[git pull] device mapper fixes for 3.12

[git pull] device mapper fixes for 3.12

[Mike Snitzer]

The following changes since commit 272b98c6455f00884f0350f775c5342358ebb73f:

  Linux 3.12-rc1 (2013-09-16 16:17:51 -0400)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git tags/dm-3.12-fixes

for you to fetch changes up to e8603136cb04ec2d0c9b4b5be7a071fc003cb399:

  dm: add reserved_bio_based_ios module parameter (2013-09-23 10:42:24 -0400)

Please pull, thanks.
Mike

----------------------------------------------------------------
A set of device-mapper fixes for 3.12.

A few fixes for dm-snapshot, a 32 bit fix for dm-stats, a couple error
handling fixes for dm-multipath.  A fix for the thin provisioning target
to not expose non-zero discard limits if discards are disabled.

Lastly, add two DM module parameters which allow users to tune the
emergency memory reserves that DM mainatins per device -- this helps fix
a long-standing issue for dm-multipath.  The conservative default
reserve for request-based dm-multipath devices (256) has proven
problematic for users with many multipathed SCSI devices but relatively
little memory.  To responsibly select a smaller value users should use
the new nr_bios tracepoint info (via commit 75afb352 "block: Add nr_bios
to block_rq_remap tracepoint") to determine the peak number of bios
their workloads create.

----------------------------------------------------------------
Jun'ichi Nomura (1):
      dm mpath: do not fail path on -ENOSPC

Mike Snitzer (5):
      dm mpath: disable WRITE SAME if it fails
      dm thin: do not expose non-zero discard limits if discards disabled
      dm: lower bio-based mempool reservation
      dm: add reserved_rq_based_ios module parameter
      dm: add reserved_bio_based_ios module parameter

Mikulas Patocka (3):
      dm stats: fix possible counter corruption on 32-bit systems
      dm snapshot: workaround for a false positive lockdep warning
      dm-snapshot: fix performance degradation due to small hash size

 drivers/md/dm-io.c              |  7 ++--
 drivers/md/dm-mpath.c           | 18 ++++++++---
 drivers/md/dm-snap-persistent.c |  2 +-
 drivers/md/dm-snap.c            |  5 ++-
 drivers/md/dm-stats.c           | 23 +++++++++----
 drivers/md/dm-thin.c            | 14 ++++++--
 drivers/md/dm.c                 | 71 ++++++++++++++++++++++++++++++++++++++---
 drivers/md/dm.h                 |  3 ++
 include/linux/device-mapper.h   |  3 +-
 9 files changed, 120 insertions(+), 26 deletions(-)