NAME

       btrfs-check - check or repair an unmounted btrfs filesystem

SYNOPSIS

       btrfs check [options] <device>

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 <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

       -p|--progress
           indicate progress at various checking phases

       --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

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)