12f0c9fe6SPaolo Bonzini /* 22f0c9fe6SPaolo Bonzini * QEMU System Emulator block driver 32f0c9fe6SPaolo Bonzini * 42f0c9fe6SPaolo Bonzini * Copyright (c) 2011 IBM Corp. 52f0c9fe6SPaolo Bonzini * Copyright (c) 2012 Red Hat, Inc. 62f0c9fe6SPaolo Bonzini * 72f0c9fe6SPaolo Bonzini * Permission is hereby granted, free of charge, to any person obtaining a copy 82f0c9fe6SPaolo Bonzini * of this software and associated documentation files (the "Software"), to deal 92f0c9fe6SPaolo Bonzini * in the Software without restriction, including without limitation the rights 102f0c9fe6SPaolo Bonzini * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 112f0c9fe6SPaolo Bonzini * copies of the Software, and to permit persons to whom the Software is 122f0c9fe6SPaolo Bonzini * furnished to do so, subject to the following conditions: 132f0c9fe6SPaolo Bonzini * 142f0c9fe6SPaolo Bonzini * The above copyright notice and this permission notice shall be included in 152f0c9fe6SPaolo Bonzini * all copies or substantial portions of the Software. 162f0c9fe6SPaolo Bonzini * 172f0c9fe6SPaolo Bonzini * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 182f0c9fe6SPaolo Bonzini * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 192f0c9fe6SPaolo Bonzini * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 202f0c9fe6SPaolo Bonzini * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 212f0c9fe6SPaolo Bonzini * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 222f0c9fe6SPaolo Bonzini * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 232f0c9fe6SPaolo Bonzini * THE SOFTWARE. 242f0c9fe6SPaolo Bonzini */ 252f0c9fe6SPaolo Bonzini 262f0c9fe6SPaolo Bonzini #include "config-host.h" 272f0c9fe6SPaolo Bonzini #include "qemu-common.h" 282f0c9fe6SPaolo Bonzini #include "trace.h" 29737e150eSPaolo Bonzini #include "block/block.h" 30737e150eSPaolo Bonzini #include "block/blockjob.h" 31737e150eSPaolo Bonzini #include "block/block_int.h" 32*cc7a8ea7SMarkus Armbruster #include "qapi/qmp/qerror.h" 337b1b5d19SPaolo Bonzini #include "qapi/qmp/qjson.h" 34737e150eSPaolo Bonzini #include "block/coroutine.h" 352f0c9fe6SPaolo Bonzini #include "qmp-commands.h" 361de7afc9SPaolo Bonzini #include "qemu/timer.h" 375a2d2cbdSWenchao Xia #include "qapi-event.h" 382f0c9fe6SPaolo Bonzini 393fc4b10aSFam Zheng void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs, 40097310b5SMarkus Armbruster int64_t speed, BlockCompletionFunc *cb, 412f0c9fe6SPaolo Bonzini void *opaque, Error **errp) 422f0c9fe6SPaolo Bonzini { 432f0c9fe6SPaolo Bonzini BlockJob *job; 442f0c9fe6SPaolo Bonzini 45628ff683SFam Zheng if (bs->job) { 46c6bd8c70SMarkus Armbruster error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 472f0c9fe6SPaolo Bonzini return NULL; 482f0c9fe6SPaolo Bonzini } 49fa510ebfSFam Zheng bdrv_ref(bs); 503fc4b10aSFam Zheng job = g_malloc0(driver->instance_size); 513718d8abSFam Zheng error_setg(&job->blocker, "block device is in use by block job: %s", 523718d8abSFam Zheng BlockJobType_lookup[driver->job_type]); 533718d8abSFam Zheng bdrv_op_block_all(bs, job->blocker); 54b112a65cSStefan Hajnoczi bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); 553718d8abSFam Zheng 563fc4b10aSFam Zheng job->driver = driver; 572f0c9fe6SPaolo Bonzini job->bs = bs; 582f0c9fe6SPaolo Bonzini job->cb = cb; 592f0c9fe6SPaolo Bonzini job->opaque = opaque; 602f0c9fe6SPaolo Bonzini job->busy = true; 612f0c9fe6SPaolo Bonzini bs->job = job; 622f0c9fe6SPaolo Bonzini 632f0c9fe6SPaolo Bonzini /* Only set speed when necessary to avoid NotSupported error */ 642f0c9fe6SPaolo Bonzini if (speed != 0) { 652f0c9fe6SPaolo Bonzini Error *local_err = NULL; 662f0c9fe6SPaolo Bonzini 672f0c9fe6SPaolo Bonzini block_job_set_speed(job, speed, &local_err); 6884d18f06SMarkus Armbruster if (local_err) { 692f0c9fe6SPaolo Bonzini bs->job = NULL; 703718d8abSFam Zheng bdrv_op_unblock_all(bs, job->blocker); 713718d8abSFam Zheng error_free(job->blocker); 722f0c9fe6SPaolo Bonzini g_free(job); 732f0c9fe6SPaolo Bonzini error_propagate(errp, local_err); 742f0c9fe6SPaolo Bonzini return NULL; 752f0c9fe6SPaolo Bonzini } 762f0c9fe6SPaolo Bonzini } 772f0c9fe6SPaolo Bonzini return job; 782f0c9fe6SPaolo Bonzini } 792f0c9fe6SPaolo Bonzini 8065f46322SPaolo Bonzini void block_job_completed(BlockJob *job, int ret) 812f0c9fe6SPaolo Bonzini { 822f0c9fe6SPaolo Bonzini BlockDriverState *bs = job->bs; 832f0c9fe6SPaolo Bonzini 842f0c9fe6SPaolo Bonzini assert(bs->job == job); 852f0c9fe6SPaolo Bonzini job->cb(job->opaque, ret); 862f0c9fe6SPaolo Bonzini bs->job = NULL; 873718d8abSFam Zheng bdrv_op_unblock_all(bs, job->blocker); 883718d8abSFam Zheng error_free(job->blocker); 892f0c9fe6SPaolo Bonzini g_free(job); 902f0c9fe6SPaolo Bonzini } 912f0c9fe6SPaolo Bonzini 922f0c9fe6SPaolo Bonzini void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) 932f0c9fe6SPaolo Bonzini { 942f0c9fe6SPaolo Bonzini Error *local_err = NULL; 952f0c9fe6SPaolo Bonzini 963fc4b10aSFam Zheng if (!job->driver->set_speed) { 97c6bd8c70SMarkus Armbruster error_setg(errp, QERR_UNSUPPORTED); 982f0c9fe6SPaolo Bonzini return; 992f0c9fe6SPaolo Bonzini } 1003fc4b10aSFam Zheng job->driver->set_speed(job, speed, &local_err); 10184d18f06SMarkus Armbruster if (local_err) { 1022f0c9fe6SPaolo Bonzini error_propagate(errp, local_err); 1032f0c9fe6SPaolo Bonzini return; 1042f0c9fe6SPaolo Bonzini } 1052f0c9fe6SPaolo Bonzini 1062f0c9fe6SPaolo Bonzini job->speed = speed; 1072f0c9fe6SPaolo Bonzini } 1082f0c9fe6SPaolo Bonzini 109aeae883bSPaolo Bonzini void block_job_complete(BlockJob *job, Error **errp) 110aeae883bSPaolo Bonzini { 111751ebd76SFam Zheng if (job->pause_count || job->cancelled || !job->driver->complete) { 112c6bd8c70SMarkus Armbruster error_setg(errp, QERR_BLOCK_JOB_NOT_READY, 113bfb197e0SMarkus Armbruster bdrv_get_device_name(job->bs)); 114aeae883bSPaolo Bonzini return; 115aeae883bSPaolo Bonzini } 116aeae883bSPaolo Bonzini 1173fc4b10aSFam Zheng job->driver->complete(job, errp); 118aeae883bSPaolo Bonzini } 119aeae883bSPaolo Bonzini 1208acc72a4SPaolo Bonzini void block_job_pause(BlockJob *job) 1212f0c9fe6SPaolo Bonzini { 122751ebd76SFam Zheng job->pause_count++; 1238acc72a4SPaolo Bonzini } 1248acc72a4SPaolo Bonzini 1258acc72a4SPaolo Bonzini bool block_job_is_paused(BlockJob *job) 1268acc72a4SPaolo Bonzini { 127751ebd76SFam Zheng return job->pause_count > 0; 1288acc72a4SPaolo Bonzini } 1298acc72a4SPaolo Bonzini 1308acc72a4SPaolo Bonzini void block_job_resume(BlockJob *job) 1318acc72a4SPaolo Bonzini { 132751ebd76SFam Zheng assert(job->pause_count > 0); 133751ebd76SFam Zheng job->pause_count--; 134751ebd76SFam Zheng if (job->pause_count) { 135751ebd76SFam Zheng return; 136751ebd76SFam Zheng } 137751ebd76SFam Zheng block_job_enter(job); 138751ebd76SFam Zheng } 139751ebd76SFam Zheng 140751ebd76SFam Zheng void block_job_enter(BlockJob *job) 141751ebd76SFam Zheng { 14232c81a4aSPaolo Bonzini block_job_iostatus_reset(job); 1432f0c9fe6SPaolo Bonzini if (job->co && !job->busy) { 1442f0c9fe6SPaolo Bonzini qemu_coroutine_enter(job->co, NULL); 1452f0c9fe6SPaolo Bonzini } 1462f0c9fe6SPaolo Bonzini } 1472f0c9fe6SPaolo Bonzini 1488acc72a4SPaolo Bonzini void block_job_cancel(BlockJob *job) 1498acc72a4SPaolo Bonzini { 1508acc72a4SPaolo Bonzini job->cancelled = true; 151751ebd76SFam Zheng block_job_enter(job); 1528acc72a4SPaolo Bonzini } 1538acc72a4SPaolo Bonzini 1542f0c9fe6SPaolo Bonzini bool block_job_is_cancelled(BlockJob *job) 1552f0c9fe6SPaolo Bonzini { 1562f0c9fe6SPaolo Bonzini return job->cancelled; 1572f0c9fe6SPaolo Bonzini } 1582f0c9fe6SPaolo Bonzini 15932c81a4aSPaolo Bonzini void block_job_iostatus_reset(BlockJob *job) 16032c81a4aSPaolo Bonzini { 16132c81a4aSPaolo Bonzini job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; 1623fc4b10aSFam Zheng if (job->driver->iostatus_reset) { 1633fc4b10aSFam Zheng job->driver->iostatus_reset(job); 1643bd293c3SPaolo Bonzini } 16532c81a4aSPaolo Bonzini } 16632c81a4aSPaolo Bonzini 167345f9e1bSMax Reitz struct BlockFinishData { 1682f0c9fe6SPaolo Bonzini BlockJob *job; 169097310b5SMarkus Armbruster BlockCompletionFunc *cb; 1702f0c9fe6SPaolo Bonzini void *opaque; 1712f0c9fe6SPaolo Bonzini bool cancelled; 1722f0c9fe6SPaolo Bonzini int ret; 1732f0c9fe6SPaolo Bonzini }; 1742f0c9fe6SPaolo Bonzini 175345f9e1bSMax Reitz static void block_job_finish_cb(void *opaque, int ret) 1762f0c9fe6SPaolo Bonzini { 177345f9e1bSMax Reitz struct BlockFinishData *data = opaque; 1782f0c9fe6SPaolo Bonzini 1792f0c9fe6SPaolo Bonzini data->cancelled = block_job_is_cancelled(data->job); 1802f0c9fe6SPaolo Bonzini data->ret = ret; 1812f0c9fe6SPaolo Bonzini data->cb(data->opaque, ret); 1822f0c9fe6SPaolo Bonzini } 1832f0c9fe6SPaolo Bonzini 184345f9e1bSMax Reitz static int block_job_finish_sync(BlockJob *job, 185345f9e1bSMax Reitz void (*finish)(BlockJob *, Error **errp), 186345f9e1bSMax Reitz Error **errp) 1872f0c9fe6SPaolo Bonzini { 188345f9e1bSMax Reitz struct BlockFinishData data; 1892f0c9fe6SPaolo Bonzini BlockDriverState *bs = job->bs; 190345f9e1bSMax Reitz Error *local_err = NULL; 1912f0c9fe6SPaolo Bonzini 1922f0c9fe6SPaolo Bonzini assert(bs->job == job); 1932f0c9fe6SPaolo Bonzini 1942f0c9fe6SPaolo Bonzini /* Set up our own callback to store the result and chain to 1952f0c9fe6SPaolo Bonzini * the original callback. 1962f0c9fe6SPaolo Bonzini */ 1972f0c9fe6SPaolo Bonzini data.job = job; 1982f0c9fe6SPaolo Bonzini data.cb = job->cb; 1992f0c9fe6SPaolo Bonzini data.opaque = job->opaque; 2002f0c9fe6SPaolo Bonzini data.ret = -EINPROGRESS; 201345f9e1bSMax Reitz job->cb = block_job_finish_cb; 2022f0c9fe6SPaolo Bonzini job->opaque = &data; 203345f9e1bSMax Reitz finish(job, &local_err); 204345f9e1bSMax Reitz if (local_err) { 205345f9e1bSMax Reitz error_propagate(errp, local_err); 206345f9e1bSMax Reitz return -EBUSY; 207345f9e1bSMax Reitz } 2082f0c9fe6SPaolo Bonzini while (data.ret == -EINPROGRESS) { 209b47ec2c4SPaolo Bonzini aio_poll(bdrv_get_aio_context(bs), true); 2102f0c9fe6SPaolo Bonzini } 2112f0c9fe6SPaolo Bonzini return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret; 2122f0c9fe6SPaolo Bonzini } 2132f0c9fe6SPaolo Bonzini 214345f9e1bSMax Reitz /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be 215345f9e1bSMax Reitz * used with block_job_finish_sync() without the need for (rather nasty) 216345f9e1bSMax Reitz * function pointer casts there. */ 217345f9e1bSMax Reitz static void block_job_cancel_err(BlockJob *job, Error **errp) 218345f9e1bSMax Reitz { 219345f9e1bSMax Reitz block_job_cancel(job); 220345f9e1bSMax Reitz } 221345f9e1bSMax Reitz 222345f9e1bSMax Reitz int block_job_cancel_sync(BlockJob *job) 223345f9e1bSMax Reitz { 224345f9e1bSMax Reitz return block_job_finish_sync(job, &block_job_cancel_err, NULL); 225345f9e1bSMax Reitz } 226345f9e1bSMax Reitz 227345f9e1bSMax Reitz int block_job_complete_sync(BlockJob *job, Error **errp) 228345f9e1bSMax Reitz { 229345f9e1bSMax Reitz return block_job_finish_sync(job, &block_job_complete, errp); 230345f9e1bSMax Reitz } 231345f9e1bSMax Reitz 2327483d1e5SAlex Bligh void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns) 2332f0c9fe6SPaolo Bonzini { 2348acc72a4SPaolo Bonzini assert(job->busy); 2358acc72a4SPaolo Bonzini 2362f0c9fe6SPaolo Bonzini /* Check cancellation *before* setting busy = false, too! */ 2378acc72a4SPaolo Bonzini if (block_job_is_cancelled(job)) { 2388acc72a4SPaolo Bonzini return; 2392f0c9fe6SPaolo Bonzini } 2408acc72a4SPaolo Bonzini 2418acc72a4SPaolo Bonzini job->busy = false; 2428acc72a4SPaolo Bonzini if (block_job_is_paused(job)) { 2438acc72a4SPaolo Bonzini qemu_coroutine_yield(); 2448acc72a4SPaolo Bonzini } else { 2450b9caf9bSFam Zheng co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns); 2468acc72a4SPaolo Bonzini } 2478acc72a4SPaolo Bonzini job->busy = true; 2482f0c9fe6SPaolo Bonzini } 24930e628b7SPaolo Bonzini 250dc71ce45SFam Zheng void block_job_yield(BlockJob *job) 251dc71ce45SFam Zheng { 252dc71ce45SFam Zheng assert(job->busy); 253dc71ce45SFam Zheng 254dc71ce45SFam Zheng /* Check cancellation *before* setting busy = false, too! */ 255dc71ce45SFam Zheng if (block_job_is_cancelled(job)) { 256dc71ce45SFam Zheng return; 257dc71ce45SFam Zheng } 258dc71ce45SFam Zheng 259dc71ce45SFam Zheng job->busy = false; 260dc71ce45SFam Zheng qemu_coroutine_yield(); 261dc71ce45SFam Zheng job->busy = true; 262dc71ce45SFam Zheng } 263dc71ce45SFam Zheng 26430e628b7SPaolo Bonzini BlockJobInfo *block_job_query(BlockJob *job) 26530e628b7SPaolo Bonzini { 26630e628b7SPaolo Bonzini BlockJobInfo *info = g_new0(BlockJobInfo, 1); 26779e14bf7SFam Zheng info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]); 26830e628b7SPaolo Bonzini info->device = g_strdup(bdrv_get_device_name(job->bs)); 26930e628b7SPaolo Bonzini info->len = job->len; 2708d65883fSPaolo Bonzini info->busy = job->busy; 271751ebd76SFam Zheng info->paused = job->pause_count > 0; 27230e628b7SPaolo Bonzini info->offset = job->offset; 27330e628b7SPaolo Bonzini info->speed = job->speed; 27432c81a4aSPaolo Bonzini info->io_status = job->iostatus; 275ef6dbf1eSMax Reitz info->ready = job->ready; 27630e628b7SPaolo Bonzini return info; 27730e628b7SPaolo Bonzini } 27832c81a4aSPaolo Bonzini 27932c81a4aSPaolo Bonzini static void block_job_iostatus_set_err(BlockJob *job, int error) 28032c81a4aSPaolo Bonzini { 28132c81a4aSPaolo Bonzini if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { 28232c81a4aSPaolo Bonzini job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : 28332c81a4aSPaolo Bonzini BLOCK_DEVICE_IO_STATUS_FAILED; 28432c81a4aSPaolo Bonzini } 28532c81a4aSPaolo Bonzini } 28632c81a4aSPaolo Bonzini 287bcada37bSWenchao Xia void block_job_event_cancelled(BlockJob *job) 288a66a2a36SPaolo Bonzini { 289bcada37bSWenchao Xia qapi_event_send_block_job_cancelled(job->driver->job_type, 290a66a2a36SPaolo Bonzini bdrv_get_device_name(job->bs), 291a66a2a36SPaolo Bonzini job->len, 292a66a2a36SPaolo Bonzini job->offset, 293bcada37bSWenchao Xia job->speed, 294bcada37bSWenchao Xia &error_abort); 295a66a2a36SPaolo Bonzini } 296a66a2a36SPaolo Bonzini 297bcada37bSWenchao Xia void block_job_event_completed(BlockJob *job, const char *msg) 298a66a2a36SPaolo Bonzini { 299bcada37bSWenchao Xia qapi_event_send_block_job_completed(job->driver->job_type, 300bcada37bSWenchao Xia bdrv_get_device_name(job->bs), 301bcada37bSWenchao Xia job->len, 302bcada37bSWenchao Xia job->offset, 303bcada37bSWenchao Xia job->speed, 304bcada37bSWenchao Xia !!msg, 305bcada37bSWenchao Xia msg, 306bcada37bSWenchao Xia &error_abort); 307bcada37bSWenchao Xia } 308bcada37bSWenchao Xia 309bcada37bSWenchao Xia void block_job_event_ready(BlockJob *job) 310bcada37bSWenchao Xia { 311ef6dbf1eSMax Reitz job->ready = true; 312ef6dbf1eSMax Reitz 313518848a2SMarkus Armbruster qapi_event_send_block_job_ready(job->driver->job_type, 314518848a2SMarkus Armbruster bdrv_get_device_name(job->bs), 315518848a2SMarkus Armbruster job->len, 316518848a2SMarkus Armbruster job->offset, 317518848a2SMarkus Armbruster job->speed, &error_abort); 318a66a2a36SPaolo Bonzini } 319a66a2a36SPaolo Bonzini 32032c81a4aSPaolo Bonzini BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs, 32132c81a4aSPaolo Bonzini BlockdevOnError on_err, 32232c81a4aSPaolo Bonzini int is_read, int error) 32332c81a4aSPaolo Bonzini { 32432c81a4aSPaolo Bonzini BlockErrorAction action; 32532c81a4aSPaolo Bonzini 32632c81a4aSPaolo Bonzini switch (on_err) { 32732c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_ENOSPC: 328a589569fSWenchao Xia action = (error == ENOSPC) ? 329a589569fSWenchao Xia BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; 33032c81a4aSPaolo Bonzini break; 33132c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_STOP: 332a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_STOP; 33332c81a4aSPaolo Bonzini break; 33432c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_REPORT: 335a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_REPORT; 33632c81a4aSPaolo Bonzini break; 33732c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_IGNORE: 338a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_IGNORE; 33932c81a4aSPaolo Bonzini break; 34032c81a4aSPaolo Bonzini default: 34132c81a4aSPaolo Bonzini abort(); 34232c81a4aSPaolo Bonzini } 343823c6863SMarkus Armbruster qapi_event_send_block_job_error(bdrv_get_device_name(job->bs), 3445a2d2cbdSWenchao Xia is_read ? IO_OPERATION_TYPE_READ : 3455a2d2cbdSWenchao Xia IO_OPERATION_TYPE_WRITE, 3465a2d2cbdSWenchao Xia action, &error_abort); 347a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_STOP) { 348751ebd76SFam Zheng /* make the pause user visible, which will be resumed from QMP. */ 349751ebd76SFam Zheng job->user_paused = true; 35032c81a4aSPaolo Bonzini block_job_pause(job); 35132c81a4aSPaolo Bonzini block_job_iostatus_set_err(job, error); 35232c81a4aSPaolo Bonzini if (bs != job->bs) { 35332c81a4aSPaolo Bonzini bdrv_iostatus_set_err(bs, error); 35432c81a4aSPaolo Bonzini } 35532c81a4aSPaolo Bonzini } 35632c81a4aSPaolo Bonzini return action; 35732c81a4aSPaolo Bonzini } 358dec7d421SStefan Hajnoczi 359dec7d421SStefan Hajnoczi typedef struct { 360dec7d421SStefan Hajnoczi BlockJob *job; 361dec7d421SStefan Hajnoczi QEMUBH *bh; 362dec7d421SStefan Hajnoczi AioContext *aio_context; 363dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopFn *fn; 364dec7d421SStefan Hajnoczi void *opaque; 365dec7d421SStefan Hajnoczi } BlockJobDeferToMainLoopData; 366dec7d421SStefan Hajnoczi 367dec7d421SStefan Hajnoczi static void block_job_defer_to_main_loop_bh(void *opaque) 368dec7d421SStefan Hajnoczi { 369dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopData *data = opaque; 370dec7d421SStefan Hajnoczi AioContext *aio_context; 371dec7d421SStefan Hajnoczi 372dec7d421SStefan Hajnoczi qemu_bh_delete(data->bh); 373dec7d421SStefan Hajnoczi 374dec7d421SStefan Hajnoczi /* Prevent race with block_job_defer_to_main_loop() */ 375dec7d421SStefan Hajnoczi aio_context_acquire(data->aio_context); 376dec7d421SStefan Hajnoczi 377dec7d421SStefan Hajnoczi /* Fetch BDS AioContext again, in case it has changed */ 378dec7d421SStefan Hajnoczi aio_context = bdrv_get_aio_context(data->job->bs); 379dec7d421SStefan Hajnoczi aio_context_acquire(aio_context); 380dec7d421SStefan Hajnoczi 381dec7d421SStefan Hajnoczi data->fn(data->job, data->opaque); 382dec7d421SStefan Hajnoczi 383dec7d421SStefan Hajnoczi aio_context_release(aio_context); 384dec7d421SStefan Hajnoczi 385dec7d421SStefan Hajnoczi aio_context_release(data->aio_context); 386dec7d421SStefan Hajnoczi 387dec7d421SStefan Hajnoczi g_free(data); 388dec7d421SStefan Hajnoczi } 389dec7d421SStefan Hajnoczi 390dec7d421SStefan Hajnoczi void block_job_defer_to_main_loop(BlockJob *job, 391dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopFn *fn, 392dec7d421SStefan Hajnoczi void *opaque) 393dec7d421SStefan Hajnoczi { 394dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); 395dec7d421SStefan Hajnoczi data->job = job; 396dec7d421SStefan Hajnoczi data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data); 397dec7d421SStefan Hajnoczi data->aio_context = bdrv_get_aio_context(job->bs); 398dec7d421SStefan Hajnoczi data->fn = fn; 399dec7d421SStefan Hajnoczi data->opaque = opaque; 400dec7d421SStefan Hajnoczi 401dec7d421SStefan Hajnoczi qemu_bh_schedule(data->bh); 402dec7d421SStefan Hajnoczi } 403