diff options
| -rw-r--r-- | block/qcow2-cluster.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 36c1bed350..9499df9ef2 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -380,6 +380,10 @@ static int coroutine_fn copy_sectors(BlockDriverState *bs, BLKDBG_EVENT(bs->file, BLKDBG_COW_READ); + if (!bs->drv) { + return -ENOMEDIUM; + } + /* Call .bdrv_co_readv() directly instead of using the public block-layer * interface. This avoids double I/O throttling and request tracking, * which can lead to deadlock when block layer copy-on-read is enabled. |