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12c929bc KW |
1 | /* |
2 | * QMP command handlers specific to the system emulators | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * | |
6 | * This work is licensed under the terms of the GNU GPL, version 2 or | |
7 | * later. See the COPYING file in the top-level directory. | |
8 | * | |
9 | * This file incorporates work covered by the following copyright and | |
10 | * permission notice: | |
11 | * | |
12 | * Copyright (c) 2003-2008 Fabrice Bellard | |
13 | * | |
14 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
15 | * of this software and associated documentation files (the "Software"), to deal | |
16 | * in the Software without restriction, including without limitation the rights | |
17 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
18 | * copies of the Software, and to permit persons to whom the Software is | |
19 | * furnished to do so, subject to the following conditions: | |
20 | * | |
21 | * The above copyright notice and this permission notice shall be included in | |
22 | * all copies or substantial portions of the Software. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
25 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
26 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
27 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
28 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
29 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
30 | * THE SOFTWARE. | |
31 | */ | |
32 | ||
33 | #include "qemu/osdep.h" | |
34 | ||
35 | #include "qapi/error.h" | |
36 | #include "qapi/qapi-commands-block.h" | |
37 | #include "qapi/qmp/qdict.h" | |
38 | #include "sysemu/block-backend.h" | |
39 | #include "sysemu/blockdev.h" | |
40 | ||
41 | static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id, | |
42 | Error **errp) | |
43 | { | |
44 | BlockBackend *blk; | |
45 | ||
46 | if (!blk_name == !qdev_id) { | |
47 | error_setg(errp, "Need exactly one of 'device' and 'id'"); | |
48 | return NULL; | |
49 | } | |
50 | ||
51 | if (qdev_id) { | |
52 | blk = blk_by_qdev_id(qdev_id, errp); | |
53 | } else { | |
54 | blk = blk_by_name(blk_name); | |
55 | if (blk == NULL) { | |
56 | error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, | |
57 | "Device '%s' not found", blk_name); | |
58 | } | |
59 | } | |
60 | ||
61 | return blk; | |
62 | } | |
63 | ||
64 | /* | |
65 | * Attempt to open the tray of @device. | |
66 | * If @force, ignore its tray lock. | |
67 | * Else, if the tray is locked, don't open it, but ask the guest to open it. | |
68 | * On error, store an error through @errp and return -errno. | |
69 | * If @device does not exist, return -ENODEV. | |
70 | * If it has no removable media, return -ENOTSUP. | |
71 | * If it has no tray, return -ENOSYS. | |
72 | * If the guest was asked to open the tray, return -EINPROGRESS. | |
73 | * Else, return 0. | |
74 | */ | |
75 | static int do_open_tray(const char *blk_name, const char *qdev_id, | |
76 | bool force, Error **errp) | |
77 | { | |
78 | BlockBackend *blk; | |
79 | const char *device = qdev_id ?: blk_name; | |
80 | bool locked; | |
81 | ||
82 | blk = qmp_get_blk(blk_name, qdev_id, errp); | |
83 | if (!blk) { | |
84 | return -ENODEV; | |
85 | } | |
86 | ||
87 | if (!blk_dev_has_removable_media(blk)) { | |
88 | error_setg(errp, "Device '%s' is not removable", device); | |
89 | return -ENOTSUP; | |
90 | } | |
91 | ||
92 | if (!blk_dev_has_tray(blk)) { | |
93 | error_setg(errp, "Device '%s' does not have a tray", device); | |
94 | return -ENOSYS; | |
95 | } | |
96 | ||
97 | if (blk_dev_is_tray_open(blk)) { | |
98 | return 0; | |
99 | } | |
100 | ||
101 | locked = blk_dev_is_medium_locked(blk); | |
102 | if (locked) { | |
103 | blk_dev_eject_request(blk, force); | |
104 | } | |
105 | ||
106 | if (!locked || force) { | |
107 | blk_dev_change_media_cb(blk, false, &error_abort); | |
108 | } | |
109 | ||
110 | if (locked && !force) { | |
111 | error_setg(errp, "Device '%s' is locked and force was not specified, " | |
112 | "wait for tray to open and try again", device); | |
113 | return -EINPROGRESS; | |
114 | } | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | void qmp_blockdev_open_tray(bool has_device, const char *device, | |
120 | bool has_id, const char *id, | |
121 | bool has_force, bool force, | |
122 | Error **errp) | |
123 | { | |
124 | Error *local_err = NULL; | |
125 | int rc; | |
126 | ||
127 | if (!has_force) { | |
128 | force = false; | |
129 | } | |
130 | rc = do_open_tray(has_device ? device : NULL, | |
131 | has_id ? id : NULL, | |
132 | force, &local_err); | |
133 | if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { | |
134 | error_propagate(errp, local_err); | |
135 | return; | |
136 | } | |
137 | error_free(local_err); | |
138 | } | |
139 | ||
140 | void qmp_blockdev_close_tray(bool has_device, const char *device, | |
141 | bool has_id, const char *id, | |
142 | Error **errp) | |
143 | { | |
144 | BlockBackend *blk; | |
145 | Error *local_err = NULL; | |
146 | ||
147 | device = has_device ? device : NULL; | |
148 | id = has_id ? id : NULL; | |
149 | ||
150 | blk = qmp_get_blk(device, id, errp); | |
151 | if (!blk) { | |
152 | return; | |
153 | } | |
154 | ||
155 | if (!blk_dev_has_removable_media(blk)) { | |
156 | error_setg(errp, "Device '%s' is not removable", device ?: id); | |
157 | return; | |
158 | } | |
159 | ||
160 | if (!blk_dev_has_tray(blk)) { | |
161 | /* Ignore this command on tray-less devices */ | |
162 | return; | |
163 | } | |
164 | ||
165 | if (!blk_dev_is_tray_open(blk)) { | |
166 | return; | |
167 | } | |
168 | ||
169 | blk_dev_change_media_cb(blk, true, &local_err); | |
170 | if (local_err) { | |
171 | error_propagate(errp, local_err); | |
172 | return; | |
173 | } | |
174 | } | |
175 | ||
176 | static void blockdev_remove_medium(bool has_device, const char *device, | |
177 | bool has_id, const char *id, Error **errp) | |
178 | { | |
179 | BlockBackend *blk; | |
180 | BlockDriverState *bs; | |
181 | AioContext *aio_context; | |
182 | bool has_attached_device; | |
183 | ||
184 | device = has_device ? device : NULL; | |
185 | id = has_id ? id : NULL; | |
186 | ||
187 | blk = qmp_get_blk(device, id, errp); | |
188 | if (!blk) { | |
189 | return; | |
190 | } | |
191 | ||
192 | /* For BBs without a device, we can exchange the BDS tree at will */ | |
193 | has_attached_device = blk_get_attached_dev(blk); | |
194 | ||
195 | if (has_attached_device && !blk_dev_has_removable_media(blk)) { | |
196 | error_setg(errp, "Device '%s' is not removable", device ?: id); | |
197 | return; | |
198 | } | |
199 | ||
200 | if (has_attached_device && blk_dev_has_tray(blk) && | |
201 | !blk_dev_is_tray_open(blk)) | |
202 | { | |
203 | error_setg(errp, "Tray of device '%s' is not open", device ?: id); | |
204 | return; | |
205 | } | |
206 | ||
207 | bs = blk_bs(blk); | |
208 | if (!bs) { | |
209 | return; | |
210 | } | |
211 | ||
212 | aio_context = bdrv_get_aio_context(bs); | |
213 | aio_context_acquire(aio_context); | |
214 | ||
215 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { | |
216 | goto out; | |
217 | } | |
218 | ||
219 | blk_remove_bs(blk); | |
220 | ||
221 | if (!blk_dev_has_tray(blk)) { | |
222 | /* For tray-less devices, blockdev-open-tray is a no-op (or may not be | |
223 | * called at all); therefore, the medium needs to be ejected here. | |
224 | * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load | |
225 | * value passed here (i.e. false). */ | |
226 | blk_dev_change_media_cb(blk, false, &error_abort); | |
227 | } | |
228 | ||
229 | out: | |
230 | aio_context_release(aio_context); | |
231 | } | |
232 | ||
233 | void qmp_blockdev_remove_medium(const char *id, Error **errp) | |
234 | { | |
235 | blockdev_remove_medium(false, NULL, true, id, errp); | |
236 | } | |
237 | ||
238 | static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, | |
239 | BlockDriverState *bs, Error **errp) | |
240 | { | |
241 | Error *local_err = NULL; | |
242 | bool has_device; | |
243 | int ret; | |
244 | ||
245 | /* For BBs without a device, we can exchange the BDS tree at will */ | |
246 | has_device = blk_get_attached_dev(blk); | |
247 | ||
248 | if (has_device && !blk_dev_has_removable_media(blk)) { | |
249 | error_setg(errp, "Device is not removable"); | |
250 | return; | |
251 | } | |
252 | ||
253 | if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { | |
254 | error_setg(errp, "Tray of the device is not open"); | |
255 | return; | |
256 | } | |
257 | ||
258 | if (blk_bs(blk)) { | |
259 | error_setg(errp, "There already is a medium in the device"); | |
260 | return; | |
261 | } | |
262 | ||
263 | ret = blk_insert_bs(blk, bs, errp); | |
264 | if (ret < 0) { | |
265 | return; | |
266 | } | |
267 | ||
268 | if (!blk_dev_has_tray(blk)) { | |
269 | /* For tray-less devices, blockdev-close-tray is a no-op (or may not be | |
270 | * called at all); therefore, the medium needs to be pushed into the | |
271 | * slot here. | |
272 | * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load | |
273 | * value passed here (i.e. true). */ | |
274 | blk_dev_change_media_cb(blk, true, &local_err); | |
275 | if (local_err) { | |
276 | error_propagate(errp, local_err); | |
277 | blk_remove_bs(blk); | |
278 | return; | |
279 | } | |
280 | } | |
281 | } | |
282 | ||
283 | static void blockdev_insert_medium(bool has_device, const char *device, | |
284 | bool has_id, const char *id, | |
285 | const char *node_name, Error **errp) | |
286 | { | |
287 | BlockBackend *blk; | |
288 | BlockDriverState *bs; | |
289 | ||
290 | blk = qmp_get_blk(has_device ? device : NULL, | |
291 | has_id ? id : NULL, | |
292 | errp); | |
293 | if (!blk) { | |
294 | return; | |
295 | } | |
296 | ||
297 | bs = bdrv_find_node(node_name); | |
298 | if (!bs) { | |
299 | error_setg(errp, "Node '%s' not found", node_name); | |
300 | return; | |
301 | } | |
302 | ||
303 | if (bdrv_has_blk(bs)) { | |
304 | error_setg(errp, "Node '%s' is already in use", node_name); | |
305 | return; | |
306 | } | |
307 | ||
308 | qmp_blockdev_insert_anon_medium(blk, bs, errp); | |
309 | } | |
310 | ||
311 | void qmp_blockdev_insert_medium(const char *id, const char *node_name, | |
312 | Error **errp) | |
313 | { | |
314 | blockdev_insert_medium(false, NULL, true, id, node_name, errp); | |
315 | } | |
316 | ||
317 | void qmp_blockdev_change_medium(bool has_device, const char *device, | |
318 | bool has_id, const char *id, | |
319 | const char *filename, | |
320 | bool has_format, const char *format, | |
321 | bool has_read_only, | |
322 | BlockdevChangeReadOnlyMode read_only, | |
323 | Error **errp) | |
324 | { | |
325 | BlockBackend *blk; | |
326 | BlockDriverState *medium_bs = NULL; | |
327 | int bdrv_flags; | |
328 | bool detect_zeroes; | |
329 | int rc; | |
330 | QDict *options = NULL; | |
331 | Error *err = NULL; | |
332 | ||
333 | blk = qmp_get_blk(has_device ? device : NULL, | |
334 | has_id ? id : NULL, | |
335 | errp); | |
336 | if (!blk) { | |
337 | goto fail; | |
338 | } | |
339 | ||
340 | if (blk_bs(blk)) { | |
341 | blk_update_root_state(blk); | |
342 | } | |
343 | ||
344 | bdrv_flags = blk_get_open_flags_from_root_state(blk); | |
345 | bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | | |
346 | BDRV_O_PROTOCOL | BDRV_O_AUTO_RDONLY); | |
347 | ||
348 | if (!has_read_only) { | |
349 | read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; | |
350 | } | |
351 | ||
352 | switch (read_only) { | |
353 | case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: | |
354 | break; | |
355 | ||
356 | case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: | |
357 | bdrv_flags &= ~BDRV_O_RDWR; | |
358 | break; | |
359 | ||
360 | case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: | |
361 | bdrv_flags |= BDRV_O_RDWR; | |
362 | break; | |
363 | ||
364 | default: | |
365 | abort(); | |
366 | } | |
367 | ||
368 | options = qdict_new(); | |
369 | detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); | |
370 | qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); | |
371 | ||
372 | if (has_format) { | |
373 | qdict_put_str(options, "driver", format); | |
374 | } | |
375 | ||
376 | medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); | |
377 | if (!medium_bs) { | |
378 | goto fail; | |
379 | } | |
380 | ||
381 | rc = do_open_tray(has_device ? device : NULL, | |
382 | has_id ? id : NULL, | |
383 | false, &err); | |
384 | if (rc && rc != -ENOSYS) { | |
385 | error_propagate(errp, err); | |
386 | goto fail; | |
387 | } | |
388 | error_free(err); | |
389 | err = NULL; | |
390 | ||
391 | blockdev_remove_medium(has_device, device, has_id, id, &err); | |
392 | if (err) { | |
393 | error_propagate(errp, err); | |
394 | goto fail; | |
395 | } | |
396 | ||
397 | qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); | |
398 | if (err) { | |
399 | error_propagate(errp, err); | |
400 | goto fail; | |
401 | } | |
402 | ||
403 | qmp_blockdev_close_tray(has_device, device, has_id, id, errp); | |
404 | ||
405 | fail: | |
406 | /* If the medium has been inserted, the device has its own reference, so | |
407 | * ours must be relinquished; and if it has not been inserted successfully, | |
408 | * the reference must be relinquished anyway */ | |
409 | bdrv_unref(medium_bs); | |
410 | } | |
411 | ||
412 | void qmp_eject(bool has_device, const char *device, | |
413 | bool has_id, const char *id, | |
414 | bool has_force, bool force, Error **errp) | |
415 | { | |
416 | Error *local_err = NULL; | |
417 | int rc; | |
418 | ||
419 | if (!has_force) { | |
420 | force = false; | |
421 | } | |
422 | ||
423 | rc = do_open_tray(has_device ? device : NULL, | |
424 | has_id ? id : NULL, | |
425 | force, &local_err); | |
426 | if (rc && rc != -ENOSYS) { | |
427 | error_propagate(errp, local_err); | |
428 | return; | |
429 | } | |
430 | error_free(local_err); | |
431 | ||
432 | blockdev_remove_medium(has_device, device, has_id, id, errp); | |
433 | } | |
434 | ||
435 | /* throttling disk I/O limits */ | |
436 | void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) | |
437 | { | |
438 | ThrottleConfig cfg; | |
439 | BlockDriverState *bs; | |
440 | BlockBackend *blk; | |
441 | AioContext *aio_context; | |
442 | ||
443 | blk = qmp_get_blk(arg->has_device ? arg->device : NULL, | |
444 | arg->has_id ? arg->id : NULL, | |
445 | errp); | |
446 | if (!blk) { | |
447 | return; | |
448 | } | |
449 | ||
450 | aio_context = blk_get_aio_context(blk); | |
451 | aio_context_acquire(aio_context); | |
452 | ||
453 | bs = blk_bs(blk); | |
454 | if (!bs) { | |
455 | error_setg(errp, "Device has no medium"); | |
456 | goto out; | |
457 | } | |
458 | ||
459 | throttle_config_init(&cfg); | |
460 | cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; | |
461 | cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; | |
462 | cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; | |
463 | ||
464 | cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; | |
465 | cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; | |
466 | cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; | |
467 | ||
468 | if (arg->has_bps_max) { | |
469 | cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; | |
470 | } | |
471 | if (arg->has_bps_rd_max) { | |
472 | cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; | |
473 | } | |
474 | if (arg->has_bps_wr_max) { | |
475 | cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; | |
476 | } | |
477 | if (arg->has_iops_max) { | |
478 | cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; | |
479 | } | |
480 | if (arg->has_iops_rd_max) { | |
481 | cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; | |
482 | } | |
483 | if (arg->has_iops_wr_max) { | |
484 | cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; | |
485 | } | |
486 | ||
487 | if (arg->has_bps_max_length) { | |
488 | cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; | |
489 | } | |
490 | if (arg->has_bps_rd_max_length) { | |
491 | cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; | |
492 | } | |
493 | if (arg->has_bps_wr_max_length) { | |
494 | cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; | |
495 | } | |
496 | if (arg->has_iops_max_length) { | |
497 | cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; | |
498 | } | |
499 | if (arg->has_iops_rd_max_length) { | |
500 | cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; | |
501 | } | |
502 | if (arg->has_iops_wr_max_length) { | |
503 | cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; | |
504 | } | |
505 | ||
506 | if (arg->has_iops_size) { | |
507 | cfg.op_size = arg->iops_size; | |
508 | } | |
509 | ||
510 | if (!throttle_is_valid(&cfg, errp)) { | |
511 | goto out; | |
512 | } | |
513 | ||
514 | if (throttle_enabled(&cfg)) { | |
515 | /* Enable I/O limits if they're not enabled yet, otherwise | |
516 | * just update the throttling group. */ | |
517 | if (!blk_get_public(blk)->throttle_group_member.throttle_state) { | |
518 | blk_io_limits_enable(blk, | |
519 | arg->has_group ? arg->group : | |
520 | arg->has_device ? arg->device : | |
521 | arg->id); | |
522 | } else if (arg->has_group) { | |
523 | blk_io_limits_update_group(blk, arg->group); | |
524 | } | |
525 | /* Set the new throttling configuration */ | |
526 | blk_set_io_limits(blk, &cfg); | |
527 | } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { | |
528 | /* If all throttling settings are set to 0, disable I/O limits */ | |
529 | blk_io_limits_disable(blk); | |
530 | } | |
531 | ||
532 | out: | |
533 | aio_context_release(aio_context); | |
534 | } | |
535 | ||
536 | void qmp_block_latency_histogram_set( | |
537 | const char *id, | |
538 | bool has_boundaries, uint64List *boundaries, | |
539 | bool has_boundaries_read, uint64List *boundaries_read, | |
540 | bool has_boundaries_write, uint64List *boundaries_write, | |
541 | bool has_boundaries_flush, uint64List *boundaries_flush, | |
542 | Error **errp) | |
543 | { | |
544 | BlockBackend *blk = qmp_get_blk(NULL, id, errp); | |
545 | BlockAcctStats *stats; | |
546 | int ret; | |
547 | ||
548 | if (!blk) { | |
549 | return; | |
550 | } | |
551 | ||
552 | stats = blk_get_stats(blk); | |
553 | ||
554 | if (!has_boundaries && !has_boundaries_read && !has_boundaries_write && | |
555 | !has_boundaries_flush) | |
556 | { | |
557 | block_latency_histograms_clear(stats); | |
558 | return; | |
559 | } | |
560 | ||
561 | if (has_boundaries || has_boundaries_read) { | |
562 | ret = block_latency_histogram_set( | |
563 | stats, BLOCK_ACCT_READ, | |
564 | has_boundaries_read ? boundaries_read : boundaries); | |
565 | if (ret) { | |
566 | error_setg(errp, "Device '%s' set read boundaries fail", id); | |
567 | return; | |
568 | } | |
569 | } | |
570 | ||
571 | if (has_boundaries || has_boundaries_write) { | |
572 | ret = block_latency_histogram_set( | |
573 | stats, BLOCK_ACCT_WRITE, | |
574 | has_boundaries_write ? boundaries_write : boundaries); | |
575 | if (ret) { | |
576 | error_setg(errp, "Device '%s' set write boundaries fail", id); | |
577 | return; | |
578 | } | |
579 | } | |
580 | ||
581 | if (has_boundaries || has_boundaries_flush) { | |
582 | ret = block_latency_histogram_set( | |
583 | stats, BLOCK_ACCT_FLUSH, | |
584 | has_boundaries_flush ? boundaries_flush : boundaries); | |
585 | if (ret) { | |
586 | error_setg(errp, "Device '%s' set flush boundaries fail", id); | |
587 | return; | |
588 | } | |
589 | } | |
590 | } |