linux-ext4 - Re: [PATCH 3/3] ext4: Deprecate barrier= and nobarrier mount options

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Date:	Wed, 26 Jan 2011 10:36:32 +0100
From:	Tejun Heo <tj@...nel.org>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, axboe@...nel.dk, tytso@....edu,
	shli@...nel.org, neilb@...e.de, adilger.kernel@...ger.ca,
	jack@...e.cz, snitzer@...hat.com, linux-kernel@...r.kernel.org,
	kmannth@...ibm.com, cmm@...ibm.com, linux-ext4@...r.kernel.org,
	rwheeler@...hat.com, hch@....de, josef@...hat.com
Subject: Re: [PATCH 3/3] ext4: Deprecate barrier= and nobarrier mount
 options

Hello,

On Tue, Jan 25, 2011 at 11:23:29PM -0800, Darrick J. Wong wrote:
> As part of migrating the FLUSH/FUA knob to the block layer, remove the support
> code for the barrier-related mount options and remove the conditionals around
> flushes in favor of always issuing the flush.  The block layer will handle
> gracefully the situation where a FLUSH or FUA request is issued to a device
> that doesn't support it.  Modify the option parsing code to print a warning if
> someone tries to use the old mount option.
> 
> Note: The nobarrier bit in the default mount flags is now useless.

The option is something which users are already quite familiar with.
I think we'll just have to carry this around.  What we can do, tho, is
moving the actual control mechanism to block layer -
ie. blkdev_skip_flush() or something like that which ignores flush
requests for the current exclusive opener.

Thanks.

-- 
tejun
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