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1 | /* | |
2 | * klist.h - Some generic list helpers, extending struct list_head a bit. | |
3 | * | |
4 | * Implementations are found in lib/klist.c | |
5 | * | |
6 | * | |
7 | * Copyright (C) 2005 Patrick Mochel | |
8 | * | |
9 | * This file is rleased under the GPL v2. | |
10 | */ | |
11 | ||
12 | #ifndef _LINUX_KLIST_H | |
13 | #define _LINUX_KLIST_H | |
14 | ||
15 | #include <linux/spinlock.h> | |
16 | #include <linux/kref.h> | |
17 | #include <linux/list.h> | |
18 | ||
19 | struct klist_node; | |
20 | struct klist { | |
21 | spinlock_t k_lock; | |
22 | struct list_head k_list; | |
23 | void (*get)(struct klist_node *); | |
24 | void (*put)(struct klist_node *); | |
25 | } __attribute__ ((aligned (sizeof(void *)))); | |
26 | ||
27 | #define KLIST_INIT(_name, _get, _put) \ | |
28 | { .k_lock = __SPIN_LOCK_UNLOCKED(_name.k_lock), \ | |
29 | .k_list = LIST_HEAD_INIT(_name.k_list), \ | |
30 | .get = _get, \ | |
31 | .put = _put, } | |
32 | ||
33 | #define DEFINE_KLIST(_name, _get, _put) \ | |
34 | struct klist _name = KLIST_INIT(_name, _get, _put) | |
35 | ||
36 | extern void klist_init(struct klist *k, void (*get)(struct klist_node *), | |
37 | void (*put)(struct klist_node *)); | |
38 | ||
39 | struct klist_node { | |
40 | void *n_klist; /* never access directly */ | |
41 | struct list_head n_node; | |
42 | struct kref n_ref; | |
43 | }; | |
44 | ||
45 | extern void klist_add_tail(struct klist_node *n, struct klist *k); | |
46 | extern void klist_add_head(struct klist_node *n, struct klist *k); | |
47 | extern void klist_add_behind(struct klist_node *n, struct klist_node *pos); | |
48 | extern void klist_add_before(struct klist_node *n, struct klist_node *pos); | |
49 | ||
50 | extern void klist_del(struct klist_node *n); | |
51 | extern void klist_remove(struct klist_node *n); | |
52 | ||
53 | extern int klist_node_attached(struct klist_node *n); | |
54 | ||
55 | ||
56 | struct klist_iter { | |
57 | struct klist *i_klist; | |
58 | struct klist_node *i_cur; | |
59 | }; | |
60 | ||
61 | ||
62 | extern void klist_iter_init(struct klist *k, struct klist_iter *i); | |
63 | extern void klist_iter_init_node(struct klist *k, struct klist_iter *i, | |
64 | struct klist_node *n); | |
65 | extern void klist_iter_exit(struct klist_iter *i); | |
66 | extern struct klist_node *klist_prev(struct klist_iter *i); | |
67 | extern struct klist_node *klist_next(struct klist_iter *i); | |
68 | ||
69 | #endif |