dm: bio list add bio_list_add_head
Introduce a function that adds a bio to the head of the list for use by the patch that will support barriers. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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@ -52,6 +52,16 @@ static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
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bl->tail = bio;
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}
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static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
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{
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bio->bi_next = bl->head;
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bl->head = bio;
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if (!bl->tail)
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bl->tail = bio;
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}
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static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
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{
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if (!bl2->head)
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