2 * Copyright (C) 2008 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.
17 #ifndef ANDROID_VOLD_VOLUME_BASE_H
18 #define ANDROID_VOLD_VOLUME_BASE_H
22 #include <cutils/multiuser.h>
23 #include <utils/Errors.h>
25 #include <sys/types.h>
33 * Representation of a mounted volume ready for presentation.
35 * Various subclasses handle the different mounting prerequisites, such as
36 * encryption details, etc. Volumes can also be "stacked" above other
37 * volumes to help communicate dependencies. For example, an ASEC volume
38 * can be stacked on a vfat volume.
40 * Mounted volumes can be asked to manage bind mounts to present themselves
41 * to specific users on the device.
43 * When an unmount is requested, the volume recursively unmounts any stacked
44 * volumes and removes any bind mounts before finally unmounting itself.
48 virtual ~VolumeBase();
59 /* Flag that volume is primary external storage */
61 /* Flag that volume is visible to normal apps */
77 const std::string& getId() { return mId; }
78 const std::string& getDiskId() { return mDiskId; }
79 const std::string& getPartGuid() { return mPartGuid; }
80 Type getType() { return mType; }
81 int getMountFlags() { return mMountFlags; }
82 userid_t getMountUserId() { return mMountUserId; }
83 State getState() { return mState; }
84 const std::string& getPath() { return mPath; }
85 const std::string& getInternalPath() { return mInternalPath; }
87 status_t setDiskId(const std::string& diskId);
88 status_t setPartGuid(const std::string& partGuid);
89 status_t setMountFlags(int mountFlags);
90 status_t setMountUserId(userid_t mountUserId);
91 status_t setSilent(bool silent);
93 void addVolume(const std::shared_ptr<VolumeBase>& volume);
94 void removeVolume(const std::shared_ptr<VolumeBase>& volume);
96 std::shared_ptr<VolumeBase> findVolume(const std::string& id);
102 status_t format(const std::string& fsType);
105 explicit VolumeBase(Type type);
107 virtual status_t doCreate();
108 virtual status_t doDestroy();
109 virtual status_t doMount() = 0;
110 virtual status_t doUnmount() = 0;
111 virtual status_t doFormat(const std::string& fsType);
113 status_t setId(const std::string& id);
114 status_t setPath(const std::string& path);
115 status_t setInternalPath(const std::string& internalPath);
117 void notifyEvent(int msg);
118 void notifyEvent(int msg, const std::string& value);
121 /* ID that uniquely references volume while alive */
123 /* ID that uniquely references parent disk while alive */
125 /* Partition GUID of this volume */
126 std::string mPartGuid;
129 /* Flags used when mounting this volume */
131 /* User that owns this volume, otherwise -1 */
132 userid_t mMountUserId;
133 /* Flag indicating object is created */
135 /* Current state of volume */
137 /* Path to mounted volume */
139 /* Path to internal backing storage */
140 std::string mInternalPath;
141 /* Flag indicating that volume should emit no events */
144 /* Volumes stacked on top of this volume */
145 std::list<std::shared_ptr<VolumeBase>> mVolumes;
147 void setState(State state);
149 DISALLOW_COPY_AND_ASSIGN(VolumeBase);
153 } // namespace android