Allow admins to specify a regex which is applied (in the negative) to the

output from df, similar to what security/200.chkmounts does.  This can be
useful to avoid listing automounted ZFS snapshots, for instance.

MFC after:	1 week

etc/periodic/daily/400.status-disks

@@ -16,7 +16,12 @@ case "$daily_status_disks_enable" in
 	echo ""
 	echo "Disk status:"
 
-	df $daily_status_disks_df_flags && rc=1 || rc=3
+	if [ -n "${daily_status_disks_ignore}" ] ; then
+		ignore="egrep -v ${daily_status_disks_ignore}"
+	else
+		ignore="cat"
+	fi
+	(df $daily_status_disks_df_flags | ${ignore}) && rc=1 || rc=3
 
 	# display which filesystems need backing up
 	if [ -s /etc/dumpdates ]; then