1 /* 2 * ReactOS kernel 3 * Copyright (C) 2002, 2003, 2004 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 along 16 * with this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 18 */ 19 /* 20 * COPYRIGHT: See COPYING in the top level directory 21 * PROJECT: ReactOS kernel 22 * FILE: drivers/filesystems/cdfs/cdfs.c 23 * PURPOSE: CDROM (ISO 9660) filesystem driver 24 * PROGRAMMER: Art Yerkes 25 * Eric Kohl 26 */ 27 28 /* INCLUDES *****************************************************************/ 29 30 #include "cdfs.h" 31 32 #define NDEBUG 33 #include <debug.h> 34 35 /* FUNCTIONS ****************************************************************/ 36 37 static NTSTATUS 38 CdfsMakeAbsoluteFilename(PFILE_OBJECT FileObject, 39 PUNICODE_STRING RelativeFileName, 40 PUNICODE_STRING AbsoluteFileName) 41 { 42 USHORT Length; 43 PFCB Fcb; 44 NTSTATUS Status; 45 46 DPRINT("try related for %wZ\n", RelativeFileName); 47 Fcb = FileObject->FsContext; 48 ASSERT(Fcb); 49 50 /* verify related object is a directory and target name 51 don't start with \. */ 52 if ((Fcb->Entry.FileFlags & FILE_FLAG_DIRECTORY) == 0 || 53 (RelativeFileName->Length >= sizeof(WCHAR) && 54 RelativeFileName->Buffer[0] == L'\\')) 55 { 56 return STATUS_INVALID_PARAMETER; 57 } 58 59 /* construct absolute path name */ 60 Length = Fcb->PathName.Length + 61 sizeof(WCHAR) + 62 RelativeFileName->Length + 63 sizeof(WCHAR); 64 AbsoluteFileName->Length = 0; 65 AbsoluteFileName->MaximumLength = Length; 66 AbsoluteFileName->Buffer = ExAllocatePoolWithTag(NonPagedPool, Length, CDFS_FILENAME_TAG); 67 if (AbsoluteFileName->Buffer == NULL) 68 { 69 return STATUS_INSUFFICIENT_RESOURCES; 70 } 71 72 Status = RtlAppendUnicodeStringToString(AbsoluteFileName, 73 &Fcb->PathName); 74 if (!NT_SUCCESS(Status)) 75 { 76 RtlFreeUnicodeString(AbsoluteFileName); 77 return Status; 78 } 79 80 if (!CdfsFCBIsRoot(Fcb)) 81 { 82 Status = RtlAppendUnicodeToString(AbsoluteFileName, 83 L"\\"); 84 if (!NT_SUCCESS(Status)) 85 { 86 RtlFreeUnicodeString(AbsoluteFileName); 87 return Status; 88 } 89 } 90 91 Status = RtlAppendUnicodeStringToString(AbsoluteFileName, 92 RelativeFileName); 93 if (!NT_SUCCESS(Status)) 94 { 95 RtlFreeUnicodeString(AbsoluteFileName); 96 return Status; 97 } 98 99 return STATUS_SUCCESS; 100 } 101 102 103 /* 104 * FUNCTION: Opens a file 105 */ 106 static NTSTATUS 107 CdfsOpenFile(PDEVICE_EXTENSION DeviceExt, 108 PFILE_OBJECT FileObject, 109 PUNICODE_STRING FileName) 110 { 111 PFCB ParentFcb; 112 PFCB Fcb; 113 NTSTATUS Status; 114 UNICODE_STRING AbsFileName; 115 116 DPRINT("CdfsOpenFile(%p, %p, %wZ)\n", DeviceExt, FileObject, FileName); 117 118 if (FileObject->RelatedFileObject) 119 { 120 DPRINT("Converting relative filename to absolute filename\n"); 121 122 Status = CdfsMakeAbsoluteFilename(FileObject->RelatedFileObject, 123 FileName, 124 &AbsFileName); 125 if (!NT_SUCCESS(Status)) 126 { 127 return Status; 128 } 129 130 FileName = &AbsFileName; 131 } 132 133 Status = CdfsDeviceIoControl (DeviceExt->StorageDevice, 134 IOCTL_CDROM_CHECK_VERIFY, 135 NULL, 136 0, 137 NULL, 138 0, 139 FALSE); 140 DPRINT ("Status %lx\n", Status); 141 if (!NT_SUCCESS(Status)) 142 { 143 DPRINT1 ("Status %lx\n", Status); 144 return Status; 145 } 146 147 DPRINT("PathName to open: %wZ\n", FileName); 148 149 /* try first to find an existing FCB in memory */ 150 DPRINT("Checking for existing FCB in memory\n"); 151 Fcb = CdfsGrabFCBFromTable(DeviceExt, 152 FileName); 153 if (Fcb == NULL) 154 { 155 DPRINT("No existing FCB found, making a new one if file exists.\n"); 156 Status = CdfsGetFCBForFile(DeviceExt, 157 &ParentFcb, 158 &Fcb, 159 FileName); 160 if (ParentFcb != NULL) 161 { 162 CdfsReleaseFCB(DeviceExt, 163 ParentFcb); 164 } 165 166 if (!NT_SUCCESS (Status)) 167 { 168 DPRINT("Could not make a new FCB, status: %x\n", Status); 169 170 if (FileName == &AbsFileName) 171 RtlFreeUnicodeString(&AbsFileName); 172 173 return Status; 174 } 175 } 176 177 DPRINT("Attaching FCB to fileObject\n"); 178 Status = CdfsAttachFCBToFileObject(DeviceExt, 179 Fcb, 180 FileObject); 181 182 if ((FileName == &AbsFileName) && AbsFileName.Buffer) 183 ExFreePoolWithTag(AbsFileName.Buffer, CDFS_FILENAME_TAG); 184 185 return Status; 186 } 187 188 189 /* 190 * FUNCTION: Opens a file 191 */ 192 static NTSTATUS 193 CdfsCreateFile(PDEVICE_OBJECT DeviceObject, 194 PIRP Irp) 195 { 196 PDEVICE_EXTENSION DeviceExt; 197 PIO_STACK_LOCATION Stack; 198 PFILE_OBJECT FileObject; 199 ULONG RequestedDisposition; 200 ULONG RequestedOptions; 201 PFCB Fcb; 202 NTSTATUS Status; 203 204 DPRINT("CdfsCreateFile() called\n"); 205 206 DeviceExt = DeviceObject->DeviceExtension; 207 ASSERT(DeviceExt); 208 Stack = IoGetCurrentIrpStackLocation (Irp); 209 ASSERT(Stack); 210 211 RequestedDisposition = ((Stack->Parameters.Create.Options >> 24) & 0xff); 212 RequestedOptions = Stack->Parameters.Create.Options & FILE_VALID_OPTION_FLAGS; 213 DPRINT("RequestedDisposition %x, RequestedOptions %x\n", 214 RequestedDisposition, RequestedOptions); 215 216 FileObject = Stack->FileObject; 217 218 if (RequestedDisposition == FILE_CREATE || 219 RequestedDisposition == FILE_OVERWRITE_IF || 220 RequestedDisposition == FILE_SUPERSEDE) 221 { 222 return STATUS_ACCESS_DENIED; 223 } 224 225 Status = CdfsOpenFile(DeviceExt, 226 FileObject, 227 &FileObject->FileName); 228 if (NT_SUCCESS(Status)) 229 { 230 Fcb = FileObject->FsContext; 231 232 /* Check whether the file has the requested attributes */ 233 if (RequestedOptions & FILE_NON_DIRECTORY_FILE && CdfsFCBIsDirectory(Fcb)) 234 { 235 CdfsCloseFile (DeviceExt, FileObject); 236 return STATUS_FILE_IS_A_DIRECTORY; 237 } 238 239 if (RequestedOptions & FILE_DIRECTORY_FILE && !CdfsFCBIsDirectory(Fcb)) 240 { 241 CdfsCloseFile (DeviceExt, FileObject); 242 return STATUS_NOT_A_DIRECTORY; 243 } 244 245 DeviceExt->OpenHandleCount++; 246 } 247 248 /* 249 * If the directory containing the file to open doesn't exist then 250 * fail immediately 251 */ 252 Irp->IoStatus.Information = (NT_SUCCESS(Status)) ? FILE_OPENED : 0; 253 254 return Status; 255 } 256 257 258 NTSTATUS NTAPI 259 CdfsCreate( 260 PCDFS_IRP_CONTEXT IrpContext) 261 { 262 PDEVICE_OBJECT DeviceObject; 263 PDEVICE_EXTENSION DeviceExt; 264 NTSTATUS Status; 265 266 DPRINT("CdfsCreate()\n"); 267 268 ASSERT(IrpContext); 269 270 DeviceObject = IrpContext->DeviceObject; 271 DeviceExt = DeviceObject->DeviceExtension; 272 if (BooleanFlagOn(DeviceExt->Flags, VCB_VOLUME_LOCKED)) 273 { 274 return STATUS_ACCESS_DENIED; 275 } 276 277 if (DeviceObject == CdfsGlobalData->CdFsDeviceObject || DeviceObject == CdfsGlobalData->HddFsDeviceObject) 278 { 279 /* DeviceObject represents FileSystem instead of logical volume */ 280 DPRINT("Opening file system\n"); 281 IrpContext->Irp->IoStatus.Information = FILE_OPENED; 282 DeviceExt->OpenHandleCount++; 283 return STATUS_SUCCESS; 284 } 285 286 KeEnterCriticalRegion(); 287 ExAcquireResourceExclusiveLite(&DeviceExt->DirResource, 288 TRUE); 289 Status = CdfsCreateFile(DeviceObject, 290 IrpContext->Irp); 291 ExReleaseResourceLite(&DeviceExt->DirResource); 292 KeLeaveCriticalRegion(); 293 294 return Status; 295 } 296 297 /* EOF */ 298