2 * Copyright (C) 2015 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.
19 #include "PrivateVolume.h"
20 #include "EmulatedVolume.h"
22 #include "VolumeManager.h"
23 #include "ResponseCode.h"
26 #include <android-base/stringprintf.h>
27 #include <android-base/logging.h>
28 #include <cutils/fs.h>
29 #include <private/android_filesystem_config.h>
33 #include <sys/mount.h>
35 #include <sys/types.h>
36 #include <sys/sysmacros.h>
38 #include <sys/param.h>
40 using android::base::StringPrintf;
45 PrivateVolume::PrivateVolume(dev_t device, const std::string& keyRaw) :
46 VolumeBase(Type::kPrivate), mRawDevice(device), mKeyRaw(keyRaw) {
47 setId(StringPrintf("private:%u,%u", major(device), minor(device)));
48 mRawDevPath = StringPrintf("/dev/block/vold/%s", getId().c_str());
51 PrivateVolume::~PrivateVolume() {
54 status_t PrivateVolume::readMetadata() {
55 status_t res = ReadMetadata(mDmDevPath, mFsType, mFsUuid, mFsLabel);
56 notifyEvent(ResponseCode::VolumeFsTypeChanged, mFsType);
57 notifyEvent(ResponseCode::VolumeFsUuidChanged, mFsUuid);
58 notifyEvent(ResponseCode::VolumeFsLabelChanged, mFsLabel);
62 status_t PrivateVolume::doCreate() {
63 if (CreateDeviceNode(mRawDevPath, mRawDevice)) {
67 // Recover from stale vold by tearing down any old mappings
68 cryptfs_revert_ext_volume(getId().c_str());
70 // TODO: figure out better SELinux labels for private volumes
72 unsigned char* key = (unsigned char*) mKeyRaw.data();
73 char crypto_blkdev[MAXPATHLEN];
74 int res = cryptfs_setup_ext_volume(getId().c_str(), mRawDevPath.c_str(),
75 key, mKeyRaw.size(), crypto_blkdev);
76 mDmDevPath = crypto_blkdev;
78 PLOG(ERROR) << getId() << " failed to setup cryptfs";
85 status_t PrivateVolume::doDestroy() {
86 if (cryptfs_revert_ext_volume(getId().c_str())) {
87 LOG(ERROR) << getId() << " failed to revert cryptfs";
89 return DestroyDeviceNode(mRawDevPath);
92 status_t PrivateVolume::doMount() {
94 LOG(ERROR) << getId() << " failed to read metadata";
98 mPath = StringPrintf("/mnt/expand/%s", mFsUuid.c_str());
101 if (PrepareDir(mPath, 0700, AID_ROOT, AID_ROOT)) {
102 PLOG(ERROR) << getId() << " failed to create mount point " << mPath;
106 if (mFsType == "ext4") {
107 int res = ext4::Check(mDmDevPath, mPath, true);
108 if (res == 0 || res == 1) {
109 LOG(DEBUG) << getId() << " passed filesystem check";
111 PLOG(ERROR) << getId() << " failed filesystem check";
115 if (ext4::Mount(mDmDevPath, mPath, false, false, true)) {
116 PLOG(ERROR) << getId() << " failed to mount";
120 } else if (mFsType == "f2fs") {
121 int res = f2fs::Check(mDmDevPath, true);
123 LOG(DEBUG) << getId() << " passed filesystem check";
125 PLOG(ERROR) << getId() << " failed filesystem check";
129 if (f2fs::Mount(mDmDevPath, mPath, "")) {
130 PLOG(ERROR) << getId() << " failed to mount";
135 LOG(ERROR) << getId() << " unsupported filesystem " << mFsType;
139 RestoreconRecursive(mPath);
141 // Verify that common directories are ready to roll
142 if (PrepareDir(mPath + "/app", 0771, AID_SYSTEM, AID_SYSTEM) ||
143 PrepareDir(mPath + "/user", 0711, AID_SYSTEM, AID_SYSTEM) ||
144 PrepareDir(mPath + "/user_de", 0711, AID_SYSTEM, AID_SYSTEM) ||
145 PrepareDir(mPath + "/media", 0770, AID_MEDIA_RW, AID_MEDIA_RW) ||
146 PrepareDir(mPath + "/media/0", 0770, AID_MEDIA_RW, AID_MEDIA_RW) ||
147 PrepareDir(mPath + "/local", 0751, AID_ROOT, AID_ROOT) ||
148 PrepareDir(mPath + "/local/tmp", 0771, AID_SHELL, AID_SHELL)) {
149 PLOG(ERROR) << getId() << " failed to prepare";
153 // Create a new emulated volume stacked above us, it will automatically
154 // be destroyed during unmount
155 std::string mediaPath(mPath + "/media");
156 auto vol = std::shared_ptr<VolumeBase>(
157 new EmulatedVolume(mediaPath, mRawDevice, mFsUuid));
164 status_t PrivateVolume::doUnmount() {
167 if (TEMP_FAILURE_RETRY(rmdir(mPath.c_str()))) {
168 PLOG(ERROR) << getId() << " failed to rmdir mount point " << mPath;
174 status_t PrivateVolume::doFormat(const std::string& fsType) {
175 std::string resolvedFsType = fsType;
176 if (fsType == "auto") {
177 // For now, assume that all MMC devices are flash-based SD cards, and
178 // give everyone else ext4 because sysfs rotational isn't reliable.
179 if ((major(mRawDevice) == Disk::kMajorBlockMmc) && f2fs::IsSupported()) {
180 resolvedFsType = "f2fs";
182 resolvedFsType = "ext4";
184 LOG(DEBUG) << "Resolved auto to " << resolvedFsType;
187 if (resolvedFsType == "ext4") {
188 // TODO: change reported mountpoint once we have better selinux support
189 if (ext4::Format(mDmDevPath, 0, "/data")) {
190 PLOG(ERROR) << getId() << " failed to format";
193 } else if (resolvedFsType == "f2fs") {
194 if (f2fs::Format(mDmDevPath)) {
195 PLOG(ERROR) << getId() << " failed to format";
199 LOG(ERROR) << getId() << " unsupported filesystem " << fsType;
207 } // namespace android