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Linux kernel mirror (for testing)
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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
12#ifdef CONFIG_BLOCK
13
14struct bio_list {
15 struct bio *head;
16 struct bio *tail;
17};
18
19static inline int bio_list_empty(const struct bio_list *bl)
20{
21 return bl->head == NULL;
22}
23
24static inline void bio_list_init(struct bio_list *bl)
25{
26 bl->head = bl->tail = NULL;
27}
28
29#define bio_list_for_each(bio, bl) \
30 for (bio = (bl)->head; bio; bio = bio->bi_next)
31
32static inline unsigned bio_list_size(const struct bio_list *bl)
33{
34 unsigned sz = 0;
35 struct bio *bio;
36
37 bio_list_for_each(bio, bl)
38 sz++;
39
40 return sz;
41}
42
43static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
44{
45 bio->bi_next = NULL;
46
47 if (bl->tail)
48 bl->tail->bi_next = bio;
49 else
50 bl->head = bio;
51
52 bl->tail = bio;
53}
54
55static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
56{
57 if (!bl2->head)
58 return;
59
60 if (bl->tail)
61 bl->tail->bi_next = bl2->head;
62 else
63 bl->head = bl2->head;
64
65 bl->tail = bl2->tail;
66}
67
68static inline void bio_list_merge_head(struct bio_list *bl,
69 struct bio_list *bl2)
70{
71 if (!bl2->head)
72 return;
73
74 if (bl->head)
75 bl2->tail->bi_next = bl->head;
76 else
77 bl->tail = bl2->tail;
78
79 bl->head = bl2->head;
80}
81
82static inline struct bio *bio_list_pop(struct bio_list *bl)
83{
84 struct bio *bio = bl->head;
85
86 if (bio) {
87 bl->head = bl->head->bi_next;
88 if (!bl->head)
89 bl->tail = NULL;
90
91 bio->bi_next = NULL;
92 }
93
94 return bio;
95}
96
97static inline struct bio *bio_list_get(struct bio_list *bl)
98{
99 struct bio *bio = bl->head;
100
101 bl->head = bl->tail = NULL;
102
103 return bio;
104}
105
106#endif /* CONFIG_BLOCK */
107#endif