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

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Date:	Mon, 30 Mar 2009 22:01:16 +0900
From:	Fernando Luis Vázquez Cao <flvazquez@...go.es>
To:	Chris Mason <chris.mason@...cle.com>
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

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?

Bartlomiej, I have just noticed that I happened to be working on
patches for reiserfs and xfs similar to the ones you sent earlier
this week. I picked some bits from your submission so I took the
liberty to add your signed-off to my patches. Could you take a
look at them and let me know if you are confortable with that?

Latest patches: http://lkml.org/lkml/2009/3/30/100
Beginning of the sub-thread: http://lkml.org/lkml/2009/3/29/28

Best regards,

Fernando
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