New code for 6.10:

  * Introduce Parent Pointer extended attribute for inodes.

  * Online Repair
    - Implement atomic file content exchanges i.e. exchange ranges of bytes
      between two files atomically.
    - Create temporary files to repair file-based metadata. This uses atomic
      file content exchange facility to swap file fork mappings between the
      temporary file and the metadata inode.

    - Allow callers of directory/xattr code to set an explicit owner number to
      be written into the header fields of any new blocks that are created.
      This is required to avoid walking every block of the new structure and
      modify their ownership during online repair.
    - Repair
      - Extended attributes
      - Inode unlinked state
      - Directories
      - Symbolic links
      - AGI's unlinked inode list.
      - Parent pointers.
    - Move Orphan files to lost and found directory.
    - Fixes for Inode repair functionality.
    - Introduce a new sub-AG FITRIM implementation to reduce the duration for
      which the AGF lock is held.
    - Updates for the design documentation.
    - Use Parent Pointers to assist in checking directories, parent pointers,
      extended attributes, and link counts.

  * Bring back delalloc support for realtime devices which have an extent size
    that is equal to filesystem's block size.

  * Improve performance of log incompat feature handling.

  * Fixes
    - Minor fixes to online repair
    - Fix sparse warnings

  * Cleanups
    - Hold inode locks on all files involved in a rename until the completion
      of the operation. This is in preparation for the parent pointers patchset
      where parent pointers are applied in a separate chained update from the
      actual directory update.
    - Compile out v4 support when disabled.
    - Cleanup xfs_extent_busy_clear().
    - Remove unused flags and fields from struct xfs_da_args.
    - Remove definitions of unused functions.
    - Improve extended attribute validation.
    - Add higher level directory operations helpers to remove duplication of
      code.

Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
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