Changes since last update:

- More metadata validation strengthening to prevent crashes.
- Fix extent offset overflow problem when insert_range on a 512b block fs
- Fix some off-by-one errors in the realtime fsmap code
- Fix some math errors in the default resblks calculation when free space
  is low
- Fix a problem where stale page contents are exposed via mmap read
  after a zero_range at eof
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