tests/unit/test-blockjob-txn.c

   1 /*
   2  * Blockjob transactions tests
   3  *
   4  * Copyright Red Hat, Inc. 2015
   5  *
   6  * Authors:
   7  *  Stefan Hajnoczi    <stefanha@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU LGPL, version 2 or later.
  10  * See the COPYING.LIB file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "qapi/error.h"
  15 #include "qemu/main-loop.h"
  16 #include "block/blockjob_int.h"
  17 #include "sysemu/block-backend.h"
  18 #include "qapi/qmp/qdict.h"
  19
  20 typedef struct {
  21     BlockJob common;
  22     unsigned int iterations;
  23     bool use_timer;
  24     int rc;
  25     int *result;
  26 } TestBlockJob;
  27
  28 static int coroutine_fn test_block_job_run(Job *job, Error **errp)
  29 {
  30     TestBlockJob *s = container_of(job, TestBlockJob, common.job);
  31
  32     while (s->iterations--) {
  33         if (s->use_timer) {
  34             job_sleep_ns(job, 0);
  35         } else {
  36             job_yield(job);
  37         }
  38
  39         if (job_is_cancelled(job)) {
  40             break;
  41         }
  42     }
  43
  44     return s->rc;
  45 }
  46
  47 typedef struct {
  48     TestBlockJob *job;
  49     int *result;
  50 } TestBlockJobCBData;
  51
  52 static void test_block_job_cb(void *opaque, int ret)
  53 {
  54     TestBlockJobCBData *data = opaque;
  55     if (!ret && job_is_cancelled(&data->job->common.job)) {
  56         ret = -ECANCELED;
  57     }
  58     *data->result = ret;
  59     g_free(data);
  60 }
  61
  62 static const BlockJobDriver test_block_job_driver = {
  63     .job_driver = {
  64         .instance_size = sizeof(TestBlockJob),
  65         .free          = block_job_free,
  66         .user_resume   = block_job_user_resume,
  67         .run           = test_block_job_run,
  68     },
  69 };
  70
  71 /* Create a block job that completes with a given return code after a given
  72  * number of event loop iterations.  The return code is stored in the given
  73  * result pointer.
  74  *
  75  * The event loop iterations can either be handled automatically with a 0 delay
  76  * timer, or they can be stepped manually by entering the coroutine.
  77  */
  78 static BlockJob *test_block_job_start(unsigned int iterations,
  79                                       bool use_timer,
  80                                       int rc, int *result, JobTxn *txn)
  81 {
  82     BlockDriverState *bs;
  83     TestBlockJob *s;
  84     TestBlockJobCBData *data;
  85     static unsigned counter;
  86     char job_id[24];
  87
  88     data = g_new0(TestBlockJobCBData, 1);
  89
  90     QDict *opt = qdict_new();
  91     qdict_put_str(opt, "file.read-zeroes", "on");
  92     bs = bdrv_open("null-co://", NULL, opt, 0, &error_abort);
  93     g_assert_nonnull(bs);
  94
  95     snprintf(job_id, sizeof(job_id), "job%u", counter++);
  96     s = block_job_create(job_id, &test_block_job_driver, txn, bs,
  97                          0, BLK_PERM_ALL, 0, JOB_DEFAULT,
  98                          test_block_job_cb, data, &error_abort);
  99     bdrv_unref(bs); /* referenced by job now */
 100     s->iterations = iterations;
 101     s->use_timer = use_timer;
 102     s->rc = rc;
 103     s->result = result;
 104     data->job = s;
 105     data->result = result;
 106     return &s->common;
 107 }
 108
 109 static void test_single_job(int expected)
 110 {
 111     BlockJob *job;
 112     JobTxn *txn;
 113     int result = -EINPROGRESS;
 114
 115     txn = job_txn_new();
 116     job = test_block_job_start(1, true, expected, &result, txn);
 117     job_start(&job->job);
 118
 119     if (expected == -ECANCELED) {
 120         job_cancel(&job->job, false);
 121     }
 122
 123     while (result == -EINPROGRESS) {
 124         aio_poll(qemu_get_aio_context(), true);
 125     }
 126     g_assert_cmpint(result, ==, expected);
 127
 128     job_txn_unref(txn);
 129 }
 130
 131 static void test_single_job_success(void)
 132 {
 133     test_single_job(0);
 134 }
 135
 136 static void test_single_job_failure(void)
 137 {
 138     test_single_job(-EIO);
 139 }
 140
 141 static void test_single_job_cancel(void)
 142 {
 143     test_single_job(-ECANCELED);
 144 }
 145
 146 static void test_pair_jobs(int expected1, int expected2)
 147 {
 148     BlockJob *job1;
 149     BlockJob *job2;
 150     JobTxn *txn;
 151     int result1 = -EINPROGRESS;
 152     int result2 = -EINPROGRESS;
 153
 154     txn = job_txn_new();
 155     job1 = test_block_job_start(1, true, expected1, &result1, txn);
 156     job2 = test_block_job_start(2, true, expected2, &result2, txn);
 157     job_start(&job1->job);
 158     job_start(&job2->job);
 159
 160     /* Release our reference now to trigger as many nice
 161      * use-after-free bugs as possible.
 162      */
 163     job_txn_unref(txn);
 164
 165     if (expected1 == -ECANCELED) {
 166         job_cancel(&job1->job, false);
 167     }
 168     if (expected2 == -ECANCELED) {
 169         job_cancel(&job2->job, false);
 170     }
 171
 172     while (result1 == -EINPROGRESS || result2 == -EINPROGRESS) {
 173         aio_poll(qemu_get_aio_context(), true);
 174     }
 175
 176     /* Failure or cancellation of one job cancels the other job */
 177     if (expected1 != 0) {
 178         expected2 = -ECANCELED;
 179     } else if (expected2 != 0) {
 180         expected1 = -ECANCELED;
 181     }
 182
 183     g_assert_cmpint(result1, ==, expected1);
 184     g_assert_cmpint(result2, ==, expected2);
 185 }
 186
 187 static void test_pair_jobs_success(void)
 188 {
 189     test_pair_jobs(0, 0);
 190 }
 191
 192 static void test_pair_jobs_failure(void)
 193 {
 194     /* Test both orderings.  The two jobs run for a different number of
 195      * iterations so the code path is different depending on which job fails
 196      * first.
 197      */
 198     test_pair_jobs(-EIO, 0);
 199     test_pair_jobs(0, -EIO);
 200 }
 201
 202 static void test_pair_jobs_cancel(void)
 203 {
 204     test_pair_jobs(-ECANCELED, 0);
 205     test_pair_jobs(0, -ECANCELED);
 206 }
 207
 208 static void test_pair_jobs_fail_cancel_race(void)
 209 {
 210     BlockJob *job1;
 211     BlockJob *job2;
 212     JobTxn *txn;
 213     int result1 = -EINPROGRESS;
 214     int result2 = -EINPROGRESS;
 215
 216     txn = job_txn_new();
 217     job1 = test_block_job_start(1, true, -ECANCELED, &result1, txn);
 218     job2 = test_block_job_start(2, false, 0, &result2, txn);
 219     job_start(&job1->job);
 220     job_start(&job2->job);
 221
 222     job_cancel(&job1->job, false);
 223
 224     /* Now make job2 finish before the main loop kicks jobs.  This simulates
 225      * the race between a pending kick and another job completing.
 226      */
 227     job_enter(&job2->job);
 228     job_enter(&job2->job);
 229
 230     while (result1 == -EINPROGRESS || result2 == -EINPROGRESS) {
 231         aio_poll(qemu_get_aio_context(), true);
 232     }
 233
 234     g_assert_cmpint(result1, ==, -ECANCELED);
 235     g_assert_cmpint(result2, ==, -ECANCELED);
 236
 237     job_txn_unref(txn);
 238 }
 239
 240 int main(int argc, char **argv)
 241 {
 242     qemu_init_main_loop(&error_abort);
 243     bdrv_init();
 244
 245     g_test_init(&argc, &argv, NULL);
 246     g_test_add_func("/single/success", test_single_job_success);
 247     g_test_add_func("/single/failure", test_single_job_failure);
 248     g_test_add_func("/single/cancel", test_single_job_cancel);
 249     g_test_add_func("/pair/success", test_pair_jobs_success);
 250     g_test_add_func("/pair/failure", test_pair_jobs_failure);
 251     g_test_add_func("/pair/cancel", test_pair_jobs_cancel);
 252     g_test_add_func("/pair/fail-cancel-race", test_pair_jobs_fail_cancel_race);
 253     return g_test_run();
 254 }