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| author | Omar Sandoval <osandov@fb.com> | 2020-04-16 14:46:11 -0700 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-05-25 11:25:24 +0200 |
| commit | 1072c12d7d58b5512b6c05c2268f57d32f1ab76c (patch) | |
| tree | 45deabef6738854caebcdada4773a68c3bae35b6 | |
| parent | 534cf531ccf6331b6e63a054f2ceb8e1ccff1ec9 (diff) | |
| download | lwn-1072c12d7d58b5512b6c05c2268f57d32f1ab76c.tar.gz lwn-1072c12d7d58b5512b6c05c2268f57d32f1ab76c.zip | |
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: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | .clang-format | 1 | ||||
| -rw-r--r-- | Documentation/block/biovecs.rst | 2 | ||||
| -rw-r--r-- | include/linux/bio.h | 8 |
3 files changed, 11 insertions, 0 deletions
diff --git a/.clang-format b/.clang-format index e92e6dd1780d..a0a96088c74f 100644 --- a/.clang-format +++ b/.clang-format @@ -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' diff --git a/Documentation/block/biovecs.rst b/Documentation/block/biovecs.rst index ad303a2569d3..36771a131b56 100644 --- a/Documentation/block/biovecs.rst +++ b/Documentation/block/biovecs.rst @@ -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() diff --git a/include/linux/bio.h b/include/linux/bio.h index a0ee494a6329..8e23f51ccfa4 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -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) |