/*++

Copyright (c) 1989  Microsoft Corporation

Module Name:

    Flush.c

Abstract:

    This module implements the File Flush buffers routine for Rx called by the
    dispatch driver.

    In a future version of the wrapper, it may be that flush will be routed thru lowio.

Author:

    Joe Linn     [JoeLinn]    15-dec-1994

Revision History:

--*/

#include "precomp.h"
#pragma hdrstop

//
//  The local debug trace level
//

#define Dbg                              (DEBUG_TRACE_FLUSH)

#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, RxCommonFlushBuffers)
#endif



NTSTATUS
RxCommonFlushBuffers ( 
    IN PRX_CONTEXT RxContext,
    IN PIRP Irp
    )

/*++

Routine Description:

    This is the common routine for flushing file buffers.

Arguments:

    Irp - Supplies the Irp to process

Return Value:

    RXSTATUS - The return status for the operation

--*/

{
    NTSTATUS Status;

    PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );

    PFCB Fcb;
    PFOBX Fobx;
    
    NODE_TYPE_CODE TypeOfOpen;

    PLOWIO_CONTEXT LowIoContext = &RxContext->LowIoContext;
    
    BOOLEAN FcbAcquired = FALSE;

    PAGED_CODE();

    TypeOfOpen = RxDecodeFileObject( IrpSp->FileObject, &Fcb, &Fobx );

    RxDbgTrace( +1, Dbg, ("RxCommonFlush...IrpC %08lx, Fobx %08lx, Fcb %08lx\n",
                                       RxContext, Fobx, Fcb ));
    RxLog(( "%s %lx %lx %lx\n","slF", RxContext, Fcb, Fobx ));
    RxWmiLog( LOG,
              RxCommonFlushBuffers,
              LOGPTR( RxContext )
              LOGPTR( Fcb )
              LOGPTR( Fobx ) );

    //
    //  CcFlushCache is always synchronous, so if we can't wait enqueue
    //  the irp to the Fsp.
    //

    if (!FlagOn( RxContext->Flags, RX_CONTEXT_FLAG_WAIT )) {

        Status = RxFsdPostRequest( RxContext );

        RxDbgTrace( -1, Dbg, ("RxCommonFlushBuffers -> %08lx\n", Status ));
        return Status;
    }

    Status = STATUS_SUCCESS;

    try {

        //
        //  Case on the type of open that we are trying to flush
        //

        switch (TypeOfOpen) {

        case RDBSS_NTC_STORAGE_TYPE_FILE:

            RxDbgTrace( 0, Dbg, ("Flush User File Open\n", 0) );

            Status = RxAcquireExclusiveFcb( RxContext, Fcb );

            if (Status != STATUS_SUCCESS) break;

            FcbAcquired = TRUE;

            //
            //  If the file is cached then flush its cache
            //

            Status = RxFlushFcbInSystemCache( Fcb, TRUE );

            if (!NT_SUCCESS( Status )) break;

            MINIRDR_CALL( Status, RxContext, Fcb->MRxDispatch, MRxFlush, (RxContext) );
            break;

        case RDBSS_NTC_SPOOLFILE:

            RxDbgTrace(0, Dbg, ("Flush Sppol File\n", 0));

            Status = RxAcquireExclusiveFcb( RxContext, Fcb );

            if (Status != STATUS_SUCCESS) break;

            FcbAcquired = TRUE;

            MINIRDR_CALL( Status, RxContext, Fcb->MRxDispatch, MRxFlush, (RxContext) );
            break;

        default:

            Status = STATUS_INVALID_DEVICE_REQUEST;
        }


    } finally {

        DebugUnwind( RxCommonFlushBuffers );

        if (FcbAcquired) { 
            RxReleaseFcb( RxContext, Fcb ); 
        }
    }

    RxDbgTrace(-1, Dbg, ("RxCommonFlushBuffers -> %08lx\n", Status));
    return Status;
}