Merge branch 'md-7.2' of https://git.kernel.org/pub/scm/linux/kernel/git/mdraid/linux...

Pull MD fixes from Yu Kuai:

"Bug Fixes:
 - Fix raid1 writes_pending and barrier reference leaks on write
   failures. (Abd-Alrhman Masalkhi)
 - Fix raid10 writes_pending leak on write request failures.
   (Abd-Alrhman Masalkhi)
 - Fix raid10 writes_pending and barrier reference leaks on discard
   failures. (Abd-Alrhman Masalkhi)
 - Fix raid1 REQ_NOWAIT handling while waiting for behind writes.
   (Abd-Alrhman Masalkhi)
 - Fix raid1 r1_bio leak when a REQ_NOWAIT retry would block.
   (Abd-Alrhman Masalkhi)
 - Fix raid1 read-balance head_position data race. (Chen Cheng)
 - Fix raid5 stripe batch bm_seq wraparound comparison. (Chen Cheng)
 - Fix raid5 stripe batch state snapshot KCSAN noise. (Chen Cheng)
 - Fix raid5 R5_Overlap races while breaking stripe batches.
   (Chen Cheng)

 Improvements:
 - Add raid5 discard IO accounting. (Yu Kuai)
 - Always convert raid5 llbitmap bits for discard. (Yu Kuai)

 Cleanups:
 - Simplify raid1_write_request() error handling.
   (Abd-Alrhman Masalkhi)"

* 'md-7.2' of https://git.kernel.org/pub/scm/linux/kernel/git/mdraid/linux:
  md/raid5: avoid R5_Overlap races while breaking stripe batches
  md/raid5: use stripe state snapshot in break_stripe_batch_list()
  md/raid5: let stripe batch bm_seq comparison wrap-safe
  md/raid1: protect head_position for read balance
  md/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry
  md/raid1: honor REQ_NOWAIT when waiting for behind writes
  md/raid5: always convert llbitmap bits for discard
  md/raid5: validate discard support at request time
  md/raid5: account discard IO
  md/raid1: simplify raid1_write_request() error handling
  md/raid10: fix writes_pending and barrier reference leaks on discard failures
  md/raid10: fix writes_pending leak on write request failures
  md/raid1: fix writes_pending and barrier reference leaks on write failures