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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] = { | |
3925cd3b JS |
47 | /* U, C, R, P, Y, S, X, E, N */ |
48 | /* U: */ [BLOCK_JOB_STATUS_UNDEFINED] = {0, 1, 0, 0, 0, 0, 0, 0, 0}, | |
49 | /* C: */ [BLOCK_JOB_STATUS_CREATED] = {0, 0, 1, 0, 0, 0, 1, 0, 1}, | |
50 | /* R: */ [BLOCK_JOB_STATUS_RUNNING] = {0, 0, 0, 1, 1, 0, 1, 1, 0}, | |
51 | /* P: */ [BLOCK_JOB_STATUS_PAUSED] = {0, 0, 1, 0, 0, 0, 0, 0, 0}, | |
52 | /* Y: */ [BLOCK_JOB_STATUS_READY] = {0, 0, 0, 0, 0, 1, 1, 1, 0}, | |
53 | /* S: */ [BLOCK_JOB_STATUS_STANDBY] = {0, 0, 0, 0, 1, 0, 0, 0, 0}, | |
54 | /* X: */ [BLOCK_JOB_STATUS_ABORTING] = {0, 0, 0, 0, 0, 0, 0, 1, 0}, | |
55 | /* E: */ [BLOCK_JOB_STATUS_CONCLUDED] = {0, 0, 0, 0, 0, 0, 0, 0, 1}, | |
56 | /* N: */ [BLOCK_JOB_STATUS_NULL] = {0, 0, 0, 0, 0, 0, 0, 0, 0}, | |
c9de4050 JS |
57 | }; |
58 | ||
0ec4dfb8 | 59 | bool BlockJobVerbTable[BLOCK_JOB_VERB__MAX][BLOCK_JOB_STATUS__MAX] = { |
3925cd3b JS |
60 | /* U, C, R, P, Y, S, X, E, N */ |
61 | [BLOCK_JOB_VERB_CANCEL] = {0, 1, 1, 1, 1, 1, 0, 0, 0}, | |
62 | [BLOCK_JOB_VERB_PAUSE] = {0, 1, 1, 1, 1, 1, 0, 0, 0}, | |
63 | [BLOCK_JOB_VERB_RESUME] = {0, 1, 1, 1, 1, 1, 0, 0, 0}, | |
64 | [BLOCK_JOB_VERB_SET_SPEED] = {0, 1, 1, 1, 1, 1, 0, 0, 0}, | |
65 | [BLOCK_JOB_VERB_COMPLETE] = {0, 0, 0, 0, 1, 0, 0, 0, 0}, | |
0ec4dfb8 JS |
66 | }; |
67 | ||
c9de4050 JS |
68 | static void block_job_state_transition(BlockJob *job, BlockJobStatus s1) |
69 | { | |
70 | BlockJobStatus s0 = job->status; | |
71 | assert(s1 >= 0 && s1 <= BLOCK_JOB_STATUS__MAX); | |
72 | trace_block_job_state_transition(job, job->ret, BlockJobSTT[s0][s1] ? | |
73 | "allowed" : "disallowed", | |
74 | qapi_enum_lookup(&BlockJobStatus_lookup, | |
75 | s0), | |
76 | qapi_enum_lookup(&BlockJobStatus_lookup, | |
77 | s1)); | |
78 | assert(BlockJobSTT[s0][s1]); | |
79 | job->status = s1; | |
80 | } | |
81 | ||
0ec4dfb8 JS |
82 | static int block_job_apply_verb(BlockJob *job, BlockJobVerb bv, Error **errp) |
83 | { | |
84 | assert(bv >= 0 && bv <= BLOCK_JOB_VERB__MAX); | |
85 | trace_block_job_apply_verb(job, qapi_enum_lookup(&BlockJobStatus_lookup, | |
86 | job->status), | |
87 | qapi_enum_lookup(&BlockJobVerb_lookup, bv), | |
88 | BlockJobVerbTable[bv][job->status] ? | |
89 | "allowed" : "prohibited"); | |
90 | if (BlockJobVerbTable[bv][job->status]) { | |
91 | return 0; | |
92 | } | |
93 | error_setg(errp, "Job '%s' in state '%s' cannot accept command verb '%s'", | |
94 | job->id, qapi_enum_lookup(&BlockJobStatus_lookup, job->status), | |
95 | qapi_enum_lookup(&BlockJobVerb_lookup, bv)); | |
96 | return -EPERM; | |
97 | } | |
98 | ||
fc24908e PB |
99 | static void block_job_lock(void) |
100 | { | |
101 | qemu_mutex_lock(&block_job_mutex); | |
102 | } | |
103 | ||
104 | static void block_job_unlock(void) | |
105 | { | |
106 | qemu_mutex_unlock(&block_job_mutex); | |
107 | } | |
108 | ||
109 | static void __attribute__((__constructor__)) block_job_init(void) | |
110 | { | |
111 | qemu_mutex_init(&block_job_mutex); | |
112 | } | |
113 | ||
8254b6d9 JS |
114 | static void block_job_event_cancelled(BlockJob *job); |
115 | static void block_job_event_completed(BlockJob *job, const char *msg); | |
aa9ef2e6 | 116 | static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job)); |
8254b6d9 | 117 | |
c55a832f FZ |
118 | /* Transactional group of block jobs */ |
119 | struct BlockJobTxn { | |
120 | ||
121 | /* Is this txn being cancelled? */ | |
122 | bool aborting; | |
123 | ||
124 | /* List of jobs */ | |
125 | QLIST_HEAD(, BlockJob) jobs; | |
126 | ||
127 | /* Reference count */ | |
128 | int refcnt; | |
129 | }; | |
130 | ||
a7112795 AG |
131 | static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs); |
132 | ||
88691b37 PB |
133 | /* |
134 | * The block job API is composed of two categories of functions. | |
135 | * | |
136 | * The first includes functions used by the monitor. The monitor is | |
137 | * peculiar in that it accesses the block job list with block_job_get, and | |
138 | * therefore needs consistency across block_job_get and the actual operation | |
139 | * (e.g. block_job_set_speed). The consistency is achieved with | |
140 | * aio_context_acquire/release. These functions are declared in blockjob.h. | |
141 | * | |
142 | * The second includes functions used by the block job drivers and sometimes | |
143 | * by the core block layer. These do not care about locking, because the | |
144 | * whole coroutine runs under the AioContext lock, and are declared in | |
145 | * blockjob_int.h. | |
146 | */ | |
147 | ||
a7112795 AG |
148 | BlockJob *block_job_next(BlockJob *job) |
149 | { | |
150 | if (!job) { | |
151 | return QLIST_FIRST(&block_jobs); | |
152 | } | |
153 | return QLIST_NEXT(job, job_list); | |
154 | } | |
155 | ||
ffb1f10c AG |
156 | BlockJob *block_job_get(const char *id) |
157 | { | |
158 | BlockJob *job; | |
159 | ||
160 | QLIST_FOREACH(job, &block_jobs, job_list) { | |
559b935f | 161 | if (job->id && !strcmp(id, job->id)) { |
ffb1f10c AG |
162 | return job; |
163 | } | |
164 | } | |
165 | ||
166 | return NULL; | |
167 | } | |
168 | ||
c8ab5c2d PB |
169 | BlockJobTxn *block_job_txn_new(void) |
170 | { | |
171 | BlockJobTxn *txn = g_new0(BlockJobTxn, 1); | |
172 | QLIST_INIT(&txn->jobs); | |
173 | txn->refcnt = 1; | |
174 | return txn; | |
175 | } | |
176 | ||
177 | static void block_job_txn_ref(BlockJobTxn *txn) | |
178 | { | |
179 | txn->refcnt++; | |
180 | } | |
181 | ||
182 | void block_job_txn_unref(BlockJobTxn *txn) | |
183 | { | |
184 | if (txn && --txn->refcnt == 0) { | |
185 | g_free(txn); | |
186 | } | |
187 | } | |
188 | ||
189 | void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job) | |
190 | { | |
191 | if (!txn) { | |
192 | return; | |
193 | } | |
194 | ||
195 | assert(!job->txn); | |
196 | job->txn = txn; | |
197 | ||
198 | QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); | |
199 | block_job_txn_ref(txn); | |
200 | } | |
201 | ||
f321dcb5 PB |
202 | static void block_job_pause(BlockJob *job) |
203 | { | |
204 | job->pause_count++; | |
205 | } | |
206 | ||
207 | static void block_job_resume(BlockJob *job) | |
208 | { | |
209 | assert(job->pause_count > 0); | |
210 | job->pause_count--; | |
211 | if (job->pause_count) { | |
212 | return; | |
213 | } | |
214 | block_job_enter(job); | |
215 | } | |
216 | ||
4172a003 | 217 | void block_job_ref(BlockJob *job) |
05b0d8e3 PB |
218 | { |
219 | ++job->refcnt; | |
220 | } | |
221 | ||
222 | static void block_job_attached_aio_context(AioContext *new_context, | |
223 | void *opaque); | |
224 | static void block_job_detach_aio_context(void *opaque); | |
225 | ||
4172a003 | 226 | void block_job_unref(BlockJob *job) |
05b0d8e3 PB |
227 | { |
228 | if (--job->refcnt == 0) { | |
3925cd3b | 229 | assert(job->status == BLOCK_JOB_STATUS_NULL); |
05b0d8e3 | 230 | BlockDriverState *bs = blk_bs(job->blk); |
0a3e155f | 231 | QLIST_REMOVE(job, job_list); |
05b0d8e3 PB |
232 | bs->job = NULL; |
233 | block_job_remove_all_bdrv(job); | |
234 | blk_remove_aio_context_notifier(job->blk, | |
235 | block_job_attached_aio_context, | |
236 | block_job_detach_aio_context, job); | |
237 | blk_unref(job->blk); | |
238 | error_free(job->blocker); | |
239 | g_free(job->id); | |
fc24908e | 240 | assert(!timer_pending(&job->sleep_timer)); |
05b0d8e3 PB |
241 | g_free(job); |
242 | } | |
243 | } | |
244 | ||
463e0be1 SH |
245 | static void block_job_attached_aio_context(AioContext *new_context, |
246 | void *opaque) | |
247 | { | |
248 | BlockJob *job = opaque; | |
249 | ||
250 | if (job->driver->attached_aio_context) { | |
251 | job->driver->attached_aio_context(job, new_context); | |
252 | } | |
253 | ||
254 | block_job_resume(job); | |
255 | } | |
256 | ||
bae8196d PB |
257 | static void block_job_drain(BlockJob *job) |
258 | { | |
259 | /* If job is !job->busy this kicks it into the next pause point. */ | |
260 | block_job_enter(job); | |
261 | ||
262 | blk_drain(job->blk); | |
263 | if (job->driver->drain) { | |
264 | job->driver->drain(job); | |
265 | } | |
266 | } | |
267 | ||
463e0be1 SH |
268 | static void block_job_detach_aio_context(void *opaque) |
269 | { | |
270 | BlockJob *job = opaque; | |
271 | ||
272 | /* In case the job terminates during aio_poll()... */ | |
273 | block_job_ref(job); | |
274 | ||
275 | block_job_pause(job); | |
276 | ||
463e0be1 | 277 | while (!job->paused && !job->completed) { |
bae8196d | 278 | block_job_drain(job); |
463e0be1 SH |
279 | } |
280 | ||
281 | block_job_unref(job); | |
282 | } | |
283 | ||
f321dcb5 PB |
284 | static char *child_job_get_parent_desc(BdrvChild *c) |
285 | { | |
286 | BlockJob *job = c->opaque; | |
287 | return g_strdup_printf("%s job '%s'", | |
977c736f | 288 | BlockJobType_str(job->driver->job_type), |
f321dcb5 PB |
289 | job->id); |
290 | } | |
291 | ||
ad90feba | 292 | static void child_job_drained_begin(BdrvChild *c) |
f321dcb5 | 293 | { |
ad90feba | 294 | BlockJob *job = c->opaque; |
f321dcb5 PB |
295 | block_job_pause(job); |
296 | } | |
297 | ||
ad90feba | 298 | static void child_job_drained_end(BdrvChild *c) |
f321dcb5 | 299 | { |
ad90feba | 300 | BlockJob *job = c->opaque; |
f321dcb5 PB |
301 | block_job_resume(job); |
302 | } | |
303 | ||
ad90feba KW |
304 | static const BdrvChildRole child_job = { |
305 | .get_parent_desc = child_job_get_parent_desc, | |
306 | .drained_begin = child_job_drained_begin, | |
307 | .drained_end = child_job_drained_end, | |
308 | .stay_at_node = true, | |
f321dcb5 PB |
309 | }; |
310 | ||
bbc02b90 KW |
311 | void block_job_remove_all_bdrv(BlockJob *job) |
312 | { | |
313 | GSList *l; | |
314 | for (l = job->nodes; l; l = l->next) { | |
315 | BdrvChild *c = l->data; | |
316 | bdrv_op_unblock_all(c->bs, job->blocker); | |
317 | bdrv_root_unref_child(c); | |
318 | } | |
319 | g_slist_free(job->nodes); | |
320 | job->nodes = NULL; | |
321 | } | |
322 | ||
76d554e2 KW |
323 | int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs, |
324 | uint64_t perm, uint64_t shared_perm, Error **errp) | |
23d402d4 | 325 | { |
76d554e2 KW |
326 | BdrvChild *c; |
327 | ||
328 | c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm, | |
329 | job, errp); | |
330 | if (c == NULL) { | |
331 | return -EPERM; | |
332 | } | |
333 | ||
334 | job->nodes = g_slist_prepend(job->nodes, c); | |
23d402d4 AG |
335 | bdrv_ref(bs); |
336 | bdrv_op_block_all(bs, job->blocker); | |
76d554e2 KW |
337 | |
338 | return 0; | |
23d402d4 AG |
339 | } |
340 | ||
559b935f JS |
341 | bool block_job_is_internal(BlockJob *job) |
342 | { | |
343 | return (job->id == NULL); | |
344 | } | |
345 | ||
5ccac6f1 JS |
346 | static bool block_job_started(BlockJob *job) |
347 | { | |
348 | return job->co; | |
349 | } | |
350 | ||
e3796a24 JS |
351 | /** |
352 | * All jobs must allow a pause point before entering their job proper. This | |
353 | * ensures that jobs can be paused prior to being started, then resumed later. | |
354 | */ | |
355 | static void coroutine_fn block_job_co_entry(void *opaque) | |
356 | { | |
357 | BlockJob *job = opaque; | |
358 | ||
359 | assert(job && job->driver && job->driver->start); | |
360 | block_job_pause_point(job); | |
361 | job->driver->start(job); | |
362 | } | |
363 | ||
fc24908e PB |
364 | static void block_job_sleep_timer_cb(void *opaque) |
365 | { | |
366 | BlockJob *job = opaque; | |
367 | ||
368 | block_job_enter(job); | |
369 | } | |
370 | ||
5ccac6f1 JS |
371 | void block_job_start(BlockJob *job) |
372 | { | |
373 | assert(job && !block_job_started(job) && job->paused && | |
e3796a24 JS |
374 | job->driver && job->driver->start); |
375 | job->co = qemu_coroutine_create(block_job_co_entry, job); | |
376 | job->pause_count--; | |
377 | job->busy = true; | |
378 | job->paused = false; | |
c9de4050 | 379 | block_job_state_transition(job, BLOCK_JOB_STATUS_RUNNING); |
aef4278c | 380 | bdrv_coroutine_enter(blk_bs(job->blk), job->co); |
5ccac6f1 JS |
381 | } |
382 | ||
3925cd3b JS |
383 | static void block_job_decommission(BlockJob *job) |
384 | { | |
385 | assert(job); | |
386 | job->completed = true; | |
387 | job->busy = false; | |
388 | job->paused = false; | |
389 | job->deferred_to_main_loop = true; | |
390 | block_job_state_transition(job, BLOCK_JOB_STATUS_NULL); | |
391 | block_job_unref(job); | |
392 | } | |
393 | ||
e0cf0364 JS |
394 | static void block_job_conclude(BlockJob *job) |
395 | { | |
396 | block_job_state_transition(job, BLOCK_JOB_STATUS_CONCLUDED); | |
397 | } | |
398 | ||
c55a832f FZ |
399 | static void block_job_completed_single(BlockJob *job) |
400 | { | |
4fb588e9 PB |
401 | assert(job->completed); |
402 | ||
10a3fbb0 JS |
403 | if (job->ret || block_job_is_cancelled(job)) { |
404 | block_job_state_transition(job, BLOCK_JOB_STATUS_ABORTING); | |
405 | } | |
406 | ||
c55a832f FZ |
407 | if (!job->ret) { |
408 | if (job->driver->commit) { | |
409 | job->driver->commit(job); | |
410 | } | |
411 | } else { | |
412 | if (job->driver->abort) { | |
413 | job->driver->abort(job); | |
414 | } | |
415 | } | |
e8a40bf7 JS |
416 | if (job->driver->clean) { |
417 | job->driver->clean(job); | |
418 | } | |
8254b6d9 JS |
419 | |
420 | if (job->cb) { | |
421 | job->cb(job->opaque, job->ret); | |
422 | } | |
5ccac6f1 JS |
423 | |
424 | /* Emit events only if we actually started */ | |
425 | if (block_job_started(job)) { | |
426 | if (block_job_is_cancelled(job)) { | |
427 | block_job_event_cancelled(job); | |
428 | } else { | |
429 | const char *msg = NULL; | |
430 | if (job->ret < 0) { | |
431 | msg = strerror(-job->ret); | |
432 | } | |
433 | block_job_event_completed(job, msg); | |
8254b6d9 | 434 | } |
8254b6d9 JS |
435 | } |
436 | ||
75859b94 JS |
437 | QLIST_REMOVE(job, txn_list); |
438 | block_job_txn_unref(job->txn); | |
e0cf0364 | 439 | block_job_conclude(job); |
3925cd3b | 440 | block_job_decommission(job); |
c55a832f FZ |
441 | } |
442 | ||
4c241cf5 PB |
443 | static void block_job_cancel_async(BlockJob *job) |
444 | { | |
445 | if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) { | |
446 | block_job_iostatus_reset(job); | |
447 | } | |
448 | if (job->user_paused) { | |
449 | /* Do not call block_job_enter here, the caller will handle it. */ | |
450 | job->user_paused = false; | |
451 | job->pause_count--; | |
452 | } | |
453 | job->cancelled = true; | |
454 | } | |
455 | ||
c8ab5c2d PB |
456 | static int block_job_finish_sync(BlockJob *job, |
457 | void (*finish)(BlockJob *, Error **errp), | |
458 | Error **errp) | |
459 | { | |
460 | Error *local_err = NULL; | |
461 | int ret; | |
462 | ||
463 | assert(blk_bs(job->blk)->job == job); | |
464 | ||
465 | block_job_ref(job); | |
466 | ||
4fb588e9 PB |
467 | if (finish) { |
468 | finish(job, &local_err); | |
469 | } | |
c8ab5c2d PB |
470 | if (local_err) { |
471 | error_propagate(errp, local_err); | |
472 | block_job_unref(job); | |
473 | return -EBUSY; | |
474 | } | |
475 | /* block_job_drain calls block_job_enter, and it should be enough to | |
476 | * induce progress until the job completes or moves to the main thread. | |
477 | */ | |
478 | while (!job->deferred_to_main_loop && !job->completed) { | |
479 | block_job_drain(job); | |
480 | } | |
481 | while (!job->completed) { | |
482 | aio_poll(qemu_get_aio_context(), true); | |
483 | } | |
484 | ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret; | |
485 | block_job_unref(job); | |
486 | return ret; | |
487 | } | |
488 | ||
c55a832f FZ |
489 | static void block_job_completed_txn_abort(BlockJob *job) |
490 | { | |
491 | AioContext *ctx; | |
492 | BlockJobTxn *txn = job->txn; | |
4fb588e9 | 493 | BlockJob *other_job; |
c55a832f FZ |
494 | |
495 | if (txn->aborting) { | |
496 | /* | |
497 | * We are cancelled by another job, which will handle everything. | |
498 | */ | |
499 | return; | |
500 | } | |
501 | txn->aborting = true; | |
4fb588e9 PB |
502 | block_job_txn_ref(txn); |
503 | ||
c55a832f FZ |
504 | /* We are the first failed job. Cancel other jobs. */ |
505 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
b6d2e599 | 506 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
507 | aio_context_acquire(ctx); |
508 | } | |
4fb588e9 PB |
509 | |
510 | /* Other jobs are effectively cancelled by us, set the status for | |
511 | * them; this job, however, may or may not be cancelled, depending | |
512 | * on the caller, so leave it. */ | |
c55a832f | 513 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { |
4fb588e9 PB |
514 | if (other_job != job) { |
515 | block_job_cancel_async(other_job); | |
c55a832f | 516 | } |
c55a832f | 517 | } |
4fb588e9 PB |
518 | while (!QLIST_EMPTY(&txn->jobs)) { |
519 | other_job = QLIST_FIRST(&txn->jobs); | |
b6d2e599 | 520 | ctx = blk_get_aio_context(other_job->blk); |
4fb588e9 PB |
521 | if (!other_job->completed) { |
522 | assert(other_job->cancelled); | |
523 | block_job_finish_sync(other_job, NULL, NULL); | |
524 | } | |
c55a832f FZ |
525 | block_job_completed_single(other_job); |
526 | aio_context_release(ctx); | |
527 | } | |
4fb588e9 PB |
528 | |
529 | block_job_txn_unref(txn); | |
c55a832f FZ |
530 | } |
531 | ||
532 | static void block_job_completed_txn_success(BlockJob *job) | |
533 | { | |
534 | AioContext *ctx; | |
535 | BlockJobTxn *txn = job->txn; | |
536 | BlockJob *other_job, *next; | |
537 | /* | |
538 | * Successful completion, see if there are other running jobs in this | |
539 | * txn. | |
540 | */ | |
541 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
542 | if (!other_job->completed) { | |
543 | return; | |
544 | } | |
545 | } | |
546 | /* We are the last completed job, commit the transaction. */ | |
547 | QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { | |
b6d2e599 | 548 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
549 | aio_context_acquire(ctx); |
550 | assert(other_job->ret == 0); | |
551 | block_job_completed_single(other_job); | |
552 | aio_context_release(ctx); | |
553 | } | |
554 | } | |
555 | ||
aa9ef2e6 JS |
556 | /* Assumes the block_job_mutex is held */ |
557 | static bool block_job_timer_pending(BlockJob *job) | |
558 | { | |
559 | return timer_pending(&job->sleep_timer); | |
560 | } | |
561 | ||
2f0c9fe6 PB |
562 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
563 | { | |
564 | Error *local_err = NULL; | |
aa9ef2e6 | 565 | int64_t old_speed = job->speed; |
2f0c9fe6 | 566 | |
3fc4b10a | 567 | if (!job->driver->set_speed) { |
c6bd8c70 | 568 | error_setg(errp, QERR_UNSUPPORTED); |
2f0c9fe6 PB |
569 | return; |
570 | } | |
0ec4dfb8 JS |
571 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_SET_SPEED, errp)) { |
572 | return; | |
573 | } | |
3fc4b10a | 574 | job->driver->set_speed(job, speed, &local_err); |
84d18f06 | 575 | if (local_err) { |
2f0c9fe6 PB |
576 | error_propagate(errp, local_err); |
577 | return; | |
578 | } | |
579 | ||
580 | job->speed = speed; | |
d4fce188 | 581 | if (speed && speed <= old_speed) { |
aa9ef2e6 JS |
582 | return; |
583 | } | |
584 | ||
585 | /* kick only if a timer is pending */ | |
586 | block_job_enter_cond(job, block_job_timer_pending); | |
2f0c9fe6 PB |
587 | } |
588 | ||
aeae883b PB |
589 | void block_job_complete(BlockJob *job, Error **errp) |
590 | { | |
559b935f JS |
591 | /* Should not be reachable via external interface for internal jobs */ |
592 | assert(job->id); | |
0ec4dfb8 JS |
593 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_COMPLETE, errp)) { |
594 | return; | |
595 | } | |
596 | if (job->pause_count || job->cancelled || !job->driver->complete) { | |
9df229c3 AG |
597 | error_setg(errp, "The active block job '%s' cannot be completed", |
598 | job->id); | |
aeae883b PB |
599 | return; |
600 | } | |
601 | ||
3fc4b10a | 602 | job->driver->complete(job, errp); |
aeae883b PB |
603 | } |
604 | ||
0ec4dfb8 | 605 | void block_job_user_pause(BlockJob *job, Error **errp) |
0df4ba58 | 606 | { |
0ec4dfb8 JS |
607 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_PAUSE, errp)) { |
608 | return; | |
609 | } | |
610 | if (job->user_paused) { | |
611 | error_setg(errp, "Job is already paused"); | |
612 | return; | |
613 | } | |
0df4ba58 JS |
614 | job->user_paused = true; |
615 | block_job_pause(job); | |
616 | } | |
617 | ||
0df4ba58 JS |
618 | bool block_job_user_paused(BlockJob *job) |
619 | { | |
6573d9c6 | 620 | return job->user_paused; |
0df4ba58 JS |
621 | } |
622 | ||
0ec4dfb8 | 623 | void block_job_user_resume(BlockJob *job, Error **errp) |
0df4ba58 | 624 | { |
0ec4dfb8 JS |
625 | assert(job); |
626 | if (!job->user_paused || job->pause_count <= 0) { | |
627 | error_setg(errp, "Can't resume a job that was not paused"); | |
628 | return; | |
0df4ba58 | 629 | } |
0ec4dfb8 JS |
630 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_RESUME, errp)) { |
631 | return; | |
632 | } | |
633 | block_job_iostatus_reset(job); | |
634 | job->user_paused = false; | |
635 | block_job_resume(job); | |
0df4ba58 JS |
636 | } |
637 | ||
8acc72a4 PB |
638 | void block_job_cancel(BlockJob *job) |
639 | { | |
e0cf0364 JS |
640 | if (job->status == BLOCK_JOB_STATUS_CONCLUDED) { |
641 | return; | |
642 | } else if (block_job_started(job)) { | |
4c241cf5 | 643 | block_job_cancel_async(job); |
5ccac6f1 JS |
644 | block_job_enter(job); |
645 | } else { | |
646 | block_job_completed(job, -ECANCELED); | |
647 | } | |
8acc72a4 PB |
648 | } |
649 | ||
0ec4dfb8 JS |
650 | void block_job_user_cancel(BlockJob *job, Error **errp) |
651 | { | |
652 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_CANCEL, errp)) { | |
653 | return; | |
654 | } | |
655 | block_job_cancel(job); | |
656 | } | |
657 | ||
345f9e1b HR |
658 | /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be |
659 | * used with block_job_finish_sync() without the need for (rather nasty) | |
660 | * function pointer casts there. */ | |
661 | static void block_job_cancel_err(BlockJob *job, Error **errp) | |
662 | { | |
663 | block_job_cancel(job); | |
664 | } | |
665 | ||
666 | int block_job_cancel_sync(BlockJob *job) | |
667 | { | |
668 | return block_job_finish_sync(job, &block_job_cancel_err, NULL); | |
669 | } | |
670 | ||
a1a2af07 KW |
671 | void block_job_cancel_sync_all(void) |
672 | { | |
673 | BlockJob *job; | |
674 | AioContext *aio_context; | |
675 | ||
676 | while ((job = QLIST_FIRST(&block_jobs))) { | |
b6d2e599 | 677 | aio_context = blk_get_aio_context(job->blk); |
a1a2af07 KW |
678 | aio_context_acquire(aio_context); |
679 | block_job_cancel_sync(job); | |
680 | aio_context_release(aio_context); | |
681 | } | |
682 | } | |
683 | ||
345f9e1b HR |
684 | int block_job_complete_sync(BlockJob *job, Error **errp) |
685 | { | |
686 | return block_job_finish_sync(job, &block_job_complete, errp); | |
687 | } | |
688 | ||
559b935f | 689 | BlockJobInfo *block_job_query(BlockJob *job, Error **errp) |
30e628b7 | 690 | { |
559b935f JS |
691 | BlockJobInfo *info; |
692 | ||
693 | if (block_job_is_internal(job)) { | |
694 | error_setg(errp, "Cannot query QEMU internal jobs"); | |
695 | return NULL; | |
696 | } | |
697 | info = g_new0(BlockJobInfo, 1); | |
977c736f | 698 | info->type = g_strdup(BlockJobType_str(job->driver->job_type)); |
8ccb9569 | 699 | info->device = g_strdup(job->id); |
32c81a4a | 700 | info->len = job->len; |
fc24908e | 701 | info->busy = atomic_read(&job->busy); |
751ebd76 | 702 | info->paused = job->pause_count > 0; |
32c81a4a PB |
703 | info->offset = job->offset; |
704 | info->speed = job->speed; | |
705 | info->io_status = job->iostatus; | |
ef6dbf1e | 706 | info->ready = job->ready; |
58b295ba | 707 | info->status = job->status; |
30e628b7 PB |
708 | return info; |
709 | } | |
32c81a4a PB |
710 | |
711 | static void block_job_iostatus_set_err(BlockJob *job, int error) | |
712 | { | |
713 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
714 | job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
715 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
716 | } | |
717 | } | |
718 | ||
8254b6d9 | 719 | static void block_job_event_cancelled(BlockJob *job) |
bcada37b | 720 | { |
559b935f JS |
721 | if (block_job_is_internal(job)) { |
722 | return; | |
723 | } | |
724 | ||
bcada37b | 725 | qapi_event_send_block_job_cancelled(job->driver->job_type, |
8ccb9569 | 726 | job->id, |
bcada37b WX |
727 | job->len, |
728 | job->offset, | |
729 | job->speed, | |
730 | &error_abort); | |
731 | } | |
32c81a4a | 732 | |
8254b6d9 | 733 | static void block_job_event_completed(BlockJob *job, const char *msg) |
a66a2a36 | 734 | { |
559b935f JS |
735 | if (block_job_is_internal(job)) { |
736 | return; | |
737 | } | |
738 | ||
bcada37b | 739 | qapi_event_send_block_job_completed(job->driver->job_type, |
8ccb9569 | 740 | job->id, |
bcada37b WX |
741 | job->len, |
742 | job->offset, | |
743 | job->speed, | |
744 | !!msg, | |
745 | msg, | |
746 | &error_abort); | |
a66a2a36 PB |
747 | } |
748 | ||
88691b37 PB |
749 | /* |
750 | * API for block job drivers and the block layer. These functions are | |
751 | * declared in blockjob_int.h. | |
752 | */ | |
753 | ||
754 | void *block_job_create(const char *job_id, const BlockJobDriver *driver, | |
75859b94 | 755 | BlockJobTxn *txn, BlockDriverState *bs, uint64_t perm, |
88691b37 PB |
756 | uint64_t shared_perm, int64_t speed, int flags, |
757 | BlockCompletionFunc *cb, void *opaque, Error **errp) | |
758 | { | |
759 | BlockBackend *blk; | |
760 | BlockJob *job; | |
761 | int ret; | |
762 | ||
763 | if (bs->job) { | |
764 | error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); | |
765 | return NULL; | |
766 | } | |
767 | ||
768 | if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) { | |
769 | job_id = bdrv_get_device_name(bs); | |
770 | if (!*job_id) { | |
771 | error_setg(errp, "An explicit job ID is required for this node"); | |
772 | return NULL; | |
773 | } | |
774 | } | |
775 | ||
776 | if (job_id) { | |
777 | if (flags & BLOCK_JOB_INTERNAL) { | |
778 | error_setg(errp, "Cannot specify job ID for internal block job"); | |
779 | return NULL; | |
780 | } | |
781 | ||
782 | if (!id_wellformed(job_id)) { | |
783 | error_setg(errp, "Invalid job ID '%s'", job_id); | |
784 | return NULL; | |
785 | } | |
786 | ||
787 | if (block_job_get(job_id)) { | |
788 | error_setg(errp, "Job ID '%s' already in use", job_id); | |
789 | return NULL; | |
790 | } | |
791 | } | |
792 | ||
793 | blk = blk_new(perm, shared_perm); | |
794 | ret = blk_insert_bs(blk, bs, errp); | |
795 | if (ret < 0) { | |
796 | blk_unref(blk); | |
797 | return NULL; | |
798 | } | |
799 | ||
800 | job = g_malloc0(driver->instance_size); | |
801 | job->driver = driver; | |
802 | job->id = g_strdup(job_id); | |
803 | job->blk = blk; | |
804 | job->cb = cb; | |
805 | job->opaque = opaque; | |
806 | job->busy = false; | |
807 | job->paused = true; | |
808 | job->pause_count = 1; | |
809 | job->refcnt = 1; | |
c9de4050 | 810 | block_job_state_transition(job, BLOCK_JOB_STATUS_CREATED); |
fc24908e PB |
811 | aio_timer_init(qemu_get_aio_context(), &job->sleep_timer, |
812 | QEMU_CLOCK_REALTIME, SCALE_NS, | |
813 | block_job_sleep_timer_cb, job); | |
88691b37 PB |
814 | |
815 | error_setg(&job->blocker, "block device is in use by block job: %s", | |
977c736f | 816 | BlockJobType_str(driver->job_type)); |
88691b37 PB |
817 | block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort); |
818 | bs->job = job; | |
819 | ||
88691b37 PB |
820 | bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); |
821 | ||
822 | QLIST_INSERT_HEAD(&block_jobs, job, job_list); | |
823 | ||
824 | blk_add_aio_context_notifier(blk, block_job_attached_aio_context, | |
825 | block_job_detach_aio_context, job); | |
826 | ||
827 | /* Only set speed when necessary to avoid NotSupported error */ | |
828 | if (speed != 0) { | |
829 | Error *local_err = NULL; | |
830 | ||
831 | block_job_set_speed(job, speed, &local_err); | |
832 | if (local_err) { | |
3925cd3b | 833 | block_job_early_fail(job); |
88691b37 PB |
834 | error_propagate(errp, local_err); |
835 | return NULL; | |
836 | } | |
837 | } | |
75859b94 JS |
838 | |
839 | /* Single jobs are modeled as single-job transactions for sake of | |
840 | * consolidating the job management logic */ | |
841 | if (!txn) { | |
842 | txn = block_job_txn_new(); | |
843 | block_job_txn_add_job(txn, job); | |
844 | block_job_txn_unref(txn); | |
845 | } else { | |
846 | block_job_txn_add_job(txn, job); | |
847 | } | |
848 | ||
88691b37 PB |
849 | return job; |
850 | } | |
851 | ||
f321dcb5 PB |
852 | void block_job_pause_all(void) |
853 | { | |
854 | BlockJob *job = NULL; | |
855 | while ((job = block_job_next(job))) { | |
856 | AioContext *aio_context = blk_get_aio_context(job->blk); | |
857 | ||
858 | aio_context_acquire(aio_context); | |
3d5d319e | 859 | block_job_ref(job); |
f321dcb5 PB |
860 | block_job_pause(job); |
861 | aio_context_release(aio_context); | |
862 | } | |
863 | } | |
864 | ||
88691b37 PB |
865 | void block_job_early_fail(BlockJob *job) |
866 | { | |
3925cd3b JS |
867 | assert(job->status == BLOCK_JOB_STATUS_CREATED); |
868 | block_job_decommission(job); | |
88691b37 PB |
869 | } |
870 | ||
871 | void block_job_completed(BlockJob *job, int ret) | |
872 | { | |
75859b94 | 873 | assert(job && job->txn && !job->completed); |
88691b37 | 874 | assert(blk_bs(job->blk)->job == job); |
88691b37 PB |
875 | job->completed = true; |
876 | job->ret = ret; | |
75859b94 | 877 | if (ret < 0 || block_job_is_cancelled(job)) { |
88691b37 PB |
878 | block_job_completed_txn_abort(job); |
879 | } else { | |
880 | block_job_completed_txn_success(job); | |
881 | } | |
882 | } | |
883 | ||
884 | static bool block_job_should_pause(BlockJob *job) | |
885 | { | |
886 | return job->pause_count > 0; | |
887 | } | |
888 | ||
fc24908e PB |
889 | /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds. |
890 | * Reentering the job coroutine with block_job_enter() before the timer has | |
891 | * expired is allowed and cancels the timer. | |
892 | * | |
893 | * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be | |
894 | * called explicitly. */ | |
895 | static void block_job_do_yield(BlockJob *job, uint64_t ns) | |
356f59b8 | 896 | { |
fc24908e PB |
897 | block_job_lock(); |
898 | if (ns != -1) { | |
899 | timer_mod(&job->sleep_timer, ns); | |
900 | } | |
356f59b8 | 901 | job->busy = false; |
fc24908e | 902 | block_job_unlock(); |
356f59b8 PB |
903 | qemu_coroutine_yield(); |
904 | ||
905 | /* Set by block_job_enter before re-entering the coroutine. */ | |
906 | assert(job->busy); | |
907 | } | |
908 | ||
88691b37 PB |
909 | void coroutine_fn block_job_pause_point(BlockJob *job) |
910 | { | |
911 | assert(job && block_job_started(job)); | |
912 | ||
913 | if (!block_job_should_pause(job)) { | |
914 | return; | |
915 | } | |
916 | if (block_job_is_cancelled(job)) { | |
917 | return; | |
918 | } | |
919 | ||
920 | if (job->driver->pause) { | |
921 | job->driver->pause(job); | |
922 | } | |
923 | ||
924 | if (block_job_should_pause(job) && !block_job_is_cancelled(job)) { | |
58b295ba | 925 | BlockJobStatus status = job->status; |
c9de4050 JS |
926 | block_job_state_transition(job, status == BLOCK_JOB_STATUS_READY ? \ |
927 | BLOCK_JOB_STATUS_STANDBY : \ | |
928 | BLOCK_JOB_STATUS_PAUSED); | |
88691b37 | 929 | job->paused = true; |
fc24908e | 930 | block_job_do_yield(job, -1); |
88691b37 | 931 | job->paused = false; |
c9de4050 | 932 | block_job_state_transition(job, status); |
88691b37 PB |
933 | } |
934 | ||
935 | if (job->driver->resume) { | |
936 | job->driver->resume(job); | |
937 | } | |
938 | } | |
939 | ||
f321dcb5 PB |
940 | void block_job_resume_all(void) |
941 | { | |
3d5d319e AG |
942 | BlockJob *job, *next; |
943 | ||
944 | QLIST_FOREACH_SAFE(job, &block_jobs, job_list, next) { | |
f321dcb5 PB |
945 | AioContext *aio_context = blk_get_aio_context(job->blk); |
946 | ||
947 | aio_context_acquire(aio_context); | |
948 | block_job_resume(job); | |
3d5d319e | 949 | block_job_unref(job); |
f321dcb5 PB |
950 | aio_context_release(aio_context); |
951 | } | |
952 | } | |
953 | ||
aa9ef2e6 JS |
954 | /* |
955 | * Conditionally enter a block_job pending a call to fn() while | |
956 | * under the block_job_lock critical section. | |
957 | */ | |
958 | static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job)) | |
88691b37 | 959 | { |
eb05e011 PB |
960 | if (!block_job_started(job)) { |
961 | return; | |
962 | } | |
963 | if (job->deferred_to_main_loop) { | |
964 | return; | |
965 | } | |
966 | ||
fc24908e | 967 | block_job_lock(); |
356f59b8 | 968 | if (job->busy) { |
fc24908e | 969 | block_job_unlock(); |
356f59b8 | 970 | return; |
88691b37 | 971 | } |
356f59b8 | 972 | |
aa9ef2e6 JS |
973 | if (fn && !fn(job)) { |
974 | block_job_unlock(); | |
975 | return; | |
976 | } | |
977 | ||
fc24908e PB |
978 | assert(!job->deferred_to_main_loop); |
979 | timer_del(&job->sleep_timer); | |
356f59b8 | 980 | job->busy = true; |
fc24908e | 981 | block_job_unlock(); |
356f59b8 | 982 | aio_co_wake(job->co); |
88691b37 PB |
983 | } |
984 | ||
aa9ef2e6 JS |
985 | void block_job_enter(BlockJob *job) |
986 | { | |
987 | block_job_enter_cond(job, NULL); | |
988 | } | |
989 | ||
88691b37 PB |
990 | bool block_job_is_cancelled(BlockJob *job) |
991 | { | |
992 | return job->cancelled; | |
993 | } | |
994 | ||
5bf1d5a7 | 995 | void block_job_sleep_ns(BlockJob *job, int64_t ns) |
88691b37 PB |
996 | { |
997 | assert(job->busy); | |
998 | ||
999 | /* Check cancellation *before* setting busy = false, too! */ | |
1000 | if (block_job_is_cancelled(job)) { | |
1001 | return; | |
1002 | } | |
1003 | ||
88691b37 | 1004 | if (!block_job_should_pause(job)) { |
fc24908e | 1005 | block_job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns); |
88691b37 | 1006 | } |
88691b37 PB |
1007 | |
1008 | block_job_pause_point(job); | |
1009 | } | |
1010 | ||
1011 | void block_job_yield(BlockJob *job) | |
1012 | { | |
1013 | assert(job->busy); | |
1014 | ||
1015 | /* Check cancellation *before* setting busy = false, too! */ | |
1016 | if (block_job_is_cancelled(job)) { | |
1017 | return; | |
1018 | } | |
1019 | ||
88691b37 | 1020 | if (!block_job_should_pause(job)) { |
fc24908e | 1021 | block_job_do_yield(job, -1); |
88691b37 | 1022 | } |
88691b37 PB |
1023 | |
1024 | block_job_pause_point(job); | |
1025 | } | |
1026 | ||
2caf63a9 PB |
1027 | void block_job_iostatus_reset(BlockJob *job) |
1028 | { | |
4c241cf5 PB |
1029 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
1030 | return; | |
1031 | } | |
1032 | assert(job->user_paused && job->pause_count > 0); | |
2caf63a9 PB |
1033 | job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
1034 | } | |
1035 | ||
bcada37b | 1036 | void block_job_event_ready(BlockJob *job) |
a66a2a36 | 1037 | { |
c9de4050 | 1038 | block_job_state_transition(job, BLOCK_JOB_STATUS_READY); |
ef6dbf1e HR |
1039 | job->ready = true; |
1040 | ||
559b935f JS |
1041 | if (block_job_is_internal(job)) { |
1042 | return; | |
1043 | } | |
1044 | ||
518848a2 | 1045 | qapi_event_send_block_job_ready(job->driver->job_type, |
8ccb9569 | 1046 | job->id, |
518848a2 MA |
1047 | job->len, |
1048 | job->offset, | |
1049 | job->speed, &error_abort); | |
a66a2a36 PB |
1050 | } |
1051 | ||
81e254dc | 1052 | BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err, |
32c81a4a PB |
1053 | int is_read, int error) |
1054 | { | |
1055 | BlockErrorAction action; | |
1056 | ||
1057 | switch (on_err) { | |
1058 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
8c398252 | 1059 | case BLOCKDEV_ON_ERROR_AUTO: |
a589569f WX |
1060 | action = (error == ENOSPC) ? |
1061 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
32c81a4a PB |
1062 | break; |
1063 | case BLOCKDEV_ON_ERROR_STOP: | |
a589569f | 1064 | action = BLOCK_ERROR_ACTION_STOP; |
32c81a4a PB |
1065 | break; |
1066 | case BLOCKDEV_ON_ERROR_REPORT: | |
a589569f | 1067 | action = BLOCK_ERROR_ACTION_REPORT; |
32c81a4a PB |
1068 | break; |
1069 | case BLOCKDEV_ON_ERROR_IGNORE: | |
a589569f | 1070 | action = BLOCK_ERROR_ACTION_IGNORE; |
32c81a4a PB |
1071 | break; |
1072 | default: | |
1073 | abort(); | |
1074 | } | |
559b935f JS |
1075 | if (!block_job_is_internal(job)) { |
1076 | qapi_event_send_block_job_error(job->id, | |
1077 | is_read ? IO_OPERATION_TYPE_READ : | |
1078 | IO_OPERATION_TYPE_WRITE, | |
1079 | action, &error_abort); | |
1080 | } | |
a589569f | 1081 | if (action == BLOCK_ERROR_ACTION_STOP) { |
0ec4dfb8 | 1082 | block_job_pause(job); |
751ebd76 | 1083 | /* make the pause user visible, which will be resumed from QMP. */ |
0ec4dfb8 | 1084 | job->user_paused = true; |
32c81a4a | 1085 | block_job_iostatus_set_err(job, error); |
32c81a4a PB |
1086 | } |
1087 | return action; | |
1088 | } | |
dec7d421 SH |
1089 | |
1090 | typedef struct { | |
1091 | BlockJob *job; | |
dec7d421 SH |
1092 | AioContext *aio_context; |
1093 | BlockJobDeferToMainLoopFn *fn; | |
1094 | void *opaque; | |
1095 | } BlockJobDeferToMainLoopData; | |
1096 | ||
1097 | static void block_job_defer_to_main_loop_bh(void *opaque) | |
1098 | { | |
1099 | BlockJobDeferToMainLoopData *data = opaque; | |
1100 | AioContext *aio_context; | |
1101 | ||
dec7d421 SH |
1102 | /* Prevent race with block_job_defer_to_main_loop() */ |
1103 | aio_context_acquire(data->aio_context); | |
1104 | ||
1105 | /* Fetch BDS AioContext again, in case it has changed */ | |
b6d2e599 | 1106 | aio_context = blk_get_aio_context(data->job->blk); |
d79df2a2 PB |
1107 | if (aio_context != data->aio_context) { |
1108 | aio_context_acquire(aio_context); | |
1109 | } | |
dec7d421 SH |
1110 | |
1111 | data->fn(data->job, data->opaque); | |
1112 | ||
d79df2a2 PB |
1113 | if (aio_context != data->aio_context) { |
1114 | aio_context_release(aio_context); | |
1115 | } | |
dec7d421 SH |
1116 | |
1117 | aio_context_release(data->aio_context); | |
1118 | ||
1119 | g_free(data); | |
1120 | } | |
1121 | ||
1122 | void block_job_defer_to_main_loop(BlockJob *job, | |
1123 | BlockJobDeferToMainLoopFn *fn, | |
1124 | void *opaque) | |
1125 | { | |
1126 | BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); | |
1127 | data->job = job; | |
b6d2e599 | 1128 | data->aio_context = blk_get_aio_context(job->blk); |
dec7d421 SH |
1129 | data->fn = fn; |
1130 | data->opaque = opaque; | |
794f0141 | 1131 | job->deferred_to_main_loop = true; |
dec7d421 | 1132 | |
fffb6e12 PB |
1133 | aio_bh_schedule_oneshot(qemu_get_aio_context(), |
1134 | block_job_defer_to_main_loop_bh, data); | |
dec7d421 | 1135 | } |