linux-kernel - Re: broken dpt_i2o in 2.6.23 (was: ext2_check

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Message-Id: <20071130021226T.tomof@acm.org>
Date:	Fri, 30 Nov 2007 02:09:52 +0900
From:	FUJITA Tomonori <tomof@....org>
To:	anders.henke@...d1.de
Cc:	tomof@....org, jack@....cz, fujita.tomonori@....ntt.co.jp,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: broken dpt_i2o in 2.6.23 (was: ext2_check_page: bad entry in
 directory) (fwd)

On Thu, 29 Nov 2007 17:45:57 +0100
Anders Henke <anders.henke@...d1.de> wrote:

> On Nov 29 2007, FUJITA Tomonori wrote:
> > On Thu, 29 Nov 2007 14:03:19 +0100
> > Jan Kara <jack@....cz> wrote:
> > 
> > >   Adding relevant people and lists to CC...
> > > 
> > > 									Honza
> > > 
> > > ----- Forwarded message from Anders Henke <anders.henke@...d1.de> -----
> > > 
> > > Date:	Thu, 29 Nov 2007 13:31:50 +0100
> > > From: Anders Henke <anders.henke@...d1.de>
> > > To: linux-kernel@...r.kernel.org
> > > Subject: Re: broken dpt_i2o in 2.6.23 (was: ext2_check_page: bad entry in directory)
> > > User-Agent: Mutt/1.5.13 (2006-08-11)
> > > 
> > > On November 28 2007, Anders Henke wrote:
> > > > As "everything is reported as being zero" is quite odd an Jan took a
> > > > guess that it might be block-layer or driver-related, I've assumed
> > > > that the driver is responsible for this; just out of the curiousity, 
> > > > I've manually replaced the dpt_i2o driver by the 2.6.19 one by copying 
> > > > driver/scsi/dpt_i2o.c driver/scsi/dpti.h and driver/scsi/dpt/ into a 
> > > > vanilla 2.6.23.1. kernel; using this kernel fixed the issue for me.
> > > > 
> > > > I haven't yet fine-tested from which kernel release on the dpt_i2o driver 
> > > > behaves like this and spews out zeroed blocks when trying to mount
> > > > the rootfs. Maybe this is just some timing issue.
> > > 
> > > I've started the fine-tests and can say so far that dpt_i2o from 
> > > 2.6.22 is still fine. Test is simple:
> > > 
> > > anders@...a:/usr/src/linux-2.6.22/drivers/scsi/dpt$ cp -r dpt/ dpt_i2o.c dpti.h /usr/src/linux-2.6.23.1/drivers/scsi/
> > > 
> > > ... recompile the kernel, reboot: works.
> > > 
> > > 2.6.22 and 2.6.23 differ in terms of the dpt_i2o driver by two different
> > > patch sets:
> > > -one 2 Kb small set of patches from 2.6.22 to 2.6.22-rc1
> > > -one 7 Kb set of patches from 2.6.23-rc2 to 2.6.23-rc3
> > > -one 162 Kb set of patches from 2.6.23-rc9 to 2.6.23-rc10.
> > > 
> > > When applying the 2.6.23-rc1-based driver to "my" 2.6.31.1 kernel,
> > > the "zero blocks"-symptom show up, so it's the "lucky" situation
> > > that the smallest patch actually seams to be the broken one.
> > > 
> > > According to the 2.6.23-rc1 short-form changelog, there is
> > > one major edit on the dpt_i2o driver:
> > > 
> > > FUJITA Tomonori 
> > > 
> > >       [SCSI] dpt_i2o: convert to use the data buffer accessors
> > > 
> > > Stephen Rothwell 
> > >       dpt_i2o depends on virt_to_bus
> > > 
> > > Fujita, would you please take a look at this?
> > 
> > Sorry about the bug. Can you try this?
> > 
> > 
> > diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
> > index 8258506..1255b26 100644
> > --- a/drivers/scsi/dpt_i2o.c
> > +++ b/drivers/scsi/dpt_i2o.c
> > @@ -3295,7 +3295,7 @@ static struct scsi_host_template adpt_template = {
> >  	.this_id		= 7,
> >  	.cmd_per_lun		= 1,
> >  	.use_clustering		= ENABLE_CLUSTERING,
> > -	.use_sg_chaining	= ENABLE_SG_CHAINING,
> > +	.use_sg_chaining	= DISABLE_SG_CHAINING,
> >  };
> >  
> >  static s32 adpt_scsi_register(adpt_hba* pHba)
> 
> The structure to patch does look different and doesn't include an
> tag "use_sg_chaining":

Sorry, I misread your bug report. If you use 2.6.23, the sg chaining
is unrelated.

What architecture do you use?
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