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

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Message-ID: <20090417224350.GN26366@ZenIV.linux.org.uk>
Date:	Fri, 17 Apr 2009 23:43:50 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	hooanon05@...oo.co.jp, hch@...radead.org,
	"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

On Fri, Apr 17, 2009 at 11:17:00PM +0100, David Woodhouse wrote:
> It sounds like the better answer is to just make sure i_mutex is held
> when nfsd_buffered_readdir() calls back into the provided filldir
> function (we could do it in the various filldir functions themselves,
> _if_ they call lookup_one_len(), but I think I prefer it this way --
> it's simpler). Patch below for comment.

Umm...  I can live with that, assuming that we don't have callbacks
that take i_mutex themselves.  AFAICS, everything we call there is
either obviously not touching i_mutex or is already called while we
hold i_mutex elsewhere, but I'd appreciate if somebody actually
tested that sucker for different versions of protocol...

> (While I'm staring at it, it looks like nfsd_buffered_readdir() should
> be returning a __be32 not an int, and its 'return -ENOMEM' should be
> 'return nfserrno(-ENOMEM)'. The first bug I inherited from the existing
> nfsd_do_readdir() when I replaced it, but the second is all my own. I'll
> send a patch to fix those shortly.)

Fold it into this one, please.
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