8d15cb9828
Used by framework to bypass FUSE daemon overhead in some cases. Bug: 21017105 Change-Id: I2f3ae70607417fc4cd2c970cb17cf3afa2f42613
108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "EmulatedVolume.h"
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#include "Utils.h"
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#include <base/stringprintf.h>
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#include <base/logging.h>
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#include <cutils/fs.h>
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#include <private/android_filesystem_config.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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using android::base::StringPrintf;
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namespace android {
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namespace vold {
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static const char* kFusePath = "/system/bin/sdcard";
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EmulatedVolume::EmulatedVolume(const std::string& rawPath) :
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VolumeBase(Type::kEmulated), mFusePid(0) {
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setId("emulated");
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mFusePath = "/storage/emulated";
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mRawPath = rawPath;
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}
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EmulatedVolume::EmulatedVolume(const std::string& rawPath, dev_t device,
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const std::string& fsUuid) : VolumeBase(Type::kEmulated), mFusePid(0) {
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setId(StringPrintf("emulated:%u,%u", major(device), minor(device)));
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mFusePath = StringPrintf("/storage/%s", fsUuid.c_str());
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mRawPath = rawPath;
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}
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EmulatedVolume::~EmulatedVolume() {
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}
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status_t EmulatedVolume::doMount() {
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if (fs_prepare_dir(mFusePath.c_str(), 0700, AID_ROOT, AID_ROOT)) {
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PLOG(ERROR) << getId() << " failed to create mount point " << mFusePath;
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return -errno;
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}
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setInternalPath(mRawPath);
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setPath(mFusePath);
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if (!(mFusePid = fork())) {
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// TODO: protect when not mounted as visible
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if (execl(kFusePath, kFusePath,
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"-u", "1023", // AID_MEDIA_RW
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"-g", "1023", // AID_MEDIA_RW
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"-l",
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mRawPath.c_str(),
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mFusePath.c_str(),
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NULL)) {
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PLOG(ERROR) << "Failed to exec";
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}
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PLOG(DEBUG) << "FUSE exiting";
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_exit(1);
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}
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if (mFusePid == -1) {
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PLOG(ERROR) << getId() << " failed to fork";
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return -errno;
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}
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return OK;
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}
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status_t EmulatedVolume::doUnmount() {
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if (mFusePid > 0) {
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kill(mFusePid, SIGTERM);
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TEMP_FAILURE_RETRY(waitpid(mFusePid, nullptr, 0));
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mFusePid = 0;
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}
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ForceUnmount(mFusePath);
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ForceUnmount(mRawPath);
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if (TEMP_FAILURE_RETRY(rmdir(mFusePath.c_str()))) {
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PLOG(ERROR) << getId() << " failed to rmdir mount point " << mFusePath;
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return -errno;
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}
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return OK;
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}
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} // namespace vold
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} // namespace android
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