BTRFS_DEV_STATE_ITEM_FOUND
set_bit(BTRFS_DEV_STATE_ITEM_FOUND, &device->dev_state);
!test_bit(BTRFS_DEV_STATE_ITEM_FOUND, &dev->dev_state)) {
if (!test_bit(BTRFS_DEV_STATE_ITEM_FOUND, &dev->dev_state)) {