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Merge branch 'for-4.5/lightnvm' of git://git.kernel.dk/linux-block
[deliverable/linux.git] / drivers / staging / lustre / lustre / ptlrpc / import.c
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) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2015, 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/import.c
37 *
38 * Author: Mike Shaver <shaver@clusterfs.com>
39 */
40
41 #define DEBUG_SUBSYSTEM S_RPC
42
43 #include "../include/obd_support.h"
44 #include "../include/lustre_ha.h"
45 #include "../include/lustre_net.h"
46 #include "../include/lustre_import.h"
47 #include "../include/lustre_export.h"
48 #include "../include/obd.h"
49 #include "../include/obd_cksum.h"
50 #include "../include/obd_class.h"
51
52 #include "ptlrpc_internal.h"
53
54 struct ptlrpc_connect_async_args {
55 __u64 pcaa_peer_committed;
56 int pcaa_initial_connect;
57 };
58
59 /**
60 * Updates import \a imp current state to provided \a state value
61 * Helper function. Must be called under imp_lock.
62 */
63 static void __import_set_state(struct obd_import *imp,
64 enum lustre_imp_state state)
65 {
66 switch (state) {
67 case LUSTRE_IMP_CLOSED:
68 case LUSTRE_IMP_NEW:
69 case LUSTRE_IMP_DISCON:
70 case LUSTRE_IMP_CONNECTING:
71 break;
72 case LUSTRE_IMP_REPLAY_WAIT:
73 imp->imp_replay_state = LUSTRE_IMP_REPLAY_LOCKS;
74 break;
75 default:
76 imp->imp_replay_state = LUSTRE_IMP_REPLAY;
77 }
78
79 imp->imp_state = state;
80 imp->imp_state_hist[imp->imp_state_hist_idx].ish_state = state;
81 imp->imp_state_hist[imp->imp_state_hist_idx].ish_time =
82 ktime_get_real_seconds();
83 imp->imp_state_hist_idx = (imp->imp_state_hist_idx + 1) %
84 IMP_STATE_HIST_LEN;
85 }
86
87 /* A CLOSED import should remain so. */
88 #define IMPORT_SET_STATE_NOLOCK(imp, state) \
89 do { \
90 if (imp->imp_state != LUSTRE_IMP_CLOSED) { \
91 CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n", \
92 imp, obd2cli_tgt(imp->imp_obd), \
93 ptlrpc_import_state_name(imp->imp_state), \
94 ptlrpc_import_state_name(state)); \
95 __import_set_state(imp, state); \
96 } \
97 } while (0)
98
99 #define IMPORT_SET_STATE(imp, state) \
100 do { \
101 spin_lock(&imp->imp_lock); \
102 IMPORT_SET_STATE_NOLOCK(imp, state); \
103 spin_unlock(&imp->imp_lock); \
104 } while (0)
105
106 static int ptlrpc_connect_interpret(const struct lu_env *env,
107 struct ptlrpc_request *request,
108 void *data, int rc);
109 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
110
111 /* Only this function is allowed to change the import state when it is
112 * CLOSED. I would rather refcount the import and free it after
113 * disconnection like we do with exports. To do that, the client_obd
114 * will need to save the peer info somewhere other than in the import,
115 * though. */
116 int ptlrpc_init_import(struct obd_import *imp)
117 {
118 spin_lock(&imp->imp_lock);
119
120 imp->imp_generation++;
121 imp->imp_state = LUSTRE_IMP_NEW;
122
123 spin_unlock(&imp->imp_lock);
124
125 return 0;
126 }
127 EXPORT_SYMBOL(ptlrpc_init_import);
128
129 #define UUID_STR "_UUID"
130 static void deuuidify(char *uuid, const char *prefix, char **uuid_start,
131 int *uuid_len)
132 {
133 *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
134 ? uuid : uuid + strlen(prefix);
135
136 *uuid_len = strlen(*uuid_start);
137
138 if (*uuid_len < strlen(UUID_STR))
139 return;
140
141 if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
142 UUID_STR, strlen(UUID_STR)))
143 *uuid_len -= strlen(UUID_STR);
144 }
145
146 /**
147 * Returns true if import was FULL, false if import was already not
148 * connected.
149 * @imp - import to be disconnected
150 * @conn_cnt - connection count (epoch) of the request that timed out
151 * and caused the disconnection. In some cases, multiple
152 * inflight requests can fail to a single target (e.g. OST
153 * bulk requests) and if one has already caused a reconnection
154 * (increasing the import->conn_cnt) the older failure should
155 * not also cause a reconnection. If zero it forces a reconnect.
156 */
157 int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
158 {
159 int rc = 0;
160
161 spin_lock(&imp->imp_lock);
162
163 if (imp->imp_state == LUSTRE_IMP_FULL &&
164 (conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
165 char *target_start;
166 int target_len;
167
168 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
169 &target_start, &target_len);
170
171 if (imp->imp_replayable) {
172 LCONSOLE_WARN("%s: Connection to %.*s (at %s) was lost; in progress operations using this service will wait for recovery to complete\n",
173 imp->imp_obd->obd_name, target_len, target_start,
174 libcfs_nid2str(imp->imp_connection->c_peer.nid));
175 } else {
176 LCONSOLE_ERROR_MSG(0x166, "%s: Connection to %.*s (at %s) was lost; in progress operations using this service will fail\n",
177 imp->imp_obd->obd_name,
178 target_len, target_start,
179 libcfs_nid2str(imp->imp_connection->c_peer.nid));
180 }
181 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
182 spin_unlock(&imp->imp_lock);
183
184 if (obd_dump_on_timeout)
185 libcfs_debug_dumplog();
186
187 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
188 rc = 1;
189 } else {
190 spin_unlock(&imp->imp_lock);
191 CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
192 imp->imp_client->cli_name, imp,
193 (imp->imp_state == LUSTRE_IMP_FULL &&
194 imp->imp_conn_cnt > conn_cnt) ?
195 "reconnected" : "not connected", imp->imp_conn_cnt,
196 conn_cnt, ptlrpc_import_state_name(imp->imp_state));
197 }
198
199 return rc;
200 }
201
202 /*
203 * This acts as a barrier; all existing requests are rejected, and
204 * no new requests will be accepted until the import is valid again.
205 */
206 void ptlrpc_deactivate_import(struct obd_import *imp)
207 {
208 CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
209
210 spin_lock(&imp->imp_lock);
211 imp->imp_invalid = 1;
212 imp->imp_generation++;
213 spin_unlock(&imp->imp_lock);
214
215 ptlrpc_abort_inflight(imp);
216 obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
217 }
218 EXPORT_SYMBOL(ptlrpc_deactivate_import);
219
220 static unsigned int
221 ptlrpc_inflight_deadline(struct ptlrpc_request *req, time64_t now)
222 {
223 long dl;
224
225 if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
226 (req->rq_phase == RQ_PHASE_BULK) ||
227 (req->rq_phase == RQ_PHASE_NEW)))
228 return 0;
229
230 if (req->rq_timedout)
231 return 0;
232
233 if (req->rq_phase == RQ_PHASE_NEW)
234 dl = req->rq_sent;
235 else
236 dl = req->rq_deadline;
237
238 if (dl <= now)
239 return 0;
240
241 return dl - now;
242 }
243
244 static unsigned int ptlrpc_inflight_timeout(struct obd_import *imp)
245 {
246 time64_t now = ktime_get_real_seconds();
247 struct list_head *tmp, *n;
248 struct ptlrpc_request *req;
249 unsigned int timeout = 0;
250
251 spin_lock(&imp->imp_lock);
252 list_for_each_safe(tmp, n, &imp->imp_sending_list) {
253 req = list_entry(tmp, struct ptlrpc_request, rq_list);
254 timeout = max(ptlrpc_inflight_deadline(req, now), timeout);
255 }
256 spin_unlock(&imp->imp_lock);
257 return timeout;
258 }
259
260 /**
261 * This function will invalidate the import, if necessary, then block
262 * for all the RPC completions, and finally notify the obd to
263 * invalidate its state (ie cancel locks, clear pending requests,
264 * etc).
265 */
266 void ptlrpc_invalidate_import(struct obd_import *imp)
267 {
268 struct list_head *tmp, *n;
269 struct ptlrpc_request *req;
270 struct l_wait_info lwi;
271 unsigned int timeout;
272 int rc;
273
274 atomic_inc(&imp->imp_inval_count);
275
276 if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
277 ptlrpc_deactivate_import(imp);
278
279 CFS_FAIL_TIMEOUT(OBD_FAIL_MGS_CONNECT_NET, 3 * cfs_fail_val / 2);
280 LASSERT(imp->imp_invalid);
281
282 /* Wait forever until inflight == 0. We really can't do it another
283 * way because in some cases we need to wait for very long reply
284 * unlink. We can't do anything before that because there is really
285 * no guarantee that some rdma transfer is not in progress right now. */
286 do {
287 /* Calculate max timeout for waiting on rpcs to error
288 * out. Use obd_timeout if calculated value is smaller
289 * than it. */
290 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
291 timeout = ptlrpc_inflight_timeout(imp);
292 timeout += timeout / 3;
293
294 if (timeout == 0)
295 timeout = obd_timeout;
296 } else {
297 /* decrease the interval to increase race condition */
298 timeout = 1;
299 }
300
301 CDEBUG(D_RPCTRACE,
302 "Sleeping %d sec for inflight to error out\n",
303 timeout);
304
305 /* Wait for all requests to error out and call completion
306 * callbacks. Cap it at obd_timeout -- these should all
307 * have been locally cancelled by ptlrpc_abort_inflight. */
308 lwi = LWI_TIMEOUT_INTERVAL(
309 cfs_timeout_cap(cfs_time_seconds(timeout)),
310 (timeout > 1)?cfs_time_seconds(1):cfs_time_seconds(1)/2,
311 NULL, NULL);
312 rc = l_wait_event(imp->imp_recovery_waitq,
313 (atomic_read(&imp->imp_inflight) == 0),
314 &lwi);
315 if (rc) {
316 const char *cli_tgt = obd2cli_tgt(imp->imp_obd);
317
318 CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
319 cli_tgt, rc,
320 atomic_read(&imp->imp_inflight));
321
322 spin_lock(&imp->imp_lock);
323 if (atomic_read(&imp->imp_inflight) == 0) {
324 int count = atomic_read(&imp->imp_unregistering);
325
326 /* We know that "unregistering" rpcs only can
327 * survive in sending or delaying lists (they
328 * maybe waiting for long reply unlink in
329 * sluggish nets). Let's check this. If there
330 * is no inflight and unregistering != 0, this
331 * is bug. */
332 LASSERTF(count == 0, "Some RPCs are still unregistering: %d\n",
333 count);
334
335 /* Let's save one loop as soon as inflight have
336 * dropped to zero. No new inflights possible at
337 * this point. */
338 rc = 0;
339 } else {
340 list_for_each_safe(tmp, n,
341 &imp->imp_sending_list) {
342 req = list_entry(tmp,
343 struct ptlrpc_request,
344 rq_list);
345 DEBUG_REQ(D_ERROR, req,
346 "still on sending list");
347 }
348 list_for_each_safe(tmp, n,
349 &imp->imp_delayed_list) {
350 req = list_entry(tmp,
351 struct ptlrpc_request,
352 rq_list);
353 DEBUG_REQ(D_ERROR, req,
354 "still on delayed list");
355 }
356
357 CERROR("%s: RPCs in \"%s\" phase found (%d). Network is sluggish? Waiting them to error out.\n",
358 cli_tgt,
359 ptlrpc_phase2str(RQ_PHASE_UNREGISTERING),
360 atomic_read(&imp->
361 imp_unregistering));
362 }
363 spin_unlock(&imp->imp_lock);
364 }
365 } while (rc != 0);
366
367 /*
368 * Let's additionally check that no new rpcs added to import in
369 * "invalidate" state.
370 */
371 LASSERT(atomic_read(&imp->imp_inflight) == 0);
372 obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
373 sptlrpc_import_flush_all_ctx(imp);
374
375 atomic_dec(&imp->imp_inval_count);
376 wake_up_all(&imp->imp_recovery_waitq);
377 }
378 EXPORT_SYMBOL(ptlrpc_invalidate_import);
379
380 /* unset imp_invalid */
381 void ptlrpc_activate_import(struct obd_import *imp)
382 {
383 struct obd_device *obd = imp->imp_obd;
384
385 spin_lock(&imp->imp_lock);
386 if (imp->imp_deactive != 0) {
387 spin_unlock(&imp->imp_lock);
388 return;
389 }
390
391 imp->imp_invalid = 0;
392 spin_unlock(&imp->imp_lock);
393 obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
394 }
395 EXPORT_SYMBOL(ptlrpc_activate_import);
396
397 static void ptlrpc_pinger_force(struct obd_import *imp)
398 {
399 CDEBUG(D_HA, "%s: waking up pinger s:%s\n", obd2cli_tgt(imp->imp_obd),
400 ptlrpc_import_state_name(imp->imp_state));
401
402 spin_lock(&imp->imp_lock);
403 imp->imp_force_verify = 1;
404 spin_unlock(&imp->imp_lock);
405
406 if (imp->imp_state != LUSTRE_IMP_CONNECTING)
407 ptlrpc_pinger_wake_up();
408 }
409
410 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
411 {
412 LASSERT(!imp->imp_dlm_fake);
413
414 if (ptlrpc_set_import_discon(imp, conn_cnt)) {
415 if (!imp->imp_replayable) {
416 CDEBUG(D_HA, "import %s@%s for %s not replayable, auto-deactivating\n",
417 obd2cli_tgt(imp->imp_obd),
418 imp->imp_connection->c_remote_uuid.uuid,
419 imp->imp_obd->obd_name);
420 ptlrpc_deactivate_import(imp);
421 }
422
423 ptlrpc_pinger_force(imp);
424 }
425 }
426 EXPORT_SYMBOL(ptlrpc_fail_import);
427
428 int ptlrpc_reconnect_import(struct obd_import *imp)
429 {
430 #ifdef ENABLE_PINGER
431 struct l_wait_info lwi;
432 int secs = cfs_time_seconds(obd_timeout);
433 int rc;
434
435 ptlrpc_pinger_force(imp);
436
437 CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
438 obd2cli_tgt(imp->imp_obd), secs);
439
440 lwi = LWI_TIMEOUT(secs, NULL, NULL);
441 rc = l_wait_event(imp->imp_recovery_waitq,
442 !ptlrpc_import_in_recovery(imp), &lwi);
443 CDEBUG(D_HA, "%s: recovery finished s:%s\n", obd2cli_tgt(imp->imp_obd),
444 ptlrpc_import_state_name(imp->imp_state));
445 return rc;
446 #else
447 ptlrpc_set_import_discon(imp, 0);
448 /* Force a new connect attempt */
449 ptlrpc_invalidate_import(imp);
450 /* Do a fresh connect next time by zeroing the handle */
451 ptlrpc_disconnect_import(imp, 1);
452 /* Wait for all invalidate calls to finish */
453 if (atomic_read(&imp->imp_inval_count) > 0) {
454 int rc;
455 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
456
457 rc = l_wait_event(imp->imp_recovery_waitq,
458 (atomic_read(&imp->imp_inval_count) == 0),
459 &lwi);
460 if (rc)
461 CERROR("Interrupted, inval=%d\n",
462 atomic_read(&imp->imp_inval_count));
463 }
464
465 /* Allow reconnect attempts */
466 imp->imp_obd->obd_no_recov = 0;
467 /* Remove 'invalid' flag */
468 ptlrpc_activate_import(imp);
469 /* Attempt a new connect */
470 ptlrpc_recover_import(imp, NULL, 0);
471 return 0;
472 #endif
473 }
474 EXPORT_SYMBOL(ptlrpc_reconnect_import);
475
476 /**
477 * Connection on import \a imp is changed to another one (if more than one is
478 * present). We typically chose connection that we have not tried to connect to
479 * the longest
480 */
481 static int import_select_connection(struct obd_import *imp)
482 {
483 struct obd_import_conn *imp_conn = NULL, *conn;
484 struct obd_export *dlmexp;
485 char *target_start;
486 int target_len, tried_all = 1;
487
488 spin_lock(&imp->imp_lock);
489
490 if (list_empty(&imp->imp_conn_list)) {
491 CERROR("%s: no connections available\n",
492 imp->imp_obd->obd_name);
493 spin_unlock(&imp->imp_lock);
494 return -EINVAL;
495 }
496
497 list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
498 CDEBUG(D_HA, "%s: connect to NID %s last attempt %llu\n",
499 imp->imp_obd->obd_name,
500 libcfs_nid2str(conn->oic_conn->c_peer.nid),
501 conn->oic_last_attempt);
502
503 /* If we have not tried this connection since
504 the last successful attempt, go with this one */
505 if ((conn->oic_last_attempt == 0) ||
506 cfs_time_beforeq_64(conn->oic_last_attempt,
507 imp->imp_last_success_conn)) {
508 imp_conn = conn;
509 tried_all = 0;
510 break;
511 }
512
513 /* If all of the connections have already been tried
514 since the last successful connection; just choose the
515 least recently used */
516 if (!imp_conn)
517 imp_conn = conn;
518 else if (cfs_time_before_64(conn->oic_last_attempt,
519 imp_conn->oic_last_attempt))
520 imp_conn = conn;
521 }
522
523 /* if not found, simply choose the current one */
524 if (!imp_conn || imp->imp_force_reconnect) {
525 LASSERT(imp->imp_conn_current);
526 imp_conn = imp->imp_conn_current;
527 tried_all = 0;
528 }
529 LASSERT(imp_conn->oic_conn);
530
531 /* If we've tried everything, and we're back to the beginning of the
532 list, increase our timeout and try again. It will be reset when
533 we do finally connect. (FIXME: really we should wait for all network
534 state associated with the last connection attempt to drain before
535 trying to reconnect on it.) */
536 if (tried_all && (imp->imp_conn_list.next == &imp_conn->oic_item)) {
537 struct adaptive_timeout *at = &imp->imp_at.iat_net_latency;
538
539 if (at_get(at) < CONNECTION_SWITCH_MAX) {
540 at_measured(at, at_get(at) + CONNECTION_SWITCH_INC);
541 if (at_get(at) > CONNECTION_SWITCH_MAX)
542 at_reset(at, CONNECTION_SWITCH_MAX);
543 }
544 LASSERT(imp_conn->oic_last_attempt);
545 CDEBUG(D_HA, "%s: tried all connections, increasing latency to %ds\n",
546 imp->imp_obd->obd_name, at_get(at));
547 }
548
549 imp_conn->oic_last_attempt = cfs_time_current_64();
550
551 /* switch connection, don't mind if it's same as the current one */
552 ptlrpc_connection_put(imp->imp_connection);
553 imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
554
555 dlmexp = class_conn2export(&imp->imp_dlm_handle);
556 LASSERT(dlmexp != NULL);
557 ptlrpc_connection_put(dlmexp->exp_connection);
558 dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
559 class_export_put(dlmexp);
560
561 if (imp->imp_conn_current != imp_conn) {
562 if (imp->imp_conn_current) {
563 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
564 &target_start, &target_len);
565
566 CDEBUG(D_HA, "%s: Connection changing to %.*s (at %s)\n",
567 imp->imp_obd->obd_name,
568 target_len, target_start,
569 libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
570 }
571
572 imp->imp_conn_current = imp_conn;
573 }
574
575 CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
576 imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
577 libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
578
579 spin_unlock(&imp->imp_lock);
580
581 return 0;
582 }
583
584 /*
585 * must be called under imp_lock
586 */
587 static int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
588 {
589 struct ptlrpc_request *req;
590 struct list_head *tmp;
591
592 /* The requests in committed_list always have smaller transnos than
593 * the requests in replay_list */
594 if (!list_empty(&imp->imp_committed_list)) {
595 tmp = imp->imp_committed_list.next;
596 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
597 *transno = req->rq_transno;
598 if (req->rq_transno == 0) {
599 DEBUG_REQ(D_ERROR, req,
600 "zero transno in committed_list");
601 LBUG();
602 }
603 return 1;
604 }
605 if (!list_empty(&imp->imp_replay_list)) {
606 tmp = imp->imp_replay_list.next;
607 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
608 *transno = req->rq_transno;
609 if (req->rq_transno == 0) {
610 DEBUG_REQ(D_ERROR, req, "zero transno in replay_list");
611 LBUG();
612 }
613 return 1;
614 }
615 return 0;
616 }
617
618 /**
619 * Attempt to (re)connect import \a imp. This includes all preparations,
620 * initializing CONNECT RPC request and passing it to ptlrpcd for
621 * actual sending.
622 * Returns 0 on success or error code.
623 */
624 int ptlrpc_connect_import(struct obd_import *imp)
625 {
626 struct obd_device *obd = imp->imp_obd;
627 int initial_connect = 0;
628 int set_transno = 0;
629 __u64 committed_before_reconnect = 0;
630 struct ptlrpc_request *request;
631 char *bufs[] = { NULL,
632 obd2cli_tgt(imp->imp_obd),
633 obd->obd_uuid.uuid,
634 (char *)&imp->imp_dlm_handle,
635 (char *)&imp->imp_connect_data };
636 struct ptlrpc_connect_async_args *aa;
637 int rc;
638
639 spin_lock(&imp->imp_lock);
640 if (imp->imp_state == LUSTRE_IMP_CLOSED) {
641 spin_unlock(&imp->imp_lock);
642 CERROR("can't connect to a closed import\n");
643 return -EINVAL;
644 } else if (imp->imp_state == LUSTRE_IMP_FULL) {
645 spin_unlock(&imp->imp_lock);
646 CERROR("already connected\n");
647 return 0;
648 } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
649 spin_unlock(&imp->imp_lock);
650 CERROR("already connecting\n");
651 return -EALREADY;
652 }
653
654 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
655
656 imp->imp_conn_cnt++;
657 imp->imp_resend_replay = 0;
658
659 if (!lustre_handle_is_used(&imp->imp_remote_handle))
660 initial_connect = 1;
661 else
662 committed_before_reconnect = imp->imp_peer_committed_transno;
663
664 set_transno = ptlrpc_first_transno(imp,
665 &imp->imp_connect_data.ocd_transno);
666 spin_unlock(&imp->imp_lock);
667
668 rc = import_select_connection(imp);
669 if (rc)
670 goto out;
671
672 rc = sptlrpc_import_sec_adapt(imp, NULL, NULL);
673 if (rc)
674 goto out;
675
676 /* Reset connect flags to the originally requested flags, in case
677 * the server is updated on-the-fly we will get the new features. */
678 imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
679 /* Reset ocd_version each time so the server knows the exact versions */
680 imp->imp_connect_data.ocd_version = LUSTRE_VERSION_CODE;
681 imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
682 imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
683
684 rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
685 &obd->obd_uuid, &imp->imp_connect_data, NULL);
686 if (rc)
687 goto out;
688
689 request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
690 if (request == NULL) {
691 rc = -ENOMEM;
692 goto out;
693 }
694
695 rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
696 imp->imp_connect_op, bufs, NULL);
697 if (rc) {
698 ptlrpc_request_free(request);
699 goto out;
700 }
701
702 /* Report the rpc service time to the server so that it knows how long
703 * to wait for clients to join recovery */
704 lustre_msg_set_service_time(request->rq_reqmsg,
705 at_timeout2est(request->rq_timeout));
706
707 /* The amount of time we give the server to process the connect req.
708 * import_select_connection will increase the net latency on
709 * repeated reconnect attempts to cover slow networks.
710 * We override/ignore the server rpc completion estimate here,
711 * which may be large if this is a reconnect attempt */
712 request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
713 lustre_msg_set_timeout(request->rq_reqmsg, request->rq_timeout);
714
715 lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
716
717 request->rq_no_resend = request->rq_no_delay = 1;
718 request->rq_send_state = LUSTRE_IMP_CONNECTING;
719 /* Allow a slightly larger reply for future growth compatibility */
720 req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
721 sizeof(struct obd_connect_data)+16*sizeof(__u64));
722 ptlrpc_request_set_replen(request);
723 request->rq_interpret_reply = ptlrpc_connect_interpret;
724
725 CLASSERT(sizeof(*aa) <= sizeof(request->rq_async_args));
726 aa = ptlrpc_req_async_args(request);
727 memset(aa, 0, sizeof(*aa));
728
729 aa->pcaa_peer_committed = committed_before_reconnect;
730 aa->pcaa_initial_connect = initial_connect;
731
732 if (aa->pcaa_initial_connect) {
733 spin_lock(&imp->imp_lock);
734 imp->imp_replayable = 1;
735 spin_unlock(&imp->imp_lock);
736 lustre_msg_add_op_flags(request->rq_reqmsg,
737 MSG_CONNECT_INITIAL);
738 }
739
740 if (set_transno)
741 lustre_msg_add_op_flags(request->rq_reqmsg,
742 MSG_CONNECT_TRANSNO);
743
744 DEBUG_REQ(D_RPCTRACE, request, "(re)connect request (timeout %d)",
745 request->rq_timeout);
746 ptlrpcd_add_req(request);
747 rc = 0;
748 out:
749 if (rc != 0)
750 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
751
752 return rc;
753 }
754 EXPORT_SYMBOL(ptlrpc_connect_import);
755
756 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
757 {
758 int force_verify;
759
760 spin_lock(&imp->imp_lock);
761 force_verify = imp->imp_force_verify != 0;
762 spin_unlock(&imp->imp_lock);
763
764 if (force_verify)
765 ptlrpc_pinger_wake_up();
766 }
767
768 static int ptlrpc_busy_reconnect(int rc)
769 {
770 return (rc == -EBUSY) || (rc == -EAGAIN);
771 }
772
773 /**
774 * interpret_reply callback for connect RPCs.
775 * Looks into returned status of connect operation and decides
776 * what to do with the import - i.e enter recovery, promote it to
777 * full state for normal operations of disconnect it due to an error.
778 */
779 static int ptlrpc_connect_interpret(const struct lu_env *env,
780 struct ptlrpc_request *request,
781 void *data, int rc)
782 {
783 struct ptlrpc_connect_async_args *aa = data;
784 struct obd_import *imp = request->rq_import;
785 struct client_obd *cli = &imp->imp_obd->u.cli;
786 struct lustre_handle old_hdl;
787 __u64 old_connect_flags;
788 int msg_flags;
789 struct obd_connect_data *ocd;
790 struct obd_export *exp;
791 int ret;
792
793 spin_lock(&imp->imp_lock);
794 if (imp->imp_state == LUSTRE_IMP_CLOSED) {
795 imp->imp_connect_tried = 1;
796 spin_unlock(&imp->imp_lock);
797 return 0;
798 }
799
800 if (rc) {
801 /* if this reconnect to busy export - not need select new target
802 * for connecting*/
803 imp->imp_force_reconnect = ptlrpc_busy_reconnect(rc);
804 spin_unlock(&imp->imp_lock);
805 ptlrpc_maybe_ping_import_soon(imp);
806 goto out;
807 }
808 spin_unlock(&imp->imp_lock);
809
810 LASSERT(imp->imp_conn_current);
811
812 msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
813
814 ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
815 RCL_SERVER);
816 /* server replied obd_connect_data is always bigger */
817 ocd = req_capsule_server_sized_get(&request->rq_pill,
818 &RMF_CONNECT_DATA, ret);
819
820 if (ocd == NULL) {
821 CERROR("%s: no connect data from server\n",
822 imp->imp_obd->obd_name);
823 rc = -EPROTO;
824 goto out;
825 }
826
827 spin_lock(&imp->imp_lock);
828
829 /* All imports are pingable */
830 imp->imp_pingable = 1;
831 imp->imp_force_reconnect = 0;
832 imp->imp_force_verify = 0;
833
834 imp->imp_connect_data = *ocd;
835
836 CDEBUG(D_HA, "%s: connect to target with instance %u\n",
837 imp->imp_obd->obd_name, ocd->ocd_instance);
838 exp = class_conn2export(&imp->imp_dlm_handle);
839
840 spin_unlock(&imp->imp_lock);
841
842 /* check that server granted subset of flags we asked for. */
843 if ((ocd->ocd_connect_flags & imp->imp_connect_flags_orig) !=
844 ocd->ocd_connect_flags) {
845 CERROR("%s: Server didn't granted asked subset of flags: asked=%#llx grranted=%#llx\n",
846 imp->imp_obd->obd_name, imp->imp_connect_flags_orig,
847 ocd->ocd_connect_flags);
848 rc = -EPROTO;
849 goto out;
850 }
851
852 if (!exp) {
853 /* This could happen if export is cleaned during the
854 connect attempt */
855 CERROR("%s: missing export after connect\n",
856 imp->imp_obd->obd_name);
857 rc = -ENODEV;
858 goto out;
859 }
860 old_connect_flags = exp_connect_flags(exp);
861 exp->exp_connect_data = *ocd;
862 imp->imp_obd->obd_self_export->exp_connect_data = *ocd;
863 class_export_put(exp);
864
865 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
866
867 if (aa->pcaa_initial_connect) {
868 spin_lock(&imp->imp_lock);
869 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
870 imp->imp_replayable = 1;
871 spin_unlock(&imp->imp_lock);
872 CDEBUG(D_HA, "connected to replayable target: %s\n",
873 obd2cli_tgt(imp->imp_obd));
874 } else {
875 imp->imp_replayable = 0;
876 spin_unlock(&imp->imp_lock);
877 }
878
879 /* if applies, adjust the imp->imp_msg_magic here
880 * according to reply flags */
881
882 imp->imp_remote_handle =
883 *lustre_msg_get_handle(request->rq_repmsg);
884
885 /* Initial connects are allowed for clients with non-random
886 * uuids when servers are in recovery. Simply signal the
887 * servers replay is complete and wait in REPLAY_WAIT. */
888 if (msg_flags & MSG_CONNECT_RECOVERING) {
889 CDEBUG(D_HA, "connect to %s during recovery\n",
890 obd2cli_tgt(imp->imp_obd));
891 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
892 } else {
893 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
894 ptlrpc_activate_import(imp);
895 }
896
897 rc = 0;
898 goto finish;
899 }
900
901 /* Determine what recovery state to move the import to. */
902 if (msg_flags & MSG_CONNECT_RECONNECT) {
903 memset(&old_hdl, 0, sizeof(old_hdl));
904 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
905 sizeof(old_hdl))) {
906 LCONSOLE_WARN("Reconnect to %s (at @%s) failed due bad handle %#llx\n",
907 obd2cli_tgt(imp->imp_obd),
908 imp->imp_connection->c_remote_uuid.uuid,
909 imp->imp_dlm_handle.cookie);
910 rc = -ENOTCONN;
911 goto out;
912 }
913
914 if (memcmp(&imp->imp_remote_handle,
915 lustre_msg_get_handle(request->rq_repmsg),
916 sizeof(imp->imp_remote_handle))) {
917 int level = msg_flags & MSG_CONNECT_RECOVERING ?
918 D_HA : D_WARNING;
919
920 /* Bug 16611/14775: if server handle have changed,
921 * that means some sort of disconnection happened.
922 * If the server is not in recovery, that also means it
923 * already erased all of our state because of previous
924 * eviction. If it is in recovery - we are safe to
925 * participate since we can reestablish all of our state
926 * with server again */
927 if ((msg_flags & MSG_CONNECT_RECOVERING)) {
928 CDEBUG(level, "%s@%s changed server handle from %#llx to %#llx but is still in recovery\n",
929 obd2cli_tgt(imp->imp_obd),
930 imp->imp_connection->c_remote_uuid.uuid,
931 imp->imp_remote_handle.cookie,
932 lustre_msg_get_handle(
933 request->rq_repmsg)->cookie);
934 } else {
935 LCONSOLE_WARN("Evicted from %s (at %s) after server handle changed from %#llx to %#llx\n",
936 obd2cli_tgt(imp->imp_obd),
937 imp->imp_connection-> \
938 c_remote_uuid.uuid,
939 imp->imp_remote_handle.cookie,
940 lustre_msg_get_handle(
941 request->rq_repmsg)->cookie);
942 }
943
944 imp->imp_remote_handle =
945 *lustre_msg_get_handle(request->rq_repmsg);
946
947 if (!(msg_flags & MSG_CONNECT_RECOVERING)) {
948 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
949 rc = 0;
950 goto finish;
951 }
952
953 } else {
954 CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
955 obd2cli_tgt(imp->imp_obd),
956 imp->imp_connection->c_remote_uuid.uuid);
957 }
958
959 if (imp->imp_invalid) {
960 CDEBUG(D_HA, "%s: reconnected but import is invalid; marking evicted\n",
961 imp->imp_obd->obd_name);
962 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
963 } else if (msg_flags & MSG_CONNECT_RECOVERING) {
964 CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
965 imp->imp_obd->obd_name,
966 obd2cli_tgt(imp->imp_obd));
967
968 spin_lock(&imp->imp_lock);
969 imp->imp_resend_replay = 1;
970 spin_unlock(&imp->imp_lock);
971
972 IMPORT_SET_STATE(imp, imp->imp_replay_state);
973 } else {
974 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
975 }
976 } else if ((msg_flags & MSG_CONNECT_RECOVERING) && !imp->imp_invalid) {
977 LASSERT(imp->imp_replayable);
978 imp->imp_remote_handle =
979 *lustre_msg_get_handle(request->rq_repmsg);
980 imp->imp_last_replay_transno = 0;
981 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
982 } else {
983 DEBUG_REQ(D_HA, request, "%s: evicting (reconnect/recover flags not set: %x)",
984 imp->imp_obd->obd_name, msg_flags);
985 imp->imp_remote_handle =
986 *lustre_msg_get_handle(request->rq_repmsg);
987 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
988 }
989
990 /* Sanity checks for a reconnected import. */
991 if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
992 CERROR("imp_replayable flag does not match server after reconnect. We should LBUG right here.\n");
993 }
994
995 if (lustre_msg_get_last_committed(request->rq_repmsg) > 0 &&
996 lustre_msg_get_last_committed(request->rq_repmsg) <
997 aa->pcaa_peer_committed) {
998 CERROR("%s went back in time (transno %lld was previously committed, server now claims %lld)! See https://bugzilla.lustre.org/show_bug.cgi?id=9646\n",
999 obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
1000 lustre_msg_get_last_committed(request->rq_repmsg));
1001 }
1002
1003 finish:
1004 rc = ptlrpc_import_recovery_state_machine(imp);
1005 if (rc != 0) {
1006 if (rc == -ENOTCONN) {
1007 CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery; invalidating and reconnecting\n",
1008 obd2cli_tgt(imp->imp_obd),
1009 imp->imp_connection->c_remote_uuid.uuid);
1010 ptlrpc_connect_import(imp);
1011 imp->imp_connect_tried = 1;
1012 return 0;
1013 }
1014 } else {
1015
1016 spin_lock(&imp->imp_lock);
1017 list_del(&imp->imp_conn_current->oic_item);
1018 list_add(&imp->imp_conn_current->oic_item,
1019 &imp->imp_conn_list);
1020 imp->imp_last_success_conn =
1021 imp->imp_conn_current->oic_last_attempt;
1022
1023 spin_unlock(&imp->imp_lock);
1024
1025 if ((imp->imp_connect_flags_orig & OBD_CONNECT_IBITS) &&
1026 !(ocd->ocd_connect_flags & OBD_CONNECT_IBITS)) {
1027 LCONSOLE_WARN("%s: MDS %s does not support ibits lock, either very old or invalid: requested %llx, replied %llx\n",
1028 imp->imp_obd->obd_name,
1029 imp->imp_connection->c_remote_uuid.uuid,
1030 imp->imp_connect_flags_orig,
1031 ocd->ocd_connect_flags);
1032 rc = -EPROTO;
1033 goto out;
1034 }
1035
1036 if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1037 (ocd->ocd_version > LUSTRE_VERSION_CODE +
1038 LUSTRE_VERSION_OFFSET_WARN ||
1039 ocd->ocd_version < LUSTRE_VERSION_CODE -
1040 LUSTRE_VERSION_OFFSET_WARN)) {
1041 /* Sigh, some compilers do not like #ifdef in the middle
1042 of macro arguments */
1043 const char *older = "older. Consider upgrading server or downgrading client"
1044 ;
1045 const char *newer = "newer than client version. Consider upgrading client"
1046 ;
1047
1048 LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) is much %s (%s)\n",
1049 obd2cli_tgt(imp->imp_obd),
1050 OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1051 OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1052 OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1053 OBD_OCD_VERSION_FIX(ocd->ocd_version),
1054 ocd->ocd_version > LUSTRE_VERSION_CODE ?
1055 newer : older, LUSTRE_VERSION_STRING);
1056 }
1057
1058 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 50, 0)
1059 /* Check if server has LU-1252 fix applied to not always swab
1060 * the IR MNE entries. Do this only once per connection. This
1061 * fixup is version-limited, because we don't want to carry the
1062 * OBD_CONNECT_MNE_SWAB flag around forever, just so long as we
1063 * need interop with unpatched 2.2 servers. For newer servers,
1064 * the client will do MNE swabbing only as needed. LU-1644 */
1065 if (unlikely((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1066 !(ocd->ocd_connect_flags & OBD_CONNECT_MNE_SWAB) &&
1067 OBD_OCD_VERSION_MAJOR(ocd->ocd_version) == 2 &&
1068 OBD_OCD_VERSION_MINOR(ocd->ocd_version) == 2 &&
1069 OBD_OCD_VERSION_PATCH(ocd->ocd_version) < 55 &&
1070 strcmp(imp->imp_obd->obd_type->typ_name,
1071 LUSTRE_MGC_NAME) == 0))
1072 imp->imp_need_mne_swab = 1;
1073 else /* clear if server was upgraded since last connect */
1074 imp->imp_need_mne_swab = 0;
1075 #else
1076 #warning "LU-1644: Remove old OBD_CONNECT_MNE_SWAB fixup and imp_need_mne_swab"
1077 #endif
1078
1079 if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
1080 /* We sent to the server ocd_cksum_types with bits set
1081 * for algorithms we understand. The server masked off
1082 * the checksum types it doesn't support */
1083 if ((ocd->ocd_cksum_types &
1084 cksum_types_supported_client()) == 0) {
1085 LCONSOLE_WARN("The negotiation of the checksum algorithm to use with server %s failed (%x/%x), disabling checksums\n",
1086 obd2cli_tgt(imp->imp_obd),
1087 ocd->ocd_cksum_types,
1088 cksum_types_supported_client());
1089 cli->cl_checksum = 0;
1090 cli->cl_supp_cksum_types = OBD_CKSUM_ADLER;
1091 } else {
1092 cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
1093 }
1094 } else {
1095 /* The server does not support OBD_CONNECT_CKSUM.
1096 * Enforce ADLER for backward compatibility*/
1097 cli->cl_supp_cksum_types = OBD_CKSUM_ADLER;
1098 }
1099 cli->cl_cksum_type = cksum_type_select(cli->cl_supp_cksum_types);
1100
1101 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE)
1102 cli->cl_max_pages_per_rpc =
1103 min(ocd->ocd_brw_size >> PAGE_CACHE_SHIFT,
1104 cli->cl_max_pages_per_rpc);
1105 else if (imp->imp_connect_op == MDS_CONNECT ||
1106 imp->imp_connect_op == MGS_CONNECT)
1107 cli->cl_max_pages_per_rpc = 1;
1108
1109 /* Reset ns_connect_flags only for initial connect. It might be
1110 * changed in while using FS and if we reset it in reconnect
1111 * this leads to losing user settings done before such as
1112 * disable lru_resize, etc. */
1113 if (old_connect_flags != exp_connect_flags(exp) ||
1114 aa->pcaa_initial_connect) {
1115 CDEBUG(D_HA, "%s: Resetting ns_connect_flags to server flags: %#llx\n",
1116 imp->imp_obd->obd_name, ocd->ocd_connect_flags);
1117 imp->imp_obd->obd_namespace->ns_connect_flags =
1118 ocd->ocd_connect_flags;
1119 imp->imp_obd->obd_namespace->ns_orig_connect_flags =
1120 ocd->ocd_connect_flags;
1121 }
1122
1123 if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
1124 (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1125 /* We need a per-message support flag, because
1126 a. we don't know if the incoming connect reply
1127 supports AT or not (in reply_in_callback)
1128 until we unpack it.
1129 b. failovered server means export and flags are gone
1130 (in ptlrpc_send_reply).
1131 Can only be set when we know AT is supported at
1132 both ends */
1133 imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1134 else
1135 imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1136
1137 if ((ocd->ocd_connect_flags & OBD_CONNECT_FULL20) &&
1138 (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1139 imp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1140 else
1141 imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1142
1143 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
1144 (cli->cl_max_pages_per_rpc > 0));
1145 }
1146
1147 out:
1148 imp->imp_connect_tried = 1;
1149
1150 if (rc != 0) {
1151 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
1152 if (rc == -EACCES) {
1153 /*
1154 * Give up trying to reconnect
1155 * EACCES means client has no permission for connection
1156 */
1157 imp->imp_obd->obd_no_recov = 1;
1158 ptlrpc_deactivate_import(imp);
1159 }
1160
1161 if (rc == -EPROTO) {
1162 struct obd_connect_data *ocd;
1163
1164 /* reply message might not be ready */
1165 if (request->rq_repmsg == NULL)
1166 return -EPROTO;
1167
1168 ocd = req_capsule_server_get(&request->rq_pill,
1169 &RMF_CONNECT_DATA);
1170 if (ocd &&
1171 (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1172 (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
1173 /*
1174 * Actually servers are only supposed to refuse
1175 * connection from liblustre clients, so we
1176 * should never see this from VFS context
1177 */
1178 LCONSOLE_ERROR_MSG(0x16a, "Server %s version (%d.%d.%d.%d) refused connection from this client with an incompatible version (%s). Client must be recompiled\n",
1179 obd2cli_tgt(imp->imp_obd),
1180 OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1181 OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1182 OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1183 OBD_OCD_VERSION_FIX(ocd->ocd_version),
1184 LUSTRE_VERSION_STRING);
1185 ptlrpc_deactivate_import(imp);
1186 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
1187 }
1188 return -EPROTO;
1189 }
1190
1191 ptlrpc_maybe_ping_import_soon(imp);
1192
1193 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
1194 obd2cli_tgt(imp->imp_obd),
1195 (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
1196 }
1197
1198 wake_up_all(&imp->imp_recovery_waitq);
1199 return rc;
1200 }
1201
1202 /**
1203 * interpret callback for "completed replay" RPCs.
1204 * \see signal_completed_replay
1205 */
1206 static int completed_replay_interpret(const struct lu_env *env,
1207 struct ptlrpc_request *req,
1208 void *data, int rc)
1209 {
1210 atomic_dec(&req->rq_import->imp_replay_inflight);
1211 if (req->rq_status == 0 &&
1212 !req->rq_import->imp_vbr_failed) {
1213 ptlrpc_import_recovery_state_machine(req->rq_import);
1214 } else {
1215 if (req->rq_import->imp_vbr_failed) {
1216 CDEBUG(D_WARNING,
1217 "%s: version recovery fails, reconnecting\n",
1218 req->rq_import->imp_obd->obd_name);
1219 } else {
1220 CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, reconnecting\n",
1221 req->rq_import->imp_obd->obd_name,
1222 req->rq_status);
1223 }
1224 ptlrpc_connect_import(req->rq_import);
1225 }
1226
1227 return 0;
1228 }
1229
1230 /**
1231 * Let server know that we have no requests to replay anymore.
1232 * Achieved by just sending a PING request
1233 */
1234 static int signal_completed_replay(struct obd_import *imp)
1235 {
1236 struct ptlrpc_request *req;
1237
1238 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_FINISH_REPLAY)))
1239 return 0;
1240
1241 LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1242 atomic_inc(&imp->imp_replay_inflight);
1243
1244 req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
1245 OBD_PING);
1246 if (req == NULL) {
1247 atomic_dec(&imp->imp_replay_inflight);
1248 return -ENOMEM;
1249 }
1250
1251 ptlrpc_request_set_replen(req);
1252 req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
1253 lustre_msg_add_flags(req->rq_reqmsg,
1254 MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
1255 if (AT_OFF)
1256 req->rq_timeout *= 3;
1257 req->rq_interpret_reply = completed_replay_interpret;
1258
1259 ptlrpcd_add_req(req);
1260 return 0;
1261 }
1262
1263 /**
1264 * In kernel code all import invalidation happens in its own
1265 * separate thread, so that whatever application happened to encounter
1266 * a problem could still be killed or otherwise continue
1267 */
1268 static int ptlrpc_invalidate_import_thread(void *data)
1269 {
1270 struct obd_import *imp = data;
1271
1272 unshare_fs_struct();
1273
1274 CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
1275 imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1276 imp->imp_connection->c_remote_uuid.uuid);
1277
1278 ptlrpc_invalidate_import(imp);
1279
1280 if (obd_dump_on_eviction) {
1281 CERROR("dump the log upon eviction\n");
1282 libcfs_debug_dumplog();
1283 }
1284
1285 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1286 ptlrpc_import_recovery_state_machine(imp);
1287
1288 class_import_put(imp);
1289 return 0;
1290 }
1291
1292 /**
1293 * This is the state machine for client-side recovery on import.
1294 *
1295 * Typically we have two possibly paths. If we came to server and it is not
1296 * in recovery, we just enter IMP_EVICTED state, invalidate our import
1297 * state and reconnect from scratch.
1298 * If we came to server that is in recovery, we enter IMP_REPLAY import state.
1299 * We go through our list of requests to replay and send them to server one by
1300 * one.
1301 * After sending all request from the list we change import state to
1302 * IMP_REPLAY_LOCKS and re-request all the locks we believe we have from server
1303 * and also all the locks we don't yet have and wait for server to grant us.
1304 * After that we send a special "replay completed" request and change import
1305 * state to IMP_REPLAY_WAIT.
1306 * Upon receiving reply to that "replay completed" RPC we enter IMP_RECOVER
1307 * state and resend all requests from sending list.
1308 * After that we promote import to FULL state and send all delayed requests
1309 * and import is fully operational after that.
1310 *
1311 */
1312 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
1313 {
1314 int rc = 0;
1315 int inflight;
1316 char *target_start;
1317 int target_len;
1318
1319 if (imp->imp_state == LUSTRE_IMP_EVICTED) {
1320 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1321 &target_start, &target_len);
1322 /* Don't care about MGC eviction */
1323 if (strcmp(imp->imp_obd->obd_type->typ_name,
1324 LUSTRE_MGC_NAME) != 0) {
1325 LCONSOLE_ERROR_MSG(0x167, "%s: This client was evicted by %.*s; in progress operations using this service will fail.\n",
1326 imp->imp_obd->obd_name, target_len,
1327 target_start);
1328 }
1329 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
1330 obd2cli_tgt(imp->imp_obd),
1331 imp->imp_connection->c_remote_uuid.uuid);
1332 /* reset vbr_failed flag upon eviction */
1333 spin_lock(&imp->imp_lock);
1334 imp->imp_vbr_failed = 0;
1335 spin_unlock(&imp->imp_lock);
1336
1337 {
1338 struct task_struct *task;
1339 /* bug 17802: XXX client_disconnect_export vs connect request
1340 * race. if client will evicted at this time, we start
1341 * invalidate thread without reference to import and import can
1342 * be freed at same time. */
1343 class_import_get(imp);
1344 task = kthread_run(ptlrpc_invalidate_import_thread, imp,
1345 "ll_imp_inval");
1346 if (IS_ERR(task)) {
1347 class_import_put(imp);
1348 CERROR("error starting invalidate thread: %d\n", rc);
1349 rc = PTR_ERR(task);
1350 } else {
1351 rc = 0;
1352 }
1353 return rc;
1354 }
1355 }
1356
1357 if (imp->imp_state == LUSTRE_IMP_REPLAY) {
1358 CDEBUG(D_HA, "replay requested by %s\n",
1359 obd2cli_tgt(imp->imp_obd));
1360 rc = ptlrpc_replay_next(imp, &inflight);
1361 if (inflight == 0 &&
1362 atomic_read(&imp->imp_replay_inflight) == 0) {
1363 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
1364 rc = ldlm_replay_locks(imp);
1365 if (rc)
1366 goto out;
1367 }
1368 rc = 0;
1369 }
1370
1371 if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
1372 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1373 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
1374 rc = signal_completed_replay(imp);
1375 if (rc)
1376 goto out;
1377 }
1378
1379 }
1380
1381 if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
1382 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1383 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1384 }
1385 }
1386
1387 if (imp->imp_state == LUSTRE_IMP_RECOVER) {
1388 CDEBUG(D_HA, "reconnected to %s@%s\n",
1389 obd2cli_tgt(imp->imp_obd),
1390 imp->imp_connection->c_remote_uuid.uuid);
1391
1392 rc = ptlrpc_resend(imp);
1393 if (rc)
1394 goto out;
1395 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
1396 ptlrpc_activate_import(imp);
1397
1398 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1399 &target_start, &target_len);
1400 LCONSOLE_INFO("%s: Connection restored to %.*s (at %s)\n",
1401 imp->imp_obd->obd_name,
1402 target_len, target_start,
1403 libcfs_nid2str(imp->imp_connection->c_peer.nid));
1404 }
1405
1406 if (imp->imp_state == LUSTRE_IMP_FULL) {
1407 wake_up_all(&imp->imp_recovery_waitq);
1408 ptlrpc_wake_delayed(imp);
1409 }
1410
1411 out:
1412 return rc;
1413 }
1414
1415 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1416 {
1417 struct ptlrpc_request *req;
1418 int rq_opc, rc = 0;
1419
1420 if (imp->imp_obd->obd_force)
1421 goto set_state;
1422
1423 switch (imp->imp_connect_op) {
1424 case OST_CONNECT:
1425 rq_opc = OST_DISCONNECT;
1426 break;
1427 case MDS_CONNECT:
1428 rq_opc = MDS_DISCONNECT;
1429 break;
1430 case MGS_CONNECT:
1431 rq_opc = MGS_DISCONNECT;
1432 break;
1433 default:
1434 rc = -EINVAL;
1435 CERROR("%s: don't know how to disconnect from %s (connect_op %d): rc = %d\n",
1436 imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1437 imp->imp_connect_op, rc);
1438 return rc;
1439 }
1440
1441 if (ptlrpc_import_in_recovery(imp)) {
1442 struct l_wait_info lwi;
1443 long timeout;
1444
1445 if (AT_OFF) {
1446 if (imp->imp_server_timeout)
1447 timeout = cfs_time_seconds(obd_timeout / 2);
1448 else
1449 timeout = cfs_time_seconds(obd_timeout);
1450 } else {
1451 int idx = import_at_get_index(imp,
1452 imp->imp_client->cli_request_portal);
1453 timeout = cfs_time_seconds(
1454 at_get(&imp->imp_at.iat_service_estimate[idx]));
1455 }
1456
1457 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1458 back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1459 rc = l_wait_event(imp->imp_recovery_waitq,
1460 !ptlrpc_import_in_recovery(imp), &lwi);
1461
1462 }
1463
1464 spin_lock(&imp->imp_lock);
1465 if (imp->imp_state != LUSTRE_IMP_FULL)
1466 goto out;
1467 spin_unlock(&imp->imp_lock);
1468
1469 req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
1470 LUSTRE_OBD_VERSION, rq_opc);
1471 if (req) {
1472 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1473 * it fails. We can get through the above with a down server
1474 * if the client doesn't know the server is gone yet. */
1475 req->rq_no_resend = 1;
1476
1477 /* We want client umounts to happen quickly, no matter the
1478 server state... */
1479 req->rq_timeout = min_t(int, req->rq_timeout,
1480 INITIAL_CONNECT_TIMEOUT);
1481
1482 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1483 req->rq_send_state = LUSTRE_IMP_CONNECTING;
1484 ptlrpc_request_set_replen(req);
1485 rc = ptlrpc_queue_wait(req);
1486 ptlrpc_req_finished(req);
1487 }
1488
1489 set_state:
1490 spin_lock(&imp->imp_lock);
1491 out:
1492 if (noclose)
1493 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1494 else
1495 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1496 memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1497 spin_unlock(&imp->imp_lock);
1498
1499 if (rc == -ETIMEDOUT || rc == -ENOTCONN || rc == -ESHUTDOWN)
1500 rc = 0;
1501
1502 return rc;
1503 }
1504 EXPORT_SYMBOL(ptlrpc_disconnect_import);
1505
1506 /* Adaptive Timeout utils */
1507 extern unsigned int at_min, at_max, at_history;
1508
1509 /* Bin into timeslices using AT_BINS bins.
1510 This gives us a max of the last binlimit*AT_BINS secs without the storage,
1511 but still smoothing out a return to normalcy from a slow response.
1512 (E.g. remember the maximum latency in each minute of the last 4 minutes.) */
1513 int at_measured(struct adaptive_timeout *at, unsigned int val)
1514 {
1515 unsigned int old = at->at_current;
1516 time64_t now = ktime_get_real_seconds();
1517 long binlimit = max_t(long, at_history / AT_BINS, 1);
1518
1519 LASSERT(at);
1520 CDEBUG(D_OTHER, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
1521 val, at, (long)(now - at->at_binstart), at->at_current,
1522 at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
1523
1524 if (val == 0)
1525 /* 0's don't count, because we never want our timeout to
1526 drop to 0, and because 0 could mean an error */
1527 return 0;
1528
1529 spin_lock(&at->at_lock);
1530
1531 if (unlikely(at->at_binstart == 0)) {
1532 /* Special case to remove default from history */
1533 at->at_current = val;
1534 at->at_worst_ever = val;
1535 at->at_worst_time = now;
1536 at->at_hist[0] = val;
1537 at->at_binstart = now;
1538 } else if (now - at->at_binstart < binlimit) {
1539 /* in bin 0 */
1540 at->at_hist[0] = max(val, at->at_hist[0]);
1541 at->at_current = max(val, at->at_current);
1542 } else {
1543 int i, shift;
1544 unsigned int maxv = val;
1545 /* move bins over */
1546 shift = (u32)(now - at->at_binstart) / binlimit;
1547 LASSERT(shift > 0);
1548 for (i = AT_BINS - 1; i >= 0; i--) {
1549 if (i >= shift) {
1550 at->at_hist[i] = at->at_hist[i - shift];
1551 maxv = max(maxv, at->at_hist[i]);
1552 } else {
1553 at->at_hist[i] = 0;
1554 }
1555 }
1556 at->at_hist[0] = val;
1557 at->at_current = maxv;
1558 at->at_binstart += shift * binlimit;
1559 }
1560
1561 if (at->at_current > at->at_worst_ever) {
1562 at->at_worst_ever = at->at_current;
1563 at->at_worst_time = now;
1564 }
1565
1566 if (at->at_flags & AT_FLG_NOHIST)
1567 /* Only keep last reported val; keeping the rest of the history
1568 for proc only */
1569 at->at_current = val;
1570
1571 if (at_max > 0)
1572 at->at_current = min(at->at_current, at_max);
1573 at->at_current = max(at->at_current, at_min);
1574
1575 if (at->at_current != old)
1576 CDEBUG(D_OTHER, "AT %p change: old=%u new=%u delta=%d (val=%u) hist %u %u %u %u\n",
1577 at,
1578 old, at->at_current, at->at_current - old, val,
1579 at->at_hist[0], at->at_hist[1], at->at_hist[2],
1580 at->at_hist[3]);
1581
1582 /* if we changed, report the old value */
1583 old = (at->at_current != old) ? old : 0;
1584
1585 spin_unlock(&at->at_lock);
1586 return old;
1587 }
1588
1589 /* Find the imp_at index for a given portal; assign if space available */
1590 int import_at_get_index(struct obd_import *imp, int portal)
1591 {
1592 struct imp_at *at = &imp->imp_at;
1593 int i;
1594
1595 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1596 if (at->iat_portal[i] == portal)
1597 return i;
1598 if (at->iat_portal[i] == 0)
1599 /* unused */
1600 break;
1601 }
1602
1603 /* Not found in list, add it under a lock */
1604 spin_lock(&imp->imp_lock);
1605
1606 /* Check unused under lock */
1607 for (; i < IMP_AT_MAX_PORTALS; i++) {
1608 if (at->iat_portal[i] == portal)
1609 goto out;
1610 if (at->iat_portal[i] == 0)
1611 /* unused */
1612 break;
1613 }
1614
1615 /* Not enough portals? */
1616 LASSERT(i < IMP_AT_MAX_PORTALS);
1617
1618 at->iat_portal[i] = portal;
1619 out:
1620 spin_unlock(&imp->imp_lock);
1621 return i;
1622 }
Linux kernel - Deliverables
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