feature/geo-rep: Fix to retain pause state of gsyncd on restart.

A new gsyncd options '--pause-on-start' is introduced. When node
reboots, if the status is paused, gsyncd is started with this
option. After gsyncd spawns worker and agent, worker will send 
SIGSTOP to negative pid of monitor to enter pause mode.

Change-Id: I5aad82c9a9fc8c243f384940b77d25e26e520d6d
BUG: 1101410
Signed-off-by: Kotresh H R <khiremat@redhat.com>
Reviewed-on: http://review.gluster.org/7885
Reviewed-by: Aravinda VK <avishwan@redhat.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Venky Shankar <vshankar@redhat.com>

3 files changed, 17 insertions, 9 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-geo-rep.c b/xlators/mgmt/glusterd/src/glusterd-geo-rep.c
index 3e2e308ec13..aa3cc99fbff 100644
--- a/xlators/mgmt/glusterd/src/glusterd-geo-rep.c
+++ b/xlators/mgmt/glusterd/src/glusterd-geo-rep.c
@@ -3724,7 +3724,7 @@ glusterd_check_restart_gsync_session (glusterd_volinfo_t *volinfo, char *slave,
         if (ret == 0)
                 ret = glusterd_start_gsync (volinfo, slave, path_list,
                                             conf_path, uuid_utoa(MY_UUID),
-                                            NULL);
+                                            NULL, _gf_false);
 
  out:
         gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
@@ -4499,7 +4499,8 @@ glusterd_op_gsync_set (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
                 }
 
                 ret = glusterd_start_gsync (volinfo, slave, path_list,
-                                            conf_path, host_uuid, op_errstr);
+                                            conf_path, host_uuid, op_errstr,
+                                            _gf_false);
         }
 
         if (type == GF_GSYNC_OPTION_TYPE_STOP ||
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index a2a746d247e..15e91ad24dd 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -6572,6 +6572,7 @@ _local_gsyncd_start (dict_t *this, char *key, data_t *value, void *data)
         char               *op_errstr                   = NULL;
         glusterd_conf_t    *priv                        = NULL;
         gf_boolean_t        is_template_in_use          = _gf_false;
+        gf_boolean_t        is_paused                    = _gf_false;
 
         GF_ASSERT (THIS);
         priv = THIS->private;
@@ -6665,9 +6666,9 @@ _local_gsyncd_start (dict_t *this, char *key, data_t *value, void *data)
                         "%s and %s::%s. Not Restarting", volinfo->volname,
                         slave_ip, slave_vol);
                 goto out;
-        }
-
-        if ((!strcmp (buf, "Config Corrupted"))) {
+        } else if (strstr(buf, "Paused")) {
+                is_paused = _gf_true;
+        } else if ((!strcmp (buf, "Config Corrupted"))) {
                 gf_log ("", GF_LOG_INFO,
                         "Recovering from a corrupted config. "
                         "Not Restarting. Use start (force) to "
@@ -6677,8 +6678,12 @@ _local_gsyncd_start (dict_t *this, char *key, data_t *value, void *data)
                 goto out;
         }
 
-        glusterd_start_gsync (volinfo, slave, path_list, confpath,
-                              uuid_str, NULL);
+        if (is_paused)
+                glusterd_start_gsync (volinfo, slave, path_list, confpath,
+                                      uuid_str, NULL, _gf_true);
+        else
+                glusterd_start_gsync (volinfo, slave, path_list, confpath,
+                                      uuid_str, NULL, _gf_false);
 
 out:
         if (statefile)
@@ -8294,7 +8299,7 @@ int
 glusterd_start_gsync (glusterd_volinfo_t *master_vol, char *slave,
                       char *path_list, char *conf_path,
                       char *glusterd_uuid_str,
-                      char **op_errstr)
+                      char **op_errstr, gf_boolean_t is_pause)
 {
         int32_t         ret     = 0;
         int32_t         status  = 0;
@@ -8356,6 +8361,8 @@ glusterd_start_gsync (glusterd_volinfo_t *master_vol, char *slave,
         runner_argprintf (&runner, "--glusterd-uuid=%s",
                           uuid_utoa (priv->uuid));
         runner_add_arg   (&runner, slave);
+        if (is_pause)
+                runner_add_arg   (&runner, "--pause-on-start");
         synclock_unlock (&priv->big_lock);
         ret = runner_run (&runner);
         synclock_lock (&priv->big_lock);
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.h b/xlators/mgmt/glusterd/src/glusterd-utils.h
index 4b6e2b0cdbc..834d4a52156 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.h
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.h
@@ -413,7 +413,7 @@ int
 glusterd_start_gsync (glusterd_volinfo_t *master_vol, char *slave,
                       char *path_list, char *conf_path,
                       char *glusterd_uuid_str,
-                      char **op_errstr);
+                      char **op_errstr, gf_boolean_t is_pause);
 int
 glusterd_get_local_brickpaths (glusterd_volinfo_t *volinfo,
                                char **pathlist);