iet prioritizer fix

- revert the path weight allocation : heavy weight for the
preferred path, light for others
- mention the original author's name
- embed a short usage documentation

diff --git a/libmultipath/prioritizers/iet.c b/libmultipath/prioritizers/iet.c
index 59bdee4..2570b61 100644 (file)
--- a/libmultipath/prioritizers/iet.c
+++ b/libmultipath/prioritizers/iet.c
@@ -9,6 +9,22 @@
 #include <debug.h>
 #include <unistd.h>
 
+//
+// This prioritizer suits iSCSI needs, makes it possible to prefer one path.
+//
+// (It's a bit of a misnomer since supports the client side [eg. open-iscsi]
+//  instead of just "iet".)
+//
+// Usage: 
+//   prio      "iet"
+//   prio_args "preferredip=10.11.12.13"
+//
+// Uses /dev/disk/by-path to find the IP of the device.
+// Assigns prio 20 (high) to the preferred IP and prio 10 (low) to the rest.
+//
+// by Olivier Lambert <lambert.olivier.gmail.com>
+//
+
 #define dc_log(prio, msg) condlog(prio, "%s: iet prio: " msg, dev)
 //
 // name: find_regex
@@ -102,7 +118,7 @@ int iet_prio(const char *dev, char * args)
                                                // high prio
                                                free(ip);
                                                closedir(dir_p);
-                                               return 10;
+                                               return 20;
                                        }
                                        free(ip);
                                }
@@ -115,7 +131,7 @@ int iet_prio(const char *dev, char * args)
        }
        // nothing found, low prio
        closedir(dir_p);
-       return 20;
+       return 10;
 }
 
 int getprio(struct path * pp, char * args)