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*373340b2SMax Reitz #include "sysemu/block-backend.h" 33cc7a8ea7SMarkus Armbruster #include "qapi/qmp/qerror.h" 347b1b5d19SPaolo Bonzini #include "qapi/qmp/qjson.h" 3510817bf0SDaniel P. Berrange #include "qemu/coroutine.h" 362f0c9fe6SPaolo Bonzini #include "qmp-commands.h" 371de7afc9SPaolo Bonzini #include "qemu/timer.h" 385a2d2cbdSWenchao Xia #include "qapi-event.h" 392f0c9fe6SPaolo Bonzini 403fc4b10aSFam Zheng void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs, 41097310b5SMarkus Armbruster int64_t speed, BlockCompletionFunc *cb, 422f0c9fe6SPaolo Bonzini void *opaque, Error **errp) 432f0c9fe6SPaolo Bonzini { 442f0c9fe6SPaolo Bonzini BlockJob *job; 452f0c9fe6SPaolo Bonzini 46628ff683SFam Zheng if (bs->job) { 47c6bd8c70SMarkus Armbruster error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 482f0c9fe6SPaolo Bonzini return NULL; 492f0c9fe6SPaolo Bonzini } 50fa510ebfSFam Zheng bdrv_ref(bs); 513fc4b10aSFam Zheng job = g_malloc0(driver->instance_size); 523718d8abSFam Zheng error_setg(&job->blocker, "block device is in use by block job: %s", 533718d8abSFam Zheng BlockJobType_lookup[driver->job_type]); 543718d8abSFam Zheng bdrv_op_block_all(bs, job->blocker); 55b112a65cSStefan Hajnoczi bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); 563718d8abSFam Zheng 573fc4b10aSFam Zheng job->driver = driver; 588ccb9569SKevin Wolf job->id = g_strdup(bdrv_get_device_name(bs)); 592f0c9fe6SPaolo Bonzini job->bs = bs; 602f0c9fe6SPaolo Bonzini job->cb = cb; 612f0c9fe6SPaolo Bonzini job->opaque = opaque; 622f0c9fe6SPaolo Bonzini job->busy = true; 632f0c9fe6SPaolo Bonzini bs->job = job; 642f0c9fe6SPaolo Bonzini 652f0c9fe6SPaolo Bonzini /* Only set speed when necessary to avoid NotSupported error */ 662f0c9fe6SPaolo Bonzini if (speed != 0) { 672f0c9fe6SPaolo Bonzini Error *local_err = NULL; 682f0c9fe6SPaolo Bonzini 692f0c9fe6SPaolo Bonzini block_job_set_speed(job, speed, &local_err); 7084d18f06SMarkus Armbruster if (local_err) { 7197031164STing Wang block_job_release(bs); 722f0c9fe6SPaolo Bonzini error_propagate(errp, local_err); 732f0c9fe6SPaolo Bonzini return NULL; 742f0c9fe6SPaolo Bonzini } 752f0c9fe6SPaolo Bonzini } 762f0c9fe6SPaolo Bonzini return job; 772f0c9fe6SPaolo Bonzini } 782f0c9fe6SPaolo Bonzini 7997031164STing Wang void block_job_release(BlockDriverState *bs) 8097031164STing Wang { 8197031164STing Wang BlockJob *job = bs->job; 8297031164STing Wang 8397031164STing Wang bs->job = NULL; 8497031164STing Wang bdrv_op_unblock_all(bs, job->blocker); 8597031164STing Wang error_free(job->blocker); 868ccb9569SKevin Wolf g_free(job->id); 8797031164STing Wang g_free(job); 8897031164STing Wang } 8997031164STing Wang 9065f46322SPaolo Bonzini void block_job_completed(BlockJob *job, int ret) 912f0c9fe6SPaolo Bonzini { 922f0c9fe6SPaolo Bonzini BlockDriverState *bs = job->bs; 932f0c9fe6SPaolo Bonzini 942f0c9fe6SPaolo Bonzini assert(bs->job == job); 952f0c9fe6SPaolo Bonzini job->cb(job->opaque, ret); 9697031164STing Wang block_job_release(bs); 972f0c9fe6SPaolo Bonzini } 982f0c9fe6SPaolo Bonzini 992f0c9fe6SPaolo Bonzini void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) 1002f0c9fe6SPaolo Bonzini { 1012f0c9fe6SPaolo Bonzini Error *local_err = NULL; 1022f0c9fe6SPaolo Bonzini 1033fc4b10aSFam Zheng if (!job->driver->set_speed) { 104c6bd8c70SMarkus Armbruster error_setg(errp, QERR_UNSUPPORTED); 1052f0c9fe6SPaolo Bonzini return; 1062f0c9fe6SPaolo Bonzini } 1073fc4b10aSFam Zheng job->driver->set_speed(job, speed, &local_err); 10884d18f06SMarkus Armbruster if (local_err) { 1092f0c9fe6SPaolo Bonzini error_propagate(errp, local_err); 1102f0c9fe6SPaolo Bonzini return; 1112f0c9fe6SPaolo Bonzini } 1122f0c9fe6SPaolo Bonzini 1132f0c9fe6SPaolo Bonzini job->speed = speed; 1142f0c9fe6SPaolo Bonzini } 1152f0c9fe6SPaolo Bonzini 116aeae883bSPaolo Bonzini void block_job_complete(BlockJob *job, Error **errp) 117aeae883bSPaolo Bonzini { 118751ebd76SFam Zheng if (job->pause_count || job->cancelled || !job->driver->complete) { 1198ccb9569SKevin Wolf error_setg(errp, QERR_BLOCK_JOB_NOT_READY, job->id); 120aeae883bSPaolo Bonzini return; 121aeae883bSPaolo Bonzini } 122aeae883bSPaolo Bonzini 1233fc4b10aSFam Zheng job->driver->complete(job, errp); 124aeae883bSPaolo Bonzini } 125aeae883bSPaolo Bonzini 1268acc72a4SPaolo Bonzini void block_job_pause(BlockJob *job) 1272f0c9fe6SPaolo Bonzini { 128751ebd76SFam Zheng job->pause_count++; 1298acc72a4SPaolo Bonzini } 1308acc72a4SPaolo Bonzini 1318acc72a4SPaolo Bonzini bool block_job_is_paused(BlockJob *job) 1328acc72a4SPaolo Bonzini { 133751ebd76SFam Zheng return job->pause_count > 0; 1348acc72a4SPaolo Bonzini } 1358acc72a4SPaolo Bonzini 1368acc72a4SPaolo Bonzini void block_job_resume(BlockJob *job) 1378acc72a4SPaolo Bonzini { 138751ebd76SFam Zheng assert(job->pause_count > 0); 139751ebd76SFam Zheng job->pause_count--; 140751ebd76SFam Zheng if (job->pause_count) { 141751ebd76SFam Zheng return; 142751ebd76SFam Zheng } 143751ebd76SFam Zheng block_job_enter(job); 144751ebd76SFam Zheng } 145751ebd76SFam Zheng 146751ebd76SFam Zheng void block_job_enter(BlockJob *job) 147751ebd76SFam Zheng { 14832c81a4aSPaolo Bonzini block_job_iostatus_reset(job); 1492f0c9fe6SPaolo Bonzini if (job->co && !job->busy) { 1502f0c9fe6SPaolo Bonzini qemu_coroutine_enter(job->co, NULL); 1512f0c9fe6SPaolo Bonzini } 1522f0c9fe6SPaolo Bonzini } 1532f0c9fe6SPaolo Bonzini 1548acc72a4SPaolo Bonzini void block_job_cancel(BlockJob *job) 1558acc72a4SPaolo Bonzini { 1568acc72a4SPaolo Bonzini job->cancelled = true; 157751ebd76SFam Zheng block_job_enter(job); 1588acc72a4SPaolo Bonzini } 1598acc72a4SPaolo Bonzini 1602f0c9fe6SPaolo Bonzini bool block_job_is_cancelled(BlockJob *job) 1612f0c9fe6SPaolo Bonzini { 1622f0c9fe6SPaolo Bonzini return job->cancelled; 1632f0c9fe6SPaolo Bonzini } 1642f0c9fe6SPaolo Bonzini 16532c81a4aSPaolo Bonzini void block_job_iostatus_reset(BlockJob *job) 16632c81a4aSPaolo Bonzini { 16732c81a4aSPaolo Bonzini job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; 1683fc4b10aSFam Zheng if (job->driver->iostatus_reset) { 1693fc4b10aSFam Zheng job->driver->iostatus_reset(job); 1703bd293c3SPaolo Bonzini } 17132c81a4aSPaolo Bonzini } 17232c81a4aSPaolo Bonzini 173345f9e1bSMax Reitz struct BlockFinishData { 1742f0c9fe6SPaolo Bonzini BlockJob *job; 175097310b5SMarkus Armbruster BlockCompletionFunc *cb; 1762f0c9fe6SPaolo Bonzini void *opaque; 1772f0c9fe6SPaolo Bonzini bool cancelled; 1782f0c9fe6SPaolo Bonzini int ret; 1792f0c9fe6SPaolo Bonzini }; 1802f0c9fe6SPaolo Bonzini 181345f9e1bSMax Reitz static void block_job_finish_cb(void *opaque, int ret) 1822f0c9fe6SPaolo Bonzini { 183345f9e1bSMax Reitz struct BlockFinishData *data = opaque; 1842f0c9fe6SPaolo Bonzini 1852f0c9fe6SPaolo Bonzini data->cancelled = block_job_is_cancelled(data->job); 1862f0c9fe6SPaolo Bonzini data->ret = ret; 1872f0c9fe6SPaolo Bonzini data->cb(data->opaque, ret); 1882f0c9fe6SPaolo Bonzini } 1892f0c9fe6SPaolo Bonzini 190345f9e1bSMax Reitz static int block_job_finish_sync(BlockJob *job, 191345f9e1bSMax Reitz void (*finish)(BlockJob *, Error **errp), 192345f9e1bSMax Reitz Error **errp) 1932f0c9fe6SPaolo Bonzini { 194345f9e1bSMax Reitz struct BlockFinishData data; 1952f0c9fe6SPaolo Bonzini BlockDriverState *bs = job->bs; 196345f9e1bSMax Reitz Error *local_err = NULL; 1972f0c9fe6SPaolo Bonzini 1982f0c9fe6SPaolo Bonzini assert(bs->job == job); 1992f0c9fe6SPaolo Bonzini 2002f0c9fe6SPaolo Bonzini /* Set up our own callback to store the result and chain to 2012f0c9fe6SPaolo Bonzini * the original callback. 2022f0c9fe6SPaolo Bonzini */ 2032f0c9fe6SPaolo Bonzini data.job = job; 2042f0c9fe6SPaolo Bonzini data.cb = job->cb; 2052f0c9fe6SPaolo Bonzini data.opaque = job->opaque; 2062f0c9fe6SPaolo Bonzini data.ret = -EINPROGRESS; 207345f9e1bSMax Reitz job->cb = block_job_finish_cb; 2082f0c9fe6SPaolo Bonzini job->opaque = &data; 209345f9e1bSMax Reitz finish(job, &local_err); 210345f9e1bSMax Reitz if (local_err) { 211345f9e1bSMax Reitz error_propagate(errp, local_err); 212345f9e1bSMax Reitz return -EBUSY; 213345f9e1bSMax Reitz } 2142f0c9fe6SPaolo Bonzini while (data.ret == -EINPROGRESS) { 215b47ec2c4SPaolo Bonzini aio_poll(bdrv_get_aio_context(bs), true); 2162f0c9fe6SPaolo Bonzini } 2172f0c9fe6SPaolo Bonzini return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret; 2182f0c9fe6SPaolo Bonzini } 2192f0c9fe6SPaolo Bonzini 220345f9e1bSMax Reitz /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be 221345f9e1bSMax Reitz * used with block_job_finish_sync() without the need for (rather nasty) 222345f9e1bSMax Reitz * function pointer casts there. */ 223345f9e1bSMax Reitz static void block_job_cancel_err(BlockJob *job, Error **errp) 224345f9e1bSMax Reitz { 225345f9e1bSMax Reitz block_job_cancel(job); 226345f9e1bSMax Reitz } 227345f9e1bSMax Reitz 228345f9e1bSMax Reitz int block_job_cancel_sync(BlockJob *job) 229345f9e1bSMax Reitz { 230345f9e1bSMax Reitz return block_job_finish_sync(job, &block_job_cancel_err, NULL); 231345f9e1bSMax Reitz } 232345f9e1bSMax Reitz 233345f9e1bSMax Reitz int block_job_complete_sync(BlockJob *job, Error **errp) 234345f9e1bSMax Reitz { 235345f9e1bSMax Reitz return block_job_finish_sync(job, &block_job_complete, errp); 236345f9e1bSMax Reitz } 237345f9e1bSMax Reitz 2387483d1e5SAlex Bligh void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns) 2392f0c9fe6SPaolo Bonzini { 2408acc72a4SPaolo Bonzini assert(job->busy); 2418acc72a4SPaolo Bonzini 2422f0c9fe6SPaolo Bonzini /* Check cancellation *before* setting busy = false, too! */ 2438acc72a4SPaolo Bonzini if (block_job_is_cancelled(job)) { 2448acc72a4SPaolo Bonzini return; 2452f0c9fe6SPaolo Bonzini } 2468acc72a4SPaolo Bonzini 2478acc72a4SPaolo Bonzini job->busy = false; 2488acc72a4SPaolo Bonzini if (block_job_is_paused(job)) { 2498acc72a4SPaolo Bonzini qemu_coroutine_yield(); 2508acc72a4SPaolo Bonzini } else { 2510b9caf9bSFam Zheng co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns); 2528acc72a4SPaolo Bonzini } 2538acc72a4SPaolo Bonzini job->busy = true; 2542f0c9fe6SPaolo Bonzini } 25530e628b7SPaolo Bonzini 256dc71ce45SFam Zheng void block_job_yield(BlockJob *job) 257dc71ce45SFam Zheng { 258dc71ce45SFam Zheng assert(job->busy); 259dc71ce45SFam Zheng 260dc71ce45SFam Zheng /* Check cancellation *before* setting busy = false, too! */ 261dc71ce45SFam Zheng if (block_job_is_cancelled(job)) { 262dc71ce45SFam Zheng return; 263dc71ce45SFam Zheng } 264dc71ce45SFam Zheng 265dc71ce45SFam Zheng job->busy = false; 266dc71ce45SFam Zheng qemu_coroutine_yield(); 267dc71ce45SFam Zheng job->busy = true; 268dc71ce45SFam Zheng } 269dc71ce45SFam Zheng 27030e628b7SPaolo Bonzini BlockJobInfo *block_job_query(BlockJob *job) 27130e628b7SPaolo Bonzini { 27230e628b7SPaolo Bonzini BlockJobInfo *info = g_new0(BlockJobInfo, 1); 27379e14bf7SFam Zheng info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]); 2748ccb9569SKevin Wolf info->device = g_strdup(job->id); 27530e628b7SPaolo Bonzini info->len = job->len; 2768d65883fSPaolo Bonzini info->busy = job->busy; 277751ebd76SFam Zheng info->paused = job->pause_count > 0; 27830e628b7SPaolo Bonzini info->offset = job->offset; 27930e628b7SPaolo Bonzini info->speed = job->speed; 28032c81a4aSPaolo Bonzini info->io_status = job->iostatus; 281ef6dbf1eSMax Reitz info->ready = job->ready; 28230e628b7SPaolo Bonzini return info; 28330e628b7SPaolo Bonzini } 28432c81a4aSPaolo Bonzini 28532c81a4aSPaolo Bonzini static void block_job_iostatus_set_err(BlockJob *job, int error) 28632c81a4aSPaolo Bonzini { 28732c81a4aSPaolo Bonzini if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { 28832c81a4aSPaolo Bonzini job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : 28932c81a4aSPaolo Bonzini BLOCK_DEVICE_IO_STATUS_FAILED; 29032c81a4aSPaolo Bonzini } 29132c81a4aSPaolo Bonzini } 29232c81a4aSPaolo Bonzini 293bcada37bSWenchao Xia void block_job_event_cancelled(BlockJob *job) 294a66a2a36SPaolo Bonzini { 295bcada37bSWenchao Xia qapi_event_send_block_job_cancelled(job->driver->job_type, 2968ccb9569SKevin Wolf job->id, 297a66a2a36SPaolo Bonzini job->len, 298a66a2a36SPaolo Bonzini job->offset, 299bcada37bSWenchao Xia job->speed, 300bcada37bSWenchao Xia &error_abort); 301a66a2a36SPaolo Bonzini } 302a66a2a36SPaolo Bonzini 303bcada37bSWenchao Xia void block_job_event_completed(BlockJob *job, const char *msg) 304a66a2a36SPaolo Bonzini { 305bcada37bSWenchao Xia qapi_event_send_block_job_completed(job->driver->job_type, 3068ccb9569SKevin Wolf job->id, 307bcada37bSWenchao Xia job->len, 308bcada37bSWenchao Xia job->offset, 309bcada37bSWenchao Xia job->speed, 310bcada37bSWenchao Xia !!msg, 311bcada37bSWenchao Xia msg, 312bcada37bSWenchao Xia &error_abort); 313bcada37bSWenchao Xia } 314bcada37bSWenchao Xia 315bcada37bSWenchao Xia void block_job_event_ready(BlockJob *job) 316bcada37bSWenchao Xia { 317ef6dbf1eSMax Reitz job->ready = true; 318ef6dbf1eSMax Reitz 319518848a2SMarkus Armbruster qapi_event_send_block_job_ready(job->driver->job_type, 3208ccb9569SKevin Wolf job->id, 321518848a2SMarkus Armbruster job->len, 322518848a2SMarkus Armbruster job->offset, 323518848a2SMarkus Armbruster job->speed, &error_abort); 324a66a2a36SPaolo Bonzini } 325a66a2a36SPaolo Bonzini 32632c81a4aSPaolo Bonzini BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs, 32732c81a4aSPaolo Bonzini BlockdevOnError on_err, 32832c81a4aSPaolo Bonzini int is_read, int error) 32932c81a4aSPaolo Bonzini { 33032c81a4aSPaolo Bonzini BlockErrorAction action; 33132c81a4aSPaolo Bonzini 33232c81a4aSPaolo Bonzini switch (on_err) { 33332c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_ENOSPC: 334a589569fSWenchao Xia action = (error == ENOSPC) ? 335a589569fSWenchao Xia BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; 33632c81a4aSPaolo Bonzini break; 33732c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_STOP: 338a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_STOP; 33932c81a4aSPaolo Bonzini break; 34032c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_REPORT: 341a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_REPORT; 34232c81a4aSPaolo Bonzini break; 34332c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_IGNORE: 344a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_IGNORE; 34532c81a4aSPaolo Bonzini break; 34632c81a4aSPaolo Bonzini default: 34732c81a4aSPaolo Bonzini abort(); 34832c81a4aSPaolo Bonzini } 3498ccb9569SKevin Wolf qapi_event_send_block_job_error(job->id, 3505a2d2cbdSWenchao Xia is_read ? IO_OPERATION_TYPE_READ : 3515a2d2cbdSWenchao Xia IO_OPERATION_TYPE_WRITE, 3525a2d2cbdSWenchao Xia action, &error_abort); 353a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_STOP) { 354751ebd76SFam Zheng /* make the pause user visible, which will be resumed from QMP. */ 355751ebd76SFam Zheng job->user_paused = true; 35632c81a4aSPaolo Bonzini block_job_pause(job); 35732c81a4aSPaolo Bonzini block_job_iostatus_set_err(job, error); 358*373340b2SMax Reitz if (bs->blk && bs != job->bs) { 359*373340b2SMax Reitz blk_iostatus_set_err(bs->blk, error); 36032c81a4aSPaolo Bonzini } 36132c81a4aSPaolo Bonzini } 36232c81a4aSPaolo Bonzini return action; 36332c81a4aSPaolo Bonzini } 364dec7d421SStefan Hajnoczi 365dec7d421SStefan Hajnoczi typedef struct { 366dec7d421SStefan Hajnoczi BlockJob *job; 367dec7d421SStefan Hajnoczi QEMUBH *bh; 368dec7d421SStefan Hajnoczi AioContext *aio_context; 369dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopFn *fn; 370dec7d421SStefan Hajnoczi void *opaque; 371dec7d421SStefan Hajnoczi } BlockJobDeferToMainLoopData; 372dec7d421SStefan Hajnoczi 373dec7d421SStefan Hajnoczi static void block_job_defer_to_main_loop_bh(void *opaque) 374dec7d421SStefan Hajnoczi { 375dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopData *data = opaque; 376dec7d421SStefan Hajnoczi AioContext *aio_context; 377dec7d421SStefan Hajnoczi 378dec7d421SStefan Hajnoczi qemu_bh_delete(data->bh); 379dec7d421SStefan Hajnoczi 380dec7d421SStefan Hajnoczi /* Prevent race with block_job_defer_to_main_loop() */ 381dec7d421SStefan Hajnoczi aio_context_acquire(data->aio_context); 382dec7d421SStefan Hajnoczi 383dec7d421SStefan Hajnoczi /* Fetch BDS AioContext again, in case it has changed */ 384dec7d421SStefan Hajnoczi aio_context = bdrv_get_aio_context(data->job->bs); 385dec7d421SStefan Hajnoczi aio_context_acquire(aio_context); 386dec7d421SStefan Hajnoczi 387dec7d421SStefan Hajnoczi data->fn(data->job, data->opaque); 388dec7d421SStefan Hajnoczi 389dec7d421SStefan Hajnoczi aio_context_release(aio_context); 390dec7d421SStefan Hajnoczi 391dec7d421SStefan Hajnoczi aio_context_release(data->aio_context); 392dec7d421SStefan Hajnoczi 393dec7d421SStefan Hajnoczi g_free(data); 394dec7d421SStefan Hajnoczi } 395dec7d421SStefan Hajnoczi 396dec7d421SStefan Hajnoczi void block_job_defer_to_main_loop(BlockJob *job, 397dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopFn *fn, 398dec7d421SStefan Hajnoczi void *opaque) 399dec7d421SStefan Hajnoczi { 400dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); 401dec7d421SStefan Hajnoczi data->job = job; 402dec7d421SStefan Hajnoczi data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data); 403dec7d421SStefan Hajnoczi data->aio_context = bdrv_get_aio_context(job->bs); 404dec7d421SStefan Hajnoczi data->fn = fn; 405dec7d421SStefan Hajnoczi data->opaque = opaque; 406dec7d421SStefan Hajnoczi 407dec7d421SStefan Hajnoczi qemu_bh_schedule(data->bh); 408dec7d421SStefan Hajnoczi } 409