make simple_lookup() usable for filesystems that set ->s_d_op

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

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/libfs.c b/fs/libfs.c
index c3a0837fb861..3a3a9b53bf5a 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;
 }