From f5a65b599245b818370c582f506fac10f79cbe63 Mon Sep 17 00:00:00 2001
From: Bart Oldeman <bart@dosemu.org>
Date: Thu, 28 Aug 2003 20:55:34 +0000
Subject: [PATCH] int21/ax=440d lock/unlock logical/physical volume simulate
 success for MS-DOS 7+ SCANDISK etc. --LG

git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@662 6ac86273-5f31-0410-b378-82cca8765d1b
---
 kernel/ioctl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/ioctl.c b/kernel/ioctl.c
index dc9b3cc..87b83ab 100644
--- a/kernel/ioctl.c
+++ b/kernel/ioctl.c
@@ -270,6 +270,11 @@ COUNT DosDevIOctl(lregs * r)
           {
             return DE_INVLDFUNC;
           }
+          if (r->AL == 0x0D && (r->CX & ~(0x486B-0x084A)) == 0x084A)
+          {             /* 084A/484A, 084B/484B, 086A/486A, 086B/486B */
+            r->AX = 0;  /* (lock/unlock logical/physical volume) */
+            break;      /* simulate success for MS-DOS 7+ SCANDISK etc. --LG */
+          }
 
           CharReqHdr.r_command = nMode;
           execrh((request FAR *) & CharReqHdr, dpbp->dpb_device);