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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)
#ifdef NTFS_RWC_DEBUG
PRWC_HISTORY_ENTRYNtfsGetHistoryEntry ( IN PSCB Scb );#endif
//
// 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) { \
PFILE_SYSTEM_STATISTICS FsStats = &(VCB)->Statistics[KeGetCurrentProcessorNumber()]; \ if (!FlagOn( (FCB)->FcbState, FCB_STATE_SYSTEM_FILE )) { \ if (NtfsIsTypeCodeUserData( (SCB)->AttributeTypeCode )) { \ FsStats->Common.UserFileWrites += 1; \ FsStats->Common.UserFileWriteBytes += (ULONG)(BYTE_COUNT); \ } else { \ FsStats->Ntfs.UserIndexWrites += 1; \ FsStats->Ntfs.UserIndexWriteBytes += (ULONG)(BYTE_COUNT); \ } \ } else { \ if ((SCB) != (VCB)->LogFileScb) { \ FsStats->Common.MetaDataWrites += 1; \ FsStats->Common.MetaDataWriteBytes += (ULONG)(BYTE_COUNT); \ } else { \ FsStats->Ntfs.LogFileWrites += 1; \ FsStats->Ntfs.LogFileWriteBytes += (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)
#ifdef SYSCACHE_DEBUG
#define CalculateSyscacheFlags( IRPCONTEXT, FLAG, INITIAL_VALUE ) \
FLAG = INITIAL_VALUE; \ if (PagingIo) { \ FLAG |= SCE_FLAG_PAGING; \ } \ if (!SynchronousIo) { \ FLAG |= SCE_FLAG_ASYNC; \ } \ if (SynchPagingIo) { \ FLAG |= SCE_FLAG_SYNC_PAGING; \ } \ if (FlagOn( (IRPCONTEXT)->State, IRP_CONTEXT_STATE_LAZY_WRITE )) { \ FLAG |= SCE_FLAG_LAZY_WRITE; \ } \ if (RecursiveWriteThrough) { \ FLAG |= SCE_FLAG_RECURSIVE; \ } \ if (NonCachedIo) { \ FLAG |= SCE_FLAG_NON_CACHED; \ } \ if (Scb->CompressionUnit) { \ FLAG |= SCE_FLAG_COMPRESSED; \ }
#endif
NTSTATUSNtfsFsdWrite ( IN PVOLUME_DEVICE_OBJECT VolumeDeviceObject, IN PIRP Irp )/*++
Routine Description:
This routine implements the FSD entry part of Write.
Arguments:
IrpContext - If present, a pointer to an IrpContext on the caller's stack.
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;
ASSERT_IRP( Irp );
DebugTrace( +1, Dbg, ("NtfsFsdWrite\n") );
//
// Call the common Write routine
//
FsRtlEnterFileSystem();
ThreadTopLevelContext = NtfsInitializeTopLevelIrp( &TopLevelContext, FALSE, FALSE );
do {
try {
//
// We are either initiating this request or retrying it.
//
if (IrpContext == NULL) {
//
// Allocate synchronous paging io on the stack to avoid allocation
// failures
//
if (CanFsdWait( Irp ) && FlagOn( Irp->Flags, IRP_PAGING_IO )) {
IrpContext = (PIRP_CONTEXT) NtfsAllocateFromStack( sizeof( IRP_CONTEXT )); }
NtfsInitializeIrpContext( Irp, CanFsdWait( Irp ), &IrpContext );
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; }
//
// Initialize the thread top level structure, if needed.
//
NtfsUpdateIrpContextWithTopLevel( IrpContext, ThreadTopLevelContext );
} 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) {
if (!FlagOn( IrpContext->MinorFunction, IRP_MN_MDL ) || FlagOn( IrpContext->MinorFunction, IRP_MN_COMPLETE )) {
IrpContext->ExceptionStatus = ExceptionCode = STATUS_SUCCESS; }
} else if ((ExceptionCode == STATUS_VOLUME_DISMOUNTED) && FlagOn( Irp->Flags, IRP_PAGING_IO )) {
IrpContext->ExceptionStatus = ExceptionCode = STATUS_SUCCESS; }
Status = NtfsProcessException( IrpContext, Irp, ExceptionCode ); }
} while ((Status == STATUS_CANT_WAIT || Status == STATUS_LOG_FILE_FULL) && (ThreadTopLevelContext == &TopLevelContext));
ASSERT( IoGetTopLevelIrp() != (PIRP) &TopLevelContext ); FsRtlExitFileSystem();
//
// And return to our caller
//
DebugTrace( -1, Dbg, ("NtfsFsdWrite -> %08lx\n", Status) );
return Status;
UNREFERENCED_PARAMETER( VolumeDeviceObject );}
NTSTATUSNtfsCommonWrite ( 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;
#ifdef COMPRESS_ON_WIRE
PCOMPRESSION_SYNC CompressionSync = NULL; PCOMPRESSED_DATA_INFO CompressedDataInfo; ULONG EngineMatches; ULONG CompressionUnitSize, ChunkSize;#endif
PNTFS_ADVANCED_FCB_HEADER Header;
BOOLEAN OplockPostIrp = FALSE; BOOLEAN PostIrp = FALSE;
PVOID SystemBuffer = NULL; PVOID SafeBuffer = NULL;
BOOLEAN RecursiveWriteThrough = FALSE; BOOLEAN ScbAcquired = FALSE; BOOLEAN PagingIoAcquired = FALSE;
BOOLEAN UpdateMft = FALSE; BOOLEAN DoingIoAtEof = FALSE; BOOLEAN SetWriteSeen = FALSE;
BOOLEAN RestoreValidDataToDisk = FALSE;
BOOLEAN Wait; BOOLEAN OriginalTopLevel; BOOLEAN PagingIo; BOOLEAN NonCachedIo; BOOLEAN SynchronousIo; ULONG PagingFileIo; BOOLEAN SynchPagingIo; BOOLEAN RawEncryptedWrite = FALSE;
NTFS_IO_CONTEXT LocalContext;
VBO StartingVbo; LONGLONG ByteCount; LONGLONG ByteRange; LONGLONG OldFileSize;
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;
LONGLONG ZeroStart; LONGLONG ZeroLength;
#ifdef SYSCACHE_DEBUG
BOOLEAN PurgeResult; LONG TempEntry;#endif
ASSERT_IRP_CONTEXT( IrpContext ); ASSERT_IRP( Irp ); ASSERT( FlagOn( IrpContext->TopLevelIrpContext->State, IRP_CONTEXT_STATE_OWNS_TOP_LEVEL ));
//
// 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 != StreamFileOpen) && (TypeOfOpen != UserVolumeOpen)) {
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 != 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; }
//
// Fail if the volume is mounted read only.
//
if (NtfsIsVolumeReadOnly( Vcb )) {
Irp->IoStatus.Information = 0;
DebugTrace( -1, Dbg, ("NtfsCommonWrite: Exit -> %08lx\n", STATUS_MEDIA_WRITE_PROTECTED) );
NtfsCompleteRequest( IrpContext, Irp, STATUS_MEDIA_WRITE_PROTECTED ); return STATUS_MEDIA_WRITE_PROTECTED; }
//
// Initialize the appropriate local variables.
//
Wait = (BOOLEAN) FlagOn( IrpContext->State, IRP_CONTEXT_STATE_WAIT ); PagingIo = BooleanFlagOn( Irp->Flags, IRP_PAGING_IO ); NonCachedIo = BooleanFlagOn( Irp->Flags,IRP_NOCACHE ); SynchronousIo = BooleanFlagOn( FileObject->Flags, FO_SYNCHRONOUS_IO ); PagingFileIo = FlagOn( Fcb->FcbState, FCB_STATE_PAGING_FILE ) && FlagOn( Scb->ScbState, SCB_STATE_UNNAMED_DATA ); SynchPagingIo = (BOOLEAN) FlagOn( Irp->Flags, IRP_SYNCHRONOUS_PAGING_IO ); OriginalTopLevel = NtfsIsTopLevelRequest( IrpContext );
//
// If this is async paging io then check if we are being called by the mapped page writer.
// Convert it back to synchronous if not.
//
if (!Wait && PagingIo && !PagingFileIo) {
if ((IrpContext->TopLevelIrpContext != IrpContext) || (NtfsGetTopLevelContext()->SavedTopLevelIrp != (PIRP) FSRTL_MOD_WRITE_TOP_LEVEL_IRP)) {
Wait = TRUE; SetFlag( IrpContext->State, IRP_CONTEXT_STATE_WAIT ); } }
DebugTrace( 0, Dbg, ("PagingIo -> %04x\n", PagingIo) ); DebugTrace( 0, Dbg, ("NonCachedIo -> %04x\n", NonCachedIo) ); DebugTrace( 0, Dbg, ("SynchronousIo -> %04x\n", SynchronousIo) );
//
// Extract starting Vbo and offset. Restore back write to eof if the
// flag was set that we came through and adjusted for it and now the filesize
// has shrunk due to a failure to adjust size or an intervening seteof
// it should be safe to add the irp params since we validated for overflows when
// we set the writing_at_eof flag
//
if (FlagOn( IrpContext->State, IRP_CONTEXT_STATE_WRITING_AT_EOF ) && (Scb->Header.FileSize.QuadPart < IrpSp->Parameters.Write.ByteOffset.QuadPart + IrpSp->Parameters.Write.Length)) {
ClearFlag( IrpContext->State, IRP_CONTEXT_STATE_WRITING_AT_EOF ); IrpSp->Parameters.Write.ByteOffset.LowPart = FILE_WRITE_TO_END_OF_FILE; IrpSp->Parameters.Write.ByteOffset.HighPart = -1; }
StartingVbo = IrpSp->Parameters.Write.ByteOffset.QuadPart; ByteCount = (LONGLONG) IrpSp->Parameters.Write.Length;
//
// Check for overflows. However, 0xFFFFFFFF is a valid value
// when we are appending at EOF.
//
ASSERT( !WriteToEof || (IrpSp->Parameters.Write.ByteOffset.HighPart == -1 && IrpSp->Parameters.Write.ByteOffset.LowPart == FILE_WRITE_TO_END_OF_FILE));
if ((MAXLONGLONG - StartingVbo < ByteCount) && (!WriteToEof)) {
ASSERT( !PagingIo );
NtfsCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER ); return STATUS_INVALID_PARAMETER; }
ByteRange = StartingVbo + ByteCount;
DebugTrace( 0, Dbg, ("StartingVbo -> %016I64x\n", StartingVbo) );
//
// If this is a null request, 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 DBG
if (PagingIo && NtfsIsTypeCodeEncryptible( Scb->AttributeTypeCode ) && Scb->Header.PagingIoResource != NULL && NtfsIsSharedScbPagingIo( Scb ) && FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_ENCRYPTED ) && Scb->EncryptionContext == NULL) {
//
// We're in trouble if we can't encrypt the data in the pages before writing
// it out. Naturally, if this is a directory or some other unencryptible
// attribute type, we don't care, since we weren't going to encrypt the data
// anyway. It is valid to do raw writes to an encypted stream without an
// encryption context, but raw encrypted writes shouldn't look like paging io.
//
ASSERTMSG( "Encrypted file without an encryption context -- can't do paging io", FALSE ); }#endif
//
// If this is async Io to a compressed stream
// then we will make this look synchronous.
//
if (FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK )) {
Wait = TRUE; SetFlag( IrpContext->State, IRP_CONTEXT_STATE_WAIT ); }
//
// See if we have to defer the write.
//
if (!PagingIo && !NonCachedIo && !FlagOn( FileObject->Flags, FO_WRITE_THROUGH ) && !CcCanIWrite( FileObject, (ULONG)ByteCount, (BOOLEAN)(FlagOn( IrpContext->State, IRP_CONTEXT_STATE_WAIT | IRP_CONTEXT_STATE_IN_FSP ) == IRP_CONTEXT_STATE_WAIT), BooleanFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_DEFERRED_WRITE))) {
BOOLEAN Retrying = BooleanFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_DEFERRED_WRITE);
NtfsPrePostIrp( IrpContext, Irp );
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_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->State, IRP_CONTEXT_STATE_ALLOC_IO_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->State, IRP_CONTEXT_STATE_ALLOC_IO_CONTEXT );
} else {
IrpContext->Union.NtfsIoContext = (PNTFS_IO_CONTEXT)ExAllocateFromNPagedLookasideList( &NtfsIoContextLookasideList ); SetFlag( IrpContext->State, IRP_CONTEXT_STATE_ALLOC_IO_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->State, IRP_CONTEXT_STATE_ALLOC_IO_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 (PagingFileIo != 0) {
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; }
//
// Special processing for paging io.
//
if (PagingIo) {
//
// If this is the Usn Journal then bias the Io to the correct location in the
// file.
//
if (FlagOn( Scb->ScbPersist, SCB_PERSIST_USN_JOURNAL )) {
StartingVbo += Vcb->UsnCacheBias; ByteRange = StartingVbo + (LONGLONG) IrpSp->Parameters.Write.Length; }
//
// Gather statistics on this IO.
//
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 this request is paging IO then check if our caller already
// owns any of the resources for this file. If so then we don't
// want to perform a log file full in this thread.
//
if (!PagingIo) {
//
// Capture the source information.
//
IrpContext->SourceInfo = Ccb->UsnSourceInfo;
//
// Check for rawencryptedwrite
//
if (NonCachedIo && !NtfsIsTopLevelNtfs( IrpContext )) {
#if DBG || defined( NTFS_FREE_ASSERT )
IrpSp = IoGetCurrentIrpStackLocation( IrpContext->TopLevelIrpContext->OriginatingIrp );
ASSERT( (IrpContext->TopLevelIrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL) && (IrpSp->Parameters.FileSystemControl.FsControlCode == FSCTL_WRITE_RAW_ENCRYPTED ));#endif
RawEncryptedWrite = TRUE; }
if (NonCachedIo && (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.
//
ExAcquireResourceExclusiveLite( Header->PagingIoResource, TRUE ); PagingIoAcquired = TRUE;
if (!FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK )) {
if (WriteToEof) { FsRtlLockFsRtlHeader( Header ); IrpContext->CleanupStructure = Scb; }
#ifdef SYSCACHE_DEBUG
if (ScbIsBeingLogged( Scb )) { ULONG Flags;
CalculateSyscacheFlags( IrpContext, Flags, SCE_FLAG_WRITE ); TempEntry = FsRtlLogSyscacheEvent( Scb, SCE_CC_FLUSH, Flags, WriteToEof ? Header->FileSize.QuadPart : StartingVbo, ByteCount, -1 ); }#endif
CcFlushCache( &Scb->NonpagedScb->SegmentObject, WriteToEof ? &Header->FileSize : (PLARGE_INTEGER)&StartingVbo, (ULONG)ByteCount, &Irp->IoStatus );
#ifdef SYSCACHE_DEBUG
if (ScbIsBeingLogged( Scb )) { FsRtlUpdateSyscacheEvent( Scb, TempEntry, Irp->IoStatus.Status, 0 ); }#endif
if (WriteToEof) { FsRtlUnlockFsRtlHeader( Header ); IrpContext->CleanupStructure = 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, FALSE );
#ifdef SYSCACHE_DEBUG
PurgeResult =#endif
CcPurgeCacheSection( &Scb->NonpagedScb->SegmentObject, (PLARGE_INTEGER)&StartingVbo, (ULONG)ByteCount, FALSE );#ifdef SYSCACHE_DEBUG
if (ScbIsBeingLogged( Scb ) && !PurgeResult) { KdPrint( ("NTFS: Failed Purge 0x%x 0x%I64x 0x%x\n", Scb, StartingVbo, ByteCount) ); DbgBreakPoint();
//
// Repeat attempt so we can watch
//
PurgeResult = CcPurgeCacheSection( &Scb->NonpagedScb->SegmentObject, (PLARGE_INTEGER)&StartingVbo, (ULONG)ByteCount, FALSE ); }#endif
}
//
// If not paging I/O, then we must acquire a resource, and do some
// other initialization. We already have the resource if we performed
// the coherency flush above.
//
} else {
// We want to acquire the paging io resource if not already acquired.
// Acquire exclusive if we failed a previous convert to non-resident because
// of a possible deadlock. Otherwise get it shared.
//
if (!(FlagOn( IrpContext->State, IRP_CONTEXT_STATE_ACQUIRE_EX ) ? ExAcquireResourceExclusiveLite( Scb->Header.PagingIoResource, Wait ) : ExAcquireSharedWaitForExclusive( Scb->Header.PagingIoResource, Wait ))) {
NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL ); } PagingIoAcquired = 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 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 ); } } //
// Now synchronize with the FsRtl Header
//
NtfsAcquireFsrtlHeader( Scb ); //
// 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) {
if ((IrpContext->TopLevelIrpContext->CleanupStructure == Fcb) || (IrpContext->TopLevelIrpContext->CleanupStructure == Scb)) {
DoingIoAtEof = TRUE; OldFileSize = Header->FileSize.QuadPart;
} else {
ASSERT( IrpContext->TopLevelIrpContext->CleanupStructure == NULL );
DoingIoAtEof = !FlagOn( Header->Flags, FSRTL_FLAG_EOF_ADVANCE_ACTIVE ) || NtfsWaitForIoAtEof( Header, (PLARGE_INTEGER)&StartingVbo, (ULONG)ByteCount );
//
// Set the Flag if we are changing FileSize or ValidDataLength,
// and save current values.
//
if (DoingIoAtEof) {
SetFlag( Header->Flags, FSRTL_FLAG_EOF_ADVANCE_ACTIVE ); #if (DBG || defined( NTFS_FREE_ASSERTS ))
((PSCB) Header)->IoAtEofThread = (PERESOURCE_THREAD) ExGetCurrentResourceThread(); #endif
//
// Store this in the IrpContext until commit or post
//
IrpContext->CleanupStructure = 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) {
//
// Mark the in irp context that the write is at eof and change its paramters
// to reflect where the end of the file is.
//
SetFlag( IrpContext->State, IRP_CONTEXT_STATE_WRITING_AT_EOF ); IrpSp->Parameters.Write.ByteOffset.QuadPart = Header->FileSize.QuadPart;
StartingVbo = Header->FileSize.QuadPart; ByteRange = StartingVbo + ByteCount;
//
// If the ByteRange now exceeds our maximum value, then
// return an error.
//
if (ByteRange < StartingVbo) {
NtfsReleaseFsrtlHeader( Scb ); try_return( Status = STATUS_INVALID_PARAMETER ); } }
#if (DBG || defined( NTFS_FREE_ASSERTS ))
} else {
ASSERT( ((PSCB) Header)->IoAtEofThread != (PERESOURCE_THREAD) ExGetCurrentResourceThread() ); #endif
}
}
//
// Make sure the user isn't writing past our maximum file size.
//
if ((ULONGLONG)ByteRange > MAXFILESIZE) {
NtfsReleaseFsrtlHeader( Scb ); try_return( Status = STATUS_INVALID_PARAMETER ); } }
NtfsReleaseFsrtlHeader( Scb ); //
// 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 (FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK ) && 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->CleanupStructure = Scb; }
NtfsCreateInternalAttributeStream( IrpContext, Scb, FALSE, NULL );
if (!DoingIoAtEof) { FsRtlUnlockFsRtlHeader( Header ); IrpContext->CleanupStructure = NULL; } }
FileObject = Scb->FileObject; SetFlag( FileObject->Flags, FO_WRITE_THROUGH ); SetFlag( IrpContext->State, IRP_CONTEXT_STATE_WRITE_THROUGH ); }
//
// If this is async I/O save away the async resource.
//
if (!Wait && NonCachedIo) {
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 post any Usn changes. We will blindly make the call here, because
// usually all but the first call is in the fast path anyway.
// Checkpoint the transaction to reduce resource contention of the UsnJournal
// and Mft.
//
if (FlagOn( Vcb->VcbState, VCB_STATE_USN_JOURNAL_ACTIVE )) {
ULONG Reason = 0;
ASSERT( Vcb->UsnJournal != NULL );
if (ByteRange > Header->FileSize.QuadPart) { Reason |= USN_REASON_DATA_EXTEND; } if (StartingVbo < Header->FileSize.QuadPart) { Reason |= USN_REASON_DATA_OVERWRITE; }
NtfsPostUsnChange( IrpContext, Scb, Reason ); if (IrpContext->TransactionId != 0) { NtfsCheckpointCurrentTransaction( IrpContext ); } }
} else {
//
// Only do the check if we are the top-level Ntfs case. In any
// recursive Ntfs case we don't perform a log-file full.
//
if (NtfsIsTopLevelRequest( IrpContext )) {
if (NtfsIsSharedScb( Scb ) || ((Scb->Header.PagingIoResource != NULL) && NtfsIsSharedScbPagingIo( Scb ))) {
//
// Don't try to do a clean checkpoint in this thread.
//
NtfsGetTopLevelContext()->TopLevelRequest = FALSE; } }
//
// 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) && !NtfsIsSharedScbPagingIo( (PSCB) Header ) && !NtfsIsSharedScb( (PSCB) Header ) ) {
ExAcquireSharedStarveExclusive( Header->PagingIoResource, TRUE ); PagingIoAcquired = 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 this is async paging IO to a compressed file force it to be
// synchronous.
//
if (!Wait && (Scb->CompressionUnit != 0)) {
if (FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK )) {
Wait = TRUE; SetFlag( IrpContext->State, IRP_CONTEXT_STATE_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->State, IRP_CONTEXT_STATE_ALLOC_IO_CONTEXT );
KeInitializeEvent( &IrpContext->Union.NtfsIoContext->Wait.SyncEvent, NotificationEvent, FALSE );
} }
//
// 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") ); SetFlag( IrpContext->State, IRP_CONTEXT_STATE_LAZY_WRITE );
//
// 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->State, IRP_CONTEXT_STATE_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 could be someone who extends valid data or valid data to disk,
// like the Mapped Page Writer or a flush or the lazy writer
// writing the last page contianing the VDL, so we have to
// duplicate code from above in the non paging case 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 (!RecursiveWriteThrough) {
if (!FlagOn(Scb->ScbState, SCB_STATE_MODIFIED_NO_WRITE)) {
ASSERT(!WriteToEof);
//
// Now synchronize with the FsRtl Header
//
NtfsAcquireFsrtlHeader( Scb );
//
// 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->CleanupStructure == Fcb) || (IrpContext->TopLevelIrpContext->CleanupStructure == 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 or deref seg thread on IoAtEof. // We also won't block on non-top level requests that are not recursing from the filesystem like the deref
// seg thread. Mm initiated flushes are originally not top level but the top level
// irp context is the current irp context. (as opposed to recursive file system writes
// which are not top level and top level irp context is different from the current one)
if (FlagOn( Header->Flags, FSRTL_FLAG_EOF_ADVANCE_ACTIVE )) {
if (!OriginalTopLevel && NtfsIsTopLevelNtfs( IrpContext )) {
NtfsReleaseFsrtlHeader( Scb ); try_return( Status = STATUS_FILE_LOCK_CONFLICT ); }
DoingIoAtEof = NtfsWaitForIoAtEof( Header, (PLARGE_INTEGER)&StartingVbo, (ULONG)ByteCount );
} 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 ); #if (DBG || defined( NTFS_FREE_ASSERTS ))
((PSCB) Header)->IoAtEofThread = (PERESOURCE_THREAD) ExGetCurrentResourceThread();#endif
//
// Store this in the IrpContext until commit or post
//
IrpContext->CleanupStructure = Scb;
OldFileSize = Header->FileSize.QuadPart;#if (DBG || defined( NTFS_FREE_ASSERTS ))
} else {
ASSERT( ((PSCB) Header)->IoAtEofThread != (PERESOURCE_THREAD) ExGetCurrentResourceThread() );#endif
} }
} NtfsReleaseFsrtlHeader( Scb ); }
//
// Now that we're synchronized with doing io at eof we can check
// the lazywrite's bounds
//
if (FlagOn( IrpContext->State, IRP_CONTEXT_STATE_LAZY_WRITE )) {
//
// The lazy writer should always be writing data ends on
// or before the page containing ValidDataLength.
// In some cases the lazy writer may be writing beyond this point.
//
// 1. The user may have truncated the size to zero through
// SetAllocation but the page was already queued to the lazy
// writer. In the typical case this write will be nooped
//
// 2. If there is a mapped section and the user actually modified
// the page in which VDL is contained but beyond VDL this page is written to disk
// and VDL is updated. Otherwise it may never get written since the mapped writer
// defers to the lazywriter
//
// 3. For all writes really beyond the page containing VDL when
// the file is mapped since ValidDataLength is notupdated here a
// subsequent write may zero this range and the data would be lost. So
// We will return FILE_LOCK_CONFLICT to lazy writer if there is a mapped section and wait
// for the mapped page writer to write this page (or any
// page beyond this point).
//
// Returning FILE_LOCK_CONFLICT should never cause us to lose
// the data so we can err on the conservative side here.
// There is nothing to worry about unless the file has been
// mapped.
//
if (FlagOn( Header->Flags, FSRTL_FLAG_USER_MAPPED_FILE )) { //
// Fail if the start of this request is beyond valid data length.
// Don't worry if this is an unsafe test. MM and CC won't
// throw this page away if it is really dirty.
//
if ((ByteRange > Header->ValidDataLength.QuadPart) && (StartingVbo < Header->FileSize.QuadPart)) { //
// It's OK if byte range is within the page containing valid data length.
//
if (ByteRange > ((Header->ValidDataLength.QuadPart + PAGE_SIZE - 1) & ~((LONGLONG) (PAGE_SIZE - 1)))) { //
// Don't flush this now.
//
try_return( Status = STATUS_FILE_LOCK_CONFLICT ); } } //
// This is a stale callback by cc we can discard the data
// this usually indicates a failed purge at some point during a truncate
//
} else if (ByteRange >= Header->ValidDataLength.QuadPart) {
//
// Trim the write down
//
ByteRange = Header->ValidDataLength.QuadPart; ByteCount = ByteRange - StartingVbo;
//
// If all of the write is beyond vdl just noop it
//
if (StartingVbo >= Header->ValidDataLength.QuadPart) { DoingIoAtEof = FALSE; Irp->IoStatus.Information = 0; try_return( Status = STATUS_SUCCESS ); } } } // lazy writer
} // not recursive write through
//
// 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, =><=.
//
NtfsAcquireFsrtlHeader( Scb ); 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!
// We also haven't really written anything so set doingioateof back to
// false
//
ByteRange = Header->ValidDataLength.QuadPart; DoingIoAtEof = FALSE;
NtfsReleaseFsrtlHeader( Scb );
try_return( Status = STATUS_SUCCESS );
} else {
DebugTrace( 0, Dbg, ("PagingIo extending beyond EOF.\n") );
#ifdef NTFS_RWC_DEBUG
if ((FileObject->SectionObjectPointer != &Scb->NonpagedScb->SegmentObject) && (StartingVbo < NtfsRWCHighThreshold) && (ByteRange > NtfsRWCLowThreshold)) {
PRWC_HISTORY_ENTRY NextBuffer;
NextBuffer = NtfsGetHistoryEntry( Scb );
NextBuffer->Operation = TrimCompressedWrite; NextBuffer->Information = Scb->Header.FileSize.LowPart; NextBuffer->FileOffset = (ULONG) StartingVbo; NextBuffer->Length = (ULONG) ByteRange; }#endif
ByteCount = Header->FileSize.QuadPart - StartingVbo; ByteRange = Header->FileSize.QuadPart; } }
NtfsReleaseFsrtlHeader( Scb );
//
// If there is a user-mapped file and a Usn Journal, then try to post a change.
// Checkpoint the transaction to reduce resource contention of the UsnJournal
// and Mft.
//
if (FlagOn(Header->Flags, FSRTL_FLAG_USER_MAPPED_FILE) && FlagOn( Vcb->VcbState, VCB_STATE_USN_JOURNAL_ACTIVE )) {
ASSERT( Vcb->UsnJournal != NULL );
NtfsPostUsnChange( IrpContext, Scb, USN_REASON_DATA_OVERWRITE ); if (IrpContext->TransactionId != 0) { NtfsCheckpointCurrentTransaction( IrpContext ); } } }
ASSERT( PagingIo || FileObject->WriteAccess || RawEncryptedWrite ); ASSERT( !(PagingIo && RawEncryptedWrite) );
//
// 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 != $INDEX_ALLOCATION) {
DebugTrace( 0, Dbg, ("Initializing Scb -> %08lx\n", Scb) );
//
// Acquire and drop the Scb when doing this.
//
// Make sure we don't have any Mft records.
//
NtfsPurgeFileRecordCache( IrpContext );
NtfsAcquireResourceShared( IrpContext, Scb, TRUE ); ScbAcquired = TRUE; NtfsUpdateScbFromAttribute( IrpContext, Scb, NULL );
NtfsReleaseResource( IrpContext, Scb ); ScbAcquired = FALSE;
} else {
ASSERT( Header->ValidDataLength.QuadPart == Li0.QuadPart ); } }
//
// We assert that Paging Io writes will never WriteToEof.
//
ASSERT( !WriteToEof || !PagingIo );
//
// We assert that we never get a non-cached io call for a non-$DATA,
// resident attribute.
//
ASSERTMSG( "Non-cached I/O call on resident system attribute\n", NtfsIsTypeCodeUserData( Scb->AttributeTypeCode ) || NtfsIsTypeCodeLoggedUtilityStream( 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->State, IRP_CONTEXT_STATE_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->State, IRP_CONTEXT_STATE_ALLOC_IO_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 (FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK )) {
Wait = TRUE; SetFlag( IrpContext->State, IRP_CONTEXT_STATE_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.
//
// Make sure we don't have any Mft records.
//
NtfsPurgeFileRecordCache( IrpContext );
NtfsAcquireResourceShared( IrpContext, Scb, TRUE ); ScbAcquired = TRUE; NtfsUpdateScbFromAttribute( IrpContext, Scb, NULL );
NtfsReleaseResource( IrpContext, Scb ); 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 ((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 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 && !FlagOn( IrpContext->State, IRP_CONTEXT_STATE_LAZY_WRITE )) {
//
// 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;
NtfsMungeScbSnapshot( IrpContext, Scb, OldFileSize );
//
// 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.
//
//
// We must have the paging Io resource exclusive to prevent a
// collided page wait while doing the convert to non-resident.
//
if (!PagingIo && !FlagOn( IrpContext->State, IRP_CONTEXT_STATE_ACQUIRE_EX ) && (Scb->Header.PagingIoResource != NULL)) {
SetFlag( IrpContext->State, IRP_CONTEXT_STATE_ACQUIRE_EX ); NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL ); }
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( IrpContext, &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 > Scb->Header.AllocationSize.QuadPart) {
BOOLEAN AskForMore = TRUE;
//
// Assume we start allocating from the current allocation size unless we're
// sparse in which case we'll allocate from the starting compression unit if
// its beyond vdl
//
if (!FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_SPARSE ) || (BlockAlignTruncate( StartingVbo, (LONG)Scb->CompressionUnit) <= Scb->Header.ValidDataLength.QuadPart )) { LlTemp1 = Scb->Header.AllocationSize.QuadPart; } else { LlTemp1 = BlockAlignTruncate( StartingVbo, (LONG)Scb->CompressionUnit ); }
//
// If we are not writing compressed then we may need to allocate precisely.
// This includes the uncompressed sparse file case
//
if (!FlagOn( Scb->ScbState, SCB_STATE_WRITE_COMPRESSED )) {
//
// If there is a compression unit then we could be in the process of
// decompressing. Allocate precisely in this case because we don't
// want to leave any holes. Specifically the user may have truncated
// the file and is now regenerating it yet the clear compression operation
// has already passed this point in the file (and dropped all resources).
// No one will go back to cleanup the allocation if we leave a hole now.
//
if (Scb->CompressionUnit != 0) {
LlTemp2 = ByteRange + Scb->CompressionUnit - 1; ((PLARGE_INTEGER) &LlTemp2)->LowPart &= ~(Scb->CompressionUnit - 1); LlTemp2 -= LlTemp1; AskForMore = FALSE;
//
// Allocate through ByteRange.
//
} else {
LlTemp2 = ByteRange - LlTemp1; }
//
// 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.
//
} else {
if ((StartingVbo - Header->ValidDataLength.QuadPart) > (LONGLONG) (Scb->CompressionUnit * 2)) {
ASSERT( FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK ));
LlTemp1 = StartingVbo; ((PLARGE_INTEGER) &LlTemp1)->LowPart &= ~(Scb->CompressionUnit - 1); }
//
// Allocate to the end of ByteRange.
//
LlTemp2 = ByteRange - LlTemp1; }
//
//
// This will add the allocation and modify the allocation
// size in the Scb.
//
NtfsAddAllocation( IrpContext, FileObject, Scb, LlClustersFromBytesTruncate( Vcb, LlTemp1 ), LlClustersFromBytes( Vcb, LlTemp2 ), AskForMore, Ccb );
//
// Assert that the allocation worked
//
ASSERT( Header->AllocationSize.QuadPart >= ByteRange || (Scb->CompressionUnit != 0));
SetFlag(Scb->ScbState, SCB_STATE_TRUNCATE_ON_CLOSE);
//
// If this is a sparse file lets pad the allocation by adding a
// hole at the end of the allocation. This will let us utilize
// the fast IO path.
//
if (FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_SPARSE )) {
LlTemp2 = Int64ShllMod32( LlTemp2, 3 );
if (MAXFILESIZE - Header->AllocationSize.QuadPart > LlTemp2) {
NtfsAddSparseAllocation( IrpContext, FileObject, Scb, Header->AllocationSize.QuadPart, LlTemp2 ); } } }
//
// 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 );
//
// Make sure we purge the file record cache as well. Otherwise
// a purge of the Mft may fail in a different thread which owns a resource
// this thread needs later.
//
NtfsPurgeFileRecordCache( 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 )); }
ClearFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_RELEASE_USN_JRNL | IRP_CONTEXT_FLAG_RELEASE_MFT );
//
// Go through and free any Scb's in the queue of shared
// Scb's for transactions.
//
if (IrpContext->SharedScb != NULL) {
NtfsReleaseSharedResources( IrpContext ); }
ScbAcquired = FALSE; }
//
// Now synchronize with the FsRtl Header and set FileSize
// now so that our reads will not get truncated.
//
NtfsAcquireFsrtlHeader( Scb ); if (ByteRange > Header->FileSize.QuadPart) { ASSERT( ByteRange <= Header->AllocationSize.QuadPart ); Header->FileSize.QuadPart = ByteRange; SetFlag( UserFileObject->Flags, FO_FILE_SIZE_CHANGED ); } NtfsReleaseFsrtlHeader( Scb ); }
//
// 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; }
//
// Make sure we don't have any Mft records.
//
NtfsPurgeFileRecordCache( IrpContext ); NtfsAcquireExclusiveScb( IrpContext, Scb ); ScbAcquired = TRUE;
//
// 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) );
//
// Unlike the other cases, we're already holding the Scb, so
// there's no need to acquire & drop it around the Update call.
//
NtfsUpdateScbFromAttribute( IrpContext, Scb, NULL );
//
// Make sure we purge the file record cache as well. Otherwise
// a purge of the Mft may fail in a different thread which owns a resource
// this thread needs later.
//
NtfsPurgeFileRecordCache( IrpContext ); }
NtfsMungeScbSnapshot( IrpContext, Scb, OldFileSize );
//
// 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 ); }
//
// Make sure the cache FileSizes are updated if this is not paging I/O.
//
if (!PagingIo && DoingIoAtEof) { NtfsSetBothCacheSizes( FileObject, (PCC_FILE_SIZES)&Header->AllocationSize, Scb ); }
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;
//
// Make sure the cache FileSizes are updated if this is not paging I/O.
//
if (!PagingIo && DoingIoAtEof) { NtfsSetBothCacheSizes( FileObject, (PCC_FILE_SIZES)&Header->AllocationSize, Scb ); }
//
// 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 (!FlagOn( IrpContext->State, IRP_CONTEXT_STATE_LAZY_WRITE )) {
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 is a write to an encrypted file then make it synchronous. We
// need to do this so that the encryption driver has a thread to run in.
//
if ((Scb->EncryptionContext != NULL) && !FlagOn( IrpContext->State, IRP_CONTEXT_STATE_WAIT ) && (NtfsData.EncryptionCallBackTable.BeforeWriteProcess != NULL) && NtfsIsTypeCodeUserData( Scb->AttributeTypeCode )) {
Wait = TRUE; SetFlag( IrpContext->State, IRP_CONTEXT_STATE_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->State, IRP_CONTEXT_STATE_ALLOC_IO_CONTEXT );
KeInitializeEvent( &IrpContext->Union.NtfsIoContext->Wait.SyncEvent, NotificationEvent, FALSE ); }
//
// 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 (Header->ValidDataLength.QuadPart > Scb->ValidDataToDisk) { LlTemp1 = Header->ValidDataLength.QuadPart; } else {
//
// This can only occur for compressed files
//
LlTemp1 = Scb->ValidDataToDisk; }
if (!FlagOn( IrpContext->State, IRP_CONTEXT_STATE_LAZY_WRITE ) && !RecursiveWriteThrough && (StartingVbo > LlTemp1)) {
#ifdef SYSCACHE_DEBUG
if (ScbIsBeingLogged( Scb )) { ULONG Flags;
CalculateSyscacheFlags( IrpContext, Flags, SCE_FLAG_WRITE ); TempEntry = FsRtlLogSyscacheEvent( Scb, SCE_ZERO_NC, Flags, LlTemp1, StartingVbo - LlTemp1, 0); }#endif
if (!NtfsZeroData( IrpContext, Scb, FileObject, LlTemp1, StartingVbo - LlTemp1, &OldFileSize )) {#ifdef SYSCACHE_DEBUG
if (ScbIsBeingLogged( Scb )) { FsRtlUpdateSyscacheEvent( Scb, TempEntry, Header->ValidDataLength.QuadPart, 0 ); }#endif
NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL ); }
#ifdef SYSCACHE_DEBUG
if (ScbIsBeingLogged( Scb )) { FsRtlUpdateSyscacheEvent( Scb, TempEntry, Header->ValidDataLength.QuadPart, 0 ); }#endif
}
//
// 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. Don't do this if we detected a problem
// with the Mft when analyzing the first file records. We
// can use the presence of the version number in the Vcb
// to tell us this.
//
if ((Scb == Vcb->MftScb) && (StartingVbo < Vcb->Mft2Scb->Header.FileSize.QuadPart) && (Vcb->MajorVersion != 0)) {
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, RESERVED_BUFFER_ONE_NEEDED, &TempLength, &NewMdl, &NewBuffer );
//
// Now transform and write out the original stream.
//
RtlCopyMemory( NewBuffer, SystemBuffer, BytesToWrite );
//
// We copy our Mdl into the Irp and then perform the Io.
//
Irp->MdlAddress = NewMdl; Irp->UserBuffer = NewBuffer;
//
// Now increment the sequence number in both the original
// and copied buffer, and transform the copied buffer.
// If this is the LogFile then adjust the range of the transform.
//
if ((PAGE_SIZE != LFS_DEFAULT_LOG_PAGE_SIZE) && (Scb == Vcb->LogFileScb)) {
LONGLONG LfsFileOffset; ULONG LfsLength; ULONG LfsBias;
LfsFileOffset = StartingVbo; LfsLength = BytesToWrite;
LfsCheckWriteRange( &Vcb->LfsWriteData, &LfsFileOffset, &LfsLength ); LfsBias = (ULONG) (LfsFileOffset - StartingVbo);
NtfsTransformUsaBlock( Scb, Add2Ptr( SystemBuffer, LfsBias ), Add2Ptr( NewBuffer, LfsBias ), LfsLength );
} else {
NtfsTransformUsaBlock( Scb, SystemBuffer, NewBuffer, BytesToWrite ); }
ASSERT( Wait ); NtfsNonCachedIo( IrpContext, Irp, Scb, StartingVbo, BytesToWrite, 0 );
} 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 {
ULONG StreamFlags = 0;
//
// If the file has an UpdateLsn, then flush the log file before
// allowing the data to go out. The UpdateLsn is synchronized
// with the FcbLock. However, since we are in the process of
// doing a write, if we see a 0 in our unsafe test, it is ok
// to procede without an LfsFlush.
//
if (Fcb->UpdateLsn.QuadPart != 0) {
LSN UpdateLsn;
NtfsLockFcb( IrpContext, Fcb ); UpdateLsn = Fcb->UpdateLsn; Fcb->UpdateLsn.QuadPart = 0; NtfsUnlockFcb( IrpContext, Fcb ); LfsFlushToLsn( Vcb->LogHandle, UpdateLsn ); }
//
// Remember that from this point on we need to restore ValidDataToDisk.
// (Doing so earlier can get us into deadlocks if we hit the finally
// clause holding the Mft & UsnJournal.)
//
if (FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK )) { RestoreValidDataToDisk = TRUE; }
//
// Let's decide if there's anything special we need to tell NonCachedIo
// about this stream and how we're accessing it.
//
if (FileObject->SectionObjectPointer != &Scb->NonpagedScb->SegmentObject) {
SetFlag( StreamFlags, COMPRESSED_STREAM ); }
if (RawEncryptedWrite) {
SetFlag( StreamFlags, ENCRYPTED_STREAM ); }
#ifdef NTFS_RWC_DEBUG
if (FlagOn( StreamFlags, COMPRESSED_STREAM )) {
if ((StartingVbo < NtfsRWCHighThreshold) && (StartingVbo + BytesToWrite > NtfsRWCLowThreshold)) {
PRWC_HISTORY_ENTRY NextBuffer;
NextBuffer = NtfsGetHistoryEntry( Scb );
NextBuffer->Operation = WriteCompressed; NextBuffer->Information = 0; NextBuffer->FileOffset = (ULONG) StartingVbo; NextBuffer->Length = (ULONG) BytesToWrite; } }#endif
Status = NtfsNonCachedIo( IrpContext, Irp, Scb, StartingVbo, BytesToWrite, StreamFlags );
#ifdef SYSCACHE_DEBUG
if (ScbIsBeingLogged( Scb )) { ULONG Flags;
CalculateSyscacheFlags( IrpContext, Flags, SCE_FLAG_WRITE ); FsRtlLogSyscacheEvent( Scb, SCE_WRITE, Flags, StartingVbo, BytesToWrite, Status ); }#endif
#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 this attribute is encrypted, we can't verify the data
// right now, since it has already been encrypted.
//
if (FlagOn(Scb->ScbState, SCB_STATE_SYSCACHE_FILE) &&// !FlagOn(Scb->AttributeFlags, ATTRIBUTE_FLAG_ENCRYPTED) &&
NtfsIsTypeCodeUserData(Scb->AttributeTypeCode)) {
PSYSCACHE_EVENT SyscacheEvent;
FsRtlVerifySyscacheData( FileObject, MmGetSystemAddressForMdlSafe( Irp->MdlAddress, NormalPagePriority ), BytesToWrite, (ULONG)StartingVbo );
SyscacheEvent = NtfsAllocatePool( PagedPool, sizeof( SYSCACHE_EVENT ) );
if (FlagOn( Irp->Flags, IRP_PAGING_IO )) {
SyscacheEvent->EventTypeCode = SYSCACHE_PAGING_WRITE;
} else {
SyscacheEvent->EventTypeCode = SYSCACHE_NORMAL_WRITE; }
SyscacheEvent->Data1 = StartingVbo; SyscacheEvent->Data2 = (LONGLONG) BytesToWrite;
InsertTailList( &Scb->ScbType.Data.SyscacheEventList, &SyscacheEvent->EventList ); }
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; PagingIoAcquired = FALSE; Irp = NULL;
try_return( Status ); } }
//
// 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 );
//
// Remember if we need to update the Mft.
//
if (!FlagOn( Scb->ScbState, SCB_STATE_ATTRIBUTE_RESIDENT )) {
UpdateMft = BooleanFlagOn(IrpContext->State, IRP_CONTEXT_STATE_WRITE_THROUGH); }
//
// If this write is beyond (valid data length / valid data to disk), then we
// must zero the data in between. Only compressed files have a nonzero VDD
//
if (Header->ValidDataLength.QuadPart > Scb->ValidDataToDisk) { ZeroStart = Header->ValidDataLength.QuadPart; } else { ZeroStart = Scb->ValidDataToDisk; } ZeroLength = StartingVbo - ZeroStart;
//
// 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. Don't cache the normal
// stream unless we need to.
//
if ((FileObject->PrivateCacheMap == NULL)
&&
!FlagOn(IrpContext->MinorFunction, IRP_MN_COMPRESSED) || (ZeroLength > 0)) {
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->CleanupStructure = Scb; }
CcInitializeCacheMap( FileObject, (PCC_FILE_SIZES)&Header->AllocationSize, FALSE, &NtfsData.CacheManagerCallbacks, Scb );
if (!DoingIoAtEof) { FsRtlUnlockFsRtlHeader( Header ); IrpContext->CleanupStructure = NULL; }
CcSetReadAheadGranularity( FileObject, READ_AHEAD_GRANULARITY ); }
//
// Make sure the cache FileSizes are updated.
//
if (DoingIoAtEof) { NtfsSetBothCacheSizes( FileObject, (PCC_FILE_SIZES)&Header->AllocationSize, Scb ); }
if (ZeroLength > 0) {
//
// If the caller is writing zeros way beyond ValidDataLength,
// then noop it. We need to wrap the compare in a try-except
// to protect ourselves from an invalid user buffer.
//
if ((ZeroLength > PAGE_SIZE) && (ByteCount <= sizeof( LARGE_INTEGER ))) {
ULONG Zeroes;
try {
Zeroes = RtlEqualMemory( NtfsMapUserBuffer( Irp ), &Li0, (ULONG)ByteCount );
} except( EXCEPTION_EXECUTE_HANDLER ) {
try_return( Status = STATUS_INVALID_USER_BUFFER ); }
if (Zeroes) {
ByteRange = Header->ValidDataLength.QuadPart; Irp->IoStatus.Information = (ULONG)ByteCount; try_return( Status = STATUS_SUCCESS ); } }
//
// Call the Cache Manager to zero the data.
//
#ifdef SYSCACHE_DEBUG
if (ScbIsBeingLogged( Scb )) { ULONG Flags;
CalculateSyscacheFlags( IrpContext, Flags, SCE_FLAG_WRITE ); TempEntry = FsRtlLogSyscacheEvent( Scb, SCE_ZERO_C, Flags, ZeroStart, ZeroLength, StartingVbo ); }#endif
if (!NtfsZeroData( IrpContext, Scb, FileObject, ZeroStart, ZeroLength, &OldFileSize )) {#ifdef SYSCACHE_DEBUG
if (ScbIsBeingLogged( Scb )) { FsRtlUpdateSyscacheEvent( Scb, TempEntry, Header->ValidDataLength.QuadPart, SCE_FLAG_CANT_WAIT ); }#endif
NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL ); } }
//
// For a compressed stream, we must first reserve the space.
//
if ((Scb->CompressionUnit != 0) && !FlagOn(Scb->ScbState, SCB_STATE_REALLOCATE_ON_WRITE) && !NtfsReserveClusters(IrpContext, Scb, StartingVbo, (ULONG)ByteCount)) {
//
// If the file is only sparse and is fully allocated then there is no
// reason to reserve.
//
if (!FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK ) && !FlagOn( Scb->ScbState, SCB_STATE_ATTRIBUTE_RESIDENT )) {
VCN CurrentVcn; LCN CurrentLcn; ULONGLONG RemainingClusters; ULONGLONG CurrentClusters;
CurrentVcn = LlClustersFromBytesTruncate( Vcb, StartingVbo ); RemainingClusters = LlClustersFromBytes( Vcb, StartingVbo + ByteCount );
while (NtfsLookupAllocation( IrpContext, Scb, CurrentVcn, &CurrentLcn, &CurrentClusters, NULL, NULL )) {
if (CurrentClusters >= RemainingClusters) {
RemainingClusters = 0; break; }
CurrentVcn += CurrentClusters; RemainingClusters -= CurrentClusters; }
if (RemainingClusters != 0) {
NtfsRaiseStatus( IrpContext, STATUS_DISK_FULL, NULL, NULL ); }
} else {
NtfsRaiseStatus( IrpContext, STATUS_DISK_FULL, NULL, NULL ); } }
//
// We need to go through the cache for this
// file object. First handle the noncompressed calls.
//
if (!FlagOn(IrpContext->MinorFunction, IRP_MN_COMPRESSED)) {
//
// If there is a compressed section, we have to do cache coherency for
// that stream, and loop here to do a Cache Manager view at a time.
//
#ifdef COMPRESS_ON_WIRE
if (Scb->NonpagedScb->SegmentObjectC.DataSectionObject != NULL) {
LONGLONG LocalOffset = StartingVbo; ULONG LocalLength; ULONG LengthLeft = (ULONG)ByteCount;
//
// Create the compressed stream if not there.
//
if (Header->FileObjectC == NULL) { NtfsCreateInternalCompressedStream( IrpContext, Scb, FALSE, NULL ); }
if (!FlagOn(IrpContext->MinorFunction, IRP_MN_MDL)) {
//
// Get hold of the user's buffer.
//
SystemBuffer = NtfsMapUserBuffer( Irp ); }
//
// We must loop to do a view at a time, because that is how much
// we synchronize at once below.
//
do {
//
// Calculate length left in view.
//
LocalLength = (ULONG)LengthLeft; if (LocalLength > (ULONG)(VACB_MAPPING_GRANULARITY - (LocalOffset & (VACB_MAPPING_GRANULARITY - 1)))) { LocalLength = (ULONG)(VACB_MAPPING_GRANULARITY - (LocalOffset & (VACB_MAPPING_GRANULARITY - 1))); }
//
// Synchronize the current view.
//
Status = NtfsSynchronizeUncompressedIo( Scb, &LocalOffset, LocalLength, TRUE, &CompressionSync );
//
// If we successfully synchronized, then do a piece of the transfer.
//
if (NT_SUCCESS(Status)) {
if (!FlagOn(IrpContext->MinorFunction, IRP_MN_MDL)) {
DebugTrace( 0, Dbg, ("Cached write.\n") );
//
// Do the write, possibly writing through
//
// Make sure we don't have any Mft records.
//
NtfsPurgeFileRecordCache( IrpContext );
if (!CcCopyWrite( FileObject, (PLARGE_INTEGER)&LocalOffset, LocalLength, (BOOLEAN) FlagOn( IrpContext->State, IRP_CONTEXT_STATE_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;
SystemBuffer = Add2Ptr( SystemBuffer, LocalLength );
} else {
//
// DO AN MDL WRITE
//
DebugTrace( 0, Dbg, ("MDL write.\n") );
ASSERT( FlagOn(IrpContext->State, IRP_CONTEXT_STATE_WAIT) );
//
// If we got this far and then hit a log file full the Mdl will
// already be present.
//
ASSERT((Irp->MdlAddress == NULL) || (LocalOffset != StartingVbo));
#ifdef NTFS_RWCMP_TRACE
if (NtfsCompressionTrace && IsSyscache(Header)) { DbgPrint("CcMdlWrite: FO = %08lx, Len = %08lx\n", (ULONG)LocalOffset, LocalLength ); }#endif
CcPrepareMdlWrite( FileObject, (PLARGE_INTEGER)&LocalOffset, LocalLength, &Irp->MdlAddress, &Irp->IoStatus ); }
Status = Irp->IoStatus.Status;
LocalOffset += LocalLength; LengthLeft -= LocalLength; }
} while ((LengthLeft != 0) && NT_SUCCESS(Status));
if (NT_SUCCESS(Status)) { Irp->IoStatus.Information = (ULONG)ByteCount; }
try_return( Status ); }#endif
//
// 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
//
// Make sure we don't have any Mft records.
//
NtfsPurgeFileRecordCache( IrpContext );
if (!CcCopyWrite( FileObject, (PLARGE_INTEGER)&StartingVbo, (ULONG)ByteCount, (BOOLEAN) FlagOn( IrpContext->State, IRP_CONTEXT_STATE_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->State, IRP_CONTEXT_STATE_WAIT) );
//
// If we got this far and then hit a log file full the Mdl will
// already be present.
//
ASSERT(Irp->MdlAddress == NULL);
#ifdef NTFS_RWCMP_TRACE
if (NtfsCompressionTrace && IsSyscache(Header)) { DbgPrint("CcMdlWrite: FO = %08lx, Len = %08lx\n", (ULONG)StartingVbo, (ULONG)ByteCount ); }#endif
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.
//
} else {
#ifdef COMPRESS_ON_WIRE
ASSERT((StartingVbo & (NTFS_CHUNK_SIZE - 1)) == 0);
//
// Get out if COW is not supported.
//
if (!NtfsEnableCompressedIO) {
NtfsRaiseStatus( IrpContext, STATUS_UNSUPPORTED_COMPRESSION, NULL, NULL ); }
if ((Header->FileObjectC == NULL) || (Header->FileObjectC->PrivateCacheMap == NULL)) {
//
// Don't do compressed IO on a stream which is changing its
// compression state.
//
if (FlagOn( Scb->ScbState, SCB_STATE_REALLOCATE_ON_WRITE )) {
NtfsRaiseStatus( IrpContext, STATUS_UNSUPPORTED_COMPRESSION, NULL, NULL ); }
//
// Make sure we are serialized with the FileSizes, and
// will remove this condition if we abort.
//
if (!DoingIoAtEof) { FsRtlLockFsRtlHeader( Header ); IrpContext->CleanupStructure = Scb; }
NtfsCreateInternalCompressedStream( IrpContext, Scb, FALSE, NULL );
if (!DoingIoAtEof) { FsRtlUnlockFsRtlHeader( Header ); IrpContext->CleanupStructure = NULL; } }
//
// Make sure the cache FileSizes are updated.
//
if (DoingIoAtEof) { NtfsSetBothCacheSizes( FileObject, (PCC_FILE_SIZES)&Header->AllocationSize, Scb ); }
//
// 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 = Scb->CompressionUnit; 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->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, Scb->CompressionUnit, NTFS_CHUNK_SIZE, EngineMatches );
//
// On successful Mdl requests we hang on to the PagingIo resource.
//
if ((NewMdl != NULL) && NT_SUCCESS(Status) && (*((PMDL *) NewMdl) != NULL)) { PagingIoAcquired = 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->CleanupStructure = Scb; }
NtfsCreateInternalAttributeStream( IrpContext, Scb, FALSE, NULL );
if (!DoingIoAtEof) { FsRtlUnlockFsRtlHeader( Header ); IrpContext->CleanupStructure = NULL; } }#endif
}
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 or sparse data stream
// which is not mapped, try to free any reserved space for the stream.
// Note: mapped compressed streams will generally not free reserved
// space
//
} else if (FlagOn( Scb->AttributeFlags, ATTRIBUTE_FLAG_COMPRESSION_MASK | ATTRIBUTE_FLAG_SPARSE )) {
NtfsFreeReservedClusters( Scb, StartingVbo, (ULONG) 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) {
CC_FILE_SIZES CcFileSizes;
//
// If we know this has gone to disk we update the Mft.
// This variable should never be set for a resident
// attribute.
// The lazy writer uses callbacks to have the filesizes updated on disk
// so we don't do any of this here
//
if (!FlagOn( IrpContext->State, IRP_CONTEXT_STATE_LAZY_WRITE )) {
if (UpdateMft) {
//
// Get the Scb if we don't already have it.
//
if (!ScbAcquired) { //
// Make sure we don't have any Mft records.
//
NtfsPurgeFileRecordCache( IrpContext ); NtfsAcquireExclusiveScb( IrpContext, Scb ); ScbAcquired = TRUE; if (FlagOn( Scb->ScbState, SCB_STATE_RESTORE_UNDERWAY )) { goto RestoreUnderway; } NtfsMungeScbSnapshot( IrpContext, Scb, OldFileSize ); } else if (FlagOn( Scb->ScbState, SCB_STATE_RESTORE_UNDERWAY )) { goto RestoreUnderway; } //
// 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, TRUE ); //
// Clear the check attribute size flag.
//
NtfsAcquireFsrtlHeader( Scb ); ClearFlag( Scb->ScbState, SCB_STATE_CHECK_ATTRIBUTE_SIZE ); //
// Otherwise we set the flag indicating that we need to
// update the attribute size.
//
} else { RestoreUnderway: NtfsAcquireFsrtlHeader( Scb ); SetFlag( Scb->ScbState, SCB_STATE_CHECK_ATTRIBUTE_SIZE ); } } else { NtfsAcquireFsrtlHeader( Scb ); }
ASSERT( !FlagOn( IrpContext->State, IRP_CONTEXT_STATE_LAZY_WRITE ) || ByteRange <= ((Header->ValidDataLength.QuadPart + PAGE_SIZE - 1) & ~((LONGLONG) (PAGE_SIZE - 1))) ); //
// 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;
#ifdef SYSCACHE_DEBUG
if (ScbIsBeingLogged( Scb )) { ULONG Flags;
CalculateSyscacheFlags( IrpContext, Flags, SCE_FLAG_WRITE ); FsRtlLogSyscacheEvent( Scb, SCE_VDL_CHANGE, Flags, StartingVbo, ByteCount, ByteRange ); }#endif
} CcFileSizes = *(PCC_FILE_SIZES)&Header->AllocationSize; DoingIoAtEof = FALSE;
//
// Inform Cc that we changed the VDL for non cached toplevel
//
if (CcIsFileCached( FileObject ) && NonCachedIo) { NtfsSetBothCacheSizes( FileObject, &CcFileSizes, Scb ); } else {
//
// If there is a compressed section, then update both file sizes to get
// the ValidDataLength update in the one we did not write.
//
#ifdef COMPRESS_ON_WIRE
if (Header->FileObjectC != NULL) { if (FlagOn(IrpContext->MinorFunction, IRP_MN_COMPRESSED)) { if (Scb->NonpagedScb->SegmentObject.SharedCacheMap != NULL) { CcSetFileSizes( FileObject, &CcFileSizes ); } } else { CcSetFileSizes( Header->FileObjectC, &CcFileSizes ); } }#endif
}
NtfsReleaseFsrtlHeader( Scb ); } }
//
// Abort transaction on error by raising. If this is the log file itself
// then just return normally.
//
NtfsPurgeFileRecordCache( IrpContext );
if (Scb != Scb->Vcb->LogFileScb) {
NtfsCleanupTransaction( IrpContext, Status, FALSE ); } } }
} finally {
DebugUnwind( NtfsCommonWrite );
//
// Clean up any Bcb from read/synchronize compressed.
//
#ifdef COMPRESS_ON_WIRE
if (CompressionSync != NULL) { NtfsReleaseCompressionSync( CompressionSync ); }#endif
if (CleanupAttributeContext) {
NtfsCleanupAttributeContext( IrpContext, &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 && !PagingIo) {
//
// Acquire the main resource to knock valid data to disk back.
//
if (RestoreValidDataToDisk) {
//
// Make sure we purge the file record cache as well. Otherwise
// a purge of the Mft may fail in a different thread which owns a resource
// this thread needs.
//
NtfsPurgeFileRecordCache( IrpContext ); NtfsAcquireExclusiveScb( IrpContext, Scb );
if (Scb->ValidDataToDisk > OldFileSize) { Scb->ValidDataToDisk = OldFileSize; }
NtfsReleaseScb( IrpContext, Scb ); }
NtfsAcquireFsrtlHeader( Scb );
//
// Always force a recalc for write at eof unless we've commited the filesize
// forward. In that case we should write at the calculated offset unless the
// file shrinks in between. See test at beginning of common write
//
if (FlagOn( IrpContext->State, IRP_CONTEXT_STATE_WRITING_AT_EOF ) && OldFileSize == IrpSp->Parameters.Write.ByteOffset.QuadPart) {
ClearFlag( IrpContext->State, IRP_CONTEXT_STATE_WRITING_AT_EOF ); IrpSp->Parameters.Write.ByteOffset.LowPart = FILE_WRITE_TO_END_OF_FILE; IrpSp->Parameters.Write.ByteOffset.HighPart = -1; }
Header->FileSize.QuadPart = OldFileSize;
ASSERT( Header->ValidDataLength.QuadPart <= Header->FileSize.QuadPart );
if (FileObject->SectionObjectPointer->SharedCacheMap != NULL) { CcGetFileSizePointer(FileObject)->QuadPart = OldFileSize; }#ifdef COMPRESS_ON_WIRE
if (Header->FileObjectC != NULL) { CcGetFileSizePointer(Header->FileObjectC)->QuadPart = OldFileSize; }#endif
NtfsReleaseFsrtlHeader( Scb );
}
//
// If the Scb or PagingIo resource has been acquired, release it.
//
if (PagingIoAcquired) { ExReleaseResourceLite( 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); } }
DebugTrace( -1, Dbg, ("NtfsCommonWrite -> %08lx\n", Status) ); }
//
// Complete the request if we didn't post it and no exception
//
// Note that NtfsCompleteRequest does the right thing if either
// IrpContext or Irp are NULL
//
if (!PostIrp) {
NtfsCompleteRequest( IrpContext, Irp, Status );
} else if (!OplockPostIrp) {
Status = NtfsPostRequest( IrpContext, Irp ); }
return Status;}
//
// Local support routine
//
NTSTATUS NtfsGetIoAtEof ( IN PIRP_CONTEXT IrpContext, IN PSCB Scb, IN LONGLONG StartingVbo, IN LONGLONG ByteCount, IN BOOLEAN Wait, OUT PBOOLEAN DoingIoAtEof, OUT PLONGLONG OldFileSize )
{ //
// 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->CleanupStructure == Scb->Fcb) || (IrpContext->TopLevelIrpContext->CleanupStructure == Scb)) {
*DoingIoAtEof = TRUE; *OldFileSize = Scb->Header.FileSize.QuadPart;
} else {
if (FlagOn( Scb->Header.Flags, FSRTL_FLAG_EOF_ADVANCE_ACTIVE ) && !Wait) { return STATUS_FILE_LOCK_CONFLICT; }
*DoingIoAtEof = !FlagOn( Scb->Header.Flags, FSRTL_FLAG_EOF_ADVANCE_ACTIVE ) || NtfsWaitForIoAtEof( &(Scb->Header), (PLARGE_INTEGER)&StartingVbo, (ULONG)ByteCount );
//
// Set the Flag if we are changing FileSize or ValidDataLength,
// and save current values.
//
if (*DoingIoAtEof) {
SetFlag( Scb->Header.Flags, FSRTL_FLAG_EOF_ADVANCE_ACTIVE );#if (DBG || defined( NTFS_FREE_ASSERTS ))
Scb->IoAtEofThread = (PERESOURCE_THREAD) ExGetCurrentResourceThread();#endif
//
// Store this in the IrpContext until commit or post
//
IrpContext->CleanupStructure = Scb; *OldFileSize = Scb->Header.FileSize.QuadPart;
#if (DBG || defined( NTFS_FREE_ASSERTS ))
} else {
ASSERT( Scb->IoAtEofThread != (PERESOURCE_THREAD) ExGetCurrentResourceThread() );#endif
} }
return STATUS_SUCCESS;}
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