linux-kernel - Re: bus errors on nfs writes in latest git

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Date:	Sat, 04 Apr 2009 12:27:50 -0400
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	linux-nfs@...r.kernel.org, Nick Piggin <npiggin@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: bus errors on nfs writes in latest git

On Sat, 2009-04-04 at 12:19 -0400, Trond Myklebust wrote:
> On Sat, 2009-04-04 at 12:14 -0400, J. Bruce Fields wrote:
> > My regular connecthon tests are reporting bus errors on the "write/read
> > 30 MB file" on recent upstream kernels.  I'm travelling and haven't had
> > a chance to do anything beyond kick off a dumb git-bisect, which pointed
> > the blame at the following commit.  Any ideas?

The following patch should fix it.

Cheers
 Trond
---------------------------------------------------------------
>>From b7a178f4fab331821b8cff384e1954e62aa63e52 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@...app.com>
Date: Sat, 4 Apr 2009 12:22:57 -0400
Subject: [PATCH] NFS: Fix the return value in nfs_page_mkwrite()

Commit c2ec175c39f62949438354f603f4aa170846aabb (mm: page_mkwrite change
prototype to match fault) exposed a bug in the NFS implementation of
page_mkwrite. We should be returning 0 on success...

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
---
 fs/nfs/file.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 3523b89..5a97bcf 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -516,8 +516,6 @@ static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 		goto out_unlock;
 
 	ret = nfs_updatepage(filp, page, 0, pagelen);
-	if (ret == 0)
-		ret = pagelen;
 out_unlock:
 	unlock_page(page);
 	if (ret)
-- 
1.6.0.4


-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com
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