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.

       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 CODE

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

AUTHOR

       Written by Shilong Wang and Wenruo Qu.

COPYRIGHT

       Copyright    ©    2013    Fujitsu,    Inc.     License    GPLv2:   GNU   GPL   version   2
       <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free  to   change   and   redistribute   it.  There  is  NO
       WARRANTY, to the extent permitted by law.

SEE ALSO

       mkfs.btrfs(8)

                                                                             BTRFS-MAP-LOGICAL(8)