Assign source image as the backing hd of target bs, so reading target bs
gets the point-in-time copy of data from source image.
Signed-off-by: Fam Zheng <f...@redhat.com>
---
blockdev.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/blockdev.c b/blockdev.c
index 5e694f3..a1d816e 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1504,6 +1504,10 @@ void qmp_drive_backup(const char *device, const char
*target,
return;
}
+ target_bs->backing_hd = bs;
+ pstrcpy(target_bs->backing_file, sizeof(target_bs->backing_file),
+ bs->filename);
+
backup_start(bs, target_bs, speed, on_source_error, on_target_error,
block_job_cb, bs, &local_err);
if (local_err != NULL) {
--
1.8.3.1
