mod-bcache.sh

   1 #!/bin/sh
   2 # geninitrd mod: bcache
   3 # requires 3.10 kernel
   4 # http://bcache.evilpiepirate.org/
   5 USE_BCACHE=${USE_BCACHE:-yes}
   6
   7 # setup geninitrd module
   8 # @access   public
   9 setup_mod_bcache() {
  10         if [ ! -d /sys/fs/bcache ]; then
  11                 USE_BCACHE=no
  12         fi
  13
  14         if [ ! -x /lib/udev/bcache-register ]; then
  15                 USE_BCACHE=no
  16         fi
  17 }
  18
  19 # find modules for $devpath
  20 # @param        $devpath        device to be examined
  21 # @access       public
  22 find_modules_bcache() {
  23         if ! is_yes "$USE_BCACHE"; then
  24                 return
  25         fi
  26
  27         local devpath="$1"
  28         local dev=${devpath#/dev/}
  29         local slavedir=/sys/block/$dev/slaves
  30
  31         if [ ! -d $slavedir ]; then
  32                 die "Cannot inspect $slavedir for $devpath"
  33         fi
  34
  35         for dev in $slavedir/*; do
  36                 dev=${dev#$slavedir/}
  37                 find_modules_for_devpath /dev/$dev
  38         done
  39
  40         find_module "bcache"
  41 }
  42
  43 # generate initrd fragment
  44 # @access   public
  45 initrd_gen_bcache() {
  46         if ! is_yes "$USE_BCACHE"; then
  47                 return
  48         fi
  49
  50         verbose "Adding bcache support to initrd"
  51
  52         inst_rules 69-bcache.rules
  53         inst_exec /lib/udev/bcache-register /lib/udev
  54 }