/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_APEXD_APEXD_LOOP_H_
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#define ANDROID_APEXD_APEXD_LOOP_H_
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#include "status_or.h"
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#include <android-base/unique_fd.h>
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#include <functional>
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#include <string>
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namespace android {
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namespace apex {
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namespace loop {
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using android::base::unique_fd;
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struct LoopbackDeviceUniqueFd {
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unique_fd device_fd;
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std::string name;
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LoopbackDeviceUniqueFd() {}
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LoopbackDeviceUniqueFd(unique_fd&& fd, const std::string& name)
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: device_fd(std::move(fd)), name(name) {}
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LoopbackDeviceUniqueFd(LoopbackDeviceUniqueFd&& fd) noexcept
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: device_fd(std::move(fd.device_fd)), name(fd.name) {}
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LoopbackDeviceUniqueFd& operator=(LoopbackDeviceUniqueFd&& other) noexcept {
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MaybeCloseBad();
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device_fd = std::move(other.device_fd);
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name = std::move(other.name);
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return *this;
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}
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~LoopbackDeviceUniqueFd() { MaybeCloseBad(); }
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void MaybeCloseBad();
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void CloseGood() { device_fd.reset(-1); }
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int get() { return device_fd.get(); }
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};
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Status configureReadAhead(const std::string& device_path);
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Status preAllocateLoopDevices(size_t num);
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StatusOr<LoopbackDeviceUniqueFd> createLoopDevice(const std::string& target,
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const int32_t imageOffset,
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const size_t imageSize);
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using DestroyLoopFn =
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std::function<void(const std::string&, const std::string&)>;
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void DestroyLoopDevice(const std::string& path, const DestroyLoopFn& extra);
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} // namespace loop
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} // namespace apex
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} // namespace android
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#endif // ANDROID_APEXD_APEXD_LOOP_H_
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