BOOLEAN NTAPI Ext2AcqReadAhead	(	IN PVOID	Context,
		IN BOOLEAN	Wait
	)
Definition at line 1001 of file fastio.c.
Referenced by Ext2FsdInitializeFunctionPointers().
{

    BOOLEAN             ReturnedStatus = TRUE;

    PtrExt2FCB          PtrFCB = NULL;
    PtrExt2CCB          PtrCCB = NULL;
    PtrExt2NTRequiredFCB    PtrReqdFCB = NULL;

    // The context is whatever we passed to the Cache Manager when invoking
    // the CcInitializeCacheMaps() function. In the case of the sample FSD
    // implementation, this context is a pointer to the CCB structure.
    
    ASSERT(Context);
    PtrCCB = (PtrExt2CCB)(Context);
    ASSERT(PtrCCB->NodeIdentifier.NodeType == EXT2_NODE_TYPE_CCB);

    DebugTrace(DEBUG_TRACE_IRP_ENTRY,"~~~[FastIO call]~~~  Ext2AcqReadAhead", 0);
    if( PtrCCB && PtrCCB->PtrFileObject )
    {
        DebugTrace(DEBUG_TRACE_FILE_OBJ, "###### File Pointer 0x%LX [FastIO]", PtrCCB->PtrFileObject );
    }

    PtrFCB = PtrCCB->PtrFCB;
    ASSERT(PtrFCB);

    AssertFCB( PtrFCB );
/*
    if( PtrFCB->NodeIdentifier.NodeType != EXT2_NODE_TYPE_FCB )
    {
        //  Ext2BreakPoint();
        DebugTrace(DEBUG_TRACE_ERROR,   "~~~[FastIO call]~~~  Invalid FCB...", 0);
        return TRUE;
    }   */

    PtrReqdFCB = &(PtrFCB->NTRequiredFCB);

    // Acquire the MainResource in the FCB shared.
    // Note: The read-ahead thread typically always supplies WAIT set to TRUE.
    DebugTrace(DEBUG_TRACE_MISC,"*** Attempting to acquire FCB Shared [FastIo]", 0);

    DebugTraceState( "FCBMain   AC:0x%LX   SW:0x%LX   EX:0x%LX   [FastIo]", PtrReqdFCB->MainResource.ActiveCount, PtrReqdFCB->MainResource.NumberOfExclusiveWaiters, PtrReqdFCB->MainResource.NumberOfSharedWaiters );
    if (!ExAcquireResourceSharedLite(&(PtrReqdFCB->MainResource), Wait)) 
    {
        DebugTrace(DEBUG_TRACE_MISC,"*** Attempt to acquire FCB FAILED [FastIo]", 0);
        ReturnedStatus = FALSE;
    }
    else
    {
        DebugTrace(DEBUG_TRACE_MISC,"***  FCB acquired [FastIo]", 0);
    }

    // If your FSD needs to perform some special preparations in anticipation
    // of receving a read-ahead request, do so now.

    return ReturnedStatus;
    
}
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