From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [RFC] relaxed barrier semantics
Date: Sat, 31 Jul 2010 11:12:46 +0200
Message-ID: <20100731091245.GA4643@lst.de>
References: <4C51DCF1.3010507@redhat.com> <25F5E16E-968D-4FEF-8187-70453985B19B@dilger.ca> <20100729230406.GI4506@thunk.org> <4C52CBFF.6090406@vlnb.net> <20100730130957.GA26894@lst.de> <4C52D2E0.5000609@vlnb.net> <20100730133410.GA27996@lst.de> <4C52D728.6070008@vlnb.net> <20100730142025.GA29341@lst.de> <20100731004756.GC3273@quack.suse.cz>
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Cc: Christoph Hellwig <hch@lst.de>,
	Vladislav Bolkhovitin <vst@vlnb.net>,
	"Ted Ts'o" <tytso@mit.edu>, Andreas Dilger <adilger@dilger.ca>,
	Ric Wheeler <rwheeler@redhat.com>, Tejun Heo <tj@kernel.org>,
	Vivek Goyal <vgoyal@redhat.com>, jaxboe@fusionio.com,
	James.Bottomley@suse.de, linux-fsdevel@vger.kernel.org,
	linux-scsi@vger.kernel.org, chris.mason@oracle.com,
	swhiteho@redhat.com, konishi.ryusuke@lab.ntt.co.jp
To: Jan Kara <jack@suse.cz>
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On Sat, Jul 31, 2010 at 02:47:57AM +0200, Jan Kara wrote:
> > There is a few caes where we could do that - the fsync without metadata
> > changes above would be the prime example.  But there's a lot lower
> > hanging fruit until we get to the point where it's worth trying.
>   Umm, I don't understand you. I think that fsync in particular is an
> example where you have to wait and issue cache flush if the drive has
> volatile write cache.

Of course.  What makes you believe anyone said something else?