.TH BTRFS-MAP-LOGICAL 8
.SH NAME
btrfs-map-logical \- map btrfs logical extent to physical extent
.SH SYNOPSIS
.B btrfs-map-logical [\fIoptions\fP] \fI<device>\fP
.SH DESCRIPTION
\fBbtrfs-map-logical\fP can be used to find out what the physical offsets are
on the mirrors, the result is dumped into stdout in default.

\fIOptions\fP
.IP "\fB-l|--logical \fI<logical_num>\fP" 5
Logical extent to map.
.IP "\fB-c|--copy \fI<copy>\fP" 5
Copy of the extent to read(usually 1 or 2).
.IP "\fB-o|--output \fI<filename>\fP" 5
Output file to hold the extent.
.IP "\fB-b|--bytes \fI<bytes>\fP" 5
Number of bytes to read.

.SH EXIT CODE
\fBbtrfs-map-logical\fP will return 0 if no error happened.
If any problems happened, 1 will be returned.

.SH AUTHOR
Written by Shilong Wang and Wenruo Qu.

.SH COPYRIGHT
Copyright \(co 2013 Fujitsu, Inc.
License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
.br
This is free software: you are free  to  change  and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.
.SH SEE ALSO
.BR mkfs.btrfs (8)