Commit 594b9a89 authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe

block: introduce mp_bvec_for_each_page() for iterating over page

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: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent bbcbbd56
...@@ -188,4 +188,9 @@ static inline void mp_bvec_last_segment(const struct bio_vec *bvec, ...@@ -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 */ #endif /* __LINUX_BVEC_ITER_H */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment