/*-
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2010 iX Systems, Inc.
* Copyright (c) 2010 Panasas, Inc.
* Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUX_LIST_H_
#define _LINUX_LIST_H_
#define container_of(ptr, type, member) \
({ \
const __typeof(((type *)0)->member) *__p = (ptr); \
(type *)((uintptr_t)__p - offsetof(type, member)); \
})
#define LINUX_LIST_HEAD_INIT(name) { &(name), &(name) }
#define LINUX_LIST_HEAD(name) \
struct list_head name = LINUX_LIST_HEAD_INIT(name)
#ifndef LIST_HEAD_DEF
#define LIST_HEAD_DEF
struct list_head {
struct list_head *next;
struct list_head *prev;
};
#endif
#define barrier() __asm__ __volatile__("": : :"memory")
#define ACCESS_ONCE(x) (*(volatile __typeof(x) *)&(x))
#define WRITE_ONCE(x,v) do { \
barrier(); \
ACCESS_ONCE(x) = (v); \
barrier(); \
} while (0)
#define READ_ONCE(x) ({ \
__typeof(x) __var = ({ \
barrier(); \
ACCESS_ONCE(x); \
}); \
barrier(); \
__var; \
})
static inline void
INIT_LIST_HEAD(struct list_head *list)
{
list->next = list->prev = list;
}
static inline int
list_empty(const struct list_head *head)
{
return (head->next == head);
}
static inline int
list_empty_careful(const struct list_head *head)
{
struct list_head *next = head->next;
return ((next == head) && (next == head->prev));
}
static inline void
__list_del(struct list_head *prev, struct list_head *next)
{
next->prev = prev;
WRITE_ONCE(prev->next, next);
}
static inline void
__list_del_entry(struct list_head *entry)
{
__list_del(entry->prev, entry->next);
}
static inline void
list_del(struct list_head *entry)
{
__list_del(entry->prev, entry->next);
}
static inline void
list_replace(struct list_head *old, struct list_head *new)
{
new->next = old->next;
new->next->prev = new;
new->prev = old->prev;
new->prev->next = new;
}
static inline void
list_replace_init(struct list_head *old, struct list_head *new)
{
list_replace(old, new);
INIT_LIST_HEAD(old);
}
static inline void
linux_list_add(struct list_head *new, struct list_head *prev,
struct list_head *next)
{
next->prev = new;
new->next = next;
new->prev = prev;
prev->next = new;
}
static inline void
list_del_init(struct list_head *entry)
{
list_del(entry);
INIT_LIST_HEAD(entry);
}
#define list_entry(ptr, type, field) container_of(ptr, type, field)
#define list_first_entry(ptr, type, member) \
list_entry((ptr)->next, type, member)
#define list_last_entry(ptr, type, member) \
list_entry((ptr)->prev, type, member)
#define list_first_entry_or_null(ptr, type, member) \
(!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL)
#define list_next_entry(ptr, member) \
list_entry(((ptr)->member.next), typeof(*(ptr)), member)
#define list_safe_reset_next(ptr, n, member) \
(n) = list_next_entry(ptr, member)
#define list_prev_entry(ptr, member) \
list_entry(((ptr)->member.prev), typeof(*(ptr)), member)
#define list_for_each(p, head) \
for (p = (head)->next; p != (head); p = (p)->next)
#define list_for_each_safe(p, n, head) \
for (p = (head)->next, n = (p)->next; p != (head); p = n, n = (p)->next)
#define list_for_each_entry(p, h, field) \
for (p = list_entry((h)->next, typeof(*p), field); &(p)->field != (h); \
p = list_entry((p)->field.next, typeof(*p), field))
#define list_for_each_entry_safe(p, n, h, field) \
for (p = list_entry((h)->next, typeof(*p), field), \
n = list_entry((p)->field.next, typeof(*p), field); &(p)->field != (h);\
p = n, n = list_entry(n->field.next, typeof(*n), field))
#define list_for_each_entry_from(p, h, field) \
for ( ; &(p)->field != (h); \
p = list_entry((p)->field.next, typeof(*p), field))
#define list_for_each_entry_continue(p, h, field) \
for (p = list_next_entry((p), field); &(p)->field != (h); \
p = list_next_entry((p), field))
#define list_for_each_entry_safe_from(pos, n, head, member) \
for (n = list_entry((pos)->member.next, typeof(*pos), member); \
&(pos)->member != (head); \
pos = n, n = list_entry(n->member.next, typeof(*n), member))
#define list_for_each_entry_reverse(p, h, field) \
for (p = list_entry((h)->prev, typeof(*p), field); &(p)->field != (h); \
p = list_entry((p)->field.prev, typeof(*p), field))
#define list_for_each_entry_safe_reverse(p, n, h, field) \
for (p = list_entry((h)->prev, typeof(*p), field), \
n = list_entry((p)->field.prev, typeof(*p), field); &(p)->field != (h); \
p = n, n = list_entry(n->field.prev, typeof(*n), field))
#define list_for_each_entry_continue_reverse(p, h, field) \
for (p = list_entry((p)->field.prev, typeof(*p), field); &(p)->field != (h); \
p = list_entry((p)->field.prev, typeof(*p), field))
#define list_for_each_prev(p, h) for (p = (h)->prev; p != (h); p = (p)->prev)
static inline void
list_add(struct list_head *new, struct list_head *head)
{
linux_list_add(new, head, head->next);
}
static inline void
list_add_tail(struct list_head *new, struct list_head *head)
{
linux_list_add(new, head->prev, head);
}
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 *entry, struct list_head *head)
{
list_del(entry);
list_add_tail(entry, head);
}
static inline void
linux_list_splice(const struct list_head *list, struct list_head *prev,
struct list_head *next)
{
struct list_head *first;
struct list_head *last;
if (list_empty(list))
return;
first = list->next;
last = list->prev;
first->prev = prev;
prev->next = first;
last->next = next;
next->prev = last;
}
static inline void
list_splice(const struct list_head *list, struct list_head *head)
{
linux_list_splice(list, head, head->next);
}
static inline void
list_splice_tail(struct list_head *list, struct list_head *head)
{
linux_list_splice(list, head->prev, head);
}
static inline void
list_splice_init(struct list_head *list, struct list_head *head)
{
linux_list_splice(list, head, head->next);
INIT_LIST_HEAD(list);
}
static inline void
list_splice_tail_init(struct list_head *list, struct list_head *head)
{
linux_list_splice(list, head->prev, head);
INIT_LIST_HEAD(list);
}
#undef LIST_HEAD
#define LIST_HEAD(name) struct list_head name = { &(name), &(name) }
struct hlist_head {
struct hlist_node *first;
};
struct hlist_node {
struct hlist_node *next, **pprev;
};
#define HLIST_HEAD_INIT { }
#define HLIST_HEAD(name) struct hlist_head name = HLIST_HEAD_INIT
#define INIT_HLIST_HEAD(head) (head)->first = NULL
#define INIT_HLIST_NODE(node) \
do { \
(node)->next = NULL; \
(node)->pprev = NULL; \
} while (0)
static inline int
hlist_unhashed(const struct hlist_node *h)
{
return !h->pprev;
}
static inline int
hlist_empty(const struct hlist_head *h)
{
return !h->first;
}
static inline void
hlist_del(struct hlist_node *n)
{
if (n->next)
n->next->pprev = n->pprev;
*n->pprev = n->next;
}
static inline void
hlist_del_init(struct hlist_node *n)
{
if (hlist_unhashed(n))
return;
hlist_del(n);
INIT_HLIST_NODE(n);
}
static inline void
hlist_add_head(struct hlist_node *n, struct hlist_head *h)
{
n->next = h->first;
if (h->first)
h->first->pprev = &n->next;
h->first = n;
n->pprev = &h->first;
}
static inline void
hlist_add_before(struct hlist_node *n, struct hlist_node *next)
{
n->pprev = next->pprev;
n->next = next;
next->pprev = &n->next;
*(n->pprev) = n;
}
static inline void
hlist_add_after(struct hlist_node *n, struct hlist_node *next)
{
next->next = n->next;
n->next = next;
next->pprev = &n->next;
if (next->next)
next->next->pprev = &next->next;
}
static inline void
hlist_move_list(struct hlist_head *old, struct hlist_head *new)
{
new->first = old->first;
if (new->first)
new->first->pprev = &new->first;
old->first = NULL;
}
static inline int list_is_singular(const struct list_head *head)
{
return !list_empty(head) && (head->next == head->prev);
}
static inline void __list_cut_position(struct list_head *list,
struct list_head *head, struct list_head *entry)
{
struct list_head *new_first = entry->next;
list->next = head->next;
list->next->prev = list;
list->prev = entry;
entry->next = list;
head->next = new_first;
new_first->prev = head;
}
static inline void list_cut_position(struct list_head *list,
struct list_head *head, struct list_head *entry)
{
if (list_empty(head))
return;
if (list_is_singular(head) &&
(head->next != entry && head != entry))
return;
if (entry == head)
INIT_LIST_HEAD(list);
else
__list_cut_position(list, head, entry);
}
static inline int list_is_last(const struct list_head *list,
const struct list_head *head)
{
return list->next == head;
}
#define hlist_entry(ptr, type, field) container_of(ptr, type, field)
#define hlist_for_each(p, head) \
for (p = (head)->first; p; p = (p)->next)
#define hlist_for_each_safe(p, n, head) \
for (p = (head)->first; p && ({ n = (p)->next; 1; }); p = n)
#define hlist_entry_safe(ptr, type, member) \
((ptr) ? hlist_entry(ptr, type, member) : NULL)
#define hlist_for_each_entry(pos, head, member) \
for (pos = hlist_entry_safe((head)->first, typeof(*(pos)), member);\
pos; \
pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
#define hlist_for_each_entry_continue(pos, member) \
for (pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member); \
(pos); \
pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
#define hlist_for_each_entry_from(pos, member) \
for (; (pos); \
pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
#define hlist_for_each_entry_safe(pos, n, head, member) \
for (pos = hlist_entry_safe((head)->first, typeof(*(pos)), member); \
(pos) && ({ n = (pos)->member.next; 1; }); \
pos = hlist_entry_safe(n, typeof(*(pos)), member))
extern void list_sort(void *priv, struct list_head *head, int (*cmp)(void *priv,
struct list_head *a, struct list_head *b));
#endif /* _LINUX_LIST_H_ */
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