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

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Message-ID: <4F825BE7.80204@cn.fujitsu.com>
Date:	Mon, 09 Apr 2012 11:47:51 +0800
From:	Ren Mingxin <renmx@...fujitsu.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Tejun Heo <tj@...nel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jens Axboe <axboe@...nel.dk>, KVM <kvm@...r.kernel.org>,
	SCSI <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...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 04/04/2012 04:01 PM, Michael S. Tsirkin wrote:
> On Mon, Apr 02, 2012 at 12:00:45PM -0700, Tejun Heo wrote:
>> On Mon, Apr 02, 2012 at 11:56:18AM -0700, James Bottomley wrote:
>>> So if we're agreed no other devices going forwards should ever use this
>>> interface, is there any point unifying the interface?  No matter how
>>> many caveats you hedge it round with, putting the API in a central place
>>> will be a bit like a honey trap for careless bears.   It might be safer
>>> just to leave it buried in the three current drivers.
>> Yeah, that was my hope but I think it would be easier to enforce to
>> have a common function which is clearly marked legacy so that new
>> driver writers can go look for the naming code in the existing ones,
>> find out they're all using the same function which is marked legacy
>> and explains what to do for newer drivers.
> I think I'm not the only one to be confused about the
> preferred direction here.
> James, do you agree to the approach above?
>
> It would be nice to fix virtio block for 3.4, so
> how about this:
> - I'll just apply the original bugfix patch for 3.4 -
>    it only affects virtio

Sorry, about only affects virtio, I'm not very clear here:
1) Just duplicate the disk name format function in virtio_blk
     like the original patch: https://lkml.org/lkml/2012/3/28/45
2) Move the disk name format function into block core like
     this patch series but only affects virtio(not affect mtip32xx).
Do you mean the 2) one or something else?

> - Ren will repost the refactoring patch on top, and we can
>    keep up the discussion
>
> Ren if you agree, can you make this a two patch series please?
>

Sure.

-- 
Thanks,
Ren

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