linux-kernel - RE: [PATCH 1/1] [SCSI] Fix a bug in deriving the FLUSH

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Date:	Fri, 18 Jul 2014 17:05:45 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	James Bottomley <jbottomley@...allels.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch@...radead.org" <hch@...radead.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"michaelc@...wisc.edu" <michaelc@...wisc.edu>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"jasowang@...hat.com" <jasowang@...hat.com>
Subject: RE: [PATCH 1/1] [SCSI] Fix a bug in deriving the FLUSH_TIMEOUT from
 the basic I/O timeout



> -----Original Message-----
> From: James Bottomley [mailto:jbottomley@...allels.com]
> Sent: Friday, July 18, 2014 9:57 AM
> To: KY Srinivasan
> Cc: linux-kernel@...r.kernel.org; hch@...radead.org; apw@...onical.com;
> devel@...uxdriverproject.org; michaelc@...wisc.edu; axboe@...nel.dk;
> linux-scsi@...r.kernel.org; ohering@...e.com;
> gregkh@...uxfoundation.org; jasowang@...hat.com
> Subject: Re: [PATCH 1/1] [SCSI] Fix a bug in deriving the FLUSH_TIMEOUT
> from the basic I/O timeout
> 
> On Fri, 2014-07-18 at 16:44 +0000, KY Srinivasan wrote:
> >
> > > -----Original Message-----
> > > From: Christoph Hellwig (hch@...radead.org)
> > > [mailto:hch@...radead.org]
> > > Sent: Friday, July 18, 2014 8:11 AM
> > > To: KY Srinivasan
> > > Cc: Jens Axboe; James Bottomley; michaelc@...wisc.edu; Christoph
> > > Hellwig (hch@...radead.org); linux-scsi@...r.kernel.org;
> > > gregkh@...uxfoundation.org; jasowang@...hat.com; linux-
> > > kernel@...r.kernel.org; ohering@...e.com; apw@...onical.com;
> > > devel@...uxdriverproject.org
> > > Subject: Re: [PATCH 1/1] [SCSI] Fix a bug in deriving the
> > > FLUSH_TIMEOUT from the basic I/O timeout
> > >
> > > On Thu, Jul 17, 2014 at 11:53:33PM +0000, KY Srinivasan wrote:
> > > > I still see this problem. There was talk of fixing it elsewhere.
> > >
> > > Well, what we have right not is entirely broken, given that the
> > > block layer doesn't initialize ->timeout on TYPE_FS requeuests.
> > >
> > > We either need to revert that initial commit or apply something like
> > > the attached patch as a quick fix.
> > I had sent this exact patch sometime back:
> >
> > http://www.spinics.net/lists/linux-scsi/msg75385.html
> 
> Actually, no you didn't.  The difference is in the derivation of the timeout.
> Christoph's patch is absolute in terms of SD_TIMEOUT; yours is relative to the
> queue timeout setting ... I thought there was a reason for preferring the
> relative version.

You are right; sorry about that. I think my version is better since we do want to base the
flush timeout relative to the basic timeout.

K. Y
> 
> James

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