Re: [PATCH 4/4] virtio_blk: use disk_name_format() to support massof disks naming

[Michael S. Tsirkin]

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@xxxxxxxxxxxxxx>
> 
> 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?

Yes they could and yes it's way too late to change device
names for virtio - if we did this will break countless setups.

>  [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.

Right. virtio would have to use the legacy one though.

> -- 
> tejun
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