linux-kernel - Re: Approaches to making io

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Message-ID: <20110901163435.GA7641@infradead.org>
Date:	Thu, 1 Sep 2011 12:34:35 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jeremy Allison <jra@...ba.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Ulrich Drepper <drepper@...adia.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Ehrenberg <dehrenberg@...gle.com>,
	Jens Axboe <axboe@...nel.dk>, Jeff Moyer <jmoyer@...hat.com>,
	linux-kernel@...r.kernel.org, linux-aio@...ck.org
Subject: Re: Approaches to making io_submit not block

On Thu, Sep 01, 2011 at 09:31:07AM -0700, Jeremy Allison wrote:
> > We'd define a new O_LOCKS_WHATEVER flag for it, which gets set either
> > using fcntl(..., F_SETFL, ...) or dup3.  All in all that should be less
> > than 50 lines of code in the kernel.
> 
> Ok, so it'd be set at open() time, say:
> 
> O_CLOLOCK_PERSIST
> 
> (to match the naming of something like O_CLOEXEC) and be available to set
> with F_SETFD via an fcntl and dup3 call ?

Yes, that's the idea.

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