trap signals for "-serial mon:stdio"
[qemu.git] / blockjob.c
1 /*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2011 IBM Corp.
5 * Copyright (c) 2012 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 "config-host.h"
27 #include "qemu-common.h"
28 #include "trace.h"
29 #include "monitor/monitor.h"
30 #include "block/block.h"
31 #include "block/blockjob.h"
32 #include "block/block_int.h"
33 #include "qapi/qmp/qjson.h"
34 #include "block/coroutine.h"
35 #include "qmp-commands.h"
36 #include "qemu/timer.h"
37
38 void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs,
39 int64_t speed, BlockDriverCompletionFunc *cb,
40 void *opaque, Error **errp)
41 {
42 BlockJob *job;
43
44 if (bs->job || bdrv_in_use(bs)) {
45 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
46 return NULL;
47 }
48 bdrv_set_in_use(bs, 1);
49
50 job = g_malloc0(job_type->instance_size);
51 job->job_type = job_type;
52 job->bs = bs;
53 job->cb = cb;
54 job->opaque = opaque;
55 job->busy = true;
56 bs->job = job;
57
58 /* Only set speed when necessary to avoid NotSupported error */
59 if (speed != 0) {
60 Error *local_err = NULL;
61
62 block_job_set_speed(job, speed, &local_err);
63 if (error_is_set(&local_err)) {
64 bs->job = NULL;
65 g_free(job);
66 bdrv_set_in_use(bs, 0);
67 error_propagate(errp, local_err);
68 return NULL;
69 }
70 }
71 return job;
72 }
73
74 void block_job_completed(BlockJob *job, int ret)
75 {
76 BlockDriverState *bs = job->bs;
77
78 assert(bs->job == job);
79 job->cb(job->opaque, ret);
80 bs->job = NULL;
81 g_free(job);
82 bdrv_set_in_use(bs, 0);
83 }
84
85 void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
86 {
87 Error *local_err = NULL;
88
89 if (!job->job_type->set_speed) {
90 error_set(errp, QERR_NOT_SUPPORTED);
91 return;
92 }
93 job->job_type->set_speed(job, speed, &local_err);
94 if (error_is_set(&local_err)) {
95 error_propagate(errp, local_err);
96 return;
97 }
98
99 job->speed = speed;
100 }
101
102 void block_job_complete(BlockJob *job, Error **errp)
103 {
104 if (job->paused || job->cancelled || !job->job_type->complete) {
105 error_set(errp, QERR_BLOCK_JOB_NOT_READY, job->bs->device_name);
106 return;
107 }
108
109 job->job_type->complete(job, errp);
110 }
111
112 void block_job_pause(BlockJob *job)
113 {
114 job->paused = true;
115 }
116
117 bool block_job_is_paused(BlockJob *job)
118 {
119 return job->paused;
120 }
121
122 void block_job_resume(BlockJob *job)
123 {
124 job->paused = false;
125 block_job_iostatus_reset(job);
126 if (job->co && !job->busy) {
127 qemu_coroutine_enter(job->co, NULL);
128 }
129 }
130
131 void block_job_cancel(BlockJob *job)
132 {
133 job->cancelled = true;
134 block_job_resume(job);
135 }
136
137 bool block_job_is_cancelled(BlockJob *job)
138 {
139 return job->cancelled;
140 }
141
142 void block_job_iostatus_reset(BlockJob *job)
143 {
144 job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
145 if (job->job_type->iostatus_reset) {
146 job->job_type->iostatus_reset(job);
147 }
148 }
149
150 struct BlockCancelData {
151 BlockJob *job;
152 BlockDriverCompletionFunc *cb;
153 void *opaque;
154 bool cancelled;
155 int ret;
156 };
157
158 static void block_job_cancel_cb(void *opaque, int ret)
159 {
160 struct BlockCancelData *data = opaque;
161
162 data->cancelled = block_job_is_cancelled(data->job);
163 data->ret = ret;
164 data->cb(data->opaque, ret);
165 }
166
167 int block_job_cancel_sync(BlockJob *job)
168 {
169 struct BlockCancelData data;
170 BlockDriverState *bs = job->bs;
171
172 assert(bs->job == job);
173
174 /* Set up our own callback to store the result and chain to
175 * the original callback.
176 */
177 data.job = job;
178 data.cb = job->cb;
179 data.opaque = job->opaque;
180 data.ret = -EINPROGRESS;
181 job->cb = block_job_cancel_cb;
182 job->opaque = &data;
183 block_job_cancel(job);
184 while (data.ret == -EINPROGRESS) {
185 qemu_aio_wait();
186 }
187 return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret;
188 }
189
190 void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns)
191 {
192 assert(job->busy);
193
194 /* Check cancellation *before* setting busy = false, too! */
195 if (block_job_is_cancelled(job)) {
196 return;
197 }
198
199 job->busy = false;
200 if (block_job_is_paused(job)) {
201 qemu_coroutine_yield();
202 } else {
203 co_sleep_ns(clock, ns);
204 }
205 job->busy = true;
206 }
207
208 BlockJobInfo *block_job_query(BlockJob *job)
209 {
210 BlockJobInfo *info = g_new0(BlockJobInfo, 1);
211 info->type = g_strdup(job->job_type->job_type);
212 info->device = g_strdup(bdrv_get_device_name(job->bs));
213 info->len = job->len;
214 info->busy = job->busy;
215 info->paused = job->paused;
216 info->offset = job->offset;
217 info->speed = job->speed;
218 info->io_status = job->iostatus;
219 return info;
220 }
221
222 static void block_job_iostatus_set_err(BlockJob *job, int error)
223 {
224 if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
225 job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
226 BLOCK_DEVICE_IO_STATUS_FAILED;
227 }
228 }
229
230
231 QObject *qobject_from_block_job(BlockJob *job)
232 {
233 return qobject_from_jsonf("{ 'type': %s,"
234 "'device': %s,"
235 "'len': %" PRId64 ","
236 "'offset': %" PRId64 ","
237 "'speed': %" PRId64 " }",
238 job->job_type->job_type,
239 bdrv_get_device_name(job->bs),
240 job->len,
241 job->offset,
242 job->speed);
243 }
244
245 void block_job_ready(BlockJob *job)
246 {
247 QObject *data = qobject_from_block_job(job);
248 monitor_protocol_event(QEVENT_BLOCK_JOB_READY, data);
249 qobject_decref(data);
250 }
251
252 BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs,
253 BlockdevOnError on_err,
254 int is_read, int error)
255 {
256 BlockErrorAction action;
257
258 switch (on_err) {
259 case BLOCKDEV_ON_ERROR_ENOSPC:
260 action = (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT;
261 break;
262 case BLOCKDEV_ON_ERROR_STOP:
263 action = BDRV_ACTION_STOP;
264 break;
265 case BLOCKDEV_ON_ERROR_REPORT:
266 action = BDRV_ACTION_REPORT;
267 break;
268 case BLOCKDEV_ON_ERROR_IGNORE:
269 action = BDRV_ACTION_IGNORE;
270 break;
271 default:
272 abort();
273 }
274 bdrv_emit_qmp_error_event(job->bs, QEVENT_BLOCK_JOB_ERROR, action, is_read);
275 if (action == BDRV_ACTION_STOP) {
276 block_job_pause(job);
277 block_job_iostatus_set_err(job, error);
278 if (bs != job->bs) {
279 bdrv_iostatus_set_err(bs, error);
280 }
281 }
282 return action;
283 }