tier/gfdb : Round-Robin read of query files

1. Each brick on a host will get a separate query file.
2. While reading query record from these query files we
   read them in a Round-Robin manner.
3. When an error occurs during migration we rename it to
   query file with an time stamp and .err extension for
   better debugging.

Backport of http://review.gluster.org/13293

> Change-Id: I27c4285d24fd695d2d5cbd9fd7db3879d277ecc8
> BUG: 1302772
> Signed-off-by: Joseph Fernandes <josferna@redhat.com>
> Reviewed-on: http://review.gluster.org/13293
> Smoke: Gluster Build System <jenkins@build.gluster.com>
> Tested-by: N Balachandran <nbalacha@redhat.com>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> Reviewed-by: Dan Lambright <dlambrig@redhat.com>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.com>

Change-Id: I9448f19c10a82fff9b1b3c9387c9026adc0742f1
BUG: 1306514
Signed-off-by: Joseph Fernandes <josferna@redhat.com>
Reviewed-on: http://review.gluster.org/13427
Smoke: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Joseph Fernandes
Tested-by: Joseph Fernandes
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Dan Lambright <dlambrig@redhat.com>

3 files changed, 32 insertions, 32 deletions

diff --git a/libglusterfs/src/gfdb/gfdb_data_store.h b/libglusterfs/src/gfdb/gfdb_data_store.h
index 6a51e01a704..75460a4b886 100644
--- a/libglusterfs/src/gfdb/gfdb_data_store.h
+++ b/libglusterfs/src/gfdb/gfdb_data_store.h
@@ -358,31 +358,31 @@ typedef int (*set_db_params_t)(gfdb_conn_node_t *db_conn,
 
 
 typedef struct gfdb_methods_s {
-        init_db_t init_db;
-        fini_db_t fini_db;
-        find_unchanged_for_time_t find_unchanged_for_time;
-        find_recently_changed_files_t find_recently_changed_files;
-        find_unchanged_for_time_freq_t find_unchanged_for_time_freq;
+        init_db_t                       init_db;
+        fini_db_t                       fini_db;
+        find_unchanged_for_time_t       find_unchanged_for_time;
+        find_recently_changed_files_t   find_recently_changed_files;
+        find_unchanged_for_time_freq_t  find_unchanged_for_time_freq;
         find_recently_changed_files_freq_t find_recently_changed_files_freq;
-        clear_files_heat_t clear_files_heat;
-        get_db_version_t get_db_version;
-        get_db_params_t get_db_params;
-        set_db_params_t set_db_params;
+        clear_files_heat_t              clear_files_heat;
+        get_db_version_t                get_db_version;
+        get_db_params_t                 get_db_params;
+        set_db_params_t                 set_db_params;
         /* Do not expose dbpath directly. Expose it via an */
         /* access function: get_db_path_key(). */
-        char *dbpath;
-        get_db_path_key_t get_db_path_key;
+        char                            *dbpath;
+        get_db_path_key_t               get_db_path_key;
 
         /* Query Record related functions */
-        gfdb_query_record_new_t gfdb_query_record_new;
-        gfdb_query_record_free_t gfdb_query_record_free;
+        gfdb_query_record_new_t         gfdb_query_record_new;
+        gfdb_query_record_free_t        gfdb_query_record_free;
         gfdb_add_link_to_query_record_t gfdb_add_link_to_query_record;
-        gfdb_write_query_record_t gfdb_write_query_record;
-        gfdb_read_query_record_t gfdb_read_query_record;
+        gfdb_write_query_record_t       gfdb_write_query_record;
+        gfdb_read_query_record_t        gfdb_read_query_record;
 
         /* Link info related functions */
-        gfdb_link_info_new_t gfdb_link_info_new;
-        gfdb_link_info_free_t gfdb_link_info_free;
+        gfdb_link_info_new_t            gfdb_link_info_new;
+        gfdb_link_info_free_t           gfdb_link_info_free;
 
 } gfdb_methods_t;
 
@@ -390,5 +390,4 @@ void get_gfdb_methods (gfdb_methods_t *methods);
 
 typedef void (*get_gfdb_methods_t) (gfdb_methods_t *methods);
 
-
 #endif
diff --git a/libglusterfs/src/gfdb/gfdb_data_store_helper.c b/libglusterfs/src/gfdb/gfdb_data_store_helper.c
index ff85e17169d..28e5abe1ba3 100644
--- a/libglusterfs/src/gfdb/gfdb_data_store_helper.c
+++ b/libglusterfs/src/gfdb/gfdb_data_store_helper.c
@@ -1,6 +1,12 @@
 #include "gfdb_data_store_helper.h"
 
 
+/******************************************************************************
+ *
+ *                       Query record related functions
+ *
+ * ****************************************************************************/
+
 /*Create a single link info structure*/
 gfdb_link_info_t*
 gfdb_link_info_new ()
diff --git a/libglusterfs/src/gfdb/gfdb_data_store_helper.h b/libglusterfs/src/gfdb/gfdb_data_store_helper.h
index fe9fbba8795..ce1f1c52281 100644
--- a/libglusterfs/src/gfdb/gfdb_data_store_helper.h
+++ b/libglusterfs/src/gfdb/gfdb_data_store_helper.h
@@ -13,6 +13,7 @@
 #include <time.h>
 #include <sys/time.h>
 #include <string.h>
+#include <fcntl.h>
 
 #include "common-utils.h"
 #include "compat-uuid.h"
@@ -44,20 +45,6 @@ typedef struct gfdb_link_info {
 } gfdb_link_info_t;
 
 
-/*Create a single link info structure*/
-gfdb_link_info_t *gfdb_link_info_new ();
-typedef gfdb_link_info_t *(*gfdb_link_info_new_t) ();
-
-/*Destroy a link info structure*/
-void
-gfdb_link_info_free (gfdb_link_info_t *gfdb_link_info);
-typedef void
-(*gfdb_link_info_free_t) (gfdb_link_info_t *gfdb_link_info);
-
-
-
-
-
 /*Structure used for querying purpose*/
 typedef struct gfdb_query_record {
         uuid_t                          gfid;
@@ -66,7 +53,15 @@ typedef struct gfdb_query_record {
         int                             link_count;
 } gfdb_query_record_t;
 
+/*Create a single link info structure*/
+gfdb_link_info_t *gfdb_link_info_new ();
+typedef gfdb_link_info_t *(*gfdb_link_info_new_t) ();
 
+/*Destroy a link info structure*/
+void
+gfdb_link_info_free (gfdb_link_info_t *gfdb_link_info);
+typedef void
+(*gfdb_link_info_free_t) (gfdb_link_info_t *gfdb_link_info);
 
 /* Function to create the query_record */
 gfdb_query_record_t *