msfssup.c

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/*
 * COPYRIGHT:  See COPYING in the top level directory
 * PROJECT:    ReactOS kernel
 * FILE:       drivers/filesystems/msfs/msfssup.c
 * PURPOSE:    Mailslot filesystem
 * PROGRAMMER: Nikita Pechenkin (n.pechenkin@mail.ru)
 */

/* INCLUDES ******************************************************************/
#include "msfs.h"

#define NDEBUG
#include <debug.h>

/* FUNCTIONS *****************************************************************/

VOID NTAPI
MsfsInsertIrp(PIO_CSQ Csq, PIRP Irp)
{
    PMSFS_FCB Fcb;

    Fcb = CONTAINING_RECORD(Csq, MSFS_FCB, CancelSafeQueue);
    InsertTailList(&Fcb->PendingIrpQueue, &Irp->Tail.Overlay.ListEntry);
}

VOID NTAPI
MsfsRemoveIrp(PIO_CSQ Csq, PIRP Irp)
{
    UNREFERENCED_PARAMETER(Csq);

    RemoveEntryList(&Irp->Tail.Overlay.ListEntry);
}

PIRP NTAPI
MsfsPeekNextIrp(PIO_CSQ Csq, PIRP Irp, PVOID PeekContext)
{
    PMSFS_FCB Fcb;
    PIRP NextIrp = NULL;
    PLIST_ENTRY NextEntry, ListHead;
    PIO_STACK_LOCATION Stack;

    Fcb = CONTAINING_RECORD(Csq, MSFS_FCB, CancelSafeQueue);

    ListHead = &Fcb->PendingIrpQueue;

    if (Irp == NULL)
    {
        NextEntry = ListHead->Flink;
    }
    else
    {
        NextEntry = Irp->Tail.Overlay.ListEntry.Flink;
    }

    for (; NextEntry != ListHead; NextEntry = NextEntry->Flink)
    {
        NextIrp = CONTAINING_RECORD(NextEntry, IRP, Tail.Overlay.ListEntry);

        Stack = IoGetCurrentIrpStackLocation(NextIrp);

        if (PeekContext)
        {
            if (Stack->FileObject == (PFILE_OBJECT)PeekContext)
            {
                break;
            }
        }
        else
        {
            break;
        }

        NextIrp = NULL;
    }

    return NextIrp;
}

VOID NTAPI
MsfsAcquireLock(PIO_CSQ Csq, PKIRQL Irql)
{
    PMSFS_FCB Fcb;

    Fcb = CONTAINING_RECORD(Csq, MSFS_FCB, CancelSafeQueue);
    KeAcquireSpinLock(&Fcb->QueueLock, Irql);
}


VOID NTAPI
MsfsReleaseLock(PIO_CSQ Csq, KIRQL Irql)
{
    PMSFS_FCB Fcb;

    Fcb = CONTAINING_RECORD(Csq, MSFS_FCB, CancelSafeQueue);
    KeReleaseSpinLock(&Fcb->QueueLock, Irql);
}

VOID NTAPI
MsfsCompleteCanceledIrp(PIO_CSQ Csq, PIRP Irp)
{

    UNREFERENCED_PARAMETER(Csq);

    Irp->IoStatus.Status = STATUS_CANCELLED;
    Irp->IoStatus.Information = 0;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
}

VOID NTAPI
MsfsTimeout(PKDPC Dpc,
            PVOID DeferredContext,
            PVOID SystemArgument1,
            PVOID SystemArgument2)
{
    PMSFS_DPC_CTX Context;
    PIRP Irp;

    Context = (PMSFS_DPC_CTX)DeferredContext;

    /* Try to get the IRP */
    Irp = IoCsqRemoveIrp(Context->Csq, &Context->CsqContext);
    if (Irp != NULL)
    {
        /* It timed out, complete it (it's ours) and free context */
        Irp->IoStatus.Status = STATUS_IO_TIMEOUT;
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
        ExFreePoolWithTag(Context, 'NFsM');
    }
    else
    {
        /* We were racing with writing and failed, signal we're done */
        KeSetEvent(&Context->Event, IO_NO_INCREMENT, FALSE);
    }
}

/* EOF */