qemu/job-qmp.c
Emanuele Giuseppe Esposito a7b4f8fc09 progressmeter: protect with a mutex
Progressmeter is protected by the AioContext mutex, which
is taken by the block jobs and their caller (like blockdev).

We would like to remove the dependency of block layer code on the
AioContext mutex, since most drivers and the core I/O code are already
not relying on it.

Create a new C file to implement the ProgressMeter API, but keep the
struct as public, to avoid forcing allocation on the heap.

Also add a mutex to be able to provide an accurate snapshot of the
progress values to the caller.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20210614081130.22134-5-eesposit@redhat.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
2021-06-25 14:24:24 +03:00

194 lines
4.9 KiB
C

/*
* 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 */
static Job *find_job(const char *id, AioContext **aio_context, Error **errp)
{
Job *job;
*aio_context = NULL;
job = job_get(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 = find_job(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_cancel(job);
job_user_cancel(job, true, errp);
aio_context_release(aio_context);
}
void qmp_job_pause(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job = find_job(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_pause(job);
job_user_pause(job, errp);
aio_context_release(aio_context);
}
void qmp_job_resume(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job = find_job(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_resume(job);
job_user_resume(job, errp);
aio_context_release(aio_context);
}
void qmp_job_complete(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job = find_job(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_complete(job);
job_complete(job, errp);
aio_context_release(aio_context);
}
void qmp_job_finalize(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job = find_job(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_finalize(job);
job_ref(job);
job_finalize(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(job);
aio_context_release(aio_context);
}
void qmp_job_dismiss(const char *id, Error **errp)
{
AioContext *aio_context;
Job *job = find_job(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_job_dismiss(job);
job_dismiss(&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;
}