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

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

       Mainly used for debug purpose.

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

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

-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.

mkfs.btrfs(8)

6.14                                              Apr 17, 2025                              BTRFS-MAP-LOGICAL(8)

btrfs-map-logical <options> <device>