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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" |
5a2d2cbd | 37 | #include "qapi-event.h" |
2f0c9fe6 | 38 | |
3fc4b10a | 39 | void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs, |
2f0c9fe6 PB |
40 | int64_t speed, BlockDriverCompletionFunc *cb, |
41 | void *opaque, Error **errp) | |
42 | { | |
43 | BlockJob *job; | |
44 | ||
628ff683 | 45 | if (bs->job) { |
2f0c9fe6 PB |
46 | error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); |
47 | return NULL; | |
48 | } | |
fa510ebf | 49 | bdrv_ref(bs); |
3fc4b10a | 50 | job = g_malloc0(driver->instance_size); |
3718d8ab FZ |
51 | error_setg(&job->blocker, "block device is in use by block job: %s", |
52 | BlockJobType_lookup[driver->job_type]); | |
53 | bdrv_op_block_all(bs, job->blocker); | |
54 | ||
3fc4b10a | 55 | job->driver = driver; |
2f0c9fe6 PB |
56 | job->bs = bs; |
57 | job->cb = cb; | |
58 | job->opaque = opaque; | |
59 | job->busy = true; | |
60 | bs->job = job; | |
61 | ||
62 | /* Only set speed when necessary to avoid NotSupported error */ | |
63 | if (speed != 0) { | |
64 | Error *local_err = NULL; | |
65 | ||
66 | block_job_set_speed(job, speed, &local_err); | |
84d18f06 | 67 | if (local_err) { |
2f0c9fe6 | 68 | bs->job = NULL; |
3718d8ab FZ |
69 | bdrv_op_unblock_all(bs, job->blocker); |
70 | error_free(job->blocker); | |
2f0c9fe6 | 71 | g_free(job); |
2f0c9fe6 PB |
72 | error_propagate(errp, local_err); |
73 | return NULL; | |
74 | } | |
75 | } | |
76 | return job; | |
77 | } | |
78 | ||
65f46322 | 79 | void block_job_completed(BlockJob *job, int ret) |
2f0c9fe6 PB |
80 | { |
81 | BlockDriverState *bs = job->bs; | |
82 | ||
83 | assert(bs->job == job); | |
84 | job->cb(job->opaque, ret); | |
85 | bs->job = NULL; | |
3718d8ab FZ |
86 | bdrv_op_unblock_all(bs, job->blocker); |
87 | error_free(job->blocker); | |
2f0c9fe6 | 88 | g_free(job); |
2f0c9fe6 PB |
89 | } |
90 | ||
91 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) | |
92 | { | |
93 | Error *local_err = NULL; | |
94 | ||
3fc4b10a | 95 | if (!job->driver->set_speed) { |
0b15abfc | 96 | error_set(errp, QERR_UNSUPPORTED); |
2f0c9fe6 PB |
97 | return; |
98 | } | |
3fc4b10a | 99 | job->driver->set_speed(job, speed, &local_err); |
84d18f06 | 100 | if (local_err) { |
2f0c9fe6 PB |
101 | error_propagate(errp, local_err); |
102 | return; | |
103 | } | |
104 | ||
105 | job->speed = speed; | |
106 | } | |
107 | ||
aeae883b PB |
108 | void block_job_complete(BlockJob *job, Error **errp) |
109 | { | |
3fc4b10a | 110 | if (job->paused || job->cancelled || !job->driver->complete) { |
aeae883b PB |
111 | error_set(errp, QERR_BLOCK_JOB_NOT_READY, job->bs->device_name); |
112 | return; | |
113 | } | |
114 | ||
3fc4b10a | 115 | job->driver->complete(job, errp); |
aeae883b PB |
116 | } |
117 | ||
8acc72a4 | 118 | void block_job_pause(BlockJob *job) |
2f0c9fe6 | 119 | { |
8acc72a4 PB |
120 | job->paused = true; |
121 | } | |
122 | ||
123 | bool block_job_is_paused(BlockJob *job) | |
124 | { | |
125 | return job->paused; | |
126 | } | |
127 | ||
128 | void block_job_resume(BlockJob *job) | |
129 | { | |
130 | job->paused = false; | |
32c81a4a | 131 | block_job_iostatus_reset(job); |
2f0c9fe6 PB |
132 | if (job->co && !job->busy) { |
133 | qemu_coroutine_enter(job->co, NULL); | |
134 | } | |
135 | } | |
136 | ||
8acc72a4 PB |
137 | void block_job_cancel(BlockJob *job) |
138 | { | |
139 | job->cancelled = true; | |
140 | block_job_resume(job); | |
141 | } | |
142 | ||
2f0c9fe6 PB |
143 | bool block_job_is_cancelled(BlockJob *job) |
144 | { | |
145 | return job->cancelled; | |
146 | } | |
147 | ||
32c81a4a PB |
148 | void block_job_iostatus_reset(BlockJob *job) |
149 | { | |
150 | job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
3fc4b10a FZ |
151 | if (job->driver->iostatus_reset) { |
152 | job->driver->iostatus_reset(job); | |
3bd293c3 | 153 | } |
32c81a4a PB |
154 | } |
155 | ||
2f0c9fe6 PB |
156 | struct BlockCancelData { |
157 | BlockJob *job; | |
158 | BlockDriverCompletionFunc *cb; | |
159 | void *opaque; | |
160 | bool cancelled; | |
161 | int ret; | |
162 | }; | |
163 | ||
164 | static void block_job_cancel_cb(void *opaque, int ret) | |
165 | { | |
166 | struct BlockCancelData *data = opaque; | |
167 | ||
168 | data->cancelled = block_job_is_cancelled(data->job); | |
169 | data->ret = ret; | |
170 | data->cb(data->opaque, ret); | |
171 | } | |
172 | ||
173 | int block_job_cancel_sync(BlockJob *job) | |
174 | { | |
175 | struct BlockCancelData data; | |
176 | BlockDriverState *bs = job->bs; | |
177 | ||
178 | assert(bs->job == job); | |
179 | ||
180 | /* Set up our own callback to store the result and chain to | |
181 | * the original callback. | |
182 | */ | |
183 | data.job = job; | |
184 | data.cb = job->cb; | |
185 | data.opaque = job->opaque; | |
186 | data.ret = -EINPROGRESS; | |
187 | job->cb = block_job_cancel_cb; | |
188 | job->opaque = &data; | |
189 | block_job_cancel(job); | |
190 | while (data.ret == -EINPROGRESS) { | |
191 | qemu_aio_wait(); | |
192 | } | |
193 | return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret; | |
194 | } | |
195 | ||
7483d1e5 | 196 | void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns) |
2f0c9fe6 | 197 | { |
8acc72a4 PB |
198 | assert(job->busy); |
199 | ||
2f0c9fe6 | 200 | /* Check cancellation *before* setting busy = false, too! */ |
8acc72a4 PB |
201 | if (block_job_is_cancelled(job)) { |
202 | return; | |
203 | } | |
204 | ||
205 | job->busy = false; | |
206 | if (block_job_is_paused(job)) { | |
207 | qemu_coroutine_yield(); | |
208 | } else { | |
7483d1e5 | 209 | co_sleep_ns(type, ns); |
2f0c9fe6 | 210 | } |
8acc72a4 | 211 | job->busy = true; |
2f0c9fe6 | 212 | } |
30e628b7 PB |
213 | |
214 | BlockJobInfo *block_job_query(BlockJob *job) | |
215 | { | |
216 | BlockJobInfo *info = g_new0(BlockJobInfo, 1); | |
79e14bf7 | 217 | info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]); |
32c81a4a PB |
218 | info->device = g_strdup(bdrv_get_device_name(job->bs)); |
219 | info->len = job->len; | |
220 | info->busy = job->busy; | |
221 | info->paused = job->paused; | |
222 | info->offset = job->offset; | |
223 | info->speed = job->speed; | |
224 | info->io_status = job->iostatus; | |
30e628b7 PB |
225 | return info; |
226 | } | |
32c81a4a PB |
227 | |
228 | static void block_job_iostatus_set_err(BlockJob *job, int error) | |
229 | { | |
230 | if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
231 | job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
232 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
233 | } | |
234 | } | |
235 | ||
236 | ||
a66a2a36 PB |
237 | QObject *qobject_from_block_job(BlockJob *job) |
238 | { | |
239 | return qobject_from_jsonf("{ 'type': %s," | |
240 | "'device': %s," | |
241 | "'len': %" PRId64 "," | |
242 | "'offset': %" PRId64 "," | |
243 | "'speed': %" PRId64 " }", | |
79e14bf7 | 244 | BlockJobType_lookup[job->driver->job_type], |
a66a2a36 PB |
245 | bdrv_get_device_name(job->bs), |
246 | job->len, | |
247 | job->offset, | |
248 | job->speed); | |
249 | } | |
250 | ||
251 | void block_job_ready(BlockJob *job) | |
252 | { | |
253 | QObject *data = qobject_from_block_job(job); | |
254 | monitor_protocol_event(QEVENT_BLOCK_JOB_READY, data); | |
255 | qobject_decref(data); | |
256 | } | |
257 | ||
32c81a4a PB |
258 | BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs, |
259 | BlockdevOnError on_err, | |
260 | int is_read, int error) | |
261 | { | |
262 | BlockErrorAction action; | |
263 | ||
264 | switch (on_err) { | |
265 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
a589569f WX |
266 | action = (error == ENOSPC) ? |
267 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
32c81a4a PB |
268 | break; |
269 | case BLOCKDEV_ON_ERROR_STOP: | |
a589569f | 270 | action = BLOCK_ERROR_ACTION_STOP; |
32c81a4a PB |
271 | break; |
272 | case BLOCKDEV_ON_ERROR_REPORT: | |
a589569f | 273 | action = BLOCK_ERROR_ACTION_REPORT; |
32c81a4a PB |
274 | break; |
275 | case BLOCKDEV_ON_ERROR_IGNORE: | |
a589569f | 276 | action = BLOCK_ERROR_ACTION_IGNORE; |
32c81a4a PB |
277 | break; |
278 | default: | |
279 | abort(); | |
280 | } | |
5a2d2cbd WX |
281 | qapi_event_send_block_job_error(bdrv_get_device_name(bs), |
282 | is_read ? IO_OPERATION_TYPE_READ : | |
283 | IO_OPERATION_TYPE_WRITE, | |
284 | action, &error_abort); | |
a589569f | 285 | if (action == BLOCK_ERROR_ACTION_STOP) { |
32c81a4a PB |
286 | block_job_pause(job); |
287 | block_job_iostatus_set_err(job, error); | |
288 | if (bs != job->bs) { | |
289 | bdrv_iostatus_set_err(bs, error); | |
290 | } | |
291 | } | |
292 | return action; | |
293 | } |