Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm
* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm:
dm crypt: add merge
dm table: remove merge_bvec sector restriction
dm: linear add merge
dm: introduce merge_bvec_fn
dm snapshot: use per device mempools
dm snapshot: fix race during exception creation
dm snapshot: track snapshot reads
dm mpath: fix test for reinstate_path
dm mpath: return parameter error
dm io: remove struct padding
dm log: make dm_dirty_log init and exit static
dm mpath: free path selector on invalid args