Commit 1072c12d authored by Omar Sandoval's avatar Omar Sandoval Committed by David Sterba
Browse files

block: add bio_for_each_bvec_all() 



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: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: default avatarOmar Sandoval <osandov@fb.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 534cf531

.clang-format

+1 −0
Original line number Diff line number Diff line
@@ -80,6 +80,7 @@ ForEachMacros: 
  - 'ax25_uid_for_each'

  - '__bio_for_each_bvec'

  - 'bio_for_each_bvec'

  - 'bio_for_each_bvec_all'

  - 'bio_for_each_integrity_vec'

  - '__bio_for_each_segment'

  - 'bio_for_each_segment'

Documentation/block/biovecs.rst

+2 −0
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@@ -129,6 +129,7 @@ Usage of helpers: 
::



	bio_for_each_segment_all()

	bio_for_each_bvec_all()

	bio_first_bvec_all()

	bio_first_page_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_for_each_bvec()

	bio_for_each_bvec_all()

	rq_for_each_bvec()

include/linux/bio.h

+8 −0
Original line number Diff line number Diff line
@@ -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)			\

	__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)



static inline unsigned bio_segments(struct bio *bio)

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