Commit ca60ebfa authored by Jan Schmidt's avatar Jan Schmidt Committed by Josef Bacik

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: default avatarAlex Lyakas <alex.btrfs@zadarastorage.com>
Signed-off-by: default avatarJan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
parent f2bdf9a8
...@@ -352,11 +352,8 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info, ...@@ -352,11 +352,8 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
err = __resolve_indirect_ref(fs_info, search_commit_root, err = __resolve_indirect_ref(fs_info, search_commit_root,
time_seq, ref, parents, time_seq, ref, parents,
extent_item_pos); extent_item_pos);
if (err) { if (err)
if (ret == 0)
ret = err;
continue; continue;
}
/* we put the first parent into the ref at hand */ /* we put the first parent into the ref at hand */
ULIST_ITER_INIT(&uiter); ULIST_ITER_INIT(&uiter);
......
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