Am 16.08.2013 um 16:15 hat Laszlo Ersek geschrieben:
> On 08/05/13 15:03, Paolo Bonzini wrote:
> >
> > [...]
> >
> > 3) These members are special
> >
> > .format_name is the string "raw"
> > .bdrv_open raw_open should set bs->sg to bs->file->sg and return 0
> > .bdrv_close raw_close should do nothing
> > .bdrv_probe raw_probe should just return 1.
>
> Signed-off-by: Laszlo Ersek <ler...@redhat.com>
> ---
> block/raw_bsd.c | 20 ++++++++++++++++++++
> 1 files changed, 20 insertions(+), 0 deletions(-)
>
> diff --git a/block/raw_bsd.c b/block/raw_bsd.c
> index 5bcbe71..86e018d 100644
> --- a/block/raw_bsd.c
> +++ b/block/raw_bsd.c
> @@ -112,3 +112,23 @@ static TYPE raw_create(void)
> {
> return bdrv_create_file();
> }
> +
> +static const char *raw_format_name(void)
> +{
> + return "raw";
> +}
> +
> +static int raw_open(BlockDriverState *bs)
> +{
> + bs->sg = bs->file->sg;
I know that Paolo explicitly made this requirement, but I think it is
ugly. We should instead fix bdrv_is_sg() to look at bs->file if it
exists, like many other functions already do, and change the two readers
of bs->sg in block.c to use bdrv_is_sg().
> + return 0;
> +}
> +
> +static void raw_close(void)
> +{
> +}
> +
> +static int raw_probe(void)
> +{
> + return 1;
> +}
Maybe add a comment here like "smallest possible positive score so that
raw is used if and only if no other block driver works".
Kevin
