diff options
Diffstat (limited to 'paper-server/patches/features/0024-Attempt-to-recalculate-regionfile-header-if-it-is-co.patch')
| -rw-r--r-- | paper-server/patches/features/0024-Attempt-to-recalculate-regionfile-header-if-it-is-co.patch | 732 |
1 files changed, 732 insertions, 0 deletions
diff --git a/paper-server/patches/features/0024-Attempt-to-recalculate-regionfile-header-if-it-is-co.patch b/paper-server/patches/features/0024-Attempt-to-recalculate-regionfile-header-if-it-is-co.patch new file mode 100644 index 0000000000..e35d6a31a9 --- /dev/null +++ b/paper-server/patches/features/0024-Attempt-to-recalculate-regionfile-header-if-it-is-co.patch @@ -0,0 +1,732 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Spottedleaf <[email protected]> +Date: Sun, 2 Feb 2020 02:25:10 -0800 +Subject: [PATCH] Attempt to recalculate regionfile header if it is corrupt + +Instead of trying to relocate the chunk, which is seems to never +be the correct choice, so we end up duplicating or swapping chunks, +we instead drop the current regionfile header and recalculate - +hoping that at least then we don't swap chunks, and maybe recover +them all. + +diff --git a/net/minecraft/world/level/chunk/storage/RegionBitmap.java b/net/minecraft/world/level/chunk/storage/RegionBitmap.java +index 64a718c98f799c62a5bb28e1e8e5f66cc96c915d..666f2e967c99f78422c83fb20e1a3bf3efa7845e 100644 +--- a/net/minecraft/world/level/chunk/storage/RegionBitmap.java ++++ b/net/minecraft/world/level/chunk/storage/RegionBitmap.java +@@ -9,6 +9,27 @@ import java.util.BitSet; + public class RegionBitmap { + private final BitSet used = new BitSet(); + ++ // Paper start - Attempt to recalculate regionfile header if it is corrupt ++ public final void copyFrom(RegionBitmap other) { ++ BitSet thisBitset = this.used; ++ BitSet otherBitset = other.used; ++ ++ for (int i = 0; i < Math.max(thisBitset.size(), otherBitset.size()); ++i) { ++ thisBitset.set(i, otherBitset.get(i)); ++ } ++ } ++ ++ public final boolean tryAllocate(int from, int length) { ++ BitSet bitset = this.used; ++ int firstSet = bitset.nextSetBit(from); ++ if (firstSet > 0 && firstSet < (from + length)) { ++ return false; ++ } ++ bitset.set(from, from + length); ++ return true; ++ } ++ // Paper end - Attempt to recalculate regionfile header if it is corrupt ++ + public void force(int sectorOffset, int sectorCount) { + this.used.set(sectorOffset, sectorOffset + sectorCount); + } +diff --git a/net/minecraft/world/level/chunk/storage/RegionFile.java b/net/minecraft/world/level/chunk/storage/RegionFile.java +index ff4fc280409f680f3879a495e37cf1925b1a38f1..a4621c96fd456c5cdd1b6847931806e677b26b30 100644 +--- a/net/minecraft/world/level/chunk/storage/RegionFile.java ++++ b/net/minecraft/world/level/chunk/storage/RegionFile.java +@@ -46,6 +46,355 @@ public class RegionFile implements AutoCloseable, ca.spottedleaf.moonrise.patche + @VisibleForTesting + protected final RegionBitmap usedSectors = new RegionBitmap(); + ++ // Paper start - Attempt to recalculate regionfile header if it is corrupt ++ private static long roundToSectors(long bytes) { ++ long sectors = bytes >>> 12; // 4096 = 2^12 ++ long remainingBytes = bytes & 4095; ++ long sign = -remainingBytes; // sign is 1 if nonzero ++ return sectors + (sign >>> 63); ++ } ++ ++ private static final net.minecraft.nbt.CompoundTag OVERSIZED_COMPOUND = new net.minecraft.nbt.CompoundTag(); ++ ++ private @Nullable net.minecraft.nbt.CompoundTag attemptRead(long sector, int chunkDataLength, long fileLength) throws IOException { ++ try { ++ if (chunkDataLength < 0) { ++ return null; ++ } ++ ++ long offset = sector * 4096L + 4L; // offset for chunk data ++ ++ if ((offset + chunkDataLength) > fileLength) { ++ return null; ++ } ++ ++ ByteBuffer chunkData = ByteBuffer.allocate(chunkDataLength); ++ if (chunkDataLength != this.file.read(chunkData, offset)) { ++ return null; ++ } ++ ++ ((java.nio.Buffer)chunkData).flip(); ++ ++ byte compressionType = chunkData.get(); ++ if (compressionType < 0) { // compressionType & 128 != 0 ++ // oversized chunk ++ return OVERSIZED_COMPOUND; ++ } ++ ++ RegionFileVersion compression = RegionFileVersion.fromId(compressionType); ++ if (compression == null) { ++ return null; ++ } ++ ++ InputStream input = compression.wrap(new ByteArrayInputStream(chunkData.array(), chunkData.position(), chunkDataLength - chunkData.position())); ++ ++ return net.minecraft.nbt.NbtIo.read(new DataInputStream(input)); ++ } catch (Exception ex) { ++ return null; ++ } ++ } ++ ++ private int getLength(long sector) throws IOException { ++ ByteBuffer length = ByteBuffer.allocate(4); ++ if (4 != this.file.read(length, sector * 4096L)) { ++ return -1; ++ } ++ ++ return length.getInt(0); ++ } ++ ++ private void backupRegionFile() { ++ Path backup = this.path.getParent().resolve(this.path.getFileName() + "." + new java.util.Random().nextLong() + ".backup"); ++ this.backupRegionFile(backup); ++ } ++ ++ private void backupRegionFile(Path to) { ++ try { ++ this.file.force(true); ++ LOGGER.warn("Backing up regionfile \"" + this.path.toAbsolutePath() + "\" to " + to.toAbsolutePath()); ++ java.nio.file.Files.copy(this.path, to, java.nio.file.StandardCopyOption.COPY_ATTRIBUTES); ++ LOGGER.warn("Backed up the regionfile to " + to.toAbsolutePath()); ++ } catch (IOException ex) { ++ LOGGER.error("Failed to backup to " + to.toAbsolutePath(), ex); ++ } ++ } ++ ++ private static boolean inSameRegionfile(ChunkPos first, ChunkPos second) { ++ return (first.x & ~31) == (second.x & ~31) && (first.z & ~31) == (second.z & ~31); ++ } ++ ++ // note: only call for CHUNK regionfiles ++ boolean recalculateHeader() throws IOException { ++ if (!this.canRecalcHeader) { ++ return false; ++ } ++ ChunkPos ourLowerLeftPosition = RegionFileStorage.getRegionFileCoordinates(this.path); ++ if (ourLowerLeftPosition == null) { ++ LOGGER.error("Unable to get chunk location of regionfile " + this.path.toAbsolutePath() + ", cannot recover header"); ++ return false; ++ } ++ synchronized (this) { ++ LOGGER.warn("Corrupt regionfile header detected! Attempting to re-calculate header offsets for regionfile " + this.path.toAbsolutePath(), new Throwable()); ++ ++ // try to backup file so maybe it could be sent to us for further investigation ++ ++ this.backupRegionFile(); ++ net.minecraft.nbt.CompoundTag[] compounds = new net.minecraft.nbt.CompoundTag[32 * 32]; // only in the regionfile (i.e exclude mojang/aikar oversized data) ++ int[] rawLengths = new int[32 * 32]; // length of chunk data including 4 byte length field, bytes ++ int[] sectorOffsets = new int[32 * 32]; // in sectors ++ boolean[] hasAikarOversized = new boolean[32 * 32]; ++ ++ long fileLength = this.file.size(); ++ long totalSectors = roundToSectors(fileLength); ++ ++ // search the regionfile from start to finish for the most up-to-date chunk data ++ ++ for (long i = 2, maxSector = Math.min((long)(Integer.MAX_VALUE >>> 8), totalSectors); i < maxSector; ++i) { // first two sectors are header, skip ++ int chunkDataLength = this.getLength(i); ++ net.minecraft.nbt.CompoundTag compound = this.attemptRead(i, chunkDataLength, fileLength); ++ if (compound == null || compound == OVERSIZED_COMPOUND) { ++ continue; ++ } ++ ++ ChunkPos chunkPos = SerializableChunkData.getChunkCoordinate(compound); ++ if (!inSameRegionfile(ourLowerLeftPosition, chunkPos)) { ++ LOGGER.error("Ignoring absolute chunk " + chunkPos + " in regionfile as it is not contained in the bounds of the regionfile '" + this.path.toAbsolutePath() + "'. It should be in regionfile (" + (chunkPos.x >> 5) + "," + (chunkPos.z >> 5) + ")"); ++ continue; ++ } ++ int location = (chunkPos.x & 31) | ((chunkPos.z & 31) << 5); ++ ++ net.minecraft.nbt.CompoundTag otherCompound = compounds[location]; ++ ++ if (otherCompound != null && SerializableChunkData.getLastWorldSaveTime(otherCompound) > SerializableChunkData.getLastWorldSaveTime(compound)) { ++ continue; // don't overwrite newer data. ++ } ++ ++ // aikar oversized? ++ Path aikarOversizedFile = this.getOversizedFile(chunkPos.x, chunkPos.z); ++ boolean isAikarOversized = false; ++ if (Files.exists(aikarOversizedFile)) { ++ try { ++ net.minecraft.nbt.CompoundTag aikarOversizedCompound = this.getOversizedData(chunkPos.x, chunkPos.z); ++ if (SerializableChunkData.getLastWorldSaveTime(compound) == SerializableChunkData.getLastWorldSaveTime(aikarOversizedCompound)) { ++ // best we got for an id. hope it's good enough ++ isAikarOversized = true; ++ } ++ } catch (Exception ex) { ++ LOGGER.error("Failed to read aikar oversized data for absolute chunk (" + chunkPos.x + "," + chunkPos.z + ") in regionfile " + this.path.toAbsolutePath() + ", oversized data for this chunk will be lost", ex); ++ // fall through, if we can't read aikar oversized we can't risk corrupting chunk data ++ } ++ } ++ ++ hasAikarOversized[location] = isAikarOversized; ++ compounds[location] = compound; ++ rawLengths[location] = chunkDataLength + 4; ++ sectorOffsets[location] = (int)i; ++ ++ int chunkSectorLength = (int)roundToSectors(rawLengths[location]); ++ i += chunkSectorLength; ++ --i; // gets incremented next iteration ++ } ++ ++ // forge style oversized data is already handled by the local search, and aikar data we just hope ++ // we get it right as aikar data has no identifiers we could use to try and find its corresponding ++ // local data compound ++ ++ java.nio.file.Path containingFolder = this.externalFileDir; ++ Path[] regionFiles = Files.list(containingFolder).toArray(Path[]::new); ++ boolean[] oversized = new boolean[32 * 32]; ++ RegionFileVersion[] oversizedCompressionTypes = new RegionFileVersion[32 * 32]; ++ ++ if (regionFiles != null) { ++ int lowerXBound = ourLowerLeftPosition.x; // inclusive ++ int lowerZBound = ourLowerLeftPosition.z; // inclusive ++ int upperXBound = lowerXBound + 32 - 1; // inclusive ++ int upperZBound = lowerZBound + 32 - 1; // inclusive ++ ++ // read mojang oversized data ++ for (Path regionFile : regionFiles) { ++ ChunkPos oversizedCoords = getOversizedChunkPair(regionFile); ++ if (oversizedCoords == null) { ++ continue; ++ } ++ ++ if ((oversizedCoords.x < lowerXBound || oversizedCoords.x > upperXBound) || (oversizedCoords.z < lowerZBound || oversizedCoords.z > upperZBound)) { ++ continue; // not in our regionfile ++ } ++ ++ // ensure oversized data is valid & is newer than data in the regionfile ++ ++ int location = (oversizedCoords.x & 31) | ((oversizedCoords.z & 31) << 5); ++ ++ byte[] chunkData; ++ try { ++ chunkData = Files.readAllBytes(regionFile); ++ } catch (Exception ex) { ++ LOGGER.error("Failed to read oversized chunk data in file " + regionFile.toAbsolutePath() + ", data will be lost", ex); ++ continue; ++ } ++ ++ net.minecraft.nbt.CompoundTag compound = null; ++ ++ // We do not know the compression type, as it's stored in the regionfile. So we need to try all of them ++ RegionFileVersion compression = null; ++ for (RegionFileVersion compressionType : RegionFileVersion.VERSIONS.values()) { ++ try { ++ DataInputStream in = new DataInputStream(compressionType.wrap(new ByteArrayInputStream(chunkData))); // typical java ++ compound = net.minecraft.nbt.NbtIo.read((java.io.DataInput)in); ++ compression = compressionType; ++ break; // reaches here iff readNBT does not throw ++ } catch (Exception ex) { ++ continue; ++ } ++ } ++ ++ if (compound == null) { ++ LOGGER.error("Failed to read oversized chunk data in file " + regionFile.toAbsolutePath() + ", it's corrupt. Its data will be lost"); ++ continue; ++ } ++ ++ if (!SerializableChunkData.getChunkCoordinate(compound).equals(oversizedCoords)) { ++ LOGGER.error("Can't use oversized chunk stored in " + regionFile.toAbsolutePath() + ", got absolute chunkpos: " + SerializableChunkData.getChunkCoordinate(compound) + ", expected " + oversizedCoords); ++ continue; ++ } ++ ++ if (compounds[location] == null || SerializableChunkData.getLastWorldSaveTime(compound) > SerializableChunkData.getLastWorldSaveTime(compounds[location])) { ++ oversized[location] = true; ++ oversizedCompressionTypes[location] = compression; ++ } ++ } ++ } ++ ++ // now we need to calculate a new offset header ++ ++ int[] calculatedOffsets = new int[32 * 32]; ++ RegionBitmap newSectorAllocations = new RegionBitmap(); ++ newSectorAllocations.force(0, 2); // make space for header ++ ++ // allocate sectors for normal chunks ++ ++ for (int chunkX = 0; chunkX < 32; ++chunkX) { ++ for (int chunkZ = 0; chunkZ < 32; ++chunkZ) { ++ int location = chunkX | (chunkZ << 5); ++ ++ if (oversized[location]) { ++ continue; ++ } ++ ++ int rawLength = rawLengths[location]; // bytes ++ int sectorOffset = sectorOffsets[location]; // sectors ++ int sectorLength = (int)roundToSectors(rawLength); ++ ++ if (newSectorAllocations.tryAllocate(sectorOffset, sectorLength)) { ++ calculatedOffsets[location] = sectorOffset << 8 | (sectorLength > 255 ? 255 : sectorLength); // support forge style oversized ++ } else { ++ LOGGER.error("Failed to allocate space for local chunk (overlapping data??) at (" + chunkX + "," + chunkZ + ") in regionfile " + this.path.toAbsolutePath() + ", chunk will be regenerated"); ++ } ++ } ++ } ++ ++ // allocate sectors for oversized chunks ++ ++ for (int chunkX = 0; chunkX < 32; ++chunkX) { ++ for (int chunkZ = 0; chunkZ < 32; ++chunkZ) { ++ int location = chunkX | (chunkZ << 5); ++ ++ if (!oversized[location]) { ++ continue; ++ } ++ ++ int sectorOffset = newSectorAllocations.allocate(1); ++ int sectorLength = 1; ++ ++ try { ++ this.file.write(this.createExternalStub(oversizedCompressionTypes[location]), sectorOffset * 4096); ++ // only allocate in the new offsets if the write succeeds ++ calculatedOffsets[location] = sectorOffset << 8 | (sectorLength > 255 ? 255 : sectorLength); // support forge style oversized ++ } catch (IOException ex) { ++ newSectorAllocations.free(sectorOffset, sectorLength); ++ LOGGER.error("Failed to write new oversized chunk data holder, local chunk at (" + chunkX + "," + chunkZ + ") in regionfile " + this.path.toAbsolutePath() + " will be regenerated"); ++ } ++ } ++ } ++ ++ // rewrite aikar oversized data ++ ++ this.oversizedCount = 0; ++ for (int chunkX = 0; chunkX < 32; ++chunkX) { ++ for (int chunkZ = 0; chunkZ < 32; ++chunkZ) { ++ int location = chunkX | (chunkZ << 5); ++ int isAikarOversized = hasAikarOversized[location] ? 1 : 0; ++ ++ this.oversizedCount += isAikarOversized; ++ this.oversized[location] = (byte)isAikarOversized; ++ } ++ } ++ ++ if (this.oversizedCount > 0) { ++ try { ++ this.writeOversizedMeta(); ++ } catch (Exception ex) { ++ LOGGER.error("Failed to write aikar oversized chunk meta, all aikar style oversized chunk data will be lost for regionfile " + this.path.toAbsolutePath(), ex); ++ Files.deleteIfExists(this.getOversizedMetaFile()); ++ } ++ } else { ++ Files.deleteIfExists(this.getOversizedMetaFile()); ++ } ++ ++ this.usedSectors.copyFrom(newSectorAllocations); ++ ++ // before we overwrite the old sectors, print a summary of the chunks that got changed. ++ ++ LOGGER.info("Starting summary of changes for regionfile " + this.path.toAbsolutePath()); ++ ++ for (int chunkX = 0; chunkX < 32; ++chunkX) { ++ for (int chunkZ = 0; chunkZ < 32; ++chunkZ) { ++ int location = chunkX | (chunkZ << 5); ++ ++ int oldOffset = this.offsets.get(location); ++ int newOffset = calculatedOffsets[location]; ++ ++ if (oldOffset == newOffset) { ++ continue; ++ } ++ ++ this.offsets.put(location, newOffset); // overwrite incorrect offset ++ ++ if (oldOffset == 0) { ++ // found lost data ++ LOGGER.info("Found missing data for local chunk (" + chunkX + "," + chunkZ + ") in regionfile " + this.path.toAbsolutePath()); ++ } else if (newOffset == 0) { ++ LOGGER.warn("Data for local chunk (" + chunkX + "," + chunkZ + ") could not be recovered in regionfile " + this.path.toAbsolutePath() + ", it will be regenerated"); ++ } else { ++ LOGGER.info("Local chunk (" + chunkX + "," + chunkZ + ") changed to point to newer data or correct chunk in regionfile " + this.path.toAbsolutePath()); ++ } ++ } ++ } ++ ++ LOGGER.info("End of change summary for regionfile " + this.path.toAbsolutePath()); ++ ++ // simply destroy the timestamp header, it's not used ++ ++ for (int i = 0; i < 32 * 32; ++i) { ++ this.timestamps.put(i, calculatedOffsets[i] != 0 ? RegionFile.getTimestamp() : 0); // write a valid timestamp for valid chunks, I do not want to find out whatever dumb program actually checks this ++ } ++ ++ // write new header ++ try { ++ this.flush(); ++ this.file.force(true); // try to ensure it goes through... ++ LOGGER.info("Successfully wrote new header to disk for regionfile " + this.path.toAbsolutePath()); ++ } catch (IOException ex) { ++ LOGGER.error("Failed to write new header to disk for regionfile " + this.path.toAbsolutePath(), ex); ++ } ++ } ++ ++ return true; ++ } ++ ++ final boolean canRecalcHeader; // final forces compile fail on new constructor ++ // Paper end - Attempt to recalculate regionfile header if it is corrupt ++ + // Paper start - rewrite chunk system + @Override + public final ca.spottedleaf.moonrise.patches.chunk_system.io.MoonriseRegionFileIO.RegionDataController.WriteData moonrise$startWrite(final net.minecraft.nbt.CompoundTag data, final ChunkPos pos) throws IOException { +@@ -74,6 +423,7 @@ public class RegionFile implements AutoCloseable, ca.spottedleaf.moonrise.patche + throw new IllegalArgumentException("Expected directory, got " + externalFileDir.toAbsolutePath()); + } else { + this.externalFileDir = externalFileDir; ++ this.canRecalcHeader = RegionFileStorage.isChunkDataFolder(this.externalFileDir); // Paper - add can recalc flag + this.offsets = this.header.asIntBuffer(); + this.offsets.limit(1024); + this.header.position(4096); +@@ -94,11 +444,13 @@ public class RegionFile implements AutoCloseable, ca.spottedleaf.moonrise.patche + + long size = Files.size(path); + +- for (int i1 = 0; i1 < 1024; i1++) { ++ boolean needsHeaderRecalc = false; // Paper - recalculate header on header corruption ++ boolean hasBackedUp = false; // Paper - recalculate header on header corruption ++ for (int i1 = 0; i1 < 1024; i1++) { final int headerLocation = i1; // Paper - we expect this to be the header location + int i2 = this.offsets.get(i1); + if (i2 != 0) { +- int sectorNumber = getSectorNumber(i2); +- int numSectors = getNumSectors(i2); ++ final int sectorNumber = getSectorNumber(i2); // Paper - we expect this to be offset in file in sectors ++ int numSectors = getNumSectors(i2); // Paper - diff on change, we expect this to be sector length of region - watch out for reassignments + // Spigot start + if (numSectors == 255) { + // We're maxed out, so we need to read the proper length from the section +@@ -109,18 +461,62 @@ public class RegionFile implements AutoCloseable, ca.spottedleaf.moonrise.patche + // Spigot end + if (sectorNumber < 2) { + LOGGER.warn("Region file {} has invalid sector at index: {}; sector {} overlaps with header", path, i1, sectorNumber); +- this.offsets.put(i1, 0); ++ //this.offsets.put(i1, 0); // Paper - we catch this, but need it in the header for the summary change + } else if (numSectors == 0) { + LOGGER.warn("Region file {} has an invalid sector at index: {}; size has to be > 0", path, i1); +- this.offsets.put(i1, 0); ++ //this.offsets.put(i1, 0); // Paper - we catch this, but need it in the header for the summary change + } else if (sectorNumber * 4096L > size) { + LOGGER.warn("Region file {} has an invalid sector at index: {}; sector {} is out of bounds", path, i1, sectorNumber); +- this.offsets.put(i1, 0); ++ //this.offsets.put(i1, 0); // Paper - we catch this, but need it in the header for the summary change + } else { +- this.usedSectors.force(sectorNumber, numSectors); ++ //this.usedSectors.force(sectorNumber, numSectors); // Paper - move this down so we can check if it fails to allocate ++ } ++ // Paper start - recalculate header on header corruption ++ if (sectorNumber < 2 || numSectors <= 0 || ((long)sectorNumber * 4096L) > size) { ++ if (canRecalcHeader) { ++ LOGGER.error("Detected invalid header for regionfile " + this.path.toAbsolutePath() + "! Recalculating header..."); ++ needsHeaderRecalc = true; ++ break; ++ } else { ++ // location = chunkX | (chunkZ << 5); ++ LOGGER.error("Detected invalid header for regionfile " + this.path.toAbsolutePath() + ++ "! Cannot recalculate, removing local chunk (" + (headerLocation & 31) + "," + (headerLocation >>> 5) + ") from header"); ++ if (!hasBackedUp) { ++ hasBackedUp = true; ++ this.backupRegionFile(); ++ } ++ this.timestamps.put(headerLocation, 0); // be consistent, delete the timestamp too ++ this.offsets.put(headerLocation, 0); // delete the entry from header ++ continue; ++ } ++ } ++ boolean failedToAllocate = !this.usedSectors.tryAllocate(sectorNumber, numSectors); ++ if (failedToAllocate) { ++ LOGGER.error("Overlapping allocation by local chunk (" + (headerLocation & 31) + "," + (headerLocation >>> 5) + ") in regionfile " + this.path.toAbsolutePath()); + } ++ if (failedToAllocate & !canRecalcHeader) { ++ // location = chunkX | (chunkZ << 5); ++ LOGGER.error("Detected invalid header for regionfile " + this.path.toAbsolutePath() + ++ "! Cannot recalculate, removing local chunk (" + (headerLocation & 31) + "," + (headerLocation >>> 5) + ") from header"); ++ if (!hasBackedUp) { ++ hasBackedUp = true; ++ this.backupRegionFile(); ++ } ++ this.timestamps.put(headerLocation, 0); // be consistent, delete the timestamp too ++ this.offsets.put(headerLocation, 0); // delete the entry from header ++ continue; ++ } ++ needsHeaderRecalc |= failedToAllocate; ++ // Paper end - recalculate header on header corruption + } + } ++ // Paper start - recalculate header on header corruption ++ // we move the recalc here so comparison to old header is correct when logging to console ++ if (needsHeaderRecalc) { // true if header gave us overlapping allocations or had other issues ++ LOGGER.error("Recalculating regionfile " + this.path.toAbsolutePath() + ", header gave erroneous offsets & locations"); ++ this.recalculateHeader(); ++ } ++ // Paper end + } + } + } +@@ -130,10 +526,35 @@ public class RegionFile implements AutoCloseable, ca.spottedleaf.moonrise.patche + } + + private Path getExternalChunkPath(ChunkPos chunkPos) { +- String string = "c." + chunkPos.x + "." + chunkPos.z + ".mcc"; ++ String string = "c." + chunkPos.x + "." + chunkPos.z + ".mcc"; // Paper - diff on change + return this.externalFileDir.resolve(string); + } + ++ // Paper start ++ private static @Nullable ChunkPos getOversizedChunkPair(Path file) { ++ String fileName = file.getFileName().toString(); ++ ++ if (!fileName.startsWith("c.") || !fileName.endsWith(".mcc")) { ++ return null; ++ } ++ ++ String[] split = fileName.split("\\."); ++ ++ if (split.length != 4) { ++ return null; ++ } ++ ++ try { ++ int x = Integer.parseInt(split[1]); ++ int z = Integer.parseInt(split[2]); ++ ++ return new ChunkPos(x, z); ++ } catch (NumberFormatException ex) { ++ return null; ++ } ++ } ++ // Paper end ++ + @Nullable + public synchronized DataInputStream getChunkDataInputStream(ChunkPos chunkPos) throws IOException { + int offset = this.getOffset(chunkPos); +@@ -155,30 +576,67 @@ public class RegionFile implements AutoCloseable, ca.spottedleaf.moonrise.patche + byteBuffer.flip(); + if (byteBuffer.remaining() < 5) { + LOGGER.error("Chunk {} header is truncated: expected {} but read {}", chunkPos, i, byteBuffer.remaining()); ++ // Paper start - recalculate header on regionfile corruption ++ if (this.canRecalcHeader && this.recalculateHeader()) { ++ return this.getChunkDataInputStream(chunkPos); ++ } ++ // Paper end - recalculate header on regionfile corruption + return null; + } else { + int _int = byteBuffer.getInt(); + byte b = byteBuffer.get(); + if (_int == 0) { + LOGGER.warn("Chunk {} is allocated, but stream is missing", chunkPos); ++ // Paper start - recalculate header on regionfile corruption ++ if (this.canRecalcHeader && this.recalculateHeader()) { ++ return this.getChunkDataInputStream(chunkPos); ++ } ++ // Paper end - recalculate header on regionfile corruption + return null; + } else { + int i1 = _int - 1; + if (isExternalStreamChunk(b)) { + if (i1 != 0) { + LOGGER.warn("Chunk has both internal and external streams"); ++ // Paper start - recalculate header on regionfile corruption ++ if (this.canRecalcHeader && this.recalculateHeader()) { ++ return this.getChunkDataInputStream(chunkPos); ++ } ++ // Paper end - recalculate header on regionfile corruption + } + +- return this.createExternalChunkInputStream(chunkPos, getExternalChunkVersion(b)); ++ // Paper start - recalculate header on regionfile corruption ++ final DataInputStream ret = this.createExternalChunkInputStream(chunkPos, getExternalChunkVersion(b)); ++ if (ret == null && this.canRecalcHeader && this.recalculateHeader()) { ++ return this.getChunkDataInputStream(chunkPos); ++ } ++ return ret; ++ // Paper end - recalculate header on regionfile corruption + } else if (i1 > byteBuffer.remaining()) { + LOGGER.error("Chunk {} stream is truncated: expected {} but read {}", chunkPos, i1, byteBuffer.remaining()); ++ // Paper start - recalculate header on regionfile corruption ++ if (this.canRecalcHeader && this.recalculateHeader()) { ++ return this.getChunkDataInputStream(chunkPos); ++ } ++ // Paper end - recalculate header on regionfile corruption + return null; + } else if (i1 < 0) { + LOGGER.error("Declared size {} of chunk {} is negative", _int, chunkPos); ++ // Paper start - recalculate header on regionfile corruption ++ if (this.canRecalcHeader && this.recalculateHeader()) { ++ return this.getChunkDataInputStream(chunkPos); ++ } ++ // Paper end - recalculate header on regionfile corruption + return null; + } else { + JvmProfiler.INSTANCE.onRegionFileRead(this.info, chunkPos, this.version, i1); +- return this.createChunkInputStream(chunkPos, b, createStream(byteBuffer, i1)); ++ // Paper start - recalculate header on regionfile corruption ++ final DataInputStream ret = this.createChunkInputStream(chunkPos, b, createStream(byteBuffer, i1)); ++ if (ret == null && this.canRecalcHeader && this.recalculateHeader()) { ++ return this.getChunkDataInputStream(chunkPos); ++ } ++ return ret; ++ // Paper end - recalculate header on regionfile corruption + } + } + } +@@ -361,9 +819,14 @@ public class RegionFile implements AutoCloseable, ca.spottedleaf.moonrise.patche + } + + private ByteBuffer createExternalStub() { ++ // Paper start - add version param ++ return this.createExternalStub(this.version); ++ } ++ private ByteBuffer createExternalStub(RegionFileVersion version) { ++ // Paper end - add version param + ByteBuffer byteBuffer = ByteBuffer.allocate(5); + byteBuffer.putInt(1); +- byteBuffer.put((byte)(this.version.getId() | 128)); ++ byteBuffer.put((byte)(version.getId() | 128)); + byteBuffer.flip(); + return byteBuffer; + } +diff --git a/net/minecraft/world/level/chunk/storage/RegionFileStorage.java b/net/minecraft/world/level/chunk/storage/RegionFileStorage.java +index d263f78fa610ce6f6fb5a0f5e064e3d8335c2199..dad7f94b611cf0fc68b1a3878c458233f6bb6d61 100644 +--- a/net/minecraft/world/level/chunk/storage/RegionFileStorage.java ++++ b/net/minecraft/world/level/chunk/storage/RegionFileStorage.java +@@ -23,6 +23,36 @@ public class RegionFileStorage implements AutoCloseable, ca.spottedleaf.moonrise + private final Path folder; + private final boolean sync; + ++ // Paper start - recalculate region file headers ++ private final boolean isChunkData; ++ ++ public static boolean isChunkDataFolder(Path path) { ++ return path.toFile().getName().equalsIgnoreCase("region"); ++ } ++ ++ @Nullable ++ public static ChunkPos getRegionFileCoordinates(Path file) { ++ String fileName = file.getFileName().toString(); ++ if (!fileName.startsWith("r.") || !fileName.endsWith(".mca")) { ++ return null; ++ } ++ ++ String[] split = fileName.split("\\."); ++ ++ if (split.length != 4) { ++ return null; ++ } ++ ++ try { ++ int x = Integer.parseInt(split[1]); ++ int z = Integer.parseInt(split[2]); ++ ++ return new ChunkPos(x << 5, z << 5); ++ } catch (NumberFormatException ex) { ++ return null; ++ } ++ } ++ // Paper end + // Paper start - rewrite chunk system + private static final int REGION_SHIFT = 5; + private static final int MAX_NON_EXISTING_CACHE = 1024 * 4; +@@ -216,6 +246,7 @@ public class RegionFileStorage implements AutoCloseable, ca.spottedleaf.moonrise + this.folder = folder; + this.sync = sync; + this.info = info; ++ this.isChunkData = isChunkDataFolder(this.folder); // Paper - recalculate region file headers + } + + @org.jetbrains.annotations.Contract("_, false -> !null") @Nullable private RegionFile getRegionFile(ChunkPos chunkPos, boolean existingOnly) throws IOException { // CraftBukkit +@@ -309,6 +340,19 @@ public class RegionFileStorage implements AutoCloseable, ca.spottedleaf.moonrise + } + + var4 = NbtIo.read(chunkDataInputStream); ++ // Paper start - recover from corrupt regionfile header ++ if (this.isChunkData) { ++ ChunkPos headerChunkPos = SerializableChunkData.getChunkCoordinate(var4); ++ if (!headerChunkPos.equals(chunkPos)) { ++ net.minecraft.server.MinecraftServer.LOGGER.error("Attempting to read chunk data at " + chunkPos + " but got chunk data for " + headerChunkPos + " instead! Attempting regionfile recalculation for regionfile " + regionFile.getPath().toAbsolutePath()); ++ if (regionFile.recalculateHeader()) { ++ return this.read(chunkPos); ++ } ++ net.minecraft.server.MinecraftServer.LOGGER.error("Can't recalculate regionfile header, regenerating chunk " + chunkPos + " for " + regionFile.getPath().toAbsolutePath()); ++ return null; ++ } ++ } ++ // Paper end - recover from corrupt regionfile header + } + + return var4; +diff --git a/net/minecraft/world/level/chunk/storage/RegionFileVersion.java b/net/minecraft/world/level/chunk/storage/RegionFileVersion.java +index 0c739ca5b01ac0ec35a11fd01c5fc65de97c2852..de7deee4b79c969a7797bd57b657a16404c15303 100644 +--- a/net/minecraft/world/level/chunk/storage/RegionFileVersion.java ++++ b/net/minecraft/world/level/chunk/storage/RegionFileVersion.java +@@ -21,7 +21,7 @@ import org.slf4j.Logger; + + public class RegionFileVersion { + private static final Logger LOGGER = LogUtils.getLogger(); +- private static final Int2ObjectMap<RegionFileVersion> VERSIONS = new Int2ObjectOpenHashMap<>(); ++ public static final Int2ObjectMap<RegionFileVersion> VERSIONS = new Int2ObjectOpenHashMap<>(); // Paper - private -> public + private static final Object2ObjectMap<String, RegionFileVersion> VERSIONS_BY_NAME = new Object2ObjectOpenHashMap<>(); + public static final RegionFileVersion VERSION_GZIP = register( + new RegionFileVersion( +diff --git a/net/minecraft/world/level/chunk/storage/SerializableChunkData.java b/net/minecraft/world/level/chunk/storage/SerializableChunkData.java +index 70a9972252576e039ac126f6057a6ed66b80cdfc..d783c3580ea274a0a9cb07449eb8037bc5a04d76 100644 +--- a/net/minecraft/world/level/chunk/storage/SerializableChunkData.java ++++ b/net/minecraft/world/level/chunk/storage/SerializableChunkData.java +@@ -120,6 +120,18 @@ public record SerializableChunkData( + } + } + // Paper end - guard against serializing mismatching coordinates ++ // Paper start - Attempt to recalculate regionfile header if it is corrupt ++ // TODO: Check on update ++ public static long getLastWorldSaveTime(final CompoundTag chunkData) { ++ final int dataVersion = ChunkStorage.getVersion(chunkData); ++ if (dataVersion < 2842) { // Level tag is removed after this version ++ final CompoundTag levelData = chunkData.getCompound("Level"); ++ return levelData.getLong("LastUpdate"); ++ } else { ++ return chunkData.getLong("LastUpdate"); ++ } ++ } ++ // Paper end - Attempt to recalculate regionfile header if it is corrupt + + // Paper start - Do not let the server load chunks from newer versions + private static final int CURRENT_DATA_VERSION = net.minecraft.SharedConstants.getCurrentVersion().getDataVersion().getVersion(); +@@ -604,7 +616,7 @@ public record SerializableChunkData( + compoundTag.putInt("xPos", this.chunkPos.x); + compoundTag.putInt("yPos", this.minSectionY); + compoundTag.putInt("zPos", this.chunkPos.z); +- compoundTag.putLong("LastUpdate", this.lastUpdateTime); ++ compoundTag.putLong("LastUpdate", this.lastUpdateTime); // Paper - Diff on change + compoundTag.putLong("InhabitedTime", this.inhabitedTime); + compoundTag.putString("Status", BuiltInRegistries.CHUNK_STATUS.getKey(this.chunkStatus).toString()); + if (this.blendingData != null) { |