linux-kernel - Re: [PATCH] driver core: remove CONFIG_SYSFS

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Date:	Thu, 15 Jul 2010 12:24:33 -0400
From:	Douglas Gilbert <dgilbert@...erlog.com>
To:	Konrad Rzeszutek Wilk <konrad@...nel.org>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	alsa-devel@...a-project.org, Jens Axboe <axboe@...nel.dk>,
	Stephen Hemminger <shemminger@...tta.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Alan Stern <stern@...land.harvard.edu>,
	"James E.J. Bottomley" <James.Bottomley@...e.de>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Tejun Heo <tj@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Howells <dhowells@...hat.com>,
	Dave Airlie <airlied@...il.com>
Subject: Re: [PATCH] driver core: remove CONFIG_SYSFS_DEPRECATED

On 10-07-15 09:29 AM, Konrad Rzeszutek Wilk wrote:
>
>>> and the box still won't boot.
>>
>> The reason FC6 doesn't boot is there is a userspace tool
>> I believe in the initrd that cares about symlinks when it should
>> not.
>
> It is not just nash. Also multipathd would fail (as it expects
> the /sys/scsi_host/..<something>  in certain directories), and 'lsscsi'. There
> might be other tools that depend on libsysfs to be affected by this as well.

lsscsi has been "CONFIG_SYSFS_DEPRECATED_V2" tolerant
since version 0.21 released 20080710. The current
version is 0.23 released 20091201 which will soon
be displaced by 0.24 to cope with the most recent
breakages.

Writing a user space tool that relies on sysfs structure
and contents, stable over the whole lk 2.6 series, is
impossible. For a history of my pain with lsscsi see
its ChangeLog.


Happily most of my tools are based on an ioctl! SG_IO
was a suggestion from Joerg Schilling and has now found
its way into most block devices. Now it has a new lease
of life in the bsg driver.

Doug Gilbert


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