btrfs filesystem

Manage btrfs filesystems. More information: https://btrfs.readthedocs.io/en/latest/btrfs-filesystem.html.

• 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