[linux-2.6-block.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 void bio_list_merge_head(struct bio_list *bl,
				       struct bio_list *bl2)
{
	if (!bl2->head)
		return;

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

	bl->head = bl2->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;

		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
2e93ccc1 KU	47	static inline void bio_list_merge_head(struct bio_list *bl,
	48	struct bio_list *bl2)
	49	{
	50	if (!bl2->head)
	51	return;
	52
	53	if (bl->head)
	54	bl2->tail->bi_next = bl->head;
	55	else
	56	bl->tail = bl2->tail;
	57
	58	bl->head = bl2->head;
	59	}
	60
1da177e4 LT	61	static inline struct bio bio_list_pop(struct bio_list bl)
	62	{
	63	struct bio *bio = bl->head;
	64
	65	if (bio) {
	66	bl->head = bl->head->bi_next;
	67	if (!bl->head)
	68	bl->tail = NULL;
	69
	70	bio->bi_next = NULL;
	71	}
	72
	73	return bio;
	74	}
	75
	76	static inline struct bio bio_list_get(struct bio_list bl)
	77	{
	78	struct bio *bio = bl->head;
	79
	80	bl->head = bl->tail = NULL;
	81
	82	return bio;
	83	}
	84
	85	#endif