From: Josef Bacik <josef@redhat.com>
Date: Fri, 22 Oct 2010 19:26:53 +0000 (-0400)
Subject: Btrfs: fix error handling in btrfs_get_sb
X-Git-Tag: v2.6.37-rc1~19^2~22^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0e78340f3c1fc603e8016c8ac304766bcc65506e;p=pandora-kernel.git

Btrfs: fix error handling in btrfs_get_sb

If we failed to find the root subvol id, or the subvol=<name>, we would
deactivate the locked super and close the devices.  The problem is at this point
we have gotten the SB all setup, which includes setting super_operations, so
when we'd deactiveate the super, we'd do a close_ctree() which closes the
devices, so we'd end up closing the devices twice.  So if you do something like
this

mount /dev/sda1 /mnt/test1
mount /dev/sda1 /mnt/test2 -o subvol=xxx
umount /mnt/test1

it would blow up (if subvol xxx doesn't exist).  This patch fixes that problem.
Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
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