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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 filesystem
--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 checksums 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)
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