[src/trunk]: src/sbin/cgdconfig Check whether the cgd device sel...

[kre <kre%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/22c28c096042
branches:  trunk
changeset: 318791:22c28c096042
user:      kre <kre%NetBSD.org@localhost>
date:      Sat May 05 11:28:44 2018 +0000
description:
Check whether the cgd device selected is available to be
configured,that is, not already in use, before requesting
passwords from the user (or elsewhere).

diffstat:

 sbin/cgdconfig/cgdconfig.c |  18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)

diffs (39 lines):

diff -r b28cccd19990 -r 22c28c096042 sbin/cgdconfig/cgdconfig.c
--- a/sbin/cgdconfig/cgdconfig.c        Sat May 05 11:16:30 2018 +0000
+++ b/sbin/cgdconfig/cgdconfig.c        Sat May 05 11:28:44 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cgdconfig.c,v 1.41 2017/01/10 20:45:19 christos Exp $ */
+/* $NetBSD: cgdconfig.c,v 1.42 2018/05/05 11:28:44 kre Exp $ */
 
 /*-
  * Copyright (c) 2002, 2003 The NetBSD Foundation, Inc.
@@ -33,7 +33,7 @@
 #ifndef lint
 __COPYRIGHT("@(#) Copyright (c) 2002, 2003\
  The NetBSD Foundation, Inc.  All rights reserved.");
-__RCSID("$NetBSD: cgdconfig.c,v 1.41 2017/01/10 20:45:19 christos Exp $");
+__RCSID("$NetBSD: cgdconfig.c,v 1.42 2018/05/05 11:28:44 kre Exp $");
 #endif
 
 #include <err.h>
@@ -515,6 +515,20 @@
        char             devicename[PATH_MAX];
        const char      *dev = NULL;    /* XXX: gcc */
 
+       if ((
+         fd = opendisk1(*argv, O_RDWR, cgdname, sizeof(cgdname), 1, prog_open)
+           ) != -1) {
+               struct cgd_user cgu;
+
+               cgu.cgu_unit = -1;
+               if (prog_ioctl(fd, CGDIOCGET, &cgu) != -1 && cgu.cgu_dev != 0) {
+                       warnx("device %s already in use", *argv);
+                       close(fd);
+                       return -1;
+               }
+               close(fd);
+       }
+
        if (argc == 2 || argc == 3) {
                dev = getfsspecname(devicename, sizeof(devicename), argv[1]);
                if (dev == NULL) {