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-rw-r--r--xlators/features/barrier/src/barrier.h91
1 files changed, 91 insertions, 0 deletions
diff --git a/xlators/features/barrier/src/barrier.h b/xlators/features/barrier/src/barrier.h
new file mode 100644
index 0000000..8face9f
--- /dev/null
+++ b/xlators/features/barrier/src/barrier.h
@@ -0,0 +1,91 @@
+/*
+ Copyright (c) 2014 Red Hat, Inc. <http://www.redhat.com>
+ This file is part of GlusterFS.
+
+ This file is licensed to you under your choice of the GNU Lesser
+ General Public License, version 3 or any later version (LGPLv3 or
+ later), or the GNU General Public License, version 2 (GPLv2), in all
+ cases as published by the Free Software Foundation.
+*/
+
+#ifndef __BARRIER_H__
+#define __BARRIER_H__
+
+#include "barrier-mem-types.h"
+#include "xlator.h"
+#include "timer.h"
+#include "call-stub.h"
+
+#define BARRIER_SAFE_ASSIGN(lock, to, value) \
+ do { \
+ LOCK (&(lock)); \
+ { \
+ to = value; \
+ } \
+ UNLOCK (&(lock)); \
+ } while (0)
+
+#define BARRIER_FOP_CBK(fop_name, label, frame, this, params ...) \
+ do { \
+ barrier_priv_t *_priv = NULL; \
+ call_stub_t *_stub = NULL; \
+ gf_boolean_t _barrier_enabled= _gf_false; \
+ struct list_head queue = {0, }; \
+ \
+ INIT_LIST_HEAD (&queue); \
+ \
+ _priv = this->private; \
+ GF_ASSERT (_priv); \
+ \
+ LOCK (&_priv->lock); \
+ { \
+ if (_priv->barrier_enabled) { \
+ _barrier_enabled = _priv->barrier_enabled;\
+ \
+ _stub = fop_##fop_name##_cbk_stub \
+ (frame, \
+ default_##fop_name##_cbk_resume,\
+ params); \
+ if (!_stub) { \
+ __barrier_disable (this, &queue);\
+ goto unlock; \
+ } \
+ \
+ __barrier_enqueue (this, _stub); \
+ } \
+ } \
+unlock: \
+ UNLOCK (&_priv->lock); \
+ \
+ if (_stub) \
+ goto label; \
+ \
+ if (_barrier_enabled && !_stub) { \
+ gf_log (this->name, GF_LOG_CRITICAL, \
+ "Failed to barrier FOPs, disabling " \
+ "barrier. FOP: %s, ERROR: %s", \
+ #fop_name, strerror (ENOMEM)); \
+ barrier_dequeue_all (this, &queue); \
+ } \
+ \
+ STACK_UNWIND_STRICT (fop_name, frame, params); \
+ goto label; \
+ } while (0)
+
+typedef struct {
+ gf_timer_t *timer;
+ gf_boolean_t barrier_enabled;
+ gf_lock_t lock;
+ struct list_head queue;
+ struct timespec timeout;
+ uint32_t queue_size;
+} barrier_priv_t;
+
+int __barrier_enable (xlator_t *this, barrier_priv_t *priv);
+void __barrier_enqueue (xlator_t *this, call_stub_t *stub);
+void __barrier_disable (xlator_t *this, struct list_head *queue);
+void barrier_timeout (void *data);
+void barrier_dequeue_all (xlator_t *this, struct list_head *queue);
+call_stub_t *__barrier_dequeue (xlator_t *this, struct list_head *queue);
+
+#endif