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/*
Copyright (c) 2013 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 RPC_DRC_H
#define RPC_DRC_H
#include "rpcsvc-common.h"
#include "rpcsvc.h"
#include <glusterfs/locking.h>
#include <glusterfs/dict.h>
#include "rb.h"
/* per-client cache structure */
struct drc_client {
union gf_sock_union sock_union;
/* pointers to the cache */
struct rb_table *rbtree;
/* no. of ops currently cached */
uint32_t op_count;
uint32_t ref;
struct list_head client_list;
};
struct drc_cached_op {
drc_op_state_t state;
int prognum;
int progversion;
int procnum;
rpc_transport_msg_t msg;
drc_client_t *client;
struct list_head client_list;
struct list_head global_list;
int32_t ref;
uint32_t xid;
};
/* global drc definitions */
enum drc_status { DRC_UNINITIATED, DRC_INITIATED };
typedef enum drc_status drc_status_t;
struct drc_globals {
/* allocator must be the first member since
* it is used so in gf_libavl_allocator
*/
struct libavl_allocator allocator;
/* configurable size parameter */
gf_lock_t lock;
uint64_t cache_hits;
uint64_t intransit_hits;
struct mem_pool *mempool;
struct list_head cache_head;
struct list_head clients_head;
uint32_t op_count;
uint32_t client_count;
uint32_t global_cache_size;
drc_type_t type;
drc_lru_factor_t lru_factor;
drc_status_t status;
};
int
rpcsvc_need_drc(rpcsvc_request_t *req);
drc_cached_op_t *
rpcsvc_drc_lookup(rpcsvc_request_t *req);
int
rpcsvc_send_cached_reply(rpcsvc_request_t *req, drc_cached_op_t *reply);
int
rpcsvc_cache_reply(rpcsvc_request_t *req, struct iobref *iobref,
struct iovec *rpchdr, int rpchdrcount, struct iovec *proghdr,
int proghdrcount, struct iovec *payload, int payloadcount);
int
rpcsvc_cache_request(rpcsvc_request_t *req);
int32_t
rpcsvc_drc_priv(rpcsvc_drc_globals_t *drc);
int
rpcsvc_drc_init(rpcsvc_t *svc, dict_t *options);
int
rpcsvc_drc_deinit(rpcsvc_t *svc);
int
rpcsvc_drc_reconfigure(rpcsvc_t *svc, dict_t *options);
#endif /* RPC_DRC_H */
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