drivers/fs/ext2/super.c

   1 /*
   2  * COPYRIGHT:        See COPYING in the top level directory
   3  * PROJECT:          ReactOS kernel
   4  * FILE:             services/fs/ext2/super.c
   5  * PURPOSE:          ext2 filesystem
   6  * PROGRAMMER:       David Welch (welch@mcmail.com)
   7  * UPDATE HISTORY:
   8  */
   9
  10 /* INCLUDES *****************************************************************/
  11
  12 #include <ddk/ntddk.h>
  13
  14 //#define NDEBUG
  15 #include <debug.h>
  16
  17 #include "ext2fs.h"
  18
  19 /* GLOBALS *****************************************************************/
  20
  21 static PDRIVER_OBJECT DriverObject;
  22
  23 /* FUNCTIONS ****************************************************************/
  24
  25 NTSTATUS STDCALL
  26 Ext2Close(PDEVICE_OBJECT DeviceObject, PIRP Irp)
  27 {
  28    PIO_STACK_LOCATION Stack;
  29    PFILE_OBJECT FileObject;
  30    PDEVICE_EXTENSION DeviceExtension;
  31    NTSTATUS Status;
  32    PEXT2_FCB Fcb;
  33
  34    DbgPrint("Ext2Close(DeviceObject %x, Irp %x)\n",DeviceObject,Irp);
  35
  36    Stack = IoGetCurrentIrpStackLocation(Irp);
  37    FileObject = Stack->FileObject;
  38    DeviceExtension = DeviceObject->DeviceExtension;
  39
  40    if (FileObject == DeviceExtension->FileObject)
  41      {
  42         Status = STATUS_SUCCESS;
  43
  44         Irp->IoStatus.Status = Status;
  45         Irp->IoStatus.Information = 0;
  46
  47         IoCompleteRequest(Irp, IO_NO_INCREMENT);
  48         return(Status);
  49      }
  50
  51    Fcb = (PEXT2_FCB)FileObject->FsContext;
  52    if (Fcb != NULL)
  53      {
  54         if (Fcb->Bcb != NULL)
  55           {
  56              CcRosReleaseFileCache(FileObject, Fcb->Bcb);
  57           }
  58         ExFreePool(Fcb);
  59         FileObject->FsContext = NULL;
  60      }
  61
  62    Status = STATUS_SUCCESS;
  63
  64    Irp->IoStatus.Status = Status;
  65    Irp->IoStatus.Information = 0;
  66
  67    IoCompleteRequest(Irp, IO_NO_INCREMENT);
  68    return(Status);
  69 }
  70
  71 NTSTATUS Ext2Mount(PDEVICE_OBJECT DeviceToMount)
  72 {
  73    PDEVICE_OBJECT DeviceObject;
  74    PDEVICE_EXTENSION DeviceExt;
  75    PVOID BlockBuffer;
  76    struct ext2_super_block* superblock;
  77
  78    DPRINT("Ext2Mount(DeviceToMount %x)\n",DeviceToMount);
  79
  80    BlockBuffer = ExAllocatePool(NonPagedPool,BLOCKSIZE);
  81    Ext2ReadSectors(DeviceToMount,
  82                    1,
  83                    1,
  84                    BlockBuffer);
  85    superblock = BlockBuffer;
  86
  87    if (superblock->s_magic != EXT2_SUPER_MAGIC)
  88      {
  89         ExFreePool(BlockBuffer);
  90         return(STATUS_UNRECOGNIZED_VOLUME);
  91      }
  92    DPRINT("Volume recognized\n");
  93    DPRINT("s_inodes_count %d\n",superblock->s_inodes_count);
  94    DPRINT("s_blocks_count %d\n",superblock->s_blocks_count);
  95
  96    IoCreateDevice(DriverObject,
  97                   sizeof(DEVICE_EXTENSION),
  98                   NULL,
  99                   FILE_DEVICE_FILE_SYSTEM,
 100                   0,
 101                   FALSE,
 102                   &DeviceObject);
 103    DPRINT("DeviceObject %x\n",DeviceObject);
 104    DeviceObject->Flags = DeviceObject->Flags | DO_DIRECT_IO;
 105    DeviceExt = (PVOID)DeviceObject->DeviceExtension;
 106    DPRINT("DeviceExt %x\n",DeviceExt);
 107
 108   DeviceExt->StorageDevice = DeviceToMount;
 109   DeviceExt->StorageDevice->Vpb->DeviceObject = DeviceObject;
 110   DeviceExt->StorageDevice->Vpb->RealDevice = DeviceExt->StorageDevice;
 111   DeviceExt->StorageDevice->Vpb->Flags |= VPB_MOUNTED;
 112   DeviceObject->StackSize = DeviceExt->StorageDevice->StackSize + 1;
 113   DeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;
 114
 115    DPRINT("DeviceExt->StorageDevice %x\n", DeviceExt->StorageDevice);
 116    DeviceExt->FileObject = IoCreateStreamFileObject(NULL, DeviceObject);
 117    DeviceExt->superblock = superblock;
 118    CcRosInitializeFileCache(DeviceExt->FileObject,
 119                             &DeviceExt->Bcb,
 120                             PAGE_SIZE * 3);
 121
 122    DPRINT("Ext2Mount() = STATUS_SUCCESS\n");
 123
 124    return(STATUS_SUCCESS);
 125 }
 126
 127 NTSTATUS STDCALL
 128 Ext2FileSystemControl(PDEVICE_OBJECT DeviceObject, PIRP Irp)
 129 {
 130    PIO_STACK_LOCATION Stack = IoGetCurrentIrpStackLocation(Irp);
 131    PVPB vpb = Stack->Parameters.Mount.Vpb;
 132    PDEVICE_OBJECT DeviceToMount = Stack->Parameters.Mount.DeviceObject;
 133    NTSTATUS Status;
 134
 135    Status = Ext2Mount(DeviceToMount);
 136
 137    Irp->IoStatus.Status = Status;
 138    Irp->IoStatus.Information = 0;
 139
 140    IoCompleteRequest(Irp, IO_NO_INCREMENT);
 141    return(Status);
 142 }
 143
 144 NTSTATUS STDCALL
 145 DriverEntry(PDRIVER_OBJECT _DriverObject,
 146             PUNICODE_STRING RegistryPath)
 147 /*
 148  * FUNCTION: Called by the system to initalize the driver
 149  * ARGUMENTS:
 150  *           DriverObject = object describing this driver
 151  *           RegistryPath = path to our configuration entries
 152  * RETURNS: Success or failure
 153  */
 154 {
 155    PDEVICE_OBJECT DeviceObject;
 156    NTSTATUS ret;
 157    UNICODE_STRING DeviceName = UNICODE_STRING_INITIALIZER(L"\\Device\\Ext2Fsd");
 158
 159    DbgPrint("Ext2 FSD 0.0.1\n");
 160
 161    DriverObject = _DriverObject;
 162
 163    ret = IoCreateDevice(DriverObject,
 164                         0,
 165                         &DeviceName,
 166                         FILE_DEVICE_FILE_SYSTEM,
 167                         0,
 168                         FALSE,
 169                         &DeviceObject);
 170    if (ret!=STATUS_SUCCESS)
 171      {
 172         return(ret);
 173      }
 174
 175    DeviceObject->Flags=0;
 176    DriverObject->MajorFunction[IRP_MJ_CLOSE] = Ext2Close;
 177    DriverObject->MajorFunction[IRP_MJ_CREATE] = Ext2Create;
 178    DriverObject->MajorFunction[IRP_MJ_READ] = Ext2Read;
 179    DriverObject->MajorFunction[IRP_MJ_WRITE] = Ext2Write;
 180    DriverObject->MajorFunction[IRP_MJ_FILE_SYSTEM_CONTROL] =
 181                       Ext2FileSystemControl;
 182    DriverObject->MajorFunction[IRP_MJ_DIRECTORY_CONTROL] =
 183                       Ext2DirectoryControl;
 184    DriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION] =
 185                       Ext2QueryInformation;
 186    DriverObject->MajorFunction[IRP_MJ_SET_INFORMATION] = Ext2SetInformation;
 187    DriverObject->MajorFunction[IRP_MJ_FLUSH_BUFFERS] = Ext2FlushBuffers;
 188    DriverObject->MajorFunction[IRP_MJ_SHUTDOWN] = Ext2Shutdown;
 189    DriverObject->MajorFunction[IRP_MJ_CLEANUP] = Ext2Cleanup;
 190    DriverObject->MajorFunction[IRP_MJ_QUERY_SECURITY] = Ext2QuerySecurity;
 191    DriverObject->MajorFunction[IRP_MJ_SET_SECURITY] = Ext2SetSecurity;
 192    DriverObject->MajorFunction[IRP_MJ_QUERY_QUOTA] = Ext2QueryQuota;
 193    DriverObject->MajorFunction[IRP_MJ_SET_QUOTA] = Ext2SetQuota;
 194
 195    DriverObject->DriverUnload = NULL;
 196
 197    IoRegisterFileSystem(DeviceObject);
 198
 199    return(STATUS_SUCCESS);
 200 }
 201