diff --git a/block/bdev.c b/block/bdev.c
index cf2780c..485a258 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -490,7 +490,6 @@
 	bdev = I_BDEV(inode);
 	mutex_init(&bdev->bd_fsfreeze_mutex);
 	spin_lock_init(&bdev->bd_size_lock);
-	bdev->bd_disk = disk;
 	bdev->bd_partno = partno;
 	bdev->bd_inode = inode;
 	bdev->bd_stats = alloc_percpu(struct disk_stats);
@@ -498,6 +497,7 @@
 		iput(inode);
 		return NULL;
 	}
+	bdev->bd_disk = disk;
 	return bdev;
 }
 
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index dd13c2b..480e1a1 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -2662,15 +2662,6 @@
 	 * are likely to increase the throughput.
 	 */
 	bfqq->new_bfqq = new_bfqq;
-	/*
-	 * The above assignment schedules the following redirections:
-	 * each time some I/O for bfqq arrives, the process that
-	 * generated that I/O is disassociated from bfqq and
-	 * associated with new_bfqq. Here we increases new_bfqq->ref
-	 * in advance, adding the number of processes that are
-	 * expected to be associated with new_bfqq as they happen to
-	 * issue I/O.
-	 */
 	new_bfqq->ref += process_refs;
 	return new_bfqq;
 }
@@ -2733,10 +2724,6 @@
 {
 	struct bfq_queue *in_service_bfqq, *new_bfqq;
 
-	/* if a merge has already been setup, then proceed with that first */
-	if (bfqq->new_bfqq)
-		return bfqq->new_bfqq;
-
 	/*
 	 * Check delayed stable merge for rotational or non-queueing
 	 * devs. For this branch to be executed, bfqq must not be
@@ -2838,6 +2825,9 @@
 	if (bfq_too_late_for_merging(bfqq))
 		return NULL;
 
+	if (bfqq->new_bfqq)
+		return bfqq->new_bfqq;
+
 	if (!io_struct || unlikely(bfqq == &bfqd->oom_bfqq))
 		return NULL;
 
diff --git a/block/bio.c b/block/bio.c
index 5df3dd2..a6fb6a0 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1466,7 +1466,7 @@
 	if (!bio_integrity_endio(bio))
 		return;
 
-	if (bio->bi_bdev)
+	if (bio->bi_bdev && bio_flagged(bio, BIO_TRACKED))
 		rq_qos_done_bio(bio->bi_bdev->bd_disk->queue, bio);
 
 	if (bio->bi_bdev && bio_flagged(bio, BIO_TRACE_COMPLETION)) {
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 4b66d27..3b38d15 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -129,6 +129,7 @@
 	QUEUE_FLAG_NAME(PCI_P2PDMA),
 	QUEUE_FLAG_NAME(ZONE_RESETALL),
 	QUEUE_FLAG_NAME(RQ_ALLOC_TIME),
+	QUEUE_FLAG_NAME(HCTX_ACTIVE),
 	QUEUE_FLAG_NAME(NOWAIT),
 };
 #undef QUEUE_FLAG_NAME
diff --git a/block/fops.c b/block/fops.c
index ffce6f6..1e970c2 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -14,6 +14,7 @@
 #include <linux/task_io_accounting_ops.h>
 #include <linux/falloc.h>
 #include <linux/suspend.h>
+#include <linux/fs.h>
 #include "blk.h"
 
 static struct inode *bdev_file_inode(struct file *file)
@@ -553,7 +554,8 @@
 static long blkdev_fallocate(struct file *file, int mode, loff_t start,
 			     loff_t len)
 {
-	struct block_device *bdev = I_BDEV(bdev_file_inode(file));
+	struct inode *inode = bdev_file_inode(file);
+	struct block_device *bdev = I_BDEV(inode);
 	loff_t end = start + len - 1;
 	loff_t isize;
 	int error;
@@ -580,10 +582,12 @@
 	if ((start | len) & (bdev_logical_block_size(bdev) - 1))
 		return -EINVAL;
 
+	filemap_invalidate_lock(inode->i_mapping);
+
 	/* Invalidate the page cache, including dirty pages. */
 	error = truncate_bdev_range(bdev, file->f_mode, start, end);
 	if (error)
-		return error;
+		goto fail;
 
 	switch (mode) {
 	case FALLOC_FL_ZERO_RANGE:
@@ -600,17 +604,12 @@
 					     GFP_KERNEL, 0);
 		break;
 	default:
-		return -EOPNOTSUPP;
+		error = -EOPNOTSUPP;
 	}
-	if (error)
-		return error;
 
-	/*
-	 * Invalidate the page cache again; if someone wandered in and dirtied
-	 * a page, we just discard it - userspace has no way of knowing whether
-	 * the write happened before or after discard completing...
-	 */
-	return truncate_bdev_range(bdev, file->f_mode, start, end);
+ fail:
+	filemap_invalidate_unlock(inode->i_mapping);
+	return error;
 }
 
 const struct file_operations def_blk_fops = {
diff --git a/block/genhd.c b/block/genhd.c
index 7b6e5e1..496e845 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1268,6 +1268,7 @@
 
 out_destroy_part_tbl:
 	xa_destroy(&disk->part_tbl);
+	disk->part0->bd_disk = NULL;
 	iput(disk->part0->bd_inode);
 out_free_bdi:
 	bdi_put(disk->bdi);
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 5170a63..1183f78 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -97,13 +97,18 @@
 
 	atomic_t recv_threads;
 	wait_queue_head_t recv_wq;
-	loff_t blksize;
+	unsigned int blksize_bits;
 	loff_t bytesize;
 #if IS_ENABLED(CONFIG_DEBUG_FS)
 	struct dentry *dbg_dir;
 #endif
 };
 
+static inline unsigned int nbd_blksize(struct nbd_config *config)
+{
+	return 1u << config->blksize_bits;
+}
+
 struct nbd_device {
 	struct blk_mq_tag_set tag_set;
 
@@ -146,7 +151,7 @@
 
 #define NBD_MAGIC 0x68797548
 
-#define NBD_DEF_BLKSIZE 1024
+#define NBD_DEF_BLKSIZE_BITS 10
 
 static unsigned int nbds_max = 16;
 static int max_part = 16;
@@ -317,12 +322,12 @@
 		loff_t blksize)
 {
 	if (!blksize)
-		blksize = NBD_DEF_BLKSIZE;
+		blksize = 1u << NBD_DEF_BLKSIZE_BITS;
 	if (blksize < 512 || blksize > PAGE_SIZE || !is_power_of_2(blksize))
 		return -EINVAL;
 
 	nbd->config->bytesize = bytesize;
-	nbd->config->blksize = blksize;
+	nbd->config->blksize_bits = __ffs(blksize);
 
 	if (!nbd->task_recv)
 		return 0;
@@ -1337,7 +1342,7 @@
 		args->index = i;
 		queue_work(nbd->recv_workq, &args->work);
 	}
-	return nbd_set_size(nbd, config->bytesize, config->blksize);
+	return nbd_set_size(nbd, config->bytesize, nbd_blksize(config));
 }
 
 static int nbd_start_device_ioctl(struct nbd_device *nbd, struct block_device *bdev)
@@ -1406,11 +1411,11 @@
 	case NBD_SET_BLKSIZE:
 		return nbd_set_size(nbd, config->bytesize, arg);
 	case NBD_SET_SIZE:
-		return nbd_set_size(nbd, arg, config->blksize);
+		return nbd_set_size(nbd, arg, nbd_blksize(config));
 	case NBD_SET_SIZE_BLOCKS:
-		if (check_mul_overflow((loff_t)arg, config->blksize, &bytesize))
+		if (check_shl_overflow(arg, config->blksize_bits, &bytesize))
 			return -EINVAL;
-		return nbd_set_size(nbd, bytesize, config->blksize);
+		return nbd_set_size(nbd, bytesize, nbd_blksize(config));
 	case NBD_SET_TIMEOUT:
 		nbd_set_cmd_timeout(nbd, arg);
 		return 0;
@@ -1476,7 +1481,7 @@
 	atomic_set(&config->recv_threads, 0);
 	init_waitqueue_head(&config->recv_wq);
 	init_waitqueue_head(&config->conn_wait);
-	config->blksize = NBD_DEF_BLKSIZE;
+	config->blksize_bits = NBD_DEF_BLKSIZE_BITS;
 	atomic_set(&config->live_connections, 0);
 	try_module_get(THIS_MODULE);
 	return config;
@@ -1604,7 +1609,7 @@
 	debugfs_create_file("tasks", 0444, dir, nbd, &nbd_dbg_tasks_fops);
 	debugfs_create_u64("size_bytes", 0444, dir, &config->bytesize);
 	debugfs_create_u32("timeout", 0444, dir, &nbd->tag_set.timeout);
-	debugfs_create_u64("blocksize", 0444, dir, &config->blksize);
+	debugfs_create_u32("blocksize_bits", 0444, dir, &config->blksize_bits);
 	debugfs_create_file("flags", 0444, dir, nbd, &nbd_dbg_flags_fops);
 
 	return 0;
@@ -1826,7 +1831,7 @@
 static int nbd_genl_size_set(struct genl_info *info, struct nbd_device *nbd)
 {
 	struct nbd_config *config = nbd->config;
-	u64 bsize = config->blksize;
+	u64 bsize = nbd_blksize(config);
 	u64 bytes = config->bytesize;
 
 	if (info->attrs[NBD_ATTR_SIZE_BYTES])
@@ -1835,7 +1840,7 @@
 	if (info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES])
 		bsize = nla_get_u64(info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]);
 
-	if (bytes != config->bytesize || bsize != config->blksize)
+	if (bytes != config->bytesize || bsize != nbd_blksize(config))
 		return nbd_set_size(nbd, bytes, bsize);
 	return 0;
 }
diff --git a/drivers/block/rnbd/rnbd-clt-sysfs.c b/drivers/block/rnbd/rnbd-clt-sysfs.c
index 4b93fd8..44e45af 100644
--- a/drivers/block/rnbd/rnbd-clt-sysfs.c
+++ b/drivers/block/rnbd/rnbd-clt-sysfs.c
@@ -71,8 +71,10 @@
 	int opt_mask = 0;
 	int token;
 	int ret = -EINVAL;
-	int i, dest_port, nr_poll_queues;
+	int nr_poll_queues = 0;
+	int dest_port = 0;
 	int p_cnt = 0;
+	int i;
 
 	options = kstrdup(buf, GFP_KERNEL);
 	if (!options)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index ae8fe54..6c0c3d0 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5700,10 +5700,6 @@
 	disk->flags |= GENHD_FL_EXT_DEVT;
 	disk->events |= DISK_EVENT_MEDIA_CHANGE;
 	mddev->gendisk = disk;
-	/* As soon as we call add_disk(), another thread could get
-	 * through to md_open, so make sure it doesn't get too far
-	 */
-	mutex_lock(&mddev->open_mutex);
 	add_disk(disk);
 
 	error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
@@ -5718,7 +5714,6 @@
 	if (mddev->kobj.sd &&
 	    sysfs_create_group(&mddev->kobj, &md_bitmap_group))
 		pr_debug("pointless warning\n");
-	mutex_unlock(&mddev->open_mutex);
  abort:
 	mutex_unlock(&disks_mutex);
 	if (!error && mddev->kobj.sd) {
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 587385b..f8dd664 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -978,6 +978,7 @@
 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req)
 {
 	struct nvme_command *cmd = nvme_req(req)->cmd;
+	struct nvme_ctrl *ctrl = nvme_req(req)->ctrl;
 	blk_status_t ret = BLK_STS_OK;
 
 	if (!(req->rq_flags & RQF_DONTPREP)) {
@@ -1026,7 +1027,8 @@
 		return BLK_STS_IOERR;
 	}
 
-	nvme_req(req)->genctr++;
+	if (!(ctrl->quirks & NVME_QUIRK_SKIP_CID_GEN))
+		nvme_req(req)->genctr++;
 	cmd->common.command_id = nvme_cid(req);
 	trace_nvme_setup_cmd(req, cmd);
 	return ret;
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 9871c0c..ed79a6c 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -138,6 +138,12 @@
 	 * 48 bits.
 	 */
 	NVME_QUIRK_DMA_ADDRESS_BITS_48		= (1 << 16),
+
+	/*
+	 * The controller requires the command_id value be be limited, so skip
+	 * encoding the generation sequence number.
+	 */
+	NVME_QUIRK_SKIP_CID_GEN			= (1 << 17),
 };
 
 /*
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 7fc992a..149ecf7 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3369,7 +3369,8 @@
 	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2005),
 		.driver_data = NVME_QUIRK_SINGLE_VECTOR |
 				NVME_QUIRK_128_BYTES_SQES |
-				NVME_QUIRK_SHARED_TAGS },
+				NVME_QUIRK_SHARED_TAGS |
+				NVME_QUIRK_SKIP_CID_GEN },
 
 	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
 	{ 0, }
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index c221e4c..fa91f39 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1605,6 +1605,14 @@
 	if (bt == NULL)
 		return -EINVAL;
 
+	if (bt->trace_state == Blktrace_running) {
+		bt->trace_state = Blktrace_stopped;
+		spin_lock_irq(&running_trace_lock);
+		list_del_init(&bt->running_list);
+		spin_unlock_irq(&running_trace_lock);
+		relay_flush(bt->rchan);
+	}
+
 	put_probe_ref();
 	synchronize_rcu();
 	blk_trace_free(bt);