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1034 lines
26 KiB
1034 lines
26 KiB
/*++
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Copyright (c) 1989-2000 Microsoft Corporation
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Module Name:
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Close.c
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Abstract:
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This module implements the File Close routine for Cdfs called by the
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Fsd/Fsp dispatch routines.
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The close operation interacts with both the async and delayed close queues
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in the CdData structure. Since close may be called recursively we may
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violate the locking order in acquiring the Vcb or Fcb. In this case
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we may move the request to the async close queue. If this is the last
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reference on the Fcb and there is a chance the user may reopen this
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file again soon we would like to defer the close. In this case we
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may move the request to the async close queue.
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Once we are past the decode file operation there is no need for the
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file object. If we are moving the request to either of the work
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queues then we remember all of the information from the file object and
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complete the request with STATUS_SUCCESS. The Io system can then
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reuse the file object and we can complete the request when convenient.
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The async close queue consists of requests which we would like to
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complete as soon as possible. They are queued using the original
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IrpContext where some of the fields have been overwritten with
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information from the file object. We will extract this information,
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cleanup the IrpContext and then call the close worker routine.
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The delayed close queue consists of requests which we would like to
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defer the close for. We keep size of this list within a range
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determined by the size of the system. We let it grow to some maximum
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value and then shrink to some minimum value. We allocate a small
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structure which contains the key information from the file object
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and use this information along with an IrpContext on the stack
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to complete the request.
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// @@BEGIN_DDKSPLIT
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Author:
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Brian Andrew [BrianAn] 01-July-1995
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Revision History:
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// @@END_DDKSPLIT
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--*/
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#include "CdProcs.h"
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//
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// The Bug check file id for this module
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//
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#define BugCheckFileId (CDFS_BUG_CHECK_CLOSE)
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//
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// Local support routines
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//
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BOOLEAN
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CdCommonClosePrivate (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN PFCB Fcb,
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IN ULONG UserReference,
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IN BOOLEAN FromFsd
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);
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VOID
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CdQueueClose (
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IN PIRP_CONTEXT IrpContext,
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IN PFCB Fcb,
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IN ULONG UserReference,
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IN BOOLEAN DelayedClose
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);
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PIRP_CONTEXT
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CdRemoveClose (
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IN PVCB Vcb OPTIONAL
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);
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VOID
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CdCloseWorker (
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IN PDEVICE_OBJECT DeviceObject,
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IN PVOID Context
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, CdCommonClose)
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#pragma alloc_text(PAGE, CdCommonClosePrivate)
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#pragma alloc_text(PAGE, CdQueueClose)
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#pragma alloc_text(PAGE, CdRemoveClose)
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#pragma alloc_text(PAGE, CdCloseWorker)
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#endif
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VOID
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CdFspClose (
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IN PVCB Vcb OPTIONAL
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)
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/*++
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Routine Description:
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This routine is called to process the close queues in the CdData. If the
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Vcb is passed then we want to remove all of the closes for this Vcb.
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Otherwise we will do as many of the delayed closes as we need to do.
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Arguments:
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Vcb - If specified then we are looking for all of the closes for the
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given Vcb.
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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;
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IRP_CONTEXT StackIrpContext;
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THREAD_CONTEXT ThreadContext;
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PFCB Fcb;
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ULONG UserReference;
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ULONG VcbHoldCount = 0;
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PVCB CurrentVcb = NULL;
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BOOLEAN PotentialVcbTeardown = FALSE;
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PAGED_CODE();
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FsRtlEnterFileSystem();
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//
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// Continue processing until there are no more closes to process.
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//
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while (IrpContext = CdRemoveClose( Vcb )) {
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//
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// If we don't have an IrpContext then use the one on the stack.
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// Initialize it for this request.
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//
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if (SafeNodeType( IrpContext ) != CDFS_NTC_IRP_CONTEXT ) {
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//
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// Update the local values from the IrpContextLite.
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//
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Fcb = ((PIRP_CONTEXT_LITE) IrpContext)->Fcb;
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UserReference = ((PIRP_CONTEXT_LITE) IrpContext)->UserReference;
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//
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// Update the stack irp context with the values from the
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// IrpContextLite.
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//
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CdInitializeStackIrpContext( &StackIrpContext,
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(PIRP_CONTEXT_LITE) IrpContext );
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//
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// Free the IrpContextLite.
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//
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CdFreeIrpContextLite( (PIRP_CONTEXT_LITE) IrpContext );
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//
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// Remember we have the IrpContext from the stack.
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//
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IrpContext = &StackIrpContext;
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//
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// Otherwise cleanup the existing IrpContext.
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//
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} else {
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//
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// Remember the Fcb and user reference count.
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//
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Fcb = (PFCB) IrpContext->Irp;
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IrpContext->Irp = NULL;
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UserReference = (ULONG) IrpContext->ExceptionStatus;
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IrpContext->ExceptionStatus = STATUS_SUCCESS;
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}
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//
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// We have an IrpContext. Now we need to set the top level thread
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// context.
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//
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SetFlag( IrpContext->Flags, IRP_CONTEXT_FSP_FLAGS );
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//
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// If we were given a Vcb then there is a request on top of this.
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//
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if (ARGUMENT_PRESENT( Vcb )) {
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ClearFlag( IrpContext->Flags,
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IRP_CONTEXT_FLAG_TOP_LEVEL | IRP_CONTEXT_FLAG_TOP_LEVEL_CDFS );
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}
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CdSetThreadContext( IrpContext, &ThreadContext );
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//
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// If we have hit the maximum number of requests to process without
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// releasing the Vcb then release the Vcb now. If we are holding
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// a different Vcb to this one then release the previous Vcb.
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//
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// In either case acquire the current Vcb.
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//
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// We use the MinDelayedCloseCount from the CdData since it is
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// a convenient value based on the system size. Only thing we are trying
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// to do here is prevent this routine starving other threads which
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// may need this Vcb exclusively.
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//
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// Note that the check for potential teardown below is unsafe. We'll
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// repeat later within the cddata lock.
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//
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PotentialVcbTeardown = !ARGUMENT_PRESENT( Vcb ) &&
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(Fcb->Vcb->VcbCondition != VcbMounted) &&
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(Fcb->Vcb->VcbCondition != VcbMountInProgress) &&
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(Fcb->Vcb->VcbCleanup == 0);
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if (PotentialVcbTeardown ||
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(VcbHoldCount > CdData.MinDelayedCloseCount) ||
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(Fcb->Vcb != CurrentVcb)) {
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if (CurrentVcb != NULL) {
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CdReleaseVcb( IrpContext, CurrentVcb );
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}
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if (PotentialVcbTeardown) {
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CdAcquireCdData( IrpContext );
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//
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// Repeat the checks with global lock held. The volume could have
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// been remounted while we didn't hold the lock.
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//
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PotentialVcbTeardown = !ARGUMENT_PRESENT( Vcb ) &&
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(Fcb->Vcb->VcbCondition != VcbMounted) &&
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(Fcb->Vcb->VcbCondition != VcbMountInProgress) &&
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(Fcb->Vcb->VcbCleanup == 0);
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if (!PotentialVcbTeardown) {
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CdReleaseCdData( IrpContext);
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}
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}
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CurrentVcb = Fcb->Vcb;
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CdAcquireVcbShared( IrpContext, CurrentVcb, FALSE );
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VcbHoldCount = 0;
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} else {
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VcbHoldCount += 1;
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}
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//
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// Call our worker routine to perform the close operation.
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//
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CdCommonClosePrivate( IrpContext, CurrentVcb, Fcb, UserReference, FALSE );
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//
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// If the reference count on this Vcb is below our residual reference
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// then check if we should dismount the volume.
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//
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if (PotentialVcbTeardown) {
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CdReleaseVcb( IrpContext, CurrentVcb );
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CdCheckForDismount( IrpContext, CurrentVcb, FALSE );
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CurrentVcb = NULL;
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CdReleaseCdData( IrpContext );
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PotentialVcbTeardown = FALSE;
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}
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//
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// Complete the current request to cleanup the IrpContext.
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//
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CdCompleteRequest( IrpContext, NULL, STATUS_SUCCESS );
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}
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//
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// Release any Vcb we may still hold.
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//
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if (CurrentVcb != NULL) {
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CdReleaseVcb( IrpContext, CurrentVcb );
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}
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FsRtlExitFileSystem();
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}
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NTSTATUS
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CdCommonClose (
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IN PIRP_CONTEXT IrpContext,
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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 is the Fsd entry for the close operation. We decode the file
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object to find the CDFS structures and type of open. We call our internal
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worker routine to perform the actual work. If the work wasn't completed
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then we post to one of our worker queues. The Ccb isn't needed after this
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point so we delete the Ccb and return STATUS_SUCCESS to our caller in all
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cases.
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Arguments:
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Irp - Supplies the Irp to process
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Return Value:
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STATUS_SUCCESS
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--*/
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{
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TYPE_OF_OPEN TypeOfOpen;
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PVCB Vcb;
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PFCB Fcb;
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PCCB Ccb;
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ULONG UserReference = 0;
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BOOLEAN PotentialVcbTeardown = FALSE;
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BOOLEAN ForceDismount = FALSE;
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PAGED_CODE();
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ASSERT_IRP_CONTEXT( IrpContext );
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ASSERT_IRP( Irp );
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//
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// If we were called with our file system device object instead of a
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// volume device object, just complete this request with STATUS_SUCCESS.
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//
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if (IrpContext->Vcb == NULL) {
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CdCompleteRequest( IrpContext, Irp, STATUS_SUCCESS );
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return STATUS_SUCCESS;
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}
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//
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// Decode the file object to get the type of open and Fcb/Ccb.
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//
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TypeOfOpen = CdDecodeFileObject( IrpContext,
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IoGetCurrentIrpStackLocation( Irp )->FileObject,
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&Fcb,
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&Ccb );
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//
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// No work to do for unopened file objects.
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//
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if (TypeOfOpen == UnopenedFileObject) {
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CdCompleteRequest( IrpContext, Irp, STATUS_SUCCESS );
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return STATUS_SUCCESS;
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}
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Vcb = Fcb->Vcb;
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//
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// Clean up any CCB associated with this open.
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//
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if (Ccb != NULL) {
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UserReference = 1;
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//
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// Was a FSCTL_DISMOUNT issued on this handle? If so, we need to
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// force a dismount of the volume now.
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//
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ForceDismount = BooleanFlagOn( Ccb->Flags, CCB_FLAG_DISMOUNT_ON_CLOSE);
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//
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// We can always deallocate the Ccb if present.
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//
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CdDeleteCcb( IrpContext, Ccb );
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}
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//
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// If this is the last reference to a user file or directory on a
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// currently mounted volume, then post it to the delayed close queue. Note
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// that the VcbCondition check is unsafe, but it doesn't really matter -
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// we just might delay the volume teardown a little by posting this close.
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//
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if ((Vcb->VcbCondition == VcbMounted) &&
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(Fcb->FcbReference == 1) &&
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((TypeOfOpen == UserFileOpen) ||
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(TypeOfOpen == UserDirectoryOpen))) {
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CdQueueClose( IrpContext, Fcb, UserReference, TRUE );
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IrpContext = NULL;
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//
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// Otherwise try to process this close. Post to the async close queue
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// if we can't acquire all of the resources.
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//
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} else {
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//
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// If we may be dismounting this volume then acquire the CdData
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// resource.
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//
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// Since we now must make volumes go away as soon as reasonable after
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// the last user handles closes, key off of the cleanup count. It is
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// OK to do this more than neccesary. Since this Fcb could be holding
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// a number of other Fcbs (and thus their references), a simple check
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// on reference count is not appropriate.
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//
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// Do an unsafe check first to avoid taking the (global) cddata lock in the
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// common case.
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//
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if (((Vcb->VcbCleanup == 0) || ForceDismount) &&
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(Vcb->VcbCondition != VcbMounted)) {
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//
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// Possible. Acquire CdData to synchronise with the remount path, and
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// then repeat the tests.
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//
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// Note that we must send the notification outside of any locks, since
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// the worker that processes the notify could also be calling into our
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// pnp path which wants both CdData and VcbResource. For a force dismount
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// the volume will be marked invalid (no going back), so we will definitely
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// go ahead and dismount below.
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//
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if (ForceDismount) {
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//
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// Send notification.
|
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//
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FsRtlNotifyVolumeEvent( IoGetCurrentIrpStackLocation( Irp )->FileObject,
|
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FSRTL_VOLUME_DISMOUNT );
|
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}
|
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|
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CdAcquireCdData( IrpContext );
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|
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if (((Vcb->VcbCleanup == 0) || ForceDismount) &&
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(Vcb->VcbCondition != VcbMounted) &&
|
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(Vcb->VcbCondition != VcbMountInProgress) &&
|
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FlagOn( IrpContext->Flags, IRP_CONTEXT_FLAG_TOP_LEVEL_CDFS )) {
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PotentialVcbTeardown = TRUE;
|
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}
|
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else {
|
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|
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//
|
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// We can't dismount this volume now, there are other references or
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// it's just been remounted.
|
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//
|
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|
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CdReleaseCdData( IrpContext);
|
|
}
|
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}
|
|
|
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if (ForceDismount) {
|
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|
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//
|
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// Physically disconnect this Vcb from the device so a new mount can
|
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// occur. Vcb deletion cannot happen at this time since there is
|
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// a handle on it associated with this very request, but we'll call
|
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// check for dismount again later anyway.
|
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//
|
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|
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CdCheckForDismount( IrpContext, Vcb, TRUE );
|
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}
|
|
|
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//
|
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// Call the worker routine to perform the actual work. This routine
|
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// should never raise except for a fatal error.
|
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//
|
|
|
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if (!CdCommonClosePrivate( IrpContext, Vcb, Fcb, UserReference, TRUE )) {
|
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|
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//
|
|
// If we didn't complete the request then post the request as needed.
|
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//
|
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|
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CdQueueClose( IrpContext, Fcb, UserReference, FALSE );
|
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IrpContext = NULL;
|
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|
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//
|
|
// Check whether we should be dismounting the volume and then complete
|
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// the request.
|
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//
|
|
|
|
} else if (PotentialVcbTeardown) {
|
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|
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CdCheckForDismount( IrpContext, Vcb, FALSE );
|
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}
|
|
}
|
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|
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//
|
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// Always complete this request with STATUS_SUCCESS.
|
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//
|
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|
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CdCompleteRequest( IrpContext, Irp, STATUS_SUCCESS );
|
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|
|
if (PotentialVcbTeardown) {
|
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|
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CdReleaseCdData( IrpContext );
|
|
}
|
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|
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//
|
|
// Always return STATUS_SUCCESS for closes.
|
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//
|
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|
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return STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
//
|
|
// Local support routine
|
|
//
|
|
|
|
BOOLEAN
|
|
CdCommonClosePrivate (
|
|
IN PIRP_CONTEXT IrpContext,
|
|
IN PVCB Vcb,
|
|
IN PFCB Fcb,
|
|
IN ULONG UserReference,
|
|
IN BOOLEAN FromFsd
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This is the worker routine for the close operation. We can be called in
|
|
an Fsd thread or from a worker Fsp thread. If called from the Fsd thread
|
|
then we acquire the resources without waiting. Otherwise we know it is
|
|
safe to wait.
|
|
|
|
We check to see whether we should post this request to the delayed close
|
|
queue. If we are to process the close here then we acquire the Vcb and
|
|
Fcb. We will adjust the counts and call our teardown routine to see
|
|
if any of the structures should go away.
|
|
|
|
Arguments:
|
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|
|
Vcb - Vcb for this volume.
|
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|
|
Fcb - Fcb for this request.
|
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|
|
UserReference - Number of user references for this file object. This is
|
|
zero for an internal stream.
|
|
|
|
FromFsd - This request was called from an Fsd thread. Indicates whether
|
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we should wait to acquire resources.
|
|
|
|
DelayedClose - Address to store whether we should try to put this on
|
|
the delayed close queue. Ignored if this routine can process this
|
|
close.
|
|
|
|
Return Value:
|
|
|
|
BOOLEAN - TRUE if this thread processed the close, FALSE otherwise.
|
|
|
|
--*/
|
|
|
|
{
|
|
BOOLEAN RemovedFcb;
|
|
|
|
PAGED_CODE();
|
|
|
|
ASSERT_IRP_CONTEXT( IrpContext );
|
|
ASSERT_FCB( Fcb );
|
|
|
|
//
|
|
// Try to acquire the Vcb and Fcb. If we can't acquire them then return
|
|
// and let our caller know he should post the request to the async
|
|
// queue.
|
|
//
|
|
|
|
if (CdAcquireVcbShared( IrpContext, Vcb, FromFsd )) {
|
|
|
|
if (!CdAcquireFcbExclusive( IrpContext, Fcb, FromFsd )) {
|
|
|
|
//
|
|
// We couldn't get the Fcb. Release the Vcb and let our caller
|
|
// know to post this request.
|
|
//
|
|
|
|
CdReleaseVcb( IrpContext, Vcb );
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// We didn't get the Vcb. Let our caller know to post this request.
|
|
//
|
|
|
|
} else {
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// Lock the Vcb and decrement the reference counts.
|
|
//
|
|
|
|
CdLockVcb( IrpContext, Vcb );
|
|
CdDecrementReferenceCounts( IrpContext, Fcb, 1, UserReference );
|
|
CdUnlockVcb( IrpContext, Vcb );
|
|
|
|
//
|
|
// Call our teardown routine to see if this object can go away.
|
|
// If we don't remove the Fcb then release it.
|
|
//
|
|
|
|
CdTeardownStructures( IrpContext, Fcb, &RemovedFcb );
|
|
|
|
if (!RemovedFcb) {
|
|
|
|
CdReleaseFcb( IrpContext, Fcb );
|
|
}
|
|
|
|
//
|
|
// Release the Vcb and return to our caller. Let him know we completed
|
|
// this request.
|
|
//
|
|
|
|
CdReleaseVcb( IrpContext, Vcb );
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
VOID
|
|
CdCloseWorker (
|
|
IN PDEVICE_OBJECT DeviceObject,
|
|
IN PVOID Context
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Worker routine to call CsFspClose.
|
|
|
|
Arguments:
|
|
|
|
DeviceObject - Filesystem registration device object
|
|
|
|
Context - Callers context
|
|
|
|
Return Value:
|
|
|
|
None
|
|
|
|
--*/
|
|
|
|
{
|
|
CdFspClose (NULL);
|
|
}
|
|
|
|
|
|
VOID
|
|
CdQueueClose (
|
|
IN PIRP_CONTEXT IrpContext,
|
|
IN PFCB Fcb,
|
|
IN ULONG UserReference,
|
|
IN BOOLEAN DelayedClose
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine is called to queue a request to either the async or delayed
|
|
close queue. For the delayed queue we need to allocate a smaller
|
|
structure to contain the information about the file object. We do
|
|
that so we don't put the larger IrpContext structures into this long
|
|
lived queue. If we can allocate this structure then we put this
|
|
on the async queue instead.
|
|
|
|
Arguments:
|
|
|
|
Fcb - Fcb for this file object.
|
|
|
|
UserReference - Number of user references for this file object. This is
|
|
zero for an internal stream.
|
|
|
|
DelayedClose - Indicates whether this should go on the async or delayed
|
|
close queue.
|
|
|
|
Return Value:
|
|
|
|
None
|
|
|
|
--*/
|
|
|
|
{
|
|
PIRP_CONTEXT_LITE IrpContextLite = NULL;
|
|
BOOLEAN StartWorker = FALSE;
|
|
|
|
PAGED_CODE();
|
|
|
|
ASSERT_IRP_CONTEXT( IrpContext );
|
|
ASSERT_FCB( Fcb );
|
|
|
|
//
|
|
// Start with the delayed queue request. We can move this to the async
|
|
// queue if there is an allocation failure.
|
|
//
|
|
|
|
if (DelayedClose) {
|
|
|
|
//
|
|
// Try to allocate non-paged pool for the IRP_CONTEXT_LITE.
|
|
//
|
|
|
|
IrpContextLite = CdCreateIrpContextLite( IrpContext );
|
|
}
|
|
|
|
//
|
|
// We want to clear the top level context in this thread if
|
|
// necessary. Call our cleanup routine to do the work.
|
|
//
|
|
|
|
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_MORE_PROCESSING );
|
|
CdCleanupIrpContext( IrpContext, TRUE );
|
|
|
|
//
|
|
// Synchronize with the CdData lock.
|
|
//
|
|
|
|
CdLockCdData();
|
|
|
|
//
|
|
// If we have an IrpContext then put the request on the delayed close queue.
|
|
//
|
|
|
|
if (IrpContextLite != NULL) {
|
|
|
|
//
|
|
// Initialize the IrpContextLite.
|
|
//
|
|
|
|
IrpContextLite->NodeTypeCode = CDFS_NTC_IRP_CONTEXT_LITE;
|
|
IrpContextLite->NodeByteSize = sizeof( IRP_CONTEXT_LITE );
|
|
IrpContextLite->Fcb = Fcb;
|
|
IrpContextLite->UserReference = UserReference;
|
|
IrpContextLite->RealDevice = IrpContext->RealDevice;
|
|
|
|
//
|
|
// Add this to the delayed close list and increment
|
|
// the count.
|
|
//
|
|
|
|
InsertTailList( &CdData.DelayedCloseQueue,
|
|
&IrpContextLite->DelayedCloseLinks );
|
|
|
|
CdData.DelayedCloseCount += 1;
|
|
|
|
//
|
|
// If we are above our threshold then start the delayed
|
|
// close operation.
|
|
//
|
|
|
|
if (CdData.DelayedCloseCount > CdData.MaxDelayedCloseCount) {
|
|
|
|
CdData.ReduceDelayedClose = TRUE;
|
|
|
|
if (!CdData.FspCloseActive) {
|
|
|
|
CdData.FspCloseActive = TRUE;
|
|
StartWorker = TRUE;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Unlock the CdData.
|
|
//
|
|
|
|
CdUnlockCdData();
|
|
|
|
//
|
|
// Cleanup the IrpContext.
|
|
//
|
|
|
|
CdCompleteRequest( IrpContext, NULL, STATUS_SUCCESS );
|
|
|
|
//
|
|
// Otherwise drop into the async case below.
|
|
//
|
|
|
|
} else {
|
|
|
|
//
|
|
// Store the information about the file object into the IrpContext.
|
|
//
|
|
|
|
IrpContext->Irp = (PIRP) Fcb;
|
|
IrpContext->ExceptionStatus = (NTSTATUS) UserReference;
|
|
|
|
//
|
|
// Add this to the async close list and increment the count.
|
|
//
|
|
|
|
InsertTailList( &CdData.AsyncCloseQueue,
|
|
&IrpContext->WorkQueueItem.List );
|
|
|
|
CdData.AsyncCloseCount += 1;
|
|
|
|
//
|
|
// Remember to start the Fsp close thread if not currently started.
|
|
//
|
|
|
|
if (!CdData.FspCloseActive) {
|
|
|
|
CdData.FspCloseActive = TRUE;
|
|
|
|
StartWorker = TRUE;
|
|
}
|
|
|
|
//
|
|
// Unlock the CdData.
|
|
//
|
|
|
|
CdUnlockCdData();
|
|
}
|
|
|
|
//
|
|
// Start the FspClose thread if we need to.
|
|
//
|
|
|
|
if (StartWorker) {
|
|
|
|
IoQueueWorkItem( CdData.CloseItem, CdCloseWorker, CriticalWorkQueue, NULL );
|
|
}
|
|
|
|
//
|
|
// Return to our caller.
|
|
//
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
//
|
|
// Local support routine
|
|
//
|
|
|
|
PIRP_CONTEXT
|
|
CdRemoveClose (
|
|
IN PVCB Vcb OPTIONAL
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Arguments:
|
|
|
|
This routine is called to scan the async and delayed close queues looking
|
|
for a suitable entry. If the Vcb is specified then we scan both queues
|
|
looking for an entry with the same Vcb. Otherwise we will look in the
|
|
async queue first for any close item. If none found there then we look
|
|
in the delayed close queue provided that we have triggered the delayed
|
|
close operation.
|
|
|
|
Return Value:
|
|
|
|
PIRP_CONTEXT - NULL if no work item found. Otherwise it is the pointer to
|
|
either the IrpContext or IrpContextLite for this request.
|
|
|
|
--*/
|
|
|
|
{
|
|
PIRP_CONTEXT IrpContext = NULL;
|
|
PIRP_CONTEXT NextIrpContext;
|
|
PIRP_CONTEXT_LITE NextIrpContextLite;
|
|
|
|
PLIST_ENTRY Entry;
|
|
|
|
PAGED_CODE();
|
|
|
|
ASSERT_OPTIONAL_VCB( Vcb );
|
|
|
|
//
|
|
// Lock the CdData to perform the scan.
|
|
//
|
|
|
|
CdLockCdData();
|
|
|
|
//
|
|
// First check the list of async closes.
|
|
//
|
|
|
|
Entry = CdData.AsyncCloseQueue.Flink;
|
|
|
|
while (Entry != &CdData.AsyncCloseQueue) {
|
|
|
|
//
|
|
// Extract the IrpContext.
|
|
//
|
|
|
|
NextIrpContext = CONTAINING_RECORD( Entry,
|
|
IRP_CONTEXT,
|
|
WorkQueueItem.List );
|
|
|
|
//
|
|
// If no Vcb was specified or this Vcb is for our volume
|
|
// then perform the close.
|
|
//
|
|
|
|
if (!ARGUMENT_PRESENT( Vcb ) || (NextIrpContext->Vcb == Vcb)) {
|
|
|
|
RemoveEntryList( Entry );
|
|
CdData.AsyncCloseCount -= 1;
|
|
|
|
IrpContext = NextIrpContext;
|
|
break;
|
|
}
|
|
|
|
//
|
|
// Move to the next entry.
|
|
//
|
|
|
|
Entry = Entry->Flink;
|
|
}
|
|
|
|
//
|
|
// If we didn't find anything look through the delayed close
|
|
// queue.
|
|
//
|
|
// We will only check the delayed close queue if we were given
|
|
// a Vcb or the delayed close operation is active.
|
|
//
|
|
|
|
if ((IrpContext == NULL) &&
|
|
(ARGUMENT_PRESENT( Vcb ) ||
|
|
(CdData.ReduceDelayedClose &&
|
|
(CdData.DelayedCloseCount > CdData.MinDelayedCloseCount)))) {
|
|
|
|
Entry = CdData.DelayedCloseQueue.Flink;
|
|
|
|
while (Entry != &CdData.DelayedCloseQueue) {
|
|
|
|
//
|
|
// Extract the IrpContext.
|
|
//
|
|
|
|
NextIrpContextLite = CONTAINING_RECORD( Entry,
|
|
IRP_CONTEXT_LITE,
|
|
DelayedCloseLinks );
|
|
|
|
//
|
|
// If no Vcb was specified or this Vcb is for our volume
|
|
// then perform the close.
|
|
//
|
|
|
|
if (!ARGUMENT_PRESENT( Vcb ) || (NextIrpContextLite->Fcb->Vcb == Vcb)) {
|
|
|
|
RemoveEntryList( Entry );
|
|
CdData.DelayedCloseCount -= 1;
|
|
|
|
IrpContext = (PIRP_CONTEXT) NextIrpContextLite;
|
|
break;
|
|
}
|
|
|
|
//
|
|
// Move to the next entry.
|
|
//
|
|
|
|
Entry = Entry->Flink;
|
|
}
|
|
}
|
|
|
|
//
|
|
// If the Vcb wasn't specified and we couldn't find an entry
|
|
// then turn off the Fsp thread.
|
|
//
|
|
|
|
if (!ARGUMENT_PRESENT( Vcb ) && (IrpContext == NULL)) {
|
|
|
|
CdData.FspCloseActive = FALSE;
|
|
CdData.ReduceDelayedClose = FALSE;
|
|
}
|
|
|
|
//
|
|
// Unlock the CdData.
|
|
//
|
|
|
|
CdUnlockCdData();
|
|
|
|
return IrpContext;
|
|
}
|
|
|
|
|