merge with libmdbx/xp

12 files changed, 512 insertions, 248 deletions

diff --git a/plugins/Dbx_mdbx/dbx_mdbx.vcxproj b/plugins/Dbx_mdbx/dbx_mdbx.vcxproj
index 54c0214bd5..0ef93cb590 100644
--- a/plugins/Dbx_mdbx/dbx_mdbx.vcxproj
+++ b/plugins/Dbx_mdbx/dbx_mdbx.vcxproj
@@ -46,6 +46,7 @@
     <ClCompile>

       <ExceptionHandling>Sync</ExceptionHandling>

       <PreprocessorDefinitions Condition="'$(Configuration)'=='Debug'">MDB_DEBUG=5;%(PreprocessorDefinitions)</PreprocessorDefinitions>

+      <PreprocessorDefinitions>MDBX_CONFIG_MANUAL_TLS_CALLBACK=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>

     </ClCompile>

   </ItemDefinitionGroup>

 </Project>
\ No newline at end of file
diff --git a/plugins/Dbx_mdbx/src/dbintf.cpp b/plugins/Dbx_mdbx/src/dbintf.cpp
index 5f8eaa4398..9fffe8f732 100644
--- a/plugins/Dbx_mdbx/src/dbintf.cpp
+++ b/plugins/Dbx_mdbx/src/dbintf.cpp
@@ -244,7 +244,7 @@ int CDbxMDBX::Map()
 	if (rc != MDBX_SUCCESS)

 		return EGROKPRF_CANTREAD;

 

-	unsigned int mode = MDBX_NOSUBDIR | MDBX_MAPASYNC | MDBX_WRITEMAP | MDBX_NOSYNC | MDBX_COALESCE;

+	unsigned int mode = MDBX_NOSUBDIR | MDBX_MAPASYNC | MDBX_WRITEMAP | MDBX_NOSYNC | MDBX_COALESCE | MDBX_EXCLUSIVE;

 	if (m_bReadOnly)

 		mode |= MDBX_RDONLY;

 

diff --git a/plugins/Dbx_mdbx/src/init.cpp b/plugins/Dbx_mdbx/src/init.cpp
index 6a85913bde..8998211776 100644
--- a/plugins/Dbx_mdbx/src/init.cpp
+++ b/plugins/Dbx_mdbx/src/init.cpp
@@ -23,8 +23,6 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 

 #include "stdafx.h"

 

-EXTERN_C void NTAPI tls_callback(PVOID module, DWORD reason, PVOID reserved);

-

 CMPlugin g_plugin;

 

 /////////////////////////////////////////////////////////////////////////////////////////

@@ -53,7 +51,7 @@ EXTERN_C void NTAPI tls_callback(PVOID module, DWORD reason, PVOID reserved);
 

 BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD reason, LPVOID reserved)

 {

-	tls_callback(hInstDLL, reason, reserved);

+	mdbx_dll_callback(hInstDLL, reason, reserved);

 	return TRUE;

 }

 

diff --git a/plugins/Dbx_mdbx/src/libmdbx/README-RU.md b/plugins/Dbx_mdbx/src/libmdbx/README-RU.md
index 233545552d..f4ae5e8f14 100644
--- a/plugins/Dbx_mdbx/src/libmdbx/README-RU.md
+++ b/plugins/Dbx_mdbx/src/libmdbx/README-RU.md
@@ -591,8 +591,8 @@ _libmdbx_ при этом не ведет WAL, а передает весь ко
 13. Исправленный вариант `mdbx_cursor_count()`, возвращающий корректное
 количество дубликатов для всех типов таблиц и любого положения курсора.
 
-14. Возможность открыть БД в эксклюзивном режиме посредством
-`mdbx_env_open_ex()`, например в целях её проверки.
+14. Возможность открыть БД в эксклюзивном режиме посредством флага
+`MDBX_EXCLUSIVE`, например в целях её проверки.
 
 15. Возможность закрыть БД в "грязном" состоянии (без сброса данных и
 формирования сильной точки фиксации) посредством `mdbx_env_close_ex()`.
diff --git a/plugins/Dbx_mdbx/src/libmdbx/README.md b/plugins/Dbx_mdbx/src/libmdbx/README.md
index 4820975679..1a046717ee 100644
--- a/plugins/Dbx_mdbx/src/libmdbx/README.md
+++ b/plugins/Dbx_mdbx/src/libmdbx/README.md
@@ -20,8 +20,6 @@ libmdbx
    6. [Asynchronous lazy data flushing](https://sites.fas.harvard.edu/~cs265/papers/kathuria-2008.pdf) to disk(s);
    7. etc...
 
-Don't miss [Java Native Interface](https://github.com/castortech/mdbxjni) by [Castor Technologies](https://castortech.com/).
-
 -----
 
 Nowadays MDBX intended for Linux, and support Windows (since
@@ -405,7 +403,7 @@ Improvements over LMDB
 
 13. Fixed `mdbx_cursor_count()`, which returns correct count of duplicated for all table types and any cursor position.
 
-14. Ability to open DB in exclusive mode via `mdbx_env_open_ex()`, e.g. for integrity check.
+14. Ability to open DB in exclusive mode with `MDBX_EXCLUSIVE` flag, e.g. for integrity check.
 
 15. Ability to close DB in "dirty" state (without data flush and creation of steady synchronization point)
     via `mdbx_env_close_ex()`.
diff --git a/plugins/Dbx_mdbx/src/libmdbx/mdbx.h b/plugins/Dbx_mdbx/src/libmdbx/mdbx.h
index 9758fe5738..2f28623424 100644
--- a/plugins/Dbx_mdbx/src/libmdbx/mdbx.h
+++ b/plugins/Dbx_mdbx/src/libmdbx/mdbx.h
@@ -85,6 +85,11 @@
 
 #include <windows.h>
 #include <winnt.h>
+
+#ifndef FSCTL_GET_EXTERNAL_BACKING
+#define FSCTL_GET_EXTERNAL_BACKING CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 196, METHOD_BUFFERED, FILE_ANY_ACCESS)
+#endif
+
 #ifndef __mode_t_defined
 typedef unsigned short mode_t;
 #endif
@@ -203,6 +208,24 @@ typedef struct mdbx_build_info {
 extern LIBMDBX_API const mdbx_version_info mdbx_version;
 extern LIBMDBX_API const mdbx_build_info mdbx_build;
 
+#if defined(_WIN32) || defined(_WIN64)
+
+/* Dll initialization callback for ability to dynamically load MDBX DLL by
+ * LoadLibrary() on Windows versions before Windows Vista. This function MUST be
+ * called once from DllMain() for each reason (DLL_PROCESS_ATTACH,
+ * DLL_PROCESS_DETACH, DLL_THREAD_ATTACH and DLL_THREAD_DETACH). Do this
+ * carefully and ONLY when actual Windows version don't support initialization
+ * via "TLS Directory" (e.g .CRT$XL[A-Z] sections in executable or dll file). */
+
+#ifndef MDBX_CONFIG_MANUAL_TLS_CALLBACK
+#define MDBX_CONFIG_MANUAL_TLS_CALLBACK 0
+#endif
+#if MDBX_CONFIG_MANUAL_TLS_CALLBACK
+void LIBMDBX_API NTAPI mdbx_dll_callback(PVOID module, DWORD reason,
+                                         PVOID reserved);
+#endif /* MDBX_CONFIG_MANUAL_TLS_CALLBACK */
+#endif /* Windows */
+
 /* The name of the lock file in the DB environment */
 #define MDBX_LOCKNAME "/mdbx.lck"
 /* The name of the data file in the DB environment */
@@ -270,9 +293,8 @@ typedef int(MDBX_cmp_func)(const MDBX_val *a, const MDBX_val *b);
 #define MDBX_MAPASYNC 0x100000u
 /* tie reader locktable slots to MDBX_txn objects instead of to threads */
 #define MDBX_NOTLS 0x200000u
-/* don't do any locking, caller must manage their own locks
- * WARNING: libmdbx don't support this mode. */
-#define MDBX_NOLOCK__UNSUPPORTED 0x400000u
+/* open DB in exclusive/monopolistic mode. */
+#define MDBX_EXCLUSIVE 0x400000u
 /* don't do readahead */
 #define MDBX_NORDAHEAD 0x800000u
 /* don't initialize malloc'd memory before writing to datafile */
@@ -652,8 +674,6 @@ LIBMDBX_API int mdbx_env_create(MDBX_env **penv);
  *   - MDBX_EAGAIN   - the environment was locked by another process. */
 LIBMDBX_API int mdbx_env_open(MDBX_env *env, const char *path, unsigned flags,
                               mode_t mode);
-LIBMDBX_API int mdbx_env_open_ex(MDBX_env *env, const char *path,
-                                 unsigned flags, mode_t mode, int *exclusive);
 
 /* Copy an MDBX environment to the specified path, with options.
  *
@@ -1637,9 +1657,7 @@ typedef int MDBX_pgvisitor_func(uint64_t pgno, unsigned pgnumber, void *ctx,
 LIBMDBX_API int mdbx_env_pgwalk(MDBX_txn *txn, MDBX_pgvisitor_func *visitor,
                                 void *ctx);
 
-typedef struct mdbx_canary {
-  uint64_t x, y, z, v;
-} mdbx_canary;
+typedef struct mdbx_canary { uint64_t x, y, z, v; } mdbx_canary;
 
 LIBMDBX_API int mdbx_canary_put(MDBX_txn *txn, const mdbx_canary *canary);
 LIBMDBX_API int mdbx_canary_get(MDBX_txn *txn, mdbx_canary *canary);
diff --git a/plugins/Dbx_mdbx/src/libmdbx/src/bits.h b/plugins/Dbx_mdbx/src/libmdbx/src/bits.h
index ccd4a581b2..f535d749de 100644
--- a/plugins/Dbx_mdbx/src/libmdbx/src/bits.h
+++ b/plugins/Dbx_mdbx/src/libmdbx/src/bits.h
@@ -23,11 +23,6 @@
 #   undef NDEBUG
 #endif
 
-/* Features under development */
-#ifndef MDBX_DEVEL
-#   define MDBX_DEVEL 1
-#endif
-
 /*----------------------------------------------------------------------------*/
 
 /* Should be defined before any includes */
@@ -39,6 +34,9 @@
 #endif
 
 #ifdef _MSC_VER
+#   if _MSC_VER < 1400
+#       error "Microsoft Visual C++ 8.0 (Visual Studio 2005) or later version is required"
+#   endif
 #   ifndef _CRT_SECURE_NO_WARNINGS
 #       define _CRT_SECURE_NO_WARNINGS
 #   endif
@@ -144,9 +142,9 @@
 #define MDBX_MAGIC UINT64_C(/* 56-bit prime */ 0x59659DBDEF4C11)
 
 /* The version number for a database's datafile format. */
-#define MDBX_DATA_VERSION ((MDBX_DEVEL) ? 255 : 2)
+#define MDBX_DATA_VERSION 2
 /* The version number for a database's lockfile format. */
-#define MDBX_LOCK_VERSION ((MDBX_DEVEL) ? 255 : 2)
+#define MDBX_LOCK_VERSION 2
 
 /* handle for the DB used to track free pages. */
 #define FREE_DBI 0
@@ -372,19 +370,19 @@ typedef struct MDBX_page {
 #define PAGEHDRSZ ((unsigned)offsetof(MDBX_page, mp_data))
 
 /* The maximum size of a database page.
- *
- * It is 64K, but value-PAGEHDRSZ must fit in MDBX_page.mp_upper.
- *
- * MDBX will use database pages < OS pages if needed.
- * That causes more I/O in write transactions: The OS must
- * know (read) the whole page before writing a partial page.
- *
- * Note that we don't currently support Huge pages. On Linux,
- * regular data files cannot use Huge pages, and in general
- * Huge pages aren't actually pageable. We rely on the OS
- * demand-pager to read our data and page it out when memory
- * pressure from other processes is high. So until OSs have
- * actual paging support for Huge pages, they're not viable. */
+*
+* It is 64K, but value-PAGEHDRSZ must fit in MDBX_page.mp_upper.
+*
+* MDBX will use database pages < OS pages if needed.
+* That causes more I/O in write transactions: The OS must
+* know (read) the whole page before writing a partial page.
+*
+* Note that we don't currently support Huge pages. On Linux,
+* regular data files cannot use Huge pages, and in general
+* Huge pages aren't actually pageable. We rely on the OS
+* demand-pager to read our data and page it out when memory
+* pressure from other processes is high. So until OSs have
+* actual paging support for Huge pages, they're not viable. */
 #define MAX_PAGESIZE 0x10000u
 #define MIN_PAGESIZE 512u
 
@@ -470,8 +468,10 @@ typedef struct MDBX_lockinfo {
    (uint16_t)(MDBX_LOCKINFO_WHOLE_SIZE + MDBX_CACHELINE_SIZE - 1))
 
 #define MDBX_DATA_MAGIC ((MDBX_MAGIC << 8) + MDBX_DATA_VERSION)
+#define MDBX_DATA_DEBUG ((MDBX_MAGIC << 8) + 255)
 
 #define MDBX_LOCK_MAGIC ((MDBX_MAGIC << 8) + MDBX_LOCK_VERSION)
+#define MDBX_LOCK_DEBUG ((MDBX_MAGIC << 8) + 255)
 
 /*----------------------------------------------------------------------------*/
 /* Two kind lists of pages (aka PNL) */
@@ -784,7 +784,7 @@ struct MDBX_env {
   } me_dbgeo;      /* */
 
 #if defined(_WIN32) || defined(_WIN64)
-  MDBX_shlock me_remap_guard;
+  MDBX_srwlock me_remap_guard;
   /* Workaround for LockFileEx and WriteFile multithread bug */
   CRITICAL_SECTION me_windowsbug_lock;
 #else
diff --git a/plugins/Dbx_mdbx/src/libmdbx/src/defs.h b/plugins/Dbx_mdbx/src/libmdbx/src/defs.h
index 6da5a96363..b6076cc1b3 100644
--- a/plugins/Dbx_mdbx/src/libmdbx/src/defs.h
+++ b/plugins/Dbx_mdbx/src/libmdbx/src/defs.h
@@ -103,10 +103,6 @@
 
 /*----------------------------------------------------------------------------*/
 
-#if !defined(__thread) && (defined(_MSC_VER) || defined(__DMC__))
-#   define __thread __declspec(thread)
-#endif /* __thread */
-
 #ifndef __alwaysinline
 #   if defined(__GNUC__) || __has_attribute(always_inline)
 #       define __alwaysinline __inline __attribute__((always_inline))
diff --git a/plugins/Dbx_mdbx/src/libmdbx/src/lck-windows.c b/plugins/Dbx_mdbx/src/libmdbx/src/lck-windows.c
index 209cfa07df..6e53212b20 100644
--- a/plugins/Dbx_mdbx/src/libmdbx/src/lck-windows.c
+++ b/plugins/Dbx_mdbx/src/libmdbx/src/lck-windows.c
@@ -24,13 +24,17 @@
  * LY
  */
 
-/*----------------------------------------------------------------------------*/
-/* rthc */
+static void mdbx_winnt_import(void);
 
-void NTAPI tls_callback(PVOID module, DWORD reason, PVOID reserved) {
+#if !MDBX_CONFIG_MANUAL_TLS_CALLBACK
+static
+#endif /* !MDBX_CONFIG_MANUAL_TLS_CALLBACK */
+    void NTAPI
+    mdbx_dll_callback(PVOID module, DWORD reason, PVOID reserved) {
   (void)reserved;
   switch (reason) {
   case DLL_PROCESS_ATTACH:
+    mdbx_winnt_import();
     mdbx_rthc_global_init();
     break;
   case DLL_PROCESS_DETACH:
@@ -45,6 +49,46 @@ void NTAPI tls_callback(PVOID module, DWORD reason, PVOID reserved) {
   }
 }
 
+#if !MDBX_CONFIG_MANUAL_TLS_CALLBACK
+/* *INDENT-OFF* */
+/* clang-format off */
+#if defined(_MSC_VER)
+#  pragma const_seg(push)
+#  pragma data_seg(push)
+
+#  ifdef _WIN64
+     /* kick a linker to create the TLS directory if not already done */
+#    pragma comment(linker, "/INCLUDE:_tls_used")
+     /* Force some symbol references. */
+#    pragma comment(linker, "/INCLUDE:mdbx_tls_anchor")
+     /* specific const-segment for WIN64 */
+#    pragma const_seg(".CRT$XLB")
+     const
+#  else
+     /* kick a linker to create the TLS directory if not already done */
+#    pragma comment(linker, "/INCLUDE:__tls_used")
+     /* Force some symbol references. */
+#    pragma comment(linker, "/INCLUDE:_mdbx_tls_anchor")
+     /* specific data-segment for WIN32 */
+#    pragma data_seg(".CRT$XLB")
+#  endif
+
+   __declspec(allocate(".CRT$XLB")) PIMAGE_TLS_CALLBACK mdbx_tls_anchor = mdbx_dll_callback;
+#  pragma data_seg(pop)
+#  pragma const_seg(pop)
+
+#elif defined(__GNUC__)
+#  ifdef _WIN64
+     const
+#  endif
+   PIMAGE_TLS_CALLBACK mdbx_tls_anchor __attribute__((section(".CRT$XLB"), used)) = mdbx_dll_callback;
+#else
+#  error FIXME
+#endif
+/* *INDENT-ON* */
+/* clang-format on */
+#endif /* !MDBX_CONFIG_MANUAL_TLS_CALLBACK */
+
 /*----------------------------------------------------------------------------*/
 
 #define LCK_SHARED 0
@@ -54,11 +98,17 @@ void NTAPI tls_callback(PVOID module, DWORD reason, PVOID reserved) {
 
 static __inline BOOL flock(mdbx_filehandle_t fd, DWORD flags, uint64_t offset,
                            size_t bytes) {
-  return TRUE;
+  OVERLAPPED ov;
+  ov.hEvent = 0;
+  ov.Offset = (DWORD)offset;
+  ov.OffsetHigh = HIGH_DWORD(offset);
+  return LockFileEx(fd, flags, 0, (DWORD)bytes, HIGH_DWORD(bytes), &ov);
 }
 
-static __inline BOOL funlock(mdbx_filehandle_t fd, uint64_t offset, size_t bytes) {
-  return TRUE;
+static __inline BOOL funlock(mdbx_filehandle_t fd, uint64_t offset,
+                             size_t bytes) {
+  return UnlockFile(fd, (DWORD)offset, HIGH_DWORD(offset), (DWORD)bytes,
+                    HIGH_DWORD(bytes));
 }
 
 /*----------------------------------------------------------------------------*/
@@ -82,9 +132,9 @@ int mdbx_txn_lock(MDBX_env *env, bool dontwait) {
     EnterCriticalSection(&env->me_windowsbug_lock);
   }
 
-  if (flock(env->me_fd,
-            dontwait ? (LCK_EXCLUSIVE | LCK_DONTWAIT)
-                     : (LCK_EXCLUSIVE | LCK_WAITFOR),
+  if ((env->me_flags & MDBX_EXCLUSIVE) ||
+      flock(env->me_fd, dontwait ? (LCK_EXCLUSIVE | LCK_DONTWAIT)
+                                 : (LCK_EXCLUSIVE | LCK_WAITFOR),
             LCK_BODY))
     return MDBX_SUCCESS;
   int rc = GetLastError();
@@ -93,7 +143,8 @@ int mdbx_txn_lock(MDBX_env *env, bool dontwait) {
 }
 
 void mdbx_txn_unlock(MDBX_env *env) {
-  int rc = funlock(env->me_fd, LCK_BODY);
+  int rc = (env->me_flags & MDBX_EXCLUSIVE) ? TRUE
+                                            : funlock(env->me_fd, LCK_BODY);
   LeaveCriticalSection(&env->me_windowsbug_lock);
   if (!rc)
     mdbx_panic("%s failed: errcode %u", mdbx_func_, GetLastError());
@@ -111,26 +162,28 @@ void mdbx_txn_unlock(MDBX_env *env) {
 #define LCK_UPPER LCK_UP_OFFSET, LCK_UP_LEN
 
 int mdbx_rdt_lock(MDBX_env *env) {
-  mdbx_shlock_acquireShared(&env->me_remap_guard);
+  mdbx_srwlock_AcquireShared(&env->me_remap_guard);
   if (env->me_lfd == INVALID_HANDLE_VALUE)
     return MDBX_SUCCESS; /* readonly database in readonly filesystem */
 
   /* transite from S-? (used) to S-E (locked), e.g. exclusive lock upper-part */
-  if (flock(env->me_lfd, LCK_EXCLUSIVE | LCK_WAITFOR, LCK_UPPER))
+  if ((env->me_flags & MDBX_EXCLUSIVE) ||
+      flock(env->me_lfd, LCK_EXCLUSIVE | LCK_WAITFOR, LCK_UPPER))
     return MDBX_SUCCESS;
 
   int rc = GetLastError();
-  mdbx_shlock_releaseShared(&env->me_remap_guard);
+  mdbx_srwlock_ReleaseShared(&env->me_remap_guard);
   return rc;
 }
 
 void mdbx_rdt_unlock(MDBX_env *env) {
   if (env->me_lfd != INVALID_HANDLE_VALUE) {
     /* transite from S-E (locked) to S-? (used), e.g. unlock upper-part */
-    if (!funlock(env->me_lfd, LCK_UPPER))
+    if ((env->me_flags & MDBX_EXCLUSIVE) == 0 &&
+        !funlock(env->me_lfd, LCK_UPPER))
       mdbx_panic("%s failed: errcode %u", mdbx_func_, GetLastError());
   }
-  mdbx_shlock_releaseShared(&env->me_remap_guard);
+  mdbx_srwlock_ReleaseShared(&env->me_remap_guard);
 }
 
 static int suspend_and_append(mdbx_handle_array_t **array,
@@ -309,7 +362,7 @@ static int internal_seize_lck(HANDLE lfd) {
                "?-E(middle) >> S-E(locked)", rc);
 
   /* 8) now on S-E (locked) or still on ?-E (middle),
-   *    transite to S-? (used) or ?-? (free) */
+  *    transite to S-? (used) or ?-? (free) */
   if (!funlock(lfd, LCK_UPPER))
     mdbx_panic("%s(%s) failed: errcode %u", mdbx_func_,
                "X-E(locked/middle) >> X-?(used/free)", GetLastError());
@@ -322,6 +375,9 @@ int mdbx_lck_seize(MDBX_env *env) {
   int rc;
 
   assert(env->me_fd != INVALID_HANDLE_VALUE);
+  if (env->me_flags & MDBX_EXCLUSIVE)
+    return MDBX_RESULT_TRUE /* files were must be opened non-shareable */;
+
   if (env->me_lfd == INVALID_HANDLE_VALUE) {
     /* LY: without-lck mode (e.g. on read-only filesystem) */
     mdbx_jitter4testing(false);
@@ -364,6 +420,9 @@ int mdbx_lck_downgrade(MDBX_env *env, bool complete) {
   assert(env->me_fd != INVALID_HANDLE_VALUE);
   assert(env->me_lfd != INVALID_HANDLE_VALUE);
 
+  if (env->me_flags & MDBX_EXCLUSIVE)
+    return MDBX_SUCCESS /* files were must be opened non-shareable */;
+
   /* 1) must be at E-E (exclusive-write) */
   if (!complete) {
     /* transite from E-E to E_? (exclusive-read) */
@@ -398,6 +457,10 @@ int mdbx_lck_upgrade(MDBX_env *env) {
   /* Transite from locked state (S-E) to exclusive-write (E-E) */
   assert(env->me_fd != INVALID_HANDLE_VALUE);
   assert(env->me_lfd != INVALID_HANDLE_VALUE);
+  assert((env->me_flags & MDBX_EXCLUSIVE) == 0);
+
+  if (env->me_flags & MDBX_EXCLUSIVE)
+    return MDBX_RESULT_TRUE /* files were must be opened non-shareable */;
 
   /* 1) must be at S-E (locked), transite to ?_E (middle) */
   if (!funlock(env->me_lfd, LCK_LOWER))
@@ -436,7 +499,49 @@ int mdbx_lck_upgrade(MDBX_env *env) {
 }
 
 void mdbx_lck_destroy(MDBX_env *env) {
-  SetLastError(ERROR_SUCCESS);
+  int rc;
+
+  if (env->me_lfd != INVALID_HANDLE_VALUE) {
+    /* double `unlock` for robustly remove overlapped shared/exclusive locks */
+    while (funlock(env->me_lfd, LCK_LOWER))
+      ;
+    rc = GetLastError();
+    assert(rc == ERROR_NOT_LOCKED);
+    (void)rc;
+    SetLastError(ERROR_SUCCESS);
+
+    while (funlock(env->me_lfd, LCK_UPPER))
+      ;
+    rc = GetLastError();
+    assert(rc == ERROR_NOT_LOCKED);
+    (void)rc;
+    SetLastError(ERROR_SUCCESS);
+  }
+
+  if (env->me_fd != INVALID_HANDLE_VALUE) {
+    /* explicitly unlock to avoid latency for other processes (windows kernel
+     * releases such locks via deferred queues) */
+    while (funlock(env->me_fd, LCK_BODY))
+      ;
+    rc = GetLastError();
+    assert(rc == ERROR_NOT_LOCKED);
+    (void)rc;
+    SetLastError(ERROR_SUCCESS);
+
+    while (funlock(env->me_fd, LCK_META))
+      ;
+    rc = GetLastError();
+    assert(rc == ERROR_NOT_LOCKED);
+    (void)rc;
+    SetLastError(ERROR_SUCCESS);
+
+    while (funlock(env->me_fd, LCK_WHOLE))
+      ;
+    rc = GetLastError();
+    assert(rc == ERROR_NOT_LOCKED);
+    (void)rc;
+    SetLastError(ERROR_SUCCESS);
+  }
 }
 
 /*----------------------------------------------------------------------------*/
@@ -488,87 +593,120 @@ int mdbx_rpid_check(MDBX_env *env, mdbx_pid_t pid) {
 }
 
 //----------------------------------------------------------------------------
-// shared lock
-//  Copyright (C) 1995-2002 Brad Wilson
-
-typedef void (WINAPI *pfnSrwFunc)(PSRWLOCK);
-
-static pfnSrwFunc fnLockInit = 0, fnLockShared = 0, fnUnlockShared = 0, fnLockExcl = 0, fnUnlockExcl = 0;
-
-void mdbx_shlock_init(MDBX_shlock *lck) {
-  HINSTANCE hInst = GetModuleHandleA("kernel32.dll");
-  fnLockInit = (pfnSrwFunc)GetProcAddress(hInst, "InitializeSRWLock");
-  if (fnLockInit != NULL) {
-    fnLockShared = (pfnSrwFunc)GetProcAddress(hInst, "AcquireSRWLockShared");
-    fnUnlockShared = (pfnSrwFunc)GetProcAddress(hInst, "ReleaseSRWLockShared");
-    fnLockExcl = (pfnSrwFunc)GetProcAddress(hInst, "AcquireSRWLockExclusive");
-    fnUnlockExcl = (pfnSrwFunc)GetProcAddress(hInst, "ReleaseSRWLockExclusive");
+// Stub for slim read-write lock
+// Copyright (C) 1995-2002 Brad Wilson
 
-    fnLockInit(&lck->srwLock);
-  } else
-    lck->readerCount = lck->writerCount = 0;
+static void WINAPI stub_srwlock_Init(MDBX_srwlock *srwl) {
+  srwl->readerCount = srwl->writerCount = 0;
 }
 
-void mdbx_shlock_acquireShared(MDBX_shlock *lck) {
-  if (fnLockShared) {
-    fnLockShared(&lck->srwLock);
-    return;
-  }
+static void WINAPI stub_srwlock_AcquireShared(MDBX_srwlock *srwl) {
+  while (true) {
+    assert(srwl->writerCount >= 0 && srwl->readerCount >= 0);
 
-  while (1) {
     //  If there's a writer already, spin without unnecessarily
     //  interlocking the CPUs
-
-    if (lck->writerCount != 0) {
+    if (srwl->writerCount != 0) {
       YieldProcessor();
       continue;
     }
 
     //  Add to the readers list
-
-    _InterlockedIncrement((long *)&lck->readerCount);
+    _InterlockedIncrement(&srwl->readerCount);
 
     // Check for writers again (we may have been pre-empted). If
     // there are no writers writing or waiting, then we're done.
-    if (lck->writerCount == 0)
+    if (srwl->writerCount == 0)
       break;
 
     // Remove from the readers list, spin, try again
-    _InterlockedDecrement((long *)&lck->readerCount);
+    _InterlockedDecrement(&srwl->readerCount);
     YieldProcessor();
   }
 }
 
-void mdbx_shlock_releaseShared(MDBX_shlock *lck) {
-  if (fnUnlockShared)
-    fnUnlockShared(&lck->srwLock);
-  else
-    _InterlockedDecrement((long *)&lck->readerCount);
+static void WINAPI stub_srwlock_ReleaseShared(MDBX_srwlock *srwl) {
+  assert(srwl->readerCount > 0);
+  _InterlockedDecrement(&srwl->readerCount);
 }
 
-void mdbx_shlock_acquireExclusive(MDBX_shlock *lck) {
-  if (fnLockExcl) {
-    fnLockShared(&lck->srwLock);
-    return;
-  }
+static void WINAPI stub_srwlock_AcquireExclusive(MDBX_srwlock *srwl) {
+  while (true) {
+    assert(srwl->writerCount >= 0 && srwl->readerCount >= 0);
 
-  // See if we can become the writer (expensive, because it inter-
-  // locks the CPUs, so writing should be an infrequent process)
-  while (_InterlockedExchange((long *)&lck->writerCount, 1) == 1) {
-    YieldProcessor();
+    //  If there's a writer already, spin without unnecessarily
+    //  interlocking the CPUs
+    if (srwl->writerCount != 0) {
+      YieldProcessor();
+      continue;
+    }
+
+    // See if we can become the writer (expensive, because it inter-
+    // locks the CPUs, so writing should be an infrequent process)
+    if (_InterlockedExchange(&srwl->writerCount, 1) == 0)
+      break;
   }
 
   // Now we're the writer, but there may be outstanding readers.
   // Spin until there aren't any more; new readers will wait now
   // that we're the writer.
-  while (lck->readerCount != 0) {
+  while (srwl->readerCount != 0) {
+    assert(srwl->writerCount >= 0 && srwl->readerCount >= 0);
     YieldProcessor();
   }
 }
 
-void mdbx_shlock_releaseExclusive(MDBX_shlock *lck) {
-  if (fnUnlockExcl)
-    fnUnlockExcl(&lck->srwLock);
-  else
-    lck->writerCount = 0;
+static void WINAPI stub_srwlock_ReleaseExclusive(MDBX_srwlock *srwl) {
+  assert(srwl->writerCount == 1 && srwl->readerCount >= 0);
+  srwl->writerCount = 0;
+}
+
+MDBX_srwlock_function mdbx_srwlock_Init, mdbx_srwlock_AcquireShared,
+    mdbx_srwlock_ReleaseShared, mdbx_srwlock_AcquireExclusive,
+    mdbx_srwlock_ReleaseExclusive;
+
+/*----------------------------------------------------------------------------*/
+
+MDBX_GetFileInformationByHandleEx mdbx_GetFileInformationByHandleEx;
+MDBX_GetVolumeInformationByHandleW mdbx_GetVolumeInformationByHandleW;
+MDBX_GetFinalPathNameByHandleW mdbx_GetFinalPathNameByHandleW;
+MDBX_NtFsControlFile mdbx_NtFsControlFile;
+
+static void mdbx_winnt_import(void) {
+  const HINSTANCE hKernel32dll = GetModuleHandleA("kernel32.dll");
+  const MDBX_srwlock_function init =
+      (MDBX_srwlock_function)GetProcAddress(hKernel32dll, "InitializeSRWLock");
+  if (init != NULL) {
+    mdbx_srwlock_Init = init;
+    mdbx_srwlock_AcquireShared = (MDBX_srwlock_function)GetProcAddress(
+        hKernel32dll, "AcquireSRWLockShared");
+    mdbx_srwlock_ReleaseShared = (MDBX_srwlock_function)GetProcAddress(
+        hKernel32dll, "ReleaseSRWLockShared");
+    mdbx_srwlock_AcquireExclusive = (MDBX_srwlock_function)GetProcAddress(
+        hKernel32dll, "AcquireSRWLockExclusive");
+    mdbx_srwlock_ReleaseExclusive = (MDBX_srwlock_function)GetProcAddress(
+        hKernel32dll, "ReleaseSRWLockExclusive");
+  } else {
+    mdbx_srwlock_Init = stub_srwlock_Init;
+    mdbx_srwlock_AcquireShared = stub_srwlock_AcquireShared;
+    mdbx_srwlock_ReleaseShared = stub_srwlock_ReleaseShared;
+    mdbx_srwlock_AcquireExclusive = stub_srwlock_AcquireExclusive;
+    mdbx_srwlock_ReleaseExclusive = stub_srwlock_ReleaseExclusive;
+  }
+
+  mdbx_GetFileInformationByHandleEx =
+      (MDBX_GetFileInformationByHandleEx)GetProcAddress(
+          hKernel32dll, "GetFileInformationByHandleEx");
+
+  mdbx_GetVolumeInformationByHandleW =
+      (MDBX_GetVolumeInformationByHandleW)GetProcAddress(
+          hKernel32dll, "GetVolumeInformationByHandleW");
+
+  mdbx_GetFinalPathNameByHandleW =
+      (MDBX_GetFinalPathNameByHandleW)GetProcAddress(
+          hKernel32dll, "GetFinalPathNameByHandleW");
+
+  const HINSTANCE hNtdll = GetModuleHandleA("ntdll.dll");
+  mdbx_NtFsControlFile =
+      (MDBX_NtFsControlFile)GetProcAddress(hNtdll, "NtFsControlFile");
 }
diff --git a/plugins/Dbx_mdbx/src/libmdbx/src/mdbx.c b/plugins/Dbx_mdbx/src/libmdbx/src/mdbx.c
index fa51bb2309..44b2093d0b 100644
--- a/plugins/Dbx_mdbx/src/libmdbx/src/mdbx.c
+++ b/plugins/Dbx_mdbx/src/libmdbx/src/mdbx.c
@@ -42,8 +42,8 @@
 int __hot mdbx_e2k_memcmp_bug_workaround(const void *s1, const void *s2,
                                          size_t n) {
   if (unlikely(n > 42
-               /* LY: align followed access if reasonable possible */
-               && (((uintptr_t)s1) & 7) != 0 &&
+               /* LY: align followed access if reasonable possible */ &&
+               (((uintptr_t)s1) & 7) != 0 &&
                (((uintptr_t)s1) & 7) == (((uintptr_t)s2) & 7))) {
     if (((uintptr_t)s1) & 1) {
       const int diff = *(uint8_t *)s1 - *(uint8_t *)s2;
@@ -1134,7 +1134,7 @@ const char *__cold mdbx_strerror(int errnum) {
   const char *msg = __mdbx_strerr(errnum);
   if (!msg) {
 #ifdef _MSC_VER
-    static __thread char buffer[1024];
+    static char buffer[1024];
     size_t size = FormatMessageA(
         FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL,
         errnum, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buffer,
@@ -2003,7 +2003,7 @@ static int mdbx_mapresize(MDBX_env *env, const pgno_t size_pgno,
   /* Acquire guard in exclusive mode for:
    *   - to avoid collision between read and write txns around env->me_dbgeo;
    *   - to avoid attachment of new reading threads (see mdbx_rdt_lock); */
-  mdbx_shlock_acquireExclusive(&env->me_remap_guard);
+  mdbx_srwlock_AcquireExclusive(&env->me_remap_guard);
   mdbx_handle_array_t *suspended = NULL;
   mdbx_handle_array_t array_onstack;
   int rc = MDBX_SUCCESS;
@@ -2041,11 +2041,6 @@ static int mdbx_mapresize(MDBX_env *env, const pgno_t size_pgno,
 
 bailout:
   if (rc == MDBX_SUCCESS) {
-#if defined(_WIN32) || defined(_WIN64)
-    assert(size_bytes == env->me_dxb_mmap.current);
-    assert(size_bytes <= env->me_dxb_mmap.filesize);
-    assert(limit_bytes == env->me_dxb_mmap.length);
-#endif
     env->me_dbgeo.now = size_bytes;
     env->me_dbgeo.upper = limit_bytes;
     if (env->me_txn) {
@@ -2083,7 +2078,7 @@ bailout:
 
 #if defined(_WIN32) || defined(_WIN64)
   int err = MDBX_SUCCESS;
-  mdbx_shlock_releaseExclusive(&env->me_remap_guard);
+  mdbx_srwlock_ReleaseExclusive(&env->me_remap_guard);
   if (suspended) {
     err = mdbx_resume_threads_after_remap(suspended);
     if (suspended != &array_onstack)
@@ -4346,7 +4341,8 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta,
       return MDBX_INVALID;
     }
 
-    if (page.mp_meta.mm_magic_and_version != MDBX_DATA_MAGIC) {
+    if (page.mp_meta.mm_magic_and_version != MDBX_DATA_MAGIC &&
+        page.mp_meta.mm_magic_and_version != MDBX_DATA_DEBUG) {
       mdbx_error("meta[%u] has invalid magic/version %" PRIx64, meta_number,
                  page.mp_meta.mm_magic_and_version);
       return ((page.mp_meta.mm_magic_and_version >> 8) != MDBX_MAGIC)
@@ -4733,8 +4729,9 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
   mdbx_assert(env, !mdbx_meta_eq(env, pending, meta2));
 
   mdbx_assert(env, ((env->me_flags ^ flags) & MDBX_WRITEMAP) == 0);
-  mdbx_ensure(env, target == head || mdbx_meta_txnid_stable(env, target) <
-                                         pending->mm_txnid_a);
+  mdbx_ensure(env,
+              target == head ||
+                  mdbx_meta_txnid_stable(env, target) < pending->mm_txnid_a);
   if (env->me_flags & MDBX_WRITEMAP) {
     mdbx_jitter4testing(true);
     if (likely(target != head)) {
@@ -4912,7 +4909,7 @@ int __cold mdbx_env_create(MDBX_env **penv) {
     goto bailout;
 
 #if defined(_WIN32) || defined(_WIN64)
-  mdbx_shlock_init(&env->me_remap_guard);
+  mdbx_srwlock_Init(&env->me_remap_guard);
   InitializeCriticalSection(&env->me_windowsbug_lock);
 #else
   rc = mdbx_fastmutex_init(&env->me_remap_guard);
@@ -5583,7 +5580,8 @@ static int __cold mdbx_setup_lck(MDBX_env *env, char *lck_pathname,
   assert(env->me_fd != INVALID_HANDLE_VALUE);
   assert(env->me_lfd == INVALID_HANDLE_VALUE);
 
-  int err = mdbx_openfile(lck_pathname, O_RDWR | O_CREAT, mode, &env->me_lfd);
+  int err = mdbx_openfile(lck_pathname, O_RDWR | O_CREAT, mode, &env->me_lfd,
+                          (env->me_flags & MDBX_EXCLUSIVE) ? true : false);
   if (err != MDBX_SUCCESS) {
     if (err != MDBX_EROFS || (env->me_flags & MDBX_RDONLY) == 0)
       return err;
@@ -5626,10 +5624,14 @@ static int __cold mdbx_setup_lck(MDBX_env *env, char *lck_pathname,
         return err;
       size = wanna;
     }
-  } else if (size > SSIZE_MAX || (size & (env->me_os_psize - 1)) ||
-             size < env->me_os_psize) {
-    mdbx_notice("lck-file has invalid size %" PRIu64 " bytes", size);
-    return MDBX_PROBLEM;
+  } else {
+    if (env->me_flags & MDBX_EXCLUSIVE)
+      return MDBX_BUSY;
+    if (size > SSIZE_MAX || (size & (env->me_os_psize - 1)) ||
+        size < env->me_os_psize) {
+      mdbx_notice("lck-file has invalid size %" PRIu64 " bytes", size);
+      return MDBX_PROBLEM;
+    }
   }
 
   const size_t maxreaders =
@@ -5673,7 +5675,8 @@ static int __cold mdbx_setup_lck(MDBX_env *env, char *lck_pathname,
     env->me_lck->mti_magic_and_version = MDBX_LOCK_MAGIC;
     env->me_lck->mti_os_and_format = MDBX_LOCK_FORMAT;
   } else {
-    if (env->me_lck->mti_magic_and_version != MDBX_LOCK_MAGIC) {
+    if (env->me_lck->mti_magic_and_version != MDBX_LOCK_MAGIC &&
+        env->me_lck->mti_magic_and_version != MDBX_LOCK_DEBUG) {
       mdbx_error("lock region has invalid magic/version");
       return ((env->me_lck->mti_magic_and_version >> 8) != MDBX_MAGIC)
                  ? MDBX_INVALID
@@ -5699,24 +5702,27 @@ static int __cold mdbx_setup_lck(MDBX_env *env, char *lck_pathname,
    MDBX_COALESCE | MDBX_PAGEPERTURB)
 #define CHANGELESS                                                             \
   (MDBX_NOSUBDIR | MDBX_RDONLY | MDBX_WRITEMAP | MDBX_NOTLS | MDBX_NORDAHEAD | \
-   MDBX_LIFORECLAIM)
+   MDBX_LIFORECLAIM | MDBX_EXCLUSIVE)
 
 #if VALID_FLAGS & PERSISTENT_FLAGS & (CHANGEABLE | CHANGELESS)
 #error "Persistent DB flags & env flags overlap, but both go in mm_flags"
 #endif
 
-int __cold mdbx_env_open_ex(MDBX_env *env, const char *path, unsigned flags,
-                            mode_t mode, int *exclusive) {
+int __cold mdbx_env_open(MDBX_env *env, const char *path, unsigned flags,
+                         mode_t mode) {
   if (unlikely(!env || !path))
     return MDBX_EINVAL;
 
   if (unlikely(env->me_signature != MDBX_ME_SIGNATURE))
     return MDBX_EBADSIGN;
 
-  if (env->me_fd != INVALID_HANDLE_VALUE ||
-      (flags & ~(CHANGEABLE | CHANGELESS)))
+  if (flags & ~(CHANGEABLE | CHANGELESS))
     return MDBX_EINVAL;
 
+  if (env->me_fd != INVALID_HANDLE_VALUE ||
+      (env->me_flags & MDBX_ENV_ACTIVE) != 0)
+    return MDBX_EPERM;
+
   size_t len_full, len = strlen(path);
   if (flags & MDBX_NOSUBDIR) {
     len_full = len + sizeof(MDBX_LOCK_SUFFIX) + len + 1;
@@ -5750,7 +5756,9 @@ int __cold mdbx_env_open_ex(MDBX_env *env, const char *path, unsigned flags,
           (env->me_dirtylist = calloc(MDBX_PNL_UM_SIZE, sizeof(MDBX_ID2)))))
       rc = MDBX_ENOMEM;
   }
-  env->me_flags = flags |= MDBX_ENV_ACTIVE;
+
+  const uint32_t saved_me_flags = env->me_flags;
+  env->me_flags = flags | MDBX_ENV_ACTIVE;
   if (rc)
     goto bailout;
 
@@ -5770,7 +5778,8 @@ int __cold mdbx_env_open_ex(MDBX_env *env, const char *path, unsigned flags,
   else
     oflags = O_RDWR | O_CREAT;
 
-  rc = mdbx_openfile(dxb_pathname, oflags, mode, &env->me_fd);
+  rc = mdbx_openfile(dxb_pathname, oflags, mode, &env->me_fd,
+                     (env->me_flags & MDBX_EXCLUSIVE) ? true : false);
   if (rc != MDBX_SUCCESS)
     goto bailout;
 
@@ -5791,7 +5800,7 @@ int __cold mdbx_env_open_ex(MDBX_env *env, const char *path, unsigned flags,
       MDBX_WRITEMAP | MDBX_NOSYNC | MDBX_NOMETASYNC | MDBX_MAPASYNC;
   if (lck_rc == MDBX_RESULT_TRUE) {
     env->me_lck->mti_envmode = env->me_flags & (mode_flags | MDBX_RDONLY);
-    if (exclusive == NULL || *exclusive < 2) {
+    if ((env->me_flags & MDBX_EXCLUSIVE) == 0) {
       /* LY: downgrade lock only if exclusive access not requested.
        *     in case exclusive==1, just leave value as is. */
       rc = mdbx_lck_downgrade(env, true);
@@ -5803,10 +5812,6 @@ int __cold mdbx_env_open_ex(MDBX_env *env, const char *path, unsigned flags,
     if (rc != MDBX_SUCCESS)
       goto bailout;
   } else {
-    if (exclusive) {
-      /* LY: just indicate that is not an exclusive access. */
-      *exclusive = 0;
-    }
     if ((env->me_flags & MDBX_RDONLY) == 0) {
       while (env->me_lck->mti_envmode == MDBX_RDONLY) {
         if (mdbx_atomic_compare_and_swap32(&env->me_lck->mti_envmode,
@@ -5834,9 +5839,9 @@ int __cold mdbx_env_open_ex(MDBX_env *env, const char *path, unsigned flags,
   if ((flags & MDBX_RDONLY) == 0) {
     MDBX_txn *txn;
     int tsize = sizeof(MDBX_txn),
-        size =
-            tsize + env->me_maxdbs * (sizeof(MDBX_db) + sizeof(MDBX_cursor *) +
-                                      sizeof(unsigned) + 1);
+        size = tsize +
+               env->me_maxdbs * (sizeof(MDBX_db) + sizeof(MDBX_cursor *) +
+                                 sizeof(unsigned) + 1);
     if ((env->me_pbuf = calloc(1, env->me_psize)) && (txn = calloc(1, size))) {
       txn->mt_dbs = (MDBX_db *)((char *)txn + tsize);
       txn->mt_cursors = (MDBX_cursor **)(txn->mt_dbs + env->me_maxdbs);
@@ -5871,17 +5876,14 @@ int __cold mdbx_env_open_ex(MDBX_env *env, const char *path, unsigned flags,
 #endif
 
 bailout:
-  if (rc)
+  if (rc) {
     mdbx_env_close0(env);
+    env->me_flags = saved_me_flags;
+  }
   free(lck_pathname);
   return rc;
 }
 
-int __cold mdbx_env_open(MDBX_env *env, const char *path, unsigned flags,
-                         mode_t mode) {
-  return mdbx_env_open_ex(env, path, flags, mode, NULL);
-}
-
 /* Destroy resources from mdbx_env_open(), clear our readers & DBIs */
 static void __cold mdbx_env_close0(MDBX_env *env) {
   if (!(env->me_flags & MDBX_ENV_ACTIVE))
@@ -5906,10 +5908,8 @@ static void __cold mdbx_env_close0(MDBX_env *env) {
   }
   mdbx_pnl_free(env->me_free_pgs);
 
-  if (env->me_flags & MDBX_ENV_TXKEY) {
+  if (env->me_flags & MDBX_ENV_TXKEY)
     mdbx_rthc_remove(env->me_txkey);
-    env->me_flags &= ~MDBX_ENV_TXKEY;
-  }
 
   if (env->me_map) {
     mdbx_munmap(&env->me_dxb_mmap);
@@ -5925,7 +5925,6 @@ static void __cold mdbx_env_close0(MDBX_env *env) {
 
   if (env->me_lck)
     mdbx_munmap(&env->me_lck_mmap);
-  env->me_pid = 0;
   env->me_oldest = nullptr;
 
   mdbx_lck_destroy(env);
@@ -5933,6 +5932,7 @@ static void __cold mdbx_env_close0(MDBX_env *env) {
     (void)mdbx_closefile(env->me_lfd);
     env->me_lfd = INVALID_HANDLE_VALUE;
   }
+  env->me_flags = 0;
 }
 
 int __cold mdbx_env_close_ex(MDBX_env *env, int dont_sync) {
@@ -5983,6 +5983,7 @@ int __cold mdbx_env_close_ex(MDBX_env *env, int dont_sync) {
               mdbx_fastmutex_destroy(&env->me_remap_guard) == MDBX_SUCCESS);
 #endif /* Windows */
 
+  env->me_pid = 0;
   env->me_signature = 0;
   free(env);
 
@@ -6084,7 +6085,7 @@ static int __hot mdbx_cmp_int_ua(const MDBX_val *a, const MDBX_val *b) {
     } while (pa != a->iov_base);
     return diff;
   }
-#else  /* __BYTE_ORDER__ */
+#else /* __BYTE_ORDER__ */
   return memcmp(a->iov_base, b->iov_base, a->iov_len);
 #endif /* __BYTE_ORDER__ */
 #endif /* UNALIGNED_OK */
@@ -6314,7 +6315,7 @@ static int mdbx_page_get(MDBX_cursor *mc, pgno_t pgno, MDBX_page **ret,
 
 mapped:
   p = pgno2page(env, pgno);
-  /* TODO: check p->mp_validator here */
+/* TODO: check p->mp_validator here */
 
 done:
   *ret = p;
@@ -10037,8 +10038,9 @@ int mdbx_put(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *data,
   if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID)))
     return MDBX_EINVAL;
 
-  if (unlikely(flags & ~(MDBX_NOOVERWRITE | MDBX_NODUPDATA | MDBX_RESERVE |
-                         MDBX_APPEND | MDBX_APPENDDUP | MDBX_CURRENT)))
+  if (unlikely(flags &
+               ~(MDBX_NOOVERWRITE | MDBX_NODUPDATA | MDBX_RESERVE |
+                 MDBX_APPEND | MDBX_APPENDDUP | MDBX_CURRENT)))
     return MDBX_EINVAL;
 
   if (unlikely(txn->mt_flags & (MDBX_TXN_RDONLY | MDBX_TXN_BLOCKED)))
@@ -10496,8 +10498,8 @@ int __cold mdbx_env_copy(MDBX_env *env, const char *path, unsigned flags) {
   /* The destination path must exist, but the destination file must not.
    * We don't want the OS to cache the writes, since the source data is
    * already in the OS cache. */
-  int rc =
-      mdbx_openfile(lck_pathname, O_WRONLY | O_CREAT | O_EXCL, 0666, &newfd);
+  int rc = mdbx_openfile(lck_pathname, O_WRONLY | O_CREAT | O_EXCL, 0666,
+                         &newfd, true);
   if (rc == MDBX_SUCCESS) {
     if (env->me_psize >= env->me_os_psize) {
 #ifdef F_NOCACHE /* __APPLE__ */
@@ -10678,9 +10680,9 @@ int __cold mdbx_env_info(MDBX_env *env, MDBX_envinfo *arg, size_t bytes) {
 }
 
 static MDBX_cmp_func *mdbx_default_keycmp(unsigned flags) {
-  return (flags & MDBX_REVERSEKEY)
-             ? mdbx_cmp_memnr
-             : (flags & MDBX_INTEGERKEY) ? mdbx_cmp_int_a2 : mdbx_cmp_memn;
+  return (flags & MDBX_REVERSEKEY) ? mdbx_cmp_memnr : (flags & MDBX_INTEGERKEY)
+                                                          ? mdbx_cmp_int_a2
+                                                          : mdbx_cmp_memn;
 }
 
 static MDBX_cmp_func *mdbx_default_datacmp(unsigned flags) {
@@ -11870,8 +11872,9 @@ int mdbx_replace(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key, MDBX_val *new_data,
   if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID)))
     return MDBX_EINVAL;
 
-  if (unlikely(flags & ~(MDBX_NOOVERWRITE | MDBX_NODUPDATA | MDBX_RESERVE |
-                         MDBX_APPEND | MDBX_APPENDDUP | MDBX_CURRENT)))
+  if (unlikely(flags &
+               ~(MDBX_NOOVERWRITE | MDBX_NODUPDATA | MDBX_RESERVE |
+                 MDBX_APPEND | MDBX_APPENDDUP | MDBX_CURRENT)))
     return MDBX_EINVAL;
 
   if (unlikely(txn->mt_flags & (MDBX_TXN_RDONLY | MDBX_TXN_BLOCKED)))
diff --git a/plugins/Dbx_mdbx/src/libmdbx/src/osal.c b/plugins/Dbx_mdbx/src/libmdbx/src/osal.c
index 76433b716d..1a57d750b3 100644
--- a/plugins/Dbx_mdbx/src/libmdbx/src/osal.c
+++ b/plugins/Dbx_mdbx/src/libmdbx/src/osal.c
@@ -17,7 +17,6 @@
 #include "./bits.h"
 
 #if defined(_WIN32) || defined(_WIN64)
-#include <winternl.h>
 
 static int waitstatus2errcode(DWORD result) {
   switch (result) {
@@ -105,13 +104,31 @@ extern NTSTATUS NTAPI NtFreeVirtualMemory(IN HANDLE ProcessHandle,
                                           IN OUT PSIZE_T RegionSize,
                                           IN ULONG FreeType);
 
+#ifndef WOF_CURRENT_VERSION
+typedef struct _WOF_EXTERNAL_INFO {
+  DWORD Version;
+  DWORD Provider;
+} WOF_EXTERNAL_INFO, *PWOF_EXTERNAL_INFO;
+#endif /* WOF_CURRENT_VERSION */
+
+#ifndef WIM_PROVIDER_CURRENT_VERSION
+#define WIM_PROVIDER_HASH_SIZE 20
+
+typedef struct _WIM_PROVIDER_EXTERNAL_INFO {
+  DWORD Version;
+  DWORD Flags;
+  LARGE_INTEGER DataSourceId;
+  BYTE ResourceHash[WIM_PROVIDER_HASH_SIZE];
+} WIM_PROVIDER_EXTERNAL_INFO, *PWIM_PROVIDER_EXTERNAL_INFO;
+#endif /* WIM_PROVIDER_CURRENT_VERSION */
+
 #ifndef FILE_PROVIDER_CURRENT_VERSION
 typedef struct _FILE_PROVIDER_EXTERNAL_INFO_V1 {
   ULONG Version;
   ULONG Algorithm;
   ULONG Flags;
 } FILE_PROVIDER_EXTERNAL_INFO_V1, *PFILE_PROVIDER_EXTERNAL_INFO_V1;
-#endif
+#endif /* FILE_PROVIDER_CURRENT_VERSION */
 
 #ifndef STATUS_OBJECT_NOT_EXTERNALLY_BACKED
 #define STATUS_OBJECT_NOT_EXTERNALLY_BACKED ((NTSTATUS)0xC000046DL)
@@ -120,14 +137,6 @@ typedef struct _FILE_PROVIDER_EXTERNAL_INFO_V1 {
 #define STATUS_INVALID_DEVICE_REQUEST ((NTSTATUS)0xC0000010L)
 #endif
 
-extern NTSTATUS
-NtFsControlFile(IN HANDLE FileHandle, IN OUT HANDLE Event,
-                IN OUT PVOID /* PIO_APC_ROUTINE */ ApcRoutine,
-                IN OUT PVOID ApcContext, OUT PIO_STATUS_BLOCK IoStatusBlock,
-                IN ULONG FsControlCode, IN OUT PVOID InputBuffer,
-                IN ULONG InputBufferLength, OUT OPTIONAL PVOID OutputBuffer,
-                IN ULONG OutputBufferLength);
-
 #endif /* _WIN32 || _WIN64 */
 
 /*----------------------------------------------------------------------------*/
@@ -400,19 +409,20 @@ int mdbx_fastmutex_release(mdbx_fastmutex_t *fastmutex) {
 /*----------------------------------------------------------------------------*/
 
 int mdbx_openfile(const char *pathname, int flags, mode_t mode,
-                  mdbx_filehandle_t *fd) {
+                  mdbx_filehandle_t *fd, bool exclusive) {
   *fd = INVALID_HANDLE_VALUE;
 #if defined(_WIN32) || defined(_WIN64)
   (void)mode;
 
-  DWORD DesiredAccess;
-  DWORD ShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
+  DWORD DesiredAccess, ShareMode;
   DWORD FlagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
   switch (flags & (O_RDONLY | O_WRONLY | O_RDWR)) {
   default:
     return ERROR_INVALID_PARAMETER;
   case O_RDONLY:
     DesiredAccess = GENERIC_READ;
+    ShareMode =
+        exclusive ? FILE_SHARE_READ : (FILE_SHARE_READ | FILE_SHARE_WRITE);
     break;
   case O_WRONLY: /* assume for MDBX_env_copy() and friends output */
     DesiredAccess = GENERIC_WRITE;
@@ -421,6 +431,7 @@ int mdbx_openfile(const char *pathname, int flags, mode_t mode,
     break;
   case O_RDWR:
     DesiredAccess = GENERIC_READ | GENERIC_WRITE;
+    ShareMode = exclusive ? 0 : (FILE_SHARE_READ | FILE_SHARE_WRITE);
     break;
   }
 
@@ -459,7 +470,7 @@ int mdbx_openfile(const char *pathname, int flags, mode_t mode,
     }
   }
 #else
-
+  (void)exclusive;
 #ifdef O_CLOEXEC
   flags |= O_CLOEXEC;
 #endif
@@ -735,51 +746,118 @@ int mdbx_msync(mdbx_mmap_t *map, size_t offset, size_t length, int async) {
 #endif
 }
 
-int mdbx_mmap(int flags, mdbx_mmap_t *map, size_t size, size_t limit) {
-  assert(size <= limit);
+int mdbx_check4nonlocal(mdbx_filehandle_t handle, int flags) {
 #if defined(_WIN32) || defined(_WIN64)
-  NTSTATUS rc;
-  map->length = 0;
-  map->current = 0;
-  map->section = NULL;
-  map->address = nullptr;
-
-  if (GetFileType(map->fd) != FILE_TYPE_DISK)
+  if (GetFileType(handle) != FILE_TYPE_DISK)
     return ERROR_FILE_OFFLINE;
 
-#if defined(_WIN64) && defined(WOF_CURRENT_VERSION)
-  struct {
-    WOF_EXTERNAL_INFO wof_info;
-    union {
-      WIM_PROVIDER_EXTERNAL_INFO wim_info;
-      FILE_PROVIDER_EXTERNAL_INFO_V1 file_info;
-    };
-    size_t reserved_for_microsoft_madness[42];
-  } GetExternalBacking_OutputBuffer;
-  IO_STATUS_BLOCK StatusBlock;
-  rc = NtFsControlFile(map->fd, NULL, NULL, NULL, &StatusBlock,
-                       FSCTL_GET_EXTERNAL_BACKING, NULL, 0,
-                       &GetExternalBacking_OutputBuffer,
-                       sizeof(GetExternalBacking_OutputBuffer));
-  if (rc != STATUS_OBJECT_NOT_EXTERNALLY_BACKED &&
-      rc != STATUS_INVALID_DEVICE_REQUEST)
-    return NT_SUCCESS(rc) ? ERROR_FILE_OFFLINE : ntstatus2errcode(rc);
-#endif
+  if (mdbx_GetFileInformationByHandleEx) {
+    FILE_REMOTE_PROTOCOL_INFO RemoteProtocolInfo;
+    if (mdbx_GetFileInformationByHandleEx(handle, FileRemoteProtocolInfo,
+                                          &RemoteProtocolInfo,
+                                          sizeof(RemoteProtocolInfo))) {
+
+      if ((RemoteProtocolInfo.Flags & REMOTE_PROTOCOL_INFO_FLAG_OFFLINE) &&
+          !(flags & MDBX_RDONLY))
+        return ERROR_FILE_OFFLINE;
+      if (!(RemoteProtocolInfo.Flags & REMOTE_PROTOCOL_INFO_FLAG_LOOPBACK) &&
+          !(flags & MDBX_EXCLUSIVE))
+        return ERROR_REMOTE_STORAGE_MEDIA_ERROR;
+    }
+  }
 
-  WCHAR PathBuffer[INT16_MAX];
-  typedef BOOL (WINAPI *pfnGetVolumeInformationByHandle)(HANDLE, LPWSTR, DWORD, LPDWORD, LPDWORD, LPDWORD, LPWSTR, DWORD);
-  pfnGetVolumeInformationByHandle pvol = (pfnGetVolumeInformationByHandle)GetProcAddress(GetModuleHandleA("kernel32.dll"), "GetVolumeInformationByHandleW");
-  if (pvol) {
+  if (mdbx_NtFsControlFile) {
+    NTSTATUS rc;
+    struct {
+      WOF_EXTERNAL_INFO wof_info;
+      union {
+        WIM_PROVIDER_EXTERNAL_INFO wim_info;
+        FILE_PROVIDER_EXTERNAL_INFO_V1 file_info;
+      };
+      size_t reserved_for_microsoft_madness[42];
+    } GetExternalBacking_OutputBuffer;
+    IO_STATUS_BLOCK StatusBlock;
+    rc = mdbx_NtFsControlFile(handle, NULL, NULL, NULL, &StatusBlock,
+                              FSCTL_GET_EXTERNAL_BACKING, NULL, 0,
+                              &GetExternalBacking_OutputBuffer,
+                              sizeof(GetExternalBacking_OutputBuffer));
+    if (NT_SUCCESS(rc)) {
+      if (!(flags & MDBX_EXCLUSIVE))
+        return ERROR_REMOTE_STORAGE_MEDIA_ERROR;
+    } else if (rc != STATUS_OBJECT_NOT_EXTERNALLY_BACKED &&
+               rc != STATUS_INVALID_DEVICE_REQUEST)
+      return ntstatus2errcode(rc);
+  }
+
+  if (mdbx_GetVolumeInformationByHandleW && mdbx_GetFinalPathNameByHandleW) {
+    WCHAR PathBuffer[INT16_MAX];
     DWORD VolumeSerialNumber, FileSystemFlags;
-    if (!pvol(map->fd, PathBuffer, INT16_MAX, &VolumeSerialNumber, NULL, &FileSystemFlags, NULL, 0))
+    if (!mdbx_GetVolumeInformationByHandleW(handle, PathBuffer, INT16_MAX,
+                                            &VolumeSerialNumber, NULL,
+                                            &FileSystemFlags, NULL, 0))
       return GetLastError();
-    
+
     if ((flags & MDBX_RDONLY) == 0) {
-      if (FileSystemFlags & (FILE_SEQUENTIAL_WRITE_ONCE | FILE_READ_ONLY_VOLUME |
-                             FILE_VOLUME_IS_COMPRESSED))
-        return ERROR_FILE_OFFLINE;
+      if (FileSystemFlags & (FILE_SEQUENTIAL_WRITE_ONCE |
+                             FILE_READ_ONLY_VOLUME | FILE_VOLUME_IS_COMPRESSED))
+        return ERROR_REMOTE_STORAGE_MEDIA_ERROR;
+    }
+
+    if (!mdbx_GetFinalPathNameByHandleW(handle, PathBuffer, INT16_MAX,
+                                        FILE_NAME_NORMALIZED | VOLUME_NAME_NT))
+      return GetLastError();
+
+    if (_wcsnicmp(PathBuffer, L"\\Device\\Mup\\", 12) == 0) {
+      if (!(flags & MDBX_EXCLUSIVE))
+        return ERROR_REMOTE_STORAGE_MEDIA_ERROR;
+    } else if (mdbx_GetFinalPathNameByHandleW(handle, PathBuffer, INT16_MAX,
+                                              FILE_NAME_NORMALIZED |
+                                                  VOLUME_NAME_DOS)) {
+      UINT DriveType = GetDriveTypeW(PathBuffer);
+      if (DriveType == DRIVE_NO_ROOT_DIR &&
+          wcsncmp(PathBuffer, L"\\\\?\\", 4) == 0 &&
+          wcsncmp(PathBuffer + 5, L":\\", 2) == 0) {
+        PathBuffer[7] = 0;
+        DriveType = GetDriveTypeW(PathBuffer + 4);
+      }
+      switch (DriveType) {
+      case DRIVE_CDROM:
+        if (flags & MDBX_RDONLY)
+          break;
+      // fall through
+      case DRIVE_UNKNOWN:
+      case DRIVE_NO_ROOT_DIR:
+      case DRIVE_REMOTE:
+      default:
+        if (!(flags & MDBX_EXCLUSIVE))
+          return ERROR_REMOTE_STORAGE_MEDIA_ERROR;
+      // fall through
+      case DRIVE_REMOVABLE:
+      case DRIVE_FIXED:
+      case DRIVE_RAMDISK:
+        break;
+      }
     }
   }
+#else
+  (void)handle;
+  /* TODO: check for NFS handle ? */
+  (void)flags;
+#endif
+  return MDBX_SUCCESS;
+}
+
+int mdbx_mmap(int flags, mdbx_mmap_t *map, size_t size, size_t limit) {
+  assert(size <= limit);
+#if defined(_WIN32) || defined(_WIN64)
+  map->length = 0;
+  map->current = 0;
+  map->section = NULL;
+  map->address = nullptr;
+
+  NTSTATUS rc = mdbx_check4nonlocal(map->fd, flags);
+  if (rc != MDBX_SUCCESS)
+    return rc;
 
   rc = mdbx_filesize(map->fd, &map->filesize);
   if (rc != MDBX_SUCCESS)
@@ -796,14 +874,13 @@ int mdbx_mmap(int flags, mdbx_mmap_t *map, size_t size, size_t limit) {
   SectionSize.QuadPart = size;
   rc = NtCreateSection(
       &map->section,
-      /* DesiredAccess */
-          (flags & MDBX_WRITEMAP)
+      /* DesiredAccess */ (flags & MDBX_WRITEMAP)
           ? SECTION_QUERY | SECTION_MAP_READ | SECTION_EXTEND_SIZE |
                 SECTION_MAP_WRITE
           : SECTION_QUERY | SECTION_MAP_READ | SECTION_EXTEND_SIZE,
       /* ObjectAttributes */ NULL, /* MaximumSize (InitialSize) */ &SectionSize,
-      /* SectionPageProtection */
-          (flags & MDBX_RDONLY) ? PAGE_READONLY : PAGE_READWRITE,
+      /* SectionPageProtection */ (flags & MDBX_RDONLY) ? PAGE_READONLY
+                                                        : PAGE_READWRITE,
       /* AllocationAttributes */ SEC_RESERVE, map->fd);
   if (!NT_SUCCESS(rc))
     return ntstatus2errcode(rc);
@@ -816,8 +893,8 @@ int mdbx_mmap(int flags, mdbx_mmap_t *map, size_t size, size_t limit) {
       /* SectionOffset */ NULL, &ViewSize,
       /* InheritDisposition */ ViewUnmap,
       /* AllocationType */ (flags & MDBX_RDONLY) ? 0 : MEM_RESERVE,
-      /* Win32Protect */
-          (flags & MDBX_WRITEMAP) ? PAGE_READWRITE : PAGE_READONLY);
+      /* Win32Protect */ (flags & MDBX_WRITEMAP) ? PAGE_READWRITE
+                                                 : PAGE_READONLY);
   if (!NT_SUCCESS(rc)) {
     NtClose(map->section);
     map->section = 0;
@@ -852,6 +929,11 @@ int mdbx_munmap(mdbx_mmap_t *map) {
   if (!NT_SUCCESS(rc))
     ntstatus2errcode(rc);
 
+  if (map->filesize != map->current &&
+      mdbx_filesize(map->fd, &map->filesize) == MDBX_SUCCESS &&
+      map->filesize != map->current)
+    (void)mdbx_ftruncate(map->fd, map->current);
+
   map->length = 0;
   map->current = 0;
   map->address = nullptr;
@@ -877,11 +959,8 @@ int mdbx_mresize(int flags, mdbx_mmap_t *map, size_t size, size_t limit) {
     /* growth rw-section */
     SectionSize.QuadPart = size;
     status = NtExtendSection(map->section, &SectionSize);
-    if (NT_SUCCESS(status)) {
-      map->current = size;
-      if (map->filesize < size)
-        map->filesize = size;
-    }
+    if (NT_SUCCESS(status))
+      map->filesize = map->current = size;
     return ntstatus2errcode(status);
   }
 
@@ -956,15 +1035,14 @@ retry_file_and_section:
   SectionSize.QuadPart = size;
   status = NtCreateSection(
       &map->section,
-      /* DesiredAccess */
-          (flags & MDBX_WRITEMAP)
+      /* DesiredAccess */ (flags & MDBX_WRITEMAP)
           ? SECTION_QUERY | SECTION_MAP_READ | SECTION_EXTEND_SIZE |
                 SECTION_MAP_WRITE
           : SECTION_QUERY | SECTION_MAP_READ | SECTION_EXTEND_SIZE,
       /* ObjectAttributes */ NULL,
       /* MaximumSize (InitialSize) */ &SectionSize,
-      /* SectionPageProtection */
-          (flags & MDBX_RDONLY) ? PAGE_READONLY : PAGE_READWRITE,
+      /* SectionPageProtection */ (flags & MDBX_RDONLY) ? PAGE_READONLY
+                                                        : PAGE_READWRITE,
       /* AllocationAttributes */ SEC_RESERVE, map->fd);
 
   if (!NT_SUCCESS(status))
@@ -988,8 +1066,8 @@ retry_mapview:;
       /* SectionOffset */ NULL, &ViewSize,
       /* InheritDisposition */ ViewUnmap,
       /* AllocationType */ (flags & MDBX_RDONLY) ? 0 : MEM_RESERVE,
-      /* Win32Protect */
-          (flags & MDBX_WRITEMAP) ? PAGE_READWRITE : PAGE_READONLY);
+      /* Win32Protect */ (flags & MDBX_WRITEMAP) ? PAGE_READWRITE
+                                                 : PAGE_READONLY);
 
   if (!NT_SUCCESS(status)) {
     if (status == /* STATUS_CONFLICTING_ADDRESSES */ 0xC0000018 &&
diff --git a/plugins/Dbx_mdbx/src/libmdbx/src/osal.h b/plugins/Dbx_mdbx/src/libmdbx/src/osal.h
index be3d4980e6..41e53222d7 100644
--- a/plugins/Dbx_mdbx/src/libmdbx/src/osal.h
+++ b/plugins/Dbx_mdbx/src/libmdbx/src/osal.h
@@ -65,9 +65,11 @@
 /* Systems includes */
 
 #if defined(_WIN32) || defined(_WIN64)
+#define WIN32_LEAN_AND_MEAN
 #include <tlhelp32.h>
 #include <windows.h>
 #include <winnt.h>
+#include <winternl.h>
 #define HAVE_SYS_STAT_H
 #define HAVE_SYS_TYPES_H
 typedef HANDLE mdbx_thread_t;
@@ -475,7 +477,7 @@ int mdbx_filesize_sync(mdbx_filehandle_t fd);
 int mdbx_ftruncate(mdbx_filehandle_t fd, uint64_t length);
 int mdbx_filesize(mdbx_filehandle_t fd, uint64_t *length);
 int mdbx_openfile(const char *pathname, int flags, mode_t mode,
-                  mdbx_filehandle_t *fd);
+                  mdbx_filehandle_t *fd, bool exclusive);
 int mdbx_closefile(mdbx_filehandle_t fd);
 
 typedef struct mdbx_mmap_param {
@@ -508,6 +510,7 @@ int mdbx_suspend_threads_before_remap(MDBX_env *env,
 int mdbx_resume_threads_after_remap(mdbx_handle_array_t *array);
 #endif /* Windows */
 int mdbx_msync(mdbx_mmap_t *map, size_t offset, size_t length, int async);
+int mdbx_check4nonlocal(mdbx_filehandle_t handle, int flags);
 
 static __inline mdbx_pid_t mdbx_getpid(void) {
 #if defined(_WIN32) || defined(_WIN64)
@@ -560,21 +563,52 @@ LIBMDBX_API void mdbx_txn_unlock(MDBX_env *env);
 int mdbx_rpid_set(MDBX_env *env);
 int mdbx_rpid_clear(MDBX_env *env);
 
-typedef struct MDBX_shlock {
-	union {
-		struct {
-			__declspec(align(64)) long volatile readerCount;
-			__declspec(align(64)) long volatile writerCount;
-		};
-		RTL_SRWLOCK srwLock;
-	};
-} MDBX_shlock;
-
-void mdbx_shlock_init(MDBX_shlock *lck);
-void mdbx_shlock_acquireShared(MDBX_shlock *lck);
-void mdbx_shlock_releaseShared(MDBX_shlock *lck);
-void mdbx_shlock_acquireExclusive(MDBX_shlock *lck);
-void mdbx_shlock_releaseExclusive(MDBX_shlock *lck);
+#if defined(_WIN32) || defined(_WIN64)
+typedef struct MDBX_srwlock {
+  union {
+    struct {
+      long volatile readerCount;
+      long volatile writerCount;
+    };
+    RTL_SRWLOCK native;
+  };
+} MDBX_srwlock;
+
+typedef void(WINAPI *MDBX_srwlock_function)(MDBX_srwlock *);
+extern MDBX_srwlock_function mdbx_srwlock_Init, mdbx_srwlock_AcquireShared,
+    mdbx_srwlock_ReleaseShared, mdbx_srwlock_AcquireExclusive,
+    mdbx_srwlock_ReleaseExclusive;
+
+typedef BOOL(WINAPI *MDBX_GetFileInformationByHandleEx)(
+    _In_ HANDLE hFile, _In_ FILE_INFO_BY_HANDLE_CLASS FileInformationClass,
+    _Out_ LPVOID lpFileInformation, _In_ DWORD dwBufferSize);
+extern MDBX_GetFileInformationByHandleEx mdbx_GetFileInformationByHandleEx;
+
+typedef BOOL(WINAPI *MDBX_GetVolumeInformationByHandleW)(
+    _In_ HANDLE hFile, _Out_opt_ LPWSTR lpVolumeNameBuffer,
+    _In_ DWORD nVolumeNameSize, _Out_opt_ LPDWORD lpVolumeSerialNumber,
+    _Out_opt_ LPDWORD lpMaximumComponentLength,
+    _Out_opt_ LPDWORD lpFileSystemFlags,
+    _Out_opt_ LPWSTR lpFileSystemNameBuffer, _In_ DWORD nFileSystemNameSize);
+
+extern MDBX_GetVolumeInformationByHandleW mdbx_GetVolumeInformationByHandleW;
+
+typedef DWORD(WINAPI *MDBX_GetFinalPathNameByHandleW)(_In_ HANDLE hFile,
+                                                      _Out_ LPWSTR lpszFilePath,
+                                                      _In_ DWORD cchFilePath,
+                                                      _In_ DWORD dwFlags);
+extern MDBX_GetFinalPathNameByHandleW mdbx_GetFinalPathNameByHandleW;
+
+typedef NTSTATUS(NTAPI *MDBX_NtFsControlFile)(
+    IN HANDLE FileHandle, IN OUT HANDLE Event,
+    IN OUT PVOID /* PIO_APC_ROUTINE */ ApcRoutine, IN OUT PVOID ApcContext,
+    OUT PIO_STATUS_BLOCK IoStatusBlock, IN ULONG FsControlCode,
+    IN OUT PVOID InputBuffer, IN ULONG InputBufferLength,
+    OUT OPTIONAL PVOID OutputBuffer, IN ULONG OutputBufferLength);
+
+extern MDBX_NtFsControlFile mdbx_NtFsControlFile;
+
+#endif /* Windows */
 
 /* Checks reader by pid.
  *