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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}, | |
75f71059 | 66 | [BLOCK_JOB_VERB_DISMISS] = {0, 0, 0, 0, 0, 0, 0, 1, 0}, |
0ec4dfb8 JS |
67 | }; |
68 | ||
c9de4050 JS |
69 | static void block_job_state_transition(BlockJob *job, BlockJobStatus s1) |
70 | { | |
71 | BlockJobStatus s0 = job->status; | |
72 | assert(s1 >= 0 && s1 <= BLOCK_JOB_STATUS__MAX); | |
73 | trace_block_job_state_transition(job, job->ret, BlockJobSTT[s0][s1] ? | |
74 | "allowed" : "disallowed", | |
75 | qapi_enum_lookup(&BlockJobStatus_lookup, | |
76 | s0), | |
77 | qapi_enum_lookup(&BlockJobStatus_lookup, | |
78 | s1)); | |
79 | assert(BlockJobSTT[s0][s1]); | |
80 | job->status = s1; | |
81 | } | |
82 | ||
0ec4dfb8 JS |
83 | static int block_job_apply_verb(BlockJob *job, BlockJobVerb bv, Error **errp) |
84 | { | |
85 | assert(bv >= 0 && bv <= BLOCK_JOB_VERB__MAX); | |
86 | trace_block_job_apply_verb(job, qapi_enum_lookup(&BlockJobStatus_lookup, | |
87 | job->status), | |
88 | qapi_enum_lookup(&BlockJobVerb_lookup, bv), | |
89 | BlockJobVerbTable[bv][job->status] ? | |
90 | "allowed" : "prohibited"); | |
91 | if (BlockJobVerbTable[bv][job->status]) { | |
92 | return 0; | |
93 | } | |
94 | error_setg(errp, "Job '%s' in state '%s' cannot accept command verb '%s'", | |
95 | job->id, qapi_enum_lookup(&BlockJobStatus_lookup, job->status), | |
96 | qapi_enum_lookup(&BlockJobVerb_lookup, bv)); | |
97 | return -EPERM; | |
98 | } | |
99 | ||
fc24908e PB |
100 | static void block_job_lock(void) |
101 | { | |
102 | qemu_mutex_lock(&block_job_mutex); | |
103 | } | |
104 | ||
105 | static void block_job_unlock(void) | |
106 | { | |
107 | qemu_mutex_unlock(&block_job_mutex); | |
108 | } | |
109 | ||
110 | static void __attribute__((__constructor__)) block_job_init(void) | |
111 | { | |
112 | qemu_mutex_init(&block_job_mutex); | |
113 | } | |
114 | ||
8254b6d9 JS |
115 | static void block_job_event_cancelled(BlockJob *job); |
116 | static void block_job_event_completed(BlockJob *job, const char *msg); | |
aa9ef2e6 | 117 | static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job)); |
8254b6d9 | 118 | |
c55a832f FZ |
119 | /* Transactional group of block jobs */ |
120 | struct BlockJobTxn { | |
121 | ||
122 | /* Is this txn being cancelled? */ | |
123 | bool aborting; | |
124 | ||
125 | /* List of jobs */ | |
126 | QLIST_HEAD(, BlockJob) jobs; | |
127 | ||
128 | /* Reference count */ | |
129 | int refcnt; | |
130 | }; | |
131 | ||
a7112795 AG |
132 | static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs); |
133 | ||
88691b37 PB |
134 | /* |
135 | * The block job API is composed of two categories of functions. | |
136 | * | |
137 | * The first includes functions used by the monitor. The monitor is | |
138 | * peculiar in that it accesses the block job list with block_job_get, and | |
139 | * therefore needs consistency across block_job_get and the actual operation | |
140 | * (e.g. block_job_set_speed). The consistency is achieved with | |
141 | * aio_context_acquire/release. These functions are declared in blockjob.h. | |
142 | * | |
143 | * The second includes functions used by the block job drivers and sometimes | |
144 | * by the core block layer. These do not care about locking, because the | |
145 | * whole coroutine runs under the AioContext lock, and are declared in | |
146 | * blockjob_int.h. | |
147 | */ | |
148 | ||
a7112795 AG |
149 | BlockJob *block_job_next(BlockJob *job) |
150 | { | |
151 | if (!job) { | |
152 | return QLIST_FIRST(&block_jobs); | |
153 | } | |
154 | return QLIST_NEXT(job, job_list); | |
155 | } | |
156 | ||
ffb1f10c AG |
157 | BlockJob *block_job_get(const char *id) |
158 | { | |
159 | BlockJob *job; | |
160 | ||
161 | QLIST_FOREACH(job, &block_jobs, job_list) { | |
559b935f | 162 | if (job->id && !strcmp(id, job->id)) { |
ffb1f10c AG |
163 | return job; |
164 | } | |
165 | } | |
166 | ||
167 | return NULL; | |
168 | } | |
169 | ||
c8ab5c2d PB |
170 | BlockJobTxn *block_job_txn_new(void) |
171 | { | |
172 | BlockJobTxn *txn = g_new0(BlockJobTxn, 1); | |
173 | QLIST_INIT(&txn->jobs); | |
174 | txn->refcnt = 1; | |
175 | return txn; | |
176 | } | |
177 | ||
178 | static void block_job_txn_ref(BlockJobTxn *txn) | |
179 | { | |
180 | txn->refcnt++; | |
181 | } | |
182 | ||
183 | void block_job_txn_unref(BlockJobTxn *txn) | |
184 | { | |
185 | if (txn && --txn->refcnt == 0) { | |
186 | g_free(txn); | |
187 | } | |
188 | } | |
189 | ||
190 | void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job) | |
191 | { | |
192 | if (!txn) { | |
193 | return; | |
194 | } | |
195 | ||
196 | assert(!job->txn); | |
197 | job->txn = txn; | |
198 | ||
199 | QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); | |
200 | block_job_txn_ref(txn); | |
201 | } | |
202 | ||
f321dcb5 PB |
203 | static void block_job_pause(BlockJob *job) |
204 | { | |
205 | job->pause_count++; | |
206 | } | |
207 | ||
208 | static void block_job_resume(BlockJob *job) | |
209 | { | |
210 | assert(job->pause_count > 0); | |
211 | job->pause_count--; | |
212 | if (job->pause_count) { | |
213 | return; | |
214 | } | |
215 | block_job_enter(job); | |
216 | } | |
217 | ||
4172a003 | 218 | void block_job_ref(BlockJob *job) |
05b0d8e3 PB |
219 | { |
220 | ++job->refcnt; | |
221 | } | |
222 | ||
223 | static void block_job_attached_aio_context(AioContext *new_context, | |
224 | void *opaque); | |
225 | static void block_job_detach_aio_context(void *opaque); | |
226 | ||
4172a003 | 227 | void block_job_unref(BlockJob *job) |
05b0d8e3 PB |
228 | { |
229 | if (--job->refcnt == 0) { | |
3925cd3b | 230 | assert(job->status == BLOCK_JOB_STATUS_NULL); |
05b0d8e3 | 231 | BlockDriverState *bs = blk_bs(job->blk); |
0a3e155f | 232 | QLIST_REMOVE(job, job_list); |
05b0d8e3 PB |
233 | bs->job = NULL; |
234 | block_job_remove_all_bdrv(job); | |
235 | blk_remove_aio_context_notifier(job->blk, | |
236 | block_job_attached_aio_context, | |
237 | block_job_detach_aio_context, job); | |
238 | blk_unref(job->blk); | |
239 | error_free(job->blocker); | |
240 | g_free(job->id); | |
fc24908e | 241 | assert(!timer_pending(&job->sleep_timer)); |
05b0d8e3 PB |
242 | g_free(job); |
243 | } | |
244 | } | |
245 | ||
463e0be1 SH |
246 | static void block_job_attached_aio_context(AioContext *new_context, |
247 | void *opaque) | |
248 | { | |
249 | BlockJob *job = opaque; | |
250 | ||
251 | if (job->driver->attached_aio_context) { | |
252 | job->driver->attached_aio_context(job, new_context); | |
253 | } | |
254 | ||
255 | block_job_resume(job); | |
256 | } | |
257 | ||
bae8196d PB |
258 | static void block_job_drain(BlockJob *job) |
259 | { | |
260 | /* If job is !job->busy this kicks it into the next pause point. */ | |
261 | block_job_enter(job); | |
262 | ||
263 | blk_drain(job->blk); | |
264 | if (job->driver->drain) { | |
265 | job->driver->drain(job); | |
266 | } | |
267 | } | |
268 | ||
463e0be1 SH |
269 | static void block_job_detach_aio_context(void *opaque) |
270 | { | |
271 | BlockJob *job = opaque; | |
272 | ||
273 | /* In case the job terminates during aio_poll()... */ | |
274 | block_job_ref(job); | |
275 | ||
276 | block_job_pause(job); | |
277 | ||
463e0be1 | 278 | while (!job->paused && !job->completed) { |
bae8196d | 279 | block_job_drain(job); |
463e0be1 SH |
280 | } |
281 | ||
282 | block_job_unref(job); | |
283 | } | |
284 | ||
f321dcb5 PB |
285 | static char *child_job_get_parent_desc(BdrvChild *c) |
286 | { | |
287 | BlockJob *job = c->opaque; | |
288 | return g_strdup_printf("%s job '%s'", | |
977c736f | 289 | BlockJobType_str(job->driver->job_type), |
f321dcb5 PB |
290 | job->id); |
291 | } | |
292 | ||
ad90feba | 293 | static void child_job_drained_begin(BdrvChild *c) |
f321dcb5 | 294 | { |
ad90feba | 295 | BlockJob *job = c->opaque; |
f321dcb5 PB |
296 | block_job_pause(job); |
297 | } | |
298 | ||
ad90feba | 299 | static void child_job_drained_end(BdrvChild *c) |
f321dcb5 | 300 | { |
ad90feba | 301 | BlockJob *job = c->opaque; |
f321dcb5 PB |
302 | block_job_resume(job); |
303 | } | |
304 | ||
ad90feba KW |
305 | static const BdrvChildRole child_job = { |
306 | .get_parent_desc = child_job_get_parent_desc, | |
307 | .drained_begin = child_job_drained_begin, | |
308 | .drained_end = child_job_drained_end, | |
309 | .stay_at_node = true, | |
f321dcb5 PB |
310 | }; |
311 | ||
bbc02b90 KW |
312 | void block_job_remove_all_bdrv(BlockJob *job) |
313 | { | |
314 | GSList *l; | |
315 | for (l = job->nodes; l; l = l->next) { | |
316 | BdrvChild *c = l->data; | |
317 | bdrv_op_unblock_all(c->bs, job->blocker); | |
318 | bdrv_root_unref_child(c); | |
319 | } | |
320 | g_slist_free(job->nodes); | |
321 | job->nodes = NULL; | |
322 | } | |
323 | ||
76d554e2 KW |
324 | int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs, |
325 | uint64_t perm, uint64_t shared_perm, Error **errp) | |
23d402d4 | 326 | { |
76d554e2 KW |
327 | BdrvChild *c; |
328 | ||
329 | c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm, | |
330 | job, errp); | |
331 | if (c == NULL) { | |
332 | return -EPERM; | |
333 | } | |
334 | ||
335 | job->nodes = g_slist_prepend(job->nodes, c); | |
23d402d4 AG |
336 | bdrv_ref(bs); |
337 | bdrv_op_block_all(bs, job->blocker); | |
76d554e2 KW |
338 | |
339 | return 0; | |
23d402d4 AG |
340 | } |
341 | ||
559b935f JS |
342 | bool block_job_is_internal(BlockJob *job) |
343 | { | |
344 | return (job->id == NULL); | |
345 | } | |
346 | ||
5ccac6f1 JS |
347 | static bool block_job_started(BlockJob *job) |
348 | { | |
349 | return job->co; | |
350 | } | |
351 | ||
e3796a24 JS |
352 | /** |
353 | * All jobs must allow a pause point before entering their job proper. This | |
354 | * ensures that jobs can be paused prior to being started, then resumed later. | |
355 | */ | |
356 | static void coroutine_fn block_job_co_entry(void *opaque) | |
357 | { | |
358 | BlockJob *job = opaque; | |
359 | ||
360 | assert(job && job->driver && job->driver->start); | |
361 | block_job_pause_point(job); | |
362 | job->driver->start(job); | |
363 | } | |
364 | ||
fc24908e PB |
365 | static void block_job_sleep_timer_cb(void *opaque) |
366 | { | |
367 | BlockJob *job = opaque; | |
368 | ||
369 | block_job_enter(job); | |
370 | } | |
371 | ||
5ccac6f1 JS |
372 | void block_job_start(BlockJob *job) |
373 | { | |
374 | assert(job && !block_job_started(job) && job->paused && | |
e3796a24 JS |
375 | job->driver && job->driver->start); |
376 | job->co = qemu_coroutine_create(block_job_co_entry, job); | |
377 | job->pause_count--; | |
378 | job->busy = true; | |
379 | job->paused = false; | |
c9de4050 | 380 | block_job_state_transition(job, BLOCK_JOB_STATUS_RUNNING); |
aef4278c | 381 | bdrv_coroutine_enter(blk_bs(job->blk), job->co); |
5ccac6f1 JS |
382 | } |
383 | ||
3925cd3b JS |
384 | static void block_job_decommission(BlockJob *job) |
385 | { | |
386 | assert(job); | |
387 | job->completed = true; | |
388 | job->busy = false; | |
389 | job->paused = false; | |
390 | job->deferred_to_main_loop = true; | |
391 | block_job_state_transition(job, BLOCK_JOB_STATUS_NULL); | |
392 | block_job_unref(job); | |
393 | } | |
394 | ||
75f71059 JS |
395 | static void block_job_do_dismiss(BlockJob *job) |
396 | { | |
397 | block_job_decommission(job); | |
398 | } | |
399 | ||
e0cf0364 JS |
400 | static void block_job_conclude(BlockJob *job) |
401 | { | |
402 | block_job_state_transition(job, BLOCK_JOB_STATUS_CONCLUDED); | |
75f71059 JS |
403 | if (job->auto_dismiss || !block_job_started(job)) { |
404 | block_job_do_dismiss(job); | |
405 | } | |
e0cf0364 JS |
406 | } |
407 | ||
c55a832f FZ |
408 | static void block_job_completed_single(BlockJob *job) |
409 | { | |
4fb588e9 PB |
410 | assert(job->completed); |
411 | ||
10a3fbb0 JS |
412 | if (job->ret || block_job_is_cancelled(job)) { |
413 | block_job_state_transition(job, BLOCK_JOB_STATUS_ABORTING); | |
414 | } | |
415 | ||
c55a832f FZ |
416 | if (!job->ret) { |
417 | if (job->driver->commit) { | |
418 | job->driver->commit(job); | |
419 | } | |
420 | } else { | |
421 | if (job->driver->abort) { | |
422 | job->driver->abort(job); | |
423 | } | |
424 | } | |
e8a40bf7 JS |
425 | if (job->driver->clean) { |
426 | job->driver->clean(job); | |
427 | } | |
8254b6d9 JS |
428 | |
429 | if (job->cb) { | |
430 | job->cb(job->opaque, job->ret); | |
431 | } | |
5ccac6f1 JS |
432 | |
433 | /* Emit events only if we actually started */ | |
434 | if (block_job_started(job)) { | |
435 | if (block_job_is_cancelled(job)) { | |
436 | block_job_event_cancelled(job); | |
437 | } else { | |
438 | const char *msg = NULL; | |
439 | if (job->ret < 0) { | |
440 | msg = strerror(-job->ret); | |
441 | } | |
442 | block_job_event_completed(job, msg); | |
8254b6d9 | 443 | } |
8254b6d9 JS |
444 | } |
445 | ||
75859b94 JS |
446 | QLIST_REMOVE(job, txn_list); |
447 | block_job_txn_unref(job->txn); | |
e0cf0364 | 448 | block_job_conclude(job); |
c55a832f FZ |
449 | } |
450 | ||
4c241cf5 PB |
451 | static void block_job_cancel_async(BlockJob *job) |
452 | { | |
453 | if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) { | |
454 | block_job_iostatus_reset(job); | |
455 | } | |
456 | if (job->user_paused) { | |
457 | /* Do not call block_job_enter here, the caller will handle it. */ | |
458 | job->user_paused = false; | |
459 | job->pause_count--; | |
460 | } | |
461 | job->cancelled = true; | |
462 | } | |
463 | ||
c8ab5c2d PB |
464 | static int block_job_finish_sync(BlockJob *job, |
465 | void (*finish)(BlockJob *, Error **errp), | |
466 | Error **errp) | |
467 | { | |
468 | Error *local_err = NULL; | |
469 | int ret; | |
470 | ||
471 | assert(blk_bs(job->blk)->job == job); | |
472 | ||
473 | block_job_ref(job); | |
474 | ||
4fb588e9 PB |
475 | if (finish) { |
476 | finish(job, &local_err); | |
477 | } | |
c8ab5c2d PB |
478 | if (local_err) { |
479 | error_propagate(errp, local_err); | |
480 | block_job_unref(job); | |
481 | return -EBUSY; | |
482 | } | |
483 | /* block_job_drain calls block_job_enter, and it should be enough to | |
484 | * induce progress until the job completes or moves to the main thread. | |
485 | */ | |
486 | while (!job->deferred_to_main_loop && !job->completed) { | |
487 | block_job_drain(job); | |
488 | } | |
489 | while (!job->completed) { | |
490 | aio_poll(qemu_get_aio_context(), true); | |
491 | } | |
492 | ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret; | |
493 | block_job_unref(job); | |
494 | return ret; | |
495 | } | |
496 | ||
c55a832f FZ |
497 | static void block_job_completed_txn_abort(BlockJob *job) |
498 | { | |
499 | AioContext *ctx; | |
500 | BlockJobTxn *txn = job->txn; | |
4fb588e9 | 501 | BlockJob *other_job; |
c55a832f FZ |
502 | |
503 | if (txn->aborting) { | |
504 | /* | |
505 | * We are cancelled by another job, which will handle everything. | |
506 | */ | |
507 | return; | |
508 | } | |
509 | txn->aborting = true; | |
4fb588e9 PB |
510 | block_job_txn_ref(txn); |
511 | ||
c55a832f FZ |
512 | /* We are the first failed job. Cancel other jobs. */ |
513 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
b6d2e599 | 514 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
515 | aio_context_acquire(ctx); |
516 | } | |
4fb588e9 PB |
517 | |
518 | /* Other jobs are effectively cancelled by us, set the status for | |
519 | * them; this job, however, may or may not be cancelled, depending | |
520 | * on the caller, so leave it. */ | |
c55a832f | 521 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { |
4fb588e9 PB |
522 | if (other_job != job) { |
523 | block_job_cancel_async(other_job); | |
c55a832f | 524 | } |
c55a832f | 525 | } |
4fb588e9 PB |
526 | while (!QLIST_EMPTY(&txn->jobs)) { |
527 | other_job = QLIST_FIRST(&txn->jobs); | |
b6d2e599 | 528 | ctx = blk_get_aio_context(other_job->blk); |
4fb588e9 PB |
529 | if (!other_job->completed) { |
530 | assert(other_job->cancelled); | |
531 | block_job_finish_sync(other_job, NULL, NULL); | |
532 | } | |
c55a832f FZ |
533 | block_job_completed_single(other_job); |
534 | aio_context_release(ctx); | |
535 | } | |
4fb588e9 PB |
536 | |
537 | block_job_txn_unref(txn); | |
c55a832f FZ |
538 | } |
539 | ||
540 | static void block_job_completed_txn_success(BlockJob *job) | |
541 | { | |
542 | AioContext *ctx; | |
543 | BlockJobTxn *txn = job->txn; | |
544 | BlockJob *other_job, *next; | |
545 | /* | |
546 | * Successful completion, see if there are other running jobs in this | |
547 | * txn. | |
548 | */ | |
549 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
550 | if (!other_job->completed) { | |
551 | return; | |
552 | } | |
553 | } | |
554 | /* We are the last completed job, commit the transaction. */ | |
555 | QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { | |
b6d2e599 | 556 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
557 | aio_context_acquire(ctx); |
558 | assert(other_job->ret == 0); | |
559 | block_job_completed_single(other_job); | |
560 | aio_context_release(ctx); | |
561 | } | |
562 | } | |
563 | ||
aa9ef2e6 JS |
564 | /* Assumes the block_job_mutex is held */ |
565 | static bool block_job_timer_pending(BlockJob *job) | |
566 | { | |
567 | return timer_pending(&job->sleep_timer); | |
568 | } | |
569 | ||
2f0c9fe6 PB |
570 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
571 | { | |
572 | Error *local_err = NULL; | |
aa9ef2e6 | 573 | int64_t old_speed = job->speed; |
2f0c9fe6 | 574 | |
3fc4b10a | 575 | if (!job->driver->set_speed) { |
c6bd8c70 | 576 | error_setg(errp, QERR_UNSUPPORTED); |
2f0c9fe6 PB |
577 | return; |
578 | } | |
0ec4dfb8 JS |
579 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_SET_SPEED, errp)) { |
580 | return; | |
581 | } | |
3fc4b10a | 582 | job->driver->set_speed(job, speed, &local_err); |
84d18f06 | 583 | if (local_err) { |
2f0c9fe6 PB |
584 | error_propagate(errp, local_err); |
585 | return; | |
586 | } | |
587 | ||
588 | job->speed = speed; | |
d4fce188 | 589 | if (speed && speed <= old_speed) { |
aa9ef2e6 JS |
590 | return; |
591 | } | |
592 | ||
593 | /* kick only if a timer is pending */ | |
594 | block_job_enter_cond(job, block_job_timer_pending); | |
2f0c9fe6 PB |
595 | } |
596 | ||
aeae883b PB |
597 | void block_job_complete(BlockJob *job, Error **errp) |
598 | { | |
559b935f JS |
599 | /* Should not be reachable via external interface for internal jobs */ |
600 | assert(job->id); | |
0ec4dfb8 JS |
601 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_COMPLETE, errp)) { |
602 | return; | |
603 | } | |
604 | if (job->pause_count || job->cancelled || !job->driver->complete) { | |
9df229c3 AG |
605 | error_setg(errp, "The active block job '%s' cannot be completed", |
606 | job->id); | |
aeae883b PB |
607 | return; |
608 | } | |
609 | ||
3fc4b10a | 610 | job->driver->complete(job, errp); |
aeae883b PB |
611 | } |
612 | ||
75f71059 JS |
613 | void block_job_dismiss(BlockJob **jobptr, Error **errp) |
614 | { | |
615 | BlockJob *job = *jobptr; | |
616 | /* similarly to _complete, this is QMP-interface only. */ | |
617 | assert(job->id); | |
618 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_DISMISS, errp)) { | |
619 | return; | |
620 | } | |
621 | ||
622 | block_job_do_dismiss(job); | |
623 | *jobptr = NULL; | |
624 | } | |
625 | ||
0ec4dfb8 | 626 | void block_job_user_pause(BlockJob *job, Error **errp) |
0df4ba58 | 627 | { |
0ec4dfb8 JS |
628 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_PAUSE, errp)) { |
629 | return; | |
630 | } | |
631 | if (job->user_paused) { | |
632 | error_setg(errp, "Job is already paused"); | |
633 | return; | |
634 | } | |
0df4ba58 JS |
635 | job->user_paused = true; |
636 | block_job_pause(job); | |
637 | } | |
638 | ||
0df4ba58 JS |
639 | bool block_job_user_paused(BlockJob *job) |
640 | { | |
6573d9c6 | 641 | return job->user_paused; |
0df4ba58 JS |
642 | } |
643 | ||
0ec4dfb8 | 644 | void block_job_user_resume(BlockJob *job, Error **errp) |
0df4ba58 | 645 | { |
0ec4dfb8 JS |
646 | assert(job); |
647 | if (!job->user_paused || job->pause_count <= 0) { | |
648 | error_setg(errp, "Can't resume a job that was not paused"); | |
649 | return; | |
0df4ba58 | 650 | } |
0ec4dfb8 JS |
651 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_RESUME, errp)) { |
652 | return; | |
653 | } | |
654 | block_job_iostatus_reset(job); | |
655 | job->user_paused = false; | |
656 | block_job_resume(job); | |
0df4ba58 JS |
657 | } |
658 | ||
8acc72a4 PB |
659 | void block_job_cancel(BlockJob *job) |
660 | { | |
e0cf0364 | 661 | if (job->status == BLOCK_JOB_STATUS_CONCLUDED) { |
75f71059 | 662 | block_job_do_dismiss(job); |
e0cf0364 | 663 | } else if (block_job_started(job)) { |
4c241cf5 | 664 | block_job_cancel_async(job); |
5ccac6f1 JS |
665 | block_job_enter(job); |
666 | } else { | |
667 | block_job_completed(job, -ECANCELED); | |
668 | } | |
8acc72a4 PB |
669 | } |
670 | ||
0ec4dfb8 JS |
671 | void block_job_user_cancel(BlockJob *job, Error **errp) |
672 | { | |
673 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_CANCEL, errp)) { | |
674 | return; | |
675 | } | |
676 | block_job_cancel(job); | |
677 | } | |
678 | ||
345f9e1b HR |
679 | /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be |
680 | * used with block_job_finish_sync() without the need for (rather nasty) | |
681 | * function pointer casts there. */ | |
682 | static void block_job_cancel_err(BlockJob *job, Error **errp) | |
683 | { | |
684 | block_job_cancel(job); | |
685 | } | |
686 | ||
687 | int block_job_cancel_sync(BlockJob *job) | |
688 | { | |
689 | return block_job_finish_sync(job, &block_job_cancel_err, NULL); | |
690 | } | |
691 | ||
a1a2af07 KW |
692 | void block_job_cancel_sync_all(void) |
693 | { | |
694 | BlockJob *job; | |
695 | AioContext *aio_context; | |
696 | ||
697 | while ((job = QLIST_FIRST(&block_jobs))) { | |
b6d2e599 | 698 | aio_context = blk_get_aio_context(job->blk); |
a1a2af07 KW |
699 | aio_context_acquire(aio_context); |
700 | block_job_cancel_sync(job); | |
701 | aio_context_release(aio_context); | |
702 | } | |
703 | } | |
704 | ||
345f9e1b HR |
705 | int block_job_complete_sync(BlockJob *job, Error **errp) |
706 | { | |
707 | return block_job_finish_sync(job, &block_job_complete, errp); | |
708 | } | |
709 | ||
559b935f | 710 | BlockJobInfo *block_job_query(BlockJob *job, Error **errp) |
30e628b7 | 711 | { |
559b935f JS |
712 | BlockJobInfo *info; |
713 | ||
714 | if (block_job_is_internal(job)) { | |
715 | error_setg(errp, "Cannot query QEMU internal jobs"); | |
716 | return NULL; | |
717 | } | |
718 | info = g_new0(BlockJobInfo, 1); | |
977c736f | 719 | info->type = g_strdup(BlockJobType_str(job->driver->job_type)); |
8ccb9569 | 720 | info->device = g_strdup(job->id); |
32c81a4a | 721 | info->len = job->len; |
fc24908e | 722 | info->busy = atomic_read(&job->busy); |
751ebd76 | 723 | info->paused = job->pause_count > 0; |
32c81a4a PB |
724 | info->offset = job->offset; |
725 | info->speed = job->speed; | |
726 | info->io_status = job->iostatus; | |
ef6dbf1e | 727 | info->ready = job->ready; |
58b295ba | 728 | info->status = job->status; |
30e628b7 PB |
729 | return info; |
730 | } | |
32c81a4a PB |
731 | |
732 | static void block_job_iostatus_set_err(BlockJob *job, int error) | |
733 | { | |
734 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
735 | job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
736 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
737 | } | |
738 | } | |
739 | ||
8254b6d9 | 740 | static void block_job_event_cancelled(BlockJob *job) |
bcada37b | 741 | { |
559b935f JS |
742 | if (block_job_is_internal(job)) { |
743 | return; | |
744 | } | |
745 | ||
bcada37b | 746 | qapi_event_send_block_job_cancelled(job->driver->job_type, |
8ccb9569 | 747 | job->id, |
bcada37b WX |
748 | job->len, |
749 | job->offset, | |
750 | job->speed, | |
751 | &error_abort); | |
752 | } | |
32c81a4a | 753 | |
8254b6d9 | 754 | static void block_job_event_completed(BlockJob *job, const char *msg) |
a66a2a36 | 755 | { |
559b935f JS |
756 | if (block_job_is_internal(job)) { |
757 | return; | |
758 | } | |
759 | ||
bcada37b | 760 | qapi_event_send_block_job_completed(job->driver->job_type, |
8ccb9569 | 761 | job->id, |
bcada37b WX |
762 | job->len, |
763 | job->offset, | |
764 | job->speed, | |
765 | !!msg, | |
766 | msg, | |
767 | &error_abort); | |
a66a2a36 PB |
768 | } |
769 | ||
88691b37 PB |
770 | /* |
771 | * API for block job drivers and the block layer. These functions are | |
772 | * declared in blockjob_int.h. | |
773 | */ | |
774 | ||
775 | void *block_job_create(const char *job_id, const BlockJobDriver *driver, | |
75859b94 | 776 | BlockJobTxn *txn, BlockDriverState *bs, uint64_t perm, |
88691b37 PB |
777 | uint64_t shared_perm, int64_t speed, int flags, |
778 | BlockCompletionFunc *cb, void *opaque, Error **errp) | |
779 | { | |
780 | BlockBackend *blk; | |
781 | BlockJob *job; | |
782 | int ret; | |
783 | ||
784 | if (bs->job) { | |
785 | error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); | |
786 | return NULL; | |
787 | } | |
788 | ||
789 | if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) { | |
790 | job_id = bdrv_get_device_name(bs); | |
791 | if (!*job_id) { | |
792 | error_setg(errp, "An explicit job ID is required for this node"); | |
793 | return NULL; | |
794 | } | |
795 | } | |
796 | ||
797 | if (job_id) { | |
798 | if (flags & BLOCK_JOB_INTERNAL) { | |
799 | error_setg(errp, "Cannot specify job ID for internal block job"); | |
800 | return NULL; | |
801 | } | |
802 | ||
803 | if (!id_wellformed(job_id)) { | |
804 | error_setg(errp, "Invalid job ID '%s'", job_id); | |
805 | return NULL; | |
806 | } | |
807 | ||
808 | if (block_job_get(job_id)) { | |
809 | error_setg(errp, "Job ID '%s' already in use", job_id); | |
810 | return NULL; | |
811 | } | |
812 | } | |
813 | ||
814 | blk = blk_new(perm, shared_perm); | |
815 | ret = blk_insert_bs(blk, bs, errp); | |
816 | if (ret < 0) { | |
817 | blk_unref(blk); | |
818 | return NULL; | |
819 | } | |
820 | ||
821 | job = g_malloc0(driver->instance_size); | |
822 | job->driver = driver; | |
823 | job->id = g_strdup(job_id); | |
824 | job->blk = blk; | |
825 | job->cb = cb; | |
826 | job->opaque = opaque; | |
827 | job->busy = false; | |
828 | job->paused = true; | |
829 | job->pause_count = 1; | |
830 | job->refcnt = 1; | |
75f71059 | 831 | job->auto_dismiss = !(flags & BLOCK_JOB_MANUAL_DISMISS); |
c9de4050 | 832 | block_job_state_transition(job, BLOCK_JOB_STATUS_CREATED); |
fc24908e PB |
833 | aio_timer_init(qemu_get_aio_context(), &job->sleep_timer, |
834 | QEMU_CLOCK_REALTIME, SCALE_NS, | |
835 | block_job_sleep_timer_cb, job); | |
88691b37 PB |
836 | |
837 | error_setg(&job->blocker, "block device is in use by block job: %s", | |
977c736f | 838 | BlockJobType_str(driver->job_type)); |
88691b37 PB |
839 | block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort); |
840 | bs->job = job; | |
841 | ||
88691b37 PB |
842 | bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); |
843 | ||
844 | QLIST_INSERT_HEAD(&block_jobs, job, job_list); | |
845 | ||
846 | blk_add_aio_context_notifier(blk, block_job_attached_aio_context, | |
847 | block_job_detach_aio_context, job); | |
848 | ||
849 | /* Only set speed when necessary to avoid NotSupported error */ | |
850 | if (speed != 0) { | |
851 | Error *local_err = NULL; | |
852 | ||
853 | block_job_set_speed(job, speed, &local_err); | |
854 | if (local_err) { | |
3925cd3b | 855 | block_job_early_fail(job); |
88691b37 PB |
856 | error_propagate(errp, local_err); |
857 | return NULL; | |
858 | } | |
859 | } | |
75859b94 JS |
860 | |
861 | /* Single jobs are modeled as single-job transactions for sake of | |
862 | * consolidating the job management logic */ | |
863 | if (!txn) { | |
864 | txn = block_job_txn_new(); | |
865 | block_job_txn_add_job(txn, job); | |
866 | block_job_txn_unref(txn); | |
867 | } else { | |
868 | block_job_txn_add_job(txn, job); | |
869 | } | |
870 | ||
88691b37 PB |
871 | return job; |
872 | } | |
873 | ||
f321dcb5 PB |
874 | void block_job_pause_all(void) |
875 | { | |
876 | BlockJob *job = NULL; | |
877 | while ((job = block_job_next(job))) { | |
878 | AioContext *aio_context = blk_get_aio_context(job->blk); | |
879 | ||
880 | aio_context_acquire(aio_context); | |
3d5d319e | 881 | block_job_ref(job); |
f321dcb5 PB |
882 | block_job_pause(job); |
883 | aio_context_release(aio_context); | |
884 | } | |
885 | } | |
886 | ||
88691b37 PB |
887 | void block_job_early_fail(BlockJob *job) |
888 | { | |
3925cd3b JS |
889 | assert(job->status == BLOCK_JOB_STATUS_CREATED); |
890 | block_job_decommission(job); | |
88691b37 PB |
891 | } |
892 | ||
893 | void block_job_completed(BlockJob *job, int ret) | |
894 | { | |
75859b94 | 895 | assert(job && job->txn && !job->completed); |
88691b37 | 896 | assert(blk_bs(job->blk)->job == job); |
88691b37 PB |
897 | job->completed = true; |
898 | job->ret = ret; | |
75859b94 | 899 | if (ret < 0 || block_job_is_cancelled(job)) { |
88691b37 PB |
900 | block_job_completed_txn_abort(job); |
901 | } else { | |
902 | block_job_completed_txn_success(job); | |
903 | } | |
904 | } | |
905 | ||
906 | static bool block_job_should_pause(BlockJob *job) | |
907 | { | |
908 | return job->pause_count > 0; | |
909 | } | |
910 | ||
fc24908e PB |
911 | /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds. |
912 | * Reentering the job coroutine with block_job_enter() before the timer has | |
913 | * expired is allowed and cancels the timer. | |
914 | * | |
915 | * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be | |
916 | * called explicitly. */ | |
917 | static void block_job_do_yield(BlockJob *job, uint64_t ns) | |
356f59b8 | 918 | { |
fc24908e PB |
919 | block_job_lock(); |
920 | if (ns != -1) { | |
921 | timer_mod(&job->sleep_timer, ns); | |
922 | } | |
356f59b8 | 923 | job->busy = false; |
fc24908e | 924 | block_job_unlock(); |
356f59b8 PB |
925 | qemu_coroutine_yield(); |
926 | ||
927 | /* Set by block_job_enter before re-entering the coroutine. */ | |
928 | assert(job->busy); | |
929 | } | |
930 | ||
88691b37 PB |
931 | void coroutine_fn block_job_pause_point(BlockJob *job) |
932 | { | |
933 | assert(job && block_job_started(job)); | |
934 | ||
935 | if (!block_job_should_pause(job)) { | |
936 | return; | |
937 | } | |
938 | if (block_job_is_cancelled(job)) { | |
939 | return; | |
940 | } | |
941 | ||
942 | if (job->driver->pause) { | |
943 | job->driver->pause(job); | |
944 | } | |
945 | ||
946 | if (block_job_should_pause(job) && !block_job_is_cancelled(job)) { | |
58b295ba | 947 | BlockJobStatus status = job->status; |
c9de4050 JS |
948 | block_job_state_transition(job, status == BLOCK_JOB_STATUS_READY ? \ |
949 | BLOCK_JOB_STATUS_STANDBY : \ | |
950 | BLOCK_JOB_STATUS_PAUSED); | |
88691b37 | 951 | job->paused = true; |
fc24908e | 952 | block_job_do_yield(job, -1); |
88691b37 | 953 | job->paused = false; |
c9de4050 | 954 | block_job_state_transition(job, status); |
88691b37 PB |
955 | } |
956 | ||
957 | if (job->driver->resume) { | |
958 | job->driver->resume(job); | |
959 | } | |
960 | } | |
961 | ||
f321dcb5 PB |
962 | void block_job_resume_all(void) |
963 | { | |
3d5d319e AG |
964 | BlockJob *job, *next; |
965 | ||
966 | QLIST_FOREACH_SAFE(job, &block_jobs, job_list, next) { | |
f321dcb5 PB |
967 | AioContext *aio_context = blk_get_aio_context(job->blk); |
968 | ||
969 | aio_context_acquire(aio_context); | |
970 | block_job_resume(job); | |
3d5d319e | 971 | block_job_unref(job); |
f321dcb5 PB |
972 | aio_context_release(aio_context); |
973 | } | |
974 | } | |
975 | ||
aa9ef2e6 JS |
976 | /* |
977 | * Conditionally enter a block_job pending a call to fn() while | |
978 | * under the block_job_lock critical section. | |
979 | */ | |
980 | static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job)) | |
88691b37 | 981 | { |
eb05e011 PB |
982 | if (!block_job_started(job)) { |
983 | return; | |
984 | } | |
985 | if (job->deferred_to_main_loop) { | |
986 | return; | |
987 | } | |
988 | ||
fc24908e | 989 | block_job_lock(); |
356f59b8 | 990 | if (job->busy) { |
fc24908e | 991 | block_job_unlock(); |
356f59b8 | 992 | return; |
88691b37 | 993 | } |
356f59b8 | 994 | |
aa9ef2e6 JS |
995 | if (fn && !fn(job)) { |
996 | block_job_unlock(); | |
997 | return; | |
998 | } | |
999 | ||
fc24908e PB |
1000 | assert(!job->deferred_to_main_loop); |
1001 | timer_del(&job->sleep_timer); | |
356f59b8 | 1002 | job->busy = true; |
fc24908e | 1003 | block_job_unlock(); |
356f59b8 | 1004 | aio_co_wake(job->co); |
88691b37 PB |
1005 | } |
1006 | ||
aa9ef2e6 JS |
1007 | void block_job_enter(BlockJob *job) |
1008 | { | |
1009 | block_job_enter_cond(job, NULL); | |
1010 | } | |
1011 | ||
88691b37 PB |
1012 | bool block_job_is_cancelled(BlockJob *job) |
1013 | { | |
1014 | return job->cancelled; | |
1015 | } | |
1016 | ||
5bf1d5a7 | 1017 | void block_job_sleep_ns(BlockJob *job, int64_t ns) |
88691b37 PB |
1018 | { |
1019 | assert(job->busy); | |
1020 | ||
1021 | /* Check cancellation *before* setting busy = false, too! */ | |
1022 | if (block_job_is_cancelled(job)) { | |
1023 | return; | |
1024 | } | |
1025 | ||
88691b37 | 1026 | if (!block_job_should_pause(job)) { |
fc24908e | 1027 | block_job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns); |
88691b37 | 1028 | } |
88691b37 PB |
1029 | |
1030 | block_job_pause_point(job); | |
1031 | } | |
1032 | ||
1033 | void block_job_yield(BlockJob *job) | |
1034 | { | |
1035 | assert(job->busy); | |
1036 | ||
1037 | /* Check cancellation *before* setting busy = false, too! */ | |
1038 | if (block_job_is_cancelled(job)) { | |
1039 | return; | |
1040 | } | |
1041 | ||
88691b37 | 1042 | if (!block_job_should_pause(job)) { |
fc24908e | 1043 | block_job_do_yield(job, -1); |
88691b37 | 1044 | } |
88691b37 PB |
1045 | |
1046 | block_job_pause_point(job); | |
1047 | } | |
1048 | ||
2caf63a9 PB |
1049 | void block_job_iostatus_reset(BlockJob *job) |
1050 | { | |
4c241cf5 PB |
1051 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
1052 | return; | |
1053 | } | |
1054 | assert(job->user_paused && job->pause_count > 0); | |
2caf63a9 PB |
1055 | job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
1056 | } | |
1057 | ||
bcada37b | 1058 | void block_job_event_ready(BlockJob *job) |
a66a2a36 | 1059 | { |
c9de4050 | 1060 | block_job_state_transition(job, BLOCK_JOB_STATUS_READY); |
ef6dbf1e HR |
1061 | job->ready = true; |
1062 | ||
559b935f JS |
1063 | if (block_job_is_internal(job)) { |
1064 | return; | |
1065 | } | |
1066 | ||
518848a2 | 1067 | qapi_event_send_block_job_ready(job->driver->job_type, |
8ccb9569 | 1068 | job->id, |
518848a2 MA |
1069 | job->len, |
1070 | job->offset, | |
1071 | job->speed, &error_abort); | |
a66a2a36 PB |
1072 | } |
1073 | ||
81e254dc | 1074 | BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err, |
32c81a4a PB |
1075 | int is_read, int error) |
1076 | { | |
1077 | BlockErrorAction action; | |
1078 | ||
1079 | switch (on_err) { | |
1080 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
8c398252 | 1081 | case BLOCKDEV_ON_ERROR_AUTO: |
a589569f WX |
1082 | action = (error == ENOSPC) ? |
1083 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
32c81a4a PB |
1084 | break; |
1085 | case BLOCKDEV_ON_ERROR_STOP: | |
a589569f | 1086 | action = BLOCK_ERROR_ACTION_STOP; |
32c81a4a PB |
1087 | break; |
1088 | case BLOCKDEV_ON_ERROR_REPORT: | |
a589569f | 1089 | action = BLOCK_ERROR_ACTION_REPORT; |
32c81a4a PB |
1090 | break; |
1091 | case BLOCKDEV_ON_ERROR_IGNORE: | |
a589569f | 1092 | action = BLOCK_ERROR_ACTION_IGNORE; |
32c81a4a PB |
1093 | break; |
1094 | default: | |
1095 | abort(); | |
1096 | } | |
559b935f JS |
1097 | if (!block_job_is_internal(job)) { |
1098 | qapi_event_send_block_job_error(job->id, | |
1099 | is_read ? IO_OPERATION_TYPE_READ : | |
1100 | IO_OPERATION_TYPE_WRITE, | |
1101 | action, &error_abort); | |
1102 | } | |
a589569f | 1103 | if (action == BLOCK_ERROR_ACTION_STOP) { |
0ec4dfb8 | 1104 | block_job_pause(job); |
751ebd76 | 1105 | /* make the pause user visible, which will be resumed from QMP. */ |
0ec4dfb8 | 1106 | job->user_paused = true; |
32c81a4a | 1107 | block_job_iostatus_set_err(job, error); |
32c81a4a PB |
1108 | } |
1109 | return action; | |
1110 | } | |
dec7d421 SH |
1111 | |
1112 | typedef struct { | |
1113 | BlockJob *job; | |
dec7d421 SH |
1114 | AioContext *aio_context; |
1115 | BlockJobDeferToMainLoopFn *fn; | |
1116 | void *opaque; | |
1117 | } BlockJobDeferToMainLoopData; | |
1118 | ||
1119 | static void block_job_defer_to_main_loop_bh(void *opaque) | |
1120 | { | |
1121 | BlockJobDeferToMainLoopData *data = opaque; | |
1122 | AioContext *aio_context; | |
1123 | ||
dec7d421 SH |
1124 | /* Prevent race with block_job_defer_to_main_loop() */ |
1125 | aio_context_acquire(data->aio_context); | |
1126 | ||
1127 | /* Fetch BDS AioContext again, in case it has changed */ | |
b6d2e599 | 1128 | aio_context = blk_get_aio_context(data->job->blk); |
d79df2a2 PB |
1129 | if (aio_context != data->aio_context) { |
1130 | aio_context_acquire(aio_context); | |
1131 | } | |
dec7d421 SH |
1132 | |
1133 | data->fn(data->job, data->opaque); | |
1134 | ||
d79df2a2 PB |
1135 | if (aio_context != data->aio_context) { |
1136 | aio_context_release(aio_context); | |
1137 | } | |
dec7d421 SH |
1138 | |
1139 | aio_context_release(data->aio_context); | |
1140 | ||
1141 | g_free(data); | |
1142 | } | |
1143 | ||
1144 | void block_job_defer_to_main_loop(BlockJob *job, | |
1145 | BlockJobDeferToMainLoopFn *fn, | |
1146 | void *opaque) | |
1147 | { | |
1148 | BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); | |
1149 | data->job = job; | |
b6d2e599 | 1150 | data->aio_context = blk_get_aio_context(job->blk); |
dec7d421 SH |
1151 | data->fn = fn; |
1152 | data->opaque = opaque; | |
794f0141 | 1153 | job->deferred_to_main_loop = true; |
dec7d421 | 1154 | |
fffb6e12 PB |
1155 | aio_bh_schedule_oneshot(qemu_get_aio_context(), |
1156 | block_job_defer_to_main_loop_bh, data); | |
dec7d421 | 1157 | } |