tldr/pages/linux/btrfs-filesystem.md

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}}