btrfs: sysfs label interface should check for read only FS
authorAnand Jain <Anand.Jain@oracle.com>
Wed, 30 Jul 2014 12:04:10 +0000 (20:04 +0800)
committerChris Mason <clm@fb.com>
Wed, 17 Sep 2014 20:38:01 +0000 (13:38 -0700)
Not sure how this escaped many eyes so far

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>

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