ocfs2: Fix some casting errors related to file writes

ocfs2_align_clusters_to_page_index() needs to cast the clusters shift to
pgoff_t and ocfs2_file_buffered_write() needs loff_t when calculating
destination start for memcpy.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 7e508e2..b1ae4c7 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1959,7 +1959,7 @@
 		}
 
 		dst = kmap_atomic(page, KM_USER0);
-		memcpy(dst + (pos & (PAGE_CACHE_SIZE - 1)), buf, bytes);
+		memcpy(dst + (pos & (loff_t)(PAGE_CACHE_SIZE - 1)), buf, bytes);
 		kunmap_atomic(dst, KM_USER0);
 		flush_dcache_page(page);
 		ocfs2_put_write_source(user_page);