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Subject[git pull] device mapper changes for 3.19
Hi Linus,

The following changes since commit 9b460d3699324d570a4d4161c3741431887f102f:

dm btree: fix a recursion depth bug in btree walking code (2014-11-10 15:23:58 -0500)

are available in the git repository at:

git:// tags/dm-3.19-changes

for you to fetch changes up to 1a71d6ffe18c0d0f03fc8531949cc8ed41d702ee:

dm crypt: use memzero_explicit for on-stack buffer (2014-12-02 10:25:07 -0500)

Please pull, thanks.

- Significant DM thin-provisioning performance improvements to meet
performance requirements that were requested by the Gluster
distributed filesystem. Specifically, dm-thinp now takes care to
aggregate IO that will be issued to the same thinp block before
issuing IO to the underlying devices. This really helps improve
performance on HW RAID6 devices that have a writeback cache because it
avoids RMW in the HW RAID controller.

- Some stable fixes: fix leak in DM bufio if integrity profiles were
enabled, use memzero_explicit in DM crypt to avoid any potential for
information leak, and a DM cache fix to properly mark a cache block
dirty if it was promoted to the cache via the overwrite optimization.

- A few simple DM persistent data library fixes

- DM cache multiqueue policy block promotion improvements.

- DM cache discard improvements that take advantage of range
(multiblock) discard support in the DM bio-prison. This allows for
much more efficient bulk discard processing (e.g. when mkfs.xfs
discards the entire device).

- Some small optimizations in DM core and RCU deference cleanups

- DM core changes to suspend/resume code to introduce the new internal
suspend/resume interface that the DM thin-pool target now uses to
suspend/resume active thin devices when the thin-pool must
suspend/resume. This avoids forcing userspace to track all active
thin volumes in a thin-pool when the thin-pool is suspended for the
purposes of metadata or data space resize.

Dan Carpenter (1):
dm space map metadata: fix sm_bootstrap_get_nr_blocks()

Darrick J. Wong (1):
dm bufio: fix memleak when using a dm_buffer's inline bio

Eric Dumazet (1):
dm: use rcu_dereference_protected instead of rcu_dereference

Hannes Reinecke (1):
dm: do not call dm_sync_table() when creating new devices

Joe Thornber (27):
dm bufio: switch from a huge hash table to an rbtree
dm bufio: evict buffers that are past the max age but retain some buffers
dm bio prison: switch to using a red black tree
dm thin metadata: change dm_thin_find_block to allow blocking, but not issuing, IO
dm transaction manager: add support for prefetching blocks of metadata
dm thin: prefetch missing metadata pages
dm thin: throttle incoming IO
dm thin: performance improvement to discard processing
dm thin: defer whole cells rather than individual bios
dm thin: remap the bios in a cell immediately
dm thin: direct dispatch when breaking sharing
dm thin: sort the deferred cells
dm cache policy mq: tweak algorithm that decides when to promote a block
dm bio prison: introduce support for locking ranges of blocks
dm cache: revert "remove remainder of distinct discard block size"
dm cache: revert "prevent corruption caused by discard_block_size > cache_block_size"
dm cache: improve discard support
dm cache: emit a warning message if there are a lot of cache blocks
dm array: if resizing the array is a noop set the new root to the old one
dm cache: fix some issues with the new discard range support
dm cache: when reloading a discard bitset allow for a different discard block size
dm cache: fix a harmless race when working out if a block is discarded
dm cache: discard block size must be a multiple of cache block size
dm cache: only use overwrite optimisation for promotion when in writeback mode
dm cache: dirty flag was mistakenly being cleared when promoting via overwrite
dm cache: fix spurious cell_defer when dealing with partial block at end of device
dm space map metadata: fix sm_bootstrap_get_count()

Mike Snitzer (14):
dm thin: adjust max_sectors_kb based on thinp blocksize
dm: improve documentation and code clarity in dm_merge_bvec
dm thin: implement thin_merge
dm thin: factor out remap_and_issue_overwrite
dm thin: optimize retry_bios_on_resume
dm thin: refactor requeue_io to eliminate spinlock bouncing
dm cache policy mq: simplify ability to promote sequential IO to the cache
dm thin: remove stale 'trim' message in block comment above pool_message
dm: return earlier from dm_blk_ioctl if target doesn't implement .ioctl
dm: add presuspend_undo hook to target_type
dm thin: do not allow thin device activation while pool is suspended
dm: enhance internal suspend and resume interface
dm thin: suspend/resume active thin devices when reloading thin-pool
dm thin: fix pool_io_hints to avoid looking at max_hw_sectors

Mikulas Patocka (1):
dm thin: fix a race in thin_dtr

Milan Broz (1):
dm crypt: use memzero_explicit for on-stack buffer

Pranith Kumar (2):
dm: Use rcu_dereference() for accessing rcu pointer
dm: sparse: Annotate field with __rcu for checking

Documentation/device-mapper/cache-policies.txt | 24 +-
drivers/md/dm-bio-prison.c | 186 +++--
drivers/md/dm-bio-prison.h | 28 +-
drivers/md/dm-bufio.c | 226 +++---
drivers/md/dm-cache-block-types.h | 11 +
drivers/md/dm-cache-metadata.c | 34 +-
drivers/md/dm-cache-metadata.h | 6 +-
drivers/md/dm-cache-policy-mq.c | 82 ++-
drivers/md/dm-cache-target.c | 378 +++++++---
drivers/md/dm-crypt.c | 2 +-
drivers/md/dm-ioctl.c | 5 +-
drivers/md/dm-stats.c | 2 +-
drivers/md/dm-table.c | 36 +-
drivers/md/dm-thin-metadata.c | 35 +-
drivers/md/dm-thin-metadata.h | 9 +-
drivers/md/dm-thin.c | 760 ++++++++++++++++-----
drivers/md/dm.c | 273 ++++++--
drivers/md/dm.h | 10 +
drivers/md/persistent-data/dm-array.c | 4 +-
drivers/md/persistent-data/dm-space-map-metadata.c | 8 +-
.../md/persistent-data/dm-transaction-manager.c | 77 ++-
.../md/persistent-data/dm-transaction-manager.h | 7 +
include/linux/device-mapper.h | 2 +
include/uapi/linux/dm-ioctl.h | 9 +-
24 files changed, 1634 insertions(+), 580 deletions(-)

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