'\" t
.\"     Title: btrfs-check
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 11/22/2014
.\"    Manual: Btrfs Manual
.\"    Source: Btrfs v3.17
.\"  Language: English
.\"
.TH "BTRFS\-CHECK" "8" "11/22/2014" "Btrfs v3\&.17" "Btrfs Manual"
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.SH "NAME"
btrfs-check \- check or repair a btrfs filesystem offline
.SH "SYNOPSIS"
.sp
\fBbtrfs check\fR [options] \fI<device>\fR
.SH "DESCRIPTION"
.sp
\fBbtrfs check\fR is used to check or repair a btrfs filesystem offline\&.
.if n \{\
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.\}
.RS 4
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.br
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\fBNote\fR
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.sp
Since btrfs is under heavy development especially the \fBbtrfs check\fR command, it is \fBhighly\fR recommended to read the following btrfs wiki before executing \fBbtrfs check\fR with \fI\-\-repair\fR option: \m[blue]\fBhttps://btrfs\&.wiki\&.kernel\&.org/index\&.php/Btrfsck\fR\m[]
.sp .5v
.RE
.sp
\fBbtrfsck\fR is an alias of \fBbtrfs check\fR command and is now deprecated\&.
.SH "OPTIONS"
.PP
\-s|\-\-super \fI<superblock>\fR
.RS 4
use \*(Aq<superblock>\*(Aqth superblock copy\&.
.RE
.PP
\-\-repair
.RS 4
try to repair the filesystem\&.
.RE
.PP
\-\-init\-csum\-tree
.RS 4
create a new CRC tree\&.
.RE
.PP
\-\-init\-extent\-tree
.RS 4
create a new extent tree\&.
.RE
.PP
\-\-check\-data\-csum
.RS 4
verify checkums of data blocks\&.
.RE
.SH "EXIT STATUS"
.sp
\fBbtrfs check\fR returns a zero exit status if it succeeds\&. Non zero is returned in case of failure\&.
.SH "AVAILABILITY"
.sp
\fBbtrfs\fR is part of btrfs\-progs\&. Please refer to the btrfs wiki \m[blue]\fBhttp://btrfs\&.wiki\&.kernel\&.org\fR\m[] for further details\&.
.SH "SEE ALSO"
.sp
\fBmkfs\&.btrfs\fR(8), \fBbtrfs\-scrub\fR(8), \fBbtrfs\-rescue\fR(8)