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

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Message-ID: <20090330142518.GI13356@mit.edu>
Date:	Mon, 30 Mar 2009 10:25:18 -0400
From:	Theodore Tso <tytso@....edu>
To:	Fernando Luis Vázquez Cao <flvazquez@...go.es>
Cc:	Chris Mason <chris.mason@...cle.com>,
	Eric Sandeen <sandeen@...hat.com>,
	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, Mar 30, 2009 at 10:01:16PM +0900, Fernando Luis Vázquez Cao wrote:
>
> 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?

Fernando, see my comments on those patches.  We don't need to issue a
barrier after a call to sync_inode() or ext[34]_force_commit(), since
those functions will issue a barrier for us.  It would probably be a
good idea to use blktrace to test and make sure that we have one and
exactly one barrier op issued for each fsync().

						- Ted

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