New code for 5.20:

- Improve scalability of the XFS log by removing spinlocks and global
  synchronization points.
- Add security labels to whiteout inodes to match the other filesystems.
- Clean up per-ag pointer passing to simplify call sites.
- Reduce verifier overhead by precalculating more AG geometry.
- Implement fast-path lockless lookups in the buffer cache to reduce
  spinlock hammering.
- Make attr forks a permanent part of the inode structure to fix a UAF
  bug and because most files these days tend to have security labels and
  soon will have parent pointers too.
- Clean up XFS_IFORK_Q usage and give it a better name.
- Fix more UAF bugs in the xattr code.
- SOB my tags.
- Fix some typos in the timestamp range documentation.
- Fix a few more memory leaks.
- Code cleanups and typo fixes.
- Fix an unlocked inode fork pointer access in getbmap.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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