C++ (Cpp) nfs_idmap_get_desc Examples

Example #1

File: idmap.c Project: 404992361/mi1_kernel

static ssize_t nfs_idmap_request_key(struct key_type *key_type,
				     const char *name, size_t namelen,
				     const char *type, void *data,
				     size_t data_size, struct idmap *idmap)
{
	const struct cred *saved_cred;
	struct key *rkey;
	char *desc;
	struct user_key_payload *payload;
	ssize_t ret;

	ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
	if (ret <= 0)
		goto out;

	saved_cred = override_creds(id_resolver_cache);
	if (idmap)
		rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap);
	else
		rkey = request_key(&key_type_id_resolver, desc, "");
	revert_creds(saved_cred);

	kfree(desc);
	if (IS_ERR(rkey)) {
		ret = PTR_ERR(rkey);
		goto out;
	}

	rcu_read_lock();
	rkey->perm |= KEY_USR_VIEW;

	ret = key_validate(rkey);
	if (ret < 0)
		goto out_up;

	payload = rcu_dereference(rkey->payload.data);
	if (IS_ERR_OR_NULL(payload)) {
		ret = PTR_ERR(payload);
		goto out_up;
	}

	ret = payload->datalen;
	if (ret > 0 && ret <= data_size)
		memcpy(data, payload->data, ret);
	else
		ret = -EINVAL;

out_up:
	rcu_read_unlock();
	key_put(rkey);
out:
	return ret;
}

Example #2

File: nfs4idmap.c Project: Seagate/SMR_FS-EXT4

static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
					 const char *type, struct idmap *idmap)
{
	char *desc;
	struct key *rkey;
	ssize_t ret;

	ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
	if (ret <= 0)
		return ERR_PTR(ret);

	rkey = request_key(&key_type_id_resolver, desc, "");
	if (IS_ERR(rkey)) {
		mutex_lock(&idmap->idmap_mutex);
		rkey = request_key_with_auxdata(&key_type_id_resolver_legacy,
						desc, "", 0, idmap);
		mutex_unlock(&idmap->idmap_mutex);
	}
	if (!IS_ERR(rkey))
		set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags);

	kfree(desc);
	return rkey;
}