Pull btrfs fixes from David Sterba:
 "There are still regressions being found and fixed in the zoned mode
  and subpage code, the rest are fixes for bugs reported by users.

  Regressions:

   - subpage block support:
      - readahead works on the proper block size
      - fix last page zeroing

   - zoned mode:
      - linked list corruption for tree log

  Fixes:

   - qgroup leak after falloc failure

   - tree mod log and backref resolving:
      - extent buffer cloning race when resolving backrefs
      - pin deleted leaves with active tree mod log users

   - drop debugging flag from slab cache"

* tag 'for-5.12-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: always pin deleted leaves when there are active tree mod log users
  btrfs: fix race when cloning extent buffer during rewind of an old root
  btrfs: fix slab cache flags for free space tree bitmap
  btrfs: subpage: make readahead work properly
  btrfs: subpage: fix wild pointer access during metadata read failure
  btrfs: zoned: fix linked list corruption after log root tree allocation failure
  btrfs: fix qgroup data rsv leak caused by falloc failure
  btrfs: track qgroup released data in own variable in insert_prealloc_file_extent
  btrfs: fix wrong offset to zero out range beyond i_size