Whamcloud - gitweb
af93a29fff9eac2f2ba18384598c79815c880d1e
[fs/lustre-release.git] / 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, 2013, 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
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         imp->imp_state = state;
79         imp->imp_state_hist[imp->imp_state_hist_idx].ish_state = state;
80         imp->imp_state_hist[imp->imp_state_hist_idx].ish_time =
81                 cfs_time_current_sec();
82         imp->imp_state_hist_idx = (imp->imp_state_hist_idx + 1) %
83                 IMP_STATE_HIST_LEN;
84 }
85
86 /* A CLOSED import should remain so. */
87 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
88 do {                                                                           \
89         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
90                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
91                       imp, obd2cli_tgt(imp->imp_obd),                          \
92                       ptlrpc_import_state_name(imp->imp_state),                \
93                       ptlrpc_import_state_name(state));                        \
94                __import_set_state(imp, state);                                 \
95         }                                                                      \
96 } while(0)
97
98 #define IMPORT_SET_STATE(imp, state)                                    \
99 do {                                                                    \
100         spin_lock(&imp->imp_lock);                                      \
101         IMPORT_SET_STATE_NOLOCK(imp, state);                            \
102         spin_unlock(&imp->imp_lock);                                    \
103 } while(0)
104
105
106 static int ptlrpc_connect_interpret(const struct lu_env *env,
107                                     struct ptlrpc_request *request,
108                                     void * data, int rc);
109 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
110
111 /* Only this function is allowed to change the import state when it is
112  * CLOSED. I would rather refcount the import and free it after
113  * disconnection like we do with exports. To do that, the client_obd
114  * will need to save the peer info somewhere other than in the import,
115  * though. */
116 int ptlrpc_init_import(struct obd_import *imp)
117 {
118         spin_lock(&imp->imp_lock);
119
120         imp->imp_generation++;
121         imp->imp_state =  LUSTRE_IMP_NEW;
122
123         spin_unlock(&imp->imp_lock);
124
125         return 0;
126 }
127 EXPORT_SYMBOL(ptlrpc_init_import);
128
129 #define UUID_STR "_UUID"
130 void deuuidify(char *uuid, const char *prefix, char **uuid_start, int *uuid_len)
131 {
132         *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
133                 ? uuid : uuid + strlen(prefix);
134
135         *uuid_len = strlen(*uuid_start);
136
137         if (*uuid_len < strlen(UUID_STR))
138                 return;
139
140         if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
141                     UUID_STR, strlen(UUID_STR)))
142                 *uuid_len -= strlen(UUID_STR);
143 }
144 EXPORT_SYMBOL(deuuidify);
145
146 /**
147  * Returns true if import was FULL, false if import was already not
148  * connected.
149  * @imp - import to be disconnected
150  * @conn_cnt - connection count (epoch) of the request that timed out
151  *             and caused the disconnection.  In some cases, multiple
152  *             inflight requests can fail to a single target (e.g. OST
153  *             bulk requests) and if one has already caused a reconnection
154  *             (increasing the import->conn_cnt) the older failure should
155  *             not also cause a reconnection.  If zero it forces a reconnect.
156  */
157 int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
158 {
159         int rc = 0;
160
161         spin_lock(&imp->imp_lock);
162
163         if (imp->imp_state == LUSTRE_IMP_FULL &&
164             (conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
165                 char *target_start;
166                 int   target_len;
167
168                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
169                           &target_start, &target_len);
170
171                 if (imp->imp_replayable) {
172                         LCONSOLE_WARN("%s: Connection to %.*s (at %s) was "
173                                "lost; in progress operations using this "
174                                "service will wait for recovery to complete\n",
175                                imp->imp_obd->obd_name, target_len, target_start,
176                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
177                 } else {
178                         LCONSOLE_ERROR_MSG(0x166, "%s: Connection to "
179                                "%.*s (at %s) was lost; in progress "
180                                "operations using this service will fail\n",
181                                imp->imp_obd->obd_name,
182                                target_len, target_start,
183                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
184                 }
185                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
186                 spin_unlock(&imp->imp_lock);
187
188                 if (obd_dump_on_timeout)
189                         libcfs_debug_dumplog();
190
191                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
192                 rc = 1;
193         } else {
194                 spin_unlock(&imp->imp_lock);
195                 CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
196                        imp->imp_client->cli_name, imp,
197                        (imp->imp_state == LUSTRE_IMP_FULL &&
198                         imp->imp_conn_cnt > conn_cnt) ?
199                        "reconnected" : "not connected", imp->imp_conn_cnt,
200                        conn_cnt, ptlrpc_import_state_name(imp->imp_state));
201         }
202
203         return rc;
204 }
205
206 /* Must be called with imp_lock held! */
207 static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
208 {
209         ENTRY;
210         assert_spin_locked(&imp->imp_lock);
211
212         CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
213         imp->imp_invalid = 1;
214         imp->imp_generation++;
215         spin_unlock(&imp->imp_lock);
216
217         ptlrpc_abort_inflight(imp);
218         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
219
220         EXIT;
221 }
222
223 /*
224  * This acts as a barrier; all existing requests are rejected, and
225  * no new requests will be accepted until the import is valid again.
226  */
227 void ptlrpc_deactivate_import(struct obd_import *imp)
228 {
229         spin_lock(&imp->imp_lock);
230         ptlrpc_deactivate_and_unlock_import(imp);
231 }
232 EXPORT_SYMBOL(ptlrpc_deactivate_import);
233
234 static unsigned int
235 ptlrpc_inflight_deadline(struct ptlrpc_request *req, time_t now)
236 {
237         long dl;
238
239         if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
240               (req->rq_phase == RQ_PHASE_BULK) ||
241               (req->rq_phase == RQ_PHASE_NEW)))
242                 return 0;
243
244         if (req->rq_timedout)
245                 return 0;
246
247         if (req->rq_phase == RQ_PHASE_NEW)
248                 dl = req->rq_sent;
249         else
250                 dl = req->rq_deadline;
251
252         if (dl <= now)
253                 return 0;
254
255         return dl - now;
256 }
257
258 static unsigned int ptlrpc_inflight_timeout(struct obd_import *imp)
259 {
260         time_t now = cfs_time_current_sec();
261         struct list_head *tmp, *n;
262         struct ptlrpc_request *req;
263         unsigned int timeout = 0;
264
265         spin_lock(&imp->imp_lock);
266         list_for_each_safe(tmp, n, &imp->imp_sending_list) {
267                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
268                 timeout = max(ptlrpc_inflight_deadline(req, now), timeout);
269         }
270         spin_unlock(&imp->imp_lock);
271         return timeout;
272 }
273
274 /**
275  * This function will invalidate the import, if necessary, then block
276  * for all the RPC completions, and finally notify the obd to
277  * invalidate its state (ie cancel locks, clear pending requests,
278  * etc).
279  */
280 void ptlrpc_invalidate_import(struct obd_import *imp)
281 {
282         struct list_head *tmp, *n;
283         struct ptlrpc_request *req;
284         struct l_wait_info lwi;
285         unsigned int timeout;
286         int rc;
287
288         atomic_inc(&imp->imp_inval_count);
289
290         if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
291                 ptlrpc_deactivate_import(imp);
292
293         CFS_FAIL_TIMEOUT(OBD_FAIL_MGS_CONNECT_NET, 3 * cfs_fail_val / 2);
294         LASSERT(imp->imp_invalid);
295
296         /* Wait forever until inflight == 0. We really can't do it another
297          * way because in some cases we need to wait for very long reply
298          * unlink. We can't do anything before that because there is really
299          * no guarantee that some rdma transfer is not in progress right now. */
300         do {
301                 /* Calculate max timeout for waiting on rpcs to error
302                  * out. Use obd_timeout if calculated value is smaller
303                  * than it. */
304                 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
305                         timeout = ptlrpc_inflight_timeout(imp);
306                         timeout += timeout / 3;
307
308                         if (timeout == 0)
309                                 timeout = obd_timeout;
310                 } else {
311                         /* decrease the interval to increase race condition */
312                         timeout = 1;
313                 }
314
315                 CDEBUG(D_RPCTRACE,"Sleeping %d sec for inflight to error out\n",
316                        timeout);
317
318                 /* Wait for all requests to error out and call completion
319                  * callbacks. Cap it at obd_timeout -- these should all
320                  * have been locally cancelled by ptlrpc_abort_inflight. */
321                 lwi = LWI_TIMEOUT_INTERVAL(
322                         cfs_timeout_cap(cfs_time_seconds(timeout)),
323                         (timeout > 1)?cfs_time_seconds(1):cfs_time_seconds(1)/2,
324                         NULL, NULL);
325                 rc = l_wait_event(imp->imp_recovery_waitq,
326                                   (atomic_read(&imp->imp_inflight) == 0),
327                                   &lwi);
328                 if (rc) {
329                         const char *cli_tgt = obd2cli_tgt(imp->imp_obd);
330
331                         CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
332                                cli_tgt, rc, atomic_read(&imp->imp_inflight));
333
334                         spin_lock(&imp->imp_lock);
335                         if (atomic_read(&imp->imp_inflight) == 0) {
336                                 int count = atomic_read(&imp->imp_unregistering);
337
338                                 /* We know that "unregistering" rpcs only can
339                                  * survive in sending or delaying lists (they
340                                  * maybe waiting for long reply unlink in
341                                  * sluggish nets). Let's check this. If there
342                                  * is no inflight and unregistering != 0, this
343                                  * is bug. */
344                                 LASSERTF(count == 0, "Some RPCs are still "
345                                          "unregistering: %d\n", count);
346
347                                 /* Let's save one loop as soon as inflight have
348                                  * dropped to zero. No new inflights possible at
349                                  * this point. */
350                                 rc = 0;
351                         } else {
352                                 list_for_each_safe(tmp, n,
353                                                    &imp->imp_sending_list) {
354                                         req = list_entry(tmp,
355                                                          struct ptlrpc_request,
356                                                          rq_list);
357                                         DEBUG_REQ(D_ERROR, req,
358                                                   "still on sending list");
359                                 }
360                                 list_for_each_safe(tmp, n,
361                                                    &imp->imp_delayed_list) {
362                                         req = list_entry(tmp,
363                                                          struct ptlrpc_request,
364                                                          rq_list);
365                                         DEBUG_REQ(D_ERROR, req,
366                                                   "still on delayed list");
367                                 }
368
369                                 CERROR("%s: RPCs in \"%s\" phase found (%d). "
370                                        "Network is sluggish? Waiting them "
371                                        "to error out.\n", cli_tgt,
372                                        ptlrpc_phase2str(RQ_PHASE_UNREGISTERING),
373                                        atomic_read(&imp->imp_unregistering));
374                         }
375                         spin_unlock(&imp->imp_lock);
376                 }
377         } while (rc != 0);
378
379         /*
380          * Let's additionally check that no new rpcs added to import in
381          * "invalidate" state.
382          */
383         LASSERT(atomic_read(&imp->imp_inflight) == 0);
384         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
385         sptlrpc_import_flush_all_ctx(imp);
386
387         atomic_dec(&imp->imp_inval_count);
388         wake_up_all(&imp->imp_recovery_waitq);
389 }
390 EXPORT_SYMBOL(ptlrpc_invalidate_import);
391
392 /* unset imp_invalid */
393 void ptlrpc_activate_import(struct obd_import *imp)
394 {
395         struct obd_device *obd = imp->imp_obd;
396
397         spin_lock(&imp->imp_lock);
398         if (imp->imp_deactive != 0) {
399                 spin_unlock(&imp->imp_lock);
400                 return;
401         }
402
403         imp->imp_invalid = 0;
404         spin_unlock(&imp->imp_lock);
405         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
406 }
407 EXPORT_SYMBOL(ptlrpc_activate_import);
408
409 static void ptlrpc_pinger_force(struct obd_import *imp)
410 {
411         CDEBUG(D_HA, "%s: waking up pinger s:%s\n", obd2cli_tgt(imp->imp_obd),
412                ptlrpc_import_state_name(imp->imp_state));
413
414         spin_lock(&imp->imp_lock);
415         imp->imp_force_verify = 1;
416         spin_unlock(&imp->imp_lock);
417
418         if (imp->imp_state != LUSTRE_IMP_CONNECTING)
419                 ptlrpc_pinger_wake_up();
420 }
421
422 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
423 {
424         ENTRY;
425
426         LASSERT(!imp->imp_dlm_fake);
427
428         if (ptlrpc_set_import_discon(imp, conn_cnt)) {
429                 if (!imp->imp_replayable) {
430                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
431                                "auto-deactivating\n",
432                                obd2cli_tgt(imp->imp_obd),
433                                imp->imp_connection->c_remote_uuid.uuid,
434                                imp->imp_obd->obd_name);
435                         ptlrpc_deactivate_import(imp);
436                 }
437
438                 ptlrpc_pinger_force(imp);
439         }
440         EXIT;
441 }
442 EXPORT_SYMBOL(ptlrpc_fail_import);
443
444 int ptlrpc_reconnect_import(struct obd_import *imp)
445 {
446 #ifdef ENABLE_PINGER
447         struct l_wait_info lwi;
448         int secs = cfs_time_seconds(obd_timeout);
449         int rc;
450
451         ptlrpc_pinger_force(imp);
452
453         CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
454                obd2cli_tgt(imp->imp_obd), secs);
455
456         lwi = LWI_TIMEOUT(secs, NULL, NULL);
457         rc = l_wait_event(imp->imp_recovery_waitq,
458                           !ptlrpc_import_in_recovery(imp), &lwi);
459         CDEBUG(D_HA, "%s: recovery finished s:%s\n", obd2cli_tgt(imp->imp_obd),
460                ptlrpc_import_state_name(imp->imp_state));
461         return rc;
462 #else
463         ptlrpc_set_import_discon(imp, 0);
464         /* Force a new connect attempt */
465         ptlrpc_invalidate_import(imp);
466         /* Do a fresh connect next time by zeroing the handle */
467         ptlrpc_disconnect_import(imp, 1);
468         /* Wait for all invalidate calls to finish */
469         if (atomic_read(&imp->imp_inval_count) > 0) {
470                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
471                 int rc;
472
473                 rc = l_wait_event(imp->imp_recovery_waitq,
474                                   (atomic_read(&imp->imp_inval_count) == 0),
475                                   &lwi);
476                 if (rc)
477                         CERROR("Interrupted, inval=%d\n",
478                                atomic_read(&imp->imp_inval_count));
479         }
480
481         /* Allow reconnect attempts */
482         imp->imp_obd->obd_no_recov = 0;
483         /* Remove 'invalid' flag */
484         ptlrpc_activate_import(imp);
485         /* Attempt a new connect */
486         ptlrpc_recover_import(imp, NULL, 0);
487         return 0;
488 #endif
489 }
490 EXPORT_SYMBOL(ptlrpc_reconnect_import);
491
492 /**
493  * Connection on import \a imp is changed to another one (if more than one is
494  * present). We typically chose connection that we have not tried to connect to
495  * the longest
496  */
497 static int import_select_connection(struct obd_import *imp)
498 {
499         struct obd_import_conn *imp_conn = NULL, *conn;
500         struct obd_export *dlmexp;
501         char *target_start;
502         int target_len, tried_all = 1;
503         ENTRY;
504
505         spin_lock(&imp->imp_lock);
506
507         if (list_empty(&imp->imp_conn_list)) {
508                 CERROR("%s: no connections available\n",
509                        imp->imp_obd->obd_name);
510                 spin_unlock(&imp->imp_lock);
511                 RETURN(-EINVAL);
512         }
513
514         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
515                 CDEBUG(D_HA, "%s: connect to NID %s last attempt "LPU64"\n",
516                        imp->imp_obd->obd_name,
517                        libcfs_nid2str(conn->oic_conn->c_peer.nid),
518                        conn->oic_last_attempt);
519
520                 /* If we have not tried this connection since
521                    the last successful attempt, go with this one */
522                 if ((conn->oic_last_attempt == 0) ||
523                     cfs_time_beforeq_64(conn->oic_last_attempt,
524                                        imp->imp_last_success_conn)) {
525                         imp_conn = conn;
526                         tried_all = 0;
527                         break;
528                 }
529
530                 /* If all of the connections have already been tried
531                    since the last successful connection; just choose the
532                    least recently used */
533                 if (!imp_conn)
534                         imp_conn = conn;
535                 else if (cfs_time_before_64(conn->oic_last_attempt,
536                                             imp_conn->oic_last_attempt))
537                         imp_conn = conn;
538         }
539
540         /* if not found, simply choose the current one */
541         if (!imp_conn || imp->imp_force_reconnect) {
542                 LASSERT(imp->imp_conn_current);
543                 imp_conn = imp->imp_conn_current;
544                 tried_all = 0;
545         }
546         LASSERT(imp_conn->oic_conn);
547
548         /* If we've tried everything, and we're back to the beginning of the
549            list, increase our timeout and try again. It will be reset when
550            we do finally connect. (FIXME: really we should wait for all network
551            state associated with the last connection attempt to drain before
552            trying to reconnect on it.) */
553         if (tried_all && (imp->imp_conn_list.next == &imp_conn->oic_item)) {
554                 struct adaptive_timeout *at = &imp->imp_at.iat_net_latency;
555                 if (at_get(at) < CONNECTION_SWITCH_MAX) {
556                         at_measured(at, at_get(at) + CONNECTION_SWITCH_INC);
557                         if (at_get(at) > CONNECTION_SWITCH_MAX)
558                                 at_reset(at, CONNECTION_SWITCH_MAX);
559                 }
560                 LASSERT(imp_conn->oic_last_attempt);
561                 CDEBUG(D_HA, "%s: tried all connections, increasing latency "
562                         "to %ds\n", imp->imp_obd->obd_name, at_get(at));
563         }
564
565         imp_conn->oic_last_attempt = cfs_time_current_64();
566
567         /* switch connection, don't mind if it's same as the current one */
568         if (imp->imp_connection)
569                 ptlrpc_connection_put(imp->imp_connection);
570         imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
571
572         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
573         LASSERT(dlmexp != NULL);
574         if (dlmexp->exp_connection)
575                 ptlrpc_connection_put(dlmexp->exp_connection);
576         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
577         class_export_put(dlmexp);
578
579         if (imp->imp_conn_current != imp_conn) {
580                 if (imp->imp_conn_current) {
581                         deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
582                                   &target_start, &target_len);
583
584                         CDEBUG(D_HA, "%s: Connection changing to"
585                                " %.*s (at %s)\n",
586                                imp->imp_obd->obd_name,
587                                target_len, target_start,
588                                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
589                 }
590
591                 imp->imp_conn_current = imp_conn;
592         }
593
594         CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
595                imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
596                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
597
598         spin_unlock(&imp->imp_lock);
599
600         RETURN(0);
601 }
602
603 /*
604  * must be called under imp_lock
605  */
606 static int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
607 {
608         struct ptlrpc_request   *req;
609         struct list_head        *tmp;
610
611         /* The requests in committed_list always have smaller transnos than
612          * the requests in replay_list */
613         if (!list_empty(&imp->imp_committed_list)) {
614                 tmp = imp->imp_committed_list.next;
615                 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
616                 *transno = req->rq_transno;
617                 if (req->rq_transno == 0) {
618                         DEBUG_REQ(D_ERROR, req, "zero transno in committed_list");
619                         LBUG();
620                 }
621                 return 1;
622         }
623         if (!list_empty(&imp->imp_replay_list)) {
624                 tmp = imp->imp_replay_list.next;
625                 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
626                 *transno = req->rq_transno;
627                 if (req->rq_transno == 0) {
628                         DEBUG_REQ(D_ERROR, req, "zero transno in replay_list");
629                         LBUG();
630                 }
631                 return 1;
632         }
633         return 0;
634 }
635
636 /**
637  * Attempt to (re)connect import \a imp. This includes all preparations,
638  * initializing CONNECT RPC request and passing it to ptlrpcd for
639  * actual sending.
640  * Returns 0 on success or error code.
641  */
642 int ptlrpc_connect_import(struct obd_import *imp)
643 {
644         struct obd_device *obd = imp->imp_obd;
645         int initial_connect = 0;
646         int set_transno = 0;
647         __u64 committed_before_reconnect = 0;
648         struct ptlrpc_request *request;
649         char *bufs[] = { NULL,
650                          obd2cli_tgt(imp->imp_obd),
651                          obd->obd_uuid.uuid,
652                          (char *)&imp->imp_dlm_handle,
653                          (char *)&imp->imp_connect_data };
654         struct ptlrpc_connect_async_args *aa;
655         int rc;
656         ENTRY;
657
658         spin_lock(&imp->imp_lock);
659         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
660                 spin_unlock(&imp->imp_lock);
661                 CERROR("can't connect to a closed import\n");
662                 RETURN(-EINVAL);
663         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
664                 spin_unlock(&imp->imp_lock);
665                 CERROR("already connected\n");
666                 RETURN(0);
667         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
668                 spin_unlock(&imp->imp_lock);
669                 CERROR("already connecting\n");
670                 RETURN(-EALREADY);
671         }
672
673         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
674
675         imp->imp_conn_cnt++;
676         imp->imp_resend_replay = 0;
677
678         if (!lustre_handle_is_used(&imp->imp_remote_handle))
679                 initial_connect = 1;
680         else
681                 committed_before_reconnect = imp->imp_peer_committed_transno;
682
683         set_transno = ptlrpc_first_transno(imp,
684                                            &imp->imp_connect_data.ocd_transno);
685         spin_unlock(&imp->imp_lock);
686
687         rc = import_select_connection(imp);
688         if (rc)
689                 GOTO(out, rc);
690
691         rc = sptlrpc_import_sec_adapt(imp, NULL, 0);
692         if (rc)
693                 GOTO(out, rc);
694
695         /* Reset connect flags to the originally requested flags, in case
696          * the server is updated on-the-fly we will get the new features. */
697         imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
698         /* Reset ocd_version each time so the server knows the exact versions */
699         imp->imp_connect_data.ocd_version = LUSTRE_VERSION_CODE;
700         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
701         imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
702
703         rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
704                            &obd->obd_uuid, &imp->imp_connect_data, NULL);
705         if (rc)
706                 GOTO(out, rc);
707
708         request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
709         if (request == NULL)
710                 GOTO(out, rc = -ENOMEM);
711
712         rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
713                                       imp->imp_connect_op, bufs, NULL);
714         if (rc) {
715                 ptlrpc_request_free(request);
716                 GOTO(out, rc);
717         }
718
719         /* Report the rpc service time to the server so that it knows how long
720          * to wait for clients to join recovery */
721         lustre_msg_set_service_time(request->rq_reqmsg,
722                                     at_timeout2est(request->rq_timeout));
723
724         /* The amount of time we give the server to process the connect req.
725          * import_select_connection will increase the net latency on
726          * repeated reconnect attempts to cover slow networks.
727          * We override/ignore the server rpc completion estimate here,
728          * which may be large if this is a reconnect attempt */
729         request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
730         lustre_msg_set_timeout(request->rq_reqmsg, request->rq_timeout);
731
732         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
733
734         request->rq_no_resend = request->rq_no_delay = 1;
735         request->rq_send_state = LUSTRE_IMP_CONNECTING;
736         /* Allow a slightly larger reply for future growth compatibility */
737         req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
738                              sizeof(struct obd_connect_data)+16*sizeof(__u64));
739         ptlrpc_request_set_replen(request);
740         request->rq_interpret_reply = ptlrpc_connect_interpret;
741
742         CLASSERT(sizeof (*aa) <= sizeof (request->rq_async_args));
743         aa = ptlrpc_req_async_args(request);
744         memset(aa, 0, sizeof *aa);
745
746         aa->pcaa_peer_committed = committed_before_reconnect;
747         aa->pcaa_initial_connect = initial_connect;
748
749         if (aa->pcaa_initial_connect) {
750                 spin_lock(&imp->imp_lock);
751                 imp->imp_replayable = 1;
752                 spin_unlock(&imp->imp_lock);
753                 lustre_msg_add_op_flags(request->rq_reqmsg,
754                                         MSG_CONNECT_INITIAL);
755         }
756
757         if (set_transno)
758                 lustre_msg_add_op_flags(request->rq_reqmsg,
759                                         MSG_CONNECT_TRANSNO);
760
761         DEBUG_REQ(D_RPCTRACE, request, "(re)connect request (timeout %d)",
762                   request->rq_timeout);
763         ptlrpcd_add_req(request, PDL_POLICY_ROUND, -1);
764         rc = 0;
765 out:
766         if (rc != 0) {
767                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
768         }
769
770         RETURN(rc);
771 }
772 EXPORT_SYMBOL(ptlrpc_connect_import);
773
774 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
775 {
776         int force_verify;
777
778         spin_lock(&imp->imp_lock);
779         force_verify = imp->imp_force_verify != 0;
780         spin_unlock(&imp->imp_lock);
781
782         if (force_verify)
783                 ptlrpc_pinger_wake_up();
784 }
785
786 static int ptlrpc_busy_reconnect(int rc)
787 {
788         return (rc == -EBUSY) || (rc == -EAGAIN);
789 }
790
791 /**
792  * interpret_reply callback for connect RPCs.
793  * Looks into returned status of connect operation and decides
794  * what to do with the import - i.e enter recovery, promote it to
795  * full state for normal operations of disconnect it due to an error.
796  */
797 static int ptlrpc_connect_interpret(const struct lu_env *env,
798                                     struct ptlrpc_request *request,
799                                     void *data, int rc)
800 {
801         struct ptlrpc_connect_async_args *aa = data;
802         struct obd_import *imp = request->rq_import;
803         struct client_obd *cli = &imp->imp_obd->u.cli;
804         struct lustre_handle old_hdl;
805         __u64 old_connect_flags;
806         int msg_flags;
807         struct obd_connect_data *ocd;
808         struct obd_export *exp;
809         int ret;
810         ENTRY;
811
812         spin_lock(&imp->imp_lock);
813         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
814                 imp->imp_connect_tried = 1;
815                 spin_unlock(&imp->imp_lock);
816                 RETURN(0);
817         }
818
819         if (rc) {
820                 /* if this reconnect to busy export - not need select new target
821                  * for connecting*/
822                 imp->imp_force_reconnect = ptlrpc_busy_reconnect(rc);
823                 spin_unlock(&imp->imp_lock);
824                 ptlrpc_maybe_ping_import_soon(imp);
825                 GOTO(out, rc);
826         }
827         spin_unlock(&imp->imp_lock);
828
829         LASSERT(imp->imp_conn_current);
830
831         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
832
833         ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
834                                    RCL_SERVER);
835         /* server replied obd_connect_data is always bigger */
836         ocd = req_capsule_server_sized_get(&request->rq_pill,
837                                            &RMF_CONNECT_DATA, ret);
838
839         if (ocd == NULL) {
840                 CERROR("%s: no connect data from server\n",
841                        imp->imp_obd->obd_name);
842                 rc = -EPROTO;
843                 GOTO(out, rc);
844         }
845
846         spin_lock(&imp->imp_lock);
847
848         /* All imports are pingable */
849         imp->imp_pingable = 1;
850         imp->imp_force_reconnect = 0;
851         imp->imp_force_verify = 0;
852
853         imp->imp_connect_data = *ocd;
854
855         CDEBUG(D_HA, "%s: connect to target with instance %u\n",
856                imp->imp_obd->obd_name, ocd->ocd_instance);
857         exp = class_conn2export(&imp->imp_dlm_handle);
858
859         spin_unlock(&imp->imp_lock);
860
861         /* check that server granted subset of flags we asked for. */
862         if ((ocd->ocd_connect_flags & imp->imp_connect_flags_orig) !=
863             ocd->ocd_connect_flags) {
864                 CERROR("%s: Server didn't granted asked subset of flags: "
865                        "asked="LPX64" grranted="LPX64"\n",
866                        imp->imp_obd->obd_name,imp->imp_connect_flags_orig,
867                        ocd->ocd_connect_flags);
868                 GOTO(out, rc = -EPROTO);
869         }
870
871         if (!exp) {
872                 /* This could happen if export is cleaned during the
873                    connect attempt */
874                 CERROR("%s: missing export after connect\n",
875                        imp->imp_obd->obd_name);
876                 GOTO(out, rc = -ENODEV);
877         }
878         old_connect_flags = exp_connect_flags(exp);
879         exp->exp_connect_data = *ocd;
880         imp->imp_obd->obd_self_export->exp_connect_data = *ocd;
881         class_export_put(exp);
882
883         /* The net statistics after (re-)connect is not valid anymore,
884          * because may reflect other routing, etc. */
885         at_init(&imp->imp_at.iat_net_latency, 0, 0);
886         ptlrpc_at_adj_net_latency(request,
887                         lustre_msg_get_service_time(request->rq_repmsg));
888
889         obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
890
891         if (aa->pcaa_initial_connect) {
892                 spin_lock(&imp->imp_lock);
893                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
894                         imp->imp_replayable = 1;
895                         spin_unlock(&imp->imp_lock);
896                         CDEBUG(D_HA, "connected to replayable target: %s\n",
897                                obd2cli_tgt(imp->imp_obd));
898                 } else {
899                         imp->imp_replayable = 0;
900                         spin_unlock(&imp->imp_lock);
901                 }
902
903                 /* if applies, adjust the imp->imp_msg_magic here
904                  * according to reply flags */
905
906                 imp->imp_remote_handle =
907                                 *lustre_msg_get_handle(request->rq_repmsg);
908
909                 /* Initial connects are allowed for clients with non-random
910                  * uuids when servers are in recovery.  Simply signal the
911                  * servers replay is complete and wait in REPLAY_WAIT. */
912                 if (msg_flags & MSG_CONNECT_RECOVERING) {
913                         CDEBUG(D_HA, "connect to %s during recovery\n",
914                                obd2cli_tgt(imp->imp_obd));
915                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
916                 } else {
917                         IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
918                         ptlrpc_activate_import(imp);
919                 }
920
921                 GOTO(finish, rc = 0);
922         }
923
924         /* Determine what recovery state to move the import to. */
925         if (MSG_CONNECT_RECONNECT & msg_flags) {
926                 memset(&old_hdl, 0, sizeof(old_hdl));
927                 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
928                             sizeof (old_hdl))) {
929                         LCONSOLE_WARN("Reconnect to %s (at @%s) failed due "
930                                       "bad handle "LPX64"\n",
931                                       obd2cli_tgt(imp->imp_obd),
932                                       imp->imp_connection->c_remote_uuid.uuid,
933                                       imp->imp_dlm_handle.cookie);
934                         GOTO(out, rc = -ENOTCONN);
935                 }
936
937                 if (memcmp(&imp->imp_remote_handle,
938                            lustre_msg_get_handle(request->rq_repmsg),
939                            sizeof(imp->imp_remote_handle))) {
940                         int level = msg_flags & MSG_CONNECT_RECOVERING ?
941                                 D_HA : D_WARNING;
942
943                         /* Bug 16611/14775: if server handle have changed,
944                          * that means some sort of disconnection happened.
945                          * If the server is not in recovery, that also means it
946                          * already erased all of our state because of previous
947                          * eviction. If it is in recovery - we are safe to
948                          * participate since we can reestablish all of our state
949                          * with server again */
950                         if ((MSG_CONNECT_RECOVERING & msg_flags)) {
951                                 CDEBUG(level,"%s@%s changed server handle from "
952                                        LPX64" to "LPX64
953                                        " but is still in recovery\n",
954                                        obd2cli_tgt(imp->imp_obd),
955                                        imp->imp_connection->c_remote_uuid.uuid,
956                                        imp->imp_remote_handle.cookie,
957                                        lustre_msg_get_handle(
958                                        request->rq_repmsg)->cookie);
959                         } else {
960                                 LCONSOLE_WARN("Evicted from %s (at %s) "
961                                               "after server handle changed from "
962                                               LPX64" to "LPX64"\n",
963                                               obd2cli_tgt(imp->imp_obd),
964                                               imp->imp_connection-> \
965                                               c_remote_uuid.uuid,
966                                               imp->imp_remote_handle.cookie,
967                                               lustre_msg_get_handle(
968                                               request->rq_repmsg)->cookie);
969                         }
970
971
972                         imp->imp_remote_handle =
973                                      *lustre_msg_get_handle(request->rq_repmsg);
974
975                         if (!(MSG_CONNECT_RECOVERING & msg_flags)) {
976                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
977                                 GOTO(finish, rc = 0);
978                         }
979
980                 } else {
981                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
982                                obd2cli_tgt(imp->imp_obd),
983                                imp->imp_connection->c_remote_uuid.uuid);
984                 }
985
986                 if (imp->imp_invalid) {
987                         CDEBUG(D_HA, "%s: reconnected but import is invalid; "
988                                "marking evicted\n", imp->imp_obd->obd_name);
989                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
990                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
991                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
992                                imp->imp_obd->obd_name,
993                                obd2cli_tgt(imp->imp_obd));
994
995                         spin_lock(&imp->imp_lock);
996                         imp->imp_resend_replay = 1;
997                         spin_unlock(&imp->imp_lock);
998
999                         IMPORT_SET_STATE(imp, imp->imp_replay_state);
1000                 } else {
1001                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1002                 }
1003         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
1004                 LASSERT(imp->imp_replayable);
1005                 imp->imp_remote_handle =
1006                                 *lustre_msg_get_handle(request->rq_repmsg);
1007                 imp->imp_last_replay_transno = 0;
1008                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
1009         } else {
1010                 DEBUG_REQ(D_HA, request, "%s: evicting (reconnect/recover flags"
1011                           " not set: %x)", imp->imp_obd->obd_name, msg_flags);
1012                 imp->imp_remote_handle =
1013                                 *lustre_msg_get_handle(request->rq_repmsg);
1014                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
1015         }
1016
1017         /* Sanity checks for a reconnected import. */
1018         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
1019                 CERROR("imp_replayable flag does not match server "
1020                        "after reconnect. We should LBUG right here.\n");
1021         }
1022
1023         if (lustre_msg_get_last_committed(request->rq_repmsg) > 0 &&
1024             lustre_msg_get_last_committed(request->rq_repmsg) <
1025             aa->pcaa_peer_committed) {
1026                 CERROR("%s went back in time (transno "LPD64
1027                        " was previously committed, server now claims "LPD64
1028                        ")!  See https://bugzilla.lustre.org/show_bug.cgi?"
1029                        "id=9646\n",
1030                        obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
1031                        lustre_msg_get_last_committed(request->rq_repmsg));
1032         }
1033
1034 finish:
1035         rc = ptlrpc_import_recovery_state_machine(imp);
1036         if (rc != 0) {
1037                 if (rc == -ENOTCONN) {
1038                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
1039                                "invalidating and reconnecting\n",
1040                                obd2cli_tgt(imp->imp_obd),
1041                                imp->imp_connection->c_remote_uuid.uuid);
1042                         ptlrpc_connect_import(imp);
1043                         imp->imp_connect_tried = 1;
1044                         RETURN(0);
1045                 }
1046         } else {
1047                 static bool warned;
1048
1049                 spin_lock(&imp->imp_lock);
1050                 list_del(&imp->imp_conn_current->oic_item);
1051                 list_add(&imp->imp_conn_current->oic_item,
1052                              &imp->imp_conn_list);
1053                 imp->imp_last_success_conn =
1054                         imp->imp_conn_current->oic_last_attempt;
1055
1056                 spin_unlock(&imp->imp_lock);
1057
1058                 if ((imp->imp_connect_flags_orig & OBD_CONNECT_IBITS) &&
1059                     !(ocd->ocd_connect_flags & OBD_CONNECT_IBITS)) {
1060                         LCONSOLE_WARN("%s: MDS %s does not support ibits "
1061                                       "lock, either very old or invalid: "
1062                                       "requested "LPX64", replied "LPX64"\n",
1063                                       imp->imp_obd->obd_name,
1064                                       imp->imp_connection->c_remote_uuid.uuid,
1065                                       imp->imp_connect_flags_orig,
1066                                       ocd->ocd_connect_flags);
1067                         GOTO(out, rc = -EPROTO);
1068                 }
1069
1070                 if (!warned && (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1071                     (ocd->ocd_version > LUSTRE_VERSION_CODE +
1072                                         LUSTRE_VERSION_OFFSET_WARN ||
1073                      ocd->ocd_version < LUSTRE_VERSION_CODE -
1074                                         LUSTRE_VERSION_OFFSET_WARN)) {
1075                         /* Sigh, some compilers do not like #ifdef in the middle
1076                            of macro arguments */
1077                         const char *older = "older than client. "
1078                                             "Consider upgrading server";
1079                         const char *newer = "newer than client. "
1080                                             "Consider recompiling application";
1081
1082                         LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
1083                                       "is much %s (%s)\n",
1084                                       obd2cli_tgt(imp->imp_obd),
1085                                       OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1086                                       OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1087                                       OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1088                                       OBD_OCD_VERSION_FIX(ocd->ocd_version),
1089                                       ocd->ocd_version > LUSTRE_VERSION_CODE ?
1090                                       newer : older, LUSTRE_VERSION_STRING);
1091                         warned = true;
1092                 }
1093
1094 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1095                 /* Check if server has LU-1252 fix applied to not always swab
1096                  * the IR MNE entries. Do this only once per connection.  This
1097                  * fixup is version-limited, because we don't want to carry the
1098                  * OBD_CONNECT_MNE_SWAB flag around forever, just so long as we
1099                  * need interop with unpatched 2.2 servers.  For newer servers,
1100                  * the client will do MNE swabbing only as needed.  LU-1644 */
1101                 if (unlikely((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1102                              !(ocd->ocd_connect_flags & OBD_CONNECT_MNE_SWAB) &&
1103                              OBD_OCD_VERSION_MAJOR(ocd->ocd_version) == 2 &&
1104                              OBD_OCD_VERSION_MINOR(ocd->ocd_version) == 2 &&
1105                              OBD_OCD_VERSION_PATCH(ocd->ocd_version) < 55 &&
1106                              strcmp(imp->imp_obd->obd_type->typ_name,
1107                                     LUSTRE_MGC_NAME) == 0))
1108                         imp->imp_need_mne_swab = 1;
1109                 else /* clear if server was upgraded since last connect */
1110                         imp->imp_need_mne_swab = 0;
1111 #endif
1112
1113                 if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
1114                         /* We sent to the server ocd_cksum_types with bits set
1115                          * for algorithms we understand. The server masked off
1116                          * the checksum types it doesn't support */
1117                         if ((ocd->ocd_cksum_types &
1118                              cksum_types_supported_client()) == 0) {
1119                                 LCONSOLE_WARN("The negotiation of the checksum "
1120                                               "alogrithm to use with server %s "
1121                                               "failed (%x/%x), disabling "
1122                                               "checksums\n",
1123                                               obd2cli_tgt(imp->imp_obd),
1124                                               ocd->ocd_cksum_types,
1125                                               cksum_types_supported_client());
1126                                 cli->cl_checksum = 0;
1127                                 cli->cl_supp_cksum_types = OBD_CKSUM_ADLER;
1128                         } else {
1129                                 cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
1130                         }
1131                 } else {
1132                         /* The server does not support OBD_CONNECT_CKSUM.
1133                          * Enforce ADLER for backward compatibility*/
1134                         cli->cl_supp_cksum_types = OBD_CKSUM_ADLER;
1135                 }
1136                 cli->cl_cksum_type =cksum_type_select(cli->cl_supp_cksum_types);
1137
1138                 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE)
1139                         cli->cl_max_pages_per_rpc =
1140                                 min(ocd->ocd_brw_size >> PAGE_CACHE_SHIFT,
1141                                     cli->cl_max_pages_per_rpc);
1142                 else if (imp->imp_connect_op == MDS_CONNECT ||
1143                          imp->imp_connect_op == MGS_CONNECT)
1144                         cli->cl_max_pages_per_rpc = 1;
1145
1146                 /* Reset ns_connect_flags only for initial connect. It might be
1147                  * changed in while using FS and if we reset it in reconnect
1148                  * this leads to losing user settings done before such as
1149                  * disable lru_resize, etc. */
1150                 if (old_connect_flags != exp_connect_flags(exp) ||
1151                     aa->pcaa_initial_connect) {
1152                         CDEBUG(D_HA, "%s: Resetting ns_connect_flags to server "
1153                                "flags: "LPX64"\n", imp->imp_obd->obd_name,
1154                               ocd->ocd_connect_flags);
1155                         imp->imp_obd->obd_namespace->ns_connect_flags =
1156                                 ocd->ocd_connect_flags;
1157                         imp->imp_obd->obd_namespace->ns_orig_connect_flags =
1158                                 ocd->ocd_connect_flags;
1159                 }
1160
1161                 if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
1162                     (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1163                         /* We need a per-message support flag, because
1164                            a. we don't know if the incoming connect reply
1165                               supports AT or not (in reply_in_callback)
1166                               until we unpack it.
1167                            b. failovered server means export and flags are gone
1168                               (in ptlrpc_send_reply).
1169                            Can only be set when we know AT is supported at
1170                            both ends */
1171                         imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1172                 else
1173                         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1174
1175                 if ((ocd->ocd_connect_flags & OBD_CONNECT_FULL20) &&
1176                     (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1177                         imp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1178                 else
1179                         imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1180
1181                 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
1182                         (cli->cl_max_pages_per_rpc > 0));
1183                 client_adjust_max_dirty(cli);
1184         }
1185
1186 out:
1187         imp->imp_connect_tried = 1;
1188
1189         if (rc != 0) {
1190                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
1191                 if (rc == -EACCES) {
1192                         /*
1193                          * Give up trying to reconnect
1194                          * EACCES means client has no permission for connection
1195                          */
1196                         imp->imp_obd->obd_no_recov = 1;
1197                         ptlrpc_deactivate_import(imp);
1198                 }
1199
1200                 if (rc == -EPROTO) {
1201                         struct obd_connect_data *ocd;
1202
1203                         /* reply message might not be ready */
1204                         if (request->rq_repmsg == NULL)
1205                                 RETURN(-EPROTO);
1206
1207                         ocd = req_capsule_server_get(&request->rq_pill,
1208                                                      &RMF_CONNECT_DATA);
1209                         if (ocd &&
1210                             (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1211                             (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
1212                            /* Actually servers are only supposed to refuse
1213                               connection from liblustre clients, so we should
1214                               never see this from VFS context */
1215                                 LCONSOLE_ERROR_MSG(0x16a, "Server %s version "
1216                                         "(%d.%d.%d.%d)"
1217                                         " refused connection from this client "
1218                                         "with an incompatible version (%s).  "
1219                                         "Client must be recompiled\n",
1220                                         obd2cli_tgt(imp->imp_obd),
1221                                         OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1222                                         OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1223                                         OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1224                                         OBD_OCD_VERSION_FIX(ocd->ocd_version),
1225                                         LUSTRE_VERSION_STRING);
1226                                 ptlrpc_deactivate_import(imp);
1227                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
1228                         }
1229                         RETURN(-EPROTO);
1230                 }
1231
1232                 ptlrpc_maybe_ping_import_soon(imp);
1233
1234                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
1235                        obd2cli_tgt(imp->imp_obd),
1236                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
1237         }
1238
1239         wake_up_all(&imp->imp_recovery_waitq);
1240         RETURN(rc);
1241 }
1242
1243 /**
1244  * interpret callback for "completed replay" RPCs.
1245  * \see signal_completed_replay
1246  */
1247 static int completed_replay_interpret(const struct lu_env *env,
1248                                       struct ptlrpc_request *req,
1249                                       void * data, int rc)
1250 {
1251         ENTRY;
1252         atomic_dec(&req->rq_import->imp_replay_inflight);
1253         if (req->rq_status == 0 &&
1254             !req->rq_import->imp_vbr_failed) {
1255                 ptlrpc_import_recovery_state_machine(req->rq_import);
1256         } else {
1257                 if (req->rq_import->imp_vbr_failed) {
1258                         CDEBUG(D_WARNING,
1259                                "%s: version recovery fails, reconnecting\n",
1260                                req->rq_import->imp_obd->obd_name);
1261                 } else {
1262                         CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
1263                                      "reconnecting\n",
1264                                req->rq_import->imp_obd->obd_name,
1265                                req->rq_status);
1266                 }
1267                 ptlrpc_connect_import(req->rq_import);
1268         }
1269
1270         RETURN(0);
1271 }
1272
1273 /**
1274  * Let server know that we have no requests to replay anymore.
1275  * Achieved by just sending a PING request
1276  */
1277 static int signal_completed_replay(struct obd_import *imp)
1278 {
1279         struct ptlrpc_request *req;
1280         ENTRY;
1281
1282         if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_FINISH_REPLAY)))
1283                 RETURN(0);
1284
1285         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1286         atomic_inc(&imp->imp_replay_inflight);
1287
1288         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
1289                                         OBD_PING);
1290         if (req == NULL) {
1291                 atomic_dec(&imp->imp_replay_inflight);
1292                 RETURN(-ENOMEM);
1293         }
1294
1295         ptlrpc_request_set_replen(req);
1296         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
1297         lustre_msg_add_flags(req->rq_reqmsg,
1298                              MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
1299         if (AT_OFF)
1300                 req->rq_timeout *= 3;
1301         req->rq_interpret_reply = completed_replay_interpret;
1302
1303         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
1304         RETURN(0);
1305 }
1306
1307 /**
1308  * In kernel code all import invalidation happens in its own
1309  * separate thread, so that whatever application happened to encounter
1310  * a problem could still be killed or otherwise continue
1311  */
1312 static int ptlrpc_invalidate_import_thread(void *data)
1313 {
1314         struct obd_import *imp = data;
1315
1316         ENTRY;
1317
1318         unshare_fs_struct();
1319
1320         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
1321                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1322                imp->imp_connection->c_remote_uuid.uuid);
1323
1324         ptlrpc_invalidate_import(imp);
1325
1326         if (obd_dump_on_eviction) {
1327                 CERROR("dump the log upon eviction\n");
1328                 libcfs_debug_dumplog();
1329         }
1330
1331         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1332         ptlrpc_import_recovery_state_machine(imp);
1333
1334         class_import_put(imp);
1335         RETURN(0);
1336 }
1337
1338 /**
1339  * This is the state machine for client-side recovery on import.
1340  *
1341  * Typicaly we have two possibly paths. If we came to server and it is not
1342  * in recovery, we just enter IMP_EVICTED state, invalidate our import
1343  * state and reconnect from scratch.
1344  * If we came to server that is in recovery, we enter IMP_REPLAY import state.
1345  * We go through our list of requests to replay and send them to server one by
1346  * one.
1347  * After sending all request from the list we change import state to
1348  * IMP_REPLAY_LOCKS and re-request all the locks we believe we have from server
1349  * and also all the locks we don't yet have and wait for server to grant us.
1350  * After that we send a special "replay completed" request and change import
1351  * state to IMP_REPLAY_WAIT.
1352  * Upon receiving reply to that "replay completed" RPC we enter IMP_RECOVER
1353  * state and resend all requests from sending list.
1354  * After that we promote import to FULL state and send all delayed requests
1355  * and import is fully operational after that.
1356  *
1357  */
1358 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
1359 {
1360         int rc = 0;
1361         int inflight;
1362         char *target_start;
1363         int target_len;
1364
1365         ENTRY;
1366         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
1367                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1368                           &target_start, &target_len);
1369                 /* Don't care about MGC eviction */
1370                 if (strcmp(imp->imp_obd->obd_type->typ_name,
1371                            LUSTRE_MGC_NAME) != 0) {
1372                         LCONSOLE_ERROR_MSG(0x167, "%s: This client was evicted "
1373                                            "by %.*s; in progress operations "
1374                                            "using this service will fail.\n",
1375                                            imp->imp_obd->obd_name, target_len,
1376                                            target_start);
1377                 }
1378                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
1379                        obd2cli_tgt(imp->imp_obd),
1380                        imp->imp_connection->c_remote_uuid.uuid);
1381                 /* reset vbr_failed flag upon eviction */
1382                 spin_lock(&imp->imp_lock);
1383                 imp->imp_vbr_failed = 0;
1384                 spin_unlock(&imp->imp_lock);
1385
1386                 {
1387                 struct task_struct *task;
1388                 /* bug 17802:  XXX client_disconnect_export vs connect request
1389                  * race. if client will evicted at this time, we start
1390                  * invalidate thread without reference to import and import can
1391                  * be freed at same time. */
1392                 class_import_get(imp);
1393                 task = kthread_run(ptlrpc_invalidate_import_thread, imp,
1394                                      "ll_imp_inval");
1395                 if (IS_ERR(task)) {
1396                         class_import_put(imp);
1397                         CERROR("error starting invalidate thread: %d\n", rc);
1398                         rc = PTR_ERR(task);
1399                 } else {
1400                         rc = 0;
1401                 }
1402                 RETURN(rc);
1403                 }
1404         }
1405
1406         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
1407                 CDEBUG(D_HA, "replay requested by %s\n",
1408                        obd2cli_tgt(imp->imp_obd));
1409                 rc = ptlrpc_replay_next(imp, &inflight);
1410                 if (inflight == 0 &&
1411                     atomic_read(&imp->imp_replay_inflight) == 0) {
1412                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
1413                         rc = ldlm_replay_locks(imp);
1414                         if (rc)
1415                                 GOTO(out, rc);
1416                 }
1417                 rc = 0;
1418         }
1419
1420         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
1421                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1422                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
1423                         rc = signal_completed_replay(imp);
1424                         if (rc)
1425                                 GOTO(out, rc);
1426                 }
1427         }
1428
1429         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
1430                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1431                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1432                 }
1433         }
1434
1435         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
1436                 CDEBUG(D_HA, "reconnected to %s@%s\n",
1437                        obd2cli_tgt(imp->imp_obd),
1438                        imp->imp_connection->c_remote_uuid.uuid);
1439
1440                 rc = ptlrpc_resend(imp);
1441                 if (rc)
1442                         GOTO(out, rc);
1443                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
1444                 ptlrpc_activate_import(imp);
1445
1446                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1447                           &target_start, &target_len);
1448                 LCONSOLE_INFO("%s: Connection restored to %.*s (at %s)\n",
1449                               imp->imp_obd->obd_name,
1450                               target_len, target_start,
1451                               libcfs_nid2str(imp->imp_connection->c_peer.nid));
1452         }
1453
1454         if (imp->imp_state == LUSTRE_IMP_FULL) {
1455                 wake_up_all(&imp->imp_recovery_waitq);
1456                 ptlrpc_wake_delayed(imp);
1457         }
1458
1459 out:
1460         RETURN(rc);
1461 }
1462
1463 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1464 {
1465         struct ptlrpc_request *req;
1466         int rq_opc, rc = 0;
1467         ENTRY;
1468
1469         if (imp->imp_obd->obd_force)
1470                 GOTO(set_state, rc);
1471
1472         switch (imp->imp_connect_op) {
1473         case OST_CONNECT:
1474                 rq_opc = OST_DISCONNECT;
1475                 break;
1476         case MDS_CONNECT:
1477                 rq_opc = MDS_DISCONNECT;
1478                 break;
1479         case MGS_CONNECT:
1480                 rq_opc = MGS_DISCONNECT;
1481                 break;
1482         default:
1483                 rc = -EINVAL;
1484                 CERROR("%s: don't know how to disconnect from %s "
1485                        "(connect_op %d): rc = %d\n",
1486                        imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1487                        imp->imp_connect_op, rc);
1488                 RETURN(rc);
1489         }
1490
1491         if (ptlrpc_import_in_recovery(imp)) {
1492                 struct l_wait_info lwi;
1493                 cfs_duration_t timeout;
1494
1495                 if (AT_OFF) {
1496                         if (imp->imp_server_timeout)
1497                                 timeout = cfs_time_seconds(obd_timeout / 2);
1498                         else
1499                                 timeout = cfs_time_seconds(obd_timeout);
1500                 } else {
1501                         int idx = import_at_get_index(imp,
1502                                 imp->imp_client->cli_request_portal);
1503                         timeout = cfs_time_seconds(
1504                                 at_get(&imp->imp_at.iat_service_estimate[idx]));
1505                 }
1506
1507                 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1508                                        back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1509                 rc = l_wait_event(imp->imp_recovery_waitq,
1510                                   !ptlrpc_import_in_recovery(imp), &lwi);
1511
1512         }
1513
1514         spin_lock(&imp->imp_lock);
1515         if (imp->imp_state != LUSTRE_IMP_FULL)
1516                 GOTO(out, rc);
1517         spin_unlock(&imp->imp_lock);
1518
1519         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
1520                                         LUSTRE_OBD_VERSION, rq_opc);
1521         if (req) {
1522                 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1523                  * it fails.  We can get through the above with a down server
1524                  * if the client doesn't know the server is gone yet. */
1525                 req->rq_no_resend = 1;
1526
1527                 /* We want client umounts to happen quickly, no matter the
1528                    server state... */
1529                 req->rq_timeout = min_t(int, req->rq_timeout,
1530                                         INITIAL_CONNECT_TIMEOUT);
1531
1532                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1533                 req->rq_send_state =  LUSTRE_IMP_CONNECTING;
1534                 ptlrpc_request_set_replen(req);
1535                 rc = ptlrpc_queue_wait(req);
1536                 ptlrpc_req_finished(req);
1537         }
1538
1539 set_state:
1540         spin_lock(&imp->imp_lock);
1541 out:
1542         if (noclose)
1543                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1544         else
1545                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1546         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1547         spin_unlock(&imp->imp_lock);
1548
1549         if (rc == -ETIMEDOUT || rc == -ENOTCONN || rc == -ESHUTDOWN)
1550                 rc = 0;
1551         RETURN(rc);
1552 }
1553 EXPORT_SYMBOL(ptlrpc_disconnect_import);
1554
1555 void ptlrpc_cleanup_imp(struct obd_import *imp)
1556 {
1557         ENTRY;
1558
1559         spin_lock(&imp->imp_lock);
1560         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1561         imp->imp_generation++;
1562         spin_unlock(&imp->imp_lock);
1563         ptlrpc_abort_inflight(imp);
1564
1565         EXIT;
1566 }
1567 EXPORT_SYMBOL(ptlrpc_cleanup_imp);
1568
1569 /* Adaptive Timeout utils */
1570 extern unsigned int at_min, at_max, at_history;
1571
1572 /* Update at_current with the specified value (bounded by at_min and at_max),
1573  * as well as the AT history "bins".
1574  *  - Bin into timeslices using AT_BINS bins.
1575  *  - This gives us a max of the last at_history seconds without the storage,
1576  *    but still smoothing out a return to normalcy from a slow response.
1577  *  - (E.g. remember the maximum latency in each minute of the last 4 minutes.)
1578  */
1579 int at_measured(struct adaptive_timeout *at, unsigned int val)
1580 {
1581         unsigned int old = at->at_current;
1582         time_t now = cfs_time_current_sec();
1583         time_t binlimit = max_t(time_t, at_history / AT_BINS, 1);
1584
1585         LASSERT(at);
1586         CDEBUG(D_OTHER, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
1587                val, at, now - at->at_binstart, at->at_current,
1588                at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
1589
1590         if (val == 0)
1591                 /* 0's don't count, because we never want our timeout to
1592                    drop to 0, and because 0 could mean an error */
1593                 return 0;
1594
1595         spin_lock(&at->at_lock);
1596
1597         if (unlikely(at->at_binstart == 0)) {
1598                 /* Special case to remove default from history */
1599                 at->at_current = val;
1600                 at->at_worst_ever = val;
1601                 at->at_worst_time = now;
1602                 at->at_hist[0] = val;
1603                 at->at_binstart = now;
1604         } else if (now - at->at_binstart < binlimit ) {
1605                 /* in bin 0 */
1606                 at->at_hist[0] = max(val, at->at_hist[0]);
1607                 at->at_current = max(val, at->at_current);
1608         } else {
1609                 int i, shift;
1610                 unsigned int maxv = val;
1611                 /* move bins over */
1612                 shift = (now - at->at_binstart) / binlimit;
1613                 LASSERT(shift > 0);
1614                 for(i = AT_BINS - 1; i >= 0; i--) {
1615                         if (i >= shift) {
1616                                 at->at_hist[i] = at->at_hist[i - shift];
1617                                 maxv = max(maxv, at->at_hist[i]);
1618                         } else {
1619                                 at->at_hist[i] = 0;
1620                         }
1621                 }
1622                 at->at_hist[0] = val;
1623                 at->at_current = maxv;
1624                 at->at_binstart += shift * binlimit;
1625         }
1626
1627         if (at->at_current > at->at_worst_ever) {
1628                 at->at_worst_ever = at->at_current;
1629                 at->at_worst_time = now;
1630         }
1631
1632         if (at->at_flags & AT_FLG_NOHIST)
1633                 /* Only keep last reported val; keeping the rest of the history
1634                    for proc only */
1635                 at->at_current = val;
1636
1637         if (at_max > 0)
1638                 at->at_current =  min(at->at_current, at_max);
1639         at->at_current =  max(at->at_current, at_min);
1640
1641         if (at->at_current != old)
1642                 CDEBUG(D_OTHER, "AT %p change: old=%u new=%u delta=%d "
1643                        "(val=%u) hist %u %u %u %u\n", at,
1644                        old, at->at_current, at->at_current - old, val,
1645                        at->at_hist[0], at->at_hist[1], at->at_hist[2],
1646                        at->at_hist[3]);
1647
1648         /* if we changed, report the old value */
1649         old = (at->at_current != old) ? old : 0;
1650
1651         spin_unlock(&at->at_lock);
1652         return old;
1653 }
1654
1655 /* Find the imp_at index for a given portal; assign if space available */
1656 int import_at_get_index(struct obd_import *imp, int portal)
1657 {
1658         struct imp_at *at = &imp->imp_at;
1659         int i;
1660
1661         for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1662                 if (at->iat_portal[i] == portal)
1663                         return i;
1664                 if (at->iat_portal[i] == 0)
1665                         /* unused */
1666                         break;
1667         }
1668
1669         /* Not found in list, add it under a lock */
1670         spin_lock(&imp->imp_lock);
1671
1672         /* Check unused under lock */
1673         for (; i < IMP_AT_MAX_PORTALS; i++) {
1674                 if (at->iat_portal[i] == portal)
1675                         goto out;
1676                 if (at->iat_portal[i] == 0)
1677                         /* unused */
1678                         break;
1679         }
1680
1681         /* Not enough portals? */
1682         LASSERT(i < IMP_AT_MAX_PORTALS);
1683
1684         at->iat_portal[i] = portal;
1685 out:
1686         spin_unlock(&imp->imp_lock);
1687         return i;
1688 }