@@ -3174,6 +3174,7 @@ static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
Error *local_err = NULL;
int flags;
int64_t size;
+ bool set_backing_hd = false;
if (!backup->has_speed) {
backup->speed = 0;
@@ -3224,6 +3225,8 @@ static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
}
if (backup->sync == MIRROR_SYNC_MODE_NONE) {
source = bs;
+ flags |= BDRV_O_NO_BACKING;
+ set_backing_hd = true;
}
size = bdrv_getlength(bs);
@@ -3250,7 +3253,9 @@ static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
}
if (backup->format) {
- options = qdict_new();
+ if (!options) {
+ options = qdict_new();
+ }
qdict_put(options, "driver", qstring_from_str(backup->format));
}
@@ -3261,6 +3266,14 @@ static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
bdrv_set_aio_context(target_bs, aio_context);
+ if (set_backing_hd) {
+ bdrv_set_backing_hd(target_bs, source, &local_err);
+ if (local_err) {
+ bdrv_unref(target_bs);
+ goto out;
+ }
+ }
+
if (backup->has_bitmap) {
bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
if (!bmap) {
Signed-off-by: Fam Zheng <famz@redhat.com> --- blockdev.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)