From c1c4d91c38e6e5b29543b02d4a4fb7f007e44f70 Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Thu, 8 May 2008 15:05:58 -0400
Subject: [PATCH] Btrfs: Only open block devices once during mount -o subvol=

btrfs_open_devices needed a check to see if the device was already
open.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Reading git-format-patch failed