Merge "TransformFstabForDsu: Support erofs GSI and refactor" am: e8e7b3bb26 (262a72cf) · Commits · e / os / android_system_core

fs_mgr/fs_mgr_fstab.cpp

+64 −43

Original line number	Diff line number	Diff line
		@@ -539,6 +539,20 @@ bool EraseFstabEntry(Fstab* fstab, const std::string& mount_point) {
		return false;
		}

		template <typename Pred>
		std::vector<FstabEntry> GetEntriesByPred(Fstab fstab, const Pred& pred) {
		if (fstab == nullptr) {
		return {};
		}
		std::vector<FstabEntry*> entries;
		for (auto&& entry : *fstab) {
		if (pred(entry)) {
		entries.push_back(&entry);
		}
		}
		return entries;
		}

		} // namespace

		bool ParseFstabFromString(const std::string& fstab_str, bool proc_mounts, Fstab* fstab_out) {
		@@ -614,11 +628,7 @@ void TransformFstabForDsu(Fstab* fstab, const std::string& dsu_slot,
		userdata = BuildDsuUserdataFstabEntry();
		}

		if (EraseFstabEntry(fstab, "/data")) {
		fstab->emplace_back(userdata);
		}

		// Convert others
		// Convert RO partitions.
		for (auto&& partition : dsu_partitions) {
		if (!EndsWith(partition, gsi::kDsuPostfix)) {
		continue;
		@@ -638,48 +648,59 @@ void TransformFstabForDsu(Fstab* fstab, const std::string& dsu_slot,
		// vendor_gsi for vendor
		std::string lp_name = partition.substr(0, partition.length() - strlen(gsi::kDsuPostfix));
		std::string mount_point = "/" + lp_name;
		std::vector<FstabEntry*> entries = GetEntriesForMountPoint(fstab, mount_point);
		if (entries.empty()) {
		FstabEntry entry = {
		.blk_device = partition,
		// .logical_partition_name is required to look up AVB Hashtree descriptors.
		.logical_partition_name = "system",
		.mount_point = mount_point,
		.fs_type = "ext4",
		.flags = MS_RDONLY,
		.fs_options = "barrier=1",
		.avb_keys = kDsuKeysDir,

		// List of fs_type entries we're lacking, need to synthesis these later.
		std::vector<std::string> lack_fs_list = {"ext4", "erofs"};

		// Only support early mount (first_stage_mount) partitions.
		auto pred = [&mount_point](const FstabEntry& entry) {
		return entry.fs_mgr_flags.first_stage_mount && entry.mount_point == mount_point;
		};
		entry.fs_mgr_flags.wait = true;
		entry.fs_mgr_flags.logical = true;
		entry.fs_mgr_flags.first_stage_mount = true;
		fstab->emplace_back(entry);
		} else {
		// If the corresponding partition exists, transform all its Fstab
		// by pointing .blk_device to the DSU partition.
		for (auto&& entry : entries) {

		// Transform all matching entries and assume they are all adjacent for simplicity.
		for (auto&& entry : GetEntriesByPred(fstab, pred)) {
		// .blk_device is replaced with the DSU partition.
		entry->blk_device = partition;
		// AVB keys for DSU should always be under kDsuKeysDir.
		// .avb_keys hints first_stage_mount to load the chained-vbmeta image from partition
		// footer. See aosp/932779 for more details.
		entry->avb_keys = kDsuKeysDir;
		// .logical_partition_name is required to look up AVB Hashtree descriptors.
		entry->logical_partition_name = lp_name;
		entry->fs_mgr_flags.logical = true;
		entry->fs_mgr_flags.slot_select = false;
		entry->fs_mgr_flags.slot_select_other = false;

		if (auto it = std::find(lack_fs_list.begin(), lack_fs_list.end(), entry->fs_type);
		it != lack_fs_list.end()) {
		lack_fs_list.erase(it);
		}
		}
		// Make sure the ext4 is included to support GSI.
		auto partition_ext4 =
		std::find_if(fstab->begin(), fstab->end(), [&](const auto& entry) {
		return entry.mount_point == mount_point && entry.fs_type == "ext4";
		});
		if (partition_ext4 == fstab->end()) {
		auto new_entry = *GetEntryForMountPoint(fstab, mount_point);
		new_entry.fs_type = "ext4";
		auto it = std::find_if(fstab->rbegin(), fstab->rend(),
		[&mount_point](const auto& entry) {
		return entry.mount_point == mount_point;
		});
		auto end_of_mount_point_group = fstab->begin() + std::distance(it, fstab->rend());
		fstab->insert(end_of_mount_point_group, new_entry);

		if (!lack_fs_list.empty()) {
		// Insert at the end of the existing mountpoint group, or at the end of fstab.
		// We assume there is at most one matching mountpoint group, which is the common case.
		auto it = std::find_if_not(std::find_if(fstab->begin(), fstab->end(), pred),
		fstab->end(), pred);
		for (const auto& fs_type : lack_fs_list) {
		it = std::next(fstab->insert(it, {.blk_device = partition,
		.logical_partition_name = lp_name,
		.mount_point = mount_point,
		.fs_type = fs_type,
		.flags = MS_RDONLY,
		.avb_keys = kDsuKeysDir,
		.fs_mgr_flags{
		.wait = true,
		.logical = true,
		.first_stage_mount = true,
		}}));
		}
		}
		}

		// Always append userdata last for stable ordering.
		if (EraseFstabEntry(fstab, "/data")) {
		fstab->emplace_back(userdata);
		}
		}

		void EnableMandatoryFlags(Fstab* fstab) {

fs_mgr/tests/fs_mgr_test.cpp

+43 −2

Original line number	Diff line number	Diff line
		@@ -1109,14 +1109,17 @@ TEST(fs_mgr, TransformFstabForDsu) {
		TemporaryFile tf;
		ASSERT_TRUE(tf.fd != -1);
		std::string fstab_contents = R"fs(
		data /data f2fs noatime wait,latemount
		system /system erofs ro wait,logical,first_stage_mount
		system /system ext4 ro wait,logical,first_stage_mount
		vendor /vendor ext4 ro wait,logical,first_stage_mount
		data /data f2fs noatime wait
		)fs";

		ASSERT_TRUE(android::base::WriteStringToFile(fstab_contents, tf.path));

		// If GSI is installed, ReadFstabFromFile() would have called TransformFstabForDsu() implicitly.
		// In other words, TransformFstabForDsu() would be called two times if running CTS-on-GSI,
		// which implies TransformFstabForDsu() should be idempotent.
		Fstab fstab;
		EXPECT_TRUE(ReadFstabFromFile(tf.path, &fstab));
		TransformFstabForDsu(&fstab, "dsu", {"system_gsi", "userdata_gsi"});
		@@ -1126,10 +1129,12 @@ data /data f2fs noatime wait

		EXPECT_EQ("/system", entry->mount_point);
		EXPECT_EQ("system_gsi", entry->blk_device);
		EXPECT_EQ("erofs", entry->fs_type);
		entry++;

		EXPECT_EQ("/system", entry->mount_point);
		EXPECT_EQ("system_gsi", entry->blk_device);
		EXPECT_EQ("ext4", entry->fs_type);
		entry++;

		EXPECT_EQ("/vendor", entry->mount_point);
		@@ -1147,7 +1152,7 @@ TEST(fs_mgr, TransformFstabForDsu_synthesisExt4Entry) {
		std::string fstab_contents = R"fs(
		system /system erofs ro wait,logical,first_stage_mount
		vendor /vendor ext4 ro wait,logical,first_stage_mount
		data /data f2fs noatime wait
		data /data f2fs noatime wait,latemount
		)fs";

		ASSERT_TRUE(android::base::WriteStringToFile(fstab_contents, tf.path));
		@@ -1177,3 +1182,39 @@ data /data f2fs noatime wait
		EXPECT_EQ("userdata_gsi", entry->blk_device);
		entry++;
		}

		TEST(fs_mgr, TransformFstabForDsu_synthesisAllMissingEntries) {
		TemporaryFile tf;
		ASSERT_TRUE(tf.fd != -1);
		std::string fstab_contents = R"fs(
		data /data f2fs noatime wait,latemount
		vendor /vendor ext4 ro wait,logical,first_stage_mount
		)fs";

		ASSERT_TRUE(android::base::WriteStringToFile(fstab_contents, tf.path));

		Fstab fstab;
		EXPECT_TRUE(ReadFstabFromFile(tf.path, &fstab));
		TransformFstabForDsu(&fstab, "dsu", {"system_gsi", "userdata_gsi"});
		ASSERT_EQ(4U, fstab.size());

		auto entry = fstab.begin();

		EXPECT_EQ("/vendor", entry->mount_point);
		EXPECT_EQ("vendor", entry->blk_device);
		entry++;

		EXPECT_EQ("/system", entry->mount_point);
		EXPECT_EQ("system_gsi", entry->blk_device);
		EXPECT_EQ("ext4", entry->fs_type);
		entry++;

		EXPECT_EQ("/system", entry->mount_point);
		EXPECT_EQ("system_gsi", entry->blk_device);
		EXPECT_EQ("erofs", entry->fs_type);
		entry++;

		EXPECT_EQ("/data", entry->mount_point);
		EXPECT_EQ("userdata_gsi", entry->blk_device);
		entry++;
		}