New code for 5.15:

 - Fix a potential log livelock on busy filesystems when there's so much
   work going on that we can't finish a quotaoff before filling up the log
   by removing the ability to disable quota accounting.
 - Introduce the ability to use per-CPU data structures in XFS so that
   we can do a better job of maintaining CPU locality for certain
   operations.
 - Defer inode inactivation work to per-CPU lists, which will help us
   batch that processing.  Deletions of large sparse files will *appear*
   to run faster, but all that means is that we've moved the work to the
   backend.
 - Drop the EXPERIMENTAL warnings from the y2038+ support and the inode
   btree counters, since it's been nearly a year and no complaints have
   come in.
 - Remove more of our bespoke kmem* variants in favor of using the
   standard Linux calls.
 - Prepare for the addition of log incompat features in upcoming cycles
   by actually adding code to support this.
 - Small cleanups of the xattr code in preparation for landing support
   for full logging of extended attribute updates in a future cycle.
 - Replace the various log shutdown state and flag code all over xfs
   with a single atomic bit flag.
 - Fix a serious log recovery bug where log item replay can be skipped
   based on the start lsn of a transaction even though the transaction
   commit lsn is the key data point for that by enforcing start lsns to
   appear in the log in the same order as commit lsns.
 - Enable pipelining in the code that pushes log items to disk.
 - Drop ->writepage.
 - Fix some bugs in GETFSMAP where the last fsmap record reported for a
   device could extend beyond the end of the device, and a separate bug
   where query keys for one device could be applied to another.
 - Don't let GETFSMAP query functions edit their input parameters.
 - Small cleanups to the scrub code's handling of perag structures.
 - Small cleanups to the incore inode tree walk code.
 - Constify btree function parameters that aren't changed, so that there
   will never again be confusion about range query functions changing
   their input parameters.
 - Standardize the format and names of tracepoint data attributes.
 - Clean up all the mount state and feature flags to use wrapped bitset
   functions instead of inconsistently open-coded flag checks.
 - Fix some confusion between xfs_buf hash table key variable vs. block
   number.
 - Fix a mis-interaction with iomap where we reported shared delalloc
   cow fork extents to iomap, which would cause the iomap unshare
   operation to return IO errors unnecessarily.
 - Fix DONTCACHE behavior.
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