staging/lustre: fix for invalidatepage() API change

somehow this got dropped during merge window...
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NPeng Tao <tao.peng@emc.com>
Signed-off-by: NAndreas Dilger <andreas.dilger@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h

@@ -53,7 +53,7 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
 		return;
 
 	if (PagePrivate(page))
-		page->mapping->a_ops->invalidatepage(page, 0);
+		page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE);
 
 	cancel_dirty_page(page, PAGE_SIZE);
 	ClearPageMappedToDisk(page);

drivers/staging/lustre/lustre/llite/rw26.c

@@ -72,7 +72,8 @@
  * aligned truncate). Lustre leaves partially truncated page in the cache,
  * relying on struct inode::i_size to limit further accesses.
  */
-static void ll_invalidatepage(struct page *vmpage, unsigned long offset)
+static void ll_invalidatepage(struct page *vmpage, unsigned int offset,
+			      unsigned int length)
 {
 	struct inode     *inode;
 	struct lu_env    *env;
@@ -89,7 +90,7 @@ static void ll_invalidatepage(struct page *vmpage, unsigned long offset)
 	 * below because they are run with page locked and all our io is
 	 * happening with locked page too
 	 */
-	if (offset == 0) {
+	if (offset == 0 && length == PAGE_CACHE_SIZE) {
 		env = cl_env_get(&refcheck);
 		if (!IS_ERR(env)) {
 			inode = vmpage->mapping->host;