[git pull] a few additional device mapper fixes for 3.19 final

[git pull] a few additional device mapper fixes for 3.19 final

[Mike Snitzer]

Hi Linus,

The following changes since commit 5164bece1673cdf04782f8ed3fba70743700f5da:

  dm: fix missed error code if .end_io isn't implemented by target_type (2014-12-17 12:31:13 -0500)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git tags/dm-3.19-fixes-2

for you to fetch changes up to 96b26c8c64c7a30488b8b404f7a63346df4c3bff:

  dm: fix handling of multiple internal suspends (2015-01-24 14:50:08 -0500)

Please pull, thanks.
Mike

----------------------------------------------------------------
2 stable fixes for dm-cache and 1 3.19 DM core fix:

- Fix potential for dm-cache metadata corruption via stale metadata
  buffers being used when switching an inactive cache table to active;
  this could occur due to each table having it's own bufio client rather
  than sharing the client between tables.

- Fix dm-cache target to properly account for discard IO while
  suspending otherwise IO quiescing could complete prematurely.

- Fix DM core's handling of multiple internal suspends by maintaining an
  'internal_suspend_count' and only resuming the device when this count
  drops to zero.

----------------------------------------------------------------
Joe Thornber (2):
      dm cache: share cache-metadata object across inactive and active DM tables
      dm cache: fix problematic dual use of a single migration count variable

Mikulas Patocka (1):
      dm: fix handling of multiple internal suspends

 drivers/md/dm-cache-metadata.c | 101 ++++++++++++++++++++++++++++++++++++++---
 drivers/md/dm-cache-target.c   |  89 ++++++++++++++++++++----------------
 drivers/md/dm.c                |   9 +++-
 3 files changed, 152 insertions(+), 47 deletions(-)