Release cblocks back to the free pool (e41b029d) · Commits · e / os / android_frameworks_base

core/java/android/provider/Settings.java

+14 −0

Original line number	Diff line number	Diff line
		@@ -6623,6 +6623,20 @@ public final class Settings {
		@Readable
		public static final String COMPLETED_CATEGORY_PREFIX = "suggested.completed_category.";

		/**
		* Whether or not compress blocks should be released on install.
		* <p>The setting only determines if the platform will attempt to release
		* compress blocks; it does not guarantee that the files will have their
		* compress blocks released. Compression is currently only supported on
		* some f2fs filesystems.
		* <p>
		* Type: int (0 for false, 1 for true)
		*
		* @hide
		*/
		public static final String RELEASE_COMPRESS_BLOCKS_ON_INSTALL =
		"release_compress_blocks_on_install";

		/**
		* List of input methods that are currently enabled. This is a string
		* containing the IDs of all enabled input methods, each ID separated

core/java/com/android/internal/content/F2fsUtils.java

0 → 100644

+296 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2021 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.
		*/

		package com.android.internal.content;

		import android.annotation.NonNull;
		import android.content.ContentResolver;
		import android.os.Environment;
		import android.os.incremental.IncrementalManager;
		import android.provider.Settings.Secure;
		import android.text.TextUtils;
		import android.util.Slog;

		import java.io.File;
		import java.io.IOException;
		import java.nio.file.Files;
		import java.util.ArrayList;
		import java.util.List;

		/**
		* Utility methods to work with the f2fs file system.
		*/
		public final class F2fsUtils {
		private static final String TAG = "F2fsUtils";
		private static final boolean DEBUG_F2FS = false;

		/** Directory containing kernel features */
		private static final File sKernelFeatures =
		new File("/sys/fs/f2fs/features");
		/** File containing features enabled on "/data" */
		private static final File sUserDataFeatures =
		new File("/dev/sys/fs/by-name/userdata/features");
		private static final File sDataDirectory = Environment.getDataDirectory();
		/** Name of the compression feature */
		private static final String COMPRESSION_FEATURE = "compression";

		private static final boolean sKernelCompressionAvailable;
		private static final boolean sUserDataCompressionAvailable;

		static {
		sKernelCompressionAvailable = isCompressionEnabledInKernel();
		if (!sKernelCompressionAvailable) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "f2fs compression DISABLED; feature not part of the kernel");
		}
		}
		sUserDataCompressionAvailable = isCompressionEnabledOnUserData();
		if (!sUserDataCompressionAvailable) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "f2fs compression DISABLED; feature not enabled on filesystem");
		}
		}
		}

		/**
		* Releases compressed blocks from eligible installation artifacts.
		* <p>
		* Modern f2fs implementations starting in {@code S} support compression
		* natively within the file system. The data blocks of specific installation
		* artifacts [eg. .apk, .so, ...] can be compressed at the file system level,
		* making them look and act like any other uncompressed file, but consuming
		* a fraction of the space.
		* <p>
		* However, the unused space is not free'd automatically. Instead, we must
		* manually tell the file system to release the extra blocks [the delta between
		* the compressed and uncompressed block counts] back to the free pool.
		* <p>
		* Because of how compression works within the file system, once the blocks
		* have been released, the file becomes read-only and cannot be modified until
		* the free'd blocks have again been reserved from the free pool.
		*/
		public static void releaseCompressedBlocks(ContentResolver resolver, File file) {
		if (!sKernelCompressionAvailable \|\| !sUserDataCompressionAvailable) {
		return;
		}

		// NOTE: Retrieving this setting means we need to delay releasing cblocks
		// of any APKs installed during the PackageManagerService constructor. Instead
		// of being able to release them in the constructor, they can only be released
		// immediately prior to the system being available. When we no longer need to
		// read this setting, move cblock release back to the package manager constructor.
		final boolean releaseCompressBlocks =
		Secure.getInt(resolver, Secure.RELEASE_COMPRESS_BLOCKS_ON_INSTALL, 1) != 0;
		if (!releaseCompressBlocks) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "SKIP; release compress blocks not enabled");
		}
		return;
		}
		if (!isCompressionAllowed(file)) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "SKIP; compression not allowed");
		}
		return;
		}
		final File[] files = getFilesToRelease(file);
		if (files == null \|\| files.length == 0) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "SKIP; no files to compress");
		}
		return;
		}
		for (int i = files.length - 1; i >= 0; --i) {
		final long releasedBlocks = nativeReleaseCompressedBlocks(files[i].getAbsolutePath());
		if (DEBUG_F2FS) {
		Slog.d(TAG, "RELEASED " + releasedBlocks + " blocks"
		+ " from \"" + files[i] + "\"");
		}
		}
		}

		/**
		* Returns {@code true} if compression is allowed on the file system containing
		* the given file.
		* <p>
		* NOTE: The return value does not mean if the given file, or any other file
		* on the same file system, is actually compressed. It merely determines whether
		* not files <em>may</em> be compressed.
		*/
		private static boolean isCompressionAllowed(@NonNull File file) {
		final String filePath;
		try {
		filePath = file.getCanonicalPath();
		} catch (IOException e) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "f2fs compression DISABLED; could not determine path");
		}
		return false;
		}
		if (IncrementalManager.isIncrementalPath(filePath)) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "f2fs compression DISABLED; file on incremental fs");
		}
		return false;
		}
		if (!isChild(sDataDirectory, filePath)) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "f2fs compression DISABLED; file not on /data");
		}
		return false;
		}
		if (DEBUG_F2FS) {
		Slog.d(TAG, "f2fs compression ENABLED");
		}
		return true;
		}

		/**
		* Returns {@code true} if the given child is a descendant of the base.
		*/
		private static boolean isChild(@NonNull File base, @NonNull String childPath) {
		try {
		base = base.getCanonicalFile();

		File parentFile = new File(childPath).getCanonicalFile();
		while (parentFile != null) {
		if (base.equals(parentFile)) {
		return true;
		}
		parentFile = parentFile.getParentFile();
		}
		return false;
		} catch (IOException ignore) {
		return false;
		}
		}

		/**
		* Returns whether or not the compression feature is enabled in the kernel.
		* <p>
		* NOTE: This doesn't mean compression is enabled on a particular file system
		* or any files have been compressed. Only that the functionality is enabled
		* on the device.
		*/
		private static boolean isCompressionEnabledInKernel() {
		final File[] features = sKernelFeatures.listFiles();
		if (features == null \|\| features.length == 0) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "ERROR; no kernel features");
		}
		return false;
		}
		for (int i = features.length - 1; i >= 0; --i) {
		final File feature = features[i];
		if (COMPRESSION_FEATURE.equals(features[i].getName())) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "FOUND kernel compression feature");
		}
		return true;
		}
		}
		if (DEBUG_F2FS) {
		Slog.d(TAG, "ERROR; kernel compression feature not found");
		}
		return false;
		}

		/**
		* Returns whether or not the compression feature is enabled on user data [ie. "/data"].
		* <p>
		* NOTE: This doesn't mean any files have been compressed. Only that the functionality
		* is enabled on the file system.
		*/
		private static boolean isCompressionEnabledOnUserData() {
		if (!sUserDataFeatures.exists()
		\|\| !sUserDataFeatures.isFile()
		\|\| !sUserDataFeatures.canRead()) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "ERROR; filesystem features not available");
		}
		return false;
		}
		final List<String> configLines;
		try {
		configLines = Files.readAllLines(sUserDataFeatures.toPath());
		} catch (IOException ignore) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "ERROR; couldn't read filesystem features");
		}
		return false;
		}
		if (configLines == null
		\|\| configLines.size() > 1
		\|\| TextUtils.isEmpty(configLines.get(0))) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "ERROR; no filesystem features");
		}
		return false;
		}
		final String[] features = configLines.get(0).split(",");
		for (int i = features.length - 1; i >= 0; --i) {
		if (COMPRESSION_FEATURE.equals(features[i].trim())) {
		if (DEBUG_F2FS) {
		Slog.d(TAG, "FOUND filesystem compression feature");
		}
		return true;
		}
		}
		if (DEBUG_F2FS) {
		Slog.d(TAG, "ERROR; filesystem compression feature not found");
		}
		return false;
		}

		/**
		* Returns all files contained within the directory at any depth from the given path.
		*/
		private static List<File> getFilesRecursive(@NonNull File path) {
		final File[] allFiles = path.listFiles();
		if (allFiles == null) {
		return null;
		}
		final ArrayList<File> files = new ArrayList<>();
		for (File f : allFiles) {
		if (f.isDirectory()) {
		files.addAll(getFilesRecursive(f));
		} else if (f.isFile()) {
		files.add(f);
		}
		}
		return files;
		}

		/**
		* Returns all files contained within the directory at any depth from the given path.
		*/
		private static File[] getFilesToRelease(@NonNull File codePath) {
		final List<File> files = getFilesRecursive(codePath);
		if (files == null) {
		if (codePath.isFile()) {
		return new File[] { codePath };
		}
		return null;
		}
		if (files.size() == 0) {
		return null;
		}
		return files.toArray(new File[files.size()]);
		}

		private static native long nativeReleaseCompressedBlocks(String path);

		}

core/java/com/android/internal/content/OWNERS

0 → 100644

+5 −0

Original line number	Diff line number	Diff line
		# Bug component: 36137
		include /core/java/android/content/pm/OWNERS

		per-file ReferrerIntent.aidl = file:/services/core/java/com/android/server/am/OWNERS
		per-file ReferrerIntent.java = file:/services/core/java/com/android/server/am/OWNERS

core/jni/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -84,6 +84,7 @@ cc_library_shared {
		android: {
		srcs: [
		"AndroidRuntime.cpp",
		"com_android_internal_content_F2fsUtils.cpp",
		"com_android_internal_content_NativeLibraryHelper.cpp",
		"com_google_android_gles_jni_EGLImpl.cpp",
		"com_google_android_gles_jni_GLImpl.cpp", // TODO: .arm

core/jni/AndroidRuntime.cpp

+2 −0

Original line number	Diff line number	Diff line
		@@ -190,6 +190,7 @@ extern int register_android_content_res_ObbScanner(JNIEnv* env);
		extern int register_android_content_res_Configuration(JNIEnv* env);
		extern int register_android_animation_PropertyValuesHolder(JNIEnv *env);
		extern int register_android_security_Scrypt(JNIEnv *env);
		extern int register_com_android_internal_content_F2fsUtils(JNIEnv* env);
		extern int register_com_android_internal_content_NativeLibraryHelper(JNIEnv *env);
		extern int register_com_android_internal_content_om_OverlayConfig(JNIEnv *env);
		extern int register_com_android_internal_net_NetworkUtilsInternal(JNIEnv* env);
		@@ -1621,6 +1622,7 @@ static const RegJNIRec gRegJNI[] = {

		REG_JNI(register_android_animation_PropertyValuesHolder),
		REG_JNI(register_android_security_Scrypt),
		REG_JNI(register_com_android_internal_content_F2fsUtils),
		REG_JNI(register_com_android_internal_content_NativeLibraryHelper),
		REG_JNI(register_com_android_internal_os_DmabufInfoReader),
		REG_JNI(register_com_android_internal_os_FuseAppLoop),