btrfs-map-logical

BTRFS-MAP-LOGICAL(8) BTRFS 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 to stdout by 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.