From: Jan Schmidt <list.btrfs@jan-o-sch.net>
Date: Thu, 21 Feb 2013 15:35:27 +0000 (+0000)
Subject: Btrfs: fix backref walking race with tree deletions
X-Git-Tag: v3.9-rc1~17^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca60ebfa303ca6d9f3cad5028c10f0a17d571a4c;p=pandora-kernel.git

Btrfs: fix backref walking race with tree deletions

When a subvolume is removed, we remove the root item from the root tree,
while the tree blocks and backrefs remain for a while. When backref walking
comes across one of those orphan tree blocks, it can find a backref for a
no longer existing root. This is all good, we only must tolerate
__resolve_indirect_ref returning an error and continue with the good refs
found.

Reported-by: Alex Lyakas <alex.btrfs@zadarastorage.com>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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