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178 lines
4.7 KiB
178 lines
4.7 KiB
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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Create.c
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Abstract:
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This module implements the File Create routine for Raw called by the
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dispatch driver.
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Author:
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David Goebel [DavidGoe] 18-Mar-91
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Revision History:
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--*/
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#include "RawProcs.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, RawCreate)
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#endif
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NTSTATUS
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RawCreate (
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IN PVCB Vcb,
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IN PIRP Irp,
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IN PIO_STACK_LOCATION IrpSp
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)
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/*++
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Routine Description:
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Open the volume.
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Arguments:
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Vcb - Supplies the volume being queried.
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Irp - Supplies the Irp being processed.
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IrpSp - Supplies parameters describing the read
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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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BOOLEAN DeleteVolume = FALSE;
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PAGED_CODE();
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//
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// This is an open/create request. The only valid operation that
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// is supported by the RAW file system is if the caller:
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//
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// o Specifies the device itself (file name == ""),
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// o specifies that this is an OPEN operation,
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// o and does not ask to create a directory.
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//
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Status = KeWaitForSingleObject( &Vcb->Mutex,
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Executive,
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KernelMode,
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FALSE,
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(PLARGE_INTEGER) NULL );
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ASSERT( NT_SUCCESS( Status ) );
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//
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// Don't allow any relative opens as well as opens with a filename. These opens have
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// only been checked for traverse access by the I/O manager.
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//
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if (((IrpSp->FileObject == NULL) || ((IrpSp->FileObject->FileName.Length == 0) &&
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IrpSp->FileObject->RelatedFileObject == NULL)) &&
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((IrpSp->Parameters.Create.Options >> 24) == FILE_OPEN) &&
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((IrpSp->Parameters.Create.Options & FILE_DIRECTORY_FILE) == 0)) {
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//
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// If the volume is locked or dismounted we cannot open it again.
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//
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if ( FlagOn(Vcb->VcbState, VCB_STATE_FLAG_LOCKED) ) {
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Status = STATUS_ACCESS_DENIED;
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Irp->IoStatus.Information = 0;
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} if ( FlagOn(Vcb->VcbState, VCB_STATE_FLAG_DISMOUNTED) ) {
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Status = STATUS_VOLUME_DISMOUNTED;
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Irp->IoStatus.Information = 0;
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} else {
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//
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// If the volume is already opened by someone then we need to check
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// the share access
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//
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USHORT ShareAccess;
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ACCESS_MASK DesiredAccess;
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ShareAccess = IrpSp->Parameters.Create.ShareAccess;
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DesiredAccess = IrpSp->Parameters.Create.SecurityContext->DesiredAccess;
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if ((Vcb->OpenCount > 0) &&
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!NT_SUCCESS(Status = IoCheckShareAccess( DesiredAccess,
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ShareAccess,
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IrpSp->FileObject,
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&Vcb->ShareAccess,
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TRUE ))) {
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Irp->IoStatus.Information = 0;
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} else {
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//
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// This is a valid create. Increment the "OpenCount" and
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// stuff the Vpb into the file object.
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//
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if (Vcb->OpenCount == 0) {
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IoSetShareAccess( DesiredAccess,
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ShareAccess,
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IrpSp->FileObject,
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&Vcb->ShareAccess );
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}
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Vcb->OpenCount += 1;
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IrpSp->FileObject->Vpb = Vcb->Vpb;
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Status = STATUS_SUCCESS;
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Irp->IoStatus.Information = FILE_OPENED;
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IrpSp->FileObject->Flags |= FO_NO_INTERMEDIATE_BUFFERING;
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}
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}
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} else {
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//
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// Fail this I/O request since one of the above conditions was
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// not met.
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//
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// KdPrint (("Failing raw open\n"));
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// ASSERT (FALSE);
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Status = STATUS_INVALID_PARAMETER;
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Irp->IoStatus.Information = 0;
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}
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//
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// If this was not successfull and this was the first open on the
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// volume, we must implicitly dis-mount the volume.
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//
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if (!NT_SUCCESS(Status) && (Vcb->OpenCount == 0)) {
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DeleteVolume = RawCheckForDismount( Vcb, TRUE );
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}
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if (!DeleteVolume) {
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(VOID)KeReleaseMutex( &Vcb->Mutex, FALSE );
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}
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RawCompleteRequest( Irp, Status );
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return Status;
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}
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