From: Seunghun Lee <waydi1@gmail.com>
Date: Fri, 2 Jan 2015 17:26:49 +0000 (+0900)
Subject: ovl: Prevent rw remount when it should be ro mount
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~3^2~17^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3cdf6fe91041b3afd6761f76254f7b6cbe8020fc;p=pandora-kernel.git

ovl: Prevent rw remount when it should be ro mount

Overlayfs should be mounted read-only when upper-fs is read-only or nonexistent.
But now it can be remounted read-write and this can cause kernel panic.
So we should prevent read-write remount when the above situation happens.

Signed-off-by: Seunghun Lee <waydi1@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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