job-qmp.c

   1 /*
   2  * QMP interface for background jobs
   3  *
   4  * Copyright (c) 2011 IBM Corp.
   5  * Copyright (c) 2012, 2018 Red Hat, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "qemu/job.h"
  28 #include "qapi/qapi-commands-job.h"
  29 #include "qapi/error.h"
  30 #include "trace/trace-root.h"
  31
  32 /*
  33  * Get a job using its ID. Called with job_mutex held.
  34  */
  35 static Job *find_job_locked(const char *id, Error **errp)
  36 {
  37     Job *job;
  38
  39     job = job_get_locked(id);
  40     if (!job) {
  41         error_setg(errp, "Job not found");
  42         return NULL;
  43     }
  44
  45     return job;
  46 }
  47
  48 void qmp_job_cancel(const char *id, Error **errp)
  49 {
  50     Job *job;
  51
  52     JOB_LOCK_GUARD();
  53     job = find_job_locked(id, errp);
  54
  55     if (!job) {
  56         return;
  57     }
  58
  59     trace_qmp_job_cancel(job);
  60     job_user_cancel_locked(job, true, errp);
  61 }
  62
  63 void qmp_job_pause(const char *id, Error **errp)
  64 {
  65     Job *job;
  66
  67     JOB_LOCK_GUARD();
  68     job = find_job_locked(id, errp);
  69
  70     if (!job) {
  71         return;
  72     }
  73
  74     trace_qmp_job_pause(job);
  75     job_user_pause_locked(job, errp);
  76 }
  77
  78 void qmp_job_resume(const char *id, Error **errp)
  79 {
  80     Job *job;
  81
  82     JOB_LOCK_GUARD();
  83     job = find_job_locked(id, errp);
  84
  85     if (!job) {
  86         return;
  87     }
  88
  89     trace_qmp_job_resume(job);
  90     job_user_resume_locked(job, errp);
  91 }
  92
  93 void qmp_job_complete(const char *id, Error **errp)
  94 {
  95     Job *job;
  96
  97     JOB_LOCK_GUARD();
  98     job = find_job_locked(id, errp);
  99
 100     if (!job) {
 101         return;
 102     }
 103
 104     trace_qmp_job_complete(job);
 105     job_complete_locked(job, errp);
 106 }
 107
 108 void qmp_job_finalize(const char *id, Error **errp)
 109 {
 110     Job *job;
 111
 112     JOB_LOCK_GUARD();
 113     job = find_job_locked(id, errp);
 114
 115     if (!job) {
 116         return;
 117     }
 118
 119     trace_qmp_job_finalize(job);
 120     job_ref_locked(job);
 121     job_finalize_locked(job, errp);
 122
 123     job_unref_locked(job);
 124 }
 125
 126 void qmp_job_dismiss(const char *id, Error **errp)
 127 {
 128     Job *job;
 129
 130     JOB_LOCK_GUARD();
 131     job = find_job_locked(id, errp);
 132
 133     if (!job) {
 134         return;
 135     }
 136
 137     trace_qmp_job_dismiss(job);
 138     job_dismiss_locked(&job, errp);
 139 }
 140
 141 /* Called with job_mutex held. */
 142 static JobInfo *job_query_single_locked(Job *job, Error **errp)
 143 {
 144     JobInfo *info;
 145     uint64_t progress_current;
 146     uint64_t progress_total;
 147
 148     assert(!job_is_internal(job));
 149     progress_get_snapshot(&job->progress, &progress_current,
 150                           &progress_total);
 151
 152     info = g_new(JobInfo, 1);
 153     *info = (JobInfo) {
 154         .id                 = g_strdup(job->id),
 155         .type               = job_type(job),
 156         .status             = job->status,
 157         .current_progress   = progress_current,
 158         .total_progress     = progress_total,
 159         .error              = job->err ?
 160                               g_strdup(error_get_pretty(job->err)) : NULL,
 161     };
 162
 163     return info;
 164 }
 165
 166 JobInfoList *qmp_query_jobs(Error **errp)
 167 {
 168     JobInfoList *head = NULL, **tail = &head;
 169     Job *job;
 170
 171     JOB_LOCK_GUARD();
 172
 173     for (job = job_next_locked(NULL); job; job = job_next_locked(job)) {
 174         JobInfo *value;
 175
 176         if (job_is_internal(job)) {
 177             continue;
 178         }
 179         value = job_query_single_locked(job, errp);
 180         if (!value) {
 181             qapi_free_JobInfoList(head);
 182             return NULL;
 183         }
 184         QAPI_LIST_APPEND(tail, value);
 185     }
 186
 187     return head;
 188 }