+static bool wb_io_lists_populated(struct bdi_writeback *wb)
+{
+ if (wb_has_dirty_io(wb)) {
+ return false;
+ } else {
+ set_bit(WB_has_dirty_io, &wb->state);
+ return true;
+ }
+}
+
+static void wb_io_lists_depopulated(struct bdi_writeback *wb)
+{
+ if (wb_has_dirty_io(wb) && list_empty(&wb->b_dirty) &&
+ list_empty(&wb->b_io) && list_empty(&wb->b_more_io))
+ clear_bit(WB_has_dirty_io, &wb->state);
+}
+
+/**
+ * inode_wb_list_move_locked - move an inode onto a bdi_writeback IO list
+ * @inode: inode to be moved
+ * @wb: target bdi_writeback
+ * @head: one of @wb->b_{dirty|io|more_io}
+ *
+ * Move @inode->i_wb_list to @list of @wb and set %WB_has_dirty_io.
+ * Returns %true if @inode is the first occupant of the !dirty_time IO
+ * lists; otherwise, %false.
+ */
+static bool inode_wb_list_move_locked(struct inode *inode,
+ struct bdi_writeback *wb,
+ struct list_head *head)
+{
+ assert_spin_locked(&wb->list_lock);
+
+ list_move(&inode->i_wb_list, head);
+
+ /* dirty_time doesn't count as dirty_io until expiration */
+ if (head != &wb->b_dirty_time)
+ return wb_io_lists_populated(wb);
+
+ wb_io_lists_depopulated(wb);
+ return false;
+}
+
+/**
+ * inode_wb_list_del_locked - remove an inode from its bdi_writeback IO list
+ * @inode: inode to be removed
+ * @wb: bdi_writeback @inode is being removed from
+ *
+ * Remove @inode which may be on one of @wb->b_{dirty|io|more_io} lists and
+ * clear %WB_has_dirty_io if all are empty afterwards.
+ */
+static void inode_wb_list_del_locked(struct inode *inode,
+ struct bdi_writeback *wb)
+{
+ assert_spin_locked(&wb->list_lock);
+
+ list_del_init(&inode->i_wb_list);
+ wb_io_lists_depopulated(wb);
+}
+