Signed-off-by: Fam Zheng <f...@redhat.com>
---
blockdev.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/blockdev.c b/blockdev.c
index 4927914..5831b95 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -3223,6 +3223,9 @@ static BlockJob *do_drive_backup(DriveBackup *backup,
BlockJobTxn *txn,
}
}
if (backup->sync == MIRROR_SYNC_MODE_NONE) {
+ /* FIXME: block layer should really open target with BDRV_O_NO_BACKING
+ * and reuse source's backing chain, if they share one. */
+ flags |= BDRV_O_UNSAFE_READ;
source = bs;
}
--
2.9.3
