btrfs-map-logical (8)

Leading comments

    Title: btrfs-map-logical
   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-map-logical <options> <device>

DESCRIPTION

btrfs-map-logical can be used to find out what the physical offsets are on the mirrors, the result is dumped into stdout in default.

Mainly used for debug purpose.

OPTIONS

-l|--logical <logical_num>

Logical extent to map.

-c|--copy <copy>

Copy of the extent to read(usually 1 or 2).

-o|--output <filename>

Output file to hold the extent.

-b|--bytes <bytes>

Number of bytes to read.

EXIT STATUS

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

SEE ALSO

mkfs.btrfs(8)