From 3cb783af3a92f0ab0fe310e8325693020c7ae2f7 Mon Sep 17 00:00:00 2001
From: johann <johann>
Date: Tue, 6 Oct 2009 08:22:21 +0000
Subject: [PATCH] Branch b1_8 b=20903 i=rread i=dmitry

Make obd_zombie_barrier() no-op if called from the zombie thread context.
---
 lustre/obdclass/genops.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lustre/obdclass/genops.c b/lustre/obdclass/genops.c
index 99f53e5..1f7df29 100644
--- a/lustre/obdclass/genops.c
+++ b/lustre/obdclass/genops.c
@@ -1466,6 +1466,7 @@ static struct completion        obd_zombie_start;
 static struct completion        obd_zombie_stop;
 static unsigned long            obd_zombie_flags;
 static cfs_waitq_t              obd_zombie_waitq;
+static pid_t                    obd_zombie_pid;
 
 enum {
         OBD_ZOMBIE_STOP = 1
@@ -1511,6 +1512,10 @@ static int obd_zombie_is_idle(void)
 void obd_zombie_barrier(void)
 {
         struct l_wait_info lwi = { 0 };
+
+        if (obd_zombie_pid == cfs_curproc_pid())
+                /* don't wait for myself */
+                return;
         l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
 }
 EXPORT_SYMBOL(obd_zombie_barrier);
@@ -1528,6 +1533,8 @@ static int obd_zombie_impexp_thread(void *unused)
 
         complete(&obd_zombie_start);
 
+        obd_zombie_pid = cfs_curproc_pid();
+
         while(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
                 struct l_wait_info lwi = { 0 };
 
@@ -1577,6 +1584,7 @@ int obd_zombie_impexp_init(void)
         init_completion(&obd_zombie_start);
         init_completion(&obd_zombie_stop);
         cfs_waitq_init(&obd_zombie_waitq);
+        obd_zombie_pid = 0;
 
 #ifdef __KERNEL__
         rc = cfs_kernel_thread(obd_zombie_impexp_thread, NULL, 0);
-- 
1.8.3.1