linux-kernel - Re: [PATCH 02/11] 9p: fix dentry leak in v9fs_vfs_atomic_open

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Message-ID: <20130916181938.GD13318@ZenIV.linux.org.uk>
Date:	Mon, 16 Sep 2013 19:19:38 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	mszeredi@...e.cz, Eric Van Hensbergen <ericvh@...il.com>,
	"M. Mohan Kumar" <mohan@...ibm.com>, stable@...r.kernel.org
Subject: Re: [PATCH 02/11] 9p: fix dentry leak in v9fs_vfs_atomic_open_dotl()

On Mon, Sep 16, 2013 at 02:51:56PM +0200, Miklos Szeredi wrote:
> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> commit b6f4bee02f "fs/9p: Fix atomic_open" fixed the O_EXCL behavior, but
> results in a dentry leak if v9fs_vfs_lookup() returns non-NULL.

Frankly, I would prefer to deal with that in fs/namei.c:atomic_open()
instead.  I.e. let it call finish_no_open() as it used to do and
turn
                if (create_error && dentry->d_inode == NULL) {
                        error = create_error;
                        goto out;
                }
in fs/namei.c:atomic_open() into
		if (!dentry->d_inode) {
			if (create_error) {
				error = create_error;
				goto out;
			}
		} else if ((open_flag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
			error = -EEXIST;
			goto out;
		}

rather than try to deal with that crap in each instance of ->atomic_open()...
Objections?
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