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block: introduce mp_bvec_for_each_page() for iterating over page

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mp_bvec_for_each_segment() is a bit big for the iteration, so introduce
a light-weight helper for iterating over pages, then 32bytes stack
space can be saved.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2019-02-27 20:40:13 +08:00 committed by Jens Axboe
parent bbcbbd567c
commit 594b9a89af
1 changed files with 5 additions and 0 deletions
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include/linux/bvec.h
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@ -188,4 +188,9 @@ static inline void mp_bvec_last_segment(const struct bio_vec *bvec,
}
}
#define mp_bvec_for_each_page(pg, bv, i) \
for (i = (bv)->bv_offset / PAGE_SIZE; \
(i <= (((bv)->bv_offset + (bv)->bv_len - 1) / PAGE_SIZE)) && \
(pg = bvec_nth_page((bv)->bv_page, i)); i += 1)
#endif /* __LINUX_BVEC_ITER_H */