From 74931da7a6d341c137f1564a47f36fda68ad21e6 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 14 Jul 2013 17:43:25 +0400
Subject: make simple_lookup() usable for filesystems that set ->s_d_op

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/libfs.c b/fs/libfs.c
index c3a0837..3a3a9b5 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -61,7 +61,8 @@ struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, unsigned
 
 	if (dentry->d_name.len > NAME_MAX)
 		return ERR_PTR(-ENAMETOOLONG);
-	d_set_d_op(dentry, &simple_dentry_operations);
+	if (!dentry->d_sb->s_d_op)
+		d_set_d_op(dentry, &simple_dentry_operations);
 	d_add(dentry, NULL);
 	return NULL;
 }
-- 
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