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Commit 9308a612 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Al Viro
Browse files

[PATCH] kill d_alloc_anon 



Remove d_alloc_anon now that no users are left.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 44003728

fs/dcache.c

+37 −71
Original line number Diff line number Diff line
@@ -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);

include/linux/dcache.h

+0 −1
Original line number Diff line number Diff line
@@ -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 *);