To make it a little more obvious which functions are intended to be public interface and which are intended to be for use only by jobs themselves, split the interface into "public" and "private" files. Convert blockjobs (e.g. block/backup) to using the private interface. Leave blockdev and others on the public interface. There are remaining uses of private state by qemu-img, and several cases in blockdev.c and block/io.c where we grab job->blk for the purposes of acquiring an AIOContext. These will be corrected in future patches. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Message-id: 1477584421-1399-7-git-send-email-jsnow@redhat.com Signed-off-by: Jeff Cody <jcody@redhat.com>
256 lines
6.5 KiB
C
256 lines
6.5 KiB
C
/*
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* Blockjob transactions tests
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*
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* Copyright Red Hat, Inc. 2015
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/main-loop.h"
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#include "block/blockjob_int.h"
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#include "sysemu/block-backend.h"
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typedef struct {
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BlockJob common;
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unsigned int iterations;
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bool use_timer;
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int rc;
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int *result;
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} TestBlockJob;
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static const BlockJobDriver test_block_job_driver = {
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.instance_size = sizeof(TestBlockJob),
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};
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static void test_block_job_complete(BlockJob *job, void *opaque)
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{
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BlockDriverState *bs = blk_bs(job->blk);
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int rc = (intptr_t)opaque;
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if (block_job_is_cancelled(job)) {
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rc = -ECANCELED;
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}
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block_job_completed(job, rc);
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bdrv_unref(bs);
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}
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static void coroutine_fn test_block_job_run(void *opaque)
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{
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TestBlockJob *s = opaque;
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BlockJob *job = &s->common;
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while (s->iterations--) {
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if (s->use_timer) {
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block_job_sleep_ns(job, QEMU_CLOCK_REALTIME, 0);
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} else {
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block_job_yield(job);
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}
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if (block_job_is_cancelled(job)) {
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break;
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}
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}
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block_job_defer_to_main_loop(job, test_block_job_complete,
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(void *)(intptr_t)s->rc);
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}
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typedef struct {
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TestBlockJob *job;
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int *result;
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} TestBlockJobCBData;
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static void test_block_job_cb(void *opaque, int ret)
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{
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TestBlockJobCBData *data = opaque;
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if (!ret && block_job_is_cancelled(&data->job->common)) {
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ret = -ECANCELED;
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}
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*data->result = ret;
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g_free(data);
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}
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/* Create a block job that completes with a given return code after a given
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* number of event loop iterations. The return code is stored in the given
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* result pointer.
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*
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* The event loop iterations can either be handled automatically with a 0 delay
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* timer, or they can be stepped manually by entering the coroutine.
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*/
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static BlockJob *test_block_job_start(unsigned int iterations,
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bool use_timer,
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int rc, int *result)
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{
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BlockDriverState *bs;
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TestBlockJob *s;
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TestBlockJobCBData *data;
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static unsigned counter;
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char job_id[24];
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data = g_new0(TestBlockJobCBData, 1);
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bs = bdrv_new();
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snprintf(job_id, sizeof(job_id), "job%u", counter++);
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s = block_job_create(job_id, &test_block_job_driver, bs, 0,
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BLOCK_JOB_DEFAULT, test_block_job_cb,
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data, &error_abort);
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s->iterations = iterations;
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s->use_timer = use_timer;
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s->rc = rc;
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s->result = result;
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s->common.co = qemu_coroutine_create(test_block_job_run, s);
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data->job = s;
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data->result = result;
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qemu_coroutine_enter(s->common.co);
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return &s->common;
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}
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static void test_single_job(int expected)
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{
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BlockJob *job;
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BlockJobTxn *txn;
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int result = -EINPROGRESS;
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txn = block_job_txn_new();
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job = test_block_job_start(1, true, expected, &result);
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block_job_txn_add_job(txn, job);
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if (expected == -ECANCELED) {
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block_job_cancel(job);
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}
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while (result == -EINPROGRESS) {
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aio_poll(qemu_get_aio_context(), true);
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}
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g_assert_cmpint(result, ==, expected);
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block_job_txn_unref(txn);
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}
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static void test_single_job_success(void)
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{
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test_single_job(0);
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}
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static void test_single_job_failure(void)
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{
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test_single_job(-EIO);
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}
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static void test_single_job_cancel(void)
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{
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test_single_job(-ECANCELED);
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}
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static void test_pair_jobs(int expected1, int expected2)
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{
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BlockJob *job1;
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BlockJob *job2;
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BlockJobTxn *txn;
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int result1 = -EINPROGRESS;
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int result2 = -EINPROGRESS;
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txn = block_job_txn_new();
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job1 = test_block_job_start(1, true, expected1, &result1);
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block_job_txn_add_job(txn, job1);
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job2 = test_block_job_start(2, true, expected2, &result2);
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block_job_txn_add_job(txn, job2);
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if (expected1 == -ECANCELED) {
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block_job_cancel(job1);
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}
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if (expected2 == -ECANCELED) {
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block_job_cancel(job2);
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}
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while (result1 == -EINPROGRESS || result2 == -EINPROGRESS) {
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aio_poll(qemu_get_aio_context(), true);
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}
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/* Failure or cancellation of one job cancels the other job */
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if (expected1 != 0) {
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expected2 = -ECANCELED;
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} else if (expected2 != 0) {
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expected1 = -ECANCELED;
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}
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g_assert_cmpint(result1, ==, expected1);
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g_assert_cmpint(result2, ==, expected2);
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block_job_txn_unref(txn);
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}
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static void test_pair_jobs_success(void)
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{
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test_pair_jobs(0, 0);
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}
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static void test_pair_jobs_failure(void)
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{
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/* Test both orderings. The two jobs run for a different number of
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* iterations so the code path is different depending on which job fails
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* first.
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*/
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test_pair_jobs(-EIO, 0);
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test_pair_jobs(0, -EIO);
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}
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static void test_pair_jobs_cancel(void)
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{
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test_pair_jobs(-ECANCELED, 0);
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test_pair_jobs(0, -ECANCELED);
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}
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static void test_pair_jobs_fail_cancel_race(void)
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{
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BlockJob *job1;
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BlockJob *job2;
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BlockJobTxn *txn;
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int result1 = -EINPROGRESS;
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int result2 = -EINPROGRESS;
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txn = block_job_txn_new();
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job1 = test_block_job_start(1, true, -ECANCELED, &result1);
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block_job_txn_add_job(txn, job1);
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job2 = test_block_job_start(2, false, 0, &result2);
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block_job_txn_add_job(txn, job2);
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block_job_cancel(job1);
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/* Now make job2 finish before the main loop kicks jobs. This simulates
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* the race between a pending kick and another job completing.
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*/
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block_job_enter(job2);
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block_job_enter(job2);
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while (result1 == -EINPROGRESS || result2 == -EINPROGRESS) {
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aio_poll(qemu_get_aio_context(), true);
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}
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g_assert_cmpint(result1, ==, -ECANCELED);
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g_assert_cmpint(result2, ==, -ECANCELED);
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block_job_txn_unref(txn);
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}
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int main(int argc, char **argv)
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{
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qemu_init_main_loop(&error_abort);
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g_test_init(&argc, &argv, NULL);
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g_test_add_func("/single/success", test_single_job_success);
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g_test_add_func("/single/failure", test_single_job_failure);
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g_test_add_func("/single/cancel", test_single_job_cancel);
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g_test_add_func("/pair/success", test_pair_jobs_success);
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g_test_add_func("/pair/failure", test_pair_jobs_failure);
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g_test_add_func("/pair/cancel", test_pair_jobs_cancel);
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g_test_add_func("/pair/fail-cancel-race", test_pair_jobs_fail_cancel_race);
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return g_test_run();
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}
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