xemu/job-qmp.c

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/*
* QMP interface for background jobs
*
* Copyright (c) 2011 IBM Corp.
* Copyright (c) 2012, 2018 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/job.h"
#include "qapi/qapi-commands-job.h"
#include "qapi/error.h"
#include "trace/trace-root.h"
/*
* Get a job using its ID and acquire its AioContext.
* Called with job_mutex held.
*/
static Job *find_job_locked(const char *id,
AioContext **aio_context,
Error **errp)
{
Job *job;
*aio_context = NULL;
job = job_get_locked(id);
if (!job) {
error_setg(errp, "Job not found");
return NULL;
}
*aio_context = job->aio_context;
aio_context_acquire(*aio_context);
return job;
}
void qmp_job_cancel(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job;
JOB_LOCK_GUARD();
job = find_job_locked(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_cancel(job);
job_user_cancel_locked(job, true, errp);
aio_context_release(aio_context);
}
void qmp_job_pause(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job;
JOB_LOCK_GUARD();
job = find_job_locked(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_pause(job);
job_user_pause_locked(job, errp);
aio_context_release(aio_context);
}
void qmp_job_resume(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job;
JOB_LOCK_GUARD();
job = find_job_locked(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_resume(job);
job_user_resume_locked(job, errp);
aio_context_release(aio_context);
}
void qmp_job_complete(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job;
JOB_LOCK_GUARD();
job = find_job_locked(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_complete(job);
job_complete_locked(job, errp);
aio_context_release(aio_context);
}
void qmp_job_finalize(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job;
JOB_LOCK_GUARD();
job = find_job_locked(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_finalize(job);
job_ref_locked(job);
job_finalize_locked(job, errp);
/*
* Job's context might have changed via job_finalize (and job_txn_apply
* automatically acquires the new one), so make sure we release the correct
* one.
*/
aio_context = job->aio_context;
job_unref_locked(job);
aio_context_release(aio_context);
}
void qmp_job_dismiss(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job;
JOB_LOCK_GUARD();
job = find_job_locked(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_dismiss(job);
job_dismiss_locked(&job, errp);
aio_context_release(aio_context);
}
static JobInfo *job_query_single(Job *job, Error **errp)
{
JobInfo *info;
uint64_t progress_current;
uint64_t progress_total;
assert(!job_is_internal(job));
progress_get_snapshot(&job->progress, &progress_current,
&progress_total);
info = g_new(JobInfo, 1);
*info = (JobInfo) {
.id = g_strdup(job->id),
.type = job_type(job),
.status = job->status,
.current_progress = progress_current,
.total_progress = progress_total,
.has_error = !!job->err,
.error = job->err ? \
g_strdup(error_get_pretty(job->err)) : NULL,
};
return info;
}
JobInfoList *qmp_query_jobs(Error **errp)
{
JobInfoList *head = NULL, **tail = &head;
Job *job;
for (job = job_next(NULL); job; job = job_next(job)) {
JobInfo *value;
AioContext *aio_context;
if (job_is_internal(job)) {
continue;
}
aio_context = job->aio_context;
aio_context_acquire(aio_context);
value = job_query_single(job, errp);
aio_context_release(aio_context);
if (!value) {
qapi_free_JobInfoList(head);
return NULL;
}
QAPI_LIST_APPEND(tail, value);
}
return head;
}