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| author | Heinz Mauelshagen <hjm@redhat.com> | 2007-05-09 02:33:05 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 12:30:47 -0700 |
| commit | 0ba699347e96b5468b42b3decf1f381abbf99652 (patch) | |
| tree | 7ec0aeedd92ffee6c2a8ecda60e8f85106c28c04 /drivers/md | |
| parent | bf17ce3a604d943f29bf1bc1a66a4e0d2ad4ec96 (diff) | |
| download | linux-stable-0ba699347e96b5468b42b3decf1f381abbf99652.tar.gz linux-stable-0ba699347e96b5468b42b3decf1f381abbf99652.tar.bz2 linux-stable-0ba699347e96b5468b42b3decf1f381abbf99652.zip | |
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: 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>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-bio-list.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/md/dm-bio-list.h b/drivers/md/dm-bio-list.h index da4349649f7f..c6be88826fae 100644 --- a/drivers/md/dm-bio-list.h +++ b/drivers/md/dm-bio-list.h @@ -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; |