1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ptlrpc/llog_net.c
38 * OST<->MDS recovery logging infrastructure.
40 * Invariants in implementation:
41 * - we do not share logs among different OST<->MDS connections, so that
42 * if an OST or MDS fails it need only look at log(s) relevant to itself
44 * Author: Andreas Dilger <adilger@clusterfs.com>
47 #define DEBUG_SUBSYSTEM S_LOG
54 #include <libcfs/libcfs.h>
56 #include <liblustre.h>
59 #include <obd_class.h>
60 #include <lustre_log.h>
61 #include <libcfs/list.h>
65 int llog_origin_connect(struct llog_ctxt *ctxt,
66 struct llog_logid *logid, struct llog_gen *gen,
67 struct obd_uuid *uuid)
69 struct llog_gen_rec *lgr;
70 struct ptlrpc_request *req;
71 struct llogd_conn_body *req_body;
75 if (list_empty(&ctxt->loc_handle->u.chd.chd_head)) {
76 CDEBUG(D_HA, "there is no record related to ctxt %p\n", ctxt);
80 /* FIXME what value for gen->conn_cnt */
81 LLOG_GEN_INC(ctxt->loc_gen);
83 /* first add llog_gen_rec */
87 lgr->lgr_hdr.lrh_len = lgr->lgr_tail.lrt_len = sizeof(*lgr);
88 lgr->lgr_hdr.lrh_type = LLOG_GEN_REC;
89 lgr->lgr_gen = ctxt->loc_gen;
90 rc = llog_add(ctxt, &lgr->lgr_hdr, NULL, NULL, 1);
95 LASSERT(ctxt->loc_imp);
96 req = ptlrpc_request_alloc_pack(ctxt->loc_imp, &RQF_LLOG_ORIGIN_CONNECT,
102 req_body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_CONN_BODY);
103 req_body->lgdc_gen = ctxt->loc_gen;
104 req_body->lgdc_logid = ctxt->loc_handle->lgh_id;
105 req_body->lgdc_ctxt_idx = ctxt->loc_idx + 1;
106 ptlrpc_request_set_replen(req);
108 rc = ptlrpc_queue_wait(req);
109 ptlrpc_req_finished(req);
113 EXPORT_SYMBOL(llog_origin_connect);
115 int llog_handle_connect(struct ptlrpc_request *req)
117 struct obd_device *obd = req->rq_export->exp_obd;
118 struct llogd_conn_body *req_body;
119 struct llog_ctxt *ctxt;
123 req_body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_CONN_BODY);
125 ctxt = llog_get_context(obd, req_body->lgdc_ctxt_idx);
126 rc = llog_connect(ctxt, &req_body->lgdc_logid,
127 &req_body->lgdc_gen, NULL);
131 CERROR("failed at llog_relp_connect\n");
135 EXPORT_SYMBOL(llog_handle_connect);
137 int llog_receptor_accept(struct llog_ctxt *ctxt, struct obd_import *imp)
142 mutex_down(&ctxt->loc_sem);
143 if (ctxt->loc_imp != imp) {
145 CWARN("changing the import %p - %p\n",
147 class_import_put(ctxt->loc_imp);
149 ctxt->loc_imp = class_import_get(imp);
151 mutex_up(&ctxt->loc_sem);
154 EXPORT_SYMBOL(llog_receptor_accept);
156 #else /* !__KERNEL__ */
158 int llog_origin_connect(struct llog_ctxt *ctxt,
159 struct llog_logid *logid, struct llog_gen *gen,
160 struct obd_uuid *uuid)
166 int llog_initiator_connect(struct llog_ctxt *ctxt)
168 struct obd_import *new_imp;
172 new_imp = ctxt->loc_obd->u.cli.cl_import;
173 LASSERTF(ctxt->loc_imp == NULL || ctxt->loc_imp == new_imp,
174 "%p - %p\n", ctxt->loc_imp, new_imp);
175 mutex_down(&ctxt->loc_sem);
176 if (ctxt->loc_imp != new_imp) {
178 class_import_put(ctxt->loc_imp);
179 ctxt->loc_imp = class_import_get(new_imp);
181 mutex_up(&ctxt->loc_sem);
184 EXPORT_SYMBOL(llog_initiator_connect);