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DragonFly kernel List (threaded) for 2006-04
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Re: fishy messages in HEAD

From: YONETANI Tomokazu <qhwt+dfly@xxxxxxxxxx>
Date: Fri, 14 Apr 2006 19:09:00 +0900

On Fri, Apr 14, 2006 at 12:39:29AM -0700, Matthew Dillon wrote:
>     What I think is happening is that /dev/null gets created 644, then
>     chmod'd 666, but the chmod doesn't get synchronized to disk in a timely
>     manner.  A normal shutdown ought to sync it, but an abnormal shutdown
>     might not.

mknod(2) does accept the mode for the created node, but there's no way to
tell mknod(8) to set the mode on the command line arguments (except via
umask setting).  The mode argument to mknod(2) is set to 0666 and is
overridden by umask setting(usually set to 022).  I think that the following
small patch to MAKEDEV is enough to avoid the glitch.  (Making mknod(8) to
accept `-m mode' looks cleaner, but relying on the new option doesn't work
when DESTDIR is set to other location than /).

Index: etc/MAKEDEV
RCS file: /home/source/dragonfly/cvs/src/etc/MAKEDEV,v
retrieving revision 1.20
diff -u -r1.20 MAKEDEV
--- etc/MAKEDEV	7 May 2005 17:38:33 -0000	1.20
+++ etc/MAKEDEV	14 Apr 2006 08:41:31 -0000
@@ -374,8 +374,11 @@
 	# Finally, set ownership and permissions.
+	umask=`echo $perms | $tr '01234567' '76543210'`
+	savedumask=`umask`
+	umask $umask
 	$mknod $dev$unit $1 $2 $3 $owner
-	chmod $perms $dev$unit
+	umask $savedumask

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