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mmu-hash32: Split direct store segment handling into a helper
[mirror_qemu.git] / blockjob.c
CommitLineData
2f0c9fe6
PB
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"
83c9089e 29#include "monitor/monitor.h"
737e150e
PB
30#include "block/block.h"
31#include "block/blockjob.h"
32#include "block/block_int.h"
7b1b5d19 33#include "qapi/qmp/qjson.h"
737e150e 34#include "block/coroutine.h"
2f0c9fe6 35#include "qmp-commands.h"
1de7afc9 36#include "qemu/timer.h"
2f0c9fe6
PB
37
38void *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
65f46322 74void block_job_completed(BlockJob *job, int ret)
2f0c9fe6
PB
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
85void 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
aeae883b
PB
102void 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
8acc72a4 112void block_job_pause(BlockJob *job)
2f0c9fe6 113{
8acc72a4
PB
114 job->paused = true;
115}
116
117bool block_job_is_paused(BlockJob *job)
118{
119 return job->paused;
120}
121
122void block_job_resume(BlockJob *job)
123{
124 job->paused = false;
32c81a4a 125 block_job_iostatus_reset(job);
2f0c9fe6
PB
126 if (job->co && !job->busy) {
127 qemu_coroutine_enter(job->co, NULL);
128 }
129}
130
8acc72a4
PB
131void block_job_cancel(BlockJob *job)
132{
133 job->cancelled = true;
134 block_job_resume(job);
135}
136
2f0c9fe6
PB
137bool block_job_is_cancelled(BlockJob *job)
138{
139 return job->cancelled;
140}
141
32c81a4a
PB
142void block_job_iostatus_reset(BlockJob *job)
143{
144 job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
3bd293c3
PB
145 if (job->job_type->iostatus_reset) {
146 job->job_type->iostatus_reset(job);
147 }
32c81a4a
PB
148}
149
2f0c9fe6
PB
150struct BlockCancelData {
151 BlockJob *job;
152 BlockDriverCompletionFunc *cb;
153 void *opaque;
154 bool cancelled;
155 int ret;
156};
157
158static 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
167int 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
190void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns)
191{
8acc72a4
PB
192 assert(job->busy);
193
2f0c9fe6 194 /* Check cancellation *before* setting busy = false, too! */
8acc72a4
PB
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 {
2f0c9fe6 203 co_sleep_ns(clock, ns);
2f0c9fe6 204 }
8acc72a4 205 job->busy = true;
2f0c9fe6 206}
30e628b7
PB
207
208BlockJobInfo *block_job_query(BlockJob *job)
209{
210 BlockJobInfo *info = g_new0(BlockJobInfo, 1);
32c81a4a
PB
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;
30e628b7
PB
219 return info;
220}
32c81a4a
PB
221
222static 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
a66a2a36
PB
231QObject *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
245void 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
32c81a4a
PB
252BlockErrorAction 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}