/* vi: set sw=4 ts=4: */#if !defined(_BLKID_LIST_H) && !defined(LIST_HEAD)#define _BLKID_LIST_H#ifdef __cplusplusextern "C" {#endif/* * Simple doubly linked list implementation. * * Some of the internal functions ("__xxx") are useful when * manipulating whole lists rather than single entries, as * sometimes we already know the next/prev entries and we can * generate better code by using them directly rather than * using the generic single-entry routines. */struct list_head {	struct list_head *next, *prev;};#define LIST_HEAD_INIT(name) { &(name), &(name) }#define LIST_HEAD(name) \	struct list_head name = LIST_HEAD_INIT(name)#define INIT_LIST_HEAD(ptr) do { \	(ptr)->next = (ptr); (ptr)->prev = (ptr); \} while (0)void __list_add(struct list_head * add, struct list_head * prev,	struct list_head * next);void list_add(struct list_head *add, struct list_head *head);void list_add_tail(struct list_head *add, struct list_head *head);void __list_del(struct list_head * prev, struct list_head * next);void list_del(struct list_head *entry);void list_del_init(struct list_head *entry);int list_empty(struct list_head *head);void list_splice(struct list_head *list, struct list_head *head);/** * list_entry - get the struct for this entry * @ptr:	the &struct list_head pointer. * @type:	the type of the struct this is embedded in. * @member:	the name of the list_struct within the struct. */#define list_entry(ptr, type, member) \	((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))/** * list_for_each - iterate over elements in a list * @pos:	the &struct list_head to use as a loop counter. * @head:	the head for your list. */#define list_for_each(pos, head) \	for (pos = (head)->next; pos != (head); pos = pos->next)/** * list_for_each_safe - iterate over elements in a list, but don't dereference *                      pos after the body is done (in case it is freed) * @pos:	the &struct list_head to use as a loop counter. * @pnext:	the &struct list_head to use as a pointer to the next item. * @head:	the head for your list (not included in iteration). */#define list_for_each_safe(pos, pnext, head) \	for (pos = (head)->next, pnext = pos->next; pos != (head); \	     pos = pnext, pnext = pos->next)#ifdef __cplusplus}#endif#endif /* _BLKID_LIST_H */