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