ctr/libgfdb: Performance enhancer for unlink/create/rename/link fops

1) ctr_link_consistency option for ctr xaltor is provided so that
   the user can choose to switch it on or off.
   /* For link consistency we do a double update i.e mark the link
   * during the wind and during the unwind we update/delete the link.
   * This has a performance hit. We give a choice here whether we need
   * link consistency to be spoton or not using link_consistency flag.
   * This will have only one link update */

2) In delete the wind time recording is moved to unwind path.
   /* Special performance case:
   * Updating wind time in unwind for delete. This is done here
   * as in the wind path we will not know whether its the last
   * link or not. For a last link there is not use to update any
   * wind or unwind time!*/

>   http://review.gluster.org/#/c/10170/
>   Cherry picked from commit 606d9734543208542afcf9df982bf2d560235ef6
>   Change-Id: I209472fb816f939db4a868b97ba053b028f17ea6
>   BUG: 1217786
>   Signed-off-by: Joseph Fernandes <josferna@redhat.com>
>   Reviewed-on: http://review.gluster.org/10170
>   Reviewed-by: Dan Lambright <dlambrig@redhat.com>
>   Tested-by: Gluster Build System <jenkins@build.gluster.com>
>   Signed-off-by: Joseph Fernandes <josferna@redhat.com>

Change-Id: I4a89ef80875f36cff91520f712e1f47fde258a63
BUG: 1219066
Signed-off-by: Joseph Fernandes <josferna@redhat.com>
Reviewed-on: http://review.gluster.org/10170
Reviewed-by: Dan Lambright <dlambrig@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Signed-off-by: Joseph Fernandes <josferna@redhat.com>
Reviewed-on: http://review.gluster.org/10614
Tested-by: NetBSD Build System
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

3 files changed, 15 insertions, 0 deletions

diff --git a/xlators/features/changetimerecorder/src/changetimerecorder.c b/xlators/features/changetimerecorder/src/changetimerecorder.c
index 42470a92ef9..fd57a445e08 100644
--- a/xlators/features/changetimerecorder/src/changetimerecorder.c
+++ b/xlators/features/changetimerecorder/src/changetimerecorder.c
@@ -958,6 +958,9 @@ reconfigure (xlator_t *this, dict_t *options)
         GF_OPTION_RECONF ("record-counters", _priv->ctr_record_counter, options,
                           bool, out);
 
+        GF_OPTION_RECONF ("ctr_link_consistency", _priv->ctr_link_consistency,
+                        options, bool, out);
+
         GF_OPTION_RECONF ("record-exit", _priv->ctr_record_unwind, options,
                           bool, out);
 
@@ -1154,6 +1157,11 @@ struct volume_options options[] = {
           .value = {"on", "off"},
           .default_value = "off"
         },
+        { .key  = {"ctr_link_consistency"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .value = {"on", "off"},
+          .default_value = "off"
+        },
         { .key  = {"hot-brick"},
           .type = GF_OPTION_TYPE_BOOL,
           .value = {"on", "off"},
diff --git a/xlators/features/changetimerecorder/src/ctr-helper.c b/xlators/features/changetimerecorder/src/ctr-helper.c
index da5a3deed96..a2e2569818d 100644
--- a/xlators/features/changetimerecorder/src/ctr-helper.c
+++ b/xlators/features/changetimerecorder/src/ctr-helper.c
@@ -97,6 +97,7 @@ fill_db_record_for_wind (xlator_t               *this,
         ctr_wtime = &CTR_DB_REC(ctr_local).gfdb_wind_change_time;
         CTR_DB_REC(ctr_local).gfdb_fop_path = ctr_inode_cx->fop_path;
         CTR_DB_REC(ctr_local).gfdb_fop_type = ctr_inode_cx->fop_type;
+        CTR_DB_REC(ctr_local).link_consistency = _priv->ctr_link_consistency;
 
         ret = gettimeofday (ctr_wtime, NULL);
         if (ret) {
@@ -265,6 +266,10 @@ int extract_ctr_options (xlator_t *this, gf_ctr_private_t *_priv) {
         GF_OPTION_INIT ("record-counters", _priv->ctr_record_counter, bool,
                         out);
 
+        /*Extract flag for link consistency*/
+        GF_OPTION_INIT ("ctr_link_consistency", _priv->ctr_link_consistency,
+                        bool, out);
+
         /*Extract flag for hot tier brick*/
         GF_OPTION_INIT ("hot-brick", _priv->ctr_hot_brick, bool, out);
 
diff --git a/xlators/features/changetimerecorder/src/ctr-helper.h b/xlators/features/changetimerecorder/src/ctr-helper.h
index 6f4ad5cbe7a..85ee872fa33 100644
--- a/xlators/features/changetimerecorder/src/ctr-helper.h
+++ b/xlators/features/changetimerecorder/src/ctr-helper.h
@@ -37,6 +37,7 @@ typedef struct gf_ctr_private {
         gf_boolean_t                    ctr_record_wind;
         gf_boolean_t                    ctr_record_unwind;
         gf_boolean_t                    ctr_record_counter;
+        gf_boolean_t                    ctr_link_consistency;
         gfdb_db_type_t                  gfdb_db_type;
         gfdb_sync_type_t                gfdb_sync_type;
         gfdb_conn_node_t                *_db_conn;
@@ -380,6 +381,7 @@ ctr_insert_wind (call_frame_t                    *frame,
                                 "WIND: Error filling  ctr local");
                         goto out;
                 }
+
                 /*Insert the db record*/
                 ret = insert_record (_priv->_db_conn,
                                         &ctr_local->gfdb_db_record);