3 * Copyright (C) 2002 ReactOS Team
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.
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.
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.
19 * COPYRIGHT: See COPYING in the top level directory
20 * PROJECT: ReactOS kernel
21 * FILE: drivers/filesystem/ntfs/rw.c
22 * PURPOSE: NTFS filesystem driver
23 * PROGRAMMER: Art Yerkes
27 /* INCLUDES *****************************************************************/
35 /* GLOBALS *******************************************************************/
37 #define ROUND_UP(N, S) ((((N) + (S) - 1) / (S)) * (S))
38 #define ROUND_DOWN(N, S) ((N) - ((N) % (S)))
40 /* FUNCTIONS ****************************************************************/
43 * FUNCTION: Reads data from a file
47 NtfsReadFile(PDEVICE_EXTENSION DeviceExt
,
48 PFILE_OBJECT FileObject
,
56 NTSTATUS Status
= STATUS_SUCCESS
;
62 DPRINT("CdfsReadFile(ReadOffset %lu Length %lu)\n", ReadOffset
, Length
);
67 return(STATUS_SUCCESS
);
69 Ccb
= (PCCB
)FileObject
->FsContext2
;
70 Fcb
= (PFCB
)FileObject
->FsContext
;
72 if (ReadOffset
>= Fcb
->Entry
.DataLengthL
)
73 return(STATUS_END_OF_FILE
);
75 DPRINT("Reading %d bytes at %d\n", Length
, ReadOffset
);
77 if (!(IrpFlags
& (IRP_NOCACHE
|IRP_PAGING_IO
)))
79 LARGE_INTEGER FileOffset
;
80 IO_STATUS_BLOCK IoStatus
;
82 if (ReadOffset
+ Length
> Fcb
->Entry
.DataLengthL
)
83 Length
= Fcb
->Entry
.DataLengthL
- ReadOffset
;
84 if (FileObject
->PrivateCacheMap
== NULL
)
86 CcRosInitializeFileCache(FileObject
, PAGE_SIZE
);
89 FileOffset
.QuadPart
= (LONGLONG
)ReadOffset
;
90 CcCopyRead(FileObject
,
96 *LengthRead
= IoStatus
.Information
;
98 return(IoStatus
.Status
);
101 if ((ReadOffset
% BLOCKSIZE
) != 0 || (Length
% BLOCKSIZE
) != 0)
103 return STATUS_INVALID_PARAMETER
;
105 if (ReadOffset
+ Length
> ROUND_UP(Fcb
->Entry
.DataLengthL
, BLOCKSIZE
))
106 Length
= ROUND_UP(Fcb
->Entry
.DataLengthL
, BLOCKSIZE
) - ReadOffset
;
108 Status
= CdfsReadSectors(DeviceExt
->StorageDevice
,
109 Fcb
->Entry
.ExtentLocationL
+ (ReadOffset
/ BLOCKSIZE
),
112 if (NT_SUCCESS(Status
))
114 *LengthRead
= Length
;
115 if (Length
+ ReadOffset
> Fcb
->Entry
.DataLengthL
)
117 memset(Buffer
+ Fcb
->Entry
.DataLengthL
- ReadOffset
,
118 0, Length
+ ReadOffset
- Fcb
->Entry
.DataLengthL
);
124 UNREFERENCED_PARAMETER(DeviceExt
);
125 UNREFERENCED_PARAMETER(FileObject
);
126 UNREFERENCED_PARAMETER(Buffer
);
127 UNREFERENCED_PARAMETER(Length
);
128 UNREFERENCED_PARAMETER(ReadOffset
);
129 UNREFERENCED_PARAMETER(IrpFlags
);
131 return STATUS_END_OF_FILE
;
138 NtfsFsdRead(PDEVICE_OBJECT DeviceObject
,
141 PDEVICE_EXTENSION DeviceExt
;
142 PIO_STACK_LOCATION Stack
;
143 PFILE_OBJECT FileObject
;
146 LARGE_INTEGER ReadOffset
;
147 ULONG ReturnedReadLength
= 0;
148 NTSTATUS Status
= STATUS_SUCCESS
;
150 DPRINT("NtfsRead(DeviceObject %x, Irp %x)\n",DeviceObject
,Irp
);
152 DeviceExt
= DeviceObject
->DeviceExtension
;
153 Stack
= IoGetCurrentIrpStackLocation(Irp
);
154 FileObject
= Stack
->FileObject
;
156 ReadLength
= Stack
->Parameters
.Read
.Length
;
157 ReadOffset
= Stack
->Parameters
.Read
.ByteOffset
;
158 Buffer
= MmGetSystemAddressForMdl(Irp
->MdlAddress
);
160 Status
= NtfsReadFile(DeviceExt
,
164 ReadOffset
.u
.LowPart
,
166 &ReturnedReadLength
);
167 if (NT_SUCCESS(Status
))
169 if (FileObject
->Flags
& FO_SYNCHRONOUS_IO
)
171 FileObject
->CurrentByteOffset
.QuadPart
=
172 ReadOffset
.QuadPart
+ ReturnedReadLength
;
175 Irp
->IoStatus
.Information
= ReturnedReadLength
;
179 Irp
->IoStatus
.Information
= 0;
182 Irp
->IoStatus
.Status
= Status
;
183 IoCompleteRequest(Irp
,IO_NO_INCREMENT
);
191 NtfsFsdWrite(PDEVICE_OBJECT DeviceObject
,
194 DPRINT("NtfwWrite(DeviceObject %x Irp %x)\n",DeviceObject
,Irp
);
196 Irp
->IoStatus
.Status
= STATUS_NOT_SUPPORTED
;
197 Irp
->IoStatus
.Information
= 0;
198 return STATUS_NOT_SUPPORTED
;