mirror of
https://github.com/reactos/reactos.git
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296 lines
7.8 KiB
C
296 lines
7.8 KiB
C
/*
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* ReactOS kernel
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* Copyright (C) 2002, 2003, 2004 ReactOS Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: services/fs/cdfs/cdfs.c
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* PURPOSE: CDROM (ISO 9660) filesystem driver
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* PROGRAMMER: Art Yerkes
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* Eric Kohl
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*/
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/* INCLUDES *****************************************************************/
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#include "cdfs.h"
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS ****************************************************************/
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static NTSTATUS
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CdfsMakeAbsoluteFilename(PFILE_OBJECT FileObject,
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PUNICODE_STRING RelativeFileName,
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PUNICODE_STRING AbsoluteFileName)
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{
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USHORT Length;
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PFCB Fcb;
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NTSTATUS Status;
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DPRINT("try related for %wZ\n", RelativeFileName);
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Fcb = FileObject->FsContext;
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ASSERT(Fcb);
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/* verify related object is a directory and target name
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don't start with \. */
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if ((Fcb->Entry.FileFlags & FILE_FLAG_DIRECTORY) == 0 ||
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RelativeFileName->Buffer[0] == L'\\')
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{
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return STATUS_INVALID_PARAMETER;
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}
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/* construct absolute path name */
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Length = Fcb->PathName.Length +
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sizeof(WCHAR) +
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RelativeFileName->Length +
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sizeof(WCHAR);
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AbsoluteFileName->Length = 0;
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AbsoluteFileName->MaximumLength = Length;
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AbsoluteFileName->Buffer = ExAllocatePool(NonPagedPool,
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Length);
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if (AbsoluteFileName->Buffer == NULL)
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{
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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Status = RtlAppendUnicodeStringToString(AbsoluteFileName,
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&Fcb->PathName);
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if (!NT_SUCCESS(Status))
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{
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RtlFreeUnicodeString(AbsoluteFileName);
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return Status;
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}
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if (!CdfsFCBIsRoot(Fcb))
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{
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Status = RtlAppendUnicodeToString(AbsoluteFileName,
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L"\\");
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if (!NT_SUCCESS(Status))
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{
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RtlFreeUnicodeString(AbsoluteFileName);
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return Status;
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}
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}
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Status = RtlAppendUnicodeStringToString(AbsoluteFileName,
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RelativeFileName);
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if (!NT_SUCCESS(Status))
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{
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RtlFreeUnicodeString(AbsoluteFileName);
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return Status;
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}
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return STATUS_SUCCESS;
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}
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/*
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* FUNCTION: Opens a file
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*/
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static NTSTATUS
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CdfsOpenFile(PDEVICE_EXTENSION DeviceExt,
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PFILE_OBJECT FileObject,
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PUNICODE_STRING FileName)
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{
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PFCB ParentFcb;
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PFCB Fcb;
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NTSTATUS Status;
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UNICODE_STRING AbsFileName;
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DPRINT("CdfsOpenFile(%p, %p, %wZ)\n", DeviceExt, FileObject, FileName);
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if (FileObject->RelatedFileObject)
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{
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DPRINT("Converting relative filename to absolute filename\n");
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Status = CdfsMakeAbsoluteFilename(FileObject->RelatedFileObject,
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FileName,
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&AbsFileName);
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if (!NT_SUCCESS(Status))
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{
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return Status;
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}
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FileName = &AbsFileName;
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}
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Status = CdfsDeviceIoControl (DeviceExt->StorageDevice,
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IOCTL_CDROM_CHECK_VERIFY,
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NULL,
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0,
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NULL,
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0,
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FALSE);
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DPRINT ("Status %lx\n", Status);
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if (!NT_SUCCESS(Status))
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{
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if (Status == STATUS_NO_MEDIA_IN_DEVICE || Status == STATUS_VERIFY_REQUIRED)
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{
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DeviceExt->VolumeDevice->Flags |= DO_VERIFY_VOLUME;
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}
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DPRINT1 ("Status %lx\n", Status);
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return Status;
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}
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DPRINT("PathName to open: %wZ\n", FileName);
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/* try first to find an existing FCB in memory */
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DPRINT("Checking for existing FCB in memory\n");
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Fcb = CdfsGrabFCBFromTable(DeviceExt,
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FileName);
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if (Fcb == NULL)
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{
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DPRINT("No existing FCB found, making a new one if file exists.\n");
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Status = CdfsGetFCBForFile(DeviceExt,
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&ParentFcb,
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&Fcb,
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FileName);
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if (ParentFcb != NULL)
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{
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CdfsReleaseFCB(DeviceExt,
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ParentFcb);
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}
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if (!NT_SUCCESS (Status))
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{
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DPRINT("Could not make a new FCB, status: %x\n", Status);
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if (FileName == &AbsFileName)
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RtlFreeUnicodeString(&AbsFileName);
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return Status;
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}
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}
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DPRINT("Attaching FCB to fileObject\n");
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Status = CdfsAttachFCBToFileObject(DeviceExt,
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Fcb,
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FileObject);
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if ((FileName == &AbsFileName) && AbsFileName.Buffer)
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ExFreePool(AbsFileName.Buffer);
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return Status;
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}
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/*
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* FUNCTION: Opens a file
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*/
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static NTSTATUS
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CdfsCreateFile(PDEVICE_OBJECT DeviceObject,
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PIRP Irp)
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{
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PDEVICE_EXTENSION DeviceExt;
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PIO_STACK_LOCATION Stack;
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PFILE_OBJECT FileObject;
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ULONG RequestedDisposition;
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ULONG RequestedOptions;
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PFCB Fcb;
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NTSTATUS Status;
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DPRINT("CdfsCreateFile() called\n");
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DeviceExt = DeviceObject->DeviceExtension;
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ASSERT(DeviceExt);
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Stack = IoGetCurrentIrpStackLocation (Irp);
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ASSERT(Stack);
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RequestedDisposition = ((Stack->Parameters.Create.Options >> 24) & 0xff);
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RequestedOptions = Stack->Parameters.Create.Options & FILE_VALID_OPTION_FLAGS;
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DPRINT("RequestedDisposition %x, RequestedOptions %x\n",
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RequestedDisposition, RequestedOptions);
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FileObject = Stack->FileObject;
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if (RequestedDisposition == FILE_CREATE ||
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RequestedDisposition == FILE_OVERWRITE_IF ||
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RequestedDisposition == FILE_SUPERSEDE)
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{
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return STATUS_ACCESS_DENIED;
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}
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Status = CdfsOpenFile(DeviceExt,
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FileObject,
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&FileObject->FileName);
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if (NT_SUCCESS(Status))
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{
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Fcb = FileObject->FsContext;
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/* Check whether the file has the requested attributes */
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if (RequestedOptions & FILE_NON_DIRECTORY_FILE && CdfsFCBIsDirectory(Fcb))
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{
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CdfsCloseFile (DeviceExt, FileObject);
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return STATUS_FILE_IS_A_DIRECTORY;
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}
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if (RequestedOptions & FILE_DIRECTORY_FILE && !CdfsFCBIsDirectory(Fcb))
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{
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CdfsCloseFile (DeviceExt, FileObject);
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return STATUS_NOT_A_DIRECTORY;
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}
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}
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/*
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* If the directory containing the file to open doesn't exist then
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* fail immediately
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*/
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Irp->IoStatus.Information = (NT_SUCCESS(Status)) ? FILE_OPENED : 0;
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Irp->IoStatus.Status = Status;
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return Status;
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}
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NTSTATUS NTAPI
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CdfsCreate(PDEVICE_OBJECT DeviceObject,
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PIRP Irp)
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{
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PDEVICE_EXTENSION DeviceExt;
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NTSTATUS Status;
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if (DeviceObject == CdfsGlobalData->DeviceObject)
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{
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/* DeviceObject represents FileSystem instead of logical volume */
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DPRINT("Opening file system\n");
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Irp->IoStatus.Information = FILE_OPENED;
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Status = STATUS_SUCCESS;
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goto ByeBye;
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}
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DeviceExt = DeviceObject->DeviceExtension;
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KeEnterCriticalRegion();
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ExAcquireResourceExclusiveLite(&DeviceExt->DirResource,
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TRUE);
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Status = CdfsCreateFile(DeviceObject,
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Irp);
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ExReleaseResourceLite(&DeviceExt->DirResource);
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KeLeaveCriticalRegion();
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ByeBye:
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Irp->IoStatus.Status = Status;
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IoCompleteRequest(Irp,
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NT_SUCCESS(Status) ? IO_DISK_INCREMENT : IO_NO_INCREMENT);
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return Status;
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}
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/* EOF */
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