Paolo Bonzini | 2f0c9fe | 2012-09-28 17:22:47 +0200 | [diff] [blame] | 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 | |
Peter Maydell | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 26 | #include "qemu/osdep.h" |
Paolo Bonzini | 2f0c9fe | 2012-09-28 17:22:47 +0200 | [diff] [blame] | 27 | #include "qemu-common.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 28 | #include "block/block.h" |
John Snow | c87621e | 2016-10-27 12:07:00 -0400 | [diff] [blame] | 29 | #include "block/blockjob_int.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 30 | #include "block/block_int.h" |
Max Reitz | 373340b | 2015-10-19 17:53:22 +0200 | [diff] [blame] | 31 | #include "sysemu/block-backend.h" |
Markus Armbruster | cc7a8ea | 2015-03-17 17:22:46 +0100 | [diff] [blame] | 32 | #include "qapi/qmp/qerror.h" |
Paolo Bonzini | 7b1b5d1 | 2012-12-17 18:19:43 +0100 | [diff] [blame] | 33 | #include "qapi/qmp/qjson.h" |
Daniel P. Berrange | 10817bf | 2015-09-01 14:48:02 +0100 | [diff] [blame] | 34 | #include "qemu/coroutine.h" |
Alberto Garcia | 7f0317c | 2016-07-05 17:28:56 +0300 | [diff] [blame] | 35 | #include "qemu/id.h" |
Paolo Bonzini | 2f0c9fe | 2012-09-28 17:22:47 +0200 | [diff] [blame] | 36 | #include "qmp-commands.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 37 | #include "qemu/timer.h" |
Wenchao Xia | 5a2d2cb | 2014-06-18 08:43:45 +0200 | [diff] [blame] | 38 | #include "qapi-event.h" |
Paolo Bonzini | 2f0c9fe | 2012-09-28 17:22:47 +0200 | [diff] [blame] | 39 | |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 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 | |
| 45 | static void block_job_lock(void) |
| 46 | { |
| 47 | qemu_mutex_lock(&block_job_mutex); |
| 48 | } |
| 49 | |
| 50 | static void block_job_unlock(void) |
| 51 | { |
| 52 | qemu_mutex_unlock(&block_job_mutex); |
| 53 | } |
| 54 | |
| 55 | static void __attribute__((__constructor__)) block_job_init(void) |
| 56 | { |
| 57 | qemu_mutex_init(&block_job_mutex); |
| 58 | } |
| 59 | |
John Snow | 8254b6d | 2016-10-27 12:06:58 -0400 | [diff] [blame] | 60 | static void block_job_event_cancelled(BlockJob *job); |
| 61 | static void block_job_event_completed(BlockJob *job, const char *msg); |
| 62 | |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 63 | /* Transactional group of block jobs */ |
| 64 | struct BlockJobTxn { |
| 65 | |
| 66 | /* Is this txn being cancelled? */ |
| 67 | bool aborting; |
| 68 | |
| 69 | /* List of jobs */ |
| 70 | QLIST_HEAD(, BlockJob) jobs; |
| 71 | |
| 72 | /* Reference count */ |
| 73 | int refcnt; |
| 74 | }; |
| 75 | |
Alberto Garcia | a711279 | 2016-04-04 16:43:51 +0300 | [diff] [blame] | 76 | static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs); |
| 77 | |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 78 | /* |
| 79 | * The block job API is composed of two categories of functions. |
| 80 | * |
| 81 | * The first includes functions used by the monitor. The monitor is |
| 82 | * peculiar in that it accesses the block job list with block_job_get, and |
| 83 | * therefore needs consistency across block_job_get and the actual operation |
| 84 | * (e.g. block_job_set_speed). The consistency is achieved with |
| 85 | * aio_context_acquire/release. These functions are declared in blockjob.h. |
| 86 | * |
| 87 | * The second includes functions used by the block job drivers and sometimes |
| 88 | * by the core block layer. These do not care about locking, because the |
| 89 | * whole coroutine runs under the AioContext lock, and are declared in |
| 90 | * blockjob_int.h. |
| 91 | */ |
| 92 | |
Alberto Garcia | a711279 | 2016-04-04 16:43:51 +0300 | [diff] [blame] | 93 | BlockJob *block_job_next(BlockJob *job) |
| 94 | { |
| 95 | if (!job) { |
| 96 | return QLIST_FIRST(&block_jobs); |
| 97 | } |
| 98 | return QLIST_NEXT(job, job_list); |
| 99 | } |
| 100 | |
Alberto Garcia | ffb1f10 | 2016-07-05 17:28:54 +0300 | [diff] [blame] | 101 | BlockJob *block_job_get(const char *id) |
| 102 | { |
| 103 | BlockJob *job; |
| 104 | |
| 105 | QLIST_FOREACH(job, &block_jobs, job_list) { |
John Snow | 559b935 | 2016-10-27 12:06:55 -0400 | [diff] [blame] | 106 | if (job->id && !strcmp(id, job->id)) { |
Alberto Garcia | ffb1f10 | 2016-07-05 17:28:54 +0300 | [diff] [blame] | 107 | return job; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | return NULL; |
| 112 | } |
| 113 | |
Paolo Bonzini | c8ab5c2 | 2017-05-08 16:13:07 +0200 | [diff] [blame] | 114 | BlockJobTxn *block_job_txn_new(void) |
| 115 | { |
| 116 | BlockJobTxn *txn = g_new0(BlockJobTxn, 1); |
| 117 | QLIST_INIT(&txn->jobs); |
| 118 | txn->refcnt = 1; |
| 119 | return txn; |
| 120 | } |
| 121 | |
| 122 | static void block_job_txn_ref(BlockJobTxn *txn) |
| 123 | { |
| 124 | txn->refcnt++; |
| 125 | } |
| 126 | |
| 127 | void block_job_txn_unref(BlockJobTxn *txn) |
| 128 | { |
| 129 | if (txn && --txn->refcnt == 0) { |
| 130 | g_free(txn); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job) |
| 135 | { |
| 136 | if (!txn) { |
| 137 | return; |
| 138 | } |
| 139 | |
| 140 | assert(!job->txn); |
| 141 | job->txn = txn; |
| 142 | |
| 143 | QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); |
| 144 | block_job_txn_ref(txn); |
| 145 | } |
| 146 | |
Paolo Bonzini | f321dcb | 2017-05-08 16:13:03 +0200 | [diff] [blame] | 147 | static void block_job_pause(BlockJob *job) |
| 148 | { |
| 149 | job->pause_count++; |
| 150 | } |
| 151 | |
| 152 | static void block_job_resume(BlockJob *job) |
| 153 | { |
| 154 | assert(job->pause_count > 0); |
| 155 | job->pause_count--; |
| 156 | if (job->pause_count) { |
| 157 | return; |
| 158 | } |
| 159 | block_job_enter(job); |
| 160 | } |
| 161 | |
sochin.jiang | 4172a00 | 2017-06-15 14:47:33 +0800 | [diff] [blame] | 162 | void block_job_ref(BlockJob *job) |
Paolo Bonzini | 05b0d8e | 2017-05-08 16:13:02 +0200 | [diff] [blame] | 163 | { |
| 164 | ++job->refcnt; |
| 165 | } |
| 166 | |
| 167 | static void block_job_attached_aio_context(AioContext *new_context, |
| 168 | void *opaque); |
| 169 | static void block_job_detach_aio_context(void *opaque); |
| 170 | |
sochin.jiang | 4172a00 | 2017-06-15 14:47:33 +0800 | [diff] [blame] | 171 | void block_job_unref(BlockJob *job) |
Paolo Bonzini | 05b0d8e | 2017-05-08 16:13:02 +0200 | [diff] [blame] | 172 | { |
| 173 | if (--job->refcnt == 0) { |
| 174 | BlockDriverState *bs = blk_bs(job->blk); |
Alberto Garcia | 0a3e155 | 2017-11-28 16:53:27 +0200 | [diff] [blame] | 175 | QLIST_REMOVE(job, job_list); |
Paolo Bonzini | 05b0d8e | 2017-05-08 16:13:02 +0200 | [diff] [blame] | 176 | bs->job = NULL; |
| 177 | block_job_remove_all_bdrv(job); |
| 178 | blk_remove_aio_context_notifier(job->blk, |
| 179 | block_job_attached_aio_context, |
| 180 | block_job_detach_aio_context, job); |
| 181 | blk_unref(job->blk); |
| 182 | error_free(job->blocker); |
| 183 | g_free(job->id); |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 184 | assert(!timer_pending(&job->sleep_timer)); |
Paolo Bonzini | 05b0d8e | 2017-05-08 16:13:02 +0200 | [diff] [blame] | 185 | g_free(job); |
| 186 | } |
| 187 | } |
| 188 | |
Stefan Hajnoczi | 463e0be | 2016-06-16 17:56:27 +0100 | [diff] [blame] | 189 | static void block_job_attached_aio_context(AioContext *new_context, |
| 190 | void *opaque) |
| 191 | { |
| 192 | BlockJob *job = opaque; |
| 193 | |
| 194 | if (job->driver->attached_aio_context) { |
| 195 | job->driver->attached_aio_context(job, new_context); |
| 196 | } |
| 197 | |
| 198 | block_job_resume(job); |
| 199 | } |
| 200 | |
Paolo Bonzini | bae8196 | 2016-10-27 12:48:50 +0200 | [diff] [blame] | 201 | static void block_job_drain(BlockJob *job) |
| 202 | { |
| 203 | /* If job is !job->busy this kicks it into the next pause point. */ |
| 204 | block_job_enter(job); |
| 205 | |
| 206 | blk_drain(job->blk); |
| 207 | if (job->driver->drain) { |
| 208 | job->driver->drain(job); |
| 209 | } |
| 210 | } |
| 211 | |
Stefan Hajnoczi | 463e0be | 2016-06-16 17:56:27 +0100 | [diff] [blame] | 212 | static void block_job_detach_aio_context(void *opaque) |
| 213 | { |
| 214 | BlockJob *job = opaque; |
| 215 | |
| 216 | /* In case the job terminates during aio_poll()... */ |
| 217 | block_job_ref(job); |
| 218 | |
| 219 | block_job_pause(job); |
| 220 | |
Stefan Hajnoczi | 463e0be | 2016-06-16 17:56:27 +0100 | [diff] [blame] | 221 | while (!job->paused && !job->completed) { |
Paolo Bonzini | bae8196 | 2016-10-27 12:48:50 +0200 | [diff] [blame] | 222 | block_job_drain(job); |
Stefan Hajnoczi | 463e0be | 2016-06-16 17:56:27 +0100 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | block_job_unref(job); |
| 226 | } |
| 227 | |
Paolo Bonzini | f321dcb | 2017-05-08 16:13:03 +0200 | [diff] [blame] | 228 | static char *child_job_get_parent_desc(BdrvChild *c) |
| 229 | { |
| 230 | BlockJob *job = c->opaque; |
| 231 | return g_strdup_printf("%s job '%s'", |
Markus Armbruster | 977c736 | 2017-08-24 10:46:08 +0200 | [diff] [blame] | 232 | BlockJobType_str(job->driver->job_type), |
Paolo Bonzini | f321dcb | 2017-05-08 16:13:03 +0200 | [diff] [blame] | 233 | job->id); |
| 234 | } |
| 235 | |
| 236 | static const BdrvChildRole child_job = { |
| 237 | .get_parent_desc = child_job_get_parent_desc, |
| 238 | .stay_at_node = true, |
| 239 | }; |
| 240 | |
| 241 | static void block_job_drained_begin(void *opaque) |
| 242 | { |
| 243 | BlockJob *job = opaque; |
| 244 | block_job_pause(job); |
| 245 | } |
| 246 | |
| 247 | static void block_job_drained_end(void *opaque) |
| 248 | { |
| 249 | BlockJob *job = opaque; |
| 250 | block_job_resume(job); |
| 251 | } |
| 252 | |
| 253 | static const BlockDevOps block_job_dev_ops = { |
| 254 | .drained_begin = block_job_drained_begin, |
| 255 | .drained_end = block_job_drained_end, |
| 256 | }; |
| 257 | |
Kevin Wolf | bbc02b9 | 2017-02-28 12:45:58 +0100 | [diff] [blame] | 258 | void block_job_remove_all_bdrv(BlockJob *job) |
| 259 | { |
| 260 | GSList *l; |
| 261 | for (l = job->nodes; l; l = l->next) { |
| 262 | BdrvChild *c = l->data; |
| 263 | bdrv_op_unblock_all(c->bs, job->blocker); |
| 264 | bdrv_root_unref_child(c); |
| 265 | } |
| 266 | g_slist_free(job->nodes); |
| 267 | job->nodes = NULL; |
| 268 | } |
| 269 | |
Kevin Wolf | 76d554e | 2017-01-17 11:56:42 +0100 | [diff] [blame] | 270 | int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs, |
| 271 | uint64_t perm, uint64_t shared_perm, Error **errp) |
Alberto Garcia | 23d402d | 2016-10-28 10:08:04 +0300 | [diff] [blame] | 272 | { |
Kevin Wolf | 76d554e | 2017-01-17 11:56:42 +0100 | [diff] [blame] | 273 | BdrvChild *c; |
| 274 | |
| 275 | c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm, |
| 276 | job, errp); |
| 277 | if (c == NULL) { |
| 278 | return -EPERM; |
| 279 | } |
| 280 | |
| 281 | job->nodes = g_slist_prepend(job->nodes, c); |
Alberto Garcia | 23d402d | 2016-10-28 10:08:04 +0300 | [diff] [blame] | 282 | bdrv_ref(bs); |
| 283 | bdrv_op_block_all(bs, job->blocker); |
Kevin Wolf | 76d554e | 2017-01-17 11:56:42 +0100 | [diff] [blame] | 284 | |
| 285 | return 0; |
Alberto Garcia | 23d402d | 2016-10-28 10:08:04 +0300 | [diff] [blame] | 286 | } |
| 287 | |
John Snow | 559b935 | 2016-10-27 12:06:55 -0400 | [diff] [blame] | 288 | bool block_job_is_internal(BlockJob *job) |
| 289 | { |
| 290 | return (job->id == NULL); |
| 291 | } |
| 292 | |
John Snow | 5ccac6f | 2016-11-08 01:50:37 -0500 | [diff] [blame] | 293 | static bool block_job_started(BlockJob *job) |
| 294 | { |
| 295 | return job->co; |
| 296 | } |
| 297 | |
John Snow | e3796a2 | 2017-03-16 17:23:49 -0400 | [diff] [blame] | 298 | /** |
| 299 | * All jobs must allow a pause point before entering their job proper. This |
| 300 | * ensures that jobs can be paused prior to being started, then resumed later. |
| 301 | */ |
| 302 | static void coroutine_fn block_job_co_entry(void *opaque) |
| 303 | { |
| 304 | BlockJob *job = opaque; |
| 305 | |
| 306 | assert(job && job->driver && job->driver->start); |
| 307 | block_job_pause_point(job); |
| 308 | job->driver->start(job); |
| 309 | } |
| 310 | |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 311 | static void block_job_sleep_timer_cb(void *opaque) |
| 312 | { |
| 313 | BlockJob *job = opaque; |
| 314 | |
| 315 | block_job_enter(job); |
| 316 | } |
| 317 | |
John Snow | 5ccac6f | 2016-11-08 01:50:37 -0500 | [diff] [blame] | 318 | void block_job_start(BlockJob *job) |
| 319 | { |
| 320 | assert(job && !block_job_started(job) && job->paused && |
John Snow | e3796a2 | 2017-03-16 17:23:49 -0400 | [diff] [blame] | 321 | job->driver && job->driver->start); |
| 322 | job->co = qemu_coroutine_create(block_job_co_entry, job); |
| 323 | job->pause_count--; |
| 324 | job->busy = true; |
| 325 | job->paused = false; |
Fam Zheng | aef4278 | 2017-04-10 20:12:05 +0800 | [diff] [blame] | 326 | bdrv_coroutine_enter(blk_bs(job->blk), job->co); |
John Snow | 5ccac6f | 2016-11-08 01:50:37 -0500 | [diff] [blame] | 327 | } |
| 328 | |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 329 | static void block_job_completed_single(BlockJob *job) |
| 330 | { |
Paolo Bonzini | 4fb588e | 2017-05-08 16:13:09 +0200 | [diff] [blame] | 331 | assert(job->completed); |
| 332 | |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 333 | if (!job->ret) { |
| 334 | if (job->driver->commit) { |
| 335 | job->driver->commit(job); |
| 336 | } |
| 337 | } else { |
| 338 | if (job->driver->abort) { |
| 339 | job->driver->abort(job); |
| 340 | } |
| 341 | } |
John Snow | e8a40bf | 2016-11-08 01:50:35 -0500 | [diff] [blame] | 342 | if (job->driver->clean) { |
| 343 | job->driver->clean(job); |
| 344 | } |
John Snow | 8254b6d | 2016-10-27 12:06:58 -0400 | [diff] [blame] | 345 | |
| 346 | if (job->cb) { |
| 347 | job->cb(job->opaque, job->ret); |
| 348 | } |
John Snow | 5ccac6f | 2016-11-08 01:50:37 -0500 | [diff] [blame] | 349 | |
| 350 | /* Emit events only if we actually started */ |
| 351 | if (block_job_started(job)) { |
| 352 | if (block_job_is_cancelled(job)) { |
| 353 | block_job_event_cancelled(job); |
| 354 | } else { |
| 355 | const char *msg = NULL; |
| 356 | if (job->ret < 0) { |
| 357 | msg = strerror(-job->ret); |
| 358 | } |
| 359 | block_job_event_completed(job, msg); |
John Snow | 8254b6d | 2016-10-27 12:06:58 -0400 | [diff] [blame] | 360 | } |
John Snow | 8254b6d | 2016-10-27 12:06:58 -0400 | [diff] [blame] | 361 | } |
| 362 | |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 363 | if (job->txn) { |
Vladimir Sementsov-Ogievskiy | 1e93b9f | 2016-11-08 01:50:34 -0500 | [diff] [blame] | 364 | QLIST_REMOVE(job, txn_list); |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 365 | block_job_txn_unref(job->txn); |
| 366 | } |
| 367 | block_job_unref(job); |
| 368 | } |
| 369 | |
Paolo Bonzini | 4c241cf | 2017-05-08 16:13:06 +0200 | [diff] [blame] | 370 | static void block_job_cancel_async(BlockJob *job) |
| 371 | { |
| 372 | if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) { |
| 373 | block_job_iostatus_reset(job); |
| 374 | } |
| 375 | if (job->user_paused) { |
| 376 | /* Do not call block_job_enter here, the caller will handle it. */ |
| 377 | job->user_paused = false; |
| 378 | job->pause_count--; |
| 379 | } |
| 380 | job->cancelled = true; |
| 381 | } |
| 382 | |
Paolo Bonzini | c8ab5c2 | 2017-05-08 16:13:07 +0200 | [diff] [blame] | 383 | static int block_job_finish_sync(BlockJob *job, |
| 384 | void (*finish)(BlockJob *, Error **errp), |
| 385 | Error **errp) |
| 386 | { |
| 387 | Error *local_err = NULL; |
| 388 | int ret; |
| 389 | |
| 390 | assert(blk_bs(job->blk)->job == job); |
| 391 | |
| 392 | block_job_ref(job); |
| 393 | |
Paolo Bonzini | 4fb588e | 2017-05-08 16:13:09 +0200 | [diff] [blame] | 394 | if (finish) { |
| 395 | finish(job, &local_err); |
| 396 | } |
Paolo Bonzini | c8ab5c2 | 2017-05-08 16:13:07 +0200 | [diff] [blame] | 397 | if (local_err) { |
| 398 | error_propagate(errp, local_err); |
| 399 | block_job_unref(job); |
| 400 | return -EBUSY; |
| 401 | } |
| 402 | /* block_job_drain calls block_job_enter, and it should be enough to |
| 403 | * induce progress until the job completes or moves to the main thread. |
| 404 | */ |
| 405 | while (!job->deferred_to_main_loop && !job->completed) { |
| 406 | block_job_drain(job); |
| 407 | } |
| 408 | while (!job->completed) { |
| 409 | aio_poll(qemu_get_aio_context(), true); |
| 410 | } |
| 411 | ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret; |
| 412 | block_job_unref(job); |
| 413 | return ret; |
| 414 | } |
| 415 | |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 416 | static void block_job_completed_txn_abort(BlockJob *job) |
| 417 | { |
| 418 | AioContext *ctx; |
| 419 | BlockJobTxn *txn = job->txn; |
Paolo Bonzini | 4fb588e | 2017-05-08 16:13:09 +0200 | [diff] [blame] | 420 | BlockJob *other_job; |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 421 | |
| 422 | if (txn->aborting) { |
| 423 | /* |
| 424 | * We are cancelled by another job, which will handle everything. |
| 425 | */ |
| 426 | return; |
| 427 | } |
| 428 | txn->aborting = true; |
Paolo Bonzini | 4fb588e | 2017-05-08 16:13:09 +0200 | [diff] [blame] | 429 | block_job_txn_ref(txn); |
| 430 | |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 431 | /* We are the first failed job. Cancel other jobs. */ |
| 432 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { |
Kevin Wolf | b6d2e59 | 2016-04-08 14:51:09 +0200 | [diff] [blame] | 433 | ctx = blk_get_aio_context(other_job->blk); |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 434 | aio_context_acquire(ctx); |
| 435 | } |
Paolo Bonzini | 4fb588e | 2017-05-08 16:13:09 +0200 | [diff] [blame] | 436 | |
| 437 | /* Other jobs are effectively cancelled by us, set the status for |
| 438 | * them; this job, however, may or may not be cancelled, depending |
| 439 | * on the caller, so leave it. */ |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 440 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { |
Paolo Bonzini | 4fb588e | 2017-05-08 16:13:09 +0200 | [diff] [blame] | 441 | if (other_job != job) { |
| 442 | block_job_cancel_async(other_job); |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 443 | } |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 444 | } |
Paolo Bonzini | 4fb588e | 2017-05-08 16:13:09 +0200 | [diff] [blame] | 445 | while (!QLIST_EMPTY(&txn->jobs)) { |
| 446 | other_job = QLIST_FIRST(&txn->jobs); |
Kevin Wolf | b6d2e59 | 2016-04-08 14:51:09 +0200 | [diff] [blame] | 447 | ctx = blk_get_aio_context(other_job->blk); |
Paolo Bonzini | 4fb588e | 2017-05-08 16:13:09 +0200 | [diff] [blame] | 448 | if (!other_job->completed) { |
| 449 | assert(other_job->cancelled); |
| 450 | block_job_finish_sync(other_job, NULL, NULL); |
| 451 | } |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 452 | block_job_completed_single(other_job); |
| 453 | aio_context_release(ctx); |
| 454 | } |
Paolo Bonzini | 4fb588e | 2017-05-08 16:13:09 +0200 | [diff] [blame] | 455 | |
| 456 | block_job_txn_unref(txn); |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | static void block_job_completed_txn_success(BlockJob *job) |
| 460 | { |
| 461 | AioContext *ctx; |
| 462 | BlockJobTxn *txn = job->txn; |
| 463 | BlockJob *other_job, *next; |
| 464 | /* |
| 465 | * Successful completion, see if there are other running jobs in this |
| 466 | * txn. |
| 467 | */ |
| 468 | QLIST_FOREACH(other_job, &txn->jobs, txn_list) { |
| 469 | if (!other_job->completed) { |
| 470 | return; |
| 471 | } |
| 472 | } |
| 473 | /* We are the last completed job, commit the transaction. */ |
| 474 | QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { |
Kevin Wolf | b6d2e59 | 2016-04-08 14:51:09 +0200 | [diff] [blame] | 475 | ctx = blk_get_aio_context(other_job->blk); |
Fam Zheng | c55a832 | 2015-11-05 18:13:15 -0500 | [diff] [blame] | 476 | aio_context_acquire(ctx); |
| 477 | assert(other_job->ret == 0); |
| 478 | block_job_completed_single(other_job); |
| 479 | aio_context_release(ctx); |
| 480 | } |
| 481 | } |
| 482 | |
Paolo Bonzini | 2f0c9fe | 2012-09-28 17:22:47 +0200 | [diff] [blame] | 483 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
| 484 | { |
| 485 | Error *local_err = NULL; |
| 486 | |
Fam Zheng | 3fc4b10 | 2013-10-08 17:29:38 +0800 | [diff] [blame] | 487 | if (!job->driver->set_speed) { |
Markus Armbruster | c6bd8c7 | 2015-03-17 11:54:50 +0100 | [diff] [blame] | 488 | error_setg(errp, QERR_UNSUPPORTED); |
Paolo Bonzini | 2f0c9fe | 2012-09-28 17:22:47 +0200 | [diff] [blame] | 489 | return; |
| 490 | } |
Fam Zheng | 3fc4b10 | 2013-10-08 17:29:38 +0800 | [diff] [blame] | 491 | job->driver->set_speed(job, speed, &local_err); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 492 | if (local_err) { |
Paolo Bonzini | 2f0c9fe | 2012-09-28 17:22:47 +0200 | [diff] [blame] | 493 | error_propagate(errp, local_err); |
| 494 | return; |
| 495 | } |
| 496 | |
| 497 | job->speed = speed; |
| 498 | } |
| 499 | |
Paolo Bonzini | aeae883 | 2012-10-18 16:49:21 +0200 | [diff] [blame] | 500 | void block_job_complete(BlockJob *job, Error **errp) |
| 501 | { |
John Snow | 559b935 | 2016-10-27 12:06:55 -0400 | [diff] [blame] | 502 | /* Should not be reachable via external interface for internal jobs */ |
| 503 | assert(job->id); |
John Snow | 5ccac6f | 2016-11-08 01:50:37 -0500 | [diff] [blame] | 504 | if (job->pause_count || job->cancelled || |
| 505 | !block_job_started(job) || !job->driver->complete) { |
Alberto Garcia | 9df229c | 2016-07-05 17:28:53 +0300 | [diff] [blame] | 506 | error_setg(errp, "The active block job '%s' cannot be completed", |
| 507 | job->id); |
Paolo Bonzini | aeae883 | 2012-10-18 16:49:21 +0200 | [diff] [blame] | 508 | return; |
| 509 | } |
| 510 | |
Fam Zheng | 3fc4b10 | 2013-10-08 17:29:38 +0800 | [diff] [blame] | 511 | job->driver->complete(job, errp); |
Paolo Bonzini | aeae883 | 2012-10-18 16:49:21 +0200 | [diff] [blame] | 512 | } |
| 513 | |
John Snow | 0df4ba5 | 2016-10-27 12:06:59 -0400 | [diff] [blame] | 514 | void block_job_user_pause(BlockJob *job) |
| 515 | { |
| 516 | job->user_paused = true; |
| 517 | block_job_pause(job); |
| 518 | } |
| 519 | |
John Snow | 0df4ba5 | 2016-10-27 12:06:59 -0400 | [diff] [blame] | 520 | bool block_job_user_paused(BlockJob *job) |
| 521 | { |
Paolo Bonzini | 6573d9c | 2017-05-08 16:13:00 +0200 | [diff] [blame] | 522 | return job->user_paused; |
John Snow | 0df4ba5 | 2016-10-27 12:06:59 -0400 | [diff] [blame] | 523 | } |
| 524 | |
John Snow | 0df4ba5 | 2016-10-27 12:06:59 -0400 | [diff] [blame] | 525 | void block_job_user_resume(BlockJob *job) |
| 526 | { |
| 527 | if (job && job->user_paused && job->pause_count > 0) { |
Paolo Bonzini | 2caf63a | 2017-05-08 16:13:05 +0200 | [diff] [blame] | 528 | block_job_iostatus_reset(job); |
Paolo Bonzini | 4c241cf | 2017-05-08 16:13:06 +0200 | [diff] [blame] | 529 | job->user_paused = false; |
John Snow | 0df4ba5 | 2016-10-27 12:06:59 -0400 | [diff] [blame] | 530 | block_job_resume(job); |
| 531 | } |
| 532 | } |
| 533 | |
Paolo Bonzini | 8acc72a | 2012-09-28 17:22:50 +0200 | [diff] [blame] | 534 | void block_job_cancel(BlockJob *job) |
| 535 | { |
John Snow | 5ccac6f | 2016-11-08 01:50:37 -0500 | [diff] [blame] | 536 | if (block_job_started(job)) { |
Paolo Bonzini | 4c241cf | 2017-05-08 16:13:06 +0200 | [diff] [blame] | 537 | block_job_cancel_async(job); |
John Snow | 5ccac6f | 2016-11-08 01:50:37 -0500 | [diff] [blame] | 538 | block_job_enter(job); |
| 539 | } else { |
| 540 | block_job_completed(job, -ECANCELED); |
| 541 | } |
Paolo Bonzini | 8acc72a | 2012-09-28 17:22:50 +0200 | [diff] [blame] | 542 | } |
| 543 | |
Max Reitz | 345f9e1 | 2014-10-24 15:57:33 +0200 | [diff] [blame] | 544 | /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be |
| 545 | * used with block_job_finish_sync() without the need for (rather nasty) |
| 546 | * function pointer casts there. */ |
| 547 | static void block_job_cancel_err(BlockJob *job, Error **errp) |
| 548 | { |
| 549 | block_job_cancel(job); |
| 550 | } |
| 551 | |
| 552 | int block_job_cancel_sync(BlockJob *job) |
| 553 | { |
| 554 | return block_job_finish_sync(job, &block_job_cancel_err, NULL); |
| 555 | } |
| 556 | |
Kevin Wolf | a1a2af0 | 2016-04-08 18:26:37 +0200 | [diff] [blame] | 557 | void block_job_cancel_sync_all(void) |
| 558 | { |
| 559 | BlockJob *job; |
| 560 | AioContext *aio_context; |
| 561 | |
| 562 | while ((job = QLIST_FIRST(&block_jobs))) { |
Kevin Wolf | b6d2e59 | 2016-04-08 14:51:09 +0200 | [diff] [blame] | 563 | aio_context = blk_get_aio_context(job->blk); |
Kevin Wolf | a1a2af0 | 2016-04-08 18:26:37 +0200 | [diff] [blame] | 564 | aio_context_acquire(aio_context); |
| 565 | block_job_cancel_sync(job); |
| 566 | aio_context_release(aio_context); |
| 567 | } |
| 568 | } |
| 569 | |
Max Reitz | 345f9e1 | 2014-10-24 15:57:33 +0200 | [diff] [blame] | 570 | int block_job_complete_sync(BlockJob *job, Error **errp) |
| 571 | { |
| 572 | return block_job_finish_sync(job, &block_job_complete, errp); |
| 573 | } |
| 574 | |
John Snow | 559b935 | 2016-10-27 12:06:55 -0400 | [diff] [blame] | 575 | BlockJobInfo *block_job_query(BlockJob *job, Error **errp) |
Paolo Bonzini | 30e628b | 2012-09-28 17:22:48 +0200 | [diff] [blame] | 576 | { |
John Snow | 559b935 | 2016-10-27 12:06:55 -0400 | [diff] [blame] | 577 | BlockJobInfo *info; |
| 578 | |
| 579 | if (block_job_is_internal(job)) { |
| 580 | error_setg(errp, "Cannot query QEMU internal jobs"); |
| 581 | return NULL; |
| 582 | } |
| 583 | info = g_new0(BlockJobInfo, 1); |
Markus Armbruster | 977c736 | 2017-08-24 10:46:08 +0200 | [diff] [blame] | 584 | info->type = g_strdup(BlockJobType_str(job->driver->job_type)); |
Kevin Wolf | 8ccb956 | 2015-09-16 13:34:54 +0200 | [diff] [blame] | 585 | info->device = g_strdup(job->id); |
Paolo Bonzini | 32c81a4 | 2012-09-28 17:22:58 +0200 | [diff] [blame] | 586 | info->len = job->len; |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 587 | info->busy = atomic_read(&job->busy); |
Fam Zheng | 751ebd7 | 2015-04-03 22:05:18 +0800 | [diff] [blame] | 588 | info->paused = job->pause_count > 0; |
Paolo Bonzini | 32c81a4 | 2012-09-28 17:22:58 +0200 | [diff] [blame] | 589 | info->offset = job->offset; |
| 590 | info->speed = job->speed; |
| 591 | info->io_status = job->iostatus; |
Max Reitz | ef6dbf1 | 2014-10-24 15:57:34 +0200 | [diff] [blame] | 592 | info->ready = job->ready; |
Paolo Bonzini | 30e628b | 2012-09-28 17:22:48 +0200 | [diff] [blame] | 593 | return info; |
| 594 | } |
Paolo Bonzini | 32c81a4 | 2012-09-28 17:22:58 +0200 | [diff] [blame] | 595 | |
| 596 | static void block_job_iostatus_set_err(BlockJob *job, int error) |
| 597 | { |
| 598 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
| 599 | job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
| 600 | BLOCK_DEVICE_IO_STATUS_FAILED; |
| 601 | } |
| 602 | } |
| 603 | |
John Snow | 8254b6d | 2016-10-27 12:06:58 -0400 | [diff] [blame] | 604 | static void block_job_event_cancelled(BlockJob *job) |
Paolo Bonzini | a66a2a3 | 2012-07-23 15:15:47 +0200 | [diff] [blame] | 605 | { |
John Snow | 559b935 | 2016-10-27 12:06:55 -0400 | [diff] [blame] | 606 | if (block_job_is_internal(job)) { |
| 607 | return; |
| 608 | } |
| 609 | |
Wenchao Xia | bcada37b | 2014-06-18 08:43:47 +0200 | [diff] [blame] | 610 | qapi_event_send_block_job_cancelled(job->driver->job_type, |
Kevin Wolf | 8ccb956 | 2015-09-16 13:34:54 +0200 | [diff] [blame] | 611 | job->id, |
Wenchao Xia | bcada37b | 2014-06-18 08:43:47 +0200 | [diff] [blame] | 612 | job->len, |
| 613 | job->offset, |
| 614 | job->speed, |
| 615 | &error_abort); |
Paolo Bonzini | a66a2a3 | 2012-07-23 15:15:47 +0200 | [diff] [blame] | 616 | } |
| 617 | |
John Snow | 8254b6d | 2016-10-27 12:06:58 -0400 | [diff] [blame] | 618 | static void block_job_event_completed(BlockJob *job, const char *msg) |
Paolo Bonzini | a66a2a3 | 2012-07-23 15:15:47 +0200 | [diff] [blame] | 619 | { |
John Snow | 559b935 | 2016-10-27 12:06:55 -0400 | [diff] [blame] | 620 | if (block_job_is_internal(job)) { |
| 621 | return; |
| 622 | } |
| 623 | |
Wenchao Xia | bcada37b | 2014-06-18 08:43:47 +0200 | [diff] [blame] | 624 | qapi_event_send_block_job_completed(job->driver->job_type, |
Kevin Wolf | 8ccb956 | 2015-09-16 13:34:54 +0200 | [diff] [blame] | 625 | job->id, |
Wenchao Xia | bcada37b | 2014-06-18 08:43:47 +0200 | [diff] [blame] | 626 | job->len, |
| 627 | job->offset, |
| 628 | job->speed, |
| 629 | !!msg, |
| 630 | msg, |
| 631 | &error_abort); |
| 632 | } |
| 633 | |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 634 | /* |
| 635 | * API for block job drivers and the block layer. These functions are |
| 636 | * declared in blockjob_int.h. |
| 637 | */ |
| 638 | |
| 639 | void *block_job_create(const char *job_id, const BlockJobDriver *driver, |
| 640 | BlockDriverState *bs, uint64_t perm, |
| 641 | uint64_t shared_perm, int64_t speed, int flags, |
| 642 | BlockCompletionFunc *cb, void *opaque, Error **errp) |
| 643 | { |
| 644 | BlockBackend *blk; |
| 645 | BlockJob *job; |
| 646 | int ret; |
| 647 | |
| 648 | if (bs->job) { |
| 649 | error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); |
| 650 | return NULL; |
| 651 | } |
| 652 | |
| 653 | if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) { |
| 654 | job_id = bdrv_get_device_name(bs); |
| 655 | if (!*job_id) { |
| 656 | error_setg(errp, "An explicit job ID is required for this node"); |
| 657 | return NULL; |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | if (job_id) { |
| 662 | if (flags & BLOCK_JOB_INTERNAL) { |
| 663 | error_setg(errp, "Cannot specify job ID for internal block job"); |
| 664 | return NULL; |
| 665 | } |
| 666 | |
| 667 | if (!id_wellformed(job_id)) { |
| 668 | error_setg(errp, "Invalid job ID '%s'", job_id); |
| 669 | return NULL; |
| 670 | } |
| 671 | |
| 672 | if (block_job_get(job_id)) { |
| 673 | error_setg(errp, "Job ID '%s' already in use", job_id); |
| 674 | return NULL; |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | blk = blk_new(perm, shared_perm); |
| 679 | ret = blk_insert_bs(blk, bs, errp); |
| 680 | if (ret < 0) { |
| 681 | blk_unref(blk); |
| 682 | return NULL; |
| 683 | } |
| 684 | |
| 685 | job = g_malloc0(driver->instance_size); |
| 686 | job->driver = driver; |
| 687 | job->id = g_strdup(job_id); |
| 688 | job->blk = blk; |
| 689 | job->cb = cb; |
| 690 | job->opaque = opaque; |
| 691 | job->busy = false; |
| 692 | job->paused = true; |
| 693 | job->pause_count = 1; |
| 694 | job->refcnt = 1; |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 695 | aio_timer_init(qemu_get_aio_context(), &job->sleep_timer, |
| 696 | QEMU_CLOCK_REALTIME, SCALE_NS, |
| 697 | block_job_sleep_timer_cb, job); |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 698 | |
| 699 | error_setg(&job->blocker, "block device is in use by block job: %s", |
Markus Armbruster | 977c736 | 2017-08-24 10:46:08 +0200 | [diff] [blame] | 700 | BlockJobType_str(driver->job_type)); |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 701 | block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort); |
| 702 | bs->job = job; |
| 703 | |
| 704 | blk_set_dev_ops(blk, &block_job_dev_ops, job); |
| 705 | bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); |
| 706 | |
| 707 | QLIST_INSERT_HEAD(&block_jobs, job, job_list); |
| 708 | |
| 709 | blk_add_aio_context_notifier(blk, block_job_attached_aio_context, |
| 710 | block_job_detach_aio_context, job); |
| 711 | |
| 712 | /* Only set speed when necessary to avoid NotSupported error */ |
| 713 | if (speed != 0) { |
| 714 | Error *local_err = NULL; |
| 715 | |
| 716 | block_job_set_speed(job, speed, &local_err); |
| 717 | if (local_err) { |
| 718 | block_job_unref(job); |
| 719 | error_propagate(errp, local_err); |
| 720 | return NULL; |
| 721 | } |
| 722 | } |
| 723 | return job; |
| 724 | } |
| 725 | |
Paolo Bonzini | f321dcb | 2017-05-08 16:13:03 +0200 | [diff] [blame] | 726 | void block_job_pause_all(void) |
| 727 | { |
| 728 | BlockJob *job = NULL; |
| 729 | while ((job = block_job_next(job))) { |
| 730 | AioContext *aio_context = blk_get_aio_context(job->blk); |
| 731 | |
| 732 | aio_context_acquire(aio_context); |
Alberto Garcia | 3d5d319 | 2017-11-29 19:56:34 +0200 | [diff] [blame] | 733 | block_job_ref(job); |
Paolo Bonzini | f321dcb | 2017-05-08 16:13:03 +0200 | [diff] [blame] | 734 | block_job_pause(job); |
| 735 | aio_context_release(aio_context); |
| 736 | } |
| 737 | } |
| 738 | |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 739 | void block_job_early_fail(BlockJob *job) |
| 740 | { |
| 741 | block_job_unref(job); |
| 742 | } |
| 743 | |
| 744 | void block_job_completed(BlockJob *job, int ret) |
| 745 | { |
| 746 | assert(blk_bs(job->blk)->job == job); |
| 747 | assert(!job->completed); |
| 748 | job->completed = true; |
| 749 | job->ret = ret; |
| 750 | if (!job->txn) { |
| 751 | block_job_completed_single(job); |
| 752 | } else if (ret < 0 || block_job_is_cancelled(job)) { |
| 753 | block_job_completed_txn_abort(job); |
| 754 | } else { |
| 755 | block_job_completed_txn_success(job); |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | static bool block_job_should_pause(BlockJob *job) |
| 760 | { |
| 761 | return job->pause_count > 0; |
| 762 | } |
| 763 | |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 764 | /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds. |
| 765 | * Reentering the job coroutine with block_job_enter() before the timer has |
| 766 | * expired is allowed and cancels the timer. |
| 767 | * |
| 768 | * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be |
| 769 | * called explicitly. */ |
| 770 | static void block_job_do_yield(BlockJob *job, uint64_t ns) |
Paolo Bonzini | 356f59b | 2017-11-29 11:25:12 +0100 | [diff] [blame] | 771 | { |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 772 | block_job_lock(); |
| 773 | if (ns != -1) { |
| 774 | timer_mod(&job->sleep_timer, ns); |
| 775 | } |
Paolo Bonzini | 356f59b | 2017-11-29 11:25:12 +0100 | [diff] [blame] | 776 | job->busy = false; |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 777 | block_job_unlock(); |
Paolo Bonzini | 356f59b | 2017-11-29 11:25:12 +0100 | [diff] [blame] | 778 | qemu_coroutine_yield(); |
| 779 | |
| 780 | /* Set by block_job_enter before re-entering the coroutine. */ |
| 781 | assert(job->busy); |
| 782 | } |
| 783 | |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 784 | void coroutine_fn block_job_pause_point(BlockJob *job) |
| 785 | { |
| 786 | assert(job && block_job_started(job)); |
| 787 | |
| 788 | if (!block_job_should_pause(job)) { |
| 789 | return; |
| 790 | } |
| 791 | if (block_job_is_cancelled(job)) { |
| 792 | return; |
| 793 | } |
| 794 | |
| 795 | if (job->driver->pause) { |
| 796 | job->driver->pause(job); |
| 797 | } |
| 798 | |
| 799 | if (block_job_should_pause(job) && !block_job_is_cancelled(job)) { |
| 800 | job->paused = true; |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 801 | block_job_do_yield(job, -1); |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 802 | job->paused = false; |
| 803 | } |
| 804 | |
| 805 | if (job->driver->resume) { |
| 806 | job->driver->resume(job); |
| 807 | } |
| 808 | } |
| 809 | |
Paolo Bonzini | f321dcb | 2017-05-08 16:13:03 +0200 | [diff] [blame] | 810 | void block_job_resume_all(void) |
| 811 | { |
Alberto Garcia | 3d5d319 | 2017-11-29 19:56:34 +0200 | [diff] [blame] | 812 | BlockJob *job, *next; |
| 813 | |
| 814 | QLIST_FOREACH_SAFE(job, &block_jobs, job_list, next) { |
Paolo Bonzini | f321dcb | 2017-05-08 16:13:03 +0200 | [diff] [blame] | 815 | AioContext *aio_context = blk_get_aio_context(job->blk); |
| 816 | |
| 817 | aio_context_acquire(aio_context); |
| 818 | block_job_resume(job); |
Alberto Garcia | 3d5d319 | 2017-11-29 19:56:34 +0200 | [diff] [blame] | 819 | block_job_unref(job); |
Paolo Bonzini | f321dcb | 2017-05-08 16:13:03 +0200 | [diff] [blame] | 820 | aio_context_release(aio_context); |
| 821 | } |
| 822 | } |
| 823 | |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 824 | void block_job_enter(BlockJob *job) |
| 825 | { |
Paolo Bonzini | eb05e01 | 2017-05-08 16:13:10 +0200 | [diff] [blame] | 826 | if (!block_job_started(job)) { |
| 827 | return; |
| 828 | } |
| 829 | if (job->deferred_to_main_loop) { |
| 830 | return; |
| 831 | } |
| 832 | |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 833 | block_job_lock(); |
Paolo Bonzini | 356f59b | 2017-11-29 11:25:12 +0100 | [diff] [blame] | 834 | if (job->busy) { |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 835 | block_job_unlock(); |
Paolo Bonzini | 356f59b | 2017-11-29 11:25:12 +0100 | [diff] [blame] | 836 | return; |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 837 | } |
Paolo Bonzini | 356f59b | 2017-11-29 11:25:12 +0100 | [diff] [blame] | 838 | |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 839 | assert(!job->deferred_to_main_loop); |
| 840 | timer_del(&job->sleep_timer); |
Paolo Bonzini | 356f59b | 2017-11-29 11:25:12 +0100 | [diff] [blame] | 841 | job->busy = true; |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 842 | block_job_unlock(); |
Paolo Bonzini | 356f59b | 2017-11-29 11:25:12 +0100 | [diff] [blame] | 843 | aio_co_wake(job->co); |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 844 | } |
| 845 | |
| 846 | bool block_job_is_cancelled(BlockJob *job) |
| 847 | { |
| 848 | return job->cancelled; |
| 849 | } |
| 850 | |
Paolo Bonzini | 5bf1d5a | 2017-11-29 11:25:11 +0100 | [diff] [blame] | 851 | void block_job_sleep_ns(BlockJob *job, int64_t ns) |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 852 | { |
| 853 | assert(job->busy); |
| 854 | |
| 855 | /* Check cancellation *before* setting busy = false, too! */ |
| 856 | if (block_job_is_cancelled(job)) { |
| 857 | return; |
| 858 | } |
| 859 | |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 860 | if (!block_job_should_pause(job)) { |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 861 | block_job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns); |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 862 | } |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 863 | |
| 864 | block_job_pause_point(job); |
| 865 | } |
| 866 | |
| 867 | void block_job_yield(BlockJob *job) |
| 868 | { |
| 869 | assert(job->busy); |
| 870 | |
| 871 | /* Check cancellation *before* setting busy = false, too! */ |
| 872 | if (block_job_is_cancelled(job)) { |
| 873 | return; |
| 874 | } |
| 875 | |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 876 | if (!block_job_should_pause(job)) { |
Paolo Bonzini | fc24908 | 2017-11-29 11:25:13 +0100 | [diff] [blame] | 877 | block_job_do_yield(job, -1); |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 878 | } |
Paolo Bonzini | 88691b3 | 2017-05-08 16:13:04 +0200 | [diff] [blame] | 879 | |
| 880 | block_job_pause_point(job); |
| 881 | } |
| 882 | |
Paolo Bonzini | 2caf63a | 2017-05-08 16:13:05 +0200 | [diff] [blame] | 883 | void block_job_iostatus_reset(BlockJob *job) |
| 884 | { |
Paolo Bonzini | 4c241cf | 2017-05-08 16:13:06 +0200 | [diff] [blame] | 885 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
| 886 | return; |
| 887 | } |
| 888 | assert(job->user_paused && job->pause_count > 0); |
Paolo Bonzini | 2caf63a | 2017-05-08 16:13:05 +0200 | [diff] [blame] | 889 | job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
| 890 | } |
| 891 | |
Wenchao Xia | bcada37b | 2014-06-18 08:43:47 +0200 | [diff] [blame] | 892 | void block_job_event_ready(BlockJob *job) |
| 893 | { |
Max Reitz | ef6dbf1 | 2014-10-24 15:57:34 +0200 | [diff] [blame] | 894 | job->ready = true; |
| 895 | |
John Snow | 559b935 | 2016-10-27 12:06:55 -0400 | [diff] [blame] | 896 | if (block_job_is_internal(job)) { |
| 897 | return; |
| 898 | } |
| 899 | |
Markus Armbruster | 518848a | 2014-06-27 19:24:13 +0200 | [diff] [blame] | 900 | qapi_event_send_block_job_ready(job->driver->job_type, |
Kevin Wolf | 8ccb956 | 2015-09-16 13:34:54 +0200 | [diff] [blame] | 901 | job->id, |
Markus Armbruster | 518848a | 2014-06-27 19:24:13 +0200 | [diff] [blame] | 902 | job->len, |
| 903 | job->offset, |
| 904 | job->speed, &error_abort); |
Paolo Bonzini | a66a2a3 | 2012-07-23 15:15:47 +0200 | [diff] [blame] | 905 | } |
| 906 | |
Kevin Wolf | 81e254d | 2016-04-18 11:36:38 +0200 | [diff] [blame] | 907 | BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err, |
Paolo Bonzini | 32c81a4 | 2012-09-28 17:22:58 +0200 | [diff] [blame] | 908 | int is_read, int error) |
| 909 | { |
| 910 | BlockErrorAction action; |
| 911 | |
| 912 | switch (on_err) { |
| 913 | case BLOCKDEV_ON_ERROR_ENOSPC: |
Kevin Wolf | 8c39825 | 2016-06-29 17:41:35 +0200 | [diff] [blame] | 914 | case BLOCKDEV_ON_ERROR_AUTO: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 915 | action = (error == ENOSPC) ? |
| 916 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; |
Paolo Bonzini | 32c81a4 | 2012-09-28 17:22:58 +0200 | [diff] [blame] | 917 | break; |
| 918 | case BLOCKDEV_ON_ERROR_STOP: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 919 | action = BLOCK_ERROR_ACTION_STOP; |
Paolo Bonzini | 32c81a4 | 2012-09-28 17:22:58 +0200 | [diff] [blame] | 920 | break; |
| 921 | case BLOCKDEV_ON_ERROR_REPORT: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 922 | action = BLOCK_ERROR_ACTION_REPORT; |
Paolo Bonzini | 32c81a4 | 2012-09-28 17:22:58 +0200 | [diff] [blame] | 923 | break; |
| 924 | case BLOCKDEV_ON_ERROR_IGNORE: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 925 | action = BLOCK_ERROR_ACTION_IGNORE; |
Paolo Bonzini | 32c81a4 | 2012-09-28 17:22:58 +0200 | [diff] [blame] | 926 | break; |
| 927 | default: |
| 928 | abort(); |
| 929 | } |
John Snow | 559b935 | 2016-10-27 12:06:55 -0400 | [diff] [blame] | 930 | if (!block_job_is_internal(job)) { |
| 931 | qapi_event_send_block_job_error(job->id, |
| 932 | is_read ? IO_OPERATION_TYPE_READ : |
| 933 | IO_OPERATION_TYPE_WRITE, |
| 934 | action, &error_abort); |
| 935 | } |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 936 | if (action == BLOCK_ERROR_ACTION_STOP) { |
Fam Zheng | 751ebd7 | 2015-04-03 22:05:18 +0800 | [diff] [blame] | 937 | /* make the pause user visible, which will be resumed from QMP. */ |
John Snow | 0df4ba5 | 2016-10-27 12:06:59 -0400 | [diff] [blame] | 938 | block_job_user_pause(job); |
Paolo Bonzini | 32c81a4 | 2012-09-28 17:22:58 +0200 | [diff] [blame] | 939 | block_job_iostatus_set_err(job, error); |
Paolo Bonzini | 32c81a4 | 2012-09-28 17:22:58 +0200 | [diff] [blame] | 940 | } |
| 941 | return action; |
| 942 | } |
Stefan Hajnoczi | dec7d42 | 2014-10-21 12:03:54 +0100 | [diff] [blame] | 943 | |
| 944 | typedef struct { |
| 945 | BlockJob *job; |
Stefan Hajnoczi | dec7d42 | 2014-10-21 12:03:54 +0100 | [diff] [blame] | 946 | AioContext *aio_context; |
| 947 | BlockJobDeferToMainLoopFn *fn; |
| 948 | void *opaque; |
| 949 | } BlockJobDeferToMainLoopData; |
| 950 | |
| 951 | static void block_job_defer_to_main_loop_bh(void *opaque) |
| 952 | { |
| 953 | BlockJobDeferToMainLoopData *data = opaque; |
| 954 | AioContext *aio_context; |
| 955 | |
Stefan Hajnoczi | dec7d42 | 2014-10-21 12:03:54 +0100 | [diff] [blame] | 956 | /* Prevent race with block_job_defer_to_main_loop() */ |
| 957 | aio_context_acquire(data->aio_context); |
| 958 | |
| 959 | /* Fetch BDS AioContext again, in case it has changed */ |
Kevin Wolf | b6d2e59 | 2016-04-08 14:51:09 +0200 | [diff] [blame] | 960 | aio_context = blk_get_aio_context(data->job->blk); |
Paolo Bonzini | d79df2a | 2017-03-21 18:48:10 +0100 | [diff] [blame] | 961 | if (aio_context != data->aio_context) { |
| 962 | aio_context_acquire(aio_context); |
| 963 | } |
Stefan Hajnoczi | dec7d42 | 2014-10-21 12:03:54 +0100 | [diff] [blame] | 964 | |
| 965 | data->fn(data->job, data->opaque); |
| 966 | |
Paolo Bonzini | d79df2a | 2017-03-21 18:48:10 +0100 | [diff] [blame] | 967 | if (aio_context != data->aio_context) { |
| 968 | aio_context_release(aio_context); |
| 969 | } |
Stefan Hajnoczi | dec7d42 | 2014-10-21 12:03:54 +0100 | [diff] [blame] | 970 | |
| 971 | aio_context_release(data->aio_context); |
| 972 | |
| 973 | g_free(data); |
| 974 | } |
| 975 | |
| 976 | void block_job_defer_to_main_loop(BlockJob *job, |
| 977 | BlockJobDeferToMainLoopFn *fn, |
| 978 | void *opaque) |
| 979 | { |
| 980 | BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); |
| 981 | data->job = job; |
Kevin Wolf | b6d2e59 | 2016-04-08 14:51:09 +0200 | [diff] [blame] | 982 | data->aio_context = blk_get_aio_context(job->blk); |
Stefan Hajnoczi | dec7d42 | 2014-10-21 12:03:54 +0100 | [diff] [blame] | 983 | data->fn = fn; |
| 984 | data->opaque = opaque; |
Fam Zheng | 794f014 | 2016-02-02 10:12:24 +0800 | [diff] [blame] | 985 | job->deferred_to_main_loop = true; |
Stefan Hajnoczi | dec7d42 | 2014-10-21 12:03:54 +0100 | [diff] [blame] | 986 | |
Paolo Bonzini | fffb6e1 | 2016-10-03 18:14:16 +0200 | [diff] [blame] | 987 | aio_bh_schedule_oneshot(qemu_get_aio_context(), |
| 988 | block_job_defer_to_main_loop_bh, data); |
Stefan Hajnoczi | dec7d42 | 2014-10-21 12:03:54 +0100 | [diff] [blame] | 989 | } |