- Update to r53061
[reactos.git] / drivers / filesystems / ntfs / misc.c
1 /*
2 * ReactOS kernel
3 * Copyright (C) 2008 ReactOS Team
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
18 *
19 * COPYRIGHT: See COPYING in the top level directory
20 * PROJECT: ReactOS kernel
21 * FILE: drivers/filesystem/ntfs/misc.c
22 * PURPOSE: NTFS filesystem driver
23 * PROGRAMMER: Pierre Schweitzer
24 * UPDATE HISTORY:
25 */
26
27 /* INCLUDES *****************************************************************/
28
29 #include "ntfs.h"
30
31 #define NDEBUG
32 #include <debug.h>
33
34 /* GLOBALS *****************************************************************/
35
36
37 /* FUNCTIONS ****************************************************************/
38
39 /*
40 * FUNCTION: Used with IRP to set them to TopLevelIrp field
41 * ARGUMENTS:
42 * Irp = The IRP to set
43 * RETURNS: TRUE if top level was null, else FALSE
44 */
45 BOOLEAN
46 NtfsIsIrpTopLevel(PIRP Irp)
47 {
48 BOOLEAN ReturnCode = FALSE;
49
50 TRACE_(NTFS, "NtfsIsIrpTopLevel()\n");
51
52 if (IoGetTopLevelIrp() == NULL)
53 {
54 IoSetTopLevelIrp(Irp);
55 ReturnCode = TRUE;
56 }
57
58 return ReturnCode;
59 }
60
61 /*
62 * FUNCTION: Allocate and fill an NTFS_IRP_CONTEXT struct in order to use it for IRP
63 * ARGUMENTS:
64 * DeviceObject = Used to fill in struct
65 * Irp = The IRP that need IRP_CONTEXT struct
66 * RETURNS: NULL or PNTFS_IRP_CONTEXT
67 */
68 PNTFS_IRP_CONTEXT
69 NtfsAllocateIrpContext(PDEVICE_OBJECT DeviceObject,
70 PIRP Irp)
71 {
72 PNTFS_IRP_CONTEXT IrpContext;
73 PIO_STACK_LOCATION IoStackLocation;
74
75 TRACE_(NTFS, "NtfsAllocateIrpContext()\n");
76
77 IrpContext = (PNTFS_IRP_CONTEXT)ExAllocatePoolWithTag(NonPagedPool, sizeof(NTFS_IRP_CONTEXT), 'PRIN');
78 if (IrpContext == NULL)
79 return NULL;
80 RtlZeroMemory(IrpContext, sizeof(NTFS_IRP_CONTEXT));
81
82 IrpContext->Identifier.Type = NTFS_TYPE_IRP_CONTEST;
83 IrpContext->Identifier.Size = sizeof(NTFS_IRP_CONTEXT);
84 IrpContext->Irp = Irp;
85 IrpContext->DeviceObject = DeviceObject;
86 if (Irp)
87 {
88 IoStackLocation = IoGetCurrentIrpStackLocation(Irp);
89 ASSERT(IoStackLocation);
90
91 IrpContext->MajorFunction = IoStackLocation->MajorFunction;
92 IrpContext->MinorFunction = IoStackLocation->MinorFunction;
93 IrpContext->IsTopLevel = (IoGetTopLevelIrp() == Irp);
94 }
95
96 return IrpContext;
97 }