdef __sparc_v9__
+/*
+ * High speed xor_block operation for RAID4/5 utilizing the
+ * UltraSparc Visual Instruction Set.
+ *
+ * Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz)
+ *
+ *     Requirements:
+ *     !(((long)dest | (long)sourceN) & (64 - 1)) &&
+ *     !(len & 127) && len >= 256
+ *
+ * It is done in pure assembly, as otherwise gcc makes it
+ * a non-leaf function, which is not what we want.
+ * Also, we don't measure the speeds as on other architectures,
+ * as the measuring routine does not take into account cold caches
+ * and the fact that xor_block_VIS bypasses the caches.
+ * xor_block_32regs might be 5% faster for count 2 if caches are hot
+ * and things just right (for count 3 VIS is about as fast as 32regs for
+ * hot caches and for count 4 and 5 VIS is faster by good margin always),
+ * but I think it is better not to pollute the caches.
+ * Actually, if I'd just fight for speed for hot caches, I could
+ * write a hybrid VIS/integer routine, which would do always two
+ * 64B blocks in VIS and two in IEUs, but I really care more about
+ * caches.
+ */
+extern void *VISenter(void);
+extern void xor_block_VIS XOR_ARGS;
+
+void __xor_block_VIS(void)
+{
+__asm__ ("
+       .globl xor_block_VIS
+xor_block_VIS:
+       ldx     [%%o1 + 0], %%o4
+       ldx     [%%o1 + 8], %%o3
+       ldx     [%%o4 + %1], %%g5
+       ldx     [%%o4 + %0], %%o4
+       ldx     [%%o3 + %0], %%o3
+       rd      %%fprs, %%o5
+       andcc   %%o5, %2, %%g0
+       be,pt   %%icc, 297f
+        sethi  %%hi(%5), %%g1
+       jmpl    %%g1 + %%lo(%5), %%g7
+        add    %%g7, 8, %%g7
+297:   wr      %%g0, %4, %%fprs
+       membar  #LoadStore|#StoreLoad|#StoreStore
+       sub     %%g5, 64, %%g5
+       ldda    [%%o4] %3, %%f0
+       ldda    [%%o3] %3, %%f16
+       cmp     %%o0, 4
+       bgeu,pt %%xcc, 10f
+        cmp    %%o0, 3
+       be,pn   %%xcc, 13f
+        mov    -64, %%g1
+       sub     %%g5, 64, %%g5
+       rd      %%asi, %%g1
+       wr      %%g0, %3, %%asi
+
+2:     ldda    [%%o4 + 64] %%asi, %%f32
+       fxor    %%f0, %%f16, %%f16
+       fxor    %%f2, %%f18, %%f18
+       fxor    %%f4, %%f20, %%f20
+       fxor    %%f6, %%f22, %%f22
+       fxor    %%f8, %%f24, %%f24
+       fxor    %%f10, %%f26, %%f26
+       fxor    %%f12, %%f28, %%f28
+       fxor    %%f14, %%f30, %%f30
+       stda    %%f16, [%%o4] %3
+       ldda    [%%o3 + 64] %%asi, %%f48
+       ldda    [%%o4 + 128] %%asi, %%f0
+       fxor    %%f32, %%f48, %%f48
+       fxor    %%f34, %%f50, %%f50
+       add     %%o4, 128, %%o4
+       fxor    %%f36, %%f52, %%f52
+       add     %%o3, 128, %%o3
+       fxor    %%f38, %%f54, %%f54
+       subcc   %%g5, 128, %%g5
+       fxor    %%f40, %%f56, %%f56
+       fxor    %%f42, %%f58, %%f58
+       fxor    %%f44, %%f60, %%f60
+       fxor    %%f46, %%f62, %%f62
+       stda    %%f48, [%%o4 - 64] %%asi
+       bne,pt  %%xcc, 2b
+        ldda   [%%o3] %3, %%f16
+
+       ldda    [%%o4 + 64] %%asi, %%f32
+       fxor    %%f0, %%f16, %%f16
+       fxor    %%f2, %%f18, %%f18
+       fxor    %%f4, %%f20, %%f20
+       fxor    %%f6, %%f22, %%f22
+       fxor    %%f8, %%f24, %%f24
+       fxor    %%f10, %%f26, %%f26
+       fxor    %%f12, %%f28, %%f28
+       fxor    %%f14, %%f30, %%f30
+       stda    %%f16, [%%o4] %3
+       ldda    [%%o3 + 64] %%asi, %%f48
+       membar  #Sync
+       fxor    %%f32, %%f48, %%f48
+       fxor    %%f34, %%f50, %%f50
+       fxor    %%f36, %%f52, %%f52
+       fxor    %%f38, %%f54, %%f54
+       fxor    %%f40, %%f56, %%f56
+       fxor    %%f42, %%f58, %%f58
+       fxor    %%f44, %%f60, %%f60
+       fxor    %%f46, %%f62, %%f62
+       stda    %%f48, [%%o4 + 64] %%asi
+       membar  #Sync|#StoreStore|#StoreLoad
+       wr      %%g0, 0, %%fprs
+       retl
+        wr     %%g1, %%g0, %%asi
+
+13:    ldx     [%%o1 + 16], %%o2
+       ldx     [%%o2 + %0], %%o2
+
+3:     ldda    [%%o2] %3, %%f32
+       fxor    %%f0, %%f16, %%f48
+       fxor    %%f2, %%f18, %%f50
+       add     %%o4, 64, %%o4
+       fxor    %%f4, %%f20, %%f52
+       fxor    %%f6, %%f22, %%f54
+       add     %%o3, 64, %%o3
+       fxor    %%f8, %%f24, %%f56
+       fxor    %%f10, %%f26, %%f58
+       fxor    %%f12, %%f28, %%f60
+       fxor    %%f14, %%f30, %%f62
+       ldda    [%%o4] %3, %%f0
+       fxor    %%f48, %%f32, %%f48
+       fxor    %%f50, %%f34, %%f50
+       fxor    %%f52, %%f36, %%f52
+       fxor    %%f54, %%f38, %%f54
+       add     %%o2, 64, %%o2
+       fxor    %%f56, %%f40, %%f56
+       fxor    %%f58, %%f42, %%f58
+       subcc   %%g5, 64, %%g5
+       fxor    %%f60, %%f44, %%f60
+       fxor    %%f62, %%f46, %%f62
+       stda    %%f48, [%%o4 + %%g1] %3
+       bne,pt  %%xcc, 3b
+        ldda   [%%o3] %3, %%f16
+
+       ldda    [%%o2] %3, %%f32
+       fxor    %%f0, %%f16, %%f48
+       fxor    %%f2, %%f18, %%f50
+       fxor    %%f4, %%f20, %%f52
+       fxor    %%f6, %%f22, %%f54
+       fxor    %%f8, %%f24, %%f56
+       fxor    %%f10, %%f26, %%f58
+       fxor    %%f12, %%f28, %%f60
+       fxor    %%f14, %%f30, %%f62
+       membar  #Sync
+       fxor    %%f48, %%f32, %%f48
+       fxor    %%f50, %%f34, %%f50
+       fxor    %%f52, %%f36, %%f52
+       fxor    %%f54, %%f38, %%f54
+       fxor    %%f56, %%f40, %%f56
+       fxor    %%f58, %%f42, %%f58
+       fxor    %%f60, %%f44, %%f60
+       fxor    %%f62, %%f46, %%f62
+       stda    %%f48, [%%o4] %3
+       membar  #Sync|#StoreStore|#StoreLoad
+       retl
+        wr     %%g0, 0, %%fprs
+
+10:    cmp     %%o0, 5
+       be,pt   %%xcc, 15f
+        mov    -64, %%g1
+
+14:    ldx     [%%o1 + 16], %%o2
+       ldx     [%%o1 + 24], %%o0
+       ldx     [%%o2 + %0], %%o2
+       ldx     [%%o0 + %0], %%o0
+
+4:     ldda    [%%o2] %3, %%f32
+       fxor    %%f0, %%f16, %%f16
+       fxor    %%f2, %%f18, %%f18
+       add     %%o4, 64, %%o4
+       fxor    %%f4, %%f20, %%f20
+       fxor    %%f6, %%f22, %%f22
+       add     %%o3, 64, %%o3
+       fxor    %%f8, %%f24, %%f24
+       fxor    %%f10, %%f26, %%f26
+       fxor    %%f12, %%f28, %%f28
+       fxor    %%f14, %%f30, %%f30
+       ldda    [%%o0] %3, %%f48
+       fxor    %%f16, %%f32, %%f32
+       fxor    %%f18, %%f34, %%f34
+       fxor    %%f20, %%f36, %%f36
+       fxor    %%f22, %%f38, %%f38
+       add     %%o2, 64, %%o2
+       fxor    %%f24, %%f40, %%f40
+       fxor    %%f26, %%f42, %%f42
+       fxor    %%f28, %%f44, %%f44
+       fxor    %%f30, %%f46, %%f46
+       ldda    [%%o4] %3, %%f0
+       fxor    %%f32, %%f48, %%f48
+       fxor    %%f34, %%f50, %%f50
+       fxor    %%f36, %%f52, %%f52
+       add     %%o0, 64, %%o0
+       fxor    %%f38, %%f54, %%f54
+       fxor    %%f40, %%f56, %%f56
+       fxor    %%f42, %%f58, %%f58
+       subcc   %%g5, 64, %%g5
+       fxor    %%f44, %%f60, %%f60
+       fxor    %%f46, %%f62, %%f62
+       stda    %%f48, [%%o4 + %%g1] %3
+       bne,pt  %%xcc, 4b
+        ldda   [%%o3] %3, %%f16
+
+       ldda    [%%o2] %3, %%f32
+       fxor    %%f0, %%f16, %%f16
+       fxor    %%f2, %%f18, %%f18
+       fxor    %%f4, %%f20, %%f20
+       fxor    %%f6, %%f22, %%f22
+       fxor    %%f8, %%f24, %%f24
+       fxor    %%f10, %%f26, %%f26
+       fxor    %%f12, %%f28, %%f28
+       fxor    %%f14, %%f30, %%f30
+       ldda    [%%o0] %3, %%f48
+       fxor    %%f16, %%f32, %%f32
+       fxor    %%f18, %%f34, %%f34
+       fxor    %%f20, %%f36, %%f36
+       fxor    %%f22, %%f38, %%f38
+       fxor    %%f24, %%f40, %%f40
+       fxor    %%f26, %%f42, %%f42
+       fxor    %%f28, %%f44, %%f44
+       fxor    %%f30, %%f46, %%f46
+       membar  #Sync
+       fxor    %%f32, %%f48, %%f48
+       fxor    %%f34, %%f50, %%f50
+       fxor    %%f36, %%f52, %%f52
+       fxor    %%f38, %%f54, %%f54
+       fxor    %%f40, %%f56, %%f56
+       fxor    %%f42, %%f58, %%f58
+       fxor    %%f44, %%f60, %%f60
+       fxor    %%f46, %%f62, %%f62
+       stda    %%f48, [%%o4] %3
+       membar  #Sync|#StoreStore|#StoreLoad
+       retl
+        wr     %%g0, 0, %%fprs
+
+15:    ldx     [%%o1 + 16], %%o2
+       ldx     [%%o1 + 24], %%o0
+       ldx     [%%o1 + 32], %%o1
+       ldx     [%%o2 + %0], %%o2
+       ldx     [%%o0 + %0], %%o0
+       ldx     [%%o1 + %0], %%o1
+
+5:     ldda    [%%o2] %3, %%f32
+       fxor    %%f0, %%f16, %%f48
+       fxor    %%f2, %%f18, %%f50
+       add     %%o4, 64, %%o4
+       fxor    %%f4, %%f20, %%f52
+       fxor    %%f6, %%f22, %%f54
+       add     %%o3, 64, %%o3
+       fxor    %%f8, %%f24, %%f56
+       fxor    %%f10, %%f26, %%f58
+       fxor    %%f12, %%f28, %%f60
+       fxor    %%f14, %%f30, %%f62
+       ldda    [%%o0] %3, %%f16
+       fxor    %%f48, %%f32, %%f48
+       fxor    %%f50, %%f34, %%f50
+       fxor    %%f52, %%f36, %%f52
+       fxor    %%f54, %%f38, %%f54
+       add     %%o2, 64, %%o2
+       fxor    %%f56, %%f40, %%f56
+       fxor    %%f58, %%f42, %%f58
+       fxor    %%f60, %%f44, %%f60
+       fxor    %%f62, %%f46, %%f62
+       ldda    [%%o1] %3, %%f32
+       fxor    %%f48, %%f16, %%f48
+       fxor    %%f50, %%f18, %%f50
+       add     %%o0, 64, %%o0
+       fxor    %%f52, %%f20, %%f52
+       fxor    %%f54, %%f22, %%f54
+       add     %%o1, 64, %%o1
+       fxor    %%f56, %%f24, %%f56
+       fxor    %%f58, %%f26, %%f58
+       fxor    %%f60, %%f28, %%f60
+       fxor    %%f62, %%f30, %%f62
+       ldda    [%%o4] %3, %%f0
+       fxor    %%f48, %%f32, %%f48
+       fxor    %%f50, %%f34, %%f50
+       fxor    %%f52, %%f36, %%f52
+       fxor    %%f54, %%f38, %%f54
+       fxor    %%f56, %%f40, %%f56
+       fxor    %%f58, %%f42, %%f58
+       subcc   %%g5, 64, %%g5
+       fxor    %%f60, %%f44, %%f60
+       fxor    %%f62, %%f46, %%f62
+       stda    %%f48, [%%o4 + %%g1] %3
+       bne,pt  %%xcc, 5b
+        ldda   [%%o3] %3, %%f16
+
+       ldda    [%%o2] %3, %%f32
+       fxor    %%f0, %%f16, %%f48
+       fxor    %%f2, %%f18, %%f50
+       fxor    %%f4, %%f20, %%f52
+       fxor    %%f6, %%f22, %%f54
+       fxor    %%f8, %%f24, %%f56
+       fxor    %%f10, %%f26, %%f58
+       fxor    %%f12, %%f28, %%f60
+       fxor    %%f14, %%f30, %%f62
+       ldda    [%%o0] %3, %%f16
+       fxor    %%f48, %%f32, %%f48
+       fxor    %%f50, %%f34, %%f50
+       fxor    %%f52, %%f36, %%f52
+       fxor    %%f54, %%f38, %%f54
+       fxor    %%f56, %%f40, %%f56
+       fxor    %%f58, %%f42, %%f58
+       fxor    %%f60, %%f44, %%f60
+       fxor    %%f62, %%f46, %%f62
+       ldda    [%%o1] %3, %%f32
+       fxor    %%f48, %%f16, %%f48
+       fxor    %%f50, %%f18, %%f50
+       fxor    %%f52, %%f20, %%f52
+       fxor    %%f54, %%f22, %%f54
+       fxor    %%f56, %%f24, %%f56
+       fxor    %%f58, %%f26, %%f58
+       fxor    %%f60, %%f28, %%f60
+       fxor    %%f62, %%f30, %%f62
+       membar  #Sync
+       fxor    %%f48, %%f32, %%f48
+       fxor    %%f50, %%f34, %%f50
+       fxor    %%f52, %%f36, %%f52
+       fxor    %%f54, %%f38, %%f54
+       fxor    %%f56, %%f40, %%f56
+       fxor    %%f58, %%f42, %%f58
+       fxor    %%f60, %%f44, %%f60
+       fxor    %%f62, %%f46, %%f62
+       stda    %%f48, [%%o4] %3
+       membar  #Sync|#StoreStore|#StoreLoad
+       retl
+        wr     %%g0, 0, %%fprs
+       " : :
+       "i" (&((struct buffer_head *)0)->b_data),
+       "i" (&((struct buffer_head *)0)->b_size),
+       "i" (FPRS_FEF|FPRS_DU), "i" (ASI_BLK_P),
+       "i" (FPRS_FEF), "i" (VISenter));
+}
+#endif /* __sparc_v9__ */
+
+#if defined(__sparc__) && !defined(__sparc_v9__)
+/*
+ * High speed xor_block operation for RAID4/5 utilizing the
+ * ldd/std SPARC instructions.
+ *
+ * Copyright (C) 1999 Jakub Jelinek (jj@ultra.linux.cz)
+ *
+ */
+
+XORBLOCK_TEMPLATE(SPARC)
+{
+       int size  = bh_ptr[0]->b_size;
+       int lines = size / (sizeof (long)) / 8, i;
+       long *destp   = (long *) bh_ptr[0]->b_data;
+       long *source1 = (long *) bh_ptr[1]->b_data;
+       long *source2, *source3, *source4;
+
+       switch (count) {
+       case 2:
+               for (i = lines; i > 0; i--) {
+                 __asm__ __volatile__("
+                 ldd [%0 + 0x00], %%g2
+                 ldd [%0 + 0x08], %%g4
+                 ldd [%0 + 0x10], %%o0
+                 ldd [%0 + 0x18], %%o2
+                 ldd [%1 + 0x00], %%o4
+                 ldd [%1 + 0x08], %%l0
+                 ldd [%1 + 0x10], %%l2
+                 ldd [%1 + 0x18], %%l4
+                 xor %%g2, %%o4, %%g2
+                 xor %%g3, %%o5, %%g3
+                 xor %%g4, %%l0, %%g4
+                 xor %%g5, %%l1, %%g5
+                 xor %%o0, %%l2, %%o0
+                 xor %%o1, %%l3, %%o1
+                 xor %%o2, %%l4, %%o2
+                 xor %%o3, %%l5, %%o3
+                 std %%g2, [%0 + 0x00]
+                 std %%g4, [%0 + 0x08]
+                 std %%o0, [%0 + 0x10]
+                 std %%o2, [%0 + 0x18]
+                 " : : "r" (destp), "r" (source1) : "g2", "g3", "g4", "g5", "o0", 
+                 "o1", "o2", "o3", "o4", "o5", "l0", "l1", "l2", "l3", "l4", "l5");
+                 destp += 8;
+                 source1 += 8;
+               }
+               break;
+       case 3:
+               source2 = (long *) bh_ptr[2]->b_data;
+               for (i = lines; i > 0; i--) {
+                 __asm__ __volatile__("
+                 ldd [%0 + 0x00], %%g2
+                 ldd [%0 + 0x08], %%g4
+                 ldd [%0 + 0x10], %%o0
+                 ldd [%0 + 0x18], %%o2
+                 ldd [%1 + 0x00], %%o4
+                 ldd [%1 + 0x08], %%l0
+                 ldd [%1 + 0x10], %%l2
+                 ldd [%1 + 0x18], %%l4
+                 xor %%g2, %%o4, %%g2
+                 xor %%g3, %%o5, %%g3
+                 ldd [%2 + 0x00], %%o4
+                 xor %%g4, %%l0, %%g4
+                 xor %%g5, %%l1, %%g5
+                 ldd [%2 + 0x08], %%l0
+                 xor %%o0, %%l2, %%o0
+                 xor %%o1, %%l3, %%o1
+                 ldd [%2 + 0x10], %%l2
+                 xor %%o2, %%l4, %%o2
+                 xor %%o3, %%l5, %%o3
+                 ldd [%2 + 0x18], %%l4
+                 xor %%g2, %%o4, %%g2
+                 xor %%g3, %%o5, %%g3
+                 xor %%g4, %%l0, %%g4
+                 xor %%g5, %%l1, %%g5
+                 xor %%o0, %%l2, %%o0
+                 xor %%o1, %%l3, %%o1
+                 xor %%o2, %%l4, %%o2
+                 xor %%o3, %%l5, %%o3
+                 std %%g2, [%0 + 0x00]
+                 std %%g4, [%0 + 0x08]
+                 std %%o0, [%0 + 0x10]
+                 std %%o2, [%0 + 0x18]
+                 " : : "r" (destp), "r" (source1), "r" (source2)
+                 : "g2", "g3", "g4", "g5", "o0", "o1", "o2", "o3", "o4", "o5",
+                 "l0", "l1", "l2", "l3", "l4", "l5");
+                 destp += 8;
+                 source1 += 8;
+                 source2 += 8;
+               }
+               break;
+       case 4:
+               source2 = (long *) bh_ptr[2]->b_data;
+               source3 = (long *) bh_ptr[3]->b_data;
+               for (i = lines; i > 0; i--) {
+                 __asm__ __volatile__("
+                 ldd [%0 + 0x00], %%g2
+                 ldd [%0 + 0x08], %%g4
+                 ldd [%0 + 0x10], %%o0
+                 ldd [%0 + 0x18], %%o2
+                 ldd [%1 + 0x00], %%o4
+                 ldd [%1 + 0x08], %%l0
+                 ldd [%1 + 0x10], %%l2
+                 ldd [%1 + 0x18], %%l4
+                 xor %%g2, %%o4, %%g2
+                 xor %%g3, %%o5, %%g3
+                 ldd [%2 + 0x00], %%o4
+                 xor %%g4, %%l0, %%g4
+                 xor %%g5, %%l1, %%g5
+                 ldd [%2 + 0x08], %%l0
+                 xor %%o0, %%l2, %%o0
+                 xor %%o1, %%l3, %%o1
+                 ldd [%2 + 0x10], %%l2
+                 xor %%o2, %%l4, %%o2
+                 xor %%o3, %%l5, %%o3
+                 ldd [%2 + 0x18], %%l4
+                 xor %%g2, %%o4, %%g2
+                 xor %%g3, %%o5, %%g3
+                 ldd [%3 + 0x00], %%o4
+                 xor %%g4, %%l0, %%g4
+                 xor %%g5, %%l1, %%g5
+                 ldd [%3 + 0x08], %%l0
+                 xor %%o0, %%l2, %%o0
+                 xor %%o1, %%l3, %%o1
+                 ldd [%3 + 0x10], %%l2
+                 xor %%o2, %%l4, %%o2
+                 xor %%o3, %%l5, %%o3
+                 ldd [%3 + 0x18], %%l4
+                 xor %%g2, %%o4, %%g2
+                 xor %%g3, %%o5, %%g3
+                 xor %%g4, %%l0, %%g4
+                 xor %%g5, %%l1, %%g5
+                 xor %%o0, %%l2, %%o0
+                 xor %%o1, %%l3, %%o1
+                 xor %%o2, %%l4, %%o2
+                 xor %%o3, %%l5, %%o3
+                 std %%g2, [%0 + 0x00]
+                 std %%g4, [%0 + 0x08]
+                 std %%o0, [%0 + 0x10]
+                 std %%o2, [%0 + 0x18]
+                 " : : "r" (destp), "r" (source1), "r" (source2), "r" (source3)
+                 : "g2", "g3", "g4", "g5", "o0", "o1", "o2", "o3", "o4", "o5",
+                 "l0", "l1", "l2", "l3", "l4", "l5");
+                 destp += 8;
+                 source1 += 8;
+                 source2 += 8;
+                 source3 += 8;
+               }
+               break;
+       case 5:
+               source2 = (long *) bh_ptr[2]->b_data;
+               source3 = (long *) bh_ptr[3]->b_data;
+               source4 = (long *) bh_ptr[4]->b_data;
+               for (i = lines; i > 0; i--) {
+                 __asm__ __volatile__("
+                 ldd [%0 + 0x00], %%g2
+                 ldd [%0 + 0x08], %%g4
+                 ldd [%0 + 0x10], %%o0
+                 ldd [%0 + 0x18], %%o2
+                 ldd [%1 + 0x00], %%o4
+                 ldd [%1 + 0x08], %%l0
+                 ldd [%1 + 0x10], %%l2
+                 ldd [%1 + 0x18], %%l4
+                 xor %%g2, %%o4, %%g2
+                 xor %%g3, %%o5, %%g3
+                 ldd [%2 + 0x00], %%o4
+                 xor %%g4, %%l0, %%g4
+                 xor %%g5, %%l1, %%g5
+                 ldd [%2 + 0x08], %%l0
+                 xor %%o0, %%l2, %%o0
+                 xor %%o1, %%l3, %%o1
+                 ldd [%2 + 0x10], %%l2
+                 xor %%o2, %%l4, %%o2
+                 xor %%o3, %%l5, %%o3
+                 ldd [%2 + 0x18], %%l4
+                 xor %%g2, %%o4, %%g2
+                 xor %%g3, %%o5, %%g3
+                 ldd [%3 + 0x00], %%o4
+                 xor %%g4, %%l0, %%g4
+                 xor %%g5, %%l1, %%g5
+                 ldd [%3 + 0x08], %%l0
+                 xor %%o0, %%l2, %%o0
+                 xor %%o1, %%l3, %%o1
+                 ldd [%3 + 0x10], %%l2
+                 xor %%o2, %%l4, %%o2
+                 xor %%o3, %%l5, %%o3
+                 ldd [%3 + 0x18], %%l4
+                 xor %%g2, %%o4, %%g2
+                 xor %%g3, %%o5, %%g3
+                 ldd [%4 + 0x00], %%o4
+                 xor %%g4, %%l0, %%g4
+                 xor %%g5, %%l1, %%g5
+                 ldd [%4 + 0x08], %%l0
+                 xor %%o0, %%l2, %%o0
+                 xor %%o1, %%l3, %%o1
+                 ldd [%4 + 0x10], %%l2
+                 xor %%o2, %%l4, %%o2
+                 xor %%o3, %%l5, %%o3
+                 ldd [%4 + 0x18], %%l4
+                 xor %%g2, %%o4, %%g2
+                 xor %%g3, %%o5, %%g3
+                 xor %%g4, %%l0, %%g4
+                 xor %%g5, %%l1, %%g5
+                 xor %%o0, %%l2, %%o0
+                 xor %%o1, %%l3, %%o1
+                 xor %%o2, %%l4, %%o2
+                 xor %%o3, %%l5, %%o3
+                 std %%g2, [%0 + 0x00]
+                 std %%g4, [%0 + 0x08]
+                 std %%o0, [%0 + 0x10]
+                 std %%o2, [%0 + 0x18]
+                 " : : "r" (destp), "r" (source1), "r" (source2), "r" (source3), "r" (source4)
+                 : "g2", "g3", "g4", "g5", "o0", "o1", "o2", "o3", "o4", "o5",
+                 "l0", "l1", "l2", "l3", "l4", "l5");
+                 destp += 8;
+                 source1 += 8;
+                 source2 += 8;
+                 source3 += 8;
+                 source4 += 8;
+               }
+               break;
+       }
+}
+#endif /* __sparc_v[78]__ */
+
+#ifndef __sparc_v9__
+
+/*
+ * this one works reasonably on any x86 CPU
+ * (send me an assembly version for inclusion if you can make it faster)
+ *
+ * this one is just as fast as written in pure assembly on x86.
+ * the reason for this separate version is that the
+ * fast open-coded xor routine "32reg" produces suboptimal code
+ * on x86, due to lack of registers.
+ */
+XORBLOCK_TEMPLATE(8regs)
+{
+       int len  = bh_ptr[0]->b_size;
+       long *destp   = (long *) bh_ptr[0]->b_data;
+       long *source1, *source2, *source3, *source4;
+       long lines = len / (sizeof (long)) / 8, i;
+
+       switch(count) {
+               case 2:
+                       source1 = (long *) bh_ptr[1]->b_data;
+                       for (i = lines; i > 0; i--) {
+                               *(destp + 0) ^= *(source1 + 0);
+                               *(destp + 1) ^= *(source1 + 1);
+                               *(destp + 2) ^= *(source1 + 2);
+                               *(destp + 3) ^= *(source1 + 3);
+                               *(destp + 4) ^= *(source1 + 4);
+                               *(destp + 5) ^= *(source1 + 5);
+                               *(destp + 6) ^= *(source1 + 6);
+                               *(destp + 7) ^= *(source1 + 7);
+                               source1 += 8;
+                               destp += 8;
+                       }
+                       break;
+               case 3:
+                       source2 = (long *) bh_ptr[2]->b_data;
+                       source1 = (long *) bh_ptr[1]->b_data;
+                       for (i = lines; i > 0; i--) {
+                               *(destp + 0) ^= *(source1 + 0);
+                               *(destp + 0) ^= *(source2 + 0);
+                               *(destp + 1) ^= *(source1 + 1);
+                               *(destp + 1) ^= *(source2 + 1);
+                               *(destp + 2) ^= *(source1 + 2);
+                               *(destp + 2) ^= *(source2 + 2);
+                               *(destp + 3) ^= *(source1 + 3);
+                               *(destp + 3) ^= *(source2 + 3);
+                               *(destp + 4) ^= *(source1 + 4);
+                               *(destp + 4) ^= *(source2 + 4);
+                               *(destp + 5) ^= *(source1 + 5);
+                               *(destp + 5) ^= *(source2 + 5);
+                               *(destp + 6) ^= *(source1 + 6);
+                               *(destp + 6) ^= *(source2 + 6);
+                               *(destp + 7) ^= *(source1 + 7);
+                               *(destp + 7) ^= *(source2 + 7);
+                               source1 += 8;
+                               source2 += 8;
+                               destp += 8;
+                       }
+                       break;
+               case 4:
+                       source3 = (long *) bh_ptr[3]->b_data;
+                       source2 = (long *) bh_ptr[2]->b_data;
+                       source1 = (long *) bh_ptr[1]->b_data;
+                       for (i = lines; i > 0; i--) {
+                               *(destp + 0) ^= *(source1 + 0);
+                               *(destp + 0) ^= *(source2 + 0);
+                               *(destp + 0) ^= *(source3 + 0);
+                               *(destp + 1) ^= *(source1 + 1);
+                               *(destp + 1) ^= *(source2 + 1);
+                               *(destp + 1) ^= *(source3 + 1);
+                               *(destp + 2) ^= *(source1 + 2);
+                               *(destp + 2) ^= *(source2 + 2);
+                               *(destp + 2) ^= *(source3 + 2);
+                               *(destp + 3) ^= *(source1 + 3);
+                               *(destp + 3) ^= *(source2 + 3);
+                               *(destp + 3) ^= *(source3 + 3);
+                               *(destp + 4) ^= *(source1 + 4);
+                               *(destp + 4) ^= *(source2 + 4);
+                               *(destp + 4) ^= *(source3 + 4);
+                               *(destp + 5) ^= *(source1 + 5);
+                               *(destp + 5) ^= *(source2 + 5);
+                               *(destp + 5) ^= *(source3 + 5);
+                               *(destp + 6) ^= *(source1 + 6);
+                               *(destp + 6) ^= *(source2 + 6);
+                               *(destp + 6) ^= *(source3 + 6);
+                               *(destp + 7) ^= *(source1 + 7);
+                               *(destp + 7) ^= *(source2 + 7);
+                               *(destp + 7) ^= *(source3 + 7);
+                               source1 += 8;
+                               source2 += 8;
+                               source3 += 8;
+                               destp += 8;
+                       }
+                       break;
+               case 5:
+                       source4 = (long *) bh_ptr[4]->b_data;
+                       source3 = (long *) bh_ptr[3]->b_data;
+                       source2 = (long *) bh_ptr[2]->b_data;
+                       source1 = (long *) bh_ptr[1]->b_data;
+                       for (i = lines; i > 0; i--) {
+                               *(destp + 0) ^= *(source1 + 0);
+                               *(destp + 0) ^= *(source2 + 0);
+                               *(destp + 0) ^= *(source3 + 0);
+                               *(destp + 0) ^= *(source4 + 0);
+                               *(destp + 1) ^= *(source1 + 1);
+                               *(destp + 1) ^= *(source2 + 1);
+                               *(destp + 1) ^= *(source3 + 1);
+                               *(destp + 1) ^= *(source4 + 1);
+                               *(destp + 2) ^= *(source1 + 2);
+                               *(destp + 2) ^= *(source2 + 2);
+                               *(destp + 2) ^= *(source3 + 2);
+                               *(destp + 2) ^= *(source4 + 2);
+                               *(destp + 3) ^= *(source1 + 3);
+                               *(destp + 3) ^= *(source2 + 3);
+                               *(destp + 3) ^= *(source3 + 3);
+                               *(destp + 3) ^= *(source4 + 3);
+                               *(destp + 4) ^= *(source1 + 4);
+                               *(destp + 4) ^= *(source2 + 4);
+                               *(destp + 4) ^= *(source3 + 4);
+                               *(destp + 4) ^= *(source4 + 4);
+                               *(destp + 5) ^= *(source1 + 5);
+                               *(destp + 5) ^= *(source2 + 5);
+                               *(destp + 5) ^= *(source3 + 5);
+                               *(destp + 5) ^= *(source4 + 5);
+                               *(destp + 6) ^= *(source1 + 6);
+                               *(destp + 6) ^= *(source2 + 6);
+                               *(destp + 6) ^= *(source3 + 6);
+                               *(destp + 6) ^= *(source4 + 6);
+                               *(destp + 7) ^= *(source1 + 7);
+                               *(destp + 7) ^= *(source2 + 7);
+                               *(destp + 7) ^= *(source3 + 7);
+                               *(destp + 7) ^= *(source4 + 7);
+                               source1 += 8;
+                               source2 += 8;
+                               source3 += 8;
+                               source4 += 8;
+                               destp += 8;
+                       }
+                       break;
+       }
+}
+
+/*
+ * platform independent RAID5 checksum calculation, this should
+ * be very fast on any platform that has a decent amount of
+ * registers. (32 or more)
+ */
+XORBLOCK_TEMPLATE(32regs)
+{
+       int size  = bh_ptr[0]->b_size;
+       int lines = size / (sizeof (long)) / 8, i;
+       long *destp   = (long *) bh_ptr[0]->b_data;
+       long *source1, *source2, *source3, *source4;
+       
+         /* LOTS of registers available...
+            We do explicite loop-unrolling here for code which
+            favours RISC machines.  In fact this is almoast direct
+            RISC assembly on Alpha and SPARC :-)  */
+
+
+       switch(count) {
+               case 2:
+                       source1 = (long *) bh_ptr[1]->b_data;
+                       for (i = lines; i > 0; i--) {
+                               register long d0, d1, d2, d3, d4, d5, d6, d7;
+                               d0 = destp[0];  /* Pull the stuff into registers        */
+                               d1 = destp[1];  /*  ... in bursts, if possible.         */
+                               d2 = destp[2];
+                               d3 = destp[3];
+                               d4 = destp[4];
+                               d5 = destp[5];
+                               d6 = destp[6];
+                               d7 = destp[7];
+                               d0 ^= source1[0];
+                               d1 ^= source1[1];
+                               d2 ^= source1[2];
+                               d3 ^= source1[3];
+                               d4 ^= source1[4];
+                               d5 ^= source1[5];
+                               d6 ^= source1[6];
+                               d7 ^= source1[7];
+                               destp[0] = d0;  /* Store the result (in burts)          */
+                               destp[1] = d1;
+                               destp[2] = d2;
+                               destp[3] = d3;
+                               destp[4] = d4;  /* Store the result (in burts)          */
+                               destp[5] = d5;
+                               destp[6] = d6;
+                               destp[7] = d7;
+                               source1 += 8;
+                               destp += 8;
+                       }
+                       break;
+               case 3:
+                       source2 = (long *) bh_ptr[2]->b_data;
+                       source1 = (long *) bh_ptr[1]->b_data;
+                       for (i = lines; i > 0; i--) {
+                               register long d0, d1, d2, d3, d4, d5, d6, d7;
+                               d0 = destp[0];  /* Pull the stuff into registers        */
+                               d1 = destp[1];  /*  ... in bursts, if possible.         */
+                               d2 = destp[2];
+                               d3 = destp[3];
+                               d4 = destp[4];
+                               d5 = destp[5];
+                               d6 = destp[6];
+                               d7 = destp[7];
+                               d0 ^= source1[0];
+                               d1 ^= source1[1];
+                               d2 ^= source1[2];
+                               d3 ^= source1[3];
+                               d4 ^= source1[4];
+                               d5 ^= source1[5];
+                               d6 ^= source1[6];
+                               d7 ^= source1[7];
+                               d0 ^= source2[0];
+                               d1 ^= source2[1];
+                               d2 ^= source2[2];
+                               d3 ^= source2[3];
+                               d4 ^= source2[4];
+                               d5 ^= source2[5];
+                               d6 ^= source2[6];
+                               d7 ^= source2[7];
+                               destp[0] = d0;  /* Store the result (in burts)          */
+                               destp[1] = d1;
+                               destp[2] = d2;
+                               destp[3] = d3;
+                               destp[4] = d4;  /* Store the result (in burts)          */
+                               destp[5] = d5;
+                               destp[6] = d6;
+                               destp[7] = d7;
+                               source1 += 8;
+                               source2 += 8;
+                               destp += 8;
+                       }
+                       break;
+               case 4:
+                       source3 = (long *) bh_ptr[3]->b_data;
+                       source2 = (long *) bh_ptr[2]->b_data;
+                       source1 = (long *) bh_ptr[1]->b_data;
+                       for (i = lines; i > 0; i--) {
+                               register long d0, d1, d2, d3, d4, d5, d6, d7;
+                               d0 = destp[0];  /* Pull the stuff into registers        */
+                               d1 = destp[1];  /*  ... in bursts, if possible.         */
+                               d2 = destp[2];
+                               d3 = destp[3];
+                               d4 = destp[4];
+                               d5 = destp[5];
+                               d6 = destp[6];
+                               d7 = destp[7];
+                               d0 ^= source1[0];
+                               d1 ^= source1[1];
+                               d2 ^= source1[2];
+                               d3 ^= source1[3];
+                               d4 ^= source1[4];
+                               d5 ^= source1[5];
+                               d6 ^= source1[6];
+                               d7 ^= source1[7];
+                               d0 ^= source2[0];
+                               d1 ^= source2[1];
+                               d2 ^= source2[2];
+                               d3 ^= source2[3];
+                               d4 ^= source2[4];
+                               d5 ^= source2[5];
+                               d6 ^= source2[6];
+                               d7 ^= source2[7];
+                               d0 ^= source3[0];
+                               d1 ^= source3[1];
+                               d2 ^= source3[2];
+                               d3 ^= source3[3];
+                               d4 ^= source3[4];
+                               d5 ^= source3[5];
+                               d6 ^= source3[6];
+                               d7 ^= source3[7];
+                               destp[0] = d0;  /* Store the result (in burts)          */
+                               destp[1] = d1;
+                               destp[2] = d2;
+                               destp[3] = d3;
+                               destp[4] = d4;  /* Store the result (in burts)          */
+                               destp[5] = d5;
+                               destp[6] = d6;
+                               destp[7] = d7;
+                               source1 += 8;
+                               source2 += 8;
+                               source3 += 8;
+                               destp += 8;
+                       }
+                       break;
+               case 5:
+                       source4 = (long *) bh_ptr[4]->b_data;
+                       source3 = (long *) bh_ptr[3]->b_data;
+                       source2 = (long *) bh_ptr[2]->b_data;
+                       source1 = (long *) bh_ptr[1]->b_data;
+                       for (i = lines; i > 0; i--) {
+                               register long d0, d1, d2, d3, d4, d5, d6, d7;
+                               d0 = destp[0];  /* Pull the stuff into registers        */
+                               d1 = destp[1];  /*  ... in bursts, if possible.         */
+                               d2 = destp[2];
+                               d3 = destp[3];
+                               d4 = destp[4];
+                               d5 = destp[5];
+                               d6 = destp[6];
+                               d7 = destp[7];
+                               d0 ^= source1[0];
+                               d1 ^= source1[1];
+                               d2 ^= source1[2];
+                               d3 ^= source1[3];
+                               d4 ^= source1[4];
+                               d5 ^= source1[5];
+                               d6 ^= source1[6];
+                               d7 ^= source1[7];
+                               d0 ^= source2[0];
+                               d1 ^= source2[1];
+                               d2 ^= source2[2];
+                               d3 ^= source2[3];
+                               d4 ^= source2[4];
+                               d5 ^= source2[5];
+                               d6 ^= source2[6];
+                               d7 ^= source2[7];
+                               d0 ^= source3[0];
+                               d1 ^= source3[1];
+                               d2 ^= source3[2];
+                               d3 ^= source3[3];
+                               d4 ^= source3[4];
+                               d5 ^= source3[5];
+                               d6 ^= source3[6];
+                               d7 ^= source3[7];
+                               d0 ^= source4[0];
+                               d1 ^= source4[1];
+                               d2 ^= source4[2];
+                               d3 ^= source4[3];
+                               d4 ^= source4[4];
+                               d5 ^= source4[5];
+                               d6 ^= source4[6];
+                               d7 ^= source4[7];
+                               destp[0] = d0;  /* Store the result (in burts)          */
+                               destp[1] = d1;
+                               destp[2] = d2;
+                               destp[3] = d3;
+                               destp[4] = d4;  /* Store the result (in burts)          */
+                               destp[5] = d5;
+                               destp[6] = d6;
+                               destp[7] = d7;
+                               source1 += 8;
+                               source2 += 8;
+                               source3 += 8;
+                               source4 += 8;
+                               destp += 8;
+                       }
+                       break;
+       }
+}
+
+/*
+ * (the -6*32 shift factor colors the cache)
+ */
+#define SIZE (PAGE_SIZE-6*32)
+
+static void xor_speed ( struct xor_block_template * func, 
+       struct buffer_head *b1, struct buffer_head *b2)
+{
+       int speed;
+       unsigned long now;
+       int i, count, max;
+       struct buffer_head *bh_ptr[6];
+
+       func->next = xor_functions;
+       xor_functions = func;
+       bh_ptr[0] = b1;
+       bh_ptr[1] = b2;
+
+       /*
+        * count the number of XORs done during a whole jiffy.
+        * calculate the speed of checksumming from this.
+        * (we use a 2-page allocation to have guaranteed
+        * color L1-cache layout)
+        */
+       max = 0;
+       for (i = 0; i < 5; i++) {
+               now = jiffies;
+               count = 0;
+               while (jiffies == now) {
+                       mb();
+                       func->xor_block(2,bh_ptr);
+                       mb();
+                       count++;
+                       mb();
+               }
+               if (count > max)
+                       max = count;
+       }
+
+       speed = max * (HZ*SIZE/1024);
+       func->speed = speed;
+
+       printk( "   %-10s: %5d.%03d MB/sec\n", func->name,
+               speed / 1000, speed % 1000);
+}
+
+static inline void pick_fastest_function(void)
+{
+       struct xor_block_template *f, *fastest;
+
+       fastest = xor_functions;
+       for (f = fastest; f; f = f->next) {
+               if (f->speed > fastest->speed)
+                       fastest = f;
+       }
+#ifdef CONFIG_X86_XMM 
+       if (boot_cpu_data.mmu_cr4_features & X86_CR4_OSXMMEXCPT) {
+               fastest = &t_xor_block_pIII_kni;
+       }
+#endif
+       xor_block = fastest->xor_block;
+       printk( "using fastest function: %s (%d.%03d MB/sec)\n", fastest->name,
+               fastest->speed / 1000, fastest->speed % 1000);
+}
+ 
+
+void calibrate_xor_block(void)
+{
+       struct buffer_head b1, b2;
+
+       memset(&b1,0,sizeof(b1));
+       b2 = b1;
+
+       b1.b_data = (char *) md__get_free_pages(GFP_KERNEL,2);
+       if (!b1.b_data) {
+               pick_fastest_function();
+               return;
+       }
+       b2.b_data = b1.b_data + 2*PAGE_SIZE + SIZE;
+
+       b1.b_size = SIZE;
+
+       printk(KERN_INFO "raid5: measuring checksumming speed\n");
+
+       sti(); /* should be safe */
+
+#if defined(__sparc__) && !defined(__sparc_v9__)
+       printk(KERN_INFO "raid5: trying high-speed SPARC checksum routine\n");
+       xor_speed(&t_xor_block_SPARC,&b1,&b2);
+#endif
+
+#ifdef CONFIG_X86_XMM 
+       if (boot_cpu_data.mmu_cr4_features & X86_CR4_OSXMMEXCPT) {
+               printk(KERN_INFO
+                       "raid5: KNI detected, trying cache-avoiding KNI checksum routine\n");
+               /* we force the use of the KNI xor block because it
+                       can write around l2.  we may also be able
+                       to load into the l1 only depending on how
+                       the cpu deals with a load to a line that is
+                       being prefetched.
+               */
+               xor_speed(&t_xor_block_pIII_kni,&b1,&b2);
+       }
+#endif /* CONFIG_X86_XMM */
+
+#ifdef __i386__
+
+       if (md_cpu_has_mmx()) {
+               printk(KERN_INFO
+                       "raid5: MMX detected, trying high-speed MMX checksum routines\n");
+               xor_speed(&t_xor_block_pII_mmx,&b1,&b2);
+               xor_speed(&t_xor_block_p5_mmx,&b1,&b2);
+       }
+
+#endif /* __i386__ */
+       
+       
+       xor_speed(&t_xor_block_8regs,&b1,&b2);
+       xor_speed(&t_xor_block_32regs,&b1,&b2);
+
+       free_pages((unsigned long)b1.b_data,2);
+       pick_fastest_function();
+}
+
+#else /* __sparc_v9__ */
+
+void calibrate_xor_block(void)
+{
+       printk(KERN_INFO "raid5: using high-speed VIS checksum routine\n");
+       xor_block = xor_block_VIS;
+}
+
+#endif /* __sparc_v9__ */
+
+MD_EXPORT_SYMBOL(xor_block);
+
--- linux/arch/i386/defconfig.orig      Mon Dec 11 01:49:41 2000
+++ linux/arch/i386/defconfig   Tue Jan 16 13:42:04 2001
@@ -93,7 +93,15 @@
 #
 # CONFIG_BLK_DEV_LOOP is not set
 # CONFIG_BLK_DEV_NBD is not set
-# CONFIG_BLK_DEV_MD is not set
+CONFIG_BLK_DEV_MD=y
+CONFIG_AUTODETECT_RAID=y
+CONFIG_MD_TRANSLUCENT=y
+CONFIG_MD_LINEAR=y
+CONFIG_MD_STRIPED=y
+CONFIG_MD_MIRRORING=y
+CONFIG_MD_RAID5=y
+CONFIG_MD_BOOT=y
+CONFIG_BLK_DEV_HSM=y
 # CONFIG_BLK_DEV_RAM is not set
 # CONFIG_BLK_DEV_XD is not set
 # CONFIG_BLK_DEV_DAC960 is not set
--- linux/arch/sparc/config.in.orig     Mon Dec 11 01:49:41 2000
+++ linux/arch/sparc/config.in  Tue Jan 16 13:42:04 2001
@@ -88,10 +88,16 @@
 
 bool 'Multiple devices driver support' CONFIG_BLK_DEV_MD
 if [ "$CONFIG_BLK_DEV_MD" = "y" ]; then
+  bool 'Autodetect RAID partitions' CONFIG_AUTODETECT_RAID
   tristate '   Linear (append) mode' CONFIG_MD_LINEAR
   tristate '   RAID-0 (striping) mode' CONFIG_MD_STRIPED
   tristate '   RAID-1 (mirroring) mode' CONFIG_MD_MIRRORING
   tristate '   RAID-4/RAID-5 mode' CONFIG_MD_RAID5
+  tristate '   Translucent mode' CONFIG_MD_TRANSLUCENT
+  tristate '   Hierarchical Storage Management support' CONFIG_MD_HSM
+fi
+if [ "$CONFIG_MD_LINEAR" = "y" -o "$CONFIG_MD_STRIPED" = "y" ]; then
+  bool '      Boot support (linear, striped)' CONFIG_MD_BOOT
 fi
 
 tristate 'RAM disk support' CONFIG_BLK_DEV_RAM
--- linux/arch/sparc/defconfig.orig     Tue Jan 16 13:30:06 2001
+++ linux/arch/sparc/defconfig  Tue Jan 16 13:42:04 2001
@@ -89,10 +89,13 @@
 #
 CONFIG_BLK_DEV_FD=y
 CONFIG_BLK_DEV_MD=y
+# CONFIG_AUTODETECT_RAID is not set
 CONFIG_MD_LINEAR=m
 CONFIG_MD_STRIPED=m
 CONFIG_MD_MIRRORING=m
 CONFIG_MD_RAID5=m
+# CONFIG_MD_TRANSLUCENT is not set
+# CONFIG_MD_HSM is not set
 CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_SIZE=4096
 CONFIG_BLK_DEV_INITRD=y
--- linux/arch/sparc64/config.in.orig   Mon Dec 11 01:49:41 2000
+++ linux/arch/sparc64/config.in        Tue Jan 16 13:42:04 2001
@@ -102,10 +102,16 @@
 
 bool 'Multiple devices driver support' CONFIG_BLK_DEV_MD
 if [ "$CONFIG_BLK_DEV_MD" = "y" ]; then
+  bool 'Autodetect RAID partitions' CONFIG_AUTODETECT_RAID
   tristate '   Linear (append) mode' CONFIG_MD_LINEAR
   tristate '   RAID-0 (striping) mode' CONFIG_MD_STRIPED
   tristate '   RAID-1 (mirroring) mode' CONFIG_MD_MIRRORING
   tristate '   RAID-4/RAID-5 mode' CONFIG_MD_RAID5
+  tristate '   Translucent mode' CONFIG_MD_TRANSLUCENT
+  tristate '   Hierarchical Storage Management support' CONFIG_MD_HSM
+fi
+if [ "$CONFIG_MD_LINEAR" = "y" -o "$CONFIG_MD_STRIPED" = "y" ]; then
+  bool '      Boot support (linear, striped)' CONFIG_MD_BOOT
 fi
 
 tristate 'RAM disk support' CONFIG_BLK_DEV_RAM
--- linux/arch/sparc64/defconfig.orig   Tue Jan 16 13:30:06 2001
+++ linux/arch/sparc64/defconfig        Tue Jan 16 13:42:04 2001
@@ -106,10 +106,13 @@
 #
 CONFIG_BLK_DEV_FD=y
 CONFIG_BLK_DEV_MD=y
+# CONFIG_AUTODETECT_RAID is not set
 CONFIG_MD_LINEAR=m
 CONFIG_MD_STRIPED=m
 CONFIG_MD_MIRRORING=m
 CONFIG_MD_RAID5=m
+# CONFIG_MD_TRANSLUCENT is not set
+# CONFIG_MD_HSM is not set
 CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_SIZE=4096
 CONFIG_BLK_DEV_INITRD=y
--- linux/Documentation/Configure.help.orig     Tue Jan 16 13:30:06 2001
+++ linux/Documentation/Configure.help  Tue Jan 16 13:42:04 2001
@@ -1015,6 +1015,13 @@
 
   If unsure, say N.
 
+Autodetect RAID partitions
+CONFIG_AUTODETECT_RAID
+  This feature lets the kernel detect RAID partitions on bootup.
+  An autodetect RAID partition is a normal partition with partition
+  type 0xfd. Use this if you want to boot RAID devices, or want to
+  run them automatically.
+
 Linear (append) mode
 CONFIG_MD_LINEAR
   If you say Y here, then your multiple devices driver will be able to
@@ -1093,6 +1100,21 @@
   Documentation/modules.txt.
 
   If unsure, say Y.
+
+Translucent Block Device Support (EXPERIMENTAL)
+CONFIG_MD_TRANSLUCENT
+  DO NOT USE THIS STUFF YET!
+
+  currently there is only a placeholder there as the implementation
+  is not yet usable.
+
+Hierarchical Storage Management support (EXPERIMENTAL)
+CONFIG_MD_HSM
+  DO NOT USE THIS STUFF YET!
+
+  i have released this so people can comment on the architecture,
+  but user-space tools are still unusable so there is nothing much
+  you can do with this.
 
 Boot support (linear, striped)
 CONFIG_MD_BOOT