tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
12struct bio_list {
13 struct bio *head;
14 struct bio *tail;
15};
16
17static inline void bio_list_init(struct bio_list *bl)
18{
19 bl->head = bl->tail = NULL;
20}
21
22static 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
34static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
35{
36 if (!bl2->head)
37 return;
38
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
47static 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
62static 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