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staging/lustre/ptlrpc: make ptlrpcd threads cpt-aware
[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, 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/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 get_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
107 static int ptlrpc_connect_interpret(const struct lu_env *env,
108 struct ptlrpc_request *request,
109 void *data, int rc);
110 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
111
112 /* Only this function is allowed to change the import state when it is
113 * CLOSED. I would rather refcount the import and free it after
114 * disconnection like we do with exports. To do that, the client_obd
115 * will need to save the peer info somewhere other than in the import,
116 * though. */
117 int ptlrpc_init_import(struct obd_import *imp)
118 {
119 spin_lock(&imp->imp_lock);
120
121 imp->imp_generation++;
122 imp->imp_state = LUSTRE_IMP_NEW;
123
124 spin_unlock(&imp->imp_lock);
125
126 return 0;
127 }
128 EXPORT_SYMBOL(ptlrpc_init_import);
129
130 #define UUID_STR "_UUID"
131 void deuuidify(char *uuid, const char *prefix, char **uuid_start, 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 EXPORT_SYMBOL(deuuidify);
146
147 /**
148 * Returns true if import was FULL, false if import was already not
149 * connected.
150 * @imp - import to be disconnected
151 * @conn_cnt - connection count (epoch) of the request that timed out
152 * and caused the disconnection. In some cases, multiple
153 * inflight requests can fail to a single target (e.g. OST
154 * bulk requests) and if one has already caused a reconnection
155 * (increasing the import->conn_cnt) the older failure should
156 * not also cause a reconnection. If zero it forces a reconnect.
157 */
158 int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
159 {
160 int rc = 0;
161
162 spin_lock(&imp->imp_lock);
163
164 if (imp->imp_state == LUSTRE_IMP_FULL &&
165 (conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
166 char *target_start;
167 int target_len;
168
169 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
170 &target_start, &target_len);
171
172 if (imp->imp_replayable) {
173 LCONSOLE_WARN("%s: Connection to %.*s (at %s) was lost; in progress operations using this service will wait for recovery to complete\n",
174 imp->imp_obd->obd_name, target_len, target_start,
175 libcfs_nid2str(imp->imp_connection->c_peer.nid));
176 } else {
177 LCONSOLE_ERROR_MSG(0x166, "%s: Connection to %.*s (at %s) was lost; in progress operations using this service will fail\n",
178 imp->imp_obd->obd_name,
179 target_len, target_start,
180 libcfs_nid2str(imp->imp_connection->c_peer.nid));
181 }
182 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
183 spin_unlock(&imp->imp_lock);
184
185 if (obd_dump_on_timeout)
186 libcfs_debug_dumplog();
187
188 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
189 rc = 1;
190 } else {
191 spin_unlock(&imp->imp_lock);
192 CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
193 imp->imp_client->cli_name, imp,
194 (imp->imp_state == LUSTRE_IMP_FULL &&
195 imp->imp_conn_cnt > conn_cnt) ?
196 "reconnected" : "not connected", imp->imp_conn_cnt,
197 conn_cnt, ptlrpc_import_state_name(imp->imp_state));
198 }
199
200 return rc;
201 }
202
203 /*
204 * This acts as a barrier; all existing requests are rejected, and
205 * no new requests will be accepted until the import is valid again.
206 */
207 void ptlrpc_deactivate_import(struct obd_import *imp)
208 {
209 CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
210
211 spin_lock(&imp->imp_lock);
212 imp->imp_invalid = 1;
213 imp->imp_generation++;
214 spin_unlock(&imp->imp_lock);
215
216 ptlrpc_abort_inflight(imp);
217 obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
218 }
219 EXPORT_SYMBOL(ptlrpc_deactivate_import);
220
221 static unsigned int
222 ptlrpc_inflight_deadline(struct ptlrpc_request *req, time_t now)
223 {
224 long dl;
225
226 if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
227 (req->rq_phase == RQ_PHASE_BULK) ||
228 (req->rq_phase == RQ_PHASE_NEW)))
229 return 0;
230
231 if (req->rq_timedout)
232 return 0;
233
234 if (req->rq_phase == RQ_PHASE_NEW)
235 dl = req->rq_sent;
236 else
237 dl = req->rq_deadline;
238
239 if (dl <= now)
240 return 0;
241
242 return dl - now;
243 }
244
245 static unsigned int ptlrpc_inflight_timeout(struct obd_import *imp)
246 {
247 time_t now = get_seconds();
248 struct list_head *tmp, *n;
249 struct ptlrpc_request *req;
250 unsigned int timeout = 0;
251
252 spin_lock(&imp->imp_lock);
253 list_for_each_safe(tmp, n, &imp->imp_sending_list) {
254 req = list_entry(tmp, struct ptlrpc_request, rq_list);
255 timeout = max(ptlrpc_inflight_deadline(req, now), timeout);
256 }
257 spin_unlock(&imp->imp_lock);
258 return timeout;
259 }
260
261 /**
262 * This function will invalidate the import, if necessary, then block
263 * for all the RPC completions, and finally notify the obd to
264 * invalidate its state (ie cancel locks, clear pending requests,
265 * etc).
266 */
267 void ptlrpc_invalidate_import(struct obd_import *imp)
268 {
269 struct list_head *tmp, *n;
270 struct ptlrpc_request *req;
271 struct l_wait_info lwi;
272 unsigned int timeout;
273 int rc;
274
275 atomic_inc(&imp->imp_inval_count);
276
277 if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
278 ptlrpc_deactivate_import(imp);
279
280 CFS_FAIL_TIMEOUT(OBD_FAIL_MGS_CONNECT_NET, 3 * cfs_fail_val / 2);
281 LASSERT(imp->imp_invalid);
282
283 /* Wait forever until inflight == 0. We really can't do it another
284 * way because in some cases we need to wait for very long reply
285 * unlink. We can't do anything before that because there is really
286 * no guarantee that some rdma transfer is not in progress right now. */
287 do {
288 /* Calculate max timeout for waiting on rpcs to error
289 * out. Use obd_timeout if calculated value is smaller
290 * than it. */
291 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
292 timeout = ptlrpc_inflight_timeout(imp);
293 timeout += timeout / 3;
294
295 if (timeout == 0)
296 timeout = obd_timeout;
297 } else {
298 /* decrease the interval to increase race condition */
299 timeout = 1;
300 }
301
302 CDEBUG(D_RPCTRACE,
303 "Sleeping %d sec for inflight to error out\n",
304 timeout);
305
306 /* Wait for all requests to error out and call completion
307 * callbacks. Cap it at obd_timeout -- these should all
308 * have been locally cancelled by ptlrpc_abort_inflight. */
309 lwi = LWI_TIMEOUT_INTERVAL(
310 cfs_timeout_cap(cfs_time_seconds(timeout)),
311 (timeout > 1)?cfs_time_seconds(1):cfs_time_seconds(1)/2,
312 NULL, NULL);
313 rc = l_wait_event(imp->imp_recovery_waitq,
314 (atomic_read(&imp->imp_inflight) == 0),
315 &lwi);
316 if (rc) {
317 const char *cli_tgt = obd2cli_tgt(imp->imp_obd);
318
319 CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
320 cli_tgt, rc,
321 atomic_read(&imp->imp_inflight));
322
323 spin_lock(&imp->imp_lock);
324 if (atomic_read(&imp->imp_inflight) == 0) {
325 int count = atomic_read(&imp->imp_unregistering);
326
327 /* We know that "unregistering" rpcs only can
328 * survive in sending or delaying lists (they
329 * maybe waiting for long reply unlink in
330 * sluggish nets). Let's check this. If there
331 * is no inflight and unregistering != 0, this
332 * is bug. */
333 LASSERTF(count == 0, "Some RPCs are still unregistering: %d\n",
334 count);
335
336 /* Let's save one loop as soon as inflight have
337 * dropped to zero. No new inflights possible at
338 * this point. */
339 rc = 0;
340 } else {
341 list_for_each_safe(tmp, n,
342 &imp->imp_sending_list) {
343 req = list_entry(tmp,
344 struct ptlrpc_request,
345 rq_list);
346 DEBUG_REQ(D_ERROR, req,
347 "still on sending list");
348 }
349 list_for_each_safe(tmp, n,
350 &imp->imp_delayed_list) {
351 req = list_entry(tmp,
352 struct ptlrpc_request,
353 rq_list);
354 DEBUG_REQ(D_ERROR, req,
355 "still on delayed list");
356 }
357
358 CERROR("%s: RPCs in \"%s\" phase found (%d). Network is sluggish? Waiting them to error out.\n",
359 cli_tgt,
360 ptlrpc_phase2str(RQ_PHASE_UNREGISTERING),
361 atomic_read(&imp->
362 imp_unregistering));
363 }
364 spin_unlock(&imp->imp_lock);
365 }
366 } while (rc != 0);
367
368 /*
369 * Let's additionally check that no new rpcs added to import in
370 * "invalidate" state.
371 */
372 LASSERT(atomic_read(&imp->imp_inflight) == 0);
373 obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
374 sptlrpc_import_flush_all_ctx(imp);
375
376 atomic_dec(&imp->imp_inval_count);
377 wake_up_all(&imp->imp_recovery_waitq);
378 }
379 EXPORT_SYMBOL(ptlrpc_invalidate_import);
380
381 /* unset imp_invalid */
382 void ptlrpc_activate_import(struct obd_import *imp)
383 {
384 struct obd_device *obd = imp->imp_obd;
385
386 spin_lock(&imp->imp_lock);
387 if (imp->imp_deactive != 0) {
388 spin_unlock(&imp->imp_lock);
389 return;
390 }
391
392 imp->imp_invalid = 0;
393 spin_unlock(&imp->imp_lock);
394 obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
395 }
396 EXPORT_SYMBOL(ptlrpc_activate_import);
397
398 static void ptlrpc_pinger_force(struct obd_import *imp)
399 {
400 CDEBUG(D_HA, "%s: waking up pinger s:%s\n", obd2cli_tgt(imp->imp_obd),
401 ptlrpc_import_state_name(imp->imp_state));
402
403 spin_lock(&imp->imp_lock);
404 imp->imp_force_verify = 1;
405 spin_unlock(&imp->imp_lock);
406
407 if (imp->imp_state != LUSTRE_IMP_CONNECTING)
408 ptlrpc_pinger_wake_up();
409 }
410
411 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
412 {
413 LASSERT(!imp->imp_dlm_fake);
414
415 if (ptlrpc_set_import_discon(imp, conn_cnt)) {
416 if (!imp->imp_replayable) {
417 CDEBUG(D_HA, "import %s@%s for %s not replayable, auto-deactivating\n",
418 obd2cli_tgt(imp->imp_obd),
419 imp->imp_connection->c_remote_uuid.uuid,
420 imp->imp_obd->obd_name);
421 ptlrpc_deactivate_import(imp);
422 }
423
424 ptlrpc_pinger_force(imp);
425 }
426 }
427 EXPORT_SYMBOL(ptlrpc_fail_import);
428
429 int ptlrpc_reconnect_import(struct obd_import *imp)
430 {
431 #ifdef ENABLE_PINGER
432 struct l_wait_info lwi;
433 int secs = cfs_time_seconds(obd_timeout);
434 int rc;
435
436 ptlrpc_pinger_force(imp);
437
438 CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
439 obd2cli_tgt(imp->imp_obd), secs);
440
441 lwi = LWI_TIMEOUT(secs, NULL, NULL);
442 rc = l_wait_event(imp->imp_recovery_waitq,
443 !ptlrpc_import_in_recovery(imp), &lwi);
444 CDEBUG(D_HA, "%s: recovery finished s:%s\n", obd2cli_tgt(imp->imp_obd),
445 ptlrpc_import_state_name(imp->imp_state));
446 return rc;
447 #else
448 ptlrpc_set_import_discon(imp, 0);
449 /* Force a new connect attempt */
450 ptlrpc_invalidate_import(imp);
451 /* Do a fresh connect next time by zeroing the handle */
452 ptlrpc_disconnect_import(imp, 1);
453 /* Wait for all invalidate calls to finish */
454 if (atomic_read(&imp->imp_inval_count) > 0) {
455 int rc;
456 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
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 if (at_get(at) < CONNECTION_SWITCH_MAX) {
539 at_measured(at, at_get(at) + CONNECTION_SWITCH_INC);
540 if (at_get(at) > CONNECTION_SWITCH_MAX)
541 at_reset(at, CONNECTION_SWITCH_MAX);
542 }
543 LASSERT(imp_conn->oic_last_attempt);
544 CDEBUG(D_HA, "%s: tried all connections, increasing latency to %ds\n",
545 imp->imp_obd->obd_name, at_get(at));
546 }
547
548 imp_conn->oic_last_attempt = cfs_time_current_64();
549
550 /* switch connection, don't mind if it's same as the current one */
551 ptlrpc_connection_put(imp->imp_connection);
552 imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
553
554 dlmexp = class_conn2export(&imp->imp_dlm_handle);
555 LASSERT(dlmexp != NULL);
556 ptlrpc_connection_put(dlmexp->exp_connection);
557 dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
558 class_export_put(dlmexp);
559
560 if (imp->imp_conn_current != imp_conn) {
561 if (imp->imp_conn_current) {
562 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
563 &target_start, &target_len);
564
565 CDEBUG(D_HA, "%s: Connection changing to %.*s (at %s)\n",
566 imp->imp_obd->obd_name,
567 target_len, target_start,
568 libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
569 }
570
571 imp->imp_conn_current = imp_conn;
572 }
573
574 CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
575 imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
576 libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
577
578 spin_unlock(&imp->imp_lock);
579
580 return 0;
581 }
582
583 /*
584 * must be called under imp_lock
585 */
586 static int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
587 {
588 struct ptlrpc_request *req;
589 struct list_head *tmp;
590
591 /* The requests in committed_list always have smaller transnos than
592 * the requests in replay_list */
593 if (!list_empty(&imp->imp_committed_list)) {
594 tmp = imp->imp_committed_list.next;
595 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
596 *transno = req->rq_transno;
597 if (req->rq_transno == 0) {
598 DEBUG_REQ(D_ERROR, req,
599 "zero transno in committed_list");
600 LBUG();
601 }
602 return 1;
603 }
604 if (!list_empty(&imp->imp_replay_list)) {
605 tmp = imp->imp_replay_list.next;
606 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
607 *transno = req->rq_transno;
608 if (req->rq_transno == 0) {
609 DEBUG_REQ(D_ERROR, req, "zero transno in replay_list");
610 LBUG();
611 }
612 return 1;
613 }
614 return 0;
615 }
616
617 /**
618 * Attempt to (re)connect import \a imp. This includes all preparations,
619 * initializing CONNECT RPC request and passing it to ptlrpcd for
620 * actual sending.
621 * Returns 0 on success or error code.
622 */
623 int ptlrpc_connect_import(struct obd_import *imp)
624 {
625 struct obd_device *obd = imp->imp_obd;
626 int initial_connect = 0;
627 int set_transno = 0;
628 __u64 committed_before_reconnect = 0;
629 struct ptlrpc_request *request;
630 char *bufs[] = { NULL,
631 obd2cli_tgt(imp->imp_obd),
632 obd->obd_uuid.uuid,
633 (char *)&imp->imp_dlm_handle,
634 (char *)&imp->imp_connect_data };
635 struct ptlrpc_connect_async_args *aa;
636 int rc;
637
638 spin_lock(&imp->imp_lock);
639 if (imp->imp_state == LUSTRE_IMP_CLOSED) {
640 spin_unlock(&imp->imp_lock);
641 CERROR("can't connect to a closed import\n");
642 return -EINVAL;
643 } else if (imp->imp_state == LUSTRE_IMP_FULL) {
644 spin_unlock(&imp->imp_lock);
645 CERROR("already connected\n");
646 return 0;
647 } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
648 spin_unlock(&imp->imp_lock);
649 CERROR("already connecting\n");
650 return -EALREADY;
651 }
652
653 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
654
655 imp->imp_conn_cnt++;
656 imp->imp_resend_replay = 0;
657
658 if (!lustre_handle_is_used(&imp->imp_remote_handle))
659 initial_connect = 1;
660 else
661 committed_before_reconnect = imp->imp_peer_committed_transno;
662
663 set_transno = ptlrpc_first_transno(imp,
664 &imp->imp_connect_data.ocd_transno);
665 spin_unlock(&imp->imp_lock);
666
667 rc = import_select_connection(imp);
668 if (rc)
669 goto out;
670
671 rc = sptlrpc_import_sec_adapt(imp, NULL, NULL);
672 if (rc)
673 goto out;
674
675 /* Reset connect flags to the originally requested flags, in case
676 * the server is updated on-the-fly we will get the new features. */
677 imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
678 /* Reset ocd_version each time so the server knows the exact versions */
679 imp->imp_connect_data.ocd_version = LUSTRE_VERSION_CODE;
680 imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
681 imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
682
683 rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
684 &obd->obd_uuid, &imp->imp_connect_data, NULL);
685 if (rc)
686 goto out;
687
688 request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
689 if (request == NULL) {
690 rc = -ENOMEM;
691 goto out;
692 }
693
694 rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
695 imp->imp_connect_op, bufs, NULL);
696 if (rc) {
697 ptlrpc_request_free(request);
698 goto out;
699 }
700
701 /* Report the rpc service time to the server so that it knows how long
702 * to wait for clients to join recovery */
703 lustre_msg_set_service_time(request->rq_reqmsg,
704 at_timeout2est(request->rq_timeout));
705
706 /* The amount of time we give the server to process the connect req.
707 * import_select_connection will increase the net latency on
708 * repeated reconnect attempts to cover slow networks.
709 * We override/ignore the server rpc completion estimate here,
710 * which may be large if this is a reconnect attempt */
711 request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
712 lustre_msg_set_timeout(request->rq_reqmsg, request->rq_timeout);
713
714 lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
715
716 request->rq_no_resend = request->rq_no_delay = 1;
717 request->rq_send_state = LUSTRE_IMP_CONNECTING;
718 /* Allow a slightly larger reply for future growth compatibility */
719 req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
720 sizeof(struct obd_connect_data)+16*sizeof(__u64));
721 ptlrpc_request_set_replen(request);
722 request->rq_interpret_reply = ptlrpc_connect_interpret;
723
724 CLASSERT(sizeof(*aa) <= sizeof(request->rq_async_args));
725 aa = ptlrpc_req_async_args(request);
726 memset(aa, 0, sizeof(*aa));
727
728 aa->pcaa_peer_committed = committed_before_reconnect;
729 aa->pcaa_initial_connect = initial_connect;
730
731 if (aa->pcaa_initial_connect) {
732 spin_lock(&imp->imp_lock);
733 imp->imp_replayable = 1;
734 spin_unlock(&imp->imp_lock);
735 lustre_msg_add_op_flags(request->rq_reqmsg,
736 MSG_CONNECT_INITIAL);
737 }
738
739 if (set_transno)
740 lustre_msg_add_op_flags(request->rq_reqmsg,
741 MSG_CONNECT_TRANSNO);
742
743 DEBUG_REQ(D_RPCTRACE, request, "(re)connect request (timeout %d)",
744 request->rq_timeout);
745 ptlrpcd_add_req(request);
746 rc = 0;
747 out:
748 if (rc != 0)
749 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
750
751 return rc;
752 }
753 EXPORT_SYMBOL(ptlrpc_connect_import);
754
755 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
756 {
757 int force_verify;
758
759 spin_lock(&imp->imp_lock);
760 force_verify = imp->imp_force_verify != 0;
761 spin_unlock(&imp->imp_lock);
762
763 if (force_verify)
764 ptlrpc_pinger_wake_up();
765 }
766
767 static int ptlrpc_busy_reconnect(int rc)
768 {
769 return (rc == -EBUSY) || (rc == -EAGAIN);
770 }
771
772 /**
773 * interpret_reply callback for connect RPCs.
774 * Looks into returned status of connect operation and decides
775 * what to do with the import - i.e enter recovery, promote it to
776 * full state for normal operations of disconnect it due to an error.
777 */
778 static int ptlrpc_connect_interpret(const struct lu_env *env,
779 struct ptlrpc_request *request,
780 void *data, int rc)
781 {
782 struct ptlrpc_connect_async_args *aa = data;
783 struct obd_import *imp = request->rq_import;
784 struct client_obd *cli = &imp->imp_obd->u.cli;
785 struct lustre_handle old_hdl;
786 __u64 old_connect_flags;
787 int msg_flags;
788 struct obd_connect_data *ocd;
789 struct obd_export *exp;
790 int ret;
791
792 spin_lock(&imp->imp_lock);
793 if (imp->imp_state == LUSTRE_IMP_CLOSED) {
794 imp->imp_connect_tried = 1;
795 spin_unlock(&imp->imp_lock);
796 return 0;
797 }
798
799 if (rc) {
800 /* if this reconnect to busy export - not need select new target
801 * for connecting*/
802 imp->imp_force_reconnect = ptlrpc_busy_reconnect(rc);
803 spin_unlock(&imp->imp_lock);
804 ptlrpc_maybe_ping_import_soon(imp);
805 goto out;
806 }
807 spin_unlock(&imp->imp_lock);
808
809 LASSERT(imp->imp_conn_current);
810
811 msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
812
813 ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
814 RCL_SERVER);
815 /* server replied obd_connect_data is always bigger */
816 ocd = req_capsule_server_sized_get(&request->rq_pill,
817 &RMF_CONNECT_DATA, ret);
818
819 if (ocd == NULL) {
820 CERROR("%s: no connect data from server\n",
821 imp->imp_obd->obd_name);
822 rc = -EPROTO;
823 goto out;
824 }
825
826 spin_lock(&imp->imp_lock);
827
828 /* All imports are pingable */
829 imp->imp_pingable = 1;
830 imp->imp_force_reconnect = 0;
831 imp->imp_force_verify = 0;
832
833 imp->imp_connect_data = *ocd;
834
835 CDEBUG(D_HA, "%s: connect to target with instance %u\n",
836 imp->imp_obd->obd_name, ocd->ocd_instance);
837 exp = class_conn2export(&imp->imp_dlm_handle);
838
839 spin_unlock(&imp->imp_lock);
840
841 /* check that server granted subset of flags we asked for. */
842 if ((ocd->ocd_connect_flags & imp->imp_connect_flags_orig) !=
843 ocd->ocd_connect_flags) {
844 CERROR("%s: Server didn't granted asked subset of flags: asked=%#llx grranted=%#llx\n",
845 imp->imp_obd->obd_name, imp->imp_connect_flags_orig,
846 ocd->ocd_connect_flags);
847 rc = -EPROTO;
848 goto out;
849 }
850
851 if (!exp) {
852 /* This could happen if export is cleaned during the
853 connect attempt */
854 CERROR("%s: missing export after connect\n",
855 imp->imp_obd->obd_name);
856 rc = -ENODEV;
857 goto out;
858 }
859 old_connect_flags = exp_connect_flags(exp);
860 exp->exp_connect_data = *ocd;
861 imp->imp_obd->obd_self_export->exp_connect_data = *ocd;
862 class_export_put(exp);
863
864 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
865
866 if (aa->pcaa_initial_connect) {
867 spin_lock(&imp->imp_lock);
868 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
869 imp->imp_replayable = 1;
870 spin_unlock(&imp->imp_lock);
871 CDEBUG(D_HA, "connected to replayable target: %s\n",
872 obd2cli_tgt(imp->imp_obd));
873 } else {
874 imp->imp_replayable = 0;
875 spin_unlock(&imp->imp_lock);
876 }
877
878 /* if applies, adjust the imp->imp_msg_magic here
879 * according to reply flags */
880
881 imp->imp_remote_handle =
882 *lustre_msg_get_handle(request->rq_repmsg);
883
884 /* Initial connects are allowed for clients with non-random
885 * uuids when servers are in recovery. Simply signal the
886 * servers replay is complete and wait in REPLAY_WAIT. */
887 if (msg_flags & MSG_CONNECT_RECOVERING) {
888 CDEBUG(D_HA, "connect to %s during recovery\n",
889 obd2cli_tgt(imp->imp_obd));
890 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
891 } else {
892 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
893 ptlrpc_activate_import(imp);
894 }
895
896 rc = 0;
897 goto finish;
898 }
899
900 /* Determine what recovery state to move the import to. */
901 if (msg_flags & MSG_CONNECT_RECONNECT) {
902 memset(&old_hdl, 0, sizeof(old_hdl));
903 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
904 sizeof(old_hdl))) {
905 LCONSOLE_WARN("Reconnect to %s (at @%s) failed due bad handle %#llx\n",
906 obd2cli_tgt(imp->imp_obd),
907 imp->imp_connection->c_remote_uuid.uuid,
908 imp->imp_dlm_handle.cookie);
909 rc = -ENOTCONN;
910 goto out;
911 }
912
913 if (memcmp(&imp->imp_remote_handle,
914 lustre_msg_get_handle(request->rq_repmsg),
915 sizeof(imp->imp_remote_handle))) {
916 int level = msg_flags & MSG_CONNECT_RECOVERING ?
917 D_HA : D_WARNING;
918
919 /* Bug 16611/14775: if server handle have changed,
920 * that means some sort of disconnection happened.
921 * If the server is not in recovery, that also means it
922 * already erased all of our state because of previous
923 * eviction. If it is in recovery - we are safe to
924 * participate since we can reestablish all of our state
925 * with server again */
926 if ((msg_flags & MSG_CONNECT_RECOVERING)) {
927 CDEBUG(level, "%s@%s changed server handle from %#llx to %#llx but is still in recovery\n",
928 obd2cli_tgt(imp->imp_obd),
929 imp->imp_connection->c_remote_uuid.uuid,
930 imp->imp_remote_handle.cookie,
931 lustre_msg_get_handle(
932 request->rq_repmsg)->cookie);
933 } else {
934 LCONSOLE_WARN("Evicted from %s (at %s) after server handle changed from %#llx to %#llx\n",
935 obd2cli_tgt(imp->imp_obd),
936 imp->imp_connection-> \
937 c_remote_uuid.uuid,
938 imp->imp_remote_handle.cookie,
939 lustre_msg_get_handle(
940 request->rq_repmsg)->cookie);
941 }
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 void ptlrpc_cleanup_imp(struct obd_import *imp)
1507 {
1508 spin_lock(&imp->imp_lock);
1509 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1510 imp->imp_generation++;
1511 spin_unlock(&imp->imp_lock);
1512 ptlrpc_abort_inflight(imp);
1513 }
1514 EXPORT_SYMBOL(ptlrpc_cleanup_imp);
1515
1516 /* Adaptive Timeout utils */
1517 extern unsigned int at_min, at_max, at_history;
1518
1519 /* Bin into timeslices using AT_BINS bins.
1520 This gives us a max of the last binlimit*AT_BINS secs without the storage,
1521 but still smoothing out a return to normalcy from a slow response.
1522 (E.g. remember the maximum latency in each minute of the last 4 minutes.) */
1523 int at_measured(struct adaptive_timeout *at, unsigned int val)
1524 {
1525 unsigned int old = at->at_current;
1526 time_t now = get_seconds();
1527 time_t binlimit = max_t(time_t, at_history / AT_BINS, 1);
1528
1529 LASSERT(at);
1530 CDEBUG(D_OTHER, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
1531 val, at, now - at->at_binstart, at->at_current,
1532 at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
1533
1534 if (val == 0)
1535 /* 0's don't count, because we never want our timeout to
1536 drop to 0, and because 0 could mean an error */
1537 return 0;
1538
1539 spin_lock(&at->at_lock);
1540
1541 if (unlikely(at->at_binstart == 0)) {
1542 /* Special case to remove default from history */
1543 at->at_current = val;
1544 at->at_worst_ever = val;
1545 at->at_worst_time = now;
1546 at->at_hist[0] = val;
1547 at->at_binstart = now;
1548 } else if (now - at->at_binstart < binlimit) {
1549 /* in bin 0 */
1550 at->at_hist[0] = max(val, at->at_hist[0]);
1551 at->at_current = max(val, at->at_current);
1552 } else {
1553 int i, shift;
1554 unsigned int maxv = val;
1555 /* move bins over */
1556 shift = (now - at->at_binstart) / binlimit;
1557 LASSERT(shift > 0);
1558 for (i = AT_BINS - 1; i >= 0; i--) {
1559 if (i >= shift) {
1560 at->at_hist[i] = at->at_hist[i - shift];
1561 maxv = max(maxv, at->at_hist[i]);
1562 } else {
1563 at->at_hist[i] = 0;
1564 }
1565 }
1566 at->at_hist[0] = val;
1567 at->at_current = maxv;
1568 at->at_binstart += shift * binlimit;
1569 }
1570
1571 if (at->at_current > at->at_worst_ever) {
1572 at->at_worst_ever = at->at_current;
1573 at->at_worst_time = now;
1574 }
1575
1576 if (at->at_flags & AT_FLG_NOHIST)
1577 /* Only keep last reported val; keeping the rest of the history
1578 for proc only */
1579 at->at_current = val;
1580
1581 if (at_max > 0)
1582 at->at_current = min(at->at_current, at_max);
1583 at->at_current = max(at->at_current, at_min);
1584
1585 if (at->at_current != old)
1586 CDEBUG(D_OTHER, "AT %p change: old=%u new=%u delta=%d (val=%u) hist %u %u %u %u\n",
1587 at,
1588 old, at->at_current, at->at_current - old, val,
1589 at->at_hist[0], at->at_hist[1], at->at_hist[2],
1590 at->at_hist[3]);
1591
1592 /* if we changed, report the old value */
1593 old = (at->at_current != old) ? old : 0;
1594
1595 spin_unlock(&at->at_lock);
1596 return old;
1597 }
1598
1599 /* Find the imp_at index for a given portal; assign if space available */
1600 int import_at_get_index(struct obd_import *imp, int portal)
1601 {
1602 struct imp_at *at = &imp->imp_at;
1603 int i;
1604
1605 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1606 if (at->iat_portal[i] == portal)
1607 return i;
1608 if (at->iat_portal[i] == 0)
1609 /* unused */
1610 break;
1611 }
1612
1613 /* Not found in list, add it under a lock */
1614 spin_lock(&imp->imp_lock);
1615
1616 /* Check unused under lock */
1617 for (; i < IMP_AT_MAX_PORTALS; i++) {
1618 if (at->iat_portal[i] == portal)
1619 goto out;
1620 if (at->iat_portal[i] == 0)
1621 /* unused */
1622 break;
1623 }
1624
1625 /* Not enough portals? */
1626 LASSERT(i < IMP_AT_MAX_PORTALS);
1627
1628 at->iat_portal[i] = portal;
1629 out:
1630 spin_unlock(&imp->imp_lock);
1631 return i;
1632 }
Linux kernel - Deliverables
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