From 9308a6128d9074e348d9f9b5822546fe12a794a9 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Mon, 11 Aug 2008 15:49:12 +0200
Subject: [PATCH] [PATCH] kill d_alloc_anon

Remove d_alloc_anon now that no users are left.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/dcache.c            | 108 ++++++++++++++---------------------------
 include/linux/dcache.h |   1 -
 2 files changed, 37 insertions(+), 72 deletions(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index d45ff7f5ecc2..1710d2484fd9 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1110,70 +1110,6 @@ static inline struct hlist_head *d_hash(struct dentry *parent,
 	return dentry_hashtable + (hash & D_HASHMASK);
 }
 
-/**
- * d_alloc_anon - allocate an anonymous dentry
- * @inode: inode to allocate the dentry for
- *
- * This is similar to d_alloc_root.  It is used by filesystems when
- * creating a dentry for a given inode, often in the process of 
- * mapping a filehandle to a dentry.  The returned dentry may be
- * anonymous, or may have a full name (if the inode was already
- * in the cache).  The file system may need to make further
- * efforts to connect this dentry into the dcache properly.
- *
- * When called on a directory inode, we must ensure that
- * the inode only ever has one dentry.  If a dentry is
- * found, that is returned instead of allocating a new one.
- *
- * On successful return, the reference to the inode has been transferred
- * to the dentry.  If %NULL is returned (indicating kmalloc failure),
- * the reference on the inode has not been released.
- */
-
-struct dentry * d_alloc_anon(struct inode *inode)
-{
-	static const struct qstr anonstring = { .name = "" };
-	struct dentry *tmp;
-	struct dentry *res;
-
-	if ((res = d_find_alias(inode))) {
-		iput(inode);
-		return res;
-	}
-
-	tmp = d_alloc(NULL, &anonstring);
-	if (!tmp)
-		return NULL;
-
-	tmp->d_parent = tmp; /* make sure dput doesn't croak */
-	
-	spin_lock(&dcache_lock);
-	res = __d_find_alias(inode, 0);
-	if (!res) {
-		/* attach a disconnected dentry */
-		res = tmp;
-		tmp = NULL;
-		spin_lock(&res->d_lock);
-		res->d_sb = inode->i_sb;
-		res->d_parent = res;
-		res->d_inode = inode;
-		res->d_flags |= DCACHE_DISCONNECTED;
-		res->d_flags &= ~DCACHE_UNHASHED;
-		list_add(&res->d_alias, &inode->i_dentry);
-		hlist_add_head(&res->d_hash, &inode->i_sb->s_anon);
-		spin_unlock(&res->d_lock);
-
-		inode = NULL; /* don't drop reference */
-	}
-	spin_unlock(&dcache_lock);
-
-	if (inode)
-		iput(inode);
-	if (tmp)
-		dput(tmp);
-	return res;
-}
-
 /**
  * d_obtain_alias - find or allocate a dentry for a given inode
  * @inode: inode to allocate the dentry for
@@ -1194,19 +1130,50 @@ struct dentry * d_alloc_anon(struct inode *inode)
  */
 struct dentry *d_obtain_alias(struct inode *inode)
 {
-	struct dentry *dentry;
+	static const struct qstr anonstring = { .name = "" };
+	struct dentry *tmp;
+	struct dentry *res;
 
 	if (!inode)
 		return ERR_PTR(-ESTALE);
 	if (IS_ERR(inode))
 		return ERR_CAST(inode);
 
-	dentry = d_alloc_anon(inode);
-	if (!dentry) {
-		iput(inode);
-		dentry = ERR_PTR(-ENOMEM);
+	res = d_find_alias(inode);
+	if (res)
+		goto out_iput;
+
+	tmp = d_alloc(NULL, &anonstring);
+	if (!tmp) {
+		res = ERR_PTR(-ENOMEM);
+		goto out_iput;
 	}
-	return dentry;
+	tmp->d_parent = tmp; /* make sure dput doesn't croak */
+
+	spin_lock(&dcache_lock);
+	res = __d_find_alias(inode, 0);
+	if (res) {
+		spin_unlock(&dcache_lock);
+		dput(tmp);
+		goto out_iput;
+	}
+
+	/* attach a disconnected dentry */
+	spin_lock(&tmp->d_lock);
+	tmp->d_sb = inode->i_sb;
+	tmp->d_inode = inode;
+	tmp->d_flags |= DCACHE_DISCONNECTED;
+	tmp->d_flags &= ~DCACHE_UNHASHED;
+	list_add(&tmp->d_alias, &inode->i_dentry);
+	hlist_add_head(&tmp->d_hash, &inode->i_sb->s_anon);
+	spin_unlock(&tmp->d_lock);
+
+	spin_unlock(&dcache_lock);
+	return tmp;
+
+ out_iput:
+	iput(inode);
+	return res;
 }
 EXPORT_SYMBOL_GPL(d_obtain_alias);
 
@@ -2379,7 +2346,6 @@ void __init vfs_caches_init(unsigned long mempages)
 }
 
 EXPORT_SYMBOL(d_alloc);
-EXPORT_SYMBOL(d_alloc_anon);
 EXPORT_SYMBOL(d_alloc_root);
 EXPORT_SYMBOL(d_delete);
 EXPORT_SYMBOL(d_find_alias);
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 2404257d6c67..74c64ae30cf0 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -228,7 +228,6 @@ extern void d_delete(struct dentry *);
 
 /* allocate/de-allocate */
 extern struct dentry * d_alloc(struct dentry *, const struct qstr *);
-extern struct dentry * d_alloc_anon(struct inode *);
 extern struct dentry * d_splice_alias(struct inode *, struct dentry *);
 extern struct dentry * d_add_ci(struct dentry *, struct inode *, struct qstr *);
 extern struct dentry * d_obtain_alias(struct inode *);