[src/trunk]: src/sys/dev Calculate a missing cylinder count in the geometry s...

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

details:   https://anonhg.NetBSD.org/src/rev/0d54a7adac96
branches:  trunk
changeset: 836276:0d54a7adac96
user:      mlelstv <mlelstv%NetBSD.org@localhost>
date:      Sun Oct 07 11:54:14 2018 +0000

description:
Calculate a missing cylinder count in the geometry spec from image size.

diffstat:

 sys/dev/vnd.c |  13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diffs (41 lines):

diff -r dae699ba845b -r 0d54a7adac96 sys/dev/vnd.c
--- a/sys/dev/vnd.c     Sun Oct 07 11:51:26 2018 +0000
+++ b/sys/dev/vnd.c     Sun Oct 07 11:54:14 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: vnd.c,v 1.267 2018/10/07 11:51:26 mlelstv Exp $        */
+/*     $NetBSD: vnd.c,v 1.268 2018/10/07 11:54:14 mlelstv Exp $        */
 
 /*-
  * Copyright (c) 1996, 1997, 1998, 2008 The NetBSD Foundation, Inc.
@@ -91,7 +91,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vnd.c,v 1.267 2018/10/07 11:51:26 mlelstv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vnd.c,v 1.268 2018/10/07 11:54:14 mlelstv Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_vnd.h"
@@ -1427,7 +1427,6 @@
                         * Sanity-check the sector size.
                         */
                        if (!DK_DEV_BSIZE_OK(vnd->sc_geom.vng_secsize) ||
-                           vnd->sc_geom.vng_ncylinders == 0 ||
                            vnd->sc_geom.vng_ntracks == 0 ||
                            vnd->sc_geom.vng_nsectors == 0) {
                                error = EINVAL;
@@ -1435,6 +1434,14 @@
                        }
 
                        /*
+                        * Compute missing cylinder count from size
+                        */
+                       if (vnd->sc_geom.vng_ncylinders == 0)
+                               vnd->sc_geom.vng_ncylinders = vnd->sc_size /
+                                       (vnd->sc_geom.vng_ntracks *
+                                       vnd->sc_geom.vng_nsectors);
+
+                       /*
                         * Compute the size (in DEV_BSIZE blocks) specified
                         * by the geometry.
                         */