ntoskrnl/mm/pagefile.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * PROJECT:         ReactOS kernel
  22  * FILE:            ntoskrnl/mm/pagefile.c
  23  * PURPOSE:         Paging file functions
  24  * PROGRAMMER:      David Welch (welch@mcmail.com)
  25  * UPDATE HISTORY:
  26  *                  Created 22/05/98
  27  */
  28
  29 /* INCLUDES *****************************************************************/
  30
  31 #include <ddk/ntddk.h>
  32 #include <internal/io.h>
  33 #include <internal/mm.h>
  34 #include <napi/core.h>
  35 #include <internal/ps.h>
  36
  37 #define NDEBUG
  38 #include <internal/debug.h>
  39
  40 /* TYPES *********************************************************************/
  41
  42 typedef struct _PAGINGFILE
  43 {
  44    LIST_ENTRY PagingFileListEntry;
  45    PFILE_OBJECT FileObject;
  46    LARGE_INTEGER MaximumSize;
  47    LARGE_INTEGER CurrentSize;
  48    ULONG FreePages;
  49    ULONG UsedPages;
  50    PULONG AllocMap;
  51    KSPIN_LOCK AllocMapLock;
  52    ULONG AllocMapSize;
  53 } PAGINGFILE, *PPAGINGFILE;
  54
  55 /* GLOBALS *******************************************************************/
  56
  57 #define MAX_PAGING_FILES  (32)
  58
  59 /* List of paging files, both used and free */
  60 static PPAGINGFILE PagingFileList[MAX_PAGING_FILES];
  61
  62 /* Lock for examining the list of paging files */
  63 static KSPIN_LOCK PagingFileListLock;
  64
  65 /* Number of paging files */
  66 static ULONG MiPagingFileCount;
  67
  68 /* Number of pages that are available for swapping */
  69 static ULONG MiFreeSwapPages;
  70
  71 /* Number of pages that have been allocated for swapping */
  72 static ULONG MiUsedSwapPages;
  73
  74 /*
  75  * Number of pages that have been reserved for swapping but not yet allocated
  76  */
  77 static ULONG MiReservedSwapPages;
  78
  79 /*
  80  * Ratio between reserved and available swap pages, e.g. setting this to five
  81  * forces one swap page to be available for every five swap pages that are
  82  * reserved. Setting this to zero turns off commit checking altogether.
  83  */
  84 #define MM_PAGEFILE_COMMIT_RATIO      (1)
  85
  86 /*
  87  * Number of pages that can be used for potentially swapable memory without
  88  * pagefile space being reserved. The intention is that this allows smss
  89  * to start up and create page files while ordinarily having a commit
  90  * ratio of one.
  91  */
  92 #define MM_PAGEFILE_COMMIT_GRACE      (256)
  93
  94 static PVOID MmCoreDumpPageFrame;
  95 static PULONG MmCoreDumpBlockMap;
  96 static ULONG MmCoreDumpSize;
  97 static PULONG MmCoreDumpBlockMap = NULL;
  98 static MM_DUMP_POINTERS MmCoreDumpDeviceFuncs;
  99 ULONG MmCoreDumpType;
 100
 101 /*
 102  * Translate between a swap entry and a file and offset pair.
 103  */
 104 #define FILE_FROM_ENTRY(i) ((i) >> 24)
 105 #define OFFSET_FROM_ENTRY(i) (((i) & 0xffffff) - 1)
 106 #define ENTRY_FROM_FILE_OFFSET(i, j) (((i) << 24) | ((j) + 1))
 107
 108 static BOOLEAN MmSwapSpaceMessage = FALSE;
 109
 110 /* FUNCTIONS *****************************************************************/
 111
 112 VOID
 113 MmShowOutOfSpaceMessagePagingFile(VOID)
 114 {
 115   if (!MmSwapSpaceMessage)
 116     {
 117       DPRINT1("MM: Out of swap space.\n");
 118       MmSwapSpaceMessage = TRUE;
 119     }
 120 }
 121
 122 NTSTATUS MmWriteToSwapPage(SWAPENTRY SwapEntry, PMDL Mdl)
 123 {
 124    ULONG i, offset;
 125    LARGE_INTEGER file_offset;
 126    IO_STATUS_BLOCK Iosb;
 127    NTSTATUS Status;
 128    KEVENT Event;
 129
 130    if (SwapEntry == 0)
 131      {
 132         KeBugCheck(0);
 133         return(STATUS_UNSUCCESSFUL);
 134      }
 135
 136    i = FILE_FROM_ENTRY(SwapEntry);
 137    offset = OFFSET_FROM_ENTRY(SwapEntry);
 138
 139    if (i > MAX_PAGING_FILES)
 140      {
 141        DPRINT1("Bad swap entry 0x%.8X\n", SwapEntry);
 142        KeBugCheck(0);
 143      }
 144    if (PagingFileList[i]->FileObject == NULL ||
 145        PagingFileList[i]->FileObject->DeviceObject == NULL)
 146      {
 147        DPRINT1("Bad paging file 0x%.8X\n", SwapEntry);
 148        KeBugCheck(0);
 149      }
 150
 151    file_offset.QuadPart = offset * 4096;
 152    KeInitializeEvent(&Event, NotificationEvent, FALSE);
 153    Status = IoPageWrite(PagingFileList[i]->FileObject,
 154                         Mdl,
 155                         &file_offset,
 156                         &Event,
 157                         &Iosb);
 158    if (Status == STATUS_PENDING)
 159    {
 160       KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
 161       return(Iosb.Status);
 162    }
 163    return(Status);
 164 }
 165
 166 NTSTATUS MmReadFromSwapPage(SWAPENTRY SwapEntry, PMDL Mdl)
 167 {
 168    ULONG i, offset;
 169    LARGE_INTEGER file_offset;
 170    IO_STATUS_BLOCK Iosb;
 171    NTSTATUS Status;
 172    KEVENT Event;
 173
 174    if (SwapEntry == 0)
 175      {
 176         KeBugCheck(0);
 177         return(STATUS_UNSUCCESSFUL);
 178      }
 179
 180    i = FILE_FROM_ENTRY(SwapEntry);
 181    offset = OFFSET_FROM_ENTRY(SwapEntry);
 182
 183    if (i > MAX_PAGING_FILES)
 184      {
 185        DPRINT1("Bad swap entry 0x%.8X\n", SwapEntry);
 186        KeBugCheck(0);
 187      }
 188    if (PagingFileList[i]->FileObject == NULL ||
 189        PagingFileList[i]->FileObject->DeviceObject == NULL)
 190      {
 191        DPRINT1("Bad paging file 0x%.8X\n", SwapEntry);
 192        KeBugCheck(0);
 193      }
 194
 195    file_offset.QuadPart = offset * 4096;
 196    KeInitializeEvent(&Event, NotificationEvent, FALSE);
 197    Status = IoPageRead(PagingFileList[i]->FileObject,
 198                        Mdl,
 199                        &file_offset,
 200                        &Event,
 201                        &Iosb);
 202    if (Status == STATUS_PENDING)
 203    {
 204       KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
 205       return(Iosb.Status);
 206    }
 207    return(Status);
 208 }
 209
 210 VOID
 211 MmInitPagingFile(VOID)
 212 {
 213    ULONG i;
 214
 215    KeInitializeSpinLock(&PagingFileListLock);
 216
 217    MiFreeSwapPages = 0;
 218    MiUsedSwapPages = 0;
 219    MiReservedSwapPages = 0;
 220
 221    for (i = 0; i < MAX_PAGING_FILES; i++)
 222      {
 223         PagingFileList[i] = NULL;
 224      }
 225    MiPagingFileCount = 0;
 226
 227    /*
 228     * Initialize the crash dump support.
 229     */
 230    MmCoreDumpPageFrame = MmAllocateSection(PAGE_SIZE);
 231    if (MmCoreDumpType == MM_CORE_DUMP_TYPE_FULL)
 232      {
 233        MmCoreDumpSize = MmStats.NrTotalPages * 4096 + 1024 * 1024;
 234      }
 235    else
 236      {
 237        MmCoreDumpSize = 1024 * 1024;
 238      }
 239 }
 240
 241 BOOLEAN
 242 MmReserveSwapPages(ULONG Nr)
 243 {
 244    KIRQL oldIrql;
 245    ULONG MiAvailSwapPages;
 246
 247    KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
 248    MiAvailSwapPages =
 249      (MiFreeSwapPages * MM_PAGEFILE_COMMIT_RATIO) + MM_PAGEFILE_COMMIT_GRACE;
 250    MiReservedSwapPages = MiReservedSwapPages + Nr;
 251    if (MM_PAGEFILE_COMMIT_RATIO != 0 && MiAvailSwapPages < MiReservedSwapPages)
 252      {
 253        KeReleaseSpinLock(&PagingFileListLock, oldIrql);
 254        return(FALSE);
 255      }
 256    KeReleaseSpinLock(&PagingFileListLock, oldIrql);
 257    return(TRUE);
 258 }
 259
 260 VOID
 261 MmDereserveSwapPages(ULONG Nr)
 262 {
 263    KIRQL oldIrql;
 264
 265    KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
 266    MiReservedSwapPages = MiReservedSwapPages - Nr;
 267    KeReleaseSpinLock(&PagingFileListLock, oldIrql);
 268 }
 269
 270 static ULONG
 271 MiAllocPageFromPagingFile(PPAGINGFILE PagingFile)
 272 {
 273    KIRQL oldIrql;
 274    ULONG i, j;
 275
 276    KeAcquireSpinLock(&PagingFile->AllocMapLock, &oldIrql);
 277
 278    for (i = 0; i < PagingFile->AllocMapSize; i++)
 279      {
 280        for (j = 0; j < 32; j++)
 281          {
 282            if (!(PagingFile->AllocMap[i] & (1 << j)))
 283              {
 284                break;
 285              }
 286          }
 287        if (j == 32)
 288          {
 289            continue;
 290          }
 291        PagingFile->AllocMap[i] |= (1 << j);
 292        PagingFile->UsedPages++;
 293        PagingFile->FreePages--;
 294        KeReleaseSpinLock(&PagingFile->AllocMapLock, oldIrql);
 295        return((i * 32) + j);
 296      }
 297
 298    KeReleaseSpinLock(&PagingFile->AllocMapLock, oldIrql);
 299    return(0xFFFFFFFF);
 300 }
 301
 302 VOID
 303 MmFreeSwapPage(SWAPENTRY Entry)
 304 {
 305    ULONG i;
 306    ULONG off;
 307    KIRQL oldIrql;
 308
 309    i = FILE_FROM_ENTRY(Entry);
 310    off = OFFSET_FROM_ENTRY(Entry);
 311
 312    KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
 313    if (PagingFileList[i] == NULL)
 314      {
 315        KeBugCheck(0);
 316      }
 317    KeAcquireSpinLockAtDpcLevel(&PagingFileList[i]->AllocMapLock);
 318
 319    PagingFileList[i]->AllocMap[off / 32] &= (~(1 << (off % 32)));
 320
 321    PagingFileList[i]->FreePages++;
 322    PagingFileList[i]->UsedPages--;
 323
 324    MiFreeSwapPages++;
 325    MiUsedSwapPages--;
 326
 327    KeReleaseSpinLockFromDpcLevel(&PagingFileList[i]->AllocMapLock);
 328    KeReleaseSpinLock(&PagingFileListLock, oldIrql);
 329 }
 330
 331 BOOLEAN
 332 MmIsAvailableSwapPage(VOID)
 333 {
 334   return(MiFreeSwapPages > 0);
 335 }
 336
 337 SWAPENTRY
 338 MmAllocSwapPage(VOID)
 339 {
 340    KIRQL oldIrql;
 341    ULONG i;
 342    ULONG off;
 343    SWAPENTRY entry;
 344
 345    KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
 346
 347    if (MiFreeSwapPages == 0)
 348      {
 349         KeReleaseSpinLock(&PagingFileListLock, oldIrql);
 350         return(0);
 351      }
 352
 353    for (i = 0; i < MAX_PAGING_FILES; i++)
 354      {
 355         if (PagingFileList[i] != NULL &&
 356             PagingFileList[i]->FreePages >= 1)
 357           {
 358              off = MiAllocPageFromPagingFile(PagingFileList[i]);
 359              if (off == 0xFFFFFFFF)
 360                {
 361                   KeBugCheck(0);
 362                   KeReleaseSpinLock(&PagingFileListLock, oldIrql);
 363                   return(STATUS_UNSUCCESSFUL);
 364                }
 365              MiUsedSwapPages++;
 366              MiFreeSwapPages--;
 367              KeReleaseSpinLock(&PagingFileListLock, oldIrql);
 368
 369              entry = ENTRY_FROM_FILE_OFFSET(i, off);
 370              return(entry);
 371           }
 372      }
 373
 374    KeReleaseSpinLock(&PagingFileListLock, oldIrql);
 375    KeBugCheck(0);
 376    return(0);
 377 }
 378
 379 NTSTATUS STDCALL
 380 MmDumpToPagingFile(ULONG BugCode,
 381                    ULONG BugCodeParameter1,
 382                    ULONG BugCodeParameter2,
 383                    ULONG BugCodeParameter3,
 384                    ULONG BugCodeParameter4,
 385                    PKTRAP_FRAME TrapFrame)
 386 {
 387   PMM_CORE_DUMP_HEADER Headers;
 388   PVOID Context;
 389   NTSTATUS Status;
 390   UCHAR MdlBase[sizeof(MDL) + sizeof(PVOID)];
 391   PMDL Mdl = (PMDL)MdlBase;
 392   PETHREAD Thread = PsGetCurrentThread();
 393   ULONG StackSize;
 394   PULONG MdlMap;
 395   ULONG NextOffset = 0;
 396   ULONG i;
 397
 398   if (MmCoreDumpBlockMap == NULL)
 399     {
 400       return(STATUS_UNSUCCESSFUL);
 401     }
 402
 403   DbgPrint("MM: Dumping core");
 404
 405   /* Prepare the dump headers. */
 406   Headers = (PMM_CORE_DUMP_HEADER)MmCoreDumpPageFrame;
 407   Headers->Magic = MM_CORE_DUMP_HEADER_MAGIC;
 408   Headers->Version = MM_CORE_DUMP_HEADER_VERSION;
 409   Headers->Type = MmCoreDumpType;
 410   if (TrapFrame != NULL)
 411     {
 412       if (!(TrapFrame->Eflags & (1 << 17)))
 413         {
 414           memcpy(&Headers->TrapFrame, TrapFrame,
 415                  sizeof(KTRAP_FRAME) - (4 * sizeof(DWORD)));
 416         }
 417       else
 418         {
 419           memcpy(&Headers->TrapFrame, TrapFrame, sizeof(KTRAP_FRAME));
 420         }
 421     }
 422   Headers->BugCheckCode = BugCode;
 423   Headers->BugCheckParameters[0] = BugCodeParameter1;
 424   Headers->BugCheckParameters[1] = BugCodeParameter2;
 425   Headers->BugCheckParameters[2] = BugCodeParameter3;
 426   Headers->BugCheckParameters[3] = BugCodeParameter4;
 427   Headers->FaultingStackBase = (PVOID)Thread->Tcb.StackLimit;
 428   Headers->FaultingStackSize = StackSize =
 429     (ULONG)(Thread->Tcb.StackBase - Thread->Tcb.StackLimit);
 430   Headers->PhysicalMemorySize = MmStats.NrTotalPages * PAGE_SIZE;
 431
 432   /* Initialize the dump device. */
 433   Context = MmCoreDumpDeviceFuncs.Context;
 434   Status = MmCoreDumpDeviceFuncs.DeviceInit(Context);
 435   if (!NT_SUCCESS(Status))
 436     {
 437       DPRINT1("MM: Failed to initialize core dump device.\n");
 438       return(Status);
 439     }
 440
 441   /* Initialize the MDL. */
 442   Mdl->Next = NULL;
 443   Mdl->Size = sizeof(MDL) + sizeof(PVOID);
 444   Mdl->MdlFlags = MDL_SOURCE_IS_NONPAGED_POOL;
 445   Mdl->Process = NULL;
 446   Mdl->MappedSystemVa = MmCoreDumpPageFrame;
 447   Mdl->StartVa = NULL;
 448   Mdl->ByteCount = PAGE_SIZE;
 449   Mdl->ByteOffset = 0;
 450   MdlMap = (PULONG)(Mdl + 1);
 451
 452   /* Dump the header. */
 453   MdlMap[0] = MmGetPhysicalAddress(MmCoreDumpPageFrame).u.LowPart;
 454   Status = MmCoreDumpDeviceFuncs.DeviceWrite(Context,
 455                                              MmCoreDumpBlockMap[NextOffset],
 456                                              Mdl);
 457   if (!NT_SUCCESS(Status))
 458     {
 459       DPRINT1("MM: Failed to write core dump header\n.");
 460     }
 461   NextOffset++;
 462   DbgPrint(".");
 463
 464   /* Write out the kernel mode stack of the faulting thread. */
 465   for (i = 0; i < (StackSize / PAGE_SIZE); i++)
 466     {
 467       Mdl->MappedSystemVa = (PVOID)(Thread->Tcb.StackLimit + (i * PAGE_SIZE));
 468       MdlMap[0] = MmGetPhysicalAddress(Mdl->MappedSystemVa).u.LowPart;
 469       Status =
 470         MmCoreDumpDeviceFuncs.DeviceWrite(Context,
 471                                           MmCoreDumpBlockMap[NextOffset],
 472                                           Mdl);
 473       if (!NT_SUCCESS(Status))
 474         {
 475           DPRINT1("MM: Failed to write page to core dump.\n");
 476           return(Status);
 477         }
 478       DbgPrint(".");
 479       NextOffset++;
 480     }
 481
 482   /* Write out the contents of physical memory. */
 483   if (MmCoreDumpType == MM_CORE_DUMP_TYPE_FULL)
 484     {
 485       for (i = 0; i < MmStats.NrTotalPages; i++)
 486         {
 487           LARGE_INTEGER PhysicalAddress;
 488           PhysicalAddress.QuadPart = i * PAGE_SIZE;
 489           MdlMap[0] = i * PAGE_SIZE;
 490           MmCreateVirtualMappingForKernel(MmCoreDumpPageFrame,
 491                                           PAGE_READWRITE,
 492                                           PhysicalAddress);
 493           Status =
 494             MmCoreDumpDeviceFuncs.DeviceWrite(Context,
 495                                               MmCoreDumpBlockMap[NextOffset],
 496                                               Mdl);
 497           if (!NT_SUCCESS(Status))
 498             {
 499               DPRINT1("MM: Failed to write page to core dump.\n");
 500               return(Status);
 501             }
 502           DbgPrint(".");
 503           NextOffset++;
 504         }
 505     }
 506
 507   DbgPrint("\n");
 508   return(STATUS_SUCCESS);
 509 }
 510
 511 NTSTATUS STDCALL
 512 NtCreatePagingFile(IN PUNICODE_STRING FileName,
 513                    IN PLARGE_INTEGER InitialSize,
 514                    IN PLARGE_INTEGER MaximumSize,
 515                    IN ULONG Reserved)
 516 {
 517    NTSTATUS Status;
 518    OBJECT_ATTRIBUTES ObjectAttributes;
 519    HANDLE FileHandle;
 520    IO_STATUS_BLOCK IoStatus;
 521    PFILE_OBJECT FileObject;
 522    PPAGINGFILE PagingFile;
 523    KIRQL oldIrql;
 524    ULONG AllocMapSize;
 525    ULONG i;
 526
 527    DPRINT("NtCreatePagingFile(FileName %wZ, InitialSize %I64d)\n",
 528           FileName, InitialSize->QuadPart);
 529
 530    if (MiPagingFileCount >= MAX_PAGING_FILES)
 531      {
 532        return(STATUS_TOO_MANY_PAGING_FILES);
 533      }
 534
 535    InitializeObjectAttributes(&ObjectAttributes,
 536                               FileName,
 537                               0,
 538                               NULL,
 539                               NULL);
 540
 541    Status = IoCreateFile(&FileHandle,
 542                          FILE_ALL_ACCESS,
 543                          &ObjectAttributes,
 544                          &IoStatus,
 545                          NULL,
 546                          0,
 547                          0,
 548                          FILE_OPEN_IF,
 549                          FILE_SYNCHRONOUS_IO_NONALERT,
 550                          NULL,
 551                          0,
 552                          CreateFileTypeNone,
 553                          NULL,
 554                          SL_OPEN_PAGING_FILE);
 555    if (!NT_SUCCESS(Status))
 556      {
 557         return(Status);
 558      }
 559
 560    Status = NtSetInformationFile(FileHandle,
 561                                  &IoStatus,
 562                                  InitialSize,
 563                                  sizeof(LARGE_INTEGER),
 564                                  FileAllocationInformation);
 565    if (!NT_SUCCESS(Status))
 566      {
 567        ZwClose(FileHandle);
 568        return(Status);
 569      }
 570
 571    Status = ObReferenceObjectByHandle(FileHandle,
 572                                       FILE_ALL_ACCESS,
 573                                       IoFileObjectType,
 574                                       UserMode,
 575                                       (PVOID*)&FileObject,
 576                                       NULL);
 577    if (!NT_SUCCESS(Status))
 578      {
 579         NtClose(FileHandle);
 580         return(Status);
 581      }
 582
 583    PagingFile = ExAllocatePool(NonPagedPool, sizeof(*PagingFile));
 584    if (PagingFile == NULL)
 585      {
 586         ObDereferenceObject(FileObject);
 587         NtClose(FileHandle);
 588         return(STATUS_NO_MEMORY);
 589      }
 590
 591    PagingFile->FileObject = FileObject;
 592    PagingFile->MaximumSize.QuadPart = MaximumSize->QuadPart;
 593    PagingFile->CurrentSize.QuadPart = InitialSize->QuadPart;
 594    PagingFile->FreePages = InitialSize->QuadPart / PAGE_SIZE;
 595    PagingFile->UsedPages = 0;
 596    KeInitializeSpinLock(&PagingFile->AllocMapLock);
 597
 598    AllocMapSize = (PagingFile->FreePages / 32) + 1;
 599    PagingFile->AllocMap = ExAllocatePool(NonPagedPool,
 600                                          AllocMapSize * sizeof(ULONG));
 601    PagingFile->AllocMapSize = AllocMapSize;
 602
 603    if (PagingFile->AllocMap == NULL)
 604      {
 605        ExFreePool(PagingFile);
 606        ObDereferenceObject(FileObject);
 607        NtClose(FileHandle);
 608        return(STATUS_NO_MEMORY);
 609      }
 610
 611    KeAcquireSpinLock(&PagingFileListLock, &oldIrql);
 612    for (i = 0; i < MAX_PAGING_FILES; i++)
 613      {
 614         if (PagingFileList[i] == NULL)
 615           {
 616              PagingFileList[i] = PagingFile;
 617              break;
 618           }
 619      }
 620    MiFreeSwapPages = MiFreeSwapPages + PagingFile->FreePages;
 621    MiPagingFileCount++;
 622    KeReleaseSpinLock(&PagingFileListLock, oldIrql);
 623
 624    /* Check whether this pagefile can be a crash dump target. */
 625    if (PagingFile->CurrentSize.QuadPart >= MmCoreDumpSize &&
 626        MmCoreDumpBlockMap != NULL)
 627      {
 628        MmCoreDumpBlockMap =
 629          ExAllocatePool(NonPagedPool,
 630                         (MmCoreDumpSize / PAGE_SIZE) * sizeof(ULONG));
 631        if (MmCoreDumpBlockMap == NULL)
 632          {
 633            DPRINT1("Failed to allocate block map.\n");
 634            NtClose(FileHandle);
 635            return(STATUS_SUCCESS);
 636          }
 637        Status = ZwFsControlFile(FileHandle,
 638                                 NULL,
 639                                 NULL,
 640                                 NULL,
 641                                 &IoStatus,
 642                                 FSCTL_GET_DUMP_BLOCK_MAP,
 643                                 &MmCoreDumpSize,
 644                                 sizeof(ULONG),
 645                                 MmCoreDumpBlockMap,
 646                                 (MmCoreDumpSize / PAGE_SIZE) * sizeof(ULONG));
 647        if (!NT_SUCCESS(Status))
 648          {
 649            DPRINT1("Failed to get dump block map (Status %X)\n", Status);
 650            NtClose(FileHandle);
 651            ExFreePool(MmCoreDumpBlockMap);
 652            MmCoreDumpBlockMap = NULL;
 653            return(STATUS_SUCCESS);
 654          }
 655        Status = ZwDeviceIoControlFile(FileHandle,
 656                                       NULL,
 657                                       NULL,
 658                                       NULL,
 659                                       &IoStatus,
 660                                       IOCTL_GET_DUMP_POINTERS,
 661                                       NULL,
 662                                       0,
 663                                       &MmCoreDumpDeviceFuncs,
 664                                       sizeof(MmCoreDumpDeviceFuncs));
 665        if (!NT_SUCCESS(Status))
 666          {
 667            DPRINT1("Failed to get dump block map (Status %X)\n", Status);
 668            NtClose(FileHandle);
 669            ExFreePool(MmCoreDumpBlockMap);
 670            MmCoreDumpBlockMap = NULL;
 671            return(STATUS_SUCCESS);
 672          }
 673      }
 674    NtClose(FileHandle);
 675
 676    MmSwapSpaceMessage = FALSE;
 677
 678    return(STATUS_SUCCESS);
 679 }
 680
 681
 682 /* EOF */
 683
 684
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 689