Seastar
High performance C++ framework for concurrent servers
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iovec_utils.hh
1/*
2 * This file is open source software, licensed to you under the terms
3 * of the Apache License, Version 2.0 (the "License"). See the NOTICE file
4 * distributed with this work for additional information regarding copyright
5 * ownership. You may not use this file except in compliance with the License.
6 *
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing,
12 * software distributed under the License is distributed on an
13 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14 * KIND, either express or implied. See the License for the
15 * specific language governing permissions and limitations
16 * under the License.
17 */
18/*
19 * Copyright (C) 2022 ScyllaDB.
20 */
21
22#ifndef SEASTAR_MODULE
23#include <sys/types.h>
24#endif
25
26#pragma once
27
28namespace seastar {
29namespace internal {
30
31inline size_t iovec_len(const iovec* begin, size_t len)
32{
33 size_t ret = 0;
34 auto end = begin + len;
35 while (begin != end) {
36 ret += begin++->iov_len;
37 }
38 return ret;
39}
40
41inline size_t iovec_len(const std::vector<iovec>& iov)
42{
43 size_t ret = 0;
44 for (auto&& e : iov) {
45 ret += e.iov_len;
46 }
47 return ret;
48}
49
50// Given a properly aligned vector of iovecs, ensures that it respects the
51// IOV_MAX limit, by trimming if necessary. The modified vector still satisfied
52// the alignment requirements.
53// Returns the final total length of all iovecs.
54size_t sanitize_iovecs(std::vector<iovec>& iov, size_t disk_alignment) noexcept;
55
56} // internal namespace
57} // seastar namespace
Seastar API namespace.
Definition: abort_on_ebadf.hh:26