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/*
Copyright (c) 2015 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 __CHANGELOG_EV_HANDLE_H
#define __CHANGELOG_EV_HANDLE_H
#include "list.h"
#include "xlator.h"
#include "rpc-clnt.h"
#include "rot-buffs.h"
struct changelog_clnt;
typedef struct changelog_rpc_clnt {
xlator_t *this;
gf_lock_t lock;
unsigned long ref;
gf_boolean_t disconnected;
unsigned int filter;
char sock[UNIX_PATH_MAX];
struct changelog_clnt *c_clnt; /* back pointer to list holder */
struct rpc_clnt *rpc; /* RPC client endpoint */
struct list_head list; /* ->pending, ->waitq, ->active */
void (*cleanup)
(struct changelog_rpc_clnt *); /* cleanup handler */
} changelog_rpc_clnt_t;
static inline void
changelog_rpc_clnt_ref (changelog_rpc_clnt_t *crpc)
{
LOCK (&crpc->lock);
{
++crpc->ref;
}
UNLOCK (&crpc->lock);
}
static inline void
changelog_set_disconnect_flag (changelog_rpc_clnt_t *crpc, gf_boolean_t flag)
{
crpc->disconnected = flag;
}
static inline int
changelog_rpc_clnt_is_disconnected (changelog_rpc_clnt_t *crpc)
{
return (crpc->disconnected == _gf_true);
}
static inline void
changelog_rpc_clnt_unref (changelog_rpc_clnt_t *crpc)
{
gf_boolean_t gone = _gf_false;
LOCK (&crpc->lock);
{
if (!(--crpc->ref)
&& changelog_rpc_clnt_is_disconnected (crpc)) {
list_del (&crpc->list);
gone = _gf_true;
}
}
UNLOCK (&crpc->lock);
if (gone)
crpc->cleanup (crpc);
}
/**
* This structure holds pending and active clients. On probe RPC all
* an instance of the above structure (@changelog_rpc_clnt) is placed
* in ->pending and gets moved to ->active on a successful connect.
*
* locking rules:
*
* Manipulating ->pending
* ->pending_lock
* ->pending
*
* Manipulating ->active
* ->active_lock
* ->active
*
* Moving object from ->pending to ->active
* ->pending_lock
* ->active_lock
*
* Objects are _never_ moved from ->active to ->pending, i.e., during
* disconnection, the object is destroyed. Well, we could have tried
* to reconnect, but that's pure waste.. let the other end reconnect.
*/
typedef struct changelog_clnt {
xlator_t *this;
/* pending connections */
pthread_mutex_t pending_lock;
pthread_cond_t pending_cond;
struct list_head pending;
/* current active connections */
gf_lock_t active_lock;
struct list_head active;
gf_lock_t wait_lock;
struct list_head waitq;
/* consumer part of rot-buffs */
rbuf_t *rbuf;
unsigned long sequence;
} changelog_clnt_t;
void *changelog_ev_connector (void *);
void *changelog_ev_dispatch (void *);
/* APIs */
void
changelog_ev_queue_connection (changelog_clnt_t *, changelog_rpc_clnt_t *);
void
changelog_ev_cleanup_connections (xlator_t *, changelog_clnt_t *);
#endif
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