tldr/pages/linux/btrfs-check.md

btrfs check

Check or repair a btrfs filesystem. More information: https://btrfs.readthedocs.io/en/latest/btrfs-check.html.

• Check a btrfs filesystem:

sudo btrfs {{[c|check]}} {{path/to/partition}}

• Check and repair a btrfs filesystem (dangerous):

sudo btrfs {{[c|check]}} --repair {{path/to/partition}}

• Show the progress of the check:

sudo btrfs {{[c|check]}} {{[-p|--progress]}} {{path/to/partition}}

• Verify the checksum of each data block (if the filesystem is good):

sudo btrfs {{[c|check]}} --check-data-csum {{path/to/partition}}

• Use the n-th superblock (n can be 0, 1 or 2):

sudo btrfs {{[c|check]}} {{[-s|--super]}} {{n}} {{path/to/partition}}

• Rebuild the checksum tree:

sudo btrfs {{[c|check]}} --repair --init-csum-tree {{path/to/partition}}

• Rebuild the extent tree:

sudo btrfs {{[c|check]}} --repair --init-extent-tree {{path/to/partition}}