109 static inline bool is_partial_io(struct bio_vec *bvec)  in is_partial_io()  argument
111 	return bvec->bv_len != PAGE_SIZE;  in is_partial_io()
138 static void update_position(u32 *index, int *offset, struct bio_vec *bvec)  in update_position()  argument
140 	if (*offset + bvec->bv_len >= PAGE_SIZE)  in update_position()
142 	*offset = (*offset + bvec->bv_len) % PAGE_SIZE;  in update_position()
175 static void handle_zero_page(struct bio_vec *bvec)  in handle_zero_page()  argument
177 	struct page *page = bvec->bv_page;  in handle_zero_page()
181 	if (is_partial_io(bvec))  in handle_zero_page()
182 		memset(user_mem + bvec->bv_offset, 0, bvec->bv_len);  in handle_zero_page()
598 static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,  in zram_bvec_read()  argument
605 	page = bvec->bv_page;  in zram_bvec_read()
611 		handle_zero_page(bvec);  in zram_bvec_read()
616 	if (is_partial_io(bvec))  in zram_bvec_read()
621 	if (!is_partial_io(bvec))  in zram_bvec_read()
635 	if (is_partial_io(bvec))  in zram_bvec_read()
636 		memcpy(user_mem + bvec->bv_offset, uncmem + offset,  in zram_bvec_read()
637 				bvec->bv_len);  in zram_bvec_read()
643 	if (is_partial_io(bvec))  in zram_bvec_read()
648 static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,  in zram_bvec_write()  argument
660 	page = bvec->bv_page;  in zram_bvec_write()
661 	if (is_partial_io(bvec)) {  in zram_bvec_write()
679 	if (is_partial_io(bvec)) {  in zram_bvec_write()
680 		memcpy(uncmem + offset, user_mem + bvec->bv_offset,  in zram_bvec_write()
681 		       bvec->bv_len);  in zram_bvec_write()
703 	if (!is_partial_io(bvec)) {  in zram_bvec_write()
716 		if (is_partial_io(bvec))  in zram_bvec_write()
739 	if ((clen == PAGE_SIZE) && !is_partial_io(bvec)) {  in zram_bvec_write()
768 	if (is_partial_io(bvec))  in zram_bvec_write()
812 static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,  in zram_bvec_rw()  argument
818 	generic_start_io_acct(rw, bvec->bv_len >> SECTOR_SHIFT,  in zram_bvec_rw()
823 		ret = zram_bvec_read(zram, bvec, index, offset);  in zram_bvec_rw()
826 		ret = zram_bvec_write(zram, bvec, index, offset);  in zram_bvec_rw()
845 	struct bio_vec bvec;  in __zram_make_request()  local
859 	bio_for_each_segment(bvec, bio, iter) {  in __zram_make_request()
862 		if (bvec.bv_len > max_transfer_size) {  in __zram_make_request()
869 			bv.bv_page = bvec.bv_page;  in __zram_make_request()
871 			bv.bv_offset = bvec.bv_offset;  in __zram_make_request()
876 			bv.bv_len = bvec.bv_len - max_transfer_size;  in __zram_make_request()
881 			if (zram_bvec_rw(zram, &bvec, index, offset, rw) < 0)  in __zram_make_request()
884 		update_position(&index, &offset, &bvec);  in __zram_make_request()