libfshelp: Add function to map over all active translators.

* libdiskfs/file-syncfs.c (diskfs_S_file_syncfs): Use the new function.
* libdiskfs/fsys-options.c (diskfs_S_fsys_set_options): Likewise.
* libdiskfs/fsys-syncfs.c (diskfs_S_fsys_syncfs): Likewise.
* libdiskfs/shutdown.c (diskfs_shutdown): Likewise.
* libfshelp/fshelp.h (fshelp_map_active_translators): New declaration.
* libfshelp/translator-list.c (fshelp_map_active_translators): New
function.
* libnetfs/file-syncfs.c (netfs_S_file_syncfs): Use the new function.
* libnetfs/fsys-set-options.c (netfs_S_fsys_set_options): Likewise.
* libnetfs/fsys-syncfs.c (netfs_S_fsys_syncfs): Likewise.
* libnetfs/shutdown.c (netfs_shutdown): Likewise.

2 files changed, 36 insertions, 0 deletions

diff --git a/libfshelp/fshelp.h b/libfshelp/fshelp.h
index ecd9335d..d1dd49c4 100644
--- a/libfshelp/fshelp.h
+++ b/libfshelp/fshelp.h
@@ -71,6 +71,16 @@ fshelp_get_active_translators (char **translators,
 			       fshelp_filter filter,
 			       const char *prefix);
 
+/* Call FUN for each active translator.  If FUN returns non-zero, the
+   iteration immediately stops, and returns that value.  FUN is called
+   with COOKIE, the name of the translator, and the translators
+   control port.  */
+error_t
+fshelp_map_active_translators (error_t (*fun)(void *cookie,
+					      const char *name,
+					      mach_port_t control),
+			       void *cookie);
+
 
 /* Passive translator linkage */
 /* These routines are self-contained and start passive translators,
diff --git a/libfshelp/translator-list.c b/libfshelp/translator-list.c
index b8fe3f94..c64e1747 100644
--- a/libfshelp/translator-list.c
+++ b/libfshelp/translator-list.c
@@ -229,3 +229,29 @@ fshelp_get_active_translators (char **translators,
   pthread_mutex_unlock (&translator_ihash_lock);
   return err;
 }
+
+/* Call FUN for each active translator.  If FUN returns non-zero, the
+   iteration immediately stops, and returns that value.  FUN is called
+   with COOKIE, the name of the translator, and the translators
+   control port.  */
+error_t
+fshelp_map_active_translators (error_t (*fun)(void *cookie,
+					      const char *name,
+					      mach_port_t control),
+			       void *cookie)
+{
+  error_t err = 0;
+  pthread_mutex_lock (&translator_ihash_lock);
+
+  HURD_IHASH_ITERATE (&translator_ihash, value)
+    {
+      struct translator *t = value;
+
+      err = fun (cookie, t->name, t->active);
+      if (err)
+	break;
+    }
+
+  pthread_mutex_unlock (&translator_ihash_lock);
+  return err;
+}