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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