/*
* Copyright (C) 2004 Red Hat UK Ltd.
*
* This file is released under the GPL.
*/
#ifndef DM_BIO_LIST_H
#define DM_BIO_LIST_H
#include <linux/bio.h>
#ifdef CONFIG_BLOCK
struct bio_list {
struct bio *head;
struct bio *tail;
};
static inline int bio_list_empty(const struct bio_list *bl)
{
return bl->head == NULL;
}
static inline void bio_list_init(struct bio_list *bl)
bl->head = bl->tail = NULL;
#define bio_list_for_each(bio, bl) \
for (bio = (bl)->head; bio; bio = bio->bi_next)
static inline unsigned bio_list_size(const struct bio_list *bl)
unsigned sz = 0;
struct bio *bio;
bio_list_for_each(bio, bl)
sz++;
return sz;
static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
bio->bi_next = NULL;
if (bl->tail)
bl->tail->bi_next = bio;
else
bl->head = bio;
bl->tail = bio;
static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
if (!bl2->head)
return;
bl->tail->bi_next = bl2->head;
bl->head = bl2->head;
bl->tail = bl2->tail;
static inline void bio_list_merge_head(struct bio_list *bl,
struct bio_list *bl2)
if (bl->head)
bl2->tail->bi_next = bl->head;
static inline struct bio *bio_list_pop(struct bio_list *bl)
struct bio *bio = bl->head;
if (bio) {
bl->head = bl->head->bi_next;
if (!bl->head)
bl->tail = NULL;
return bio;
static inline struct bio *bio_list_get(struct bio_list *bl)
#endif /* CONFIG_BLOCK */
#endif