53 #define __bvec_iter_bvec(bvec, iter)	(&(bvec)[(iter).bi_idx])  argument
55 #define bvec_iter_page(bvec, iter)				\  argument
56 	(__bvec_iter_bvec((bvec), (iter))->bv_page)
58 #define bvec_iter_len(bvec, iter)				\  argument
59 	min((iter).bi_size,					\
60 	    __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done)
62 #define bvec_iter_offset(bvec, iter)				\  argument
63 	(__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done)
65 #define bvec_iter_bvec(bvec, iter)				\  argument
67 	.bv_page	= bvec_iter_page((bvec), (iter)),	\
68 	.bv_len		= bvec_iter_len((bvec), (iter)),	\
69 	.bv_offset	= bvec_iter_offset((bvec), (iter)),	\
73 		struct bvec_iter *iter, unsigned bytes)  in bvec_iter_advance()  argument
75 	if (WARN_ONCE(bytes > iter->bi_size,  in bvec_iter_advance()
77 		iter->bi_size = 0;  in bvec_iter_advance()
82 		unsigned iter_len = bvec_iter_len(bv, *iter);  in bvec_iter_advance()
86 		iter->bi_size -= len;  in bvec_iter_advance()
87 		iter->bi_bvec_done += len;  in bvec_iter_advance()
88 		iter->bi_done += len;  in bvec_iter_advance()
90 		if (iter->bi_bvec_done == __bvec_iter_bvec(bv, *iter)->bv_len) {  in bvec_iter_advance()
91 			iter->bi_bvec_done = 0;  in bvec_iter_advance()
92 			iter->bi_idx++;  in bvec_iter_advance()
99 				     struct bvec_iter *iter,  in bvec_iter_rewind()  argument
103 		unsigned len = min(bytes, iter->bi_bvec_done);  in bvec_iter_rewind()
105 		if (iter->bi_bvec_done == 0) {  in bvec_iter_rewind()
106 			if (WARN_ONCE(iter->bi_idx == 0,  in bvec_iter_rewind()
111 			iter->bi_idx--;  in bvec_iter_rewind()
112 			iter->bi_bvec_done = __bvec_iter_bvec(bv, *iter)->bv_len;  in bvec_iter_rewind()
116 		iter->bi_size += len;  in bvec_iter_rewind()
117 		iter->bi_bvec_done -= len;  in bvec_iter_rewind()
122 #define for_each_bvec(bvl, bio_vec, iter, start)			\  argument
123 	for (iter = (start);						\
124 	     (iter).bi_size &&						\
125 		((bvl = bvec_iter_bvec((bio_vec), (iter))), 1);	\
126 	     bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len))