Merge tag 'for-5.14-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs updates from David Sterba:
 "A normal mix of improvements, core changes and features that user have
  been missing or complaining about.

  User visible changes:

   - new sysfs exports:
      - add sysfs knob to limit scrub IO bandwidth per device
      - device stats are also available in
           /sys/fs/btrfs/FSID/devinfo/DEVID/error_stats

   - support cancellable resize and device delete ioctls

   - change how the empty value is interpreted when setting a property,
     so far we have only 'btrfs.compression' and we need to distinguish
     a reset to defaults and setting "do not compress", in general the
     empty value will always mean 'reset to defaults' for any other
     property, for compression it's either 'no' or 'none' to forbid
     compression

  Performance improvements:

   - no need for full sync when truncation does not touch extents,
     reported run time change is -12%

   - avoid unnecessary logging of xattrs during fast fsyncs (+17%
     throughput, -17% runtime on xattr stress workload)

  Core:

   - preemptive flushing improvements and fixes
      - adjust clamping logic on multi-threaded workloads to avoid
        flushing too soon
      - take into account global block reserve, may help on almost full
        filesystems
      - continue flushing when there are enough pending delalloc and
        ordered bytes

   - simplify logic around conditional transaction commit, a workaround
     used in the past for throttling that's been superseded by ticket
     reservations that manage the throttling in a better way

   - subpage blocksize preparation:
      - submit read time repair only for each corrupted sector
      - scrub repair now works with sectors and not pages
      - free space cache (v1) works with sectors and not pages
      - more fine grained bio tracking for extents
      - subpage support in page callbacks, extent callbacks, end io
        callbacks

   - simplify transaction abort logic and always abort and don't check
     various potentially unreliable stats tracked by the transaction

   - exclusive operations can do more checks when started and allow eg.
     cancellation of the same running operation

   - ensure relocation never runs while we have send operations running,
     e.g. when zoned background auto reclaim starts

  Fixes:

   - zoned: more sanity checks of write pointer

   - improve error handling in delayed inodes

   - send:
      - fix invalid path for unlink operations after parent
        orphanization
      - fix crash when memory allocations trigger reclaim

   - skip compression of we have only one page (can't make things
     better)

   - empty value of a property newly means reset to default

  Other:

   - lots of cleanups, comment updates, yearly typo fixing

   - disable build on platforms having page size 256K"

* tag 'for-5.14-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (101 commits)
  btrfs: remove unused btrfs_fs_info::total_pinned
  btrfs: rip out btrfs_space_info::total_bytes_pinned
  btrfs: rip the first_ticket_bytes logic from fail_all_tickets
  btrfs: remove FLUSH_DELAYED_REFS from data ENOSPC flushing
  btrfs: rip out may_commit_transaction
  btrfs: send: fix crash when memory allocations trigger reclaim
  btrfs: ensure relocation never runs while we have send operations running
  btrfs: shorten integrity checker extent data mount option
  btrfs: switch mount option bits to enums and use wider type
  btrfs: props: change how empty value is interpreted
  btrfs: compression: don't try to compress if we don't have enough pages
  btrfs: fix unbalanced unlock in qgroup_account_snapshot()
  btrfs: sysfs: export dev stats in devinfo directory
  btrfs: fix typos in comments
  btrfs: remove a stale comment for btrfs_decompress_bio()
  btrfs: send: use list_move_tail instead of list_del/list_add_tail
  btrfs: disable build on platforms having page size 256K
  btrfs: send: fix invalid path for unlink operations after parent orphanization
  btrfs: inline wait_current_trans_commit_start in its caller
  btrfs: sink wait_for_unblock parameter to async commit
  ...

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