1 files changed, 177 insertions, 0 deletions

diff --git a/private/ntos/mup/filobsup.c b/private/ntos/mup/filobsup.c
new file mode 100644
index 000000000..9e4de74a1
--- /dev/null
+++ b/private/ntos/mup/filobsup.c
@@ -0,0 +1,177 @@
+/*++
+
+Copyright (c) 1989  Microsoft Corporation
+
+Module Name:
+
+    filobsup.c
+
+Abstract:
+
+    This module implements the mup file object support routines.
+
+Author:
+
+    Manny Weiser (mannyw)    20-Dec-1991
+
+Revision History:
+
+--*/
+
+#include "mup.h"
+
+//
+// The debug trace level
+//
+
+#define Dbg                              (DEBUG_TRACE_FILOBSUP)
+
+#ifdef ALLOC_PRAGMA
+#pragma alloc_text( PAGE, MupDecodeFileObject )
+#pragma alloc_text( PAGE, MupSetFileObject )
+#endif
+
+VOID
+MupSetFileObject (
+    IN PFILE_OBJECT FileObject OPTIONAL,
+    IN PVOID FsContext,
+    IN PVOID FsContext2
+    )
+
+/*++
+
+Routine Description:
+
+    This routine sets the file system pointers within the file object.
+    This routine MUST be called with the Global Lock held.
+
+Arguments:
+
+    FileObject - Supplies a pointer to the file object being modified, and
+        can optionally be null.
+
+    FsContext - Supplies a pointer to the vcb.
+        structure.
+
+    FsContext2 - NULL
+
+Return Value:
+
+    None.
+
+--*/
+
+{
+    PAGED_CODE();
+    DebugTrace(+1, Dbg, "MupSetFileObject, FileObject = %08lx\n", (ULONG)FileObject );
+
+    //
+    // Set the fscontext fields of the file object.
+    //
+
+    FileObject->FsContext  = FsContext;
+    FileObject->FsContext2 = FsContext2;
+
+    DebugTrace(-1, Dbg, "MupSetFileObject -> VOID\n", 0);
+
+    return;
+}
+
+
+BLOCK_TYPE
+MupDecodeFileObject (
+    IN PFILE_OBJECT FileObject,
+    OUT PVOID *FsContext,
+    OUT PVOID *FsContext2
+    )
+
+/*++
+
+Routine Description:
+
+    This procedure takes a pointer to a file object, that has already been
+    opened by the MUP and figures out what it really is opened.
+
+Arguments:
+
+    FileObject - Supplies the file object pointer being interrogated
+
+    FsContext - Receive the file object FsContext pointer
+
+    FsContext2 - Receive the file object FsContext2 pointer
+
+
+Return Value:
+
+    BlockType - Returns the node type code for a Vcb or Fcb.
+
+        Vcb - indicates that file object opens the mup driver.
+
+        Ccb - indicates that the file object is for a broadcast mailslot file.
+
+        Zero - indicates that the file object has been closed.
+
+--*/
+
+{
+    BLOCK_TYPE blockType;
+
+    PAGED_CODE();
+    DebugTrace(+1, Dbg, "MupDecodeFileObject, FileObject = %08lx\n", (ULONG)FileObject);
+
+    //
+    // Acquire the global lock to protect the block reference counts.
+    //
+
+    MupAcquireGlobalLock();
+
+    //
+    // Read the fs FsContext fields of the file object, then reference
+    // the block pointed at by the file object
+    //
+
+    *FsContext = FileObject->FsContext;
+    *FsContext2 = FileObject->FsContext2;
+
+    ASSERT( (*FsContext) != NULL );
+
+    if ( ((*FsContext) == NULL) ||
+            ((PBLOCK_HEADER)(*FsContext))->BlockState != BlockStateActive ) {
+
+        //
+        // This Block is shutting down.  Indicate this to the caller.
+        //
+
+        blockType = BlockTypeUndefined;
+
+    } else if ( *FsContext != NULL ) {
+
+        //
+        // The node is active.  Supply a referenced pointer to the node.
+        //
+
+        blockType = BlockType( *FsContext );
+        MupReferenceBlock( *FsContext );
+
+    }
+
+    //
+    // Release the global lock and return to the caller.
+    //
+
+    MupReleaseGlobalLock();
+
+    DebugTrace(0,
+               DEBUG_TRACE_REFCOUNT,
+               "Referencing block %08lx\n",
+               (ULONG)*FsContext);
+    DebugTrace(0,
+               DEBUG_TRACE_REFCOUNT,
+               "    Reference count = %lx\n",
+               ((PBLOCK_HEADER)(*FsContext))->ReferenceCount );
+
+    DebugTrace(-1, Dbg, "MupDecodeFileObject -> %08lx\n", blockType);
+
+    return blockType;
+}
+