+++ /dev/null
-/*
- * Copyright (C) 1998-2005 ReactOS Team (and the authors from the programmers section)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- *
- * PROJECT: ReactOS kernel
- * FILE: ntoskrnl/cache/section/reqtools.c
- * PURPOSE: Implements section objects
- *
- * PROGRAMMERS: Rex Jolliff
- * David Welch
- * Eric Kohl
- * Emanuele Aliberti
- * Eugene Ingerman
- * Casper Hornstrup
- * KJK::Hyperion
- * Guido de Jong
- * Ge van Geldorp
- * Royce Mitchell III
- * Filip Navara
- * Aleksey Bragin
- * Jason Filby
- * Thomas Weidenmueller
- * Gunnar Andre' Dalsnes
- * Mike Nordell
- * Alex Ionescu
- * Gregor Anich
- * Steven Edwards
- * Herve Poussineau
- */
-
-/*
- This file contains functions used by fault.c to do blocking resource
- acquisition. To call one of these functions, fill out your
- MM_REQUIRED_RESOURCES with a pointer to the desired function and configure
- the other members as below.
- */
-
-/* INCLUDES *****************************************************************/
-
-#include <ntoskrnl.h>
-#include "newmm.h"
-#define NDEBUG
-#include <debug.h>
-
-#define DPRINTC DPRINT
-
-VOID
-NTAPI
-MmBuildMdlFromPages(PMDL Mdl, PPFN_NUMBER Pages);
-
-/*
-
-Blocking function to acquire zeroed pages from the balancer.
-
-Upon entry:
-
-Required->Amount: Number of pages to acquire
-Required->Consumer: consumer to charge the page to
-
-Upon return:
-
-Required->Pages[0..Amount]: Allocated pages.
-
-The function fails unless all requested pages can be allocated.
-
- */
-NTSTATUS
-NTAPI
-MiGetOnePage(PMMSUPPORT AddressSpace,
- PMEMORY_AREA MemoryArea,
- PMM_REQUIRED_RESOURCES Required)
-{
- ULONG i;
- NTSTATUS Status = STATUS_SUCCESS;
-
- for (i = 0; i < Required->Amount; i++)
- {
- DPRINTC("MiGetOnePage(%s:%d)\n", Required->File, Required->Line);
- Status = MmRequestPageMemoryConsumer(Required->Consumer,
- TRUE,
- &Required->Page[i]);
- if (!NT_SUCCESS(Status))
- {
- while (i > 0)
- {
- MmReleasePageMemoryConsumer(Required->Consumer,
- Required->Page[i-1]);
- i--;
- }
- return Status;
- }
- }
-
- return Status;
-}
-
-/*
-
-Blocking function to read (part of) a page from a file.
-
-Upon entry:
-
-Required->Context: a FILE_OBJECT to read
-Required->Consumer: consumer to charge the page to
-Required->FileOffset: Offset to read at
-Required->Amount: Number of bytes to read (0 -> 4096)
-
-Upon return:
-
-Required->Page[Required->Offset]: The allocated and read in page
-
-The indicated page is filled to Required->Amount with file data and zeroed
-afterward.
-
- */
-
-NTSTATUS
-NTAPI
-MiReadFilePage(PMMSUPPORT AddressSpace,
- PMEMORY_AREA MemoryArea,
- PMM_REQUIRED_RESOURCES RequiredResources)
-{
- PFILE_OBJECT FileObject = RequiredResources->Context;
- PPFN_NUMBER Page = &RequiredResources->Page[RequiredResources->Offset];
- PLARGE_INTEGER FileOffset = &RequiredResources->FileOffset;
- NTSTATUS Status;
- PVOID PageBuf = NULL;
- KEVENT Event;
- IO_STATUS_BLOCK IOSB;
- UCHAR MdlBase[sizeof(MDL) + sizeof(ULONG)];
- PMDL Mdl = (PMDL)MdlBase;
- KIRQL OldIrql;
-
- DPRINTC("Pulling page %I64x from %wZ to %Ix\n",
- FileOffset->QuadPart,
- &FileObject->FileName,
- *Page);
-
- Status = MmRequestPageMemoryConsumer(RequiredResources->Consumer,
- TRUE,
- Page);
-
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("Status: %x\n", Status);
- return Status;
- }
-
- MmInitializeMdl(Mdl, NULL, PAGE_SIZE);
- MmBuildMdlFromPages(Mdl, Page);
- Mdl->MdlFlags |= MDL_PAGES_LOCKED;
-
- KeInitializeEvent(&Event, NotificationEvent, FALSE);
- Status = IoPageRead(FileObject, Mdl, FileOffset, &Event, &IOSB);
- if (Status == STATUS_PENDING)
- {
- KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
- Status = IOSB.Status;
- }
- if (Mdl->MdlFlags & MDL_MAPPED_TO_SYSTEM_VA)
- {
- MmUnmapLockedPages (Mdl->MappedSystemVa, Mdl);
- }
-
- PageBuf = MiMapPageInHyperSpace(PsGetCurrentProcess(), *Page, &OldIrql);
- if (!PageBuf)
- {
- MmReleasePageMemoryConsumer(RequiredResources->Consumer, *Page);
- return STATUS_NO_MEMORY;
- }
-
- RtlZeroMemory((PCHAR)PageBuf+RequiredResources->Amount,
- PAGE_SIZE-RequiredResources->Amount);
-
- MiUnmapPageInHyperSpace(PsGetCurrentProcess(), PageBuf, OldIrql);
-
- DPRINT("Read Status %x (Page %x)\n", Status, *Page);
-
- if (!NT_SUCCESS(Status))
- {
- MmReleasePageMemoryConsumer(RequiredResources->Consumer, *Page);
- DPRINT("Status: %x\n", Status);
- return Status;
- }
-
- return STATUS_SUCCESS;
-}
-
-/*
-
-Blocking function to read a swap page into a memory page.
-
-Upon entry:
-
-Required->Consumer: consumer to charge the page to
-Required->SwapEntry: swap entry to use
-
-Upon return:
-
-Required->Page[Required->Offset]: Populated page
-
-*/
-
-NTSTATUS
-NTAPI
-MiSwapInPage(PMMSUPPORT AddressSpace,
- PMEMORY_AREA MemoryArea,
- PMM_REQUIRED_RESOURCES Resources)
-{
- NTSTATUS Status;
-
- Status = MmRequestPageMemoryConsumer(Resources->Consumer,
- TRUE,
- &Resources->Page[Resources->Offset]);
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("MmRequestPageMemoryConsumer failed, status = %x\n", Status);
- return Status;
- }
-
- Status = MmReadFromSwapPage(Resources->SwapEntry,
- Resources->Page[Resources->Offset]);
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("MmReadFromSwapPage failed, status = %x\n", Status);
- return Status;
- }
-
- MmSetSavedSwapEntryPage(Resources->Page[Resources->Offset],
- Resources->SwapEntry);
-
- DPRINT1("MiSwapInPage(%x,%x)\n",
- Resources->Page[Resources->Offset],
- Resources->SwapEntry);
-
- return Status;
-}
-
-/*
-
-A way to write a page without a lock acquired using the same blocking mechanism
-as resource acquisition.
-
-Upon entry:
-
-Required->Page[Required->Offset]: Page to write
-Required->Context: FILE_OBJECT to write to
-Required->FileOffset: offset to write at
-
-This always does a paging write with whole page size. Note that paging IO
-doesn't change the valid data length of a file.
-
-*/
-
-NTSTATUS
-NTAPI
-MiWriteFilePage(PMMSUPPORT AddressSpace,
- PMEMORY_AREA MemoryArea,
- PMM_REQUIRED_RESOURCES Required)
-{
- DPRINT1("MiWriteFilePage(%x,%x)\n",
- Required->Page[Required->Offset],
- Required->FileOffset.LowPart);
-
- return MiWriteBackPage(Required->Context,
- &Required->FileOffset,
- PAGE_SIZE,
- Required->Page[Required->Offset]);
-}
projects / reactos.git / blobdiff