BTRFS-MAP-LOGICAL - reference manual online

Map btrfs logical extent to physical extent.

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 v4.4 06/15/2017 BTRFS-MAP-LOGICAL(8)
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btrfs-map-logical(8) referred by
refer to mkfs.btrfs(8)