linux-kernel - Re: [PATCH 1/1] FS: Add generic data flush to fsync

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Message-ID: <20140414072242.GE7860@infradead.org>
Date:	Mon, 14 Apr 2014 00:22:42 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Fabian Frederick <fabf@...net.be>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Viro <viro@...iv.linux.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	jack <jack@...e.cz>, akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/1] FS: Add generic data flush to fsync

On Fri, Apr 11, 2014 at 11:05:30PM +0200, Fabian Frederick wrote:
> Ok, that would mean 'older' filesystems -without barrier flag-
> to call generic_file_fsync would result in a flush but ext4 without journal 
> also calls it ; maybe with nobarrier and I'm not sure it's the only case.
> How can I deal with this problem ?

I don't really think not implementing the barrier option is a problem.
For ext4 if you want consistency either opencode generic_file_fsync
there and add the check, or add a __generic_file_fsync that doesn't
do the flush.
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