Add the watchdogs patting during the (shutdown time) disk syncing and

disk dumping.
With the option SW_WATCHDOG on, these operations are doomed to let
watchdog fire, fi they take too long.

I implemented the stubs this way because I really want wdog_kern_*
KPI to not be dependant by SW_WATCHDOG being on (and really, the option
only enables watchdog activation in hardclock) and also avoid to
call them when not necessary (avoiding not-volountary watchdog
activations).

Sponsored by:	Sandvine Incorporated
Discussed with:	emaste, des
MFC after:	2 weeks

1 files changed, 8 insertions, 0 deletions

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 25bfa7c..dead546 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -42,6 +42,7 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_ddb.h"
+#include "opt_watchdog.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -72,6 +73,9 @@ __FBSDID("$FreeBSD$");
 #include <sys/syslog.h>
 #include <sys/vmmeter.h>
 #include <sys/vnode.h>
+#ifdef SW_WATCHDOG
+#include <sys/watchdog.h>
+#endif
 
 #include <machine/stdarg.h>
 
@@ -1839,6 +1843,10 @@ sched_sync(void)
 				LIST_INSERT_HEAD(next, bo, bo_synclist);
 				continue;
 			}
+#ifdef SW_WATCHDOG
+			if (first_printf == 0)
+				wdog_kern_pat(WD_LASTVAL);
+#endif
 		}
 		if (!LIST_EMPTY(gslp)) {
 			mtx_unlock(&sync_mtx);