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

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Date:	Fri, 30 Mar 2012 08:26:06 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Ren Mingxin <renmx@...fujitsu.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	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

On Fri, Mar 30, 2012 at 05:53:52PM +0800, Ren Mingxin 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.
> 
> 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>

I guess it's already way too late but why couldn't they have been
named vdD-P where both D and P are integers denoting disk number and
partition number?  [sh]dX's were created when there weren't supposed
to be too many disks, so we had to come up with the horrible alphabet
based numbering scheme but vd is new enough.  I mean, naming is one
thing but who wants to figure out which sequence is or guess what
comes next vdzz9?  :(

If we're gonna move it to block layer, let's add big blinking red
comment saying "don't ever use it for any new driver".

Thanks.

-- 
tejun
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