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#include "partition_utils.h"
17
18#include <cstdio>
19#include <vector>
20#include <linux/fs.h>
21#include <sys/ioctl.h>
22#include <sys/mount.h>
23#include <sys/types.h>
24#include <sys/stat.h>
25#include <fcntl.h>
26
27#include "log/log.h"
28#include "utils.h"
29
30namespace Updater {
31namespace Utils {
32uint64_t PartitionUtils::GetBlockDeviceSize(int fd) const
33{
34    uint64_t size = 0;
35    return (ioctl(fd, BLKGETSIZE64, &size) == 0) ? size : 0;
36}
37
38int PartitionUtils::WipeBlockPartition() const
39{
40    auto fd = open(Updater::Utils::GetPartitionRealPath(devName_).c_str(), O_RDWR);
41    if (fd < 0) {
42        LOG(ERROR) << "open partition "<<  devName_.c_str() << " fail, error = " << errno;
43        return -1;
44    }
45
46    uint64_t size = GetBlockDeviceSize(fd);
47    uint64_t range[2] = { 0, size };
48    if (ioctl(fd, BLKSECDISCARD, &range) >= 0) {
49        close(fd);
50        return 0;
51    }
52
53    range[0] = 0;
54    range[1] = size;
55    if (ioctl(fd, BLKDISCARD, &range) < 0) {
56        close(fd);
57        LOG(ERROR) << "BLKDISCARD fail";
58        return -1;
59    }
60    std::vector<uint8_t> buffer(BLOCK_SIZE, 0);
61    if (!Updater::Utils::WriteFully(fd, buffer.data(), buffer.size())) {
62        close(fd);
63        LOG(ERROR) << "wipe block partition write fully fail";
64        return -1;
65    }
66    fsync(fd);
67    close(fd);
68    return 0;
69}
70}
71}