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>
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@ -265,22 +265,13 @@ it with the new desired size. When recreating the partition make sure to use
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the same starting disk cylinder as before.
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.TP
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\fBfilesystem label\fP\fI <dev> [newlabel]\fP
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Show or update the label of a filesystem. \fI<dev>\fR is used to identify the
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filesystem.
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\fBfilesystem label\fP\fI [<device>|<mountpoint>] [newlabel]\fP
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Show or update the label of a filesystem. \fI[<device>|<mountpoint>]\fR is used
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to identify the filesystem.
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If a \fInewlabel\fR optional argument is passed, the label is changed. The
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following constraints exist for a label:
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.IP
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- the maximum allowable length shall be less or equal than 256 chars
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.IP
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- the label shall not contain the '/' or '\\' characters.
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NOTE: Currently there are the following limitations:
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.IP
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- the filesystem has to be unmounted
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.IP
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- the filesystem should not have more than one device.
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.TP
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- the maximum allowable length shall be less than 256 chars
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\fBfilesystem show\fR [--all-devices|<uuid>|<label>]\fR
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Show the btrfs filesystem with some additional info. If no \fIUUID\fP or
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