2 * Copyright (C) 2012 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
29 #include <sys/types.h>
31 #include <sys/types.h>
33 #include <sys/mount.h>
36 #include <linux/kdev_t.h>
38 #define LOG_TAG "Vold"
39 #include <private/android_filesystem_config.h>
40 #include <android-base/logging.h>
41 #include <android-base/stringprintf.h>
42 #include <cutils/log.h>
43 #include <cutils/properties.h>
44 #include <logwrap/logwrap.h>
45 #include <selinux/selinux.h>
51 using android::base::StringPrintf;
57 static const char* kResizefsPath = "/system/bin/resize2fs";
58 #ifdef TARGET_USES_MKE2FS
59 static const char* kMkfsPath = "/system/bin/mke2fs";
61 static const char* kMkfsPath = "/system/bin/make_ext4fs";
63 static const char* kFsckPath = "/system/bin/e2fsck";
66 return access(kMkfsPath, X_OK) == 0
67 && access(kFsckPath, X_OK) == 0
68 && IsFilesystemSupported("ext4");
71 status_t Check(const std::string& source, const std::string& target, bool trusted) {
72 // The following is shamelessly borrowed from fs_mgr.c, so it should be
73 // kept in sync with any changes over there.
75 const char* c_source = source.c_str();
76 const char* c_target = target.c_str();
80 long tmpmnt_flags = MS_NOATIME | MS_NOEXEC | MS_NOSUID;
81 char *tmpmnt_opts = (char*) "nomblk_io_submit,errors=remount-ro";
84 * First try to mount and unmount the filesystem. We do this because
85 * the kernel is more efficient than e2fsck in running the journal and
86 * processing orphaned inodes, and on at least one device with a
87 * performance issue in the emmc firmware, it can take e2fsck 2.5 minutes
88 * to do what the kernel does in about a second.
90 * After mounting and unmounting the filesystem, run e2fsck, and if an
91 * error is recorded in the filesystem superblock, e2fsck will do a full
92 * check. Otherwise, it does nothing. If the kernel cannot mount the
93 * filesytsem due to an error, e2fsck is still run to do a full check
96 ret = mount(c_source, c_target, "ext4", tmpmnt_flags, tmpmnt_opts);
99 for (i = 0; i < 5; i++) {
100 // Try to umount 5 times before continuing on.
101 // Should we try rebooting if all attempts fail?
102 int result = umount(c_target);
106 ALOGW("%s(): umount(%s)=%d: %s\n", __func__, c_target, result, strerror(errno));
112 * Some system images do not have e2fsck for licensing reasons
113 * (e.g. recent SDK system images). Detect these and skip the check.
115 if (access(kFsckPath, X_OK)) {
116 ALOGD("Not running %s on %s (executable not in system image)\n",
117 kFsckPath, c_source);
119 ALOGD("Running %s on %s\n", kFsckPath, c_source);
121 std::vector<std::string> cmd;
122 cmd.push_back(kFsckPath);
124 cmd.push_back(c_source);
126 return ForkExecvp(cmd, trusted ? sFsckContext : sFsckUntrustedContext);
132 status_t Mount(const std::string& source, const std::string& target, bool ro,
133 bool remount, bool executable, const std::string& opts /* = "" */, bool portable) {
137 std::string data(opts);
144 data += "context=u:object_r:sdcard_posix:s0";
147 const char* c_source = source.c_str();
148 const char* c_target = target.c_str();
149 const char* c_data = data.c_str();
151 flags = MS_NOATIME | MS_NODEV | MS_NOSUID | MS_DIRSYNC;
153 flags |= (executable ? 0 : MS_NOEXEC);
154 flags |= (ro ? MS_RDONLY : 0);
155 flags |= (remount ? MS_REMOUNT : 0);
157 rc = mount(c_source, c_target, "ext4", flags, c_data);
158 if (portable && rc == 0) {
159 chown(c_target, AID_MEDIA_RW, AID_MEDIA_RW);
160 chmod(c_target, 0755);
163 if (rc && errno == EROFS) {
164 SLOGE("%s appears to be a read only filesystem - retrying mount RO", c_source);
166 rc = mount(c_source, c_target, "ext4", flags, c_data);
172 status_t Resize(const std::string& source, unsigned long numSectors) {
173 std::vector<std::string> cmd;
174 cmd.push_back(kResizefsPath);
176 cmd.push_back(source);
177 cmd.push_back(StringPrintf("%lu", numSectors));
179 return ForkExecvp(cmd);
182 status_t Format(const std::string& source, unsigned long numSectors,
183 const std::string& target) {
184 std::vector<std::string> cmd;
185 cmd.push_back(kMkfsPath);
187 #ifdef TARGET_USES_MKE2FS
189 cmd.push_back("4096");
192 cmd.push_back("ext4");
195 cmd.push_back(target);
198 cmd.push_back("^has_journal");
200 cmd.push_back(source);
203 cmd.push_back(StringPrintf("%lu", numSectors * (4096 / 512)));
208 cmd.push_back(target);
212 cmd.push_back(StringPrintf("%lu", numSectors * 512));
215 // Always generate a real UUID
217 cmd.push_back(source);
220 return ForkExecvp(cmd);
225 } // namespace android