global options: add a sample option to handle

Fixes #303

Change-Id: Icdaa804711c43c65b9684f2649437aae1b5c1ed5
Signed-off-by: Amar Tumballi <amarts@redhat.com>

4 files changed, 50 insertions, 5 deletions

diff --git a/libglusterfs/src/globals.c b/libglusterfs/src/globals.c
index a43b80aa060..f182b1c7208 100644
--- a/libglusterfs/src/globals.c
+++ b/libglusterfs/src/globals.c
@@ -144,8 +144,20 @@ static struct xlator_fops global_fops = {
 static int
 global_xl_reconfigure (xlator_t *this, dict_t *options)
 {
+        int ret = -1;
+        gf_boolean_t bool_opt = _gf_false;
+
+        /* This is not added in volume dump, hence adding the options in log
+           would be helpful for debugging later */
         dict_dump_to_log (options);
-        return 0;
+
+        GF_OPTION_RECONF ("measure-latency", bool_opt, options, bool, out);
+        this->ctx->measure_latency = bool_opt;
+
+        /* TODO: add more things here */
+        ret = 0;
+out:
+        return ret;
 }
 
 static int
@@ -160,11 +172,25 @@ global_xl_fini (xlator_t *this)
         return;
 }
 
+struct volume_options global_xl_options[] = {
+        { .key   = {"measure-latency"},
+          .type  = GF_OPTION_TYPE_BOOL,
+          .default_value = "no",
+          .op_version = {GD_OP_VERSION_4_0_0},
+          .flags = OPT_FLAG_SETTABLE,
+          .tags = {"global", "context"},
+          .description = "Use this option to toggle measuring latency"
+        },
+
+        { .key = {NULL},},
+};
+
+static volume_opt_list_t global_xl_opt_list;
+
 int
 glusterfs_this_init ()
 {
-        int  ret = 0;
-
+        int ret = 0;
         ret = pthread_key_create (&this_xlator_key, glusterfs_this_destroy);
         if (ret != 0) {
                 gf_msg ("", GF_LOG_WARNING, ret,
@@ -182,6 +208,10 @@ glusterfs_this_init ()
         global_xlator.fini = global_xl_fini;
 
         INIT_LIST_HEAD (&global_xlator.volume_options);
+        INIT_LIST_HEAD (&global_xl_opt_list.list);
+        global_xl_opt_list.given_opt = global_xl_options;
+
+        list_add_tail (&global_xl_opt_list.list, &global_xlator.volume_options);
 
         return ret;
 }
diff --git a/libglusterfs/src/globals.h b/libglusterfs/src/globals.h
index bf73f2e6671..1fc9b562b9b 100644
--- a/libglusterfs/src/globals.h
+++ b/libglusterfs/src/globals.h
@@ -98,6 +98,7 @@
 #define GD_OP_VER_PERSISTENT_AFR_XATTRS GD_OP_VERSION_3_6_0
 
 #include "xlator.h"
+#include "options.h"
 
 /* THIS */
 #define THIS (*__glusterfs_this_location())
@@ -108,6 +109,7 @@ xlator_t *glusterfs_this_get (void);
 int glusterfs_this_set (xlator_t *);
 
 extern xlator_t global_xlator;
+extern struct volume_options global_xl_options[];
 
 /* syncopctx */
 void *syncopctx_getctx (void);
diff --git a/libglusterfs/src/options.h b/libglusterfs/src/options.h
index 6308773a3e1..af6a651a41d 100644
--- a/libglusterfs/src/options.h
+++ b/libglusterfs/src/options.h
@@ -296,7 +296,7 @@ xlator_option_reconf_##type (xlator_t *this, dict_t *options, char *key, \
                         "option %s using default value %s",             \
                         key, value);                                    \
         } else {                                                        \
-                gf_msg_debug (this->name, 0,                            \
+                gf_msg (this->name, GF_LOG_INFO, 0, 0,                  \
                         "option %s using set value %s",                 \
                         key, value);                                    \
         }                                                               \
diff --git a/libglusterfs/src/xlator.c b/libglusterfs/src/xlator.c
index fdc2be144a6..4817da43da1 100644
--- a/libglusterfs/src/xlator.c
+++ b/libglusterfs/src/xlator.c
@@ -308,6 +308,8 @@ xlator_set_type (xlator_t *xl, const char *type)
         /* Handle 'global' translator differently */
         if (!strncmp (GF_GLOBAL_XLATOR_NAME, type,
                       strlen (GF_GLOBAL_XLATOR_NAME))) {
+                volume_opt_list_t *vol_opt = NULL;
+
                 /* set the required values from Global xlator */
                 xl->type = gf_strdup (GF_GLOBAL_XLATOR_NAME);
                 xl->cbks = global_xlator.cbks;
@@ -316,10 +318,21 @@ xlator_set_type (xlator_t *xl, const char *type)
                 xl->fini = global_xlator.fini;
                 xl->reconfigure = global_xlator.reconfigure;
 
+                vol_opt = GF_CALLOC (1, sizeof (volume_opt_list_t),
+                                     gf_common_mt_volume_opt_list_t);
+                if (!vol_opt) {
+                        ret = -1;
+                        goto out;
+                }
+
+                vol_opt->given_opt = global_xl_options;
+
                 INIT_LIST_HEAD (&xl->volume_options);
+                INIT_LIST_HEAD (&vol_opt->list);
+                list_add_tail (&vol_opt->list, &xl->volume_options);
 
                 fill_defaults(xl);
-
+                ret = 0;
                 goto out;
         }