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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 | #include "mdadm.h" | |
22 | #include "mdmon.h" | |
4d43913c | 23 | #include <sys/syscall.h> |
549e9569 | 24 | #include <sys/select.h> |
1ed3f387 | 25 | #include <signal.h> |
549e9569 NB |
26 | |
27 | static char *array_states[] = { | |
28 | "clear", "inactive", "suspended", "readonly", "read-auto", | |
29 | "clean", "active", "write-pending", "active-idle", NULL }; | |
30 | static char *sync_actions[] = { | |
31 | "idle", "reshape", "resync", "recover", "check", "repair", NULL | |
32 | }; | |
33 | ||
34 | static int write_attr(char *attr, int fd) | |
35 | { | |
36 | return write(fd, attr, strlen(attr)); | |
37 | } | |
38 | ||
39 | static void add_fd(fd_set *fds, int *maxfd, int fd) | |
40 | { | |
41 | if (fd < 0) | |
42 | return; | |
43 | if (fd > *maxfd) | |
44 | *maxfd = fd; | |
45 | FD_SET(fd, fds); | |
46 | } | |
47 | ||
48 | static int read_attr(char *buf, int len, int fd) | |
49 | { | |
50 | int n; | |
51 | ||
52 | if (fd < 0) { | |
53 | buf[0] = 0; | |
54 | return 0; | |
55 | } | |
56 | lseek(fd, 0, 0); | |
57 | n = read(fd, buf, len - 1); | |
58 | ||
59 | if (n <= 0) { | |
60 | buf[0] = 0; | |
61 | return 0; | |
62 | } | |
63 | buf[n] = 0; | |
64 | if (buf[n-1] == '\n') | |
65 | buf[n-1] = 0; | |
66 | return n; | |
67 | } | |
68 | ||
b7941fd6 | 69 | static unsigned long long read_resync_start(int fd) |
c052ba30 DW |
70 | { |
71 | char buf[30]; | |
72 | int n; | |
73 | ||
b7941fd6 | 74 | n = read_attr(buf, 30, fd); |
c052ba30 | 75 | if (n <= 0) |
b7941fd6 | 76 | return 0; |
7e7fffc4 | 77 | if (strncmp(buf, "none", 4) == 0) |
b7528a20 | 78 | return MaxSector; |
7e7fffc4 | 79 | else |
b7941fd6 | 80 | return strtoull(buf, NULL, 10); |
c052ba30 | 81 | } |
549e9569 | 82 | |
484240d8 DW |
83 | static unsigned long long read_sync_completed(int fd) |
84 | { | |
85 | unsigned long long val; | |
86 | char buf[50]; | |
87 | int n; | |
88 | char *ep; | |
89 | ||
90 | n = read_attr(buf, 50, fd); | |
91 | ||
92 | if (n <= 0) | |
93 | return 0; | |
94 | buf[n] = 0; | |
95 | val = strtoull(buf, &ep, 0); | |
96 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
97 | return 0; | |
98 | return val; | |
99 | } | |
100 | ||
549e9569 NB |
101 | static enum array_state read_state(int fd) |
102 | { | |
103 | char buf[20]; | |
104 | int n = read_attr(buf, 20, fd); | |
105 | ||
106 | if (n <= 0) | |
107 | return bad_word; | |
1770662b | 108 | return (enum array_state) sysfs_match_word(buf, array_states); |
549e9569 NB |
109 | } |
110 | ||
111 | static enum sync_action read_action( int fd) | |
112 | { | |
113 | char buf[20]; | |
114 | int n = read_attr(buf, 20, fd); | |
115 | ||
116 | if (n <= 0) | |
117 | return bad_action; | |
1770662b | 118 | return (enum sync_action) sysfs_match_word(buf, sync_actions); |
549e9569 NB |
119 | } |
120 | ||
549e9569 NB |
121 | int read_dev_state(int fd) |
122 | { | |
123 | char buf[60]; | |
124 | int n = read_attr(buf, 60, fd); | |
125 | char *cp; | |
126 | int rv = 0; | |
127 | ||
128 | if (n <= 0) | |
129 | return 0; | |
130 | ||
131 | cp = buf; | |
132 | while (cp) { | |
1770662b | 133 | if (sysfs_attr_match(cp, "faulty")) |
549e9569 | 134 | rv |= DS_FAULTY; |
1770662b | 135 | if (sysfs_attr_match(cp, "in_sync")) |
549e9569 | 136 | rv |= DS_INSYNC; |
1770662b | 137 | if (sysfs_attr_match(cp, "write_mostly")) |
549e9569 | 138 | rv |= DS_WRITE_MOSTLY; |
1770662b | 139 | if (sysfs_attr_match(cp, "spare")) |
549e9569 | 140 | rv |= DS_SPARE; |
1770662b | 141 | if (sysfs_attr_match(cp, "blocked")) |
8d45d196 | 142 | rv |= DS_BLOCKED; |
549e9569 NB |
143 | cp = strchr(cp, ','); |
144 | if (cp) | |
145 | cp++; | |
146 | } | |
147 | return rv; | |
148 | } | |
149 | ||
1ed3f387 NB |
150 | static void signal_manager(void) |
151 | { | |
4d43913c NB |
152 | /* tgkill(getpid(), mon_tid, SIGUSR1); */ |
153 | int pid = getpid(); | |
154 | syscall(SYS_tgkill, pid, mgr_tid, SIGUSR1); | |
1ed3f387 | 155 | } |
549e9569 NB |
156 | |
157 | /* Monitor a set of active md arrays - all of which share the | |
158 | * same metadata - and respond to events that require | |
159 | * metadata update. | |
160 | * | |
161 | * New arrays are detected by another thread which allocates | |
162 | * required memory and attaches the data structure to our list. | |
163 | * | |
164 | * Events: | |
165 | * Array stops. | |
166 | * This is detected by array_state going to 'clear' or 'inactive'. | |
167 | * while we thought it was active. | |
168 | * Response is to mark metadata as clean and 'clear' the array(??) | |
169 | * write-pending | |
170 | * array_state if 'write-pending' | |
171 | * We mark metadata as 'dirty' then set array to 'active'. | |
172 | * active_idle | |
173 | * Either ignore, or mark clean, then mark metadata as clean. | |
174 | * | |
175 | * device fails | |
176 | * detected by rd-N/state reporting "faulty" | |
8d45d196 DW |
177 | * mark device as 'failed' in metadata, let the kernel release the |
178 | * device by writing '-blocked' to rd/state, and finally write 'remove' to | |
0af73f61 DW |
179 | * rd/state. Before a disk can be replaced it must be failed and removed |
180 | * from all container members, this will be preemptive for the other | |
181 | * arrays... safe? | |
549e9569 NB |
182 | * |
183 | * sync completes | |
184 | * sync_action was 'resync' and becomes 'idle' and resync_start becomes | |
185 | * MaxSector | |
186 | * Notify metadata that sync is complete. | |
549e9569 NB |
187 | * |
188 | * recovery completes | |
189 | * sync_action changes from 'recover' to 'idle' | |
190 | * Check each device state and mark metadata if 'faulty' or 'in_sync'. | |
549e9569 NB |
191 | * |
192 | * deal with resync | |
c052ba30 DW |
193 | * This only happens on finding a new array... mdadm will have set |
194 | * 'resync_start' to the correct value. If 'resync_start' indicates that an | |
195 | * resync needs to occur set the array to the 'active' state rather than the | |
196 | * initial read-auto state. | |
549e9569 NB |
197 | * |
198 | * | |
199 | * | |
200 | * We wait for a change (poll/select) on array_state, sync_action, and | |
201 | * each rd-X/state file. | |
202 | * When we get any change, we check everything. So read each state file, | |
203 | * then decide what to do. | |
204 | * | |
205 | * The core action is to write new metadata to all devices in the array. | |
206 | * This is done at most once on any wakeup. | |
207 | * After that we might: | |
208 | * - update the array_state | |
209 | * - set the role of some devices. | |
210 | * - request a sync_action | |
211 | * | |
212 | */ | |
213 | ||
214 | static int read_and_act(struct active_array *a) | |
215 | { | |
484240d8 | 216 | unsigned long long sync_completed; |
6c3fb95c | 217 | int check_degraded = 0; |
0f99b4bd | 218 | int check_reshape = 0; |
2a0bb19e | 219 | int deactivate = 0; |
549e9569 | 220 | struct mdinfo *mdi; |
140d3685 | 221 | int dirty = 0; |
549e9569 NB |
222 | |
223 | a->next_state = bad_word; | |
224 | a->next_action = bad_action; | |
225 | ||
226 | a->curr_state = read_state(a->info.state_fd); | |
227 | a->curr_action = read_action(a->action_fd); | |
b7941fd6 | 228 | a->info.resync_start = read_resync_start(a->resync_start_fd); |
484240d8 | 229 | sync_completed = read_sync_completed(a->sync_completed_fd); |
549e9569 NB |
230 | for (mdi = a->info.devs; mdi ; mdi = mdi->next) { |
231 | mdi->next_state = 0; | |
10ce1808 | 232 | mdi->curr_state = 0; |
e1516be1 DW |
233 | if (mdi->state_fd >= 0) { |
234 | mdi->recovery_start = read_resync_start(mdi->recovery_fd); | |
8d45d196 | 235 | mdi->curr_state = read_dev_state(mdi->state_fd); |
e1516be1 | 236 | } |
549e9569 NB |
237 | } |
238 | ||
4867e068 AK |
239 | if (a->curr_state > inactive && |
240 | a->prev_state == inactive) { | |
241 | /* array has been started | |
242 | * possible that container operation has to be completed | |
243 | */ | |
244 | a->container->ss->set_array_state(a, 0); | |
245 | } | |
549e9569 NB |
246 | if (a->curr_state <= inactive && |
247 | a->prev_state > inactive) { | |
248 | /* array has been stopped */ | |
ed9d66aa | 249 | a->container->ss->set_array_state(a, 1); |
549e9569 | 250 | a->next_state = clear; |
2a0bb19e | 251 | deactivate = 1; |
549e9569 NB |
252 | } |
253 | if (a->curr_state == write_pending) { | |
ed9d66aa | 254 | a->container->ss->set_array_state(a, 0); |
549e9569 | 255 | a->next_state = active; |
140d3685 | 256 | dirty = 1; |
549e9569 NB |
257 | } |
258 | if (a->curr_state == active_idle) { | |
d797a062 DW |
259 | /* Set array to 'clean' FIRST, then mark clean |
260 | * in the metadata | |
549e9569 | 261 | */ |
d797a062 | 262 | a->next_state = clean; |
140d3685 | 263 | dirty = 1; |
d797a062 DW |
264 | } |
265 | if (a->curr_state == clean) { | |
d797a062 | 266 | a->container->ss->set_array_state(a, 1); |
549e9569 | 267 | } |
140d3685 DW |
268 | if (a->curr_state == active || |
269 | a->curr_state == suspended || | |
270 | a->curr_state == bad_word) | |
271 | dirty = 1; | |
549e9569 | 272 | if (a->curr_state == readonly) { |
e9dd1598 N |
273 | /* Well, I'm ready to handle things. If readonly |
274 | * wasn't requested, transition to read-auto. | |
549e9569 | 275 | */ |
e9dd1598 N |
276 | char buf[64]; |
277 | read_attr(buf, sizeof(buf), a->metadata_fd); | |
278 | if (strncmp(buf, "external:-", 10) == 0) { | |
279 | /* explicit request for readonly array. Leave it alone */ | |
280 | ; | |
281 | } else { | |
e9dd1598 N |
282 | if (a->container->ss->set_array_state(a, 2)) |
283 | a->next_state = read_auto; /* array is clean */ | |
140d3685 | 284 | else { |
e9dd1598 | 285 | a->next_state = active; /* Now active for recovery etc */ |
140d3685 DW |
286 | dirty = 1; |
287 | } | |
e9dd1598 | 288 | } |
549e9569 NB |
289 | } |
290 | ||
00e02142 DW |
291 | if (!deactivate && |
292 | a->curr_action == idle && | |
549e9569 | 293 | a->prev_action == resync) { |
4e5528c6 NB |
294 | /* A resync has finished. The endpoint is recorded in |
295 | * 'sync_start'. We don't update the metadata | |
296 | * until the array goes inactive or readonly though. | |
297 | * Just check if we need to fiddle spares. | |
298 | */ | |
0c0c44db | 299 | a->container->ss->set_array_state(a, a->curr_state <= clean); |
549e9569 NB |
300 | check_degraded = 1; |
301 | } | |
302 | ||
00e02142 DW |
303 | if (!deactivate && |
304 | a->curr_action == idle && | |
549e9569 | 305 | a->prev_action == recover) { |
0a6bdbee DW |
306 | /* A recovery has finished. Some disks may be in sync now, |
307 | * and the array may no longer be degraded | |
308 | */ | |
549e9569 | 309 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) { |
8d45d196 DW |
310 | a->container->ss->set_disk(a, mdi->disk.raid_disk, |
311 | mdi->curr_state); | |
549e9569 NB |
312 | if (! (mdi->curr_state & DS_INSYNC)) |
313 | check_degraded = 1; | |
314 | } | |
315 | } | |
316 | ||
0f99b4bd N |
317 | if (!deactivate && |
318 | a->curr_action == reshape && | |
319 | a->prev_action != reshape) | |
320 | /* reshape was requested by mdadm. Need to see if | |
321 | * new devices have been added. Manager does that | |
322 | * when it sees check_reshape | |
323 | */ | |
324 | check_reshape = 1; | |
325 | ||
92967543 DW |
326 | /* Check for failures and if found: |
327 | * 1/ Record the failure in the metadata and unblock the device. | |
328 | * FIXME update the kernel to stop notifying on failed drives when | |
329 | * the array is readonly and we have cleared 'blocked' | |
330 | * 2/ Try to remove the device if the array is writable, or can be | |
331 | * made writable. | |
332 | */ | |
549e9569 NB |
333 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) { |
334 | if (mdi->curr_state & DS_FAULTY) { | |
8d45d196 DW |
335 | a->container->ss->set_disk(a, mdi->disk.raid_disk, |
336 | mdi->curr_state); | |
549e9569 | 337 | check_degraded = 1; |
92967543 DW |
338 | mdi->next_state |= DS_UNBLOCK; |
339 | if (a->curr_state == read_auto) { | |
340 | a->container->ss->set_array_state(a, 0); | |
341 | a->next_state = active; | |
342 | } | |
343 | if (a->curr_state > readonly) | |
344 | mdi->next_state |= DS_REMOVE; | |
549e9569 NB |
345 | } |
346 | } | |
347 | ||
484240d8 DW |
348 | /* Check for recovery checkpoint notifications. We need to be a |
349 | * minimum distance away from the last checkpoint to prevent | |
aad6f216 N |
350 | * over checkpointing. Note reshape checkpointing is handled |
351 | * in the second branch. | |
484240d8 DW |
352 | */ |
353 | if (sync_completed > a->last_checkpoint && | |
354 | sync_completed - a->last_checkpoint > a->info.component_size >> 4 && | |
4f0a7acc DW |
355 | a->curr_action > reshape) { |
356 | /* A (non-reshape) sync_action has reached a checkpoint. | |
357 | * Record the updated position in the metadata | |
358 | */ | |
359 | a->last_checkpoint = sync_completed; | |
360 | a->container->ss->set_array_state(a, a->curr_state <= clean); | |
aad6f216 N |
361 | } else if ((a->curr_action == idle && a->prev_action == reshape) || |
362 | (a->curr_action == reshape | |
363 | && sync_completed > a->last_checkpoint) ) { | |
364 | /* Reshape has progressed or completed so we need to | |
365 | * update the array state - and possibly the array size | |
366 | */ | |
2a9f8409 AK |
367 | if (sync_completed != 0) |
368 | a->last_checkpoint = sync_completed; | |
6d4225a1 AK |
369 | /* We might need to update last_checkpoint depending on |
370 | * the reason that reshape finished. | |
371 | * if array reshape is really finished: | |
372 | * set check point to the end, this allows | |
373 | * set_array_state() to finalize reshape in metadata | |
374 | * if reshape if broken: do not set checkpoint to the end | |
375 | * this allows for reshape restart from checkpoint | |
376 | */ | |
377 | if ((a->curr_action != reshape) && | |
378 | (a->prev_action == reshape)) { | |
379 | char buf[40]; | |
380 | if ((sysfs_get_str(&a->info, NULL, | |
381 | "reshape_position", | |
382 | buf, | |
383 | sizeof(buf)) >= 0) && | |
384 | strncmp(buf, "none", 4) == 0) | |
385 | a->last_checkpoint = a->info.component_size; | |
386 | } | |
aad6f216 | 387 | a->container->ss->set_array_state(a, a->curr_state <= clean); |
2a9f8409 | 388 | a->last_checkpoint = sync_completed; |
aad6f216 N |
389 | } |
390 | ||
391 | if (sync_completed > a->last_checkpoint) | |
484240d8 | 392 | a->last_checkpoint = sync_completed; |
484240d8 | 393 | |
2e735d19 | 394 | a->container->ss->sync_metadata(a->container); |
4065aa81 DW |
395 | dprintf("%s(%d): state:%s action:%s next(", __func__, a->info.container_member, |
396 | array_states[a->curr_state], sync_actions[a->curr_action]); | |
549e9569 NB |
397 | |
398 | /* Effect state changes in the array */ | |
4e6e574a DW |
399 | if (a->next_state != bad_word) { |
400 | dprintf(" state:%s", array_states[a->next_state]); | |
549e9569 | 401 | write_attr(array_states[a->next_state], a->info.state_fd); |
4e6e574a DW |
402 | } |
403 | if (a->next_action != bad_action) { | |
549e9569 | 404 | write_attr(sync_actions[a->next_action], a->action_fd); |
4065aa81 | 405 | dprintf(" action:%s", sync_actions[a->next_action]); |
4e6e574a | 406 | } |
549e9569 | 407 | for (mdi = a->info.devs; mdi ; mdi = mdi->next) { |
92967543 DW |
408 | if (mdi->next_state & DS_UNBLOCK) { |
409 | dprintf(" %d:-blocked", mdi->disk.raid_disk); | |
410 | write_attr("-blocked", mdi->state_fd); | |
411 | } | |
412 | ||
413 | if ((mdi->next_state & DS_REMOVE) && mdi->state_fd >= 0) { | |
57632f4a | 414 | int remove_result; |
8d45d196 | 415 | |
8d45d196 DW |
416 | /* the kernel may not be able to immediately remove the |
417 | * disk, we can simply wait until the next event to try | |
418 | * again. | |
419 | */ | |
57632f4a NB |
420 | remove_result = write_attr("remove", mdi->state_fd); |
421 | if (remove_result > 0) { | |
4e6e574a | 422 | dprintf(" %d:removed", mdi->disk.raid_disk); |
8d45d196 DW |
423 | close(mdi->state_fd); |
424 | mdi->state_fd = -1; | |
425 | } | |
426 | } | |
4e6e574a | 427 | if (mdi->next_state & DS_INSYNC) { |
549e9569 | 428 | write_attr("+in_sync", mdi->state_fd); |
4e6e574a DW |
429 | dprintf(" %d:+in_sync", mdi->disk.raid_disk); |
430 | } | |
549e9569 | 431 | } |
4e6e574a | 432 | dprintf(" )\n"); |
549e9569 NB |
433 | |
434 | /* move curr_ to prev_ */ | |
435 | a->prev_state = a->curr_state; | |
436 | ||
437 | a->prev_action = a->curr_action; | |
438 | ||
439 | for (mdi = a->info.devs; mdi ; mdi = mdi->next) { | |
440 | mdi->prev_state = mdi->curr_state; | |
441 | mdi->next_state = 0; | |
442 | } | |
443 | ||
0f99b4bd | 444 | if (check_degraded || check_reshape) { |
7e1432fb | 445 | /* manager will do the actual check */ |
0f99b4bd N |
446 | if (check_degraded) |
447 | a->check_degraded = 1; | |
448 | if (check_reshape) | |
449 | a->check_reshape = 1; | |
7e1432fb NB |
450 | signal_manager(); |
451 | } | |
452 | ||
2a0bb19e DW |
453 | if (deactivate) |
454 | a->container = NULL; | |
455 | ||
140d3685 | 456 | return dirty; |
549e9569 NB |
457 | } |
458 | ||
0af73f61 DW |
459 | static struct mdinfo * |
460 | find_device(struct active_array *a, int major, int minor) | |
461 | { | |
462 | struct mdinfo *mdi; | |
463 | ||
464 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) | |
465 | if (mdi->disk.major == major && mdi->disk.minor == minor) | |
466 | return mdi; | |
467 | ||
468 | return NULL; | |
469 | } | |
470 | ||
471 | static void reconcile_failed(struct active_array *aa, struct mdinfo *failed) | |
472 | { | |
473 | struct active_array *a; | |
474 | struct mdinfo *victim; | |
475 | ||
476 | for (a = aa; a; a = a->next) { | |
477 | if (!a->container) | |
478 | continue; | |
479 | victim = find_device(a, failed->disk.major, failed->disk.minor); | |
480 | if (!victim) | |
481 | continue; | |
482 | ||
483 | if (!(victim->curr_state & DS_FAULTY)) | |
484 | write_attr("faulty", victim->state_fd); | |
485 | } | |
486 | } | |
487 | ||
4e6e574a DW |
488 | #ifdef DEBUG |
489 | static void dprint_wake_reasons(fd_set *fds) | |
490 | { | |
491 | int i; | |
492 | char proc_path[256]; | |
493 | char link[256]; | |
494 | char *basename; | |
495 | int rv; | |
496 | ||
497 | fprintf(stderr, "monitor: wake ( "); | |
498 | for (i = 0; i < FD_SETSIZE; i++) { | |
499 | if (FD_ISSET(i, fds)) { | |
500 | sprintf(proc_path, "/proc/%d/fd/%d", | |
501 | (int) getpid(), i); | |
502 | ||
503 | rv = readlink(proc_path, link, sizeof(link) - 1); | |
504 | if (rv < 0) { | |
505 | fprintf(stderr, "%d:unknown ", i); | |
506 | continue; | |
507 | } | |
508 | link[rv] = '\0'; | |
509 | basename = strrchr(link, '/'); | |
510 | fprintf(stderr, "%d:%s ", | |
511 | i, basename ? ++basename : link); | |
512 | } | |
513 | } | |
514 | fprintf(stderr, ")\n"); | |
515 | } | |
516 | #endif | |
517 | ||
1eb252b8 N |
518 | int monitor_loop_cnt; |
519 | ||
4d43913c | 520 | static int wait_and_act(struct supertype *container, int nowait) |
549e9569 NB |
521 | { |
522 | fd_set rfds; | |
523 | int maxfd = 0; | |
e0d6609f | 524 | struct active_array **aap = &container->arrays; |
1ed3f387 | 525 | struct active_array *a, **ap; |
549e9569 | 526 | int rv; |
0af73f61 | 527 | struct mdinfo *mdi; |
6144ed44 | 528 | static unsigned int dirty_arrays = ~0; /* start at some non-zero value */ |
549e9569 NB |
529 | |
530 | FD_ZERO(&rfds); | |
531 | ||
1ed3f387 NB |
532 | for (ap = aap ; *ap ;) { |
533 | a = *ap; | |
534 | /* once an array has been deactivated we want to | |
535 | * ask the manager to discard it. | |
2a0bb19e | 536 | */ |
57f8c769 | 537 | if (!a->container || (a->info.array.level == 0)) { |
1ed3f387 NB |
538 | if (discard_this) { |
539 | ap = &(*ap)->next; | |
540 | continue; | |
541 | } | |
542 | *ap = a->next; | |
543 | a->next = NULL; | |
544 | discard_this = a; | |
545 | signal_manager(); | |
2a0bb19e | 546 | continue; |
1ed3f387 | 547 | } |
2a0bb19e | 548 | |
549e9569 NB |
549 | add_fd(&rfds, &maxfd, a->info.state_fd); |
550 | add_fd(&rfds, &maxfd, a->action_fd); | |
484240d8 | 551 | add_fd(&rfds, &maxfd, a->sync_completed_fd); |
549e9569 NB |
552 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) |
553 | add_fd(&rfds, &maxfd, mdi->state_fd); | |
1ed3f387 NB |
554 | |
555 | ap = &(*ap)->next; | |
549e9569 NB |
556 | } |
557 | ||
6144ed44 DW |
558 | if (manager_ready && (*aap == NULL || (sigterm && !dirty_arrays))) { |
559 | /* No interesting arrays, or we have been told to | |
560 | * terminate and everything is clean. Lets see about | |
561 | * exiting. Note that blocking at this point is not a | |
562 | * problem as there are no active arrays, there is | |
563 | * nothing that we need to be ready to do. | |
e0d6609f | 564 | */ |
e8a70c89 | 565 | int fd = open_dev_excl(container->devnum); |
e0d6609f NB |
566 | if (fd >= 0 || errno != EBUSY) { |
567 | /* OK, we are safe to leave */ | |
6144ed44 DW |
568 | if (sigterm && !dirty_arrays) |
569 | dprintf("caught sigterm, all clean... exiting\n"); | |
570 | else | |
571 | dprintf("no arrays to monitor... exiting\n"); | |
fa716c83 N |
572 | if (!sigterm) |
573 | /* On SIGTERM, someone (the take-over mdmon) will | |
574 | * clean up | |
575 | */ | |
576 | remove_pidfile(container->devname); | |
e0d6609f NB |
577 | exit_now = 1; |
578 | signal_manager(); | |
6f4cdfd9 | 579 | close(fd); |
e0d6609f NB |
580 | exit(0); |
581 | } | |
582 | } | |
583 | ||
549e9569 | 584 | if (!nowait) { |
4d43913c NB |
585 | sigset_t set; |
586 | sigprocmask(SIG_UNBLOCK, NULL, &set); | |
587 | sigdelset(&set, SIGUSR1); | |
1eb252b8 | 588 | monitor_loop_cnt |= 1; |
28005287 | 589 | rv = pselect(maxfd+1, NULL, NULL, &rfds, NULL, &set); |
1eb252b8 | 590 | monitor_loop_cnt += 1; |
bfa44e2e NB |
591 | if (rv == -1 && errno == EINTR) |
592 | rv = 0; | |
4e6e574a DW |
593 | #ifdef DEBUG |
594 | dprint_wake_reasons(&rfds); | |
595 | #endif | |
596 | ||
549e9569 NB |
597 | } |
598 | ||
2e735d19 NB |
599 | if (update_queue) { |
600 | struct metadata_update *this; | |
601 | ||
602 | for (this = update_queue; this ; this = this->next) | |
603 | container->ss->process_update(container, this); | |
604 | ||
605 | update_queue_handled = update_queue; | |
606 | update_queue = NULL; | |
607 | signal_manager(); | |
608 | container->ss->sync_metadata(container); | |
609 | } | |
610 | ||
3d2c4fc7 | 611 | rv = 0; |
6144ed44 | 612 | dirty_arrays = 0; |
1ed3f387 | 613 | for (a = *aap; a ; a = a->next) { |
6144ed44 DW |
614 | int is_dirty; |
615 | ||
2a0bb19e | 616 | if (a->replaces && !discard_this) { |
549e9569 NB |
617 | struct active_array **ap; |
618 | for (ap = &a->next; *ap && *ap != a->replaces; | |
619 | ap = & (*ap)->next) | |
620 | ; | |
621 | if (*ap) | |
622 | *ap = (*ap)->next; | |
623 | discard_this = a->replaces; | |
624 | a->replaces = NULL; | |
6c3fb95c | 625 | /* FIXME check if device->state_fd need to be cleared?*/ |
1ed3f387 | 626 | signal_manager(); |
549e9569 | 627 | } |
140d3685 DW |
628 | if (a->container) { |
629 | is_dirty = read_and_act(a); | |
630 | rv |= 1; | |
631 | dirty_arrays += is_dirty; | |
632 | /* when terminating stop manipulating the array after it | |
633 | * is clean, but make sure read_and_act() is given a | |
634 | * chance to handle 'active_idle' | |
635 | */ | |
636 | if (sigterm && !is_dirty) | |
637 | a->container = NULL; /* stop touching this array */ | |
6144ed44 | 638 | } |
549e9569 | 639 | } |
0af73f61 DW |
640 | |
641 | /* propagate failures across container members */ | |
1ed3f387 | 642 | for (a = *aap; a ; a = a->next) { |
0af73f61 DW |
643 | if (!a->container) |
644 | continue; | |
645 | for (mdi = a->info.devs ; mdi ; mdi = mdi->next) | |
646 | if (mdi->curr_state & DS_FAULTY) | |
1ed3f387 | 647 | reconcile_failed(*aap, mdi); |
0af73f61 DW |
648 | } |
649 | ||
549e9569 NB |
650 | return rv; |
651 | } | |
652 | ||
653 | void do_monitor(struct supertype *container) | |
654 | { | |
655 | int rv; | |
656 | int first = 1; | |
657 | do { | |
4d43913c | 658 | rv = wait_and_act(container, first); |
549e9569 NB |
659 | first = 0; |
660 | } while (rv >= 0); | |
661 | } |