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Blame SOURCES/kvm-test-bdrv-drain-Drain-with-block-jobs-in-an-I-O-thre.patch

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From f894047d028d1b80ab1aeb954464542f89d66f8f Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Wed, 10 Oct 2018 20:21:58 +0100
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Subject: [PATCH 32/49] test-bdrv-drain: Drain with block jobs in an I/O thread
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20181010202213.7372-20-kwolf@redhat.com>
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Patchwork-id: 82608
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O-Subject: [RHEL-8 qemu-kvm PATCH 29/44] test-bdrv-drain: Drain with block jobs in an I/O thread
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Bugzilla: 1637976
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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This extends the existing drain test with a block job to include
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variants where the block job runs in a different AioContext.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Fam Zheng <famz@redhat.com>
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(cherry picked from commit f62c172959cd2b6de4dd8ba782e855d64d94764b)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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 tests/test-bdrv-drain.c | 92 +++++++++++++++++++++++++++++++++++++++++++++----
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 1 file changed, 86 insertions(+), 6 deletions(-)
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diff --git a/tests/test-bdrv-drain.c b/tests/test-bdrv-drain.c
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index 9bcb3c7..3cf3ba3 100644
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--- a/tests/test-bdrv-drain.c
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+++ b/tests/test-bdrv-drain.c
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@@ -174,6 +174,28 @@ static void do_drain_end(enum drain_type drain_type, BlockDriverState *bs)
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     }
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 }
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+static void do_drain_begin_unlocked(enum drain_type drain_type, BlockDriverState *bs)
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+{
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+    if (drain_type != BDRV_DRAIN_ALL) {
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+        aio_context_acquire(bdrv_get_aio_context(bs));
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+    }
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+    do_drain_begin(drain_type, bs);
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+    if (drain_type != BDRV_DRAIN_ALL) {
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+        aio_context_release(bdrv_get_aio_context(bs));
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+    }
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+}
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+
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+static void do_drain_end_unlocked(enum drain_type drain_type, BlockDriverState *bs)
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+{
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+    if (drain_type != BDRV_DRAIN_ALL) {
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+        aio_context_acquire(bdrv_get_aio_context(bs));
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+    }
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+    do_drain_end(drain_type, bs);
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+    if (drain_type != BDRV_DRAIN_ALL) {
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+        aio_context_release(bdrv_get_aio_context(bs));
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+    }
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+}
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+
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 static void test_drv_cb_common(enum drain_type drain_type, bool recursive)
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 {
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     BlockBackend *blk;
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@@ -785,11 +807,13 @@ BlockJobDriver test_job_driver = {
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     },
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 };
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-static void test_blockjob_common(enum drain_type drain_type)
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+static void test_blockjob_common(enum drain_type drain_type, bool use_iothread)
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 {
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     BlockBackend *blk_src, *blk_target;
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     BlockDriverState *src, *target;
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     BlockJob *job;
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+    IOThread *iothread = NULL;
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+    AioContext *ctx;
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     int ret;
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     src = bdrv_new_open_driver(&bdrv_test, "source", BDRV_O_RDWR,
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@@ -797,21 +821,31 @@ static void test_blockjob_common(enum drain_type drain_type)
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     blk_src = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
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     blk_insert_bs(blk_src, src, &error_abort);
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+    if (use_iothread) {
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+        iothread = iothread_new();
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+        ctx = iothread_get_aio_context(iothread);
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+        blk_set_aio_context(blk_src, ctx);
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+    } else {
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+        ctx = qemu_get_aio_context();
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+    }
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+
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     target = bdrv_new_open_driver(&bdrv_test, "target", BDRV_O_RDWR,
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                                   &error_abort);
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     blk_target = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
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     blk_insert_bs(blk_target, target, &error_abort);
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+    aio_context_acquire(ctx);
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     job = block_job_create("job0", &test_job_driver, NULL, src, 0, BLK_PERM_ALL,
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                            0, 0, NULL, NULL, &error_abort);
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     block_job_add_bdrv(job, "target", target, 0, BLK_PERM_ALL, &error_abort);
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     job_start(&job->job);
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+    aio_context_release(ctx);
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     g_assert_cmpint(job->job.pause_count, ==, 0);
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     g_assert_false(job->job.paused);
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     g_assert_true(job->job.busy); /* We're in job_sleep_ns() */
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-    do_drain_begin(drain_type, src);
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+    do_drain_begin_unlocked(drain_type, src);
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     if (drain_type == BDRV_DRAIN_ALL) {
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         /* bdrv_drain_all() drains both src and target */
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@@ -822,7 +856,14 @@ static void test_blockjob_common(enum drain_type drain_type)
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     g_assert_true(job->job.paused);
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     g_assert_false(job->job.busy); /* The job is paused */
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-    do_drain_end(drain_type, src);
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+    do_drain_end_unlocked(drain_type, src);
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+
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+    if (use_iothread) {
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+        /* paused is reset in the I/O thread, wait for it */
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+        while (job->job.paused) {
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+            aio_poll(qemu_get_aio_context(), false);
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+        }
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+    }
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     g_assert_cmpint(job->job.pause_count, ==, 0);
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     g_assert_false(job->job.paused);
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@@ -841,32 +882,64 @@ static void test_blockjob_common(enum drain_type drain_type)
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     do_drain_end(drain_type, target);
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+    if (use_iothread) {
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+        /* paused is reset in the I/O thread, wait for it */
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+        while (job->job.paused) {
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+            aio_poll(qemu_get_aio_context(), false);
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+        }
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+    }
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+
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     g_assert_cmpint(job->job.pause_count, ==, 0);
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     g_assert_false(job->job.paused);
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     g_assert_true(job->job.busy); /* We're in job_sleep_ns() */
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+    aio_context_acquire(ctx);
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     ret = job_complete_sync(&job->job, &error_abort);
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     g_assert_cmpint(ret, ==, 0);
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+    if (use_iothread) {
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+        blk_set_aio_context(blk_src, qemu_get_aio_context());
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+    }
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+    aio_context_release(ctx);
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+
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     blk_unref(blk_src);
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     blk_unref(blk_target);
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     bdrv_unref(src);
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     bdrv_unref(target);
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+
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+    if (iothread) {
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+        iothread_join(iothread);
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+    }
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 }
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 static void test_blockjob_drain_all(void)
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 {
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-    test_blockjob_common(BDRV_DRAIN_ALL);
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+    test_blockjob_common(BDRV_DRAIN_ALL, false);
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 }
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 static void test_blockjob_drain(void)
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 {
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-    test_blockjob_common(BDRV_DRAIN);
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+    test_blockjob_common(BDRV_DRAIN, false);
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 }
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 static void test_blockjob_drain_subtree(void)
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 {
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-    test_blockjob_common(BDRV_SUBTREE_DRAIN);
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+    test_blockjob_common(BDRV_SUBTREE_DRAIN, false);
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+}
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+
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+static void test_blockjob_iothread_drain_all(void)
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+{
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+    test_blockjob_common(BDRV_DRAIN_ALL, true);
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+}
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+
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+static void test_blockjob_iothread_drain(void)
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+{
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+    test_blockjob_common(BDRV_DRAIN, true);
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+}
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+
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+static void test_blockjob_iothread_drain_subtree(void)
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+{
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+    test_blockjob_common(BDRV_SUBTREE_DRAIN, true);
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 }
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@@ -1337,6 +1410,13 @@ int main(int argc, char **argv)
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     g_test_add_func("/bdrv-drain/blockjob/drain_subtree",
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                     test_blockjob_drain_subtree);
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+    g_test_add_func("/bdrv-drain/blockjob/iothread/drain_all",
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+                    test_blockjob_iothread_drain_all);
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+    g_test_add_func("/bdrv-drain/blockjob/iothread/drain",
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+                    test_blockjob_iothread_drain);
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+    g_test_add_func("/bdrv-drain/blockjob/iothread/drain_subtree",
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+                    test_blockjob_iothread_drain_subtree);
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+
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     g_test_add_func("/bdrv-drain/deletion/drain", test_delete_by_drain);
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     g_test_add_func("/bdrv-drain/detach/drain_all", test_detach_by_drain_all);
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     g_test_add_func("/bdrv-drain/detach/drain", test_detach_by_drain);
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-- 
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1.8.3.1
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