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
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"
36 #include "qmp-commands.h"
37 #include "qemu/timer.h"
38 #include "qapi-event.h"
40 /* Right now, this mutex is only needed to synchronize accesses to job->busy
41 * and job->sleep_timer, such as concurrent calls to block_job_do_yield and
43 static QemuMutex block_job_mutex
;
45 static void block_job_lock(void)
47 qemu_mutex_lock(&block_job_mutex
);
50 static void block_job_unlock(void)
52 qemu_mutex_unlock(&block_job_mutex
);
55 static void __attribute__((__constructor__
)) block_job_init(void)
57 qemu_mutex_init(&block_job_mutex
);
60 static void block_job_event_cancelled(BlockJob
*job
);
61 static void block_job_event_completed(BlockJob
*job
, const char *msg
);
62 static void block_job_enter_cond(BlockJob
*job
, bool(*fn
)(BlockJob
*job
));
64 /* Transactional group of block jobs */
67 /* Is this txn being cancelled? */
71 QLIST_HEAD(, BlockJob
) jobs
;
77 static QLIST_HEAD(, BlockJob
) block_jobs
= QLIST_HEAD_INITIALIZER(block_jobs
);
80 * The block job API is composed of two categories of functions.
82 * The first includes functions used by the monitor. The monitor is
83 * peculiar in that it accesses the block job list with block_job_get, and
84 * therefore needs consistency across block_job_get and the actual operation
85 * (e.g. block_job_set_speed). The consistency is achieved with
86 * aio_context_acquire/release. These functions are declared in blockjob.h.
88 * The second includes functions used by the block job drivers and sometimes
89 * by the core block layer. These do not care about locking, because the
90 * whole coroutine runs under the AioContext lock, and are declared in
94 BlockJob
*block_job_next(BlockJob
*job
)
97 return QLIST_FIRST(&block_jobs
);
99 return QLIST_NEXT(job
, job_list
);
102 BlockJob
*block_job_get(const char *id
)
106 QLIST_FOREACH(job
, &block_jobs
, job_list
) {
107 if (job
->id
&& !strcmp(id
, job
->id
)) {
115 BlockJobTxn
*block_job_txn_new(void)
117 BlockJobTxn
*txn
= g_new0(BlockJobTxn
, 1);
118 QLIST_INIT(&txn
->jobs
);
123 static void block_job_txn_ref(BlockJobTxn
*txn
)
128 void block_job_txn_unref(BlockJobTxn
*txn
)
130 if (txn
&& --txn
->refcnt
== 0) {
135 void block_job_txn_add_job(BlockJobTxn
*txn
, BlockJob
*job
)
144 QLIST_INSERT_HEAD(&txn
->jobs
, job
, txn_list
);
145 block_job_txn_ref(txn
);
148 static void block_job_pause(BlockJob
*job
)
153 static void block_job_resume(BlockJob
*job
)
155 assert(job
->pause_count
> 0);
157 if (job
->pause_count
) {
160 block_job_enter(job
);
163 void block_job_ref(BlockJob
*job
)
168 static void block_job_attached_aio_context(AioContext
*new_context
,
170 static void block_job_detach_aio_context(void *opaque
);
172 void block_job_unref(BlockJob
*job
)
174 if (--job
->refcnt
== 0) {
175 BlockDriverState
*bs
= blk_bs(job
->blk
);
176 QLIST_REMOVE(job
, job_list
);
178 block_job_remove_all_bdrv(job
);
179 blk_remove_aio_context_notifier(job
->blk
,
180 block_job_attached_aio_context
,
181 block_job_detach_aio_context
, job
);
183 error_free(job
->blocker
);
185 assert(!timer_pending(&job
->sleep_timer
));
190 static void block_job_attached_aio_context(AioContext
*new_context
,
193 BlockJob
*job
= opaque
;
195 if (job
->driver
->attached_aio_context
) {
196 job
->driver
->attached_aio_context(job
, new_context
);
199 block_job_resume(job
);
202 static void block_job_drain(BlockJob
*job
)
204 /* If job is !job->busy this kicks it into the next pause point. */
205 block_job_enter(job
);
208 if (job
->driver
->drain
) {
209 job
->driver
->drain(job
);
213 static void block_job_detach_aio_context(void *opaque
)
215 BlockJob
*job
= opaque
;
217 /* In case the job terminates during aio_poll()... */
220 block_job_pause(job
);
222 while (!job
->paused
&& !job
->completed
) {
223 block_job_drain(job
);
226 block_job_unref(job
);
229 static char *child_job_get_parent_desc(BdrvChild
*c
)
231 BlockJob
*job
= c
->opaque
;
232 return g_strdup_printf("%s job '%s'",
233 BlockJobType_str(job
->driver
->job_type
),
237 static const BdrvChildRole child_job
= {
238 .get_parent_desc
= child_job_get_parent_desc
,
239 .stay_at_node
= true,
242 static void block_job_drained_begin(void *opaque
)
244 BlockJob
*job
= opaque
;
245 block_job_pause(job
);
248 static void block_job_drained_end(void *opaque
)
250 BlockJob
*job
= opaque
;
251 block_job_resume(job
);
254 static const BlockDevOps block_job_dev_ops
= {
255 .drained_begin
= block_job_drained_begin
,
256 .drained_end
= block_job_drained_end
,
259 void block_job_remove_all_bdrv(BlockJob
*job
)
262 for (l
= job
->nodes
; l
; l
= l
->next
) {
263 BdrvChild
*c
= l
->data
;
264 bdrv_op_unblock_all(c
->bs
, job
->blocker
);
265 bdrv_root_unref_child(c
);
267 g_slist_free(job
->nodes
);
271 int block_job_add_bdrv(BlockJob
*job
, const char *name
, BlockDriverState
*bs
,
272 uint64_t perm
, uint64_t shared_perm
, Error
**errp
)
276 c
= bdrv_root_attach_child(bs
, name
, &child_job
, perm
, shared_perm
,
282 job
->nodes
= g_slist_prepend(job
->nodes
, c
);
284 bdrv_op_block_all(bs
, job
->blocker
);
289 bool block_job_is_internal(BlockJob
*job
)
291 return (job
->id
== NULL
);
294 static bool block_job_started(BlockJob
*job
)
300 * All jobs must allow a pause point before entering their job proper. This
301 * ensures that jobs can be paused prior to being started, then resumed later.
303 static void coroutine_fn
block_job_co_entry(void *opaque
)
305 BlockJob
*job
= opaque
;
307 assert(job
&& job
->driver
&& job
->driver
->start
);
308 block_job_pause_point(job
);
309 job
->driver
->start(job
);
312 static void block_job_sleep_timer_cb(void *opaque
)
314 BlockJob
*job
= opaque
;
316 block_job_enter(job
);
319 void block_job_start(BlockJob
*job
)
321 assert(job
&& !block_job_started(job
) && job
->paused
&&
322 job
->driver
&& job
->driver
->start
);
323 job
->co
= qemu_coroutine_create(block_job_co_entry
, job
);
327 bdrv_coroutine_enter(blk_bs(job
->blk
), job
->co
);
330 static void block_job_completed_single(BlockJob
*job
)
332 assert(job
->completed
);
335 if (job
->driver
->commit
) {
336 job
->driver
->commit(job
);
339 if (job
->driver
->abort
) {
340 job
->driver
->abort(job
);
343 if (job
->driver
->clean
) {
344 job
->driver
->clean(job
);
348 job
->cb(job
->opaque
, job
->ret
);
351 /* Emit events only if we actually started */
352 if (block_job_started(job
)) {
353 if (block_job_is_cancelled(job
)) {
354 block_job_event_cancelled(job
);
356 const char *msg
= NULL
;
358 msg
= strerror(-job
->ret
);
360 block_job_event_completed(job
, msg
);
365 QLIST_REMOVE(job
, txn_list
);
366 block_job_txn_unref(job
->txn
);
368 block_job_unref(job
);
371 static void block_job_cancel_async(BlockJob
*job
)
373 if (job
->iostatus
!= BLOCK_DEVICE_IO_STATUS_OK
) {
374 block_job_iostatus_reset(job
);
376 if (job
->user_paused
) {
377 /* Do not call block_job_enter here, the caller will handle it. */
378 job
->user_paused
= false;
381 job
->cancelled
= true;
384 static int block_job_finish_sync(BlockJob
*job
,
385 void (*finish
)(BlockJob
*, Error
**errp
),
388 Error
*local_err
= NULL
;
391 assert(blk_bs(job
->blk
)->job
== job
);
396 finish(job
, &local_err
);
399 error_propagate(errp
, local_err
);
400 block_job_unref(job
);
403 /* block_job_drain calls block_job_enter, and it should be enough to
404 * induce progress until the job completes or moves to the main thread.
406 while (!job
->deferred_to_main_loop
&& !job
->completed
) {
407 block_job_drain(job
);
409 while (!job
->completed
) {
410 aio_poll(qemu_get_aio_context(), true);
412 ret
= (job
->cancelled
&& job
->ret
== 0) ? -ECANCELED
: job
->ret
;
413 block_job_unref(job
);
417 static void block_job_completed_txn_abort(BlockJob
*job
)
420 BlockJobTxn
*txn
= job
->txn
;
425 * We are cancelled by another job, which will handle everything.
429 txn
->aborting
= true;
430 block_job_txn_ref(txn
);
432 /* We are the first failed job. Cancel other jobs. */
433 QLIST_FOREACH(other_job
, &txn
->jobs
, txn_list
) {
434 ctx
= blk_get_aio_context(other_job
->blk
);
435 aio_context_acquire(ctx
);
438 /* Other jobs are effectively cancelled by us, set the status for
439 * them; this job, however, may or may not be cancelled, depending
440 * on the caller, so leave it. */
441 QLIST_FOREACH(other_job
, &txn
->jobs
, txn_list
) {
442 if (other_job
!= job
) {
443 block_job_cancel_async(other_job
);
446 while (!QLIST_EMPTY(&txn
->jobs
)) {
447 other_job
= QLIST_FIRST(&txn
->jobs
);
448 ctx
= blk_get_aio_context(other_job
->blk
);
449 if (!other_job
->completed
) {
450 assert(other_job
->cancelled
);
451 block_job_finish_sync(other_job
, NULL
, NULL
);
453 block_job_completed_single(other_job
);
454 aio_context_release(ctx
);
457 block_job_txn_unref(txn
);
460 static void block_job_completed_txn_success(BlockJob
*job
)
463 BlockJobTxn
*txn
= job
->txn
;
464 BlockJob
*other_job
, *next
;
466 * Successful completion, see if there are other running jobs in this
469 QLIST_FOREACH(other_job
, &txn
->jobs
, txn_list
) {
470 if (!other_job
->completed
) {
474 /* We are the last completed job, commit the transaction. */
475 QLIST_FOREACH_SAFE(other_job
, &txn
->jobs
, txn_list
, next
) {
476 ctx
= blk_get_aio_context(other_job
->blk
);
477 aio_context_acquire(ctx
);
478 assert(other_job
->ret
== 0);
479 block_job_completed_single(other_job
);
480 aio_context_release(ctx
);
484 /* Assumes the block_job_mutex is held */
485 static bool block_job_timer_pending(BlockJob
*job
)
487 return timer_pending(&job
->sleep_timer
);
490 void block_job_set_speed(BlockJob
*job
, int64_t speed
, Error
**errp
)
492 Error
*local_err
= NULL
;
493 int64_t old_speed
= job
->speed
;
495 if (!job
->driver
->set_speed
) {
496 error_setg(errp
, QERR_UNSUPPORTED
);
499 job
->driver
->set_speed(job
, speed
, &local_err
);
501 error_propagate(errp
, local_err
);
506 if (speed
<= old_speed
) {
510 /* kick only if a timer is pending */
511 block_job_enter_cond(job
, block_job_timer_pending
);
514 void block_job_complete(BlockJob
*job
, Error
**errp
)
516 /* Should not be reachable via external interface for internal jobs */
518 if (job
->pause_count
|| job
->cancelled
||
519 !block_job_started(job
) || !job
->driver
->complete
) {
520 error_setg(errp
, "The active block job '%s' cannot be completed",
525 job
->driver
->complete(job
, errp
);
528 void block_job_user_pause(BlockJob
*job
)
530 job
->user_paused
= true;
531 block_job_pause(job
);
534 bool block_job_user_paused(BlockJob
*job
)
536 return job
->user_paused
;
539 void block_job_user_resume(BlockJob
*job
)
541 if (job
&& job
->user_paused
&& job
->pause_count
> 0) {
542 block_job_iostatus_reset(job
);
543 job
->user_paused
= false;
544 block_job_resume(job
);
548 void block_job_cancel(BlockJob
*job
)
550 if (block_job_started(job
)) {
551 block_job_cancel_async(job
);
552 block_job_enter(job
);
554 block_job_completed(job
, -ECANCELED
);
558 /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
559 * used with block_job_finish_sync() without the need for (rather nasty)
560 * function pointer casts there. */
561 static void block_job_cancel_err(BlockJob
*job
, Error
**errp
)
563 block_job_cancel(job
);
566 int block_job_cancel_sync(BlockJob
*job
)
568 return block_job_finish_sync(job
, &block_job_cancel_err
, NULL
);
571 void block_job_cancel_sync_all(void)
574 AioContext
*aio_context
;
576 while ((job
= QLIST_FIRST(&block_jobs
))) {
577 aio_context
= blk_get_aio_context(job
->blk
);
578 aio_context_acquire(aio_context
);
579 block_job_cancel_sync(job
);
580 aio_context_release(aio_context
);
584 int block_job_complete_sync(BlockJob
*job
, Error
**errp
)
586 return block_job_finish_sync(job
, &block_job_complete
, errp
);
589 BlockJobInfo
*block_job_query(BlockJob
*job
, Error
**errp
)
593 if (block_job_is_internal(job
)) {
594 error_setg(errp
, "Cannot query QEMU internal jobs");
597 info
= g_new0(BlockJobInfo
, 1);
598 info
->type
= g_strdup(BlockJobType_str(job
->driver
->job_type
));
599 info
->device
= g_strdup(job
->id
);
600 info
->len
= job
->len
;
601 info
->busy
= atomic_read(&job
->busy
);
602 info
->paused
= job
->pause_count
> 0;
603 info
->offset
= job
->offset
;
604 info
->speed
= job
->speed
;
605 info
->io_status
= job
->iostatus
;
606 info
->ready
= job
->ready
;
610 static void block_job_iostatus_set_err(BlockJob
*job
, int error
)
612 if (job
->iostatus
== BLOCK_DEVICE_IO_STATUS_OK
) {
613 job
->iostatus
= error
== ENOSPC
? BLOCK_DEVICE_IO_STATUS_NOSPACE
:
614 BLOCK_DEVICE_IO_STATUS_FAILED
;
618 static void block_job_event_cancelled(BlockJob
*job
)
620 if (block_job_is_internal(job
)) {
624 qapi_event_send_block_job_cancelled(job
->driver
->job_type
,
632 static void block_job_event_completed(BlockJob
*job
, const char *msg
)
634 if (block_job_is_internal(job
)) {
638 qapi_event_send_block_job_completed(job
->driver
->job_type
,
649 * API for block job drivers and the block layer. These functions are
650 * declared in blockjob_int.h.
653 void *block_job_create(const char *job_id
, const BlockJobDriver
*driver
,
654 BlockDriverState
*bs
, uint64_t perm
,
655 uint64_t shared_perm
, int64_t speed
, int flags
,
656 BlockCompletionFunc
*cb
, void *opaque
, Error
**errp
)
663 error_setg(errp
, QERR_DEVICE_IN_USE
, bdrv_get_device_name(bs
));
667 if (job_id
== NULL
&& !(flags
& BLOCK_JOB_INTERNAL
)) {
668 job_id
= bdrv_get_device_name(bs
);
670 error_setg(errp
, "An explicit job ID is required for this node");
676 if (flags
& BLOCK_JOB_INTERNAL
) {
677 error_setg(errp
, "Cannot specify job ID for internal block job");
681 if (!id_wellformed(job_id
)) {
682 error_setg(errp
, "Invalid job ID '%s'", job_id
);
686 if (block_job_get(job_id
)) {
687 error_setg(errp
, "Job ID '%s' already in use", job_id
);
692 blk
= blk_new(perm
, shared_perm
);
693 ret
= blk_insert_bs(blk
, bs
, errp
);
699 job
= g_malloc0(driver
->instance_size
);
700 job
->driver
= driver
;
701 job
->id
= g_strdup(job_id
);
704 job
->opaque
= opaque
;
707 job
->pause_count
= 1;
709 aio_timer_init(qemu_get_aio_context(), &job
->sleep_timer
,
710 QEMU_CLOCK_REALTIME
, SCALE_NS
,
711 block_job_sleep_timer_cb
, job
);
713 error_setg(&job
->blocker
, "block device is in use by block job: %s",
714 BlockJobType_str(driver
->job_type
));
715 block_job_add_bdrv(job
, "main node", bs
, 0, BLK_PERM_ALL
, &error_abort
);
718 blk_set_dev_ops(blk
, &block_job_dev_ops
, job
);
719 bdrv_op_unblock(bs
, BLOCK_OP_TYPE_DATAPLANE
, job
->blocker
);
721 QLIST_INSERT_HEAD(&block_jobs
, job
, job_list
);
723 blk_add_aio_context_notifier(blk
, block_job_attached_aio_context
,
724 block_job_detach_aio_context
, job
);
726 /* Only set speed when necessary to avoid NotSupported error */
728 Error
*local_err
= NULL
;
730 block_job_set_speed(job
, speed
, &local_err
);
732 block_job_unref(job
);
733 error_propagate(errp
, local_err
);
740 void block_job_pause_all(void)
742 BlockJob
*job
= NULL
;
743 while ((job
= block_job_next(job
))) {
744 AioContext
*aio_context
= blk_get_aio_context(job
->blk
);
746 aio_context_acquire(aio_context
);
748 block_job_pause(job
);
749 aio_context_release(aio_context
);
753 void block_job_early_fail(BlockJob
*job
)
755 block_job_unref(job
);
758 void block_job_completed(BlockJob
*job
, int ret
)
760 assert(blk_bs(job
->blk
)->job
== job
);
761 assert(!job
->completed
);
762 job
->completed
= true;
765 block_job_completed_single(job
);
766 } else if (ret
< 0 || block_job_is_cancelled(job
)) {
767 block_job_completed_txn_abort(job
);
769 block_job_completed_txn_success(job
);
773 static bool block_job_should_pause(BlockJob
*job
)
775 return job
->pause_count
> 0;
778 /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds.
779 * Reentering the job coroutine with block_job_enter() before the timer has
780 * expired is allowed and cancels the timer.
782 * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be
783 * called explicitly. */
784 static void block_job_do_yield(BlockJob
*job
, uint64_t ns
)
788 timer_mod(&job
->sleep_timer
, ns
);
792 qemu_coroutine_yield();
794 /* Set by block_job_enter before re-entering the coroutine. */
798 void coroutine_fn
block_job_pause_point(BlockJob
*job
)
800 assert(job
&& block_job_started(job
));
802 if (!block_job_should_pause(job
)) {
805 if (block_job_is_cancelled(job
)) {
809 if (job
->driver
->pause
) {
810 job
->driver
->pause(job
);
813 if (block_job_should_pause(job
) && !block_job_is_cancelled(job
)) {
815 block_job_do_yield(job
, -1);
819 if (job
->driver
->resume
) {
820 job
->driver
->resume(job
);
824 void block_job_resume_all(void)
826 BlockJob
*job
, *next
;
828 QLIST_FOREACH_SAFE(job
, &block_jobs
, job_list
, next
) {
829 AioContext
*aio_context
= blk_get_aio_context(job
->blk
);
831 aio_context_acquire(aio_context
);
832 block_job_resume(job
);
833 block_job_unref(job
);
834 aio_context_release(aio_context
);
839 * Conditionally enter a block_job pending a call to fn() while
840 * under the block_job_lock critical section.
842 static void block_job_enter_cond(BlockJob
*job
, bool(*fn
)(BlockJob
*job
))
844 if (!block_job_started(job
)) {
847 if (job
->deferred_to_main_loop
) {
857 if (fn
&& !fn(job
)) {
862 assert(!job
->deferred_to_main_loop
);
863 timer_del(&job
->sleep_timer
);
866 aio_co_wake(job
->co
);
869 void block_job_enter(BlockJob
*job
)
871 block_job_enter_cond(job
, NULL
);
874 bool block_job_is_cancelled(BlockJob
*job
)
876 return job
->cancelled
;
879 void block_job_sleep_ns(BlockJob
*job
, int64_t ns
)
883 /* Check cancellation *before* setting busy = false, too! */
884 if (block_job_is_cancelled(job
)) {
888 if (!block_job_should_pause(job
)) {
889 block_job_do_yield(job
, qemu_clock_get_ns(QEMU_CLOCK_REALTIME
) + ns
);
892 block_job_pause_point(job
);
895 void block_job_yield(BlockJob
*job
)
899 /* Check cancellation *before* setting busy = false, too! */
900 if (block_job_is_cancelled(job
)) {
904 if (!block_job_should_pause(job
)) {
905 block_job_do_yield(job
, -1);
908 block_job_pause_point(job
);
911 void block_job_iostatus_reset(BlockJob
*job
)
913 if (job
->iostatus
== BLOCK_DEVICE_IO_STATUS_OK
) {
916 assert(job
->user_paused
&& job
->pause_count
> 0);
917 job
->iostatus
= BLOCK_DEVICE_IO_STATUS_OK
;
920 void block_job_event_ready(BlockJob
*job
)
924 if (block_job_is_internal(job
)) {
928 qapi_event_send_block_job_ready(job
->driver
->job_type
,
932 job
->speed
, &error_abort
);
935 BlockErrorAction
block_job_error_action(BlockJob
*job
, BlockdevOnError on_err
,
936 int is_read
, int error
)
938 BlockErrorAction action
;
941 case BLOCKDEV_ON_ERROR_ENOSPC
:
942 case BLOCKDEV_ON_ERROR_AUTO
:
943 action
= (error
== ENOSPC
) ?
944 BLOCK_ERROR_ACTION_STOP
: BLOCK_ERROR_ACTION_REPORT
;
946 case BLOCKDEV_ON_ERROR_STOP
:
947 action
= BLOCK_ERROR_ACTION_STOP
;
949 case BLOCKDEV_ON_ERROR_REPORT
:
950 action
= BLOCK_ERROR_ACTION_REPORT
;
952 case BLOCKDEV_ON_ERROR_IGNORE
:
953 action
= BLOCK_ERROR_ACTION_IGNORE
;
958 if (!block_job_is_internal(job
)) {
959 qapi_event_send_block_job_error(job
->id
,
960 is_read
? IO_OPERATION_TYPE_READ
:
961 IO_OPERATION_TYPE_WRITE
,
962 action
, &error_abort
);
964 if (action
== BLOCK_ERROR_ACTION_STOP
) {
965 /* make the pause user visible, which will be resumed from QMP. */
966 block_job_user_pause(job
);
967 block_job_iostatus_set_err(job
, error
);
974 AioContext
*aio_context
;
975 BlockJobDeferToMainLoopFn
*fn
;
977 } BlockJobDeferToMainLoopData
;
979 static void block_job_defer_to_main_loop_bh(void *opaque
)
981 BlockJobDeferToMainLoopData
*data
= opaque
;
982 AioContext
*aio_context
;
984 /* Prevent race with block_job_defer_to_main_loop() */
985 aio_context_acquire(data
->aio_context
);
987 /* Fetch BDS AioContext again, in case it has changed */
988 aio_context
= blk_get_aio_context(data
->job
->blk
);
989 if (aio_context
!= data
->aio_context
) {
990 aio_context_acquire(aio_context
);
993 data
->fn(data
->job
, data
->opaque
);
995 if (aio_context
!= data
->aio_context
) {
996 aio_context_release(aio_context
);
999 aio_context_release(data
->aio_context
);
1004 void block_job_defer_to_main_loop(BlockJob
*job
,
1005 BlockJobDeferToMainLoopFn
*fn
,
1008 BlockJobDeferToMainLoopData
*data
= g_malloc(sizeof(*data
));
1010 data
->aio_context
= blk_get_aio_context(job
->blk
);
1012 data
->opaque
= opaque
;
1013 job
->deferred_to_main_loop
= true;
1015 aio_bh_schedule_oneshot(qemu_get_aio_context(),
1016 block_job_defer_to_main_loop_bh
, data
);