timeout and assert in invalidate import.

b=15716
i=rread
i=johann

lustre/ChangeLog

@@ -24,6 +24,13 @@ tbd Sun Microsystems, Inc.
 	  	'tunefs.lustre --param="mdt.quota_type=ug1" $MDTDEV'.
 	  For more information, please refer to bugzilla 13904.
 
+Severity   : minor
+Bugzilla   : 15716
+Description: timeout with invalidate import.
+Details    : ptlrpcd_check call obd_zombie_impexp_cull and wait request which should be
+             handled by ptlrpcd. This produce long age waiting and -ETIMEOUT
+             ptlrpc_invalidate_import and as result LASSERT.
+
 Severity   : enhancement
 Bugzilla   : 15741
 Description: Update to RHEL5 kernel-2.6.18-53.1.19.el5.

lustre/include/linux/obd_class.h

@@ -38,10 +38,6 @@
 #include <linux/timer.h>
 #endif
 
-void obd_zombie_impexp_init(void);
-void obd_zombie_impexp_cull(void);
-extern void (*obd_zombie_impexp_notify)(void);
-
 /* obdo.c */
 #ifdef __KERNEL__
 void obdo_from_iattr(struct obdo *oa, struct iattr *attr, unsigned ia_valid);

lustre/include/obd_class.h

@@ -84,6 +84,10 @@ char *obd_export_nid2str(struct obd_export *exp);
 int obd_export_evict_by_nid(struct obd_device *obd, char *nid);
 int obd_export_evict_by_uuid(struct obd_device *obd, char *uuid);
 
+int obd_zombie_impexp_init(void);
+void obd_zombie_impexp_stop(void);
+void obd_zombie_impexp_cull(void);
+
 /* obd_config.c */
 int class_process_config(struct lustre_cfg *lcfg);
 int class_process_proc_param(char *prefix, struct lprocfs_vars *lvars, 

lustre/obdclass/class_obd.c

@@ -610,6 +610,7 @@ static void cleanup_obdclass(void)
 
         class_handle_cleanup();
         class_exit_uuidlist();
+        obd_zombie_impexp_stop();
 
         memory_leaked = obd_memory_sum();
         pages_leaked = obd_pages_sum();

lustre/obdclass/genops.c

@@ -45,9 +45,7 @@ cfs_mem_cache_t *import_cachep;
 struct list_head  obd_zombie_imports;
 struct list_head  obd_zombie_exports;
 spinlock_t        obd_zombie_impexp_lock;
-void            (*obd_zombie_impexp_notify)(void) = NULL;
-EXPORT_SYMBOL(obd_zombie_impexp_notify);
-
+static void obd_zombie_impexp_notify(void);
 
 int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
 
@@ -1282,11 +1280,11 @@ int obd_export_evict_by_uuid(struct obd_device *obd, char *uuid)
 }
 EXPORT_SYMBOL(obd_export_evict_by_uuid);
 
-void obd_zombie_impexp_cull(void) 
+void obd_zombie_impexp_cull(void)
 {
         struct obd_import *import;
         struct obd_export *export;
-        
+
         do {
                 spin_lock (&obd_zombie_impexp_lock);
 
@@ -1297,7 +1295,7 @@ void obd_zombie_impexp_cull(void)
                                             imp_zombie_chain);
                         list_del(&import->imp_zombie_chain);
                 }
-                
+
                 export = NULL;
                 if (!list_empty(&obd_zombie_exports)) {
                         export = list_entry(obd_zombie_exports.next,
@@ -1307,7 +1305,7 @@ void obd_zombie_impexp_cull(void)
                 }
 
                 spin_unlock(&obd_zombie_impexp_lock);
-                
+
                 if (import != NULL)
                         class_import_destroy(import);
 
@@ -1316,11 +1314,121 @@ void obd_zombie_impexp_cull(void)
 
         } while (import != NULL || export != NULL);
 }
-EXPORT_SYMBOL(obd_zombie_impexp_cull);
 
-void obd_zombie_impexp_init(void)
+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;
+
+enum {
+        OBD_ZOMBIE_STOP = 1
+};
+
+int obd_zombi_impexp_check(void *arg)
 {
+        int rc;
+
+        spin_lock(&obd_zombie_impexp_lock);
+        rc = list_empty(&obd_zombie_imports) &&
+             list_empty(&obd_zombie_exports) &&
+             !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
+
+        spin_unlock(&obd_zombie_impexp_lock);
+
+        RETURN(rc);
+}
+
+static void obd_zombie_impexp_notify(void)
+{
+        cfs_waitq_signal(&obd_zombie_waitq);
+}
+
+#ifdef __KERNEL__
+
+static int obd_zombie_impexp_thread(void *unused)
+{
+        int rc;
+
+        if ((rc = cfs_daemonize_ctxt("obd_zombid"))) {
+                complete(&obd_zombie_start);
+                RETURN(rc);
+        }
+
+        complete(&obd_zombie_start);
+
+        while(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
+                struct l_wait_info lwi = { 0 };
+
+                l_wait_event(obd_zombie_waitq, !obd_zombi_impexp_check(NULL), &lwi);
+
+                obd_zombie_impexp_cull();
+        }
+
+        complete(&obd_zombie_stop);
+
+        RETURN(0);
+}
+
+#else /* ! KERNEL */
+
+static atomic_t zombi_recur = ATOMIC_INIT(0);
+static void *obd_zombi_impexp_work_cb;
+static void *obd_zombi_impexp_idle_cb;
+
+int obd_zombi_impexp_kill(void *arg)
+{
+        int rc = 0;
+
+	if (atomic_inc_return(&zombi_recur) == 1) {
+                obd_zombie_impexp_cull();
+                rc = 1;
+        }
+        atomic_dec(&zombi_recur);
+        return rc;
+}
+
+#endif
+
+int obd_zombie_impexp_init(void)
+{
+        int rc;
+
         CFS_INIT_LIST_HEAD(&obd_zombie_imports);
         CFS_INIT_LIST_HEAD(&obd_zombie_exports);
         spin_lock_init(&obd_zombie_impexp_lock);
+        init_completion(&obd_zombie_start);
+        init_completion(&obd_zombie_stop);
+        cfs_waitq_init(&obd_zombie_waitq);
+
+#ifdef __KERNEL__
+        rc = cfs_kernel_thread(obd_zombie_impexp_thread, NULL, 0);
+        if (rc < 0)
+                RETURN(rc);
+
+        wait_for_completion(&obd_zombie_start);
+#else
+
+        obd_zombi_impexp_work_cb =
+                liblustre_register_wait_callback("obd_zombi_impexp_kill",
+                                                 &obd_zombi_impexp_kill, NULL);
+
+        obd_zombi_impexp_idle_cb =
+                liblustre_register_idle_callback("obd_zombi_impexp_check",
+                                                 &obd_zombi_impexp_check, NULL);
+        rc = 0;
+
+#endif
+        RETURN(rc);
+}
+
+void obd_zombie_impexp_stop(void)
+{
+        set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
+        obd_zombie_impexp_notify();
+#ifdef __KERNEL__
+        wait_for_completion(&obd_zombie_stop);
+#else
+        liblustre_deregister_wait_callback(obd_zombi_impexp_work_cb);
+        liblustre_deregister_idle_callback(obd_zombi_impexp_idle_cb);
+#endif
 }

lustre/obdclass/obd_config.c

@@ -359,10 +359,10 @@ int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
                obd->obd_name, obd->obd_uuid.uuid);
 
         class_decref(obd);
-        
+
         /* not strictly necessary, but cleans up eagerly */
         obd_zombie_impexp_cull();
-        
+
         RETURN(0);
 }
 

lustre/ptlrpc/import.c

@@ -234,6 +234,7 @@ void ptlrpc_invalidate_import(struct obd_import *imp)
                         DEBUG_REQ(D_ERROR, req, "still on delayed list");
                 }
                 spin_unlock(&imp->imp_lock);
+                LASSERT(atomic_read(&imp->imp_inflight) == 0);
         }
 
   out:

lustre/ptlrpc/ptlrpcd.c

@@ -97,8 +97,6 @@ static int ptlrpcd_check(struct ptlrpcd_ctl *pc)
         if (test_bit(LIOD_STOP, &pc->pc_flags))
                 RETURN(1);
 
-        obd_zombie_impexp_cull();
-
         spin_lock(&pc->pc_set->set_new_req_lock);
         list_for_each_safe(pos, tmp, &pc->pc_set->set_new_requests) {
                 req = list_entry(pos, struct ptlrpc_request, rq_set_chain);
@@ -176,13 +174,6 @@ static int ptlrpcd(void *arg)
         return 0;
 }
 
-static void ptlrpcd_zombie_impexp_notify(void)
-{
-        LASSERT(ptlrpcd_pc.pc_set != NULL); // call before ptlrpcd inited ?
-
-        cfs_waitq_signal(&ptlrpcd_pc.pc_set->set_waitq);
-}
-
 #else
 
 int ptlrpcd_check_async_rpcs(void *arg)
@@ -233,9 +224,6 @@ static int ptlrpcd_start(char *name, struct ptlrpcd_ctl *pc)
                 RETURN(-ENOMEM);
 
 #ifdef __KERNEL__
-        /* wake ptlrpcd when zombie imports or exports exist */
-        obd_zombie_impexp_notify = ptlrpcd_zombie_impexp_notify;
-        
         rc = cfs_kernel_thread(ptlrpcd, pc, 0);
         if (rc < 0)  {
                 ptlrpc_set_destroy(pc->pc_set);
@@ -260,7 +248,6 @@ static void ptlrpcd_stop(struct ptlrpcd_ctl *pc)
         set_bit(LIOD_STOP, &pc->pc_flags);
         cfs_waitq_signal(&pc->pc_set->set_waitq);
 #ifdef __KERNEL__
-        obd_zombie_impexp_notify = NULL;
         wait_for_completion(&pc->pc_finishing);
 #else
         liblustre_deregister_wait_callback(pc->pc_wait_callback);