btrfs: add assertion helpers for spinning readers

Add helpers for conditional DEBUG build to assert that the extent buffer
spinning_readers constraints are met. Will be used in followup patches.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/locking.c

@@ -32,10 +32,23 @@ static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb)
 	WARN_ON(atomic_read(&eb->spinning_writers));
 }
 
+static void btrfs_assert_spinning_readers_get(struct extent_buffer *eb)
+{
+	atomic_inc(&eb->spinning_readers);
+}
+
+static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb)
+{
+	WARN_ON(atomic_read(&eb->spinning_readers) == 0);
+	atomic_dec(&eb->spinning_readers);
+}
+
 #else
 static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb) { }
 static void btrfs_assert_spinning_writers_put(struct extent_buffer *eb) { }
 static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb) { }
+static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb) { }
+static void btrfs_assert_spinning_readers_get(struct extent_buffer *eb) { }
 #endif
 
 void btrfs_set_lock_blocking_read(struct extent_buffer *eb)