linux-kernel - Re: [GIT PULL] Please pull NFS client bugfixes....

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Date:	Thu, 07 Jan 2010 22:00:26 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Trond.Myklebust@...app.com
Cc:	linux-kernel@...r.kernel.org, torvalds@...l.org
Subject: Re: [GIT PULL] Please pull NFS client bugfixes....

> Hi Linus,
>
> Please pull from the "bugfixes" branch of the repository at
>
>    git pull git://git.linux-nfs.org/projects/trondmy/nfs-2.6.git bugfixes
>
> This will update the following files through the appended changesets.

How about the mmap lock order inversion patch?

That problem is still there and hits immediately after mounting root 
with a lockdep warning on any lockdep enabled NFS root kernel.

-Andi

---

NFS: don't revalidate in mmap

nfs_revalidate_mapping takes i_mutex, but mmap already has mmap_sem
hold and taking i_mutex inside mmap_sem is not allowed by the VFS.

So don't revalidate on mmap time and trust it has been already done.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/nfs/file.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

Index: linux-2.6.32-ak/fs/nfs/file.c
===================================================================
--- linux-2.6.32-ak.orig/fs/nfs/file.c
+++ linux-2.6.32-ak/fs/nfs/file.c
@@ -297,14 +297,9 @@ nfs_file_mmap(struct file * file, struct
 	dprintk("NFS: mmap(%s/%s)\n",
 		dentry->d_parent->d_name.name, dentry->d_name.name);

-	/* Note: generic_file_mmap() returns ENOSYS on nommu systems
-	 *       so we call that before revalidating the mapping
-	 */
 	status = generic_file_mmap(file, vma);
-	if (!status) {
+	if (!status)
 		vma->vm_ops = &nfs_file_vm_ops;
-		status = nfs_revalidate_mapping(inode, file->f_mapping);
-	}
 	return status;
 }

-- 
ak@...ux.intel.com -- Speaking for myself only.
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