We cannot yet move the whole logic around job cancelling to Job because it depends on quite a few other things that are still only in BlockJob, but we can move the cancelled field at least. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com>
133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/*
|
|
* Declarations 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.
|
|
*/
|
|
|
|
#ifndef JOB_H
|
|
#define JOB_H
|
|
|
|
#include "qapi/qapi-types-block-core.h"
|
|
#include "qemu/queue.h"
|
|
|
|
typedef struct JobDriver JobDriver;
|
|
|
|
/**
|
|
* Long-running operation.
|
|
*/
|
|
typedef struct Job {
|
|
/** The ID of the job. May be NULL for internal jobs. */
|
|
char *id;
|
|
|
|
/** The type of this job. */
|
|
const JobDriver *driver;
|
|
|
|
/** Reference count of the block job */
|
|
int refcnt;
|
|
|
|
/** Current state; See @JobStatus for details. */
|
|
JobStatus status;
|
|
|
|
/**
|
|
* Set to true if the job should cancel itself. The flag must
|
|
* always be tested just before toggling the busy flag from false
|
|
* to true. After a job has been cancelled, it should only yield
|
|
* if #aio_poll will ("sooner or later") reenter the coroutine.
|
|
*/
|
|
bool cancelled;
|
|
|
|
/** Element of the list of jobs */
|
|
QLIST_ENTRY(Job) job_list;
|
|
} Job;
|
|
|
|
/**
|
|
* Callbacks and other information about a Job driver.
|
|
*/
|
|
struct JobDriver {
|
|
/** Derived Job struct size */
|
|
size_t instance_size;
|
|
|
|
/** Enum describing the operation */
|
|
JobType job_type;
|
|
|
|
/** Called when the job is freed */
|
|
void (*free)(Job *job);
|
|
};
|
|
|
|
|
|
/**
|
|
* Create a new long-running job and return it.
|
|
*
|
|
* @job_id: The id of the newly-created job, or %NULL for internal jobs
|
|
* @driver: The class object for the newly-created job.
|
|
* @errp: Error object.
|
|
*/
|
|
void *job_create(const char *job_id, const JobDriver *driver, Error **errp);
|
|
|
|
/**
|
|
* Add a reference to Job refcnt, it will be decreased with job_unref, and then
|
|
* be freed if it comes to be the last reference.
|
|
*/
|
|
void job_ref(Job *job);
|
|
|
|
/**
|
|
* Release a reference that was previously acquired with job_ref() or
|
|
* job_create(). If it's the last reference to the object, it will be freed.
|
|
*/
|
|
void job_unref(Job *job);
|
|
|
|
/** Returns the JobType of a given Job. */
|
|
JobType job_type(const Job *job);
|
|
|
|
/** Returns the enum string for the JobType of a given Job. */
|
|
const char *job_type_str(const Job *job);
|
|
|
|
/** Returns whether the job is scheduled for cancellation. */
|
|
bool job_is_cancelled(Job *job);
|
|
|
|
/**
|
|
* Get the next element from the list of block jobs after @job, or the
|
|
* first one if @job is %NULL.
|
|
*
|
|
* Returns the requested job, or %NULL if there are no more jobs left.
|
|
*/
|
|
Job *job_next(Job *job);
|
|
|
|
/**
|
|
* Get the job identified by @id (which must not be %NULL).
|
|
*
|
|
* Returns the requested job, or %NULL if it doesn't exist.
|
|
*/
|
|
Job *job_get(const char *id);
|
|
|
|
/**
|
|
* Check whether the verb @verb can be applied to @job in its current state.
|
|
* Returns 0 if the verb can be applied; otherwise errp is set and -EPERM
|
|
* returned.
|
|
*/
|
|
int job_apply_verb(Job *job, JobVerb verb, Error **errp);
|
|
|
|
/* TODO To be removed from the public interface */
|
|
void job_state_transition(Job *job, JobStatus s1);
|
|
|
|
#endif
|