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update man page to new defragment command interface

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Update

        btrfs filesystem defragment

command explanation. Add explanation of advanced parameters and notes
about general usage.

Add few notes about the

        btrfs <command> --help

usage, fix related grammar.

Signed-off-by: Hubert Kario <kario@wit.edu.pl>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Hubert Kario 2011-01-23 15:31:07 +00:00 committed by Chris Mason
parent eb5418933f
commit 0646719841
1 changed files with 26 additions and 7 deletions
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33
man/btrfs.8.in
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@ -15,7 +15,7 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBsubvolume set-default\fP\fI <id> <path>\fP
.PP
\fBbtrfs\fP \fBfilesystem defrag\fP\fI <file>|<dir> [<file>|<dir>...]\fP
\fBbtrfs\fP \fBfilesystem defragment\fP\fI [-vcf] [-s start] [-l len] [-t size] <file>|<dir> [<file>|<dir>...]\fP
.PP
\fBbtrfs\fP \fBfilesystem sync\fP\fI <path> \fP
.PP
@ -34,6 +34,8 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBhelp|\-\-help|\-h \fP\fI\fP
.PP
\fBbtrfs\fP \fB<command> \-\-help \fP\fI\fP
.PP
.SH DESCRIPTION
.B btrfs
is used to control the filesystem and the files and directories stored. It is
@ -60,12 +62,12 @@ returns an error.
If a command is terminated by
.I --help
, the relevant help is showed. If the passed command matches more commands,
the help of all the matched commands are showed. For example
, the detailed help is showed. If the passed command matches more commands,
detailed help of all the matched commands is showed. For example
.I btrfs dev --help
shows the help of all
.I device*
command.
commands.
.SH COMMANDS
.TP
@ -98,12 +100,29 @@ mount time via the \fIsubvol=\fR option.
\fBsubvolume set-default\fR\fI <id> <path>\fR
Set the subvolume of the filesystem \fI<path>\fR which is mounted as
\fIdefault\fR. The subvolume is identified by \fB<id>\fR, which
\fIdefault\fR. The subvolume is identified by \fI<id>\fR, which
is returned by the \fBsubvolume list\fR command.
.TP
\fBfilesystem defragment\fP\fI <file>|<dir> [<file>|<dir>...]\fR
Defragment files and/or directories.
\fBfilesystem defragment\fP\fI [-vcf] [-s start] [-l len] [-t size] <file>|<dir> [<file>|<dir>...]\fR
Defragment file data and/or directory metadata. To defragment all files in a
directory you have to specify each one on its own or use your shell wildcards.
\fB-v\fP be verbose
\fB-c\fP compress file contents while defragmenting
\fB-f\fP flush filesystem after defragmenting
\fB-s start\fP defragment only from byte \fIstart\fR onward
\fB-l len\fP defragment only up to \fIlen\fR bytes
\fB-t size\fP defragment only files at least \fIsize\fR bytes big
NOTE: defragmenting with kernels up to 2.6.37 will unlink COW-ed copies of data, don't
use it if you use snapshots, have de-duplicated your data or made copies with
\fBcp --reflink\fP.
.TP
\fBdevice scan\fR \fI[<device> [<device>..]]\fR