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/*
Copyright (c) 2008-2010 Gluster, Inc. <http://www.gluster.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifndef _LLIST_H
#define _LLIST_H
struct list_head {
struct list_head *next;
struct list_head *prev;
};
#define INIT_LIST_HEAD(head) do { \
(head)->next = (head)->prev = head; \
} while (0)
static inline void
list_add (struct list_head *new, struct list_head *head)
{
new->prev = head;
new->next = head->next;
new->prev->next = new;
new->next->prev = new;
}
static inline void
list_add_tail (struct list_head *new, struct list_head *head)
{
new->next = head;
new->prev = head->prev;
new->prev->next = new;
new->next->prev = new;
}
static inline void
list_del (struct list_head *old)
{
old->prev->next = old->next;
old->next->prev = old->prev;
old->next = (void *)0xbabebabe;
old->prev = (void *)0xcafecafe;
}
static inline void
list_del_init (struct list_head *old)
{
old->prev->next = old->next;
old->next->prev = old->prev;
old->next = old;
old->prev = old;
}
static inline void
list_move (struct list_head *list, struct list_head *head)
{
list_del (list);
list_add (list, head);
}
static inline void
list_move_tail (struct list_head *list, struct list_head *head)
{
list_del (list);
list_add_tail (list, head);
}
static inline int
list_empty (struct list_head *head)
{
return (head->next == head);
}
static inline void
__list_splice (struct list_head *list, struct list_head *head)
{
(list->prev)->next = (head->next);
(head->next)->prev = (list->prev);
(head)->next = (list->next);
(list->next)->prev = (head);
}
static inline void
list_splice (struct list_head *list, struct list_head *head)
{
if (list_empty (list))
return;
__list_splice (list, head);
}
/* Splice moves @list to the head of the list at @head. */
static inline void
list_splice_init (struct list_head *list, struct list_head *head)
{
if (list_empty (list))
return;
__list_splice (list, head);
INIT_LIST_HEAD (list);
}
static inline void
__list_append (struct list_head *list, struct list_head *head)
{
(head->prev)->next = (list->next);
(list->next)->prev = (head->prev);
(head->prev) = (list->prev);
(list->prev)->next = head;
}
static inline void
list_append (struct list_head *list, struct list_head *head)
{
if (list_empty (list))
return;
__list_append (list, head);
}
/* Append moves @list to the end of @head */
static inline void
list_append_init (struct list_head *list, struct list_head *head)
{
if (list_empty (list))
return;
__list_append (list, head);
INIT_LIST_HEAD (list);
}
#define list_entry(ptr, type, member) \
((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
#define list_for_each(pos, head) \
for (pos = (head)->next; pos != (head); pos = pos->next)
#define list_for_each_entry(pos, head, member) \
for (pos = list_entry((head)->next, typeof(*pos), member); \
&pos->member != (head); \
pos = list_entry(pos->member.next, typeof(*pos), member))
#define list_for_each_entry_safe(pos, n, head, member) \
for (pos = list_entry((head)->next, typeof(*pos), member), \
n = list_entry(pos->member.next, typeof(*pos), member); \
&pos->member != (head); \
pos = n, n = list_entry(n->member.next, typeof(*n), member))
#endif /* _LLIST_H */
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