blob: 6f450d2f9987eaa8bb1ab6d802afc29b3cad059a [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/disks/disk_mount_manager.h"
#include <map>
#include <set>
#include "base/bind.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/string_util.h"
#include "chromeos/dbus/dbus_thread_manager.h"
namespace chromeos {
namespace disks {
namespace {
const char kDeviceNotFound[] = "Device could not be found";
DiskMountManager* g_disk_mount_manager = NULL;
// The DiskMountManager implementation.
class DiskMountManagerImpl : public DiskMountManager {
public:
DiskMountManagerImpl() : weak_ptr_factory_(this) {
DBusThreadManager* dbus_thread_manager = DBusThreadManager::Get();
DCHECK(dbus_thread_manager);
cros_disks_client_ = dbus_thread_manager->GetCrosDisksClient();
DCHECK(cros_disks_client_);
cros_disks_client_->SetUpConnections(
base::Bind(&DiskMountManagerImpl::OnMountEvent,
weak_ptr_factory_.GetWeakPtr()),
base::Bind(&DiskMountManagerImpl::OnMountCompleted,
weak_ptr_factory_.GetWeakPtr()));
}
virtual ~DiskMountManagerImpl() {
}
// DiskMountManager override.
virtual void AddObserver(Observer* observer) OVERRIDE {
observers_.AddObserver(observer);
}
// DiskMountManager override.
virtual void RemoveObserver(Observer* observer) OVERRIDE {
observers_.RemoveObserver(observer);
}
// DiskMountManager override.
virtual void MountPath(const std::string& source_path,
const std::string& source_format,
const std::string& mount_label,
MountType type) OVERRIDE {
// Hidden and non-existent devices should not be mounted.
if (type == MOUNT_TYPE_DEVICE) {
DiskMap::const_iterator it = disks_.find(source_path);
if (it == disks_.end() || it->second->is_hidden()) {
OnMountCompleted(MOUNT_ERROR_INTERNAL, source_path, type, "");
return;
}
}
cros_disks_client_->Mount(
source_path,
source_format,
mount_label,
type,
// When succeeds, OnMountCompleted will be called by
// "MountCompleted" signal instead.
base::Bind(&base::DoNothing),
base::Bind(&DiskMountManagerImpl::OnMountCompleted,
weak_ptr_factory_.GetWeakPtr(),
MOUNT_ERROR_INTERNAL,
source_path,
type,
""));
}
// DiskMountManager override.
virtual void UnmountPath(const std::string& mount_path,
UnmountOptions options) OVERRIDE {
UnmountChildMounts(mount_path);
cros_disks_client_->Unmount(mount_path, options,
base::Bind(&DiskMountManagerImpl::OnUnmountPath,
weak_ptr_factory_.GetWeakPtr(),
true),
base::Bind(&DiskMountManagerImpl::OnUnmountPath,
weak_ptr_factory_.GetWeakPtr(),
false));
}
// DiskMountManager override.
virtual void FormatUnmountedDevice(const std::string& file_path) OVERRIDE {
for (DiskMountManager::DiskMap::iterator it = disks_.begin();
it != disks_.end(); ++it) {
if (it->second->file_path() == file_path &&
!it->second->mount_path().empty()) {
LOG(ERROR) << "Device is still mounted: " << file_path;
OnFormatDevice(file_path, false);
return;
}
}
const char kFormatVFAT[] = "vfat";
cros_disks_client_->FormatDevice(
file_path,
kFormatVFAT,
base::Bind(&DiskMountManagerImpl::OnFormatDevice,
weak_ptr_factory_.GetWeakPtr()),
base::Bind(&DiskMountManagerImpl::OnFormatDevice,
weak_ptr_factory_.GetWeakPtr(),
file_path,
false));
}
// DiskMountManager override.
virtual void FormatMountedDevice(const std::string& mount_path) OVERRIDE {
Disk* disk = NULL;
for (DiskMountManager::DiskMap::iterator it = disks_.begin();
it != disks_.end(); ++it) {
if (it->second->mount_path() == mount_path) {
disk = it->second;
break;
}
}
if (!disk) {
LOG(ERROR) << "Device with this mount path not found: " << mount_path;
OnFormatDevice(mount_path, false);
return;
}
if (formatting_pending_.find(disk->device_path()) !=
formatting_pending_.end()) {
LOG(ERROR) << "Formatting is already pending: " << mount_path;
OnFormatDevice(mount_path, false);
return;
}
// Formatting process continues, after unmounting.
formatting_pending_[disk->device_path()] = disk->file_path();
UnmountPath(disk->mount_path(), UNMOUNT_OPTIONS_NONE);
}
// DiskMountManager override.
virtual void UnmountDeviceRecursive(
const std::string& device_path,
UnmountDeviceRecursiveCallbackType callback,
void* user_data) OVERRIDE {
bool success = true;
std::string error_message;
std::vector<std::string> devices_to_unmount;
// Get list of all devices to unmount.
int device_path_len = device_path.length();
for (DiskMap::iterator it = disks_.begin(); it != disks_.end(); ++it) {
if (!it->second->mount_path().empty() &&
strncmp(device_path.c_str(), it->second->device_path().c_str(),
device_path_len) == 0) {
devices_to_unmount.push_back(it->second->mount_path());
}
}
// We should detect at least original device.
if (devices_to_unmount.empty()) {
if (disks_.find(device_path) == disks_.end()) {
success = false;
error_message = kDeviceNotFound;
} else {
// Nothing to unmount.
callback(user_data, true);
return;
}
}
if (success) {
// We will send the same callback data object to all Unmount calls and use
// it to syncronize callbacks.
UnmountDeviceRecursiveCallbackData* cb_data =
new UnmountDeviceRecursiveCallbackData(user_data, callback,
devices_to_unmount.size());
for (size_t i = 0; i < devices_to_unmount.size(); ++i) {
cros_disks_client_->Unmount(
devices_to_unmount[i],
UNMOUNT_OPTIONS_NONE,
base::Bind(&DiskMountManagerImpl::OnUnmountDeviceRecursive,
weak_ptr_factory_.GetWeakPtr(), cb_data, true),
base::Bind(&DiskMountManagerImpl::OnUnmountDeviceRecursive,
weak_ptr_factory_.GetWeakPtr(), cb_data, false));
}
} else {
LOG(WARNING) << "Unmount recursive request failed for device "
<< device_path << ", with error: " << error_message;
callback(user_data, false);
}
}
// DiskMountManager override.
virtual void RequestMountInfoRefresh() OVERRIDE {
cros_disks_client_->EnumerateAutoMountableDevices(
base::Bind(&DiskMountManagerImpl::OnRequestMountInfo,
weak_ptr_factory_.GetWeakPtr()),
base::Bind(&base::DoNothing));
}
// DiskMountManager override.
virtual const DiskMap& disks() const OVERRIDE { return disks_; }
// DiskMountManager override.
virtual const Disk* FindDiskBySourcePath(const std::string& source_path)
const OVERRIDE {
DiskMap::const_iterator disk_it = disks_.find(source_path);
return disk_it == disks_.end() ? NULL : disk_it->second;
}
// DiskMountManager override.
virtual const MountPointMap& mount_points() const OVERRIDE {
return mount_points_;
}
private:
struct UnmountDeviceRecursiveCallbackData {
void* user_data;
UnmountDeviceRecursiveCallbackType callback;
size_t pending_callbacks_count;
UnmountDeviceRecursiveCallbackData(void* ud,
UnmountDeviceRecursiveCallbackType cb,
int count)
: user_data(ud),
callback(cb),
pending_callbacks_count(count) {
}
};
// Unmounts all mount points whose source path is transitively parented by
// |mount_path|.
void UnmountChildMounts(const std::string& mount_path_in) {
std::string mount_path = mount_path_in;
// Let's make sure mount path has trailing slash.
if (mount_path[mount_path.length() - 1] != '/')
mount_path += '/';
for (MountPointMap::iterator it = mount_points_.begin();
it != mount_points_.end();
++it) {
if (StartsWithASCII(it->second.source_path, mount_path,
true /*case sensitive*/)) {
UnmountPath(it->second.mount_path, UNMOUNT_OPTIONS_NONE);
}
}
}
// Callback for UnmountDeviceRecursive.
void OnUnmountDeviceRecursive(UnmountDeviceRecursiveCallbackData* cb_data,
bool success,
const std::string& mount_path) {
if (success) {
// Do standard processing for Unmount event.
OnUnmountPath(true, mount_path);
LOG(INFO) << mount_path << " unmounted.";
}
// This is safe as long as all callbacks are called on the same thread as
// UnmountDeviceRecursive.
cb_data->pending_callbacks_count--;
if (cb_data->pending_callbacks_count == 0) {
cb_data->callback(cb_data->user_data, success);
delete cb_data;
}
}
// Callback to handle MountCompleted signal and Mount method call failure.
void OnMountCompleted(MountError error_code,
const std::string& source_path,
MountType mount_type,
const std::string& mount_path) {
MountCondition mount_condition = MOUNT_CONDITION_NONE;
if (mount_type == MOUNT_TYPE_DEVICE) {
if (error_code == MOUNT_ERROR_UNKNOWN_FILESYSTEM) {
mount_condition = MOUNT_CONDITION_UNKNOWN_FILESYSTEM;
}
if (error_code == MOUNT_ERROR_UNSUPPORTED_FILESYSTEM) {
mount_condition = MOUNT_CONDITION_UNSUPPORTED_FILESYSTEM;
}
}
const MountPointInfo mount_info(source_path, mount_path, mount_type,
mount_condition);
NotifyMountCompleted(MOUNTING, error_code, mount_info);
// If the device is corrupted but it's still possible to format it, it will
// be fake mounted.
if ((error_code == MOUNT_ERROR_NONE || mount_info.mount_condition) &&
mount_points_.find(mount_info.mount_path) == mount_points_.end()) {
mount_points_.insert(MountPointMap::value_type(mount_info.mount_path,
mount_info));
}
if ((error_code == MOUNT_ERROR_NONE || mount_info.mount_condition) &&
mount_info.mount_type == MOUNT_TYPE_DEVICE &&
!mount_info.source_path.empty() &&
!mount_info.mount_path.empty()) {
DiskMap::iterator iter = disks_.find(mount_info.source_path);
if (iter == disks_.end()) {
// disk might have been removed by now?
return;
}
Disk* disk = iter->second;
DCHECK(disk);
disk->set_mount_path(mount_info.mount_path);
NotifyDiskStatusUpdate(MOUNT_DISK_MOUNTED, disk);
}
}
// Callback for UnmountPath.
void OnUnmountPath(bool success, const std::string& mount_path) {
MountPointMap::iterator mount_points_it = mount_points_.find(mount_path);
if (mount_points_it == mount_points_.end())
return;
NotifyMountCompleted(
UNMOUNTING,
success ? MOUNT_ERROR_NONE : MOUNT_ERROR_INTERNAL,
MountPointInfo(mount_points_it->second.source_path,
mount_points_it->second.mount_path,
mount_points_it->second.mount_type,
mount_points_it->second.mount_condition));
std::string path(mount_points_it->second.source_path);
if (success)
mount_points_.erase(mount_points_it);
DiskMap::iterator iter = disks_.find(path);
if (iter == disks_.end()) {
// disk might have been removed by now.
return;
}
Disk* disk = iter->second;
DCHECK(disk);
if (success)
disk->clear_mount_path();
// Check if there is a formatting scheduled.
PathMap::iterator it = formatting_pending_.find(disk->device_path());
if (it != formatting_pending_.end()) {
// Copy the string before it gets erased.
const std::string file_path = it->second;
formatting_pending_.erase(it);
if (success) {
FormatUnmountedDevice(file_path);
} else {
OnFormatDevice(file_path, false);
}
}
}
// Callback for FormatDevice.
void OnFormatDevice(const std::string& device_path, bool success) {
if (success) {
NotifyDeviceStatusUpdate(MOUNT_FORMATTING_STARTED, device_path);
} else {
NotifyDeviceStatusUpdate(MOUNT_FORMATTING_STARTED,
std::string("!") + device_path);
LOG(WARNING) << "Format request failed for device " << device_path;
}
}
// Callbcak for GetDeviceProperties.
void OnGetDeviceProperties(const DiskInfo& disk_info) {
// TODO(zelidrag): Find a better way to filter these out before we
// fetch the properties:
// Ignore disks coming from the device we booted the system from.
if (disk_info.on_boot_device())
return;
LOG(WARNING) << "Found disk " << disk_info.device_path();
// Delete previous disk info for this path:
bool is_new = true;
DiskMap::iterator iter = disks_.find(disk_info.device_path());
if (iter != disks_.end()) {
delete iter->second;
disks_.erase(iter);
is_new = false;
}
Disk* disk = new Disk(disk_info.device_path(),
disk_info.mount_path(),
disk_info.system_path(),
disk_info.file_path(),
disk_info.label(),
disk_info.drive_label(),
disk_info.vendor_id(),
disk_info.vendor_name(),
disk_info.product_id(),
disk_info.product_name(),
disk_info.uuid(),
FindSystemPathPrefix(disk_info.system_path()),
disk_info.device_type(),
disk_info.total_size_in_bytes(),
disk_info.is_drive(),
disk_info.is_read_only(),
disk_info.has_media(),
disk_info.on_boot_device(),
disk_info.is_hidden());
disks_.insert(std::make_pair(disk_info.device_path(), disk));
NotifyDiskStatusUpdate(is_new ? MOUNT_DISK_ADDED : MOUNT_DISK_CHANGED,
disk);
}
// Callbcak for RequestMountInfo.
void OnRequestMountInfo(const std::vector<std::string>& devices) {
std::set<std::string> current_device_set;
if (!devices.empty()) {
// Initiate properties fetch for all removable disks,
for (size_t i = 0; i < devices.size(); i++) {
current_device_set.insert(devices[i]);
// Initiate disk property retrieval for each relevant device path.
cros_disks_client_->GetDeviceProperties(
devices[i],
base::Bind(&DiskMountManagerImpl::OnGetDeviceProperties,
weak_ptr_factory_.GetWeakPtr()),
base::Bind(&base::DoNothing));
}
}
// Search and remove disks that are no longer present.
for (DiskMap::iterator iter = disks_.begin(); iter != disks_.end(); ) {
if (current_device_set.find(iter->first) == current_device_set.end()) {
Disk* disk = iter->second;
NotifyDiskStatusUpdate(MOUNT_DISK_REMOVED, disk);
delete iter->second;
disks_.erase(iter++);
} else {
++iter;
}
}
}
// Callback to handle mount event signals.
void OnMountEvent(MountEventType event, const std::string& device_path_arg) {
// Take a copy of the argument so we can modify it below.
std::string device_path = device_path_arg;
DiskMountManagerEventType type = MOUNT_DEVICE_ADDED;
switch (event) {
case DISK_ADDED: {
cros_disks_client_->GetDeviceProperties(
device_path,
base::Bind(&DiskMountManagerImpl::OnGetDeviceProperties,
weak_ptr_factory_.GetWeakPtr()),
base::Bind(&base::DoNothing));
return;
}
case DISK_REMOVED: {
// Search and remove disks that are no longer present.
DiskMountManager::DiskMap::iterator iter = disks_.find(device_path);
if (iter != disks_.end()) {
Disk* disk = iter->second;
NotifyDiskStatusUpdate(MOUNT_DISK_REMOVED, disk);
delete iter->second;
disks_.erase(iter);
}
return;
}
case DEVICE_ADDED: {
type = MOUNT_DEVICE_ADDED;
system_path_prefixes_.insert(device_path);
break;
}
case DEVICE_REMOVED: {
type = MOUNT_DEVICE_REMOVED;
system_path_prefixes_.erase(device_path);
break;
}
case DEVICE_SCANNED: {
type = MOUNT_DEVICE_SCANNED;
break;
}
case FORMATTING_FINISHED: {
// FORMATTING_FINISHED actually returns file path instead of device
// path.
device_path = FilePathToDevicePath(device_path);
if (device_path.empty()) {
LOG(ERROR) << "Error while handling disks metadata. Cannot find "
<< "device that is being formatted.";
return;
}
type = MOUNT_FORMATTING_FINISHED;
break;
}
default: {
LOG(ERROR) << "Unknown event: " << event;
return;
}
}
NotifyDeviceStatusUpdate(type, device_path);
}
// Notifies all observers about disk status update.
void NotifyDiskStatusUpdate(DiskMountManagerEventType event,
const Disk* disk) {
FOR_EACH_OBSERVER(Observer, observers_, DiskChanged(event, disk));
}
// Notifies all observers about device status update.
void NotifyDeviceStatusUpdate(DiskMountManagerEventType event,
const std::string& device_path) {
FOR_EACH_OBSERVER(Observer, observers_, DeviceChanged(event, device_path));
}
// Notifies all observers about mount completion.
void NotifyMountCompleted(MountEvent event_type,
MountError error_code,
const MountPointInfo& mount_info) {
FOR_EACH_OBSERVER(Observer, observers_,
MountCompleted(event_type, error_code, mount_info));
}
// Converts file path to device path.
std::string FilePathToDevicePath(const std::string& file_path) {
// TODO(hashimoto): Refactor error handling code like here.
// Appending "!" is not the best way to indicate error. This kind of trick
// also makes it difficult to simplify the code paths. crosbug.com/22972
const int failed = StartsWithASCII(file_path, "!", true);
for (DiskMountManager::DiskMap::iterator it = disks_.begin();
it != disks_.end(); ++it) {
// Skip the leading '!' on the failure case.
if (it->second->file_path() == file_path.substr(failed)) {
if (failed)
return std::string("!") + it->second->device_path();
else
return it->second->device_path();
}
}
return "";
}
// Finds system path prefix from |system_path|.
const std::string& FindSystemPathPrefix(const std::string& system_path) {
if (system_path.empty())
return EmptyString();
for (SystemPathPrefixSet::const_iterator it = system_path_prefixes_.begin();
it != system_path_prefixes_.end();
++it) {
const std::string& prefix = *it;
if (StartsWithASCII(system_path, prefix, true))
return prefix;
}
return EmptyString();
}
// Mount event change observers.
ObserverList<Observer> observers_;
CrosDisksClient* cros_disks_client_;
// The list of disks found.
DiskMountManager::DiskMap disks_;
DiskMountManager::MountPointMap mount_points_;
typedef std::set<std::string> SystemPathPrefixSet;
SystemPathPrefixSet system_path_prefixes_;
// A map from device path (e.g. /sys/devices/pci0000:00/.../sdb/sdb1)) to file
// path (e.g. /dev/sdb).
// Devices in this map are supposed to be formatted, but are currently waiting
// to be unmounted. When device is in this map, the formatting process HAVEN'T
// started yet.
typedef std::map<std::string, std::string> PathMap;
PathMap formatting_pending_;
base::WeakPtrFactory<DiskMountManagerImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(DiskMountManagerImpl);
};
} // namespace
DiskMountManager::Disk::Disk(const std::string& device_path,
const std::string& mount_path,
const std::string& system_path,
const std::string& file_path,
const std::string& device_label,
const std::string& drive_label,
const std::string& vendor_id,
const std::string& vendor_name,
const std::string& product_id,
const std::string& product_name,
const std::string& fs_uuid,
const std::string& system_path_prefix,
DeviceType device_type,
uint64 total_size_in_bytes,
bool is_parent,
bool is_read_only,
bool has_media,
bool on_boot_device,
bool is_hidden)
: device_path_(device_path),
mount_path_(mount_path),
system_path_(system_path),
file_path_(file_path),
device_label_(device_label),
drive_label_(drive_label),
vendor_id_(vendor_id),
vendor_name_(vendor_name),
product_id_(product_id),
product_name_(product_name),
fs_uuid_(fs_uuid),
system_path_prefix_(system_path_prefix),
device_type_(device_type),
total_size_in_bytes_(total_size_in_bytes),
is_parent_(is_parent),
is_read_only_(is_read_only),
has_media_(has_media),
on_boot_device_(on_boot_device),
is_hidden_(is_hidden) {
}
DiskMountManager::Disk::~Disk() {}
// static
std::string DiskMountManager::MountTypeToString(MountType type) {
switch (type) {
case MOUNT_TYPE_DEVICE:
return "device";
case MOUNT_TYPE_ARCHIVE:
return "file";
case MOUNT_TYPE_NETWORK_STORAGE:
return "network";
case MOUNT_TYPE_GDATA:
return "gdata";
case MOUNT_TYPE_INVALID:
return "invalid";
default:
NOTREACHED();
}
return "";
}
// static
std::string DiskMountManager::MountConditionToString(MountCondition condition) {
switch (condition) {
case MOUNT_CONDITION_NONE:
return "";
case MOUNT_CONDITION_UNKNOWN_FILESYSTEM:
return "unknown_filesystem";
case MOUNT_CONDITION_UNSUPPORTED_FILESYSTEM:
return "unsupported_filesystem";
default:
NOTREACHED();
}
return "";
}
// static
MountType DiskMountManager::MountTypeFromString(const std::string& type_str) {
if (type_str == "device")
return MOUNT_TYPE_DEVICE;
else if (type_str == "network")
return MOUNT_TYPE_NETWORK_STORAGE;
else if (type_str == "file")
return MOUNT_TYPE_ARCHIVE;
else if (type_str == "gdata")
return MOUNT_TYPE_GDATA;
else
return MOUNT_TYPE_INVALID;
}
// static
std::string DiskMountManager::DeviceTypeToString(DeviceType type) {
switch (type) {
case DEVICE_TYPE_USB:
return "usb";
case DEVICE_TYPE_SD:
return "sd";
case DEVICE_TYPE_OPTICAL_DISC:
return "optical";
case DEVICE_TYPE_MOBILE:
return "mobile";
default:
return "unknown";
}
}
// static
void DiskMountManager::Initialize() {
if (g_disk_mount_manager) {
LOG(WARNING) << "DiskMountManager was already initialized";
return;
}
g_disk_mount_manager = new DiskMountManagerImpl();
VLOG(1) << "DiskMountManager initialized";
}
// static
void DiskMountManager::InitializeForTesting(
DiskMountManager* disk_mount_manager) {
if (g_disk_mount_manager) {
LOG(WARNING) << "DiskMountManager was already initialized";
return;
}
g_disk_mount_manager = disk_mount_manager;
VLOG(1) << "DiskMountManager initialized";
}
// static
void DiskMountManager::Shutdown() {
if (!g_disk_mount_manager) {
LOG(WARNING) << "DiskMountManager::Shutdown() called with NULL manager";
return;
}
delete g_disk_mount_manager;
g_disk_mount_manager = NULL;
VLOG(1) << "DiskMountManager Shutdown completed";
}
// static
DiskMountManager* DiskMountManager::GetInstance() {
return g_disk_mount_manager;
}
} // namespace disks
} // namespace chromeos