Merge changes I99f292a0,I6a0f13d5,I2bf3bebf into rvc-dev
* changes:
init: Forcefully mount system_ext on DAP devices if not present in fstab.
init: Factor out first-stage uevent handling into a separate class.
init: Remove special-case hacks for the super partition.
diff --git a/init/Android.bp b/init/Android.bp
index d2bdf98..9053c39 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -36,6 +36,7 @@
"util.cpp",
]
init_device_sources = [
+ "block_dev_initializer.cpp",
"bootchart.cpp",
"builtins.cpp",
"devices.cpp",
diff --git a/init/Android.mk b/init/Android.mk
index 207b5e7..b49fb3b 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -48,6 +48,7 @@
include $(CLEAR_VARS)
LOCAL_CPPFLAGS := $(init_cflags)
LOCAL_SRC_FILES := \
+ block_dev_initializer.cpp \
devices.cpp \
first_stage_init.cpp \
first_stage_main.cpp \
diff --git a/init/block_dev_initializer.cpp b/init/block_dev_initializer.cpp
new file mode 100644
index 0000000..b423f86
--- /dev/null
+++ b/init/block_dev_initializer.cpp
@@ -0,0 +1,148 @@
+// 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() {
+ const std::string dm_path = "/devices/virtual/misc/device-mapper";
+ 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) << "device-mapper device not found in /sys, waiting for its uevent";
+ Timer t;
+ uevent_listener_.Poll(dm_callback, 10s);
+ LOG(INFO) << "Wait for device-mapper returned after " << t;
+ }
+ if (!found) {
+ LOG(ERROR) << "device-mapper 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
diff --git a/init/block_dev_initializer.h b/init/block_dev_initializer.h
new file mode 100644
index 0000000..0d4c6e9
--- /dev/null
+++ b/init/block_dev_initializer.h
@@ -0,0 +1,41 @@
+// 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 <memory>
+#include <set>
+#include <string>
+
+#include "devices.h"
+#include "uevent_listener.h"
+
+namespace android {
+namespace init {
+
+class BlockDevInitializer final {
+ public:
+ BlockDevInitializer();
+
+ bool InitDeviceMapper();
+ bool InitDevices(std::set<std::string> devices);
+ bool InitDmDevice(const std::string& device);
+
+ private:
+ ListenerAction HandleUevent(const Uevent& uevent, std::set<std::string>* devices);
+
+ std::unique_ptr<DeviceHandler> device_handler_;
+ UeventListener uevent_listener_;
+};
+
+} // namespace init
+} // namespace android
diff --git a/init/first_stage_mount.cpp b/init/first_stage_mount.cpp
index 622e457..8eb2f97 100644
--- a/init/first_stage_mount.cpp
+++ b/init/first_stage_mount.cpp
@@ -42,6 +42,7 @@
#include <liblp/liblp.h>
#include <libsnapshot/snapshot.h>
+#include "block_dev_initializer.h"
#include "devices.h"
#include "switch_root.h"
#include "uevent.h"
@@ -84,11 +85,7 @@
bool InitDevices();
protected:
- ListenerAction HandleBlockDevice(const std::string& name, const Uevent&,
- std::set<std::string>* required_devices);
bool InitRequiredDevices(std::set<std::string> devices);
- bool InitMappedDevice(const std::string& verity_device);
- bool InitDeviceMapper();
bool CreateLogicalPartitions();
bool MountPartition(const Fstab::iterator& begin, bool erase_same_mounts,
Fstab::iterator* end = nullptr);
@@ -97,7 +94,7 @@
bool TrySwitchSystemAsRoot();
bool TrySkipMountingPartitions();
bool IsDmLinearEnabled();
- void GetDmLinearMetadataDevice(std::set<std::string>* devices);
+ void GetSuperDeviceName(std::set<std::string>* devices);
bool InitDmLinearBackingDevices(const android::fs_mgr::LpMetadata& metadata);
void UseDsuIfPresent();
// Reads all fstab.avb_keys from the ramdisk for first-stage mount.
@@ -106,8 +103,6 @@
// revocation check by DSU installation service.
void CopyDsuAvbKeys();
- ListenerAction UeventCallback(const Uevent& uevent, std::set<std::string>* required_devices);
-
// Pure virtual functions.
virtual bool GetDmVerityDevices(std::set<std::string>* devices) = 0;
virtual bool SetUpDmVerity(FstabEntry* fstab_entry) = 0;
@@ -116,10 +111,10 @@
bool dsu_not_on_userdata_ = false;
Fstab fstab_;
- std::string lp_metadata_partition_;
+ // The super path is only set after InitDevices, and is invalid before.
+ std::string super_path_;
std::string super_partition_name_;
- std::unique_ptr<DeviceHandler> device_handler_;
- UeventListener uevent_listener_;
+ BlockDevInitializer block_dev_init_;
// Reads all AVB keys before chroot into /system, as they might be used
// later when mounting other partitions, e.g., /vendor and /product.
std::map<std::string, std::vector<std::string>> preload_avb_key_blobs_;
@@ -233,13 +228,7 @@
// Class Definitions
// -----------------
-FirstStageMount::FirstStageMount(Fstab fstab)
- : need_dm_verity_(false), fstab_(std::move(fstab)), 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);
-
+FirstStageMount::FirstStageMount(Fstab fstab) : need_dm_verity_(false), fstab_(std::move(fstab)) {
super_partition_name_ = fs_mgr_get_super_partition_name();
}
@@ -268,12 +257,23 @@
bool FirstStageMount::InitDevices() {
std::set<std::string> devices;
- GetDmLinearMetadataDevice(&devices);
+ GetSuperDeviceName(&devices);
if (!GetDmVerityDevices(&devices)) {
return false;
}
- return InitRequiredDevices(std::move(devices));
+ if (!InitRequiredDevices(std::move(devices))) {
+ return false;
+ }
+
+ if (IsDmLinearEnabled()) {
+ auto super_symlink = "/dev/block/by-name/"s + super_partition_name_;
+ if (!android::base::Realpath(super_symlink, &super_path_)) {
+ PLOG(ERROR) << "realpath failed: " << super_symlink;
+ return false;
+ }
+ }
+ return true;
}
bool FirstStageMount::IsDmLinearEnabled() {
@@ -283,7 +283,7 @@
return false;
}
-void FirstStageMount::GetDmLinearMetadataDevice(std::set<std::string>* devices) {
+void FirstStageMount::GetSuperDeviceName(std::set<std::string>* devices) {
// Add any additional devices required for dm-linear mappings.
if (!IsDmLinearEnabled()) {
return;
@@ -296,62 +296,13 @@
// Found partitions will then be removed from it for the subsequent member
// function to check which devices are NOT created.
bool FirstStageMount::InitRequiredDevices(std::set<std::string> devices) {
- if (!InitDeviceMapper()) {
+ if (!block_dev_init_.InitDeviceMapper()) {
return false;
}
-
if (devices.empty()) {
return true;
}
-
- auto uevent_callback = [&, this](const Uevent& uevent) {
- return UeventCallback(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;
-}
-
-bool FirstStageMount::InitDeviceMapper() {
- const std::string dm_path = "/devices/virtual/misc/device-mapper";
- 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) << "device-mapper device not found in /sys, waiting for its uevent";
- Timer t;
- uevent_listener_.Poll(dm_callback, 10s);
- LOG(INFO) << "Wait for device-mapper returned after " << t;
- }
- if (!found) {
- LOG(ERROR) << "device-mapper device not found after polling timeout";
- return false;
- }
- return true;
+ return block_dev_init_.InitDevices(std::move(devices));
}
bool FirstStageMount::InitDmLinearBackingDevices(const android::fs_mgr::LpMetadata& metadata) {
@@ -375,7 +326,7 @@
if (!IsDmLinearEnabled()) {
return true;
}
- if (lp_metadata_partition_.empty()) {
+ if (super_path_.empty()) {
LOG(ERROR) << "Could not locate logical partition tables in partition "
<< super_partition_name_;
return false;
@@ -392,92 +343,19 @@
if (!InitRequiredDevices({"userdata"})) {
return false;
}
- return sm->CreateLogicalAndSnapshotPartitions(lp_metadata_partition_);
+ return sm->CreateLogicalAndSnapshotPartitions(super_path_);
}
}
- auto metadata = android::fs_mgr::ReadCurrentMetadata(lp_metadata_partition_);
+ auto metadata = android::fs_mgr::ReadCurrentMetadata(super_path_);
if (!metadata) {
- LOG(ERROR) << "Could not read logical partition metadata from " << lp_metadata_partition_;
+ LOG(ERROR) << "Could not read logical partition metadata from " << super_path_;
return false;
}
if (!InitDmLinearBackingDevices(*metadata.get())) {
return false;
}
- return android::fs_mgr::CreateLogicalPartitions(*metadata.get(), lp_metadata_partition_);
-}
-
-ListenerAction FirstStageMount::HandleBlockDevice(const std::string& name, const Uevent& uevent,
- std::set<std::string>* required_devices) {
- // Matches partition name to create device nodes.
- // Both required_devices_partition_names_ and uevent->partition_name have A/B
- // suffix when A/B is used.
- auto iter = required_devices->find(name);
- if (iter != required_devices->end()) {
- LOG(VERBOSE) << __PRETTY_FUNCTION__ << ": found partition: " << *iter;
- if (IsDmLinearEnabled() && name == super_partition_name_) {
- std::vector<std::string> links = device_handler_->GetBlockDeviceSymlinks(uevent);
- lp_metadata_partition_ = links[0];
- }
- required_devices->erase(iter);
- device_handler_->HandleUevent(uevent);
- if (required_devices->empty()) {
- return ListenerAction::kStop;
- } else {
- return ListenerAction::kContinue;
- }
- }
- return ListenerAction::kContinue;
-}
-
-ListenerAction FirstStageMount::UeventCallback(const Uevent& uevent,
- std::set<std::string>* required_devices) {
- // Ignores everything that is not a block device.
- if (uevent.subsystem != "block") {
- return ListenerAction::kContinue;
- }
-
- if (!uevent.partition_name.empty()) {
- return HandleBlockDevice(uevent.partition_name, uevent, required_devices);
- } else {
- size_t base_idx = uevent.path.rfind('/');
- if (base_idx != std::string::npos) {
- return HandleBlockDevice(uevent.path.substr(base_idx + 1), uevent, required_devices);
- }
- }
- // Not found a partition or find an unneeded partition, continue to find others.
- return ListenerAction::kContinue;
-}
-
-// Creates "/dev/block/dm-XX" for dm-verity by running coldboot on /sys/block/dm-XX.
-bool FirstStageMount::InitMappedDevice(const std::string& dm_device) {
- const std::string device_name(basename(dm_device.c_str()));
- const std::string syspath = "/sys/block/" + device_name;
- bool found = false;
-
- auto verity_callback = [&device_name, &dm_device, this, &found](const Uevent& uevent) {
- if (uevent.device_name == device_name) {
- LOG(VERBOSE) << "Creating device-mapper device : " << dm_device;
- device_handler_->HandleUevent(uevent);
- found = true;
- return ListenerAction::kStop;
- }
- return ListenerAction::kContinue;
- };
-
- uevent_listener_.RegenerateUeventsForPath(syspath, verity_callback);
- if (!found) {
- LOG(INFO) << "dm device '" << dm_device << "' not found in /sys, waiting for its uevent";
- Timer t;
- uevent_listener_.Poll(verity_callback, 10s);
- LOG(INFO) << "wait for dm device '" << dm_device << "' returned after " << t;
- }
- if (!found) {
- LOG(ERROR) << "dm device '" << dm_device << "' not found after polling timeout";
- return false;
- }
-
- return true;
+ return android::fs_mgr::CreateLogicalPartitions(*metadata.get(), super_path_);
}
bool FirstStageMount::MountPartition(const Fstab::iterator& begin, bool erase_same_mounts,
@@ -491,7 +369,7 @@
if (!fs_mgr_update_logical_partition(&(*begin))) {
return false;
}
- if (!InitMappedDevice(begin->blk_device)) {
+ if (!block_dev_init_.InitDmDevice(begin->blk_device)) {
return false;
}
}
@@ -658,7 +536,9 @@
auto init_devices = [this](std::set<std::string> devices) -> bool {
for (auto iter = devices.begin(); iter != devices.end();) {
if (android::base::StartsWith(*iter, "/dev/block/dm-")) {
- if (!InitMappedDevice(*iter)) return false;
+ if (!block_dev_init_.InitDmDevice(*iter)) {
+ return false;
+ }
iter = devices.erase(iter);
} else {
iter++;
@@ -774,7 +654,7 @@
// The exact block device name (fstab_rec->blk_device) is changed to
// "/dev/block/dm-XX". Needs to create it because ueventd isn't started in init
// first stage.
- return InitMappedDevice(fstab_entry->blk_device);
+ return block_dev_init_.InitDmDevice(fstab_entry->blk_device);
default:
return false;
}
@@ -894,7 +774,7 @@
// The exact block device name (fstab_rec->blk_device) is changed to
// "/dev/block/dm-XX". Needs to create it because ueventd isn't started in init
// first stage.
- return InitMappedDevice(fstab_entry->blk_device);
+ return block_dev_init_.InitDmDevice(fstab_entry->blk_device);
default:
return false;
}
diff --git a/init/selinux.cpp b/init/selinux.cpp
index 808cb7f..5a0255a 100644
--- a/init/selinux.cpp
+++ b/init/selinux.cpp
@@ -63,12 +63,15 @@
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
+#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <fs_avb/fs_avb.h>
+#include <fs_mgr.h>
#include <libgsi/libgsi.h>
#include <libsnapshot/snapshot.h>
#include <selinux/android.h>
+#include "block_dev_initializer.h"
#include "debug_ramdisk.h"
#include "reboot_utils.h"
#include "util.h"
@@ -598,6 +601,74 @@
return vendor_android_version;
}
+// This is for R system.img/system_ext.img to work on old vendor.img as system_ext.img
+// is introduced in R. We mount system_ext in second stage init because the first-stage
+// init in boot.img won't be updated in the system-only OTA scenario.
+void MountMissingSystemPartitions() {
+ android::fs_mgr::Fstab fstab;
+ if (!ReadDefaultFstab(&fstab)) {
+ LOG(ERROR) << "Could not read default fstab";
+ }
+
+ android::fs_mgr::Fstab mounts;
+ if (!ReadFstabFromFile("/proc/mounts", &mounts)) {
+ LOG(ERROR) << "Could not read /proc/mounts";
+ }
+
+ static const std::vector<std::string> kPartitionNames = {"system_ext", "product"};
+
+ android::fs_mgr::Fstab extra_fstab;
+ for (const auto& name : kPartitionNames) {
+ if (GetEntryForMountPoint(&mounts, "/"s + name)) {
+ // The partition is already mounted.
+ continue;
+ }
+
+ auto system_entry = GetEntryForMountPoint(&fstab, "/system");
+ if (!system_entry) {
+ LOG(ERROR) << "Could not find mount entry for /system";
+ break;
+ }
+ if (!system_entry->fs_mgr_flags.logical) {
+ LOG(INFO) << "Skipping mount of " << name << ", system is not dynamic.";
+ break;
+ }
+
+ auto entry = *system_entry;
+ auto partition_name = name + fs_mgr_get_slot_suffix();
+ auto replace_name = "system"s + fs_mgr_get_slot_suffix();
+
+ entry.mount_point = "/"s + name;
+ entry.blk_device =
+ android::base::StringReplace(entry.blk_device, replace_name, partition_name, false);
+ if (!fs_mgr_update_logical_partition(&entry)) {
+ LOG(ERROR) << "Could not update logical partition";
+ continue;
+ }
+
+ extra_fstab.emplace_back(std::move(entry));
+ }
+
+ SkipMountingPartitions(&extra_fstab);
+ if (extra_fstab.empty()) {
+ return;
+ }
+
+ BlockDevInitializer block_dev_init;
+ for (auto& entry : extra_fstab) {
+ if (access(entry.blk_device.c_str(), F_OK) != 0) {
+ auto block_dev = android::base::Basename(entry.blk_device);
+ if (!block_dev_init.InitDmDevice(block_dev)) {
+ LOG(ERROR) << "Failed to find device-mapper node: " << block_dev;
+ continue;
+ }
+ }
+ if (fs_mgr_do_mount_one(entry)) {
+ LOG(ERROR) << "Could not mount " << entry.mount_point;
+ }
+ }
+}
+
int SetupSelinux(char** argv) {
SetStdioToDevNull(argv);
InitKernelLogging(argv);
@@ -608,6 +679,8 @@
boot_clock::time_point start_time = boot_clock::now();
+ MountMissingSystemPartitions();
+
// Set up SELinux, loading the SELinux policy.
SelinuxSetupKernelLogging();
SelinuxInitialize();