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

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

include/linux/bvec.h

+5 −0
Original line number Diff line number Diff line
@@ -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 */