1 files changed, 97 insertions, 0 deletions
diff --git a/rpc/rpc-lib/src/rpc-drc.h b/rpc/rpc-lib/src/rpc-drc.h
new file mode 100644
index 00000000000..ce66430809b
--- /dev/null
+++ b/rpc/rpc-lib/src/rpc-drc.h
@@ -0,0 +1,97 @@
+/*
+  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;
+    gf_atomic_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 */