1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Lustre Light Super operations
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_LLITE
23 #include <linux/lustre_lite.h>
24 #include <linux/lustre_ha.h>
26 int ll_reconnect(struct ptlrpc_connection *conn)
28 struct list_head *tmp;
31 /* XXX c_lock semantics! */
32 conn->c_level = LUSTRE_CONN_CON;
34 /* XXX this code MUST be shared with class_obd_connect! */
35 list_for_each(tmp, &conn->c_imports) {
36 struct obd_import *imp = list_entry(tmp, struct obd_import,
38 struct obd_device *obd = imp->imp_obd;
39 struct client_obd *cli = &obd->u.cli;
40 int rq_opc = (obd->obd_type->typ_ops->o_brw)
41 ? OST_CONNECT : MDS_CONNECT;
42 int size[] = { sizeof(cli->cl_target_uuid),
43 sizeof(obd->obd_uuid) };
44 char *tmp[] = {cli->cl_target_uuid, obd->obd_uuid };
45 struct lustre_handle old_hdl;
46 struct ptlrpc_request *request;
47 struct obd_export *ldlmexp;
49 LASSERT(imp->imp_connection == conn);
50 request = ptlrpc_prep_req(imp, rq_opc, 2, size, tmp);
51 request->rq_level = LUSTRE_CONN_NEW;
52 request->rq_replen = lustre_msg_size(0, NULL);
54 * This address is the export that represents our client-side
55 * LDLM service (for ASTs). We should only have one on this
56 * list, so we just grab the first one.
58 * XXX tear down export, call class_obd_connect!
60 ldlmexp = list_entry(obd->obd_exports.next, struct obd_export,
62 request->rq_reqmsg->addr = (__u64)(unsigned long)ldlmexp;
63 request->rq_reqmsg->cookie = ldlmexp->exp_cookie;
64 rc = ptlrpc_queue_wait(request);
65 rc = ptlrpc_check_status(request, rc);
67 CERROR("cannot connect to %s@%s: rc = %d\n",
68 cli->cl_target_uuid, conn->c_remote_uuid, rc);
69 ptlrpc_free_req(request);
70 GOTO(out_disc, rc = -ENOTCONN);
73 old_hdl = imp->imp_handle;
74 imp->imp_handle.addr = request->rq_repmsg->addr;
75 imp->imp_handle.cookie = request->rq_repmsg->cookie;
76 CDEBUG(D_HA, "reconnected to %s@%s (%Lx/%Lx, was %Lx/%Lx)!\n",
77 cli->cl_target_uuid, conn->c_remote_uuid,
78 imp->imp_handle.addr, imp->imp_handle.cookie,
79 old_hdl.addr, old_hdl.cookie);
80 ptlrpc_free_req(request);
82 conn->c_level = LUSTRE_CONN_RECOVD;
88 static int ll_recover_upcall(struct ptlrpc_connection *conn)
95 conn->c_level = LUSTRE_CONN_RECOVD;
97 argv[0] = obd_recovery_upcall;
98 argv[1] = conn->c_remote_uuid;
102 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
105 rc = call_usermodehelper(argv[0], argv, envp);
108 * Tragically, this will never be run, because call_umh doesn't
109 * report errors like -ENOENT to its caller.
111 CERROR("Error invoking recovery upcall (%s): %d\n",
112 obd_recovery_upcall, rc);
113 CERROR("Check /proc/sys/lustre/recovery_upcall?\n");
115 CDEBUG(D_HA, "Invoked upcall %s for connection %s\n",
121 static int ll_recover_reconnect(struct ptlrpc_connection *conn)
124 struct list_head *tmp, *pos;
125 struct ptlrpc_request *req;
129 rc = ll_reconnect(conn);
133 /* 2. walk the request list */
134 spin_lock(&conn->c_lock);
136 CDEBUG(D_HA, "connection %p to %s has last_xid "LPD64"\n",
137 conn, conn->c_remote_uuid, conn->c_last_xid);
139 list_for_each_safe(tmp, pos, &conn->c_sending_head) {
140 req = list_entry(tmp, struct ptlrpc_request, rq_list);
142 /* replay what needs to be replayed */
143 if (req->rq_flags & PTL_RPC_FL_REPLAY) {
144 CDEBUG(D_HA, "FL_REPLAY: xid "LPD64" op %d @ %d\n",
145 req->rq_xid, req->rq_reqmsg->opc,
146 req->rq_import->imp_client->cli_request_portal);
147 rc = ptlrpc_replay_req(req);
149 #error We should not hold a spinlock over such a lengthy operation.
150 #error If necessary, drop spinlock, do operation, re-get spinlock, restart loop.
151 #error If we need to avoid re-processint items, then delete them from the list
152 #error as they are replayed and re-add at the tail of this list, so the next
153 #error item to process will always be at the head of the list.
156 CERROR("recovery replay error %d for req %Ld\n",
162 /* server has seen req, we have reply: skip */
163 if ((req->rq_flags & PTL_RPC_FL_REPLIED) &&
164 req->rq_xid <= conn->c_last_xid) {
165 CDEBUG(D_HA, "REPLIED SKIP: xid "LPD64" op %d @ %d\n",
166 req->rq_xid, req->rq_reqmsg->opc,
167 req->rq_import->imp_client->cli_request_portal);
171 /* server has lost req, we have reply: resend, ign reply */
172 if ((req->rq_flags & PTL_RPC_FL_REPLIED) &&
173 req->rq_xid > conn->c_last_xid) {
174 CDEBUG(D_HA, "REPLIED RESEND: xid "LPD64" op %d @ %d\n",
175 req->rq_xid, req->rq_reqmsg->opc,
176 req->rq_import->imp_client->cli_request_portal);
177 rc = ptlrpc_replay_req(req);
179 CERROR("request resend error %d for req %Ld\n",
185 /* server has seen req, we have lost reply: -ERESTARTSYS */
186 if ( !(req->rq_flags & PTL_RPC_FL_REPLIED) &&
187 req->rq_xid <= conn->c_last_xid) {
188 CDEBUG(D_HA, "RESTARTSYS: xid "LPD64" op %d @ %d\n",
189 req->rq_xid, req->rq_reqmsg->opc,
190 req->rq_import->imp_client->cli_request_portal);
191 ptlrpc_restart_req(req);
194 /* service has not seen req, no reply: resend */
195 if ( !(req->rq_flags & PTL_RPC_FL_REPLIED) &&
196 req->rq_xid > conn->c_last_xid) {
197 CDEBUG(D_HA, "RESEND: xid "LPD64" op %d @ %d\n",
198 req->rq_xid, req->rq_reqmsg->opc,
199 req->rq_import->imp_client->cli_request_portal);
200 ptlrpc_resend_req(req);
205 conn->c_level = LUSTRE_CONN_FULL;
206 recovd_conn_fixed(conn);
208 CERROR("recovery complete on conn %p(%s), waking delayed reqs\n",
209 conn, conn->c_remote_uuid);
210 /* Finally, continue what we delayed since recovery started */
211 list_for_each_safe(tmp, pos, &conn->c_delayed_head) {
212 req = list_entry(tmp, struct ptlrpc_request, rq_list);
213 ptlrpc_continue_req(req);
218 spin_unlock(&conn->c_lock);
222 static int ll_retry_recovery(struct ptlrpc_connection *conn)
224 CDEBUG(D_HA, "Recovery has failed on conn %p\n", conn);
226 /* XXX use a timer, sideshow bob */
227 recovd_conn_fail(conn);
228 /* XXX this is disabled until I fix it so that we don't just keep
229 * XXX retrying in the case of a missing upcall.
235 int ll_recover(struct recovd_data *rd, int phase)
237 struct ptlrpc_connection *conn = class_rd2conn(rd);
243 case PTLRPC_RECOVD_PHASE_PREPARE:
244 RETURN(ll_recover_upcall(conn));
245 case PTLRPC_RECOVD_PHASE_RECOVER:
246 RETURN(ll_recover_reconnect(conn));
247 case PTLRPC_RECOVD_PHASE_FAILURE:
248 RETURN(ll_retry_recovery(conn));