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From: Warner Losh <imp@FreeBSD.org>
Date: Fri, 3 Dec 2010 07:39:29 +0000 (UTC)
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Subject: svn commit: r216145 - head/tools/tools/nanobsd
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Author: imp
Date: Fri Dec  3 07:39:29 2010
New Revision: 216145
URL: http://svn.freebsd.org/changeset/base/216145

Log:
  o Mount the device async when we're doing the copy.
  o Create a sparse file instead of a fully zerod one.  This trades the
    possibiltiy of running out of space during the build for the speed
    gain not having do write all those zeros...
  
  Submitted by:	n_hibma

Modified:
  head/tools/tools/nanobsd/nanobsd.sh

Modified: head/tools/tools/nanobsd/nanobsd.sh
==============================================================================
--- head/tools/tools/nanobsd/nanobsd.sh	Fri Dec  3 07:33:43 2010	(r216144)
+++ head/tools/tools/nanobsd/nanobsd.sh	Fri Dec  3 07:39:29 2010	(r216145)
@@ -404,7 +404,7 @@ newfs_part ( ) (
 	lbl=$3
 	echo newfs ${NANO_NEWFS} ${NANO_LABEL:+-L${NANO_LABEL}${lbl}} ${dev}
 	newfs ${NANO_NEWFS} ${NANO_LABEL:+-L${NANO_LABEL}${lbl}} ${dev}
-	mount ${dev} ${mnt}
+	mount -o async ${dev} ${mnt}
 )
 
 populate_slice ( ) (
@@ -513,8 +513,8 @@ create_i386_diskimage ( ) (
 			-y ${NANO_HEADS}`
 	else
 		echo "Creating md backing file..."
-		dd if=/dev/zero of=${IMG} bs=${NANO_SECTS}b \
-			count=`expr ${NANO_MEDIASIZE} / ${NANO_SECTS}`
+		rm -f ${IMG}
+		dd if=/dev/zero of=${IMG} seek=${NANO_MEDIASIZE} count=0
 		MD=`mdconfig -a -t vnode -f ${IMG} -x ${NANO_SECTS} \
 			-y ${NANO_HEADS}`
 	fi