UNIONFS_COPY_IN_PROGRESS
unionfs_clear_in_progress_flag(vp, UNIONFS_COPY_IN_PROGRESS);
error = unionfs_set_in_progress_flag(vp, UNIONFS_COPY_IN_PROGRESS);
unionfs_clear_in_progress_flag(vp, UNIONFS_COPY_IN_PROGRESS);
error = unionfs_set_in_progress_flag(vp, UNIONFS_COPY_IN_PROGRESS);
unionfs_clear_in_progress_flag(vp, UNIONFS_COPY_IN_PROGRESS);
else if (flag == UNIONFS_COPY_IN_PROGRESS &&
error = unionfs_set_in_progress_flag(vp, UNIONFS_COPY_IN_PROGRESS);