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

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Date:	Tue, 22 May 2007 18:28:12 +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 Tue, 22 May 2007 10:25:01 +0200,
Cornelia Huck <cornelia.huck@...ibm.com> wrote:

> 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).

Just to be clear, it's fsck that complains:

Checking filesystems  
Checking all file systems.  
[/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a /dev/dasda1   
fsck.ext3: No such device or address while trying to open /dev/dasda1   
Possibly non-existent or swap device?  
[FAILED]   

(so that is after udev has been started and obviously dasda1 could be
accessed)

> 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.

I currently have the inkling that

lrwxrwxrwx  1 root root    0 May 22 15:59 block:dasda1-> ../../../class/block/dasda1

in /sys/block/dasda/ is the culprit. In all other versions I've tried
(without CONFIG_SYSFS_DEPRECATED, and on an older kernel with and
without CONFIG_SYSFS_DEPRECATED), it's always dasda1.

I can continue investigating tomorrow, unless someone has a good idea :)
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