btrfs-filesystem

Show usage statistics

$ btrfs filesystem usage path/to/mount

$ sudo btrfs filesystem show path/to/mount

$ sudo btrfs filesystem defragment -v path/to/file

$ sudo btrfs filesystem defragment -v -r path/to/dir

$ sudo btrfs filesystem sync path/to/mount

$ sudo btrfs filesystem du -s path/to/dir

$ sudo btrfs filesystem mkswapfile --size 8g path/to/swapfile

btrfs filesystem command [OPTIONS] [path]

btrfs filesystem manages btrfs filesystem properties and operations including usage statistics, defragmentation, synchronization, and device information display.

usage

Show detailed filesystem space usage

Display filesystem information and device usage

Show disk space usage similar to df command

Defragment files or directories

Force sync unwritten data to disk

Calculate disk usage for files and directories

Create a swap file properly formatted for btrfs

Enable verbose output

Recursive operation for defragment and du

Show only summary for du command

Defragmentation may break reflinks and reduce deduplication benefits. Running defragment while deduplication is active can cause issues. The df command may show different values than standard df due to btrfs's space accounting.

btrfs filesystem is part of the btrfs-progs package for managing btrfs filesystems on Linux.

btrfs(8), btrfs-device(8), df(1)