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> Manage btrfs filesystems.
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}
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