bcache: Move spinlock into struct time_stats

Minor cleanup.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>

drivers/md/bcache/bcache.h

@@ -666,11 +666,9 @@ struct cache_set {
 	unsigned		congested_read_threshold_us;
 	unsigned		congested_write_threshold_us;
 
-	spinlock_t		sort_time_lock;
 	struct time_stats	sort_time;
 	struct time_stats	btree_gc_time;
 	struct time_stats	btree_split_time;
-	spinlock_t		btree_read_time_lock;
 	struct time_stats	btree_read_time;
 	struct time_stats	try_harder_time;
 

drivers/md/bcache/bset.c

@@ -1077,11 +1077,8 @@ static void __btree_sort(struct btree *b, struct btree_iter *iter,
 	if (b->written)
 		bset_build_written_tree(b);
 
-	if (!start) {
-		spin_lock(&b->c->sort_time_lock);
+	if (!start)
 		bch_time_stats_update(&b->c->sort_time, start_time);
-		spin_unlock(&b->c->sort_time_lock);
-	}
 }
 
 void bch_btree_sort_partial(struct btree *b, unsigned start)
@@ -1128,9 +1125,7 @@ void bch_btree_sort_into(struct btree *b, struct btree *new)
 
 	btree_mergesort(b, new->sets->data, &iter, false, true);
 
-	spin_lock(&b->c->sort_time_lock);
 	bch_time_stats_update(&b->c->sort_time, start_time);
-	spin_unlock(&b->c->sort_time_lock);
 
 	bkey_copy_key(&new->key, &b->key);
 	new->sets->size = 0;

drivers/md/bcache/btree.c

@@ -317,10 +317,7 @@ void bch_btree_node_read(struct btree *b)
 		goto err;
 
 	bch_btree_node_read_done(b);
-
-	spin_lock(&b->c->btree_read_time_lock);
 	bch_time_stats_update(&b->c->btree_read_time, start_time);
-	spin_unlock(&b->c->btree_read_time_lock);
 
 	return;
 err:

drivers/md/bcache/super.c

@@ -1435,9 +1435,13 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
 	init_waitqueue_head(&c->try_wait);
 	init_waitqueue_head(&c->bucket_wait);
 	closure_init_unlocked(&c->uuid_write);
-	spin_lock_init(&c->sort_time_lock);
 	mutex_init(&c->sort_lock);
-	spin_lock_init(&c->btree_read_time_lock);
+
+	spin_lock_init(&c->sort_time.lock);
+	spin_lock_init(&c->btree_gc_time.lock);
+	spin_lock_init(&c->btree_split_time.lock);
+	spin_lock_init(&c->btree_read_time.lock);
+	spin_lock_init(&c->try_harder_time.lock);
 
 	bch_moving_init_cache_set(c);
 

drivers/md/bcache/util.c

@@ -168,10 +168,14 @@ int bch_parse_uuid(const char *s, char *uuid)
 
 void bch_time_stats_update(struct time_stats *stats, uint64_t start_time)
 {
-	uint64_t now		= local_clock();
-	uint64_t duration	= time_after64(now, start_time)
+	uint64_t now, duration, last;
+
+	spin_lock(&stats->lock);
+
+	now		= local_clock();
+	duration	= time_after64(now, start_time)
 		? now - start_time : 0;
-	uint64_t last		= time_after64(now, stats->last)
+	last		= time_after64(now, stats->last)
 		? now - stats->last : 0;
 
 	stats->max_duration = max(stats->max_duration, duration);
@@ -188,6 +192,8 @@ void bch_time_stats_update(struct time_stats *stats, uint64_t start_time)
 	}
 
 	stats->last = now ?: 1;
+
+	spin_unlock(&stats->lock);
 }
 
 /**

drivers/md/bcache/util.h

@@ -378,6 +378,7 @@ ssize_t bch_snprint_string_list(char *buf, size_t size, const char * const list[
 ssize_t bch_read_string_list(const char *buf, const char * const list[]);
 
 struct time_stats {
+	spinlock_t	lock;
 	/*
 	 * all fields are in nanoseconds, averages are ewmas stored left shifted
 	 * by 8