Documentation/filesystems/fscrypt.rst

661   `FS_IOC_ADD_ENCRYPTION_KEY`_.  Then, the ``key_spec.u.identifier``
836             struct fscrypt_key_specifier key_spec;
866   ``key_spec.type`` must contain FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR, and
867   ``key_spec.u.descriptor`` must contain the descriptor of the key
874   policies, then ``key_spec.type`` must contain
875   FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER, and ``key_spec.u.identifier`` is
890   the raw key and whose ``type`` field matches ``key_spec.type``.
1016             struct fscrypt_key_specifier key_spec;
1025 - The key to remove is specified by ``key_spec``:
1028       ``key_spec.type`` to FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR and fill
1029       in ``key_spec.u.descriptor``.  To remove this type of key, the
1034       ``key_spec.type`` to FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER and fill
1035       in ``key_spec.u.identifier``.
1113             struct fscrypt_key_specifier key_spec;
1127 The caller must zero all input fields, then fill in ``key_spec``:
1130       ``key_spec.type`` to FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR and fill
1131       in ``key_spec.u.descriptor``.
1134       ``key_spec.type`` to FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER and fill
1135       in ``key_spec.u.identifier``.