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

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Date:	Tue, 31 Mar 2009 13:28:33 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	Chris Mason <chris.mason@...cle.com>
CC:	Fernando Luis Vázquez Cao 
	<flvazquez@...go.es>, 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 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 ;)

Thank you for your feedback, Chris! I will address some of the issues spotted
in the mailing list and resend the whole patch-set.

Regards,

Fernando
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