block: Introduce BDS.file_child
Store the BdrvChild for bs->file. At this point, bs->file_child->bs just
duplicates the bs->file pointer. Later, it will completely replace it.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/block.c b/block.c
index 1f90b47..75afed1 100644
--- a/block.c
+++ b/block.c
@@ -1487,11 +1487,17 @@
assert(file == NULL);
bs->open_flags = flags;
- ret = bdrv_open_image(&file, filename, options, "file",
- bs, &child_file, true, &local_err);
- if (ret < 0) {
+
+ bs->file_child = bdrv_open_child(filename, options, "file", bs,
+ &child_file, true, &local_err);
+ if (local_err) {
+ ret = -EINVAL;
goto fail;
}
+
+ if (bs->file_child) {
+ file = bs->file_child->bs;
+ }
}
/* Image format probing */
