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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); | |
bbeb641c | 46 | static void after_all_state_ch(struct drbd_tconn *tconn, union drbd_state ns); |
a75f34ad PR |
47 | static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state); |
48 | static enum drbd_state_rv is_valid_soft_transition(union drbd_state, union drbd_state); | |
3509502d | 49 | static enum drbd_state_rv is_valid_transition(union drbd_state os, union drbd_state ns); |
4308a0a3 PR |
50 | static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns, |
51 | 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 | ||
56707f9e PR |
71 | static union drbd_state |
72 | apply_mask_val(union drbd_state os, union drbd_state mask, union drbd_state val) | |
73 | { | |
74 | union drbd_state ns; | |
75 | ns.i = (os.i & ~mask.i) | val.i; | |
76 | return ns; | |
77 | } | |
78 | ||
b8907339 PR |
79 | enum drbd_state_rv |
80 | drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f, | |
81 | union drbd_state mask, union drbd_state val) | |
82 | { | |
83 | unsigned long flags; | |
56707f9e | 84 | union drbd_state ns; |
b8907339 PR |
85 | enum drbd_state_rv rv; |
86 | ||
87 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
56707f9e | 88 | ns = apply_mask_val(mdev->state, mask, val); |
b8907339 PR |
89 | rv = _drbd_set_state(mdev, ns, f, NULL); |
90 | ns = mdev->state; | |
91 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
92 | ||
93 | return rv; | |
94 | } | |
95 | ||
96 | /** | |
97 | * drbd_force_state() - Impose a change which happens outside our control on our state | |
98 | * @mdev: DRBD device. | |
99 | * @mask: mask of state bits to change. | |
100 | * @val: value of new state bits. | |
101 | */ | |
102 | void drbd_force_state(struct drbd_conf *mdev, | |
103 | union drbd_state mask, union drbd_state val) | |
104 | { | |
105 | drbd_change_state(mdev, CS_HARD, mask, val); | |
106 | } | |
107 | ||
108 | static enum drbd_state_rv | |
109 | _req_st_cond(struct drbd_conf *mdev, union drbd_state mask, | |
110 | union drbd_state val) | |
111 | { | |
112 | union drbd_state os, ns; | |
113 | unsigned long flags; | |
114 | enum drbd_state_rv rv; | |
115 | ||
116 | if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags)) | |
117 | return SS_CW_SUCCESS; | |
118 | ||
119 | if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags)) | |
120 | return SS_CW_FAILED_BY_PEER; | |
121 | ||
b8907339 PR |
122 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
123 | os = mdev->state; | |
56707f9e | 124 | ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL); |
3509502d PR |
125 | rv = is_valid_transition(os, ns); |
126 | if (rv == SS_SUCCESS) | |
127 | rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ | |
b8907339 PR |
128 | |
129 | if (!cl_wide_st_chg(mdev, os, ns)) | |
130 | rv = SS_CW_NO_NEED; | |
3509502d | 131 | if (rv == SS_UNKNOWN_ERROR) { |
b8907339 PR |
132 | rv = is_valid_state(mdev, ns); |
133 | if (rv == SS_SUCCESS) { | |
a75f34ad | 134 | rv = is_valid_soft_transition(os, ns); |
b8907339 PR |
135 | if (rv == SS_SUCCESS) |
136 | rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ | |
137 | } | |
138 | } | |
139 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
140 | ||
141 | return rv; | |
142 | } | |
143 | ||
144 | /** | |
145 | * drbd_req_state() - Perform an eventually cluster wide state change | |
146 | * @mdev: DRBD device. | |
147 | * @mask: mask of state bits to change. | |
148 | * @val: value of new state bits. | |
149 | * @f: flags | |
150 | * | |
151 | * Should not be called directly, use drbd_request_state() or | |
152 | * _drbd_request_state(). | |
153 | */ | |
154 | static enum drbd_state_rv | |
155 | drbd_req_state(struct drbd_conf *mdev, union drbd_state mask, | |
156 | union drbd_state val, enum chg_state_flags f) | |
157 | { | |
158 | struct completion done; | |
159 | unsigned long flags; | |
160 | union drbd_state os, ns; | |
161 | enum drbd_state_rv rv; | |
162 | ||
163 | init_completion(&done); | |
164 | ||
165 | if (f & CS_SERIALIZE) | |
8410da8f | 166 | mutex_lock(mdev->state_mutex); |
b8907339 PR |
167 | |
168 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
169 | os = mdev->state; | |
56707f9e | 170 | ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL); |
3509502d PR |
171 | rv = is_valid_transition(os, ns); |
172 | if (rv < SS_SUCCESS) | |
173 | goto abort; | |
b8907339 PR |
174 | |
175 | if (cl_wide_st_chg(mdev, os, ns)) { | |
176 | rv = is_valid_state(mdev, ns); | |
177 | if (rv == SS_SUCCESS) | |
a75f34ad | 178 | rv = is_valid_soft_transition(os, ns); |
b8907339 PR |
179 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
180 | ||
181 | if (rv < SS_SUCCESS) { | |
182 | if (f & CS_VERBOSE) | |
183 | print_st_err(mdev, os, ns, rv); | |
184 | goto abort; | |
185 | } | |
186 | ||
b8907339 | 187 | if (!drbd_send_state_req(mdev, mask, val)) { |
b8907339 PR |
188 | rv = SS_CW_FAILED_BY_PEER; |
189 | if (f & CS_VERBOSE) | |
190 | print_st_err(mdev, os, ns, rv); | |
191 | goto abort; | |
192 | } | |
193 | ||
194 | wait_event(mdev->state_wait, | |
195 | (rv = _req_st_cond(mdev, mask, val))); | |
196 | ||
197 | if (rv < SS_SUCCESS) { | |
b8907339 PR |
198 | if (f & CS_VERBOSE) |
199 | print_st_err(mdev, os, ns, rv); | |
200 | goto abort; | |
201 | } | |
202 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
56707f9e | 203 | ns = apply_mask_val(mdev->state, mask, val); |
b8907339 | 204 | rv = _drbd_set_state(mdev, ns, f, &done); |
b8907339 PR |
205 | } else { |
206 | rv = _drbd_set_state(mdev, ns, f, &done); | |
207 | } | |
208 | ||
209 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
210 | ||
211 | if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) { | |
212 | D_ASSERT(current != mdev->tconn->worker.task); | |
213 | wait_for_completion(&done); | |
214 | } | |
215 | ||
216 | abort: | |
217 | if (f & CS_SERIALIZE) | |
8410da8f | 218 | mutex_unlock(mdev->state_mutex); |
b8907339 PR |
219 | |
220 | return rv; | |
221 | } | |
222 | ||
223 | /** | |
224 | * _drbd_request_state() - Request a state change (with flags) | |
225 | * @mdev: DRBD device. | |
226 | * @mask: mask of state bits to change. | |
227 | * @val: value of new state bits. | |
228 | * @f: flags | |
229 | * | |
230 | * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE | |
231 | * flag, or when logging of failed state change requests is not desired. | |
232 | */ | |
233 | enum drbd_state_rv | |
234 | _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask, | |
235 | union drbd_state val, enum chg_state_flags f) | |
236 | { | |
237 | enum drbd_state_rv rv; | |
238 | ||
239 | wait_event(mdev->state_wait, | |
240 | (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE); | |
241 | ||
242 | return rv; | |
243 | } | |
244 | ||
245 | static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns) | |
246 | { | |
247 | dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c%c%c }\n", | |
248 | name, | |
249 | drbd_conn_str(ns.conn), | |
250 | drbd_role_str(ns.role), | |
251 | drbd_role_str(ns.peer), | |
252 | drbd_disk_str(ns.disk), | |
253 | drbd_disk_str(ns.pdsk), | |
254 | is_susp(ns) ? 's' : 'r', | |
255 | ns.aftr_isp ? 'a' : '-', | |
256 | ns.peer_isp ? 'p' : '-', | |
257 | ns.user_isp ? 'u' : '-', | |
258 | ns.susp_fen ? 'F' : '-', | |
259 | ns.susp_nod ? 'N' : '-' | |
260 | ); | |
261 | } | |
262 | ||
263 | void print_st_err(struct drbd_conf *mdev, union drbd_state os, | |
264 | union drbd_state ns, enum drbd_state_rv err) | |
265 | { | |
266 | if (err == SS_IN_TRANSIENT_STATE) | |
267 | return; | |
268 | dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err)); | |
269 | print_st(mdev, " state", os); | |
270 | print_st(mdev, "wanted", ns); | |
271 | } | |
272 | ||
bbeb641c PR |
273 | static void print_state_change(struct drbd_conf *mdev, union drbd_state os, union drbd_state ns, |
274 | enum chg_state_flags flags) | |
275 | { | |
276 | char *pbp, pb[300]; | |
277 | pbp = pb; | |
278 | *pbp = 0; | |
279 | if (ns.role != os.role) | |
280 | pbp += sprintf(pbp, "role( %s -> %s ) ", | |
281 | drbd_role_str(os.role), | |
282 | drbd_role_str(ns.role)); | |
283 | if (ns.peer != os.peer) | |
284 | pbp += sprintf(pbp, "peer( %s -> %s ) ", | |
285 | drbd_role_str(os.peer), | |
286 | drbd_role_str(ns.peer)); | |
287 | if (ns.conn != os.conn && !(flags & CS_NO_CSTATE_CHG)) | |
288 | pbp += sprintf(pbp, "conn( %s -> %s ) ", | |
289 | drbd_conn_str(os.conn), | |
290 | drbd_conn_str(ns.conn)); | |
291 | if (ns.disk != os.disk) | |
292 | pbp += sprintf(pbp, "disk( %s -> %s ) ", | |
293 | drbd_disk_str(os.disk), | |
294 | drbd_disk_str(ns.disk)); | |
295 | if (ns.pdsk != os.pdsk) | |
296 | pbp += sprintf(pbp, "pdsk( %s -> %s ) ", | |
297 | drbd_disk_str(os.pdsk), | |
298 | drbd_disk_str(ns.pdsk)); | |
299 | if (is_susp(ns) != is_susp(os)) | |
300 | pbp += sprintf(pbp, "susp( %d -> %d ) ", | |
301 | is_susp(os), | |
302 | is_susp(ns)); | |
303 | if (ns.aftr_isp != os.aftr_isp) | |
304 | pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ", | |
305 | os.aftr_isp, | |
306 | ns.aftr_isp); | |
307 | if (ns.peer_isp != os.peer_isp) | |
308 | pbp += sprintf(pbp, "peer_isp( %d -> %d ) ", | |
309 | os.peer_isp, | |
310 | ns.peer_isp); | |
311 | if (ns.user_isp != os.user_isp) | |
312 | pbp += sprintf(pbp, "user_isp( %d -> %d ) ", | |
313 | os.user_isp, | |
314 | ns.user_isp); | |
315 | if (pbp != pb) | |
316 | dev_info(DEV, "%s\n", pb); | |
317 | } | |
b8907339 PR |
318 | |
319 | /** | |
320 | * is_valid_state() - Returns an SS_ error code if ns is not valid | |
321 | * @mdev: DRBD device. | |
322 | * @ns: State to consider. | |
323 | */ | |
324 | static enum drbd_state_rv | |
325 | is_valid_state(struct drbd_conf *mdev, union drbd_state ns) | |
326 | { | |
327 | /* See drbd_state_sw_errors in drbd_strings.c */ | |
328 | ||
329 | enum drbd_fencing_p fp; | |
330 | enum drbd_state_rv rv = SS_SUCCESS; | |
331 | ||
332 | fp = FP_DONT_CARE; | |
333 | if (get_ldev(mdev)) { | |
334 | fp = mdev->ldev->dc.fencing; | |
335 | put_ldev(mdev); | |
336 | } | |
337 | ||
338 | if (get_net_conf(mdev->tconn)) { | |
339 | if (!mdev->tconn->net_conf->two_primaries && | |
340 | ns.role == R_PRIMARY && ns.peer == R_PRIMARY) | |
341 | rv = SS_TWO_PRIMARIES; | |
342 | put_net_conf(mdev->tconn); | |
343 | } | |
344 | ||
345 | if (rv <= 0) | |
346 | /* already found a reason to abort */; | |
347 | else if (ns.role == R_SECONDARY && mdev->open_cnt) | |
348 | rv = SS_DEVICE_IN_USE; | |
349 | ||
350 | else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE) | |
351 | rv = SS_NO_UP_TO_DATE_DISK; | |
352 | ||
353 | else if (fp >= FP_RESOURCE && | |
354 | ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN) | |
355 | rv = SS_PRIMARY_NOP; | |
356 | ||
357 | else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT) | |
358 | rv = SS_NO_UP_TO_DATE_DISK; | |
359 | ||
360 | else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT) | |
361 | rv = SS_NO_LOCAL_DISK; | |
362 | ||
363 | else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT) | |
364 | rv = SS_NO_REMOTE_DISK; | |
365 | ||
366 | else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) | |
367 | rv = SS_NO_UP_TO_DATE_DISK; | |
368 | ||
369 | else if ((ns.conn == C_CONNECTED || | |
370 | ns.conn == C_WF_BITMAP_S || | |
371 | ns.conn == C_SYNC_SOURCE || | |
372 | ns.conn == C_PAUSED_SYNC_S) && | |
373 | ns.disk == D_OUTDATED) | |
374 | rv = SS_CONNECTED_OUTDATES; | |
375 | ||
376 | else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
377 | (mdev->sync_conf.verify_alg[0] == 0)) | |
378 | rv = SS_NO_VERIFY_ALG; | |
379 | ||
380 | else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
381 | mdev->tconn->agreed_pro_version < 88) | |
382 | rv = SS_NOT_SUPPORTED; | |
383 | ||
384 | else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN) | |
385 | rv = SS_CONNECTED_OUTDATES; | |
386 | ||
387 | return rv; | |
388 | } | |
389 | ||
390 | /** | |
a75f34ad | 391 | * is_valid_soft_transition() - Returns an SS_ error code if the state transition is not possible |
3509502d PR |
392 | * This function limits state transitions that may be declined by DRBD. I.e. |
393 | * user requests (aka soft transitions). | |
b8907339 PR |
394 | * @mdev: DRBD device. |
395 | * @ns: new state. | |
396 | * @os: old state. | |
397 | */ | |
398 | static enum drbd_state_rv | |
a75f34ad | 399 | is_valid_soft_transition(union drbd_state os, union drbd_state ns) |
b8907339 PR |
400 | { |
401 | enum drbd_state_rv rv = SS_SUCCESS; | |
402 | ||
403 | if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) && | |
404 | os.conn > C_CONNECTED) | |
405 | rv = SS_RESYNC_RUNNING; | |
406 | ||
407 | if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE) | |
408 | rv = SS_ALREADY_STANDALONE; | |
409 | ||
410 | if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS) | |
411 | rv = SS_IS_DISKLESS; | |
412 | ||
413 | if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED) | |
414 | rv = SS_NO_NET_CONFIG; | |
415 | ||
416 | if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING) | |
417 | rv = SS_LOWER_THAN_OUTDATED; | |
418 | ||
419 | if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED) | |
420 | rv = SS_IN_TRANSIENT_STATE; | |
421 | ||
422 | if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS) | |
423 | rv = SS_IN_TRANSIENT_STATE; | |
424 | ||
425 | if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED) | |
426 | rv = SS_NEED_CONNECTION; | |
427 | ||
428 | if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
429 | ns.conn != os.conn && os.conn > C_CONNECTED) | |
430 | rv = SS_RESYNC_RUNNING; | |
431 | ||
432 | if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) && | |
433 | os.conn < C_CONNECTED) | |
434 | rv = SS_NEED_CONNECTION; | |
435 | ||
436 | if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE) | |
437 | && os.conn < C_WF_REPORT_PARAMS) | |
438 | rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */ | |
439 | ||
440 | return rv; | |
441 | } | |
442 | ||
3509502d | 443 | static enum drbd_state_rv |
fda74117 | 444 | is_valid_conn_transition(enum drbd_conns oc, enum drbd_conns nc) |
3509502d PR |
445 | { |
446 | enum drbd_state_rv rv = SS_SUCCESS; | |
447 | ||
448 | /* Disallow Network errors to configure a device's network part */ | |
fda74117 | 449 | if ((nc >= C_TIMEOUT && nc <= C_TEAR_DOWN) && oc <= C_DISCONNECTING) |
3509502d PR |
450 | rv = SS_NEED_CONNECTION; |
451 | ||
452 | /* After a network error only C_UNCONNECTED or C_DISCONNECTING may follow. */ | |
fda74117 | 453 | if (oc >= C_TIMEOUT && oc <= C_TEAR_DOWN && nc != C_UNCONNECTED && nc != C_DISCONNECTING) |
3509502d PR |
454 | rv = SS_IN_TRANSIENT_STATE; |
455 | ||
456 | /* After C_DISCONNECTING only C_STANDALONE may follow */ | |
fda74117 | 457 | if (oc == C_DISCONNECTING && nc != C_STANDALONE) |
3509502d PR |
458 | rv = SS_IN_TRANSIENT_STATE; |
459 | ||
fda74117 PR |
460 | return rv; |
461 | } | |
462 | ||
463 | ||
464 | /** | |
465 | * is_valid_transition() - Returns an SS_ error code if the state transition is not possible | |
466 | * This limits hard state transitions. Hard state transitions are facts there are | |
467 | * imposed on DRBD by the environment. E.g. disk broke or network broke down. | |
468 | * But those hard state transitions are still not allowed to do everything. | |
469 | * @ns: new state. | |
470 | * @os: old state. | |
471 | */ | |
472 | static enum drbd_state_rv | |
473 | is_valid_transition(union drbd_state os, union drbd_state ns) | |
474 | { | |
475 | enum drbd_state_rv rv; | |
476 | ||
477 | rv = is_valid_conn_transition(os.conn, ns.conn); | |
478 | ||
3509502d PR |
479 | /* we cannot fail (again) if we already detached */ |
480 | if (ns.disk == D_FAILED && os.disk == D_DISKLESS) | |
481 | rv = SS_IS_DISKLESS; | |
482 | ||
4308a0a3 PR |
483 | /* if we are only D_ATTACHING yet, |
484 | * we can (and should) go directly to D_DISKLESS. */ | |
485 | if (ns.disk == D_FAILED && os.disk == D_ATTACHING) { | |
486 | printk("TODO: FIX ME\n"); | |
487 | rv = SS_IS_DISKLESS; | |
488 | } | |
489 | ||
3509502d PR |
490 | return rv; |
491 | } | |
492 | ||
b8907339 PR |
493 | /** |
494 | * sanitize_state() - Resolves implicitly necessary additional changes to a state transition | |
495 | * @mdev: DRBD device. | |
496 | * @os: old state. | |
497 | * @ns: new state. | |
498 | * @warn_sync_abort: | |
499 | * | |
500 | * When we loose connection, we have to set the state of the peers disk (pdsk) | |
501 | * to D_UNKNOWN. This rule and many more along those lines are in this function. | |
502 | */ | |
4308a0a3 PR |
503 | static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns, |
504 | const char **warn_sync_abort) | |
b8907339 PR |
505 | { |
506 | enum drbd_fencing_p fp; | |
507 | enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max; | |
508 | ||
509 | fp = FP_DONT_CARE; | |
510 | if (get_ldev(mdev)) { | |
511 | fp = mdev->ldev->dc.fencing; | |
512 | put_ldev(mdev); | |
513 | } | |
514 | ||
3509502d | 515 | /* Implications from connection to peer and peer_isp */ |
b8907339 PR |
516 | if (ns.conn < C_CONNECTED) { |
517 | ns.peer_isp = 0; | |
518 | ns.peer = R_UNKNOWN; | |
519 | if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT) | |
520 | ns.pdsk = D_UNKNOWN; | |
521 | } | |
522 | ||
523 | /* Clear the aftr_isp when becoming unconfigured */ | |
524 | if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY) | |
525 | ns.aftr_isp = 0; | |
526 | ||
4308a0a3 | 527 | /* An implication of the disk states onto the connection state */ |
b8907339 | 528 | /* Abort resync if a disk fails/detaches */ |
4308a0a3 | 529 | if (ns.conn > C_CONNECTED && (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) { |
b8907339 PR |
530 | if (warn_sync_abort) |
531 | *warn_sync_abort = | |
4308a0a3 | 532 | ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T ? |
b8907339 PR |
533 | "Online-verify" : "Resync"; |
534 | ns.conn = C_CONNECTED; | |
535 | } | |
536 | ||
537 | /* Connection breaks down before we finished "Negotiating" */ | |
538 | if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING && | |
539 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
540 | if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) { | |
541 | ns.disk = mdev->new_state_tmp.disk; | |
542 | ns.pdsk = mdev->new_state_tmp.pdsk; | |
543 | } else { | |
544 | dev_alert(DEV, "Connection lost while negotiating, no data!\n"); | |
545 | ns.disk = D_DISKLESS; | |
546 | ns.pdsk = D_UNKNOWN; | |
547 | } | |
548 | put_ldev(mdev); | |
549 | } | |
550 | ||
551 | /* D_CONSISTENT and D_OUTDATED vanish when we get connected */ | |
552 | if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) { | |
553 | if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED) | |
554 | ns.disk = D_UP_TO_DATE; | |
555 | if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED) | |
556 | ns.pdsk = D_UP_TO_DATE; | |
557 | } | |
558 | ||
559 | /* Implications of the connection stat on the disk states */ | |
560 | disk_min = D_DISKLESS; | |
561 | disk_max = D_UP_TO_DATE; | |
562 | pdsk_min = D_INCONSISTENT; | |
563 | pdsk_max = D_UNKNOWN; | |
564 | switch ((enum drbd_conns)ns.conn) { | |
565 | case C_WF_BITMAP_T: | |
566 | case C_PAUSED_SYNC_T: | |
567 | case C_STARTING_SYNC_T: | |
568 | case C_WF_SYNC_UUID: | |
569 | case C_BEHIND: | |
570 | disk_min = D_INCONSISTENT; | |
571 | disk_max = D_OUTDATED; | |
572 | pdsk_min = D_UP_TO_DATE; | |
573 | pdsk_max = D_UP_TO_DATE; | |
574 | break; | |
575 | case C_VERIFY_S: | |
576 | case C_VERIFY_T: | |
577 | disk_min = D_UP_TO_DATE; | |
578 | disk_max = D_UP_TO_DATE; | |
579 | pdsk_min = D_UP_TO_DATE; | |
580 | pdsk_max = D_UP_TO_DATE; | |
581 | break; | |
582 | case C_CONNECTED: | |
583 | disk_min = D_DISKLESS; | |
584 | disk_max = D_UP_TO_DATE; | |
585 | pdsk_min = D_DISKLESS; | |
586 | pdsk_max = D_UP_TO_DATE; | |
587 | break; | |
588 | case C_WF_BITMAP_S: | |
589 | case C_PAUSED_SYNC_S: | |
590 | case C_STARTING_SYNC_S: | |
591 | case C_AHEAD: | |
592 | disk_min = D_UP_TO_DATE; | |
593 | disk_max = D_UP_TO_DATE; | |
594 | pdsk_min = D_INCONSISTENT; | |
595 | pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/ | |
596 | break; | |
597 | case C_SYNC_TARGET: | |
598 | disk_min = D_INCONSISTENT; | |
599 | disk_max = D_INCONSISTENT; | |
600 | pdsk_min = D_UP_TO_DATE; | |
601 | pdsk_max = D_UP_TO_DATE; | |
602 | break; | |
603 | case C_SYNC_SOURCE: | |
604 | disk_min = D_UP_TO_DATE; | |
605 | disk_max = D_UP_TO_DATE; | |
606 | pdsk_min = D_INCONSISTENT; | |
607 | pdsk_max = D_INCONSISTENT; | |
608 | break; | |
609 | case C_STANDALONE: | |
610 | case C_DISCONNECTING: | |
611 | case C_UNCONNECTED: | |
612 | case C_TIMEOUT: | |
613 | case C_BROKEN_PIPE: | |
614 | case C_NETWORK_FAILURE: | |
615 | case C_PROTOCOL_ERROR: | |
616 | case C_TEAR_DOWN: | |
617 | case C_WF_CONNECTION: | |
618 | case C_WF_REPORT_PARAMS: | |
619 | case C_MASK: | |
620 | break; | |
621 | } | |
622 | if (ns.disk > disk_max) | |
623 | ns.disk = disk_max; | |
624 | ||
625 | if (ns.disk < disk_min) { | |
626 | dev_warn(DEV, "Implicitly set disk from %s to %s\n", | |
627 | drbd_disk_str(ns.disk), drbd_disk_str(disk_min)); | |
628 | ns.disk = disk_min; | |
629 | } | |
630 | if (ns.pdsk > pdsk_max) | |
631 | ns.pdsk = pdsk_max; | |
632 | ||
633 | if (ns.pdsk < pdsk_min) { | |
634 | dev_warn(DEV, "Implicitly set pdsk from %s to %s\n", | |
635 | drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min)); | |
636 | ns.pdsk = pdsk_min; | |
637 | } | |
638 | ||
639 | if (fp == FP_STONITH && | |
4308a0a3 | 640 | (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED)) |
b8907339 PR |
641 | ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */ |
642 | ||
643 | if (mdev->sync_conf.on_no_data == OND_SUSPEND_IO && | |
4308a0a3 | 644 | (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)) |
b8907339 PR |
645 | ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */ |
646 | ||
647 | if (ns.aftr_isp || ns.peer_isp || ns.user_isp) { | |
648 | if (ns.conn == C_SYNC_SOURCE) | |
649 | ns.conn = C_PAUSED_SYNC_S; | |
650 | if (ns.conn == C_SYNC_TARGET) | |
651 | ns.conn = C_PAUSED_SYNC_T; | |
652 | } else { | |
653 | if (ns.conn == C_PAUSED_SYNC_S) | |
654 | ns.conn = C_SYNC_SOURCE; | |
655 | if (ns.conn == C_PAUSED_SYNC_T) | |
656 | ns.conn = C_SYNC_TARGET; | |
657 | } | |
658 | ||
659 | return ns; | |
660 | } | |
661 | ||
662 | void drbd_resume_al(struct drbd_conf *mdev) | |
663 | { | |
664 | if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags)) | |
665 | dev_info(DEV, "Resumed AL updates\n"); | |
666 | } | |
667 | ||
668 | /* helper for __drbd_set_state */ | |
669 | static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs) | |
670 | { | |
671 | if (mdev->tconn->agreed_pro_version < 90) | |
672 | mdev->ov_start_sector = 0; | |
673 | mdev->rs_total = drbd_bm_bits(mdev); | |
674 | mdev->ov_position = 0; | |
675 | if (cs == C_VERIFY_T) { | |
676 | /* starting online verify from an arbitrary position | |
677 | * does not fit well into the existing protocol. | |
678 | * on C_VERIFY_T, we initialize ov_left and friends | |
679 | * implicitly in receive_DataRequest once the | |
680 | * first P_OV_REQUEST is received */ | |
681 | mdev->ov_start_sector = ~(sector_t)0; | |
682 | } else { | |
683 | unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector); | |
684 | if (bit >= mdev->rs_total) { | |
685 | mdev->ov_start_sector = | |
686 | BM_BIT_TO_SECT(mdev->rs_total - 1); | |
687 | mdev->rs_total = 1; | |
688 | } else | |
689 | mdev->rs_total -= bit; | |
690 | mdev->ov_position = mdev->ov_start_sector; | |
691 | } | |
692 | mdev->ov_left = mdev->rs_total; | |
693 | } | |
694 | ||
695 | /** | |
696 | * __drbd_set_state() - Set a new DRBD state | |
697 | * @mdev: DRBD device. | |
698 | * @ns: new state. | |
699 | * @flags: Flags | |
700 | * @done: Optional completion, that will get completed after the after_state_ch() finished | |
701 | * | |
702 | * Caller needs to hold req_lock, and global_state_lock. Do not call directly. | |
703 | */ | |
704 | enum drbd_state_rv | |
705 | __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns, | |
706 | enum chg_state_flags flags, struct completion *done) | |
707 | { | |
708 | union drbd_state os; | |
709 | enum drbd_state_rv rv = SS_SUCCESS; | |
710 | const char *warn_sync_abort = NULL; | |
711 | struct after_state_chg_work *ascw; | |
712 | ||
713 | os = mdev->state; | |
714 | ||
4308a0a3 | 715 | ns = sanitize_state(mdev, ns, &warn_sync_abort); |
b8907339 PR |
716 | if (ns.i == os.i) |
717 | return SS_NOTHING_TO_DO; | |
718 | ||
3509502d PR |
719 | rv = is_valid_transition(os, ns); |
720 | if (rv < SS_SUCCESS) | |
721 | return rv; | |
722 | ||
b8907339 PR |
723 | if (!(flags & CS_HARD)) { |
724 | /* pre-state-change checks ; only look at ns */ | |
725 | /* See drbd_state_sw_errors in drbd_strings.c */ | |
726 | ||
727 | rv = is_valid_state(mdev, ns); | |
728 | if (rv < SS_SUCCESS) { | |
729 | /* If the old state was illegal as well, then let | |
730 | this happen...*/ | |
731 | ||
732 | if (is_valid_state(mdev, os) == rv) | |
a75f34ad | 733 | rv = is_valid_soft_transition(os, ns); |
b8907339 | 734 | } else |
a75f34ad | 735 | rv = is_valid_soft_transition(os, ns); |
b8907339 PR |
736 | } |
737 | ||
738 | if (rv < SS_SUCCESS) { | |
739 | if (flags & CS_VERBOSE) | |
740 | print_st_err(mdev, os, ns, rv); | |
741 | return rv; | |
742 | } | |
743 | ||
744 | if (warn_sync_abort) | |
745 | dev_warn(DEV, "%s aborted.\n", warn_sync_abort); | |
746 | ||
bbeb641c | 747 | print_state_change(mdev, os, ns, flags); |
b8907339 PR |
748 | |
749 | /* solve the race between becoming unconfigured, | |
750 | * worker doing the cleanup, and | |
751 | * admin reconfiguring us: | |
752 | * on (re)configure, first set CONFIG_PENDING, | |
753 | * then wait for a potentially exiting worker, | |
754 | * start the worker, and schedule one no_op. | |
755 | * then proceed with configuration. | |
756 | */ | |
757 | if (ns.disk == D_DISKLESS && | |
758 | ns.conn == C_STANDALONE && | |
759 | ns.role == R_SECONDARY && | |
760 | !test_and_set_bit(CONFIG_PENDING, &mdev->flags)) | |
761 | set_bit(DEVICE_DYING, &mdev->flags); | |
762 | ||
763 | /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference | |
764 | * on the ldev here, to be sure the transition -> D_DISKLESS resp. | |
765 | * drbd_ldev_destroy() won't happen before our corresponding | |
766 | * after_state_ch works run, where we put_ldev again. */ | |
767 | if ((os.disk != D_FAILED && ns.disk == D_FAILED) || | |
768 | (os.disk != D_DISKLESS && ns.disk == D_DISKLESS)) | |
769 | atomic_inc(&mdev->local_cnt); | |
770 | ||
771 | mdev->state = ns; | |
772 | ||
773 | if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING) | |
774 | drbd_print_uuids(mdev, "attached to UUIDs"); | |
775 | ||
776 | wake_up(&mdev->misc_wait); | |
777 | wake_up(&mdev->state_wait); | |
2a67d8b9 | 778 | wake_up(&mdev->tconn->ping_wait); |
b8907339 PR |
779 | |
780 | /* aborted verify run. log the last position */ | |
781 | if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) && | |
782 | ns.conn < C_CONNECTED) { | |
783 | mdev->ov_start_sector = | |
784 | BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left); | |
785 | dev_info(DEV, "Online Verify reached sector %llu\n", | |
786 | (unsigned long long)mdev->ov_start_sector); | |
787 | } | |
788 | ||
789 | if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) && | |
790 | (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) { | |
791 | dev_info(DEV, "Syncer continues.\n"); | |
792 | mdev->rs_paused += (long)jiffies | |
793 | -(long)mdev->rs_mark_time[mdev->rs_last_mark]; | |
794 | if (ns.conn == C_SYNC_TARGET) | |
795 | mod_timer(&mdev->resync_timer, jiffies); | |
796 | } | |
797 | ||
798 | if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) && | |
799 | (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) { | |
800 | dev_info(DEV, "Resync suspended\n"); | |
801 | mdev->rs_mark_time[mdev->rs_last_mark] = jiffies; | |
802 | } | |
803 | ||
804 | if (os.conn == C_CONNECTED && | |
805 | (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) { | |
806 | unsigned long now = jiffies; | |
807 | int i; | |
808 | ||
809 | set_ov_position(mdev, ns.conn); | |
810 | mdev->rs_start = now; | |
811 | mdev->rs_last_events = 0; | |
812 | mdev->rs_last_sect_ev = 0; | |
813 | mdev->ov_last_oos_size = 0; | |
814 | mdev->ov_last_oos_start = 0; | |
815 | ||
816 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { | |
817 | mdev->rs_mark_left[i] = mdev->ov_left; | |
818 | mdev->rs_mark_time[i] = now; | |
819 | } | |
820 | ||
821 | drbd_rs_controller_reset(mdev); | |
822 | ||
823 | if (ns.conn == C_VERIFY_S) { | |
824 | dev_info(DEV, "Starting Online Verify from sector %llu\n", | |
825 | (unsigned long long)mdev->ov_position); | |
826 | mod_timer(&mdev->resync_timer, jiffies); | |
827 | } | |
828 | } | |
829 | ||
830 | if (get_ldev(mdev)) { | |
831 | u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND| | |
832 | MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE| | |
833 | MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY); | |
834 | ||
835 | if (test_bit(CRASHED_PRIMARY, &mdev->flags)) | |
836 | mdf |= MDF_CRASHED_PRIMARY; | |
837 | if (mdev->state.role == R_PRIMARY || | |
838 | (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY)) | |
839 | mdf |= MDF_PRIMARY_IND; | |
840 | if (mdev->state.conn > C_WF_REPORT_PARAMS) | |
841 | mdf |= MDF_CONNECTED_IND; | |
842 | if (mdev->state.disk > D_INCONSISTENT) | |
843 | mdf |= MDF_CONSISTENT; | |
844 | if (mdev->state.disk > D_OUTDATED) | |
845 | mdf |= MDF_WAS_UP_TO_DATE; | |
846 | if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT) | |
847 | mdf |= MDF_PEER_OUT_DATED; | |
848 | if (mdf != mdev->ldev->md.flags) { | |
849 | mdev->ldev->md.flags = mdf; | |
850 | drbd_md_mark_dirty(mdev); | |
851 | } | |
852 | if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT) | |
853 | drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]); | |
854 | put_ldev(mdev); | |
855 | } | |
856 | ||
857 | /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */ | |
858 | if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT && | |
859 | os.peer == R_SECONDARY && ns.peer == R_PRIMARY) | |
860 | set_bit(CONSIDER_RESYNC, &mdev->flags); | |
861 | ||
862 | /* Receiver should clean up itself */ | |
863 | if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING) | |
864 | drbd_thread_stop_nowait(&mdev->tconn->receiver); | |
865 | ||
866 | /* Now the receiver finished cleaning up itself, it should die */ | |
867 | if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE) | |
868 | drbd_thread_stop_nowait(&mdev->tconn->receiver); | |
869 | ||
870 | /* Upon network failure, we need to restart the receiver. */ | |
871 | if (os.conn > C_TEAR_DOWN && | |
872 | ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT) | |
873 | drbd_thread_restart_nowait(&mdev->tconn->receiver); | |
874 | ||
875 | /* Resume AL writing if we get a connection */ | |
876 | if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) | |
877 | drbd_resume_al(mdev); | |
878 | ||
879 | ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC); | |
880 | if (ascw) { | |
881 | ascw->os = os; | |
882 | ascw->ns = ns; | |
883 | ascw->flags = flags; | |
884 | ascw->w.cb = w_after_state_ch; | |
a21e9298 | 885 | ascw->w.mdev = mdev; |
b8907339 PR |
886 | ascw->done = done; |
887 | drbd_queue_work(&mdev->tconn->data.work, &ascw->w); | |
888 | } else { | |
bbeb641c | 889 | dev_err(DEV, "Could not kmalloc an ascw\n"); |
b8907339 PR |
890 | } |
891 | ||
892 | return rv; | |
893 | } | |
894 | ||
00d56944 | 895 | static int w_after_state_ch(struct drbd_work *w, int unused) |
b8907339 PR |
896 | { |
897 | struct after_state_chg_work *ascw = | |
898 | container_of(w, struct after_state_chg_work, w); | |
00d56944 | 899 | struct drbd_conf *mdev = w->mdev; |
b8907339 PR |
900 | |
901 | after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags); | |
902 | if (ascw->flags & CS_WAIT_COMPLETE) { | |
903 | D_ASSERT(ascw->done != NULL); | |
904 | complete(ascw->done); | |
905 | } | |
906 | kfree(ascw); | |
907 | ||
908 | return 1; | |
909 | } | |
910 | ||
911 | static void abw_start_sync(struct drbd_conf *mdev, int rv) | |
912 | { | |
913 | if (rv) { | |
914 | dev_err(DEV, "Writing the bitmap failed not starting resync.\n"); | |
915 | _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE); | |
916 | return; | |
917 | } | |
918 | ||
919 | switch (mdev->state.conn) { | |
920 | case C_STARTING_SYNC_T: | |
921 | _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); | |
922 | break; | |
923 | case C_STARTING_SYNC_S: | |
924 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
925 | break; | |
926 | } | |
927 | } | |
928 | ||
929 | int drbd_bitmap_io_from_worker(struct drbd_conf *mdev, | |
930 | int (*io_fn)(struct drbd_conf *), | |
931 | char *why, enum bm_flag flags) | |
932 | { | |
933 | int rv; | |
934 | ||
935 | D_ASSERT(current == mdev->tconn->worker.task); | |
936 | ||
937 | /* open coded non-blocking drbd_suspend_io(mdev); */ | |
938 | set_bit(SUSPEND_IO, &mdev->flags); | |
939 | ||
940 | drbd_bm_lock(mdev, why, flags); | |
941 | rv = io_fn(mdev); | |
942 | drbd_bm_unlock(mdev); | |
943 | ||
944 | drbd_resume_io(mdev); | |
945 | ||
946 | return rv; | |
947 | } | |
948 | ||
949 | /** | |
950 | * after_state_ch() - Perform after state change actions that may sleep | |
951 | * @mdev: DRBD device. | |
952 | * @os: old state. | |
953 | * @ns: new state. | |
954 | * @flags: Flags | |
955 | */ | |
956 | static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, | |
957 | union drbd_state ns, enum chg_state_flags flags) | |
958 | { | |
959 | enum drbd_fencing_p fp; | |
960 | enum drbd_req_event what = NOTHING; | |
961 | union drbd_state nsm = (union drbd_state){ .i = -1 }; | |
962 | ||
963 | if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) { | |
964 | clear_bit(CRASHED_PRIMARY, &mdev->flags); | |
965 | if (mdev->p_uuid) | |
966 | mdev->p_uuid[UI_FLAGS] &= ~((u64)2); | |
967 | } | |
968 | ||
969 | fp = FP_DONT_CARE; | |
970 | if (get_ldev(mdev)) { | |
971 | fp = mdev->ldev->dc.fencing; | |
972 | put_ldev(mdev); | |
973 | } | |
974 | ||
975 | /* Inform userspace about the change... */ | |
976 | drbd_bcast_state(mdev, ns); | |
977 | ||
978 | if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) && | |
979 | (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)) | |
980 | drbd_khelper(mdev, "pri-on-incon-degr"); | |
981 | ||
982 | /* Here we have the actions that are performed after a | |
983 | state change. This function might sleep */ | |
984 | ||
985 | nsm.i = -1; | |
986 | if (ns.susp_nod) { | |
987 | if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) | |
988 | what = RESEND; | |
989 | ||
990 | if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING) | |
991 | what = RESTART_FROZEN_DISK_IO; | |
992 | ||
993 | if (what != NOTHING) | |
994 | nsm.susp_nod = 0; | |
995 | } | |
996 | ||
997 | if (ns.susp_fen) { | |
998 | /* case1: The outdate peer handler is successful: */ | |
999 | if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) { | |
1000 | tl_clear(mdev); | |
1001 | if (test_bit(NEW_CUR_UUID, &mdev->flags)) { | |
1002 | drbd_uuid_new_current(mdev); | |
1003 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
1004 | } | |
1005 | spin_lock_irq(&mdev->tconn->req_lock); | |
1006 | _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL); | |
1007 | spin_unlock_irq(&mdev->tconn->req_lock); | |
1008 | } | |
1009 | /* case2: The connection was established again: */ | |
1010 | if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) { | |
1011 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
1012 | what = RESEND; | |
1013 | nsm.susp_fen = 0; | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | if (what != NOTHING) { | |
1018 | spin_lock_irq(&mdev->tconn->req_lock); | |
1019 | _tl_restart(mdev, what); | |
1020 | nsm.i &= mdev->state.i; | |
1021 | _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL); | |
1022 | spin_unlock_irq(&mdev->tconn->req_lock); | |
1023 | } | |
1024 | ||
1025 | /* Became sync source. With protocol >= 96, we still need to send out | |
1026 | * the sync uuid now. Need to do that before any drbd_send_state, or | |
1027 | * the other side may go "paused sync" before receiving the sync uuids, | |
1028 | * which is unexpected. */ | |
1029 | if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) && | |
1030 | (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) && | |
1031 | mdev->tconn->agreed_pro_version >= 96 && get_ldev(mdev)) { | |
1032 | drbd_gen_and_send_sync_uuid(mdev); | |
1033 | put_ldev(mdev); | |
1034 | } | |
1035 | ||
1036 | /* Do not change the order of the if above and the two below... */ | |
1037 | if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */ | |
1038 | drbd_send_uuids(mdev); | |
1039 | drbd_send_state(mdev); | |
1040 | } | |
1041 | /* No point in queuing send_bitmap if we don't have a connection | |
1042 | * anymore, so check also the _current_ state, not only the new state | |
1043 | * at the time this work was queued. */ | |
1044 | if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S && | |
1045 | mdev->state.conn == C_WF_BITMAP_S) | |
1046 | drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, | |
1047 | "send_bitmap (WFBitMapS)", | |
1048 | BM_LOCKED_TEST_ALLOWED); | |
1049 | ||
1050 | /* Lost contact to peer's copy of the data */ | |
1051 | if ((os.pdsk >= D_INCONSISTENT && | |
1052 | os.pdsk != D_UNKNOWN && | |
1053 | os.pdsk != D_OUTDATED) | |
1054 | && (ns.pdsk < D_INCONSISTENT || | |
1055 | ns.pdsk == D_UNKNOWN || | |
1056 | ns.pdsk == D_OUTDATED)) { | |
1057 | if (get_ldev(mdev)) { | |
1058 | if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) && | |
1059 | mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) { | |
1060 | if (is_susp(mdev->state)) { | |
1061 | set_bit(NEW_CUR_UUID, &mdev->flags); | |
1062 | } else { | |
1063 | drbd_uuid_new_current(mdev); | |
1064 | drbd_send_uuids(mdev); | |
1065 | } | |
1066 | } | |
1067 | put_ldev(mdev); | |
1068 | } | |
1069 | } | |
1070 | ||
1071 | if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) { | |
1072 | if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) { | |
1073 | drbd_uuid_new_current(mdev); | |
1074 | drbd_send_uuids(mdev); | |
1075 | } | |
1076 | ||
1077 | /* D_DISKLESS Peer becomes secondary */ | |
1078 | if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY) | |
1079 | /* We may still be Primary ourselves. | |
1080 | * No harm done if the bitmap still changes, | |
1081 | * redirtied pages will follow later. */ | |
1082 | drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, | |
1083 | "demote diskless peer", BM_LOCKED_SET_ALLOWED); | |
1084 | put_ldev(mdev); | |
1085 | } | |
1086 | ||
1087 | /* Write out all changed bits on demote. | |
1088 | * Though, no need to da that just yet | |
1089 | * if there is a resync going on still */ | |
1090 | if (os.role == R_PRIMARY && ns.role == R_SECONDARY && | |
1091 | mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) { | |
1092 | /* No changes to the bitmap expected this time, so assert that, | |
1093 | * even though no harm was done if it did change. */ | |
1094 | drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, | |
1095 | "demote", BM_LOCKED_TEST_ALLOWED); | |
1096 | put_ldev(mdev); | |
1097 | } | |
1098 | ||
1099 | /* Last part of the attaching process ... */ | |
1100 | if (ns.conn >= C_CONNECTED && | |
1101 | os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) { | |
1102 | drbd_send_sizes(mdev, 0, 0); /* to start sync... */ | |
1103 | drbd_send_uuids(mdev); | |
1104 | drbd_send_state(mdev); | |
1105 | } | |
1106 | ||
1107 | /* We want to pause/continue resync, tell peer. */ | |
1108 | if (ns.conn >= C_CONNECTED && | |
1109 | ((os.aftr_isp != ns.aftr_isp) || | |
1110 | (os.user_isp != ns.user_isp))) | |
1111 | drbd_send_state(mdev); | |
1112 | ||
1113 | /* In case one of the isp bits got set, suspend other devices. */ | |
1114 | if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) && | |
1115 | (ns.aftr_isp || ns.peer_isp || ns.user_isp)) | |
1116 | suspend_other_sg(mdev); | |
1117 | ||
1118 | /* Make sure the peer gets informed about eventual state | |
1119 | changes (ISP bits) while we were in WFReportParams. */ | |
1120 | if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED) | |
1121 | drbd_send_state(mdev); | |
1122 | ||
1123 | if (os.conn != C_AHEAD && ns.conn == C_AHEAD) | |
1124 | drbd_send_state(mdev); | |
1125 | ||
1126 | /* We are in the progress to start a full sync... */ | |
1127 | if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || | |
1128 | (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S)) | |
1129 | /* no other bitmap changes expected during this phase */ | |
1130 | drbd_queue_bitmap_io(mdev, | |
1131 | &drbd_bmio_set_n_write, &abw_start_sync, | |
1132 | "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED); | |
1133 | ||
1134 | /* We are invalidating our self... */ | |
1135 | if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED && | |
1136 | os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT) | |
1137 | /* other bitmap operation expected during this phase */ | |
1138 | drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, | |
1139 | "set_n_write from invalidate", BM_LOCKED_MASK); | |
1140 | ||
1141 | /* first half of local IO error, failure to attach, | |
1142 | * or administrative detach */ | |
1143 | if (os.disk != D_FAILED && ns.disk == D_FAILED) { | |
1144 | enum drbd_io_error_p eh; | |
1145 | int was_io_error; | |
1146 | /* corresponding get_ldev was in __drbd_set_state, to serialize | |
1147 | * our cleanup here with the transition to D_DISKLESS, | |
1148 | * so it is safe to dreference ldev here. */ | |
1149 | eh = mdev->ldev->dc.on_io_error; | |
1150 | was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags); | |
1151 | ||
1152 | /* current state still has to be D_FAILED, | |
1153 | * there is only one way out: to D_DISKLESS, | |
1154 | * and that may only happen after our put_ldev below. */ | |
1155 | if (mdev->state.disk != D_FAILED) | |
1156 | dev_err(DEV, | |
1157 | "ASSERT FAILED: disk is %s during detach\n", | |
1158 | drbd_disk_str(mdev->state.disk)); | |
1159 | ||
1160 | if (drbd_send_state(mdev)) | |
1161 | dev_warn(DEV, "Notified peer that I am detaching my disk\n"); | |
1162 | else | |
1163 | dev_err(DEV, "Sending state for detaching disk failed\n"); | |
1164 | ||
1165 | drbd_rs_cancel_all(mdev); | |
1166 | ||
1167 | /* In case we want to get something to stable storage still, | |
1168 | * this may be the last chance. | |
1169 | * Following put_ldev may transition to D_DISKLESS. */ | |
1170 | drbd_md_sync(mdev); | |
1171 | put_ldev(mdev); | |
1172 | ||
1173 | if (was_io_error && eh == EP_CALL_HELPER) | |
1174 | drbd_khelper(mdev, "local-io-error"); | |
1175 | } | |
1176 | ||
1177 | /* second half of local IO error, failure to attach, | |
1178 | * or administrative detach, | |
1179 | * after local_cnt references have reached zero again */ | |
1180 | if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) { | |
1181 | /* We must still be diskless, | |
1182 | * re-attach has to be serialized with this! */ | |
1183 | if (mdev->state.disk != D_DISKLESS) | |
1184 | dev_err(DEV, | |
1185 | "ASSERT FAILED: disk is %s while going diskless\n", | |
1186 | drbd_disk_str(mdev->state.disk)); | |
1187 | ||
1188 | mdev->rs_total = 0; | |
1189 | mdev->rs_failed = 0; | |
1190 | atomic_set(&mdev->rs_pending_cnt, 0); | |
1191 | ||
1192 | if (drbd_send_state(mdev)) | |
1193 | dev_warn(DEV, "Notified peer that I'm now diskless.\n"); | |
1194 | /* corresponding get_ldev in __drbd_set_state | |
1195 | * this may finally trigger drbd_ldev_destroy. */ | |
1196 | put_ldev(mdev); | |
1197 | } | |
1198 | ||
1199 | /* Notify peer that I had a local IO error, and did not detached.. */ | |
1200 | if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT) | |
1201 | drbd_send_state(mdev); | |
1202 | ||
1203 | /* Disks got bigger while they were detached */ | |
1204 | if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING && | |
1205 | test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) { | |
1206 | if (ns.conn == C_CONNECTED) | |
1207 | resync_after_online_grow(mdev); | |
1208 | } | |
1209 | ||
1210 | /* A resync finished or aborted, wake paused devices... */ | |
1211 | if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) || | |
1212 | (os.peer_isp && !ns.peer_isp) || | |
1213 | (os.user_isp && !ns.user_isp)) | |
1214 | resume_next_sg(mdev); | |
1215 | ||
1216 | /* sync target done with resync. Explicitly notify peer, even though | |
1217 | * it should (at least for non-empty resyncs) already know itself. */ | |
1218 | if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED) | |
1219 | drbd_send_state(mdev); | |
1220 | ||
1221 | /* This triggers bitmap writeout of potentially still unwritten pages | |
1222 | * if the resync finished cleanly, or aborted because of peer disk | |
1223 | * failure, or because of connection loss. | |
1224 | * For resync aborted because of local disk failure, we cannot do | |
1225 | * any bitmap writeout anymore. | |
1226 | * No harm done if some bits change during this phase. | |
1227 | */ | |
1228 | if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) { | |
1229 | drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, | |
1230 | "write from resync_finished", BM_LOCKED_SET_ALLOWED); | |
1231 | put_ldev(mdev); | |
1232 | } | |
1233 | ||
1234 | if (ns.disk == D_DISKLESS && | |
1235 | ns.conn == C_STANDALONE && | |
1236 | ns.role == R_SECONDARY) { | |
1237 | if (os.aftr_isp != ns.aftr_isp) | |
1238 | resume_next_sg(mdev); | |
1239 | } | |
1240 | ||
bbeb641c PR |
1241 | after_all_state_ch(mdev->tconn, ns); |
1242 | ||
b8907339 PR |
1243 | drbd_md_sync(mdev); |
1244 | } | |
1245 | ||
bbeb641c PR |
1246 | struct after_conn_state_chg_work { |
1247 | struct drbd_work w; | |
1248 | enum drbd_conns oc; | |
1249 | union drbd_state nms; /* new, max state, over all mdevs */ | |
1250 | enum chg_state_flags flags; | |
1251 | }; | |
1252 | ||
1253 | static void after_all_state_ch(struct drbd_tconn *tconn, union drbd_state ns) | |
b8907339 | 1254 | { |
bbeb641c PR |
1255 | if (ns.disk == D_DISKLESS && ns.conn == C_STANDALONE && 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 | } | |
1260 | ||
1261 | static int w_after_conn_state_ch(struct drbd_work *w, int unused) | |
1262 | { | |
1263 | struct after_conn_state_chg_work *acscw = | |
1264 | container_of(w, struct after_conn_state_chg_work, w); | |
1265 | struct drbd_tconn *tconn = w->tconn; | |
1266 | enum drbd_conns oc = acscw->oc; | |
1267 | union drbd_state nms = acscw->nms; | |
1268 | ||
1269 | kfree(acscw); | |
1270 | ||
b8907339 | 1271 | /* Upon network configuration, we need to start the receiver */ |
bbeb641c | 1272 | if (oc == C_STANDALONE && nms.conn == C_UNCONNECTED) |
b8907339 PR |
1273 | drbd_thread_start(&tconn->receiver); |
1274 | ||
bbeb641c PR |
1275 | //conn_err(tconn, STATE_FMT, STATE_ARGS("nms", nms)); |
1276 | after_all_state_ch(tconn, nms); | |
1277 | ||
1278 | return 1; | |
1279 | } | |
1280 | ||
1281 | static void print_conn_state_change(struct drbd_tconn *tconn, enum drbd_conns oc, enum drbd_conns nc) | |
1282 | { | |
1283 | char *pbp, pb[300]; | |
1284 | pbp = pb; | |
1285 | *pbp = 0; | |
1286 | if (nc != oc) | |
1287 | pbp += sprintf(pbp, "conn( %s -> %s ) ", | |
1288 | drbd_conn_str(oc), | |
1289 | drbd_conn_str(nc)); | |
1290 | ||
1291 | conn_info(tconn, "%s\n", pb); | |
1292 | } | |
1293 | ||
1294 | struct _is_valid_itr_params { | |
1295 | enum chg_state_flags flags; | |
1296 | union drbd_state mask, val; | |
1297 | union drbd_state ms; /* maximal state, over all mdevs */ | |
1298 | enum drbd_conns oc; | |
1299 | enum { | |
1300 | OC_UNINITIALIZED, | |
1301 | OC_CONSISTENT, | |
1302 | OC_INCONSISTENT, | |
1303 | } oc_state; | |
1304 | }; | |
1305 | ||
1306 | static int _is_valid_itr_fn(int vnr, void *p, void *data) | |
1307 | { | |
1308 | struct drbd_conf *mdev = (struct drbd_conf *)p; | |
1309 | struct _is_valid_itr_params *params = (struct _is_valid_itr_params *)data; | |
1310 | enum chg_state_flags flags = params->flags; | |
1311 | union drbd_state ns, os; | |
1312 | enum drbd_state_rv rv; | |
1313 | ||
1314 | os = mdev->state; | |
1315 | ns = apply_mask_val(os, params->mask, params->val); | |
1316 | ns = sanitize_state(mdev, ns, NULL); | |
1317 | rv = is_valid_state(mdev, ns); | |
1318 | ||
1319 | if (rv < SS_SUCCESS) { | |
1320 | /* If the old state was illegal as well, then let this happen...*/ | |
1321 | ||
1322 | if (is_valid_state(mdev, os) == rv) | |
1323 | rv = is_valid_soft_transition(os, ns); | |
1324 | } else | |
1325 | rv = is_valid_soft_transition(os, ns); | |
1326 | ||
1327 | switch (params->oc_state) { | |
1328 | case OC_UNINITIALIZED: | |
1329 | params->oc = os.conn; | |
1330 | params->oc_state = OC_CONSISTENT; | |
1331 | break; | |
1332 | case OC_CONSISTENT: | |
1333 | if (params->oc != os.conn) | |
1334 | params->oc_state = OC_INCONSISTENT; | |
1335 | break; | |
1336 | case OC_INCONSISTENT: | |
1337 | break; | |
1338 | } | |
1339 | ||
1340 | if (rv < SS_SUCCESS) { | |
1341 | if (flags & CS_VERBOSE) | |
1342 | print_st_err(mdev, os, ns, rv); | |
1343 | return rv; | |
1344 | } else | |
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | static int _set_state_itr_fn(int vnr, void *p, void *data) | |
1349 | { | |
1350 | struct drbd_conf *mdev = (struct drbd_conf *)p; | |
1351 | struct _is_valid_itr_params *params = (struct _is_valid_itr_params *)data; | |
1352 | enum chg_state_flags flags = params->flags; | |
1353 | union drbd_state os, ns, ms = params->ms; | |
1354 | enum drbd_state_rv rv; | |
1355 | ||
1356 | os = mdev->state; | |
1357 | ns = apply_mask_val(os, params->mask, params->val); | |
1358 | ns = sanitize_state(mdev, ns, NULL); | |
1359 | ||
1360 | rv = __drbd_set_state(mdev, ns, flags, NULL); | |
1361 | ||
1362 | ms.role = max_t(enum drbd_role, mdev->state.role, ms.role); | |
1363 | ms.peer = max_t(enum drbd_role, mdev->state.peer, ms.peer); | |
1364 | ms.disk = max_t(enum drbd_role, mdev->state.disk, ms.disk); | |
1365 | ms.pdsk = max_t(enum drbd_role, mdev->state.pdsk, ms.pdsk); | |
1366 | params->ms = ms; | |
1367 | ||
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | enum drbd_state_rv | |
1372 | _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val, | |
1373 | enum chg_state_flags flags) | |
1374 | { | |
1375 | enum drbd_state_rv rv = SS_SUCCESS; | |
1376 | struct _is_valid_itr_params params; | |
1377 | struct after_conn_state_chg_work *acscw; | |
1378 | enum drbd_conns oc = tconn->cstate; | |
1379 | ||
1380 | read_lock(&global_state_lock); | |
1381 | ||
1382 | rv = is_valid_conn_transition(oc, val.conn); | |
1383 | if (rv < SS_SUCCESS) | |
1384 | goto abort; | |
1385 | ||
1386 | params.flags = flags; | |
1387 | params.mask = mask; | |
1388 | params.val = val; | |
1389 | params.oc_state = OC_UNINITIALIZED; | |
1390 | ||
1391 | if (!(flags & CS_HARD)) | |
1392 | rv = idr_for_each(&tconn->volumes, _is_valid_itr_fn, ¶ms); | |
1393 | ||
1394 | if (rv == 0) /* idr_for_each semantics */ | |
1395 | rv = SS_SUCCESS; | |
1396 | ||
1397 | if (rv < SS_SUCCESS) | |
1398 | goto abort; | |
1399 | ||
1400 | if (params.oc_state == OC_CONSISTENT) { | |
1401 | oc = params.oc; | |
1402 | print_conn_state_change(tconn, oc, val.conn); | |
1403 | params.flags |= CS_NO_CSTATE_CHG; | |
1404 | } | |
1405 | tconn->cstate = val.conn; | |
1406 | params.ms.i = 0; | |
1407 | params.ms.conn = val.conn; | |
1408 | idr_for_each(&tconn->volumes, _set_state_itr_fn, ¶ms); | |
1409 | ||
1410 | acscw = kmalloc(sizeof(*acscw), GFP_ATOMIC); | |
1411 | if (acscw) { | |
1412 | acscw->oc = oc; | |
1413 | acscw->nms = params.ms; | |
1414 | acscw->flags = flags; | |
1415 | acscw->w.cb = w_after_conn_state_ch; | |
1416 | acscw->w.tconn = tconn; | |
1417 | drbd_queue_work(&tconn->data.work, &acscw->w); | |
1418 | } else { | |
1419 | conn_err(tconn, "Could not kmalloc an acscw\n"); | |
b8907339 | 1420 | } |
bbeb641c PR |
1421 | |
1422 | abort: | |
1423 | read_unlock(&global_state_lock); | |
1424 | ||
1425 | return rv; | |
1426 | } | |
1427 | ||
1428 | enum drbd_state_rv | |
1429 | conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val, | |
1430 | enum chg_state_flags flags) | |
1431 | { | |
1432 | enum drbd_state_rv rv; | |
1433 | ||
1434 | spin_lock_irq(&tconn->req_lock); | |
1435 | rv = _conn_request_state(tconn, mask, val, flags); | |
1436 | spin_unlock_irq(&tconn->req_lock); | |
1437 | ||
1438 | return rv; | |
b8907339 | 1439 | } |