qcow2: Check snapshot L1 table in qcow2_snapshot_goto()
[qemu/ar7.git] / blockjob.c
blob801d29d8496257dfe6dda0a0dab23be77f88a661
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/error.h"
33 #include "qapi/qapi-events-block-core.h"
34 #include "qapi/qmp/qerror.h"
35 #include "qemu/coroutine.h"
36 #include "qemu/id.h"
37 #include "qemu/timer.h"
39 /* Right now, this mutex is only needed to synchronize accesses to job->busy
40 * and job->sleep_timer, such as concurrent calls to block_job_do_yield and
41 * block_job_enter. */
42 static QemuMutex block_job_mutex;
44 static void block_job_lock(void)
46 qemu_mutex_lock(&block_job_mutex);
49 static void block_job_unlock(void)
51 qemu_mutex_unlock(&block_job_mutex);
54 static void __attribute__((__constructor__)) block_job_init(void)
56 qemu_mutex_init(&block_job_mutex);
59 static void block_job_event_cancelled(BlockJob *job);
60 static void block_job_event_completed(BlockJob *job, const char *msg);
61 static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job));
63 /* Transactional group of block jobs */
64 struct BlockJobTxn {
66 /* Is this txn being cancelled? */
67 bool aborting;
69 /* List of jobs */
70 QLIST_HEAD(, BlockJob) jobs;
72 /* Reference count */
73 int refcnt;
76 static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs);
79 * The block job API is composed of two categories of functions.
81 * The first includes functions used by the monitor. The monitor is
82 * peculiar in that it accesses the block job list with block_job_get, and
83 * therefore needs consistency across block_job_get and the actual operation
84 * (e.g. block_job_set_speed). The consistency is achieved with
85 * aio_context_acquire/release. These functions are declared in blockjob.h.
87 * The second includes functions used by the block job drivers and sometimes
88 * by the core block layer. These do not care about locking, because the
89 * whole coroutine runs under the AioContext lock, and are declared in
90 * blockjob_int.h.
93 BlockJob *block_job_next(BlockJob *job)
95 if (!job) {
96 return QLIST_FIRST(&block_jobs);
98 return QLIST_NEXT(job, job_list);
101 BlockJob *block_job_get(const char *id)
103 BlockJob *job;
105 QLIST_FOREACH(job, &block_jobs, job_list) {
106 if (job->id && !strcmp(id, job->id)) {
107 return job;
111 return NULL;
114 BlockJobTxn *block_job_txn_new(void)
116 BlockJobTxn *txn = g_new0(BlockJobTxn, 1);
117 QLIST_INIT(&txn->jobs);
118 txn->refcnt = 1;
119 return txn;
122 static void block_job_txn_ref(BlockJobTxn *txn)
124 txn->refcnt++;
127 void block_job_txn_unref(BlockJobTxn *txn)
129 if (txn && --txn->refcnt == 0) {
130 g_free(txn);
134 void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job)
136 if (!txn) {
137 return;
140 assert(!job->txn);
141 job->txn = txn;
143 QLIST_INSERT_HEAD(&txn->jobs, job, txn_list);
144 block_job_txn_ref(txn);
147 static void block_job_pause(BlockJob *job)
149 job->pause_count++;
152 static void block_job_resume(BlockJob *job)
154 assert(job->pause_count > 0);
155 job->pause_count--;
156 if (job->pause_count) {
157 return;
159 block_job_enter(job);
162 void block_job_ref(BlockJob *job)
164 ++job->refcnt;
167 static void block_job_attached_aio_context(AioContext *new_context,
168 void *opaque);
169 static void block_job_detach_aio_context(void *opaque);
171 void block_job_unref(BlockJob *job)
173 if (--job->refcnt == 0) {
174 BlockDriverState *bs = blk_bs(job->blk);
175 QLIST_REMOVE(job, job_list);
176 bs->job = NULL;
177 block_job_remove_all_bdrv(job);
178 blk_remove_aio_context_notifier(job->blk,
179 block_job_attached_aio_context,
180 block_job_detach_aio_context, job);
181 blk_unref(job->blk);
182 error_free(job->blocker);
183 g_free(job->id);
184 assert(!timer_pending(&job->sleep_timer));
185 g_free(job);
189 static void block_job_attached_aio_context(AioContext *new_context,
190 void *opaque)
192 BlockJob *job = opaque;
194 if (job->driver->attached_aio_context) {
195 job->driver->attached_aio_context(job, new_context);
198 block_job_resume(job);
201 static void block_job_drain(BlockJob *job)
203 /* If job is !job->busy this kicks it into the next pause point. */
204 block_job_enter(job);
206 blk_drain(job->blk);
207 if (job->driver->drain) {
208 job->driver->drain(job);
212 static void block_job_detach_aio_context(void *opaque)
214 BlockJob *job = opaque;
216 /* In case the job terminates during aio_poll()... */
217 block_job_ref(job);
219 block_job_pause(job);
221 while (!job->paused && !job->completed) {
222 block_job_drain(job);
225 block_job_unref(job);
228 static char *child_job_get_parent_desc(BdrvChild *c)
230 BlockJob *job = c->opaque;
231 return g_strdup_printf("%s job '%s'",
232 BlockJobType_str(job->driver->job_type),
233 job->id);
236 static void child_job_drained_begin(BdrvChild *c)
238 BlockJob *job = c->opaque;
239 block_job_pause(job);
242 static void child_job_drained_end(BdrvChild *c)
244 BlockJob *job = c->opaque;
245 block_job_resume(job);
248 static const BdrvChildRole child_job = {
249 .get_parent_desc = child_job_get_parent_desc,
250 .drained_begin = child_job_drained_begin,
251 .drained_end = child_job_drained_end,
252 .stay_at_node = true,
255 void block_job_remove_all_bdrv(BlockJob *job)
257 GSList *l;
258 for (l = job->nodes; l; l = l->next) {
259 BdrvChild *c = l->data;
260 bdrv_op_unblock_all(c->bs, job->blocker);
261 bdrv_root_unref_child(c);
263 g_slist_free(job->nodes);
264 job->nodes = NULL;
267 int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
268 uint64_t perm, uint64_t shared_perm, Error **errp)
270 BdrvChild *c;
272 c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm,
273 job, errp);
274 if (c == NULL) {
275 return -EPERM;
278 job->nodes = g_slist_prepend(job->nodes, c);
279 bdrv_ref(bs);
280 bdrv_op_block_all(bs, job->blocker);
282 return 0;
285 bool block_job_is_internal(BlockJob *job)
287 return (job->id == NULL);
290 static bool block_job_started(BlockJob *job)
292 return job->co;
296 * All jobs must allow a pause point before entering their job proper. This
297 * ensures that jobs can be paused prior to being started, then resumed later.
299 static void coroutine_fn block_job_co_entry(void *opaque)
301 BlockJob *job = opaque;
303 assert(job && job->driver && job->driver->start);
304 block_job_pause_point(job);
305 job->driver->start(job);
308 static void block_job_sleep_timer_cb(void *opaque)
310 BlockJob *job = opaque;
312 block_job_enter(job);
315 void block_job_start(BlockJob *job)
317 assert(job && !block_job_started(job) && job->paused &&
318 job->driver && job->driver->start);
319 job->co = qemu_coroutine_create(block_job_co_entry, job);
320 job->pause_count--;
321 job->busy = true;
322 job->paused = false;
323 bdrv_coroutine_enter(blk_bs(job->blk), job->co);
326 static void block_job_completed_single(BlockJob *job)
328 assert(job->completed);
330 if (!job->ret) {
331 if (job->driver->commit) {
332 job->driver->commit(job);
334 } else {
335 if (job->driver->abort) {
336 job->driver->abort(job);
339 if (job->driver->clean) {
340 job->driver->clean(job);
343 if (job->cb) {
344 job->cb(job->opaque, job->ret);
347 /* Emit events only if we actually started */
348 if (block_job_started(job)) {
349 if (block_job_is_cancelled(job)) {
350 block_job_event_cancelled(job);
351 } else {
352 const char *msg = NULL;
353 if (job->ret < 0) {
354 msg = strerror(-job->ret);
356 block_job_event_completed(job, msg);
360 if (job->txn) {
361 QLIST_REMOVE(job, txn_list);
362 block_job_txn_unref(job->txn);
364 block_job_unref(job);
367 static void block_job_cancel_async(BlockJob *job)
369 if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) {
370 block_job_iostatus_reset(job);
372 if (job->user_paused) {
373 /* Do not call block_job_enter here, the caller will handle it. */
374 job->user_paused = false;
375 job->pause_count--;
377 job->cancelled = true;
380 static int block_job_finish_sync(BlockJob *job,
381 void (*finish)(BlockJob *, Error **errp),
382 Error **errp)
384 Error *local_err = NULL;
385 int ret;
387 assert(blk_bs(job->blk)->job == job);
389 block_job_ref(job);
391 if (finish) {
392 finish(job, &local_err);
394 if (local_err) {
395 error_propagate(errp, local_err);
396 block_job_unref(job);
397 return -EBUSY;
399 /* block_job_drain calls block_job_enter, and it should be enough to
400 * induce progress until the job completes or moves to the main thread.
402 while (!job->deferred_to_main_loop && !job->completed) {
403 block_job_drain(job);
405 while (!job->completed) {
406 aio_poll(qemu_get_aio_context(), true);
408 ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
409 block_job_unref(job);
410 return ret;
413 static void block_job_completed_txn_abort(BlockJob *job)
415 AioContext *ctx;
416 BlockJobTxn *txn = job->txn;
417 BlockJob *other_job;
419 if (txn->aborting) {
421 * We are cancelled by another job, which will handle everything.
423 return;
425 txn->aborting = true;
426 block_job_txn_ref(txn);
428 /* We are the first failed job. Cancel other jobs. */
429 QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
430 ctx = blk_get_aio_context(other_job->blk);
431 aio_context_acquire(ctx);
434 /* Other jobs are effectively cancelled by us, set the status for
435 * them; this job, however, may or may not be cancelled, depending
436 * on the caller, so leave it. */
437 QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
438 if (other_job != job) {
439 block_job_cancel_async(other_job);
442 while (!QLIST_EMPTY(&txn->jobs)) {
443 other_job = QLIST_FIRST(&txn->jobs);
444 ctx = blk_get_aio_context(other_job->blk);
445 if (!other_job->completed) {
446 assert(other_job->cancelled);
447 block_job_finish_sync(other_job, NULL, NULL);
449 block_job_completed_single(other_job);
450 aio_context_release(ctx);
453 block_job_txn_unref(txn);
456 static void block_job_completed_txn_success(BlockJob *job)
458 AioContext *ctx;
459 BlockJobTxn *txn = job->txn;
460 BlockJob *other_job, *next;
462 * Successful completion, see if there are other running jobs in this
463 * txn.
465 QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
466 if (!other_job->completed) {
467 return;
470 /* We are the last completed job, commit the transaction. */
471 QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
472 ctx = blk_get_aio_context(other_job->blk);
473 aio_context_acquire(ctx);
474 assert(other_job->ret == 0);
475 block_job_completed_single(other_job);
476 aio_context_release(ctx);
480 /* Assumes the block_job_mutex is held */
481 static bool block_job_timer_pending(BlockJob *job)
483 return timer_pending(&job->sleep_timer);
486 void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
488 Error *local_err = NULL;
489 int64_t old_speed = job->speed;
491 if (!job->driver->set_speed) {
492 error_setg(errp, QERR_UNSUPPORTED);
493 return;
495 job->driver->set_speed(job, speed, &local_err);
496 if (local_err) {
497 error_propagate(errp, local_err);
498 return;
501 job->speed = speed;
502 if (speed <= old_speed) {
503 return;
506 /* kick only if a timer is pending */
507 block_job_enter_cond(job, block_job_timer_pending);
510 void block_job_complete(BlockJob *job, Error **errp)
512 /* Should not be reachable via external interface for internal jobs */
513 assert(job->id);
514 if (job->pause_count || job->cancelled ||
515 !block_job_started(job) || !job->driver->complete) {
516 error_setg(errp, "The active block job '%s' cannot be completed",
517 job->id);
518 return;
521 job->driver->complete(job, errp);
524 void block_job_user_pause(BlockJob *job)
526 job->user_paused = true;
527 block_job_pause(job);
530 bool block_job_user_paused(BlockJob *job)
532 return job->user_paused;
535 void block_job_user_resume(BlockJob *job)
537 if (job && job->user_paused && job->pause_count > 0) {
538 block_job_iostatus_reset(job);
539 job->user_paused = false;
540 block_job_resume(job);
544 void block_job_cancel(BlockJob *job)
546 if (block_job_started(job)) {
547 block_job_cancel_async(job);
548 block_job_enter(job);
549 } else {
550 block_job_completed(job, -ECANCELED);
554 /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
555 * used with block_job_finish_sync() without the need for (rather nasty)
556 * function pointer casts there. */
557 static void block_job_cancel_err(BlockJob *job, Error **errp)
559 block_job_cancel(job);
562 int block_job_cancel_sync(BlockJob *job)
564 return block_job_finish_sync(job, &block_job_cancel_err, NULL);
567 void block_job_cancel_sync_all(void)
569 BlockJob *job;
570 AioContext *aio_context;
572 while ((job = QLIST_FIRST(&block_jobs))) {
573 aio_context = blk_get_aio_context(job->blk);
574 aio_context_acquire(aio_context);
575 block_job_cancel_sync(job);
576 aio_context_release(aio_context);
580 int block_job_complete_sync(BlockJob *job, Error **errp)
582 return block_job_finish_sync(job, &block_job_complete, errp);
585 BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
587 BlockJobInfo *info;
589 if (block_job_is_internal(job)) {
590 error_setg(errp, "Cannot query QEMU internal jobs");
591 return NULL;
593 info = g_new0(BlockJobInfo, 1);
594 info->type = g_strdup(BlockJobType_str(job->driver->job_type));
595 info->device = g_strdup(job->id);
596 info->len = job->len;
597 info->busy = atomic_read(&job->busy);
598 info->paused = job->pause_count > 0;
599 info->offset = job->offset;
600 info->speed = job->speed;
601 info->io_status = job->iostatus;
602 info->ready = job->ready;
603 return info;
606 static void block_job_iostatus_set_err(BlockJob *job, int error)
608 if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
609 job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
610 BLOCK_DEVICE_IO_STATUS_FAILED;
614 static void block_job_event_cancelled(BlockJob *job)
616 if (block_job_is_internal(job)) {
617 return;
620 qapi_event_send_block_job_cancelled(job->driver->job_type,
621 job->id,
622 job->len,
623 job->offset,
624 job->speed,
625 &error_abort);
628 static void block_job_event_completed(BlockJob *job, const char *msg)
630 if (block_job_is_internal(job)) {
631 return;
634 qapi_event_send_block_job_completed(job->driver->job_type,
635 job->id,
636 job->len,
637 job->offset,
638 job->speed,
639 !!msg,
640 msg,
641 &error_abort);
645 * API for block job drivers and the block layer. These functions are
646 * declared in blockjob_int.h.
649 void *block_job_create(const char *job_id, const BlockJobDriver *driver,
650 BlockDriverState *bs, uint64_t perm,
651 uint64_t shared_perm, int64_t speed, int flags,
652 BlockCompletionFunc *cb, void *opaque, Error **errp)
654 BlockBackend *blk;
655 BlockJob *job;
656 int ret;
658 if (bs->job) {
659 error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
660 return NULL;
663 if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) {
664 job_id = bdrv_get_device_name(bs);
665 if (!*job_id) {
666 error_setg(errp, "An explicit job ID is required for this node");
667 return NULL;
671 if (job_id) {
672 if (flags & BLOCK_JOB_INTERNAL) {
673 error_setg(errp, "Cannot specify job ID for internal block job");
674 return NULL;
677 if (!id_wellformed(job_id)) {
678 error_setg(errp, "Invalid job ID '%s'", job_id);
679 return NULL;
682 if (block_job_get(job_id)) {
683 error_setg(errp, "Job ID '%s' already in use", job_id);
684 return NULL;
688 blk = blk_new(perm, shared_perm);
689 ret = blk_insert_bs(blk, bs, errp);
690 if (ret < 0) {
691 blk_unref(blk);
692 return NULL;
695 job = g_malloc0(driver->instance_size);
696 job->driver = driver;
697 job->id = g_strdup(job_id);
698 job->blk = blk;
699 job->cb = cb;
700 job->opaque = opaque;
701 job->busy = false;
702 job->paused = true;
703 job->pause_count = 1;
704 job->refcnt = 1;
705 aio_timer_init(qemu_get_aio_context(), &job->sleep_timer,
706 QEMU_CLOCK_REALTIME, SCALE_NS,
707 block_job_sleep_timer_cb, job);
709 error_setg(&job->blocker, "block device is in use by block job: %s",
710 BlockJobType_str(driver->job_type));
711 block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort);
712 bs->job = job;
714 bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
716 QLIST_INSERT_HEAD(&block_jobs, job, job_list);
718 blk_add_aio_context_notifier(blk, block_job_attached_aio_context,
719 block_job_detach_aio_context, job);
721 /* Only set speed when necessary to avoid NotSupported error */
722 if (speed != 0) {
723 Error *local_err = NULL;
725 block_job_set_speed(job, speed, &local_err);
726 if (local_err) {
727 block_job_unref(job);
728 error_propagate(errp, local_err);
729 return NULL;
732 return job;
735 void block_job_pause_all(void)
737 BlockJob *job = NULL;
738 while ((job = block_job_next(job))) {
739 AioContext *aio_context = blk_get_aio_context(job->blk);
741 aio_context_acquire(aio_context);
742 block_job_ref(job);
743 block_job_pause(job);
744 aio_context_release(aio_context);
748 void block_job_early_fail(BlockJob *job)
750 block_job_unref(job);
753 void block_job_completed(BlockJob *job, int ret)
755 assert(blk_bs(job->blk)->job == job);
756 assert(!job->completed);
757 job->completed = true;
758 job->ret = ret;
759 if (!job->txn) {
760 block_job_completed_single(job);
761 } else if (ret < 0 || block_job_is_cancelled(job)) {
762 block_job_completed_txn_abort(job);
763 } else {
764 block_job_completed_txn_success(job);
768 static bool block_job_should_pause(BlockJob *job)
770 return job->pause_count > 0;
773 /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds.
774 * Reentering the job coroutine with block_job_enter() before the timer has
775 * expired is allowed and cancels the timer.
777 * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be
778 * called explicitly. */
779 static void block_job_do_yield(BlockJob *job, uint64_t ns)
781 block_job_lock();
782 if (ns != -1) {
783 timer_mod(&job->sleep_timer, ns);
785 job->busy = false;
786 block_job_unlock();
787 qemu_coroutine_yield();
789 /* Set by block_job_enter before re-entering the coroutine. */
790 assert(job->busy);
793 void coroutine_fn block_job_pause_point(BlockJob *job)
795 assert(job && block_job_started(job));
797 if (!block_job_should_pause(job)) {
798 return;
800 if (block_job_is_cancelled(job)) {
801 return;
804 if (job->driver->pause) {
805 job->driver->pause(job);
808 if (block_job_should_pause(job) && !block_job_is_cancelled(job)) {
809 job->paused = true;
810 block_job_do_yield(job, -1);
811 job->paused = false;
814 if (job->driver->resume) {
815 job->driver->resume(job);
819 void block_job_resume_all(void)
821 BlockJob *job, *next;
823 QLIST_FOREACH_SAFE(job, &block_jobs, job_list, next) {
824 AioContext *aio_context = blk_get_aio_context(job->blk);
826 aio_context_acquire(aio_context);
827 block_job_resume(job);
828 block_job_unref(job);
829 aio_context_release(aio_context);
834 * Conditionally enter a block_job pending a call to fn() while
835 * under the block_job_lock critical section.
837 static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job))
839 if (!block_job_started(job)) {
840 return;
842 if (job->deferred_to_main_loop) {
843 return;
846 block_job_lock();
847 if (job->busy) {
848 block_job_unlock();
849 return;
852 if (fn && !fn(job)) {
853 block_job_unlock();
854 return;
857 assert(!job->deferred_to_main_loop);
858 timer_del(&job->sleep_timer);
859 job->busy = true;
860 block_job_unlock();
861 aio_co_wake(job->co);
864 void block_job_enter(BlockJob *job)
866 block_job_enter_cond(job, NULL);
869 bool block_job_is_cancelled(BlockJob *job)
871 return job->cancelled;
874 void block_job_sleep_ns(BlockJob *job, int64_t ns)
876 assert(job->busy);
878 /* Check cancellation *before* setting busy = false, too! */
879 if (block_job_is_cancelled(job)) {
880 return;
883 if (!block_job_should_pause(job)) {
884 block_job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns);
887 block_job_pause_point(job);
890 void block_job_yield(BlockJob *job)
892 assert(job->busy);
894 /* Check cancellation *before* setting busy = false, too! */
895 if (block_job_is_cancelled(job)) {
896 return;
899 if (!block_job_should_pause(job)) {
900 block_job_do_yield(job, -1);
903 block_job_pause_point(job);
906 void block_job_iostatus_reset(BlockJob *job)
908 if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
909 return;
911 assert(job->user_paused && job->pause_count > 0);
912 job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
915 void block_job_event_ready(BlockJob *job)
917 job->ready = true;
919 if (block_job_is_internal(job)) {
920 return;
923 qapi_event_send_block_job_ready(job->driver->job_type,
924 job->id,
925 job->len,
926 job->offset,
927 job->speed, &error_abort);
930 BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
931 int is_read, int error)
933 BlockErrorAction action;
935 switch (on_err) {
936 case BLOCKDEV_ON_ERROR_ENOSPC:
937 case BLOCKDEV_ON_ERROR_AUTO:
938 action = (error == ENOSPC) ?
939 BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
940 break;
941 case BLOCKDEV_ON_ERROR_STOP:
942 action = BLOCK_ERROR_ACTION_STOP;
943 break;
944 case BLOCKDEV_ON_ERROR_REPORT:
945 action = BLOCK_ERROR_ACTION_REPORT;
946 break;
947 case BLOCKDEV_ON_ERROR_IGNORE:
948 action = BLOCK_ERROR_ACTION_IGNORE;
949 break;
950 default:
951 abort();
953 if (!block_job_is_internal(job)) {
954 qapi_event_send_block_job_error(job->id,
955 is_read ? IO_OPERATION_TYPE_READ :
956 IO_OPERATION_TYPE_WRITE,
957 action, &error_abort);
959 if (action == BLOCK_ERROR_ACTION_STOP) {
960 /* make the pause user visible, which will be resumed from QMP. */
961 block_job_user_pause(job);
962 block_job_iostatus_set_err(job, error);
964 return action;
967 typedef struct {
968 BlockJob *job;
969 AioContext *aio_context;
970 BlockJobDeferToMainLoopFn *fn;
971 void *opaque;
972 } BlockJobDeferToMainLoopData;
974 static void block_job_defer_to_main_loop_bh(void *opaque)
976 BlockJobDeferToMainLoopData *data = opaque;
977 AioContext *aio_context;
979 /* Prevent race with block_job_defer_to_main_loop() */
980 aio_context_acquire(data->aio_context);
982 /* Fetch BDS AioContext again, in case it has changed */
983 aio_context = blk_get_aio_context(data->job->blk);
984 if (aio_context != data->aio_context) {
985 aio_context_acquire(aio_context);
988 data->fn(data->job, data->opaque);
990 if (aio_context != data->aio_context) {
991 aio_context_release(aio_context);
994 aio_context_release(data->aio_context);
996 g_free(data);
999 void block_job_defer_to_main_loop(BlockJob *job,
1000 BlockJobDeferToMainLoopFn *fn,
1001 void *opaque)
1003 BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data));
1004 data->job = job;
1005 data->aio_context = blk_get_aio_context(job->blk);
1006 data->fn = fn;
1007 data->opaque = opaque;
1008 job->deferred_to_main_loop = true;
1010 aio_bh_schedule_oneshot(qemu_get_aio_context(),
1011 block_job_defer_to_main_loop_bh, data);