features/quiesce: new translator

'Quiesce' is used to describe pausing or altering the state of running
 processes on a computer

 In GlusterFS context, this translator looks for CHILD_DOWN/CHILD_UP
 events, and will hold the requests for some time if the child node
 is in disconnected state

 current timeout is 20seconds, will be made tunable soon

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Vijay Bellur <vijay@dev.gluster.com>

BUG: 1500 (Mount point should not be in-accessible between reconnect to server)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1500

1 files changed, 37 insertions, 0 deletions

diff --git a/xlators/features/quiesce/src/quiesce.h b/xlators/features/quiesce/src/quiesce.h
new file mode 100644
index 000000000..2ff7032ef
--- /dev/null
+++ b/xlators/features/quiesce/src/quiesce.h
@@ -0,0 +1,37 @@
+/*
+   Copyright (c) 2010 Gluster, Inc. <http://www.gluster.com>
+   This file is part of GlusterFS.
+
+   GlusterFS is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3 of the License,
+   or (at your option) any later version.
+
+   GlusterFS is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see
+   <http://www.gnu.org/licenses/>.
+*/
+
+
+#ifndef __QUIESCE_H__
+#define __QUIESCE_H__
+
+#include "quiesce-mem-types.h"
+#include "xlator.h"
+#include "timer.h"
+
+typedef struct {
+        gf_timer_t       *timer;
+        gf_boolean_t      pass_through;
+        gf_lock_t         lock;
+        struct list_head  req;
+        int               queue_size;
+        pthread_t         thr;
+} quiesce_priv_t;
+
+#endif