btrfs-check(8) ============== NAME ---- btrfs-check - check or repair an unmounted btrfs filesystem SYNOPSIS -------- *btrfs check* [options] DESCRIPTION ----------- *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. OPTIONS ------- -s|--super :: use 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 :: show extent state for a subvolume --tree-root :: use the given bytenr for the tree root EXIT STATUS ----------- *btrfs check* returns a zero exit status if it succeeds. Non zero is returned in case of failure. AVAILABILITY ------------ *btrfs* is part of btrfs-progs. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for further details. SEE ALSO -------- `mkfs.btrfs`(8), `btrfs-scrub`(8), `btrfs-rescue`(8)