ceph-for-5.18-rc1

The highlights are:

- several changes to how snap context and snap realms are tracked
  (Xiubo Li).  In particular, this should resolve a long-standing
  issue of high kworker CPU usage and various stalls caused by
  needless iteration over all inodes in the snap realm.

- async create fixes to address hangs in some edge cases (Jeff Layton)

- support for getvxattr MDS op for querying server-side xattrs, such
  as file/directory layouts and ephemeral pins (Milind Changire)

- average latency is now maintained for all metrics (Venky Shankar)

- some tweaks around handling inline data to make it fit better with
  netfs helper library (David Howells)

Also a couple of memory leaks got plugged along with a few assorted
fixups.  Last but not least, Xiubo has stepped up to serve as a CephFS
co-maintainer.
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