qemu-nbd: Update version string
[qemu/kevin.git] / blockjob.c
blob70a78188b7876cc0f3db0225a3db320ecfabeaef
1 /*
2 * QEMU System Emulator block driver
4 * Copyright (c) 2011 IBM Corp.
5 * Copyright (c) 2012 Red Hat, Inc.
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:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
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.
26 #include "qemu/osdep.h"
27 #include "qemu-common.h"
28 #include "block/block.h"
29 #include "block/blockjob_int.h"
30 #include "block/block_int.h"
31 #include "sysemu/block-backend.h"
32 #include "qapi/qmp/qerror.h"
33 #include "qapi/qmp/qjson.h"
34 #include "qemu/coroutine.h"
35 #include "qemu/id.h"
36 #include "qmp-commands.h"
37 #include "qemu/timer.h"
38 #include "qapi-event.h"
40 static void block_job_event_cancelled(BlockJob *job);
41 static void block_job_event_completed(BlockJob *job, const char *msg);
43 /* Transactional group of block jobs */
44 struct BlockJobTxn {
46 /* Is this txn being cancelled? */
47 bool aborting;
49 /* List of jobs */
50 QLIST_HEAD(, BlockJob) jobs;
52 /* Reference count */
53 int refcnt;
56 static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs);
59 * The block job API is composed of two categories of functions.
61 * The first includes functions used by the monitor. The monitor is
62 * peculiar in that it accesses the block job list with block_job_get, and
63 * therefore needs consistency across block_job_get and the actual operation
64 * (e.g. block_job_set_speed). The consistency is achieved with
65 * aio_context_acquire/release. These functions are declared in blockjob.h.
67 * The second includes functions used by the block job drivers and sometimes
68 * by the core block layer. These do not care about locking, because the
69 * whole coroutine runs under the AioContext lock, and are declared in
70 * blockjob_int.h.
73 BlockJob *block_job_next(BlockJob *job)
75 if (!job) {
76 return QLIST_FIRST(&block_jobs);
78 return QLIST_NEXT(job, job_list);
81 BlockJob *block_job_get(const char *id)
83 BlockJob *job;
85 QLIST_FOREACH(job, &block_jobs, job_list) {
86 if (job->id && !strcmp(id, job->id)) {
87 return job;
91 return NULL;
94 BlockJobTxn *block_job_txn_new(void)
96 BlockJobTxn *txn = g_new0(BlockJobTxn, 1);
97 QLIST_INIT(&txn->jobs);
98 txn->refcnt = 1;
99 return txn;
102 static void block_job_txn_ref(BlockJobTxn *txn)
104 txn->refcnt++;
107 void block_job_txn_unref(BlockJobTxn *txn)
109 if (txn && --txn->refcnt == 0) {
110 g_free(txn);
114 void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job)
116 if (!txn) {
117 return;
120 assert(!job->txn);
121 job->txn = txn;
123 QLIST_INSERT_HEAD(&txn->jobs, job, txn_list);
124 block_job_txn_ref(txn);
127 static void block_job_pause(BlockJob *job)
129 job->pause_count++;
132 static void block_job_resume(BlockJob *job)
134 assert(job->pause_count > 0);
135 job->pause_count--;
136 if (job->pause_count) {
137 return;
139 block_job_enter(job);
142 void block_job_ref(BlockJob *job)
144 ++job->refcnt;
147 static void block_job_attached_aio_context(AioContext *new_context,
148 void *opaque);
149 static void block_job_detach_aio_context(void *opaque);
151 void block_job_unref(BlockJob *job)
153 if (--job->refcnt == 0) {
154 BlockDriverState *bs = blk_bs(job->blk);
155 bs->job = NULL;
156 block_job_remove_all_bdrv(job);
157 blk_remove_aio_context_notifier(job->blk,
158 block_job_attached_aio_context,
159 block_job_detach_aio_context, job);
160 blk_unref(job->blk);
161 error_free(job->blocker);
162 g_free(job->id);
163 QLIST_REMOVE(job, job_list);
164 g_free(job);
168 static void block_job_attached_aio_context(AioContext *new_context,
169 void *opaque)
171 BlockJob *job = opaque;
173 if (job->driver->attached_aio_context) {
174 job->driver->attached_aio_context(job, new_context);
177 block_job_resume(job);
180 static void block_job_drain(BlockJob *job)
182 /* If job is !job->busy this kicks it into the next pause point. */
183 block_job_enter(job);
185 blk_drain(job->blk);
186 if (job->driver->drain) {
187 job->driver->drain(job);
191 static void block_job_detach_aio_context(void *opaque)
193 BlockJob *job = opaque;
195 /* In case the job terminates during aio_poll()... */
196 block_job_ref(job);
198 block_job_pause(job);
200 while (!job->paused && !job->completed) {
201 block_job_drain(job);
204 block_job_unref(job);
207 static char *child_job_get_parent_desc(BdrvChild *c)
209 BlockJob *job = c->opaque;
210 return g_strdup_printf("%s job '%s'",
211 BlockJobType_lookup[job->driver->job_type],
212 job->id);
215 static const BdrvChildRole child_job = {
216 .get_parent_desc = child_job_get_parent_desc,
217 .stay_at_node = true,
220 static void block_job_drained_begin(void *opaque)
222 BlockJob *job = opaque;
223 block_job_pause(job);
226 static void block_job_drained_end(void *opaque)
228 BlockJob *job = opaque;
229 block_job_resume(job);
232 static const BlockDevOps block_job_dev_ops = {
233 .drained_begin = block_job_drained_begin,
234 .drained_end = block_job_drained_end,
237 void block_job_remove_all_bdrv(BlockJob *job)
239 GSList *l;
240 for (l = job->nodes; l; l = l->next) {
241 BdrvChild *c = l->data;
242 bdrv_op_unblock_all(c->bs, job->blocker);
243 bdrv_root_unref_child(c);
245 g_slist_free(job->nodes);
246 job->nodes = NULL;
249 int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
250 uint64_t perm, uint64_t shared_perm, Error **errp)
252 BdrvChild *c;
254 c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm,
255 job, errp);
256 if (c == NULL) {
257 return -EPERM;
260 job->nodes = g_slist_prepend(job->nodes, c);
261 bdrv_ref(bs);
262 bdrv_op_block_all(bs, job->blocker);
264 return 0;
267 bool block_job_is_internal(BlockJob *job)
269 return (job->id == NULL);
272 static bool block_job_started(BlockJob *job)
274 return job->co;
278 * All jobs must allow a pause point before entering their job proper. This
279 * ensures that jobs can be paused prior to being started, then resumed later.
281 static void coroutine_fn block_job_co_entry(void *opaque)
283 BlockJob *job = opaque;
285 assert(job && job->driver && job->driver->start);
286 block_job_pause_point(job);
287 job->driver->start(job);
290 void block_job_start(BlockJob *job)
292 assert(job && !block_job_started(job) && job->paused &&
293 job->driver && job->driver->start);
294 job->co = qemu_coroutine_create(block_job_co_entry, job);
295 job->pause_count--;
296 job->busy = true;
297 job->paused = false;
298 bdrv_coroutine_enter(blk_bs(job->blk), job->co);
301 static void block_job_completed_single(BlockJob *job)
303 assert(job->completed);
305 if (!job->ret) {
306 if (job->driver->commit) {
307 job->driver->commit(job);
309 } else {
310 if (job->driver->abort) {
311 job->driver->abort(job);
314 if (job->driver->clean) {
315 job->driver->clean(job);
318 if (job->cb) {
319 job->cb(job->opaque, job->ret);
322 /* Emit events only if we actually started */
323 if (block_job_started(job)) {
324 if (block_job_is_cancelled(job)) {
325 block_job_event_cancelled(job);
326 } else {
327 const char *msg = NULL;
328 if (job->ret < 0) {
329 msg = strerror(-job->ret);
331 block_job_event_completed(job, msg);
335 if (job->txn) {
336 QLIST_REMOVE(job, txn_list);
337 block_job_txn_unref(job->txn);
339 block_job_unref(job);
342 static void block_job_cancel_async(BlockJob *job)
344 if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) {
345 block_job_iostatus_reset(job);
347 if (job->user_paused) {
348 /* Do not call block_job_enter here, the caller will handle it. */
349 job->user_paused = false;
350 job->pause_count--;
352 job->cancelled = true;
355 static int block_job_finish_sync(BlockJob *job,
356 void (*finish)(BlockJob *, Error **errp),
357 Error **errp)
359 Error *local_err = NULL;
360 int ret;
362 assert(blk_bs(job->blk)->job == job);
364 block_job_ref(job);
366 if (finish) {
367 finish(job, &local_err);
369 if (local_err) {
370 error_propagate(errp, local_err);
371 block_job_unref(job);
372 return -EBUSY;
374 /* block_job_drain calls block_job_enter, and it should be enough to
375 * induce progress until the job completes or moves to the main thread.
377 while (!job->deferred_to_main_loop && !job->completed) {
378 block_job_drain(job);
380 while (!job->completed) {
381 aio_poll(qemu_get_aio_context(), true);
383 ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
384 block_job_unref(job);
385 return ret;
388 static void block_job_completed_txn_abort(BlockJob *job)
390 AioContext *ctx;
391 BlockJobTxn *txn = job->txn;
392 BlockJob *other_job;
394 if (txn->aborting) {
396 * We are cancelled by another job, which will handle everything.
398 return;
400 txn->aborting = true;
401 block_job_txn_ref(txn);
403 /* We are the first failed job. Cancel other jobs. */
404 QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
405 ctx = blk_get_aio_context(other_job->blk);
406 aio_context_acquire(ctx);
409 /* Other jobs are effectively cancelled by us, set the status for
410 * them; this job, however, may or may not be cancelled, depending
411 * on the caller, so leave it. */
412 QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
413 if (other_job != job) {
414 block_job_cancel_async(other_job);
417 while (!QLIST_EMPTY(&txn->jobs)) {
418 other_job = QLIST_FIRST(&txn->jobs);
419 ctx = blk_get_aio_context(other_job->blk);
420 if (!other_job->completed) {
421 assert(other_job->cancelled);
422 block_job_finish_sync(other_job, NULL, NULL);
424 block_job_completed_single(other_job);
425 aio_context_release(ctx);
428 block_job_txn_unref(txn);
431 static void block_job_completed_txn_success(BlockJob *job)
433 AioContext *ctx;
434 BlockJobTxn *txn = job->txn;
435 BlockJob *other_job, *next;
437 * Successful completion, see if there are other running jobs in this
438 * txn.
440 QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
441 if (!other_job->completed) {
442 return;
445 /* We are the last completed job, commit the transaction. */
446 QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
447 ctx = blk_get_aio_context(other_job->blk);
448 aio_context_acquire(ctx);
449 assert(other_job->ret == 0);
450 block_job_completed_single(other_job);
451 aio_context_release(ctx);
455 void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
457 Error *local_err = NULL;
459 if (!job->driver->set_speed) {
460 error_setg(errp, QERR_UNSUPPORTED);
461 return;
463 job->driver->set_speed(job, speed, &local_err);
464 if (local_err) {
465 error_propagate(errp, local_err);
466 return;
469 job->speed = speed;
472 void block_job_complete(BlockJob *job, Error **errp)
474 /* Should not be reachable via external interface for internal jobs */
475 assert(job->id);
476 if (job->pause_count || job->cancelled ||
477 !block_job_started(job) || !job->driver->complete) {
478 error_setg(errp, "The active block job '%s' cannot be completed",
479 job->id);
480 return;
483 job->driver->complete(job, errp);
486 void block_job_user_pause(BlockJob *job)
488 job->user_paused = true;
489 block_job_pause(job);
492 bool block_job_user_paused(BlockJob *job)
494 return job->user_paused;
497 void block_job_user_resume(BlockJob *job)
499 if (job && job->user_paused && job->pause_count > 0) {
500 block_job_iostatus_reset(job);
501 job->user_paused = false;
502 block_job_resume(job);
506 void block_job_cancel(BlockJob *job)
508 if (block_job_started(job)) {
509 block_job_cancel_async(job);
510 block_job_enter(job);
511 } else {
512 block_job_completed(job, -ECANCELED);
516 /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
517 * used with block_job_finish_sync() without the need for (rather nasty)
518 * function pointer casts there. */
519 static void block_job_cancel_err(BlockJob *job, Error **errp)
521 block_job_cancel(job);
524 int block_job_cancel_sync(BlockJob *job)
526 return block_job_finish_sync(job, &block_job_cancel_err, NULL);
529 void block_job_cancel_sync_all(void)
531 BlockJob *job;
532 AioContext *aio_context;
534 while ((job = QLIST_FIRST(&block_jobs))) {
535 aio_context = blk_get_aio_context(job->blk);
536 aio_context_acquire(aio_context);
537 block_job_cancel_sync(job);
538 aio_context_release(aio_context);
542 int block_job_complete_sync(BlockJob *job, Error **errp)
544 return block_job_finish_sync(job, &block_job_complete, errp);
547 BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
549 BlockJobInfo *info;
551 if (block_job_is_internal(job)) {
552 error_setg(errp, "Cannot query QEMU internal jobs");
553 return NULL;
555 info = g_new0(BlockJobInfo, 1);
556 info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]);
557 info->device = g_strdup(job->id);
558 info->len = job->len;
559 info->busy = job->busy;
560 info->paused = job->pause_count > 0;
561 info->offset = job->offset;
562 info->speed = job->speed;
563 info->io_status = job->iostatus;
564 info->ready = job->ready;
565 return info;
568 static void block_job_iostatus_set_err(BlockJob *job, int error)
570 if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
571 job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
572 BLOCK_DEVICE_IO_STATUS_FAILED;
576 static void block_job_event_cancelled(BlockJob *job)
578 if (block_job_is_internal(job)) {
579 return;
582 qapi_event_send_block_job_cancelled(job->driver->job_type,
583 job->id,
584 job->len,
585 job->offset,
586 job->speed,
587 &error_abort);
590 static void block_job_event_completed(BlockJob *job, const char *msg)
592 if (block_job_is_internal(job)) {
593 return;
596 qapi_event_send_block_job_completed(job->driver->job_type,
597 job->id,
598 job->len,
599 job->offset,
600 job->speed,
601 !!msg,
602 msg,
603 &error_abort);
607 * API for block job drivers and the block layer. These functions are
608 * declared in blockjob_int.h.
611 void *block_job_create(const char *job_id, const BlockJobDriver *driver,
612 BlockDriverState *bs, uint64_t perm,
613 uint64_t shared_perm, int64_t speed, int flags,
614 BlockCompletionFunc *cb, void *opaque, Error **errp)
616 BlockBackend *blk;
617 BlockJob *job;
618 int ret;
620 if (bs->job) {
621 error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
622 return NULL;
625 if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) {
626 job_id = bdrv_get_device_name(bs);
627 if (!*job_id) {
628 error_setg(errp, "An explicit job ID is required for this node");
629 return NULL;
633 if (job_id) {
634 if (flags & BLOCK_JOB_INTERNAL) {
635 error_setg(errp, "Cannot specify job ID for internal block job");
636 return NULL;
639 if (!id_wellformed(job_id)) {
640 error_setg(errp, "Invalid job ID '%s'", job_id);
641 return NULL;
644 if (block_job_get(job_id)) {
645 error_setg(errp, "Job ID '%s' already in use", job_id);
646 return NULL;
650 blk = blk_new(perm, shared_perm);
651 ret = blk_insert_bs(blk, bs, errp);
652 if (ret < 0) {
653 blk_unref(blk);
654 return NULL;
657 job = g_malloc0(driver->instance_size);
658 job->driver = driver;
659 job->id = g_strdup(job_id);
660 job->blk = blk;
661 job->cb = cb;
662 job->opaque = opaque;
663 job->busy = false;
664 job->paused = true;
665 job->pause_count = 1;
666 job->refcnt = 1;
668 error_setg(&job->blocker, "block device is in use by block job: %s",
669 BlockJobType_lookup[driver->job_type]);
670 block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort);
671 bs->job = job;
673 blk_set_dev_ops(blk, &block_job_dev_ops, job);
674 bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
676 QLIST_INSERT_HEAD(&block_jobs, job, job_list);
678 blk_add_aio_context_notifier(blk, block_job_attached_aio_context,
679 block_job_detach_aio_context, job);
681 /* Only set speed when necessary to avoid NotSupported error */
682 if (speed != 0) {
683 Error *local_err = NULL;
685 block_job_set_speed(job, speed, &local_err);
686 if (local_err) {
687 block_job_unref(job);
688 error_propagate(errp, local_err);
689 return NULL;
692 return job;
695 void block_job_pause_all(void)
697 BlockJob *job = NULL;
698 while ((job = block_job_next(job))) {
699 AioContext *aio_context = blk_get_aio_context(job->blk);
701 aio_context_acquire(aio_context);
702 block_job_pause(job);
703 aio_context_release(aio_context);
707 void block_job_early_fail(BlockJob *job)
709 block_job_unref(job);
712 void block_job_completed(BlockJob *job, int ret)
714 assert(blk_bs(job->blk)->job == job);
715 assert(!job->completed);
716 job->completed = true;
717 job->ret = ret;
718 if (!job->txn) {
719 block_job_completed_single(job);
720 } else if (ret < 0 || block_job_is_cancelled(job)) {
721 block_job_completed_txn_abort(job);
722 } else {
723 block_job_completed_txn_success(job);
727 static bool block_job_should_pause(BlockJob *job)
729 return job->pause_count > 0;
732 void coroutine_fn block_job_pause_point(BlockJob *job)
734 assert(job && block_job_started(job));
736 if (!block_job_should_pause(job)) {
737 return;
739 if (block_job_is_cancelled(job)) {
740 return;
743 if (job->driver->pause) {
744 job->driver->pause(job);
747 if (block_job_should_pause(job) && !block_job_is_cancelled(job)) {
748 job->paused = true;
749 job->busy = false;
750 qemu_coroutine_yield(); /* wait for block_job_resume() */
751 job->busy = true;
752 job->paused = false;
755 if (job->driver->resume) {
756 job->driver->resume(job);
760 void block_job_resume_all(void)
762 BlockJob *job = NULL;
763 while ((job = block_job_next(job))) {
764 AioContext *aio_context = blk_get_aio_context(job->blk);
766 aio_context_acquire(aio_context);
767 block_job_resume(job);
768 aio_context_release(aio_context);
772 void block_job_enter(BlockJob *job)
774 if (!block_job_started(job)) {
775 return;
777 if (job->deferred_to_main_loop) {
778 return;
781 if (!job->busy) {
782 bdrv_coroutine_enter(blk_bs(job->blk), job->co);
786 bool block_job_is_cancelled(BlockJob *job)
788 return job->cancelled;
791 void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
793 assert(job->busy);
795 /* Check cancellation *before* setting busy = false, too! */
796 if (block_job_is_cancelled(job)) {
797 return;
800 job->busy = false;
801 if (!block_job_should_pause(job)) {
802 co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns);
804 job->busy = true;
806 block_job_pause_point(job);
809 void block_job_yield(BlockJob *job)
811 assert(job->busy);
813 /* Check cancellation *before* setting busy = false, too! */
814 if (block_job_is_cancelled(job)) {
815 return;
818 job->busy = false;
819 if (!block_job_should_pause(job)) {
820 qemu_coroutine_yield();
822 job->busy = true;
824 block_job_pause_point(job);
827 void block_job_iostatus_reset(BlockJob *job)
829 if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
830 return;
832 assert(job->user_paused && job->pause_count > 0);
833 job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
836 void block_job_event_ready(BlockJob *job)
838 job->ready = true;
840 if (block_job_is_internal(job)) {
841 return;
844 qapi_event_send_block_job_ready(job->driver->job_type,
845 job->id,
846 job->len,
847 job->offset,
848 job->speed, &error_abort);
851 BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
852 int is_read, int error)
854 BlockErrorAction action;
856 switch (on_err) {
857 case BLOCKDEV_ON_ERROR_ENOSPC:
858 case BLOCKDEV_ON_ERROR_AUTO:
859 action = (error == ENOSPC) ?
860 BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
861 break;
862 case BLOCKDEV_ON_ERROR_STOP:
863 action = BLOCK_ERROR_ACTION_STOP;
864 break;
865 case BLOCKDEV_ON_ERROR_REPORT:
866 action = BLOCK_ERROR_ACTION_REPORT;
867 break;
868 case BLOCKDEV_ON_ERROR_IGNORE:
869 action = BLOCK_ERROR_ACTION_IGNORE;
870 break;
871 default:
872 abort();
874 if (!block_job_is_internal(job)) {
875 qapi_event_send_block_job_error(job->id,
876 is_read ? IO_OPERATION_TYPE_READ :
877 IO_OPERATION_TYPE_WRITE,
878 action, &error_abort);
880 if (action == BLOCK_ERROR_ACTION_STOP) {
881 /* make the pause user visible, which will be resumed from QMP. */
882 block_job_user_pause(job);
883 block_job_iostatus_set_err(job, error);
885 return action;
888 typedef struct {
889 BlockJob *job;
890 AioContext *aio_context;
891 BlockJobDeferToMainLoopFn *fn;
892 void *opaque;
893 } BlockJobDeferToMainLoopData;
895 static void block_job_defer_to_main_loop_bh(void *opaque)
897 BlockJobDeferToMainLoopData *data = opaque;
898 AioContext *aio_context;
900 /* Prevent race with block_job_defer_to_main_loop() */
901 aio_context_acquire(data->aio_context);
903 /* Fetch BDS AioContext again, in case it has changed */
904 aio_context = blk_get_aio_context(data->job->blk);
905 if (aio_context != data->aio_context) {
906 aio_context_acquire(aio_context);
909 data->fn(data->job, data->opaque);
911 if (aio_context != data->aio_context) {
912 aio_context_release(aio_context);
915 aio_context_release(data->aio_context);
917 g_free(data);
920 void block_job_defer_to_main_loop(BlockJob *job,
921 BlockJobDeferToMainLoopFn *fn,
922 void *opaque)
924 BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data));
925 data->job = job;
926 data->aio_context = blk_get_aio_context(job->blk);
927 data->fn = fn;
928 data->opaque = opaque;
929 job->deferred_to_main_loop = true;
931 aio_bh_schedule_oneshot(qemu_get_aio_context(),
932 block_job_defer_to_main_loop_bh, data);