linux-kernel - Re: Approaches to making io

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Message-ID: <20110901165718.GG758@samba2>
Date:	Thu, 1 Sep 2011 09:57:18 -0700
From:	Jeremy Allison <jra@...ba.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Jeremy Allison <jra@...ba.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 12:45:54PM -0400, Christoph Hellwig wrote:
> On Thu, Sep 01, 2011 at 09:34:52AM -0700, Jeremy Allison wrote:
> > > 
> > > (to match the naming of something like O_CLOEXEC) and be available to set
> > > with F_SETFD via an fcntl and dup3 call ?
> > 
> > Ah, looking at fcntl - do you want to set/get this via F_SETFD/F_GETFD,
> > or via F_SETFL/F_GETFL ? i.e. is this a file descritor flag, or a status
> > flag ? I'd guess a file descriptor flag but I'm not sure of the difference
> > here..
> 
> F_SETFD/F_GETFD operates on an entry in the fd table, e.g. separately
> if you have duped fds.  That's exactly what we do _not_ want here.

Ah, ok - I understand the difference now. So it's a status flag
get/set with F_SETFL/F_GETFL.

Ok, that works for me. Get me a patch in the kernel and I'll code
up the Samba changes very shortly (actually should be quite
easy :-).

Jeremy.
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