tree c8445152a89596fb1d6895a198327268067b11ae
parent f2bdf9a8f79052e9577936cbe5696c0e232aa0e3
author Jan Schmidt <list.btrfs@jan-o-sch.net> 1361460927 +0000
committer Josef Bacik <jbacik@fusionio.com> 1361894450 -0500

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>