glusterd: add upgrade/downgrade xlator options

If started with upgrade-option, the current behavior is to recreate
brick volfiles, as from 3.2 marker xlator is default.

downgrade option is not functionally supported.

Signed-off-by: shishir gowda <shishirng@gluster.com>
Signed-off-by: Anand Avati <avati@gluster.com>

BUG: 2904 (glusterd should have upgrade/downgrade xlator options)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2904

5 files changed, 80 insertions, 2 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index beb7b0d3fd1..8cb8f8f830e 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -3361,3 +3361,67 @@ out:
         gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
+
+int32_t
+glusterd_recreate_bricks (glusterd_conf_t *conf)
+{
+
+        glusterd_volinfo_t      *volinfo = NULL;
+        int                      ret = 0;
+
+        GF_ASSERT (conf);
+        list_for_each_entry (volinfo, &conf->volumes, vol_list) {
+                ret = generate_brick_volfiles (volinfo);
+        }
+        return ret;
+}
+
+int32_t
+glusterd_handle_upgrade_downgrade (dict_t *options, glusterd_conf_t *conf)
+{
+        int              ret                            = 0;
+        char            *type                           = NULL;
+        gf_boolean_t     upgrade                        = _gf_false;
+        gf_boolean_t     downgrade                      = _gf_false;
+        gf_boolean_t     regenerate_brick_volfiles      = _gf_false;
+
+        ret = dict_get_str (options, "upgrade", &type);
+        if (!ret) {
+                ret = gf_string2boolean (type, &upgrade);
+                if (ret) {
+                        gf_log ("glusterd", GF_LOG_ERROR, "upgrade option "
+                                "%s is not a valid boolean type", type);
+                        ret = -1;
+                        goto out;
+                }
+                if (_gf_true == upgrade)
+                        regenerate_brick_volfiles = _gf_true;
+        }
+
+        ret = dict_get_str (options, "downgrade", &type);
+
+        if (!ret) {
+                ret = gf_string2boolean (type, &downgrade);
+                if (ret) {
+                        gf_log ("glusterd", GF_LOG_ERROR, "downgrade option "
+                                "%s is not a valid boolean type", type);
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        if (upgrade && downgrade) {
+                gf_log ("glusterd", GF_LOG_ERROR, "Both upgrade and downgrade"
+                        " options are set. Only one should be on");
+                ret = -1;
+                goto out;
+        }
+
+        if (!upgrade && !downgrade)
+                ret = 0;
+        if (regenerate_brick_volfiles) {
+                ret = glusterd_recreate_bricks (conf);
+        }
+out:
+        return ret;
+}
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.h b/xlators/mgmt/glusterd/src/glusterd-utils.h
index 7cf06f7ae1f..e28ad27ae25 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.h
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.h
@@ -276,4 +276,8 @@ glusterd_restart_gsyncds (glusterd_conf_t *conf);
 int
 glusterd_start_gsync (char *master, char *slave, char *uuid_str,
                       char **op_errstr);
+int32_t
+glusterd_recreate_bricks (glusterd_conf_t *conf);
+int32_t
+glusterd_handle_upgrade_downgrade (dict_t *options, glusterd_conf_t *conf);
 #endif
diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.c b/xlators/mgmt/glusterd/src/glusterd-volgen.c
index f7f3ddd11a5..159ddae517f 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.c
@@ -1901,7 +1901,7 @@ get_vol_tstamp_file (char *filename, glusterd_volinfo_t *volinfo)
                  PATH_MAX - strlen(filename) - 1);
 }
 
-static int
+int
 generate_brick_volfiles (glusterd_volinfo_t *volinfo)
 {
         glusterd_brickinfo_t    *brickinfo = NULL;
diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.h b/xlators/mgmt/glusterd/src/glusterd-volgen.h
index 518ae94ad8c..3cf2e87b9bb 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.h
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.h
@@ -63,5 +63,5 @@ gf_boolean_t glusterd_check_globaloption (char *key);
 gf_boolean_t
 glusterd_check_voloption_flags (char *key, int32_t flags);
 
-
+int generate_brick_volfiles (glusterd_volinfo_t *volinfo);
 #endif
diff --git a/xlators/mgmt/glusterd/src/glusterd.c b/xlators/mgmt/glusterd/src/glusterd.c
index 670cda00f4e..53f1460bfba 100644
--- a/xlators/mgmt/glusterd/src/glusterd.c
+++ b/xlators/mgmt/glusterd/src/glusterd.c
@@ -714,6 +714,10 @@ init (xlator_t *this)
         glusterd_op_sm_init ();
         glusterd_opinfo_init ();
 
+        ret = glusterd_handle_upgrade_downgrade (this->options, conf);
+        if (ret)
+                goto out;
+
         glusterd_restart_bricks (conf);
         ret = glusterd_restart_gsyncds (conf);
         if (ret)
@@ -818,6 +822,12 @@ struct volume_options options[] = {
         { .key   = {"rpc-auth-allow-insecure"},
           .type  = GF_OPTION_TYPE_BOOL,
         },
+        { .key  = {"upgrade"},
+          .type = GF_OPTION_TYPE_BOOL,
+        },
+        { .key  = {"downgrade"},
+          .type = GF_OPTION_TYPE_BOOL,
+        },
 
         { .key   = {NULL} },
 };