Manpage/btrfs-check

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btrfs-check(8) Manual Page

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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 filesystem
-b|--backup
use the first backup roots stored in the superblock that is valid
--repair
try to repair the filesystem
--readonly
run in read-only mode (default)
--init-csum-tree
create a new CRC tree and recalculate all checksums
--init-extent-tree
create a new extent tree
--check-data-csum
verify checksums of data blocks
-p|--progress
indicate progress at various checking phases
--qgroup-report
verify qgroup accounting and compare against filesystem accounting
-E|--subvol-extents <subvolid>
show extent state for the given subvolume
-r|--tree-root <bytenr>
use the given bytenr for the tree root
--chunk-root <bytenr>
use the given bytenr for the chunk 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)

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