From 0f375710aa488428e1b5f43e6fcd29c6041222b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Herm=C3=A8s=20B=C3=A9lusca-Ma=C3=AFto?=
 <hermes.belusca-maito@reactos.org>
Date: Fri, 23 Aug 2013 21:18:46 +0000
Subject: [PATCH] [NTOSKRNL] We aim at being compatible with Windows Server
 2003... Do it better! Use the \GLOBAL?? dos-devices object directory instead
 of \??, as used in Windows NT and 2000 (which becomes per-session in Windows
 >= XP), but add a temporary hack (i.e. create a symbolic link \?? <--->
 \GLOBAL??) since we don't support yet Ob device mappings which are needed for
 this mapping, in particular. As a side-effect, fix starting of DeviceTree
 v2.30 on ReactOS. Now it works correctly, as on Win2k3 :)

CORE-6572 #resolve #comment Finally fix loading of the objinfo driver, which failed at creating a symbolic link in \GLOBAL??\ for its device.

svn path=/trunk/; revision=59803
---
 reactos/ntoskrnl/ob/obname.c | 110 ++++++++++++++++++++++-------------
 1 file changed, 71 insertions(+), 39 deletions(-)

diff --git a/reactos/ntoskrnl/ob/obname.c b/reactos/ntoskrnl/ob/obname.c
index 38e0574c50e..0744da0cb7f 100644
--- a/reactos/ntoskrnl/ob/obname.c
+++ b/reactos/ntoskrnl/ob/obname.c
@@ -37,56 +37,27 @@ INIT_FUNCTION
 ObpCreateDosDevicesDirectory(VOID)
 {
     OBJECT_ATTRIBUTES ObjectAttributes;
-    UNICODE_STRING Name, LinkName;
+    UNICODE_STRING RootName, TargetName, LinkName;
     HANDLE Handle, SymHandle;
     NTSTATUS Status;
 
-    /* Create the '\??' directory */
-    RtlInitUnicodeString(&Name, L"\\??");
+    /* Create the global DosDevices directory \?? */
+    RtlInitUnicodeString(&RootName, L"\\GLOBAL??");
     InitializeObjectAttributes(&ObjectAttributes,
-                               &Name,
+                               &RootName,
                                OBJ_PERMANENT,
                                NULL,
                                NULL);
     Status = NtCreateDirectoryObject(&Handle,
                                      DIRECTORY_ALL_ACCESS,
                                      &ObjectAttributes);
-    if (!NT_SUCCESS(Status)) return FALSE;
-
-    /* Initialize the GLOBALROOT path */
-    RtlInitUnicodeString(&LinkName, L"GLOBALROOT");
-    RtlInitUnicodeString(&Name, L"");
-    InitializeObjectAttributes(&ObjectAttributes,
-                               &LinkName,
-                               OBJ_PERMANENT,
-                               Handle,
-                               NULL);
-    Status = NtCreateSymbolicLinkObject(&SymHandle,
-                                        SYMBOLIC_LINK_ALL_ACCESS,
-                                        &ObjectAttributes,
-                                        &Name);
-    if (NT_SUCCESS(Status)) NtClose(SymHandle);
-
-    /* Link \??\Global to \?? */
-    RtlInitUnicodeString(&LinkName, L"Global");
-    RtlInitUnicodeString(&Name, L"\\??");
-    InitializeObjectAttributes(&ObjectAttributes,
-                               &LinkName,
-                               OBJ_PERMANENT,
-                               Handle,
-                               NULL);
-    Status = NtCreateSymbolicLinkObject(&SymHandle,
-                                        SYMBOLIC_LINK_ALL_ACCESS,
-                                        &ObjectAttributes,
-                                        &Name);
-    if (NT_SUCCESS(Status)) NtClose(SymHandle);
-
-    /* Close the directory handle */
-    NtClose(Handle);
     if (!NT_SUCCESS(Status)) return Status;
 
-    /* Create link from '\DosDevices' to '\??' directory */
-    RtlCreateUnicodeString(&LinkName, L"\\DosDevices");
+    /*********************************************\
+    |*** HACK until we support device mappings ***|
+    |*** Add a symlink \??\ <--> \GLOBAL??\    ***|
+    \*********************************************/
+    RtlInitUnicodeString(&LinkName, L"\\??");
     InitializeObjectAttributes(&ObjectAttributes,
                                &LinkName,
                                OBJ_PERMANENT,
@@ -95,7 +66,68 @@ ObpCreateDosDevicesDirectory(VOID)
     Status = NtCreateSymbolicLinkObject(&SymHandle,
                                         SYMBOLIC_LINK_ALL_ACCESS,
                                         &ObjectAttributes,
-                                        &Name);
+                                        &RootName);
+    if (NT_SUCCESS(Status)) NtClose(SymHandle);
+    /*********************************************\
+    \*********************************************/
+
+    // FIXME: Create a device mapping for the global \?? directory
+
+    /*
+     * Initialize the \??\GLOBALROOT symbolic link
+     * pointing to the root directory \ .
+     */
+    RtlInitUnicodeString(&LinkName, L"GLOBALROOT");
+    RtlInitUnicodeString(&TargetName, L"");
+    InitializeObjectAttributes(&ObjectAttributes,
+                               &LinkName,
+                               OBJ_PERMANENT,
+                               Handle,
+                               NULL);
+    Status = NtCreateSymbolicLinkObject(&SymHandle,
+                                        SYMBOLIC_LINK_ALL_ACCESS,
+                                        &ObjectAttributes,
+                                        &TargetName);
+    if (NT_SUCCESS(Status)) NtClose(SymHandle);
+
+    /*
+     * Initialize the \??\Global symbolic link pointing to the global
+     * DosDevices directory \?? . It is used to access the global \??
+     * by user-mode components which, by default, use a per-session
+     * DosDevices directory.
+     */
+    RtlInitUnicodeString(&LinkName, L"Global");
+    InitializeObjectAttributes(&ObjectAttributes,
+                               &LinkName,
+                               OBJ_PERMANENT,
+                               Handle,
+                               NULL);
+    Status = NtCreateSymbolicLinkObject(&SymHandle,
+                                        SYMBOLIC_LINK_ALL_ACCESS,
+                                        &ObjectAttributes,
+                                        &RootName);
+    if (NT_SUCCESS(Status)) NtClose(SymHandle);
+
+    /* Close the directory handle */
+    NtClose(Handle);
+    if (!NT_SUCCESS(Status)) return Status;
+
+    /*
+     * Initialize the \DosDevices symbolic link pointing to the global
+     * DosDevices directory \?? , for backward compatibility with
+     * Windows NT-2000 systems.
+     */
+    RtlCreateUnicodeString(&LinkName, L"\\DosDevices");
+    RtlInitUnicodeString(&RootName, (PCWSTR)&ObpDosDevicesShortNameRoot);
+    InitializeObjectAttributes(&ObjectAttributes,
+                               &LinkName,
+                               OBJ_PERMANENT,
+                               NULL,
+                               NULL);
+    Status = NtCreateSymbolicLinkObject(&SymHandle,
+                                        SYMBOLIC_LINK_ALL_ACCESS,
+                                        &ObjectAttributes,
+                                        &RootName);
     if (NT_SUCCESS(Status)) NtClose(SymHandle);
 
     /* FIXME: Hack Hack! */