Commit 0ba69934 authored by Heinz Mauelshagen's avatar Heinz Mauelshagen Committed by Linus Torvalds

dm: bio list helpers

More bio_list helper functions for new targets (including dm-delay and
dm-loop) to manipulate lists of bios.
Signed-off-by: default avatarHeinz Mauelshagen <hjm@redhat.com>
Signed-off-by: default avatarBryn Reeves <breeves@redhat.com>
Signed-off-by: default avatarMilan Broz <mbroz@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent bf17ce3a
......@@ -8,17 +8,43 @@
#define DM_BIO_LIST_H
#include <linux/bio.h>
#include <linux/prefetch.h>
struct bio_list {
struct bio *head;
struct bio *tail;
};
static inline int bio_list_empty(const struct bio_list *bl)
{
return bl->head == NULL;
}
#define BIO_LIST_INIT { .head = NULL, .tail = NULL }
#define BIO_LIST(bl) \
struct bio_list bl = BIO_LIST_INIT
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 && ({ prefetch(bio->bi_next); 1; }); \
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;
......
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