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From 1c16ba251ec8d0bf64ee34a0ef71b5912907de12 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Fri, 14 Sep 2018 10:55:29 +0200
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Subject: [PATCH 38/49] job: Use AIO_WAIT_WHILE() in job_finish_sync()
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20180914105540.18077-32-kwolf@redhat.com>
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Patchwork-id: 82184
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O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH 31/42] job: Use AIO_WAIT_WHILE() in job_finish_sync()
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Bugzilla: 1601212
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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job_finish_sync() needs to release the AioContext lock of the job before
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calling aio_poll(). Otherwise, callbacks called by aio_poll() would
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possibly take the lock a second time and run into a deadlock with a
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nested AIO_WAIT_WHILE() call.
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Also, job_drain() without aio_poll() isn't necessarily enough to make
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progress on a job, it could depend on bottom halves to be executed.
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Combine both open-coded while loops into a single AIO_WAIT_WHILE() call
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that solves both of these problems.
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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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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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job.c | 14 ++++++--------
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1 file changed, 6 insertions(+), 8 deletions(-)
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diff --git a/job.c b/job.c
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index 5a0ccc7..47b5a11 100644
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--- a/job.c
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+++ b/job.c
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@@ -29,6 +29,7 @@
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#include "qemu/job.h"
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#include "qemu/id.h"
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#include "qemu/main-loop.h"
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+#include "block/aio-wait.h"
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#include "trace-root.h"
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#include "qapi/qapi-events-job.h"
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@@ -957,6 +958,7 @@ void job_complete(Job *job, Error **errp)
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int job_finish_sync(Job *job, void (*finish)(Job *, Error **errp), Error **errp)
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{
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Error *local_err = NULL;
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+ AioWait dummy_wait = {};
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int ret;
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job_ref(job);
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@@ -969,14 +971,10 @@ int job_finish_sync(Job *job, void (*finish)(Job *, Error **errp), Error **errp)
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job_unref(job);
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return -EBUSY;
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}
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- /* job_drain calls job_enter, and it should be enough to induce progress
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- * until the job completes or moves to the main thread. */
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- while (!job->deferred_to_main_loop && !job_is_completed(job)) {
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- job_drain(job);
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- }
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- while (!job_is_completed(job)) {
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- aio_poll(qemu_get_aio_context(), true);
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- }
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+
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+ AIO_WAIT_WHILE(&dummy_wait, job->aio_context,
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+ (job_drain(job), !job_is_completed(job)));
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+
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ret = (job_is_cancelled(job) && job->ret == 0) ? -ECANCELED : job->ret;
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job_unref(job);
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return ret;
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--
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1.8.3.1
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