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

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Date:	Tue, 13 Mar 2012 05:37:20 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	viro@...IV.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, hch@...radead.org,
	Trond.Myklebust@...app.com, sfrench@...ba.org, sage@...dream.net,
	ericvh@...il.com, mszeredi@...e.cz
Subject: Re: [PATCH 06/25] vfs: add i_op->atomic_create()

On Wed, Mar 07, 2012 at 10:22:23PM +0100, Miklos Szeredi wrote:
> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> Add a new inode operation which is called on regular file create.  This is a
> replacement for ->create() which allows the file to be opened atomically with
> creation.
> 
> This function is also called for non-open creates (mknod(2)) with a NULL file
> argument.  Only one of ->create or ->atomic_create will be called, implementing
> both makes no sense.
> 
> The functionality of this method partially overlaps that of ->atomic_open().
> FUSE and 9P only use ->atomic_create, NFS, CIFS and CEPH use both.

I really don't like the special casing of the mknod handling in every
atomic_create instance.  Either we should keep ->create for it, or do a
cleanup pass before to always make that pass go through ->mknod - in
fact most filesystems handle the two in common code anyway so we might
be able to get rid of one of them, possible mkdir as well.
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