From baec98579514cae9888f15af623dc59c0e89e434 Mon Sep 17 00:00:00 2001
From: Pavel Rochnyack <pavel2000@ngs.ru>
Date: Wed, 25 May 2016 13:54:46 +0600
Subject: [PATCH] disk plugin: Initialize udev context only once, not per each
 read

---
 src/disk.c | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/src/disk.c b/src/disk.c
index 07383c75..255d4db6 100644
--- a/src/disk.c
+++ b/src/disk.c
@@ -230,7 +230,16 @@ static int disk_init (void)
 /* #endif HAVE_IOKIT_IOKITLIB_H */
 
 #elif KERNEL_LINUX
-	/* do nothing */
+#if HAVE_LIBUDEV
+	if (conf_udev_name_attr != NULL)
+	{
+		handle_udev = udev_new();
+		if (handle_udev == NULL) {
+			ERROR ("disk plugin: udev_new() failed!");
+			return (-1);
+		}
+	}
+#endif /* HAVE_LIBUDEV */
 /* #endif KERNEL_LINUX */
 
 #elif KERNEL_FREEBSD
@@ -272,6 +281,17 @@ static int disk_init (void)
 	return (0);
 } /* int disk_init */
 
+static int disk_shutdown (void)
+{
+#if KERNEL_LINUX
+#if HAVE_LIBUDEV
+	if (handle_udev != NULL)
+		udev_unref(handle_udev);
+#endif /* HAVE_LIBUDEV */
+#endif /* KERNEL_LINUX */
+	return (0);
+} /* int disk_shutdown */
+
 static void disk_submit (const char *plugin_instance,
 		const char *type,
 		derive_t read, derive_t write)
@@ -690,10 +710,6 @@ static int disk_read (void)
 		fieldshift = 1;
 	}
 
-#if HAVE_LIBUDEV
-	handle_udev = udev_new();
-#endif
-
 	while (fgets (buffer, sizeof (buffer), fh) != NULL)
 	{
 		char *disk_name;
@@ -908,9 +924,6 @@ static int disk_read (void)
 #endif
 	} /* while (fgets (buffer, sizeof (buffer), fh) != NULL) */
 
-#if HAVE_LIBUDEV
-	udev_unref(handle_udev);
-#endif
 
 	fclose (fh);
 /* #endif defined(KERNEL_LINUX) */
@@ -1061,5 +1074,6 @@ void module_register (void)
   plugin_register_config ("disk", disk_config,
       config_keys, config_keys_num);
   plugin_register_init ("disk", disk_init);
+  plugin_register_shutdown ("disk", disk_shutdown);
   plugin_register_read ("disk", disk_read);
 } /* void module_register */
-- 
2.30.2