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/completion.h> 17 #include <linux/kref.h> 18 #include <linux/list.h> 19 20 struct klist_node; 21 struct klist { 22 spinlock_t k_lock; 23 struct list_head k_list; 24 void (*get)(struct klist_node *); 25 void (*put)(struct klist_node *); 26 }; 27 28 #define KLIST_INIT(_name, _get, _put) \ 29 { .k_lock = __SPIN_LOCK_UNLOCKED(_name.k_lock), \ 30 .k_list = LIST_HEAD_INIT(_name.k_list), \ 31 .get = _get, \ 32 .put = _put, } 33 34 #define DEFINE_KLIST(_name, _get, _put) \ 35 struct klist _name = KLIST_INIT(_name, _get, _put) 36 37 extern void klist_init(struct klist *k, void (*get)(struct klist_node *), 38 void (*put)(struct klist_node *)); 39 40 struct klist_node { 41 void *n_klist; /* never access directly */ 42 struct list_head n_node; 43 struct kref n_ref; 44 struct completion n_removed; 45 }; 46 47 extern void klist_add_tail(struct klist_node *n, struct klist *k); 48 extern void klist_add_head(struct klist_node *n, struct klist *k); 49 extern void klist_add_after(struct klist_node *n, struct klist_node *pos); 50 extern void klist_add_before(struct klist_node *n, struct klist_node *pos); 51 52 extern void klist_del(struct klist_node *n); 53 extern void klist_remove(struct klist_node *n); 54 55 extern int klist_node_attached(struct klist_node *n); 56 57 58 struct klist_iter { 59 struct klist *i_klist; 60 struct klist_node *i_cur; 61 }; 62 63 64 extern void klist_iter_init(struct klist *k, struct klist_iter *i); 65 extern void klist_iter_init_node(struct klist *k, struct klist_iter *i, 66 struct klist_node *n); 67 extern void klist_iter_exit(struct klist_iter *i); 68 extern struct klist_node *klist_next(struct klist_iter *i); 69 70 #endif 71