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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] = { | |
5f241594 JS |
47 | /* U, C, R, P, Y, S, W, D, X, E, N */ |
48 | /* U: */ [BLOCK_JOB_STATUS_UNDEFINED] = {0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, | |
49 | /* C: */ [BLOCK_JOB_STATUS_CREATED] = {0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1}, | |
50 | /* R: */ [BLOCK_JOB_STATUS_RUNNING] = {0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0}, | |
51 | /* P: */ [BLOCK_JOB_STATUS_PAUSED] = {0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0}, | |
52 | /* Y: */ [BLOCK_JOB_STATUS_READY] = {0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0}, | |
53 | /* S: */ [BLOCK_JOB_STATUS_STANDBY] = {0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0}, | |
54 | /* W: */ [BLOCK_JOB_STATUS_WAITING] = {0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0}, | |
55 | /* D: */ [BLOCK_JOB_STATUS_PENDING] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0}, | |
56 | /* X: */ [BLOCK_JOB_STATUS_ABORTING] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0}, | |
57 | /* E: */ [BLOCK_JOB_STATUS_CONCLUDED] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, | |
58 | /* N: */ [BLOCK_JOB_STATUS_NULL] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, | |
c9de4050 JS |
59 | }; |
60 | ||
0ec4dfb8 | 61 | bool BlockJobVerbTable[BLOCK_JOB_VERB__MAX][BLOCK_JOB_STATUS__MAX] = { |
5f241594 JS |
62 | /* U, C, R, P, Y, S, W, D, X, E, N */ |
63 | [BLOCK_JOB_VERB_CANCEL] = {0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0}, | |
64 | [BLOCK_JOB_VERB_PAUSE] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0}, | |
65 | [BLOCK_JOB_VERB_RESUME] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0}, | |
66 | [BLOCK_JOB_VERB_SET_SPEED] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0}, | |
67 | [BLOCK_JOB_VERB_COMPLETE] = {0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0}, | |
68 | [BLOCK_JOB_VERB_DISMISS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0}, | |
0ec4dfb8 JS |
69 | }; |
70 | ||
c9de4050 JS |
71 | static void block_job_state_transition(BlockJob *job, BlockJobStatus s1) |
72 | { | |
73 | BlockJobStatus s0 = job->status; | |
74 | assert(s1 >= 0 && s1 <= BLOCK_JOB_STATUS__MAX); | |
75 | trace_block_job_state_transition(job, job->ret, BlockJobSTT[s0][s1] ? | |
76 | "allowed" : "disallowed", | |
77 | qapi_enum_lookup(&BlockJobStatus_lookup, | |
78 | s0), | |
79 | qapi_enum_lookup(&BlockJobStatus_lookup, | |
80 | s1)); | |
81 | assert(BlockJobSTT[s0][s1]); | |
82 | job->status = s1; | |
83 | } | |
84 | ||
0ec4dfb8 JS |
85 | static int block_job_apply_verb(BlockJob *job, BlockJobVerb bv, Error **errp) |
86 | { | |
87 | assert(bv >= 0 && bv <= BLOCK_JOB_VERB__MAX); | |
88 | trace_block_job_apply_verb(job, qapi_enum_lookup(&BlockJobStatus_lookup, | |
89 | job->status), | |
90 | qapi_enum_lookup(&BlockJobVerb_lookup, bv), | |
91 | BlockJobVerbTable[bv][job->status] ? | |
92 | "allowed" : "prohibited"); | |
93 | if (BlockJobVerbTable[bv][job->status]) { | |
94 | return 0; | |
95 | } | |
96 | error_setg(errp, "Job '%s' in state '%s' cannot accept command verb '%s'", | |
97 | job->id, qapi_enum_lookup(&BlockJobStatus_lookup, job->status), | |
98 | qapi_enum_lookup(&BlockJobVerb_lookup, bv)); | |
99 | return -EPERM; | |
100 | } | |
101 | ||
fc24908e PB |
102 | static void block_job_lock(void) |
103 | { | |
104 | qemu_mutex_lock(&block_job_mutex); | |
105 | } | |
106 | ||
107 | static void block_job_unlock(void) | |
108 | { | |
109 | qemu_mutex_unlock(&block_job_mutex); | |
110 | } | |
111 | ||
112 | static void __attribute__((__constructor__)) block_job_init(void) | |
113 | { | |
114 | qemu_mutex_init(&block_job_mutex); | |
115 | } | |
116 | ||
8254b6d9 JS |
117 | static void block_job_event_cancelled(BlockJob *job); |
118 | static void block_job_event_completed(BlockJob *job, const char *msg); | |
5f241594 | 119 | static int block_job_event_pending(BlockJob *job); |
aa9ef2e6 | 120 | static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job)); |
8254b6d9 | 121 | |
c55a832f FZ |
122 | /* Transactional group of block jobs */ |
123 | struct BlockJobTxn { | |
124 | ||
125 | /* Is this txn being cancelled? */ | |
126 | bool aborting; | |
127 | ||
128 | /* List of jobs */ | |
129 | QLIST_HEAD(, BlockJob) jobs; | |
130 | ||
131 | /* Reference count */ | |
132 | int refcnt; | |
133 | }; | |
134 | ||
a7112795 AG |
135 | static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs); |
136 | ||
88691b37 PB |
137 | /* |
138 | * The block job API is composed of two categories of functions. | |
139 | * | |
140 | * The first includes functions used by the monitor. The monitor is | |
141 | * peculiar in that it accesses the block job list with block_job_get, and | |
142 | * therefore needs consistency across block_job_get and the actual operation | |
143 | * (e.g. block_job_set_speed). The consistency is achieved with | |
144 | * aio_context_acquire/release. These functions are declared in blockjob.h. | |
145 | * | |
146 | * The second includes functions used by the block job drivers and sometimes | |
147 | * by the core block layer. These do not care about locking, because the | |
148 | * whole coroutine runs under the AioContext lock, and are declared in | |
149 | * blockjob_int.h. | |
150 | */ | |
151 | ||
a7112795 AG |
152 | BlockJob *block_job_next(BlockJob *job) |
153 | { | |
154 | if (!job) { | |
155 | return QLIST_FIRST(&block_jobs); | |
156 | } | |
157 | return QLIST_NEXT(job, job_list); | |
158 | } | |
159 | ||
ffb1f10c AG |
160 | BlockJob *block_job_get(const char *id) |
161 | { | |
162 | BlockJob *job; | |
163 | ||
164 | QLIST_FOREACH(job, &block_jobs, job_list) { | |
559b935f | 165 | if (job->id && !strcmp(id, job->id)) { |
ffb1f10c AG |
166 | return job; |
167 | } | |
168 | } | |
169 | ||
170 | return NULL; | |
171 | } | |
172 | ||
c8ab5c2d PB |
173 | BlockJobTxn *block_job_txn_new(void) |
174 | { | |
175 | BlockJobTxn *txn = g_new0(BlockJobTxn, 1); | |
176 | QLIST_INIT(&txn->jobs); | |
177 | txn->refcnt = 1; | |
178 | return txn; | |
179 | } | |
180 | ||
181 | static void block_job_txn_ref(BlockJobTxn *txn) | |
182 | { | |
183 | txn->refcnt++; | |
184 | } | |
185 | ||
186 | void block_job_txn_unref(BlockJobTxn *txn) | |
187 | { | |
188 | if (txn && --txn->refcnt == 0) { | |
189 | g_free(txn); | |
190 | } | |
191 | } | |
192 | ||
193 | void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job) | |
194 | { | |
195 | if (!txn) { | |
196 | return; | |
197 | } | |
198 | ||
199 | assert(!job->txn); | |
200 | job->txn = txn; | |
201 | ||
202 | QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); | |
203 | block_job_txn_ref(txn); | |
204 | } | |
205 | ||
f321dcb5 PB |
206 | static void block_job_pause(BlockJob *job) |
207 | { | |
208 | job->pause_count++; | |
209 | } | |
210 | ||
211 | static void block_job_resume(BlockJob *job) | |
212 | { | |
213 | assert(job->pause_count > 0); | |
214 | job->pause_count--; | |
215 | if (job->pause_count) { | |
216 | return; | |
217 | } | |
218 | block_job_enter(job); | |
219 | } | |
220 | ||
4172a003 | 221 | void block_job_ref(BlockJob *job) |
05b0d8e3 PB |
222 | { |
223 | ++job->refcnt; | |
224 | } | |
225 | ||
226 | static void block_job_attached_aio_context(AioContext *new_context, | |
227 | void *opaque); | |
228 | static void block_job_detach_aio_context(void *opaque); | |
229 | ||
4172a003 | 230 | void block_job_unref(BlockJob *job) |
05b0d8e3 PB |
231 | { |
232 | if (--job->refcnt == 0) { | |
3925cd3b | 233 | assert(job->status == BLOCK_JOB_STATUS_NULL); |
05b0d8e3 | 234 | BlockDriverState *bs = blk_bs(job->blk); |
0a3e155f | 235 | QLIST_REMOVE(job, job_list); |
05b0d8e3 PB |
236 | bs->job = NULL; |
237 | block_job_remove_all_bdrv(job); | |
238 | blk_remove_aio_context_notifier(job->blk, | |
239 | block_job_attached_aio_context, | |
240 | block_job_detach_aio_context, job); | |
241 | blk_unref(job->blk); | |
242 | error_free(job->blocker); | |
243 | g_free(job->id); | |
fc24908e | 244 | assert(!timer_pending(&job->sleep_timer)); |
05b0d8e3 PB |
245 | g_free(job); |
246 | } | |
247 | } | |
248 | ||
463e0be1 SH |
249 | static void block_job_attached_aio_context(AioContext *new_context, |
250 | void *opaque) | |
251 | { | |
252 | BlockJob *job = opaque; | |
253 | ||
254 | if (job->driver->attached_aio_context) { | |
255 | job->driver->attached_aio_context(job, new_context); | |
256 | } | |
257 | ||
258 | block_job_resume(job); | |
259 | } | |
260 | ||
bae8196d PB |
261 | static void block_job_drain(BlockJob *job) |
262 | { | |
263 | /* If job is !job->busy this kicks it into the next pause point. */ | |
264 | block_job_enter(job); | |
265 | ||
266 | blk_drain(job->blk); | |
267 | if (job->driver->drain) { | |
268 | job->driver->drain(job); | |
269 | } | |
270 | } | |
271 | ||
463e0be1 SH |
272 | static void block_job_detach_aio_context(void *opaque) |
273 | { | |
274 | BlockJob *job = opaque; | |
275 | ||
276 | /* In case the job terminates during aio_poll()... */ | |
277 | block_job_ref(job); | |
278 | ||
279 | block_job_pause(job); | |
280 | ||
463e0be1 | 281 | while (!job->paused && !job->completed) { |
bae8196d | 282 | block_job_drain(job); |
463e0be1 SH |
283 | } |
284 | ||
285 | block_job_unref(job); | |
286 | } | |
287 | ||
f321dcb5 PB |
288 | static char *child_job_get_parent_desc(BdrvChild *c) |
289 | { | |
290 | BlockJob *job = c->opaque; | |
291 | return g_strdup_printf("%s job '%s'", | |
977c736f | 292 | BlockJobType_str(job->driver->job_type), |
f321dcb5 PB |
293 | job->id); |
294 | } | |
295 | ||
ad90feba | 296 | static void child_job_drained_begin(BdrvChild *c) |
f321dcb5 | 297 | { |
ad90feba | 298 | BlockJob *job = c->opaque; |
f321dcb5 PB |
299 | block_job_pause(job); |
300 | } | |
301 | ||
ad90feba | 302 | static void child_job_drained_end(BdrvChild *c) |
f321dcb5 | 303 | { |
ad90feba | 304 | BlockJob *job = c->opaque; |
f321dcb5 PB |
305 | block_job_resume(job); |
306 | } | |
307 | ||
ad90feba KW |
308 | static const BdrvChildRole child_job = { |
309 | .get_parent_desc = child_job_get_parent_desc, | |
310 | .drained_begin = child_job_drained_begin, | |
311 | .drained_end = child_job_drained_end, | |
312 | .stay_at_node = true, | |
f321dcb5 PB |
313 | }; |
314 | ||
bbc02b90 KW |
315 | void block_job_remove_all_bdrv(BlockJob *job) |
316 | { | |
317 | GSList *l; | |
318 | for (l = job->nodes; l; l = l->next) { | |
319 | BdrvChild *c = l->data; | |
320 | bdrv_op_unblock_all(c->bs, job->blocker); | |
321 | bdrv_root_unref_child(c); | |
322 | } | |
323 | g_slist_free(job->nodes); | |
324 | job->nodes = NULL; | |
325 | } | |
326 | ||
76d554e2 KW |
327 | int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs, |
328 | uint64_t perm, uint64_t shared_perm, Error **errp) | |
23d402d4 | 329 | { |
76d554e2 KW |
330 | BdrvChild *c; |
331 | ||
332 | c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm, | |
333 | job, errp); | |
334 | if (c == NULL) { | |
335 | return -EPERM; | |
336 | } | |
337 | ||
338 | job->nodes = g_slist_prepend(job->nodes, c); | |
23d402d4 AG |
339 | bdrv_ref(bs); |
340 | bdrv_op_block_all(bs, job->blocker); | |
76d554e2 KW |
341 | |
342 | return 0; | |
23d402d4 AG |
343 | } |
344 | ||
559b935f JS |
345 | bool block_job_is_internal(BlockJob *job) |
346 | { | |
347 | return (job->id == NULL); | |
348 | } | |
349 | ||
5ccac6f1 JS |
350 | static bool block_job_started(BlockJob *job) |
351 | { | |
352 | return job->co; | |
353 | } | |
354 | ||
e3796a24 JS |
355 | /** |
356 | * All jobs must allow a pause point before entering their job proper. This | |
357 | * ensures that jobs can be paused prior to being started, then resumed later. | |
358 | */ | |
359 | static void coroutine_fn block_job_co_entry(void *opaque) | |
360 | { | |
361 | BlockJob *job = opaque; | |
362 | ||
363 | assert(job && job->driver && job->driver->start); | |
364 | block_job_pause_point(job); | |
365 | job->driver->start(job); | |
366 | } | |
367 | ||
fc24908e PB |
368 | static void block_job_sleep_timer_cb(void *opaque) |
369 | { | |
370 | BlockJob *job = opaque; | |
371 | ||
372 | block_job_enter(job); | |
373 | } | |
374 | ||
5ccac6f1 JS |
375 | void block_job_start(BlockJob *job) |
376 | { | |
377 | assert(job && !block_job_started(job) && job->paused && | |
e3796a24 JS |
378 | job->driver && job->driver->start); |
379 | job->co = qemu_coroutine_create(block_job_co_entry, job); | |
380 | job->pause_count--; | |
381 | job->busy = true; | |
382 | job->paused = false; | |
c9de4050 | 383 | block_job_state_transition(job, BLOCK_JOB_STATUS_RUNNING); |
aef4278c | 384 | bdrv_coroutine_enter(blk_bs(job->blk), job->co); |
5ccac6f1 JS |
385 | } |
386 | ||
3925cd3b JS |
387 | static void block_job_decommission(BlockJob *job) |
388 | { | |
389 | assert(job); | |
390 | job->completed = true; | |
391 | job->busy = false; | |
392 | job->paused = false; | |
393 | job->deferred_to_main_loop = true; | |
394 | block_job_state_transition(job, BLOCK_JOB_STATUS_NULL); | |
395 | block_job_unref(job); | |
396 | } | |
397 | ||
75f71059 JS |
398 | static void block_job_do_dismiss(BlockJob *job) |
399 | { | |
400 | block_job_decommission(job); | |
401 | } | |
402 | ||
e0cf0364 JS |
403 | static void block_job_conclude(BlockJob *job) |
404 | { | |
405 | block_job_state_transition(job, BLOCK_JOB_STATUS_CONCLUDED); | |
75f71059 JS |
406 | if (job->auto_dismiss || !block_job_started(job)) { |
407 | block_job_do_dismiss(job); | |
408 | } | |
e0cf0364 JS |
409 | } |
410 | ||
35d6b368 JS |
411 | static void block_job_update_rc(BlockJob *job) |
412 | { | |
413 | if (!job->ret && block_job_is_cancelled(job)) { | |
414 | job->ret = -ECANCELED; | |
415 | } | |
416 | if (job->ret) { | |
417 | block_job_state_transition(job, BLOCK_JOB_STATUS_ABORTING); | |
418 | } | |
419 | } | |
420 | ||
2da4617a JS |
421 | static int block_job_prepare(BlockJob *job) |
422 | { | |
423 | if (job->ret == 0 && job->driver->prepare) { | |
424 | job->ret = job->driver->prepare(job); | |
425 | } | |
426 | return job->ret; | |
427 | } | |
428 | ||
43628d93 JS |
429 | static void block_job_commit(BlockJob *job) |
430 | { | |
431 | assert(!job->ret); | |
432 | if (job->driver->commit) { | |
433 | job->driver->commit(job); | |
434 | } | |
435 | } | |
436 | ||
437 | static void block_job_abort(BlockJob *job) | |
438 | { | |
439 | assert(job->ret); | |
440 | if (job->driver->abort) { | |
441 | job->driver->abort(job); | |
442 | } | |
443 | } | |
444 | ||
445 | static void block_job_clean(BlockJob *job) | |
446 | { | |
447 | if (job->driver->clean) { | |
448 | job->driver->clean(job); | |
449 | } | |
450 | } | |
451 | ||
2da4617a | 452 | static int block_job_completed_single(BlockJob *job) |
c55a832f | 453 | { |
4fb588e9 PB |
454 | assert(job->completed); |
455 | ||
35d6b368 JS |
456 | /* Ensure abort is called for late-transactional failures */ |
457 | block_job_update_rc(job); | |
10a3fbb0 | 458 | |
c55a832f | 459 | if (!job->ret) { |
43628d93 | 460 | block_job_commit(job); |
c55a832f | 461 | } else { |
43628d93 | 462 | block_job_abort(job); |
e8a40bf7 | 463 | } |
43628d93 | 464 | block_job_clean(job); |
8254b6d9 JS |
465 | |
466 | if (job->cb) { | |
467 | job->cb(job->opaque, job->ret); | |
468 | } | |
5ccac6f1 JS |
469 | |
470 | /* Emit events only if we actually started */ | |
471 | if (block_job_started(job)) { | |
472 | if (block_job_is_cancelled(job)) { | |
473 | block_job_event_cancelled(job); | |
474 | } else { | |
475 | const char *msg = NULL; | |
476 | if (job->ret < 0) { | |
477 | msg = strerror(-job->ret); | |
478 | } | |
479 | block_job_event_completed(job, msg); | |
8254b6d9 | 480 | } |
8254b6d9 JS |
481 | } |
482 | ||
75859b94 JS |
483 | QLIST_REMOVE(job, txn_list); |
484 | block_job_txn_unref(job->txn); | |
e0cf0364 | 485 | block_job_conclude(job); |
2da4617a | 486 | return 0; |
c55a832f FZ |
487 | } |
488 | ||
4c241cf5 PB |
489 | static void block_job_cancel_async(BlockJob *job) |
490 | { | |
491 | if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) { | |
492 | block_job_iostatus_reset(job); | |
493 | } | |
494 | if (job->user_paused) { | |
495 | /* Do not call block_job_enter here, the caller will handle it. */ | |
496 | job->user_paused = false; | |
497 | job->pause_count--; | |
498 | } | |
499 | job->cancelled = true; | |
500 | } | |
501 | ||
5f241594 | 502 | static int block_job_txn_apply(BlockJobTxn *txn, int fn(BlockJob *), bool lock) |
efe4d4b7 JS |
503 | { |
504 | AioContext *ctx; | |
505 | BlockJob *job, *next; | |
2da4617a | 506 | int rc = 0; |
efe4d4b7 JS |
507 | |
508 | QLIST_FOREACH_SAFE(job, &txn->jobs, txn_list, next) { | |
5f241594 JS |
509 | if (lock) { |
510 | ctx = blk_get_aio_context(job->blk); | |
511 | aio_context_acquire(ctx); | |
512 | } | |
2da4617a | 513 | rc = fn(job); |
5f241594 JS |
514 | if (lock) { |
515 | aio_context_release(ctx); | |
516 | } | |
2da4617a JS |
517 | if (rc) { |
518 | break; | |
519 | } | |
efe4d4b7 | 520 | } |
2da4617a | 521 | return rc; |
efe4d4b7 JS |
522 | } |
523 | ||
c8ab5c2d PB |
524 | static int block_job_finish_sync(BlockJob *job, |
525 | void (*finish)(BlockJob *, Error **errp), | |
526 | Error **errp) | |
527 | { | |
528 | Error *local_err = NULL; | |
529 | int ret; | |
530 | ||
531 | assert(blk_bs(job->blk)->job == job); | |
532 | ||
533 | block_job_ref(job); | |
534 | ||
4fb588e9 PB |
535 | if (finish) { |
536 | finish(job, &local_err); | |
537 | } | |
c8ab5c2d PB |
538 | if (local_err) { |
539 | error_propagate(errp, local_err); | |
540 | block_job_unref(job); | |
541 | return -EBUSY; | |
542 | } | |
543 | /* block_job_drain calls block_job_enter, and it should be enough to | |
544 | * induce progress until the job completes or moves to the main thread. | |
545 | */ | |
546 | while (!job->deferred_to_main_loop && !job->completed) { | |
547 | block_job_drain(job); | |
548 | } | |
549 | while (!job->completed) { | |
550 | aio_poll(qemu_get_aio_context(), true); | |
551 | } | |
552 | ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret; | |
553 | block_job_unref(job); | |
554 | return ret; | |
555 | } | |
556 | ||
c55a832f FZ |
557 | static void block_job_completed_txn_abort(BlockJob *job) |
558 | { | |
559 | AioContext *ctx; | |
560 | BlockJobTxn *txn = job->txn; | |
4fb588e9 | 561 | BlockJob *other_job; |
c55a832f FZ |
562 | |
563 | if (txn->aborting) { | |
564 | /* | |
565 | * We are cancelled by another job, which will handle everything. | |
566 | */ | |
567 | return; | |
568 | } | |
569 | txn->aborting = true; | |
4fb588e9 PB |
570 | block_job_txn_ref(txn); |
571 | ||
c55a832f FZ |
572 | /* We are the first failed job. Cancel other jobs. */ |
573 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
b6d2e599 | 574 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
575 | aio_context_acquire(ctx); |
576 | } | |
4fb588e9 PB |
577 | |
578 | /* Other jobs are effectively cancelled by us, set the status for | |
579 | * them; this job, however, may or may not be cancelled, depending | |
580 | * on the caller, so leave it. */ | |
c55a832f | 581 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { |
4fb588e9 PB |
582 | if (other_job != job) { |
583 | block_job_cancel_async(other_job); | |
c55a832f | 584 | } |
c55a832f | 585 | } |
4fb588e9 PB |
586 | while (!QLIST_EMPTY(&txn->jobs)) { |
587 | other_job = QLIST_FIRST(&txn->jobs); | |
b6d2e599 | 588 | ctx = blk_get_aio_context(other_job->blk); |
4fb588e9 PB |
589 | if (!other_job->completed) { |
590 | assert(other_job->cancelled); | |
591 | block_job_finish_sync(other_job, NULL, NULL); | |
592 | } | |
c55a832f FZ |
593 | block_job_completed_single(other_job); |
594 | aio_context_release(ctx); | |
595 | } | |
4fb588e9 PB |
596 | |
597 | block_job_txn_unref(txn); | |
c55a832f FZ |
598 | } |
599 | ||
600 | static void block_job_completed_txn_success(BlockJob *job) | |
601 | { | |
c55a832f | 602 | BlockJobTxn *txn = job->txn; |
efe4d4b7 | 603 | BlockJob *other_job; |
2da4617a JS |
604 | int rc = 0; |
605 | ||
e8af5686 JS |
606 | block_job_state_transition(job, BLOCK_JOB_STATUS_WAITING); |
607 | ||
c55a832f FZ |
608 | /* |
609 | * Successful completion, see if there are other running jobs in this | |
610 | * txn. | |
611 | */ | |
612 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
613 | if (!other_job->completed) { | |
614 | return; | |
615 | } | |
c55a832f | 616 | assert(other_job->ret == 0); |
c55a832f | 617 | } |
2da4617a JS |
618 | |
619 | /* Jobs may require some prep-work to complete without failure */ | |
5f241594 | 620 | rc = block_job_txn_apply(txn, block_job_prepare, true); |
2da4617a JS |
621 | if (rc) { |
622 | block_job_completed_txn_abort(job); | |
623 | return; | |
624 | } | |
625 | ||
efe4d4b7 | 626 | /* We are the last completed job, commit the transaction. */ |
5f241594 JS |
627 | block_job_txn_apply(txn, block_job_event_pending, false); |
628 | block_job_txn_apply(txn, block_job_completed_single, true); | |
c55a832f FZ |
629 | } |
630 | ||
aa9ef2e6 JS |
631 | /* Assumes the block_job_mutex is held */ |
632 | static bool block_job_timer_pending(BlockJob *job) | |
633 | { | |
634 | return timer_pending(&job->sleep_timer); | |
635 | } | |
636 | ||
2f0c9fe6 PB |
637 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
638 | { | |
639 | Error *local_err = NULL; | |
aa9ef2e6 | 640 | int64_t old_speed = job->speed; |
2f0c9fe6 | 641 | |
3fc4b10a | 642 | if (!job->driver->set_speed) { |
c6bd8c70 | 643 | error_setg(errp, QERR_UNSUPPORTED); |
2f0c9fe6 PB |
644 | return; |
645 | } | |
0ec4dfb8 JS |
646 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_SET_SPEED, errp)) { |
647 | return; | |
648 | } | |
3fc4b10a | 649 | job->driver->set_speed(job, speed, &local_err); |
84d18f06 | 650 | if (local_err) { |
2f0c9fe6 PB |
651 | error_propagate(errp, local_err); |
652 | return; | |
653 | } | |
654 | ||
655 | job->speed = speed; | |
d4fce188 | 656 | if (speed && speed <= old_speed) { |
aa9ef2e6 JS |
657 | return; |
658 | } | |
659 | ||
660 | /* kick only if a timer is pending */ | |
661 | block_job_enter_cond(job, block_job_timer_pending); | |
2f0c9fe6 PB |
662 | } |
663 | ||
aeae883b PB |
664 | void block_job_complete(BlockJob *job, Error **errp) |
665 | { | |
559b935f JS |
666 | /* Should not be reachable via external interface for internal jobs */ |
667 | assert(job->id); | |
0ec4dfb8 JS |
668 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_COMPLETE, errp)) { |
669 | return; | |
670 | } | |
671 | if (job->pause_count || job->cancelled || !job->driver->complete) { | |
9df229c3 AG |
672 | error_setg(errp, "The active block job '%s' cannot be completed", |
673 | job->id); | |
aeae883b PB |
674 | return; |
675 | } | |
676 | ||
3fc4b10a | 677 | job->driver->complete(job, errp); |
aeae883b PB |
678 | } |
679 | ||
75f71059 JS |
680 | void block_job_dismiss(BlockJob **jobptr, Error **errp) |
681 | { | |
682 | BlockJob *job = *jobptr; | |
683 | /* similarly to _complete, this is QMP-interface only. */ | |
684 | assert(job->id); | |
685 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_DISMISS, errp)) { | |
686 | return; | |
687 | } | |
688 | ||
689 | block_job_do_dismiss(job); | |
690 | *jobptr = NULL; | |
691 | } | |
692 | ||
0ec4dfb8 | 693 | void block_job_user_pause(BlockJob *job, Error **errp) |
0df4ba58 | 694 | { |
0ec4dfb8 JS |
695 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_PAUSE, errp)) { |
696 | return; | |
697 | } | |
698 | if (job->user_paused) { | |
699 | error_setg(errp, "Job is already paused"); | |
700 | return; | |
701 | } | |
0df4ba58 JS |
702 | job->user_paused = true; |
703 | block_job_pause(job); | |
704 | } | |
705 | ||
0df4ba58 JS |
706 | bool block_job_user_paused(BlockJob *job) |
707 | { | |
6573d9c6 | 708 | return job->user_paused; |
0df4ba58 JS |
709 | } |
710 | ||
0ec4dfb8 | 711 | void block_job_user_resume(BlockJob *job, Error **errp) |
0df4ba58 | 712 | { |
0ec4dfb8 JS |
713 | assert(job); |
714 | if (!job->user_paused || job->pause_count <= 0) { | |
715 | error_setg(errp, "Can't resume a job that was not paused"); | |
716 | return; | |
0df4ba58 | 717 | } |
0ec4dfb8 JS |
718 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_RESUME, errp)) { |
719 | return; | |
720 | } | |
721 | block_job_iostatus_reset(job); | |
722 | job->user_paused = false; | |
723 | block_job_resume(job); | |
0df4ba58 JS |
724 | } |
725 | ||
8acc72a4 PB |
726 | void block_job_cancel(BlockJob *job) |
727 | { | |
e0cf0364 | 728 | if (job->status == BLOCK_JOB_STATUS_CONCLUDED) { |
75f71059 | 729 | block_job_do_dismiss(job); |
e0cf0364 | 730 | } else if (block_job_started(job)) { |
4c241cf5 | 731 | block_job_cancel_async(job); |
5ccac6f1 JS |
732 | block_job_enter(job); |
733 | } else { | |
734 | block_job_completed(job, -ECANCELED); | |
735 | } | |
8acc72a4 PB |
736 | } |
737 | ||
0ec4dfb8 JS |
738 | void block_job_user_cancel(BlockJob *job, Error **errp) |
739 | { | |
740 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_CANCEL, errp)) { | |
741 | return; | |
742 | } | |
743 | block_job_cancel(job); | |
744 | } | |
745 | ||
345f9e1b HR |
746 | /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be |
747 | * used with block_job_finish_sync() without the need for (rather nasty) | |
748 | * function pointer casts there. */ | |
749 | static void block_job_cancel_err(BlockJob *job, Error **errp) | |
750 | { | |
751 | block_job_cancel(job); | |
752 | } | |
753 | ||
754 | int block_job_cancel_sync(BlockJob *job) | |
755 | { | |
756 | return block_job_finish_sync(job, &block_job_cancel_err, NULL); | |
757 | } | |
758 | ||
a1a2af07 KW |
759 | void block_job_cancel_sync_all(void) |
760 | { | |
761 | BlockJob *job; | |
762 | AioContext *aio_context; | |
763 | ||
764 | while ((job = QLIST_FIRST(&block_jobs))) { | |
b6d2e599 | 765 | aio_context = blk_get_aio_context(job->blk); |
a1a2af07 KW |
766 | aio_context_acquire(aio_context); |
767 | block_job_cancel_sync(job); | |
768 | aio_context_release(aio_context); | |
769 | } | |
770 | } | |
771 | ||
345f9e1b HR |
772 | int block_job_complete_sync(BlockJob *job, Error **errp) |
773 | { | |
774 | return block_job_finish_sync(job, &block_job_complete, errp); | |
775 | } | |
776 | ||
559b935f | 777 | BlockJobInfo *block_job_query(BlockJob *job, Error **errp) |
30e628b7 | 778 | { |
559b935f JS |
779 | BlockJobInfo *info; |
780 | ||
781 | if (block_job_is_internal(job)) { | |
782 | error_setg(errp, "Cannot query QEMU internal jobs"); | |
783 | return NULL; | |
784 | } | |
785 | info = g_new0(BlockJobInfo, 1); | |
977c736f | 786 | info->type = g_strdup(BlockJobType_str(job->driver->job_type)); |
8ccb9569 | 787 | info->device = g_strdup(job->id); |
32c81a4a | 788 | info->len = job->len; |
fc24908e | 789 | info->busy = atomic_read(&job->busy); |
751ebd76 | 790 | info->paused = job->pause_count > 0; |
32c81a4a PB |
791 | info->offset = job->offset; |
792 | info->speed = job->speed; | |
793 | info->io_status = job->iostatus; | |
ef6dbf1e | 794 | info->ready = job->ready; |
58b295ba | 795 | info->status = job->status; |
30e628b7 PB |
796 | return info; |
797 | } | |
32c81a4a PB |
798 | |
799 | static void block_job_iostatus_set_err(BlockJob *job, int error) | |
800 | { | |
801 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
802 | job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
803 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
804 | } | |
805 | } | |
806 | ||
8254b6d9 | 807 | static void block_job_event_cancelled(BlockJob *job) |
bcada37b | 808 | { |
559b935f JS |
809 | if (block_job_is_internal(job)) { |
810 | return; | |
811 | } | |
812 | ||
bcada37b | 813 | qapi_event_send_block_job_cancelled(job->driver->job_type, |
8ccb9569 | 814 | job->id, |
bcada37b WX |
815 | job->len, |
816 | job->offset, | |
817 | job->speed, | |
818 | &error_abort); | |
819 | } | |
32c81a4a | 820 | |
8254b6d9 | 821 | static void block_job_event_completed(BlockJob *job, const char *msg) |
a66a2a36 | 822 | { |
559b935f JS |
823 | if (block_job_is_internal(job)) { |
824 | return; | |
825 | } | |
826 | ||
bcada37b | 827 | qapi_event_send_block_job_completed(job->driver->job_type, |
8ccb9569 | 828 | job->id, |
bcada37b WX |
829 | job->len, |
830 | job->offset, | |
831 | job->speed, | |
832 | !!msg, | |
833 | msg, | |
834 | &error_abort); | |
a66a2a36 PB |
835 | } |
836 | ||
5f241594 JS |
837 | static int block_job_event_pending(BlockJob *job) |
838 | { | |
839 | block_job_state_transition(job, BLOCK_JOB_STATUS_PENDING); | |
840 | if (!job->auto_finalize && !block_job_is_internal(job)) { | |
841 | qapi_event_send_block_job_pending(job->driver->job_type, | |
842 | job->id, | |
843 | &error_abort); | |
844 | } | |
845 | return 0; | |
846 | } | |
847 | ||
88691b37 PB |
848 | /* |
849 | * API for block job drivers and the block layer. These functions are | |
850 | * declared in blockjob_int.h. | |
851 | */ | |
852 | ||
853 | void *block_job_create(const char *job_id, const BlockJobDriver *driver, | |
75859b94 | 854 | BlockJobTxn *txn, BlockDriverState *bs, uint64_t perm, |
88691b37 PB |
855 | uint64_t shared_perm, int64_t speed, int flags, |
856 | BlockCompletionFunc *cb, void *opaque, Error **errp) | |
857 | { | |
858 | BlockBackend *blk; | |
859 | BlockJob *job; | |
860 | int ret; | |
861 | ||
862 | if (bs->job) { | |
863 | error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); | |
864 | return NULL; | |
865 | } | |
866 | ||
867 | if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) { | |
868 | job_id = bdrv_get_device_name(bs); | |
869 | if (!*job_id) { | |
870 | error_setg(errp, "An explicit job ID is required for this node"); | |
871 | return NULL; | |
872 | } | |
873 | } | |
874 | ||
875 | if (job_id) { | |
876 | if (flags & BLOCK_JOB_INTERNAL) { | |
877 | error_setg(errp, "Cannot specify job ID for internal block job"); | |
878 | return NULL; | |
879 | } | |
880 | ||
881 | if (!id_wellformed(job_id)) { | |
882 | error_setg(errp, "Invalid job ID '%s'", job_id); | |
883 | return NULL; | |
884 | } | |
885 | ||
886 | if (block_job_get(job_id)) { | |
887 | error_setg(errp, "Job ID '%s' already in use", job_id); | |
888 | return NULL; | |
889 | } | |
890 | } | |
891 | ||
892 | blk = blk_new(perm, shared_perm); | |
893 | ret = blk_insert_bs(blk, bs, errp); | |
894 | if (ret < 0) { | |
895 | blk_unref(blk); | |
896 | return NULL; | |
897 | } | |
898 | ||
899 | job = g_malloc0(driver->instance_size); | |
900 | job->driver = driver; | |
901 | job->id = g_strdup(job_id); | |
902 | job->blk = blk; | |
903 | job->cb = cb; | |
904 | job->opaque = opaque; | |
905 | job->busy = false; | |
906 | job->paused = true; | |
907 | job->pause_count = 1; | |
908 | job->refcnt = 1; | |
5f241594 | 909 | job->auto_finalize = !(flags & BLOCK_JOB_MANUAL_FINALIZE); |
75f71059 | 910 | job->auto_dismiss = !(flags & BLOCK_JOB_MANUAL_DISMISS); |
c9de4050 | 911 | block_job_state_transition(job, BLOCK_JOB_STATUS_CREATED); |
fc24908e PB |
912 | aio_timer_init(qemu_get_aio_context(), &job->sleep_timer, |
913 | QEMU_CLOCK_REALTIME, SCALE_NS, | |
914 | block_job_sleep_timer_cb, job); | |
88691b37 PB |
915 | |
916 | error_setg(&job->blocker, "block device is in use by block job: %s", | |
977c736f | 917 | BlockJobType_str(driver->job_type)); |
88691b37 PB |
918 | block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort); |
919 | bs->job = job; | |
920 | ||
88691b37 PB |
921 | bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); |
922 | ||
923 | QLIST_INSERT_HEAD(&block_jobs, job, job_list); | |
924 | ||
925 | blk_add_aio_context_notifier(blk, block_job_attached_aio_context, | |
926 | block_job_detach_aio_context, job); | |
927 | ||
928 | /* Only set speed when necessary to avoid NotSupported error */ | |
929 | if (speed != 0) { | |
930 | Error *local_err = NULL; | |
931 | ||
932 | block_job_set_speed(job, speed, &local_err); | |
933 | if (local_err) { | |
3925cd3b | 934 | block_job_early_fail(job); |
88691b37 PB |
935 | error_propagate(errp, local_err); |
936 | return NULL; | |
937 | } | |
938 | } | |
75859b94 JS |
939 | |
940 | /* Single jobs are modeled as single-job transactions for sake of | |
941 | * consolidating the job management logic */ | |
942 | if (!txn) { | |
943 | txn = block_job_txn_new(); | |
944 | block_job_txn_add_job(txn, job); | |
945 | block_job_txn_unref(txn); | |
946 | } else { | |
947 | block_job_txn_add_job(txn, job); | |
948 | } | |
949 | ||
88691b37 PB |
950 | return job; |
951 | } | |
952 | ||
f321dcb5 PB |
953 | void block_job_pause_all(void) |
954 | { | |
955 | BlockJob *job = NULL; | |
956 | while ((job = block_job_next(job))) { | |
957 | AioContext *aio_context = blk_get_aio_context(job->blk); | |
958 | ||
959 | aio_context_acquire(aio_context); | |
3d5d319e | 960 | block_job_ref(job); |
f321dcb5 PB |
961 | block_job_pause(job); |
962 | aio_context_release(aio_context); | |
963 | } | |
964 | } | |
965 | ||
88691b37 PB |
966 | void block_job_early_fail(BlockJob *job) |
967 | { | |
3925cd3b JS |
968 | assert(job->status == BLOCK_JOB_STATUS_CREATED); |
969 | block_job_decommission(job); | |
88691b37 PB |
970 | } |
971 | ||
972 | void block_job_completed(BlockJob *job, int ret) | |
973 | { | |
75859b94 | 974 | assert(job && job->txn && !job->completed); |
88691b37 | 975 | assert(blk_bs(job->blk)->job == job); |
88691b37 PB |
976 | job->completed = true; |
977 | job->ret = ret; | |
35d6b368 JS |
978 | block_job_update_rc(job); |
979 | trace_block_job_completed(job, ret, job->ret); | |
980 | if (job->ret) { | |
88691b37 PB |
981 | block_job_completed_txn_abort(job); |
982 | } else { | |
983 | block_job_completed_txn_success(job); | |
984 | } | |
985 | } | |
986 | ||
987 | static bool block_job_should_pause(BlockJob *job) | |
988 | { | |
989 | return job->pause_count > 0; | |
990 | } | |
991 | ||
fc24908e PB |
992 | /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds. |
993 | * Reentering the job coroutine with block_job_enter() before the timer has | |
994 | * expired is allowed and cancels the timer. | |
995 | * | |
996 | * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be | |
997 | * called explicitly. */ | |
998 | static void block_job_do_yield(BlockJob *job, uint64_t ns) | |
356f59b8 | 999 | { |
fc24908e PB |
1000 | block_job_lock(); |
1001 | if (ns != -1) { | |
1002 | timer_mod(&job->sleep_timer, ns); | |
1003 | } | |
356f59b8 | 1004 | job->busy = false; |
fc24908e | 1005 | block_job_unlock(); |
356f59b8 PB |
1006 | qemu_coroutine_yield(); |
1007 | ||
1008 | /* Set by block_job_enter before re-entering the coroutine. */ | |
1009 | assert(job->busy); | |
1010 | } | |
1011 | ||
88691b37 PB |
1012 | void coroutine_fn block_job_pause_point(BlockJob *job) |
1013 | { | |
1014 | assert(job && block_job_started(job)); | |
1015 | ||
1016 | if (!block_job_should_pause(job)) { | |
1017 | return; | |
1018 | } | |
1019 | if (block_job_is_cancelled(job)) { | |
1020 | return; | |
1021 | } | |
1022 | ||
1023 | if (job->driver->pause) { | |
1024 | job->driver->pause(job); | |
1025 | } | |
1026 | ||
1027 | if (block_job_should_pause(job) && !block_job_is_cancelled(job)) { | |
58b295ba | 1028 | BlockJobStatus status = job->status; |
c9de4050 JS |
1029 | block_job_state_transition(job, status == BLOCK_JOB_STATUS_READY ? \ |
1030 | BLOCK_JOB_STATUS_STANDBY : \ | |
1031 | BLOCK_JOB_STATUS_PAUSED); | |
88691b37 | 1032 | job->paused = true; |
fc24908e | 1033 | block_job_do_yield(job, -1); |
88691b37 | 1034 | job->paused = false; |
c9de4050 | 1035 | block_job_state_transition(job, status); |
88691b37 PB |
1036 | } |
1037 | ||
1038 | if (job->driver->resume) { | |
1039 | job->driver->resume(job); | |
1040 | } | |
1041 | } | |
1042 | ||
f321dcb5 PB |
1043 | void block_job_resume_all(void) |
1044 | { | |
3d5d319e AG |
1045 | BlockJob *job, *next; |
1046 | ||
1047 | QLIST_FOREACH_SAFE(job, &block_jobs, job_list, next) { | |
f321dcb5 PB |
1048 | AioContext *aio_context = blk_get_aio_context(job->blk); |
1049 | ||
1050 | aio_context_acquire(aio_context); | |
1051 | block_job_resume(job); | |
3d5d319e | 1052 | block_job_unref(job); |
f321dcb5 PB |
1053 | aio_context_release(aio_context); |
1054 | } | |
1055 | } | |
1056 | ||
aa9ef2e6 JS |
1057 | /* |
1058 | * Conditionally enter a block_job pending a call to fn() while | |
1059 | * under the block_job_lock critical section. | |
1060 | */ | |
1061 | static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job)) | |
88691b37 | 1062 | { |
eb05e011 PB |
1063 | if (!block_job_started(job)) { |
1064 | return; | |
1065 | } | |
1066 | if (job->deferred_to_main_loop) { | |
1067 | return; | |
1068 | } | |
1069 | ||
fc24908e | 1070 | block_job_lock(); |
356f59b8 | 1071 | if (job->busy) { |
fc24908e | 1072 | block_job_unlock(); |
356f59b8 | 1073 | return; |
88691b37 | 1074 | } |
356f59b8 | 1075 | |
aa9ef2e6 JS |
1076 | if (fn && !fn(job)) { |
1077 | block_job_unlock(); | |
1078 | return; | |
1079 | } | |
1080 | ||
fc24908e PB |
1081 | assert(!job->deferred_to_main_loop); |
1082 | timer_del(&job->sleep_timer); | |
356f59b8 | 1083 | job->busy = true; |
fc24908e | 1084 | block_job_unlock(); |
356f59b8 | 1085 | aio_co_wake(job->co); |
88691b37 PB |
1086 | } |
1087 | ||
aa9ef2e6 JS |
1088 | void block_job_enter(BlockJob *job) |
1089 | { | |
1090 | block_job_enter_cond(job, NULL); | |
1091 | } | |
1092 | ||
88691b37 PB |
1093 | bool block_job_is_cancelled(BlockJob *job) |
1094 | { | |
1095 | return job->cancelled; | |
1096 | } | |
1097 | ||
5bf1d5a7 | 1098 | void block_job_sleep_ns(BlockJob *job, int64_t ns) |
88691b37 PB |
1099 | { |
1100 | assert(job->busy); | |
1101 | ||
1102 | /* Check cancellation *before* setting busy = false, too! */ | |
1103 | if (block_job_is_cancelled(job)) { | |
1104 | return; | |
1105 | } | |
1106 | ||
88691b37 | 1107 | if (!block_job_should_pause(job)) { |
fc24908e | 1108 | block_job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns); |
88691b37 | 1109 | } |
88691b37 PB |
1110 | |
1111 | block_job_pause_point(job); | |
1112 | } | |
1113 | ||
1114 | void block_job_yield(BlockJob *job) | |
1115 | { | |
1116 | assert(job->busy); | |
1117 | ||
1118 | /* Check cancellation *before* setting busy = false, too! */ | |
1119 | if (block_job_is_cancelled(job)) { | |
1120 | return; | |
1121 | } | |
1122 | ||
88691b37 | 1123 | if (!block_job_should_pause(job)) { |
fc24908e | 1124 | block_job_do_yield(job, -1); |
88691b37 | 1125 | } |
88691b37 PB |
1126 | |
1127 | block_job_pause_point(job); | |
1128 | } | |
1129 | ||
2caf63a9 PB |
1130 | void block_job_iostatus_reset(BlockJob *job) |
1131 | { | |
4c241cf5 PB |
1132 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
1133 | return; | |
1134 | } | |
1135 | assert(job->user_paused && job->pause_count > 0); | |
2caf63a9 PB |
1136 | job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
1137 | } | |
1138 | ||
bcada37b | 1139 | void block_job_event_ready(BlockJob *job) |
a66a2a36 | 1140 | { |
c9de4050 | 1141 | block_job_state_transition(job, BLOCK_JOB_STATUS_READY); |
ef6dbf1e HR |
1142 | job->ready = true; |
1143 | ||
559b935f JS |
1144 | if (block_job_is_internal(job)) { |
1145 | return; | |
1146 | } | |
1147 | ||
518848a2 | 1148 | qapi_event_send_block_job_ready(job->driver->job_type, |
8ccb9569 | 1149 | job->id, |
518848a2 MA |
1150 | job->len, |
1151 | job->offset, | |
1152 | job->speed, &error_abort); | |
a66a2a36 PB |
1153 | } |
1154 | ||
81e254dc | 1155 | BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err, |
32c81a4a PB |
1156 | int is_read, int error) |
1157 | { | |
1158 | BlockErrorAction action; | |
1159 | ||
1160 | switch (on_err) { | |
1161 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
8c398252 | 1162 | case BLOCKDEV_ON_ERROR_AUTO: |
a589569f WX |
1163 | action = (error == ENOSPC) ? |
1164 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
32c81a4a PB |
1165 | break; |
1166 | case BLOCKDEV_ON_ERROR_STOP: | |
a589569f | 1167 | action = BLOCK_ERROR_ACTION_STOP; |
32c81a4a PB |
1168 | break; |
1169 | case BLOCKDEV_ON_ERROR_REPORT: | |
a589569f | 1170 | action = BLOCK_ERROR_ACTION_REPORT; |
32c81a4a PB |
1171 | break; |
1172 | case BLOCKDEV_ON_ERROR_IGNORE: | |
a589569f | 1173 | action = BLOCK_ERROR_ACTION_IGNORE; |
32c81a4a PB |
1174 | break; |
1175 | default: | |
1176 | abort(); | |
1177 | } | |
559b935f JS |
1178 | if (!block_job_is_internal(job)) { |
1179 | qapi_event_send_block_job_error(job->id, | |
1180 | is_read ? IO_OPERATION_TYPE_READ : | |
1181 | IO_OPERATION_TYPE_WRITE, | |
1182 | action, &error_abort); | |
1183 | } | |
a589569f | 1184 | if (action == BLOCK_ERROR_ACTION_STOP) { |
0ec4dfb8 | 1185 | block_job_pause(job); |
751ebd76 | 1186 | /* make the pause user visible, which will be resumed from QMP. */ |
0ec4dfb8 | 1187 | job->user_paused = true; |
32c81a4a | 1188 | block_job_iostatus_set_err(job, error); |
32c81a4a PB |
1189 | } |
1190 | return action; | |
1191 | } | |
dec7d421 SH |
1192 | |
1193 | typedef struct { | |
1194 | BlockJob *job; | |
dec7d421 SH |
1195 | AioContext *aio_context; |
1196 | BlockJobDeferToMainLoopFn *fn; | |
1197 | void *opaque; | |
1198 | } BlockJobDeferToMainLoopData; | |
1199 | ||
1200 | static void block_job_defer_to_main_loop_bh(void *opaque) | |
1201 | { | |
1202 | BlockJobDeferToMainLoopData *data = opaque; | |
1203 | AioContext *aio_context; | |
1204 | ||
dec7d421 SH |
1205 | /* Prevent race with block_job_defer_to_main_loop() */ |
1206 | aio_context_acquire(data->aio_context); | |
1207 | ||
1208 | /* Fetch BDS AioContext again, in case it has changed */ | |
b6d2e599 | 1209 | aio_context = blk_get_aio_context(data->job->blk); |
d79df2a2 PB |
1210 | if (aio_context != data->aio_context) { |
1211 | aio_context_acquire(aio_context); | |
1212 | } | |
dec7d421 SH |
1213 | |
1214 | data->fn(data->job, data->opaque); | |
1215 | ||
d79df2a2 PB |
1216 | if (aio_context != data->aio_context) { |
1217 | aio_context_release(aio_context); | |
1218 | } | |
dec7d421 SH |
1219 | |
1220 | aio_context_release(data->aio_context); | |
1221 | ||
1222 | g_free(data); | |
1223 | } | |
1224 | ||
1225 | void block_job_defer_to_main_loop(BlockJob *job, | |
1226 | BlockJobDeferToMainLoopFn *fn, | |
1227 | void *opaque) | |
1228 | { | |
1229 | BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); | |
1230 | data->job = job; | |
b6d2e599 | 1231 | data->aio_context = blk_get_aio_context(job->blk); |
dec7d421 SH |
1232 | data->fn = fn; |
1233 | data->opaque = opaque; | |
794f0141 | 1234 | job->deferred_to_main_loop = true; |
dec7d421 | 1235 | |
fffb6e12 PB |
1236 | aio_bh_schedule_oneshot(qemu_get_aio_context(), |
1237 | block_job_defer_to_main_loop_bh, data); | |
dec7d421 | 1238 | } |