1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Portal-RPC reconnection and replay operations, for use in recovery.
6 * This code is issued under the GNU General Public License.
7 * See the file COPYING in this distribution
9 * Copryright (C) 1996 Peter J. Braam <braam@stelias.com>
10 * Copryright (C) 1999 Stelias Computing Inc. <braam@stelias.com>
11 * Copryright (C) 1999 Seagate Technology Inc.
12 * Copryright (C) 2001 Mountain View Data, Inc.
13 * Copryright (C) 2002 Cluster File Systems, Inc.
17 #include <linux/config.h>
18 #include <linux/module.h>
19 #include <linux/kmod.h>
21 #define DEBUG_SUBSYSTEM S_RPC
23 #include <linux/lustre_ha.h>
24 #include <linux/lustre_net.h>
25 #include <linux/obd.h>
27 static int ptlrpc_reconnect(struct ptlrpc_connection *conn)
29 struct list_head *tmp;
32 /* XXX c_lock semantics! */
33 conn->c_level = LUSTRE_CONN_CON;
35 /* XXX this code MUST be shared with class_obd_connect! */
36 list_for_each(tmp, &conn->c_imports) {
37 struct obd_import *imp = list_entry(tmp, struct obd_import,
39 struct obd_device *obd = imp->imp_obd;
40 struct client_obd *cli = &obd->u.cli;
41 int rq_opc = (obd->obd_type->typ_ops->o_brw)
42 ? OST_CONNECT : MDS_CONNECT;
43 int size[] = { sizeof(cli->cl_target_uuid),
44 sizeof(obd->obd_uuid) };
45 char *tmp[] = {cli->cl_target_uuid, obd->obd_uuid };
46 struct lustre_handle old_hdl;
47 struct ptlrpc_request *request;
48 struct obd_export *ldlmexp;
50 LASSERT(imp->imp_connection == conn);
51 request = ptlrpc_prep_req(imp, rq_opc, 2, size, tmp);
52 request->rq_level = LUSTRE_CONN_NEW;
53 request->rq_replen = lustre_msg_size(0, NULL);
55 * This address is the export that represents our client-side
56 * LDLM service (for ASTs). We should only have one on this
57 * list, so we just grab the first one.
59 * XXX tear down export, call class_obd_connect!
61 ldlmexp = list_entry(obd->obd_exports.next, struct obd_export,
63 request->rq_reqmsg->addr = (__u64)(unsigned long)ldlmexp;
64 request->rq_reqmsg->cookie = ldlmexp->exp_cookie;
65 rc = ptlrpc_queue_wait(request);
66 rc = ptlrpc_check_status(request, rc);
68 CERROR("cannot connect to %s@%s: rc = %d\n",
69 cli->cl_target_uuid, conn->c_remote_uuid, rc);
70 ptlrpc_free_req(request);
71 GOTO(out_disc, rc = -ENOTCONN);
74 old_hdl = imp->imp_handle;
75 imp->imp_handle.addr = request->rq_repmsg->addr;
76 imp->imp_handle.cookie = request->rq_repmsg->cookie;
77 CERROR("reconnected to %s@%s (%Lx/%Lx, was %Lx/%Lx)!\n",
78 cli->cl_target_uuid, conn->c_remote_uuid,
79 imp->imp_handle.addr, imp->imp_handle.cookie,
80 old_hdl.addr, old_hdl.cookie);
81 ptlrpc_free_req(request);
83 conn->c_level = LUSTRE_CONN_RECOVD;
89 int ptlrpc_run_recovery_upcall(struct ptlrpc_connection *conn)
96 conn->c_level = LUSTRE_CONN_RECOVD;
98 argv[0] = obd_recovery_upcall;
99 argv[1] = conn->c_remote_uuid;
103 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
106 rc = call_usermodehelper(argv[0], argv, envp);
108 CERROR("Error invoking recovery upcall %s for %s: %d\n",
109 argv[0], argv[1], rc);
110 CERROR("Check /proc/sys/lustre/recovery_upcall?\n");
112 CERROR("Invoked upcall %s for connection %s\n",
117 * We don't want to make this a "failed" recovery, because the system
118 * administrator -- or, perhaps, tester -- may well be able to rescue
119 * things by running the correct upcall.
124 int ptlrpc_reconnect_and_replay(struct ptlrpc_connection *conn)
127 struct list_head *tmp, *pos;
128 struct ptlrpc_request *req;
132 rc = ptlrpc_reconnect(conn);
136 /* 2. walk the request list */
137 spin_lock(&conn->c_lock);
139 CDEBUG(D_HA, "connection %p to %s has last_xid "LPD64"\n",
140 conn, conn->c_remote_uuid, conn->c_last_xid);
142 list_for_each_safe(tmp, pos, &conn->c_sending_head) {
143 req = list_entry(tmp, struct ptlrpc_request, rq_list);
145 /* replay what needs to be replayed */
146 if (req->rq_flags & PTL_RPC_FL_REPLAY) {
147 CDEBUG(D_HA, "FL_REPLAY: xid "LPD64" transno "LPD64" op %d @ %d\n",
148 req->rq_xid, req->rq_repmsg->transno, req->rq_reqmsg->opc,
149 req->rq_import->imp_client->cli_request_portal);
150 rc = ptlrpc_replay_req(req);
152 #error We should not hold a spinlock over such a lengthy operation.
153 #error If necessary, drop spinlock, do operation, re-get spinlock, restart loop.
154 #error If we need to avoid re-processint items, then delete them from the list
155 #error as they are replayed and re-add at the tail of this list, so the next
156 #error item to process will always be at the head of the list.
159 CERROR("recovery replay error %d for req %Ld\n",
165 /* server has seen req, we have reply: skip */
166 if ((req->rq_flags & PTL_RPC_FL_REPLIED) &&
167 req->rq_xid <= conn->c_last_xid) {
168 CDEBUG(D_HA, "REPLIED SKIP: xid "LPD64" transno "LPD64" op %d @ %d\n",
169 req->rq_xid, req->rq_repmsg->transno, req->rq_reqmsg->opc,
170 req->rq_import->imp_client->cli_request_portal);
174 /* server has lost req, we have reply: resend, ign reply */
175 if ((req->rq_flags & PTL_RPC_FL_REPLIED) &&
176 req->rq_xid > conn->c_last_xid) {
177 CDEBUG(D_HA, "REPLIED RESEND: xid "LPD64" transno "LPD64" op %d @ %d\n",
178 req->rq_xid, req->rq_repmsg->transno, req->rq_reqmsg->opc,
179 req->rq_import->imp_client->cli_request_portal);
180 rc = ptlrpc_replay_req(req);
182 CERROR("request resend error %d for req %Ld\n",
188 /* server has seen req, we have lost reply: -ERESTARTSYS */
189 if ( !(req->rq_flags & PTL_RPC_FL_REPLIED) &&
190 req->rq_xid <= conn->c_last_xid) {
191 CDEBUG(D_HA, "RESTARTSYS: xid "LPD64" op %d @ %d\n",
192 req->rq_xid, req->rq_reqmsg->opc,
193 req->rq_import->imp_client->cli_request_portal);
194 ptlrpc_restart_req(req);
197 /* service has not seen req, no reply: resend */
198 if ( !(req->rq_flags & PTL_RPC_FL_REPLIED) &&
199 req->rq_xid > conn->c_last_xid) {
200 CDEBUG(D_HA, "RESEND: xid "LPD64" transno "LPD64" op %d @ %d\n",
201 req->rq_xid, req->rq_repmsg->transno, req->rq_reqmsg->opc,
202 req->rq_import->imp_client->cli_request_portal);
203 ptlrpc_resend_req(req);
208 conn->c_level = LUSTRE_CONN_FULL;
209 recovd_conn_fixed(conn);
211 CERROR("recovery complete on conn %p(%s), waking delayed reqs\n",
212 conn, conn->c_remote_uuid);
213 /* Finally, continue what we delayed since recovery started */
214 list_for_each_safe(tmp, pos, &conn->c_delayed_head) {
215 req = list_entry(tmp, struct ptlrpc_request, rq_list);
216 ptlrpc_continue_req(req);
221 spin_unlock(&conn->c_lock);