510 lines
10 KiB
C
510 lines
10 KiB
C
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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fspdisp.c
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Abstract:
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This file provides the main FSP dispatch routine for the NT browser.
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It mostly provides a switch statement that calls the appropriate BowserFsp
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routine and returns that status to the caller.
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Notes:
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There are two classes of browser FSP worker threads. The first
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are what are called FSP worker threads. These threads are responsible
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for processing NT Irp's passed onto the browser's main work thread.
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In addition to this pool of threads, there is a small pool of "generic"
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worker threads whose sole purpose is to process generic request
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operations. These are used for processing such operations as close
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behind, etc.
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Author:
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Larry Osterman (LarryO) 31-May-1990
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Revision History:
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31-May-1990 LarryO
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Created
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--*/
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#include "precomp.h"
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#pragma hdrstop
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//
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// This defines the granularity of the scavenger timer. If it is set
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// to 30 (for example), the scavenger thread will fire every 30 seconds.
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//
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#define SCAVENGER_TIMER_GRANULARITY 30
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#define UNEXPECTED_TIMER_GRANULARITY (60 * 60 / SCAVENGER_TIMER_GRANULARITY)
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//
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// This counter is used to control kicking the scavenger thread.
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//
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ULONG
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BowserTimerCounter = SCAVENGER_TIMER_GRANULARITY;
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KSPIN_LOCK
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BowserTimeSpinLock = {0};
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VOID
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BowserFspDispatch (
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IN PVOID WorkHeader
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);
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VOID
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BowserScavenger (
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IN PVOID WorkHeader
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);
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VOID
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BowserLogUnexpectedEvents(
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VOID
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, BowserFsdPostToFsp)
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#pragma alloc_text(PAGE, BowserFspDispatch)
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#pragma alloc_text(PAGE, BowserLogUnexpectedEvents)
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#pragma alloc_text(PAGE, BowserScavenger)
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#pragma alloc_text(PAGE, BowserpUninitializeFsp)
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#pragma alloc_text(INIT, BowserpInitializeFsp)
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#endif
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NTSTATUS
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BowserFsdPostToFsp(
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IN PBOWSER_FS_DEVICE_OBJECT DeviceObject,
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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 routine passes the IRP specified onto the FSP work queue, and kicks
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an FSP thread. This routine accepts an I/O Request Packet (IRP) and a
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work queue and passes the request to the appropriate request queue.
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Arguments:
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DeviceObject - Pointer to the device object for this driver.
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Irp - Pointer to the request packet representing the I/O request.
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Return Value:
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The function value is the status of the operation.
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--*/
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{
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PIRP_CONTEXT IrpContext = BowserAllocateIrpContext();
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PAGED_CODE();
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//
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// Mark this I/O request as being pending.
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//
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IoMarkIrpPending(Irp);
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//
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// Queue the request to a generic worker thread.
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//
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IrpContext->Irp = Irp;
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IrpContext->DeviceObject = DeviceObject;
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ExInitializeWorkItem(&IrpContext->WorkHeader, BowserFspDispatch, IrpContext);
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ExQueueWorkItem(&IrpContext->WorkHeader, DelayedWorkQueue);
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return STATUS_PENDING;
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}
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VOID
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BowserFspDispatch (
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IN PVOID WorkHeader
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)
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/*++
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Routine Description:
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BowserFspDispatch is the main dispatch routine for the NT browser's
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FSP. It will process worker requests as queued.
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Arguments:
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DeviceObject - A pointer to the browser DeviceObject
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Return Value:
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None.
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--*/
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{
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PIRP_CONTEXT IrpContext = WorkHeader;
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PIRP Irp = IrpContext->Irp;
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PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
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NTSTATUS Status;
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PBOWSER_FS_DEVICE_OBJECT DeviceObject = IrpContext->DeviceObject;
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PAGED_CODE();
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//
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// We no longer need the IRP context, free it as soon as possible.
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//
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BowserFreeIrpContext(IrpContext);
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dprintf(DPRT_FSPDISP, ("BowserFspDispatch: Got request, Irp = %08lx, "
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"Function = %d\nAux buffer = %08lx\n", Irp, IrpSp->MajorFunction,
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Irp->Tail.Overlay.AuxiliaryBuffer));
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switch (IrpSp->MajorFunction) {
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case IRP_MJ_DEVICE_CONTROL:
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Status = BowserFspDeviceIoControlFile (DeviceObject, Irp);
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break;
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case IRP_MJ_QUERY_INFORMATION:
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Status = BowserFspQueryInformationFile (DeviceObject, Irp);
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break;
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case IRP_MJ_QUERY_VOLUME_INFORMATION:
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Status = BowserFspQueryVolumeInformationFile (DeviceObject, Irp);
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break;
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case IRP_MJ_FILE_SYSTEM_CONTROL:
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case IRP_MJ_CREATE:
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case IRP_MJ_CLEANUP:
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case IRP_MJ_READ:
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case IRP_MJ_WRITE:
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case IRP_MJ_DIRECTORY_CONTROL:
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case IRP_MJ_SET_INFORMATION:
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case IRP_MJ_LOCK_CONTROL:
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case IRP_MJ_FLUSH_BUFFERS:
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case IRP_MJ_QUERY_EA:
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case IRP_MJ_CREATE_NAMED_PIPE:
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case IRP_MJ_CLOSE:
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Status = STATUS_INVALID_DEVICE_REQUEST;
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BowserCompleteRequest(Irp, Status);
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break;
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default:
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InternalError(("Unimplemented function %d\n", IrpSp->MajorFunction));
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Status = STATUS_NOT_IMPLEMENTED;
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BowserCompleteRequest(Irp, Status);
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break;
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}
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return;
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}
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VOID
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BowserIdleTimer (
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IN PDEVICE_OBJECT DeviceObject,
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IN PVOID Context
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)
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/*++
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Routine Description:
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This routine implements the NT redirector's scavenger thread timer.
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It basically waits for the timer granularity and kicks the scavenger
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thread.
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Arguments:
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IN PDEVICE_OBJECT DeviceObject - Supplies the device object for the timer
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IN PVOID Context - Ignored in this routine.
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Return Value:
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None.
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--*/
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{
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KIRQL OldIrql;
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ACQUIRE_SPIN_LOCK(&BowserTimeSpinLock, &OldIrql);
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//
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// Bump the current time counter.
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//
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BowserCurrentTime++;
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if (BowserEventLogResetFrequency != -1) {
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BowserEventLogResetFrequency -= 1;
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if (BowserEventLogResetFrequency < 0) {
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BowserEventLogResetFrequency = BowserData.EventLogResetFrequency;
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BowserIllegalDatagramCount = BowserData.IllegalDatagramThreshold;
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BowserIllegalDatagramThreshold = FALSE;
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}
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}
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//
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// We use the redirector's time spinlock as a convenient spinlock here.
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//
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if (BowserTimerCounter != 0) {
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BowserTimerCounter -= 1;
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if (BowserTimerCounter == 0) {
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PWORK_QUEUE_ITEM WorkHeader;
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RELEASE_SPIN_LOCK(&BowserTimeSpinLock, OldIrql);
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WorkHeader = ALLOCATE_POOL(NonPagedPool, sizeof(WORK_QUEUE_ITEM), POOL_WORKITEM);
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//
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// If the allocation of pool fails, we simply don't queue this
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// request to the scavenger. The scavenger is low priority,
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// thus it isn't a big deal to fail this request.
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//
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if (WorkHeader != NULL) {
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ExInitializeWorkItem(WorkHeader, BowserScavenger, WorkHeader);
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ExQueueWorkItem(WorkHeader, DelayedWorkQueue);
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}
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//
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// Re-acquire the spin lock to make the exit path cleaner.
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//
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ACQUIRE_SPIN_LOCK(&BowserTimeSpinLock, &OldIrql);
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}
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}
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RELEASE_SPIN_LOCK(&BowserTimeSpinLock, OldIrql);
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return;
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UNREFERENCED_PARAMETER(DeviceObject);
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UNREFERENCED_PARAMETER(Context);
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}
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LONG
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UnexpectedEventTimer = UNEXPECTED_TIMER_GRANULARITY;
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VOID
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BowserLogUnexpectedEvents(
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VOID
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)
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{
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LONG TimerSign;
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PAGED_CODE();
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TimerSign = InterlockedDecrement( &UnexpectedEventTimer );
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if ( TimerSign == 0) {
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if (BowserNumberOfMissedMailslotDatagrams > BowserMailslotDatagramThreshold) {
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BowserWriteErrorLogEntry(EVENT_BOWSER_MAILSLOT_DATAGRAM_THRESHOLD_EXCEEDED, STATUS_INSUFFICIENT_RESOURCES, NULL, 0, 0);
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BowserNumberOfMissedMailslotDatagrams = 0;
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}
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if (BowserNumberOfMissedGetBrowserServerListRequests > BowserGetBrowserListThreshold) {
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BowserWriteErrorLogEntry(EVENT_BOWSER_GETBROWSERLIST_THRESHOLD_EXCEEDED, STATUS_INSUFFICIENT_RESOURCES, NULL, 0, 0);
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BowserNumberOfMissedGetBrowserServerListRequests = 0;
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}
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InterlockedExchangeAdd(&UnexpectedEventTimer, UNEXPECTED_TIMER_GRANULARITY );
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}
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}
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VOID
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BowserScavenger (
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IN PVOID Context
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)
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/*++
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Routine Description:
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This function implements the NT browsers's scavenger thread. It
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performs all idle time operations such as closing out dormant connections
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etc.
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Arguments:
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IN PBOWSER_FS_DEVICE_OBJECT DeviceObject - Supplies the device object associated
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with this request.
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Return Value:
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None.
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--*/
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{
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PAGED_CODE();
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dprintf(DPRT_SCAVTHRD, ("BowserTimer\n"));
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//
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// Deallocate the pool used for the work context header - we're done with
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// it.
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//
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FREE_POOL(Context);
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//
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// Remove old entries from the announcetable.
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//
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BowserAgeServerAnnouncements();
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//
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// Log if any of our thresholds have been exceeded.
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//
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BowserLogUnexpectedEvents();
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//
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// Time out any outstanding find master requests if they have taken too
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// long.
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//
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BowserTimeoutFindMasterRequests();
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//
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// Reset the timer counter back to the appropriate value
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// once we have finished processing these requests.
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//
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ExInterlockedAddUlong(&BowserTimerCounter, SCAVENGER_TIMER_GRANULARITY, &BowserTimeSpinLock);
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}
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NTSTATUS
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BowserpInitializeFsp (
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PDRIVER_OBJECT BowserDriverObject
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)
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/*++
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Routine Description:
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This routine initializes the FSP specific components and dispatch
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routines.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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#if 0
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USHORT i;
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//
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// Initialize the driver object with this driver's entry points.
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//
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// By default, pass all requests to the FSD.
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//
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for (i = 0; i <= IRP_MJ_MAXIMUM_FUNCTION; i++) {
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BowserDriverObject->MajorFunction[i] = (PDRIVER_DISPATCH)BowserFsdPostToFsp;
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}
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//
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// Initialize those request that are to be performed in the FSD, not
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// in the FSP.
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//
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BowserDriverObject->MajorFunction[IRP_MJ_CREATE] =
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(PDRIVER_DISPATCH )BowserFsdCreate;
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BowserDriverObject->MajorFunction[IRP_MJ_CLOSE] =
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(PDRIVER_DISPATCH )BowserFsdClose;
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BowserDriverObject->MajorFunction[IRP_MJ_CLEANUP] =
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(PDRIVER_DISPATCH )BowserFsdCleanup;
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BowserDriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION] =
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(PDRIVER_DISPATCH )BowserFsdQueryInformationFile;
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BowserDriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] =
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(PDRIVER_DISPATCH )BowserFsdDeviceIoControlFile;
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#endif
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BowserInitializeIrpContext();
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KeInitializeSpinLock(&BowserTimeSpinLock);
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return STATUS_SUCCESS;
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}
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VOID
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BowserpUninitializeFsp (
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VOID
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)
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/*++
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Routine Description:
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This routine initializes the FSP specific components and dispatch
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routines.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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PAGED_CODE();
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BowserpUninitializeIrpContext();
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return;
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}
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