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