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a54d5262 DW |
1 | /* |
2 | * mdmon - monitor external metadata arrays | |
3 | * | |
4 | * Copyright (C) 2007-2008 Neil Brown <neilb@suse.de> | |
5 | * Copyright (C) 2007-2008 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 | */ | |
549e9569 NB |
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 | * | |
6c3fb95c NB |
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.... | |
549e9569 NB |
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" | |
4d43913c | 107 | #include <sys/syscall.h> |
549e9569 | 108 | #include <sys/socket.h> |
1ed3f387 | 109 | #include <signal.h> |
549e9569 | 110 | |
2a0bb19e DW |
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); | |
2a0bb19e DW |
121 | } |
122 | ||
549e9569 NB |
123 | static void free_aa(struct active_array *aa) |
124 | { | |
2a0bb19e DW |
125 | /* Note that this doesn't close fds if they are being used |
126 | * by a clone. ->container will be set for a clone | |
549e9569 | 127 | */ |
4e6e574a | 128 | dprintf("%s: devnum: %d\n", __func__, aa->devnum); |
2a0bb19e DW |
129 | if (!aa->container) |
130 | close_aa(aa); | |
549e9569 NB |
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 | ||
6c3fb95c NB |
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 | } | |
7e1432fb | 161 | *dp2 = NULL; |
6c3fb95c NB |
162 | |
163 | return newa; | |
164 | } | |
165 | ||
4d43913c | 166 | static void wakeup_monitor(void) |
2a0bb19e | 167 | { |
4d43913c NB |
168 | /* tgkill(getpid(), mon_tid, SIGUSR1); */ |
169 | int pid = getpid(); | |
170 | syscall(SYS_tgkill, pid, mon_tid, SIGUSR1); | |
2a0bb19e DW |
171 | } |
172 | ||
1ed3f387 NB |
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; | |
48561b01 | 181 | wakeup_monitor(); |
1ed3f387 NB |
182 | } |
183 | } | |
184 | ||
549e9569 NB |
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 | */ | |
1ed3f387 | 195 | remove_old(); |
549e9569 NB |
196 | while (pending_discard) { |
197 | while (discard_this == NULL) | |
198 | sleep(1); | |
1ed3f387 | 199 | remove_old(); |
549e9569 NB |
200 | } |
201 | pending_discard = old; | |
202 | new->replaces = old; | |
203 | new->next = container->arrays; | |
204 | container->arrays = new; | |
4d43913c | 205 | wakeup_monitor(); |
549e9569 NB |
206 | } |
207 | ||
2e735d19 NB |
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; | |
904c1ef7 NB |
217 | free(this->buf); |
218 | if (this->space) | |
219 | free(this->space); | |
2e735d19 NB |
220 | free(this); |
221 | } | |
222 | if (update_queue == NULL && | |
223 | update_queue_pending) { | |
224 | update_queue = update_queue_pending; | |
225 | update_queue_pending = NULL; | |
4d43913c | 226 | wakeup_monitor(); |
2e735d19 NB |
227 | } |
228 | } | |
229 | ||
6c3fb95c | 230 | static void queue_metadata_update(struct metadata_update *mu) |
2e735d19 NB |
231 | { |
232 | struct metadata_update **qp; | |
233 | ||
234 | qp = &update_queue_pending; | |
235 | while (*qp) | |
236 | qp = & ((*qp)->next); | |
237 | *qp = mu; | |
238 | } | |
239 | ||
43dad3d6 DW |
240 | static void add_disk_to_container(struct supertype *st, struct mdinfo *sd) |
241 | { | |
242 | int dfd; | |
243 | char nm[20]; | |
244 | struct metadata_update *update = NULL; | |
245 | mdu_disk_info_t dk = { | |
246 | .number = -1, | |
247 | .major = sd->disk.major, | |
248 | .minor = sd->disk.minor, | |
249 | .raid_disk = -1, | |
250 | .state = 0, | |
251 | }; | |
252 | ||
253 | dprintf("%s: add %d:%d to container\n", | |
254 | __func__, sd->disk.major, sd->disk.minor); | |
255 | ||
04a8ac08 DW |
256 | sd->next = st->devs; |
257 | st->devs = sd; | |
258 | ||
43dad3d6 DW |
259 | sprintf(nm, "%d:%d", sd->disk.major, sd->disk.minor); |
260 | dfd = dev_open(nm, O_RDWR); | |
261 | if (dfd < 0) | |
262 | return; | |
263 | ||
264 | st->update_tail = &update; | |
265 | st->ss->add_to_super(st, &dk, dfd, NULL); | |
266 | st->ss->write_init_super(st); | |
267 | queue_metadata_update(update); | |
268 | st->update_tail = NULL; | |
269 | } | |
270 | ||
549e9569 NB |
271 | static void manage_container(struct mdstat_ent *mdstat, |
272 | struct supertype *container) | |
273 | { | |
274 | /* The only thing of interest here is if a new device | |
275 | * has been added to the container. We add it to the | |
276 | * array ignoring any metadata on it. | |
277 | * FIXME should we look for compatible metadata and take hints | |
278 | * about spare assignment.... probably not. | |
549e9569 NB |
279 | */ |
280 | if (mdstat->devcnt != container->devcnt) { | |
7bc1962f DW |
281 | struct mdinfo **cdp, *cd, *di, *mdi; |
282 | int found; | |
283 | ||
549e9569 NB |
284 | /* read /sys/block/NAME/md/dev-??/block/dev to find out |
285 | * what is there, and compare with container->info.devs | |
286 | * To see what is removed and what is added. | |
287 | * These need to be remove from, or added to, the array | |
288 | */ | |
7da80e6f | 289 | mdi = sysfs_read(-1, mdstat->devnum, GET_DEVS|SKIP_GONE_DEVS); |
313a4a82 DW |
290 | if (!mdi) { |
291 | /* invalidate the current count so we can try again */ | |
292 | container->devcnt = -1; | |
7bc1962f | 293 | return; |
313a4a82 | 294 | } |
7bc1962f DW |
295 | |
296 | /* check for removals */ | |
297 | for (cdp = &container->devs; *cdp; ) { | |
298 | found = 0; | |
299 | for (di = mdi->devs; di; di = di->next) | |
300 | if (di->disk.major == (*cdp)->disk.major && | |
301 | di->disk.minor == (*cdp)->disk.minor) { | |
302 | found = 1; | |
303 | break; | |
304 | } | |
305 | if (!found) { | |
306 | cd = *cdp; | |
307 | *cdp = (*cdp)->next; | |
308 | free(cd); | |
309 | } else | |
310 | cdp = &(*cdp)->next; | |
311 | } | |
43dad3d6 DW |
312 | |
313 | /* check for additions */ | |
314 | for (di = mdi->devs; di; di = di->next) { | |
315 | for (cd = container->devs; cd; cd = cd->next) | |
316 | if (di->disk.major == cd->disk.major && | |
317 | di->disk.minor == cd->disk.minor) | |
318 | break; | |
04a8ac08 DW |
319 | if (!cd) { |
320 | struct mdinfo *newd = malloc(sizeof(*newd)); | |
321 | ||
322 | if (!newd) { | |
323 | container->devcnt = -1; | |
324 | continue; | |
325 | } | |
326 | *newd = *di; | |
327 | add_disk_to_container(container, newd); | |
328 | } | |
43dad3d6 | 329 | } |
7bc1962f | 330 | sysfs_free(mdi); |
549e9569 NB |
331 | container->devcnt = mdstat->devcnt; |
332 | } | |
333 | } | |
334 | ||
335 | static void manage_member(struct mdstat_ent *mdstat, | |
336 | struct active_array *a) | |
337 | { | |
338 | /* Compare mdstat info with known state of member array. | |
339 | * We do not need to look for device state changes here, that | |
340 | * is dealt with by the monitor. | |
341 | * | |
342 | * We just look for changes which suggest that a reshape is | |
343 | * being requested. | |
344 | * Unfortunately decreases in raid_disks don't show up in | |
345 | * mdstat until the reshape completes FIXME. | |
6c3fb95c NB |
346 | * |
347 | * Actually, we also want to handle degraded arrays here by | |
348 | * trying to find and assign a spare. | |
349 | * We do that whenever the monitor tells us too. | |
549e9569 NB |
350 | */ |
351 | // FIXME | |
352 | a->info.array.raid_disks = mdstat->raid_disks; | |
353 | a->info.array.chunk_size = mdstat->chunk_size; | |
354 | // MORE | |
355 | ||
6c3fb95c NB |
356 | if (a->check_degraded) { |
357 | struct metadata_update *updates = NULL; | |
358 | struct mdinfo *newdev; | |
359 | struct active_array *newa; | |
3c00ffbe | 360 | |
6c3fb95c NB |
361 | a->check_degraded = 0; |
362 | ||
363 | /* The array may not be degraded, this is just a good time | |
364 | * to check. | |
365 | */ | |
366 | newdev = a->container->ss->activate_spare(a, &updates); | |
367 | if (newdev) { | |
368 | struct mdinfo *d; | |
369 | /* Cool, we can add a device or several. */ | |
370 | newa = duplicate_aa(a); | |
371 | /* suspend recovery - maybe not needed */ | |
372 | ||
373 | /* Add device to array and set offset/size/slot. | |
374 | * and open files for each newdev */ | |
375 | for (d = newdev; d ; d = d->next) { | |
376 | struct mdinfo *newd; | |
00451d98 | 377 | if (sysfs_add_disk(&newa->info, d) < 0) |
6c3fb95c | 378 | continue; |
7801ac20 N |
379 | newd = malloc(sizeof(*newd)); |
380 | *newd = *d; | |
381 | newd->next = newa->info.devs; | |
382 | newa->info.devs = newd; | |
383 | ||
6c3fb95c NB |
384 | newd->state_fd = sysfs_open(a->devnum, |
385 | newd->sys_name, | |
386 | "state"); | |
387 | newd->prev_state | |
388 | = read_dev_state(newd->state_fd); | |
389 | newd->curr_state = newd->prev_state; | |
390 | } | |
391 | queue_metadata_update(updates); | |
392 | replace_array(a->container, a, newa); | |
63d7cc78 | 393 | sysfs_set_str(&a->info, NULL, "sync_action", "recover"); |
6c3fb95c NB |
394 | } |
395 | } | |
549e9569 NB |
396 | } |
397 | ||
836759d5 DW |
398 | static int aa_ready(struct active_array *aa) |
399 | { | |
400 | struct mdinfo *d; | |
401 | int level = aa->info.array.level; | |
402 | ||
403 | for (d = aa->info.devs; d; d = d->next) | |
404 | if (d->state_fd < 0) | |
405 | return 0; | |
406 | ||
407 | if (aa->info.state_fd < 0) | |
408 | return 0; | |
409 | ||
410 | if (level > 0 && (aa->action_fd < 0 || aa->resync_start_fd < 0)) | |
411 | return 0; | |
412 | ||
413 | if (!aa->container) | |
414 | return 0; | |
415 | ||
416 | return 1; | |
417 | } | |
418 | ||
549e9569 | 419 | static void manage_new(struct mdstat_ent *mdstat, |
2a0bb19e DW |
420 | struct supertype *container, |
421 | struct active_array *victim) | |
549e9569 NB |
422 | { |
423 | /* A new array has appeared in this container. | |
424 | * Hopefully it is already recorded in the metadata. | |
425 | * Check, then create the new array to report it to | |
426 | * the monitor. | |
427 | */ | |
428 | ||
429 | struct active_array *new; | |
430 | struct mdinfo *mdi, *di; | |
cba0191b | 431 | char *inst; |
549e9569 | 432 | int i; |
f1d26766 | 433 | int failed = 0; |
549e9569 | 434 | |
836759d5 DW |
435 | /* check if array is ready to be monitored */ |
436 | if (!mdstat->active) | |
437 | return; | |
438 | ||
439 | mdi = sysfs_read(-1, mdstat->devnum, | |
440 | GET_LEVEL|GET_CHUNK|GET_DISKS|GET_COMPONENT| | |
f1d26766 | 441 | GET_DEGRADED|GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE); |
836759d5 | 442 | |
549e9569 NB |
443 | new = malloc(sizeof(*new)); |
444 | ||
836759d5 DW |
445 | if (!new || !mdi) { |
446 | if (mdi) | |
447 | sysfs_free(mdi); | |
448 | if (new) | |
449 | free(new); | |
450 | return; | |
451 | } | |
d52690ac NB |
452 | memset(new, 0, sizeof(*new)); |
453 | ||
549e9569 | 454 | new->devnum = mdstat->devnum; |
7e1432fb | 455 | strcpy(new->info.sys_name, devnum2devname(new->devnum)); |
549e9569 NB |
456 | |
457 | new->prev_state = new->curr_state = new->next_state = inactive; | |
458 | new->prev_action= new->curr_action= new->next_action= idle; | |
459 | ||
460 | new->container = container; | |
461 | ||
cba0191b | 462 | inst = &mdstat->metadata_version[10+strlen(container->devname)+1]; |
549e9569 | 463 | |
549e9569 | 464 | new->info.array = mdi->array; |
272bcc48 | 465 | new->info.component_size = mdi->component_size; |
549e9569 NB |
466 | |
467 | for (i = 0; i < new->info.array.raid_disks; i++) { | |
468 | struct mdinfo *newd = malloc(sizeof(*newd)); | |
469 | ||
470 | for (di = mdi->devs; di; di = di->next) | |
471 | if (i == di->disk.raid_disk) | |
472 | break; | |
473 | ||
7da80e6f | 474 | if (di && newd) { |
549e9569 NB |
475 | memcpy(newd, di, sizeof(*newd)); |
476 | ||
549e9569 NB |
477 | newd->state_fd = sysfs_open(new->devnum, |
478 | newd->sys_name, | |
479 | "state"); | |
480 | ||
481 | newd->prev_state = read_dev_state(newd->state_fd); | |
6c3fb95c | 482 | newd->curr_state = newd->prev_state; |
f1d26766 | 483 | } else { |
7da80e6f DW |
484 | if (newd) |
485 | free(newd); | |
486 | ||
f1d26766 | 487 | failed++; |
7da80e6f DW |
488 | if (failed > new->info.array.failed_disks) { |
489 | /* we cannot properly monitor without all working disks */ | |
490 | new->container = NULL; | |
491 | break; | |
492 | } | |
f1d26766 | 493 | continue; |
549e9569 | 494 | } |
7e1432fb | 495 | sprintf(newd->sys_name, "rd%d", i); |
549e9569 NB |
496 | newd->next = new->info.devs; |
497 | new->info.devs = newd; | |
498 | } | |
836759d5 | 499 | |
549e9569 NB |
500 | new->action_fd = sysfs_open(new->devnum, NULL, "sync_action"); |
501 | new->info.state_fd = sysfs_open(new->devnum, NULL, "array_state"); | |
c052ba30 | 502 | new->resync_start_fd = sysfs_open(new->devnum, NULL, "resync_start"); |
e9dd1598 | 503 | new->metadata_fd = sysfs_open(new->devnum, NULL, "metadata_version"); |
103f2410 | 504 | get_resync_start(new); |
4e6e574a DW |
505 | dprintf("%s: inst: %d action: %d state: %d\n", __func__, atoi(inst), |
506 | new->action_fd, new->info.state_fd); | |
549e9569 | 507 | |
4fa5aef9 | 508 | sysfs_free(mdi); |
836759d5 DW |
509 | |
510 | /* if everything checks out tell the metadata handler we want to | |
511 | * manage this instance | |
512 | */ | |
513 | if (!aa_ready(new) || container->ss->open_new(container, new, inst) < 0) { | |
514 | fprintf(stderr, "mdmon: failed to monitor %s\n", | |
515 | mdstat->metadata_version); | |
549e9569 | 516 | new->container = NULL; |
836759d5 | 517 | free_aa(new); |
93f7caca | 518 | } else { |
2a0bb19e | 519 | replace_array(container, victim, new); |
93f7caca DW |
520 | if (failed) { |
521 | new->check_degraded = 1; | |
522 | manage_member(mdstat, new); | |
523 | } | |
524 | } | |
549e9569 NB |
525 | } |
526 | ||
5d19760d | 527 | void manage(struct mdstat_ent *mdstat, struct supertype *container) |
549e9569 NB |
528 | { |
529 | /* We have just read mdstat and need to compare it with | |
530 | * the known active arrays. | |
531 | * Arrays with the wrong metadata are ignored. | |
532 | */ | |
533 | ||
534 | for ( ; mdstat ; mdstat = mdstat->next) { | |
535 | struct active_array *a; | |
536 | if (mdstat->devnum == container->devnum) { | |
537 | manage_container(mdstat, container); | |
538 | continue; | |
539 | } | |
883a6142 | 540 | if (!is_container_member(mdstat, container->devname)) |
549e9569 NB |
541 | /* Not for this array */ |
542 | continue; | |
543 | /* Looks like a member of this container */ | |
5d19760d | 544 | for (a = container->arrays; a; a = a->next) { |
549e9569 NB |
545 | if (mdstat->devnum == a->devnum) { |
546 | if (a->container) | |
547 | manage_member(mdstat, a); | |
548 | break; | |
549 | } | |
550 | } | |
2a0bb19e DW |
551 | if (a == NULL || !a->container) |
552 | manage_new(mdstat, container, a); | |
549e9569 NB |
553 | } |
554 | } | |
555 | ||
edd8d13c | 556 | static void handle_message(struct supertype *container, struct metadata_update *msg) |
3e70c845 | 557 | { |
edd8d13c NB |
558 | /* queue this metadata update through to the monitor */ |
559 | ||
560 | struct metadata_update *mu; | |
561 | ||
313a4a82 | 562 | if (msg->len <= 0) |
3c00ffbe N |
563 | while (update_queue_pending || update_queue) { |
564 | check_update_queue(container); | |
565 | usleep(15*1000); | |
566 | } | |
567 | ||
313a4a82 DW |
568 | if (msg->len == 0) { /* ping_monitor */ |
569 | int cnt; | |
570 | ||
3c00ffbe | 571 | cnt = monitor_loop_cnt; |
1eb252b8 N |
572 | if (cnt & 1) |
573 | cnt += 2; /* wait until next pselect */ | |
574 | else | |
575 | cnt += 3; /* wait for 2 pselects */ | |
576 | wakeup_monitor(); | |
3c00ffbe | 577 | |
1eb252b8 N |
578 | while (monitor_loop_cnt - cnt < 0) |
579 | usleep(10 * 1000); | |
313a4a82 DW |
580 | } else if (msg->len == -1) { /* ping_manager */ |
581 | struct mdstat_ent *mdstat = mdstat_read(1, 0); | |
582 | ||
583 | manage(mdstat, container); | |
584 | free_mdstat(mdstat); | |
6144ed44 | 585 | } else if (!sigterm) { |
edd8d13c NB |
586 | mu = malloc(sizeof(*mu)); |
587 | mu->len = msg->len; | |
588 | mu->buf = msg->buf; | |
589 | msg->buf = NULL; | |
590 | mu->space = NULL; | |
591 | mu->next = NULL; | |
592 | if (container->ss->prepare_update) | |
593 | container->ss->prepare_update(container, mu); | |
594 | queue_metadata_update(mu); | |
595 | } | |
3e70c845 DW |
596 | } |
597 | ||
598 | void read_sock(struct supertype *container) | |
549e9569 NB |
599 | { |
600 | int fd; | |
bfa44e2e | 601 | struct metadata_update msg; |
b109d928 DW |
602 | int terminate = 0; |
603 | long fl; | |
604 | int tmo = 3; /* 3 second timeout before hanging up the socket */ | |
549e9569 | 605 | |
3e70c845 | 606 | fd = accept(container->sock, NULL, NULL); |
549e9569 NB |
607 | if (fd < 0) |
608 | return; | |
b109d928 DW |
609 | |
610 | fl = fcntl(fd, F_GETFL, 0); | |
611 | fl |= O_NONBLOCK; | |
612 | fcntl(fd, F_SETFL, fl); | |
613 | ||
614 | do { | |
615 | msg.buf = NULL; | |
616 | ||
617 | /* read and validate the message */ | |
618 | if (receive_message(fd, &msg, tmo) == 0) { | |
bfa44e2e NB |
619 | handle_message(container, &msg); |
620 | if (ack(fd, tmo) < 0) | |
621 | terminate = 1; | |
622 | } else | |
b109d928 | 623 | terminate = 1; |
b109d928 | 624 | |
b109d928 DW |
625 | } while (!terminate); |
626 | ||
549e9569 NB |
627 | close(fd); |
628 | } | |
1ed3f387 | 629 | |
e0d6609f NB |
630 | int exit_now = 0; |
631 | int manager_ready = 0; | |
549e9569 NB |
632 | void do_manager(struct supertype *container) |
633 | { | |
634 | struct mdstat_ent *mdstat; | |
4d43913c | 635 | sigset_t set; |
695154b2 | 636 | int proc_fd; |
1ed3f387 | 637 | |
4d43913c NB |
638 | sigprocmask(SIG_UNBLOCK, NULL, &set); |
639 | sigdelset(&set, SIGUSR1); | |
295646b3 | 640 | sigdelset(&set, SIGHUP); |
695154b2 | 641 | sigdelset(&set, SIGALRM); |
6144ed44 | 642 | sigdelset(&set, SIGTERM); |
695154b2 | 643 | proc_fd = open("/proc/mounts", O_RDONLY); |
549e9569 NB |
644 | |
645 | do { | |
1ed3f387 | 646 | |
e0d6609f NB |
647 | if (exit_now) |
648 | exit(0); | |
649 | ||
3c00ffbe N |
650 | /* Can only 'manage' things if 'monitor' is not making |
651 | * structural changes to metadata, so need to check | |
652 | * update_queue | |
653 | */ | |
654 | if (update_queue == NULL) { | |
655 | mdstat = mdstat_read(1, 0); | |
549e9569 | 656 | |
3c00ffbe | 657 | manage(mdstat, container); |
549e9569 | 658 | |
3c00ffbe | 659 | read_sock(container); |
4fa5aef9 | 660 | |
695154b2 | 661 | if (container->sock < 0 || socket_hup_requested) { |
295646b3 DW |
662 | close(container->sock); |
663 | container->sock = make_control_sock(container->devname); | |
664 | make_pidfile(container->devname, 0); | |
665 | socket_hup_requested = 0; | |
666 | } | |
695154b2 DW |
667 | if (container->sock < 0) |
668 | alarm(30); | |
295646b3 | 669 | |
3c00ffbe N |
670 | free_mdstat(mdstat); |
671 | } | |
1ed3f387 NB |
672 | remove_old(); |
673 | ||
2e735d19 NB |
674 | check_update_queue(container); |
675 | ||
e0d6609f | 676 | manager_ready = 1; |
4d43913c | 677 | |
6144ed44 DW |
678 | if (sigterm) |
679 | wakeup_monitor(); | |
680 | ||
695154b2 DW |
681 | if (update_queue == NULL) { |
682 | if (container->sock < 0) | |
683 | mdstat_wait_fd(proc_fd, &set); | |
684 | else | |
685 | mdstat_wait_fd(container->sock, &set); | |
686 | } else | |
3c00ffbe N |
687 | /* If an update is happening, just wait for signal */ |
688 | pselect(0, NULL, NULL, NULL, NULL, &set); | |
549e9569 NB |
689 | } while(1); |
690 | } |