linux-kernel - Re: [PATCH] ext4: fix blkdev_issue

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Message-Id: <1238419459.30488.42.camel@think.oraclecorp.com>
Date:	Mon, 30 Mar 2009 09:24:19 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Fernando Luis Vázquez Cao <flvazquez@...go.es>
Cc:	Eric Sandeen <sandeen@...hat.com>, Theodore Tso <tytso@....edu>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: fix blkdev_issue_flush() failure handling

On Mon, 2009-03-30 at 22:01 +0900, Fernando Luis Vázquez Cao wrote:
> Chris Mason wrote:
> > On Sun, 2009-03-29 at 22:22 -0500, Eric Sandeen wrote:
> >> Theodore Tso wrote:
> >>> On Sun, Mar 29, 2009 at 12:43:22PM -0500, Eric Sandeen wrote:
> >>>> As long as we keep the call there this is probably good, but after
> >>>> talking w/ Chris Mason, I think the call is extraneous anyway and should
> >>>> probably just be removed...
> >>>>
> >>> Yes, I agree, but it takes a lot of digging to be completely sure of
> >>> that it's safe to remove it.  Interestingly, it was you who added the
> >>> patch which added the call to blkdev_issue_flush():
> >>> commit d755fb384250d6bd7fd18a0930e71965acc8e72e
> >>> Author: Eric Sandeen <sandeen@...hat.com>
> >>> Date:   Fri Jul 11 19:27:31 2008 -0400
> >>
> >> Yes, it was.  Although I got the idea when hch pointed out that SuSE did
> >> this... thanks to Chris.  It's come full circle.  :)
> > 
> > Grin.  I'm not sure the I_DIRTY checks alone are enough to decide that a
> > commit is required though.  I think the inode could be clean but still
> > have metadata that needs commit.
> 
> Chris, I have just sent patches that attempt to fix both ext3 and
> ext4 while also adding a per-device sysfs knob tu disable
> write-flushes. A previous version of this patch set added a new
> generic mount option but comments from Christoph and others
> convinced me to turn it into a per-device tunable. Could you take
> a look at the patches?
> 

Jens' comment are right on I think.  If we get that fixed up we can get
rid of all the filesystem mount -o barrier=flush,0,1,xyz confusion and
set it via the block devices directly.

That would be nice ;)

-chris


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