of the in-tree instances did). inode_hash_lock is still held,
of course, so they are still serialized wrt removal from inode hash,
as well as wrt set() callback of iget5_locked().
+--
+[mandatory]
+ d_materialise_unique() is gone; d_splice_alias() does everything you
+ need now. Remember that they have opposite orders of arguments ;-/
+--
+[mandatory]
+ f_dentry is gone; use f_path.dentry, or, better yet, see if you can avoid
+ it entirely.