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job: add .cancel handler for the driver

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To be used in mirror in the following commit to cancel in-flight io on
target to not waste the time.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210205163720.887197-5-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-02-05 19:37:14 +03:00 committed by Eric Blake
parent 3fc1ec3725
commit 9820933b57
2 changed files with 8 additions and 0 deletions
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5
include/qemu/job.h
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@ -251,6 +251,11 @@ struct JobDriver {
*/ */
void (*clean)(Job *job); void (*clean)(Job *job);
/**
* If the callback is not NULL, it will be invoked in job_cancel_async
*/
void (*cancel)(Job *job);
/** Called when the job is freed */ /** Called when the job is freed */
void (*free)(Job *job); void (*free)(Job *job);

3
job.c
View File

@ -715,6 +715,9 @@ static int job_finalize_single(Job *job)
static void job_cancel_async(Job *job, bool force) static void job_cancel_async(Job *job, bool force)
{ {
if (job->driver->cancel) {
job->driver->cancel(job);
}
if (job->user_paused) { if (job->user_paused) {
/* Do not call job_enter here, the caller will handle it. */ /* Do not call job_enter here, the caller will handle it. */
if (job->driver->user_resume) { if (job->driver->user_resume) {