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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 <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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block.c
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block.c
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@ -527,7 +527,7 @@ static int find_image_format(BlockDriverState *bs, const char *filename,
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int ret = 0;
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/* Return the raw BlockDriver * to scsi-generic devices or empty drives */
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if (bs->sg || !bdrv_is_inserted(bs)) {
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if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) {
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drv = bdrv_find_format("raw");
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if (!drv) {
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ret = -ENOENT;
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