2 * Background jobs (long-running operations)
4 * Copyright (c) 2011 IBM Corp.
5 * Copyright (c) 2012, 2018 Red Hat, Inc.
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12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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26 #include "qemu/osdep.h"
27 #include "qapi/error.h"
30 #include "qemu/main-loop.h"
31 #include "block/aio-wait.h"
32 #include "trace/trace-root.h"
33 #include "qapi/qapi-events-job.h"
35 static QLIST_HEAD(, Job) jobs = QLIST_HEAD_INITIALIZER(jobs);
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},
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, 1, 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},
64 /* Transactional group of jobs */
67 /* Is this txn being cancelled? */
71 QLIST_HEAD(, Job) jobs;
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
80 static QemuMutex job_mutex;
82 static void job_lock(void)
84 qemu_mutex_lock(&job_mutex);
87 static void job_unlock(void)
89 qemu_mutex_unlock(&job_mutex);
92 static void __attribute__((__constructor__)) job_init(void)
94 qemu_mutex_init(&job_mutex);
97 JobTxn *job_txn_new(void)
99 JobTxn *txn = g_new0(JobTxn, 1);
100 QLIST_INIT(&txn->jobs);
105 static void job_txn_ref(JobTxn *txn)
110 void job_txn_unref(JobTxn *txn)
112 if (txn && --txn->refcnt == 0) {
117 void job_txn_add_job(JobTxn *txn, Job *job)
126 QLIST_INSERT_HEAD(&txn->jobs, job, txn_list);
130 static void job_txn_del_job(Job *job)
133 QLIST_REMOVE(job, txn_list);
134 job_txn_unref(job->txn);
139 static int job_txn_apply(Job *job, int fn(Job *))
141 AioContext *inner_ctx;
142 Job *other_job, *next;
143 JobTxn *txn = job->txn;
147 * Similar to job_completed_txn_abort, we take each job's lock before
148 * applying fn, but since we assume that outer_ctx is held by the caller,
149 * we need to release it here to avoid holding the lock twice - which would
150 * break AIO_WAIT_WHILE from within fn.
153 aio_context_release(job->aio_context);
155 QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
156 inner_ctx = other_job->aio_context;
157 aio_context_acquire(inner_ctx);
159 aio_context_release(inner_ctx);
166 * Note that job->aio_context might have been changed by calling fn, so we
167 * can't use a local variable to cache it.
169 aio_context_acquire(job->aio_context);
174 bool job_is_internal(Job *job)
176 return (job->id == NULL);
179 static void job_state_transition(Job *job, JobStatus s1)
181 JobStatus s0 = job->status;
182 assert(s1 >= 0 && s1 < JOB_STATUS__MAX);
183 trace_job_state_transition(job, job->ret,
184 JobSTT[s0][s1] ? "allowed" : "disallowed",
185 JobStatus_str(s0), JobStatus_str(s1));
186 assert(JobSTT[s0][s1]);
189 if (!job_is_internal(job) && s1 != s0) {
190 qapi_event_send_job_status_change(job->id, job->status);
194 int job_apply_verb(Job *job, JobVerb verb, Error **errp)
196 JobStatus s0 = job->status;
197 assert(verb >= 0 && verb < JOB_VERB__MAX);
198 trace_job_apply_verb(job, JobStatus_str(s0), JobVerb_str(verb),
199 JobVerbTable[verb][s0] ? "allowed" : "prohibited");
200 if (JobVerbTable[verb][s0]) {
203 error_setg(errp, "Job '%s' in state '%s' cannot accept command verb '%s'",
204 job->id, JobStatus_str(s0), JobVerb_str(verb));
208 JobType job_type(const Job *job)
210 return job->driver->job_type;
213 const char *job_type_str(const Job *job)
215 return JobType_str(job_type(job));
218 bool job_is_cancelled(Job *job)
220 /* force_cancel may be true only if cancelled is true, too */
221 assert(job->cancelled || !job->force_cancel);
222 return job->force_cancel;
225 bool job_cancel_requested(Job *job)
227 return job->cancelled;
230 bool job_is_ready(Job *job)
232 switch (job->status) {
233 case JOB_STATUS_UNDEFINED:
234 case JOB_STATUS_CREATED:
235 case JOB_STATUS_RUNNING:
236 case JOB_STATUS_PAUSED:
237 case JOB_STATUS_WAITING:
238 case JOB_STATUS_PENDING:
239 case JOB_STATUS_ABORTING:
240 case JOB_STATUS_CONCLUDED:
241 case JOB_STATUS_NULL:
243 case JOB_STATUS_READY:
244 case JOB_STATUS_STANDBY:
247 g_assert_not_reached();
252 bool job_is_completed(Job *job)
254 switch (job->status) {
255 case JOB_STATUS_UNDEFINED:
256 case JOB_STATUS_CREATED:
257 case JOB_STATUS_RUNNING:
258 case JOB_STATUS_PAUSED:
259 case JOB_STATUS_READY:
260 case JOB_STATUS_STANDBY:
262 case JOB_STATUS_WAITING:
263 case JOB_STATUS_PENDING:
264 case JOB_STATUS_ABORTING:
265 case JOB_STATUS_CONCLUDED:
266 case JOB_STATUS_NULL:
269 g_assert_not_reached();
274 static bool job_started(Job *job)
279 static bool job_should_pause(Job *job)
281 return job->pause_count > 0;
284 Job *job_next(Job *job)
287 return QLIST_FIRST(&jobs);
289 return QLIST_NEXT(job, job_list);
292 Job *job_get(const char *id)
296 QLIST_FOREACH(job, &jobs, job_list) {
297 if (job->id && !strcmp(id, job->id)) {
305 static void job_sleep_timer_cb(void *opaque)
312 void *job_create(const char *job_id, const JobDriver *driver, JobTxn *txn,
313 AioContext *ctx, int flags, BlockCompletionFunc *cb,
314 void *opaque, Error **errp)
319 if (flags & JOB_INTERNAL) {
320 error_setg(errp, "Cannot specify job ID for internal job");
323 if (!id_wellformed(job_id)) {
324 error_setg(errp, "Invalid job ID '%s'", job_id);
327 if (job_get(job_id)) {
328 error_setg(errp, "Job ID '%s' already in use", job_id);
331 } else if (!(flags & JOB_INTERNAL)) {
332 error_setg(errp, "An explicit job ID is required");
336 job = g_malloc0(driver->instance_size);
337 job->driver = driver;
338 job->id = g_strdup(job_id);
340 job->aio_context = ctx;
343 job->pause_count = 1;
344 job->auto_finalize = !(flags & JOB_MANUAL_FINALIZE);
345 job->auto_dismiss = !(flags & JOB_MANUAL_DISMISS);
347 job->opaque = opaque;
349 progress_init(&job->progress);
351 notifier_list_init(&job->on_finalize_cancelled);
352 notifier_list_init(&job->on_finalize_completed);
353 notifier_list_init(&job->on_pending);
354 notifier_list_init(&job->on_ready);
356 job_state_transition(job, JOB_STATUS_CREATED);
357 aio_timer_init(qemu_get_aio_context(), &job->sleep_timer,
358 QEMU_CLOCK_REALTIME, SCALE_NS,
359 job_sleep_timer_cb, job);
361 QLIST_INSERT_HEAD(&jobs, job, job_list);
363 /* Single jobs are modeled as single-job transactions for sake of
364 * consolidating the job management logic */
367 job_txn_add_job(txn, job);
370 job_txn_add_job(txn, job);
376 void job_ref(Job *job)
381 void job_unref(Job *job)
383 if (--job->refcnt == 0) {
384 assert(job->status == JOB_STATUS_NULL);
385 assert(!timer_pending(&job->sleep_timer));
388 if (job->driver->free) {
389 job->driver->free(job);
392 QLIST_REMOVE(job, job_list);
394 progress_destroy(&job->progress);
395 error_free(job->err);
401 void job_progress_update(Job *job, uint64_t done)
403 progress_work_done(&job->progress, done);
406 void job_progress_set_remaining(Job *job, uint64_t remaining)
408 progress_set_remaining(&job->progress, remaining);
411 void job_progress_increase_remaining(Job *job, uint64_t delta)
413 progress_increase_remaining(&job->progress, delta);
416 void job_event_cancelled(Job *job)
418 notifier_list_notify(&job->on_finalize_cancelled, job);
421 void job_event_completed(Job *job)
423 notifier_list_notify(&job->on_finalize_completed, job);
426 static void job_event_pending(Job *job)
428 notifier_list_notify(&job->on_pending, job);
431 static void job_event_ready(Job *job)
433 notifier_list_notify(&job->on_ready, job);
436 static void job_event_idle(Job *job)
438 notifier_list_notify(&job->on_idle, job);
441 void job_enter_cond(Job *job, bool(*fn)(Job *job))
443 if (!job_started(job)) {
446 if (job->deferred_to_main_loop) {
456 if (fn && !fn(job)) {
461 assert(!job->deferred_to_main_loop);
462 timer_del(&job->sleep_timer);
465 aio_co_enter(job->aio_context, job->co);
468 void job_enter(Job *job)
470 job_enter_cond(job, NULL);
473 /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds.
474 * Reentering the job coroutine with job_enter() before the timer has expired
475 * is allowed and cancels the timer.
477 * If @ns is (uint64_t) -1, no timer is scheduled and job_enter() must be
478 * called explicitly. */
479 static void coroutine_fn job_do_yield(Job *job, uint64_t ns)
483 timer_mod(&job->sleep_timer, ns);
488 qemu_coroutine_yield();
490 /* Set by job_enter_cond() before re-entering the coroutine. */
494 void coroutine_fn job_pause_point(Job *job)
496 assert(job && job_started(job));
498 if (!job_should_pause(job)) {
501 if (job_is_cancelled(job)) {
505 if (job->driver->pause) {
506 job->driver->pause(job);
509 if (job_should_pause(job) && !job_is_cancelled(job)) {
510 JobStatus status = job->status;
511 job_state_transition(job, status == JOB_STATUS_READY
513 : JOB_STATUS_PAUSED);
515 job_do_yield(job, -1);
517 job_state_transition(job, status);
520 if (job->driver->resume) {
521 job->driver->resume(job);
525 void job_yield(Job *job)
529 /* Check cancellation *before* setting busy = false, too! */
530 if (job_is_cancelled(job)) {
534 if (!job_should_pause(job)) {
535 job_do_yield(job, -1);
538 job_pause_point(job);
541 void coroutine_fn job_sleep_ns(Job *job, int64_t ns)
545 /* Check cancellation *before* setting busy = false, too! */
546 if (job_is_cancelled(job)) {
550 if (!job_should_pause(job)) {
551 job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns);
554 job_pause_point(job);
557 /* Assumes the block_job_mutex is held */
558 static bool job_timer_not_pending(Job *job)
560 return !timer_pending(&job->sleep_timer);
563 void job_pause(Job *job)
571 void job_resume(Job *job)
573 assert(job->pause_count > 0);
575 if (job->pause_count) {
579 /* kick only if no timer is pending */
580 job_enter_cond(job, job_timer_not_pending);
583 void job_user_pause(Job *job, Error **errp)
585 if (job_apply_verb(job, JOB_VERB_PAUSE, errp)) {
588 if (job->user_paused) {
589 error_setg(errp, "Job is already paused");
592 job->user_paused = true;
596 bool job_user_paused(Job *job)
598 return job->user_paused;
601 void job_user_resume(Job *job, Error **errp)
604 if (!job->user_paused || job->pause_count <= 0) {
605 error_setg(errp, "Can't resume a job that was not paused");
608 if (job_apply_verb(job, JOB_VERB_RESUME, errp)) {
611 if (job->driver->user_resume) {
612 job->driver->user_resume(job);
614 job->user_paused = false;
618 static void job_do_dismiss(Job *job)
623 job->deferred_to_main_loop = true;
625 job_txn_del_job(job);
627 job_state_transition(job, JOB_STATUS_NULL);
631 void job_dismiss(Job **jobptr, Error **errp)
634 /* similarly to _complete, this is QMP-interface only. */
636 if (job_apply_verb(job, JOB_VERB_DISMISS, errp)) {
644 void job_early_fail(Job *job)
646 assert(job->status == JOB_STATUS_CREATED);
650 static void job_conclude(Job *job)
652 job_state_transition(job, JOB_STATUS_CONCLUDED);
653 if (job->auto_dismiss || !job_started(job)) {
658 static void job_update_rc(Job *job)
660 if (!job->ret && job_is_cancelled(job)) {
661 job->ret = -ECANCELED;
665 error_setg(&job->err, "%s", strerror(-job->ret));
667 job_state_transition(job, JOB_STATUS_ABORTING);
671 static void job_commit(Job *job)
674 if (job->driver->commit) {
675 job->driver->commit(job);
679 static void job_abort(Job *job)
682 if (job->driver->abort) {
683 job->driver->abort(job);
687 static void job_clean(Job *job)
689 if (job->driver->clean) {
690 job->driver->clean(job);
694 static int job_finalize_single(Job *job)
696 assert(job_is_completed(job));
698 /* Ensure abort is called for late-transactional failures */
709 job->cb(job->opaque, job->ret);
712 /* Emit events only if we actually started */
713 if (job_started(job)) {
714 if (job_is_cancelled(job)) {
715 job_event_cancelled(job);
717 job_event_completed(job);
721 job_txn_del_job(job);
726 static void job_cancel_async(Job *job, bool force)
728 if (job->driver->cancel) {
729 force = job->driver->cancel(job, force);
731 /* No .cancel() means the job will behave as if force-cancelled */
735 if (job->user_paused) {
736 /* Do not call job_enter here, the caller will handle it. */
737 if (job->driver->user_resume) {
738 job->driver->user_resume(job);
740 job->user_paused = false;
741 assert(job->pause_count > 0);
746 * Ignore soft cancel requests after the job is already done
747 * (We will still invoke job->driver->cancel() above, but if the
748 * job driver supports soft cancelling and the job is done, that
749 * should be a no-op, too. We still call it so it can override
752 if (force || !job->deferred_to_main_loop) {
753 job->cancelled = true;
754 /* To prevent 'force == false' overriding a previous 'force == true' */
755 job->force_cancel |= force;
759 static void job_completed_txn_abort(Job *job)
762 JobTxn *txn = job->txn;
767 * We are cancelled by another job, which will handle everything.
771 txn->aborting = true;
775 * We can only hold the single job's AioContext lock while calling
776 * job_finalize_single() because the finalization callbacks can involve
777 * calls of AIO_WAIT_WHILE(), which could deadlock otherwise.
778 * Note that the job's AioContext may change when it is finalized.
781 aio_context_release(job->aio_context);
783 /* Other jobs are effectively cancelled by us, set the status for
784 * them; this job, however, may or may not be cancelled, depending
785 * on the caller, so leave it. */
786 QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
787 if (other_job != job) {
788 ctx = other_job->aio_context;
789 aio_context_acquire(ctx);
791 * This is a transaction: If one job failed, no result will matter.
792 * Therefore, pass force=true to terminate all other jobs as quickly
795 job_cancel_async(other_job, true);
796 aio_context_release(ctx);
799 while (!QLIST_EMPTY(&txn->jobs)) {
800 other_job = QLIST_FIRST(&txn->jobs);
802 * The job's AioContext may change, so store it in @ctx so we
803 * release the same context that we have acquired before.
805 ctx = other_job->aio_context;
806 aio_context_acquire(ctx);
807 if (!job_is_completed(other_job)) {
808 assert(job_cancel_requested(other_job));
809 job_finish_sync(other_job, NULL, NULL);
811 job_finalize_single(other_job);
812 aio_context_release(ctx);
816 * Use job_ref()/job_unref() so we can read the AioContext here
817 * even if the job went away during job_finalize_single().
819 aio_context_acquire(job->aio_context);
825 static int job_prepare(Job *job)
827 if (job->ret == 0 && job->driver->prepare) {
828 job->ret = job->driver->prepare(job);
834 static int job_needs_finalize(Job *job)
836 return !job->auto_finalize;
839 static void job_do_finalize(Job *job)
842 assert(job && job->txn);
844 /* prepare the transaction to complete */
845 rc = job_txn_apply(job, job_prepare);
847 job_completed_txn_abort(job);
849 job_txn_apply(job, job_finalize_single);
853 void job_finalize(Job *job, Error **errp)
855 assert(job && job->id);
856 if (job_apply_verb(job, JOB_VERB_FINALIZE, errp)) {
859 job_do_finalize(job);
862 static int job_transition_to_pending(Job *job)
864 job_state_transition(job, JOB_STATUS_PENDING);
865 if (!job->auto_finalize) {
866 job_event_pending(job);
871 void job_transition_to_ready(Job *job)
873 job_state_transition(job, JOB_STATUS_READY);
874 job_event_ready(job);
877 static void job_completed_txn_success(Job *job)
879 JobTxn *txn = job->txn;
882 job_state_transition(job, JOB_STATUS_WAITING);
885 * Successful completion, see if there are other running jobs in this
888 QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
889 if (!job_is_completed(other_job)) {
892 assert(other_job->ret == 0);
895 job_txn_apply(job, job_transition_to_pending);
897 /* If no jobs need manual finalization, automatically do so */
898 if (job_txn_apply(job, job_needs_finalize) == 0) {
899 job_do_finalize(job);
903 static void job_completed(Job *job)
905 assert(job && job->txn && !job_is_completed(job));
908 trace_job_completed(job, job->ret);
910 job_completed_txn_abort(job);
912 job_completed_txn_success(job);
916 /** Useful only as a type shim for aio_bh_schedule_oneshot. */
917 static void job_exit(void *opaque)
919 Job *job = (Job *)opaque;
923 aio_context_acquire(job->aio_context);
925 /* This is a lie, we're not quiescent, but still doing the completion
926 * callbacks. However, completion callbacks tend to involve operations that
927 * drain block nodes, and if .drained_poll still returned true, we would
935 * Note that calling job_completed can move the job to a different
936 * aio_context, so we cannot cache from above. job_txn_apply takes care of
937 * acquiring the new lock, and we ref/unref to avoid job_completed freeing
938 * the job underneath us.
940 ctx = job->aio_context;
942 aio_context_release(ctx);
946 * All jobs must allow a pause point before entering their job proper. This
947 * ensures that jobs can be paused prior to being started, then resumed later.
949 static void coroutine_fn job_co_entry(void *opaque)
953 assert(job && job->driver && job->driver->run);
954 job_pause_point(job);
955 job->ret = job->driver->run(job, &job->err);
956 job->deferred_to_main_loop = true;
958 aio_bh_schedule_oneshot(qemu_get_aio_context(), job_exit, job);
961 void job_start(Job *job)
963 assert(job && !job_started(job) && job->paused &&
964 job->driver && job->driver->run);
965 job->co = qemu_coroutine_create(job_co_entry, job);
969 job_state_transition(job, JOB_STATUS_RUNNING);
970 aio_co_enter(job->aio_context, job->co);
973 void job_cancel(Job *job, bool force)
975 if (job->status == JOB_STATUS_CONCLUDED) {
979 job_cancel_async(job, force);
980 if (!job_started(job)) {
982 } else if (job->deferred_to_main_loop) {
984 * job_cancel_async() ignores soft-cancel requests for jobs
985 * that are already done (i.e. deferred to the main loop). We
986 * have to check again whether the job is really cancelled.
987 * (job_cancel_requested() and job_is_cancelled() are equivalent
988 * here, because job_cancel_async() will make soft-cancel
989 * requests no-ops when deferred_to_main_loop is true. We
990 * choose to call job_is_cancelled() to show that we invoke
991 * job_completed_txn_abort() only for force-cancelled jobs.)
993 if (job_is_cancelled(job)) {
994 job_completed_txn_abort(job);
1001 void job_user_cancel(Job *job, bool force, Error **errp)
1003 if (job_apply_verb(job, JOB_VERB_CANCEL, errp)) {
1006 job_cancel(job, force);
1009 /* A wrapper around job_cancel() taking an Error ** parameter so it may be
1010 * used with job_finish_sync() without the need for (rather nasty) function
1011 * pointer casts there. */
1012 static void job_cancel_err(Job *job, Error **errp)
1014 job_cancel(job, false);
1018 * Same as job_cancel_err(), but force-cancel.
1020 static void job_force_cancel_err(Job *job, Error **errp)
1022 job_cancel(job, true);
1025 int job_cancel_sync(Job *job, bool force)
1028 return job_finish_sync(job, &job_force_cancel_err, NULL);
1030 return job_finish_sync(job, &job_cancel_err, NULL);
1034 void job_cancel_sync_all(void)
1037 AioContext *aio_context;
1039 while ((job = job_next(NULL))) {
1040 aio_context = job->aio_context;
1041 aio_context_acquire(aio_context);
1042 job_cancel_sync(job, true);
1043 aio_context_release(aio_context);
1047 int job_complete_sync(Job *job, Error **errp)
1049 return job_finish_sync(job, job_complete, errp);
1052 void job_complete(Job *job, Error **errp)
1054 /* Should not be reachable via external interface for internal jobs */
1056 if (job_apply_verb(job, JOB_VERB_COMPLETE, errp)) {
1059 if (job_cancel_requested(job) || !job->driver->complete) {
1060 error_setg(errp, "The active block job '%s' cannot be completed",
1065 job->driver->complete(job, errp);
1068 int job_finish_sync(Job *job, void (*finish)(Job *, Error **errp), Error **errp)
1070 Error *local_err = NULL;
1076 finish(job, &local_err);
1079 error_propagate(errp, local_err);
1084 AIO_WAIT_WHILE(job->aio_context,
1085 (job_enter(job), !job_is_completed(job)));
1087 ret = (job_is_cancelled(job) && job->ret == 0) ? -ECANCELED : job->ret;