dm bufio: move dm_bufio_client members to avoid spanning cachelines

Movement also consolidates holes in dm_bufio_client struct. But the
overall size of the struct isn't changed.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

drivers/md/dm-bufio.c

@@ -936,13 +936,16 @@ static void cache_remove_range(struct dm_buffer_cache *bc,
  *	context.
  */
 struct dm_bufio_client {
-	struct mutex lock;
-	spinlock_t spinlock;
-	bool no_sleep;
-
 	struct block_device *bdev;
 	unsigned int block_size;
 	s8 sectors_per_block_bits;
+
+	bool no_sleep;
+	struct mutex lock;
+	spinlock_t spinlock;
+
+	int async_write_error;
+
 	void (*alloc_callback)(struct dm_buffer *buf);
 	void (*write_callback)(struct dm_buffer *buf);
 	struct kmem_cache *slab_buffer;
@@ -954,23 +957,22 @@ struct dm_bufio_client {
 
 	unsigned int minimum_buffers;
 
-	struct dm_buffer_cache cache;
-	wait_queue_head_t free_buffer_wait;
-
 	sector_t start;
 
-	int async_write_error;
-
-	struct list_head client_list;
-
 	struct shrinker shrinker;
 	struct work_struct shrink_work;
 	atomic_long_t need_shrink;
 
+	wait_queue_head_t free_buffer_wait;
+
+	struct list_head client_list;
+
 	/*
 	 * Used by global_cleanup to sort the clients list.
 	 */
 	unsigned long oldest_buffer;
+
+	struct dm_buffer_cache cache;
 };
 
 static DEFINE_STATIC_KEY_FALSE(no_sleep_enabled);