58 #define __bvec_iter_bvec(bvec, iter)	(&(bvec)[(iter).bi_idx])  argument
61 #define mp_bvec_iter_page(bvec, iter)				\  argument
62 	(__bvec_iter_bvec((bvec), (iter))->bv_page)
64 #define mp_bvec_iter_len(bvec, iter)				\  argument
65 	min((iter).bi_size,					\
66 	    __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done)
68 #define mp_bvec_iter_offset(bvec, iter)				\  argument
69 	(__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done)
71 #define mp_bvec_iter_page_idx(bvec, iter)			\  argument
72 	(mp_bvec_iter_offset((bvec), (iter)) / PAGE_SIZE)
74 #define mp_bvec_iter_bvec(bvec, iter)				\  argument
76 	.bv_page	= mp_bvec_iter_page((bvec), (iter)),	\
77 	.bv_len		= mp_bvec_iter_len((bvec), (iter)),	\
78 	.bv_offset	= mp_bvec_iter_offset((bvec), (iter)),	\
82  #define bvec_iter_offset(bvec, iter)				\  argument
83 	(mp_bvec_iter_offset((bvec), (iter)) % PAGE_SIZE)
85 #define bvec_iter_len(bvec, iter)				\  argument
86 	min_t(unsigned, mp_bvec_iter_len((bvec), (iter)),		\
87 	      PAGE_SIZE - bvec_iter_offset((bvec), (iter)))
89 #define bvec_iter_page(bvec, iter)				\  argument
90 	(mp_bvec_iter_page((bvec), (iter)) +			\
91 	 mp_bvec_iter_page_idx((bvec), (iter)))
93 #define bvec_iter_bvec(bvec, iter)				\  argument
95 	.bv_page	= bvec_iter_page((bvec), (iter)),	\
96 	.bv_len		= bvec_iter_len((bvec), (iter)),	\
97 	.bv_offset	= bvec_iter_offset((bvec), (iter)),	\
101 		struct bvec_iter *iter, unsigned bytes)  in bvec_iter_advance()  argument
103 	unsigned int idx = iter->bi_idx;  in bvec_iter_advance()
105 	if (WARN_ONCE(bytes > iter->bi_size,  in bvec_iter_advance()
107 		iter->bi_size = 0;  in bvec_iter_advance()
111 	iter->bi_size -= bytes;  in bvec_iter_advance()
112 	bytes += iter->bi_bvec_done;  in bvec_iter_advance()
119 	iter->bi_idx = idx;  in bvec_iter_advance()
120 	iter->bi_bvec_done = bytes;  in bvec_iter_advance()
124 static inline void bvec_iter_skip_zero_bvec(struct bvec_iter *iter)  in bvec_iter_skip_zero_bvec()  argument
126 	iter->bi_bvec_done = 0;  in bvec_iter_skip_zero_bvec()
127 	iter->bi_idx++;  in bvec_iter_skip_zero_bvec()
130 #define for_each_bvec(bvl, bio_vec, iter, start)			\  argument
131 	for (iter = (start);						\
132 	     (iter).bi_size &&						\
133 		((bvl = bvec_iter_bvec((bio_vec), (iter))), 1);	\
134 	     (bvl).bv_len ? (void)bvec_iter_advance((bio_vec), &(iter),	\
135 		     (bvl).bv_len) : bvec_iter_skip_zero_bvec(&(iter)))