[FS_REC]
[reactos.git] / reactos / drivers / filesystems / msfs / finfo.c
1 /*
2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS kernel
4 * FILE: drivers/filesystems/msfs/finfo.c
5 * PURPOSE: Mailslot filesystem
6 * PROGRAMMER: Eric Kohl
7 */
8
9 /* INCLUDES ******************************************************************/
10
11 #include "msfs.h"
12
13 #define NDEBUG
14 #include <debug.h>
15
16 #undef MAILSLOT_NO_MESSAGE
17 #undef MAILSLOT_WAIT_FOREVER
18 #define MAILSLOT_NO_MESSAGE MAXULONG
19 #define MAILSLOT_WAIT_FOREVER MAXULONG
20
21 /* FUNCTIONS *****************************************************************/
22
23 static NTSTATUS
24 MsfsQueryMailslotInformation(PMSFS_FCB Fcb,
25 PFILE_MAILSLOT_QUERY_INFORMATION Buffer,
26 PULONG BufferLength)
27 {
28 KIRQL oldIrql;
29
30 if (*BufferLength < sizeof(FILE_MAILSLOT_QUERY_INFORMATION))
31 return STATUS_BUFFER_OVERFLOW;
32
33 Buffer->MaximumMessageSize = Fcb->MaxMessageSize;
34 Buffer->ReadTimeout = Fcb->TimeOut;
35
36 KeAcquireSpinLock(&Fcb->MessageListLock, &oldIrql);
37 Buffer->MessagesAvailable = Fcb->MessageCount;
38 if (Fcb->MessageCount == 0)
39 {
40 Buffer->NextMessageSize = MAILSLOT_NO_MESSAGE;
41 }
42 else
43 {
44 PMSFS_MESSAGE Message = CONTAINING_RECORD(Fcb->MessageListHead.Flink,
45 MSFS_MESSAGE,
46 MessageListEntry);
47 Buffer->NextMessageSize = Message->Size;
48 }
49 KeReleaseSpinLock(&Fcb->MessageListLock, oldIrql);
50
51 *BufferLength -= sizeof(FILE_MAILSLOT_QUERY_INFORMATION);
52
53 return STATUS_SUCCESS;
54 }
55
56
57 static NTSTATUS
58 MsfsSetMailslotInformation(PMSFS_FCB Fcb,
59 PFILE_MAILSLOT_SET_INFORMATION Buffer,
60 PULONG BufferLength)
61 {
62 if (*BufferLength < sizeof(FILE_MAILSLOT_SET_INFORMATION))
63 return STATUS_BUFFER_OVERFLOW;
64
65 Fcb->TimeOut = *Buffer->ReadTimeout;
66
67 return STATUS_SUCCESS;
68 }
69
70
71 NTSTATUS DEFAULTAPI
72 MsfsQueryInformation(PDEVICE_OBJECT DeviceObject,
73 PIRP Irp)
74 {
75 PIO_STACK_LOCATION IoStack;
76 FILE_INFORMATION_CLASS FileInformationClass;
77 PFILE_OBJECT FileObject;
78 PMSFS_FCB Fcb;
79 PMSFS_CCB Ccb;
80 PVOID SystemBuffer;
81 ULONG BufferLength;
82 NTSTATUS Status;
83
84 DPRINT("MsfsQueryInformation(DeviceObject %p Irp %p)\n",
85 DeviceObject, Irp);
86
87 IoStack = IoGetCurrentIrpStackLocation (Irp);
88 FileInformationClass = IoStack->Parameters.QueryFile.FileInformationClass;
89 FileObject = IoStack->FileObject;
90 Fcb = (PMSFS_FCB)FileObject->FsContext;
91 Ccb = (PMSFS_CCB)FileObject->FsContext2;
92
93 DPRINT("Mailslot name: %wZ\n", &Fcb->Name);
94
95 /* querying information is not permitted on client side */
96 if (Fcb->ServerCcb != Ccb)
97 {
98 Status = STATUS_ACCESS_DENIED;
99
100 Irp->IoStatus.Status = Status;
101 Irp->IoStatus.Information = 0;
102
103 IoCompleteRequest(Irp, IO_NO_INCREMENT);
104
105 return Status;
106 }
107
108 SystemBuffer = Irp->AssociatedIrp.SystemBuffer;
109 BufferLength = IoStack->Parameters.QueryFile.Length;
110
111 switch (FileInformationClass)
112 {
113 case FileMailslotQueryInformation:
114 Status = MsfsQueryMailslotInformation(Fcb,
115 SystemBuffer,
116 &BufferLength);
117 break;
118
119 default:
120 Status = STATUS_NOT_IMPLEMENTED;
121 }
122
123 Irp->IoStatus.Status = Status;
124 if (NT_SUCCESS(Status))
125 Irp->IoStatus.Information =
126 IoStack->Parameters.QueryFile.Length - BufferLength;
127 else
128 Irp->IoStatus.Information = 0;
129 IoCompleteRequest(Irp, IO_NO_INCREMENT);
130
131 return Status;
132 }
133
134
135 NTSTATUS DEFAULTAPI
136 MsfsSetInformation(PDEVICE_OBJECT DeviceObject,
137 PIRP Irp)
138 {
139 PIO_STACK_LOCATION IoStack;
140 FILE_INFORMATION_CLASS FileInformationClass;
141 PFILE_OBJECT FileObject;
142 PMSFS_FCB Fcb;
143 PMSFS_CCB Ccb;
144 PVOID SystemBuffer;
145 ULONG BufferLength;
146 NTSTATUS Status;
147
148 DPRINT("MsfsSetInformation(DeviceObject %p Irp %p)\n", DeviceObject, Irp);
149
150 IoStack = IoGetCurrentIrpStackLocation (Irp);
151 FileInformationClass = IoStack->Parameters.QueryFile.FileInformationClass;
152 FileObject = IoStack->FileObject;
153 Fcb = (PMSFS_FCB)FileObject->FsContext;
154 Ccb = (PMSFS_CCB)FileObject->FsContext2;
155
156 DPRINT("Mailslot name: %wZ\n", &Fcb->Name);
157
158 /* setting information is not permitted on client side */
159 if (Fcb->ServerCcb != Ccb)
160 {
161 Status = STATUS_ACCESS_DENIED;
162
163 Irp->IoStatus.Status = Status;
164 Irp->IoStatus.Information = 0;
165
166 IoCompleteRequest(Irp, IO_NO_INCREMENT);
167
168 return Status;
169 }
170
171 SystemBuffer = Irp->AssociatedIrp.SystemBuffer;
172 BufferLength = IoStack->Parameters.QueryFile.Length;
173
174 DPRINT("FileInformationClass %d\n", FileInformationClass);
175 DPRINT("SystemBuffer %p\n", SystemBuffer);
176
177 switch (FileInformationClass)
178 {
179 case FileMailslotSetInformation:
180 Status = MsfsSetMailslotInformation(Fcb,
181 SystemBuffer,
182 &BufferLength);
183 break;
184
185 default:
186 Status = STATUS_NOT_IMPLEMENTED;
187 }
188
189 Irp->IoStatus.Status = Status;
190 Irp->IoStatus.Information = 0;
191 IoCompleteRequest(Irp, IO_NO_INCREMENT);
192
193 return Status;
194 }
195
196 /* EOF */