btrfs-check − check or repair an unmounted btrfs filesystem
btrfs check [options] <device>
btrfs check is used to check or repair an unmounted btrfs filesystem.
Note
Since btrfs is under development, the btrfs check
capabilities are continuously enhanced. It’s highly
recommended to read the following btrfs wiki before
executing btrfs check with
−−repair option:
https://btrfs.wiki.kernel.org/index.php/Btrfsck
btrfsck is an alias of btrfs check command and is now deprecated.
−s|−−super <superblock>
use <superblock>th superblock copy, valid values are 0 up to 2 if the respective superblock offset is within the fileystem
−−repair
try to repair the filesystem
−−init−csum−tree
create a new CRC tree and recalculate all checksums
−−init−extent−tree
create a new extent tree
−−check−data−csum
verify checkums of data blocks
−−qgroup−report
verify qgroup accounting and compare against filesystem accounting
−−subvol−extents <subvolid>
show extent state for a subvolume
−−tree−root <bytenr>
use the given bytenr for the tree root
btrfs check returns a zero exit status if it succeeds. Non zero is returned in case of failure.
btrfs is part of btrfs−progs. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for further details.
mkfs.btrfs(8), btrfs−scrub(8), btrfs−rescue(8)