[linux.git] / drivers / md / dm-bio-list.h

/*
 * 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>

struct bio_list {
	struct bio *head;
	struct bio *tail;
};

static inline void bio_list_init(struct bio_list *bl)
{
	bl->head = bl->tail = NULL;
}

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;

	if (bl->tail)
		bl->tail->bi_next = bl2->head;
	else
		bl->head = bl2->head;

	bl->tail = bl2->tail;
}

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;

		bio->bi_next = NULL;
	}

	return bio;
}

static inline struct bio *bio_list_get(struct bio_list *bl)
{
	struct bio *bio = bl->head;

	bl->head = bl->tail = NULL;

	return bio;
}

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) 2004 Red Hat UK Ltd.
	3	*
	4	* This file is released under the GPL.
	5	*/
	6
	7	#ifndef DM_BIO_LIST_H
	8	#define DM_BIO_LIST_H
	9
	10	#include <linux/bio.h>
	11
	12	struct bio_list {
	13	struct bio *head;
	14	struct bio *tail;
	15	};
	16
	17	static inline void bio_list_init(struct bio_list *bl)
	18	{
	19	bl->head = bl->tail = NULL;
	20	}
	21
	22	static inline void bio_list_add(struct bio_list bl, struct bio bio)
	23	{
	24	bio->bi_next = NULL;
	25
	26	if (bl->tail)
	27	bl->tail->bi_next = bio;
	28	else
	29	bl->head = bio;
	30
	31	bl->tail = bio;
	32	}
	33
	34	static inline void bio_list_merge(struct bio_list bl, struct bio_list bl2)
	35	{
233886dd	36	if (!bl2->head)
	37	return;
	38
1da177e4 LT	39	if (bl->tail)
	40	bl->tail->bi_next = bl2->head;
	41	else
	42	bl->head = bl2->head;
	43
	44	bl->tail = bl2->tail;
	45	}
	46
	47	static inline struct bio bio_list_pop(struct bio_list bl)
	48	{
	49	struct bio *bio = bl->head;
	50
	51	if (bio) {
	52	bl->head = bl->head->bi_next;
	53	if (!bl->head)
	54	bl->tail = NULL;
	55
	56	bio->bi_next = NULL;
	57	}
	58
	59	return bio;
	60	}
	61
	62	static inline struct bio bio_list_get(struct bio_list bl)
	63	{
	64	struct bio *bio = bl->head;
	65
	66	bl->head = bl->tail = NULL;
	67
	68	return bio;
	69	}
	70
	71	#endif