server: Mount fails after reboot 1/3 gluster nodes

Problem: At the time of coming up one server node(1x3) after reboot
client is unmounted.The client is unmounted because a client
is getting AUTH_FAILED event and client call fini for the graph.The
client is getting AUTH_FAILED because brick is not attached with a
graph at that moment

Solution: To avoid the unmounting the client graph throw ENOENT error
          from server in case if brick is not attached with server at
          the time of authenticate clients.

> Credits: Xavi Hernandez <xhernandez@redhat.com>
> Change-Id: Ie6fbd73cbcf23a35d8db8841b3b6036e87682f5e
> Fixes: bz#1793852
> Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
> (cherry picked from commit > f6421dff22a6ddaf14134f6894deae219948c89d)

Change-Id: Ie6fbd73cbcf23a35d8db8841b3b6036e87682f5e
Fixes: bz#1794020
Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>

3 files changed, 29 insertions, 16 deletions

diff --git a/tests/bugs/protocol/bug-1433815-auth-allow.t b/tests/bugs/protocol/bug-1433815-auth-allow.t
index fa22ad8afd5..a78c0eb7111 100644
--- a/tests/bugs/protocol/bug-1433815-auth-allow.t
+++ b/tests/bugs/protocol/bug-1433815-auth-allow.t
@@ -17,6 +17,7 @@ TEST $CLI volume create $V0 $H0:$B0/$V0
 # Set auth.allow so it *doesn't* include ourselves.
 TEST $CLI volume set $V0 auth.allow 1.2.3.4
 TEST $CLI volume start $V0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" online_brick_count
 
 # "System getspec" will include the username and password if the request comes
 # from a server (which we are).  Unfortunately, this will cause authentication
diff --git a/xlators/protocol/client/src/client-handshake.c b/xlators/protocol/client/src/client-handshake.c
index c43756a3fec..0002361e961 100644
--- a/xlators/protocol/client/src/client-handshake.c
+++ b/xlators/protocol/client/src/client-handshake.c
@@ -1031,8 +1031,7 @@ client_setvolume_cbk(struct rpc_req *req, struct iovec *iov, int count,
                "SETVOLUME on remote-host failed: %s", remote_error);
 
         errno = op_errno;
-        if (remote_error &&
-            (strcmp("Authentication failed", remote_error) == 0)) {
+        if (remote_error && (op_errno == EACCES)) {
             auth_fail = _gf_true;
             op_ret = 0;
         }
diff --git a/xlators/protocol/server/src/server-handshake.c b/xlators/protocol/server/src/server-handshake.c
index 382f2410ee8..1d1177ddf43 100644
--- a/xlators/protocol/server/src/server-handshake.c
+++ b/xlators/protocol/server/src/server-handshake.c
@@ -250,6 +250,7 @@ server_setvolume(rpcsvc_request_t *req)
     char *subdir_mount = NULL;
     char *client_name = NULL;
     gf_boolean_t cleanup_starting = _gf_false;
+    gf_boolean_t xlator_in_graph = _gf_true;
 
     params = dict_new();
     reply = dict_new();
@@ -311,8 +312,10 @@ server_setvolume(rpcsvc_request_t *req)
     LOCK(&ctx->volfile_lock);
     {
         xl = get_xlator_by_name(this, name);
-        if (!xl)
+        if (!xl) {
+            xlator_in_graph = _gf_false;
             xl = this;
+        }
     }
     UNLOCK(&ctx->volfile_lock);
     if (xl == NULL) {
@@ -568,20 +571,30 @@ server_setvolume(rpcsvc_request_t *req)
                          "failed to set error "
                          "msg");
     } else {
-        gf_event(EVENT_CLIENT_AUTH_REJECT,
-                 "client_uid=%s;"
-                 "client_identifier=%s;server_identifier=%s;"
-                 "brick_path=%s",
-                 client->client_uid, req->trans->peerinfo.identifier,
-                 req->trans->myinfo.identifier, name);
-        gf_msg(this->name, GF_LOG_ERROR, EACCES, PS_MSG_AUTHENTICATE_ERROR,
-               "Cannot authenticate client"
-               " from %s %s",
-               client->client_uid, (clnt_version) ? clnt_version : "old");
-
         op_ret = -1;
-        op_errno = EACCES;
-        ret = dict_set_str(reply, "ERROR", "Authentication failed");
+        if (!xlator_in_graph) {
+            gf_msg(this->name, GF_LOG_ERROR, ENOENT, PS_MSG_AUTHENTICATE_ERROR,
+                   "Cannot authenticate client"
+                   " from %s %s because brick is not attached in graph",
+                   client->client_uid, (clnt_version) ? clnt_version : "old");
+
+            op_errno = ENOENT;
+            ret = dict_set_str(reply, "ERROR", "Brick not found");
+        } else {
+            gf_event(EVENT_CLIENT_AUTH_REJECT,
+                     "client_uid=%s;"
+                     "client_identifier=%s;server_identifier=%s;"
+                     "brick_path=%s",
+                     client->client_uid, req->trans->peerinfo.identifier,
+                     req->trans->myinfo.identifier, name);
+            gf_msg(this->name, GF_LOG_ERROR, EACCES, PS_MSG_AUTHENTICATE_ERROR,
+                   "Cannot authenticate client"
+                   " from %s %s",
+                   client->client_uid, (clnt_version) ? clnt_version : "old");
+
+            op_errno = EACCES;
+            ret = dict_set_str(reply, "ERROR", "Authentication failed");
+        }
         if (ret < 0)
             gf_msg_debug(this->name, 0,
                          "failed to set error "