Merge tag 'dm-3.13-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper changes from Mike Snitzer:
 "A set of device-mapper changes for 3.13.

  Improve reliability of buffer allocations for dm messages with a small
  number of arguments, a couple path group initialization fixes for dm
  multipath, a fix for resizing a dm array, various fixes and
  optimizations for dm cache, a fix for device mapper's Kconfig menu
  indentation.

  Features added include:
   - dm crypt support for activating legacy CBC TrueCrypt containers
     (useful for forensics of these old TCRYPT containers)
   - reduced dm-cache memory requirements for each block in the cache
   - basic support for shrinking a dm-cache's cache (fast) device
   - most notably, dm-cache support for managing cache coherency when
     deploying dm-cache with sophisticated origin volumes (that support
     hardware snapshots and/or clustering): these changes come in the
     form of a new passthrough operation mode and a cache block
     invalidation interface"

* tag 'dm-3.13-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (32 commits)
  dm cache: resolve small nits and improve Documentation
  dm cache: add cache block invalidation support
  dm cache: add remove_cblock method to policy interface
  dm cache policy mq: reduce memory requirements
  dm cache metadata: check the metadata version when reading the superblock
  dm cache: add passthrough mode
  dm cache: cache shrinking support
  dm cache: promotion optimisation for writes
  dm cache: be much more aggressive about promoting writes to discarded blocks
  dm cache policy mq: implement writeback_work() and mq_{set,clear}_dirty()
  dm cache: optimize commit_if_needed
  dm space map disk: optimise sm_disk_dec_block
  MAINTAINERS: add reference to device-mapper's linux-dm.git tree
  dm: fix Kconfig menu indentation
  dm: allow remove to be deferred
  dm table: print error on preresume failure
  dm crypt: add TCW IV mode for old CBC TCRYPT containers
  dm crypt: properly handle extra key string in initialization
  dm cache: log error message if dm_kcopyd_copy() fails
  dm cache: use cell_defer() boolean argument consistently
  ...

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