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 - Fix accounting problems with per-ag reservations causing statfs reports to vary incorrectly