On Wed, Oct 27, 2010 at 7:19 PM, Anthony Liguori <aligu...@us.ibm.com> wrote:
> Signed-off-by: Anthony Liguori <aligu...@us.ibm.com>
>
> diff --git a/block.c b/block.c
> index 1a965b2..00b6f21 100644
> --- a/block.c
> +++ b/block.c
> @@ -603,10 +603,16 @@ int bdrv_open(BlockDriverState *bs, const char
> *filename, int flags,
> BlockDriver *back_drv = NULL;
>
> bs->backing_hd = bdrv_new("");
> - path_combine(backing_filename, sizeof(backing_filename),
> - filename, bs->backing_file);
> - if (bs->backing_format[0] != '\0')
> - back_drv = bdrv_find_format(bs->backing_format);
> + back_drv = bdrv_find_protocol(bs->backing_file);
> + if (!back_drv) {
> + path_combine(backing_filename, sizeof(backing_filename),
> + filename, bs->backing_file);
> + if (bs->backing_format[0] != '\0')
> + back_drv = bdrv_find_format(bs->backing_format);
> + } else {
> + pstrcpy(backing_filename, sizeof(backing_filename),
> + bs->backing_file);
> + }
>
> /* backing files always opened read-only */
> back_flags =
> --
> 1.7.0.4
I think this makes sense.
Now it is possible to specify backing files that are relative to
QEMU's current working directory using file:filename. I don't see
harm in this.
Stefan
