nfs/nlm: free the nlm_client upon RPC_DISCONNECT

When an NLM client disconnects, it should be removed from the list and
free'd.

> Cherry picked from commit 6897ba5c51b29c05b270c447adb1a34cb8e61911:
> Change-Id: Ib427c896bfcdc547a3aee42a652578ffd076e2ad
> BUG: 1381970
> Signed-off-by: Niels de Vos <ndevos@redhat.com>
> Reviewed-on: https://review.gluster.org/17189
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: jiffin tony Thottan <jthottan@redhat.com>

Change-Id: Ib427c896bfcdc547a3aee42a652578ffd076e2ad
BUG: 1450380
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: https://review.gluster.org/17277
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: jiffin tony Thottan <jthottan@redhat.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>

1 files changed, 20 insertions, 12 deletions

diff --git a/xlators/nfs/server/src/nlm4.c b/xlators/nfs/server/src/nlm4.c
index 903262eff54..cff9a3f5044 100644
--- a/xlators/nfs/server/src/nlm4.c
+++ b/xlators/nfs/server/src/nlm4.c
@@ -45,7 +45,7 @@
 
 /* TODO:
  * 1) 2 opens racing .. creating an fd leak.
- * 2) use mempool for nlmclnt - destroy if no fd exists, create during 1st call
+ * 2) use GF_REF_* for nlm_clnt_t
  */
 
 typedef ssize_t (*nlm4_serializer) (struct iovec outmsg, void *args);
@@ -333,6 +333,24 @@ ret:
         return rpc_clnt;
 }
 
+static void
+nlm_client_free (nlm_client_t *nlmclnt)
+{
+        list_del (&nlmclnt->fdes);
+        list_del (&nlmclnt->nlm_clients);
+        list_del (&nlmclnt->shares);
+
+        GF_FREE (nlmclnt->caller_name);
+
+        if (nlmclnt->rpc_clnt) {
+                /* cleanup the saved-frames before last unref */
+                rpc_clnt_connection_cleanup (&nlmclnt->rpc_clnt->conn);
+                /* rpc_clnt_connection_cleanup() calls rpc_clnt_unref() */
+        }
+
+        GF_FREE (nlmclnt);
+}
+
 int
 nlm_set_rpc_clnt (rpc_clnt_t *rpc_clnt, char *caller_name)
 {
@@ -375,26 +393,16 @@ int
 nlm_unset_rpc_clnt (rpc_clnt_t *rpc)
 {
         nlm_client_t *nlmclnt = NULL;
-        rpc_clnt_t *rpc_clnt = NULL;
 
         LOCK (&nlm_client_list_lk);
         list_for_each_entry (nlmclnt, &nlm_client_list, nlm_clients) {
                 if (rpc == nlmclnt->rpc_clnt) {
-                        rpc_clnt = nlmclnt->rpc_clnt;
-                        nlmclnt->rpc_clnt = NULL;
+                        nlm_client_free (nlmclnt);
                         break;
                 }
         }
         UNLOCK (&nlm_client_list_lk);
-        if (rpc_clnt == NULL) {
-                return -1;
-        }
-        if (rpc_clnt) {
-                /* cleanup the saved-frames before last unref */
-                rpc_clnt_connection_cleanup (&rpc_clnt->conn);
 
-                rpc_clnt_unref (rpc_clnt);
-        }
         return 0;
 }