remount: Do not allow remounting during checkpoints. (9aeae82f) · Commits · e / os / android_system_core

fs_mgr/Android.bp

+3 −0

Original line number	Diff line number	Diff line
		@@ -162,10 +162,13 @@ cc_binary {
		defaults: ["fs_mgr_defaults"],
		static_libs: [
		"libavb_user",
		"libutils",
		"libvold_binder",
		],
		shared_libs: [
		"libbootloader_message",
		"libbase",
		"libbinder",
		"libcutils",
		"libcrypto",
		"libext4_utils",

fs_mgr/fs_mgr_remount.cpp

+37 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,7 @@
		#include <unistd.h>

		#include <string>
		#include <thread>
		#include <utility>
		#include <vector>

		@@ -31,6 +32,8 @@
		#include <android-base/logging.h>
		#include <android-base/properties.h>
		#include <android-base/strings.h>
		#include <android/os/IVold.h>
		#include <binder/IServiceManager.h>
		#include <bootloader_message/bootloader_message.h>
		#include <cutils/android_reboot.h>
		#include <fec/io.h>
		@@ -103,8 +106,23 @@ void MyLogger(android::base::LogId id, android::base::LogSeverity severity, cons
		::exit(0); // SUCCESS
		}

		static android::sp<android::os::IVold> GetVold() {
		while (true) {
		if (auto sm = android::defaultServiceManager()) {
		if (auto binder = sm->getService(android::String16("vold"))) {
		if (auto vold = android::interface_cast<android::os::IVold>(binder)) {
		return vold;
		}
		}
		}
		std::this_thread::sleep_for(2s);
		}
		}

		} // namespace

		using namespace std::chrono_literals;

		static int do_remount(int argc, char* argv[]) {
		enum {
		SUCCESS = 0,
		@@ -118,6 +136,9 @@ static int do_remount(int argc, char* argv[]) {
		BAD_OVERLAY,
		NO_MOUNTS,
		REMOUNT_FAILED,
		MUST_REBOOT,
		BINDER_ERROR,
		CHECKPOINTING
		} retval = SUCCESS;

		// If somehow this executable is delivered on a "user" build, it can
		@@ -191,6 +212,22 @@ static int do_remount(int argc, char* argv[]) {
		return NO_FSTAB;
		}

		if (android::base::GetBoolProperty("ro.virtual_ab.enabled", false) &&
		!android::base::GetBoolProperty("ro.virtual_ab.retrofit", false)) {
		// Virtual A/B devices can use /data as backing storage; make sure we're
		// not checkpointing.
		auto vold = GetVold();
		bool checkpointing = false;
		if (!vold->isCheckpointing(&checkpointing).isOk()) {
		LOG(ERROR) << "Could not determine checkpointing status.";
		return BINDER_ERROR;
		}
		if (checkpointing) {
		LOG(ERROR) << "Cannot use remount when a checkpoint is in progress.";
		return CHECKPOINTING;
		}
		}

		// Generate the list of supported overlayfs mount points.
		auto overlayfs_candidates = fs_mgr_overlayfs_candidate_list(fstab);