04/05: [NTOSKRNL] Implement support for PIN_IF_BCB flag

[Pierre Schweitzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=bd39459f89da7e5031b2b…

commit bd39459f89da7e5031b2b30266521df362759e52
Author:     Pierre Schweitzer <pierre(a)reactos.org>
AuthorDate: Fri Oct 5 21:17:38 2018 +0200
Commit:     Pierre Schweitzer <pierre(a)reactos.org>
CommitDate: Fri Oct 5 21:26:16 2018 +0200

    [NTOSKRNL] Implement support for PIN_IF_BCB flag
---
 ntoskrnl/cc/pin.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ntoskrnl/cc/pin.c b/ntoskrnl/cc/pin.c
index f40405e6c5..3e89cacddf 100644
--- a/ntoskrnl/cc/pin.c
+++ b/ntoskrnl/cc/pin.c
@@ -329,6 +329,12 @@ CcPinRead (
 
     if (iBcb == NULL)
     {
+        /* We failed to find an already existing BCB */
+        if (BooleanFlagOn(Flags, PIN_IF_BCB))
+        {
+            return FALSE;
+        }
+
         /* Map first */
         if (!CcpMapData(SharedCacheMap, FileOffset, Length, Flags, Bcb, Buffer))
         {