linux-kernel - Re: [PATCH 21/25] gfs2: use i_op->atomic

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Message-ID: <CAJfpegu3GZSp+sXCird+oo58+yWO4daAOQ_9sSL1Q_mctxEybA@mail.gmail.com>
Date:	Sat, 24 Mar 2012 16:38:33 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Trond.Myklebust@...app.com,
	sfrench@...ba.org, sage@...dream.net, ericvh@...il.com,
	mszeredi@...e.cz
Subject: Re: [PATCH 21/25] gfs2: use i_op->atomic_create()

On Sat, Mar 24, 2012 at 3:27 PM, Christoph Hellwig <hch@...radead.org> wrote:
> On Wed, Mar 07, 2012 at 10:22:38PM +0100, Miklos Szeredi wrote:
>> From: Miklos Szeredi <mszeredi@...e.cz>
>>
>> GFS2 doesn't open the file in ->create, but it does check the LOOKUP_EXCL flag
>> in it's create function.  Convert to using ->atomic_create and checking O_EXCL
>> so that the nameidata argument is no longer necessary.
>
> It seems odd that we require implementing ->atomic_create even if we
> don't actually do an atomic create but just want to look at the flags.
>
> In fact I wonder if we really need to bother with having ->atomic_create
> and ->create, or if we should have one method (kinda contra my previous
> stance that ->atomic_open and ->atomic_create should be one).
>
> This method then could or could not return a file pointer, but it would
> always be the entry point for creates.

Yes, except I thought of the pain of converting all those returns to
ERR_PTR and left the old ->create instead.

Maybe I should just byte the bullet or do that, having a single return
point for those functions shouldn't be that difficult to do.

Thanks,
Miklos
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