From feccf6b859e83bd8f28408ad72c7854ae12b70bb Mon Sep 17 00:00:00 2001
From: eversinc33 <svrath@web.de>
Date: Fri, 3 Jan 2025 21:02:06 +0100
Subject: [PATCH] check for windows NTFS compression on database files

---
 src/blockchain_db/lmdb/db_lmdb.cpp | 64 ++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/src/blockchain_db/lmdb/db_lmdb.cpp b/src/blockchain_db/lmdb/db_lmdb.cpp
index d01119249..f85042d61 100644
--- a/src/blockchain_db/lmdb/db_lmdb.cpp
+++ b/src/blockchain_db/lmdb/db_lmdb.cpp
@@ -28,11 +28,16 @@
 #include "db_lmdb.h"
 
 #include <boost/filesystem.hpp>
+#include <boost/filesystem/fstream.hpp>
 #include <boost/format.hpp>
 #include <boost/circular_buffer.hpp>
 #include <memory>  // std::unique_ptr
 #include <cstring>  // memcpy
 
+#ifdef WIN32
+#include <winioctl.h>
+#endif
+
 #include "string_tools.h"
 #include "file_io_utils.h"
 #include "common/util.h"
@@ -1321,6 +1326,54 @@ BlockchainLMDB::BlockchainLMDB(bool batch_transactions): BlockchainDB()
   m_hardfork = nullptr;
 }
 
+#ifdef WIN32
+static bool disable_ntfs_compression(const boost::filesystem::path& filepath)
+{
+  DWORD file_attributes = ::GetFileAttributesW(filepath.c_str());
+  if (file_attributes == INVALID_FILE_ATTRIBUTES) 
+  {
+    MERROR("Failed to get " << filepath.string() << " file attributes. Error: " << ::GetLastError());
+    return false;
+  }
+  
+  if (!(file_attributes & FILE_ATTRIBUTE_COMPRESSED))
+    return true; // not compressed
+
+  LOG_PRINT_L1("Disabling NTFS compression for " << filepath.string());
+  HANDLE file_handle = ::CreateFileW(
+    filepath.c_str(),
+    GENERIC_READ | GENERIC_WRITE,                
+    FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+    nullptr,
+    OPEN_EXISTING,
+    boost::filesystem::is_directory(filepath) ? FILE_FLAG_BACKUP_SEMANTICS : 0, // Needed to open handles to directories
+    nullptr
+  );
+
+  if (file_handle == INVALID_HANDLE_VALUE) 
+  {
+    MERROR("Failed to open handle: " << filepath.string() << ". Error: " << ::GetLastError());
+    return false;
+  }
+
+  USHORT compression_state = COMPRESSION_FORMAT_NONE;
+  DWORD bytes_returned;
+  BOOL ok = ::DeviceIoControl(
+    file_handle,
+    FSCTL_SET_COMPRESSION,
+    &compression_state,            
+    sizeof(compression_state),       
+    nullptr,                        
+    0,                              
+    &bytes_returned,                 
+    nullptr                         
+  );
+
+  ::CloseHandle(file_handle);
+  return ok;
+}
+#endif
+
 void BlockchainLMDB::open(const std::string& filename, const int db_flags)
 {
   int result;
@@ -1347,6 +1400,17 @@ void BlockchainLMDB::open(const std::string& filename, const int db_flags)
     throw DB_ERROR("Database could not be opened");
   }
 
+#ifdef WIN32
+  // ensure NTFS compression is disabled on the directory and database file to avoid corruption of the blockchain 
+  if (!disable_ntfs_compression(filename)) 
+    LOG_PRINT_L0("Failed to disable NTFS compression on folder: " << filename << ". Error: " << ::GetLastError());
+  boost::filesystem::path datafile(filename);
+  datafile /= CRYPTONOTE_BLOCKCHAINDATA_FILENAME;
+  boost::filesystem::ofstream(datafile).close(); // touch the file to ensure it exists
+  if (!disable_ntfs_compression(datafile)) 
+    throw DB_ERROR("Database file is NTFS compressend and compression could not be disabled");
+#endif
+
   boost::optional<bool> is_hdd_result = tools::is_hdd(filename.c_str());
   if (is_hdd_result)
   {