'\" t
.\"     Title: btrfs-show-super
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
.\"      Date: 06/20/2015
.\"    Manual: Btrfs Manual
.\"    Source: Btrfs v3.17
.\"  Language: English
.\"
.TH "BTRFS\-SHOW\-SUPER" "8" "06/20/2015" "Btrfs v3\&.17" "Btrfs Manual"
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.SH "NAME"
btrfs-show-super \- show btrfs superblock information stored in devices
.SH "SYNOPSIS"
.sp
\fBbtrfs\-show\-super\fR [options] \fI<dev>\fR [\fI<dev>\fR\&...]
.SH "DESCRIPTION"
.sp
\fBbtrfs\-show\-super\fR is used to print the information of superblock, you can specify which mirror to print out\&.
.sp
By default, every device\(cqs first superblock will be printed out\&.
.sp
Mainly used for debug purpose\&.
.SH "OPTIONS"
.PP
\-f
.RS 4
Print full superblock information\&.
.sp
Including the system chunk array and backup roots\&.
.RE
.PP
\-a
.RS 4
Print information of all superblocks\&.
.sp
If this option is given,
\fI\-i\fR
option will be ignored\&.
.RE
.PP
\-i \fI<super_mirror>\fR
.RS 4
Specify which mirror to print out\&.
.sp
\fI<super_mirror>\fR
is between 0 and 2\&. If several
\fI\-i \*(Aq<super_mirror>\fR\*(Aq are given, only the last one is valid\&.
.RE
.PP
\-F
.RS 4
Attempt to print the superblock even if no superblock magic is found\&. May end badly\&.
.RE
.SH "EXIT STATUS"
.sp
\fBbtrfs\-show\-super\fR will return 0 if no error happened\&. If any problems happened, 1 will be returned\&.
.SH "SEE ALSO"
.sp
\fBmkfs\&.btrfs\fR(8)