linux-kernel - [ 05/95] fix page number calculation bug for block layout decode buffer

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Date:	Sun, 09 Sep 2012 23:41:55 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Jim Rees <rees@...ch.edu>,
	Andy Adamson <andros@...app.com>,
	Fred Isaman <iisaman@...app.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>
Subject: [ 05/95] fix page number calculation bug for block layout decode buffer

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jim Rees <rees@...ch.edu>

commit 10bd295a0b6488ebe634b72a11d8986bd3af3819 upstream.

Signed-off-by: Jim Rees <rees@...ch.edu>
Suggested-by: Andy Adamson <andros@...app.com>
Suggested-by: Fred Isaman <iisaman@...app.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/nfs/blocklayout/blocklayout.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 9c94297..7f6a23f 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -38,6 +38,8 @@
 #include <linux/buffer_head.h>	/* various write calls */
 #include <linux/prefetch.h>
 
+#include "../pnfs.h"
+#include "../internal.h"
 #include "blocklayout.h"
 
 #define NFSDBG_FACILITY	NFSDBG_PNFS_LD
@@ -868,7 +870,7 @@ nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh,
 	 * GETDEVICEINFO's maxcount
 	 */
 	max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
-	max_pages = max_resp_sz >> PAGE_SHIFT;
+	max_pages = nfs_page_array_len(0, max_resp_sz);
 	dprintk("%s max_resp_sz %u max_pages %d\n",
 		__func__, max_resp_sz, max_pages);
 


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