Fixes for 5.19-rc5:

 - Fix statfs blocking on background inode gc workers
 - Fix some broken inode lock assertion code
 - Fix xattr leaf buffer leaks when cancelling a deferred xattr update
   operation
 - Clean up xattr recovery to make it easier to understand.
 - Fix xattr leaf block verifiers tripping over empty blocks.
 - Remove complicated and error prone xattr leaf block bholding mess.
 - Fix a bug where an rt extent crossing EOF was treated as "posteof"
   blocks and cleaned unnecessarily.
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