linux-kernel - Re: [RFC PATCH] /sys/block -> /sys/class/block (Fedora 3 & 4 testers wanted)

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Date:	Tue, 22 May 2007 10:25:01 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>
Subject: Re: [RFC PATCH] /sys/block -> /sys/class/block  (Fedora 3 & 4
 testers wanted)

On Mon, 21 May 2007 16:53:53 -0700,
Greg KH <greg@...ah.com> wrote:

> So, could anyone still running the crufty and unsupported Fedora 3 and 4
> releases test this patch out and let us know if it boots your machine or
> not?  I don't want to break legacy distros if we can possibly help it.
> 
> This has been successfully tested on both SuSE and Gentoo boxes, so
> we do hope this works for others.

Unfortunately, it doesn't :(

I tried this on one of our internal drivers, which is based on FC 3 (or
4, can look this up). With s390 defconfig, it is unable to open the
root device /dev/dasda1 (which is unsurprising, considering udev (063)
decided to create /dev/dasda(1) as a character node instead of a block
node). The only udev rule I found which could affect the dasd device
nodes is

SUBSYSTEM=="block",             GROUP="disk", MODE="0640"

When I look at the system, /sys/block/ and /sys/class/block/ look sane
at first glance (working on a 3270 console is usally PITA...)

Even more surprisingly, the system comes up fine (once I added ptmx to
makedev.d/) with CONFIG_SYSFS_DEPRECATED not set. /sys/block/
and /sys/class/block/ look just like expected. (Unfortunately, our
lsdasd tool breaks with this...)

I'll see if I can find out more.
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