linux-kernel - Re: [PATCH 8/9] vfs: split __lookup

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Date:	Mon, 26 Mar 2012 12:44:56 +0200
From:	Miklos Szeredi <mszeredi@...e.cz>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Miklos Szeredi <miklos@...redi.hu>, viro@...IV.linux.org.uk,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/9] vfs: split __lookup_hash

On Tue, 2012-03-20 at 12:39 -0400, Christoph Hellwig wrote:
> On Tue, Mar 06, 2012 at 01:56:40PM +0100, Miklos Szeredi wrote:
> > From: Miklos Szeredi <mszeredi@...e.cz>
> > 
> > Split __lookup_hash into two component functions:
> > 
> >  lookup_dcache - tries cached lookup, returns whether real lookup is needed
> >  lookup_real - calls i_op->lookup
> > 
> > This eliminates code duplication between d_alloc_and_lookup() and
> > d_inode_lookup().
> 
> The return value from lookup_dcache is a bit confusing.  What about
> returning the need_lookup flag, and passing the dentry as a parameter,
> that way the callers would do the more obvious:
> 
> 	if (lookup_dcache(name, base, nd, &dentry))
> 		return dentry;
> 
> instead of having to check two conditions.
> 

The reason I dislike your version is that returning an error value in an
argument would be strange.

And this works too:

	dentry = lookup_dcache(name, base, nd, &need_lookup);
	if (!need_lookup)
		return dentry;


Thanks,
Miklos

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