Merge tag 'for-4.21/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper updates from Mike Snitzer:

 - Eliminate a couple indirect calls from bio-based DM core.

 - Fix DM to allow reads that exceed readahead limits by setting
   io_pages in the backing_dev_info.

 - A couple code cleanups in request-based DM.

 - Fix various DM targets to check for device sector overflow if
   CONFIG_LBDAF is not set.

 - Use u64 instead of sector_t to store iv_offset in DM crypt; sector_t
   isn't large enough on 32bit when CONFIG_LBDAF is not set.

 - Performance fixes to DM's kcopyd and the snapshot target focused on
   limiting memory use and workqueue stalls.

 - Fix typos in the integrity and writecache targets.

 - Log which algorithm is used for dm-crypt's encryption and
   dm-integrity's hashing.

 - Fix false -EBUSY errors in DM raid target's handling of check/repair
   messages.

 - Fix DM flakey target's corrupt_bio_byte feature to reliably corrupt
   the Nth byte in a bio's payload.

* tag 'for-4.21/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm: do not allow readahead to limit IO size
  dm raid: fix false -EBUSY when handling check/repair message
  dm rq: cleanup leftover code from recently removed q->mq_ops branching
  dm verity: log the hash algorithm implementation
  dm crypt: log the encryption algorithm implementation
  dm integrity: fix spelling mistake in workqueue name
  dm flakey: Properly corrupt multi-page bios.
  dm: Check for device sector overflow if CONFIG_LBDAF is not set
  dm crypt: use u64 instead of sector_t to store iv_offset
  dm kcopyd: Fix bug causing workqueue stalls
  dm snapshot: Fix excessive memory usage and workqueue stalls
  dm bufio: update comment in dm-bufio.c
  dm writecache: fix typo in error msg for creating writecache_flush_thread
  dm: remove indirect calls from __send_changing_extent_only()
  dm mpath: only flush workqueue when needed
  dm rq: remove unused arguments from rq_completed()
  dm: avoid indirect call in __dm_make_request

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