1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
RawDisp.c
Abstract:
This module is the main entry point for all major function codes.
It is responsible for dispatching the request to the appropriate
routine.
Author:
David Goebel [DavidGoe] 28-Feb-1991
Revision History:
--*/
#include "RawProcs.h"
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, RawDispatch)
#endif
NTSTATUS
RawDispatch (
IN PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
Dispatch the request to the appropriate function. It is the worker
function's responsibility to appropriately complete the IRP.
Arguments:
VolumeDeviceObject - Supplies the volume device object to use.
Irp - Supplies the Irp being processed
Return Value:
NTSTATUS - The status for the IRP
--*/
{
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp;
PVCB Vcb;
PAGED_CODE();
//
// Get a pointer to the current stack location. This location contains
// the function codes and parameters for this particular request.
//
IrpSp = IoGetCurrentIrpStackLocation( Irp );
//
// Check for operations associated with our FileSystemDeviceObjects
// as opposed to our VolumeDeviceObjects. Only mount is allowed to
// continue through the normal dispatch in this case.
//
if ((((PDEVICE_OBJECT)VolumeDeviceObject)->Size == sizeof(DEVICE_OBJECT)) &&
!((IrpSp->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL) &&
(IrpSp->MinorFunction == IRP_MN_MOUNT_VOLUME))) {
if ((IrpSp->MajorFunction == IRP_MJ_CREATE) ||
(IrpSp->MajorFunction == IRP_MJ_CLEANUP) ||
(IrpSp->MajorFunction == IRP_MJ_CLOSE)) {
Status = STATUS_SUCCESS;
} else {
Status = STATUS_INVALID_DEVICE_REQUEST;
}
RawCompleteRequest( Irp, Status );
return Status;
}
FsRtlEnterFileSystem();
//
// Get a pointer to the Vcb. Note that is we are mount a volume this
// pointer will not have meaning, but that is OK since we will not
// use it in that case.
//
Vcb = &VolumeDeviceObject->Vcb;
//
// Case on the function that is being performed by the requestor. We
// should only see expected requests since we filled the dispatch table
// by hand.
//
try {
switch ( IrpSp->MajorFunction ) {
case IRP_MJ_CLEANUP:
Status = RawCleanup( Vcb, Irp, IrpSp );
break;
case IRP_MJ_CLOSE:
Status = RawClose( Vcb, Irp, IrpSp );
break;
case IRP_MJ_CREATE:
Status = RawCreate( Vcb, Irp, IrpSp );
break;
case IRP_MJ_FILE_SYSTEM_CONTROL:
Status = RawFileSystemControl( Vcb, Irp, IrpSp );
break;
case IRP_MJ_READ:
case IRP_MJ_WRITE:
case IRP_MJ_DEVICE_CONTROL:
Status = RawReadWriteDeviceControl( Vcb, Irp, IrpSp );
break;
case IRP_MJ_QUERY_INFORMATION:
Status = RawQueryInformation( Vcb, Irp, IrpSp );
break;
case IRP_MJ_SET_INFORMATION:
Status = RawSetInformation( Vcb, Irp, IrpSp );
break;
case IRP_MJ_QUERY_VOLUME_INFORMATION:
Status = RawQueryVolumeInformation( Vcb, Irp, IrpSp );
break;
default:
//
// We should never get a request we don't expect.
//
KdPrint(("Raw: Illegal Irp major function code 0x%x.\n", IrpSp->MajorFunction));
KeBugCheck( FILE_SYSTEM );
}
} except( FsRtlIsNtstatusExpected(GetExceptionCode()) ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
//
// No routine we call should ever generate an exception
//
Status = GetExceptionCode();
KdPrint(("Raw: Unexpected excpetion %X.\n", Status));
}
//
// And return to our caller
//
FsRtlExitFileSystem();
return Status;
}
//
// Completion routine for read, write, and device control to deal with
// verify issues. Implemented in RawDisp.c
//
NTSTATUS
RawCompletionRoutine(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID Context
)
{
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
//
// Simply update the file pointer context in the file object if we
// were successful and this was a synrhonous read or write.
//
if (((IrpSp->MajorFunction == IRP_MJ_READ) ||
(IrpSp->MajorFunction == IRP_MJ_WRITE)) &&
(IrpSp->FileObject != NULL) &&
FlagOn(IrpSp->FileObject->Flags, FO_SYNCHRONOUS_IO) &&
NT_SUCCESS(Irp->IoStatus.Status)) {
IrpSp->FileObject->CurrentByteOffset.QuadPart =
IrpSp->FileObject->CurrentByteOffset.QuadPart +
Irp->IoStatus.Information;
}
//
// If IoCallDriver returned PENDING, mark our stack location
// with pending.
//
if ( Irp->PendingReturned ) {
IoMarkIrpPending( Irp );
}
UNREFERENCED_PARAMETER( DeviceObject );
UNREFERENCED_PARAMETER( Context );
return STATUS_SUCCESS;
}
|
