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reactos/ntoskrnl/cache/section/io.c

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/*
* 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/io.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
*/
/* INCLUDES *****************************************************************/
#include <ntoskrnl.h>
#include "newmm.h"
#define NDEBUG
#include <debug.h>
#include <reactos/exeformat.h>
KEVENT CcpLazyWriteEvent;
PDEVICE_OBJECT
NTAPI
MmGetDeviceObjectForFile(IN PFILE_OBJECT FileObject)
{
return IoGetRelatedDeviceObject(FileObject);
}
/*
Note:
This completion function is really required. Paging io completion does almost
nothing, including freeing the mdls.
*/
_Function_class_(IO_COMPLETION_ROUTINE)
NTSTATUS
NTAPI
MiSimpleReadComplete(PDEVICE_OBJECT DeviceObject,
PIRP Irp,
PVOID Context)
{
PMDL Mdl = Irp->MdlAddress;
/* Unlock MDL Pages, page 167. */
DPRINT("MiSimpleReadComplete %p\n", Irp);
while (Mdl)
{
DPRINT("MDL Unlock %p\n", Mdl);
MmUnlockPages(Mdl);
Mdl = Mdl->Next;
}
/* Check if there's an MDL */
while ((Mdl = Irp->MdlAddress))
{
/* Clear all of them */
Irp->MdlAddress = Mdl->Next;
IoFreeMdl(Mdl);
}
return STATUS_SUCCESS;
}
/*
MiSimpleRead is a convenience function that provides either paging or non
paging reads. The caching and mm systems use this in paging mode, where
a completion function is required as above. The Paging BOOLEAN determines
whether the read is issued as a paging read or as an ordinary buffered read.
*/
NTSTATUS
NTAPI
MiSimpleRead(PFILE_OBJECT FileObject,
PLARGE_INTEGER FileOffset,
PVOID Buffer,
ULONG Length,
BOOLEAN Paging,
PIO_STATUS_BLOCK ReadStatus)
{
NTSTATUS Status;
PIRP Irp = NULL;
KEVENT ReadWait;
PDEVICE_OBJECT DeviceObject;
PIO_STACK_LOCATION IrpSp;
ASSERT(FileObject);
ASSERT(FileOffset);
ASSERT(Buffer);
ASSERT(ReadStatus);
DeviceObject = MmGetDeviceObjectForFile(FileObject);
ReadStatus->Status = STATUS_INTERNAL_ERROR;
ReadStatus->Information = 0;
ASSERT(DeviceObject);
DPRINT("PAGING READ: FileObject %p <%wZ> Offset %08x%08x Length %ul\n",
FileObject,
&FileObject->FileName,
FileOffset->HighPart,
FileOffset->LowPart,
Length);
KeInitializeEvent(&ReadWait, NotificationEvent, FALSE);
Irp = IoBuildAsynchronousFsdRequest(IRP_MJ_READ,
DeviceObject,
Buffer,
Length,
FileOffset,
ReadStatus);
if (!Irp)
{
return STATUS_NO_MEMORY;
}
Irp->Flags |= (Paging ? IRP_PAGING_IO | IRP_SYNCHRONOUS_PAGING_IO | IRP_NOCACHE : 0) | IRP_SYNCHRONOUS_API;
Irp->UserEvent = &ReadWait;
Irp->Tail.Overlay.OriginalFileObject = FileObject;
Irp->Tail.Overlay.Thread = PsGetCurrentThread();
IrpSp = IoGetNextIrpStackLocation(Irp);
IrpSp->Control |= SL_INVOKE_ON_SUCCESS | SL_INVOKE_ON_ERROR;
IrpSp->FileObject = FileObject;
IrpSp->CompletionRoutine = MiSimpleReadComplete;
/* Non paging case, the FileObject will be dereferenced at completion */
if (!Paging)
ObReferenceObject(FileObject);
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
DPRINT("KeWaitForSingleObject(&ReadWait)\n");
if (!NT_SUCCESS(KeWaitForSingleObject(&ReadWait,
Suspended,
KernelMode,
FALSE,
NULL)))
{
DPRINT1("Warning: Failed to wait for synchronous IRP\n");
ASSERT(FALSE);
return Status;
}
}
DPRINT("Paging IO Done: %08x\n", ReadStatus->Status);
/* When "ReadStatus->Information > 0" is false and "ReadStatus->Status == STATUS_END_OF_FILE" is true
* it means that read pointer is out of file, so we must fail */
Status = ReadStatus->Status == STATUS_END_OF_FILE && ReadStatus->Information > 0 ? STATUS_SUCCESS : ReadStatus->Status;
return Status;
}
#ifdef NEWCC
/*
Convenience function for writing from kernel space. This issues a paging
write in all cases.
*/
NTSTATUS
NTAPI
_MiSimpleWrite(PFILE_OBJECT FileObject,
PLARGE_INTEGER FileOffset,
PVOID Buffer,
ULONG Length,
PIO_STATUS_BLOCK ReadStatus,
const char *File,
int Line)
{
NTSTATUS Status;
PIRP Irp = NULL;
KEVENT ReadWait;
PDEVICE_OBJECT DeviceObject;
PIO_STACK_LOCATION IrpSp;
ASSERT(FileObject);
ASSERT(FileOffset);
ASSERT(Buffer);
ASSERT(ReadStatus);
DeviceObject = MmGetDeviceObjectForFile(FileObject);
ASSERT(DeviceObject);
DPRINT("PAGING WRITE: FileObject %p <%wZ> Offset 0x%I64x Length %lu (%s:%d)\n",
FileObject,
&FileObject->FileName,
FileOffset->QuadPart,
Length,
File,
Line);
KeInitializeEvent(&ReadWait, NotificationEvent, FALSE);
Irp = IoBuildAsynchronousFsdRequest(IRP_MJ_WRITE,
DeviceObject,
Buffer,
Length,
FileOffset,
ReadStatus);
if (!Irp)
{
return STATUS_NO_MEMORY;
}
Irp->Flags = IRP_PAGING_IO | IRP_SYNCHRONOUS_PAGING_IO | IRP_NOCACHE | IRP_SYNCHRONOUS_API;
Irp->UserEvent = &ReadWait;
Irp->Tail.Overlay.OriginalFileObject = FileObject;
Irp->Tail.Overlay.Thread = PsGetCurrentThread();
IrpSp = IoGetNextIrpStackLocation(Irp);
IrpSp->Control |= SL_INVOKE_ON_SUCCESS | SL_INVOKE_ON_ERROR;
IrpSp->FileObject = FileObject;
IrpSp->CompletionRoutine = MiSimpleReadComplete;
DPRINT("Call Driver\n");
Status = IoCallDriver(DeviceObject, Irp);
DPRINT("Status %x\n", Status);
if (Status == STATUS_PENDING)
{
DPRINT("KeWaitForSingleObject(&ReadWait)\n");
if (!NT_SUCCESS(KeWaitForSingleObject(&ReadWait,
Suspended,
KernelMode,
FALSE,
NULL)))
{
DPRINT1("Warning: Failed to wait for synchronous IRP\n");
ASSERT(FALSE);
return Status;
}
}
DPRINT("Paging IO Done: %08x\n", ReadStatus->Status);
return ReadStatus->Status;
}
extern KEVENT MpwThreadEvent;
FAST_MUTEX MiWriteMutex;
/*
Function which uses MiSimpleWrite to write back a single page to a file.
The page in question does not need to be mapped. This function could be
made a bit more efficient by avoiding the copy and making a system space
mdl.
*/
NTSTATUS
NTAPI
_MiWriteBackPage(PFILE_OBJECT FileObject,
PLARGE_INTEGER FileOffset,
ULONG Length,
PFN_NUMBER Page,
const char *File,
int Line)
{
NTSTATUS Status;
PVOID Hyperspace;
IO_STATUS_BLOCK Iosb;
KIRQL OldIrql;
PVOID PageBuffer = ExAllocatePool(NonPagedPool, PAGE_SIZE);
if (!PageBuffer) return STATUS_NO_MEMORY;
Hyperspace = MiMapPageInHyperSpace(PsGetCurrentProcess(), Page, &OldIrql);
if (!Hyperspace)
{
ExFreePool(PageBuffer);
return STATUS_NO_MEMORY;
}
RtlCopyMemory(PageBuffer, Hyperspace, PAGE_SIZE);
MiUnmapPageInHyperSpace(PsGetCurrentProcess(), Hyperspace, OldIrql);
DPRINT("MiWriteBackPage(%wZ,%08x%08x,%s:%d)\n",
&FileObject->FileName,
FileOffset->u.HighPart,
FileOffset->u.LowPart,
File,
Line);
Status = MiSimpleWrite(FileObject,
FileOffset,
PageBuffer,
Length,
&Iosb);
ExFreePool(PageBuffer);
if (!NT_SUCCESS(Status))
{
DPRINT1("MiSimpleWrite failed (%x)\n", Status);
}
return Status;
}
#endif
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