linux-kernel - Re: 2.6.34-rc3-git6: Reported regressions from 2.6.33

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Date:	Wed, 7 Apr 2010 23:19:41 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	Linux PM List <linux-pm@...ts.linux-foundation.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>,
	DRI <dri-devel@...ts.sourceforge.net>
Subject: Re: 2.6.34-rc3-git6: Reported regressions from 2.6.33

On Wed, Apr 07, 2010 at 03:04:46PM -0700, Linus Torvalds wrote:

> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=15674
> > Subject		: [2.6.34-rc2 NFS4 oops] open error path failure...
> > Submitter	: Daniel J Blueman <daniel.blueman@...il.com>
> > Date		: 2010-03-29 18:36 (10 days old)
> > Message-ID	: <6278d2221003291136p6481fe8emfb039403343c082@...l.gmail.com>
> > References	: http://marc.info/?l=linux-kernel&m=126988782722711&w=2
> 
> This smells like the same LOOKUP_DIRECTORY thing as the first entry, but.. 

No, it's not the same thing; the fix is to have nfs ->d_revalidate()
return an error on failing open attempt (in insane codepath that has
->d_revalidate() handling open()).  Confirmed to work by reporter...

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index d79a7b3..fe0cd9e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2068,8 +2068,7 @@ nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, st
 			case -EDQUOT:
 			case -ENOSPC:
 			case -EROFS:
-				lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
-				return 1;
+				return PTR_ERR(state);
 			default:
 				goto out_drop;
 		}
--
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