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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed 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.
*/
#ifndef ANDROID_APEXD_APEXD_LOOP_H_
#define ANDROID_APEXD_APEXD_LOOP_H_
#include <android-base/result.h>
#include <android-base/unique_fd.h>
#include <functional>
#include <string>
namespace android {
namespace apex {
namespace loop {
using android::base::unique_fd;
struct LoopbackDeviceUniqueFd {
unique_fd device_fd;
std::string name;
LoopbackDeviceUniqueFd() {}
LoopbackDeviceUniqueFd(unique_fd&& fd, const std::string& name)
: device_fd(std::move(fd)), name(name) {}
LoopbackDeviceUniqueFd(LoopbackDeviceUniqueFd&& fd) noexcept
: device_fd(std::move(fd.device_fd)), name(std::move(fd.name)) {}
LoopbackDeviceUniqueFd& operator=(LoopbackDeviceUniqueFd&& other) noexcept {
MaybeCloseBad();
device_fd = std::move(other.device_fd);
name = std::move(other.name);
return *this;
}
~LoopbackDeviceUniqueFd() { MaybeCloseBad(); }
void MaybeCloseBad();
void CloseGood() { device_fd.reset(-1); }
int Get() { return device_fd.get(); }
};
// Exposed only for testing
android::base::Result<uint32_t> BlockDeviceQueueDepth(
const std::string& file_path);
android::base::Result<LoopbackDeviceUniqueFd> WaitForDevice(int num);
android::base::Result<void> ConfigureQueueDepth(
const std::string& loop_device_path, const std::string& file_path);
android::base::Result<void> ConfigureReadAhead(const std::string& device_path);
android::base::Result<void> PreAllocateLoopDevices(size_t num);
android::base::Result<LoopbackDeviceUniqueFd> CreateAndConfigureLoopDevice(
const std::string& target, uint32_t image_offset, size_t image_size);
using DestroyLoopFn =
std::function<void(const std::string&, const std::string&)>;
void DestroyLoopDevice(const std::string& path, const DestroyLoopFn& extra);
} // namespace loop
} // namespace apex
} // namespace android
#endif // ANDROID_APEXD_APEXD_LOOP_H_
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