core[brick_mux]: brick crashed when creating and deleting volumes over time

Problem: In brick_mux environment, while volumes are created/stopped in a loop
         after running a long time the main brick is crashed.The brick is crashed
         because the main brick process was not cleaned up memory for all objects
         at the time of detaching a volume.
         Below are the objects that are missed at the time of detaching a volume
         1) xlator object for a brick graph
         2) local_pool for posix_lock xlator
         3) rpc object cleanup at quota xlator
         4) inode leak at brick xlator

Solution: To avoid the crash resolve all leak at the time of detaching a brick
Change-Id: Ibb6e46c5fba22b9441a88cbaf6b3278823235913
updates: #977
Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>

3 files changed, 65 insertions, 6 deletions

diff --git a/xlators/features/quota/src/quota-enforcer-client.c b/xlators/features/quota/src/quota-enforcer-client.c
index 1a4c2e30dd6..097439d86d6 100644
--- a/xlators/features/quota/src/quota-enforcer-client.c
+++ b/xlators/features/quota/src/quota-enforcer-client.c
@@ -362,16 +362,28 @@ quota_enforcer_notify(struct rpc_clnt *rpc, void *mydata,
 {
     xlator_t *this = NULL;
     int ret = 0;
+    quota_priv_t *priv = NULL;
 
     this = mydata;
-
+    priv = this->private;
     switch (event) {
         case RPC_CLNT_CONNECT: {
+            pthread_mutex_lock(&priv->conn_mutex);
+            {
+                priv->conn_status = _gf_true;
+            }
+            pthread_mutex_unlock(&priv->conn_mutex);
             gf_msg_trace(this->name, 0, "got RPC_CLNT_CONNECT");
             break;
         }
 
         case RPC_CLNT_DISCONNECT: {
+            pthread_mutex_lock(&priv->conn_mutex);
+            {
+                priv->conn_status = _gf_false;
+                pthread_cond_signal(&priv->conn_cond);
+            }
+            pthread_mutex_unlock(&priv->conn_mutex);
             gf_msg_trace(this->name, 0, "got RPC_CLNT_DISCONNECT");
             break;
         }
diff --git a/xlators/features/quota/src/quota.c b/xlators/features/quota/src/quota.c
index 01b01b5f01b..73c008a2c00 100644
--- a/xlators/features/quota/src/quota.c
+++ b/xlators/features/quota/src/quota.c
@@ -5008,6 +5008,43 @@ quota_forget(xlator_t *this, inode_t *inode)
     return 0;
 }
 
+int
+notify(xlator_t *this, int event, void *data, ...)
+{
+    quota_priv_t *priv = NULL;
+    int ret = 0;
+    rpc_clnt_t *rpc = NULL;
+    gf_boolean_t conn_status = _gf_true;
+    xlator_t *victim = data;
+
+    priv = this->private;
+    if (!priv || !priv->is_quota_on)
+        goto out;
+
+    if (event == GF_EVENT_PARENT_DOWN) {
+        rpc = priv->rpc_clnt;
+        if (rpc) {
+            rpc_clnt_disable(rpc);
+            pthread_mutex_lock(&priv->conn_mutex);
+            {
+                conn_status = priv->conn_status;
+                while (conn_status) {
+                    (void)pthread_cond_wait(&priv->conn_cond,
+                                            &priv->conn_mutex);
+                    conn_status = priv->conn_status;
+                }
+            }
+            pthread_mutex_unlock(&priv->conn_mutex);
+            gf_log(this->name, GF_LOG_INFO,
+                   "Notify GF_EVENT_PARENT_DOWN for brick %s", victim->name);
+        }
+    }
+
+out:
+    ret = default_notify(this, event, data);
+    return ret;
+}
+
 int32_t
 init(xlator_t *this)
 {
@@ -5050,6 +5087,10 @@ init(xlator_t *this)
         goto err;
     }
 
+    pthread_mutex_init(&priv->conn_mutex, NULL);
+    pthread_cond_init(&priv->conn_cond, NULL);
+    priv->conn_status = _gf_false;
+
     if (priv->is_quota_on) {
         rpc = quota_enforcer_init(this, this->options);
         if (rpc == NULL) {
@@ -5163,20 +5204,22 @@ fini(xlator_t *this)
 {
     quota_priv_t *priv = NULL;
     rpc_clnt_t *rpc = NULL;
-    int i = 0, cnt = 0;
 
     priv = this->private;
     if (!priv)
         return;
     rpc = priv->rpc_clnt;
     priv->rpc_clnt = NULL;
-    this->private = NULL;
     if (rpc) {
-        cnt = GF_ATOMIC_GET(rpc->refcount);
-        for (i = 0; i < cnt; i++)
-            rpc_clnt_unref(rpc);
+        rpc_clnt_connection_cleanup(&rpc->conn);
+        rpc_clnt_unref(rpc);
     }
+
+    this->private = NULL;
     LOCK_DESTROY(&priv->lock);
+    pthread_mutex_destroy(&priv->conn_mutex);
+    pthread_cond_destroy(&priv->conn_cond);
+
     GF_FREE(priv);
     if (this->local_pool) {
         mem_pool_destroy(this->local_pool);
@@ -5308,6 +5351,7 @@ struct volume_options options[] = {
 xlator_api_t xlator_api = {
     .init = init,
     .fini = fini,
+    .notify = notify,
     .reconfigure = reconfigure,
     .mem_acct_init = mem_acct_init,
     .op_version = {1}, /* Present from the initial version */
diff --git a/xlators/features/quota/src/quota.h b/xlators/features/quota/src/quota.h
index 00012c22f46..8a3dc7a77f5 100644
--- a/xlators/features/quota/src/quota.h
+++ b/xlators/features/quota/src/quota.h
@@ -214,6 +214,9 @@ struct quota_priv {
     char *volume_uuid;
     uint64_t validation_count;
     int32_t quotad_conn_status;
+    pthread_mutex_t conn_mutex;
+    pthread_cond_t conn_cond;
+    gf_boolean_t conn_status;
 };
 typedef struct quota_priv quota_priv_t;