reactos/drivers/filesystems/fastfat_new/rw.c

   1 /*
   2  * PROJECT:         ReactOS FAT file system driver
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            drivers/filesystems/fastfat/rw.c
   5  * PURPOSE:         Read/write support
   6  * PROGRAMMERS:     Aleksey Bragin (aleksey@reactos.org)
   7  *                  Alexey Vlasov
   8  */
   9
  10 /* INCLUDES *****************************************************************/
  11
  12 #define NDEBUG
  13 #include "fastfat.h"
  14
  15 /* FUNCTIONS *****************************************************************/
  16
  17 NTSTATUS
  18 NTAPI
  19 FatiRead(PFAT_IRP_CONTEXT IrpContext)
  20 {
  21     ULONG NumberOfBytes;
  22     LARGE_INTEGER ByteOffset;
  23     PFILE_OBJECT FileObject;
  24     TYPE_OF_OPEN OpenType;
  25     PIO_STACK_LOCATION IrpSp = IrpContext->Stack;
  26     PFCB Fcb;
  27     PVCB Vcb;
  28     PCCB Ccb;
  29
  30     FileObject = IrpSp->FileObject;
  31     NumberOfBytes = IrpSp->Parameters.Read.Length;
  32     ByteOffset = IrpSp->Parameters.Read.ByteOffset;
  33     if (NumberOfBytes == 0)
  34     {
  35         FatCompleteRequest(IrpContext, IrpContext->Irp, STATUS_SUCCESS);
  36         return STATUS_SUCCESS;
  37     }
  38
  39     OpenType = FatDecodeFileObject(FileObject, &Vcb, &Fcb, &Ccb);
  40
  41     DPRINT1("FatiRead() Fcb %p, Name %wZ, Offset %d, Length %d\n",
  42         Fcb, &FileObject->FileName, ByteOffset.LowPart, NumberOfBytes);
  43     return STATUS_NOT_IMPLEMENTED;
  44 }
  45
  46 NTSTATUS
  47 NTAPI
  48 FatRead(PDEVICE_OBJECT DeviceObject, PIRP Irp)
  49 {
  50     NTSTATUS Status;
  51     BOOLEAN TopLevel, CanWait;
  52     PFAT_IRP_CONTEXT IrpContext;
  53
  54     CanWait = TRUE;
  55     TopLevel = FALSE;
  56     Status = STATUS_INVALID_DEVICE_REQUEST;
  57     /* Get CanWait flag */
  58     if (IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL)
  59         CanWait = IoIsOperationSynchronous(Irp);
  60
  61     /* Enter FsRtl critical region */
  62     FsRtlEnterFileSystem();
  63
  64     if (DeviceObject != FatGlobalData.DiskDeviceObject)
  65     {
  66         /* Set Top Level IRP if not set */
  67         if (IoGetTopLevelIrp() == NULL)
  68         {
  69             IoSetTopLevelIrp(Irp);
  70             TopLevel = TRUE;
  71         }
  72
  73         /* Build an irp context */
  74         IrpContext = FatBuildIrpContext(Irp, CanWait);
  75
  76         /* Perform the actual read */
  77         Status = FatiRead(IrpContext);
  78
  79         /* Restore top level Irp */
  80         if (TopLevel)
  81             IoSetTopLevelIrp(NULL);
  82     }
  83     /* Leave FsRtl critical region */
  84     FsRtlExitFileSystem();
  85
  86     DPRINT1("FatRead()\n");
  87     return Status;
  88 }
  89
  90 NTSTATUS
  91 NTAPI
  92 FatWrite(PDEVICE_OBJECT DeviceObject, PIRP Irp)
  93 {
  94     DPRINT1("FatWrite()\n");
  95     return STATUS_NOT_IMPLEMENTED;
  96 }
  97
  98