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Commit 86292abc authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

block: introduce bio helpers for converting to multipage bvec 



The following helpers are introduced for converting current users of
direct access to bvec table, and prepares for supporting multipage bvec:

	bio_pages_all()
	bio_first_bvec_all()
	bio_first_page_all()
	bio_last_bvec_all()

All are named as bio_*_all() to following bio_for_each_segment_all(),
they can only be used on bio of !bio_flagged(bio, BIO_CLONED), that means
the whole bvec table is covered.

Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 9b25bd03

include/linux/bio.h

+23 −0
Original line number Original line Diff line number Diff line
@@ -300,6 +300,29 @@ static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) 
		bv->bv_len = iter.bi_bvec_done;

		bv->bv_len = iter.bi_bvec_done;

}

}





static inline unsigned bio_pages_all(struct bio *bio)

{

	WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));

	return bio->bi_vcnt;

}



static inline struct bio_vec *bio_first_bvec_all(struct bio *bio)

{

	WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));

	return bio->bi_io_vec;

}



static inline struct page *bio_first_page_all(struct bio *bio)

{

	return bio_first_bvec_all(bio)->bv_page;

}



static inline struct bio_vec *bio_last_bvec_all(struct bio *bio)

{

	WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));

	return &bio->bi_io_vec[bio->bi_vcnt - 1];

}



enum bip_flags {

enum bip_flags {

	BIP_BLOCK_INTEGRITY	= 1 << 0, /* block layer owns integrity data */

	BIP_BLOCK_INTEGRITY	= 1 << 0, /* block layer owns integrity data */

	BIP_MAPPED_INTEGRITY	= 1 << 1, /* ref tag has been remapped */

	BIP_MAPPED_INTEGRITY	= 1 << 1, /* ref tag has been remapped */