Merge tag 'dm-4.2-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device...

Pull device mapper fixes from Mike Snitzer:

 - fix DM thinp to consistently return -ENOSPC when out of data space

 - fix a logic bug in the DM cache smq policy's creation error path

 - revert a DM cache 4.2-rc3 change that reduced writeback efficiency

 - fix a hang on DM cache device destruction due to improper
   prealloc_used accounting introduced in 4.2-rc3

 - update URL for dm-crypt wiki page

* tag 'dm-4.2-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm cache: fix device destroy hang due to improper prealloc_used accounting
  Revert "dm cache: do not wake_worker() in free_migration()"
  dm crypt: update wiki page URL
  dm cache policy smq: fix alloc_bitset check that always evaluates as false
  dm thin: return -ENOSPC when erroring retry list due to out of data space