netdev - Re: [PATCH v2 4/5] fs: Introduce SINGLE dentries for pipes, socket, anon fd

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Date:	Sat, 29 Nov 2008 11:38:36 +0100
From:	Jörn Engel <joern@...fs.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Christoph Hellwig <hch@...radead.org>,
	David Miller <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	"kernel-testers@...r.kernel.org >> Kernel Testers List" 
	<kernel-testers@...r.kernel.org>, Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [PATCH v2 4/5] fs: Introduce SINGLE dentries for pipes, socket, anon fd

On Sat, 29 November 2008 09:44:23 +0100, Eric Dumazet wrote:
>
> +struct dentry *d_alloc_single(const struct qstr *name, struct inode *inode)
> +{
> +	struct dentry *entry;
> +
> +	entry = d_alloc(NULL, name);
> +	if (entry) {
> +		entry->d_sb = inode->i_sb;
> +		entry->d_parent = entry;
> +		entry->d_flags |= DCACHE_SINGLE | DCACHE_DISCONNECTED;
> +		entry->d_inode = inode;
> +		fsnotify_d_instantiate(entry, inode);
> +		security_d_instantiate(entry, inode);
> +	}
> +	return entry;

Calling the struct dentry entry had me onfused a bit.  I believe
everyone else (including the code you removed) uses dentry.

> @@ -918,7 +906,7 @@ struct file *create_write_pipe(int flags)
>  	struct inode *inode;
>  	struct file *f;
>  	struct dentry *dentry;
> -	struct qstr name = { .name = "" };
> +	static const struct qstr name = { .name = "" };
>  
>  	err = -ENFILE;
>  	inode = get_pipe_inode();
...
> @@ -371,20 +358,13 @@ static int sock_alloc_fd(struct file **filep, int flags)
>  static int sock_attach_fd(struct socket *sock, struct file *file, int flags)
>  {
>  	struct dentry *dentry;
> -	struct qstr name = { .name = "" };
> +	static const struct qstr name = { .name = "" };

These two could even be combined.

And of course I realize that I comment on absolute trivialities.  On the
whole, I couldn't spot a real problem in your patches.

Jörn

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