These helpers are introduced for converting current users of direct access to bvec table, and prepares for supporting multipage bvec.
Signed-off-by: Ming Lei <[email protected]> --- include/linux/bio.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/include/linux/bio.h b/include/linux/bio.h index 82f0c8fd7be8..3f314e17364a 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -300,6 +300,30 @@ static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) bv->bv_len = iter.bi_bvec_done; } +static inline unsigned bio_nr_pages(struct bio *bio) +{ + WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); + + return bio->bi_vcnt; +} + +static inline struct bio_vec *bio_first_bvec(struct bio *bio) +{ + WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); + return bio->bi_io_vec; +} + +static inline struct page *bio_first_page(struct bio *bio) +{ + return bio_first_bvec(bio)->bv_page; +} + +static inline struct bio_vec *bio_last_bvec(struct bio *bio) +{ + WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); + return &bio->bi_io_vec[bio->bi_vcnt - 1]; +} + enum bip_flags { BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ -- 2.9.5
