static void qcow2_invalidate_cache(BlockDriverState *bs, Error **errp)
{
    BDRVQcowState *s = bs->opaque;
    int flags = s->flags;
    AES_KEY aes_encrypt_key;
    AES_KEY aes_decrypt_key;
    uint32_t crypt_method = 0;
    QDict *options;
    Error *local_err = NULL;
    int ret;

    /*
     * Backing files are read-only which makes all of their metadata immutable,
     * that means we don't have to worry about reopening them here.
     */

    if (s->crypt_method) {
        crypt_method = s->crypt_method;
        memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key));
        memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key));
    }

    qcow2_close(bs);

    bdrv_invalidate_cache(bs->file, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return;
    }

    memset(s, 0, sizeof(BDRVQcowState));
    options = qdict_clone_shallow(bs->options);

    ret = qcow2_open(bs, options, flags, &local_err);
    if (local_err) {
        error_setg(errp, "Could not reopen qcow2 layer: %s",
                   error_get_pretty(local_err));
        error_free(local_err);
        return;
    } else if (ret < 0) {
        error_setg_errno(errp, -ret, "Could not reopen qcow2 layer");
        return;
    }

    QDECREF(options);

    if (crypt_method) {
        s->crypt_method = crypt_method;
        memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key));
        memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key));
    }
}
Unknown