mirror_zfs/include/libuutil_impl.h

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or https://opensource.org/licenses/CDDL-1.0.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef	_LIBUUTIL_IMPL_H
#define	_LIBUUTIL_IMPL_H



#include <libuutil.h>
#include <pthread.h>

#include <sys/avl_impl.h>
#include <sys/byteorder.h>

#ifdef	__cplusplus
extern "C" {
#endif

void uu_set_error(uint_t);


__attribute__((format(printf, 1, 2), __noreturn__))
void uu_panic(const char *format, ...);


/*
 * For debugging purposes, libuutil keeps around linked lists of all uu_lists
 * and uu_avls, along with pointers to their parents.  These can cause false
 * negatives when looking for memory leaks, so we encode the pointers by
 * storing them with swapped endianness;  this is not perfect, but it's about
 * the best we can do without wasting a lot of space.
 */
#ifdef _LP64
#define	UU_PTR_ENCODE(ptr)		BSWAP_64((uintptr_t)(void *)(ptr))
#else
#define	UU_PTR_ENCODE(ptr)		BSWAP_32((uintptr_t)(void *)(ptr))
#endif

#define	UU_PTR_DECODE(ptr)		((void *)UU_PTR_ENCODE(ptr))

/*
 * uu_list structures
 */
typedef struct uu_list_node_impl {
	struct uu_list_node_impl *uln_next;
	struct uu_list_node_impl *uln_prev;
} uu_list_node_impl_t;

struct uu_list_walk {
	uu_list_walk_t	*ulw_next;
	uu_list_walk_t	*ulw_prev;

	uu_list_t	*ulw_list;
	int8_t		ulw_dir;
	uint8_t		ulw_robust;
	uu_list_node_impl_t *ulw_next_result;
};

struct uu_list {
	uintptr_t	ul_next_enc;
	uintptr_t	ul_prev_enc;

	uu_list_pool_t	*ul_pool;
	uintptr_t	ul_parent_enc;	/* encoded parent pointer */
	size_t		ul_offset;
	size_t		ul_numnodes;
	uint8_t		ul_debug;
	uint8_t		ul_sorted;
	uint8_t		ul_index;	/* mark for uu_list_index_ts */

	uu_list_node_impl_t ul_null_node;
	uu_list_walk_t	ul_null_walk;	/* for robust walkers */
};

#define	UU_LIST_PTR(ptr)		((uu_list_t *)UU_PTR_DECODE(ptr))

#define	UU_LIST_POOL_MAXNAME	64

struct uu_list_pool {
	uu_list_pool_t	*ulp_next;
	uu_list_pool_t	*ulp_prev;

	char		ulp_name[UU_LIST_POOL_MAXNAME];
	size_t		ulp_nodeoffset;
	size_t		ulp_objsize;
	uu_compare_fn_t	*ulp_cmp;
	uint8_t		ulp_debug;
	uint8_t		ulp_last_index;
	pthread_mutex_t	ulp_lock;		/* protects null_list */
	uu_list_t	ulp_null_list;
};

/*
 * uu_avl structures
 */
typedef struct avl_node		uu_avl_node_impl_t;

struct uu_avl_walk {
	uu_avl_walk_t	*uaw_next;
	uu_avl_walk_t	*uaw_prev;

	uu_avl_t	*uaw_avl;
	void		*uaw_next_result;
	int8_t		uaw_dir;
	uint8_t		uaw_robust;
};

struct uu_avl {
	uintptr_t	ua_next_enc;
	uintptr_t	ua_prev_enc;

	uu_avl_pool_t	*ua_pool;
	uintptr_t	ua_parent_enc;
	uint8_t		ua_debug;
	uint8_t		ua_index;	/* mark for uu_avl_index_ts */

	struct avl_tree	ua_tree;
	uu_avl_walk_t	ua_null_walk;
};

#define	UU_AVL_PTR(x)		((uu_avl_t *)UU_PTR_DECODE(x))

#define	UU_AVL_POOL_MAXNAME	64

struct uu_avl_pool {
	uu_avl_pool_t	*uap_next;
	uu_avl_pool_t	*uap_prev;

	char		uap_name[UU_AVL_POOL_MAXNAME];
	size_t		uap_nodeoffset;
	size_t		uap_objsize;
	uu_compare_fn_t	*uap_cmp;
	uint8_t		uap_debug;
	uint8_t		uap_last_index;
	pthread_mutex_t	uap_lock;		/* protects null_avl */
	uu_avl_t	uap_null_avl;
};

/*
 * atfork() handlers
 */
void uu_avl_lockup(void);
void uu_avl_release(void);

void uu_list_lockup(void);
void uu_list_release(void);

#ifdef	__cplusplus
}
#endif

#endif	/* _LIBUUTIL_IMPL_H */