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// Copyright (C) 2020 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.
#include <chrono>
#include <string_view>
#include <vector>
#include <android-base/chrono_utils.h>
#include <android-base/logging.h>
#include <android-base/strings.h>
#include <fs_mgr.h>
#include "block_dev_initializer.h"
namespace android {
namespace init {
using android::base::Timer;
using namespace std::chrono_literals;
BlockDevInitializer::BlockDevInitializer() : uevent_listener_(16 * 1024 * 1024) {
auto boot_devices = android::fs_mgr::GetBootDevices();
device_handler_ = std::make_unique<DeviceHandler>(
std::vector<Permissions>{}, std::vector<SysfsPermissions>{}, std::vector<Subsystem>{},
std::move(boot_devices), false);
}
bool BlockDevInitializer::InitDeviceMapper() {
return InitMiscDevice("device-mapper");
}
bool BlockDevInitializer::InitDmUser(const std::string& name) {
return InitMiscDevice("dm-user!" + name);
}
bool BlockDevInitializer::InitMiscDevice(const std::string& name) {
const std::string dm_path = "/devices/virtual/misc/" + name;
bool found = false;
auto dm_callback = [this, &dm_path, &found](const Uevent& uevent) {
if (uevent.path == dm_path) {
device_handler_->HandleUevent(uevent);
found = true;
return ListenerAction::kStop;
}
return ListenerAction::kContinue;
};
uevent_listener_.RegenerateUeventsForPath("/sys" + dm_path, dm_callback);
if (!found) {
LOG(INFO) << name << " device not found in /sys, waiting for its uevent";
Timer t;
uevent_listener_.Poll(dm_callback, 10s);
LOG(INFO) << "Wait for " << name << " returned after " << t;
}
if (!found) {
LOG(ERROR) << name << " device not found after polling timeout";
return false;
}
return true;
}
ListenerAction BlockDevInitializer::HandleUevent(const Uevent& uevent,
std::set<std::string>* devices) {
// Ignore everything that is not a block device.
if (uevent.subsystem != "block") {
return ListenerAction::kContinue;
}
auto name = uevent.partition_name;
if (name.empty()) {
size_t base_idx = uevent.path.rfind('/');
if (base_idx == std::string::npos) {
return ListenerAction::kContinue;
}
name = uevent.path.substr(base_idx + 1);
}
auto iter = devices->find(name);
if (iter == devices->end()) {
return ListenerAction::kContinue;
}
LOG(VERBOSE) << __PRETTY_FUNCTION__ << ": found partition: " << name;
devices->erase(iter);
device_handler_->HandleUevent(uevent);
return devices->empty() ? ListenerAction::kStop : ListenerAction::kContinue;
}
bool BlockDevInitializer::InitDevices(std::set<std::string> devices) {
auto uevent_callback = [&, this](const Uevent& uevent) -> ListenerAction {
return HandleUevent(uevent, &devices);
};
uevent_listener_.RegenerateUevents(uevent_callback);
// UeventCallback() will remove found partitions from |devices|. So if it
// isn't empty here, it means some partitions are not found.
if (!devices.empty()) {
LOG(INFO) << __PRETTY_FUNCTION__
<< ": partition(s) not found in /sys, waiting for their uevent(s): "
<< android::base::Join(devices, ", ");
Timer t;
uevent_listener_.Poll(uevent_callback, 10s);
LOG(INFO) << "Wait for partitions returned after " << t;
}
if (!devices.empty()) {
LOG(ERROR) << __PRETTY_FUNCTION__ << ": partition(s) not found after polling timeout: "
<< android::base::Join(devices, ", ");
return false;
}
return true;
}
// Creates "/dev/block/dm-XX" for dm nodes by running coldboot on /sys/block/dm-XX.
bool BlockDevInitializer::InitDmDevice(const std::string& device) {
const std::string device_name(basename(device.c_str()));
const std::string syspath = "/sys/block/" + device_name;
bool found = false;
auto uevent_callback = [&device_name, &device, this, &found](const Uevent& uevent) {
if (uevent.device_name == device_name) {
LOG(VERBOSE) << "Creating device-mapper device : " << device;
device_handler_->HandleUevent(uevent);
found = true;
return ListenerAction::kStop;
}
return ListenerAction::kContinue;
};
uevent_listener_.RegenerateUeventsForPath(syspath, uevent_callback);
if (!found) {
LOG(INFO) << "dm device '" << device << "' not found in /sys, waiting for its uevent";
Timer t;
uevent_listener_.Poll(uevent_callback, 10s);
LOG(INFO) << "wait for dm device '" << device << "' returned after " << t;
}
if (!found) {
LOG(ERROR) << "dm device '" << device << "' not found after polling timeout";
return false;
}
return true;
}
} // namespace init
} // namespace android
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