linux-kernel - Re: vfs-scale, nd->inode after __do_follow

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Message-ID: <20110114052813.GZ19804@ZenIV.linux.org.uk>
Date:	Fri, 14 Jan 2011 05:28:13 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Nick Piggin <npiggin@...il.com>
Cc:	"J. R. Okajima" <hooanon05@...oo.co.jp>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: vfs-scale, nd->inode after __do_follow_link()

On Fri, Jan 14, 2011 at 03:09:10PM +1100, Nick Piggin wrote:

> > + ? ? ? ? ? ? ? ? ? ? ? struct dentry *i = path.dentry->d_inode;
> > + ? ? ? ? ? ? ? ? ? ? ? if (!IS_ERR(cookie) && i->i_op->put_link)
> > + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? i->i_op->put_link(path.dentry, &nd, cookie);
> > ? ? ? ? ? ? ? ? ? ? ? ?/* nd.path had been dropped */
> > ? ? ? ? ? ? ? ? ? ? ? ?nd.path = path;
> > ? ? ? ? ? ? ? ? ? ? ? ?goto out_path;
> 
> It should be the inode we followed, rather than the inode of the
> new path, I think.

And that's what the first argument of __do_follow_link() is.  I'm actually
tempted to rename it from path to symlink and make it const to clarify
the things a bit.

BTW, "i" as a name for local struct inode * is -><- that close to being a
shootable offense.  Please, rename to e.g. struct inode *link (and it's
struct inode, not struct dentry).
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