linux-kernel - vfs-scale, d_revalidate from nfsd

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Message-ID: <8855.1294927436@jrobl>
Date:	Thu, 13 Jan 2011 23:03:56 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	Nick Piggin <npiggin@...il.com>
Cc:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: vfs-scale, d_revalidate from nfsd


NFSD calls filesystem's ->d_revalidate() with the parameter nd == NULL.
So every
	if (nd->flags & LOOKUP_RCU)
		return -ECHILD;
code which was added to ->d_revalidate() of FS which supports NFS
exporting will crash.

If we rewrite it as
	if (nd && (nd->flags & LOOKUP_RCU))
		return -ECHILD;
the problem may not occur.
But I am not sure whether lookup_one_len() call in NFSD support rcu-walk.


J. R. Okajima
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