a9d5080109
am: 20a8fa98f6
* commit '20a8fa98f6b858999b623272a182843259e1044c':
Track rename from base/ to android-base/.
133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
/*
|
|
* Copyright (C) 2015 The Android Open Source 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 "Utils.h"
|
|
|
|
#include <android-base/stringprintf.h>
|
|
#include <android-base/logging.h>
|
|
#include <cutils/fs.h>
|
|
#include <private/android_filesystem_config.h>
|
|
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
|
|
using android::base::StringPrintf;
|
|
|
|
namespace android {
|
|
namespace vold {
|
|
|
|
static const char* kFusePath = "/system/bin/sdcard";
|
|
|
|
EmulatedVolume::EmulatedVolume(const std::string& rawPath) :
|
|
VolumeBase(Type::kEmulated), mFusePid(0) {
|
|
setId("emulated");
|
|
mRawPath = rawPath;
|
|
mLabel = "emulated";
|
|
}
|
|
|
|
EmulatedVolume::EmulatedVolume(const std::string& rawPath, dev_t device,
|
|
const std::string& fsUuid) : VolumeBase(Type::kEmulated), mFusePid(0) {
|
|
setId(StringPrintf("emulated:%u,%u", major(device), minor(device)));
|
|
mRawPath = rawPath;
|
|
mLabel = fsUuid;
|
|
}
|
|
|
|
EmulatedVolume::~EmulatedVolume() {
|
|
}
|
|
|
|
status_t EmulatedVolume::doMount() {
|
|
// We could have migrated storage to an adopted private volume, so always
|
|
// call primary storage "emulated" to avoid media rescans.
|
|
std::string label = mLabel;
|
|
if (getMountFlags() & MountFlags::kPrimary) {
|
|
label = "emulated";
|
|
}
|
|
|
|
mFuseDefault = StringPrintf("/mnt/runtime/default/%s", label.c_str());
|
|
mFuseRead = StringPrintf("/mnt/runtime/read/%s", label.c_str());
|
|
mFuseWrite = StringPrintf("/mnt/runtime/write/%s", label.c_str());
|
|
|
|
setInternalPath(mRawPath);
|
|
setPath(StringPrintf("/storage/%s", label.c_str()));
|
|
|
|
if (fs_prepare_dir(mFuseDefault.c_str(), 0700, AID_ROOT, AID_ROOT) ||
|
|
fs_prepare_dir(mFuseRead.c_str(), 0700, AID_ROOT, AID_ROOT) ||
|
|
fs_prepare_dir(mFuseWrite.c_str(), 0700, AID_ROOT, AID_ROOT)) {
|
|
PLOG(ERROR) << getId() << " failed to create mount points";
|
|
return -errno;
|
|
}
|
|
|
|
dev_t before = GetDevice(mFuseWrite);
|
|
|
|
if (!(mFusePid = fork())) {
|
|
if (execl(kFusePath, kFusePath,
|
|
"-u", "1023", // AID_MEDIA_RW
|
|
"-g", "1023", // AID_MEDIA_RW
|
|
"-m",
|
|
"-w",
|
|
mRawPath.c_str(),
|
|
label.c_str(),
|
|
NULL)) {
|
|
PLOG(ERROR) << "Failed to exec";
|
|
}
|
|
|
|
LOG(ERROR) << "FUSE exiting";
|
|
_exit(1);
|
|
}
|
|
|
|
if (mFusePid == -1) {
|
|
PLOG(ERROR) << getId() << " failed to fork";
|
|
return -errno;
|
|
}
|
|
|
|
while (before == GetDevice(mFuseWrite)) {
|
|
LOG(VERBOSE) << "Waiting for FUSE to spin up...";
|
|
usleep(50000); // 50ms
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
status_t EmulatedVolume::doUnmount() {
|
|
if (mFusePid > 0) {
|
|
kill(mFusePid, SIGTERM);
|
|
TEMP_FAILURE_RETRY(waitpid(mFusePid, nullptr, 0));
|
|
mFusePid = 0;
|
|
}
|
|
|
|
KillProcessesUsingPath(getPath());
|
|
ForceUnmount(mFuseDefault);
|
|
ForceUnmount(mFuseRead);
|
|
ForceUnmount(mFuseWrite);
|
|
|
|
rmdir(mFuseDefault.c_str());
|
|
rmdir(mFuseRead.c_str());
|
|
rmdir(mFuseWrite.c_str());
|
|
|
|
mFuseDefault.clear();
|
|
mFuseRead.clear();
|
|
mFuseWrite.clear();
|
|
|
|
return OK;
|
|
}
|
|
|
|
} // namespace vold
|
|
} // namespace android
|