linux-kernel - Re: [patch 5/6] vfs: optimization to /proc/<pid>/mountinfo patch

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Message-ID: <20080319115640.GL10722@ZenIV.linux.org.uk>
Date:	Wed, 19 Mar 2008 11:56:40 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	akpm@...ux-foundation.org, linuxram@...ibm.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 5/6] vfs: optimization to /proc/<pid>/mountinfo patch

On Thu, Mar 13, 2008 at 10:26:46PM +0100, Miklos Szeredi wrote:
> +static int prepend(char **buffer, int *buflen, const char *str,
> +			  int namelen)

inline, please.

> @@ -1911,10 +1902,9 @@ char *dentry_path(struct dentry *dentry,
>  
>  	spin_lock(&dcache_lock);
>  	prepend(&end, &buflen, "\0", 1);
> -	if (!IS_ROOT(dentry) && d_unhashed(dentry)) {
> -		if (prepend(&end, &buflen, "//deleted", 9))
> +	if (!IS_ROOT(dentry) && d_unhashed(dentry) &&
> +		(prepend(&end, &buflen, " (deleted)", 10) != 0))
>  			goto Elong;

That's a bad idea:
	* we bloody well might want to use it outside of procfs
	* //deleted is _better_; you can't have an empty path component,
but you can have a pathname ending on " (deleted)".

> +#ifdef CONFIG_PROC_FS
>  /*
>   * returns the path of the 'dentry' from the root of its filesystem.
>   */
> @@ -411,7 +412,7 @@ int seq_dentry(struct seq_file *m, struc
>  	m->count = m->size;
>  	return -1;
>  }
> -EXPORT_SYMBOL(seq_dentry);
> +#endif /* CONFIG_PROC_FS */

Same comment; you don't need procfs to use seq_file.
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