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2f0c9fe6 PB |
1 | /* |
2 | * QEMU System Emulator block driver | |
3 | * | |
4 | * Copyright (c) 2011 IBM Corp. | |
5 | * Copyright (c) 2012 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 | ||
d38ea87a | 26 | #include "qemu/osdep.h" |
2f0c9fe6 | 27 | #include "qemu-common.h" |
737e150e | 28 | #include "block/block.h" |
c87621ea | 29 | #include "block/blockjob_int.h" |
737e150e | 30 | #include "block/block_int.h" |
c9de4050 | 31 | #include "block/trace.h" |
373340b2 | 32 | #include "sysemu/block-backend.h" |
e688df6b | 33 | #include "qapi/error.h" |
9af23989 | 34 | #include "qapi/qapi-events-block-core.h" |
cc7a8ea7 | 35 | #include "qapi/qmp/qerror.h" |
10817bf0 | 36 | #include "qemu/coroutine.h" |
7f0317cf | 37 | #include "qemu/id.h" |
1de7afc9 | 38 | #include "qemu/timer.h" |
2f0c9fe6 | 39 | |
fc24908e PB |
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 | |
42 | * block_job_enter. */ | |
43 | static QemuMutex block_job_mutex; | |
44 | ||
c9de4050 JS |
45 | /* BlockJob State Transition Table */ |
46 | bool BlockJobSTT[BLOCK_JOB_STATUS__MAX][BLOCK_JOB_STATUS__MAX] = { | |
e0cf0364 JS |
47 | /* U, C, R, P, Y, S, X, E */ |
48 | /* U: */ [BLOCK_JOB_STATUS_UNDEFINED] = {0, 1, 0, 0, 0, 0, 0, 0}, | |
49 | /* C: */ [BLOCK_JOB_STATUS_CREATED] = {0, 0, 1, 0, 0, 0, 1, 0}, | |
50 | /* R: */ [BLOCK_JOB_STATUS_RUNNING] = {0, 0, 0, 1, 1, 0, 1, 1}, | |
51 | /* P: */ [BLOCK_JOB_STATUS_PAUSED] = {0, 0, 1, 0, 0, 0, 0, 0}, | |
52 | /* Y: */ [BLOCK_JOB_STATUS_READY] = {0, 0, 0, 0, 0, 1, 1, 1}, | |
53 | /* S: */ [BLOCK_JOB_STATUS_STANDBY] = {0, 0, 0, 0, 1, 0, 0, 0}, | |
54 | /* X: */ [BLOCK_JOB_STATUS_ABORTING] = {0, 0, 0, 0, 0, 0, 0, 1}, | |
55 | /* E: */ [BLOCK_JOB_STATUS_CONCLUDED] = {0, 0, 0, 0, 0, 0, 0, 0}, | |
c9de4050 JS |
56 | }; |
57 | ||
0ec4dfb8 | 58 | bool BlockJobVerbTable[BLOCK_JOB_VERB__MAX][BLOCK_JOB_STATUS__MAX] = { |
e0cf0364 JS |
59 | /* U, C, R, P, Y, S, X, E */ |
60 | [BLOCK_JOB_VERB_CANCEL] = {0, 1, 1, 1, 1, 1, 0, 0}, | |
61 | [BLOCK_JOB_VERB_PAUSE] = {0, 1, 1, 1, 1, 1, 0, 0}, | |
62 | [BLOCK_JOB_VERB_RESUME] = {0, 1, 1, 1, 1, 1, 0, 0}, | |
63 | [BLOCK_JOB_VERB_SET_SPEED] = {0, 1, 1, 1, 1, 1, 0, 0}, | |
64 | [BLOCK_JOB_VERB_COMPLETE] = {0, 0, 0, 0, 1, 0, 0, 0}, | |
0ec4dfb8 JS |
65 | }; |
66 | ||
c9de4050 JS |
67 | static void block_job_state_transition(BlockJob *job, BlockJobStatus s1) |
68 | { | |
69 | BlockJobStatus s0 = job->status; | |
70 | assert(s1 >= 0 && s1 <= BLOCK_JOB_STATUS__MAX); | |
71 | trace_block_job_state_transition(job, job->ret, BlockJobSTT[s0][s1] ? | |
72 | "allowed" : "disallowed", | |
73 | qapi_enum_lookup(&BlockJobStatus_lookup, | |
74 | s0), | |
75 | qapi_enum_lookup(&BlockJobStatus_lookup, | |
76 | s1)); | |
77 | assert(BlockJobSTT[s0][s1]); | |
78 | job->status = s1; | |
79 | } | |
80 | ||
0ec4dfb8 JS |
81 | static int block_job_apply_verb(BlockJob *job, BlockJobVerb bv, Error **errp) |
82 | { | |
83 | assert(bv >= 0 && bv <= BLOCK_JOB_VERB__MAX); | |
84 | trace_block_job_apply_verb(job, qapi_enum_lookup(&BlockJobStatus_lookup, | |
85 | job->status), | |
86 | qapi_enum_lookup(&BlockJobVerb_lookup, bv), | |
87 | BlockJobVerbTable[bv][job->status] ? | |
88 | "allowed" : "prohibited"); | |
89 | if (BlockJobVerbTable[bv][job->status]) { | |
90 | return 0; | |
91 | } | |
92 | error_setg(errp, "Job '%s' in state '%s' cannot accept command verb '%s'", | |
93 | job->id, qapi_enum_lookup(&BlockJobStatus_lookup, job->status), | |
94 | qapi_enum_lookup(&BlockJobVerb_lookup, bv)); | |
95 | return -EPERM; | |
96 | } | |
97 | ||
fc24908e PB |
98 | static void block_job_lock(void) |
99 | { | |
100 | qemu_mutex_lock(&block_job_mutex); | |
101 | } | |
102 | ||
103 | static void block_job_unlock(void) | |
104 | { | |
105 | qemu_mutex_unlock(&block_job_mutex); | |
106 | } | |
107 | ||
108 | static void __attribute__((__constructor__)) block_job_init(void) | |
109 | { | |
110 | qemu_mutex_init(&block_job_mutex); | |
111 | } | |
112 | ||
8254b6d9 JS |
113 | static void block_job_event_cancelled(BlockJob *job); |
114 | static void block_job_event_completed(BlockJob *job, const char *msg); | |
aa9ef2e6 | 115 | static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job)); |
8254b6d9 | 116 | |
c55a832f FZ |
117 | /* Transactional group of block jobs */ |
118 | struct BlockJobTxn { | |
119 | ||
120 | /* Is this txn being cancelled? */ | |
121 | bool aborting; | |
122 | ||
123 | /* List of jobs */ | |
124 | QLIST_HEAD(, BlockJob) jobs; | |
125 | ||
126 | /* Reference count */ | |
127 | int refcnt; | |
128 | }; | |
129 | ||
a7112795 AG |
130 | static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs); |
131 | ||
88691b37 PB |
132 | /* |
133 | * The block job API is composed of two categories of functions. | |
134 | * | |
135 | * The first includes functions used by the monitor. The monitor is | |
136 | * peculiar in that it accesses the block job list with block_job_get, and | |
137 | * therefore needs consistency across block_job_get and the actual operation | |
138 | * (e.g. block_job_set_speed). The consistency is achieved with | |
139 | * aio_context_acquire/release. These functions are declared in blockjob.h. | |
140 | * | |
141 | * The second includes functions used by the block job drivers and sometimes | |
142 | * by the core block layer. These do not care about locking, because the | |
143 | * whole coroutine runs under the AioContext lock, and are declared in | |
144 | * blockjob_int.h. | |
145 | */ | |
146 | ||
a7112795 AG |
147 | BlockJob *block_job_next(BlockJob *job) |
148 | { | |
149 | if (!job) { | |
150 | return QLIST_FIRST(&block_jobs); | |
151 | } | |
152 | return QLIST_NEXT(job, job_list); | |
153 | } | |
154 | ||
ffb1f10c AG |
155 | BlockJob *block_job_get(const char *id) |
156 | { | |
157 | BlockJob *job; | |
158 | ||
159 | QLIST_FOREACH(job, &block_jobs, job_list) { | |
559b935f | 160 | if (job->id && !strcmp(id, job->id)) { |
ffb1f10c AG |
161 | return job; |
162 | } | |
163 | } | |
164 | ||
165 | return NULL; | |
166 | } | |
167 | ||
c8ab5c2d PB |
168 | BlockJobTxn *block_job_txn_new(void) |
169 | { | |
170 | BlockJobTxn *txn = g_new0(BlockJobTxn, 1); | |
171 | QLIST_INIT(&txn->jobs); | |
172 | txn->refcnt = 1; | |
173 | return txn; | |
174 | } | |
175 | ||
176 | static void block_job_txn_ref(BlockJobTxn *txn) | |
177 | { | |
178 | txn->refcnt++; | |
179 | } | |
180 | ||
181 | void block_job_txn_unref(BlockJobTxn *txn) | |
182 | { | |
183 | if (txn && --txn->refcnt == 0) { | |
184 | g_free(txn); | |
185 | } | |
186 | } | |
187 | ||
188 | void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job) | |
189 | { | |
190 | if (!txn) { | |
191 | return; | |
192 | } | |
193 | ||
194 | assert(!job->txn); | |
195 | job->txn = txn; | |
196 | ||
197 | QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); | |
198 | block_job_txn_ref(txn); | |
199 | } | |
200 | ||
f321dcb5 PB |
201 | static void block_job_pause(BlockJob *job) |
202 | { | |
203 | job->pause_count++; | |
204 | } | |
205 | ||
206 | static void block_job_resume(BlockJob *job) | |
207 | { | |
208 | assert(job->pause_count > 0); | |
209 | job->pause_count--; | |
210 | if (job->pause_count) { | |
211 | return; | |
212 | } | |
213 | block_job_enter(job); | |
214 | } | |
215 | ||
4172a003 | 216 | void block_job_ref(BlockJob *job) |
05b0d8e3 PB |
217 | { |
218 | ++job->refcnt; | |
219 | } | |
220 | ||
221 | static void block_job_attached_aio_context(AioContext *new_context, | |
222 | void *opaque); | |
223 | static void block_job_detach_aio_context(void *opaque); | |
224 | ||
4172a003 | 225 | void block_job_unref(BlockJob *job) |
05b0d8e3 PB |
226 | { |
227 | if (--job->refcnt == 0) { | |
228 | BlockDriverState *bs = blk_bs(job->blk); | |
0a3e155f | 229 | QLIST_REMOVE(job, job_list); |
05b0d8e3 PB |
230 | bs->job = NULL; |
231 | block_job_remove_all_bdrv(job); | |
232 | blk_remove_aio_context_notifier(job->blk, | |
233 | block_job_attached_aio_context, | |
234 | block_job_detach_aio_context, job); | |
235 | blk_unref(job->blk); | |
236 | error_free(job->blocker); | |
237 | g_free(job->id); | |
fc24908e | 238 | assert(!timer_pending(&job->sleep_timer)); |
05b0d8e3 PB |
239 | g_free(job); |
240 | } | |
241 | } | |
242 | ||
463e0be1 SH |
243 | static void block_job_attached_aio_context(AioContext *new_context, |
244 | void *opaque) | |
245 | { | |
246 | BlockJob *job = opaque; | |
247 | ||
248 | if (job->driver->attached_aio_context) { | |
249 | job->driver->attached_aio_context(job, new_context); | |
250 | } | |
251 | ||
252 | block_job_resume(job); | |
253 | } | |
254 | ||
bae8196d PB |
255 | static void block_job_drain(BlockJob *job) |
256 | { | |
257 | /* If job is !job->busy this kicks it into the next pause point. */ | |
258 | block_job_enter(job); | |
259 | ||
260 | blk_drain(job->blk); | |
261 | if (job->driver->drain) { | |
262 | job->driver->drain(job); | |
263 | } | |
264 | } | |
265 | ||
463e0be1 SH |
266 | static void block_job_detach_aio_context(void *opaque) |
267 | { | |
268 | BlockJob *job = opaque; | |
269 | ||
270 | /* In case the job terminates during aio_poll()... */ | |
271 | block_job_ref(job); | |
272 | ||
273 | block_job_pause(job); | |
274 | ||
463e0be1 | 275 | while (!job->paused && !job->completed) { |
bae8196d | 276 | block_job_drain(job); |
463e0be1 SH |
277 | } |
278 | ||
279 | block_job_unref(job); | |
280 | } | |
281 | ||
f321dcb5 PB |
282 | static char *child_job_get_parent_desc(BdrvChild *c) |
283 | { | |
284 | BlockJob *job = c->opaque; | |
285 | return g_strdup_printf("%s job '%s'", | |
977c736f | 286 | BlockJobType_str(job->driver->job_type), |
f321dcb5 PB |
287 | job->id); |
288 | } | |
289 | ||
ad90feba | 290 | static void child_job_drained_begin(BdrvChild *c) |
f321dcb5 | 291 | { |
ad90feba | 292 | BlockJob *job = c->opaque; |
f321dcb5 PB |
293 | block_job_pause(job); |
294 | } | |
295 | ||
ad90feba | 296 | static void child_job_drained_end(BdrvChild *c) |
f321dcb5 | 297 | { |
ad90feba | 298 | BlockJob *job = c->opaque; |
f321dcb5 PB |
299 | block_job_resume(job); |
300 | } | |
301 | ||
ad90feba KW |
302 | static const BdrvChildRole child_job = { |
303 | .get_parent_desc = child_job_get_parent_desc, | |
304 | .drained_begin = child_job_drained_begin, | |
305 | .drained_end = child_job_drained_end, | |
306 | .stay_at_node = true, | |
f321dcb5 PB |
307 | }; |
308 | ||
bbc02b90 KW |
309 | void block_job_remove_all_bdrv(BlockJob *job) |
310 | { | |
311 | GSList *l; | |
312 | for (l = job->nodes; l; l = l->next) { | |
313 | BdrvChild *c = l->data; | |
314 | bdrv_op_unblock_all(c->bs, job->blocker); | |
315 | bdrv_root_unref_child(c); | |
316 | } | |
317 | g_slist_free(job->nodes); | |
318 | job->nodes = NULL; | |
319 | } | |
320 | ||
76d554e2 KW |
321 | int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs, |
322 | uint64_t perm, uint64_t shared_perm, Error **errp) | |
23d402d4 | 323 | { |
76d554e2 KW |
324 | BdrvChild *c; |
325 | ||
326 | c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm, | |
327 | job, errp); | |
328 | if (c == NULL) { | |
329 | return -EPERM; | |
330 | } | |
331 | ||
332 | job->nodes = g_slist_prepend(job->nodes, c); | |
23d402d4 AG |
333 | bdrv_ref(bs); |
334 | bdrv_op_block_all(bs, job->blocker); | |
76d554e2 KW |
335 | |
336 | return 0; | |
23d402d4 AG |
337 | } |
338 | ||
559b935f JS |
339 | bool block_job_is_internal(BlockJob *job) |
340 | { | |
341 | return (job->id == NULL); | |
342 | } | |
343 | ||
5ccac6f1 JS |
344 | static bool block_job_started(BlockJob *job) |
345 | { | |
346 | return job->co; | |
347 | } | |
348 | ||
e3796a24 JS |
349 | /** |
350 | * All jobs must allow a pause point before entering their job proper. This | |
351 | * ensures that jobs can be paused prior to being started, then resumed later. | |
352 | */ | |
353 | static void coroutine_fn block_job_co_entry(void *opaque) | |
354 | { | |
355 | BlockJob *job = opaque; | |
356 | ||
357 | assert(job && job->driver && job->driver->start); | |
358 | block_job_pause_point(job); | |
359 | job->driver->start(job); | |
360 | } | |
361 | ||
fc24908e PB |
362 | static void block_job_sleep_timer_cb(void *opaque) |
363 | { | |
364 | BlockJob *job = opaque; | |
365 | ||
366 | block_job_enter(job); | |
367 | } | |
368 | ||
5ccac6f1 JS |
369 | void block_job_start(BlockJob *job) |
370 | { | |
371 | assert(job && !block_job_started(job) && job->paused && | |
e3796a24 JS |
372 | job->driver && job->driver->start); |
373 | job->co = qemu_coroutine_create(block_job_co_entry, job); | |
374 | job->pause_count--; | |
375 | job->busy = true; | |
376 | job->paused = false; | |
c9de4050 | 377 | block_job_state_transition(job, BLOCK_JOB_STATUS_RUNNING); |
aef4278c | 378 | bdrv_coroutine_enter(blk_bs(job->blk), job->co); |
5ccac6f1 JS |
379 | } |
380 | ||
e0cf0364 JS |
381 | static void block_job_conclude(BlockJob *job) |
382 | { | |
383 | block_job_state_transition(job, BLOCK_JOB_STATUS_CONCLUDED); | |
384 | } | |
385 | ||
c55a832f FZ |
386 | static void block_job_completed_single(BlockJob *job) |
387 | { | |
4fb588e9 PB |
388 | assert(job->completed); |
389 | ||
10a3fbb0 JS |
390 | if (job->ret || block_job_is_cancelled(job)) { |
391 | block_job_state_transition(job, BLOCK_JOB_STATUS_ABORTING); | |
392 | } | |
393 | ||
c55a832f FZ |
394 | if (!job->ret) { |
395 | if (job->driver->commit) { | |
396 | job->driver->commit(job); | |
397 | } | |
398 | } else { | |
399 | if (job->driver->abort) { | |
400 | job->driver->abort(job); | |
401 | } | |
402 | } | |
e8a40bf7 JS |
403 | if (job->driver->clean) { |
404 | job->driver->clean(job); | |
405 | } | |
8254b6d9 JS |
406 | |
407 | if (job->cb) { | |
408 | job->cb(job->opaque, job->ret); | |
409 | } | |
5ccac6f1 JS |
410 | |
411 | /* Emit events only if we actually started */ | |
412 | if (block_job_started(job)) { | |
413 | if (block_job_is_cancelled(job)) { | |
414 | block_job_event_cancelled(job); | |
415 | } else { | |
416 | const char *msg = NULL; | |
417 | if (job->ret < 0) { | |
418 | msg = strerror(-job->ret); | |
419 | } | |
420 | block_job_event_completed(job, msg); | |
8254b6d9 | 421 | } |
8254b6d9 JS |
422 | } |
423 | ||
75859b94 JS |
424 | QLIST_REMOVE(job, txn_list); |
425 | block_job_txn_unref(job->txn); | |
e0cf0364 | 426 | block_job_conclude(job); |
c55a832f FZ |
427 | block_job_unref(job); |
428 | } | |
429 | ||
4c241cf5 PB |
430 | static void block_job_cancel_async(BlockJob *job) |
431 | { | |
432 | if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) { | |
433 | block_job_iostatus_reset(job); | |
434 | } | |
435 | if (job->user_paused) { | |
436 | /* Do not call block_job_enter here, the caller will handle it. */ | |
437 | job->user_paused = false; | |
438 | job->pause_count--; | |
439 | } | |
440 | job->cancelled = true; | |
441 | } | |
442 | ||
c8ab5c2d PB |
443 | static int block_job_finish_sync(BlockJob *job, |
444 | void (*finish)(BlockJob *, Error **errp), | |
445 | Error **errp) | |
446 | { | |
447 | Error *local_err = NULL; | |
448 | int ret; | |
449 | ||
450 | assert(blk_bs(job->blk)->job == job); | |
451 | ||
452 | block_job_ref(job); | |
453 | ||
4fb588e9 PB |
454 | if (finish) { |
455 | finish(job, &local_err); | |
456 | } | |
c8ab5c2d PB |
457 | if (local_err) { |
458 | error_propagate(errp, local_err); | |
459 | block_job_unref(job); | |
460 | return -EBUSY; | |
461 | } | |
462 | /* block_job_drain calls block_job_enter, and it should be enough to | |
463 | * induce progress until the job completes or moves to the main thread. | |
464 | */ | |
465 | while (!job->deferred_to_main_loop && !job->completed) { | |
466 | block_job_drain(job); | |
467 | } | |
468 | while (!job->completed) { | |
469 | aio_poll(qemu_get_aio_context(), true); | |
470 | } | |
471 | ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret; | |
472 | block_job_unref(job); | |
473 | return ret; | |
474 | } | |
475 | ||
c55a832f FZ |
476 | static void block_job_completed_txn_abort(BlockJob *job) |
477 | { | |
478 | AioContext *ctx; | |
479 | BlockJobTxn *txn = job->txn; | |
4fb588e9 | 480 | BlockJob *other_job; |
c55a832f FZ |
481 | |
482 | if (txn->aborting) { | |
483 | /* | |
484 | * We are cancelled by another job, which will handle everything. | |
485 | */ | |
486 | return; | |
487 | } | |
488 | txn->aborting = true; | |
4fb588e9 PB |
489 | block_job_txn_ref(txn); |
490 | ||
c55a832f FZ |
491 | /* We are the first failed job. Cancel other jobs. */ |
492 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
b6d2e599 | 493 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
494 | aio_context_acquire(ctx); |
495 | } | |
4fb588e9 PB |
496 | |
497 | /* Other jobs are effectively cancelled by us, set the status for | |
498 | * them; this job, however, may or may not be cancelled, depending | |
499 | * on the caller, so leave it. */ | |
c55a832f | 500 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { |
4fb588e9 PB |
501 | if (other_job != job) { |
502 | block_job_cancel_async(other_job); | |
c55a832f | 503 | } |
c55a832f | 504 | } |
4fb588e9 PB |
505 | while (!QLIST_EMPTY(&txn->jobs)) { |
506 | other_job = QLIST_FIRST(&txn->jobs); | |
b6d2e599 | 507 | ctx = blk_get_aio_context(other_job->blk); |
4fb588e9 PB |
508 | if (!other_job->completed) { |
509 | assert(other_job->cancelled); | |
510 | block_job_finish_sync(other_job, NULL, NULL); | |
511 | } | |
c55a832f FZ |
512 | block_job_completed_single(other_job); |
513 | aio_context_release(ctx); | |
514 | } | |
4fb588e9 PB |
515 | |
516 | block_job_txn_unref(txn); | |
c55a832f FZ |
517 | } |
518 | ||
519 | static void block_job_completed_txn_success(BlockJob *job) | |
520 | { | |
521 | AioContext *ctx; | |
522 | BlockJobTxn *txn = job->txn; | |
523 | BlockJob *other_job, *next; | |
524 | /* | |
525 | * Successful completion, see if there are other running jobs in this | |
526 | * txn. | |
527 | */ | |
528 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
529 | if (!other_job->completed) { | |
530 | return; | |
531 | } | |
532 | } | |
533 | /* We are the last completed job, commit the transaction. */ | |
534 | QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { | |
b6d2e599 | 535 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
536 | aio_context_acquire(ctx); |
537 | assert(other_job->ret == 0); | |
538 | block_job_completed_single(other_job); | |
539 | aio_context_release(ctx); | |
540 | } | |
541 | } | |
542 | ||
aa9ef2e6 JS |
543 | /* Assumes the block_job_mutex is held */ |
544 | static bool block_job_timer_pending(BlockJob *job) | |
545 | { | |
546 | return timer_pending(&job->sleep_timer); | |
547 | } | |
548 | ||
2f0c9fe6 PB |
549 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
550 | { | |
551 | Error *local_err = NULL; | |
aa9ef2e6 | 552 | int64_t old_speed = job->speed; |
2f0c9fe6 | 553 | |
3fc4b10a | 554 | if (!job->driver->set_speed) { |
c6bd8c70 | 555 | error_setg(errp, QERR_UNSUPPORTED); |
2f0c9fe6 PB |
556 | return; |
557 | } | |
0ec4dfb8 JS |
558 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_SET_SPEED, errp)) { |
559 | return; | |
560 | } | |
3fc4b10a | 561 | job->driver->set_speed(job, speed, &local_err); |
84d18f06 | 562 | if (local_err) { |
2f0c9fe6 PB |
563 | error_propagate(errp, local_err); |
564 | return; | |
565 | } | |
566 | ||
567 | job->speed = speed; | |
d4fce188 | 568 | if (speed && speed <= old_speed) { |
aa9ef2e6 JS |
569 | return; |
570 | } | |
571 | ||
572 | /* kick only if a timer is pending */ | |
573 | block_job_enter_cond(job, block_job_timer_pending); | |
2f0c9fe6 PB |
574 | } |
575 | ||
aeae883b PB |
576 | void block_job_complete(BlockJob *job, Error **errp) |
577 | { | |
559b935f JS |
578 | /* Should not be reachable via external interface for internal jobs */ |
579 | assert(job->id); | |
0ec4dfb8 JS |
580 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_COMPLETE, errp)) { |
581 | return; | |
582 | } | |
583 | if (job->pause_count || job->cancelled || !job->driver->complete) { | |
9df229c3 AG |
584 | error_setg(errp, "The active block job '%s' cannot be completed", |
585 | job->id); | |
aeae883b PB |
586 | return; |
587 | } | |
588 | ||
3fc4b10a | 589 | job->driver->complete(job, errp); |
aeae883b PB |
590 | } |
591 | ||
0ec4dfb8 | 592 | void block_job_user_pause(BlockJob *job, Error **errp) |
0df4ba58 | 593 | { |
0ec4dfb8 JS |
594 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_PAUSE, errp)) { |
595 | return; | |
596 | } | |
597 | if (job->user_paused) { | |
598 | error_setg(errp, "Job is already paused"); | |
599 | return; | |
600 | } | |
0df4ba58 JS |
601 | job->user_paused = true; |
602 | block_job_pause(job); | |
603 | } | |
604 | ||
0df4ba58 JS |
605 | bool block_job_user_paused(BlockJob *job) |
606 | { | |
6573d9c6 | 607 | return job->user_paused; |
0df4ba58 JS |
608 | } |
609 | ||
0ec4dfb8 | 610 | void block_job_user_resume(BlockJob *job, Error **errp) |
0df4ba58 | 611 | { |
0ec4dfb8 JS |
612 | assert(job); |
613 | if (!job->user_paused || job->pause_count <= 0) { | |
614 | error_setg(errp, "Can't resume a job that was not paused"); | |
615 | return; | |
0df4ba58 | 616 | } |
0ec4dfb8 JS |
617 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_RESUME, errp)) { |
618 | return; | |
619 | } | |
620 | block_job_iostatus_reset(job); | |
621 | job->user_paused = false; | |
622 | block_job_resume(job); | |
0df4ba58 JS |
623 | } |
624 | ||
8acc72a4 PB |
625 | void block_job_cancel(BlockJob *job) |
626 | { | |
e0cf0364 JS |
627 | if (job->status == BLOCK_JOB_STATUS_CONCLUDED) { |
628 | return; | |
629 | } else if (block_job_started(job)) { | |
4c241cf5 | 630 | block_job_cancel_async(job); |
5ccac6f1 JS |
631 | block_job_enter(job); |
632 | } else { | |
633 | block_job_completed(job, -ECANCELED); | |
634 | } | |
8acc72a4 PB |
635 | } |
636 | ||
0ec4dfb8 JS |
637 | void block_job_user_cancel(BlockJob *job, Error **errp) |
638 | { | |
639 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_CANCEL, errp)) { | |
640 | return; | |
641 | } | |
642 | block_job_cancel(job); | |
643 | } | |
644 | ||
345f9e1b HR |
645 | /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be |
646 | * used with block_job_finish_sync() without the need for (rather nasty) | |
647 | * function pointer casts there. */ | |
648 | static void block_job_cancel_err(BlockJob *job, Error **errp) | |
649 | { | |
650 | block_job_cancel(job); | |
651 | } | |
652 | ||
653 | int block_job_cancel_sync(BlockJob *job) | |
654 | { | |
655 | return block_job_finish_sync(job, &block_job_cancel_err, NULL); | |
656 | } | |
657 | ||
a1a2af07 KW |
658 | void block_job_cancel_sync_all(void) |
659 | { | |
660 | BlockJob *job; | |
661 | AioContext *aio_context; | |
662 | ||
663 | while ((job = QLIST_FIRST(&block_jobs))) { | |
b6d2e599 | 664 | aio_context = blk_get_aio_context(job->blk); |
a1a2af07 KW |
665 | aio_context_acquire(aio_context); |
666 | block_job_cancel_sync(job); | |
667 | aio_context_release(aio_context); | |
668 | } | |
669 | } | |
670 | ||
345f9e1b HR |
671 | int block_job_complete_sync(BlockJob *job, Error **errp) |
672 | { | |
673 | return block_job_finish_sync(job, &block_job_complete, errp); | |
674 | } | |
675 | ||
559b935f | 676 | BlockJobInfo *block_job_query(BlockJob *job, Error **errp) |
30e628b7 | 677 | { |
559b935f JS |
678 | BlockJobInfo *info; |
679 | ||
680 | if (block_job_is_internal(job)) { | |
681 | error_setg(errp, "Cannot query QEMU internal jobs"); | |
682 | return NULL; | |
683 | } | |
684 | info = g_new0(BlockJobInfo, 1); | |
977c736f | 685 | info->type = g_strdup(BlockJobType_str(job->driver->job_type)); |
8ccb9569 | 686 | info->device = g_strdup(job->id); |
32c81a4a | 687 | info->len = job->len; |
fc24908e | 688 | info->busy = atomic_read(&job->busy); |
751ebd76 | 689 | info->paused = job->pause_count > 0; |
32c81a4a PB |
690 | info->offset = job->offset; |
691 | info->speed = job->speed; | |
692 | info->io_status = job->iostatus; | |
ef6dbf1e | 693 | info->ready = job->ready; |
58b295ba | 694 | info->status = job->status; |
30e628b7 PB |
695 | return info; |
696 | } | |
32c81a4a PB |
697 | |
698 | static void block_job_iostatus_set_err(BlockJob *job, int error) | |
699 | { | |
700 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
701 | job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
702 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
703 | } | |
704 | } | |
705 | ||
8254b6d9 | 706 | static void block_job_event_cancelled(BlockJob *job) |
bcada37b | 707 | { |
559b935f JS |
708 | if (block_job_is_internal(job)) { |
709 | return; | |
710 | } | |
711 | ||
bcada37b | 712 | qapi_event_send_block_job_cancelled(job->driver->job_type, |
8ccb9569 | 713 | job->id, |
bcada37b WX |
714 | job->len, |
715 | job->offset, | |
716 | job->speed, | |
717 | &error_abort); | |
718 | } | |
32c81a4a | 719 | |
8254b6d9 | 720 | static void block_job_event_completed(BlockJob *job, const char *msg) |
a66a2a36 | 721 | { |
559b935f JS |
722 | if (block_job_is_internal(job)) { |
723 | return; | |
724 | } | |
725 | ||
bcada37b | 726 | qapi_event_send_block_job_completed(job->driver->job_type, |
8ccb9569 | 727 | job->id, |
bcada37b WX |
728 | job->len, |
729 | job->offset, | |
730 | job->speed, | |
731 | !!msg, | |
732 | msg, | |
733 | &error_abort); | |
a66a2a36 PB |
734 | } |
735 | ||
88691b37 PB |
736 | /* |
737 | * API for block job drivers and the block layer. These functions are | |
738 | * declared in blockjob_int.h. | |
739 | */ | |
740 | ||
741 | void *block_job_create(const char *job_id, const BlockJobDriver *driver, | |
75859b94 | 742 | BlockJobTxn *txn, BlockDriverState *bs, uint64_t perm, |
88691b37 PB |
743 | uint64_t shared_perm, int64_t speed, int flags, |
744 | BlockCompletionFunc *cb, void *opaque, Error **errp) | |
745 | { | |
746 | BlockBackend *blk; | |
747 | BlockJob *job; | |
748 | int ret; | |
749 | ||
750 | if (bs->job) { | |
751 | error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); | |
752 | return NULL; | |
753 | } | |
754 | ||
755 | if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) { | |
756 | job_id = bdrv_get_device_name(bs); | |
757 | if (!*job_id) { | |
758 | error_setg(errp, "An explicit job ID is required for this node"); | |
759 | return NULL; | |
760 | } | |
761 | } | |
762 | ||
763 | if (job_id) { | |
764 | if (flags & BLOCK_JOB_INTERNAL) { | |
765 | error_setg(errp, "Cannot specify job ID for internal block job"); | |
766 | return NULL; | |
767 | } | |
768 | ||
769 | if (!id_wellformed(job_id)) { | |
770 | error_setg(errp, "Invalid job ID '%s'", job_id); | |
771 | return NULL; | |
772 | } | |
773 | ||
774 | if (block_job_get(job_id)) { | |
775 | error_setg(errp, "Job ID '%s' already in use", job_id); | |
776 | return NULL; | |
777 | } | |
778 | } | |
779 | ||
780 | blk = blk_new(perm, shared_perm); | |
781 | ret = blk_insert_bs(blk, bs, errp); | |
782 | if (ret < 0) { | |
783 | blk_unref(blk); | |
784 | return NULL; | |
785 | } | |
786 | ||
787 | job = g_malloc0(driver->instance_size); | |
788 | job->driver = driver; | |
789 | job->id = g_strdup(job_id); | |
790 | job->blk = blk; | |
791 | job->cb = cb; | |
792 | job->opaque = opaque; | |
793 | job->busy = false; | |
794 | job->paused = true; | |
795 | job->pause_count = 1; | |
796 | job->refcnt = 1; | |
c9de4050 | 797 | block_job_state_transition(job, BLOCK_JOB_STATUS_CREATED); |
fc24908e PB |
798 | aio_timer_init(qemu_get_aio_context(), &job->sleep_timer, |
799 | QEMU_CLOCK_REALTIME, SCALE_NS, | |
800 | block_job_sleep_timer_cb, job); | |
88691b37 PB |
801 | |
802 | error_setg(&job->blocker, "block device is in use by block job: %s", | |
977c736f | 803 | BlockJobType_str(driver->job_type)); |
88691b37 PB |
804 | block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort); |
805 | bs->job = job; | |
806 | ||
88691b37 PB |
807 | bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); |
808 | ||
809 | QLIST_INSERT_HEAD(&block_jobs, job, job_list); | |
810 | ||
811 | blk_add_aio_context_notifier(blk, block_job_attached_aio_context, | |
812 | block_job_detach_aio_context, job); | |
813 | ||
814 | /* Only set speed when necessary to avoid NotSupported error */ | |
815 | if (speed != 0) { | |
816 | Error *local_err = NULL; | |
817 | ||
818 | block_job_set_speed(job, speed, &local_err); | |
819 | if (local_err) { | |
820 | block_job_unref(job); | |
821 | error_propagate(errp, local_err); | |
822 | return NULL; | |
823 | } | |
824 | } | |
75859b94 JS |
825 | |
826 | /* Single jobs are modeled as single-job transactions for sake of | |
827 | * consolidating the job management logic */ | |
828 | if (!txn) { | |
829 | txn = block_job_txn_new(); | |
830 | block_job_txn_add_job(txn, job); | |
831 | block_job_txn_unref(txn); | |
832 | } else { | |
833 | block_job_txn_add_job(txn, job); | |
834 | } | |
835 | ||
88691b37 PB |
836 | return job; |
837 | } | |
838 | ||
f321dcb5 PB |
839 | void block_job_pause_all(void) |
840 | { | |
841 | BlockJob *job = NULL; | |
842 | while ((job = block_job_next(job))) { | |
843 | AioContext *aio_context = blk_get_aio_context(job->blk); | |
844 | ||
845 | aio_context_acquire(aio_context); | |
3d5d319e | 846 | block_job_ref(job); |
f321dcb5 PB |
847 | block_job_pause(job); |
848 | aio_context_release(aio_context); | |
849 | } | |
850 | } | |
851 | ||
88691b37 PB |
852 | void block_job_early_fail(BlockJob *job) |
853 | { | |
854 | block_job_unref(job); | |
855 | } | |
856 | ||
857 | void block_job_completed(BlockJob *job, int ret) | |
858 | { | |
75859b94 | 859 | assert(job && job->txn && !job->completed); |
88691b37 | 860 | assert(blk_bs(job->blk)->job == job); |
88691b37 PB |
861 | job->completed = true; |
862 | job->ret = ret; | |
75859b94 | 863 | if (ret < 0 || block_job_is_cancelled(job)) { |
88691b37 PB |
864 | block_job_completed_txn_abort(job); |
865 | } else { | |
866 | block_job_completed_txn_success(job); | |
867 | } | |
868 | } | |
869 | ||
870 | static bool block_job_should_pause(BlockJob *job) | |
871 | { | |
872 | return job->pause_count > 0; | |
873 | } | |
874 | ||
fc24908e PB |
875 | /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds. |
876 | * Reentering the job coroutine with block_job_enter() before the timer has | |
877 | * expired is allowed and cancels the timer. | |
878 | * | |
879 | * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be | |
880 | * called explicitly. */ | |
881 | static void block_job_do_yield(BlockJob *job, uint64_t ns) | |
356f59b8 | 882 | { |
fc24908e PB |
883 | block_job_lock(); |
884 | if (ns != -1) { | |
885 | timer_mod(&job->sleep_timer, ns); | |
886 | } | |
356f59b8 | 887 | job->busy = false; |
fc24908e | 888 | block_job_unlock(); |
356f59b8 PB |
889 | qemu_coroutine_yield(); |
890 | ||
891 | /* Set by block_job_enter before re-entering the coroutine. */ | |
892 | assert(job->busy); | |
893 | } | |
894 | ||
88691b37 PB |
895 | void coroutine_fn block_job_pause_point(BlockJob *job) |
896 | { | |
897 | assert(job && block_job_started(job)); | |
898 | ||
899 | if (!block_job_should_pause(job)) { | |
900 | return; | |
901 | } | |
902 | if (block_job_is_cancelled(job)) { | |
903 | return; | |
904 | } | |
905 | ||
906 | if (job->driver->pause) { | |
907 | job->driver->pause(job); | |
908 | } | |
909 | ||
910 | if (block_job_should_pause(job) && !block_job_is_cancelled(job)) { | |
58b295ba | 911 | BlockJobStatus status = job->status; |
c9de4050 JS |
912 | block_job_state_transition(job, status == BLOCK_JOB_STATUS_READY ? \ |
913 | BLOCK_JOB_STATUS_STANDBY : \ | |
914 | BLOCK_JOB_STATUS_PAUSED); | |
88691b37 | 915 | job->paused = true; |
fc24908e | 916 | block_job_do_yield(job, -1); |
88691b37 | 917 | job->paused = false; |
c9de4050 | 918 | block_job_state_transition(job, status); |
88691b37 PB |
919 | } |
920 | ||
921 | if (job->driver->resume) { | |
922 | job->driver->resume(job); | |
923 | } | |
924 | } | |
925 | ||
f321dcb5 PB |
926 | void block_job_resume_all(void) |
927 | { | |
3d5d319e AG |
928 | BlockJob *job, *next; |
929 | ||
930 | QLIST_FOREACH_SAFE(job, &block_jobs, job_list, next) { | |
f321dcb5 PB |
931 | AioContext *aio_context = blk_get_aio_context(job->blk); |
932 | ||
933 | aio_context_acquire(aio_context); | |
934 | block_job_resume(job); | |
3d5d319e | 935 | block_job_unref(job); |
f321dcb5 PB |
936 | aio_context_release(aio_context); |
937 | } | |
938 | } | |
939 | ||
aa9ef2e6 JS |
940 | /* |
941 | * Conditionally enter a block_job pending a call to fn() while | |
942 | * under the block_job_lock critical section. | |
943 | */ | |
944 | static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job)) | |
88691b37 | 945 | { |
eb05e011 PB |
946 | if (!block_job_started(job)) { |
947 | return; | |
948 | } | |
949 | if (job->deferred_to_main_loop) { | |
950 | return; | |
951 | } | |
952 | ||
fc24908e | 953 | block_job_lock(); |
356f59b8 | 954 | if (job->busy) { |
fc24908e | 955 | block_job_unlock(); |
356f59b8 | 956 | return; |
88691b37 | 957 | } |
356f59b8 | 958 | |
aa9ef2e6 JS |
959 | if (fn && !fn(job)) { |
960 | block_job_unlock(); | |
961 | return; | |
962 | } | |
963 | ||
fc24908e PB |
964 | assert(!job->deferred_to_main_loop); |
965 | timer_del(&job->sleep_timer); | |
356f59b8 | 966 | job->busy = true; |
fc24908e | 967 | block_job_unlock(); |
356f59b8 | 968 | aio_co_wake(job->co); |
88691b37 PB |
969 | } |
970 | ||
aa9ef2e6 JS |
971 | void block_job_enter(BlockJob *job) |
972 | { | |
973 | block_job_enter_cond(job, NULL); | |
974 | } | |
975 | ||
88691b37 PB |
976 | bool block_job_is_cancelled(BlockJob *job) |
977 | { | |
978 | return job->cancelled; | |
979 | } | |
980 | ||
5bf1d5a7 | 981 | void block_job_sleep_ns(BlockJob *job, int64_t ns) |
88691b37 PB |
982 | { |
983 | assert(job->busy); | |
984 | ||
985 | /* Check cancellation *before* setting busy = false, too! */ | |
986 | if (block_job_is_cancelled(job)) { | |
987 | return; | |
988 | } | |
989 | ||
88691b37 | 990 | if (!block_job_should_pause(job)) { |
fc24908e | 991 | block_job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns); |
88691b37 | 992 | } |
88691b37 PB |
993 | |
994 | block_job_pause_point(job); | |
995 | } | |
996 | ||
997 | void block_job_yield(BlockJob *job) | |
998 | { | |
999 | assert(job->busy); | |
1000 | ||
1001 | /* Check cancellation *before* setting busy = false, too! */ | |
1002 | if (block_job_is_cancelled(job)) { | |
1003 | return; | |
1004 | } | |
1005 | ||
88691b37 | 1006 | if (!block_job_should_pause(job)) { |
fc24908e | 1007 | block_job_do_yield(job, -1); |
88691b37 | 1008 | } |
88691b37 PB |
1009 | |
1010 | block_job_pause_point(job); | |
1011 | } | |
1012 | ||
2caf63a9 PB |
1013 | void block_job_iostatus_reset(BlockJob *job) |
1014 | { | |
4c241cf5 PB |
1015 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
1016 | return; | |
1017 | } | |
1018 | assert(job->user_paused && job->pause_count > 0); | |
2caf63a9 PB |
1019 | job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
1020 | } | |
1021 | ||
bcada37b | 1022 | void block_job_event_ready(BlockJob *job) |
a66a2a36 | 1023 | { |
c9de4050 | 1024 | block_job_state_transition(job, BLOCK_JOB_STATUS_READY); |
ef6dbf1e HR |
1025 | job->ready = true; |
1026 | ||
559b935f JS |
1027 | if (block_job_is_internal(job)) { |
1028 | return; | |
1029 | } | |
1030 | ||
518848a2 | 1031 | qapi_event_send_block_job_ready(job->driver->job_type, |
8ccb9569 | 1032 | job->id, |
518848a2 MA |
1033 | job->len, |
1034 | job->offset, | |
1035 | job->speed, &error_abort); | |
a66a2a36 PB |
1036 | } |
1037 | ||
81e254dc | 1038 | BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err, |
32c81a4a PB |
1039 | int is_read, int error) |
1040 | { | |
1041 | BlockErrorAction action; | |
1042 | ||
1043 | switch (on_err) { | |
1044 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
8c398252 | 1045 | case BLOCKDEV_ON_ERROR_AUTO: |
a589569f WX |
1046 | action = (error == ENOSPC) ? |
1047 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
32c81a4a PB |
1048 | break; |
1049 | case BLOCKDEV_ON_ERROR_STOP: | |
a589569f | 1050 | action = BLOCK_ERROR_ACTION_STOP; |
32c81a4a PB |
1051 | break; |
1052 | case BLOCKDEV_ON_ERROR_REPORT: | |
a589569f | 1053 | action = BLOCK_ERROR_ACTION_REPORT; |
32c81a4a PB |
1054 | break; |
1055 | case BLOCKDEV_ON_ERROR_IGNORE: | |
a589569f | 1056 | action = BLOCK_ERROR_ACTION_IGNORE; |
32c81a4a PB |
1057 | break; |
1058 | default: | |
1059 | abort(); | |
1060 | } | |
559b935f JS |
1061 | if (!block_job_is_internal(job)) { |
1062 | qapi_event_send_block_job_error(job->id, | |
1063 | is_read ? IO_OPERATION_TYPE_READ : | |
1064 | IO_OPERATION_TYPE_WRITE, | |
1065 | action, &error_abort); | |
1066 | } | |
a589569f | 1067 | if (action == BLOCK_ERROR_ACTION_STOP) { |
0ec4dfb8 | 1068 | block_job_pause(job); |
751ebd76 | 1069 | /* make the pause user visible, which will be resumed from QMP. */ |
0ec4dfb8 | 1070 | job->user_paused = true; |
32c81a4a | 1071 | block_job_iostatus_set_err(job, error); |
32c81a4a PB |
1072 | } |
1073 | return action; | |
1074 | } | |
dec7d421 SH |
1075 | |
1076 | typedef struct { | |
1077 | BlockJob *job; | |
dec7d421 SH |
1078 | AioContext *aio_context; |
1079 | BlockJobDeferToMainLoopFn *fn; | |
1080 | void *opaque; | |
1081 | } BlockJobDeferToMainLoopData; | |
1082 | ||
1083 | static void block_job_defer_to_main_loop_bh(void *opaque) | |
1084 | { | |
1085 | BlockJobDeferToMainLoopData *data = opaque; | |
1086 | AioContext *aio_context; | |
1087 | ||
dec7d421 SH |
1088 | /* Prevent race with block_job_defer_to_main_loop() */ |
1089 | aio_context_acquire(data->aio_context); | |
1090 | ||
1091 | /* Fetch BDS AioContext again, in case it has changed */ | |
b6d2e599 | 1092 | aio_context = blk_get_aio_context(data->job->blk); |
d79df2a2 PB |
1093 | if (aio_context != data->aio_context) { |
1094 | aio_context_acquire(aio_context); | |
1095 | } | |
dec7d421 SH |
1096 | |
1097 | data->fn(data->job, data->opaque); | |
1098 | ||
d79df2a2 PB |
1099 | if (aio_context != data->aio_context) { |
1100 | aio_context_release(aio_context); | |
1101 | } | |
dec7d421 SH |
1102 | |
1103 | aio_context_release(data->aio_context); | |
1104 | ||
1105 | g_free(data); | |
1106 | } | |
1107 | ||
1108 | void block_job_defer_to_main_loop(BlockJob *job, | |
1109 | BlockJobDeferToMainLoopFn *fn, | |
1110 | void *opaque) | |
1111 | { | |
1112 | BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); | |
1113 | data->job = job; | |
b6d2e599 | 1114 | data->aio_context = blk_get_aio_context(job->blk); |
dec7d421 SH |
1115 | data->fn = fn; |
1116 | data->opaque = opaque; | |
794f0141 | 1117 | job->deferred_to_main_loop = true; |
dec7d421 | 1118 | |
fffb6e12 PB |
1119 | aio_bh_schedule_oneshot(qemu_get_aio_context(), |
1120 | block_job_defer_to_main_loop_bh, data); | |
dec7d421 | 1121 | } |