01/02: [NTOSKRNL] Implement IoGetFileObjectFilterContext()

[Pierre Schweitzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=a43fb5e054b51a59a6cb5…

commit a43fb5e054b51a59a6cb5f0cd81d6535460d08b4
Author:     Pierre Schweitzer <pierre(a)reactos.org>
AuthorDate: Thu Oct 4 19:19:24 2018 +0200
Commit:     Pierre Schweitzer <pierre(a)reactos.org>
CommitDate: Thu Oct 4 19:30:38 2018 +0200

    [NTOSKRNL] Implement IoGetFileObjectFilterContext()
---
 ntoskrnl/include/internal/io.h | 1 +
 ntoskrnl/io/iomgr/file.c       | 7 ++++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/ntoskrnl/include/internal/io.h b/ntoskrnl/include/internal/io.h
index 9928cbaab4..8f0398b4ad 100644
--- a/ntoskrnl/include/internal/io.h
+++ b/ntoskrnl/include/internal/io.h
@@ -96,6 +96,7 @@
 typedef struct _FILE_OBJECT_EXTENSION
 {
     PDEVICE_OBJECT TopDeviceObjectHint;
+    PVOID FilterContext;
 
 } FILE_OBJECT_EXTENSION, *PFILE_OBJECT_EXTENSION;
 
diff --git a/ntoskrnl/io/iomgr/file.c b/ntoskrnl/io/iomgr/file.c
index 68a801fd4f..0a5e0b1d1a 100644
--- a/ntoskrnl/io/iomgr/file.c
+++ b/ntoskrnl/io/iomgr/file.c
@@ -2443,9 +2443,10 @@ IoGetFileObjectFilterContext(IN PFILE_OBJECT FileObject)
 {
     if (FileObject->Flags & FO_FILE_OBJECT_HAS_EXTENSION)
     {
-        UNIMPLEMENTED;
-        /* FIXME: return NULL for the moment ~ */
-        return NULL;
+        PFILE_OBJECT_EXTENSION FileObjectExtension;
+
+        FileObjectExtension = FileObject->FileObjectExtension;
+        return FileObjectExtension->FilterContext;
     }
 
     return NULL;