linux-kernel - Re: [PATCH 4/4] virtio_blk: use disk_name_format() to support mass of disks naming

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Message-ID: <CAFO3S427vWXHBDaRmfwqZrGZ2Y8RPUn7CQswQou9EGMh43jU8Q@mail.gmail.com>
Date:	Fri, 30 Mar 2012 19:22:39 +0800
From:	Asias He <asias.hejun@...il.com>
To:	Ren Mingxin <renmx@...fujitsu.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	SCSI <linux-scsi@...r.kernel.org>, KVM <kvm@...r.kernel.org>,
	VIRTUAL <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 4/4] virtio_blk: use disk_name_format() to support mass of
 disks naming

Hi,  Ren

On Fri, Mar 30, 2012 at 5:53 PM, Ren Mingxin <renmx@...fujitsu.com> wrote:
>  The current virtblk's naming algorithm only supports 263  disks.
> If there are mass of virtblks(exceeding 263), there will be disks
> with the same name.

This fix is pretty nice. However, current virtblk's naming still
supports up to 18278 disks, no?
( index 0  -> vda, index 18277 -> vdzzz ).

> By renaming "sd_format_disk_name()" to "disk_name_format()"
> and moving it into block core, virtio_blk can use this function to
> support mass of disks.
>
> Signed-off-by: Ren Mingxin <renmx@...fujitsu.com>
> ---
>  virtio_blk.c |   13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
>
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index c4a60ba..54612c2 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -442,18 +442,7 @@ static int __devinit virtblk_probe(struct virtio_device
> *vdev)
>
>        q->queuedata = vblk;
>
> -       if (index < 26) {
> -               sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26);
> -       } else if (index < (26 + 1) * 26) {
> -               sprintf(vblk->disk->disk_name, "vd%c%c",
> -                       'a' + index / 26 - 1, 'a' + index % 26);
> -       } else {
> -               const unsigned int m1 = (index / 26 - 1) / 26 - 1;
> -               const unsigned int m2 = (index / 26 - 1) % 26;
> -               const unsigned int m3 =  index % 26;
> -               sprintf(vblk->disk->disk_name, "vd%c%c%c",
> -                       'a' + m1, 'a' + m2, 'a' + m3);
> -       }
> +       disk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
>
>        vblk->disk->major = major;
>        vblk->disk->first_minor = index_to_minor(index);
>
> --
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-- 
Asias He
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