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qemuDomainObjBeginNestedJob: Return -2 for temporary failures

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If job queue is full or waiting for a job times out, the function
returns -2 so that it can be handled in a different way by callers.

The change is safe since all existing callers of
qemuDomainObjBeginNestedJob check the return value to be less than zero.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
Jiri Denemark 2014-05-13 14:39:35 +02:00
parent 1643b158f6
commit dca377dbd6
1 changed files with 20 additions and 9 deletions
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29
src/qemu/qemu_domain.c
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@ -1059,6 +1059,7 @@ qemuDomainObjBeginJobInternal(virQEMUDriverPtr driver,
unsigned long long then;
bool nested = job == QEMU_JOB_ASYNC_NESTED;
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
int ret;
VIR_DEBUG("Starting %s: %s (async=%s vm=%p name=%s)",
job == QEMU_JOB_ASYNC ? "async job" : "job",
@ -1135,21 +1136,25 @@ qemuDomainObjBeginJobInternal(virQEMUDriverPtr driver,
qemuDomainAsyncJobTypeToString(priv->job.asyncJob),
priv->job.owner, priv->job.asyncOwner);
if (errno == ETIMEDOUT)
ret = -1;
if (errno == ETIMEDOUT) {
virReportError(VIR_ERR_OPERATION_TIMEOUT,
"%s", _("cannot acquire state change lock"));
else if (cfg->maxQueuedJobs &&
priv->jobs_queued > cfg->maxQueuedJobs)
ret = -2;
} else if (cfg->maxQueuedJobs &&
priv->jobs_queued > cfg->maxQueuedJobs) {
virReportError(VIR_ERR_OPERATION_FAILED,
"%s", _("cannot acquire state change lock "
"due to max_queued limit"));
else
ret = -2;
} else {
virReportSystemError(errno,
"%s", _("cannot acquire job mutex"));
}
priv->jobs_queued--;
virObjectUnref(obj);
virObjectUnref(cfg);
return -1;
return ret;
}
/*
@ -1165,16 +1170,22 @@ int qemuDomainObjBeginJob(virQEMUDriverPtr driver,
virDomainObjPtr obj,
enum qemuDomainJob job)
{
return qemuDomainObjBeginJobInternal(driver, obj, job,
QEMU_ASYNC_JOB_NONE);
if (qemuDomainObjBeginJobInternal(driver, obj, job,
QEMU_ASYNC_JOB_NONE) < 0)
return -1;
else
return 0;
}
int qemuDomainObjBeginAsyncJob(virQEMUDriverPtr driver,
virDomainObjPtr obj,
enum qemuDomainAsyncJob asyncJob)
{
return qemuDomainObjBeginJobInternal(driver, obj, QEMU_JOB_ASYNC,
asyncJob);
if (qemuDomainObjBeginJobInternal(driver, obj, QEMU_JOB_ASYNC,
asyncJob) < 0)
return -1;
else
return 0;
}
static int ATTRIBUTE_RETURN_CHECK