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-rw-r--r--blockdev.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/blockdev.c b/blockdev.c
index 330aa4a3a4..44755e1a5d 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2021,6 +2021,9 @@ void qmp_drive_mirror(const char *device, const char *target,
if (!source && sync == MIRROR_SYNC_MODE_TOP) {
sync = MIRROR_SYNC_MODE_FULL;
}
+ if (sync == MIRROR_SYNC_MODE_NONE) {
+ source = bs;
+ }
size = bdrv_getlength(bs);
if (size < 0) {