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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 | ||
3d1f8b07 | 372 | error_free(job->err); |
80fa2c75 KW |
373 | g_free(job->id); |
374 | g_free(job); | |
375 | } | |
fd61a701 | 376 | } |
1908a559 | 377 | |
30a5c887 KW |
378 | void job_progress_update(Job *job, uint64_t done) |
379 | { | |
380 | job->progress_current += done; | |
381 | } | |
382 | ||
383 | void job_progress_set_remaining(Job *job, uint64_t remaining) | |
384 | { | |
385 | job->progress_total = job->progress_current + remaining; | |
386 | } | |
387 | ||
62f13600 HR |
388 | void job_progress_increase_remaining(Job *job, uint64_t delta) |
389 | { | |
390 | job->progress_total += delta; | |
391 | } | |
392 | ||
139a9f02 KW |
393 | void job_event_cancelled(Job *job) |
394 | { | |
395 | notifier_list_notify(&job->on_finalize_cancelled, job); | |
396 | } | |
397 | ||
398 | void job_event_completed(Job *job) | |
399 | { | |
400 | notifier_list_notify(&job->on_finalize_completed, job); | |
401 | } | |
402 | ||
7eaa8fb5 | 403 | static void job_event_pending(Job *job) |
139a9f02 KW |
404 | { |
405 | notifier_list_notify(&job->on_pending, job); | |
406 | } | |
407 | ||
2e1795b5 KW |
408 | static void job_event_ready(Job *job) |
409 | { | |
410 | notifier_list_notify(&job->on_ready, job); | |
411 | } | |
412 | ||
da01ff7f KW |
413 | void job_enter_cond(Job *job, bool(*fn)(Job *job)) |
414 | { | |
415 | if (!job_started(job)) { | |
416 | return; | |
417 | } | |
418 | if (job->deferred_to_main_loop) { | |
419 | return; | |
420 | } | |
421 | ||
422 | job_lock(); | |
423 | if (job->busy) { | |
424 | job_unlock(); | |
425 | return; | |
426 | } | |
427 | ||
428 | if (fn && !fn(job)) { | |
429 | job_unlock(); | |
430 | return; | |
431 | } | |
432 | ||
433 | assert(!job->deferred_to_main_loop); | |
434 | timer_del(&job->sleep_timer); | |
435 | job->busy = true; | |
436 | job_unlock(); | |
437 | aio_co_wake(job->co); | |
438 | } | |
439 | ||
5d43e86e KW |
440 | void job_enter(Job *job) |
441 | { | |
442 | job_enter_cond(job, NULL); | |
443 | } | |
444 | ||
da01ff7f | 445 | /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds. |
3d70ff53 KW |
446 | * Reentering the job coroutine with job_enter() before the timer has expired |
447 | * is allowed and cancels the timer. | |
da01ff7f | 448 | * |
3d70ff53 | 449 | * If @ns is (uint64_t) -1, no timer is scheduled and job_enter() must be |
da01ff7f | 450 | * called explicitly. */ |
198c49cc | 451 | static void coroutine_fn job_do_yield(Job *job, uint64_t ns) |
da01ff7f KW |
452 | { |
453 | job_lock(); | |
454 | if (ns != -1) { | |
455 | timer_mod(&job->sleep_timer, ns); | |
456 | } | |
457 | job->busy = false; | |
458 | job_unlock(); | |
459 | qemu_coroutine_yield(); | |
460 | ||
461 | /* Set by job_enter_cond() before re-entering the coroutine. */ | |
462 | assert(job->busy); | |
463 | } | |
464 | ||
465 | void coroutine_fn job_pause_point(Job *job) | |
466 | { | |
467 | assert(job && job_started(job)); | |
468 | ||
469 | if (!job_should_pause(job)) { | |
470 | return; | |
471 | } | |
472 | if (job_is_cancelled(job)) { | |
473 | return; | |
474 | } | |
475 | ||
476 | if (job->driver->pause) { | |
477 | job->driver->pause(job); | |
478 | } | |
479 | ||
480 | if (job_should_pause(job) && !job_is_cancelled(job)) { | |
481 | JobStatus status = job->status; | |
482 | job_state_transition(job, status == JOB_STATUS_READY | |
483 | ? JOB_STATUS_STANDBY | |
484 | : JOB_STATUS_PAUSED); | |
485 | job->paused = true; | |
486 | job_do_yield(job, -1); | |
487 | job->paused = false; | |
488 | job_state_transition(job, status); | |
489 | } | |
490 | ||
491 | if (job->driver->resume) { | |
492 | job->driver->resume(job); | |
493 | } | |
494 | } | |
495 | ||
198c49cc KW |
496 | void job_yield(Job *job) |
497 | { | |
498 | assert(job->busy); | |
499 | ||
500 | /* Check cancellation *before* setting busy = false, too! */ | |
501 | if (job_is_cancelled(job)) { | |
502 | return; | |
503 | } | |
504 | ||
505 | if (!job_should_pause(job)) { | |
506 | job_do_yield(job, -1); | |
507 | } | |
508 | ||
509 | job_pause_point(job); | |
510 | } | |
511 | ||
5d43e86e KW |
512 | void coroutine_fn job_sleep_ns(Job *job, int64_t ns) |
513 | { | |
514 | assert(job->busy); | |
515 | ||
516 | /* Check cancellation *before* setting busy = false, too! */ | |
517 | if (job_is_cancelled(job)) { | |
518 | return; | |
519 | } | |
520 | ||
521 | if (!job_should_pause(job)) { | |
522 | job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns); | |
523 | } | |
524 | ||
525 | job_pause_point(job); | |
526 | } | |
527 | ||
b69f777d KW |
528 | void job_drain(Job *job) |
529 | { | |
530 | /* If job is !busy this kicks it into the next pause point. */ | |
531 | job_enter(job); | |
532 | ||
533 | if (job->driver->drain) { | |
534 | job->driver->drain(job); | |
535 | } | |
536 | } | |
537 | ||
00359a71 JS |
538 | static void job_exit(void *opaque) |
539 | { | |
540 | Job *job = (Job *)opaque; | |
541 | AioContext *aio_context = job->aio_context; | |
542 | ||
543 | if (job->driver->exit) { | |
544 | aio_context_acquire(aio_context); | |
545 | job->driver->exit(job); | |
546 | aio_context_release(aio_context); | |
547 | } | |
548 | job_completed(job, job->ret); | |
549 | } | |
b69f777d | 550 | |
da01ff7f KW |
551 | /** |
552 | * All jobs must allow a pause point before entering their job proper. This | |
553 | * ensures that jobs can be paused prior to being started, then resumed later. | |
554 | */ | |
555 | static void coroutine_fn job_co_entry(void *opaque) | |
556 | { | |
557 | Job *job = opaque; | |
558 | ||
f67432a2 | 559 | assert(job && job->driver && job->driver->run); |
da01ff7f | 560 | job_pause_point(job); |
3d1f8b07 | 561 | job->ret = job->driver->run(job, &job->err); |
00359a71 JS |
562 | if (!job->deferred_to_main_loop) { |
563 | job->deferred_to_main_loop = true; | |
564 | aio_bh_schedule_oneshot(qemu_get_aio_context(), | |
565 | job_exit, | |
566 | job); | |
567 | } | |
da01ff7f KW |
568 | } |
569 | ||
570 | ||
571 | void job_start(Job *job) | |
572 | { | |
573 | assert(job && !job_started(job) && job->paused && | |
f67432a2 | 574 | job->driver && job->driver->run); |
da01ff7f KW |
575 | job->co = qemu_coroutine_create(job_co_entry, job); |
576 | job->pause_count--; | |
577 | job->busy = true; | |
578 | job->paused = false; | |
579 | job_state_transition(job, JOB_STATUS_RUNNING); | |
580 | aio_co_enter(job->aio_context, job->co); | |
581 | } | |
582 | ||
b15de828 KW |
583 | /* Assumes the block_job_mutex is held */ |
584 | static bool job_timer_not_pending(Job *job) | |
585 | { | |
586 | return !timer_pending(&job->sleep_timer); | |
587 | } | |
588 | ||
589 | void job_pause(Job *job) | |
590 | { | |
591 | job->pause_count++; | |
592 | } | |
593 | ||
594 | void job_resume(Job *job) | |
595 | { | |
596 | assert(job->pause_count > 0); | |
597 | job->pause_count--; | |
598 | if (job->pause_count) { | |
599 | return; | |
600 | } | |
601 | ||
602 | /* kick only if no timer is pending */ | |
603 | job_enter_cond(job, job_timer_not_pending); | |
604 | } | |
605 | ||
606 | void job_user_pause(Job *job, Error **errp) | |
607 | { | |
608 | if (job_apply_verb(job, JOB_VERB_PAUSE, errp)) { | |
609 | return; | |
610 | } | |
611 | if (job->user_paused) { | |
612 | error_setg(errp, "Job is already paused"); | |
613 | return; | |
614 | } | |
615 | job->user_paused = true; | |
616 | job_pause(job); | |
617 | } | |
618 | ||
619 | bool job_user_paused(Job *job) | |
620 | { | |
621 | return job->user_paused; | |
622 | } | |
623 | ||
624 | void job_user_resume(Job *job, Error **errp) | |
625 | { | |
626 | assert(job); | |
627 | if (!job->user_paused || job->pause_count <= 0) { | |
628 | error_setg(errp, "Can't resume a job that was not paused"); | |
629 | return; | |
630 | } | |
631 | if (job_apply_verb(job, JOB_VERB_RESUME, errp)) { | |
632 | return; | |
633 | } | |
634 | if (job->driver->user_resume) { | |
635 | job->driver->user_resume(job); | |
636 | } | |
637 | job->user_paused = false; | |
638 | job_resume(job); | |
639 | } | |
640 | ||
5f9a6a08 | 641 | static void job_do_dismiss(Job *job) |
4ad35181 KW |
642 | { |
643 | assert(job); | |
644 | job->busy = false; | |
645 | job->paused = false; | |
646 | job->deferred_to_main_loop = true; | |
647 | ||
7eaa8fb5 | 648 | job_txn_del_job(job); |
4ad35181 KW |
649 | |
650 | job_state_transition(job, JOB_STATUS_NULL); | |
651 | job_unref(job); | |
652 | } | |
653 | ||
5f9a6a08 KW |
654 | void job_dismiss(Job **jobptr, Error **errp) |
655 | { | |
656 | Job *job = *jobptr; | |
657 | /* similarly to _complete, this is QMP-interface only. */ | |
658 | assert(job->id); | |
659 | if (job_apply_verb(job, JOB_VERB_DISMISS, errp)) { | |
660 | return; | |
661 | } | |
662 | ||
663 | job_do_dismiss(job); | |
664 | *jobptr = NULL; | |
665 | } | |
666 | ||
4ad35181 KW |
667 | void job_early_fail(Job *job) |
668 | { | |
669 | assert(job->status == JOB_STATUS_CREATED); | |
670 | job_do_dismiss(job); | |
671 | } | |
672 | ||
673 | static void job_conclude(Job *job) | |
674 | { | |
675 | job_state_transition(job, JOB_STATUS_CONCLUDED); | |
676 | if (job->auto_dismiss || !job_started(job)) { | |
677 | job_do_dismiss(job); | |
678 | } | |
679 | } | |
680 | ||
3d70ff53 | 681 | static void job_update_rc(Job *job) |
4ad35181 KW |
682 | { |
683 | if (!job->ret && job_is_cancelled(job)) { | |
684 | job->ret = -ECANCELED; | |
685 | } | |
686 | if (job->ret) { | |
3d1f8b07 JS |
687 | if (!job->err) { |
688 | error_setg(&job->err, "%s", strerror(-job->ret)); | |
1266c9b9 | 689 | } |
4ad35181 KW |
690 | job_state_transition(job, JOB_STATUS_ABORTING); |
691 | } | |
692 | } | |
693 | ||
694 | static void job_commit(Job *job) | |
695 | { | |
696 | assert(!job->ret); | |
697 | if (job->driver->commit) { | |
698 | job->driver->commit(job); | |
699 | } | |
700 | } | |
701 | ||
702 | static void job_abort(Job *job) | |
703 | { | |
704 | assert(job->ret); | |
705 | if (job->driver->abort) { | |
706 | job->driver->abort(job); | |
707 | } | |
708 | } | |
709 | ||
710 | static void job_clean(Job *job) | |
711 | { | |
712 | if (job->driver->clean) { | |
713 | job->driver->clean(job); | |
714 | } | |
715 | } | |
716 | ||
7eaa8fb5 | 717 | static int job_finalize_single(Job *job) |
4ad35181 KW |
718 | { |
719 | assert(job_is_completed(job)); | |
720 | ||
721 | /* Ensure abort is called for late-transactional failures */ | |
722 | job_update_rc(job); | |
723 | ||
724 | if (!job->ret) { | |
725 | job_commit(job); | |
726 | } else { | |
727 | job_abort(job); | |
728 | } | |
729 | job_clean(job); | |
730 | ||
731 | if (job->cb) { | |
732 | job->cb(job->opaque, job->ret); | |
733 | } | |
734 | ||
735 | /* Emit events only if we actually started */ | |
736 | if (job_started(job)) { | |
737 | if (job_is_cancelled(job)) { | |
738 | job_event_cancelled(job); | |
739 | } else { | |
740 | job_event_completed(job); | |
741 | } | |
742 | } | |
743 | ||
7eaa8fb5 | 744 | job_txn_del_job(job); |
4ad35181 KW |
745 | job_conclude(job); |
746 | return 0; | |
747 | } | |
748 | ||
3d70ff53 | 749 | static void job_cancel_async(Job *job, bool force) |
7eaa8fb5 KW |
750 | { |
751 | if (job->user_paused) { | |
752 | /* Do not call job_enter here, the caller will handle it. */ | |
7eaa8fb5 KW |
753 | if (job->driver->user_resume) { |
754 | job->driver->user_resume(job); | |
755 | } | |
e321c059 | 756 | job->user_paused = false; |
7eaa8fb5 KW |
757 | assert(job->pause_count > 0); |
758 | job->pause_count--; | |
759 | } | |
760 | job->cancelled = true; | |
761 | /* To prevent 'force == false' overriding a previous 'force == true' */ | |
762 | job->force_cancel |= force; | |
763 | } | |
764 | ||
3d70ff53 | 765 | static void job_completed_txn_abort(Job *job) |
7eaa8fb5 KW |
766 | { |
767 | AioContext *ctx; | |
768 | JobTxn *txn = job->txn; | |
769 | Job *other_job; | |
770 | ||
771 | if (txn->aborting) { | |
772 | /* | |
773 | * We are cancelled by another job, which will handle everything. | |
774 | */ | |
775 | return; | |
776 | } | |
777 | txn->aborting = true; | |
778 | job_txn_ref(txn); | |
779 | ||
780 | /* We are the first failed job. Cancel other jobs. */ | |
781 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
782 | ctx = other_job->aio_context; | |
783 | aio_context_acquire(ctx); | |
784 | } | |
785 | ||
786 | /* Other jobs are effectively cancelled by us, set the status for | |
787 | * them; this job, however, may or may not be cancelled, depending | |
788 | * on the caller, so leave it. */ | |
789 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
790 | if (other_job != job) { | |
791 | job_cancel_async(other_job, false); | |
792 | } | |
793 | } | |
794 | while (!QLIST_EMPTY(&txn->jobs)) { | |
795 | other_job = QLIST_FIRST(&txn->jobs); | |
796 | ctx = other_job->aio_context; | |
797 | if (!job_is_completed(other_job)) { | |
798 | assert(job_is_cancelled(other_job)); | |
799 | job_finish_sync(other_job, NULL, NULL); | |
800 | } | |
801 | job_finalize_single(other_job); | |
802 | aio_context_release(ctx); | |
803 | } | |
804 | ||
805 | job_txn_unref(txn); | |
806 | } | |
807 | ||
808 | static int job_prepare(Job *job) | |
809 | { | |
810 | if (job->ret == 0 && job->driver->prepare) { | |
811 | job->ret = job->driver->prepare(job); | |
1266c9b9 | 812 | job_update_rc(job); |
7eaa8fb5 KW |
813 | } |
814 | return job->ret; | |
815 | } | |
816 | ||
817 | static int job_needs_finalize(Job *job) | |
818 | { | |
819 | return !job->auto_finalize; | |
820 | } | |
821 | ||
822 | static void job_do_finalize(Job *job) | |
823 | { | |
824 | int rc; | |
825 | assert(job && job->txn); | |
826 | ||
827 | /* prepare the transaction to complete */ | |
828 | rc = job_txn_apply(job->txn, job_prepare, true); | |
829 | if (rc) { | |
830 | job_completed_txn_abort(job); | |
831 | } else { | |
832 | job_txn_apply(job->txn, job_finalize_single, true); | |
833 | } | |
834 | } | |
835 | ||
836 | void job_finalize(Job *job, Error **errp) | |
837 | { | |
838 | assert(job && job->id); | |
839 | if (job_apply_verb(job, JOB_VERB_FINALIZE, errp)) { | |
840 | return; | |
841 | } | |
842 | job_do_finalize(job); | |
843 | } | |
844 | ||
845 | static int job_transition_to_pending(Job *job) | |
846 | { | |
847 | job_state_transition(job, JOB_STATUS_PENDING); | |
848 | if (!job->auto_finalize) { | |
849 | job_event_pending(job); | |
850 | } | |
851 | return 0; | |
852 | } | |
853 | ||
2e1795b5 KW |
854 | void job_transition_to_ready(Job *job) |
855 | { | |
856 | job_state_transition(job, JOB_STATUS_READY); | |
857 | job_event_ready(job); | |
858 | } | |
859 | ||
3d70ff53 | 860 | static void job_completed_txn_success(Job *job) |
7eaa8fb5 KW |
861 | { |
862 | JobTxn *txn = job->txn; | |
863 | Job *other_job; | |
864 | ||
865 | job_state_transition(job, JOB_STATUS_WAITING); | |
866 | ||
867 | /* | |
868 | * Successful completion, see if there are other running jobs in this | |
869 | * txn. | |
870 | */ | |
871 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
872 | if (!job_is_completed(other_job)) { | |
873 | return; | |
874 | } | |
875 | assert(other_job->ret == 0); | |
876 | } | |
877 | ||
878 | job_txn_apply(txn, job_transition_to_pending, false); | |
879 | ||
880 | /* If no jobs need manual finalization, automatically do so */ | |
881 | if (job_txn_apply(txn, job_needs_finalize, false) == 0) { | |
882 | job_do_finalize(job); | |
883 | } | |
884 | } | |
885 | ||
3d1f8b07 | 886 | void job_completed(Job *job, int ret) |
3d70ff53 KW |
887 | { |
888 | assert(job && job->txn && !job_is_completed(job)); | |
1266c9b9 | 889 | |
3d70ff53 KW |
890 | job->ret = ret; |
891 | job_update_rc(job); | |
892 | trace_job_completed(job, ret, job->ret); | |
893 | if (job->ret) { | |
894 | job_completed_txn_abort(job); | |
895 | } else { | |
896 | job_completed_txn_success(job); | |
897 | } | |
898 | } | |
899 | ||
900 | void job_cancel(Job *job, bool force) | |
901 | { | |
902 | if (job->status == JOB_STATUS_CONCLUDED) { | |
903 | job_do_dismiss(job); | |
904 | return; | |
905 | } | |
906 | job_cancel_async(job, force); | |
907 | if (!job_started(job)) { | |
3d1f8b07 | 908 | job_completed(job, -ECANCELED); |
3d70ff53 KW |
909 | } else if (job->deferred_to_main_loop) { |
910 | job_completed_txn_abort(job); | |
911 | } else { | |
912 | job_enter(job); | |
913 | } | |
914 | } | |
915 | ||
916 | void job_user_cancel(Job *job, bool force, Error **errp) | |
917 | { | |
918 | if (job_apply_verb(job, JOB_VERB_CANCEL, errp)) { | |
919 | return; | |
920 | } | |
921 | job_cancel(job, force); | |
922 | } | |
923 | ||
924 | /* A wrapper around job_cancel() taking an Error ** parameter so it may be | |
925 | * used with job_finish_sync() without the need for (rather nasty) function | |
926 | * pointer casts there. */ | |
927 | static void job_cancel_err(Job *job, Error **errp) | |
928 | { | |
929 | job_cancel(job, false); | |
930 | } | |
931 | ||
932 | int job_cancel_sync(Job *job) | |
933 | { | |
934 | return job_finish_sync(job, &job_cancel_err, NULL); | |
935 | } | |
936 | ||
937 | void job_cancel_sync_all(void) | |
938 | { | |
939 | Job *job; | |
940 | AioContext *aio_context; | |
941 | ||
942 | while ((job = job_next(NULL))) { | |
943 | aio_context = job->aio_context; | |
944 | aio_context_acquire(aio_context); | |
945 | job_cancel_sync(job); | |
946 | aio_context_release(aio_context); | |
947 | } | |
948 | } | |
949 | ||
950 | int job_complete_sync(Job *job, Error **errp) | |
951 | { | |
952 | return job_finish_sync(job, job_complete, errp); | |
953 | } | |
954 | ||
3453d972 KW |
955 | void job_complete(Job *job, Error **errp) |
956 | { | |
957 | /* Should not be reachable via external interface for internal jobs */ | |
958 | assert(job->id); | |
959 | if (job_apply_verb(job, JOB_VERB_COMPLETE, errp)) { | |
960 | return; | |
961 | } | |
962 | if (job->pause_count || job_is_cancelled(job) || !job->driver->complete) { | |
963 | error_setg(errp, "The active block job '%s' cannot be completed", | |
964 | job->id); | |
965 | return; | |
966 | } | |
967 | ||
968 | job->driver->complete(job, errp); | |
969 | } | |
970 | ||
b15de828 | 971 | |
1908a559 KW |
972 | typedef struct { |
973 | Job *job; | |
974 | JobDeferToMainLoopFn *fn; | |
975 | void *opaque; | |
976 | } JobDeferToMainLoopData; | |
977 | ||
978 | static void job_defer_to_main_loop_bh(void *opaque) | |
979 | { | |
980 | JobDeferToMainLoopData *data = opaque; | |
981 | Job *job = data->job; | |
982 | AioContext *aio_context = job->aio_context; | |
983 | ||
984 | aio_context_acquire(aio_context); | |
985 | data->fn(data->job, data->opaque); | |
986 | aio_context_release(aio_context); | |
987 | ||
988 | g_free(data); | |
989 | } | |
990 | ||
991 | void job_defer_to_main_loop(Job *job, JobDeferToMainLoopFn *fn, void *opaque) | |
992 | { | |
993 | JobDeferToMainLoopData *data = g_malloc(sizeof(*data)); | |
994 | data->job = job; | |
995 | data->fn = fn; | |
996 | data->opaque = opaque; | |
997 | job->deferred_to_main_loop = true; | |
998 | ||
999 | aio_bh_schedule_oneshot(qemu_get_aio_context(), | |
1000 | job_defer_to_main_loop_bh, data); | |
1001 | } | |
6a74c075 KW |
1002 | |
1003 | int job_finish_sync(Job *job, void (*finish)(Job *, Error **errp), Error **errp) | |
1004 | { | |
1005 | Error *local_err = NULL; | |
1006 | int ret; | |
1007 | ||
1008 | job_ref(job); | |
1009 | ||
1010 | if (finish) { | |
1011 | finish(job, &local_err); | |
1012 | } | |
1013 | if (local_err) { | |
1014 | error_propagate(errp, local_err); | |
1015 | job_unref(job); | |
1016 | return -EBUSY; | |
1017 | } | |
1018 | /* job_drain calls job_enter, and it should be enough to induce progress | |
1019 | * until the job completes or moves to the main thread. */ | |
1020 | while (!job->deferred_to_main_loop && !job_is_completed(job)) { | |
1021 | job_drain(job); | |
1022 | } | |
1023 | while (!job_is_completed(job)) { | |
1024 | aio_poll(qemu_get_aio_context(), true); | |
1025 | } | |
1026 | ret = (job_is_cancelled(job) && job->ret == 0) ? -ECANCELED : job->ret; | |
1027 | job_unref(job); | |
1028 | return ret; | |
1029 | } |