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static struct hlist_head *inode_hashtable __read_mostly;

/* * Initialize the waitqueues and inode hash table. */void __init inode_init_early(void){	unsigned int loop;	/* If hashes are distributed across NUMA nodes, defer	 * hash allocation until vmalloc space is available.	 */	if (hashdist)		return;	inode_hashtable =		alloc_large_system_hash("Inode-cache",					sizeof(struct hlist_head),					ihash_entries,					14,					HASH_EARLY,					&i_hash_shift,					&i_hash_mask,					0,					0);	for (loop = 0; loop < (1U << i_hash_shift); loop++)		INIT_HLIST_HEAD(&inode_hashtable[loop]);}

static inline void insert_inode_hash(struct inode *inode){	__insert_inode_hash(inode, inode->i_ino);}

static unsigned long hash(struct super_block *sb, unsigned long hashval){	unsigned long tmp;	tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) /			L1_CACHE_BYTES;	tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift);	return tmp & i_hash_mask;}

/**

 *	__insert_inode_hash - hash an inode *	@inode: unhashed inode *	@hashval: unsigned long value used to locate this object in the *		inode_hashtable. * *	Add an inode to the inode hash for this superblock. */void __insert_inode_hash(struct inode *inode, unsigned long hashval){	struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval);	spin_lock(&inode_hash_lock);	spin_lock(&inode->i_lock);	hlist_add_head(&inode->i_hash, b);	spin_unlock(&inode->i_lock);	spin_unlock(&inode_hash_lock);}EXPORT_SYMBOL(__insert_inode_hash);

/** * __remove_inode_hash - remove an inode from the hash * @inode: inode to unhash * * Remove an inode from the superblock. */void __remove_inode_hash(struct inode *inode){ spin_lock(&inode_hash_lock); spin_lock(&inode->i_lock); hlist_del_init(&inode->i_hash); spin_unlock(&inode->i_lock); spin_unlock(&inode_hash_lock);}EXPORT_SYMBOL(__remove_inode_hash);

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