Merge tag 'for-4.19/post-20180822' of git://git.kernel.dk/linux-block

Pull more block updates from Jens Axboe:

 - Set of bcache fixes and changes (Coly)

 - The flush warn fix (me)

 - Small series of BFQ fixes (Paolo)

 - wbt hang fix (Ming)

 - blktrace fix (Steven)

 - blk-mq hardware queue count update fix (Jianchao)

 - Various little fixes

* tag 'for-4.19/post-20180822' of git://git.kernel.dk/linux-block: (31 commits)
  block/DAC960.c: make some arrays static const, shrinks object size
  blk-mq: sync the update nr_hw_queues with blk_mq_queue_tag_busy_iter
  blk-mq: init hctx sched after update ctx and hctx mapping
  block: remove duplicate initialization
  tracing/blktrace: Fix to allow setting same value
  pktcdvd: fix setting of 'ret' error return for a few cases
  block: change return type to bool
  block, bfq: return nbytes and not zero from struct cftype .write() method
  block, bfq: improve code of bfq_bfqq_charge_time
  block, bfq: reduce write overcharge
  block, bfq: always update the budget of an entity when needed
  block, bfq: readd missing reset of parent-entity service
  blk-wbt: fix IO hang in wbt_wait()
  block: don't warn for flush on read-only device
  bcache: add the missing comments for smp_mb()/smp_wmb()
  bcache: remove unnecessary space before ioctl function pointer arguments
  bcache: add missing SPDX header
  bcache: move open brace at end of function definitions to next line
  bcache: add static const prefix to char * array declarations
  bcache: fix code comments style
  ...

43 files changed, 879 insertions, 656 deletions

diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index a9e8633388f4..58c6efa9f9a9 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -913,7 +913,8 @@ static ssize_t bfq_io_set_weight(struct kernfs_open_file *of,
 	if (ret)
 		return ret;
 
-	return bfq_io_set_weight_legacy(of_css(of), NULL, weight);
+	ret = bfq_io_set_weight_legacy(of_css(of), NULL, weight);
+	return ret ?: nbytes;
 }
 
 #ifdef CONFIG_DEBUG_BLK_CGROUP
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 41d9036b1822..653100fb719e 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -187,11 +187,25 @@ static const int bfq_stats_min_budgets = 194;
 static const int bfq_default_max_budget = 16 * 1024;
 
 /*
- * Async to sync throughput distribution is controlled as follows:
- * when an async request is served, the entity is charged the number
- * of sectors of the request, multiplied by the factor below
+ * When a sync request is dispatched, the queue that contains that
+ * request, and all the ancestor entities of that queue, are charged
+ * with the number of sectors of the request. In constrast, if the
+ * request is async, then the queue and its ancestor entities are
+ * charged with the number of sectors of the request, multiplied by
+ * the factor below. This throttles the bandwidth for async I/O,
+ * w.r.t. to sync I/O, and it is done to counter the tendency of async
+ * writes to steal I/O throughput to reads.
+ *
+ * The current value of this parameter is the result of a tuning with
+ * several hardware and software configurations. We tried to find the
+ * lowest value for which writes do not cause noticeable problems to
+ * reads. In fact, the lower this parameter, the stabler I/O control,
+ * in the following respect.  The lower this parameter is, the less
+ * the bandwidth enjoyed by a group decreases
+ * - when the group does writes, w.r.t. to when it does reads;
+ * - when other groups do reads, w.r.t. to when they do writes.
  */
-static const int bfq_async_charge_factor = 10;
+static const int bfq_async_charge_factor = 3;
 
 /* Default timeout values, in jiffies, approximating CFQ defaults. */
 const int bfq_timeout = HZ / 8;
@@ -853,16 +867,7 @@ static unsigned long bfq_serv_to_charge(struct request *rq,
 	if (bfq_bfqq_sync(bfqq) || bfqq->wr_coeff > 1)
 		return blk_rq_sectors(rq);
 
-	/*
-	 * If there are no weight-raised queues, then amplify service
-	 * by just the async charge factor; otherwise amplify service
-	 * by twice the async charge factor, to further reduce latency
-	 * for weight-raised queues.
-	 */
-	if (bfqq->bfqd->wr_busy_queues == 0)
-		return blk_rq_sectors(rq) * bfq_async_charge_factor;
-
-	return blk_rq_sectors(rq) * 2 * bfq_async_charge_factor;
+	return blk_rq_sectors(rq) * bfq_async_charge_factor;
 }
 
 /**
@@ -3298,6 +3303,27 @@ void bfq_bfqq_expire(struct bfq_data *bfqd,
 		 */
 	} else
 		entity->service = 0;
+
+	/*
+	 * Reset the received-service counter for every parent entity.
+	 * Differently from what happens with bfqq->entity.service,
+	 * the resetting of this counter never needs to be postponed
+	 * for parent entities. In fact, in case bfqq may have a
+	 * chance to go on being served using the last, partially
+	 * consumed budget, bfqq->entity.service needs to be kept,
+	 * because if bfqq then actually goes on being served using
+	 * the same budget, the last value of bfqq->entity.service is
+	 * needed to properly decrement bfqq->entity.budget by the
+	 * portion already consumed. In contrast, it is not necessary
+	 * to keep entity->service for parent entities too, because
+	 * the bubble up of the new value of bfqq->entity.budget will
+	 * make sure that the budgets of parent entities are correct,
+	 * even in case bfqq and thus parent entities go on receiving
+	 * service with the same budget.
+	 */
+	entity = entity->parent;
+	for_each_entity(entity)
+		entity->service = 0;
 }
 
 /*
diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
index dbc07b456059..ae52bff43ce4 100644
--- a/block/bfq-wf2q.c
+++ b/block/bfq-wf2q.c
@@ -130,10 +130,14 @@ static bool bfq_update_next_in_service(struct bfq_sched_data *sd,
 	if (!change_without_lookup) /* lookup needed */
 		next_in_service = bfq_lookup_next_entity(sd, expiration);
 
-	if (next_in_service)
-		parent_sched_may_change = !sd->next_in_service ||
+	if (next_in_service) {
+		bool new_budget_triggers_change =
 			bfq_update_parent_budget(next_in_service);
 
+		parent_sched_may_change = !sd->next_in_service ||
+			new_budget_triggers_change;
+	}
+
 	sd->next_in_service = next_in_service;
 
 	if (!next_in_service)
@@ -877,15 +881,11 @@ void bfq_bfqq_charge_time(struct bfq_data *bfqd, struct bfq_queue *bfqq,
 			  unsigned long time_ms)
 {
 	struct bfq_entity *entity = &bfqq->entity;
-	int tot_serv_to_charge = entity->service;
-	unsigned int timeout_ms = jiffies_to_msecs(bfq_timeout);
-
-	if (time_ms > 0 && time_ms < timeout_ms)
-		tot_serv_to_charge =
-			(bfqd->bfq_max_budget * time_ms) / timeout_ms;
-
-	if (tot_serv_to_charge < entity->service)
-		tot_serv_to_charge = entity->service;
+	unsigned long timeout_ms = jiffies_to_msecs(bfq_timeout);
+	unsigned long bounded_time_ms = min(time_ms, timeout_ms);
+	int serv_to_charge_for_time =
+		(bfqd->bfq_max_budget * bounded_time_ms) / timeout_ms;
+	int tot_serv_to_charge = max(serv_to_charge_for_time, entity->service);
 
 	/* Increase budget to avoid inconsistencies */
 	if (tot_serv_to_charge > entity->budget)
diff --git a/block/blk-core.c b/block/blk-core.c
index 12550340418d..dee56c282efb 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1036,7 +1036,6 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id,
 		    laptop_mode_timer_fn, 0);
 	timer_setup(&q->timeout, blk_rq_timed_out_timer, 0);
 	INIT_WORK(&q->timeout_work, NULL);
-	INIT_LIST_HEAD(&q->queue_head);
 	INIT_LIST_HEAD(&q->timeout_list);
 	INIT_LIST_HEAD(&q->icq_list);
 #ifdef CONFIG_BLK_CGROUP
@@ -2162,7 +2161,9 @@ static inline bool should_fail_request(struct hd_struct *part,
 
 static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part)
 {
-	if (part->policy && op_is_write(bio_op(bio))) {
+	const int op = bio_op(bio);
+
+	if (part->policy && (op_is_write(op) && !op_is_flush(op))) {
 		char b[BDEVNAME_SIZE];
 
 		WARN_ONCE(1,
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index cf9c66c6d35a..29bfe8017a2d 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -462,50 +462,6 @@ static void blk_mq_sched_tags_teardown(struct request_queue *q)
 		blk_mq_sched_free_tags(set, hctx, i);
 }
 
-int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
-			   unsigned int hctx_idx)
-{
-	struct elevator_queue *e = q->elevator;
-	int ret;
-
-	if (!e)
-		return 0;
-
-	ret = blk_mq_sched_alloc_tags(q, hctx, hctx_idx);
-	if (ret)
-		return ret;
-
-	if (e->type->ops.mq.init_hctx) {
-		ret = e->type->ops.mq.init_hctx(hctx, hctx_idx);
-		if (ret) {
-			blk_mq_sched_free_tags(q->tag_set, hctx, hctx_idx);
-			return ret;
-		}
-	}
-
-	blk_mq_debugfs_register_sched_hctx(q, hctx);
-
-	return 0;
-}
-
-void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
-			    unsigned int hctx_idx)
-{
-	struct elevator_queue *e = q->elevator;
-
-	if (!e)
-		return;
-
-	blk_mq_debugfs_unregister_sched_hctx(hctx);
-
-	if (e->type->ops.mq.exit_hctx && hctx->sched_data) {
-		e->type->ops.mq.exit_hctx(hctx, hctx_idx);
-		hctx->sched_data = NULL;
-	}
-
-	blk_mq_sched_free_tags(q->tag_set, hctx, hctx_idx);
-}
-
 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e)
 {
 	struct blk_mq_hw_ctx *hctx;
diff --git a/block/blk-mq-sched.h b/block/blk-mq-sched.h
index 0cb8f938dff9..4e028ee42430 100644
--- a/block/blk-mq-sched.h
+++ b/block/blk-mq-sched.h
@@ -28,11 +28,6 @@ void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx);
 int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e);
 void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e);
 
-int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
-			   unsigned int hctx_idx);
-void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
-			    unsigned int hctx_idx);
-
 static inline bool
 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio)
 {
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 816923bf874d..94e1ed667b6e 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -320,6 +320,18 @@ void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
 	struct blk_mq_hw_ctx *hctx;
 	int i;
 
+	/*
+	 * __blk_mq_update_nr_hw_queues will update the nr_hw_queues and
+	 * queue_hw_ctx after freeze the queue. So we could use q_usage_counter
+	 * to avoid race with it. __blk_mq_update_nr_hw_queues will users
+	 * synchronize_rcu to ensure all of the users go out of the critical
+	 * section below and see zeroed q_usage_counter.
+	 */
+	rcu_read_lock();
+	if (percpu_ref_is_zero(&q->q_usage_counter)) {
+		rcu_read_unlock();
+		return;
+	}
 
 	queue_for_each_hw_ctx(q, hctx, i) {
 		struct blk_mq_tags *tags = hctx->tags;
@@ -335,7 +347,7 @@ void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
 			bt_for_each(hctx, &tags->breserved_tags, fn, priv, true);
 		bt_for_each(hctx, &tags->bitmap_tags, fn, priv, false);
 	}
-
+	rcu_read_unlock();
 }
 
 static int bt_alloc(struct sbitmap_queue *bt, unsigned int depth,
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 72a0033ccee9..85a1c1a59c72 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2145,8 +2145,6 @@ static void blk_mq_exit_hctx(struct request_queue *q,
 	if (set->ops->exit_request)
 		set->ops->exit_request(set, hctx->fq->flush_rq, hctx_idx);
 
-	blk_mq_sched_exit_hctx(q, hctx, hctx_idx);
-
 	if (set->ops->exit_hctx)
 		set->ops->exit_hctx(hctx, hctx_idx);
 
@@ -2214,12 +2212,9 @@ static int blk_mq_init_hctx(struct request_queue *q,
 	    set->ops->init_hctx(hctx, set->driver_data, hctx_idx))
 		goto free_bitmap;
 
-	if (blk_mq_sched_init_hctx(q, hctx, hctx_idx))
-		goto exit_hctx;
-
 	hctx->fq = blk_alloc_flush_queue(q, hctx->numa_node, set->cmd_size);
 	if (!hctx->fq)
-		goto sched_exit_hctx;
+		goto exit_hctx;
 
 	if (blk_mq_init_request(set, hctx->fq->flush_rq, hctx_idx, node))
 		goto free_fq;
@@ -2233,8 +2228,6 @@ static int blk_mq_init_hctx(struct request_queue *q,
 
  free_fq:
 	kfree(hctx->fq);
- sched_exit_hctx:
-	blk_mq_sched_exit_hctx(q, hctx, hctx_idx);
  exit_hctx:
 	if (set->ops->exit_hctx)
 		set->ops->exit_hctx(hctx, hctx_idx);
@@ -2896,10 +2889,81 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr)
 	return ret;
 }
 
+/*
+ * request_queue and elevator_type pair.
+ * It is just used by __blk_mq_update_nr_hw_queues to cache
+ * the elevator_type associated with a request_queue.
+ */
+struct blk_mq_qe_pair {
+	struct list_head node;
+	struct request_queue *q;
+	struct elevator_type *type;
+};
+
+/*
+ * Cache the elevator_type in qe pair list and switch the
+ * io scheduler to 'none'
+ */
+static bool blk_mq_elv_switch_none(struct list_head *head,
+		struct request_queue *q)
+{
+	struct blk_mq_qe_pair *qe;
+
+	if (!q->elevator)
+		return true;
+
+	qe = kmalloc(sizeof(*qe), GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY);
+	if (!qe)
+		return false;
+
+	INIT_LIST_HEAD(&qe->node);
+	qe->q = q;
+	qe->type = q->elevator->type;
+	list_add(&qe->node, head);
+
+	mutex_lock(&q->sysfs_lock);
+	/*
+	 * After elevator_switch_mq, the previous elevator_queue will be
+	 * released by elevator_release. The reference of the io scheduler
+	 * module get by elevator_get will also be put. So we need to get
+	 * a reference of the io scheduler module here to prevent it to be
+	 * removed.
+	 */
+	__module_get(qe->type->elevator_owner);
+	elevator_switch_mq(q, NULL);
+	mutex_unlock(&q->sysfs_lock);
+
+	return true;
+}
+
+static void blk_mq_elv_switch_back(struct list_head *head,
+		struct request_queue *q)
+{
+	struct blk_mq_qe_pair *qe;
+	struct elevator_type *t = NULL;
+
+	list_for_each_entry(qe, head, node)
+		if (qe->q == q) {
+			t = qe->type;
+			break;
+		}
+
+	if (!t)
+		return;
+
+	list_del(&qe->node);
+	kfree(qe);
+
+	mutex_lock(&q->sysfs_lock);
+	elevator_switch_mq(q, t);
+	mutex_unlock(&q->sysfs_lock);
+}
+
 static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
 							int nr_hw_queues)
 {
 	struct request_queue *q;
+	LIST_HEAD(head);
 
 	lockdep_assert_held(&set->tag_list_lock);
 
@@ -2910,6 +2974,18 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
 
 	list_for_each_entry(q, &set->tag_list, tag_set_list)
 		blk_mq_freeze_queue(q);
+	/*
+	 * Sync with blk_mq_queue_tag_busy_iter.
+	 */
+	synchronize_rcu();
+	/*
+	 * Switch IO scheduler to 'none', cleaning up the data associated
+	 * with the previous scheduler. We will switch back once we are done
+	 * updating the new sw to hw queue mappings.
+	 */
+	list_for_each_entry(q, &set->tag_list, tag_set_list)
+		if (!blk_mq_elv_switch_none(&head, q))
+			goto switch_back;
 
 	set->nr_hw_queues = nr_hw_queues;
 	blk_mq_update_queue_map(set);
@@ -2918,6 +2994,10 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
 		blk_mq_queue_reinit(q);
 	}
 
+switch_back:
+	list_for_each_entry(q, &set->tag_list, tag_set_list)
+		blk_mq_elv_switch_back(&head, q);
+
 	list_for_each_entry(q, &set->tag_list, tag_set_list)
 		blk_mq_unfreeze_queue(q);
 }
diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index 1d94a20374fc..bb93c7c2b182 100644
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -576,12 +576,8 @@ static void wbt_wait(struct rq_qos *rqos, struct bio *bio, spinlock_t *lock)
 	struct rq_wb *rwb = RQWB(rqos);
 	enum wbt_flags flags;
 
-	if (!rwb_enabled(rwb))
-		return;
-
 	flags = bio_to_wbt_flags(rwb, bio);
-
-	if (!wbt_should_throttle(rwb, bio)) {
+	if (!(flags & WBT_TRACKED)) {
 		if (flags & WBT_READ)
 			wb_timestamp(rwb, &rwb->last_issue);
 		return;
diff --git a/block/blk.h b/block/blk.h
index d4d67e948920..9db4e389582c 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -234,6 +234,8 @@ static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq
 
 int elevator_init(struct request_queue *);
 int elevator_init_mq(struct request_queue *q);
+int elevator_switch_mq(struct request_queue *q,
+			      struct elevator_type *new_e);
 void elevator_exit(struct request_queue *, struct elevator_queue *);
 int elv_register_queue(struct request_queue *q);
 void elv_unregister_queue(struct request_queue *q);
@@ -297,7 +299,7 @@ extern int blk_update_nr_requests(struct request_queue *, unsigned int);
  *	b) the queue had IO stats enabled when this request was started, and
  *	c) it's a file system request
  */
-static inline int blk_do_io_stat(struct request *rq)
+static inline bool blk_do_io_stat(struct request *rq)
 {
 	return rq->rq_disk &&
 	       (rq->rq_flags & RQF_IO_STAT) &&
diff --git a/block/elevator.c b/block/elevator.c
index fa828b5bfd4b..5ea6e7d600e4 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -933,16 +933,13 @@ void elv_unregister(struct elevator_type *e)
 }
 EXPORT_SYMBOL_GPL(elv_unregister);
 
-static int elevator_switch_mq(struct request_queue *q,
+int elevator_switch_mq(struct request_queue *q,
 			      struct elevator_type *new_e)
 {
 	int ret;
 
 	lockdep_assert_held(&q->sysfs_lock);
 
-	blk_mq_freeze_queue(q);
-	blk_mq_quiesce_queue(q);
-
 	if (q->elevator) {
 		if (q->elevator->registered)
 			elv_unregister_queue(q);
@@ -968,8 +965,6 @@ static int elevator_switch_mq(struct request_queue *q,
 		blk_add_trace_msg(q, "elv switch: none");
 
 out:
-	blk_mq_unquiesce_queue(q);
-	blk_mq_unfreeze_queue(q);
 	return ret;
 }
 
@@ -1021,8 +1016,17 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
 
 	lockdep_assert_held(&q->sysfs_lock);
 
-	if (q->mq_ops)
-		return elevator_switch_mq(q, new_e);
+	if (q->mq_ops) {
+		blk_mq_freeze_queue(q);
+		blk_mq_quiesce_queue(q);
+
+		err = elevator_switch_mq(q, new_e);
+
+		blk_mq_unquiesce_queue(q);
+		blk_mq_unfreeze_queue(q);
+
+		return err;
+	}
 
 	/*
 	 * Turn on BYPASS and drain all requests w/ elevator private data.
diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index f99e5c883368..581312ac375f 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -2428,16 +2428,20 @@ static bool DAC960_V2_ReportDeviceConfiguration(DAC960_Controller_T
     {
       DAC960_V2_LogicalDeviceInfo_T *LogicalDeviceInfo =
 	Controller->V2.LogicalDeviceInformation[LogicalDriveNumber];
-      unsigned char *ReadCacheStatus[] = { "Read Cache Disabled",
-					   "Read Cache Enabled",
-					   "Read Ahead Enabled",
-					   "Intelligent Read Ahead Enabled",
-					   "-", "-", "-", "-" };
-      unsigned char *WriteCacheStatus[] = { "Write Cache Disabled",
-					    "Logical Device Read Only",
-					    "Write Cache Enabled",
-					    "Intelligent Write Cache Enabled",
-					    "-", "-", "-", "-" };
+      static const unsigned char *ReadCacheStatus[] = {
+        "Read Cache Disabled",
+        "Read Cache Enabled",
+        "Read Ahead Enabled",
+        "Intelligent Read Ahead Enabled",
+        "-", "-", "-", "-"
+      };
+      static const unsigned char *WriteCacheStatus[] = {
+        "Write Cache Disabled",
+        "Logical Device Read Only",
+        "Write Cache Enabled",
+        "Intelligent Write Cache Enabled",
+        "-", "-", "-", "-"
+      };
       unsigned char *GeometryTranslation;
       if (LogicalDeviceInfo == NULL) continue;
       switch (LogicalDeviceInfo->DriveGeometry)
@@ -4339,14 +4343,16 @@ static void DAC960_V1_ProcessCompletedCommand(DAC960_Command_T *Command)
 static void DAC960_V2_ReadWriteError(DAC960_Command_T *Command)
 {
   DAC960_Controller_T *Controller = Command->Controller;
-  unsigned char *SenseErrors[] = { "NO SENSE", "RECOVERED ERROR",
-				   "NOT READY", "MEDIUM ERROR",
-				   "HARDWARE ERROR", "ILLEGAL REQUEST",
-				   "UNIT ATTENTION", "DATA PROTECT",
-				   "BLANK CHECK", "VENDOR-SPECIFIC",
-				   "COPY ABORTED", "ABORTED COMMAND",
-				   "EQUAL", "VOLUME OVERFLOW",
-				   "MISCOMPARE", "RESERVED" };
+  static const unsigned char *SenseErrors[] = {
+    "NO SENSE", "RECOVERED ERROR",
+    "NOT READY", "MEDIUM ERROR",
+    "HARDWARE ERROR", "ILLEGAL REQUEST",
+    "UNIT ATTENTION", "DATA PROTECT",
+    "BLANK CHECK", "VENDOR-SPECIFIC",
+    "COPY ABORTED", "ABORTED COMMAND",
+    "EQUAL", "VOLUME OVERFLOW",
+    "MISCOMPARE", "RESERVED"
+  };
   unsigned char *CommandName = "UNKNOWN";
   switch (Command->CommandType)
     {
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index e285413d4a75..6f1d25c1eb64 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2740,6 +2740,7 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
 	pd->write_congestion_on  = write_congestion_on;
 	pd->write_congestion_off = write_congestion_off;
 
+	ret = -ENOMEM;
 	disk = alloc_disk(1);
 	if (!disk)
 		goto out_mem;
diff --git a/drivers/md/bcache/Kconfig b/drivers/md/bcache/Kconfig
index af247298409a..f6e0a8b3a61e 100644
--- a/drivers/md/bcache/Kconfig
+++ b/drivers/md/bcache/Kconfig
@@ -2,7 +2,7 @@
 config BCACHE
 	tristate "Block device as cache"
 	select CRC64
-	---help---
+	help
 	Allows a block device to be used as cache for other devices; uses
 	a btree for indexing and the layout is optimized for SSDs.
 
@@ -11,7 +11,7 @@ config BCACHE
 config BCACHE_DEBUG
 	bool "Bcache debugging"
 	depends on BCACHE
-	---help---
+	help
 	Don't select this option unless you're a developer
 
 	Enables extra debugging tools, allows expensive runtime checks to be
@@ -21,7 +21,7 @@ config BCACHE_CLOSURES_DEBUG
 	bool "Debug closures"
 	depends on BCACHE
 	select DEBUG_FS
-	---help---
+	help
 	Keeps all active closures in a linked list and provides a debugfs
 	interface to list them, which makes it possible to see asynchronous
 	operations that get stuck.
diff --git a/drivers/md/bcache/alloc.c b/drivers/md/bcache/alloc.c
index 7fa2631b422c..7a28232d868b 100644
--- a/drivers/md/bcache/alloc.c
+++ b/drivers/md/bcache/alloc.c
@@ -87,8 +87,8 @@ void bch_rescale_priorities(struct cache_set *c, int sectors)
 {
 	struct cache *ca;
 	struct bucket *b;
-	unsigned next = c->nbuckets * c->sb.bucket_size / 1024;
-	unsigned i;
+	unsigned int next = c->nbuckets * c->sb.bucket_size / 1024;
+	unsigned int i;
 	int r;
 
 	atomic_sub(sectors, &c->rescale);
@@ -169,7 +169,7 @@ static void bch_invalidate_one_bucket(struct cache *ca, struct bucket *b)
 
 #define bucket_prio(b)							\
 ({									\
-	unsigned min_prio = (INITIAL_PRIO - ca->set->min_prio) / 8;	\
+	unsigned int min_prio = (INITIAL_PRIO - ca->set->min_prio) / 8;	\
 									\
 	(b->prio - ca->set->min_prio + min_prio) * GC_SECTORS_USED(b);	\
 })
@@ -244,6 +244,7 @@ static void invalidate_buckets_random(struct cache *ca)
 
 	while (!fifo_full(&ca->free_inc)) {
 		size_t n;
+
 		get_random_bytes(&n, sizeof(n));
 
 		n %= (size_t) (ca->sb.nbuckets - ca->sb.first_bucket);
@@ -301,7 +302,7 @@ do {									\
 
 static int bch_allocator_push(struct cache *ca, long bucket)
 {
-	unsigned i;
+	unsigned int i;
 
 	/* Prios/gens are actually the most important reserve */
 	if (fifo_push(&ca->free[RESERVE_PRIO], bucket))
@@ -385,7 +386,7 @@ out:
 
 /* Allocation */
 
-long bch_bucket_alloc(struct cache *ca, unsigned reserve, bool wait)
+long bch_bucket_alloc(struct cache *ca, unsigned int reserve, bool wait)
 {
 	DEFINE_WAIT(w);
 	struct bucket *b;
@@ -421,7 +422,7 @@ out:
 	if (expensive_debug_checks(ca->set)) {
 		size_t iter;
 		long i;
-		unsigned j;
+		unsigned int j;
 
 		for (iter = 0; iter < prio_buckets(ca) * 2; iter++)
 			BUG_ON(ca->prio_buckets[iter] == (uint64_t) r);
@@ -470,14 +471,14 @@ void __bch_bucket_free(struct cache *ca, struct bucket *b)
 
 void bch_bucket_free(struct cache_set *c, struct bkey *k)
 {
-	unsigned i;
+	unsigned int i;
 
 	for (i = 0; i < KEY_PTRS(k); i++)
 		__bch_bucket_free(PTR_CACHE(c, k, i),
 				  PTR_BUCKET(c, k, i));
 }
 
-int __bch_bucket_alloc_set(struct cache_set *c, unsigned reserve,
+int __bch_bucket_alloc_set(struct cache_set *c, unsigned int reserve,
 			   struct bkey *k, int n, bool wait)
 {
 	int i;
@@ -510,10 +511,11 @@ err:
 	return -1;
 }
 
-int bch_bucket_alloc_set(struct cache_set *c, unsigned reserve,
+int bch_bucket_alloc_set(struct cache_set *c, unsigned int reserve,
 			 struct bkey *k, int n, bool wait)
 {
 	int ret;
+
 	mutex_lock(&c->bucket_lock);
 	ret = __bch_bucket_alloc_set(c, reserve, k, n, wait);
 	mutex_unlock(&c->bucket_lock);
@@ -524,8 +526,8 @@ int bch_bucket_alloc_set(struct cache_set *c, unsigned reserve,
 
 struct open_bucket {
 	struct list_head	list;
-	unsigned		last_write_point;
-	unsigned		sectors_free;
+	unsigned int		last_write_point;
+	unsigned int		sectors_free;
 	BKEY_PADDED(key);
 };
 
@@ -556,7 +558,7 @@ struct open_bucket {
  */
 static struct open_bucket *pick_data_bucket(struct cache_set *c,
 					    const struct bkey *search,
-					    unsigned write_point,
+					    unsigned int write_point,
 					    struct bkey *alloc)
 {
 	struct open_bucket *ret, *ret_task = NULL;
@@ -595,12 +597,16 @@ found:
  *
  * If s->writeback is true, will not fail.
  */
-bool bch_alloc_sectors(struct cache_set *c, struct bkey *k, unsigned sectors,
-		       unsigned write_point, unsigned write_prio, bool wait)
+bool bch_alloc_sectors(struct cache_set *c,
+		       struct bkey *k,
+		       unsigned int sectors,
+		       unsigned int write_point,
+		       unsigned int write_prio,
+		       bool wait)
 {
 	struct open_bucket *b;
 	BKEY_PADDED(key) alloc;
-	unsigned i;
+	unsigned int i;
 
 	/*
 	 * We might have to allocate a new bucket, which we can't do with a
@@ -613,7 +619,7 @@ bool bch_alloc_sectors(struct cache_set *c, struct bkey *k, unsigned sectors,
 	spin_lock(&c->data_bucket_lock);
 
 	while (!(b = pick_data_bucket(c, k, write_point, &alloc.key))) {
-		unsigned watermark = write_prio
+		unsigned int watermark = write_prio
 			? RESERVE_MOVINGGC
 			: RESERVE_NONE;
 
@@ -702,6 +708,7 @@ int bch_open_buckets_alloc(struct cache_set *c)
 
 	for (i = 0; i < MAX_OPEN_BUCKETS; i++) {
 		struct open_bucket *b = kzalloc(sizeof(*b), GFP_KERNEL);
+
 		if (!b)
 			return -ENOMEM;
 
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 05f82ff6f016..83504dd8100a 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -252,7 +252,7 @@ struct bcache_device {
 	struct kobject		kobj;
 
 	struct cache_set	*c;
-	unsigned		id;
+	unsigned int		id;
 #define BCACHEDEVNAME_SIZE	12
 	char			name[BCACHEDEVNAME_SIZE];
 
@@ -264,18 +264,19 @@ struct bcache_device {
 #define BCACHE_DEV_UNLINK_DONE		2
 #define BCACHE_DEV_WB_RUNNING		3
 #define BCACHE_DEV_RATE_DW_RUNNING	4
-	unsigned		nr_stripes;
-	unsigned		stripe_size;
+	unsigned int		nr_stripes;
+	unsigned int		stripe_size;
 	atomic_t		*stripe_sectors_dirty;
 	unsigned long		*full_dirty_stripes;
 
 	struct bio_set		bio_split;
 
-	unsigned		data_csum:1;
+	unsigned int		data_csum:1;
 
-	int (*cache_miss)(struct btree *, struct search *,
-			  struct bio *, unsigned);
-	int (*ioctl) (struct bcache_device *, fmode_t, unsigned, unsigned long);
+	int (*cache_miss)(struct btree *b, struct search *s,
+			  struct bio *bio, unsigned int sectors);
+	int (*ioctl)(struct bcache_device *d, fmode_t mode,
+		     unsigned int cmd, unsigned long arg);
 };
 
 struct io {
@@ -284,7 +285,7 @@ struct io {
 	struct list_head	lru;
 
 	unsigned long		jiffies;
-	unsigned		sequential;
+	unsigned int		sequential;
 	sector_t		last;
 };
 
@@ -358,18 +359,18 @@ struct cached_dev {
 	struct cache_accounting	accounting;
 
 	/* The rest of this all shows up in sysfs */
-	unsigned		sequential_cutoff;
-	unsigned		readahead;
+	unsigned int		sequential_cutoff;
+	unsigned int		readahead;
 
-	unsigned		io_disable:1;
-	unsigned		verify:1;
-	unsigned		bypass_torture_test:1;
+	unsigned int		io_disable:1;
+	unsigned int		verify:1;
+	unsigned int		bypass_torture_test:1;
 
-	unsigned		partial_stripes_expensive:1;
-	unsigned		writeback_metadata:1;
-	unsigned		writeback_running:1;
+	unsigned int		partial_stripes_expensive:1;
+	unsigned int		writeback_metadata:1;
+	unsigned int		writeback_running:1;
 	unsigned char		writeback_percent;
-	unsigned		writeback_delay;
+	unsigned int		writeback_delay;
 
 	uint64_t		writeback_rate_target;
 	int64_t			writeback_rate_proportional;
@@ -377,16 +378,16 @@ struct cached_dev {
 	int64_t			writeback_rate_integral_scaled;
 	int32_t			writeback_rate_change;
 
-	unsigned		writeback_rate_update_seconds;
-	unsigned		writeback_rate_i_term_inverse;
-	unsigned		writeback_rate_p_term_inverse;
-	unsigned		writeback_rate_minimum;
+	unsigned int		writeback_rate_update_seconds;
+	unsigned int		writeback_rate_i_term_inverse;
+	unsigned int		writeback_rate_p_term_inverse;
+	unsigned int		writeback_rate_minimum;
 
 	enum stop_on_failure	stop_when_cache_set_failed;
 #define DEFAULT_CACHED_DEV_ERROR_LIMIT	64
 	atomic_t		io_errors;
-	unsigned		error_limit;
-	unsigned		offline_seconds;
+	unsigned int		error_limit;
+	unsigned int		offline_seconds;
 
 	char			backing_dev_name[BDEVNAME_SIZE];
 };
@@ -447,7 +448,7 @@ struct cache {
 	 * until a gc finishes - otherwise we could pointlessly burn a ton of
 	 * cpu
 	 */
-	unsigned		invalidate_needs_gc;
+	unsigned int		invalidate_needs_gc;
 
 	bool			discard; /* Get rid of? */
 
@@ -472,7 +473,7 @@ struct gc_stat {
 
 	size_t			nkeys;
 	uint64_t		data;	/* sectors */
-	unsigned		in_use; /* percent */
+	unsigned int		in_use; /* percent */
 };
 
 /*
@@ -518,7 +519,7 @@ struct cache_set {
 	int			caches_loaded;
 
 	struct bcache_device	**devices;
-	unsigned		devices_max_used;
+	unsigned int		devices_max_used;
 	atomic_t		attached_dev_nr;
 	struct list_head	cached_devs;
 	uint64_t		cached_dev_sectors;
@@ -548,7 +549,7 @@ struct cache_set {
 	 * Default number of pages for a new btree node - may be less than a
 	 * full bucket
 	 */
-	unsigned		btree_pages;
+	unsigned int		btree_pages;
 
 	/*
 	 * Lists of struct btrees; lru is the list for structs that have memory
@@ -571,7 +572,7 @@ struct cache_set {
 	struct list_head	btree_cache_freed;
 
 	/* Number of elements in btree_cache + btree_cache_freeable lists */
-	unsigned		btree_cache_used;
+	unsigned int		btree_cache_used;
 
 	/*
 	 * If we need to allocate memory for a new btree node and that
@@ -613,8 +614,8 @@ struct cache_set {
 	uint16_t		min_prio;
 
 	/*
-	 * max(gen - last_gc) for all buckets. When it gets too big we have to gc
-	 * to keep gens from wrapping around.
+	 * max(gen - last_gc) for all buckets. When it gets too big we have to
+	 * gc to keep gens from wrapping around.
 	 */
 	uint8_t			need_gc;
 	struct gc_stat		gc_stats;
@@ -649,7 +650,7 @@ struct cache_set {
 	struct mutex		verify_lock;
 #endif
 
-	unsigned		nr_uuids;
+	unsigned int		nr_uuids;
 	struct uuid_entry	*uuids;
 	BKEY_PADDED(uuid_bucket);
 	struct closure		uuid_write;
@@ -670,12 +671,12 @@ struct cache_set {
 	struct journal		journal;
 
 #define CONGESTED_MAX		1024
-	unsigned		congested_last_us;
+	unsigned int		congested_last_us;
 	atomic_t		congested;
 
 	/* The rest of this all shows up in sysfs */
-	unsigned		congested_read_threshold_us;
-	unsigned		congested_write_threshold_us;
+	unsigned int		congested_read_threshold_us;
+	unsigned int		congested_write_threshold_us;
 
 	struct time_stats	btree_gc_time;
 	struct time_stats	btree_split_time;
@@ -694,16 +695,16 @@ struct cache_set {
 		ON_ERROR_PANIC,
 	}			on_error;
 #define DEFAULT_IO_ERROR_LIMIT 8
-	unsigned		error_limit;
-	unsigned		error_decay;
+	unsigned int		error_limit;
+	unsigned int		error_decay;
 
 	unsigned short		journal_delay_ms;
 	bool			expensive_debug_checks;
-	unsigned		verify:1;
-	unsigned		key_merging_disabled:1;
-	unsigned		gc_always_rewrite:1;
-	unsigned		shrinker_disabled:1;
-	unsigned		copy_gc_enabled:1;
+	unsigned int		verify:1;
+	unsigned int		key_merging_disabled:1;
+	unsigned int		gc_always_rewrite:1;
+	unsigned int		shrinker_disabled:1;
+	unsigned int		copy_gc_enabled:1;
 
 #define BUCKET_HASH_BITS	12
 	struct hlist_head	bucket_hash[1 << BUCKET_HASH_BITS];
@@ -712,7 +713,7 @@ struct cache_set {
 };
 
 struct bbio {
-	unsigned		submit_time_us;
+	unsigned int		submit_time_us;
 	union {
 		struct bkey	key;
 		uint64_t	_pad[3];
@@ -729,10 +730,10 @@ struct bbio {
 
 #define btree_bytes(c)		((c)->btree_pages * PAGE_SIZE)
 #define btree_blocks(b)							\
-	((unsigned) (KEY_SIZE(&b->key) >> (b)->c->block_bits))
+	((unsigned int) (KEY_SIZE(&b->key) >> (b)->c->block_bits))
 
 #define btree_default_blocks(c)						\
-	((unsigned) ((PAGE_SECTORS * (c)->btree_pages) >> (c)->block_bits))
+	((unsigned int) ((PAGE_SECTORS * (c)->btree_pages) >> (c)->block_bits))
 
 #define bucket_pages(c)		((c)->sb.bucket_size / PAGE_SECTORS)
 #define bucket_bytes(c)		((c)->sb.bucket_size << 9)
@@ -761,21 +762,21 @@ static inline sector_t bucket_remainder(struct cache_set *c, sector_t s)
 
 static inline struct cache *PTR_CACHE(struct cache_set *c,
 				      const struct bkey *k,
-				      unsigned ptr)
+				      unsigned int ptr)
 {
 	return c->cache[PTR_DEV(k, ptr)];
 }
 
 static inline size_t PTR_BUCKET_NR(struct cache_set *c,
 				   const struct bkey *k,
-				   unsigned ptr)
+				   unsigned int ptr)
 {
 	return sector_to_bucket(c, PTR_OFFSET(k, ptr));
 }
 
 static inline struct bucket *PTR_BUCKET(struct cache_set *c,
 					const struct bkey *k,
-					unsigned ptr)
+					unsigned int ptr)
 {
 	return PTR_CACHE(c, k, ptr)->buckets + PTR_BUCKET_NR(c, k, ptr);
 }
@@ -783,17 +784,18 @@ static inline struct bucket *PTR_BUCKET(struct cache_set *c,
 static inline uint8_t gen_after(uint8_t a, uint8_t b)
 {
 	uint8_t r = a - b;
+
 	return r > 128U ? 0 : r;
 }
 
 static inline uint8_t ptr_stale(struct cache_set *c, const struct bkey *k,
-				unsigned i)
+				unsigned int i)
 {
 	return gen_after(PTR_BUCKET(c, k, i)->gen, PTR_GEN(k, i));
 }
 
 static inline bool ptr_available(struct cache_set *c, const struct bkey *k,
-				 unsigned i)
+				 unsigned int i)
 {
 	return (PTR_DEV(k, i) < MAX_CACHES_PER_SET) && PTR_CACHE(c, k, i);
 }
@@ -879,16 +881,16 @@ static inline uint8_t bucket_gc_gen(struct bucket *b)
 #define BUCKET_GC_GEN_MAX	96U
 
 #define kobj_attribute_write(n, fn)					\
-	static struct kobj_attribute ksysfs_##n = __ATTR(n, S_IWUSR, NULL, fn)
+	static struct kobj_attribute ksysfs_##n = __ATTR(n, 0200, NULL, fn)
 
 #define kobj_attribute_rw(n, show, store)				\
 	static struct kobj_attribute ksysfs_##n =			\
-		__ATTR(n, S_IWUSR|S_IRUSR, show, store)
+		__ATTR(n, 0600, show, store)
 
 static inline void wake_up_allocators(struct cache_set *c)
 {
 	struct cache *ca;
-	unsigned i;
+	unsigned int i;
 
 	for_each_cache(ca, c, i)
 		wake_up_process(ca->alloc_thread);
@@ -924,40 +926,43 @@ static inline void wait_for_kthread_stop(void)
 /* Forward declarations */
 
 void bch_count_backing_io_errors(struct cached_dev *dc, struct bio *bio);
-void bch_count_io_errors(struct cache *, blk_status_t, int, const char *);
-void bch_bbio_count_io_errors(struct cache_set *, struct bio *,
-			      blk_status_t, const char *);
-void bch_bbio_endio(struct cache_set *, struct bio *, blk_status_t,
-		const char *);
-void bch_bbio_free(struct bio *, struct cache_set *);
-struct bio *bch_bbio_alloc(struct cache_set *);
-
-void __bch_submit_bbio(struct bio *, struct cache_set *);
-void bch_submit_bbio(struct bio *, struct cache_set *, struct bkey *, unsigned);
-
-uint8_t bch_inc_gen(struct cache *, struct bucket *);
-void bch_rescale_priorities(struct cache_set *, int);
-
-bool bch_can_invalidate_bucket(struct cache *, struct bucket *);
-void __bch_invalidate_one_bucket(struct cache *, struct bucket *);
-
-void __bch_bucket_free(struct cache *, struct bucket *);
-void bch_bucket_free(struct cache_set *, struct bkey *);
-
-long bch_bucket_alloc(struct cache *, unsigned, bool);
-int __bch_bucket_alloc_set(struct cache_set *, unsigned,
-			   struct bkey *, int, bool);
-int bch_bucket_alloc_set(struct cache_set *, unsigned,
-			 struct bkey *, int, bool);
-bool bch_alloc_sectors(struct cache_set *, struct bkey *, unsigned,
-		       unsigned, unsigned, bool);
+void bch_count_io_errors(struct cache *ca, blk_status_t error,
+			 int is_read, const char *m);
+void bch_bbio_count_io_errors(struct cache_set *c, struct bio *bio,
+			      blk_status_t error, const char *m);
+void bch_bbio_endio(struct cache_set *c, struct bio *bio,
+		    blk_status_t error, const char *m);
+void bch_bbio_free(struct bio *bio, struct cache_set *c);
+struct bio *bch_bbio_alloc(struct cache_set *c);
+
+void __bch_submit_bbio(struct bio *bio, struct cache_set *c);
+void bch_submit_bbio(struct bio *bio, struct cache_set *c,
+		     struct bkey *k, unsigned int ptr);
+
+uint8_t bch_inc_gen(struct cache *ca, struct bucket *b);
+void bch_rescale_priorities(struct cache_set *c, int sectors);
+
+bool bch_can_invalidate_bucket(struct cache *ca, struct bucket *b);
+void __bch_invalidate_one_bucket(struct cache *ca, struct bucket *b);
+
+void __bch_bucket_free(struct cache *ca, struct bucket *b);
+void bch_bucket_free(struct cache_set *c, struct bkey *k);
+
+long bch_bucket_alloc(struct cache *ca, unsigned int reserve, bool wait);
+int __bch_bucket_alloc_set(struct cache_set *c, unsigned int reserve,
+			   struct bkey *k, int n, bool wait);
+int bch_bucket_alloc_set(struct cache_set *c, unsigned int reserve,
+			 struct bkey *k, int n, bool wait);
+bool bch_alloc_sectors(struct cache_set *c, struct bkey *k,
+		       unsigned int sectors, unsigned int write_point,
+		       unsigned int write_prio, bool wait);
 bool bch_cached_dev_error(struct cached_dev *dc);
 
 __printf(2, 3)
-bool bch_cache_set_error(struct cache_set *, const char *, ...);
+bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...);
 
-void bch_prio_write(struct cache *);
-void bch_write_bdev_super(struct cached_dev *, struct closure *);
+void bch_prio_write(struct cache *ca);
+void bch_write_bdev_super(struct cached_dev *dc, struct closure *parent);
 
 extern struct workqueue_struct *bcache_wq;
 extern struct mutex bch_register_lock;
@@ -969,30 +974,31 @@ extern struct kobj_type bch_cache_set_ktype;
 extern struct kobj_type bch_cache_set_internal_ktype;
 extern struct kobj_type bch_cache_ktype;
 
-void bch_cached_dev_release(struct kobject *);
-void bch_flash_dev_release(struct kobject *);
-void bch_cache_set_release(struct kobject *);
-void bch_cache_release(struct kobject *);
+void bch_cached_dev_release(struct kobject *kobj);
+void bch_flash_dev_release(struct kobject *kobj);
+void bch_cache_set_release(struct kobject *kobj);
+void bch_cache_release(struct kobject *kobj);
 
-int bch_uuid_write(struct cache_set *);
-void bcache_write_super(struct cache_set *);
+int bch_uuid_write(struct cache_set *c);
+void bcache_write_super(struct cache_set *c);
 
 int bch_flash_dev_create(struct cache_set *c, uint64_t size);
 
-int bch_cached_dev_attach(struct cached_dev *, struct cache_set *, uint8_t *);
-void bch_cached_dev_detach(struct cached_dev *);
-void bch_cached_dev_run(struct cached_dev *);
-void bcache_device_stop(struct bcache_device *);
-
-void bch_cache_set_unregister(struct cache_set *);
-void bch_cache_set_stop(struct cache_set *);
-
-struct cache_set *bch_cache_set_alloc(struct cache_sb *);
-void bch_btree_cache_free(struct cache_set *);
-int bch_btree_cache_alloc(struct cache_set *);
-void bch_moving_init_cache_set(struct cache_set *);
-int bch_open_buckets_alloc(struct cache_set *);
-void bch_open_buckets_free(struct cache_set *);
+int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
+			  uint8_t *set_uuid);
+void bch_cached_dev_detach(struct cached_dev *dc);
+void bch_cached_dev_run(struct cached_dev *dc);
+void bcache_device_stop(struct bcache_device *d);
+
+void bch_cache_set_unregister(struct cache_set *c);
+void bch_cache_set_stop(struct cache_set *c);
+
+struct cache_set *bch_cache_set_alloc(struct cache_sb *sb);
+void bch_btree_cache_free(struct cache_set *c);
+int bch_btree_cache_alloc(struct cache_set *c);
+void bch_moving_init_cache_set(struct cache_set *c);
+int bch_open_buckets_alloc(struct cache_set *c);
+void bch_open_buckets_free(struct cache_set *c);
 
 int bch_cache_allocator_start(struct cache *ca);
 
diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c
index 596c93b44e9b..8f07fa6e1739 100644
--- a/drivers/md/bcache/bset.c
+++ b/drivers/md/bcache/bset.c
@@ -18,31 +18,31 @@
 
 #ifdef CONFIG_BCACHE_DEBUG
 
-void bch_dump_bset(struct btree_keys *b, struct bset *i, unsigned set)
+void bch_dump_bset(struct btree_keys *b, struct bset *i, unsigned int set)
 {
 	struct bkey *k, *next;
 
 	for (k = i->start; k < bset_bkey_last(i); k = next) {
 		next = bkey_next(k);
 
-		printk(KERN_ERR "block %u key %u/%u: ", set,
-		       (unsigned) ((u64 *) k - i->d), i->keys);
+		pr_err("block %u key %u/%u: ", set,
+		       (unsigned int) ((u64 *) k - i->d), i->keys);
 
 		if (b->ops->key_dump)
 			b->ops->key_dump(b, k);
 		else
-			printk("%llu:%llu\n", KEY_INODE(k), KEY_OFFSET(k));
+			pr_err("%llu:%llu\n", KEY_INODE(k), KEY_OFFSET(k));
 
 		if (next < bset_bkey_last(i) &&
 		    bkey_cmp(k, b->ops->is_extents ?
 			     &START_KEY(next) : next) > 0)
-			printk(KERN_ERR "Key skipped backwards\n");
+			pr_err("Key skipped backwards\n");
 	}
 }
 
 void bch_dump_bucket(struct btree_keys *b)
 {
-	unsigned i;
+	unsigned int i;
 
 	console_lock();
 	for (i = 0; i <= b->nsets; i++)
@@ -53,7 +53,7 @@ void bch_dump_bucket(struct btree_keys *b)
 
 int __bch_count_data(struct btree_keys *b)
 {
-	unsigned ret = 0;
+	unsigned int ret = 0;
 	struct btree_iter iter;
 	struct bkey *k;
 
@@ -128,7 +128,7 @@ static inline void bch_btree_iter_next_check(struct btree_iter *iter) {}
 
 /* Keylists */
 
-int __bch_keylist_realloc(struct keylist *l, unsigned u64s)
+int __bch_keylist_realloc(struct keylist *l, unsigned int u64s)
 {
 	size_t oldsize = bch_keylist_nkeys(l);
 	size_t newsize = oldsize + u64s;
@@ -180,7 +180,7 @@ void bch_keylist_pop_front(struct keylist *l)
 /* Key/pointer manipulation */
 
 void bch_bkey_copy_single_ptr(struct bkey *dest, const struct bkey *src,
-			      unsigned i)
+			      unsigned int i)
 {
 	BUG_ON(i > KEY_PTRS(src));
 
@@ -194,7 +194,7 @@ void bch_bkey_copy_single_ptr(struct bkey *dest, const struct bkey *src,
 
 bool __bch_cut_front(const struct bkey *where, struct bkey *k)
 {
-	unsigned i, len = 0;
+	unsigned int i, len = 0;
 
 	if (bkey_cmp(where, &START_KEY(k)) <= 0)
 		return false;
@@ -214,7 +214,7 @@ bool __bch_cut_front(const struct bkey *where, struct bkey *k)
 
 bool __bch_cut_back(const struct bkey *where, struct bkey *k)
 {
-	unsigned len = 0;
+	unsigned int len = 0;
 
 	if (bkey_cmp(where, k) >= 0)
 		return false;
@@ -240,9 +240,9 @@ bool __bch_cut_back(const struct bkey *where, struct bkey *k)
 #define BKEY_MANTISSA_MASK	((1 << BKEY_MANTISSA_BITS) - 1)
 
 struct bkey_float {
-	unsigned	exponent:BKEY_EXPONENT_BITS;
-	unsigned	m:BKEY_MID_BITS;
-	unsigned	mantissa:BKEY_MANTISSA_BITS;
+	unsigned int	exponent:BKEY_EXPONENT_BITS;
+	unsigned int	m:BKEY_MID_BITS;
+	unsigned int	mantissa:BKEY_MANTISSA_BITS;
 } __packed;
 
 /*
@@ -311,7 +311,9 @@ void bch_btree_keys_free(struct btree_keys *b)
 }
 EXPORT_SYMBOL(bch_btree_keys_free);
 
-int bch_btree_keys_alloc(struct btree_keys *b, unsigned page_order, gfp_t gfp)
+int bch_btree_keys_alloc(struct btree_keys *b,
+			 unsigned int page_order,
+			 gfp_t gfp)
 {
 	struct bset_tree *t = b->set;
 
@@ -345,7 +347,7 @@ EXPORT_SYMBOL(bch_btree_keys_alloc);
 void bch_btree_keys_init(struct btree_keys *b, const struct btree_keys_ops *ops,
 			 bool *expensive_debug_checks)
 {
-	unsigned i;
+	unsigned int i;
 
 	b->ops = ops;
 	b->expensive_debug_checks = expensive_debug_checks;
@@ -370,7 +372,7 @@ EXPORT_SYMBOL(bch_btree_keys_init);
  * return array index next to j when does in-order traverse
  * of a binary tree which is stored in a linear array
  */
-static unsigned inorder_next(unsigned j, unsigned size)
+static unsigned int inorder_next(unsigned int j, unsigned int size)
 {
 	if (j * 2 + 1 < size) {
 		j = j * 2 + 1;
@@ -387,7 +389,7 @@ static unsigned inorder_next(unsigned j, unsigned size)
  * return array index previous to j when does in-order traverse
  * of a binary tree which is stored in a linear array
  */
-static unsigned inorder_prev(unsigned j, unsigned size)
+static unsigned int inorder_prev(unsigned int j, unsigned int size)
 {
 	if (j * 2 < size) {
 		j = j * 2;
@@ -400,7 +402,8 @@ static unsigned inorder_prev(unsigned j, unsigned size)
 	return j;
 }
 
-/* I have no idea why this code works... and I'm the one who wrote it
+/*
+ * I have no idea why this code works... and I'm the one who wrote it
  *
  * However, I do know what it does:
  * Given a binary tree constructed in an array (i.e. how you normally implement
@@ -413,10 +416,12 @@ static unsigned inorder_prev(unsigned j, unsigned size)
  * extra is a function of size:
  *   extra = (size - rounddown_pow_of_two(size - 1)) << 1;
  */
-static unsigned __to_inorder(unsigned j, unsigned size, unsigned extra)
+static unsigned int __to_inorder(unsigned int j,
+				  unsigned int size,
+				  unsigned int extra)
 {
-	unsigned b = fls(j);
-	unsigned shift = fls(size - 1) - b;
+	unsigned int b = fls(j);
+	unsigned int shift = fls(size - 1) - b;
 
 	j  ^= 1U << (b - 1);
 	j <<= 1;
@@ -433,14 +438,16 @@ static unsigned __to_inorder(unsigned j, unsigned size, unsigned extra)
  * Return the cacheline index in bset_tree->data, where j is index
  * from a linear array which stores the auxiliar binary tree
  */
-static unsigned to_inorder(unsigned j, struct bset_tree *t)
+static unsigned int to_inorder(unsigned int j, struct bset_tree *t)
 {
 	return __to_inorder(j, t->size, t->extra);
 }
 
-static unsigned __inorder_to_tree(unsigned j, unsigned size, unsigned extra)
+static unsigned int __inorder_to_tree(unsigned int j,
+				      unsigned int size,
+				      unsigned int extra)
 {
-	unsigned shift;
+	unsigned int shift;
 
 	if (j > extra)
 		j += j - extra;
@@ -457,7 +464,7 @@ static unsigned __inorder_to_tree(unsigned j, unsigned size, unsigned extra)
  * Return an index from a linear array which stores the auxiliar binary
  * tree, j is the cacheline index of t->data.
  */
-static unsigned inorder_to_tree(unsigned j, struct bset_tree *t)
+static unsigned int inorder_to_tree(unsigned int j, struct bset_tree *t)
 {
 	return __inorder_to_tree(j, t->size, t->extra);
 }
@@ -468,14 +475,15 @@ void inorder_test(void)
 	unsigned long done = 0;
 	ktime_t start = ktime_get();
 
-	for (unsigned size = 2;
+	for (unsigned int size = 2;
 	     size < 65536000;
 	     size++) {
-		unsigned extra = (size - rounddown_pow_of_two(size - 1)) << 1;
-		unsigned i = 1, j = rounddown_pow_of_two(size - 1);
+		unsigned int extra =
+			(size - rounddown_pow_of_two(size - 1)) << 1;
+		unsigned int i = 1, j = rounddown_pow_of_two(size - 1);
 
 		if (!(size % 4096))
-			printk(KERN_NOTICE "loop %u, %llu per us\n", size,
+			pr_notice("loop %u, %llu per us\n", size,
 			       done / ktime_us_delta(ktime_get(), start));
 
 		while (1) {
@@ -518,30 +526,31 @@ void inorder_test(void)
  * of the previous key so we can walk backwards to it from t->tree[j]'s key.
  */
 
-static struct bkey *cacheline_to_bkey(struct bset_tree *t, unsigned cacheline,
-				      unsigned offset)
+static struct bkey *cacheline_to_bkey(struct bset_tree *t,
+				      unsigned int cacheline,
+				      unsigned int offset)
 {
 	return ((void *) t->data) + cacheline * BSET_CACHELINE + offset * 8;
 }
 
-static unsigned bkey_to_cacheline(struct bset_tree *t, struct bkey *k)
+static unsigned int bkey_to_cacheline(struct bset_tree *t, struct bkey *k)
 {
 	return ((void *) k - (void *) t->data) / BSET_CACHELINE;
 }
 
-static unsigned bkey_to_cacheline_offset(struct bset_tree *t,
-					 unsigned cacheline,
+static unsigned int bkey_to_cacheline_offset(struct bset_tree *t,
+					 unsigned int cacheline,
 					 struct bkey *k)
 {
 	return (u64 *) k - (u64 *) cacheline_to_bkey(t, cacheline, 0);
 }
 
-static struct bkey *tree_to_bkey(struct bset_tree *t, unsigned j)
+static struct bkey *tree_to_bkey(struct bset_tree *t, unsigned int j)
 {
 	return cacheline_to_bkey(t, to_inorder(j, t), t->tree[j].m);
 }
 
-static struct bkey *tree_to_prev_bkey(struct bset_tree *t, unsigned j)
+static struct bkey *tree_to_prev_bkey(struct bset_tree *t, unsigned int j)
 {
 	return (void *) (((uint64_t *) tree_to_bkey(t, j)) - t->prev[j]);
 }
@@ -550,7 +559,7 @@ static struct bkey *tree_to_prev_bkey(struct bset_tree *t, unsigned j)
  * For the write set - the one we're currently inserting keys into - we don't
  * maintain a full search tree, we just keep a simple lookup table in t->prev.
  */
-static struct bkey *table_to_bkey(struct bset_tree *t, unsigned cacheline)
+static struct bkey *table_to_bkey(struct bset_tree *t, unsigned int cacheline)
 {
 	return cacheline_to_bkey(t, cacheline, t->prev[cacheline]);
 }
@@ -576,14 +585,15 @@ static inline uint64_t shrd128(uint64_t high, uint64_t low, uint8_t shift)
  * See make_bfloat() to check when most significant bit of f->exponent
  * is set or not.
  */
-static inline unsigned bfloat_mantissa(const struct bkey *k,
+static inline unsigned int bfloat_mantissa(const struct bkey *k,
 				       struct bkey_float *f)
 {
 	const uint64_t *p = &k->low - (f->exponent >> 6);
+
 	return shrd128(p[-1], p[0], f->exponent & 63) & BKEY_MANTISSA_MASK;
 }
 
-static void make_bfloat(struct bset_tree *t, unsigned j)
+static void make_bfloat(struct bset_tree *t, unsigned int j)
 {
 	struct bkey_float *f = &t->tree[j];
 	struct bkey *m = tree_to_bkey(t, j);
@@ -631,7 +641,7 @@ static void make_bfloat(struct bset_tree *t, unsigned j)
 static void bset_alloc_tree(struct btree_keys *b, struct bset_tree *t)
 {
 	if (t != b->set) {
-		unsigned j = roundup(t[-1].size,
+		unsigned int j = roundup(t[-1].size,
 				     64 / sizeof(struct bkey_float));
 
 		t->tree = t[-1].tree + j;
@@ -686,13 +696,13 @@ void bch_bset_build_written_tree(struct btree_keys *b)
 {
 	struct bset_tree *t = bset_tree_last(b);
 	struct bkey *prev = NULL, *k = t->data->start;
-	unsigned j, cacheline = 1;
+	unsigned int j, cacheline = 1;
 
 	b->last_set_unwritten = 0;
 
 	bset_alloc_tree(b, t);
 
-	t->size = min_t(unsigned,
+	t->size = min_t(unsigned int,
 			bkey_to_cacheline(t, bset_bkey_last(t->data)),
 			b->set->tree + btree_keys_cachelines(b) - t->tree);
 
@@ -732,7 +742,7 @@ EXPORT_SYMBOL(bch_bset_build_written_tree);
 void bch_bset_fix_invalidated_key(struct btree_keys *b, struct bkey *k)
 {
 	struct bset_tree *t;
-	unsigned inorder, j = 1;
+	unsigned int inorder, j = 1;
 
 	for (t = b->set; t <= bset_tree_last(b); t++)
 		if (k < bset_bkey_last(t->data))
@@ -779,14 +789,15 @@ static void bch_bset_fix_lookup_table(struct btree_keys *b,
 				      struct bset_tree *t,
 				      struct bkey *k)
 {
-	unsigned shift = bkey_u64s(k);
-	unsigned j = bkey_to_cacheline(t, k);
+	unsigned int shift = bkey_u64s(k);
+	unsigned int j = bkey_to_cacheline(t, k);
 
 	/* We're getting called from btree_split() or btree_gc, just bail out */
 	if (!t->size)
 		return;
 
-	/* k is the key we just inserted; we need to find the entry in the
+	/*
+	 * k is the key we just inserted; we need to find the entry in the
 	 * lookup table for the first key that is strictly greater than k:
 	 * it's either k's cacheline or the next one
 	 */
@@ -794,7 +805,8 @@ static void bch_bset_fix_lookup_table(struct btree_keys *b,
 	       table_to_bkey(t, j) <= k)
 		j++;
 
-	/* Adjust all the lookup table entries, and find a new key for any that
+	/*
+	 * Adjust all the lookup table entries, and find a new key for any that
 	 * have gotten too big
 	 */
 	for (; j < t->size; j++) {
@@ -819,7 +831,8 @@ static void bch_bset_fix_lookup_table(struct btree_keys *b,
 	     k != bset_bkey_last(t->data);
 	     k = bkey_next(k))
 		if (t->size == bkey_to_cacheline(t, k)) {
-			t->prev[t->size] = bkey_to_cacheline_offset(t, t->size, k);
+			t->prev[t->size] =
+				bkey_to_cacheline_offset(t, t->size, k);
 			t->size++;
 		}
 }
@@ -867,10 +880,10 @@ void bch_bset_insert(struct btree_keys *b, struct bkey *where,
 }
 EXPORT_SYMBOL(bch_bset_insert);
 
-unsigned bch_btree_insert_key(struct btree_keys *b, struct bkey *k,
+unsigned int bch_btree_insert_key(struct btree_keys *b, struct bkey *k,
 			      struct bkey *replace_key)
 {
-	unsigned status = BTREE_INSERT_STATUS_NO_INSERT;
+	unsigned int status = BTREE_INSERT_STATUS_NO_INSERT;
 	struct bset *i = bset_tree_last(b)->data;
 	struct bkey *m, *prev = NULL;
 	struct btree_iter iter;
@@ -922,10 +935,10 @@ struct bset_search_iter {
 static struct bset_search_iter bset_search_write_set(struct bset_tree *t,
 						     const struct bkey *search)
 {
-	unsigned li = 0, ri = t->size;
+	unsigned int li = 0, ri = t->size;
 
 	while (li + 1 != ri) {
-		unsigned m = (li + ri) >> 1;
+		unsigned int m = (li + ri) >> 1;
 
 		if (bkey_cmp(table_to_bkey(t, m), search) > 0)
 			ri = m;
@@ -944,7 +957,7 @@ static struct bset_search_iter bset_search_tree(struct bset_tree *t,
 {
 	struct bkey *l, *r;
 	struct bkey_float *f;
-	unsigned inorder, j, n = 1;
+	unsigned int inorder, j, n = 1;
 
 	do {
 		/*
@@ -958,7 +971,8 @@ static struct bset_search_iter bset_search_tree(struct bset_tree *t,
 		 *		p = 0;
 		 * but a branch instruction is avoided.
 		 */
-		unsigned p = n << 4;
+		unsigned int p = n << 4;
+
 		p &= ((int) (p - t->size)) >> 31;
 
 		prefetch(&t->tree[p]);
@@ -978,7 +992,7 @@ static struct bset_search_iter bset_search_tree(struct bset_tree *t,
 		 * to work  - that's done in make_bfloat()
 		 */
 		if (likely(f->exponent != 127))
-			n = j * 2 + (((unsigned)
+			n = j * 2 + (((unsigned int)
 				      (f->mantissa -
 				       bfloat_mantissa(search, f))) >> 31);
 		else
@@ -1109,6 +1123,7 @@ static struct bkey *__bch_btree_iter_init(struct btree_keys *b,
 					  struct bset_tree *start)
 {
 	struct bkey *ret = NULL;
+
 	iter->size = ARRAY_SIZE(iter->data);
 	iter->used = 0;
 
@@ -1184,7 +1199,8 @@ void bch_bset_sort_state_free(struct bset_sort_state *state)
 	mempool_exit(&state->pool);
 }
 
-int bch_bset_sort_state_init(struct bset_sort_state *state, unsigned page_order)
+int bch_bset_sort_state_init(struct bset_sort_state *state,
+			     unsigned int page_order)
 {
 	spin_lock_init(&state->time.lock);
 
@@ -1237,7 +1253,7 @@ static void btree_mergesort(struct btree_keys *b, struct bset *out,
 }
 
 static void __btree_sort(struct btree_keys *b, struct btree_iter *iter,
-			 unsigned start, unsigned order, bool fixup,
+			 unsigned int start, unsigned int order, bool fixup,
 			 struct bset_sort_state *state)
 {
 	uint64_t start_time;
@@ -1288,7 +1304,7 @@ static void __btree_sort(struct btree_keys *b, struct btree_iter *iter,
 		bch_time_stats_update(&state->time, start_time);
 }
 
-void bch_btree_sort_partial(struct btree_keys *b, unsigned start,
+void bch_btree_sort_partial(struct btree_keys *b, unsigned int start,
 			    struct bset_sort_state *state)
 {
 	size_t order = b->page_order, keys = 0;
@@ -1298,7 +1314,7 @@ void bch_btree_sort_partial(struct btree_keys *b, unsigned start,
 	__bch_btree_iter_init(b, &iter, NULL, &b->set[start]);
 
 	if (start) {
-		unsigned i;
+		unsigned int i;
 
 		for (i = start; i <= b->nsets; i++)
 			keys += b->set[i].data->keys;
@@ -1323,8 +1339,8 @@ void bch_btree_sort_into(struct btree_keys *b, struct btree_keys *new,
 			 struct bset_sort_state *state)
 {
 	uint64_t start_time = local_clock();
-
 	struct btree_iter iter;
+
 	bch_btree_iter_init(b, &iter, NULL);
 
 	btree_mergesort(b, new->set->data, &iter, false, true);
@@ -1338,7 +1354,7 @@ void bch_btree_sort_into(struct btree_keys *b, struct btree_keys *new,
 
 void bch_btree_sort_lazy(struct btree_keys *b, struct bset_sort_state *state)
 {
-	unsigned crit = SORT_CRIT;
+	unsigned int crit = SORT_CRIT;
 	int i;
 
 	/* Don't sort if nothing to do */
@@ -1367,7 +1383,7 @@ EXPORT_SYMBOL(bch_btree_sort_lazy);
 
 void bch_btree_keys_stats(struct btree_keys *b, struct bset_stats *stats)
 {
-	unsigned i;
+	unsigned int i;
 
 	for (i = 0; i <= b->nsets; i++) {
 		struct bset_tree *t = &b->set[i];
diff --git a/drivers/md/bcache/bset.h b/drivers/md/bcache/bset.h
index b867f2200495..bac76aabca6d 100644
--- a/drivers/md/bcache/bset.h
+++ b/drivers/md/bcache/bset.h
@@ -163,10 +163,10 @@ struct bset_tree {
 	 */
 
 	/* size of the binary tree and prev array */
-	unsigned		size;
+	unsigned int		size;
 
 	/* function of size - precalculated for to_inorder() */
-	unsigned		extra;
+	unsigned int		extra;
 
 	/* copy of the last key in the set */
 	struct bkey		end;
@@ -187,18 +187,25 @@ struct bset_tree {
 };
 
 struct btree_keys_ops {
-	bool		(*sort_cmp)(struct btree_iter_set,
-				    struct btree_iter_set);
-	struct bkey	*(*sort_fixup)(struct btree_iter *, struct bkey *);
-	bool		(*insert_fixup)(struct btree_keys *, struct bkey *,
-					struct btree_iter *, struct bkey *);
-	bool		(*key_invalid)(struct btree_keys *,
-				       const struct bkey *);
-	bool		(*key_bad)(struct btree_keys *, const struct bkey *);
-	bool		(*key_merge)(struct btree_keys *,
-				     struct bkey *, struct bkey *);
-	void		(*key_to_text)(char *, size_t, const struct bkey *);
-	void		(*key_dump)(struct btree_keys *, const struct bkey *);
+	bool		(*sort_cmp)(struct btree_iter_set l,
+				    struct btree_iter_set r);
+	struct bkey	*(*sort_fixup)(struct btree_iter *iter,
+				       struct bkey *tmp);
+	bool		(*insert_fixup)(struct btree_keys *b,
+					struct bkey *insert,
+					struct btree_iter *iter,
+					struct bkey *replace_key);
+	bool		(*key_invalid)(struct btree_keys *bk,
+				       const struct bkey *k);
+	bool		(*key_bad)(struct btree_keys *bk,
+				   const struct bkey *k);
+	bool		(*key_merge)(struct btree_keys *bk,
+				     struct bkey *l, struct bkey *r);
+	void		(*key_to_text)(char *buf,
+				       size_t size,
+				       const struct bkey *k);
+	void		(*key_dump)(struct btree_keys *keys,
+				    const struct bkey *k);
 
 	/*
 	 * Only used for deciding whether to use START_KEY(k) or just the key
@@ -211,7 +218,7 @@ struct btree_keys {
 	const struct btree_keys_ops	*ops;
 	uint8_t			page_order;
 	uint8_t			nsets;
-	unsigned		last_set_unwritten:1;
+	unsigned int		last_set_unwritten:1;
 	bool			*expensive_debug_checks;
 
 	/*
@@ -239,12 +246,14 @@ static inline bool bkey_written(struct btree_keys *b, struct bkey *k)
 	return !b->last_set_unwritten || k < b->set[b->nsets].data->start;
 }
 
-static inline unsigned bset_byte_offset(struct btree_keys *b, struct bset *i)
+static inline unsigned int bset_byte_offset(struct btree_keys *b,
+					    struct bset *i)
 {
 	return ((size_t) i) - ((size_t) b->set->data);
 }
 
-static inline unsigned bset_sector_offset(struct btree_keys *b, struct bset *i)
+static inline unsigned int bset_sector_offset(struct btree_keys *b,
+					      struct bset *i)
 {
 	return bset_byte_offset(b, i) >> 9;
 }
@@ -273,25 +282,27 @@ static inline size_t bch_btree_keys_u64s_remaining(struct btree_keys *b)
 }
 
 static inline struct bset *bset_next_set(struct btree_keys *b,
-					 unsigned block_bytes)
+					 unsigned int block_bytes)
 {
 	struct bset *i = bset_tree_last(b)->data;
 
 	return ((void *) i) + roundup(set_bytes(i), block_bytes);
 }
 
-void bch_btree_keys_free(struct btree_keys *);
-int bch_btree_keys_alloc(struct btree_keys *, unsigned, gfp_t);
-void bch_btree_keys_init(struct btree_keys *, const struct btree_keys_ops *,
-			 bool *);
-
-void bch_bset_init_next(struct btree_keys *, struct bset *, uint64_t);
-void bch_bset_build_written_tree(struct btree_keys *);
-void bch_bset_fix_invalidated_key(struct btree_keys *, struct bkey *);
-bool bch_bkey_try_merge(struct btree_keys *, struct bkey *, struct bkey *);
-void bch_bset_insert(struct btree_keys *, struct bkey *, struct bkey *);
-unsigned bch_btree_insert_key(struct btree_keys *, struct bkey *,
-			      struct bkey *);
+void bch_btree_keys_free(struct btree_keys *b);
+int bch_btree_keys_alloc(struct btree_keys *b, unsigned int page_order,
+			 gfp_t gfp);
+void bch_btree_keys_init(struct btree_keys *b, const struct btree_keys_ops *ops,
+			 bool *expensive_debug_checks);
+
+void bch_bset_init_next(struct btree_keys *b, struct bset *i, uint64_t magic);
+void bch_bset_build_written_tree(struct btree_keys *b);
+void bch_bset_fix_invalidated_key(struct btree_keys *b, struct bkey *k);
+bool bch_bkey_try_merge(struct btree_keys *b, struct bkey *l, struct bkey *r);
+void bch_bset_insert(struct btree_keys *b, struct bkey *where,
+		     struct bkey *insert);
+unsigned int bch_btree_insert_key(struct btree_keys *b, struct bkey *k,
+			      struct bkey *replace_key);
 
 enum {
 	BTREE_INSERT_STATUS_NO_INSERT = 0,
@@ -313,18 +324,21 @@ struct btree_iter {
 	} data[MAX_BSETS];
 };
 
-typedef bool (*ptr_filter_fn)(struct btree_keys *, const struct bkey *);
+typedef bool (*ptr_filter_fn)(struct btree_keys *b, const struct bkey *k);
 
-struct bkey *bch_btree_iter_next(struct btree_iter *);
-struct bkey *bch_btree_iter_next_filter(struct btree_iter *,
-					struct btree_keys *, ptr_filter_fn);
+struct bkey *bch_btree_iter_next(struct btree_iter *iter);
+struct bkey *bch_btree_iter_next_filter(struct btree_iter *iter,
+					struct btree_keys *b,
+					ptr_filter_fn fn);
 
-void bch_btree_iter_push(struct btree_iter *, struct bkey *, struct bkey *);
-struct bkey *bch_btree_iter_init(struct btree_keys *, struct btree_iter *,
-				 struct bkey *);
+void bch_btree_iter_push(struct btree_iter *iter, struct bkey *k,
+			 struct bkey *end);
+struct bkey *bch_btree_iter_init(struct btree_keys *b,
+				 struct btree_iter *iter,
+				 struct bkey *search);
 
-struct bkey *__bch_bset_search(struct btree_keys *, struct bset_tree *,
-			       const struct bkey *);
+struct bkey *__bch_bset_search(struct btree_keys *b, struct bset_tree *t,
+			       const struct bkey *search);
 
 /*
  * Returns the first key that is strictly greater than search
@@ -349,21 +363,23 @@ static inline struct bkey *bch_bset_search(struct btree_keys *b,
 struct bset_sort_state {
 	mempool_t		pool;
 
-	unsigned		page_order;
-	unsigned		crit_factor;
+	unsigned int		page_order;
+	unsigned int		crit_factor;
 
 	struct time_stats	time;
 };
 
-void bch_bset_sort_state_free(struct bset_sort_state *);
-int bch_bset_sort_state_init(struct bset_sort_state *, unsigned);
-void bch_btree_sort_lazy(struct btree_keys *, struct bset_sort_state *);
-void bch_btree_sort_into(struct btree_keys *, struct btree_keys *,
-			 struct bset_sort_state *);
-void bch_btree_sort_and_fix_extents(struct btree_keys *, struct btree_iter *,
-				    struct bset_sort_state *);
-void bch_btree_sort_partial(struct btree_keys *, unsigned,
-			    struct bset_sort_state *);
+void bch_bset_sort_state_free(struct bset_sort_state *state);
+int bch_bset_sort_state_init(struct bset_sort_state *state,
+			     unsigned int page_order);
+void bch_btree_sort_lazy(struct btree_keys *b, struct bset_sort_state *state);
+void bch_btree_sort_into(struct btree_keys *b, struct btree_keys *new,
+			 struct bset_sort_state *state);
+void bch_btree_sort_and_fix_extents(struct btree_keys *b,
+				    struct btree_iter *iter,
+				    struct bset_sort_state *state);
+void bch_btree_sort_partial(struct btree_keys *b, unsigned int start,
+			    struct bset_sort_state *state);
 
 static inline void bch_btree_sort(struct btree_keys *b,
 				  struct bset_sort_state *state)
@@ -377,13 +393,13 @@ struct bset_stats {
 	size_t floats, failed;
 };
 
-void bch_btree_keys_stats(struct btree_keys *, struct bset_stats *);
+void bch_btree_keys_stats(struct btree_keys *b, struct bset_stats *state);
 
 /* Bkey utility code */
 
 #define bset_bkey_last(i)	bkey_idx((struct bkey *) (i)->d, (i)->keys)
 
-static inline struct bkey *bset_bkey_idx(struct bset *i, unsigned idx)
+static inline struct bkey *bset_bkey_idx(struct bset *i, unsigned int idx)
 {
 	return bkey_idx(i->start, idx);
 }
@@ -401,10 +417,10 @@ static __always_inline int64_t bkey_cmp(const struct bkey *l,
 		: (int64_t) KEY_OFFSET(l) - (int64_t) KEY_OFFSET(r);
 }
 
-void bch_bkey_copy_single_ptr(struct bkey *, const struct bkey *,
-			      unsigned);
-bool __bch_cut_front(const struct bkey *, struct bkey *);
-bool __bch_cut_back(const struct bkey *, struct bkey *);
+void bch_bkey_copy_single_ptr(struct bkey *dest, const struct bkey *src,
+			      unsigned int i);
+bool __bch_cut_front(const struct bkey *where, struct bkey *k);
+bool __bch_cut_back(const struct bkey *where, struct bkey *k);
 
 static inline bool bch_cut_front(const struct bkey *where, struct bkey *k)
 {
@@ -522,18 +538,20 @@ static inline size_t bch_keylist_bytes(struct keylist *l)
 	return bch_keylist_nkeys(l) * sizeof(uint64_t);
 }
 
-struct bkey *bch_keylist_pop(struct keylist *);
-void bch_keylist_pop_front(struct keylist *);
-int __bch_keylist_realloc(struct keylist *, unsigned);
+struct bkey *bch_keylist_pop(struct keylist *l);
+void bch_keylist_pop_front(struct keylist *l);
+int __bch_keylist_realloc(struct keylist *l, unsigned int u64s);
 
 /* Debug stuff */
 
 #ifdef CONFIG_BCACHE_DEBUG
 
-int __bch_count_data(struct btree_keys *);
-void __printf(2, 3) __bch_check_keys(struct btree_keys *, const char *, ...);
-void bch_dump_bset(struct btree_keys *, struct bset *, unsigned);
-void bch_dump_bucket(struct btree_keys *);
+int __bch_count_data(struct btree_keys *b);
+void __printf(2, 3) __bch_check_keys(struct btree_keys *b,
+				     const char *fmt,
+				     ...);
+void bch_dump_bset(struct btree_keys *b, struct bset *i, unsigned int set);
+void bch_dump_bucket(struct btree_keys *b);
 
 #else
 
@@ -541,7 +559,7 @@ static inline int __bch_count_data(struct btree_keys *b) { return -1; }
 static inline void __printf(2, 3)
 	__bch_check_keys(struct btree_keys *b, const char *fmt, ...) {}
 static inline void bch_dump_bucket(struct btree_keys *b) {}
-void bch_dump_bset(struct btree_keys *, struct bset *, unsigned);
+void bch_dump_bset(struct btree_keys *b, struct bset *i, unsigned int set);
 
 #endif
 
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index c19f7716df88..e7d4817681f2 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -183,7 +183,7 @@ static void bch_btree_init_next(struct btree *b)
 
 void bkey_put(struct cache_set *c, struct bkey *k)
 {
-	unsigned i;
+	unsigned int i;
 
 	for (i = 0; i < KEY_PTRS(k); i++)
 		if (ptr_available(c, k, i))
@@ -287,6 +287,7 @@ err:
 static void btree_node_read_endio(struct bio *bio)
 {
 	struct closure *cl = bio->bi_private;
+
 	closure_put(cl);
 }
 
@@ -435,7 +436,10 @@ static void do_btree_node_write(struct btree *b)
 
 		continue_at(cl, btree_node_write_done, NULL);
 	} else {
-		/* No problem for multipage bvec since the bio is just allocated */
+		/*
+		 * No problem for multipage bvec since the bio is
+		 * just allocated
+		 */
 		b->bio->bi_vcnt = 0;
 		bch_bio_map(b->bio, i);
 
@@ -479,7 +483,7 @@ void __bch_btree_node_write(struct btree *b, struct closure *parent)
 
 void bch_btree_node_write(struct btree *b, struct closure *parent)
 {
-	unsigned nsets = b->keys.nsets;
+	unsigned int nsets = b->keys.nsets;
 
 	lockdep_assert_held(&b->lock);
 
@@ -581,7 +585,7 @@ static void mca_bucket_free(struct btree *b)
 	list_move(&b->list, &b->c->btree_cache_freeable);
 }
 
-static unsigned btree_order(struct bkey *k)
+static unsigned int btree_order(struct bkey *k)
 {
 	return ilog2(KEY_SIZE(k) / PAGE_SECTORS ?: 1);
 }
@@ -589,7 +593,7 @@ static unsigned btree_order(struct bkey *k)
 static void mca_data_alloc(struct btree *b, struct bkey *k, gfp_t gfp)
 {
 	if (!bch_btree_keys_alloc(&b->keys,
-				  max_t(unsigned,
+				  max_t(unsigned int,
 					ilog2(b->c->btree_pages),
 					btree_order(k)),
 				  gfp)) {
@@ -604,6 +608,7 @@ static struct btree *mca_bucket_alloc(struct cache_set *c,
 				      struct bkey *k, gfp_t gfp)
 {
 	struct btree *b = kzalloc(sizeof(struct btree), gfp);
+
 	if (!b)
 		return NULL;
 
@@ -620,7 +625,7 @@ static struct btree *mca_bucket_alloc(struct cache_set *c,
 	return b;
 }
 
-static int mca_reap(struct btree *b, unsigned min_order, bool flush)
+static int mca_reap(struct btree *b, unsigned int min_order, bool flush)
 {
 	struct closure cl;
 
@@ -746,6 +751,7 @@ void bch_btree_cache_free(struct cache_set *c)
 {
 	struct btree *b;
 	struct closure cl;
+
 	closure_init_stack(&cl);
 
 	if (c->shrink.list.next)
@@ -786,7 +792,7 @@ void bch_btree_cache_free(struct cache_set *c)
 
 int bch_btree_cache_alloc(struct cache_set *c)
 {
-	unsigned i;
+	unsigned int i;
 
 	for (i = 0; i < mca_reserve(c); i++)
 		if (!mca_bucket_alloc(c, &ZERO_KEY, GFP_KERNEL))
@@ -1124,6 +1130,7 @@ static struct btree *btree_node_alloc_replacement(struct btree *b,
 						  struct btree_op *op)
 {
 	struct btree *n = bch_btree_node_alloc(b->c, op, b->level, b->parent);
+
 	if (!IS_ERR_OR_NULL(n)) {
 		mutex_lock(&n->write_lock);
 		bch_btree_sort_into(&b->keys, &n->keys, &b->c->sort);
@@ -1136,7 +1143,7 @@ static struct btree *btree_node_alloc_replacement(struct btree *b,
 
 static void make_btree_freeing_key(struct btree *b, struct bkey *k)
 {
-	unsigned i;
+	unsigned int i;
 
 	mutex_lock(&b->c->bucket_lock);
 
@@ -1157,7 +1164,7 @@ static int btree_check_reserve(struct btree *b, struct btree_op *op)
 {
 	struct cache_set *c = b->c;
 	struct cache *ca;
-	unsigned i, reserve = (c->root->level - b->level) * 2 + 1;
+	unsigned int i, reserve = (c->root->level - b->level) * 2 + 1;
 
 	mutex_lock(&c->bucket_lock);
 
@@ -1181,7 +1188,7 @@ static uint8_t __bch_btree_mark_key(struct cache_set *c, int level,
 				    struct bkey *k)
 {
 	uint8_t stale = 0;
-	unsigned i;
+	unsigned int i;
 	struct bucket *g;
 
 	/*
@@ -1219,7 +1226,7 @@ static uint8_t __bch_btree_mark_key(struct cache_set *c, int level,
 			SET_GC_MARK(g, GC_MARK_RECLAIMABLE);
 
 		/* guard against overflow */
-		SET_GC_SECTORS_USED(g, min_t(unsigned,
+		SET_GC_SECTORS_USED(g, min_t(unsigned int,
 					     GC_SECTORS_USED(g) + KEY_SIZE(k),
 					     MAX_GC_SECTORS_USED));
 
@@ -1233,7 +1240,7 @@ static uint8_t __bch_btree_mark_key(struct cache_set *c, int level,
 
 void bch_initial_mark_key(struct cache_set *c, int level, struct bkey *k)
 {
-	unsigned i;
+	unsigned int i;
 
 	for (i = 0; i < KEY_PTRS(k); i++)
 		if (ptr_available(c, k, i) &&
@@ -1259,7 +1266,7 @@ void bch_update_bucket_in_use(struct cache_set *c, struct gc_stat *stats)
 static bool btree_gc_mark_node(struct btree *b, struct gc_stat *gc)
 {
 	uint8_t stale = 0;
-	unsigned keys = 0, good_keys = 0;
+	unsigned int keys = 0, good_keys = 0;
 	struct bkey *k;
 	struct btree_iter iter;
 	struct bset_tree *t;
@@ -1302,16 +1309,18 @@ static bool btree_gc_mark_node(struct btree *b, struct gc_stat *gc)
 
 struct gc_merge_info {
 	struct btree	*b;
-	unsigned	keys;
+	unsigned int	keys;
 };
 
-static int bch_btree_insert_node(struct btree *, struct btree_op *,
-				 struct keylist *, atomic_t *, struct bkey *);
+static int bch_btree_insert_node(struct btree *b, struct btree_op *op,
+				 struct keylist *insert_keys,
+				 atomic_t *journal_ref,
+				 struct bkey *replace_key);
 
 static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
 			     struct gc_stat *gc, struct gc_merge_info *r)
 {
-	unsigned i, nodes = 0, keys = 0, blocks;
+	unsigned int i, nodes = 0, keys = 0, blocks;
 	struct btree *new_nodes[GC_MERGE_NODES];
 	struct keylist keylist;
 	struct closure cl;
@@ -1511,11 +1520,11 @@ static int btree_gc_rewrite_node(struct btree *b, struct btree_op *op,
 	return -EINTR;
 }
 
-static unsigned btree_gc_count_keys(struct btree *b)
+static unsigned int btree_gc_count_keys(struct btree *b)
 {
 	struct bkey *k;
 	struct btree_iter iter;
-	unsigned ret = 0;
+	unsigned int ret = 0;
 
 	for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad)
 		ret += bkey_u64s(k);
@@ -1678,7 +1687,7 @@ static void btree_gc_start(struct cache_set *c)
 {
 	struct cache *ca;
 	struct bucket *b;
-	unsigned i;
+	unsigned int i;
 
 	if (!c->gc_mark_valid)
 		return;
@@ -1704,7 +1713,7 @@ static void bch_btree_gc_finish(struct cache_set *c)
 {
 	struct bucket *b;
 	struct cache *ca;
-	unsigned i;
+	unsigned int i;
 
 	mutex_lock(&c->bucket_lock);
 
@@ -1722,7 +1731,7 @@ static void bch_btree_gc_finish(struct cache_set *c)
 		struct bcache_device *d = c->devices[i];
 		struct cached_dev *dc;
 		struct keybuf_key *w, *n;
-		unsigned j;
+		unsigned int j;
 
 		if (!d || UUID_FLASH_ONLY(&c->uuids[i]))
 			continue;
@@ -1814,7 +1823,7 @@ static void bch_btree_gc(struct cache_set *c)
 static bool gc_should_run(struct cache_set *c)
 {
 	struct cache *ca;
-	unsigned i;
+	unsigned int i;
 
 	for_each_cache(ca, c, i)
 		if (ca->invalidate_needs_gc)
@@ -1905,7 +1914,7 @@ void bch_initial_gc_finish(struct cache_set *c)
 {
 	struct cache *ca;
 	struct bucket *b;
-	unsigned i;
+	unsigned int i;
 
 	bch_btree_gc_finish(c);
 
@@ -1945,7 +1954,7 @@ void bch_initial_gc_finish(struct cache_set *c)
 static bool btree_insert_key(struct btree *b, struct bkey *k,
 			     struct bkey *replace_key)
 {
-	unsigned status;
+	unsigned int status;
 
 	BUG_ON(bkey_cmp(k, &b->key) > 0);
 
@@ -2044,7 +2053,7 @@ static int btree_split(struct btree *b, struct btree_op *op,
 			   block_bytes(n1->c)) > (btree_blocks(b) * 4) / 5;
 
 	if (split) {
-		unsigned keys = 0;
+		unsigned int keys = 0;
 
 		trace_bcache_btree_node_split(b, btree_bset_first(n1)->keys);
 
@@ -2222,10 +2231,10 @@ int bch_btree_insert_check_key(struct btree *b, struct btree_op *op,
 		rw_lock(true, b, b->level);
 
 		if (b->key.ptr[0] != btree_ptr ||
-                   b->seq != seq + 1) {
+		    b->seq != seq + 1) {
 			op->lock = b->level;
 			goto out;
-               }
+		}
 	}
 
 	SET_KEY_PTRS(check_key, 1);
@@ -2300,7 +2309,7 @@ int bch_btree_insert(struct cache_set *c, struct keylist *keys,
 
 void bch_btree_set_root(struct btree *b)
 {
-	unsigned i;
+	unsigned int i;
 	struct closure cl;
 
 	closure_init_stack(&cl);
@@ -2412,7 +2421,7 @@ static inline int keybuf_nonoverlapping_cmp(struct keybuf_key *l,
 
 struct refill {
 	struct btree_op	op;
-	unsigned	nr_found;
+	unsigned int	nr_found;
 	struct keybuf	*buf;
 	struct bkey	*end;
 	keybuf_pred_fn	*pred;
@@ -2488,6 +2497,7 @@ void bch_refill_keybuf(struct cache_set *c, struct keybuf *buf,
 
 	if (!RB_EMPTY_ROOT(&buf->keys)) {
 		struct keybuf_key *w;
+
 		w = RB_FIRST(&buf->keys, struct keybuf_key, node);
 		buf->start	= START_KEY(&w->key);
 
@@ -2519,6 +2529,7 @@ bool bch_keybuf_check_overlapping(struct keybuf *buf, struct bkey *start,
 {
 	bool ret = false;
 	struct keybuf_key *p, *w, s;
+
 	s.key = *start;
 
 	if (bkey_cmp(end, &buf->start) <= 0 ||
@@ -2545,6 +2556,7 @@ bool bch_keybuf_check_overlapping(struct keybuf *buf, struct bkey *start,
 struct keybuf_key *bch_keybuf_next(struct keybuf *buf)
 {
 	struct keybuf_key *w;
+
 	spin_lock(&buf->lock);
 
 	w = RB_FIRST(&buf->keys, struct keybuf_key, node);
diff --git a/drivers/md/bcache/btree.h b/drivers/md/bcache/btree.h
index 68e9d926134d..a68d6c55783b 100644
--- a/drivers/md/bcache/btree.h
+++ b/drivers/md/bcache/btree.h
@@ -184,7 +184,7 @@ static inline struct bset *btree_bset_last(struct btree *b)
 	return bset_tree_last(&b->keys)->data;
 }
 
-static inline unsigned bset_block_offset(struct btree *b, struct bset *i)
+static inline unsigned int bset_block_offset(struct btree *b, struct bset *i)
 {
 	return bset_sector_offset(&b->keys, i) >> b->c->block_bits;
 }
@@ -213,7 +213,7 @@ struct btree_op {
 	/* Btree level at which we start taking write locks */
 	short			lock;
 
-	unsigned		insert_collision:1;
+	unsigned int		insert_collision:1;
 };
 
 static inline void bch_btree_op_init(struct btree_op *op, int write_lock_level)
@@ -238,26 +238,28 @@ static inline void rw_unlock(bool w, struct btree *b)
 	(w ? up_write : up_read)(&b->lock);
 }
 
-void bch_btree_node_read_done(struct btree *);
-void __bch_btree_node_write(struct btree *, struct closure *);
-void bch_btree_node_write(struct btree *, struct closure *);
-
-void bch_btree_set_root(struct btree *);
-struct btree *__bch_btree_node_alloc(struct cache_set *, struct btree_op *,
-				     int, bool, struct btree *);
-struct btree *bch_btree_node_get(struct cache_set *, struct btree_op *,
-				 struct bkey *, int, bool, struct btree *);
-
-int bch_btree_insert_check_key(struct btree *, struct btree_op *,
-			       struct bkey *);
-int bch_btree_insert(struct cache_set *, struct keylist *,
-		     atomic_t *, struct bkey *);
-
-int bch_gc_thread_start(struct cache_set *);
-void bch_initial_gc_finish(struct cache_set *);
-void bch_moving_gc(struct cache_set *);
-int bch_btree_check(struct cache_set *);
-void bch_initial_mark_key(struct cache_set *, int, struct bkey *);
+void bch_btree_node_read_done(struct btree *b);
+void __bch_btree_node_write(struct btree *b, struct closure *parent);
+void bch_btree_node_write(struct btree *b, struct closure *parent);
+
+void bch_btree_set_root(struct btree *b);
+struct btree *__bch_btree_node_alloc(struct cache_set *c, struct btree_op *op,
+				     int level, bool wait,
+				     struct btree *parent);
+struct btree *bch_btree_node_get(struct cache_set *c, struct btree_op *op,
+				 struct bkey *k, int level, bool write,
+				 struct btree *parent);
+
+int bch_btree_insert_check_key(struct btree *b, struct btree_op *op,
+			       struct bkey *check_key);
+int bch_btree_insert(struct cache_set *c, struct keylist *keys,
+		     atomic_t *journal_ref, struct bkey *replace_key);
+
+int bch_gc_thread_start(struct cache_set *c);
+void bch_initial_gc_finish(struct cache_set *c);
+void bch_moving_gc(struct cache_set *c);
+int bch_btree_check(struct cache_set *c);
+void bch_initial_mark_key(struct cache_set *c, int level, struct bkey *k);
 
 static inline void wake_up_gc(struct cache_set *c)
 {
@@ -272,9 +274,9 @@ static inline void wake_up_gc(struct cache_set *c)
 
 #define MAP_END_KEY	1
 
-typedef int (btree_map_nodes_fn)(struct btree_op *, struct btree *);
-int __bch_btree_map_nodes(struct btree_op *, struct cache_set *,
-			  struct bkey *, btree_map_nodes_fn *, int);
+typedef int (btree_map_nodes_fn)(struct btree_op *b_op, struct btree *b);
+int __bch_btree_map_nodes(struct btree_op *op, struct cache_set *c,
+			  struct bkey *from, btree_map_nodes_fn *fn, int flags);
 
 static inline int bch_btree_map_nodes(struct btree_op *op, struct cache_set *c,
 				      struct bkey *from, btree_map_nodes_fn *fn)
@@ -290,21 +292,23 @@ static inline int bch_btree_map_leaf_nodes(struct btree_op *op,
 	return __bch_btree_map_nodes(op, c, from, fn, MAP_LEAF_NODES);
 }
 
-typedef int (btree_map_keys_fn)(struct btree_op *, struct btree *,
-				struct bkey *);
-int bch_btree_map_keys(struct btree_op *, struct cache_set *,
-		       struct bkey *, btree_map_keys_fn *, int);
-
-typedef bool (keybuf_pred_fn)(struct keybuf *, struct bkey *);
-
-void bch_keybuf_init(struct keybuf *);
-void bch_refill_keybuf(struct cache_set *, struct keybuf *,
-		       struct bkey *, keybuf_pred_fn *);
-bool bch_keybuf_check_overlapping(struct keybuf *, struct bkey *,
-				  struct bkey *);
-void bch_keybuf_del(struct keybuf *, struct keybuf_key *);
-struct keybuf_key *bch_keybuf_next(struct keybuf *);
-struct keybuf_key *bch_keybuf_next_rescan(struct cache_set *, struct keybuf *,
-					  struct bkey *, keybuf_pred_fn *);
+typedef int (btree_map_keys_fn)(struct btree_op *op, struct btree *b,
+				struct bkey *k);
+int bch_btree_map_keys(struct btree_op *op, struct cache_set *c,
+		       struct bkey *from, btree_map_keys_fn *fn, int flags);
+
+typedef bool (keybuf_pred_fn)(struct keybuf *buf, struct bkey *k);
+
+void bch_keybuf_init(struct keybuf *buf);
+void bch_refill_keybuf(struct cache_set *c, struct keybuf *buf,
+		       struct bkey *end, keybuf_pred_fn *pred);
+bool bch_keybuf_check_overlapping(struct keybuf *buf, struct bkey *start,
+				  struct bkey *end);
+void bch_keybuf_del(struct keybuf *buf, struct keybuf_key *w);
+struct keybuf_key *bch_keybuf_next(struct keybuf *buf);
+struct keybuf_key *bch_keybuf_next_rescan(struct cache_set *c,
+					  struct keybuf *buf,
+					  struct bkey *end,
+					  keybuf_pred_fn *pred);
 void bch_update_bucket_in_use(struct cache_set *c, struct gc_stat *stats);
 #endif
diff --git a/drivers/md/bcache/closure.c b/drivers/md/bcache/closure.c
index 618253683d40..73f5319295bc 100644
--- a/drivers/md/bcache/closure.c
+++ b/drivers/md/bcache/closure.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Asynchronous refcounty things
  *
@@ -162,12 +163,13 @@ static struct dentry *closure_debug;
 static int debug_seq_show(struct seq_file *f, void *data)
 {
 	struct closure *cl;
+
 	spin_lock_irq(&closure_list_lock);
 
 	list_for_each_entry(cl, &closure_list, all) {
 		int r = atomic_read(&cl->remaining);
 
-		seq_printf(f, "%p: %pF -> %pf p %p r %i ",
+		seq_printf(f, "%p: %pS -> %pS p %p r %i ",
 			   cl, (void *) cl->ip, cl->fn, cl->parent,
 			   r & CLOSURE_REMAINING_MASK);
 
@@ -177,7 +179,7 @@ static int debug_seq_show(struct seq_file *f, void *data)
 			   r & CLOSURE_RUNNING	? "R" : "");
 
 		if (r & CLOSURE_WAITING)
-			seq_printf(f, " W %pF\n",
+			seq_printf(f, " W %pS\n",
 				   (void *) cl->waiting_on);
 
 		seq_printf(f, "\n");
diff --git a/drivers/md/bcache/closure.h b/drivers/md/bcache/closure.h
index 7c2c5bc7c88b..eca0d496b686 100644
--- a/drivers/md/bcache/closure.h
+++ b/drivers/md/bcache/closure.h
@@ -159,7 +159,7 @@ struct closure {
 #define CLOSURE_MAGIC_DEAD	0xc054dead
 #define CLOSURE_MAGIC_ALIVE	0xc054a11e
 
-	unsigned		magic;
+	unsigned int		magic;
 	struct list_head	all;
 	unsigned long		ip;
 	unsigned long		waiting_on;
@@ -289,10 +289,12 @@ static inline void closure_init_stack(struct closure *cl)
 }
 
 /**
- * closure_wake_up - wake up all closures on a wait list.
+ * closure_wake_up - wake up all closures on a wait list,
+ *		     with memory barrier
  */
 static inline void closure_wake_up(struct closure_waitlist *list)
 {
+	/* Memory barrier for the wait list */
 	smp_mb();
 	__closure_wake_up(list);
 }
diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c
index 12034c07257b..06da66b2488a 100644
--- a/drivers/md/bcache/debug.c
+++ b/drivers/md/bcache/debug.c
@@ -67,34 +67,35 @@ void bch_btree_verify(struct btree *b)
 	if (inmemory->keys != sorted->keys ||
 	    memcmp(inmemory->start,
 		   sorted->start,
-		   (void *) bset_bkey_last(inmemory) - (void *) inmemory->start)) {
+		   (void *) bset_bkey_last(inmemory) -
+		   (void *) inmemory->start)) {
 		struct bset *i;
-		unsigned j;
+		unsigned int j;
 
 		console_lock();
 
-		printk(KERN_ERR "*** in memory:\n");
+		pr_err("*** in memory:\n");
 		bch_dump_bset(&b->keys, inmemory, 0);
 
-		printk(KERN_ERR "*** read back in:\n");
+		pr_err("*** read back in:\n");
 		bch_dump_bset(&v->keys, sorted, 0);
 
 		for_each_written_bset(b, ondisk, i) {
-			unsigned block = ((void *) i - (void *) ondisk) /
+			unsigned int block = ((void *) i - (void *) ondisk) /
 				block_bytes(b->c);
 
-			printk(KERN_ERR "*** on disk block %u:\n", block);
+			pr_err("*** on disk block %u:\n", block);
 			bch_dump_bset(&b->keys, i, block);
 		}
 
-		printk(KERN_ERR "*** block %zu not written\n",
+		pr_err("*** block %zu not written\n",
 		       ((void *) i - (void *) ondisk) / block_bytes(b->c));
 
 		for (j = 0; j < inmemory->keys; j++)
 			if (inmemory->d[j] != sorted->d[j])
 				break;
 
-		printk(KERN_ERR "b->written %u\n", b->written);
+		pr_err("b->written %u\n", b->written);
 
 		console_unlock();
 		panic("verify failed at %u\n", j);
@@ -176,9 +177,9 @@ static ssize_t bch_dump_read(struct file *file, char __user *buf,
 
 	while (size) {
 		struct keybuf_key *w;
-		unsigned bytes = min(i->bytes, size);
-
+		unsigned int bytes = min(i->bytes, size);
 		int err = copy_to_user(buf, i->buf, bytes);
+
 		if (err)
 			return err;
 
@@ -237,8 +238,8 @@ void bch_debug_init_cache_set(struct cache_set *c)
 {
 	if (!IS_ERR_OR_NULL(bcache_debug)) {
 		char name[50];
-		snprintf(name, 50, "bcache-%pU", c->sb.set_uuid);
 
+		snprintf(name, 50, "bcache-%pU", c->sb.set_uuid);
 		c->debug = debugfs_create_file(name, 0400, bcache_debug, c,
 					       &cache_set_debug_ops);
 	}
diff --git a/drivers/md/bcache/debug.h b/drivers/md/bcache/debug.h
index acc48d3fa274..fb3d4dff4b26 100644
--- a/drivers/md/bcache/debug.h
+++ b/drivers/md/bcache/debug.h
@@ -8,8 +8,8 @@ struct cache_set;
 
 #ifdef CONFIG_BCACHE_DEBUG
 
-void bch_btree_verify(struct btree *);
-void bch_data_verify(struct cached_dev *, struct bio *);
+void bch_btree_verify(struct btree *b);
+void bch_data_verify(struct cached_dev *dc, struct bio *bio);
 
 #define expensive_debug_checks(c)	((c)->expensive_debug_checks)
 #define key_merging_disabled(c)		((c)->key_merging_disabled)
@@ -27,7 +27,7 @@ static inline void bch_data_verify(struct cached_dev *dc, struct bio *bio) {}
 #endif
 
 #ifdef CONFIG_DEBUG_FS
-void bch_debug_init_cache_set(struct cache_set *);
+void bch_debug_init_cache_set(struct cache_set *c);
 #else
 static inline void bch_debug_init_cache_set(struct cache_set *c) {}
 #endif
diff --git a/drivers/md/bcache/extents.c b/drivers/md/bcache/extents.c
index 1d096742eb41..c809724e6571 100644
--- a/drivers/md/bcache/extents.c
+++ b/drivers/md/bcache/extents.c
@@ -46,7 +46,7 @@ static bool bch_key_sort_cmp(struct btree_iter_set l,
 
 static bool __ptr_invalid(struct cache_set *c, const struct bkey *k)
 {
-	unsigned i;
+	unsigned int i;
 
 	for (i = 0; i < KEY_PTRS(k); i++)
 		if (ptr_available(c, k, i)) {
@@ -67,7 +67,7 @@ static bool __ptr_invalid(struct cache_set *c, const struct bkey *k)
 
 static const char *bch_ptr_status(struct cache_set *c, const struct bkey *k)
 {
-	unsigned i;
+	unsigned int i;
 
 	for (i = 0; i < KEY_PTRS(k); i++)
 		if (ptr_available(c, k, i)) {
@@ -96,7 +96,7 @@ static const char *bch_ptr_status(struct cache_set *c, const struct bkey *k)
 
 void bch_extent_to_text(char *buf, size_t size, const struct bkey *k)
 {
-	unsigned i = 0;
+	unsigned int i = 0;
 	char *out = buf, *end = buf + size;
 
 #define p(...)	(out += scnprintf(out, end - out, __VA_ARGS__))
@@ -126,22 +126,22 @@ void bch_extent_to_text(char *buf, size_t size, const struct bkey *k)
 static void bch_bkey_dump(struct btree_keys *keys, const struct bkey *k)
 {
 	struct btree *b = container_of(keys, struct btree, keys);
-	unsigned j;
+	unsigned int j;
 	char buf[80];
 
 	bch_extent_to_text(buf, sizeof(buf), k);
-	printk(" %s", buf);
+	pr_err(" %s", buf);
 
 	for (j = 0; j < KEY_PTRS(k); j++) {
 		size_t n = PTR_BUCKET_NR(b->c, k, j);
-		printk(" bucket %zu", n);
 
+		pr_err(" bucket %zu", n);
 		if (n >= b->c->sb.first_bucket && n < b->c->sb.nbuckets)
-			printk(" prio %i",
+			pr_err(" prio %i",
 			       PTR_BUCKET(b->c, k, j)->prio);
 	}
 
-	printk(" %s\n", bch_ptr_status(b->c, k));
+	pr_err(" %s\n", bch_ptr_status(b->c, k));
 }
 
 /* Btree ptrs */
@@ -166,12 +166,13 @@ bad:
 static bool bch_btree_ptr_invalid(struct btree_keys *bk, const struct bkey *k)
 {
 	struct btree *b = container_of(bk, struct btree, keys);
+
 	return __bch_btree_ptr_invalid(b->c, k);
 }
 
 static bool btree_ptr_bad_expensive(struct btree *b, const struct bkey *k)
 {
-	unsigned i;
+	unsigned int i;
 	char buf[80];
 	struct bucket *g;
 
@@ -204,7 +205,7 @@ err:
 static bool bch_btree_ptr_bad(struct btree_keys *bk, const struct bkey *k)
 {
 	struct btree *b = container_of(bk, struct btree, keys);
-	unsigned i;
+	unsigned int i;
 
 	if (!bkey_cmp(k, &ZERO_KEY) ||
 	    !KEY_PTRS(k) ||
@@ -327,13 +328,14 @@ static bool bch_extent_insert_fixup(struct btree_keys *b,
 	struct cache_set *c = container_of(b, struct btree, keys)->c;
 
 	uint64_t old_offset;
-	unsigned old_size, sectors_found = 0;
+	unsigned int old_size, sectors_found = 0;
 
 	BUG_ON(!KEY_OFFSET(insert));
 	BUG_ON(!KEY_SIZE(insert));
 
 	while (1) {
 		struct bkey *k = bch_btree_iter_next(iter);
+
 		if (!k)
 			break;
 
@@ -363,7 +365,7 @@ static bool bch_extent_insert_fixup(struct btree_keys *b,
 			 * k might have been split since we inserted/found the
 			 * key we're replacing
 			 */
-			unsigned i;
+			unsigned int i;
 			uint64_t offset = KEY_START(k) -
 				KEY_START(replace_key);
 
@@ -498,11 +500,12 @@ bad:
 static bool bch_extent_invalid(struct btree_keys *bk, const struct bkey *k)
 {
 	struct btree *b = container_of(bk, struct btree, keys);
+
 	return __bch_extent_invalid(b->c, k);
 }
 
 static bool bch_extent_bad_expensive(struct btree *b, const struct bkey *k,
-				     unsigned ptr)
+				     unsigned int ptr)
 {
 	struct bucket *g = PTR_BUCKET(b->c, k, ptr);
 	char buf[80];
@@ -534,7 +537,7 @@ err:
 static bool bch_extent_bad(struct btree_keys *bk, const struct bkey *k)
 {
 	struct btree *b = container_of(bk, struct btree, keys);
-	unsigned i, stale;
+	unsigned int i, stale;
 
 	if (!KEY_PTRS(k) ||
 	    bch_extent_invalid(bk, k))
@@ -574,10 +577,12 @@ static uint64_t merge_chksums(struct bkey *l, struct bkey *r)
 		~((uint64_t)1 << 63);
 }
 
-static bool bch_extent_merge(struct btree_keys *bk, struct bkey *l, struct bkey *r)
+static bool bch_extent_merge(struct btree_keys *bk,
+			     struct bkey *l,
+			     struct bkey *r)
 {
 	struct btree *b = container_of(bk, struct btree, keys);
-	unsigned i;
+	unsigned int i;
 
 	if (key_merging_disabled(b->c))
 		return false;
diff --git a/drivers/md/bcache/extents.h b/drivers/md/bcache/extents.h
index 0cd3575afa1d..4d667e05bb73 100644
--- a/drivers/md/bcache/extents.h
+++ b/drivers/md/bcache/extents.h
@@ -8,8 +8,8 @@ extern const struct btree_keys_ops bch_extent_keys_ops;
 struct bkey;
 struct cache_set;
 
-void bch_extent_to_text(char *, size_t, const struct bkey *);
-bool __bch_btree_ptr_invalid(struct cache_set *, const struct bkey *);
-bool __bch_extent_invalid(struct cache_set *, const struct bkey *);
+void bch_extent_to_text(char *buf, size_t size, const struct bkey *k);
+bool __bch_btree_ptr_invalid(struct cache_set *c, const struct bkey *k);
+bool __bch_extent_invalid(struct cache_set *c, const struct bkey *k);
 
 #endif /* _BCACHE_EXTENTS_H */
diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
index 9612873afee2..c25097968319 100644
--- a/drivers/md/bcache/io.c
+++ b/drivers/md/bcache/io.c
@@ -17,6 +17,7 @@
 void bch_bbio_free(struct bio *bio, struct cache_set *c)
 {
 	struct bbio *b = container_of(bio, struct bbio, bio);
+
 	mempool_free(b, &c->bio_meta);
 }
 
@@ -42,9 +43,10 @@ void __bch_submit_bbio(struct bio *bio, struct cache_set *c)
 }
 
 void bch_submit_bbio(struct bio *bio, struct cache_set *c,
-		     struct bkey *k, unsigned ptr)
+		     struct bkey *k, unsigned int ptr)
 {
 	struct bbio *b = container_of(bio, struct bbio, bio);
+
 	bch_bkey_copy_single_ptr(&b->key, k, ptr);
 	__bch_submit_bbio(bio, c);
 }
@@ -52,7 +54,7 @@ void bch_submit_bbio(struct bio *bio, struct cache_set *c,
 /* IO errors */
 void bch_count_backing_io_errors(struct cached_dev *dc, struct bio *bio)
 {
-	unsigned errors;
+	unsigned int errors;
 
 	WARN_ONCE(!dc, "NULL pointer of struct cached_dev");
 
@@ -75,16 +77,16 @@ void bch_count_io_errors(struct cache *ca,
 	 */
 
 	if (ca->set->error_decay) {
-		unsigned count = atomic_inc_return(&ca->io_count);
+		unsigned int count = atomic_inc_return(&ca->io_count);
 
 		while (count > ca->set->error_decay) {
-			unsigned errors;
-			unsigned old = count;
-			unsigned new = count - ca->set->error_decay;
+			unsigned int errors;
+			unsigned int old = count;
+			unsigned int new = count - ca->set->error_decay;
 
 			/*
 			 * First we subtract refresh from count; each time we
-			 * succesfully do so, we rescale the errors once:
+			 * successfully do so, we rescale the errors once:
 			 */
 
 			count = atomic_cmpxchg(&ca->io_count, old, new);
@@ -104,7 +106,7 @@ void bch_count_io_errors(struct cache *ca,
 	}
 
 	if (error) {
-		unsigned errors = atomic_add_return(1 << IO_ERROR_SHIFT,
+		unsigned int errors = atomic_add_return(1 << IO_ERROR_SHIFT,
 						    &ca->io_errors);
 		errors >>= IO_ERROR_SHIFT;
 
@@ -126,18 +128,18 @@ void bch_bbio_count_io_errors(struct cache_set *c, struct bio *bio,
 	struct cache *ca = PTR_CACHE(c, &b->key, 0);
 	int is_read = (bio_data_dir(bio) == READ ? 1 : 0);
 
-	unsigned threshold = op_is_write(bio_op(bio))
+	unsigned int threshold = op_is_write(bio_op(bio))
 		? c->congested_write_threshold_us
 		: c->congested_read_threshold_us;
 
 	if (threshold) {
-		unsigned t = local_clock_us();
-
+		unsigned int t = local_clock_us();
 		int us = t - b->submit_time_us;
 		int congested = atomic_read(&c->congested);
 
 		if (us > (int) threshold) {
 			int ms = us / 1024;
+
 			c->congested_last_us = t;
 
 			ms = min(ms, CONGESTED_MAX + congested);
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index 10748c626a1d..6116bbf870d8 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -28,11 +28,12 @@
 static void journal_read_endio(struct bio *bio)
 {
 	struct closure *cl = bio->bi_private;
+
 	closure_put(cl);
 }
 
 static int journal_read_bucket(struct cache *ca, struct list_head *list,
-			       unsigned bucket_index)
+			       unsigned int bucket_index)
 {
 	struct journal_device *ja = &ca->journal;
 	struct bio *bio = &ja->bio;
@@ -40,7 +41,7 @@ static int journal_read_bucket(struct cache *ca, struct list_head *list,
 	struct journal_replay *i;
 	struct jset *j, *data = ca->set->journal.w[0].data;
 	struct closure cl;
-	unsigned len, left, offset = 0;
+	unsigned int len, left, offset = 0;
 	int ret = 0;
 	sector_t bucket = bucket_to_sector(ca->set, ca->sb.d[bucket_index]);
 
@@ -50,7 +51,7 @@ static int journal_read_bucket(struct cache *ca, struct list_head *list,
 
 	while (offset < ca->sb.bucket_size) {
 reread:		left = ca->sb.bucket_size - offset;
-		len = min_t(unsigned, left, PAGE_SECTORS << JSET_BITS);
+		len = min_t(unsigned int, left, PAGE_SECTORS << JSET_BITS);
 
 		bio_reset(bio);
 		bio->bi_iter.bi_sector	= bucket + offset;
@@ -154,12 +155,12 @@ int bch_journal_read(struct cache_set *c, struct list_head *list)
 	})
 
 	struct cache *ca;
-	unsigned iter;
+	unsigned int iter;
 
 	for_each_cache(ca, c, iter) {
 		struct journal_device *ja = &ca->journal;
 		DECLARE_BITMAP(bitmap, SB_JOURNAL_BUCKETS);
-		unsigned i, l, r, m;
+		unsigned int i, l, r, m;
 		uint64_t seq;
 
 		bitmap_zero(bitmap, SB_JOURNAL_BUCKETS);
@@ -192,7 +193,8 @@ int bch_journal_read(struct cache_set *c, struct list_head *list)
 
 		for (l = find_first_zero_bit(bitmap, ca->sb.njournal_buckets);
 		     l < ca->sb.njournal_buckets;
-		     l = find_next_zero_bit(bitmap, ca->sb.njournal_buckets, l + 1))
+		     l = find_next_zero_bit(bitmap, ca->sb.njournal_buckets,
+					    l + 1))
 			if (read_bucket(l))
 				goto bsearch;
 
@@ -304,7 +306,7 @@ void bch_journal_mark(struct cache_set *c, struct list_head *list)
 		     k < bset_bkey_last(&i->j);
 		     k = bkey_next(k))
 			if (!__bch_extent_invalid(c, k)) {
-				unsigned j;
+				unsigned int j;
 
 				for (j = 0; j < KEY_PTRS(k); j++)
 					if (ptr_available(c, k, j))
@@ -492,7 +494,7 @@ static void journal_reclaim(struct cache_set *c)
 	struct bkey *k = &c->journal.key;
 	struct cache *ca;
 	uint64_t last_seq;
-	unsigned iter, n = 0;
+	unsigned int iter, n = 0;
 	atomic_t p __maybe_unused;
 
 	atomic_long_inc(&c->reclaim);
@@ -526,7 +528,7 @@ static void journal_reclaim(struct cache_set *c)
 
 	for_each_cache(ca, c, iter) {
 		struct journal_device *ja = &ca->journal;
-		unsigned next = (ja->cur_idx + 1) % ca->sb.njournal_buckets;
+		unsigned int next = (ja->cur_idx + 1) % ca->sb.njournal_buckets;
 
 		/* No space available on this device */
 		if (next == ja->discard_idx)
@@ -580,7 +582,7 @@ static void journal_write_endio(struct bio *bio)
 	closure_put(&w->c->journal.io);
 }
 
-static void journal_write(struct closure *);
+static void journal_write(struct closure *cl);
 
 static void journal_write_done(struct closure *cl)
 {
@@ -609,11 +611,12 @@ static void journal_write_unlocked(struct closure *cl)
 	struct cache *ca;
 	struct journal_write *w = c->journal.cur;
 	struct bkey *k = &c->journal.key;
-	unsigned i, sectors = set_blocks(w->data, block_bytes(c)) *
+	unsigned int i, sectors = set_blocks(w->data, block_bytes(c)) *
 		c->sb.block_size;
 
 	struct bio *bio;
 	struct bio_list list;
+
 	bio_list_init(&list);
 
 	if (!w->need_write) {
@@ -705,7 +708,7 @@ static void journal_try_write(struct cache_set *c)
 }
 
 static struct journal_write *journal_wait_for_write(struct cache_set *c,
-						    unsigned nkeys)
+						    unsigned int nkeys)
 	__acquires(&c->journal.lock)
 {
 	size_t sectors;
diff --git a/drivers/md/bcache/journal.h b/drivers/md/bcache/journal.h
index b5788199188f..66f0facff84b 100644
--- a/drivers/md/bcache/journal.h
+++ b/drivers/md/bcache/journal.h
@@ -110,7 +110,7 @@ struct journal {
 	struct delayed_work	work;
 
 	/* Number of blocks free in the bucket(s) we're currently writing to */
-	unsigned		blocks_free;
+	unsigned int		blocks_free;
 	uint64_t		seq;
 	DECLARE_FIFO(atomic_t, pin);
 
@@ -131,13 +131,13 @@ struct journal_device {
 	uint64_t		seq[SB_JOURNAL_BUCKETS];
 
 	/* Journal bucket we're currently writing to */
-	unsigned		cur_idx;
+	unsigned int		cur_idx;
 
 	/* Last journal bucket that still contains an open journal entry */
-	unsigned		last_idx;
+	unsigned int		last_idx;
 
 	/* Next journal bucket to be discarded */
-	unsigned		discard_idx;
+	unsigned int		discard_idx;
 
 #define DISCARD_READY		0
 #define DISCARD_IN_FLIGHT	1
@@ -167,14 +167,16 @@ struct cache_set;
 struct btree_op;
 struct keylist;
 
-atomic_t *bch_journal(struct cache_set *, struct keylist *, struct closure *);
-void bch_journal_next(struct journal *);
-void bch_journal_mark(struct cache_set *, struct list_head *);
-void bch_journal_meta(struct cache_set *, struct closure *);
-int bch_journal_read(struct cache_set *, struct list_head *);
-int bch_journal_replay(struct cache_set *, struct list_head *);
-
-void bch_journal_free(struct cache_set *);
-int bch_journal_alloc(struct cache_set *);
+atomic_t *bch_journal(struct cache_set *c,
+		      struct keylist *keys,
+		      struct closure *parent);
+void bch_journal_next(struct journal *j);
+void bch_journal_mark(struct cache_set *c, struct list_head *list);
+void bch_journal_meta(struct cache_set *c, struct closure *cl);
+int bch_journal_read(struct cache_set *c, struct list_head *list);
+int bch_journal_replay(struct cache_set *c, struct list_head *list);
+
+void bch_journal_free(struct cache_set *c);
+int bch_journal_alloc(struct cache_set *c);
 
 #endif /* _BCACHE_JOURNAL_H */
diff --git a/drivers/md/bcache/movinggc.c b/drivers/md/bcache/movinggc.c
index a24c3a95b2c0..7891fb512736 100644
--- a/drivers/md/bcache/movinggc.c
+++ b/drivers/md/bcache/movinggc.c
@@ -23,7 +23,7 @@ static bool moving_pred(struct keybuf *buf, struct bkey *k)
 {
 	struct cache_set *c = container_of(buf, struct cache_set,
 					   moving_gc_keys);
-	unsigned i;
+	unsigned int i;
 
 	for (i = 0; i < KEY_PTRS(k); i++)
 		if (ptr_available(c, k, i) &&
@@ -38,6 +38,7 @@ static bool moving_pred(struct keybuf *buf, struct bkey *k)
 static void moving_io_destructor(struct closure *cl)
 {
 	struct moving_io *io = container_of(cl, struct moving_io, cl);
+
 	kfree(io);
 }
 
@@ -186,9 +187,10 @@ static bool bucket_cmp(struct bucket *l, struct bucket *r)
 	return GC_SECTORS_USED(l) < GC_SECTORS_USED(r);
 }
 
-static unsigned bucket_heap_top(struct cache *ca)
+static unsigned int bucket_heap_top(struct cache *ca)
 {
 	struct bucket *b;
+
 	return (b = heap_peek(&ca->heap)) ? GC_SECTORS_USED(b) : 0;
 }
 
@@ -196,7 +198,7 @@ void bch_moving_gc(struct cache_set *c)
 {
 	struct cache *ca;
 	struct bucket *b;
-	unsigned i;
+	unsigned int i;
 
 	if (!c->copy_gc_enabled)
 		return;
@@ -204,9 +206,9 @@ void bch_moving_gc(struct cache_set *c)
 	mutex_lock(&c->bucket_lock);
 
 	for_each_cache(ca, c, i) {
-		unsigned sectors_to_move = 0;
-		unsigned reserve_sectors = ca->sb.bucket_size *
-			fifo_used(&ca->free[RESERVE_MOVINGGC]);
+		unsigned int sectors_to_move = 0;
+		unsigned int reserve_sectors = ca->sb.bucket_size *
+			     fifo_used(&ca->free[RESERVE_MOVINGGC]);
 
 		ca->heap.used = 0;
 
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 7dbe8b6316a0..51be355a3309 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -25,9 +25,9 @@
 
 struct kmem_cache *bch_search_cache;
 
-static void bch_data_insert_start(struct closure *);
+static void bch_data_insert_start(struct closure *cl);
 
-static unsigned cache_mode(struct cached_dev *dc)
+static unsigned int cache_mode(struct cached_dev *dc)
 {
 	return BDEV_CACHE_MODE(&dc->sb);
 }
@@ -45,6 +45,7 @@ static void bio_csum(struct bio *bio, struct bkey *k)
 
 	bio_for_each_segment(bv, bio, iter) {
 		void *d = kmap(bv.bv_page) + bv.bv_offset;
+
 		csum = bch_crc64_update(csum, d, bv.bv_len);
 		kunmap(bv.bv_page);
 	}
@@ -98,7 +99,7 @@ static void bch_data_insert_keys(struct closure *cl)
 	closure_return(cl);
 }
 
-static int bch_keylist_realloc(struct keylist *l, unsigned u64s,
+static int bch_keylist_realloc(struct keylist *l, unsigned int u64s,
 			       struct cache_set *c)
 {
 	size_t oldsize = bch_keylist_nkeys(l);
@@ -125,7 +126,7 @@ static void bch_data_invalidate(struct closure *cl)
 		 bio_sectors(bio), (uint64_t) bio->bi_iter.bi_sector);
 
 	while (bio_sectors(bio)) {
-		unsigned sectors = min(bio_sectors(bio),
+		unsigned int sectors = min(bio_sectors(bio),
 				       1U << (KEY_SIZE_BITS - 1));
 
 		if (bch_keylist_realloc(&op->insert_keys, 2, op->c))
@@ -135,7 +136,9 @@ static void bch_data_invalidate(struct closure *cl)
 		bio->bi_iter.bi_size	-= sectors << 9;
 
 		bch_keylist_add(&op->insert_keys,
-				&KEY(op->inode, bio->bi_iter.bi_sector, sectors));
+				&KEY(op->inode,
+				     bio->bi_iter.bi_sector,
+				     sectors));
 	}
 
 	op->insert_data_done = true;
@@ -151,7 +154,7 @@ static void bch_data_insert_error(struct closure *cl)
 
 	/*
 	 * Our data write just errored, which means we've got a bunch of keys to
-	 * insert that point to data that wasn't succesfully written.
+	 * insert that point to data that wasn't successfully written.
 	 *
 	 * We don't have to insert those keys but we still have to invalidate
 	 * that region of the cache - so, if we just strip off all the pointers
@@ -211,7 +214,7 @@ static void bch_data_insert_start(struct closure *cl)
 	bio->bi_opf &= ~(REQ_PREFLUSH|REQ_FUA);
 
 	do {
-		unsigned i;
+		unsigned int i;
 		struct bkey *k;
 		struct bio_set *split = &op->c->bio_split;
 
@@ -328,7 +331,7 @@ void bch_data_insert(struct closure *cl)
 
 /* Congested? */
 
-unsigned bch_get_congested(struct cache_set *c)
+unsigned int bch_get_congested(struct cache_set *c)
 {
 	int i;
 	long rand;
@@ -372,8 +375,8 @@ static struct hlist_head *iohash(struct cached_dev *dc, uint64_t k)
 static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
 {
 	struct cache_set *c = dc->disk.c;
-	unsigned mode = cache_mode(dc);
-	unsigned sectors, congested = bch_get_congested(c);
+	unsigned int mode = cache_mode(dc);
+	unsigned int sectors, congested = bch_get_congested(c);
 	struct task_struct *task = current;
 	struct io *i;
 
@@ -469,11 +472,11 @@ struct search {
 	struct bio		*cache_miss;
 	struct bcache_device	*d;
 
-	unsigned		insert_bio_sectors;
-	unsigned		recoverable:1;
-	unsigned		write:1;
-	unsigned		read_dirty_data:1;
-	unsigned		cache_missed:1;
+	unsigned int		insert_bio_sectors;
+	unsigned int		recoverable:1;
+	unsigned int		write:1;
+	unsigned int		read_dirty_data:1;
+	unsigned int		cache_missed:1;
 
 	unsigned long		start_time;
 
@@ -514,20 +517,20 @@ static int cache_lookup_fn(struct btree_op *op, struct btree *b, struct bkey *k)
 	struct search *s = container_of(op, struct search, op);
 	struct bio *n, *bio = &s->bio.bio;
 	struct bkey *bio_key;
-	unsigned ptr;
+	unsigned int ptr;
 
 	if (bkey_cmp(k, &KEY(s->iop.inode, bio->bi_iter.bi_sector, 0)) <= 0)
 		return MAP_CONTINUE;
 
 	if (KEY_INODE(k) != s->iop.inode ||
 	    KEY_START(k) > bio->bi_iter.bi_sector) {
-		unsigned bio_sectors = bio_sectors(bio);
-		unsigned sectors = KEY_INODE(k) == s->iop.inode
+		unsigned int bio_sectors = bio_sectors(bio);
+		unsigned int sectors = KEY_INODE(k) == s->iop.inode
 			? min_t(uint64_t, INT_MAX,
 				KEY_START(k) - bio->bi_iter.bi_sector)
 			: INT_MAX;
-
 		int ret = s->d->cache_miss(b, s, bio, sectors);
+
 		if (ret != MAP_CONTINUE)
 			return ret;
 
@@ -623,6 +626,7 @@ static void request_endio(struct bio *bio)
 
 	if (bio->bi_status) {
 		struct search *s = container_of(cl, struct search, cl);
+
 		s->iop.status = bio->bi_status;
 		/* Only cache read errors are recoverable */
 		s->recoverable = false;
@@ -813,7 +817,8 @@ static void cached_dev_read_done(struct closure *cl)
 
 	if (s->iop.bio) {
 		bio_reset(s->iop.bio);
-		s->iop.bio->bi_iter.bi_sector = s->cache_miss->bi_iter.bi_sector;
+		s->iop.bio->bi_iter.bi_sector =
+			s->cache_miss->bi_iter.bi_sector;
 		bio_copy_dev(s->iop.bio, s->cache_miss);
 		s->iop.bio->bi_iter.bi_size = s->insert_bio_sectors << 9;
 		bch_bio_map(s->iop.bio, NULL);
@@ -856,10 +861,10 @@ static void cached_dev_read_done_bh(struct closure *cl)
 }
 
 static int cached_dev_cache_miss(struct btree *b, struct search *s,
-				 struct bio *bio, unsigned sectors)
+				 struct bio *bio, unsigned int sectors)
 {
 	int ret = MAP_CONTINUE;
-	unsigned reada = 0;
+	unsigned int reada = 0;
 	struct cached_dev *dc = container_of(s->d, struct cached_dev, disk);
 	struct bio *miss, *cache_bio;
 
@@ -1212,6 +1217,7 @@ static int cached_dev_ioctl(struct bcache_device *d, fmode_t mode,
 			    unsigned int cmd, unsigned long arg)
 {
 	struct cached_dev *dc = container_of(d, struct cached_dev, disk);
+
 	return __blkdev_driver_ioctl(dc->bdev, mode, cmd, arg);
 }
 
@@ -1226,7 +1232,7 @@ static int cached_dev_congested(void *data, int bits)
 		return 1;
 
 	if (cached_dev_get(dc)) {
-		unsigned i;
+		unsigned int i;
 		struct cache *ca;
 
 		for_each_cache(ca, d->c, i) {
@@ -1253,9 +1259,9 @@ void bch_cached_dev_request_init(struct cached_dev *dc)
 /* Flash backed devices */
 
 static int flash_dev_cache_miss(struct btree *b, struct search *s,
-				struct bio *bio, unsigned sectors)
+				struct bio *bio, unsigned int sectors)
 {
-	unsigned bytes = min(sectors, bio_sectors(bio)) << 9;
+	unsigned int bytes = min(sectors, bio_sectors(bio)) << 9;
 
 	swap(bio->bi_iter.bi_size, bytes);
 	zero_fill_bio(bio);
@@ -1338,7 +1344,7 @@ static int flash_dev_congested(void *data, int bits)
 	struct bcache_device *d = data;
 	struct request_queue *q;
 	struct cache *ca;
-	unsigned i;
+	unsigned int i;
 	int ret = 0;
 
 	for_each_cache(ca, d->c, i) {
@@ -1361,8 +1367,7 @@ void bch_flash_dev_request_init(struct bcache_device *d)
 
 void bch_request_exit(void)
 {
-	if (bch_search_cache)
-		kmem_cache_destroy(bch_search_cache);
+	kmem_cache_destroy(bch_search_cache);
 }
 
 int __init bch_request_init(void)
diff --git a/drivers/md/bcache/request.h b/drivers/md/bcache/request.h
index dea0886b81c1..aa055cfeb099 100644
--- a/drivers/md/bcache/request.h
+++ b/drivers/md/bcache/request.h
@@ -8,7 +8,7 @@ struct data_insert_op {
 	struct bio		*bio;
 	struct workqueue_struct *wq;
 
-	unsigned		inode;
+	unsigned int		inode;
 	uint16_t		write_point;
 	uint16_t		write_prio;
 	blk_status_t		status;
@@ -17,15 +17,15 @@ struct data_insert_op {
 		uint16_t	flags;
 
 	struct {
-		unsigned	bypass:1;
-		unsigned	writeback:1;
-		unsigned	flush_journal:1;
-		unsigned	csum:1;
+		unsigned int	bypass:1;
+		unsigned int	writeback:1;
+		unsigned int	flush_journal:1;
+		unsigned int	csum:1;
 
-		unsigned	replace:1;
-		unsigned	replace_collision:1;
+		unsigned int	replace:1;
+		unsigned int	replace_collision:1;
 
-		unsigned	insert_data_done:1;
+		unsigned int	insert_data_done:1;
 	};
 	};
 
@@ -33,7 +33,7 @@ struct data_insert_op {
 	BKEY_PADDED(replace_key);
 };
 
-unsigned bch_get_congested(struct cache_set *);
+unsigned int bch_get_congested(struct cache_set *c);
 void bch_data_insert(struct closure *cl);
 
 void bch_cached_dev_request_init(struct cached_dev *dc);
diff --git a/drivers/md/bcache/stats.c b/drivers/md/bcache/stats.c
index be119326297b..894410f3f829 100644
--- a/drivers/md/bcache/stats.c
+++ b/drivers/md/bcache/stats.c
@@ -33,11 +33,11 @@
  * stored left shifted by 16, and scaled back in the sysfs show() function.
  */
 
-static const unsigned DAY_RESCALE		= 288;
-static const unsigned HOUR_RESCALE		= 12;
-static const unsigned FIVE_MINUTE_RESCALE	= 1;
-static const unsigned accounting_delay		= (HZ * 300) / 22;
-static const unsigned accounting_weight		= 32;
+static const unsigned int DAY_RESCALE		= 288;
+static const unsigned int HOUR_RESCALE		= 12;
+static const unsigned int FIVE_MINUTE_RESCALE	= 1;
+static const unsigned int accounting_delay	= (HZ * 300) / 22;
+static const unsigned int accounting_weight	= 32;
 
 /* sysfs reading/writing */
 
@@ -152,7 +152,7 @@ static void scale_accounting(struct timer_list *t)
 	struct cache_accounting *acc = from_timer(acc, t, timer);
 
 #define move_stat(name) do {						\
-	unsigned t = atomic_xchg(&acc->collector.name, 0);		\
+	unsigned int t = atomic_xchg(&acc->collector.name, 0);		\
 	t <<= 16;							\
 	acc->five_minute.name += t;					\
 	acc->hour.name += t;						\
@@ -200,6 +200,7 @@ void bch_mark_cache_accounting(struct cache_set *c, struct bcache_device *d,
 			       bool hit, bool bypass)
 {
 	struct cached_dev *dc = container_of(d, struct cached_dev, disk);
+
 	mark_cache_stats(&dc->accounting.collector, hit, bypass);
 	mark_cache_stats(&c->accounting.collector, hit, bypass);
 }
@@ -207,6 +208,7 @@ void bch_mark_cache_accounting(struct cache_set *c, struct bcache_device *d,
 void bch_mark_cache_readahead(struct cache_set *c, struct bcache_device *d)
 {
 	struct cached_dev *dc = container_of(d, struct cached_dev, disk);
+
 	atomic_inc(&dc->accounting.collector.cache_readaheads);
 	atomic_inc(&c->accounting.collector.cache_readaheads);
 }
@@ -214,6 +216,7 @@ void bch_mark_cache_readahead(struct cache_set *c, struct bcache_device *d)
 void bch_mark_cache_miss_collision(struct cache_set *c, struct bcache_device *d)
 {
 	struct cached_dev *dc = container_of(d, struct cached_dev, disk);
+
 	atomic_inc(&dc->accounting.collector.cache_miss_collisions);
 	atomic_inc(&c->accounting.collector.cache_miss_collisions);
 }
diff --git a/drivers/md/bcache/stats.h b/drivers/md/bcache/stats.h
index 0b70f9de0c03..abfaabf7e7fc 100644
--- a/drivers/md/bcache/stats.h
+++ b/drivers/md/bcache/stats.h
@@ -23,7 +23,7 @@ struct cache_stats {
 	unsigned long cache_miss_collisions;
 	unsigned long sectors_bypassed;
 
-	unsigned		rescale;
+	unsigned int		rescale;
 };
 
 struct cache_accounting {
@@ -53,10 +53,13 @@ void bch_cache_accounting_clear(struct cache_accounting *acc);
 
 void bch_cache_accounting_destroy(struct cache_accounting *acc);
 
-void bch_mark_cache_accounting(struct cache_set *, struct bcache_device *,
-			       bool, bool);
-void bch_mark_cache_readahead(struct cache_set *, struct bcache_device *);
-void bch_mark_cache_miss_collision(struct cache_set *, struct bcache_device *);
-void bch_mark_sectors_bypassed(struct cache_set *, struct cached_dev *, int);
+void bch_mark_cache_accounting(struct cache_set *c, struct bcache_device *d,
+			       bool hit, bool bypass);
+void bch_mark_cache_readahead(struct cache_set *c, struct bcache_device *d);
+void bch_mark_cache_miss_collision(struct cache_set *c,
+				   struct bcache_device *d);
+void bch_mark_sectors_bypassed(struct cache_set *c,
+			       struct cached_dev *dc,
+			       int sectors);
 
 #endif /* _BCACHE_STATS_H_ */
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 55a37641aa95..94c756c66bd7 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * bcache setup/teardown code, and some metadata io - read a superblock and
  * figure out what to do with it.
@@ -61,7 +62,7 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
 	const char *err;
 	struct cache_sb *s;
 	struct buffer_head *bh = __bread(bdev, 1, SB_SIZE);
-	unsigned i;
+	unsigned int i;
 
 	if (!bh)
 		return "IO error";
@@ -149,7 +150,8 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
 			goto err;
 
 		err = "Invalid superblock: device too small";
-		if (get_capacity(bdev->bd_disk) < sb->bucket_size * sb->nbuckets)
+		if (get_capacity(bdev->bd_disk) <
+		    sb->bucket_size * sb->nbuckets)
 			goto err;
 
 		err = "Bad UUID";
@@ -202,7 +204,7 @@ static void write_bdev_super_endio(struct bio *bio)
 static void __write_super(struct cache_sb *sb, struct bio *bio)
 {
 	struct cache_sb *out = page_address(bio_first_page_all(bio));
-	unsigned i;
+	unsigned int i;
 
 	bio->bi_iter.bi_sector	= SB_SECTOR;
 	bio->bi_iter.bi_size	= SB_SIZE;
@@ -282,7 +284,7 @@ void bcache_write_super(struct cache_set *c)
 {
 	struct closure *cl = &c->sb_write;
 	struct cache *ca;
-	unsigned i;
+	unsigned int i;
 
 	down(&c->sb_write_mutex);
 	closure_init(cl, &c->cl);
@@ -334,7 +336,7 @@ static void uuid_io(struct cache_set *c, int op, unsigned long op_flags,
 {
 	struct closure *cl = &c->uuid_write;
 	struct uuid_entry *u;
-	unsigned i;
+	unsigned int i;
 	char buf[80];
 
 	BUG_ON(!parent);
@@ -415,8 +417,8 @@ static int __uuid_write(struct cache_set *c)
 {
 	BKEY_PADDED(key) k;
 	struct closure cl;
-	closure_init_stack(&cl);
 
+	closure_init_stack(&cl);
 	lockdep_assert_held(&bch_register_lock);
 
 	if (bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, 1, true))
@@ -456,6 +458,7 @@ static struct uuid_entry *uuid_find(struct cache_set *c, const char *uuid)
 static struct uuid_entry *uuid_find_empty(struct cache_set *c)
 {
 	static const char zero_uuid[16] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+
 	return uuid_find(c, zero_uuid);
 }
 
@@ -463,8 +466,8 @@ static struct uuid_entry *uuid_find_empty(struct cache_set *c)
  * Bucket priorities/gens:
  *
  * For each bucket, we store on disk its
-   * 8 bit gen
-   * 16 bit priority
+ *   8 bit gen
+ *  16 bit priority
  *
  * See alloc.c for an explanation of the gen. The priority is used to implement
  * lru (and in the future other) cache replacement policies; for most purposes
@@ -587,7 +590,7 @@ static void prio_read(struct cache *ca, uint64_t bucket)
 	struct prio_set *p = ca->disk_buckets;
 	struct bucket_disk *d = p->data + prios_per_bucket(ca), *end = d;
 	struct bucket *b;
-	unsigned bucket_nr = 0;
+	unsigned int bucket_nr = 0;
 
 	for (b = ca->buckets;
 	     b < ca->buckets + ca->sb.nbuckets;
@@ -599,7 +602,8 @@ static void prio_read(struct cache *ca, uint64_t bucket)
 
 			prio_io(ca, bucket, REQ_OP_READ, 0);
 
-			if (p->csum != bch_crc64(&p->magic, bucket_bytes(ca) - 8))
+			if (p->csum !=
+			    bch_crc64(&p->magic, bucket_bytes(ca) - 8))
 				pr_warn("bad csum reading priorities");
 
 			if (p->magic != pset_magic(&ca->sb))
@@ -619,6 +623,7 @@ static void prio_read(struct cache *ca, uint64_t bucket)
 static int open_dev(struct block_device *b, fmode_t mode)
 {
 	struct bcache_device *d = b->bd_disk->private_data;
+
 	if (test_bit(BCACHE_DEV_CLOSING, &d->flags))
 		return -ENXIO;
 
@@ -629,6 +634,7 @@ static int open_dev(struct block_device *b, fmode_t mode)
 static void release_dev(struct gendisk *b, fmode_t mode)
 {
 	struct bcache_device *d = b->private_data;
+
 	closure_put(&d->cl);
 }
 
@@ -662,7 +668,7 @@ static void bcache_device_unlink(struct bcache_device *d)
 	lockdep_assert_held(&bch_register_lock);
 
 	if (d->c && !test_and_set_bit(BCACHE_DEV_UNLINK_DONE, &d->flags)) {
-		unsigned i;
+		unsigned int i;
 		struct cache *ca;
 
 		sysfs_remove_link(&d->c->kobj, d->name);
@@ -676,7 +682,7 @@ static void bcache_device_unlink(struct bcache_device *d)
 static void bcache_device_link(struct bcache_device *d, struct cache_set *c,
 			       const char *name)
 {
-	unsigned i;
+	unsigned int i;
 	struct cache *ca;
 
 	for_each_cache(ca, d->c, i)
@@ -715,7 +721,7 @@ static void bcache_device_detach(struct bcache_device *d)
 }
 
 static void bcache_device_attach(struct bcache_device *d, struct cache_set *c,
-				 unsigned id)
+				 unsigned int id)
 {
 	d->id = id;
 	d->c = c;
@@ -762,7 +768,7 @@ static void bcache_device_free(struct bcache_device *d)
 	closure_debug_destroy(&d->cl);
 }
 
-static int bcache_device_init(struct bcache_device *d, unsigned block_size,
+static int bcache_device_init(struct bcache_device *d, unsigned int block_size,
 			      sector_t sectors)
 {
 	struct request_queue *q;
@@ -778,7 +784,7 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
 
 	if (!d->nr_stripes || d->nr_stripes > max_stripes) {
 		pr_err("nr_stripes too large or invalid: %u (start sector beyond end of disk?)",
-			(unsigned)d->nr_stripes);
+			(unsigned int)d->nr_stripes);
 		return -ENOMEM;
 	}
 
@@ -919,6 +925,7 @@ void bch_cached_dev_run(struct cached_dev *dc)
 	if (!d->c &&
 	    BDEV_STATE(&dc->sb) != BDEV_STATE_NONE) {
 		struct closure cl;
+
 		closure_init_stack(&cl);
 
 		SET_BDEV_STATE(&dc->sb, BDEV_STATE_STALE);
@@ -928,8 +935,10 @@ void bch_cached_dev_run(struct cached_dev *dc)
 
 	add_disk(d->disk);
 	bd_link_disk_holder(dc->bdev, dc->disk.disk);
-	/* won't show up in the uevent file, use udevadm monitor -e instead
-	 * only class / kset properties are persistent */
+	/*
+	 * won't show up in the uevent file, use udevadm monitor -e instead
+	 * only class / kset properties are persistent
+	 */
 	kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);
 	kfree(env[1]);
 	kfree(env[2]);
@@ -976,6 +985,7 @@ static void cached_dev_detach_finish(struct work_struct *w)
 {
 	struct cached_dev *dc = container_of(w, struct cached_dev, detach);
 	struct closure cl;
+
 	closure_init_stack(&cl);
 
 	BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags));
@@ -1097,12 +1107,14 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
 		}
 	}
 
-	/* Deadlocks since we're called via sysfs...
-	sysfs_remove_file(&dc->kobj, &sysfs_attach);
+	/*
+	 * Deadlocks since we're called via sysfs...
+	 * sysfs_remove_file(&dc->kobj, &sysfs_attach);
 	 */
 
 	if (bch_is_zero(u->uuid, 16)) {
 		struct closure cl;
+
 		closure_init_stack(&cl);
 
 		memcpy(u->uuid, dc->sb.uuid, 16);
@@ -1124,11 +1136,11 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
 	list_move(&dc->list, &c->cached_devs);
 	calc_cached_dev_sectors(c);
 
-	smp_wmb();
 	/*
 	 * dc->c must be set before dc->count != 0 - paired with the mb in
 	 * cached_dev_get()
 	 */
+	smp_wmb();
 	refcount_set(&dc->count, 1);
 
 	/* Block writeback thread, but spawn it */
@@ -1212,7 +1224,7 @@ static void cached_dev_flush(struct closure *cl)
 	continue_at(cl, cached_dev_free, system_wq);
 }
 
-static int cached_dev_init(struct cached_dev *dc, unsigned block_size)
+static int cached_dev_init(struct cached_dev *dc, unsigned int block_size)
 {
 	int ret;
 	struct io *io;
@@ -1320,6 +1332,7 @@ void bch_flash_dev_release(struct kobject *kobj)
 static void flash_dev_free(struct closure *cl)
 {
 	struct bcache_device *d = container_of(cl, struct bcache_device, cl);
+
 	mutex_lock(&bch_register_lock);
 	atomic_long_sub(bcache_dev_sectors_dirty(d),
 			&d->c->flash_dev_dirty_sectors);
@@ -1459,17 +1472,18 @@ bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...)
 	if (test_and_set_bit(CACHE_SET_IO_DISABLE, &c->flags))
 		pr_info("CACHE_SET_IO_DISABLE already set");
 
-	/* XXX: we can be called from atomic context
-	acquire_console_sem();
-	*/
+	/*
+	 * XXX: we can be called from atomic context
+	 * acquire_console_sem();
+	 */
 
-	printk(KERN_ERR "bcache: error on %pU: ", c->sb.set_uuid);
+	pr_err("bcache: error on %pU: ", c->sb.set_uuid);
 
 	va_start(args, fmt);
 	vprintk(fmt, args);
 	va_end(args);
 
-	printk(", disabling caching\n");
+	pr_err(", disabling caching\n");
 
 	if (c->on_error == ON_ERROR_PANIC)
 		panic("panic forced after error\n");
@@ -1481,6 +1495,7 @@ bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...)
 void bch_cache_set_release(struct kobject *kobj)
 {
 	struct cache_set *c = container_of(kobj, struct cache_set, kobj);
+
 	kfree(c);
 	module_put(THIS_MODULE);
 }
@@ -1489,7 +1504,7 @@ static void cache_set_free(struct closure *cl)
 {
 	struct cache_set *c = container_of(cl, struct cache_set, cl);
 	struct cache *ca;
-	unsigned i;
+	unsigned int i;
 
 	if (!IS_ERR_OR_NULL(c->debug))
 		debugfs_remove(c->debug);
@@ -1532,7 +1547,7 @@ static void cache_set_flush(struct closure *cl)
 	struct cache_set *c = container_of(cl, struct cache_set, caching);
 	struct cache *ca;
 	struct btree *b;
-	unsigned i;
+	unsigned int i;
 
 	bch_cache_accounting_destroy(&c->accounting);
 
@@ -1671,6 +1686,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
 {
 	int iter_size;
 	struct cache_set *c = kzalloc(sizeof(struct cache_set), GFP_KERNEL);
+
 	if (!c)
 		return NULL;
 
@@ -1731,8 +1747,8 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
 	if (!(c->devices = kcalloc(c->nr_uuids, sizeof(void *), GFP_KERNEL)) ||
 	    mempool_init_slab_pool(&c->search, 32, bch_search_cache) ||
 	    mempool_init_kmalloc_pool(&c->bio_meta, 2,
-				      sizeof(struct bbio) + sizeof(struct bio_vec) *
-				      bucket_pages(c)) ||
+				sizeof(struct bbio) + sizeof(struct bio_vec) *
+				bucket_pages(c)) ||
 	    mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
 	    bioset_init(&c->bio_split, 4, offsetof(struct bbio, bio),
 			BIOSET_NEED_BVECS|BIOSET_NEED_RESCUER) ||
@@ -1762,7 +1778,7 @@ static void run_cache_set(struct cache_set *c)
 	struct cached_dev *dc, *t;
 	struct cache *ca;
 	struct closure cl;
-	unsigned i;
+	unsigned int i;
 
 	closure_init_stack(&cl);
 
@@ -1804,7 +1820,9 @@ static void run_cache_set(struct cache_set *c)
 			goto err;
 
 		err = "error reading btree root";
-		c->root = bch_btree_node_get(c, NULL, k, j->btree_level, true, NULL);
+		c->root = bch_btree_node_get(c, NULL, k,
+					     j->btree_level,
+					     true, NULL);
 		if (IS_ERR_OR_NULL(c->root))
 			goto err;
 
@@ -1853,7 +1871,7 @@ static void run_cache_set(struct cache_set *c)
 		pr_notice("invalidating existing data");
 
 		for_each_cache(ca, c, i) {
-			unsigned j;
+			unsigned int j;
 
 			ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7,
 					      2, SB_JOURNAL_BUCKETS);
@@ -1998,7 +2016,7 @@ err:
 void bch_cache_release(struct kobject *kobj)
 {
 	struct cache *ca = container_of(kobj, struct cache, kobj);
-	unsigned i;
+	unsigned int i;
 
 	if (ca->set) {
 		BUG_ON(ca->set->cache[ca->sb.nr_this_dev] != ca);
@@ -2098,7 +2116,9 @@ static int register_cache(struct cache_sb *sb, struct page *sb_page,
 		goto err;
 	}
 
-	if (kobject_add(&ca->kobj, &part_to_dev(bdev->bd_part)->kobj, "bcache")) {
+	if (kobject_add(&ca->kobj,
+			&part_to_dev(bdev->bd_part)->kobj,
+			"bcache")) {
 		err = "error calling kobject_add";
 		ret = -ENOMEM;
 		goto out;
@@ -2127,13 +2147,14 @@ err:
 
 /* Global interfaces/init */
 
-static ssize_t register_bcache(struct kobject *, struct kobj_attribute *,
-			       const char *, size_t);
+static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
+			       const char *buffer, size_t size);
 
 kobj_attribute_write(register,		register_bcache);
 kobj_attribute_write(register_quiet,	register_bcache);
 
-static bool bch_is_open_backing(struct block_device *bdev) {
+static bool bch_is_open_backing(struct block_device *bdev)
+{
 	struct cache_set *c, *tc;
 	struct cached_dev *dc, *t;
 
@@ -2147,10 +2168,11 @@ static bool bch_is_open_backing(struct block_device *bdev) {
 	return false;
 }
 
-static bool bch_is_open_cache(struct block_device *bdev) {
+static bool bch_is_open_cache(struct block_device *bdev)
+{
 	struct cache_set *c, *tc;
 	struct cache *ca;
-	unsigned i;
+	unsigned int i;
 
 	list_for_each_entry_safe(c, tc, &bch_cache_sets, list)
 		for_each_cache(ca, c, i)
@@ -2159,7 +2181,8 @@ static bool bch_is_open_cache(struct block_device *bdev) {
 	return false;
 }
 
-static bool bch_is_open(struct block_device *bdev) {
+static bool bch_is_open(struct block_device *bdev)
+{
 	return bch_is_open_cache(bdev) || bch_is_open_backing(bdev);
 }
 
@@ -2216,6 +2239,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
 	err = "failed to register device";
 	if (SB_IS_BDEV(sb)) {
 		struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL);
+
 		if (!dc)
 			goto err_close;
 
@@ -2224,6 +2248,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
 		mutex_unlock(&bch_register_lock);
 	} else {
 		struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
+
 		if (!ca)
 			goto err_close;
 
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 81d3520b0702..150cf4f4cf74 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -130,8 +130,10 @@ rw_attribute(btree_shrinker_disabled);
 rw_attribute(copy_gc_enabled);
 rw_attribute(size);
 
-static ssize_t bch_snprint_string_list(char *buf, size_t size, const char * const list[],
-			    size_t selected)
+static ssize_t bch_snprint_string_list(char *buf,
+				       size_t size,
+				       const char * const list[],
+				       size_t selected)
 {
 	char *out = buf;
 	size_t i;
@@ -148,7 +150,7 @@ SHOW(__bch_cached_dev)
 {
 	struct cached_dev *dc = container_of(kobj, struct cached_dev,
 					     disk.kobj);
-	const char *states[] = { "no cache", "clean", "dirty", "inconsistent" };
+	char const *states[] = { "no cache", "clean", "dirty", "inconsistent" };
 	int wb = dc->writeback_running;
 
 #define var(stat)		(dc->stat)
@@ -307,7 +309,7 @@ STORE(__cached_dev)
 		if (v < 0)
 			return v;
 
-		if ((unsigned) v != BDEV_CACHE_MODE(&dc->sb)) {
+		if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) {
 			SET_BDEV_CACHE_MODE(&dc->sb, v);
 			bch_write_bdev_super(dc, NULL);
 		}
@@ -341,8 +343,9 @@ STORE(__cached_dev)
 		add_uevent_var(env, "DRIVER=bcache");
 		add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid),
 		add_uevent_var(env, "CACHED_LABEL=%s", buf);
-		kobject_uevent_env(
-			&disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp);
+		kobject_uevent_env(&disk_to_dev(dc->disk.disk)->kobj,
+				   KOBJ_CHANGE,
+				   env->envp);
 		kfree(env);
 	}
 
@@ -459,6 +462,7 @@ STORE(__bch_flash_dev)
 
 	if (attr == &sysfs_size) {
 		uint64_t v;
+
 		strtoi_h_or_return(buf, v);
 
 		u->sectors = v >> 9;
@@ -533,9 +537,9 @@ static int bch_bset_print_stats(struct cache_set *c, char *buf)
 			op.stats.floats, op.stats.failed);
 }
 
-static unsigned bch_root_usage(struct cache_set *c)
+static unsigned int bch_root_usage(struct cache_set *c)
 {
-	unsigned bytes = 0;
+	unsigned int bytes = 0;
 	struct bkey *k;
 	struct btree *b;
 	struct btree_iter iter;
@@ -570,9 +574,9 @@ static size_t bch_cache_size(struct cache_set *c)
 	return ret;
 }
 
-static unsigned bch_cache_max_chain(struct cache_set *c)
+static unsigned int bch_cache_max_chain(struct cache_set *c)
 {
-	unsigned ret = 0;
+	unsigned int ret = 0;
 	struct hlist_head *h;
 
 	mutex_lock(&c->bucket_lock);
@@ -580,7 +584,7 @@ static unsigned bch_cache_max_chain(struct cache_set *c)
 	for (h = c->bucket_hash;
 	     h < c->bucket_hash + (1 << BUCKET_HASH_BITS);
 	     h++) {
-		unsigned i = 0;
+		unsigned int i = 0;
 		struct hlist_node *p;
 
 		hlist_for_each(p, h)
@@ -593,13 +597,13 @@ static unsigned bch_cache_max_chain(struct cache_set *c)
 	return ret;
 }
 
-static unsigned bch_btree_used(struct cache_set *c)
+static unsigned int bch_btree_used(struct cache_set *c)
 {
 	return div64_u64(c->gc_stats.key_bytes * 100,
 			 (c->gc_stats.nodes ?: 1) * btree_bytes(c));
 }
 
-static unsigned bch_average_key_size(struct cache_set *c)
+static unsigned int bch_average_key_size(struct cache_set *c)
 {
 	return c->gc_stats.nkeys
 		? div64_u64(c->gc_stats.data, c->gc_stats.nkeys)
@@ -703,6 +707,7 @@ STORE(__bch_cache_set)
 	if (attr == &sysfs_flash_vol_create) {
 		int r;
 		uint64_t v;
+
 		strtoi_h_or_return(buf, v);
 
 		r = bch_flash_dev_create(c, v);
@@ -736,6 +741,7 @@ STORE(__bch_cache_set)
 
 	if (attr == &sysfs_prune_cache) {
 		struct shrink_control sc;
+
 		sc.gfp_mask = GFP_KERNEL;
 		sc.nr_to_scan = strtoul_or_return(buf);
 		c->shrink.scan_objects(&c->shrink, &sc);
@@ -789,12 +795,14 @@ STORE_LOCKED(bch_cache_set)
 SHOW(bch_cache_set_internal)
 {
 	struct cache_set *c = container_of(kobj, struct cache_set, internal);
+
 	return bch_cache_set_show(&c->kobj, attr, buf);
 }
 
 STORE(bch_cache_set_internal)
 {
 	struct cache_set *c = container_of(kobj, struct cache_set, internal);
+
 	return bch_cache_set_store(&c->kobj, attr, buf, size);
 }
 
@@ -996,7 +1004,7 @@ STORE(__bch_cache)
 		if (v < 0)
 			return v;
 
-		if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) {
+		if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) {
 			mutex_lock(&ca->set->bucket_lock);
 			SET_CACHE_REPLACEMENT(&ca->sb, v);
 			mutex_unlock(&ca->set->bucket_lock);
diff --git a/drivers/md/bcache/sysfs.h b/drivers/md/bcache/sysfs.h
index b54fe9602529..3fe82425859c 100644
--- a/drivers/md/bcache/sysfs.h
+++ b/drivers/md/bcache/sysfs.h
@@ -44,9 +44,9 @@ STORE(fn)								\
 	static struct attribute sysfs_##_name =				\
 		{ .name = #_name, .mode = _mode }
 
-#define write_attribute(n)	__sysfs_attribute(n, S_IWUSR)
-#define read_attribute(n)	__sysfs_attribute(n, S_IRUGO)
-#define rw_attribute(n)		__sysfs_attribute(n, S_IRUGO|S_IWUSR)
+#define write_attribute(n)	__sysfs_attribute(n, 0200)
+#define read_attribute(n)	__sysfs_attribute(n, 0444)
+#define rw_attribute(n)		__sysfs_attribute(n, 0644)
 
 #define sysfs_printf(file, fmt, ...)					\
 do {									\
diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c
index c6a99dfa1ad9..20eddeac1531 100644
--- a/drivers/md/bcache/util.c
+++ b/drivers/md/bcache/util.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * random utiility code, for bcache but in theory not specific to bcache
  *
@@ -133,6 +134,7 @@ bool bch_is_zero(const char *p, size_t n)
 int bch_parse_uuid(const char *s, char *uuid)
 {
 	size_t i, j, x;
+
 	memset(uuid, 0, 16);
 
 	for (i = 0, j = 0;
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index 5ff055f0a653..00aab6abcfe4 100644
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -289,10 +289,10 @@ do {									\
 #define ANYSINT_MAX(t)							\
 	((((t) 1 << (sizeof(t) * 8 - 2)) - (t) 1) * (t) 2 + (t) 1)
 
-int bch_strtoint_h(const char *, int *);
-int bch_strtouint_h(const char *, unsigned int *);
-int bch_strtoll_h(const char *, long long *);
-int bch_strtoull_h(const char *, unsigned long long *);
+int bch_strtoint_h(const char *cp, int *res);
+int bch_strtouint_h(const char *cp, unsigned int *res);
+int bch_strtoll_h(const char *cp, long long *res);
+int bch_strtoull_h(const char *cp, unsigned long long *res);
 
 static inline int bch_strtol_h(const char *cp, long *res)
 {
@@ -348,7 +348,7 @@ static inline int bch_strtoul_h(const char *cp, long *res)
 	snprintf(buf, size,						\
 		__builtin_types_compatible_p(typeof(var), int)		\
 		     ? "%i\n" :						\
-		__builtin_types_compatible_p(typeof(var), unsigned)	\
+		__builtin_types_compatible_p(typeof(var), unsigned int)	\
 		     ? "%u\n" :						\
 		__builtin_types_compatible_p(typeof(var), long)		\
 		     ? "%li\n" :					\
@@ -380,7 +380,7 @@ struct time_stats {
 
 void bch_time_stats_update(struct time_stats *stats, uint64_t time);
 
-static inline unsigned local_clock_us(void)
+static inline unsigned int local_clock_us(void)
 {
 	return local_clock() >> 10;
 }
@@ -403,7 +403,8 @@ do {									\
 	__print_time_stat(stats, name,					\
 			  average_duration,	duration_units);	\
 	sysfs_print(name ## _ ##max_duration ## _ ## duration_units,	\
-			div_u64((stats)->max_duration, NSEC_PER_ ## duration_units));\
+			div_u64((stats)->max_duration,			\
+				NSEC_PER_ ## duration_units));		\
 									\
 	sysfs_print(name ## _last_ ## frequency_units, (stats)->last	\
 		    ? div_s64(local_clock() - (stats)->last,		\
@@ -560,9 +561,10 @@ static inline uint64_t bch_crc64_update(uint64_t crc,
 }
 
 /* Does linear interpolation between powers of two */
-static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
+static inline unsigned int fract_exp_two(unsigned int x,
+					 unsigned int fract_bits)
 {
-	unsigned fract = x & ~(~0 << fract_bits);
+	unsigned int fract = x & ~(~0 << fract_bits);
 
 	x >>= fract_bits;
 	x   = 1 << x;
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index 481d4cf38ac0..6be05bd7ca67 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -215,7 +215,8 @@ static void update_writeback_rate(struct work_struct *work)
 	smp_mb();
 }
 
-static unsigned writeback_delay(struct cached_dev *dc, unsigned sectors)
+static unsigned int writeback_delay(struct cached_dev *dc,
+				    unsigned int sectors)
 {
 	if (test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) ||
 	    !dc->writeback_percent)
@@ -249,6 +250,7 @@ static void dirty_init(struct keybuf_key *w)
 static void dirty_io_destructor(struct closure *cl)
 {
 	struct dirty_io *io = container_of(cl, struct dirty_io, cl);
+
 	kfree(io);
 }
 
@@ -263,7 +265,7 @@ static void write_dirty_finish(struct closure *cl)
 	/* This is kind of a dumb way of signalling errors. */
 	if (KEY_DIRTY(&w->key)) {
 		int ret;
-		unsigned i;
+		unsigned int i;
 		struct keylist keys;
 
 		bch_keylist_init(&keys);
@@ -377,7 +379,7 @@ static void read_dirty_submit(struct closure *cl)
 
 static void read_dirty(struct cached_dev *dc)
 {
-	unsigned delay = 0;
+	unsigned int delay = 0;
 	struct keybuf_key *next, *keys[MAX_WRITEBACKS_IN_PASS], *w;
 	size_t size;
 	int nk, i;
@@ -442,7 +444,8 @@ static void read_dirty(struct cached_dev *dc)
 
 			io = kzalloc(sizeof(struct dirty_io) +
 				     sizeof(struct bio_vec) *
-				     DIV_ROUND_UP(KEY_SIZE(&w->key), PAGE_SECTORS),
+				     DIV_ROUND_UP(KEY_SIZE(&w->key),
+						  PAGE_SECTORS),
 				     GFP_KERNEL);
 			if (!io)
 				goto err;
@@ -465,7 +468,8 @@ static void read_dirty(struct cached_dev *dc)
 
 			down(&dc->in_flight);
 
-			/* We've acquired a semaphore for the maximum
+			/*
+			 * We've acquired a semaphore for the maximum
 			 * simultaneous number of writebacks; from here
 			 * everything happens asynchronously.
 			 */
@@ -498,11 +502,11 @@ err:
 
 /* Scan for dirty data */
 
-void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned inode,
+void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned int inode,
 				  uint64_t offset, int nr_sectors)
 {
 	struct bcache_device *d = c->devices[inode];
-	unsigned stripe_offset, stripe, sectors_dirty;
+	unsigned int stripe_offset, stripe, sectors_dirty;
 
 	if (!d)
 		return;
@@ -514,7 +518,7 @@ void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned inode,
 	stripe_offset = offset & (d->stripe_size - 1);
 
 	while (nr_sectors) {
-		int s = min_t(unsigned, abs(nr_sectors),
+		int s = min_t(unsigned int, abs(nr_sectors),
 			      d->stripe_size - stripe_offset);
 
 		if (nr_sectors < 0)
@@ -538,7 +542,9 @@ void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned inode,
 
 static bool dirty_pred(struct keybuf *buf, struct bkey *k)
 {
-	struct cached_dev *dc = container_of(buf, struct cached_dev, writeback_keys);
+	struct cached_dev *dc = container_of(buf,
+					     struct cached_dev,
+					     writeback_keys);
 
 	BUG_ON(KEY_INODE(k) != dc->disk.id);
 
@@ -548,7 +554,7 @@ static bool dirty_pred(struct keybuf *buf, struct bkey *k)
 static void refill_full_stripes(struct cached_dev *dc)
 {
 	struct keybuf *buf = &dc->writeback_keys;
-	unsigned start_stripe, stripe, next_stripe;
+	unsigned int start_stripe, stripe, next_stripe;
 	bool wrapped = false;
 
 	stripe = offset_to_stripe(&dc->disk, KEY_OFFSET(&buf->last_scanned));
@@ -688,7 +694,7 @@ static int bch_writeback_thread(void *arg)
 		read_dirty(dc);
 
 		if (searched_full_index) {
-			unsigned delay = dc->writeback_delay * HZ;
+			unsigned int delay = dc->writeback_delay * HZ;
 
 			while (delay &&
 			       !kthread_should_stop() &&
@@ -712,7 +718,7 @@ static int bch_writeback_thread(void *arg)
 
 struct sectors_dirty_init {
 	struct btree_op	op;
-	unsigned	inode;
+	unsigned int	inode;
 	size_t		count;
 	struct bkey	start;
 };
diff --git a/drivers/md/bcache/writeback.h b/drivers/md/bcache/writeback.h
index 3745d7004c47..d2b9fdbc8994 100644
--- a/drivers/md/bcache/writeback.h
+++ b/drivers/md/bcache/writeback.h
@@ -28,7 +28,7 @@ static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d)
 	return ret;
 }
 
-static inline unsigned offset_to_stripe(struct bcache_device *d,
+static inline unsigned int offset_to_stripe(struct bcache_device *d,
 					uint64_t offset)
 {
 	do_div(offset, d->stripe_size);
@@ -37,9 +37,9 @@ static inline unsigned offset_to_stripe(struct bcache_device *d,
 
 static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc,
 					   uint64_t offset,
-					   unsigned nr_sectors)
+					   unsigned int nr_sectors)
 {
-	unsigned stripe = offset_to_stripe(&dc->disk, offset);
+	unsigned int stripe = offset_to_stripe(&dc->disk, offset);
 
 	while (1) {
 		if (atomic_read(dc->disk.stripe_sectors_dirty + stripe))
@@ -54,9 +54,9 @@ static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc,
 }
 
 static inline bool should_writeback(struct cached_dev *dc, struct bio *bio,
-				    unsigned cache_mode, bool would_skip)
+				    unsigned int cache_mode, bool would_skip)
 {
-	unsigned in_use = dc->disk.c->gc_stats.in_use;
+	unsigned int in_use = dc->disk.c->gc_stats.in_use;
 
 	if (cache_mode != CACHE_MODE_WRITEBACK ||
 	    test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) ||
@@ -96,10 +96,11 @@ static inline void bch_writeback_add(struct cached_dev *dc)
 	}
 }
 
-void bcache_dev_sectors_dirty_add(struct cache_set *, unsigned, uint64_t, int);
+void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned int inode,
+				  uint64_t offset, int nr_sectors);
 
-void bch_sectors_dirty_init(struct bcache_device *);
-void bch_cached_dev_writeback_init(struct cached_dev *);
-int bch_cached_dev_writeback_start(struct cached_dev *);
+void bch_sectors_dirty_init(struct bcache_device *d);
+void bch_cached_dev_writeback_init(struct cached_dev *dc);
+int bch_cached_dev_writeback_start(struct cached_dev *dc);
 
 #endif
diff --git a/include/uapi/linux/bcache.h b/include/uapi/linux/bcache.h
index 8d19e02d752a..5d4f58e059fd 100644
--- a/include/uapi/linux/bcache.h
+++ b/include/uapi/linux/bcache.h
@@ -30,10 +30,10 @@ struct bkey {
 	BITMASK(name, struct bkey, field, offset, size)
 
 #define PTR_FIELD(name, offset, size)					\
-static inline __u64 name(const struct bkey *k, unsigned i)		\
+static inline __u64 name(const struct bkey *k, unsigned int i)		\
 { return (k->ptr[i] >> offset) & ~(~0ULL << size); }			\
 									\
-static inline void SET_##name(struct bkey *k, unsigned i, __u64 v)	\
+static inline void SET_##name(struct bkey *k, unsigned int i, __u64 v)	\
 {									\
 	k->ptr[i] &= ~(~(~0ULL << size) << offset);			\
 	k->ptr[i] |= (v & ~(~0ULL << size)) << offset;			\
@@ -117,12 +117,14 @@ static inline void bkey_copy_key(struct bkey *dest, const struct bkey *src)
 static inline struct bkey *bkey_next(const struct bkey *k)
 {
 	__u64 *d = (void *) k;
+
 	return (struct bkey *) (d + bkey_u64s(k));
 }
 
-static inline struct bkey *bkey_idx(const struct bkey *k, unsigned nr_keys)
+static inline struct bkey *bkey_idx(const struct bkey *k, unsigned int nr_keys)
 {
 	__u64 *d = (void *) k;
+
 	return (struct bkey *) (d + nr_keys);
 }
 /* Enough for a key with 6 pointers */
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 2a24a59e99c5..2868d85f1fb1 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1829,6 +1829,10 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
 	mutex_lock(&q->blk_trace_mutex);
 
 	if (attr == &dev_attr_enable) {
+		if (!!value == !!q->blk_trace) {
+			ret = 0;
+			goto out_unlock_bdev;
+		}
 		if (value)
 			ret = blk_trace_setup_queue(q, bdev);
 		else