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btrfs-progs: update man page for btrfs filesystem label 

btrfs filesystem label can work on a mounted filesystem, also on a
multi-devices filesystem. And the restriction of label name is
changed, too. The man page should be updated accordingly.

Signed-off-by: Guangyu Sun <guangyu.sun@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Guangyu Sun 2013-06-17 14:45:23 -07:00 committed by David Sterba
parent 6634da9c9a
commit 668aedeaa6
1 changed files with 4 additions and 13 deletions
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17
man/btrfs.8.in
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@ -265,22 +265,13 @@ it with the new desired size. When recreating the partition make sure to use
the same starting disk cylinder as before.
.TP
\fBfilesystem label\fP\fI <dev> [newlabel]\fP
Show or update the label of a filesystem. \fI<dev>\fR is used to identify the
filesystem.
\fBfilesystem label\fP\fI [<device>|<mountpoint>] [newlabel]\fP
Show or update the label of a filesystem. \fI[<device>|<mountpoint>]\fR is used
to identify the filesystem.
If a \fInewlabel\fR optional argument is passed, the label is changed. The
following constraints exist for a label:
.IP
- the maximum allowable length shall be less or equal than 256 chars
.IP
- the label shall not contain the '/' or '\\' characters.
NOTE: Currently there are the following limitations:
.IP
- the filesystem has to be unmounted
.IP
- the filesystem should not have more than one device.
.TP
- the maximum allowable length shall be less than 256 chars
\fBfilesystem show\fR [--all-devices|<uuid>|<label>]\fR
Show the btrfs filesystem with some additional info. If no \fIUUID\fP or