Merge "fs_mgr: add readahead_size_kb in fstab" (748a7018) · Commits · e / os / android_system_core

fs_mgr/fs_mgr.cpp

+45 −0

Original line number	Diff line number	Diff line
		@@ -647,6 +647,46 @@ bool fs_mgr_is_f2fs(const std::string& blk_device) {
		return sb == cpu_to_le32(F2FS_SUPER_MAGIC);
		}

		static void SetReadAheadSize(const std::string& entry_block_device, off64_t size_kb) {
		std::string block_device;
		if (!Realpath(entry_block_device, &block_device)) {
		PERROR << "Failed to realpath " << entry_block_device;
		return;
		}

		static constexpr std::string_view kDevBlockPrefix("/dev/block/");
		if (!android::base::StartsWith(block_device, kDevBlockPrefix)) {
		LWARNING << block_device << " is not a block device";
		return;
		}

		DeviceMapper& dm = DeviceMapper::Instance();
		while (true) {
		std::string block_name = block_device;
		if (android::base::StartsWith(block_device, kDevBlockPrefix)) {
		block_name = block_device.substr(kDevBlockPrefix.length());
		}
		std::string sys_partition =
		android::base::StringPrintf("/sys/class/block/%s/partition", block_name.c_str());
		struct stat info;
		if (lstat(sys_partition.c_str(), &info) == 0) {
		// it has a partition like "sda12".
		block_name += "/..";
		}
		std::string sys_ra = android::base::StringPrintf("/sys/class/block/%s/queue/read_ahead_kb",
		block_name.c_str());
		std::string size = android::base::StringPrintf("%llu", (long long)size_kb);
		android::base::WriteStringToFile(size, sys_ra.c_str());
		LINFO << "Set readahead_kb: " << size << " on " << sys_ra;

		auto parent = dm.GetParentBlockDeviceByPath(block_device);
		if (!parent) {
		return;
		}
		block_device = *parent;
		}
		}

		//
		// Prepare the filesystem on the given block device to be mounted.
		//
		@@ -667,6 +707,11 @@ static int prepare_fs_for_mount(const std::string& blk_device, const FstabEntry&
		}
		mkdir(mount_point.c_str(), 0755);

		// Don't need to return error, since it's a salt
		if (entry.readahead_size_kb != -1) {
		SetReadAheadSize(blk_device, entry.readahead_size_kb);
		}

		int fs_stat = 0;

		if (is_extfs(entry.fs_type)) {

fs_mgr/fs_mgr_fstab.cpp

+7 −0

Original line number	Diff line number	Diff line
		@@ -255,6 +255,13 @@ void ParseFsMgrFlags(const std::string& flags, FstabEntry* entry) {
		} else {
		entry->reserved_size = static_cast<off64_t>(size);
		}
		} else if (StartsWith(flag, "readahead_size_kb=")) {
		int val;
		if (ParseInt(arg, &val, 0, 16 * 1024)) {
		entry->readahead_size_kb = val;
		} else {
		LWARNING << "Warning: readahead_size_kb= flag malformed (0 ~ 16MB): " << arg;
		}
		} else if (StartsWith(flag, "eraseblk=")) {
		// The erase block size flag is followed by an = and the flash erase block size. Get it,
		// check that it is a power of 2 and at least 4096, and return it.

fs_mgr/include_fstab/fstab/fstab.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -47,6 +47,7 @@ struct FstabEntry {
		int max_comp_streams = 0;
		off64_t zram_size = 0;
		off64_t reserved_size = 0;
		off64_t readahead_size_kb = -1;
		std::string encryption_options;
		off64_t erase_blk_size = 0;
		off64_t logical_blk_size = 0;

fs_mgr/tests/fs_mgr_test.cpp

+56 −0

Original line number	Diff line number	Diff line
		@@ -1097,3 +1097,59 @@ TEST(fs_mgr, UserdataMountedFromDefaultFstab) {
		ASSERT_NE(nullptr, fs_mgr_get_mounted_entry_for_userdata(&fstab, block_device))
		<< "/data wasn't mounted from default fstab";
		}

		TEST(fs_mgr, ReadFstabFromFile_FsMgrOptions_Readahead_Size_KB) {
		TemporaryFile tf;
		ASSERT_TRUE(tf.fd != -1);
		std::string fstab_contents = R"fs(
		source none0 swap defaults readahead_size_kb=blah
		source none1 swap defaults readahead_size_kb=128
		source none2 swap defaults readahead_size_kb=5%
		source none3 swap defaults readahead_size_kb=5kb
		source none4 swap defaults readahead_size_kb=16385
		source none5 swap defaults readahead_size_kb=-128
		source none6 swap defaults readahead_size_kb=0
		)fs";
		ASSERT_TRUE(android::base::WriteStringToFile(fstab_contents, tf.path));

		Fstab fstab;
		EXPECT_TRUE(ReadFstabFromFile(tf.path, &fstab));
		ASSERT_EQ(7U, fstab.size());

		FstabEntry::FsMgrFlags flags = {};

		auto entry = fstab.begin();
		EXPECT_EQ("none0", entry->mount_point);
		EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
		EXPECT_EQ(-1, entry->readahead_size_kb);
		entry++;

		EXPECT_EQ("none1", entry->mount_point);
		EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
		EXPECT_EQ(128, entry->readahead_size_kb);
		entry++;

		EXPECT_EQ("none2", entry->mount_point);
		EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
		EXPECT_EQ(-1, entry->readahead_size_kb);
		entry++;

		EXPECT_EQ("none3", entry->mount_point);
		EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
		EXPECT_EQ(-1, entry->readahead_size_kb);
		entry++;

		EXPECT_EQ("none4", entry->mount_point);
		EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
		EXPECT_EQ(-1, entry->readahead_size_kb);
		entry++;

		EXPECT_EQ("none5", entry->mount_point);
		EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
		EXPECT_EQ(-1, entry->readahead_size_kb);
		entry++;

		EXPECT_EQ("none6", entry->mount_point);
		EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
		EXPECT_EQ(0, entry->readahead_size_kb);
		}