root/include/linux/klist.h

INCLUDED FROM

/*
 *      klist.h - Some generic list helpers, extending struct list_head a bit.
 *
 *      Implementations are found in lib/klist.c
 *
 *
 *      Copyright (C) 2005 Patrick Mochel
 *
 *      This file is rleased under the GPL v2.
 */

#ifndef _LINUX_KLIST_H
#define _LINUX_KLIST_H

#include <linux/spinlock.h>
#include <linux/kref.h>
#include <linux/list.h>

struct klist_node;
struct klist {
        spinlock_t              k_lock;
        struct list_head        k_list;
        void                    (*get)(struct klist_node *);
        void                    (*put)(struct klist_node *);
} __attribute__ ((aligned (sizeof(void *))));

#define KLIST_INIT(_name, _get, _put)                                   \
        { .k_lock       = __SPIN_LOCK_UNLOCKED(_name.k_lock),           \
          .k_list       = LIST_HEAD_INIT(_name.k_list),                 \
          .get          = _get,                                         \
          .put          = _put, }

#define DEFINE_KLIST(_name, _get, _put)                                 \
        struct klist _name = KLIST_INIT(_name, _get, _put)

extern void klist_init(struct klist *k, void (*get)(struct klist_node *),
                       void (*put)(struct klist_node *));

struct klist_node {
        void                    *n_klist;       /* never access directly */
        struct list_head        n_node;
        struct kref             n_ref;
};

extern void klist_add_tail(struct klist_node *n, struct klist *k);
extern void klist_add_head(struct klist_node *n, struct klist *k);
extern void klist_add_behind(struct klist_node *n, struct klist_node *pos);
extern void klist_add_before(struct klist_node *n, struct klist_node *pos);

extern void klist_del(struct klist_node *n);
extern void klist_remove(struct klist_node *n);

extern int klist_node_attached(struct klist_node *n);


struct klist_iter {
        struct klist            *i_klist;
        struct klist_node       *i_cur;
};


extern void klist_iter_init(struct klist *k, struct klist_iter *i);
extern void klist_iter_init_node(struct klist *k, struct klist_iter *i,
                                 struct klist_node *n);
extern void klist_iter_exit(struct klist_iter *i);
extern struct klist_node *klist_next(struct klist_iter *i);

#endif