From: Luciano Chavez <lnx1138@us.ibm.com>
Date: Fri, 9 Mar 2007 03:07:52 +0000 (-0600)
Subject: sfdisk: setting default geometry values
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=653872612c2249dd892f5f2f6cc9b1e3abd24b45;p=util-linux

sfdisk: setting default geometry values

The cfdisk and fdisk set defaults for heads and sectors in order to handle a
situation when the get_geometry() ends up with zeroes for the disk geometry for
device-mapper devices. This patch add same functionally to sfdisk.

You know that a dmsetup setgeometry of the the dm device can be used to
circumvent the issue but users may not immediately realize they need to do
that.
---

diff --git a/fdisk/sfdisk.c b/fdisk/sfdisk.c
index 79e9c20e..baacc077 100644
--- a/fdisk/sfdisk.c
+++ b/fdisk/sfdisk.c
@@ -469,8 +469,8 @@ get_cylindersize(char *dev, int fd, int silent) {
 
     R = get_geometry(dev, fd, silent);
 
-    B.heads = (U.heads ? U.heads : R.heads);
-    B.sectors = (U.sectors ? U.sectors : R.sectors);
+    B.heads = (U.heads ? U.heads : R.heads ? R.heads : 255);
+    B.sectors = (U.sectors ? U.sectors : R.sectors ? R.sectors : 63);
     B.cylinders = (U.cylinders ? U.cylinders : R.cylinders);
 
     B.cylindersize = B.heads * B.sectors;