BTRFS-CHECK(8)

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

--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)