From 8352b022201c7446e90e5cc1d9f0e2f8651543f3 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Tue, 24 Nov 2015 01:20:57 +0100
Subject: [PATCH hurd 4/5] libfshelp: improve translator list

Use the path names of active translators as keys in the hash table.

* libfshelp/translator-list.c (hash, compare): New functions.
(translator_ihash): Use generalized key interface.
(fshelp_set_active_translator): Update accordingly.
(fshelp_remove_active_translator): Likewise.
---
 libfshelp/translator-list.c | 59 +++++++++++++++++++++++++++------------------
 1 file changed, 35 insertions(+), 24 deletions(-)

diff --git a/libfshelp/translator-list.c b/libfshelp/translator-list.c
index 87d7f6a..fa754ae 100644
--- a/libfshelp/translator-list.c
+++ b/libfshelp/translator-list.c
@@ -1,6 +1,6 @@
 /* A list of active translators.
 
-   Copyright (C) 2013,14 Free Software Foundation, Inc.
+   Copyright (C) 2013,14,15 Free Software Foundation, Inc.
 
    Written by Justus Winter <4winter@informatik.uni-hamburg.de>
 
@@ -39,18 +39,12 @@ struct translator
   mach_port_t active;
 };
 
-/* The list of active translators.  */
-static struct hurd_ihash translator_ihash
-  = HURD_IHASH_INITIALIZER (HURD_IHASH_NO_LOCP);
-
-/* The lock protecting the translator_ihash.  */
-static pthread_mutex_t translator_ihash_lock = PTHREAD_MUTEX_INITIALIZER;
-
+/* The hash table requires some callback functions.  */
 static void
-translator_ihash_cleanup (void *element, void *arg)
+cleanup (void *value, void *arg)
 {
   error_t err;
-  struct translator *translator = element;
+  struct translator *translator = value;
 
   if (translator->pi)
     ports_port_deref (translator->pi);
@@ -60,6 +54,26 @@ translator_ihash_cleanup (void *element, void *arg)
   free (translator);
 }
 
+static hurd_ihash_key_t
+hash (void *key)
+{
+  const char *path = key;
+  return (hurd_ihash_key_t) hurd_ihash_fasthash32 (path, strlen (path), 0);
+}
+
+static int
+compare (void *a, void *b)
+{
+  return strcmp ((const char *) a, (const char *) b) == 0;
+}
+
+/* The list of active translators.  */
+static struct hurd_ihash translator_ihash
+  = HURD_IHASH_INITIALIZER_GKI (HURD_IHASH_NO_LOCP, cleanup, hash, compare);
+
+/* The lock protecting the translator_ihash.  */
+static pthread_mutex_t translator_ihash_lock = PTHREAD_MUTEX_INITIALIZER;
+
 /* Record an active translator being bound to the given file name
    NAME.  ACTIVE is the control port of the translator.  */
 error_t
@@ -68,20 +82,16 @@ fshelp_set_active_translator (struct port_info *pi,
 			      mach_port_t active)
 {
   error_t err = 0;
-  pthread_mutex_lock (&translator_ihash_lock);
-
-  if (! translator_ihash.cleanup)
-    hurd_ihash_set_cleanup (&translator_ihash, translator_ihash_cleanup, NULL);
+  struct translator *t;
+  hurd_ihash_locp_t slot;
 
-  struct translator *t = NULL;
-  HURD_IHASH_ITERATE (&translator_ihash, value)
-    {
-      t = value;
-      if (strcmp (name, t->name) == 0)
-	goto update; /* Entry exists.  */
-    }
+  pthread_mutex_lock (&translator_ihash_lock);
+  t = hurd_ihash_locp_find (&translator_ihash, (hurd_ihash_key_t) name,
+			    &slot);
+  if (t)
+    goto update; /* Entry exists.  */
 
-  t = malloc (sizeof (struct translator));
+  t = malloc (sizeof *t);
   if (! t)
     {
       err = errno;
@@ -98,7 +108,8 @@ fshelp_set_active_translator (struct port_info *pi,
       goto out;
     }
 
-  err = hurd_ihash_add (&translator_ihash, (hurd_ihash_key_t) t, t);
+  err = hurd_ihash_locp_add (&translator_ihash, slot,
+			     (hurd_ihash_key_t) t->name, t);
   if (err)
     goto out;
 
@@ -165,7 +176,7 @@ fshelp_remove_active_translator (mach_port_t active)
     }
 
   if (t)
-    hurd_ihash_remove (&translator_ihash, (hurd_ihash_key_t) t);
+    hurd_ihash_remove (&translator_ihash, (hurd_ihash_key_t) t->name);
 
   pthread_mutex_unlock (&translator_ihash_lock);
   return err;
-- 
2.1.4