• check:
  • check items in tree-log
  • detect invalid file extent items for symlinks
  • properly detect inode cache and suggest removal by 'clear-ino-cache'
• convert: fix symlink length checks
• fi show: remove stray newline at the end of the output
• fixes:
  • open devices in write-exclusive mode in most commands, prevent
    concurrent mount by other programs
  • rescue clear-ino-cache: fix subvolume iteration that can fail in some cases
  • map-logical: fix first extent searching condition
  • fi resize: warn if new size is below 256M
• tree-checker:
  • slightly stricter file type validation
  • verify device extent items
• other:
  • documentation updates
  • ship btrfs-ioctl manual page (incomplete)