The btrfs check command is a command-line utility in Linux that is used to check the integrity and consistency of a btrfs file system. btrfs check is a utility that is included in the btrfs-progs package, which is a collection of tools and libraries for managing btrfs file systems.
Btrfs is a copy-on-write (CoW) file system that is included in the Linux kernel and is known for its advanced features and capabilities, such as snapshotting, incremental backups, and more. btrfs check is a tool that allows you to verify the integrity and consistency of a btrfs file system and detect any errors or problems that may affect its performance or stability.
btrfs check Command Examples
1. Check a btrfs filesystem:
# btrfs check /path/to/partition
2. Check and repair a btrfs filesystem (dangerous):
# btrfs check --repair /path/to/partition
3. Show the progress of the check:
# btrfs check --progress /path/to/partition
4. Verify the checksum of each data block (if the filesystem is good):
# btrfs check --check-data-csum /path/to/partition/
5. Use the n-th superblock (n can be 0, 1 or 2):
# btrfs check --super n /path/to/partition
6. Rebuild the checksum tree:
# btrfs check --repair --init-csum-tree /path/to/partition
7. Rebuild the extent tree:
# btrfs check --repair --init-extent-tree /path/to/partition