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b8907339 PR |
1 | /* |
2 | drbd_state.c | |
3 | ||
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | ||
6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
9 | ||
10 | Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev | |
11 | from Logicworks, Inc. for making SDP replication support possible. | |
12 | ||
13 | drbd is free software; you can redistribute it and/or modify | |
14 | it under the terms of the GNU General Public License as published by | |
15 | the Free Software Foundation; either version 2, or (at your option) | |
16 | any later version. | |
17 | ||
18 | drbd is distributed in the hope that it will be useful, | |
19 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | GNU General Public License for more details. | |
22 | ||
23 | You should have received a copy of the GNU General Public License | |
24 | along with drbd; see the file COPYING. If not, write to | |
25 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | */ | |
27 | ||
28 | #include <linux/drbd_limits.h> | |
29 | #include "drbd_int.h" | |
30 | #include "drbd_req.h" | |
31 | ||
32 | struct after_state_chg_work { | |
33 | struct drbd_work w; | |
34 | union drbd_state os; | |
35 | union drbd_state ns; | |
36 | enum chg_state_flags flags; | |
37 | struct completion *done; | |
38 | }; | |
39 | ||
40 | ||
41 | extern void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what); | |
42 | int drbd_send_state_req(struct drbd_conf *, union drbd_state, union drbd_state); | |
00d56944 | 43 | static int w_after_state_ch(struct drbd_work *w, int unused); |
b8907339 PR |
44 | static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, |
45 | union drbd_state ns, enum chg_state_flags flags); | |
46 | static void after_conn_state_ch(struct drbd_tconn *tconn, union drbd_state os, | |
47 | union drbd_state ns, enum chg_state_flags flags); | |
a75f34ad PR |
48 | static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state); |
49 | static enum drbd_state_rv is_valid_soft_transition(union drbd_state, union drbd_state); | |
50 | static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os, | |
51 | union drbd_state ns, const char **warn_sync_abort); | |
b8907339 PR |
52 | |
53 | /** | |
54 | * cl_wide_st_chg() - true if the state change is a cluster wide one | |
55 | * @mdev: DRBD device. | |
56 | * @os: old (current) state. | |
57 | * @ns: new (wanted) state. | |
58 | */ | |
59 | static int cl_wide_st_chg(struct drbd_conf *mdev, | |
60 | union drbd_state os, union drbd_state ns) | |
61 | { | |
62 | return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED && | |
63 | ((os.role != R_PRIMARY && ns.role == R_PRIMARY) || | |
64 | (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || | |
65 | (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) || | |
66 | (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) || | |
67 | (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) || | |
68 | (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S); | |
69 | } | |
70 | ||
71 | enum drbd_state_rv | |
72 | drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f, | |
73 | union drbd_state mask, union drbd_state val) | |
74 | { | |
75 | unsigned long flags; | |
76 | union drbd_state os, ns; | |
77 | enum drbd_state_rv rv; | |
78 | ||
79 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
80 | os = mdev->state; | |
81 | ns.i = (os.i & ~mask.i) | val.i; | |
82 | rv = _drbd_set_state(mdev, ns, f, NULL); | |
83 | ns = mdev->state; | |
84 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
85 | ||
86 | return rv; | |
87 | } | |
88 | ||
89 | /** | |
90 | * drbd_force_state() - Impose a change which happens outside our control on our state | |
91 | * @mdev: DRBD device. | |
92 | * @mask: mask of state bits to change. | |
93 | * @val: value of new state bits. | |
94 | */ | |
95 | void drbd_force_state(struct drbd_conf *mdev, | |
96 | union drbd_state mask, union drbd_state val) | |
97 | { | |
98 | drbd_change_state(mdev, CS_HARD, mask, val); | |
99 | } | |
100 | ||
101 | static enum drbd_state_rv | |
102 | _req_st_cond(struct drbd_conf *mdev, union drbd_state mask, | |
103 | union drbd_state val) | |
104 | { | |
105 | union drbd_state os, ns; | |
106 | unsigned long flags; | |
107 | enum drbd_state_rv rv; | |
108 | ||
109 | if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags)) | |
110 | return SS_CW_SUCCESS; | |
111 | ||
112 | if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags)) | |
113 | return SS_CW_FAILED_BY_PEER; | |
114 | ||
115 | rv = 0; | |
116 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
117 | os = mdev->state; | |
118 | ns.i = (os.i & ~mask.i) | val.i; | |
119 | ns = sanitize_state(mdev, os, ns, NULL); | |
120 | ||
121 | if (!cl_wide_st_chg(mdev, os, ns)) | |
122 | rv = SS_CW_NO_NEED; | |
123 | if (!rv) { | |
124 | rv = is_valid_state(mdev, ns); | |
125 | if (rv == SS_SUCCESS) { | |
a75f34ad | 126 | rv = is_valid_soft_transition(os, ns); |
b8907339 PR |
127 | if (rv == SS_SUCCESS) |
128 | rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ | |
129 | } | |
130 | } | |
131 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
132 | ||
133 | return rv; | |
134 | } | |
135 | ||
136 | /** | |
137 | * drbd_req_state() - Perform an eventually cluster wide state change | |
138 | * @mdev: DRBD device. | |
139 | * @mask: mask of state bits to change. | |
140 | * @val: value of new state bits. | |
141 | * @f: flags | |
142 | * | |
143 | * Should not be called directly, use drbd_request_state() or | |
144 | * _drbd_request_state(). | |
145 | */ | |
146 | static enum drbd_state_rv | |
147 | drbd_req_state(struct drbd_conf *mdev, union drbd_state mask, | |
148 | union drbd_state val, enum chg_state_flags f) | |
149 | { | |
150 | struct completion done; | |
151 | unsigned long flags; | |
152 | union drbd_state os, ns; | |
153 | enum drbd_state_rv rv; | |
154 | ||
155 | init_completion(&done); | |
156 | ||
157 | if (f & CS_SERIALIZE) | |
158 | mutex_lock(&mdev->state_mutex); | |
159 | ||
160 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
161 | os = mdev->state; | |
162 | ns.i = (os.i & ~mask.i) | val.i; | |
163 | ||
164 | ns = sanitize_state(mdev, os, ns, NULL); | |
165 | ||
166 | if (cl_wide_st_chg(mdev, os, ns)) { | |
167 | rv = is_valid_state(mdev, ns); | |
168 | if (rv == SS_SUCCESS) | |
a75f34ad | 169 | rv = is_valid_soft_transition(os, ns); |
b8907339 PR |
170 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
171 | ||
172 | if (rv < SS_SUCCESS) { | |
173 | if (f & CS_VERBOSE) | |
174 | print_st_err(mdev, os, ns, rv); | |
175 | goto abort; | |
176 | } | |
177 | ||
178 | drbd_state_lock(mdev); | |
179 | if (!drbd_send_state_req(mdev, mask, val)) { | |
180 | drbd_state_unlock(mdev); | |
181 | rv = SS_CW_FAILED_BY_PEER; | |
182 | if (f & CS_VERBOSE) | |
183 | print_st_err(mdev, os, ns, rv); | |
184 | goto abort; | |
185 | } | |
186 | ||
187 | wait_event(mdev->state_wait, | |
188 | (rv = _req_st_cond(mdev, mask, val))); | |
189 | ||
190 | if (rv < SS_SUCCESS) { | |
191 | drbd_state_unlock(mdev); | |
192 | if (f & CS_VERBOSE) | |
193 | print_st_err(mdev, os, ns, rv); | |
194 | goto abort; | |
195 | } | |
196 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
197 | os = mdev->state; | |
198 | ns.i = (os.i & ~mask.i) | val.i; | |
199 | rv = _drbd_set_state(mdev, ns, f, &done); | |
200 | drbd_state_unlock(mdev); | |
201 | } else { | |
202 | rv = _drbd_set_state(mdev, ns, f, &done); | |
203 | } | |
204 | ||
205 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
206 | ||
207 | if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) { | |
208 | D_ASSERT(current != mdev->tconn->worker.task); | |
209 | wait_for_completion(&done); | |
210 | } | |
211 | ||
212 | abort: | |
213 | if (f & CS_SERIALIZE) | |
214 | mutex_unlock(&mdev->state_mutex); | |
215 | ||
216 | return rv; | |
217 | } | |
218 | ||
219 | /** | |
220 | * _drbd_request_state() - Request a state change (with flags) | |
221 | * @mdev: DRBD device. | |
222 | * @mask: mask of state bits to change. | |
223 | * @val: value of new state bits. | |
224 | * @f: flags | |
225 | * | |
226 | * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE | |
227 | * flag, or when logging of failed state change requests is not desired. | |
228 | */ | |
229 | enum drbd_state_rv | |
230 | _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask, | |
231 | union drbd_state val, enum chg_state_flags f) | |
232 | { | |
233 | enum drbd_state_rv rv; | |
234 | ||
235 | wait_event(mdev->state_wait, | |
236 | (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE); | |
237 | ||
238 | return rv; | |
239 | } | |
240 | ||
241 | static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns) | |
242 | { | |
243 | dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c%c%c }\n", | |
244 | name, | |
245 | drbd_conn_str(ns.conn), | |
246 | drbd_role_str(ns.role), | |
247 | drbd_role_str(ns.peer), | |
248 | drbd_disk_str(ns.disk), | |
249 | drbd_disk_str(ns.pdsk), | |
250 | is_susp(ns) ? 's' : 'r', | |
251 | ns.aftr_isp ? 'a' : '-', | |
252 | ns.peer_isp ? 'p' : '-', | |
253 | ns.user_isp ? 'u' : '-', | |
254 | ns.susp_fen ? 'F' : '-', | |
255 | ns.susp_nod ? 'N' : '-' | |
256 | ); | |
257 | } | |
258 | ||
259 | void print_st_err(struct drbd_conf *mdev, union drbd_state os, | |
260 | union drbd_state ns, enum drbd_state_rv err) | |
261 | { | |
262 | if (err == SS_IN_TRANSIENT_STATE) | |
263 | return; | |
264 | dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err)); | |
265 | print_st(mdev, " state", os); | |
266 | print_st(mdev, "wanted", ns); | |
267 | } | |
268 | ||
269 | ||
270 | /** | |
271 | * is_valid_state() - Returns an SS_ error code if ns is not valid | |
272 | * @mdev: DRBD device. | |
273 | * @ns: State to consider. | |
274 | */ | |
275 | static enum drbd_state_rv | |
276 | is_valid_state(struct drbd_conf *mdev, union drbd_state ns) | |
277 | { | |
278 | /* See drbd_state_sw_errors in drbd_strings.c */ | |
279 | ||
280 | enum drbd_fencing_p fp; | |
281 | enum drbd_state_rv rv = SS_SUCCESS; | |
282 | ||
283 | fp = FP_DONT_CARE; | |
284 | if (get_ldev(mdev)) { | |
285 | fp = mdev->ldev->dc.fencing; | |
286 | put_ldev(mdev); | |
287 | } | |
288 | ||
289 | if (get_net_conf(mdev->tconn)) { | |
290 | if (!mdev->tconn->net_conf->two_primaries && | |
291 | ns.role == R_PRIMARY && ns.peer == R_PRIMARY) | |
292 | rv = SS_TWO_PRIMARIES; | |
293 | put_net_conf(mdev->tconn); | |
294 | } | |
295 | ||
296 | if (rv <= 0) | |
297 | /* already found a reason to abort */; | |
298 | else if (ns.role == R_SECONDARY && mdev->open_cnt) | |
299 | rv = SS_DEVICE_IN_USE; | |
300 | ||
301 | else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE) | |
302 | rv = SS_NO_UP_TO_DATE_DISK; | |
303 | ||
304 | else if (fp >= FP_RESOURCE && | |
305 | ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN) | |
306 | rv = SS_PRIMARY_NOP; | |
307 | ||
308 | else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT) | |
309 | rv = SS_NO_UP_TO_DATE_DISK; | |
310 | ||
311 | else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT) | |
312 | rv = SS_NO_LOCAL_DISK; | |
313 | ||
314 | else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT) | |
315 | rv = SS_NO_REMOTE_DISK; | |
316 | ||
317 | else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) | |
318 | rv = SS_NO_UP_TO_DATE_DISK; | |
319 | ||
320 | else if ((ns.conn == C_CONNECTED || | |
321 | ns.conn == C_WF_BITMAP_S || | |
322 | ns.conn == C_SYNC_SOURCE || | |
323 | ns.conn == C_PAUSED_SYNC_S) && | |
324 | ns.disk == D_OUTDATED) | |
325 | rv = SS_CONNECTED_OUTDATES; | |
326 | ||
327 | else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
328 | (mdev->sync_conf.verify_alg[0] == 0)) | |
329 | rv = SS_NO_VERIFY_ALG; | |
330 | ||
331 | else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
332 | mdev->tconn->agreed_pro_version < 88) | |
333 | rv = SS_NOT_SUPPORTED; | |
334 | ||
335 | else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN) | |
336 | rv = SS_CONNECTED_OUTDATES; | |
337 | ||
338 | return rv; | |
339 | } | |
340 | ||
341 | /** | |
a75f34ad | 342 | * is_valid_soft_transition() - Returns an SS_ error code if the state transition is not possible |
b8907339 PR |
343 | * @mdev: DRBD device. |
344 | * @ns: new state. | |
345 | * @os: old state. | |
346 | */ | |
347 | static enum drbd_state_rv | |
a75f34ad | 348 | is_valid_soft_transition(union drbd_state os, union drbd_state ns) |
b8907339 PR |
349 | { |
350 | enum drbd_state_rv rv = SS_SUCCESS; | |
351 | ||
352 | if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) && | |
353 | os.conn > C_CONNECTED) | |
354 | rv = SS_RESYNC_RUNNING; | |
355 | ||
356 | if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE) | |
357 | rv = SS_ALREADY_STANDALONE; | |
358 | ||
359 | if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS) | |
360 | rv = SS_IS_DISKLESS; | |
361 | ||
362 | if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED) | |
363 | rv = SS_NO_NET_CONFIG; | |
364 | ||
365 | if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING) | |
366 | rv = SS_LOWER_THAN_OUTDATED; | |
367 | ||
368 | if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED) | |
369 | rv = SS_IN_TRANSIENT_STATE; | |
370 | ||
371 | if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS) | |
372 | rv = SS_IN_TRANSIENT_STATE; | |
373 | ||
374 | if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED) | |
375 | rv = SS_NEED_CONNECTION; | |
376 | ||
377 | if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
378 | ns.conn != os.conn && os.conn > C_CONNECTED) | |
379 | rv = SS_RESYNC_RUNNING; | |
380 | ||
381 | if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) && | |
382 | os.conn < C_CONNECTED) | |
383 | rv = SS_NEED_CONNECTION; | |
384 | ||
385 | if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE) | |
386 | && os.conn < C_WF_REPORT_PARAMS) | |
387 | rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */ | |
388 | ||
389 | return rv; | |
390 | } | |
391 | ||
392 | /** | |
393 | * sanitize_state() - Resolves implicitly necessary additional changes to a state transition | |
394 | * @mdev: DRBD device. | |
395 | * @os: old state. | |
396 | * @ns: new state. | |
397 | * @warn_sync_abort: | |
398 | * | |
399 | * When we loose connection, we have to set the state of the peers disk (pdsk) | |
400 | * to D_UNKNOWN. This rule and many more along those lines are in this function. | |
401 | */ | |
402 | static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os, | |
403 | union drbd_state ns, const char **warn_sync_abort) | |
404 | { | |
405 | enum drbd_fencing_p fp; | |
406 | enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max; | |
407 | ||
408 | fp = FP_DONT_CARE; | |
409 | if (get_ldev(mdev)) { | |
410 | fp = mdev->ldev->dc.fencing; | |
411 | put_ldev(mdev); | |
412 | } | |
413 | ||
414 | /* Disallow Network errors to configure a device's network part */ | |
415 | if ((ns.conn >= C_TIMEOUT && ns.conn <= C_TEAR_DOWN) && | |
416 | os.conn <= C_DISCONNECTING) | |
417 | ns.conn = os.conn; | |
418 | ||
419 | /* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow. | |
420 | * If you try to go into some Sync* state, that shall fail (elsewhere). */ | |
421 | if (os.conn >= C_TIMEOUT && os.conn <= C_TEAR_DOWN && | |
422 | ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING && ns.conn <= C_TEAR_DOWN) | |
423 | ns.conn = os.conn; | |
424 | ||
425 | /* we cannot fail (again) if we already detached */ | |
426 | if (ns.disk == D_FAILED && os.disk == D_DISKLESS) | |
427 | ns.disk = D_DISKLESS; | |
428 | ||
429 | /* if we are only D_ATTACHING yet, | |
430 | * we can (and should) go directly to D_DISKLESS. */ | |
431 | if (ns.disk == D_FAILED && os.disk == D_ATTACHING) | |
432 | ns.disk = D_DISKLESS; | |
433 | ||
434 | /* After C_DISCONNECTING only C_STANDALONE may follow */ | |
435 | if (os.conn == C_DISCONNECTING && ns.conn != C_STANDALONE) | |
436 | ns.conn = os.conn; | |
437 | ||
438 | if (ns.conn < C_CONNECTED) { | |
439 | ns.peer_isp = 0; | |
440 | ns.peer = R_UNKNOWN; | |
441 | if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT) | |
442 | ns.pdsk = D_UNKNOWN; | |
443 | } | |
444 | ||
445 | /* Clear the aftr_isp when becoming unconfigured */ | |
446 | if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY) | |
447 | ns.aftr_isp = 0; | |
448 | ||
449 | /* Abort resync if a disk fails/detaches */ | |
450 | if (os.conn > C_CONNECTED && ns.conn > C_CONNECTED && | |
451 | (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) { | |
452 | if (warn_sync_abort) | |
453 | *warn_sync_abort = | |
454 | os.conn == C_VERIFY_S || os.conn == C_VERIFY_T ? | |
455 | "Online-verify" : "Resync"; | |
456 | ns.conn = C_CONNECTED; | |
457 | } | |
458 | ||
459 | /* Connection breaks down before we finished "Negotiating" */ | |
460 | if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING && | |
461 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
462 | if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) { | |
463 | ns.disk = mdev->new_state_tmp.disk; | |
464 | ns.pdsk = mdev->new_state_tmp.pdsk; | |
465 | } else { | |
466 | dev_alert(DEV, "Connection lost while negotiating, no data!\n"); | |
467 | ns.disk = D_DISKLESS; | |
468 | ns.pdsk = D_UNKNOWN; | |
469 | } | |
470 | put_ldev(mdev); | |
471 | } | |
472 | ||
473 | /* D_CONSISTENT and D_OUTDATED vanish when we get connected */ | |
474 | if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) { | |
475 | if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED) | |
476 | ns.disk = D_UP_TO_DATE; | |
477 | if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED) | |
478 | ns.pdsk = D_UP_TO_DATE; | |
479 | } | |
480 | ||
481 | /* Implications of the connection stat on the disk states */ | |
482 | disk_min = D_DISKLESS; | |
483 | disk_max = D_UP_TO_DATE; | |
484 | pdsk_min = D_INCONSISTENT; | |
485 | pdsk_max = D_UNKNOWN; | |
486 | switch ((enum drbd_conns)ns.conn) { | |
487 | case C_WF_BITMAP_T: | |
488 | case C_PAUSED_SYNC_T: | |
489 | case C_STARTING_SYNC_T: | |
490 | case C_WF_SYNC_UUID: | |
491 | case C_BEHIND: | |
492 | disk_min = D_INCONSISTENT; | |
493 | disk_max = D_OUTDATED; | |
494 | pdsk_min = D_UP_TO_DATE; | |
495 | pdsk_max = D_UP_TO_DATE; | |
496 | break; | |
497 | case C_VERIFY_S: | |
498 | case C_VERIFY_T: | |
499 | disk_min = D_UP_TO_DATE; | |
500 | disk_max = D_UP_TO_DATE; | |
501 | pdsk_min = D_UP_TO_DATE; | |
502 | pdsk_max = D_UP_TO_DATE; | |
503 | break; | |
504 | case C_CONNECTED: | |
505 | disk_min = D_DISKLESS; | |
506 | disk_max = D_UP_TO_DATE; | |
507 | pdsk_min = D_DISKLESS; | |
508 | pdsk_max = D_UP_TO_DATE; | |
509 | break; | |
510 | case C_WF_BITMAP_S: | |
511 | case C_PAUSED_SYNC_S: | |
512 | case C_STARTING_SYNC_S: | |
513 | case C_AHEAD: | |
514 | disk_min = D_UP_TO_DATE; | |
515 | disk_max = D_UP_TO_DATE; | |
516 | pdsk_min = D_INCONSISTENT; | |
517 | pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/ | |
518 | break; | |
519 | case C_SYNC_TARGET: | |
520 | disk_min = D_INCONSISTENT; | |
521 | disk_max = D_INCONSISTENT; | |
522 | pdsk_min = D_UP_TO_DATE; | |
523 | pdsk_max = D_UP_TO_DATE; | |
524 | break; | |
525 | case C_SYNC_SOURCE: | |
526 | disk_min = D_UP_TO_DATE; | |
527 | disk_max = D_UP_TO_DATE; | |
528 | pdsk_min = D_INCONSISTENT; | |
529 | pdsk_max = D_INCONSISTENT; | |
530 | break; | |
531 | case C_STANDALONE: | |
532 | case C_DISCONNECTING: | |
533 | case C_UNCONNECTED: | |
534 | case C_TIMEOUT: | |
535 | case C_BROKEN_PIPE: | |
536 | case C_NETWORK_FAILURE: | |
537 | case C_PROTOCOL_ERROR: | |
538 | case C_TEAR_DOWN: | |
539 | case C_WF_CONNECTION: | |
540 | case C_WF_REPORT_PARAMS: | |
541 | case C_MASK: | |
542 | break; | |
543 | } | |
544 | if (ns.disk > disk_max) | |
545 | ns.disk = disk_max; | |
546 | ||
547 | if (ns.disk < disk_min) { | |
548 | dev_warn(DEV, "Implicitly set disk from %s to %s\n", | |
549 | drbd_disk_str(ns.disk), drbd_disk_str(disk_min)); | |
550 | ns.disk = disk_min; | |
551 | } | |
552 | if (ns.pdsk > pdsk_max) | |
553 | ns.pdsk = pdsk_max; | |
554 | ||
555 | if (ns.pdsk < pdsk_min) { | |
556 | dev_warn(DEV, "Implicitly set pdsk from %s to %s\n", | |
557 | drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min)); | |
558 | ns.pdsk = pdsk_min; | |
559 | } | |
560 | ||
561 | if (fp == FP_STONITH && | |
562 | (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED) && | |
563 | !(os.role == R_PRIMARY && os.conn < C_CONNECTED && os.pdsk > D_OUTDATED)) | |
564 | ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */ | |
565 | ||
566 | if (mdev->sync_conf.on_no_data == OND_SUSPEND_IO && | |
567 | (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) && | |
568 | !(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE)) | |
569 | ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */ | |
570 | ||
571 | if (ns.aftr_isp || ns.peer_isp || ns.user_isp) { | |
572 | if (ns.conn == C_SYNC_SOURCE) | |
573 | ns.conn = C_PAUSED_SYNC_S; | |
574 | if (ns.conn == C_SYNC_TARGET) | |
575 | ns.conn = C_PAUSED_SYNC_T; | |
576 | } else { | |
577 | if (ns.conn == C_PAUSED_SYNC_S) | |
578 | ns.conn = C_SYNC_SOURCE; | |
579 | if (ns.conn == C_PAUSED_SYNC_T) | |
580 | ns.conn = C_SYNC_TARGET; | |
581 | } | |
582 | ||
583 | return ns; | |
584 | } | |
585 | ||
586 | void drbd_resume_al(struct drbd_conf *mdev) | |
587 | { | |
588 | if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags)) | |
589 | dev_info(DEV, "Resumed AL updates\n"); | |
590 | } | |
591 | ||
592 | /* helper for __drbd_set_state */ | |
593 | static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs) | |
594 | { | |
595 | if (mdev->tconn->agreed_pro_version < 90) | |
596 | mdev->ov_start_sector = 0; | |
597 | mdev->rs_total = drbd_bm_bits(mdev); | |
598 | mdev->ov_position = 0; | |
599 | if (cs == C_VERIFY_T) { | |
600 | /* starting online verify from an arbitrary position | |
601 | * does not fit well into the existing protocol. | |
602 | * on C_VERIFY_T, we initialize ov_left and friends | |
603 | * implicitly in receive_DataRequest once the | |
604 | * first P_OV_REQUEST is received */ | |
605 | mdev->ov_start_sector = ~(sector_t)0; | |
606 | } else { | |
607 | unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector); | |
608 | if (bit >= mdev->rs_total) { | |
609 | mdev->ov_start_sector = | |
610 | BM_BIT_TO_SECT(mdev->rs_total - 1); | |
611 | mdev->rs_total = 1; | |
612 | } else | |
613 | mdev->rs_total -= bit; | |
614 | mdev->ov_position = mdev->ov_start_sector; | |
615 | } | |
616 | mdev->ov_left = mdev->rs_total; | |
617 | } | |
618 | ||
619 | /** | |
620 | * __drbd_set_state() - Set a new DRBD state | |
621 | * @mdev: DRBD device. | |
622 | * @ns: new state. | |
623 | * @flags: Flags | |
624 | * @done: Optional completion, that will get completed after the after_state_ch() finished | |
625 | * | |
626 | * Caller needs to hold req_lock, and global_state_lock. Do not call directly. | |
627 | */ | |
628 | enum drbd_state_rv | |
629 | __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns, | |
630 | enum chg_state_flags flags, struct completion *done) | |
631 | { | |
632 | union drbd_state os; | |
633 | enum drbd_state_rv rv = SS_SUCCESS; | |
634 | const char *warn_sync_abort = NULL; | |
635 | struct after_state_chg_work *ascw; | |
636 | ||
637 | os = mdev->state; | |
638 | ||
639 | ns = sanitize_state(mdev, os, ns, &warn_sync_abort); | |
640 | ||
641 | if (ns.i == os.i) | |
642 | return SS_NOTHING_TO_DO; | |
643 | ||
644 | if (!(flags & CS_HARD)) { | |
645 | /* pre-state-change checks ; only look at ns */ | |
646 | /* See drbd_state_sw_errors in drbd_strings.c */ | |
647 | ||
648 | rv = is_valid_state(mdev, ns); | |
649 | if (rv < SS_SUCCESS) { | |
650 | /* If the old state was illegal as well, then let | |
651 | this happen...*/ | |
652 | ||
653 | if (is_valid_state(mdev, os) == rv) | |
a75f34ad | 654 | rv = is_valid_soft_transition(os, ns); |
b8907339 | 655 | } else |
a75f34ad | 656 | rv = is_valid_soft_transition(os, ns); |
b8907339 PR |
657 | } |
658 | ||
659 | if (rv < SS_SUCCESS) { | |
660 | if (flags & CS_VERBOSE) | |
661 | print_st_err(mdev, os, ns, rv); | |
662 | return rv; | |
663 | } | |
664 | ||
665 | if (warn_sync_abort) | |
666 | dev_warn(DEV, "%s aborted.\n", warn_sync_abort); | |
667 | ||
668 | { | |
669 | char *pbp, pb[300]; | |
670 | pbp = pb; | |
671 | *pbp = 0; | |
672 | if (ns.role != os.role) | |
673 | pbp += sprintf(pbp, "role( %s -> %s ) ", | |
674 | drbd_role_str(os.role), | |
675 | drbd_role_str(ns.role)); | |
676 | if (ns.peer != os.peer) | |
677 | pbp += sprintf(pbp, "peer( %s -> %s ) ", | |
678 | drbd_role_str(os.peer), | |
679 | drbd_role_str(ns.peer)); | |
680 | if (ns.conn != os.conn) | |
681 | pbp += sprintf(pbp, "conn( %s -> %s ) ", | |
682 | drbd_conn_str(os.conn), | |
683 | drbd_conn_str(ns.conn)); | |
684 | if (ns.disk != os.disk) | |
685 | pbp += sprintf(pbp, "disk( %s -> %s ) ", | |
686 | drbd_disk_str(os.disk), | |
687 | drbd_disk_str(ns.disk)); | |
688 | if (ns.pdsk != os.pdsk) | |
689 | pbp += sprintf(pbp, "pdsk( %s -> %s ) ", | |
690 | drbd_disk_str(os.pdsk), | |
691 | drbd_disk_str(ns.pdsk)); | |
692 | if (is_susp(ns) != is_susp(os)) | |
693 | pbp += sprintf(pbp, "susp( %d -> %d ) ", | |
694 | is_susp(os), | |
695 | is_susp(ns)); | |
696 | if (ns.aftr_isp != os.aftr_isp) | |
697 | pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ", | |
698 | os.aftr_isp, | |
699 | ns.aftr_isp); | |
700 | if (ns.peer_isp != os.peer_isp) | |
701 | pbp += sprintf(pbp, "peer_isp( %d -> %d ) ", | |
702 | os.peer_isp, | |
703 | ns.peer_isp); | |
704 | if (ns.user_isp != os.user_isp) | |
705 | pbp += sprintf(pbp, "user_isp( %d -> %d ) ", | |
706 | os.user_isp, | |
707 | ns.user_isp); | |
708 | dev_info(DEV, "%s\n", pb); | |
709 | } | |
710 | ||
711 | /* solve the race between becoming unconfigured, | |
712 | * worker doing the cleanup, and | |
713 | * admin reconfiguring us: | |
714 | * on (re)configure, first set CONFIG_PENDING, | |
715 | * then wait for a potentially exiting worker, | |
716 | * start the worker, and schedule one no_op. | |
717 | * then proceed with configuration. | |
718 | */ | |
719 | if (ns.disk == D_DISKLESS && | |
720 | ns.conn == C_STANDALONE && | |
721 | ns.role == R_SECONDARY && | |
722 | !test_and_set_bit(CONFIG_PENDING, &mdev->flags)) | |
723 | set_bit(DEVICE_DYING, &mdev->flags); | |
724 | ||
725 | /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference | |
726 | * on the ldev here, to be sure the transition -> D_DISKLESS resp. | |
727 | * drbd_ldev_destroy() won't happen before our corresponding | |
728 | * after_state_ch works run, where we put_ldev again. */ | |
729 | if ((os.disk != D_FAILED && ns.disk == D_FAILED) || | |
730 | (os.disk != D_DISKLESS && ns.disk == D_DISKLESS)) | |
731 | atomic_inc(&mdev->local_cnt); | |
732 | ||
733 | mdev->state = ns; | |
734 | ||
735 | if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING) | |
736 | drbd_print_uuids(mdev, "attached to UUIDs"); | |
737 | ||
738 | wake_up(&mdev->misc_wait); | |
739 | wake_up(&mdev->state_wait); | |
2a67d8b9 | 740 | wake_up(&mdev->tconn->ping_wait); |
b8907339 PR |
741 | |
742 | /* aborted verify run. log the last position */ | |
743 | if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) && | |
744 | ns.conn < C_CONNECTED) { | |
745 | mdev->ov_start_sector = | |
746 | BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left); | |
747 | dev_info(DEV, "Online Verify reached sector %llu\n", | |
748 | (unsigned long long)mdev->ov_start_sector); | |
749 | } | |
750 | ||
751 | if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) && | |
752 | (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) { | |
753 | dev_info(DEV, "Syncer continues.\n"); | |
754 | mdev->rs_paused += (long)jiffies | |
755 | -(long)mdev->rs_mark_time[mdev->rs_last_mark]; | |
756 | if (ns.conn == C_SYNC_TARGET) | |
757 | mod_timer(&mdev->resync_timer, jiffies); | |
758 | } | |
759 | ||
760 | if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) && | |
761 | (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) { | |
762 | dev_info(DEV, "Resync suspended\n"); | |
763 | mdev->rs_mark_time[mdev->rs_last_mark] = jiffies; | |
764 | } | |
765 | ||
766 | if (os.conn == C_CONNECTED && | |
767 | (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) { | |
768 | unsigned long now = jiffies; | |
769 | int i; | |
770 | ||
771 | set_ov_position(mdev, ns.conn); | |
772 | mdev->rs_start = now; | |
773 | mdev->rs_last_events = 0; | |
774 | mdev->rs_last_sect_ev = 0; | |
775 | mdev->ov_last_oos_size = 0; | |
776 | mdev->ov_last_oos_start = 0; | |
777 | ||
778 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { | |
779 | mdev->rs_mark_left[i] = mdev->ov_left; | |
780 | mdev->rs_mark_time[i] = now; | |
781 | } | |
782 | ||
783 | drbd_rs_controller_reset(mdev); | |
784 | ||
785 | if (ns.conn == C_VERIFY_S) { | |
786 | dev_info(DEV, "Starting Online Verify from sector %llu\n", | |
787 | (unsigned long long)mdev->ov_position); | |
788 | mod_timer(&mdev->resync_timer, jiffies); | |
789 | } | |
790 | } | |
791 | ||
792 | if (get_ldev(mdev)) { | |
793 | u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND| | |
794 | MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE| | |
795 | MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY); | |
796 | ||
797 | if (test_bit(CRASHED_PRIMARY, &mdev->flags)) | |
798 | mdf |= MDF_CRASHED_PRIMARY; | |
799 | if (mdev->state.role == R_PRIMARY || | |
800 | (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY)) | |
801 | mdf |= MDF_PRIMARY_IND; | |
802 | if (mdev->state.conn > C_WF_REPORT_PARAMS) | |
803 | mdf |= MDF_CONNECTED_IND; | |
804 | if (mdev->state.disk > D_INCONSISTENT) | |
805 | mdf |= MDF_CONSISTENT; | |
806 | if (mdev->state.disk > D_OUTDATED) | |
807 | mdf |= MDF_WAS_UP_TO_DATE; | |
808 | if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT) | |
809 | mdf |= MDF_PEER_OUT_DATED; | |
810 | if (mdf != mdev->ldev->md.flags) { | |
811 | mdev->ldev->md.flags = mdf; | |
812 | drbd_md_mark_dirty(mdev); | |
813 | } | |
814 | if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT) | |
815 | drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]); | |
816 | put_ldev(mdev); | |
817 | } | |
818 | ||
819 | /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */ | |
820 | if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT && | |
821 | os.peer == R_SECONDARY && ns.peer == R_PRIMARY) | |
822 | set_bit(CONSIDER_RESYNC, &mdev->flags); | |
823 | ||
824 | /* Receiver should clean up itself */ | |
825 | if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING) | |
826 | drbd_thread_stop_nowait(&mdev->tconn->receiver); | |
827 | ||
828 | /* Now the receiver finished cleaning up itself, it should die */ | |
829 | if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE) | |
830 | drbd_thread_stop_nowait(&mdev->tconn->receiver); | |
831 | ||
832 | /* Upon network failure, we need to restart the receiver. */ | |
833 | if (os.conn > C_TEAR_DOWN && | |
834 | ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT) | |
835 | drbd_thread_restart_nowait(&mdev->tconn->receiver); | |
836 | ||
837 | /* Resume AL writing if we get a connection */ | |
838 | if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) | |
839 | drbd_resume_al(mdev); | |
840 | ||
841 | ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC); | |
842 | if (ascw) { | |
843 | ascw->os = os; | |
844 | ascw->ns = ns; | |
845 | ascw->flags = flags; | |
846 | ascw->w.cb = w_after_state_ch; | |
a21e9298 | 847 | ascw->w.mdev = mdev; |
b8907339 PR |
848 | ascw->done = done; |
849 | drbd_queue_work(&mdev->tconn->data.work, &ascw->w); | |
850 | } else { | |
851 | dev_warn(DEV, "Could not kmalloc an ascw\n"); | |
852 | } | |
853 | ||
854 | return rv; | |
855 | } | |
856 | ||
00d56944 | 857 | static int w_after_state_ch(struct drbd_work *w, int unused) |
b8907339 PR |
858 | { |
859 | struct after_state_chg_work *ascw = | |
860 | container_of(w, struct after_state_chg_work, w); | |
00d56944 | 861 | struct drbd_conf *mdev = w->mdev; |
b8907339 PR |
862 | |
863 | after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags); | |
864 | if (ascw->flags & CS_WAIT_COMPLETE) { | |
865 | D_ASSERT(ascw->done != NULL); | |
866 | complete(ascw->done); | |
867 | } | |
868 | kfree(ascw); | |
869 | ||
870 | return 1; | |
871 | } | |
872 | ||
873 | static void abw_start_sync(struct drbd_conf *mdev, int rv) | |
874 | { | |
875 | if (rv) { | |
876 | dev_err(DEV, "Writing the bitmap failed not starting resync.\n"); | |
877 | _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE); | |
878 | return; | |
879 | } | |
880 | ||
881 | switch (mdev->state.conn) { | |
882 | case C_STARTING_SYNC_T: | |
883 | _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); | |
884 | break; | |
885 | case C_STARTING_SYNC_S: | |
886 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
887 | break; | |
888 | } | |
889 | } | |
890 | ||
891 | int drbd_bitmap_io_from_worker(struct drbd_conf *mdev, | |
892 | int (*io_fn)(struct drbd_conf *), | |
893 | char *why, enum bm_flag flags) | |
894 | { | |
895 | int rv; | |
896 | ||
897 | D_ASSERT(current == mdev->tconn->worker.task); | |
898 | ||
899 | /* open coded non-blocking drbd_suspend_io(mdev); */ | |
900 | set_bit(SUSPEND_IO, &mdev->flags); | |
901 | ||
902 | drbd_bm_lock(mdev, why, flags); | |
903 | rv = io_fn(mdev); | |
904 | drbd_bm_unlock(mdev); | |
905 | ||
906 | drbd_resume_io(mdev); | |
907 | ||
908 | return rv; | |
909 | } | |
910 | ||
911 | /** | |
912 | * after_state_ch() - Perform after state change actions that may sleep | |
913 | * @mdev: DRBD device. | |
914 | * @os: old state. | |
915 | * @ns: new state. | |
916 | * @flags: Flags | |
917 | */ | |
918 | static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, | |
919 | union drbd_state ns, enum chg_state_flags flags) | |
920 | { | |
921 | enum drbd_fencing_p fp; | |
922 | enum drbd_req_event what = NOTHING; | |
923 | union drbd_state nsm = (union drbd_state){ .i = -1 }; | |
924 | ||
925 | if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) { | |
926 | clear_bit(CRASHED_PRIMARY, &mdev->flags); | |
927 | if (mdev->p_uuid) | |
928 | mdev->p_uuid[UI_FLAGS] &= ~((u64)2); | |
929 | } | |
930 | ||
931 | fp = FP_DONT_CARE; | |
932 | if (get_ldev(mdev)) { | |
933 | fp = mdev->ldev->dc.fencing; | |
934 | put_ldev(mdev); | |
935 | } | |
936 | ||
937 | /* Inform userspace about the change... */ | |
938 | drbd_bcast_state(mdev, ns); | |
939 | ||
940 | if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) && | |
941 | (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)) | |
942 | drbd_khelper(mdev, "pri-on-incon-degr"); | |
943 | ||
944 | /* Here we have the actions that are performed after a | |
945 | state change. This function might sleep */ | |
946 | ||
947 | nsm.i = -1; | |
948 | if (ns.susp_nod) { | |
949 | if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) | |
950 | what = RESEND; | |
951 | ||
952 | if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING) | |
953 | what = RESTART_FROZEN_DISK_IO; | |
954 | ||
955 | if (what != NOTHING) | |
956 | nsm.susp_nod = 0; | |
957 | } | |
958 | ||
959 | if (ns.susp_fen) { | |
960 | /* case1: The outdate peer handler is successful: */ | |
961 | if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) { | |
962 | tl_clear(mdev); | |
963 | if (test_bit(NEW_CUR_UUID, &mdev->flags)) { | |
964 | drbd_uuid_new_current(mdev); | |
965 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
966 | } | |
967 | spin_lock_irq(&mdev->tconn->req_lock); | |
968 | _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL); | |
969 | spin_unlock_irq(&mdev->tconn->req_lock); | |
970 | } | |
971 | /* case2: The connection was established again: */ | |
972 | if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) { | |
973 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
974 | what = RESEND; | |
975 | nsm.susp_fen = 0; | |
976 | } | |
977 | } | |
978 | ||
979 | if (what != NOTHING) { | |
980 | spin_lock_irq(&mdev->tconn->req_lock); | |
981 | _tl_restart(mdev, what); | |
982 | nsm.i &= mdev->state.i; | |
983 | _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL); | |
984 | spin_unlock_irq(&mdev->tconn->req_lock); | |
985 | } | |
986 | ||
987 | /* Became sync source. With protocol >= 96, we still need to send out | |
988 | * the sync uuid now. Need to do that before any drbd_send_state, or | |
989 | * the other side may go "paused sync" before receiving the sync uuids, | |
990 | * which is unexpected. */ | |
991 | if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) && | |
992 | (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) && | |
993 | mdev->tconn->agreed_pro_version >= 96 && get_ldev(mdev)) { | |
994 | drbd_gen_and_send_sync_uuid(mdev); | |
995 | put_ldev(mdev); | |
996 | } | |
997 | ||
998 | /* Do not change the order of the if above and the two below... */ | |
999 | if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */ | |
1000 | drbd_send_uuids(mdev); | |
1001 | drbd_send_state(mdev); | |
1002 | } | |
1003 | /* No point in queuing send_bitmap if we don't have a connection | |
1004 | * anymore, so check also the _current_ state, not only the new state | |
1005 | * at the time this work was queued. */ | |
1006 | if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S && | |
1007 | mdev->state.conn == C_WF_BITMAP_S) | |
1008 | drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, | |
1009 | "send_bitmap (WFBitMapS)", | |
1010 | BM_LOCKED_TEST_ALLOWED); | |
1011 | ||
1012 | /* Lost contact to peer's copy of the data */ | |
1013 | if ((os.pdsk >= D_INCONSISTENT && | |
1014 | os.pdsk != D_UNKNOWN && | |
1015 | os.pdsk != D_OUTDATED) | |
1016 | && (ns.pdsk < D_INCONSISTENT || | |
1017 | ns.pdsk == D_UNKNOWN || | |
1018 | ns.pdsk == D_OUTDATED)) { | |
1019 | if (get_ldev(mdev)) { | |
1020 | if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) && | |
1021 | mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) { | |
1022 | if (is_susp(mdev->state)) { | |
1023 | set_bit(NEW_CUR_UUID, &mdev->flags); | |
1024 | } else { | |
1025 | drbd_uuid_new_current(mdev); | |
1026 | drbd_send_uuids(mdev); | |
1027 | } | |
1028 | } | |
1029 | put_ldev(mdev); | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) { | |
1034 | if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) { | |
1035 | drbd_uuid_new_current(mdev); | |
1036 | drbd_send_uuids(mdev); | |
1037 | } | |
1038 | ||
1039 | /* D_DISKLESS Peer becomes secondary */ | |
1040 | if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY) | |
1041 | /* We may still be Primary ourselves. | |
1042 | * No harm done if the bitmap still changes, | |
1043 | * redirtied pages will follow later. */ | |
1044 | drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, | |
1045 | "demote diskless peer", BM_LOCKED_SET_ALLOWED); | |
1046 | put_ldev(mdev); | |
1047 | } | |
1048 | ||
1049 | /* Write out all changed bits on demote. | |
1050 | * Though, no need to da that just yet | |
1051 | * if there is a resync going on still */ | |
1052 | if (os.role == R_PRIMARY && ns.role == R_SECONDARY && | |
1053 | mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) { | |
1054 | /* No changes to the bitmap expected this time, so assert that, | |
1055 | * even though no harm was done if it did change. */ | |
1056 | drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, | |
1057 | "demote", BM_LOCKED_TEST_ALLOWED); | |
1058 | put_ldev(mdev); | |
1059 | } | |
1060 | ||
1061 | /* Last part of the attaching process ... */ | |
1062 | if (ns.conn >= C_CONNECTED && | |
1063 | os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) { | |
1064 | drbd_send_sizes(mdev, 0, 0); /* to start sync... */ | |
1065 | drbd_send_uuids(mdev); | |
1066 | drbd_send_state(mdev); | |
1067 | } | |
1068 | ||
1069 | /* We want to pause/continue resync, tell peer. */ | |
1070 | if (ns.conn >= C_CONNECTED && | |
1071 | ((os.aftr_isp != ns.aftr_isp) || | |
1072 | (os.user_isp != ns.user_isp))) | |
1073 | drbd_send_state(mdev); | |
1074 | ||
1075 | /* In case one of the isp bits got set, suspend other devices. */ | |
1076 | if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) && | |
1077 | (ns.aftr_isp || ns.peer_isp || ns.user_isp)) | |
1078 | suspend_other_sg(mdev); | |
1079 | ||
1080 | /* Make sure the peer gets informed about eventual state | |
1081 | changes (ISP bits) while we were in WFReportParams. */ | |
1082 | if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED) | |
1083 | drbd_send_state(mdev); | |
1084 | ||
1085 | if (os.conn != C_AHEAD && ns.conn == C_AHEAD) | |
1086 | drbd_send_state(mdev); | |
1087 | ||
1088 | /* We are in the progress to start a full sync... */ | |
1089 | if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || | |
1090 | (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S)) | |
1091 | /* no other bitmap changes expected during this phase */ | |
1092 | drbd_queue_bitmap_io(mdev, | |
1093 | &drbd_bmio_set_n_write, &abw_start_sync, | |
1094 | "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED); | |
1095 | ||
1096 | /* We are invalidating our self... */ | |
1097 | if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED && | |
1098 | os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT) | |
1099 | /* other bitmap operation expected during this phase */ | |
1100 | drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, | |
1101 | "set_n_write from invalidate", BM_LOCKED_MASK); | |
1102 | ||
1103 | /* first half of local IO error, failure to attach, | |
1104 | * or administrative detach */ | |
1105 | if (os.disk != D_FAILED && ns.disk == D_FAILED) { | |
1106 | enum drbd_io_error_p eh; | |
1107 | int was_io_error; | |
1108 | /* corresponding get_ldev was in __drbd_set_state, to serialize | |
1109 | * our cleanup here with the transition to D_DISKLESS, | |
1110 | * so it is safe to dreference ldev here. */ | |
1111 | eh = mdev->ldev->dc.on_io_error; | |
1112 | was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags); | |
1113 | ||
1114 | /* current state still has to be D_FAILED, | |
1115 | * there is only one way out: to D_DISKLESS, | |
1116 | * and that may only happen after our put_ldev below. */ | |
1117 | if (mdev->state.disk != D_FAILED) | |
1118 | dev_err(DEV, | |
1119 | "ASSERT FAILED: disk is %s during detach\n", | |
1120 | drbd_disk_str(mdev->state.disk)); | |
1121 | ||
1122 | if (drbd_send_state(mdev)) | |
1123 | dev_warn(DEV, "Notified peer that I am detaching my disk\n"); | |
1124 | else | |
1125 | dev_err(DEV, "Sending state for detaching disk failed\n"); | |
1126 | ||
1127 | drbd_rs_cancel_all(mdev); | |
1128 | ||
1129 | /* In case we want to get something to stable storage still, | |
1130 | * this may be the last chance. | |
1131 | * Following put_ldev may transition to D_DISKLESS. */ | |
1132 | drbd_md_sync(mdev); | |
1133 | put_ldev(mdev); | |
1134 | ||
1135 | if (was_io_error && eh == EP_CALL_HELPER) | |
1136 | drbd_khelper(mdev, "local-io-error"); | |
1137 | } | |
1138 | ||
1139 | /* second half of local IO error, failure to attach, | |
1140 | * or administrative detach, | |
1141 | * after local_cnt references have reached zero again */ | |
1142 | if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) { | |
1143 | /* We must still be diskless, | |
1144 | * re-attach has to be serialized with this! */ | |
1145 | if (mdev->state.disk != D_DISKLESS) | |
1146 | dev_err(DEV, | |
1147 | "ASSERT FAILED: disk is %s while going diskless\n", | |
1148 | drbd_disk_str(mdev->state.disk)); | |
1149 | ||
1150 | mdev->rs_total = 0; | |
1151 | mdev->rs_failed = 0; | |
1152 | atomic_set(&mdev->rs_pending_cnt, 0); | |
1153 | ||
1154 | if (drbd_send_state(mdev)) | |
1155 | dev_warn(DEV, "Notified peer that I'm now diskless.\n"); | |
1156 | /* corresponding get_ldev in __drbd_set_state | |
1157 | * this may finally trigger drbd_ldev_destroy. */ | |
1158 | put_ldev(mdev); | |
1159 | } | |
1160 | ||
1161 | /* Notify peer that I had a local IO error, and did not detached.. */ | |
1162 | if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT) | |
1163 | drbd_send_state(mdev); | |
1164 | ||
1165 | /* Disks got bigger while they were detached */ | |
1166 | if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING && | |
1167 | test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) { | |
1168 | if (ns.conn == C_CONNECTED) | |
1169 | resync_after_online_grow(mdev); | |
1170 | } | |
1171 | ||
1172 | /* A resync finished or aborted, wake paused devices... */ | |
1173 | if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) || | |
1174 | (os.peer_isp && !ns.peer_isp) || | |
1175 | (os.user_isp && !ns.user_isp)) | |
1176 | resume_next_sg(mdev); | |
1177 | ||
1178 | /* sync target done with resync. Explicitly notify peer, even though | |
1179 | * it should (at least for non-empty resyncs) already know itself. */ | |
1180 | if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED) | |
1181 | drbd_send_state(mdev); | |
1182 | ||
1183 | /* This triggers bitmap writeout of potentially still unwritten pages | |
1184 | * if the resync finished cleanly, or aborted because of peer disk | |
1185 | * failure, or because of connection loss. | |
1186 | * For resync aborted because of local disk failure, we cannot do | |
1187 | * any bitmap writeout anymore. | |
1188 | * No harm done if some bits change during this phase. | |
1189 | */ | |
1190 | if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) { | |
1191 | drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, | |
1192 | "write from resync_finished", BM_LOCKED_SET_ALLOWED); | |
1193 | put_ldev(mdev); | |
1194 | } | |
1195 | ||
1196 | if (ns.disk == D_DISKLESS && | |
1197 | ns.conn == C_STANDALONE && | |
1198 | ns.role == R_SECONDARY) { | |
1199 | if (os.aftr_isp != ns.aftr_isp) | |
1200 | resume_next_sg(mdev); | |
1201 | } | |
1202 | ||
1203 | after_conn_state_ch(mdev->tconn, os, ns, flags); | |
1204 | drbd_md_sync(mdev); | |
1205 | } | |
1206 | ||
1207 | static void after_conn_state_ch(struct drbd_tconn *tconn, union drbd_state os, | |
1208 | union drbd_state ns, enum chg_state_flags flags) | |
1209 | { | |
1210 | /* Upon network configuration, we need to start the receiver */ | |
1211 | if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED) | |
1212 | drbd_thread_start(&tconn->receiver); | |
1213 | ||
1214 | if (ns.disk == D_DISKLESS && | |
1215 | ns.conn == C_STANDALONE && | |
1216 | ns.role == R_SECONDARY) { | |
1217 | /* if (test_bit(DEVICE_DYING, &mdev->flags)) TODO: DEVICE_DYING functionality */ | |
1218 | drbd_thread_stop_nowait(&tconn->worker); | |
1219 | } | |
1220 | } |