Re: add rules for new aoe character devices

[Kay Sievers <kay.sievers@vrfy.org>]

On Mon, 2007-12-10 at 10:34 -0500, Ed L. Cashin wrote:
> On Mon, Dec 03, 2007 at 07:42:58PM +0100, Kay Sievers wrote:
> > On Mon, 2007-12-03 at 13:38 -0500, Ed L. Cashin wrote:
> > > On Mon, Dec 03, 2007 at 07:15:03PM +0100, Kay Sievers wrote:
> ...
> > > > Does this rule work for you? It should move all nodes into a subdir:
> > > >   SUBSYSTEM="aoe",              NAME="etherd/%k"
> > > 
> > > Yes, that's good for the block devices.  In the past it seems that
> > > rule doesn't guarantee the creation of the character device nodes,
> > > though, and that is why there is a separate rule for each character
> > > node in the patch I sent.  I haven't checked yet whether the latest
> > > udev and kernel still behave the same way.
> > 
> > Block devices always have SUBSYSTEM="block", this will only handle the
> > char devices. You want the block devices to be in a subdir?
> 
> Yes, the normal arrangement is for the "etherd" subdirectory in /dev
> to contain the character and block devices for the aoe driver.  It
> looks like,
> 
>   ecashin@ellijay:~$ ls -l /dev/etherd 
>   total 0
>   c-w--w---- 1 root disk 152,  3 Dec  7 16:24 discover
>   brw-rw---- 1 root disk 152, 16 Dec  7 17:02 e7.0
>   brw-rw---- 1 root disk 152,  0 Dec  7 17:02 e7.1
>   cr--r----- 1 root disk 152,  2 Dec  7 16:24 err
>   c-w--w---- 1 root disk 152,  6 Dec  7 16:24 flush
>   c-w--w---- 1 root disk 152,  4 Dec  7 16:24 interfaces
>   c-w--w---- 1 root disk 152,  5 Dec  7 16:24 revalidate
>   ecashin@ellijay:~$ 
> 
> (The block device minor numbers are different for this aoe6-55 driver
> than they would be for earlier versions.  This aoe6-55 driver relies
> on udev and assigns minor numbers dynamically.  Older drivers can't do
> that, and so have a more limited range of possible AoE shelf and slot
> addresses.)

I see, the block device nodes have the "etherd/" prefix in the kernel,
so they don't need a udev rule to move them there. The name in sysfs has
a '!', like "/sys/block/etherd!e7.0/", right?

Kay


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