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Enter a command. For example: ledctl, named, wajig, daemonize.

btrfs filesystem

Manage btrfs filesystems. More information: https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-filesystem.

• Show filesystem usage (optionally run as root to show detailed information):
   
  btrfs filesystem usage {{path/to/btrfs_mount}}
   
• Show usage by individual devices:
   
  sudo btrfs filesystem show {{path/to/btrfs_mount}}
   
• Defragment a single file on a btrfs filesystem (avoid while a deduplication agent is running):
   
  sudo btrfs filesystem defragment -v {{path/to/file}}
   
• Defragment a directory recursively (does not cross subvolume boundaries):
   
  sudo btrfs filesystem defragment -v -r {{path/to/directory}}
   
• Force syncing unwritten data blocks to disk(s):
   
  sudo btrfs filesystem sync {{path/to/btrfs_mount}}
   
• Summarize disk usage for the files in a directory recursively:
   
  sudo btrfs filesystem du --summarize {{path/to/directory}}