BTRFS-MAP-LOGICAL(8)                       Btrfs Manual                      BTRFS-MAP-LOGICAL(8)



NAME
       btrfs-map-logical - map btrfs logical extent to physical extent

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)



Btrfs v3.17                                 11/22/2014                       BTRFS-MAP-LOGICAL(8)