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platform_system_vold/VolumeManager.cpp
Zim a438b24368 Fix multi-user and multi-storage with FUSE 
Up until now, the FUSE mount logic has made two assumptions:
1. The primary external volume is an emulated volume on /data/media
2. Only the primary user is running, as user zero

These assumptions are fixed by the following changes
creating an EmulatedVolume per Android user and changing the
VolumeBase id format to append the user to the id, so
s/emulated/emulated-0/. This allows us mount separate volumes per user

Some additional refactorings to re-use/clean up code.

Test: adb shell sm set-virtual-disk and partition disk operations work
even after setting up a work profile
Bug: 135341433

Change-Id: Ifabaa12368e5a591fbcdce4ee71c83ff35fdac6b
2019-11-11 20:24:49 +00:00

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/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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.
*/
#define ATRACE_TAG ATRACE_TAG_PACKAGE_MANAGER
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <mntent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <array>
#include <linux/kdev_t.h>
#include <ApexProperties.sysprop.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <cutils/fs.h>
#include <utils/Trace.h>
#include <selinux/android.h>
#include <sysutils/NetlinkEvent.h>
#include <private/android_filesystem_config.h>
#include <fscrypt/fscrypt.h>
#include "AppFuseUtil.h"
#include "Devmapper.h"
#include "FsCrypt.h"
#include "Loop.h"
#include "NetlinkManager.h"
#include "Process.h"
#include "Utils.h"
#include "VoldNativeService.h"
#include "VoldUtil.h"
#include "VolumeManager.h"
#include "cryptfs.h"
#include "fs/Ext4.h"
#include "fs/Vfat.h"
#include "model/EmulatedVolume.h"
#include "model/ObbVolume.h"
#include "model/PrivateVolume.h"
#include "model/StubVolume.h"
using android::OK;
using android::base::GetBoolProperty;
using android::base::StartsWith;
using android::base::StringAppendF;
using android::base::StringPrintf;
using android::base::unique_fd;
using android::vold::BindMount;
using android::vold::CreateDir;
using android::vold::DeleteDirContents;
using android::vold::DeleteDirContentsAndDir;
using android::vold::PrivateVolume;
using android::vold::Symlink;
using android::vold::Unlink;
using android::vold::UnmountTree;
using android::vold::VoldNativeService;
using android::vold::VolumeBase;
static const char* kPathUserMount = "/mnt/user";
static const char* kPathVirtualDisk = "/data/misc/vold/virtual_disk";
static const char* kPropVirtualDisk = "persist.sys.virtual_disk";
static const std::string kEmptyString("");
/* 512MiB is large enough for testing purposes */
static const unsigned int kSizeVirtualDisk = 536870912;
static const unsigned int kMajorBlockMmc = 179;
static const unsigned int kMajorBlockExperimentalMin = 240;
static const unsigned int kMajorBlockExperimentalMax = 254;
VolumeManager* VolumeManager::sInstance = NULL;
VolumeManager* VolumeManager::Instance() {
if (!sInstance) sInstance = new VolumeManager();
return sInstance;
}
VolumeManager::VolumeManager() {
mDebug = false;
mNextObbId = 0;
mNextStubVolumeId = 0;
// For security reasons, assume that a secure keyguard is
// showing until we hear otherwise
mSecureKeyguardShowing = true;
}
VolumeManager::~VolumeManager() {}
int VolumeManager::updateVirtualDisk() {
ATRACE_NAME("VolumeManager::updateVirtualDisk");
if (GetBoolProperty(kPropVirtualDisk, false)) {
if (access(kPathVirtualDisk, F_OK) != 0) {
Loop::createImageFile(kPathVirtualDisk, kSizeVirtualDisk / 512);
}
if (mVirtualDisk == nullptr) {
if (Loop::create(kPathVirtualDisk, mVirtualDiskPath) != 0) {
LOG(ERROR) << "Failed to create virtual disk";
return -1;
}
struct stat buf;
if (stat(mVirtualDiskPath.c_str(), &buf) < 0) {
PLOG(ERROR) << "Failed to stat " << mVirtualDiskPath;
return -1;
}
auto disk = new android::vold::Disk(
"virtual", buf.st_rdev, "virtual",
android::vold::Disk::Flags::kAdoptable | android::vold::Disk::Flags::kSd);
mVirtualDisk = std::shared_ptr<android::vold::Disk>(disk);
handleDiskAdded(mVirtualDisk);
}
} else {
if (mVirtualDisk != nullptr) {
dev_t device = mVirtualDisk->getDevice();
handleDiskRemoved(device);
Loop::destroyByDevice(mVirtualDiskPath.c_str());
mVirtualDisk = nullptr;
}
if (access(kPathVirtualDisk, F_OK) == 0) {
unlink(kPathVirtualDisk);
}
}
return 0;
}
int VolumeManager::setDebug(bool enable) {
mDebug = enable;
return 0;
}
int VolumeManager::start() {
ATRACE_NAME("VolumeManager::start");
// Always start from a clean slate by unmounting everything in
// directories that we own, in case we crashed.
unmountAll();
Devmapper::destroyAll();
Loop::destroyAll();
// Assume that we always have an emulated volume on internal
// storage; the framework will decide if it should be mounted.
CHECK(mInternalEmulatedVolumes.empty());
auto vol = std::shared_ptr<android::vold::VolumeBase>(
new android::vold::EmulatedVolume("/data/media", 0));
vol->setMountUserId(0);
vol->create();
mInternalEmulatedVolumes.push_back(vol);
// Consider creating a virtual disk
updateVirtualDisk();
return 0;
}
int VolumeManager::stop() {
CHECK(!mInternalEmulatedVolumes.empty());
for (const auto& vol : mInternalEmulatedVolumes) {
vol->destroy();
}
mInternalEmulatedVolumes.clear();
return 0;
}
void VolumeManager::handleBlockEvent(NetlinkEvent* evt) {
std::lock_guard<std::mutex> lock(mLock);
if (mDebug) {
LOG(DEBUG) << "----------------";
LOG(DEBUG) << "handleBlockEvent with action " << (int)evt->getAction();
evt->dump();
}
std::string eventPath(evt->findParam("DEVPATH") ? evt->findParam("DEVPATH") : "");
std::string devType(evt->findParam("DEVTYPE") ? evt->findParam("DEVTYPE") : "");
if (devType != "disk") return;
int major = std::stoi(evt->findParam("MAJOR"));
int minor = std::stoi(evt->findParam("MINOR"));
dev_t device = makedev(major, minor);
switch (evt->getAction()) {
case NetlinkEvent::Action::kAdd: {
for (const auto& source : mDiskSources) {
if (source->matches(eventPath)) {
// For now, assume that MMC and virtio-blk (the latter is
// emulator-specific; see Disk.cpp for details) devices are SD,
// and that everything else is USB
int flags = source->getFlags();
if (major == kMajorBlockMmc || (android::vold::IsRunningInEmulator() &&
major >= (int)kMajorBlockExperimentalMin &&
major <= (int)kMajorBlockExperimentalMax)) {
flags |= android::vold::Disk::Flags::kSd;
} else {
flags |= android::vold::Disk::Flags::kUsb;
}
auto disk =
new android::vold::Disk(eventPath, device, source->getNickname(), flags);
handleDiskAdded(std::shared_ptr<android::vold::Disk>(disk));
break;
}
}
break;
}
case NetlinkEvent::Action::kChange: {
LOG(DEBUG) << "Disk at " << major << ":" << minor << " changed";
handleDiskChanged(device);
break;
}
case NetlinkEvent::Action::kRemove: {
handleDiskRemoved(device);
break;
}
default: {
LOG(WARNING) << "Unexpected block event action " << (int)evt->getAction();
break;
}
}
}
void VolumeManager::handleDiskAdded(const std::shared_ptr<android::vold::Disk>& disk) {
// For security reasons, if secure keyguard is showing, wait
// until the user unlocks the device to actually touch it
if (mSecureKeyguardShowing) {
LOG(INFO) << "Found disk at " << disk->getEventPath()
<< " but delaying scan due to secure keyguard";
mPendingDisks.push_back(disk);
} else {
disk->create();
mDisks.push_back(disk);
}
}
void VolumeManager::handleDiskChanged(dev_t device) {
for (const auto& disk : mDisks) {
if (disk->getDevice() == device) {
disk->readMetadata();
disk->readPartitions();
}
}
// For security reasons, we ignore all pending disks, since
// we'll scan them once the device is unlocked
}
void VolumeManager::handleDiskRemoved(dev_t device) {
auto i = mDisks.begin();
while (i != mDisks.end()) {
if ((*i)->getDevice() == device) {
(*i)->destroy();
i = mDisks.erase(i);
} else {
++i;
}
}
auto j = mPendingDisks.begin();
while (j != mPendingDisks.end()) {
if ((*j)->getDevice() == device) {
j = mPendingDisks.erase(j);
} else {
++j;
}
}
}
void VolumeManager::addDiskSource(const std::shared_ptr<DiskSource>& diskSource) {
std::lock_guard<std::mutex> lock(mLock);
mDiskSources.push_back(diskSource);
}
std::shared_ptr<android::vold::Disk> VolumeManager::findDisk(const std::string& id) {
for (auto disk : mDisks) {
if (disk->getId() == id) {
return disk;
}
}
return nullptr;
}
std::shared_ptr<android::vold::VolumeBase> VolumeManager::findVolume(const std::string& id) {
for (const auto& vol : mInternalEmulatedVolumes) {
if (vol->getId() == id) {
return vol;
}
}
for (const auto& disk : mDisks) {
auto vol = disk->findVolume(id);
if (vol != nullptr) {
return vol;
}
}
for (const auto& vol : mStubVolumes) {
if (vol->getId() == id) {
return vol;
}
}
for (const auto& vol : mObbVolumes) {
if (vol->getId() == id) {
return vol;
}
}
return nullptr;
}
void VolumeManager::listVolumes(android::vold::VolumeBase::Type type,
std::list<std::string>& list) const {
list.clear();
for (const auto& disk : mDisks) {
disk->listVolumes(type, list);
}
}
int VolumeManager::forgetPartition(const std::string& partGuid, const std::string& fsUuid) {
std::string normalizedGuid;
if (android::vold::NormalizeHex(partGuid, normalizedGuid)) {
LOG(WARNING) << "Invalid GUID " << partGuid;
return -1;
}
bool success = true;
std::string keyPath = android::vold::BuildKeyPath(normalizedGuid);
if (unlink(keyPath.c_str()) != 0) {
LOG(ERROR) << "Failed to unlink " << keyPath;
success = false;
}
if (fscrypt_is_native()) {
if (!fscrypt_destroy_volume_keys(fsUuid)) {
success = false;
}
}
return success ? 0 : -1;
}
int VolumeManager::linkPrimary(userid_t userId) {
if (!GetBoolProperty(android::vold::kPropFuseSnapshot, false)) {
std::string source(mPrimary->getPath());
if (mPrimary->isEmulated()) {
source = StringPrintf("%s/%d", source.c_str(), userId);
fs_prepare_dir(source.c_str(), 0755, AID_ROOT, AID_ROOT);
}
std::string target(StringPrintf("/mnt/user/%d/primary", userId));
LOG(DEBUG) << "Linking " << source << " to " << target;
Symlink(source, target);
}
return 0;
}
void VolumeManager::destroyEmulatedVolumesForUser(userid_t userId) {
// Destroy and remove all unstacked EmulatedVolumes for the user
auto i = mInternalEmulatedVolumes.begin();
while (i != mInternalEmulatedVolumes.end()) {
auto vol = *i;
if (vol->getMountUserId() == userId) {
vol->destroy();
i = mInternalEmulatedVolumes.erase(i);
} else {
i++;
}
}
// Destroy and remove all stacked EmulatedVolumes for the user on each mounted private volume
std::list<std::string> private_vols;
listVolumes(VolumeBase::Type::kPrivate, private_vols);
for (const std::string& id : private_vols) {
PrivateVolume* pvol = static_cast<PrivateVolume*>(findVolume(id).get());
std::list<std::shared_ptr<VolumeBase>> vols_to_remove;
if (pvol->getState() == VolumeBase::State::kMounted) {
for (const auto& vol : pvol->getVolumes()) {
if (vol->getMountUserId() == userId) {
vols_to_remove.push_back(vol);
}
}
for (const auto& vol : vols_to_remove) {
vol->destroy();
pvol->removeVolume(vol);
}
} // else EmulatedVolumes will be destroyed on VolumeBase#unmount
}
}
void VolumeManager::createEmulatedVolumesForUser(userid_t userId) {
// Create unstacked EmulatedVolumes for the user
auto vol = std::shared_ptr<android::vold::VolumeBase>(
new android::vold::EmulatedVolume("/data/media", userId));
vol->setMountUserId(userId);
mInternalEmulatedVolumes.push_back(vol);
vol->create();
// Create stacked EmulatedVolumes for the user on each PrivateVolume
std::list<std::string> private_vols;
listVolumes(VolumeBase::Type::kPrivate, private_vols);
for (const std::string& id : private_vols) {
PrivateVolume* pvol = static_cast<PrivateVolume*>(findVolume(id).get());
if (pvol->getState() == VolumeBase::State::kMounted) {
auto evol =
std::shared_ptr<android::vold::VolumeBase>(new android::vold::EmulatedVolume(
pvol->getPath() + "/media", pvol->getRawDevice(), pvol->getFsUuid(),
userId));
evol->setMountUserId(userId);
pvol->addVolume(evol);
evol->create();
} // else EmulatedVolumes will be created per user when on PrivateVolume#doMount
}
}
int VolumeManager::onUserAdded(userid_t userId, int userSerialNumber) {
LOG(INFO) << "onUserAdded: " << userId;
mAddedUsers[userId] = userSerialNumber;
return 0;
}
int VolumeManager::onUserRemoved(userid_t userId) {
LOG(INFO) << "onUserRemoved: " << userId;
if (GetBoolProperty(android::vold::kPropFuseSnapshot, false) &&
mAddedUsers.find(userId) != mAddedUsers.end()) {
destroyEmulatedVolumesForUser(userId);
}
mAddedUsers.erase(userId);
mStartedUsers.erase(userId);
return 0;
}
int VolumeManager::onUserStarted(userid_t userId) {
LOG(INFO) << "onUserStarted: " << userId;
if (GetBoolProperty(android::vold::kPropFuseSnapshot, false)) {
if (mStartedUsers.find(userId) == mStartedUsers.end()) {
createEmulatedVolumesForUser(userId);
}
} else {
// Note that sometimes the system will spin up processes from Zygote
// before actually starting the user, so we're okay if Zygote
// already created this directory.
std::string path(StringPrintf("%s/%d", kPathUserMount, userId));
fs_prepare_dir(path.c_str(), 0755, AID_ROOT, AID_ROOT);
if (mPrimary) {
linkPrimary(userId);
}
}
mStartedUsers.insert(userId);
return 0;
}
int VolumeManager::onUserStopped(userid_t userId) {
LOG(VERBOSE) << "onUserStopped: " << userId;
if (GetBoolProperty(android::vold::kPropFuseSnapshot, false) &&
mStartedUsers.find(userId) != mStartedUsers.end()) {
destroyEmulatedVolumesForUser(userId);
}
mStartedUsers.erase(userId);
return 0;
}
int VolumeManager::onSecureKeyguardStateChanged(bool isShowing) {
mSecureKeyguardShowing = isShowing;
if (!mSecureKeyguardShowing) {
// Now that secure keyguard has been dismissed, process
// any pending disks
for (const auto& disk : mPendingDisks) {
disk->create();
mDisks.push_back(disk);
}
mPendingDisks.clear();
}
return 0;
}
int VolumeManager::setPrimary(const std::shared_ptr<android::vold::VolumeBase>& vol) {
mPrimary = vol;
for (userid_t userId : mStartedUsers) {
linkPrimary(userId);
}
return 0;
}
int VolumeManager::remountUid(uid_t uid, int32_t mountMode) {
if (GetBoolProperty(android::vold::kPropFuseSnapshot, false)) {
// TODO(135341433): Implement fuse specific logic.
return 0;
}
std::string mode;
switch (mountMode) {
case VoldNativeService::REMOUNT_MODE_NONE:
mode = "none";
break;
case VoldNativeService::REMOUNT_MODE_DEFAULT:
mode = "default";
break;
case VoldNativeService::REMOUNT_MODE_READ:
mode = "read";
break;
case VoldNativeService::REMOUNT_MODE_WRITE:
case VoldNativeService::REMOUNT_MODE_LEGACY:
case VoldNativeService::REMOUNT_MODE_INSTALLER:
mode = "write";
break;
case VoldNativeService::REMOUNT_MODE_FULL:
mode = "full";
break;
case VoldNativeService::REMOUNT_MODE_PASS_THROUGH:
mode = "pass_through";
break;
default:
PLOG(ERROR) << "Unknown mode " << std::to_string(mountMode);
return -1;
}
LOG(DEBUG) << "Remounting " << uid << " as mode " << mode;
DIR* dir;
struct dirent* de;
std::string rootName;
std::string pidName;
int pidFd;
int nsFd;
struct stat sb;
pid_t child;
static bool apexUpdatable = android::sysprop::ApexProperties::updatable().value_or(false);
if (!(dir = opendir("/proc"))) {
PLOG(ERROR) << "Failed to opendir";
return -1;
}
// Figure out root namespace to compare against below
if (!android::vold::Readlinkat(dirfd(dir), "1/ns/mnt", &rootName)) {
PLOG(ERROR) << "Failed to read root namespace";
closedir(dir);
return -1;
}
// Poke through all running PIDs look for apps running as UID
while ((de = readdir(dir))) {
pid_t pid;
if (de->d_type != DT_DIR) continue;
if (!android::base::ParseInt(de->d_name, &pid)) continue;
pidFd = -1;
nsFd = -1;
pidFd = openat(dirfd(dir), de->d_name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
if (pidFd < 0) {
goto next;
}
if (fstat(pidFd, &sb) != 0) {
PLOG(WARNING) << "Failed to stat " << de->d_name;
goto next;
}
if (sb.st_uid != uid) {
goto next;
}
// Matches so far, but refuse to touch if in root namespace
LOG(DEBUG) << "Found matching PID " << de->d_name;
if (!android::vold::Readlinkat(pidFd, "ns/mnt", &pidName)) {
PLOG(WARNING) << "Failed to read namespace for " << de->d_name;
goto next;
}
if (rootName == pidName) {
LOG(WARNING) << "Skipping due to root namespace";
goto next;
}
if (apexUpdatable) {
std::string exeName;
// When ro.apex.bionic_updatable is set to true,
// some early native processes have mount namespaces that are different
// from that of the init. Therefore, above check can't filter them out.
// Since the propagation type of / is 'shared', unmounting /storage
// for the early native processes affects other processes including
// init. Filter out such processes by skipping if a process is a
// non-Java process whose UID is < AID_APP_START. (The UID condition
// is required to not filter out child processes spawned by apps.)
if (!android::vold::Readlinkat(pidFd, "exe", &exeName)) {
PLOG(WARNING) << "Failed to read exe name for " << de->d_name;
goto next;
}
if (!StartsWith(exeName, "/system/bin/app_process") && sb.st_uid < AID_APP_START) {
LOG(WARNING) << "Skipping due to native system process";
goto next;
}
}
// We purposefully leave the namespace open across the fork
// NOLINTNEXTLINE(android-cloexec-open): Deliberately not O_CLOEXEC
nsFd = openat(pidFd, "ns/mnt", O_RDONLY);
if (nsFd < 0) {
PLOG(WARNING) << "Failed to open namespace for " << de->d_name;
goto next;
}
if (!(child = fork())) {
if (setns(nsFd, CLONE_NEWNS) != 0) {
PLOG(ERROR) << "Failed to setns for " << de->d_name;
_exit(1);
}
android::vold::UnmountTree("/storage/");
std::string storageSource;
if (mode == "default") {
storageSource = "/mnt/runtime/default";
} else if (mode == "read") {
storageSource = "/mnt/runtime/read";
} else if (mode == "write") {
storageSource = "/mnt/runtime/write";
} else if (mode == "full") {
storageSource = "/mnt/runtime/full";
} else {
// Sane default of no storage visible
_exit(0);
}
if (TEMP_FAILURE_RETRY(
mount(storageSource.c_str(), "/storage", NULL, MS_BIND | MS_REC, NULL)) == -1) {
PLOG(ERROR) << "Failed to mount " << storageSource << " for " << de->d_name;
_exit(1);
}
if (TEMP_FAILURE_RETRY(mount(NULL, "/storage", NULL, MS_REC | MS_SLAVE, NULL)) == -1) {
PLOG(ERROR) << "Failed to set MS_SLAVE to /storage for " << de->d_name;
_exit(1);
}
// Mount user-specific symlink helper into place
userid_t user_id = multiuser_get_user_id(uid);
std::string userSource(StringPrintf("/mnt/user/%d", user_id));
if (TEMP_FAILURE_RETRY(
mount(userSource.c_str(), "/storage/self", NULL, MS_BIND, NULL)) == -1) {
PLOG(ERROR) << "Failed to mount " << userSource << " for " << de->d_name;
_exit(1);
}
_exit(0);
}
if (child == -1) {
PLOG(ERROR) << "Failed to fork";
goto next;
} else {
TEMP_FAILURE_RETRY(waitpid(child, nullptr, 0));
}
next:
close(nsFd);
close(pidFd);
}
closedir(dir);
return 0;
}
int VolumeManager::reset() {
// Tear down all existing disks/volumes and start from a blank slate so
// newly connected framework hears all events.
for (const auto& vol : mInternalEmulatedVolumes) {
vol->destroy();
}
mInternalEmulatedVolumes.clear();
// Add user 0 cos it's always running and started
auto vol = std::shared_ptr<android::vold::VolumeBase>(
new android::vold::EmulatedVolume("/data/media", 0));
vol->setMountUserId(0);
vol->create();
mInternalEmulatedVolumes.push_back(vol);
for (const auto& disk : mDisks) {
disk->destroy();
disk->create();
}
updateVirtualDisk();
mAddedUsers.clear();
mStartedUsers.clear();
mStartedUsers.insert(0);
return 0;
}
// Can be called twice (sequentially) during shutdown. should be safe for that.
int VolumeManager::shutdown() {
if (mInternalEmulatedVolumes.empty()) {
return 0; // already shutdown
}
android::vold::sSleepOnUnmount = false;
for (const auto& vol : mInternalEmulatedVolumes) {
vol->destroy();
}
for (const auto& disk : mDisks) {
disk->destroy();
}
mInternalEmulatedVolumes.clear();
mStubVolumes.clear();
mDisks.clear();
mPendingDisks.clear();
android::vold::sSleepOnUnmount = true;
return 0;
}
int VolumeManager::unmountAll() {
std::lock_guard<std::mutex> lock(mLock);
ATRACE_NAME("VolumeManager::unmountAll()");
// First, try gracefully unmounting all known devices
for (const auto& vol : mInternalEmulatedVolumes) {
vol->unmount();
}
for (const auto& stub : mStubVolumes) {
stub->unmount();
}
for (const auto& disk : mDisks) {
disk->unmountAll();
}
// Worst case we might have some stale mounts lurking around, so
// force unmount those just to be safe.
FILE* fp = setmntent("/proc/mounts", "re");
if (fp == NULL) {
PLOG(ERROR) << "Failed to open /proc/mounts";
return -errno;
}
// Some volumes can be stacked on each other, so force unmount in
// reverse order to give us the best chance of success.
std::list<std::string> toUnmount;
mntent* mentry;
while ((mentry = getmntent(fp)) != NULL) {
auto test = std::string(mentry->mnt_dir);
if ((StartsWith(test, "/mnt/") &&
#ifdef __ANDROID_DEBUGGABLE__
!StartsWith(test, "/mnt/scratch") &&
#endif
!StartsWith(test, "/mnt/vendor") && !StartsWith(test, "/mnt/product")) ||
StartsWith(test, "/storage/")) {
toUnmount.push_front(test);
}
}
endmntent(fp);
for (const auto& path : toUnmount) {
LOG(DEBUG) << "Tearing down stale mount " << path;
android::vold::ForceUnmount(path);
}
return 0;
}
int VolumeManager::mkdirs(const std::string& path) {
// Only offer to create directories for paths managed by vold
if (StartsWith(path, "/storage/")) {
// fs_mkdirs() does symlink checking and relative path enforcement
return fs_mkdirs(path.c_str(), 0700);
} else {
LOG(ERROR) << "Failed to find mounted volume for " << path;
return -EINVAL;
}
}
int VolumeManager::createObb(const std::string& sourcePath, const std::string& sourceKey,
int32_t ownerGid, std::string* outVolId) {
int id = mNextObbId++;
auto vol = std::shared_ptr<android::vold::VolumeBase>(
new android::vold::ObbVolume(id, sourcePath, sourceKey, ownerGid));
vol->create();
mObbVolumes.push_back(vol);
*outVolId = vol->getId();
return android::OK;
}
int VolumeManager::destroyObb(const std::string& volId) {
auto i = mObbVolumes.begin();
while (i != mObbVolumes.end()) {
if ((*i)->getId() == volId) {
(*i)->destroy();
i = mObbVolumes.erase(i);
} else {
++i;
}
}
return android::OK;
}
int VolumeManager::createStubVolume(const std::string& sourcePath, const std::string& mountPath,
const std::string& fsType, const std::string& fsUuid,
const std::string& fsLabel, std::string* outVolId) {
int id = mNextStubVolumeId++;
auto vol = std::shared_ptr<android::vold::VolumeBase>(
new android::vold::StubVolume(id, sourcePath, mountPath, fsType, fsUuid, fsLabel));
vol->create();
mStubVolumes.push_back(vol);
*outVolId = vol->getId();
return android::OK;
}
int VolumeManager::destroyStubVolume(const std::string& volId) {
auto i = mStubVolumes.begin();
while (i != mStubVolumes.end()) {
if ((*i)->getId() == volId) {
(*i)->destroy();
i = mStubVolumes.erase(i);
} else {
++i;
}
}
return android::OK;
}
int VolumeManager::mountAppFuse(uid_t uid, int mountId, unique_fd* device_fd) {
return android::vold::MountAppFuse(uid, mountId, device_fd);
}
int VolumeManager::unmountAppFuse(uid_t uid, int mountId) {
return android::vold::UnmountAppFuse(uid, mountId);
}
int VolumeManager::openAppFuseFile(uid_t uid, int mountId, int fileId, int flags) {
return android::vold::OpenAppFuseFile(uid, mountId, fileId, flags);
}
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