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Commit | Line | Data |
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549e9569 NB |
1 | |
2 | #include "mdadm.h" | |
3 | #include "mdmon.h" | |
4d43913c | 4 | #include <sys/syscall.h> |
549e9569 | 5 | #include <sys/select.h> |
1ed3f387 | 6 | #include <signal.h> |
549e9569 NB |
7 | |
8 | static char *array_states[] = { | |
9 | "clear", "inactive", "suspended", "readonly", "read-auto", | |
10 | "clean", "active", "write-pending", "active-idle", NULL }; | |
11 | static char *sync_actions[] = { | |
12 | "idle", "reshape", "resync", "recover", "check", "repair", NULL | |
13 | }; | |
14 | ||
15 | static int write_attr(char *attr, int fd) | |
16 | { | |
17 | return write(fd, attr, strlen(attr)); | |
18 | } | |
19 | ||
20 | static void add_fd(fd_set *fds, int *maxfd, int fd) | |
21 | { | |
22 | if (fd < 0) | |
23 | return; | |
24 | if (fd > *maxfd) | |
25 | *maxfd = fd; | |
26 | FD_SET(fd, fds); | |
27 | } | |
28 | ||
29 | static int read_attr(char *buf, int len, int fd) | |
30 | { | |
31 | int n; | |
32 | ||
33 | if (fd < 0) { | |
34 | buf[0] = 0; | |
35 | return 0; | |
36 | } | |
37 | lseek(fd, 0, 0); | |
38 | n = read(fd, buf, len - 1); | |
39 | ||
40 | if (n <= 0) { | |
41 | buf[0] = 0; | |
42 | return 0; | |
43 | } | |
44 | buf[n] = 0; | |
45 | if (buf[n-1] == '\n') | |
46 | buf[n-1] = 0; | |
47 | return n; | |
48 | } | |
49 | ||
103f2410 | 50 | int get_resync_start(struct active_array *a) |
c052ba30 DW |
51 | { |
52 | char buf[30]; | |
53 | int n; | |
54 | ||
55 | n = read_attr(buf, 30, a->resync_start_fd); | |
56 | if (n <= 0) | |
57 | return n; | |
58 | ||
59 | a->resync_start = strtoull(buf, NULL, 10); | |
60 | ||
61 | return 1; | |
62 | } | |
549e9569 | 63 | |
549e9569 NB |
64 | |
65 | static enum array_state read_state(int fd) | |
66 | { | |
67 | char buf[20]; | |
68 | int n = read_attr(buf, 20, fd); | |
69 | ||
70 | if (n <= 0) | |
71 | return bad_word; | |
1770662b | 72 | return (enum array_state) sysfs_match_word(buf, array_states); |
549e9569 NB |
73 | } |
74 | ||
75 | static enum sync_action read_action( int fd) | |
76 | { | |
77 | char buf[20]; | |
78 | int n = read_attr(buf, 20, fd); | |
79 | ||
80 | if (n <= 0) | |
81 | return bad_action; | |
1770662b | 82 | return (enum sync_action) sysfs_match_word(buf, sync_actions); |
549e9569 NB |
83 | } |
84 | ||
549e9569 NB |
85 | int read_dev_state(int fd) |
86 | { | |
87 | char buf[60]; | |
88 | int n = read_attr(buf, 60, fd); | |
89 | char *cp; | |
90 | int rv = 0; | |
91 | ||
92 | if (n <= 0) | |
93 | return 0; | |
94 | ||
95 | cp = buf; | |
96 | while (cp) { | |
1770662b | 97 | if (sysfs_attr_match(cp, "faulty")) |
549e9569 | 98 | rv |= DS_FAULTY; |
1770662b | 99 | if (sysfs_attr_match(cp, "in_sync")) |
549e9569 | 100 | rv |= DS_INSYNC; |
1770662b | 101 | if (sysfs_attr_match(cp, "write_mostly")) |
549e9569 | 102 | rv |= DS_WRITE_MOSTLY; |
1770662b | 103 | if (sysfs_attr_match(cp, "spare")) |
549e9569 | 104 | rv |= DS_SPARE; |
1770662b | 105 | if (sysfs_attr_match(cp, "blocked")) |
8d45d196 | 106 | rv |= DS_BLOCKED; |
549e9569 NB |
107 | cp = strchr(cp, ','); |
108 | if (cp) | |
109 | cp++; | |
110 | } | |
111 | return rv; | |
112 | } | |
113 | ||
1ed3f387 NB |
114 | static void signal_manager(void) |
115 | { | |
4d43913c NB |
116 | /* tgkill(getpid(), mon_tid, SIGUSR1); */ |
117 | int pid = getpid(); | |
118 | syscall(SYS_tgkill, pid, mgr_tid, SIGUSR1); | |
1ed3f387 | 119 | } |
549e9569 NB |
120 | |
121 | /* Monitor a set of active md arrays - all of which share the | |
122 | * same metadata - and respond to events that require | |
123 | * metadata update. | |
124 | * | |
125 | * New arrays are detected by another thread which allocates | |
126 | * required memory and attaches the data structure to our list. | |
127 | * | |
128 | * Events: | |
129 | * Array stops. | |
130 | * This is detected by array_state going to 'clear' or 'inactive'. | |
131 | * while we thought it was active. | |
132 | * Response is to mark metadata as clean and 'clear' the array(??) | |
133 | * write-pending | |
134 | * array_state if 'write-pending' | |
135 | * We mark metadata as 'dirty' then set array to 'active'. | |
136 | * active_idle | |
137 | * Either ignore, or mark clean, then mark metadata as clean. | |
138 | * | |
139 | * device fails | |
140 | * detected by rd-N/state reporting "faulty" | |
8d45d196 DW |
141 | * mark device as 'failed' in metadata, let the kernel release the |
142 | * device by writing '-blocked' to rd/state, and finally write 'remove' to | |
0af73f61 DW |
143 | * rd/state. Before a disk can be replaced it must be failed and removed |
144 | * from all container members, this will be preemptive for the other | |
145 | * arrays... safe? | |
549e9569 NB |
146 | * |
147 | * sync completes | |
148 | * sync_action was 'resync' and becomes 'idle' and resync_start becomes | |
149 | * MaxSector | |
150 | * Notify metadata that sync is complete. | |
549e9569 NB |
151 | * |
152 | * recovery completes | |
153 | * sync_action changes from 'recover' to 'idle' | |
154 | * Check each device state and mark metadata if 'faulty' or 'in_sync'. | |
549e9569 NB |
155 | * |
156 | * deal with resync | |
c052ba30 DW |
157 | * This only happens on finding a new array... mdadm will have set |
158 | * 'resync_start' to the correct value. If 'resync_start' indicates that an | |
159 | * resync needs to occur set the array to the 'active' state rather than the | |
160 | * initial read-auto state. | |
549e9569 NB |
161 | * |
162 | * | |
163 | * | |
164 | * We wait for a change (poll/select) on array_state, sync_action, and | |
165 | * each rd-X/state file. | |
166 | * When we get any change, we check everything. So read each state file, | |
167 | * then decide what to do. | |
168 | * | |
169 | * The core action is to write new metadata to all devices in the array. | |
170 | * This is done at most once on any wakeup. | |
171 | * After that we might: | |
172 | * - update the array_state | |
173 | * - set the role of some devices. | |
174 | * - request a sync_action | |
175 | * | |
176 | */ | |
177 | ||
178 | static int read_and_act(struct active_array *a) | |
179 | { | |
6c3fb95c | 180 | int check_degraded = 0; |
2a0bb19e | 181 | int deactivate = 0; |
549e9569 NB |
182 | struct mdinfo *mdi; |
183 | ||
184 | a->next_state = bad_word; | |
185 | a->next_action = bad_action; | |
186 | ||
187 | a->curr_state = read_state(a->info.state_fd); | |
188 | a->curr_action = read_action(a->action_fd); | |
189 | for (mdi = a->info.devs; mdi ; mdi = mdi->next) { | |
190 | mdi->next_state = 0; | |
57632f4a | 191 | if (mdi->state_fd >= 0) |
8d45d196 | 192 | mdi->curr_state = read_dev_state(mdi->state_fd); |
549e9569 NB |
193 | } |
194 | ||
195 | if (a->curr_state <= inactive && | |
196 | a->prev_state > inactive) { | |
197 | /* array has been stopped */ | |
33af8567 | 198 | get_resync_start(a); |
ed9d66aa | 199 | a->container->ss->set_array_state(a, 1); |
549e9569 | 200 | a->next_state = clear; |
2a0bb19e | 201 | deactivate = 1; |
549e9569 NB |
202 | } |
203 | if (a->curr_state == write_pending) { | |
ed9d66aa NB |
204 | get_resync_start(a); |
205 | a->container->ss->set_array_state(a, 0); | |
549e9569 NB |
206 | a->next_state = active; |
207 | } | |
208 | if (a->curr_state == active_idle) { | |
d797a062 DW |
209 | /* Set array to 'clean' FIRST, then mark clean |
210 | * in the metadata | |
549e9569 | 211 | */ |
d797a062 DW |
212 | a->next_state = clean; |
213 | } | |
214 | if (a->curr_state == clean) { | |
215 | get_resync_start(a); | |
216 | a->container->ss->set_array_state(a, 1); | |
549e9569 NB |
217 | } |
218 | ||
219 | if (a->curr_state == readonly) { | |
e9dd1598 N |
220 | /* Well, I'm ready to handle things. If readonly |
221 | * wasn't requested, transition to read-auto. | |
549e9569 | 222 | */ |
e9dd1598 N |
223 | char buf[64]; |
224 | read_attr(buf, sizeof(buf), a->metadata_fd); | |
225 | if (strncmp(buf, "external:-", 10) == 0) { | |
226 | /* explicit request for readonly array. Leave it alone */ | |
227 | ; | |
228 | } else { | |
229 | get_resync_start(a); | |
230 | if (a->container->ss->set_array_state(a, 2)) | |
231 | a->next_state = read_auto; /* array is clean */ | |
232 | else | |
233 | a->next_state = active; /* Now active for recovery etc */ | |
234 | } | |
549e9569 NB |
235 | } |
236 | ||
00e02142 DW |
237 | if (!deactivate && |
238 | a->curr_action == idle && | |
549e9569 | 239 | a->prev_action == resync) { |
4e5528c6 NB |
240 | /* A resync has finished. The endpoint is recorded in |
241 | * 'sync_start'. We don't update the metadata | |
242 | * until the array goes inactive or readonly though. | |
243 | * Just check if we need to fiddle spares. | |
244 | */ | |
77402e51 | 245 | get_resync_start(a); |
0c0c44db | 246 | a->container->ss->set_array_state(a, a->curr_state <= clean); |
549e9569 NB |
247 | check_degraded = 1; |
248 | } | |
249 | ||
00e02142 DW |
250 | if (!deactivate && |
251 | a->curr_action == idle && | |
549e9569 | 252 | a->prev_action == recover) { |
0a6bdbee DW |
253 | /* A recovery has finished. Some disks may be in sync now, |
254 | * and the array may no longer be degraded | |
255 | */ | |
549e9569 | 256 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) { |
8d45d196 DW |
257 | a->container->ss->set_disk(a, mdi->disk.raid_disk, |
258 | mdi->curr_state); | |
549e9569 NB |
259 | if (! (mdi->curr_state & DS_INSYNC)) |
260 | check_degraded = 1; | |
261 | } | |
262 | } | |
263 | ||
92967543 DW |
264 | /* Check for failures and if found: |
265 | * 1/ Record the failure in the metadata and unblock the device. | |
266 | * FIXME update the kernel to stop notifying on failed drives when | |
267 | * the array is readonly and we have cleared 'blocked' | |
268 | * 2/ Try to remove the device if the array is writable, or can be | |
269 | * made writable. | |
270 | */ | |
549e9569 NB |
271 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) { |
272 | if (mdi->curr_state & DS_FAULTY) { | |
8d45d196 DW |
273 | a->container->ss->set_disk(a, mdi->disk.raid_disk, |
274 | mdi->curr_state); | |
549e9569 | 275 | check_degraded = 1; |
92967543 DW |
276 | mdi->next_state |= DS_UNBLOCK; |
277 | if (a->curr_state == read_auto) { | |
278 | a->container->ss->set_array_state(a, 0); | |
279 | a->next_state = active; | |
280 | } | |
281 | if (a->curr_state > readonly) | |
282 | mdi->next_state |= DS_REMOVE; | |
549e9569 NB |
283 | } |
284 | } | |
285 | ||
2e735d19 | 286 | a->container->ss->sync_metadata(a->container); |
4065aa81 DW |
287 | dprintf("%s(%d): state:%s action:%s next(", __func__, a->info.container_member, |
288 | array_states[a->curr_state], sync_actions[a->curr_action]); | |
549e9569 NB |
289 | |
290 | /* Effect state changes in the array */ | |
4e6e574a DW |
291 | if (a->next_state != bad_word) { |
292 | dprintf(" state:%s", array_states[a->next_state]); | |
549e9569 | 293 | write_attr(array_states[a->next_state], a->info.state_fd); |
4e6e574a DW |
294 | } |
295 | if (a->next_action != bad_action) { | |
549e9569 | 296 | write_attr(sync_actions[a->next_action], a->action_fd); |
4065aa81 | 297 | dprintf(" action:%s", sync_actions[a->next_action]); |
4e6e574a | 298 | } |
549e9569 | 299 | for (mdi = a->info.devs; mdi ; mdi = mdi->next) { |
92967543 DW |
300 | if (mdi->next_state & DS_UNBLOCK) { |
301 | dprintf(" %d:-blocked", mdi->disk.raid_disk); | |
302 | write_attr("-blocked", mdi->state_fd); | |
303 | } | |
304 | ||
305 | if ((mdi->next_state & DS_REMOVE) && mdi->state_fd >= 0) { | |
57632f4a | 306 | int remove_result; |
8d45d196 | 307 | |
8d45d196 DW |
308 | /* the kernel may not be able to immediately remove the |
309 | * disk, we can simply wait until the next event to try | |
310 | * again. | |
311 | */ | |
57632f4a NB |
312 | remove_result = write_attr("remove", mdi->state_fd); |
313 | if (remove_result > 0) { | |
4e6e574a | 314 | dprintf(" %d:removed", mdi->disk.raid_disk); |
8d45d196 DW |
315 | close(mdi->state_fd); |
316 | mdi->state_fd = -1; | |
317 | } | |
318 | } | |
4e6e574a | 319 | if (mdi->next_state & DS_INSYNC) { |
549e9569 | 320 | write_attr("+in_sync", mdi->state_fd); |
4e6e574a DW |
321 | dprintf(" %d:+in_sync", mdi->disk.raid_disk); |
322 | } | |
549e9569 | 323 | } |
4e6e574a | 324 | dprintf(" )\n"); |
549e9569 NB |
325 | |
326 | /* move curr_ to prev_ */ | |
327 | a->prev_state = a->curr_state; | |
328 | ||
329 | a->prev_action = a->curr_action; | |
330 | ||
331 | for (mdi = a->info.devs; mdi ; mdi = mdi->next) { | |
332 | mdi->prev_state = mdi->curr_state; | |
333 | mdi->next_state = 0; | |
334 | } | |
335 | ||
7e1432fb NB |
336 | if (check_degraded) { |
337 | /* manager will do the actual check */ | |
338 | a->check_degraded = 1; | |
339 | signal_manager(); | |
340 | } | |
341 | ||
2a0bb19e DW |
342 | if (deactivate) |
343 | a->container = NULL; | |
344 | ||
549e9569 NB |
345 | return 1; |
346 | } | |
347 | ||
0af73f61 DW |
348 | static struct mdinfo * |
349 | find_device(struct active_array *a, int major, int minor) | |
350 | { | |
351 | struct mdinfo *mdi; | |
352 | ||
353 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) | |
354 | if (mdi->disk.major == major && mdi->disk.minor == minor) | |
355 | return mdi; | |
356 | ||
357 | return NULL; | |
358 | } | |
359 | ||
360 | static void reconcile_failed(struct active_array *aa, struct mdinfo *failed) | |
361 | { | |
362 | struct active_array *a; | |
363 | struct mdinfo *victim; | |
364 | ||
365 | for (a = aa; a; a = a->next) { | |
366 | if (!a->container) | |
367 | continue; | |
368 | victim = find_device(a, failed->disk.major, failed->disk.minor); | |
369 | if (!victim) | |
370 | continue; | |
371 | ||
372 | if (!(victim->curr_state & DS_FAULTY)) | |
373 | write_attr("faulty", victim->state_fd); | |
374 | } | |
375 | } | |
376 | ||
4e6e574a DW |
377 | #ifdef DEBUG |
378 | static void dprint_wake_reasons(fd_set *fds) | |
379 | { | |
380 | int i; | |
381 | char proc_path[256]; | |
382 | char link[256]; | |
383 | char *basename; | |
384 | int rv; | |
385 | ||
386 | fprintf(stderr, "monitor: wake ( "); | |
387 | for (i = 0; i < FD_SETSIZE; i++) { | |
388 | if (FD_ISSET(i, fds)) { | |
389 | sprintf(proc_path, "/proc/%d/fd/%d", | |
390 | (int) getpid(), i); | |
391 | ||
392 | rv = readlink(proc_path, link, sizeof(link) - 1); | |
393 | if (rv < 0) { | |
394 | fprintf(stderr, "%d:unknown ", i); | |
395 | continue; | |
396 | } | |
397 | link[rv] = '\0'; | |
398 | basename = strrchr(link, '/'); | |
399 | fprintf(stderr, "%d:%s ", | |
400 | i, basename ? ++basename : link); | |
401 | } | |
402 | } | |
403 | fprintf(stderr, ")\n"); | |
404 | } | |
405 | #endif | |
406 | ||
1eb252b8 N |
407 | int monitor_loop_cnt; |
408 | ||
4d43913c | 409 | static int wait_and_act(struct supertype *container, int nowait) |
549e9569 NB |
410 | { |
411 | fd_set rfds; | |
412 | int maxfd = 0; | |
e0d6609f | 413 | struct active_array **aap = &container->arrays; |
1ed3f387 | 414 | struct active_array *a, **ap; |
549e9569 | 415 | int rv; |
0af73f61 | 416 | struct mdinfo *mdi; |
549e9569 NB |
417 | |
418 | FD_ZERO(&rfds); | |
419 | ||
1ed3f387 NB |
420 | for (ap = aap ; *ap ;) { |
421 | a = *ap; | |
422 | /* once an array has been deactivated we want to | |
423 | * ask the manager to discard it. | |
2a0bb19e | 424 | */ |
1ed3f387 NB |
425 | if (!a->container) { |
426 | if (discard_this) { | |
427 | ap = &(*ap)->next; | |
428 | continue; | |
429 | } | |
430 | *ap = a->next; | |
431 | a->next = NULL; | |
432 | discard_this = a; | |
433 | signal_manager(); | |
2a0bb19e | 434 | continue; |
1ed3f387 | 435 | } |
2a0bb19e | 436 | |
549e9569 NB |
437 | add_fd(&rfds, &maxfd, a->info.state_fd); |
438 | add_fd(&rfds, &maxfd, a->action_fd); | |
439 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) | |
440 | add_fd(&rfds, &maxfd, mdi->state_fd); | |
1ed3f387 NB |
441 | |
442 | ap = &(*ap)->next; | |
549e9569 NB |
443 | } |
444 | ||
e0d6609f NB |
445 | if (manager_ready && *aap == NULL) { |
446 | /* No interesting arrays. Lets see about exiting. | |
447 | * Note that blocking at this point is not a problem | |
448 | * as there are no active arrays, there is nothing that | |
449 | * we need to be ready to do. | |
450 | */ | |
451 | int fd = open(container->device_name, O_RDONLY|O_EXCL); | |
452 | if (fd >= 0 || errno != EBUSY) { | |
453 | /* OK, we are safe to leave */ | |
4e6e574a | 454 | dprintf("no arrays to monitor... exiting\n"); |
207aac36 | 455 | remove_pidfile(container->devname); |
e0d6609f NB |
456 | exit_now = 1; |
457 | signal_manager(); | |
e0d6609f NB |
458 | exit(0); |
459 | } | |
460 | } | |
461 | ||
549e9569 | 462 | if (!nowait) { |
4d43913c NB |
463 | sigset_t set; |
464 | sigprocmask(SIG_UNBLOCK, NULL, &set); | |
465 | sigdelset(&set, SIGUSR1); | |
1eb252b8 | 466 | monitor_loop_cnt |= 1; |
4d43913c | 467 | rv = pselect(maxfd+1, &rfds, NULL, NULL, NULL, &set); |
1eb252b8 | 468 | monitor_loop_cnt += 1; |
bfa44e2e NB |
469 | if (rv == -1 && errno == EINTR) |
470 | rv = 0; | |
4e6e574a DW |
471 | #ifdef DEBUG |
472 | dprint_wake_reasons(&rfds); | |
473 | #endif | |
474 | ||
549e9569 NB |
475 | } |
476 | ||
2e735d19 NB |
477 | if (update_queue) { |
478 | struct metadata_update *this; | |
479 | ||
480 | for (this = update_queue; this ; this = this->next) | |
481 | container->ss->process_update(container, this); | |
482 | ||
483 | update_queue_handled = update_queue; | |
484 | update_queue = NULL; | |
485 | signal_manager(); | |
486 | container->ss->sync_metadata(container); | |
487 | } | |
488 | ||
1ed3f387 | 489 | for (a = *aap; a ; a = a->next) { |
2a0bb19e | 490 | if (a->replaces && !discard_this) { |
549e9569 NB |
491 | struct active_array **ap; |
492 | for (ap = &a->next; *ap && *ap != a->replaces; | |
493 | ap = & (*ap)->next) | |
494 | ; | |
495 | if (*ap) | |
496 | *ap = (*ap)->next; | |
497 | discard_this = a->replaces; | |
498 | a->replaces = NULL; | |
6c3fb95c | 499 | /* FIXME check if device->state_fd need to be cleared?*/ |
1ed3f387 | 500 | signal_manager(); |
549e9569 | 501 | } |
2a0bb19e DW |
502 | if (a->container) |
503 | rv += read_and_act(a); | |
549e9569 | 504 | } |
0af73f61 DW |
505 | |
506 | /* propagate failures across container members */ | |
1ed3f387 | 507 | for (a = *aap; a ; a = a->next) { |
0af73f61 DW |
508 | if (!a->container) |
509 | continue; | |
510 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) | |
511 | if (mdi->curr_state & DS_FAULTY) | |
1ed3f387 | 512 | reconcile_failed(*aap, mdi); |
0af73f61 DW |
513 | } |
514 | ||
549e9569 NB |
515 | return rv; |
516 | } | |
517 | ||
518 | void do_monitor(struct supertype *container) | |
519 | { | |
520 | int rv; | |
521 | int first = 1; | |
522 | do { | |
4d43913c | 523 | rv = wait_and_act(container, first); |
549e9569 NB |
524 | first = 0; |
525 | } while (rv >= 0); | |
526 | } |