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459 lines
15 KiB
459 lines
15 KiB
/*
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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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// HUANGLONG add begin
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#include "fs/Ext4.h"
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#include "fs/Ntfs.h"
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// HUANGLONG add end
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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* kSdcardFsPath = "/system/bin/sdcard";
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static const char* kAsecPath = "/mnt/secure/asec";
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// HUANGLONG add begin
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#include "fs/Ext4.h"
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#include "fs/Ntfs.h"
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static const int MAX_PARTITION_NUM = 15;
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static const int PERMMASK = 0006;
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std::string diskNameToStableName(const std::string& diskname, int volNumber)
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{
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const char* sdcardPrefix = "mmcblk";
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std::string mountpoint;
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if (volNumber < 0) {
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return diskname;
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}
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if (!strncmp(diskname.c_str(), sdcardPrefix, strlen(sdcardPrefix))) {
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// if volNumber == 0, means entire sdcard device,treate mountpoint as entire disk, such as mmcblk1
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mountpoint = (volNumber > 0) ? StringPrintf("%sp%d", diskname.c_str(), volNumber)
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: StringPrintf("%s", diskname.c_str());
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} else {
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// if volNumber == 0, means entire usb device,treate mountpoint as entire disk, such as sda
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mountpoint = (volNumber > 0) ? StringPrintf("%s%d", diskname.c_str(), volNumber)
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: StringPrintf("%s", diskname.c_str());
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}
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return mountpoint;
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}
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// HUANGLONG add end
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PublicVolume::PublicVolume(dev_t device) : VolumeBase(Type::kPublic), mDevice(device) {
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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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mFuseMounted = false;
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mUseSdcardFs = IsSdcardfsUsed();
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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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bool isVisible = getMountFlags() & MountFlags::kVisible;
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readMetadata();
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// HUANGLONG modify begin
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// Due to usb compatibility issues,no need return I/O Error if filesystem check fail
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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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}
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} else if (mFsType == "exfat") {
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LOG(ERROR) << "no support exfat filesystem";
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return -EIO;
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} else if (((mFsType == "ext2") || (mFsType == "ext3") || (mFsType == "ext4")) &&
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IsFilesystemSupported("ext4")) {
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// Ext2/3/4 use ext4 filesystem
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LOG(DEBUG) << "filesystem is ext2/3/4";
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} else if (mFsType == "ntfs" && IsFilesystemSupported("ntfs")) {
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LOG(DEBUG) << "filesystem is ntfs";
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if (ntfs::check(mDevPath)) {
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LOG(ERROR) << getId() << "failed ntfs filesystem check";
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}
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} else {
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LOG(ERROR) << getId() << " unsupported filesystem " << mFsType;
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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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// No use disk fs uuid name as mount point name
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// single usb device has max 15 partitions
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stableName = diskNameToStableName(getDiskName(), minor(mDevice) % (MAX_PARTITION_NUM + 1));
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LOG(DEBUG) << "public volume mount : stableName = " << stableName;
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if (stableName.empty()) {
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return -EIO;
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}
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mStableName = stableName;
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// HUANGLONG modify end
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mRawPath = StringPrintf("/mnt/media_rw/%s", stableName.c_str());
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mSdcardFsDefault = StringPrintf("/mnt/runtime/default/%s", stableName.c_str());
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mSdcardFsRead = StringPrintf("/mnt/runtime/read/%s", stableName.c_str());
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mSdcardFsWrite = StringPrintf("/mnt/runtime/write/%s", stableName.c_str());
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mSdcardFsFull = StringPrintf("/mnt/runtime/full/%s", stableName.c_str());
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setInternalPath(mRawPath);
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if (isVisible) {
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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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// HUANGLONG modify begin
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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, PERMMASK,
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true)) {
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PLOG(DEBUG) << mRawPath << " success to mount via vfat with mask 0006!";
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} else {
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PLOG(ERROR) << mRawPath << " mount vfat failed.";
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rmdir(mRawPath.c_str());
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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, PERMMASK)) {
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PLOG(DEBUG) << mRawPath << " success to mount via exfat with mask 0006!";
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} else {
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PLOG(ERROR) << mRawPath << " mount exfat failed.";
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rmdir(mRawPath.c_str());
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return -EIO;
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}
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} else if (mFsType == "ext4" || mFsType == "ext3" || mFsType == "ext2") {
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if (!ext4::Mount(mDevPath, mRawPath, false, false, false, false, PERMMASK, AID_MEDIA_RW,
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AID_SDCARD_RW)) {
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PLOG(DEBUG) << mRawPath << " success to mount via EXT4 !";
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} else {
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PLOG(ERROR) << mRawPath << " mount ext4 failed ";
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rmdir(mRawPath.c_str());
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return -EIO;
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}
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} else if (mFsType == "ntfs") {
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if (!ntfs::doMount(mDevPath, mRawPath, false, false, false, AID_MEDIA_RW, AID_SDCARD_RW,
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PERMMASK, true)) {
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PLOG(DEBUG) << mRawPath << " success to mount via NTFS !";
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} else {
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PLOG(ERROR) << mRawPath << " mount ntfs failed.";
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rmdir(mRawPath.c_str());
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return -EIO;
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}
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} else {
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PLOG(ERROR) << " unknown filesystem , try vfat/ntfs/ext4 again." << std::endl;
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if (!vfat::Mount(mDevPath, mRawPath, false, false, false, AID_MEDIA_RW, AID_SDCARD_RW, PERMMASK,
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true)) {
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LOG(DEBUG) << mRawPath << " success to mount via VFAT !" << std::endl;
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} else if (!ntfs::doMount(mDevPath, mRawPath, false, false, false, AID_MEDIA_RW,
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AID_SDCARD_RW, PERMMASK, true)) {
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LOG(DEBUG) << mRawPath << " success to mount via NTFS !" << std::endl;
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} else if (!ext4::Mount(mDevPath, mRawPath, false, false, false)) {
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LOG(DEBUG) << mRawPath << " success to mount via EXT4 !" << std::endl;
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} else {
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PLOG(ERROR) << mRawPath << " unknown filesystem, can not mount." << std::endl;
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rmdir(mRawPath.c_str());
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return -EIO;
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}
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}
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// HUANGLONG modify end
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if (getMountFlags() & MountFlags::kPrimary) {
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initAsecStage();
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}
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if (!isVisible) {
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// Not visible to apps, so no need to spin up sdcardfs or FUSE
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return OK;
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}
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if (mUseSdcardFs) {
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if (fs_prepare_dir(mSdcardFsDefault.c_str(), 0700, AID_ROOT, AID_ROOT) ||
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fs_prepare_dir(mSdcardFsRead.c_str(), 0700, AID_ROOT, AID_ROOT) ||
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fs_prepare_dir(mSdcardFsWrite.c_str(), 0700, AID_ROOT, AID_ROOT) ||
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fs_prepare_dir(mSdcardFsFull.c_str(), 0700, AID_ROOT, AID_ROOT)) {
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PLOG(ERROR) << getId() << " failed to create sdcardfs mount points";
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return -errno;
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}
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dev_t before = GetDevice(mSdcardFsFull);
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int sdcardFsPid;
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if (!(sdcardFsPid = fork())) {
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if (getMountFlags() & MountFlags::kPrimary) {
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// clang-format off
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if (execl(kSdcardFsPath, kSdcardFsPath,
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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(kSdcardFsPath, kSdcardFsPath,
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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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// HUANGLONG modify begin
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// add write permission for external storage partition
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"-w",
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// HUANGLONG modify end
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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) << "sdcardfs exiting";
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_exit(1);
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}
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if (sdcardFsPid == -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(mSdcardFsFull)) {
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LOG(DEBUG) << "Waiting for sdcardfs 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 sdcardfs 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. The filesystem will still be running */
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TEMP_FAILURE_RETRY(waitpid(sdcardFsPid, nullptr, 0));
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}
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// We need to mount FUSE *after* sdcardfs, since the FUSE daemon may depend
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// on sdcardfs being up.
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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, getInternalPath(), 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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doUnmount();
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return -result;
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}
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mFuseMounted = true;
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auto callback = getMountCallback();
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if (callback) {
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bool is_ready = false;
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callback->onVolumeChecking(std::move(fd), getPath(), getInternalPath(), &is_ready);
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if (!is_ready) {
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LOG(ERROR) << "Failed to complete public volume mount";
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doUnmount();
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return -EIO;
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}
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}
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ConfigureReadAheadForFuse(GetFuseMountPathForUser(user_id, stableName), 256u);
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// See comment in model/EmulatedVolume.cpp
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ConfigureMaxDirtyRatioForFuse(GetFuseMountPathForUser(user_id, stableName), 40u);
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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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if (mFuseMounted) {
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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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// HUANGLONG modify begin
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// fix usb cannot unmount issue
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stableName = mStableName;
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LOG(INFO) << "mStableName: " << mStableName;
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mStableName.clear();
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// HUANGLONG modify end
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if (UnmountUserFuse(getMountUserId(), getInternalPath(), stableName) != OK) {
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PLOG(INFO) << "UnmountUserFuse failed on public fuse volume";
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return -errno;
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}
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mFuseMounted = false;
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}
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ForceUnmount(kAsecPath);
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if (mUseSdcardFs) {
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ForceUnmount(mSdcardFsDefault);
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ForceUnmount(mSdcardFsRead);
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ForceUnmount(mSdcardFsWrite);
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ForceUnmount(mSdcardFsFull);
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rmdir(mSdcardFsDefault.c_str());
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rmdir(mSdcardFsRead.c_str());
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rmdir(mSdcardFsWrite.c_str());
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rmdir(mSdcardFsFull.c_str());
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mSdcardFsDefault.clear();
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mSdcardFsRead.clear();
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mSdcardFsWrite.clear();
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mSdcardFsFull.clear();
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}
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ForceUnmount(mRawPath);
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rmdir(mRawPath.c_str());
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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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