mirror of
https://github.com/reactos/reactos.git
synced 2024-08-29 22:58:34 +00:00
423 lines
9 KiB
C
423 lines
9 KiB
C
/*++
|
|
|
|
Copyright (c) 1989-2000 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
WorkQue.c
|
|
|
|
Abstract:
|
|
|
|
This module implements the Work queue routines for the Cdfs File
|
|
system.
|
|
|
|
|
|
--*/
|
|
|
|
#include "cdprocs.h"
|
|
|
|
//
|
|
// The Bug check file id for this module
|
|
//
|
|
|
|
#define BugCheckFileId (CDFS_BUG_CHECK_WORKQUE)
|
|
|
|
//
|
|
// The following constant is the maximum number of ExWorkerThreads that we
|
|
// will allow to be servicing a particular target device at any one time.
|
|
//
|
|
|
|
#define FSP_PER_DEVICE_THRESHOLD (2)
|
|
|
|
//
|
|
// Local support routines
|
|
//
|
|
|
|
VOID
|
|
CdAddToWorkque (
|
|
_Inout_ PIRP_CONTEXT IrpContext,
|
|
_Inout_ PIRP Irp
|
|
);
|
|
|
|
#ifdef ALLOC_PRAGMA
|
|
#pragma alloc_text(PAGE, CdFsdPostRequest)
|
|
#pragma alloc_text(PAGE, CdOplockComplete)
|
|
#pragma alloc_text(PAGE, CdPrePostIrp)
|
|
#endif
|
|
|
|
|
|
_Requires_lock_held_(_Global_critical_region_)
|
|
NTSTATUS
|
|
CdFsdPostRequest (
|
|
_Inout_ PIRP_CONTEXT IrpContext,
|
|
_Inout_ PIRP Irp
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine enqueues the request packet specified by IrpContext to the
|
|
work queue associated with the FileSystemDeviceObject. This is a FSD
|
|
routine.
|
|
|
|
Arguments:
|
|
|
|
IrpContext - Pointer to the IrpContext to be queued to the Fsp.
|
|
|
|
Irp - I/O Request Packet.
|
|
|
|
Return Value:
|
|
|
|
STATUS_PENDING
|
|
|
|
--*/
|
|
|
|
{
|
|
PAGED_CODE();
|
|
|
|
ASSERT_IRP_CONTEXT( IrpContext );
|
|
ASSERT_IRP( Irp );
|
|
|
|
//
|
|
// Posting is a three step operation. First lock down any buffers
|
|
// in the Irp. Next cleanup the IrpContext for the post and finally
|
|
// add this to a workque.
|
|
//
|
|
|
|
CdPrePostIrp( IrpContext, Irp );
|
|
|
|
CdAddToWorkque( IrpContext, Irp );
|
|
|
|
//
|
|
// And return to our caller
|
|
//
|
|
|
|
return STATUS_PENDING;
|
|
}
|
|
|
|
|
|
|
|
_Requires_lock_held_(_Global_critical_region_)
|
|
VOID
|
|
NTAPI /* ReactOS Change: GCC Does not support STDCALL by default */
|
|
CdPrePostIrp (
|
|
_Inout_ PIRP_CONTEXT IrpContext,
|
|
_Inout_ PIRP Irp
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine performs any neccessary work before STATUS_PENDING is
|
|
returned with the Fsd thread. This routine is called within the
|
|
filesystem and by the oplock package.
|
|
|
|
Arguments:
|
|
|
|
Context - Pointer to the IrpContext to be queued to the Fsp
|
|
|
|
Irp - I/O Request Packet.
|
|
|
|
Return Value:
|
|
|
|
None.
|
|
|
|
--*/
|
|
|
|
{
|
|
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
|
|
BOOLEAN RemovedFcb;
|
|
|
|
PAGED_CODE();
|
|
|
|
ASSERT_IRP_CONTEXT( IrpContext );
|
|
ASSERT_IRP( Irp );
|
|
|
|
//
|
|
// Case on the type of the operation.
|
|
//
|
|
|
|
switch (IrpContext->MajorFunction) {
|
|
|
|
case IRP_MJ_CREATE :
|
|
|
|
//
|
|
// If called from the oplock package then there is an
|
|
// Fcb to possibly teardown. We will call the teardown
|
|
// routine and release the Fcb if still present. The cleanup
|
|
// code in create will know not to release this Fcb because
|
|
// we will clear the pointer.
|
|
//
|
|
|
|
if ((IrpContext->TeardownFcb != NULL) &&
|
|
*(IrpContext->TeardownFcb) != NULL) {
|
|
|
|
CdTeardownStructures( IrpContext, *(IrpContext->TeardownFcb), &RemovedFcb );
|
|
|
|
if (!RemovedFcb) {
|
|
|
|
_Analysis_assume_lock_held_((*IrpContext->TeardownFcb)->FcbNonpaged->FcbResource);
|
|
CdReleaseFcb( IrpContext, *(IrpContext->TeardownFcb) );
|
|
}
|
|
|
|
*(IrpContext->TeardownFcb) = NULL;
|
|
IrpContext->TeardownFcb = NULL;
|
|
}
|
|
|
|
break;
|
|
|
|
//
|
|
// We need to lock the user's buffer, unless this is an MDL read/write,
|
|
// in which case there is no user buffer.
|
|
//
|
|
|
|
case IRP_MJ_READ :
|
|
|
|
if (!FlagOn( IrpContext->MinorFunction, IRP_MN_MDL )) {
|
|
|
|
CdLockUserBuffer( IrpContext, IrpSp->Parameters.Read.Length, IoWriteAccess );
|
|
}
|
|
|
|
break;
|
|
|
|
case IRP_MJ_WRITE :
|
|
|
|
if (!FlagOn( IrpContext->MinorFunction, IRP_MN_MDL )) {
|
|
|
|
CdLockUserBuffer( IrpContext, IrpSp->Parameters.Read.Length, IoReadAccess );
|
|
}
|
|
|
|
break;
|
|
|
|
//
|
|
// We also need to check whether this is a query file operation.
|
|
//
|
|
|
|
case IRP_MJ_DIRECTORY_CONTROL :
|
|
|
|
if (IrpContext->MinorFunction == IRP_MN_QUERY_DIRECTORY) {
|
|
|
|
CdLockUserBuffer( IrpContext, IrpSp->Parameters.QueryDirectory.Length, IoWriteAccess );
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
//
|
|
// Cleanup the IrpContext for the post.
|
|
//
|
|
|
|
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_MORE_PROCESSING );
|
|
CdCleanupIrpContext( IrpContext, TRUE );
|
|
|
|
//
|
|
// Mark the Irp to show that we've already returned pending to the user.
|
|
//
|
|
|
|
IoMarkIrpPending( Irp );
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
_Requires_lock_held_(_Global_critical_region_)
|
|
VOID
|
|
NTAPI /* ReactOS Change: GCC Does not support STDCALL by default */
|
|
CdOplockComplete (
|
|
_Inout_ PIRP_CONTEXT IrpContext,
|
|
_Inout_ PIRP Irp
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine is called by the oplock package when an oplock break has
|
|
completed, allowing an Irp to resume execution. If the status in
|
|
the Irp is STATUS_SUCCESS, then we queue the Irp to the Fsp queue.
|
|
Otherwise we complete the Irp with the status in the Irp.
|
|
|
|
If we are completing due to an error then check if there is any
|
|
cleanup to do.
|
|
|
|
Arguments:
|
|
|
|
Irp - I/O Request Packet.
|
|
|
|
Return Value:
|
|
|
|
None.
|
|
|
|
--*/
|
|
|
|
{
|
|
BOOLEAN RemovedFcb;
|
|
|
|
PAGED_CODE();
|
|
|
|
//
|
|
// Check on the return value in the Irp. If success then we
|
|
// are to post this request.
|
|
//
|
|
|
|
if (Irp->IoStatus.Status == STATUS_SUCCESS) {
|
|
|
|
//
|
|
// Check if there is any cleanup work to do.
|
|
//
|
|
|
|
switch (IrpContext->MajorFunction) {
|
|
|
|
case IRP_MJ_CREATE :
|
|
|
|
//
|
|
// If called from the oplock package then there is an
|
|
// Fcb to possibly teardown. We will call the teardown
|
|
// routine and release the Fcb if still present. The cleanup
|
|
// code in create will know not to release this Fcb because
|
|
// we will clear the pointer.
|
|
//
|
|
|
|
if (IrpContext->TeardownFcb != NULL) {
|
|
|
|
CdTeardownStructures( IrpContext, *(IrpContext->TeardownFcb), &RemovedFcb );
|
|
|
|
if (!RemovedFcb) {
|
|
|
|
_Analysis_assume_lock_held_((*IrpContext->TeardownFcb)->FcbNonpaged->FcbResource);
|
|
CdReleaseFcb( IrpContext, *(IrpContext->TeardownFcb) );
|
|
}
|
|
|
|
*(IrpContext->TeardownFcb) = NULL;
|
|
IrpContext->TeardownFcb = NULL;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
//
|
|
// Insert the Irp context in the workqueue.
|
|
//
|
|
|
|
CdAddToWorkque( IrpContext, Irp );
|
|
|
|
//
|
|
// Otherwise complete the request.
|
|
//
|
|
|
|
} else {
|
|
|
|
CdCompleteRequest( IrpContext, Irp, Irp->IoStatus.Status );
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
//
|
|
// Local support routine
|
|
//
|
|
|
|
VOID
|
|
CdAddToWorkque (
|
|
_Inout_ PIRP_CONTEXT IrpContext,
|
|
_Inout_ PIRP Irp
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine is called to acually store the posted Irp to the Fsp
|
|
workque.
|
|
|
|
Arguments:
|
|
|
|
IrpContext - Pointer to the IrpContext to be queued to the Fsp
|
|
|
|
Irp - I/O Request Packet.
|
|
|
|
Return Value:
|
|
|
|
None.
|
|
|
|
--*/
|
|
|
|
{
|
|
PVOLUME_DEVICE_OBJECT Vdo;
|
|
KIRQL SavedIrql;
|
|
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
|
|
|
|
//
|
|
// Check if this request has an associated file object, and thus volume
|
|
// device object.
|
|
//
|
|
|
|
if (IrpSp->FileObject != NULL) {
|
|
|
|
|
|
Vdo = CONTAINING_RECORD( IrpSp->DeviceObject,
|
|
VOLUME_DEVICE_OBJECT,
|
|
DeviceObject );
|
|
|
|
//
|
|
// Check to see if this request should be sent to the overflow
|
|
// queue. If not, then send it off to an exworker thread.
|
|
//
|
|
|
|
KeAcquireSpinLock( &Vdo->OverflowQueueSpinLock, &SavedIrql );
|
|
|
|
if (Vdo->PostedRequestCount > FSP_PER_DEVICE_THRESHOLD) {
|
|
|
|
//
|
|
// We cannot currently respond to this IRP so we'll just enqueue it
|
|
// to the overflow queue on the volume.
|
|
//
|
|
|
|
InsertTailList( &Vdo->OverflowQueue,
|
|
&IrpContext->WorkQueueItem.List );
|
|
|
|
Vdo->OverflowQueueCount += 1;
|
|
|
|
KeReleaseSpinLock( &Vdo->OverflowQueueSpinLock, SavedIrql );
|
|
|
|
return;
|
|
|
|
} else {
|
|
|
|
//
|
|
// We are going to send this Irp to an ex worker thread so up
|
|
// the count.
|
|
//
|
|
|
|
Vdo->PostedRequestCount += 1;
|
|
|
|
KeReleaseSpinLock( &Vdo->OverflowQueueSpinLock, SavedIrql );
|
|
}
|
|
}
|
|
|
|
//
|
|
// Send it off.....
|
|
//
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma prefast(suppress:28155, "the function prototype is correct")
|
|
#endif
|
|
ExInitializeWorkItem( &IrpContext->WorkQueueItem,
|
|
(PVOID)CdFspDispatch,/* ReactOS Change: GCC "assignment from incompatible pointer type" */
|
|
IrpContext );
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma prefast(suppress: 28159, "prefast believes this routine is obsolete, but it is ok for CDFS to continue using it")
|
|
#endif
|
|
ExQueueWorkItem( &IrpContext->WorkQueueItem, CriticalWorkQueue );
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
|