summaryrefslogtreecommitdiffstats
path: root/xlators/mgmt/glusterd/src/glusterd-handshake.c
blob: 5078526e983cf31f85d5273d7c88dfa7819bcb9e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
/*
   Copyright (c) 2010-2012 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.

   This file is licensed to you under your choice of the GNU Lesser
   General Public License, version 3 or any later version (LGPLv3 or
   later), or the GNU General Public License, version 2 (GPLv2), in all
   cases as published by the Free Software Foundation.
*/

#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif

#include "xlator.h"
#include "defaults.h"
#include "glusterfs.h"
#include "compat-errno.h"

#include "glusterd.h"
#include "glusterd-utils.h"
#include "glusterd-op-sm.h"
#include "glusterd-store.h"

#include "glusterfs3.h"
#include "protocol-common.h"
#include "rpcsvc.h"
#include "rpc-common-xdr.h"

extern struct rpc_clnt_program gd_peer_prog;
extern struct rpc_clnt_program gd_mgmt_prog;
extern struct rpc_clnt_program gd_mgmt_v3_prog;

#define TRUSTED_PREFIX         "trusted-"

typedef ssize_t (*gfs_serialize_t) (struct iovec outmsg, void *data);

static int
get_snap_volname_and_volinfo (const char *volpath, char **volname,
                              glusterd_volinfo_t **volinfo)
{
        int              ret            = -1;
        char            *save_ptr       = NULL;
        char            *str_token      = NULL;
        char            *snapname       = NULL;
        char            *volname_token  = NULL;
        char            *vol            = NULL;
        glusterd_snap_t *snap           = NULL;
        xlator_t        *this           = NULL;

        this = THIS;
        GF_ASSERT (this);
        GF_ASSERT (volpath);
        GF_ASSERT (volinfo);

        str_token = gf_strdup (volpath);
        if (NULL == str_token) {
                goto out;
        }

        /* Input volname will have below formats:
         * /snaps/<snapname>/<volname>.<hostname>
         * or
         * /snaps/<snapname>/<parent-volname>
         * We need to extract snapname and parent_volname */

        /*split string by "/" */
        strtok_r (str_token, "/",  &save_ptr);
        snapname  = strtok_r(NULL, "/", &save_ptr);
        if (!snapname) {
                gf_log(this->name, GF_LOG_ERROR, "Invalid path: %s", volpath);
                goto out;
        }

        volname_token = strtok_r(NULL, "/", &save_ptr);
        if (!volname_token) {
                gf_log(this->name, GF_LOG_ERROR, "Invalid path: %s", volpath);
                goto out;
        }

        snap = glusterd_find_snap_by_name (snapname);
        if (!snap) {
                gf_log(this->name, GF_LOG_ERROR, "Failed to "
                                "fetch snap %s", snapname);
                goto out;
        }

        /* Find if its a parent volume name or snap volume
         * name. This function will succeed if volname_token
         * is a parent volname
         */
        ret = glusterd_volinfo_find (volname_token, volinfo);
        if (ret) {
                *volname = gf_strdup (volname_token);
                if (NULL == *volname) {
                        ret = -1;
                        goto out;
                }

                ret = glusterd_snap_volinfo_find (volname_token, snap,
                                                  volinfo);
                if (ret) {
                        /* Split the volume name */
                        vol = strtok_r (volname_token, ".", &save_ptr);
                        if (!vol) {
                                gf_log(this->name, GF_LOG_ERROR, "Invalid "
                                                "volname (%s)", volname_token);
                                goto out;
                        }

                        ret = glusterd_snap_volinfo_find (vol, snap, volinfo);
                        if (ret) {
                                gf_log(this->name, GF_LOG_ERROR, "Failed to "
                                       "fetch snap volume from volname (%s)",
                                       vol);
                                goto out;
                        }
                }
        } else {
                /*volname_token is parent volname*/
                ret = glusterd_snap_volinfo_find_from_parent_volname (
                                volname_token, snap, volinfo);
                if (ret) {
                        gf_log(this->name, GF_LOG_ERROR, "Failed to "
                                        "fetch snap volume from parent "
                                        "volname (%s)", volname_token);
                        goto out;
                }

                /* Since volname_token is a parent volname we should
                 * get the snap volname here*/
                *volname = gf_strdup ((*volinfo)->volname);
                if (NULL == *volname) {
                        ret = -1;
                        goto out;
                }
        }

out:
        if (ret && NULL != *volname) {
                GF_FREE (*volname);
                *volname = NULL;
        }
        return ret;
}

static size_t
build_volfile_path (const char *volname, char *path,
                    size_t path_len, char *trusted_str)
{
        struct stat              stbuf                  = {0,};
        int32_t                  ret                    = -1;
        glusterd_conf_t         *priv                   = NULL;
        char                    *vol                    = NULL;
        char                    *dup_volname            = NULL;
        char                    *free_ptr               = NULL;
        char                    *save_ptr               = NULL;
        char                    *str_token              = NULL;
        glusterd_volinfo_t      *volinfo                = NULL;
        char                    *server                 = NULL;
        const char              *volname_ptr            = NULL;
        char                     path_prefix [PATH_MAX] = {0,};
        xlator_t                *this                   = NULL;

        this = THIS;
        GF_ASSERT (this);
        priv = this->private;
        GF_ASSERT (priv);
        GF_ASSERT (volname);
        GF_ASSERT (path);

        if (strstr (volname, "gluster/")) {
                server = strchr (volname, '/') + 1;
                glusterd_get_nodesvc_volfile (server, priv->workdir,
                                              path, path_len);
                ret = 1;
                goto out;
        } else if ((str_token = strstr (volname, "/snaps/"))) {
                ret = get_snap_volname_and_volinfo (str_token, &dup_volname,
                                                    &volinfo);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get snap"
                                " volinfo from path (%s)", volname);
                        ret = -1;
                        goto out;
                }

                snprintf (path_prefix, sizeof (path_prefix), "%s/snaps/%s",
                          priv->workdir, volinfo->snapshot->snapname);

                free_ptr = dup_volname;
                volname_ptr = dup_volname;
                goto gotvolinfo;
        } else if (volname[0] != '/') {
                /* Normal behavior */
                dup_volname = gf_strdup (volname);
        } else {
                /* Bringing in NFS like behavior for mount command,    */
                /* With this, one can mount a volume with below cmd    */
                /* bash# mount -t glusterfs server:/volume /mnt/pnt    */
                dup_volname = gf_strdup (&volname[1]);
        }

        if (!dup_volname) {
                gf_log(THIS->name, GF_LOG_ERROR, "strdup failed");
                ret = -1;
                goto out;
        }
        free_ptr = dup_volname;
        volname_ptr = volname;

        snprintf (path_prefix, sizeof (path_prefix), "%s/vols",
                  priv->workdir);

        ret = glusterd_volinfo_find (dup_volname, &volinfo);

        if (ret) {
                /* Split the volume name */
                vol = strtok_r (dup_volname, ".", &save_ptr);
                if (!vol)
                        goto out;

                ret = glusterd_volinfo_find (vol, &volinfo);
                if (ret)
                        goto out;
        }

gotvolinfo:
        if (!glusterd_auth_get_username (volinfo))
                trusted_str = NULL;

        ret = snprintf (path, path_len, "%s/%s/%s.vol", path_prefix,
                        volinfo->volname, volname_ptr);
        if (ret == -1)
                goto out;

        ret = stat (path, &stbuf);

        if ((ret == -1) && (errno == ENOENT)) {
                snprintf (path, path_len, "%s/%s/%s%s-fuse.vol",
                          path_prefix, volinfo->volname,
                          (trusted_str ? trusted_str : ""),
                          dup_volname);

                ret = stat (path, &stbuf);
        }

        if ((ret == -1) && (errno == ENOENT)) {
                snprintf (path, path_len, "%s/%s/%s-tcp.vol",
                          path_prefix, volinfo->volname, volname_ptr);
        }

        ret = 1;
out:
        GF_FREE (free_ptr);
        return ret;
}

/* Get and store op-versions of the clients sending the getspec request
 * Clients of versions <= 3.3, don't send op-versions, their op-versions are
 * defaulted to 1
 */
static int
_get_client_op_versions (gf_getspec_req *args, peer_info_t *peerinfo)
{
        int    ret                   = 0;
        int    client_max_op_version = 1;
        int    client_min_op_version = 1;
        dict_t *dict                 = NULL;

        GF_ASSERT (args);
        GF_ASSERT (peerinfo);

        if (args->xdata.xdata_len) {
                dict = dict_new ();
                if (!dict) {
                        ret = -1;
                        goto out;
                }

                ret = dict_unserialize (args->xdata.xdata_val,
                                        args->xdata.xdata_len, &dict);
                if (ret) {
                        gf_log ("glusterd", GF_LOG_ERROR,
                                "Failed to unserialize request dictionary");
                        goto out;
                }

                ret = dict_get_int32 (dict, "min-op-version",
                                      &client_min_op_version);
                if (ret) {
                        gf_log ("glusterd", GF_LOG_ERROR,
                                "Failed to get client-min-op-version");
                        goto out;
                }

                ret = dict_get_int32 (dict, "max-op-version",
                                      &client_max_op_version);
                if (ret) {
                        gf_log ("glusterd", GF_LOG_ERROR,
                                "Failed to get client-max-op-version");
                        goto out;
                }
        }

        peerinfo->max_op_version = client_max_op_version;
        peerinfo->min_op_version = client_min_op_version;

out:
        return ret;
}

/* Checks if the client supports the volume, ie. client can understand all the
 * options in the volfile
 */
static gf_boolean_t
_client_supports_volume (peer_info_t *peerinfo, int32_t *op_errno)
{
        gf_boolean_t       ret       = _gf_true;
        glusterd_volinfo_t *volinfo  = NULL;

        GF_ASSERT (peerinfo);
        GF_ASSERT (op_errno);


        /* Only check when the volfile being requested is a volume. Not finding
         * a volinfo implies that the volfile requested for is not of a gluster
         * volume. A non volume volfile is requested by the local gluster
         * services like shd and nfs-server. These need not be checked as they
         * will be running at the same op-version as glusterd and will be able
         * to support all the features
         */
        if ((glusterd_volinfo_find (peerinfo->volname, &volinfo) == 0) &&
            ((peerinfo->min_op_version > volinfo->client_op_version) ||
             (peerinfo->max_op_version < volinfo->client_op_version))) {
                ret = _gf_false;
                *op_errno = ENOTSUP;
                gf_log ("glusterd", GF_LOG_INFO,
                        "Client %s (%d -> %d) doesn't support required "
                        "op-version (%d). Rejecting volfile request.",
                        peerinfo->identifier, peerinfo->min_op_version,
                        peerinfo->max_op_version, volinfo->client_op_version);
        }

        return ret;
}

int
__server_getspec (rpcsvc_request_t *req)
{
        int32_t               ret                    = -1;
        int32_t               op_errno               = 0;
        int32_t               spec_fd                = -1;
        size_t                file_len               = 0;
        char                  filename[PATH_MAX]  = {0,};
        struct stat           stbuf                  = {0,};
        char                 *volume                 = NULL;
        char                 *tmp                    = NULL;
        int                   cookie                 = 0;
        rpc_transport_t      *trans                  = NULL;
        gf_getspec_req        args                   = {0,};
        gf_getspec_rsp        rsp                    = {0,};
        char                  addrstr[RPCSVC_PEER_STRLEN] = {0};
        peer_info_t          *peerinfo               = NULL;

        ret = xdr_to_generic (req->msg[0], &args,
                              (xdrproc_t)xdr_gf_getspec_req);
        if (ret < 0) {
                //failed to decode msg;
                req->rpc_err = GARBAGE_ARGS;
                goto fail;
        }

        peerinfo = &req->trans->peerinfo;

        volume = args.key;
        /* Need to strip leading '/' from volnames. This was introduced to
         * support nfs style mount parameters for native gluster mount
         */
        if (volume[0] == '/')
                strncpy (peerinfo->volname, &volume[1], strlen(&volume[1]));
        else
                strncpy (peerinfo->volname, volume, strlen(volume));

        ret = _get_client_op_versions (&args, peerinfo);
        if (ret)
                goto fail;

        if (!_client_supports_volume (peerinfo, &op_errno)) {
                ret = -1;
                goto fail;
        }

        trans = req->trans;
        /* addrstr will be empty for cli socket connections */
        ret = rpcsvc_transport_peername (trans, (char *)&addrstr,
                                         sizeof (addrstr));
        if (ret)
                goto fail;

        tmp  = strrchr (addrstr, ':');
        if (tmp)
                *tmp = '\0';

        /* The trusted volfiles are given to the glusterd owned process like NFS
         * server, self-heal daemon etc., so that they are not inadvertently
         * blocked by a auth.{allow,reject} setting. The trusted volfile is not
         * meant for external users.
         */
        if (strlen (addrstr) && gf_is_local_addr (addrstr)) {

                ret = build_volfile_path (volume, filename,
                                          sizeof (filename),
                                          TRUSTED_PREFIX);
        } else {
                ret = build_volfile_path (volume, filename,
                                          sizeof (filename), NULL);
        }

        if (ret > 0) {
                /* to allocate the proper buffer to hold the file data */
                ret = stat (filename, &stbuf);
                if (ret < 0){
                        gf_log ("glusterd", GF_LOG_ERROR,
                                "Unable to stat %s (%s)",
                                filename, strerror (errno));
                        goto fail;
                }

                spec_fd = open (filename, O_RDONLY);
                if (spec_fd < 0) {
                        gf_log ("glusterd", GF_LOG_ERROR,
                                "Unable to open %s (%s)",
                                filename, strerror (errno));
                        goto fail;
                }
                ret = file_len = stbuf.st_size;
        } else {
                op_errno = ENOENT;
        }

        if (file_len) {
                rsp.spec = CALLOC (file_len+1, sizeof (char));
                if (!rsp.spec) {
                        ret = -1;
                        op_errno = ENOMEM;
                        goto fail;
                }
                ret = read (spec_fd, rsp.spec, file_len);

                close (spec_fd);
        }

        /* convert to XDR */
fail:
        rsp.op_ret   = ret;

        if (op_errno)
                rsp.op_errno = gf_errno_to_error (op_errno);
        if (cookie)
                rsp.op_errno = cookie;

        if (!rsp.spec)
                rsp.spec = strdup ("");

        glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
                               (xdrproc_t)xdr_gf_getspec_rsp);
        free (args.key);//malloced by xdr
        free (rsp.spec);

        return 0;
}

int
server_getspec (rpcsvc_request_t *req)
{
        return glusterd_big_locked_handler (req, __server_getspec);
}

int32_t
__server_event_notify (rpcsvc_request_t *req)
{
        int32_t                 ret             = -1;
        int32_t                 op_errno        =  0;
        gf_event_notify_req     args            = {0,};
        gf_event_notify_rsp     rsp             = {0,};
        dict_t                 *dict            = NULL;
        gf_boolean_t            need_rsp        = _gf_true;

        ret = xdr_to_generic (req->msg[0], &args,
                              (xdrproc_t)xdr_gf_event_notify_req);
        if (ret < 0) {
                req->rpc_err = GARBAGE_ARGS;
                goto fail;
        }

        if (args.dict.dict_len) {
                dict = dict_new ();
                if (!dict)
                        return ret;
                ret = dict_unserialize (args.dict.dict_val,
                                        args.dict.dict_len, &dict);
                if (ret) {
                        gf_log ("", GF_LOG_ERROR, "Failed to unserialize req");
                        goto fail;
                }
        }

        switch (args.op) {
        case GF_EN_DEFRAG_STATUS:
                gf_log ("", GF_LOG_INFO,
                        "received defrag status updated");
                if (dict) {
                        glusterd_defrag_event_notify_handle (dict);
                        need_rsp = _gf_false;
                }
                break;
        default:
                gf_log ("", GF_LOG_ERROR, "Unknown op received in event "
                        "notify");
                ret = -1;
                break;
        }

fail:
        rsp.op_ret   = ret;

        if (op_errno)
                rsp.op_errno = gf_errno_to_error (op_errno);

        if (need_rsp)
                glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
                                       (xdrproc_t)xdr_gf_event_notify_rsp);
        if (dict)
                dict_unref (dict);
        free (args.dict.dict_val);//malloced by xdr

        return 0;
}

int32_t
server_event_notify (rpcsvc_request_t *req)
{
        return glusterd_big_locked_handler (req, __server_event_notify);
}

int
gd_validate_cluster_op_version (xlator_t *this, int cluster_op_version,
                                char *peerid)
{
        int              ret  = -1;
        glusterd_conf_t *conf = NULL;

        conf = this->private;

        if (cluster_op_version > GD_OP_VERSION_MAX) {
                gf_log (this->name, GF_LOG_ERROR,
                        "operating version %d is more than the maximum "
                        "supported (%d) on the machine (as per peer request "
                        "from %s)", cluster_op_version, GD_OP_VERSION_MAX,
                        peerid);
                goto out;
        }

        /* The peer can only reduce its op-version when it doesn't have any
         * volumes. Reducing op-version when it already contains volumes can
         * lead to inconsistencies in the cluster
         */
        if ((cluster_op_version < conf->op_version) &&
            !list_empty (&conf->volumes)) {
                gf_log (this->name, GF_LOG_ERROR,
                        "cannot reduce operating version to %d from current "
                        "version %d as volumes exist (as per peer request from "
                        "%s)", cluster_op_version, conf->op_version, peerid);
                goto out;
        }

        ret = 0;
out:
        return ret;
}

int
__glusterd_mgmt_hndsk_versions (rpcsvc_request_t *req)
{
        dict_t            *dict            = NULL;
        xlator_t          *this            = NULL;
        glusterd_conf_t   *conf            = NULL;
        int                ret             = -1;
        int                op_errno        = EINVAL;
        gf_mgmt_hndsk_req  args            = {{0,},};
        gf_mgmt_hndsk_rsp  rsp             = {0,};

        this = THIS;
        conf = this->private;

        ret = xdr_to_generic (req->msg[0], &args,
                              (xdrproc_t)xdr_gf_mgmt_hndsk_req);
        if (ret < 0) {
                //failed to decode msg;
                req->rpc_err = GARBAGE_ARGS;
                goto out;
        }

        dict = dict_new ();
        if (!dict)
                goto out;

        ret = dict_set_int32 (dict, GD_OP_VERSION_KEY, conf->op_version);
        if (ret) {
                gf_log (this->name, GF_LOG_WARNING,
                        "failed to set operating version");
                rsp.op_ret = ret;
                goto out;
        }

        ret = dict_set_int32 (dict, GD_MIN_OP_VERSION_KEY, GD_OP_VERSION_MIN);
        if (ret) {
                gf_log (this->name, GF_LOG_WARNING,
                        "failed to set %s", GD_MIN_OP_VERSION_KEY);
                rsp.op_ret = ret;
                goto out;
        }

        ret = dict_set_int32 (dict, GD_MAX_OP_VERSION_KEY, GD_OP_VERSION_MAX);
        if (ret) {
                gf_log (this->name, GF_LOG_WARNING,
                        "failed to set %s", GD_MAX_OP_VERSION_KEY);
                rsp.op_ret = ret;
                goto out;
        }

        ret = 0;

        GF_PROTOCOL_DICT_SERIALIZE (this, dict, (&rsp.hndsk.hndsk_val),
                                    rsp.hndsk.hndsk_len, op_errno, out);
out:

        rsp.op_ret = ret;
        rsp.op_errno = op_errno;

        glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
                               (xdrproc_t)xdr_gf_mgmt_hndsk_rsp);

        ret = 0;

        if (dict)
                dict_unref (dict);

        if (args.hndsk.hndsk_val)
                free (args.hndsk.hndsk_val);

        if (rsp.hndsk.hndsk_val)
                GF_FREE (rsp.hndsk.hndsk_val);

        return ret;
}

int
glusterd_mgmt_hndsk_versions (rpcsvc_request_t *req)
{
        return glusterd_big_locked_handler (req,
                                            __glusterd_mgmt_hndsk_versions);
}

int
__glusterd_mgmt_hndsk_versions_ack (rpcsvc_request_t *req)
{
        dict_t            *clnt_dict       = NULL;
        xlator_t          *this            = NULL;
        glusterd_conf_t   *conf            = NULL;
        int                ret             = -1;
        int                op_errno        = EINVAL;
        int                peer_op_version = 0;
        gf_mgmt_hndsk_req  args            = {{0,},};
        gf_mgmt_hndsk_rsp  rsp             = {0,};

        this = THIS;
        conf = this->private;

        ret = xdr_to_generic (req->msg[0], &args,
                              (xdrproc_t)xdr_gf_mgmt_hndsk_req);
        if (ret < 0) {
                //failed to decode msg;
                req->rpc_err = GARBAGE_ARGS;
                goto out;
        }

        GF_PROTOCOL_DICT_UNSERIALIZE (this, clnt_dict, args.hndsk.hndsk_val,
                                      (args.hndsk.hndsk_len), ret, op_errno,
                                      out);

        ret = dict_get_int32 (clnt_dict, GD_OP_VERSION_KEY, &peer_op_version);
        if (ret) {
                gf_log (this->name, GF_LOG_WARNING,
                        "failed to get the op-version key peer=%s",
                        req->trans->peerinfo.identifier);
                goto out;
        }

        ret = gd_validate_cluster_op_version (this, peer_op_version,
                                              req->trans->peerinfo.identifier);
        if (ret)
                goto out;


        /* As this is ACK from the Cluster for the versions supported,
           can set the op-version of 'this' glusterd to the one
           received. */
        gf_log (this->name, GF_LOG_INFO, "using the op-version %d",
                peer_op_version);
        conf->op_version = peer_op_version;
        ret = glusterd_store_global_info (this);
        if (ret)
                gf_log (this->name, GF_LOG_ERROR, "Failed to store op-version");

out:
        rsp.op_ret = ret;
        rsp.op_errno = op_errno;

        glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
                               (xdrproc_t)xdr_gf_mgmt_hndsk_rsp);

        ret = 0;

        if (clnt_dict)
                dict_unref (clnt_dict);

        if (args.hndsk.hndsk_val)
                free (args.hndsk.hndsk_val);

        return ret;
}

int
glusterd_mgmt_hndsk_versions_ack (rpcsvc_request_t *req)
{
        return glusterd_big_locked_handler (req,
                                            __glusterd_mgmt_hndsk_versions_ack);
}

rpcsvc_actor_t gluster_handshake_actors[] = {
        [GF_HNDSK_NULL]         = {"NULL",        GF_HNDSK_NULL,         NULL,                NULL, 0, DRC_NA},
        [GF_HNDSK_GETSPEC]      = {"GETSPEC",     GF_HNDSK_GETSPEC,      server_getspec,      NULL, 0, DRC_NA},
        [GF_HNDSK_EVENT_NOTIFY] = {"EVENTNOTIFY", GF_HNDSK_EVENT_NOTIFY, server_event_notify, NULL, 0, DRC_NA},
};


struct rpcsvc_program gluster_handshake_prog = {
        .progname  = "Gluster Handshake",
        .prognum   = GLUSTER_HNDSK_PROGRAM,
        .progver   = GLUSTER_HNDSK_VERSION,
        .actors    = gluster_handshake_actors,
        .numactors = GF_HNDSK_MAXVALUE,
};

/* A minimal RPC program just for the cli getspec command */
rpcsvc_actor_t gluster_cli_getspec_actors[] = {
        [GF_HNDSK_GETSPEC]      = {"GETSPEC",     GF_HNDSK_GETSPEC,      server_getspec,      NULL, 0, DRC_NA},
};

struct rpcsvc_program gluster_cli_getspec_prog = {
        .progname  = "Gluster Handshake (CLI Getspec)",
        .prognum   = GLUSTER_HNDSK_PROGRAM,
        .progver   = GLUSTER_HNDSK_VERSION,
        .actors    = gluster_cli_getspec_actors,
        .numactors = GF_HNDSK_MAXVALUE,
};


char *glusterd_dump_proc[GF_DUMP_MAXVALUE] = {
        [GF_DUMP_NULL] = "NULL",
        [GF_DUMP_DUMP] = "DUMP",
};

rpc_clnt_prog_t glusterd_dump_prog = {
        .progname       = "GLUSTERD-DUMP",
        .prognum        = GLUSTER_DUMP_PROGRAM,
        .progver        = GLUSTER_DUMP_VERSION,
        .procnames      = glusterd_dump_proc,
};


rpcsvc_actor_t glusterd_mgmt_hndsk_actors[] = {
        [GD_MGMT_HNDSK_NULL]            = {"NULL", GD_MGMT_HNDSK_NULL, NULL,
                                           NULL, 0},
        [GD_MGMT_HNDSK_VERSIONS]        = {"MGMT-VERS", GD_MGMT_HNDSK_VERSIONS,
                                           glusterd_mgmt_hndsk_versions, NULL,
                                           0},
        [GD_MGMT_HNDSK_VERSIONS_ACK]    = {"MGMT-VERS-ACK",
                                           GD_MGMT_HNDSK_VERSIONS_ACK,
                                           glusterd_mgmt_hndsk_versions_ack,
                                           NULL, 0},
};

struct rpcsvc_program glusterd_mgmt_hndsk_prog = {
        .progname       = "Gluster MGMT Handshake",
        .prognum        = GD_MGMT_HNDSK_PROGRAM,
        .progver        = GD_MGMT_HNDSK_VERSION,
        .actors         = glusterd_mgmt_hndsk_actors,
        .numactors      = GD_MGMT_HNDSK_MAXVALUE,
};

char *glusterd_mgmt_hndsk_proc[GD_MGMT_HNDSK_MAXVALUE] = {
        [GD_MGMT_HNDSK_NULL]          = "NULL",
        [GD_MGMT_HNDSK_VERSIONS] = "MGMT-VERS",
        [GD_MGMT_HNDSK_VERSIONS_ACK] = "MGMT-VERS-ACK",
};

rpc_clnt_prog_t gd_clnt_mgmt_hndsk_prog = {
        .progname  = "Gluster MGMT Handshake",
        .prognum   = GD_MGMT_HNDSK_PROGRAM,
        .progver   = GD_MGMT_HNDSK_VERSION,
        .procnames = glusterd_mgmt_hndsk_proc,
};


static int
glusterd_event_connected_inject (glusterd_peerctx_t *peerctx)
{
        GF_ASSERT (peerctx);

        glusterd_friend_sm_event_t      *event = NULL;
        glusterd_probe_ctx_t            *ctx = NULL;
        int                             ret = -1;
        glusterd_peerinfo_t             *peerinfo = NULL;


        ret = glusterd_friend_sm_new_event
                        (GD_FRIEND_EVENT_CONNECTED, &event);

        if (ret) {
                gf_log ("", GF_LOG_ERROR, "Unable to get new event");
                goto out;
        }

        ctx = GF_CALLOC (1, sizeof(*ctx), gf_gld_mt_probe_ctx_t);

        if (!ctx) {
                ret = -1;
                gf_log ("", GF_LOG_ERROR, "Memory not available");
                goto out;
        }

        peerinfo = peerctx->peerinfo;
        ctx->hostname = gf_strdup (peerinfo->hostname);
        ctx->port = peerinfo->port;
        ctx->req = peerctx->args.req;
        ctx->dict = peerctx->args.dict;

        event->peerinfo = peerinfo;
        event->ctx = ctx;

        ret = glusterd_friend_sm_inject_event (event);

        if (ret) {
                gf_log ("glusterd", GF_LOG_ERROR, "Unable to inject "
                        "EVENT_CONNECTED ret = %d", ret);
                goto out;
        }

out:
        gf_log ("", GF_LOG_DEBUG, "returning %d", ret);
        return ret;
}


int
gd_validate_peer_op_version (xlator_t *this, glusterd_peerinfo_t *peerinfo,
                             dict_t *dict, char **errstr)
{
        int              ret  = -1;
        glusterd_conf_t *conf = NULL;
        int32_t          peer_op_version = 0;
        int32_t          peer_min_op_version = 0;
        int32_t          peer_max_op_version = 0;

        if (!dict && !this && !peerinfo)
                goto out;

        conf = this->private;

        ret = dict_get_int32 (dict, GD_OP_VERSION_KEY, &peer_op_version);
        if (ret)
                goto out;

        ret = dict_get_int32 (dict, GD_MAX_OP_VERSION_KEY,
                              &peer_max_op_version);
        if (ret)
                goto out;

        ret = dict_get_int32 (dict, GD_MIN_OP_VERSION_KEY,
                              &peer_min_op_version);
        if (ret)
                goto out;

        ret = -1;
        /* Check if peer can support our op_version */
        if ((peer_max_op_version < conf->op_version) ||
            (peer_min_op_version > conf->op_version)) {
                ret = gf_asprintf (errstr, "Peer %s does not support required "
                                   "op-version", peerinfo->hostname);
                ret = -1;
                goto out;
        }

        ret = 0;
out:
        gf_log (this->name , GF_LOG_DEBUG, "Peer %s %s", peerinfo->hostname,
                ((ret < 0) ? "rejected" : "accepted"));
        return ret;
}

int
__glusterd_mgmt_hndsk_version_ack_cbk (struct rpc_req *req, struct iovec *iov,
                                     int count, void *myframe)
{
        int                  ret      = -1;
        int                  op_errno = EINVAL;
        gf_mgmt_hndsk_rsp    rsp      = {0,};
        xlator_t            *this     = NULL;
        call_frame_t        *frame    = NULL;
        glusterd_peerinfo_t *peerinfo = NULL;
        glusterd_peerctx_t  *peerctx  = NULL;
        char                msg[1024] = {0,};

        this = THIS;
        frame = myframe;
        peerctx = frame->local;
        peerinfo = peerctx->peerinfo;

        if (-1 == req->rpc_status) {
                snprintf (msg, sizeof (msg),
                          "Error through RPC layer, retry again later");
                gf_log ("", GF_LOG_ERROR, "%s", msg);
                peerctx->errstr = gf_strdup (msg);
                goto out;
        }

        ret = xdr_to_generic (*iov, &rsp, (xdrproc_t)xdr_gf_mgmt_hndsk_rsp);
        if (ret < 0) {
                snprintf (msg, sizeof (msg), "Failed to decode XDR");
                gf_log ("", GF_LOG_ERROR, "%s", msg);
                peerctx->errstr = gf_strdup (msg);
                goto out;
        }

        op_errno = rsp.op_errno;
        if (-1 == rsp.op_ret) {
                ret = -1;
                snprintf (msg, sizeof (msg),
                          "Failed to get handshake ack from remote server");
                gf_log (frame->this->name, GF_LOG_ERROR, "%s", msg);
                peerctx->errstr = gf_strdup (msg);
                goto out;
        }

        /* TODO: this is hardcoded as of now, but I don't forsee any problems
         * with this as long as we are properly handshaking operating versions
         */
        peerinfo->mgmt = &gd_mgmt_prog;
        peerinfo->peer = &gd_peer_prog;
        peerinfo->mgmt_v3 = &gd_mgmt_v3_prog;

        ret = default_notify (this, GF_EVENT_CHILD_UP, NULL);

        if (GD_MODE_ON == peerctx->args.mode) {
                ret = glusterd_event_connected_inject (peerctx);
                peerctx->args.req = NULL;
        } else if (GD_MODE_SWITCH_ON == peerctx->args.mode) {
                peerctx->args.mode = GD_MODE_ON;
        } else {
                gf_log (this->name, GF_LOG_WARNING, "unknown mode %d",
                        peerctx->args.mode);
        }

        glusterd_friend_sm ();

        ret = 0;
out:

        frame->local = NULL;
        STACK_DESTROY (frame->root);

        if (ret != 0)
                rpc_transport_disconnect (peerinfo->rpc->conn.trans);

        if (rsp.hndsk.hndsk_val)
                free (rsp.hndsk.hndsk_val);

        return 0;
}

int
glusterd_mgmt_hndsk_version_ack_cbk (struct rpc_req *req, struct iovec *iov,
                                     int count, void *myframe)
{
        return glusterd_big_locked_cbk (req, iov, count, myframe,
                                        __glusterd_mgmt_hndsk_version_ack_cbk);
}

int
__glusterd_mgmt_hndsk_version_cbk (struct rpc_req *req, struct iovec *iov,
                                 int count, void *myframe)
{
        int                  ret       = -1;
        int                  op_errno  = EINVAL;
        gf_mgmt_hndsk_rsp    rsp       = {0,};
        gf_mgmt_hndsk_req    arg       = {{0,}};
        xlator_t            *this      = NULL;
        call_frame_t        *frame     = NULL;
        glusterd_peerinfo_t *peerinfo  = NULL;
        glusterd_peerctx_t  *peerctx   = NULL;
        dict_t              *dict      = NULL;
        dict_t              *rsp_dict  = NULL;
        glusterd_conf_t     *conf      = NULL;
        char                 msg[1024] = {0,};

        this = THIS;
        conf = this->private;
        frame = myframe;
        peerctx = frame->local;
        peerinfo = peerctx->peerinfo;

        if (-1 == req->rpc_status) {
                ret = -1;
                snprintf (msg, sizeof (msg),
                          "Error through RPC layer, retry again later");
                gf_log (this->name, GF_LOG_ERROR, "%s", msg);
                peerctx->errstr = gf_strdup (msg);
                goto out;
        }

        ret = xdr_to_generic (*iov, &rsp, (xdrproc_t)xdr_gf_mgmt_hndsk_rsp);
        if (ret < 0) {
                snprintf (msg, sizeof (msg), "Failed to decode management "
                          "handshake response");
                gf_log (this->name, GF_LOG_ERROR, "%s", msg);
                peerctx->errstr = gf_strdup (msg);
                goto out;
        }

        GF_PROTOCOL_DICT_UNSERIALIZE (this, dict, rsp.hndsk.hndsk_val,
                                      rsp.hndsk.hndsk_len, ret, op_errno,
                                      out);

        op_errno = rsp.op_errno;
        if (-1 == rsp.op_ret) {
                gf_log (this->name, GF_LOG_ERROR,
                        "failed to get the 'versions' from peer (%s)",
                        req->conn->trans->peerinfo.identifier);
                goto out;
        }

        /* Check if peer can be part of cluster */
        ret = gd_validate_peer_op_version (this, peerinfo, dict,
                                           &peerctx->errstr);
        if (ret < 0) {
                gf_log (this->name, GF_LOG_ERROR,
                        "failed to validate the operating version of peer (%s)",
                        peerinfo->hostname);
                goto out;
        }

        rsp_dict = dict_new ();
        if (!rsp_dict)
                goto out;

        ret = dict_set_int32 (rsp_dict, GD_OP_VERSION_KEY, conf->op_version);
        if (ret) {
                gf_log(this->name, GF_LOG_ERROR,
                       "failed to set operating version in dict");
                goto out;
        }

        GF_PROTOCOL_DICT_SERIALIZE (this, rsp_dict, (&arg.hndsk.hndsk_val),
                                    arg.hndsk.hndsk_len, op_errno, out);

        ret = glusterd_submit_request (peerctx->peerinfo->rpc, &arg, frame,
                                       &gd_clnt_mgmt_hndsk_prog,
                                       GD_MGMT_HNDSK_VERSIONS_ACK, NULL, this,
                                       glusterd_mgmt_hndsk_version_ack_cbk,
                                       (xdrproc_t)xdr_gf_mgmt_hndsk_req);

out:
        if (ret) {
                frame->local = NULL;
                STACK_DESTROY (frame->root);
                rpc_transport_disconnect (peerinfo->rpc->conn.trans);
        }

        if (rsp.hndsk.hndsk_val)
                free (rsp.hndsk.hndsk_val);

        if (arg.hndsk.hndsk_val)
                GF_FREE (arg.hndsk.hndsk_val);

        if (dict)
                dict_unref (dict);

        if (rsp_dict)
                dict_unref (rsp_dict);

        return 0;
}

int
glusterd_mgmt_hndsk_version_cbk (struct rpc_req *req, struct iovec *iov,
                                     int count, void *myframe)
{
        return glusterd_big_locked_cbk (req, iov, count, myframe,
                                        __glusterd_mgmt_hndsk_version_cbk);
}

int
glusterd_mgmt_handshake (xlator_t *this, glusterd_peerctx_t *peerctx)
{
        call_frame_t        *frame    = NULL;
        gf_mgmt_hndsk_req    req      = {{0,},};
        int                  ret      = -1;

        frame = create_frame (this, this->ctx->pool);
        if (!frame)
                goto out;

        frame->local = peerctx;

        ret = glusterd_submit_request (peerctx->peerinfo->rpc, &req, frame,
                                       &gd_clnt_mgmt_hndsk_prog,
                                       GD_MGMT_HNDSK_VERSIONS, NULL, this,
                                       glusterd_mgmt_hndsk_version_cbk,
                                       (xdrproc_t)xdr_gf_mgmt_hndsk_req);
        ret = 0;
out:
        if (ret && frame)
                STACK_DESTROY (frame->root);

        return ret;
}

int
glusterd_set_clnt_mgmt_program (glusterd_peerinfo_t *peerinfo,
                                gf_prog_detail *prog)
{
        gf_prog_detail  *trav   = NULL;
        int             ret     = -1;

        if (!peerinfo || !prog)
                goto out;

        trav = prog;

        while (trav) {
                ret = -1;
                if ((gd_mgmt_prog.prognum == trav->prognum) &&
                    (gd_mgmt_prog.progver == trav->progver)) {
                        peerinfo->mgmt = &gd_mgmt_prog;
                        ret = 0;
                }

                if ((gd_peer_prog.prognum == trav->prognum) &&
                    (gd_peer_prog.progver == trav->progver)) {
                        peerinfo->peer = &gd_peer_prog;
                        ret = 0;
                }

                if (ret) {
                        gf_log ("", GF_LOG_DEBUG,
                                "%s (%"PRId64":%"PRId64") not supported",
                                trav->progname, trav->prognum,
                                trav->progver);
                }

                trav = trav->next;
        }

        if (peerinfo->mgmt) {
                 gf_log ("", GF_LOG_INFO,
                         "Using Program %s, Num (%d), Version (%d)",
                         peerinfo->mgmt->progname, peerinfo->mgmt->prognum,
                         peerinfo->mgmt->progver);
        }

        if (peerinfo->peer) {
                 gf_log ("", GF_LOG_INFO,
                         "Using Program %s, Num (%d), Version (%d)",
                         peerinfo->peer->progname, peerinfo->peer->prognum,
                         peerinfo->peer->progver);
        }

        if (peerinfo->mgmt_v3) {
                 gf_log ("", GF_LOG_INFO,
                         "Using Program %s, Num (%d), Version (%d)",
                         peerinfo->mgmt_v3->progname,
                         peerinfo->mgmt_v3->prognum,
                         peerinfo->mgmt_v3->progver);
        }

        ret = 0;
out:
        return ret;

}

static gf_boolean_t
_mgmt_hndsk_prog_present (gf_prog_detail *prog) {
        gf_boolean_t    ret = _gf_false;
        gf_prog_detail  *trav = NULL;

        GF_ASSERT (prog);

        trav = prog;

        while (trav) {
                if ((trav->prognum == GD_MGMT_HNDSK_PROGRAM) &&
                    (trav->progver == GD_MGMT_HNDSK_VERSION)) {
                        ret = _gf_true;
                        goto out;
                }
                trav = trav->next;
        }
out:
        return ret;
}

int
__glusterd_peer_dump_version_cbk (struct rpc_req *req, struct iovec *iov,
                                int count, void *myframe)
{
        int                  ret      = -1;
        gf_dump_rsp          rsp      = {0,};
        xlator_t            *this     = NULL;
        gf_prog_detail      *trav     = NULL;
        gf_prog_detail      *next     = NULL;
        call_frame_t        *frame    = NULL;
        glusterd_peerinfo_t *peerinfo = NULL;
        glusterd_peerctx_t  *peerctx  = NULL;
        glusterd_conf_t     *conf     = NULL;
        char                msg[1024] = {0,};

        this = THIS;
        conf = this->private;
        frame = myframe;
        peerctx = frame->local;
        peerinfo = peerctx->peerinfo;

        if (-1 == req->rpc_status) {
                snprintf (msg, sizeof (msg),
                          "Error through RPC layer, retry again later");
                gf_log ("", GF_LOG_ERROR, "%s", msg);
                peerctx->errstr = gf_strdup (msg);
                goto out;
        }

        ret = xdr_to_generic (*iov, &rsp, (xdrproc_t)xdr_gf_dump_rsp);
        if (ret < 0) {
                snprintf (msg, sizeof (msg), "Failed to decode XDR");
                gf_log ("", GF_LOG_ERROR, "%s", msg);
                peerctx->errstr = gf_strdup (msg);
                goto out;
        }
        if (-1 == rsp.op_ret) {
                snprintf (msg, sizeof (msg),
                          "Failed to get the 'versions' from remote server");
                gf_log (frame->this->name, GF_LOG_ERROR, "%s", msg);
                peerctx->errstr = gf_strdup (msg);
                goto out;
        }

        if (_mgmt_hndsk_prog_present (rsp.prog)) {
                gf_log (this->name, GF_LOG_DEBUG,
                        "Proceeding to op-version handshake with peer %s",
                        peerinfo->hostname);
                ret = glusterd_mgmt_handshake (this, peerctx);
                goto out;
        } else if (conf->op_version > 1) {
                ret = -1;
                snprintf (msg, sizeof (msg),
                          "Peer %s does not support required op-version",
                          peerinfo->hostname);
                peerctx->errstr = gf_strdup (msg);
                gf_log (this->name, GF_LOG_ERROR, "%s", msg);
                goto out;
        }

        /* Make sure we assign the proper program to peer */
        ret = glusterd_set_clnt_mgmt_program (peerinfo, rsp.prog);
        if (ret) {
                gf_log ("", GF_LOG_WARNING, "failed to set the mgmt program");
                goto out;
        }

        ret = default_notify (this, GF_EVENT_CHILD_UP, NULL);

        if (GD_MODE_ON == peerctx->args.mode) {
                ret = glusterd_event_connected_inject (peerctx);
                peerctx->args.req = NULL;
        } else if (GD_MODE_SWITCH_ON == peerctx->args.mode) {
                peerctx->args.mode = GD_MODE_ON;
        } else {
                gf_log ("", GF_LOG_WARNING, "unknown mode %d",
                        peerctx->args.mode);
        }

        glusterd_friend_sm();
        glusterd_op_sm();

        ret = 0;

out:

        /* don't use GF_FREE, buffer was allocated by libc */
        if (rsp.prog) {
                trav = rsp.prog;
                while (trav) {
                        next = trav->next;
                        free (trav->progname);
                        free (trav);
                        trav = next;
                }
        }

        frame->local = NULL;
        STACK_DESTROY (frame->root);

        if (ret != 0)
                rpc_transport_disconnect (peerinfo->rpc->conn.trans);

        return 0;
}


int
glusterd_peer_dump_version_cbk (struct rpc_req *req, struct iovec *iov,
                                int count, void *myframe)
{
        return glusterd_big_locked_cbk (req, iov, count, myframe,
                                        __glusterd_peer_dump_version_cbk);
}

int
glusterd_peer_dump_version (xlator_t *this, struct rpc_clnt *rpc,
                            glusterd_peerctx_t *peerctx)
{
        call_frame_t        *frame    = NULL;
        gf_dump_req          req      = {0,};
        int                  ret      = -1;

        frame = create_frame (this, this->ctx->pool);
        if (!frame)
                goto out;

        frame->local = peerctx;

        req.gfs_id = 0xcafe;

        ret = glusterd_submit_request (peerctx->peerinfo->rpc, &req, frame,
                                       &glusterd_dump_prog, GF_DUMP_DUMP,
                                       NULL, this,
                                       glusterd_peer_dump_version_cbk,
                                       (xdrproc_t)xdr_gf_dump_req);
out:
        return ret;
}