dht: The xattrs sent in readdirp should be sent in opendir aswell

As readdir-ahead can be loaded as a child of dht, dht has to specify
the xattrs it is intrested in, as part of opendir call itself.

>Reviewed-on: https://review.gluster.org/16902
>Smoke: Gluster Build System <jenkins@build.gluster.org>
>Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
>NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
>CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
>(cherry picked from commit 0f71338e1d7c0b70f4fe3b19c68612fe730d9de2)

Change-Id: I012ef96cc143b0cef942df78aa7150d85ec38606
BUG: 1435942
Signed-off-by: Poornima G <pgurusid@redhat.com>
Reviewed-on: https://review.gluster.org/16947
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Prashanth Pai <ppai@redhat.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>

3 files changed, 60 insertions, 61 deletions

diff --git a/xlators/cluster/dht/src/dht-common.c b/xlators/cluster/dht/src/dht-common.c
index 7d686eaf87f..8fa894276fc 100644
--- a/xlators/cluster/dht/src/dht-common.c
+++ b/xlators/cluster/dht/src/dht-common.c
@@ -4873,6 +4873,9 @@ dht_opendir (call_frame_t *frame, xlator_t *this, loc_t *loc, fd_t *fd,
         int           op_errno = -1;
         int           i = -1;
         int           ret = 0;
+        gf_boolean_t  new_xdata = _gf_false;
+        xlator_t    **subvolumes = NULL;
+        int           call_count = 0;
 
         VALIDATE_OR_GOTO (frame, err);
         VALIDATE_OR_GOTO (this, err);
@@ -4884,46 +4887,59 @@ dht_opendir (call_frame_t *frame, xlator_t *this, loc_t *loc, fd_t *fd,
         local = dht_local_init (frame, loc, fd, GF_FOP_OPENDIR);
         if (!local) {
                 op_errno = ENOMEM;
-
                 goto err;
         }
 
+        if (!xdata) {
+                xdata = dict_new ();
+                if (!xdata) {
+                        op_errno = ENOMEM;
+                        goto err;
+                }
+                new_xdata = _gf_true;
+        }
+
+        ret = dict_set_uint32 (xdata, conf->link_xattr_name, 256);
+        if (ret)
+                gf_msg (this->name, GF_LOG_WARNING, 0, DHT_MSG_DICT_SET_FAILED,
+                        "Failed to set dictionary value : key = %s",
+                        conf->link_xattr_name);
+
         if ((conf->defrag && conf->defrag->cmd == GF_DEFRAG_CMD_START_TIER) ||
             (conf->defrag && conf->defrag->cmd ==
              GF_DEFRAG_CMD_START_DETACH_TIER) ||
             (!(conf->local_subvols_cnt) || !conf->defrag)) {
-                local->call_cnt = conf->subvolume_cnt;
-
-                for (i = 0; i < conf->subvolume_cnt; i++) {
-                        STACK_WIND_COOKIE (frame, dht_fd_cbk,
-                                           conf->subvolumes[i],
-                                           conf->subvolumes[i],
-                                           conf->subvolumes[i]->fops->opendir,
-                                           loc, fd, xdata);
-                }
+                call_count = local->call_cnt = conf->subvolume_cnt;
+                subvolumes = conf->subvolumes;
         } else {
-                local->call_cnt = conf->local_subvols_cnt;
-                for (i = 0; i < conf->local_subvols_cnt; i++) {
-                        if (conf->readdir_optimize == _gf_true) {
-                                if (conf->local_subvols[i] != local->first_up_subvol)
-                                        ret = dict_set_int32 (local->xattr,
-                                                              GF_READDIR_SKIP_DIRS, 1);
-                                         if (ret)
-                                                 gf_msg (this->name, GF_LOG_ERROR, 0,
-                                                         DHT_MSG_DICT_SET_FAILED,
-                                                         "Failed to set dictionary"
-                                                         " value :key = %s, ret:%d",
-                                                         GF_READDIR_SKIP_DIRS, ret);
+                call_count = local->call_cnt = conf->local_subvols_cnt;
+                subvolumes = conf->local_subvols;
+        }
 
-                        }
-                        STACK_WIND_COOKIE (frame, dht_fd_cbk,
-                                           conf->local_subvols[i],
-                                           conf->local_subvols[i],
-                                           conf->local_subvols[i]->fops->opendir,
-                                           loc, fd, xdata);
+        for (i = 0; i < call_count; i++) {
+                if (conf->readdir_optimize == _gf_true) {
+                        if (subvolumes[i] != local->first_up_subvol)
+                                ret = dict_set_int32 (xdata,
+                                                      GF_READDIR_SKIP_DIRS, 1);
+                                if (ret)
+                                        gf_msg (this->name, GF_LOG_ERROR, 0,
+                                                DHT_MSG_DICT_SET_FAILED,
+                                                "Failed to set dictionary"
+                                                " value :key = %s, ret:%d",
+                                                GF_READDIR_SKIP_DIRS, ret);
                 }
+
+                STACK_WIND_COOKIE (frame, dht_fd_cbk,
+                                   subvolumes[i],
+                                   subvolumes[i],
+                                   subvolumes[i]->fops->opendir,
+                                   loc, fd, xdata);
+                dict_del (xdata, GF_READDIR_SKIP_DIRS);
         }
 
+        if (new_xdata)
+                dict_unref (xdata);
+
         return 0;
 
 err:
diff --git a/xlators/performance/readdir-ahead/src/readdir-ahead.c b/xlators/performance/readdir-ahead/src/readdir-ahead.c
index 9f129aa08d8..2ffcf25d8a7 100644
--- a/xlators/performance/readdir-ahead/src/readdir-ahead.c
+++ b/xlators/performance/readdir-ahead/src/readdir-ahead.c
@@ -415,7 +415,6 @@ rda_fill_fd(call_frame_t *frame, xlator_t *this, fd_t *fd)
 	struct rda_fd_ctx *ctx;
 	off_t offset;
 	struct rda_priv *priv = this->private;
-        int ret = 0;
 
 	ctx = get_rda_fd_ctx(fd, this);
 	if (!ctx)
@@ -461,15 +460,6 @@ rda_fill_fd(call_frame_t *frame, xlator_t *this, fd_t *fd)
 	}
 
 	local->offset = offset;
-        if (local->skip_dir) {
-                ret = dict_set_int32 (ctx->xattrs, GF_READDIR_SKIP_DIRS, 1);
-                if (ret < 0) {
-                        gf_msg (this->name, GF_LOG_ERROR,
-                                0, READDIR_AHEAD_MSG_DICT_OP_FAILED,
-                                "Dict set of key:%s failed with :%d",
-                                GF_READDIR_SKIP_DIRS, ret);
-                }
-        }
 
 	UNLOCK(&ctx->lock);
 
@@ -547,27 +537,12 @@ rda_opendir(call_frame_t *frame, xlator_t *this, loc_t *loc, fd_t *fd,
         dict_t              *xdata_from_req = NULL;
 
         if (xdata) {
-                /*
-                 * Retrieve list of keys set by md-cache xlator and store it
-                 * in local to be consumed in rda_opendir_cbk
-                 */
-                ret = dict_get_str (xdata, GF_MDC_LOADED_KEY_NAMES, &payload);
-                if (ret)
-                        goto wind;
-
                 xdata_from_req = dict_new();
                 if (!xdata_from_req) {
                         op_errno = ENOMEM;
                         goto unwind;
                 }
 
-                ret = rda_unpack_mdc_loaded_keys_to_dict((char *) payload,
-                                                         xdata_from_req);
-                if (ret) {
-                        dict_unref(xdata_from_req);
-                        goto wind;
-                }
-
                 local = mem_get0(this->local_pool);
                 if (!local) {
                         dict_unref(xdata_from_req);
@@ -575,16 +550,25 @@ rda_opendir(call_frame_t *frame, xlator_t *this, loc_t *loc, fd_t *fd,
                         goto unwind;
                 }
 
+                /*
+                 * Retrieve list of keys set by md-cache xlator and store it
+                 * in local to be consumed in rda_opendir_cbk
+                 */
+                ret = dict_get_str (xdata, GF_MDC_LOADED_KEY_NAMES, &payload);
+                if (ret)
+                        goto wind;
+                ret = rda_unpack_mdc_loaded_keys_to_dict((char *) payload,
+                                                         xdata_from_req);
+                if (ret)
+                        goto wind;
+
+                dict_copy (xdata, xdata_from_req);
+                dict_del (xdata_from_req, GF_MDC_LOADED_KEY_NAMES);
+
                 local->xattrs = xdata_from_req;
-                ret = dict_get_int32 (xdata, GF_READDIR_SKIP_DIRS, &local->skip_dir);
                 frame->local = local;
         }
-
 wind:
-        if (xdata)
-                /* Remove the key after consumption. */
-                dict_del (xdata, GF_MDC_LOADED_KEY_NAMES);
-
         STACK_WIND(frame, rda_opendir_cbk, FIRST_CHILD(this),
                    FIRST_CHILD(this)->fops->opendir, loc, fd, xdata);
         return 0;
diff --git a/xlators/performance/readdir-ahead/src/readdir-ahead.h b/xlators/performance/readdir-ahead/src/readdir-ahead.h
index 9f9df05212e..8c663e091f1 100644
--- a/xlators/performance/readdir-ahead/src/readdir-ahead.h
+++ b/xlators/performance/readdir-ahead/src/readdir-ahead.h
@@ -36,8 +36,7 @@ struct rda_local {
 	struct rda_fd_ctx *ctx;
 	fd_t *fd;
 	off_t offset;
-        dict_t *xattrs;      /* md-cache keys to be sent in readdirp() */
-        int32_t skip_dir;
+        dict_t *xattrs;      /* xattrs to be sent in readdirp() */
 };
 
 struct rda_priv {