1/*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#ifndef SYS_INSTALLER_MODULE_LOOP_H
17#define SYS_INSTALLER_MODULE_LOOP_H
18
19#include <memory>
20#include <string>
21
22#include "unique_fd.h"
23
24namespace OHOS {
25namespace SysInstaller {
26namespace Loop {
27class LoopbackDeviceUniqueFd {
28public:
29    UniqueFd deviceFd;
30    std::string name;
31
32    LoopbackDeviceUniqueFd() {}
33    LoopbackDeviceUniqueFd(UniqueFd &&fd, const std::string &name)
34        : deviceFd(std::move(fd)), name(name) {}
35
36    LoopbackDeviceUniqueFd(LoopbackDeviceUniqueFd &&fd) noexcept
37        : deviceFd(std::move(fd.deviceFd)), name(std::move(fd.name)) {}
38    LoopbackDeviceUniqueFd &operator=(LoopbackDeviceUniqueFd &&other) noexcept
39    {
40        MaybeCloseBad();
41        deviceFd = std::move(other.deviceFd);
42        name = std::move(other.name);
43        return *this;
44    }
45
46    ~LoopbackDeviceUniqueFd()
47    {
48        MaybeCloseBad();
49    }
50
51    void MaybeCloseBad() const;
52
53    void CloseGood()
54    {
55        deviceFd.Release();
56    }
57
58    int Get() const
59    {
60        return deviceFd.Get();
61    }
62};
63bool ConfigureReadAhead(const std::string &devicePath);
64bool PreAllocateLoopDevices(const size_t num);
65std::unique_ptr<LoopbackDeviceUniqueFd> CreateLoopDevice(
66    const std::string &target, const uint32_t imageOffset, const uint32_t imageSize);
67bool RemoveDmLoopDevice(const std::string &mountPoint, const std::string &imagePath);
68bool RemoveDmLoopDevice(const std::string &loopDevPath);
69bool IsLoopDevMatchedImg(const std::string &loopPath, const std::string &imgFilePath);
70bool CloseLoopDev(const std::string &loopPath);
71bool ClearDmLoopDevice(const std::string &loopDevPath, const bool clearDm);
72} // Loop
73} // SysInstaller
74} // namespace OHOS
75#endif // SYS_INSTALLER_MODULE_LOOP_H