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>
63 #include <lustre_fsfilt.h>
66 int llog_origin_connect(struct llog_ctxt *ctxt,
67 struct llog_logid *logid, struct llog_gen *gen,
68 struct obd_uuid *uuid)
70 struct llog_gen_rec *lgr;
71 struct obd_import *imp;
72 struct ptlrpc_request *request;
73 struct llogd_conn_body *req_body;
74 int size[2] = { sizeof(struct ptlrpc_body),
75 sizeof(struct llogd_conn_body) };
81 LASSERT(ctxt != NULL);
82 LASSERT(ctxt->loc_handle != NULL);
83 LASSERT(ctxt->loc_handle->lgh_file != NULL);
84 LASSERT(ctxt->loc_handle->lgh_file->f_dentry != NULL);
85 inode = ctxt->loc_handle->lgh_file->f_dentry->d_inode;
87 if (list_empty(&ctxt->loc_handle->u.chd.chd_head)) {
88 CDEBUG(D_HA, "there is no record related to ctxt %p\n", ctxt);
92 /* FIXME what value for gen->conn_cnt */
93 LLOG_GEN_INC(ctxt->loc_gen);
95 /* first add llog_gen_rec */
96 OBD_ALLOC(lgr, sizeof(*lgr));
99 lgr->lgr_hdr.lrh_len = lgr->lgr_tail.lrt_len = sizeof(*lgr);
100 lgr->lgr_hdr.lrh_type = LLOG_GEN_REC;
102 handle = fsfilt_start_log(ctxt->loc_exp->exp_obd, inode,
103 FSFILT_OP_CANCEL_UNLINK, NULL, 1);
105 if (IS_ERR(handle)) {
106 CERROR("fsfilt_start failed: %ld\n", PTR_ERR(handle));
107 OBD_FREE(lgr, sizeof(*lgr));
108 rc = PTR_ERR(handle);
111 lgr->lgr_gen = ctxt->loc_gen;
112 rc = llog_add(ctxt, &lgr->lgr_hdr, NULL, NULL, 1);
113 OBD_FREE(lgr, sizeof(*lgr));
115 rc1 = fsfilt_commit(ctxt->loc_exp->exp_obd, inode, handle, 0);
116 if (rc != 1 || rc1 != 0) {
117 rc = (rc != 1) ? rc : rc1;
121 LASSERT(ctxt->loc_imp);
124 request = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
125 LLOG_ORIGIN_CONNECT, 2, size, NULL);
129 req_body = lustre_msg_buf(request->rq_reqmsg, REQ_REC_OFF,
132 req_body->lgdc_gen = ctxt->loc_gen;
133 req_body->lgdc_logid = ctxt->loc_handle->lgh_id;
134 req_body->lgdc_ctxt_idx = ctxt->loc_idx + 1;
135 ptlrpc_req_set_repsize(request, 1, NULL);
137 rc = ptlrpc_queue_wait(request);
138 ptlrpc_req_finished(request);
142 EXPORT_SYMBOL(llog_origin_connect);
144 int llog_handle_connect(struct ptlrpc_request *req)
146 struct obd_device *obd = req->rq_export->exp_obd;
147 struct llogd_conn_body *req_body;
148 struct llog_ctxt *ctxt;
152 req_body = lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF,
155 ctxt = llog_get_context(obd, req_body->lgdc_ctxt_idx);
156 rc = llog_connect(ctxt, &req_body->lgdc_logid,
157 &req_body->lgdc_gen, NULL);
161 CERROR("failed at llog_relp_connect\n");
165 EXPORT_SYMBOL(llog_handle_connect);
167 int llog_receptor_accept(struct llog_ctxt *ctxt, struct obd_import *imp)
171 mutex_down(&ctxt->loc_sem);
172 if (ctxt->loc_imp != imp) {
174 CDEBUG(D_HA, "changing the import %p - %p\n",
176 class_import_put(ctxt->loc_imp);
178 ctxt->loc_imp = class_import_get(imp);
180 mutex_up(&ctxt->loc_sem);
183 EXPORT_SYMBOL(llog_receptor_accept);
185 #else /* !__KERNEL__ */
187 int llog_origin_connect(struct llog_ctxt *ctxt,
188 struct llog_logid *logid, struct llog_gen *gen,
189 struct obd_uuid *uuid)
195 int llog_initiator_connect(struct llog_ctxt *ctxt)
197 struct obd_import *new_imp;
200 new_imp = ctxt->loc_obd->u.cli.cl_import;
201 mutex_down(&ctxt->loc_sem);
202 if (ctxt->loc_imp != new_imp) {
204 class_import_put(ctxt->loc_imp);
205 ctxt->loc_imp = class_import_get(new_imp);
207 mutex_up(&ctxt->loc_sem);
210 EXPORT_SYMBOL(llog_initiator_connect);