[geo-rep]: Worker still ACTIVE after killing bricks

Problem: In changelog xlator after destroying listener it call's
         unlink to delete changelog socket file but socket file
         reference is not cleaned up from process memory

Solution: 1) To cleanup reference completely from process memory
             serialize transport cleanup for changelog and then
             unlink socket file
          2) Brick xlator will notify GF_EVENT_PARENT_DOWN to next
             xlator only after cleanup all xprts

Test: To test the same run below steps
      1) Setup some volume and enable brick mux
      2) kill anyone brick with gf_attach
      3) check changelog socket for specific to killed brick
         in lsof, it should cleanup completely

fixes: bz#1600145

Change-Id: Iba06cbf77d8a87b34a60fce50f6d8c0d427fa491
Signed-off-by: Mohit Agrawal <moagrawal@redhat.com>

7 files changed, 211 insertions, 40 deletions

diff --git a/xlators/features/changelog/src/changelog-ev-handle.c b/xlators/features/changelog/src/changelog-ev-handle.c
index 3ed6ff821d..f48dd63870 100644
--- a/xlators/features/changelog/src/changelog-ev-handle.c
+++ b/xlators/features/changelog/src/changelog-ev-handle.c
@@ -134,6 +134,8 @@ changelog_rpc_notify(struct rpc_clnt *rpc, void *mydata, rpc_clnt_event_t event,
     changelog_clnt_t *c_clnt = NULL;
     changelog_priv_t *priv = NULL;
     changelog_ev_selector_t *selection = NULL;
+    uint64_t clntcnt = 0;
+    uint64_t xprtcnt = 0;
 
     crpc = mydata;
     this = crpc->this;
@@ -144,6 +146,7 @@ changelog_rpc_notify(struct rpc_clnt *rpc, void *mydata, rpc_clnt_event_t event,
     switch (event) {
         case RPC_CLNT_CONNECT:
             selection = &priv->ev_selection;
+            GF_ATOMIC_INC(priv->clntcnt);
 
             LOCK(&c_clnt->wait_lock);
             {
@@ -176,12 +179,23 @@ changelog_rpc_notify(struct rpc_clnt *rpc, void *mydata, rpc_clnt_event_t event,
                 changelog_set_disconnect_flag(crpc, _gf_true);
             }
             UNLOCK(&crpc->lock);
+            LOCK(&c_clnt->active_lock);
+            {
+                list_del_init(&crpc->list);
+            }
+            UNLOCK(&c_clnt->active_lock);
 
             break;
         case RPC_CLNT_MSG:
         case RPC_CLNT_DESTROY:
             /* Free up mydata */
             changelog_rpc_clnt_unref(crpc);
+            clntcnt = GF_ATOMIC_DEC(priv->clntcnt);
+            xprtcnt = GF_ATOMIC_GET(priv->xprtcnt);
+            if (this->cleanup_starting) {
+                if (!clntcnt && !xprtcnt)
+                    changelog_process_cleanup_event(this);
+            }
             break;
         case RPC_CLNT_PING:
             break;
diff --git a/xlators/features/changelog/src/changelog-ev-handle.h b/xlators/features/changelog/src/changelog-ev-handle.h
index 53119c5e20..cc1af58a27 100644
--- a/xlators/features/changelog/src/changelog-ev-handle.h
+++ b/xlators/features/changelog/src/changelog-ev-handle.h
@@ -131,4 +131,6 @@ changelog_ev_queue_connection(changelog_clnt_t *, changelog_rpc_clnt_t *);
 void
 changelog_ev_cleanup_connections(xlator_t *, changelog_clnt_t *);
 
+void
+changelog_process_cleanup_event(xlator_t *);
 #endif
diff --git a/xlators/features/changelog/src/changelog-helpers.h b/xlators/features/changelog/src/changelog-helpers.h
index 1b8fcb8675..517c4dc488 100644
--- a/xlators/features/changelog/src/changelog-helpers.h
+++ b/xlators/features/changelog/src/changelog-helpers.h
@@ -307,6 +307,24 @@ struct changelog_priv {
 
     /* glusterfind dependency to capture paths on deleted entries*/
     gf_boolean_t capture_del_path;
+
+    /* Save total no. of listners */
+    gf_atomic_t listnercnt;
+
+    /* Save total no. of xprt are associated with listner */
+    gf_atomic_t xprtcnt;
+
+    /* Save xprt list */
+    struct list_head xprt_list;
+
+    /* Save total no. of client connection */
+    gf_atomic_t clntcnt;
+
+    /* Save cleanup brick in victim */
+    xlator_t *victim;
+
+    /* Status to save cleanup notify status */
+    gf_boolean_t notify_down;
 };
 
 struct changelog_local {
diff --git a/xlators/features/changelog/src/changelog-messages.h b/xlators/features/changelog/src/changelog-messages.h
index 9edd9ae60e..ca50ccb149 100644
--- a/xlators/features/changelog/src/changelog-messages.h
+++ b/xlators/features/changelog/src/changelog-messages.h
@@ -52,6 +52,7 @@ GLFS_MSGID(
     CHANGELOG_MSG_FSTAT_OP_FAILED, CHANGELOG_MSG_LSEEK_OP_FAILED,
     CHANGELOG_MSG_STRSTR_OP_FAILED, CHANGELOG_MSG_UNLINK_OP_FAILED,
     CHANGELOG_MSG_DETECT_EMPTY_CHANGELOG_FAILED,
-    CHANGELOG_MSG_READLINK_OP_FAILED, CHANGELOG_MSG_EXPLICIT_ROLLOVER_FAILED);
+    CHANGELOG_MSG_READLINK_OP_FAILED, CHANGELOG_MSG_EXPLICIT_ROLLOVER_FAILED,
+    CHANGELOG_MSG_RPCSVC_NOTIFY_FAILED);
 
 #endif /* !_CHANGELOG_MESSAGES_H_ */
diff --git a/xlators/features/changelog/src/changelog-rpc-common.c b/xlators/features/changelog/src/changelog-rpc-common.c
index 89a5ab30a6..cf35175c3b 100644
--- a/xlators/features/changelog/src/changelog-rpc-common.c
+++ b/xlators/features/changelog/src/changelog-rpc-common.c
@@ -260,6 +260,7 @@ changelog_rpc_server_destroy(xlator_t *this, rpcsvc_t *rpc, char *sockfile,
     rpcsvc_listener_t *listener = NULL;
     rpcsvc_listener_t *next = NULL;
     struct rpcsvc_program *prog = NULL;
+    rpc_transport_t *trans = NULL;
 
     while (*progs) {
         prog = *progs;
@@ -269,22 +270,25 @@ changelog_rpc_server_destroy(xlator_t *this, rpcsvc_t *rpc, char *sockfile,
 
     list_for_each_entry_safe(listener, next, &rpc->listeners, list)
     {
-        rpcsvc_listener_destroy(listener);
+        if (listener->trans) {
+            trans = listener->trans;
+            rpc_transport_disconnect(trans, _gf_false);
+        }
     }
 
     (void)rpcsvc_unregister_notify(rpc, fn, this);
-    sys_unlink(sockfile);
-    if (rpc->rxpool) {
-        mem_pool_destroy(rpc->rxpool);
-        rpc->rxpool = NULL;
-    }
 
     /* TODO Avoid freeing rpc object in case of brick multiplex
        after freeing rpc object svc->rpclock corrupted and it takes
        more time to detach a brick
     */
-    if (!this->cleanup_starting)
+    if (!this->cleanup_starting) {
+        if (rpc->rxpool) {
+            mem_pool_destroy(rpc->rxpool);
+            rpc->rxpool = NULL;
+        }
         GF_FREE(rpc);
+    }
 }
 
 rpcsvc_t *
diff --git a/xlators/features/changelog/src/changelog-rpc.c b/xlators/features/changelog/src/changelog-rpc.c
index 394fae44e3..28974fe099 100644
--- a/xlators/features/changelog/src/changelog-rpc.c
+++ b/xlators/features/changelog/src/changelog-rpc.c
@@ -43,9 +43,6 @@ changelog_cleanup_rpc_threads(xlator_t *this, changelog_priv_t *priv)
     /** terminate dispatcher thread(s) */
     changelog_cleanup_dispatchers(this, priv, priv->nr_dispatchers);
 
-    /* TODO: what about pending and waiting connections? */
-    changelog_ev_cleanup_connections(this, conn);
-
     /* destroy locks */
     ret = pthread_mutex_destroy(&conn->pending_lock);
     if (ret != 0)
@@ -147,48 +144,146 @@ int
 changelog_rpcsvc_notify(rpcsvc_t *rpc, void *xl, rpcsvc_event_t event,
                         void *data)
 {
+    xlator_t *this = NULL;
+    rpc_transport_t *trans = NULL;
+    rpc_transport_t *xprt = NULL;
+    rpc_transport_t *xp_next = NULL;
+    changelog_priv_t *priv = NULL;
+    uint64_t listnercnt = 0;
+    uint64_t xprtcnt = 0;
+    uint64_t clntcnt = 0;
+    rpcsvc_listener_t *listener = NULL;
+    rpcsvc_listener_t *next = NULL;
+    gf_boolean_t listner_found = _gf_false;
+    socket_private_t *sockpriv = NULL;
+
+    if (!xl || !data || !rpc) {
+        gf_msg_callingfn("changelog", GF_LOG_WARNING, 0,
+                         CHANGELOG_MSG_RPCSVC_NOTIFY_FAILED,
+                         "Calling rpc_notify without initializing");
+        goto out;
+    }
+
+    this = xl;
+    trans = data;
+    priv = this->private;
+
+    if (!priv) {
+        gf_msg_callingfn("changelog", GF_LOG_WARNING, 0,
+                         CHANGELOG_MSG_RPCSVC_NOTIFY_FAILED,
+                         "Calling rpc_notify without priv initializing");
+        goto out;
+    }
+
+    if (event == RPCSVC_EVENT_ACCEPT) {
+        GF_ATOMIC_INC(priv->xprtcnt);
+        LOCK(&priv->lock);
+        {
+            list_add_tail(&trans->list, &priv->xprt_list);
+        }
+        UNLOCK(&priv->lock);
+        goto out;
+    }
+
+    if (event == RPCSVC_EVENT_DISCONNECT) {
+        list_for_each_entry_safe(listener, next, &rpc->listeners, list)
+        {
+            if (listener && listener->trans) {
+                if (listener->trans == trans) {
+                    listnercnt = GF_ATOMIC_DEC(priv->listnercnt);
+                    listner_found = _gf_true;
+                    rpcsvc_listener_destroy(listener);
+                }
+            }
+        }
+
+        if (listnercnt > 0) {
+            goto out;
+        }
+        if (listner_found) {
+            LOCK(&priv->lock);
+            list_for_each_entry_safe(xprt, xp_next, &priv->xprt_list, list)
+            {
+                sockpriv = (socket_private_t *)(xprt->private);
+                gf_log("changelog", GF_LOG_INFO,
+                       "Send disconnect"
+                       " on socket %d",
+                       sockpriv->sock);
+                rpc_transport_disconnect(xprt, _gf_false);
+            }
+            UNLOCK(&priv->lock);
+            goto out;
+        }
+        LOCK(&priv->lock);
+        {
+            list_del_init(&trans->list);
+        }
+        UNLOCK(&priv->lock);
+
+        xprtcnt = GF_ATOMIC_DEC(priv->xprtcnt);
+        clntcnt = GF_ATOMIC_GET(priv->clntcnt);
+        if (!xprtcnt && !clntcnt) {
+            changelog_process_cleanup_event(this);
+        }
+    }
+
+out:
     return 0;
 }
 
 void
+changelog_process_cleanup_event(xlator_t *this)
+{
+    gf_boolean_t cleanup_notify = _gf_false;
+    changelog_priv_t *priv = NULL;
+    char sockfile[UNIX_PATH_MAX] = {
+        0,
+    };
+
+    if (!this)
+        return;
+    priv = this->private;
+    if (!priv)
+        return;
+
+    LOCK(&priv->lock);
+    {
+        cleanup_notify = priv->notify_down;
+        priv->notify_down = _gf_true;
+    }
+    UNLOCK(&priv->lock);
+
+    if (priv->victim && !cleanup_notify) {
+        default_notify(this, GF_EVENT_PARENT_DOWN, priv->victim);
+
+        if (priv->rpc) {
+            /* sockfile path could have been saved to avoid this */
+            CHANGELOG_MAKE_SOCKET_PATH(priv->changelog_brick, sockfile,
+                                       UNIX_PATH_MAX);
+            sys_unlink(sockfile);
+            (void)rpcsvc_unregister_notify(priv->rpc, changelog_rpcsvc_notify,
+                                           this);
+            if (priv->rpc->rxpool) {
+                mem_pool_destroy(priv->rpc->rxpool);
+                priv->rpc->rxpool = NULL;
+            }
+            GF_FREE(priv->rpc);
+            priv->rpc = NULL;
+        }
+    }
+}
+
+void
 changelog_destroy_rpc_listner(xlator_t *this, changelog_priv_t *priv)
 {
     char sockfile[UNIX_PATH_MAX] = {
         0,
     };
-    changelog_clnt_t *c_clnt = &priv->connections;
-    changelog_rpc_clnt_t *crpc = NULL;
-    int nofconn = 0;
 
     /* sockfile path could have been saved to avoid this */
     CHANGELOG_MAKE_SOCKET_PATH(priv->changelog_brick, sockfile, UNIX_PATH_MAX);
     changelog_rpc_server_destroy(this, priv->rpc, sockfile,
                                  changelog_rpcsvc_notify, changelog_programs);
-
-    /* TODO Below approach is not perfect to wait for cleanup
-       all active connections without this code brick process
-       can be crash in case of brick multiplexing if any in-progress
-       request process on rpc by changelog xlator after
-       cleanup resources
-    */
-
-    if (c_clnt) {
-        do {
-            nofconn = 0;
-            LOCK(&c_clnt->active_lock);
-            list_for_each_entry(crpc, &c_clnt->active, list) { nofconn++; }
-            UNLOCK(&c_clnt->active_lock);
-            LOCK(&c_clnt->wait_lock);
-            list_for_each_entry(crpc, &c_clnt->waitq, list) { nofconn++; }
-            UNLOCK(&c_clnt->wait_lock);
-            pthread_mutex_lock(&c_clnt->pending_lock);
-            list_for_each_entry(crpc, &c_clnt->pending, list) { nofconn++; }
-            pthread_mutex_unlock(&c_clnt->pending_lock);
-
-        } while (nofconn); /* Wait for all connection cleanup */
-    }
-
-    (void)changelog_cleanup_rpc_threads(this, priv);
 }
 
 rpcsvc_t *
diff --git a/xlators/features/changelog/src/changelog.c b/xlators/features/changelog/src/changelog.c
index 1f42dbe178..1f22a97a6e 100644
--- a/xlators/features/changelog/src/changelog.c
+++ b/xlators/features/changelog/src/changelog.c
@@ -2004,6 +2004,10 @@ notify(xlator_t *this, int event, void *data, ...)
     struct list_head queue = {
         0,
     };
+    uint64_t xprtcnt = 0;
+    uint64_t clntcnt = 0;
+    changelog_clnt_t *conn = NULL;
+    gf_boolean_t cleanup_notify = _gf_false;
 
     INIT_LIST_HEAD(&queue);
 
@@ -2011,6 +2015,33 @@ notify(xlator_t *this, int event, void *data, ...)
     if (!priv)
         goto out;
 
+    if (event == GF_EVENT_PARENT_DOWN) {
+        priv->victim = data;
+        gf_log(this->name, GF_LOG_INFO,
+               "cleanup changelog rpc connection of brick %s",
+               priv->victim->name);
+
+        this->cleanup_starting = 1;
+        changelog_destroy_rpc_listner(this, priv);
+        conn = &priv->connections;
+        if (conn)
+            changelog_ev_cleanup_connections(this, conn);
+        xprtcnt = GF_ATOMIC_GET(priv->xprtcnt);
+        clntcnt = GF_ATOMIC_GET(priv->clntcnt);
+
+        if (!xprtcnt && !clntcnt) {
+            LOCK(&priv->lock);
+            {
+                cleanup_notify = priv->notify_down;
+                priv->notify_down = _gf_true;
+            }
+            UNLOCK(&priv->lock);
+            if (!cleanup_notify)
+                default_notify(this, GF_EVENT_PARENT_DOWN, data);
+        }
+        goto out;
+    }
+
     if (event == GF_EVENT_TRANSLATOR_OP) {
         dict = data;
 
@@ -2629,8 +2660,10 @@ static void
 changelog_cleanup_rpc(xlator_t *this, changelog_priv_t *priv)
 {
     /* terminate rpc server */
-    changelog_destroy_rpc_listner(this, priv);
+    if (!this->cleanup_starting)
+        changelog_destroy_rpc_listner(this, priv);
 
+    (void)changelog_cleanup_rpc_threads(this, priv);
     /* cleanup rot buffs */
     rbuf_dtor(priv->rbuf);
 
@@ -2703,6 +2736,10 @@ init(xlator_t *this)
 
     LOCK_INIT(&priv->lock);
     LOCK_INIT(&priv->c_snap_lock);
+    GF_ATOMIC_INIT(priv->listnercnt, 0);
+    GF_ATOMIC_INIT(priv->clntcnt, 0);
+    GF_ATOMIC_INIT(priv->xprtcnt, 0);
+    INIT_LIST_HEAD(&priv->xprt_list);
 
     ret = changelog_init_options(this, priv);
     if (ret)