linux-kernel - Re: still nfs problems [Was: Linux 2.6.37-rc8]

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Date:	Wed, 5 Jan 2011 10:38:29 -0500
From:	Jim Rees <rees@...ch.edu>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
Cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-nfs@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Marc Kleine-Budde <m.kleine-budde@...gutronix.de>
Subject: Re: still nfs problems [Was: Linux 2.6.37-rc8]

Marc Kleine-Budde wrote:

  > Trond sent a fix to the nfs list on 27 Nov for "fileid changed" but I don't
  > know if this is the same bug you're seeing.  The patch was to
  > nfs_same_file() and I can send it if you want.  As far as I know the patch
  > made it upstream.
  
  Are you sure it's in .37?

...

  Would you please be so kind and send the patch to this thread?

This is the commit I'm thinking of:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=37a09f07459753e7c98d4e21f1c61e8756923f81

NFS: Fix a readdirplus bug

When comparing filehandles in the helper nfs_same_file(), we should not be
using 'strncmp()': filehandles are not null terminated strings.

Instead, we should just use the existing helper nfs_compare_fh().

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
---

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 8ea4a41..f0a384e 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -395,13 +395,9 @@ int xdr_decode(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, struct x
 static
 int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry)
 {
-	struct nfs_inode *node;
 	if (dentry->d_inode == NULL)
 		goto different;
-	node = NFS_I(dentry->d_inode);
-	if (node->fh.size != entry->fh->size)
-		goto different;
-	if (strncmp(node->fh.data, entry->fh->data, node->fh.size) != 0)
+	if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0)
 		goto different;
 	return 1;
 different:
--
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