45 #define __bvec_iter_bvec(bvec, iter)	(&(bvec)[(iter).bi_idx])  argument
48 #define mp_bvec_iter_page(bvec, iter)				\  argument
49 	(__bvec_iter_bvec((bvec), (iter))->bv_page)
51 #define mp_bvec_iter_len(bvec, iter)				\  argument
52 	min((iter).bi_size,					\
53 	    __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done)
55 #define mp_bvec_iter_offset(bvec, iter)				\  argument
56 	(__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done)
58 #define mp_bvec_iter_page_idx(bvec, iter)			\  argument
59 	(mp_bvec_iter_offset((bvec), (iter)) / PAGE_SIZE)
61 #define mp_bvec_iter_bvec(bvec, iter)				\  argument
63 	.bv_page	= mp_bvec_iter_page((bvec), (iter)),	\
64 	.bv_len		= mp_bvec_iter_len((bvec), (iter)),	\
65 	.bv_offset	= mp_bvec_iter_offset((bvec), (iter)),	\
69  #define bvec_iter_offset(bvec, iter)				\  argument
70 	(mp_bvec_iter_offset((bvec), (iter)) % PAGE_SIZE)
72 #define bvec_iter_len(bvec, iter)				\  argument
73 	min_t(unsigned, mp_bvec_iter_len((bvec), (iter)),		\
74 	      PAGE_SIZE - bvec_iter_offset((bvec), (iter)))
76 #define bvec_iter_page(bvec, iter)				\  argument
77 	(mp_bvec_iter_page((bvec), (iter)) +			\
78 	 mp_bvec_iter_page_idx((bvec), (iter)))
80 #define bvec_iter_bvec(bvec, iter)				\  argument
82 	.bv_page	= bvec_iter_page((bvec), (iter)),	\
83 	.bv_len		= bvec_iter_len((bvec), (iter)),	\
84 	.bv_offset	= bvec_iter_offset((bvec), (iter)),	\
88 		struct bvec_iter *iter, unsigned bytes)  in bvec_iter_advance()  argument
90 	if (WARN_ONCE(bytes > iter->bi_size,  in bvec_iter_advance()
92 		iter->bi_size = 0;  in bvec_iter_advance()
97 		const struct bio_vec *cur = bv + iter->bi_idx;  in bvec_iter_advance()
98 		unsigned len = min3(bytes, iter->bi_size,  in bvec_iter_advance()
99 				    cur->bv_len - iter->bi_bvec_done);  in bvec_iter_advance()
102 		iter->bi_size -= len;  in bvec_iter_advance()
103 		iter->bi_bvec_done += len;  in bvec_iter_advance()
105 		if (iter->bi_bvec_done == cur->bv_len) {  in bvec_iter_advance()
106 			iter->bi_bvec_done = 0;  in bvec_iter_advance()
107 			iter->bi_idx++;  in bvec_iter_advance()
113 #define for_each_bvec(bvl, bio_vec, iter, start)			\  argument
114 	for (iter = (start);						\
115 	     (iter).bi_size &&						\
116 		((bvl = bvec_iter_bvec((bio_vec), (iter))), 1);	\
117 	     bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len))