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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.
AUTHOR
------
Written by Shilong Wang and Wenruo Qu.
COPYRIGHT
---------
Copyright (C) 2013 FUJITSU LIMITED.
License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
--------
`mkfs.btrfs`(8)
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