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

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Message-ID: <4F78FE7F.7070403@cn.fujitsu.com>
Date:	Mon, 02 Apr 2012 09:18:55 +0800
From:	Ren Mingxin <renmx@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
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 03/30/2012 11:38 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
> So, if a device name ends in digit the partition code adds delimiter
> 'p' automatically and this is already in use by md.  So, partitioned
> md devices are named mdDpP where D and P are base 10 number indicating
> the sequence like md12p4.  So, let's please add comment that new
> drivers should name their devices PREFIX%d where the sequence number
> can be allocated by ida.
>
>

Oh, got it. Just like md devices' names.

-- 
Thanks,
Ren

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