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Date: Mon, 24 May 2004 08:03:15 -0400
From: hch@infradead.org
To: "Peter J. Braam" <braam@clusterfs.com>
Cc: torvalds@osdl.org, akpm@osdl.org, linux-kernel@vger.kernel.org,
       "'Phil Schwan'" <phil@clusterfs.com>
Subject: Re: [PATCH/RFC] Lustre VFS patch
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> vfs-dcache_locking-vanilla-2.6.patch
> 
>   A trivial patch to make functions available to lustre that do
>   d_move, d_rehash, without taking/dropping the dcache lock.


-void d_rehash(struct dentry * entry)
+void __d_rehash(struct dentry * entry)
 {
 	struct hlist_head *list = d_hash(entry->d_parent, entry->d_name.hash);
-	spin_lock(&dcache_lock);
  	entry->d_vfs_flags &= ~DCACHE_UNHASHED;
 	entry->d_bucket = list;
  	hlist_add_head_rcu(&entry->d_hash, list);
+}
+
+EXPORT_SYMBOL(__d_rehash);

looks okay as change but explanation is missing.

+EXPORT_SYMBOL(__d_move);
+
+void d_move(struct dentry *dentry, struct dentry *target)
+{
+	spin_lock(&dcache_lock);
+	__d_move(dentry, target);
 	spin_unlock(&dcache_lock);
 }

dito.