tests/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 <glib.h>
  15 #include "qemu/main-loop.h"
  16 #include "block/blockjob.h"
  17
  18 typedef struct {
  19     BlockJob common;
  20     unsigned int iterations;
  21     bool use_timer;
  22     int rc;
  23     int *result;
  24 } TestBlockJob;
  25
  26 static const BlockJobDriver test_block_job_driver = {
  27     .instance_size = sizeof(TestBlockJob),
  28 };
  29
  30 static void test_block_job_complete(BlockJob *job, void *opaque)
  31 {
  32     BlockDriverState *bs = job->bs;
  33     int rc = (intptr_t)opaque;
  34
  35     if (block_job_is_cancelled(job)) {
  36         rc = -ECANCELED;
  37     }
  38
  39     block_job_completed(job, rc);
  40     bdrv_unref(bs);
  41 }
  42
  43 static void coroutine_fn test_block_job_run(void *opaque)
  44 {
  45     TestBlockJob *s = opaque;
  46     BlockJob *job = &s->common;
  47
  48     while (s->iterations--) {
  49         if (s->use_timer) {
  50             block_job_sleep_ns(job, QEMU_CLOCK_REALTIME, 0);
  51         } else {
  52             block_job_yield(job);
  53         }
  54
  55         if (block_job_is_cancelled(job)) {
  56             break;
  57         }
  58     }
  59
  60     block_job_defer_to_main_loop(job, test_block_job_complete,
  61                                  (void *)(intptr_t)s->rc);
  62 }
  63
  64 typedef struct {
  65     TestBlockJob *job;
  66     int *result;
  67 } TestBlockJobCBData;
  68
  69 static void test_block_job_cb(void *opaque, int ret)
  70 {
  71     TestBlockJobCBData *data = opaque;
  72     if (!ret && block_job_is_cancelled(&data->job->common)) {
  73         ret = -ECANCELED;
  74     }
  75     *data->result = ret;
  76     g_free(data);
  77 }
  78
  79 /* Create a block job that completes with a given return code after a given
  80  * number of event loop iterations.  The return code is stored in the given
  81  * result pointer.
  82  *
  83  * The event loop iterations can either be handled automatically with a 0 delay
  84  * timer, or they can be stepped manually by entering the coroutine.
  85  */
  86 static BlockJob *test_block_job_start(unsigned int iterations,
  87                                       bool use_timer,
  88                                       int rc, int *result)
  89 {
  90     BlockDriverState *bs;
  91     TestBlockJob *s;
  92     TestBlockJobCBData *data;
  93
  94     data = g_new0(TestBlockJobCBData, 1);
  95     bs = bdrv_new();
  96     s = block_job_create(&test_block_job_driver, bs, 0, test_block_job_cb,
  97                          data, &error_abort);
  98     s->iterations = iterations;
  99     s->use_timer = use_timer;
 100     s->rc = rc;
 101     s->result = result;
 102     s->common.co = qemu_coroutine_create(test_block_job_run);
 103     data->job = s;
 104     data->result = result;
 105     qemu_coroutine_enter(s->common.co, s);
 106     return &s->common;
 107 }
 108
 109 static void test_single_job(int expected)
 110 {
 111     BlockJob *job;
 112     BlockJobTxn *txn;
 113     int result = -EINPROGRESS;
 114
 115     txn = block_job_txn_new();
 116     job = test_block_job_start(1, true, expected, &result);
 117     block_job_txn_add_job(txn, job);
 118
 119     if (expected == -ECANCELED) {
 120         block_job_cancel(job);
 121     }
 122
 123     while (result == -EINPROGRESS) {
 124         aio_poll(qemu_get_aio_context(), true);
 125     }
 126     g_assert_cmpint(result, ==, expected);
 127
 128     block_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     BlockJobTxn *txn;
 151     int result1 = -EINPROGRESS;
 152     int result2 = -EINPROGRESS;
 153
 154     txn = block_job_txn_new();
 155     job1 = test_block_job_start(1, true, expected1, &result1);
 156     block_job_txn_add_job(txn, job1);
 157     job2 = test_block_job_start(2, true, expected2, &result2);
 158     block_job_txn_add_job(txn, job2);
 159
 160     if (expected1 == -ECANCELED) {
 161         block_job_cancel(job1);
 162     }
 163     if (expected2 == -ECANCELED) {
 164         block_job_cancel(job2);
 165     }
 166
 167     while (result1 == -EINPROGRESS || result2 == -EINPROGRESS) {
 168         aio_poll(qemu_get_aio_context(), true);
 169     }
 170
 171     /* Failure or cancellation of one job cancels the other job */
 172     if (expected1 != 0) {
 173         expected2 = -ECANCELED;
 174     } else if (expected2 != 0) {
 175         expected1 = -ECANCELED;
 176     }
 177
 178     g_assert_cmpint(result1, ==, expected1);
 179     g_assert_cmpint(result2, ==, expected2);
 180
 181     block_job_txn_unref(txn);
 182 }
 183
 184 static void test_pair_jobs_success(void)
 185 {
 186     test_pair_jobs(0, 0);
 187 }
 188
 189 static void test_pair_jobs_failure(void)
 190 {
 191     /* Test both orderings.  The two jobs run for a different number of
 192      * iterations so the code path is different depending on which job fails
 193      * first.
 194      */
 195     test_pair_jobs(-EIO, 0);
 196     test_pair_jobs(0, -EIO);
 197 }
 198
 199 static void test_pair_jobs_cancel(void)
 200 {
 201     test_pair_jobs(-ECANCELED, 0);
 202     test_pair_jobs(0, -ECANCELED);
 203 }
 204
 205 static void test_pair_jobs_fail_cancel_race(void)
 206 {
 207     BlockJob *job1;
 208     BlockJob *job2;
 209     BlockJobTxn *txn;
 210     int result1 = -EINPROGRESS;
 211     int result2 = -EINPROGRESS;
 212
 213     txn = block_job_txn_new();
 214     job1 = test_block_job_start(1, true, -ECANCELED, &result1);
 215     block_job_txn_add_job(txn, job1);
 216     job2 = test_block_job_start(2, false, 0, &result2);
 217     block_job_txn_add_job(txn, job2);
 218
 219     block_job_cancel(job1);
 220
 221     /* Now make job2 finish before the main loop kicks jobs.  This simulates
 222      * the race between a pending kick and another job completing.
 223      */
 224     block_job_enter(job2);
 225     block_job_enter(job2);
 226
 227     while (result1 == -EINPROGRESS || result2 == -EINPROGRESS) {
 228         aio_poll(qemu_get_aio_context(), true);
 229     }
 230
 231     g_assert_cmpint(result1, ==, -ECANCELED);
 232     g_assert_cmpint(result2, ==, -ECANCELED);
 233
 234     block_job_txn_unref(txn);
 235 }
 236
 237 int main(int argc, char **argv)
 238 {
 239     qemu_init_main_loop(&error_abort);
 240
 241     g_test_init(&argc, &argv, NULL);
 242     g_test_add_func("/single/success", test_single_job_success);
 243     g_test_add_func("/single/failure", test_single_job_failure);
 244     g_test_add_func("/single/cancel", test_single_job_cancel);
 245     g_test_add_func("/pair/success", test_pair_jobs_success);
 246     g_test_add_func("/pair/failure", test_pair_jobs_failure);
 247     g_test_add_func("/pair/cancel", test_pair_jobs_cancel);
 248     g_test_add_func("/pair/fail-cancel-race", test_pair_jobs_fail_cancel_race);
 249     return g_test_run();
 250 }