20 	if (!bio)  in __blk_recalc_rq_segments()
35 			if (high || highprv)  in __blk_recalc_rq_segments()
37 			if (cluster) {  in __blk_recalc_rq_segments()
38 				if (seg_size + bv->bv_len  in __blk_recalc_rq_segments()
41 				if (!BIOVEC_PHYS_MERGEABLE(bvprv, bv))  in __blk_recalc_rq_segments()
43 				if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bv))  in __blk_recalc_rq_segments()
51 			if (nr_phys_segs == 1 && seg_size >  in __blk_recalc_rq_segments()
63 	if (nr_phys_segs == 1 && seg_size > fbio->bi_seg_front_size)  in __blk_recalc_rq_segments()
65 	if (seg_size > bbio->bi_seg_back_size)  in __blk_recalc_rq_segments()
90 	if (!blk_queue_cluster(q))  in blk_phys_contig_segment()
93 	if (bio->bi_seg_back_size + nxt->bi_seg_front_size >  in blk_phys_contig_segment()
97 	if (!bio_has_data(bio))  in blk_phys_contig_segment()
100 	if (!BIOVEC_PHYS_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)))  in blk_phys_contig_segment()
104 	 * bio and nxt are contiguous in memory; check if the queue allows  in blk_phys_contig_segment()
107 	if (BIO_SEG_BOUNDARY(q, bio, nxt))  in blk_phys_contig_segment()
136 		if (bvprv && cluster) {  in blk_rq_map_sg()
137 			if (sg->length + nbytes > queue_max_segment_size(q))  in blk_rq_map_sg()
140 			if (!BIOVEC_PHYS_MERGEABLE(bvprv, bvec))  in blk_rq_map_sg()
142 			if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bvec))  in blk_rq_map_sg()
148 			if (!sg)  in blk_rq_map_sg()
152 				 * If the driver previously mapped a shorter  in blk_rq_map_sg()
172 	if (unlikely(rq->cmd_flags & REQ_COPY_USER) &&  in blk_rq_map_sg()
181 	if (q->dma_drain_size && q->dma_drain_needed(rq)) {  in blk_rq_map_sg()
182 		if (rq->cmd_flags & REQ_WRITE)  in blk_rq_map_sg()
195 	if (sg)  in blk_rq_map_sg()
208 	if (req->nr_phys_segments + nr_phys_segs > queue_max_segments(q))  in ll_new_hw_segment()
211 	if (bio_integrity(bio) && blk_integrity_merge_bio(q, req, bio))  in ll_new_hw_segment()
223 	if (req == q->last_merge)  in ll_new_hw_segment()
233 	if (unlikely(req->cmd_type == REQ_TYPE_BLOCK_PC))  in ll_back_merge_fn()
238 	if (blk_rq_sectors(req) + bio_sectors(bio) > max_sectors) {  in ll_back_merge_fn()
240 		if (req == q->last_merge)  in ll_back_merge_fn()
244 	if (!bio_flagged(req->biotail, BIO_SEG_VALID))  in ll_back_merge_fn()
246 	if (!bio_flagged(bio, BIO_SEG_VALID))  in ll_back_merge_fn()
257 	if (unlikely(req->cmd_type == REQ_TYPE_BLOCK_PC))  in ll_front_merge_fn()
263 	if (blk_rq_sectors(req) + bio_sectors(bio) > max_sectors) {  in ll_front_merge_fn()
265 		if (req == q->last_merge)  in ll_front_merge_fn()
269 	if (!bio_flagged(bio, BIO_SEG_VALID))  in ll_front_merge_fn()
271 	if (!bio_flagged(req->bio, BIO_SEG_VALID))  in ll_front_merge_fn()
285 	 * First check if the either of the requests are re-queued  in ll_merge_requests_fn()
286 	 * requests.  Can't merge them if they are.  in ll_merge_requests_fn()
288 	if (req->special || next->special)  in ll_merge_requests_fn()
294 	if ((blk_rq_sectors(req) + blk_rq_sectors(next)) > queue_max_sectors(q))  in ll_merge_requests_fn()
298 	if (blk_phys_contig_segment(q, req->biotail, next->bio)) {  in ll_merge_requests_fn()
299 		if (req->nr_phys_segments == 1)  in ll_merge_requests_fn()
301 		if (next->nr_phys_segments == 1)  in ll_merge_requests_fn()
306 	if (total_phys_segments > queue_max_segments(q))  in ll_merge_requests_fn()
309 	if (blk_integrity_rq(req) && blk_integrity_merge_rq(q, req, next))  in ll_merge_requests_fn()
331 	if (rq->cmd_flags & REQ_MIXED_MERGE)  in blk_rq_set_mixed_merge()
349 	if (blk_do_io_stat(req)) {  in blk_account_io_merge()
370 	if (!rq_mergeable(req) || !rq_mergeable(next))  in attempt_merge()
376 	if ((req->cmd_flags & REQ_DISCARD) != (next->cmd_flags & REQ_DISCARD))  in attempt_merge()
382 	if ((req->cmd_flags & REQ_SECURE) != (next->cmd_flags & REQ_SECURE))  in attempt_merge()
388 	if (blk_rq_pos(req) + blk_rq_sectors(req) != blk_rq_pos(next))  in attempt_merge()
391 	if (rq_data_dir(req) != rq_data_dir(next)  in attempt_merge()
397 	 * If we are allowed to merge, then append bio list  in attempt_merge()
402 	if (!ll_merge_requests_fn(q, req, next))  in attempt_merge()
406 	 * If failfast settings disagree or any of the two is already  in attempt_merge()
411 	if ((req->cmd_flags | next->cmd_flags) & REQ_MIXED_MERGE ||  in attempt_merge()
424 	if (time_after(req->start_time, next->start_time))  in attempt_merge()
440 	if (blk_rq_cpu_valid(next))  in attempt_merge()
453 	if (next)  in attempt_back_merge()
463 	if (prev)  in attempt_front_merge()
477 	if (!rq_mergeable(rq))  in blk_rq_merge_ok()
481 	if ((bio->bi_rw & REQ_DISCARD) != (rq->bio->bi_rw & REQ_DISCARD))  in blk_rq_merge_ok()
485 	if ((bio->bi_rw & REQ_SECURE) != (rq->bio->bi_rw & REQ_SECURE))  in blk_rq_merge_ok()
489 	if (bio_data_dir(bio) != rq_data_dir(rq))  in blk_rq_merge_ok()
493 	if (rq->rq_disk != bio->bi_bdev->bd_disk || rq->special)  in blk_rq_merge_ok()
497 	if (bio_integrity(bio) != blk_integrity_rq(rq))  in blk_rq_merge_ok()
505 	if (blk_rq_pos(rq) + blk_rq_sectors(rq) == bio->bi_sector)  in blk_try_merge()
507 	else if (blk_rq_pos(rq) - bio_sectors(bio) == bio->bi_sector)  in blk_try_merge()