block: do not probe zero-sized disks

A blank CD or DVD is visible as a zero-sized disks. Probing such disks will lead to an EIO and a failure to start the VM. Treating them as raw is a better solution. Signed-off-by: Paolo Bonzini <[email protected]> Signed-off-by: Kevin Wolf <[email protected]>
0x3h · Jan 14, 2013 · 8e89559 · 8e89559
1 parent 63fb259
commit 8e89559
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/block.c b/block.c
@@ -527,7 +527,7 @@ static int find_image_format(BlockDriverState *bs, const char *filename,
     int ret = 0;
 
     /* Return the raw BlockDriver * to scsi-generic devices or empty drives */
-    if (bs->sg || !bdrv_is_inserted(bs)) {
+    if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) {
         drv = bdrv_find_format("raw");
         if (!drv) {
             ret = -ENOENT;