diff --git a/block/Kconfig b/block/Kconfig
index af5f70b07037..e657e2bd8059 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -161,8 +161,6 @@ config BLK_WBT_MQ
 	depends on BLK_WBT
 	help
 	Enable writeback throttling by default on multiqueue devices.
-	Multiqueue currently doesn't have support for IO scheduling,
-	enabling this option is recommended.
 
 config BLK_DEBUG_FS
 	bool "Block layer debugging information in debugfs"
diff --git a/block/blk-core.c b/block/blk-core.c
index 10c08ac50697..062efdedc994 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -116,8 +116,8 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
 	rq->__sector = (sector_t) -1;
 	INIT_HLIST_NODE(&rq->hash);
 	RB_CLEAR_NODE(&rq->rb_node);
-	rq->tag = -1;
-	rq->internal_tag = -1;
+	rq->tag = BLK_MQ_NO_TAG;
+	rq->internal_tag = BLK_MQ_NO_TAG;
 	rq->start_time_ns = ktime_get_ns();
 	rq->part = NULL;
 	refcount_set(&rq->ref, 1);
@@ -643,162 +643,6 @@ void blk_put_request(struct request *req)
 }
 EXPORT_SYMBOL(blk_put_request);
 
-static void blk_account_io_merge_bio(struct request *req)
-{
-	if (!blk_do_io_stat(req))
-		return;
-
-	part_stat_lock();
-	part_stat_inc(req->part, merges[op_stat_group(req_op(req))]);
-	part_stat_unlock();
-}
-
-bool bio_attempt_back_merge(struct request *req, struct bio *bio,
-		unsigned int nr_segs)
-{
-	const int ff = bio->bi_opf & REQ_FAILFAST_MASK;
-
-	if (!ll_back_merge_fn(req, bio, nr_segs))
-		return false;
-
-	trace_block_bio_backmerge(req->q, req, bio);
-	rq_qos_merge(req->q, req, bio);
-
-	if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
-		blk_rq_set_mixed_merge(req);
-
-	req->biotail->bi_next = bio;
-	req->biotail = bio;
-	req->__data_len += bio->bi_iter.bi_size;
-
-	bio_crypt_free_ctx(bio);
-
-	blk_account_io_merge_bio(req);
-	return true;
-}
-
-bool bio_attempt_front_merge(struct request *req, struct bio *bio,
-		unsigned int nr_segs)
-{
-	const int ff = bio->bi_opf & REQ_FAILFAST_MASK;
-
-	if (!ll_front_merge_fn(req, bio, nr_segs))
-		return false;
-
-	trace_block_bio_frontmerge(req->q, req, bio);
-	rq_qos_merge(req->q, req, bio);
-
-	if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
-		blk_rq_set_mixed_merge(req);
-
-	bio->bi_next = req->bio;
-	req->bio = bio;
-
-	req->__sector = bio->bi_iter.bi_sector;
-	req->__data_len += bio->bi_iter.bi_size;
-
-	bio_crypt_do_front_merge(req, bio);
-
-	blk_account_io_merge_bio(req);
-	return true;
-}
-
-bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
-		struct bio *bio)
-{
-	unsigned short segments = blk_rq_nr_discard_segments(req);
-
-	if (segments >= queue_max_discard_segments(q))
-		goto no_merge;
-	if (blk_rq_sectors(req) + bio_sectors(bio) >
-	    blk_rq_get_max_sectors(req, blk_rq_pos(req)))
-		goto no_merge;
-
-	rq_qos_merge(q, req, bio);
-
-	req->biotail->bi_next = bio;
-	req->biotail = bio;
-	req->__data_len += bio->bi_iter.bi_size;
-	req->nr_phys_segments = segments + 1;
-
-	blk_account_io_merge_bio(req);
-	return true;
-no_merge:
-	req_set_nomerge(q, req);
-	return false;
-}
-
-/**
- * blk_attempt_plug_merge - try to merge with %current's plugged list
- * @q: request_queue new bio is being queued at
- * @bio: new bio being queued
- * @nr_segs: number of segments in @bio
- * @same_queue_rq: pointer to &struct request that gets filled in when
- * another request associated with @q is found on the plug list
- * (optional, may be %NULL)
- *
- * Determine whether @bio being queued on @q can be merged with a request
- * on %current's plugged list.  Returns %true if merge was successful,
- * otherwise %false.
- *
- * Plugging coalesces IOs from the same issuer for the same purpose without
- * going through @q->queue_lock.  As such it's more of an issuing mechanism
- * than scheduling, and the request, while may have elvpriv data, is not
- * added on the elevator at this point.  In addition, we don't have
- * reliable access to the elevator outside queue lock.  Only check basic
- * merging parameters without querying the elevator.
- *
- * Caller must ensure !blk_queue_nomerges(q) beforehand.
- */
-bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
-		unsigned int nr_segs, struct request **same_queue_rq)
-{
-	struct blk_plug *plug;
-	struct request *rq;
-	struct list_head *plug_list;
-
-	plug = blk_mq_plug(q, bio);
-	if (!plug)
-		return false;
-
-	plug_list = &plug->mq_list;
-
-	list_for_each_entry_reverse(rq, plug_list, queuelist) {
-		bool merged = false;
-
-		if (rq->q == q && same_queue_rq) {
-			/*
-			 * Only blk-mq multiple hardware queues case checks the
-			 * rq in the same queue, there should be only one such
-			 * rq in a queue
-			 **/
-			*same_queue_rq = rq;
-		}
-
-		if (rq->q != q || !blk_rq_merge_ok(rq, bio))
-			continue;
-
-		switch (blk_try_merge(rq, bio)) {
-		case ELEVATOR_BACK_MERGE:
-			merged = bio_attempt_back_merge(rq, bio, nr_segs);
-			break;
-		case ELEVATOR_FRONT_MERGE:
-			merged = bio_attempt_front_merge(rq, bio, nr_segs);
-			break;
-		case ELEVATOR_DISCARD_MERGE:
-			merged = bio_attempt_discard_merge(q, rq, bio);
-			break;
-		default:
-			break;
-		}
-
-		if (merged)
-			return true;
-	}
-
-	return false;
-}
-
 static void handle_bad_sector(struct bio *bio, sector_t maxsector)
 {
 	char b[BDEVNAME_SIZE];
diff --git a/block/blk-map.c b/block/blk-map.c
index 6e804892d5ec..be118926ccf4 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -12,7 +12,8 @@
 #include "blk.h"
 
 struct bio_map_data {
-	int is_our_pages;
+	bool is_our_pages : 1;
+	bool is_null_mapped : 1;
 	struct iov_iter iter;
 	struct iovec iov[];
 };
@@ -108,7 +109,7 @@ static int bio_uncopy_user(struct bio *bio)
 	struct bio_map_data *bmd = bio->bi_private;
 	int ret = 0;
 
-	if (!bio_flagged(bio, BIO_NULL_MAPPED)) {
+	if (!bmd->is_null_mapped) {
 		/*
 		 * if we're in a workqueue, the request is orphaned, so
 		 * don't copy into a random user address space, just free
@@ -126,24 +127,12 @@ static int bio_uncopy_user(struct bio *bio)
 	return ret;
 }
 
-/**
- *	bio_copy_user_iov	-	copy user data to bio
- *	@q:		destination block queue
- *	@map_data:	pointer to the rq_map_data holding pages (if necessary)
- *	@iter:		iovec iterator
- *	@gfp_mask:	memory allocation flags
- *
- *	Prepares and returns a bio for indirect user io, bouncing data
- *	to/from kernel pages as necessary. Must be paired with
- *	call bio_uncopy_user() on io completion.
- */
-static struct bio *bio_copy_user_iov(struct request_queue *q,
-		struct rq_map_data *map_data, struct iov_iter *iter,
-		gfp_t gfp_mask)
+static int bio_copy_user_iov(struct request *rq, struct rq_map_data *map_data,
+		struct iov_iter *iter, gfp_t gfp_mask)
 {
 	struct bio_map_data *bmd;
 	struct page *page;
-	struct bio *bio;
+	struct bio *bio, *bounce_bio;
 	int i = 0, ret;
 	int nr_pages;
 	unsigned int len = iter->count;
@@ -151,14 +140,14 @@ static struct bio *bio_copy_user_iov(struct request_queue *q,
 
 	bmd = bio_alloc_map_data(iter, gfp_mask);
 	if (!bmd)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 
 	/*
 	 * We need to do a deep copy of the iov_iter including the iovecs.
 	 * The caller provided iov might point to an on-stack or otherwise
 	 * shortlived one.
 	 */
-	bmd->is_our_pages = map_data ? 0 : 1;
+	bmd->is_our_pages = !map_data;
 
 	nr_pages = DIV_ROUND_UP(offset + len, PAGE_SIZE);
 	if (nr_pages > BIO_MAX_PAGES)
@@ -168,8 +157,7 @@ static struct bio *bio_copy_user_iov(struct request_queue *q,
 	bio = bio_kmalloc(gfp_mask, nr_pages);
 	if (!bio)
 		goto out_bmd;
-
-	ret = 0;
+	bio->bi_opf |= req_op(rq);
 
 	if (map_data) {
 		nr_pages = 1 << map_data->page_order;
@@ -186,7 +174,7 @@ static struct bio *bio_copy_user_iov(struct request_queue *q,
 		if (map_data) {
 			if (i == map_data->nr_entries * nr_pages) {
 				ret = -ENOMEM;
-				break;
+				goto cleanup;
 			}
 
 			page = map_data->pages[i / nr_pages];
@@ -194,14 +182,14 @@ static struct bio *bio_copy_user_iov(struct request_queue *q,
 
 			i++;
 		} else {
-			page = alloc_page(q->bounce_gfp | gfp_mask);
+			page = alloc_page(rq->q->bounce_gfp | gfp_mask);
 			if (!page) {
 				ret = -ENOMEM;
-				break;
+				goto cleanup;
 			}
 		}
 
-		if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes) {
+		if (bio_add_pc_page(rq->q, bio, page, bytes, offset) < bytes) {
 			if (!map_data)
 				__free_page(page);
 			break;
@@ -211,9 +199,6 @@ static struct bio *bio_copy_user_iov(struct request_queue *q,
 		offset = 0;
 	}
 
-	if (ret)
-		goto cleanup;
-
 	if (map_data)
 		map_data->offset += bio->bi_iter.bi_size;
 
@@ -234,40 +219,43 @@ static struct bio *bio_copy_user_iov(struct request_queue *q,
 
 	bio->bi_private = bmd;
 	if (map_data && map_data->null_mapped)
-		bio_set_flag(bio, BIO_NULL_MAPPED);
-	return bio;
+		bmd->is_null_mapped = true;
+
+	bounce_bio = bio;
+	ret = blk_rq_append_bio(rq, &bounce_bio);
+	if (ret)
+		goto cleanup;
+
+	/*
+	 * We link the bounce buffer in and could have to traverse it later, so
+	 * we have to get a ref to prevent it from being freed
+	 */
+	bio_get(bounce_bio);
+	return 0;
 cleanup:
 	if (!map_data)
 		bio_free_pages(bio);
 	bio_put(bio);
 out_bmd:
 	kfree(bmd);
-	return ERR_PTR(ret);
+	return ret;
 }
 
-/**
- *	bio_map_user_iov - map user iovec into bio
- *	@q:		the struct request_queue for the bio
- *	@iter:		iovec iterator
- *	@gfp_mask:	memory allocation flags
- *
- *	Map the user space address into a bio suitable for io to a block
- *	device. Returns an error pointer in case of error.
- */
-static struct bio *bio_map_user_iov(struct request_queue *q,
-		struct iov_iter *iter, gfp_t gfp_mask)
+static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
+		gfp_t gfp_mask)
 {
-	unsigned int max_sectors = queue_max_hw_sectors(q);
-	int j;
-	struct bio *bio;
+	unsigned int max_sectors = queue_max_hw_sectors(rq->q);
+	struct bio *bio, *bounce_bio;
 	int ret;
+	int j;
 
 	if (!iov_iter_count(iter))
-		return ERR_PTR(-EINVAL);
+		return -EINVAL;
 
 	bio = bio_kmalloc(gfp_mask, iov_iter_npages(iter, BIO_MAX_PAGES));
 	if (!bio)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
+	bio->bi_opf |= req_op(rq);
 
 	while (iov_iter_count(iter)) {
 		struct page **pages;
@@ -283,7 +271,7 @@ static struct bio *bio_map_user_iov(struct request_queue *q,
 
 		npages = DIV_ROUND_UP(offs + bytes, PAGE_SIZE);
 
-		if (unlikely(offs & queue_dma_alignment(q))) {
+		if (unlikely(offs & queue_dma_alignment(rq->q))) {
 			ret = -EINVAL;
 			j = 0;
 		} else {
@@ -295,7 +283,7 @@ static struct bio *bio_map_user_iov(struct request_queue *q,
 				if (n > bytes)
 					n = bytes;
 
-				if (!bio_add_hw_page(q, bio, page, n, offs,
+				if (!bio_add_hw_page(rq->q, bio, page, n, offs,
 						     max_sectors, &same_page)) {
 					if (same_page)
 						put_page(page);
@@ -319,21 +307,31 @@ static struct bio *bio_map_user_iov(struct request_queue *q,
 			break;
 	}
 
-	bio_set_flag(bio, BIO_USER_MAPPED);
-
 	/*
-	 * subtle -- if bio_map_user_iov() ended up bouncing a bio,
-	 * it would normally disappear when its bi_end_io is run.
-	 * however, we need it for the unmap, so grab an extra
-	 * reference to it
+	 * Subtle: if we end up needing to bounce a bio, it would normally
+	 * disappear when its bi_end_io is run.  However, we need the original
+	 * bio for the unmap, so grab an extra reference to it
 	 */
 	bio_get(bio);
-	return bio;
 
+	bounce_bio = bio;
+	ret = blk_rq_append_bio(rq, &bounce_bio);
+	if (ret)
+		goto out_put_orig;
+
+	/*
+	 * We link the bounce buffer in and could have to traverse it
+	 * later, so we have to get a ref to prevent it from being freed
+	 */
+	bio_get(bounce_bio);
+	return 0;
+
+ out_put_orig:
+	bio_put(bio);
  out_unmap:
 	bio_release_pages(bio, false);
 	bio_put(bio);
-	return ERR_PTR(ret);
+	return ret;
 }
 
 /**
@@ -557,55 +555,6 @@ int blk_rq_append_bio(struct request *rq, struct bio **bio)
 }
 EXPORT_SYMBOL(blk_rq_append_bio);
 
-static int __blk_rq_unmap_user(struct bio *bio)
-{
-	int ret = 0;
-
-	if (bio) {
-		if (bio_flagged(bio, BIO_USER_MAPPED))
-			bio_unmap_user(bio);
-		else
-			ret = bio_uncopy_user(bio);
-	}
-
-	return ret;
-}
-
-static int __blk_rq_map_user_iov(struct request *rq,
-		struct rq_map_data *map_data, struct iov_iter *iter,
-		gfp_t gfp_mask, bool copy)
-{
-	struct request_queue *q = rq->q;
-	struct bio *bio, *orig_bio;
-	int ret;
-
-	if (copy)
-		bio = bio_copy_user_iov(q, map_data, iter, gfp_mask);
-	else
-		bio = bio_map_user_iov(q, iter, gfp_mask);
-
-	if (IS_ERR(bio))
-		return PTR_ERR(bio);
-
-	bio->bi_opf &= ~REQ_OP_MASK;
-	bio->bi_opf |= req_op(rq);
-
-	orig_bio = bio;
-
-	/*
-	 * We link the bounce buffer in and could have to traverse it
-	 * later so we have to get a ref to prevent it from being freed
-	 */
-	ret = blk_rq_append_bio(rq, &bio);
-	if (ret) {
-		__blk_rq_unmap_user(orig_bio);
-		return ret;
-	}
-	bio_get(bio);
-
-	return 0;
-}
-
 /**
  * blk_rq_map_user_iov - map user data to a request, for passthrough requests
  * @q:		request queue where request should be inserted
@@ -649,7 +598,10 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
 
 	i = *iter;
 	do {
-		ret =__blk_rq_map_user_iov(rq, map_data, &i, gfp_mask, copy);
+		if (copy)
+			ret = bio_copy_user_iov(rq, map_data, &i, gfp_mask);
+		else
+			ret = bio_map_user_iov(rq, &i, gfp_mask);
 		if (ret)
 			goto unmap_rq;
 		if (!bio)
@@ -700,9 +652,13 @@ int blk_rq_unmap_user(struct bio *bio)
 		if (unlikely(bio_flagged(bio, BIO_BOUNCED)))
 			mapped_bio = bio->bi_private;
 
-		ret2 = __blk_rq_unmap_user(mapped_bio);
-		if (ret2 && !ret)
-			ret = ret2;
+		if (bio->bi_private) {
+			ret2 = bio_uncopy_user(mapped_bio);
+			if (ret2 && !ret)
+				ret = ret2;
+		} else {
+			bio_unmap_user(mapped_bio);
+		}
 
 		mapped_bio = bio;
 		bio = bio->bi_next;
diff --git a/block/blk-merge.c b/block/blk-merge.c
index f685d633bcc9..80c974484a3f 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -11,6 +11,7 @@
 #include <trace/events/block.h>
 
 #include "blk.h"
+#include "blk-rq-qos.h"
 
 static inline bool bio_will_gap(struct request_queue *q,
 		struct request *prev_rq, struct bio *prev, struct bio *next)
@@ -895,3 +896,205 @@ enum elv_merge blk_try_merge(struct request *rq, struct bio *bio)
 		return ELEVATOR_FRONT_MERGE;
 	return ELEVATOR_NO_MERGE;
 }
+
+static void blk_account_io_merge_bio(struct request *req)
+{
+	if (!blk_do_io_stat(req))
+		return;
+
+	part_stat_lock();
+	part_stat_inc(req->part, merges[op_stat_group(req_op(req))]);
+	part_stat_unlock();
+}
+
+enum bio_merge_status bio_attempt_back_merge(struct request *req,
+					     struct bio *bio,
+					     unsigned int nr_segs)
+{
+	const int ff = bio->bi_opf & REQ_FAILFAST_MASK;
+
+	if (!ll_back_merge_fn(req, bio, nr_segs))
+		return BIO_MERGE_FAILED;
+
+	trace_block_bio_backmerge(req->q, req, bio);
+	rq_qos_merge(req->q, req, bio);
+
+	if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
+		blk_rq_set_mixed_merge(req);
+
+	req->biotail->bi_next = bio;
+	req->biotail = bio;
+	req->__data_len += bio->bi_iter.bi_size;
+
+	bio_crypt_free_ctx(bio);
+
+	blk_account_io_merge_bio(req);
+	return BIO_MERGE_OK;
+}
+
+enum bio_merge_status bio_attempt_front_merge(struct request *req,
+					      struct bio *bio,
+					      unsigned int nr_segs)
+{
+	const int ff = bio->bi_opf & REQ_FAILFAST_MASK;
+
+	if (!ll_front_merge_fn(req, bio, nr_segs))
+		return BIO_MERGE_FAILED;
+
+	trace_block_bio_frontmerge(req->q, req, bio);
+	rq_qos_merge(req->q, req, bio);
+
+	if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
+		blk_rq_set_mixed_merge(req);
+
+	bio->bi_next = req->bio;
+	req->bio = bio;
+
+	req->__sector = bio->bi_iter.bi_sector;
+	req->__data_len += bio->bi_iter.bi_size;
+
+	bio_crypt_do_front_merge(req, bio);
+
+	blk_account_io_merge_bio(req);
+	return BIO_MERGE_OK;
+}
+
+enum bio_merge_status bio_attempt_discard_merge(struct request_queue *q,
+						struct request *req,
+						struct bio *bio)
+{
+	unsigned short segments = blk_rq_nr_discard_segments(req);
+
+	if (segments >= queue_max_discard_segments(q))
+		goto no_merge;
+	if (blk_rq_sectors(req) + bio_sectors(bio) >
+	    blk_rq_get_max_sectors(req, blk_rq_pos(req)))
+		goto no_merge;
+
+	rq_qos_merge(q, req, bio);
+
+	req->biotail->bi_next = bio;
+	req->biotail = bio;
+	req->__data_len += bio->bi_iter.bi_size;
+	req->nr_phys_segments = segments + 1;
+
+	blk_account_io_merge_bio(req);
+	return BIO_MERGE_OK;
+no_merge:
+	req_set_nomerge(q, req);
+	return BIO_MERGE_FAILED;
+}
+
+static enum bio_merge_status blk_attempt_bio_merge(struct request_queue *q,
+						   struct request *rq,
+						   struct bio *bio,
+						   unsigned int nr_segs,
+						   bool sched_allow_merge)
+{
+	if (!blk_rq_merge_ok(rq, bio))
+		return BIO_MERGE_NONE;
+
+	switch (blk_try_merge(rq, bio)) {
+	case ELEVATOR_BACK_MERGE:
+		if (!sched_allow_merge ||
+		    (sched_allow_merge && blk_mq_sched_allow_merge(q, rq, bio)))
+			return bio_attempt_back_merge(rq, bio, nr_segs);
+		break;
+	case ELEVATOR_FRONT_MERGE:
+		if (!sched_allow_merge ||
+		    (sched_allow_merge && blk_mq_sched_allow_merge(q, rq, bio)))
+			return bio_attempt_front_merge(rq, bio, nr_segs);
+		break;
+	case ELEVATOR_DISCARD_MERGE:
+		return bio_attempt_discard_merge(q, rq, bio);
+	default:
+		return BIO_MERGE_NONE;
+	}
+
+	return BIO_MERGE_FAILED;
+}
+
+/**
+ * blk_attempt_plug_merge - try to merge with %current's plugged list
+ * @q: request_queue new bio is being queued at
+ * @bio: new bio being queued
+ * @nr_segs: number of segments in @bio
+ * @same_queue_rq: pointer to &struct request that gets filled in when
+ * another request associated with @q is found on the plug list
+ * (optional, may be %NULL)
+ *
+ * Determine whether @bio being queued on @q can be merged with a request
+ * on %current's plugged list.  Returns %true if merge was successful,
+ * otherwise %false.
+ *
+ * Plugging coalesces IOs from the same issuer for the same purpose without
+ * going through @q->queue_lock.  As such it's more of an issuing mechanism
+ * than scheduling, and the request, while may have elvpriv data, is not
+ * added on the elevator at this point.  In addition, we don't have
+ * reliable access to the elevator outside queue lock.  Only check basic
+ * merging parameters without querying the elevator.
+ *
+ * Caller must ensure !blk_queue_nomerges(q) beforehand.
+ */
+bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
+		unsigned int nr_segs, struct request **same_queue_rq)
+{
+	struct blk_plug *plug;
+	struct request *rq;
+	struct list_head *plug_list;
+
+	plug = blk_mq_plug(q, bio);
+	if (!plug)
+		return false;
+
+	plug_list = &plug->mq_list;
+
+	list_for_each_entry_reverse(rq, plug_list, queuelist) {
+		if (rq->q == q && same_queue_rq) {
+			/*
+			 * Only blk-mq multiple hardware queues case checks the
+			 * rq in the same queue, there should be only one such
+			 * rq in a queue
+			 **/
+			*same_queue_rq = rq;
+		}
+
+		if (rq->q != q)
+			continue;
+
+		if (blk_attempt_bio_merge(q, rq, bio, nr_segs, false) ==
+		    BIO_MERGE_OK)
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * Iterate list of requests and see if we can merge this bio with any
+ * of them.
+ */
+bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
+			struct bio *bio, unsigned int nr_segs)
+{
+	struct request *rq;
+	int checked = 8;
+
+	list_for_each_entry_reverse(rq, list, queuelist) {
+		if (!checked--)
+			break;
+
+		switch (blk_attempt_bio_merge(q, rq, bio, nr_segs, true)) {
+		case BIO_MERGE_NONE:
+			continue;
+		case BIO_MERGE_OK:
+			return true;
+		case BIO_MERGE_FAILED:
+			return false;
+		}
+
+	}
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(blk_bio_list_merge);
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index d2790e5b06d1..501a85ceaccb 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -368,7 +368,7 @@ bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
 	case ELEVATOR_BACK_MERGE:
 		if (!blk_mq_sched_allow_merge(q, rq, bio))
 			return false;
-		if (!bio_attempt_back_merge(rq, bio, nr_segs))
+		if (bio_attempt_back_merge(rq, bio, nr_segs) != BIO_MERGE_OK)
 			return false;
 		*merged_request = attempt_back_merge(q, rq);
 		if (!*merged_request)
@@ -377,86 +377,20 @@ bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
 	case ELEVATOR_FRONT_MERGE:
 		if (!blk_mq_sched_allow_merge(q, rq, bio))
 			return false;
-		if (!bio_attempt_front_merge(rq, bio, nr_segs))
+		if (bio_attempt_front_merge(rq, bio, nr_segs) != BIO_MERGE_OK)
 			return false;
 		*merged_request = attempt_front_merge(q, rq);
 		if (!*merged_request)
 			elv_merged_request(q, rq, ELEVATOR_FRONT_MERGE);
 		return true;
 	case ELEVATOR_DISCARD_MERGE:
-		return bio_attempt_discard_merge(q, rq, bio);
+		return bio_attempt_discard_merge(q, rq, bio) == BIO_MERGE_OK;
 	default:
 		return false;
 	}
 }
 EXPORT_SYMBOL_GPL(blk_mq_sched_try_merge);
 
-/*
- * Iterate list of requests and see if we can merge this bio with any
- * of them.
- */
-bool blk_mq_bio_list_merge(struct request_queue *q, struct list_head *list,
-			   struct bio *bio, unsigned int nr_segs)
-{
-	struct request *rq;
-	int checked = 8;
-
-	list_for_each_entry_reverse(rq, list, queuelist) {
-		bool merged = false;
-
-		if (!checked--)
-			break;
-
-		if (!blk_rq_merge_ok(rq, bio))
-			continue;
-
-		switch (blk_try_merge(rq, bio)) {
-		case ELEVATOR_BACK_MERGE:
-			if (blk_mq_sched_allow_merge(q, rq, bio))
-				merged = bio_attempt_back_merge(rq, bio,
-						nr_segs);
-			break;
-		case ELEVATOR_FRONT_MERGE:
-			if (blk_mq_sched_allow_merge(q, rq, bio))
-				merged = bio_attempt_front_merge(rq, bio,
-						nr_segs);
-			break;
-		case ELEVATOR_DISCARD_MERGE:
-			merged = bio_attempt_discard_merge(q, rq, bio);
-			break;
-		default:
-			continue;
-		}
-
-		return merged;
-	}
-
-	return false;
-}
-EXPORT_SYMBOL_GPL(blk_mq_bio_list_merge);
-
-/*
- * Reverse check our software queue for entries that we could potentially
- * merge with. Currently includes a hand-wavy stop count of 8, to not spend
- * too much time checking for merges.
- */
-static bool blk_mq_attempt_merge(struct request_queue *q,
-				 struct blk_mq_hw_ctx *hctx,
-				 struct blk_mq_ctx *ctx, struct bio *bio,
-				 unsigned int nr_segs)
-{
-	enum hctx_type type = hctx->type;
-
-	lockdep_assert_held(&ctx->lock);
-
-	if (blk_mq_bio_list_merge(q, &ctx->rq_lists[type], bio, nr_segs)) {
-		ctx->rq_merged++;
-		return true;
-	}
-
-	return false;
-}
-
 bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
 		unsigned int nr_segs)
 {
@@ -470,14 +404,24 @@ bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
 		return e->type->ops.bio_merge(hctx, bio, nr_segs);
 
 	type = hctx->type;
-	if ((hctx->flags & BLK_MQ_F_SHOULD_MERGE) &&
-			!list_empty_careful(&ctx->rq_lists[type])) {
-		/* default per sw-queue merge */
-		spin_lock(&ctx->lock);
-		ret = blk_mq_attempt_merge(q, hctx, ctx, bio, nr_segs);
-		spin_unlock(&ctx->lock);
+	if (!(hctx->flags & BLK_MQ_F_SHOULD_MERGE) ||
+	    list_empty_careful(&ctx->rq_lists[type]))
+		return false;
+
+	/* default per sw-queue merge */
+	spin_lock(&ctx->lock);
+	/*
+	 * Reverse check our software queue for entries that we could
+	 * potentially merge with. Currently includes a hand-wavy stop
+	 * count of 8, to not spend too much time checking for merges.
+	 */
+	if (blk_bio_list_merge(q, &ctx->rq_lists[type], bio, nr_segs)) {
+		ctx->rq_merged++;
+		ret = true;
 	}
 
+	spin_unlock(&ctx->lock);
+
 	return ret;
 }
 
@@ -531,7 +475,7 @@ void blk_mq_sched_insert_request(struct request *rq, bool at_head,
 		goto run;
 	}
 
-	WARN_ON(e && (rq->tag != -1));
+	WARN_ON(e && (rq->tag != BLK_MQ_NO_TAG));
 
 	if (blk_mq_sched_bypass_insert(hctx, !!e, rq)) {
 		/*
diff --git a/block/blk.h b/block/blk.h
index 49e2928a1632..c08762e10b04 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -29,6 +29,12 @@ struct blk_flush_queue {
 	spinlock_t		mq_flush_lock;
 };
 
+enum bio_merge_status {
+	BIO_MERGE_OK,
+	BIO_MERGE_NONE,
+	BIO_MERGE_FAILED,
+};
+
 extern struct kmem_cache *blk_requestq_cachep;
 extern struct kobj_type blk_queue_ktype;
 extern struct ida blk_queue_ida;
@@ -169,14 +175,19 @@ static inline void blk_integrity_del(struct gendisk *disk)
 unsigned long blk_rq_timeout(unsigned long timeout);
 void blk_add_timer(struct request *req);
 
-bool bio_attempt_front_merge(struct request *req, struct bio *bio,
-		unsigned int nr_segs);
-bool bio_attempt_back_merge(struct request *req, struct bio *bio,
-		unsigned int nr_segs);
-bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
-		struct bio *bio);
+enum bio_merge_status bio_attempt_front_merge(struct request *req,
+					      struct bio *bio,
+					      unsigned int nr_segs);
+enum bio_merge_status bio_attempt_back_merge(struct request *req,
+					     struct bio *bio,
+					     unsigned int nr_segs);
+enum bio_merge_status bio_attempt_discard_merge(struct request_queue *q,
+						struct request *req,
+						struct bio *bio);
 bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
 		unsigned int nr_segs, struct request **same_queue_rq);
+bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
+			struct bio *bio, unsigned int nr_segs);
 
 void blk_account_io_start(struct request *req);
 void blk_account_io_done(struct request *req, u64 now);
@@ -350,7 +361,7 @@ char *disk_name(struct gendisk *hd, int partno, char *buf);
 #define ADDPART_FLAG_NONE	0
 #define ADDPART_FLAG_RAID	1
 #define ADDPART_FLAG_WHOLEDISK	2
-void delete_partition(struct gendisk *disk, struct hd_struct *part);
+void delete_partition(struct hd_struct *part);
 int bdev_add_partition(struct block_device *bdev, int partno,
 		sector_t start, sector_t length);
 int bdev_del_partition(struct block_device *bdev, int partno);
diff --git a/block/genhd.c b/block/genhd.c
index 99c64641c314..5fc6d82e6c68 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -110,8 +110,7 @@ static void part_stat_read_all(struct hd_struct *part, struct disk_stats *stat)
 	}
 }
 
-static unsigned int part_in_flight(struct request_queue *q,
-		struct hd_struct *part)
+static unsigned int part_in_flight(struct hd_struct *part)
 {
 	unsigned int inflight = 0;
 	int cpu;
@@ -126,8 +125,7 @@ static unsigned int part_in_flight(struct request_queue *q,
 	return inflight;
 }
 
-static void part_in_flight_rw(struct request_queue *q, struct hd_struct *part,
-		unsigned int inflight[2])
+static void part_in_flight_rw(struct hd_struct *part, unsigned int inflight[2])
 {
 	int cpu;
 
@@ -913,7 +911,7 @@ void del_gendisk(struct gendisk *disk)
 			     DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
 	while ((part = disk_part_iter_next(&piter))) {
 		invalidate_partition(disk, part->partno);
-		delete_partition(disk, part);
+		delete_partition(part);
 	}
 	disk_part_iter_exit(&piter);
 
@@ -1301,7 +1299,7 @@ ssize_t part_stat_show(struct device *dev,
 	if (queue_is_mq(q))
 		inflight = blk_mq_in_flight(q, p);
 	else
-		inflight = part_in_flight(q, p);
+		inflight = part_in_flight(p);
 
 	return sprintf(buf,
 		"%8lu %8lu %8llu %8u "
@@ -1343,7 +1341,7 @@ ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
 	if (queue_is_mq(q))
 		blk_mq_in_flight_rw(q, p, inflight);
 	else
-		part_in_flight_rw(q, p, inflight);
+		part_in_flight_rw(p, inflight);
 
 	return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]);
 }
@@ -1623,7 +1621,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
 		if (queue_is_mq(gp->queue))
 			inflight = blk_mq_in_flight(gp->queue, hd);
 		else
-			inflight = part_in_flight(gp->queue, hd);
+			inflight = part_in_flight(hd);
 
 		seq_printf(seqf, "%4d %7d %s "
 			   "%lu %lu %lu %u "
@@ -1729,45 +1727,48 @@ struct gendisk *__alloc_disk_node(int minors, int node_id)
 	}
 
 	disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id);
-	if (disk) {
-		disk->part0.dkstats = alloc_percpu(struct disk_stats);
-		if (!disk->part0.dkstats) {
-			kfree(disk);
-			return NULL;
-		}
-		init_rwsem(&disk->lookup_sem);
-		disk->node_id = node_id;
-		if (disk_expand_part_tbl(disk, 0)) {
-			free_percpu(disk->part0.dkstats);
-			kfree(disk);
-			return NULL;
-		}
-		ptbl = rcu_dereference_protected(disk->part_tbl, 1);
-		rcu_assign_pointer(ptbl->part[0], &disk->part0);
+	if (!disk)
+		return NULL;
 
-		/*
-		 * set_capacity() and get_capacity() currently don't use
-		 * seqcounter to read/update the part0->nr_sects. Still init
-		 * the counter as we can read the sectors in IO submission
-		 * patch using seqence counters.
-		 *
-		 * TODO: Ideally set_capacity() and get_capacity() should be
-		 * converted to make use of bd_mutex and sequence counters.
-		 */
-		hd_sects_seq_init(&disk->part0);
-		if (hd_ref_init(&disk->part0)) {
-			hd_free_part(&disk->part0);
-			kfree(disk);
-			return NULL;
-		}
+	disk->part0.dkstats = alloc_percpu(struct disk_stats);
+	if (!disk->part0.dkstats)
+		goto out_free_disk;
 
-		disk->minors = minors;
-		rand_initialize_disk(disk);
-		disk_to_dev(disk)->class = &block_class;
-		disk_to_dev(disk)->type = &disk_type;
-		device_initialize(disk_to_dev(disk));
+	init_rwsem(&disk->lookup_sem);
+	disk->node_id = node_id;
+	if (disk_expand_part_tbl(disk, 0)) {
+		free_percpu(disk->part0.dkstats);
+		goto out_free_disk;
 	}
+
+	ptbl = rcu_dereference_protected(disk->part_tbl, 1);
+	rcu_assign_pointer(ptbl->part[0], &disk->part0);
+
+	/*
+	 * set_capacity() and get_capacity() currently don't use
+	 * seqcounter to read/update the part0->nr_sects. Still init
+	 * the counter as we can read the sectors in IO submission
+	 * patch using seqence counters.
+	 *
+	 * TODO: Ideally set_capacity() and get_capacity() should be
+	 * converted to make use of bd_mutex and sequence counters.
+	 */
+	hd_sects_seq_init(&disk->part0);
+	if (hd_ref_init(&disk->part0))
+		goto out_free_part0;
+
+	disk->minors = minors;
+	rand_initialize_disk(disk);
+	disk_to_dev(disk)->class = &block_class;
+	disk_to_dev(disk)->type = &disk_type;
+	device_initialize(disk_to_dev(disk));
 	return disk;
+
+out_free_part0:
+	hd_free_part(&disk->part0);
+out_free_disk:
+	kfree(disk);
+	return NULL;
 }
 EXPORT_SYMBOL(__alloc_disk_node);
 
diff --git a/block/kyber-iosched.c b/block/kyber-iosched.c
index a38c5ab103d1..6d4ba0e9688e 100644
--- a/block/kyber-iosched.c
+++ b/block/kyber-iosched.c
@@ -573,7 +573,7 @@ static bool kyber_bio_merge(struct blk_mq_hw_ctx *hctx, struct bio *bio,
 	bool merged;
 
 	spin_lock(&kcq->lock);
-	merged = blk_mq_bio_list_merge(hctx->queue, rq_list, bio, nr_segs);
+	merged = blk_bio_list_merge(hctx->queue, rq_list, bio, nr_segs);
 	spin_unlock(&kcq->lock);
 
 	return merged;
diff --git a/block/partitions/core.c b/block/partitions/core.c
index 722406b841df..5cacbac30107 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -199,14 +199,20 @@ static ssize_t part_alignment_offset_show(struct device *dev,
 					  struct device_attribute *attr, char *buf)
 {
 	struct hd_struct *p = dev_to_part(dev);
-	return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
+
+	return sprintf(buf, "%u\n",
+		queue_limit_alignment_offset(&part_to_disk(p)->queue->limits,
+				p->start_sect));
 }
 
 static ssize_t part_discard_alignment_show(struct device *dev,
 					   struct device_attribute *attr, char *buf)
 {
 	struct hd_struct *p = dev_to_part(dev);
-	return sprintf(buf, "%u\n", p->discard_alignment);
+
+	return sprintf(buf, "%u\n",
+		queue_limit_discard_alignment(&part_to_disk(p)->queue->limits,
+				p->start_sect));
 }
 
 static DEVICE_ATTR(partition, 0444, part_partition_show, NULL);
@@ -318,8 +324,9 @@ int hd_ref_init(struct hd_struct *part)
  * Must be called either with bd_mutex held, before a disk can be opened or
  * after all disk users are gone.
  */
-void delete_partition(struct gendisk *disk, struct hd_struct *part)
+void delete_partition(struct hd_struct *part)
 {
+	struct gendisk *disk = part_to_disk(part);
 	struct disk_part_tbl *ptbl =
 		rcu_dereference_protected(disk->part_tbl, 1);
 
@@ -327,7 +334,7 @@ void delete_partition(struct gendisk *disk, struct hd_struct *part)
 	 * ->part_tbl is referenced in this part's release handler, so
 	 *  we have to hold the disk device
 	 */
-	get_device(disk_to_dev(part_to_disk(part)));
+	get_device(disk_to_dev(disk));
 	rcu_assign_pointer(ptbl->part[part->partno], NULL);
 	kobject_put(part->holder_dir);
 	device_del(part_to_dev(part));
@@ -405,10 +412,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
 	pdev = part_to_dev(p);
 
 	p->start_sect = start;
-	p->alignment_offset =
-		queue_limit_alignment_offset(&disk->queue->limits, start);
-	p->discard_alignment =
-		queue_limit_discard_alignment(&disk->queue->limits, start);
 	p->nr_sects = len;
 	p->partno = partno;
 	p->policy = get_disk_ro(disk);
@@ -554,7 +557,7 @@ int bdev_del_partition(struct block_device *bdev, int partno)
 	sync_blockdev(bdevp);
 	invalidate_bdev(bdevp);
 
-	delete_partition(bdev->bd_disk, part);
+	delete_partition(part);
 	ret = 0;
 out_unlock:
 	mutex_unlock(&bdev->bd_mutex);
@@ -592,8 +595,8 @@ int bdev_resize_partition(struct block_device *bdev, int partno,
 	if (partition_overlaps(bdev->bd_disk, start, length, partno))
 		goto out_unlock;
 
-	part_nr_sects_write(part, (sector_t)length);
-	i_size_write(bdevp->bd_inode, length << SECTOR_SHIFT);
+	part_nr_sects_write(part, length);
+	bd_set_nr_sectors(bdevp, length);
 
 	ret = 0;
 out_unlock:
@@ -634,7 +637,7 @@ int blk_drop_partitions(struct block_device *bdev)
 
 	disk_part_iter_init(&piter, bdev->bd_disk, DISK_PITER_INCL_EMPTY);
 	while ((part = disk_part_iter_next(&piter)))
-		delete_partition(bdev->bd_disk, part);
+		delete_partition(part);
 	disk_part_iter_exit(&piter);
 
 	return 0;
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 6dba41395155..313f0b946fe2 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -900,9 +900,7 @@ aoecmd_sleepwork(struct work_struct *work)
 		ssize = get_capacity(d->gd);
 		bd = bdget_disk(d->gd, 0);
 		if (bd) {
-			inode_lock(bd->bd_inode);
-			i_size_write(bd->bd_inode, (loff_t)ssize<<9);
-			inode_unlock(bd->bd_inode);
+			bd_set_nr_sectors(bd, ssize);
 			bdput(bd);
 		}
 		spin_lock_irq(&d->lock);
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index d3394191e168..cb1191d6e945 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -253,7 +253,7 @@ static void loop_set_size(struct loop_device *lo, loff_t size)
 {
 	struct block_device *bdev = lo->lo_device;
 
-	bd_set_size(bdev, size << SECTOR_SHIFT);
+	bd_set_nr_sectors(bdev, size);
 
 	set_capacity_revalidate_and_notify(lo->lo_disk, size, false);
 }
@@ -1251,7 +1251,7 @@ static int __loop_clr_fd(struct loop_device *lo, bool release)
 	set_capacity(lo->lo_disk, 0);
 	loop_sysfs_exit(lo);
 	if (bdev) {
-		bd_set_size(bdev, 0);
+		bd_set_nr_sectors(bdev, 0);
 		/* let user-space know about this change */
 		kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
 	}
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index edf8b632e3d2..a54f2d155a31 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -300,6 +300,7 @@ static void nbd_size_update(struct nbd_device *nbd)
 {
 	struct nbd_config *config = nbd->config;
 	struct block_device *bdev = bdget_disk(nbd->disk, 0);
+	sector_t nr_sectors = config->bytesize >> 9;
 
 	if (config->flags & NBD_FLAG_SEND_TRIM) {
 		nbd->disk->queue->limits.discard_granularity = config->blksize;
@@ -308,10 +309,10 @@ static void nbd_size_update(struct nbd_device *nbd)
 	}
 	blk_queue_logical_block_size(nbd->disk->queue, config->blksize);
 	blk_queue_physical_block_size(nbd->disk->queue, config->blksize);
-	set_capacity(nbd->disk, config->bytesize >> 9);
+	set_capacity(nbd->disk, nr_sectors);
 	if (bdev) {
 		if (bdev->bd_disk) {
-			bd_set_size(bdev, config->bytesize);
+			bd_set_nr_sectors(bdev, nr_sectors);
 			set_blocksize(bdev, config->blksize);
 		} else
 			bdev->bd_invalidated = 1;
@@ -1138,7 +1139,7 @@ static void nbd_bdev_reset(struct block_device *bdev)
 {
 	if (bdev->bd_openers > 1)
 		return;
-	bd_set_size(bdev, 0);
+	bd_set_nr_sectors(bdev, 0);
 }
 
 static void nbd_parse_flags(struct nbd_device *nbd)
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 1034e445680c..17f2e6ff1223 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2192,7 +2192,7 @@ static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
 
 	set_capacity(pd->disk, lba << 2);
 	set_capacity(pd->bdev->bd_disk, lba << 2);
-	bd_set_size(pd->bdev, (loff_t)lba << 11);
+	bd_set_nr_sectors(pd->bdev, lba << 2);
 
 	q = bdev_get_queue(pd->bdev);
 	if (write) {
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index f20f02b7bc15..bf3d752e443f 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -648,7 +648,7 @@ static struct attribute *virtblk_attrs[] = {
 static umode_t virtblk_attrs_are_visible(struct kobject *kobj,
 		struct attribute *a, int n)
 {
-	struct device *dev = container_of(kobj, struct device, kobj);
+	struct device *dev = kobj_to_dev(kobj);
 	struct gendisk *disk = dev_to_disk(dev);
 	struct virtio_blk *vblk = disk->private_data;
 	struct virtio_device *vdev = vblk->vdev;
diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index 380bf518338e..ccf5bd528642 100644
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -63,6 +63,11 @@ static int raw_open(struct inode *inode, struct file *filp)
 		return 0;
 	}
 
+	pr_warn_ratelimited(
+		"process %s (pid %d) is using the deprecated raw device\n"
+		"support will be removed in Linux 5.14.\n",
+		current->comm, current->pid);
+
 	mutex_lock(&raw_mutex);
 
 	/*
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 9d2f9dd70a4c..efd6c4255356 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2086,18 +2086,6 @@ static void event_callback(void *context)
 	dm_issue_global_event();
 }
 
-/*
- * Protected by md->suspend_lock obtained by dm_swap_table().
- */
-static void __set_size(struct mapped_device *md, sector_t size)
-{
-	lockdep_assert_held(&md->suspend_lock);
-
-	set_capacity(md->disk, size);
-
-	i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
-}
-
 /*
  * Returns old map, which caller must destroy.
  */
@@ -2120,7 +2108,8 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
 	if (size != dm_get_size(md))
 		memset(&md->geometry, 0, sizeof(md->geometry));
 
-	__set_size(md, size);
+	set_capacity(md->disk, size);
+	bd_set_nr_sectors(md->bdev, size);
 
 	dm_table_event_callback(t, event_callback, md);
 
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 893e29624c16..4a053aca3eea 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -94,21 +94,34 @@ static void nvme_put_subsystem(struct nvme_subsystem *subsys);
 static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
 					   unsigned nsid);
 
+static void nvme_update_bdev_size(struct gendisk *disk)
+{
+	struct block_device *bdev = bdget_disk(disk, 0);
+
+	if (bdev) {
+		bd_set_nr_sectors(bdev, get_capacity(disk));
+		bdput(bdev);
+	}
+}
+
+/*
+ * Prepare a queue for teardown.
+ *
+ * This must forcibly unquiesce queues to avoid blocking dispatch, and only set
+ * the capacity to 0 after that to avoid blocking dispatchers that may be
+ * holding bd_butex.  This will end buffered writers dirtying pages that can't
+ * be synced.
+ */
 static void nvme_set_queue_dying(struct nvme_ns *ns)
 {
-	/*
-	 * Revalidating a dead namespace sets capacity to 0. This will end
-	 * buffered writers dirtying pages that can't be synced.
-	 */
 	if (test_and_set_bit(NVME_NS_DEAD, &ns->flags))
 		return;
+
 	blk_set_queue_dying(ns->queue);
-	/* Forcibly unquiesce queues to avoid blocking dispatch */
 	blk_mq_unquiesce_queue(ns->queue);
-	/*
-	 * Revalidate after unblocking dispatchers that may be holding bd_butex
-	 */
-	revalidate_disk(ns->disk);
+
+	set_capacity(ns->disk, 0);
+	nvme_update_bdev_size(ns->disk);
 }
 
 static void nvme_queue_scan(struct nvme_ctrl *ctrl)
@@ -2134,7 +2147,7 @@ static int __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
 		nvme_update_disk_info(ns->head->disk, ns, id);
 		blk_stack_limits(&ns->head->disk->queue->limits,
 				 &ns->queue->limits, 0);
-		nvme_mpath_update_disk_size(ns->head->disk);
+		nvme_update_bdev_size(ns->head->disk);
 	}
 #endif
 	return 0;
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 2aaedfa43ed8..8ac37430347c 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -682,16 +682,6 @@ static inline void nvme_trace_bio_complete(struct request *req,
 		trace_block_bio_complete(ns->head->disk->queue, req->bio);
 }
 
-static inline void nvme_mpath_update_disk_size(struct gendisk *disk)
-{
-	struct block_device *bdev = bdget_disk(disk, 0);
-
-	if (bdev) {
-		bd_set_size(bdev, get_capacity(disk) << SECTOR_SHIFT);
-		bdput(bdev);
-	}
-}
-
 extern struct device_attribute dev_attr_ana_grpid;
 extern struct device_attribute dev_attr_ana_state;
 extern struct device_attribute subsys_attr_iopolicy;
@@ -766,9 +756,6 @@ static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
 {
 }
-static inline void nvme_mpath_update_disk_size(struct gendisk *disk)
-{
-}
 #endif /* CONFIG_NVME_MULTIPATH */
 
 #ifdef CONFIG_BLK_DEV_ZONED
diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 777734d1b4e5..faaf5596e31c 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -55,10 +55,7 @@ dasd_ioctl_enable(struct block_device *bdev)
 
 	dasd_enable_device(base);
 	/* Formatting the dasd device can change the capacity. */
-	mutex_lock(&bdev->bd_mutex);
-	i_size_write(bdev->bd_inode,
-		     (loff_t)get_capacity(base->block->gdp) << 9);
-	mutex_unlock(&bdev->bd_mutex);
+	bd_set_nr_sectors(bdev, get_capacity(base->block->gdp));
 	dasd_put_device(base);
 	return 0;
 }
@@ -91,9 +88,7 @@ dasd_ioctl_disable(struct block_device *bdev)
 	 * Set i_size to zero, since read, write, etc. check against this
 	 * value.
 	 */
-	mutex_lock(&bdev->bd_mutex);
-	i_size_write(bdev->bd_inode, 0);
-	mutex_unlock(&bdev->bd_mutex);
+	bd_set_nr_sectors(bdev, 0);
 	dasd_put_device(base);
 	return 0;
 }
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 8ae833e00443..990e97bcbeaf 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -876,6 +876,7 @@ struct block_device *bdget(dev_t dev)
 	bdev = &BDEV_I(inode)->bdev;
 
 	if (inode->i_state & I_NEW) {
+		spin_lock_init(&bdev->bd_size_lock);
 		bdev->bd_contains = NULL;
 		bdev->bd_super = NULL;
 		bdev->bd_inode = inode;
@@ -1290,6 +1291,7 @@ static void check_disk_size_change(struct gendisk *disk,
 {
 	loff_t disk_size, bdev_size;
 
+	spin_lock(&bdev->bd_size_lock);
 	disk_size = (loff_t)get_capacity(disk) << 9;
 	bdev_size = i_size_read(bdev->bd_inode);
 	if (disk_size != bdev_size) {
@@ -1299,11 +1301,15 @@ static void check_disk_size_change(struct gendisk *disk,
 			       disk->disk_name, bdev_size, disk_size);
 		}
 		i_size_write(bdev->bd_inode, disk_size);
-		if (bdev_size > disk_size && __invalidate_device(bdev, false))
+	}
+	bdev->bd_invalidated = 0;
+	spin_unlock(&bdev->bd_size_lock);
+
+	if (bdev_size > disk_size) {
+		if (__invalidate_device(bdev, false))
 			pr_warn("VFS: busy inodes on resized disk %s\n",
 				disk->disk_name);
 	}
-	bdev->bd_invalidated = 0;
 }
 
 /**
@@ -1328,13 +1334,10 @@ int revalidate_disk(struct gendisk *disk)
 	if (!(disk->flags & GENHD_FL_HIDDEN)) {
 		struct block_device *bdev = bdget_disk(disk, 0);
 
-		if (!bdev)
-			return ret;
-
-		mutex_lock(&bdev->bd_mutex);
-		check_disk_size_change(disk, bdev, ret == 0);
-		mutex_unlock(&bdev->bd_mutex);
-		bdput(bdev);
+		if (bdev) {
+			check_disk_size_change(disk, bdev, ret == 0);
+			bdput(bdev);
+		}
 	}
 	return ret;
 }
@@ -1371,13 +1374,13 @@ int check_disk_change(struct block_device *bdev)
 
 EXPORT_SYMBOL(check_disk_change);
 
-void bd_set_size(struct block_device *bdev, loff_t size)
+void bd_set_nr_sectors(struct block_device *bdev, sector_t sectors)
 {
-	inode_lock(bdev->bd_inode);
-	i_size_write(bdev->bd_inode, size);
-	inode_unlock(bdev->bd_inode);
+	spin_lock(&bdev->bd_size_lock);
+	i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT);
+	spin_unlock(&bdev->bd_size_lock);
 }
-EXPORT_SYMBOL(bd_set_size);
+EXPORT_SYMBOL(bd_set_nr_sectors);
 
 static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
 
@@ -1446,22 +1449,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder,
 	struct gendisk *disk;
 	int ret;
 	int partno;
-	int perm = 0;
 	bool first_open = false, unblock_events = true, need_restart;
 
-	if (mode & FMODE_READ)
-		perm |= MAY_READ;
-	if (mode & FMODE_WRITE)
-		perm |= MAY_WRITE;
-	/*
-	 * hooks: /n/, see "layering violations".
-	 */
-	if (!for_part) {
-		ret = devcgroup_inode_permission(bdev->bd_inode, perm);
-		if (ret != 0)
-			return ret;
-	}
-
  restart:
 	need_restart = false;
 	ret = -ENXIO;
@@ -1514,7 +1503,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder,
 			}
 
 			if (!ret) {
-				bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
+				bd_set_nr_sectors(bdev, get_capacity(disk));
 				set_init_blocksize(bdev);
 			}
 
@@ -1542,7 +1531,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder,
 				ret = -ENXIO;
 				goto out_clear;
 			}
-			bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9);
+			bd_set_nr_sectors(bdev, bdev->bd_part->nr_sects);
 			set_init_blocksize(bdev);
 		}
 
@@ -1634,12 +1623,24 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder,
  */
 int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
 {
-	int res;
+	int ret, perm = 0;
 
-	res =__blkdev_get(bdev, mode, holder, 0);
-	if (res)
-		bdput(bdev);
-	return res;
+	if (mode & FMODE_READ)
+		perm |= MAY_READ;
+	if (mode & FMODE_WRITE)
+		perm |= MAY_WRITE;
+	ret = devcgroup_inode_permission(bdev->bd_inode, perm);
+	if (ret)
+		goto bdput;
+
+	ret =__blkdev_get(bdev, mode, holder, 0);
+	if (ret)
+		goto bdput;
+	return 0;
+
+bdput:
+	bdput(bdev);
+	return ret;
 }
 EXPORT_SYMBOL(blkdev_get);
 
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 9d2d5ad367a4..21a02e0577dd 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -489,8 +489,6 @@ void blk_mq_kick_requeue_list(struct request_queue *q);
 void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
 void blk_mq_complete_request(struct request *rq);
 bool blk_mq_complete_request_remote(struct request *rq);
-bool blk_mq_bio_list_merge(struct request_queue *q, struct list_head *list,
-			   struct bio *bio, unsigned int nr_segs);
 bool blk_mq_queue_stopped(struct request_queue *q);
 void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
 void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 46dca1b984c6..8d67ae1080fe 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -20,7 +20,7 @@ typedef void (bio_end_io_t) (struct bio *);
 struct bio_crypt_ctx;
 
 struct block_device {
-	dev_t			bd_dev;  /* not a kdev_t - it's a search key */
+	dev_t			bd_dev;
 	int			bd_openers;
 	struct inode *		bd_inode;	/* will die */
 	struct super_block *	bd_super;
@@ -38,6 +38,7 @@ struct block_device {
 	/* number of times partitions within this device have been opened. */
 	unsigned		bd_part_count;
 	int			bd_invalidated;
+	spinlock_t		bd_size_lock; /* for bd_inode->i_size updates */
 	struct gendisk *	bd_disk;
 	struct backing_dev_info *bd_bdi;
 
@@ -258,8 +259,6 @@ enum {
 	BIO_NO_PAGE_REF,	/* don't put release vec pages */
 	BIO_CLONED,		/* doesn't own data */
 	BIO_BOUNCED,		/* bio is a bounce bio */
-	BIO_USER_MAPPED,	/* contains user pages */
-	BIO_NULL_MAPPED,	/* contains invalid user pages */
 	BIO_WORKINGSET,		/* contains userspace workingset pages */
 	BIO_QUIET,		/* Make BIO Quiet */
 	BIO_CHAIN,		/* chained bio, ->bi_remaining in effect */
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 868e11face00..0769112ca80b 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -24,6 +24,7 @@
 #include <linux/percpu-refcount.h>
 #include <linux/scatterlist.h>
 #include <linux/blkzoned.h>
+#include <linux/pm.h>
 
 struct module;
 struct scsi_ioctl_command;
@@ -460,7 +461,7 @@ struct request_queue {
 
 #ifdef CONFIG_PM
 	struct device		*dev;
-	int			rpm_status;
+	enum rpm_status		rpm_status;
 	unsigned int		nr_pending;
 #endif
 
@@ -1457,10 +1458,9 @@ static inline int bdev_alignment_offset(struct block_device *bdev)
 
 	if (q->limits.misaligned)
 		return -1;
-
 	if (bdev != bdev->bd_contains)
-		return bdev->bd_part->alignment_offset;
-
+		return queue_limit_alignment_offset(&q->limits,
+				bdev->bd_part->start_sect);
 	return q->limits.alignment_offset;
 }
 
@@ -1500,8 +1500,8 @@ static inline int bdev_discard_alignment(struct block_device *bdev)
 	struct request_queue *q = bdev_get_queue(bdev);
 
 	if (bdev != bdev->bd_contains)
-		return bdev->bd_part->discard_alignment;
-
+		return queue_limit_discard_alignment(&q->limits,
+				bdev->bd_part->start_sect);
 	return q->limits.discard_alignment;
 }
 
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 4ab853461dff..9ea2ca31c278 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -65,8 +65,6 @@ struct hd_struct {
 	struct disk_stats __percpu *dkstats;
 	struct percpu_ref ref;
 
-	sector_t alignment_offset;
-	unsigned int discard_alignment;
 	struct device __dev;
 	struct kobject *holder_dir;
 	int policy, partno;
@@ -375,7 +373,7 @@ void unregister_blkdev(unsigned int major, const char *name);
 int revalidate_disk(struct gendisk *disk);
 int check_disk_change(struct block_device *bdev);
 int __invalidate_device(struct block_device *bdev, bool kill_dirty);
-void bd_set_size(struct block_device *bdev, loff_t size);
+void bd_set_nr_sectors(struct block_device *bdev, sector_t sectors);
 
 /* for drivers/char/raw.c: */
 int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);