glusterd: socketfile & pidfile related fixes for brick multiplexing feature

Problem: While brick-muliplexing is on after restarting glusterd, CLI is
         not showing pid of all brick processes in all volumes.

Solution: While brick-mux is on all local brick process communicated through one
          UNIX socket but as per current code (glusterd_brick_start) it is trying
          to communicate with separate UNIX socket for each volume which is populated
          based on brick-name and vol-name.Because of multiplexing design only one
          UNIX socket is opened so it is throwing poller error and not able to
          fetch correct status of brick process through cli process.
          To resolve the problem write a new function glusterd_set_socket_filepath_for_mux
          that will call by glusterd_brick_start to validate about the existence of socketpath.
          To avoid the continuous EPOLLERR erros in  logs update socket_connect code.

Test:     To reproduce the issue followed below steps
          1) Create two distributed volumes(dist1 and dist2)
          2) Set cluster.brick-multiplex is on
          3) kill glusterd
          4) run command gluster v status
          After apply the patch it shows correct pid for all volumes

> BUG: 1444596
> Change-Id: I5d10af69dea0d0ca19511f43870f34295a54a4d2
> Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
> Reviewed-on: https://review.gluster.org/17101
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Prashanth Pai <ppai@redhat.com>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
> (cherry picked from commit 21c7f7baccfaf644805e63682e5a7d2a9864a1e6)

Change-Id: Ia95b9d36e50566b293a8d6350f8316dafc27033b
BUG: 1449004
Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
Reviewed-on: https://review.gluster.org/17212
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-by: Prashanth Pai <ppai@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>

8 files changed, 141 insertions, 41 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-brick-ops.c b/xlators/mgmt/glusterd/src/glusterd-brick-ops.c
index 0a7e7581cd5..b1b13a49f71 100644
--- a/xlators/mgmt/glusterd/src/glusterd-brick-ops.c
+++ b/xlators/mgmt/glusterd/src/glusterd-brick-ops.c
@@ -1960,6 +1960,7 @@ glusterd_remove_brick_validate_bricks (gf1_op_commands cmd, int32_t brick_count,
         int                     ret         = -1;
         char                    pidfile[PATH_MAX+1] = {0,};
         glusterd_conf_t        *priv        = THIS->private;
+        int                     pid         = -1;
 
         /* Check whether all the nodes of the bricks to be removed are
         * up, if not fail the operation */
@@ -2048,12 +2049,14 @@ check:
                         }
                         GLUSTERD_GET_BRICK_PIDFILE (pidfile, volinfo,
                                                     brickinfo, priv);
-                        if (!gf_is_service_running (pidfile, NULL)) {
+                        if (!gf_is_service_running (pidfile, &pid)) {
                                 snprintf (msg, sizeof (msg), "Found dead "
                                           "brick %s", brick);
                                 *errstr = gf_strdup (msg);
                                 ret = -1;
                                 goto out;
+                        } else {
+                                ret = 0;
                         }
                         continue;
                 }
diff --git a/xlators/mgmt/glusterd/src/glusterd-proc-mgmt.c b/xlators/mgmt/glusterd/src/glusterd-proc-mgmt.c
index 9f934629330..8eeec403139 100644
--- a/xlators/mgmt/glusterd/src/glusterd-proc-mgmt.c
+++ b/xlators/mgmt/glusterd/src/glusterd-proc-mgmt.c
@@ -105,7 +105,7 @@ glusterd_proc_stop (glusterd_proc_t *proc, int sig, int flags)
                 goto out;
 
         sleep (1);
-        if (gf_is_service_running (proc->pidfile, NULL)) {
+        if (gf_is_service_running (proc->pidfile, &pid)) {
                 ret = kill (pid, SIGKILL);
                 if (ret) {
                         gf_msg (this->name, GF_LOG_ERROR, errno,
@@ -131,5 +131,7 @@ glusterd_proc_get_pid (glusterd_proc_t *proc)
 int
 glusterd_proc_is_running (glusterd_proc_t *proc)
 {
-        return gf_is_service_running (proc->pidfile, NULL);
+        int pid = -1;
+
+        return gf_is_service_running (proc->pidfile, &pid);
 }
diff --git a/xlators/mgmt/glusterd/src/glusterd-rebalance.c b/xlators/mgmt/glusterd/src/glusterd-rebalance.c
index 22c18b96033..fbef1df7eaa 100644
--- a/xlators/mgmt/glusterd/src/glusterd-rebalance.c
+++ b/xlators/mgmt/glusterd/src/glusterd-rebalance.c
@@ -84,6 +84,7 @@ __glusterd_defrag_notify (struct rpc_clnt *rpc, void *mydata,
         char                    pidfile[PATH_MAX];
         glusterd_conf_t        *priv    = NULL;
         xlator_t               *this    = NULL;
+        int                    pid      = -1;
 
         this = THIS;
         if (!this)
@@ -134,7 +135,7 @@ __glusterd_defrag_notify (struct rpc_clnt *rpc, void *mydata,
                 }
                 UNLOCK (&defrag->lock);
 
-                if (!gf_is_service_running (pidfile, NULL)) {
+                if (!gf_is_service_running (pidfile, &pid)) {
                         if (volinfo->rebal.defrag_status ==
                                                 GF_DEFRAG_STATUS_STARTED) {
                                 volinfo->rebal.defrag_status =
diff --git a/xlators/mgmt/glusterd/src/glusterd-store.c b/xlators/mgmt/glusterd/src/glusterd-store.c
index 740354304c5..72b70f916c6 100644
--- a/xlators/mgmt/glusterd/src/glusterd-store.c
+++ b/xlators/mgmt/glusterd/src/glusterd-store.c
@@ -4584,6 +4584,10 @@ glusterd_restore ()
 
         this = THIS;
 
+	ret = glusterd_options_init (this);
+        if (ret < 0)
+                goto out;
+
         ret = glusterd_store_retrieve_volumes (this, NULL);
         if (ret)
                 goto out;
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index e00d9a12fa5..27af1b79851 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -1614,7 +1614,7 @@ glusterd_service_stop (const char *service, char *pidfile, int sig,
                 goto out;
 
         sleep (1);
-        if (gf_is_service_running (pidfile, NULL)) {
+        if (gf_is_service_running (pidfile, &pid)) {
                 ret = kill (pid, SIGKILL);
                 if (ret) {
                         gf_msg (this->name, GF_LOG_ERROR, errno,
@@ -1715,6 +1715,8 @@ glusterd_set_brick_socket_filepath (glusterd_volinfo_t *volinfo,
         xlator_t                *this = NULL;
         glusterd_conf_t         *priv = NULL;
         int                     expected_file_len = 0;
+        char                    export_path[PATH_MAX] = {0,};
+        char                    sock_filepath[PATH_MAX] = {0,};
 
         expected_file_len = strlen (GLUSTERD_SOCK_DIR) + strlen ("/") +
                             MD5_DIGEST_LENGTH*2 + strlen (".socket") + 1;
@@ -1725,18 +1727,10 @@ glusterd_set_brick_socket_filepath (glusterd_volinfo_t *volinfo,
         priv = this->private;
 
         GLUSTERD_GET_VOLUME_DIR (volume_dir, volinfo, priv);
-        if (is_brick_mx_enabled ()) {
-                snprintf (sockpath, len, "%s/run/daemon-%s.socket",
-                          volume_dir, brickinfo->hostname);
-        } else {
-                char                    export_path[PATH_MAX] = {0,};
-                char                    sock_filepath[PATH_MAX] = {0,};
-                GLUSTERD_REMOVE_SLASH_FROM_PATH (brickinfo->path, export_path);
-                snprintf (sock_filepath, PATH_MAX, "%s/run/%s-%s",
-                          volume_dir, brickinfo->hostname, export_path);
-
-                glusterd_set_socket_filepath (sock_filepath, sockpath, len);
-        }
+        GLUSTERD_REMOVE_SLASH_FROM_PATH (brickinfo->path, export_path);
+        snprintf (sock_filepath, PATH_MAX, "%s/run/%s-%s",
+                  volume_dir, brickinfo->hostname, export_path);
+        glusterd_set_socket_filepath (sock_filepath, sockpath, len);
 }
 
 /* connection happens only if it is not aleady connected,
@@ -1830,6 +1824,7 @@ glusterd_volume_start_glusterfs (glusterd_volinfo_t  *volinfo,
         char                    rdma_brick_path[PATH_MAX] = {0,};
         struct rpc_clnt         *rpc = NULL;
         rpc_clnt_connection_t   *conn  = NULL;
+        int                     pid    = -1;
 
         GF_ASSERT (volinfo);
         GF_ASSERT (brickinfo);
@@ -1852,7 +1847,7 @@ glusterd_volume_start_glusterfs (glusterd_volinfo_t  *volinfo,
         }
 
         GLUSTERD_GET_BRICK_PIDFILE (pidfile, volinfo, brickinfo, priv);
-        if (gf_is_service_running (pidfile, NULL)) {
+        if (gf_is_service_running (pidfile, &pid)) {
                 goto connect;
         }
 
@@ -5044,8 +5039,6 @@ attach_brick (xlator_t *this,
 
         GLUSTERD_GET_BRICK_PIDFILE (pidfile1, other_vol, other_brick, conf);
         GLUSTERD_GET_BRICK_PIDFILE (pidfile2, volinfo, brickinfo, conf);
-        (void) sys_unlink (pidfile2);
-        (void) sys_link (pidfile1, pidfile2);
 
         if (volinfo->is_snap_volume) {
                 snprintf (full_id, sizeof(full_id), "/%s/%s/%s.%s.%s",
@@ -5065,6 +5058,10 @@ attach_brick (xlator_t *this,
                                                GLUSTERD_BRICK_ATTACH);
                         rpc_clnt_unref (rpc);
                         if (!ret) {
+                                /* PID file is copied once brick has attached
+                                  successfully
+                                */
+                                glusterd_copy_file (pidfile1, pidfile2);
                                 return 0;
                         }
                 }
@@ -5284,6 +5281,80 @@ find_compatible_brick (glusterd_conf_t *conf,
         return NULL;
 }
 
+/* Below function is use to populate sockpath based on passed pid
+   value as a argument after check the value from proc
+*/
+
+void
+glusterd_get_sock_from_brick_pid (int pid, char *sockpath, size_t len)
+{
+        char fname[128] = {0,};
+        char buf[1024] = {0,};
+        char cmdline[2048] = {0,};
+        xlator_t                *this = NULL;
+        int fd         = -1;
+        int i = 0, j = 0;
+        char   *ptr   = NULL;
+        char   *brptr   = NULL;
+        char tmpsockpath[PATH_MAX] = {0,};
+        size_t blen    = 0;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        snprintf(fname, sizeof(fname), "/proc/%d/cmdline", pid);
+
+        if (sys_access (fname , R_OK) != 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                         "brick process %d is not running", pid);
+                return;
+        }
+
+        fd = open(fname, O_RDONLY);
+        if (fd != -1) {
+                blen = (int)sys_read(fd, buf, 1024);
+        } else {
+                gf_log (this->name, GF_LOG_ERROR,
+                         "open failed %s to open a file %s", strerror (errno),
+                                                              fname);
+                return;
+        }
+
+        /* convert cmdline to single string */
+        for (i = 0 , j = 0; i < blen; i++)  {
+                if (buf[i] == '\0')
+                        cmdline[j++] = ' ';
+                else if (buf[i] < 32 || buf[i] > 126) /* remove control char */
+                        continue;
+                else if (buf[i] == '"' || buf[i] == '\\') {
+                        cmdline[j++] = '\\';
+                        cmdline[j++] = buf[i];
+                } else {
+                        cmdline[j++] = buf[i];
+                }
+        }
+        cmdline[j] = '\0';
+        if (fd)
+                sys_close(fd);
+
+        ptr =   strstr(cmdline, "-S ");
+        ptr =   strchr(ptr, '/');
+        brptr = strstr(ptr, "--brick-name");
+        i = 0;
+
+        while (ptr < brptr) {
+                if (*ptr != 32)
+                        tmpsockpath[i++] = *ptr;
+                ptr++;
+        }
+
+        if (tmpsockpath[0]) {
+                strncpy (sockpath, tmpsockpath , i);
+        }
+
+}
+
+
 int
 glusterd_brick_start (glusterd_volinfo_t *volinfo,
                       glusterd_brickinfo_t *brickinfo,
@@ -5295,7 +5366,6 @@ glusterd_brick_start (glusterd_volinfo_t *volinfo,
         glusterd_conf_t         *conf = NULL;
         int32_t                 pid                   = -1;
         char                    pidfile[PATH_MAX]     = {0};
-        FILE                    *fp;
         char                    socketpath[PATH_MAX]  = {0};
         glusterd_volinfo_t      *other_vol;
 
@@ -5349,8 +5419,16 @@ glusterd_brick_start (glusterd_volinfo_t *volinfo,
                          * same port (on another brick) and re-use that.
                          * TBD: re-use RPC connection across bricks
                          */
-                        glusterd_set_brick_socket_filepath (volinfo, brickinfo,
-                                        socketpath, sizeof (socketpath));
+                        if (is_brick_mx_enabled ())
+                                glusterd_get_sock_from_brick_pid (pid, socketpath,
+                                                                  sizeof(socketpath));
+                        else
+                                glusterd_set_brick_socket_filepath (volinfo, brickinfo,
+                                                                    socketpath,
+                                                                    sizeof (socketpath));
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "Using %s as sockfile for brick %s of volume %s ",
+                                socketpath, brickinfo->path, volinfo->volname);
                         (void) glusterd_brick_connect (volinfo, brickinfo,
                                         socketpath);
                 }
@@ -5389,12 +5467,6 @@ glusterd_brick_start (glusterd_volinfo_t *volinfo,
          *
          * TBD: pray for GlusterD 2 to be ready soon.
          */
-        (void) sys_unlink (pidfile);
-        fp = fopen (pidfile, "w+");
-        if (fp) {
-                (void) fprintf (fp, "0\n");
-                (void) fclose (fp);
-        }
 
         ret = glusterd_volume_start_glusterfs (volinfo, brickinfo, wait);
         if (ret) {
diff --git a/xlators/mgmt/glusterd/src/glusterd.c b/xlators/mgmt/glusterd/src/glusterd.c
index bbd7adcac1b..ef20689b614 100644
--- a/xlators/mgmt/glusterd/src/glusterd.c
+++ b/xlators/mgmt/glusterd/src/glusterd.c
@@ -1854,9 +1854,6 @@ init (xlator_t *this)
         if (glusterd_get_peers_count () < 2)
                 glusterd_launch_synctask (glusterd_spawn_daemons, NULL);
 
-        ret = glusterd_options_init (this);
-        if (ret < 0)
-                goto out;
 
         ret = glusterd_handle_upgrade_downgrade (this->options, conf, upgrade,
                                                  downgrade);
diff --git a/xlators/mgmt/glusterd/src/glusterd.h b/xlators/mgmt/glusterd/src/glusterd.h
index 55879aa22de..dff5ba15261 100644
--- a/xlators/mgmt/glusterd/src/glusterd.h
+++ b/xlators/mgmt/glusterd/src/glusterd.h
@@ -1243,4 +1243,7 @@ int glusterd_op_remove_tier_brick (dict_t *dict, char **op_errstr,
 int
 glusterd_tier_prevalidate (dict_t *dict, char **op_errstr,
                                dict_t *rsp_dict, uint32_t *op_errno);
+
+int
+glusterd_options_init (xlator_t *this);
 #endif
diff --git a/xlators/storage/posix/src/posix-helpers.c b/xlators/storage/posix/src/posix-helpers.c
index eef1546cc69..cf6f2fc27ed 100644
--- a/xlators/storage/posix/src/posix-helpers.c
+++ b/xlators/storage/posix/src/posix-helpers.c
@@ -51,6 +51,7 @@
 #include "hashfn.h"
 #include "glusterfs-acl.h"
 #include "events.h"
+#include <sys/types.h>
 
 char *marker_xattrs[] = {"trusted.glusterfs.quota.*",
                          "trusted.glusterfs.*.xtime",
@@ -1841,6 +1842,9 @@ posix_health_check_thread_proc (void *data)
         struct posix_private *priv               = NULL;
         uint32_t              interval           = 0;
         int                   ret                = -1;
+        xlator_t                *top             = NULL;
+        xlator_list_t           **trav_p         = NULL;
+        int                     count            = 0;
 
         this = data;
         priv = this->private;
@@ -1852,7 +1856,6 @@ posix_health_check_thread_proc (void *data)
 
         gf_msg_debug (this->name, 0, "health-check thread started, "
                 "interval = %d seconds", interval);
-
         while (1) {
                 /* aborting sleep() is a request to exit this thread, sleep()
                  * will normally not return when cancelled */
@@ -1889,18 +1892,33 @@ abort:
 
         xlator_notify (this->parents->xlator, GF_EVENT_CHILD_DOWN, this);
 
-        ret = sleep (30);
-        if (ret == 0) {
+        /* Below code is use to ensure if brick multiplexing is enabled if
+           count is more than 1 it means brick mux has enabled
+        */
+        if (this->ctx->active) {
+                top = this->ctx->active->first;
+                for (trav_p = &top->children; *trav_p;
+                                               trav_p = &(*trav_p)->next) {
+                        count++;
+                }
+        }
+
+        if (count == 1) {
                 gf_msg (this->name, GF_LOG_EMERG, 0, P_MSG_HEALTHCHECK_FAILED,
                         "still alive! -> SIGTERM");
-                kill (getpid(), SIGTERM);
-        }
+                ret = sleep (30);
 
-        ret = sleep (30);
-        if (ret == 0) {
+                /* Need to kill the process only while brick mux has not enabled
+                */
+                if (ret == 0)
+                        kill (getpid(), SIGTERM);
+
+                ret = sleep (30);
                 gf_msg (this->name, GF_LOG_EMERG, 0, P_MSG_HEALTHCHECK_FAILED,
-                        "still alive! -> SIGKILL");
-                kill (getpid(), SIGKILL);
+                        "still alive! -> SIGTERM");
+                if (ret == 0)
+                        kill (getpid(), SIGTERM);
+
         }
 
         return NULL;