1. 根目录:
2. include
3. linux
4. btree-type.h

#define __BTREE_TP(pfx, type, sfx)	pfx ## type ## sfx
#define _BTREE_TP(pfx, type, sfx)	__BTREE_TP(pfx, type, sfx)
#define BTREE_TP(pfx)			_BTREE_TP(pfx, BTREE_TYPE_SUFFIX,)
#define BTREE_FN(name)			BTREE_TP(btree_ ## name)
#define BTREE_TYPE_HEAD			BTREE_TP(struct btree_head)
#define VISITOR_FN			BTREE_TP(visitor)
#define VISITOR_FN_T			_BTREE_TP(visitor, BTREE_TYPE_SUFFIX, _t)

BTREE_TYPE_HEAD {
	struct btree_head h;
};

static inline void BTREE_FN(init_mempool)(BTREE_TYPE_HEAD *head,
					  mempool_t *mempool)
{
	btree_init_mempool(&head->h, mempool);
}

static inline int BTREE_FN(init)(BTREE_TYPE_HEAD *head)
{
	return btree_init(&head->h);
}

static inline void BTREE_FN(destroy)(BTREE_TYPE_HEAD *head)
{
	btree_destroy(&head->h);
}

static inline int BTREE_FN(merge)(BTREE_TYPE_HEAD *target,
				  BTREE_TYPE_HEAD *victim,
				  gfp_t gfp)
{
	return btree_merge(&target->h, &victim->h, BTREE_TYPE_GEO, gfp);
}

#if (BITS_PER_LONG > BTREE_TYPE_BITS)
static inline void *BTREE_FN(lookup)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE key)
{
	unsigned long _key = key;
	return btree_lookup(&head->h, BTREE_TYPE_GEO, &_key);
}

static inline int BTREE_FN(insert)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE key,
				   void *val, gfp_t gfp)
{
	unsigned long _key = key;
	return btree_insert(&head->h, BTREE_TYPE_GEO, &_key, val, gfp);
}

static inline int BTREE_FN(update)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE key,
		void *val)
{
	unsigned long _key = key;
	return btree_update(&head->h, BTREE_TYPE_GEO, &_key, val);
}

static inline void *BTREE_FN(remove)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE key)
{
	unsigned long _key = key;
	return btree_remove(&head->h, BTREE_TYPE_GEO, &_key);
}

static inline void *BTREE_FN(last)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE *key)
{
	unsigned long _key;
	void *val = btree_last(&head->h, BTREE_TYPE_GEO, &_key);
	if (val)
		*key = _key;
	return val;
}

static inline void *BTREE_FN(get_prev)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE *key)
{
	unsigned long _key = *key;
	void *val = btree_get_prev(&head->h, BTREE_TYPE_GEO, &_key);
	if (val)
		*key = _key;
	return val;
}
#else
static inline void *BTREE_FN(lookup)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE key)
{
	return btree_lookup(&head->h, BTREE_TYPE_GEO, (unsigned long *)&key);
}

static inline int BTREE_FN(insert)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE key,
			   void *val, gfp_t gfp)
{
	return btree_insert(&head->h, BTREE_TYPE_GEO, (unsigned long *)&key,
			    val, gfp);
}

static inline int BTREE_FN(update)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE key,
		void *val)
{
	return btree_update(&head->h, BTREE_TYPE_GEO, (unsigned long *)&key, val);
}

static inline void *BTREE_FN(remove)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE key)
{
	return btree_remove(&head->h, BTREE_TYPE_GEO, (unsigned long *)&key);
}

static inline void *BTREE_FN(last)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE *key)
{
	return btree_last(&head->h, BTREE_TYPE_GEO, (unsigned long *)key);
}

static inline void *BTREE_FN(get_prev)(BTREE_TYPE_HEAD *head, BTREE_KEYTYPE *key)
{
	return btree_get_prev(&head->h, BTREE_TYPE_GEO, (unsigned long *)key);
}
#endif

void VISITOR_FN(void *elem, unsigned long opaque, unsigned long *key,
		size_t index, void *__func);

typedef void (*VISITOR_FN_T)(void *elem, unsigned long opaque,
			     BTREE_KEYTYPE key, size_t index);

static inline size_t BTREE_FN(visitor)(BTREE_TYPE_HEAD *head,
				       unsigned long opaque,
				       VISITOR_FN_T func2)
{
	return btree_visitor(&head->h, BTREE_TYPE_GEO, opaque,
			     visitorl, func2);
}

static inline size_t BTREE_FN(grim_visitor)(BTREE_TYPE_HEAD *head,
					    unsigned long opaque,
					    VISITOR_FN_T func2)
{
	return btree_grim_visitor(&head->h, BTREE_TYPE_GEO, opaque,
				  visitorl, func2);
}

#undef VISITOR_FN
#undef VISITOR_FN_T
#undef __BTREE_TP
#undef _BTREE_TP
#undef BTREE_TP
#undef BTREE_FN
#undef BTREE_TYPE_HEAD
#undef BTREE_TYPE_SUFFIX
#undef BTREE_TYPE_GEO
#undef BTREE_KEYTYPE
#undef BTREE_TYPE_BITS