linux-kernel - Re: adding proper O_SYNC/O_DSYNC, was Re: O

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Message-ID: <20090828161745.GA8755@infradead.org>
Date:	Fri, 28 Aug 2009 12:17:45 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Ulrich Drepper <drepper@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jamie Lokier <jamie@...reable.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: adding proper O_SYNC/O_DSYNC, was Re: O_DIRECT and barriers

On Fri, Aug 28, 2009 at 09:06:35AM -0700, Ulrich Drepper wrote:
> On 08/28/2009 08:46 AM, Christoph Hellwig wrote:
>>   - given that our current O_SYNC really is and always has been actuall
>>     Posix O_DSYNC
>
> If this is true, then this proposal would work, yes.

I'll put it on my todo list.  While reading through the Posix specs
I came up with some questions that you might be able to answer:

 - O_RSYNC basically means we need to commit atime updates before a
   read returns, right?  It would be easy to implement 
   it in a slightly suboptimal fashion, but is there any point?

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