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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>

#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;

      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 /* CONFIG_BLOCK */
#endif

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