[Qemu-devel] Re: [PATCH 2/2] Add serial number support for virtio_blk, V4

[Jens Axboe]

On Mon, Jun 01 2009, Rusty Russell wrote:
> On Fri, 29 May 2009 01:45:27 pm john cooper wrote:
> > virtio_blk-serial-4.patch
> 
> Hate to ask dumb questions, but is there a scsi equivalent of this?  It'd be 
> nice if we could avoid being ATA-specific in the long run...

SCSI has mode pages, where ATA pretty much stuffs everything into the
identify data.

> Also, why u16?

The identify page is word based, so u16 makes sense.

> 
> Thanks,
> Rusty.
> 
> > +/* return ATA identify data
> > + */
> > +static int virtblk_identify(struct gendisk *disk, void *argp)
> > +{
> > +   struct virtio_blk *vblk = disk->private_data;
> > +   u16 *id;
> > +   int err = -ENOMEM;
> > +
> > +   id = kmalloc(VIRTIO_BLK_ID_BYTES, GFP_KERNEL);
> > +   if (!id)
> > +           goto out;
> > +
> > +   err = virtio_config_buf(vblk->vdev, VIRTIO_BLK_F_IDENTIFY,
> > +           offsetof(struct virtio_blk_config, identify), id,
> > +           VIRTIO_BLK_ID_BYTES);
> 

-- 
Jens Axboe