cluster/dht: Bring option to choose gfid or name based hashing

Change-Id: I11794eb2adceb88e75864aede450e904431a6273
BUG: 1095888
Signed-off-by: Venkatesh Somyajulu <vsomyaju@redhat.com>
Reviewed-on: http://review.gluster.org/8049
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/xlators/cluster/dht/src/dht-shared.c b/xlators/cluster/dht/src/dht-shared.c
index 3d1d635b4ed..53082c505ff 100644
--- a/xlators/cluster/dht/src/dht-shared.c
+++ b/xlators/cluster/dht/src/dht-shared.c
@@ -395,6 +395,10 @@ dht_reconfigure (xlator_t *this, dict_t *options)
 
         GF_OPTION_RECONF ("readdir-optimize", conf->readdir_optimize, options,
                           bool, out);
+        GF_OPTION_RECONF ("randomize-hash-range-by-gfid",
+                          conf->randomize_by_gfid,
+                          options, bool, out);
+
         if (conf->defrag) {
                 GF_OPTION_RECONF ("rebalance-stats", conf->defrag->stats,
                                   options, bool, out);
@@ -643,6 +647,9 @@ dht_init (xlator_t *this)
                 goto err;
         }
 
+        GF_OPTION_INIT ("randomize-hash-range-by-gfid",
+                        conf->randomize_by_gfid, bool, err);
+
         GF_OPTION_INIT ("xattr-name", conf->xattr_name, str, err);
         gf_asprintf (&conf->link_xattr_name, "%s."DHT_LINKFILE_STR,
                      conf->xattr_name);
@@ -793,5 +800,14 @@ struct volume_options options[] = {
           .type = GF_OPTION_TYPE_ANY
         },
 
+        { .key =  {"randomize-hash-range-by-gfid"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
+          .description = "Use gfid of directory to determine the subvolume "
+          "from which hash ranges are allocated starting with 0. "
+          "Note that we still use a directory/file's name to determine the "
+          "subvolume to which it hashes"
+        },
+
         { .key  = {NULL} },
 };