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drbd: fixup after wait_even_lock_irq() addition to generic code
[deliverable/linux.git] / drivers / block / drbd / drbd_state.c
1 /*
2 drbd_state.c
3
4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
5
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
9
10 Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev
11 from Logicworks, Inc. for making SDP replication support possible.
12
13 drbd is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2, or (at your option)
16 any later version.
17
18 drbd is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
22
23 You should have received a copy of the GNU General Public License
24 along with drbd; see the file COPYING. If not, write to
25 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28 #include <linux/drbd_limits.h>
29 #include "drbd_int.h"
30 #include "drbd_req.h"
31
32 /* in drbd_main.c */
33 extern void tl_abort_disk_io(struct drbd_conf *mdev);
34
35 struct after_state_chg_work {
36 struct drbd_work w;
37 union drbd_state os;
38 union drbd_state ns;
39 enum chg_state_flags flags;
40 struct completion *done;
41 };
42
43 enum sanitize_state_warnings {
44 NO_WARNING,
45 ABORTED_ONLINE_VERIFY,
46 ABORTED_RESYNC,
47 CONNECTION_LOST_NEGOTIATING,
48 IMPLICITLY_UPGRADED_DISK,
49 IMPLICITLY_UPGRADED_PDSK,
50 };
51
52 static int w_after_state_ch(struct drbd_work *w, int unused);
53 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
54 union drbd_state ns, enum chg_state_flags flags);
55 static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state);
56 static enum drbd_state_rv is_valid_soft_transition(union drbd_state, union drbd_state, struct drbd_tconn *);
57 static enum drbd_state_rv is_valid_transition(union drbd_state os, union drbd_state ns);
58 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns,
59 enum sanitize_state_warnings *warn);
60
61 static inline bool is_susp(union drbd_state s)
62 {
63 return s.susp || s.susp_nod || s.susp_fen;
64 }
65
66 bool conn_all_vols_unconf(struct drbd_tconn *tconn)
67 {
68 struct drbd_conf *mdev;
69 bool rv = true;
70 int vnr;
71
72 rcu_read_lock();
73 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
74 if (mdev->state.disk != D_DISKLESS ||
75 mdev->state.conn != C_STANDALONE ||
76 mdev->state.role != R_SECONDARY) {
77 rv = false;
78 break;
79 }
80 }
81 rcu_read_unlock();
82
83 return rv;
84 }
85
86 /* Unfortunately the states where not correctly ordered, when
87 they where defined. therefore can not use max_t() here. */
88 static enum drbd_role max_role(enum drbd_role role1, enum drbd_role role2)
89 {
90 if (role1 == R_PRIMARY || role2 == R_PRIMARY)
91 return R_PRIMARY;
92 if (role1 == R_SECONDARY || role2 == R_SECONDARY)
93 return R_SECONDARY;
94 return R_UNKNOWN;
95 }
96 static enum drbd_role min_role(enum drbd_role role1, enum drbd_role role2)
97 {
98 if (role1 == R_UNKNOWN || role2 == R_UNKNOWN)
99 return R_UNKNOWN;
100 if (role1 == R_SECONDARY || role2 == R_SECONDARY)
101 return R_SECONDARY;
102 return R_PRIMARY;
103 }
104
105 enum drbd_role conn_highest_role(struct drbd_tconn *tconn)
106 {
107 enum drbd_role role = R_UNKNOWN;
108 struct drbd_conf *mdev;
109 int vnr;
110
111 rcu_read_lock();
112 idr_for_each_entry(&tconn->volumes, mdev, vnr)
113 role = max_role(role, mdev->state.role);
114 rcu_read_unlock();
115
116 return role;
117 }
118
119 enum drbd_role conn_highest_peer(struct drbd_tconn *tconn)
120 {
121 enum drbd_role peer = R_UNKNOWN;
122 struct drbd_conf *mdev;
123 int vnr;
124
125 rcu_read_lock();
126 idr_for_each_entry(&tconn->volumes, mdev, vnr)
127 peer = max_role(peer, mdev->state.peer);
128 rcu_read_unlock();
129
130 return peer;
131 }
132
133 enum drbd_disk_state conn_highest_disk(struct drbd_tconn *tconn)
134 {
135 enum drbd_disk_state ds = D_DISKLESS;
136 struct drbd_conf *mdev;
137 int vnr;
138
139 rcu_read_lock();
140 idr_for_each_entry(&tconn->volumes, mdev, vnr)
141 ds = max_t(enum drbd_disk_state, ds, mdev->state.disk);
142 rcu_read_unlock();
143
144 return ds;
145 }
146
147 enum drbd_disk_state conn_lowest_disk(struct drbd_tconn *tconn)
148 {
149 enum drbd_disk_state ds = D_MASK;
150 struct drbd_conf *mdev;
151 int vnr;
152
153 rcu_read_lock();
154 idr_for_each_entry(&tconn->volumes, mdev, vnr)
155 ds = min_t(enum drbd_disk_state, ds, mdev->state.disk);
156 rcu_read_unlock();
157
158 return ds;
159 }
160
161 enum drbd_disk_state conn_highest_pdsk(struct drbd_tconn *tconn)
162 {
163 enum drbd_disk_state ds = D_DISKLESS;
164 struct drbd_conf *mdev;
165 int vnr;
166
167 rcu_read_lock();
168 idr_for_each_entry(&tconn->volumes, mdev, vnr)
169 ds = max_t(enum drbd_disk_state, ds, mdev->state.pdsk);
170 rcu_read_unlock();
171
172 return ds;
173 }
174
175 enum drbd_conns conn_lowest_conn(struct drbd_tconn *tconn)
176 {
177 enum drbd_conns conn = C_MASK;
178 struct drbd_conf *mdev;
179 int vnr;
180
181 rcu_read_lock();
182 idr_for_each_entry(&tconn->volumes, mdev, vnr)
183 conn = min_t(enum drbd_conns, conn, mdev->state.conn);
184 rcu_read_unlock();
185
186 return conn;
187 }
188
189 static bool no_peer_wf_report_params(struct drbd_tconn *tconn)
190 {
191 struct drbd_conf *mdev;
192 int vnr;
193 bool rv = true;
194
195 rcu_read_lock();
196 idr_for_each_entry(&tconn->volumes, mdev, vnr)
197 if (mdev->state.conn == C_WF_REPORT_PARAMS) {
198 rv = false;
199 break;
200 }
201 rcu_read_unlock();
202
203 return rv;
204 }
205
206
207 /**
208 * cl_wide_st_chg() - true if the state change is a cluster wide one
209 * @mdev: DRBD device.
210 * @os: old (current) state.
211 * @ns: new (wanted) state.
212 */
213 static int cl_wide_st_chg(struct drbd_conf *mdev,
214 union drbd_state os, union drbd_state ns)
215 {
216 return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED &&
217 ((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
218 (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
219 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
220 (os.disk != D_FAILED && ns.disk == D_FAILED))) ||
221 (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
222 (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S) ||
223 (os.conn == C_CONNECTED && ns.conn == C_WF_REPORT_PARAMS);
224 }
225
226 static union drbd_state
227 apply_mask_val(union drbd_state os, union drbd_state mask, union drbd_state val)
228 {
229 union drbd_state ns;
230 ns.i = (os.i & ~mask.i) | val.i;
231 return ns;
232 }
233
234 enum drbd_state_rv
235 drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
236 union drbd_state mask, union drbd_state val)
237 {
238 unsigned long flags;
239 union drbd_state ns;
240 enum drbd_state_rv rv;
241
242 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
243 ns = apply_mask_val(drbd_read_state(mdev), mask, val);
244 rv = _drbd_set_state(mdev, ns, f, NULL);
245 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
246
247 return rv;
248 }
249
250 /**
251 * drbd_force_state() - Impose a change which happens outside our control on our state
252 * @mdev: DRBD device.
253 * @mask: mask of state bits to change.
254 * @val: value of new state bits.
255 */
256 void drbd_force_state(struct drbd_conf *mdev,
257 union drbd_state mask, union drbd_state val)
258 {
259 drbd_change_state(mdev, CS_HARD, mask, val);
260 }
261
262 static enum drbd_state_rv
263 _req_st_cond(struct drbd_conf *mdev, union drbd_state mask,
264 union drbd_state val)
265 {
266 union drbd_state os, ns;
267 unsigned long flags;
268 enum drbd_state_rv rv;
269
270 if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
271 return SS_CW_SUCCESS;
272
273 if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
274 return SS_CW_FAILED_BY_PEER;
275
276 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
277 os = drbd_read_state(mdev);
278 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
279 rv = is_valid_transition(os, ns);
280 if (rv >= SS_SUCCESS)
281 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
282
283 if (!cl_wide_st_chg(mdev, os, ns))
284 rv = SS_CW_NO_NEED;
285 if (rv == SS_UNKNOWN_ERROR) {
286 rv = is_valid_state(mdev, ns);
287 if (rv >= SS_SUCCESS) {
288 rv = is_valid_soft_transition(os, ns, mdev->tconn);
289 if (rv >= SS_SUCCESS)
290 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
291 }
292 }
293 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
294
295 return rv;
296 }
297
298 /**
299 * drbd_req_state() - Perform an eventually cluster wide state change
300 * @mdev: DRBD device.
301 * @mask: mask of state bits to change.
302 * @val: value of new state bits.
303 * @f: flags
304 *
305 * Should not be called directly, use drbd_request_state() or
306 * _drbd_request_state().
307 */
308 static enum drbd_state_rv
309 drbd_req_state(struct drbd_conf *mdev, union drbd_state mask,
310 union drbd_state val, enum chg_state_flags f)
311 {
312 struct completion done;
313 unsigned long flags;
314 union drbd_state os, ns;
315 enum drbd_state_rv rv;
316
317 init_completion(&done);
318
319 if (f & CS_SERIALIZE)
320 mutex_lock(mdev->state_mutex);
321
322 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
323 os = drbd_read_state(mdev);
324 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
325 rv = is_valid_transition(os, ns);
326 if (rv < SS_SUCCESS) {
327 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
328 goto abort;
329 }
330
331 if (cl_wide_st_chg(mdev, os, ns)) {
332 rv = is_valid_state(mdev, ns);
333 if (rv == SS_SUCCESS)
334 rv = is_valid_soft_transition(os, ns, mdev->tconn);
335 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
336
337 if (rv < SS_SUCCESS) {
338 if (f & CS_VERBOSE)
339 print_st_err(mdev, os, ns, rv);
340 goto abort;
341 }
342
343 if (drbd_send_state_req(mdev, mask, val)) {
344 rv = SS_CW_FAILED_BY_PEER;
345 if (f & CS_VERBOSE)
346 print_st_err(mdev, os, ns, rv);
347 goto abort;
348 }
349
350 wait_event(mdev->state_wait,
351 (rv = _req_st_cond(mdev, mask, val)));
352
353 if (rv < SS_SUCCESS) {
354 if (f & CS_VERBOSE)
355 print_st_err(mdev, os, ns, rv);
356 goto abort;
357 }
358 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
359 ns = apply_mask_val(drbd_read_state(mdev), mask, val);
360 rv = _drbd_set_state(mdev, ns, f, &done);
361 } else {
362 rv = _drbd_set_state(mdev, ns, f, &done);
363 }
364
365 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
366
367 if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
368 D_ASSERT(current != mdev->tconn->worker.task);
369 wait_for_completion(&done);
370 }
371
372 abort:
373 if (f & CS_SERIALIZE)
374 mutex_unlock(mdev->state_mutex);
375
376 return rv;
377 }
378
379 /**
380 * _drbd_request_state() - Request a state change (with flags)
381 * @mdev: DRBD device.
382 * @mask: mask of state bits to change.
383 * @val: value of new state bits.
384 * @f: flags
385 *
386 * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE
387 * flag, or when logging of failed state change requests is not desired.
388 */
389 enum drbd_state_rv
390 _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask,
391 union drbd_state val, enum chg_state_flags f)
392 {
393 enum drbd_state_rv rv;
394
395 wait_event(mdev->state_wait,
396 (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE);
397
398 return rv;
399 }
400
401 static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns)
402 {
403 dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c%c%c }\n",
404 name,
405 drbd_conn_str(ns.conn),
406 drbd_role_str(ns.role),
407 drbd_role_str(ns.peer),
408 drbd_disk_str(ns.disk),
409 drbd_disk_str(ns.pdsk),
410 is_susp(ns) ? 's' : 'r',
411 ns.aftr_isp ? 'a' : '-',
412 ns.peer_isp ? 'p' : '-',
413 ns.user_isp ? 'u' : '-',
414 ns.susp_fen ? 'F' : '-',
415 ns.susp_nod ? 'N' : '-'
416 );
417 }
418
419 void print_st_err(struct drbd_conf *mdev, union drbd_state os,
420 union drbd_state ns, enum drbd_state_rv err)
421 {
422 if (err == SS_IN_TRANSIENT_STATE)
423 return;
424 dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err));
425 print_st(mdev, " state", os);
426 print_st(mdev, "wanted", ns);
427 }
428
429 static long print_state_change(char *pb, union drbd_state os, union drbd_state ns,
430 enum chg_state_flags flags)
431 {
432 char *pbp;
433 pbp = pb;
434 *pbp = 0;
435
436 if (ns.role != os.role && flags & CS_DC_ROLE)
437 pbp += sprintf(pbp, "role( %s -> %s ) ",
438 drbd_role_str(os.role),
439 drbd_role_str(ns.role));
440 if (ns.peer != os.peer && flags & CS_DC_PEER)
441 pbp += sprintf(pbp, "peer( %s -> %s ) ",
442 drbd_role_str(os.peer),
443 drbd_role_str(ns.peer));
444 if (ns.conn != os.conn && flags & CS_DC_CONN)
445 pbp += sprintf(pbp, "conn( %s -> %s ) ",
446 drbd_conn_str(os.conn),
447 drbd_conn_str(ns.conn));
448 if (ns.disk != os.disk && flags & CS_DC_DISK)
449 pbp += sprintf(pbp, "disk( %s -> %s ) ",
450 drbd_disk_str(os.disk),
451 drbd_disk_str(ns.disk));
452 if (ns.pdsk != os.pdsk && flags & CS_DC_PDSK)
453 pbp += sprintf(pbp, "pdsk( %s -> %s ) ",
454 drbd_disk_str(os.pdsk),
455 drbd_disk_str(ns.pdsk));
456
457 return pbp - pb;
458 }
459
460 static void drbd_pr_state_change(struct drbd_conf *mdev, union drbd_state os, union drbd_state ns,
461 enum chg_state_flags flags)
462 {
463 char pb[300];
464 char *pbp = pb;
465
466 pbp += print_state_change(pbp, os, ns, flags ^ CS_DC_MASK);
467
468 if (ns.aftr_isp != os.aftr_isp)
469 pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ",
470 os.aftr_isp,
471 ns.aftr_isp);
472 if (ns.peer_isp != os.peer_isp)
473 pbp += sprintf(pbp, "peer_isp( %d -> %d ) ",
474 os.peer_isp,
475 ns.peer_isp);
476 if (ns.user_isp != os.user_isp)
477 pbp += sprintf(pbp, "user_isp( %d -> %d ) ",
478 os.user_isp,
479 ns.user_isp);
480
481 if (pbp != pb)
482 dev_info(DEV, "%s\n", pb);
483 }
484
485 static void conn_pr_state_change(struct drbd_tconn *tconn, union drbd_state os, union drbd_state ns,
486 enum chg_state_flags flags)
487 {
488 char pb[300];
489 char *pbp = pb;
490
491 pbp += print_state_change(pbp, os, ns, flags);
492
493 if (is_susp(ns) != is_susp(os) && flags & CS_DC_SUSP)
494 pbp += sprintf(pbp, "susp( %d -> %d ) ",
495 is_susp(os),
496 is_susp(ns));
497
498 if (pbp != pb)
499 conn_info(tconn, "%s\n", pb);
500 }
501
502
503 /**
504 * is_valid_state() - Returns an SS_ error code if ns is not valid
505 * @mdev: DRBD device.
506 * @ns: State to consider.
507 */
508 static enum drbd_state_rv
509 is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
510 {
511 /* See drbd_state_sw_errors in drbd_strings.c */
512
513 enum drbd_fencing_p fp;
514 enum drbd_state_rv rv = SS_SUCCESS;
515 struct net_conf *nc;
516
517 rcu_read_lock();
518 fp = FP_DONT_CARE;
519 if (get_ldev(mdev)) {
520 fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
521 put_ldev(mdev);
522 }
523
524 nc = rcu_dereference(mdev->tconn->net_conf);
525 if (nc) {
526 if (!nc->two_primaries && ns.role == R_PRIMARY) {
527 if (ns.peer == R_PRIMARY)
528 rv = SS_TWO_PRIMARIES;
529 else if (conn_highest_peer(mdev->tconn) == R_PRIMARY)
530 rv = SS_O_VOL_PEER_PRI;
531 }
532 }
533
534 if (rv <= 0)
535 /* already found a reason to abort */;
536 else if (ns.role == R_SECONDARY && mdev->open_cnt)
537 rv = SS_DEVICE_IN_USE;
538
539 else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE)
540 rv = SS_NO_UP_TO_DATE_DISK;
541
542 else if (fp >= FP_RESOURCE &&
543 ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN)
544 rv = SS_PRIMARY_NOP;
545
546 else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT)
547 rv = SS_NO_UP_TO_DATE_DISK;
548
549 else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT)
550 rv = SS_NO_LOCAL_DISK;
551
552 else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT)
553 rv = SS_NO_REMOTE_DISK;
554
555 else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)
556 rv = SS_NO_UP_TO_DATE_DISK;
557
558 else if ((ns.conn == C_CONNECTED ||
559 ns.conn == C_WF_BITMAP_S ||
560 ns.conn == C_SYNC_SOURCE ||
561 ns.conn == C_PAUSED_SYNC_S) &&
562 ns.disk == D_OUTDATED)
563 rv = SS_CONNECTED_OUTDATES;
564
565 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
566 (nc->verify_alg[0] == 0))
567 rv = SS_NO_VERIFY_ALG;
568
569 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
570 mdev->tconn->agreed_pro_version < 88)
571 rv = SS_NOT_SUPPORTED;
572
573 else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN)
574 rv = SS_CONNECTED_OUTDATES;
575
576 rcu_read_unlock();
577
578 return rv;
579 }
580
581 /**
582 * is_valid_soft_transition() - Returns an SS_ error code if the state transition is not possible
583 * This function limits state transitions that may be declined by DRBD. I.e.
584 * user requests (aka soft transitions).
585 * @mdev: DRBD device.
586 * @ns: new state.
587 * @os: old state.
588 */
589 static enum drbd_state_rv
590 is_valid_soft_transition(union drbd_state os, union drbd_state ns, struct drbd_tconn *tconn)
591 {
592 enum drbd_state_rv rv = SS_SUCCESS;
593
594 if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) &&
595 os.conn > C_CONNECTED)
596 rv = SS_RESYNC_RUNNING;
597
598 if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE)
599 rv = SS_ALREADY_STANDALONE;
600
601 if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS)
602 rv = SS_IS_DISKLESS;
603
604 if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED)
605 rv = SS_NO_NET_CONFIG;
606
607 if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING)
608 rv = SS_LOWER_THAN_OUTDATED;
609
610 if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
611 rv = SS_IN_TRANSIENT_STATE;
612
613 /* if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
614 rv = SS_IN_TRANSIENT_STATE; */
615
616 /* While establishing a connection only allow cstate to change.
617 Delay/refuse role changes, detach attach etc... */
618 if (test_bit(STATE_SENT, &tconn->flags) &&
619 !(os.conn == C_WF_REPORT_PARAMS ||
620 (ns.conn == C_WF_REPORT_PARAMS && os.conn == C_WF_CONNECTION)))
621 rv = SS_IN_TRANSIENT_STATE;
622
623 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
624 rv = SS_NEED_CONNECTION;
625
626 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
627 ns.conn != os.conn && os.conn > C_CONNECTED)
628 rv = SS_RESYNC_RUNNING;
629
630 if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) &&
631 os.conn < C_CONNECTED)
632 rv = SS_NEED_CONNECTION;
633
634 if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)
635 && os.conn < C_WF_REPORT_PARAMS)
636 rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */
637
638 return rv;
639 }
640
641 static enum drbd_state_rv
642 is_valid_conn_transition(enum drbd_conns oc, enum drbd_conns nc)
643 {
644 /* no change -> nothing to do, at least for the connection part */
645 if (oc == nc)
646 return SS_NOTHING_TO_DO;
647
648 /* disconnect of an unconfigured connection does not make sense */
649 if (oc == C_STANDALONE && nc == C_DISCONNECTING)
650 return SS_ALREADY_STANDALONE;
651
652 /* from C_STANDALONE, we start with C_UNCONNECTED */
653 if (oc == C_STANDALONE && nc != C_UNCONNECTED)
654 return SS_NEED_CONNECTION;
655
656 /* When establishing a connection we need to go through WF_REPORT_PARAMS!
657 Necessary to do the right thing upon invalidate-remote on a disconnected resource */
658 if (oc < C_WF_REPORT_PARAMS && nc >= C_CONNECTED)
659 return SS_NEED_CONNECTION;
660
661 /* After a network error only C_UNCONNECTED or C_DISCONNECTING may follow. */
662 if (oc >= C_TIMEOUT && oc <= C_TEAR_DOWN && nc != C_UNCONNECTED && nc != C_DISCONNECTING)
663 return SS_IN_TRANSIENT_STATE;
664
665 /* After C_DISCONNECTING only C_STANDALONE may follow */
666 if (oc == C_DISCONNECTING && nc != C_STANDALONE)
667 return SS_IN_TRANSIENT_STATE;
668
669 return SS_SUCCESS;
670 }
671
672
673 /**
674 * is_valid_transition() - Returns an SS_ error code if the state transition is not possible
675 * This limits hard state transitions. Hard state transitions are facts there are
676 * imposed on DRBD by the environment. E.g. disk broke or network broke down.
677 * But those hard state transitions are still not allowed to do everything.
678 * @ns: new state.
679 * @os: old state.
680 */
681 static enum drbd_state_rv
682 is_valid_transition(union drbd_state os, union drbd_state ns)
683 {
684 enum drbd_state_rv rv;
685
686 rv = is_valid_conn_transition(os.conn, ns.conn);
687
688 /* we cannot fail (again) if we already detached */
689 if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
690 rv = SS_IS_DISKLESS;
691
692 return rv;
693 }
694
695 static void print_sanitize_warnings(struct drbd_conf *mdev, enum sanitize_state_warnings warn)
696 {
697 static const char *msg_table[] = {
698 [NO_WARNING] = "",
699 [ABORTED_ONLINE_VERIFY] = "Online-verify aborted.",
700 [ABORTED_RESYNC] = "Resync aborted.",
701 [CONNECTION_LOST_NEGOTIATING] = "Connection lost while negotiating, no data!",
702 [IMPLICITLY_UPGRADED_DISK] = "Implicitly upgraded disk",
703 [IMPLICITLY_UPGRADED_PDSK] = "Implicitly upgraded pdsk",
704 };
705
706 if (warn != NO_WARNING)
707 dev_warn(DEV, "%s\n", msg_table[warn]);
708 }
709
710 /**
711 * sanitize_state() - Resolves implicitly necessary additional changes to a state transition
712 * @mdev: DRBD device.
713 * @os: old state.
714 * @ns: new state.
715 * @warn_sync_abort:
716 *
717 * When we loose connection, we have to set the state of the peers disk (pdsk)
718 * to D_UNKNOWN. This rule and many more along those lines are in this function.
719 */
720 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns,
721 enum sanitize_state_warnings *warn)
722 {
723 enum drbd_fencing_p fp;
724 enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max;
725
726 if (warn)
727 *warn = NO_WARNING;
728
729 fp = FP_DONT_CARE;
730 if (get_ldev(mdev)) {
731 rcu_read_lock();
732 fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
733 rcu_read_unlock();
734 put_ldev(mdev);
735 }
736
737 /* Implications from connection to peer and peer_isp */
738 if (ns.conn < C_CONNECTED) {
739 ns.peer_isp = 0;
740 ns.peer = R_UNKNOWN;
741 if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT)
742 ns.pdsk = D_UNKNOWN;
743 }
744
745 /* Clear the aftr_isp when becoming unconfigured */
746 if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY)
747 ns.aftr_isp = 0;
748
749 /* An implication of the disk states onto the connection state */
750 /* Abort resync if a disk fails/detaches */
751 if (ns.conn > C_CONNECTED && (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
752 if (warn)
753 *warn = ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T ?
754 ABORTED_ONLINE_VERIFY : ABORTED_RESYNC;
755 ns.conn = C_CONNECTED;
756 }
757
758 /* Connection breaks down before we finished "Negotiating" */
759 if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING &&
760 get_ldev_if_state(mdev, D_NEGOTIATING)) {
761 if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) {
762 ns.disk = mdev->new_state_tmp.disk;
763 ns.pdsk = mdev->new_state_tmp.pdsk;
764 } else {
765 if (warn)
766 *warn = CONNECTION_LOST_NEGOTIATING;
767 ns.disk = D_DISKLESS;
768 ns.pdsk = D_UNKNOWN;
769 }
770 put_ldev(mdev);
771 }
772
773 /* D_CONSISTENT and D_OUTDATED vanish when we get connected */
774 if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) {
775 if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED)
776 ns.disk = D_UP_TO_DATE;
777 if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)
778 ns.pdsk = D_UP_TO_DATE;
779 }
780
781 /* Implications of the connection stat on the disk states */
782 disk_min = D_DISKLESS;
783 disk_max = D_UP_TO_DATE;
784 pdsk_min = D_INCONSISTENT;
785 pdsk_max = D_UNKNOWN;
786 switch ((enum drbd_conns)ns.conn) {
787 case C_WF_BITMAP_T:
788 case C_PAUSED_SYNC_T:
789 case C_STARTING_SYNC_T:
790 case C_WF_SYNC_UUID:
791 case C_BEHIND:
792 disk_min = D_INCONSISTENT;
793 disk_max = D_OUTDATED;
794 pdsk_min = D_UP_TO_DATE;
795 pdsk_max = D_UP_TO_DATE;
796 break;
797 case C_VERIFY_S:
798 case C_VERIFY_T:
799 disk_min = D_UP_TO_DATE;
800 disk_max = D_UP_TO_DATE;
801 pdsk_min = D_UP_TO_DATE;
802 pdsk_max = D_UP_TO_DATE;
803 break;
804 case C_CONNECTED:
805 disk_min = D_DISKLESS;
806 disk_max = D_UP_TO_DATE;
807 pdsk_min = D_DISKLESS;
808 pdsk_max = D_UP_TO_DATE;
809 break;
810 case C_WF_BITMAP_S:
811 case C_PAUSED_SYNC_S:
812 case C_STARTING_SYNC_S:
813 case C_AHEAD:
814 disk_min = D_UP_TO_DATE;
815 disk_max = D_UP_TO_DATE;
816 pdsk_min = D_INCONSISTENT;
817 pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/
818 break;
819 case C_SYNC_TARGET:
820 disk_min = D_INCONSISTENT;
821 disk_max = D_INCONSISTENT;
822 pdsk_min = D_UP_TO_DATE;
823 pdsk_max = D_UP_TO_DATE;
824 break;
825 case C_SYNC_SOURCE:
826 disk_min = D_UP_TO_DATE;
827 disk_max = D_UP_TO_DATE;
828 pdsk_min = D_INCONSISTENT;
829 pdsk_max = D_INCONSISTENT;
830 break;
831 case C_STANDALONE:
832 case C_DISCONNECTING:
833 case C_UNCONNECTED:
834 case C_TIMEOUT:
835 case C_BROKEN_PIPE:
836 case C_NETWORK_FAILURE:
837 case C_PROTOCOL_ERROR:
838 case C_TEAR_DOWN:
839 case C_WF_CONNECTION:
840 case C_WF_REPORT_PARAMS:
841 case C_MASK:
842 break;
843 }
844 if (ns.disk > disk_max)
845 ns.disk = disk_max;
846
847 if (ns.disk < disk_min) {
848 if (warn)
849 *warn = IMPLICITLY_UPGRADED_DISK;
850 ns.disk = disk_min;
851 }
852 if (ns.pdsk > pdsk_max)
853 ns.pdsk = pdsk_max;
854
855 if (ns.pdsk < pdsk_min) {
856 if (warn)
857 *warn = IMPLICITLY_UPGRADED_PDSK;
858 ns.pdsk = pdsk_min;
859 }
860
861 if (fp == FP_STONITH &&
862 (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED))
863 ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */
864
865 if (mdev->tconn->res_opts.on_no_data == OND_SUSPEND_IO &&
866 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
867 ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */
868
869 if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
870 if (ns.conn == C_SYNC_SOURCE)
871 ns.conn = C_PAUSED_SYNC_S;
872 if (ns.conn == C_SYNC_TARGET)
873 ns.conn = C_PAUSED_SYNC_T;
874 } else {
875 if (ns.conn == C_PAUSED_SYNC_S)
876 ns.conn = C_SYNC_SOURCE;
877 if (ns.conn == C_PAUSED_SYNC_T)
878 ns.conn = C_SYNC_TARGET;
879 }
880
881 return ns;
882 }
883
884 void drbd_resume_al(struct drbd_conf *mdev)
885 {
886 if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
887 dev_info(DEV, "Resumed AL updates\n");
888 }
889
890 /* helper for __drbd_set_state */
891 static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
892 {
893 if (mdev->tconn->agreed_pro_version < 90)
894 mdev->ov_start_sector = 0;
895 mdev->rs_total = drbd_bm_bits(mdev);
896 mdev->ov_position = 0;
897 if (cs == C_VERIFY_T) {
898 /* starting online verify from an arbitrary position
899 * does not fit well into the existing protocol.
900 * on C_VERIFY_T, we initialize ov_left and friends
901 * implicitly in receive_DataRequest once the
902 * first P_OV_REQUEST is received */
903 mdev->ov_start_sector = ~(sector_t)0;
904 } else {
905 unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector);
906 if (bit >= mdev->rs_total) {
907 mdev->ov_start_sector =
908 BM_BIT_TO_SECT(mdev->rs_total - 1);
909 mdev->rs_total = 1;
910 } else
911 mdev->rs_total -= bit;
912 mdev->ov_position = mdev->ov_start_sector;
913 }
914 mdev->ov_left = mdev->rs_total;
915 }
916
917 /**
918 * __drbd_set_state() - Set a new DRBD state
919 * @mdev: DRBD device.
920 * @ns: new state.
921 * @flags: Flags
922 * @done: Optional completion, that will get completed after the after_state_ch() finished
923 *
924 * Caller needs to hold req_lock, and global_state_lock. Do not call directly.
925 */
926 enum drbd_state_rv
927 __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
928 enum chg_state_flags flags, struct completion *done)
929 {
930 union drbd_state os;
931 enum drbd_state_rv rv = SS_SUCCESS;
932 enum sanitize_state_warnings ssw;
933 struct after_state_chg_work *ascw;
934
935 os = drbd_read_state(mdev);
936
937 ns = sanitize_state(mdev, ns, &ssw);
938 if (ns.i == os.i)
939 return SS_NOTHING_TO_DO;
940
941 rv = is_valid_transition(os, ns);
942 if (rv < SS_SUCCESS)
943 return rv;
944
945 if (!(flags & CS_HARD)) {
946 /* pre-state-change checks ; only look at ns */
947 /* See drbd_state_sw_errors in drbd_strings.c */
948
949 rv = is_valid_state(mdev, ns);
950 if (rv < SS_SUCCESS) {
951 /* If the old state was illegal as well, then let
952 this happen...*/
953
954 if (is_valid_state(mdev, os) == rv)
955 rv = is_valid_soft_transition(os, ns, mdev->tconn);
956 } else
957 rv = is_valid_soft_transition(os, ns, mdev->tconn);
958 }
959
960 if (rv < SS_SUCCESS) {
961 if (flags & CS_VERBOSE)
962 print_st_err(mdev, os, ns, rv);
963 return rv;
964 }
965
966 print_sanitize_warnings(mdev, ssw);
967
968 drbd_pr_state_change(mdev, os, ns, flags);
969
970 /* Display changes to the susp* flags that where caused by the call to
971 sanitize_state(). Only display it here if we where not called from
972 _conn_request_state() */
973 if (!(flags & CS_DC_SUSP))
974 conn_pr_state_change(mdev->tconn, os, ns, (flags & ~CS_DC_MASK) | CS_DC_SUSP);
975
976 /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
977 * on the ldev here, to be sure the transition -> D_DISKLESS resp.
978 * drbd_ldev_destroy() won't happen before our corresponding
979 * after_state_ch works run, where we put_ldev again. */
980 if ((os.disk != D_FAILED && ns.disk == D_FAILED) ||
981 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))
982 atomic_inc(&mdev->local_cnt);
983
984 mdev->state.i = ns.i;
985 mdev->tconn->susp = ns.susp;
986 mdev->tconn->susp_nod = ns.susp_nod;
987 mdev->tconn->susp_fen = ns.susp_fen;
988
989 if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING)
990 drbd_print_uuids(mdev, "attached to UUIDs");
991
992 /* Wake up role changes, that were delayed because of connection establishing */
993 if (os.conn == C_WF_REPORT_PARAMS && ns.conn != C_WF_REPORT_PARAMS &&
994 no_peer_wf_report_params(mdev->tconn))
995 clear_bit(STATE_SENT, &mdev->tconn->flags);
996
997 wake_up(&mdev->misc_wait);
998 wake_up(&mdev->state_wait);
999 wake_up(&mdev->tconn->ping_wait);
1000
1001 /* Aborted verify run, or we reached the stop sector.
1002 * Log the last position, unless end-of-device. */
1003 if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
1004 ns.conn <= C_CONNECTED) {
1005 mdev->ov_start_sector =
1006 BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left);
1007 if (mdev->ov_left)
1008 dev_info(DEV, "Online Verify reached sector %llu\n",
1009 (unsigned long long)mdev->ov_start_sector);
1010 }
1011
1012 if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
1013 (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
1014 dev_info(DEV, "Syncer continues.\n");
1015 mdev->rs_paused += (long)jiffies
1016 -(long)mdev->rs_mark_time[mdev->rs_last_mark];
1017 if (ns.conn == C_SYNC_TARGET)
1018 mod_timer(&mdev->resync_timer, jiffies);
1019 }
1020
1021 if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
1022 (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
1023 dev_info(DEV, "Resync suspended\n");
1024 mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
1025 }
1026
1027 if (os.conn == C_CONNECTED &&
1028 (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
1029 unsigned long now = jiffies;
1030 int i;
1031
1032 set_ov_position(mdev, ns.conn);
1033 mdev->rs_start = now;
1034 mdev->rs_last_events = 0;
1035 mdev->rs_last_sect_ev = 0;
1036 mdev->ov_last_oos_size = 0;
1037 mdev->ov_last_oos_start = 0;
1038
1039 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
1040 mdev->rs_mark_left[i] = mdev->ov_left;
1041 mdev->rs_mark_time[i] = now;
1042 }
1043
1044 drbd_rs_controller_reset(mdev);
1045
1046 if (ns.conn == C_VERIFY_S) {
1047 dev_info(DEV, "Starting Online Verify from sector %llu\n",
1048 (unsigned long long)mdev->ov_position);
1049 mod_timer(&mdev->resync_timer, jiffies);
1050 }
1051 }
1052
1053 if (get_ldev(mdev)) {
1054 u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
1055 MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
1056 MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
1057
1058 mdf &= ~MDF_AL_CLEAN;
1059 if (test_bit(CRASHED_PRIMARY, &mdev->flags))
1060 mdf |= MDF_CRASHED_PRIMARY;
1061 if (mdev->state.role == R_PRIMARY ||
1062 (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
1063 mdf |= MDF_PRIMARY_IND;
1064 if (mdev->state.conn > C_WF_REPORT_PARAMS)
1065 mdf |= MDF_CONNECTED_IND;
1066 if (mdev->state.disk > D_INCONSISTENT)
1067 mdf |= MDF_CONSISTENT;
1068 if (mdev->state.disk > D_OUTDATED)
1069 mdf |= MDF_WAS_UP_TO_DATE;
1070 if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
1071 mdf |= MDF_PEER_OUT_DATED;
1072 if (mdf != mdev->ldev->md.flags) {
1073 mdev->ldev->md.flags = mdf;
1074 drbd_md_mark_dirty(mdev);
1075 }
1076 if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
1077 drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
1078 put_ldev(mdev);
1079 }
1080
1081 /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
1082 if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
1083 os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
1084 set_bit(CONSIDER_RESYNC, &mdev->flags);
1085
1086 /* Receiver should clean up itself */
1087 if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
1088 drbd_thread_stop_nowait(&mdev->tconn->receiver);
1089
1090 /* Now the receiver finished cleaning up itself, it should die */
1091 if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
1092 drbd_thread_stop_nowait(&mdev->tconn->receiver);
1093
1094 /* Upon network failure, we need to restart the receiver. */
1095 if (os.conn > C_WF_CONNECTION &&
1096 ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
1097 drbd_thread_restart_nowait(&mdev->tconn->receiver);
1098
1099 /* Resume AL writing if we get a connection */
1100 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1101 drbd_resume_al(mdev);
1102
1103 /* remember last attach time so request_timer_fn() won't
1104 * kill newly established sessions while we are still trying to thaw
1105 * previously frozen IO */
1106 if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) &&
1107 ns.disk > D_NEGOTIATING)
1108 mdev->last_reattach_jif = jiffies;
1109
1110 ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
1111 if (ascw) {
1112 ascw->os = os;
1113 ascw->ns = ns;
1114 ascw->flags = flags;
1115 ascw->w.cb = w_after_state_ch;
1116 ascw->w.mdev = mdev;
1117 ascw->done = done;
1118 drbd_queue_work(&mdev->tconn->sender_work, &ascw->w);
1119 } else {
1120 dev_err(DEV, "Could not kmalloc an ascw\n");
1121 }
1122
1123 return rv;
1124 }
1125
1126 static int w_after_state_ch(struct drbd_work *w, int unused)
1127 {
1128 struct after_state_chg_work *ascw =
1129 container_of(w, struct after_state_chg_work, w);
1130 struct drbd_conf *mdev = w->mdev;
1131
1132 after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
1133 if (ascw->flags & CS_WAIT_COMPLETE) {
1134 D_ASSERT(ascw->done != NULL);
1135 complete(ascw->done);
1136 }
1137 kfree(ascw);
1138
1139 return 0;
1140 }
1141
1142 static void abw_start_sync(struct drbd_conf *mdev, int rv)
1143 {
1144 if (rv) {
1145 dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
1146 _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
1147 return;
1148 }
1149
1150 switch (mdev->state.conn) {
1151 case C_STARTING_SYNC_T:
1152 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
1153 break;
1154 case C_STARTING_SYNC_S:
1155 drbd_start_resync(mdev, C_SYNC_SOURCE);
1156 break;
1157 }
1158 }
1159
1160 int drbd_bitmap_io_from_worker(struct drbd_conf *mdev,
1161 int (*io_fn)(struct drbd_conf *),
1162 char *why, enum bm_flag flags)
1163 {
1164 int rv;
1165
1166 D_ASSERT(current == mdev->tconn->worker.task);
1167
1168 /* open coded non-blocking drbd_suspend_io(mdev); */
1169 set_bit(SUSPEND_IO, &mdev->flags);
1170
1171 drbd_bm_lock(mdev, why, flags);
1172 rv = io_fn(mdev);
1173 drbd_bm_unlock(mdev);
1174
1175 drbd_resume_io(mdev);
1176
1177 return rv;
1178 }
1179
1180 /**
1181 * after_state_ch() - Perform after state change actions that may sleep
1182 * @mdev: DRBD device.
1183 * @os: old state.
1184 * @ns: new state.
1185 * @flags: Flags
1186 */
1187 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
1188 union drbd_state ns, enum chg_state_flags flags)
1189 {
1190 struct sib_info sib;
1191
1192 sib.sib_reason = SIB_STATE_CHANGE;
1193 sib.os = os;
1194 sib.ns = ns;
1195
1196 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
1197 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1198 if (mdev->p_uuid)
1199 mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
1200 }
1201
1202 /* Inform userspace about the change... */
1203 drbd_bcast_event(mdev, &sib);
1204
1205 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
1206 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
1207 drbd_khelper(mdev, "pri-on-incon-degr");
1208
1209 /* Here we have the actions that are performed after a
1210 state change. This function might sleep */
1211
1212 if (ns.susp_nod) {
1213 struct drbd_tconn *tconn = mdev->tconn;
1214 enum drbd_req_event what = NOTHING;
1215
1216 spin_lock_irq(&tconn->req_lock);
1217 if (os.conn < C_CONNECTED && conn_lowest_conn(tconn) >= C_CONNECTED)
1218 what = RESEND;
1219
1220 if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) &&
1221 conn_lowest_disk(tconn) > D_NEGOTIATING)
1222 what = RESTART_FROZEN_DISK_IO;
1223
1224 if (tconn->susp_nod && what != NOTHING) {
1225 _tl_restart(tconn, what);
1226 _conn_request_state(tconn,
1227 (union drbd_state) { { .susp_nod = 1 } },
1228 (union drbd_state) { { .susp_nod = 0 } },
1229 CS_VERBOSE);
1230 }
1231 spin_unlock_irq(&tconn->req_lock);
1232 }
1233
1234 if (ns.susp_fen) {
1235 struct drbd_tconn *tconn = mdev->tconn;
1236
1237 spin_lock_irq(&tconn->req_lock);
1238 if (tconn->susp_fen && conn_lowest_conn(tconn) >= C_CONNECTED) {
1239 /* case2: The connection was established again: */
1240 struct drbd_conf *odev;
1241 int vnr;
1242
1243 rcu_read_lock();
1244 idr_for_each_entry(&tconn->volumes, odev, vnr)
1245 clear_bit(NEW_CUR_UUID, &odev->flags);
1246 rcu_read_unlock();
1247 _tl_restart(tconn, RESEND);
1248 _conn_request_state(tconn,
1249 (union drbd_state) { { .susp_fen = 1 } },
1250 (union drbd_state) { { .susp_fen = 0 } },
1251 CS_VERBOSE);
1252 }
1253 spin_unlock_irq(&tconn->req_lock);
1254 }
1255
1256 /* Became sync source. With protocol >= 96, we still need to send out
1257 * the sync uuid now. Need to do that before any drbd_send_state, or
1258 * the other side may go "paused sync" before receiving the sync uuids,
1259 * which is unexpected. */
1260 if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) &&
1261 (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) &&
1262 mdev->tconn->agreed_pro_version >= 96 && get_ldev(mdev)) {
1263 drbd_gen_and_send_sync_uuid(mdev);
1264 put_ldev(mdev);
1265 }
1266
1267 /* Do not change the order of the if above and the two below... */
1268 if (os.pdsk == D_DISKLESS &&
1269 ns.pdsk > D_DISKLESS && ns.pdsk != D_UNKNOWN) { /* attach on the peer */
1270 /* we probably will start a resync soon.
1271 * make sure those things are properly reset. */
1272 mdev->rs_total = 0;
1273 mdev->rs_failed = 0;
1274 atomic_set(&mdev->rs_pending_cnt, 0);
1275 drbd_rs_cancel_all(mdev);
1276
1277 drbd_send_uuids(mdev);
1278 drbd_send_state(mdev, ns);
1279 }
1280 /* No point in queuing send_bitmap if we don't have a connection
1281 * anymore, so check also the _current_ state, not only the new state
1282 * at the time this work was queued. */
1283 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S &&
1284 mdev->state.conn == C_WF_BITMAP_S)
1285 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL,
1286 "send_bitmap (WFBitMapS)",
1287 BM_LOCKED_TEST_ALLOWED);
1288
1289 /* Lost contact to peer's copy of the data */
1290 if ((os.pdsk >= D_INCONSISTENT &&
1291 os.pdsk != D_UNKNOWN &&
1292 os.pdsk != D_OUTDATED)
1293 && (ns.pdsk < D_INCONSISTENT ||
1294 ns.pdsk == D_UNKNOWN ||
1295 ns.pdsk == D_OUTDATED)) {
1296 if (get_ldev(mdev)) {
1297 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
1298 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1299 if (drbd_suspended(mdev)) {
1300 set_bit(NEW_CUR_UUID, &mdev->flags);
1301 } else {
1302 drbd_uuid_new_current(mdev);
1303 drbd_send_uuids(mdev);
1304 }
1305 }
1306 put_ldev(mdev);
1307 }
1308 }
1309
1310 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
1311 if (os.peer == R_SECONDARY && ns.peer == R_PRIMARY &&
1312 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1313 drbd_uuid_new_current(mdev);
1314 drbd_send_uuids(mdev);
1315 }
1316 /* D_DISKLESS Peer becomes secondary */
1317 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
1318 /* We may still be Primary ourselves.
1319 * No harm done if the bitmap still changes,
1320 * redirtied pages will follow later. */
1321 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
1322 "demote diskless peer", BM_LOCKED_SET_ALLOWED);
1323 put_ldev(mdev);
1324 }
1325
1326 /* Write out all changed bits on demote.
1327 * Though, no need to da that just yet
1328 * if there is a resync going on still */
1329 if (os.role == R_PRIMARY && ns.role == R_SECONDARY &&
1330 mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) {
1331 /* No changes to the bitmap expected this time, so assert that,
1332 * even though no harm was done if it did change. */
1333 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
1334 "demote", BM_LOCKED_TEST_ALLOWED);
1335 put_ldev(mdev);
1336 }
1337
1338 /* Last part of the attaching process ... */
1339 if (ns.conn >= C_CONNECTED &&
1340 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
1341 drbd_send_sizes(mdev, 0, 0); /* to start sync... */
1342 drbd_send_uuids(mdev);
1343 drbd_send_state(mdev, ns);
1344 }
1345
1346 /* We want to pause/continue resync, tell peer. */
1347 if (ns.conn >= C_CONNECTED &&
1348 ((os.aftr_isp != ns.aftr_isp) ||
1349 (os.user_isp != ns.user_isp)))
1350 drbd_send_state(mdev, ns);
1351
1352 /* In case one of the isp bits got set, suspend other devices. */
1353 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
1354 (ns.aftr_isp || ns.peer_isp || ns.user_isp))
1355 suspend_other_sg(mdev);
1356
1357 /* Make sure the peer gets informed about eventual state
1358 changes (ISP bits) while we were in WFReportParams. */
1359 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
1360 drbd_send_state(mdev, ns);
1361
1362 if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
1363 drbd_send_state(mdev, ns);
1364
1365 /* We are in the progress to start a full sync... */
1366 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
1367 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
1368 /* no other bitmap changes expected during this phase */
1369 drbd_queue_bitmap_io(mdev,
1370 &drbd_bmio_set_n_write, &abw_start_sync,
1371 "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED);
1372
1373 /* We are invalidating our self... */
1374 if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
1375 os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
1376 /* other bitmap operation expected during this phase */
1377 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL,
1378 "set_n_write from invalidate", BM_LOCKED_MASK);
1379
1380 /* first half of local IO error, failure to attach,
1381 * or administrative detach */
1382 if (os.disk != D_FAILED && ns.disk == D_FAILED) {
1383 enum drbd_io_error_p eh = EP_PASS_ON;
1384 int was_io_error = 0;
1385 /* corresponding get_ldev was in __drbd_set_state, to serialize
1386 * our cleanup here with the transition to D_DISKLESS.
1387 * But is is still not save to dreference ldev here, since
1388 * we might come from an failed Attach before ldev was set. */
1389 if (mdev->ldev) {
1390 rcu_read_lock();
1391 eh = rcu_dereference(mdev->ldev->disk_conf)->on_io_error;
1392 rcu_read_unlock();
1393
1394 was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
1395
1396 if (was_io_error && eh == EP_CALL_HELPER)
1397 drbd_khelper(mdev, "local-io-error");
1398
1399 /* Immediately allow completion of all application IO,
1400 * that waits for completion from the local disk,
1401 * if this was a force-detach due to disk_timeout
1402 * or administrator request (drbdsetup detach --force).
1403 * Do NOT abort otherwise.
1404 * Aborting local requests may cause serious problems,
1405 * if requests are completed to upper layers already,
1406 * and then later the already submitted local bio completes.
1407 * This can cause DMA into former bio pages that meanwhile
1408 * have been re-used for other things.
1409 * So aborting local requests may cause crashes,
1410 * or even worse, silent data corruption.
1411 */
1412 if (test_and_clear_bit(FORCE_DETACH, &mdev->flags))
1413 tl_abort_disk_io(mdev);
1414
1415 /* current state still has to be D_FAILED,
1416 * there is only one way out: to D_DISKLESS,
1417 * and that may only happen after our put_ldev below. */
1418 if (mdev->state.disk != D_FAILED)
1419 dev_err(DEV,
1420 "ASSERT FAILED: disk is %s during detach\n",
1421 drbd_disk_str(mdev->state.disk));
1422
1423 if (ns.conn >= C_CONNECTED)
1424 drbd_send_state(mdev, ns);
1425
1426 drbd_rs_cancel_all(mdev);
1427
1428 /* In case we want to get something to stable storage still,
1429 * this may be the last chance.
1430 * Following put_ldev may transition to D_DISKLESS. */
1431 drbd_md_sync(mdev);
1432 }
1433 put_ldev(mdev);
1434 }
1435
1436 /* second half of local IO error, failure to attach,
1437 * or administrative detach,
1438 * after local_cnt references have reached zero again */
1439 if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
1440 /* We must still be diskless,
1441 * re-attach has to be serialized with this! */
1442 if (mdev->state.disk != D_DISKLESS)
1443 dev_err(DEV,
1444 "ASSERT FAILED: disk is %s while going diskless\n",
1445 drbd_disk_str(mdev->state.disk));
1446
1447 if (ns.conn >= C_CONNECTED)
1448 drbd_send_state(mdev, ns);
1449 /* corresponding get_ldev in __drbd_set_state
1450 * this may finally trigger drbd_ldev_destroy. */
1451 put_ldev(mdev);
1452 }
1453
1454 /* Notify peer that I had a local IO error, and did not detached.. */
1455 if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT && ns.conn >= C_CONNECTED)
1456 drbd_send_state(mdev, ns);
1457
1458 /* Disks got bigger while they were detached */
1459 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
1460 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
1461 if (ns.conn == C_CONNECTED)
1462 resync_after_online_grow(mdev);
1463 }
1464
1465 /* A resync finished or aborted, wake paused devices... */
1466 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
1467 (os.peer_isp && !ns.peer_isp) ||
1468 (os.user_isp && !ns.user_isp))
1469 resume_next_sg(mdev);
1470
1471 /* sync target done with resync. Explicitly notify peer, even though
1472 * it should (at least for non-empty resyncs) already know itself. */
1473 if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
1474 drbd_send_state(mdev, ns);
1475
1476 /* Verify finished, or reached stop sector. Peer did not know about
1477 * the stop sector, and we may even have changed the stop sector during
1478 * verify to interrupt/stop early. Send the new state. */
1479 if (os.conn == C_VERIFY_S && ns.conn == C_CONNECTED
1480 && verify_can_do_stop_sector(mdev))
1481 drbd_send_state(mdev, ns);
1482
1483 /* This triggers bitmap writeout of potentially still unwritten pages
1484 * if the resync finished cleanly, or aborted because of peer disk
1485 * failure, or because of connection loss.
1486 * For resync aborted because of local disk failure, we cannot do
1487 * any bitmap writeout anymore.
1488 * No harm done if some bits change during this phase.
1489 */
1490 if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) {
1491 drbd_queue_bitmap_io(mdev, &drbd_bm_write_copy_pages, NULL,
1492 "write from resync_finished", BM_LOCKED_CHANGE_ALLOWED);
1493 put_ldev(mdev);
1494 }
1495
1496 if (ns.disk == D_DISKLESS &&
1497 ns.conn == C_STANDALONE &&
1498 ns.role == R_SECONDARY) {
1499 if (os.aftr_isp != ns.aftr_isp)
1500 resume_next_sg(mdev);
1501 }
1502
1503 drbd_md_sync(mdev);
1504 }
1505
1506 struct after_conn_state_chg_work {
1507 struct drbd_work w;
1508 enum drbd_conns oc;
1509 union drbd_state ns_min;
1510 union drbd_state ns_max; /* new, max state, over all mdevs */
1511 enum chg_state_flags flags;
1512 };
1513
1514 static int w_after_conn_state_ch(struct drbd_work *w, int unused)
1515 {
1516 struct after_conn_state_chg_work *acscw =
1517 container_of(w, struct after_conn_state_chg_work, w);
1518 struct drbd_tconn *tconn = w->tconn;
1519 enum drbd_conns oc = acscw->oc;
1520 union drbd_state ns_max = acscw->ns_max;
1521 struct drbd_conf *mdev;
1522 int vnr;
1523
1524 kfree(acscw);
1525
1526 /* Upon network configuration, we need to start the receiver */
1527 if (oc == C_STANDALONE && ns_max.conn == C_UNCONNECTED)
1528 drbd_thread_start(&tconn->receiver);
1529
1530 if (oc == C_DISCONNECTING && ns_max.conn == C_STANDALONE) {
1531 struct net_conf *old_conf;
1532
1533 mutex_lock(&tconn->conf_update);
1534 old_conf = tconn->net_conf;
1535 tconn->my_addr_len = 0;
1536 tconn->peer_addr_len = 0;
1537 rcu_assign_pointer(tconn->net_conf, NULL);
1538 conn_free_crypto(tconn);
1539 mutex_unlock(&tconn->conf_update);
1540
1541 synchronize_rcu();
1542 kfree(old_conf);
1543 }
1544
1545 if (ns_max.susp_fen) {
1546 /* case1: The outdate peer handler is successful: */
1547 if (ns_max.pdsk <= D_OUTDATED) {
1548 rcu_read_lock();
1549 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1550 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1551 drbd_uuid_new_current(mdev);
1552 clear_bit(NEW_CUR_UUID, &mdev->flags);
1553 }
1554 }
1555 rcu_read_unlock();
1556 spin_lock_irq(&tconn->req_lock);
1557 _tl_restart(tconn, CONNECTION_LOST_WHILE_PENDING);
1558 _conn_request_state(tconn,
1559 (union drbd_state) { { .susp_fen = 1 } },
1560 (union drbd_state) { { .susp_fen = 0 } },
1561 CS_VERBOSE);
1562 spin_unlock_irq(&tconn->req_lock);
1563 }
1564 }
1565 kref_put(&tconn->kref, &conn_destroy);
1566
1567 conn_md_sync(tconn);
1568
1569 return 0;
1570 }
1571
1572 void conn_old_common_state(struct drbd_tconn *tconn, union drbd_state *pcs, enum chg_state_flags *pf)
1573 {
1574 enum chg_state_flags flags = ~0;
1575 struct drbd_conf *mdev;
1576 int vnr, first_vol = 1;
1577 union drbd_dev_state os, cs = {
1578 { .role = R_SECONDARY,
1579 .peer = R_UNKNOWN,
1580 .conn = tconn->cstate,
1581 .disk = D_DISKLESS,
1582 .pdsk = D_UNKNOWN,
1583 } };
1584
1585 rcu_read_lock();
1586 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1587 os = mdev->state;
1588
1589 if (first_vol) {
1590 cs = os;
1591 first_vol = 0;
1592 continue;
1593 }
1594
1595 if (cs.role != os.role)
1596 flags &= ~CS_DC_ROLE;
1597
1598 if (cs.peer != os.peer)
1599 flags &= ~CS_DC_PEER;
1600
1601 if (cs.conn != os.conn)
1602 flags &= ~CS_DC_CONN;
1603
1604 if (cs.disk != os.disk)
1605 flags &= ~CS_DC_DISK;
1606
1607 if (cs.pdsk != os.pdsk)
1608 flags &= ~CS_DC_PDSK;
1609 }
1610 rcu_read_unlock();
1611
1612 *pf |= CS_DC_MASK;
1613 *pf &= flags;
1614 (*pcs).i = cs.i;
1615 }
1616
1617 static enum drbd_state_rv
1618 conn_is_valid_transition(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1619 enum chg_state_flags flags)
1620 {
1621 enum drbd_state_rv rv = SS_SUCCESS;
1622 union drbd_state ns, os;
1623 struct drbd_conf *mdev;
1624 int vnr;
1625
1626 rcu_read_lock();
1627 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1628 os = drbd_read_state(mdev);
1629 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
1630
1631 if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
1632 ns.disk = os.disk;
1633
1634 if (ns.i == os.i)
1635 continue;
1636
1637 rv = is_valid_transition(os, ns);
1638 if (rv < SS_SUCCESS)
1639 break;
1640
1641 if (!(flags & CS_HARD)) {
1642 rv = is_valid_state(mdev, ns);
1643 if (rv < SS_SUCCESS) {
1644 if (is_valid_state(mdev, os) == rv)
1645 rv = is_valid_soft_transition(os, ns, tconn);
1646 } else
1647 rv = is_valid_soft_transition(os, ns, tconn);
1648 }
1649 if (rv < SS_SUCCESS)
1650 break;
1651 }
1652 rcu_read_unlock();
1653
1654 if (rv < SS_SUCCESS && flags & CS_VERBOSE)
1655 print_st_err(mdev, os, ns, rv);
1656
1657 return rv;
1658 }
1659
1660 void
1661 conn_set_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1662 union drbd_state *pns_min, union drbd_state *pns_max, enum chg_state_flags flags)
1663 {
1664 union drbd_state ns, os, ns_max = { };
1665 union drbd_state ns_min = {
1666 { .role = R_MASK,
1667 .peer = R_MASK,
1668 .conn = val.conn,
1669 .disk = D_MASK,
1670 .pdsk = D_MASK
1671 } };
1672 struct drbd_conf *mdev;
1673 enum drbd_state_rv rv;
1674 int vnr, number_of_volumes = 0;
1675
1676 if (mask.conn == C_MASK) {
1677 /* remember last connect time so request_timer_fn() won't
1678 * kill newly established sessions while we are still trying to thaw
1679 * previously frozen IO */
1680 if (tconn->cstate != C_WF_REPORT_PARAMS && val.conn == C_WF_REPORT_PARAMS)
1681 tconn->last_reconnect_jif = jiffies;
1682
1683 tconn->cstate = val.conn;
1684 }
1685
1686 rcu_read_lock();
1687 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1688 number_of_volumes++;
1689 os = drbd_read_state(mdev);
1690 ns = apply_mask_val(os, mask, val);
1691 ns = sanitize_state(mdev, ns, NULL);
1692
1693 if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
1694 ns.disk = os.disk;
1695
1696 rv = __drbd_set_state(mdev, ns, flags, NULL);
1697 if (rv < SS_SUCCESS)
1698 BUG();
1699
1700 ns.i = mdev->state.i;
1701 ns_max.role = max_role(ns.role, ns_max.role);
1702 ns_max.peer = max_role(ns.peer, ns_max.peer);
1703 ns_max.conn = max_t(enum drbd_conns, ns.conn, ns_max.conn);
1704 ns_max.disk = max_t(enum drbd_disk_state, ns.disk, ns_max.disk);
1705 ns_max.pdsk = max_t(enum drbd_disk_state, ns.pdsk, ns_max.pdsk);
1706
1707 ns_min.role = min_role(ns.role, ns_min.role);
1708 ns_min.peer = min_role(ns.peer, ns_min.peer);
1709 ns_min.conn = min_t(enum drbd_conns, ns.conn, ns_min.conn);
1710 ns_min.disk = min_t(enum drbd_disk_state, ns.disk, ns_min.disk);
1711 ns_min.pdsk = min_t(enum drbd_disk_state, ns.pdsk, ns_min.pdsk);
1712 }
1713 rcu_read_unlock();
1714
1715 if (number_of_volumes == 0) {
1716 ns_min = ns_max = (union drbd_state) { {
1717 .role = R_SECONDARY,
1718 .peer = R_UNKNOWN,
1719 .conn = val.conn,
1720 .disk = D_DISKLESS,
1721 .pdsk = D_UNKNOWN
1722 } };
1723 }
1724
1725 ns_min.susp = ns_max.susp = tconn->susp;
1726 ns_min.susp_nod = ns_max.susp_nod = tconn->susp_nod;
1727 ns_min.susp_fen = ns_max.susp_fen = tconn->susp_fen;
1728
1729 *pns_min = ns_min;
1730 *pns_max = ns_max;
1731 }
1732
1733 static enum drbd_state_rv
1734 _conn_rq_cond(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val)
1735 {
1736 enum drbd_state_rv rv;
1737
1738 if (test_and_clear_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags))
1739 return SS_CW_SUCCESS;
1740
1741 if (test_and_clear_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags))
1742 return SS_CW_FAILED_BY_PEER;
1743
1744 rv = tconn->cstate != C_WF_REPORT_PARAMS ? SS_CW_NO_NEED : SS_UNKNOWN_ERROR;
1745
1746 if (rv == SS_UNKNOWN_ERROR)
1747 rv = conn_is_valid_transition(tconn, mask, val, 0);
1748
1749 if (rv == SS_SUCCESS)
1750 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
1751
1752 return rv;
1753 }
1754
1755 enum drbd_state_rv
1756 _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1757 enum chg_state_flags flags)
1758 {
1759 enum drbd_state_rv rv = SS_SUCCESS;
1760 struct after_conn_state_chg_work *acscw;
1761 enum drbd_conns oc = tconn->cstate;
1762 union drbd_state ns_max, ns_min, os;
1763 bool have_mutex = false;
1764
1765 if (mask.conn) {
1766 rv = is_valid_conn_transition(oc, val.conn);
1767 if (rv < SS_SUCCESS)
1768 goto abort;
1769 }
1770
1771 rv = conn_is_valid_transition(tconn, mask, val, flags);
1772 if (rv < SS_SUCCESS)
1773 goto abort;
1774
1775 if (oc == C_WF_REPORT_PARAMS && val.conn == C_DISCONNECTING &&
1776 !(flags & (CS_LOCAL_ONLY | CS_HARD))) {
1777
1778 /* This will be a cluster-wide state change.
1779 * Need to give up the spinlock, grab the mutex,
1780 * then send the state change request, ... */
1781 spin_unlock_irq(&tconn->req_lock);
1782 mutex_lock(&tconn->cstate_mutex);
1783 have_mutex = true;
1784
1785 set_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
1786 if (conn_send_state_req(tconn, mask, val)) {
1787 /* sending failed. */
1788 clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
1789 rv = SS_CW_FAILED_BY_PEER;
1790 /* need to re-aquire the spin lock, though */
1791 goto abort_unlocked;
1792 }
1793
1794 if (val.conn == C_DISCONNECTING)
1795 set_bit(DISCONNECT_SENT, &tconn->flags);
1796
1797 /* ... and re-aquire the spinlock.
1798 * If _conn_rq_cond() returned >= SS_SUCCESS, we must call
1799 * conn_set_state() within the same spinlock. */
1800 spin_lock_irq(&tconn->req_lock);
1801 wait_event_lock_irq(tconn->ping_wait,
1802 (rv = _conn_rq_cond(tconn, mask, val)),
1803 tconn->req_lock);
1804 clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
1805 if (rv < SS_SUCCESS)
1806 goto abort;
1807 }
1808
1809 conn_old_common_state(tconn, &os, &flags);
1810 flags |= CS_DC_SUSP;
1811 conn_set_state(tconn, mask, val, &ns_min, &ns_max, flags);
1812 conn_pr_state_change(tconn, os, ns_max, flags);
1813
1814 acscw = kmalloc(sizeof(*acscw), GFP_ATOMIC);
1815 if (acscw) {
1816 acscw->oc = os.conn;
1817 acscw->ns_min = ns_min;
1818 acscw->ns_max = ns_max;
1819 acscw->flags = flags;
1820 acscw->w.cb = w_after_conn_state_ch;
1821 kref_get(&tconn->kref);
1822 acscw->w.tconn = tconn;
1823 drbd_queue_work(&tconn->sender_work, &acscw->w);
1824 } else {
1825 conn_err(tconn, "Could not kmalloc an acscw\n");
1826 }
1827
1828 abort:
1829 if (have_mutex) {
1830 /* mutex_unlock() "... must not be used in interrupt context.",
1831 * so give up the spinlock, then re-aquire it */
1832 spin_unlock_irq(&tconn->req_lock);
1833 abort_unlocked:
1834 mutex_unlock(&tconn->cstate_mutex);
1835 spin_lock_irq(&tconn->req_lock);
1836 }
1837 if (rv < SS_SUCCESS && flags & CS_VERBOSE) {
1838 conn_err(tconn, "State change failed: %s\n", drbd_set_st_err_str(rv));
1839 conn_err(tconn, " mask = 0x%x val = 0x%x\n", mask.i, val.i);
1840 conn_err(tconn, " old_conn:%s wanted_conn:%s\n", drbd_conn_str(oc), drbd_conn_str(val.conn));
1841 }
1842 return rv;
1843 }
1844
1845 enum drbd_state_rv
1846 conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1847 enum chg_state_flags flags)
1848 {
1849 enum drbd_state_rv rv;
1850
1851 spin_lock_irq(&tconn->req_lock);
1852 rv = _conn_request_state(tconn, mask, val, flags);
1853 spin_unlock_irq(&tconn->req_lock);
1854
1855 return rv;
1856 }
Linux kernel - Deliverables
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