Changes since last update:

- Fix a locking problem during xattr block conversion that could lead to
  the log checkpointing thread to try to write an incomplete buffer to
  disk, which leads to a corruption shutdown
- Fix a null pointer dereference when removing delayed allocation extents
- Remove post-eof speculative allocations when reflinking a block past
  current inode size so that we don't just leave them there and assert on
  inode reclaim
- Relax an assert which didn't accurately reflect the way locking works
  and would trigger under heavy io load
- Avoid infinite loop when cancelling copy on write extents after a
  writeback failure
- Try to avoid copy on write transaction reservation overflows when
  remapping after a successful write
- Fix various problems with the copy-on-write reservation automatic
  garbage collection not being cleaned up properly during a ro remount
- Fix problems with rmap log items being processed in the wrong order,
  leading to corruption shutdowns
- Fix problems with EFI recovery wherein the "remove any rmapping if
  present" mechanism wasn't actually doing anything, which would lead
  to corruption problems later when the extent is reallocated, leading
  to multiple rmaps for the same extent
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