glusterfsd: Multiple shd processes are spawned on brick_mux environment

Problem: Multiple shd processes are spawned while starting volumes
         in the loop on brick_mux environment.glusterd spawn a process
         based on a pidfile and shd daemon is taking some time to
         update pid in pidfile due to that glusterd is not able to
         get shd pid

Solution: Commit cd249f4cb783f8d79e79468c455732669e835a4f changed
          the code to update pidfile in parent for any gluster daemon
          after getting the status of forking child in parent.To resolve
          the same correct the condition update pidfile in parent only
          for glusterd and for rest of the daemon pidfile is updated in
          child

> Change-Id: Ifd14797fa949562594a285ec82d58384ad717e81
> fixes: bz#1684404
> Signed-off-by: Mohit Agrawal <moagrawal@redhat.com>
> (Cherry picked from commit 66986594a9023c49e61b32769b7e6b260b600626)
> (Reviewed on upstream link https://review.gluster.org/#/c/glusterfs/+/22290/)

Change-Id: Ie295e905c01f2749bc39da5511537cc9a85832e5
fixes: bz#1696513
Signed-off-by: Mohit Agrawal <moagrawal@redhat.com>

2 files changed, 18 insertions, 9 deletions

diff --git a/glusterfsd/src/glusterfsd.c b/glusterfsd/src/glusterfsd.c
index f589ce69ecd..dfc3e14beaf 100644
--- a/glusterfsd/src/glusterfsd.c
+++ b/glusterfsd/src/glusterfsd.c
@@ -2438,9 +2438,6 @@ daemonize (glusterfs_ctx_t *ctx)
                 goto out;
 
         if (cmd_args->no_daemon_mode) {
-                ret = glusterfs_pidfile_update (ctx, getpid());
-                if (ret)
-                        goto out;
                 goto postfork;
         }
 
@@ -2496,13 +2493,26 @@ daemonize (glusterfs_ctx_t *ctx)
                    will be available to parent process on calling exit() */
                 if (err)
                         _exit (abs(err));
-                ret = glusterfs_pidfile_update (ctx, child_pid);
-                if (ret)
-                        _exit (1);
+
+                /* Update pid in parent only for glusterd process */
+                if (ctx->process_mode == GF_GLUSTERD_PROCESS) {
+                        ret = glusterfs_pidfile_update(ctx, child_pid);
+                        if (ret)
+                                exit(1);
+                }
                 _exit (0);
         }
 
 postfork:
+        /* Update pid in child either process_mode is not belong to glusterd
+           or process is spawned in no daemon mode
+        */
+        if ((ctx->process_mode != GF_GLUSTERD_PROCESS) ||
+            (cmd_args->no_daemon_mode)) {
+                ret = glusterfs_pidfile_update(ctx, getpid());
+                if (ret)
+                        goto out;
+        }
         ret = gf_log_inject_timer_event (ctx);
 
         glusterfs_signals_setup (ctx);
diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index e2874602a84..8408bfe5eca 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -4000,15 +4000,14 @@ gf_is_service_running (char *pidfile, int *pid)
         ret = lockf (fno, F_TEST, 0);
         if (ret == -1)
                 running = _gf_true;
-        if (!pid) {
-                goto out;
-        }
 
         ret = fscanf (file, "%d", pid);
         if (ret <= 0) {
                 gf_msg ("", GF_LOG_ERROR, errno, LG_MSG_FILE_OP_FAILED,
                         "Unable to read pidfile: %s", pidfile);
                 *pid = -1;
+                running = _gf_false;
+                goto out;
         }
 
         running = gf_is_pid_running (*pid);