vfs: switch ->show_options() to struct dentry *

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/proc_namespace.c b/fs/proc_namespace.c
index 8f8304b..1241285 100644
--- a/fs/proc_namespace.c
+++ b/fs/proc_namespace.c
@@ -113,7 +113,7 @@
 		goto out;
 	show_mnt_opts(m, mnt);
 	if (sb->s_op->show_options)
-		err = sb->s_op->show_options(m, mnt);
+		err = sb->s_op->show_options(m, mnt_path.dentry);
 	seq_puts(m, " 0 0\n");
 out:
 	return err;
@@ -174,7 +174,7 @@
 	if (err)
 		goto out;
 	if (sb->s_op->show_options)
-		err = sb->s_op->show_options(m, mnt);
+		err = sb->s_op->show_options(m, mnt->mnt_root);
 	seq_putc(m, '\n');
 out:
 	return err;