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block: add bio_for_each_bvec_all()

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An upcoming Btrfs fix needs to know the original size of a non-cloned
bios. Rather than accessing the bvec table directly, let's add a
bio_for_each_bvec_all() accessor.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Omar Sandoval 2020-04-16 14:46:11 -07:00 • committed by David Sterba
parent 534cf531cc
commit 1072c12d7d
3 changed files with 11 additions and 0 deletions
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1
.clang-format
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@ -80,6 +80,7 @@ ForEachMacros:
- 'ax25_uid_for_each' - 'ax25_uid_for_each'
- '__bio_for_each_bvec' - '__bio_for_each_bvec'
- 'bio_for_each_bvec' - 'bio_for_each_bvec'
- 'bio_for_each_bvec_all'
- 'bio_for_each_integrity_vec' - 'bio_for_each_integrity_vec'
- '__bio_for_each_segment' - '__bio_for_each_segment'
- 'bio_for_each_segment' - 'bio_for_each_segment'

2
Documentation/block/biovecs.rst
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@ -129,6 +129,7 @@ Usage of helpers:
:: ::
bio_for_each_segment_all() bio_for_each_segment_all()
bio_for_each_bvec_all()
bio_first_bvec_all() bio_first_bvec_all()
bio_first_page_all() bio_first_page_all()
bio_last_bvec_all() bio_last_bvec_all()
@ -143,4 +144,5 @@ Usage of helpers:
bio_vec' will contain a multi-page IO vector during the iteration:: bio_vec' will contain a multi-page IO vector during the iteration::
bio_for_each_bvec() bio_for_each_bvec()
bio_for_each_bvec_all()
rq_for_each_bvec() rq_for_each_bvec()

8
include/linux/bio.h
View file

@ -169,6 +169,14 @@ static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
#define bio_for_each_bvec(bvl, bio, iter) \ #define bio_for_each_bvec(bvl, bio, iter) \
__bio_for_each_bvec(bvl, bio, iter, (bio)->bi_iter) __bio_for_each_bvec(bvl, bio, iter, (bio)->bi_iter)
/*
* Iterate over all multi-page bvecs. Drivers shouldn't use this version for the
* same reasons as bio_for_each_segment_all().
*/
#define bio_for_each_bvec_all(bvl, bio, i) \
for (i = 0, bvl = bio_first_bvec_all(bio); \
i < (bio)->bi_vcnt; i++, bvl++) \
#define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
static inline unsigned bio_segments(struct bio *bio) static inline unsigned bio_segments(struct bio *bio)