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/*
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://zfsonlinux.org/>.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _SPL_LIST_H
#define _SPL_LIST_H
#include <sys/types.h>
#include <sys/debug.h>
#include <linux/list.h>
/*
* NOTE: I have implemented the Solaris list API in terms of the native
* linux API. This has certain advantages in terms of leveraging the linux
* list debugging infrastructure, but it also means that the internals of a
* list differ slightly than on Solaris. This is not a problem as long as
* all callers stick to the published API. The two major differences are:
*
* 1) A list_node_t is mapped to a linux list_head struct which changes
* the name of the list_next/list_prev pointers to next/prev respectively.
*
* 2) A list_node_t which is not attached to a list on Solaris is denoted
* by having its list_next/list_prev pointers set to NULL. Under linux
* the next/prev pointers are set to LIST_POISON1 and LIST_POISON2
* respectively. At this moment this only impacts the implementation
* of the list_link_init() and list_link_active() functions.
*/
typedef struct list_head list_node_t;
typedef struct list {
size_t list_size;
size_t list_offset;
list_node_t list_head;
} list_t;
#define list_d2l(a, obj) ((list_node_t *)(((char *)obj) + (a)->list_offset))
#define list_object(a, node) ((void *)(((char *)node) - (a)->list_offset))
static inline int
list_is_empty(list_t *list)
{
return (list_empty(&list->list_head));
}
static inline void
list_link_init(list_node_t *node)
{
node->next = LIST_POISON1;
node->prev = LIST_POISON2;
}
static inline void
list_create(list_t *list, size_t size, size_t offset)
{
list->list_size = size;
list->list_offset = offset;
INIT_LIST_HEAD(&list->list_head);
}
static inline void
list_destroy(list_t *list)
{
list_del(&list->list_head);
}
static inline void
list_insert_head(list_t *list, void *object)
{
list_add(list_d2l(list, object), &list->list_head);
}
static inline void
list_insert_tail(list_t *list, void *object)
{
list_add_tail(list_d2l(list, object), &list->list_head);
}
static inline void
list_insert_after(list_t *list, void *object, void *nobject)
{
if (object == NULL)
list_insert_head(list, nobject);
else
list_add(list_d2l(list, nobject), list_d2l(list, object));
}
static inline void
list_insert_before(list_t *list, void *object, void *nobject)
{
if (object == NULL)
list_insert_tail(list, nobject);
else
list_add_tail(list_d2l(list, nobject), list_d2l(list, object));
}
static inline void
list_remove(list_t *list, void *object)
{
list_del(list_d2l(list, object));
}
static inline void *
list_remove_head(list_t *list)
{
list_node_t *head = list->list_head.next;
if (head == &list->list_head)
return (NULL);
list_del(head);
return (list_object(list, head));
}
static inline void *
list_remove_tail(list_t *list)
{
list_node_t *tail = list->list_head.prev;
if (tail == &list->list_head)
return (NULL);
list_del(tail);
return (list_object(list, tail));
}
static inline void *
list_head(list_t *list)
{
if (list_is_empty(list))
return (NULL);
return (list_object(list, list->list_head.next));
}
static inline void *
list_tail(list_t *list)
{
if (list_is_empty(list))
return (NULL);
return (list_object(list, list->list_head.prev));
}
static inline void *
list_next(list_t *list, void *object)
{
list_node_t *node = list_d2l(list, object);
if (node->next != &list->list_head)
return (list_object(list, node->next));
return (NULL);
}
static inline void *
list_prev(list_t *list, void *object)
{
list_node_t *node = list_d2l(list, object);
if (node->prev != &list->list_head)
return (list_object(list, node->prev));
return (NULL);
}
static inline int
list_link_active(list_node_t *node)
{
EQUIV(node->next == LIST_POISON1, node->prev == LIST_POISON2);
return (node->next != LIST_POISON1);
}
static inline void
spl_list_move_tail(list_t *dst, list_t *src)
{
list_splice_init(&src->list_head, dst->list_head.prev);
}
#define list_move_tail(dst, src) spl_list_move_tail(dst, src)
static inline void
list_link_replace(list_node_t *old_node, list_node_t *new_node)
{
new_node->next = old_node->next;
new_node->prev = old_node->prev;
old_node->prev->next = new_node;
old_node->next->prev = new_node;
list_link_init(old_node);
}
#endif /* SPL_LIST_H */
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