include/linux/klist.h

   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