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dm: bio list helpers

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More bio_list helper functions for new targets (including dm-delay and
dm-loop) to manipulate lists of bios.

Signed-off-by: Heinz Mauelshagen <hjm@redhat.com>
Signed-off-by: Bryn Reeves <breeves@redhat.com>
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Heinz Mauelshagen 2007-05-09 02:33:05 -07:00 committed by Linus Torvalds
parent bf17ce3a60
commit 0ba699347e
1 changed files with 26 additions and 0 deletions
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26
drivers/md/dm-bio-list.h
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@ -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;