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blockjob: add .start field

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Add an explicit start field to specify the entrypoint. We already have
ownership of the coroutine itself AND managing the lifetime of the
coroutine, let's take control of creation of the coroutine, too.

This will allow us to delay creation of the actual coroutine until we
know we'll actually start a BlockJob in block_job_start. This avoids
the sticky question of how to "un-create" a Coroutine that hasn't been
started yet.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 1478587839-9834-4-git-send-email-jsnow@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
John Snow
2016-11-08 01:50:36 -05:00
committed by Jeff Cody
parent e8a40bf71d
commit a7815a764c
5 changed files with 23 additions and 15 deletions
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3
block/commit.c
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@@ -205,6 +205,7 @@ static const BlockJobDriver commit_job_driver = {
.instance_size = sizeof(CommitBlockJob),
.job_type = BLOCK_JOB_TYPE_COMMIT,
.set_speed = commit_set_speed,
.start = commit_run,
};
void commit_start(const char *job_id, BlockDriverState *bs,
@@ -288,7 +289,7 @@ 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(commit_run, s);
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);