cifs: convert async write code to pass in data via rq_pages array

Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index a817900..cc70ac0 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -999,8 +999,8 @@
 	pid_t				pid;
 	unsigned int			bytes;
 	int				result;
-	void (*marshal_iov) (struct kvec *iov,
-			     struct cifs_writedata *wdata);
+	unsigned int			pagesz;
+	unsigned int			tailsz;
 	unsigned int			nr_pages;
 	struct page			*pages[1];
 };