1. 14 Dec, 2009 1 commit
    • NeilBrown's avatar
      md/bitmap: protect against bitmap removal while being updated. · aa5cbd10
      NeilBrown authored
      A write intent bitmap can be removed from an array while the
      array is active.
      When this happens, all IO is suspended and flushed before the
      bitmap is removed.
      However it is possible that bitmap_daemon_work is still running to
      clear old bits from the bitmap.  If it is, it can dereference the
      bitmap after it has been freed.
      
      So introduce a new mutex to protect bitmap_daemon_work and get it
      before destroying a bitmap.
      
      This is suitable for any current -stable kernel.
      Signed-off-by: default avatarNeilBrown <neilb@suse.de>
      Cc: stable@kernel.org
      aa5cbd10
  2. 12 Dec, 2009 39 commits