--- loncom/lonnet/perl/lonnet.pm	2005/07/26 13:30:34	1.648
+++ loncom/lonnet/perl/lonnet.pm	2005/09/01 06:47:26	1.654
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.648 2005/07/26 13:30:34 raeburn Exp $
+# $Id: lonnet.pm,v 1.654 2005/09/01 06:47:26 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -767,6 +767,13 @@ sub validate_access_key {
 }
 
 # ------------------------------------- Find the section of student in a course
+sub devalidate_getsection_cache {
+    my ($udom,$unam,$courseid)=@_;
+    $courseid=~s/\_/\//g;
+    $courseid=~s/^(\w)/\/$1/;
+    my $hashid="$udom:$unam:$courseid";
+    &devalidate_cache_new('getsection',$hashid);
+}
 
 sub getsection {
     my ($udom,$unam,$courseid)=@_;
@@ -3767,6 +3774,8 @@ sub modify_student_enrollment {
 		   $cdom,$cnum);
     unless (($reply eq 'ok') || ($reply eq 'delayed')) {
 	return 'error: '.$reply;
+    } else {
+	&devalidate_getsection_cache($udom,$uname,$cid);
     }
     # Add student role to user
     my $uurl='/'.$cid;
@@ -4074,28 +4083,25 @@ sub unmark_as_readonly {
     my ($tmp)=keys(%current_permissions);
     if ($tmp=~/^error:/) { undef(%current_permissions); }
     my @readonly_files = &get_marked_as_readonly($domain,$user,$what);
-    foreach my $file(@readonly_files){
-        my $current_locks = $current_permissions{$file};
+    foreach my $file (@readonly_files) {
+	if (defined($file_name) && ($file_name ne $file)) { next; }
+	my $current_locks = $current_permissions{$file};
         my @new_locks;
         my @del_keys;
         if (ref($current_locks) eq "ARRAY"){
             foreach my $locker (@{$current_locks}) {
                 my $compare=$locker;
                 if (ref($locker)) { $compare=join('',@{$locker}) };
-                if ($compare eq $symb_crs) {
-                    if (defined($file_name) && ($file_name ne $file)) {
-                        push(@new_locks, $what);
-                    }
-                } else {
-                    push(@new_locks, $what);
+                if ($compare ne $symb_crs) {
+                    push(@new_locks, $locker);
                 }
             }
-            if (@new_locks > 0) {
+            if (scalar(@new_locks) > 0) {
                 $current_permissions{$file} = \@new_locks;
             } else {
                 push(@del_keys, $file);
                 &del('file_permissions',\@del_keys, $domain, $user);
-                delete $current_permissions{$file};
+                delete($current_permissions{$file});
             }
         }
     }
@@ -4423,8 +4429,10 @@ sub EXT {
     if ($realm eq 'user') {
 # --------------------------------------------------------------- user.resource
 	if ($space eq 'resource') {
-	    if (defined($Apache::lonhomework::parsing_a_problem) ||
-		defined($Apache::lonhomework::parsing_a_task)) {
+	    if ( (defined($Apache::lonhomework::parsing_a_problem)
+		  || defined($Apache::lonhomework::parsing_a_task))
+		 &&
+		 ($symbparm eq &symbread()) ) {
 		return $Apache::lonhomework::history{$qualifierrest};
 	    } else {
 		my %restored;
@@ -5644,6 +5652,9 @@ sub filelocation {
     if ($file=~m:^/~:) { # is a contruction space reference
         $location = $file;
         $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
+    } elsif ($file=~m:^/home/[^/]*/public_html/:) {
+	# is a correct contruction space reference
+        $location = $file;
     } elsif ($file=~/^\/*(uploaded|editupload)/) { # is an uploaded file
         my ($udom,$uname,$filename)=
   	    ($file=~m -^/+(?:uploaded|editupload)/+([^/]+)/+([^/]+)/+(.*)$-);
@@ -5885,14 +5896,21 @@ BEGIN {
 
 sub get_iphost {
     if (%iphost) { return %iphost; }
+    my %name_to_ip;
     foreach my $id (keys(%hostname)) {
 	my $name=$hostname{$id};
-	my $ip = gethostbyname($name);
-	if (!$ip || length($ip) ne 4) {
-	    &logthis("Skipping host $id name $name no IP found\n");
-	    next;
+	my $ip;
+	if (!exists($name_to_ip{$name})) {
+	    $ip = gethostbyname($name);
+	    if (!$ip || length($ip) ne 4) {
+		&logthis("Skipping host $id name $name no IP found\n");
+		next;
+	    }
+	    $ip=inet_ntoa($ip);
+	    $name_to_ip{$name} = $ip;
+	} else {
+	    $ip = $name_to_ip{$name};
 	}
-	$ip=inet_ntoa($ip);
 	push(@{$iphost{$ip}},$id);
     }
     return %iphost;