1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lustre/ptlrpc/recover.c
37 *
38 * Author: Mike Shaver <shaver@clusterfs.com>
39 */
40
41 #define DEBUG_SUBSYSTEM S_RPC
42 #include "../../include/linux/libcfs/libcfs.h"
43
44 #include "../include/obd_support.h"
45 #include "../include/lustre_ha.h"
46 #include "../include/lustre_net.h"
47 #include "../include/lustre_import.h"
48 #include "../include/lustre_export.h"
49 #include "../include/obd.h"
50 #include "../include/obd_class.h"
51 #include <linux/list.h>
52
53 #include "ptlrpc_internal.h"
54
55 /**
56 * Start recovery on disconnected import.
57 * This is done by just attempting a connect
58 */
ptlrpc_initiate_recovery(struct obd_import * imp)59 void ptlrpc_initiate_recovery(struct obd_import *imp)
60 {
61 CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd));
62 ptlrpc_connect_import(imp);
63 }
64
65 /**
66 * Identify what request from replay list needs to be replayed next
67 * (based on what we have already replayed) and send it to server.
68 */
ptlrpc_replay_next(struct obd_import * imp,int * inflight)69 int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
70 {
71 int rc = 0;
72 struct list_head *tmp, *pos;
73 struct ptlrpc_request *req = NULL;
74 __u64 last_transno;
75
76 *inflight = 0;
77
78 /* It might have committed some after we last spoke, so make sure we
79 * get rid of them now.
80 */
81 spin_lock(&imp->imp_lock);
82 imp->imp_last_transno_checked = 0;
83 ptlrpc_free_committed(imp);
84 last_transno = imp->imp_last_replay_transno;
85 spin_unlock(&imp->imp_lock);
86
87 CDEBUG(D_HA, "import %p from %s committed %llu last %llu\n",
88 imp, obd2cli_tgt(imp->imp_obd),
89 imp->imp_peer_committed_transno, last_transno);
90
91 /* Do I need to hold a lock across this iteration? We shouldn't be
92 * racing with any additions to the list, because we're in recovery
93 * and are therefore not processing additional requests to add. Calls
94 * to ptlrpc_free_committed might commit requests, but nothing "newer"
95 * than the one we're replaying (it can't be committed until it's
96 * replayed, and we're doing that here). l_f_e_safe protects against
97 * problems with the current request being committed, in the unlikely
98 * event of that race. So, in conclusion, I think that it's safe to
99 * perform this list-walk without the imp_lock held.
100 *
101 * But, the {mdc,osc}_replay_open callbacks both iterate
102 * request lists, and have comments saying they assume the
103 * imp_lock is being held by ptlrpc_replay, but it's not. it's
104 * just a little race...
105 */
106
107 /* Replay all the committed open requests on committed_list first */
108 if (!list_empty(&imp->imp_committed_list)) {
109 tmp = imp->imp_committed_list.prev;
110 req = list_entry(tmp, struct ptlrpc_request,
111 rq_replay_list);
112
113 /* The last request on committed_list hasn't been replayed */
114 if (req->rq_transno > last_transno) {
115 /* Since the imp_committed_list is immutable before
116 * all of it's requests being replayed, it's safe to
117 * use a cursor to accelerate the search */
118 imp->imp_replay_cursor = imp->imp_replay_cursor->next;
119
120 while (imp->imp_replay_cursor !=
121 &imp->imp_committed_list) {
122 req = list_entry(imp->imp_replay_cursor,
123 struct ptlrpc_request,
124 rq_replay_list);
125 if (req->rq_transno > last_transno)
126 break;
127
128 req = NULL;
129 imp->imp_replay_cursor =
130 imp->imp_replay_cursor->next;
131 }
132 } else {
133 /* All requests on committed_list have been replayed */
134 imp->imp_replay_cursor = &imp->imp_committed_list;
135 req = NULL;
136 }
137 }
138
139 /* All the requests in committed list have been replayed, let's replay
140 * the imp_replay_list */
141 if (req == NULL) {
142 list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
143 req = list_entry(tmp, struct ptlrpc_request,
144 rq_replay_list);
145
146 if (req->rq_transno > last_transno)
147 break;
148 req = NULL;
149 }
150 }
151
152 /* If need to resend the last sent transno (because a reconnect
153 * has occurred), then stop on the matching req and send it again.
154 * If, however, the last sent transno has been committed then we
155 * continue replay from the next request. */
156 if (req != NULL && imp->imp_resend_replay)
157 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
158
159 spin_lock(&imp->imp_lock);
160 imp->imp_resend_replay = 0;
161 spin_unlock(&imp->imp_lock);
162
163 if (req != NULL) {
164 rc = ptlrpc_replay_req(req);
165 if (rc) {
166 CERROR("recovery replay error %d for req %llu\n",
167 rc, req->rq_xid);
168 return rc;
169 }
170 *inflight = 1;
171 }
172 return rc;
173 }
174
175 /**
176 * Schedule resending of request on sending_list. This is done after
177 * we completed replaying of requests and locks.
178 */
ptlrpc_resend(struct obd_import * imp)179 int ptlrpc_resend(struct obd_import *imp)
180 {
181 struct ptlrpc_request *req, *next;
182
183 /* As long as we're in recovery, nothing should be added to the sending
184 * list, so we don't need to hold the lock during this iteration and
185 * resend process.
186 */
187 /* Well... what if lctl recover is called twice at the same time?
188 */
189 spin_lock(&imp->imp_lock);
190 if (imp->imp_state != LUSTRE_IMP_RECOVER) {
191 spin_unlock(&imp->imp_lock);
192 return -1;
193 }
194
195 list_for_each_entry_safe(req, next, &imp->imp_sending_list,
196 rq_list) {
197 LASSERTF((long)req > PAGE_CACHE_SIZE && req != LP_POISON,
198 "req %p bad\n", req);
199 LASSERTF(req->rq_type != LI_POISON, "req %p freed\n", req);
200 if (!ptlrpc_no_resend(req))
201 ptlrpc_resend_req(req);
202 }
203 spin_unlock(&imp->imp_lock);
204
205 return 0;
206 }
207 EXPORT_SYMBOL(ptlrpc_resend);
208
209 /**
210 * Go through all requests in delayed list and wake their threads
211 * for resending
212 */
ptlrpc_wake_delayed(struct obd_import * imp)213 void ptlrpc_wake_delayed(struct obd_import *imp)
214 {
215 struct list_head *tmp, *pos;
216 struct ptlrpc_request *req;
217
218 spin_lock(&imp->imp_lock);
219 list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
220 req = list_entry(tmp, struct ptlrpc_request, rq_list);
221
222 DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
223 ptlrpc_client_wake_req(req);
224 }
225 spin_unlock(&imp->imp_lock);
226 }
227 EXPORT_SYMBOL(ptlrpc_wake_delayed);
228
ptlrpc_request_handle_notconn(struct ptlrpc_request * failed_req)229 void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
230 {
231 struct obd_import *imp = failed_req->rq_import;
232
233 CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
234 imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
235 imp->imp_connection->c_remote_uuid.uuid);
236
237 if (ptlrpc_set_import_discon(imp,
238 lustre_msg_get_conn_cnt(failed_req->rq_reqmsg))) {
239 if (!imp->imp_replayable) {
240 CDEBUG(D_HA, "import %s@%s for %s not replayable, auto-deactivating\n",
241 obd2cli_tgt(imp->imp_obd),
242 imp->imp_connection->c_remote_uuid.uuid,
243 imp->imp_obd->obd_name);
244 ptlrpc_deactivate_import(imp);
245 }
246 /* to control recovery via lctl {disable|enable}_recovery */
247 if (imp->imp_deactive == 0)
248 ptlrpc_connect_import(imp);
249 }
250
251 /* Wait for recovery to complete and resend. If evicted, then
252 this request will be errored out later.*/
253 spin_lock(&failed_req->rq_lock);
254 if (!failed_req->rq_no_resend)
255 failed_req->rq_resend = 1;
256 spin_unlock(&failed_req->rq_lock);
257 }
258
259 /**
260 * Administratively active/deactive a client.
261 * This should only be called by the ioctl interface, currently
262 * - the lctl deactivate and activate commands
263 * - echo 0/1 >> /proc/osc/XXX/active
264 * - client umount -f (ll_umount_begin)
265 */
ptlrpc_set_import_active(struct obd_import * imp,int active)266 int ptlrpc_set_import_active(struct obd_import *imp, int active)
267 {
268 struct obd_device *obd = imp->imp_obd;
269 int rc = 0;
270
271 LASSERT(obd);
272
273 /* When deactivating, mark import invalid, and abort in-flight
274 * requests. */
275 if (!active) {
276 LCONSOLE_WARN("setting import %s INACTIVE by administrator request\n",
277 obd2cli_tgt(imp->imp_obd));
278
279 /* set before invalidate to avoid messages about imp_inval
280 * set without imp_deactive in ptlrpc_import_delay_req */
281 spin_lock(&imp->imp_lock);
282 imp->imp_deactive = 1;
283 spin_unlock(&imp->imp_lock);
284
285 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);
286
287 ptlrpc_invalidate_import(imp);
288 }
289
290 /* When activating, mark import valid, and attempt recovery */
291 if (active) {
292 CDEBUG(D_HA, "setting import %s VALID\n",
293 obd2cli_tgt(imp->imp_obd));
294
295 spin_lock(&imp->imp_lock);
296 imp->imp_deactive = 0;
297 spin_unlock(&imp->imp_lock);
298 obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);
299
300 rc = ptlrpc_recover_import(imp, NULL, 0);
301 }
302
303 return rc;
304 }
305 EXPORT_SYMBOL(ptlrpc_set_import_active);
306
307 /* Attempt to reconnect an import */
ptlrpc_recover_import(struct obd_import * imp,char * new_uuid,int async)308 int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
309 {
310 int rc = 0;
311
312 spin_lock(&imp->imp_lock);
313 if (imp->imp_state == LUSTRE_IMP_NEW || imp->imp_deactive ||
314 atomic_read(&imp->imp_inval_count))
315 rc = -EINVAL;
316 spin_unlock(&imp->imp_lock);
317 if (rc)
318 goto out;
319
320 /* force import to be disconnected. */
321 ptlrpc_set_import_discon(imp, 0);
322
323 if (new_uuid) {
324 struct obd_uuid uuid;
325
326 /* intruct import to use new uuid */
327 obd_str2uuid(&uuid, new_uuid);
328 rc = import_set_conn_priority(imp, &uuid);
329 if (rc)
330 goto out;
331 }
332
333 /* Check if reconnect is already in progress */
334 spin_lock(&imp->imp_lock);
335 if (imp->imp_state != LUSTRE_IMP_DISCON) {
336 imp->imp_force_verify = 1;
337 rc = -EALREADY;
338 }
339 spin_unlock(&imp->imp_lock);
340 if (rc)
341 goto out;
342
343 rc = ptlrpc_connect_import(imp);
344 if (rc)
345 goto out;
346
347 if (!async) {
348 struct l_wait_info lwi;
349 int secs = cfs_time_seconds(obd_timeout);
350
351 CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
352 obd2cli_tgt(imp->imp_obd), secs);
353
354 lwi = LWI_TIMEOUT(secs, NULL, NULL);
355 rc = l_wait_event(imp->imp_recovery_waitq,
356 !ptlrpc_import_in_recovery(imp), &lwi);
357 CDEBUG(D_HA, "%s: recovery finished\n",
358 obd2cli_tgt(imp->imp_obd));
359 }
360
361 out:
362 return rc;
363 }
364 EXPORT_SYMBOL(ptlrpc_recover_import);
365
ptlrpc_import_in_recovery(struct obd_import * imp)366 int ptlrpc_import_in_recovery(struct obd_import *imp)
367 {
368 int in_recovery = 1;
369
370 spin_lock(&imp->imp_lock);
371 if (imp->imp_state == LUSTRE_IMP_FULL ||
372 imp->imp_state == LUSTRE_IMP_CLOSED ||
373 imp->imp_state == LUSTRE_IMP_DISCON ||
374 imp->imp_obd->obd_no_recov)
375 in_recovery = 0;
376 spin_unlock(&imp->imp_lock);
377
378 return in_recovery;
379 }
380