--- loncom/lonnet/perl/lonnet.pm	2004/09/17 02:40:35	1.542
+++ loncom/lonnet/perl/lonnet.pm	2004/09/20 19:54:47	1.543
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.542 2004/09/17 02:40:35 albertel Exp $
+# $Id: lonnet.pm,v 1.543 2004/09/20 19:54:47 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -821,11 +821,12 @@ sub getsection {
 }
 
 
-my $disk_caching_disabled=0;
+my $disk_caching_disabled=1;
 
 sub devalidate_cache {
     my ($cache,$id,$name) = @_;
     delete $$cache{$id.'.time'};
+    delete $$cache{$id.'.file'};
     delete $$cache{$id};
     if (1 || $disk_caching_disabled) { return; }
     my $filename=$perlvar{'lonDaemons'}.'/tmp/lonnet_internal_cache_'.$name.".db";
@@ -864,9 +865,25 @@ sub is_cached {
 	return (undef,undef);
     } else {
 	if (time-($$cache{$id.'.time'})>$time) {
-#	    &logthis("Devalidating $id - ".time-($$cache{$id.'.time'}));
-	    &devalidate_cache($cache,$id,$name);
-	    return (undef,undef);
+	    if (exists($$cache{$id.'.file'})) {
+		foreach my $filename (@{ $$cache{$id.'.file'} }) {
+		    my $mtime=(stat($filename))[9];
+		    #+1 is to take care of edge effects
+		    if ($mtime && (($mtime+1) < ($$cache{$id.'.time'}))) {
+#			&logthis("Upping $mtime - ".$$cache{$id.'.time'}.
+#				 "$id because of $filename");
+		    } else {
+			&logthis("Devalidating $filename $id - ".(time-($$cache{$id.'.time'})));
+			&devalidate_cache($cache,$id,$name);
+			return (undef,undef);
+		    }
+		}
+		$$cache{$id.'.time'}=time;
+	    } else {
+#		&logthis("Devalidating $id - ".time-($$cache{$id.'.time'}));
+		&devalidate_cache($cache,$id,$name);
+		return (undef,undef);
+	    }
 	}
     }
     return ($$cache{$id},1);
@@ -4262,7 +4279,9 @@ sub metadata {
         unless ($filename=~/\.meta$/) { $filename.='.meta'; }
 	my $metastring;
 	if ($uri !~ m|^uploaded/|) {
-	    $metastring=&getfile(&filelocation('',&clutter($filename)));
+	    my $file=&filelocation('',&clutter($filename));
+	    push(@{$metacache{$uri.'.file'}},$file);
+	    $metastring=&getfile($file);
 	}
         my $parser=HTML::LCParser->new(\$metastring);
         my $token;