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33e9e9bd KW |
1 | /* |
2 | * Background jobs (long-running operations) | |
3 | * | |
4 | * Copyright (c) 2011 IBM Corp. | |
5 | * Copyright (c) 2012, 2018 Red Hat, Inc. | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
25 | ||
26 | #include "qemu/osdep.h" | |
27 | #include "qemu-common.h" | |
28 | #include "qapi/error.h" | |
29 | #include "qemu/job.h" | |
30 | #include "qemu/id.h" | |
1908a559 | 31 | #include "qemu/main-loop.h" |
a50c2ab8 | 32 | #include "trace-root.h" |
1dac83f1 | 33 | #include "qapi/qapi-events-job.h" |
33e9e9bd | 34 | |
e7c1d78b KW |
35 | static QLIST_HEAD(, Job) jobs = QLIST_HEAD_INITIALIZER(jobs); |
36 | ||
a50c2ab8 KW |
37 | /* Job State Transition Table */ |
38 | bool JobSTT[JOB_STATUS__MAX][JOB_STATUS__MAX] = { | |
39 | /* U, C, R, P, Y, S, W, D, X, E, N */ | |
40 | /* U: */ [JOB_STATUS_UNDEFINED] = {0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, | |
41 | /* C: */ [JOB_STATUS_CREATED] = {0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1}, | |
42 | /* R: */ [JOB_STATUS_RUNNING] = {0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0}, | |
43 | /* P: */ [JOB_STATUS_PAUSED] = {0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0}, | |
44 | /* Y: */ [JOB_STATUS_READY] = {0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0}, | |
45 | /* S: */ [JOB_STATUS_STANDBY] = {0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0}, | |
46 | /* W: */ [JOB_STATUS_WAITING] = {0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0}, | |
47 | /* D: */ [JOB_STATUS_PENDING] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0}, | |
48 | /* X: */ [JOB_STATUS_ABORTING] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0}, | |
49 | /* E: */ [JOB_STATUS_CONCLUDED] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, | |
50 | /* N: */ [JOB_STATUS_NULL] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, | |
51 | }; | |
52 | ||
53 | bool JobVerbTable[JOB_VERB__MAX][JOB_STATUS__MAX] = { | |
54 | /* U, C, R, P, Y, S, W, D, X, E, N */ | |
55 | [JOB_VERB_CANCEL] = {0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0}, | |
56 | [JOB_VERB_PAUSE] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0}, | |
57 | [JOB_VERB_RESUME] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0}, | |
58 | [JOB_VERB_SET_SPEED] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0}, | |
59 | [JOB_VERB_COMPLETE] = {0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0}, | |
60 | [JOB_VERB_FINALIZE] = {0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0}, | |
61 | [JOB_VERB_DISMISS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0}, | |
62 | }; | |
63 | ||
7eaa8fb5 KW |
64 | /* Transactional group of jobs */ |
65 | struct JobTxn { | |
66 | ||
67 | /* Is this txn being cancelled? */ | |
68 | bool aborting; | |
69 | ||
70 | /* List of jobs */ | |
71 | QLIST_HEAD(, Job) jobs; | |
72 | ||
73 | /* Reference count */ | |
74 | int refcnt; | |
75 | }; | |
76 | ||
da01ff7f KW |
77 | /* Right now, this mutex is only needed to synchronize accesses to job->busy |
78 | * and job->sleep_timer, such as concurrent calls to job_do_yield and | |
79 | * job_enter. */ | |
80 | static QemuMutex job_mutex; | |
81 | ||
82 | static void job_lock(void) | |
83 | { | |
84 | qemu_mutex_lock(&job_mutex); | |
85 | } | |
86 | ||
87 | static void job_unlock(void) | |
88 | { | |
89 | qemu_mutex_unlock(&job_mutex); | |
90 | } | |
91 | ||
92 | static void __attribute__((__constructor__)) job_init(void) | |
93 | { | |
94 | qemu_mutex_init(&job_mutex); | |
95 | } | |
96 | ||
7eaa8fb5 KW |
97 | JobTxn *job_txn_new(void) |
98 | { | |
99 | JobTxn *txn = g_new0(JobTxn, 1); | |
100 | QLIST_INIT(&txn->jobs); | |
101 | txn->refcnt = 1; | |
102 | return txn; | |
103 | } | |
104 | ||
105 | static void job_txn_ref(JobTxn *txn) | |
106 | { | |
107 | txn->refcnt++; | |
108 | } | |
109 | ||
110 | void job_txn_unref(JobTxn *txn) | |
111 | { | |
112 | if (txn && --txn->refcnt == 0) { | |
113 | g_free(txn); | |
114 | } | |
115 | } | |
116 | ||
117 | void job_txn_add_job(JobTxn *txn, Job *job) | |
118 | { | |
119 | if (!txn) { | |
120 | return; | |
121 | } | |
122 | ||
123 | assert(!job->txn); | |
124 | job->txn = txn; | |
125 | ||
126 | QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); | |
127 | job_txn_ref(txn); | |
128 | } | |
129 | ||
130 | static void job_txn_del_job(Job *job) | |
131 | { | |
132 | if (job->txn) { | |
133 | QLIST_REMOVE(job, txn_list); | |
134 | job_txn_unref(job->txn); | |
135 | job->txn = NULL; | |
136 | } | |
137 | } | |
138 | ||
139 | static int job_txn_apply(JobTxn *txn, int fn(Job *), bool lock) | |
140 | { | |
141 | AioContext *ctx; | |
142 | Job *job, *next; | |
143 | int rc = 0; | |
144 | ||
145 | QLIST_FOREACH_SAFE(job, &txn->jobs, txn_list, next) { | |
146 | if (lock) { | |
147 | ctx = job->aio_context; | |
148 | aio_context_acquire(ctx); | |
149 | } | |
150 | rc = fn(job); | |
151 | if (lock) { | |
152 | aio_context_release(ctx); | |
153 | } | |
154 | if (rc) { | |
155 | break; | |
156 | } | |
157 | } | |
158 | return rc; | |
159 | } | |
160 | ||
456273b0 | 161 | bool job_is_internal(Job *job) |
1dac83f1 KW |
162 | { |
163 | return (job->id == NULL); | |
164 | } | |
165 | ||
2e1795b5 | 166 | static void job_state_transition(Job *job, JobStatus s1) |
a50c2ab8 KW |
167 | { |
168 | JobStatus s0 = job->status; | |
169 | assert(s1 >= 0 && s1 <= JOB_STATUS__MAX); | |
4ad35181 | 170 | trace_job_state_transition(job, job->ret, |
a50c2ab8 KW |
171 | JobSTT[s0][s1] ? "allowed" : "disallowed", |
172 | JobStatus_str(s0), JobStatus_str(s1)); | |
173 | assert(JobSTT[s0][s1]); | |
174 | job->status = s1; | |
1dac83f1 KW |
175 | |
176 | if (!job_is_internal(job) && s1 != s0) { | |
177 | qapi_event_send_job_status_change(job->id, job->status, &error_abort); | |
178 | } | |
a50c2ab8 KW |
179 | } |
180 | ||
181 | int job_apply_verb(Job *job, JobVerb verb, Error **errp) | |
182 | { | |
183 | JobStatus s0 = job->status; | |
184 | assert(verb >= 0 && verb <= JOB_VERB__MAX); | |
185 | trace_job_apply_verb(job, JobStatus_str(s0), JobVerb_str(verb), | |
186 | JobVerbTable[verb][s0] ? "allowed" : "prohibited"); | |
187 | if (JobVerbTable[verb][s0]) { | |
188 | return 0; | |
189 | } | |
190 | error_setg(errp, "Job '%s' in state '%s' cannot accept command verb '%s'", | |
191 | job->id, JobStatus_str(s0), JobVerb_str(verb)); | |
192 | return -EPERM; | |
193 | } | |
194 | ||
252291ea KW |
195 | JobType job_type(const Job *job) |
196 | { | |
197 | return job->driver->job_type; | |
198 | } | |
199 | ||
200 | const char *job_type_str(const Job *job) | |
201 | { | |
202 | return JobType_str(job_type(job)); | |
203 | } | |
204 | ||
daa7f2f9 KW |
205 | bool job_is_cancelled(Job *job) |
206 | { | |
207 | return job->cancelled; | |
208 | } | |
209 | ||
df956ae2 KW |
210 | bool job_is_ready(Job *job) |
211 | { | |
212 | switch (job->status) { | |
213 | case JOB_STATUS_UNDEFINED: | |
214 | case JOB_STATUS_CREATED: | |
215 | case JOB_STATUS_RUNNING: | |
216 | case JOB_STATUS_PAUSED: | |
217 | case JOB_STATUS_WAITING: | |
218 | case JOB_STATUS_PENDING: | |
219 | case JOB_STATUS_ABORTING: | |
220 | case JOB_STATUS_CONCLUDED: | |
221 | case JOB_STATUS_NULL: | |
222 | return false; | |
223 | case JOB_STATUS_READY: | |
224 | case JOB_STATUS_STANDBY: | |
225 | return true; | |
226 | default: | |
227 | g_assert_not_reached(); | |
228 | } | |
229 | return false; | |
230 | } | |
231 | ||
dbe5e6c1 KW |
232 | bool job_is_completed(Job *job) |
233 | { | |
234 | switch (job->status) { | |
235 | case JOB_STATUS_UNDEFINED: | |
236 | case JOB_STATUS_CREATED: | |
237 | case JOB_STATUS_RUNNING: | |
238 | case JOB_STATUS_PAUSED: | |
239 | case JOB_STATUS_READY: | |
240 | case JOB_STATUS_STANDBY: | |
241 | return false; | |
242 | case JOB_STATUS_WAITING: | |
243 | case JOB_STATUS_PENDING: | |
244 | case JOB_STATUS_ABORTING: | |
245 | case JOB_STATUS_CONCLUDED: | |
246 | case JOB_STATUS_NULL: | |
247 | return true; | |
248 | default: | |
249 | g_assert_not_reached(); | |
250 | } | |
251 | return false; | |
252 | } | |
253 | ||
3d70ff53 | 254 | static bool job_started(Job *job) |
da01ff7f KW |
255 | { |
256 | return job->co; | |
257 | } | |
258 | ||
198c49cc | 259 | static bool job_should_pause(Job *job) |
da01ff7f KW |
260 | { |
261 | return job->pause_count > 0; | |
262 | } | |
263 | ||
e7c1d78b KW |
264 | Job *job_next(Job *job) |
265 | { | |
266 | if (!job) { | |
267 | return QLIST_FIRST(&jobs); | |
268 | } | |
269 | return QLIST_NEXT(job, job_list); | |
270 | } | |
271 | ||
272 | Job *job_get(const char *id) | |
273 | { | |
274 | Job *job; | |
275 | ||
276 | QLIST_FOREACH(job, &jobs, job_list) { | |
277 | if (job->id && !strcmp(id, job->id)) { | |
278 | return job; | |
279 | } | |
280 | } | |
281 | ||
282 | return NULL; | |
283 | } | |
284 | ||
5d43e86e KW |
285 | static void job_sleep_timer_cb(void *opaque) |
286 | { | |
287 | Job *job = opaque; | |
288 | ||
289 | job_enter(job); | |
290 | } | |
291 | ||
7eaa8fb5 KW |
292 | void *job_create(const char *job_id, const JobDriver *driver, JobTxn *txn, |
293 | AioContext *ctx, int flags, BlockCompletionFunc *cb, | |
294 | void *opaque, Error **errp) | |
33e9e9bd KW |
295 | { |
296 | Job *job; | |
297 | ||
298 | if (job_id) { | |
bb02b65c KW |
299 | if (flags & JOB_INTERNAL) { |
300 | error_setg(errp, "Cannot specify job ID for internal job"); | |
301 | return NULL; | |
302 | } | |
33e9e9bd KW |
303 | if (!id_wellformed(job_id)) { |
304 | error_setg(errp, "Invalid job ID '%s'", job_id); | |
305 | return NULL; | |
306 | } | |
e7c1d78b KW |
307 | if (job_get(job_id)) { |
308 | error_setg(errp, "Job ID '%s' already in use", job_id); | |
309 | return NULL; | |
310 | } | |
bb02b65c KW |
311 | } else if (!(flags & JOB_INTERNAL)) { |
312 | error_setg(errp, "An explicit job ID is required"); | |
313 | return NULL; | |
33e9e9bd KW |
314 | } |
315 | ||
316 | job = g_malloc0(driver->instance_size); | |
317 | job->driver = driver; | |
318 | job->id = g_strdup(job_id); | |
80fa2c75 | 319 | job->refcnt = 1; |
08be6fe2 | 320 | job->aio_context = ctx; |
da01ff7f KW |
321 | job->busy = false; |
322 | job->paused = true; | |
323 | job->pause_count = 1; | |
bb02b65c KW |
324 | job->auto_finalize = !(flags & JOB_MANUAL_FINALIZE); |
325 | job->auto_dismiss = !(flags & JOB_MANUAL_DISMISS); | |
4ad35181 KW |
326 | job->cb = cb; |
327 | job->opaque = opaque; | |
33e9e9bd | 328 | |
139a9f02 KW |
329 | notifier_list_init(&job->on_finalize_cancelled); |
330 | notifier_list_init(&job->on_finalize_completed); | |
331 | notifier_list_init(&job->on_pending); | |
2e1795b5 | 332 | notifier_list_init(&job->on_ready); |
139a9f02 | 333 | |
a50c2ab8 | 334 | job_state_transition(job, JOB_STATUS_CREATED); |
5d43e86e KW |
335 | aio_timer_init(qemu_get_aio_context(), &job->sleep_timer, |
336 | QEMU_CLOCK_REALTIME, SCALE_NS, | |
337 | job_sleep_timer_cb, job); | |
a50c2ab8 | 338 | |
e7c1d78b KW |
339 | QLIST_INSERT_HEAD(&jobs, job, job_list); |
340 | ||
7eaa8fb5 KW |
341 | /* Single jobs are modeled as single-job transactions for sake of |
342 | * consolidating the job management logic */ | |
343 | if (!txn) { | |
344 | txn = job_txn_new(); | |
345 | job_txn_add_job(txn, job); | |
346 | job_txn_unref(txn); | |
347 | } else { | |
348 | job_txn_add_job(txn, job); | |
349 | } | |
350 | ||
33e9e9bd KW |
351 | return job; |
352 | } | |
fd61a701 | 353 | |
80fa2c75 | 354 | void job_ref(Job *job) |
fd61a701 | 355 | { |
80fa2c75 KW |
356 | ++job->refcnt; |
357 | } | |
358 | ||
359 | void job_unref(Job *job) | |
360 | { | |
361 | if (--job->refcnt == 0) { | |
362 | assert(job->status == JOB_STATUS_NULL); | |
5d43e86e | 363 | assert(!timer_pending(&job->sleep_timer)); |
7eaa8fb5 | 364 | assert(!job->txn); |
e7c1d78b | 365 | |
80fa2c75 KW |
366 | if (job->driver->free) { |
367 | job->driver->free(job); | |
368 | } | |
369 | ||
370 | QLIST_REMOVE(job, job_list); | |
371 | ||
372 | g_free(job->id); | |
373 | g_free(job); | |
374 | } | |
fd61a701 | 375 | } |
1908a559 | 376 | |
30a5c887 KW |
377 | void job_progress_update(Job *job, uint64_t done) |
378 | { | |
379 | job->progress_current += done; | |
380 | } | |
381 | ||
382 | void job_progress_set_remaining(Job *job, uint64_t remaining) | |
383 | { | |
384 | job->progress_total = job->progress_current + remaining; | |
385 | } | |
386 | ||
139a9f02 KW |
387 | void job_event_cancelled(Job *job) |
388 | { | |
389 | notifier_list_notify(&job->on_finalize_cancelled, job); | |
390 | } | |
391 | ||
392 | void job_event_completed(Job *job) | |
393 | { | |
394 | notifier_list_notify(&job->on_finalize_completed, job); | |
395 | } | |
396 | ||
7eaa8fb5 | 397 | static void job_event_pending(Job *job) |
139a9f02 KW |
398 | { |
399 | notifier_list_notify(&job->on_pending, job); | |
400 | } | |
401 | ||
2e1795b5 KW |
402 | static void job_event_ready(Job *job) |
403 | { | |
404 | notifier_list_notify(&job->on_ready, job); | |
405 | } | |
406 | ||
da01ff7f KW |
407 | void job_enter_cond(Job *job, bool(*fn)(Job *job)) |
408 | { | |
409 | if (!job_started(job)) { | |
410 | return; | |
411 | } | |
412 | if (job->deferred_to_main_loop) { | |
413 | return; | |
414 | } | |
415 | ||
416 | job_lock(); | |
417 | if (job->busy) { | |
418 | job_unlock(); | |
419 | return; | |
420 | } | |
421 | ||
422 | if (fn && !fn(job)) { | |
423 | job_unlock(); | |
424 | return; | |
425 | } | |
426 | ||
427 | assert(!job->deferred_to_main_loop); | |
428 | timer_del(&job->sleep_timer); | |
429 | job->busy = true; | |
430 | job_unlock(); | |
431 | aio_co_wake(job->co); | |
432 | } | |
433 | ||
5d43e86e KW |
434 | void job_enter(Job *job) |
435 | { | |
436 | job_enter_cond(job, NULL); | |
437 | } | |
438 | ||
da01ff7f | 439 | /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds. |
3d70ff53 KW |
440 | * Reentering the job coroutine with job_enter() before the timer has expired |
441 | * is allowed and cancels the timer. | |
da01ff7f | 442 | * |
3d70ff53 | 443 | * If @ns is (uint64_t) -1, no timer is scheduled and job_enter() must be |
da01ff7f | 444 | * called explicitly. */ |
198c49cc | 445 | static void coroutine_fn job_do_yield(Job *job, uint64_t ns) |
da01ff7f KW |
446 | { |
447 | job_lock(); | |
448 | if (ns != -1) { | |
449 | timer_mod(&job->sleep_timer, ns); | |
450 | } | |
451 | job->busy = false; | |
452 | job_unlock(); | |
453 | qemu_coroutine_yield(); | |
454 | ||
455 | /* Set by job_enter_cond() before re-entering the coroutine. */ | |
456 | assert(job->busy); | |
457 | } | |
458 | ||
459 | void coroutine_fn job_pause_point(Job *job) | |
460 | { | |
461 | assert(job && job_started(job)); | |
462 | ||
463 | if (!job_should_pause(job)) { | |
464 | return; | |
465 | } | |
466 | if (job_is_cancelled(job)) { | |
467 | return; | |
468 | } | |
469 | ||
470 | if (job->driver->pause) { | |
471 | job->driver->pause(job); | |
472 | } | |
473 | ||
474 | if (job_should_pause(job) && !job_is_cancelled(job)) { | |
475 | JobStatus status = job->status; | |
476 | job_state_transition(job, status == JOB_STATUS_READY | |
477 | ? JOB_STATUS_STANDBY | |
478 | : JOB_STATUS_PAUSED); | |
479 | job->paused = true; | |
480 | job_do_yield(job, -1); | |
481 | job->paused = false; | |
482 | job_state_transition(job, status); | |
483 | } | |
484 | ||
485 | if (job->driver->resume) { | |
486 | job->driver->resume(job); | |
487 | } | |
488 | } | |
489 | ||
198c49cc KW |
490 | void job_yield(Job *job) |
491 | { | |
492 | assert(job->busy); | |
493 | ||
494 | /* Check cancellation *before* setting busy = false, too! */ | |
495 | if (job_is_cancelled(job)) { | |
496 | return; | |
497 | } | |
498 | ||
499 | if (!job_should_pause(job)) { | |
500 | job_do_yield(job, -1); | |
501 | } | |
502 | ||
503 | job_pause_point(job); | |
504 | } | |
505 | ||
5d43e86e KW |
506 | void coroutine_fn job_sleep_ns(Job *job, int64_t ns) |
507 | { | |
508 | assert(job->busy); | |
509 | ||
510 | /* Check cancellation *before* setting busy = false, too! */ | |
511 | if (job_is_cancelled(job)) { | |
512 | return; | |
513 | } | |
514 | ||
515 | if (!job_should_pause(job)) { | |
516 | job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns); | |
517 | } | |
518 | ||
519 | job_pause_point(job); | |
520 | } | |
521 | ||
b69f777d KW |
522 | void job_drain(Job *job) |
523 | { | |
524 | /* If job is !busy this kicks it into the next pause point. */ | |
525 | job_enter(job); | |
526 | ||
527 | if (job->driver->drain) { | |
528 | job->driver->drain(job); | |
529 | } | |
530 | } | |
531 | ||
532 | ||
da01ff7f KW |
533 | /** |
534 | * All jobs must allow a pause point before entering their job proper. This | |
535 | * ensures that jobs can be paused prior to being started, then resumed later. | |
536 | */ | |
537 | static void coroutine_fn job_co_entry(void *opaque) | |
538 | { | |
539 | Job *job = opaque; | |
540 | ||
541 | assert(job && job->driver && job->driver->start); | |
542 | job_pause_point(job); | |
543 | job->driver->start(job); | |
544 | } | |
545 | ||
546 | ||
547 | void job_start(Job *job) | |
548 | { | |
549 | assert(job && !job_started(job) && job->paused && | |
550 | job->driver && job->driver->start); | |
551 | job->co = qemu_coroutine_create(job_co_entry, job); | |
552 | job->pause_count--; | |
553 | job->busy = true; | |
554 | job->paused = false; | |
555 | job_state_transition(job, JOB_STATUS_RUNNING); | |
556 | aio_co_enter(job->aio_context, job->co); | |
557 | } | |
558 | ||
b15de828 KW |
559 | /* Assumes the block_job_mutex is held */ |
560 | static bool job_timer_not_pending(Job *job) | |
561 | { | |
562 | return !timer_pending(&job->sleep_timer); | |
563 | } | |
564 | ||
565 | void job_pause(Job *job) | |
566 | { | |
567 | job->pause_count++; | |
568 | } | |
569 | ||
570 | void job_resume(Job *job) | |
571 | { | |
572 | assert(job->pause_count > 0); | |
573 | job->pause_count--; | |
574 | if (job->pause_count) { | |
575 | return; | |
576 | } | |
577 | ||
578 | /* kick only if no timer is pending */ | |
579 | job_enter_cond(job, job_timer_not_pending); | |
580 | } | |
581 | ||
582 | void job_user_pause(Job *job, Error **errp) | |
583 | { | |
584 | if (job_apply_verb(job, JOB_VERB_PAUSE, errp)) { | |
585 | return; | |
586 | } | |
587 | if (job->user_paused) { | |
588 | error_setg(errp, "Job is already paused"); | |
589 | return; | |
590 | } | |
591 | job->user_paused = true; | |
592 | job_pause(job); | |
593 | } | |
594 | ||
595 | bool job_user_paused(Job *job) | |
596 | { | |
597 | return job->user_paused; | |
598 | } | |
599 | ||
600 | void job_user_resume(Job *job, Error **errp) | |
601 | { | |
602 | assert(job); | |
603 | if (!job->user_paused || job->pause_count <= 0) { | |
604 | error_setg(errp, "Can't resume a job that was not paused"); | |
605 | return; | |
606 | } | |
607 | if (job_apply_verb(job, JOB_VERB_RESUME, errp)) { | |
608 | return; | |
609 | } | |
610 | if (job->driver->user_resume) { | |
611 | job->driver->user_resume(job); | |
612 | } | |
613 | job->user_paused = false; | |
614 | job_resume(job); | |
615 | } | |
616 | ||
5f9a6a08 | 617 | static void job_do_dismiss(Job *job) |
4ad35181 KW |
618 | { |
619 | assert(job); | |
620 | job->busy = false; | |
621 | job->paused = false; | |
622 | job->deferred_to_main_loop = true; | |
623 | ||
7eaa8fb5 | 624 | job_txn_del_job(job); |
4ad35181 KW |
625 | |
626 | job_state_transition(job, JOB_STATUS_NULL); | |
627 | job_unref(job); | |
628 | } | |
629 | ||
5f9a6a08 KW |
630 | void job_dismiss(Job **jobptr, Error **errp) |
631 | { | |
632 | Job *job = *jobptr; | |
633 | /* similarly to _complete, this is QMP-interface only. */ | |
634 | assert(job->id); | |
635 | if (job_apply_verb(job, JOB_VERB_DISMISS, errp)) { | |
636 | return; | |
637 | } | |
638 | ||
639 | job_do_dismiss(job); | |
640 | *jobptr = NULL; | |
641 | } | |
642 | ||
4ad35181 KW |
643 | void job_early_fail(Job *job) |
644 | { | |
645 | assert(job->status == JOB_STATUS_CREATED); | |
646 | job_do_dismiss(job); | |
647 | } | |
648 | ||
649 | static void job_conclude(Job *job) | |
650 | { | |
651 | job_state_transition(job, JOB_STATUS_CONCLUDED); | |
652 | if (job->auto_dismiss || !job_started(job)) { | |
653 | job_do_dismiss(job); | |
654 | } | |
655 | } | |
656 | ||
3d70ff53 | 657 | static void job_update_rc(Job *job) |
4ad35181 KW |
658 | { |
659 | if (!job->ret && job_is_cancelled(job)) { | |
660 | job->ret = -ECANCELED; | |
661 | } | |
662 | if (job->ret) { | |
663 | job_state_transition(job, JOB_STATUS_ABORTING); | |
664 | } | |
665 | } | |
666 | ||
667 | static void job_commit(Job *job) | |
668 | { | |
669 | assert(!job->ret); | |
670 | if (job->driver->commit) { | |
671 | job->driver->commit(job); | |
672 | } | |
673 | } | |
674 | ||
675 | static void job_abort(Job *job) | |
676 | { | |
677 | assert(job->ret); | |
678 | if (job->driver->abort) { | |
679 | job->driver->abort(job); | |
680 | } | |
681 | } | |
682 | ||
683 | static void job_clean(Job *job) | |
684 | { | |
685 | if (job->driver->clean) { | |
686 | job->driver->clean(job); | |
687 | } | |
688 | } | |
689 | ||
7eaa8fb5 | 690 | static int job_finalize_single(Job *job) |
4ad35181 KW |
691 | { |
692 | assert(job_is_completed(job)); | |
693 | ||
694 | /* Ensure abort is called for late-transactional failures */ | |
695 | job_update_rc(job); | |
696 | ||
697 | if (!job->ret) { | |
698 | job_commit(job); | |
699 | } else { | |
700 | job_abort(job); | |
701 | } | |
702 | job_clean(job); | |
703 | ||
704 | if (job->cb) { | |
705 | job->cb(job->opaque, job->ret); | |
706 | } | |
707 | ||
708 | /* Emit events only if we actually started */ | |
709 | if (job_started(job)) { | |
710 | if (job_is_cancelled(job)) { | |
711 | job_event_cancelled(job); | |
712 | } else { | |
713 | job_event_completed(job); | |
714 | } | |
715 | } | |
716 | ||
7eaa8fb5 | 717 | job_txn_del_job(job); |
4ad35181 KW |
718 | job_conclude(job); |
719 | return 0; | |
720 | } | |
721 | ||
3d70ff53 | 722 | static void job_cancel_async(Job *job, bool force) |
7eaa8fb5 KW |
723 | { |
724 | if (job->user_paused) { | |
725 | /* Do not call job_enter here, the caller will handle it. */ | |
726 | job->user_paused = false; | |
727 | if (job->driver->user_resume) { | |
728 | job->driver->user_resume(job); | |
729 | } | |
730 | assert(job->pause_count > 0); | |
731 | job->pause_count--; | |
732 | } | |
733 | job->cancelled = true; | |
734 | /* To prevent 'force == false' overriding a previous 'force == true' */ | |
735 | job->force_cancel |= force; | |
736 | } | |
737 | ||
3d70ff53 | 738 | static void job_completed_txn_abort(Job *job) |
7eaa8fb5 KW |
739 | { |
740 | AioContext *ctx; | |
741 | JobTxn *txn = job->txn; | |
742 | Job *other_job; | |
743 | ||
744 | if (txn->aborting) { | |
745 | /* | |
746 | * We are cancelled by another job, which will handle everything. | |
747 | */ | |
748 | return; | |
749 | } | |
750 | txn->aborting = true; | |
751 | job_txn_ref(txn); | |
752 | ||
753 | /* We are the first failed job. Cancel other jobs. */ | |
754 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
755 | ctx = other_job->aio_context; | |
756 | aio_context_acquire(ctx); | |
757 | } | |
758 | ||
759 | /* Other jobs are effectively cancelled by us, set the status for | |
760 | * them; this job, however, may or may not be cancelled, depending | |
761 | * on the caller, so leave it. */ | |
762 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
763 | if (other_job != job) { | |
764 | job_cancel_async(other_job, false); | |
765 | } | |
766 | } | |
767 | while (!QLIST_EMPTY(&txn->jobs)) { | |
768 | other_job = QLIST_FIRST(&txn->jobs); | |
769 | ctx = other_job->aio_context; | |
770 | if (!job_is_completed(other_job)) { | |
771 | assert(job_is_cancelled(other_job)); | |
772 | job_finish_sync(other_job, NULL, NULL); | |
773 | } | |
774 | job_finalize_single(other_job); | |
775 | aio_context_release(ctx); | |
776 | } | |
777 | ||
778 | job_txn_unref(txn); | |
779 | } | |
780 | ||
781 | static int job_prepare(Job *job) | |
782 | { | |
783 | if (job->ret == 0 && job->driver->prepare) { | |
784 | job->ret = job->driver->prepare(job); | |
785 | } | |
786 | return job->ret; | |
787 | } | |
788 | ||
789 | static int job_needs_finalize(Job *job) | |
790 | { | |
791 | return !job->auto_finalize; | |
792 | } | |
793 | ||
794 | static void job_do_finalize(Job *job) | |
795 | { | |
796 | int rc; | |
797 | assert(job && job->txn); | |
798 | ||
799 | /* prepare the transaction to complete */ | |
800 | rc = job_txn_apply(job->txn, job_prepare, true); | |
801 | if (rc) { | |
802 | job_completed_txn_abort(job); | |
803 | } else { | |
804 | job_txn_apply(job->txn, job_finalize_single, true); | |
805 | } | |
806 | } | |
807 | ||
808 | void job_finalize(Job *job, Error **errp) | |
809 | { | |
810 | assert(job && job->id); | |
811 | if (job_apply_verb(job, JOB_VERB_FINALIZE, errp)) { | |
812 | return; | |
813 | } | |
814 | job_do_finalize(job); | |
815 | } | |
816 | ||
817 | static int job_transition_to_pending(Job *job) | |
818 | { | |
819 | job_state_transition(job, JOB_STATUS_PENDING); | |
820 | if (!job->auto_finalize) { | |
821 | job_event_pending(job); | |
822 | } | |
823 | return 0; | |
824 | } | |
825 | ||
2e1795b5 KW |
826 | void job_transition_to_ready(Job *job) |
827 | { | |
828 | job_state_transition(job, JOB_STATUS_READY); | |
829 | job_event_ready(job); | |
830 | } | |
831 | ||
3d70ff53 | 832 | static void job_completed_txn_success(Job *job) |
7eaa8fb5 KW |
833 | { |
834 | JobTxn *txn = job->txn; | |
835 | Job *other_job; | |
836 | ||
837 | job_state_transition(job, JOB_STATUS_WAITING); | |
838 | ||
839 | /* | |
840 | * Successful completion, see if there are other running jobs in this | |
841 | * txn. | |
842 | */ | |
843 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
844 | if (!job_is_completed(other_job)) { | |
845 | return; | |
846 | } | |
847 | assert(other_job->ret == 0); | |
848 | } | |
849 | ||
850 | job_txn_apply(txn, job_transition_to_pending, false); | |
851 | ||
852 | /* If no jobs need manual finalization, automatically do so */ | |
853 | if (job_txn_apply(txn, job_needs_finalize, false) == 0) { | |
854 | job_do_finalize(job); | |
855 | } | |
856 | } | |
857 | ||
3d70ff53 KW |
858 | void job_completed(Job *job, int ret) |
859 | { | |
860 | assert(job && job->txn && !job_is_completed(job)); | |
861 | job->ret = ret; | |
862 | job_update_rc(job); | |
863 | trace_job_completed(job, ret, job->ret); | |
864 | if (job->ret) { | |
865 | job_completed_txn_abort(job); | |
866 | } else { | |
867 | job_completed_txn_success(job); | |
868 | } | |
869 | } | |
870 | ||
871 | void job_cancel(Job *job, bool force) | |
872 | { | |
873 | if (job->status == JOB_STATUS_CONCLUDED) { | |
874 | job_do_dismiss(job); | |
875 | return; | |
876 | } | |
877 | job_cancel_async(job, force); | |
878 | if (!job_started(job)) { | |
879 | job_completed(job, -ECANCELED); | |
880 | } else if (job->deferred_to_main_loop) { | |
881 | job_completed_txn_abort(job); | |
882 | } else { | |
883 | job_enter(job); | |
884 | } | |
885 | } | |
886 | ||
887 | void job_user_cancel(Job *job, bool force, Error **errp) | |
888 | { | |
889 | if (job_apply_verb(job, JOB_VERB_CANCEL, errp)) { | |
890 | return; | |
891 | } | |
892 | job_cancel(job, force); | |
893 | } | |
894 | ||
895 | /* A wrapper around job_cancel() taking an Error ** parameter so it may be | |
896 | * used with job_finish_sync() without the need for (rather nasty) function | |
897 | * pointer casts there. */ | |
898 | static void job_cancel_err(Job *job, Error **errp) | |
899 | { | |
900 | job_cancel(job, false); | |
901 | } | |
902 | ||
903 | int job_cancel_sync(Job *job) | |
904 | { | |
905 | return job_finish_sync(job, &job_cancel_err, NULL); | |
906 | } | |
907 | ||
908 | void job_cancel_sync_all(void) | |
909 | { | |
910 | Job *job; | |
911 | AioContext *aio_context; | |
912 | ||
913 | while ((job = job_next(NULL))) { | |
914 | aio_context = job->aio_context; | |
915 | aio_context_acquire(aio_context); | |
916 | job_cancel_sync(job); | |
917 | aio_context_release(aio_context); | |
918 | } | |
919 | } | |
920 | ||
921 | int job_complete_sync(Job *job, Error **errp) | |
922 | { | |
923 | return job_finish_sync(job, job_complete, errp); | |
924 | } | |
925 | ||
3453d972 KW |
926 | void job_complete(Job *job, Error **errp) |
927 | { | |
928 | /* Should not be reachable via external interface for internal jobs */ | |
929 | assert(job->id); | |
930 | if (job_apply_verb(job, JOB_VERB_COMPLETE, errp)) { | |
931 | return; | |
932 | } | |
933 | if (job->pause_count || job_is_cancelled(job) || !job->driver->complete) { | |
934 | error_setg(errp, "The active block job '%s' cannot be completed", | |
935 | job->id); | |
936 | return; | |
937 | } | |
938 | ||
939 | job->driver->complete(job, errp); | |
940 | } | |
941 | ||
b15de828 | 942 | |
1908a559 KW |
943 | typedef struct { |
944 | Job *job; | |
945 | JobDeferToMainLoopFn *fn; | |
946 | void *opaque; | |
947 | } JobDeferToMainLoopData; | |
948 | ||
949 | static void job_defer_to_main_loop_bh(void *opaque) | |
950 | { | |
951 | JobDeferToMainLoopData *data = opaque; | |
952 | Job *job = data->job; | |
953 | AioContext *aio_context = job->aio_context; | |
954 | ||
955 | aio_context_acquire(aio_context); | |
956 | data->fn(data->job, data->opaque); | |
957 | aio_context_release(aio_context); | |
958 | ||
959 | g_free(data); | |
960 | } | |
961 | ||
962 | void job_defer_to_main_loop(Job *job, JobDeferToMainLoopFn *fn, void *opaque) | |
963 | { | |
964 | JobDeferToMainLoopData *data = g_malloc(sizeof(*data)); | |
965 | data->job = job; | |
966 | data->fn = fn; | |
967 | data->opaque = opaque; | |
968 | job->deferred_to_main_loop = true; | |
969 | ||
970 | aio_bh_schedule_oneshot(qemu_get_aio_context(), | |
971 | job_defer_to_main_loop_bh, data); | |
972 | } | |
6a74c075 KW |
973 | |
974 | int job_finish_sync(Job *job, void (*finish)(Job *, Error **errp), Error **errp) | |
975 | { | |
976 | Error *local_err = NULL; | |
977 | int ret; | |
978 | ||
979 | job_ref(job); | |
980 | ||
981 | if (finish) { | |
982 | finish(job, &local_err); | |
983 | } | |
984 | if (local_err) { | |
985 | error_propagate(errp, local_err); | |
986 | job_unref(job); | |
987 | return -EBUSY; | |
988 | } | |
989 | /* job_drain calls job_enter, and it should be enough to induce progress | |
990 | * until the job completes or moves to the main thread. */ | |
991 | while (!job->deferred_to_main_loop && !job_is_completed(job)) { | |
992 | job_drain(job); | |
993 | } | |
994 | while (!job_is_completed(job)) { | |
995 | aio_poll(qemu_get_aio_context(), true); | |
996 | } | |
997 | ret = (job_is_cancelled(job) && job->ret == 0) ? -ECANCELED : job->ret; | |
998 | job_unref(job); | |
999 | return ret; | |
1000 | } |