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 26d38ea87aSPeter Maydell #include "qemu/osdep.h" 272f0c9fe6SPaolo Bonzini #include "qemu-common.h" 28737e150eSPaolo Bonzini #include "block/block.h" 29c87621eaSJohn Snow #include "block/blockjob_int.h" 30737e150eSPaolo Bonzini #include "block/block_int.h" 31373340b2SMax Reitz #include "sysemu/block-backend.h" 32cc7a8ea7SMarkus Armbruster #include "qapi/qmp/qerror.h" 337b1b5d19SPaolo Bonzini #include "qapi/qmp/qjson.h" 3410817bf0SDaniel P. Berrange #include "qemu/coroutine.h" 357f0317cfSAlberto Garcia #include "qemu/id.h" 362f0c9fe6SPaolo Bonzini #include "qmp-commands.h" 371de7afc9SPaolo Bonzini #include "qemu/timer.h" 385a2d2cbdSWenchao Xia #include "qapi-event.h" 392f0c9fe6SPaolo Bonzini 408254b6d9SJohn Snow static void block_job_event_cancelled(BlockJob *job); 418254b6d9SJohn Snow static void block_job_event_completed(BlockJob *job, const char *msg); 428254b6d9SJohn Snow 43c55a832fSFam Zheng /* Transactional group of block jobs */ 44c55a832fSFam Zheng struct BlockJobTxn { 45c55a832fSFam Zheng 46c55a832fSFam Zheng /* Is this txn being cancelled? */ 47c55a832fSFam Zheng bool aborting; 48c55a832fSFam Zheng 49c55a832fSFam Zheng /* List of jobs */ 50c55a832fSFam Zheng QLIST_HEAD(, BlockJob) jobs; 51c55a832fSFam Zheng 52c55a832fSFam Zheng /* Reference count */ 53c55a832fSFam Zheng int refcnt; 54c55a832fSFam Zheng }; 55c55a832fSFam Zheng 56a7112795SAlberto Garcia static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs); 57a7112795SAlberto Garcia 58*88691b37SPaolo Bonzini /* 59*88691b37SPaolo Bonzini * The block job API is composed of two categories of functions. 60*88691b37SPaolo Bonzini * 61*88691b37SPaolo Bonzini * The first includes functions used by the monitor. The monitor is 62*88691b37SPaolo Bonzini * peculiar in that it accesses the block job list with block_job_get, and 63*88691b37SPaolo Bonzini * therefore needs consistency across block_job_get and the actual operation 64*88691b37SPaolo Bonzini * (e.g. block_job_set_speed). The consistency is achieved with 65*88691b37SPaolo Bonzini * aio_context_acquire/release. These functions are declared in blockjob.h. 66*88691b37SPaolo Bonzini * 67*88691b37SPaolo Bonzini * The second includes functions used by the block job drivers and sometimes 68*88691b37SPaolo Bonzini * by the core block layer. These do not care about locking, because the 69*88691b37SPaolo Bonzini * whole coroutine runs under the AioContext lock, and are declared in 70*88691b37SPaolo Bonzini * blockjob_int.h. 71*88691b37SPaolo Bonzini */ 72*88691b37SPaolo Bonzini 73a7112795SAlberto Garcia BlockJob *block_job_next(BlockJob *job) 74a7112795SAlberto Garcia { 75a7112795SAlberto Garcia if (!job) { 76a7112795SAlberto Garcia return QLIST_FIRST(&block_jobs); 77a7112795SAlberto Garcia } 78a7112795SAlberto Garcia return QLIST_NEXT(job, job_list); 79a7112795SAlberto Garcia } 80a7112795SAlberto Garcia 81ffb1f10cSAlberto Garcia BlockJob *block_job_get(const char *id) 82ffb1f10cSAlberto Garcia { 83ffb1f10cSAlberto Garcia BlockJob *job; 84ffb1f10cSAlberto Garcia 85ffb1f10cSAlberto Garcia QLIST_FOREACH(job, &block_jobs, job_list) { 86559b935fSJohn Snow if (job->id && !strcmp(id, job->id)) { 87ffb1f10cSAlberto Garcia return job; 88ffb1f10cSAlberto Garcia } 89ffb1f10cSAlberto Garcia } 90ffb1f10cSAlberto Garcia 91ffb1f10cSAlberto Garcia return NULL; 92ffb1f10cSAlberto Garcia } 93ffb1f10cSAlberto Garcia 94f321dcb5SPaolo Bonzini static void block_job_pause(BlockJob *job) 95f321dcb5SPaolo Bonzini { 96f321dcb5SPaolo Bonzini job->pause_count++; 97f321dcb5SPaolo Bonzini } 98f321dcb5SPaolo Bonzini 99f321dcb5SPaolo Bonzini static void block_job_resume(BlockJob *job) 100f321dcb5SPaolo Bonzini { 101f321dcb5SPaolo Bonzini assert(job->pause_count > 0); 102f321dcb5SPaolo Bonzini job->pause_count--; 103f321dcb5SPaolo Bonzini if (job->pause_count) { 104f321dcb5SPaolo Bonzini return; 105f321dcb5SPaolo Bonzini } 106f321dcb5SPaolo Bonzini block_job_enter(job); 107f321dcb5SPaolo Bonzini } 108f321dcb5SPaolo Bonzini 10905b0d8e3SPaolo Bonzini static void block_job_ref(BlockJob *job) 11005b0d8e3SPaolo Bonzini { 11105b0d8e3SPaolo Bonzini ++job->refcnt; 11205b0d8e3SPaolo Bonzini } 11305b0d8e3SPaolo Bonzini 11405b0d8e3SPaolo Bonzini static void block_job_attached_aio_context(AioContext *new_context, 11505b0d8e3SPaolo Bonzini void *opaque); 11605b0d8e3SPaolo Bonzini static void block_job_detach_aio_context(void *opaque); 11705b0d8e3SPaolo Bonzini 11805b0d8e3SPaolo Bonzini static void block_job_unref(BlockJob *job) 11905b0d8e3SPaolo Bonzini { 12005b0d8e3SPaolo Bonzini if (--job->refcnt == 0) { 12105b0d8e3SPaolo Bonzini BlockDriverState *bs = blk_bs(job->blk); 12205b0d8e3SPaolo Bonzini bs->job = NULL; 12305b0d8e3SPaolo Bonzini block_job_remove_all_bdrv(job); 12405b0d8e3SPaolo Bonzini blk_remove_aio_context_notifier(job->blk, 12505b0d8e3SPaolo Bonzini block_job_attached_aio_context, 12605b0d8e3SPaolo Bonzini block_job_detach_aio_context, job); 12705b0d8e3SPaolo Bonzini blk_unref(job->blk); 12805b0d8e3SPaolo Bonzini error_free(job->blocker); 12905b0d8e3SPaolo Bonzini g_free(job->id); 13005b0d8e3SPaolo Bonzini QLIST_REMOVE(job, job_list); 13105b0d8e3SPaolo Bonzini g_free(job); 13205b0d8e3SPaolo Bonzini } 13305b0d8e3SPaolo Bonzini } 13405b0d8e3SPaolo Bonzini 135463e0be1SStefan Hajnoczi static void block_job_attached_aio_context(AioContext *new_context, 136463e0be1SStefan Hajnoczi void *opaque) 137463e0be1SStefan Hajnoczi { 138463e0be1SStefan Hajnoczi BlockJob *job = opaque; 139463e0be1SStefan Hajnoczi 140463e0be1SStefan Hajnoczi if (job->driver->attached_aio_context) { 141463e0be1SStefan Hajnoczi job->driver->attached_aio_context(job, new_context); 142463e0be1SStefan Hajnoczi } 143463e0be1SStefan Hajnoczi 144463e0be1SStefan Hajnoczi block_job_resume(job); 145463e0be1SStefan Hajnoczi } 146463e0be1SStefan Hajnoczi 147bae8196dSPaolo Bonzini static void block_job_drain(BlockJob *job) 148bae8196dSPaolo Bonzini { 149bae8196dSPaolo Bonzini /* If job is !job->busy this kicks it into the next pause point. */ 150bae8196dSPaolo Bonzini block_job_enter(job); 151bae8196dSPaolo Bonzini 152bae8196dSPaolo Bonzini blk_drain(job->blk); 153bae8196dSPaolo Bonzini if (job->driver->drain) { 154bae8196dSPaolo Bonzini job->driver->drain(job); 155bae8196dSPaolo Bonzini } 156bae8196dSPaolo Bonzini } 157bae8196dSPaolo Bonzini 158463e0be1SStefan Hajnoczi static void block_job_detach_aio_context(void *opaque) 159463e0be1SStefan Hajnoczi { 160463e0be1SStefan Hajnoczi BlockJob *job = opaque; 161463e0be1SStefan Hajnoczi 162463e0be1SStefan Hajnoczi /* In case the job terminates during aio_poll()... */ 163463e0be1SStefan Hajnoczi block_job_ref(job); 164463e0be1SStefan Hajnoczi 165463e0be1SStefan Hajnoczi block_job_pause(job); 166463e0be1SStefan Hajnoczi 167463e0be1SStefan Hajnoczi while (!job->paused && !job->completed) { 168bae8196dSPaolo Bonzini block_job_drain(job); 169463e0be1SStefan Hajnoczi } 170463e0be1SStefan Hajnoczi 171463e0be1SStefan Hajnoczi block_job_unref(job); 172463e0be1SStefan Hajnoczi } 173463e0be1SStefan Hajnoczi 174f321dcb5SPaolo Bonzini static char *child_job_get_parent_desc(BdrvChild *c) 175f321dcb5SPaolo Bonzini { 176f321dcb5SPaolo Bonzini BlockJob *job = c->opaque; 177f321dcb5SPaolo Bonzini return g_strdup_printf("%s job '%s'", 178f321dcb5SPaolo Bonzini BlockJobType_lookup[job->driver->job_type], 179f321dcb5SPaolo Bonzini job->id); 180f321dcb5SPaolo Bonzini } 181f321dcb5SPaolo Bonzini 182f321dcb5SPaolo Bonzini static const BdrvChildRole child_job = { 183f321dcb5SPaolo Bonzini .get_parent_desc = child_job_get_parent_desc, 184f321dcb5SPaolo Bonzini .stay_at_node = true, 185f321dcb5SPaolo Bonzini }; 186f321dcb5SPaolo Bonzini 187f321dcb5SPaolo Bonzini static void block_job_drained_begin(void *opaque) 188f321dcb5SPaolo Bonzini { 189f321dcb5SPaolo Bonzini BlockJob *job = opaque; 190f321dcb5SPaolo Bonzini block_job_pause(job); 191f321dcb5SPaolo Bonzini } 192f321dcb5SPaolo Bonzini 193f321dcb5SPaolo Bonzini static void block_job_drained_end(void *opaque) 194f321dcb5SPaolo Bonzini { 195f321dcb5SPaolo Bonzini BlockJob *job = opaque; 196f321dcb5SPaolo Bonzini block_job_resume(job); 197f321dcb5SPaolo Bonzini } 198f321dcb5SPaolo Bonzini 199f321dcb5SPaolo Bonzini static const BlockDevOps block_job_dev_ops = { 200f321dcb5SPaolo Bonzini .drained_begin = block_job_drained_begin, 201f321dcb5SPaolo Bonzini .drained_end = block_job_drained_end, 202f321dcb5SPaolo Bonzini }; 203f321dcb5SPaolo Bonzini 204bbc02b90SKevin Wolf void block_job_remove_all_bdrv(BlockJob *job) 205bbc02b90SKevin Wolf { 206bbc02b90SKevin Wolf GSList *l; 207bbc02b90SKevin Wolf for (l = job->nodes; l; l = l->next) { 208bbc02b90SKevin Wolf BdrvChild *c = l->data; 209bbc02b90SKevin Wolf bdrv_op_unblock_all(c->bs, job->blocker); 210bbc02b90SKevin Wolf bdrv_root_unref_child(c); 211bbc02b90SKevin Wolf } 212bbc02b90SKevin Wolf g_slist_free(job->nodes); 213bbc02b90SKevin Wolf job->nodes = NULL; 214bbc02b90SKevin Wolf } 215bbc02b90SKevin Wolf 21676d554e2SKevin Wolf int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs, 21776d554e2SKevin Wolf uint64_t perm, uint64_t shared_perm, Error **errp) 21823d402d4SAlberto Garcia { 21976d554e2SKevin Wolf BdrvChild *c; 22076d554e2SKevin Wolf 22176d554e2SKevin Wolf c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm, 22276d554e2SKevin Wolf job, errp); 22376d554e2SKevin Wolf if (c == NULL) { 22476d554e2SKevin Wolf return -EPERM; 22576d554e2SKevin Wolf } 22676d554e2SKevin Wolf 22776d554e2SKevin Wolf job->nodes = g_slist_prepend(job->nodes, c); 22823d402d4SAlberto Garcia bdrv_ref(bs); 22923d402d4SAlberto Garcia bdrv_op_block_all(bs, job->blocker); 23076d554e2SKevin Wolf 23176d554e2SKevin Wolf return 0; 23223d402d4SAlberto Garcia } 23323d402d4SAlberto Garcia 234559b935fSJohn Snow bool block_job_is_internal(BlockJob *job) 235559b935fSJohn Snow { 236559b935fSJohn Snow return (job->id == NULL); 237559b935fSJohn Snow } 238559b935fSJohn Snow 2395ccac6f1SJohn Snow static bool block_job_started(BlockJob *job) 2405ccac6f1SJohn Snow { 2415ccac6f1SJohn Snow return job->co; 2425ccac6f1SJohn Snow } 2435ccac6f1SJohn Snow 244e3796a24SJohn Snow /** 245e3796a24SJohn Snow * All jobs must allow a pause point before entering their job proper. This 246e3796a24SJohn Snow * ensures that jobs can be paused prior to being started, then resumed later. 247e3796a24SJohn Snow */ 248e3796a24SJohn Snow static void coroutine_fn block_job_co_entry(void *opaque) 249e3796a24SJohn Snow { 250e3796a24SJohn Snow BlockJob *job = opaque; 251e3796a24SJohn Snow 252e3796a24SJohn Snow assert(job && job->driver && job->driver->start); 253e3796a24SJohn Snow block_job_pause_point(job); 254e3796a24SJohn Snow job->driver->start(job); 255e3796a24SJohn Snow } 256e3796a24SJohn Snow 2575ccac6f1SJohn Snow void block_job_start(BlockJob *job) 2585ccac6f1SJohn Snow { 2595ccac6f1SJohn Snow assert(job && !block_job_started(job) && job->paused && 260e3796a24SJohn Snow job->driver && job->driver->start); 261e3796a24SJohn Snow job->co = qemu_coroutine_create(block_job_co_entry, job); 262e3796a24SJohn Snow job->pause_count--; 2635ccac6f1SJohn Snow job->busy = true; 264e3796a24SJohn Snow job->paused = false; 265aef4278cSFam Zheng bdrv_coroutine_enter(blk_bs(job->blk), job->co); 2665ccac6f1SJohn Snow } 2675ccac6f1SJohn Snow 268c55a832fSFam Zheng static void block_job_completed_single(BlockJob *job) 269c55a832fSFam Zheng { 270c55a832fSFam Zheng if (!job->ret) { 271c55a832fSFam Zheng if (job->driver->commit) { 272c55a832fSFam Zheng job->driver->commit(job); 273c55a832fSFam Zheng } 274c55a832fSFam Zheng } else { 275c55a832fSFam Zheng if (job->driver->abort) { 276c55a832fSFam Zheng job->driver->abort(job); 277c55a832fSFam Zheng } 278c55a832fSFam Zheng } 279e8a40bf7SJohn Snow if (job->driver->clean) { 280e8a40bf7SJohn Snow job->driver->clean(job); 281e8a40bf7SJohn Snow } 2828254b6d9SJohn Snow 2838254b6d9SJohn Snow if (job->cb) { 284c55a832fSFam Zheng job->cb(job->opaque, job->ret); 2858254b6d9SJohn Snow } 2865ccac6f1SJohn Snow 2875ccac6f1SJohn Snow /* Emit events only if we actually started */ 2885ccac6f1SJohn Snow if (block_job_started(job)) { 2898254b6d9SJohn Snow if (block_job_is_cancelled(job)) { 2908254b6d9SJohn Snow block_job_event_cancelled(job); 2918254b6d9SJohn Snow } else { 2928254b6d9SJohn Snow const char *msg = NULL; 2938254b6d9SJohn Snow if (job->ret < 0) { 2948254b6d9SJohn Snow msg = strerror(-job->ret); 2958254b6d9SJohn Snow } 2968254b6d9SJohn Snow block_job_event_completed(job, msg); 2978254b6d9SJohn Snow } 2985ccac6f1SJohn Snow } 2998254b6d9SJohn Snow 300c55a832fSFam Zheng if (job->txn) { 3011e93b9fbSVladimir Sementsov-Ogievskiy QLIST_REMOVE(job, txn_list); 302c55a832fSFam Zheng block_job_txn_unref(job->txn); 303c55a832fSFam Zheng } 304c55a832fSFam Zheng block_job_unref(job); 305c55a832fSFam Zheng } 306c55a832fSFam Zheng 307c55a832fSFam Zheng static void block_job_completed_txn_abort(BlockJob *job) 308c55a832fSFam Zheng { 309c55a832fSFam Zheng AioContext *ctx; 310c55a832fSFam Zheng BlockJobTxn *txn = job->txn; 311c55a832fSFam Zheng BlockJob *other_job, *next; 312c55a832fSFam Zheng 313c55a832fSFam Zheng if (txn->aborting) { 314c55a832fSFam Zheng /* 315c55a832fSFam Zheng * We are cancelled by another job, which will handle everything. 316c55a832fSFam Zheng */ 317c55a832fSFam Zheng return; 318c55a832fSFam Zheng } 319c55a832fSFam Zheng txn->aborting = true; 320c55a832fSFam Zheng /* We are the first failed job. Cancel other jobs. */ 321c55a832fSFam Zheng QLIST_FOREACH(other_job, &txn->jobs, txn_list) { 322b6d2e599SKevin Wolf ctx = blk_get_aio_context(other_job->blk); 323c55a832fSFam Zheng aio_context_acquire(ctx); 324c55a832fSFam Zheng } 325c55a832fSFam Zheng QLIST_FOREACH(other_job, &txn->jobs, txn_list) { 326c55a832fSFam Zheng if (other_job == job || other_job->completed) { 327c55a832fSFam Zheng /* Other jobs are "effectively" cancelled by us, set the status for 328c55a832fSFam Zheng * them; this job, however, may or may not be cancelled, depending 329c55a832fSFam Zheng * on the caller, so leave it. */ 330c55a832fSFam Zheng if (other_job != job) { 331c55a832fSFam Zheng other_job->cancelled = true; 332c55a832fSFam Zheng } 333c55a832fSFam Zheng continue; 334c55a832fSFam Zheng } 335c55a832fSFam Zheng block_job_cancel_sync(other_job); 336c55a832fSFam Zheng assert(other_job->completed); 337c55a832fSFam Zheng } 338c55a832fSFam Zheng QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { 339b6d2e599SKevin Wolf ctx = blk_get_aio_context(other_job->blk); 340c55a832fSFam Zheng block_job_completed_single(other_job); 341c55a832fSFam Zheng aio_context_release(ctx); 342c55a832fSFam Zheng } 343c55a832fSFam Zheng } 344c55a832fSFam Zheng 345c55a832fSFam Zheng static void block_job_completed_txn_success(BlockJob *job) 346c55a832fSFam Zheng { 347c55a832fSFam Zheng AioContext *ctx; 348c55a832fSFam Zheng BlockJobTxn *txn = job->txn; 349c55a832fSFam Zheng BlockJob *other_job, *next; 350c55a832fSFam Zheng /* 351c55a832fSFam Zheng * Successful completion, see if there are other running jobs in this 352c55a832fSFam Zheng * txn. 353c55a832fSFam Zheng */ 354c55a832fSFam Zheng QLIST_FOREACH(other_job, &txn->jobs, txn_list) { 355c55a832fSFam Zheng if (!other_job->completed) { 356c55a832fSFam Zheng return; 357c55a832fSFam Zheng } 358c55a832fSFam Zheng } 359c55a832fSFam Zheng /* We are the last completed job, commit the transaction. */ 360c55a832fSFam Zheng QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { 361b6d2e599SKevin Wolf ctx = blk_get_aio_context(other_job->blk); 362c55a832fSFam Zheng aio_context_acquire(ctx); 363c55a832fSFam Zheng assert(other_job->ret == 0); 364c55a832fSFam Zheng block_job_completed_single(other_job); 365c55a832fSFam Zheng aio_context_release(ctx); 366c55a832fSFam Zheng } 367c55a832fSFam Zheng } 368c55a832fSFam Zheng 3692f0c9fe6SPaolo Bonzini void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) 3702f0c9fe6SPaolo Bonzini { 3712f0c9fe6SPaolo Bonzini Error *local_err = NULL; 3722f0c9fe6SPaolo Bonzini 3733fc4b10aSFam Zheng if (!job->driver->set_speed) { 374c6bd8c70SMarkus Armbruster error_setg(errp, QERR_UNSUPPORTED); 3752f0c9fe6SPaolo Bonzini return; 3762f0c9fe6SPaolo Bonzini } 3773fc4b10aSFam Zheng job->driver->set_speed(job, speed, &local_err); 37884d18f06SMarkus Armbruster if (local_err) { 3792f0c9fe6SPaolo Bonzini error_propagate(errp, local_err); 3802f0c9fe6SPaolo Bonzini return; 3812f0c9fe6SPaolo Bonzini } 3822f0c9fe6SPaolo Bonzini 3832f0c9fe6SPaolo Bonzini job->speed = speed; 3842f0c9fe6SPaolo Bonzini } 3852f0c9fe6SPaolo Bonzini 386aeae883bSPaolo Bonzini void block_job_complete(BlockJob *job, Error **errp) 387aeae883bSPaolo Bonzini { 388559b935fSJohn Snow /* Should not be reachable via external interface for internal jobs */ 389559b935fSJohn Snow assert(job->id); 3905ccac6f1SJohn Snow if (job->pause_count || job->cancelled || 3915ccac6f1SJohn Snow !block_job_started(job) || !job->driver->complete) { 3929df229c3SAlberto Garcia error_setg(errp, "The active block job '%s' cannot be completed", 3939df229c3SAlberto Garcia job->id); 394aeae883bSPaolo Bonzini return; 395aeae883bSPaolo Bonzini } 396aeae883bSPaolo Bonzini 3973fc4b10aSFam Zheng job->driver->complete(job, errp); 398aeae883bSPaolo Bonzini } 399aeae883bSPaolo Bonzini 4000df4ba58SJohn Snow void block_job_user_pause(BlockJob *job) 4010df4ba58SJohn Snow { 4020df4ba58SJohn Snow job->user_paused = true; 4030df4ba58SJohn Snow block_job_pause(job); 4040df4ba58SJohn Snow } 4050df4ba58SJohn Snow 4060df4ba58SJohn Snow bool block_job_user_paused(BlockJob *job) 4070df4ba58SJohn Snow { 4086573d9c6SPaolo Bonzini return job->user_paused; 4090df4ba58SJohn Snow } 4100df4ba58SJohn Snow 4110df4ba58SJohn Snow void block_job_user_resume(BlockJob *job) 4120df4ba58SJohn Snow { 4130df4ba58SJohn Snow if (job && job->user_paused && job->pause_count > 0) { 4140df4ba58SJohn Snow job->user_paused = false; 4150df4ba58SJohn Snow block_job_resume(job); 4160df4ba58SJohn Snow } 4170df4ba58SJohn Snow } 4180df4ba58SJohn Snow 4198acc72a4SPaolo Bonzini void block_job_cancel(BlockJob *job) 4208acc72a4SPaolo Bonzini { 4215ccac6f1SJohn Snow if (block_job_started(job)) { 4228acc72a4SPaolo Bonzini job->cancelled = true; 42317bd51f9SStefan Hajnoczi block_job_iostatus_reset(job); 424751ebd76SFam Zheng block_job_enter(job); 4255ccac6f1SJohn Snow } else { 4265ccac6f1SJohn Snow block_job_completed(job, -ECANCELED); 4275ccac6f1SJohn Snow } 4288acc72a4SPaolo Bonzini } 4298acc72a4SPaolo Bonzini 43032c81a4aSPaolo Bonzini void block_job_iostatus_reset(BlockJob *job) 43132c81a4aSPaolo Bonzini { 43232c81a4aSPaolo Bonzini job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; 43332c81a4aSPaolo Bonzini } 43432c81a4aSPaolo Bonzini 435345f9e1bSMax Reitz static int block_job_finish_sync(BlockJob *job, 436345f9e1bSMax Reitz void (*finish)(BlockJob *, Error **errp), 437345f9e1bSMax Reitz Error **errp) 4382f0c9fe6SPaolo Bonzini { 439345f9e1bSMax Reitz Error *local_err = NULL; 44094db6d2dSFam Zheng int ret; 4412f0c9fe6SPaolo Bonzini 442b6d2e599SKevin Wolf assert(blk_bs(job->blk)->job == job); 4432f0c9fe6SPaolo Bonzini 44494db6d2dSFam Zheng block_job_ref(job); 445bae8196dSPaolo Bonzini 446345f9e1bSMax Reitz finish(job, &local_err); 447345f9e1bSMax Reitz if (local_err) { 448345f9e1bSMax Reitz error_propagate(errp, local_err); 44994db6d2dSFam Zheng block_job_unref(job); 450345f9e1bSMax Reitz return -EBUSY; 451345f9e1bSMax Reitz } 452bae8196dSPaolo Bonzini /* block_job_drain calls block_job_enter, and it should be enough to 453bae8196dSPaolo Bonzini * induce progress until the job completes or moves to the main thread. 454bae8196dSPaolo Bonzini */ 455bae8196dSPaolo Bonzini while (!job->deferred_to_main_loop && !job->completed) { 456bae8196dSPaolo Bonzini block_job_drain(job); 457bae8196dSPaolo Bonzini } 45894db6d2dSFam Zheng while (!job->completed) { 459bae8196dSPaolo Bonzini aio_poll(qemu_get_aio_context(), true); 4602f0c9fe6SPaolo Bonzini } 46194db6d2dSFam Zheng ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret; 46294db6d2dSFam Zheng block_job_unref(job); 46394db6d2dSFam Zheng return ret; 4642f0c9fe6SPaolo Bonzini } 4652f0c9fe6SPaolo Bonzini 466345f9e1bSMax Reitz /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be 467345f9e1bSMax Reitz * used with block_job_finish_sync() without the need for (rather nasty) 468345f9e1bSMax Reitz * function pointer casts there. */ 469345f9e1bSMax Reitz static void block_job_cancel_err(BlockJob *job, Error **errp) 470345f9e1bSMax Reitz { 471345f9e1bSMax Reitz block_job_cancel(job); 472345f9e1bSMax Reitz } 473345f9e1bSMax Reitz 474345f9e1bSMax Reitz int block_job_cancel_sync(BlockJob *job) 475345f9e1bSMax Reitz { 476345f9e1bSMax Reitz return block_job_finish_sync(job, &block_job_cancel_err, NULL); 477345f9e1bSMax Reitz } 478345f9e1bSMax Reitz 479a1a2af07SKevin Wolf void block_job_cancel_sync_all(void) 480a1a2af07SKevin Wolf { 481a1a2af07SKevin Wolf BlockJob *job; 482a1a2af07SKevin Wolf AioContext *aio_context; 483a1a2af07SKevin Wolf 484a1a2af07SKevin Wolf while ((job = QLIST_FIRST(&block_jobs))) { 485b6d2e599SKevin Wolf aio_context = blk_get_aio_context(job->blk); 486a1a2af07SKevin Wolf aio_context_acquire(aio_context); 487a1a2af07SKevin Wolf block_job_cancel_sync(job); 488a1a2af07SKevin Wolf aio_context_release(aio_context); 489a1a2af07SKevin Wolf } 490a1a2af07SKevin Wolf } 491a1a2af07SKevin Wolf 492345f9e1bSMax Reitz int block_job_complete_sync(BlockJob *job, Error **errp) 493345f9e1bSMax Reitz { 494345f9e1bSMax Reitz return block_job_finish_sync(job, &block_job_complete, errp); 495345f9e1bSMax Reitz } 496345f9e1bSMax Reitz 497559b935fSJohn Snow BlockJobInfo *block_job_query(BlockJob *job, Error **errp) 49830e628b7SPaolo Bonzini { 499559b935fSJohn Snow BlockJobInfo *info; 500559b935fSJohn Snow 501559b935fSJohn Snow if (block_job_is_internal(job)) { 502559b935fSJohn Snow error_setg(errp, "Cannot query QEMU internal jobs"); 503559b935fSJohn Snow return NULL; 504559b935fSJohn Snow } 505559b935fSJohn Snow info = g_new0(BlockJobInfo, 1); 50679e14bf7SFam Zheng info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]); 5078ccb9569SKevin Wolf info->device = g_strdup(job->id); 50830e628b7SPaolo Bonzini info->len = job->len; 5098d65883fSPaolo Bonzini info->busy = job->busy; 510751ebd76SFam Zheng info->paused = job->pause_count > 0; 51130e628b7SPaolo Bonzini info->offset = job->offset; 51230e628b7SPaolo Bonzini info->speed = job->speed; 51332c81a4aSPaolo Bonzini info->io_status = job->iostatus; 514ef6dbf1eSMax Reitz info->ready = job->ready; 51530e628b7SPaolo Bonzini return info; 51630e628b7SPaolo Bonzini } 51732c81a4aSPaolo Bonzini 51832c81a4aSPaolo Bonzini static void block_job_iostatus_set_err(BlockJob *job, int error) 51932c81a4aSPaolo Bonzini { 52032c81a4aSPaolo Bonzini if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { 52132c81a4aSPaolo Bonzini job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : 52232c81a4aSPaolo Bonzini BLOCK_DEVICE_IO_STATUS_FAILED; 52332c81a4aSPaolo Bonzini } 52432c81a4aSPaolo Bonzini } 52532c81a4aSPaolo Bonzini 5268254b6d9SJohn Snow static void block_job_event_cancelled(BlockJob *job) 527a66a2a36SPaolo Bonzini { 528559b935fSJohn Snow if (block_job_is_internal(job)) { 529559b935fSJohn Snow return; 530559b935fSJohn Snow } 531559b935fSJohn Snow 532bcada37bSWenchao Xia qapi_event_send_block_job_cancelled(job->driver->job_type, 5338ccb9569SKevin Wolf job->id, 534a66a2a36SPaolo Bonzini job->len, 535a66a2a36SPaolo Bonzini job->offset, 536bcada37bSWenchao Xia job->speed, 537bcada37bSWenchao Xia &error_abort); 538a66a2a36SPaolo Bonzini } 539a66a2a36SPaolo Bonzini 5408254b6d9SJohn Snow static void block_job_event_completed(BlockJob *job, const char *msg) 541a66a2a36SPaolo Bonzini { 542559b935fSJohn Snow if (block_job_is_internal(job)) { 543559b935fSJohn Snow return; 544559b935fSJohn Snow } 545559b935fSJohn Snow 546bcada37bSWenchao Xia qapi_event_send_block_job_completed(job->driver->job_type, 5478ccb9569SKevin Wolf job->id, 548bcada37bSWenchao Xia job->len, 549bcada37bSWenchao Xia job->offset, 550bcada37bSWenchao Xia job->speed, 551bcada37bSWenchao Xia !!msg, 552bcada37bSWenchao Xia msg, 553bcada37bSWenchao Xia &error_abort); 554bcada37bSWenchao Xia } 555bcada37bSWenchao Xia 556*88691b37SPaolo Bonzini /* 557*88691b37SPaolo Bonzini * API for block job drivers and the block layer. These functions are 558*88691b37SPaolo Bonzini * declared in blockjob_int.h. 559*88691b37SPaolo Bonzini */ 560*88691b37SPaolo Bonzini 561*88691b37SPaolo Bonzini void *block_job_create(const char *job_id, const BlockJobDriver *driver, 562*88691b37SPaolo Bonzini BlockDriverState *bs, uint64_t perm, 563*88691b37SPaolo Bonzini uint64_t shared_perm, int64_t speed, int flags, 564*88691b37SPaolo Bonzini BlockCompletionFunc *cb, void *opaque, Error **errp) 565*88691b37SPaolo Bonzini { 566*88691b37SPaolo Bonzini BlockBackend *blk; 567*88691b37SPaolo Bonzini BlockJob *job; 568*88691b37SPaolo Bonzini int ret; 569*88691b37SPaolo Bonzini 570*88691b37SPaolo Bonzini if (bs->job) { 571*88691b37SPaolo Bonzini error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 572*88691b37SPaolo Bonzini return NULL; 573*88691b37SPaolo Bonzini } 574*88691b37SPaolo Bonzini 575*88691b37SPaolo Bonzini if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) { 576*88691b37SPaolo Bonzini job_id = bdrv_get_device_name(bs); 577*88691b37SPaolo Bonzini if (!*job_id) { 578*88691b37SPaolo Bonzini error_setg(errp, "An explicit job ID is required for this node"); 579*88691b37SPaolo Bonzini return NULL; 580*88691b37SPaolo Bonzini } 581*88691b37SPaolo Bonzini } 582*88691b37SPaolo Bonzini 583*88691b37SPaolo Bonzini if (job_id) { 584*88691b37SPaolo Bonzini if (flags & BLOCK_JOB_INTERNAL) { 585*88691b37SPaolo Bonzini error_setg(errp, "Cannot specify job ID for internal block job"); 586*88691b37SPaolo Bonzini return NULL; 587*88691b37SPaolo Bonzini } 588*88691b37SPaolo Bonzini 589*88691b37SPaolo Bonzini if (!id_wellformed(job_id)) { 590*88691b37SPaolo Bonzini error_setg(errp, "Invalid job ID '%s'", job_id); 591*88691b37SPaolo Bonzini return NULL; 592*88691b37SPaolo Bonzini } 593*88691b37SPaolo Bonzini 594*88691b37SPaolo Bonzini if (block_job_get(job_id)) { 595*88691b37SPaolo Bonzini error_setg(errp, "Job ID '%s' already in use", job_id); 596*88691b37SPaolo Bonzini return NULL; 597*88691b37SPaolo Bonzini } 598*88691b37SPaolo Bonzini } 599*88691b37SPaolo Bonzini 600*88691b37SPaolo Bonzini blk = blk_new(perm, shared_perm); 601*88691b37SPaolo Bonzini ret = blk_insert_bs(blk, bs, errp); 602*88691b37SPaolo Bonzini if (ret < 0) { 603*88691b37SPaolo Bonzini blk_unref(blk); 604*88691b37SPaolo Bonzini return NULL; 605*88691b37SPaolo Bonzini } 606*88691b37SPaolo Bonzini 607*88691b37SPaolo Bonzini job = g_malloc0(driver->instance_size); 608*88691b37SPaolo Bonzini job->driver = driver; 609*88691b37SPaolo Bonzini job->id = g_strdup(job_id); 610*88691b37SPaolo Bonzini job->blk = blk; 611*88691b37SPaolo Bonzini job->cb = cb; 612*88691b37SPaolo Bonzini job->opaque = opaque; 613*88691b37SPaolo Bonzini job->busy = false; 614*88691b37SPaolo Bonzini job->paused = true; 615*88691b37SPaolo Bonzini job->pause_count = 1; 616*88691b37SPaolo Bonzini job->refcnt = 1; 617*88691b37SPaolo Bonzini 618*88691b37SPaolo Bonzini error_setg(&job->blocker, "block device is in use by block job: %s", 619*88691b37SPaolo Bonzini BlockJobType_lookup[driver->job_type]); 620*88691b37SPaolo Bonzini block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort); 621*88691b37SPaolo Bonzini bs->job = job; 622*88691b37SPaolo Bonzini 623*88691b37SPaolo Bonzini blk_set_dev_ops(blk, &block_job_dev_ops, job); 624*88691b37SPaolo Bonzini bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); 625*88691b37SPaolo Bonzini 626*88691b37SPaolo Bonzini QLIST_INSERT_HEAD(&block_jobs, job, job_list); 627*88691b37SPaolo Bonzini 628*88691b37SPaolo Bonzini blk_add_aio_context_notifier(blk, block_job_attached_aio_context, 629*88691b37SPaolo Bonzini block_job_detach_aio_context, job); 630*88691b37SPaolo Bonzini 631*88691b37SPaolo Bonzini /* Only set speed when necessary to avoid NotSupported error */ 632*88691b37SPaolo Bonzini if (speed != 0) { 633*88691b37SPaolo Bonzini Error *local_err = NULL; 634*88691b37SPaolo Bonzini 635*88691b37SPaolo Bonzini block_job_set_speed(job, speed, &local_err); 636*88691b37SPaolo Bonzini if (local_err) { 637*88691b37SPaolo Bonzini block_job_unref(job); 638*88691b37SPaolo Bonzini error_propagate(errp, local_err); 639*88691b37SPaolo Bonzini return NULL; 640*88691b37SPaolo Bonzini } 641*88691b37SPaolo Bonzini } 642*88691b37SPaolo Bonzini return job; 643*88691b37SPaolo Bonzini } 644*88691b37SPaolo Bonzini 645f321dcb5SPaolo Bonzini void block_job_pause_all(void) 646f321dcb5SPaolo Bonzini { 647f321dcb5SPaolo Bonzini BlockJob *job = NULL; 648f321dcb5SPaolo Bonzini while ((job = block_job_next(job))) { 649f321dcb5SPaolo Bonzini AioContext *aio_context = blk_get_aio_context(job->blk); 650f321dcb5SPaolo Bonzini 651f321dcb5SPaolo Bonzini aio_context_acquire(aio_context); 652f321dcb5SPaolo Bonzini block_job_pause(job); 653f321dcb5SPaolo Bonzini aio_context_release(aio_context); 654f321dcb5SPaolo Bonzini } 655f321dcb5SPaolo Bonzini } 656f321dcb5SPaolo Bonzini 657*88691b37SPaolo Bonzini void block_job_early_fail(BlockJob *job) 658*88691b37SPaolo Bonzini { 659*88691b37SPaolo Bonzini block_job_unref(job); 660*88691b37SPaolo Bonzini } 661*88691b37SPaolo Bonzini 662*88691b37SPaolo Bonzini void block_job_completed(BlockJob *job, int ret) 663*88691b37SPaolo Bonzini { 664*88691b37SPaolo Bonzini assert(blk_bs(job->blk)->job == job); 665*88691b37SPaolo Bonzini assert(!job->completed); 666*88691b37SPaolo Bonzini job->completed = true; 667*88691b37SPaolo Bonzini job->ret = ret; 668*88691b37SPaolo Bonzini if (!job->txn) { 669*88691b37SPaolo Bonzini block_job_completed_single(job); 670*88691b37SPaolo Bonzini } else if (ret < 0 || block_job_is_cancelled(job)) { 671*88691b37SPaolo Bonzini block_job_completed_txn_abort(job); 672*88691b37SPaolo Bonzini } else { 673*88691b37SPaolo Bonzini block_job_completed_txn_success(job); 674*88691b37SPaolo Bonzini } 675*88691b37SPaolo Bonzini } 676*88691b37SPaolo Bonzini 677*88691b37SPaolo Bonzini static bool block_job_should_pause(BlockJob *job) 678*88691b37SPaolo Bonzini { 679*88691b37SPaolo Bonzini return job->pause_count > 0; 680*88691b37SPaolo Bonzini } 681*88691b37SPaolo Bonzini 682*88691b37SPaolo Bonzini void coroutine_fn block_job_pause_point(BlockJob *job) 683*88691b37SPaolo Bonzini { 684*88691b37SPaolo Bonzini assert(job && block_job_started(job)); 685*88691b37SPaolo Bonzini 686*88691b37SPaolo Bonzini if (!block_job_should_pause(job)) { 687*88691b37SPaolo Bonzini return; 688*88691b37SPaolo Bonzini } 689*88691b37SPaolo Bonzini if (block_job_is_cancelled(job)) { 690*88691b37SPaolo Bonzini return; 691*88691b37SPaolo Bonzini } 692*88691b37SPaolo Bonzini 693*88691b37SPaolo Bonzini if (job->driver->pause) { 694*88691b37SPaolo Bonzini job->driver->pause(job); 695*88691b37SPaolo Bonzini } 696*88691b37SPaolo Bonzini 697*88691b37SPaolo Bonzini if (block_job_should_pause(job) && !block_job_is_cancelled(job)) { 698*88691b37SPaolo Bonzini job->paused = true; 699*88691b37SPaolo Bonzini job->busy = false; 700*88691b37SPaolo Bonzini qemu_coroutine_yield(); /* wait for block_job_resume() */ 701*88691b37SPaolo Bonzini job->busy = true; 702*88691b37SPaolo Bonzini job->paused = false; 703*88691b37SPaolo Bonzini } 704*88691b37SPaolo Bonzini 705*88691b37SPaolo Bonzini if (job->driver->resume) { 706*88691b37SPaolo Bonzini job->driver->resume(job); 707*88691b37SPaolo Bonzini } 708*88691b37SPaolo Bonzini } 709*88691b37SPaolo Bonzini 710f321dcb5SPaolo Bonzini void block_job_resume_all(void) 711f321dcb5SPaolo Bonzini { 712f321dcb5SPaolo Bonzini BlockJob *job = NULL; 713f321dcb5SPaolo Bonzini while ((job = block_job_next(job))) { 714f321dcb5SPaolo Bonzini AioContext *aio_context = blk_get_aio_context(job->blk); 715f321dcb5SPaolo Bonzini 716f321dcb5SPaolo Bonzini aio_context_acquire(aio_context); 717f321dcb5SPaolo Bonzini block_job_resume(job); 718f321dcb5SPaolo Bonzini aio_context_release(aio_context); 719f321dcb5SPaolo Bonzini } 720f321dcb5SPaolo Bonzini } 721f321dcb5SPaolo Bonzini 722*88691b37SPaolo Bonzini void block_job_enter(BlockJob *job) 723*88691b37SPaolo Bonzini { 724*88691b37SPaolo Bonzini if (job->co && !job->busy) { 725*88691b37SPaolo Bonzini bdrv_coroutine_enter(blk_bs(job->blk), job->co); 726*88691b37SPaolo Bonzini } 727*88691b37SPaolo Bonzini } 728*88691b37SPaolo Bonzini 729*88691b37SPaolo Bonzini bool block_job_is_cancelled(BlockJob *job) 730*88691b37SPaolo Bonzini { 731*88691b37SPaolo Bonzini return job->cancelled; 732*88691b37SPaolo Bonzini } 733*88691b37SPaolo Bonzini 734*88691b37SPaolo Bonzini void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns) 735*88691b37SPaolo Bonzini { 736*88691b37SPaolo Bonzini assert(job->busy); 737*88691b37SPaolo Bonzini 738*88691b37SPaolo Bonzini /* Check cancellation *before* setting busy = false, too! */ 739*88691b37SPaolo Bonzini if (block_job_is_cancelled(job)) { 740*88691b37SPaolo Bonzini return; 741*88691b37SPaolo Bonzini } 742*88691b37SPaolo Bonzini 743*88691b37SPaolo Bonzini job->busy = false; 744*88691b37SPaolo Bonzini if (!block_job_should_pause(job)) { 745*88691b37SPaolo Bonzini co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns); 746*88691b37SPaolo Bonzini } 747*88691b37SPaolo Bonzini job->busy = true; 748*88691b37SPaolo Bonzini 749*88691b37SPaolo Bonzini block_job_pause_point(job); 750*88691b37SPaolo Bonzini } 751*88691b37SPaolo Bonzini 752*88691b37SPaolo Bonzini void block_job_yield(BlockJob *job) 753*88691b37SPaolo Bonzini { 754*88691b37SPaolo Bonzini assert(job->busy); 755*88691b37SPaolo Bonzini 756*88691b37SPaolo Bonzini /* Check cancellation *before* setting busy = false, too! */ 757*88691b37SPaolo Bonzini if (block_job_is_cancelled(job)) { 758*88691b37SPaolo Bonzini return; 759*88691b37SPaolo Bonzini } 760*88691b37SPaolo Bonzini 761*88691b37SPaolo Bonzini job->busy = false; 762*88691b37SPaolo Bonzini if (!block_job_should_pause(job)) { 763*88691b37SPaolo Bonzini qemu_coroutine_yield(); 764*88691b37SPaolo Bonzini } 765*88691b37SPaolo Bonzini job->busy = true; 766*88691b37SPaolo Bonzini 767*88691b37SPaolo Bonzini block_job_pause_point(job); 768*88691b37SPaolo Bonzini } 769*88691b37SPaolo Bonzini 770bcada37bSWenchao Xia void block_job_event_ready(BlockJob *job) 771bcada37bSWenchao Xia { 772ef6dbf1eSMax Reitz job->ready = true; 773ef6dbf1eSMax Reitz 774559b935fSJohn Snow if (block_job_is_internal(job)) { 775559b935fSJohn Snow return; 776559b935fSJohn Snow } 777559b935fSJohn Snow 778518848a2SMarkus Armbruster qapi_event_send_block_job_ready(job->driver->job_type, 7798ccb9569SKevin Wolf job->id, 780518848a2SMarkus Armbruster job->len, 781518848a2SMarkus Armbruster job->offset, 782518848a2SMarkus Armbruster job->speed, &error_abort); 783a66a2a36SPaolo Bonzini } 784a66a2a36SPaolo Bonzini 78581e254dcSKevin Wolf BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err, 78632c81a4aSPaolo Bonzini int is_read, int error) 78732c81a4aSPaolo Bonzini { 78832c81a4aSPaolo Bonzini BlockErrorAction action; 78932c81a4aSPaolo Bonzini 79032c81a4aSPaolo Bonzini switch (on_err) { 79132c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_ENOSPC: 7928c398252SKevin Wolf case BLOCKDEV_ON_ERROR_AUTO: 793a589569fSWenchao Xia action = (error == ENOSPC) ? 794a589569fSWenchao Xia BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; 79532c81a4aSPaolo Bonzini break; 79632c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_STOP: 797a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_STOP; 79832c81a4aSPaolo Bonzini break; 79932c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_REPORT: 800a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_REPORT; 80132c81a4aSPaolo Bonzini break; 80232c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_IGNORE: 803a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_IGNORE; 80432c81a4aSPaolo Bonzini break; 80532c81a4aSPaolo Bonzini default: 80632c81a4aSPaolo Bonzini abort(); 80732c81a4aSPaolo Bonzini } 808559b935fSJohn Snow if (!block_job_is_internal(job)) { 8098ccb9569SKevin Wolf qapi_event_send_block_job_error(job->id, 8105a2d2cbdSWenchao Xia is_read ? IO_OPERATION_TYPE_READ : 8115a2d2cbdSWenchao Xia IO_OPERATION_TYPE_WRITE, 8125a2d2cbdSWenchao Xia action, &error_abort); 813559b935fSJohn Snow } 814a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_STOP) { 815751ebd76SFam Zheng /* make the pause user visible, which will be resumed from QMP. */ 8160df4ba58SJohn Snow block_job_user_pause(job); 81732c81a4aSPaolo Bonzini block_job_iostatus_set_err(job, error); 81832c81a4aSPaolo Bonzini } 81932c81a4aSPaolo Bonzini return action; 82032c81a4aSPaolo Bonzini } 821dec7d421SStefan Hajnoczi 822dec7d421SStefan Hajnoczi typedef struct { 823dec7d421SStefan Hajnoczi BlockJob *job; 824dec7d421SStefan Hajnoczi AioContext *aio_context; 825dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopFn *fn; 826dec7d421SStefan Hajnoczi void *opaque; 827dec7d421SStefan Hajnoczi } BlockJobDeferToMainLoopData; 828dec7d421SStefan Hajnoczi 829dec7d421SStefan Hajnoczi static void block_job_defer_to_main_loop_bh(void *opaque) 830dec7d421SStefan Hajnoczi { 831dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopData *data = opaque; 832dec7d421SStefan Hajnoczi AioContext *aio_context; 833dec7d421SStefan Hajnoczi 834dec7d421SStefan Hajnoczi /* Prevent race with block_job_defer_to_main_loop() */ 835dec7d421SStefan Hajnoczi aio_context_acquire(data->aio_context); 836dec7d421SStefan Hajnoczi 837dec7d421SStefan Hajnoczi /* Fetch BDS AioContext again, in case it has changed */ 838b6d2e599SKevin Wolf aio_context = blk_get_aio_context(data->job->blk); 839d79df2a2SPaolo Bonzini if (aio_context != data->aio_context) { 840dec7d421SStefan Hajnoczi aio_context_acquire(aio_context); 841d79df2a2SPaolo Bonzini } 842dec7d421SStefan Hajnoczi 843794f0141SFam Zheng data->job->deferred_to_main_loop = false; 844dec7d421SStefan Hajnoczi data->fn(data->job, data->opaque); 845dec7d421SStefan Hajnoczi 846d79df2a2SPaolo Bonzini if (aio_context != data->aio_context) { 847dec7d421SStefan Hajnoczi aio_context_release(aio_context); 848d79df2a2SPaolo Bonzini } 849dec7d421SStefan Hajnoczi 850dec7d421SStefan Hajnoczi aio_context_release(data->aio_context); 851dec7d421SStefan Hajnoczi 852dec7d421SStefan Hajnoczi g_free(data); 853dec7d421SStefan Hajnoczi } 854dec7d421SStefan Hajnoczi 855dec7d421SStefan Hajnoczi void block_job_defer_to_main_loop(BlockJob *job, 856dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopFn *fn, 857dec7d421SStefan Hajnoczi void *opaque) 858dec7d421SStefan Hajnoczi { 859dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); 860dec7d421SStefan Hajnoczi data->job = job; 861b6d2e599SKevin Wolf data->aio_context = blk_get_aio_context(job->blk); 862dec7d421SStefan Hajnoczi data->fn = fn; 863dec7d421SStefan Hajnoczi data->opaque = opaque; 864794f0141SFam Zheng job->deferred_to_main_loop = true; 865dec7d421SStefan Hajnoczi 866fffb6e12SPaolo Bonzini aio_bh_schedule_oneshot(qemu_get_aio_context(), 867fffb6e12SPaolo Bonzini block_job_defer_to_main_loop_bh, data); 868dec7d421SStefan Hajnoczi } 869c55a832fSFam Zheng 870c55a832fSFam Zheng BlockJobTxn *block_job_txn_new(void) 871c55a832fSFam Zheng { 872c55a832fSFam Zheng BlockJobTxn *txn = g_new0(BlockJobTxn, 1); 873c55a832fSFam Zheng QLIST_INIT(&txn->jobs); 874c55a832fSFam Zheng txn->refcnt = 1; 875c55a832fSFam Zheng return txn; 876c55a832fSFam Zheng } 877c55a832fSFam Zheng 878c55a832fSFam Zheng static void block_job_txn_ref(BlockJobTxn *txn) 879c55a832fSFam Zheng { 880c55a832fSFam Zheng txn->refcnt++; 881c55a832fSFam Zheng } 882c55a832fSFam Zheng 883c55a832fSFam Zheng void block_job_txn_unref(BlockJobTxn *txn) 884c55a832fSFam Zheng { 885c55a832fSFam Zheng if (txn && --txn->refcnt == 0) { 886c55a832fSFam Zheng g_free(txn); 887c55a832fSFam Zheng } 888c55a832fSFam Zheng } 889c55a832fSFam Zheng 890c55a832fSFam Zheng void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job) 891c55a832fSFam Zheng { 892c55a832fSFam Zheng if (!txn) { 893c55a832fSFam Zheng return; 894c55a832fSFam Zheng } 895c55a832fSFam Zheng 896c55a832fSFam Zheng assert(!job->txn); 897c55a832fSFam Zheng job->txn = txn; 898c55a832fSFam Zheng 899c55a832fSFam Zheng QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); 900c55a832fSFam Zheng block_job_txn_ref(txn); 901c55a832fSFam Zheng } 902