4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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>.
10 Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev
11 from Logicworks, Inc. for making SDP replication support possible.
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)
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.
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.
28 #include <linux/drbd_limits.h>
32 struct after_state_chg_work {
36 enum chg_state_flags flags;
37 struct completion *done;
40 static int w_after_state_ch(struct drbd_work *w, int unused);
41 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
42 union drbd_state ns, enum chg_state_flags flags);
43 static void after_all_state_ch(struct drbd_tconn *tconn);
44 static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state);
45 static enum drbd_state_rv is_valid_soft_transition(union drbd_state, union drbd_state);
46 static enum drbd_state_rv is_valid_transition(union drbd_state os, union drbd_state ns);
47 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns,
48 const char **warn_sync_abort);
50 static inline bool is_susp(union drbd_state s)
52 return s.susp || s.susp_nod || s.susp_fen;
55 bool conn_all_vols_unconf(struct drbd_tconn *tconn)
57 struct drbd_conf *mdev;
62 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
63 if (mdev->state.disk != D_DISKLESS ||
64 mdev->state.conn != C_STANDALONE ||
65 mdev->state.role != R_SECONDARY) {
75 /* Unfortunately the states where not correctly ordered, when
76 they where defined. therefore can not use max_t() here. */
77 static enum drbd_role max_role(enum drbd_role role1, enum drbd_role role2)
79 if (role1 == R_PRIMARY || role2 == R_PRIMARY)
81 if (role1 == R_SECONDARY || role2 == R_SECONDARY)
85 static enum drbd_role min_role(enum drbd_role role1, enum drbd_role role2)
87 if (role1 == R_UNKNOWN || role2 == R_UNKNOWN)
89 if (role1 == R_SECONDARY || role2 == R_SECONDARY)
94 enum drbd_role conn_highest_role(struct drbd_tconn *tconn)
96 enum drbd_role role = R_UNKNOWN;
97 struct drbd_conf *mdev;
101 idr_for_each_entry(&tconn->volumes, mdev, vnr)
102 role = max_role(role, mdev->state.role);
108 enum drbd_role conn_highest_peer(struct drbd_tconn *tconn)
110 enum drbd_role peer = R_UNKNOWN;
111 struct drbd_conf *mdev;
115 idr_for_each_entry(&tconn->volumes, mdev, vnr)
116 peer = max_role(peer, mdev->state.peer);
122 enum drbd_disk_state conn_highest_disk(struct drbd_tconn *tconn)
124 enum drbd_disk_state ds = D_DISKLESS;
125 struct drbd_conf *mdev;
129 idr_for_each_entry(&tconn->volumes, mdev, vnr)
130 ds = max_t(enum drbd_disk_state, ds, mdev->state.disk);
136 enum drbd_disk_state conn_lowest_disk(struct drbd_tconn *tconn)
138 enum drbd_disk_state ds = D_MASK;
139 struct drbd_conf *mdev;
143 idr_for_each_entry(&tconn->volumes, mdev, vnr)
144 ds = min_t(enum drbd_disk_state, ds, mdev->state.disk);
150 enum drbd_disk_state conn_highest_pdsk(struct drbd_tconn *tconn)
152 enum drbd_disk_state ds = D_DISKLESS;
153 struct drbd_conf *mdev;
157 idr_for_each_entry(&tconn->volumes, mdev, vnr)
158 ds = max_t(enum drbd_disk_state, ds, mdev->state.pdsk);
164 enum drbd_conns conn_lowest_conn(struct drbd_tconn *tconn)
166 enum drbd_conns conn = C_MASK;
167 struct drbd_conf *mdev;
171 idr_for_each_entry(&tconn->volumes, mdev, vnr)
172 conn = min_t(enum drbd_conns, conn, mdev->state.conn);
179 * cl_wide_st_chg() - true if the state change is a cluster wide one
180 * @mdev: DRBD device.
181 * @os: old (current) state.
182 * @ns: new (wanted) state.
184 static int cl_wide_st_chg(struct drbd_conf *mdev,
185 union drbd_state os, union drbd_state ns)
187 return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED &&
188 ((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
189 (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
190 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
191 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) ||
192 (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
193 (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S);
196 static union drbd_state
197 apply_mask_val(union drbd_state os, union drbd_state mask, union drbd_state val)
200 ns.i = (os.i & ~mask.i) | val.i;
205 drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
206 union drbd_state mask, union drbd_state val)
210 enum drbd_state_rv rv;
212 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
213 ns = apply_mask_val(drbd_read_state(mdev), mask, val);
214 rv = _drbd_set_state(mdev, ns, f, NULL);
215 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
221 * drbd_force_state() - Impose a change which happens outside our control on our state
222 * @mdev: DRBD device.
223 * @mask: mask of state bits to change.
224 * @val: value of new state bits.
226 void drbd_force_state(struct drbd_conf *mdev,
227 union drbd_state mask, union drbd_state val)
229 drbd_change_state(mdev, CS_HARD, mask, val);
232 static enum drbd_state_rv
233 _req_st_cond(struct drbd_conf *mdev, union drbd_state mask,
234 union drbd_state val)
236 union drbd_state os, ns;
238 enum drbd_state_rv rv;
240 if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
241 return SS_CW_SUCCESS;
243 if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
244 return SS_CW_FAILED_BY_PEER;
246 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
247 os = drbd_read_state(mdev);
248 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
249 rv = is_valid_transition(os, ns);
250 if (rv == SS_SUCCESS)
251 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
253 if (!cl_wide_st_chg(mdev, os, ns))
255 if (rv == SS_UNKNOWN_ERROR) {
256 rv = is_valid_state(mdev, ns);
257 if (rv == SS_SUCCESS) {
258 rv = is_valid_soft_transition(os, ns);
259 if (rv == SS_SUCCESS)
260 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
263 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
269 * drbd_req_state() - Perform an eventually cluster wide state change
270 * @mdev: DRBD device.
271 * @mask: mask of state bits to change.
272 * @val: value of new state bits.
275 * Should not be called directly, use drbd_request_state() or
276 * _drbd_request_state().
278 static enum drbd_state_rv
279 drbd_req_state(struct drbd_conf *mdev, union drbd_state mask,
280 union drbd_state val, enum chg_state_flags f)
282 struct completion done;
284 union drbd_state os, ns;
285 enum drbd_state_rv rv;
287 init_completion(&done);
289 if (f & CS_SERIALIZE)
290 mutex_lock(mdev->state_mutex);
292 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
293 os = drbd_read_state(mdev);
294 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
295 rv = is_valid_transition(os, ns);
296 if (rv < SS_SUCCESS) {
297 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
301 if (cl_wide_st_chg(mdev, os, ns)) {
302 rv = is_valid_state(mdev, ns);
303 if (rv == SS_SUCCESS)
304 rv = is_valid_soft_transition(os, ns);
305 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
307 if (rv < SS_SUCCESS) {
309 print_st_err(mdev, os, ns, rv);
313 if (drbd_send_state_req(mdev, mask, val)) {
314 rv = SS_CW_FAILED_BY_PEER;
316 print_st_err(mdev, os, ns, rv);
320 wait_event(mdev->state_wait,
321 (rv = _req_st_cond(mdev, mask, val)));
323 if (rv < SS_SUCCESS) {
325 print_st_err(mdev, os, ns, rv);
328 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
329 ns = apply_mask_val(drbd_read_state(mdev), mask, val);
330 rv = _drbd_set_state(mdev, ns, f, &done);
332 rv = _drbd_set_state(mdev, ns, f, &done);
335 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
337 if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
338 D_ASSERT(current != mdev->tconn->worker.task);
339 wait_for_completion(&done);
343 if (f & CS_SERIALIZE)
344 mutex_unlock(mdev->state_mutex);
350 * _drbd_request_state() - Request a state change (with flags)
351 * @mdev: DRBD device.
352 * @mask: mask of state bits to change.
353 * @val: value of new state bits.
356 * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE
357 * flag, or when logging of failed state change requests is not desired.
360 _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask,
361 union drbd_state val, enum chg_state_flags f)
363 enum drbd_state_rv rv;
365 wait_event(mdev->state_wait,
366 (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE);
371 static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns)
373 dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c%c%c }\n",
375 drbd_conn_str(ns.conn),
376 drbd_role_str(ns.role),
377 drbd_role_str(ns.peer),
378 drbd_disk_str(ns.disk),
379 drbd_disk_str(ns.pdsk),
380 is_susp(ns) ? 's' : 'r',
381 ns.aftr_isp ? 'a' : '-',
382 ns.peer_isp ? 'p' : '-',
383 ns.user_isp ? 'u' : '-',
384 ns.susp_fen ? 'F' : '-',
385 ns.susp_nod ? 'N' : '-'
389 void print_st_err(struct drbd_conf *mdev, union drbd_state os,
390 union drbd_state ns, enum drbd_state_rv err)
392 if (err == SS_IN_TRANSIENT_STATE)
394 dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err));
395 print_st(mdev, " state", os);
396 print_st(mdev, "wanted", ns);
399 static long print_state_change(char *pb, union drbd_state os, union drbd_state ns,
400 enum chg_state_flags flags)
406 if (ns.role != os.role && flags & CS_DC_ROLE)
407 pbp += sprintf(pbp, "role( %s -> %s ) ",
408 drbd_role_str(os.role),
409 drbd_role_str(ns.role));
410 if (ns.peer != os.peer && flags & CS_DC_PEER)
411 pbp += sprintf(pbp, "peer( %s -> %s ) ",
412 drbd_role_str(os.peer),
413 drbd_role_str(ns.peer));
414 if (ns.conn != os.conn && flags & CS_DC_CONN)
415 pbp += sprintf(pbp, "conn( %s -> %s ) ",
416 drbd_conn_str(os.conn),
417 drbd_conn_str(ns.conn));
418 if (ns.disk != os.disk && flags & CS_DC_DISK)
419 pbp += sprintf(pbp, "disk( %s -> %s ) ",
420 drbd_disk_str(os.disk),
421 drbd_disk_str(ns.disk));
422 if (ns.pdsk != os.pdsk && flags & CS_DC_PDSK)
423 pbp += sprintf(pbp, "pdsk( %s -> %s ) ",
424 drbd_disk_str(os.pdsk),
425 drbd_disk_str(ns.pdsk));
430 static void drbd_pr_state_change(struct drbd_conf *mdev, union drbd_state os, union drbd_state ns,
431 enum chg_state_flags flags)
436 pbp += print_state_change(pbp, os, ns, flags ^ CS_DC_MASK);
438 if (ns.aftr_isp != os.aftr_isp)
439 pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ",
442 if (ns.peer_isp != os.peer_isp)
443 pbp += sprintf(pbp, "peer_isp( %d -> %d ) ",
446 if (ns.user_isp != os.user_isp)
447 pbp += sprintf(pbp, "user_isp( %d -> %d ) ",
452 dev_info(DEV, "%s\n", pb);
455 static void conn_pr_state_change(struct drbd_tconn *tconn, union drbd_state os, union drbd_state ns,
456 enum chg_state_flags flags)
461 pbp += print_state_change(pbp, os, ns, flags);
463 if (is_susp(ns) != is_susp(os) && flags & CS_DC_SUSP)
464 pbp += sprintf(pbp, "susp( %d -> %d ) ",
469 conn_info(tconn, "%s\n", pb);
474 * is_valid_state() - Returns an SS_ error code if ns is not valid
475 * @mdev: DRBD device.
476 * @ns: State to consider.
478 static enum drbd_state_rv
479 is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
481 /* See drbd_state_sw_errors in drbd_strings.c */
483 enum drbd_fencing_p fp;
484 enum drbd_state_rv rv = SS_SUCCESS;
488 if (get_ldev(mdev)) {
489 fp = mdev->ldev->dc.fencing;
494 nc = rcu_dereference(mdev->tconn->net_conf);
496 if (!nc->two_primaries && ns.role == R_PRIMARY) {
497 if (ns.peer == R_PRIMARY)
498 rv = SS_TWO_PRIMARIES;
499 else if (conn_highest_peer(mdev->tconn) == R_PRIMARY)
500 rv = SS_O_VOL_PEER_PRI;
505 /* already found a reason to abort */;
506 else if (ns.role == R_SECONDARY && mdev->open_cnt)
507 rv = SS_DEVICE_IN_USE;
509 else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE)
510 rv = SS_NO_UP_TO_DATE_DISK;
512 else if (fp >= FP_RESOURCE &&
513 ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN)
516 else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT)
517 rv = SS_NO_UP_TO_DATE_DISK;
519 else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT)
520 rv = SS_NO_LOCAL_DISK;
522 else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT)
523 rv = SS_NO_REMOTE_DISK;
525 else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)
526 rv = SS_NO_UP_TO_DATE_DISK;
528 else if ((ns.conn == C_CONNECTED ||
529 ns.conn == C_WF_BITMAP_S ||
530 ns.conn == C_SYNC_SOURCE ||
531 ns.conn == C_PAUSED_SYNC_S) &&
532 ns.disk == D_OUTDATED)
533 rv = SS_CONNECTED_OUTDATES;
535 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
536 (nc->verify_alg[0] == 0))
537 rv = SS_NO_VERIFY_ALG;
539 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
540 mdev->tconn->agreed_pro_version < 88)
541 rv = SS_NOT_SUPPORTED;
543 else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN)
544 rv = SS_CONNECTED_OUTDATES;
552 * is_valid_soft_transition() - Returns an SS_ error code if the state transition is not possible
553 * This function limits state transitions that may be declined by DRBD. I.e.
554 * user requests (aka soft transitions).
555 * @mdev: DRBD device.
559 static enum drbd_state_rv
560 is_valid_soft_transition(union drbd_state os, union drbd_state ns)
562 enum drbd_state_rv rv = SS_SUCCESS;
564 if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) &&
565 os.conn > C_CONNECTED)
566 rv = SS_RESYNC_RUNNING;
568 if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE)
569 rv = SS_ALREADY_STANDALONE;
571 if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS)
574 if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED)
575 rv = SS_NO_NET_CONFIG;
577 if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING)
578 rv = SS_LOWER_THAN_OUTDATED;
580 if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
581 rv = SS_IN_TRANSIENT_STATE;
583 /* if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
584 rv = SS_IN_TRANSIENT_STATE; */
586 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
587 rv = SS_NEED_CONNECTION;
589 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
590 ns.conn != os.conn && os.conn > C_CONNECTED)
591 rv = SS_RESYNC_RUNNING;
593 if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) &&
594 os.conn < C_CONNECTED)
595 rv = SS_NEED_CONNECTION;
597 if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)
598 && os.conn < C_WF_REPORT_PARAMS)
599 rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */
604 static enum drbd_state_rv
605 is_valid_conn_transition(enum drbd_conns oc, enum drbd_conns nc)
607 enum drbd_state_rv rv = SS_SUCCESS;
609 /* Disallow Network errors to configure a device's network part */
610 if ((nc >= C_TIMEOUT && nc <= C_TEAR_DOWN) && oc <= C_DISCONNECTING)
611 rv = SS_NEED_CONNECTION;
613 /* After a network error only C_UNCONNECTED or C_DISCONNECTING may follow. */
614 if (oc >= C_TIMEOUT && oc <= C_TEAR_DOWN && nc != C_UNCONNECTED && nc != C_DISCONNECTING)
615 rv = SS_IN_TRANSIENT_STATE;
617 /* After C_DISCONNECTING only C_STANDALONE may follow */
618 if (oc == C_DISCONNECTING && nc != C_STANDALONE)
619 rv = SS_IN_TRANSIENT_STATE;
626 * is_valid_transition() - Returns an SS_ error code if the state transition is not possible
627 * This limits hard state transitions. Hard state transitions are facts there are
628 * imposed on DRBD by the environment. E.g. disk broke or network broke down.
629 * But those hard state transitions are still not allowed to do everything.
633 static enum drbd_state_rv
634 is_valid_transition(union drbd_state os, union drbd_state ns)
636 enum drbd_state_rv rv;
638 rv = is_valid_conn_transition(os.conn, ns.conn);
640 /* we cannot fail (again) if we already detached */
641 if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
644 /* if we are only D_ATTACHING yet,
645 * we can (and should) go directly to D_DISKLESS. */
646 if (ns.disk == D_FAILED && os.disk == D_ATTACHING) {
647 printk("TODO: FIX ME\n");
655 * sanitize_state() - Resolves implicitly necessary additional changes to a state transition
656 * @mdev: DRBD device.
661 * When we loose connection, we have to set the state of the peers disk (pdsk)
662 * to D_UNKNOWN. This rule and many more along those lines are in this function.
664 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns,
665 const char **warn_sync_abort)
667 enum drbd_fencing_p fp;
668 enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max;
671 if (get_ldev(mdev)) {
672 fp = mdev->ldev->dc.fencing;
676 /* Implications from connection to peer and peer_isp */
677 if (ns.conn < C_CONNECTED) {
680 if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT)
684 /* Clear the aftr_isp when becoming unconfigured */
685 if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY)
688 /* An implication of the disk states onto the connection state */
689 /* Abort resync if a disk fails/detaches */
690 if (ns.conn > C_CONNECTED && (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
693 ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T ?
694 "Online-verify" : "Resync";
695 ns.conn = C_CONNECTED;
698 /* Connection breaks down before we finished "Negotiating" */
699 if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING &&
700 get_ldev_if_state(mdev, D_NEGOTIATING)) {
701 if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) {
702 ns.disk = mdev->new_state_tmp.disk;
703 ns.pdsk = mdev->new_state_tmp.pdsk;
705 dev_alert(DEV, "Connection lost while negotiating, no data!\n");
706 ns.disk = D_DISKLESS;
712 /* D_CONSISTENT and D_OUTDATED vanish when we get connected */
713 if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) {
714 if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED)
715 ns.disk = D_UP_TO_DATE;
716 if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)
717 ns.pdsk = D_UP_TO_DATE;
720 /* Implications of the connection stat on the disk states */
721 disk_min = D_DISKLESS;
722 disk_max = D_UP_TO_DATE;
723 pdsk_min = D_INCONSISTENT;
724 pdsk_max = D_UNKNOWN;
725 switch ((enum drbd_conns)ns.conn) {
727 case C_PAUSED_SYNC_T:
728 case C_STARTING_SYNC_T:
731 disk_min = D_INCONSISTENT;
732 disk_max = D_OUTDATED;
733 pdsk_min = D_UP_TO_DATE;
734 pdsk_max = D_UP_TO_DATE;
738 disk_min = D_UP_TO_DATE;
739 disk_max = D_UP_TO_DATE;
740 pdsk_min = D_UP_TO_DATE;
741 pdsk_max = D_UP_TO_DATE;
744 disk_min = D_DISKLESS;
745 disk_max = D_UP_TO_DATE;
746 pdsk_min = D_DISKLESS;
747 pdsk_max = D_UP_TO_DATE;
750 case C_PAUSED_SYNC_S:
751 case C_STARTING_SYNC_S:
753 disk_min = D_UP_TO_DATE;
754 disk_max = D_UP_TO_DATE;
755 pdsk_min = D_INCONSISTENT;
756 pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/
759 disk_min = D_INCONSISTENT;
760 disk_max = D_INCONSISTENT;
761 pdsk_min = D_UP_TO_DATE;
762 pdsk_max = D_UP_TO_DATE;
765 disk_min = D_UP_TO_DATE;
766 disk_max = D_UP_TO_DATE;
767 pdsk_min = D_INCONSISTENT;
768 pdsk_max = D_INCONSISTENT;
771 case C_DISCONNECTING:
775 case C_NETWORK_FAILURE:
776 case C_PROTOCOL_ERROR:
778 case C_WF_CONNECTION:
779 case C_WF_REPORT_PARAMS:
783 if (ns.disk > disk_max)
786 if (ns.disk < disk_min) {
787 dev_warn(DEV, "Implicitly set disk from %s to %s\n",
788 drbd_disk_str(ns.disk), drbd_disk_str(disk_min));
791 if (ns.pdsk > pdsk_max)
794 if (ns.pdsk < pdsk_min) {
795 dev_warn(DEV, "Implicitly set pdsk from %s to %s\n",
796 drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min));
800 if (fp == FP_STONITH &&
801 (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED))
802 ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */
804 if (mdev->tconn->res_opts.on_no_data == OND_SUSPEND_IO &&
805 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
806 ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */
808 if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
809 if (ns.conn == C_SYNC_SOURCE)
810 ns.conn = C_PAUSED_SYNC_S;
811 if (ns.conn == C_SYNC_TARGET)
812 ns.conn = C_PAUSED_SYNC_T;
814 if (ns.conn == C_PAUSED_SYNC_S)
815 ns.conn = C_SYNC_SOURCE;
816 if (ns.conn == C_PAUSED_SYNC_T)
817 ns.conn = C_SYNC_TARGET;
823 void drbd_resume_al(struct drbd_conf *mdev)
825 if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
826 dev_info(DEV, "Resumed AL updates\n");
829 /* helper for __drbd_set_state */
830 static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
832 if (mdev->tconn->agreed_pro_version < 90)
833 mdev->ov_start_sector = 0;
834 mdev->rs_total = drbd_bm_bits(mdev);
835 mdev->ov_position = 0;
836 if (cs == C_VERIFY_T) {
837 /* starting online verify from an arbitrary position
838 * does not fit well into the existing protocol.
839 * on C_VERIFY_T, we initialize ov_left and friends
840 * implicitly in receive_DataRequest once the
841 * first P_OV_REQUEST is received */
842 mdev->ov_start_sector = ~(sector_t)0;
844 unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector);
845 if (bit >= mdev->rs_total) {
846 mdev->ov_start_sector =
847 BM_BIT_TO_SECT(mdev->rs_total - 1);
850 mdev->rs_total -= bit;
851 mdev->ov_position = mdev->ov_start_sector;
853 mdev->ov_left = mdev->rs_total;
857 * __drbd_set_state() - Set a new DRBD state
858 * @mdev: DRBD device.
861 * @done: Optional completion, that will get completed after the after_state_ch() finished
863 * Caller needs to hold req_lock, and global_state_lock. Do not call directly.
866 __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
867 enum chg_state_flags flags, struct completion *done)
870 enum drbd_state_rv rv = SS_SUCCESS;
871 const char *warn_sync_abort = NULL;
872 struct after_state_chg_work *ascw;
874 os = drbd_read_state(mdev);
876 ns = sanitize_state(mdev, ns, &warn_sync_abort);
878 return SS_NOTHING_TO_DO;
880 rv = is_valid_transition(os, ns);
884 if (!(flags & CS_HARD)) {
885 /* pre-state-change checks ; only look at ns */
886 /* See drbd_state_sw_errors in drbd_strings.c */
888 rv = is_valid_state(mdev, ns);
889 if (rv < SS_SUCCESS) {
890 /* If the old state was illegal as well, then let
893 if (is_valid_state(mdev, os) == rv)
894 rv = is_valid_soft_transition(os, ns);
896 rv = is_valid_soft_transition(os, ns);
899 if (rv < SS_SUCCESS) {
900 if (flags & CS_VERBOSE)
901 print_st_err(mdev, os, ns, rv);
906 dev_warn(DEV, "%s aborted.\n", warn_sync_abort);
908 drbd_pr_state_change(mdev, os, ns, flags);
910 /* Display changes to the susp* flags that where caused by the call to
911 sanitize_state(). Only display it here if we where not called from
912 _conn_request_state() */
913 if (!(flags & CS_DC_SUSP))
914 conn_pr_state_change(mdev->tconn, os, ns, (flags & ~CS_DC_MASK) | CS_DC_SUSP);
916 /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
917 * on the ldev here, to be sure the transition -> D_DISKLESS resp.
918 * drbd_ldev_destroy() won't happen before our corresponding
919 * after_state_ch works run, where we put_ldev again. */
920 if ((os.disk != D_FAILED && ns.disk == D_FAILED) ||
921 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))
922 atomic_inc(&mdev->local_cnt);
924 mdev->state.i = ns.i;
925 mdev->tconn->susp = ns.susp;
926 mdev->tconn->susp_nod = ns.susp_nod;
927 mdev->tconn->susp_fen = ns.susp_fen;
929 if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING)
930 drbd_print_uuids(mdev, "attached to UUIDs");
932 wake_up(&mdev->misc_wait);
933 wake_up(&mdev->state_wait);
934 wake_up(&mdev->tconn->ping_wait);
936 /* aborted verify run. log the last position */
937 if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
938 ns.conn < C_CONNECTED) {
939 mdev->ov_start_sector =
940 BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left);
941 dev_info(DEV, "Online Verify reached sector %llu\n",
942 (unsigned long long)mdev->ov_start_sector);
945 if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
946 (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
947 dev_info(DEV, "Syncer continues.\n");
948 mdev->rs_paused += (long)jiffies
949 -(long)mdev->rs_mark_time[mdev->rs_last_mark];
950 if (ns.conn == C_SYNC_TARGET)
951 mod_timer(&mdev->resync_timer, jiffies);
954 if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
955 (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
956 dev_info(DEV, "Resync suspended\n");
957 mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
960 if (os.conn == C_CONNECTED &&
961 (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
962 unsigned long now = jiffies;
965 set_ov_position(mdev, ns.conn);
966 mdev->rs_start = now;
967 mdev->rs_last_events = 0;
968 mdev->rs_last_sect_ev = 0;
969 mdev->ov_last_oos_size = 0;
970 mdev->ov_last_oos_start = 0;
972 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
973 mdev->rs_mark_left[i] = mdev->ov_left;
974 mdev->rs_mark_time[i] = now;
977 drbd_rs_controller_reset(mdev);
979 if (ns.conn == C_VERIFY_S) {
980 dev_info(DEV, "Starting Online Verify from sector %llu\n",
981 (unsigned long long)mdev->ov_position);
982 mod_timer(&mdev->resync_timer, jiffies);
986 if (get_ldev(mdev)) {
987 u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
988 MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
989 MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
991 if (test_bit(CRASHED_PRIMARY, &mdev->flags))
992 mdf |= MDF_CRASHED_PRIMARY;
993 if (mdev->state.role == R_PRIMARY ||
994 (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
995 mdf |= MDF_PRIMARY_IND;
996 if (mdev->state.conn > C_WF_REPORT_PARAMS)
997 mdf |= MDF_CONNECTED_IND;
998 if (mdev->state.disk > D_INCONSISTENT)
999 mdf |= MDF_CONSISTENT;
1000 if (mdev->state.disk > D_OUTDATED)
1001 mdf |= MDF_WAS_UP_TO_DATE;
1002 if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
1003 mdf |= MDF_PEER_OUT_DATED;
1004 if (mdf != mdev->ldev->md.flags) {
1005 mdev->ldev->md.flags = mdf;
1006 drbd_md_mark_dirty(mdev);
1008 if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
1009 drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
1013 /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
1014 if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
1015 os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
1016 set_bit(CONSIDER_RESYNC, &mdev->flags);
1018 /* Receiver should clean up itself */
1019 if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
1020 drbd_thread_stop_nowait(&mdev->tconn->receiver);
1022 /* Now the receiver finished cleaning up itself, it should die */
1023 if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
1024 drbd_thread_stop_nowait(&mdev->tconn->receiver);
1026 /* Upon network failure, we need to restart the receiver. */
1027 if (os.conn > C_TEAR_DOWN &&
1028 ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
1029 drbd_thread_restart_nowait(&mdev->tconn->receiver);
1031 /* Resume AL writing if we get a connection */
1032 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1033 drbd_resume_al(mdev);
1035 ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
1039 ascw->flags = flags;
1040 ascw->w.cb = w_after_state_ch;
1041 ascw->w.mdev = mdev;
1043 drbd_queue_work(&mdev->tconn->data.work, &ascw->w);
1045 dev_err(DEV, "Could not kmalloc an ascw\n");
1051 static int w_after_state_ch(struct drbd_work *w, int unused)
1053 struct after_state_chg_work *ascw =
1054 container_of(w, struct after_state_chg_work, w);
1055 struct drbd_conf *mdev = w->mdev;
1057 after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
1058 if (ascw->flags & CS_WAIT_COMPLETE) {
1059 D_ASSERT(ascw->done != NULL);
1060 complete(ascw->done);
1067 static void abw_start_sync(struct drbd_conf *mdev, int rv)
1070 dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
1071 _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
1075 switch (mdev->state.conn) {
1076 case C_STARTING_SYNC_T:
1077 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
1079 case C_STARTING_SYNC_S:
1080 drbd_start_resync(mdev, C_SYNC_SOURCE);
1085 int drbd_bitmap_io_from_worker(struct drbd_conf *mdev,
1086 int (*io_fn)(struct drbd_conf *),
1087 char *why, enum bm_flag flags)
1091 D_ASSERT(current == mdev->tconn->worker.task);
1093 /* open coded non-blocking drbd_suspend_io(mdev); */
1094 set_bit(SUSPEND_IO, &mdev->flags);
1096 drbd_bm_lock(mdev, why, flags);
1098 drbd_bm_unlock(mdev);
1100 drbd_resume_io(mdev);
1106 * after_state_ch() - Perform after state change actions that may sleep
1107 * @mdev: DRBD device.
1112 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
1113 union drbd_state ns, enum chg_state_flags flags)
1115 enum drbd_fencing_p fp;
1116 struct sib_info sib;
1118 sib.sib_reason = SIB_STATE_CHANGE;
1122 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
1123 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1125 mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
1129 if (get_ldev(mdev)) {
1130 fp = mdev->ldev->dc.fencing;
1134 /* Inform userspace about the change... */
1135 drbd_bcast_event(mdev, &sib);
1137 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
1138 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
1139 drbd_khelper(mdev, "pri-on-incon-degr");
1141 /* Here we have the actions that are performed after a
1142 state change. This function might sleep */
1145 enum drbd_req_event what = NOTHING;
1147 if (os.conn < C_CONNECTED && conn_lowest_conn(mdev->tconn) >= C_CONNECTED)
1150 if (os.disk == D_ATTACHING && conn_lowest_disk(mdev->tconn) > D_ATTACHING)
1151 what = RESTART_FROZEN_DISK_IO;
1153 if (what != NOTHING) {
1154 spin_lock_irq(&mdev->tconn->req_lock);
1155 _tl_restart(mdev->tconn, what);
1156 _drbd_set_state(_NS(mdev, susp_nod, 0), CS_VERBOSE, NULL);
1157 spin_unlock_irq(&mdev->tconn->req_lock);
1161 /* Became sync source. With protocol >= 96, we still need to send out
1162 * the sync uuid now. Need to do that before any drbd_send_state, or
1163 * the other side may go "paused sync" before receiving the sync uuids,
1164 * which is unexpected. */
1165 if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) &&
1166 (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) &&
1167 mdev->tconn->agreed_pro_version >= 96 && get_ldev(mdev)) {
1168 drbd_gen_and_send_sync_uuid(mdev);
1172 /* Do not change the order of the if above and the two below... */
1173 if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */
1174 drbd_send_uuids(mdev);
1175 drbd_send_state(mdev);
1177 /* No point in queuing send_bitmap if we don't have a connection
1178 * anymore, so check also the _current_ state, not only the new state
1179 * at the time this work was queued. */
1180 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S &&
1181 mdev->state.conn == C_WF_BITMAP_S)
1182 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL,
1183 "send_bitmap (WFBitMapS)",
1184 BM_LOCKED_TEST_ALLOWED);
1186 /* Lost contact to peer's copy of the data */
1187 if ((os.pdsk >= D_INCONSISTENT &&
1188 os.pdsk != D_UNKNOWN &&
1189 os.pdsk != D_OUTDATED)
1190 && (ns.pdsk < D_INCONSISTENT ||
1191 ns.pdsk == D_UNKNOWN ||
1192 ns.pdsk == D_OUTDATED)) {
1193 if (get_ldev(mdev)) {
1194 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
1195 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1196 if (drbd_suspended(mdev)) {
1197 set_bit(NEW_CUR_UUID, &mdev->flags);
1199 drbd_uuid_new_current(mdev);
1200 drbd_send_uuids(mdev);
1207 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
1208 if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) {
1209 drbd_uuid_new_current(mdev);
1210 drbd_send_uuids(mdev);
1213 /* D_DISKLESS Peer becomes secondary */
1214 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
1215 /* We may still be Primary ourselves.
1216 * No harm done if the bitmap still changes,
1217 * redirtied pages will follow later. */
1218 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
1219 "demote diskless peer", BM_LOCKED_SET_ALLOWED);
1223 /* Write out all changed bits on demote.
1224 * Though, no need to da that just yet
1225 * if there is a resync going on still */
1226 if (os.role == R_PRIMARY && ns.role == R_SECONDARY &&
1227 mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) {
1228 /* No changes to the bitmap expected this time, so assert that,
1229 * even though no harm was done if it did change. */
1230 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
1231 "demote", BM_LOCKED_TEST_ALLOWED);
1235 /* Last part of the attaching process ... */
1236 if (ns.conn >= C_CONNECTED &&
1237 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
1238 drbd_send_sizes(mdev, 0, 0); /* to start sync... */
1239 drbd_send_uuids(mdev);
1240 drbd_send_state(mdev);
1243 /* We want to pause/continue resync, tell peer. */
1244 if (ns.conn >= C_CONNECTED &&
1245 ((os.aftr_isp != ns.aftr_isp) ||
1246 (os.user_isp != ns.user_isp)))
1247 drbd_send_state(mdev);
1249 /* In case one of the isp bits got set, suspend other devices. */
1250 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
1251 (ns.aftr_isp || ns.peer_isp || ns.user_isp))
1252 suspend_other_sg(mdev);
1254 /* Make sure the peer gets informed about eventual state
1255 changes (ISP bits) while we were in WFReportParams. */
1256 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
1257 drbd_send_state(mdev);
1259 if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
1260 drbd_send_state(mdev);
1262 /* We are in the progress to start a full sync... */
1263 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
1264 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
1265 /* no other bitmap changes expected during this phase */
1266 drbd_queue_bitmap_io(mdev,
1267 &drbd_bmio_set_n_write, &abw_start_sync,
1268 "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED);
1270 /* We are invalidating our self... */
1271 if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
1272 os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
1273 /* other bitmap operation expected during this phase */
1274 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL,
1275 "set_n_write from invalidate", BM_LOCKED_MASK);
1277 /* first half of local IO error, failure to attach,
1278 * or administrative detach */
1279 if (os.disk != D_FAILED && ns.disk == D_FAILED) {
1280 enum drbd_io_error_p eh;
1282 /* corresponding get_ldev was in __drbd_set_state, to serialize
1283 * our cleanup here with the transition to D_DISKLESS,
1284 * so it is safe to dreference ldev here. */
1285 eh = mdev->ldev->dc.on_io_error;
1286 was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
1288 /* current state still has to be D_FAILED,
1289 * there is only one way out: to D_DISKLESS,
1290 * and that may only happen after our put_ldev below. */
1291 if (mdev->state.disk != D_FAILED)
1293 "ASSERT FAILED: disk is %s during detach\n",
1294 drbd_disk_str(mdev->state.disk));
1296 if (!drbd_send_state(mdev))
1297 dev_warn(DEV, "Notified peer that I am detaching my disk\n");
1299 dev_err(DEV, "Sending state for detaching disk failed\n");
1301 drbd_rs_cancel_all(mdev);
1303 /* In case we want to get something to stable storage still,
1304 * this may be the last chance.
1305 * Following put_ldev may transition to D_DISKLESS. */
1309 if (was_io_error && eh == EP_CALL_HELPER)
1310 drbd_khelper(mdev, "local-io-error");
1313 /* second half of local IO error, failure to attach,
1314 * or administrative detach,
1315 * after local_cnt references have reached zero again */
1316 if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
1317 /* We must still be diskless,
1318 * re-attach has to be serialized with this! */
1319 if (mdev->state.disk != D_DISKLESS)
1321 "ASSERT FAILED: disk is %s while going diskless\n",
1322 drbd_disk_str(mdev->state.disk));
1325 mdev->rs_failed = 0;
1326 atomic_set(&mdev->rs_pending_cnt, 0);
1328 if (!drbd_send_state(mdev))
1329 dev_warn(DEV, "Notified peer that I'm now diskless.\n");
1330 /* corresponding get_ldev in __drbd_set_state
1331 * this may finally trigger drbd_ldev_destroy. */
1335 /* Notify peer that I had a local IO error, and did not detached.. */
1336 if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT)
1337 drbd_send_state(mdev);
1339 /* Disks got bigger while they were detached */
1340 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
1341 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
1342 if (ns.conn == C_CONNECTED)
1343 resync_after_online_grow(mdev);
1346 /* A resync finished or aborted, wake paused devices... */
1347 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
1348 (os.peer_isp && !ns.peer_isp) ||
1349 (os.user_isp && !ns.user_isp))
1350 resume_next_sg(mdev);
1352 /* sync target done with resync. Explicitly notify peer, even though
1353 * it should (at least for non-empty resyncs) already know itself. */
1354 if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
1355 drbd_send_state(mdev);
1357 /* This triggers bitmap writeout of potentially still unwritten pages
1358 * if the resync finished cleanly, or aborted because of peer disk
1359 * failure, or because of connection loss.
1360 * For resync aborted because of local disk failure, we cannot do
1361 * any bitmap writeout anymore.
1362 * No harm done if some bits change during this phase.
1364 if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) {
1365 drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL,
1366 "write from resync_finished", BM_LOCKED_SET_ALLOWED);
1370 if (ns.disk == D_DISKLESS &&
1371 ns.conn == C_STANDALONE &&
1372 ns.role == R_SECONDARY) {
1373 if (os.aftr_isp != ns.aftr_isp)
1374 resume_next_sg(mdev);
1377 after_all_state_ch(mdev->tconn);
1382 struct after_conn_state_chg_work {
1385 union drbd_state ns_min;
1386 union drbd_state ns_max; /* new, max state, over all mdevs */
1387 enum chg_state_flags flags;
1390 static void after_all_state_ch(struct drbd_tconn *tconn)
1392 if (conn_all_vols_unconf(tconn))
1393 drbd_thread_stop_nowait(&tconn->worker);
1396 static int w_after_conn_state_ch(struct drbd_work *w, int unused)
1398 struct after_conn_state_chg_work *acscw =
1399 container_of(w, struct after_conn_state_chg_work, w);
1400 struct drbd_tconn *tconn = w->tconn;
1401 enum drbd_conns oc = acscw->oc;
1402 union drbd_state ns_max = acscw->ns_max;
1403 union drbd_state ns_min = acscw->ns_min;
1404 struct drbd_conf *mdev;
1409 /* Upon network configuration, we need to start the receiver */
1410 if (oc == C_STANDALONE && ns_max.conn == C_UNCONNECTED)
1411 drbd_thread_start(&tconn->receiver);
1413 if (ns_max.susp_fen) {
1414 /* case1: The outdate peer handler is successful: */
1415 if (ns_max.pdsk <= D_OUTDATED) {
1418 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1419 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1420 drbd_uuid_new_current(mdev);
1421 clear_bit(NEW_CUR_UUID, &mdev->flags);
1425 conn_request_state(tconn,
1426 (union drbd_state) { { .susp_fen = 1 } },
1427 (union drbd_state) { { .susp_fen = 0 } },
1430 /* case2: The connection was established again: */
1431 if (ns_min.conn >= C_CONNECTED) {
1433 idr_for_each_entry(&tconn->volumes, mdev, vnr)
1434 clear_bit(NEW_CUR_UUID, &mdev->flags);
1436 spin_lock_irq(&tconn->req_lock);
1437 _tl_restart(tconn, RESEND);
1438 _conn_request_state(tconn,
1439 (union drbd_state) { { .susp_fen = 1 } },
1440 (union drbd_state) { { .susp_fen = 0 } },
1442 spin_unlock_irq(&tconn->req_lock);
1447 //conn_err(tconn, STATE_FMT, STATE_ARGS("nms", nms));
1448 after_all_state_ch(tconn);
1449 kref_put(&tconn->kref, &conn_destroy);
1454 void conn_old_common_state(struct drbd_tconn *tconn, union drbd_state *pcs, enum chg_state_flags *pf)
1456 enum chg_state_flags flags = ~0;
1457 union drbd_dev_state os, cs = {}; /* old_state, common_state */
1458 struct drbd_conf *mdev;
1459 int vnr, first_vol = 1;
1462 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1471 if (cs.role != os.role)
1472 flags &= ~CS_DC_ROLE;
1474 if (cs.peer != os.peer)
1475 flags &= ~CS_DC_PEER;
1477 if (cs.conn != os.conn)
1478 flags &= ~CS_DC_CONN;
1480 if (cs.disk != os.disk)
1481 flags &= ~CS_DC_DISK;
1483 if (cs.pdsk != os.pdsk)
1484 flags &= ~CS_DC_PDSK;
1493 static enum drbd_state_rv
1494 conn_is_valid_transition(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1495 enum chg_state_flags flags)
1497 enum drbd_state_rv rv = SS_SUCCESS;
1498 union drbd_state ns, os;
1499 struct drbd_conf *mdev;
1503 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1504 os = drbd_read_state(mdev);
1505 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
1507 if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
1513 rv = is_valid_transition(os, ns);
1514 if (rv < SS_SUCCESS)
1517 if (!(flags & CS_HARD)) {
1518 rv = is_valid_state(mdev, ns);
1519 if (rv < SS_SUCCESS) {
1520 if (is_valid_state(mdev, os) == rv)
1521 rv = is_valid_soft_transition(os, ns);
1523 rv = is_valid_soft_transition(os, ns);
1525 if (rv < SS_SUCCESS)
1530 if (rv < SS_SUCCESS && flags & CS_VERBOSE)
1531 print_st_err(mdev, os, ns, rv);
1537 conn_set_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1538 union drbd_state *pns_min, union drbd_state *pns_max, enum chg_state_flags flags)
1540 union drbd_state ns, os, ns_max = { };
1541 union drbd_state ns_min = {
1547 struct drbd_conf *mdev;
1548 enum drbd_state_rv rv;
1551 if (mask.conn == C_MASK)
1552 tconn->cstate = val.conn;
1555 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1556 os = drbd_read_state(mdev);
1557 ns = apply_mask_val(os, mask, val);
1558 ns = sanitize_state(mdev, ns, NULL);
1560 if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
1563 rv = __drbd_set_state(mdev, ns, flags, NULL);
1564 if (rv < SS_SUCCESS)
1567 ns.i = mdev->state.i;
1568 ns_max.role = max_role(ns.role, ns_max.role);
1569 ns_max.peer = max_role(ns.peer, ns_max.peer);
1570 ns_max.conn = max_t(enum drbd_conns, ns.conn, ns_max.conn);
1571 ns_max.disk = max_t(enum drbd_disk_state, ns.disk, ns_max.disk);
1572 ns_max.pdsk = max_t(enum drbd_disk_state, ns.pdsk, ns_max.pdsk);
1574 ns_min.role = min_role(ns.role, ns_min.role);
1575 ns_min.peer = min_role(ns.peer, ns_min.peer);
1576 ns_min.conn = min_t(enum drbd_conns, ns.conn, ns_min.conn);
1577 ns_min.disk = min_t(enum drbd_disk_state, ns.disk, ns_min.disk);
1578 ns_min.pdsk = min_t(enum drbd_disk_state, ns.pdsk, ns_min.pdsk);
1582 ns_min.susp = ns_max.susp = tconn->susp;
1583 ns_min.susp_nod = ns_max.susp_nod = tconn->susp_nod;
1584 ns_min.susp_fen = ns_max.susp_fen = tconn->susp_fen;
1590 static enum drbd_state_rv
1591 _conn_rq_cond(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val)
1593 enum drbd_state_rv rv;
1595 if (test_and_clear_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags))
1596 return SS_CW_SUCCESS;
1598 if (test_and_clear_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags))
1599 return SS_CW_FAILED_BY_PEER;
1601 spin_lock_irq(&tconn->req_lock);
1602 rv = tconn->cstate != C_WF_REPORT_PARAMS ? SS_CW_NO_NEED : SS_UNKNOWN_ERROR;
1604 if (rv == SS_UNKNOWN_ERROR)
1605 rv = conn_is_valid_transition(tconn, mask, val, 0);
1607 if (rv == SS_SUCCESS)
1608 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
1610 spin_unlock_irq(&tconn->req_lock);
1615 static enum drbd_state_rv
1616 conn_cl_wide(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1617 enum chg_state_flags f)
1619 enum drbd_state_rv rv;
1621 spin_unlock_irq(&tconn->req_lock);
1622 mutex_lock(&tconn->cstate_mutex);
1624 if (conn_send_state_req(tconn, mask, val)) {
1625 rv = SS_CW_FAILED_BY_PEER;
1626 /* if (f & CS_VERBOSE)
1627 print_st_err(mdev, os, ns, rv); */
1631 wait_event(tconn->ping_wait, (rv = _conn_rq_cond(tconn, mask, val)));
1634 mutex_unlock(&tconn->cstate_mutex);
1635 spin_lock_irq(&tconn->req_lock);
1641 _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1642 enum chg_state_flags flags)
1644 enum drbd_state_rv rv = SS_SUCCESS;
1645 struct after_conn_state_chg_work *acscw;
1646 enum drbd_conns oc = tconn->cstate;
1647 union drbd_state ns_max, ns_min, os;
1649 rv = is_valid_conn_transition(oc, val.conn);
1650 if (rv < SS_SUCCESS)
1653 rv = conn_is_valid_transition(tconn, mask, val, flags);
1654 if (rv < SS_SUCCESS)
1657 if (oc == C_WF_REPORT_PARAMS && val.conn == C_DISCONNECTING &&
1658 !(flags & (CS_LOCAL_ONLY | CS_HARD))) {
1659 rv = conn_cl_wide(tconn, mask, val, flags);
1660 if (rv < SS_SUCCESS)
1664 conn_old_common_state(tconn, &os, &flags);
1665 flags |= CS_DC_SUSP;
1666 conn_set_state(tconn, mask, val, &ns_min, &ns_max, flags);
1667 conn_pr_state_change(tconn, os, ns_max, flags);
1669 acscw = kmalloc(sizeof(*acscw), GFP_ATOMIC);
1671 acscw->oc = os.conn;
1672 acscw->ns_min = ns_min;
1673 acscw->ns_max = ns_max;
1674 acscw->flags = flags;
1675 acscw->w.cb = w_after_conn_state_ch;
1676 kref_get(&tconn->kref);
1677 acscw->w.tconn = tconn;
1678 drbd_queue_work(&tconn->data.work, &acscw->w);
1680 conn_err(tconn, "Could not kmalloc an acscw\n");
1688 conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1689 enum chg_state_flags flags)
1691 enum drbd_state_rv rv;
1693 spin_lock_irq(&tconn->req_lock);
1694 rv = _conn_request_state(tconn, mask, val, flags);
1695 spin_unlock_irq(&tconn->req_lock);