drivers/filesystems/cdfs/cdfs.c

   1 /*
   2 *  ReactOS kernel
   3 *  Copyright (C) 2002, 2003 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 /* $Id$
  20 *
  21 * COPYRIGHT:        See COPYING in the top level directory
  22 * PROJECT:          ReactOS kernel
  23 * FILE:             drivers/fs/cdfs/cdfs.c
  24 * PURPOSE:          CDROM (ISO 9660) filesystem driver
  25 * PROGRAMMER:       Art Yerkes
  26 *                   Eric Kohl
  27 */
  28
  29 /* INCLUDES *****************************************************************/
  30
  31 #include "cdfs.h"
  32
  33 #define NDEBUG
  34 #include <debug.h>
  35
  36 /* GLOBALS ******************************************************************/
  37
  38 PCDFS_GLOBAL_DATA CdfsGlobalData;
  39
  40
  41 /* FUNCTIONS ****************************************************************/
  42
  43 NTSTATUS NTAPI
  44 DriverEntry(PDRIVER_OBJECT DriverObject,
  45             PUNICODE_STRING RegistryPath)
  46             /*
  47             * FUNCTION: Called by the system to initalize the driver
  48             * ARGUMENTS:
  49             *           DriverObject = object describing this driver
  50             *           RegistryPath = path to our configuration entries
  51             * RETURNS: Success or failure
  52             */
  53 {
  54     PDEVICE_OBJECT DeviceObject;
  55     NTSTATUS Status;
  56     UNICODE_STRING DeviceName = RTL_CONSTANT_STRING(L"\\Cdfs");
  57
  58     DPRINT("CDFS 0.0.3\n");
  59
  60     Status = IoCreateDevice(DriverObject,
  61         sizeof(CDFS_GLOBAL_DATA),
  62         &DeviceName,
  63         FILE_DEVICE_CD_ROM_FILE_SYSTEM,
  64         0,
  65         FALSE,
  66         &DeviceObject);
  67     if (!NT_SUCCESS(Status))
  68     {
  69         return(Status);
  70     }
  71
  72     /* Initialize global data */
  73     CdfsGlobalData = DeviceObject->DeviceExtension;
  74     RtlZeroMemory(CdfsGlobalData,
  75         sizeof(CDFS_GLOBAL_DATA));
  76     CdfsGlobalData->DriverObject = DriverObject;
  77     CdfsGlobalData->DeviceObject = DeviceObject;
  78
  79     /* Initialize driver data */
  80     DeviceObject->Flags = DO_DIRECT_IO;
  81     DriverObject->MajorFunction[IRP_MJ_CLOSE] = CdfsClose;
  82     DriverObject->MajorFunction[IRP_MJ_CLEANUP] = CdfsCleanup;
  83     DriverObject->MajorFunction[IRP_MJ_CREATE] = CdfsCreate;
  84     DriverObject->MajorFunction[IRP_MJ_READ] = CdfsRead;
  85     DriverObject->MajorFunction[IRP_MJ_WRITE] = CdfsWrite;
  86     DriverObject->MajorFunction[IRP_MJ_FILE_SYSTEM_CONTROL] =
  87         CdfsFileSystemControl;
  88     DriverObject->MajorFunction[IRP_MJ_DIRECTORY_CONTROL] =
  89         CdfsDirectoryControl;
  90     DriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION] =
  91         CdfsQueryInformation;
  92     DriverObject->MajorFunction[IRP_MJ_SET_INFORMATION] =
  93         CdfsSetInformation;
  94     DriverObject->MajorFunction[IRP_MJ_QUERY_VOLUME_INFORMATION] =
  95         CdfsQueryVolumeInformation;
  96     DriverObject->MajorFunction[IRP_MJ_SET_VOLUME_INFORMATION] =
  97         CdfsSetVolumeInformation;
  98     DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] =
  99         CdfsDeviceControl;
 100
 101     DriverObject->DriverUnload = NULL;
 102
 103     /* Cache manager */
 104     CdfsGlobalData->CacheMgrCallbacks.AcquireForLazyWrite = CdfsAcquireForLazyWrite;
 105     CdfsGlobalData->CacheMgrCallbacks.ReleaseFromLazyWrite = CdfsReleaseFromLazyWrite;
 106     CdfsGlobalData->CacheMgrCallbacks.AcquireForReadAhead = CdfsAcquireForLazyWrite;
 107     CdfsGlobalData->CacheMgrCallbacks.ReleaseFromReadAhead = CdfsReleaseFromLazyWrite;
 108
 109     DeviceObject->Flags |= DO_LOW_PRIORITY_FILESYSTEM;
 110
 111     IoRegisterFileSystem(DeviceObject);
 112     DeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;
 113
 114     return(STATUS_SUCCESS);
 115 }
 116
 117
 118 BOOLEAN NTAPI
 119 CdfsAcquireForLazyWrite(IN PVOID Context,
 120                         IN BOOLEAN Wait)
 121 {
 122     PFCB Fcb = (PFCB)Context;
 123     ASSERT(Fcb);
 124     DPRINT("CdfsAcquireForLazyWrite(): Fcb %p\n", Fcb);
 125
 126     if (!ExAcquireResourceExclusiveLite(&(Fcb->MainResource), Wait))
 127     {
 128         DPRINT("CdfsAcquireForLazyWrite(): ExReleaseResourceLite failed.\n");
 129         return FALSE;
 130     }
 131     return TRUE;
 132 }
 133
 134 VOID NTAPI
 135 CdfsReleaseFromLazyWrite(IN PVOID Context)
 136 {
 137     PFCB Fcb = (PFCB)Context;
 138     ASSERT(Fcb);
 139     DPRINT("CdfsReleaseFromLazyWrite(): Fcb %p\n", Fcb);
 140
 141     ExReleaseResourceLite(&(Fcb->MainResource));
 142 }