From: Joe Thornber <ejt@redhat.com>
Date: Fri, 10 May 2013 13:37:19 +0000 (+0100)
Subject: dm thin: open dev read only when possible
X-Git-Tag: v3.10-rc1~12^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5d0db96d13a4e2cd22b52494fb19ce5a9c8b8d90;p=pandora-kernel.git

dm thin: open dev read only when possible

If a thin pool is created in read-only-metadata mode then only open the
metadata device read-only.

Previously it was always opened with FMODE_READ | FMODE_WRITE.

(Note that dm_get_device() still allows read-only dm devices to be used
read-write at the moment: If I create a read-only linear device for the
metadata, via dmsetup load --readonly, then I can still create a rw pool
out of it.)

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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