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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 | /* | |
22 | * The management thread for monitoring active md arrays. | |
23 | * This thread does things which might block such as memory | |
24 | * allocation. | |
25 | * In particular: | |
26 | * | |
27 | * - Find out about new arrays in this container. | |
28 | * Allocate the data structures and open the files. | |
29 | * | |
30 | * For this we watch /proc/mdstat and find new arrays with | |
31 | * metadata type that confirms sharing. e.g. "md4" | |
32 | * When we find a new array we slip it into the list of | |
33 | * arrays and signal 'monitor' by writing to a pipe. | |
34 | * | |
35 | * - Respond to reshape requests by allocating new data structures | |
36 | * and opening new files. | |
37 | * | |
38 | * These come as a change to raid_disks. We allocate a new | |
39 | * version of the data structures and slip it into the list. | |
40 | * 'monitor' will notice and release the old version. | |
41 | * Changes to level, chunksize, layout.. do not need re-allocation. | |
42 | * Reductions in raid_disks don't really either, but we handle | |
43 | * them the same way for consistency. | |
44 | * | |
45 | * - When a device is added to the container, we add it to the metadata | |
46 | * as a spare. | |
47 | * | |
48 | * - Deal with degraded array | |
49 | * We only do this when first noticing the array is degraded. | |
50 | * This can be when we first see the array, when sync completes or | |
51 | * when recovery completes. | |
52 | * | |
53 | * Check if number of failed devices suggests recovery is needed, and | |
54 | * skip if not. | |
55 | * Ask metadata to allocate a spare device | |
56 | * Add device as not in_sync and give a role | |
57 | * Update metadata. | |
58 | * Open sysfs files and pass to monitor. | |
59 | * Make sure that monitor Starts recovery.... | |
60 | * | |
61 | * - Pass on metadata updates from external programs such as | |
62 | * mdadm creating a new array. | |
63 | * | |
64 | * This is most-messy. | |
65 | * It might involve adding a new array or changing the status of | |
66 | * a spare, or any reconfig that the kernel doesn't get involved in. | |
67 | * | |
68 | * The required updates are received via a named pipe. There will | |
69 | * be one named pipe for each container. Each message contains a | |
70 | * sync marker: 0x5a5aa5a5, A byte count, and the message. This is | |
71 | * passed to the metadata handler which will interpret and process it. | |
72 | * For 'DDF' messages are internal data blocks with the leading | |
73 | * 'magic number' signifying what sort of data it is. | |
74 | * | |
75 | */ | |
76 | ||
77 | /* | |
78 | * We select on /proc/mdstat and the named pipe. | |
79 | * We create new arrays or updated version of arrays and slip | |
80 | * them into the head of the list, then signal 'monitor' via a pipe write. | |
81 | * 'monitor' will notice and place the old array on a return list. | |
82 | * Metadata updates are placed on a queue just like they arrive | |
83 | * from the named pipe. | |
84 | * | |
85 | * When new arrays are found based on correct metadata string, we | |
86 | * need to identify them with an entry in the metadata. Maybe we require | |
87 | * the metadata to be mdX/NN when NN is the index into an appropriate table. | |
88 | * | |
89 | */ | |
90 | ||
91 | /* | |
92 | * List of tasks: | |
93 | * - Watch for spares to be added to the container, and write updated | |
94 | * metadata to them. | |
95 | * - Watch for new arrays using this container, confirm they match metadata | |
96 | * and if so, start monitoring them | |
97 | * - Watch for spares being added to monitored arrays. This shouldn't | |
98 | * happen, as we should do all the adding. Just remove them. | |
99 | * - Watch for change in raid-disks, chunk-size, etc. Update metadata and | |
100 | * start a reshape. | |
101 | */ | |
102 | #ifndef _GNU_SOURCE | |
103 | #define _GNU_SOURCE | |
104 | #endif | |
105 | #include "mdadm.h" | |
106 | #include "mdmon.h" | |
107 | #include <sys/syscall.h> | |
108 | #include <sys/socket.h> | |
109 | #include <signal.h> | |
110 | ||
111 | static void close_aa(struct active_array *aa) | |
112 | { | |
113 | struct mdinfo *d; | |
114 | ||
115 | for (d = aa->info.devs; d; d = d->next) | |
116 | close(d->state_fd); | |
117 | ||
118 | close(aa->action_fd); | |
119 | close(aa->info.state_fd); | |
120 | close(aa->resync_start_fd); | |
121 | } | |
122 | ||
123 | static void free_aa(struct active_array *aa) | |
124 | { | |
125 | /* Note that this doesn't close fds if they are being used | |
126 | * by a clone. ->container will be set for a clone | |
127 | */ | |
128 | dprintf("%s: devnum: %d\n", __func__, aa->devnum); | |
129 | if (!aa->container) | |
130 | close_aa(aa); | |
131 | while (aa->info.devs) { | |
132 | struct mdinfo *d = aa->info.devs; | |
133 | aa->info.devs = d->next; | |
134 | free(d); | |
135 | } | |
136 | free(aa); | |
137 | } | |
138 | ||
139 | static struct active_array *duplicate_aa(struct active_array *aa) | |
140 | { | |
141 | struct active_array *newa = malloc(sizeof(*newa)); | |
142 | struct mdinfo **dp1, **dp2; | |
143 | ||
144 | *newa = *aa; | |
145 | newa->next = NULL; | |
146 | newa->replaces = NULL; | |
147 | newa->info.next = NULL; | |
148 | ||
149 | dp2 = &newa->info.devs; | |
150 | ||
151 | for (dp1 = &aa->info.devs; *dp1; dp1 = &(*dp1)->next) { | |
152 | struct mdinfo *d; | |
153 | if ((*dp1)->state_fd < 0) | |
154 | continue; | |
155 | ||
156 | d = malloc(sizeof(*d)); | |
157 | *d = **dp1; | |
158 | *dp2 = d; | |
159 | dp2 = & d->next; | |
160 | } | |
161 | *dp2 = NULL; | |
162 | ||
163 | return newa; | |
164 | } | |
165 | ||
166 | static void wakeup_monitor(void) | |
167 | { | |
168 | /* tgkill(getpid(), mon_tid, SIGUSR1); */ | |
169 | int pid = getpid(); | |
170 | syscall(SYS_tgkill, pid, mon_tid, SIGUSR1); | |
171 | } | |
172 | ||
173 | static void remove_old(void) | |
174 | { | |
175 | if (discard_this) { | |
176 | discard_this->next = NULL; | |
177 | free_aa(discard_this); | |
178 | if (pending_discard == discard_this) | |
179 | pending_discard = NULL; | |
180 | discard_this = NULL; | |
181 | wakeup_monitor(); | |
182 | } | |
183 | } | |
184 | ||
185 | static void replace_array(struct supertype *container, | |
186 | struct active_array *old, | |
187 | struct active_array *new) | |
188 | { | |
189 | /* To replace an array, we add it to the top of the list | |
190 | * marked with ->replaces to point to the original. | |
191 | * 'monitor' will take the original out of the list | |
192 | * and put it on 'discard_this'. We take it from there | |
193 | * and discard it. | |
194 | */ | |
195 | remove_old(); | |
196 | while (pending_discard) { | |
197 | while (discard_this == NULL) | |
198 | sleep(1); | |
199 | remove_old(); | |
200 | } | |
201 | pending_discard = old; | |
202 | new->replaces = old; | |
203 | new->next = container->arrays; | |
204 | container->arrays = new; | |
205 | wakeup_monitor(); | |
206 | } | |
207 | ||
208 | struct metadata_update *update_queue = NULL; | |
209 | struct metadata_update *update_queue_handled = NULL; | |
210 | struct metadata_update *update_queue_pending = NULL; | |
211 | ||
212 | void check_update_queue(struct supertype *container) | |
213 | { | |
214 | while (update_queue_handled) { | |
215 | struct metadata_update *this = update_queue_handled; | |
216 | update_queue_handled = this->next; | |
217 | free(this->buf); | |
218 | if (this->space) | |
219 | free(this->space); | |
220 | free(this); | |
221 | } | |
222 | if (update_queue == NULL && | |
223 | update_queue_pending) { | |
224 | update_queue = update_queue_pending; | |
225 | update_queue_pending = NULL; | |
226 | wakeup_monitor(); | |
227 | } | |
228 | } | |
229 | ||
230 | static void queue_metadata_update(struct metadata_update *mu) | |
231 | { | |
232 | struct metadata_update **qp; | |
233 | ||
234 | qp = &update_queue_pending; | |
235 | while (*qp) | |
236 | qp = & ((*qp)->next); | |
237 | *qp = mu; | |
238 | } | |
239 | ||
240 | static void add_disk_to_container(struct supertype *st, struct mdinfo *sd) | |
241 | { | |
242 | int dfd; | |
243 | char nm[20]; | |
244 | struct supertype *st2; | |
245 | struct metadata_update *update = NULL; | |
246 | struct mdinfo info; | |
247 | mdu_disk_info_t dk = { | |
248 | .number = -1, | |
249 | .major = sd->disk.major, | |
250 | .minor = sd->disk.minor, | |
251 | .raid_disk = -1, | |
252 | .state = 0, | |
253 | }; | |
254 | ||
255 | dprintf("%s: add %d:%d to container\n", | |
256 | __func__, sd->disk.major, sd->disk.minor); | |
257 | ||
258 | sd->next = st->devs; | |
259 | st->devs = sd; | |
260 | ||
261 | sprintf(nm, "%d:%d", sd->disk.major, sd->disk.minor); | |
262 | dfd = dev_open(nm, O_RDWR); | |
263 | if (dfd < 0) | |
264 | return; | |
265 | ||
266 | /* Check the metadata and see if it is already part of this | |
267 | * array | |
268 | */ | |
269 | st2 = dup_super(st); | |
270 | if (st2->ss->load_super(st2, dfd, NULL) == 0) { | |
271 | st2->ss->getinfo_super(st, &info); | |
272 | if (st->ss->compare_super(st, st2) == 0 && | |
273 | info.disk.raid_disk >= 0) { | |
274 | /* Looks like a good member of array. | |
275 | * Just accept it. | |
276 | * mdadm will incorporate any parts into | |
277 | * active arrays. | |
278 | */ | |
279 | st2->ss->free_super(st2); | |
280 | return; | |
281 | } | |
282 | } | |
283 | st2->ss->free_super(st2); | |
284 | ||
285 | st->update_tail = &update; | |
286 | st->ss->add_to_super(st, &dk, dfd, NULL); | |
287 | st->ss->write_init_super(st); | |
288 | queue_metadata_update(update); | |
289 | st->update_tail = NULL; | |
290 | } | |
291 | ||
292 | static void manage_container(struct mdstat_ent *mdstat, | |
293 | struct supertype *container) | |
294 | { | |
295 | /* The only thing of interest here is if a new device | |
296 | * has been added to the container. We add it to the | |
297 | * array ignoring any metadata on it. | |
298 | * FIXME should we look for compatible metadata and take hints | |
299 | * about spare assignment.... probably not. | |
300 | */ | |
301 | if (mdstat->devcnt != container->devcnt) { | |
302 | struct mdinfo **cdp, *cd, *di, *mdi; | |
303 | int found; | |
304 | ||
305 | /* read /sys/block/NAME/md/dev-??/block/dev to find out | |
306 | * what is there, and compare with container->info.devs | |
307 | * To see what is removed and what is added. | |
308 | * These need to be remove from, or added to, the array | |
309 | */ | |
310 | mdi = sysfs_read(-1, mdstat->devnum, GET_DEVS|SKIP_GONE_DEVS); | |
311 | if (!mdi) { | |
312 | /* invalidate the current count so we can try again */ | |
313 | container->devcnt = -1; | |
314 | return; | |
315 | } | |
316 | ||
317 | /* check for removals */ | |
318 | for (cdp = &container->devs; *cdp; ) { | |
319 | found = 0; | |
320 | for (di = mdi->devs; di; di = di->next) | |
321 | if (di->disk.major == (*cdp)->disk.major && | |
322 | di->disk.minor == (*cdp)->disk.minor) { | |
323 | found = 1; | |
324 | break; | |
325 | } | |
326 | if (!found) { | |
327 | cd = *cdp; | |
328 | *cdp = (*cdp)->next; | |
329 | free(cd); | |
330 | } else | |
331 | cdp = &(*cdp)->next; | |
332 | } | |
333 | ||
334 | /* check for additions */ | |
335 | for (di = mdi->devs; di; di = di->next) { | |
336 | for (cd = container->devs; cd; cd = cd->next) | |
337 | if (di->disk.major == cd->disk.major && | |
338 | di->disk.minor == cd->disk.minor) | |
339 | break; | |
340 | if (!cd) { | |
341 | struct mdinfo *newd = malloc(sizeof(*newd)); | |
342 | ||
343 | if (!newd) { | |
344 | container->devcnt = -1; | |
345 | continue; | |
346 | } | |
347 | *newd = *di; | |
348 | add_disk_to_container(container, newd); | |
349 | } | |
350 | } | |
351 | sysfs_free(mdi); | |
352 | container->devcnt = mdstat->devcnt; | |
353 | } | |
354 | } | |
355 | ||
356 | static void manage_member(struct mdstat_ent *mdstat, | |
357 | struct active_array *a) | |
358 | { | |
359 | /* Compare mdstat info with known state of member array. | |
360 | * We do not need to look for device state changes here, that | |
361 | * is dealt with by the monitor. | |
362 | * | |
363 | * We just look for changes which suggest that a reshape is | |
364 | * being requested. | |
365 | * Unfortunately decreases in raid_disks don't show up in | |
366 | * mdstat until the reshape completes FIXME. | |
367 | * | |
368 | * Actually, we also want to handle degraded arrays here by | |
369 | * trying to find and assign a spare. | |
370 | * We do that whenever the monitor tells us too. | |
371 | */ | |
372 | // FIXME | |
373 | a->info.array.raid_disks = mdstat->raid_disks; | |
374 | a->info.array.chunk_size = mdstat->chunk_size; | |
375 | // MORE | |
376 | ||
377 | if (a->check_degraded) { | |
378 | struct metadata_update *updates = NULL; | |
379 | struct mdinfo *newdev; | |
380 | struct active_array *newa; | |
381 | ||
382 | a->check_degraded = 0; | |
383 | ||
384 | /* The array may not be degraded, this is just a good time | |
385 | * to check. | |
386 | */ | |
387 | newdev = a->container->ss->activate_spare(a, &updates); | |
388 | if (newdev) { | |
389 | struct mdinfo *d; | |
390 | /* Cool, we can add a device or several. */ | |
391 | newa = duplicate_aa(a); | |
392 | /* suspend recovery - maybe not needed */ | |
393 | ||
394 | /* Add device to array and set offset/size/slot. | |
395 | * and open files for each newdev */ | |
396 | for (d = newdev; d ; d = d->next) { | |
397 | struct mdinfo *newd; | |
398 | if (sysfs_add_disk(&newa->info, d, 0) < 0) | |
399 | continue; | |
400 | newd = malloc(sizeof(*newd)); | |
401 | *newd = *d; | |
402 | newd->next = newa->info.devs; | |
403 | newa->info.devs = newd; | |
404 | ||
405 | newd->state_fd = sysfs_open(a->devnum, | |
406 | newd->sys_name, | |
407 | "state"); | |
408 | newd->prev_state | |
409 | = read_dev_state(newd->state_fd); | |
410 | newd->curr_state = newd->prev_state; | |
411 | } | |
412 | queue_metadata_update(updates); | |
413 | replace_array(a->container, a, newa); | |
414 | sysfs_set_str(&a->info, NULL, "sync_action", "recover"); | |
415 | } | |
416 | } | |
417 | } | |
418 | ||
419 | static int aa_ready(struct active_array *aa) | |
420 | { | |
421 | struct mdinfo *d; | |
422 | int level = aa->info.array.level; | |
423 | ||
424 | for (d = aa->info.devs; d; d = d->next) | |
425 | if (d->state_fd < 0) | |
426 | return 0; | |
427 | ||
428 | if (aa->info.state_fd < 0) | |
429 | return 0; | |
430 | ||
431 | if (level > 0 && (aa->action_fd < 0 || aa->resync_start_fd < 0)) | |
432 | return 0; | |
433 | ||
434 | if (!aa->container) | |
435 | return 0; | |
436 | ||
437 | return 1; | |
438 | } | |
439 | ||
440 | static void manage_new(struct mdstat_ent *mdstat, | |
441 | struct supertype *container, | |
442 | struct active_array *victim) | |
443 | { | |
444 | /* A new array has appeared in this container. | |
445 | * Hopefully it is already recorded in the metadata. | |
446 | * Check, then create the new array to report it to | |
447 | * the monitor. | |
448 | */ | |
449 | ||
450 | struct active_array *new; | |
451 | struct mdinfo *mdi, *di; | |
452 | char *inst; | |
453 | int i; | |
454 | int failed = 0; | |
455 | ||
456 | /* check if array is ready to be monitored */ | |
457 | if (!mdstat->active) | |
458 | return; | |
459 | ||
460 | mdi = sysfs_read(-1, mdstat->devnum, | |
461 | GET_LEVEL|GET_CHUNK|GET_DISKS|GET_COMPONENT| | |
462 | GET_DEGRADED|GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE); | |
463 | ||
464 | new = malloc(sizeof(*new)); | |
465 | ||
466 | if (!new || !mdi) { | |
467 | if (mdi) | |
468 | sysfs_free(mdi); | |
469 | if (new) | |
470 | free(new); | |
471 | return; | |
472 | } | |
473 | memset(new, 0, sizeof(*new)); | |
474 | ||
475 | new->devnum = mdstat->devnum; | |
476 | strcpy(new->info.sys_name, devnum2devname(new->devnum)); | |
477 | ||
478 | new->prev_state = new->curr_state = new->next_state = inactive; | |
479 | new->prev_action= new->curr_action= new->next_action= idle; | |
480 | ||
481 | new->container = container; | |
482 | ||
483 | inst = &mdstat->metadata_version[10+strlen(container->devname)+1]; | |
484 | ||
485 | new->info.array = mdi->array; | |
486 | new->info.component_size = mdi->component_size; | |
487 | ||
488 | for (i = 0; i < new->info.array.raid_disks; i++) { | |
489 | struct mdinfo *newd = malloc(sizeof(*newd)); | |
490 | ||
491 | for (di = mdi->devs; di; di = di->next) | |
492 | if (i == di->disk.raid_disk) | |
493 | break; | |
494 | ||
495 | if (di && newd) { | |
496 | memcpy(newd, di, sizeof(*newd)); | |
497 | ||
498 | newd->state_fd = sysfs_open(new->devnum, | |
499 | newd->sys_name, | |
500 | "state"); | |
501 | ||
502 | newd->prev_state = read_dev_state(newd->state_fd); | |
503 | newd->curr_state = newd->prev_state; | |
504 | } else { | |
505 | if (newd) | |
506 | free(newd); | |
507 | ||
508 | failed++; | |
509 | if (failed > new->info.array.failed_disks) { | |
510 | /* we cannot properly monitor without all working disks */ | |
511 | new->container = NULL; | |
512 | break; | |
513 | } | |
514 | continue; | |
515 | } | |
516 | sprintf(newd->sys_name, "rd%d", i); | |
517 | newd->next = new->info.devs; | |
518 | new->info.devs = newd; | |
519 | } | |
520 | ||
521 | new->action_fd = sysfs_open(new->devnum, NULL, "sync_action"); | |
522 | new->info.state_fd = sysfs_open(new->devnum, NULL, "array_state"); | |
523 | new->resync_start_fd = sysfs_open(new->devnum, NULL, "resync_start"); | |
524 | new->metadata_fd = sysfs_open(new->devnum, NULL, "metadata_version"); | |
525 | get_resync_start(new); | |
526 | dprintf("%s: inst: %d action: %d state: %d\n", __func__, atoi(inst), | |
527 | new->action_fd, new->info.state_fd); | |
528 | ||
529 | sysfs_free(mdi); | |
530 | ||
531 | /* if everything checks out tell the metadata handler we want to | |
532 | * manage this instance | |
533 | */ | |
534 | if (!aa_ready(new) || container->ss->open_new(container, new, inst) < 0) { | |
535 | fprintf(stderr, "mdmon: failed to monitor %s\n", | |
536 | mdstat->metadata_version); | |
537 | new->container = NULL; | |
538 | free_aa(new); | |
539 | } else { | |
540 | replace_array(container, victim, new); | |
541 | if (failed) { | |
542 | new->check_degraded = 1; | |
543 | manage_member(mdstat, new); | |
544 | } | |
545 | } | |
546 | } | |
547 | ||
548 | void manage(struct mdstat_ent *mdstat, struct supertype *container) | |
549 | { | |
550 | /* We have just read mdstat and need to compare it with | |
551 | * the known active arrays. | |
552 | * Arrays with the wrong metadata are ignored. | |
553 | */ | |
554 | ||
555 | for ( ; mdstat ; mdstat = mdstat->next) { | |
556 | struct active_array *a; | |
557 | if (mdstat->devnum == container->devnum) { | |
558 | manage_container(mdstat, container); | |
559 | continue; | |
560 | } | |
561 | if (!is_container_member(mdstat, container->devname)) | |
562 | /* Not for this array */ | |
563 | continue; | |
564 | /* Looks like a member of this container */ | |
565 | for (a = container->arrays; a; a = a->next) { | |
566 | if (mdstat->devnum == a->devnum) { | |
567 | if (a->container) | |
568 | manage_member(mdstat, a); | |
569 | break; | |
570 | } | |
571 | } | |
572 | if (a == NULL || !a->container) | |
573 | manage_new(mdstat, container, a); | |
574 | } | |
575 | } | |
576 | ||
577 | static void handle_message(struct supertype *container, struct metadata_update *msg) | |
578 | { | |
579 | /* queue this metadata update through to the monitor */ | |
580 | ||
581 | struct metadata_update *mu; | |
582 | ||
583 | if (msg->len <= 0) | |
584 | while (update_queue_pending || update_queue) { | |
585 | check_update_queue(container); | |
586 | usleep(15*1000); | |
587 | } | |
588 | ||
589 | if (msg->len == 0) { /* ping_monitor */ | |
590 | int cnt; | |
591 | ||
592 | cnt = monitor_loop_cnt; | |
593 | if (cnt & 1) | |
594 | cnt += 2; /* wait until next pselect */ | |
595 | else | |
596 | cnt += 3; /* wait for 2 pselects */ | |
597 | wakeup_monitor(); | |
598 | ||
599 | while (monitor_loop_cnt - cnt < 0) | |
600 | usleep(10 * 1000); | |
601 | } else if (msg->len == -1) { /* ping_manager */ | |
602 | struct mdstat_ent *mdstat = mdstat_read(1, 0); | |
603 | ||
604 | manage(mdstat, container); | |
605 | free_mdstat(mdstat); | |
606 | } else if (!sigterm) { | |
607 | mu = malloc(sizeof(*mu)); | |
608 | mu->len = msg->len; | |
609 | mu->buf = msg->buf; | |
610 | msg->buf = NULL; | |
611 | mu->space = NULL; | |
612 | mu->next = NULL; | |
613 | if (container->ss->prepare_update) | |
614 | container->ss->prepare_update(container, mu); | |
615 | queue_metadata_update(mu); | |
616 | } | |
617 | } | |
618 | ||
619 | void read_sock(struct supertype *container) | |
620 | { | |
621 | int fd; | |
622 | struct metadata_update msg; | |
623 | int terminate = 0; | |
624 | long fl; | |
625 | int tmo = 3; /* 3 second timeout before hanging up the socket */ | |
626 | ||
627 | fd = accept(container->sock, NULL, NULL); | |
628 | if (fd < 0) | |
629 | return; | |
630 | ||
631 | fl = fcntl(fd, F_GETFL, 0); | |
632 | fl |= O_NONBLOCK; | |
633 | fcntl(fd, F_SETFL, fl); | |
634 | ||
635 | do { | |
636 | msg.buf = NULL; | |
637 | ||
638 | /* read and validate the message */ | |
639 | if (receive_message(fd, &msg, tmo) == 0) { | |
640 | handle_message(container, &msg); | |
641 | if (ack(fd, tmo) < 0) | |
642 | terminate = 1; | |
643 | } else | |
644 | terminate = 1; | |
645 | ||
646 | } while (!terminate); | |
647 | ||
648 | close(fd); | |
649 | } | |
650 | ||
651 | int exit_now = 0; | |
652 | int manager_ready = 0; | |
653 | void do_manager(struct supertype *container) | |
654 | { | |
655 | struct mdstat_ent *mdstat; | |
656 | sigset_t set; | |
657 | int proc_fd; | |
658 | ||
659 | sigprocmask(SIG_UNBLOCK, NULL, &set); | |
660 | sigdelset(&set, SIGUSR1); | |
661 | sigdelset(&set, SIGHUP); | |
662 | sigdelset(&set, SIGALRM); | |
663 | sigdelset(&set, SIGTERM); | |
664 | proc_fd = open("/proc/mounts", O_RDONLY); | |
665 | ||
666 | do { | |
667 | ||
668 | if (exit_now) | |
669 | exit(0); | |
670 | ||
671 | /* Can only 'manage' things if 'monitor' is not making | |
672 | * structural changes to metadata, so need to check | |
673 | * update_queue | |
674 | */ | |
675 | if (update_queue == NULL) { | |
676 | mdstat = mdstat_read(1, 0); | |
677 | ||
678 | manage(mdstat, container); | |
679 | ||
680 | read_sock(container); | |
681 | ||
682 | if (container->sock < 0 || socket_hup_requested) { | |
683 | close(container->sock); | |
684 | container->sock = make_control_sock(container->devname); | |
685 | make_pidfile(container->devname, 0); | |
686 | socket_hup_requested = 0; | |
687 | } | |
688 | if (container->sock < 0) | |
689 | alarm(30); | |
690 | ||
691 | free_mdstat(mdstat); | |
692 | } | |
693 | remove_old(); | |
694 | ||
695 | check_update_queue(container); | |
696 | ||
697 | manager_ready = 1; | |
698 | ||
699 | if (sigterm) | |
700 | wakeup_monitor(); | |
701 | ||
702 | if (update_queue == NULL) { | |
703 | if (container->sock < 0) | |
704 | mdstat_wait_fd(proc_fd, &set); | |
705 | else | |
706 | mdstat_wait_fd(container->sock, &set); | |
707 | } else | |
708 | /* If an update is happening, just wait for signal */ | |
709 | pselect(0, NULL, NULL, NULL, NULL, &set); | |
710 | } while(1); | |
711 | } |