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![Pierre Schweitzer](/assets/img/avatar_default.png)
This implies that a sample for W10. It has been backported to NT5.2; not sure how it would work on a W2K3 (feel free to test!)
1372 lines
33 KiB
C
1372 lines
33 KiB
C
/*++
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Copyright (c) 1989-2000 Microsoft Corporation
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Module Name:
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Flush.c
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Abstract:
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This module implements the File Flush buffers routine for Fat called by the
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dispatch driver.
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--*/
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#include "fatprocs.h"
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//
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// The Bug check file id for this module
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//
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#define BugCheckFileId (FAT_BUG_CHECK_FLUSH)
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//
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// The local debug trace level
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//
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#define Dbg (DEBUG_TRACE_FLUSH)
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, FatCommonFlushBuffers)
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#pragma alloc_text(PAGE, FatFlushDirectory)
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#pragma alloc_text(PAGE, FatFlushFat)
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#pragma alloc_text(PAGE, FatFlushFile)
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#pragma alloc_text(PAGE, FatFlushVolume)
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#pragma alloc_text(PAGE, FatFsdFlushBuffers)
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#pragma alloc_text(PAGE, FatFlushDirentForFile)
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#pragma alloc_text(PAGE, FatFlushFatEntries)
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#pragma alloc_text(PAGE, FatHijackIrpAndFlushDevice)
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#endif
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//
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// Local procedure prototypes
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//
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IO_COMPLETION_ROUTINE FatFlushCompletionRoutine;
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NTSTATUS
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NTAPI
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FatFlushCompletionRoutine (
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_In_ PDEVICE_OBJECT DeviceObject,
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_In_ PIRP Irp,
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_In_reads_opt_(_Inexpressible_("varies")) PVOID Contxt
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);
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IO_COMPLETION_ROUTINE FatHijackCompletionRoutine;
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NTSTATUS
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NTAPI
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FatHijackCompletionRoutine (
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_In_ PDEVICE_OBJECT DeviceObject,
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_In_ PIRP Irp,
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_In_reads_opt_(_Inexpressible_("varies")) PVOID Contxt
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);
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_Function_class_(IRP_MJ_FLUSH_BUFFERS)
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_Function_class_(DRIVER_DISPATCH)
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NTSTATUS
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NTAPI
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FatFsdFlushBuffers (
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_In_ PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
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_Inout_ PIRP Irp
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)
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/*++
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Routine Description:
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This routine implements the FSD part of Flush buffers.
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Arguments:
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VolumeDeviceObject - Supplies the volume device object where the
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file being flushed exists
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Irp - Supplies the Irp being processed
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Return Value:
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NTSTATUS - The FSD status for the IRP
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--*/
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{
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NTSTATUS Status;
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PIRP_CONTEXT IrpContext = NULL;
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BOOLEAN TopLevel;
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PAGED_CODE();
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DebugTrace(+1, Dbg, "FatFsdFlushBuffers\n", 0);
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//
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// Call the common Cleanup routine, with blocking allowed if synchronous
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//
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FsRtlEnterFileSystem();
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TopLevel = FatIsIrpTopLevel( Irp );
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_SEH2_TRY {
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IrpContext = FatCreateIrpContext( Irp, CanFsdWait( Irp ) );
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Status = FatCommonFlushBuffers( IrpContext, Irp );
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} _SEH2_EXCEPT(FatExceptionFilter( IrpContext, _SEH2_GetExceptionInformation() )) {
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//
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// We had some trouble trying to perform the requested
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// operation, so we'll abort the I/O request with
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// the error status that we get back from the
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// execption code
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//
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Status = FatProcessException( IrpContext, Irp, _SEH2_GetExceptionCode() );
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} _SEH2_END;
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if (TopLevel) { IoSetTopLevelIrp( NULL ); }
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FsRtlExitFileSystem();
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//
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// And return to our caller
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//
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DebugTrace(-1, Dbg, "FatFsdFlushBuffers -> %08lx\n", Status);
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UNREFERENCED_PARAMETER( VolumeDeviceObject );
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return Status;
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}
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_Requires_lock_held_(_Global_critical_region_)
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NTSTATUS
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FatCommonFlushBuffers (
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IN PIRP_CONTEXT IrpContext,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This is the common routine for flushing a buffer.
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Arguments:
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Irp - Supplies the Irp to process
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Return Value:
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NTSTATUS - The return status for the operation
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--*/
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{
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NTSTATUS Status;
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PIO_STACK_LOCATION IrpSp;
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PFILE_OBJECT FileObject;
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TYPE_OF_OPEN TypeOfOpen;
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PVCB Vcb;
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PFCB Fcb;
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PFCB NextFcb;
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PCCB Ccb;
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BOOLEAN VcbAcquired = FALSE;
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BOOLEAN FcbAcquired = FALSE;
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BOOLEAN FatFlushRequired = FALSE;
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PAGED_CODE();
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IrpSp = IoGetCurrentIrpStackLocation( Irp );
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DebugTrace(+1, Dbg, "FatCommonFlushBuffers\n", 0);
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DebugTrace( 0, Dbg, "Irp = %p\n", Irp);
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DebugTrace( 0, Dbg, "->FileObject = %p\n", IrpSp->FileObject);
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//
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// Extract and decode the file object
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//
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FileObject = IrpSp->FileObject;
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TypeOfOpen = FatDecodeFileObject( FileObject, &Vcb, &Fcb, &Ccb );
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//
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// CcFlushCache is always synchronous, so if we can't wait enqueue
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// the irp to the Fsp.
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//
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if ( !FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) ) {
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Status = FatFsdPostRequest( IrpContext, Irp );
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DebugTrace(-1, Dbg, "FatCommonFlushBuffers -> %08lx\n", Status );
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return Status;
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}
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Status = STATUS_SUCCESS;
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_SEH2_TRY {
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#if (NTDDI_VERSION >= NTDDI_WIN8)
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if (FatDiskAccountingEnabled) {
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PETHREAD OriginatingThread = NULL;
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//
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// Charge the flush to the originating thread.
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// Try the Thread in Irp's tail first, if that is NULL, then charge
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// the flush to current thread.
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//
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if ((Irp->Tail.Overlay.Thread != NULL) &&
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!IoIsSystemThread( Irp->Tail.Overlay.Thread )) {
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OriginatingThread = Irp->Tail.Overlay.Thread;
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} else {
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OriginatingThread = PsGetCurrentThread();
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}
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NT_ASSERT( OriginatingThread != NULL );
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PsUpdateDiskCounters( PsGetThreadProcess( OriginatingThread ),
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0,
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0,
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0,
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0,
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1 );
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}
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#endif
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//
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// Case on the type of open that we are trying to flush
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//
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switch (TypeOfOpen) {
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case VirtualVolumeFile:
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case EaFile:
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case DirectoryFile:
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DebugTrace(0, Dbg, "Flush that does nothing\n", 0);
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break;
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case UserFileOpen:
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DebugTrace(0, Dbg, "Flush User File Open\n", 0);
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(VOID)FatAcquireExclusiveFcb( IrpContext, Fcb );
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FcbAcquired = TRUE;
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FatVerifyFcb( IrpContext, Fcb );
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//
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// If the file is cached then flush its cache
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//
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Status = FatFlushFile( IrpContext, Fcb, Flush );
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//
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// Also flush the file's dirent in the parent directory if the file
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// flush worked.
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//
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if (NT_SUCCESS( Status )) {
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//
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// Insure that we get the filesize to disk correctly. This is
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// benign if it was already good.
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//
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SetFlag(FileObject->Flags, FO_FILE_SIZE_CHANGED);
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FatUpdateDirentFromFcb( IrpContext, FileObject, Fcb, Ccb );
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if (FlagOn(Fcb->FcbState, FCB_STATE_FLUSH_FAT)) {
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FatFlushRequired = TRUE;
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}
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//
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// Flush the parent Dcb's to get any dirent updates to disk.
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//
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NextFcb = Fcb->ParentDcb;
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while (NextFcb != NULL) {
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//
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// Make sure the Fcb is OK.
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//
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_SEH2_TRY {
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FatVerifyFcb( IrpContext, NextFcb );
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} _SEH2_EXCEPT( FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
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EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
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FatResetExceptionState( IrpContext );
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} _SEH2_END;
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if (NextFcb->FcbCondition == FcbGood) {
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NTSTATUS LocalStatus;
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LocalStatus = FatFlushFile( IrpContext, NextFcb, Flush );
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if (!NT_SUCCESS(LocalStatus)) {
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Status = LocalStatus;
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}
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if (FlagOn(NextFcb->FcbState, FCB_STATE_FLUSH_FAT)) {
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FatFlushRequired = TRUE;
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}
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}
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NextFcb = NextFcb->ParentDcb;
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}
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//
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// Flush the volume file to get any allocation information
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// updates to disk.
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//
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if (FatFlushRequired) {
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Status = FatFlushFat( IrpContext, Vcb );
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ClearFlag(Fcb->FcbState, FCB_STATE_FLUSH_FAT);
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}
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//
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// Set the write through bit so that these modifications
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// will be completed with the request.
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//
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SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH);
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}
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break;
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case UserDirectoryOpen:
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//
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// If the user had opened the root directory then we'll
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// oblige by flushing the volume.
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//
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if (NodeType(Fcb) != FAT_NTC_ROOT_DCB) {
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DebugTrace(0, Dbg, "Flush a directory does nothing\n", 0);
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break;
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}
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case UserVolumeOpen:
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DebugTrace(0, Dbg, "Flush User Volume Open, or root dcb\n", 0);
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//
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// Acquire exclusive access to the Vcb.
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//
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{
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BOOLEAN Finished;
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#ifdef _MSC_VER
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#pragma prefast( suppress:28931, "needed for debug build" )
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#endif
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Finished = FatAcquireExclusiveVcb( IrpContext, Vcb );
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NT_ASSERT( Finished );
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}
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VcbAcquired = TRUE;
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//
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// Mark the volume clean and then flush the volume file,
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// and then all directories
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//
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Status = FatFlushVolume( IrpContext, Vcb, Flush );
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//
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// If the volume was dirty, do the processing that the delayed
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// callback would have done.
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//
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if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_VOLUME_DIRTY)) {
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//
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// Cancel any pending clean volumes.
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//
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(VOID)KeCancelTimer( &Vcb->CleanVolumeTimer );
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(VOID)KeRemoveQueueDpc( &Vcb->CleanVolumeDpc );
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//
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// The volume is now clean, note it.
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//
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if (!FlagOn(Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY)) {
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FatMarkVolume( IrpContext, Vcb, VolumeClean );
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ClearFlag( Vcb->VcbState, VCB_STATE_FLAG_VOLUME_DIRTY );
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}
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//
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// Unlock the volume if it is removable.
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//
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if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_REMOVABLE_MEDIA) &&
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!FlagOn(Vcb->VcbState, VCB_STATE_FLAG_BOOT_OR_PAGING_FILE)) {
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FatToggleMediaEjectDisable( IrpContext, Vcb, FALSE );
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}
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}
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break;
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default:
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#ifdef _MSC_VER
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#pragma prefast( suppress:28159, "things are seriously wrong if we get here" )
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#endif
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FatBugCheck( TypeOfOpen, 0, 0 );
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}
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FatUnpinRepinnedBcbs( IrpContext );
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} _SEH2_FINALLY {
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DebugUnwind( FatCommonFlushBuffers );
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if (VcbAcquired) { FatReleaseVcb( IrpContext, Vcb ); }
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if (FcbAcquired) { FatReleaseFcb( IrpContext, Fcb ); }
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//
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// If this is a normal termination then pass the request on
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// to the target device object.
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//
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if (!_SEH2_AbnormalTermination()) {
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#if (NTDDI_VERSION >= NTDDI_WIN8)
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if ((IrpSp->MinorFunction != IRP_MN_FLUSH_DATA_ONLY) &&
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(IrpSp->MinorFunction != IRP_MN_FLUSH_NO_SYNC)) {
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#endif
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NTSTATUS DriverStatus;
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//
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// Get the next stack location, and copy over the stack location
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//
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IoCopyCurrentIrpStackLocationToNext(Irp);
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//
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// Set up the completion routine
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//
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IoSetCompletionRoutine( Irp,
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FatFlushCompletionRoutine,
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ULongToPtr( Status ),
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TRUE,
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TRUE,
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TRUE );
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//
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// Send the request.
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//
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DriverStatus = IoCallDriver(Vcb->TargetDeviceObject, Irp);
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if ((DriverStatus == STATUS_PENDING) ||
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(!NT_SUCCESS(DriverStatus) &&
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(DriverStatus != STATUS_INVALID_DEVICE_REQUEST))) {
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Status = DriverStatus;
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}
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Irp = NULL;
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#if (NTDDI_VERSION >= NTDDI_WIN8)
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}
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#endif
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|
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//
|
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// Complete the Irp if necessary and return to the caller.
|
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//
|
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FatCompleteRequest( IrpContext, Irp, Status );
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|
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}
|
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DebugTrace(-1, Dbg, "FatCommonFlushBuffers -> %08lx\n", Status);
|
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} _SEH2_END;
|
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|
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return Status;
|
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}
|
||
|
||
|
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_Requires_lock_held_(_Global_critical_region_)
|
||
NTSTATUS
|
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FatFlushDirectory (
|
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IN PIRP_CONTEXT IrpContext,
|
||
IN PDCB Dcb,
|
||
IN FAT_FLUSH_TYPE FlushType
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine non-recursively flushes a dcb tree.
|
||
|
||
Arguments:
|
||
|
||
Dcb - Supplies the Dcb being flushed
|
||
|
||
FlushType - Specifies the kind of flushing to perform
|
||
|
||
Return Value:
|
||
|
||
VOID
|
||
|
||
--*/
|
||
|
||
{
|
||
PFCB Fcb;
|
||
PVCB Vcb;
|
||
PFCB NextFcb;
|
||
|
||
PDIRENT Dirent;
|
||
PBCB DirentBcb = NULL;
|
||
|
||
NTSTATUS Status;
|
||
NTSTATUS ReturnStatus = STATUS_SUCCESS;
|
||
|
||
BOOLEAN ClearWriteThroughOnExit = FALSE;
|
||
BOOLEAN ClearWaitOnExit = FALSE;
|
||
|
||
ULONG CorrectedFileSize = 0;
|
||
|
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PAGED_CODE();
|
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|
||
NT_ASSERT( FatVcbAcquiredExclusive(IrpContext, Dcb->Vcb) );
|
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|
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DebugTrace(+1, Dbg, "FatFlushDirectory, Dcb = %p\n", Dcb);
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|
||
//
|
||
// First flush all the files, then the directories, to make sure all the
|
||
// file sizes and times get sets correctly on disk.
|
||
//
|
||
// We also have to check here if the "Ea Data. Sf" fcb really
|
||
// corressponds to an existing file.
|
||
//
|
||
|
||
if (!FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH)) {
|
||
|
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ClearWriteThroughOnExit = TRUE;
|
||
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH);
|
||
}
|
||
|
||
if (!FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT)) {
|
||
|
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ClearWaitOnExit = TRUE;
|
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SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
|
||
}
|
||
|
||
Vcb = Dcb->Vcb;
|
||
Fcb = Dcb;
|
||
|
||
while (Fcb != NULL) {
|
||
|
||
NextFcb = FatGetNextFcbTopDown(IrpContext, Fcb, Dcb);
|
||
|
||
if ( (NodeType( Fcb ) == FAT_NTC_FCB) &&
|
||
(Vcb->EaFcb != Fcb) &&
|
||
!IsFileDeleted(IrpContext, Fcb)) {
|
||
|
||
(VOID)FatAcquireExclusiveFcb( IrpContext, Fcb );
|
||
|
||
ClearFlag( Vcb->VcbState, VCB_STATE_FLAG_DELETED_FCB );
|
||
|
||
//
|
||
// Exception handler to catch and commute errors encountered
|
||
// doing the flush dance. We may encounter corruption, and
|
||
// should continue flushing the volume as much as possible.
|
||
//
|
||
|
||
_SEH2_TRY {
|
||
|
||
//
|
||
// Standard handler to release resources, etc.
|
||
//
|
||
|
||
_SEH2_TRY {
|
||
|
||
//
|
||
// Make sure the Fcb is OK.
|
||
//
|
||
|
||
_SEH2_TRY {
|
||
|
||
FatVerifyFcb( IrpContext, Fcb );
|
||
|
||
} _SEH2_EXCEPT( FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
|
||
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
|
||
|
||
FatResetExceptionState( IrpContext );
|
||
} _SEH2_END;
|
||
|
||
//
|
||
// If this Fcb is not good skip it. Note that a 'continue'
|
||
// here would be very expensive as we inside a try{} body.
|
||
//
|
||
|
||
if (Fcb->FcbCondition != FcbGood) {
|
||
|
||
try_leave( NOTHING);
|
||
}
|
||
|
||
//
|
||
// In case a handle was never closed and the FS and AS are more
|
||
// than a cluster different, do this truncate.
|
||
//
|
||
|
||
if ( FlagOn(Fcb->FcbState, FCB_STATE_TRUNCATE_ON_CLOSE) ) {
|
||
|
||
|
||
FatTruncateFileAllocation( IrpContext,
|
||
Fcb,
|
||
Fcb->Header.FileSize.LowPart );
|
||
|
||
|
||
}
|
||
|
||
//
|
||
// Also compare the file's dirent in the parent directory
|
||
// with the size information in the Fcb and update
|
||
// it if neccessary. Note that we don't mark the Bcb dirty
|
||
// because we will be flushing the file object presently, and
|
||
// Mm knows what's really dirty.
|
||
//
|
||
|
||
FatGetDirentFromFcbOrDcb( IrpContext,
|
||
Fcb,
|
||
FALSE,
|
||
&Dirent,
|
||
&DirentBcb );
|
||
|
||
|
||
CorrectedFileSize = Fcb->Header.FileSize.LowPart;
|
||
|
||
|
||
if (Dirent->FileSize != CorrectedFileSize) {
|
||
|
||
Dirent->FileSize = CorrectedFileSize;
|
||
|
||
|
||
}
|
||
|
||
//
|
||
// We must unpin the Bcb before the flush since we recursively tear up
|
||
// the tree if Mm decides that the data section is no longer referenced
|
||
// and the final close comes in for this file. If this parent has no
|
||
// more children as a result, we will try to initiate teardown on it
|
||
// and Cc will deadlock against the active count of this Bcb.
|
||
//
|
||
|
||
FatUnpinBcb( IrpContext, DirentBcb );
|
||
|
||
//
|
||
// Now flush the file. Note that this may make the Fcb
|
||
// go away if Mm dereferences its file object.
|
||
//
|
||
|
||
Status = FatFlushFile( IrpContext, Fcb, FlushType );
|
||
|
||
if (!NT_SUCCESS(Status)) {
|
||
|
||
ReturnStatus = Status;
|
||
}
|
||
|
||
} _SEH2_FINALLY {
|
||
|
||
FatUnpinBcb( IrpContext, DirentBcb );
|
||
|
||
//
|
||
// Since we have the Vcb exclusive we know that if any closes
|
||
// come in it is because the CcPurgeCacheSection caused the
|
||
// Fcb to go away.
|
||
//
|
||
|
||
if ( !FlagOn(Vcb->VcbState, VCB_STATE_FLAG_DELETED_FCB) ) {
|
||
|
||
FatReleaseFcb( (IRPCONTEXT), Fcb );
|
||
}
|
||
} _SEH2_END;
|
||
} _SEH2_EXCEPT( (FsRtlIsNtstatusExpected( ReturnStatus = _SEH2_GetExceptionCode() ) != 0 ) ?
|
||
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
|
||
FatResetExceptionState( IrpContext );
|
||
} _SEH2_END;
|
||
|
||
}
|
||
|
||
Fcb = NextFcb;
|
||
}
|
||
|
||
//
|
||
// OK, now flush the directories.
|
||
//
|
||
|
||
Fcb = Dcb;
|
||
|
||
while (Fcb != NULL) {
|
||
|
||
NextFcb = FatGetNextFcbTopDown(IrpContext, Fcb, Dcb);
|
||
|
||
if ( (NodeType( Fcb ) != FAT_NTC_FCB) &&
|
||
!IsFileDeleted(IrpContext, Fcb) ) {
|
||
|
||
//
|
||
// Make sure the Fcb is OK.
|
||
//
|
||
|
||
_SEH2_TRY {
|
||
|
||
FatVerifyFcb( IrpContext, Fcb );
|
||
|
||
} _SEH2_EXCEPT( FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
|
||
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
|
||
|
||
FatResetExceptionState( IrpContext );
|
||
} _SEH2_END;
|
||
|
||
if (Fcb->FcbCondition == FcbGood) {
|
||
|
||
Status = FatFlushFile( IrpContext, Fcb, FlushType );
|
||
|
||
if (!NT_SUCCESS(Status)) {
|
||
|
||
ReturnStatus = Status;
|
||
}
|
||
}
|
||
}
|
||
|
||
Fcb = NextFcb;
|
||
}
|
||
|
||
_SEH2_TRY {
|
||
|
||
FatUnpinRepinnedBcbs( IrpContext );
|
||
|
||
} _SEH2_EXCEPT(FatExceptionFilter( IrpContext, _SEH2_GetExceptionInformation() )) {
|
||
|
||
ReturnStatus = IrpContext->ExceptionStatus;
|
||
} _SEH2_END;
|
||
|
||
if (ClearWriteThroughOnExit) {
|
||
|
||
ClearFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH);
|
||
}
|
||
if (ClearWaitOnExit) {
|
||
|
||
ClearFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
|
||
}
|
||
|
||
DebugTrace(-1, Dbg, "FatFlushDirectory -> 0x%08lx\n", ReturnStatus);
|
||
|
||
return ReturnStatus;
|
||
}
|
||
|
||
|
||
NTSTATUS
|
||
FatFlushFat (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PVCB Vcb
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
The function carefully flushes the entire FAT for a volume. It is
|
||
nessecary to dance around a bit because of complicated synchronization
|
||
reasons.
|
||
|
||
Arguments:
|
||
|
||
Vcb - Supplies the Vcb whose FAT is being flushed
|
||
|
||
Return Value:
|
||
|
||
VOID
|
||
|
||
--*/
|
||
|
||
{
|
||
PBCB Bcb;
|
||
PVOID DontCare;
|
||
IO_STATUS_BLOCK Iosb;
|
||
LARGE_INTEGER Offset;
|
||
|
||
NTSTATUS ReturnStatus = STATUS_SUCCESS;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// If this volume is write protected, no need to flush.
|
||
//
|
||
|
||
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
|
||
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
//
|
||
// Make sure the Vcb is OK.
|
||
//
|
||
|
||
_SEH2_TRY {
|
||
|
||
FatVerifyVcb( IrpContext, Vcb );
|
||
|
||
} _SEH2_EXCEPT( FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
|
||
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
|
||
|
||
FatResetExceptionState( IrpContext );
|
||
} _SEH2_END;
|
||
|
||
if (Vcb->VcbCondition != VcbGood) {
|
||
|
||
return STATUS_FILE_INVALID;
|
||
}
|
||
|
||
//
|
||
// The only way we have to correctly synchronize things is to
|
||
// repin stuff, and then unpin repin it.
|
||
//
|
||
// With NT 5.0, we can use some new cache manager support to make
|
||
// this a lot more efficient (important for FAT32). Since we're
|
||
// only worried about ranges that are dirty - and since we're a
|
||
// modified-no-write stream - we can assume that if there is no
|
||
// BCB, there is no work to do in the range. I.e., the lazy writer
|
||
// beat us to it.
|
||
//
|
||
// This is much better than reading the entire FAT in and trying
|
||
// to punch it out (see the test in the write path to blow
|
||
// off writes that don't correspond to dirty ranges of the FAT).
|
||
// For FAT32, this would be a *lot* of reading.
|
||
//
|
||
|
||
if (Vcb->AllocationSupport.FatIndexBitSize != 12) {
|
||
|
||
//
|
||
// Walk through the Fat, one page at a time.
|
||
//
|
||
|
||
ULONG NumberOfPages;
|
||
ULONG Page;
|
||
|
||
NumberOfPages = ( FatReservedBytes(&Vcb->Bpb) +
|
||
FatBytesPerFat(&Vcb->Bpb) +
|
||
(PAGE_SIZE - 1) ) / PAGE_SIZE;
|
||
|
||
|
||
for ( Page = 0, Offset.QuadPart = 0;
|
||
Page < NumberOfPages;
|
||
Page++, Offset.LowPart += PAGE_SIZE ) {
|
||
|
||
_SEH2_TRY {
|
||
|
||
if (CcPinRead( Vcb->VirtualVolumeFile,
|
||
&Offset,
|
||
PAGE_SIZE,
|
||
PIN_WAIT | PIN_IF_BCB,
|
||
&Bcb,
|
||
&DontCare )) {
|
||
|
||
CcSetDirtyPinnedData( Bcb, NULL );
|
||
CcRepinBcb( Bcb );
|
||
CcUnpinData( Bcb );
|
||
CcUnpinRepinnedBcb( Bcb, TRUE, &Iosb );
|
||
|
||
if (!NT_SUCCESS(Iosb.Status)) {
|
||
|
||
ReturnStatus = Iosb.Status;
|
||
}
|
||
}
|
||
|
||
} _SEH2_EXCEPT(FatExceptionFilter(IrpContext, _SEH2_GetExceptionInformation())) {
|
||
|
||
ReturnStatus = IrpContext->ExceptionStatus;
|
||
continue;
|
||
} _SEH2_END;
|
||
}
|
||
|
||
} else {
|
||
|
||
//
|
||
// We read in the entire fat in the 12 bit case.
|
||
//
|
||
|
||
Offset.QuadPart = FatReservedBytes( &Vcb->Bpb );
|
||
|
||
_SEH2_TRY {
|
||
|
||
if (CcPinRead( Vcb->VirtualVolumeFile,
|
||
&Offset,
|
||
FatBytesPerFat( &Vcb->Bpb ),
|
||
PIN_WAIT | PIN_IF_BCB,
|
||
&Bcb,
|
||
&DontCare )) {
|
||
|
||
CcSetDirtyPinnedData( Bcb, NULL );
|
||
CcRepinBcb( Bcb );
|
||
CcUnpinData( Bcb );
|
||
CcUnpinRepinnedBcb( Bcb, TRUE, &Iosb );
|
||
|
||
if (!NT_SUCCESS(Iosb.Status)) {
|
||
|
||
ReturnStatus = Iosb.Status;
|
||
}
|
||
}
|
||
|
||
} _SEH2_EXCEPT(FatExceptionFilter(IrpContext, _SEH2_GetExceptionInformation())) {
|
||
|
||
ReturnStatus = IrpContext->ExceptionStatus;
|
||
} _SEH2_END;
|
||
}
|
||
|
||
return ReturnStatus;
|
||
}
|
||
|
||
|
||
_Requires_lock_held_(_Global_critical_region_)
|
||
NTSTATUS
|
||
FatFlushVolume (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PVCB Vcb,
|
||
IN FAT_FLUSH_TYPE FlushType
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
The following routine is used to flush a volume to disk, including the
|
||
volume file, and ea file.
|
||
|
||
Arguments:
|
||
|
||
Vcb - Supplies the volume being flushed
|
||
|
||
FlushType - Specifies the kind of flushing to perform
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS - The Status from the flush.
|
||
|
||
--*/
|
||
|
||
{
|
||
NTSTATUS Status;
|
||
NTSTATUS ReturnStatus = STATUS_SUCCESS;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// If this volume is write protected, no need to flush.
|
||
//
|
||
|
||
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
|
||
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
//
|
||
// Flush all the files and directories.
|
||
//
|
||
|
||
Status = FatFlushDirectory( IrpContext, Vcb->RootDcb, FlushType );
|
||
|
||
if (!NT_SUCCESS(Status)) {
|
||
|
||
ReturnStatus = Status;
|
||
}
|
||
|
||
//
|
||
// Now Flush the FAT
|
||
//
|
||
|
||
Status = FatFlushFat( IrpContext, Vcb );
|
||
|
||
if (!NT_SUCCESS(Status)) {
|
||
|
||
ReturnStatus = Status;
|
||
}
|
||
|
||
//
|
||
// Unlock the volume if it is removable.
|
||
//
|
||
|
||
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_REMOVABLE_MEDIA) &&
|
||
!FlagOn(Vcb->VcbState, VCB_STATE_FLAG_BOOT_OR_PAGING_FILE)) {
|
||
|
||
FatToggleMediaEjectDisable( IrpContext, Vcb, FALSE );
|
||
}
|
||
|
||
return ReturnStatus;
|
||
}
|
||
|
||
|
||
_Requires_lock_held_(_Global_critical_region_)
|
||
NTSTATUS
|
||
FatFlushFile (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PFCB Fcb,
|
||
IN FAT_FLUSH_TYPE FlushType
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine simply flushes the data section on a file.
|
||
|
||
Arguments:
|
||
|
||
Fcb - Supplies the file being flushed
|
||
|
||
FlushType - Specifies the kind of flushing to perform
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS - The Status from the flush.
|
||
|
||
--*/
|
||
|
||
{
|
||
IO_STATUS_BLOCK Iosb;
|
||
PVCB Vcb = Fcb->Vcb;
|
||
|
||
PAGED_CODE();
|
||
|
||
CcFlushCache( &Fcb->NonPaged->SectionObjectPointers, NULL, 0, &Iosb );
|
||
|
||
|
||
if ( !FlagOn( Vcb->VcbState, VCB_STATE_FLAG_DELETED_FCB )) {
|
||
|
||
//
|
||
// Grab and release PagingIo to serialize ourselves with the lazy writer.
|
||
// This will work to ensure that all IO has completed on the cached
|
||
// data.
|
||
//
|
||
// If we are to invalidate the file, now is the right time to do it. Do
|
||
// it non-recursively so we don't thump children before their time.
|
||
//
|
||
|
||
ExAcquireResourceExclusiveLite( Fcb->Header.PagingIoResource, TRUE);
|
||
|
||
if (FlushType == FlushAndInvalidate) {
|
||
|
||
FatMarkFcbCondition( IrpContext, Fcb, FcbBad, FALSE );
|
||
}
|
||
|
||
ExReleaseResourceLite( Fcb->Header.PagingIoResource );
|
||
}
|
||
|
||
return Iosb.Status;
|
||
}
|
||
|
||
|
||
NTSTATUS
|
||
FatHijackIrpAndFlushDevice (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PIRP Irp,
|
||
IN PDEVICE_OBJECT TargetDeviceObject
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine is called when we need to send a flush to a device but
|
||
we don't have a flush Irp. What this routine does is make a copy
|
||
of its current Irp stack location, but changes the Irp Major code
|
||
to a IRP_MJ_FLUSH_BUFFERS amd then send it down, but cut it off at
|
||
the knees in the completion routine, fix it up and return to the
|
||
user as if nothing had happened.
|
||
|
||
Arguments:
|
||
|
||
Irp - The Irp to hijack
|
||
|
||
TargetDeviceObject - The device to send the request to.
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS - The Status from the flush in case anybody cares.
|
||
|
||
--*/
|
||
|
||
{
|
||
KEVENT Event;
|
||
NTSTATUS Status;
|
||
PIO_STACK_LOCATION NextIrpSp;
|
||
|
||
PAGED_CODE();
|
||
|
||
UNREFERENCED_PARAMETER( IrpContext );
|
||
|
||
//
|
||
// Get the next stack location, and copy over the stack location
|
||
//
|
||
|
||
IoCopyCurrentIrpStackLocationToNext(Irp);
|
||
|
||
NextIrpSp = IoGetNextIrpStackLocation( Irp );
|
||
NextIrpSp->MajorFunction = IRP_MJ_FLUSH_BUFFERS;
|
||
NextIrpSp->MinorFunction = 0;
|
||
|
||
//
|
||
// Set up the completion routine
|
||
//
|
||
|
||
KeInitializeEvent( &Event, NotificationEvent, FALSE );
|
||
|
||
IoSetCompletionRoutine( Irp,
|
||
FatHijackCompletionRoutine,
|
||
&Event,
|
||
TRUE,
|
||
TRUE,
|
||
TRUE );
|
||
|
||
//
|
||
// Send the request.
|
||
//
|
||
|
||
Status = IoCallDriver( TargetDeviceObject, Irp );
|
||
|
||
if (Status == STATUS_PENDING) {
|
||
|
||
KeWaitForSingleObject( &Event, Executive, KernelMode, FALSE, NULL );
|
||
|
||
Status = Irp->IoStatus.Status;
|
||
}
|
||
|
||
//
|
||
// If the driver doesn't support flushes, return SUCCESS.
|
||
//
|
||
|
||
if (Status == STATUS_INVALID_DEVICE_REQUEST) {
|
||
Status = STATUS_SUCCESS;
|
||
}
|
||
|
||
Irp->IoStatus.Status = 0;
|
||
Irp->IoStatus.Information = 0;
|
||
|
||
return Status;
|
||
}
|
||
|
||
|
||
VOID
|
||
FatFlushFatEntries (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PVCB Vcb,
|
||
IN ULONG Cluster,
|
||
IN ULONG Count
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This macro flushes the FAT page(s) containing the passed in run.
|
||
|
||
Arguments:
|
||
|
||
Vcb - Supplies the volume being flushed
|
||
|
||
Cluster - The starting cluster
|
||
|
||
Count - The number of FAT entries in the run
|
||
|
||
Return Value:
|
||
|
||
VOID
|
||
|
||
--*/
|
||
|
||
{
|
||
ULONG ByteCount;
|
||
LARGE_INTEGER FileOffset;
|
||
|
||
IO_STATUS_BLOCK Iosb;
|
||
|
||
PAGED_CODE();
|
||
|
||
FileOffset.HighPart = 0;
|
||
FileOffset.LowPart = FatReservedBytes( &Vcb->Bpb );
|
||
|
||
if (Vcb->AllocationSupport.FatIndexBitSize == 12) {
|
||
|
||
FileOffset.LowPart += Cluster * 3 / 2;
|
||
ByteCount = (Count * 3 / 2) + 1;
|
||
|
||
} else if (Vcb->AllocationSupport.FatIndexBitSize == 32) {
|
||
|
||
FileOffset.LowPart += Cluster * sizeof(ULONG);
|
||
ByteCount = Count * sizeof(ULONG);
|
||
|
||
} else {
|
||
|
||
FileOffset.LowPart += Cluster * sizeof( USHORT );
|
||
ByteCount = Count * sizeof( USHORT );
|
||
|
||
}
|
||
|
||
CcFlushCache( &Vcb->SectionObjectPointers,
|
||
&FileOffset,
|
||
ByteCount,
|
||
&Iosb );
|
||
|
||
if (NT_SUCCESS(Iosb.Status)) {
|
||
Iosb.Status = FatHijackIrpAndFlushDevice( IrpContext,
|
||
IrpContext->OriginatingIrp,
|
||
Vcb->TargetDeviceObject );
|
||
}
|
||
|
||
if (!NT_SUCCESS(Iosb.Status)) {
|
||
FatNormalizeAndRaiseStatus(IrpContext, Iosb.Status);
|
||
}
|
||
}
|
||
|
||
|
||
VOID
|
||
FatFlushDirentForFile (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PFCB Fcb
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This macro flushes the page containing a file's DIRENT in its parent.
|
||
|
||
Arguments:
|
||
|
||
Fcb - Supplies the file whose DIRENT is being flushed
|
||
|
||
Return Value:
|
||
|
||
VOID
|
||
|
||
--*/
|
||
|
||
{
|
||
LARGE_INTEGER FileOffset;
|
||
IO_STATUS_BLOCK Iosb;
|
||
|
||
PAGED_CODE();
|
||
|
||
FileOffset.QuadPart = Fcb->DirentOffsetWithinDirectory;
|
||
|
||
CcFlushCache( &Fcb->ParentDcb->NonPaged->SectionObjectPointers,
|
||
&FileOffset,
|
||
sizeof( DIRENT ),
|
||
&Iosb );
|
||
|
||
if (NT_SUCCESS(Iosb.Status)) {
|
||
Iosb.Status = FatHijackIrpAndFlushDevice( IrpContext,
|
||
IrpContext->OriginatingIrp,
|
||
Fcb->Vcb->TargetDeviceObject );
|
||
}
|
||
|
||
if (!NT_SUCCESS(Iosb.Status)) {
|
||
FatNormalizeAndRaiseStatus(IrpContext, Iosb.Status);
|
||
}
|
||
}
|
||
|
||
|
||
//
|
||
// Local support routine
|
||
//
|
||
|
||
NTSTATUS
|
||
NTAPI
|
||
FatFlushCompletionRoutine (
|
||
IN PDEVICE_OBJECT DeviceObject,
|
||
IN PIRP Irp,
|
||
IN PVOID Contxt
|
||
)
|
||
|
||
{
|
||
NTSTATUS Status = (NTSTATUS) (ULONG_PTR) Contxt;
|
||
|
||
if ( Irp->PendingReturned ) {
|
||
|
||
IoMarkIrpPending( Irp );
|
||
}
|
||
|
||
//
|
||
// If the Irp got STATUS_INVALID_DEVICE_REQUEST, normalize it
|
||
// to STATUS_SUCCESS.
|
||
//
|
||
|
||
if (NT_SUCCESS(Irp->IoStatus.Status) ||
|
||
(Irp->IoStatus.Status == STATUS_INVALID_DEVICE_REQUEST)) {
|
||
|
||
Irp->IoStatus.Status = Status;
|
||
}
|
||
|
||
UNREFERENCED_PARAMETER( DeviceObject );
|
||
UNREFERENCED_PARAMETER( Contxt );
|
||
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
//
|
||
// Local support routine
|
||
//
|
||
|
||
NTSTATUS
|
||
NTAPI
|
||
FatHijackCompletionRoutine (
|
||
_In_ PDEVICE_OBJECT DeviceObject,
|
||
_In_ PIRP Irp,
|
||
_In_reads_opt_(_Inexpressible_("varies")) PVOID Contxt
|
||
)
|
||
|
||
{
|
||
//
|
||
// Set the event so that our call will wake up.
|
||
//
|
||
|
||
KeSetEvent( (PKEVENT)Contxt, 0, FALSE );
|
||
|
||
UNREFERENCED_PARAMETER( DeviceObject );
|
||
UNREFERENCED_PARAMETER( Irp );
|
||
|
||
return STATUS_MORE_PROCESSING_REQUIRED;
|
||
}
|
||
|