BTRFS_ROOT_DEAD_RELOC_TREE
WARN_ON(test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state));
clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state);
clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE,
if (test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state))
set_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state);