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 "Utils.h"
18 #include "VolumeBase.h"
19 #include "VolumeManager.h"
20 #include "ResponseCode.h"
21
22 #include <android-base/stringprintf.h>
23 #include <android-base/logging.h>
24
25 #include <fcntl.h>
26 #include <stdlib.h>
27 #include <sys/mount.h>
28 #include <sys/stat.h>
29 #include <sys/types.h>
30
31 using android::base::StringPrintf;
32
33 #define DEBUG 1
34
35 namespace android {
36 namespace vold {
37
VolumeBase(Type type)38 VolumeBase::VolumeBase(Type type) :
39 mType(type), mMountFlags(0), mMountUserId(-1), mCreated(false), mState(
40 State::kUnmounted), mSilent(false) {
41 }
42
~VolumeBase()43 VolumeBase::~VolumeBase() {
44 CHECK(!mCreated);
45 }
46
setState(State state)47 void VolumeBase::setState(State state) {
48 mState = state;
49 notifyEvent(ResponseCode::VolumeStateChanged, StringPrintf("%d", mState));
50 }
51
setDiskId(const std::string & diskId)52 status_t VolumeBase::setDiskId(const std::string& diskId) {
53 if (mCreated) {
54 LOG(WARNING) << getId() << " diskId change requires destroyed";
55 return -EBUSY;
56 }
57
58 mDiskId = diskId;
59 return OK;
60 }
61
setPartGuid(const std::string & partGuid)62 status_t VolumeBase::setPartGuid(const std::string& partGuid) {
63 if (mCreated) {
64 LOG(WARNING) << getId() << " partGuid change requires destroyed";
65 return -EBUSY;
66 }
67
68 mPartGuid = partGuid;
69 return OK;
70 }
71
setMountFlags(int mountFlags)72 status_t VolumeBase::setMountFlags(int mountFlags) {
73 if ((mState != State::kUnmounted) && (mState != State::kUnmountable)) {
74 LOG(WARNING) << getId() << " flags change requires state unmounted or unmountable";
75 return -EBUSY;
76 }
77
78 mMountFlags = mountFlags;
79 return OK;
80 }
81
setMountUserId(userid_t mountUserId)82 status_t VolumeBase::setMountUserId(userid_t mountUserId) {
83 if ((mState != State::kUnmounted) && (mState != State::kUnmountable)) {
84 LOG(WARNING) << getId() << " user change requires state unmounted or unmountable";
85 return -EBUSY;
86 }
87
88 mMountUserId = mountUserId;
89 return OK;
90 }
91
setSilent(bool silent)92 status_t VolumeBase::setSilent(bool silent) {
93 if (mCreated) {
94 LOG(WARNING) << getId() << " silence change requires destroyed";
95 return -EBUSY;
96 }
97
98 mSilent = silent;
99 return OK;
100 }
101
setId(const std::string & id)102 status_t VolumeBase::setId(const std::string& id) {
103 if (mCreated) {
104 LOG(WARNING) << getId() << " id change requires not created";
105 return -EBUSY;
106 }
107
108 mId = id;
109 return OK;
110 }
111
setPath(const std::string & path)112 status_t VolumeBase::setPath(const std::string& path) {
113 if (mState != State::kChecking) {
114 LOG(WARNING) << getId() << " path change requires state checking";
115 return -EBUSY;
116 }
117
118 mPath = path;
119 notifyEvent(ResponseCode::VolumePathChanged, mPath);
120 return OK;
121 }
122
setInternalPath(const std::string & internalPath)123 status_t VolumeBase::setInternalPath(const std::string& internalPath) {
124 if (mState != State::kChecking) {
125 LOG(WARNING) << getId() << " internal path change requires state checking";
126 return -EBUSY;
127 }
128
129 mInternalPath = internalPath;
130 notifyEvent(ResponseCode::VolumeInternalPathChanged, mInternalPath);
131 return OK;
132 }
133
notifyEvent(int event)134 void VolumeBase::notifyEvent(int event) {
135 if (mSilent) return;
136 VolumeManager::Instance()->getBroadcaster()->sendBroadcast(event,
137 getId().c_str(), false);
138 }
139
notifyEvent(int event,const std::string & value)140 void VolumeBase::notifyEvent(int event, const std::string& value) {
141 if (mSilent) return;
142 VolumeManager::Instance()->getBroadcaster()->sendBroadcast(event,
143 StringPrintf("%s %s", getId().c_str(), value.c_str()).c_str(), false);
144 }
145
addVolume(const std::shared_ptr<VolumeBase> & volume)146 void VolumeBase::addVolume(const std::shared_ptr<VolumeBase>& volume) {
147 mVolumes.push_back(volume);
148 }
149
removeVolume(const std::shared_ptr<VolumeBase> & volume)150 void VolumeBase::removeVolume(const std::shared_ptr<VolumeBase>& volume) {
151 mVolumes.remove(volume);
152 }
153
findVolume(const std::string & id)154 std::shared_ptr<VolumeBase> VolumeBase::findVolume(const std::string& id) {
155 for (auto vol : mVolumes) {
156 if (vol->getId() == id) {
157 return vol;
158 }
159 }
160 return nullptr;
161 }
162
create()163 status_t VolumeBase::create() {
164 CHECK(!mCreated);
165
166 mCreated = true;
167 status_t res = doCreate();
168 notifyEvent(ResponseCode::VolumeCreated,
169 StringPrintf("%d \"%s\" \"%s\"", mType, mDiskId.c_str(), mPartGuid.c_str()));
170 setState(State::kUnmounted);
171 return res;
172 }
173
doCreate()174 status_t VolumeBase::doCreate() {
175 return OK;
176 }
177
destroy()178 status_t VolumeBase::destroy() {
179 CHECK(mCreated);
180
181 if (mState == State::kMounted) {
182 unmount();
183 setState(State::kBadRemoval);
184 } else {
185 setState(State::kRemoved);
186 }
187
188 notifyEvent(ResponseCode::VolumeDestroyed);
189 status_t res = doDestroy();
190 mCreated = false;
191 return res;
192 }
193
doDestroy()194 status_t VolumeBase::doDestroy() {
195 return OK;
196 }
197
mount()198 status_t VolumeBase::mount() {
199 if ((mState != State::kUnmounted) && (mState != State::kUnmountable)) {
200 LOG(WARNING) << getId() << " mount requires state unmounted or unmountable";
201 return -EBUSY;
202 }
203
204 setState(State::kChecking);
205 status_t res = doMount();
206 if (res == OK) {
207 setState(State::kMounted);
208 } else {
209 setState(State::kUnmountable);
210 }
211
212 return res;
213 }
214
unmount()215 status_t VolumeBase::unmount() {
216 if (mState != State::kMounted) {
217 LOG(WARNING) << getId() << " unmount requires state mounted";
218 return -EBUSY;
219 }
220
221 setState(State::kEjecting);
222 for (auto vol : mVolumes) {
223 if (vol->destroy()) {
224 LOG(WARNING) << getId() << " failed to destroy " << vol->getId()
225 << " stacked above";
226 }
227 }
228 mVolumes.clear();
229
230 status_t res = doUnmount();
231 setState(State::kUnmounted);
232 return res;
233 }
234
format(const std::string & fsType)235 status_t VolumeBase::format(const std::string& fsType) {
236 if (mState == State::kMounted) {
237 unmount();
238 }
239
240 if ((mState != State::kUnmounted) && (mState != State::kUnmountable)) {
241 LOG(WARNING) << getId() << " format requires state unmounted or unmountable";
242 return -EBUSY;
243 }
244
245 setState(State::kFormatting);
246 status_t res = doFormat(fsType);
247 setState(State::kUnmounted);
248 return res;
249 }
250
doFormat(const std::string & fsType)251 status_t VolumeBase::doFormat(const std::string& fsType) {
252 return -ENOTSUP;
253 }
254
255 } // namespace vold
256 } // namespace android
257