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5ccd3050ed
All legacy oversized chunks were created before the new chunk format, so don't try to merge into the new format.
251 lines
11 KiB
Diff
251 lines
11 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Fri, 15 Feb 2019 01:08:19 -0500
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Subject: [PATCH] Allow Saving of Oversized Chunks
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Note 1.17 update: With 1.17, Entities are no longer stored in chunk slices, so this needs updating!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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The Minecraft World Region File format has a hard cap of 1MB per chunk.
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This is due to the fact that the header of the file format only allocates
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a single byte for sector count, meaning a maximum of 256 sectors, at 4k per sector.
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This limit can be reached fairly easily with books, resulting in the chunk being unable
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to save to the world. Worse off, is that nothing printed when this occured, and silently
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performed a chunk rollback on next load.
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This leads to security risk with duplication and is being actively exploited.
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This patch catches the too large scenario, falls back and moves any large Entity
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or Tile Entity into a new compound, and this compound is saved into a different file.
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On Chunk Load, we check for oversized status, and if so, we load the extra file and
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merge the Entities and Tile Entities from the oversized chunk back into the level to
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then be loaded as normal.
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Once a chunk is returned back to normal size, the oversized flag will clear, and no
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extra data file will exist.
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This fix maintains compatability with all existing Anvil Region Format tools as it
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does not alter the save format. They will just not know about the extra entities.
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This fix also maintains compatability if someone switches server jars to one without
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this fix, as the data will remain in the oversized file. Once the server returns
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to a jar with this fix, the data will be restored.
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diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
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index 04e45b4de2f4e26853a4fed6271cf79ef8607154..44de464b5f2190944c7a7316a76e13f9c3b954ab 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
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@@ -17,8 +17,12 @@ import java.nio.file.LinkOption;
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import java.nio.file.Path;
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import java.nio.file.StandardCopyOption;
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import java.nio.file.StandardOpenOption;
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+import java.util.zip.InflaterInputStream; // Paper
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+
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import javax.annotation.Nullable;
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import net.minecraft.Util;
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+import net.minecraft.nbt.CompoundTag;
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+import net.minecraft.nbt.NbtIo;
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import net.minecraft.world.level.ChunkPos;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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@@ -45,6 +49,7 @@ public class RegionFile implements AutoCloseable {
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@VisibleForTesting
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protected final RegionBitmap usedSectors;
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public final java.util.concurrent.locks.ReentrantLock fileLock = new java.util.concurrent.locks.ReentrantLock(true); // Paper
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+ public final Path regionFile; // Paper
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public RegionFile(Path file, Path directory, boolean dsync) throws IOException {
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this(file, directory, RegionFileVersion.VERSION_DEFLATE, dsync);
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@@ -52,6 +57,8 @@ public class RegionFile implements AutoCloseable {
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public RegionFile(Path file, Path directory, RegionFileVersion outputChunkStreamVersion, boolean dsync) throws IOException {
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this.header = ByteBuffer.allocateDirect(8192);
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+ this.regionFile = file; // Paper
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+ initOversizedState(); // Paper
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this.usedSectors = new RegionBitmap();
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this.version = outputChunkStreamVersion;
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if (!Files.isDirectory(directory, new LinkOption[0])) {
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@@ -430,6 +437,74 @@ public class RegionFile implements AutoCloseable {
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}
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+ // Paper start
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+ private final byte[] oversized = new byte[1024];
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+ private int oversizedCount = 0;
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+
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+ private synchronized void initOversizedState() throws IOException {
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+ Path metaFile = getOversizedMetaFile();
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+ if (Files.exists(metaFile)) {
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+ final byte[] read = java.nio.file.Files.readAllBytes(metaFile);
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+ System.arraycopy(read, 0, oversized, 0, oversized.length);
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+ for (byte temp : oversized) {
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+ oversizedCount += temp;
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+ }
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+ }
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+ }
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+
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+ private static int getChunkIndex(int x, int z) {
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+ return (x & 31) + (z & 31) * 32;
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+ }
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+ synchronized boolean isOversized(int x, int z) {
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+ return this.oversized[getChunkIndex(x, z)] == 1;
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+ }
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+ synchronized void setOversized(int x, int z, boolean oversized) throws IOException {
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+ final int offset = getChunkIndex(x, z);
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+ boolean previous = this.oversized[offset] == 1;
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+ this.oversized[offset] = (byte) (oversized ? 1 : 0);
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+ if (!previous && oversized) {
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+ oversizedCount++;
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+ } else if (!oversized && previous) {
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+ oversizedCount--;
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+ }
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+ if (previous && !oversized) {
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+ Path oversizedFile = getOversizedFile(x, z);
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+ if (Files.exists(oversizedFile)) {
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+ Files.delete(oversizedFile);
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+ }
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+ }
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+ if (oversizedCount > 0) {
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+ if (previous != oversized) {
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+ writeOversizedMeta();
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+ }
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+ } else if (previous) {
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+ Path oversizedMetaFile = getOversizedMetaFile();
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+ if (Files.exists(oversizedMetaFile)) {
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+ Files.delete(oversizedMetaFile);
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+ }
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+ }
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+ }
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+
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+ private void writeOversizedMeta() throws IOException {
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+ java.nio.file.Files.write(getOversizedMetaFile(), oversized);
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+ }
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+
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+ private Path getOversizedMetaFile() {
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+ return this.regionFile.getParent().resolve(this.regionFile.getFileName().toString().replaceAll("\\.mca$", "") + ".oversized.nbt");
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+ }
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+
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+ private Path getOversizedFile(int x, int z) {
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+ return this.regionFile.getParent().resolve(this.regionFile.getFileName().toString().replaceAll("\\.mca$", "") + "_oversized_" + x + "_" + z + ".nbt");
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+ }
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+
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+ synchronized CompoundTag getOversizedData(int x, int z) throws IOException {
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+ Path file = getOversizedFile(x, z);
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+ try (DataInputStream out = new DataInputStream(new java.io.BufferedInputStream(new InflaterInputStream(Files.newInputStream(file))))) {
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+ return NbtIo.read((java.io.DataInput) out);
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+ }
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+
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+ }
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+ // Paper end
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private class ChunkBuffer extends ByteArrayOutputStream {
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private final ChunkPos pos;
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diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
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index 40830a2b231df9bbf676d8325e76c8252a6c1d6c..a1bfcdd713c47d8613eb4af7625a64d51161690b 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
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@@ -11,8 +11,10 @@ import java.nio.file.Files;
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import java.nio.file.Path;
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import javax.annotation.Nullable;
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import net.minecraft.nbt.CompoundTag;
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+import net.minecraft.nbt.ListTag;
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import net.minecraft.nbt.NbtIo;
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import net.minecraft.nbt.StreamTagVisitor;
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+import net.minecraft.nbt.Tag;
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import net.minecraft.util.ExceptionCollector;
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import net.minecraft.world.level.ChunkPos;
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@@ -79,6 +81,71 @@ public class RegionFileStorage implements AutoCloseable {
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}
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}
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+ // Paper start
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+ private static void printOversizedLog(String msg, Path file, int x, int z) {
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+ org.apache.logging.log4j.LogManager.getLogger().fatal(msg + " (" + file.toString().replaceAll(".+[\\\\/]", "") + " - " + x + "," + z + ") Go clean it up to remove this message. /minecraft:tp " + (x<<4)+" 128 "+(z<<4) + " - DO NOT REPORT THIS TO PAPER - You may ask for help on Discord, but do not file an issue. These error messages can not be removed.");
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+ }
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+
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+ private static final int DEFAULT_SIZE_THRESHOLD = 1024 * 8;
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+ private static final int OVERZEALOUS_TOTAL_THRESHOLD = 1024 * 64;
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+ private static final int OVERZEALOUS_THRESHOLD = 1024;
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+ private static int SIZE_THRESHOLD = DEFAULT_SIZE_THRESHOLD;
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+ private static void resetFilterThresholds() {
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+ SIZE_THRESHOLD = Math.max(1024 * 4, Integer.getInteger("Paper.FilterThreshhold", DEFAULT_SIZE_THRESHOLD));
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+ }
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+ static {
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+ resetFilterThresholds();
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+ }
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+
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+ static boolean isOverzealous() {
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+ return SIZE_THRESHOLD == OVERZEALOUS_THRESHOLD;
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+ }
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+
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+
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+ private static CompoundTag readOversizedChunk(RegionFile regionfile, ChunkPos chunkCoordinate) throws IOException {
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+ synchronized (regionfile) {
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+ try (DataInputStream datainputstream = regionfile.getChunkDataInputStream(chunkCoordinate)) {
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+ CompoundTag oversizedData = regionfile.getOversizedData(chunkCoordinate.x, chunkCoordinate.z);
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+ CompoundTag chunk = NbtIo.read((DataInput) datainputstream);
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+ if (oversizedData == null) {
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+ return chunk;
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+ }
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+ CompoundTag oversizedLevel = oversizedData.getCompound("Level");
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+
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+ mergeChunkList(chunk.getCompound("Level"), oversizedLevel, "Entities", "Entities");
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+ mergeChunkList(chunk.getCompound("Level"), oversizedLevel, "TileEntities", "TileEntities");
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+
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+ return chunk;
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+ } catch (Throwable throwable) {
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+ throwable.printStackTrace();
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+ throw throwable;
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+ }
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+ }
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+ }
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+
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+ private static void mergeChunkList(CompoundTag level, CompoundTag oversizedLevel, String key, String oversizedKey) {
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+ ListTag levelList = level.getList(key, 10);
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+ ListTag oversizedList = oversizedLevel.getList(oversizedKey, 10);
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+
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+ if (!oversizedList.isEmpty()) {
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+ levelList.addAll(oversizedList);
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+ level.put(key, levelList);
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+ }
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+ }
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+
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+ private static int getNBTSize(Tag nbtBase) {
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+ DataOutputStream test = new DataOutputStream(new org.apache.commons.io.output.NullOutputStream());
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+ try {
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+ nbtBase.write(test);
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+ return test.size();
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+ } catch (IOException e) {
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+ e.printStackTrace();
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+ return 0;
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+ }
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+ }
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+
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+ // Paper End
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+
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@Nullable
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public CompoundTag read(ChunkPos pos) throws IOException {
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// CraftBukkit start - SPIGOT-5680: There's no good reason to preemptively create files on read, save that for writing
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@@ -90,6 +157,12 @@ public class RegionFileStorage implements AutoCloseable {
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try { // Paper
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DataInputStream datainputstream = regionfile.getChunkDataInputStream(pos);
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+ // Paper start
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+ if (regionfile.isOversized(pos.x, pos.z)) {
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+ printOversizedLog("Loading Oversized Chunk!", regionfile.regionFile, pos.x, pos.z);
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+ return readOversizedChunk(regionfile, pos);
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+ }
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+ // Paper end
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CompoundTag nbttagcompound;
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label43:
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{
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@@ -172,6 +245,7 @@ public class RegionFileStorage implements AutoCloseable {
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try {
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NbtIo.write(nbt, (DataOutput) dataoutputstream);
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+ regionfile.setOversized(pos.x, pos.z, false); // Paper - We don't do this anymore, mojang stores differently, but clear old meta flag if it exists to get rid of our own meta file once last oversized is gone
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} catch (Throwable throwable) {
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if (dataoutputstream != null) {
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try {
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