[pve-devel] [PATCH V3 storage 3/4] expiring cached iSCSI configuration after 15 seconds, after which it is re-read from the portal

[Udo Rader]

Signed-off-by: Udo Rader <udo.rader at bestsolution.at>
---
 PVE/Storage/LunCmd/LIO.pm | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/PVE/Storage/LunCmd/LIO.pm b/PVE/Storage/LunCmd/LIO.pm
index 2d8c2ee..44dd508 100644
--- a/PVE/Storage/LunCmd/LIO.pm
+++ b/PVE/Storage/LunCmd/LIO.pm
@@ -1,4 +1,4 @@
-package PVE::Storage::LunCmd::LIO;
+ackage PVE::Storage::LunCmd::LIO;
 
 # lightly based on code from Iet.pm 
 #
@@ -35,6 +35,8 @@ my @CONFIG_FILES = (
 my $BACKSTORE = '/backstores/block';
 
 my $SETTINGS = undef;
+my $SETTINGS_TIMESTAMP = 0;
+my $SETTINGS_MAXAGE = 15; # in seconds
 
 my @ssh_opts = ('-o', 'BatchMode=yes');
 my @ssh_cmd = ('/usr/bin/ssh', @ssh_opts);
@@ -348,7 +350,8 @@ my $modify_lun = sub {
     my ($scfg, $timeout, $method, @params) = @_;
     my $msg;
 
-    if ($delete_lun->($scfg, $timeout, $method, @params)) {
+    $msg = $delete_lun->($scfg, $timeout, $method, @params);
+    if ($msg) {
         $msg = $create_lun->($scfg, $timeout, $method, @params);
     }
 
@@ -383,7 +386,13 @@ sub run_lun_command {
     my ($scfg, $timeout, $method, @params) = @_;
 
     # fetch configuration from target if we haven't yet
-    $parser->($scfg) unless $SETTINGS;
+    # or if our configuration is stale
+    my $timediff = time - $SETTINGS_TIMESTAMP;
+    if ( ! $SETTINGS || $timediff > $SETTINGS_MAXAGE ) {
+        $SETTINGS_TIMESTAMP = time;
+        $parser->($scfg);
+    }
+
     my $cmdmap = $get_lun_cmd_map->($method);
     my $msg = $cmdmap->{cmd}->($scfg, $timeout, $method, @params);
 
-- 
2.17.1