Added experimental support for FAT and NTFS FSDs.

[reactos.git] / reactos / drivers / fs / fs_rec / fat.c

diff --git a/reactos/drivers/fs/fs_rec/fat.c b/reactos/drivers/fs/fs_rec/fat.c
index 2c93ac6..7989cb6 100644 (file)
--- a/reactos/drivers/fs/fs_rec/fat.c
+++ b/reactos/drivers/fs/fs_rec/fat.c
@@ -16,7 +16,7 @@
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
-/* $Id: fat.c,v 1.1 2002/05/15 09:40:47 ekohl Exp $
+/* $Id: fat.c,v 1.2 2002/05/15 18:02:59 ekohl Exp $
  *
  * COPYRIGHT:        See COPYING in the top level directory
  * PROJECT:          ReactOS kernel
@@ -29,7 +29,7 @@
 
 #include <ddk/ntddk.h>
 
-//#define NDEBUG
+#define NDEBUG
 #include <debug.h>
 
 #include "fs_rec.h"
@@ -37,6 +37,61 @@
 
 /* FUNCTIONS ****************************************************************/
 
+static NTSTATUS
+FsRecIsFatVolume(IN PDEVICE_OBJECT DeviceObject)
+{
+  DISK_GEOMETRY DiskGeometry;
+  PUCHAR Buffer;
+  ULONG Size;
+  NTSTATUS Status;
+
+  Size = sizeof(DISK_GEOMETRY);
+  Status = FsRecDeviceIoControl(DeviceObject,
+                               IOCTL_DISK_GET_DRIVE_GEOMETRY,
+                               NULL,
+                               0,
+                               &DiskGeometry,
+                               &Size);
+  DPRINT("FsRecDeviceIoControl() Status %lx\n", Status);
+  if (!NT_SUCCESS(Status))
+    {
+      return(Status);
+    }
+
+  DPRINT("BytesPerSector: %lu\n", DiskGeometry.BytesPerSector);
+  Buffer = ExAllocatePool(NonPagedPool,
+                         DiskGeometry.BytesPerSector);
+  if (Buffer == NULL)
+    {
+      return(STATUS_INSUFFICIENT_RESOURCES);
+    }
+
+  Status = FsRecReadSectors(DeviceObject,
+                           0, /* Partition boot sector */
+                           1,
+                           DiskGeometry.BytesPerSector,
+                           Buffer);
+  if (!NT_SUCCESS(Status))
+    {
+      return(Status);
+    }
+
+  if ((strncmp(&Buffer[0x36], "FAT12", 5) == 0) ||
+      (strncmp(&Buffer[0x36], "FAT16", 5) == 0) ||
+      (strncmp(&Buffer[0x52], "FAT32", 5) == 0))
+    {
+      Status = STATUS_SUCCESS;
+    }
+  else
+    {
+      Status = STATUS_UNRECOGNIZED_VOLUME;
+    }
+
+  ExFreePool(Buffer);
+
+  return(Status);
+}
+
 
 NTSTATUS
 FsRecVfatFsControl(IN PDEVICE_OBJECT DeviceObject,
@@ -51,24 +106,20 @@ FsRecVfatFsControl(IN PDEVICE_OBJECT DeviceObject,
   switch (Stack->MinorFunction)
     {
       case IRP_MN_MOUNT_VOLUME:
-       DPRINT("Fat: IRP_MN_MOUNT_VOLUME\n");
-       Status = STATUS_INVALID_DEVICE_REQUEST;
-#if 0
+       DPRINT("FAT: IRP_MN_MOUNT_VOLUME\n");
        Status = FsRecIsFatVolume(Stack->Parameters.MountVolume.DeviceObject);
        if (NT_SUCCESS(Status))
          {
            DPRINT("Identified FAT volume\n");
            Status = STATUS_FS_DRIVER_REQUIRED;
          }
-#endif
        break;
 
       case IRP_MN_LOAD_FILE_SYSTEM:
-       DPRINT("Fat: IRP_MN_LOAD_FILE_SYSTEM\n");
-       Status = STATUS_INVALID_DEVICE_REQUEST;
+       DPRINT("FAT: IRP_MN_LOAD_FILE_SYSTEM\n");
 #if 0
-#if 0
-       RtlInitUnicodeString(&RegistryPath, FSD_REGISTRY_PATH);
+       RtlInitUnicodeString(&RegistryPath,
+                            L"\\Registry\\Machine\\SYSTEM\\CurrentControlSet\\Services\\Vfatfs");
 #endif
        RtlInitUnicodeString(&RegistryPath,
                             L"\\SystemRoot\\system32\\drivers\\vfatfs.sys");
@@ -81,11 +132,10 @@ FsRecVfatFsControl(IN PDEVICE_OBJECT DeviceObject,
          {
            IoUnregisterFileSystem(DeviceObject);
          }
-#endif
        break;
 
       default:
-       DPRINT("Fat: Unknown minor function %lx\n", Stack->MinorFunction);
+       DPRINT("FAT: Unknown minor function %lx\n", Stack->MinorFunction);
        Status = STATUS_INVALID_DEVICE_REQUEST;
        break;
     }