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.TH "BTRFS-MAP-LOGICAL" "8" "Apr 30, 2023" "6.2" "BTRFS"
.SH NAME
btrfs-map-logical \- map btrfs logical extent to physical extent
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.SH SYNOPSIS
.sp
\fBbtrfs\-map\-logical\fP <options> <device>
.SH DESCRIPTION
.sp
\fBbtrfs\-map\-logical\fP can be used to find out what the physical offsets are
on the mirrors, the result is dumped to stdout by default.
.sp
Mainly used for debug purpose.
.SH OPTIONS
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.TP
.B \-l|\-\-logical <logical_num>
Logical extent to map.
.TP
.B \-c|\-\-copy <copy>
Copy of the extent to read(usually 1 or 2).
.TP
.B \-o|\-\-output <filename>
Output file to hold the extent.
.TP
.B \-b|\-\-bytes <bytes>
Number of bytes to read.
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.SH EXIT STATUS
.sp
\fBbtrfs\-map\-logical\fP will return 0 if no error happened.
If any problems happened, 1 will be returned.
.SH SEE ALSO
.sp
mkfs.btrfs(8)
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