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