[tfaber] 75453: [0.4.6] - Merge NFS symbolic link fix (r75451) by Pierre CORE-13615

Author: tfaber
Date: Sun Jul 30 12:40:24 2017
New Revision: 75453

URL: http://svn.reactos.org/svn/reactos?rev=75453&view=rev
Log:
[0.4.6]
- Merge NFS symbolic link fix (r75451) by Pierre
CORE-13615

Modified:
    branches/ros-branch-0_4_6/   (props changed)
    branches/ros-branch-0_4_6/reactos/   (props changed)
    branches/ros-branch-0_4_6/reactos/sdk/lib/drivers/rdbsslib/rdbss.c

Propchange: branches/ros-branch-0_4_6/
------------------------------------------------------------------------------
--- svn:mergeinfo	(original)
+++ svn:mergeinfo	Sun Jul 30 12:40:24 2017
@@ -1 +1,2 @@
 /branches/colins-printing-for-freedom:67543-68405,68407-68414,68417-70595
+/trunk:75451

Propchange: branches/ros-branch-0_4_6/reactos/
------------------------------------------------------------------------------
--- svn:mergeinfo	(original)
+++ svn:mergeinfo	Sun Jul 30 12:40:24 2017
@@ -23,3 +23,4 @@
 /branches/usb-bringup:51335,51337,51341-51343,51348,51350,51353,51355,51365-51369,51372,51384-54388,54396-54398,54736-54737,54752-54754,54756-54760,54762,54764-54765,54767-54768,54772,54774-54777,54781,54787,54790-54792,54797-54798,54806,54808,54834-54838,54843,54850,54852,54856,54858-54859
 /branches/usb-bringup-trunk:55019-55543,55548-55554,55556-55567
 /branches/wlan-bringup:54809-54998
+/trunk/reactos:75451

Modified: branches/ros-branch-0_4_6/reactos/sdk/lib/drivers/rdbsslib/rdbss.c
URL: http://svn.reactos.org/svn/reactos/branches/ros-branch-0_4_6/reactos/sdk/lib...
==============================================================================
--- branches/ros-branch-0_4_6/reactos/sdk/lib/drivers/rdbsslib/rdbss.c	[iso-8859-1] (original)
+++ branches/ros-branch-0_4_6/reactos/sdk/lib/drivers/rdbsslib/rdbss.c	[iso-8859-1] Sun Jul 30 12:40:24 2017
@@ -7492,6 +7492,9 @@
     return Status;
 }

+/*
+ * @implemented
+ */
 NTSTATUS
 NTAPI
 RxPrepareToReparseSymbolicLink(
@@ -7501,8 +7504,74 @@
     BOOLEAN NewPathIsAbsolute,
     PBOOLEAN ReparseRequired)
 {
-    UNIMPLEMENTED;
-    return STATUS_NOT_IMPLEMENTED;
+    PWSTR NewBuffer;
+    USHORT NewLength;
+    PFILE_OBJECT FileObject;
+
+    /* Assume no reparse is required first */
+    *ReparseRequired = FALSE;
+
+    /* Only supported for IRP_MJ_CREATE */
+    if (RxContext->MajorFunction != IRP_MJ_CREATE)
+    {
+        return STATUS_INVALID_PARAMETER;
+    }
+
+    /* If symbolic link is not embedded, and DELETE is specified, fail */
+    if (!SymbolicLinkEmbeddedInOldPath)
+    {
+        /* Excepted if DELETE is the only flag specified, then, open has to succeed
+         * See: https://msdn.microsoft.com/en-us/library/windows/hardware/ff554649(v=vs.85).... (remarks)
+         */
+        if (BooleanFlagOn(RxContext->Create.NtCreateParameters.DesiredAccess, DELETE) &&
+            BooleanFlagOn(RxContext->Create.NtCreateParameters.DesiredAccess, ~DELETE))
+        {
+            return STATUS_ACCESS_DENIED;
+        }
+    }
+
+    /* At that point, assume reparse will be required */
+    *ReparseRequired = TRUE;
+
+    /* If new path isn't absolute, it's up to us to make it absolute */
+    if (!NewPathIsAbsolute)
+    {
+        /* The prefix will be \Device\Mup */
+        NewLength = NewPath->Length + (sizeof(L"\Device\Mup") - sizeof(UNICODE_NULL));
+        NewBuffer = ExAllocatePoolWithTag(PagedPool | POOL_COLD_ALLOCATION, NewLength,
+                                          RX_MISC_POOLTAG);
+        if (NewBuffer == NULL)
+        {
+            return STATUS_INSUFFICIENT_RESOURCES;
+        }
+
+        /* Copy data for the new path */
+        RtlMoveMemory(NewBuffer, L"\Device\Mup", (sizeof(L"\Device\Mup") - sizeof(UNICODE_NULL)));
+        RtlMoveMemory(Add2Ptr(NewBuffer, (sizeof(L"\Device\Mup") - sizeof(UNICODE_NULL))),
+                      NewPath->Buffer, NewPath->Length);
+    }
+    /* Otherwise, use caller path as it */
+    else
+    {
+        NewLength = NewPath->Length;
+        NewBuffer = NewPath->Buffer;
+    }
+
+    /* Get the FILE_OBJECT we'll modify */
+    FileObject = RxContext->CurrentIrpSp->FileObject;
+
+    /* Free old path first */
+    ExFreePoolWithTag(FileObject->FileName.Buffer, 0);
+    /* And setup new one */
+    FileObject->FileName.Length = NewLength;
+    FileObject->FileName.MaximumLength = NewLength;
+    FileObject->FileName.Buffer = NewBuffer;
+
+    /* And set reparse flag */
+    SetFlag(RxContext->Create.Flags, RX_CONTEXT_CREATE_FLAG_REPARSE);
+
+    /* Done! */
+    return STATUS_SUCCESS;
 }

/*