/*++ Copyright (c) 1989-2000 Microsoft Corporation Module Name: FileInfo.c Abstract: This module implements the File Information routines for Fat called by the dispatch driver. // @@BEGIN_DDKSPLIT Author: Gary Kimura [GaryKi] 22-Oct-1990 Revision History: // @@END_DDKSPLIT --*/ #include "FatProcs.h" // // The Bug check file id for this module // #define BugCheckFileId (FAT_BUG_CHECK_FILEINFO) // // The local debug trace level // #define Dbg (DEBUG_TRACE_FILEINFO) VOID FatQueryBasicInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN PFILE_OBJECT FileObject, IN OUT PFILE_BASIC_INFORMATION Buffer, IN OUT PLONG Length ); VOID FatQueryStandardInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN OUT PFILE_STANDARD_INFORMATION Buffer, IN OUT PLONG Length ); VOID FatQueryInternalInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN OUT PFILE_INTERNAL_INFORMATION Buffer, IN OUT PLONG Length ); VOID FatQueryEaInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN OUT PFILE_EA_INFORMATION Buffer, IN OUT PLONG Length ); VOID FatQueryPositionInfo ( IN PIRP_CONTEXT IrpContext, IN PFILE_OBJECT FileObject, IN OUT PFILE_POSITION_INFORMATION Buffer, IN OUT PLONG Length ); VOID FatQueryNameInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN PCCB Ccb, IN OUT PFILE_NAME_INFORMATION Buffer, IN OUT PLONG Length ); VOID FatQueryShortNameInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN OUT PFILE_NAME_INFORMATION Buffer, IN OUT PLONG Length ); VOID FatQueryNetworkInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN PFILE_OBJECT FileObject, IN OUT PFILE_NETWORK_OPEN_INFORMATION Buffer, IN OUT PLONG Length ); NTSTATUS FatSetBasicInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PFCB Fcb, IN PCCB Ccb ); NTSTATUS FatSetDispositionInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PFILE_OBJECT FileObject, IN PFCB Fcb ); NTSTATUS FatSetRenameInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PVCB Vcb, IN PFCB Fcb, IN PCCB Ccb ); NTSTATUS FatSetPositionInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PFILE_OBJECT FileObject ); NTSTATUS FatSetAllocationInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PFCB Fcb, IN PFILE_OBJECT FileObject ); NTSTATUS FatSetEndOfFileInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PFILE_OBJECT FileObject, IN PVCB Vcb, IN PFCB Fcb ); VOID FatDeleteFile ( IN PIRP_CONTEXT IrpContext, IN PDCB TargetDcb, IN ULONG LfnOffset, IN ULONG DirentOffset, IN PDIRENT Dirent, IN PUNICODE_STRING Lfn ); VOID FatRenameEAs ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN USHORT ExtendedAttributes, IN POEM_STRING OldOemName ); #ifdef ALLOC_PRAGMA #pragma alloc_text(PAGE, FatCommonQueryInformation) #pragma alloc_text(PAGE, FatCommonSetInformation) #pragma alloc_text(PAGE, FatFsdQueryInformation) #pragma alloc_text(PAGE, FatFsdSetInformation) #pragma alloc_text(PAGE, FatQueryBasicInfo) #pragma alloc_text(PAGE, FatQueryEaInfo) #pragma alloc_text(PAGE, FatQueryInternalInfo) #pragma alloc_text(PAGE, FatQueryNameInfo) #pragma alloc_text(PAGE, FatQueryNetworkInfo) #pragma alloc_text(PAGE, FatQueryShortNameInfo) #pragma alloc_text(PAGE, FatQueryPositionInfo) #pragma alloc_text(PAGE, FatQueryStandardInfo) #pragma alloc_text(PAGE, FatSetAllocationInfo) #pragma alloc_text(PAGE, FatSetBasicInfo) #pragma alloc_text(PAGE, FatSetDispositionInfo) #pragma alloc_text(PAGE, FatSetEndOfFileInfo) #pragma alloc_text(PAGE, FatSetPositionInfo) #pragma alloc_text(PAGE, FatSetRenameInfo) #pragma alloc_text(PAGE, FatDeleteFile) #pragma alloc_text(PAGE, FatRenameEAs) #endif NTSTATUS FatFsdQueryInformation ( IN PVOLUME_DEVICE_OBJECT VolumeDeviceObject, IN PIRP Irp ) /*++ Routine Description: This routine implements the Fsd part of the NtQueryInformationFile API call. Arguments: VolumeDeviceObject - Supplies the volume device object where the file being queried exists. Irp - Supplies the Irp being processed. Return Value: NTSTATUS - The FSD status for the Irp. --*/ { NTSTATUS Status; PIRP_CONTEXT IrpContext = NULL; BOOLEAN TopLevel; DebugTrace(+1, Dbg, "FatFsdQueryInformation\n", 0); // // Call the common query routine, with blocking allowed if synchronous // FsRtlEnterFileSystem(); TopLevel = FatIsIrpTopLevel( Irp ); try { IrpContext = FatCreateIrpContext( Irp, CanFsdWait( Irp ) ); Status = FatCommonQueryInformation( IrpContext, Irp ); } except(FatExceptionFilter( IrpContext, GetExceptionInformation() )) { // // 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 // Status = FatProcessException( IrpContext, Irp, GetExceptionCode() ); } if (TopLevel) { IoSetTopLevelIrp( NULL ); } FsRtlExitFileSystem(); // // And return to our caller // DebugTrace(-1, Dbg, "FatFsdQueryInformation -> %08lx\n", Status); UNREFERENCED_PARAMETER( VolumeDeviceObject ); return Status; } NTSTATUS FatFsdSetInformation ( IN PVOLUME_DEVICE_OBJECT VolumeDeviceObject, IN PIRP Irp ) /*++ Routine Description: This routine implements the FSD part of the NtSetInformationFile API call. Arguments: VolumeDeviceObject - Supplies the volume device object where the file being set exists. Irp - Supplies the Irp being processed. Return Value: NTSTATUS - The FSD status for the Irp. --*/ { NTSTATUS Status; PIRP_CONTEXT IrpContext = NULL; BOOLEAN TopLevel; DebugTrace(+1, Dbg, "FatFsdSetInformation\n", 0); // // Call the common set routine, with blocking allowed if synchronous // FsRtlEnterFileSystem(); TopLevel = FatIsIrpTopLevel( Irp ); try { IrpContext = FatCreateIrpContext( Irp, CanFsdWait( Irp ) ); Status = FatCommonSetInformation( IrpContext, Irp ); } except(FatExceptionFilter( IrpContext, GetExceptionInformation() )) { // // 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 // Status = FatProcessException( IrpContext, Irp, GetExceptionCode() ); } if (TopLevel) { IoSetTopLevelIrp( NULL ); } FsRtlExitFileSystem(); // // And return to our caller // DebugTrace(-1, Dbg, "FatFsdSetInformation -> %08lx\n", Status); UNREFERENCED_PARAMETER( VolumeDeviceObject ); return Status; } NTSTATUS FatCommonQueryInformation ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp ) /*++ Routine Description: This is the common routine for querying file information called by both the fsd and fsp threads. Arguments: Irp - Supplies the Irp being processed Return Value: NTSTATUS - The return status for the operation --*/ { NTSTATUS Status; PIO_STACK_LOCATION IrpSp; PFILE_OBJECT FileObject; LONG Length; FILE_INFORMATION_CLASS FileInformationClass; PVOID Buffer; TYPE_OF_OPEN TypeOfOpen; PVCB Vcb; PFCB Fcb; PCCB Ccb; BOOLEAN FcbAcquired = FALSE; BOOLEAN VcbAcquired = FALSE; PFILE_ALL_INFORMATION AllInfo; // // Get the current stack location // IrpSp = IoGetCurrentIrpStackLocation( Irp ); FileObject = IrpSp->FileObject; DebugTrace(+1, Dbg, "FatCommonQueryInformation...\n", 0); DebugTrace( 0, Dbg, "Irp = %08lx\n", Irp); DebugTrace( 0, Dbg, "->Length = %08lx\n", IrpSp->Parameters.QueryFile.Length); DebugTrace( 0, Dbg, "->FileInformationClass = %08lx\n", IrpSp->Parameters.QueryFile.FileInformationClass); DebugTrace( 0, Dbg, "->Buffer = %08lx\n", Irp->AssociatedIrp.SystemBuffer); // // Reference our input parameters to make things easier // Length = (LONG)IrpSp->Parameters.QueryFile.Length; FileInformationClass = IrpSp->Parameters.QueryFile.FileInformationClass; Buffer = Irp->AssociatedIrp.SystemBuffer; // // Decode the file object // TypeOfOpen = FatDecodeFileObject( FileObject, &Vcb, &Fcb, &Ccb ); Status = STATUS_SUCCESS; try { // // Case on the type of open we're dealing with // switch (TypeOfOpen) { case UserVolumeOpen: // // We cannot query the user volume open. // Status = STATUS_INVALID_PARAMETER; break; case UserFileOpen: case UserDirectoryOpen: case DirectoryFile: // // NameInfo requires synchronization with deletion in order to perform // the full filename query. A lighter-weight way to do this would be per // directory as the full name is built up and since the multiple Fcb // lockorder is bottom up, this is conceivable. At this time, though, // this change is safer. // if (FileInformationClass == FileNameInformation || FileInformationClass == FileAllInformation) { if (!FatAcquireExclusiveVcb( IrpContext, Vcb )) { DebugTrace(0, Dbg, "Cannot acquire Vcb\n", 0); Status = FatFsdPostRequest( IrpContext, Irp ); IrpContext = NULL; Irp = NULL; try_return( Status ); } VcbAcquired = TRUE; } // // Acquire shared access to the fcb, except for a paging file // in order to avoid deadlocks with Mm. // if (!FlagOn( Fcb->FcbState, FCB_STATE_PAGING_FILE )) { if (!FatAcquireSharedFcb( IrpContext, Fcb )) { DebugTrace(0, Dbg, "Cannot acquire Fcb\n", 0); Status = FatFsdPostRequest( IrpContext, Irp ); IrpContext = NULL; Irp = NULL; try_return( Status ); } FcbAcquired = TRUE; } // // Make sure the Fcb is in a usable condition. This // will raise an error condition if the fcb is unusable // FatVerifyFcb( IrpContext, Fcb ); // // Based on the information class we'll do different // actions. Each of hte procedures that we're calling fills // up the output buffer, if possible. They will raise the // status STATUS_BUFFER_OVERFLOW for an insufficient buffer. // This is considered a somewhat unusual case and is handled // more cleanly with the exception mechanism rather than // testing a return status value for each call. // switch (FileInformationClass) { case FileAllInformation: // // For the all information class we'll typecast a local // pointer to the output buffer and then call the // individual routines to fill in the buffer. // AllInfo = Buffer; Length -= (sizeof(FILE_ACCESS_INFORMATION) + sizeof(FILE_MODE_INFORMATION) + sizeof(FILE_ALIGNMENT_INFORMATION)); FatQueryBasicInfo( IrpContext, Fcb, FileObject, &AllInfo->BasicInformation, &Length ); FatQueryStandardInfo( IrpContext, Fcb, &AllInfo->StandardInformation, &Length ); FatQueryInternalInfo( IrpContext, Fcb, &AllInfo->InternalInformation, &Length ); FatQueryEaInfo( IrpContext, Fcb, &AllInfo->EaInformation, &Length ); FatQueryPositionInfo( IrpContext, FileObject, &AllInfo->PositionInformation, &Length ); FatQueryNameInfo( IrpContext, Fcb, Ccb, &AllInfo->NameInformation, &Length ); break; case FileBasicInformation: FatQueryBasicInfo( IrpContext, Fcb, FileObject, Buffer, &Length ); break; case FileStandardInformation: FatQueryStandardInfo( IrpContext, Fcb, Buffer, &Length ); break; case FileInternalInformation: FatQueryInternalInfo( IrpContext, Fcb, Buffer, &Length ); break; case FileEaInformation: FatQueryEaInfo( IrpContext, Fcb, Buffer, &Length ); break; case FilePositionInformation: FatQueryPositionInfo( IrpContext, FileObject, Buffer, &Length ); break; case FileNameInformation: FatQueryNameInfo( IrpContext, Fcb, Ccb, Buffer, &Length ); break; case FileAlternateNameInformation: FatQueryShortNameInfo( IrpContext, Fcb, Buffer, &Length ); break; case FileNetworkOpenInformation: FatQueryNetworkInfo( IrpContext, Fcb, FileObject, Buffer, &Length ); break; default: Status = STATUS_INVALID_PARAMETER; break; } break; default: KdPrintEx((DPFLTR_FASTFAT_ID, DPFLTR_INFO_LEVEL, "FATQueryFile, Illegal TypeOfOpen = %08lx\n", TypeOfOpen)); Status = STATUS_INVALID_PARAMETER; break; } // // If we overflowed the buffer, set the length to 0 and change the // status to STATUS_BUFFER_OVERFLOW. // if ( Length < 0 ) { Status = STATUS_BUFFER_OVERFLOW; Length = 0; } // // Set the information field to the number of bytes actually filled in // and then complete the request // Irp->IoStatus.Information = IrpSp->Parameters.QueryFile.Length - Length; try_exit: NOTHING; } finally { DebugUnwind( FatCommonQueryInformation ); if (FcbAcquired) { FatReleaseFcb( IrpContext, Fcb ); } if (VcbAcquired) { FatReleaseVcb( IrpContext, Vcb ); } if (!AbnormalTermination()) { FatCompleteRequest( IrpContext, Irp, Status ); } DebugTrace(-1, Dbg, "FatCommonQueryInformation -> %08lx\n", Status); } return Status; } NTSTATUS FatCommonSetInformation ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp ) /*++ Routine Description: This is the common routine for setting file information called by both the fsd and fsp threads. Arguments: Irp - Supplies the Irp being processed Return Value: NTSTATUS - The return status for the operation --*/ { NTSTATUS Status; PIO_STACK_LOCATION IrpSp; PFILE_OBJECT FileObject; FILE_INFORMATION_CLASS FileInformationClass; TYPE_OF_OPEN TypeOfOpen; PVCB Vcb; PFCB Fcb; PCCB Ccb; BOOLEAN VcbAcquired = FALSE; BOOLEAN FcbAcquired = FALSE; // // Get the current stack location // IrpSp = IoGetCurrentIrpStackLocation( Irp ); DebugTrace(+1, Dbg, "FatCommonSetInformation...\n", 0); DebugTrace( 0, Dbg, "Irp = %08lx\n", Irp); DebugTrace( 0, Dbg, "->Length = %08lx\n", IrpSp->Parameters.SetFile.Length); DebugTrace( 0, Dbg, "->FileInformationClass = %08lx\n", IrpSp->Parameters.SetFile.FileInformationClass); DebugTrace( 0, Dbg, "->FileObject = %08lx\n", IrpSp->Parameters.SetFile.FileObject); DebugTrace( 0, Dbg, "->ReplaceIfExists = %08lx\n", IrpSp->Parameters.SetFile.ReplaceIfExists); DebugTrace( 0, Dbg, "->Buffer = %08lx\n", Irp->AssociatedIrp.SystemBuffer); // // Reference our input parameters to make things easier // FileInformationClass = IrpSp->Parameters.SetFile.FileInformationClass; FileObject = IrpSp->FileObject; // // Decode the file object // TypeOfOpen = FatDecodeFileObject( FileObject, &Vcb, &Fcb, &Ccb ); try { // // Case on the type of open we're dealing with // switch (TypeOfOpen) { case UserVolumeOpen: // // We cannot query the user volume open. // try_return( Status = STATUS_INVALID_PARAMETER ); break; case UserFileOpen: if (!FlagOn( Fcb->FcbState, FCB_STATE_PAGING_FILE ) && ((FileInformationClass == FileEndOfFileInformation) || (FileInformationClass == FileAllocationInformation))) { // // We check whether we can proceed // based on the state of the file oplocks. // Status = FsRtlCheckOplock( &Fcb->Specific.Fcb.Oplock, Irp, IrpContext, NULL, NULL ); if (Status != STATUS_SUCCESS) { try_return( Status ); } // // Set the flag indicating if Fast I/O is possible // Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( Fcb ); } break; case UserDirectoryOpen: break; default: try_return( Status = STATUS_INVALID_PARAMETER ); } // // We can only do a set on a nonroot dcb, so we do the test // and then fall through to the user file open code. // if (NodeType(Fcb) == FAT_NTC_ROOT_DCB) { if (FileInformationClass == FileDispositionInformation) { try_return( Status = STATUS_CANNOT_DELETE ); } try_return( Status = STATUS_INVALID_PARAMETER ); } // // In the following two cases, we cannot have creates occuring // while we are here, so acquire the volume exclusive. // if ((FileInformationClass == FileDispositionInformation) || (FileInformationClass == FileRenameInformation)) { if (!FatAcquireExclusiveVcb( IrpContext, Vcb )) { DebugTrace(0, Dbg, "Cannot acquire Vcb\n", 0); Status = FatFsdPostRequest( IrpContext, Irp ); Irp = NULL; IrpContext = NULL; try_return( Status ); } VcbAcquired = TRUE; } // // We need to look here to check whether the oplock state // will allow us to continue. We may have to loop to prevent // an oplock being granted between the time we check the oplock // and obtain the Fcb. // // // Acquire exclusive access to the Fcb, We use exclusive // because it is probable that one of the subroutines // that we call will need to monkey with file allocation, // create/delete extra fcbs. So we're willing to pay the // cost of exclusive Fcb access. // // Note that we do not acquire the resource for paging file // operations in order to avoid deadlock with Mm. // if (!FlagOn( Fcb->FcbState, FCB_STATE_PAGING_FILE )) { if (!FatAcquireExclusiveFcb( IrpContext, Fcb )) { DebugTrace(0, Dbg, "Cannot acquire Fcb\n", 0); Status = FatFsdPostRequest( IrpContext, Irp ); Irp = NULL; IrpContext = NULL; try_return( Status ); } FcbAcquired = TRUE; } Status = STATUS_SUCCESS; // // Make sure the Fcb is in a usable condition. This // will raise an error condition if the fcb is unusable // FatVerifyFcb( IrpContext, Fcb ); // // Based on the information class we'll do different // actions. Each of the procedures that we're calling will either // complete the request of send the request off to the fsp // to do the work. // switch (FileInformationClass) { case FileBasicInformation: Status = FatSetBasicInfo( IrpContext, Irp, Fcb, Ccb ); break; case FileDispositionInformation: // // If this is on deferred flush media, we have to be able to wait. // if ( FlagOn(Vcb->VcbState, VCB_STATE_FLAG_DEFERRED_FLUSH) && !FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) ) { Status = FatFsdPostRequest( IrpContext, Irp ); Irp = NULL; IrpContext = NULL; } else { Status = FatSetDispositionInfo( IrpContext, Irp, FileObject, Fcb ); } break; case FileRenameInformation: // // We proceed with this operation only if we can wait // if (!FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT)) { Status = FatFsdPostRequest( IrpContext, Irp ); Irp = NULL; IrpContext = NULL; } else { Status = FatSetRenameInfo( IrpContext, Irp, Vcb, Fcb, Ccb ); // // If STATUS_PENDING is returned it means the oplock // package has the Irp. Don't complete the request here. // if (Status == STATUS_PENDING) { Irp = NULL; IrpContext = NULL; } } break; case FilePositionInformation: Status = FatSetPositionInfo( IrpContext, Irp, FileObject ); break; case FileLinkInformation: Status = STATUS_INVALID_DEVICE_REQUEST; break; case FileAllocationInformation: Status = FatSetAllocationInfo( IrpContext, Irp, Fcb, FileObject ); break; case FileEndOfFileInformation: Status = FatSetEndOfFileInfo( IrpContext, Irp, FileObject, Vcb, Fcb ); break; default: Status = STATUS_INVALID_PARAMETER; break; } if ( IrpContext != NULL ) { FatUnpinRepinnedBcbs( IrpContext ); } try_exit: NOTHING; } finally { DebugUnwind( FatCommonSetInformation ); if (FcbAcquired) { FatReleaseFcb( IrpContext, Fcb ); } if (VcbAcquired) { FatReleaseVcb( IrpContext, Vcb ); } if (!AbnormalTermination()) { FatCompleteRequest( IrpContext, Irp, Status ); } DebugTrace(-1, Dbg, "FatCommonSetInformation -> %08lx\n", Status); } return Status; } // // Internal Support Routine // VOID FatQueryBasicInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN PFILE_OBJECT FileObject, IN OUT PFILE_BASIC_INFORMATION Buffer, IN OUT PLONG Length ) /*++ Description: This routine performs the query basic information function for fat. Arguments: Fcb - Supplies the Fcb being queried, it has been verified FileObject - Supplies the flag bit that indicates the file was modified. Buffer - Supplies a pointer to the buffer where the information is to be returned Length - Supplies the length of the buffer in bytes, and receives the remaining bytes free in the buffer upon return. Return Value: None --*/ { DebugTrace(+1, Dbg, "FatQueryBasicInfo...\n", 0); // // Zero out the output buffer, and set it to indicate that // the query is a normal file. Later we might overwrite the // attribute. // RtlZeroMemory( Buffer, sizeof(FILE_BASIC_INFORMATION) ); // // Extract the data and fill in the non zero fields of the output // buffer // if (Fcb->Header.NodeTypeCode == FAT_NTC_ROOT_DCB) { // // We have to munge a lie on the fly. Every time we have to // use 1/1/80 we need to convert to GMT since the TZ may have // changed on us. // ExLocalTimeToSystemTime( &FatJanOne1980, &Buffer->LastWriteTime ); Buffer->CreationTime = Buffer->LastAccessTime = Buffer->LastWriteTime; } else { Buffer->LastWriteTime = Fcb->LastWriteTime; Buffer->CreationTime = Fcb->CreationTime; Buffer->LastAccessTime = Fcb->LastAccessTime; } Buffer->FileAttributes = Fcb->DirentFatFlags; // // If the temporary flag is set, then set it in the buffer. // if (FlagOn( Fcb->FcbState, FCB_STATE_TEMPORARY )) { SetFlag( Buffer->FileAttributes, FILE_ATTRIBUTE_TEMPORARY ); } // // If no attributes were set, set the normal bit. // if (Buffer->FileAttributes == 0) { Buffer->FileAttributes = FILE_ATTRIBUTE_NORMAL; } // // Update the length and status output variables // *Length -= sizeof( FILE_BASIC_INFORMATION ); DebugTrace( 0, Dbg, "*Length = %08lx\n", *Length); DebugTrace(-1, Dbg, "FatQueryBasicInfo -> VOID\n", 0); return; } // // Internal Support Routine // VOID FatQueryStandardInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN OUT PFILE_STANDARD_INFORMATION Buffer, IN OUT PLONG Length ) /*++ Routine Description: This routine performs the query standard information function for fat. Arguments: Fcb - Supplies the Fcb being queried, it has been verified Buffer - Supplies a pointer to the buffer where the information is to be returned Length - Supplies the length of the buffer in bytes, and receives the remaining bytes free in the buffer upon return. Return Value: None --*/ { DebugTrace(+1, Dbg, "FatQueryStandardInfo...\n", 0); // // Zero out the output buffer, and fill in the number of links // and the delete pending flag. // RtlZeroMemory( Buffer, sizeof(FILE_STANDARD_INFORMATION) ); Buffer->NumberOfLinks = 1; Buffer->DeletePending = BooleanFlagOn( Fcb->FcbState, FCB_STATE_DELETE_ON_CLOSE ); // // Case on whether this is a file or a directory, and extract // the information and fill in the fcb/dcb specific parts // of the output buffer // if (NodeType(Fcb) == FAT_NTC_FCB) { if (Fcb->Header.AllocationSize.QuadPart == FCB_LOOKUP_ALLOCATIONSIZE_HINT) { FatLookupFileAllocationSize( IrpContext, Fcb ); } Buffer->AllocationSize = Fcb->Header.AllocationSize; Buffer->EndOfFile = Fcb->Header.FileSize; Buffer->Directory = FALSE; } else { Buffer->Directory = TRUE; } // // Update the length and status output variables // *Length -= sizeof( FILE_STANDARD_INFORMATION ); DebugTrace( 0, Dbg, "*Length = %08lx\n", *Length); DebugTrace(-1, Dbg, "FatQueryStandardInfo -> VOID\n", 0); return; } // // Internal Support Routine // VOID FatQueryInternalInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN OUT PFILE_INTERNAL_INFORMATION Buffer, IN OUT PLONG Length ) /*++ Routine Description: This routine performs the query internal information function for fat. Arguments: Fcb - Supplies the Fcb being queried, it has been verified Buffer - Supplies a pointer to the buffer where the information is to be returned Length - Supplies the length of the buffer in bytes, and receives the remaining bytes free in the buffer upon return. Return Value: None --*/ { DebugTrace(+1, Dbg, "FatQueryInternalInfo...\n", 0); try { Buffer->IndexNumber.QuadPart = FatGenerateFileIdFromFcb( Fcb ); // // Update the length and status output variables // *Length -= sizeof( FILE_INTERNAL_INFORMATION ); } finally { DebugUnwind( FatQueryInternalInfo ); DebugTrace( 0, Dbg, "*Length = %08lx\n", *Length); DebugTrace(-1, Dbg, "FatQueryInternalInfo -> VOID\n", 0); } return; } // // Internal Support Routine // VOID FatQueryEaInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN OUT PFILE_EA_INFORMATION Buffer, IN OUT PLONG Length ) /*++ Routine Description: This routine performs the query Ea information function for fat. Arguments: Fcb - Supplies the Fcb being queried, it has been verified Buffer - Supplies a pointer to the buffer where the information is to be returned Length - Supplies the length of the buffer in bytes, and receives the remaining bytes free in the buffer upon return. Return Value: None --*/ { PBCB Bcb; DebugTrace(+1, Dbg, "FatQueryEaInfo...\n", 0); Bcb = NULL; try { // // Zero out the output buffer // RtlZeroMemory( Buffer, sizeof(FILE_EA_INFORMATION) ); // // The Root dcb does not have any EAs so don't look for any. Fat32 // doesn't have any, either. // if ( NodeType( Fcb ) != FAT_NTC_ROOT_DCB && !FatIsFat32( Fcb->Vcb )) { PDIRENT Dirent; // // Try to get the dirent for this file. // FatGetDirentFromFcbOrDcb( IrpContext, Fcb, &Dirent, &Bcb ); if (Dirent != NULL) { // // Get a the size needed to store the full eas for the file. // FatGetEaLength( IrpContext, Fcb->Vcb, Dirent, &Buffer->EaSize ); } } // // Update the length and status output variables // *Length -= sizeof( FILE_EA_INFORMATION ); } finally { DebugUnwind( FatQueryEaInfo ); // // Unpin the dirent if pinned. // FatUnpinBcb( IrpContext, Bcb ); DebugTrace( 0, Dbg, "*Length = %08lx\n", *Length); DebugTrace(-1, Dbg, "FatQueryEaInfo -> VOID\n", 0); } return; } // // Internal Support Routine // VOID FatQueryPositionInfo ( IN PIRP_CONTEXT IrpContext, IN PFILE_OBJECT FileObject, IN OUT PFILE_POSITION_INFORMATION Buffer, IN OUT PLONG Length ) /*++ Routine Description: This routine performs the query position information function for fat. Arguments: FileObject - Supplies the File object being queried Buffer - Supplies a pointer to the buffer where the information is to be returned Length - Supplies the length of the buffer in bytes, and receives the remaining bytes free in the buffer upon return. Return Value: None --*/ { DebugTrace(+1, Dbg, "FatQueryPositionInfo...\n", 0); // // Get the current position found in the file object. // Buffer->CurrentByteOffset = FileObject->CurrentByteOffset; // // Update the length and status output variables // *Length -= sizeof( FILE_POSITION_INFORMATION ); DebugTrace( 0, Dbg, "*Length = %08lx\n", *Length); DebugTrace(-1, Dbg, "FatQueryPositionInfo -> VOID\n", 0); UNREFERENCED_PARAMETER( IrpContext ); return; } // // Internal Support Routine // VOID FatQueryNameInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN PCCB Ccb, IN OUT PFILE_NAME_INFORMATION Buffer, IN OUT PLONG Length ) /*++ Routine Description: This routine performs the query name information function for fat. Arguments: Fcb - Supplies the Fcb being queried, it has been verified Ccb - Supplies the Ccb for the context of the user open Buffer - Supplies a pointer to the buffer where the information is to be returned Length - Supplies the length of the buffer in bytes, and receives the remaining bytes free in the buffer upon return. Return Value: None --*/ { ULONG BytesToCopy; LONG TrimLength; BOOLEAN Overflow = FALSE; DebugTrace(+1, Dbg, "FatQueryNameInfo...\n", 0); // // Convert the name to UNICODE // *Length -= FIELD_OFFSET(FILE_NAME_INFORMATION, FileName[0]); // // Use the full filename to build the path up. If we wanted to be // slick in the future, we'd just build the path directly into the // return buffer and avoid constructing the full filename, but since // the full filename winds up being required so often lets not // over optimize this case yet. // if (Fcb->FullFileName.Buffer == NULL) { FatSetFullFileNameInFcb( IrpContext, Fcb ); } // // Here is where it gets a smidge tricky. FinalNameLength is the length // of the LFN element if it exists, and since the long name is always used // to build FullFileName, we have two cases: // // 1) short name: use FinalNameLength to tear off the path from FullFileName // and append the UNICODE converted short name. // 2) long name: just use FullFileName // // We bias to the name the user thinks they opened by. This winds // up fixing some oddball tunneling cases where intermediate filters // translate operations like delete into renames - this lets them // do the operation in the context of the name the user was using. // // It also matches what NTFS does, and so we have the definition of // correct behavior. // // // // Assume there is no long name and we are just going to use // FullFileName. // TrimLength = 0; // // If a LongName exists and the original open was by the short name // then set TrimLength to point to the place where the short name goes. // // // Note: The Ccb can be NULL. The lazy writer calls to get the name of // a DirectoryOpen FILE_OBJECT that it wants to display in the lost // delayed write popup. Handle this case by just using the FileFullName. // if (Fcb->LongName.Unicode.Name.Unicode.Buffer != NULL) { if ((Ccb != NULL) && FlagOn(Ccb->Flags, CCB_FLAG_OPENED_BY_SHORTNAME)) { TrimLength = Fcb->FinalNameLength; } } if (*Length < Fcb->FullFileName.Length - TrimLength) { BytesToCopy = *Length; Overflow = TRUE; } else { BytesToCopy = Fcb->FullFileName.Length - TrimLength; *Length -= BytesToCopy; } RtlCopyMemory( &Buffer->FileName[0], Fcb->FullFileName.Buffer, BytesToCopy ); // // Note that this is just the amount of name we've copied so far. It'll // either be all of it (long) or the path element including the \ (short). // Buffer->FileNameLength = Fcb->FullFileName.Length - TrimLength; // // If we trimmed off the name element, this is the short name case. Pick // up the UNICODE conversion and append it. // if (TrimLength != 0) { UNICODE_STRING ShortName; WCHAR ShortNameBuffer[12]; NTSTATUS Status; // // Convert the short name to UNICODE and figure out how much // of it can fit. Again, we always bump the returned length // to indicate how much is available even if we can't return it. // ShortName.Length = 0; ShortName.MaximumLength = sizeof(ShortNameBuffer); ShortName.Buffer = ShortNameBuffer; Status = RtlOemStringToCountedUnicodeString( &ShortName, &Fcb->ShortName.Name.Oem, FALSE ); ASSERT( Status == STATUS_SUCCESS ); if (!Overflow) { if (*Length < ShortName.Length) { BytesToCopy = *Length; Overflow = TRUE; } else { BytesToCopy = ShortName.Length; *Length -= BytesToCopy; } RtlCopyMemory( (PUCHAR)&Buffer->FileName[0] + Buffer->FileNameLength, ShortName.Buffer, BytesToCopy ); } Buffer->FileNameLength += ShortName.Length; } if (Overflow) { *Length = -1; } // // Return to caller // DebugTrace( 0, Dbg, "*Length = %08lx\n", *Length); DebugTrace(-1, Dbg, "FatQueryNameInfo -> VOID\n", 0); UNREFERENCED_PARAMETER( IrpContext ); return; } // // Internal Support Routine // VOID FatQueryShortNameInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN OUT PFILE_NAME_INFORMATION Buffer, IN OUT PLONG Length ) /*++ Routine Description: This routine queries the short name of the file. Arguments: Fcb - Supplies the Fcb being queried, it has been verified Buffer - Supplies a pointer to the buffer where the information is to be returned Length - Supplies the length of the buffer in bytes, and receives the remaining bytes free in the buffer upon return. Return Value: None --*/ { NTSTATUS Status; ULONG BytesToCopy; WCHAR ShortNameBuffer[12]; UNICODE_STRING ShortName; DebugTrace(+1, Dbg, "FatQueryNameInfo...\n", 0); // // Convert the name to UNICODE // ShortName.Length = 0; ShortName.MaximumLength = sizeof(ShortNameBuffer); ShortName.Buffer = ShortNameBuffer; *Length -= FIELD_OFFSET(FILE_NAME_INFORMATION, FileName[0]); Status = RtlOemStringToCountedUnicodeString( &ShortName, &Fcb->ShortName.Name.Oem, FALSE ); ASSERT( Status == STATUS_SUCCESS ); // // If we overflow, set *Length to -1 as a flag. // if (*Length < ShortName.Length) { BytesToCopy = *Length; *Length = -1; } else { BytesToCopy = ShortName.Length; *Length -= ShortName.Length; } RtlCopyMemory( &Buffer->FileName[0], &ShortName.Buffer[0], BytesToCopy ); Buffer->FileNameLength = ShortName.Length; // // Return to caller // DebugTrace( 0, Dbg, "*Length = %08lx\n", *Length); DebugTrace(-1, Dbg, "FatQueryNameInfo -> VOID\n", 0); UNREFERENCED_PARAMETER( IrpContext ); return; } // // Internal Support Routine // VOID FatQueryNetworkInfo ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN PFILE_OBJECT FileObject, IN OUT PFILE_NETWORK_OPEN_INFORMATION Buffer, IN OUT PLONG Length ) /*++ Description: This routine performs the query network open information function for fat. Arguments: Fcb - Supplies the Fcb being queried, it has been verified FileObject - Supplies the flag bit that indicates the file was modified. Buffer - Supplies a pointer to the buffer where the information is to be returned Length - Supplies the length of the buffer in bytes, and receives the remaining bytes free in the buffer upon return. Return Value: None --*/ { DebugTrace(+1, Dbg, "FatQueryNetworkInfo...\n", 0); // // Zero out the output buffer, and set it to indicate that // the query is a normal file. Later we might overwrite the // attribute. // RtlZeroMemory( Buffer, sizeof(FILE_NETWORK_OPEN_INFORMATION) ); // // Extract the data and fill in the non zero fields of the output // buffer // if (Fcb->Header.NodeTypeCode == FAT_NTC_ROOT_DCB) { // // We have to munge a lie on the fly. Every time we have to // use 1/1/80 we need to convert to GMT since the TZ may have // changed on us. // ExLocalTimeToSystemTime( &FatJanOne1980, &Buffer->LastWriteTime ); Buffer->CreationTime = Buffer->LastAccessTime = Buffer->LastWriteTime; } else { Buffer->LastWriteTime.QuadPart = Fcb->LastWriteTime.QuadPart; Buffer->CreationTime.QuadPart = Fcb->CreationTime.QuadPart; Buffer->LastAccessTime.QuadPart = Fcb->LastAccessTime.QuadPart; } Buffer->FileAttributes = Fcb->DirentFatFlags; // // If the temporary flag is set, then set it in the buffer. // if (FlagOn( Fcb->FcbState, FCB_STATE_TEMPORARY )) { SetFlag( Buffer->FileAttributes, FILE_ATTRIBUTE_TEMPORARY ); } // // If no attributes were set, set the normal bit. // if (Buffer->FileAttributes == 0) { Buffer->FileAttributes = FILE_ATTRIBUTE_NORMAL; } // // Case on whether this is a file or a directory, and extract // the information and fill in the fcb/dcb specific parts // of the output buffer // if (NodeType(Fcb) == FAT_NTC_FCB) { if (Fcb->Header.AllocationSize.QuadPart == FCB_LOOKUP_ALLOCATIONSIZE_HINT) { FatLookupFileAllocationSize( IrpContext, Fcb ); } Buffer->AllocationSize.QuadPart = Fcb->Header.AllocationSize.QuadPart; Buffer->EndOfFile.QuadPart = Fcb->Header.FileSize.QuadPart; } // // Update the length and status output variables // *Length -= sizeof( FILE_NETWORK_OPEN_INFORMATION ); DebugTrace( 0, Dbg, "*Length = %08lx\n", *Length); DebugTrace(-1, Dbg, "FatQueryNetworkInfo -> VOID\n", 0); return; } // // Internal Support routine // NTSTATUS FatSetBasicInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PFCB Fcb, IN PCCB Ccb ) /*++ Routine Description: This routine performs the set basic information for fat. It either completes the request or enqueues it off to the fsp. Arguments: Irp - Supplies the irp being processed Fcb - Supplies the Fcb or Dcb being processed, already known not to be the root dcb Ccb - Supplies the flag bit that control updating the last modify time on cleanup. Return Value: NTSTATUS - The result of this operation if it completes without an exception. --*/ { NTSTATUS Status; PFILE_BASIC_INFORMATION Buffer; PDIRENT Dirent; PBCB DirentBcb; FAT_TIME_STAMP CreationTime; UCHAR CreationMSec; FAT_TIME_STAMP LastWriteTime; FAT_TIME_STAMP LastAccessTime; FAT_DATE LastAccessDate; UCHAR Attributes; BOOLEAN ModifyCreation = FALSE; BOOLEAN ModifyLastWrite = FALSE; BOOLEAN ModifyLastAccess = FALSE; LARGE_INTEGER LargeCreationTime; LARGE_INTEGER LargeLastWriteTime; LARGE_INTEGER LargeLastAccessTime; ULONG NotifyFilter = 0; DebugTrace(+1, Dbg, "FatSetBasicInfo...\n", 0); Buffer = Irp->AssociatedIrp.SystemBuffer; // // If the user is specifying -1 for a field, that means // we should leave that field unchanged, even if we might // have otherwise set it ourselves. We'll set the Ccb flag // saying that the user set the field so that we // don't do our default updating. // // We set the field to 0 then so we know not to actually // set the field to the user-specified (and in this case, // illegal) value. // if (Buffer->LastWriteTime.QuadPart == -1) { SetFlag( Ccb->Flags, CCB_FLAG_USER_SET_LAST_WRITE ); Buffer->LastWriteTime.QuadPart = 0; } if (Buffer->LastAccessTime.QuadPart == -1) { SetFlag( Ccb->Flags, CCB_FLAG_USER_SET_LAST_ACCESS ); Buffer->LastAccessTime.QuadPart = 0; } if (Buffer->CreationTime.QuadPart == -1) { SetFlag( Ccb->Flags, CCB_FLAG_USER_SET_CREATION ); Buffer->CreationTime.QuadPart = 0; } DirentBcb = NULL; Status = STATUS_SUCCESS; try { LARGE_INTEGER FatLocalDecThirtyOne1979; LARGE_INTEGER FatLocalJanOne1980; ExLocalTimeToSystemTime( &FatDecThirtyOne1979, &FatLocalDecThirtyOne1979 ); ExLocalTimeToSystemTime( &FatJanOne1980, &FatLocalJanOne1980 ); // // Get a pointer to the dirent // ASSERT( Fcb->FcbCondition == FcbGood ); FatGetDirentFromFcbOrDcb( IrpContext, Fcb, &Dirent, &DirentBcb ); ASSERT( Dirent && DirentBcb ); // // Check if the user specified a non-zero creation time // if (FatData.ChicagoMode && (Buffer->CreationTime.QuadPart != 0)) { LargeCreationTime = Buffer->CreationTime; // // Convert the Nt time to a Fat time // if ( !FatNtTimeToFatTime( IrpContext, &LargeCreationTime, FALSE, &CreationTime, &CreationMSec )) { // // Special case the value 12/31/79 and treat this as 1/1/80. // This '79 value can happen because of time zone issues. // if ((LargeCreationTime.QuadPart >= FatLocalDecThirtyOne1979.QuadPart) && (LargeCreationTime.QuadPart < FatLocalJanOne1980.QuadPart)) { CreationTime = FatTimeJanOne1980; LargeCreationTime = FatLocalJanOne1980; } else { DebugTrace(0, Dbg, "Invalid CreationTime\n", 0); try_return( Status = STATUS_INVALID_PARAMETER ); } // // Don't worry about CreationMSec // CreationMSec = 0; } ModifyCreation = TRUE; } // // Check if the user specified a non-zero last access time // if (FatData.ChicagoMode && (Buffer->LastAccessTime.QuadPart != 0)) { LargeLastAccessTime = Buffer->LastAccessTime; // // Convert the Nt time to a Fat time // if ( !FatNtTimeToFatTime( IrpContext, &LargeLastAccessTime, TRUE, &LastAccessTime, NULL )) { // // Special case the value 12/31/79 and treat this as 1/1/80. // This '79 value can happen because of time zone issues. // if ((LargeLastAccessTime.QuadPart >= FatLocalDecThirtyOne1979.QuadPart) && (LargeLastAccessTime.QuadPart < FatLocalJanOne1980.QuadPart)) { LastAccessTime = FatTimeJanOne1980; LargeLastAccessTime = FatLocalJanOne1980; } else { DebugTrace(0, Dbg, "Invalid LastAccessTime\n", 0); try_return( Status = STATUS_INVALID_PARAMETER ); } } LastAccessDate = LastAccessTime.Date; ModifyLastAccess = TRUE; } // // Check if the user specified a non-zero last write time // if (Buffer->LastWriteTime.QuadPart != 0) { // // First do a quick check here if the this time is the same // time as LastAccessTime. // if (ModifyLastAccess && (Buffer->LastWriteTime.QuadPart == Buffer->LastAccessTime.QuadPart)) { ModifyLastWrite = TRUE; LastWriteTime = LastAccessTime; LargeLastWriteTime = LargeLastAccessTime; } else { LargeLastWriteTime = Buffer->LastWriteTime; // // Convert the Nt time to a Fat time // if ( !FatNtTimeToFatTime( IrpContext, &LargeLastWriteTime, TRUE, &LastWriteTime, NULL )) { // // Special case the value 12/31/79 and treat this as 1/1/80. // This '79 value can happen because of time zone issues. // if ((LargeLastWriteTime.QuadPart >= FatLocalDecThirtyOne1979.QuadPart) && (LargeLastWriteTime.QuadPart < FatLocalJanOne1980.QuadPart)) { LastWriteTime = FatTimeJanOne1980; LargeLastWriteTime = FatLocalJanOne1980; } else { DebugTrace(0, Dbg, "Invalid LastWriteTime\n", 0); try_return( Status = STATUS_INVALID_PARAMETER ); } } ModifyLastWrite = TRUE; } } // // Check if the user specified a non zero file attributes byte // if (Buffer->FileAttributes != 0) { // // Only permit the attributes that FAT understands. The rest are silently // dropped on the floor. // Attributes = (UCHAR)(Buffer->FileAttributes & (FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_ARCHIVE)); // // Make sure that for a file the directory bit is not set // and that for a directory the bit is set. // if (NodeType(Fcb) == FAT_NTC_FCB) { if (FlagOn(Buffer->FileAttributes, FILE_ATTRIBUTE_DIRECTORY)) { DebugTrace(0, Dbg, "Attempt to set dir attribute on file\n", 0); try_return( Status = STATUS_INVALID_PARAMETER ); } } else { Attributes |= FAT_DIRENT_ATTR_DIRECTORY; } // // Mark the FcbState temporary flag correctly. // if (FlagOn(Buffer->FileAttributes, FILE_ATTRIBUTE_TEMPORARY)) { // // Don't allow the temporary bit to be set on directories. // if (NodeType(Fcb) == FAT_NTC_DCB) { DebugTrace(0, Dbg, "No temporary directories\n", 0); try_return( Status = STATUS_INVALID_PARAMETER ); } SetFlag( Fcb->FcbState, FCB_STATE_TEMPORARY ); SetFlag( IoGetCurrentIrpStackLocation(Irp)->FileObject->Flags, FO_TEMPORARY_FILE ); } else { ClearFlag( Fcb->FcbState, FCB_STATE_TEMPORARY ); ClearFlag( IoGetCurrentIrpStackLocation(Irp)->FileObject->Flags, FO_TEMPORARY_FILE ); } // // Set the new attributes byte, and mark the bcb dirty // Fcb->DirentFatFlags = Attributes; Dirent->Attributes = Attributes; NotifyFilter |= FILE_NOTIFY_CHANGE_ATTRIBUTES; } if ( ModifyCreation ) { // // Set the new last write time in the dirent, and mark // the bcb dirty // Fcb->CreationTime = LargeCreationTime; Dirent->CreationTime = CreationTime; Dirent->CreationMSec = CreationMSec; NotifyFilter |= FILE_NOTIFY_CHANGE_CREATION; // // Now we have to round the time in the Fcb up to the // nearest tem msec. // Fcb->CreationTime.QuadPart = ((Fcb->CreationTime.QuadPart + AlmostTenMSec) / TenMSec) * TenMSec; // // Now because the user just set the creation time we // better not set the creation time on close // SetFlag( Ccb->Flags, CCB_FLAG_USER_SET_CREATION ); } if ( ModifyLastAccess ) { // // Set the new last write time in the dirent, and mark // the bcb dirty // Fcb->LastAccessTime = LargeLastAccessTime; Dirent->LastAccessDate = LastAccessDate; NotifyFilter |= FILE_NOTIFY_CHANGE_LAST_ACCESS; // // Now we have to truncate the time in the Fcb down to the // current day. This has to be in LocalTime though, so first // convert to local, trunacate, then set back to GMT. // ExSystemTimeToLocalTime( &Fcb->LastAccessTime, &Fcb->LastAccessTime ); Fcb->LastAccessTime.QuadPart = (Fcb->LastAccessTime.QuadPart / FatOneDay.QuadPart) * FatOneDay.QuadPart; ExLocalTimeToSystemTime( &Fcb->LastAccessTime, &Fcb->LastAccessTime ); // // Now because the user just set the last access time we // better not set the last access time on close // SetFlag( Ccb->Flags, CCB_FLAG_USER_SET_LAST_ACCESS ); } if ( ModifyLastWrite ) { // // Set the new last write time in the dirent, and mark // the bcb dirty // Fcb->LastWriteTime = LargeLastWriteTime; Dirent->LastWriteTime = LastWriteTime; NotifyFilter |= FILE_NOTIFY_CHANGE_LAST_WRITE; // // Now we have to round the time in the Fcb up to the // nearest two seconds. // Fcb->LastWriteTime.QuadPart = ((Fcb->LastWriteTime.QuadPart + AlmostTwoSeconds) / TwoSeconds) * TwoSeconds; // // Now because the user just set the last write time we // better not set the last write time on close // SetFlag( Ccb->Flags, CCB_FLAG_USER_SET_LAST_WRITE ); } // // If we modified any of the values, we report this to the notify // package. // // We also take this opportunity to set the current file size and // first cluster in the Dirent in order to support a server hack. // if (NotifyFilter != 0) { if (NodeType(Fcb) == FAT_NTC_FCB) { Dirent->FileSize = Fcb->Header.FileSize.LowPart; Dirent->FirstClusterOfFile = (USHORT)Fcb->FirstClusterOfFile; if (FatIsFat32(Fcb->Vcb)) { Dirent->FirstClusterOfFileHi = (USHORT)(Fcb->FirstClusterOfFile >> 16); } } FatNotifyReportChange( IrpContext, Fcb->Vcb, Fcb, NotifyFilter, FILE_ACTION_MODIFIED ); FatSetDirtyBcb( IrpContext, DirentBcb, Fcb->Vcb, TRUE ); } try_exit: NOTHING; } finally { DebugUnwind( FatSetBasicInfo ); FatUnpinBcb( IrpContext, DirentBcb ); DebugTrace(-1, Dbg, "FatSetBasicInfo -> %08lx\n", Status); } return Status; } // // Internal Support Routine // NTSTATUS FatSetDispositionInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PFILE_OBJECT FileObject, IN PFCB Fcb ) /*++ Routine Description: This routine performs the set disposition information for fat. It either completes the request or enqueues it off to the fsp. Arguments: Irp - Supplies the irp being processed FileObject - Supplies the file object being processed Fcb - Supplies the Fcb or Dcb being processed, already known not to be the root dcb Return Value: NTSTATUS - The result of this operation if it completes without an exception. --*/ { PFILE_DISPOSITION_INFORMATION Buffer; PBCB Bcb; PDIRENT Dirent; DebugTrace(+1, Dbg, "FatSetDispositionInfo...\n", 0); Buffer = Irp->AssociatedIrp.SystemBuffer; // // Check if the user wants to delete the file or not delete // the file // if (Buffer->DeleteFile) { // // Check if the file is marked read only // if (FlagOn(Fcb->DirentFatFlags, FAT_DIRENT_ATTR_READ_ONLY)) { DebugTrace(-1, Dbg, "Cannot delete readonly file\n", 0); return STATUS_CANNOT_DELETE; } // // Make sure there is no process mapping this file as an image. // if (!MmFlushImageSection( &Fcb->NonPaged->SectionObjectPointers, MmFlushForDelete )) { DebugTrace(-1, Dbg, "Cannot delete user mapped image\n", 0); return STATUS_CANNOT_DELETE; } // // Check if this is a dcb and if so then only allow // the request if the directory is empty. // if (NodeType(Fcb) == FAT_NTC_ROOT_DCB) { DebugTrace(-1, Dbg, "Cannot delete root Directory\n", 0); return STATUS_CANNOT_DELETE; } if (NodeType(Fcb) == FAT_NTC_DCB) { DebugTrace(-1, Dbg, "User wants to delete a directory\n", 0); // // Check if the directory is empty // if ( !FatIsDirectoryEmpty(IrpContext, Fcb) ) { DebugTrace(-1, Dbg, "Directory is not empty\n", 0); return STATUS_DIRECTORY_NOT_EMPTY; } } // // If this is a floppy, touch the volume so to verify that it // is not write protected. // if ( FlagOn(Fcb->Vcb->Vpb->RealDevice->Characteristics, FILE_FLOPPY_DISKETTE)) { PVCB Vcb; PBCB LocalBcb = NULL; UCHAR *LocalBuffer; UCHAR TmpChar; ULONG BytesToMap; IO_STATUS_BLOCK Iosb; Vcb = Fcb->Vcb; BytesToMap = Vcb->AllocationSupport.FatIndexBitSize == 12 ? FatReservedBytes(&Vcb->Bpb) + FatBytesPerFat(&Vcb->Bpb):PAGE_SIZE; FatReadVolumeFile( IrpContext, Vcb, 0, BytesToMap, &LocalBcb, (PVOID *)&LocalBuffer ); try { if (!CcPinMappedData( Vcb->VirtualVolumeFile, &FatLargeZero, BytesToMap, BooleanFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT), &LocalBcb )) { // // Could not pin the data without waiting (cache miss). // FatRaiseStatus( IrpContext, STATUS_CANT_WAIT ); } // // Make Mm, myself, and Cc think the byte is dirty, and then // force a writethrough. // LocalBuffer += FatReservedBytes(&Vcb->Bpb); TmpChar = LocalBuffer[0]; LocalBuffer[0] = TmpChar; FatAddMcbEntry( Vcb, &Vcb->DirtyFatMcb, FatReservedBytes( &Vcb->Bpb ), FatReservedBytes( &Vcb->Bpb ), Vcb->Bpb.BytesPerSector ); } finally { if (AbnormalTermination() && (LocalBcb != NULL)) { FatUnpinBcb( IrpContext, LocalBcb ); } } CcRepinBcb( LocalBcb ); CcSetDirtyPinnedData( LocalBcb, NULL ); CcUnpinData( LocalBcb ); DbgDoit( ASSERT( IrpContext->PinCount )); DbgDoit( IrpContext->PinCount -= 1 ); CcUnpinRepinnedBcb( LocalBcb, TRUE, &Iosb ); // // If this was not successful, raise the status. // if ( !NT_SUCCESS(Iosb.Status) ) { FatNormalizeAndRaiseStatus( IrpContext, Iosb.Status ); } } else { // // Just set a Bcb dirty here. The above code was only there to // detect a write protected floppy, while the below code works // for any write protected media and only takes a hit when the // volume in clean. // FatGetDirentFromFcbOrDcb( IrpContext, Fcb, &Dirent, &Bcb ); // // This has to work for the usual reasons (we verified the Fcb within // volume synch). // ASSERT( Bcb != NULL ); try { FatSetDirtyBcb( IrpContext, Bcb, Fcb->Vcb, TRUE ); } finally { FatUnpinBcb( IrpContext, Bcb ); } } // // At this point either we have a file or an empty directory // so we know the delete can proceed. // SetFlag( Fcb->FcbState, FCB_STATE_DELETE_ON_CLOSE ); FileObject->DeletePending = TRUE; // // If this is a directory then report this delete pending to // the dir notify package. // if (NodeType(Fcb) == FAT_NTC_DCB) { FsRtlNotifyFullChangeDirectory( Fcb->Vcb->NotifySync, &Fcb->Vcb->DirNotifyList, FileObject->FsContext, NULL, FALSE, FALSE, 0, NULL, NULL, NULL ); } } else { // // The user doesn't want to delete the file so clear // the delete on close bit // DebugTrace(0, Dbg, "User want to not delete file\n", 0); ClearFlag( Fcb->FcbState, FCB_STATE_DELETE_ON_CLOSE ); FileObject->DeletePending = FALSE; } DebugTrace(-1, Dbg, "FatSetDispositionInfo -> STATUS_SUCCESS\n", 0); return STATUS_SUCCESS; } // // Internal Support Routine // NTSTATUS FatSetRenameInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PVCB Vcb, IN PFCB Fcb, IN PCCB Ccb ) /*++ Routine Description: This routine performs the set name information for fat. It either completes the request or enqueues it off to the fsp. Arguments: Irp - Supplies the irp being processed Vcb - Supplies the Vcb being processed Fcb - Supplies the Fcb or Dcb being processed, already known not to be the root dcb Ccb - Supplies the Ccb corresponding to the handle opening the source file Return Value: NTSTATUS - The result of this operation if it completes without an exception. --*/ { BOOLEAN AllLowerComponent; BOOLEAN AllLowerExtension; BOOLEAN CaseOnlyRename; BOOLEAN ContinueWithRename; BOOLEAN CreateLfn; BOOLEAN DeleteSourceDirent; BOOLEAN DeleteTarget; BOOLEAN NewDirentFromPool; BOOLEAN RenamedAcrossDirectories; BOOLEAN ReplaceIfExists; CCB LocalCcb; PCCB SourceCcb; DIRENT SourceDirent; NTSTATUS Status; OEM_STRING OldOemName; OEM_STRING NewOemName; UCHAR OemNameBuffer[24*2]; PBCB DotDotBcb; PBCB NewDirentBcb; PBCB OldDirentBcb; PBCB SecondPageBcb; PBCB TargetDirentBcb; PDCB TargetDcb; PDCB OldParentDcb; PDIRENT DotDotDirent; PDIRENT FirstPageDirent; PDIRENT NewDirent; PDIRENT OldDirent; PDIRENT SecondPageDirent; PDIRENT ShortDirent; PDIRENT TargetDirent; PFCB TempFcb; PFILE_OBJECT TargetFileObject; PFILE_OBJECT FileObject; PIO_STACK_LOCATION IrpSp; PLIST_ENTRY Links; ULONG BytesInFirstPage; ULONG DirentsInFirstPage; ULONG DirentsRequired; ULONG NewOffset; ULONG NotifyAction; ULONG SecondPageOffset; ULONG ShortDirentOffset; ULONG TargetDirentOffset; ULONG TargetLfnOffset; UNICODE_STRING NewName; UNICODE_STRING NewUpcasedName; UNICODE_STRING OldName; UNICODE_STRING OldUpcasedName; UNICODE_STRING TargetLfn; PWCHAR UnicodeBuffer; UNICODE_STRING UniTunneledShortName; WCHAR UniTunneledShortNameBuffer[12]; UNICODE_STRING UniTunneledLongName; WCHAR UniTunneledLongNameBuffer[26]; LARGE_INTEGER TunneledCreationTime; ULONG TunneledDataSize; BOOLEAN HaveTunneledInformation; BOOLEAN UsingTunneledLfn = FALSE; BOOLEAN InvalidateFcbOnRaise = FALSE; DebugTrace(+1, Dbg, "FatSetRenameInfo...\n", 0); // // P H A S E 0: Initialize some variables. // CaseOnlyRename = FALSE; ContinueWithRename = FALSE; DeleteSourceDirent = FALSE; DeleteTarget = FALSE; NewDirentFromPool = FALSE; RenamedAcrossDirectories = FALSE; DotDotBcb = NULL; NewDirentBcb = NULL; OldDirentBcb = NULL; SecondPageBcb = NULL; TargetDirentBcb = NULL; NewOemName.Length = 0; NewOemName.MaximumLength = 24; NewOemName.Buffer = &OemNameBuffer[0]; OldOemName.Length = 0; OldOemName.MaximumLength = 24; OldOemName.Buffer = &OemNameBuffer[24]; UnicodeBuffer = FsRtlAllocatePoolWithTag( PagedPool, 4 * MAX_LFN_CHARACTERS * sizeof(WCHAR), TAG_FILENAME_BUFFER ); NewUpcasedName.Length = 0; NewUpcasedName.MaximumLength = MAX_LFN_CHARACTERS * sizeof(WCHAR); NewUpcasedName.Buffer = &UnicodeBuffer[0]; OldName.Length = 0; OldName.MaximumLength = MAX_LFN_CHARACTERS * sizeof(WCHAR); OldName.Buffer = &UnicodeBuffer[MAX_LFN_CHARACTERS]; OldUpcasedName.Length = 0; OldUpcasedName.MaximumLength = MAX_LFN_CHARACTERS * sizeof(WCHAR); OldUpcasedName.Buffer = &UnicodeBuffer[MAX_LFN_CHARACTERS * 2]; TargetLfn.Length = 0; TargetLfn.MaximumLength = MAX_LFN_CHARACTERS * sizeof(WCHAR); TargetLfn.Buffer = &UnicodeBuffer[MAX_LFN_CHARACTERS * 3]; UniTunneledShortName.Length = 0; UniTunneledShortName.MaximumLength = sizeof(UniTunneledShortNameBuffer); UniTunneledShortName.Buffer = &UniTunneledShortNameBuffer[0]; UniTunneledLongName.Length = 0; UniTunneledLongName.MaximumLength = sizeof(UniTunneledLongNameBuffer); UniTunneledLongName.Buffer = &UniTunneledLongNameBuffer[0]; // // Remember the name in case we have to modify the name // value in the ea. // RtlCopyMemory( OldOemName.Buffer, Fcb->ShortName.Name.Oem.Buffer, OldOemName.Length ); // // Get the current stack location // IrpSp = IoGetCurrentIrpStackLocation( Irp ); // // Extract information from the Irp to make our life easier // FileObject = IrpSp->FileObject; SourceCcb = FileObject->FsContext2; TargetFileObject = IrpSp->Parameters.SetFile.FileObject; ReplaceIfExists = IrpSp->Parameters.SetFile.ReplaceIfExists; RtlZeroMemory( &LocalCcb, sizeof(CCB) ); // // P H A S E 1: // // Test if rename is legal. Only small side-effects are not undone. // try { // // Can't rename the root directory // if ( NodeType(Fcb) == FAT_NTC_ROOT_DCB ) { try_return( Status = STATUS_INVALID_PARAMETER ); } // // Check that we were not given a dcb with open handles beneath // it. If there are only UncleanCount == 0 Fcbs beneath us, then // remove them from the prefix table, and they will just close // and go away naturally. // if (NodeType(Fcb) == FAT_NTC_DCB) { PFCB BatchOplockFcb; ULONG BatchOplockCount; // // Loop until there are no batch oplocks in the subtree below // this directory. // while (TRUE) { BatchOplockFcb = NULL; BatchOplockCount = 0; // // First look for any UncleanCount != 0 Fcbs, and fail if we // find any. // for ( TempFcb = FatGetNextFcbBottomUp(IrpContext, NULL, Fcb); TempFcb != Fcb; TempFcb = FatGetNextFcbBottomUp(IrpContext, TempFcb, Fcb) ) { if ( TempFcb->UncleanCount != 0 ) { // // If there is a batch oplock on this file then // increment our count and remember the Fcb if // this is the first. // if ( (NodeType(TempFcb) == FAT_NTC_FCB) && FsRtlCurrentBatchOplock( &TempFcb->Specific.Fcb.Oplock ) ) { BatchOplockCount += 1; if ( BatchOplockFcb == NULL ) { BatchOplockFcb = TempFcb; } } else { try_return( Status = STATUS_ACCESS_DENIED ); } } } // // If this is not the first pass for rename and the number // of batch oplocks has not decreased then give up. // if ( BatchOplockFcb != NULL ) { if ( (Irp->IoStatus.Information != 0) && (BatchOplockCount >= Irp->IoStatus.Information) ) { try_return( Status = STATUS_ACCESS_DENIED ); } // // Try to break this batch oplock. // Irp->IoStatus.Information = BatchOplockCount; Status = FsRtlCheckOplock( &BatchOplockFcb->Specific.Fcb.Oplock, Irp, IrpContext, FatOplockComplete, NULL ); // // If the oplock was already broken then look for more // batch oplocks. // if (Status == STATUS_SUCCESS) { continue; } // // Otherwise the oplock package will post or complete the // request. // try_return( Status = STATUS_PENDING ); } break; } // // Now try to get as many of these file object, and thus Fcbs // to go away as possible, flushing first, of course. // FatPurgeReferencedFileObjects( IrpContext, Fcb, TRUE ); // // OK, so there are no UncleanCount != 0, Fcbs. Infact, there // shouldn't really be any Fcbs left at all, except obstinate // ones from user mapped sections ....oh well, he shouldn't have // closed his handle if he wanted the file to stick around. So // remove any Fcbs beneath us from the splay table and mark them // DELETE_ON_CLOSE so that any future operations will fail. // for ( TempFcb = FatGetNextFcbBottomUp(IrpContext, NULL, Fcb); TempFcb != Fcb; TempFcb = FatGetNextFcbBottomUp(IrpContext, TempFcb, Fcb) ) { FatRemoveNames( IrpContext, TempFcb ); SetFlag( TempFcb->FcbState, FCB_STATE_DELETE_ON_CLOSE ); } } // // Check if this is a simple rename or a fully-qualified rename // In both cases we need to figure out what the TargetDcb, and // NewName are. // if (TargetFileObject == NULL) { // // In the case of a simple rename the target dcb is the // same as the source file's parent dcb, and the new file name // is taken from the system buffer // PFILE_RENAME_INFORMATION Buffer; Buffer = Irp->AssociatedIrp.SystemBuffer; TargetDcb = Fcb->ParentDcb; NewName.Length = (USHORT) Buffer->FileNameLength; NewName.Buffer = (PWSTR) &Buffer->FileName; // // Make sure the name is of legal length. // if (NewName.Length >= 255*sizeof(WCHAR)) { try_return( Status = STATUS_OBJECT_NAME_INVALID ); } } else { // // For a fully-qualified rename the target dcb is taken from // the target file object, which must be on the same vcb as // the source. // PVCB TargetVcb; PCCB TargetCcb; if ((FatDecodeFileObject( TargetFileObject, &TargetVcb, &TargetDcb, &TargetCcb ) != UserDirectoryOpen) || (TargetVcb != Vcb)) { try_return( Status = STATUS_INVALID_PARAMETER ); } // // This name is by definition legal. // NewName = *((PUNICODE_STRING)&TargetFileObject->FileName); } // // We will need an upcased version of the unicode name and the // old name as well. // Status = RtlUpcaseUnicodeString( &NewUpcasedName, &NewName, FALSE ); if (!NT_SUCCESS(Status)) { try_return( Status ); } FatGetUnicodeNameFromFcb( IrpContext, Fcb, &OldName ); Status = RtlUpcaseUnicodeString( &OldUpcasedName, &OldName, FALSE ); if (!NT_SUCCESS(Status)) { try_return(Status); } // // Check if the current name and new name are equal, and the // DCBs are equal. If they are then our work is already done. // if (TargetDcb == Fcb->ParentDcb) { // // OK, now if we found something then check if it was an exact // match or just a case match. If it was an exact match, then // we can bail here. // if (FsRtlAreNamesEqual( &NewName, &OldName, FALSE, NULL )) { try_return( Status = STATUS_SUCCESS ); } // // Check now for a case only rename. // if (FsRtlAreNamesEqual( &NewUpcasedName, &OldUpcasedName, FALSE, NULL )) { CaseOnlyRename = TRUE; } } else { RenamedAcrossDirectories = TRUE; } // // Upcase the name and convert it to the Oem code page. // // If the new UNICODE name is already more than 12 characters, // then we know the Oem name will not be valid // if (NewName.Length <= 12*sizeof(WCHAR)) { FatUnicodeToUpcaseOem( IrpContext, &NewOemName, &NewName ); // // If the name is not valid 8.3, zero the length. // if (FatSpaceInName( IrpContext, &NewName ) || !FatIsNameShortOemValid( IrpContext, NewOemName, FALSE, FALSE, FALSE)) { NewOemName.Length = 0; } } else { NewOemName.Length = 0; } // // Look in the tunnel cache for names and timestamps to restore // TunneledDataSize = sizeof(LARGE_INTEGER); HaveTunneledInformation = FsRtlFindInTunnelCache( &Vcb->Tunnel, FatDirectoryKey(TargetDcb), &NewName, &UniTunneledShortName, &UniTunneledLongName, &TunneledDataSize, &TunneledCreationTime ); ASSERT(TunneledDataSize == sizeof(LARGE_INTEGER)); // // Now we need to determine how many dirents this new name will // require. // if ((NewOemName.Length == 0) || (FatEvaluateNameCase( IrpContext, &NewName, &AllLowerComponent, &AllLowerExtension, &CreateLfn ), CreateLfn)) { DirentsRequired = FAT_LFN_DIRENTS_NEEDED(&NewName) + 1; } else { // // The user-given name is a short name, but we might still have // a tunneled long name we want to use. See if we can. // if (UniTunneledLongName.Length && !FatLfnDirentExists(IrpContext, TargetDcb, &UniTunneledLongName, &TargetLfn)) { UsingTunneledLfn = CreateLfn = TRUE; DirentsRequired = FAT_LFN_DIRENTS_NEEDED(&UniTunneledLongName) + 1; } else { // // This really is a simple dirent. Note that the two AllLower BOOLEANs // are correctly set now. // DirentsRequired = 1; } } // // Do some extra checks here if we are not in Chicago mode. // if (!FatData.ChicagoMode) { // // If the name was not 8.3 valid, fail the rename. // if (NewOemName.Length == 0) { try_return( Status = STATUS_OBJECT_NAME_INVALID ); } // // Don't use the magic bits. // AllLowerComponent = FALSE; AllLowerExtension = FALSE; CreateLfn = FALSE; UsingTunneledLfn = FALSE; } if (!CaseOnlyRename) { // // Check if the new name already exists, wait is known to be // true. // if (NewOemName.Length != 0) { FatStringTo8dot3( IrpContext, NewOemName, &LocalCcb.OemQueryTemplate.Constant ); } else { SetFlag( LocalCcb.Flags, CCB_FLAG_SKIP_SHORT_NAME_COMPARE ); } LocalCcb.UnicodeQueryTemplate = NewUpcasedName; LocalCcb.ContainsWildCards = FALSE; FatLocateDirent( IrpContext, TargetDcb, &LocalCcb, 0, &TargetDirent, &TargetDirentBcb, &TargetDirentOffset, NULL, &TargetLfn); if (TargetDirent != NULL) { // // The name already exists, check if the user wants // to overwrite the name, and has access to do the overwrite // We cannot overwrite a directory. // if ((!ReplaceIfExists) || (FlagOn(TargetDirent->Attributes, FAT_DIRENT_ATTR_DIRECTORY)) || (FlagOn(TargetDirent->Attributes, FAT_DIRENT_ATTR_READ_ONLY))) { try_return( Status = STATUS_OBJECT_NAME_COLLISION ); } // // Check that the file has no open user handles, if it does // then we will deny access. We do the check by searching // down the list of fcbs opened under our parent Dcb, and making // sure none of the maching Fcbs have a non-zero unclean count or // outstanding image sections. // for (Links = TargetDcb->Specific.Dcb.ParentDcbQueue.Flink; Links != &TargetDcb->Specific.Dcb.ParentDcbQueue; ) { TempFcb = CONTAINING_RECORD( Links, FCB, ParentDcbLinks ); // // Advance now. The image section flush may cause the final // close, which will recursively happen underneath of us here. // It would be unfortunate if we looked through free memory. // Links = Links->Flink; if ((TempFcb->DirentOffsetWithinDirectory == TargetDirentOffset) && ((TempFcb->UncleanCount != 0) || !MmFlushImageSection( &TempFcb->NonPaged->SectionObjectPointers, MmFlushForDelete))) { // // If there are batch oplocks on this file then break the // oplocks before failing the rename. // Status = STATUS_ACCESS_DENIED; if ((NodeType(TempFcb) == FAT_NTC_FCB) && FsRtlCurrentBatchOplock( &TempFcb->Specific.Fcb.Oplock )) { // // Do all of our cleanup now since the IrpContext // could go away when this request is posted. // FatUnpinBcb( IrpContext, TargetDirentBcb ); Status = FsRtlCheckOplock( &TempFcb->Specific.Fcb.Oplock, Irp, IrpContext, FatOplockComplete, NULL ); if (Status != STATUS_PENDING) { Status = STATUS_ACCESS_DENIED; } } try_return( NOTHING ); } } // // OK, this target is toast. Remember the Lfn offset. // TargetLfnOffset = TargetDirentOffset - FAT_LFN_DIRENTS_NEEDED(&TargetLfn) * sizeof(DIRENT); DeleteTarget = TRUE; } } // // If we will need more dirents than we have, allocate them now. // if ((TargetDcb != Fcb->ParentDcb) || (DirentsRequired != (Fcb->DirentOffsetWithinDirectory - Fcb->LfnOffsetWithinDirectory) / sizeof(DIRENT) + 1)) { // // Get some new allocation // NewOffset = FatCreateNewDirent( IrpContext, TargetDcb, DirentsRequired ); DeleteSourceDirent = TRUE; } else { NewOffset = Fcb->LfnOffsetWithinDirectory; } ContinueWithRename = TRUE; try_exit: NOTHING; } finally { if (!ContinueWithRename) { // // Undo everything from above. // ExFreePool( UnicodeBuffer ); FatUnpinBcb( IrpContext, TargetDirentBcb ); } } // // Now, if we are already done, return here. // if (!ContinueWithRename) { return Status; } // // P H A S E 2: Actually perform the rename. // try { // // Report the fact that we are going to remove this entry. // If we renamed within the same directory and the new name for the // file did not previously exist, we report this as a rename old // name. Otherwise this is a removed file. // if (!RenamedAcrossDirectories && !DeleteTarget) { NotifyAction = FILE_ACTION_RENAMED_OLD_NAME; } else { NotifyAction = FILE_ACTION_REMOVED; } FatNotifyReportChange( IrpContext, Vcb, Fcb, ((NodeType( Fcb ) == FAT_NTC_FCB) ? FILE_NOTIFY_CHANGE_FILE_NAME : FILE_NOTIFY_CHANGE_DIR_NAME ), NotifyAction ); // // Capture a copy of the source dirent. // FatGetDirentFromFcbOrDcb( IrpContext, Fcb, &OldDirent, &OldDirentBcb ); SourceDirent = *OldDirent; try { // // Tunnel the source Fcb - the names are disappearing regardless of // whether the dirent allocation physically changed // FatTunnelFcbOrDcb( Fcb, SourceCcb ); // // From here until very nearly the end of the operation, if we raise there // is no reasonable way to suppose we'd be able to undo the damage. Not // being a transactional filesystem, FAT is at the mercy of a lot of things // (as the astute reader has no doubt realized by now). // InvalidateFcbOnRaise = TRUE; // // Delete our current dirent(s) if we got a new one. // if (DeleteSourceDirent) { FatDeleteDirent( IrpContext, Fcb, NULL, FALSE ); } // // Delete a target conflict if we were meant to. // if (DeleteTarget) { FatDeleteFile( IrpContext, TargetDcb, TargetLfnOffset, TargetDirentOffset, TargetDirent, &TargetLfn ); } // // We need to evaluate any short names required. If there were any // conflicts in existing short names, they would have been deleted above. // // It isn't neccesary to worry about the UsingTunneledLfn case. Since we // actually already know whether CreateLfn will be set either NewName is // an Lfn and !UsingTunneledLfn is implied or NewName is a short name and // we can handle that externally. // FatSelectNames( IrpContext, TargetDcb, &NewOemName, &NewName, &NewOemName, (HaveTunneledInformation ? &UniTunneledShortName : NULL), &AllLowerComponent, &AllLowerExtension, &CreateLfn ); if (!CreateLfn && UsingTunneledLfn) { CreateLfn = TRUE; NewName = UniTunneledLongName; // // Short names are always upcase if an LFN exists // AllLowerComponent = FALSE; AllLowerExtension = FALSE; } // // OK, now setup the new dirent(s) for the new name. // FatPrepareWriteDirectoryFile( IrpContext, TargetDcb, NewOffset, sizeof(DIRENT), &NewDirentBcb, &NewDirent, FALSE, TRUE, &Status ); ASSERT( NT_SUCCESS( Status ) ); // // Deal with the special case of an LFN + Dirent structure crossing // a page boundry. // if ((NewOffset / PAGE_SIZE) != ((NewOffset + (DirentsRequired - 1) * sizeof(DIRENT)) / PAGE_SIZE)) { SecondPageOffset = (NewOffset & ~(PAGE_SIZE - 1)) + PAGE_SIZE; BytesInFirstPage = SecondPageOffset - NewOffset; DirentsInFirstPage = BytesInFirstPage / sizeof(DIRENT); FatPrepareWriteDirectoryFile( IrpContext, TargetDcb, SecondPageOffset, sizeof(DIRENT), &SecondPageBcb, &SecondPageDirent, FALSE, TRUE, &Status ); ASSERT( NT_SUCCESS( Status ) ); FirstPageDirent = NewDirent; NewDirent = FsRtlAllocatePoolWithTag( PagedPool, DirentsRequired * sizeof(DIRENT), TAG_DIRENT ); NewDirentFromPool = TRUE; } // // Bump up Dirent and DirentOffset // ShortDirent = NewDirent + DirentsRequired - 1; ShortDirentOffset = NewOffset + (DirentsRequired - 1) * sizeof(DIRENT); // // Fill in the fields of the dirent. // *ShortDirent = SourceDirent; FatConstructDirent( IrpContext, ShortDirent, &NewOemName, AllLowerComponent, AllLowerExtension, CreateLfn ? &NewName : NULL, SourceDirent.Attributes, FALSE, (HaveTunneledInformation ? &TunneledCreationTime : NULL) ); if (HaveTunneledInformation) { // // Need to go in and fix the timestamps in the FCB. Note that we can't use // the TunneledCreationTime since the conversions may have failed. // Fcb->CreationTime = FatFatTimeToNtTime(IrpContext, ShortDirent->CreationTime, ShortDirent->CreationMSec); Fcb->LastWriteTime = FatFatTimeToNtTime(IrpContext, ShortDirent->LastWriteTime, 0); Fcb->LastAccessTime = FatFatDateToNtTime(IrpContext, ShortDirent->LastAccessDate); } // // If the dirent crossed pages, split the contents of the // temporary pool between the two pages. // if (NewDirentFromPool) { RtlCopyMemory( FirstPageDirent, NewDirent, BytesInFirstPage ); RtlCopyMemory( SecondPageDirent, NewDirent + DirentsInFirstPage, DirentsRequired*sizeof(DIRENT) - BytesInFirstPage ); ShortDirent = SecondPageDirent + (DirentsRequired - DirentsInFirstPage) - 1; } } finally { // // Remove the entry from the splay table, and then remove the // full file name and exact case lfn. It is important that we // always remove the name from the prefix table regardless of // other errors. // FatRemoveNames( IrpContext, Fcb ); if (Fcb->FullFileName.Buffer != NULL) { ExFreePool( Fcb->FullFileName.Buffer ); Fcb->FullFileName.Buffer = NULL; } if (Fcb->ExactCaseLongName.Buffer) { ExFreePool( Fcb->ExactCaseLongName.Buffer ); Fcb->ExactCaseLongName.Buffer = NULL; } } // // Now we need to update the location of the file's directory // offset and move the fcb from its current parent dcb to // the target dcb. // Fcb->LfnOffsetWithinDirectory = NewOffset; Fcb->DirentOffsetWithinDirectory = ShortDirentOffset; RemoveEntryList( &Fcb->ParentDcbLinks ); // // There is a deep reason we put files on the tail, others on the head, // which is to allow us to easily enumerate all child directories before // child files. This is important to let us maintain whole-volume lockorder // via BottomUp enumeration. // if (NodeType(Fcb) == FAT_NTC_FCB) { InsertTailList( &TargetDcb->Specific.Dcb.ParentDcbQueue, &Fcb->ParentDcbLinks ); } else { InsertHeadList( &TargetDcb->Specific.Dcb.ParentDcbQueue, &Fcb->ParentDcbLinks ); } OldParentDcb = Fcb->ParentDcb; Fcb->ParentDcb = TargetDcb; // // If we renamed across directories, some cleanup is now in order. // if (RenamedAcrossDirectories) { // // See if we need to uninitialize the cachemap for the source directory. // Do this now in case we get unlucky and raise trying to finalize the // operation. // if (IsListEmpty(&OldParentDcb->Specific.Dcb.ParentDcbQueue) && (OldParentDcb->OpenCount == 0) && (OldParentDcb->Specific.Dcb.DirectoryFile != NULL)) { PFILE_OBJECT DirectoryFileObject; ASSERT( NodeType(OldParentDcb) == FAT_NTC_DCB ); DirectoryFileObject = OldParentDcb->Specific.Dcb.DirectoryFile; DebugTrace(0, Dbg, "Uninitialize our parent Stream Cache Map\n", 0); CcUninitializeCacheMap( DirectoryFileObject, NULL, NULL ); OldParentDcb->Specific.Dcb.DirectoryFile = NULL; ObDereferenceObject( DirectoryFileObject ); } // // If we move a directory across directories, we have to change // the cluster number in its .. entry // if (NodeType(Fcb) == FAT_NTC_DCB) { FatPrepareWriteDirectoryFile( IrpContext, Fcb, sizeof(DIRENT), sizeof(DIRENT), &DotDotBcb, &DotDotDirent, FALSE, TRUE, &Status ); ASSERT( NT_SUCCESS( Status ) ); DotDotDirent->FirstClusterOfFile = (USHORT) ( NodeType(TargetDcb) == FAT_NTC_ROOT_DCB ? 0 : TargetDcb->FirstClusterOfFile); if (FatIsFat32( Vcb )) { DotDotDirent->FirstClusterOfFileHi = (USHORT) ( NodeType( TargetDcb ) == FAT_NTC_ROOT_DCB ? 0 : (TargetDcb->FirstClusterOfFile >> 16)); } } } // // Now we need to setup the splay table and the name within // the fcb. Free the old short name at this point. // ExFreePool( Fcb->ShortName.Name.Oem.Buffer ); Fcb->ShortName.Name.Oem.Buffer = NULL; FatConstructNamesInFcb( IrpContext, Fcb, ShortDirent, CreateLfn ? &NewName : NULL ); FatSetFullNameInFcb( IrpContext, Fcb, &NewName ); // // The rest of the actions taken are not related to correctness of // the in-memory structures, so we shouldn't toast the Fcb if we // raise from here to the end. // InvalidateFcbOnRaise = FALSE; // // If a file, set the file as modified so that the archive bit // is set. We prevent this from adjusting the write time by // indicating the user flag in the ccb. // if (Fcb->Header.NodeTypeCode == FAT_NTC_FCB) { SetFlag( FileObject->Flags, FO_FILE_MODIFIED ); SetFlag( Ccb->Flags, CCB_FLAG_USER_SET_LAST_WRITE ); } // // We have three cases to report. // // 1. If we overwrote an existing file, we report this as // a modified file. // // 2. If we renamed to a new directory, then we added a file. // // 3. If we renamed in the same directory, then we report the // the renamednewname. // if (DeleteTarget) { FatNotifyReportChange( IrpContext, Vcb, Fcb, FILE_NOTIFY_CHANGE_ATTRIBUTES | FILE_NOTIFY_CHANGE_SIZE | FILE_NOTIFY_CHANGE_LAST_WRITE | FILE_NOTIFY_CHANGE_LAST_ACCESS | FILE_NOTIFY_CHANGE_CREATION | FILE_NOTIFY_CHANGE_EA, FILE_ACTION_MODIFIED ); } else if (RenamedAcrossDirectories) { FatNotifyReportChange( IrpContext, Vcb, Fcb, ((NodeType( Fcb ) == FAT_NTC_FCB) ? FILE_NOTIFY_CHANGE_FILE_NAME : FILE_NOTIFY_CHANGE_DIR_NAME ), FILE_ACTION_ADDED ); } else { FatNotifyReportChange( IrpContext, Vcb, Fcb, ((NodeType( Fcb ) == FAT_NTC_FCB) ? FILE_NOTIFY_CHANGE_FILE_NAME : FILE_NOTIFY_CHANGE_DIR_NAME ), FILE_ACTION_RENAMED_NEW_NAME ); } // // We need to update the file name in the dirent. This value // is never used elsewhere, so we don't concern ourselves // with any error we may encounter. We let chkdsk fix the // disk at some later time. // if (!FatIsFat32(Vcb) && ShortDirent->ExtendedAttributes != 0) { FatRenameEAs( IrpContext, Fcb, ShortDirent->ExtendedAttributes, &OldOemName ); } // // Set our final status // Status = STATUS_SUCCESS; } finally { DebugUnwind( FatSetRenameInfo ); ExFreePool( UnicodeBuffer ); if (UniTunneledLongName.Buffer != UniTunneledLongNameBuffer) { // // Free pool if the buffer was grown on tunneling lookup // ExFreePool(UniTunneledLongName.Buffer); } FatUnpinBcb( IrpContext, OldDirentBcb ); FatUnpinBcb( IrpContext, TargetDirentBcb ); FatUnpinBcb( IrpContext, NewDirentBcb ); FatUnpinBcb( IrpContext, SecondPageBcb ); FatUnpinBcb( IrpContext, DotDotBcb ); // // If this was an abnormal termination, then we are in trouble. // Should the operation have been in a sensitive state there is // nothing we can do but invalidate the Fcb. // if (AbnormalTermination() && InvalidateFcbOnRaise) { Fcb->FcbCondition = FcbBad; } DebugTrace(-1, Dbg, "FatSetRenameInfo -> %08lx\n", Status); } return Status; } // // Internal Support Routine // NTSTATUS FatSetPositionInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PFILE_OBJECT FileObject ) /*++ Routine Description: This routine performs the set position information for fat. It either completes the request or enqueues it off to the fsp. Arguments: Irp - Supplies the irp being processed FileObject - Supplies the file object being processed Return Value: NTSTATUS - The result of this operation if it completes without an exception. --*/ { PFILE_POSITION_INFORMATION Buffer; DebugTrace(+1, Dbg, "FatSetPositionInfo...\n", 0); Buffer = Irp->AssociatedIrp.SystemBuffer; // // Check if the file does not use intermediate buffering. If it // does not use intermediate buffering then the new position we're // supplied must be aligned properly for the device // if (FlagOn( FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING )) { PDEVICE_OBJECT DeviceObject; DeviceObject = IoGetCurrentIrpStackLocation( Irp )->DeviceObject; if ((Buffer->CurrentByteOffset.LowPart & DeviceObject->AlignmentRequirement) != 0) { DebugTrace(0, Dbg, "Cannot set position due to aligment conflict\n", 0); DebugTrace(-1, Dbg, "FatSetPositionInfo -> %08lx\n", STATUS_INVALID_PARAMETER); return STATUS_INVALID_PARAMETER; } } // // The input parameter is fine so set the current byte offset and // complete the request // DebugTrace(0, Dbg, "Set the new position to %08lx\n", Buffer->CurrentByteOffset); FileObject->CurrentByteOffset = Buffer->CurrentByteOffset; DebugTrace(-1, Dbg, "FatSetPositionInfo -> %08lx\n", STATUS_SUCCESS); UNREFERENCED_PARAMETER( IrpContext ); return STATUS_SUCCESS; } // // Internal Support Routine // NTSTATUS FatSetAllocationInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PFCB Fcb, IN PFILE_OBJECT FileObject ) /*++ Routine Description: This routine performs the set Allocation information for fat. It either completes the request or enqueues it off to the fsp. Arguments: Irp - Supplies the irp being processed Fcb - Supplies the Fcb or Dcb being processed, already known not to be the root dcb FileObject - Supplies the FileObject being processed, already known not to be the root dcb Return Value: NTSTATUS - The result of this operation if it completes without an exception. --*/ { NTSTATUS Status = STATUS_SUCCESS; PFILE_ALLOCATION_INFORMATION Buffer; ULONG NewAllocationSize; BOOLEAN FileSizeTruncated = FALSE; BOOLEAN CacheMapInitialized = FALSE; BOOLEAN ResourceAcquired = FALSE; ULONG OriginalFileSize; ULONG OriginalValidDataLength; ULONG OriginalValidDataToDisk; Buffer = Irp->AssociatedIrp.SystemBuffer; NewAllocationSize = Buffer->AllocationSize.LowPart; DebugTrace(+1, Dbg, "FatSetAllocationInfo.. to %08lx\n", NewAllocationSize); // // Allocation is only allowed on a file and not a directory // if (NodeType(Fcb) == FAT_NTC_DCB) { DebugTrace(-1, Dbg, "Cannot change allocation of a directory\n", 0); return STATUS_INVALID_DEVICE_REQUEST; } // // Check that the new file allocation is legal // if (!FatIsIoRangeValid( Fcb->Vcb, Buffer->AllocationSize, 0 )) { DebugTrace(-1, Dbg, "Illegal allocation size\n", 0); return STATUS_DISK_FULL; } // // If we haven't yet looked up the correct AllocationSize, do so. // if (Fcb->Header.AllocationSize.QuadPart == FCB_LOOKUP_ALLOCATIONSIZE_HINT) { FatLookupFileAllocationSize( IrpContext, Fcb ); } // // This is kinda gross, but if the file is not cached, but there is // a data section, we have to cache the file to avoid a bunch of // extra work. // if ((FileObject->SectionObjectPointer->DataSectionObject != NULL) && (FileObject->SectionObjectPointer->SharedCacheMap == NULL) && !FlagOn(Irp->Flags, IRP_PAGING_IO)) { ASSERT( !FlagOn( FileObject->Flags, FO_CLEANUP_COMPLETE ) ); // // Now initialize the cache map. // CcInitializeCacheMap( FileObject, (PCC_FILE_SIZES)&Fcb->Header.AllocationSize, FALSE, &FatData.CacheManagerCallbacks, Fcb ); CacheMapInitialized = TRUE; } // // Now mark the fact that the file needs to be truncated on close // Fcb->FcbState |= FCB_STATE_TRUNCATE_ON_CLOSE; // // Now mark that the time on the dirent needs to be updated on close. // SetFlag( FileObject->Flags, FO_FILE_MODIFIED ); try { // // Increase or decrease the allocation size. // if (NewAllocationSize > Fcb->Header.AllocationSize.LowPart) { FatAddFileAllocation( IrpContext, Fcb, FileObject, NewAllocationSize); } else { // // Check here if we will be decreasing file size and synchonize with // paging IO. // if ( Fcb->Header.FileSize.LowPart > NewAllocationSize ) { // // Before we actually truncate, check to see if the purge // is going to fail. // if (!MmCanFileBeTruncated( FileObject->SectionObjectPointer, &Buffer->AllocationSize )) { try_return( Status = STATUS_USER_MAPPED_FILE ); } FileSizeTruncated = TRUE; OriginalFileSize = Fcb->Header.FileSize.LowPart; OriginalValidDataLength = Fcb->Header.ValidDataLength.LowPart; OriginalValidDataToDisk = Fcb->ValidDataToDisk; (VOID)ExAcquireResourceExclusiveLite( Fcb->Header.PagingIoResource, TRUE ); ResourceAcquired = TRUE; Fcb->Header.FileSize.LowPart = NewAllocationSize; // // If we reduced the file size to less than the ValidDataLength, // adjust the VDL. Likewise ValidDataToDisk. // if (Fcb->Header.ValidDataLength.LowPart > Fcb->Header.FileSize.LowPart) { Fcb->Header.ValidDataLength.LowPart = Fcb->Header.FileSize.LowPart; } if (Fcb->ValidDataToDisk > Fcb->Header.FileSize.LowPart) { Fcb->ValidDataToDisk = Fcb->Header.FileSize.LowPart; } } // // Now that File Size is down, actually do the truncate. // FatTruncateFileAllocation( IrpContext, Fcb, NewAllocationSize); // // Now check if we needed to decrease the file size accordingly. // if ( FileSizeTruncated ) { // // Tell the cache manager we reduced the file size. // The call is unconditional, because MM always wants to know. // #if DBG try { #endif CcSetFileSizes( FileObject, (PCC_FILE_SIZES)&Fcb->Header.AllocationSize ); #if DBG } except(FatBugCheckExceptionFilter( GetExceptionInformation() )) { NOTHING; } #endif ASSERT( FileObject->DeleteAccess || FileObject->WriteAccess ); // // There is no going back from this. If we run into problems updating // the dirent we will have to live with the consequences. Not sending // the notifies is likewise pretty benign compared to failing the entire // operation and trying to back out everything, which could fail for the // same reasons. // // If you want a transacted filesystem, use NTFS ... // FileSizeTruncated = FALSE; FatSetFileSizeInDirent( IrpContext, Fcb, NULL ); // // Report that we just reduced the file size. // FatNotifyReportChange( IrpContext, Fcb->Vcb, Fcb, FILE_NOTIFY_CHANGE_SIZE, FILE_ACTION_MODIFIED ); } } try_exit: NOTHING; } finally { if ( AbnormalTermination() && FileSizeTruncated ) { Fcb->Header.FileSize.LowPart = OriginalFileSize; Fcb->Header.ValidDataLength.LowPart = OriginalValidDataLength; Fcb->ValidDataToDisk = OriginalValidDataToDisk; // // Make sure Cc knows the right filesize. // if (FileObject->SectionObjectPointer->SharedCacheMap != NULL) { *CcGetFileSizePointer(FileObject) = Fcb->Header.FileSize; } ASSERT( Fcb->Header.FileSize.LowPart <= Fcb->Header.AllocationSize.LowPart ); } if (CacheMapInitialized) { CcUninitializeCacheMap( FileObject, NULL, NULL ); } if (ResourceAcquired) { ExReleaseResourceLite( Fcb->Header.PagingIoResource ); } } DebugTrace(-1, Dbg, "FatSetAllocationInfo -> %08lx\n", STATUS_SUCCESS); return Status; } // // Internal Support Routine // NTSTATUS FatSetEndOfFileInfo ( IN PIRP_CONTEXT IrpContext, IN PIRP Irp, IN PFILE_OBJECT FileObject, IN PVCB Vcb, IN PFCB Fcb ) /*++ Routine Description: This routine performs the set End of File information for fat. It either completes the request or enqueues it off to the fsp. Arguments: Irp - Supplies the irp being processed FileObject - Supplies the file object being processed Vcb - Supplies the Vcb being processed Fcb - Supplies the Fcb or Dcb being processed, already known not to be the root dcb Return Value: NTSTATUS - The result of this operation if it completes without an exception. --*/ { NTSTATUS Status; PFILE_END_OF_FILE_INFORMATION Buffer; ULONG NewFileSize; ULONG InitialFileSize; ULONG InitialValidDataLength; ULONG InitialValidDataToDisk; BOOLEAN CacheMapInitialized = FALSE; BOOLEAN UnwindFileSizes = FALSE; BOOLEAN ResourceAcquired = FALSE; DebugTrace(+1, Dbg, "FatSetEndOfFileInfo...\n", 0); Buffer = Irp->AssociatedIrp.SystemBuffer; try { // // File Size changes are only allowed on a file and not a directory // if (NodeType(Fcb) != FAT_NTC_FCB) { DebugTrace(0, Dbg, "Cannot change size of a directory\n", 0); try_return( Status = STATUS_INVALID_DEVICE_REQUEST ); } // // Check that the new file size is legal // if (!FatIsIoRangeValid( Fcb->Vcb, Buffer->EndOfFile, 0 )) { DebugTrace(0, Dbg, "Illegal allocation size\n", 0); try_return( Status = STATUS_DISK_FULL ); } NewFileSize = Buffer->EndOfFile.LowPart; // // If we haven't yet looked up the correct AllocationSize, do so. // if (Fcb->Header.AllocationSize.QuadPart == FCB_LOOKUP_ALLOCATIONSIZE_HINT) { FatLookupFileAllocationSize( IrpContext, Fcb ); } // // This is kinda gross, but if the file is not cached, but there is // a data section, we have to cache the file to avoid a bunch of // extra work. // if ((FileObject->SectionObjectPointer->DataSectionObject != NULL) && (FileObject->SectionObjectPointer->SharedCacheMap == NULL) && !FlagOn(Irp->Flags, IRP_PAGING_IO)) { if (FlagOn( FileObject->Flags, FO_CLEANUP_COMPLETE )) { // // This IRP has raced (and lost) with a close (=>cleanup) // on the same fileobject. We don't want to reinitialise the // cachemap here now because we'll leak it (unless we do so & // then tear it down again here, which is too much of a change at // this stage). So we'll just say the file is closed - which // is arguably the right thing to do anyway, since a caller // racing operations in this way is broken. The only stumbling // block is possibly filters - do they operate on cleaned // up fileobjects? // FatRaiseStatus( IrpContext, STATUS_FILE_CLOSED); } // // Now initialize the cache map. // CcInitializeCacheMap( FileObject, (PCC_FILE_SIZES)&Fcb->Header.AllocationSize, FALSE, &FatData.CacheManagerCallbacks, Fcb ); CacheMapInitialized = TRUE; } // // Do a special case here for the lazy write of file sizes. // if (IoGetCurrentIrpStackLocation(Irp)->Parameters.SetFile.AdvanceOnly) { // // Only attempt this if the file hasn't been "deleted on close" and // this is a good FCB. // if (!IsFileDeleted( IrpContext, Fcb ) && (Fcb->FcbCondition == FcbGood)) { PDIRENT Dirent; PBCB DirentBcb; // // Never have the dirent filesize larger than the fcb filesize // if (NewFileSize >= Fcb->Header.FileSize.LowPart) { NewFileSize = Fcb->Header.FileSize.LowPart; } // // Make sure we don't set anything higher than the alloc size. // ASSERT( NewFileSize <= Fcb->Header.AllocationSize.LowPart ); // // Only advance the file size, never reduce it with this call // FatGetDirentFromFcbOrDcb( IrpContext, Fcb, &Dirent, &DirentBcb ); ASSERT( Dirent && DirentBcb ); try { if ( NewFileSize > Dirent->FileSize ) { Dirent->FileSize = NewFileSize; FatSetDirtyBcb( IrpContext, DirentBcb, Fcb->Vcb, TRUE ); // // Report that we just changed the file size. // FatNotifyReportChange( IrpContext, Vcb, Fcb, FILE_NOTIFY_CHANGE_SIZE, FILE_ACTION_MODIFIED ); } } finally { FatUnpinBcb( IrpContext, DirentBcb ); } } else { DebugTrace(0, Dbg, "Cannot set size on deleted file.\n", 0); } try_return( Status = STATUS_SUCCESS ); } // // Check if the new file size is greater than the current // allocation size. If it is then we need to increase the // allocation size. // if ( NewFileSize > Fcb->Header.AllocationSize.LowPart ) { // // Change the file allocation // FatAddFileAllocation( IrpContext, Fcb, FileObject, NewFileSize ); } // // At this point we have enough allocation for the file. // So check if we are really changing the file size // if (Fcb->Header.FileSize.LowPart != NewFileSize) { if ( NewFileSize < Fcb->Header.FileSize.LowPart ) { // // Before we actually truncate, check to see if the purge // is going to fail. // if (!MmCanFileBeTruncated( FileObject->SectionObjectPointer, &Buffer->EndOfFile )) { try_return( Status = STATUS_USER_MAPPED_FILE ); } // // This call is unconditional, because MM always wants to know. // Also serialize here with paging io since we are truncating // the file size. // ResourceAcquired = ExAcquireResourceExclusiveLite( Fcb->Header.PagingIoResource, TRUE ); } // // Set the new file size // InitialFileSize = Fcb->Header.FileSize.LowPart; InitialValidDataLength = Fcb->Header.ValidDataLength.LowPart; InitialValidDataToDisk = Fcb->ValidDataToDisk; UnwindFileSizes = TRUE; Fcb->Header.FileSize.LowPart = NewFileSize; // // If we reduced the file size to less than the ValidDataLength, // adjust the VDL. Likewise ValidDataToDisk. // if (Fcb->Header.ValidDataLength.LowPart > NewFileSize) { Fcb->Header.ValidDataLength.LowPart = NewFileSize; } if (Fcb->ValidDataToDisk > NewFileSize) { Fcb->ValidDataToDisk = NewFileSize; } DebugTrace(0, Dbg, "New file size is 0x%08lx.\n", NewFileSize); // // We must now update the cache mapping (benign if not cached). // CcSetFileSizes( FileObject, (PCC_FILE_SIZES)&Fcb->Header.AllocationSize ); FatSetFileSizeInDirent( IrpContext, Fcb, NULL ); // // Report that we just changed the file size. // FatNotifyReportChange( IrpContext, Vcb, Fcb, FILE_NOTIFY_CHANGE_SIZE, FILE_ACTION_MODIFIED ); // // Mark the fact that the file will need to checked for // truncation on cleanup. // SetFlag( Fcb->FcbState, FCB_STATE_TRUNCATE_ON_CLOSE ); } // // Set this handle as having modified the file // FileObject->Flags |= FO_FILE_MODIFIED; // // Set our return status to success // Status = STATUS_SUCCESS; try_exit: NOTHING; FatUnpinRepinnedBcbs( IrpContext ); } finally { DebugUnwind( FatSetEndOfFileInfo ); if (AbnormalTermination() && UnwindFileSizes) { Fcb->Header.FileSize.LowPart = InitialFileSize; Fcb->Header.ValidDataLength.LowPart = InitialValidDataLength; Fcb->ValidDataToDisk = InitialValidDataToDisk; if (FileObject->SectionObjectPointer->SharedCacheMap != NULL) { *CcGetFileSizePointer(FileObject) = Fcb->Header.FileSize; } } if (CacheMapInitialized) { CcUninitializeCacheMap( FileObject, NULL, NULL ); } if ( ResourceAcquired ) { ExReleaseResourceLite( Fcb->Header.PagingIoResource ); } DebugTrace(-1, Dbg, "FatSetEndOfFileInfo -> %08lx\n", Status); } return Status; } // // Internal Support Routine // VOID FatDeleteFile ( IN PIRP_CONTEXT IrpContext, IN PDCB TargetDcb, IN ULONG LfnOffset, IN ULONG DirentOffset, IN PDIRENT Dirent, IN PUNICODE_STRING Lfn ) { PFCB Fcb; PLIST_ENTRY Links; // // We can do the replace by removing the other Fcb(s) from // the prefix table. // for (Links = TargetDcb->Specific.Dcb.ParentDcbQueue.Flink; Links != &TargetDcb->Specific.Dcb.ParentDcbQueue; Links = Links->Flink) { Fcb = CONTAINING_RECORD( Links, FCB, ParentDcbLinks ); if (FlagOn(Fcb->FcbState, FCB_STATE_NAMES_IN_SPLAY_TREE) && (Fcb->DirentOffsetWithinDirectory == DirentOffset)) { ASSERT( NodeType(Fcb) == FAT_NTC_FCB ); ASSERT( Fcb->LfnOffsetWithinDirectory == LfnOffset ); if ( Fcb->UncleanCount != 0 ) { FatBugCheck(0,0,0); } else { PERESOURCE Resource; // // Make this fcb "appear" deleted, synchronizing with // paging IO. // FatRemoveNames( IrpContext, Fcb ); Resource = Fcb->Header.PagingIoResource; (VOID)ExAcquireResourceExclusiveLite( Resource, TRUE ); SetFlag(Fcb->FcbState, FCB_STATE_DELETE_ON_CLOSE); Fcb->ValidDataToDisk = 0; Fcb->Header.FileSize.QuadPart = Fcb->Header.ValidDataLength.QuadPart = 0; Fcb->FirstClusterOfFile = 0; ExReleaseResourceLite( Resource ); } } } // // The file is not currently opened so we can delete the file // that is being overwritten. To do the operation we dummy // up an fcb, truncate allocation, delete the fcb, and delete // the dirent. // Fcb = FatCreateFcb( IrpContext, TargetDcb->Vcb, TargetDcb, LfnOffset, DirentOffset, Dirent, Lfn, FALSE, FALSE ); Fcb->Header.FileSize.LowPart = 0; try { FatTruncateFileAllocation( IrpContext, Fcb, 0 ); FatDeleteDirent( IrpContext, Fcb, NULL, TRUE ); } finally { FatDeleteFcb( IrpContext, Fcb ); } } // // Internal Support Routine // VOID FatRenameEAs ( IN PIRP_CONTEXT IrpContext, IN PFCB Fcb, IN USHORT ExtendedAttributes, IN POEM_STRING OldOemName ) { BOOLEAN LockedEaFcb = FALSE; PBCB EaBcb = NULL; PDIRENT EaDirent; EA_RANGE EaSetRange; PEA_SET_HEADER EaSetHeader; PVCB Vcb; RtlZeroMemory( &EaSetRange, sizeof( EA_RANGE )); Vcb = Fcb->Vcb; try { // // Use a try-except to catch any errors. // try { // // Try to get the Ea file object. Return FALSE on failure. // FatGetEaFile( IrpContext, Vcb, &EaDirent, &EaBcb, FALSE, FALSE ); LockedEaFcb = TRUE; // // If we didn't get the file because it doesn't exist, then the // disk is corrupted. We do nothing here. // if (Vcb->VirtualEaFile != NULL) { // // Try to pin down the Ea set header for the index in the // dirent. If the operation doesn't complete, return FALSE // from this routine. // FatReadEaSet( IrpContext, Vcb, ExtendedAttributes, OldOemName, FALSE, &EaSetRange ); EaSetHeader = (PEA_SET_HEADER) EaSetRange.Data; // // We now have the Ea set header for this file. We simply // overwrite the owning file name. // RtlZeroMemory( EaSetHeader->OwnerFileName, 14 ); RtlCopyMemory( EaSetHeader->OwnerFileName, Fcb->ShortName.Name.Oem.Buffer, Fcb->ShortName.Name.Oem.Length ); FatMarkEaRangeDirty( IrpContext, Vcb->VirtualEaFile, &EaSetRange ); FatUnpinEaRange( IrpContext, &EaSetRange ); CcFlushCache( Vcb->VirtualEaFile->SectionObjectPointer, NULL, 0, NULL ); } } except(FatExceptionFilter( IrpContext, GetExceptionInformation() )) { // // We catch all exceptions that Fat catches, but don't do // anything with them. // } } finally { // // Unpin the EaDirent and the EaSetHeader if pinned. // FatUnpinBcb( IrpContext, EaBcb ); FatUnpinEaRange( IrpContext, &EaSetRange ); // // Release the Fcb for the Ea file if locked. // if (LockedEaFcb) { FatReleaseFcb( IrpContext, Vcb->EaFcb ); } } return; }