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