tldr/pages/linux/btrfs-filesystem.md

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# 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}}`