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staging/lustre/llite: remove dead code
[deliverable/linux.git] / drivers / staging / lustre / lustre / ptlrpc / import.c
CommitLineData
d7e09d03
PT		 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 <obd_support.h>
44#include <lustre_ha.h>
45#include <lustre_net.h>
46#include <lustre_import.h>
47#include <lustre_export.h>
48#include <obd.h>
49#include <obd_cksum.h>
50#include <obd_class.h>
51
52#include "ptlrpc_internal.h"
53
54struct 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 */
63static void __import_set_state(struct obd_import *imp,
64 enum lustre_imp_state state)
65{
66 imp->imp_state = state;
67 imp->imp_state_hist[imp->imp_state_hist_idx].ish_state = state;
68 imp->imp_state_hist[imp->imp_state_hist_idx].ish_time =
69 cfs_time_current_sec();
70 imp->imp_state_hist_idx = (imp->imp_state_hist_idx + 1) %
71 IMP_STATE_HIST_LEN;
72}
73
74/* A CLOSED import should remain so. */
532118c0
KM		 75#define IMPORT_SET_STATE_NOLOCK(imp, state) \
76do { \
77 if (imp->imp_state != LUSTRE_IMP_CLOSED) { \
78 CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n", \
79 imp, obd2cli_tgt(imp->imp_obd), \
80 ptlrpc_import_state_name(imp->imp_state), \
81 ptlrpc_import_state_name(state)); \
82 __import_set_state(imp, state); \
83 } \
3949015e 84} while (0)
d7e09d03
PT		 85
86#define IMPORT_SET_STATE(imp, state) \
87do { \
88 spin_lock(&imp->imp_lock); \
89 IMPORT_SET_STATE_NOLOCK(imp, state); \
90 spin_unlock(&imp->imp_lock); \
3949015e 91} while (0)
d7e09d03
PT		 92
93
94static int ptlrpc_connect_interpret(const struct lu_env *env,
95 struct ptlrpc_request *request,
96 void * data, int rc);
97int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
98
99/* Only this function is allowed to change the import state when it is
100 * CLOSED. I would rather refcount the import and free it after
101 * disconnection like we do with exports. To do that, the client_obd
102 * will need to save the peer info somewhere other than in the import,
103 * though. */
104int ptlrpc_init_import(struct obd_import *imp)
105{
106 spin_lock(&imp->imp_lock);
107
108 imp->imp_generation++;
109 imp->imp_state = LUSTRE_IMP_NEW;
110
111 spin_unlock(&imp->imp_lock);
112
113 return 0;
114}
115EXPORT_SYMBOL(ptlrpc_init_import);
116
117#define UUID_STR "_UUID"
118void deuuidify(char *uuid, const char *prefix, char **uuid_start, int *uuid_len)
119{
120 *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
121 ? uuid : uuid + strlen(prefix);
122
123 *uuid_len = strlen(*uuid_start);
124
125 if (*uuid_len < strlen(UUID_STR))
126 return;
127
128 if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
129 UUID_STR, strlen(UUID_STR)))
130 *uuid_len -= strlen(UUID_STR);
131}
132EXPORT_SYMBOL(deuuidify);
133
134/**
135 * Returns true if import was FULL, false if import was already not
136 * connected.
137 * @imp - import to be disconnected
138 * @conn_cnt - connection count (epoch) of the request that timed out
139 * and caused the disconnection. In some cases, multiple
140 * inflight requests can fail to a single target (e.g. OST
141 * bulk requests) and if one has already caused a reconnection
142 * (increasing the import->conn_cnt) the older failure should
143 * not also cause a reconnection. If zero it forces a reconnect.
144 */
145int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
146{
147 int rc = 0;
148
149 spin_lock(&imp->imp_lock);
150
151 if (imp->imp_state == LUSTRE_IMP_FULL &&
152 (conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
153 char *target_start;
154 int target_len;
155
156 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
157 &target_start, &target_len);
158
159 if (imp->imp_replayable) {
160 LCONSOLE_WARN("%s: Connection to %.*s (at %s) was "
161 "lost; in progress operations using this "
162 "service will wait for recovery to complete\n",
163 imp->imp_obd->obd_name, target_len, target_start,
164 libcfs_nid2str(imp->imp_connection->c_peer.nid));
165 } else {
166 LCONSOLE_ERROR_MSG(0x166, "%s: Connection to "
167 "%.*s (at %s) was lost; in progress "
168 "operations using this service will fail\n",
169 imp->imp_obd->obd_name,
170 target_len, target_start,
171 libcfs_nid2str(imp->imp_connection->c_peer.nid));
172 }
d7e09d03
PT		 173 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
174 spin_unlock(&imp->imp_lock);
175
176 if (obd_dump_on_timeout)
177 libcfs_debug_dumplog();
178
179 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
180 rc = 1;
181 } else {
182 spin_unlock(&imp->imp_lock);
183 CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
184 imp->imp_client->cli_name, imp,
185 (imp->imp_state == LUSTRE_IMP_FULL &&
186 imp->imp_conn_cnt > conn_cnt) ?
187 "reconnected" : "not connected", imp->imp_conn_cnt,
188 conn_cnt, ptlrpc_import_state_name(imp->imp_state));
189 }
190
191 return rc;
192}
193
194/* Must be called with imp_lock held! */
195static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
196{
d7e09d03
PT		 197 LASSERT(spin_is_locked(&imp->imp_lock));
198
199 CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
200 imp->imp_invalid = 1;
201 imp->imp_generation++;
202 spin_unlock(&imp->imp_lock);
203
204 ptlrpc_abort_inflight(imp);
205 obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
d7e09d03
PT		 206}
207
208/*
209 * This acts as a barrier; all existing requests are rejected, and
210 * no new requests will be accepted until the import is valid again.
211 */
212void ptlrpc_deactivate_import(struct obd_import *imp)
213{
214 spin_lock(&imp->imp_lock);
215 ptlrpc_deactivate_and_unlock_import(imp);
216}
217EXPORT_SYMBOL(ptlrpc_deactivate_import);
218
219static unsigned int
220ptlrpc_inflight_deadline(struct ptlrpc_request *req, time_t now)
221{
222 long dl;
223
224 if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
225 (req->rq_phase == RQ_PHASE_BULK) ||
226 (req->rq_phase == RQ_PHASE_NEW)))
227 return 0;
228
229 if (req->rq_timedout)
230 return 0;
231
232 if (req->rq_phase == RQ_PHASE_NEW)
233 dl = req->rq_sent;
234 else
235 dl = req->rq_deadline;
236
237 if (dl <= now)
238 return 0;
239
240 return dl - now;
241}
242
243static unsigned int ptlrpc_inflight_timeout(struct obd_import *imp)
244{
245 time_t now = cfs_time_current_sec();
246 struct list_head *tmp, *n;
247 struct ptlrpc_request *req;
248 unsigned int timeout = 0;
249
250 spin_lock(&imp->imp_lock);
251 list_for_each_safe(tmp, n, &imp->imp_sending_list) {
252 req = list_entry(tmp, struct ptlrpc_request, rq_list);
253 timeout = max(ptlrpc_inflight_deadline(req, now), timeout);
254 }
255 spin_unlock(&imp->imp_lock);
256 return timeout;
257}
258
259/**
260 * This function will invalidate the import, if necessary, then block
261 * for all the RPC completions, and finally notify the obd to
262 * invalidate its state (ie cancel locks, clear pending requests,
263 * etc).
264 */
265void ptlrpc_invalidate_import(struct obd_import *imp)
266{
267 struct list_head *tmp, *n;
268 struct ptlrpc_request *req;
269 struct l_wait_info lwi;
270 unsigned int timeout;
271 int rc;
272
273 atomic_inc(&imp->imp_inval_count);
274
275 if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
276 ptlrpc_deactivate_import(imp);
277
278 LASSERT(imp->imp_invalid);
279
280 /* Wait forever until inflight == 0. We really can't do it another
281 * way because in some cases we need to wait for very long reply
282 * unlink. We can't do anything before that because there is really
283 * no guarantee that some rdma transfer is not in progress right now. */
284 do {
285 /* Calculate max timeout for waiting on rpcs to error
286 * out. Use obd_timeout if calculated value is smaller
287 * than it. */
288 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
289 timeout = ptlrpc_inflight_timeout(imp);
290 timeout += timeout / 3;
291
292 if (timeout == 0)
293 timeout = obd_timeout;
294 } else {
295 /* decrease the interval to increase race condition */
296 timeout = 1;
297 }
298
299 CDEBUG(D_RPCTRACE,"Sleeping %d sec for inflight to error out\n",
300 timeout);
301
302 /* Wait for all requests to error out and call completion
303 * callbacks. Cap it at obd_timeout -- these should all
304 * have been locally cancelled by ptlrpc_abort_inflight. */
305 lwi = LWI_TIMEOUT_INTERVAL(
306 cfs_timeout_cap(cfs_time_seconds(timeout)),
307 (timeout > 1)?cfs_time_seconds(1):cfs_time_seconds(1)/2,
308 NULL, NULL);
309 rc = l_wait_event(imp->imp_recovery_waitq,
310 (atomic_read(&imp->imp_inflight) == 0),
311 &lwi);
312 if (rc) {
313 const char *cli_tgt = obd2cli_tgt(imp->imp_obd);
314
315 CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
316 cli_tgt, rc,
317 atomic_read(&imp->imp_inflight));
318
319 spin_lock(&imp->imp_lock);
320 if (atomic_read(&imp->imp_inflight) == 0) {
321 int count = atomic_read(&imp->imp_unregistering);
322
323 /* We know that "unregistering" rpcs only can
324 * survive in sending or delaying lists (they
325 * maybe waiting for long reply unlink in
326 * sluggish nets). Let's check this. If there
327 * is no inflight and unregistering != 0, this
328 * is bug. */
329 LASSERTF(count == 0, "Some RPCs are still "
330 "unregistering: %d\n", count);
331
332 /* Let's save one loop as soon as inflight have
333 * dropped to zero. No new inflights possible at
334 * this point. */
335 rc = 0;
336 } else {
337 list_for_each_safe(tmp, n,
338 &imp->imp_sending_list) {
339 req = list_entry(tmp,
340 struct ptlrpc_request,
341 rq_list);
342 DEBUG_REQ(D_ERROR, req,
343 "still on sending list");
344 }
345 list_for_each_safe(tmp, n,
346 &imp->imp_delayed_list) {
347 req = list_entry(tmp,
348 struct ptlrpc_request,
349 rq_list);
350 DEBUG_REQ(D_ERROR, req,
351 "still on delayed list");
352 }
353
354 CERROR("%s: RPCs in \"%s\" phase found (%d). "
355 "Network is sluggish? Waiting them "
356 "to error out.\n", cli_tgt,
357 ptlrpc_phase2str(RQ_PHASE_UNREGISTERING),
358 atomic_read(&imp->
359 imp_unregistering));
360 }
361 spin_unlock(&imp->imp_lock);
362 }
363 } while (rc != 0);
364
365 /*
366 * Let's additionally check that no new rpcs added to import in
367 * "invalidate" state.
368 */
369 LASSERT(atomic_read(&imp->imp_inflight) == 0);
370 obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
371 sptlrpc_import_flush_all_ctx(imp);
372
373 atomic_dec(&imp->imp_inval_count);
374 wake_up_all(&imp->imp_recovery_waitq);
375}
376EXPORT_SYMBOL(ptlrpc_invalidate_import);
377
378/* unset imp_invalid */
379void ptlrpc_activate_import(struct obd_import *imp)
380{
381 struct obd_device *obd = imp->imp_obd;
382
383 spin_lock(&imp->imp_lock);
0b291b9a
HZ		 384 if (imp->imp_deactive != 0) {
385 spin_unlock(&imp->imp_lock);
386 return;
387 }
388
d7e09d03 389 imp->imp_invalid = 0;
d7e09d03
PT		 390 spin_unlock(&imp->imp_lock);
391 obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
392}
393EXPORT_SYMBOL(ptlrpc_activate_import);
394
395void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
396{
d7e09d03
PT		 397 LASSERT(!imp->imp_dlm_fake);
398
399 if (ptlrpc_set_import_discon(imp, conn_cnt)) {
400 if (!imp->imp_replayable) {
401 CDEBUG(D_HA, "import %s@%s for %s not replayable, "
402 "auto-deactivating\n",
403 obd2cli_tgt(imp->imp_obd),
404 imp->imp_connection->c_remote_uuid.uuid,
405 imp->imp_obd->obd_name);
406 ptlrpc_deactivate_import(imp);
407 }
408
409 CDEBUG(D_HA, "%s: waking up pinger\n",
410 obd2cli_tgt(imp->imp_obd));
411
412 spin_lock(&imp->imp_lock);
413 imp->imp_force_verify = 1;
414 spin_unlock(&imp->imp_lock);
415
416 ptlrpc_pinger_wake_up();
417 }
d7e09d03
PT		 418}
419EXPORT_SYMBOL(ptlrpc_fail_import);
420
421int ptlrpc_reconnect_import(struct obd_import *imp)
422{
423 ptlrpc_set_import_discon(imp, 0);
424 /* Force a new connect attempt */
425 ptlrpc_invalidate_import(imp);
426 /* Do a fresh connect next time by zeroing the handle */
427 ptlrpc_disconnect_import(imp, 1);
428 /* Wait for all invalidate calls to finish */
429 if (atomic_read(&imp->imp_inval_count) > 0) {
430 int rc;
431 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
432 rc = l_wait_event(imp->imp_recovery_waitq,
433 (atomic_read(&imp->imp_inval_count) == 0),
434 &lwi);
435 if (rc)
436 CERROR("Interrupted, inval=%d\n",
437 atomic_read(&imp->imp_inval_count));
438 }
439
440 /* Allow reconnect attempts */
441 imp->imp_obd->obd_no_recov = 0;
442 /* Remove 'invalid' flag */
443 ptlrpc_activate_import(imp);
444 /* Attempt a new connect */
445 ptlrpc_recover_import(imp, NULL, 0);
446 return 0;
447}
448EXPORT_SYMBOL(ptlrpc_reconnect_import);
449
450/**
451 * Connection on import \a imp is changed to another one (if more than one is
452 * present). We typically chose connection that we have not tried to connect to
453 * the longest
454 */
455static int import_select_connection(struct obd_import *imp)
456{
457 struct obd_import_conn *imp_conn = NULL, *conn;
458 struct obd_export *dlmexp;
459 char *target_start;
460 int target_len, tried_all = 1;
d7e09d03
PT		 461
462 spin_lock(&imp->imp_lock);
463
464 if (list_empty(&imp->imp_conn_list)) {
465 CERROR("%s: no connections available\n",
466 imp->imp_obd->obd_name);
467 spin_unlock(&imp->imp_lock);
0a3bdb00 468 return -EINVAL;
d7e09d03
PT		 469 }
470
471 list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
472 CDEBUG(D_HA, "%s: connect to NID %s last attempt "LPU64"\n",
473 imp->imp_obd->obd_name,
474 libcfs_nid2str(conn->oic_conn->c_peer.nid),
475 conn->oic_last_attempt);
476
477 /* If we have not tried this connection since
478 the last successful attempt, go with this one */
479 if ((conn->oic_last_attempt == 0) ||
480 cfs_time_beforeq_64(conn->oic_last_attempt,
481 imp->imp_last_success_conn)) {
482 imp_conn = conn;
483 tried_all = 0;
484 break;
485 }
486
487 /* If all of the connections have already been tried
488 since the last successful connection; just choose the
489 least recently used */
490 if (!imp_conn)
491 imp_conn = conn;
492 else if (cfs_time_before_64(conn->oic_last_attempt,
493 imp_conn->oic_last_attempt))
494 imp_conn = conn;
495 }
496
497 /* if not found, simply choose the current one */
498 if (!imp_conn || imp->imp_force_reconnect) {
499 LASSERT(imp->imp_conn_current);
500 imp_conn = imp->imp_conn_current;
501 tried_all = 0;
502 }
503 LASSERT(imp_conn->oic_conn);
504
505 /* If we've tried everything, and we're back to the beginning of the
506 list, increase our timeout and try again. It will be reset when
507 we do finally connect. (FIXME: really we should wait for all network
508 state associated with the last connection attempt to drain before
509 trying to reconnect on it.) */
510 if (tried_all && (imp->imp_conn_list.next == &imp_conn->oic_item)) {
511 struct adaptive_timeout *at = &imp->imp_at.iat_net_latency;
512 if (at_get(at) < CONNECTION_SWITCH_MAX) {
513 at_measured(at, at_get(at) + CONNECTION_SWITCH_INC);
514 if (at_get(at) > CONNECTION_SWITCH_MAX)
515 at_reset(at, CONNECTION_SWITCH_MAX);
516 }
517 LASSERT(imp_conn->oic_last_attempt);
518 CDEBUG(D_HA, "%s: tried all connections, increasing latency "
519 "to %ds\n", imp->imp_obd->obd_name, at_get(at));
520 }
521
522 imp_conn->oic_last_attempt = cfs_time_current_64();
523
524 /* switch connection, don't mind if it's same as the current one */
525 if (imp->imp_connection)
526 ptlrpc_connection_put(imp->imp_connection);
527 imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
528
529 dlmexp = class_conn2export(&imp->imp_dlm_handle);
530 LASSERT(dlmexp != NULL);
531 if (dlmexp->exp_connection)
532 ptlrpc_connection_put(dlmexp->exp_connection);
533 dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
534 class_export_put(dlmexp);
535
536 if (imp->imp_conn_current != imp_conn) {
537 if (imp->imp_conn_current) {
538 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
539 &target_start, &target_len);
540
541 CDEBUG(D_HA, "%s: Connection changing to"
542 " %.*s (at %s)\n",
543 imp->imp_obd->obd_name,
544 target_len, target_start,
545 libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
546 }
547
548 imp->imp_conn_current = imp_conn;
549 }
550
551 CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
552 imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
553 libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
554
555 spin_unlock(&imp->imp_lock);
556
0a3bdb00 557 return 0;
d7e09d03
PT		 558}
559
560/*
561 * must be called under imp_lock
562 */
563static int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
564{
565 struct ptlrpc_request *req;
566 struct list_head *tmp;
567
63d42578
HZ		 568 /* The requests in committed_list always have smaller transnos than
569 * the requests in replay_list */
570 if (!list_empty(&imp->imp_committed_list)) {
571 tmp = imp->imp_committed_list.next;
572 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
573 *transno = req->rq_transno;
574 if (req->rq_transno == 0) {
575 DEBUG_REQ(D_ERROR, req,
576 "zero transno in committed_list");
577 LBUG();
578 }
579 return 1;
d7e09d03 580 }
63d42578
HZ		 581 if (!list_empty(&imp->imp_replay_list)) {
582 tmp = imp->imp_replay_list.next;
583 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
584 *transno = req->rq_transno;
585 if (req->rq_transno == 0) {
586 DEBUG_REQ(D_ERROR, req, "zero transno in replay_list");
587 LBUG();
588 }
589 return 1;
590 }
591 return 0;
d7e09d03
PT		 592}
593
594/**
595 * Attempt to (re)connect import \a imp. This includes all preparations,
596 * initializing CONNECT RPC request and passing it to ptlrpcd for
597 * actual sending.
598 * Returns 0 on success or error code.
599 */
600int ptlrpc_connect_import(struct obd_import *imp)
601{
602 struct obd_device *obd = imp->imp_obd;
603 int initial_connect = 0;
604 int set_transno = 0;
605 __u64 committed_before_reconnect = 0;
606 struct ptlrpc_request *request;
607 char *bufs[] = { NULL,
608 obd2cli_tgt(imp->imp_obd),
609 obd->obd_uuid.uuid,
610 (char *)&imp->imp_dlm_handle,
611 (char *)&imp->imp_connect_data };
612 struct ptlrpc_connect_async_args *aa;
613 int rc;
d7e09d03
PT		 614
615 spin_lock(&imp->imp_lock);
616 if (imp->imp_state == LUSTRE_IMP_CLOSED) {
617 spin_unlock(&imp->imp_lock);
618 CERROR("can't connect to a closed import\n");
0a3bdb00 619 return -EINVAL;
d7e09d03
PT		 620 } else if (imp->imp_state == LUSTRE_IMP_FULL) {
621 spin_unlock(&imp->imp_lock);
622 CERROR("already connected\n");
0a3bdb00 623 return 0;
d7e09d03
PT		 624 } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
625 spin_unlock(&imp->imp_lock);
626 CERROR("already connecting\n");
0a3bdb00 627 return -EALREADY;
d7e09d03
PT		 628 }
629
630 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
631
632 imp->imp_conn_cnt++;
633 imp->imp_resend_replay = 0;
634
635 if (!lustre_handle_is_used(&imp->imp_remote_handle))
636 initial_connect = 1;
637 else
638 committed_before_reconnect = imp->imp_peer_committed_transno;
639
640 set_transno = ptlrpc_first_transno(imp,
641 &imp->imp_connect_data.ocd_transno);
642 spin_unlock(&imp->imp_lock);
643
644 rc = import_select_connection(imp);
645 if (rc)
646 GOTO(out, rc);
647
648 rc = sptlrpc_import_sec_adapt(imp, NULL, 0);
649 if (rc)
650 GOTO(out, rc);
651
652 /* Reset connect flags to the originally requested flags, in case
653 * the server is updated on-the-fly we will get the new features. */
654 imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
655 /* Reset ocd_version each time so the server knows the exact versions */
656 imp->imp_connect_data.ocd_version = LUSTRE_VERSION_CODE;
657 imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
658 imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
659
660 rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
661 &obd->obd_uuid, &imp->imp_connect_data, NULL);
662 if (rc)
663 GOTO(out, rc);
664
665 request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
666 if (request == NULL)
667 GOTO(out, rc = -ENOMEM);
668
669 rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
670 imp->imp_connect_op, bufs, NULL);
671 if (rc) {
672 ptlrpc_request_free(request);
673 GOTO(out, rc);
674 }
675
676 /* Report the rpc service time to the server so that it knows how long
677 * to wait for clients to join recovery */
678 lustre_msg_set_service_time(request->rq_reqmsg,
679 at_timeout2est(request->rq_timeout));
680
681 /* The amount of time we give the server to process the connect req.
682 * import_select_connection will increase the net latency on
683 * repeated reconnect attempts to cover slow networks.
684 * We override/ignore the server rpc completion estimate here,
685 * which may be large if this is a reconnect attempt */
686 request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
687 lustre_msg_set_timeout(request->rq_reqmsg, request->rq_timeout);
688
689 lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
690
691 request->rq_no_resend = request->rq_no_delay = 1;
692 request->rq_send_state = LUSTRE_IMP_CONNECTING;
693 /* Allow a slightly larger reply for future growth compatibility */
694 req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
695 sizeof(struct obd_connect_data)+16*sizeof(__u64));
696 ptlrpc_request_set_replen(request);
697 request->rq_interpret_reply = ptlrpc_connect_interpret;
698
3949015e 699 CLASSERT(sizeof(*aa) <= sizeof(request->rq_async_args));
d7e09d03 700 aa = ptlrpc_req_async_args(request);
ec83e611 701 memset(aa, 0, sizeof(*aa));
d7e09d03
PT		 702
703 aa->pcaa_peer_committed = committed_before_reconnect;
704 aa->pcaa_initial_connect = initial_connect;
705
706 if (aa->pcaa_initial_connect) {
707 spin_lock(&imp->imp_lock);
708 imp->imp_replayable = 1;
709 spin_unlock(&imp->imp_lock);
710 lustre_msg_add_op_flags(request->rq_reqmsg,
711 MSG_CONNECT_INITIAL);
712 }
713
714 if (set_transno)
715 lustre_msg_add_op_flags(request->rq_reqmsg,
716 MSG_CONNECT_TRANSNO);
717
718 DEBUG_REQ(D_RPCTRACE, request, "(re)connect request (timeout %d)",
719 request->rq_timeout);
720 ptlrpcd_add_req(request, PDL_POLICY_ROUND, -1);
721 rc = 0;
722out:
723 if (rc != 0) {
724 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
725 }
726
0a3bdb00 727 return rc;
d7e09d03
PT		 728}
729EXPORT_SYMBOL(ptlrpc_connect_import);
730
731static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
732{
733 int force_verify;
734
735 spin_lock(&imp->imp_lock);
736 force_verify = imp->imp_force_verify != 0;
737 spin_unlock(&imp->imp_lock);
738
739 if (force_verify)
740 ptlrpc_pinger_wake_up();
741}
742
743static int ptlrpc_busy_reconnect(int rc)
744{
745 return (rc == -EBUSY) || (rc == -EAGAIN);
746}
747
748/**
749 * interpret_reply callback for connect RPCs.
750 * Looks into returned status of connect operation and decides
751 * what to do with the import - i.e enter recovery, promote it to
752 * full state for normal operations of disconnect it due to an error.
753 */
754static int ptlrpc_connect_interpret(const struct lu_env *env,
755 struct ptlrpc_request *request,
756 void *data, int rc)
757{
758 struct ptlrpc_connect_async_args *aa = data;
759 struct obd_import *imp = request->rq_import;
760 struct client_obd *cli = &imp->imp_obd->u.cli;
761 struct lustre_handle old_hdl;
762 __u64 old_connect_flags;
763 int msg_flags;
764 struct obd_connect_data *ocd;
765 struct obd_export *exp;
766 int ret;
d7e09d03
PT		 767
768 spin_lock(&imp->imp_lock);
769 if (imp->imp_state == LUSTRE_IMP_CLOSED) {
770 imp->imp_connect_tried = 1;
771 spin_unlock(&imp->imp_lock);
0a3bdb00 772 return 0;
d7e09d03
PT		 773 }
774
775 if (rc) {
776 /* if this reconnect to busy export - not need select new target
777 * for connecting*/
778 imp->imp_force_reconnect = ptlrpc_busy_reconnect(rc);
779 spin_unlock(&imp->imp_lock);
780 ptlrpc_maybe_ping_import_soon(imp);
781 GOTO(out, rc);
782 }
783 spin_unlock(&imp->imp_lock);
784
785 LASSERT(imp->imp_conn_current);
786
787 msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
788
789 ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
790 RCL_SERVER);
791 /* server replied obd_connect_data is always bigger */
792 ocd = req_capsule_server_sized_get(&request->rq_pill,
793 &RMF_CONNECT_DATA, ret);
794
795 if (ocd == NULL) {
796 CERROR("%s: no connect data from server\n",
797 imp->imp_obd->obd_name);
798 rc = -EPROTO;
799 GOTO(out, rc);
800 }
801
802 spin_lock(&imp->imp_lock);
803
804 /* All imports are pingable */
805 imp->imp_pingable = 1;
806 imp->imp_force_reconnect = 0;
807 imp->imp_force_verify = 0;
808
809 imp->imp_connect_data = *ocd;
810
811 CDEBUG(D_HA, "%s: connect to target with instance %u\n",
812 imp->imp_obd->obd_name, ocd->ocd_instance);
813 exp = class_conn2export(&imp->imp_dlm_handle);
814
815 spin_unlock(&imp->imp_lock);
816
817 /* check that server granted subset of flags we asked for. */
818 if ((ocd->ocd_connect_flags & imp->imp_connect_flags_orig) !=
819 ocd->ocd_connect_flags) {
820 CERROR("%s: Server didn't granted asked subset of flags: "
821 "asked="LPX64" grranted="LPX64"\n",
822 imp->imp_obd->obd_name,imp->imp_connect_flags_orig,
823 ocd->ocd_connect_flags);
824 GOTO(out, rc = -EPROTO);
825 }
826
827 if (!exp) {
828 /* This could happen if export is cleaned during the
829 connect attempt */
830 CERROR("%s: missing export after connect\n",
831 imp->imp_obd->obd_name);
832 GOTO(out, rc = -ENODEV);
833 }
834 old_connect_flags = exp_connect_flags(exp);
835 exp->exp_connect_data = *ocd;
836 imp->imp_obd->obd_self_export->exp_connect_data = *ocd;
837 class_export_put(exp);
838
839 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
840
841 if (aa->pcaa_initial_connect) {
842 spin_lock(&imp->imp_lock);
843 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
844 imp->imp_replayable = 1;
845 spin_unlock(&imp->imp_lock);
846 CDEBUG(D_HA, "connected to replayable target: %s\n",
847 obd2cli_tgt(imp->imp_obd));
848 } else {
849 imp->imp_replayable = 0;
850 spin_unlock(&imp->imp_lock);
851 }
852
853 /* if applies, adjust the imp->imp_msg_magic here
854 * according to reply flags */
855
856 imp->imp_remote_handle =
857 *lustre_msg_get_handle(request->rq_repmsg);
858
859 /* Initial connects are allowed for clients with non-random
860 * uuids when servers are in recovery. Simply signal the
861 * servers replay is complete and wait in REPLAY_WAIT. */
862 if (msg_flags & MSG_CONNECT_RECOVERING) {
863 CDEBUG(D_HA, "connect to %s during recovery\n",
864 obd2cli_tgt(imp->imp_obd));
865 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
866 } else {
867 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
868 ptlrpc_activate_import(imp);
869 }
870
871 GOTO(finish, rc = 0);
872 }
873
874 /* Determine what recovery state to move the import to. */
875 if (MSG_CONNECT_RECONNECT & msg_flags) {
876 memset(&old_hdl, 0, sizeof(old_hdl));
877 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
3949015e 878 sizeof(old_hdl))) {
d7e09d03
PT		 879 LCONSOLE_WARN("Reconnect to %s (at @%s) failed due "
880 "bad handle "LPX64"\n",
881 obd2cli_tgt(imp->imp_obd),
882 imp->imp_connection->c_remote_uuid.uuid,
883 imp->imp_dlm_handle.cookie);
884 GOTO(out, rc = -ENOTCONN);
885 }
886
887 if (memcmp(&imp->imp_remote_handle,
888 lustre_msg_get_handle(request->rq_repmsg),
889 sizeof(imp->imp_remote_handle))) {
890 int level = msg_flags & MSG_CONNECT_RECOVERING ?
891 D_HA : D_WARNING;
892
893 /* Bug 16611/14775: if server handle have changed,
894 * that means some sort of disconnection happened.
895 * If the server is not in recovery, that also means it
896 * already erased all of our state because of previous
897 * eviction. If it is in recovery - we are safe to
898 * participate since we can reestablish all of our state
899 * with server again */
900 if ((MSG_CONNECT_RECOVERING & msg_flags)) {
901 CDEBUG(level,"%s@%s changed server handle from "
902 LPX64" to "LPX64
903 " but is still in recovery\n",
904 obd2cli_tgt(imp->imp_obd),
905 imp->imp_connection->c_remote_uuid.uuid,
906 imp->imp_remote_handle.cookie,
907 lustre_msg_get_handle(
908 request->rq_repmsg)->cookie);
909 } else {
910 LCONSOLE_WARN("Evicted from %s (at %s) "
911 "after server handle changed from "
912 LPX64" to "LPX64"\n",
913 obd2cli_tgt(imp->imp_obd),
914 imp->imp_connection-> \
915 c_remote_uuid.uuid,
916 imp->imp_remote_handle.cookie,
917 lustre_msg_get_handle(
918 request->rq_repmsg)->cookie);
919 }
920
921
922 imp->imp_remote_handle =
923 *lustre_msg_get_handle(request->rq_repmsg);
924
925 if (!(MSG_CONNECT_RECOVERING & msg_flags)) {
926 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
927 GOTO(finish, rc = 0);
928 }
929
930 } else {
931 CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
932 obd2cli_tgt(imp->imp_obd),
933 imp->imp_connection->c_remote_uuid.uuid);
934 }
935
936 if (imp->imp_invalid) {
937 CDEBUG(D_HA, "%s: reconnected but import is invalid; "
938 "marking evicted\n", imp->imp_obd->obd_name);
939 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
940 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
941 CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
942 imp->imp_obd->obd_name,
943 obd2cli_tgt(imp->imp_obd));
944
945 spin_lock(&imp->imp_lock);
946 imp->imp_resend_replay = 1;
947 spin_unlock(&imp->imp_lock);
948
949 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
950 } else {
951 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
952 }
953 } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
954 LASSERT(imp->imp_replayable);
955 imp->imp_remote_handle =
956 *lustre_msg_get_handle(request->rq_repmsg);
957 imp->imp_last_replay_transno = 0;
958 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
959 } else {
960 DEBUG_REQ(D_HA, request, "%s: evicting (reconnect/recover flags"
961 " not set: %x)", imp->imp_obd->obd_name, msg_flags);
962 imp->imp_remote_handle =
963 *lustre_msg_get_handle(request->rq_repmsg);
964 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
965 }
966
967 /* Sanity checks for a reconnected import. */
968 if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
969 CERROR("imp_replayable flag does not match server "
970 "after reconnect. We should LBUG right here.\n");
971 }
972
973 if (lustre_msg_get_last_committed(request->rq_repmsg) > 0 &&
974 lustre_msg_get_last_committed(request->rq_repmsg) <
975 aa->pcaa_peer_committed) {
976 CERROR("%s went back in time (transno "LPD64
977 " was previously committed, server now claims "LPD64
978 ")! See https://bugzilla.lustre.org/show_bug.cgi?"
979 "id=9646\n",
980 obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
981 lustre_msg_get_last_committed(request->rq_repmsg));
982 }
983
984finish:
985 rc = ptlrpc_import_recovery_state_machine(imp);
986 if (rc != 0) {
987 if (rc == -ENOTCONN) {
988 CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
989 "invalidating and reconnecting\n",
990 obd2cli_tgt(imp->imp_obd),
991 imp->imp_connection->c_remote_uuid.uuid);
992 ptlrpc_connect_import(imp);
993 imp->imp_connect_tried = 1;
0a3bdb00 994 return 0;
d7e09d03
PT		 995 }
996 } else {
997
998 spin_lock(&imp->imp_lock);
999 list_del(&imp->imp_conn_current->oic_item);
1000 list_add(&imp->imp_conn_current->oic_item,
1001 &imp->imp_conn_list);
1002 imp->imp_last_success_conn =
1003 imp->imp_conn_current->oic_last_attempt;
1004
1005 spin_unlock(&imp->imp_lock);
1006
1007 if (!ocd->ocd_ibits_known &&
1008 ocd->ocd_connect_flags & OBD_CONNECT_IBITS)
1009 CERROR("Inodebits aware server returned zero compatible"
1010 " bits?\n");
1011
1012 if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1013 (ocd->ocd_version > LUSTRE_VERSION_CODE +
1014 LUSTRE_VERSION_OFFSET_WARN ||
1015 ocd->ocd_version < LUSTRE_VERSION_CODE -
1016 LUSTRE_VERSION_OFFSET_WARN)) {
1017 /* Sigh, some compilers do not like #ifdef in the middle
1018 of macro arguments */
1019 const char *older = "older. Consider upgrading server "
1020 "or downgrading client";
1021 const char *newer = "newer than client version. "
1022 "Consider upgrading client";
1023
1024 LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
1025 "is much %s (%s)\n",
1026 obd2cli_tgt(imp->imp_obd),
1027 OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1028 OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1029 OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1030 OBD_OCD_VERSION_FIX(ocd->ocd_version),
1031 ocd->ocd_version > LUSTRE_VERSION_CODE ?
1032 newer : older, LUSTRE_VERSION_STRING);
1033 }
1034
1035#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 50, 0)
1036 /* Check if server has LU-1252 fix applied to not always swab
1037 * the IR MNE entries. Do this only once per connection. This
1038 * fixup is version-limited, because we don't want to carry the
1039 * OBD_CONNECT_MNE_SWAB flag around forever, just so long as we
1040 * need interop with unpatched 2.2 servers. For newer servers,
1041 * the client will do MNE swabbing only as needed. LU-1644 */
1042 if (unlikely((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1043 !(ocd->ocd_connect_flags & OBD_CONNECT_MNE_SWAB) &&
1044 OBD_OCD_VERSION_MAJOR(ocd->ocd_version) == 2 &&
1045 OBD_OCD_VERSION_MINOR(ocd->ocd_version) == 2 &&
1046 OBD_OCD_VERSION_PATCH(ocd->ocd_version) < 55 &&
1047 strcmp(imp->imp_obd->obd_type->typ_name,
1048 LUSTRE_MGC_NAME) == 0))
1049 imp->imp_need_mne_swab = 1;
1050 else /* clear if server was upgraded since last connect */
1051 imp->imp_need_mne_swab = 0;
1052#else
1053#warning "LU-1644: Remove old OBD_CONNECT_MNE_SWAB fixup and imp_need_mne_swab"
1054#endif
1055
1056 if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
1057 /* We sent to the server ocd_cksum_types with bits set
1058 * for algorithms we understand. The server masked off
1059 * the checksum types it doesn't support */
1060 if ((ocd->ocd_cksum_types &
1061 cksum_types_supported_client()) == 0) {
1062 LCONSOLE_WARN("The negotiation of the checksum "
b6da17f3 1063 "algorithm to use with server %s "
d7e09d03
PT		 1064 "failed (%x/%x), disabling "
1065 "checksums\n",
1066 obd2cli_tgt(imp->imp_obd),
1067 ocd->ocd_cksum_types,
1068 cksum_types_supported_client());
1069 cli->cl_checksum = 0;
1070 cli->cl_supp_cksum_types = OBD_CKSUM_ADLER;
1071 } else {
1072 cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
1073 }
1074 } else {
1075 /* The server does not support OBD_CONNECT_CKSUM.
1076 * Enforce ADLER for backward compatibility*/
1077 cli->cl_supp_cksum_types = OBD_CKSUM_ADLER;
1078 }
1079 cli->cl_cksum_type =cksum_type_select(cli->cl_supp_cksum_types);
1080
1081 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE)
1082 cli->cl_max_pages_per_rpc =
1083 min(ocd->ocd_brw_size >> PAGE_CACHE_SHIFT,
1084 cli->cl_max_pages_per_rpc);
1085 else if (imp->imp_connect_op == MDS_CONNECT ||
1086 imp->imp_connect_op == MGS_CONNECT)
1087 cli->cl_max_pages_per_rpc = 1;
1088
1089 /* Reset ns_connect_flags only for initial connect. It might be
1090 * changed in while using FS and if we reset it in reconnect
1091 * this leads to losing user settings done before such as
1092 * disable lru_resize, etc. */
1093 if (old_connect_flags != exp_connect_flags(exp) ||
1094 aa->pcaa_initial_connect) {
1095 CDEBUG(D_HA, "%s: Resetting ns_connect_flags to server "
1096 "flags: "LPX64"\n", imp->imp_obd->obd_name,
1097 ocd->ocd_connect_flags);
1098 imp->imp_obd->obd_namespace->ns_connect_flags =
1099 ocd->ocd_connect_flags;
1100 imp->imp_obd->obd_namespace->ns_orig_connect_flags =
1101 ocd->ocd_connect_flags;
1102 }
1103
1104 if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
1105 (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1106 /* We need a per-message support flag, because
1107 a. we don't know if the incoming connect reply
1108 supports AT or not (in reply_in_callback)
1109 until we unpack it.
1110 b. failovered server means export and flags are gone
1111 (in ptlrpc_send_reply).
1112 Can only be set when we know AT is supported at
1113 both ends */
1114 imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1115 else
1116 imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1117
1118 if ((ocd->ocd_connect_flags & OBD_CONNECT_FULL20) &&
1119 (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1120 imp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1121 else
1122 imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1123
1124 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
1125 (cli->cl_max_pages_per_rpc > 0));
1126 }
1127
1128out:
1129 imp->imp_connect_tried = 1;
1130
1131 if (rc != 0) {
1132 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
1133 if (rc == -EACCES) {
1134 /*
1135 * Give up trying to reconnect
1136 * EACCES means client has no permission for connection
1137 */
1138 imp->imp_obd->obd_no_recov = 1;
1139 ptlrpc_deactivate_import(imp);
1140 }
1141
1142 if (rc == -EPROTO) {
1143 struct obd_connect_data *ocd;
1144
1145 /* reply message might not be ready */
1146 if (request->rq_repmsg == NULL)
0a3bdb00 1147 return -EPROTO;
d7e09d03
PT		 1148
1149 ocd = req_capsule_server_get(&request->rq_pill,
1150 &RMF_CONNECT_DATA);
1151 if (ocd &&
1152 (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1153 (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
532118c0
KM		 1154 /*
1155 * Actually servers are only supposed to refuse
1156 * connection from liblustre clients, so we
1157 * should never see this from VFS context
1158 */
d7e09d03
PT		 1159 LCONSOLE_ERROR_MSG(0x16a, "Server %s version "
1160 "(%d.%d.%d.%d)"
1161 " refused connection from this client "
1162 "with an incompatible version (%s). "
1163 "Client must be recompiled\n",
1164 obd2cli_tgt(imp->imp_obd),
1165 OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1166 OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1167 OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1168 OBD_OCD_VERSION_FIX(ocd->ocd_version),
1169 LUSTRE_VERSION_STRING);
1170 ptlrpc_deactivate_import(imp);
1171 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
1172 }
0a3bdb00 1173 return -EPROTO;
d7e09d03
PT		 1174 }
1175
1176 ptlrpc_maybe_ping_import_soon(imp);
1177
1178 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
1179 obd2cli_tgt(imp->imp_obd),
1180 (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
1181 }
1182
1183 wake_up_all(&imp->imp_recovery_waitq);
0a3bdb00 1184 return rc;
d7e09d03
PT		 1185}
1186
1187/**
1188 * interpret callback for "completed replay" RPCs.
1189 * \see signal_completed_replay
1190 */
1191static int completed_replay_interpret(const struct lu_env *env,
1192 struct ptlrpc_request *req,
1193 void * data, int rc)
1194{
d7e09d03
PT		 1195 atomic_dec(&req->rq_import->imp_replay_inflight);
1196 if (req->rq_status == 0 &&
1197 !req->rq_import->imp_vbr_failed) {
1198 ptlrpc_import_recovery_state_machine(req->rq_import);
1199 } else {
1200 if (req->rq_import->imp_vbr_failed) {
1201 CDEBUG(D_WARNING,
1202 "%s: version recovery fails, reconnecting\n",
1203 req->rq_import->imp_obd->obd_name);
1204 } else {
1205 CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
1206 "reconnecting\n",
1207 req->rq_import->imp_obd->obd_name,
1208 req->rq_status);
1209 }
1210 ptlrpc_connect_import(req->rq_import);
1211 }
1212
0a3bdb00 1213 return 0;
d7e09d03
PT		 1214}
1215
1216/**
1217 * Let server know that we have no requests to replay anymore.
1218 * Achieved by just sending a PING request
1219 */
1220static int signal_completed_replay(struct obd_import *imp)
1221{
1222 struct ptlrpc_request *req;
d7e09d03
PT		 1223
1224 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_FINISH_REPLAY)))
0a3bdb00 1225 return 0;
d7e09d03
PT		 1226
1227 LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1228 atomic_inc(&imp->imp_replay_inflight);
1229
1230 req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
1231 OBD_PING);
1232 if (req == NULL) {
1233 atomic_dec(&imp->imp_replay_inflight);
0a3bdb00 1234 return -ENOMEM;
d7e09d03
PT		 1235 }
1236
1237 ptlrpc_request_set_replen(req);
1238 req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
1239 lustre_msg_add_flags(req->rq_reqmsg,
1240 MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
1241 if (AT_OFF)
1242 req->rq_timeout *= 3;
1243 req->rq_interpret_reply = completed_replay_interpret;
1244
1245 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
0a3bdb00 1246 return 0;
d7e09d03
PT		 1247}
1248
1249/**
1250 * In kernel code all import invalidation happens in its own
1251 * separate thread, so that whatever application happened to encounter
1252 * a problem could still be killed or otherwise continue
1253 */
1254static int ptlrpc_invalidate_import_thread(void *data)
1255{
1256 struct obd_import *imp = data;
1257
d7e09d03
PT		 1258 unshare_fs_struct();
1259
1260 CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
1261 imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1262 imp->imp_connection->c_remote_uuid.uuid);
1263
1264 ptlrpc_invalidate_import(imp);
1265
1266 if (obd_dump_on_eviction) {
1267 CERROR("dump the log upon eviction\n");
1268 libcfs_debug_dumplog();
1269 }
1270
1271 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1272 ptlrpc_import_recovery_state_machine(imp);
1273
1274 class_import_put(imp);
0a3bdb00 1275 return 0;
d7e09d03
PT		 1276}
1277
1278/**
1279 * This is the state machine for client-side recovery on import.
1280 *
b6da17f3 1281 * Typically we have two possibly paths. If we came to server and it is not
d7e09d03
PT		 1282 * in recovery, we just enter IMP_EVICTED state, invalidate our import
1283 * state and reconnect from scratch.
1284 * If we came to server that is in recovery, we enter IMP_REPLAY import state.
1285 * We go through our list of requests to replay and send them to server one by
1286 * one.
1287 * After sending all request from the list we change import state to
1288 * IMP_REPLAY_LOCKS and re-request all the locks we believe we have from server
1289 * and also all the locks we don't yet have and wait for server to grant us.
1290 * After that we send a special "replay completed" request and change import
1291 * state to IMP_REPLAY_WAIT.
1292 * Upon receiving reply to that "replay completed" RPC we enter IMP_RECOVER
1293 * state and resend all requests from sending list.
1294 * After that we promote import to FULL state and send all delayed requests
1295 * and import is fully operational after that.
1296 *
1297 */
1298int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
1299{
1300 int rc = 0;
1301 int inflight;
1302 char *target_start;
1303 int target_len;
1304
d7e09d03
PT		 1305 if (imp->imp_state == LUSTRE_IMP_EVICTED) {
1306 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1307 &target_start, &target_len);
1308 /* Don't care about MGC eviction */
1309 if (strcmp(imp->imp_obd->obd_type->typ_name,
1310 LUSTRE_MGC_NAME) != 0) {
1311 LCONSOLE_ERROR_MSG(0x167, "%s: This client was evicted "
1312 "by %.*s; in progress operations "
1313 "using this service will fail.\n",
1314 imp->imp_obd->obd_name, target_len,
1315 target_start);
1316 }
1317 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
1318 obd2cli_tgt(imp->imp_obd),
1319 imp->imp_connection->c_remote_uuid.uuid);
1320 /* reset vbr_failed flag upon eviction */
1321 spin_lock(&imp->imp_lock);
1322 imp->imp_vbr_failed = 0;
1323 spin_unlock(&imp->imp_lock);
1324
1325 {
68b636b6 1326 struct task_struct *task;
d7e09d03
PT		 1327 /* bug 17802: XXX client_disconnect_export vs connect request
1328 * race. if client will evicted at this time, we start
1329 * invalidate thread without reference to import and import can
1330 * be freed at same time. */
1331 class_import_get(imp);
1332 task = kthread_run(ptlrpc_invalidate_import_thread, imp,
1333 "ll_imp_inval");
1334 if (IS_ERR(task)) {
1335 class_import_put(imp);
1336 CERROR("error starting invalidate thread: %d\n", rc);
1337 rc = PTR_ERR(task);
1338 } else {
1339 rc = 0;
1340 }
0a3bdb00 1341 return rc;
d7e09d03
PT		 1342 }
1343 }
1344
1345 if (imp->imp_state == LUSTRE_IMP_REPLAY) {
1346 CDEBUG(D_HA, "replay requested by %s\n",
1347 obd2cli_tgt(imp->imp_obd));
1348 rc = ptlrpc_replay_next(imp, &inflight);
1349 if (inflight == 0 &&
1350 atomic_read(&imp->imp_replay_inflight) == 0) {
1351 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
1352 rc = ldlm_replay_locks(imp);
1353 if (rc)
1354 GOTO(out, rc);
1355 }
1356 rc = 0;
1357 }
1358
1359 if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
1360 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1361 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
1362 rc = signal_completed_replay(imp);
1363 if (rc)
1364 GOTO(out, rc);
1365 }
1366
1367 }
1368
1369 if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
1370 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1371 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1372 }
1373 }
1374
1375 if (imp->imp_state == LUSTRE_IMP_RECOVER) {
1376 CDEBUG(D_HA, "reconnected to %s@%s\n",
1377 obd2cli_tgt(imp->imp_obd),
1378 imp->imp_connection->c_remote_uuid.uuid);
1379
1380 rc = ptlrpc_resend(imp);
1381 if (rc)
1382 GOTO(out, rc);
1383 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
1384 ptlrpc_activate_import(imp);
1385
1386 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1387 &target_start, &target_len);
1388 LCONSOLE_INFO("%s: Connection restored to %.*s (at %s)\n",
1389 imp->imp_obd->obd_name,
1390 target_len, target_start,
1391 libcfs_nid2str(imp->imp_connection->c_peer.nid));
1392 }
1393
1394 if (imp->imp_state == LUSTRE_IMP_FULL) {
1395 wake_up_all(&imp->imp_recovery_waitq);
1396 ptlrpc_wake_delayed(imp);
1397 }
1398
1399out:
0a3bdb00 1400 return rc;
d7e09d03
PT		 1401}
1402
1403int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1404{
1405 struct ptlrpc_request *req;
1406 int rq_opc, rc = 0;
d7e09d03 1407
88291a7a 1408 if (imp->imp_obd->obd_force)
d7e09d03
PT		 1409 GOTO(set_state, rc);
1410
1411 switch (imp->imp_connect_op) {
88291a7a
AD		 1412 case OST_CONNECT:
1413 rq_opc = OST_DISCONNECT;
1414 break;
1415 case MDS_CONNECT:
1416 rq_opc = MDS_DISCONNECT;
1417 break;
1418 case MGS_CONNECT:
1419 rq_opc = MGS_DISCONNECT;
1420 break;
d7e09d03 1421 default:
88291a7a
AD		 1422 rc = -EINVAL;
1423 CERROR("%s: don't know how to disconnect from %s "
1424 "(connect_op %d): rc = %d\n",
1425 imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1426 imp->imp_connect_op, rc);
1427 return rc;
d7e09d03
PT		 1428 }
1429
1430 if (ptlrpc_import_in_recovery(imp)) {
1431 struct l_wait_info lwi;
1432 cfs_duration_t timeout;
1433
d7e09d03
PT		 1434 if (AT_OFF) {
1435 if (imp->imp_server_timeout)
1436 timeout = cfs_time_seconds(obd_timeout / 2);
1437 else
1438 timeout = cfs_time_seconds(obd_timeout);
1439 } else {
1440 int idx = import_at_get_index(imp,
1441 imp->imp_client->cli_request_portal);
1442 timeout = cfs_time_seconds(
1443 at_get(&imp->imp_at.iat_service_estimate[idx]));
1444 }
1445
1446 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1447 back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1448 rc = l_wait_event(imp->imp_recovery_waitq,
1449 !ptlrpc_import_in_recovery(imp), &lwi);
1450
1451 }
1452
1453 spin_lock(&imp->imp_lock);
1454 if (imp->imp_state != LUSTRE_IMP_FULL)
1455 GOTO(out, 0);
d7e09d03
PT		 1456 spin_unlock(&imp->imp_lock);
1457
1458 req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
1459 LUSTRE_OBD_VERSION, rq_opc);
1460 if (req) {
1461 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1462 * it fails. We can get through the above with a down server
1463 * if the client doesn't know the server is gone yet. */
1464 req->rq_no_resend = 1;
1465
1466 /* We want client umounts to happen quickly, no matter the
1467 server state... */
1468 req->rq_timeout = min_t(int, req->rq_timeout,
1469 INITIAL_CONNECT_TIMEOUT);
1470
1471 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1472 req->rq_send_state = LUSTRE_IMP_CONNECTING;
1473 ptlrpc_request_set_replen(req);
1474 rc = ptlrpc_queue_wait(req);
1475 ptlrpc_req_finished(req);
1476 }
1477
1478set_state:
1479 spin_lock(&imp->imp_lock);
1480out:
1481 if (noclose)
1482 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1483 else
1484 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1485 memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1486 spin_unlock(&imp->imp_lock);
1487
88291a7a
AD		 1488 if (rc == -ETIMEDOUT || rc == -ENOTCONN || rc == -ESHUTDOWN)
1489 rc = 0;
1490
0a3bdb00 1491 return rc;
d7e09d03
PT		 1492}
1493EXPORT_SYMBOL(ptlrpc_disconnect_import);
1494
1495void ptlrpc_cleanup_imp(struct obd_import *imp)
1496{
d7e09d03
PT		 1497 spin_lock(&imp->imp_lock);
1498 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1499 imp->imp_generation++;
1500 spin_unlock(&imp->imp_lock);
1501 ptlrpc_abort_inflight(imp);
d7e09d03
PT		 1502}
1503EXPORT_SYMBOL(ptlrpc_cleanup_imp);
1504
1505/* Adaptive Timeout utils */
1506extern unsigned int at_min, at_max, at_history;
1507
1508/* Bin into timeslices using AT_BINS bins.
1509 This gives us a max of the last binlimit*AT_BINS secs without the storage,
1510 but still smoothing out a return to normalcy from a slow response.
1511 (E.g. remember the maximum latency in each minute of the last 4 minutes.) */
1512int at_measured(struct adaptive_timeout *at, unsigned int val)
1513{
1514 unsigned int old = at->at_current;
1515 time_t now = cfs_time_current_sec();
1516 time_t binlimit = max_t(time_t, at_history / AT_BINS, 1);
1517
1518 LASSERT(at);
1519 CDEBUG(D_OTHER, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
1520 val, at, now - at->at_binstart, at->at_current,
1521 at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
1522
1523 if (val == 0)
1524 /* 0's don't count, because we never want our timeout to
1525 drop to 0, and because 0 could mean an error */
1526 return 0;
1527
1528 spin_lock(&at->at_lock);
1529
1530 if (unlikely(at->at_binstart == 0)) {
1531 /* Special case to remove default from history */
1532 at->at_current = val;
1533 at->at_worst_ever = val;
1534 at->at_worst_time = now;
1535 at->at_hist[0] = val;
1536 at->at_binstart = now;
3949015e 1537 } else if (now - at->at_binstart < binlimit) {
d7e09d03
PT		 1538 /* in bin 0 */
1539 at->at_hist[0] = max(val, at->at_hist[0]);
1540 at->at_current = max(val, at->at_current);
1541 } else {
1542 int i, shift;
1543 unsigned int maxv = val;
1544 /* move bins over */
1545 shift = (now - at->at_binstart) / binlimit;
1546 LASSERT(shift > 0);
3949015e 1547 for (i = AT_BINS - 1; i >= 0; i--) {
d7e09d03
PT		 1548 if (i >= shift) {
1549 at->at_hist[i] = at->at_hist[i - shift];
1550 maxv = max(maxv, at->at_hist[i]);
1551 } else {
1552 at->at_hist[i] = 0;
1553 }
1554 }
1555 at->at_hist[0] = val;
1556 at->at_current = maxv;
1557 at->at_binstart += shift * binlimit;
1558 }
1559
1560 if (at->at_current > at->at_worst_ever) {
1561 at->at_worst_ever = at->at_current;
1562 at->at_worst_time = now;
1563 }
1564
1565 if (at->at_flags & AT_FLG_NOHIST)
1566 /* Only keep last reported val; keeping the rest of the history
1567 for proc only */
1568 at->at_current = val;
1569
1570 if (at_max > 0)
1571 at->at_current = min(at->at_current, at_max);
1572 at->at_current = max(at->at_current, at_min);
1573
1574 if (at->at_current != old)
1575 CDEBUG(D_OTHER, "AT %p change: old=%u new=%u delta=%d "
1576 "(val=%u) hist %u %u %u %u\n", at,
1577 old, at->at_current, at->at_current - old, val,
1578 at->at_hist[0], at->at_hist[1], at->at_hist[2],
1579 at->at_hist[3]);
1580
1581 /* if we changed, report the old value */
1582 old = (at->at_current != old) ? old : 0;
1583
1584 spin_unlock(&at->at_lock);
1585 return old;
1586}
1587
1588/* Find the imp_at index for a given portal; assign if space available */
1589int import_at_get_index(struct obd_import *imp, int portal)
1590{
1591 struct imp_at *at = &imp->imp_at;
1592 int i;
1593
1594 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1595 if (at->iat_portal[i] == portal)
1596 return i;
1597 if (at->iat_portal[i] == 0)
1598 /* unused */
1599 break;
1600 }
1601
1602 /* Not found in list, add it under a lock */
1603 spin_lock(&imp->imp_lock);
1604
1605 /* Check unused under lock */
1606 for (; i < IMP_AT_MAX_PORTALS; i++) {
1607 if (at->iat_portal[i] == portal)
1608 goto out;
1609 if (at->iat_portal[i] == 0)
1610 /* unused */
1611 break;
1612 }
1613
1614 /* Not enough portals? */
1615 LASSERT(i < IMP_AT_MAX_PORTALS);
1616
1617 at->iat_portal[i] = portal;
1618out:
1619 spin_unlock(&imp->imp_lock);
1620 return i;
1621}
Linux kernel - Deliverables
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