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1 | /* | |
2 | * mdmon - monitor external metadata arrays | |
3 | * | |
4 | * Copyright (C) 2007-2009 Neil Brown <neilb@suse.de> | |
5 | * Copyright (C) 2007-2009 Intel Corporation | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include "mdadm.h" | |
22 | #include "mdmon.h" | |
23 | #include <sys/syscall.h> | |
24 | #include <sys/select.h> | |
25 | #include <signal.h> | |
26 | ||
27 | static char *array_states[] = { | |
28 | "clear", "inactive", "suspended", "readonly", "read-auto", | |
29 | "clean", "active", "write-pending", "active-idle", NULL }; | |
30 | static char *sync_actions[] = { | |
31 | "idle", "reshape", "resync", "recover", "check", "repair", NULL | |
32 | }; | |
33 | ||
34 | static int write_attr(char *attr, int fd) | |
35 | { | |
36 | return write(fd, attr, strlen(attr)); | |
37 | } | |
38 | ||
39 | static void add_fd(fd_set *fds, int *maxfd, int fd) | |
40 | { | |
41 | if (fd < 0) | |
42 | return; | |
43 | if (fd > *maxfd) | |
44 | *maxfd = fd; | |
45 | FD_SET(fd, fds); | |
46 | } | |
47 | ||
48 | static int read_attr(char *buf, int len, int fd) | |
49 | { | |
50 | int n; | |
51 | ||
52 | if (fd < 0) { | |
53 | buf[0] = 0; | |
54 | return 0; | |
55 | } | |
56 | lseek(fd, 0, 0); | |
57 | n = read(fd, buf, len - 1); | |
58 | ||
59 | if (n <= 0) { | |
60 | buf[0] = 0; | |
61 | return 0; | |
62 | } | |
63 | buf[n] = 0; | |
64 | if (buf[n-1] == '\n') | |
65 | buf[n-1] = 0; | |
66 | return n; | |
67 | } | |
68 | ||
69 | static unsigned long long read_resync_start(int fd) | |
70 | { | |
71 | char buf[30]; | |
72 | int n; | |
73 | ||
74 | n = read_attr(buf, 30, fd); | |
75 | if (n <= 0) | |
76 | return 0; | |
77 | if (strncmp(buf, "none", 4) == 0) | |
78 | return MaxSector; | |
79 | else | |
80 | return strtoull(buf, NULL, 10); | |
81 | } | |
82 | ||
83 | static unsigned long long read_sync_completed(int fd) | |
84 | { | |
85 | unsigned long long val; | |
86 | char buf[50]; | |
87 | int n; | |
88 | char *ep; | |
89 | ||
90 | n = read_attr(buf, 50, fd); | |
91 | ||
92 | if (n <= 0) | |
93 | return 0; | |
94 | buf[n] = 0; | |
95 | val = strtoull(buf, &ep, 0); | |
96 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
97 | return 0; | |
98 | return val; | |
99 | } | |
100 | ||
101 | static enum array_state read_state(int fd) | |
102 | { | |
103 | char buf[20]; | |
104 | int n = read_attr(buf, 20, fd); | |
105 | ||
106 | if (n <= 0) | |
107 | return bad_word; | |
108 | return (enum array_state) sysfs_match_word(buf, array_states); | |
109 | } | |
110 | ||
111 | static enum sync_action read_action( int fd) | |
112 | { | |
113 | char buf[20]; | |
114 | int n = read_attr(buf, 20, fd); | |
115 | ||
116 | if (n <= 0) | |
117 | return bad_action; | |
118 | return (enum sync_action) sysfs_match_word(buf, sync_actions); | |
119 | } | |
120 | ||
121 | int read_dev_state(int fd) | |
122 | { | |
123 | char buf[60]; | |
124 | int n = read_attr(buf, 60, fd); | |
125 | char *cp; | |
126 | int rv = 0; | |
127 | ||
128 | if (n <= 0) | |
129 | return 0; | |
130 | ||
131 | cp = buf; | |
132 | while (cp) { | |
133 | if (sysfs_attr_match(cp, "faulty")) | |
134 | rv |= DS_FAULTY; | |
135 | if (sysfs_attr_match(cp, "in_sync")) | |
136 | rv |= DS_INSYNC; | |
137 | if (sysfs_attr_match(cp, "write_mostly")) | |
138 | rv |= DS_WRITE_MOSTLY; | |
139 | if (sysfs_attr_match(cp, "spare")) | |
140 | rv |= DS_SPARE; | |
141 | if (sysfs_attr_match(cp, "blocked")) | |
142 | rv |= DS_BLOCKED; | |
143 | cp = strchr(cp, ','); | |
144 | if (cp) | |
145 | cp++; | |
146 | } | |
147 | return rv; | |
148 | } | |
149 | ||
150 | static void signal_manager(void) | |
151 | { | |
152 | /* tgkill(getpid(), mon_tid, SIGUSR1); */ | |
153 | int pid = getpid(); | |
154 | syscall(SYS_tgkill, pid, mgr_tid, SIGUSR1); | |
155 | } | |
156 | ||
157 | /* Monitor a set of active md arrays - all of which share the | |
158 | * same metadata - and respond to events that require | |
159 | * metadata update. | |
160 | * | |
161 | * New arrays are detected by another thread which allocates | |
162 | * required memory and attaches the data structure to our list. | |
163 | * | |
164 | * Events: | |
165 | * Array stops. | |
166 | * This is detected by array_state going to 'clear' or 'inactive'. | |
167 | * while we thought it was active. | |
168 | * Response is to mark metadata as clean and 'clear' the array(??) | |
169 | * write-pending | |
170 | * array_state if 'write-pending' | |
171 | * We mark metadata as 'dirty' then set array to 'active'. | |
172 | * active_idle | |
173 | * Either ignore, or mark clean, then mark metadata as clean. | |
174 | * | |
175 | * device fails | |
176 | * detected by rd-N/state reporting "faulty" | |
177 | * mark device as 'failed' in metadata, let the kernel release the | |
178 | * device by writing '-blocked' to rd/state, and finally write 'remove' to | |
179 | * rd/state. Before a disk can be replaced it must be failed and removed | |
180 | * from all container members, this will be preemptive for the other | |
181 | * arrays... safe? | |
182 | * | |
183 | * sync completes | |
184 | * sync_action was 'resync' and becomes 'idle' and resync_start becomes | |
185 | * MaxSector | |
186 | * Notify metadata that sync is complete. | |
187 | * | |
188 | * recovery completes | |
189 | * sync_action changes from 'recover' to 'idle' | |
190 | * Check each device state and mark metadata if 'faulty' or 'in_sync'. | |
191 | * | |
192 | * deal with resync | |
193 | * This only happens on finding a new array... mdadm will have set | |
194 | * 'resync_start' to the correct value. If 'resync_start' indicates that an | |
195 | * resync needs to occur set the array to the 'active' state rather than the | |
196 | * initial read-auto state. | |
197 | * | |
198 | * | |
199 | * | |
200 | * We wait for a change (poll/select) on array_state, sync_action, and | |
201 | * each rd-X/state file. | |
202 | * When we get any change, we check everything. So read each state file, | |
203 | * then decide what to do. | |
204 | * | |
205 | * The core action is to write new metadata to all devices in the array. | |
206 | * This is done at most once on any wakeup. | |
207 | * After that we might: | |
208 | * - update the array_state | |
209 | * - set the role of some devices. | |
210 | * - request a sync_action | |
211 | * | |
212 | */ | |
213 | ||
214 | static int read_and_act(struct active_array *a) | |
215 | { | |
216 | unsigned long long sync_completed; | |
217 | int check_degraded = 0; | |
218 | int check_reshape = 0; | |
219 | int deactivate = 0; | |
220 | struct mdinfo *mdi; | |
221 | int dirty = 0; | |
222 | int count = 0; | |
223 | ||
224 | a->next_state = bad_word; | |
225 | a->next_action = bad_action; | |
226 | ||
227 | a->curr_state = read_state(a->info.state_fd); | |
228 | a->curr_action = read_action(a->action_fd); | |
229 | a->info.resync_start = read_resync_start(a->resync_start_fd); | |
230 | sync_completed = read_sync_completed(a->sync_completed_fd); | |
231 | for (mdi = a->info.devs; mdi ; mdi = mdi->next) { | |
232 | mdi->next_state = 0; | |
233 | mdi->curr_state = 0; | |
234 | if (mdi->state_fd >= 0) { | |
235 | mdi->recovery_start = read_resync_start(mdi->recovery_fd); | |
236 | mdi->curr_state = read_dev_state(mdi->state_fd); | |
237 | } | |
238 | } | |
239 | ||
240 | if (a->curr_state > inactive && | |
241 | a->prev_state == inactive) { | |
242 | /* array has been started | |
243 | * possible that container operation has to be completed | |
244 | */ | |
245 | a->container->ss->set_array_state(a, 0); | |
246 | } | |
247 | if (a->curr_state <= inactive && | |
248 | a->prev_state > inactive) { | |
249 | /* array has been stopped */ | |
250 | a->container->ss->set_array_state(a, 1); | |
251 | a->next_state = clear; | |
252 | deactivate = 1; | |
253 | } | |
254 | if (a->curr_state == write_pending) { | |
255 | a->container->ss->set_array_state(a, 0); | |
256 | a->next_state = active; | |
257 | dirty = 1; | |
258 | } | |
259 | if (a->curr_state == active_idle) { | |
260 | /* Set array to 'clean' FIRST, then mark clean | |
261 | * in the metadata | |
262 | */ | |
263 | a->next_state = clean; | |
264 | dirty = 1; | |
265 | } | |
266 | if (a->curr_state == clean) { | |
267 | a->container->ss->set_array_state(a, 1); | |
268 | } | |
269 | if (a->curr_state == active || | |
270 | a->curr_state == suspended || | |
271 | a->curr_state == bad_word) | |
272 | dirty = 1; | |
273 | if (a->curr_state == readonly) { | |
274 | /* Well, I'm ready to handle things. If readonly | |
275 | * wasn't requested, transition to read-auto. | |
276 | */ | |
277 | char buf[64]; | |
278 | read_attr(buf, sizeof(buf), a->metadata_fd); | |
279 | if (strncmp(buf, "external:-", 10) == 0) { | |
280 | /* explicit request for readonly array. Leave it alone */ | |
281 | ; | |
282 | } else { | |
283 | if (a->container->ss->set_array_state(a, 2)) | |
284 | a->next_state = read_auto; /* array is clean */ | |
285 | else { | |
286 | a->next_state = active; /* Now active for recovery etc */ | |
287 | dirty = 1; | |
288 | } | |
289 | } | |
290 | } | |
291 | ||
292 | if (!deactivate && | |
293 | a->curr_action == idle && | |
294 | a->prev_action == resync) { | |
295 | /* A resync has finished. The endpoint is recorded in | |
296 | * 'sync_start'. We don't update the metadata | |
297 | * until the array goes inactive or readonly though. | |
298 | * Just check if we need to fiddle spares. | |
299 | */ | |
300 | a->container->ss->set_array_state(a, a->curr_state <= clean); | |
301 | check_degraded = 1; | |
302 | } | |
303 | ||
304 | if (!deactivate && | |
305 | a->curr_action == idle && | |
306 | a->prev_action == recover) { | |
307 | /* A recovery has finished. Some disks may be in sync now, | |
308 | * and the array may no longer be degraded | |
309 | */ | |
310 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) { | |
311 | a->container->ss->set_disk(a, mdi->disk.raid_disk, | |
312 | mdi->curr_state); | |
313 | if (! (mdi->curr_state & DS_INSYNC)) | |
314 | check_degraded = 1; | |
315 | count++; | |
316 | } | |
317 | if (count != a->info.array.raid_disks) | |
318 | check_degraded = 1; | |
319 | } | |
320 | ||
321 | if (!deactivate && | |
322 | a->curr_action == reshape && | |
323 | a->prev_action != reshape) | |
324 | /* reshape was requested by mdadm. Need to see if | |
325 | * new devices have been added. Manager does that | |
326 | * when it sees check_reshape | |
327 | */ | |
328 | check_reshape = 1; | |
329 | ||
330 | /* Check for failures and if found: | |
331 | * 1/ Record the failure in the metadata and unblock the device. | |
332 | * FIXME update the kernel to stop notifying on failed drives when | |
333 | * the array is readonly and we have cleared 'blocked' | |
334 | * 2/ Try to remove the device if the array is writable, or can be | |
335 | * made writable. | |
336 | */ | |
337 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) { | |
338 | if (mdi->curr_state & DS_FAULTY) { | |
339 | a->container->ss->set_disk(a, mdi->disk.raid_disk, | |
340 | mdi->curr_state); | |
341 | check_degraded = 1; | |
342 | mdi->next_state |= DS_UNBLOCK; | |
343 | if (a->curr_state == read_auto) { | |
344 | a->container->ss->set_array_state(a, 0); | |
345 | a->next_state = active; | |
346 | } | |
347 | if (a->curr_state > readonly) | |
348 | mdi->next_state |= DS_REMOVE; | |
349 | } | |
350 | } | |
351 | ||
352 | /* Check for recovery checkpoint notifications. We need to be a | |
353 | * minimum distance away from the last checkpoint to prevent | |
354 | * over checkpointing. Note reshape checkpointing is handled | |
355 | * in the second branch. | |
356 | */ | |
357 | if (sync_completed > a->last_checkpoint && | |
358 | sync_completed - a->last_checkpoint > a->info.component_size >> 4 && | |
359 | a->curr_action > reshape) { | |
360 | /* A (non-reshape) sync_action has reached a checkpoint. | |
361 | * Record the updated position in the metadata | |
362 | */ | |
363 | a->last_checkpoint = sync_completed; | |
364 | a->container->ss->set_array_state(a, a->curr_state <= clean); | |
365 | } else if ((a->curr_action == idle && a->prev_action == reshape) || | |
366 | (a->curr_action == reshape | |
367 | && sync_completed > a->last_checkpoint) ) { | |
368 | /* Reshape has progressed or completed so we need to | |
369 | * update the array state - and possibly the array size | |
370 | */ | |
371 | if (sync_completed != 0) | |
372 | a->last_checkpoint = sync_completed; | |
373 | /* We might need to update last_checkpoint depending on | |
374 | * the reason that reshape finished. | |
375 | * if array reshape is really finished: | |
376 | * set check point to the end, this allows | |
377 | * set_array_state() to finalize reshape in metadata | |
378 | * if reshape if broken: do not set checkpoint to the end | |
379 | * this allows for reshape restart from checkpoint | |
380 | */ | |
381 | if ((a->curr_action != reshape) && | |
382 | (a->prev_action == reshape)) { | |
383 | char buf[40]; | |
384 | if ((sysfs_get_str(&a->info, NULL, | |
385 | "reshape_position", | |
386 | buf, | |
387 | sizeof(buf)) >= 0) && | |
388 | strncmp(buf, "none", 4) == 0) | |
389 | a->last_checkpoint = a->info.component_size; | |
390 | } | |
391 | a->container->ss->set_array_state(a, a->curr_state <= clean); | |
392 | a->last_checkpoint = sync_completed; | |
393 | } | |
394 | ||
395 | if (sync_completed > a->last_checkpoint) | |
396 | a->last_checkpoint = sync_completed; | |
397 | ||
398 | a->container->ss->sync_metadata(a->container); | |
399 | dprintf("%s(%d): state:%s action:%s next(", __func__, a->info.container_member, | |
400 | array_states[a->curr_state], sync_actions[a->curr_action]); | |
401 | ||
402 | /* Effect state changes in the array */ | |
403 | if (a->next_state != bad_word) { | |
404 | dprintf(" state:%s", array_states[a->next_state]); | |
405 | write_attr(array_states[a->next_state], a->info.state_fd); | |
406 | } | |
407 | if (a->next_action != bad_action) { | |
408 | write_attr(sync_actions[a->next_action], a->action_fd); | |
409 | dprintf(" action:%s", sync_actions[a->next_action]); | |
410 | } | |
411 | for (mdi = a->info.devs; mdi ; mdi = mdi->next) { | |
412 | if (mdi->next_state & DS_UNBLOCK) { | |
413 | dprintf(" %d:-blocked", mdi->disk.raid_disk); | |
414 | write_attr("-blocked", mdi->state_fd); | |
415 | } | |
416 | ||
417 | if ((mdi->next_state & DS_REMOVE) && mdi->state_fd >= 0) { | |
418 | int remove_result; | |
419 | ||
420 | /* the kernel may not be able to immediately remove the | |
421 | * disk, we can simply wait until the next event to try | |
422 | * again. | |
423 | */ | |
424 | remove_result = write_attr("remove", mdi->state_fd); | |
425 | if (remove_result > 0) { | |
426 | dprintf(" %d:removed", mdi->disk.raid_disk); | |
427 | close(mdi->state_fd); | |
428 | close(mdi->recovery_fd); | |
429 | mdi->state_fd = -1; | |
430 | } | |
431 | } | |
432 | if (mdi->next_state & DS_INSYNC) { | |
433 | write_attr("+in_sync", mdi->state_fd); | |
434 | dprintf(" %d:+in_sync", mdi->disk.raid_disk); | |
435 | } | |
436 | } | |
437 | dprintf(" )\n"); | |
438 | ||
439 | /* move curr_ to prev_ */ | |
440 | a->prev_state = a->curr_state; | |
441 | ||
442 | a->prev_action = a->curr_action; | |
443 | ||
444 | for (mdi = a->info.devs; mdi ; mdi = mdi->next) { | |
445 | mdi->prev_state = mdi->curr_state; | |
446 | mdi->next_state = 0; | |
447 | } | |
448 | ||
449 | if (check_degraded || check_reshape) { | |
450 | /* manager will do the actual check */ | |
451 | if (check_degraded) | |
452 | a->check_degraded = 1; | |
453 | if (check_reshape) | |
454 | a->check_reshape = 1; | |
455 | signal_manager(); | |
456 | } | |
457 | ||
458 | if (deactivate) | |
459 | a->container = NULL; | |
460 | ||
461 | return dirty; | |
462 | } | |
463 | ||
464 | static struct mdinfo * | |
465 | find_device(struct active_array *a, int major, int minor) | |
466 | { | |
467 | struct mdinfo *mdi; | |
468 | ||
469 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) | |
470 | if (mdi->disk.major == major && mdi->disk.minor == minor) | |
471 | return mdi; | |
472 | ||
473 | return NULL; | |
474 | } | |
475 | ||
476 | static void reconcile_failed(struct active_array *aa, struct mdinfo *failed) | |
477 | { | |
478 | struct active_array *a; | |
479 | struct mdinfo *victim; | |
480 | ||
481 | for (a = aa; a; a = a->next) { | |
482 | if (!a->container || a->to_remove) | |
483 | continue; | |
484 | victim = find_device(a, failed->disk.major, failed->disk.minor); | |
485 | if (!victim) | |
486 | continue; | |
487 | ||
488 | if (!(victim->curr_state & DS_FAULTY)) | |
489 | write_attr("faulty", victim->state_fd); | |
490 | } | |
491 | } | |
492 | ||
493 | #ifdef DEBUG | |
494 | static void dprint_wake_reasons(fd_set *fds) | |
495 | { | |
496 | int i; | |
497 | char proc_path[256]; | |
498 | char link[256]; | |
499 | char *basename; | |
500 | int rv; | |
501 | ||
502 | fprintf(stderr, "monitor: wake ( "); | |
503 | for (i = 0; i < FD_SETSIZE; i++) { | |
504 | if (FD_ISSET(i, fds)) { | |
505 | sprintf(proc_path, "/proc/%d/fd/%d", | |
506 | (int) getpid(), i); | |
507 | ||
508 | rv = readlink(proc_path, link, sizeof(link) - 1); | |
509 | if (rv < 0) { | |
510 | fprintf(stderr, "%d:unknown ", i); | |
511 | continue; | |
512 | } | |
513 | link[rv] = '\0'; | |
514 | basename = strrchr(link, '/'); | |
515 | fprintf(stderr, "%d:%s ", | |
516 | i, basename ? ++basename : link); | |
517 | } | |
518 | } | |
519 | fprintf(stderr, ")\n"); | |
520 | } | |
521 | #endif | |
522 | ||
523 | int monitor_loop_cnt; | |
524 | ||
525 | static int wait_and_act(struct supertype *container, int nowait) | |
526 | { | |
527 | fd_set rfds; | |
528 | int maxfd = 0; | |
529 | struct active_array **aap = &container->arrays; | |
530 | struct active_array *a, **ap; | |
531 | int rv; | |
532 | struct mdinfo *mdi; | |
533 | static unsigned int dirty_arrays = ~0; /* start at some non-zero value */ | |
534 | ||
535 | FD_ZERO(&rfds); | |
536 | ||
537 | for (ap = aap ; *ap ;) { | |
538 | a = *ap; | |
539 | /* once an array has been deactivated we want to | |
540 | * ask the manager to discard it. | |
541 | */ | |
542 | if (!a->container || a->to_remove) { | |
543 | if (discard_this) { | |
544 | ap = &(*ap)->next; | |
545 | continue; | |
546 | } | |
547 | *ap = a->next; | |
548 | a->next = NULL; | |
549 | discard_this = a; | |
550 | signal_manager(); | |
551 | continue; | |
552 | } | |
553 | ||
554 | add_fd(&rfds, &maxfd, a->info.state_fd); | |
555 | add_fd(&rfds, &maxfd, a->action_fd); | |
556 | add_fd(&rfds, &maxfd, a->sync_completed_fd); | |
557 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) | |
558 | add_fd(&rfds, &maxfd, mdi->state_fd); | |
559 | ||
560 | ap = &(*ap)->next; | |
561 | } | |
562 | ||
563 | if (manager_ready && (*aap == NULL || (sigterm && !dirty_arrays))) { | |
564 | /* No interesting arrays, or we have been told to | |
565 | * terminate and everything is clean. Lets see about | |
566 | * exiting. Note that blocking at this point is not a | |
567 | * problem as there are no active arrays, there is | |
568 | * nothing that we need to be ready to do. | |
569 | */ | |
570 | int fd; | |
571 | if (sigterm) | |
572 | fd = open_dev_excl(container->devnum); | |
573 | else | |
574 | fd = open_dev_flags(container->devnum, O_RDONLY|O_EXCL); | |
575 | if (fd >= 0 || errno != EBUSY) { | |
576 | /* OK, we are safe to leave */ | |
577 | if (sigterm && !dirty_arrays) | |
578 | dprintf("caught sigterm, all clean... exiting\n"); | |
579 | else | |
580 | dprintf("no arrays to monitor... exiting\n"); | |
581 | if (!sigterm) | |
582 | /* On SIGTERM, someone (the take-over mdmon) will | |
583 | * clean up | |
584 | */ | |
585 | remove_pidfile(container->devname); | |
586 | exit_now = 1; | |
587 | signal_manager(); | |
588 | close(fd); | |
589 | exit(0); | |
590 | } | |
591 | } | |
592 | ||
593 | if (!nowait) { | |
594 | sigset_t set; | |
595 | struct timespec ts; | |
596 | ts.tv_sec = 24*3600; | |
597 | ts.tv_nsec = 0; | |
598 | if (*aap == NULL) { | |
599 | /* just waiting to get O_EXCL access */ | |
600 | ts.tv_sec = 0; | |
601 | ts.tv_nsec = 20000000ULL; | |
602 | } | |
603 | sigprocmask(SIG_UNBLOCK, NULL, &set); | |
604 | sigdelset(&set, SIGUSR1); | |
605 | monitor_loop_cnt |= 1; | |
606 | rv = pselect(maxfd+1, NULL, NULL, &rfds, &ts, &set); | |
607 | monitor_loop_cnt += 1; | |
608 | if (rv == -1 && errno == EINTR) | |
609 | rv = 0; | |
610 | #ifdef DEBUG | |
611 | dprint_wake_reasons(&rfds); | |
612 | #endif | |
613 | ||
614 | } | |
615 | ||
616 | if (update_queue) { | |
617 | struct metadata_update *this; | |
618 | ||
619 | for (this = update_queue; this ; this = this->next) | |
620 | container->ss->process_update(container, this); | |
621 | ||
622 | update_queue_handled = update_queue; | |
623 | update_queue = NULL; | |
624 | signal_manager(); | |
625 | container->ss->sync_metadata(container); | |
626 | } | |
627 | ||
628 | rv = 0; | |
629 | dirty_arrays = 0; | |
630 | for (a = *aap; a ; a = a->next) { | |
631 | int is_dirty; | |
632 | ||
633 | if (a->replaces && !discard_this) { | |
634 | struct active_array **ap; | |
635 | for (ap = &a->next; *ap && *ap != a->replaces; | |
636 | ap = & (*ap)->next) | |
637 | ; | |
638 | if (*ap) | |
639 | *ap = (*ap)->next; | |
640 | discard_this = a->replaces; | |
641 | a->replaces = NULL; | |
642 | /* FIXME check if device->state_fd need to be cleared?*/ | |
643 | signal_manager(); | |
644 | } | |
645 | if (a->container && !a->to_remove) { | |
646 | is_dirty = read_and_act(a); | |
647 | rv |= 1; | |
648 | dirty_arrays += is_dirty; | |
649 | /* when terminating stop manipulating the array after it | |
650 | * is clean, but make sure read_and_act() is given a | |
651 | * chance to handle 'active_idle' | |
652 | */ | |
653 | if (sigterm && !is_dirty) | |
654 | a->container = NULL; /* stop touching this array */ | |
655 | } | |
656 | } | |
657 | ||
658 | /* propagate failures across container members */ | |
659 | for (a = *aap; a ; a = a->next) { | |
660 | if (!a->container || a->to_remove) | |
661 | continue; | |
662 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) | |
663 | if (mdi->curr_state & DS_FAULTY) | |
664 | reconcile_failed(*aap, mdi); | |
665 | } | |
666 | ||
667 | return rv; | |
668 | } | |
669 | ||
670 | void do_monitor(struct supertype *container) | |
671 | { | |
672 | int rv; | |
673 | int first = 1; | |
674 | do { | |
675 | rv = wait_and_act(container, first); | |
676 | first = 0; | |
677 | } while (rv >= 0); | |
678 | } |