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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}, | |
11b61fbc | 68 | [BLOCK_JOB_VERB_FINALIZE] = {0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0}, |
5f241594 | 69 | [BLOCK_JOB_VERB_DISMISS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0}, |
0ec4dfb8 JS |
70 | }; |
71 | ||
c9de4050 JS |
72 | static void block_job_state_transition(BlockJob *job, BlockJobStatus s1) |
73 | { | |
74 | BlockJobStatus s0 = job->status; | |
75 | assert(s1 >= 0 && s1 <= BLOCK_JOB_STATUS__MAX); | |
76 | trace_block_job_state_transition(job, job->ret, BlockJobSTT[s0][s1] ? | |
77 | "allowed" : "disallowed", | |
78 | qapi_enum_lookup(&BlockJobStatus_lookup, | |
79 | s0), | |
80 | qapi_enum_lookup(&BlockJobStatus_lookup, | |
81 | s1)); | |
82 | assert(BlockJobSTT[s0][s1]); | |
83 | job->status = s1; | |
84 | } | |
85 | ||
0ec4dfb8 JS |
86 | static int block_job_apply_verb(BlockJob *job, BlockJobVerb bv, Error **errp) |
87 | { | |
88 | assert(bv >= 0 && bv <= BLOCK_JOB_VERB__MAX); | |
89 | trace_block_job_apply_verb(job, qapi_enum_lookup(&BlockJobStatus_lookup, | |
90 | job->status), | |
91 | qapi_enum_lookup(&BlockJobVerb_lookup, bv), | |
92 | BlockJobVerbTable[bv][job->status] ? | |
93 | "allowed" : "prohibited"); | |
94 | if (BlockJobVerbTable[bv][job->status]) { | |
95 | return 0; | |
96 | } | |
97 | error_setg(errp, "Job '%s' in state '%s' cannot accept command verb '%s'", | |
98 | job->id, qapi_enum_lookup(&BlockJobStatus_lookup, job->status), | |
99 | qapi_enum_lookup(&BlockJobVerb_lookup, bv)); | |
100 | return -EPERM; | |
101 | } | |
102 | ||
fc24908e PB |
103 | static void block_job_lock(void) |
104 | { | |
105 | qemu_mutex_lock(&block_job_mutex); | |
106 | } | |
107 | ||
108 | static void block_job_unlock(void) | |
109 | { | |
110 | qemu_mutex_unlock(&block_job_mutex); | |
111 | } | |
112 | ||
113 | static void __attribute__((__constructor__)) block_job_init(void) | |
114 | { | |
115 | qemu_mutex_init(&block_job_mutex); | |
116 | } | |
117 | ||
8254b6d9 JS |
118 | static void block_job_event_cancelled(BlockJob *job); |
119 | static void block_job_event_completed(BlockJob *job, const char *msg); | |
5f241594 | 120 | static int block_job_event_pending(BlockJob *job); |
aa9ef2e6 | 121 | static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job)); |
8254b6d9 | 122 | |
c55a832f FZ |
123 | /* Transactional group of block jobs */ |
124 | struct BlockJobTxn { | |
125 | ||
126 | /* Is this txn being cancelled? */ | |
127 | bool aborting; | |
128 | ||
129 | /* List of jobs */ | |
130 | QLIST_HEAD(, BlockJob) jobs; | |
131 | ||
132 | /* Reference count */ | |
133 | int refcnt; | |
134 | }; | |
135 | ||
a7112795 AG |
136 | static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs); |
137 | ||
88691b37 PB |
138 | /* |
139 | * The block job API is composed of two categories of functions. | |
140 | * | |
141 | * The first includes functions used by the monitor. The monitor is | |
142 | * peculiar in that it accesses the block job list with block_job_get, and | |
143 | * therefore needs consistency across block_job_get and the actual operation | |
144 | * (e.g. block_job_set_speed). The consistency is achieved with | |
145 | * aio_context_acquire/release. These functions are declared in blockjob.h. | |
146 | * | |
147 | * The second includes functions used by the block job drivers and sometimes | |
148 | * by the core block layer. These do not care about locking, because the | |
149 | * whole coroutine runs under the AioContext lock, and are declared in | |
150 | * blockjob_int.h. | |
151 | */ | |
152 | ||
a7112795 AG |
153 | BlockJob *block_job_next(BlockJob *job) |
154 | { | |
155 | if (!job) { | |
156 | return QLIST_FIRST(&block_jobs); | |
157 | } | |
158 | return QLIST_NEXT(job, job_list); | |
159 | } | |
160 | ||
ffb1f10c AG |
161 | BlockJob *block_job_get(const char *id) |
162 | { | |
163 | BlockJob *job; | |
164 | ||
165 | QLIST_FOREACH(job, &block_jobs, job_list) { | |
559b935f | 166 | if (job->id && !strcmp(id, job->id)) { |
ffb1f10c AG |
167 | return job; |
168 | } | |
169 | } | |
170 | ||
171 | return NULL; | |
172 | } | |
173 | ||
c8ab5c2d PB |
174 | BlockJobTxn *block_job_txn_new(void) |
175 | { | |
176 | BlockJobTxn *txn = g_new0(BlockJobTxn, 1); | |
177 | QLIST_INIT(&txn->jobs); | |
178 | txn->refcnt = 1; | |
179 | return txn; | |
180 | } | |
181 | ||
182 | static void block_job_txn_ref(BlockJobTxn *txn) | |
183 | { | |
184 | txn->refcnt++; | |
185 | } | |
186 | ||
187 | void block_job_txn_unref(BlockJobTxn *txn) | |
188 | { | |
189 | if (txn && --txn->refcnt == 0) { | |
190 | g_free(txn); | |
191 | } | |
192 | } | |
193 | ||
194 | void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job) | |
195 | { | |
196 | if (!txn) { | |
197 | return; | |
198 | } | |
199 | ||
200 | assert(!job->txn); | |
201 | job->txn = txn; | |
202 | ||
203 | QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); | |
204 | block_job_txn_ref(txn); | |
205 | } | |
206 | ||
f321dcb5 PB |
207 | static void block_job_pause(BlockJob *job) |
208 | { | |
209 | job->pause_count++; | |
210 | } | |
211 | ||
212 | static void block_job_resume(BlockJob *job) | |
213 | { | |
214 | assert(job->pause_count > 0); | |
215 | job->pause_count--; | |
216 | if (job->pause_count) { | |
217 | return; | |
218 | } | |
219 | block_job_enter(job); | |
220 | } | |
221 | ||
4172a003 | 222 | void block_job_ref(BlockJob *job) |
05b0d8e3 PB |
223 | { |
224 | ++job->refcnt; | |
225 | } | |
226 | ||
227 | static void block_job_attached_aio_context(AioContext *new_context, | |
228 | void *opaque); | |
229 | static void block_job_detach_aio_context(void *opaque); | |
230 | ||
4172a003 | 231 | void block_job_unref(BlockJob *job) |
05b0d8e3 PB |
232 | { |
233 | if (--job->refcnt == 0) { | |
3925cd3b | 234 | assert(job->status == BLOCK_JOB_STATUS_NULL); |
05b0d8e3 | 235 | BlockDriverState *bs = blk_bs(job->blk); |
0a3e155f | 236 | QLIST_REMOVE(job, job_list); |
05b0d8e3 PB |
237 | bs->job = NULL; |
238 | block_job_remove_all_bdrv(job); | |
239 | blk_remove_aio_context_notifier(job->blk, | |
240 | block_job_attached_aio_context, | |
241 | block_job_detach_aio_context, job); | |
242 | blk_unref(job->blk); | |
243 | error_free(job->blocker); | |
244 | g_free(job->id); | |
fc24908e | 245 | assert(!timer_pending(&job->sleep_timer)); |
05b0d8e3 PB |
246 | g_free(job); |
247 | } | |
248 | } | |
249 | ||
463e0be1 SH |
250 | static void block_job_attached_aio_context(AioContext *new_context, |
251 | void *opaque) | |
252 | { | |
253 | BlockJob *job = opaque; | |
254 | ||
255 | if (job->driver->attached_aio_context) { | |
256 | job->driver->attached_aio_context(job, new_context); | |
257 | } | |
258 | ||
259 | block_job_resume(job); | |
260 | } | |
261 | ||
bae8196d PB |
262 | static void block_job_drain(BlockJob *job) |
263 | { | |
264 | /* If job is !job->busy this kicks it into the next pause point. */ | |
265 | block_job_enter(job); | |
266 | ||
267 | blk_drain(job->blk); | |
268 | if (job->driver->drain) { | |
269 | job->driver->drain(job); | |
270 | } | |
271 | } | |
272 | ||
463e0be1 SH |
273 | static void block_job_detach_aio_context(void *opaque) |
274 | { | |
275 | BlockJob *job = opaque; | |
276 | ||
277 | /* In case the job terminates during aio_poll()... */ | |
278 | block_job_ref(job); | |
279 | ||
280 | block_job_pause(job); | |
281 | ||
463e0be1 | 282 | while (!job->paused && !job->completed) { |
bae8196d | 283 | block_job_drain(job); |
463e0be1 SH |
284 | } |
285 | ||
286 | block_job_unref(job); | |
287 | } | |
288 | ||
f321dcb5 PB |
289 | static char *child_job_get_parent_desc(BdrvChild *c) |
290 | { | |
291 | BlockJob *job = c->opaque; | |
292 | return g_strdup_printf("%s job '%s'", | |
977c736f | 293 | BlockJobType_str(job->driver->job_type), |
f321dcb5 PB |
294 | job->id); |
295 | } | |
296 | ||
ad90feba | 297 | static void child_job_drained_begin(BdrvChild *c) |
f321dcb5 | 298 | { |
ad90feba | 299 | BlockJob *job = c->opaque; |
f321dcb5 PB |
300 | block_job_pause(job); |
301 | } | |
302 | ||
ad90feba | 303 | static void child_job_drained_end(BdrvChild *c) |
f321dcb5 | 304 | { |
ad90feba | 305 | BlockJob *job = c->opaque; |
f321dcb5 PB |
306 | block_job_resume(job); |
307 | } | |
308 | ||
ad90feba KW |
309 | static const BdrvChildRole child_job = { |
310 | .get_parent_desc = child_job_get_parent_desc, | |
311 | .drained_begin = child_job_drained_begin, | |
312 | .drained_end = child_job_drained_end, | |
313 | .stay_at_node = true, | |
f321dcb5 PB |
314 | }; |
315 | ||
bbc02b90 KW |
316 | void block_job_remove_all_bdrv(BlockJob *job) |
317 | { | |
318 | GSList *l; | |
319 | for (l = job->nodes; l; l = l->next) { | |
320 | BdrvChild *c = l->data; | |
321 | bdrv_op_unblock_all(c->bs, job->blocker); | |
322 | bdrv_root_unref_child(c); | |
323 | } | |
324 | g_slist_free(job->nodes); | |
325 | job->nodes = NULL; | |
326 | } | |
327 | ||
76d554e2 KW |
328 | int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs, |
329 | uint64_t perm, uint64_t shared_perm, Error **errp) | |
23d402d4 | 330 | { |
76d554e2 KW |
331 | BdrvChild *c; |
332 | ||
333 | c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm, | |
334 | job, errp); | |
335 | if (c == NULL) { | |
336 | return -EPERM; | |
337 | } | |
338 | ||
339 | job->nodes = g_slist_prepend(job->nodes, c); | |
23d402d4 AG |
340 | bdrv_ref(bs); |
341 | bdrv_op_block_all(bs, job->blocker); | |
76d554e2 KW |
342 | |
343 | return 0; | |
23d402d4 AG |
344 | } |
345 | ||
559b935f JS |
346 | bool block_job_is_internal(BlockJob *job) |
347 | { | |
348 | return (job->id == NULL); | |
349 | } | |
350 | ||
5ccac6f1 JS |
351 | static bool block_job_started(BlockJob *job) |
352 | { | |
353 | return job->co; | |
354 | } | |
355 | ||
e3796a24 JS |
356 | /** |
357 | * All jobs must allow a pause point before entering their job proper. This | |
358 | * ensures that jobs can be paused prior to being started, then resumed later. | |
359 | */ | |
360 | static void coroutine_fn block_job_co_entry(void *opaque) | |
361 | { | |
362 | BlockJob *job = opaque; | |
363 | ||
364 | assert(job && job->driver && job->driver->start); | |
365 | block_job_pause_point(job); | |
366 | job->driver->start(job); | |
367 | } | |
368 | ||
fc24908e PB |
369 | static void block_job_sleep_timer_cb(void *opaque) |
370 | { | |
371 | BlockJob *job = opaque; | |
372 | ||
373 | block_job_enter(job); | |
374 | } | |
375 | ||
5ccac6f1 JS |
376 | void block_job_start(BlockJob *job) |
377 | { | |
378 | assert(job && !block_job_started(job) && job->paused && | |
e3796a24 JS |
379 | job->driver && job->driver->start); |
380 | job->co = qemu_coroutine_create(block_job_co_entry, job); | |
381 | job->pause_count--; | |
382 | job->busy = true; | |
383 | job->paused = false; | |
c9de4050 | 384 | block_job_state_transition(job, BLOCK_JOB_STATUS_RUNNING); |
aef4278c | 385 | bdrv_coroutine_enter(blk_bs(job->blk), job->co); |
5ccac6f1 JS |
386 | } |
387 | ||
3925cd3b JS |
388 | static void block_job_decommission(BlockJob *job) |
389 | { | |
390 | assert(job); | |
391 | job->completed = true; | |
392 | job->busy = false; | |
393 | job->paused = false; | |
394 | job->deferred_to_main_loop = true; | |
395 | block_job_state_transition(job, BLOCK_JOB_STATUS_NULL); | |
396 | block_job_unref(job); | |
397 | } | |
398 | ||
75f71059 JS |
399 | static void block_job_do_dismiss(BlockJob *job) |
400 | { | |
401 | block_job_decommission(job); | |
402 | } | |
403 | ||
e0cf0364 JS |
404 | static void block_job_conclude(BlockJob *job) |
405 | { | |
406 | block_job_state_transition(job, BLOCK_JOB_STATUS_CONCLUDED); | |
75f71059 JS |
407 | if (job->auto_dismiss || !block_job_started(job)) { |
408 | block_job_do_dismiss(job); | |
409 | } | |
e0cf0364 JS |
410 | } |
411 | ||
35d6b368 JS |
412 | static void block_job_update_rc(BlockJob *job) |
413 | { | |
414 | if (!job->ret && block_job_is_cancelled(job)) { | |
415 | job->ret = -ECANCELED; | |
416 | } | |
417 | if (job->ret) { | |
418 | block_job_state_transition(job, BLOCK_JOB_STATUS_ABORTING); | |
419 | } | |
420 | } | |
421 | ||
2da4617a JS |
422 | static int block_job_prepare(BlockJob *job) |
423 | { | |
424 | if (job->ret == 0 && job->driver->prepare) { | |
425 | job->ret = job->driver->prepare(job); | |
426 | } | |
427 | return job->ret; | |
428 | } | |
429 | ||
43628d93 JS |
430 | static void block_job_commit(BlockJob *job) |
431 | { | |
432 | assert(!job->ret); | |
433 | if (job->driver->commit) { | |
434 | job->driver->commit(job); | |
435 | } | |
436 | } | |
437 | ||
438 | static void block_job_abort(BlockJob *job) | |
439 | { | |
440 | assert(job->ret); | |
441 | if (job->driver->abort) { | |
442 | job->driver->abort(job); | |
443 | } | |
444 | } | |
445 | ||
446 | static void block_job_clean(BlockJob *job) | |
447 | { | |
448 | if (job->driver->clean) { | |
449 | job->driver->clean(job); | |
450 | } | |
451 | } | |
452 | ||
11b61fbc | 453 | static int block_job_finalize_single(BlockJob *job) |
c55a832f | 454 | { |
4fb588e9 PB |
455 | assert(job->completed); |
456 | ||
35d6b368 JS |
457 | /* Ensure abort is called for late-transactional failures */ |
458 | block_job_update_rc(job); | |
10a3fbb0 | 459 | |
c55a832f | 460 | if (!job->ret) { |
43628d93 | 461 | block_job_commit(job); |
c55a832f | 462 | } else { |
43628d93 | 463 | block_job_abort(job); |
e8a40bf7 | 464 | } |
43628d93 | 465 | block_job_clean(job); |
8254b6d9 JS |
466 | |
467 | if (job->cb) { | |
468 | job->cb(job->opaque, job->ret); | |
469 | } | |
5ccac6f1 JS |
470 | |
471 | /* Emit events only if we actually started */ | |
472 | if (block_job_started(job)) { | |
473 | if (block_job_is_cancelled(job)) { | |
474 | block_job_event_cancelled(job); | |
475 | } else { | |
476 | const char *msg = NULL; | |
477 | if (job->ret < 0) { | |
478 | msg = strerror(-job->ret); | |
479 | } | |
480 | block_job_event_completed(job, msg); | |
8254b6d9 | 481 | } |
8254b6d9 JS |
482 | } |
483 | ||
75859b94 JS |
484 | QLIST_REMOVE(job, txn_list); |
485 | block_job_txn_unref(job->txn); | |
e0cf0364 | 486 | block_job_conclude(job); |
2da4617a | 487 | return 0; |
c55a832f FZ |
488 | } |
489 | ||
4c241cf5 PB |
490 | static void block_job_cancel_async(BlockJob *job) |
491 | { | |
492 | if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) { | |
493 | block_job_iostatus_reset(job); | |
494 | } | |
495 | if (job->user_paused) { | |
496 | /* Do not call block_job_enter here, the caller will handle it. */ | |
497 | job->user_paused = false; | |
498 | job->pause_count--; | |
499 | } | |
500 | job->cancelled = true; | |
501 | } | |
502 | ||
5f241594 | 503 | static int block_job_txn_apply(BlockJobTxn *txn, int fn(BlockJob *), bool lock) |
efe4d4b7 JS |
504 | { |
505 | AioContext *ctx; | |
506 | BlockJob *job, *next; | |
2da4617a | 507 | int rc = 0; |
efe4d4b7 JS |
508 | |
509 | QLIST_FOREACH_SAFE(job, &txn->jobs, txn_list, next) { | |
5f241594 JS |
510 | if (lock) { |
511 | ctx = blk_get_aio_context(job->blk); | |
512 | aio_context_acquire(ctx); | |
513 | } | |
2da4617a | 514 | rc = fn(job); |
5f241594 JS |
515 | if (lock) { |
516 | aio_context_release(ctx); | |
517 | } | |
2da4617a JS |
518 | if (rc) { |
519 | break; | |
520 | } | |
efe4d4b7 | 521 | } |
2da4617a | 522 | return rc; |
efe4d4b7 JS |
523 | } |
524 | ||
c8ab5c2d PB |
525 | static int block_job_finish_sync(BlockJob *job, |
526 | void (*finish)(BlockJob *, Error **errp), | |
527 | Error **errp) | |
528 | { | |
529 | Error *local_err = NULL; | |
530 | int ret; | |
531 | ||
532 | assert(blk_bs(job->blk)->job == job); | |
533 | ||
534 | block_job_ref(job); | |
535 | ||
4fb588e9 PB |
536 | if (finish) { |
537 | finish(job, &local_err); | |
538 | } | |
c8ab5c2d PB |
539 | if (local_err) { |
540 | error_propagate(errp, local_err); | |
541 | block_job_unref(job); | |
542 | return -EBUSY; | |
543 | } | |
544 | /* block_job_drain calls block_job_enter, and it should be enough to | |
545 | * induce progress until the job completes or moves to the main thread. | |
546 | */ | |
547 | while (!job->deferred_to_main_loop && !job->completed) { | |
548 | block_job_drain(job); | |
549 | } | |
550 | while (!job->completed) { | |
551 | aio_poll(qemu_get_aio_context(), true); | |
552 | } | |
553 | ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret; | |
554 | block_job_unref(job); | |
555 | return ret; | |
556 | } | |
557 | ||
c55a832f FZ |
558 | static void block_job_completed_txn_abort(BlockJob *job) |
559 | { | |
560 | AioContext *ctx; | |
561 | BlockJobTxn *txn = job->txn; | |
4fb588e9 | 562 | BlockJob *other_job; |
c55a832f FZ |
563 | |
564 | if (txn->aborting) { | |
565 | /* | |
566 | * We are cancelled by another job, which will handle everything. | |
567 | */ | |
568 | return; | |
569 | } | |
570 | txn->aborting = true; | |
4fb588e9 PB |
571 | block_job_txn_ref(txn); |
572 | ||
c55a832f FZ |
573 | /* We are the first failed job. Cancel other jobs. */ |
574 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
b6d2e599 | 575 | ctx = blk_get_aio_context(other_job->blk); |
c55a832f FZ |
576 | aio_context_acquire(ctx); |
577 | } | |
4fb588e9 PB |
578 | |
579 | /* Other jobs are effectively cancelled by us, set the status for | |
580 | * them; this job, however, may or may not be cancelled, depending | |
581 | * on the caller, so leave it. */ | |
c55a832f | 582 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { |
4fb588e9 PB |
583 | if (other_job != job) { |
584 | block_job_cancel_async(other_job); | |
c55a832f | 585 | } |
c55a832f | 586 | } |
4fb588e9 PB |
587 | while (!QLIST_EMPTY(&txn->jobs)) { |
588 | other_job = QLIST_FIRST(&txn->jobs); | |
b6d2e599 | 589 | ctx = blk_get_aio_context(other_job->blk); |
4fb588e9 PB |
590 | if (!other_job->completed) { |
591 | assert(other_job->cancelled); | |
592 | block_job_finish_sync(other_job, NULL, NULL); | |
593 | } | |
11b61fbc | 594 | block_job_finalize_single(other_job); |
c55a832f FZ |
595 | aio_context_release(ctx); |
596 | } | |
4fb588e9 PB |
597 | |
598 | block_job_txn_unref(txn); | |
c55a832f FZ |
599 | } |
600 | ||
11b61fbc JS |
601 | static int block_job_needs_finalize(BlockJob *job) |
602 | { | |
603 | return !job->auto_finalize; | |
604 | } | |
605 | ||
606 | static void block_job_do_finalize(BlockJob *job) | |
607 | { | |
608 | int rc; | |
609 | assert(job && job->txn); | |
610 | ||
611 | /* prepare the transaction to complete */ | |
612 | rc = block_job_txn_apply(job->txn, block_job_prepare, true); | |
613 | if (rc) { | |
614 | block_job_completed_txn_abort(job); | |
615 | } else { | |
616 | block_job_txn_apply(job->txn, block_job_finalize_single, true); | |
617 | } | |
618 | } | |
619 | ||
c55a832f FZ |
620 | static void block_job_completed_txn_success(BlockJob *job) |
621 | { | |
c55a832f | 622 | BlockJobTxn *txn = job->txn; |
efe4d4b7 | 623 | BlockJob *other_job; |
2da4617a | 624 | |
e8af5686 JS |
625 | block_job_state_transition(job, BLOCK_JOB_STATUS_WAITING); |
626 | ||
c55a832f FZ |
627 | /* |
628 | * Successful completion, see if there are other running jobs in this | |
629 | * txn. | |
630 | */ | |
631 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { | |
632 | if (!other_job->completed) { | |
633 | return; | |
634 | } | |
c55a832f | 635 | assert(other_job->ret == 0); |
c55a832f | 636 | } |
2da4617a | 637 | |
5f241594 | 638 | block_job_txn_apply(txn, block_job_event_pending, false); |
11b61fbc JS |
639 | |
640 | /* If no jobs need manual finalization, automatically do so */ | |
641 | if (block_job_txn_apply(txn, block_job_needs_finalize, false) == 0) { | |
642 | block_job_do_finalize(job); | |
643 | } | |
c55a832f FZ |
644 | } |
645 | ||
aa9ef2e6 JS |
646 | /* Assumes the block_job_mutex is held */ |
647 | static bool block_job_timer_pending(BlockJob *job) | |
648 | { | |
649 | return timer_pending(&job->sleep_timer); | |
650 | } | |
651 | ||
2f0c9fe6 PB |
652 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
653 | { | |
654 | Error *local_err = NULL; | |
aa9ef2e6 | 655 | int64_t old_speed = job->speed; |
2f0c9fe6 | 656 | |
3fc4b10a | 657 | if (!job->driver->set_speed) { |
c6bd8c70 | 658 | error_setg(errp, QERR_UNSUPPORTED); |
2f0c9fe6 PB |
659 | return; |
660 | } | |
0ec4dfb8 JS |
661 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_SET_SPEED, errp)) { |
662 | return; | |
663 | } | |
3fc4b10a | 664 | job->driver->set_speed(job, speed, &local_err); |
84d18f06 | 665 | if (local_err) { |
2f0c9fe6 PB |
666 | error_propagate(errp, local_err); |
667 | return; | |
668 | } | |
669 | ||
670 | job->speed = speed; | |
d4fce188 | 671 | if (speed && speed <= old_speed) { |
aa9ef2e6 JS |
672 | return; |
673 | } | |
674 | ||
675 | /* kick only if a timer is pending */ | |
676 | block_job_enter_cond(job, block_job_timer_pending); | |
2f0c9fe6 PB |
677 | } |
678 | ||
aeae883b PB |
679 | void block_job_complete(BlockJob *job, Error **errp) |
680 | { | |
559b935f JS |
681 | /* Should not be reachable via external interface for internal jobs */ |
682 | assert(job->id); | |
0ec4dfb8 JS |
683 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_COMPLETE, errp)) { |
684 | return; | |
685 | } | |
686 | if (job->pause_count || job->cancelled || !job->driver->complete) { | |
9df229c3 AG |
687 | error_setg(errp, "The active block job '%s' cannot be completed", |
688 | job->id); | |
aeae883b PB |
689 | return; |
690 | } | |
691 | ||
3fc4b10a | 692 | job->driver->complete(job, errp); |
aeae883b PB |
693 | } |
694 | ||
11b61fbc JS |
695 | void block_job_finalize(BlockJob *job, Error **errp) |
696 | { | |
697 | assert(job && job->id && job->txn); | |
698 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_FINALIZE, errp)) { | |
699 | return; | |
700 | } | |
701 | block_job_do_finalize(job); | |
702 | } | |
703 | ||
75f71059 JS |
704 | void block_job_dismiss(BlockJob **jobptr, Error **errp) |
705 | { | |
706 | BlockJob *job = *jobptr; | |
707 | /* similarly to _complete, this is QMP-interface only. */ | |
708 | assert(job->id); | |
709 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_DISMISS, errp)) { | |
710 | return; | |
711 | } | |
712 | ||
713 | block_job_do_dismiss(job); | |
714 | *jobptr = NULL; | |
715 | } | |
716 | ||
0ec4dfb8 | 717 | void block_job_user_pause(BlockJob *job, Error **errp) |
0df4ba58 | 718 | { |
0ec4dfb8 JS |
719 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_PAUSE, errp)) { |
720 | return; | |
721 | } | |
722 | if (job->user_paused) { | |
723 | error_setg(errp, "Job is already paused"); | |
724 | return; | |
725 | } | |
0df4ba58 JS |
726 | job->user_paused = true; |
727 | block_job_pause(job); | |
728 | } | |
729 | ||
0df4ba58 JS |
730 | bool block_job_user_paused(BlockJob *job) |
731 | { | |
6573d9c6 | 732 | return job->user_paused; |
0df4ba58 JS |
733 | } |
734 | ||
0ec4dfb8 | 735 | void block_job_user_resume(BlockJob *job, Error **errp) |
0df4ba58 | 736 | { |
0ec4dfb8 JS |
737 | assert(job); |
738 | if (!job->user_paused || job->pause_count <= 0) { | |
739 | error_setg(errp, "Can't resume a job that was not paused"); | |
740 | return; | |
0df4ba58 | 741 | } |
0ec4dfb8 JS |
742 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_RESUME, errp)) { |
743 | return; | |
744 | } | |
745 | block_job_iostatus_reset(job); | |
746 | job->user_paused = false; | |
747 | block_job_resume(job); | |
0df4ba58 JS |
748 | } |
749 | ||
8acc72a4 PB |
750 | void block_job_cancel(BlockJob *job) |
751 | { | |
e0cf0364 | 752 | if (job->status == BLOCK_JOB_STATUS_CONCLUDED) { |
75f71059 | 753 | block_job_do_dismiss(job); |
11b61fbc JS |
754 | return; |
755 | } | |
756 | block_job_cancel_async(job); | |
757 | if (!block_job_started(job)) { | |
5ccac6f1 | 758 | block_job_completed(job, -ECANCELED); |
11b61fbc JS |
759 | } else if (job->deferred_to_main_loop) { |
760 | block_job_completed_txn_abort(job); | |
761 | } else { | |
762 | block_job_enter(job); | |
5ccac6f1 | 763 | } |
8acc72a4 PB |
764 | } |
765 | ||
0ec4dfb8 JS |
766 | void block_job_user_cancel(BlockJob *job, Error **errp) |
767 | { | |
768 | if (block_job_apply_verb(job, BLOCK_JOB_VERB_CANCEL, errp)) { | |
769 | return; | |
770 | } | |
771 | block_job_cancel(job); | |
772 | } | |
773 | ||
345f9e1b HR |
774 | /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be |
775 | * used with block_job_finish_sync() without the need for (rather nasty) | |
776 | * function pointer casts there. */ | |
777 | static void block_job_cancel_err(BlockJob *job, Error **errp) | |
778 | { | |
779 | block_job_cancel(job); | |
780 | } | |
781 | ||
782 | int block_job_cancel_sync(BlockJob *job) | |
783 | { | |
784 | return block_job_finish_sync(job, &block_job_cancel_err, NULL); | |
785 | } | |
786 | ||
a1a2af07 KW |
787 | void block_job_cancel_sync_all(void) |
788 | { | |
789 | BlockJob *job; | |
790 | AioContext *aio_context; | |
791 | ||
792 | while ((job = QLIST_FIRST(&block_jobs))) { | |
b6d2e599 | 793 | aio_context = blk_get_aio_context(job->blk); |
a1a2af07 KW |
794 | aio_context_acquire(aio_context); |
795 | block_job_cancel_sync(job); | |
796 | aio_context_release(aio_context); | |
797 | } | |
798 | } | |
799 | ||
345f9e1b HR |
800 | int block_job_complete_sync(BlockJob *job, Error **errp) |
801 | { | |
802 | return block_job_finish_sync(job, &block_job_complete, errp); | |
803 | } | |
804 | ||
559b935f | 805 | BlockJobInfo *block_job_query(BlockJob *job, Error **errp) |
30e628b7 | 806 | { |
559b935f JS |
807 | BlockJobInfo *info; |
808 | ||
809 | if (block_job_is_internal(job)) { | |
810 | error_setg(errp, "Cannot query QEMU internal jobs"); | |
811 | return NULL; | |
812 | } | |
813 | info = g_new0(BlockJobInfo, 1); | |
977c736f | 814 | info->type = g_strdup(BlockJobType_str(job->driver->job_type)); |
8ccb9569 | 815 | info->device = g_strdup(job->id); |
32c81a4a | 816 | info->len = job->len; |
fc24908e | 817 | info->busy = atomic_read(&job->busy); |
751ebd76 | 818 | info->paused = job->pause_count > 0; |
32c81a4a PB |
819 | info->offset = job->offset; |
820 | info->speed = job->speed; | |
821 | info->io_status = job->iostatus; | |
ef6dbf1e | 822 | info->ready = job->ready; |
58b295ba | 823 | info->status = job->status; |
b40dacdc JS |
824 | info->auto_finalize = job->auto_finalize; |
825 | info->auto_dismiss = job->auto_dismiss; | |
30e628b7 PB |
826 | return info; |
827 | } | |
32c81a4a PB |
828 | |
829 | static void block_job_iostatus_set_err(BlockJob *job, int error) | |
830 | { | |
831 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
832 | job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
833 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
834 | } | |
835 | } | |
836 | ||
8254b6d9 | 837 | static void block_job_event_cancelled(BlockJob *job) |
bcada37b | 838 | { |
559b935f JS |
839 | if (block_job_is_internal(job)) { |
840 | return; | |
841 | } | |
842 | ||
bcada37b | 843 | qapi_event_send_block_job_cancelled(job->driver->job_type, |
8ccb9569 | 844 | job->id, |
bcada37b WX |
845 | job->len, |
846 | job->offset, | |
847 | job->speed, | |
848 | &error_abort); | |
849 | } | |
32c81a4a | 850 | |
8254b6d9 | 851 | static void block_job_event_completed(BlockJob *job, const char *msg) |
a66a2a36 | 852 | { |
559b935f JS |
853 | if (block_job_is_internal(job)) { |
854 | return; | |
855 | } | |
856 | ||
bcada37b | 857 | qapi_event_send_block_job_completed(job->driver->job_type, |
8ccb9569 | 858 | job->id, |
bcada37b WX |
859 | job->len, |
860 | job->offset, | |
861 | job->speed, | |
862 | !!msg, | |
863 | msg, | |
864 | &error_abort); | |
a66a2a36 PB |
865 | } |
866 | ||
5f241594 JS |
867 | static int block_job_event_pending(BlockJob *job) |
868 | { | |
869 | block_job_state_transition(job, BLOCK_JOB_STATUS_PENDING); | |
870 | if (!job->auto_finalize && !block_job_is_internal(job)) { | |
871 | qapi_event_send_block_job_pending(job->driver->job_type, | |
872 | job->id, | |
873 | &error_abort); | |
874 | } | |
875 | return 0; | |
876 | } | |
877 | ||
88691b37 PB |
878 | /* |
879 | * API for block job drivers and the block layer. These functions are | |
880 | * declared in blockjob_int.h. | |
881 | */ | |
882 | ||
883 | void *block_job_create(const char *job_id, const BlockJobDriver *driver, | |
75859b94 | 884 | BlockJobTxn *txn, BlockDriverState *bs, uint64_t perm, |
88691b37 PB |
885 | uint64_t shared_perm, int64_t speed, int flags, |
886 | BlockCompletionFunc *cb, void *opaque, Error **errp) | |
887 | { | |
888 | BlockBackend *blk; | |
889 | BlockJob *job; | |
890 | int ret; | |
891 | ||
892 | if (bs->job) { | |
893 | error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); | |
894 | return NULL; | |
895 | } | |
896 | ||
897 | if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) { | |
898 | job_id = bdrv_get_device_name(bs); | |
899 | if (!*job_id) { | |
900 | error_setg(errp, "An explicit job ID is required for this node"); | |
901 | return NULL; | |
902 | } | |
903 | } | |
904 | ||
905 | if (job_id) { | |
906 | if (flags & BLOCK_JOB_INTERNAL) { | |
907 | error_setg(errp, "Cannot specify job ID for internal block job"); | |
908 | return NULL; | |
909 | } | |
910 | ||
911 | if (!id_wellformed(job_id)) { | |
912 | error_setg(errp, "Invalid job ID '%s'", job_id); | |
913 | return NULL; | |
914 | } | |
915 | ||
916 | if (block_job_get(job_id)) { | |
917 | error_setg(errp, "Job ID '%s' already in use", job_id); | |
918 | return NULL; | |
919 | } | |
920 | } | |
921 | ||
922 | blk = blk_new(perm, shared_perm); | |
923 | ret = blk_insert_bs(blk, bs, errp); | |
924 | if (ret < 0) { | |
925 | blk_unref(blk); | |
926 | return NULL; | |
927 | } | |
928 | ||
929 | job = g_malloc0(driver->instance_size); | |
930 | job->driver = driver; | |
931 | job->id = g_strdup(job_id); | |
932 | job->blk = blk; | |
933 | job->cb = cb; | |
934 | job->opaque = opaque; | |
935 | job->busy = false; | |
936 | job->paused = true; | |
937 | job->pause_count = 1; | |
938 | job->refcnt = 1; | |
5f241594 | 939 | job->auto_finalize = !(flags & BLOCK_JOB_MANUAL_FINALIZE); |
75f71059 | 940 | job->auto_dismiss = !(flags & BLOCK_JOB_MANUAL_DISMISS); |
c9de4050 | 941 | block_job_state_transition(job, BLOCK_JOB_STATUS_CREATED); |
fc24908e PB |
942 | aio_timer_init(qemu_get_aio_context(), &job->sleep_timer, |
943 | QEMU_CLOCK_REALTIME, SCALE_NS, | |
944 | block_job_sleep_timer_cb, job); | |
88691b37 PB |
945 | |
946 | error_setg(&job->blocker, "block device is in use by block job: %s", | |
977c736f | 947 | BlockJobType_str(driver->job_type)); |
88691b37 PB |
948 | block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort); |
949 | bs->job = job; | |
950 | ||
88691b37 PB |
951 | bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); |
952 | ||
953 | QLIST_INSERT_HEAD(&block_jobs, job, job_list); | |
954 | ||
955 | blk_add_aio_context_notifier(blk, block_job_attached_aio_context, | |
956 | block_job_detach_aio_context, job); | |
957 | ||
958 | /* Only set speed when necessary to avoid NotSupported error */ | |
959 | if (speed != 0) { | |
960 | Error *local_err = NULL; | |
961 | ||
962 | block_job_set_speed(job, speed, &local_err); | |
963 | if (local_err) { | |
3925cd3b | 964 | block_job_early_fail(job); |
88691b37 PB |
965 | error_propagate(errp, local_err); |
966 | return NULL; | |
967 | } | |
968 | } | |
75859b94 JS |
969 | |
970 | /* Single jobs are modeled as single-job transactions for sake of | |
971 | * consolidating the job management logic */ | |
972 | if (!txn) { | |
973 | txn = block_job_txn_new(); | |
974 | block_job_txn_add_job(txn, job); | |
975 | block_job_txn_unref(txn); | |
976 | } else { | |
977 | block_job_txn_add_job(txn, job); | |
978 | } | |
979 | ||
88691b37 PB |
980 | return job; |
981 | } | |
982 | ||
f321dcb5 PB |
983 | void block_job_pause_all(void) |
984 | { | |
985 | BlockJob *job = NULL; | |
986 | while ((job = block_job_next(job))) { | |
987 | AioContext *aio_context = blk_get_aio_context(job->blk); | |
988 | ||
989 | aio_context_acquire(aio_context); | |
3d5d319e | 990 | block_job_ref(job); |
f321dcb5 PB |
991 | block_job_pause(job); |
992 | aio_context_release(aio_context); | |
993 | } | |
994 | } | |
995 | ||
88691b37 PB |
996 | void block_job_early_fail(BlockJob *job) |
997 | { | |
3925cd3b JS |
998 | assert(job->status == BLOCK_JOB_STATUS_CREATED); |
999 | block_job_decommission(job); | |
88691b37 PB |
1000 | } |
1001 | ||
1002 | void block_job_completed(BlockJob *job, int ret) | |
1003 | { | |
75859b94 | 1004 | assert(job && job->txn && !job->completed); |
88691b37 | 1005 | assert(blk_bs(job->blk)->job == job); |
88691b37 PB |
1006 | job->completed = true; |
1007 | job->ret = ret; | |
35d6b368 JS |
1008 | block_job_update_rc(job); |
1009 | trace_block_job_completed(job, ret, job->ret); | |
1010 | if (job->ret) { | |
88691b37 PB |
1011 | block_job_completed_txn_abort(job); |
1012 | } else { | |
1013 | block_job_completed_txn_success(job); | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | static bool block_job_should_pause(BlockJob *job) | |
1018 | { | |
1019 | return job->pause_count > 0; | |
1020 | } | |
1021 | ||
fc24908e PB |
1022 | /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds. |
1023 | * Reentering the job coroutine with block_job_enter() before the timer has | |
1024 | * expired is allowed and cancels the timer. | |
1025 | * | |
1026 | * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be | |
1027 | * called explicitly. */ | |
1028 | static void block_job_do_yield(BlockJob *job, uint64_t ns) | |
356f59b8 | 1029 | { |
fc24908e PB |
1030 | block_job_lock(); |
1031 | if (ns != -1) { | |
1032 | timer_mod(&job->sleep_timer, ns); | |
1033 | } | |
356f59b8 | 1034 | job->busy = false; |
fc24908e | 1035 | block_job_unlock(); |
356f59b8 PB |
1036 | qemu_coroutine_yield(); |
1037 | ||
1038 | /* Set by block_job_enter before re-entering the coroutine. */ | |
1039 | assert(job->busy); | |
1040 | } | |
1041 | ||
88691b37 PB |
1042 | void coroutine_fn block_job_pause_point(BlockJob *job) |
1043 | { | |
1044 | assert(job && block_job_started(job)); | |
1045 | ||
1046 | if (!block_job_should_pause(job)) { | |
1047 | return; | |
1048 | } | |
1049 | if (block_job_is_cancelled(job)) { | |
1050 | return; | |
1051 | } | |
1052 | ||
1053 | if (job->driver->pause) { | |
1054 | job->driver->pause(job); | |
1055 | } | |
1056 | ||
1057 | if (block_job_should_pause(job) && !block_job_is_cancelled(job)) { | |
58b295ba | 1058 | BlockJobStatus status = job->status; |
c9de4050 JS |
1059 | block_job_state_transition(job, status == BLOCK_JOB_STATUS_READY ? \ |
1060 | BLOCK_JOB_STATUS_STANDBY : \ | |
1061 | BLOCK_JOB_STATUS_PAUSED); | |
88691b37 | 1062 | job->paused = true; |
fc24908e | 1063 | block_job_do_yield(job, -1); |
88691b37 | 1064 | job->paused = false; |
c9de4050 | 1065 | block_job_state_transition(job, status); |
88691b37 PB |
1066 | } |
1067 | ||
1068 | if (job->driver->resume) { | |
1069 | job->driver->resume(job); | |
1070 | } | |
1071 | } | |
1072 | ||
f321dcb5 PB |
1073 | void block_job_resume_all(void) |
1074 | { | |
3d5d319e AG |
1075 | BlockJob *job, *next; |
1076 | ||
1077 | QLIST_FOREACH_SAFE(job, &block_jobs, job_list, next) { | |
f321dcb5 PB |
1078 | AioContext *aio_context = blk_get_aio_context(job->blk); |
1079 | ||
1080 | aio_context_acquire(aio_context); | |
1081 | block_job_resume(job); | |
3d5d319e | 1082 | block_job_unref(job); |
f321dcb5 PB |
1083 | aio_context_release(aio_context); |
1084 | } | |
1085 | } | |
1086 | ||
aa9ef2e6 JS |
1087 | /* |
1088 | * Conditionally enter a block_job pending a call to fn() while | |
1089 | * under the block_job_lock critical section. | |
1090 | */ | |
1091 | static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job)) | |
88691b37 | 1092 | { |
eb05e011 PB |
1093 | if (!block_job_started(job)) { |
1094 | return; | |
1095 | } | |
1096 | if (job->deferred_to_main_loop) { | |
1097 | return; | |
1098 | } | |
1099 | ||
fc24908e | 1100 | block_job_lock(); |
356f59b8 | 1101 | if (job->busy) { |
fc24908e | 1102 | block_job_unlock(); |
356f59b8 | 1103 | return; |
88691b37 | 1104 | } |
356f59b8 | 1105 | |
aa9ef2e6 JS |
1106 | if (fn && !fn(job)) { |
1107 | block_job_unlock(); | |
1108 | return; | |
1109 | } | |
1110 | ||
fc24908e PB |
1111 | assert(!job->deferred_to_main_loop); |
1112 | timer_del(&job->sleep_timer); | |
356f59b8 | 1113 | job->busy = true; |
fc24908e | 1114 | block_job_unlock(); |
356f59b8 | 1115 | aio_co_wake(job->co); |
88691b37 PB |
1116 | } |
1117 | ||
aa9ef2e6 JS |
1118 | void block_job_enter(BlockJob *job) |
1119 | { | |
1120 | block_job_enter_cond(job, NULL); | |
1121 | } | |
1122 | ||
88691b37 PB |
1123 | bool block_job_is_cancelled(BlockJob *job) |
1124 | { | |
1125 | return job->cancelled; | |
1126 | } | |
1127 | ||
5bf1d5a7 | 1128 | void block_job_sleep_ns(BlockJob *job, int64_t ns) |
88691b37 PB |
1129 | { |
1130 | assert(job->busy); | |
1131 | ||
1132 | /* Check cancellation *before* setting busy = false, too! */ | |
1133 | if (block_job_is_cancelled(job)) { | |
1134 | return; | |
1135 | } | |
1136 | ||
88691b37 | 1137 | if (!block_job_should_pause(job)) { |
fc24908e | 1138 | block_job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns); |
88691b37 | 1139 | } |
88691b37 PB |
1140 | |
1141 | block_job_pause_point(job); | |
1142 | } | |
1143 | ||
1144 | void block_job_yield(BlockJob *job) | |
1145 | { | |
1146 | assert(job->busy); | |
1147 | ||
1148 | /* Check cancellation *before* setting busy = false, too! */ | |
1149 | if (block_job_is_cancelled(job)) { | |
1150 | return; | |
1151 | } | |
1152 | ||
88691b37 | 1153 | if (!block_job_should_pause(job)) { |
fc24908e | 1154 | block_job_do_yield(job, -1); |
88691b37 | 1155 | } |
88691b37 PB |
1156 | |
1157 | block_job_pause_point(job); | |
1158 | } | |
1159 | ||
2caf63a9 PB |
1160 | void block_job_iostatus_reset(BlockJob *job) |
1161 | { | |
4c241cf5 PB |
1162 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
1163 | return; | |
1164 | } | |
1165 | assert(job->user_paused && job->pause_count > 0); | |
2caf63a9 PB |
1166 | job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
1167 | } | |
1168 | ||
bcada37b | 1169 | void block_job_event_ready(BlockJob *job) |
a66a2a36 | 1170 | { |
c9de4050 | 1171 | block_job_state_transition(job, BLOCK_JOB_STATUS_READY); |
ef6dbf1e HR |
1172 | job->ready = true; |
1173 | ||
559b935f JS |
1174 | if (block_job_is_internal(job)) { |
1175 | return; | |
1176 | } | |
1177 | ||
518848a2 | 1178 | qapi_event_send_block_job_ready(job->driver->job_type, |
8ccb9569 | 1179 | job->id, |
518848a2 MA |
1180 | job->len, |
1181 | job->offset, | |
1182 | job->speed, &error_abort); | |
a66a2a36 PB |
1183 | } |
1184 | ||
81e254dc | 1185 | BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err, |
32c81a4a PB |
1186 | int is_read, int error) |
1187 | { | |
1188 | BlockErrorAction action; | |
1189 | ||
1190 | switch (on_err) { | |
1191 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
8c398252 | 1192 | case BLOCKDEV_ON_ERROR_AUTO: |
a589569f WX |
1193 | action = (error == ENOSPC) ? |
1194 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
32c81a4a PB |
1195 | break; |
1196 | case BLOCKDEV_ON_ERROR_STOP: | |
a589569f | 1197 | action = BLOCK_ERROR_ACTION_STOP; |
32c81a4a PB |
1198 | break; |
1199 | case BLOCKDEV_ON_ERROR_REPORT: | |
a589569f | 1200 | action = BLOCK_ERROR_ACTION_REPORT; |
32c81a4a PB |
1201 | break; |
1202 | case BLOCKDEV_ON_ERROR_IGNORE: | |
a589569f | 1203 | action = BLOCK_ERROR_ACTION_IGNORE; |
32c81a4a PB |
1204 | break; |
1205 | default: | |
1206 | abort(); | |
1207 | } | |
559b935f JS |
1208 | if (!block_job_is_internal(job)) { |
1209 | qapi_event_send_block_job_error(job->id, | |
1210 | is_read ? IO_OPERATION_TYPE_READ : | |
1211 | IO_OPERATION_TYPE_WRITE, | |
1212 | action, &error_abort); | |
1213 | } | |
a589569f | 1214 | if (action == BLOCK_ERROR_ACTION_STOP) { |
0ec4dfb8 | 1215 | block_job_pause(job); |
751ebd76 | 1216 | /* make the pause user visible, which will be resumed from QMP. */ |
0ec4dfb8 | 1217 | job->user_paused = true; |
32c81a4a | 1218 | block_job_iostatus_set_err(job, error); |
32c81a4a PB |
1219 | } |
1220 | return action; | |
1221 | } | |
dec7d421 SH |
1222 | |
1223 | typedef struct { | |
1224 | BlockJob *job; | |
dec7d421 SH |
1225 | AioContext *aio_context; |
1226 | BlockJobDeferToMainLoopFn *fn; | |
1227 | void *opaque; | |
1228 | } BlockJobDeferToMainLoopData; | |
1229 | ||
1230 | static void block_job_defer_to_main_loop_bh(void *opaque) | |
1231 | { | |
1232 | BlockJobDeferToMainLoopData *data = opaque; | |
1233 | AioContext *aio_context; | |
1234 | ||
dec7d421 SH |
1235 | /* Prevent race with block_job_defer_to_main_loop() */ |
1236 | aio_context_acquire(data->aio_context); | |
1237 | ||
1238 | /* Fetch BDS AioContext again, in case it has changed */ | |
b6d2e599 | 1239 | aio_context = blk_get_aio_context(data->job->blk); |
d79df2a2 PB |
1240 | if (aio_context != data->aio_context) { |
1241 | aio_context_acquire(aio_context); | |
1242 | } | |
dec7d421 SH |
1243 | |
1244 | data->fn(data->job, data->opaque); | |
1245 | ||
d79df2a2 PB |
1246 | if (aio_context != data->aio_context) { |
1247 | aio_context_release(aio_context); | |
1248 | } | |
dec7d421 SH |
1249 | |
1250 | aio_context_release(data->aio_context); | |
1251 | ||
1252 | g_free(data); | |
1253 | } | |
1254 | ||
1255 | void block_job_defer_to_main_loop(BlockJob *job, | |
1256 | BlockJobDeferToMainLoopFn *fn, | |
1257 | void *opaque) | |
1258 | { | |
1259 | BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); | |
1260 | data->job = job; | |
b6d2e599 | 1261 | data->aio_context = blk_get_aio_context(job->blk); |
dec7d421 SH |
1262 | data->fn = fn; |
1263 | data->opaque = opaque; | |
794f0141 | 1264 | job->deferred_to_main_loop = true; |
dec7d421 | 1265 | |
fffb6e12 PB |
1266 | aio_bh_schedule_oneshot(qemu_get_aio_context(), |
1267 | block_job_defer_to_main_loop_bh, data); | |
dec7d421 | 1268 | } |