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/*
* Copyright (C) 2015 The Android Open Source Project
* Copyright (C) 2019 The LineageOS Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "EmulatedVolume.h"
#include <volume_manager/VolumeManager.h>
#include "ResponseCode.h"
#include "Utils.h"
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <cutils/fs.h>
#include <private/android_filesystem_config.h>
#include <iostream>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
using android::base::StringPrintf;
namespace android {
namespace volmgr {
static const std::string kStagingPath = "/mnt/staging/emulated";
static const std::string kFbeKeyVersion = kStagingPath + "/unencrypted/key/version";
EmulatedVolume::EmulatedVolume(FstabEntry* rec, const std::string& subdir)
: VolumeBase(Type::kEmulated),
mSubdir(subdir),
mDevPath(rec->blk_device),
mFsType(rec->fs_type),
mFlags(rec->flags),
mFsOptions(rec->fs_options) {
setId("emulated");
setPartLabel("internal storage");
setPath("/storage/emulated");
}
EmulatedVolume::~EmulatedVolume() {}
status_t EmulatedVolume::doMount() {
if (fs_prepare_dir(kStagingPath.c_str(), 0700, AID_ROOT, AID_ROOT)) {
PLOG(ERROR) << getId() << " failed to create mount points";
return -errno;
}
if (fs_prepare_dir(getPath().c_str(), 0700, AID_ROOT, AID_ROOT)) {
PLOG(ERROR) << getId() << " failed to create mount points";
return -errno;
}
std::string bindPath = kStagingPath + "/" + mSubdir;
if (::mount(mDevPath.c_str(), kStagingPath.c_str(), mFsType.c_str(), mFlags,
mFsOptions.c_str()) != 0) {
// It's ok to fail mounting if we're encrytped, so avoid printing to recovery's UiLogger
std::cout << getId() << " failed to mount " << mDevPath << " on " << kStagingPath
<< ": " << std::strerror(errno);
return -EIO;
}
if (BindMount(bindPath, getPath()) != OK) {
PLOG(ERROR) << getId() << " failed to bind mount " << bindPath << " on " << getPath();
ForceUnmount(kStagingPath);
return -EIO;
}
return OK;
}
status_t EmulatedVolume::doUnmount(bool detach /* = false */) {
ForceUnmount(getPath(), detach);
ForceUnmount(kStagingPath, detach);
rmdir(getPath().c_str());
rmdir(kStagingPath.c_str());
return OK;
}
bool EmulatedVolume::detectMountable() {
bool mountable = false;
if (doMount() == OK) {
// Check if FBE encrypted
mountable = access(kFbeKeyVersion.c_str(), F_OK) != 0;
doUnmount();
}
return mountable;
}
} // namespace volmgr
} // namespace android
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