From: Miao Xie <miaox@cn.fujitsu.com>
Date: Mon, 22 Oct 2012 11:39:53 +0000 (+0000)
Subject: Btrfs: do not delete a subvolume which is in a R/O subvolume
X-Git-Tag: v3.8-rc5~1^2~10^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5c39da5b6ca23e68e7acea7f4c01470383475214;p=pandora-kernel.git

Btrfs: do not delete a subvolume which is in a R/O subvolume

Step to reproduce:
 # mkfs.btrfs <disk>
 # mount <disk> <mnt>
 # btrfs sub create <mnt>/subv0
 # btrfs sub snap <mnt> <mnt>/subv0/snap0
 # change <mnt>/subv0 from R/W to R/O
 # btrfs sub del <mnt>/subv0/snap0

We deleted the snapshot successfully. I think we should not be able to delete
the snapshot since the parent subvolume is R/O.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
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