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jobs: remove ret argument to job_completed; privatize it 

Jobs are now expected to return their retcode on the stack, from the
.run callback, so we can remove that argument.

job_cancel does not need to set -ECANCELED because job_completed will
update the return code itself if the job was canceled.

While we're here, make job_completed static to job.c and remove it from
job.h; move the documentation of return code to the .run() callback and
to the job->ret property, accordingly.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20180830015734.19765-9-jsnow@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
John Snow 2018-08-29 21:57:33 -04:00 committed by Max Reitz
parent 6870277535
commit 404ff28d6a
3 changed files with 22 additions and 19 deletions
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28
include/qemu/job.h
View File

@ -124,7 +124,11 @@ typedef struct Job {
/** Estimated progress_current value at the completion of the job */
int64_t progress_total;
/** ret code passed to job_completed. */
/**
* Return code from @run and/or @prepare callback(s).
* Not final until the job has reached the CONCLUDED status.
* 0 on success, -errno on failure.
*/
int ret;
/**
@ -172,7 +176,16 @@ struct JobDriver {
/** Enum describing the operation */
JobType job_type;
/** Mandatory: Entrypoint for the Coroutine. */
/**
* Mandatory: Entrypoint for the Coroutine.
*
* This callback will be invoked when moving from CREATED to RUNNING.
*
* If this callback returns nonzero, the job transaction it is part of is
* aborted. If it returns zero, the job moves into the WAITING state. If it
* is the last job to complete in its transaction, all jobs in the
* transaction move from WAITING to PENDING.
*/
int coroutine_fn (*run)(Job *job, Error **errp);
/**
@ -496,17 +509,6 @@ void job_early_fail(Job *job);
/** Moves the @job from RUNNING to READY */
void job_transition_to_ready(Job *job);
/**
* @job: The job being completed.
* @ret: The status code.
*
* Marks @job as completed. If @ret is non-zero, the job transaction it is part
* of is aborted. If @ret is zero, the job moves into the WAITING state. If it
* is the last job to complete in its transaction, all jobs in the transaction
* move from WAITING to PENDING.
*/
void job_completed(Job *job, int ret);
/** Asynchronously complete the specified @job. */
void job_complete(Job *job, Error **errp);

11
job.c
View File

@ -535,6 +535,8 @@ void job_drain(Job *job)
}
}
static void job_completed(Job *job);
static void job_exit(void *opaque)
{
Job *job = (Job *)opaque;
@ -545,7 +547,7 @@ static void job_exit(void *opaque)
job->driver->exit(job);
aio_context_release(aio_context);
}
job_completed(job, job->ret);
job_completed(job);
}
/**
@ -883,13 +885,12 @@ static void job_completed_txn_success(Job *job)
}
}
void job_completed(Job *job, int ret)
static void job_completed(Job *job)
{
assert(job && job->txn && !job_is_completed(job));
job->ret = ret;
job_update_rc(job);
trace_job_completed(job, ret, job->ret);
trace_job_completed(job, job->ret);
if (job->ret) {
job_completed_txn_abort(job);
} else {
@ -905,7 +906,7 @@ void job_cancel(Job *job, bool force)
}
job_cancel_async(job, force);
if (!job_started(job)) {
job_completed(job, -ECANCELED);
job_completed(job);
} else if (job->deferred_to_main_loop) {
job_completed_txn_abort(job);
} else {

2
trace-events
View File

@ -107,7 +107,7 @@ gdbstub_err_checksum_incorrect(uint8_t expected, uint8_t got) "got command packe
# job.c
job_state_transition(void *job, int ret, const char *legal, const char *s0, const char *s1) "job %p (ret: %d) attempting %s transition (%s-->%s)"
job_apply_verb(void *job, const char *state, const char *verb, const char *legal) "job %p in state %s; applying verb %s (%s)"
job_completed(void *job, int ret, int jret) "job %p ret %d corrected ret %d"
job_completed(void *job, int ret) "job %p ret %d"
# job-qmp.c
qmp_job_cancel(void *job) "job %p"