From a9cb173f7674d311624c34205f1417b31972d1f2 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Wed, 5 Apr 2006 04:50:08 +0000
Subject: r14918: cleaner handling of systems without inotify (This used to be
 commit cf17ff15b15942f0ce068dd0a94b3b565a9b93cb)

---
 source4/ntvfs/common/notify.c     | 57 ++++++++++++++++++++++-----------------
 source4/ntvfs/sysdep/inotify.c    |  2 +-
 source4/ntvfs/sysdep/sys_notify.c |  4 +++
 3 files changed, 38 insertions(+), 25 deletions(-)

(limited to 'source4')

diff --git a/source4/ntvfs/common/notify.c b/source4/ntvfs/common/notify.c
index 595a0f6566..9ea024f2fc 100644
--- a/source4/ntvfs/common/notify.c
+++ b/source4/ntvfs/common/notify.c
@@ -267,6 +267,25 @@ static void sys_notify_callback(struct sys_notify_context *ctx,
 	listel->callback(listel->private, ev);
 }
 
+/*
+  add an entry to the notify array
+*/
+static NTSTATUS notify_add_array(struct notify_context *notify, struct notify_entry *e,
+				 const char *path, void *private)
+{
+	notify->array->entries[notify->array->num_entries] = *e;
+	notify->array->entries[notify->array->num_entries].private = private;
+	notify->array->entries[notify->array->num_entries].server = notify->server;
+	
+	if (path) {
+		notify->array->entries[notify->array->num_entries].path = path;
+	}
+
+	notify->array->num_entries++;
+	
+	return notify_save(notify);
+}
+
 /*
   add a notify watch. This is called when a notify is first setup on a open
   directory handle.
@@ -312,33 +331,23 @@ NTSTATUS notify_add(struct notify_context *notify, struct notify_entry *e,
 	DLIST_ADD(notify->list, listel);
 
 	/* ignore failures from sys_notify */
-	status = sys_notify_watch(notify->sys_notify_ctx, e->path, e->filter, 
-				  sys_notify_callback, listel, 
-				  &listel->sys_notify_handle);
-	if (NT_STATUS_IS_OK(status)) {
-		talloc_steal(listel, listel->sys_notify_handle);
-		notify_unlock(notify);
-	} else {
-		notify->array->entries[notify->array->num_entries] = *e;
-		notify->array->entries[notify->array->num_entries].private = private;
-		notify->array->entries[notify->array->num_entries].server = notify->server;
-
-		if (path) {
-			notify->array->entries[notify->array->num_entries].path = path;
+	if (notify->sys_notify_ctx != NULL) {
+		status = sys_notify_watch(notify->sys_notify_ctx, e->path, e->filter, 
+					  sys_notify_callback, listel, 
+					  &listel->sys_notify_handle);
+		if (NT_STATUS_IS_OK(status)) {
+			/* if the kernel handler has said it can handle this notify then
+			   we don't need to add it to the array */
+			talloc_steal(listel, listel->sys_notify_handle);
+			goto done;
 		}
-
-		notify->array->num_entries++;
-
-		status = notify_save(notify);
-
-		notify_unlock(notify);
-
-		NT_STATUS_NOT_OK_RETURN(status);
 	}
 
-	if (path) {
-		talloc_free(path);
-	}
+	status = notify_add_array(notify, e, path, private);
+
+done:
+	notify_unlock(notify);
+	talloc_free(path);
 
 	return status;
 }
diff --git a/source4/ntvfs/sysdep/inotify.c b/source4/ntvfs/sysdep/inotify.c
index 31c408d112..ec8669306e 100644
--- a/source4/ntvfs/sysdep/inotify.c
+++ b/source4/ntvfs/sysdep/inotify.c
@@ -239,7 +239,7 @@ static int watch_destructor(void *ptr)
 
 /*
   add a watch. The watch is removed when the caller calls
-  talloc_free() on handle
+  talloc_free() on *handle
 */
 static NTSTATUS inotify_watch(struct sys_notify_context *ctx, const char *dirpath,
 			      uint32_t filter, sys_notify_callback_t callback,
diff --git a/source4/ntvfs/sysdep/sys_notify.c b/source4/ntvfs/sysdep/sys_notify.c
index fd29f42a0e..1927ac61ce 100644
--- a/source4/ntvfs/sysdep/sys_notify.c
+++ b/source4/ntvfs/sysdep/sys_notify.c
@@ -44,6 +44,10 @@ struct sys_notify_context *sys_notify_init(int snum,
 	const char *bname;
 	struct sys_notify_backend *b;
 
+	if (backends == NULL) {
+		return NULL;
+	}
+
 	if (ev == NULL) {
 		ev = event_context_find(mem_ctx);
 	}
-- 
cgit