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Re: [Qemu-devel] [PATCH] block: do not probe zero-sized disks
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH] block: do not probe zero-sized disks |
Date: |
Fri, 11 Jan 2013 10:33:25 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Jan 10, 2013 at 03:39:27PM +0100, Paolo Bonzini wrote:
> 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 <address@hidden>
> ---
> block.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/block.c b/block.c
> index c05875f..b9da10e 100644
> --- a/block.c
> +++ b/block.c
> @@ -532,7 +532,7 @@ static int find_image_format(const char *filename,
> BlockDriver **pdrv)
> }
>
> /* 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) {
Looks good but I wouldn't understand the reason for the zero size check
when reading the code. Please add a comment so no one changes/removes
this code in the future.
Stefan