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Jeff Sharkeydeb24052015-03-02 21:01:40 -08001/*
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
Jeff Sharkeydeb24052015-03-02 21:01:40 -080017#include "Fat.h"
18#include "PublicVolume.h"
19#include "Utils.h"
Jeff Sharkey36801cc2015-03-13 16:09:20 -070020#include "VolumeManager.h"
21#include "ResponseCode.h"
Jeff Sharkeydeb24052015-03-02 21:01:40 -080022
Dan Albertae9e8902015-03-16 10:35:17 -070023#include <base/stringprintf.h>
Jeff Sharkey36801cc2015-03-13 16:09:20 -070024#include <base/logging.h>
Jeff Sharkeydeb24052015-03-02 21:01:40 -080025#include <cutils/fs.h>
Jeff Sharkeydeb24052015-03-02 21:01:40 -080026#include <private/android_filesystem_config.h>
27
28#include <fcntl.h>
29#include <stdlib.h>
30#include <sys/mount.h>
31#include <sys/stat.h>
32#include <sys/types.h>
33#include <sys/wait.h>
34
Dan Albertae9e8902015-03-16 10:35:17 -070035using android::base::StringPrintf;
36
Jeff Sharkeydeb24052015-03-02 21:01:40 -080037namespace android {
38namespace vold {
39
Jeff Sharkeydeb24052015-03-02 21:01:40 -080040static const char* kFusePath = "/system/bin/sdcard";
41
Jeff Sharkey36801cc2015-03-13 16:09:20 -070042static const char* kAsecPath = "/mnt/secure/asec";
Jeff Sharkeydeb24052015-03-02 21:01:40 -080043
44PublicVolume::PublicVolume(dev_t device) :
Jeff Sharkey36801cc2015-03-13 16:09:20 -070045 VolumeBase(Type::kPublic), mDevice(device), mFusePid(0) {
46 setId(StringPrintf("public:%u,%u", major(device), minor(device)));
47 mDevPath = StringPrintf("/dev/block/vold/%s", getId().c_str());
Jeff Sharkeydeb24052015-03-02 21:01:40 -080048}
49
50PublicVolume::~PublicVolume() {
Jeff Sharkeydeb24052015-03-02 21:01:40 -080051}
52
53status_t PublicVolume::readMetadata() {
Jeff Sharkey95c87cc2015-04-01 11:54:32 -070054 status_t res = ReadMetadataUntrusted(mDevPath, mFsType, mFsUuid, mFsLabel);
Jeff Sharkeyce6a9132015-04-08 21:07:21 -070055 notifyEvent(ResponseCode::VolumeFsTypeChanged, mFsType);
56 notifyEvent(ResponseCode::VolumeFsUuidChanged, mFsUuid);
57 notifyEvent(ResponseCode::VolumeFsLabelChanged, mFsLabel);
Jeff Sharkey36801cc2015-03-13 16:09:20 -070058 return res;
Jeff Sharkeydeb24052015-03-02 21:01:40 -080059}
60
61status_t PublicVolume::initAsecStage() {
62 std::string legacyPath(mRawPath + "/android_secure");
63 std::string securePath(mRawPath + "/.android_secure");
64
65 // Recover legacy secure path
66 if (!access(legacyPath.c_str(), R_OK | X_OK)
67 && access(securePath.c_str(), R_OK | X_OK)) {
68 if (rename(legacyPath.c_str(), securePath.c_str())) {
Jeff Sharkey9c484982015-03-31 10:35:33 -070069 PLOG(WARNING) << getId() << " failed to rename legacy ASEC dir";
Jeff Sharkeydeb24052015-03-02 21:01:40 -080070 }
71 }
72
Jeff Sharkey36801cc2015-03-13 16:09:20 -070073 if (TEMP_FAILURE_RETRY(mkdir(securePath.c_str(), 0700))) {
74 if (errno != EEXIST) {
Jeff Sharkey9c484982015-03-31 10:35:33 -070075 PLOG(WARNING) << getId() << " creating ASEC stage failed";
Jeff Sharkey36801cc2015-03-13 16:09:20 -070076 return -errno;
77 }
Jeff Sharkeydeb24052015-03-02 21:01:40 -080078 }
79
Jeff Sharkey36801cc2015-03-13 16:09:20 -070080 BindMount(securePath, kAsecPath);
81
Jeff Sharkeydeb24052015-03-02 21:01:40 -080082 return OK;
83}
84
Jeff Sharkey9c484982015-03-31 10:35:33 -070085status_t PublicVolume::doCreate() {
86 return CreateDeviceNode(mDevPath, mDevice);
87}
88
89status_t PublicVolume::doDestroy() {
90 return DestroyDeviceNode(mDevPath);
91}
92
Jeff Sharkeydeb24052015-03-02 21:01:40 -080093status_t PublicVolume::doMount() {
Jeff Sharkey36801cc2015-03-13 16:09:20 -070094 // TODO: expand to support mounting other filesystems
Jeff Sharkey9c484982015-03-31 10:35:33 -070095 readMetadata();
96
Jeff Sharkeydeb24052015-03-02 21:01:40 -080097 if (Fat::check(mDevPath.c_str())) {
Jeff Sharkey9c484982015-03-31 10:35:33 -070098 LOG(ERROR) << getId() << " failed filesystem check";
Jeff Sharkeydeb24052015-03-02 21:01:40 -080099 return -EIO;
100 }
101
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700102 // Use UUID as stable name, if available
103 std::string stableName = getId();
104 if (!mFsUuid.empty()) {
Jeff Sharkeyf0121c52015-04-06 14:08:45 -0700105 stableName = mFsUuid;
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700106 }
107
108 mRawPath = StringPrintf("/mnt/media_rw/%s", stableName.c_str());
109 mFusePath = StringPrintf("/storage/%s", stableName.c_str());
110 setPath(mFusePath);
111
112 if (fs_prepare_dir(mRawPath.c_str(), 0700, AID_ROOT, AID_ROOT)) {
Jeff Sharkey9c484982015-03-31 10:35:33 -0700113 PLOG(ERROR) << getId() << " failed to create mount point " << mRawPath;
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800114 return -errno;
115 }
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700116 if (fs_prepare_dir(mFusePath.c_str(), 0700, AID_ROOT, AID_ROOT)) {
Jeff Sharkey9c484982015-03-31 10:35:33 -0700117 PLOG(ERROR) << getId() << " failed to create mount point " << mFusePath;
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800118 return -errno;
119 }
120
121 if (Fat::doMount(mDevPath.c_str(), mRawPath.c_str(), false, false, false,
122 AID_MEDIA_RW, AID_MEDIA_RW, 0007, true)) {
Jeff Sharkey9c484982015-03-31 10:35:33 -0700123 PLOG(ERROR) << getId() << " failed to mount " << mDevPath;
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800124 return -EIO;
125 }
126
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700127 if (getFlags() & Flags::kPrimary) {
128 initAsecStage();
129 }
130
131 // Only need to spin up FUSE when visible
132 if (!(getFlags() & Flags::kVisible)) {
133 return OK;
134 }
135
136 // TODO: teach FUSE daemon to protect itself with user-specific GID
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800137 if (!(mFusePid = fork())) {
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700138 if (getFlags() & Flags::kPrimary) {
139 if (execl(kFusePath, kFusePath,
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800140 "-u", "1023", // AID_MEDIA_RW
141 "-g", "1023", // AID_MEDIA_RW
142 "-d",
143 mRawPath.c_str(),
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700144 mFusePath.c_str(),
145 NULL)) {
146 PLOG(ERROR) << "Failed to exec";
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800147 }
148 } else {
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700149 if (execl(kFusePath, kFusePath,
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800150 "-u", "1023", // AID_MEDIA_RW
151 "-g", "1023", // AID_MEDIA_RW
152 "-w", "1023", // AID_MEDIA_RW
153 "-d",
154 mRawPath.c_str(),
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700155 mFusePath.c_str(),
156 NULL)) {
157 PLOG(ERROR) << "Failed to exec";
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800158 }
159 }
160
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700161 PLOG(DEBUG) << "FUSE exiting";
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800162 _exit(1);
163 }
164
165 if (mFusePid == -1) {
Jeff Sharkey9c484982015-03-31 10:35:33 -0700166 PLOG(ERROR) << getId() << " failed to fork";
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800167 return -errno;
168 }
169
170 return OK;
171}
172
173status_t PublicVolume::doUnmount() {
174 if (mFusePid > 0) {
175 kill(mFusePid, SIGTERM);
176 TEMP_FAILURE_RETRY(waitpid(mFusePid, nullptr, 0));
177 mFusePid = 0;
178 }
179
Jeff Sharkey48d81d32015-04-12 21:50:32 -0700180 ForceUnmount(kAsecPath);
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800181 ForceUnmount(mFusePath);
182 ForceUnmount(mRawPath);
183
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700184 if (TEMP_FAILURE_RETRY(rmdir(mRawPath.c_str()))) {
Jeff Sharkey9c484982015-03-31 10:35:33 -0700185 PLOG(ERROR) << getId() << " failed to rmdir mount point " << mRawPath;
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700186 }
187 if (TEMP_FAILURE_RETRY(rmdir(mFusePath.c_str()))) {
Jeff Sharkey9c484982015-03-31 10:35:33 -0700188 PLOG(ERROR) << getId() << " failed to rmdir mount point " << mFusePath;
Jeff Sharkey36801cc2015-03-13 16:09:20 -0700189 }
190
191 mFusePath.clear();
192 mRawPath.clear();
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800193
194 return OK;
195}
196
197status_t PublicVolume::doFormat() {
198 if (Fat::format(mDevPath.c_str(), 0, true)) {
Jeff Sharkey9c484982015-03-31 10:35:33 -0700199 LOG(ERROR) << getId() << " failed to format";
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800200 return -errno;
201 }
202 return OK;
203}
204
Jeff Sharkeydeb24052015-03-02 21:01:40 -0800205} // namespace vold
206} // namespace android