[fireball] 39029: Alex Vlasov - Implement FatRead as a wrapper around internal helper FatiRead. - Stubplement FatiRead.

Author: fireball
Date: Fri Jan 23 03:41:30 2009
New Revision: 39029

URL: http://svn.reactos.org/svn/reactos?rev=39029&view=rev
Log:
Alex Vlasov
- Implement FatRead as a wrapper around internal helper FatiRead.
- Stubplement FatiRead.

Modified:
    trunk/reactos/drivers/filesystems/fastfat_new/rw.c

Modified: trunk/reactos/drivers/filesystems/fastfat_new/rw.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfat...
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat_new/rw.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat_new/rw.c [iso-8859-1] Fri Jan 23 03:41:30 2009
@@ -4,6 +4,7 @@
  * FILE:            drivers/filesystems/fastfat/rw.c
  * PURPOSE:         Read/write support
  * PROGRAMMERS:     Aleksey Bragin ([e-mail])
+ *                  Alexey Vlasov
  */

/* INCLUDES *****************************************************************/
@@ -15,10 +16,66 @@

NTSTATUS
 NTAPI
+FatiRead(PFAT_IRP_CONTEXT IrpContext)
+{
+    CSHORT FcbType;
+    ULONG NumberOfBytes;
+
+    FcbType = *((PCSHORT) IrpContext->FileObject->FsContext);
+    NumberOfBytes = IrpContext->Stack->Parameters.Read.Length;
+    if (NumberOfBytes == 0)
+    {
+        FatCompleteRequest(IrpContext, IrpContext->Irp, STATUS_SUCCESS);
+        return STATUS_SUCCESS;
+    }
+    //if (FcbType == FAT_NTC_VCB)
+
+    DPRINT1("FatiRead()\n");
+    return STATUS_NOT_IMPLEMENTED;
+}
+
+NTSTATUS
+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_NOT_IMPLEMENTED;
+    return Status;
 }

NTSTATUS