linux-kernel - Re: [PATCH 4/7] aoe: make dynamic block minor numbers the default

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Message-ID: <4FD96533-B1C0-4795-993C-AE188AD894D9@coraid.com>
Date:	Tue, 2 Oct 2012 17:50:55 -0500
From:	Ed Cashin <ecashin@...aid.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/7] aoe: make dynamic block minor numbers the default

On Oct 2, 2012, at 5:17 PM, Andrew Morton wrote:
...
>> The static arrangement is still available with aoe_dyndevs=0, and
>> the aoe-stat tool from the userland aoetools package, the user
>> space counterpart to the aoe driver, recognizes the case where
>> there is a mismatch between the minor number in sysfs and the
>> minor number in a special device file.
> 
> Oh.  There we are.
> 
> Again, what are the back-(in)compatibility issues which users might
> encounter with this?

I think the people who care about aoe_dyndevs=0 are the people creating
an initramfs without udev and with AoE targets that have low shelf and
slot numbers for addresses.

They might want a tiny bzImage that can boot off AoE storage using
device nodes prepared in advance with mknod.  The old static mapping
is a nice fit for that use case.

There could be others with a reason not to use udev, but none of those
others have ever communicated with me, if they exist.

It's probably confusing the way I did the commits, making static the
default before explicitly changing it to dynamic, but usually the people
who actually care about this are so technical that I expect them to read
the git logs, and I wanted to leave a paper trail there for anyone reading
later.

-- 
  Ed Cashin
  ecashin@...aid.com

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