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*76d554e2SKevin Wolf static char *child_job_get_parent_desc(BdrvChild *c) 59*76d554e2SKevin Wolf { 60*76d554e2SKevin Wolf BlockJob *job = c->opaque; 61*76d554e2SKevin Wolf return g_strdup_printf("%s job '%s'", 62*76d554e2SKevin Wolf BlockJobType_lookup[job->driver->job_type], 63*76d554e2SKevin Wolf job->id); 64*76d554e2SKevin Wolf } 65*76d554e2SKevin Wolf 66*76d554e2SKevin Wolf static const BdrvChildRole child_job = { 67*76d554e2SKevin Wolf .get_parent_desc = child_job_get_parent_desc, 68*76d554e2SKevin Wolf .stay_at_node = true, 69*76d554e2SKevin Wolf }; 70*76d554e2SKevin Wolf 71a7112795SAlberto Garcia BlockJob *block_job_next(BlockJob *job) 72a7112795SAlberto Garcia { 73a7112795SAlberto Garcia if (!job) { 74a7112795SAlberto Garcia return QLIST_FIRST(&block_jobs); 75a7112795SAlberto Garcia } 76a7112795SAlberto Garcia return QLIST_NEXT(job, job_list); 77a7112795SAlberto Garcia } 78a7112795SAlberto Garcia 79ffb1f10cSAlberto Garcia BlockJob *block_job_get(const char *id) 80ffb1f10cSAlberto Garcia { 81ffb1f10cSAlberto Garcia BlockJob *job; 82ffb1f10cSAlberto Garcia 83ffb1f10cSAlberto Garcia QLIST_FOREACH(job, &block_jobs, job_list) { 84559b935fSJohn Snow if (job->id && !strcmp(id, job->id)) { 85ffb1f10cSAlberto Garcia return job; 86ffb1f10cSAlberto Garcia } 87ffb1f10cSAlberto Garcia } 88ffb1f10cSAlberto Garcia 89ffb1f10cSAlberto Garcia return NULL; 90ffb1f10cSAlberto Garcia } 91ffb1f10cSAlberto Garcia 92463e0be1SStefan Hajnoczi static void block_job_attached_aio_context(AioContext *new_context, 93463e0be1SStefan Hajnoczi void *opaque) 94463e0be1SStefan Hajnoczi { 95463e0be1SStefan Hajnoczi BlockJob *job = opaque; 96463e0be1SStefan Hajnoczi 97463e0be1SStefan Hajnoczi if (job->driver->attached_aio_context) { 98463e0be1SStefan Hajnoczi job->driver->attached_aio_context(job, new_context); 99463e0be1SStefan Hajnoczi } 100463e0be1SStefan Hajnoczi 101463e0be1SStefan Hajnoczi block_job_resume(job); 102463e0be1SStefan Hajnoczi } 103463e0be1SStefan Hajnoczi 104bae8196dSPaolo Bonzini static void block_job_drain(BlockJob *job) 105bae8196dSPaolo Bonzini { 106bae8196dSPaolo Bonzini /* If job is !job->busy this kicks it into the next pause point. */ 107bae8196dSPaolo Bonzini block_job_enter(job); 108bae8196dSPaolo Bonzini 109bae8196dSPaolo Bonzini blk_drain(job->blk); 110bae8196dSPaolo Bonzini if (job->driver->drain) { 111bae8196dSPaolo Bonzini job->driver->drain(job); 112bae8196dSPaolo Bonzini } 113bae8196dSPaolo Bonzini } 114bae8196dSPaolo Bonzini 115463e0be1SStefan Hajnoczi static void block_job_detach_aio_context(void *opaque) 116463e0be1SStefan Hajnoczi { 117463e0be1SStefan Hajnoczi BlockJob *job = opaque; 118463e0be1SStefan Hajnoczi 119463e0be1SStefan Hajnoczi /* In case the job terminates during aio_poll()... */ 120463e0be1SStefan Hajnoczi block_job_ref(job); 121463e0be1SStefan Hajnoczi 122463e0be1SStefan Hajnoczi block_job_pause(job); 123463e0be1SStefan Hajnoczi 124463e0be1SStefan Hajnoczi while (!job->paused && !job->completed) { 125bae8196dSPaolo Bonzini block_job_drain(job); 126463e0be1SStefan Hajnoczi } 127463e0be1SStefan Hajnoczi 128463e0be1SStefan Hajnoczi block_job_unref(job); 129463e0be1SStefan Hajnoczi } 130463e0be1SStefan Hajnoczi 131*76d554e2SKevin Wolf int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs, 132*76d554e2SKevin Wolf uint64_t perm, uint64_t shared_perm, Error **errp) 13323d402d4SAlberto Garcia { 134*76d554e2SKevin Wolf BdrvChild *c; 135*76d554e2SKevin Wolf 136*76d554e2SKevin Wolf c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm, 137*76d554e2SKevin Wolf job, errp); 138*76d554e2SKevin Wolf if (c == NULL) { 139*76d554e2SKevin Wolf return -EPERM; 140*76d554e2SKevin Wolf } 141*76d554e2SKevin Wolf 142*76d554e2SKevin Wolf job->nodes = g_slist_prepend(job->nodes, c); 14323d402d4SAlberto Garcia bdrv_ref(bs); 14423d402d4SAlberto Garcia bdrv_op_block_all(bs, job->blocker); 145*76d554e2SKevin Wolf 146*76d554e2SKevin Wolf return 0; 14723d402d4SAlberto Garcia } 14823d402d4SAlberto Garcia 1497f0317cfSAlberto Garcia void *block_job_create(const char *job_id, const BlockJobDriver *driver, 150c6cc12bfSKevin Wolf BlockDriverState *bs, uint64_t perm, 151c6cc12bfSKevin Wolf uint64_t shared_perm, int64_t speed, int flags, 1527f0317cfSAlberto Garcia BlockCompletionFunc *cb, void *opaque, Error **errp) 1532f0c9fe6SPaolo Bonzini { 154b6d2e599SKevin Wolf BlockBackend *blk; 1552f0c9fe6SPaolo Bonzini BlockJob *job; 156d7086422SKevin Wolf int ret; 1572f0c9fe6SPaolo Bonzini 158628ff683SFam Zheng if (bs->job) { 159c6bd8c70SMarkus Armbruster error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 1602f0c9fe6SPaolo Bonzini return NULL; 1612f0c9fe6SPaolo Bonzini } 162b6d2e599SKevin Wolf 163f81e0b45SJohn Snow if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) { 1647f0317cfSAlberto Garcia job_id = bdrv_get_device_name(bs); 1651562047cSKevin Wolf if (!*job_id) { 1661562047cSKevin Wolf error_setg(errp, "An explicit job ID is required for this node"); 1671562047cSKevin Wolf return NULL; 1681562047cSKevin Wolf } 1697f0317cfSAlberto Garcia } 1707f0317cfSAlberto Garcia 171f81e0b45SJohn Snow if (job_id) { 172f81e0b45SJohn Snow if (flags & BLOCK_JOB_INTERNAL) { 173f81e0b45SJohn Snow error_setg(errp, "Cannot specify job ID for internal block job"); 174f81e0b45SJohn Snow return NULL; 175f81e0b45SJohn Snow } 176f81e0b45SJohn Snow 1777f0317cfSAlberto Garcia if (!id_wellformed(job_id)) { 1787f0317cfSAlberto Garcia error_setg(errp, "Invalid job ID '%s'", job_id); 1797f0317cfSAlberto Garcia return NULL; 1807f0317cfSAlberto Garcia } 1817f0317cfSAlberto Garcia 1827f0317cfSAlberto Garcia if (block_job_get(job_id)) { 1837f0317cfSAlberto Garcia error_setg(errp, "Job ID '%s' already in use", job_id); 1847f0317cfSAlberto Garcia return NULL; 1857f0317cfSAlberto Garcia } 186f81e0b45SJohn Snow } 1877f0317cfSAlberto Garcia 188c6cc12bfSKevin Wolf blk = blk_new(perm, shared_perm); 189d7086422SKevin Wolf ret = blk_insert_bs(blk, bs, errp); 190d7086422SKevin Wolf if (ret < 0) { 191d7086422SKevin Wolf blk_unref(blk); 192d7086422SKevin Wolf return NULL; 193d7086422SKevin Wolf } 194b6d2e599SKevin Wolf 1953fc4b10aSFam Zheng job = g_malloc0(driver->instance_size); 1963718d8abSFam Zheng error_setg(&job->blocker, "block device is in use by block job: %s", 1973718d8abSFam Zheng BlockJobType_lookup[driver->job_type]); 198*76d554e2SKevin Wolf block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort); 199b112a65cSStefan Hajnoczi bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker); 2003718d8abSFam Zheng 2013fc4b10aSFam Zheng job->driver = driver; 2027f0317cfSAlberto Garcia job->id = g_strdup(job_id); 203b6d2e599SKevin Wolf job->blk = blk; 2042f0c9fe6SPaolo Bonzini job->cb = cb; 2052f0c9fe6SPaolo Bonzini job->opaque = opaque; 2065ccac6f1SJohn Snow job->busy = false; 2075ccac6f1SJohn Snow job->paused = true; 2085ccac6f1SJohn Snow job->pause_count = 1; 20918930ba3SFam Zheng job->refcnt = 1; 2102f0c9fe6SPaolo Bonzini bs->job = job; 2112f0c9fe6SPaolo Bonzini 212a7112795SAlberto Garcia QLIST_INSERT_HEAD(&block_jobs, job, job_list); 213a7112795SAlberto Garcia 214463e0be1SStefan Hajnoczi blk_add_aio_context_notifier(blk, block_job_attached_aio_context, 215463e0be1SStefan Hajnoczi block_job_detach_aio_context, job); 216463e0be1SStefan Hajnoczi 2172f0c9fe6SPaolo Bonzini /* Only set speed when necessary to avoid NotSupported error */ 2182f0c9fe6SPaolo Bonzini if (speed != 0) { 2192f0c9fe6SPaolo Bonzini Error *local_err = NULL; 2202f0c9fe6SPaolo Bonzini 2212f0c9fe6SPaolo Bonzini block_job_set_speed(job, speed, &local_err); 22284d18f06SMarkus Armbruster if (local_err) { 22318930ba3SFam Zheng block_job_unref(job); 2242f0c9fe6SPaolo Bonzini error_propagate(errp, local_err); 2252f0c9fe6SPaolo Bonzini return NULL; 2262f0c9fe6SPaolo Bonzini } 2272f0c9fe6SPaolo Bonzini } 2282f0c9fe6SPaolo Bonzini return job; 2292f0c9fe6SPaolo Bonzini } 2302f0c9fe6SPaolo Bonzini 231559b935fSJohn Snow bool block_job_is_internal(BlockJob *job) 232559b935fSJohn Snow { 233559b935fSJohn Snow return (job->id == NULL); 234559b935fSJohn Snow } 235559b935fSJohn Snow 2365ccac6f1SJohn Snow static bool block_job_started(BlockJob *job) 2375ccac6f1SJohn Snow { 2385ccac6f1SJohn Snow return job->co; 2395ccac6f1SJohn Snow } 2405ccac6f1SJohn Snow 2415ccac6f1SJohn Snow void block_job_start(BlockJob *job) 2425ccac6f1SJohn Snow { 2435ccac6f1SJohn Snow assert(job && !block_job_started(job) && job->paused && 2445ccac6f1SJohn Snow !job->busy && job->driver->start); 2455ccac6f1SJohn Snow job->co = qemu_coroutine_create(job->driver->start, job); 2465ccac6f1SJohn Snow if (--job->pause_count == 0) { 2475ccac6f1SJohn Snow job->paused = false; 2485ccac6f1SJohn Snow job->busy = true; 2495ccac6f1SJohn Snow qemu_coroutine_enter(job->co); 2505ccac6f1SJohn Snow } 2515ccac6f1SJohn Snow } 2525ccac6f1SJohn Snow 25318930ba3SFam Zheng void block_job_ref(BlockJob *job) 25497031164STing Wang { 25518930ba3SFam Zheng ++job->refcnt; 25618930ba3SFam Zheng } 25797031164STing Wang 25818930ba3SFam Zheng void block_job_unref(BlockJob *job) 25918930ba3SFam Zheng { 26018930ba3SFam Zheng if (--job->refcnt == 0) { 26123d402d4SAlberto Garcia GSList *l; 262b6d2e599SKevin Wolf BlockDriverState *bs = blk_bs(job->blk); 263b6d2e599SKevin Wolf bs->job = NULL; 26423d402d4SAlberto Garcia for (l = job->nodes; l; l = l->next) { 265*76d554e2SKevin Wolf BdrvChild *c = l->data; 266*76d554e2SKevin Wolf bdrv_op_unblock_all(c->bs, job->blocker); 267*76d554e2SKevin Wolf bdrv_root_unref_child(c); 26823d402d4SAlberto Garcia } 26923d402d4SAlberto Garcia g_slist_free(job->nodes); 270463e0be1SStefan Hajnoczi blk_remove_aio_context_notifier(job->blk, 271463e0be1SStefan Hajnoczi block_job_attached_aio_context, 272463e0be1SStefan Hajnoczi block_job_detach_aio_context, job); 273b6d2e599SKevin Wolf blk_unref(job->blk); 27497031164STing Wang error_free(job->blocker); 2758ccb9569SKevin Wolf g_free(job->id); 276a7112795SAlberto Garcia QLIST_REMOVE(job, job_list); 27797031164STing Wang g_free(job); 27897031164STing Wang } 27918930ba3SFam Zheng } 28097031164STing Wang 281c55a832fSFam Zheng static void block_job_completed_single(BlockJob *job) 282c55a832fSFam Zheng { 283c55a832fSFam Zheng if (!job->ret) { 284c55a832fSFam Zheng if (job->driver->commit) { 285c55a832fSFam Zheng job->driver->commit(job); 286c55a832fSFam Zheng } 287c55a832fSFam Zheng } else { 288c55a832fSFam Zheng if (job->driver->abort) { 289c55a832fSFam Zheng job->driver->abort(job); 290c55a832fSFam Zheng } 291c55a832fSFam Zheng } 292e8a40bf7SJohn Snow if (job->driver->clean) { 293e8a40bf7SJohn Snow job->driver->clean(job); 294e8a40bf7SJohn Snow } 2958254b6d9SJohn Snow 2968254b6d9SJohn Snow if (job->cb) { 297c55a832fSFam Zheng job->cb(job->opaque, job->ret); 2988254b6d9SJohn Snow } 2995ccac6f1SJohn Snow 3005ccac6f1SJohn Snow /* Emit events only if we actually started */ 3015ccac6f1SJohn Snow if (block_job_started(job)) { 3028254b6d9SJohn Snow if (block_job_is_cancelled(job)) { 3038254b6d9SJohn Snow block_job_event_cancelled(job); 3048254b6d9SJohn Snow } else { 3058254b6d9SJohn Snow const char *msg = NULL; 3068254b6d9SJohn Snow if (job->ret < 0) { 3078254b6d9SJohn Snow msg = strerror(-job->ret); 3088254b6d9SJohn Snow } 3098254b6d9SJohn Snow block_job_event_completed(job, msg); 3108254b6d9SJohn Snow } 3115ccac6f1SJohn Snow } 3128254b6d9SJohn Snow 313c55a832fSFam Zheng if (job->txn) { 3141e93b9fbSVladimir Sementsov-Ogievskiy QLIST_REMOVE(job, txn_list); 315c55a832fSFam Zheng block_job_txn_unref(job->txn); 316c55a832fSFam Zheng } 317c55a832fSFam Zheng block_job_unref(job); 318c55a832fSFam Zheng } 319c55a832fSFam Zheng 320c55a832fSFam Zheng static void block_job_completed_txn_abort(BlockJob *job) 321c55a832fSFam Zheng { 322c55a832fSFam Zheng AioContext *ctx; 323c55a832fSFam Zheng BlockJobTxn *txn = job->txn; 324c55a832fSFam Zheng BlockJob *other_job, *next; 325c55a832fSFam Zheng 326c55a832fSFam Zheng if (txn->aborting) { 327c55a832fSFam Zheng /* 328c55a832fSFam Zheng * We are cancelled by another job, which will handle everything. 329c55a832fSFam Zheng */ 330c55a832fSFam Zheng return; 331c55a832fSFam Zheng } 332c55a832fSFam Zheng txn->aborting = true; 333c55a832fSFam Zheng /* We are the first failed job. Cancel other jobs. */ 334c55a832fSFam Zheng QLIST_FOREACH(other_job, &txn->jobs, txn_list) { 335b6d2e599SKevin Wolf ctx = blk_get_aio_context(other_job->blk); 336c55a832fSFam Zheng aio_context_acquire(ctx); 337c55a832fSFam Zheng } 338c55a832fSFam Zheng QLIST_FOREACH(other_job, &txn->jobs, txn_list) { 339c55a832fSFam Zheng if (other_job == job || other_job->completed) { 340c55a832fSFam Zheng /* Other jobs are "effectively" cancelled by us, set the status for 341c55a832fSFam Zheng * them; this job, however, may or may not be cancelled, depending 342c55a832fSFam Zheng * on the caller, so leave it. */ 343c55a832fSFam Zheng if (other_job != job) { 344c55a832fSFam Zheng other_job->cancelled = true; 345c55a832fSFam Zheng } 346c55a832fSFam Zheng continue; 347c55a832fSFam Zheng } 348c55a832fSFam Zheng block_job_cancel_sync(other_job); 349c55a832fSFam Zheng assert(other_job->completed); 350c55a832fSFam Zheng } 351c55a832fSFam Zheng QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { 352b6d2e599SKevin Wolf ctx = blk_get_aio_context(other_job->blk); 353c55a832fSFam Zheng block_job_completed_single(other_job); 354c55a832fSFam Zheng aio_context_release(ctx); 355c55a832fSFam Zheng } 356c55a832fSFam Zheng } 357c55a832fSFam Zheng 358c55a832fSFam Zheng static void block_job_completed_txn_success(BlockJob *job) 359c55a832fSFam Zheng { 360c55a832fSFam Zheng AioContext *ctx; 361c55a832fSFam Zheng BlockJobTxn *txn = job->txn; 362c55a832fSFam Zheng BlockJob *other_job, *next; 363c55a832fSFam Zheng /* 364c55a832fSFam Zheng * Successful completion, see if there are other running jobs in this 365c55a832fSFam Zheng * txn. 366c55a832fSFam Zheng */ 367c55a832fSFam Zheng QLIST_FOREACH(other_job, &txn->jobs, txn_list) { 368c55a832fSFam Zheng if (!other_job->completed) { 369c55a832fSFam Zheng return; 370c55a832fSFam Zheng } 371c55a832fSFam Zheng } 372c55a832fSFam Zheng /* We are the last completed job, commit the transaction. */ 373c55a832fSFam Zheng QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) { 374b6d2e599SKevin Wolf ctx = blk_get_aio_context(other_job->blk); 375c55a832fSFam Zheng aio_context_acquire(ctx); 376c55a832fSFam Zheng assert(other_job->ret == 0); 377c55a832fSFam Zheng block_job_completed_single(other_job); 378c55a832fSFam Zheng aio_context_release(ctx); 379c55a832fSFam Zheng } 380c55a832fSFam Zheng } 381c55a832fSFam Zheng 38265f46322SPaolo Bonzini void block_job_completed(BlockJob *job, int ret) 3832f0c9fe6SPaolo Bonzini { 384b6d2e599SKevin Wolf assert(blk_bs(job->blk)->job == job); 385a689dbf2SFam Zheng assert(!job->completed); 386a689dbf2SFam Zheng job->completed = true; 387a689dbf2SFam Zheng job->ret = ret; 388c55a832fSFam Zheng if (!job->txn) { 389c55a832fSFam Zheng block_job_completed_single(job); 390c55a832fSFam Zheng } else if (ret < 0 || block_job_is_cancelled(job)) { 391c55a832fSFam Zheng block_job_completed_txn_abort(job); 392c55a832fSFam Zheng } else { 393c55a832fSFam Zheng block_job_completed_txn_success(job); 394c55a832fSFam Zheng } 3952f0c9fe6SPaolo Bonzini } 3962f0c9fe6SPaolo Bonzini 3972f0c9fe6SPaolo Bonzini void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) 3982f0c9fe6SPaolo Bonzini { 3992f0c9fe6SPaolo Bonzini Error *local_err = NULL; 4002f0c9fe6SPaolo Bonzini 4013fc4b10aSFam Zheng if (!job->driver->set_speed) { 402c6bd8c70SMarkus Armbruster error_setg(errp, QERR_UNSUPPORTED); 4032f0c9fe6SPaolo Bonzini return; 4042f0c9fe6SPaolo Bonzini } 4053fc4b10aSFam Zheng job->driver->set_speed(job, speed, &local_err); 40684d18f06SMarkus Armbruster if (local_err) { 4072f0c9fe6SPaolo Bonzini error_propagate(errp, local_err); 4082f0c9fe6SPaolo Bonzini return; 4092f0c9fe6SPaolo Bonzini } 4102f0c9fe6SPaolo Bonzini 4112f0c9fe6SPaolo Bonzini job->speed = speed; 4122f0c9fe6SPaolo Bonzini } 4132f0c9fe6SPaolo Bonzini 414aeae883bSPaolo Bonzini void block_job_complete(BlockJob *job, Error **errp) 415aeae883bSPaolo Bonzini { 416559b935fSJohn Snow /* Should not be reachable via external interface for internal jobs */ 417559b935fSJohn Snow assert(job->id); 4185ccac6f1SJohn Snow if (job->pause_count || job->cancelled || 4195ccac6f1SJohn Snow !block_job_started(job) || !job->driver->complete) { 4209df229c3SAlberto Garcia error_setg(errp, "The active block job '%s' cannot be completed", 4219df229c3SAlberto Garcia job->id); 422aeae883bSPaolo Bonzini return; 423aeae883bSPaolo Bonzini } 424aeae883bSPaolo Bonzini 4253fc4b10aSFam Zheng job->driver->complete(job, errp); 426aeae883bSPaolo Bonzini } 427aeae883bSPaolo Bonzini 4288acc72a4SPaolo Bonzini void block_job_pause(BlockJob *job) 4292f0c9fe6SPaolo Bonzini { 430751ebd76SFam Zheng job->pause_count++; 4318acc72a4SPaolo Bonzini } 4328acc72a4SPaolo Bonzini 4330df4ba58SJohn Snow void block_job_user_pause(BlockJob *job) 4340df4ba58SJohn Snow { 4350df4ba58SJohn Snow job->user_paused = true; 4360df4ba58SJohn Snow block_job_pause(job); 4370df4ba58SJohn Snow } 4380df4ba58SJohn Snow 439a7f3b7ffSStefan Hajnoczi static bool block_job_should_pause(BlockJob *job) 4408acc72a4SPaolo Bonzini { 441751ebd76SFam Zheng return job->pause_count > 0; 4428acc72a4SPaolo Bonzini } 4438acc72a4SPaolo Bonzini 4440df4ba58SJohn Snow bool block_job_user_paused(BlockJob *job) 4450df4ba58SJohn Snow { 4460df4ba58SJohn Snow return job ? job->user_paused : 0; 4470df4ba58SJohn Snow } 4480df4ba58SJohn Snow 449fc9c0a9cSStefan Hajnoczi void coroutine_fn block_job_pause_point(BlockJob *job) 450fc9c0a9cSStefan Hajnoczi { 4515ccac6f1SJohn Snow assert(job && block_job_started(job)); 4525ccac6f1SJohn Snow 453fc9c0a9cSStefan Hajnoczi if (!block_job_should_pause(job)) { 454fc9c0a9cSStefan Hajnoczi return; 455fc9c0a9cSStefan Hajnoczi } 456fc9c0a9cSStefan Hajnoczi if (block_job_is_cancelled(job)) { 457fc9c0a9cSStefan Hajnoczi return; 458fc9c0a9cSStefan Hajnoczi } 459fc9c0a9cSStefan Hajnoczi 460fc9c0a9cSStefan Hajnoczi if (job->driver->pause) { 461fc9c0a9cSStefan Hajnoczi job->driver->pause(job); 462fc9c0a9cSStefan Hajnoczi } 463fc9c0a9cSStefan Hajnoczi 464fc9c0a9cSStefan Hajnoczi if (block_job_should_pause(job) && !block_job_is_cancelled(job)) { 465fc9c0a9cSStefan Hajnoczi job->paused = true; 466fc9c0a9cSStefan Hajnoczi job->busy = false; 467fc9c0a9cSStefan Hajnoczi qemu_coroutine_yield(); /* wait for block_job_resume() */ 468fc9c0a9cSStefan Hajnoczi job->busy = true; 469fc9c0a9cSStefan Hajnoczi job->paused = false; 470fc9c0a9cSStefan Hajnoczi } 471fc9c0a9cSStefan Hajnoczi 472fc9c0a9cSStefan Hajnoczi if (job->driver->resume) { 473fc9c0a9cSStefan Hajnoczi job->driver->resume(job); 474fc9c0a9cSStefan Hajnoczi } 475fc9c0a9cSStefan Hajnoczi } 476fc9c0a9cSStefan Hajnoczi 4778acc72a4SPaolo Bonzini void block_job_resume(BlockJob *job) 4788acc72a4SPaolo Bonzini { 479751ebd76SFam Zheng assert(job->pause_count > 0); 480751ebd76SFam Zheng job->pause_count--; 481751ebd76SFam Zheng if (job->pause_count) { 482751ebd76SFam Zheng return; 483751ebd76SFam Zheng } 484751ebd76SFam Zheng block_job_enter(job); 485751ebd76SFam Zheng } 486751ebd76SFam Zheng 4870df4ba58SJohn Snow void block_job_user_resume(BlockJob *job) 4880df4ba58SJohn Snow { 4890df4ba58SJohn Snow if (job && job->user_paused && job->pause_count > 0) { 4900df4ba58SJohn Snow job->user_paused = false; 4910df4ba58SJohn Snow block_job_resume(job); 4920df4ba58SJohn Snow } 4930df4ba58SJohn Snow } 4940df4ba58SJohn Snow 495751ebd76SFam Zheng void block_job_enter(BlockJob *job) 496751ebd76SFam Zheng { 4972f0c9fe6SPaolo Bonzini if (job->co && !job->busy) { 4980b8b8753SPaolo Bonzini qemu_coroutine_enter(job->co); 4992f0c9fe6SPaolo Bonzini } 5002f0c9fe6SPaolo Bonzini } 5012f0c9fe6SPaolo Bonzini 5028acc72a4SPaolo Bonzini void block_job_cancel(BlockJob *job) 5038acc72a4SPaolo Bonzini { 5045ccac6f1SJohn Snow if (block_job_started(job)) { 5058acc72a4SPaolo Bonzini job->cancelled = true; 50617bd51f9SStefan Hajnoczi block_job_iostatus_reset(job); 507751ebd76SFam Zheng block_job_enter(job); 5085ccac6f1SJohn Snow } else { 5095ccac6f1SJohn Snow block_job_completed(job, -ECANCELED); 5105ccac6f1SJohn Snow } 5118acc72a4SPaolo Bonzini } 5128acc72a4SPaolo Bonzini 5132f0c9fe6SPaolo Bonzini bool block_job_is_cancelled(BlockJob *job) 5142f0c9fe6SPaolo Bonzini { 5152f0c9fe6SPaolo Bonzini return job->cancelled; 5162f0c9fe6SPaolo Bonzini } 5172f0c9fe6SPaolo Bonzini 51832c81a4aSPaolo Bonzini void block_job_iostatus_reset(BlockJob *job) 51932c81a4aSPaolo Bonzini { 52032c81a4aSPaolo Bonzini job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; 5213fc4b10aSFam Zheng if (job->driver->iostatus_reset) { 5223fc4b10aSFam Zheng job->driver->iostatus_reset(job); 5233bd293c3SPaolo Bonzini } 52432c81a4aSPaolo Bonzini } 52532c81a4aSPaolo Bonzini 526345f9e1bSMax Reitz static int block_job_finish_sync(BlockJob *job, 527345f9e1bSMax Reitz void (*finish)(BlockJob *, Error **errp), 528345f9e1bSMax Reitz Error **errp) 5292f0c9fe6SPaolo Bonzini { 530345f9e1bSMax Reitz Error *local_err = NULL; 53194db6d2dSFam Zheng int ret; 5322f0c9fe6SPaolo Bonzini 533b6d2e599SKevin Wolf assert(blk_bs(job->blk)->job == job); 5342f0c9fe6SPaolo Bonzini 53594db6d2dSFam Zheng block_job_ref(job); 536bae8196dSPaolo Bonzini 537345f9e1bSMax Reitz finish(job, &local_err); 538345f9e1bSMax Reitz if (local_err) { 539345f9e1bSMax Reitz error_propagate(errp, local_err); 54094db6d2dSFam Zheng block_job_unref(job); 541345f9e1bSMax Reitz return -EBUSY; 542345f9e1bSMax Reitz } 543bae8196dSPaolo Bonzini /* block_job_drain calls block_job_enter, and it should be enough to 544bae8196dSPaolo Bonzini * induce progress until the job completes or moves to the main thread. 545bae8196dSPaolo Bonzini */ 546bae8196dSPaolo Bonzini while (!job->deferred_to_main_loop && !job->completed) { 547bae8196dSPaolo Bonzini block_job_drain(job); 548bae8196dSPaolo Bonzini } 54994db6d2dSFam Zheng while (!job->completed) { 550bae8196dSPaolo Bonzini aio_poll(qemu_get_aio_context(), true); 5512f0c9fe6SPaolo Bonzini } 55294db6d2dSFam Zheng ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret; 55394db6d2dSFam Zheng block_job_unref(job); 55494db6d2dSFam Zheng return ret; 5552f0c9fe6SPaolo Bonzini } 5562f0c9fe6SPaolo Bonzini 557345f9e1bSMax Reitz /* A wrapper around block_job_cancel() taking an Error ** parameter so it may be 558345f9e1bSMax Reitz * used with block_job_finish_sync() without the need for (rather nasty) 559345f9e1bSMax Reitz * function pointer casts there. */ 560345f9e1bSMax Reitz static void block_job_cancel_err(BlockJob *job, Error **errp) 561345f9e1bSMax Reitz { 562345f9e1bSMax Reitz block_job_cancel(job); 563345f9e1bSMax Reitz } 564345f9e1bSMax Reitz 565345f9e1bSMax Reitz int block_job_cancel_sync(BlockJob *job) 566345f9e1bSMax Reitz { 567345f9e1bSMax Reitz return block_job_finish_sync(job, &block_job_cancel_err, NULL); 568345f9e1bSMax Reitz } 569345f9e1bSMax Reitz 570a1a2af07SKevin Wolf void block_job_cancel_sync_all(void) 571a1a2af07SKevin Wolf { 572a1a2af07SKevin Wolf BlockJob *job; 573a1a2af07SKevin Wolf AioContext *aio_context; 574a1a2af07SKevin Wolf 575a1a2af07SKevin Wolf while ((job = QLIST_FIRST(&block_jobs))) { 576b6d2e599SKevin Wolf aio_context = blk_get_aio_context(job->blk); 577a1a2af07SKevin Wolf aio_context_acquire(aio_context); 578a1a2af07SKevin Wolf block_job_cancel_sync(job); 579a1a2af07SKevin Wolf aio_context_release(aio_context); 580a1a2af07SKevin Wolf } 581a1a2af07SKevin Wolf } 582a1a2af07SKevin Wolf 583345f9e1bSMax Reitz int block_job_complete_sync(BlockJob *job, Error **errp) 584345f9e1bSMax Reitz { 585345f9e1bSMax Reitz return block_job_finish_sync(job, &block_job_complete, errp); 586345f9e1bSMax Reitz } 587345f9e1bSMax Reitz 5887483d1e5SAlex Bligh void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns) 5892f0c9fe6SPaolo Bonzini { 5908acc72a4SPaolo Bonzini assert(job->busy); 5918acc72a4SPaolo Bonzini 5922f0c9fe6SPaolo Bonzini /* Check cancellation *before* setting busy = false, too! */ 5938acc72a4SPaolo Bonzini if (block_job_is_cancelled(job)) { 5948acc72a4SPaolo Bonzini return; 5952f0c9fe6SPaolo Bonzini } 5968acc72a4SPaolo Bonzini 5978acc72a4SPaolo Bonzini job->busy = false; 598a7f3b7ffSStefan Hajnoczi if (!block_job_should_pause(job)) { 5990824afdaSAlberto Garcia co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns); 6000824afdaSAlberto Garcia } 6018acc72a4SPaolo Bonzini job->busy = true; 602fc9c0a9cSStefan Hajnoczi 603fc9c0a9cSStefan Hajnoczi block_job_pause_point(job); 6042f0c9fe6SPaolo Bonzini } 60530e628b7SPaolo Bonzini 606dc71ce45SFam Zheng void block_job_yield(BlockJob *job) 607dc71ce45SFam Zheng { 608dc71ce45SFam Zheng assert(job->busy); 609dc71ce45SFam Zheng 610dc71ce45SFam Zheng /* Check cancellation *before* setting busy = false, too! */ 611dc71ce45SFam Zheng if (block_job_is_cancelled(job)) { 612dc71ce45SFam Zheng return; 613dc71ce45SFam Zheng } 614dc71ce45SFam Zheng 615dc71ce45SFam Zheng job->busy = false; 616fc9c0a9cSStefan Hajnoczi if (!block_job_should_pause(job)) { 617dc71ce45SFam Zheng qemu_coroutine_yield(); 618fc9c0a9cSStefan Hajnoczi } 619dc71ce45SFam Zheng job->busy = true; 620fc9c0a9cSStefan Hajnoczi 621fc9c0a9cSStefan Hajnoczi block_job_pause_point(job); 622dc71ce45SFam Zheng } 623dc71ce45SFam Zheng 624559b935fSJohn Snow BlockJobInfo *block_job_query(BlockJob *job, Error **errp) 62530e628b7SPaolo Bonzini { 626559b935fSJohn Snow BlockJobInfo *info; 627559b935fSJohn Snow 628559b935fSJohn Snow if (block_job_is_internal(job)) { 629559b935fSJohn Snow error_setg(errp, "Cannot query QEMU internal jobs"); 630559b935fSJohn Snow return NULL; 631559b935fSJohn Snow } 632559b935fSJohn Snow info = g_new0(BlockJobInfo, 1); 63379e14bf7SFam Zheng info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]); 6348ccb9569SKevin Wolf info->device = g_strdup(job->id); 63530e628b7SPaolo Bonzini info->len = job->len; 6368d65883fSPaolo Bonzini info->busy = job->busy; 637751ebd76SFam Zheng info->paused = job->pause_count > 0; 63830e628b7SPaolo Bonzini info->offset = job->offset; 63930e628b7SPaolo Bonzini info->speed = job->speed; 64032c81a4aSPaolo Bonzini info->io_status = job->iostatus; 641ef6dbf1eSMax Reitz info->ready = job->ready; 64230e628b7SPaolo Bonzini return info; 64330e628b7SPaolo Bonzini } 64432c81a4aSPaolo Bonzini 64532c81a4aSPaolo Bonzini static void block_job_iostatus_set_err(BlockJob *job, int error) 64632c81a4aSPaolo Bonzini { 64732c81a4aSPaolo Bonzini if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { 64832c81a4aSPaolo Bonzini job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : 64932c81a4aSPaolo Bonzini BLOCK_DEVICE_IO_STATUS_FAILED; 65032c81a4aSPaolo Bonzini } 65132c81a4aSPaolo Bonzini } 65232c81a4aSPaolo Bonzini 6538254b6d9SJohn Snow static void block_job_event_cancelled(BlockJob *job) 654a66a2a36SPaolo Bonzini { 655559b935fSJohn Snow if (block_job_is_internal(job)) { 656559b935fSJohn Snow return; 657559b935fSJohn Snow } 658559b935fSJohn Snow 659bcada37bSWenchao Xia qapi_event_send_block_job_cancelled(job->driver->job_type, 6608ccb9569SKevin Wolf job->id, 661a66a2a36SPaolo Bonzini job->len, 662a66a2a36SPaolo Bonzini job->offset, 663bcada37bSWenchao Xia job->speed, 664bcada37bSWenchao Xia &error_abort); 665a66a2a36SPaolo Bonzini } 666a66a2a36SPaolo Bonzini 6678254b6d9SJohn Snow static void block_job_event_completed(BlockJob *job, const char *msg) 668a66a2a36SPaolo Bonzini { 669559b935fSJohn Snow if (block_job_is_internal(job)) { 670559b935fSJohn Snow return; 671559b935fSJohn Snow } 672559b935fSJohn Snow 673bcada37bSWenchao Xia qapi_event_send_block_job_completed(job->driver->job_type, 6748ccb9569SKevin Wolf job->id, 675bcada37bSWenchao Xia job->len, 676bcada37bSWenchao Xia job->offset, 677bcada37bSWenchao Xia job->speed, 678bcada37bSWenchao Xia !!msg, 679bcada37bSWenchao Xia msg, 680bcada37bSWenchao Xia &error_abort); 681bcada37bSWenchao Xia } 682bcada37bSWenchao Xia 683bcada37bSWenchao Xia void block_job_event_ready(BlockJob *job) 684bcada37bSWenchao Xia { 685ef6dbf1eSMax Reitz job->ready = true; 686ef6dbf1eSMax Reitz 687559b935fSJohn Snow if (block_job_is_internal(job)) { 688559b935fSJohn Snow return; 689559b935fSJohn Snow } 690559b935fSJohn Snow 691518848a2SMarkus Armbruster qapi_event_send_block_job_ready(job->driver->job_type, 6928ccb9569SKevin Wolf job->id, 693518848a2SMarkus Armbruster job->len, 694518848a2SMarkus Armbruster job->offset, 695518848a2SMarkus Armbruster job->speed, &error_abort); 696a66a2a36SPaolo Bonzini } 697a66a2a36SPaolo Bonzini 69881e254dcSKevin Wolf BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err, 69932c81a4aSPaolo Bonzini int is_read, int error) 70032c81a4aSPaolo Bonzini { 70132c81a4aSPaolo Bonzini BlockErrorAction action; 70232c81a4aSPaolo Bonzini 70332c81a4aSPaolo Bonzini switch (on_err) { 70432c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_ENOSPC: 7058c398252SKevin Wolf case BLOCKDEV_ON_ERROR_AUTO: 706a589569fSWenchao Xia action = (error == ENOSPC) ? 707a589569fSWenchao Xia BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; 70832c81a4aSPaolo Bonzini break; 70932c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_STOP: 710a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_STOP; 71132c81a4aSPaolo Bonzini break; 71232c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_REPORT: 713a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_REPORT; 71432c81a4aSPaolo Bonzini break; 71532c81a4aSPaolo Bonzini case BLOCKDEV_ON_ERROR_IGNORE: 716a589569fSWenchao Xia action = BLOCK_ERROR_ACTION_IGNORE; 71732c81a4aSPaolo Bonzini break; 71832c81a4aSPaolo Bonzini default: 71932c81a4aSPaolo Bonzini abort(); 72032c81a4aSPaolo Bonzini } 721559b935fSJohn Snow if (!block_job_is_internal(job)) { 7228ccb9569SKevin Wolf qapi_event_send_block_job_error(job->id, 7235a2d2cbdSWenchao Xia is_read ? IO_OPERATION_TYPE_READ : 7245a2d2cbdSWenchao Xia IO_OPERATION_TYPE_WRITE, 7255a2d2cbdSWenchao Xia action, &error_abort); 726559b935fSJohn Snow } 727a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_STOP) { 728751ebd76SFam Zheng /* make the pause user visible, which will be resumed from QMP. */ 7290df4ba58SJohn Snow block_job_user_pause(job); 73032c81a4aSPaolo Bonzini block_job_iostatus_set_err(job, error); 73132c81a4aSPaolo Bonzini } 73232c81a4aSPaolo Bonzini return action; 73332c81a4aSPaolo Bonzini } 734dec7d421SStefan Hajnoczi 735dec7d421SStefan Hajnoczi typedef struct { 736dec7d421SStefan Hajnoczi BlockJob *job; 737dec7d421SStefan Hajnoczi AioContext *aio_context; 738dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopFn *fn; 739dec7d421SStefan Hajnoczi void *opaque; 740dec7d421SStefan Hajnoczi } BlockJobDeferToMainLoopData; 741dec7d421SStefan Hajnoczi 742dec7d421SStefan Hajnoczi static void block_job_defer_to_main_loop_bh(void *opaque) 743dec7d421SStefan Hajnoczi { 744dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopData *data = opaque; 745dec7d421SStefan Hajnoczi AioContext *aio_context; 746dec7d421SStefan Hajnoczi 747dec7d421SStefan Hajnoczi /* Prevent race with block_job_defer_to_main_loop() */ 748dec7d421SStefan Hajnoczi aio_context_acquire(data->aio_context); 749dec7d421SStefan Hajnoczi 750dec7d421SStefan Hajnoczi /* Fetch BDS AioContext again, in case it has changed */ 751b6d2e599SKevin Wolf aio_context = blk_get_aio_context(data->job->blk); 752dec7d421SStefan Hajnoczi aio_context_acquire(aio_context); 753dec7d421SStefan Hajnoczi 754794f0141SFam Zheng data->job->deferred_to_main_loop = false; 755dec7d421SStefan Hajnoczi data->fn(data->job, data->opaque); 756dec7d421SStefan Hajnoczi 757dec7d421SStefan Hajnoczi aio_context_release(aio_context); 758dec7d421SStefan Hajnoczi 759dec7d421SStefan Hajnoczi aio_context_release(data->aio_context); 760dec7d421SStefan Hajnoczi 761dec7d421SStefan Hajnoczi g_free(data); 762dec7d421SStefan Hajnoczi } 763dec7d421SStefan Hajnoczi 764dec7d421SStefan Hajnoczi void block_job_defer_to_main_loop(BlockJob *job, 765dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopFn *fn, 766dec7d421SStefan Hajnoczi void *opaque) 767dec7d421SStefan Hajnoczi { 768dec7d421SStefan Hajnoczi BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data)); 769dec7d421SStefan Hajnoczi data->job = job; 770b6d2e599SKevin Wolf data->aio_context = blk_get_aio_context(job->blk); 771dec7d421SStefan Hajnoczi data->fn = fn; 772dec7d421SStefan Hajnoczi data->opaque = opaque; 773794f0141SFam Zheng job->deferred_to_main_loop = true; 774dec7d421SStefan Hajnoczi 775fffb6e12SPaolo Bonzini aio_bh_schedule_oneshot(qemu_get_aio_context(), 776fffb6e12SPaolo Bonzini block_job_defer_to_main_loop_bh, data); 777dec7d421SStefan Hajnoczi } 778c55a832fSFam Zheng 779c55a832fSFam Zheng BlockJobTxn *block_job_txn_new(void) 780c55a832fSFam Zheng { 781c55a832fSFam Zheng BlockJobTxn *txn = g_new0(BlockJobTxn, 1); 782c55a832fSFam Zheng QLIST_INIT(&txn->jobs); 783c55a832fSFam Zheng txn->refcnt = 1; 784c55a832fSFam Zheng return txn; 785c55a832fSFam Zheng } 786c55a832fSFam Zheng 787c55a832fSFam Zheng static void block_job_txn_ref(BlockJobTxn *txn) 788c55a832fSFam Zheng { 789c55a832fSFam Zheng txn->refcnt++; 790c55a832fSFam Zheng } 791c55a832fSFam Zheng 792c55a832fSFam Zheng void block_job_txn_unref(BlockJobTxn *txn) 793c55a832fSFam Zheng { 794c55a832fSFam Zheng if (txn && --txn->refcnt == 0) { 795c55a832fSFam Zheng g_free(txn); 796c55a832fSFam Zheng } 797c55a832fSFam Zheng } 798c55a832fSFam Zheng 799c55a832fSFam Zheng void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job) 800c55a832fSFam Zheng { 801c55a832fSFam Zheng if (!txn) { 802c55a832fSFam Zheng return; 803c55a832fSFam Zheng } 804c55a832fSFam Zheng 805c55a832fSFam Zheng assert(!job->txn); 806c55a832fSFam Zheng job->txn = txn; 807c55a832fSFam Zheng 808c55a832fSFam Zheng QLIST_INSERT_HEAD(&txn->jobs, job, txn_list); 809c55a832fSFam Zheng block_job_txn_ref(txn); 810c55a832fSFam Zheng } 811