220 lines
3.6 KiB
C
220 lines
3.6 KiB
C
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/*++
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Copyright (c) 1989 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 NPFS called by the
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dispatch driver.
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Author:
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Gary Kimura [GaryKi] 21-Aug-1990
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Revision History:
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--*/
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#include "NpProcs.h"
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//
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// The debug trace level
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//
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#define Dbg (DEBUG_TRACE_CLOSE)
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//
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// local procedure prototypes
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//
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NTSTATUS
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NpCommonClose (
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IN PNPFS_DEVICE_OBJECT NpfsDeviceObject,
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IN PIRP Irp
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, NpCommonClose)
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#pragma alloc_text(PAGE, NpFsdClose)
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#endif
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NTSTATUS
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NpFsdClose (
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IN PNPFS_DEVICE_OBJECT NpfsDeviceObject,
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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 implements the FSD part of the NtCloseFile API calls.
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Arguments:
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NpfsDeviceObject - Supplies the device object to use.
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Irp - Supplies the Irp being processed
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Return Value:
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NTSTATUS - The Fsd status for the Irp
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--*/
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{
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NTSTATUS Status;
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PAGED_CODE();
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DebugTrace(+1, Dbg, "NpFsdClose\n", 0);
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//
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// Call the common Close routine.
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//
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FsRtlEnterFileSystem();
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Status = NpCommonClose( NpfsDeviceObject, Irp );
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FsRtlExitFileSystem();
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//
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// And return to our caller
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//
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DebugTrace(-1, Dbg, "NpFsdClose -> %08lx\n", Status );
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return Status;
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}
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//
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// Internal support routine
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//
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NTSTATUS
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NpCommonClose (
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IN PNPFS_DEVICE_OBJECT NpfsDeviceObject,
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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 is the common routine for creating/opening a file.
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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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NTSTATUS - the return status for the operation
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--*/
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{
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NTSTATUS Status;
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PIO_STACK_LOCATION IrpSp;
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NODE_TYPE_CODE NodeTypeCode;
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PFCB Fcb;
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PCCB Ccb;
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LIST_ENTRY DeferredList;
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PAGED_CODE();
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InitializeListHead (&DeferredList);
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//
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// Get the current stack location
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//
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IrpSp = IoGetCurrentIrpStackLocation( Irp );
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DebugTrace(+1, Dbg, "NpCommonClose...\n", 0);
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DebugTrace( 0, Dbg, " Irp = %08lx\n", Irp);
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//
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// Now acquire exclusive access to the vcb
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//
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NpAcquireExclusiveVcb();
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//
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// Decode the file object to figure out who we are. If the result
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// is null then the pipe has been disconnected.
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//
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if ((NodeTypeCode = NpDecodeFileObject( IrpSp->FileObject,
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&Fcb,
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&Ccb,
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NULL )) == NTC_UNDEFINED) {
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DebugTrace(0, Dbg, "Pipe is disconnected from us\n", 0);
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} else {
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//
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// Now case on the type of file object we're closing
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//
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switch (NodeTypeCode) {
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case NPFS_NTC_VCB:
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//
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// Decrement the Open count
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//
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NpVcb->OpenCount -= 1;
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break;
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case NPFS_NTC_ROOT_DCB:
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//
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// Decrement the Open count and clear our fields in the file object
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//
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Fcb->OpenCount -= 1;
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//
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// Remove the root dcb ccb.
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//
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NpDeleteCcb (Ccb, &DeferredList);
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break;
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case NPFS_NTC_CCB:
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break;
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}
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}
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//
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// Complete the close irp
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//
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NpReleaseVcb( );
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//
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// Complete any deferred IRPs now we have droped the locks
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//
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NpCompleteDeferredIrps (&DeferredList);
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Status = STATUS_SUCCESS;
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NpCompleteRequest (Irp, Status);
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DebugTrace(-1, Dbg, "NpCommonClose -> %08lx\n", Status);
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return Status;
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}
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