Merge tag 'for-7.4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs updates from David Sterba:
 "User visible changes:

   - remove tweakable sysfs way to enable features, used only for
     extent-irefs which has been default since 3.12; the sysfs interface
     makes it complicated due to locking and context, unlike ioctl

   - change which backup superblock does mount option
     'rescue=usebackuproot' choose, skip the last one due to rotation,
     for more fine grained control add options selecting a specific
     backup superblock by index (usebackuproot_N)

  Notable fixes:

   - syslog message fixup of error state description, duplicate 'E'
     renamed to 'H' (emergency shutdown), added 'I 'when delayed iputs
     are blocked

   - use kvmalloc for b-tree buffer allocations, as we're using more
     contig ranges because of large folios, the allocations started to
     warn on fragmented memory

   - handle unknown commands for the /dev/btrfs-control ioctls

   - tune timing of transaction commit when the space is getting low

   - in raid56, skip verifications if data checksums are not available

  Performance improvements:

   - reflink speedup, reorder locking and flushing to optimize for more
     common cases where the reflinked ranges are accessed, avoid
     unnecessary contention

   - minor speedup in zstd decompression (+8MB/s)

   - reduced contention of inode extent map lock, improves e.g. when
     shrinker processes inodes without extent maps, measured time
     reduction 10-20%

  Core changes:

   - move allocation errors out of some contexts (new
     inode/dentry/rename) to avoid transaction aborts

   - allocate system new chunks earlier, e.g. when consumed by
     fallocate, and tune deleting unused block groups if the system
     space is low

   - tree checker: reject extents for special files

   - many qgroup fixes regarding enabling/disabling, other state changes
     and qgroup relation updates

   - error handling fixes

   - refactoring, cleanups:
      - page to folio cleanups
      - transaction state macros/enums simplification
      - parameter simplifications"

* tag 'for-7.4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (92 commits)
  btrfs: fix use-after-free on quota enable allocation failure
  btrfs: prevent use-after-free in btrfs_transaction::switch_commits
  btrfs: return -ENOTTY for unknown ioctls on the control device
  btrfs: defrag: fix check to see if next extent can be defragged too
  btrfs: defrag: fix key comparison with max defrag key in btrfs_defrag_leaves()
  btrfs: use READ_ONCE() to read the chunk size from the data space_info
  btrfs: qgroup: make btrfs_record_squota_delta() return void
  btrfs: fix lost error return value in btrfs_alloc_logged_file_extent()
  btrfs: qgroup: fix off-by-one max level check in qgroup_trace_new_subtree_blocks()
  btrfs: abort transaction on qgroup failures in create_pending_snapshot()
  btrfs: qgroup: merge error labels in btrfs_quota_enable()
  btrfs: qgroup: fix leak of qgroups in rb tree after failure to enable quotas
  btrfs: qgroup: abort transaction on failure to add qgroup relation
  btrfs: qgroup: fix swapped blocks existence check when tracing after COW
  btrfs: introduce more accurate usebackuproot options
  btrfs: always use the second newest slot for rescue=usebackuproot
  btrfs: raid56: do not verify the content if there is no data checksum
  btrfs: qgroup: do not leak -ENOENT from btrfs_remove_qgroup()
  btrfs: qgroup: use qgroup_mark_inconsistent() in quick_update_accounting()
  btrfs: qgroup: do not treat "ret > 0" as error when deleting a qgroup
  ...

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