147 lines
4.4 KiB
C++
147 lines
4.4 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 <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <cutils/fs.h>
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#include <private/android_filesystem_config.h>
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#include <utils/Timers.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/sysmacros.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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mRawPath = rawPath;
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mLabel = "emulated";
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}
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EmulatedVolume::EmulatedVolume(const std::string& rawPath, dev_t device, const std::string& fsUuid)
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: VolumeBase(Type::kEmulated), mFusePid(0) {
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setId(StringPrintf("emulated:%u,%u", major(device), minor(device)));
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mRawPath = rawPath;
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mLabel = fsUuid;
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}
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EmulatedVolume::~EmulatedVolume() {}
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status_t EmulatedVolume::doMount() {
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// We could have migrated storage to an adopted private volume, so always
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// call primary storage "emulated" to avoid media rescans.
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std::string label = mLabel;
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if (getMountFlags() & MountFlags::kPrimary) {
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label = "emulated";
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}
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mFuseDefault = StringPrintf("/mnt/runtime/default/%s", label.c_str());
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mFuseRead = StringPrintf("/mnt/runtime/read/%s", label.c_str());
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mFuseWrite = StringPrintf("/mnt/runtime/write/%s", label.c_str());
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setInternalPath(mRawPath);
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setPath(StringPrintf("/storage/%s", label.c_str()));
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setLabel(label);
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if (fs_prepare_dir(mFuseDefault.c_str(), 0700, AID_ROOT, AID_ROOT) ||
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fs_prepare_dir(mFuseRead.c_str(), 0700, AID_ROOT, AID_ROOT) ||
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fs_prepare_dir(mFuseWrite.c_str(), 0700, AID_ROOT, AID_ROOT)) {
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PLOG(ERROR) << getId() << " failed to create mount points";
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return -errno;
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}
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dev_t before = GetDevice(mFuseWrite);
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if (!(mFusePid = fork())) {
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// clang-format off
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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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"-m",
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"-w",
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"-G",
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"-i",
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mRawPath.c_str(),
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label.c_str(),
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NULL)) {
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// clang-format on
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PLOG(ERROR) << "Failed to exec";
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}
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LOG(ERROR) << "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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nsecs_t start = systemTime(SYSTEM_TIME_BOOTTIME);
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while (before == GetDevice(mFuseWrite)) {
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LOG(DEBUG) << "Waiting for FUSE to spin up...";
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usleep(50000); // 50ms
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nsecs_t now = systemTime(SYSTEM_TIME_BOOTTIME);
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if (nanoseconds_to_milliseconds(now - start) > 5000) {
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LOG(WARNING) << "Timed out while waiting for FUSE to spin up";
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return -ETIMEDOUT;
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}
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}
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/* sdcardfs will have exited already. FUSE will still be running */
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TEMP_FAILURE_RETRY(waitpid(mFusePid, nullptr, 0));
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mFusePid = 0;
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return OK;
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}
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status_t EmulatedVolume::doUnmount() {
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// Unmount the storage before we kill the FUSE process. If we kill
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// the FUSE process first, most file system operations will return
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// ENOTCONN until the unmount completes. This is an exotic and unusual
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// error code and might cause broken behaviour in applications.
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KillProcessesUsingPath(getPath());
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ForceUnmount(mFuseDefault);
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ForceUnmount(mFuseRead);
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ForceUnmount(mFuseWrite);
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rmdir(mFuseDefault.c_str());
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rmdir(mFuseRead.c_str());
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rmdir(mFuseWrite.c_str());
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mFuseDefault.clear();
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mFuseRead.clear();
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mFuseWrite.clear();
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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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