1 files changed, 97 insertions, 0 deletions
diff --git a/patches/server/0746-Only-write-chunk-data-to-disk-if-it-serializes-witho.patch b/patches/server/0746-Only-write-chunk-data-to-disk-if-it-serializes-witho.patch
new file mode 100644
index 0000000000..0246c3f0d5
--- /dev/null
+++ b/patches/server/0746-Only-write-chunk-data-to-disk-if-it-serializes-witho.patch
@@ -0,0 +1,97 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <[email protected]>
+Date: Sun, 19 Dec 2021 09:13:41 -0800
+Subject: [PATCH] Only write chunk data to disk if it serializes without
+ throwing
+
+This ensures at least a valid version of the chunk exists
+on disk, even if outdated
+
+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
+index 9bae47f99336c377beb72c4b50b7f01cb4db15da..dcfe090c269d4cbcc2eb1b6f85392848bb34656c 100644
+--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
++++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
+@@ -1004,6 +1004,9 @@ public class RegionFile implements AutoCloseable {
+         }
+ 
+     }
++
++    public static final int MAX_CHUNK_SIZE = 500 * 1024 * 1024; // Paper - don't write garbage data to disk if writing serialization fails
++
+     // Paper end
+     private class ChunkBuffer extends ByteArrayOutputStream {
+ 
+@@ -1019,6 +1022,24 @@ public class RegionFile implements AutoCloseable {
+             this.pos = chunkcoordintpair;
+         }
+ 
++        // Paper start - don't write garbage data to disk if writing serialization fails
++        @Override
++        public void write(final int b) {
++            if (this.count > MAX_CHUNK_SIZE) {
++                throw new RegionFileStorage.RegionFileSizeException("Region file too large: " + this.count);
++            }
++            super.write(b);
++        }
++
++        @Override
++        public void write(final byte[] b, final int off, final int len) {
++            if (this.count + len > MAX_CHUNK_SIZE) {
++                throw new RegionFileStorage.RegionFileSizeException("Region file too large: " + (this.count + len));
++            }
++            super.write(b, off, len);
++        }
++        // Paper end
++
+         public void close() throws IOException {
+             ByteBuffer bytebuffer = ByteBuffer.wrap(this.buf, 0, this.count);
+ 
+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
+index c2643f61fe5efb62d15f0798db691c76c7674a6e..81554c321a78258ff78da3801f00d0fb90b9e113 100644
+--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
++++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
+@@ -345,10 +345,17 @@ public class RegionFileStorage implements AutoCloseable {
+                 NbtIo.write(nbt, (DataOutput) dataoutputstream);
+                 regionfile.setStatus(pos.x, pos.z, ChunkSerializer.getStatus(nbt)); // Paper - cache status on disk
+                 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
++                dataoutputstream.close(); // Paper - only write if successful
++            // Paper start - don't write garbage data to disk if writing serialization fails
++            } catch (RegionFileSizeException e) {
++                attempts = 5; // Don't retry
++                regionfile.clear(pos);
++                throw e;
++                // Paper end - don't write garbage data to disk if writing serialization fails
+             } catch (Throwable throwable) {
+                 if (dataoutputstream != null) {
+                     try {
+-                        dataoutputstream.close();
++                        //dataoutputstream.close(); // Paper - don't write garbage data to disk if writing serialization fails
+                     } catch (Throwable throwable1) {
+                         throwable.addSuppressed(throwable1);
+                     }
+@@ -356,10 +363,7 @@ public class RegionFileStorage implements AutoCloseable {
+ 
+                 throw throwable;
+             }
+-
+-            if (dataoutputstream != null) {
+-                dataoutputstream.close();
+-            }
++            // Paper - move into try block to only write if successfully serialized
+         }
+         // Paper start
+         return;
+@@ -405,4 +409,13 @@ public class RegionFileStorage implements AutoCloseable {
+         }
+ 
+     }
++
++    // Paper start
++    public static final class RegionFileSizeException extends RuntimeException {
++
++        public RegionFileSizeException(String message) {
++            super(message);
++        }
++    }
++    // Paper end
+ }