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Commit | Line | Data |
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a54d5262 DW |
1 | /* |
2 | * mdmon - monitor external metadata arrays | |
3 | * | |
e736b623 N |
4 | * Copyright (C) 2007-2009 Neil Brown <neilb@suse.de> |
5 | * Copyright (C) 2007-2009 Intel Corporation | |
a54d5262 DW |
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 | ||
e1516be1 DW |
115 | for (d = aa->info.devs; d; d = d->next) { |
116 | close(d->recovery_fd); | |
2a0bb19e | 117 | close(d->state_fd); |
e1516be1 | 118 | } |
2a0bb19e DW |
119 | |
120 | close(aa->action_fd); | |
121 | close(aa->info.state_fd); | |
122 | close(aa->resync_start_fd); | |
a9d868c3 AK |
123 | close(aa->metadata_fd); |
124 | close(aa->sync_completed_fd); | |
2a0bb19e DW |
125 | } |
126 | ||
549e9569 NB |
127 | static void free_aa(struct active_array *aa) |
128 | { | |
2a0bb19e DW |
129 | /* Note that this doesn't close fds if they are being used |
130 | * by a clone. ->container will be set for a clone | |
549e9569 | 131 | */ |
4e6e574a | 132 | dprintf("%s: devnum: %d\n", __func__, aa->devnum); |
2a0bb19e DW |
133 | if (!aa->container) |
134 | close_aa(aa); | |
549e9569 NB |
135 | while (aa->info.devs) { |
136 | struct mdinfo *d = aa->info.devs; | |
137 | aa->info.devs = d->next; | |
138 | free(d); | |
139 | } | |
140 | free(aa); | |
141 | } | |
142 | ||
6c3fb95c NB |
143 | static struct active_array *duplicate_aa(struct active_array *aa) |
144 | { | |
145 | struct active_array *newa = malloc(sizeof(*newa)); | |
146 | struct mdinfo **dp1, **dp2; | |
147 | ||
148 | *newa = *aa; | |
149 | newa->next = NULL; | |
150 | newa->replaces = NULL; | |
151 | newa->info.next = NULL; | |
152 | ||
153 | dp2 = &newa->info.devs; | |
154 | ||
155 | for (dp1 = &aa->info.devs; *dp1; dp1 = &(*dp1)->next) { | |
156 | struct mdinfo *d; | |
157 | if ((*dp1)->state_fd < 0) | |
158 | continue; | |
159 | ||
160 | d = malloc(sizeof(*d)); | |
161 | *d = **dp1; | |
162 | *dp2 = d; | |
163 | dp2 = & d->next; | |
164 | } | |
7e1432fb | 165 | *dp2 = NULL; |
6c3fb95c NB |
166 | |
167 | return newa; | |
168 | } | |
169 | ||
4d43913c | 170 | static void wakeup_monitor(void) |
2a0bb19e | 171 | { |
4d43913c NB |
172 | /* tgkill(getpid(), mon_tid, SIGUSR1); */ |
173 | int pid = getpid(); | |
174 | syscall(SYS_tgkill, pid, mon_tid, SIGUSR1); | |
2a0bb19e DW |
175 | } |
176 | ||
1ed3f387 NB |
177 | static void remove_old(void) |
178 | { | |
179 | if (discard_this) { | |
180 | discard_this->next = NULL; | |
181 | free_aa(discard_this); | |
182 | if (pending_discard == discard_this) | |
183 | pending_discard = NULL; | |
184 | discard_this = NULL; | |
48561b01 | 185 | wakeup_monitor(); |
1ed3f387 NB |
186 | } |
187 | } | |
188 | ||
549e9569 NB |
189 | static void replace_array(struct supertype *container, |
190 | struct active_array *old, | |
191 | struct active_array *new) | |
192 | { | |
193 | /* To replace an array, we add it to the top of the list | |
194 | * marked with ->replaces to point to the original. | |
195 | * 'monitor' will take the original out of the list | |
196 | * and put it on 'discard_this'. We take it from there | |
197 | * and discard it. | |
198 | */ | |
1ed3f387 | 199 | remove_old(); |
549e9569 NB |
200 | while (pending_discard) { |
201 | while (discard_this == NULL) | |
202 | sleep(1); | |
1ed3f387 | 203 | remove_old(); |
549e9569 NB |
204 | } |
205 | pending_discard = old; | |
206 | new->replaces = old; | |
207 | new->next = container->arrays; | |
208 | container->arrays = new; | |
4d43913c | 209 | wakeup_monitor(); |
549e9569 NB |
210 | } |
211 | ||
2e735d19 NB |
212 | struct metadata_update *update_queue = NULL; |
213 | struct metadata_update *update_queue_handled = NULL; | |
214 | struct metadata_update *update_queue_pending = NULL; | |
215 | ||
071cfc42 | 216 | static void free_updates(struct metadata_update **update) |
2e735d19 | 217 | { |
071cfc42 DW |
218 | while (*update) { |
219 | struct metadata_update *this = *update; | |
cb23f1f4 | 220 | void **space_list = this->space_list; |
071cfc42 DW |
221 | |
222 | *update = this->next; | |
904c1ef7 | 223 | free(this->buf); |
071cfc42 | 224 | free(this->space); |
cb23f1f4 N |
225 | while (space_list) { |
226 | void *space = space_list; | |
227 | space_list = *space_list; | |
228 | free(space); | |
229 | } | |
2e735d19 NB |
230 | free(this); |
231 | } | |
071cfc42 DW |
232 | } |
233 | ||
234 | void check_update_queue(struct supertype *container) | |
235 | { | |
236 | free_updates(&update_queue_handled); | |
237 | ||
2e735d19 NB |
238 | if (update_queue == NULL && |
239 | update_queue_pending) { | |
240 | update_queue = update_queue_pending; | |
241 | update_queue_pending = NULL; | |
4d43913c | 242 | wakeup_monitor(); |
2e735d19 NB |
243 | } |
244 | } | |
245 | ||
6c3fb95c | 246 | static void queue_metadata_update(struct metadata_update *mu) |
2e735d19 NB |
247 | { |
248 | struct metadata_update **qp; | |
249 | ||
250 | qp = &update_queue_pending; | |
251 | while (*qp) | |
252 | qp = & ((*qp)->next); | |
253 | *qp = mu; | |
254 | } | |
255 | ||
43dad3d6 DW |
256 | static void add_disk_to_container(struct supertype *st, struct mdinfo *sd) |
257 | { | |
258 | int dfd; | |
259 | char nm[20]; | |
661dce36 | 260 | struct supertype *st2; |
43dad3d6 | 261 | struct metadata_update *update = NULL; |
661dce36 | 262 | struct mdinfo info; |
43dad3d6 DW |
263 | mdu_disk_info_t dk = { |
264 | .number = -1, | |
265 | .major = sd->disk.major, | |
266 | .minor = sd->disk.minor, | |
267 | .raid_disk = -1, | |
268 | .state = 0, | |
269 | }; | |
270 | ||
271 | dprintf("%s: add %d:%d to container\n", | |
272 | __func__, sd->disk.major, sd->disk.minor); | |
273 | ||
04a8ac08 DW |
274 | sd->next = st->devs; |
275 | st->devs = sd; | |
276 | ||
43dad3d6 DW |
277 | sprintf(nm, "%d:%d", sd->disk.major, sd->disk.minor); |
278 | dfd = dev_open(nm, O_RDWR); | |
279 | if (dfd < 0) | |
280 | return; | |
281 | ||
661dce36 N |
282 | /* Check the metadata and see if it is already part of this |
283 | * array | |
284 | */ | |
285 | st2 = dup_super(st); | |
286 | if (st2->ss->load_super(st2, dfd, NULL) == 0) { | |
a5d85af7 | 287 | st2->ss->getinfo_super(st, &info, NULL); |
661dce36 N |
288 | if (st->ss->compare_super(st, st2) == 0 && |
289 | info.disk.raid_disk >= 0) { | |
290 | /* Looks like a good member of array. | |
291 | * Just accept it. | |
292 | * mdadm will incorporate any parts into | |
293 | * active arrays. | |
294 | */ | |
295 | st2->ss->free_super(st2); | |
296 | return; | |
297 | } | |
298 | } | |
299 | st2->ss->free_super(st2); | |
300 | ||
43dad3d6 DW |
301 | st->update_tail = &update; |
302 | st->ss->add_to_super(st, &dk, dfd, NULL); | |
303 | st->ss->write_init_super(st); | |
304 | queue_metadata_update(update); | |
305 | st->update_tail = NULL; | |
306 | } | |
307 | ||
1a64be56 LM |
308 | /* |
309 | * Create and queue update structure about the removed disks. | |
310 | * The update is prepared by super type handler and passed to the monitor | |
311 | * thread. | |
312 | */ | |
313 | static void remove_disk_from_container(struct supertype *st, struct mdinfo *sd) | |
314 | { | |
315 | struct metadata_update *update = NULL; | |
316 | mdu_disk_info_t dk = { | |
317 | .number = -1, | |
318 | .major = sd->disk.major, | |
319 | .minor = sd->disk.minor, | |
320 | .raid_disk = -1, | |
321 | .state = 0, | |
322 | }; | |
1a64be56 LM |
323 | dprintf("%s: remove %d:%d from container\n", |
324 | __func__, sd->disk.major, sd->disk.minor); | |
325 | ||
326 | st->update_tail = &update; | |
327 | st->ss->remove_from_super(st, &dk); | |
4dd968cc N |
328 | /* FIXME this write_init_super shouldn't be here. |
329 | * We have it after add_to_super to write to new device, | |
330 | * but with 'remove' we don't ant to write to that device! | |
331 | */ | |
1a64be56 LM |
332 | st->ss->write_init_super(st); |
333 | queue_metadata_update(update); | |
334 | st->update_tail = NULL; | |
335 | } | |
336 | ||
549e9569 NB |
337 | static void manage_container(struct mdstat_ent *mdstat, |
338 | struct supertype *container) | |
339 | { | |
1a64be56 LM |
340 | /* Of interest here are: |
341 | * - if a new device has been added to the container, we | |
342 | * add it to the array ignoring any metadata on it. | |
343 | * - if a device has been removed from the container, we | |
344 | * remove it from the device list and update the metadata. | |
549e9569 NB |
345 | * FIXME should we look for compatible metadata and take hints |
346 | * about spare assignment.... probably not. | |
549e9569 NB |
347 | */ |
348 | if (mdstat->devcnt != container->devcnt) { | |
7bc1962f DW |
349 | struct mdinfo **cdp, *cd, *di, *mdi; |
350 | int found; | |
351 | ||
549e9569 NB |
352 | /* read /sys/block/NAME/md/dev-??/block/dev to find out |
353 | * what is there, and compare with container->info.devs | |
354 | * To see what is removed and what is added. | |
355 | * These need to be remove from, or added to, the array | |
356 | */ | |
b526e52d | 357 | mdi = sysfs_read(-1, mdstat->devnum, GET_DEVS); |
313a4a82 DW |
358 | if (!mdi) { |
359 | /* invalidate the current count so we can try again */ | |
360 | container->devcnt = -1; | |
7bc1962f | 361 | return; |
313a4a82 | 362 | } |
7bc1962f DW |
363 | |
364 | /* check for removals */ | |
365 | for (cdp = &container->devs; *cdp; ) { | |
366 | found = 0; | |
367 | for (di = mdi->devs; di; di = di->next) | |
368 | if (di->disk.major == (*cdp)->disk.major && | |
369 | di->disk.minor == (*cdp)->disk.minor) { | |
370 | found = 1; | |
371 | break; | |
372 | } | |
373 | if (!found) { | |
374 | cd = *cdp; | |
375 | *cdp = (*cdp)->next; | |
1a64be56 | 376 | remove_disk_from_container(container, cd); |
7bc1962f DW |
377 | free(cd); |
378 | } else | |
379 | cdp = &(*cdp)->next; | |
380 | } | |
43dad3d6 DW |
381 | |
382 | /* check for additions */ | |
383 | for (di = mdi->devs; di; di = di->next) { | |
384 | for (cd = container->devs; cd; cd = cd->next) | |
385 | if (di->disk.major == cd->disk.major && | |
386 | di->disk.minor == cd->disk.minor) | |
387 | break; | |
04a8ac08 DW |
388 | if (!cd) { |
389 | struct mdinfo *newd = malloc(sizeof(*newd)); | |
390 | ||
391 | if (!newd) { | |
392 | container->devcnt = -1; | |
393 | continue; | |
394 | } | |
395 | *newd = *di; | |
396 | add_disk_to_container(container, newd); | |
397 | } | |
43dad3d6 | 398 | } |
7bc1962f | 399 | sysfs_free(mdi); |
549e9569 NB |
400 | container->devcnt = mdstat->devcnt; |
401 | } | |
402 | } | |
403 | ||
63b4aae3 DW |
404 | static int disk_init_and_add(struct mdinfo *disk, struct mdinfo *clone, |
405 | struct active_array *aa) | |
406 | { | |
407 | if (!disk || !clone) | |
408 | return -1; | |
409 | ||
410 | *disk = *clone; | |
411 | disk->recovery_fd = sysfs_open(aa->devnum, disk->sys_name, "recovery_start"); | |
412 | disk->state_fd = sysfs_open(aa->devnum, disk->sys_name, "state"); | |
413 | disk->prev_state = read_dev_state(disk->state_fd); | |
414 | disk->curr_state = disk->prev_state; | |
415 | disk->next = aa->info.devs; | |
416 | aa->info.devs = disk; | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
549e9569 NB |
421 | static void manage_member(struct mdstat_ent *mdstat, |
422 | struct active_array *a) | |
423 | { | |
424 | /* Compare mdstat info with known state of member array. | |
425 | * We do not need to look for device state changes here, that | |
426 | * is dealt with by the monitor. | |
427 | * | |
0f99b4bd N |
428 | * If a reshape is being requested, monitor will have noticed |
429 | * that sync_action changed and will have set check_reshape. | |
430 | * We just need to see if new devices have appeared. All metadata | |
431 | * updates will already have been processed. | |
6c3fb95c | 432 | * |
0f99b4bd | 433 | * We also want to handle degraded arrays here by |
6c3fb95c NB |
434 | * trying to find and assign a spare. |
435 | * We do that whenever the monitor tells us too. | |
549e9569 | 436 | */ |
bc77ed53 DW |
437 | char buf[64]; |
438 | int frozen; | |
439 | ||
549e9569 NB |
440 | // FIXME |
441 | a->info.array.raid_disks = mdstat->raid_disks; | |
549e9569 NB |
442 | // MORE |
443 | ||
bc77ed53 DW |
444 | /* honor 'frozen' */ |
445 | if (sysfs_get_str(&a->info, NULL, "metadata_version", buf, sizeof(buf)) > 0) | |
446 | frozen = buf[9] == '-'; | |
447 | else | |
448 | frozen = 1; /* can't read metadata_version assume the worst */ | |
449 | ||
f54a6742 N |
450 | /* If sync_action is not 'idle' then don't try recovery now */ |
451 | if (!frozen | |
452 | && sysfs_get_str(&a->info, NULL, "sync_action", buf, sizeof(buf)) > 0 | |
453 | && strncmp(buf, "idle", 4) != 0) | |
454 | frozen = 1; | |
455 | ||
57f8c769 AK |
456 | if (mdstat->level) { |
457 | int level = map_name(pers, mdstat->level); | |
458 | if (a->info.array.level != level && level >= 0) { | |
459 | struct active_array *newa = duplicate_aa(a); | |
460 | if (newa) { | |
461 | newa->info.array.level = level; | |
462 | replace_array(a->container, a, newa); | |
463 | a = newa; | |
464 | } | |
465 | } | |
466 | } | |
467 | ||
0c4f6e37 | 468 | /* We don't check the array while any update is pending, as it |
88b496c2 | 469 | * might container a change (such as a spare assignment) which |
0c4f6e37 N |
470 | * could affect our decisions. |
471 | */ | |
88b496c2 | 472 | if (a->check_degraded && !frozen && |
0c4f6e37 | 473 | update_queue == NULL && update_queue_pending == NULL) { |
6c3fb95c | 474 | struct metadata_update *updates = NULL; |
071cfc42 | 475 | struct mdinfo *newdev = NULL; |
6c3fb95c | 476 | struct active_array *newa; |
071cfc42 | 477 | struct mdinfo *d; |
3c00ffbe | 478 | |
6c3fb95c NB |
479 | a->check_degraded = 0; |
480 | ||
481 | /* The array may not be degraded, this is just a good time | |
482 | * to check. | |
483 | */ | |
484 | newdev = a->container->ss->activate_spare(a, &updates); | |
071cfc42 DW |
485 | if (!newdev) |
486 | return; | |
487 | ||
488 | newa = duplicate_aa(a); | |
489 | if (!newa) | |
490 | goto out; | |
491 | /* Cool, we can add a device or several. */ | |
492 | ||
493 | /* Add device to array and set offset/size/slot. | |
494 | * and open files for each newdev */ | |
495 | for (d = newdev; d ; d = d->next) { | |
496 | struct mdinfo *newd; | |
497 | ||
498 | newd = malloc(sizeof(*newd)); | |
499 | if (!newd) | |
500 | continue; | |
2904b26f | 501 | if (sysfs_add_disk(&newa->info, d, 0) < 0) { |
071cfc42 DW |
502 | free(newd); |
503 | continue; | |
6c3fb95c | 504 | } |
63b4aae3 | 505 | disk_init_and_add(newd, d, newa); |
071cfc42 DW |
506 | } |
507 | queue_metadata_update(updates); | |
508 | updates = NULL; | |
509 | replace_array(a->container, a, newa); | |
510 | sysfs_set_str(&a->info, NULL, "sync_action", "recover"); | |
511 | out: | |
512 | while (newdev) { | |
513 | d = newdev->next; | |
514 | free(newdev); | |
515 | newdev = d; | |
6c3fb95c | 516 | } |
071cfc42 | 517 | free_updates(&updates); |
6c3fb95c | 518 | } |
0f99b4bd N |
519 | |
520 | if (a->check_reshape) { | |
521 | /* mdadm might have added some devices to the array. | |
522 | * We want to disk_init_and_add any such device to a | |
523 | * duplicate_aa and replace a with that. | |
524 | * mdstat doesn't have enough info so we sysfs_read | |
525 | * and look for new stuff. | |
526 | */ | |
527 | struct mdinfo *info, *d, *d2, *newd; | |
aad6f216 | 528 | unsigned long long array_size; |
0f99b4bd N |
529 | struct active_array *newa = NULL; |
530 | a->check_reshape = 0; | |
531 | info = sysfs_read(-1, mdstat->devnum, | |
532 | GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE); | |
533 | if (!info) | |
534 | goto out2; | |
535 | for (d = info->devs; d; d = d->next) { | |
536 | if (d->disk.raid_disk < 0) | |
537 | continue; | |
538 | for (d2 = a->info.devs; d2; d2 = d2->next) | |
539 | if (d2->disk.raid_disk == | |
540 | d->disk.raid_disk) | |
541 | break; | |
542 | if (d2) | |
543 | /* already have this one */ | |
544 | continue; | |
545 | if (!newa) { | |
546 | newa = duplicate_aa(a); | |
547 | if (!newa) | |
548 | break; | |
549 | } | |
550 | newd = malloc(sizeof(*newd)); | |
551 | if (!newd) | |
552 | continue; | |
553 | disk_init_and_add(newd, d, newa); | |
554 | } | |
aad6f216 | 555 | if (sysfs_get_ll(info, NULL, "array_size", &array_size) == 0 |
02eedb57 | 556 | && a->info.custom_array_size > array_size*2) { |
aad6f216 | 557 | sysfs_set_num(info, NULL, "array_size", |
02eedb57 | 558 | a->info.custom_array_size/2); |
aad6f216 | 559 | } |
0f99b4bd N |
560 | out2: |
561 | sysfs_free(info); | |
562 | if (newa) | |
563 | replace_array(a->container, a, newa); | |
564 | } | |
549e9569 NB |
565 | } |
566 | ||
836759d5 DW |
567 | static int aa_ready(struct active_array *aa) |
568 | { | |
569 | struct mdinfo *d; | |
570 | int level = aa->info.array.level; | |
571 | ||
572 | for (d = aa->info.devs; d; d = d->next) | |
573 | if (d->state_fd < 0) | |
574 | return 0; | |
575 | ||
576 | if (aa->info.state_fd < 0) | |
577 | return 0; | |
578 | ||
579 | if (level > 0 && (aa->action_fd < 0 || aa->resync_start_fd < 0)) | |
580 | return 0; | |
581 | ||
582 | if (!aa->container) | |
583 | return 0; | |
584 | ||
585 | return 1; | |
586 | } | |
587 | ||
549e9569 | 588 | static void manage_new(struct mdstat_ent *mdstat, |
2a0bb19e DW |
589 | struct supertype *container, |
590 | struct active_array *victim) | |
549e9569 NB |
591 | { |
592 | /* A new array has appeared in this container. | |
593 | * Hopefully it is already recorded in the metadata. | |
594 | * Check, then create the new array to report it to | |
595 | * the monitor. | |
596 | */ | |
597 | ||
598 | struct active_array *new; | |
599 | struct mdinfo *mdi, *di; | |
cba0191b | 600 | char *inst; |
549e9569 | 601 | int i; |
f1d26766 | 602 | int failed = 0; |
138477db | 603 | char buf[40]; |
549e9569 | 604 | |
836759d5 DW |
605 | /* check if array is ready to be monitored */ |
606 | if (!mdstat->active) | |
607 | return; | |
608 | ||
609 | mdi = sysfs_read(-1, mdstat->devnum, | |
610 | GET_LEVEL|GET_CHUNK|GET_DISKS|GET_COMPONENT| | |
f1d26766 | 611 | GET_DEGRADED|GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE); |
836759d5 | 612 | |
549e9569 NB |
613 | new = malloc(sizeof(*new)); |
614 | ||
836759d5 DW |
615 | if (!new || !mdi) { |
616 | if (mdi) | |
617 | sysfs_free(mdi); | |
618 | if (new) | |
619 | free(new); | |
620 | return; | |
621 | } | |
d52690ac NB |
622 | memset(new, 0, sizeof(*new)); |
623 | ||
549e9569 | 624 | new->devnum = mdstat->devnum; |
7e1432fb | 625 | strcpy(new->info.sys_name, devnum2devname(new->devnum)); |
549e9569 NB |
626 | |
627 | new->prev_state = new->curr_state = new->next_state = inactive; | |
628 | new->prev_action= new->curr_action= new->next_action= idle; | |
629 | ||
630 | new->container = container; | |
631 | ||
e5408a32 | 632 | inst = to_subarray(mdstat, container->devname); |
549e9569 | 633 | |
549e9569 | 634 | new->info.array = mdi->array; |
272bcc48 | 635 | new->info.component_size = mdi->component_size; |
549e9569 NB |
636 | |
637 | for (i = 0; i < new->info.array.raid_disks; i++) { | |
638 | struct mdinfo *newd = malloc(sizeof(*newd)); | |
639 | ||
640 | for (di = mdi->devs; di; di = di->next) | |
641 | if (i == di->disk.raid_disk) | |
642 | break; | |
643 | ||
63b4aae3 | 644 | if (disk_init_and_add(newd, di, new) != 0) { |
7da80e6f DW |
645 | if (newd) |
646 | free(newd); | |
647 | ||
f1d26766 | 648 | failed++; |
7da80e6f DW |
649 | if (failed > new->info.array.failed_disks) { |
650 | /* we cannot properly monitor without all working disks */ | |
651 | new->container = NULL; | |
652 | break; | |
653 | } | |
549e9569 | 654 | } |
549e9569 | 655 | } |
836759d5 | 656 | |
549e9569 NB |
657 | new->action_fd = sysfs_open(new->devnum, NULL, "sync_action"); |
658 | new->info.state_fd = sysfs_open(new->devnum, NULL, "array_state"); | |
c052ba30 | 659 | new->resync_start_fd = sysfs_open(new->devnum, NULL, "resync_start"); |
e9dd1598 | 660 | new->metadata_fd = sysfs_open(new->devnum, NULL, "metadata_version"); |
484240d8 | 661 | new->sync_completed_fd = sysfs_open(new->devnum, NULL, "sync_completed"); |
4e6e574a DW |
662 | dprintf("%s: inst: %d action: %d state: %d\n", __func__, atoi(inst), |
663 | new->action_fd, new->info.state_fd); | |
549e9569 | 664 | |
138477db AK |
665 | /* reshape_position is set by mdadm in sysfs |
666 | * read this information for new arrays only (empty victim) | |
667 | */ | |
668 | if ((victim == NULL) && | |
669 | (sysfs_get_str(mdi, NULL, "sync_action", buf, 40) > 0) && | |
670 | (strncmp(buf, "reshape", 7) == 0)) { | |
671 | if (sysfs_get_ll(mdi, NULL, "reshape_position", | |
672 | &new->last_checkpoint) != 0) | |
673 | new->last_checkpoint = 0; | |
0d51bfa2 AK |
674 | else { |
675 | int data_disks = mdi->array.raid_disks; | |
676 | if (mdi->array.level == 4 || mdi->array.level == 5) | |
677 | data_disks--; | |
678 | if (mdi->array.level == 6) | |
679 | data_disks -= 2; | |
680 | ||
681 | new->last_checkpoint /= data_disks; | |
682 | } | |
138477db AK |
683 | dprintf("mdmon: New monitored array is under reshape.\n" |
684 | " Last checkpoint is: %llu\n", | |
685 | new->last_checkpoint); | |
686 | } | |
687 | ||
4fa5aef9 | 688 | sysfs_free(mdi); |
836759d5 DW |
689 | |
690 | /* if everything checks out tell the metadata handler we want to | |
691 | * manage this instance | |
692 | */ | |
693 | if (!aa_ready(new) || container->ss->open_new(container, new, inst) < 0) { | |
694 | fprintf(stderr, "mdmon: failed to monitor %s\n", | |
695 | mdstat->metadata_version); | |
549e9569 | 696 | new->container = NULL; |
836759d5 | 697 | free_aa(new); |
93f7caca | 698 | } else { |
2a0bb19e | 699 | replace_array(container, victim, new); |
93f7caca DW |
700 | if (failed) { |
701 | new->check_degraded = 1; | |
702 | manage_member(mdstat, new); | |
703 | } | |
704 | } | |
549e9569 NB |
705 | } |
706 | ||
5d19760d | 707 | void manage(struct mdstat_ent *mdstat, struct supertype *container) |
549e9569 NB |
708 | { |
709 | /* We have just read mdstat and need to compare it with | |
710 | * the known active arrays. | |
711 | * Arrays with the wrong metadata are ignored. | |
712 | */ | |
713 | ||
714 | for ( ; mdstat ; mdstat = mdstat->next) { | |
715 | struct active_array *a; | |
716 | if (mdstat->devnum == container->devnum) { | |
717 | manage_container(mdstat, container); | |
718 | continue; | |
719 | } | |
883a6142 | 720 | if (!is_container_member(mdstat, container->devname)) |
549e9569 NB |
721 | /* Not for this array */ |
722 | continue; | |
723 | /* Looks like a member of this container */ | |
5d19760d | 724 | for (a = container->arrays; a; a = a->next) { |
549e9569 NB |
725 | if (mdstat->devnum == a->devnum) { |
726 | if (a->container) | |
727 | manage_member(mdstat, a); | |
728 | break; | |
729 | } | |
730 | } | |
2a0bb19e DW |
731 | if (a == NULL || !a->container) |
732 | manage_new(mdstat, container, a); | |
549e9569 NB |
733 | } |
734 | } | |
735 | ||
edd8d13c | 736 | static void handle_message(struct supertype *container, struct metadata_update *msg) |
3e70c845 | 737 | { |
edd8d13c NB |
738 | /* queue this metadata update through to the monitor */ |
739 | ||
740 | struct metadata_update *mu; | |
741 | ||
313a4a82 | 742 | if (msg->len <= 0) |
3c00ffbe N |
743 | while (update_queue_pending || update_queue) { |
744 | check_update_queue(container); | |
745 | usleep(15*1000); | |
746 | } | |
747 | ||
313a4a82 DW |
748 | if (msg->len == 0) { /* ping_monitor */ |
749 | int cnt; | |
750 | ||
3c00ffbe | 751 | cnt = monitor_loop_cnt; |
1eb252b8 N |
752 | if (cnt & 1) |
753 | cnt += 2; /* wait until next pselect */ | |
754 | else | |
755 | cnt += 3; /* wait for 2 pselects */ | |
756 | wakeup_monitor(); | |
3c00ffbe | 757 | |
1eb252b8 N |
758 | while (monitor_loop_cnt - cnt < 0) |
759 | usleep(10 * 1000); | |
313a4a82 DW |
760 | } else if (msg->len == -1) { /* ping_manager */ |
761 | struct mdstat_ent *mdstat = mdstat_read(1, 0); | |
762 | ||
763 | manage(mdstat, container); | |
764 | free_mdstat(mdstat); | |
6144ed44 | 765 | } else if (!sigterm) { |
edd8d13c NB |
766 | mu = malloc(sizeof(*mu)); |
767 | mu->len = msg->len; | |
768 | mu->buf = msg->buf; | |
769 | msg->buf = NULL; | |
770 | mu->space = NULL; | |
cb23f1f4 | 771 | mu->space_list = NULL; |
edd8d13c NB |
772 | mu->next = NULL; |
773 | if (container->ss->prepare_update) | |
774 | container->ss->prepare_update(container, mu); | |
775 | queue_metadata_update(mu); | |
776 | } | |
3e70c845 DW |
777 | } |
778 | ||
779 | void read_sock(struct supertype *container) | |
549e9569 NB |
780 | { |
781 | int fd; | |
bfa44e2e | 782 | struct metadata_update msg; |
b109d928 DW |
783 | int terminate = 0; |
784 | long fl; | |
785 | int tmo = 3; /* 3 second timeout before hanging up the socket */ | |
549e9569 | 786 | |
3e70c845 | 787 | fd = accept(container->sock, NULL, NULL); |
549e9569 NB |
788 | if (fd < 0) |
789 | return; | |
b109d928 DW |
790 | |
791 | fl = fcntl(fd, F_GETFL, 0); | |
792 | fl |= O_NONBLOCK; | |
793 | fcntl(fd, F_SETFL, fl); | |
794 | ||
795 | do { | |
796 | msg.buf = NULL; | |
797 | ||
798 | /* read and validate the message */ | |
799 | if (receive_message(fd, &msg, tmo) == 0) { | |
bfa44e2e | 800 | handle_message(container, &msg); |
bc77ed53 DW |
801 | if (msg.len == 0) { |
802 | /* ping reply with version */ | |
803 | msg.buf = Version; | |
804 | msg.len = strlen(Version) + 1; | |
805 | if (send_message(fd, &msg, tmo) < 0) | |
806 | terminate = 1; | |
807 | } else if (ack(fd, tmo) < 0) | |
bfa44e2e NB |
808 | terminate = 1; |
809 | } else | |
b109d928 | 810 | terminate = 1; |
b109d928 | 811 | |
b109d928 DW |
812 | } while (!terminate); |
813 | ||
549e9569 NB |
814 | close(fd); |
815 | } | |
1ed3f387 | 816 | |
e0d6609f NB |
817 | int exit_now = 0; |
818 | int manager_ready = 0; | |
549e9569 NB |
819 | void do_manager(struct supertype *container) |
820 | { | |
821 | struct mdstat_ent *mdstat; | |
4d43913c | 822 | sigset_t set; |
1ed3f387 | 823 | |
4d43913c NB |
824 | sigprocmask(SIG_UNBLOCK, NULL, &set); |
825 | sigdelset(&set, SIGUSR1); | |
6144ed44 | 826 | sigdelset(&set, SIGTERM); |
549e9569 NB |
827 | |
828 | do { | |
1ed3f387 | 829 | |
e0d6609f NB |
830 | if (exit_now) |
831 | exit(0); | |
832 | ||
3c00ffbe N |
833 | /* Can only 'manage' things if 'monitor' is not making |
834 | * structural changes to metadata, so need to check | |
835 | * update_queue | |
836 | */ | |
837 | if (update_queue == NULL) { | |
838 | mdstat = mdstat_read(1, 0); | |
549e9569 | 839 | |
3c00ffbe | 840 | manage(mdstat, container); |
549e9569 | 841 | |
3c00ffbe | 842 | read_sock(container); |
4fa5aef9 | 843 | |
3c00ffbe N |
844 | free_mdstat(mdstat); |
845 | } | |
1ed3f387 NB |
846 | remove_old(); |
847 | ||
2e735d19 NB |
848 | check_update_queue(container); |
849 | ||
e0d6609f | 850 | manager_ready = 1; |
4d43913c | 851 | |
6144ed44 DW |
852 | if (sigterm) |
853 | wakeup_monitor(); | |
854 | ||
5d4d1b26 | 855 | if (update_queue == NULL) |
58a4ba2a | 856 | mdstat_wait_fd(container->sock, &set); |
5d4d1b26 | 857 | else |
3c00ffbe N |
858 | /* If an update is happening, just wait for signal */ |
859 | pselect(0, NULL, NULL, NULL, NULL, &set); | |
549e9569 NB |
860 | } while(1); |
861 | } |