BTRFS_ROOT_ORPHAN_ITEM_INSERTED
set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state)) {
if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
WARN_ON(!test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state));