Merge tag 'for-5.10-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs updates from David Sterba:
 "Mostly core updates with a few user visible bits and fixes.

  Hilights:

   - fsync performance improvements
      - less contention of log mutex (throughput +4%, latency -14%,
        dbench with 32 clients)
      - skip unnecessary commits for link and rename (throughput +6%,
        latency -30%, rename latency -75%, dbench with 16 clients)
      - make fast fsync wait only for writeback (throughput +10..40%,
        runtime -1..-20%, dbench with 1 to 64 clients on various
        file/block sizes)

   - direct io is now implemented using the iomap infrastructure, that's
     the main part, we still have a workaround that requires an iomap
     API update, coming in 5.10

   - new sysfs exports:
      - information about the exclusive filesystem operation status
        (balance, device add/remove/replace, ...)
      - supported send stream version

  Core:

   - use ticket space reservations for data, fair policy using the same
     infrastructure as metadata

   - preparatory work to switch locking from our custom tree locks to
     standard rwsem, now the locking context is propagated to all
     callers, actual switch is expected to happen in the next dev cycle

   - seed device structures are now using list API

   - extent tracepoints print proper tree id

   - unified range checks for extent buffer helpers

   - send: avoid using temporary buffer for copying data

   - remove unnecessary RCU protection from space infos

   - remove unused readpage callback for metadata, enabling several
     cleanups

   - replace indirect function calls for end io hooks and remove
     extent_io_ops completely

  Fixes:

   - more lockdep warning fixes

   - fix qgroup reservation for delayed inode and an occasional
     reservation leak for preallocated files

   - fix device replace of a seed device

   - fix metadata reservation for fallocate that leads to transaction
     aborts

   - reschedule if necessary when logging directory items or when
     cloning lots of extents

   - tree-checker: fix false alert caused by legacy btrfs root item

   - send: fix rename/link conflicts for orphanized inodes

   - properly initialize device stats for seed devices

   - skip devices without magic signature when mounting

  Other:

   - error handling improvements, BUG_ONs replaced by proper handling,
     fuzz fixes

   - various function parameter cleanups

   - various W=1 cleanups

   - error/info messages improved

  Mishaps:

   - commit 62cf5391209a ("btrfs: move btrfs_rm_dev_replace_free_srcdev
     outside of all locks") is a rebase leftover after the patch got
     merged to 5.9-rc8 as a466c85edc6f ("btrfs: move
     btrfs_rm_dev_replace_free_srcdev outside of all locks"), the
     remaining part is trivial and the patch is in the middle of the
     series so I'm keeping it there instead of rebasing"

* tag 'for-5.10-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (161 commits)
  btrfs: rename BTRFS_INODE_ORDERED_DATA_CLOSE flag
  btrfs: annotate device name rcu_string with __rcu
  btrfs: skip devices without magic signature when mounting
  btrfs: cleanup cow block on error
  btrfs: remove BTRFS_INODE_READDIO_NEED_LOCK
  fs: remove no longer used dio_end_io()
  btrfs: return error if we're unable to read device stats
  btrfs: init device stats for seed devices
  btrfs: remove struct extent_io_ops
  btrfs: call submit_bio_hook directly for metadata pages
  btrfs: stop calling submit_bio_hook for data inodes
  btrfs: don't opencode is_data_inode in end_bio_extent_readpage
  btrfs: call submit_bio_hook directly in submit_one_bio
  btrfs: remove extent_io_ops::readpage_end_io_hook
  btrfs: replace readpage_end_io_hook with direct calls
  btrfs: send, recompute reference path after orphanization of a directory
  btrfs: send, orphanize first all conflicting inodes when processing references
  btrfs: tree-checker: fix false alert caused by legacy btrfs root item
  btrfs: use unaligned helpers for stack and header set/get helpers
  btrfs: free-space-cache: use unaligned helpers to access data
  ...

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