linux-kernel - Re: [PATCH 06/25] vfs: add i_op->atomic

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Message-ID: <Pine.LNX.4.64.1203130932420.10527@cobra.newdream.net>
Date:	Tue, 13 Mar 2012 09:34:53 -0700 (PDT)
From:	Sage Weil <sage@...dream.net>
To:	Miklos Szeredi <miklos@...redi.hu>
cc:	Christoph Hellwig <hch@...radead.org>, viro@...IV.linux.org.uk,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Trond.Myklebust@...app.com, sfrench@...ba.org, ericvh@...il.com
Subject: Re: [PATCH 06/25] vfs: add i_op->atomic_create()

On Tue, 13 Mar 2012, Miklos Szeredi wrote:
> Miklos Szeredi <miklos@...redi.hu> writes:
> 
> > Christoph Hellwig <hch@...radead.org> writes:
> >
> >> On Tue, Mar 13, 2012 at 12:22:10PM +0100, Miklos Szeredi wrote:
> >>> Good point.  Yes, ->create is probably worth getting rid of.  Mkdir, I'm
> >>> not so sure, but I'll look at what filesystems are doing.
> >>
> >> Btw, is there any good reason to keep ->atomic_open and ->atomic_create
> >> separate?  It seems like the instances in general share code anyway.
> >
> > ->atomic_open is called before lookup, ->atomic_create after lookup.
> >
> > How would we differentiate between the two if they were common?  We
> > could have a filesystem flag, but for example CEPH does weird things
> > like using ->atomic_open for !O_CREAT and ->atomic_create for O_CREAT.

Don't let what Ceph used to do distract you; I only got certain intent 
cases to work and didn't bother with the others.

> Or let the filesystem do the lookup in ->atomic_open if it wants (and
> pass the need_lookup flag to the filesystem).

Either way is fine from my perspective.

sage
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