| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| **/ |
| |
| #include "tmb/internal/log_writer_posix.h" |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <limits.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/uio.h> |
| #include <unistd.h> |
| |
| #include <cassert> |
| #include <cstddef> |
| #include <cstdint> |
| #include <initializer_list> |
| #include <mutex> // NOLINT(build/c++11) |
| #include <string> |
| #include <utility> |
| |
| #include "tmb/internal/crc32.h" |
| #include "tmb/internal/log_record_header.h" |
| #include "tmb/internal/logging_constants.h" |
| |
| namespace { |
| |
| inline bool SyncFD(const int fd) { |
| #if defined(TMB_POSIX_FDATASYNC_SUPPORTED) |
| return (fdatasync(fd) == 0); |
| #elif defined(TMB_DARWIN_FFULLFSYNC_SUPPORTED) |
| return (fcntl(fd, F_FULLFSYNC) != -1); |
| #else |
| return (fsync(fd) == 0); |
| #endif |
| } |
| |
| } // namespace |
| |
| namespace tmb { |
| namespace internal { |
| |
| bool LogWriterPosix::OpenReset() { |
| fd_ = open(filename_.c_str(), |
| O_WRONLY | O_CREAT | O_TRUNC, |
| S_IRUSR | S_IWUSR); |
| write_allocation_.store(0, std::memory_order_relaxed); |
| file_size_.store(0, std::memory_order_relaxed); |
| return (fd_ >= 0); |
| } |
| |
| bool LogWriterPosix::OpenAtPosition(const std::size_t offset) { |
| fd_ = open(filename_.c_str(), |
| O_WRONLY, |
| S_IRUSR | S_IWUSR); |
| if (fd_ < 0) { |
| return false; |
| } |
| |
| // Determine file's size. |
| const off_t end_pos = lseek(fd_, 0, SEEK_END); |
| if (end_pos == static_cast<off_t>(-1)) { |
| return false; |
| } |
| |
| if (end_pos < static_cast<off_t>(offset)) { |
| // Desired offset is beyond the end of the file. |
| return false; |
| } |
| file_size_.store(end_pos, std::memory_order_relaxed); |
| |
| const off_t set_pos = lseek(fd_, offset, SEEK_SET); |
| if (set_pos != static_cast<off_t>(offset)) { |
| return false; |
| } |
| write_allocation_.store(offset, std::memory_order_relaxed); |
| |
| return true; |
| } |
| |
| bool LogWriterPosix::Close() { |
| if (!IsOpen()) { |
| return true; |
| } |
| |
| const int status = close(fd_); |
| fd_ = -1; |
| return (status == 0); |
| } |
| |
| bool LogWriterPosix::WriteRecord(const void *data, |
| const std::size_t length, |
| const bool sync) { |
| assert(IsOpen()); |
| assert(data != nullptr); |
| assert(length != 0); |
| |
| if (length > kMaxLogRecordSize) { |
| return false; |
| } |
| |
| LogRecordHeader header; |
| header.length = length; |
| header.crc32 = ComputeCrc32(data, length); |
| |
| struct iovec segments[2]; |
| segments[0].iov_base = &header; |
| segments[0].iov_len = sizeof(header); |
| segments[1].iov_base = const_cast<void*>(data); |
| segments[1].iov_len = length; |
| |
| if (!GrowFileIfNeeded(sizeof(header) + length)) { |
| return false; |
| } |
| |
| ssize_t written = writev(fd_, segments, 2); |
| if (written != static_cast<ssize_t>(sizeof(header) + length)) { |
| return false; |
| } |
| |
| if (sync) { |
| return SyncFD(fd_); |
| } |
| |
| return true; |
| } |
| |
| bool LogWriterPosix::WriteMultipartRecord( |
| std::initializer_list<std::pair<const void*, std::size_t>> parts, |
| const bool sync) { |
| assert(IsOpen()); |
| |
| if (parts.size() + 1 > IOV_MAX) { |
| // Too many segments. |
| return false; |
| } |
| |
| LogRecordHeader header; |
| header.length = 0; |
| header.crc32 = kInitialCrc32; |
| |
| struct iovec *segments = new struct iovec[parts.size() + 1]; |
| segments[0].iov_base = &header; |
| segments[0].iov_len = sizeof(header); |
| |
| std::initializer_list<std::pair<const void*, std::size_t>>::const_iterator |
| it = parts.begin(); |
| for (std::size_t part_idx = 0; |
| part_idx < parts.size(); |
| ++part_idx, ++it) { |
| const std::pair<const void*, std::size_t> &part = *it;; |
| assert(part.first != nullptr); |
| assert(part.second != 0); |
| |
| header.length += part.second; |
| header.crc32 = UpdateCrc32(header.crc32, part.first, part.second); |
| |
| segments[part_idx + 1].iov_base = const_cast<void*>(part.first); |
| segments[part_idx + 1].iov_len = part.second; |
| } |
| header.crc32 = FinalizeCrc32(header.crc32); |
| |
| if (header.length > kMaxLogRecordSize) { |
| delete[] segments; |
| return false; |
| } |
| |
| if (!GrowFileIfNeeded(sizeof(header) + header.length)) { |
| delete[] segments; |
| return false; |
| } |
| |
| ssize_t written = writev(fd_, segments, parts.size() + 1); |
| delete[] segments; |
| |
| if (written != static_cast<ssize_t>(sizeof(header) + header.length)) { |
| return false; |
| } |
| |
| if (sync) { |
| return SyncFD(fd_); |
| } |
| |
| return true; |
| } |
| |
| bool LogWriterPosix::Sync() { |
| return SyncFD(fd_); |
| } |
| |
| bool LogWriterPosix::GrowFileIfNeeded(const std::size_t write_size) { |
| const std::size_t write_end |
| = write_allocation_.fetch_add(write_size, std::memory_order_relaxed) |
| + write_size; |
| if (write_end > file_size_.load(std::memory_order_relaxed)) { |
| std::lock_guard<std::mutex> lock(resize_mutex_); |
| std::size_t original_file_size = file_size_.load( |
| std::memory_order_relaxed); |
| if (write_end > original_file_size) { |
| std::size_t new_file_size = ((write_end / kLogSegmentSize) + 1) |
| * kLogSegmentSize; |
| const int status = ftruncate(fd_, new_file_size); |
| if (status == 0) { |
| file_size_.store(new_file_size, std::memory_order_relaxed); |
| } |
| return (status == 0); |
| } |
| } |
| |
| return true; |
| } |
| |
| } // namespace internal |
| } // namespace tmb |