fix page number calculation bug for block layout decode buffer

Signed-off-by: Jim Rees <rees@umich.edu>
Suggested-by: Andy Adamson <andros@netapp.com>
Suggested-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 9c94297bb70e..7f6a23f0244e 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);