Merge tag 'for-7.4-part2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linuxHEADmaster

Pull more btrfs updates from David Sterba:
 "This removes unused code of free space caching, disabled in 7.3
  (commit 545e560a5b0f: "btrfs: disable v1 space cache").

  It's been the original free space cache feature, superseded by free
  space tree (4.5) and mkfs default since 5.15. The grace period was
  sufficiently long, backward compatibility still exists with a
  performance impact, effectively as if mounted with '-o nospace_cache'"

* tag 'for-7.4-part2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: remove TRANS_JOIN_NOLOCK
  btrfs: stop reading free space inodes from the commit root
  btrfs: stop special-casing free space inodes in the delalloc accounting
  btrfs: remove the free space inode special cases from the COW paths
  btrfs: remove the free space inode ordered extent special cases
  btrfs: remove BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE
  btrfs: remove the free space cache trimming ranges
  btrfs: replace btrfs_set_free_space_cache_v1_active() with a cleanup helper
  btrfs: remove the SPACE_CACHE mount option flag
  btrfs: remove btrfs_disk_cache_state
  btrfs: remove the v1 space cache load path
  btrfs: drop the transaction handle from the prealloc helpers
  btrfs: rename cache_write_mutex to dirty_bgs_update_mutex
  btrfs: remove the v1 space cache write path
  btrfs: remove the free space cache endio workqueue
  btrfs: remove the v1 space cache writeout from the transaction commit
  btrfs: stop enabling the v1 space cache from the on-disk state
  btrfs: update the inode item when removing a free space inode
  btrfs: drop the extent maps of the written part of a failed ordered extent
  btrfs: fix use-after-free on quota enable allocation failure

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