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Merge branch 'drm-nouveau-fixes-3.8' of git://anongit.freedesktop.org/git/nouveau...
[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 bool did_remote, should_do_remote;
935
936 os = drbd_read_state(mdev);
937
938 ns = sanitize_state(mdev, ns, &ssw);
939 if (ns.i == os.i)
940 return SS_NOTHING_TO_DO;
941
942 rv = is_valid_transition(os, ns);
943 if (rv < SS_SUCCESS)
944 return rv;
945
946 if (!(flags & CS_HARD)) {
947 /* pre-state-change checks ; only look at ns */
948 /* See drbd_state_sw_errors in drbd_strings.c */
949
950 rv = is_valid_state(mdev, ns);
951 if (rv < SS_SUCCESS) {
952 /* If the old state was illegal as well, then let
953 this happen...*/
954
955 if (is_valid_state(mdev, os) == rv)
956 rv = is_valid_soft_transition(os, ns, mdev->tconn);
957 } else
958 rv = is_valid_soft_transition(os, ns, mdev->tconn);
959 }
960
961 if (rv < SS_SUCCESS) {
962 if (flags & CS_VERBOSE)
963 print_st_err(mdev, os, ns, rv);
964 return rv;
965 }
966
967 print_sanitize_warnings(mdev, ssw);
968
969 drbd_pr_state_change(mdev, os, ns, flags);
970
971 /* Display changes to the susp* flags that where caused by the call to
972 sanitize_state(). Only display it here if we where not called from
973 _conn_request_state() */
974 if (!(flags & CS_DC_SUSP))
975 conn_pr_state_change(mdev->tconn, os, ns, (flags & ~CS_DC_MASK) | CS_DC_SUSP);
976
977 /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
978 * on the ldev here, to be sure the transition -> D_DISKLESS resp.
979 * drbd_ldev_destroy() won't happen before our corresponding
980 * after_state_ch works run, where we put_ldev again. */
981 if ((os.disk != D_FAILED && ns.disk == D_FAILED) ||
982 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))
983 atomic_inc(&mdev->local_cnt);
984
985 did_remote = drbd_should_do_remote(mdev->state);
986 mdev->state.i = ns.i;
987 should_do_remote = drbd_should_do_remote(mdev->state);
988 mdev->tconn->susp = ns.susp;
989 mdev->tconn->susp_nod = ns.susp_nod;
990 mdev->tconn->susp_fen = ns.susp_fen;
991
992 /* put replicated vs not-replicated requests in seperate epochs */
993 if (did_remote != should_do_remote)
994 start_new_tl_epoch(mdev->tconn);
995
996 if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING)
997 drbd_print_uuids(mdev, "attached to UUIDs");
998
999 /* Wake up role changes, that were delayed because of connection establishing */
1000 if (os.conn == C_WF_REPORT_PARAMS && ns.conn != C_WF_REPORT_PARAMS &&
1001 no_peer_wf_report_params(mdev->tconn))
1002 clear_bit(STATE_SENT, &mdev->tconn->flags);
1003
1004 wake_up(&mdev->misc_wait);
1005 wake_up(&mdev->state_wait);
1006 wake_up(&mdev->tconn->ping_wait);
1007
1008 /* Aborted verify run, or we reached the stop sector.
1009 * Log the last position, unless end-of-device. */
1010 if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
1011 ns.conn <= C_CONNECTED) {
1012 mdev->ov_start_sector =
1013 BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left);
1014 if (mdev->ov_left)
1015 dev_info(DEV, "Online Verify reached sector %llu\n",
1016 (unsigned long long)mdev->ov_start_sector);
1017 }
1018
1019 if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
1020 (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
1021 dev_info(DEV, "Syncer continues.\n");
1022 mdev->rs_paused += (long)jiffies
1023 -(long)mdev->rs_mark_time[mdev->rs_last_mark];
1024 if (ns.conn == C_SYNC_TARGET)
1025 mod_timer(&mdev->resync_timer, jiffies);
1026 }
1027
1028 if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
1029 (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
1030 dev_info(DEV, "Resync suspended\n");
1031 mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
1032 }
1033
1034 if (os.conn == C_CONNECTED &&
1035 (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
1036 unsigned long now = jiffies;
1037 int i;
1038
1039 set_ov_position(mdev, ns.conn);
1040 mdev->rs_start = now;
1041 mdev->rs_last_events = 0;
1042 mdev->rs_last_sect_ev = 0;
1043 mdev->ov_last_oos_size = 0;
1044 mdev->ov_last_oos_start = 0;
1045
1046 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
1047 mdev->rs_mark_left[i] = mdev->ov_left;
1048 mdev->rs_mark_time[i] = now;
1049 }
1050
1051 drbd_rs_controller_reset(mdev);
1052
1053 if (ns.conn == C_VERIFY_S) {
1054 dev_info(DEV, "Starting Online Verify from sector %llu\n",
1055 (unsigned long long)mdev->ov_position);
1056 mod_timer(&mdev->resync_timer, jiffies);
1057 }
1058 }
1059
1060 if (get_ldev(mdev)) {
1061 u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
1062 MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
1063 MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
1064
1065 mdf &= ~MDF_AL_CLEAN;
1066 if (test_bit(CRASHED_PRIMARY, &mdev->flags))
1067 mdf |= MDF_CRASHED_PRIMARY;
1068 if (mdev->state.role == R_PRIMARY ||
1069 (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
1070 mdf |= MDF_PRIMARY_IND;
1071 if (mdev->state.conn > C_WF_REPORT_PARAMS)
1072 mdf |= MDF_CONNECTED_IND;
1073 if (mdev->state.disk > D_INCONSISTENT)
1074 mdf |= MDF_CONSISTENT;
1075 if (mdev->state.disk > D_OUTDATED)
1076 mdf |= MDF_WAS_UP_TO_DATE;
1077 if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
1078 mdf |= MDF_PEER_OUT_DATED;
1079 if (mdf != mdev->ldev->md.flags) {
1080 mdev->ldev->md.flags = mdf;
1081 drbd_md_mark_dirty(mdev);
1082 }
1083 if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
1084 drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
1085 put_ldev(mdev);
1086 }
1087
1088 /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
1089 if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
1090 os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
1091 set_bit(CONSIDER_RESYNC, &mdev->flags);
1092
1093 /* Receiver should clean up itself */
1094 if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
1095 drbd_thread_stop_nowait(&mdev->tconn->receiver);
1096
1097 /* Now the receiver finished cleaning up itself, it should die */
1098 if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
1099 drbd_thread_stop_nowait(&mdev->tconn->receiver);
1100
1101 /* Upon network failure, we need to restart the receiver. */
1102 if (os.conn > C_WF_CONNECTION &&
1103 ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
1104 drbd_thread_restart_nowait(&mdev->tconn->receiver);
1105
1106 /* Resume AL writing if we get a connection */
1107 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1108 drbd_resume_al(mdev);
1109
1110 /* remember last attach time so request_timer_fn() won't
1111 * kill newly established sessions while we are still trying to thaw
1112 * previously frozen IO */
1113 if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) &&
1114 ns.disk > D_NEGOTIATING)
1115 mdev->last_reattach_jif = jiffies;
1116
1117 ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
1118 if (ascw) {
1119 ascw->os = os;
1120 ascw->ns = ns;
1121 ascw->flags = flags;
1122 ascw->w.cb = w_after_state_ch;
1123 ascw->w.mdev = mdev;
1124 ascw->done = done;
1125 drbd_queue_work(&mdev->tconn->sender_work, &ascw->w);
1126 } else {
1127 dev_err(DEV, "Could not kmalloc an ascw\n");
1128 }
1129
1130 return rv;
1131 }
1132
1133 static int w_after_state_ch(struct drbd_work *w, int unused)
1134 {
1135 struct after_state_chg_work *ascw =
1136 container_of(w, struct after_state_chg_work, w);
1137 struct drbd_conf *mdev = w->mdev;
1138
1139 after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
1140 if (ascw->flags & CS_WAIT_COMPLETE) {
1141 D_ASSERT(ascw->done != NULL);
1142 complete(ascw->done);
1143 }
1144 kfree(ascw);
1145
1146 return 0;
1147 }
1148
1149 static void abw_start_sync(struct drbd_conf *mdev, int rv)
1150 {
1151 if (rv) {
1152 dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
1153 _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
1154 return;
1155 }
1156
1157 switch (mdev->state.conn) {
1158 case C_STARTING_SYNC_T:
1159 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
1160 break;
1161 case C_STARTING_SYNC_S:
1162 drbd_start_resync(mdev, C_SYNC_SOURCE);
1163 break;
1164 }
1165 }
1166
1167 int drbd_bitmap_io_from_worker(struct drbd_conf *mdev,
1168 int (*io_fn)(struct drbd_conf *),
1169 char *why, enum bm_flag flags)
1170 {
1171 int rv;
1172
1173 D_ASSERT(current == mdev->tconn->worker.task);
1174
1175 /* open coded non-blocking drbd_suspend_io(mdev); */
1176 set_bit(SUSPEND_IO, &mdev->flags);
1177
1178 drbd_bm_lock(mdev, why, flags);
1179 rv = io_fn(mdev);
1180 drbd_bm_unlock(mdev);
1181
1182 drbd_resume_io(mdev);
1183
1184 return rv;
1185 }
1186
1187 /**
1188 * after_state_ch() - Perform after state change actions that may sleep
1189 * @mdev: DRBD device.
1190 * @os: old state.
1191 * @ns: new state.
1192 * @flags: Flags
1193 */
1194 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
1195 union drbd_state ns, enum chg_state_flags flags)
1196 {
1197 struct sib_info sib;
1198
1199 sib.sib_reason = SIB_STATE_CHANGE;
1200 sib.os = os;
1201 sib.ns = ns;
1202
1203 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
1204 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1205 if (mdev->p_uuid)
1206 mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
1207 }
1208
1209 /* Inform userspace about the change... */
1210 drbd_bcast_event(mdev, &sib);
1211
1212 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
1213 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
1214 drbd_khelper(mdev, "pri-on-incon-degr");
1215
1216 /* Here we have the actions that are performed after a
1217 state change. This function might sleep */
1218
1219 if (ns.susp_nod) {
1220 struct drbd_tconn *tconn = mdev->tconn;
1221 enum drbd_req_event what = NOTHING;
1222
1223 spin_lock_irq(&tconn->req_lock);
1224 if (os.conn < C_CONNECTED && conn_lowest_conn(tconn) >= C_CONNECTED)
1225 what = RESEND;
1226
1227 if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) &&
1228 conn_lowest_disk(tconn) > D_NEGOTIATING)
1229 what = RESTART_FROZEN_DISK_IO;
1230
1231 if (tconn->susp_nod && what != NOTHING) {
1232 _tl_restart(tconn, what);
1233 _conn_request_state(tconn,
1234 (union drbd_state) { { .susp_nod = 1 } },
1235 (union drbd_state) { { .susp_nod = 0 } },
1236 CS_VERBOSE);
1237 }
1238 spin_unlock_irq(&tconn->req_lock);
1239 }
1240
1241 if (ns.susp_fen) {
1242 struct drbd_tconn *tconn = mdev->tconn;
1243
1244 spin_lock_irq(&tconn->req_lock);
1245 if (tconn->susp_fen && conn_lowest_conn(tconn) >= C_CONNECTED) {
1246 /* case2: The connection was established again: */
1247 struct drbd_conf *odev;
1248 int vnr;
1249
1250 rcu_read_lock();
1251 idr_for_each_entry(&tconn->volumes, odev, vnr)
1252 clear_bit(NEW_CUR_UUID, &odev->flags);
1253 rcu_read_unlock();
1254 _tl_restart(tconn, RESEND);
1255 _conn_request_state(tconn,
1256 (union drbd_state) { { .susp_fen = 1 } },
1257 (union drbd_state) { { .susp_fen = 0 } },
1258 CS_VERBOSE);
1259 }
1260 spin_unlock_irq(&tconn->req_lock);
1261 }
1262
1263 /* Became sync source. With protocol >= 96, we still need to send out
1264 * the sync uuid now. Need to do that before any drbd_send_state, or
1265 * the other side may go "paused sync" before receiving the sync uuids,
1266 * which is unexpected. */
1267 if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) &&
1268 (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) &&
1269 mdev->tconn->agreed_pro_version >= 96 && get_ldev(mdev)) {
1270 drbd_gen_and_send_sync_uuid(mdev);
1271 put_ldev(mdev);
1272 }
1273
1274 /* Do not change the order of the if above and the two below... */
1275 if (os.pdsk == D_DISKLESS &&
1276 ns.pdsk > D_DISKLESS && ns.pdsk != D_UNKNOWN) { /* attach on the peer */
1277 /* we probably will start a resync soon.
1278 * make sure those things are properly reset. */
1279 mdev->rs_total = 0;
1280 mdev->rs_failed = 0;
1281 atomic_set(&mdev->rs_pending_cnt, 0);
1282 drbd_rs_cancel_all(mdev);
1283
1284 drbd_send_uuids(mdev);
1285 drbd_send_state(mdev, ns);
1286 }
1287 /* No point in queuing send_bitmap if we don't have a connection
1288 * anymore, so check also the _current_ state, not only the new state
1289 * at the time this work was queued. */
1290 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S &&
1291 mdev->state.conn == C_WF_BITMAP_S)
1292 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL,
1293 "send_bitmap (WFBitMapS)",
1294 BM_LOCKED_TEST_ALLOWED);
1295
1296 /* Lost contact to peer's copy of the data */
1297 if ((os.pdsk >= D_INCONSISTENT &&
1298 os.pdsk != D_UNKNOWN &&
1299 os.pdsk != D_OUTDATED)
1300 && (ns.pdsk < D_INCONSISTENT ||
1301 ns.pdsk == D_UNKNOWN ||
1302 ns.pdsk == D_OUTDATED)) {
1303 if (get_ldev(mdev)) {
1304 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
1305 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1306 if (drbd_suspended(mdev)) {
1307 set_bit(NEW_CUR_UUID, &mdev->flags);
1308 } else {
1309 drbd_uuid_new_current(mdev);
1310 drbd_send_uuids(mdev);
1311 }
1312 }
1313 put_ldev(mdev);
1314 }
1315 }
1316
1317 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
1318 if (os.peer == R_SECONDARY && ns.peer == R_PRIMARY &&
1319 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1320 drbd_uuid_new_current(mdev);
1321 drbd_send_uuids(mdev);
1322 }
1323 /* D_DISKLESS Peer becomes secondary */
1324 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
1325 /* We may still be Primary ourselves.
1326 * No harm done if the bitmap still changes,
1327 * redirtied pages will follow later. */
1328 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
1329 "demote diskless peer", BM_LOCKED_SET_ALLOWED);
1330 put_ldev(mdev);
1331 }
1332
1333 /* Write out all changed bits on demote.
1334 * Though, no need to da that just yet
1335 * if there is a resync going on still */
1336 if (os.role == R_PRIMARY && ns.role == R_SECONDARY &&
1337 mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) {
1338 /* No changes to the bitmap expected this time, so assert that,
1339 * even though no harm was done if it did change. */
1340 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
1341 "demote", BM_LOCKED_TEST_ALLOWED);
1342 put_ldev(mdev);
1343 }
1344
1345 /* Last part of the attaching process ... */
1346 if (ns.conn >= C_CONNECTED &&
1347 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
1348 drbd_send_sizes(mdev, 0, 0); /* to start sync... */
1349 drbd_send_uuids(mdev);
1350 drbd_send_state(mdev, ns);
1351 }
1352
1353 /* We want to pause/continue resync, tell peer. */
1354 if (ns.conn >= C_CONNECTED &&
1355 ((os.aftr_isp != ns.aftr_isp) ||
1356 (os.user_isp != ns.user_isp)))
1357 drbd_send_state(mdev, ns);
1358
1359 /* In case one of the isp bits got set, suspend other devices. */
1360 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
1361 (ns.aftr_isp || ns.peer_isp || ns.user_isp))
1362 suspend_other_sg(mdev);
1363
1364 /* Make sure the peer gets informed about eventual state
1365 changes (ISP bits) while we were in WFReportParams. */
1366 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
1367 drbd_send_state(mdev, ns);
1368
1369 if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
1370 drbd_send_state(mdev, ns);
1371
1372 /* We are in the progress to start a full sync... */
1373 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
1374 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
1375 /* no other bitmap changes expected during this phase */
1376 drbd_queue_bitmap_io(mdev,
1377 &drbd_bmio_set_n_write, &abw_start_sync,
1378 "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED);
1379
1380 /* We are invalidating our self... */
1381 if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
1382 os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
1383 /* other bitmap operation expected during this phase */
1384 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL,
1385 "set_n_write from invalidate", BM_LOCKED_MASK);
1386
1387 /* first half of local IO error, failure to attach,
1388 * or administrative detach */
1389 if (os.disk != D_FAILED && ns.disk == D_FAILED) {
1390 enum drbd_io_error_p eh = EP_PASS_ON;
1391 int was_io_error = 0;
1392 /* corresponding get_ldev was in __drbd_set_state, to serialize
1393 * our cleanup here with the transition to D_DISKLESS.
1394 * But is is still not save to dreference ldev here, since
1395 * we might come from an failed Attach before ldev was set. */
1396 if (mdev->ldev) {
1397 rcu_read_lock();
1398 eh = rcu_dereference(mdev->ldev->disk_conf)->on_io_error;
1399 rcu_read_unlock();
1400
1401 was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
1402
1403 if (was_io_error && eh == EP_CALL_HELPER)
1404 drbd_khelper(mdev, "local-io-error");
1405
1406 /* Immediately allow completion of all application IO,
1407 * that waits for completion from the local disk,
1408 * if this was a force-detach due to disk_timeout
1409 * or administrator request (drbdsetup detach --force).
1410 * Do NOT abort otherwise.
1411 * Aborting local requests may cause serious problems,
1412 * if requests are completed to upper layers already,
1413 * and then later the already submitted local bio completes.
1414 * This can cause DMA into former bio pages that meanwhile
1415 * have been re-used for other things.
1416 * So aborting local requests may cause crashes,
1417 * or even worse, silent data corruption.
1418 */
1419 if (test_and_clear_bit(FORCE_DETACH, &mdev->flags))
1420 tl_abort_disk_io(mdev);
1421
1422 /* current state still has to be D_FAILED,
1423 * there is only one way out: to D_DISKLESS,
1424 * and that may only happen after our put_ldev below. */
1425 if (mdev->state.disk != D_FAILED)
1426 dev_err(DEV,
1427 "ASSERT FAILED: disk is %s during detach\n",
1428 drbd_disk_str(mdev->state.disk));
1429
1430 if (ns.conn >= C_CONNECTED)
1431 drbd_send_state(mdev, ns);
1432
1433 drbd_rs_cancel_all(mdev);
1434
1435 /* In case we want to get something to stable storage still,
1436 * this may be the last chance.
1437 * Following put_ldev may transition to D_DISKLESS. */
1438 drbd_md_sync(mdev);
1439 }
1440 put_ldev(mdev);
1441 }
1442
1443 /* second half of local IO error, failure to attach,
1444 * or administrative detach,
1445 * after local_cnt references have reached zero again */
1446 if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
1447 /* We must still be diskless,
1448 * re-attach has to be serialized with this! */
1449 if (mdev->state.disk != D_DISKLESS)
1450 dev_err(DEV,
1451 "ASSERT FAILED: disk is %s while going diskless\n",
1452 drbd_disk_str(mdev->state.disk));
1453
1454 if (ns.conn >= C_CONNECTED)
1455 drbd_send_state(mdev, ns);
1456 /* corresponding get_ldev in __drbd_set_state
1457 * this may finally trigger drbd_ldev_destroy. */
1458 put_ldev(mdev);
1459 }
1460
1461 /* Notify peer that I had a local IO error, and did not detached.. */
1462 if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT && ns.conn >= C_CONNECTED)
1463 drbd_send_state(mdev, ns);
1464
1465 /* Disks got bigger while they were detached */
1466 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
1467 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
1468 if (ns.conn == C_CONNECTED)
1469 resync_after_online_grow(mdev);
1470 }
1471
1472 /* A resync finished or aborted, wake paused devices... */
1473 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
1474 (os.peer_isp && !ns.peer_isp) ||
1475 (os.user_isp && !ns.user_isp))
1476 resume_next_sg(mdev);
1477
1478 /* sync target done with resync. Explicitly notify peer, even though
1479 * it should (at least for non-empty resyncs) already know itself. */
1480 if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
1481 drbd_send_state(mdev, ns);
1482
1483 /* Verify finished, or reached stop sector. Peer did not know about
1484 * the stop sector, and we may even have changed the stop sector during
1485 * verify to interrupt/stop early. Send the new state. */
1486 if (os.conn == C_VERIFY_S && ns.conn == C_CONNECTED
1487 && verify_can_do_stop_sector(mdev))
1488 drbd_send_state(mdev, ns);
1489
1490 /* This triggers bitmap writeout of potentially still unwritten pages
1491 * if the resync finished cleanly, or aborted because of peer disk
1492 * failure, or because of connection loss.
1493 * For resync aborted because of local disk failure, we cannot do
1494 * any bitmap writeout anymore.
1495 * No harm done if some bits change during this phase.
1496 */
1497 if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) {
1498 drbd_queue_bitmap_io(mdev, &drbd_bm_write_copy_pages, NULL,
1499 "write from resync_finished", BM_LOCKED_CHANGE_ALLOWED);
1500 put_ldev(mdev);
1501 }
1502
1503 if (ns.disk == D_DISKLESS &&
1504 ns.conn == C_STANDALONE &&
1505 ns.role == R_SECONDARY) {
1506 if (os.aftr_isp != ns.aftr_isp)
1507 resume_next_sg(mdev);
1508 }
1509
1510 drbd_md_sync(mdev);
1511 }
1512
1513 struct after_conn_state_chg_work {
1514 struct drbd_work w;
1515 enum drbd_conns oc;
1516 union drbd_state ns_min;
1517 union drbd_state ns_max; /* new, max state, over all mdevs */
1518 enum chg_state_flags flags;
1519 };
1520
1521 static int w_after_conn_state_ch(struct drbd_work *w, int unused)
1522 {
1523 struct after_conn_state_chg_work *acscw =
1524 container_of(w, struct after_conn_state_chg_work, w);
1525 struct drbd_tconn *tconn = w->tconn;
1526 enum drbd_conns oc = acscw->oc;
1527 union drbd_state ns_max = acscw->ns_max;
1528 struct drbd_conf *mdev;
1529 int vnr;
1530
1531 kfree(acscw);
1532
1533 /* Upon network configuration, we need to start the receiver */
1534 if (oc == C_STANDALONE && ns_max.conn == C_UNCONNECTED)
1535 drbd_thread_start(&tconn->receiver);
1536
1537 if (oc == C_DISCONNECTING && ns_max.conn == C_STANDALONE) {
1538 struct net_conf *old_conf;
1539
1540 mutex_lock(&tconn->conf_update);
1541 old_conf = tconn->net_conf;
1542 tconn->my_addr_len = 0;
1543 tconn->peer_addr_len = 0;
1544 rcu_assign_pointer(tconn->net_conf, NULL);
1545 conn_free_crypto(tconn);
1546 mutex_unlock(&tconn->conf_update);
1547
1548 synchronize_rcu();
1549 kfree(old_conf);
1550 }
1551
1552 if (ns_max.susp_fen) {
1553 /* case1: The outdate peer handler is successful: */
1554 if (ns_max.pdsk <= D_OUTDATED) {
1555 rcu_read_lock();
1556 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1557 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1558 drbd_uuid_new_current(mdev);
1559 clear_bit(NEW_CUR_UUID, &mdev->flags);
1560 }
1561 }
1562 rcu_read_unlock();
1563 spin_lock_irq(&tconn->req_lock);
1564 _tl_restart(tconn, CONNECTION_LOST_WHILE_PENDING);
1565 _conn_request_state(tconn,
1566 (union drbd_state) { { .susp_fen = 1 } },
1567 (union drbd_state) { { .susp_fen = 0 } },
1568 CS_VERBOSE);
1569 spin_unlock_irq(&tconn->req_lock);
1570 }
1571 }
1572 kref_put(&tconn->kref, &conn_destroy);
1573
1574 conn_md_sync(tconn);
1575
1576 return 0;
1577 }
1578
1579 void conn_old_common_state(struct drbd_tconn *tconn, union drbd_state *pcs, enum chg_state_flags *pf)
1580 {
1581 enum chg_state_flags flags = ~0;
1582 struct drbd_conf *mdev;
1583 int vnr, first_vol = 1;
1584 union drbd_dev_state os, cs = {
1585 { .role = R_SECONDARY,
1586 .peer = R_UNKNOWN,
1587 .conn = tconn->cstate,
1588 .disk = D_DISKLESS,
1589 .pdsk = D_UNKNOWN,
1590 } };
1591
1592 rcu_read_lock();
1593 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1594 os = mdev->state;
1595
1596 if (first_vol) {
1597 cs = os;
1598 first_vol = 0;
1599 continue;
1600 }
1601
1602 if (cs.role != os.role)
1603 flags &= ~CS_DC_ROLE;
1604
1605 if (cs.peer != os.peer)
1606 flags &= ~CS_DC_PEER;
1607
1608 if (cs.conn != os.conn)
1609 flags &= ~CS_DC_CONN;
1610
1611 if (cs.disk != os.disk)
1612 flags &= ~CS_DC_DISK;
1613
1614 if (cs.pdsk != os.pdsk)
1615 flags &= ~CS_DC_PDSK;
1616 }
1617 rcu_read_unlock();
1618
1619 *pf |= CS_DC_MASK;
1620 *pf &= flags;
1621 (*pcs).i = cs.i;
1622 }
1623
1624 static enum drbd_state_rv
1625 conn_is_valid_transition(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1626 enum chg_state_flags flags)
1627 {
1628 enum drbd_state_rv rv = SS_SUCCESS;
1629 union drbd_state ns, os;
1630 struct drbd_conf *mdev;
1631 int vnr;
1632
1633 rcu_read_lock();
1634 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1635 os = drbd_read_state(mdev);
1636 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
1637
1638 if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
1639 ns.disk = os.disk;
1640
1641 if (ns.i == os.i)
1642 continue;
1643
1644 rv = is_valid_transition(os, ns);
1645 if (rv < SS_SUCCESS)
1646 break;
1647
1648 if (!(flags & CS_HARD)) {
1649 rv = is_valid_state(mdev, ns);
1650 if (rv < SS_SUCCESS) {
1651 if (is_valid_state(mdev, os) == rv)
1652 rv = is_valid_soft_transition(os, ns, tconn);
1653 } else
1654 rv = is_valid_soft_transition(os, ns, tconn);
1655 }
1656 if (rv < SS_SUCCESS)
1657 break;
1658 }
1659 rcu_read_unlock();
1660
1661 if (rv < SS_SUCCESS && flags & CS_VERBOSE)
1662 print_st_err(mdev, os, ns, rv);
1663
1664 return rv;
1665 }
1666
1667 void
1668 conn_set_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1669 union drbd_state *pns_min, union drbd_state *pns_max, enum chg_state_flags flags)
1670 {
1671 union drbd_state ns, os, ns_max = { };
1672 union drbd_state ns_min = {
1673 { .role = R_MASK,
1674 .peer = R_MASK,
1675 .conn = val.conn,
1676 .disk = D_MASK,
1677 .pdsk = D_MASK
1678 } };
1679 struct drbd_conf *mdev;
1680 enum drbd_state_rv rv;
1681 int vnr, number_of_volumes = 0;
1682
1683 if (mask.conn == C_MASK) {
1684 /* remember last connect time so request_timer_fn() won't
1685 * kill newly established sessions while we are still trying to thaw
1686 * previously frozen IO */
1687 if (tconn->cstate != C_WF_REPORT_PARAMS && val.conn == C_WF_REPORT_PARAMS)
1688 tconn->last_reconnect_jif = jiffies;
1689
1690 tconn->cstate = val.conn;
1691 }
1692
1693 rcu_read_lock();
1694 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1695 number_of_volumes++;
1696 os = drbd_read_state(mdev);
1697 ns = apply_mask_val(os, mask, val);
1698 ns = sanitize_state(mdev, ns, NULL);
1699
1700 if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
1701 ns.disk = os.disk;
1702
1703 rv = __drbd_set_state(mdev, ns, flags, NULL);
1704 if (rv < SS_SUCCESS)
1705 BUG();
1706
1707 ns.i = mdev->state.i;
1708 ns_max.role = max_role(ns.role, ns_max.role);
1709 ns_max.peer = max_role(ns.peer, ns_max.peer);
1710 ns_max.conn = max_t(enum drbd_conns, ns.conn, ns_max.conn);
1711 ns_max.disk = max_t(enum drbd_disk_state, ns.disk, ns_max.disk);
1712 ns_max.pdsk = max_t(enum drbd_disk_state, ns.pdsk, ns_max.pdsk);
1713
1714 ns_min.role = min_role(ns.role, ns_min.role);
1715 ns_min.peer = min_role(ns.peer, ns_min.peer);
1716 ns_min.conn = min_t(enum drbd_conns, ns.conn, ns_min.conn);
1717 ns_min.disk = min_t(enum drbd_disk_state, ns.disk, ns_min.disk);
1718 ns_min.pdsk = min_t(enum drbd_disk_state, ns.pdsk, ns_min.pdsk);
1719 }
1720 rcu_read_unlock();
1721
1722 if (number_of_volumes == 0) {
1723 ns_min = ns_max = (union drbd_state) { {
1724 .role = R_SECONDARY,
1725 .peer = R_UNKNOWN,
1726 .conn = val.conn,
1727 .disk = D_DISKLESS,
1728 .pdsk = D_UNKNOWN
1729 } };
1730 }
1731
1732 ns_min.susp = ns_max.susp = tconn->susp;
1733 ns_min.susp_nod = ns_max.susp_nod = tconn->susp_nod;
1734 ns_min.susp_fen = ns_max.susp_fen = tconn->susp_fen;
1735
1736 *pns_min = ns_min;
1737 *pns_max = ns_max;
1738 }
1739
1740 static enum drbd_state_rv
1741 _conn_rq_cond(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val)
1742 {
1743 enum drbd_state_rv rv;
1744
1745 if (test_and_clear_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags))
1746 return SS_CW_SUCCESS;
1747
1748 if (test_and_clear_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags))
1749 return SS_CW_FAILED_BY_PEER;
1750
1751 rv = tconn->cstate != C_WF_REPORT_PARAMS ? SS_CW_NO_NEED : SS_UNKNOWN_ERROR;
1752
1753 if (rv == SS_UNKNOWN_ERROR)
1754 rv = conn_is_valid_transition(tconn, mask, val, 0);
1755
1756 if (rv == SS_SUCCESS)
1757 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
1758
1759 return rv;
1760 }
1761
1762 enum drbd_state_rv
1763 _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1764 enum chg_state_flags flags)
1765 {
1766 enum drbd_state_rv rv = SS_SUCCESS;
1767 struct after_conn_state_chg_work *acscw;
1768 enum drbd_conns oc = tconn->cstate;
1769 union drbd_state ns_max, ns_min, os;
1770 bool have_mutex = false;
1771
1772 if (mask.conn) {
1773 rv = is_valid_conn_transition(oc, val.conn);
1774 if (rv < SS_SUCCESS)
1775 goto abort;
1776 }
1777
1778 rv = conn_is_valid_transition(tconn, mask, val, flags);
1779 if (rv < SS_SUCCESS)
1780 goto abort;
1781
1782 if (oc == C_WF_REPORT_PARAMS && val.conn == C_DISCONNECTING &&
1783 !(flags & (CS_LOCAL_ONLY | CS_HARD))) {
1784
1785 /* This will be a cluster-wide state change.
1786 * Need to give up the spinlock, grab the mutex,
1787 * then send the state change request, ... */
1788 spin_unlock_irq(&tconn->req_lock);
1789 mutex_lock(&tconn->cstate_mutex);
1790 have_mutex = true;
1791
1792 set_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
1793 if (conn_send_state_req(tconn, mask, val)) {
1794 /* sending failed. */
1795 clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
1796 rv = SS_CW_FAILED_BY_PEER;
1797 /* need to re-aquire the spin lock, though */
1798 goto abort_unlocked;
1799 }
1800
1801 if (val.conn == C_DISCONNECTING)
1802 set_bit(DISCONNECT_SENT, &tconn->flags);
1803
1804 /* ... and re-aquire the spinlock.
1805 * If _conn_rq_cond() returned >= SS_SUCCESS, we must call
1806 * conn_set_state() within the same spinlock. */
1807 spin_lock_irq(&tconn->req_lock);
1808 wait_event_lock_irq(tconn->ping_wait,
1809 (rv = _conn_rq_cond(tconn, mask, val)),
1810 tconn->req_lock);
1811 clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
1812 if (rv < SS_SUCCESS)
1813 goto abort;
1814 }
1815
1816 conn_old_common_state(tconn, &os, &flags);
1817 flags |= CS_DC_SUSP;
1818 conn_set_state(tconn, mask, val, &ns_min, &ns_max, flags);
1819 conn_pr_state_change(tconn, os, ns_max, flags);
1820
1821 acscw = kmalloc(sizeof(*acscw), GFP_ATOMIC);
1822 if (acscw) {
1823 acscw->oc = os.conn;
1824 acscw->ns_min = ns_min;
1825 acscw->ns_max = ns_max;
1826 acscw->flags = flags;
1827 acscw->w.cb = w_after_conn_state_ch;
1828 kref_get(&tconn->kref);
1829 acscw->w.tconn = tconn;
1830 drbd_queue_work(&tconn->sender_work, &acscw->w);
1831 } else {
1832 conn_err(tconn, "Could not kmalloc an acscw\n");
1833 }
1834
1835 abort:
1836 if (have_mutex) {
1837 /* mutex_unlock() "... must not be used in interrupt context.",
1838 * so give up the spinlock, then re-aquire it */
1839 spin_unlock_irq(&tconn->req_lock);
1840 abort_unlocked:
1841 mutex_unlock(&tconn->cstate_mutex);
1842 spin_lock_irq(&tconn->req_lock);
1843 }
1844 if (rv < SS_SUCCESS && flags & CS_VERBOSE) {
1845 conn_err(tconn, "State change failed: %s\n", drbd_set_st_err_str(rv));
1846 conn_err(tconn, " mask = 0x%x val = 0x%x\n", mask.i, val.i);
1847 conn_err(tconn, " old_conn:%s wanted_conn:%s\n", drbd_conn_str(oc), drbd_conn_str(val.conn));
1848 }
1849 return rv;
1850 }
1851
1852 enum drbd_state_rv
1853 conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1854 enum chg_state_flags flags)
1855 {
1856 enum drbd_state_rv rv;
1857
1858 spin_lock_irq(&tconn->req_lock);
1859 rv = _conn_request_state(tconn, mask, val, flags);
1860 spin_unlock_irq(&tconn->req_lock);
1861
1862 return rv;
1863 }
Linux kernel - Deliverables
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