Re: [Qemu-devel] [PATCH v3 15/15] tests: add BlockJobTxn unit test

[John Snow <jsnow@redhat.com>]

On 07/09/2015 11:46 PM, Fam Zheng wrote:
> From: Stefan Hajnoczi <stefanha@redhat.com>
> 
> The BlockJobTxn unit test verifies that both single jobs and pairs of
> jobs behave as a transaction group.  Either all jobs complete
> successfully or the group is cancelled.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  tests/Makefile            |   3 +
>  tests/test-blockjob-txn.c | 228 ++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 231 insertions(+)
>  create mode 100644 tests/test-blockjob-txn.c
> 
> diff --git a/tests/Makefile b/tests/Makefile
> index 2cd1195..da79721 100644
> --- a/tests/Makefile
> +++ b/tests/Makefile
> @@ -45,6 +45,8 @@ check-unit-y += tests/test-thread-pool$(EXESUF)
>  gcov-files-test-thread-pool-y = thread-pool.c
>  gcov-files-test-hbitmap-y = util/hbitmap.c
>  check-unit-y += tests/test-hbitmap$(EXESUF)
> +gcov-files-test-hbitmap-y = blockjob.c
> +check-unit-y += tests/test-blockjob-txn$(EXESUF)
>  check-unit-y += tests/test-x86-cpuid$(EXESUF)
>  # all code tested by test-x86-cpuid is inside topology.h
>  gcov-files-test-x86-cpuid-y =
> @@ -286,6 +288,7 @@ tests/test-coroutine$(EXESUF): tests/test-coroutine.o $(block-obj-y) libqemuutil
>  tests/test-aio$(EXESUF): tests/test-aio.o $(block-obj-y) libqemuutil.a libqemustub.a
>  tests/test-rfifolock$(EXESUF): tests/test-rfifolock.o libqemuutil.a libqemustub.a
>  tests/test-throttle$(EXESUF): tests/test-throttle.o $(block-obj-y) libqemuutil.a libqemustub.a
> +tests/test-blockjob-txn$(EXESUF): tests/test-blockjob-txn.o $(block-obj-y) libqemuutil.a libqemustub.a
>  tests/test-thread-pool$(EXESUF): tests/test-thread-pool.o $(block-obj-y) libqemuutil.a libqemustub.a
>  tests/test-iov$(EXESUF): tests/test-iov.o libqemuutil.a
>  tests/test-hbitmap$(EXESUF): tests/test-hbitmap.o libqemuutil.a libqemustub.a
> diff --git a/tests/test-blockjob-txn.c b/tests/test-blockjob-txn.c
> new file mode 100644
> index 0000000..62a7510
> --- /dev/null
> +++ b/tests/test-blockjob-txn.c
> @@ -0,0 +1,228 @@
> +/*
> + * Blockjob transactions tests
> + *
> + * Copyright Red Hat, Inc. 2015
> + *
> + * Authors:
> + *  Stefan Hajnoczi    <stefanha@redhat.com>
> + *
> + * This work is licensed under the terms of the GNU LGPL, version 2 or later.
> + * See the COPYING.LIB file in the top-level directory.
> + */
> +
> +#include <glib.h>
> +#include "qapi/error.h"
> +#include "qemu/main-loop.h"
> +#include "block/blockjob.h"
> +
> +typedef struct {
> +    BlockJob common;
> +    unsigned int iterations;
> +    bool use_timer;
> +    int rc;
> +} TestBlockJob;
> +
> +static const BlockJobDriver test_block_job_driver = {
> +    .instance_size = sizeof(TestBlockJob),
> +};
> +
> +static void test_block_job_complete(BlockJob *job, void *opaque)
> +{
> +    BlockDriverState *bs = job->bs;
> +    int rc = (intptr_t)opaque;
> +
> +    if (block_job_is_cancelled(job)) {
> +        rc = -ECANCELED;
> +    }
> +
> +    block_job_completed(job, rc);
> +    bdrv_unref(bs);
> +}
> +
> +static void coroutine_fn test_block_job_run(void *opaque)
> +{
> +    TestBlockJob *s = opaque;
> +    BlockJob *job = &s->common;
> +
> +    while (s->iterations--) {
> +        if (s->use_timer) {
> +            block_job_sleep_ns(job, QEMU_CLOCK_REALTIME, 0);
> +        } else {
> +            block_job_yield(job);
> +        }
> +
> +        if (block_job_is_cancelled(job)) {
> +            break;
> +        }
> +    }
> +
> +    block_job_defer_to_main_loop(job, test_block_job_complete,
> +                                 (void *)(intptr_t)s->rc);
> +}
> +
> +static void test_block_job_cb(void *opaque, int ret)
> +{
> +    *(int *)opaque = ret;
> +}
> +
> +/* Create a block job that completes with a given return code after a given
> + * number of event loop iterations.  The return code is stored in the given
> + * result pointer.
> + *
> + * The event loop iterations can either be handled automatically with a 0 delay
> + * timer, or they can be stepped manually by entering the coroutine.
> + */
> +static BlockJob *test_block_job_start(unsigned int iterations,
> +                                      bool use_timer,
> +                                      int rc, int *result)
> +{
> +    BlockDriverState *bs;
> +    TestBlockJob *s;
> +
> +    bs = bdrv_new();
> +    s = block_job_create(&test_block_job_driver, bs, 0, test_block_job_cb,
> +                         result, &error_abort);
> +    s->iterations = iterations;
> +    s->use_timer = use_timer;
> +    s->rc = rc;
> +    s->common.co = qemu_coroutine_create(test_block_job_run);
> +    qemu_coroutine_enter(s->common.co, s);
> +    return &s->common;
> +}
> +
> +static void test_single_job(int expected)
> +{
> +    BlockJob *job;
> +    BlockJobTxn *txn;
> +    int result = -EINPROGRESS;
> +
> +    txn = block_job_txn_new();
> +    job = test_block_job_start(1, true, expected, &result);
> +    block_job_txn_add_job(txn, job);
> +
> +    if (expected == -ECANCELED) {
> +        block_job_cancel(job);
> +    }
> +
> +    while (result == -EINPROGRESS) {
> +        aio_poll(qemu_get_aio_context(), true);
> +    }
> +    g_assert_cmpint(result, ==, expected);
> +}
> +
> +static void test_single_job_success(void)
> +{
> +    test_single_job(0);
> +}
> +
> +static void test_single_job_failure(void)
> +{
> +    test_single_job(-EIO);
> +}
> +
> +static void test_single_job_cancel(void)
> +{
> +    test_single_job(-ECANCELED);
> +}
> +
> +static void test_pair_jobs(int expected1, int expected2)
> +{
> +    BlockJob *job1;
> +    BlockJob *job2;
> +    BlockJobTxn *txn;
> +    int result1 = -EINPROGRESS;
> +    int result2 = -EINPROGRESS;
> +
> +    txn = block_job_txn_new();
> +    job1 = test_block_job_start(1, true, expected1, &result1);
> +    block_job_txn_add_job(txn, job1);
> +    job2 = test_block_job_start(2, true, expected2, &result2);
> +    block_job_txn_add_job(txn, job2);
> +
> +    if (expected1 == -ECANCELED) {
> +        block_job_cancel(job1);
> +    }
> +    if (expected2 == -ECANCELED) {
> +        block_job_cancel(job2);
> +    }
> +
> +    while (result1 == -EINPROGRESS || result2 == -EINPROGRESS) {
> +        aio_poll(qemu_get_aio_context(), true);
> +    }
> +
> +    /* Failure or cancellation of one job cancels the other job */
> +    if (expected1 != 0) {
> +        expected2 = -ECANCELED;
> +    } else if (expected2 != 0) {
> +        expected1 = -ECANCELED;
> +    }
> +
> +    g_assert_cmpint(result1, ==, expected1);
> +    g_assert_cmpint(result2, ==, expected2);
> +}
> +
> +static void test_pair_jobs_success(void)
> +{
> +    test_pair_jobs(0, 0);
> +}
> +
> +static void test_pair_jobs_failure(void)
> +{
> +    /* Test both orderings.  The two jobs run for a different number of
> +     * iterations so the code path is different depending on which job fails
> +     * first.
> +     */
> +    test_pair_jobs(-EIO, 0);
> +    test_pair_jobs(0, -EIO);
> +}
> +
> +static void test_pair_jobs_cancel(void)
> +{
> +    test_pair_jobs(-ECANCELED, 0);
> +    test_pair_jobs(0, -ECANCELED);
> +}
> +
> +static void test_pair_jobs_fail_cancel_race(void)
> +{
> +    BlockJob *job1;
> +    BlockJob *job2;
> +    BlockJobTxn *txn;
> +    int result1 = -EINPROGRESS;
> +    int result2 = -EINPROGRESS;
> +
> +    txn = block_job_txn_new();
> +    job1 = test_block_job_start(1, true, -ECANCELED, &result1);
> +    block_job_txn_add_job(txn, job1);
> +    job2 = test_block_job_start(2, false, 0, &result2);
> +    block_job_txn_add_job(txn, job2);
> +
> +    block_job_cancel(job1);
> +
> +    /* Now make job2 finish before the main loop kicks jobs.  This means
> +     * simulates the race between a pending kick and another job completing.
> +     */
> +    block_job_enter(job2);
> +    block_job_enter(job2);
> +
> +    while (result1 == -EINPROGRESS || result2 == -EINPROGRESS) {
> +        aio_poll(qemu_get_aio_context(), true);
> +    }
> +
> +    g_assert_cmpint(result1, ==, -ECANCELED);
> +    g_assert_cmpint(result2, ==, -ECANCELED);
> +}
> +
> +int main(int argc, char **argv)
> +{
> +    qemu_init_main_loop(&error_abort);
> +
> +    g_test_init(&argc, &argv, NULL);
> +    g_test_add_func("/single/success", test_single_job_success);
> +    g_test_add_func("/single/failure", test_single_job_failure);
> +    g_test_add_func("/single/cancel", test_single_job_cancel);
> +    g_test_add_func("/pair/success", test_pair_jobs_success);
> +    g_test_add_func("/pair/failure", test_pair_jobs_failure);
> +    g_test_add_func("/pair/cancel", test_pair_jobs_cancel);
> +    g_test_add_func("/pair/fail-cancel-race", test_pair_jobs_fail_cancel_race);
> +    return g_test_run();
> +}
> 

Reviewed-by: John Snow <jsnow@redhat.com>