Commit | Line | Data |
---|---|---|
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); | |
3509502d | 50 | static enum drbd_state_rv is_valid_transition(union drbd_state os, union drbd_state ns); |
4308a0a3 PR |
51 | static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns, |
52 | const char **warn_sync_abort); | |
b8907339 PR |
53 | |
54 | /** | |
55 | * cl_wide_st_chg() - true if the state change is a cluster wide one | |
56 | * @mdev: DRBD device. | |
57 | * @os: old (current) state. | |
58 | * @ns: new (wanted) state. | |
59 | */ | |
60 | static int cl_wide_st_chg(struct drbd_conf *mdev, | |
61 | union drbd_state os, union drbd_state ns) | |
62 | { | |
63 | return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED && | |
64 | ((os.role != R_PRIMARY && ns.role == R_PRIMARY) || | |
65 | (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || | |
66 | (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) || | |
67 | (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) || | |
68 | (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) || | |
69 | (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S); | |
70 | } | |
71 | ||
56707f9e PR |
72 | static union drbd_state |
73 | apply_mask_val(union drbd_state os, union drbd_state mask, union drbd_state val) | |
74 | { | |
75 | union drbd_state ns; | |
76 | ns.i = (os.i & ~mask.i) | val.i; | |
77 | return ns; | |
78 | } | |
79 | ||
b8907339 PR |
80 | enum drbd_state_rv |
81 | drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f, | |
82 | union drbd_state mask, union drbd_state val) | |
83 | { | |
84 | unsigned long flags; | |
56707f9e | 85 | union drbd_state ns; |
b8907339 PR |
86 | enum drbd_state_rv rv; |
87 | ||
88 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
56707f9e | 89 | ns = apply_mask_val(mdev->state, mask, val); |
b8907339 PR |
90 | rv = _drbd_set_state(mdev, ns, f, NULL); |
91 | ns = mdev->state; | |
92 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
93 | ||
94 | return rv; | |
95 | } | |
96 | ||
97 | /** | |
98 | * drbd_force_state() - Impose a change which happens outside our control on our state | |
99 | * @mdev: DRBD device. | |
100 | * @mask: mask of state bits to change. | |
101 | * @val: value of new state bits. | |
102 | */ | |
103 | void drbd_force_state(struct drbd_conf *mdev, | |
104 | union drbd_state mask, union drbd_state val) | |
105 | { | |
106 | drbd_change_state(mdev, CS_HARD, mask, val); | |
107 | } | |
108 | ||
109 | static enum drbd_state_rv | |
110 | _req_st_cond(struct drbd_conf *mdev, union drbd_state mask, | |
111 | union drbd_state val) | |
112 | { | |
113 | union drbd_state os, ns; | |
114 | unsigned long flags; | |
115 | enum drbd_state_rv rv; | |
116 | ||
117 | if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags)) | |
118 | return SS_CW_SUCCESS; | |
119 | ||
120 | if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags)) | |
121 | return SS_CW_FAILED_BY_PEER; | |
122 | ||
b8907339 PR |
123 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
124 | os = mdev->state; | |
56707f9e | 125 | ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL); |
3509502d PR |
126 | rv = is_valid_transition(os, ns); |
127 | if (rv == SS_SUCCESS) | |
128 | rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ | |
b8907339 PR |
129 | |
130 | if (!cl_wide_st_chg(mdev, os, ns)) | |
131 | rv = SS_CW_NO_NEED; | |
3509502d | 132 | if (rv == SS_UNKNOWN_ERROR) { |
b8907339 PR |
133 | rv = is_valid_state(mdev, ns); |
134 | if (rv == SS_SUCCESS) { | |
a75f34ad | 135 | rv = is_valid_soft_transition(os, ns); |
b8907339 PR |
136 | if (rv == SS_SUCCESS) |
137 | rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ | |
138 | } | |
139 | } | |
140 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
141 | ||
142 | return rv; | |
143 | } | |
144 | ||
145 | /** | |
146 | * drbd_req_state() - Perform an eventually cluster wide state change | |
147 | * @mdev: DRBD device. | |
148 | * @mask: mask of state bits to change. | |
149 | * @val: value of new state bits. | |
150 | * @f: flags | |
151 | * | |
152 | * Should not be called directly, use drbd_request_state() or | |
153 | * _drbd_request_state(). | |
154 | */ | |
155 | static enum drbd_state_rv | |
156 | drbd_req_state(struct drbd_conf *mdev, union drbd_state mask, | |
157 | union drbd_state val, enum chg_state_flags f) | |
158 | { | |
159 | struct completion done; | |
160 | unsigned long flags; | |
161 | union drbd_state os, ns; | |
162 | enum drbd_state_rv rv; | |
163 | ||
164 | init_completion(&done); | |
165 | ||
166 | if (f & CS_SERIALIZE) | |
167 | mutex_lock(&mdev->state_mutex); | |
168 | ||
169 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
170 | os = mdev->state; | |
56707f9e | 171 | ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL); |
3509502d PR |
172 | rv = is_valid_transition(os, ns); |
173 | if (rv < SS_SUCCESS) | |
174 | goto abort; | |
b8907339 PR |
175 | |
176 | if (cl_wide_st_chg(mdev, os, ns)) { | |
177 | rv = is_valid_state(mdev, ns); | |
178 | if (rv == SS_SUCCESS) | |
a75f34ad | 179 | rv = is_valid_soft_transition(os, ns); |
b8907339 PR |
180 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
181 | ||
182 | if (rv < SS_SUCCESS) { | |
183 | if (f & CS_VERBOSE) | |
184 | print_st_err(mdev, os, ns, rv); | |
185 | goto abort; | |
186 | } | |
187 | ||
188 | drbd_state_lock(mdev); | |
189 | if (!drbd_send_state_req(mdev, mask, val)) { | |
190 | drbd_state_unlock(mdev); | |
191 | rv = SS_CW_FAILED_BY_PEER; | |
192 | if (f & CS_VERBOSE) | |
193 | print_st_err(mdev, os, ns, rv); | |
194 | goto abort; | |
195 | } | |
196 | ||
197 | wait_event(mdev->state_wait, | |
198 | (rv = _req_st_cond(mdev, mask, val))); | |
199 | ||
200 | if (rv < SS_SUCCESS) { | |
201 | drbd_state_unlock(mdev); | |
202 | if (f & CS_VERBOSE) | |
203 | print_st_err(mdev, os, ns, rv); | |
204 | goto abort; | |
205 | } | |
206 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
56707f9e | 207 | ns = apply_mask_val(mdev->state, mask, val); |
b8907339 PR |
208 | rv = _drbd_set_state(mdev, ns, f, &done); |
209 | drbd_state_unlock(mdev); | |
210 | } else { | |
211 | rv = _drbd_set_state(mdev, ns, f, &done); | |
212 | } | |
213 | ||
214 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
215 | ||
216 | if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) { | |
217 | D_ASSERT(current != mdev->tconn->worker.task); | |
218 | wait_for_completion(&done); | |
219 | } | |
220 | ||
221 | abort: | |
222 | if (f & CS_SERIALIZE) | |
223 | mutex_unlock(&mdev->state_mutex); | |
224 | ||
225 | return rv; | |
226 | } | |
227 | ||
228 | /** | |
229 | * _drbd_request_state() - Request a state change (with flags) | |
230 | * @mdev: DRBD device. | |
231 | * @mask: mask of state bits to change. | |
232 | * @val: value of new state bits. | |
233 | * @f: flags | |
234 | * | |
235 | * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE | |
236 | * flag, or when logging of failed state change requests is not desired. | |
237 | */ | |
238 | enum drbd_state_rv | |
239 | _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask, | |
240 | union drbd_state val, enum chg_state_flags f) | |
241 | { | |
242 | enum drbd_state_rv rv; | |
243 | ||
244 | wait_event(mdev->state_wait, | |
245 | (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE); | |
246 | ||
247 | return rv; | |
248 | } | |
249 | ||
250 | static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns) | |
251 | { | |
252 | dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c%c%c }\n", | |
253 | name, | |
254 | drbd_conn_str(ns.conn), | |
255 | drbd_role_str(ns.role), | |
256 | drbd_role_str(ns.peer), | |
257 | drbd_disk_str(ns.disk), | |
258 | drbd_disk_str(ns.pdsk), | |
259 | is_susp(ns) ? 's' : 'r', | |
260 | ns.aftr_isp ? 'a' : '-', | |
261 | ns.peer_isp ? 'p' : '-', | |
262 | ns.user_isp ? 'u' : '-', | |
263 | ns.susp_fen ? 'F' : '-', | |
264 | ns.susp_nod ? 'N' : '-' | |
265 | ); | |
266 | } | |
267 | ||
268 | void print_st_err(struct drbd_conf *mdev, union drbd_state os, | |
269 | union drbd_state ns, enum drbd_state_rv err) | |
270 | { | |
271 | if (err == SS_IN_TRANSIENT_STATE) | |
272 | return; | |
273 | dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err)); | |
274 | print_st(mdev, " state", os); | |
275 | print_st(mdev, "wanted", ns); | |
276 | } | |
277 | ||
278 | ||
279 | /** | |
280 | * is_valid_state() - Returns an SS_ error code if ns is not valid | |
281 | * @mdev: DRBD device. | |
282 | * @ns: State to consider. | |
283 | */ | |
284 | static enum drbd_state_rv | |
285 | is_valid_state(struct drbd_conf *mdev, union drbd_state ns) | |
286 | { | |
287 | /* See drbd_state_sw_errors in drbd_strings.c */ | |
288 | ||
289 | enum drbd_fencing_p fp; | |
290 | enum drbd_state_rv rv = SS_SUCCESS; | |
291 | ||
292 | fp = FP_DONT_CARE; | |
293 | if (get_ldev(mdev)) { | |
294 | fp = mdev->ldev->dc.fencing; | |
295 | put_ldev(mdev); | |
296 | } | |
297 | ||
298 | if (get_net_conf(mdev->tconn)) { | |
299 | if (!mdev->tconn->net_conf->two_primaries && | |
300 | ns.role == R_PRIMARY && ns.peer == R_PRIMARY) | |
301 | rv = SS_TWO_PRIMARIES; | |
302 | put_net_conf(mdev->tconn); | |
303 | } | |
304 | ||
305 | if (rv <= 0) | |
306 | /* already found a reason to abort */; | |
307 | else if (ns.role == R_SECONDARY && mdev->open_cnt) | |
308 | rv = SS_DEVICE_IN_USE; | |
309 | ||
310 | else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE) | |
311 | rv = SS_NO_UP_TO_DATE_DISK; | |
312 | ||
313 | else if (fp >= FP_RESOURCE && | |
314 | ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN) | |
315 | rv = SS_PRIMARY_NOP; | |
316 | ||
317 | else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT) | |
318 | rv = SS_NO_UP_TO_DATE_DISK; | |
319 | ||
320 | else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT) | |
321 | rv = SS_NO_LOCAL_DISK; | |
322 | ||
323 | else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT) | |
324 | rv = SS_NO_REMOTE_DISK; | |
325 | ||
326 | else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) | |
327 | rv = SS_NO_UP_TO_DATE_DISK; | |
328 | ||
329 | else if ((ns.conn == C_CONNECTED || | |
330 | ns.conn == C_WF_BITMAP_S || | |
331 | ns.conn == C_SYNC_SOURCE || | |
332 | ns.conn == C_PAUSED_SYNC_S) && | |
333 | ns.disk == D_OUTDATED) | |
334 | rv = SS_CONNECTED_OUTDATES; | |
335 | ||
336 | else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
337 | (mdev->sync_conf.verify_alg[0] == 0)) | |
338 | rv = SS_NO_VERIFY_ALG; | |
339 | ||
340 | else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
341 | mdev->tconn->agreed_pro_version < 88) | |
342 | rv = SS_NOT_SUPPORTED; | |
343 | ||
344 | else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN) | |
345 | rv = SS_CONNECTED_OUTDATES; | |
346 | ||
347 | return rv; | |
348 | } | |
349 | ||
350 | /** | |
a75f34ad | 351 | * is_valid_soft_transition() - Returns an SS_ error code if the state transition is not possible |
3509502d PR |
352 | * This function limits state transitions that may be declined by DRBD. I.e. |
353 | * user requests (aka soft transitions). | |
b8907339 PR |
354 | * @mdev: DRBD device. |
355 | * @ns: new state. | |
356 | * @os: old state. | |
357 | */ | |
358 | static enum drbd_state_rv | |
a75f34ad | 359 | is_valid_soft_transition(union drbd_state os, union drbd_state ns) |
b8907339 PR |
360 | { |
361 | enum drbd_state_rv rv = SS_SUCCESS; | |
362 | ||
363 | if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) && | |
364 | os.conn > C_CONNECTED) | |
365 | rv = SS_RESYNC_RUNNING; | |
366 | ||
367 | if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE) | |
368 | rv = SS_ALREADY_STANDALONE; | |
369 | ||
370 | if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS) | |
371 | rv = SS_IS_DISKLESS; | |
372 | ||
373 | if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED) | |
374 | rv = SS_NO_NET_CONFIG; | |
375 | ||
376 | if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING) | |
377 | rv = SS_LOWER_THAN_OUTDATED; | |
378 | ||
379 | if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED) | |
380 | rv = SS_IN_TRANSIENT_STATE; | |
381 | ||
382 | if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS) | |
383 | rv = SS_IN_TRANSIENT_STATE; | |
384 | ||
385 | if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED) | |
386 | rv = SS_NEED_CONNECTION; | |
387 | ||
388 | if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
389 | ns.conn != os.conn && os.conn > C_CONNECTED) | |
390 | rv = SS_RESYNC_RUNNING; | |
391 | ||
392 | if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) && | |
393 | os.conn < C_CONNECTED) | |
394 | rv = SS_NEED_CONNECTION; | |
395 | ||
396 | if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE) | |
397 | && os.conn < C_WF_REPORT_PARAMS) | |
398 | rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */ | |
399 | ||
400 | return rv; | |
401 | } | |
402 | ||
3509502d | 403 | static enum drbd_state_rv |
fda74117 | 404 | is_valid_conn_transition(enum drbd_conns oc, enum drbd_conns nc) |
3509502d PR |
405 | { |
406 | enum drbd_state_rv rv = SS_SUCCESS; | |
407 | ||
408 | /* Disallow Network errors to configure a device's network part */ | |
fda74117 | 409 | if ((nc >= C_TIMEOUT && nc <= C_TEAR_DOWN) && oc <= C_DISCONNECTING) |
3509502d PR |
410 | rv = SS_NEED_CONNECTION; |
411 | ||
412 | /* After a network error only C_UNCONNECTED or C_DISCONNECTING may follow. */ | |
fda74117 | 413 | if (oc >= C_TIMEOUT && oc <= C_TEAR_DOWN && nc != C_UNCONNECTED && nc != C_DISCONNECTING) |
3509502d PR |
414 | rv = SS_IN_TRANSIENT_STATE; |
415 | ||
416 | /* After C_DISCONNECTING only C_STANDALONE may follow */ | |
fda74117 | 417 | if (oc == C_DISCONNECTING && nc != C_STANDALONE) |
3509502d PR |
418 | rv = SS_IN_TRANSIENT_STATE; |
419 | ||
fda74117 PR |
420 | return rv; |
421 | } | |
422 | ||
423 | ||
424 | /** | |
425 | * is_valid_transition() - Returns an SS_ error code if the state transition is not possible | |
426 | * This limits hard state transitions. Hard state transitions are facts there are | |
427 | * imposed on DRBD by the environment. E.g. disk broke or network broke down. | |
428 | * But those hard state transitions are still not allowed to do everything. | |
429 | * @ns: new state. | |
430 | * @os: old state. | |
431 | */ | |
432 | static enum drbd_state_rv | |
433 | is_valid_transition(union drbd_state os, union drbd_state ns) | |
434 | { | |
435 | enum drbd_state_rv rv; | |
436 | ||
437 | rv = is_valid_conn_transition(os.conn, ns.conn); | |
438 | ||
3509502d PR |
439 | /* we cannot fail (again) if we already detached */ |
440 | if (ns.disk == D_FAILED && os.disk == D_DISKLESS) | |
441 | rv = SS_IS_DISKLESS; | |
442 | ||
4308a0a3 PR |
443 | /* if we are only D_ATTACHING yet, |
444 | * we can (and should) go directly to D_DISKLESS. */ | |
445 | if (ns.disk == D_FAILED && os.disk == D_ATTACHING) { | |
446 | printk("TODO: FIX ME\n"); | |
447 | rv = SS_IS_DISKLESS; | |
448 | } | |
449 | ||
3509502d PR |
450 | return rv; |
451 | } | |
452 | ||
b8907339 PR |
453 | /** |
454 | * sanitize_state() - Resolves implicitly necessary additional changes to a state transition | |
455 | * @mdev: DRBD device. | |
456 | * @os: old state. | |
457 | * @ns: new state. | |
458 | * @warn_sync_abort: | |
459 | * | |
460 | * When we loose connection, we have to set the state of the peers disk (pdsk) | |
461 | * to D_UNKNOWN. This rule and many more along those lines are in this function. | |
462 | */ | |
4308a0a3 PR |
463 | static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns, |
464 | const char **warn_sync_abort) | |
b8907339 PR |
465 | { |
466 | enum drbd_fencing_p fp; | |
467 | enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max; | |
468 | ||
469 | fp = FP_DONT_CARE; | |
470 | if (get_ldev(mdev)) { | |
471 | fp = mdev->ldev->dc.fencing; | |
472 | put_ldev(mdev); | |
473 | } | |
474 | ||
3509502d | 475 | /* Implications from connection to peer and peer_isp */ |
b8907339 PR |
476 | if (ns.conn < C_CONNECTED) { |
477 | ns.peer_isp = 0; | |
478 | ns.peer = R_UNKNOWN; | |
479 | if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT) | |
480 | ns.pdsk = D_UNKNOWN; | |
481 | } | |
482 | ||
483 | /* Clear the aftr_isp when becoming unconfigured */ | |
484 | if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY) | |
485 | ns.aftr_isp = 0; | |
486 | ||
4308a0a3 | 487 | /* An implication of the disk states onto the connection state */ |
b8907339 | 488 | /* Abort resync if a disk fails/detaches */ |
4308a0a3 | 489 | if (ns.conn > C_CONNECTED && (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) { |
b8907339 PR |
490 | if (warn_sync_abort) |
491 | *warn_sync_abort = | |
4308a0a3 | 492 | ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T ? |
b8907339 PR |
493 | "Online-verify" : "Resync"; |
494 | ns.conn = C_CONNECTED; | |
495 | } | |
496 | ||
497 | /* Connection breaks down before we finished "Negotiating" */ | |
498 | if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING && | |
499 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
500 | if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) { | |
501 | ns.disk = mdev->new_state_tmp.disk; | |
502 | ns.pdsk = mdev->new_state_tmp.pdsk; | |
503 | } else { | |
504 | dev_alert(DEV, "Connection lost while negotiating, no data!\n"); | |
505 | ns.disk = D_DISKLESS; | |
506 | ns.pdsk = D_UNKNOWN; | |
507 | } | |
508 | put_ldev(mdev); | |
509 | } | |
510 | ||
511 | /* D_CONSISTENT and D_OUTDATED vanish when we get connected */ | |
512 | if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) { | |
513 | if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED) | |
514 | ns.disk = D_UP_TO_DATE; | |
515 | if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED) | |
516 | ns.pdsk = D_UP_TO_DATE; | |
517 | } | |
518 | ||
519 | /* Implications of the connection stat on the disk states */ | |
520 | disk_min = D_DISKLESS; | |
521 | disk_max = D_UP_TO_DATE; | |
522 | pdsk_min = D_INCONSISTENT; | |
523 | pdsk_max = D_UNKNOWN; | |
524 | switch ((enum drbd_conns)ns.conn) { | |
525 | case C_WF_BITMAP_T: | |
526 | case C_PAUSED_SYNC_T: | |
527 | case C_STARTING_SYNC_T: | |
528 | case C_WF_SYNC_UUID: | |
529 | case C_BEHIND: | |
530 | disk_min = D_INCONSISTENT; | |
531 | disk_max = D_OUTDATED; | |
532 | pdsk_min = D_UP_TO_DATE; | |
533 | pdsk_max = D_UP_TO_DATE; | |
534 | break; | |
535 | case C_VERIFY_S: | |
536 | case C_VERIFY_T: | |
537 | disk_min = D_UP_TO_DATE; | |
538 | disk_max = D_UP_TO_DATE; | |
539 | pdsk_min = D_UP_TO_DATE; | |
540 | pdsk_max = D_UP_TO_DATE; | |
541 | break; | |
542 | case C_CONNECTED: | |
543 | disk_min = D_DISKLESS; | |
544 | disk_max = D_UP_TO_DATE; | |
545 | pdsk_min = D_DISKLESS; | |
546 | pdsk_max = D_UP_TO_DATE; | |
547 | break; | |
548 | case C_WF_BITMAP_S: | |
549 | case C_PAUSED_SYNC_S: | |
550 | case C_STARTING_SYNC_S: | |
551 | case C_AHEAD: | |
552 | disk_min = D_UP_TO_DATE; | |
553 | disk_max = D_UP_TO_DATE; | |
554 | pdsk_min = D_INCONSISTENT; | |
555 | pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/ | |
556 | break; | |
557 | case C_SYNC_TARGET: | |
558 | disk_min = D_INCONSISTENT; | |
559 | disk_max = D_INCONSISTENT; | |
560 | pdsk_min = D_UP_TO_DATE; | |
561 | pdsk_max = D_UP_TO_DATE; | |
562 | break; | |
563 | case C_SYNC_SOURCE: | |
564 | disk_min = D_UP_TO_DATE; | |
565 | disk_max = D_UP_TO_DATE; | |
566 | pdsk_min = D_INCONSISTENT; | |
567 | pdsk_max = D_INCONSISTENT; | |
568 | break; | |
569 | case C_STANDALONE: | |
570 | case C_DISCONNECTING: | |
571 | case C_UNCONNECTED: | |
572 | case C_TIMEOUT: | |
573 | case C_BROKEN_PIPE: | |
574 | case C_NETWORK_FAILURE: | |
575 | case C_PROTOCOL_ERROR: | |
576 | case C_TEAR_DOWN: | |
577 | case C_WF_CONNECTION: | |
578 | case C_WF_REPORT_PARAMS: | |
579 | case C_MASK: | |
580 | break; | |
581 | } | |
582 | if (ns.disk > disk_max) | |
583 | ns.disk = disk_max; | |
584 | ||
585 | if (ns.disk < disk_min) { | |
586 | dev_warn(DEV, "Implicitly set disk from %s to %s\n", | |
587 | drbd_disk_str(ns.disk), drbd_disk_str(disk_min)); | |
588 | ns.disk = disk_min; | |
589 | } | |
590 | if (ns.pdsk > pdsk_max) | |
591 | ns.pdsk = pdsk_max; | |
592 | ||
593 | if (ns.pdsk < pdsk_min) { | |
594 | dev_warn(DEV, "Implicitly set pdsk from %s to %s\n", | |
595 | drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min)); | |
596 | ns.pdsk = pdsk_min; | |
597 | } | |
598 | ||
599 | if (fp == FP_STONITH && | |
4308a0a3 | 600 | (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED)) |
b8907339 PR |
601 | ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */ |
602 | ||
603 | if (mdev->sync_conf.on_no_data == OND_SUSPEND_IO && | |
4308a0a3 | 604 | (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)) |
b8907339 PR |
605 | ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */ |
606 | ||
607 | if (ns.aftr_isp || ns.peer_isp || ns.user_isp) { | |
608 | if (ns.conn == C_SYNC_SOURCE) | |
609 | ns.conn = C_PAUSED_SYNC_S; | |
610 | if (ns.conn == C_SYNC_TARGET) | |
611 | ns.conn = C_PAUSED_SYNC_T; | |
612 | } else { | |
613 | if (ns.conn == C_PAUSED_SYNC_S) | |
614 | ns.conn = C_SYNC_SOURCE; | |
615 | if (ns.conn == C_PAUSED_SYNC_T) | |
616 | ns.conn = C_SYNC_TARGET; | |
617 | } | |
618 | ||
619 | return ns; | |
620 | } | |
621 | ||
622 | void drbd_resume_al(struct drbd_conf *mdev) | |
623 | { | |
624 | if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags)) | |
625 | dev_info(DEV, "Resumed AL updates\n"); | |
626 | } | |
627 | ||
628 | /* helper for __drbd_set_state */ | |
629 | static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs) | |
630 | { | |
631 | if (mdev->tconn->agreed_pro_version < 90) | |
632 | mdev->ov_start_sector = 0; | |
633 | mdev->rs_total = drbd_bm_bits(mdev); | |
634 | mdev->ov_position = 0; | |
635 | if (cs == C_VERIFY_T) { | |
636 | /* starting online verify from an arbitrary position | |
637 | * does not fit well into the existing protocol. | |
638 | * on C_VERIFY_T, we initialize ov_left and friends | |
639 | * implicitly in receive_DataRequest once the | |
640 | * first P_OV_REQUEST is received */ | |
641 | mdev->ov_start_sector = ~(sector_t)0; | |
642 | } else { | |
643 | unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector); | |
644 | if (bit >= mdev->rs_total) { | |
645 | mdev->ov_start_sector = | |
646 | BM_BIT_TO_SECT(mdev->rs_total - 1); | |
647 | mdev->rs_total = 1; | |
648 | } else | |
649 | mdev->rs_total -= bit; | |
650 | mdev->ov_position = mdev->ov_start_sector; | |
651 | } | |
652 | mdev->ov_left = mdev->rs_total; | |
653 | } | |
654 | ||
655 | /** | |
656 | * __drbd_set_state() - Set a new DRBD state | |
657 | * @mdev: DRBD device. | |
658 | * @ns: new state. | |
659 | * @flags: Flags | |
660 | * @done: Optional completion, that will get completed after the after_state_ch() finished | |
661 | * | |
662 | * Caller needs to hold req_lock, and global_state_lock. Do not call directly. | |
663 | */ | |
664 | enum drbd_state_rv | |
665 | __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns, | |
666 | enum chg_state_flags flags, struct completion *done) | |
667 | { | |
668 | union drbd_state os; | |
669 | enum drbd_state_rv rv = SS_SUCCESS; | |
670 | const char *warn_sync_abort = NULL; | |
671 | struct after_state_chg_work *ascw; | |
672 | ||
673 | os = mdev->state; | |
674 | ||
4308a0a3 | 675 | ns = sanitize_state(mdev, ns, &warn_sync_abort); |
b8907339 PR |
676 | if (ns.i == os.i) |
677 | return SS_NOTHING_TO_DO; | |
678 | ||
3509502d PR |
679 | rv = is_valid_transition(os, ns); |
680 | if (rv < SS_SUCCESS) | |
681 | return rv; | |
682 | ||
b8907339 PR |
683 | if (!(flags & CS_HARD)) { |
684 | /* pre-state-change checks ; only look at ns */ | |
685 | /* See drbd_state_sw_errors in drbd_strings.c */ | |
686 | ||
687 | rv = is_valid_state(mdev, ns); | |
688 | if (rv < SS_SUCCESS) { | |
689 | /* If the old state was illegal as well, then let | |
690 | this happen...*/ | |
691 | ||
692 | if (is_valid_state(mdev, os) == rv) | |
a75f34ad | 693 | rv = is_valid_soft_transition(os, ns); |
b8907339 | 694 | } else |
a75f34ad | 695 | rv = is_valid_soft_transition(os, ns); |
b8907339 PR |
696 | } |
697 | ||
698 | if (rv < SS_SUCCESS) { | |
699 | if (flags & CS_VERBOSE) | |
700 | print_st_err(mdev, os, ns, rv); | |
701 | return rv; | |
702 | } | |
703 | ||
704 | if (warn_sync_abort) | |
705 | dev_warn(DEV, "%s aborted.\n", warn_sync_abort); | |
706 | ||
707 | { | |
708 | char *pbp, pb[300]; | |
709 | pbp = pb; | |
710 | *pbp = 0; | |
711 | if (ns.role != os.role) | |
712 | pbp += sprintf(pbp, "role( %s -> %s ) ", | |
713 | drbd_role_str(os.role), | |
714 | drbd_role_str(ns.role)); | |
715 | if (ns.peer != os.peer) | |
716 | pbp += sprintf(pbp, "peer( %s -> %s ) ", | |
717 | drbd_role_str(os.peer), | |
718 | drbd_role_str(ns.peer)); | |
719 | if (ns.conn != os.conn) | |
720 | pbp += sprintf(pbp, "conn( %s -> %s ) ", | |
721 | drbd_conn_str(os.conn), | |
722 | drbd_conn_str(ns.conn)); | |
723 | if (ns.disk != os.disk) | |
724 | pbp += sprintf(pbp, "disk( %s -> %s ) ", | |
725 | drbd_disk_str(os.disk), | |
726 | drbd_disk_str(ns.disk)); | |
727 | if (ns.pdsk != os.pdsk) | |
728 | pbp += sprintf(pbp, "pdsk( %s -> %s ) ", | |
729 | drbd_disk_str(os.pdsk), | |
730 | drbd_disk_str(ns.pdsk)); | |
731 | if (is_susp(ns) != is_susp(os)) | |
732 | pbp += sprintf(pbp, "susp( %d -> %d ) ", | |
733 | is_susp(os), | |
734 | is_susp(ns)); | |
735 | if (ns.aftr_isp != os.aftr_isp) | |
736 | pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ", | |
737 | os.aftr_isp, | |
738 | ns.aftr_isp); | |
739 | if (ns.peer_isp != os.peer_isp) | |
740 | pbp += sprintf(pbp, "peer_isp( %d -> %d ) ", | |
741 | os.peer_isp, | |
742 | ns.peer_isp); | |
743 | if (ns.user_isp != os.user_isp) | |
744 | pbp += sprintf(pbp, "user_isp( %d -> %d ) ", | |
745 | os.user_isp, | |
746 | ns.user_isp); | |
747 | dev_info(DEV, "%s\n", pb); | |
748 | } | |
749 | ||
750 | /* solve the race between becoming unconfigured, | |
751 | * worker doing the cleanup, and | |
752 | * admin reconfiguring us: | |
753 | * on (re)configure, first set CONFIG_PENDING, | |
754 | * then wait for a potentially exiting worker, | |
755 | * start the worker, and schedule one no_op. | |
756 | * then proceed with configuration. | |
757 | */ | |
758 | if (ns.disk == D_DISKLESS && | |
759 | ns.conn == C_STANDALONE && | |
760 | ns.role == R_SECONDARY && | |
761 | !test_and_set_bit(CONFIG_PENDING, &mdev->flags)) | |
762 | set_bit(DEVICE_DYING, &mdev->flags); | |
763 | ||
764 | /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference | |
765 | * on the ldev here, to be sure the transition -> D_DISKLESS resp. | |
766 | * drbd_ldev_destroy() won't happen before our corresponding | |
767 | * after_state_ch works run, where we put_ldev again. */ | |
768 | if ((os.disk != D_FAILED && ns.disk == D_FAILED) || | |
769 | (os.disk != D_DISKLESS && ns.disk == D_DISKLESS)) | |
770 | atomic_inc(&mdev->local_cnt); | |
771 | ||
772 | mdev->state = ns; | |
773 | ||
774 | if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING) | |
775 | drbd_print_uuids(mdev, "attached to UUIDs"); | |
776 | ||
777 | wake_up(&mdev->misc_wait); | |
778 | wake_up(&mdev->state_wait); | |
2a67d8b9 | 779 | wake_up(&mdev->tconn->ping_wait); |
b8907339 PR |
780 | |
781 | /* aborted verify run. log the last position */ | |
782 | if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) && | |
783 | ns.conn < C_CONNECTED) { | |
784 | mdev->ov_start_sector = | |
785 | BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left); | |
786 | dev_info(DEV, "Online Verify reached sector %llu\n", | |
787 | (unsigned long long)mdev->ov_start_sector); | |
788 | } | |
789 | ||
790 | if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) && | |
791 | (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) { | |
792 | dev_info(DEV, "Syncer continues.\n"); | |
793 | mdev->rs_paused += (long)jiffies | |
794 | -(long)mdev->rs_mark_time[mdev->rs_last_mark]; | |
795 | if (ns.conn == C_SYNC_TARGET) | |
796 | mod_timer(&mdev->resync_timer, jiffies); | |
797 | } | |
798 | ||
799 | if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) && | |
800 | (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) { | |
801 | dev_info(DEV, "Resync suspended\n"); | |
802 | mdev->rs_mark_time[mdev->rs_last_mark] = jiffies; | |
803 | } | |
804 | ||
805 | if (os.conn == C_CONNECTED && | |
806 | (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) { | |
807 | unsigned long now = jiffies; | |
808 | int i; | |
809 | ||
810 | set_ov_position(mdev, ns.conn); | |
811 | mdev->rs_start = now; | |
812 | mdev->rs_last_events = 0; | |
813 | mdev->rs_last_sect_ev = 0; | |
814 | mdev->ov_last_oos_size = 0; | |
815 | mdev->ov_last_oos_start = 0; | |
816 | ||
817 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { | |
818 | mdev->rs_mark_left[i] = mdev->ov_left; | |
819 | mdev->rs_mark_time[i] = now; | |
820 | } | |
821 | ||
822 | drbd_rs_controller_reset(mdev); | |
823 | ||
824 | if (ns.conn == C_VERIFY_S) { | |
825 | dev_info(DEV, "Starting Online Verify from sector %llu\n", | |
826 | (unsigned long long)mdev->ov_position); | |
827 | mod_timer(&mdev->resync_timer, jiffies); | |
828 | } | |
829 | } | |
830 | ||
831 | if (get_ldev(mdev)) { | |
832 | u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND| | |
833 | MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE| | |
834 | MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY); | |
835 | ||
836 | if (test_bit(CRASHED_PRIMARY, &mdev->flags)) | |
837 | mdf |= MDF_CRASHED_PRIMARY; | |
838 | if (mdev->state.role == R_PRIMARY || | |
839 | (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY)) | |
840 | mdf |= MDF_PRIMARY_IND; | |
841 | if (mdev->state.conn > C_WF_REPORT_PARAMS) | |
842 | mdf |= MDF_CONNECTED_IND; | |
843 | if (mdev->state.disk > D_INCONSISTENT) | |
844 | mdf |= MDF_CONSISTENT; | |
845 | if (mdev->state.disk > D_OUTDATED) | |
846 | mdf |= MDF_WAS_UP_TO_DATE; | |
847 | if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT) | |
848 | mdf |= MDF_PEER_OUT_DATED; | |
849 | if (mdf != mdev->ldev->md.flags) { | |
850 | mdev->ldev->md.flags = mdf; | |
851 | drbd_md_mark_dirty(mdev); | |
852 | } | |
853 | if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT) | |
854 | drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]); | |
855 | put_ldev(mdev); | |
856 | } | |
857 | ||
858 | /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */ | |
859 | if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT && | |
860 | os.peer == R_SECONDARY && ns.peer == R_PRIMARY) | |
861 | set_bit(CONSIDER_RESYNC, &mdev->flags); | |
862 | ||
863 | /* Receiver should clean up itself */ | |
864 | if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING) | |
865 | drbd_thread_stop_nowait(&mdev->tconn->receiver); | |
866 | ||
867 | /* Now the receiver finished cleaning up itself, it should die */ | |
868 | if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE) | |
869 | drbd_thread_stop_nowait(&mdev->tconn->receiver); | |
870 | ||
871 | /* Upon network failure, we need to restart the receiver. */ | |
872 | if (os.conn > C_TEAR_DOWN && | |
873 | ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT) | |
874 | drbd_thread_restart_nowait(&mdev->tconn->receiver); | |
875 | ||
876 | /* Resume AL writing if we get a connection */ | |
877 | if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) | |
878 | drbd_resume_al(mdev); | |
879 | ||
880 | ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC); | |
881 | if (ascw) { | |
882 | ascw->os = os; | |
883 | ascw->ns = ns; | |
884 | ascw->flags = flags; | |
885 | ascw->w.cb = w_after_state_ch; | |
a21e9298 | 886 | ascw->w.mdev = mdev; |
b8907339 PR |
887 | ascw->done = done; |
888 | drbd_queue_work(&mdev->tconn->data.work, &ascw->w); | |
889 | } else { | |
890 | dev_warn(DEV, "Could not kmalloc an ascw\n"); | |
891 | } | |
892 | ||
893 | return rv; | |
894 | } | |
895 | ||
00d56944 | 896 | static int w_after_state_ch(struct drbd_work *w, int unused) |
b8907339 PR |
897 | { |
898 | struct after_state_chg_work *ascw = | |
899 | container_of(w, struct after_state_chg_work, w); | |
00d56944 | 900 | struct drbd_conf *mdev = w->mdev; |
b8907339 PR |
901 | |
902 | after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags); | |
903 | if (ascw->flags & CS_WAIT_COMPLETE) { | |
904 | D_ASSERT(ascw->done != NULL); | |
905 | complete(ascw->done); | |
906 | } | |
907 | kfree(ascw); | |
908 | ||
909 | return 1; | |
910 | } | |
911 | ||
912 | static void abw_start_sync(struct drbd_conf *mdev, int rv) | |
913 | { | |
914 | if (rv) { | |
915 | dev_err(DEV, "Writing the bitmap failed not starting resync.\n"); | |
916 | _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE); | |
917 | return; | |
918 | } | |
919 | ||
920 | switch (mdev->state.conn) { | |
921 | case C_STARTING_SYNC_T: | |
922 | _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); | |
923 | break; | |
924 | case C_STARTING_SYNC_S: | |
925 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
926 | break; | |
927 | } | |
928 | } | |
929 | ||
930 | int drbd_bitmap_io_from_worker(struct drbd_conf *mdev, | |
931 | int (*io_fn)(struct drbd_conf *), | |
932 | char *why, enum bm_flag flags) | |
933 | { | |
934 | int rv; | |
935 | ||
936 | D_ASSERT(current == mdev->tconn->worker.task); | |
937 | ||
938 | /* open coded non-blocking drbd_suspend_io(mdev); */ | |
939 | set_bit(SUSPEND_IO, &mdev->flags); | |
940 | ||
941 | drbd_bm_lock(mdev, why, flags); | |
942 | rv = io_fn(mdev); | |
943 | drbd_bm_unlock(mdev); | |
944 | ||
945 | drbd_resume_io(mdev); | |
946 | ||
947 | return rv; | |
948 | } | |
949 | ||
950 | /** | |
951 | * after_state_ch() - Perform after state change actions that may sleep | |
952 | * @mdev: DRBD device. | |
953 | * @os: old state. | |
954 | * @ns: new state. | |
955 | * @flags: Flags | |
956 | */ | |
957 | static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, | |
958 | union drbd_state ns, enum chg_state_flags flags) | |
959 | { | |
960 | enum drbd_fencing_p fp; | |
961 | enum drbd_req_event what = NOTHING; | |
962 | union drbd_state nsm = (union drbd_state){ .i = -1 }; | |
963 | ||
964 | if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) { | |
965 | clear_bit(CRASHED_PRIMARY, &mdev->flags); | |
966 | if (mdev->p_uuid) | |
967 | mdev->p_uuid[UI_FLAGS] &= ~((u64)2); | |
968 | } | |
969 | ||
970 | fp = FP_DONT_CARE; | |
971 | if (get_ldev(mdev)) { | |
972 | fp = mdev->ldev->dc.fencing; | |
973 | put_ldev(mdev); | |
974 | } | |
975 | ||
976 | /* Inform userspace about the change... */ | |
977 | drbd_bcast_state(mdev, ns); | |
978 | ||
979 | if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) && | |
980 | (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)) | |
981 | drbd_khelper(mdev, "pri-on-incon-degr"); | |
982 | ||
983 | /* Here we have the actions that are performed after a | |
984 | state change. This function might sleep */ | |
985 | ||
986 | nsm.i = -1; | |
987 | if (ns.susp_nod) { | |
988 | if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) | |
989 | what = RESEND; | |
990 | ||
991 | if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING) | |
992 | what = RESTART_FROZEN_DISK_IO; | |
993 | ||
994 | if (what != NOTHING) | |
995 | nsm.susp_nod = 0; | |
996 | } | |
997 | ||
998 | if (ns.susp_fen) { | |
999 | /* case1: The outdate peer handler is successful: */ | |
1000 | if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) { | |
1001 | tl_clear(mdev); | |
1002 | if (test_bit(NEW_CUR_UUID, &mdev->flags)) { | |
1003 | drbd_uuid_new_current(mdev); | |
1004 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
1005 | } | |
1006 | spin_lock_irq(&mdev->tconn->req_lock); | |
1007 | _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL); | |
1008 | spin_unlock_irq(&mdev->tconn->req_lock); | |
1009 | } | |
1010 | /* case2: The connection was established again: */ | |
1011 | if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) { | |
1012 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
1013 | what = RESEND; | |
1014 | nsm.susp_fen = 0; | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | if (what != NOTHING) { | |
1019 | spin_lock_irq(&mdev->tconn->req_lock); | |
1020 | _tl_restart(mdev, what); | |
1021 | nsm.i &= mdev->state.i; | |
1022 | _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL); | |
1023 | spin_unlock_irq(&mdev->tconn->req_lock); | |
1024 | } | |
1025 | ||
1026 | /* Became sync source. With protocol >= 96, we still need to send out | |
1027 | * the sync uuid now. Need to do that before any drbd_send_state, or | |
1028 | * the other side may go "paused sync" before receiving the sync uuids, | |
1029 | * which is unexpected. */ | |
1030 | if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) && | |
1031 | (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) && | |
1032 | mdev->tconn->agreed_pro_version >= 96 && get_ldev(mdev)) { | |
1033 | drbd_gen_and_send_sync_uuid(mdev); | |
1034 | put_ldev(mdev); | |
1035 | } | |
1036 | ||
1037 | /* Do not change the order of the if above and the two below... */ | |
1038 | if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */ | |
1039 | drbd_send_uuids(mdev); | |
1040 | drbd_send_state(mdev); | |
1041 | } | |
1042 | /* No point in queuing send_bitmap if we don't have a connection | |
1043 | * anymore, so check also the _current_ state, not only the new state | |
1044 | * at the time this work was queued. */ | |
1045 | if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S && | |
1046 | mdev->state.conn == C_WF_BITMAP_S) | |
1047 | drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, | |
1048 | "send_bitmap (WFBitMapS)", | |
1049 | BM_LOCKED_TEST_ALLOWED); | |
1050 | ||
1051 | /* Lost contact to peer's copy of the data */ | |
1052 | if ((os.pdsk >= D_INCONSISTENT && | |
1053 | os.pdsk != D_UNKNOWN && | |
1054 | os.pdsk != D_OUTDATED) | |
1055 | && (ns.pdsk < D_INCONSISTENT || | |
1056 | ns.pdsk == D_UNKNOWN || | |
1057 | ns.pdsk == D_OUTDATED)) { | |
1058 | if (get_ldev(mdev)) { | |
1059 | if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) && | |
1060 | mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) { | |
1061 | if (is_susp(mdev->state)) { | |
1062 | set_bit(NEW_CUR_UUID, &mdev->flags); | |
1063 | } else { | |
1064 | drbd_uuid_new_current(mdev); | |
1065 | drbd_send_uuids(mdev); | |
1066 | } | |
1067 | } | |
1068 | put_ldev(mdev); | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) { | |
1073 | if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) { | |
1074 | drbd_uuid_new_current(mdev); | |
1075 | drbd_send_uuids(mdev); | |
1076 | } | |
1077 | ||
1078 | /* D_DISKLESS Peer becomes secondary */ | |
1079 | if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY) | |
1080 | /* We may still be Primary ourselves. | |
1081 | * No harm done if the bitmap still changes, | |
1082 | * redirtied pages will follow later. */ | |
1083 | drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, | |
1084 | "demote diskless peer", BM_LOCKED_SET_ALLOWED); | |
1085 | put_ldev(mdev); | |
1086 | } | |
1087 | ||
1088 | /* Write out all changed bits on demote. | |
1089 | * Though, no need to da that just yet | |
1090 | * if there is a resync going on still */ | |
1091 | if (os.role == R_PRIMARY && ns.role == R_SECONDARY && | |
1092 | mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) { | |
1093 | /* No changes to the bitmap expected this time, so assert that, | |
1094 | * even though no harm was done if it did change. */ | |
1095 | drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, | |
1096 | "demote", BM_LOCKED_TEST_ALLOWED); | |
1097 | put_ldev(mdev); | |
1098 | } | |
1099 | ||
1100 | /* Last part of the attaching process ... */ | |
1101 | if (ns.conn >= C_CONNECTED && | |
1102 | os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) { | |
1103 | drbd_send_sizes(mdev, 0, 0); /* to start sync... */ | |
1104 | drbd_send_uuids(mdev); | |
1105 | drbd_send_state(mdev); | |
1106 | } | |
1107 | ||
1108 | /* We want to pause/continue resync, tell peer. */ | |
1109 | if (ns.conn >= C_CONNECTED && | |
1110 | ((os.aftr_isp != ns.aftr_isp) || | |
1111 | (os.user_isp != ns.user_isp))) | |
1112 | drbd_send_state(mdev); | |
1113 | ||
1114 | /* In case one of the isp bits got set, suspend other devices. */ | |
1115 | if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) && | |
1116 | (ns.aftr_isp || ns.peer_isp || ns.user_isp)) | |
1117 | suspend_other_sg(mdev); | |
1118 | ||
1119 | /* Make sure the peer gets informed about eventual state | |
1120 | changes (ISP bits) while we were in WFReportParams. */ | |
1121 | if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED) | |
1122 | drbd_send_state(mdev); | |
1123 | ||
1124 | if (os.conn != C_AHEAD && ns.conn == C_AHEAD) | |
1125 | drbd_send_state(mdev); | |
1126 | ||
1127 | /* We are in the progress to start a full sync... */ | |
1128 | if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || | |
1129 | (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S)) | |
1130 | /* no other bitmap changes expected during this phase */ | |
1131 | drbd_queue_bitmap_io(mdev, | |
1132 | &drbd_bmio_set_n_write, &abw_start_sync, | |
1133 | "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED); | |
1134 | ||
1135 | /* We are invalidating our self... */ | |
1136 | if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED && | |
1137 | os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT) | |
1138 | /* other bitmap operation expected during this phase */ | |
1139 | drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, | |
1140 | "set_n_write from invalidate", BM_LOCKED_MASK); | |
1141 | ||
1142 | /* first half of local IO error, failure to attach, | |
1143 | * or administrative detach */ | |
1144 | if (os.disk != D_FAILED && ns.disk == D_FAILED) { | |
1145 | enum drbd_io_error_p eh; | |
1146 | int was_io_error; | |
1147 | /* corresponding get_ldev was in __drbd_set_state, to serialize | |
1148 | * our cleanup here with the transition to D_DISKLESS, | |
1149 | * so it is safe to dreference ldev here. */ | |
1150 | eh = mdev->ldev->dc.on_io_error; | |
1151 | was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags); | |
1152 | ||
1153 | /* current state still has to be D_FAILED, | |
1154 | * there is only one way out: to D_DISKLESS, | |
1155 | * and that may only happen after our put_ldev below. */ | |
1156 | if (mdev->state.disk != D_FAILED) | |
1157 | dev_err(DEV, | |
1158 | "ASSERT FAILED: disk is %s during detach\n", | |
1159 | drbd_disk_str(mdev->state.disk)); | |
1160 | ||
1161 | if (drbd_send_state(mdev)) | |
1162 | dev_warn(DEV, "Notified peer that I am detaching my disk\n"); | |
1163 | else | |
1164 | dev_err(DEV, "Sending state for detaching disk failed\n"); | |
1165 | ||
1166 | drbd_rs_cancel_all(mdev); | |
1167 | ||
1168 | /* In case we want to get something to stable storage still, | |
1169 | * this may be the last chance. | |
1170 | * Following put_ldev may transition to D_DISKLESS. */ | |
1171 | drbd_md_sync(mdev); | |
1172 | put_ldev(mdev); | |
1173 | ||
1174 | if (was_io_error && eh == EP_CALL_HELPER) | |
1175 | drbd_khelper(mdev, "local-io-error"); | |
1176 | } | |
1177 | ||
1178 | /* second half of local IO error, failure to attach, | |
1179 | * or administrative detach, | |
1180 | * after local_cnt references have reached zero again */ | |
1181 | if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) { | |
1182 | /* We must still be diskless, | |
1183 | * re-attach has to be serialized with this! */ | |
1184 | if (mdev->state.disk != D_DISKLESS) | |
1185 | dev_err(DEV, | |
1186 | "ASSERT FAILED: disk is %s while going diskless\n", | |
1187 | drbd_disk_str(mdev->state.disk)); | |
1188 | ||
1189 | mdev->rs_total = 0; | |
1190 | mdev->rs_failed = 0; | |
1191 | atomic_set(&mdev->rs_pending_cnt, 0); | |
1192 | ||
1193 | if (drbd_send_state(mdev)) | |
1194 | dev_warn(DEV, "Notified peer that I'm now diskless.\n"); | |
1195 | /* corresponding get_ldev in __drbd_set_state | |
1196 | * this may finally trigger drbd_ldev_destroy. */ | |
1197 | put_ldev(mdev); | |
1198 | } | |
1199 | ||
1200 | /* Notify peer that I had a local IO error, and did not detached.. */ | |
1201 | if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT) | |
1202 | drbd_send_state(mdev); | |
1203 | ||
1204 | /* Disks got bigger while they were detached */ | |
1205 | if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING && | |
1206 | test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) { | |
1207 | if (ns.conn == C_CONNECTED) | |
1208 | resync_after_online_grow(mdev); | |
1209 | } | |
1210 | ||
1211 | /* A resync finished or aborted, wake paused devices... */ | |
1212 | if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) || | |
1213 | (os.peer_isp && !ns.peer_isp) || | |
1214 | (os.user_isp && !ns.user_isp)) | |
1215 | resume_next_sg(mdev); | |
1216 | ||
1217 | /* sync target done with resync. Explicitly notify peer, even though | |
1218 | * it should (at least for non-empty resyncs) already know itself. */ | |
1219 | if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED) | |
1220 | drbd_send_state(mdev); | |
1221 | ||
1222 | /* This triggers bitmap writeout of potentially still unwritten pages | |
1223 | * if the resync finished cleanly, or aborted because of peer disk | |
1224 | * failure, or because of connection loss. | |
1225 | * For resync aborted because of local disk failure, we cannot do | |
1226 | * any bitmap writeout anymore. | |
1227 | * No harm done if some bits change during this phase. | |
1228 | */ | |
1229 | if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) { | |
1230 | drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, | |
1231 | "write from resync_finished", BM_LOCKED_SET_ALLOWED); | |
1232 | put_ldev(mdev); | |
1233 | } | |
1234 | ||
1235 | if (ns.disk == D_DISKLESS && | |
1236 | ns.conn == C_STANDALONE && | |
1237 | ns.role == R_SECONDARY) { | |
1238 | if (os.aftr_isp != ns.aftr_isp) | |
1239 | resume_next_sg(mdev); | |
1240 | } | |
1241 | ||
1242 | after_conn_state_ch(mdev->tconn, os, ns, flags); | |
1243 | drbd_md_sync(mdev); | |
1244 | } | |
1245 | ||
1246 | static void after_conn_state_ch(struct drbd_tconn *tconn, union drbd_state os, | |
1247 | union drbd_state ns, enum chg_state_flags flags) | |
1248 | { | |
1249 | /* Upon network configuration, we need to start the receiver */ | |
1250 | if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED) | |
1251 | drbd_thread_start(&tconn->receiver); | |
1252 | ||
1253 | if (ns.disk == D_DISKLESS && | |
1254 | ns.conn == C_STANDALONE && | |
1255 | ns.role == R_SECONDARY) { | |
1256 | /* if (test_bit(DEVICE_DYING, &mdev->flags)) TODO: DEVICE_DYING functionality */ | |
1257 | drbd_thread_stop_nowait(&tconn->worker); | |
1258 | } | |
1259 | } |