btrfs-map-logical

Manual page and help for the btrfs-map-logical linux command | Linux portal

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Manual page and help for the btrfs-map-logical linux command. The btrfs-map-logical command can be used to find out what physical addresses are on the mirrors, and the result is sent to standard output (stdout) by default. It is used primarily for debugging purposes.

 

 

Man page output

man btrfs-map-logical
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 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.

SEE ALSO
       mkfs.btrfs(8)

Btrfs v4.20.1                               01/23/2019                       BTRFS-MAP-LOGICAL(8)

 

 

Help output

sudo btrfs-map-logical --help
btrfs-map-logical: unrecognized option '--help'
usage: btrfs-map-logical [options] device
        -l Logical extent to map
        -c Copy of the extent to read (usually 1 or 2)
        -o Output file to hold the extent
        -b Number of bytes to read

 

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