| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * Copyright (C) 2010-2021 Tuxera Inc. |
| * |
| * 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 "PublicVolume.h" |
| |
| #include "AppFuseUtil.h" |
| #include "Utils.h" |
| #include "VolumeManager.h" |
| #include "fs/Exfat.h" |
| #include "fs/Filesystems.h" |
| #include "fs/Vfat.h" |
| |
| #include <android-base/logging.h> |
| #include <android-base/properties.h> |
| #include <android-base/stringprintf.h> |
| #include <cutils/fs.h> |
| #include <private/android_filesystem_config.h> |
| #include <utils/Timers.h> |
| |
| #include <fcntl.h> |
| #include <stdlib.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| #include <sys/sysmacros.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| |
| using android::base::GetBoolProperty; |
| using android::base::StringPrintf; |
| |
| namespace android { |
| namespace vold { |
| |
| static const char* kSdcardFsPath = "/system/bin/sdcard"; |
| |
| static const char* kAsecPath = "/mnt/secure/asec"; |
| |
| PublicVolume::PublicVolume(dev_t device) : VolumeBase(Type::kPublic), mDevice(device) { |
| setId(StringPrintf("public:%u,%u", major(device), minor(device))); |
| mDevPath = StringPrintf("/dev/block/vold/%s", getId().c_str()); |
| mFuseMounted = false; |
| mUseSdcardFs = IsSdcardfsUsed(); |
| } |
| |
| PublicVolume::~PublicVolume() {} |
| |
| status_t PublicVolume::readMetadata() { |
| if(filesystems::Detect(mDevPath, &mFsTypeId)) { |
| /* Error while detecting filesystem. This should not happen, but in case |
| * it does, pretend that it is recognized as FAT since this most |
| * accurately reflects the behaviour of a stock AOSP vold. */ |
| mFsTypeId = FSTYPE_FAT; |
| } |
| |
| status_t res = ReadMetadataUntrusted(mDevPath, &mFsType, &mFsUuid, &mFsLabel); |
| |
| auto listener = getListener(); |
| if (listener) listener->onVolumeMetadataChanged(getId(), mFsType, mFsUuid, mFsLabel); |
| |
| return res; |
| } |
| |
| status_t PublicVolume::initAsecStage() { |
| std::string legacyPath(mRawPath + "/android_secure"); |
| std::string securePath(mRawPath + "/.android_secure"); |
| |
| // Recover legacy secure path |
| if (!access(legacyPath.c_str(), R_OK | X_OK) && access(securePath.c_str(), R_OK | X_OK)) { |
| if (rename(legacyPath.c_str(), securePath.c_str())) { |
| PLOG(WARNING) << getId() << " failed to rename legacy ASEC dir"; |
| } |
| } |
| |
| if (TEMP_FAILURE_RETRY(mkdir(securePath.c_str(), 0700))) { |
| if (errno != EEXIST) { |
| PLOG(WARNING) << getId() << " creating ASEC stage failed"; |
| return -errno; |
| } |
| } |
| |
| BindMount(securePath, kAsecPath); |
| |
| return OK; |
| } |
| |
| status_t PublicVolume::doCreate() { |
| return CreateDeviceNode(mDevPath, mDevice); |
| } |
| |
| status_t PublicVolume::doDestroy() { |
| return DestroyDeviceNode(mDevPath); |
| } |
| |
| status_t PublicVolume::doMount() { |
| bool isVisible = getMountFlags() & MountFlags::kVisible; |
| readMetadata(); |
| |
| if (!filesystems::IsSupported(mFsTypeId)) { |
| LOG(ERROR) << getId() << " unsupported filesystem " << mFsType; |
| return -EIO; |
| } |
| |
| if (filesystems::Check(mFsTypeId, mDevPath)) { |
| LOG(ERROR) << getId() << " failed filesystem check"; |
| return -EIO; |
| } |
| |
| // Use UUID as stable name, if available |
| std::string stableName = getId(); |
| if (!mFsUuid.empty()) { |
| stableName = mFsUuid; |
| } |
| |
| mRawPath = StringPrintf("/mnt/media_rw/%s", stableName.c_str()); |
| |
| mSdcardFsDefault = StringPrintf("/mnt/runtime/default/%s", stableName.c_str()); |
| mSdcardFsRead = StringPrintf("/mnt/runtime/read/%s", stableName.c_str()); |
| mSdcardFsWrite = StringPrintf("/mnt/runtime/write/%s", stableName.c_str()); |
| mSdcardFsFull = StringPrintf("/mnt/runtime/full/%s", stableName.c_str()); |
| |
| setInternalPath(mRawPath); |
| if (isVisible) { |
| setPath(StringPrintf("/storage/%s", stableName.c_str())); |
| } else { |
| setPath(mRawPath); |
| } |
| |
| if (fs_prepare_dir(mRawPath.c_str(), 0700, AID_ROOT, AID_ROOT)) { |
| PLOG(ERROR) << getId() << " failed to create mount points"; |
| return -errno; |
| } |
| |
| if (filesystems::Mount(mFsTypeId, mDevPath, mRawPath, false, false, false, |
| AID_ROOT, (isVisible ? AID_MEDIA_RW : AID_EXTERNAL_STORAGE), |
| 0007, true)) { |
| PLOG(ERROR) << getId() << " failed to mount " << mDevPath; |
| return -EIO; |
| } |
| |
| if (getMountFlags() & MountFlags::kPrimary) { |
| initAsecStage(); |
| } |
| |
| if (!isVisible) { |
| // Not visible to apps, so no need to spin up sdcardfs or FUSE |
| return OK; |
| } |
| |
| if (mUseSdcardFs) { |
| if (fs_prepare_dir(mSdcardFsDefault.c_str(), 0700, AID_ROOT, AID_ROOT) || |
| fs_prepare_dir(mSdcardFsRead.c_str(), 0700, AID_ROOT, AID_ROOT) || |
| fs_prepare_dir(mSdcardFsWrite.c_str(), 0700, AID_ROOT, AID_ROOT) || |
| fs_prepare_dir(mSdcardFsFull.c_str(), 0700, AID_ROOT, AID_ROOT)) { |
| PLOG(ERROR) << getId() << " failed to create sdcardfs mount points"; |
| return -errno; |
| } |
| |
| dev_t before = GetDevice(mSdcardFsFull); |
| |
| int sdcardFsPid; |
| if (!(sdcardFsPid = fork())) { |
| if (getMountFlags() & MountFlags::kPrimary) { |
| // clang-format off |
| if (execl(kSdcardFsPath, kSdcardFsPath, |
| "-u", "1023", // AID_MEDIA_RW |
| "-g", "1023", // AID_MEDIA_RW |
| "-U", std::to_string(getMountUserId()).c_str(), |
| "-w", |
| mRawPath.c_str(), |
| stableName.c_str(), |
| NULL)) { |
| // clang-format on |
| PLOG(ERROR) << "Failed to exec"; |
| } |
| } else { |
| // clang-format off |
| if (execl(kSdcardFsPath, kSdcardFsPath, |
| "-u", "1023", // AID_MEDIA_RW |
| "-g", "1023", // AID_MEDIA_RW |
| "-U", std::to_string(getMountUserId()).c_str(), |
| mRawPath.c_str(), |
| stableName.c_str(), |
| NULL)) { |
| // clang-format on |
| PLOG(ERROR) << "Failed to exec"; |
| } |
| } |
| |
| LOG(ERROR) << "sdcardfs exiting"; |
| _exit(1); |
| } |
| |
| if (sdcardFsPid == -1) { |
| PLOG(ERROR) << getId() << " failed to fork"; |
| return -errno; |
| } |
| |
| nsecs_t start = systemTime(SYSTEM_TIME_BOOTTIME); |
| while (before == GetDevice(mSdcardFsFull)) { |
| LOG(DEBUG) << "Waiting for sdcardfs to spin up..."; |
| usleep(50000); // 50ms |
| |
| nsecs_t now = systemTime(SYSTEM_TIME_BOOTTIME); |
| if (nanoseconds_to_milliseconds(now - start) > 5000) { |
| LOG(WARNING) << "Timed out while waiting for sdcardfs to spin up"; |
| return -ETIMEDOUT; |
| } |
| } |
| /* sdcardfs will have exited already. The filesystem will still be running */ |
| TEMP_FAILURE_RETRY(waitpid(sdcardFsPid, nullptr, 0)); |
| } |
| |
| bool isFuse = base::GetBoolProperty(kPropFuse, false); |
| if (isFuse) { |
| // We need to mount FUSE *after* sdcardfs, since the FUSE daemon may depend |
| // on sdcardfs being up. |
| LOG(INFO) << "Mounting public fuse volume"; |
| android::base::unique_fd fd; |
| int user_id = getMountUserId(); |
| int result = MountUserFuse(user_id, getInternalPath(), stableName, &fd); |
| |
| if (result != 0) { |
| LOG(ERROR) << "Failed to mount public fuse volume"; |
| doUnmount(); |
| return -result; |
| } |
| |
| mFuseMounted = true; |
| auto callback = getMountCallback(); |
| if (callback) { |
| bool is_ready = false; |
| callback->onVolumeChecking(std::move(fd), getPath(), getInternalPath(), &is_ready); |
| if (!is_ready) { |
| LOG(ERROR) << "Failed to complete public volume mount"; |
| doUnmount(); |
| return -EIO; |
| } |
| } |
| |
| ConfigureReadAheadForFuse(GetFuseMountPathForUser(user_id, stableName), 256u); |
| |
| // See comment in model/EmulatedVolume.cpp |
| ConfigureMaxDirtyRatioForFuse(GetFuseMountPathForUser(user_id, stableName), 40u); |
| } |
| |
| return OK; |
| } |
| |
| status_t PublicVolume::doUnmount() { |
| // Unmount the storage before we kill the FUSE process. If we kill |
| // the FUSE process first, most file system operations will return |
| // ENOTCONN until the unmount completes. This is an exotic and unusual |
| // error code and might cause broken behaviour in applications. |
| KillProcessesUsingPath(getPath()); |
| |
| if (mFuseMounted) { |
| // Use UUID as stable name, if available |
| std::string stableName = getId(); |
| if (!mFsUuid.empty()) { |
| stableName = mFsUuid; |
| } |
| |
| if (UnmountUserFuse(getMountUserId(), getInternalPath(), stableName) != OK) { |
| PLOG(INFO) << "UnmountUserFuse failed on public fuse volume"; |
| return -errno; |
| } |
| |
| mFuseMounted = false; |
| } |
| |
| ForceUnmount(kAsecPath); |
| |
| if (mUseSdcardFs) { |
| ForceUnmount(mSdcardFsDefault); |
| ForceUnmount(mSdcardFsRead); |
| ForceUnmount(mSdcardFsWrite); |
| ForceUnmount(mSdcardFsFull); |
| |
| rmdir(mSdcardFsDefault.c_str()); |
| rmdir(mSdcardFsRead.c_str()); |
| rmdir(mSdcardFsWrite.c_str()); |
| rmdir(mSdcardFsFull.c_str()); |
| |
| mSdcardFsDefault.clear(); |
| mSdcardFsRead.clear(); |
| mSdcardFsWrite.clear(); |
| mSdcardFsFull.clear(); |
| } |
| ForceUnmount(mRawPath); |
| rmdir(mRawPath.c_str()); |
| mRawPath.clear(); |
| |
| return OK; |
| } |
| |
| status_t PublicVolume::doFormat(const std::string& fsType) { |
| status_t res = OK; |
| |
| status_t (*formatFunction)(const std::string&, unsigned long) = NULL; |
| |
| // Resolve the target filesystem type |
| if (fsType == "auto") { |
| if (exfat::IsSupported() && exfat::CheckSize(mDevPath, true) == 1) { |
| /* Should format filesystem as exFAT, so we must format the |
| * partition according to SDXC rules. */ |
| formatFunction = &exfat::Format; |
| } else if(vfat::IsSupported()) { |
| formatFunction = &vfat::Format; |
| } |
| } else if (fsType == "vfat") { |
| formatFunction = vfat::IsSupported() ? &vfat::Format : NULL; |
| } else if (fsType == "exfat") { |
| formatFunction = exfat::IsSupported() ? &exfat::Format : NULL; |
| } |
| |
| if (!formatFunction) { |
| LOG(ERROR) << "Unsupported filesystem " << fsType; |
| return -EINVAL; |
| } |
| |
| if (WipeBlockDevice(mDevPath) != OK) { |
| LOG(WARNING) << getId() << " failed to wipe"; |
| } |
| |
| res = formatFunction(mDevPath, 0); |
| |
| if (res != OK) { |
| LOG(ERROR) << getId() << " failed to format"; |
| res = -errno; |
| } |
| |
| return res; |
| } |
| |
| } // namespace vold |
| } // namespace android |