From ad7ea067e2f7f9e7fb533ddf67e9c1f3c70e222f Mon Sep 17 00:00:00 2001
From: Mohit Agrawal <moagrawa@redhat.com>
Date: Thu, 7 Dec 2017 10:32:05 +0530
Subject: [PATCH 105/128] glusterd : Fix glusterd mem leaks

Problem:   glusterd eats a huge amount of meory during volume set/stop/start.

Solution:  At the time of compare graph topology create a graph and populate
           key values in the dictionary, after finished graph comparison we
           do destroy the new graph.At the time of construct graph we don't take
           any reference and for server xlators we do take reference in
           server_setvolume so in glusterd we do take reference after prepare
           a new graph while we do create a graph to compare graph topology.

> BUG: 1520245
> Change-Id: I573133d57771b7dc431a04422c5001a06b7dda9a
> Reviewed on https://review.gluster.org/#/c/18915/
> Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
> (cherry pick from commit e016bcaf8171373cbc327faf42a6b2f2c5449b0e)

BUG: 1512470
Change-Id: Id9aa37146f3ae887f4d06492edad6dedcafc6681
Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/126229
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Tested-by: RHGS Build Bot <nigelb@redhat.com>
---
 xlators/mgmt/glusterd/src/glusterd-handshake.c |  3 +++
 xlators/mgmt/glusterd/src/glusterd-utils.c     | 34 ++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/xlators/mgmt/glusterd/src/glusterd-handshake.c b/xlators/mgmt/glusterd/src/glusterd-handshake.c
index 8dfb528..35aeca3 100644
--- a/xlators/mgmt/glusterd/src/glusterd-handshake.c
+++ b/xlators/mgmt/glusterd/src/glusterd-handshake.c
@@ -1256,6 +1256,9 @@ out:
         if (rsp.hndsk.hndsk_val)
                 GF_FREE (rsp.hndsk.hndsk_val);
 
+        if (args_dict)
+                dict_unref (args_dict);
+
         return ret;
 }
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index 504e5af..1434d64 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -8971,6 +8971,36 @@ glusterd_defrag_volume_status_update (glusterd_volinfo_t *volinfo,
 
         return ret;
 }
+/*
+   The function is required to take dict ref for every xlator at graph.
+   At the time of compare graph topology create a graph and populate
+   key values in the dictionary, after finished graph comparison we do destroy
+   the new graph.At the time of construct graph we don't take any reference
+   so to avoid leak due to ref counter underflow we need to call dict_ref here.
+
+*/
+
+void
+glusterd_graph_take_reference (xlator_t *tree)
+{        xlator_t *trav = tree;
+         xlator_t *prev = tree;
+
+        if (!tree) {
+                gf_msg ("parser", GF_LOG_ERROR, 0, LG_MSG_TREE_NOT_FOUND,
+                        "Translator tree not found");
+                return;
+        }
+
+        while (prev) {
+                trav = prev->next;
+                if (prev->options)
+                        dict_ref (prev->options);
+                prev = trav;
+        }
+        return;
+}
+
+
 
 int
 glusterd_check_topology_identical (const char   *filename1,
@@ -9018,11 +9048,15 @@ glusterd_check_topology_identical (const char   *filename1,
         if (grph1 == NULL)
                 goto out;
 
+        glusterd_graph_take_reference (grph1->first);
+
         /* create the graph for filename2 */
         grph2 = glusterfs_graph_construct(fp2);
         if (grph2 == NULL)
                 goto out;
 
+        glusterd_graph_take_reference (grph2->first);
+
         /* compare the graph topology */
         *identical = is_graph_topology_equal(grph1, grph2);
         ret = 0; /* SUCCESS */
-- 
1.8.3.1