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NT4/private/ntos/cntfs/write.c
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/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
Write.c
Abstract:
This module implements the File Write routine for Ntfs called by the
dispatch driver.
Author:
Brian Andrew BrianAn 19-Aug-1991
Revision History:
--*/
#include "NtfsProc.h"
//
// The local debug trace level
//
#define Dbg (DEBUG_TRACE_WRITE)
//
// Define a tag for general pool allocations from this module
//
#undef MODULE_POOL_TAG
#define MODULE_POOL_TAG ('WFtN')
#define OVERFLOW_WRITE_THRESHHOLD (0x1a00)
#define CollectWriteStats(VCB,OPEN_TYPE,SCB,FCB,BYTE_COUNT,IRP_CONTEXT,TLIC) { \
PFILESYSTEM_STATISTICS FsStats = &(VCB)->Statistics[KeGetCurrentProcessorNumber()]; \
if (!FlagOn( (FCB)->FcbState, FCB_STATE_SYSTEM_FILE )) { \
if (NtfsIsTypeCodeUserData( (SCB)->AttributeTypeCode )) { \
FsStats->UserFileWrites += 1; \
FsStats->UserFileWriteBytes += (ULONG)(BYTE_COUNT); \
} else { \
FsStats->Ntfs.UserIndexWrites += 1; \
FsStats->Ntfs.UserIndexWriteBytes += (ULONG)(BYTE_COUNT); \
} \
} else { \
if ((SCB) != (VCB)->LogFileScb) { \
FsStats->MetaDataWrites += 1; \
FsStats->MetaDataWriteBytes += (ULONG)(BYTE_COUNT); \
} \
\
if ((SCB) == (VCB)->MftScb) { \
FsStats->Ntfs.MftWrites += 1; \
FsStats->Ntfs.MftWriteBytes += (ULONG)(BYTE_COUNT); \
\
if ((IRP_CONTEXT) == (TLIC)) { \
FsStats->Ntfs.MftWritesLazyWriter += 1; \
} else if ((TLIC)->LastRestartArea.QuadPart != 0) { \
FsStats->Ntfs.MftWritesFlushForLogFileFull += 1; \
} else { \
FsStats->Ntfs.MftWritesUserRequest += 1; \
\
switch ((TLIC)->MajorFunction) { \
case IRP_MJ_WRITE: \
FsStats->Ntfs.MftWritesUserLevel.Write += 1; \
break; \
case IRP_MJ_CREATE: \
FsStats->Ntfs.MftWritesUserLevel.Create += 1; \
break; \
case IRP_MJ_SET_INFORMATION: \
FsStats->Ntfs.MftWritesUserLevel.SetInfo += 1; \
break; \
case IRP_MJ_FLUSH_BUFFERS: \
FsStats->Ntfs.MftWritesUserLevel.Flush += 1; \
break; \
default: \
break; \
} \
} \
} else if ((SCB) == (VCB)->Mft2Scb) { \
FsStats->Ntfs.Mft2Writes += 1; \
FsStats->Ntfs.Mft2WriteBytes += (ULONG)(BYTE_COUNT); \
\
if ((IRP_CONTEXT) == (TLIC)) { \
FsStats->Ntfs.Mft2WritesLazyWriter += 1; \
} else if ((TLIC)->LastRestartArea.QuadPart != 0) { \
FsStats->Ntfs.Mft2WritesFlushForLogFileFull += 1; \
} else { \
FsStats->Ntfs.Mft2WritesUserRequest += 1; \
\
switch ((TLIC)->MajorFunction) { \
case IRP_MJ_WRITE: \
FsStats->Ntfs.Mft2WritesUserLevel.Write += 1; \
break; \
case IRP_MJ_CREATE: \
FsStats->Ntfs.Mft2WritesUserLevel.Create += 1; \
break; \
case IRP_MJ_SET_INFORMATION: \
FsStats->Ntfs.Mft2WritesUserLevel.SetInfo += 1; \
break; \
case IRP_MJ_FLUSH_BUFFERS: \
FsStats->Ntfs.Mft2WritesUserLevel.Flush += 1; \
break; \
default: \
break; \
} \
} \
} else if ((SCB) == (VCB)->RootIndexScb) { \
FsStats->Ntfs.RootIndexWrites += 1; \
FsStats->Ntfs.RootIndexWriteBytes += (ULONG)(BYTE_COUNT); \
} else if ((SCB) == (VCB)->BitmapScb) { \
FsStats->Ntfs.BitmapWrites += 1; \
FsStats->Ntfs.BitmapWriteBytes += (ULONG)(BYTE_COUNT); \
\
if ((IRP_CONTEXT) == (TLIC)) { \
FsStats->Ntfs.BitmapWritesLazyWriter += 1; \
} else if ((TLIC)->LastRestartArea.QuadPart != 0) { \
FsStats->Ntfs.BitmapWritesFlushForLogFileFull += 1; \
} else { \
FsStats->Ntfs.BitmapWritesUserRequest += 1; \
\
switch ((TLIC)->MajorFunction) { \
case IRP_MJ_WRITE: \
FsStats->Ntfs.BitmapWritesUserLevel.Write += 1; \
break; \
case IRP_MJ_CREATE: \
FsStats->Ntfs.BitmapWritesUserLevel.Create += 1; \
break; \
case IRP_MJ_SET_INFORMATION: \
FsStats->Ntfs.BitmapWritesUserLevel.SetInfo += 1; \
break; \
default: \
break; \
} \
} \
} else if ((SCB) == (VCB)->MftBitmapScb) { \
FsStats->Ntfs.MftBitmapWrites += 1; \
FsStats->Ntfs.MftBitmapWriteBytes += (ULONG)(BYTE_COUNT); \
\
if ((IRP_CONTEXT) == (TLIC)) { \
FsStats->Ntfs.MftBitmapWritesLazyWriter += 1; \
} else if ((TLIC)->LastRestartArea.QuadPart != 0) { \
FsStats->Ntfs.MftBitmapWritesFlushForLogFileFull += 1; \
} else { \
FsStats->Ntfs.MftBitmapWritesUserRequest += 1; \
\
switch ((TLIC)->MajorFunction) { \
case IRP_MJ_WRITE: \
FsStats->Ntfs.MftBitmapWritesUserLevel.Write += 1; \
break; \
case IRP_MJ_CREATE: \
FsStats->Ntfs.MftBitmapWritesUserLevel.Create += 1; \
break; \
case IRP_MJ_SET_INFORMATION: \
FsStats->Ntfs.MftBitmapWritesUserLevel.SetInfo += 1; \
break; \
default: \
break; \
} \
} \
} \
} \
}
#define WriteToEof (StartingVbo < 0)
NTSTATUS
NtfsFsdWrite (
IN PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This routine implements the FSD part of Write.
Arguments:
VolumeDeviceObject - Supplies the volume device object where the
file exists
Irp - Supplies the Irp being processed
Return Value:
NTSTATUS - The FSD status for the IRP
--*/
{
TOP_LEVEL_CONTEXT TopLevelContext;
PTOP_LEVEL_CONTEXT ThreadTopLevelContext;
NTSTATUS Status = STATUS_SUCCESS;
PIRP_CONTEXT IrpContext = NULL;
UNREFERENCED_PARAMETER( VolumeDeviceObject );
ASSERT_IRP( Irp );
DebugTrace( +1, Dbg, ("NtfsFsdWrite\n") );
//
// Call the common Write routine
//
FsRtlEnterFileSystem();
ThreadTopLevelContext = NtfsSetTopLevelIrp( &TopLevelContext, FALSE, FALSE );
do {
try {
//
// We are either initiating this request or retrying it.
//
if (IrpContext == NULL) {
IrpContext = NtfsCreateIrpContext( Irp, CanFsdWait( Irp ) );
NtfsUpdateIrpContextWithTopLevel( IrpContext, ThreadTopLevelContext );
if (ThreadTopLevelContext->ScbBeingHotFixed != NULL) {
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_HOTFIX_UNDERWAY );
}
//
// If this is an MDL_WRITE then the Mdl in the Irp should
// be NULL.
//
if (FlagOn( IrpContext->MinorFunction, IRP_MN_MDL ) &&
!FlagOn( IrpContext->MinorFunction, IRP_MN_COMPLETE )) {
Irp->MdlAddress = NULL;
}
} else if (Status == STATUS_LOG_FILE_FULL) {
NtfsCheckpointForLogFileFull( IrpContext );
}
//
// If this is an Mdl complete request, don't go through
// common write.
//
ASSERT(!FlagOn( IrpContext->MinorFunction, IRP_MN_DPC ));
if (FlagOn( IrpContext->MinorFunction, IRP_MN_COMPLETE )) {
DebugTrace( 0, Dbg, ("Calling NtfsCompleteMdl\n") );
Status = NtfsCompleteMdl( IrpContext, Irp );
//
// Identify write requests which can't wait and post them to the
// Fsp.
//
} else {
//
// Capture the auxiliary buffer and clear its address if it
// is not supposed to be deleted by the I/O system on I/O completion.
//
if (Irp->Tail.Overlay.AuxiliaryBuffer != NULL) {
IrpContext->Union.AuxiliaryBuffer =
(PFSRTL_AUXILIARY_BUFFER)Irp->Tail.Overlay.AuxiliaryBuffer;
if (!FlagOn(IrpContext->Union.AuxiliaryBuffer->Flags,
FSRTL_AUXILIARY_FLAG_DEALLOCATE)) {
Irp->Tail.Overlay.AuxiliaryBuffer = NULL;
}
}
Status = NtfsCommonWrite( IrpContext, Irp );
}
break;
} except(NtfsExceptionFilter( IrpContext, GetExceptionInformation() )) {
NTSTATUS ExceptionCode;
//
// We had some trouble trying to perform the requested
// operation, so we'll abort the I/O request with
// the error status that we get back from the
// execption code
//
ExceptionCode = GetExceptionCode();
if (ExceptionCode == STATUS_FILE_DELETED) {
IrpContext->ExceptionStatus = ExceptionCode = STATUS_SUCCESS;
} else if (ExceptionCode == STATUS_VOLUME_DISMOUNTED) {
IrpContext->ExceptionStatus = ExceptionCode = STATUS_SUCCESS;
}
Status = NtfsProcessException( IrpContext,
Irp,
ExceptionCode );
}
} while ((Status == STATUS_CANT_WAIT || Status == STATUS_LOG_FILE_FULL) &&
(ThreadTopLevelContext == &TopLevelContext));
if (ThreadTopLevelContext == &TopLevelContext) {
NtfsRestoreTopLevelIrp( ThreadTopLevelContext );
}
FsRtlExitFileSystem();
//
// And return to our caller
//
DebugTrace( -1, Dbg, ("NtfsFsdWrite -> %08lx\n", Status) );
return Status;
}
NTSTATUS
NtfsCommonWrite (
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp
)
/*++
Routine Description:
This is the common routine for Write called by both the fsd and fsp
threads.
Arguments:
Irp - Supplies the Irp to process
Return Value:
NTSTATUS - The return status for the operation
--*/
{
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp;
PFILE_OBJECT FileObject;
PFILE_OBJECT UserFileObject;
TYPE_OF_OPEN TypeOfOpen;
PVCB Vcb;
PFCB Fcb;
PSCB Scb;
PCCB Ccb;
EOF_WAIT_BLOCK EofWaitBlock;
PFSRTL_ADVANCED_FCB_HEADER Header;
BOOLEAN OplockPostIrp = FALSE;
BOOLEAN PostIrp = FALSE;
PVOID SystemBuffer = NULL;
PVOID SafeBuffer = NULL;
BOOLEAN CalledByLazyWriter = FALSE;
BOOLEAN RecursiveWriteThrough = FALSE;
BOOLEAN ScbAcquired = FALSE;
BOOLEAN PagingIoResourceAcquired = FALSE;
BOOLEAN UpdateMft = FALSE;
BOOLEAN DoingIoAtEof = FALSE;
BOOLEAN SetWriteSeen = FALSE;
BOOLEAN CcFileSizeChangeDue = FALSE;
BOOLEAN Wait;
BOOLEAN OriginalWait;
BOOLEAN PagingIo;
BOOLEAN NonCachedIo;
BOOLEAN SynchronousIo;
NTFS_IO_CONTEXT LocalContext;
VBO StartingVbo;
LONGLONG ByteCount;
LONGLONG ByteRange;
LONGLONG OldFileSize;
PCOMPRESSED_DATA_INFO CompressedDataInfo;
ULONG EngineMatches;
ULONG CompressionUnitSize, ChunkSize;
PVOID NewBuffer;
PMDL NewMdl;
PMDL OriginalMdl;
PVOID OriginalBuffer;
ULONG TempLength;
PATTRIBUTE_RECORD_HEADER Attribute;
ATTRIBUTE_ENUMERATION_CONTEXT AttrContext;
BOOLEAN CleanupAttributeContext = FALSE;
LONGLONG LlTemp1;
LONGLONG LlTemp2;
ASSERT_IRP_CONTEXT( IrpContext );
ASSERT_IRP( Irp );
//
// Get the current Irp stack location
//
IrpSp = IoGetCurrentIrpStackLocation( Irp );
DebugTrace( +1, Dbg, ("NtfsCommonWrite\n") );
DebugTrace( 0, Dbg, ("IrpContext = %08lx\n", IrpContext) );
DebugTrace( 0, Dbg, ("Irp = %08lx\n", Irp) );
//
// Extract and decode the file object
//
UserFileObject = FileObject = IrpSp->FileObject;
TypeOfOpen = NtfsDecodeFileObject( IrpContext, FileObject, &Vcb, &Fcb, &Scb, &Ccb, TRUE );
//
// Let's kill invalid write requests.
//
if (TypeOfOpen != UserFileOpen &&
TypeOfOpen != UserVolumeOpen &&
TypeOfOpen != StreamFileOpen ) {
DebugTrace( 0, Dbg, ("Invalid file object for write\n") );
DebugTrace( -1, Dbg, ("NtfsCommonWrite: Exit -> %08lx\n", STATUS_INVALID_DEVICE_REQUEST) );
NtfsCompleteRequest( &IrpContext, &Irp, STATUS_INVALID_DEVICE_REQUEST );
return STATUS_INVALID_DEVICE_REQUEST;
}
//
// If this is a recursive request which has already failed then
// complete this request with STATUS_FILE_LOCK_CONFLICT. Always let the
// log file requests go through though since Cc won't get a chance to
// retry.
//
if (!FlagOn( Scb->ScbState, SCB_STATE_RESTORE_UNDERWAY ) &&
!NT_SUCCESS( IrpContext->TopLevelIrpContext->ExceptionStatus ) &&
(Scb != Scb->Vcb->LogFileScb)) {
NtfsCompleteRequest( &IrpContext, &Irp, STATUS_FILE_LOCK_CONFLICT );
return STATUS_FILE_LOCK_CONFLICT;
}
//
// Check if this volume has already been shut down. If it has, fail
// this write request.
//
//**** ASSERT( !FlagOn(Vcb->VcbState, VCB_STATE_FLAG_SHUTDOWN) );
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_SHUTDOWN)) {
Irp->IoStatus.Information = 0;
DebugTrace( 0, Dbg, ("Write for volume that is already shutdown.\n") );
DebugTrace( -1, Dbg, ("NtfsCommonWrite: Exit -> %08lx\n", STATUS_TOO_LATE) );
NtfsCompleteRequest( &IrpContext, &Irp, STATUS_TOO_LATE );
return STATUS_TOO_LATE;
}
//
// Initialize the appropriate local variables.
//
OriginalWait =
Wait = BooleanFlagOn( IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT );
PagingIo = BooleanFlagOn(Irp->Flags, IRP_PAGING_IO);
NonCachedIo = BooleanFlagOn(Irp->Flags,IRP_NOCACHE);
SynchronousIo = BooleanFlagOn(FileObject->Flags, FO_SYNCHRONOUS_IO);
DebugTrace( 0, Dbg, ("PagingIo -> %04x\n", PagingIo) );
DebugTrace( 0, Dbg, ("NonCachedIo -> %04x\n", NonCachedIo) );
DebugTrace( 0, Dbg, ("SynchronousIo -> %04x\n", SynchronousIo) );
ASSERT( PagingIo || FileObject->WriteAccess );
//
// Extract starting Vbo and offset.
//
StartingVbo = IrpSp->Parameters.Write.ByteOffset.QuadPart;
ByteCount = (LONGLONG) IrpSp->Parameters.Write.Length;
ByteRange = StartingVbo + ByteCount;
DebugTrace( 0, Dbg, ("StartingVbo -> %016I64x\n", StartingVbo) );
//
// Check for a null request, and return immediately
//
if ((ULONG)ByteCount == 0) {
Irp->IoStatus.Information = 0;
DebugTrace( 0, Dbg, ("No bytes to write\n") );
DebugTrace( -1, Dbg, ("NtfsCommonWrite: Exit -> %08lx\n", STATUS_SUCCESS) );
NtfsCompleteRequest( &IrpContext, &Irp, STATUS_SUCCESS );
return STATUS_SUCCESS;
}
//
// If this is async Io to a compressed stream
// then we will make this look synchronous.
//
if (Scb->CompressionUnit != 0) {
Wait = TRUE;
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT );
}
//
// See if we have to defer the write.
//
if (!PagingIo &&
(!NonCachedIo || (Scb->CompressionUnit != 0)) &&
!CcCanIWrite(FileObject,
(ULONG)ByteCount,
(BOOLEAN)(FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) &&
!FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_IN_FSP)),
BooleanFlagOn(IrpContext->Flags, IRP_CONTEXT_DEFERRED_WRITE))) {
BOOLEAN Retrying = BooleanFlagOn(IrpContext->Flags, IRP_CONTEXT_DEFERRED_WRITE);
NtfsPrePostIrp( IrpContext, Irp );
SetFlag( IrpContext->Flags, IRP_CONTEXT_DEFERRED_WRITE );
CcDeferWrite( FileObject,
(PCC_POST_DEFERRED_WRITE)NtfsAddToWorkque,
IrpContext,
Irp,
(ULONG)ByteCount,
Retrying );
return STATUS_PENDING;
}
//
// Use a local pointer to the Scb header for convenience.
//
Header = &Scb->Header;
//
// Make sure there is an initialized NtfsIoContext block.
//
if (TypeOfOpen == UserVolumeOpen
|| NonCachedIo) {
//
// If there is a context pointer, we need to make sure it was
// allocated and not a stale stack pointer.
//
if (IrpContext->Union.NtfsIoContext == NULL
|| !FlagOn( IrpContext->Flags, IRP_CONTEXT_FLAG_ALLOC_CONTEXT )) {
//
// If we can wait, use the context on the stack. Otherwise
// we need to allocate one.
//
if (Wait) {
IrpContext->Union.NtfsIoContext = &LocalContext;
ClearFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_ALLOC_CONTEXT );
} else {
IrpContext->Union.NtfsIoContext = (PNTFS_IO_CONTEXT)ExAllocateFromNPagedLookasideList( &NtfsIoContextLookasideList );
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_ALLOC_CONTEXT );
}
}
RtlZeroMemory( IrpContext->Union.NtfsIoContext, sizeof( NTFS_IO_CONTEXT ));
//
// Store whether we allocated this context structure in the structure
// itself.
//
IrpContext->Union.NtfsIoContext->AllocatedContext =
BooleanFlagOn( IrpContext->Flags, IRP_CONTEXT_FLAG_ALLOC_CONTEXT );
if (Wait) {
KeInitializeEvent( &IrpContext->Union.NtfsIoContext->Wait.SyncEvent,
NotificationEvent,
FALSE );
} else {
IrpContext->Union.NtfsIoContext->PagingIo = PagingIo;
IrpContext->Union.NtfsIoContext->Wait.Async.ResourceThreadId =
ExGetCurrentResourceThread();
IrpContext->Union.NtfsIoContext->Wait.Async.RequestedByteCount =
(ULONG)ByteCount;
}
}
DebugTrace( 0, Dbg, ("PagingIo -> %04x\n", PagingIo) );
DebugTrace( 0, Dbg, ("NonCachedIo -> %04x\n", NonCachedIo) );
DebugTrace( 0, Dbg, ("SynchronousIo -> %04x\n", SynchronousIo) );
DebugTrace( 0, Dbg, ("WriteToEof -> %04x\n", WriteToEof) );
//
// Handle volume Dasd here.
//
if (TypeOfOpen == UserVolumeOpen) {
//
// If the caller has not asked for extended DASD IO access then
// limit with the volume size.
//
if (!FlagOn( Ccb->Flags, CCB_FLAG_ALLOW_XTENDED_DASD_IO )) {
//
// If this is a volume file, we cannot write past the current
// end of file (volume). We check here now before continueing.
//
// If the starting vbo is past the end of the volume, we are done.
//
if (WriteToEof || (Header->FileSize.QuadPart <= StartingVbo)) {
DebugTrace( 0, Dbg, ("No bytes to write\n") );
DebugTrace( -1, Dbg, ("NtfsCommonWrite: Exit -> %08lx\n", STATUS_SUCCESS) );
NtfsCompleteRequest( &IrpContext, &Irp, STATUS_SUCCESS );
return STATUS_SUCCESS;
//
// If the write extends beyond the end of the volume, truncate the
// bytes to write.
//
} else if (Header->FileSize.QuadPart < ByteRange) {
ByteCount = Header->FileSize.QuadPart - StartingVbo;
}
}
SetFlag( UserFileObject->Flags, FO_FILE_MODIFIED );
Status = NtfsVolumeDasdIo( IrpContext,
Irp,
Vcb,
StartingVbo,
(ULONG)ByteCount );
//
// If the volume was opened for Synchronous IO, update the current
// file position.
//
if (SynchronousIo && !PagingIo && NT_SUCCESS(Status)) {
UserFileObject->CurrentByteOffset.QuadPart = StartingVbo + (LONGLONG) Irp->IoStatus.Information;
}
DebugTrace( 0, Dbg, ("Complete with %08lx bytes written\n", Irp->IoStatus.Information) );
DebugTrace( -1, Dbg, ("NtfsCommonWrite: Exit -> %08lx\n", Status) );
if (Wait) {
NtfsCompleteRequest( &IrpContext, &Irp, Status );
}
return Status;
}
//
// If this is a paging file, just send it to the device driver.
// We assume Mm is a good citizen.
//
if (FlagOn( Fcb->FcbState, FCB_STATE_PAGING_FILE )
&& FlagOn( Scb->ScbState, SCB_STATE_UNNAMED_DATA )) {
if (FlagOn( Fcb->FcbState, FCB_STATE_FILE_DELETED )) {
NtfsRaiseStatus( IrpContext, STATUS_FILE_DELETED, NULL, NULL );
}
//
// Do the usual STATUS_PENDING things.
//
IoMarkIrpPending( Irp );
//
// Perform the actual IO, it will be completed when the io finishes.
//
NtfsPagingFileIo( IrpContext,
Irp,
Scb,
StartingVbo,
(ULONG)ByteCount );
//
// We, nor anybody else, need the IrpContext any more.
//
NtfsCompleteRequest( &IrpContext, NULL, 0 );
return STATUS_PENDING;
}
//
// Accumulate interesting statistics.
//
if (PagingIo) {
CollectWriteStats( Vcb, TypeOfOpen, Scb, Fcb, ByteCount, IrpContext,
IrpContext->TopLevelIrpContext );
}
//
// Use a try-finally to free Scb and buffers on the way out.
// At this point we can treat all requests identically since we
// have a usable Scb for each of them. (Volume, User or Stream file)
//
Status = STATUS_SUCCESS;
try {
//
// If this is a noncached transfer and is not a paging I/O, and
// the file has been opened cached, then we will do a flush here
// to avoid stale data problems. Note that we must flush before
// acquiring the Fcb shared since the write may try to acquire
// it exclusive.
//
// CcFlushCache may not raise.
//
// The Purge following the flush will guarantee cache coherency.
//
if (NonCachedIo &&
!PagingIo &&
(TypeOfOpen != StreamFileOpen) &&
(FileObject->SectionObjectPointer->DataSectionObject != NULL)) {
//
// Acquire the paging io resource to test the compression state. If the
// file is compressed this will add serialization up to the point where
// CcCopyWrite flushes the data, but those flushes will be serialized
// anyway. Uncompressed files will need the paging io resource
// exclusive to do the flush.
//
ExAcquireResourceExclusive( Header->PagingIoResource, TRUE );
PagingIoResourceAcquired = TRUE;
if (Scb->CompressionUnit == 0) {
if (WriteToEof) {
FsRtlLockFsRtlHeader( Header );
IrpContext->FcbWithPagingExclusive = (PFCB) Scb;
}
CcFlushCache( &Scb->NonpagedScb->SegmentObject,
WriteToEof ? &Header->FileSize : (PLARGE_INTEGER)&StartingVbo,
(ULONG)ByteCount,
&Irp->IoStatus );
if (WriteToEof) {
FsRtlUnlockFsRtlHeader( Header );
IrpContext->FcbWithPagingExclusive = NULL;
}
//
// Make sure there was no error in the flush path.
//
if (!NT_SUCCESS( IrpContext->TopLevelIrpContext->ExceptionStatus ) ||
!NT_SUCCESS( Irp->IoStatus.Status )) {
NtfsNormalizeAndCleanupTransaction( IrpContext,
&Irp->IoStatus.Status,
TRUE,
STATUS_UNEXPECTED_IO_ERROR );
}
//
// Now purge the data for this range.
//
NtfsDeleteInternalAttributeStream( Scb, FALSE );
CcPurgeCacheSection( &Scb->NonpagedScb->SegmentObject,
(PLARGE_INTEGER)&StartingVbo,
(ULONG)ByteCount,
FALSE );
}
//
// Convert to shared but don't release the resource. This will synchronize
// this operation with defragging.
//
ExConvertExclusiveToSharedLite( Header->PagingIoResource );
}
if (PagingIo) {
//
// For all paging I/O, the correct resource has already been
// acquired shared - PagingIoResource if it exists, or else
// main Resource. In some rare cases this is not currently
// true (shutdown & segment dereference thread), so we acquire
// shared here, but we starve exclusive in these rare cases
// to be a little more resilient to deadlocks! Most of the
// time all we do is the test.
//
if ((Header->PagingIoResource != NULL) &&
!ExIsResourceAcquiredShared(Header->PagingIoResource) &&
!ExIsResourceAcquiredShared(Header->Resource)) {
ExAcquireSharedStarveExclusive( Header->PagingIoResource, TRUE );
PagingIoResourceAcquired = TRUE;
}
//
// Note that the lazy writer must not be allowed to try and
// acquire the resource exclusive. This is not a problem since
// the lazy writer is paging IO and thus not allowed to extend
// file size, and is never the top level guy, thus not able to
// extend valid data length.
//
if ((Scb->LazyWriteThread[0] == PsGetCurrentThread()) ||
(Scb->LazyWriteThread[1] == PsGetCurrentThread())) {
DebugTrace( 0, Dbg, ("Lazy writer generated write\n") );
CalledByLazyWriter = TRUE;
//
// If the temporary bit is set in the Scb then set the temporary
// bit in the file object. In case the temporary bit has changed
// in the Scb, this is a good file object to fix it in!
//
if (FlagOn( Scb->ScbState, SCB_STATE_TEMPORARY )) {
SetFlag( FileObject->Flags, FO_TEMPORARY_FILE );
} else {
ClearFlag( FileObject->Flags, FO_TEMPORARY_FILE );
}
//
// Test if we are the result of a recursive flush in the write path. In
// that case we won't have to update valid data.
//
} else {
//
// Check if we are recursing into write from a write via the
// cache manager.
//
if (FlagOn( IrpContext->TopLevelIrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_SEEN )) {
RecursiveWriteThrough = TRUE;
//
// If the top level request is a write to the same file object
// then set the write-through flag in the current Scb. We
// know the current request is not top-level because some
// other write has already set the bit in the top IrpContext.
//
if ((IrpContext->TopLevelIrpContext->MajorFunction == IRP_MJ_WRITE) &&
(IrpContext->TopLevelIrpContext->OriginatingIrp != NULL) &&
(FileObject->FsContext ==
IoGetCurrentIrpStackLocation( IrpContext->TopLevelIrpContext->OriginatingIrp )->FileObject->FsContext)) {
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH );
}
//
// Otherwise set the flag in the top level IrpContext showing that
// we have entered write.
//
} else {
SetFlag(IrpContext->TopLevelIrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_SEEN);
SetWriteSeen = TRUE;
//
// This is could be someone who extends valid data,
// like the Mapped Page Writer or a flush, so we have to
// duplicate code from below to serialize this guy with I/O
// at the end of the file. We do not extend valid data for
// metadata streams and need to eliminate them to avoid deadlocks
// later.
//
if (!FlagOn(Scb->ScbState, SCB_STATE_MODIFIED_NO_WRITE)) {
ASSERT(!WriteToEof);
//
// Now synchronize with the FsRtl Header
//
ExAcquireFastMutex( Header->FastMutex );
//
// Now see if we will change FileSize. We have to do it now
// so that our reads are not nooped.
//
if (ByteRange > Header->ValidDataLength.QuadPart) {
//
// Our caller may already be synchronized with EOF.
// The FcbWithPaging field in the top level IrpContext
// will have either the current Fcb/Scb if so.
//
if ((IrpContext->TopLevelIrpContext->FcbWithPagingExclusive == Fcb) ||
(IrpContext->TopLevelIrpContext->FcbWithPagingExclusive == (PFCB) Scb)) {
DoingIoAtEof = TRUE;
OldFileSize = Header->FileSize.QuadPart;
} else {
//
// We can change FileSize and ValidDataLength if either, no one
// else is now, or we are still extending after waiting.
// We won't block the mapped page writer on IoAtEof. Test
// the original state of the wait flag to know this.
//
if (FlagOn( Header->Flags, FSRTL_FLAG_EOF_ADVANCE_ACTIVE )) {
if (!OriginalWait) {
ExReleaseFastMutex( Header->FastMutex );
try_return( Status = STATUS_FILE_LOCK_CONFLICT );
}
DoingIoAtEof = NtfsWaitForIoAtEof( Header, (PLARGE_INTEGER)&StartingVbo, (ULONG)ByteCount, &EofWaitBlock );
} else {
DoingIoAtEof = TRUE;
}
//
// Set the Flag if we are changing FileSize or ValidDataLength,
// and save current values.
//
if (DoingIoAtEof) {
SetFlag( Header->Flags, FSRTL_FLAG_EOF_ADVANCE_ACTIVE );
//
// Store this in the IrpContext until commit or post
//
IrpContext->FcbWithPagingExclusive = (PFCB)Scb;
OldFileSize = Header->FileSize.QuadPart;
}
}
}
ExReleaseFastMutex( Header->FastMutex );
}
}
}
//
// If are paging io, then we do not want
// to write beyond end of file. If the base is beyond Eof, we will just
// Noop the call. If the transfer starts before Eof, but extends
// beyond, we will truncate the transfer to the last sector
// boundary.
//
// Just in case this is paging io, limit write to file size.
// Otherwise, in case of write through, since Mm rounds up
// to a page, we might try to acquire the resource exclusive
// when our top level guy only acquired it shared. Thus, =><=.
//
ExAcquireFastMutex( Header->FastMutex );
if (ByteRange > Header->FileSize.QuadPart) {
if (StartingVbo >= Header->FileSize.QuadPart) {
DebugTrace( 0, Dbg, ("PagingIo started beyond EOF.\n") );
Irp->IoStatus.Information = 0;
//
// Make sure we do not advance ValidDataLength!
//
ByteRange = Header->ValidDataLength.QuadPart;
ExReleaseFastMutex( Header->FastMutex );
try_return( Status = STATUS_SUCCESS );
} else {
DebugTrace( 0, Dbg, ("PagingIo extending beyond EOF.\n") );
ByteCount = Header->FileSize.QuadPart - StartingVbo;
ByteRange = Header->FileSize.QuadPart;
}
}
ExReleaseFastMutex( Header->FastMutex );
//
// If not paging I/O, then we must acquire a resource, and do some
// other initialization.
//
} else {
if (!PagingIoResourceAcquired &&
!ExAcquireSharedWaitForExclusive( Scb->Header.PagingIoResource, Wait )) {
NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL );
}
PagingIoResourceAcquired = TRUE;
//
// Check if we have already gone through cleanup on this handle.
//
if (FlagOn( Ccb->Flags, CCB_FLAG_CLEANUP )) {
NtfsRaiseStatus( IrpContext, STATUS_FILE_CLOSED, NULL, NULL );
}
//
// Now synchronize with the FsRtl Header
//
ExAcquireFastMutex( Header->FastMutex );
//
// Now see if we will change FileSize. We have to do it now
// so that our reads are not nooped.
//
if ((ByteRange > Header->ValidDataLength.QuadPart) || WriteToEof) {
//
// We expect this routine to be top level or, for the
// future, our caller is not already serialized.
//
ASSERT( IrpContext->TopLevelIrpContext->FcbWithPagingExclusive == NULL );
DoingIoAtEof = !FlagOn( Header->Flags, FSRTL_FLAG_EOF_ADVANCE_ACTIVE ) ||
NtfsWaitForIoAtEof( Header, (PLARGE_INTEGER)&StartingVbo, (ULONG)ByteCount, &EofWaitBlock );
//
// Set the Flag if we are changing FileSize or ValidDataLength,
// and save current values.
//
if (DoingIoAtEof) {
SetFlag( Header->Flags, FSRTL_FLAG_EOF_ADVANCE_ACTIVE );
//
// Store this in the IrpContext until commit or post
//
IrpContext->FcbWithPagingExclusive = (PFCB)Scb;
OldFileSize = Header->FileSize.QuadPart;
//
// Check for writing to end of File. If we are, then we have to
// recalculate the byte range.
//
if (WriteToEof) {
StartingVbo = Header->FileSize.QuadPart;
ByteRange = StartingVbo + ByteCount;
}
}
}
ExReleaseFastMutex( Header->FastMutex );
//
// We cannot handle user noncached I/Os to compressed files, so we always
// divert them through the cache with write through.
//
// The reason that we always handle the user requests through the cache,
// is that there is no other safe way to deal with alignment issues, for
// the frequent case where the user noncached I/O is not an integral of
// the Compression Unit. We cannot, for example, read the rest of the
// compression unit into a scratch buffer, because we are not synchronized
// with anyone mapped to the file and modifying the other data. If we
// try to assemble the data in the cache in the noncached path, to solve
// the above problem, then we have to somehow purge these pages away
// to solve cache coherency problems, but then the pages could be modified
// by a file mapper and that would be wrong, too.
//
// Bottom line is we can only really support cached writes to compresed
// files.
//
if ((Scb->CompressionUnit != 0) && NonCachedIo) {
NonCachedIo = FALSE;
if (Scb->FileObject == NULL) {
//
// Make sure we are serialized with the FileSizes, and
// will remove this condition if we abort.
//
if (!DoingIoAtEof) {
FsRtlLockFsRtlHeader( Header );
IrpContext->FcbWithPagingExclusive = (PFCB)Scb;
}
NtfsCreateInternalAttributeStream( IrpContext, Scb, FALSE );
if (!DoingIoAtEof) {
FsRtlUnlockFsRtlHeader( Header );
IrpContext->FcbWithPagingExclusive = NULL;
}
}
FileObject = Scb->FileObject;
SetFlag( FileObject->Flags, FO_WRITE_THROUGH );
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH );
}
if (!Wait && NonCachedIo) {
//
// Make sure we haven't exceeded our threshold for async requests
// on this thread.
//
if (ExIsResourceAcquiredShared( Header->PagingIoResource ) > MAX_SCB_ASYNC_ACQUIRE) {
NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL );
}
IrpContext->Union.NtfsIoContext->Wait.Async.Resource = Header->PagingIoResource;
}
//
// Set the flag in our IrpContext to indicate that we have entered
// write.
//
ASSERT( !FlagOn( IrpContext->TopLevelIrpContext->Flags,
IRP_CONTEXT_FLAG_WRITE_SEEN ));
SetFlag( IrpContext->TopLevelIrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_SEEN );
SetWriteSeen = TRUE;
}
//
// Now check if the attribute has been deleted or is on a dismounted volume.
//
if (FlagOn( Scb->ScbState, SCB_STATE_ATTRIBUTE_DELETED | SCB_STATE_VOLUME_DISMOUNTED)) {
if (FlagOn( Scb->ScbState, SCB_STATE_ATTRIBUTE_DELETED )) {
NtfsRaiseStatus( IrpContext, STATUS_FILE_DELETED, NULL, NULL );
} else {
NtfsRaiseStatus( IrpContext, STATUS_VOLUME_DISMOUNTED, NULL, NULL );
}
}
//
// If the Scb is uninitialized, we initialize it now.
// We skip this step for a $INDEX_ALLOCATION stream. We need to
// protect ourselves in the case where an $INDEX_ALLOCATION
// stream was created and deleted in an aborted transaction.
// In that case we may get a lazy-writer call which will
// naturally be nooped below since the valid data length
// in the Scb is 0.
//
if (!FlagOn( Scb->ScbState, SCB_STATE_HEADER_INITIALIZED )) {
if (Scb->AttributeTypeCode != $INDEX_ALLOCATION) {
DebugTrace( 0, Dbg, ("Initializing Scb -> %08lx\n", Scb) );
//
// Acquire and drop the Scb when doing this.
//
ExAcquireResourceShared( Scb->Header.Resource, TRUE );
ScbAcquired = TRUE;
NtfsUpdateScbFromAttribute( IrpContext, Scb, NULL );
ExReleaseResource( Scb->Header.Resource );
ScbAcquired = FALSE;
} else {
ASSERT( Header->ValidDataLength.QuadPart == Li0.QuadPart );
}
}
//
// We assert that Paging Io writes will never WriteToEof.
//
ASSERT( !WriteToEof || !PagingIo );
//
// We assert that we never get a non-cached io call for a non-$DATA,
// resident attribute.
//
ASSERTMSG( "Non-cached I/O call on resident system attribute\n",
NtfsIsTypeCodeUserData( Scb->AttributeTypeCode ) ||
!NonCachedIo ||
!FlagOn( Scb->ScbState, SCB_STATE_ATTRIBUTE_RESIDENT ));
//
// Here is the deal with ValidDataLength and FileSize:
//
// Rule 1: PagingIo is never allowed to extend file size.
//
// Rule 2: Only the top level requestor may extend Valid
// Data Length. This may be paging IO, as when a
// a user maps a file, but will never be as a result
// of cache lazy writer writes since they are not the
// top level request.
//
// Rule 3: If, using Rules 1 and 2, we decide we must extend
// file size or valid data, we take the Fcb exclusive.
//
//
// Now see if we are writing beyond valid data length, and thus
// maybe beyond the file size. If so, then we must
// release the Fcb and reacquire it exclusive. Note that it is
// important that when not writing beyond EOF that we check it
// while acquired shared and keep the FCB acquired, in case some
// turkey truncates the file. Note that for paging Io we will
// already have acquired the file correctly.
//
if (DoingIoAtEof) {
//
// If this was a non-cached asynchronous operation we will
// convert it to synchronous. This is to allow the valid
// data length change to go out to disk and to fix the
// problem of the Fcb being in the exclusive Fcb list.
//
if (!Wait && NonCachedIo) {
Wait = TRUE;
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT );
RtlZeroMemory( IrpContext->Union.NtfsIoContext, sizeof( NTFS_IO_CONTEXT ));
//
// Store whether we allocated this context structure in the structure
// itself.
//
IrpContext->Union.NtfsIoContext->AllocatedContext =
BooleanFlagOn( IrpContext->Flags, IRP_CONTEXT_FLAG_ALLOC_CONTEXT );
KeInitializeEvent( &IrpContext->Union.NtfsIoContext->Wait.SyncEvent,
NotificationEvent,
FALSE );
//
// If this is async Io to a compressed stream
// then we will make this look synchronous.
//
} else if (Scb->CompressionUnit != 0) {
Wait = TRUE;
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT );
}
//
// If the Scb is uninitialized, we initialize it now.
//
if (!FlagOn( Scb->ScbState, SCB_STATE_HEADER_INITIALIZED )) {
DebugTrace( 0, Dbg, ("Initializing Scb -> %08lx\n", Scb) );
//
// Acquire and drop the Scb when doing this.
//
//
// Acquire and drop the Scb when doing this.
//
ExAcquireResourceShared( Scb->Header.Resource, TRUE );
ScbAcquired = TRUE;
NtfsUpdateScbFromAttribute( IrpContext, Scb, NULL );
ExReleaseResource( Scb->Header.Resource );
ScbAcquired = FALSE;
}
}
//
// We check whether we can proceed based on the state of the file oplocks.
//
if (!PagingIo && (TypeOfOpen == UserFileOpen)) {
Status = FsRtlCheckOplock( &Scb->ScbType.Data.Oplock,
Irp,
IrpContext,
NtfsOplockComplete,
NtfsPrePostIrp );
if (Status != STATUS_SUCCESS) {
OplockPostIrp = TRUE;
PostIrp = TRUE;
try_return( NOTHING );
}
//
// This oplock call can affect whether fast IO is possible.
// We may have broken an oplock to no oplock held. If the
// current state of the file is FastIoIsNotPossible then
// recheck the fast IO state.
//
if (Header->IsFastIoPossible == FastIoIsNotPossible) {
NtfsAcquireFsrtlHeader( Scb );
Header->IsFastIoPossible = NtfsIsFastIoPossible( Scb );
NtfsReleaseFsrtlHeader( Scb );
}
//
// We have to check for write access according to the current
// state of the file locks, and set FileSize from the Fcb.
//
if (!PagingIo &&
(Scb->ScbType.Data.FileLock != NULL) &&
!FsRtlCheckLockForWriteAccess( Scb->ScbType.Data.FileLock, Irp )) {
try_return( Status = STATUS_FILE_LOCK_CONFLICT );
}
}
// ASSERT( Header->ValidDataLength.QuadPart <= Header->FileSize.QuadPart);
//
// If the ByteRange now exceeds our maximum value, then
// return an error.
//
if (ByteRange < StartingVbo) {
try_return( Status = STATUS_INVALID_PARAMETER );
}
//
// If we are extending a file size, we may have to extend the allocation.
// For a non-resident attribute, this is a call to the add allocation
// routine. For a resident attribute it depends on whether we
// can use the change attribute routine to automatically extend
// the attribute.
//
if (DoingIoAtEof) {
//
// EXTENDING THE FILE
//
//
// If the write goes beyond the allocation size, add some
// file allocation.
//
if (ByteRange > Header->AllocationSize.QuadPart) {
BOOLEAN NonResidentPath;
NtfsAcquireExclusiveScb( IrpContext, Scb );
ScbAcquired = TRUE;
//
// We have to deal with both the resident and non-resident
// case. For the resident case we do the work here
// only if the new size is too large for the change attribute
// value routine.
//
if (FlagOn( Scb->ScbState, SCB_STATE_ATTRIBUTE_RESIDENT )) {
PFILE_RECORD_SEGMENT_HEADER FileRecord;
NonResidentPath = FALSE;
//
// Now call the attribute routine to change the value, remembering
// the values up to the current valid data length.
//
NtfsInitializeAttributeContext( &AttrContext );
CleanupAttributeContext = TRUE;
NtfsLookupAttributeForScb( IrpContext,
Scb,
NULL,
&AttrContext );
FileRecord = NtfsContainingFileRecord( &AttrContext );
Attribute = NtfsFoundAttribute( &AttrContext );
LlTemp1 = (LONGLONG) (Vcb->BytesPerFileRecordSegment
- FileRecord->FirstFreeByte
+ QuadAlign( Attribute->Form.Resident.ValueLength ));
//
// If the new attribute size will not fit then we have to be
// prepared to go non-resident. If the byte range takes more
// more than 32 bits or this attribute is big enough to move
// then it will go non-resident. Otherwise we simply may
// end up moving another attribute or splitting the file
// record.
//
//
// Note, there is an infinitesimal chance that before the Lazy Writer
// writes the data for an attribute which is extending, but fits
// when we check it here, that some other attribute will grow,
// and this attribute no longer fits. If in addition, the disk
// is full, then the Lazy Writer will fail to allocate space
// for the data when it gets around to writing. This is
// incredibly unlikely, and not fatal; the Lazy Writer gets an
// error rather than the user. What we are trying to avoid is
// having to update the attribute every time on small writes
// (also see comments below in NONCACHED RESIDENT ATTRIBUTE case).
//
if (ByteRange > LlTemp1) {
//
// Go ahead and convert this attribute to non-resident.
// Then take the non-resident path below. There is a chance
// that there was a more suitable candidate to move non-resident
// but we don't want to change the file size until we copy
// the user's data into the cache in case the buffer is
// corrupt.
//
NtfsConvertToNonresident( IrpContext,
Fcb,
Attribute,
NonCachedIo,
&AttrContext );
NonResidentPath = TRUE;
//
// If there is room for the data, we will write a zero
// to the last byte to reserve the space since the
// Lazy Writer cannot grow the attribute with shared
// access.
//
} else {
//
// The attribute will stay resident because we
// have already checked that it will fit. It will
// not update the file size and valid data size in
// the Scb.
//
NtfsChangeAttributeValue( IrpContext,
Fcb,
(ULONG) ByteRange,
NULL,
0,
TRUE,
FALSE,
FALSE,
FALSE,
&AttrContext );
Header->AllocationSize.LowPart = QuadAlign( (ULONG)ByteRange );
Scb->TotalAllocated = Header->AllocationSize.QuadPart;
}
NtfsCleanupAttributeContext( &AttrContext );
CleanupAttributeContext = FALSE;
} else {
NonResidentPath = TRUE;
}
//
// Note that we may have gotten all the space we need when
// we converted to nonresident above, so we have to check
// again if we are extending.
//
if (NonResidentPath &&
ByteRange > Header->AllocationSize.QuadPart) {
//
// Assume we are allocating contiguously from AllocationSize.
//
LlTemp1 = Header->AllocationSize.QuadPart;
//
// If the file is compressed, we want to limit how far we are
// willing to go beyond ValidDataLength, because we would just
// have to throw that space away anyway in NtfsZeroData. If
// we would have to zero more than two compression units (same
// limit as NtfsZeroData), then just allocate space where we
// need it.
//
if (FlagOn(Scb->ScbState, SCB_STATE_COMPRESSED) &&
((StartingVbo - Header->ValidDataLength.QuadPart)
> (LONGLONG) (Scb->CompressionUnit * 2))) {
LlTemp1 = StartingVbo;
(ULONG)LlTemp1 &= ~(Scb->CompressionUnit - 1);
}
LlTemp2 = ByteRange - LlTemp1;
//
// This will add the allocation and modify the allocation
// size in the Scb.
//
NtfsAddAllocation( IrpContext,
FileObject,
Scb,
LlClustersFromBytes( Vcb, LlTemp1 ),
LlClustersFromBytes( Vcb, LlTemp2 ),
TRUE );
//
// Assert that the allocation worked
//
ASSERT( Header->AllocationSize.QuadPart >= ByteRange ||
(Scb->CompressionUnit != 0));
SetFlag(Scb->ScbState, SCB_STATE_TRUNCATE_ON_CLOSE);
}
//
// Now that we have grown the attribute, it is important to
// checkpoint the current transaction and free all main resources
// to avoid the tc type deadlocks. Note that the extend is ok
// to stand in its own right, and the stream will be truncated
// on close anyway.
//
NtfsCheckpointCurrentTransaction( IrpContext );
//
// Growing allocation can change file size (in ChangeAttributeValue).
// Make sure we know the correct value for file size to restore.
//
OldFileSize = Header->FileSize.QuadPart;
while (!IsListEmpty(&IrpContext->ExclusiveFcbList)) {
NtfsReleaseFcb( IrpContext,
(PFCB)CONTAINING_RECORD(IrpContext->ExclusiveFcbList.Flink,
FCB,
ExclusiveFcbLinks ));
}
#ifdef _CAIRO_
//
// Go through and free any Scb's in the queue of shared
// Scb's for transactions.
//
if (IrpContext->SharedScb != NULL) {
NtfsReleaseSharedResources( IrpContext );
}
#endif // _CAIRO_
ScbAcquired = FALSE;
}
//
// Now synchronize with the FsRtl Header and set FileSize
// now so that our reads will not get truncated.
//
ExAcquireFastMutex( Header->FastMutex );
if (ByteRange > Header->FileSize.QuadPart) {
ASSERT( ByteRange <= Header->AllocationSize.QuadPart );
Header->FileSize.QuadPart = ByteRange;
SetFlag( UserFileObject->Flags, FO_FILE_SIZE_CHANGED );
}
ExReleaseFastMutex( Header->FastMutex );
//
// Extend the cache map, letting mm knows the new file size.
//
if (CcIsFileCached(FileObject) && !PagingIo) {
CcSetFileSizes( FileObject, (PCC_FILE_SIZES)&Header->AllocationSize );
} else {
CcFileSizeChangeDue = TRUE;
}
}
//
// HANDLE THE NONCACHED RESIDENT ATTRIBUTE CASE
//
// We let the cached case take the normal path for the following
// reasons:
//
// o To insure data coherency if a user maps the file
// o To get a page in the cache to keep the Fcb around
// o So the data can be accessed via the Fast I/O path
// o To reduce the number of calls to NtfsChangeAttributeValue,
// to infrequent calls from the Lazy Writer. Calls to CcCopyWrite
// are much cheaper. With any luck, if the attribute actually stays
// resident, we will only have to update it (and log it) once
// when the Lazy Writer gets around to the data.
//
// The disadvantage is the overhead to fault the data in the
// first time, but we may be able to do this with asynchronous
// read ahead.
//
if (FlagOn( Scb->ScbState, SCB_STATE_ATTRIBUTE_RESIDENT | SCB_STATE_CONVERT_UNDERWAY )
&& NonCachedIo) {
//
// The attribute is already resident and we have already tested
// if we are going past the end of the file.
//
DebugTrace( 0, Dbg, ("Resident attribute write\n") );
//
// If this buffer is not in system space then we can't
// trust it. In that case we will allocate a temporary buffer
// and copy the user's data to it.
//
SystemBuffer = NtfsMapUserBuffer( Irp );
if (!PagingIo && (Irp->RequestorMode != KernelMode)) {
SafeBuffer = NtfsAllocatePool( NonPagedPool,
(ULONG) ByteCount );
try {
RtlCopyMemory( SafeBuffer, SystemBuffer, (ULONG)ByteCount );
} except( EXCEPTION_EXECUTE_HANDLER ) {
try_return( Status = STATUS_INVALID_USER_BUFFER );
}
SystemBuffer = SafeBuffer;
}
NtfsAcquireExclusiveScb( IrpContext, Scb );
ScbAcquired = TRUE;
//
// Now see if the file is still resident, and if not
// fall through below.
//
if (FlagOn( Scb->ScbState, SCB_STATE_ATTRIBUTE_RESIDENT )) {
//
// If this Scb is for an $EA attribute which is now resident then
// we don't want to write the data into the attribute. All resident
// EA's are modified directly.
//
if (Scb->AttributeTypeCode != $EA) {
NtfsInitializeAttributeContext( &AttrContext );
CleanupAttributeContext = TRUE;
NtfsLookupAttributeForScb( IrpContext,
Scb,
NULL,
&AttrContext );
Attribute = NtfsFoundAttribute( &AttrContext );
//
// The attribute should already be optionally extended,
// just write the data to it now.
//
NtfsChangeAttributeValue( IrpContext,
Fcb,
((ULONG)StartingVbo),
SystemBuffer,
(ULONG)ByteCount,
(BOOLEAN)((((ULONG)StartingVbo) + (ULONG)ByteCount) >
Attribute->Form.Resident.ValueLength),
FALSE,
FALSE,
FALSE,
&AttrContext );
}
Irp->IoStatus.Information = (ULONG)ByteCount;
try_return( Status = STATUS_SUCCESS );
//
// Gee, someone else made the file nonresident, so we can just
// free the resource and get on with life.
//
} else {
NtfsReleaseScb( IrpContext, Scb );
ScbAcquired = FALSE;
}
}
//
// HANDLE THE NON-CACHED CASE
//
if (NonCachedIo) {
ULONG SectorSize;
ULONG BytesToWrite;
//
// Get the sector size
//
SectorSize = Vcb->BytesPerSector;
//
// Round up to a sector boundry
//
BytesToWrite = ((ULONG)ByteCount + (SectorSize - 1))
& ~(SectorSize - 1);
//
// All requests should be well formed and
// make sure we don't wipe out any data
//
if ((((ULONG)StartingVbo) & (SectorSize - 1))
|| ((BytesToWrite != (ULONG)ByteCount)
&& ByteRange < Header->ValidDataLength.QuadPart )) {
//**** we only reach this path via fast I/O and by returning not implemented we
//**** force it to return to use via slow I/O
DebugTrace( 0, Dbg, ("NtfsCommonWrite -> STATUS_NOT_IMPLEMENTED\n") );
try_return( Status = STATUS_NOT_IMPLEMENTED );
}
//
// If this noncached transfer is at least one sector beyond
// the current ValidDataLength in the Scb, then we have to
// zero the sectors in between. This can happen if the user
// has opened the file noncached, or if the user has mapped
// the file and modified a page beyond ValidDataLength. It
// *cannot* happen if the user opened the file cached, because
// ValidDataLength in the Fcb is updated when he does the cached
// write (we also zero data in the cache at that time), and
// therefore, we will bypass this action when the data
// is ultimately written through (by the Lazy Writer).
//
// For the paging file we don't care about security (ie.
// stale data), do don't bother zeroing.
//
// We can actually get writes wholly beyond valid data length
// from the LazyWriter because of paging Io decoupling.
//
// We drop this zeroing on the floor in any case where this
// request is a recursive write caused by a flush from a higher level write.
//
if (!CalledByLazyWriter &&
!RecursiveWriteThrough &&
(StartingVbo > Header->ValidDataLength.QuadPart)) {
if (!NtfsZeroData( IrpContext,
Scb,
FileObject,
Header->ValidDataLength.QuadPart,
StartingVbo - Header->ValidDataLength.QuadPart )) {
//
// The zeroing didn't complete but we might have moved
// valid data length up and committed. We don't want
// to set the file size below this value.
//
ExAcquireFastMutex( Header->FastMutex );
if (OldFileSize < Header->ValidDataLength.QuadPart) {
OldFileSize = Header->ValidDataLength.QuadPart;
}
ExReleaseFastMutex( Header->FastMutex );
NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL );
}
//
// Data was zeroed up to the StartingVbo. Update our old file
// size to that point.
//
OldFileSize = StartingVbo;
}
//
// If this Scb uses update sequence protection, we need to transform
// the blocks to a protected version. We first allocate an auxilary
// buffer and Mdl. Then we copy the data to this buffer and
// transform it. Finally we attach this Mdl to the Irp and use
// it to perform the Io.
//
if (FlagOn( Scb->ScbState, SCB_STATE_USA_PRESENT )) {
TempLength = BytesToWrite;
//
// Find the system buffer for this request and initialize the
// local state.
//
SystemBuffer = NtfsMapUserBuffer( Irp );
OriginalMdl = Irp->MdlAddress;
OriginalBuffer = Irp->UserBuffer;
NewBuffer = NULL;
//
// Protect this operation with a try-finally.
//
try {
//
// If this is the Mft Scb and the range of bytes falls into
// the range for the Mirror Mft, we generate a write to
// the mirror as well.
//
if ((Scb == Vcb->MftScb)
&& StartingVbo < Vcb->Mft2Scb->Header.FileSize.QuadPart) {
LlTemp1 = Vcb->Mft2Scb->Header.FileSize.QuadPart - StartingVbo;
if ((ULONG)LlTemp1 > BytesToWrite) {
(ULONG)LlTemp1 = BytesToWrite;
}
CcCopyWrite( Vcb->Mft2Scb->FileObject,
(PLARGE_INTEGER)&StartingVbo,
(ULONG)LlTemp1,
TRUE,
SystemBuffer );
//
// Now flush this to disk.
//
CcFlushCache( &Vcb->Mft2Scb->NonpagedScb->SegmentObject,
(PLARGE_INTEGER)&StartingVbo,
(ULONG)LlTemp1,
&Irp->IoStatus );
NtfsCleanupTransaction( IrpContext, Irp->IoStatus.Status, TRUE );
}
//
// Start by allocating buffer and Mdl.
//
NtfsCreateMdlAndBuffer( IrpContext,
Scb,
0,
&TempLength,
&NewMdl,
&NewBuffer );
//
// Now transform and write out the original stream.
//
RtlCopyMemory( NewBuffer, SystemBuffer, BytesToWrite );
//
// Now increment the sequence number in both the original
// and copied buffer, and transform the copied buffer.
//
NtfsTransformUsaBlock( Scb,
SystemBuffer,
NewBuffer,
BytesToWrite );
//
// We copy our Mdl into the Irp and then perform the Io.
//
Irp->MdlAddress = NewMdl;
Irp->UserBuffer = NewBuffer;
ASSERT( Wait );
NtfsNonCachedIo( IrpContext,
Irp,
Scb,
StartingVbo,
BytesToWrite,
FALSE );
} finally {
//
// In all cases we restore the user's Mdl and cleanup
// our Mdl and buffer.
//
if (NewBuffer != NULL) {
Irp->MdlAddress = OriginalMdl;
Irp->UserBuffer = OriginalBuffer;
NtfsDeleteMdlAndBuffer( NewMdl, NewBuffer );
}
}
//
// Otherwise we simply perform the Io.
//
} else {
Status = NtfsNonCachedIo( IrpContext,
Irp,
Scb,
StartingVbo,
BytesToWrite,
(FileObject->SectionObjectPointer != &Scb->NonpagedScb->SegmentObject) );
#ifdef SYSCACHE
if ((NodeType(Scb) == NTFS_NTC_SCB_DATA) &&
FlagOn(Scb->ScbState, SCB_STATE_SYSCACHE_FILE)) {
PULONG WriteMask;
ULONG Len;
ULONG Off = (ULONG)StartingVbo;
if (FlagOn(Scb->ScbState, SCB_STATE_SYSCACHE_FILE)) {
FsRtlVerifySyscacheData( FileObject,
MmGetSystemAddressForMdl(Irp->MdlAddress),
BytesToWrite,
(ULONG)StartingVbo );
}
WriteMask = Scb->ScbType.Data.WriteMask;
if (WriteMask == NULL) {
WriteMask = NtfsAllocatePool( NonPagedPool, (((0x2000000) / PAGE_SIZE) / 8) );
Scb->ScbType.Data.WriteMask = WriteMask;
RtlZeroMemory(WriteMask, (((0x2000000) / PAGE_SIZE) / 8));
}
if (Off < 0x2000000) {
Len = BytesToWrite;
if ((Off + Len) > 0x2000000) {
Len = 0x2000000 - Off;
}
while (Len != 0) {
WriteMask[(Off / PAGE_SIZE)/32] |= (1 << ((Off / PAGE_SIZE) % 32));
Off += PAGE_SIZE;
if (Len <= PAGE_SIZE) {
break;
}
Len -= PAGE_SIZE;
}
}
}
#endif
if (Status == STATUS_PENDING) {
IrpContext->Union.NtfsIoContext = NULL;
PagingIoResourceAcquired = FALSE;
Irp = NULL;
try_return( Status );
}
//
// On successful uncompressed writes, take this opportunity to
// update ValidDataToDisk. Unfortunately this field is
// synchronized by the main resource, but this resource should
// be fairly available for uncompressed streams anyway.
//
if ((Scb->CompressionUnit == 0) &&
!FlagOn(Scb->ScbState, SCB_STATE_MODIFIED_NO_WRITE) &&
NT_SUCCESS(Status)) {
LlTemp1 = StartingVbo + BytesToWrite;
ExAcquireResourceExclusive( Header->Resource, TRUE );
if (Scb->ValidDataToDisk < LlTemp1) {
Scb->ValidDataToDisk = LlTemp1;
}
ExReleaseResource( Header->Resource );
}
}
//
// Show that we want to immediately update the Mft.
//
UpdateMft = TRUE;
//
// If the call didn't succeed, raise the error status
//
if (!NT_SUCCESS( Status = Irp->IoStatus.Status )) {
NtfsNormalizeAndRaiseStatus( IrpContext, Status, STATUS_UNEXPECTED_IO_ERROR );
} else {
//
// Else set the context block to reflect the entire write
// Also assert we got how many bytes we asked for.
//
ASSERT( Irp->IoStatus.Information == BytesToWrite );
Irp->IoStatus.Information = (ULONG)ByteCount;
}
//
// The transfer is either complete, or the Iosb contains the
// appropriate status.
//
try_return( Status );
} // if No Intermediate Buffering
//
// HANDLE THE CACHED CASE
//
ASSERT( !PagingIo );
//
// We delay setting up the file cache until now, in case the
// caller never does any I/O to the file, and thus
// FileObject->PrivateCacheMap == NULL.
//
if (FileObject->PrivateCacheMap == NULL) {
DebugTrace( 0, Dbg, ("Initialize cache mapping.\n") );
//
// Get the file allocation size, and if it is less than
// the file size, raise file corrupt error.
//
if (Header->FileSize.QuadPart > Header->AllocationSize.QuadPart) {
NtfsRaiseStatus( IrpContext, STATUS_FILE_CORRUPT_ERROR, NULL, Fcb );
}
//
// Now initialize the cache map. Notice that we may extending
// the ValidDataLength with this write call. At this point
// we haven't updated the ValidDataLength in the Scb header.
// This way we will get a call from the cache manager
// when the lazy writer writes out the data.
//
//
// Make sure we are serialized with the FileSizes, and
// will remove this condition if we abort.
//
if (!DoingIoAtEof) {
FsRtlLockFsRtlHeader( Header );
IrpContext->FcbWithPagingExclusive = (PFCB)Scb;
}
CcInitializeCacheMap( FileObject,
(PCC_FILE_SIZES)&Header->AllocationSize,
FALSE,
&NtfsData.CacheManagerCallbacks,
Scb );
if (CcFileSizeChangeDue) {
CcSetFileSizes( FileObject, (PCC_FILE_SIZES)&Header->AllocationSize );
}
if (!DoingIoAtEof) {
FsRtlUnlockFsRtlHeader( Header );
IrpContext->FcbWithPagingExclusive = NULL;
}
CcSetReadAheadGranularity( FileObject, READ_AHEAD_GRANULARITY );
}
//
// Remember if we need to update the Mft.
//
if (!FlagOn( Scb->ScbState, SCB_STATE_ATTRIBUTE_RESIDENT )) {
UpdateMft = BooleanFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH);
}
//
// If this write is beyond valid data length, then we
// must zero the data in between.
//
LlTemp1 = StartingVbo - Header->ValidDataLength.QuadPart;
if (LlTemp1 > 0) {
//
// If the caller is writing zeros way beyond ValidDataLength,
// then noop it.
//
if (LlTemp1 > PAGE_SIZE &&
ByteCount <= sizeof(LARGE_INTEGER) &&
(RtlEqualMemory( NtfsMapUserBuffer( Irp ),
&Li0,
(ULONG)ByteCount ) )) {
ByteRange = Header->ValidDataLength.QuadPart;
Irp->IoStatus.Information = (ULONG)ByteCount;
try_return( Status = STATUS_SUCCESS );
}
//
// Call the Cache Manager to zero the data.
//
if (!NtfsZeroData( IrpContext,
Scb,
FileObject,
Header->ValidDataLength.QuadPart,
LlTemp1 )) {
//
// The zeroing didn't complete but we might have moved
// valid data length up and committed. We don't want
// to set the file size below this value.
//
ExAcquireFastMutex( Header->FastMutex );
if (OldFileSize < Scb->Header.ValidDataLength.QuadPart) {
OldFileSize = Scb->Header.ValidDataLength.QuadPart;
}
ExReleaseFastMutex( Header->FastMutex );
NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL );
}
//
// Data was zeroed up to the StartingVbo. Update our old file
// size to that point.
//
OldFileSize = StartingVbo;
}
//
// For a compressed stream, we must first reserve the space.
//
if (FlagOn(Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK) &&
!FlagOn(Scb->ScbState, SCB_STATE_REALLOCATE_ON_WRITE) &&
!NtfsReserveClusters(IrpContext, Scb, StartingVbo, (ULONG)ByteCount)) {
NtfsRaiseStatus( IrpContext, STATUS_DISK_FULL, NULL, NULL );
}
//
// We need to go through the cache for this
// file object. First handle the noncompressed calls.
//
#ifdef _CAIRO_
if (!FlagOn(IrpContext->MinorFunction, IRP_MN_COMPRESSED)) {
#endif _CAIRO_
//
// DO A NORMAL CACHED WRITE, if the MDL bit is not set,
//
if (!FlagOn(IrpContext->MinorFunction, IRP_MN_MDL)) {
DebugTrace( 0, Dbg, ("Cached write.\n") );
//
// Get hold of the user's buffer.
//
SystemBuffer = NtfsMapUserBuffer( Irp );
//
// Do the write, possibly writing through
//
if (!CcCopyWrite( FileObject,
(PLARGE_INTEGER)&StartingVbo,
(ULONG)ByteCount,
BooleanFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT),
SystemBuffer )) {
DebugTrace( 0, Dbg, ("Cached Write could not wait\n") );
NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL );
} else if (!NT_SUCCESS( IrpContext->ExceptionStatus )) {
NtfsRaiseStatus( IrpContext, IrpContext->ExceptionStatus, NULL, NULL );
}
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = (ULONG)ByteCount;
try_return( Status = STATUS_SUCCESS );
} else {
//
// DO AN MDL WRITE
//
DebugTrace( 0, Dbg, ("MDL write.\n") );
ASSERT( FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) );
//
// If we got this far and then hit a log file full the Mdl will
// already be present.
//
ASSERT(Irp->MdlAddress == NULL);
CcPrepareMdlWrite( FileObject,
(PLARGE_INTEGER)&StartingVbo,
(ULONG)ByteCount,
&Irp->MdlAddress,
&Irp->IoStatus );
Status = Irp->IoStatus.Status;
ASSERT( NT_SUCCESS( Status ));
try_return( Status );
}
//
// Handle the compressed calls.
//
#ifdef _CAIRO_
} else {
ASSERT((StartingVbo & (NTFS_CHUNK_SIZE - 1)) == 0);
if ((Header->FileObjectC == NULL) ||
(Header->FileObjectC->PrivateCacheMap == NULL)) {
//
// Make sure we are serialized with the FileSizes, and
// will remove this condition if we abort.
//
if (!DoingIoAtEof) {
FsRtlLockFsRtlHeader( Header );
IrpContext->FcbWithPagingExclusive = (PFCB)Scb;
}
NtfsCreateInternalCompressedStream( IrpContext, Scb, FALSE );
if (CcFileSizeChangeDue) {
CcSetFileSizes( FileObject, (PCC_FILE_SIZES)&Header->AllocationSize );
}
if (!DoingIoAtEof) {
FsRtlUnlockFsRtlHeader( Header );
IrpContext->FcbWithPagingExclusive = NULL;
}
}
//
// Assume success.
//
Irp->IoStatus.Status = Status = STATUS_SUCCESS;
Irp->IoStatus.Information = (ULONG)(ByteRange - StartingVbo);
//
// Based on the Mdl minor function, set up the appropriate
// parameters for the call below. (NewMdl is not exactly the
// right type, so it is cast...)
//
if (!FlagOn(IrpContext->MinorFunction, IRP_MN_MDL)) {
//
// Get hold of the user's buffer.
//
SystemBuffer = NtfsMapUserBuffer( Irp );
NewMdl = NULL;
} else {
//
// We will deliver the Mdl directly to the Irp.
//
SystemBuffer = NULL;
NewMdl = (PMDL)&Irp->MdlAddress;
}
CompressedDataInfo = (PCOMPRESSED_DATA_INFO)IrpContext->Union.AuxiliaryBuffer->Buffer;
//
// Calculate the compression unit and chunk sizes.
//
CompressionUnitSize = 1 << CompressedDataInfo->CompressionUnitShift;
ChunkSize = 1 << CompressedDataInfo->ChunkShift;
//
// See if the engine matches, so we can pass that on to the
// compressed write routine.
//
EngineMatches =
((CompressedDataInfo->CompressionFormatAndEngine == ((Scb->AttributeFlags & ATTRIBUTE_FLAG_COMPRESSION_MASK) + 1)) &&
(CompressedDataInfo->CompressionUnitShift == (Scb->CompressionUnitShift + Vcb->ClusterShift)) &&
(CompressedDataInfo->ChunkShift == NTFS_CHUNK_SHIFT));
//
// Do the compressed write in common code with the Fast Io path.
// We do it from a loop because we may need to create the other
// data stream.
//
while (TRUE) {
Status = NtfsCompressedCopyWrite( FileObject,
(PLARGE_INTEGER)&StartingVbo,
(ULONG)ByteCount,
SystemBuffer,
(PMDL *)NewMdl,
CompressedDataInfo,
IoGetRelatedDeviceObject(FileObject),
Header,
CompressionUnitSize,
ChunkSize,
EngineMatches );
//
// On successful Mdl requests we hang on to the PagingIo resource.
//
if ((NewMdl != NULL) && NT_SUCCESS(Status)) {
PagingIoResourceAcquired = FALSE;
}
//
// Check for the status that says we need to create the normal
// data stream, else we are done.
//
if (Status != STATUS_NOT_MAPPED_DATA) {
break;
}
//
// Create the normal data stream and loop back to try again.
//
ASSERT(Scb->FileObject == NULL);
//
// Make sure we are serialized with the FileSizes, and
// will remove this condition if we abort.
//
if (!DoingIoAtEof) {
FsRtlLockFsRtlHeader( Header );
IrpContext->FcbWithPagingExclusive = (PFCB)Scb;
}
NtfsCreateInternalAttributeStream( IrpContext, Scb, FALSE );
if (CcFileSizeChangeDue) {
CcSetFileSizes( FileObject, (PCC_FILE_SIZES)&Header->AllocationSize );
}
if (!DoingIoAtEof) {
FsRtlUnlockFsRtlHeader( Header );
IrpContext->FcbWithPagingExclusive = NULL;
}
}
}
#endif _CAIRO_
try_exit: NOTHING;
if (Irp) {
if (PostIrp) {
//
// If we acquired this Scb exclusive, we won't need to release
// the Scb. That is done in the oplock post request.
//
if (OplockPostIrp) {
ScbAcquired = FALSE;
}
//
// If we didn't post the Irp, we may have written some bytes to the
// file. We report the number of bytes written and update the
// file object for synchronous writes.
//
} else {
DebugTrace( 0, Dbg, ("Completing request with status = %08lx\n", Status) );
DebugTrace( 0, Dbg, (" Information = %08lx\n",
Irp->IoStatus.Information));
//
// Record the total number of bytes actually written
//
LlTemp1 = Irp->IoStatus.Information;
//
// If the file was opened for Synchronous IO, update the current
// file position.
//
if (SynchronousIo && !PagingIo) {
UserFileObject->CurrentByteOffset.QuadPart = StartingVbo + LlTemp1;
}
//
// The following are things we only do if we were successful
//
if (NT_SUCCESS( Status )) {
//
// Mark that the modify time needs to be updated on close.
// Note that only the top level User requests will generate
// correct
if (!PagingIo) {
//
// Set the flag in the file object to know we modified this file.
//
SetFlag( UserFileObject->Flags, FO_FILE_MODIFIED );
//
// On successful paging I/O to a compressed data stream which is
// not mapped, we free any reserved space for the stream.
//
} else {
if (FlagOn(Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK)) {
if (!FlagOn(Header->Flags, FSRTL_FLAG_USER_MAPPED_FILE) &&
(Header->NodeTypeCode == NTFS_NTC_SCB_DATA)) {
NtfsFreeReservedClusters( Scb,
StartingVbo,
Irp->IoStatus.Information );
}
}
}
//
// If we extended the file size and we are meant to
// immediately update the dirent, do so. (This flag is
// set for either WriteThrough or noncached, because
// in either case the data and any necessary zeros are
// actually written to the file.) Note that a flush of
// a user-mapped file could cause VDL to get updated the
// first time because we never had a cached write, so we
// have to be sure to update VDL here in that case as well.
//
if (DoingIoAtEof) {
//
// If we know this has gone to disk we update the Mft.
// This variable should never be set for a resident
// attribute.
//
if (UpdateMft && !FlagOn( Scb->ScbState, SCB_STATE_RESTORE_UNDERWAY )) {
ASSERTMSG( "Scb should be non-resident\n", !FlagOn( Scb->ScbState, SCB_STATE_ATTRIBUTE_RESIDENT ));
//
// We may not have the Scb.
//
if (!ScbAcquired) {
NtfsAcquireExclusiveScb( IrpContext, Scb );
ScbAcquired = TRUE;
}
//
// Start by capturing any file size changes.
//
NtfsUpdateScbFromFileObject( IrpContext, UserFileObject, Scb, FALSE );
//
// Write a log entry to update these sizes.
//
NtfsWriteFileSizes( IrpContext,
Scb,
&ByteRange,
TRUE,
TRUE );
//
// Clear the check attribute size flag.
//
ExAcquireFastMutex( Header->FastMutex );
ClearFlag( Scb->ScbState, SCB_STATE_CHECK_ATTRIBUTE_SIZE );
//
// Otherwise we set the flag indicating that we need to
// update the attribute size.
//
} else {
ExAcquireFastMutex( Header->FastMutex );
SetFlag( Scb->ScbState, SCB_STATE_CHECK_ATTRIBUTE_SIZE );
}
//
// Now is the time to update valid data length.
// The Eof condition will be freed when we commit.
//
if (ByteRange > Header->ValidDataLength.QuadPart) {
Header->ValidDataLength.QuadPart = ByteRange;
}
DoingIoAtEof = FALSE;
ExReleaseFastMutex( Header->FastMutex );
}
}
//
// Abort transaction on error by raising.
//
NtfsCleanupTransaction( IrpContext, Status, FALSE );
}
}
} finally {
DebugUnwind( NtfsCommonWrite );
if (CleanupAttributeContext) {
NtfsCleanupAttributeContext( &AttrContext );
}
if (SafeBuffer) {
NtfsFreePool( SafeBuffer );
}
//
// Now is the time to restore FileSize on errors.
// The Eof condition will be freed when we commit.
//
if (DoingIoAtEof) {
//
// Acquire the main resource to knock valid data to disk back.
//
if (!ScbAcquired) {
NtfsAcquireExclusiveScb( IrpContext, Scb );
ScbAcquired = TRUE;
}
if (Scb->ValidDataToDisk > OldFileSize) {
Scb->ValidDataToDisk = OldFileSize;
}
ExAcquireFastMutex( Header->FastMutex );
Header->FileSize.QuadPart = OldFileSize;
if (FileObject->SectionObjectPointer->SharedCacheMap != NULL) {
CcGetFileSizePointer(FileObject)->QuadPart = OldFileSize;
}
ExReleaseFastMutex( Header->FastMutex );
}
//
// If the Scb or PagingIo resource has been acquired, release it.
//
if (PagingIoResourceAcquired) {
ExReleaseResource( Header->PagingIoResource );
}
if (Irp) {
if (ScbAcquired) {
NtfsReleaseScb( IrpContext, Scb );
}
//
// Now remember to clear the WriteSeen flag if we set it. We only
// do this if there is still an Irp. It is possible for the current
// Irp to be posted or asynchronous. In that case this is a top
// level request and the cleanup happens elsewhere. For synchronous
// recursive cases the Irp will still be here.
//
if (SetWriteSeen) {
ClearFlag(IrpContext->TopLevelIrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_SEEN);
}
}
//
// Complete the request if we didn't post it and no exception
//
// Note that FatCompleteRequest does the right thing if either
// IrpContext or Irp are NULL
//
if (!AbnormalTermination()) {
if (!PostIrp) {
NtfsCompleteRequest( &IrpContext,
Irp ? &Irp : NULL,
Status );
} else if (!OplockPostIrp) {
Status = NtfsPostRequest( IrpContext, Irp );
}
}
DebugTrace( -1, Dbg, ("NtfsCommonWrite -> %08lx\n", Status) );
}
return Status;
}
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