DEBUG_bytes
DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal");
DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal");
DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data");
DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i);