btrfs-show-super (8)

Leading comments

    Title: btrfs-inspect-internal
   Author: [FIXME: author] [see http://docbook.sf.net/el/author]
Generator: DocBook XSL Stylesheets v1.79.0 <http://docbook.sf.net/>
     Date: 07/28/2017
   Manual: Btrfs Manual
   Source: Btrfs v4.12
 Language: English

NAME

SYNOPSIS

btrfs-show-super [options] <dev> [<dev>...]

DESCRIPTION

btrfs-show-super is used to print the information of superblock, you can specify which mirror to print out.

By default, every devicecqs first superblock will be printed out.

Mainly used for debug purpose.

OPTIONS

-f

Print full superblock information.

Including the system chunk array and backup roots.

-a

Print information of all superblocks.

If this option is given, -i option will be ignored.

-i <super_mirror>

Specify which mirror to print out.

<super_mirror> is between 0 and 2. If several -i <super_mirror> are given, only the last one is valid.

-F

Attempt to print the superblock even if no superblock magic is found. May end badly.

-s <bytenr>

specifiy offset to a superblock in a non-standard location at bytenr, useful for debugging (disables the -f option)

EXIT STATUS

btrfs-show-super will return 0 if no error happened. If any problems happened, 1 will be returned.

SEE ALSO

mkfs.btrfs(8)