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blockjob: add block_job_start

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Instead of automatically starting jobs at creation time via backup_start
et al, we'd like to return a job object pointer that can be started
manually at later point in time.

For now, add the block_job_start mechanism and start the jobs
automatically as we have been doing, with conversions job-by-job coming
in later patches.

Of note: cancellation of unstarted jobs will perform all the normal
cleanup as if the job had started, particularly abort and clean. The
only difference is that we will not emit any events, because the job
never actually started.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1478587839-9834-5-git-send-email-jsnow@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
John Snow 2016-11-08 01:50:37 -05:00 • committed by Jeff Cody
parent a7815a764c
commit 5ccac6f186
8 changed files with 67 additions and 32 deletions
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5
block/commit.c
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@ -289,10 +289,9 @@ void commit_start(const char *job_id, BlockDriverState *bs,
s->backing_file_str = g_strdup(backing_file_str);
s->on_error = on_error;
s->common.co = qemu_coroutine_create(s->common.driver->start, s);
trace_commit_start(bs, base, top, s, s->common.co);
qemu_coroutine_enter(s->common.co);
trace_commit_start(bs, base, top, s);
block_job_start(&s->common);
}