linux-ext4 - Re: [PATCH 1/3] block: Create sysfs knobs to override FLUSH/FUA support flags

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Message-ID: <20110126093051.GA12520@htj.dyndns.org>
Date:	Wed, 26 Jan 2011 10:30:51 +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 1/3] block: Create sysfs knobs to override FLUSH/FUA
 support flags

On Tue, Jan 25, 2011 at 11:16:26PM -0800, Darrick J. Wong wrote:
> This patch is the first in a series to refactor the barrier= mount options out
> of the filesystem code.  This patch adds sysfs knobs to disable flush and FUA;
> of course, the automatic default is the safe choice, i.e. to leave them
> enabled.  Obviously, only a seasoned administrator should ever be overriding
> the defaults.

Hmmm... wouldn't it be better to just export flush and fua instead of
ignore_*?  So that the admin can turn things on and off as [s]he seems
fit?  Also, it might be better to export them in a single attribute,
say cache_control or something.  Only subset of the combinations make
sense anyway - none, flush, flush_fua.

Thanks.

-- 
tejun
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