linux-kernel - Re: Q: NFSD readdir in linux-2.6.28

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Message-ID: <8913.1237476890@jrobl>
Date:	Fri, 20 Mar 2009 00:34:50 +0900
From:	hooanon05@...oo.co.jp
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: Q: NFSD readdir in linux-2.6.28 


David Woodhouse:
> Yes, well spotted. It didn't matter when the buffered readdir() was
> purely internal to XFS, because it didn't matter there that we called
> ->lookup() without i_mutex set. But now we're exposing arbitrary file
> systems to it, we need to make sure we follow the locking rules. 
> 
> I _think_ it's sufficient to make the affected callers of
> lookup_one_len() lock the parent's i_mutex for themselves before calling
> it. I'll take a closer look...

If you remember why you discarded the FS_NO_LOOKUP_IN_READDIR flag
approach, please let me know. URL or something is enough.

Thanx
J. R. Okajima
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