From: Dan Williams <dan.j.williams@intel.com>
Date: Tue, 11 May 2010 22:25:37 +0000 (+1000)
Subject: md: set mddev readonly flag on blkdev BLKROSET ioctl
X-Git-Tag: v2.6.35-rc1~440^2~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e2218350465e7e0931676b4849b594c978437bce;p=pandora-kernel.git

md: set mddev readonly flag on blkdev BLKROSET ioctl

When the user sets the block device to readwrite then the mddev should
follow suit.  Otherwise, the BUG_ON in md_write_start() will be set to
trigger.

The reverse direction, setting mddev->ro to match a set readonly
request, can be ignored because the blkdev level readonly flag precludes
the need to have mddev->ro set correctly.  Nevermind the fact that
setting mddev->ro to 1 may fail if the array is in use.

Cc: <stable@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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