351 lines
11 KiB
C++
351 lines
11 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 "PublicVolume.h"
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#include "AppFuseUtil.h"
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#include "Utils.h"
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#include "VolumeManager.h"
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#include "fs/Exfat.h"
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#include "fs/Vfat.h"
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#include <android-base/logging.h>
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#include <android-base/properties.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::GetBoolProperty;
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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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static const char* kAsecPath = "/mnt/secure/asec";
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PublicVolume::PublicVolume(dev_t device) : VolumeBase(Type::kPublic), mDevice(device), mFusePid(0) {
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setId(StringPrintf("public:%u,%u", major(device), minor(device)));
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mDevPath = StringPrintf("/dev/block/vold/%s", getId().c_str());
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}
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PublicVolume::~PublicVolume() {}
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status_t PublicVolume::readMetadata() {
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status_t res = ReadMetadataUntrusted(mDevPath, &mFsType, &mFsUuid, &mFsLabel);
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auto listener = getListener();
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if (listener) listener->onVolumeMetadataChanged(getId(), mFsType, mFsUuid, mFsLabel);
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return res;
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}
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status_t PublicVolume::initAsecStage() {
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std::string legacyPath(mRawPath + "/android_secure");
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std::string securePath(mRawPath + "/.android_secure");
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// Recover legacy secure path
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if (!access(legacyPath.c_str(), R_OK | X_OK) && access(securePath.c_str(), R_OK | X_OK)) {
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if (rename(legacyPath.c_str(), securePath.c_str())) {
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PLOG(WARNING) << getId() << " failed to rename legacy ASEC dir";
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}
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}
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if (TEMP_FAILURE_RETRY(mkdir(securePath.c_str(), 0700))) {
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if (errno != EEXIST) {
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PLOG(WARNING) << getId() << " creating ASEC stage failed";
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return -errno;
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}
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}
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BindMount(securePath, kAsecPath);
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return OK;
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}
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status_t PublicVolume::doCreate() {
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return CreateDeviceNode(mDevPath, mDevice);
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}
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status_t PublicVolume::doDestroy() {
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return DestroyDeviceNode(mDevPath);
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}
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status_t PublicVolume::doMount() {
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readMetadata();
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if (mFsType == "vfat" && vfat::IsSupported()) {
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if (vfat::Check(mDevPath)) {
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LOG(ERROR) << getId() << " failed filesystem check";
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return -EIO;
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}
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} else if (mFsType == "exfat" && exfat::IsSupported()) {
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if (exfat::Check(mDevPath)) {
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LOG(ERROR) << getId() << " failed filesystem check";
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return -EIO;
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}
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} else {
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LOG(ERROR) << getId() << " unsupported filesystem " << mFsType;
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return -EIO;
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}
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// Use UUID as stable name, if available
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std::string stableName = getId();
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if (!mFsUuid.empty()) {
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stableName = mFsUuid;
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}
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mRawPath = StringPrintf("/mnt/media_rw/%s", stableName.c_str());
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mFuseDefault = StringPrintf("/mnt/runtime/default/%s", stableName.c_str());
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mFuseRead = StringPrintf("/mnt/runtime/read/%s", stableName.c_str());
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mFuseWrite = StringPrintf("/mnt/runtime/write/%s", stableName.c_str());
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mFuseFull = StringPrintf("/mnt/runtime/full/%s", stableName.c_str());
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setInternalPath(mRawPath);
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if (getMountFlags() & MountFlags::kVisible) {
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setPath(StringPrintf("/storage/%s", stableName.c_str()));
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} else {
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setPath(mRawPath);
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}
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if (fs_prepare_dir(mRawPath.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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if (mFsType == "vfat") {
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if (vfat::Mount(mDevPath, mRawPath, false, false, false, AID_MEDIA_RW, AID_MEDIA_RW, 0007,
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true)) {
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PLOG(ERROR) << getId() << " failed to mount " << mDevPath;
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return -EIO;
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}
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} else if (mFsType == "exfat") {
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if (exfat::Mount(mDevPath, mRawPath, AID_MEDIA_RW, AID_MEDIA_RW, 0007)) {
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PLOG(ERROR) << getId() << " failed to mount " << mDevPath;
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return -EIO;
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}
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}
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if (getMountFlags() & MountFlags::kPrimary) {
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initAsecStage();
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}
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if (!(getMountFlags() & MountFlags::kVisible)) {
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// Not visible to apps, so no need to spin up FUSE
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return OK;
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}
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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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fs_prepare_dir(mFuseFull.c_str(), 0700, AID_ROOT, AID_ROOT)) {
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PLOG(ERROR) << getId() << " failed to create FUSE mount points";
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return -errno;
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}
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dev_t before = GetDevice(mFuseFull);
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bool isFuse = base::GetBoolProperty(kPropFuseSnapshot, false);
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if (isFuse) {
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LOG(INFO) << "Mounting public fuse volume";
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android::base::unique_fd fd;
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int user_id = getMountUserId();
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int result = MountUserFuse(user_id, stableName, &fd);
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if (result != 0) {
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LOG(ERROR) << "Failed to mount public fuse volume";
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return -result;
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}
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setFuseFd(std::move(fd));
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std::string pass_through_path(StringPrintf("/mnt/pass_through/%d/%s",
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user_id, stableName.c_str()));
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return BindMount(getInternalPath(), pass_through_path);
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}
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if (!(mFusePid = fork())) {
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if (getMountFlags() & MountFlags::kPrimary) {
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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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"-U", std::to_string(getMountUserId()).c_str(),
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"-w",
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mRawPath.c_str(),
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stableName.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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} else {
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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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"-U", std::to_string(getMountUserId()).c_str(),
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mRawPath.c_str(),
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stableName.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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}
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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(mFuseFull)) {
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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 PublicVolume::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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bool isFuse = base::GetBoolProperty(kPropFuseSnapshot, false);
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if (isFuse) {
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// Use UUID as stable name, if available
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std::string stableName = getId();
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if (!mFsUuid.empty()) {
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stableName = mFsUuid;
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}
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std::string path(StringPrintf("/mnt/user/%d/%s", getMountUserId(), stableName.c_str()));
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status_t result = ForceUnmount(path);
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if (result != OK) {
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// TODO(135341433): MNT_DETACH is needed for fuse because umount2 can fail with EBUSY.
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// Figure out why we get EBUSY and remove this special casing if possible.
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if (!umount2(path.c_str(), UMOUNT_NOFOLLOW | MNT_DETACH) || errno == EINVAL ||
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errno == ENOENT) {
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PLOG(INFO) << "ForceUnmount failed on public fuse volume";
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}
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}
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rmdir(path.c_str());
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setFuseFd(android::base::unique_fd());
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return OK;
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}
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ForceUnmount(kAsecPath);
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ForceUnmount(mFuseDefault);
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ForceUnmount(mFuseRead);
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ForceUnmount(mFuseWrite);
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ForceUnmount(mFuseFull);
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ForceUnmount(mRawPath);
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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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rmdir(mFuseFull.c_str());
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rmdir(mRawPath.c_str());
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mFuseDefault.clear();
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mFuseRead.clear();
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mFuseWrite.clear();
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mFuseFull.clear();
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mRawPath.clear();
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return OK;
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}
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status_t PublicVolume::doFormat(const std::string& fsType) {
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bool useVfat = vfat::IsSupported();
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bool useExfat = exfat::IsSupported();
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status_t res = OK;
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// Resolve the target filesystem type
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if (fsType == "auto" && useVfat && useExfat) {
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uint64_t size = 0;
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res = GetBlockDevSize(mDevPath, &size);
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if (res != OK) {
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LOG(ERROR) << "Couldn't get device size " << mDevPath;
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return res;
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}
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// If both vfat & exfat are supported use exfat for SDXC (>~32GiB) cards
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if (size > 32896LL * 1024 * 1024) {
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useVfat = false;
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} else {
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useExfat = false;
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}
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} else if (fsType == "vfat") {
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useExfat = false;
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} else if (fsType == "exfat") {
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useVfat = false;
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}
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if (!useVfat && !useExfat) {
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LOG(ERROR) << "Unsupported filesystem " << fsType;
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return -EINVAL;
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}
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if (WipeBlockDevice(mDevPath) != OK) {
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LOG(WARNING) << getId() << " failed to wipe";
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}
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if (useVfat) {
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res = vfat::Format(mDevPath, 0);
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} else if (useExfat) {
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res = exfat::Format(mDevPath);
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}
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if (res != OK) {
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LOG(ERROR) << getId() << " failed to format";
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res = -errno;
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}
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return res;
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}
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} // namespace vold
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} // namespace android
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