@@ -2788,9 +2788,9 @@ static void change_parent_backing_link(BlockDriverState *from,
continue;
}
if (c->role == &child_backing) {
- /* @from is generally not allowed to be a backing file, except for
- * when @to is the overlay. In that case, @from may not be replaced
- * by @to as @to's backing node. */
+ /* If @from is a backing file of @to, ignore the child to avoid
+ * creating a loop. We only want to change the pointer of other
+ * parents. */
QLIST_FOREACH(to_c, &to->children, next) {
if (to_c == c) {
break;
@@ -2801,7 +2801,6 @@ static void change_parent_backing_link(BlockDriverState *from,
}
}
- assert(c->role != &child_backing);
bdrv_ref(to);
bdrv_replace_child(c, to);
bdrv_unref(from);
Now that the backing file child role implements .attach/.detach callbacks, nothing prevents us from modifying the graph even if that involves changing backing file links. Signed-off-by: Kevin Wolf <kwolf@redhat.com> --- block.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)