diff -Naur linux-4.5-rc2/block/blk-merge.c linux-4.5-rc2-patched/block/blk-merge.c
--- linux-4.5-rc2/block/blk-merge.c	2016-02-01 11:12:16.000000000 +0900
+++ linux-4.5-rc2-patched/block/blk-merge.c	2016-02-02 15:28:07.626107509 +0900
@@ -504,7 +504,7 @@
 	    integrity_req_gap_back_merge(req, bio))
 		return 0;
 	if (blk_rq_sectors(req) + bio_sectors(bio) >
-	    blk_rq_get_max_sectors(req)) {
+	    blk_rq_get_max_sectors(req, blk_rq_pos(req))) {
 		req->cmd_flags |= REQ_NOMERGE;
 		if (req == q->last_merge)
 			q->last_merge = NULL;
@@ -528,7 +528,7 @@
 	    integrity_req_gap_front_merge(req, bio))
 		return 0;
 	if (blk_rq_sectors(req) + bio_sectors(bio) >
-	    blk_rq_get_max_sectors(req)) {
+	    blk_rq_get_max_sectors(req, bio->bi_iter.bi_sector)) {
 		req->cmd_flags |= REQ_NOMERGE;
 		if (req == q->last_merge)
 			q->last_merge = NULL;
@@ -574,7 +574,7 @@
 	 * Will it become too large?
 	 */
 	if ((blk_rq_sectors(req) + blk_rq_sectors(next)) >
-	    blk_rq_get_max_sectors(req))
+	    blk_rq_get_max_sectors(req, blk_rq_pos(req)))
 		return 0;
 
 	total_phys_segments = req->nr_phys_segments + next->nr_phys_segments;
diff -Naur linux-4.5-rc2/include/linux/blkdev.h linux-4.5-rc2-patched/include/linux/blkdev.h
--- linux-4.5-rc2/include/linux/blkdev.h	2016-02-01 11:12:16.000000000 +0900
+++ linux-4.5-rc2-patched/include/linux/blkdev.h	2016-02-02 15:26:39.313283902 +0900
@@ -888,7 +888,8 @@
 			(offset & (q->limits.chunk_sectors - 1));
 }
 
-static inline unsigned int blk_rq_get_max_sectors(struct request *rq)
+static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
+					       sector_t offset)
 {
 	struct request_queue *q = rq->q;
 
@@ -898,7 +899,7 @@
 	if (!q->limits.chunk_sectors || (rq->cmd_flags & REQ_DISCARD))
 		return blk_queue_get_max_sectors(q, rq->cmd_flags);
 
-	return min(blk_max_size_offset(q, blk_rq_pos(rq)),
+	return min(blk_max_size_offset(q, offset),
 			blk_queue_get_max_sectors(q, rq->cmd_flags));
 }