reactos/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 /*
  20  * COPYRIGHT:        See COPYING in the top level directory
  21  * PROJECT:          ReactOS kernel
  22  * FILE:             drivers/fs/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 /* GLOBALS ******************************************************************/
  36
  37 PCDFS_GLOBAL_DATA CdfsGlobalData;
  38
  39
  40 /* FUNCTIONS ****************************************************************/
  41
  42 NTSTATUS NTAPI
  43 DriverEntry(PDRIVER_OBJECT DriverObject,
  44             PUNICODE_STRING RegistryPath)
  45             /*
  46             * FUNCTION: Called by the system to initialize the driver
  47             * ARGUMENTS:
  48             *           DriverObject = object describing this driver
  49             *           RegistryPath = path to our configuration entries
  50             * RETURNS: Success or failure
  51             */
  52 {
  53     PDEVICE_OBJECT DeviceObject;
  54     NTSTATUS Status;
  55     UNICODE_STRING DeviceName = RTL_CONSTANT_STRING(L"\\Cdfs");
  56
  57     UNREFERENCED_PARAMETER(RegistryPath);
  58
  59     DPRINT("CDFS 0.0.3\n");
  60
  61     Status = IoCreateDevice(DriverObject,
  62         sizeof(CDFS_GLOBAL_DATA),
  63         &DeviceName,
  64         FILE_DEVICE_CD_ROM_FILE_SYSTEM,
  65         0,
  66         FALSE,
  67         &DeviceObject);
  68     if (!NT_SUCCESS(Status))
  69     {
  70         return(Status);
  71     }
  72
  73     /* Initialize global data */
  74     CdfsGlobalData = DeviceObject->DeviceExtension;
  75     RtlZeroMemory(CdfsGlobalData,
  76         sizeof(CDFS_GLOBAL_DATA));
  77     CdfsGlobalData->DriverObject = DriverObject;
  78     CdfsGlobalData->DeviceObject = DeviceObject;
  79
  80     /* Initialize driver data */
  81     DeviceObject->Flags = DO_DIRECT_IO;
  82     DriverObject->MajorFunction[IRP_MJ_CLOSE] = CdfsClose;
  83     DriverObject->MajorFunction[IRP_MJ_CLEANUP] = CdfsCleanup;
  84     DriverObject->MajorFunction[IRP_MJ_CREATE] = CdfsCreate;
  85     DriverObject->MajorFunction[IRP_MJ_READ] = CdfsRead;
  86     DriverObject->MajorFunction[IRP_MJ_WRITE] = CdfsWrite;
  87     DriverObject->MajorFunction[IRP_MJ_FILE_SYSTEM_CONTROL] =
  88         CdfsFileSystemControl;
  89     DriverObject->MajorFunction[IRP_MJ_DIRECTORY_CONTROL] =
  90         CdfsDirectoryControl;
  91     DriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION] =
  92         CdfsQueryInformation;
  93     DriverObject->MajorFunction[IRP_MJ_SET_INFORMATION] =
  94         CdfsSetInformation;
  95     DriverObject->MajorFunction[IRP_MJ_QUERY_VOLUME_INFORMATION] =
  96         CdfsQueryVolumeInformation;
  97     DriverObject->MajorFunction[IRP_MJ_SET_VOLUME_INFORMATION] =
  98         CdfsSetVolumeInformation;
  99     DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] =
 100         CdfsDeviceControl;
 101
 102     DriverObject->DriverUnload = NULL;
 103
 104     /* Cache manager */
 105     CdfsGlobalData->CacheMgrCallbacks.AcquireForLazyWrite = CdfsAcquireForLazyWrite;
 106     CdfsGlobalData->CacheMgrCallbacks.ReleaseFromLazyWrite = CdfsReleaseFromLazyWrite;
 107     CdfsGlobalData->CacheMgrCallbacks.AcquireForReadAhead = CdfsAcquireForLazyWrite;
 108     CdfsGlobalData->CacheMgrCallbacks.ReleaseFromReadAhead = CdfsReleaseFromLazyWrite;
 109
 110     DeviceObject->Flags |= DO_LOW_PRIORITY_FILESYSTEM;
 111
 112     IoRegisterFileSystem(DeviceObject);
 113     DeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;
 114
 115     return(STATUS_SUCCESS);
 116 }
 117
 118
 119 BOOLEAN NTAPI
 120 CdfsAcquireForLazyWrite(IN PVOID Context,
 121                         IN BOOLEAN Wait)
 122 {
 123     PFCB Fcb = (PFCB)Context;
 124     ASSERT(Fcb);
 125     DPRINT("CdfsAcquireForLazyWrite(): Fcb %p\n", Fcb);
 126
 127     if (!ExAcquireResourceExclusiveLite(&(Fcb->MainResource), Wait))
 128     {
 129         DPRINT("CdfsAcquireForLazyWrite(): ExReleaseResourceLite failed.\n");
 130         return FALSE;
 131     }
 132     return TRUE;
 133 }
 134
 135 VOID NTAPI
 136 CdfsReleaseFromLazyWrite(IN PVOID Context)
 137 {
 138     PFCB Fcb = (PFCB)Context;
 139     ASSERT(Fcb);
 140     DPRINT("CdfsReleaseFromLazyWrite(): Fcb %p\n", Fcb);
 141
 142     ExReleaseResourceLite(&(Fcb->MainResource));
 143 }