On Fri, 2009-04-24 at 05:26 -0400, Rince wrote:
> Applied try 3 of Nick Piggin's patch to 2.6.30-rc3 (cleanly, no less!)
>
> Doesn't appear to have helped at all - I received my favorite BUG ON
> write.c:252 just like always, within 24 hours of booting the kernel,
> even.
Can you apply the following incremental patch on top of Nick's. This
appears to suffice to close the race on my setup.
Cheers
Trond
---------------------------------------------------------------------
>From f0258852dcb43c748854d2ee550c9c270bb25f21 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Date: Fri, 24 Apr 2009 17:32:22 -0400
Subject: [PATCH] NFS: Close page_mkwrite() races
Follow up to Nick Piggin's patches to ensure that nfs_vm_page_mkwrite
returns with the page lock held, and sets the VM_FAULT_LOCKED flag.
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
---
fs/nfs/file.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 5a97bcf..ec7e27d 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -517,10 +517,10 @@ static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
ret = nfs_updatepage(filp, page, 0, pagelen);
out_unlock:
+ if (!ret)
+ return VM_FAULT_LOCKED;
unlock_page(page);
- if (ret)
- ret = VM_FAULT_SIGBUS;
- return ret;
+ return VM_FAULT_SIGBUS;
}
static struct vm_operations_struct nfs_file_vm_ops = {
--
1.6.0.6
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