tests/unit/test-block-iothread.c

   1 /*
   2  * Block tests for iothreads
   3  *
   4  * Copyright (c) 2018 Kevin Wolf <kwolf@redhat.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "block/block.h"
  27 #include "block/blockjob_int.h"
  28 #include "sysemu/block-backend.h"
  29 #include "qapi/error.h"
  30 #include "qapi/qmp/qdict.h"
  31 #include "qemu/main-loop.h"
  32 #include "iothread.h"
  33
  34 static int coroutine_fn bdrv_test_co_prwv(BlockDriverState *bs,
  35                                           uint64_t offset, uint64_t bytes,
  36                                           QEMUIOVector *qiov, int flags)
  37 {
  38     return 0;
  39 }
  40
  41 static int coroutine_fn bdrv_test_co_pdiscard(BlockDriverState *bs,
  42                                               int64_t offset, int bytes)
  43 {
  44     return 0;
  45 }
  46
  47 static int coroutine_fn
  48 bdrv_test_co_truncate(BlockDriverState *bs, int64_t offset, bool exact,
  49                       PreallocMode prealloc, BdrvRequestFlags flags,
  50                       Error **errp)
  51 {
  52     return 0;
  53 }
  54
  55 static int coroutine_fn bdrv_test_co_block_status(BlockDriverState *bs,
  56                                                   bool want_zero,
  57                                                   int64_t offset, int64_t count,
  58                                                   int64_t *pnum, int64_t *map,
  59                                                   BlockDriverState **file)
  60 {
  61     *pnum = count;
  62     return 0;
  63 }
  64
  65 static BlockDriver bdrv_test = {
  66     .format_name            = "test",
  67     .instance_size          = 1,
  68
  69     .bdrv_co_preadv         = bdrv_test_co_prwv,
  70     .bdrv_co_pwritev        = bdrv_test_co_prwv,
  71     .bdrv_co_pdiscard       = bdrv_test_co_pdiscard,
  72     .bdrv_co_truncate       = bdrv_test_co_truncate,
  73     .bdrv_co_block_status   = bdrv_test_co_block_status,
  74 };
  75
  76 static void test_sync_op_pread(BdrvChild *c)
  77 {
  78     uint8_t buf[512];
  79     int ret;
  80
  81     /* Success */
  82     ret = bdrv_pread(c, 0, buf, sizeof(buf));
  83     g_assert_cmpint(ret, ==, 512);
  84
  85     /* Early error: Negative offset */
  86     ret = bdrv_pread(c, -2, buf, sizeof(buf));
  87     g_assert_cmpint(ret, ==, -EIO);
  88 }
  89
  90 static void test_sync_op_pwrite(BdrvChild *c)
  91 {
  92     uint8_t buf[512] = { 0 };
  93     int ret;
  94
  95     /* Success */
  96     ret = bdrv_pwrite(c, 0, buf, sizeof(buf));
  97     g_assert_cmpint(ret, ==, 512);
  98
  99     /* Early error: Negative offset */
 100     ret = bdrv_pwrite(c, -2, buf, sizeof(buf));
 101     g_assert_cmpint(ret, ==, -EIO);
 102 }
 103
 104 static void test_sync_op_blk_pread(BlockBackend *blk)
 105 {
 106     uint8_t buf[512];
 107     int ret;
 108
 109     /* Success */
 110     ret = blk_pread(blk, 0, buf, sizeof(buf));
 111     g_assert_cmpint(ret, ==, 512);
 112
 113     /* Early error: Negative offset */
 114     ret = blk_pread(blk, -2, buf, sizeof(buf));
 115     g_assert_cmpint(ret, ==, -EIO);
 116 }
 117
 118 static void test_sync_op_blk_pwrite(BlockBackend *blk)
 119 {
 120     uint8_t buf[512] = { 0 };
 121     int ret;
 122
 123     /* Success */
 124     ret = blk_pwrite(blk, 0, buf, sizeof(buf), 0);
 125     g_assert_cmpint(ret, ==, 512);
 126
 127     /* Early error: Negative offset */
 128     ret = blk_pwrite(blk, -2, buf, sizeof(buf), 0);
 129     g_assert_cmpint(ret, ==, -EIO);
 130 }
 131
 132 static void test_sync_op_load_vmstate(BdrvChild *c)
 133 {
 134     uint8_t buf[512];
 135     int ret;
 136
 137     /* Error: Driver does not support snapshots */
 138     ret = bdrv_load_vmstate(c->bs, buf, 0, sizeof(buf));
 139     g_assert_cmpint(ret, ==, -ENOTSUP);
 140 }
 141
 142 static void test_sync_op_save_vmstate(BdrvChild *c)
 143 {
 144     uint8_t buf[512] = { 0 };
 145     int ret;
 146
 147     /* Error: Driver does not support snapshots */
 148     ret = bdrv_save_vmstate(c->bs, buf, 0, sizeof(buf));
 149     g_assert_cmpint(ret, ==, -ENOTSUP);
 150 }
 151
 152 static void test_sync_op_pdiscard(BdrvChild *c)
 153 {
 154     int ret;
 155
 156     /* Normal success path */
 157     c->bs->open_flags |= BDRV_O_UNMAP;
 158     ret = bdrv_pdiscard(c, 0, 512);
 159     g_assert_cmpint(ret, ==, 0);
 160
 161     /* Early success: UNMAP not supported */
 162     c->bs->open_flags &= ~BDRV_O_UNMAP;
 163     ret = bdrv_pdiscard(c, 0, 512);
 164     g_assert_cmpint(ret, ==, 0);
 165
 166     /* Early error: Negative offset */
 167     ret = bdrv_pdiscard(c, -2, 512);
 168     g_assert_cmpint(ret, ==, -EIO);
 169 }
 170
 171 static void test_sync_op_blk_pdiscard(BlockBackend *blk)
 172 {
 173     int ret;
 174
 175     /* Early success: UNMAP not supported */
 176     ret = blk_pdiscard(blk, 0, 512);
 177     g_assert_cmpint(ret, ==, 0);
 178
 179     /* Early error: Negative offset */
 180     ret = blk_pdiscard(blk, -2, 512);
 181     g_assert_cmpint(ret, ==, -EIO);
 182 }
 183
 184 static void test_sync_op_truncate(BdrvChild *c)
 185 {
 186     int ret;
 187
 188     /* Normal success path */
 189     ret = bdrv_truncate(c, 65536, false, PREALLOC_MODE_OFF, 0, NULL);
 190     g_assert_cmpint(ret, ==, 0);
 191
 192     /* Early error: Negative offset */
 193     ret = bdrv_truncate(c, -2, false, PREALLOC_MODE_OFF, 0, NULL);
 194     g_assert_cmpint(ret, ==, -EINVAL);
 195
 196     /* Error: Read-only image */
 197     c->bs->open_flags &= ~BDRV_O_RDWR;
 198
 199     ret = bdrv_truncate(c, 65536, false, PREALLOC_MODE_OFF, 0, NULL);
 200     g_assert_cmpint(ret, ==, -EACCES);
 201
 202     c->bs->open_flags |= BDRV_O_RDWR;
 203 }
 204
 205 static void test_sync_op_block_status(BdrvChild *c)
 206 {
 207     int ret;
 208     int64_t n;
 209
 210     /* Normal success path */
 211     ret = bdrv_is_allocated(c->bs, 0, 65536, &n);
 212     g_assert_cmpint(ret, ==, 0);
 213
 214     /* Early success: No driver support */
 215     bdrv_test.bdrv_co_block_status = NULL;
 216     ret = bdrv_is_allocated(c->bs, 0, 65536, &n);
 217     g_assert_cmpint(ret, ==, 1);
 218
 219     /* Early success: bytes = 0 */
 220     ret = bdrv_is_allocated(c->bs, 0, 0, &n);
 221     g_assert_cmpint(ret, ==, 0);
 222
 223     /* Early success: Offset > image size*/
 224     ret = bdrv_is_allocated(c->bs, 0x1000000, 0x1000000, &n);
 225     g_assert_cmpint(ret, ==, 0);
 226 }
 227
 228 static void test_sync_op_flush(BdrvChild *c)
 229 {
 230     int ret;
 231
 232     /* Normal success path */
 233     ret = bdrv_flush(c->bs);
 234     g_assert_cmpint(ret, ==, 0);
 235
 236     /* Early success: Read-only image */
 237     c->bs->open_flags &= ~BDRV_O_RDWR;
 238
 239     ret = bdrv_flush(c->bs);
 240     g_assert_cmpint(ret, ==, 0);
 241
 242     c->bs->open_flags |= BDRV_O_RDWR;
 243 }
 244
 245 static void test_sync_op_blk_flush(BlockBackend *blk)
 246 {
 247     BlockDriverState *bs = blk_bs(blk);
 248     int ret;
 249
 250     /* Normal success path */
 251     ret = blk_flush(blk);
 252     g_assert_cmpint(ret, ==, 0);
 253
 254     /* Early success: Read-only image */
 255     bs->open_flags &= ~BDRV_O_RDWR;
 256
 257     ret = blk_flush(blk);
 258     g_assert_cmpint(ret, ==, 0);
 259
 260     bs->open_flags |= BDRV_O_RDWR;
 261 }
 262
 263 static void test_sync_op_check(BdrvChild *c)
 264 {
 265     BdrvCheckResult result;
 266     int ret;
 267
 268     /* Error: Driver does not implement check */
 269     ret = bdrv_check(c->bs, &result, 0);
 270     g_assert_cmpint(ret, ==, -ENOTSUP);
 271 }
 272
 273 static void test_sync_op_invalidate_cache(BdrvChild *c)
 274 {
 275     /* Early success: Image is not inactive */
 276     bdrv_invalidate_cache(c->bs, NULL);
 277 }
 278
 279
 280 typedef struct SyncOpTest {
 281     const char *name;
 282     void (*fn)(BdrvChild *c);
 283     void (*blkfn)(BlockBackend *blk);
 284 } SyncOpTest;
 285
 286 const SyncOpTest sync_op_tests[] = {
 287     {
 288         .name   = "/sync-op/pread",
 289         .fn     = test_sync_op_pread,
 290         .blkfn  = test_sync_op_blk_pread,
 291     }, {
 292         .name   = "/sync-op/pwrite",
 293         .fn     = test_sync_op_pwrite,
 294         .blkfn  = test_sync_op_blk_pwrite,
 295     }, {
 296         .name   = "/sync-op/load_vmstate",
 297         .fn     = test_sync_op_load_vmstate,
 298     }, {
 299         .name   = "/sync-op/save_vmstate",
 300         .fn     = test_sync_op_save_vmstate,
 301     }, {
 302         .name   = "/sync-op/pdiscard",
 303         .fn     = test_sync_op_pdiscard,
 304         .blkfn  = test_sync_op_blk_pdiscard,
 305     }, {
 306         .name   = "/sync-op/truncate",
 307         .fn     = test_sync_op_truncate,
 308     }, {
 309         .name   = "/sync-op/block_status",
 310         .fn     = test_sync_op_block_status,
 311     }, {
 312         .name   = "/sync-op/flush",
 313         .fn     = test_sync_op_flush,
 314         .blkfn  = test_sync_op_blk_flush,
 315     }, {
 316         .name   = "/sync-op/check",
 317         .fn     = test_sync_op_check,
 318     }, {
 319         .name   = "/sync-op/invalidate_cache",
 320         .fn     = test_sync_op_invalidate_cache,
 321     },
 322 };
 323
 324 /* Test synchronous operations that run in a different iothread, so we have to
 325  * poll for the coroutine there to return. */
 326 static void test_sync_op(const void *opaque)
 327 {
 328     const SyncOpTest *t = opaque;
 329     IOThread *iothread = iothread_new();
 330     AioContext *ctx = iothread_get_aio_context(iothread);
 331     BlockBackend *blk;
 332     BlockDriverState *bs;
 333     BdrvChild *c;
 334
 335     blk = blk_new(qemu_get_aio_context(), BLK_PERM_ALL, BLK_PERM_ALL);
 336     bs = bdrv_new_open_driver(&bdrv_test, "base", BDRV_O_RDWR, &error_abort);
 337     bs->total_sectors = 65536 / BDRV_SECTOR_SIZE;
 338     blk_insert_bs(blk, bs, &error_abort);
 339     c = QLIST_FIRST(&bs->parents);
 340
 341     blk_set_aio_context(blk, ctx, &error_abort);
 342     aio_context_acquire(ctx);
 343     t->fn(c);
 344     if (t->blkfn) {
 345         t->blkfn(blk);
 346     }
 347     blk_set_aio_context(blk, qemu_get_aio_context(), &error_abort);
 348     aio_context_release(ctx);
 349
 350     bdrv_unref(bs);
 351     blk_unref(blk);
 352 }
 353
 354 typedef struct TestBlockJob {
 355     BlockJob common;
 356     bool should_complete;
 357     int n;
 358 } TestBlockJob;
 359
 360 static int test_job_prepare(Job *job)
 361 {
 362     g_assert(qemu_get_current_aio_context() == qemu_get_aio_context());
 363     return 0;
 364 }
 365
 366 static int coroutine_fn test_job_run(Job *job, Error **errp)
 367 {
 368     TestBlockJob *s = container_of(job, TestBlockJob, common.job);
 369
 370     job_transition_to_ready(&s->common.job);
 371     while (!s->should_complete) {
 372         s->n++;
 373         g_assert(qemu_get_current_aio_context() == job->aio_context);
 374
 375         /* Avoid job_sleep_ns() because it marks the job as !busy. We want to
 376          * emulate some actual activity (probably some I/O) here so that the
 377          * drain involved in AioContext switches has to wait for this activity
 378          * to stop. */
 379         qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 1000000);
 380
 381         job_pause_point(&s->common.job);
 382     }
 383
 384     g_assert(qemu_get_current_aio_context() == job->aio_context);
 385     return 0;
 386 }
 387
 388 static void test_job_complete(Job *job, Error **errp)
 389 {
 390     TestBlockJob *s = container_of(job, TestBlockJob, common.job);
 391     s->should_complete = true;
 392 }
 393
 394 BlockJobDriver test_job_driver = {
 395     .job_driver = {
 396         .instance_size  = sizeof(TestBlockJob),
 397         .free           = block_job_free,
 398         .user_resume    = block_job_user_resume,
 399         .run            = test_job_run,
 400         .complete       = test_job_complete,
 401         .prepare        = test_job_prepare,
 402     },
 403 };
 404
 405 static void test_attach_blockjob(void)
 406 {
 407     IOThread *iothread = iothread_new();
 408     AioContext *ctx = iothread_get_aio_context(iothread);
 409     BlockBackend *blk;
 410     BlockDriverState *bs;
 411     TestBlockJob *tjob;
 412
 413     blk = blk_new(qemu_get_aio_context(), BLK_PERM_ALL, BLK_PERM_ALL);
 414     bs = bdrv_new_open_driver(&bdrv_test, "base", BDRV_O_RDWR, &error_abort);
 415     blk_insert_bs(blk, bs, &error_abort);
 416
 417     tjob = block_job_create("job0", &test_job_driver, NULL, bs,
 418                             0, BLK_PERM_ALL,
 419                             0, 0, NULL, NULL, &error_abort);
 420     job_start(&tjob->common.job);
 421
 422     while (tjob->n == 0) {
 423         aio_poll(qemu_get_aio_context(), false);
 424     }
 425
 426     blk_set_aio_context(blk, ctx, &error_abort);
 427
 428     tjob->n = 0;
 429     while (tjob->n == 0) {
 430         aio_poll(qemu_get_aio_context(), false);
 431     }
 432
 433     aio_context_acquire(ctx);
 434     blk_set_aio_context(blk, qemu_get_aio_context(), &error_abort);
 435     aio_context_release(ctx);
 436
 437     tjob->n = 0;
 438     while (tjob->n == 0) {
 439         aio_poll(qemu_get_aio_context(), false);
 440     }
 441
 442     blk_set_aio_context(blk, ctx, &error_abort);
 443
 444     tjob->n = 0;
 445     while (tjob->n == 0) {
 446         aio_poll(qemu_get_aio_context(), false);
 447     }
 448
 449     aio_context_acquire(ctx);
 450     job_complete_sync(&tjob->common.job, &error_abort);
 451     blk_set_aio_context(blk, qemu_get_aio_context(), &error_abort);
 452     aio_context_release(ctx);
 453
 454     bdrv_unref(bs);
 455     blk_unref(blk);
 456 }
 457
 458 /*
 459  * Test that changing the AioContext for one node in a tree (here through blk)
 460  * changes all other nodes as well:
 461  *
 462  *  blk
 463  *   |
 464  *   |  bs_verify [blkverify]
 465  *   |   /               \
 466  *   |  /                 \
 467  *  bs_a [bdrv_test]    bs_b [bdrv_test]
 468  *
 469  */
 470 static void test_propagate_basic(void)
 471 {
 472     IOThread *iothread = iothread_new();
 473     AioContext *ctx = iothread_get_aio_context(iothread);
 474     AioContext *main_ctx;
 475     BlockBackend *blk;
 476     BlockDriverState *bs_a, *bs_b, *bs_verify;
 477     QDict *options;
 478
 479     /*
 480      * Create bs_a and its BlockBackend.  We cannot take the RESIZE
 481      * permission because blkverify will not share it on the test
 482      * image.
 483      */
 484     blk = blk_new(qemu_get_aio_context(), BLK_PERM_ALL & ~BLK_PERM_RESIZE,
 485                   BLK_PERM_ALL);
 486     bs_a = bdrv_new_open_driver(&bdrv_test, "bs_a", BDRV_O_RDWR, &error_abort);
 487     blk_insert_bs(blk, bs_a, &error_abort);
 488
 489     /* Create bs_b */
 490     bs_b = bdrv_new_open_driver(&bdrv_test, "bs_b", BDRV_O_RDWR, &error_abort);
 491
 492     /* Create blkverify filter that references both bs_a and bs_b */
 493     options = qdict_new();
 494     qdict_put_str(options, "driver", "blkverify");
 495     qdict_put_str(options, "test", "bs_a");
 496     qdict_put_str(options, "raw", "bs_b");
 497
 498     bs_verify = bdrv_open(NULL, NULL, options, BDRV_O_RDWR, &error_abort);
 499
 500     /* Switch the AioContext */
 501     blk_set_aio_context(blk, ctx, &error_abort);
 502     g_assert(blk_get_aio_context(blk) == ctx);
 503     g_assert(bdrv_get_aio_context(bs_a) == ctx);
 504     g_assert(bdrv_get_aio_context(bs_verify) == ctx);
 505     g_assert(bdrv_get_aio_context(bs_b) == ctx);
 506
 507     /* Switch the AioContext back */
 508     main_ctx = qemu_get_aio_context();
 509     aio_context_acquire(ctx);
 510     blk_set_aio_context(blk, main_ctx, &error_abort);
 511     aio_context_release(ctx);
 512     g_assert(blk_get_aio_context(blk) == main_ctx);
 513     g_assert(bdrv_get_aio_context(bs_a) == main_ctx);
 514     g_assert(bdrv_get_aio_context(bs_verify) == main_ctx);
 515     g_assert(bdrv_get_aio_context(bs_b) == main_ctx);
 516
 517     bdrv_unref(bs_verify);
 518     bdrv_unref(bs_b);
 519     bdrv_unref(bs_a);
 520     blk_unref(blk);
 521 }
 522
 523 /*
 524  * Test that diamonds in the graph don't lead to endless recursion:
 525  *
 526  *              blk
 527  *               |
 528  *      bs_verify [blkverify]
 529  *       /              \
 530  *      /                \
 531  *   bs_b [raw]         bs_c[raw]
 532  *      \                /
 533  *       \              /
 534  *       bs_a [bdrv_test]
 535  */
 536 static void test_propagate_diamond(void)
 537 {
 538     IOThread *iothread = iothread_new();
 539     AioContext *ctx = iothread_get_aio_context(iothread);
 540     AioContext *main_ctx;
 541     BlockBackend *blk;
 542     BlockDriverState *bs_a, *bs_b, *bs_c, *bs_verify;
 543     QDict *options;
 544
 545     /* Create bs_a */
 546     bs_a = bdrv_new_open_driver(&bdrv_test, "bs_a", BDRV_O_RDWR, &error_abort);
 547
 548     /* Create bs_b and bc_c */
 549     options = qdict_new();
 550     qdict_put_str(options, "driver", "raw");
 551     qdict_put_str(options, "file", "bs_a");
 552     qdict_put_str(options, "node-name", "bs_b");
 553     bs_b = bdrv_open(NULL, NULL, options, BDRV_O_RDWR, &error_abort);
 554
 555     options = qdict_new();
 556     qdict_put_str(options, "driver", "raw");
 557     qdict_put_str(options, "file", "bs_a");
 558     qdict_put_str(options, "node-name", "bs_c");
 559     bs_c = bdrv_open(NULL, NULL, options, BDRV_O_RDWR, &error_abort);
 560
 561     /* Create blkverify filter that references both bs_b and bs_c */
 562     options = qdict_new();
 563     qdict_put_str(options, "driver", "blkverify");
 564     qdict_put_str(options, "test", "bs_b");
 565     qdict_put_str(options, "raw", "bs_c");
 566
 567     bs_verify = bdrv_open(NULL, NULL, options, BDRV_O_RDWR, &error_abort);
 568     /*
 569      * Do not take the RESIZE permission: This would require the same
 570      * from bs_c and thus from bs_a; however, blkverify will not share
 571      * it on bs_b, and thus it will not be available for bs_a.
 572      */
 573     blk = blk_new(qemu_get_aio_context(), BLK_PERM_ALL & ~BLK_PERM_RESIZE,
 574                   BLK_PERM_ALL);
 575     blk_insert_bs(blk, bs_verify, &error_abort);
 576
 577     /* Switch the AioContext */
 578     blk_set_aio_context(blk, ctx, &error_abort);
 579     g_assert(blk_get_aio_context(blk) == ctx);
 580     g_assert(bdrv_get_aio_context(bs_verify) == ctx);
 581     g_assert(bdrv_get_aio_context(bs_a) == ctx);
 582     g_assert(bdrv_get_aio_context(bs_b) == ctx);
 583     g_assert(bdrv_get_aio_context(bs_c) == ctx);
 584
 585     /* Switch the AioContext back */
 586     main_ctx = qemu_get_aio_context();
 587     aio_context_acquire(ctx);
 588     blk_set_aio_context(blk, main_ctx, &error_abort);
 589     aio_context_release(ctx);
 590     g_assert(blk_get_aio_context(blk) == main_ctx);
 591     g_assert(bdrv_get_aio_context(bs_verify) == main_ctx);
 592     g_assert(bdrv_get_aio_context(bs_a) == main_ctx);
 593     g_assert(bdrv_get_aio_context(bs_b) == main_ctx);
 594     g_assert(bdrv_get_aio_context(bs_c) == main_ctx);
 595
 596     blk_unref(blk);
 597     bdrv_unref(bs_verify);
 598     bdrv_unref(bs_c);
 599     bdrv_unref(bs_b);
 600     bdrv_unref(bs_a);
 601 }
 602
 603 static void test_propagate_mirror(void)
 604 {
 605     IOThread *iothread = iothread_new();
 606     AioContext *ctx = iothread_get_aio_context(iothread);
 607     AioContext *main_ctx = qemu_get_aio_context();
 608     BlockDriverState *src, *target, *filter;
 609     BlockBackend *blk;
 610     Job *job;
 611     Error *local_err = NULL;
 612
 613     /* Create src and target*/
 614     src = bdrv_new_open_driver(&bdrv_test, "src", BDRV_O_RDWR, &error_abort);
 615     target = bdrv_new_open_driver(&bdrv_test, "target", BDRV_O_RDWR,
 616                                   &error_abort);
 617
 618     /* Start a mirror job */
 619     mirror_start("job0", src, target, NULL, JOB_DEFAULT, 0, 0, 0,
 620                  MIRROR_SYNC_MODE_NONE, MIRROR_OPEN_BACKING_CHAIN, false,
 621                  BLOCKDEV_ON_ERROR_REPORT, BLOCKDEV_ON_ERROR_REPORT,
 622                  false, "filter_node", MIRROR_COPY_MODE_BACKGROUND,
 623                  &error_abort);
 624     job = job_get("job0");
 625     filter = bdrv_find_node("filter_node");
 626
 627     /* Change the AioContext of src */
 628     bdrv_try_set_aio_context(src, ctx, &error_abort);
 629     g_assert(bdrv_get_aio_context(src) == ctx);
 630     g_assert(bdrv_get_aio_context(target) == ctx);
 631     g_assert(bdrv_get_aio_context(filter) == ctx);
 632     g_assert(job->aio_context == ctx);
 633
 634     /* Change the AioContext of target */
 635     aio_context_acquire(ctx);
 636     bdrv_try_set_aio_context(target, main_ctx, &error_abort);
 637     aio_context_release(ctx);
 638     g_assert(bdrv_get_aio_context(src) == main_ctx);
 639     g_assert(bdrv_get_aio_context(target) == main_ctx);
 640     g_assert(bdrv_get_aio_context(filter) == main_ctx);
 641
 642     /* With a BlockBackend on src, changing target must fail */
 643     blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
 644     blk_insert_bs(blk, src, &error_abort);
 645
 646     bdrv_try_set_aio_context(target, ctx, &local_err);
 647     error_free_or_abort(&local_err);
 648
 649     g_assert(blk_get_aio_context(blk) == main_ctx);
 650     g_assert(bdrv_get_aio_context(src) == main_ctx);
 651     g_assert(bdrv_get_aio_context(target) == main_ctx);
 652     g_assert(bdrv_get_aio_context(filter) == main_ctx);
 653
 654     /* ...unless we explicitly allow it */
 655     aio_context_acquire(ctx);
 656     blk_set_allow_aio_context_change(blk, true);
 657     bdrv_try_set_aio_context(target, ctx, &error_abort);
 658     aio_context_release(ctx);
 659
 660     g_assert(blk_get_aio_context(blk) == ctx);
 661     g_assert(bdrv_get_aio_context(src) == ctx);
 662     g_assert(bdrv_get_aio_context(target) == ctx);
 663     g_assert(bdrv_get_aio_context(filter) == ctx);
 664
 665     job_cancel_sync_all();
 666
 667     aio_context_acquire(ctx);
 668     blk_set_aio_context(blk, main_ctx, &error_abort);
 669     bdrv_try_set_aio_context(target, main_ctx, &error_abort);
 670     aio_context_release(ctx);
 671
 672     blk_unref(blk);
 673     bdrv_unref(src);
 674     bdrv_unref(target);
 675 }
 676
 677 static void test_attach_second_node(void)
 678 {
 679     IOThread *iothread = iothread_new();
 680     AioContext *ctx = iothread_get_aio_context(iothread);
 681     AioContext *main_ctx = qemu_get_aio_context();
 682     BlockBackend *blk;
 683     BlockDriverState *bs, *filter;
 684     QDict *options;
 685
 686     blk = blk_new(ctx, BLK_PERM_ALL, BLK_PERM_ALL);
 687     bs = bdrv_new_open_driver(&bdrv_test, "base", BDRV_O_RDWR, &error_abort);
 688     blk_insert_bs(blk, bs, &error_abort);
 689
 690     options = qdict_new();
 691     qdict_put_str(options, "driver", "raw");
 692     qdict_put_str(options, "file", "base");
 693
 694     filter = bdrv_open(NULL, NULL, options, BDRV_O_RDWR, &error_abort);
 695     g_assert(blk_get_aio_context(blk) == ctx);
 696     g_assert(bdrv_get_aio_context(bs) == ctx);
 697     g_assert(bdrv_get_aio_context(filter) == ctx);
 698
 699     aio_context_acquire(ctx);
 700     blk_set_aio_context(blk, main_ctx, &error_abort);
 701     aio_context_release(ctx);
 702     g_assert(blk_get_aio_context(blk) == main_ctx);
 703     g_assert(bdrv_get_aio_context(bs) == main_ctx);
 704     g_assert(bdrv_get_aio_context(filter) == main_ctx);
 705
 706     bdrv_unref(filter);
 707     bdrv_unref(bs);
 708     blk_unref(blk);
 709 }
 710
 711 static void test_attach_preserve_blk_ctx(void)
 712 {
 713     IOThread *iothread = iothread_new();
 714     AioContext *ctx = iothread_get_aio_context(iothread);
 715     BlockBackend *blk;
 716     BlockDriverState *bs;
 717
 718     blk = blk_new(ctx, BLK_PERM_ALL, BLK_PERM_ALL);
 719     bs = bdrv_new_open_driver(&bdrv_test, "base", BDRV_O_RDWR, &error_abort);
 720     bs->total_sectors = 65536 / BDRV_SECTOR_SIZE;
 721
 722     /* Add node to BlockBackend that has an iothread context assigned */
 723     blk_insert_bs(blk, bs, &error_abort);
 724     g_assert(blk_get_aio_context(blk) == ctx);
 725     g_assert(bdrv_get_aio_context(bs) == ctx);
 726
 727     /* Remove the node again */
 728     aio_context_acquire(ctx);
 729     blk_remove_bs(blk);
 730     aio_context_release(ctx);
 731     g_assert(blk_get_aio_context(blk) == ctx);
 732     g_assert(bdrv_get_aio_context(bs) == qemu_get_aio_context());
 733
 734     /* Re-attach the node */
 735     blk_insert_bs(blk, bs, &error_abort);
 736     g_assert(blk_get_aio_context(blk) == ctx);
 737     g_assert(bdrv_get_aio_context(bs) == ctx);
 738
 739     aio_context_acquire(ctx);
 740     blk_set_aio_context(blk, qemu_get_aio_context(), &error_abort);
 741     aio_context_release(ctx);
 742     bdrv_unref(bs);
 743     blk_unref(blk);
 744 }
 745
 746 int main(int argc, char **argv)
 747 {
 748     int i;
 749
 750     bdrv_init();
 751     qemu_init_main_loop(&error_abort);
 752
 753     g_test_init(&argc, &argv, NULL);
 754
 755     for (i = 0; i < ARRAY_SIZE(sync_op_tests); i++) {
 756         const SyncOpTest *t = &sync_op_tests[i];
 757         g_test_add_data_func(t->name, t, test_sync_op);
 758     }
 759
 760     g_test_add_func("/attach/blockjob", test_attach_blockjob);
 761     g_test_add_func("/attach/second_node", test_attach_second_node);
 762     g_test_add_func("/attach/preserve_blk_ctx", test_attach_preserve_blk_ctx);
 763     g_test_add_func("/propagate/basic", test_propagate_basic);
 764     g_test_add_func("/propagate/diamond", test_propagate_diamond);
 765     g_test_add_func("/propagate/mirror", test_propagate_mirror);
 766
 767     return g_test_run();
 768 }