| 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_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 | |
| 68 | #endif |