2 * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (c) 2010 Isilon Systems, Inc.
4 * Copyright (c) 2010 iX Systems, Inc.
5 * Copyright (c) 2010 Panasas, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #ifndef _LINUX_LIST_H_
30 #define _LINUX_LIST_H_
38 #define container_of(ptr, type, member) \
40 const typeof(((type *) NULL)->member) *__mptr = (ptr); \
41 (type *) ((char *) __mptr - offsetof(type, member)); \
46 struct list_head *next;
47 struct list_head *prev;
50 #define LIST_HEAD_INIT(name) { &(name), &(name) }
52 #define LIST_HEAD(name) struct list_head name = LIST_HEAD_INIT(name)
55 INIT_LIST_HEAD(struct list_head *list)
57 list->next = list->prev = list;
61 list_empty(const struct list_head *head)
63 return (head->next == head);
67 list_is_first(const struct list_head *list,
68 const struct list_head *head)
70 return list->prev == head;
74 list_is_last(const struct list_head *list,
75 const struct list_head *head)
77 return list->next == head;
81 _list_del(struct list_head *entry)
83 entry->next->prev = entry->prev;
84 entry->prev->next = entry->next;
88 list_del(struct list_head *entry)
91 entry->next = entry->prev = NULL;
95 _list_add(struct list_head *_new, struct list_head *prev,
96 struct list_head *next)
106 list_del_init(struct list_head *entry)
109 INIT_LIST_HEAD(entry);
112 #define list_entry(ptr, type, field) container_of(ptr, type, field)
113 #define list_first_entry(ptr, type, field) list_entry((ptr)->next, type, field)
114 #define list_last_entry(ptr, type, field) list_entry((ptr)->prev, type, field)
116 #define list_for_each(p, head) \
117 for (p = (head)->next; p != (head); p = p->next)
119 #define list_for_each_safe(p, n, head) \
120 for (p = (head)->next, n = p->next; p != (head); p = n, n = p->next)
122 #define list_for_each_entry(p, h, field) \
123 for (p = list_first_entry(h, typeof(*p), field); &p->field != (h); \
124 p = list_entry(p->field.next, typeof(*p), field))
126 #define list_for_each_entry_safe(p, n, h, field) \
127 for (p = list_first_entry(h, typeof(*p), field), \
128 n = list_entry(p->field.next, typeof(*p), field); &p->field != (h);\
129 p = n, n = list_entry(n->field.next, typeof(*n), field))
131 #define list_for_each_entry_reverse(p, h, field) \
132 for (p = list_last_entry(h, typeof(*p), field); &p->field != (h); \
133 p = list_entry(p->field.prev, typeof(*p), field))
135 #define list_for_each_prev(p, h) for (p = (h)->prev; p != (h); p = p->prev)
136 #define list_for_each_prev_safe(p, n, h) for (p = (h)->prev, n = p->prev; p != (h); p = n, n = p->prev)
139 list_add(struct list_head *_new, struct list_head *head)
141 _list_add(_new, head, head->next);
145 list_add_tail(struct list_head *_new, struct list_head *head)
147 _list_add(_new, head->prev, head);
151 list_move(struct list_head *list, struct list_head *head)
154 list_add(list, head);
158 list_move_tail(struct list_head *entry, struct list_head *head)
161 list_add_tail(entry, head);
165 _list_splice(const struct list_head *list, struct list_head *prev,
166 struct list_head *next)
168 struct list_head *first;
169 struct list_head *last;
171 if (list_empty(list))
183 list_splice(const struct list_head *list, struct list_head *head)
185 _list_splice(list, head, head->next);
189 list_splice_tail(struct list_head *list, struct list_head *head)
191 _list_splice(list, head->prev, head);
195 list_splice_init(struct list_head *list, struct list_head *head)
197 _list_splice(list, head, head->next);
198 INIT_LIST_HEAD(list);
202 list_splice_tail_init(struct list_head *list, struct list_head *head)
204 _list_splice(list, head->prev, head);
205 INIT_LIST_HEAD(list);
208 #endif /* _LINUX_LIST_H_ */