readdir-ahead: Add parallel-readdir option in readdir-ahead

parallel-readdir option is defined as belonging to readdir-ahead
in glusterd-volume-set.c, but was not defined in options of
readdir-ahead, fixing the same.

Change-Id: I97cc88b38ab99ade5f066519ca1cb9bfed03a7da
BUG: 1506197
Signed-off-by: Poornima G <pgurusid@redhat.com>

2 files changed, 16 insertions, 0 deletions

diff --git a/xlators/performance/readdir-ahead/src/readdir-ahead.c b/xlators/performance/readdir-ahead/src/readdir-ahead.c
index 82e877512c5..8f5a1f44ca5 100644
--- a/xlators/performance/readdir-ahead/src/readdir-ahead.c
+++ b/xlators/performance/readdir-ahead/src/readdir-ahead.c
@@ -636,6 +636,8 @@ reconfigure(xlator_t *this, dict_t *options)
                          size_uint64, err);
         GF_OPTION_RECONF("rda-cache-limit", priv->rda_cache_limit, options,
                          size_uint64, err);
+        GF_OPTION_RECONF("parallel-readdir", priv->parallel_readdir, options,
+                         bool, err);
 
 	return 0;
 err:
@@ -681,6 +683,8 @@ init(xlator_t *this)
                        err);
         GF_OPTION_INIT("rda-cache-limit", priv->rda_cache_limit, size_uint64,
                        err);
+        GF_OPTION_INIT("parallel-readdir", priv->parallel_readdir, bool,
+                       err);
 
 	return 0;
 
@@ -748,6 +752,17 @@ struct volume_options options[] = {
                          "value, irrespective of the number/size of "
                          "directories cached",
         },
+        { .key = {"parallel-readdir"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .op_version = {GD_OP_VERSION_3_10_0},
+          .flags = OPT_FLAG_SETTABLE | OPT_FLAG_CLIENT_OPT | OPT_FLAG_DOC,
+          .default_value = "off",
+          .description = "If this option is enabled, the readdir operation "
+                         "is performed in parallel on all the bricks, thus "
+                         "improving the performance of readdir. Note that "
+                         "the performance improvement is higher in large "
+                         "clusters"
+        },
         { .key = {NULL} },
 };
 
diff --git a/xlators/performance/readdir-ahead/src/readdir-ahead.h b/xlators/performance/readdir-ahead/src/readdir-ahead.h
index dda1a69246c..3c06cc0f107 100644
--- a/xlators/performance/readdir-ahead/src/readdir-ahead.h
+++ b/xlators/performance/readdir-ahead/src/readdir-ahead.h
@@ -45,6 +45,7 @@ struct rda_priv {
 	uint64_t rda_high_wmark;
         uint64_t rda_cache_limit;
         gf_atomic_t rda_cache_size;
+        gf_boolean_t parallel_readdir;
 };
 
 #endif /* __READDIR_AHEAD_H */