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| author | Ming Lei <ming.lei@redhat.com> | 2019-02-15 19:13:11 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-02-15 08:40:10 -0700 |
| commit | d18d91740ad22e9d7998884c4d80523d0ba95ddf (patch) | |
| tree | 1a894d857f4d7a407e21afa34e1ad02344a0efd5 /include/linux/blkdev.h | |
| parent | 3d75ca0adef4280650c6690a0c4702a74a6f3c95 (diff) | |
| download | lwn-d18d91740ad22e9d7998884c4d80523d0ba95ddf.tar.gz lwn-d18d91740ad22e9d7998884c4d80523d0ba95ddf.zip | |
block: introduce bio_for_each_bvec() and rq_for_each_bvec()
bio_for_each_bvec() is used for iterating over multi-page bvec for bio
split & merge code.
rq_for_each_bvec() can be used for drivers which may handle the
multi-page bvec directly, so far loop is one perfect use case.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 3603270cb82d..b6292d469ea4 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -792,6 +792,10 @@ struct req_iterator { __rq_for_each_bio(_iter.bio, _rq) \ bio_for_each_segment(bvl, _iter.bio, _iter.iter) +#define rq_for_each_bvec(bvl, _rq, _iter) \ + __rq_for_each_bio(_iter.bio, _rq) \ + bio_for_each_bvec(bvl, _iter.bio, _iter.iter) + #define rq_iter_last(bvec, _iter) \ (_iter.bio->bi_next == NULL && \ bio_iter_last(bvec, _iter.iter)) |