]> git.proxmox.com Git - mirror_qemu.git/blame - blockjob.c
configure: disable Archipelago by default and warn about libxseg GPLv3 license
[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"
737e150e
PB
29#include "block/block.h"
30#include "block/blockjob.h"
31#include "block/block_int.h"
7b1b5d19 32#include "qapi/qmp/qjson.h"
737e150e 33#include "block/coroutine.h"
2f0c9fe6 34#include "qmp-commands.h"
1de7afc9 35#include "qemu/timer.h"
5a2d2cbd 36#include "qapi-event.h"
2f0c9fe6 37
3fc4b10a 38void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
097310b5 39 int64_t speed, BlockCompletionFunc *cb,
2f0c9fe6
PB
40 void *opaque, Error **errp)
41{
42 BlockJob *job;
43
628ff683 44 if (bs->job) {
2f0c9fe6
PB
45 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
46 return NULL;
47 }
fa510ebf 48 bdrv_ref(bs);
3fc4b10a 49 job = g_malloc0(driver->instance_size);
3718d8ab
FZ
50 error_setg(&job->blocker, "block device is in use by block job: %s",
51 BlockJobType_lookup[driver->job_type]);
52 bdrv_op_block_all(bs, job->blocker);
b112a65c 53 bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
3718d8ab 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 79void 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
91void 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
108void block_job_complete(BlockJob *job, Error **errp)
109{
3fc4b10a 110 if (job->paused || job->cancelled || !job->driver->complete) {
bfb197e0
MA
111 error_set(errp, QERR_BLOCK_JOB_NOT_READY,
112 bdrv_get_device_name(job->bs));
aeae883b
PB
113 return;
114 }
115
3fc4b10a 116 job->driver->complete(job, errp);
aeae883b
PB
117}
118
8acc72a4 119void block_job_pause(BlockJob *job)
2f0c9fe6 120{
8acc72a4
PB
121 job->paused = true;
122}
123
124bool block_job_is_paused(BlockJob *job)
125{
126 return job->paused;
127}
128
129void block_job_resume(BlockJob *job)
130{
131 job->paused = false;
32c81a4a 132 block_job_iostatus_reset(job);
2f0c9fe6
PB
133 if (job->co && !job->busy) {
134 qemu_coroutine_enter(job->co, NULL);
135 }
136}
137
8acc72a4
PB
138void block_job_cancel(BlockJob *job)
139{
140 job->cancelled = true;
141 block_job_resume(job);
142}
143
2f0c9fe6
PB
144bool block_job_is_cancelled(BlockJob *job)
145{
146 return job->cancelled;
147}
148
32c81a4a
PB
149void block_job_iostatus_reset(BlockJob *job)
150{
151 job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
3fc4b10a
FZ
152 if (job->driver->iostatus_reset) {
153 job->driver->iostatus_reset(job);
3bd293c3 154 }
32c81a4a
PB
155}
156
345f9e1b 157struct BlockFinishData {
2f0c9fe6 158 BlockJob *job;
097310b5 159 BlockCompletionFunc *cb;
2f0c9fe6
PB
160 void *opaque;
161 bool cancelled;
162 int ret;
163};
164
345f9e1b 165static void block_job_finish_cb(void *opaque, int ret)
2f0c9fe6 166{
345f9e1b 167 struct BlockFinishData *data = opaque;
2f0c9fe6
PB
168
169 data->cancelled = block_job_is_cancelled(data->job);
170 data->ret = ret;
171 data->cb(data->opaque, ret);
172}
173
345f9e1b
HR
174static int block_job_finish_sync(BlockJob *job,
175 void (*finish)(BlockJob *, Error **errp),
176 Error **errp)
2f0c9fe6 177{
345f9e1b 178 struct BlockFinishData data;
2f0c9fe6 179 BlockDriverState *bs = job->bs;
345f9e1b 180 Error *local_err = NULL;
2f0c9fe6
PB
181
182 assert(bs->job == job);
183
184 /* Set up our own callback to store the result and chain to
185 * the original callback.
186 */
187 data.job = job;
188 data.cb = job->cb;
189 data.opaque = job->opaque;
190 data.ret = -EINPROGRESS;
345f9e1b 191 job->cb = block_job_finish_cb;
2f0c9fe6 192 job->opaque = &data;
345f9e1b
HR
193 finish(job, &local_err);
194 if (local_err) {
195 error_propagate(errp, local_err);
196 return -EBUSY;
197 }
2f0c9fe6 198 while (data.ret == -EINPROGRESS) {
b47ec2c4 199 aio_poll(bdrv_get_aio_context(bs), true);
2f0c9fe6
PB
200 }
201 return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret;
202}
203
345f9e1b
HR
204/* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
205 * used with block_job_finish_sync() without the need for (rather nasty)
206 * function pointer casts there. */
207static void block_job_cancel_err(BlockJob *job, Error **errp)
208{
209 block_job_cancel(job);
210}
211
212int block_job_cancel_sync(BlockJob *job)
213{
214 return block_job_finish_sync(job, &block_job_cancel_err, NULL);
215}
216
217int block_job_complete_sync(BlockJob *job, Error **errp)
218{
219 return block_job_finish_sync(job, &block_job_complete, errp);
220}
221
7483d1e5 222void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
2f0c9fe6 223{
8acc72a4
PB
224 assert(job->busy);
225
2f0c9fe6 226 /* Check cancellation *before* setting busy = false, too! */
8acc72a4
PB
227 if (block_job_is_cancelled(job)) {
228 return;
229 }
230
231 job->busy = false;
232 if (block_job_is_paused(job)) {
233 qemu_coroutine_yield();
234 } else {
0b9caf9b 235 co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns);
2f0c9fe6 236 }
8acc72a4 237 job->busy = true;
2f0c9fe6 238}
30e628b7 239
dc71ce45
FZ
240void block_job_yield(BlockJob *job)
241{
242 assert(job->busy);
243
244 /* Check cancellation *before* setting busy = false, too! */
245 if (block_job_is_cancelled(job)) {
246 return;
247 }
248
249 job->busy = false;
250 qemu_coroutine_yield();
251 job->busy = true;
252}
253
30e628b7
PB
254BlockJobInfo *block_job_query(BlockJob *job)
255{
256 BlockJobInfo *info = g_new0(BlockJobInfo, 1);
79e14bf7 257 info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]);
32c81a4a
PB
258 info->device = g_strdup(bdrv_get_device_name(job->bs));
259 info->len = job->len;
260 info->busy = job->busy;
261 info->paused = job->paused;
262 info->offset = job->offset;
263 info->speed = job->speed;
264 info->io_status = job->iostatus;
ef6dbf1e 265 info->ready = job->ready;
30e628b7
PB
266 return info;
267}
32c81a4a
PB
268
269static void block_job_iostatus_set_err(BlockJob *job, int error)
270{
271 if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
272 job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
273 BLOCK_DEVICE_IO_STATUS_FAILED;
274 }
275}
276
bcada37b
WX
277void block_job_event_cancelled(BlockJob *job)
278{
279 qapi_event_send_block_job_cancelled(job->driver->job_type,
280 bdrv_get_device_name(job->bs),
281 job->len,
282 job->offset,
283 job->speed,
284 &error_abort);
285}
32c81a4a 286
bcada37b 287void block_job_event_completed(BlockJob *job, const char *msg)
a66a2a36 288{
bcada37b
WX
289 qapi_event_send_block_job_completed(job->driver->job_type,
290 bdrv_get_device_name(job->bs),
291 job->len,
292 job->offset,
293 job->speed,
294 !!msg,
295 msg,
296 &error_abort);
a66a2a36
PB
297}
298
bcada37b 299void block_job_event_ready(BlockJob *job)
a66a2a36 300{
ef6dbf1e
HR
301 job->ready = true;
302
518848a2
MA
303 qapi_event_send_block_job_ready(job->driver->job_type,
304 bdrv_get_device_name(job->bs),
305 job->len,
306 job->offset,
307 job->speed, &error_abort);
a66a2a36
PB
308}
309
32c81a4a
PB
310BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs,
311 BlockdevOnError on_err,
312 int is_read, int error)
313{
314 BlockErrorAction action;
315
316 switch (on_err) {
317 case BLOCKDEV_ON_ERROR_ENOSPC:
a589569f
WX
318 action = (error == ENOSPC) ?
319 BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
32c81a4a
PB
320 break;
321 case BLOCKDEV_ON_ERROR_STOP:
a589569f 322 action = BLOCK_ERROR_ACTION_STOP;
32c81a4a
PB
323 break;
324 case BLOCKDEV_ON_ERROR_REPORT:
a589569f 325 action = BLOCK_ERROR_ACTION_REPORT;
32c81a4a
PB
326 break;
327 case BLOCKDEV_ON_ERROR_IGNORE:
a589569f 328 action = BLOCK_ERROR_ACTION_IGNORE;
32c81a4a
PB
329 break;
330 default:
331 abort();
332 }
823c6863 333 qapi_event_send_block_job_error(bdrv_get_device_name(job->bs),
5a2d2cbd
WX
334 is_read ? IO_OPERATION_TYPE_READ :
335 IO_OPERATION_TYPE_WRITE,
336 action, &error_abort);
a589569f 337 if (action == BLOCK_ERROR_ACTION_STOP) {
32c81a4a
PB
338 block_job_pause(job);
339 block_job_iostatus_set_err(job, error);
340 if (bs != job->bs) {
341 bdrv_iostatus_set_err(bs, error);
342 }
343 }
344 return action;
345}
dec7d421
SH
346
347typedef struct {
348 BlockJob *job;
349 QEMUBH *bh;
350 AioContext *aio_context;
351 BlockJobDeferToMainLoopFn *fn;
352 void *opaque;
353} BlockJobDeferToMainLoopData;
354
355static void block_job_defer_to_main_loop_bh(void *opaque)
356{
357 BlockJobDeferToMainLoopData *data = opaque;
358 AioContext *aio_context;
359
360 qemu_bh_delete(data->bh);
361
362 /* Prevent race with block_job_defer_to_main_loop() */
363 aio_context_acquire(data->aio_context);
364
365 /* Fetch BDS AioContext again, in case it has changed */
366 aio_context = bdrv_get_aio_context(data->job->bs);
367 aio_context_acquire(aio_context);
368
369 data->fn(data->job, data->opaque);
370
371 aio_context_release(aio_context);
372
373 aio_context_release(data->aio_context);
374
375 g_free(data);
376}
377
378void block_job_defer_to_main_loop(BlockJob *job,
379 BlockJobDeferToMainLoopFn *fn,
380 void *opaque)
381{
382 BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data));
383 data->job = job;
384 data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data);
385 data->aio_context = bdrv_get_aio_context(job->bs);
386 data->fn = fn;
387 data->opaque = opaque;
388
389 qemu_bh_schedule(data->bh);
390}