Line data Source code
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 1 : 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_after(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_next(struct klist_iter *i);
67 1 :
68 : #endif
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