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

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Message-ID: <4F78FE89.2070707@cn.fujitsu.com>
Date:	Mon, 02 Apr 2012 09:19:05 +0800
From:	Ren Mingxin <renmx@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>
CC:	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 03/30/2012 11:28 PM, Tejun Heo wrote:
> On Fri, Mar 30, 2012 at 08:26:06AM -0700, Tejun Heo wrote:
>> 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".
> And also let's make that clear in the function name - say,
> format_legacy_disk_name() or something.

So, to legacy disks [sh]d, we'd name them as [sh]d[a-z]{1,}. To new devices
like vd, we'd name them as vd<index>(vd<index>p<partno> as partitions)?
And how about the rssd in the patch 3 then?

Besides, does anybody have comments?
Looking forward to your replies ;-)

-- 
Thanks,
Ren

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