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2f0c9fe6 PB |
1 | /* |
2 | * QEMU System Emulator block driver | |
3 | * | |
4 | * Copyright (c) 2011 IBM Corp. | |
5 | * Copyright (c) 2012 Red Hat, Inc. | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
25 | ||
d38ea87a | 26 | #include "qemu/osdep.h" |
2f0c9fe6 PB |
27 | #include "qemu-common.h" |
28 | #include "trace.h" | |
737e150e PB |
29 | #include "block/block.h" |
30 | #include "block/blockjob.h" | |
31 | #include "block/block_int.h" | |
373340b2 | 32 | #include "sysemu/block-backend.h" |
cc7a8ea7 | 33 | #include "qapi/qmp/qerror.h" |
7b1b5d19 | 34 | #include "qapi/qmp/qjson.h" |
10817bf0 | 35 | #include "qemu/coroutine.h" |
2f0c9fe6 | 36 | #include "qmp-commands.h" |
1de7afc9 | 37 | #include "qemu/timer.h" |
5a2d2cbd | 38 | #include "qapi-event.h" |
2f0c9fe6 | 39 | |
c55a832f FZ |
40 | /* Transactional group of block jobs */ |
41 | struct BlockJobTxn { | |
42 | ||
43 | /* Is this txn being cancelled? */ | |
44 | bool aborting; | |
45 | ||
46 | /* List of jobs */ | |
47 | QLIST_HEAD(, BlockJob) jobs; | |
48 | ||
49 | /* Reference count */ | |
50 | int refcnt; | |
51 | }; | |
52 | ||
a7112795 AG |
53 | static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs); |
54 | ||
55 | BlockJob *block_job_next(BlockJob *job) | |
56 | { | |
57 | if (!job) { | |
58 | return QLIST_FIRST(&block_jobs); | |
59 | } | |
60 | return QLIST_NEXT(job, job_list); | |
61 | } | |
62 | ||
3fc4b10a | 63 | void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs, |
097310b5 | 64 | int64_t speed, BlockCompletionFunc *cb, |
2f0c9fe6 PB |
65 | void *opaque, Error **errp) |
66 | { | |
67 | BlockJob *job; | |
68 | ||
628ff683 | 69 | if (bs->job) { |
c6bd8c70 | 70 | error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); |
2f0c9fe6 PB |
71 | return NULL; |
72 | } | |
fa510ebf | 73 | bdrv_ref(bs); |
3fc4b10a | 74 | job = g_malloc0(driver->instance_size); |
3718d8ab FZ |
75 | error_setg(&job->blocker, "block device is in use by block job: %s", |
76 | BlockJobType_lookup[driver->job_type]); | |
77 | bdrv_op_block_all(bs, job->blocker); | |
b112a65c | 78 | bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); |
3718d8ab | 79 | |
3fc4b10a | 80 | job->driver = driver; |
8ccb9569 | 81 | job->id = g_strdup(bdrv_get_device_name(bs)); |
2f0c9fe6 PB |
82 | job->bs = bs; |
83 | job->cb = cb; | |
84 | job->opaque = opaque; | |
85 | job->busy = true; | |
18930ba3 | 86 | job->refcnt = 1; |
2f0c9fe6 PB |
87 | bs->job = job; |
88 | ||
a7112795 AG |
89 | QLIST_INSERT_HEAD(&block_jobs, job, job_list); |
90 | ||
2f0c9fe6 PB |
91 | /* Only set speed when necessary to avoid NotSupported error */ |
92 | if (speed != 0) { | |
93 | Error *local_err = NULL; | |
94 | ||
95 | block_job_set_speed(job, speed, &local_err); | |
84d18f06 | 96 | if (local_err) { |
18930ba3 | 97 | block_job_unref(job); |
2f0c9fe6 PB |
98 | error_propagate(errp, local_err); |
99 | return NULL; | |
100 | } | |
101 | } | |
102 | return job; | |
103 | } | |
104 | ||
18930ba3 | 105 | void block_job_ref(BlockJob *job) |
2f0c9fe6 | 106 | { |
18930ba3 FZ |
107 | ++job->refcnt; |
108 | } | |
2f0c9fe6 | 109 | |
18930ba3 FZ |
110 | void block_job_unref(BlockJob *job) |
111 | { | |
112 | if (--job->refcnt == 0) { | |
113 | job->bs->job = NULL; | |
114 | bdrv_op_unblock_all(job->bs, job->blocker); | |
115 | bdrv_unref(job->bs); | |
116 | error_free(job->blocker); | |
117 | g_free(job->id); | |
a7112795 | 118 | QLIST_REMOVE(job, job_list); |
18930ba3 FZ |
119 | g_free(job); |
120 | } | |
2f0c9fe6 PB |
121 | } |
122 | ||
c55a832f FZ |
123 | static void block_job_completed_single(BlockJob *job) |
124 | { | |
125 | if (!job->ret) { | |
126 | if (job->driver->commit) { | |
127 | job->driver->commit(job); | |
128 | } | |
129 | } else { | |
130 | if (job->driver->abort) { | |
131 | job->driver->abort(job); | |
132 | } | |
133 | } | |
134 | job->cb(job->opaque, job->ret); | |
135 | if (job->txn) { | |
136 | block_job_txn_unref(job->txn); | |
137 | } | |
138 | block_job_unref(job); | |
139 | } | |
140 | ||
141 | static void block_job_completed_txn_abort(BlockJob *job) | |
142 | { | |
143 | AioContext *ctx; | |
144 | BlockJobTxn *txn = job->txn; | |
145 | BlockJob *other_job, *next; | |
146 | ||
147 | if (txn->aborting) { | |
148 | /* | |
149 | * We are cancelled by another job, which will handle everything. | |
150 | */ | |
151 | return; | |
152 | } | |
153 | txn->aborting = true; | |
154 | /* We are the first failed job. Cancel other jobs. */ | |
155 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
156 | ctx = bdrv_get_aio_context(other_job->bs); | |
157 | aio_context_acquire(ctx); | |
158 | } | |
159 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
160 | if (other_job == job || other_job->completed) { | |
161 | /* Other jobs are "effectively" cancelled by us, set the status for | |
162 | * them; this job, however, may or may not be cancelled, depending | |
163 | * on the caller, so leave it. */ | |
164 | if (other_job != job) { | |
165 | other_job->cancelled = true; | |
166 | } | |
167 | continue; | |
168 | } | |
169 | block_job_cancel_sync(other_job); | |
170 | assert(other_job->completed); | |
171 | } | |
172 | QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { | |
173 | ctx = bdrv_get_aio_context(other_job->bs); | |
174 | block_job_completed_single(other_job); | |
175 | aio_context_release(ctx); | |
176 | } | |
177 | } | |
178 | ||
179 | static void block_job_completed_txn_success(BlockJob *job) | |
180 | { | |
181 | AioContext *ctx; | |
182 | BlockJobTxn *txn = job->txn; | |
183 | BlockJob *other_job, *next; | |
184 | /* | |
185 | * Successful completion, see if there are other running jobs in this | |
186 | * txn. | |
187 | */ | |
188 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
189 | if (!other_job->completed) { | |
190 | return; | |
191 | } | |
192 | } | |
193 | /* We are the last completed job, commit the transaction. */ | |
194 | QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { | |
195 | ctx = bdrv_get_aio_context(other_job->bs); | |
196 | aio_context_acquire(ctx); | |
197 | assert(other_job->ret == 0); | |
198 | block_job_completed_single(other_job); | |
199 | aio_context_release(ctx); | |
200 | } | |
201 | } | |
202 | ||
97031164 TW |
203 | void block_job_completed(BlockJob *job, int ret) |
204 | { | |
205 | BlockDriverState *bs = job->bs; | |
206 | ||
207 | assert(bs->job == job); | |
a689dbf2 FZ |
208 | assert(!job->completed); |
209 | job->completed = true; | |
210 | job->ret = ret; | |
c55a832f FZ |
211 | if (!job->txn) { |
212 | block_job_completed_single(job); | |
213 | } else if (ret < 0 || block_job_is_cancelled(job)) { | |
214 | block_job_completed_txn_abort(job); | |
215 | } else { | |
216 | block_job_completed_txn_success(job); | |
217 | } | |
97031164 TW |
218 | } |
219 | ||
2f0c9fe6 PB |
220 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
221 | { | |
222 | Error *local_err = NULL; | |
223 | ||
3fc4b10a | 224 | if (!job->driver->set_speed) { |
c6bd8c70 | 225 | error_setg(errp, QERR_UNSUPPORTED); |
2f0c9fe6 PB |
226 | return; |
227 | } | |
3fc4b10a | 228 | job->driver->set_speed(job, speed, &local_err); |
84d18f06 | 229 | if (local_err) { |
2f0c9fe6 PB |
230 | error_propagate(errp, local_err); |
231 | return; | |
232 | } | |
233 | ||
234 | job->speed = speed; | |
235 | } | |
236 | ||
aeae883b PB |
237 | void block_job_complete(BlockJob *job, Error **errp) |
238 | { | |
751ebd76 | 239 | if (job->pause_count || job->cancelled || !job->driver->complete) { |
8ccb9569 | 240 | error_setg(errp, QERR_BLOCK_JOB_NOT_READY, job->id); |
aeae883b PB |
241 | return; |
242 | } | |
243 | ||
3fc4b10a | 244 | job->driver->complete(job, errp); |
aeae883b PB |
245 | } |
246 | ||
8acc72a4 | 247 | void block_job_pause(BlockJob *job) |
2f0c9fe6 | 248 | { |
751ebd76 | 249 | job->pause_count++; |
8acc72a4 PB |
250 | } |
251 | ||
252 | bool block_job_is_paused(BlockJob *job) | |
253 | { | |
751ebd76 | 254 | return job->pause_count > 0; |
8acc72a4 PB |
255 | } |
256 | ||
257 | void block_job_resume(BlockJob *job) | |
258 | { | |
751ebd76 FZ |
259 | assert(job->pause_count > 0); |
260 | job->pause_count--; | |
261 | if (job->pause_count) { | |
262 | return; | |
263 | } | |
264 | block_job_enter(job); | |
265 | } | |
266 | ||
267 | void block_job_enter(BlockJob *job) | |
268 | { | |
32c81a4a | 269 | block_job_iostatus_reset(job); |
2f0c9fe6 PB |
270 | if (job->co && !job->busy) { |
271 | qemu_coroutine_enter(job->co, NULL); | |
272 | } | |
273 | } | |
274 | ||
8acc72a4 PB |
275 | void block_job_cancel(BlockJob *job) |
276 | { | |
277 | job->cancelled = true; | |
751ebd76 | 278 | block_job_enter(job); |
8acc72a4 PB |
279 | } |
280 | ||
2f0c9fe6 PB |
281 | bool block_job_is_cancelled(BlockJob *job) |
282 | { | |
283 | return job->cancelled; | |
284 | } | |
285 | ||
32c81a4a PB |
286 | void block_job_iostatus_reset(BlockJob *job) |
287 | { | |
288 | job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
3fc4b10a FZ |
289 | if (job->driver->iostatus_reset) { |
290 | job->driver->iostatus_reset(job); | |
3bd293c3 | 291 | } |
32c81a4a PB |
292 | } |
293 | ||
345f9e1b HR |
294 | static int block_job_finish_sync(BlockJob *job, |
295 | void (*finish)(BlockJob *, Error **errp), | |
296 | Error **errp) | |
2f0c9fe6 | 297 | { |
2f0c9fe6 | 298 | BlockDriverState *bs = job->bs; |
345f9e1b | 299 | Error *local_err = NULL; |
94db6d2d | 300 | int ret; |
2f0c9fe6 PB |
301 | |
302 | assert(bs->job == job); | |
303 | ||
94db6d2d | 304 | block_job_ref(job); |
345f9e1b HR |
305 | finish(job, &local_err); |
306 | if (local_err) { | |
307 | error_propagate(errp, local_err); | |
94db6d2d | 308 | block_job_unref(job); |
345f9e1b HR |
309 | return -EBUSY; |
310 | } | |
94db6d2d | 311 | while (!job->completed) { |
794f0141 FZ |
312 | aio_poll(job->deferred_to_main_loop ? qemu_get_aio_context() : |
313 | bdrv_get_aio_context(bs), | |
314 | true); | |
2f0c9fe6 | 315 | } |
94db6d2d FZ |
316 | ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret; |
317 | block_job_unref(job); | |
318 | return ret; | |
2f0c9fe6 PB |
319 | } |
320 | ||
345f9e1b HR |
321 | /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be |
322 | * used with block_job_finish_sync() without the need for (rather nasty) | |
323 | * function pointer casts there. */ | |
324 | static void block_job_cancel_err(BlockJob *job, Error **errp) | |
325 | { | |
326 | block_job_cancel(job); | |
327 | } | |
328 | ||
329 | int block_job_cancel_sync(BlockJob *job) | |
330 | { | |
331 | return block_job_finish_sync(job, &block_job_cancel_err, NULL); | |
332 | } | |
333 | ||
a1a2af07 KW |
334 | void block_job_cancel_sync_all(void) |
335 | { | |
336 | BlockJob *job; | |
337 | AioContext *aio_context; | |
338 | ||
339 | while ((job = QLIST_FIRST(&block_jobs))) { | |
340 | aio_context = bdrv_get_aio_context(job->bs); | |
341 | aio_context_acquire(aio_context); | |
342 | block_job_cancel_sync(job); | |
343 | aio_context_release(aio_context); | |
344 | } | |
345 | } | |
346 | ||
345f9e1b HR |
347 | int block_job_complete_sync(BlockJob *job, Error **errp) |
348 | { | |
349 | return block_job_finish_sync(job, &block_job_complete, errp); | |
350 | } | |
351 | ||
7483d1e5 | 352 | void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns) |
2f0c9fe6 | 353 | { |
8acc72a4 PB |
354 | assert(job->busy); |
355 | ||
2f0c9fe6 | 356 | /* Check cancellation *before* setting busy = false, too! */ |
8acc72a4 PB |
357 | if (block_job_is_cancelled(job)) { |
358 | return; | |
359 | } | |
360 | ||
361 | job->busy = false; | |
362 | if (block_job_is_paused(job)) { | |
363 | qemu_coroutine_yield(); | |
364 | } else { | |
0b9caf9b | 365 | co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns); |
2f0c9fe6 | 366 | } |
8acc72a4 | 367 | job->busy = true; |
2f0c9fe6 | 368 | } |
30e628b7 | 369 | |
dc71ce45 FZ |
370 | void block_job_yield(BlockJob *job) |
371 | { | |
372 | assert(job->busy); | |
373 | ||
374 | /* Check cancellation *before* setting busy = false, too! */ | |
375 | if (block_job_is_cancelled(job)) { | |
376 | return; | |
377 | } | |
378 | ||
379 | job->busy = false; | |
380 | qemu_coroutine_yield(); | |
381 | job->busy = true; | |
382 | } | |
383 | ||
30e628b7 PB |
384 | BlockJobInfo *block_job_query(BlockJob *job) |
385 | { | |
386 | BlockJobInfo *info = g_new0(BlockJobInfo, 1); | |
79e14bf7 | 387 | info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]); |
8ccb9569 | 388 | info->device = g_strdup(job->id); |
32c81a4a PB |
389 | info->len = job->len; |
390 | info->busy = job->busy; | |
751ebd76 | 391 | info->paused = job->pause_count > 0; |
32c81a4a PB |
392 | info->offset = job->offset; |
393 | info->speed = job->speed; | |
394 | info->io_status = job->iostatus; | |
ef6dbf1e | 395 | info->ready = job->ready; |
30e628b7 PB |
396 | return info; |
397 | } | |
32c81a4a PB |
398 | |
399 | static void block_job_iostatus_set_err(BlockJob *job, int error) | |
400 | { | |
401 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
402 | job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
403 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
404 | } | |
405 | } | |
406 | ||
bcada37b WX |
407 | void block_job_event_cancelled(BlockJob *job) |
408 | { | |
409 | qapi_event_send_block_job_cancelled(job->driver->job_type, | |
8ccb9569 | 410 | job->id, |
bcada37b WX |
411 | job->len, |
412 | job->offset, | |
413 | job->speed, | |
414 | &error_abort); | |
415 | } | |
32c81a4a | 416 | |
bcada37b | 417 | void block_job_event_completed(BlockJob *job, const char *msg) |
a66a2a36 | 418 | { |
bcada37b | 419 | qapi_event_send_block_job_completed(job->driver->job_type, |
8ccb9569 | 420 | job->id, |
bcada37b WX |
421 | job->len, |
422 | job->offset, | |
423 | job->speed, | |
424 | !!msg, | |
425 | msg, | |
426 | &error_abort); | |
a66a2a36 PB |
427 | } |
428 | ||
bcada37b | 429 | void block_job_event_ready(BlockJob *job) |
a66a2a36 | 430 | { |
ef6dbf1e HR |
431 | job->ready = true; |
432 | ||
518848a2 | 433 | qapi_event_send_block_job_ready(job->driver->job_type, |
8ccb9569 | 434 | job->id, |
518848a2 MA |
435 | job->len, |
436 | job->offset, | |
437 | job->speed, &error_abort); | |
a66a2a36 PB |
438 | } |
439 | ||
81e254dc | 440 | BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err, |
32c81a4a PB |
441 | int is_read, int error) |
442 | { | |
443 | BlockErrorAction action; | |
444 | ||
445 | switch (on_err) { | |
446 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
a589569f WX |
447 | action = (error == ENOSPC) ? |
448 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
32c81a4a PB |
449 | break; |
450 | case BLOCKDEV_ON_ERROR_STOP: | |
a589569f | 451 | action = BLOCK_ERROR_ACTION_STOP; |
32c81a4a PB |
452 | break; |
453 | case BLOCKDEV_ON_ERROR_REPORT: | |
a589569f | 454 | action = BLOCK_ERROR_ACTION_REPORT; |
32c81a4a PB |
455 | break; |
456 | case BLOCKDEV_ON_ERROR_IGNORE: | |
a589569f | 457 | action = BLOCK_ERROR_ACTION_IGNORE; |
32c81a4a PB |
458 | break; |
459 | default: | |
460 | abort(); | |
461 | } | |
8ccb9569 | 462 | qapi_event_send_block_job_error(job->id, |
5a2d2cbd WX |
463 | is_read ? IO_OPERATION_TYPE_READ : |
464 | IO_OPERATION_TYPE_WRITE, | |
465 | action, &error_abort); | |
a589569f | 466 | if (action == BLOCK_ERROR_ACTION_STOP) { |
751ebd76 FZ |
467 | /* make the pause user visible, which will be resumed from QMP. */ |
468 | job->user_paused = true; | |
32c81a4a PB |
469 | block_job_pause(job); |
470 | block_job_iostatus_set_err(job, error); | |
32c81a4a PB |
471 | } |
472 | return action; | |
473 | } | |
dec7d421 SH |
474 | |
475 | typedef struct { | |
476 | BlockJob *job; | |
477 | QEMUBH *bh; | |
478 | AioContext *aio_context; | |
479 | BlockJobDeferToMainLoopFn *fn; | |
480 | void *opaque; | |
481 | } BlockJobDeferToMainLoopData; | |
482 | ||
483 | static void block_job_defer_to_main_loop_bh(void *opaque) | |
484 | { | |
485 | BlockJobDeferToMainLoopData *data = opaque; | |
486 | AioContext *aio_context; | |
487 | ||
488 | qemu_bh_delete(data->bh); | |
489 | ||
490 | /* Prevent race with block_job_defer_to_main_loop() */ | |
491 | aio_context_acquire(data->aio_context); | |
492 | ||
493 | /* Fetch BDS AioContext again, in case it has changed */ | |
494 | aio_context = bdrv_get_aio_context(data->job->bs); | |
495 | aio_context_acquire(aio_context); | |
496 | ||
794f0141 | 497 | data->job->deferred_to_main_loop = false; |
dec7d421 SH |
498 | data->fn(data->job, data->opaque); |
499 | ||
500 | aio_context_release(aio_context); | |
501 | ||
502 | aio_context_release(data->aio_context); | |
503 | ||
504 | g_free(data); | |
505 | } | |
506 | ||
507 | void block_job_defer_to_main_loop(BlockJob *job, | |
508 | BlockJobDeferToMainLoopFn *fn, | |
509 | void *opaque) | |
510 | { | |
511 | BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); | |
512 | data->job = job; | |
513 | data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data); | |
514 | data->aio_context = bdrv_get_aio_context(job->bs); | |
515 | data->fn = fn; | |
516 | data->opaque = opaque; | |
794f0141 | 517 | job->deferred_to_main_loop = true; |
dec7d421 SH |
518 | |
519 | qemu_bh_schedule(data->bh); | |
520 | } | |
c55a832f FZ |
521 | |
522 | BlockJobTxn *block_job_txn_new(void) | |
523 | { | |
524 | BlockJobTxn *txn = g_new0(BlockJobTxn, 1); | |
525 | QLIST_INIT(&txn->jobs); | |
526 | txn->refcnt = 1; | |
527 | return txn; | |
528 | } | |
529 | ||
530 | static void block_job_txn_ref(BlockJobTxn *txn) | |
531 | { | |
532 | txn->refcnt++; | |
533 | } | |
534 | ||
535 | void block_job_txn_unref(BlockJobTxn *txn) | |
536 | { | |
537 | if (txn && --txn->refcnt == 0) { | |
538 | g_free(txn); | |
539 | } | |
540 | } | |
541 | ||
542 | void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job) | |
543 | { | |
544 | if (!txn) { | |
545 | return; | |
546 | } | |
547 | ||
548 | assert(!job->txn); | |
549 | job->txn = txn; | |
550 | ||
551 | QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); | |
552 | block_job_txn_ref(txn); | |
553 | } |