1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*
* 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.
*/
#include "fsck_unshare_blocks.h"
#include <errno.h>
#include <fcntl.h>
#include <spawn.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <algorithm>
#include <memory>
#include <string>
#include <vector>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/unique_fd.h>
#include <fstab/fstab.h>
#include "roots.h"
static constexpr const char* SYSTEM_E2FSCK_BIN = "/system/bin/e2fsck_static";
static constexpr const char* TMP_E2FSCK_BIN = "/tmp/e2fsck.bin";
static bool copy_file(const char* source, const char* dest) {
android::base::unique_fd source_fd(open(source, O_RDONLY));
if (source_fd < 0) {
PLOG(ERROR) << "open %s failed" << source;
return false;
}
android::base::unique_fd dest_fd(open(dest, O_CREAT | O_WRONLY, S_IRWXU));
if (dest_fd < 0) {
PLOG(ERROR) << "open %s failed" << dest;
return false;
}
for (;;) {
char buf[4096];
ssize_t rv = read(source_fd, buf, sizeof(buf));
if (rv < 0) {
PLOG(ERROR) << "read failed";
return false;
}
if (rv == 0) {
break;
}
if (write(dest_fd, buf, rv) != rv) {
PLOG(ERROR) << "write failed";
return false;
}
}
return true;
}
static bool run_e2fsck(const std::string& partition) {
Volume* volume = volume_for_mount_point(partition);
if (!volume) {
LOG(INFO) << "No fstab entry for " << partition << ", skipping.";
return true;
}
LOG(INFO) << "Running e2fsck on device " << volume->blk_device;
std::vector<std::string> args = { TMP_E2FSCK_BIN, "-p", "-E", "unshare_blocks",
volume->blk_device };
std::vector<char*> argv(args.size());
std::transform(args.cbegin(), args.cend(), argv.begin(),
[](const std::string& arg) { return const_cast<char*>(arg.c_str()); });
argv.push_back(nullptr);
pid_t child;
char* env[] = { nullptr };
if (posix_spawn(&child, argv[0], nullptr, nullptr, argv.data(), env)) {
PLOG(ERROR) << "posix_spawn failed";
return false;
}
int status = 0;
int ret = TEMP_FAILURE_RETRY(waitpid(child, &status, 0));
if (ret < 0) {
PLOG(ERROR) << "waitpid failed";
return false;
}
if (!WIFEXITED(status)) {
LOG(ERROR) << "e2fsck exited abnormally: " << status;
return false;
}
int return_code = WEXITSTATUS(status);
if (return_code >= 8) {
LOG(ERROR) << "e2fsck could not unshare blocks: " << return_code;
return false;
}
LOG(INFO) << "Successfully unshared blocks on " << partition;
return true;
}
static const char* get_system_root() {
if (android::base::GetBoolProperty("ro.build.system_root_image", false)) {
return "/system_root";
} else {
return "/system";
}
}
bool do_fsck_unshare_blocks() {
// List of partitions we will try to e2fsck -E unshare_blocks.
std::vector<std::string> partitions = { "/odm", "/oem", "/product", "/vendor" };
// Temporarily mount system so we can copy e2fsck_static.
bool mounted = false;
if (android::base::GetBoolProperty("ro.build.system_root_image", false)) {
mounted = ensure_path_mounted_at("/", "/system_root") != -1;
partitions.push_back("/");
} else {
mounted = ensure_path_mounted("/system") != -1;
partitions.push_back("/system");
}
if (!mounted) {
LOG(ERROR) << "Failed to mount system image.";
return false;
}
if (!copy_file(SYSTEM_E2FSCK_BIN, TMP_E2FSCK_BIN)) {
LOG(ERROR) << "Could not copy e2fsck to /tmp.";
return false;
}
if (umount(get_system_root()) < 0) {
PLOG(ERROR) << "umount failed";
return false;
}
bool ok = true;
for (const auto& partition : partitions) {
ok &= run_e2fsck(partition);
}
if (ok) {
LOG(INFO) << "Finished running e2fsck.";
} else {
LOG(ERROR) << "Finished running e2fsck, but not all partitions succceeded.";
}
return ok;
}
|
