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C++ IsFlagOn函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中IsFlagOn函数的典型用法代码示例。如果您正苦于以下问题：C++ IsFlagOn函数的具体用法？C++ IsFlagOn怎么用？C++ IsFlagOn使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了IsFlagOn函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: Ext2FlushFiles

NTSTATUS
Ext2FlushFiles(
    IN PEXT2_IRP_CONTEXT    IrpContext,
    IN PEXT2_VCB            Vcb,
    IN BOOLEAN              bShutDown
)
{
    IO_STATUS_BLOCK    IoStatus;

    PEXT2_FCB       Fcb;
    PLIST_ENTRY     ListEntry;

    if (IsFlagOn(Vcb->Flags, VCB_READ_ONLY) ||
            IsFlagOn(Vcb->Flags, VCB_WRITE_PROTECTED)) {
        return STATUS_SUCCESS;
    }

    IoStatus.Status = STATUS_SUCCESS;

    DEBUG(DL_INF, ( "Flushing Files ...\n"));

    // Flush all Fcbs in Vcb list queue.
    for (ListEntry = Vcb->FcbList.Flink;
            ListEntry != &Vcb->FcbList;
            ListEntry = ListEntry->Flink ) {

        Fcb = CONTAINING_RECORD(ListEntry, EXT2_FCB, Next);
        ExAcquireResourceExclusiveLite(
            &Fcb->MainResource, TRUE);
        IoStatus.Status = Ext2FlushFile(IrpContext, Fcb, NULL);
        ExReleaseResourceLite(&Fcb->MainResource);
    }

    return IoStatus.Status;
}
开发者ID:Uroc327，项目名称:ext2fsd，代码行数:35，代码来源:flush.c


示例2: Ext2QueueCloseRequest

VOID
Ext2QueueCloseRequest (IN PEXT2_IRP_CONTEXT IrpContext)
{
    ASSERT(IrpContext);
    ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
           (IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));

    if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_DELAY_CLOSE)) {

        if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_FILE_BUSY)) {
            Ext2Sleep(500); /* 0.5 sec*/
        } else {
            Ext2Sleep(50);  /* 0.05 sec*/
        }

    } else {

        SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
        SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_DELAY_CLOSE);

        IrpContext->Fcb = (PEXT2_FCB) IrpContext->FileObject->FsContext;
        IrpContext->Ccb = (PEXT2_CCB) IrpContext->FileObject->FsContext2;
    }

    ExInitializeWorkItem(
        &IrpContext->WorkQueueItem,
        Ext2DeQueueCloseRequest,
        IrpContext);

    ExQueueWorkItem(&IrpContext->WorkQueueItem, DelayedWorkQueue);
}
开发者ID:herocodemaster，项目名称:ext2fsd，代码行数:31，代码来源:close.c


示例3: Ext2ReadWriteBlockAsyncCompletionRoutine

NTSTATUS
Ext2ReadWriteBlockAsyncCompletionRoutine (
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp,
    IN PVOID Context
)
{
    PEXT2_RW_CONTEXT pContext = (PEXT2_RW_CONTEXT)Context;
    PIO_STACK_LOCATION iosp;

    ASSERT(FALSE == pContext->Wait);

    if (Irp != pContext->MasterIrp && !NT_SUCCESS(Irp->IoStatus.Status)) {
        pContext->MasterIrp->IoStatus = Irp->IoStatus;
    }

    if (InterlockedDecrement(&pContext->Blocks) == 0) {

        if (NT_SUCCESS(pContext->MasterIrp->IoStatus.Status)) {

            /* set written bytes to status information */
            pContext->MasterIrp->IoStatus.Information = pContext->Length;

            if (pContext->FileObject != NULL && !IsFlagOn(pContext->MasterIrp->Flags, IRP_PAGING_IO)) {

                /* modify FileObject flags, skip this for volume direct access */
                SetFlag( pContext->FileObject->Flags,
                         IsFlagOn(pContext->Flags, EXT2_RW_CONTEXT_WRITE) ?
                         FO_FILE_MODIFIED : FO_FILE_FAST_IO_READ);

                /* update Current Byteoffset */
                if (IsFlagOn(pContext->FileObject->Flags, FO_SYNCHRONOUS_IO)) {
                    iosp = IoGetCurrentIrpStackLocation(pContext->MasterIrp);
                    pContext->FileObject->CurrentByteOffset.QuadPart =
                        iosp->Parameters.Read.ByteOffset.QuadPart +  pContext->Length;
                }
            }

        } else {

            pContext->MasterIrp->IoStatus.Information = 0;
        }

        /* release the locked resource acquired by the caller */
        if (pContext->Resource) {
            ExReleaseResourceForThread(pContext->Resource, pContext->ThreadId);
        }

        Ext2FreePool(pContext, EXT2_RWC_MAGIC);
        DEC_MEM_COUNT(PS_RW_CONTEXT, pContext, sizeof(EXT2_RW_CONTEXT));
    }

    return STATUS_SUCCESS;
}
开发者ID:dond2008，项目名称:ext2fsd，代码行数:54，代码来源:block.c


示例4: FFSPurgeFile

__drv_mustHoldCriticalRegion
NTSTATUS
FFSPurgeFile(
	IN PFFS_FCB Fcb,
	IN BOOLEAN  FlushBeforePurge)
{
	IO_STATUS_BLOCK    IoStatus;

    PAGED_CODE();

	ASSERT(Fcb != NULL);

	ASSERT((Fcb->Identifier.Type == FFSFCB) &&
			(Fcb->Identifier.Size == sizeof(FFS_FCB)));


	if(!IsFlagOn(Fcb->Vcb->Flags, VCB_READ_ONLY) && FlushBeforePurge &&
			!IsFlagOn(Fcb->Vcb->Flags, VCB_WRITE_PROTECTED))
	{

		FFSPrint((DBG_INFO, "FFSPurgeFile: CcFlushCache on %s.\n", 
					Fcb->AnsiFileName.Buffer));

		ExAcquireSharedStarveExclusive(&Fcb->PagingIoResource, TRUE);
		ExReleaseResourceLite(&Fcb->PagingIoResource);

		CcFlushCache(&Fcb->SectionObject, NULL, 0, &IoStatus);

		ClearFlag(Fcb->Flags, FCB_FILE_MODIFIED);
	}

	if (Fcb->SectionObject.ImageSectionObject)
	{

		FFSPrint((DBG_INFO, "FFSPurgeFile: MmFlushImageSection on %s.\n", 
					Fcb->AnsiFileName.Buffer));

		MmFlushImageSection(&Fcb->SectionObject, MmFlushForWrite);
	}

	if (Fcb->SectionObject.DataSectionObject)
	{

		FFSPrint((DBG_INFO, "FFSPurgeFile: CcPurgeCacheSection on %s.\n",
					Fcb->AnsiFileName.Buffer));

		CcPurgeCacheSection(&Fcb->SectionObject, NULL, 0, FALSE);
	}

	return STATUS_SUCCESS;
}
开发者ID:GYGit，项目名称:reactos，代码行数:51，代码来源:fsctl.c


示例5: FFSZeroHoles

BOOLEAN
FFSZeroHoles(
	IN PFFS_IRP_CONTEXT IrpContext,
	IN PFFS_VCB         Vcb,
	IN PFILE_OBJECT     FileObject,
	IN LONGLONG         Offset,
	IN LONGLONG         Count)
{
	LARGE_INTEGER StartAddr = {0, 0};
	LARGE_INTEGER EndAddr = {0, 0};

	StartAddr.QuadPart = (Offset + (SECTOR_SIZE - 1)) &
		~((LONGLONG)SECTOR_SIZE - 1);

	EndAddr.QuadPart = (Offset + Count + (SECTOR_SIZE - 1)) &
		~((LONGLONG)SECTOR_SIZE - 1);

	if (StartAddr.QuadPart < EndAddr.QuadPart)
	{
		return CcZeroData(FileObject,
				&StartAddr,
				&EndAddr,
				IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT));
	}

	return TRUE;
}
开发者ID:layerfsd，项目名称:ffsfsd，代码行数:27，代码来源:write.c


示例6: FFSQueueCloseRequest

VOID
FFSQueueCloseRequest(
	IN PFFS_IRP_CONTEXT IrpContext)
{
    PAGED_CODE();

	ASSERT(IrpContext);

	ASSERT((IrpContext->Identifier.Type == FFSICX) &&
			(IrpContext->Identifier.Size == sizeof(FFS_IRP_CONTEXT)));

	if (!IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_DELAY_CLOSE))
	{
		SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_DELAY_CLOSE);

		IrpContext->Fcb = (PFFS_FCB)IrpContext->FileObject->FsContext;
		IrpContext->Ccb = (PFFS_CCB)IrpContext->FileObject->FsContext2;

		IrpContext->FileObject = NULL;
	}

	// IsSynchronous means we can block (so we don't requeue it)
	IrpContext->IsSynchronous = TRUE;

	ExInitializeWorkItem(
			&IrpContext->WorkQueueItem,
			FFSDeQueueCloseRequest,
			IrpContext);

	ExQueueWorkItem(&IrpContext->WorkQueueItem, CriticalWorkQueue);
}
开发者ID:GYGit，项目名称:reactos，代码行数:31，代码来源:close.c


示例7: Ext2CompleteIrpContext

NTSTATUS
Ext2CompleteIrpContext (
    IN PEXT2_IRP_CONTEXT IrpContext,
    IN NTSTATUS Status )
{
    PIRP    Irp = NULL;
    BOOLEAN bPrint;

    Irp = IrpContext->Irp;

    if (Irp != NULL) {

        if (NT_ERROR(Status)) {
            Irp->IoStatus.Information = 0;
        }

        Irp->IoStatus.Status = Status;
        bPrint = !IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_REQUEUED);

        Ext2CompleteRequest(
            Irp, bPrint, (CCHAR)(NT_SUCCESS(Status)?
                                 IO_DISK_INCREMENT : IO_NO_INCREMENT) );

        IrpContext->Irp = NULL;
    }

    Ext2FreeIrpContext(IrpContext);

    return Status;
}
开发者ID:jrfl，项目名称:ext2fsd，代码行数:30，代码来源:read.c


示例8: Ext2FastIoWrite

BOOLEAN
Ext2FastIoWrite (
    IN PFILE_OBJECT         FileObject,
    IN PLARGE_INTEGER       FileOffset,
    IN ULONG                Length,
    IN BOOLEAN              Wait,
    IN ULONG                LockKey,
    OUT PVOID               Buffer,
    OUT PIO_STATUS_BLOCK    IoStatus,
    IN PDEVICE_OBJECT       DeviceObject)
{
    PEXT2_FCB   Fcb = NULL;
    BOOLEAN     Status = FALSE;
    BOOLEAN     Locked = FALSE;

    Fcb = (PEXT2_FCB) FileObject->FsContext;
    if (Fcb == NULL)
        return FALSE;

    __try {

        FsRtlEnterFileSystem();

        ASSERT((Fcb->Identifier.Type == EXT2FCB) &&
               (Fcb->Identifier.Size == sizeof(EXT2_FCB)));

        if (IsFlagOn(Fcb->Vcb->Flags, VCB_READ_ONLY)) {
            __leave;
        }

        ExAcquireResourceSharedLite(&Fcb->MainResource, TRUE);
        Locked = TRUE;

        if (IsEndOfFile(*FileOffset) || ((LONGLONG)(Fcb->Inode->i_size) <
                                         (FileOffset->QuadPart + Length)) ) {
        } else {
            ExReleaseResourceLite(&Fcb->MainResource);
            Locked = FALSE;
            Status = FsRtlCopyWrite(FileObject, FileOffset, Length, Wait,
                                    LockKey, Buffer, IoStatus, DeviceObject);
        }

    } __finally {

        if (Locked) {
            ExReleaseResourceLite(&Fcb->MainResource);
        }

        FsRtlExitFileSystem();
    }

    DEBUG(DL_IO, ("Ext2FastIoWrite: %wZ Offset: %I64xh Length: %xh Key: %xh Status=%d\n",
                   &Fcb->Mcb->ShortName,  FileOffset->QuadPart, Length, LockKey, Status));

    return Status;
}
开发者ID:Uroc327，项目名称:ext2fsd，代码行数:56，代码来源:fastio.c


示例9: FFSRefreshMcb

VOID
FFSRefreshMcb(
	PFFS_VCB Vcb,
	PFFS_MCB Mcb)
{
	ASSERT (IsFlagOn(Mcb->Flags, MCB_IN_TREE));

	RemoveEntryList(&(Mcb->Link));
	InsertTailList(&(Vcb->McbList), &(Mcb->Link));
}
开发者ID:layerfsd，项目名称:ffsfsd，代码行数:10，代码来源:memory.c


示例10: FFSGetPartition

NTSTATUS
FFSGetPartition(
	IN PDEVICE_OBJECT DeviceObject,
	OUT ULONGLONG     *StartOffset)
{
    CHAR                  Buffer[2048];
    PIRP                  Irp;
    IO_STATUS_BLOCK       IoStatus;
    KEVENT                Event;
    NTSTATUS              Status;
    PARTITION_INFORMATION *PartInfo;

    PAGED_CODE();

    if (IsFlagOn(DeviceObject->Characteristics, FILE_FLOPPY_DISKETTE))
    {
        *StartOffset = 0;
        return STATUS_SUCCESS;
    }

    KeInitializeEvent(&Event, NotificationEvent, FALSE);

    Irp = IoBuildDeviceIoControlRequest(
			IOCTL_DISK_GET_PARTITION_INFO,
			DeviceObject,
			NULL,
			0,
			Buffer,
			2048,
			FALSE,
			&Event,
			&IoStatus);

    if (!Irp)
	{
		return STATUS_INSUFFICIENT_RESOURCES;
	}

    Status = IoCallDriver(DeviceObject, Irp);
    if (!NT_SUCCESS(Status))
	{
		return Status;
	}

    Status = KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
    if (!NT_SUCCESS(Status))
	{
		return Status;
	}

    PartInfo = (PARTITION_INFORMATION *)Buffer;
    *StartOffset = PartInfo->StartingOffset.QuadPart;

    return Status;
}
开发者ID:GYGit，项目名称:reactos，代码行数:55，代码来源:fsctl.c


示例11: Ext2DestroyMdl

VOID
Ext2DestroyMdl (IN PMDL Mdl)
{
    ASSERT (Mdl != NULL);
    while (Mdl) {
        PMDL Next;
        Next = Mdl->Next;
        if (IsFlagOn(Mdl->MdlFlags, MDL_PAGES_LOCKED)) {
            MmUnlockPages (Mdl);
        }
        IoFreeMdl (Mdl);
        Mdl = Next;
    }
}
开发者ID:dond2008，项目名称:ext2fsd，代码行数:14，代码来源:block.c


示例12: FFSDeleteMcbNode

BOOLEAN
FFSDeleteMcbNode(
	PFFS_VCB Vcb,
	PFFS_MCB McbTree,
	PFFS_MCB FFSMcb)
{
	PFFS_MCB   TmpMcb;

    PAGED_CODE();

	if(!IsFlagOn(FFSMcb->Flags, MCB_IN_TREE))
	{
		return TRUE;
	}

	if (FFSMcb->Parent)
	{
		if (FFSMcb->Parent->Child == FFSMcb)
		{
			FFSMcb->Parent->Child = FFSMcb->Next;
		}
		else
		{
			TmpMcb = FFSMcb->Parent->Child;

			while (TmpMcb && TmpMcb->Next != FFSMcb)
				TmpMcb = TmpMcb->Next;

			if (TmpMcb)
			{
				TmpMcb->Next = FFSMcb->Next;
			}
			else
			{
				// error
				return FALSE;
			}
		}
	}
	else if (FFSMcb->Child)
	{
		return FALSE;
	}

	RemoveEntryList(&(FFSMcb->Link));
	ClearFlag(FFSMcb->Flags, MCB_IN_TREE);

	return TRUE;
}
开发者ID:GYGit，项目名称:reactos，代码行数:49，代码来源:memory.c


示例13: Ext2FlushFile

NTSTATUS
Ext2FlushFile (
    IN PEXT2_IRP_CONTEXT    IrpContext,
    IN PEXT2_FCB            Fcb,
    IN PEXT2_CCB            Ccb
)
{
    IO_STATUS_BLOCK     IoStatus;

    ASSERT(Fcb != NULL);
    ASSERT((Fcb->Identifier.Type == EXT2FCB) &&
           (Fcb->Identifier.Size == sizeof(EXT2_FCB)));

    _SEH2_TRY {

        /* update timestamp and achieve attribute */
        if (Ccb != NULL) {

            if (!IsFlagOn(Ccb->Flags, CCB_LAST_WRITE_UPDATED)) {

                LARGE_INTEGER   SysTime;
                KeQuerySystemTime(&SysTime);

                Fcb->Inode->i_mtime = Ext2LinuxTime(SysTime);
                Fcb->Mcb->LastWriteTime = Ext2NtTime(Fcb->Inode->i_mtime);
                Ext2SaveInode(IrpContext, Fcb->Vcb, Fcb->Inode);
            }
        }

        if (IsDirectory(Fcb)) {
            IoStatus.Status = STATUS_SUCCESS;
            _SEH2_LEAVE;
        }

        DEBUG(DL_INF, ( "Ext2FlushFile: Flushing File Inode=%xh %S ...\n",
                        Fcb->Inode->i_ino, Fcb->Mcb->ShortName.Buffer));

        CcFlushCache(&(Fcb->SectionObject), NULL, 0, &IoStatus);
        ClearFlag(Fcb->Flags, FCB_FILE_MODIFIED);

    } _SEH2_FINALLY {

        /* do cleanup here */
    } _SEH2_END;

    return IoStatus.Status;
}
开发者ID:GYGit，项目名称:reactos，代码行数:47，代码来源:flush.c


示例14: Ext2StartFloppyFlushDpc

VOID
Ext2StartFloppyFlushDpc (
    PEXT2_VCB   Vcb,
    PEXT2_FCB   Fcb,
    PFILE_OBJECT FileObject )
{
    LARGE_INTEGER          OneSecond;
    PEXT2_FLPFLUSH_CONTEXT Context;

    ASSERT(IsFlagOn(Vcb->Flags, VCB_FLOPPY_DISK));

    Context = Ext2AllocatePool(
                  NonPagedPool,
                  sizeof(EXT2_FLPFLUSH_CONTEXT),
                  EXT2_FLPFLUSH_MAGIC
              );

    if (!Context) {
        DEBUG(DL_ERR, ( "Ex2StartFloppy...: failed to allocate Context\n"));
        DbgBreak();
        return;
    }

    KeInitializeTimer(&Context->Timer);

    KeInitializeDpc( &Context->Dpc,
                     Ext2FloppyFlushDpc,
                     Context );

    ExInitializeWorkItem( &Context->Item,
                          Ext2FloppyFlush,
                          Context );

    Context->Vcb = Vcb;
    Context->Fcb = Fcb;
    Context->FileObject = FileObject;

    if (FileObject) {
        ObReferenceObject(FileObject);
    }

    OneSecond.QuadPart = (LONGLONG)-1*1000*1000*10;
    KeSetTimer( &Context->Timer,
                OneSecond,
                &Context->Dpc );
}
开发者ID:Axure，项目名称:Ext3Fsd，代码行数:46，代码来源:write.c


示例15: Ext2IsFastIoPossible

FAST_IO_POSSIBLE
Ext2IsFastIoPossible(
    IN PEXT2_FCB Fcb
)
{
    FAST_IO_POSSIBLE IsPossible = FastIoIsNotPossible;

    if (!Fcb || !FsRtlOplockIsFastIoPossible(&Fcb->Oplock))
        return IsPossible;

    IsPossible = FastIoIsQuestionable;

    if (!FsRtlAreThereCurrentFileLocks(&Fcb->FileLockAnchor)) {
        if (!IsFlagOn(Fcb->Vcb->Flags, VCB_READ_ONLY)) {
            IsPossible = FastIoIsPossible;
        }
    }

    return IsPossible;
}
开发者ID:Uroc327，项目名称:ext2fsd，代码行数:20，代码来源:fastio.c


示例16: FFSAddMcbNode

VOID
FFSAddMcbNode(
	PFFS_VCB Vcb,
	PFFS_MCB Parent,
	PFFS_MCB Child)
{
	PFFS_MCB TmpMcb = Parent->Child;

    PAGED_CODE();

	if(IsFlagOn(Child->Flags, MCB_IN_TREE))
	{
		FFSBreakPoint();
		FFSPrint((DBG_ERROR, "FFSAddMcbNode: Child Mcb is alreay in the tree.\n"));
		return;
	}

	if (TmpMcb)
	{
		ASSERT(TmpMcb->Parent == Parent);

		while (TmpMcb->Next)
		{
			TmpMcb = TmpMcb->Next;
			ASSERT(TmpMcb->Parent == Parent);
		}

		TmpMcb->Next = Child;
		Child->Parent = Parent;
		Child->Next = NULL;
	}
	else
	{
		Parent->Child = Child;
		Child->Parent = Parent;
		Child->Next = NULL;
	}

	InsertTailList(&(Vcb->McbList), &(Child->Link));
	SetFlag(Child->Flags, MCB_IN_TREE);
}
开发者ID:GYGit，项目名称:reactos，代码行数:41，代码来源:memory.c


示例17: FFSStartFloppyFlushDpc

VOID
FFSStartFloppyFlushDpc(
	PFFS_VCB     Vcb,
	PFFS_FCB     Fcb,
	PFILE_OBJECT FileObject)
{
	LARGE_INTEGER          OneSecond;
	PFFS_FLPFLUSH_CONTEXT Context;

	ASSERT(IsFlagOn(Vcb->Flags, VCB_FLOPPY_DISK));

	Context = ExAllocatePool(NonPagedPool, sizeof(PFFS_FLPFLUSH_CONTEXT));

	if (!Context)
	{
		FFSBreakPoint();
		return;
	}

	KeInitializeTimer(&Context->Timer);

	KeInitializeDpc(&Context->Dpc,
			FFSFloppyFlushDpc,
			Context);

	Context->Vcb = Vcb;
	Context->Fcb = Fcb;
	Context->FileObject = FileObject;

	if (FileObject)
	{
		ObReferenceObject(FileObject);
	}

	OneSecond.QuadPart = (LONGLONG) - 1 * 1000 * 1000 * 10;
	KeSetTimer(&Context->Timer,
			OneSecond,
			&Context->Dpc);
}
开发者ID:layerfsd，项目名称:ffsfsd，代码行数:39，代码来源:write.c


示例18: Ext2CheckJournal

INT
Ext2CheckJournal(
    PEXT2_VCB          Vcb,
    PULONG             jNo
)
{
    struct ext3_super_block* esb = NULL;

    /* check ext3 super block */
    esb = (struct ext3_super_block *)Vcb->SuperBlock;
    if (IsFlagOn(esb->s_feature_incompat,
                 EXT3_FEATURE_INCOMPAT_RECOVER)) {
        SetLongFlag(Vcb->Flags, VCB_JOURNAL_RECOVER);
    }

    /* must stop here if volume is read-only */
    if (IsVcbReadOnly(Vcb)) {
        goto errorout;
    }

    /* journal is external ? */
    if (esb->s_journal_inum == 0) {
        goto errorout;
    }

    /* oops: volume is corrupted */
    if (esb->s_journal_dev) {
        goto errorout;
    }

    /* return the journal inode number */
    *jNo = esb->s_journal_inum;

    return TRUE;

errorout:

    return FALSE;
}
开发者ID:Strongc，项目名称:reactos，代码行数:39，代码来源:recover.c


示例19: FFSWriteVolume

NTSTATUS
FFSWriteVolume(
	IN PFFS_IRP_CONTEXT IrpContext)
{
	NTSTATUS            Status = STATUS_UNSUCCESSFUL;

	PFFS_VCB            Vcb  = NULL;
	PFFS_CCB            Ccb = NULL;
	PFFS_FCBVCB         FcbOrVcb  = NULL;
	PFILE_OBJECT        FileObject  = NULL;

	PDEVICE_OBJECT      DeviceObject  = NULL;

	PIRP                Irp  = NULL;
	PIO_STACK_LOCATION  IoStackLocation  = NULL;

	ULONG               Length;
	LARGE_INTEGER       ByteOffset;

	BOOLEAN             PagingIo;
	BOOLEAN             Nocache;
	BOOLEAN             SynchronousIo;
	BOOLEAN             MainResourceAcquired = FALSE;
	BOOLEAN             PagingIoResourceAcquired = FALSE;

	BOOLEAN             bDeferred = FALSE;

	PUCHAR              Buffer = NULL;

	__try
	{
		ASSERT(IrpContext);

		ASSERT((IrpContext->Identifier.Type == FFSICX) &&
				(IrpContext->Identifier.Size == sizeof(FFS_IRP_CONTEXT)));

		DeviceObject = IrpContext->DeviceObject;

		Vcb = (PFFS_VCB)DeviceObject->DeviceExtension;

		ASSERT(Vcb != NULL);

		ASSERT((Vcb->Identifier.Type == FFSVCB) &&
				(Vcb->Identifier.Size == sizeof(FFS_VCB)));

		FileObject = IrpContext->FileObject;

		FcbOrVcb = (PFFS_FCBVCB)FileObject->FsContext;

		ASSERT(FcbOrVcb);

		if (!(FcbOrVcb->Identifier.Type == FFSVCB && (PVOID)FcbOrVcb == (PVOID)Vcb))
		{
			Status = STATUS_INVALID_DEVICE_REQUEST;
			__leave;
		}

		Ccb = (PFFS_CCB)FileObject->FsContext2;

		Irp = IrpContext->Irp;

		IoStackLocation = IoGetCurrentIrpStackLocation(Irp);

		Length = IoStackLocation->Parameters.Write.Length;
		ByteOffset = IoStackLocation->Parameters.Write.ByteOffset;

		PagingIo = (Irp->Flags & IRP_PAGING_IO ? TRUE : FALSE);
		Nocache = (Irp->Flags & IRP_NOCACHE ? TRUE : FALSE);
		SynchronousIo = (FileObject->Flags & FO_SYNCHRONOUS_IO ? TRUE : FALSE);

		FFSPrint((DBG_INFO, "FFSWriteVolume: Off=%I64xh Len=%xh Paging=%xh Nocache=%xh\n",
					ByteOffset.QuadPart, Length, PagingIo, Nocache));

		if (Length == 0)
		{
			Irp->IoStatus.Information = 0;
			Status = STATUS_SUCCESS;
			__leave;
		}

		// For the case of "Direct Access Storage Device", we
		// need flush/purge the cache

		if (Ccb != NULL)
		{
			ExAcquireResourceExclusive(&Vcb->MainResource, TRUE);
			MainResourceAcquired = TRUE;

			Status = FFSPurgeVolume(Vcb, TRUE);

			ExReleaseResource(&Vcb->MainResource);
			MainResourceAcquired = FALSE;

			if(!IsFlagOn(Ccb->Flags, CCB_ALLOW_EXTENDED_DASD_IO))
			{
				if (ByteOffset.QuadPart + Length > Vcb->Header.FileSize.QuadPart)
				{
					Length = (ULONG)(Vcb->Header.FileSize.QuadPart - ByteOffset.QuadPart);
				}
			}
//.........这里部分代码省略.........
开发者ID:layerfsd，项目名称:ffsfsd，代码行数:101，代码来源:write.c


示例20: FFSWrite

NTSTATUS
FFSWrite(
	IN PFFS_IRP_CONTEXT IrpContext)
{
	NTSTATUS            Status;
	PFFS_FCBVCB         FcbOrVcb;
	PDEVICE_OBJECT      DeviceObject;
	PFILE_OBJECT        FileObject;
	PFFS_VCB            Vcb;
	BOOLEAN             bCompleteRequest = TRUE;

	ASSERT(IrpContext);

	ASSERT((IrpContext->Identifier.Type == FFSICX) &&
			(IrpContext->Identifier.Size == sizeof(FFS_IRP_CONTEXT)));

	__try
	{
		if (FlagOn(IrpContext->MinorFunction, IRP_MN_COMPLETE))
		{
			Status = FFSWriteComplete(IrpContext);
			bCompleteRequest = FALSE;
		}
		else
		{
			DeviceObject = IrpContext->DeviceObject;

			if (DeviceObject == FFSGlobal->DeviceObject)
			{
				Status = STATUS_INVALID_DEVICE_REQUEST;
				__leave;
			}

			Vcb = (PFFS_VCB)DeviceObject->DeviceExtension;

			if (Vcb->Identifier.Type != FFSVCB ||
					Vcb->Identifier.Size != sizeof(FFS_VCB))
			{
				Status = STATUS_INVALID_PARAMETER;
				__leave;
			}

			ASSERT(IsMounted(Vcb));

			if (IsFlagOn(Vcb->Flags, VCB_DISMOUNT_PENDING))
			{
				Status = STATUS_TOO_LATE;
				__leave;
			}

			if (IsFlagOn(Vcb->Flags, VCB_READ_ONLY))
			{
				Status = STATUS_MEDIA_WRITE_PROTECTED;
				__leave;
			}

			FileObject = IrpContext->FileObject;

			FcbOrVcb = (PFFS_FCBVCB)FileObject->FsContext;

			if (FcbOrVcb->Identifier.Type == FFSVCB)
			{
				Status = FFSWriteVolume(IrpContext);

				if (!NT_SUCCESS(Status))
				{
					FFSBreakPoint();
				}

				bCompleteRequest = FALSE;
			}
			else if (FcbOrVcb->Identifier.Type == FFSFCB)
			{
				Status = FFSWriteFile(IrpContext);

				if (!NT_SUCCESS(Status))
				{
					FFSBreakPoint();
				}

				bCompleteRequest = FALSE;
			}
			else
			{
				Status = STATUS_INVALID_PARAMETER;
			}
		}
	}

	__finally
	{
		if (bCompleteRequest)
		{
			FFSCompleteIrpContext(IrpContext, Status);
		}
	}

	return Status;
}
开发者ID:layerfsd，项目名称:ffsfsd，代码行数:99，代码来源:write.c



注：本文中的IsFlagOn函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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