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 <stdio.h>
18 #include <unistd.h>
19 #include <sys/types.h>
20 #include <sys/stat.h>
21 #include <fcntl.h>
22 #include <sys/wait.h>
23 #include <errno.h>
24 #include <cutils/partition_utils.h>
25 #include <sys/mount.h>
26
27 #include <android-base/properties.h>
28 #include <android-base/unique_fd.h>
29 #include <ext4_utils/ext4.h>
30 #include <ext4_utils/ext4_utils.h>
31 #include <logwrap/logwrap.h>
32 #include <selinux/android.h>
33 #include <selinux/label.h>
34 #include <selinux/selinux.h>
35 #include <filesystem>
36 #include <string>
37
38 #include "fs_mgr_priv.h"
39
40 using android::base::unique_fd;
41
42 // Realistically, this file should be part of the android::fs_mgr namespace;
43 using namespace android::fs_mgr;
44
get_dev_sz(const std::string & fs_blkdev,uint64_t * dev_sz)45 static int get_dev_sz(const std::string& fs_blkdev, uint64_t* dev_sz) {
46 unique_fd fd(TEMP_FAILURE_RETRY(open(fs_blkdev.c_str(), O_RDONLY | O_CLOEXEC)));
47
48 if (fd < 0) {
49 PERROR << "Cannot open block device";
50 return -1;
51 }
52
53 if ((ioctl(fd, BLKGETSIZE64, dev_sz)) == -1) {
54 PERROR << "Cannot get block device size";
55 return -1;
56 }
57
58 return 0;
59 }
60
format_ext4(const std::string & fs_blkdev,const std::string & fs_mnt_point,bool needs_projid,bool needs_metadata_csum)61 static int format_ext4(const std::string& fs_blkdev, const std::string& fs_mnt_point,
62 bool needs_projid, bool needs_metadata_csum) {
63 uint64_t dev_sz;
64 int rc = 0;
65
66 rc = get_dev_sz(fs_blkdev, &dev_sz);
67 if (rc) {
68 return rc;
69 }
70
71 /* Format the partition using the calculated length */
72
73 // EXT4 supports 4K block size on 16K page sizes. A 4K block
74 // size formatted EXT4 partition will mount fine on both 4K and 16K page
75 // size kernels.
76 // However, EXT4 does not support 16K block size on 4K systems.
77 // If we want the same userspace code to work on both 4k/16k kernels,
78 // using a hardcoded 4096 block size is a simple solution. Using
79 // getpagesize() here would work as well, but 4096 is simpler.
80 std::string size_str = std::to_string(dev_sz / 4096);
81
82 std::vector<const char*> mke2fs_args = {"/system/bin/mke2fs", "-t", "ext4", "-b", "4096"};
83
84 // Project ID's require wider inodes. The Quotas themselves are enabled by tune2fs during boot.
85 if (needs_projid) {
86 mke2fs_args.push_back("-I");
87 mke2fs_args.push_back("512");
88 }
89 // casefolding is enabled via tune2fs during boot.
90
91 if (needs_metadata_csum) {
92 mke2fs_args.push_back("-O");
93 mke2fs_args.push_back("metadata_csum");
94 // tune2fs recommends to enable 64bit and extent:
95 // Extents are not enabled. The file extent tree can be checksummed,
96 // whereas block maps cannot. Not enabling extents reduces the coverage
97 // of metadata checksumming. Re-run with -O extent to rectify.
98 // 64-bit filesystem support is not enabled. The larger fields afforded
99 // by this feature enable full-strength checksumming. Run resize2fs -b to rectify.
100 mke2fs_args.push_back("-O");
101 mke2fs_args.push_back("64bit");
102 mke2fs_args.push_back("-O");
103 mke2fs_args.push_back("extent");
104 }
105
106 mke2fs_args.push_back(fs_blkdev.c_str());
107 mke2fs_args.push_back(size_str.c_str());
108
109 rc = logwrap_fork_execvp(mke2fs_args.size(), mke2fs_args.data(), nullptr, false, LOG_KLOG,
110 false, nullptr);
111 if (rc) {
112 LERROR << "mke2fs returned " << rc;
113 return rc;
114 }
115
116 const char* const e2fsdroid_args[] = {
117 "/system/bin/e2fsdroid", "-e", "-a", fs_mnt_point.c_str(), fs_blkdev.c_str(), nullptr};
118
119 rc = logwrap_fork_execvp(arraysize(e2fsdroid_args), e2fsdroid_args, nullptr, false, LOG_KLOG,
120 false, nullptr);
121 if (rc) {
122 LERROR << "e2fsdroid returned " << rc;
123 }
124
125 return rc;
126 }
127
format_f2fs(const std::string & fs_blkdev,uint64_t dev_sz,bool needs_projid,bool needs_casefold,bool fs_compress,bool is_zoned,const std::vector<std::string> & user_devices,const std::vector<int> & device_aliased)128 static int format_f2fs(const std::string& fs_blkdev, uint64_t dev_sz, bool needs_projid,
129 bool needs_casefold, bool fs_compress, bool is_zoned,
130 const std::vector<std::string>& user_devices,
131 const std::vector<int>& device_aliased) {
132 if (!dev_sz) {
133 int rc = get_dev_sz(fs_blkdev, &dev_sz);
134 if (rc) {
135 return rc;
136 }
137 }
138
139 /* Format the partition using the calculated length */
140
141 const auto size_str = std::to_string(dev_sz / getpagesize());
142 std::string block_size = std::to_string(getpagesize());
143
144 std::vector<const char*> args = {"/system/bin/make_f2fs", "-g", "android"};
145 if (needs_projid) {
146 args.push_back("-O");
147 args.push_back("project_quota,extra_attr");
148 }
149 if (needs_casefold) {
150 args.push_back("-O");
151 args.push_back("casefold");
152 args.push_back("-C");
153 args.push_back("utf8");
154 }
155 if (fs_compress) {
156 args.push_back("-O");
157 args.push_back("compression");
158 args.push_back("-O");
159 args.push_back("extra_attr");
160 }
161 args.push_back("-w");
162 args.push_back(block_size.c_str());
163 args.push_back("-b");
164 args.push_back(block_size.c_str());
165
166 if (is_zoned) {
167 args.push_back("-m");
168 }
169 for (size_t i = 0; i < user_devices.size(); i++) {
170 std::string device_name = user_devices[i];
171
172 args.push_back("-c");
173 if (device_aliased[i]) {
174 std::filesystem::path path = device_name;
175 device_name += "@" + path.filename().string();
176 }
177 args.push_back(device_name.c_str());
178 }
179
180 if (user_devices.empty()) {
181 args.push_back(fs_blkdev.c_str());
182 args.push_back(size_str.c_str());
183 } else {
184 args.push_back(fs_blkdev.c_str());
185 }
186 return logwrap_fork_execvp(args.size(), args.data(), nullptr, false, LOG_KLOG, false, nullptr);
187 }
188
fs_mgr_do_format(const FstabEntry & entry)189 int fs_mgr_do_format(const FstabEntry& entry) {
190 LERROR << __FUNCTION__ << ": Format " << entry.blk_device << " as '" << entry.fs_type << "'";
191
192 bool needs_casefold = false;
193 bool needs_projid = true;
194
195 if (entry.mount_point == "/data") {
196 needs_casefold = android::base::GetBoolProperty("external_storage.casefold.enabled", false);
197 }
198
199 if (entry.fs_type == "f2fs") {
200 return format_f2fs(entry.blk_device, entry.length, needs_projid, needs_casefold,
201 entry.fs_mgr_flags.fs_compress, entry.fs_mgr_flags.is_zoned,
202 entry.user_devices, entry.device_aliased);
203 } else if (entry.fs_type == "ext4") {
204 return format_ext4(entry.blk_device, entry.mount_point, needs_projid,
205 entry.fs_mgr_flags.ext_meta_csum);
206 } else {
207 LERROR << "File system type '" << entry.fs_type << "' is not supported";
208 return -EINVAL;
209 }
210 }
211