glusterd: provide option to take statedump of the nfs server

Currently the cli command for taking statedump is for glusterfs servers
only. Statedump of nfs server cannot be taken. With this patch if one
gives nfs as an option to the statedump command, then the nfs-server's
statedump is taken.

Change-Id: I4ef7a68e608da4aa2f17541d7b42cd78ce2624b6
BUG: 771587
Signed-off-by: Raghavendra Bhat <raghavendrabhat@gluster.com>
Reviewed-on: http://review.gluster.com/2579
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amar@gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

5 files changed, 124 insertions, 13 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-op-sm.c b/xlators/mgmt/glusterd/src/glusterd-op-sm.c
index 38d73b1f737..f24cb9b1332 100644
--- a/xlators/mgmt/glusterd/src/glusterd-op-sm.c
+++ b/xlators/mgmt/glusterd/src/glusterd-op-sm.c
@@ -2459,7 +2459,7 @@ glusterd_op_commit_perform (glusterd_op_t op, dict_t *dict, char **op_errstr,
                         break;
 
                 case GD_OP_STATEDUMP_VOLUME:
-                        ret = glusterd_op_statedump_volume (dict);
+                        ret = glusterd_op_statedump_volume (dict, op_errstr);
                         break;
 
                 default:
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index efc7069d8d4..c0462d9c779 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -4532,13 +4532,15 @@ int
 glusterd_set_dump_options (char *dumpoptions_path, char *options,
                            int option_cnt)
 {
-        int     ret = -1;
+        int     ret = 0;
         char    *dup_options = NULL;
         char    *option = NULL;
         char    *tmpptr = NULL;
         FILE    *fp = NULL;
+        int     nfs_cnt = 0;
 
-        if (0 == option_cnt) {
+        if (0 == option_cnt ||
+            (option_cnt == 1 && (!strcmp (options, "nfs ")))) {
                 ret = 0;
                 goto out;
         }
@@ -4553,6 +4555,16 @@ glusterd_set_dump_options (char *dumpoptions_path, char *options,
                 dup_options);
         option = strtok_r (dup_options, " ", &tmpptr);
         while (option) {
+                if (!strcmp (option, "nfs")) {
+                        if (nfs_cnt > 0) {
+                                unlink (dumpoptions_path);
+                                ret = 0;
+                                goto out;
+                        }
+                        nfs_cnt++;
+                        option = strtok_r (NULL, " ", &tmpptr);
+                        continue;
+                }
                 fprintf (fp, "%s=yes\n", option);
                 option = strtok_r (NULL, " ", &tmpptr);
         }
@@ -4560,13 +4572,15 @@ glusterd_set_dump_options (char *dumpoptions_path, char *options,
 out:
         if (fp)
                 fclose (fp);
+        if (dup_options)
+                GF_FREE (dup_options);
         return ret;
 }
 
 int
 glusterd_brick_statedump (glusterd_volinfo_t *volinfo,
                           glusterd_brickinfo_t *brickinfo,
-                          char *options, int option_cnt)
+                          char *options, int option_cnt, char **op_errstr)
 {
         int                     ret = -1;
         xlator_t                *this = NULL;
@@ -4618,8 +4632,13 @@ glusterd_brick_statedump (glusterd_volinfo_t *volinfo,
 
         snprintf (dumpoptions_path, sizeof (dumpoptions_path),
                   "/tmp/glusterdump.%d.options", pid);
-        glusterd_set_dump_options (dumpoptions_path, options, option_cnt);
-
+        ret = glusterd_set_dump_options (dumpoptions_path, options, option_cnt);
+        if (ret < 0) {
+                gf_log ("", GF_LOG_ERROR, "error while parsing the statedump "
+                        "options");
+                ret = -1;
+                goto out;
+        }
 
         gf_log ("", GF_LOG_INFO, "Performing statedump on brick with pid %d",
                 pid);
@@ -4627,12 +4646,87 @@ glusterd_brick_statedump (glusterd_volinfo_t *volinfo,
         kill (pid, SIGUSR1);
 
         sleep (1);
+        ret = 0;
+out:
         unlink (dumpoptions_path);
+        if (pidfile)
+                fclose (pidfile);
+        return ret;
+}
+
+int
+glusterd_nfs_statedump (char *options, int option_cnt, char **op_errstr)
+{
+        int                     ret = -1;
+        xlator_t                *this = NULL;
+        glusterd_conf_t         *conf = NULL;
+        char                    pidfile_path[PATH_MAX] = {0,};
+        char                    path[PATH_MAX] = {0,};
+        FILE                    *pidfile = NULL;
+        pid_t                   pid = -1;
+        char                    dumpoptions_path[PATH_MAX] = {0,};
+        char                    *option = NULL;
+        char                    *tmpptr = NULL;
+        char                    *dup_options = NULL;
+        char                    msg[256] = {0,};
+
+        this = THIS;
+        GF_ASSERT (this);
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        dup_options = gf_strdup (options);
+        option = strtok_r (dup_options, " ", &tmpptr);
+        if (strcmp (option, "nfs")) {
+                snprintf (msg, sizeof (msg), "for nfs statedump, options should"
+                          " be after the key nfs");
+                *op_errstr = gf_strdup (msg);
+                ret = -1;
+                goto out;
+        }
+
+        GLUSTERD_GET_NFS_DIR (path, conf);
+        GLUSTERD_GET_NFS_PIDFILE (pidfile_path, path);
+
+        pidfile = fopen (pidfile_path, "r");
+        if (!pidfile) {
+                gf_log ("", GF_LOG_ERROR, "Unable to open pidfile: %s",
+                        pidfile_path);
+                ret = -1;
+                goto out;
+        }
+
+        ret = fscanf (pidfile, "%d", &pid);
+        if (ret <= 0) {
+                gf_log ("", GF_LOG_ERROR, "Unable to get pid of brick process");
+                ret = -1;
+                goto out;
+        }
+
+        snprintf (dumpoptions_path, sizeof (dumpoptions_path),
+                  "/tmp/glusterdump.%d.options", pid);
+        ret = glusterd_set_dump_options (dumpoptions_path, options, option_cnt);
+        if (ret < 0) {
+                gf_log ("", GF_LOG_ERROR, "error while parsing the statedump "
+                        "options");
+                ret = -1;
+                goto out;
+        }
+
+        gf_log ("", GF_LOG_INFO, "Performing statedump on nfs server with "
+                "pid %d", pid);
+
+        kill (pid, SIGUSR1);
+
+        sleep (1);
 
         ret = 0;
 out:
         if (pidfile)
                 fclose (pidfile);
+        unlink (dumpoptions_path);
+        if (dup_options)
+                GF_FREE (dup_options);
         return ret;
 }
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.h b/xlators/mgmt/glusterd/src/glusterd-utils.h
index 13ac026018f..ba1b8f67805 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.h
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.h
@@ -372,8 +372,9 @@ glusterd_is_fuse_available ();
 int
 glusterd_brick_statedump (glusterd_volinfo_t *volinfo,
                           glusterd_brickinfo_t *brickinfo,
-                          char *options, int option_cnt);
-
+                          char *options, int option_cnt, char **op_errstr);
+int
+glusterd_nfs_statedump (char *options, int option_cnt, char **op_errstr);
 gf_boolean_t
 glusterd_is_volume_replicate (glusterd_volinfo_t *volinfo);
 gf_boolean_t
diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-ops.c b/xlators/mgmt/glusterd/src/glusterd-volume-ops.c
index e3971a2763c..1389f78f9d4 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volume-ops.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volume-ops.c
@@ -1383,7 +1383,7 @@ glusterd_op_heal_volume (dict_t *dict, char **op_errstr)
 }
 
 int
-glusterd_op_statedump_volume (dict_t *dict)
+glusterd_op_statedump_volume (dict_t *dict, char **op_errstr)
 {
         int                     ret = 0;
         char                    *volname = NULL;
@@ -1401,11 +1401,19 @@ glusterd_op_statedump_volume (dict_t *dict)
         if (ret)
                 goto out;
         gf_log ("", GF_LOG_DEBUG, "Performing statedump on volume %s", volname);
-        list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
-                ret = glusterd_brick_statedump (volinfo, brickinfo, options,
-                                                option_cnt);
+        if (strstr (options, "nfs") != NULL) {
+                ret = glusterd_nfs_statedump (options, option_cnt, op_errstr);
                 if (ret)
                         goto out;
+        } else {
+                list_for_each_entry (brickinfo, &volinfo->bricks,
+                                                        brick_list) {
+                        ret = glusterd_brick_statedump (volinfo, brickinfo,
+                                                        options, option_cnt,
+                                                        op_errstr);
+                        if (ret)
+                                goto out;
+                }
         }
 
 out:
diff --git a/xlators/mgmt/glusterd/src/glusterd.h b/xlators/mgmt/glusterd/src/glusterd.h
index 7cd34a00892..fe2402ec26b 100644
--- a/xlators/mgmt/glusterd/src/glusterd.h
+++ b/xlators/mgmt/glusterd/src/glusterd.h
@@ -284,6 +284,9 @@ typedef ssize_t (*gd_serialize_t) (struct iovec outmsg, void *args);
                   GLUSTERD_VOLUME_DIR_PREFIX, volinfo->volname, \
                   GLUSTERD_BRICK_INFO_DIR);
 
+#define GLUSTERD_GET_NFS_DIR(path, priv) \
+        snprintf (path, PATH_MAX, "%s/nfs", priv->workdir);
+
 #define GLUSTERD_REMOVE_SLASH_FROM_PATH(path,string) do {               \
                 int i = 0;                                              \
                 for (i = 1; i < strlen (path); i++) {                   \
@@ -300,6 +303,11 @@ typedef ssize_t (*gd_serialize_t) (struct iovec outmsg, void *args);
                           volpath, hostname, exp_path);                 \
         }
 
+#define GLUSTERD_GET_NFS_PIDFILE(pidfile,nfspath) {                     \
+                snprintf (pidfile, PATH_MAX, "%s/run/nfs.pid",          \
+                          nfspath);                                     \
+        }
+
 #define GLUSTERD_STACK_DESTROY(frame) do {\
 		frame->local = NULL;	  \
 		STACK_DESTROY (frame->root);\
@@ -565,7 +573,7 @@ int glusterd_op_stage_rebalance (dict_t *dict, char **op_errstr);
 int glusterd_op_rebalance (dict_t *dict, char **op_errstr, dict_t *rsp_dict);
 
 int glusterd_op_stage_statedump_volume (dict_t *dict, char **op_errstr);
-int glusterd_op_statedump_volume (dict_t *dict);
+int glusterd_op_statedump_volume (dict_t *dict, char **op_errstr);
 
 /* misc */
 void glusterd_do_replace_brick (void *data);