fscrypt_find_master_key
fscrypt_find_master_key(struct super_block *sb,
mk = fscrypt_find_master_key(sb, &arg.key_spec);
mk = fscrypt_find_master_key(sb, &arg.key_spec);
mk = fscrypt_find_master_key(sb, mk_spec);
mk = fscrypt_find_master_key(sb, &mk_spec);
mk = fscrypt_find_master_key(sb, &mk_spec);
mk = fscrypt_find_master_key(sb, &mk_spec);