mgmt/shd: Implement multiplexing in self heal daemon

Problem:

Shd daemon is per node, which means they create a graph
with all volumes on it. While this is a great for utilizing
resources, it is so good in terms of performance and managebility.

Because self-heal daemons doesn't have capability to automatically
reconfigure their graphs. So each time when any configurations
changes happens to the volumes(replicate/disperse), we need to restart
shd to bring the changes into the graph.

Because of this all on going heal for all other volumes has to be
stopped in the middle, and need to restart all over again.

Solution:

This changes makes shd as a per volume daemon, so that the graph
will be generated for each volumes.

When we want to start/reconfigure shd for a volume, we first search
for an existing shd running on the node, if there is none, we will
start a new process. If already a daemon is running for shd, then
we will simply detach a graph for a volume and reatach the updated
graph for the volume. This won't touch any of the on going operations
for any other volumes on the shd daemon.

Example of an shd graph when it is per volume

                           graph
                     -----------------------
                     |     debug-iostat    |
                     -----------------------
                    /         |             \
                   /          |              \
              ---------    ---------      ----------
              | AFR-1 |    | AFR-2 |      |  AFR-3 |
              --------     ---------      ----------

A running shd daemon with 3 volumes will be like-->

                           graph
                     -----------------------
                     |     debug-iostat    |
                     -----------------------
                    /           |           \
                   /            |            \
              ------------   ------------  ------------
              | volume-1 |   | volume-2 |  | volume-3 |
              ------------   ------------  ------------

Change-Id: Idcb2698be3eeb95beaac47125565c93370afbd99
fixes: bz#1659708
Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-svc-mgmt.h b/xlators/mgmt/glusterd/src/glusterd-svc-mgmt.h
index c850bfda68f..fbc522549e0 100644
--- a/xlators/mgmt/glusterd/src/glusterd-svc-mgmt.h
+++ b/xlators/mgmt/glusterd/src/glusterd-svc-mgmt.h
@@ -13,9 +13,12 @@
 
 #include "glusterd-proc-mgmt.h"
 #include "glusterd-conn-mgmt.h"
+#include "glusterd-rcu.h"
 
 struct glusterd_svc_;
+
 typedef struct glusterd_svc_ glusterd_svc_t;
+typedef struct glusterd_svc_proc_ glusterd_svc_proc_t;
 
 typedef void (*glusterd_svc_build_t)(glusterd_svc_t *svc);
 
@@ -25,6 +28,17 @@ typedef int (*glusterd_svc_start_t)(glusterd_svc_t *svc, int flags);
 typedef int (*glusterd_svc_stop_t)(glusterd_svc_t *svc, int sig);
 typedef int (*glusterd_svc_reconfigure_t)(void *data);
 
+typedef int (*glusterd_muxsvc_conn_notify_t)(glusterd_svc_proc_t *mux_proc,
+                                             rpc_clnt_event_t event);
+
+struct glusterd_svc_proc_ {
+    struct cds_list_head svc_proc_list;
+    struct cds_list_head svcs;
+    glusterd_muxsvc_conn_notify_t notify;
+    rpc_clnt_t *rpc;
+    void *data;
+};
+
 struct glusterd_svc_ {
     char name[NAME_MAX];
     glusterd_conn_t conn;
@@ -35,6 +49,8 @@ struct glusterd_svc_ {
     gf_boolean_t online;
     gf_boolean_t inited;
     glusterd_svc_reconfigure_t reconfigure;
+    glusterd_svc_proc_t *svc_proc;
+    struct cds_list_head mux_svc;
 };
 
 int
@@ -69,4 +85,15 @@ glusterd_svc_reconfigure(int (*create_volfile)());
 int
 glusterd_svc_common_rpc_notify(glusterd_conn_t *conn, rpc_clnt_event_t event);
 
+int
+glusterd_muxsvc_common_rpc_notify(glusterd_svc_proc_t *conn,
+                                  rpc_clnt_event_t event);
+
+int
+glusterd_proc_get_pid(glusterd_proc_t *proc);
+
+int
+glusterd_muxsvc_conn_init(glusterd_conn_t *conn, glusterd_svc_proc_t *mux_proc,
+                          char *sockpath, int frame_timeout,
+                          glusterd_muxsvc_conn_notify_t notify);
 #endif