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.