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

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Message-ID: <20120330153828.GD28934@google.com>
Date:	Fri, 30 Mar 2012 08:38:28 -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 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.

Thanks.

-- 
tejun
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