359 static int req_gap_to_prev(struct request *req, struct request *next)  in req_gap_to_prev()  argument
364 				next->bio->bi_io_vec[0].bv_offset);  in req_gap_to_prev()
368 				struct request *next)  in ll_merge_requests_fn()  argument
372 		req->biotail->bi_seg_back_size + next->bio->bi_seg_front_size;  in ll_merge_requests_fn()
378 	if (req_no_special_merge(req) || req_no_special_merge(next))  in ll_merge_requests_fn()
382 	    req_gap_to_prev(req, next))  in ll_merge_requests_fn()
388 	if ((blk_rq_sectors(req) + blk_rq_sectors(next)) >  in ll_merge_requests_fn()
392 	total_phys_segments = req->nr_phys_segments + next->nr_phys_segments;  in ll_merge_requests_fn()
393 	if (blk_phys_contig_segment(q, req->biotail, next->bio)) {  in ll_merge_requests_fn()
396 		if (next->nr_phys_segments == 1)  in ll_merge_requests_fn()
397 			next->biotail->bi_seg_back_size = seg_size;  in ll_merge_requests_fn()
404 	if (blk_integrity_merge_rq(q, req, next) == false)  in ll_merge_requests_fn()
463 			  struct request *next)  in attempt_merge()  argument
465 	if (!rq_mergeable(req) || !rq_mergeable(next))  in attempt_merge()
468 	if (!blk_check_merge_flags(req->cmd_flags, next->cmd_flags))  in attempt_merge()
474 	if (blk_rq_pos(req) + blk_rq_sectors(req) != blk_rq_pos(next))  in attempt_merge()
477 	if (rq_data_dir(req) != rq_data_dir(next)  in attempt_merge()
478 	    || req->rq_disk != next->rq_disk  in attempt_merge()
479 	    || req_no_special_merge(next))  in attempt_merge()
483 	    !blk_write_same_mergeable(req->bio, next->bio))  in attempt_merge()
492 	if (!ll_merge_requests_fn(q, req, next))  in attempt_merge()
501 	if ((req->cmd_flags | next->cmd_flags) & REQ_MIXED_MERGE ||  in attempt_merge()
503 	    (next->cmd_flags & REQ_FAILFAST_MASK)) {  in attempt_merge()
505 		blk_rq_set_mixed_merge(next);  in attempt_merge()
514 	if (time_after(req->start_time, next->start_time))  in attempt_merge()
515 		req->start_time = next->start_time;  in attempt_merge()
517 	req->biotail->bi_next = next->bio;  in attempt_merge()
518 	req->biotail = next->biotail;  in attempt_merge()
520 	req->__data_len += blk_rq_bytes(next);  in attempt_merge()
522 	elv_merge_requests(q, req, next);  in attempt_merge()
527 	blk_account_io_merge(next);  in attempt_merge()
529 	req->ioprio = ioprio_best(req->ioprio, next->ioprio);  in attempt_merge()
530 	if (blk_rq_cpu_valid(next))  in attempt_merge()
531 		req->cpu = next->cpu;  in attempt_merge()
534 	next->bio = NULL;  in attempt_merge()
535 	__blk_put_request(q, next);  in attempt_merge()
541 	struct request *next = elv_latter_request(q, rq);  in attempt_back_merge()  local
543 	if (next)  in attempt_back_merge()
544 		return attempt_merge(q, rq, next);  in attempt_back_merge()
560 			  struct request *next)  in blk_attempt_req_merge()  argument
562 	return attempt_merge(q, rq, next);  in blk_attempt_req_merge()