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 initalize 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     DPRINT("CDFS 0.0.3\n");
  58
  59     Status = IoCreateDevice(DriverObject,
  60         sizeof(CDFS_GLOBAL_DATA),
  61         &DeviceName,
  62         FILE_DEVICE_CD_ROM_FILE_SYSTEM,
  63         0,
  64         FALSE,
  65         &DeviceObject);
  66     if (!NT_SUCCESS(Status))
  67     {
  68         return(Status);
  69     }
  70
  71     /* Initialize global data */
  72     CdfsGlobalData = DeviceObject->DeviceExtension;
  73     RtlZeroMemory(CdfsGlobalData,
  74         sizeof(CDFS_GLOBAL_DATA));
  75     CdfsGlobalData->DriverObject = DriverObject;
  76     CdfsGlobalData->DeviceObject = DeviceObject;
  77
  78     /* Initialize driver data */
  79     DeviceObject->Flags = DO_DIRECT_IO;
  80     DriverObject->MajorFunction[IRP_MJ_CLOSE] = CdfsClose;
  81     DriverObject->MajorFunction[IRP_MJ_CLEANUP] = CdfsCleanup;
  82     DriverObject->MajorFunction[IRP_MJ_CREATE] = CdfsCreate;
  83     DriverObject->MajorFunction[IRP_MJ_READ] = CdfsRead;
  84     DriverObject->MajorFunction[IRP_MJ_WRITE] = CdfsWrite;
  85     DriverObject->MajorFunction[IRP_MJ_FILE_SYSTEM_CONTROL] =
  86         CdfsFileSystemControl;
  87     DriverObject->MajorFunction[IRP_MJ_DIRECTORY_CONTROL] =
  88         CdfsDirectoryControl;
  89     DriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION] =
  90         CdfsQueryInformation;
  91     DriverObject->MajorFunction[IRP_MJ_SET_INFORMATION] =
  92         CdfsSetInformation;
  93     DriverObject->MajorFunction[IRP_MJ_QUERY_VOLUME_INFORMATION] =
  94         CdfsQueryVolumeInformation;
  95     DriverObject->MajorFunction[IRP_MJ_SET_VOLUME_INFORMATION] =
  96         CdfsSetVolumeInformation;
  97     DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] =
  98         CdfsDeviceControl;
  99
 100     DriverObject->DriverUnload = NULL;
 101
 102     /* Cache manager */
 103     CdfsGlobalData->CacheMgrCallbacks.AcquireForLazyWrite = CdfsAcquireForLazyWrite;
 104     CdfsGlobalData->CacheMgrCallbacks.ReleaseFromLazyWrite = CdfsReleaseFromLazyWrite;
 105     CdfsGlobalData->CacheMgrCallbacks.AcquireForReadAhead = CdfsAcquireForLazyWrite;
 106     CdfsGlobalData->CacheMgrCallbacks.ReleaseFromReadAhead = CdfsReleaseFromLazyWrite;
 107
 108     DeviceObject->Flags |= DO_LOW_PRIORITY_FILESYSTEM;
 109
 110     IoRegisterFileSystem(DeviceObject);
 111     DeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;
 112
 113     return(STATUS_SUCCESS);
 114 }
 115
 116
 117 BOOLEAN NTAPI
 118 CdfsAcquireForLazyWrite(IN PVOID Context,
 119                         IN BOOLEAN Wait)
 120 {
 121     PFCB Fcb = (PFCB)Context;
 122     ASSERT(Fcb);
 123     DPRINT("CdfsAcquireForLazyWrite(): Fcb %p\n", Fcb);
 124
 125     if (!ExAcquireResourceExclusiveLite(&(Fcb->MainResource), Wait))
 126     {
 127         DPRINT("CdfsAcquireForLazyWrite(): ExReleaseResourceLite failed.\n");
 128         return FALSE;
 129     }
 130     return TRUE;
 131 }
 132
 133 VOID NTAPI
 134 CdfsReleaseFromLazyWrite(IN PVOID Context)
 135 {
 136     PFCB Fcb = (PFCB)Context;
 137     ASSERT(Fcb);
 138     DPRINT("CdfsReleaseFromLazyWrite(): Fcb %p\n", Fcb);
 139
 140     ExReleaseResourceLite(&(Fcb->MainResource));
 141 }