LOOKUP_NODE_RA
mode = LOOKUP_NODE_RA;
ret = f2fs_get_dnode_of_data(&dn, off, LOOKUP_NODE_RA);
ret = f2fs_get_dnode_of_data(&dn, off + i, LOOKUP_NODE_RA);
err = f2fs_get_dnode_of_data(&dn, free_from, LOOKUP_NODE_RA);
} else if (mode == LOOKUP_NODE_RA && i == level && level > 1) {
ret = f2fs_get_dnode_of_data(&dn, off, LOOKUP_NODE_RA);