taglinefilesource code
LO_KEY_SIZE282drivers/block/loop.cmemset(lo->lo_encrypt_key, 0, LO_KEY_SIZE);
LO_KEY_SIZE298drivers/block/loop.cif (info.lo_encrypt_key_size > LO_KEY_SIZE)
LO_KEY_SIZE28drivers/block/loop.hchar    lo_encrypt_key[LO_KEY_SIZE];
LO_KEY_SIZE53drivers/block/loop.hunsigned char  lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */