[pschweitzer] 71145: [NTOSKRNL] In FsRtlAddBaseMcbEntry(), try to detect incompatible LBNs before altering mappings. This fixes a few tests failures CORE-11002

Author: pschweitzer
Date: Mon Apr 11 20:29:35 2016
New Revision: 71145
URL: http://svn.reactos.org/svn/reactos?rev=71145&view=rev
Log:
[NTOSKRNL]
In FsRtlAddBaseMcbEntry(), try to detect incompatible LBNs before altering mappings.
This fixes a few tests failures
CORE-11002
Modified:
    trunk/reactos/ntoskrnl/fsrtl/largemcb.c
Modified: trunk/reactos/ntoskrnl/fsrtl/largemcb.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/fsrtl/largemcb.c?…
==============================================================================
--- trunk/reactos/ntoskrnl/fsrtl/largemcb.c     [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/fsrtl/largemcb.c     [iso-8859-1] Mon Apr 11 20:29:35 2016
@@ -135,10 +135,12 @@
                      IN LONGLONG SectorCount)
 {
     BOOLEAN Result = TRUE;
+    BOOLEAN IntResult;
     PBASE_MCB_INTERNAL Mcb = (PBASE_MCB_INTERNAL)OpaqueMcb;
     LARGE_MCB_MAPPING_ENTRY Node, NeedleRun;
     PLARGE_MCB_MAPPING_ENTRY LowerRun, HigherRun;
     BOOLEAN NewElement;
+    LONGLONG IntLbn;
     DPRINT("FsRtlAddBaseMcbEntry(%p, %I64d, %I64d, %I64d)\n", OpaqueMcb, Vbn,
Lbn, SectorCount);
@@ -152,6 +154,16 @@
     {
         Result = FALSE;
         goto quit;
+    }
+
+    IntResult = FsRtlLookupBaseMcbEntry(OpaqueMcb, Vbn, &IntLbn, NULL, NULL, NULL,
NULL);
+    if (IntResult)
+    {
+        if (IntLbn != -1 && IntLbn != Lbn)
+        {
+            Result = FALSE;
+            goto quit;
+        }
     }
     /* clean any possible previous entries in our range */