1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "F2fs.h"
18 #include "Utils.h"
19
20 #include <android-base/logging.h>
21 #include <android-base/properties.h>
22 #include <android-base/stringprintf.h>
23 #include <logwrap/logwrap.h>
24 #include <fscrypt/fscrypt.h>
25
26 #include <string>
27 #include <vector>
28
29 #include <sys/mount.h>
30 #include <filesystem>
31
32 using android::base::StringPrintf;
33
34 namespace android {
35 namespace vold {
36 namespace f2fs {
37
38 static const char* kMkfsPath = "/system/bin/make_f2fs";
39 static const char* kFsckPath = "/system/bin/fsck.f2fs";
40
IsSupported()41 bool IsSupported() {
42 return access(kMkfsPath, X_OK) == 0 && access(kFsckPath, X_OK) == 0 &&
43 IsFilesystemSupported("f2fs");
44 }
45
Check(const std::string & source)46 status_t Check(const std::string& source) {
47 std::vector<std::string> cmd;
48 cmd.push_back(kFsckPath);
49 cmd.push_back("-a");
50 cmd.push_back(source);
51
52 // f2fs devices are currently always trusted
53 return ForkExecvp(cmd, nullptr, sFsckContext);
54 }
55
Mount(const std::string & source,const std::string & target)56 status_t Mount(const std::string& source, const std::string& target) {
57 const char* c_source = source.c_str();
58 const char* c_target = target.c_str();
59 unsigned long flags = MS_NOATIME | MS_NODEV | MS_NOSUID | MS_DIRSYNC;
60
61 int res = mount(c_source, c_target, "f2fs", flags, NULL);
62 if (res != 0) {
63 PLOG(ERROR) << "Failed to mount " << source;
64 if (errno == EROFS) {
65 res = mount(c_source, c_target, "f2fs", flags | MS_RDONLY, NULL);
66 if (res != 0) {
67 PLOG(ERROR) << "Failed to mount read-only " << source;
68 }
69 }
70 }
71
72 return res;
73 }
74
Format(const std::string & source,bool is_zoned,const std::vector<std::string> & user_devices,const std::vector<bool> & device_aliased,int64_t length)75 status_t Format(const std::string& source, bool is_zoned,
76 const std::vector<std::string>& user_devices,
77 const std::vector<bool>& device_aliased, int64_t length) {
78 std::vector<std::string> cmd;
79 /* '-g android' parameter passed here which defaults the sector size to 4096 */
80 static constexpr int kSectorSize = 4096;
81 cmd.emplace_back(kMkfsPath);
82
83 cmd.emplace_back("-f");
84 cmd.emplace_back("-d1");
85
86 cmd.emplace_back("-g");
87 cmd.emplace_back("android");
88
89 if (android::base::GetBoolProperty("vold.has_compress", false)) {
90 cmd.emplace_back("-O");
91 cmd.emplace_back("compression");
92 cmd.emplace_back("-O");
93 cmd.emplace_back("extra_attr");
94 }
95
96 const bool needs_casefold =
97 android::base::GetBoolProperty("external_storage.casefold.enabled", false);
98 if (needs_casefold) {
99 cmd.emplace_back("-O");
100 cmd.emplace_back("casefold");
101 cmd.emplace_back("-C");
102 cmd.emplace_back("utf8");
103 }
104 if (is_zoned) {
105 cmd.emplace_back("-m");
106 }
107 for (size_t i = 0; i < user_devices.size(); i++) {
108 std::string device_name = user_devices[i];
109
110 cmd.emplace_back("-c");
111 if (device_aliased[i]) {
112 std::filesystem::path path = device_name;
113 device_name += "@" + path.filename().string();
114 }
115 cmd.emplace_back(device_name);
116 }
117 cmd.emplace_back("-b");
118 cmd.emplace_back(std::to_string(getpagesize()));
119
120 cmd.emplace_back(source.c_str());
121
122 if (length) {
123 cmd.emplace_back(std::to_string(length / kSectorSize));
124 }
125
126 std::vector<char const*> cmd_cstrs;
127 for (auto& arg : cmd) {
128 cmd_cstrs.emplace_back(arg.c_str());
129 }
130 return logwrap_fork_execvp(cmd_cstrs.size(), cmd_cstrs.data(), nullptr, false, LOG_KLOG, false,
131 nullptr);
132 }
133
134 } // namespace f2fs
135 } // namespace vold
136 } // namespace android
137