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authorAdam <you@example.com>2020-05-17 05:51:50 +0200
committerAdam <you@example.com>2020-05-17 05:51:50 +0200
commite611b132f9b8abe35b362e5870b74bce94a1e58e (patch)
treea5781d2ec0e085eeca33cf350cf878f2efea6fe5 /private/nw/rdr/deviosup.c
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-rw-r--r--private/nw/rdr/deviosup.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/private/nw/rdr/deviosup.c b/private/nw/rdr/deviosup.c
new file mode 100644
index 000000000..1ff83c50f
--- /dev/null
+++ b/private/nw/rdr/deviosup.c
@@ -0,0 +1,153 @@
+/*++
+
+Copyright (c) 1989 Microsoft Corporation
+
+Module Name:
+
+ deviosup.c
+
+Abstract:
+
+ This module implements the memory locking routines for the netware
+ redirector.
+
+Author:
+
+ Manny Weiser (mannyw) 10-Mar-1993
+
+Revision History:
+
+--*/
+
+#include "procs.h"
+
+//
+// Local debug trace level
+//
+
+#define Dbg (DEBUG_TRACE_DEVIOSUP)
+
+#ifdef ALLOC_PRAGMA
+#pragma alloc_text( PAGE, NwMapUserBuffer )
+#pragma alloc_text( PAGE, NwLockUserBuffer )
+#endif
+
+
+VOID
+NwMapUserBuffer (
+ IN OUT PIRP Irp,
+ IN KPROCESSOR_MODE AccessMode,
+ OUT PVOID *UserBuffer
+ )
+
+/*++
+
+Routine Description:
+
+ This routine obtains a usable virtual address for the user buffer
+ for the current I/O request in the specified mode.
+
+Arguments:
+
+ Irp - Pointer to the Irp for the request.
+
+ AccessMode - UserMode or KernelMode.
+
+ UserBuffer - Returns pointer to mapped user buffer.
+
+Return Value:
+
+ None.
+
+--*/
+
+{
+ PAGED_CODE();
+
+ AccessMode;
+
+ //
+ // If there is no Mdl, then we must be in the Fsd, and we can simply
+ // return the UserBuffer field from the Irp.
+ //
+
+ if (Irp->MdlAddress == NULL) {
+
+ *UserBuffer = Irp->UserBuffer;
+ return;
+ }
+
+ //
+ // Get a system virtual address for the buffer.
+ //
+
+ *UserBuffer = MmGetSystemAddressForMdl( Irp->MdlAddress );
+ return;
+}
+
+
+VOID
+NwLockUserBuffer (
+ IN OUT PIRP Irp,
+ IN LOCK_OPERATION Operation,
+ IN ULONG BufferLength
+ )
+
+/*++
+
+Routine Description:
+
+ This routine locks the specified buffer for the specified type of
+ access. The file system requires this routine since it does not
+ ask the I/O system to lock its buffers for direct I/O. This routine
+ may only be called from the FSD while still in the user context.
+
+Arguments:
+
+ Irp - Pointer to the IRP for which the buffer is to be locked.
+
+ Operation - IoWriteAccess for read operations, or IoReadAccess for
+ write operations.
+
+ BufferLength - Length of user buffer.
+
+Return Value:
+
+ None
+
+--*/
+
+{
+ PMDL mdl;
+
+ PAGED_CODE();
+
+ if (Irp->MdlAddress == NULL) {
+
+ //
+ // This read is bound for the current process. Perform the
+ // same functions as above, only do not switch processes.
+ //
+
+ mdl = IoAllocateMdl( Irp->UserBuffer, BufferLength, FALSE, TRUE, Irp );
+
+ if (mdl == NULL) {
+
+ ExRaiseStatus( STATUS_INSUFFICIENT_RESOURCES );
+ }
+
+ try {
+
+ MmProbeAndLockPages( mdl,
+ Irp->RequestorMode,
+ Operation );
+
+ } except(EXCEPTION_EXECUTE_HANDLER) {
+
+ IoFreeMdl( mdl );
+ Irp->MdlAddress = NULL;
+ ExRaiseStatus( FsRtlNormalizeNtstatus( GetExceptionCode(),
+ STATUS_INVALID_USER_BUFFER ));
+ }
+ }
+}