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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 PB |
27 | #include "qemu-common.h" |
28 | #include "trace.h" | |
737e150e PB |
29 | #include "block/block.h" |
30 | #include "block/blockjob.h" | |
31 | #include "block/block_int.h" | |
373340b2 | 32 | #include "sysemu/block-backend.h" |
cc7a8ea7 | 33 | #include "qapi/qmp/qerror.h" |
7b1b5d19 | 34 | #include "qapi/qmp/qjson.h" |
10817bf0 | 35 | #include "qemu/coroutine.h" |
2f0c9fe6 | 36 | #include "qmp-commands.h" |
1de7afc9 | 37 | #include "qemu/timer.h" |
5a2d2cbd | 38 | #include "qapi-event.h" |
2f0c9fe6 | 39 | |
c55a832f FZ |
40 | /* Transactional group of block jobs */ |
41 | struct BlockJobTxn { | |
42 | ||
43 | /* Is this txn being cancelled? */ | |
44 | bool aborting; | |
45 | ||
46 | /* List of jobs */ | |
47 | QLIST_HEAD(, BlockJob) jobs; | |
48 | ||
49 | /* Reference count */ | |
50 | int refcnt; | |
51 | }; | |
52 | ||
a7112795 AG |
53 | static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs); |
54 | ||
55 | BlockJob *block_job_next(BlockJob *job) | |
56 | { | |
57 | if (!job) { | |
58 | return QLIST_FIRST(&block_jobs); | |
59 | } | |
60 | return QLIST_NEXT(job, job_list); | |
61 | } | |
62 | ||
ffb1f10c AG |
63 | BlockJob *block_job_get(const char *id) |
64 | { | |
65 | BlockJob *job; | |
66 | ||
67 | QLIST_FOREACH(job, &block_jobs, job_list) { | |
68 | if (!strcmp(id, job->id)) { | |
69 | return job; | |
70 | } | |
71 | } | |
72 | ||
73 | return NULL; | |
74 | } | |
75 | ||
9f6bc648 SH |
76 | /* Normally the job runs in its BlockBackend's AioContext. The exception is |
77 | * block_job_defer_to_main_loop() where it runs in the QEMU main loop. Code | |
78 | * that supports both cases uses this helper function. | |
79 | */ | |
80 | static AioContext *block_job_get_aio_context(BlockJob *job) | |
81 | { | |
82 | return job->deferred_to_main_loop ? | |
83 | qemu_get_aio_context() : | |
84 | blk_get_aio_context(job->blk); | |
85 | } | |
86 | ||
463e0be1 SH |
87 | static void block_job_attached_aio_context(AioContext *new_context, |
88 | void *opaque) | |
89 | { | |
90 | BlockJob *job = opaque; | |
91 | ||
92 | if (job->driver->attached_aio_context) { | |
93 | job->driver->attached_aio_context(job, new_context); | |
94 | } | |
95 | ||
96 | block_job_resume(job); | |
97 | } | |
98 | ||
99 | static void block_job_detach_aio_context(void *opaque) | |
100 | { | |
101 | BlockJob *job = opaque; | |
102 | ||
103 | /* In case the job terminates during aio_poll()... */ | |
104 | block_job_ref(job); | |
105 | ||
106 | block_job_pause(job); | |
107 | ||
108 | if (!job->paused) { | |
109 | /* If job is !job->busy this kicks it into the next pause point. */ | |
110 | block_job_enter(job); | |
111 | } | |
112 | while (!job->paused && !job->completed) { | |
113 | aio_poll(block_job_get_aio_context(job), true); | |
114 | } | |
115 | ||
116 | block_job_unref(job); | |
117 | } | |
118 | ||
3fc4b10a | 119 | void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs, |
097310b5 | 120 | int64_t speed, BlockCompletionFunc *cb, |
2f0c9fe6 PB |
121 | void *opaque, Error **errp) |
122 | { | |
b6d2e599 | 123 | BlockBackend *blk; |
2f0c9fe6 PB |
124 | BlockJob *job; |
125 | ||
b48100cf | 126 | assert(cb); |
628ff683 | 127 | if (bs->job) { |
c6bd8c70 | 128 | error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); |
2f0c9fe6 PB |
129 | return NULL; |
130 | } | |
b6d2e599 KW |
131 | |
132 | blk = blk_new(); | |
133 | blk_insert_bs(blk, bs); | |
134 | ||
3fc4b10a | 135 | job = g_malloc0(driver->instance_size); |
3718d8ab FZ |
136 | error_setg(&job->blocker, "block device is in use by block job: %s", |
137 | BlockJobType_lookup[driver->job_type]); | |
138 | bdrv_op_block_all(bs, job->blocker); | |
b112a65c | 139 | bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); |
3718d8ab | 140 | |
3fc4b10a | 141 | job->driver = driver; |
8ccb9569 | 142 | job->id = g_strdup(bdrv_get_device_name(bs)); |
b6d2e599 | 143 | job->blk = blk; |
2f0c9fe6 PB |
144 | job->cb = cb; |
145 | job->opaque = opaque; | |
146 | job->busy = true; | |
18930ba3 | 147 | job->refcnt = 1; |
2f0c9fe6 PB |
148 | bs->job = job; |
149 | ||
a7112795 AG |
150 | QLIST_INSERT_HEAD(&block_jobs, job, job_list); |
151 | ||
463e0be1 SH |
152 | blk_add_aio_context_notifier(blk, block_job_attached_aio_context, |
153 | block_job_detach_aio_context, job); | |
154 | ||
2f0c9fe6 PB |
155 | /* Only set speed when necessary to avoid NotSupported error */ |
156 | if (speed != 0) { | |
157 | Error *local_err = NULL; | |
158 | ||
159 | block_job_set_speed(job, speed, &local_err); | |
84d18f06 | 160 | if (local_err) { |
18930ba3 | 161 | block_job_unref(job); |
2f0c9fe6 PB |
162 | error_propagate(errp, local_err); |
163 | return NULL; | |
164 | } | |
165 | } | |
166 | return job; | |
167 | } | |
168 | ||
18930ba3 | 169 | void block_job_ref(BlockJob *job) |
2f0c9fe6 | 170 | { |
18930ba3 FZ |
171 | ++job->refcnt; |
172 | } | |
2f0c9fe6 | 173 | |
18930ba3 FZ |
174 | void block_job_unref(BlockJob *job) |
175 | { | |
176 | if (--job->refcnt == 0) { | |
b6d2e599 KW |
177 | BlockDriverState *bs = blk_bs(job->blk); |
178 | bs->job = NULL; | |
179 | bdrv_op_unblock_all(bs, job->blocker); | |
463e0be1 SH |
180 | blk_remove_aio_context_notifier(job->blk, |
181 | block_job_attached_aio_context, | |
182 | block_job_detach_aio_context, job); | |
b6d2e599 | 183 | blk_unref(job->blk); |
18930ba3 FZ |
184 | error_free(job->blocker); |
185 | g_free(job->id); | |
a7112795 | 186 | QLIST_REMOVE(job, job_list); |
18930ba3 FZ |
187 | g_free(job); |
188 | } | |
2f0c9fe6 PB |
189 | } |
190 | ||
c55a832f FZ |
191 | static void block_job_completed_single(BlockJob *job) |
192 | { | |
193 | if (!job->ret) { | |
194 | if (job->driver->commit) { | |
195 | job->driver->commit(job); | |
196 | } | |
197 | } else { | |
198 | if (job->driver->abort) { | |
199 | job->driver->abort(job); | |
200 | } | |
201 | } | |
202 | job->cb(job->opaque, job->ret); | |
203 | if (job->txn) { | |
204 | block_job_txn_unref(job->txn); | |
205 | } | |
206 | block_job_unref(job); | |
207 | } | |
208 | ||
209 | static void block_job_completed_txn_abort(BlockJob *job) | |
210 | { | |
211 | AioContext *ctx; | |
212 | BlockJobTxn *txn = job->txn; | |
213 | BlockJob *other_job, *next; | |
214 | ||
215 | if (txn->aborting) { | |
216 | /* | |
217 | * We are cancelled by another job, which will handle everything. | |
218 | */ | |
219 | return; | |
220 | } | |
221 | txn->aborting = true; | |
222 | /* We are the first failed job. Cancel other jobs. */ | |
223 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
b6d2e599 | 224 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
225 | aio_context_acquire(ctx); |
226 | } | |
227 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
228 | if (other_job == job || other_job->completed) { | |
229 | /* Other jobs are "effectively" cancelled by us, set the status for | |
230 | * them; this job, however, may or may not be cancelled, depending | |
231 | * on the caller, so leave it. */ | |
232 | if (other_job != job) { | |
233 | other_job->cancelled = true; | |
234 | } | |
235 | continue; | |
236 | } | |
237 | block_job_cancel_sync(other_job); | |
238 | assert(other_job->completed); | |
239 | } | |
240 | QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { | |
b6d2e599 | 241 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
242 | block_job_completed_single(other_job); |
243 | aio_context_release(ctx); | |
244 | } | |
245 | } | |
246 | ||
247 | static void block_job_completed_txn_success(BlockJob *job) | |
248 | { | |
249 | AioContext *ctx; | |
250 | BlockJobTxn *txn = job->txn; | |
251 | BlockJob *other_job, *next; | |
252 | /* | |
253 | * Successful completion, see if there are other running jobs in this | |
254 | * txn. | |
255 | */ | |
256 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
257 | if (!other_job->completed) { | |
258 | return; | |
259 | } | |
260 | } | |
261 | /* We are the last completed job, commit the transaction. */ | |
262 | QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { | |
b6d2e599 | 263 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
264 | aio_context_acquire(ctx); |
265 | assert(other_job->ret == 0); | |
266 | block_job_completed_single(other_job); | |
267 | aio_context_release(ctx); | |
268 | } | |
269 | } | |
270 | ||
97031164 TW |
271 | void block_job_completed(BlockJob *job, int ret) |
272 | { | |
b6d2e599 | 273 | assert(blk_bs(job->blk)->job == job); |
a689dbf2 FZ |
274 | assert(!job->completed); |
275 | job->completed = true; | |
276 | job->ret = ret; | |
c55a832f FZ |
277 | if (!job->txn) { |
278 | block_job_completed_single(job); | |
279 | } else if (ret < 0 || block_job_is_cancelled(job)) { | |
280 | block_job_completed_txn_abort(job); | |
281 | } else { | |
282 | block_job_completed_txn_success(job); | |
283 | } | |
97031164 TW |
284 | } |
285 | ||
2f0c9fe6 PB |
286 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
287 | { | |
288 | Error *local_err = NULL; | |
289 | ||
3fc4b10a | 290 | if (!job->driver->set_speed) { |
c6bd8c70 | 291 | error_setg(errp, QERR_UNSUPPORTED); |
2f0c9fe6 PB |
292 | return; |
293 | } | |
3fc4b10a | 294 | job->driver->set_speed(job, speed, &local_err); |
84d18f06 | 295 | if (local_err) { |
2f0c9fe6 PB |
296 | error_propagate(errp, local_err); |
297 | return; | |
298 | } | |
299 | ||
300 | job->speed = speed; | |
301 | } | |
302 | ||
aeae883b PB |
303 | void block_job_complete(BlockJob *job, Error **errp) |
304 | { | |
751ebd76 | 305 | if (job->pause_count || job->cancelled || !job->driver->complete) { |
9df229c3 AG |
306 | error_setg(errp, "The active block job '%s' cannot be completed", |
307 | job->id); | |
aeae883b PB |
308 | return; |
309 | } | |
310 | ||
3fc4b10a | 311 | job->driver->complete(job, errp); |
aeae883b PB |
312 | } |
313 | ||
8acc72a4 | 314 | void block_job_pause(BlockJob *job) |
2f0c9fe6 | 315 | { |
751ebd76 | 316 | job->pause_count++; |
8acc72a4 PB |
317 | } |
318 | ||
a7f3b7ff | 319 | static bool block_job_should_pause(BlockJob *job) |
8acc72a4 | 320 | { |
751ebd76 | 321 | return job->pause_count > 0; |
8acc72a4 PB |
322 | } |
323 | ||
fc9c0a9c SH |
324 | void coroutine_fn block_job_pause_point(BlockJob *job) |
325 | { | |
326 | if (!block_job_should_pause(job)) { | |
327 | return; | |
328 | } | |
329 | if (block_job_is_cancelled(job)) { | |
330 | return; | |
331 | } | |
332 | ||
333 | if (job->driver->pause) { | |
334 | job->driver->pause(job); | |
335 | } | |
336 | ||
337 | if (block_job_should_pause(job) && !block_job_is_cancelled(job)) { | |
338 | job->paused = true; | |
339 | job->busy = false; | |
340 | qemu_coroutine_yield(); /* wait for block_job_resume() */ | |
341 | job->busy = true; | |
342 | job->paused = false; | |
343 | } | |
344 | ||
345 | if (job->driver->resume) { | |
346 | job->driver->resume(job); | |
347 | } | |
348 | } | |
349 | ||
8acc72a4 PB |
350 | void block_job_resume(BlockJob *job) |
351 | { | |
751ebd76 FZ |
352 | assert(job->pause_count > 0); |
353 | job->pause_count--; | |
354 | if (job->pause_count) { | |
355 | return; | |
356 | } | |
357 | block_job_enter(job); | |
358 | } | |
359 | ||
360 | void block_job_enter(BlockJob *job) | |
361 | { | |
2f0c9fe6 PB |
362 | if (job->co && !job->busy) { |
363 | qemu_coroutine_enter(job->co, NULL); | |
364 | } | |
365 | } | |
366 | ||
8acc72a4 PB |
367 | void block_job_cancel(BlockJob *job) |
368 | { | |
369 | job->cancelled = true; | |
17bd51f9 | 370 | block_job_iostatus_reset(job); |
751ebd76 | 371 | block_job_enter(job); |
8acc72a4 PB |
372 | } |
373 | ||
2f0c9fe6 PB |
374 | bool block_job_is_cancelled(BlockJob *job) |
375 | { | |
376 | return job->cancelled; | |
377 | } | |
378 | ||
32c81a4a PB |
379 | void block_job_iostatus_reset(BlockJob *job) |
380 | { | |
381 | job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
3fc4b10a FZ |
382 | if (job->driver->iostatus_reset) { |
383 | job->driver->iostatus_reset(job); | |
3bd293c3 | 384 | } |
32c81a4a PB |
385 | } |
386 | ||
345f9e1b HR |
387 | static int block_job_finish_sync(BlockJob *job, |
388 | void (*finish)(BlockJob *, Error **errp), | |
389 | Error **errp) | |
2f0c9fe6 | 390 | { |
345f9e1b | 391 | Error *local_err = NULL; |
94db6d2d | 392 | int ret; |
2f0c9fe6 | 393 | |
b6d2e599 | 394 | assert(blk_bs(job->blk)->job == job); |
2f0c9fe6 | 395 | |
94db6d2d | 396 | block_job_ref(job); |
345f9e1b HR |
397 | finish(job, &local_err); |
398 | if (local_err) { | |
399 | error_propagate(errp, local_err); | |
94db6d2d | 400 | block_job_unref(job); |
345f9e1b HR |
401 | return -EBUSY; |
402 | } | |
94db6d2d | 403 | while (!job->completed) { |
9f6bc648 | 404 | aio_poll(block_job_get_aio_context(job), true); |
2f0c9fe6 | 405 | } |
94db6d2d FZ |
406 | ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret; |
407 | block_job_unref(job); | |
408 | return ret; | |
2f0c9fe6 PB |
409 | } |
410 | ||
345f9e1b HR |
411 | /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be |
412 | * used with block_job_finish_sync() without the need for (rather nasty) | |
413 | * function pointer casts there. */ | |
414 | static void block_job_cancel_err(BlockJob *job, Error **errp) | |
415 | { | |
416 | block_job_cancel(job); | |
417 | } | |
418 | ||
419 | int block_job_cancel_sync(BlockJob *job) | |
420 | { | |
421 | return block_job_finish_sync(job, &block_job_cancel_err, NULL); | |
422 | } | |
423 | ||
a1a2af07 KW |
424 | void block_job_cancel_sync_all(void) |
425 | { | |
426 | BlockJob *job; | |
427 | AioContext *aio_context; | |
428 | ||
429 | while ((job = QLIST_FIRST(&block_jobs))) { | |
b6d2e599 | 430 | aio_context = blk_get_aio_context(job->blk); |
a1a2af07 KW |
431 | aio_context_acquire(aio_context); |
432 | block_job_cancel_sync(job); | |
433 | aio_context_release(aio_context); | |
434 | } | |
435 | } | |
436 | ||
345f9e1b HR |
437 | int block_job_complete_sync(BlockJob *job, Error **errp) |
438 | { | |
439 | return block_job_finish_sync(job, &block_job_complete, errp); | |
440 | } | |
441 | ||
7483d1e5 | 442 | void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns) |
2f0c9fe6 | 443 | { |
8acc72a4 PB |
444 | assert(job->busy); |
445 | ||
2f0c9fe6 | 446 | /* Check cancellation *before* setting busy = false, too! */ |
8acc72a4 PB |
447 | if (block_job_is_cancelled(job)) { |
448 | return; | |
449 | } | |
450 | ||
451 | job->busy = false; | |
a7f3b7ff | 452 | if (!block_job_should_pause(job)) { |
0824afda AG |
453 | co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns); |
454 | } | |
8acc72a4 | 455 | job->busy = true; |
fc9c0a9c SH |
456 | |
457 | block_job_pause_point(job); | |
2f0c9fe6 | 458 | } |
30e628b7 | 459 | |
dc71ce45 FZ |
460 | void block_job_yield(BlockJob *job) |
461 | { | |
462 | assert(job->busy); | |
463 | ||
464 | /* Check cancellation *before* setting busy = false, too! */ | |
465 | if (block_job_is_cancelled(job)) { | |
466 | return; | |
467 | } | |
468 | ||
469 | job->busy = false; | |
fc9c0a9c SH |
470 | if (!block_job_should_pause(job)) { |
471 | qemu_coroutine_yield(); | |
472 | } | |
dc71ce45 | 473 | job->busy = true; |
fc9c0a9c SH |
474 | |
475 | block_job_pause_point(job); | |
dc71ce45 FZ |
476 | } |
477 | ||
30e628b7 PB |
478 | BlockJobInfo *block_job_query(BlockJob *job) |
479 | { | |
480 | BlockJobInfo *info = g_new0(BlockJobInfo, 1); | |
79e14bf7 | 481 | info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]); |
8ccb9569 | 482 | info->device = g_strdup(job->id); |
32c81a4a PB |
483 | info->len = job->len; |
484 | info->busy = job->busy; | |
751ebd76 | 485 | info->paused = job->pause_count > 0; |
32c81a4a PB |
486 | info->offset = job->offset; |
487 | info->speed = job->speed; | |
488 | info->io_status = job->iostatus; | |
ef6dbf1e | 489 | info->ready = job->ready; |
30e628b7 PB |
490 | return info; |
491 | } | |
32c81a4a PB |
492 | |
493 | static void block_job_iostatus_set_err(BlockJob *job, int error) | |
494 | { | |
495 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
496 | job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
497 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
498 | } | |
499 | } | |
500 | ||
bcada37b WX |
501 | void block_job_event_cancelled(BlockJob *job) |
502 | { | |
503 | qapi_event_send_block_job_cancelled(job->driver->job_type, | |
8ccb9569 | 504 | job->id, |
bcada37b WX |
505 | job->len, |
506 | job->offset, | |
507 | job->speed, | |
508 | &error_abort); | |
509 | } | |
32c81a4a | 510 | |
bcada37b | 511 | void block_job_event_completed(BlockJob *job, const char *msg) |
a66a2a36 | 512 | { |
bcada37b | 513 | qapi_event_send_block_job_completed(job->driver->job_type, |
8ccb9569 | 514 | job->id, |
bcada37b WX |
515 | job->len, |
516 | job->offset, | |
517 | job->speed, | |
518 | !!msg, | |
519 | msg, | |
520 | &error_abort); | |
a66a2a36 PB |
521 | } |
522 | ||
bcada37b | 523 | void block_job_event_ready(BlockJob *job) |
a66a2a36 | 524 | { |
ef6dbf1e HR |
525 | job->ready = true; |
526 | ||
518848a2 | 527 | qapi_event_send_block_job_ready(job->driver->job_type, |
8ccb9569 | 528 | job->id, |
518848a2 MA |
529 | job->len, |
530 | job->offset, | |
531 | job->speed, &error_abort); | |
a66a2a36 PB |
532 | } |
533 | ||
81e254dc | 534 | BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err, |
32c81a4a PB |
535 | int is_read, int error) |
536 | { | |
537 | BlockErrorAction action; | |
538 | ||
539 | switch (on_err) { | |
540 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
a589569f WX |
541 | action = (error == ENOSPC) ? |
542 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
32c81a4a PB |
543 | break; |
544 | case BLOCKDEV_ON_ERROR_STOP: | |
a589569f | 545 | action = BLOCK_ERROR_ACTION_STOP; |
32c81a4a PB |
546 | break; |
547 | case BLOCKDEV_ON_ERROR_REPORT: | |
a589569f | 548 | action = BLOCK_ERROR_ACTION_REPORT; |
32c81a4a PB |
549 | break; |
550 | case BLOCKDEV_ON_ERROR_IGNORE: | |
a589569f | 551 | action = BLOCK_ERROR_ACTION_IGNORE; |
32c81a4a PB |
552 | break; |
553 | default: | |
554 | abort(); | |
555 | } | |
8ccb9569 | 556 | qapi_event_send_block_job_error(job->id, |
5a2d2cbd WX |
557 | is_read ? IO_OPERATION_TYPE_READ : |
558 | IO_OPERATION_TYPE_WRITE, | |
559 | action, &error_abort); | |
a589569f | 560 | if (action == BLOCK_ERROR_ACTION_STOP) { |
751ebd76 FZ |
561 | /* make the pause user visible, which will be resumed from QMP. */ |
562 | job->user_paused = true; | |
32c81a4a PB |
563 | block_job_pause(job); |
564 | block_job_iostatus_set_err(job, error); | |
32c81a4a PB |
565 | } |
566 | return action; | |
567 | } | |
dec7d421 SH |
568 | |
569 | typedef struct { | |
570 | BlockJob *job; | |
571 | QEMUBH *bh; | |
572 | AioContext *aio_context; | |
573 | BlockJobDeferToMainLoopFn *fn; | |
574 | void *opaque; | |
575 | } BlockJobDeferToMainLoopData; | |
576 | ||
577 | static void block_job_defer_to_main_loop_bh(void *opaque) | |
578 | { | |
579 | BlockJobDeferToMainLoopData *data = opaque; | |
580 | AioContext *aio_context; | |
581 | ||
582 | qemu_bh_delete(data->bh); | |
583 | ||
584 | /* Prevent race with block_job_defer_to_main_loop() */ | |
585 | aio_context_acquire(data->aio_context); | |
586 | ||
587 | /* Fetch BDS AioContext again, in case it has changed */ | |
b6d2e599 | 588 | aio_context = blk_get_aio_context(data->job->blk); |
dec7d421 SH |
589 | aio_context_acquire(aio_context); |
590 | ||
794f0141 | 591 | data->job->deferred_to_main_loop = false; |
dec7d421 SH |
592 | data->fn(data->job, data->opaque); |
593 | ||
594 | aio_context_release(aio_context); | |
595 | ||
596 | aio_context_release(data->aio_context); | |
597 | ||
598 | g_free(data); | |
599 | } | |
600 | ||
601 | void block_job_defer_to_main_loop(BlockJob *job, | |
602 | BlockJobDeferToMainLoopFn *fn, | |
603 | void *opaque) | |
604 | { | |
605 | BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); | |
606 | data->job = job; | |
607 | data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data); | |
b6d2e599 | 608 | data->aio_context = blk_get_aio_context(job->blk); |
dec7d421 SH |
609 | data->fn = fn; |
610 | data->opaque = opaque; | |
794f0141 | 611 | job->deferred_to_main_loop = true; |
dec7d421 SH |
612 | |
613 | qemu_bh_schedule(data->bh); | |
614 | } | |
c55a832f FZ |
615 | |
616 | BlockJobTxn *block_job_txn_new(void) | |
617 | { | |
618 | BlockJobTxn *txn = g_new0(BlockJobTxn, 1); | |
619 | QLIST_INIT(&txn->jobs); | |
620 | txn->refcnt = 1; | |
621 | return txn; | |
622 | } | |
623 | ||
624 | static void block_job_txn_ref(BlockJobTxn *txn) | |
625 | { | |
626 | txn->refcnt++; | |
627 | } | |
628 | ||
629 | void block_job_txn_unref(BlockJobTxn *txn) | |
630 | { | |
631 | if (txn && --txn->refcnt == 0) { | |
632 | g_free(txn); | |
633 | } | |
634 | } | |
635 | ||
636 | void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job) | |
637 | { | |
638 | if (!txn) { | |
639 | return; | |
640 | } | |
641 | ||
642 | assert(!job->txn); | |
643 | job->txn = txn; | |
644 | ||
645 | QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); | |
646 | block_job_txn_ref(txn); | |
647 | } |