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>
33 extern void tl_abort_disk_io(struct drbd_conf *mdev);
35 struct after_state_chg_work {
39 enum chg_state_flags flags;
40 struct completion *done;
43 enum sanitize_state_warnings {
45 ABORTED_ONLINE_VERIFY,
47 CONNECTION_LOST_NEGOTIATING,
48 IMPLICITLY_UPGRADED_DISK,
49 IMPLICITLY_UPGRADED_PDSK,
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);
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);
61 static inline bool is_susp(union drbd_state s)
63 return s.susp || s.susp_nod || s.susp_fen;
66 bool conn_all_vols_unconf(struct drbd_tconn *tconn)
68 struct drbd_conf *mdev;
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) {
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)
90 if (role1 == R_PRIMARY || role2 == R_PRIMARY)
92 if (role1 == R_SECONDARY || role2 == R_SECONDARY)
96 static enum drbd_role min_role(enum drbd_role role1, enum drbd_role role2)
98 if (role1 == R_UNKNOWN || role2 == R_UNKNOWN)
100 if (role1 == R_SECONDARY || role2 == R_SECONDARY)
105 enum drbd_role conn_highest_role(struct drbd_tconn *tconn)
107 enum drbd_role role = R_UNKNOWN;
108 struct drbd_conf *mdev;
112 idr_for_each_entry(&tconn->volumes, mdev, vnr)
113 role = max_role(role, mdev->state.role);
119 enum drbd_role conn_highest_peer(struct drbd_tconn *tconn)
121 enum drbd_role peer = R_UNKNOWN;
122 struct drbd_conf *mdev;
126 idr_for_each_entry(&tconn->volumes, mdev, vnr)
127 peer = max_role(peer, mdev->state.peer);
133 enum drbd_disk_state conn_highest_disk(struct drbd_tconn *tconn)
135 enum drbd_disk_state ds = D_DISKLESS;
136 struct drbd_conf *mdev;
140 idr_for_each_entry(&tconn->volumes, mdev, vnr)
141 ds = max_t(enum drbd_disk_state, ds, mdev->state.disk);
147 enum drbd_disk_state conn_lowest_disk(struct drbd_tconn *tconn)
149 enum drbd_disk_state ds = D_MASK;
150 struct drbd_conf *mdev;
154 idr_for_each_entry(&tconn->volumes, mdev, vnr)
155 ds = min_t(enum drbd_disk_state, ds, mdev->state.disk);
161 enum drbd_disk_state conn_highest_pdsk(struct drbd_tconn *tconn)
163 enum drbd_disk_state ds = D_DISKLESS;
164 struct drbd_conf *mdev;
168 idr_for_each_entry(&tconn->volumes, mdev, vnr)
169 ds = max_t(enum drbd_disk_state, ds, mdev->state.pdsk);
175 enum drbd_conns conn_lowest_conn(struct drbd_tconn *tconn)
177 enum drbd_conns conn = C_MASK;
178 struct drbd_conf *mdev;
182 idr_for_each_entry(&tconn->volumes, mdev, vnr)
183 conn = min_t(enum drbd_conns, conn, mdev->state.conn);
190 * cl_wide_st_chg() - true if the state change is a cluster wide one
191 * @mdev: DRBD device.
192 * @os: old (current) state.
193 * @ns: new (wanted) state.
195 static int cl_wide_st_chg(struct drbd_conf *mdev,
196 union drbd_state os, union drbd_state ns)
198 return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED &&
199 ((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
200 (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
201 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
202 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) ||
203 (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
204 (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S) ||
205 (os.conn == C_CONNECTED && ns.conn == C_WF_REPORT_PARAMS);
208 static union drbd_state
209 apply_mask_val(union drbd_state os, union drbd_state mask, union drbd_state val)
212 ns.i = (os.i & ~mask.i) | val.i;
217 drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
218 union drbd_state mask, union drbd_state val)
222 enum drbd_state_rv rv;
224 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
225 ns = apply_mask_val(drbd_read_state(mdev), mask, val);
226 rv = _drbd_set_state(mdev, ns, f, NULL);
227 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
233 * drbd_force_state() - Impose a change which happens outside our control on our state
234 * @mdev: DRBD device.
235 * @mask: mask of state bits to change.
236 * @val: value of new state bits.
238 void drbd_force_state(struct drbd_conf *mdev,
239 union drbd_state mask, union drbd_state val)
241 drbd_change_state(mdev, CS_HARD, mask, val);
244 static enum drbd_state_rv
245 _req_st_cond(struct drbd_conf *mdev, union drbd_state mask,
246 union drbd_state val)
248 union drbd_state os, ns;
250 enum drbd_state_rv rv;
252 if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
253 return SS_CW_SUCCESS;
255 if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
256 return SS_CW_FAILED_BY_PEER;
258 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
259 os = drbd_read_state(mdev);
260 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
261 rv = is_valid_transition(os, ns);
262 if (rv == SS_SUCCESS)
263 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
265 if (!cl_wide_st_chg(mdev, os, ns))
267 if (rv == SS_UNKNOWN_ERROR) {
268 rv = is_valid_state(mdev, ns);
269 if (rv == SS_SUCCESS) {
270 rv = is_valid_soft_transition(os, ns);
271 if (rv == SS_SUCCESS)
272 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
275 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
281 * drbd_req_state() - Perform an eventually cluster wide state change
282 * @mdev: DRBD device.
283 * @mask: mask of state bits to change.
284 * @val: value of new state bits.
287 * Should not be called directly, use drbd_request_state() or
288 * _drbd_request_state().
290 static enum drbd_state_rv
291 drbd_req_state(struct drbd_conf *mdev, union drbd_state mask,
292 union drbd_state val, enum chg_state_flags f)
294 struct completion done;
296 union drbd_state os, ns;
297 enum drbd_state_rv rv;
299 init_completion(&done);
301 if (f & CS_SERIALIZE)
302 mutex_lock(mdev->state_mutex);
304 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
305 os = drbd_read_state(mdev);
306 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
307 rv = is_valid_transition(os, ns);
308 if (rv < SS_SUCCESS) {
309 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
313 if (cl_wide_st_chg(mdev, os, ns)) {
314 rv = is_valid_state(mdev, ns);
315 if (rv == SS_SUCCESS)
316 rv = is_valid_soft_transition(os, ns);
317 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
319 if (rv < SS_SUCCESS) {
321 print_st_err(mdev, os, ns, rv);
325 if (drbd_send_state_req(mdev, mask, val)) {
326 rv = SS_CW_FAILED_BY_PEER;
328 print_st_err(mdev, os, ns, rv);
332 wait_event(mdev->state_wait,
333 (rv = _req_st_cond(mdev, mask, val)));
335 if (rv < SS_SUCCESS) {
337 print_st_err(mdev, os, ns, rv);
340 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
341 ns = apply_mask_val(drbd_read_state(mdev), mask, val);
342 rv = _drbd_set_state(mdev, ns, f, &done);
344 rv = _drbd_set_state(mdev, ns, f, &done);
347 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
349 if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
350 D_ASSERT(current != mdev->tconn->worker.task);
351 wait_for_completion(&done);
355 if (f & CS_SERIALIZE)
356 mutex_unlock(mdev->state_mutex);
362 * _drbd_request_state() - Request a state change (with flags)
363 * @mdev: DRBD device.
364 * @mask: mask of state bits to change.
365 * @val: value of new state bits.
368 * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE
369 * flag, or when logging of failed state change requests is not desired.
372 _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask,
373 union drbd_state val, enum chg_state_flags f)
375 enum drbd_state_rv rv;
377 wait_event(mdev->state_wait,
378 (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE);
383 static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns)
385 dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c%c%c }\n",
387 drbd_conn_str(ns.conn),
388 drbd_role_str(ns.role),
389 drbd_role_str(ns.peer),
390 drbd_disk_str(ns.disk),
391 drbd_disk_str(ns.pdsk),
392 is_susp(ns) ? 's' : 'r',
393 ns.aftr_isp ? 'a' : '-',
394 ns.peer_isp ? 'p' : '-',
395 ns.user_isp ? 'u' : '-',
396 ns.susp_fen ? 'F' : '-',
397 ns.susp_nod ? 'N' : '-'
401 void print_st_err(struct drbd_conf *mdev, union drbd_state os,
402 union drbd_state ns, enum drbd_state_rv err)
404 if (err == SS_IN_TRANSIENT_STATE)
406 dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err));
407 print_st(mdev, " state", os);
408 print_st(mdev, "wanted", ns);
411 static long print_state_change(char *pb, union drbd_state os, union drbd_state ns,
412 enum chg_state_flags flags)
418 if (ns.role != os.role && flags & CS_DC_ROLE)
419 pbp += sprintf(pbp, "role( %s -> %s ) ",
420 drbd_role_str(os.role),
421 drbd_role_str(ns.role));
422 if (ns.peer != os.peer && flags & CS_DC_PEER)
423 pbp += sprintf(pbp, "peer( %s -> %s ) ",
424 drbd_role_str(os.peer),
425 drbd_role_str(ns.peer));
426 if (ns.conn != os.conn && flags & CS_DC_CONN)
427 pbp += sprintf(pbp, "conn( %s -> %s ) ",
428 drbd_conn_str(os.conn),
429 drbd_conn_str(ns.conn));
430 if (ns.disk != os.disk && flags & CS_DC_DISK)
431 pbp += sprintf(pbp, "disk( %s -> %s ) ",
432 drbd_disk_str(os.disk),
433 drbd_disk_str(ns.disk));
434 if (ns.pdsk != os.pdsk && flags & CS_DC_PDSK)
435 pbp += sprintf(pbp, "pdsk( %s -> %s ) ",
436 drbd_disk_str(os.pdsk),
437 drbd_disk_str(ns.pdsk));
442 static void drbd_pr_state_change(struct drbd_conf *mdev, union drbd_state os, union drbd_state ns,
443 enum chg_state_flags flags)
448 pbp += print_state_change(pbp, os, ns, flags ^ CS_DC_MASK);
450 if (ns.aftr_isp != os.aftr_isp)
451 pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ",
454 if (ns.peer_isp != os.peer_isp)
455 pbp += sprintf(pbp, "peer_isp( %d -> %d ) ",
458 if (ns.user_isp != os.user_isp)
459 pbp += sprintf(pbp, "user_isp( %d -> %d ) ",
464 dev_info(DEV, "%s\n", pb);
467 static void conn_pr_state_change(struct drbd_tconn *tconn, union drbd_state os, union drbd_state ns,
468 enum chg_state_flags flags)
473 pbp += print_state_change(pbp, os, ns, flags);
475 if (is_susp(ns) != is_susp(os) && flags & CS_DC_SUSP)
476 pbp += sprintf(pbp, "susp( %d -> %d ) ",
481 conn_info(tconn, "%s\n", pb);
486 * is_valid_state() - Returns an SS_ error code if ns is not valid
487 * @mdev: DRBD device.
488 * @ns: State to consider.
490 static enum drbd_state_rv
491 is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
493 /* See drbd_state_sw_errors in drbd_strings.c */
495 enum drbd_fencing_p fp;
496 enum drbd_state_rv rv = SS_SUCCESS;
501 if (get_ldev(mdev)) {
502 fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
506 nc = rcu_dereference(mdev->tconn->net_conf);
508 if (!nc->two_primaries && ns.role == R_PRIMARY) {
509 if (ns.peer == R_PRIMARY)
510 rv = SS_TWO_PRIMARIES;
511 else if (conn_highest_peer(mdev->tconn) == R_PRIMARY)
512 rv = SS_O_VOL_PEER_PRI;
517 /* already found a reason to abort */;
518 else if (ns.role == R_SECONDARY && mdev->open_cnt)
519 rv = SS_DEVICE_IN_USE;
521 else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE)
522 rv = SS_NO_UP_TO_DATE_DISK;
524 else if (fp >= FP_RESOURCE &&
525 ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN)
528 else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT)
529 rv = SS_NO_UP_TO_DATE_DISK;
531 else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT)
532 rv = SS_NO_LOCAL_DISK;
534 else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT)
535 rv = SS_NO_REMOTE_DISK;
537 else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)
538 rv = SS_NO_UP_TO_DATE_DISK;
540 else if ((ns.conn == C_CONNECTED ||
541 ns.conn == C_WF_BITMAP_S ||
542 ns.conn == C_SYNC_SOURCE ||
543 ns.conn == C_PAUSED_SYNC_S) &&
544 ns.disk == D_OUTDATED)
545 rv = SS_CONNECTED_OUTDATES;
547 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
548 (nc->verify_alg[0] == 0))
549 rv = SS_NO_VERIFY_ALG;
551 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
552 mdev->tconn->agreed_pro_version < 88)
553 rv = SS_NOT_SUPPORTED;
555 else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN)
556 rv = SS_CONNECTED_OUTDATES;
564 * is_valid_soft_transition() - Returns an SS_ error code if the state transition is not possible
565 * This function limits state transitions that may be declined by DRBD. I.e.
566 * user requests (aka soft transitions).
567 * @mdev: DRBD device.
571 static enum drbd_state_rv
572 is_valid_soft_transition(union drbd_state os, union drbd_state ns)
574 enum drbd_state_rv rv = SS_SUCCESS;
576 if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) &&
577 os.conn > C_CONNECTED)
578 rv = SS_RESYNC_RUNNING;
580 if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE)
581 rv = SS_ALREADY_STANDALONE;
583 if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS)
586 if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED)
587 rv = SS_NO_NET_CONFIG;
589 if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING)
590 rv = SS_LOWER_THAN_OUTDATED;
592 if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
593 rv = SS_IN_TRANSIENT_STATE;
595 /* if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
596 rv = SS_IN_TRANSIENT_STATE; */
598 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
599 rv = SS_NEED_CONNECTION;
601 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
602 ns.conn != os.conn && os.conn > C_CONNECTED)
603 rv = SS_RESYNC_RUNNING;
605 if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) &&
606 os.conn < C_CONNECTED)
607 rv = SS_NEED_CONNECTION;
609 if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)
610 && os.conn < C_WF_REPORT_PARAMS)
611 rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */
616 static enum drbd_state_rv
617 is_valid_conn_transition(enum drbd_conns oc, enum drbd_conns nc)
619 /* no change -> nothing to do, at least for the connection part */
621 return SS_NOTHING_TO_DO;
623 /* disconnect of an unconfigured connection does not make sense */
624 if (oc == C_STANDALONE && nc == C_DISCONNECTING)
625 return SS_ALREADY_STANDALONE;
627 /* from C_STANDALONE, we start with C_UNCONNECTED */
628 if (oc == C_STANDALONE && nc != C_UNCONNECTED)
629 return SS_NEED_CONNECTION;
631 /* After a network error only C_UNCONNECTED or C_DISCONNECTING may follow. */
632 if (oc >= C_TIMEOUT && oc <= C_TEAR_DOWN && nc != C_UNCONNECTED && nc != C_DISCONNECTING)
633 return SS_IN_TRANSIENT_STATE;
635 /* After C_DISCONNECTING only C_STANDALONE may follow */
636 if (oc == C_DISCONNECTING && nc != C_STANDALONE)
637 return SS_IN_TRANSIENT_STATE;
644 * is_valid_transition() - Returns an SS_ error code if the state transition is not possible
645 * This limits hard state transitions. Hard state transitions are facts there are
646 * imposed on DRBD by the environment. E.g. disk broke or network broke down.
647 * But those hard state transitions are still not allowed to do everything.
651 static enum drbd_state_rv
652 is_valid_transition(union drbd_state os, union drbd_state ns)
654 enum drbd_state_rv rv;
656 rv = is_valid_conn_transition(os.conn, ns.conn);
658 /* we cannot fail (again) if we already detached */
659 if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
665 static void print_sanitize_warnings(struct drbd_conf *mdev, enum sanitize_state_warnings warn)
667 static const char *msg_table[] = {
669 [ABORTED_ONLINE_VERIFY] = "Online-verify aborted.",
670 [ABORTED_RESYNC] = "Resync aborted.",
671 [CONNECTION_LOST_NEGOTIATING] = "Connection lost while negotiating, no data!",
672 [IMPLICITLY_UPGRADED_DISK] = "Implicitly upgraded disk",
673 [IMPLICITLY_UPGRADED_PDSK] = "Implicitly upgraded pdsk",
676 if (warn != NO_WARNING)
677 dev_warn(DEV, "%s\n", msg_table[warn]);
681 * sanitize_state() - Resolves implicitly necessary additional changes to a state transition
682 * @mdev: DRBD device.
687 * When we loose connection, we have to set the state of the peers disk (pdsk)
688 * to D_UNKNOWN. This rule and many more along those lines are in this function.
690 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns,
691 enum sanitize_state_warnings *warn)
693 enum drbd_fencing_p fp;
694 enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max;
700 if (get_ldev(mdev)) {
702 fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
707 /* Implications from connection to peer and peer_isp */
708 if (ns.conn < C_CONNECTED) {
711 if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT)
715 /* Clear the aftr_isp when becoming unconfigured */
716 if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY)
719 /* An implication of the disk states onto the connection state */
720 /* Abort resync if a disk fails/detaches */
721 if (ns.conn > C_CONNECTED && (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
723 *warn = ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T ?
724 ABORTED_ONLINE_VERIFY : ABORTED_RESYNC;
725 ns.conn = C_CONNECTED;
728 /* Connection breaks down before we finished "Negotiating" */
729 if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING &&
730 get_ldev_if_state(mdev, D_NEGOTIATING)) {
731 if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) {
732 ns.disk = mdev->new_state_tmp.disk;
733 ns.pdsk = mdev->new_state_tmp.pdsk;
736 *warn = CONNECTION_LOST_NEGOTIATING;
737 ns.disk = D_DISKLESS;
743 /* D_CONSISTENT and D_OUTDATED vanish when we get connected */
744 if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) {
745 if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED)
746 ns.disk = D_UP_TO_DATE;
747 if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)
748 ns.pdsk = D_UP_TO_DATE;
751 /* Implications of the connection stat on the disk states */
752 disk_min = D_DISKLESS;
753 disk_max = D_UP_TO_DATE;
754 pdsk_min = D_INCONSISTENT;
755 pdsk_max = D_UNKNOWN;
756 switch ((enum drbd_conns)ns.conn) {
758 case C_PAUSED_SYNC_T:
759 case C_STARTING_SYNC_T:
762 disk_min = D_INCONSISTENT;
763 disk_max = D_OUTDATED;
764 pdsk_min = D_UP_TO_DATE;
765 pdsk_max = D_UP_TO_DATE;
769 disk_min = D_UP_TO_DATE;
770 disk_max = D_UP_TO_DATE;
771 pdsk_min = D_UP_TO_DATE;
772 pdsk_max = D_UP_TO_DATE;
775 disk_min = D_DISKLESS;
776 disk_max = D_UP_TO_DATE;
777 pdsk_min = D_DISKLESS;
778 pdsk_max = D_UP_TO_DATE;
781 case C_PAUSED_SYNC_S:
782 case C_STARTING_SYNC_S:
784 disk_min = D_UP_TO_DATE;
785 disk_max = D_UP_TO_DATE;
786 pdsk_min = D_INCONSISTENT;
787 pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/
790 disk_min = D_INCONSISTENT;
791 disk_max = D_INCONSISTENT;
792 pdsk_min = D_UP_TO_DATE;
793 pdsk_max = D_UP_TO_DATE;
796 disk_min = D_UP_TO_DATE;
797 disk_max = D_UP_TO_DATE;
798 pdsk_min = D_INCONSISTENT;
799 pdsk_max = D_INCONSISTENT;
802 case C_DISCONNECTING:
806 case C_NETWORK_FAILURE:
807 case C_PROTOCOL_ERROR:
809 case C_WF_CONNECTION:
810 case C_WF_REPORT_PARAMS:
814 if (ns.disk > disk_max)
817 if (ns.disk < disk_min) {
819 *warn = IMPLICITLY_UPGRADED_DISK;
822 if (ns.pdsk > pdsk_max)
825 if (ns.pdsk < pdsk_min) {
827 *warn = IMPLICITLY_UPGRADED_PDSK;
831 if (fp == FP_STONITH &&
832 (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED))
833 ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */
835 if (mdev->tconn->res_opts.on_no_data == OND_SUSPEND_IO &&
836 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
837 ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */
839 if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
840 if (ns.conn == C_SYNC_SOURCE)
841 ns.conn = C_PAUSED_SYNC_S;
842 if (ns.conn == C_SYNC_TARGET)
843 ns.conn = C_PAUSED_SYNC_T;
845 if (ns.conn == C_PAUSED_SYNC_S)
846 ns.conn = C_SYNC_SOURCE;
847 if (ns.conn == C_PAUSED_SYNC_T)
848 ns.conn = C_SYNC_TARGET;
854 void drbd_resume_al(struct drbd_conf *mdev)
856 if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
857 dev_info(DEV, "Resumed AL updates\n");
860 /* helper for __drbd_set_state */
861 static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
863 if (mdev->tconn->agreed_pro_version < 90)
864 mdev->ov_start_sector = 0;
865 mdev->rs_total = drbd_bm_bits(mdev);
866 mdev->ov_position = 0;
867 if (cs == C_VERIFY_T) {
868 /* starting online verify from an arbitrary position
869 * does not fit well into the existing protocol.
870 * on C_VERIFY_T, we initialize ov_left and friends
871 * implicitly in receive_DataRequest once the
872 * first P_OV_REQUEST is received */
873 mdev->ov_start_sector = ~(sector_t)0;
875 unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector);
876 if (bit >= mdev->rs_total) {
877 mdev->ov_start_sector =
878 BM_BIT_TO_SECT(mdev->rs_total - 1);
881 mdev->rs_total -= bit;
882 mdev->ov_position = mdev->ov_start_sector;
884 mdev->ov_left = mdev->rs_total;
888 * __drbd_set_state() - Set a new DRBD state
889 * @mdev: DRBD device.
892 * @done: Optional completion, that will get completed after the after_state_ch() finished
894 * Caller needs to hold req_lock, and global_state_lock. Do not call directly.
897 __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
898 enum chg_state_flags flags, struct completion *done)
901 enum drbd_state_rv rv = SS_SUCCESS;
902 enum sanitize_state_warnings ssw;
903 struct after_state_chg_work *ascw;
905 os = drbd_read_state(mdev);
907 ns = sanitize_state(mdev, ns, &ssw);
909 return SS_NOTHING_TO_DO;
911 rv = is_valid_transition(os, ns);
915 if (!(flags & CS_HARD)) {
916 /* pre-state-change checks ; only look at ns */
917 /* See drbd_state_sw_errors in drbd_strings.c */
919 rv = is_valid_state(mdev, ns);
920 if (rv < SS_SUCCESS) {
921 /* If the old state was illegal as well, then let
924 if (is_valid_state(mdev, os) == rv)
925 rv = is_valid_soft_transition(os, ns);
927 rv = is_valid_soft_transition(os, ns);
930 if (rv < SS_SUCCESS) {
931 if (flags & CS_VERBOSE)
932 print_st_err(mdev, os, ns, rv);
936 print_sanitize_warnings(mdev, ssw);
938 drbd_pr_state_change(mdev, os, ns, flags);
940 /* Display changes to the susp* flags that where caused by the call to
941 sanitize_state(). Only display it here if we where not called from
942 _conn_request_state() */
943 if (!(flags & CS_DC_SUSP))
944 conn_pr_state_change(mdev->tconn, os, ns, (flags & ~CS_DC_MASK) | CS_DC_SUSP);
946 /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
947 * on the ldev here, to be sure the transition -> D_DISKLESS resp.
948 * drbd_ldev_destroy() won't happen before our corresponding
949 * after_state_ch works run, where we put_ldev again. */
950 if ((os.disk != D_FAILED && ns.disk == D_FAILED) ||
951 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))
952 atomic_inc(&mdev->local_cnt);
954 mdev->state.i = ns.i;
955 mdev->tconn->susp = ns.susp;
956 mdev->tconn->susp_nod = ns.susp_nod;
957 mdev->tconn->susp_fen = ns.susp_fen;
959 if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING)
960 drbd_print_uuids(mdev, "attached to UUIDs");
962 wake_up(&mdev->misc_wait);
963 wake_up(&mdev->state_wait);
964 wake_up(&mdev->tconn->ping_wait);
966 /* aborted verify run. log the last position */
967 if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
968 ns.conn < C_CONNECTED) {
969 mdev->ov_start_sector =
970 BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left);
971 dev_info(DEV, "Online Verify reached sector %llu\n",
972 (unsigned long long)mdev->ov_start_sector);
975 if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
976 (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
977 dev_info(DEV, "Syncer continues.\n");
978 mdev->rs_paused += (long)jiffies
979 -(long)mdev->rs_mark_time[mdev->rs_last_mark];
980 if (ns.conn == C_SYNC_TARGET)
981 mod_timer(&mdev->resync_timer, jiffies);
984 if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
985 (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
986 dev_info(DEV, "Resync suspended\n");
987 mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
990 if (os.conn == C_CONNECTED &&
991 (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
992 unsigned long now = jiffies;
995 set_ov_position(mdev, ns.conn);
996 mdev->rs_start = now;
997 mdev->rs_last_events = 0;
998 mdev->rs_last_sect_ev = 0;
999 mdev->ov_last_oos_size = 0;
1000 mdev->ov_last_oos_start = 0;
1002 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
1003 mdev->rs_mark_left[i] = mdev->ov_left;
1004 mdev->rs_mark_time[i] = now;
1007 drbd_rs_controller_reset(mdev);
1009 if (ns.conn == C_VERIFY_S) {
1010 dev_info(DEV, "Starting Online Verify from sector %llu\n",
1011 (unsigned long long)mdev->ov_position);
1012 mod_timer(&mdev->resync_timer, jiffies);
1016 if (get_ldev(mdev)) {
1017 u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
1018 MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
1019 MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
1021 mdf &= ~MDF_AL_CLEAN;
1022 if (test_bit(CRASHED_PRIMARY, &mdev->flags))
1023 mdf |= MDF_CRASHED_PRIMARY;
1024 if (mdev->state.role == R_PRIMARY ||
1025 (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
1026 mdf |= MDF_PRIMARY_IND;
1027 if (mdev->state.conn > C_WF_REPORT_PARAMS)
1028 mdf |= MDF_CONNECTED_IND;
1029 if (mdev->state.disk > D_INCONSISTENT)
1030 mdf |= MDF_CONSISTENT;
1031 if (mdev->state.disk > D_OUTDATED)
1032 mdf |= MDF_WAS_UP_TO_DATE;
1033 if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
1034 mdf |= MDF_PEER_OUT_DATED;
1035 if (mdf != mdev->ldev->md.flags) {
1036 mdev->ldev->md.flags = mdf;
1037 drbd_md_mark_dirty(mdev);
1039 if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
1040 drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
1044 /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
1045 if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
1046 os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
1047 set_bit(CONSIDER_RESYNC, &mdev->flags);
1049 /* Receiver should clean up itself */
1050 if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
1051 drbd_thread_stop_nowait(&mdev->tconn->receiver);
1053 /* Now the receiver finished cleaning up itself, it should die */
1054 if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
1055 drbd_thread_stop_nowait(&mdev->tconn->receiver);
1057 /* Upon network failure, we need to restart the receiver. */
1058 if (os.conn > C_WF_CONNECTION &&
1059 ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
1060 drbd_thread_restart_nowait(&mdev->tconn->receiver);
1062 /* Resume AL writing if we get a connection */
1063 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1064 drbd_resume_al(mdev);
1066 ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
1070 ascw->flags = flags;
1071 ascw->w.cb = w_after_state_ch;
1072 ascw->w.mdev = mdev;
1074 drbd_queue_work(&mdev->tconn->data.work, &ascw->w);
1076 dev_err(DEV, "Could not kmalloc an ascw\n");
1082 static int w_after_state_ch(struct drbd_work *w, int unused)
1084 struct after_state_chg_work *ascw =
1085 container_of(w, struct after_state_chg_work, w);
1086 struct drbd_conf *mdev = w->mdev;
1088 after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
1089 if (ascw->flags & CS_WAIT_COMPLETE) {
1090 D_ASSERT(ascw->done != NULL);
1091 complete(ascw->done);
1098 static void abw_start_sync(struct drbd_conf *mdev, int rv)
1101 dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
1102 _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
1106 switch (mdev->state.conn) {
1107 case C_STARTING_SYNC_T:
1108 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
1110 case C_STARTING_SYNC_S:
1111 drbd_start_resync(mdev, C_SYNC_SOURCE);
1116 int drbd_bitmap_io_from_worker(struct drbd_conf *mdev,
1117 int (*io_fn)(struct drbd_conf *),
1118 char *why, enum bm_flag flags)
1122 D_ASSERT(current == mdev->tconn->worker.task);
1124 /* open coded non-blocking drbd_suspend_io(mdev); */
1125 set_bit(SUSPEND_IO, &mdev->flags);
1127 drbd_bm_lock(mdev, why, flags);
1129 drbd_bm_unlock(mdev);
1131 drbd_resume_io(mdev);
1137 * after_state_ch() - Perform after state change actions that may sleep
1138 * @mdev: DRBD device.
1143 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
1144 union drbd_state ns, enum chg_state_flags flags)
1146 struct sib_info sib;
1148 sib.sib_reason = SIB_STATE_CHANGE;
1152 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
1153 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1155 mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
1158 /* Inform userspace about the change... */
1159 drbd_bcast_event(mdev, &sib);
1161 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
1162 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
1163 drbd_khelper(mdev, "pri-on-incon-degr");
1165 /* Here we have the actions that are performed after a
1166 state change. This function might sleep */
1169 enum drbd_req_event what = NOTHING;
1171 if (os.conn < C_CONNECTED && conn_lowest_conn(mdev->tconn) >= C_CONNECTED)
1174 if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) &&
1175 conn_lowest_disk(mdev->tconn) > D_NEGOTIATING)
1176 what = RESTART_FROZEN_DISK_IO;
1178 if (what != NOTHING) {
1179 spin_lock_irq(&mdev->tconn->req_lock);
1180 _tl_restart(mdev->tconn, what);
1181 _drbd_set_state(_NS(mdev, susp_nod, 0), CS_VERBOSE, NULL);
1182 spin_unlock_irq(&mdev->tconn->req_lock);
1186 /* Became sync source. With protocol >= 96, we still need to send out
1187 * the sync uuid now. Need to do that before any drbd_send_state, or
1188 * the other side may go "paused sync" before receiving the sync uuids,
1189 * which is unexpected. */
1190 if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) &&
1191 (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) &&
1192 mdev->tconn->agreed_pro_version >= 96 && get_ldev(mdev)) {
1193 drbd_gen_and_send_sync_uuid(mdev);
1197 /* Do not change the order of the if above and the two below... */
1198 if (os.pdsk == D_DISKLESS &&
1199 ns.pdsk > D_DISKLESS && ns.pdsk != D_UNKNOWN) { /* attach on the peer */
1200 drbd_send_uuids(mdev);
1201 drbd_send_state(mdev);
1203 /* No point in queuing send_bitmap if we don't have a connection
1204 * anymore, so check also the _current_ state, not only the new state
1205 * at the time this work was queued. */
1206 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S &&
1207 mdev->state.conn == C_WF_BITMAP_S)
1208 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL,
1209 "send_bitmap (WFBitMapS)",
1210 BM_LOCKED_TEST_ALLOWED);
1212 /* Lost contact to peer's copy of the data */
1213 if ((os.pdsk >= D_INCONSISTENT &&
1214 os.pdsk != D_UNKNOWN &&
1215 os.pdsk != D_OUTDATED)
1216 && (ns.pdsk < D_INCONSISTENT ||
1217 ns.pdsk == D_UNKNOWN ||
1218 ns.pdsk == D_OUTDATED)) {
1219 if (get_ldev(mdev)) {
1220 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
1221 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1222 if (drbd_suspended(mdev)) {
1223 set_bit(NEW_CUR_UUID, &mdev->flags);
1225 drbd_uuid_new_current(mdev);
1226 drbd_send_uuids(mdev);
1233 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
1234 /* D_DISKLESS Peer becomes secondary */
1235 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
1236 /* We may still be Primary ourselves.
1237 * No harm done if the bitmap still changes,
1238 * redirtied pages will follow later. */
1239 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
1240 "demote diskless peer", BM_LOCKED_SET_ALLOWED);
1244 /* Write out all changed bits on demote.
1245 * Though, no need to da that just yet
1246 * if there is a resync going on still */
1247 if (os.role == R_PRIMARY && ns.role == R_SECONDARY &&
1248 mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) {
1249 /* No changes to the bitmap expected this time, so assert that,
1250 * even though no harm was done if it did change. */
1251 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
1252 "demote", BM_LOCKED_TEST_ALLOWED);
1256 /* Last part of the attaching process ... */
1257 if (ns.conn >= C_CONNECTED &&
1258 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
1259 drbd_send_sizes(mdev, 0, 0); /* to start sync... */
1260 drbd_send_uuids(mdev);
1261 drbd_send_state(mdev);
1264 /* We want to pause/continue resync, tell peer. */
1265 if (ns.conn >= C_CONNECTED &&
1266 ((os.aftr_isp != ns.aftr_isp) ||
1267 (os.user_isp != ns.user_isp)))
1268 drbd_send_state(mdev);
1270 /* In case one of the isp bits got set, suspend other devices. */
1271 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
1272 (ns.aftr_isp || ns.peer_isp || ns.user_isp))
1273 suspend_other_sg(mdev);
1275 /* Make sure the peer gets informed about eventual state
1276 changes (ISP bits) while we were in WFReportParams. */
1277 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
1278 drbd_send_state(mdev);
1280 if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
1281 drbd_send_state(mdev);
1283 /* We are in the progress to start a full sync... */
1284 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
1285 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
1286 /* no other bitmap changes expected during this phase */
1287 drbd_queue_bitmap_io(mdev,
1288 &drbd_bmio_set_n_write, &abw_start_sync,
1289 "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED);
1291 /* We are invalidating our self... */
1292 if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
1293 os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
1294 /* other bitmap operation expected during this phase */
1295 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL,
1296 "set_n_write from invalidate", BM_LOCKED_MASK);
1298 /* first half of local IO error, failure to attach,
1299 * or administrative detach */
1300 if (os.disk != D_FAILED && ns.disk == D_FAILED) {
1301 enum drbd_io_error_p eh;
1303 /* corresponding get_ldev was in __drbd_set_state, to serialize
1304 * our cleanup here with the transition to D_DISKLESS,
1305 * so it is safe to dreference ldev here. */
1307 eh = rcu_dereference(mdev->ldev->disk_conf)->on_io_error;
1309 was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
1311 /* Immediately allow completion of all application IO, that waits
1312 for completion from the local disk. */
1313 tl_abort_disk_io(mdev);
1315 /* current state still has to be D_FAILED,
1316 * there is only one way out: to D_DISKLESS,
1317 * and that may only happen after our put_ldev below. */
1318 if (mdev->state.disk != D_FAILED)
1320 "ASSERT FAILED: disk is %s during detach\n",
1321 drbd_disk_str(mdev->state.disk));
1323 drbd_send_state(mdev);
1324 drbd_rs_cancel_all(mdev);
1326 /* In case we want to get something to stable storage still,
1327 * this may be the last chance.
1328 * Following put_ldev may transition to D_DISKLESS. */
1332 if (was_io_error && eh == EP_CALL_HELPER)
1333 drbd_khelper(mdev, "local-io-error");
1336 /* second half of local IO error, failure to attach,
1337 * or administrative detach,
1338 * after local_cnt references have reached zero again */
1339 if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
1340 /* We must still be diskless,
1341 * re-attach has to be serialized with this! */
1342 if (mdev->state.disk != D_DISKLESS)
1344 "ASSERT FAILED: disk is %s while going diskless\n",
1345 drbd_disk_str(mdev->state.disk));
1348 mdev->rs_failed = 0;
1349 atomic_set(&mdev->rs_pending_cnt, 0);
1351 drbd_send_state(mdev);
1352 /* corresponding get_ldev in __drbd_set_state
1353 * this may finally trigger drbd_ldev_destroy. */
1357 /* Notify peer that I had a local IO error, and did not detached.. */
1358 if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT)
1359 drbd_send_state(mdev);
1361 /* Disks got bigger while they were detached */
1362 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
1363 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
1364 if (ns.conn == C_CONNECTED)
1365 resync_after_online_grow(mdev);
1368 /* A resync finished or aborted, wake paused devices... */
1369 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
1370 (os.peer_isp && !ns.peer_isp) ||
1371 (os.user_isp && !ns.user_isp))
1372 resume_next_sg(mdev);
1374 /* sync target done with resync. Explicitly notify peer, even though
1375 * it should (at least for non-empty resyncs) already know itself. */
1376 if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
1377 drbd_send_state(mdev);
1379 /* This triggers bitmap writeout of potentially still unwritten pages
1380 * if the resync finished cleanly, or aborted because of peer disk
1381 * failure, or because of connection loss.
1382 * For resync aborted because of local disk failure, we cannot do
1383 * any bitmap writeout anymore.
1384 * No harm done if some bits change during this phase.
1386 if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) {
1387 drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL,
1388 "write from resync_finished", BM_LOCKED_SET_ALLOWED);
1392 if (ns.disk == D_DISKLESS &&
1393 ns.conn == C_STANDALONE &&
1394 ns.role == R_SECONDARY) {
1395 if (os.aftr_isp != ns.aftr_isp)
1396 resume_next_sg(mdev);
1402 struct after_conn_state_chg_work {
1405 union drbd_state ns_min;
1406 union drbd_state ns_max; /* new, max state, over all mdevs */
1407 enum chg_state_flags flags;
1410 static int w_after_conn_state_ch(struct drbd_work *w, int unused)
1412 struct after_conn_state_chg_work *acscw =
1413 container_of(w, struct after_conn_state_chg_work, w);
1414 struct drbd_tconn *tconn = w->tconn;
1415 enum drbd_conns oc = acscw->oc;
1416 union drbd_state ns_max = acscw->ns_max;
1417 union drbd_state ns_min = acscw->ns_min;
1418 struct drbd_conf *mdev;
1423 /* Upon network configuration, we need to start the receiver */
1424 if (oc == C_STANDALONE && ns_max.conn == C_UNCONNECTED)
1425 drbd_thread_start(&tconn->receiver);
1427 if (oc == C_DISCONNECTING && ns_max.conn == C_STANDALONE) {
1428 struct net_conf *old_conf;
1430 mutex_lock(&tconn->conf_update);
1431 old_conf = tconn->net_conf;
1432 tconn->my_addr_len = 0;
1433 tconn->peer_addr_len = 0;
1434 rcu_assign_pointer(tconn->net_conf, NULL);
1435 conn_free_crypto(tconn);
1436 mutex_unlock(&tconn->conf_update);
1442 if (ns_max.susp_fen) {
1443 /* case1: The outdate peer handler is successful: */
1444 if (ns_max.pdsk <= D_OUTDATED) {
1447 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1448 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1449 drbd_uuid_new_current(mdev);
1450 clear_bit(NEW_CUR_UUID, &mdev->flags);
1454 conn_request_state(tconn,
1455 (union drbd_state) { { .susp_fen = 1 } },
1456 (union drbd_state) { { .susp_fen = 0 } },
1459 /* case2: The connection was established again: */
1460 if (ns_min.conn >= C_CONNECTED) {
1462 idr_for_each_entry(&tconn->volumes, mdev, vnr)
1463 clear_bit(NEW_CUR_UUID, &mdev->flags);
1465 spin_lock_irq(&tconn->req_lock);
1466 _tl_restart(tconn, RESEND);
1467 _conn_request_state(tconn,
1468 (union drbd_state) { { .susp_fen = 1 } },
1469 (union drbd_state) { { .susp_fen = 0 } },
1471 spin_unlock_irq(&tconn->req_lock);
1474 kref_put(&tconn->kref, &conn_destroy);
1478 void conn_old_common_state(struct drbd_tconn *tconn, union drbd_state *pcs, enum chg_state_flags *pf)
1480 enum chg_state_flags flags = ~0;
1481 struct drbd_conf *mdev;
1482 int vnr, first_vol = 1;
1483 union drbd_dev_state os, cs = {
1484 { .role = R_SECONDARY,
1486 .conn = tconn->cstate,
1492 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1501 if (cs.role != os.role)
1502 flags &= ~CS_DC_ROLE;
1504 if (cs.peer != os.peer)
1505 flags &= ~CS_DC_PEER;
1507 if (cs.conn != os.conn)
1508 flags &= ~CS_DC_CONN;
1510 if (cs.disk != os.disk)
1511 flags &= ~CS_DC_DISK;
1513 if (cs.pdsk != os.pdsk)
1514 flags &= ~CS_DC_PDSK;
1523 static enum drbd_state_rv
1524 conn_is_valid_transition(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1525 enum chg_state_flags flags)
1527 enum drbd_state_rv rv = SS_SUCCESS;
1528 union drbd_state ns, os;
1529 struct drbd_conf *mdev;
1533 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1534 os = drbd_read_state(mdev);
1535 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
1537 if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
1543 rv = is_valid_transition(os, ns);
1544 if (rv < SS_SUCCESS)
1547 if (!(flags & CS_HARD)) {
1548 rv = is_valid_state(mdev, ns);
1549 if (rv < SS_SUCCESS) {
1550 if (is_valid_state(mdev, os) == rv)
1551 rv = is_valid_soft_transition(os, ns);
1553 rv = is_valid_soft_transition(os, ns);
1555 if (rv < SS_SUCCESS)
1560 if (rv < SS_SUCCESS && flags & CS_VERBOSE)
1561 print_st_err(mdev, os, ns, rv);
1567 conn_set_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1568 union drbd_state *pns_min, union drbd_state *pns_max, enum chg_state_flags flags)
1570 union drbd_state ns, os, ns_max = { };
1571 union drbd_state ns_min = {
1578 struct drbd_conf *mdev;
1579 enum drbd_state_rv rv;
1580 int vnr, number_of_volumes = 0;
1582 if (mask.conn == C_MASK)
1583 tconn->cstate = val.conn;
1586 idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1587 number_of_volumes++;
1588 os = drbd_read_state(mdev);
1589 ns = apply_mask_val(os, mask, val);
1590 ns = sanitize_state(mdev, ns, NULL);
1592 if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
1595 rv = __drbd_set_state(mdev, ns, flags, NULL);
1596 if (rv < SS_SUCCESS)
1599 ns.i = mdev->state.i;
1600 ns_max.role = max_role(ns.role, ns_max.role);
1601 ns_max.peer = max_role(ns.peer, ns_max.peer);
1602 ns_max.conn = max_t(enum drbd_conns, ns.conn, ns_max.conn);
1603 ns_max.disk = max_t(enum drbd_disk_state, ns.disk, ns_max.disk);
1604 ns_max.pdsk = max_t(enum drbd_disk_state, ns.pdsk, ns_max.pdsk);
1606 ns_min.role = min_role(ns.role, ns_min.role);
1607 ns_min.peer = min_role(ns.peer, ns_min.peer);
1608 ns_min.conn = min_t(enum drbd_conns, ns.conn, ns_min.conn);
1609 ns_min.disk = min_t(enum drbd_disk_state, ns.disk, ns_min.disk);
1610 ns_min.pdsk = min_t(enum drbd_disk_state, ns.pdsk, ns_min.pdsk);
1614 if (number_of_volumes == 0) {
1615 ns_min = ns_max = (union drbd_state) { {
1616 .role = R_SECONDARY,
1624 ns_min.susp = ns_max.susp = tconn->susp;
1625 ns_min.susp_nod = ns_max.susp_nod = tconn->susp_nod;
1626 ns_min.susp_fen = ns_max.susp_fen = tconn->susp_fen;
1632 static enum drbd_state_rv
1633 _conn_rq_cond(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val)
1635 enum drbd_state_rv rv;
1637 if (test_and_clear_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags))
1638 return SS_CW_SUCCESS;
1640 if (test_and_clear_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags))
1641 return SS_CW_FAILED_BY_PEER;
1643 spin_lock_irq(&tconn->req_lock);
1644 rv = tconn->cstate != C_WF_REPORT_PARAMS ? SS_CW_NO_NEED : SS_UNKNOWN_ERROR;
1646 if (rv == SS_UNKNOWN_ERROR)
1647 rv = conn_is_valid_transition(tconn, mask, val, 0);
1649 if (rv == SS_SUCCESS)
1650 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
1652 spin_unlock_irq(&tconn->req_lock);
1657 static enum drbd_state_rv
1658 conn_cl_wide(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1659 enum chg_state_flags f)
1661 enum drbd_state_rv rv;
1663 spin_unlock_irq(&tconn->req_lock);
1664 mutex_lock(&tconn->cstate_mutex);
1666 if (conn_send_state_req(tconn, mask, val)) {
1667 rv = SS_CW_FAILED_BY_PEER;
1668 /* if (f & CS_VERBOSE)
1669 print_st_err(mdev, os, ns, rv); */
1673 wait_event(tconn->ping_wait, (rv = _conn_rq_cond(tconn, mask, val)));
1676 mutex_unlock(&tconn->cstate_mutex);
1677 spin_lock_irq(&tconn->req_lock);
1683 _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1684 enum chg_state_flags flags)
1686 enum drbd_state_rv rv = SS_SUCCESS;
1687 struct after_conn_state_chg_work *acscw;
1688 enum drbd_conns oc = tconn->cstate;
1689 union drbd_state ns_max, ns_min, os;
1691 rv = is_valid_conn_transition(oc, val.conn);
1692 if (rv < SS_SUCCESS)
1695 rv = conn_is_valid_transition(tconn, mask, val, flags);
1696 if (rv < SS_SUCCESS)
1699 if (oc == C_WF_REPORT_PARAMS && val.conn == C_DISCONNECTING &&
1700 !(flags & (CS_LOCAL_ONLY | CS_HARD))) {
1701 rv = conn_cl_wide(tconn, mask, val, flags);
1702 if (rv < SS_SUCCESS)
1706 conn_old_common_state(tconn, &os, &flags);
1707 flags |= CS_DC_SUSP;
1708 conn_set_state(tconn, mask, val, &ns_min, &ns_max, flags);
1709 conn_pr_state_change(tconn, os, ns_max, flags);
1711 acscw = kmalloc(sizeof(*acscw), GFP_ATOMIC);
1713 acscw->oc = os.conn;
1714 acscw->ns_min = ns_min;
1715 acscw->ns_max = ns_max;
1716 acscw->flags = flags;
1717 acscw->w.cb = w_after_conn_state_ch;
1718 kref_get(&tconn->kref);
1719 acscw->w.tconn = tconn;
1720 drbd_queue_work(&tconn->data.work, &acscw->w);
1722 conn_err(tconn, "Could not kmalloc an acscw\n");
1730 conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
1731 enum chg_state_flags flags)
1733 enum drbd_state_rv rv;
1735 spin_lock_irq(&tconn->req_lock);
1736 rv = _conn_request_state(tconn, mask, val, flags);
1737 spin_unlock_irq(&tconn->req_lock);