glusterd: volume set changes for lock migration

Change-Id: I48c6f9cdda47503615ba65882acd5eedf0a70c89
BUG: 1326085
Signed-off-by: Susant Palai <spalai@redhat.com>
Reviewed-on: http://review.gluster.org/14024
Smoke: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>

3 files changed, 84 insertions, 3 deletions

diff --git a/xlators/cluster/dht/src/dht-common.h b/xlators/cluster/dht/src/dht-common.h
index a240a72444d..0ef5c81a608 100644
--- a/xlators/cluster/dht/src/dht-common.h
+++ b/xlators/cluster/dht/src/dht-common.h
@@ -444,6 +444,9 @@ struct gf_defrag_info_ {
 
         /* Hard link handle requirement */
         synclock_t                   link_lock;
+
+        /* lock migration flag */
+        gf_boolean_t                 lock_migration_enabled;
 };
 
 typedef struct gf_defrag_info_ gf_defrag_info_t;
@@ -535,6 +538,10 @@ struct dht_conf {
          */
         uint32_t        vol_commit_hash;
         gf_boolean_t    vch_forced;
+
+        /* lock migration */
+
+        gf_boolean_t    lock_migration_enabled;
 };
 typedef struct dht_conf dht_conf_t;
 
diff --git a/xlators/cluster/dht/src/dht-shared.c b/xlators/cluster/dht/src/dht-shared.c
index 856819ac052..0fea1d58e58 100644
--- a/xlators/cluster/dht/src/dht-shared.c
+++ b/xlators/cluster/dht/src/dht-shared.c
@@ -455,7 +455,13 @@ dht_reconfigure (xlator_t *this, dict_t *options)
         GF_OPTION_RECONF ("rebal-throttle", conf->dthrottle, options,
                           str, out);
 
+        GF_OPTION_RECONF ("lock-migration", conf->lock_migration_enabled,
+                          options, bool, out);
+
         if (conf->defrag) {
+                conf->defrag->lock_migration_enabled =
+                                        conf->lock_migration_enabled;
+
                 GF_DECIDE_DEFRAG_THROTTLE_COUNT (throttle_count, conf);
                 gf_msg ("DHT", GF_LOG_INFO, 0,
                         DHT_MSG_REBAL_THROTTLE_INFO,
@@ -588,8 +594,6 @@ err:
         return ret;
 }
 
-
-
 int
 dht_init (xlator_t *this)
 {
@@ -722,8 +726,14 @@ dht_init (xlator_t *this)
 
         GF_OPTION_INIT ("readdir-optimize", conf->readdir_optimize, bool, err);
 
+
+        GF_OPTION_INIT ("lock-migration", conf->lock_migration_enabled,
+                         bool, err);
+
         if (defrag) {
-                GF_OPTION_INIT ("rebalance-stats", defrag->stats, bool, err);
+              defrag->lock_migration_enabled = conf->lock_migration_enabled;
+
+              GF_OPTION_INIT ("rebalance-stats", defrag->stats, bool, err);
                 if (dict_get_str (this->options, "rebalance-filter", &temp_str)
                     == 0) {
                         if (gf_defrag_pattern_list_fill (this, defrag, temp_str)
@@ -1066,5 +1076,12 @@ struct volume_options options[] = {
                          "max of [($(processing units) - 4) / 2), 4]"
         },
 
+        { .key =  {"lock-migration"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
+          .description = " If enabled this feature will migrate the posix locks"
+                         " associated with a file during rebalance"
+        },
+
         { .key  = {NULL} },
 };
diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-set.c b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
index c9c3047b2de..5bb9d9077b5 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volume-set.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
@@ -816,6 +816,53 @@ validate_disperse_heal_enable_disable (glusterd_volinfo_t *volinfo,
         return ret;
 }
 
+static int
+validate_lock_migration_option (glusterd_volinfo_t *volinfo, dict_t *dict,
+                                 char *key, char *value, char **op_errstr)
+{
+        char                 errstr[2048] = "";
+        glusterd_conf_t     *priv         = NULL;
+        int                  ret          = 0;
+        xlator_t            *this         = NULL;
+        gf_boolean_t         b            = _gf_false;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        if (volinfo->replica_count > 1 || volinfo->disperse_count ||
+            volinfo->type == GF_CLUSTER_TYPE_TIER) {
+                snprintf (errstr, sizeof (errstr), "Lock migration is "
+                          "a experimental feature. Currently works with"
+                          " pure distribute volume only");
+                ret = -1;
+
+                gf_msg (this->name, GF_LOG_ERROR, EINVAL,
+                         GD_MSG_INVALID_ENTRY, "%s", errstr);
+
+                *op_errstr = gf_strdup (errstr);
+                goto out;
+        }
+
+        ret = gf_string2boolean (value, &b);
+        if (ret) {
+                snprintf (errstr, sizeof (errstr), "Invalid value"
+                          " for volume set command. Use on/off only.");
+                ret = -1;
+
+                gf_msg (this->name, GF_LOG_ERROR, EINVAL,
+                         GD_MSG_INVALID_ENTRY, "%s", errstr);
+
+                *op_errstr = gf_strdup (errstr);
+
+                goto out;
+        }
+
+        gf_msg_debug (this->name, 0, "Returning %d", ret);
+
+out:
+        return ret;
+}
+
 /* dispatch table for VOLUME SET
  * -----------------------------
  *
@@ -951,6 +998,16 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .validate_fn = validate_defrag_throttle_option,
           .flags       = OPT_FLAG_CLIENT_OPT,
         },
+
+        { .key         = "cluster.lock-migration",
+          .voltype     = "cluster/distribute",
+          .option      = "lock-migration",
+          .value       = "off",
+          .op_version  = GD_OP_VERSION_3_8_0,
+          .validate_fn = validate_lock_migration_option,
+          .flags       = OPT_FLAG_CLIENT_OPT,
+        },
+
         /* NUFA xlator options (Distribute special case) */
         { .key        = "cluster.nufa",
           .voltype    = "cluster/distribute",