[fastfat_new]

[reactos.git] / reactos / drivers / filesystems / fastfat_new / rw.c

diff --git a/reactos/drivers/filesystems/fastfat_new/rw.c b/reactos/drivers/filesystems/fastfat_new/rw.c
index 53bc940..d3693d8 100644 (file)
--- a/reactos/drivers/filesystems/fastfat_new/rw.c
+++ b/reactos/drivers/filesystems/fastfat_new/rw.c
@@ -4,6 +4,7 @@
  * FILE:            drivers/filesystems/fastfat/rw.c
  * PURPOSE:         Read/write support
  * PROGRAMMERS:     Aleksey Bragin (aleksey@reactos.org)
+ *                  Alexey Vlasov
  */
 
 /* INCLUDES *****************************************************************/
@@ -14,14 +15,83 @@
 /* FUNCTIONS *****************************************************************/
 
 NTSTATUS
-VfatRead(PFAT_IRP_CONTEXT IrpContext)
+NTAPI
+FatiRead(PFAT_IRP_CONTEXT IrpContext)
 {
+    ULONG NumberOfBytes;
+    LARGE_INTEGER ByteOffset;
+    PFILE_OBJECT FileObject;
+    TYPE_OF_OPEN OpenType;
+    PIO_STACK_LOCATION IrpSp = IrpContext->Stack;
+    PFCB Fcb;
+    PVCB Vcb;
+    PCCB Ccb;
+
+    FileObject = IrpSp->FileObject;
+    NumberOfBytes = IrpSp->Parameters.Read.Length;
+    ByteOffset = IrpSp->Parameters.Read.ByteOffset;
+    if (NumberOfBytes == 0)
+    {
+        FatCompleteRequest(IrpContext, IrpContext->Irp, STATUS_SUCCESS);
+        return STATUS_SUCCESS;
+    }
+    
+    OpenType = FatDecodeFileObject(FileObject, &Vcb, &Fcb, &Ccb);
+
+    DPRINT1("FatiRead() Fcb %p, Name %wZ, Offset %d, Length %d, Handle %p\n",
+        Fcb, &FileObject->FileName, ByteOffset.LowPart, NumberOfBytes, Fcb->FatHandle);
     return STATUS_NOT_IMPLEMENTED;
 }
 
 NTSTATUS
-VfatWrite(PFAT_IRP_CONTEXT IrpContext)
+NTAPI
+FatRead(PDEVICE_OBJECT DeviceObject, PIRP Irp)
+{
+    NTSTATUS Status;
+    BOOLEAN TopLevel, CanWait;
+    PFAT_IRP_CONTEXT IrpContext;
+
+    CanWait = TRUE;
+    TopLevel = FALSE;
+    Status = STATUS_INVALID_DEVICE_REQUEST;
+    /* Get CanWait flag */
+    if (IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL)
+        CanWait = IoIsOperationSynchronous(Irp);
+
+    /* Enter FsRtl critical region */
+    FsRtlEnterFileSystem();
+
+    if (DeviceObject != FatGlobalData.DiskDeviceObject)
+    {
+        /* Set Top Level IRP if not set */
+        if (IoGetTopLevelIrp() == NULL)
+        {
+            IoSetTopLevelIrp(Irp);
+            TopLevel = TRUE;
+        }
+
+        /* Build an irp context */
+        IrpContext = FatBuildIrpContext(Irp, CanWait);
+
+        /* Perform the actual read */
+        Status = FatiRead(IrpContext);
+
+        /* Restore top level Irp */
+        if (TopLevel)
+            IoSetTopLevelIrp(NULL);
+    }
+    /* Leave FsRtl critical region */
+    FsRtlExitFileSystem();
+
+    DPRINT1("FatRead()\n");
+    return Status;
+}
+
+NTSTATUS
+NTAPI
+FatWrite(PDEVICE_OBJECT DeviceObject, PIRP Irp)
 {
+    DPRINT1("FatWrite()\n");
     return STATUS_NOT_IMPLEMENTED;
 }