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1 | /* | |
2 | * QEMU host block devices | |
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 | #include "sysemu/block-backend.h" | |
35 | #include "sysemu/blockdev.h" | |
36 | #include "hw/block/block.h" | |
37 | #include "block/blockjob.h" | |
38 | #include "block/qdict.h" | |
39 | #include "block/throttle-groups.h" | |
40 | #include "monitor/monitor.h" | |
41 | #include "qemu/error-report.h" | |
42 | #include "qemu/option.h" | |
43 | #include "qemu/qemu-print.h" | |
44 | #include "qemu/config-file.h" | |
45 | #include "qapi/qapi-commands-block.h" | |
46 | #include "qapi/qapi-commands-transaction.h" | |
47 | #include "qapi/qapi-visit-block-core.h" | |
48 | #include "qapi/qmp/qdict.h" | |
49 | #include "qapi/qmp/qnum.h" | |
50 | #include "qapi/qmp/qstring.h" | |
51 | #include "qapi/error.h" | |
52 | #include "qapi/qmp/qerror.h" | |
53 | #include "qapi/qmp/qlist.h" | |
54 | #include "qapi/qobject-output-visitor.h" | |
55 | #include "sysemu/sysemu.h" | |
56 | #include "sysemu/iothread.h" | |
57 | #include "block/block_int.h" | |
58 | #include "block/trace.h" | |
59 | #include "sysemu/runstate.h" | |
60 | #include "sysemu/replay.h" | |
61 | #include "qemu/cutils.h" | |
62 | #include "qemu/help_option.h" | |
63 | #include "qemu/main-loop.h" | |
64 | #include "qemu/throttle-options.h" | |
65 | ||
66 | /* Protected by BQL */ | |
67 | QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = | |
68 | QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); | |
69 | ||
70 | void bdrv_set_monitor_owned(BlockDriverState *bs) | |
71 | { | |
72 | GLOBAL_STATE_CODE(); | |
73 | QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); | |
74 | } | |
75 | ||
76 | static const char *const if_name[IF_COUNT] = { | |
77 | [IF_NONE] = "none", | |
78 | [IF_IDE] = "ide", | |
79 | [IF_SCSI] = "scsi", | |
80 | [IF_FLOPPY] = "floppy", | |
81 | [IF_PFLASH] = "pflash", | |
82 | [IF_MTD] = "mtd", | |
83 | [IF_SD] = "sd", | |
84 | [IF_VIRTIO] = "virtio", | |
85 | [IF_XEN] = "xen", | |
86 | }; | |
87 | ||
88 | static int if_max_devs[IF_COUNT] = { | |
89 | /* | |
90 | * Do not change these numbers! They govern how drive option | |
91 | * index maps to unit and bus. That mapping is ABI. | |
92 | * | |
93 | * All controllers used to implement if=T drives need to support | |
94 | * if_max_devs[T] units, for any T with if_max_devs[T] != 0. | |
95 | * Otherwise, some index values map to "impossible" bus, unit | |
96 | * values. | |
97 | * | |
98 | * For instance, if you change [IF_SCSI] to 255, -drive | |
99 | * if=scsi,index=12 no longer means bus=1,unit=5, but | |
100 | * bus=0,unit=12. With an lsi53c895a controller (7 units max), | |
101 | * the drive can't be set up. Regression. | |
102 | */ | |
103 | [IF_IDE] = 2, | |
104 | [IF_SCSI] = 7, | |
105 | }; | |
106 | ||
107 | /** | |
108 | * Boards may call this to offer board-by-board overrides | |
109 | * of the default, global values. | |
110 | */ | |
111 | void override_max_devs(BlockInterfaceType type, int max_devs) | |
112 | { | |
113 | BlockBackend *blk; | |
114 | DriveInfo *dinfo; | |
115 | ||
116 | GLOBAL_STATE_CODE(); | |
117 | ||
118 | if (max_devs <= 0) { | |
119 | return; | |
120 | } | |
121 | ||
122 | for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
123 | dinfo = blk_legacy_dinfo(blk); | |
124 | if (dinfo->type == type) { | |
125 | fprintf(stderr, "Cannot override units-per-bus property of" | |
126 | " the %s interface, because a drive of that type has" | |
127 | " already been added.\n", if_name[type]); | |
128 | g_assert_not_reached(); | |
129 | } | |
130 | } | |
131 | ||
132 | if_max_devs[type] = max_devs; | |
133 | } | |
134 | ||
135 | /* | |
136 | * We automatically delete the drive when a device using it gets | |
137 | * unplugged. Questionable feature, but we can't just drop it. | |
138 | * Device models call blockdev_mark_auto_del() to schedule the | |
139 | * automatic deletion, and generic qdev code calls blockdev_auto_del() | |
140 | * when deletion is actually safe. | |
141 | */ | |
142 | void blockdev_mark_auto_del(BlockBackend *blk) | |
143 | { | |
144 | DriveInfo *dinfo = blk_legacy_dinfo(blk); | |
145 | BlockJob *job; | |
146 | ||
147 | GLOBAL_STATE_CODE(); | |
148 | ||
149 | if (!dinfo) { | |
150 | return; | |
151 | } | |
152 | ||
153 | JOB_LOCK_GUARD(); | |
154 | ||
155 | for (job = block_job_next_locked(NULL); job; | |
156 | job = block_job_next_locked(job)) { | |
157 | if (block_job_has_bdrv(job, blk_bs(blk))) { | |
158 | job_cancel_locked(&job->job, false); | |
159 | } | |
160 | } | |
161 | ||
162 | dinfo->auto_del = 1; | |
163 | } | |
164 | ||
165 | void blockdev_auto_del(BlockBackend *blk) | |
166 | { | |
167 | DriveInfo *dinfo = blk_legacy_dinfo(blk); | |
168 | GLOBAL_STATE_CODE(); | |
169 | ||
170 | if (dinfo && dinfo->auto_del) { | |
171 | monitor_remove_blk(blk); | |
172 | blk_unref(blk); | |
173 | } | |
174 | } | |
175 | ||
176 | static int drive_index_to_bus_id(BlockInterfaceType type, int index) | |
177 | { | |
178 | int max_devs = if_max_devs[type]; | |
179 | return max_devs ? index / max_devs : 0; | |
180 | } | |
181 | ||
182 | static int drive_index_to_unit_id(BlockInterfaceType type, int index) | |
183 | { | |
184 | int max_devs = if_max_devs[type]; | |
185 | return max_devs ? index % max_devs : index; | |
186 | } | |
187 | ||
188 | QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, | |
189 | const char *optstr) | |
190 | { | |
191 | QemuOpts *opts; | |
192 | ||
193 | GLOBAL_STATE_CODE(); | |
194 | ||
195 | opts = qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); | |
196 | if (!opts) { | |
197 | return NULL; | |
198 | } | |
199 | if (type != IF_DEFAULT) { | |
200 | qemu_opt_set(opts, "if", if_name[type], &error_abort); | |
201 | } | |
202 | if (index >= 0) { | |
203 | qemu_opt_set_number(opts, "index", index, &error_abort); | |
204 | } | |
205 | if (file) | |
206 | qemu_opt_set(opts, "file", file, &error_abort); | |
207 | return opts; | |
208 | } | |
209 | ||
210 | DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) | |
211 | { | |
212 | BlockBackend *blk; | |
213 | DriveInfo *dinfo; | |
214 | ||
215 | GLOBAL_STATE_CODE(); | |
216 | ||
217 | for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
218 | dinfo = blk_legacy_dinfo(blk); | |
219 | if (dinfo && dinfo->type == type | |
220 | && dinfo->bus == bus && dinfo->unit == unit) { | |
221 | return dinfo; | |
222 | } | |
223 | } | |
224 | ||
225 | return NULL; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Check board claimed all -drive that are meant to be claimed. | |
230 | * Fatal error if any remain unclaimed. | |
231 | */ | |
232 | void drive_check_orphaned(void) | |
233 | { | |
234 | BlockBackend *blk; | |
235 | DriveInfo *dinfo; | |
236 | Location loc; | |
237 | bool orphans = false; | |
238 | ||
239 | GLOBAL_STATE_CODE(); | |
240 | ||
241 | for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
242 | dinfo = blk_legacy_dinfo(blk); | |
243 | /* | |
244 | * Ignore default drives, because we create certain default | |
245 | * drives unconditionally, then leave them unclaimed. Not the | |
246 | * users fault. | |
247 | * Ignore IF_VIRTIO, because it gets desugared into -device, | |
248 | * so we can leave failing to -device. | |
249 | * Ignore IF_NONE, because leaving unclaimed IF_NONE remains | |
250 | * available for device_add is a feature. | |
251 | */ | |
252 | if (dinfo->is_default || dinfo->type == IF_VIRTIO | |
253 | || dinfo->type == IF_NONE) { | |
254 | continue; | |
255 | } | |
256 | if (!blk_get_attached_dev(blk)) { | |
257 | loc_push_none(&loc); | |
258 | qemu_opts_loc_restore(dinfo->opts); | |
259 | error_report("machine type does not support" | |
260 | " if=%s,bus=%d,unit=%d", | |
261 | if_name[dinfo->type], dinfo->bus, dinfo->unit); | |
262 | loc_pop(&loc); | |
263 | orphans = true; | |
264 | } | |
265 | } | |
266 | ||
267 | if (orphans) { | |
268 | exit(1); | |
269 | } | |
270 | } | |
271 | ||
272 | DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) | |
273 | { | |
274 | GLOBAL_STATE_CODE(); | |
275 | return drive_get(type, | |
276 | drive_index_to_bus_id(type, index), | |
277 | drive_index_to_unit_id(type, index)); | |
278 | } | |
279 | ||
280 | int drive_get_max_bus(BlockInterfaceType type) | |
281 | { | |
282 | int max_bus; | |
283 | BlockBackend *blk; | |
284 | DriveInfo *dinfo; | |
285 | ||
286 | GLOBAL_STATE_CODE(); | |
287 | ||
288 | max_bus = -1; | |
289 | for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
290 | dinfo = blk_legacy_dinfo(blk); | |
291 | if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { | |
292 | max_bus = dinfo->bus; | |
293 | } | |
294 | } | |
295 | return max_bus; | |
296 | } | |
297 | ||
298 | static void bdrv_format_print(void *opaque, const char *name) | |
299 | { | |
300 | qemu_printf(" %s", name); | |
301 | } | |
302 | ||
303 | typedef struct { | |
304 | QEMUBH *bh; | |
305 | BlockDriverState *bs; | |
306 | } BDRVPutRefBH; | |
307 | ||
308 | static int parse_block_error_action(const char *buf, bool is_read, Error **errp) | |
309 | { | |
310 | if (!strcmp(buf, "ignore")) { | |
311 | return BLOCKDEV_ON_ERROR_IGNORE; | |
312 | } else if (!is_read && !strcmp(buf, "enospc")) { | |
313 | return BLOCKDEV_ON_ERROR_ENOSPC; | |
314 | } else if (!strcmp(buf, "stop")) { | |
315 | return BLOCKDEV_ON_ERROR_STOP; | |
316 | } else if (!strcmp(buf, "report")) { | |
317 | return BLOCKDEV_ON_ERROR_REPORT; | |
318 | } else { | |
319 | error_setg(errp, "'%s' invalid %s error action", | |
320 | buf, is_read ? "read" : "write"); | |
321 | return -1; | |
322 | } | |
323 | } | |
324 | ||
325 | static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, | |
326 | Error **errp) | |
327 | { | |
328 | const QListEntry *entry; | |
329 | for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { | |
330 | switch (qobject_type(entry->value)) { | |
331 | ||
332 | case QTYPE_QSTRING: { | |
333 | unsigned long long length; | |
334 | const char *str = qstring_get_str(qobject_to(QString, | |
335 | entry->value)); | |
336 | if (parse_uint_full(str, &length, 10) == 0 && | |
337 | length > 0 && length <= UINT_MAX) { | |
338 | block_acct_add_interval(stats, (unsigned) length); | |
339 | } else { | |
340 | error_setg(errp, "Invalid interval length: %s", str); | |
341 | return false; | |
342 | } | |
343 | break; | |
344 | } | |
345 | ||
346 | case QTYPE_QNUM: { | |
347 | int64_t length = qnum_get_int(qobject_to(QNum, entry->value)); | |
348 | ||
349 | if (length > 0 && length <= UINT_MAX) { | |
350 | block_acct_add_interval(stats, (unsigned) length); | |
351 | } else { | |
352 | error_setg(errp, "Invalid interval length: %" PRId64, length); | |
353 | return false; | |
354 | } | |
355 | break; | |
356 | } | |
357 | ||
358 | default: | |
359 | error_setg(errp, "The specification of stats-intervals is invalid"); | |
360 | return false; | |
361 | } | |
362 | } | |
363 | return true; | |
364 | } | |
365 | ||
366 | typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; | |
367 | ||
368 | /* All parameters but @opts are optional and may be set to NULL. */ | |
369 | static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, | |
370 | const char **throttling_group, ThrottleConfig *throttle_cfg, | |
371 | BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) | |
372 | { | |
373 | Error *local_error = NULL; | |
374 | const char *aio; | |
375 | ||
376 | if (bdrv_flags) { | |
377 | if (qemu_opt_get_bool(opts, "copy-on-read", false)) { | |
378 | *bdrv_flags |= BDRV_O_COPY_ON_READ; | |
379 | } | |
380 | ||
381 | if ((aio = qemu_opt_get(opts, "aio")) != NULL) { | |
382 | if (bdrv_parse_aio(aio, bdrv_flags) < 0) { | |
383 | error_setg(errp, "invalid aio option"); | |
384 | return; | |
385 | } | |
386 | } | |
387 | } | |
388 | ||
389 | /* disk I/O throttling */ | |
390 | if (throttling_group) { | |
391 | *throttling_group = qemu_opt_get(opts, "throttling.group"); | |
392 | } | |
393 | ||
394 | if (throttle_cfg) { | |
395 | throttle_config_init(throttle_cfg); | |
396 | throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = | |
397 | qemu_opt_get_number(opts, "throttling.bps-total", 0); | |
398 | throttle_cfg->buckets[THROTTLE_BPS_READ].avg = | |
399 | qemu_opt_get_number(opts, "throttling.bps-read", 0); | |
400 | throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = | |
401 | qemu_opt_get_number(opts, "throttling.bps-write", 0); | |
402 | throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = | |
403 | qemu_opt_get_number(opts, "throttling.iops-total", 0); | |
404 | throttle_cfg->buckets[THROTTLE_OPS_READ].avg = | |
405 | qemu_opt_get_number(opts, "throttling.iops-read", 0); | |
406 | throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = | |
407 | qemu_opt_get_number(opts, "throttling.iops-write", 0); | |
408 | ||
409 | throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = | |
410 | qemu_opt_get_number(opts, "throttling.bps-total-max", 0); | |
411 | throttle_cfg->buckets[THROTTLE_BPS_READ].max = | |
412 | qemu_opt_get_number(opts, "throttling.bps-read-max", 0); | |
413 | throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = | |
414 | qemu_opt_get_number(opts, "throttling.bps-write-max", 0); | |
415 | throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = | |
416 | qemu_opt_get_number(opts, "throttling.iops-total-max", 0); | |
417 | throttle_cfg->buckets[THROTTLE_OPS_READ].max = | |
418 | qemu_opt_get_number(opts, "throttling.iops-read-max", 0); | |
419 | throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = | |
420 | qemu_opt_get_number(opts, "throttling.iops-write-max", 0); | |
421 | ||
422 | throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = | |
423 | qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); | |
424 | throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = | |
425 | qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); | |
426 | throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = | |
427 | qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); | |
428 | throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = | |
429 | qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); | |
430 | throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = | |
431 | qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); | |
432 | throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = | |
433 | qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); | |
434 | ||
435 | throttle_cfg->op_size = | |
436 | qemu_opt_get_number(opts, "throttling.iops-size", 0); | |
437 | ||
438 | if (!throttle_is_valid(throttle_cfg, errp)) { | |
439 | return; | |
440 | } | |
441 | } | |
442 | ||
443 | if (detect_zeroes) { | |
444 | *detect_zeroes = | |
445 | qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, | |
446 | qemu_opt_get(opts, "detect-zeroes"), | |
447 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, | |
448 | &local_error); | |
449 | if (local_error) { | |
450 | error_propagate(errp, local_error); | |
451 | return; | |
452 | } | |
453 | } | |
454 | } | |
455 | ||
456 | static OnOffAuto account_get_opt(QemuOpts *opts, const char *name) | |
457 | { | |
458 | if (!qemu_opt_find(opts, name)) { | |
459 | return ON_OFF_AUTO_AUTO; | |
460 | } | |
461 | if (qemu_opt_get_bool(opts, name, true)) { | |
462 | return ON_OFF_AUTO_ON; | |
463 | } | |
464 | return ON_OFF_AUTO_OFF; | |
465 | } | |
466 | ||
467 | /* Takes the ownership of bs_opts */ | |
468 | static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, | |
469 | Error **errp) | |
470 | { | |
471 | const char *buf; | |
472 | int bdrv_flags = 0; | |
473 | int on_read_error, on_write_error; | |
474 | OnOffAuto account_invalid, account_failed; | |
475 | bool writethrough, read_only; | |
476 | BlockBackend *blk; | |
477 | BlockDriverState *bs; | |
478 | ThrottleConfig cfg; | |
479 | int snapshot = 0; | |
480 | Error *error = NULL; | |
481 | QemuOpts *opts; | |
482 | QDict *interval_dict = NULL; | |
483 | QList *interval_list = NULL; | |
484 | const char *id; | |
485 | BlockdevDetectZeroesOptions detect_zeroes = | |
486 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; | |
487 | const char *throttling_group = NULL; | |
488 | ||
489 | /* Check common options by copying from bs_opts to opts, all other options | |
490 | * stay in bs_opts for processing by bdrv_open(). */ | |
491 | id = qdict_get_try_str(bs_opts, "id"); | |
492 | opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, errp); | |
493 | if (!opts) { | |
494 | goto err_no_opts; | |
495 | } | |
496 | ||
497 | if (!qemu_opts_absorb_qdict(opts, bs_opts, errp)) { | |
498 | goto early_err; | |
499 | } | |
500 | ||
501 | if (id) { | |
502 | qdict_del(bs_opts, "id"); | |
503 | } | |
504 | ||
505 | /* extract parameters */ | |
506 | snapshot = qemu_opt_get_bool(opts, "snapshot", 0); | |
507 | ||
508 | account_invalid = account_get_opt(opts, "stats-account-invalid"); | |
509 | account_failed = account_get_opt(opts, "stats-account-failed"); | |
510 | ||
511 | writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); | |
512 | ||
513 | id = qemu_opts_id(opts); | |
514 | ||
515 | qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); | |
516 | qdict_array_split(interval_dict, &interval_list); | |
517 | ||
518 | if (qdict_size(interval_dict) != 0) { | |
519 | error_setg(errp, "Invalid option stats-intervals.%s", | |
520 | qdict_first(interval_dict)->key); | |
521 | goto early_err; | |
522 | } | |
523 | ||
524 | extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, | |
525 | &detect_zeroes, &error); | |
526 | if (error) { | |
527 | error_propagate(errp, error); | |
528 | goto early_err; | |
529 | } | |
530 | ||
531 | if ((buf = qemu_opt_get(opts, "format")) != NULL) { | |
532 | if (is_help_option(buf)) { | |
533 | qemu_printf("Supported formats:"); | |
534 | bdrv_iterate_format(bdrv_format_print, NULL, false); | |
535 | qemu_printf("\nSupported formats (read-only):"); | |
536 | bdrv_iterate_format(bdrv_format_print, NULL, true); | |
537 | qemu_printf("\n"); | |
538 | goto early_err; | |
539 | } | |
540 | ||
541 | if (qdict_haskey(bs_opts, "driver")) { | |
542 | error_setg(errp, "Cannot specify both 'driver' and 'format'"); | |
543 | goto early_err; | |
544 | } | |
545 | qdict_put_str(bs_opts, "driver", buf); | |
546 | } | |
547 | ||
548 | on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; | |
549 | if ((buf = qemu_opt_get(opts, "werror")) != NULL) { | |
550 | on_write_error = parse_block_error_action(buf, 0, &error); | |
551 | if (error) { | |
552 | error_propagate(errp, error); | |
553 | goto early_err; | |
554 | } | |
555 | } | |
556 | ||
557 | on_read_error = BLOCKDEV_ON_ERROR_REPORT; | |
558 | if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { | |
559 | on_read_error = parse_block_error_action(buf, 1, &error); | |
560 | if (error) { | |
561 | error_propagate(errp, error); | |
562 | goto early_err; | |
563 | } | |
564 | } | |
565 | ||
566 | if (snapshot) { | |
567 | bdrv_flags |= BDRV_O_SNAPSHOT; | |
568 | } | |
569 | ||
570 | read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); | |
571 | ||
572 | /* init */ | |
573 | if ((!file || !*file) && !qdict_size(bs_opts)) { | |
574 | BlockBackendRootState *blk_rs; | |
575 | ||
576 | blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL); | |
577 | blk_rs = blk_get_root_state(blk); | |
578 | blk_rs->open_flags = bdrv_flags | (read_only ? 0 : BDRV_O_RDWR); | |
579 | blk_rs->detect_zeroes = detect_zeroes; | |
580 | ||
581 | qobject_unref(bs_opts); | |
582 | } else { | |
583 | if (file && !*file) { | |
584 | file = NULL; | |
585 | } | |
586 | ||
587 | /* bdrv_open() defaults to the values in bdrv_flags (for compatibility | |
588 | * with other callers) rather than what we want as the real defaults. | |
589 | * Apply the defaults here instead. */ | |
590 | qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); | |
591 | qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); | |
592 | qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, | |
593 | read_only ? "on" : "off"); | |
594 | qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on"); | |
595 | assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); | |
596 | ||
597 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
598 | bdrv_flags |= BDRV_O_INACTIVE; | |
599 | } | |
600 | ||
601 | blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); | |
602 | if (!blk) { | |
603 | goto err_no_bs_opts; | |
604 | } | |
605 | bs = blk_bs(blk); | |
606 | ||
607 | bs->detect_zeroes = detect_zeroes; | |
608 | ||
609 | block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); | |
610 | ||
611 | if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { | |
612 | blk_unref(blk); | |
613 | blk = NULL; | |
614 | goto err_no_bs_opts; | |
615 | } | |
616 | } | |
617 | ||
618 | /* disk I/O throttling */ | |
619 | if (throttle_enabled(&cfg)) { | |
620 | if (!throttling_group) { | |
621 | throttling_group = id; | |
622 | } | |
623 | blk_io_limits_enable(blk, throttling_group); | |
624 | blk_set_io_limits(blk, &cfg); | |
625 | } | |
626 | ||
627 | blk_set_enable_write_cache(blk, !writethrough); | |
628 | blk_set_on_error(blk, on_read_error, on_write_error); | |
629 | ||
630 | if (!monitor_add_blk(blk, id, errp)) { | |
631 | blk_unref(blk); | |
632 | blk = NULL; | |
633 | goto err_no_bs_opts; | |
634 | } | |
635 | ||
636 | err_no_bs_opts: | |
637 | qemu_opts_del(opts); | |
638 | qobject_unref(interval_dict); | |
639 | qobject_unref(interval_list); | |
640 | return blk; | |
641 | ||
642 | early_err: | |
643 | qemu_opts_del(opts); | |
644 | qobject_unref(interval_dict); | |
645 | qobject_unref(interval_list); | |
646 | err_no_opts: | |
647 | qobject_unref(bs_opts); | |
648 | return NULL; | |
649 | } | |
650 | ||
651 | /* Takes the ownership of bs_opts */ | |
652 | BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) | |
653 | { | |
654 | int bdrv_flags = 0; | |
655 | ||
656 | GLOBAL_STATE_CODE(); | |
657 | /* bdrv_open() defaults to the values in bdrv_flags (for compatibility | |
658 | * with other callers) rather than what we want as the real defaults. | |
659 | * Apply the defaults here instead. */ | |
660 | qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); | |
661 | qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); | |
662 | qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); | |
663 | ||
664 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
665 | bdrv_flags |= BDRV_O_INACTIVE; | |
666 | } | |
667 | ||
668 | return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); | |
669 | } | |
670 | ||
671 | void blockdev_close_all_bdrv_states(void) | |
672 | { | |
673 | BlockDriverState *bs, *next_bs; | |
674 | ||
675 | GLOBAL_STATE_CODE(); | |
676 | QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { | |
677 | AioContext *ctx = bdrv_get_aio_context(bs); | |
678 | ||
679 | aio_context_acquire(ctx); | |
680 | bdrv_unref(bs); | |
681 | aio_context_release(ctx); | |
682 | } | |
683 | } | |
684 | ||
685 | /* Iterates over the list of monitor-owned BlockDriverStates */ | |
686 | BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) | |
687 | { | |
688 | GLOBAL_STATE_CODE(); | |
689 | return bs ? QTAILQ_NEXT(bs, monitor_list) | |
690 | : QTAILQ_FIRST(&monitor_bdrv_states); | |
691 | } | |
692 | ||
693 | static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, | |
694 | Error **errp) | |
695 | { | |
696 | const char *value; | |
697 | ||
698 | value = qemu_opt_get(opts, from); | |
699 | if (value) { | |
700 | if (qemu_opt_find(opts, to)) { | |
701 | error_setg(errp, "'%s' and its alias '%s' can't be used at the " | |
702 | "same time", to, from); | |
703 | return false; | |
704 | } | |
705 | } | |
706 | ||
707 | /* rename all items in opts */ | |
708 | while ((value = qemu_opt_get(opts, from))) { | |
709 | qemu_opt_set(opts, to, value, &error_abort); | |
710 | qemu_opt_unset(opts, from); | |
711 | } | |
712 | return true; | |
713 | } | |
714 | ||
715 | QemuOptsList qemu_legacy_drive_opts = { | |
716 | .name = "drive", | |
717 | .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), | |
718 | .desc = { | |
719 | { | |
720 | .name = "bus", | |
721 | .type = QEMU_OPT_NUMBER, | |
722 | .help = "bus number", | |
723 | },{ | |
724 | .name = "unit", | |
725 | .type = QEMU_OPT_NUMBER, | |
726 | .help = "unit number (i.e. lun for scsi)", | |
727 | },{ | |
728 | .name = "index", | |
729 | .type = QEMU_OPT_NUMBER, | |
730 | .help = "index number", | |
731 | },{ | |
732 | .name = "media", | |
733 | .type = QEMU_OPT_STRING, | |
734 | .help = "media type (disk, cdrom)", | |
735 | },{ | |
736 | .name = "if", | |
737 | .type = QEMU_OPT_STRING, | |
738 | .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", | |
739 | },{ | |
740 | .name = "file", | |
741 | .type = QEMU_OPT_STRING, | |
742 | .help = "file name", | |
743 | }, | |
744 | ||
745 | /* Options that are passed on, but have special semantics with -drive */ | |
746 | { | |
747 | .name = BDRV_OPT_READ_ONLY, | |
748 | .type = QEMU_OPT_BOOL, | |
749 | .help = "open drive file as read-only", | |
750 | },{ | |
751 | .name = "rerror", | |
752 | .type = QEMU_OPT_STRING, | |
753 | .help = "read error action", | |
754 | },{ | |
755 | .name = "werror", | |
756 | .type = QEMU_OPT_STRING, | |
757 | .help = "write error action", | |
758 | },{ | |
759 | .name = "copy-on-read", | |
760 | .type = QEMU_OPT_BOOL, | |
761 | .help = "copy read data from backing file into image file", | |
762 | }, | |
763 | ||
764 | { /* end of list */ } | |
765 | }, | |
766 | }; | |
767 | ||
768 | DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, | |
769 | Error **errp) | |
770 | { | |
771 | const char *value; | |
772 | BlockBackend *blk; | |
773 | DriveInfo *dinfo = NULL; | |
774 | QDict *bs_opts; | |
775 | QemuOpts *legacy_opts; | |
776 | DriveMediaType media = MEDIA_DISK; | |
777 | BlockInterfaceType type; | |
778 | int max_devs, bus_id, unit_id, index; | |
779 | const char *werror, *rerror; | |
780 | bool read_only = false; | |
781 | bool copy_on_read; | |
782 | const char *filename; | |
783 | int i; | |
784 | ||
785 | GLOBAL_STATE_CODE(); | |
786 | ||
787 | /* Change legacy command line options into QMP ones */ | |
788 | static const struct { | |
789 | const char *from; | |
790 | const char *to; | |
791 | } opt_renames[] = { | |
792 | { "iops", "throttling.iops-total" }, | |
793 | { "iops_rd", "throttling.iops-read" }, | |
794 | { "iops_wr", "throttling.iops-write" }, | |
795 | ||
796 | { "bps", "throttling.bps-total" }, | |
797 | { "bps_rd", "throttling.bps-read" }, | |
798 | { "bps_wr", "throttling.bps-write" }, | |
799 | ||
800 | { "iops_max", "throttling.iops-total-max" }, | |
801 | { "iops_rd_max", "throttling.iops-read-max" }, | |
802 | { "iops_wr_max", "throttling.iops-write-max" }, | |
803 | ||
804 | { "bps_max", "throttling.bps-total-max" }, | |
805 | { "bps_rd_max", "throttling.bps-read-max" }, | |
806 | { "bps_wr_max", "throttling.bps-write-max" }, | |
807 | ||
808 | { "iops_size", "throttling.iops-size" }, | |
809 | ||
810 | { "group", "throttling.group" }, | |
811 | ||
812 | { "readonly", BDRV_OPT_READ_ONLY }, | |
813 | }; | |
814 | ||
815 | for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { | |
816 | if (!qemu_opt_rename(all_opts, opt_renames[i].from, | |
817 | opt_renames[i].to, errp)) { | |
818 | return NULL; | |
819 | } | |
820 | } | |
821 | ||
822 | value = qemu_opt_get(all_opts, "cache"); | |
823 | if (value) { | |
824 | int flags = 0; | |
825 | bool writethrough; | |
826 | ||
827 | if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { | |
828 | error_setg(errp, "invalid cache option"); | |
829 | return NULL; | |
830 | } | |
831 | ||
832 | /* Specific options take precedence */ | |
833 | if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { | |
834 | qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, | |
835 | !writethrough, &error_abort); | |
836 | } | |
837 | if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { | |
838 | qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, | |
839 | !!(flags & BDRV_O_NOCACHE), &error_abort); | |
840 | } | |
841 | if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { | |
842 | qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, | |
843 | !!(flags & BDRV_O_NO_FLUSH), &error_abort); | |
844 | } | |
845 | qemu_opt_unset(all_opts, "cache"); | |
846 | } | |
847 | ||
848 | /* Get a QDict for processing the options */ | |
849 | bs_opts = qdict_new(); | |
850 | qemu_opts_to_qdict(all_opts, bs_opts); | |
851 | ||
852 | legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, | |
853 | &error_abort); | |
854 | if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) { | |
855 | goto fail; | |
856 | } | |
857 | ||
858 | /* Media type */ | |
859 | value = qemu_opt_get(legacy_opts, "media"); | |
860 | if (value) { | |
861 | if (!strcmp(value, "disk")) { | |
862 | media = MEDIA_DISK; | |
863 | } else if (!strcmp(value, "cdrom")) { | |
864 | media = MEDIA_CDROM; | |
865 | read_only = true; | |
866 | } else { | |
867 | error_setg(errp, "'%s' invalid media", value); | |
868 | goto fail; | |
869 | } | |
870 | } | |
871 | ||
872 | /* copy-on-read is disabled with a warning for read-only devices */ | |
873 | read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); | |
874 | copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); | |
875 | ||
876 | if (read_only && copy_on_read) { | |
877 | warn_report("disabling copy-on-read on read-only drive"); | |
878 | copy_on_read = false; | |
879 | } | |
880 | ||
881 | qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); | |
882 | qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); | |
883 | ||
884 | /* Controller type */ | |
885 | value = qemu_opt_get(legacy_opts, "if"); | |
886 | if (value) { | |
887 | for (type = 0; | |
888 | type < IF_COUNT && strcmp(value, if_name[type]); | |
889 | type++) { | |
890 | } | |
891 | if (type == IF_COUNT) { | |
892 | error_setg(errp, "unsupported bus type '%s'", value); | |
893 | goto fail; | |
894 | } | |
895 | } else { | |
896 | type = block_default_type; | |
897 | } | |
898 | ||
899 | /* Device address specified by bus/unit or index. | |
900 | * If none was specified, try to find the first free one. */ | |
901 | bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); | |
902 | unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); | |
903 | index = qemu_opt_get_number(legacy_opts, "index", -1); | |
904 | ||
905 | max_devs = if_max_devs[type]; | |
906 | ||
907 | if (index != -1) { | |
908 | if (bus_id != 0 || unit_id != -1) { | |
909 | error_setg(errp, "index cannot be used with bus and unit"); | |
910 | goto fail; | |
911 | } | |
912 | bus_id = drive_index_to_bus_id(type, index); | |
913 | unit_id = drive_index_to_unit_id(type, index); | |
914 | } | |
915 | ||
916 | if (unit_id == -1) { | |
917 | unit_id = 0; | |
918 | while (drive_get(type, bus_id, unit_id) != NULL) { | |
919 | unit_id++; | |
920 | if (max_devs && unit_id >= max_devs) { | |
921 | unit_id -= max_devs; | |
922 | bus_id++; | |
923 | } | |
924 | } | |
925 | } | |
926 | ||
927 | if (max_devs && unit_id >= max_devs) { | |
928 | error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); | |
929 | goto fail; | |
930 | } | |
931 | ||
932 | if (drive_get(type, bus_id, unit_id) != NULL) { | |
933 | error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", | |
934 | bus_id, unit_id, index); | |
935 | goto fail; | |
936 | } | |
937 | ||
938 | /* no id supplied -> create one */ | |
939 | if (qemu_opts_id(all_opts) == NULL) { | |
940 | char *new_id; | |
941 | const char *mediastr = ""; | |
942 | if (type == IF_IDE || type == IF_SCSI) { | |
943 | mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; | |
944 | } | |
945 | if (max_devs) { | |
946 | new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, | |
947 | mediastr, unit_id); | |
948 | } else { | |
949 | new_id = g_strdup_printf("%s%s%i", if_name[type], | |
950 | mediastr, unit_id); | |
951 | } | |
952 | qdict_put_str(bs_opts, "id", new_id); | |
953 | g_free(new_id); | |
954 | } | |
955 | ||
956 | /* Add virtio block device */ | |
957 | if (type == IF_VIRTIO) { | |
958 | QemuOpts *devopts; | |
959 | devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, | |
960 | &error_abort); | |
961 | qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort); | |
962 | qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), | |
963 | &error_abort); | |
964 | } | |
965 | ||
966 | filename = qemu_opt_get(legacy_opts, "file"); | |
967 | ||
968 | /* Check werror/rerror compatibility with if=... */ | |
969 | werror = qemu_opt_get(legacy_opts, "werror"); | |
970 | if (werror != NULL) { | |
971 | if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && | |
972 | type != IF_NONE) { | |
973 | error_setg(errp, "werror is not supported by this bus type"); | |
974 | goto fail; | |
975 | } | |
976 | qdict_put_str(bs_opts, "werror", werror); | |
977 | } | |
978 | ||
979 | rerror = qemu_opt_get(legacy_opts, "rerror"); | |
980 | if (rerror != NULL) { | |
981 | if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && | |
982 | type != IF_NONE) { | |
983 | error_setg(errp, "rerror is not supported by this bus type"); | |
984 | goto fail; | |
985 | } | |
986 | qdict_put_str(bs_opts, "rerror", rerror); | |
987 | } | |
988 | ||
989 | /* Actual block device init: Functionality shared with blockdev-add */ | |
990 | blk = blockdev_init(filename, bs_opts, errp); | |
991 | bs_opts = NULL; | |
992 | if (!blk) { | |
993 | goto fail; | |
994 | } | |
995 | ||
996 | /* Create legacy DriveInfo */ | |
997 | dinfo = g_malloc0(sizeof(*dinfo)); | |
998 | dinfo->opts = all_opts; | |
999 | ||
1000 | dinfo->type = type; | |
1001 | dinfo->bus = bus_id; | |
1002 | dinfo->unit = unit_id; | |
1003 | ||
1004 | blk_set_legacy_dinfo(blk, dinfo); | |
1005 | ||
1006 | switch(type) { | |
1007 | case IF_IDE: | |
1008 | case IF_SCSI: | |
1009 | case IF_XEN: | |
1010 | case IF_NONE: | |
1011 | dinfo->media_cd = media == MEDIA_CDROM; | |
1012 | break; | |
1013 | default: | |
1014 | break; | |
1015 | } | |
1016 | ||
1017 | fail: | |
1018 | qemu_opts_del(legacy_opts); | |
1019 | qobject_unref(bs_opts); | |
1020 | return dinfo; | |
1021 | } | |
1022 | ||
1023 | static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) | |
1024 | { | |
1025 | BlockDriverState *bs; | |
1026 | ||
1027 | bs = bdrv_lookup_bs(name, name, errp); | |
1028 | if (bs == NULL) { | |
1029 | return NULL; | |
1030 | } | |
1031 | ||
1032 | if (!bdrv_is_root_node(bs)) { | |
1033 | error_setg(errp, "Need a root block node"); | |
1034 | return NULL; | |
1035 | } | |
1036 | ||
1037 | if (!bdrv_is_inserted(bs)) { | |
1038 | error_setg(errp, "Device has no medium"); | |
1039 | return NULL; | |
1040 | } | |
1041 | ||
1042 | return bs; | |
1043 | } | |
1044 | ||
1045 | static void blockdev_do_action(TransactionAction *action, Error **errp) | |
1046 | { | |
1047 | TransactionActionList list; | |
1048 | ||
1049 | list.value = action; | |
1050 | list.next = NULL; | |
1051 | qmp_transaction(&list, false, NULL, errp); | |
1052 | } | |
1053 | ||
1054 | void qmp_blockdev_snapshot_sync(bool has_device, const char *device, | |
1055 | bool has_node_name, const char *node_name, | |
1056 | const char *snapshot_file, | |
1057 | bool has_snapshot_node_name, | |
1058 | const char *snapshot_node_name, | |
1059 | bool has_format, const char *format, | |
1060 | bool has_mode, NewImageMode mode, Error **errp) | |
1061 | { | |
1062 | BlockdevSnapshotSync snapshot = { | |
1063 | .has_device = has_device, | |
1064 | .device = (char *) device, | |
1065 | .has_node_name = has_node_name, | |
1066 | .node_name = (char *) node_name, | |
1067 | .snapshot_file = (char *) snapshot_file, | |
1068 | .has_snapshot_node_name = has_snapshot_node_name, | |
1069 | .snapshot_node_name = (char *) snapshot_node_name, | |
1070 | .has_format = has_format, | |
1071 | .format = (char *) format, | |
1072 | .has_mode = has_mode, | |
1073 | .mode = mode, | |
1074 | }; | |
1075 | TransactionAction action = { | |
1076 | .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, | |
1077 | .u.blockdev_snapshot_sync.data = &snapshot, | |
1078 | }; | |
1079 | blockdev_do_action(&action, errp); | |
1080 | } | |
1081 | ||
1082 | void qmp_blockdev_snapshot(const char *node, const char *overlay, | |
1083 | Error **errp) | |
1084 | { | |
1085 | BlockdevSnapshot snapshot_data = { | |
1086 | .node = (char *) node, | |
1087 | .overlay = (char *) overlay | |
1088 | }; | |
1089 | TransactionAction action = { | |
1090 | .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, | |
1091 | .u.blockdev_snapshot.data = &snapshot_data, | |
1092 | }; | |
1093 | blockdev_do_action(&action, errp); | |
1094 | } | |
1095 | ||
1096 | void qmp_blockdev_snapshot_internal_sync(const char *device, | |
1097 | const char *name, | |
1098 | Error **errp) | |
1099 | { | |
1100 | BlockdevSnapshotInternal snapshot = { | |
1101 | .device = (char *) device, | |
1102 | .name = (char *) name | |
1103 | }; | |
1104 | TransactionAction action = { | |
1105 | .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, | |
1106 | .u.blockdev_snapshot_internal_sync.data = &snapshot, | |
1107 | }; | |
1108 | blockdev_do_action(&action, errp); | |
1109 | } | |
1110 | ||
1111 | SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, | |
1112 | bool has_id, | |
1113 | const char *id, | |
1114 | bool has_name, | |
1115 | const char *name, | |
1116 | Error **errp) | |
1117 | { | |
1118 | BlockDriverState *bs; | |
1119 | AioContext *aio_context; | |
1120 | QEMUSnapshotInfo sn; | |
1121 | Error *local_err = NULL; | |
1122 | SnapshotInfo *info = NULL; | |
1123 | int ret; | |
1124 | ||
1125 | bs = qmp_get_root_bs(device, errp); | |
1126 | if (!bs) { | |
1127 | return NULL; | |
1128 | } | |
1129 | aio_context = bdrv_get_aio_context(bs); | |
1130 | aio_context_acquire(aio_context); | |
1131 | ||
1132 | if (!has_id) { | |
1133 | id = NULL; | |
1134 | } | |
1135 | ||
1136 | if (!has_name) { | |
1137 | name = NULL; | |
1138 | } | |
1139 | ||
1140 | if (!id && !name) { | |
1141 | error_setg(errp, "Name or id must be provided"); | |
1142 | goto out_aio_context; | |
1143 | } | |
1144 | ||
1145 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { | |
1146 | goto out_aio_context; | |
1147 | } | |
1148 | ||
1149 | ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); | |
1150 | if (local_err) { | |
1151 | error_propagate(errp, local_err); | |
1152 | goto out_aio_context; | |
1153 | } | |
1154 | if (!ret) { | |
1155 | error_setg(errp, | |
1156 | "Snapshot with id '%s' and name '%s' does not exist on " | |
1157 | "device '%s'", | |
1158 | STR_OR_NULL(id), STR_OR_NULL(name), device); | |
1159 | goto out_aio_context; | |
1160 | } | |
1161 | ||
1162 | bdrv_snapshot_delete(bs, id, name, &local_err); | |
1163 | if (local_err) { | |
1164 | error_propagate(errp, local_err); | |
1165 | goto out_aio_context; | |
1166 | } | |
1167 | ||
1168 | aio_context_release(aio_context); | |
1169 | ||
1170 | info = g_new0(SnapshotInfo, 1); | |
1171 | info->id = g_strdup(sn.id_str); | |
1172 | info->name = g_strdup(sn.name); | |
1173 | info->date_nsec = sn.date_nsec; | |
1174 | info->date_sec = sn.date_sec; | |
1175 | info->vm_state_size = sn.vm_state_size; | |
1176 | info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; | |
1177 | info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; | |
1178 | if (sn.icount != -1ULL) { | |
1179 | info->icount = sn.icount; | |
1180 | info->has_icount = true; | |
1181 | } | |
1182 | ||
1183 | return info; | |
1184 | ||
1185 | out_aio_context: | |
1186 | aio_context_release(aio_context); | |
1187 | return NULL; | |
1188 | } | |
1189 | ||
1190 | /* New and old BlockDriverState structs for atomic group operations */ | |
1191 | ||
1192 | typedef struct BlkActionState BlkActionState; | |
1193 | ||
1194 | /** | |
1195 | * BlkActionOps: | |
1196 | * Table of operations that define an Action. | |
1197 | * | |
1198 | * @instance_size: Size of state struct, in bytes. | |
1199 | * @prepare: Prepare the work, must NOT be NULL. | |
1200 | * @commit: Commit the changes, can be NULL. | |
1201 | * @abort: Abort the changes on fail, can be NULL. | |
1202 | * @clean: Clean up resources after all transaction actions have called | |
1203 | * commit() or abort(). Can be NULL. | |
1204 | * | |
1205 | * Only prepare() may fail. In a single transaction, only one of commit() or | |
1206 | * abort() will be called. clean() will always be called if it is present. | |
1207 | * | |
1208 | * Always run under BQL. | |
1209 | */ | |
1210 | typedef struct BlkActionOps { | |
1211 | size_t instance_size; | |
1212 | void (*prepare)(BlkActionState *common, Error **errp); | |
1213 | void (*commit)(BlkActionState *common); | |
1214 | void (*abort)(BlkActionState *common); | |
1215 | void (*clean)(BlkActionState *common); | |
1216 | } BlkActionOps; | |
1217 | ||
1218 | /** | |
1219 | * BlkActionState: | |
1220 | * Describes one Action's state within a Transaction. | |
1221 | * | |
1222 | * @action: QAPI-defined enum identifying which Action to perform. | |
1223 | * @ops: Table of ActionOps this Action can perform. | |
1224 | * @block_job_txn: Transaction which this action belongs to. | |
1225 | * @entry: List membership for all Actions in this Transaction. | |
1226 | * | |
1227 | * This structure must be arranged as first member in a subclassed type, | |
1228 | * assuming that the compiler will also arrange it to the same offsets as the | |
1229 | * base class. | |
1230 | */ | |
1231 | struct BlkActionState { | |
1232 | TransactionAction *action; | |
1233 | const BlkActionOps *ops; | |
1234 | JobTxn *block_job_txn; | |
1235 | TransactionProperties *txn_props; | |
1236 | QTAILQ_ENTRY(BlkActionState) entry; | |
1237 | }; | |
1238 | ||
1239 | /* internal snapshot private data */ | |
1240 | typedef struct InternalSnapshotState { | |
1241 | BlkActionState common; | |
1242 | BlockDriverState *bs; | |
1243 | QEMUSnapshotInfo sn; | |
1244 | bool created; | |
1245 | } InternalSnapshotState; | |
1246 | ||
1247 | ||
1248 | static int action_check_completion_mode(BlkActionState *s, Error **errp) | |
1249 | { | |
1250 | if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { | |
1251 | error_setg(errp, | |
1252 | "Action '%s' does not support Transaction property " | |
1253 | "completion-mode = %s", | |
1254 | TransactionActionKind_str(s->action->type), | |
1255 | ActionCompletionMode_str(s->txn_props->completion_mode)); | |
1256 | return -1; | |
1257 | } | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | static void internal_snapshot_prepare(BlkActionState *common, | |
1262 | Error **errp) | |
1263 | { | |
1264 | Error *local_err = NULL; | |
1265 | const char *device; | |
1266 | const char *name; | |
1267 | BlockDriverState *bs; | |
1268 | QEMUSnapshotInfo old_sn, *sn; | |
1269 | bool ret; | |
1270 | int64_t rt; | |
1271 | BlockdevSnapshotInternal *internal; | |
1272 | InternalSnapshotState *state; | |
1273 | AioContext *aio_context; | |
1274 | int ret1; | |
1275 | ||
1276 | g_assert(common->action->type == | |
1277 | TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); | |
1278 | internal = common->action->u.blockdev_snapshot_internal_sync.data; | |
1279 | state = DO_UPCAST(InternalSnapshotState, common, common); | |
1280 | ||
1281 | /* 1. parse input */ | |
1282 | device = internal->device; | |
1283 | name = internal->name; | |
1284 | ||
1285 | /* 2. check for validation */ | |
1286 | if (action_check_completion_mode(common, errp) < 0) { | |
1287 | return; | |
1288 | } | |
1289 | ||
1290 | bs = qmp_get_root_bs(device, errp); | |
1291 | if (!bs) { | |
1292 | return; | |
1293 | } | |
1294 | ||
1295 | aio_context = bdrv_get_aio_context(bs); | |
1296 | aio_context_acquire(aio_context); | |
1297 | ||
1298 | state->bs = bs; | |
1299 | ||
1300 | /* Paired with .clean() */ | |
1301 | bdrv_drained_begin(bs); | |
1302 | ||
1303 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { | |
1304 | goto out; | |
1305 | } | |
1306 | ||
1307 | if (bdrv_is_read_only(bs)) { | |
1308 | error_setg(errp, "Device '%s' is read only", device); | |
1309 | goto out; | |
1310 | } | |
1311 | ||
1312 | if (!bdrv_can_snapshot(bs)) { | |
1313 | error_setg(errp, "Block format '%s' used by device '%s' " | |
1314 | "does not support internal snapshots", | |
1315 | bs->drv->format_name, device); | |
1316 | goto out; | |
1317 | } | |
1318 | ||
1319 | if (!strlen(name)) { | |
1320 | error_setg(errp, "Name is empty"); | |
1321 | goto out; | |
1322 | } | |
1323 | ||
1324 | /* check whether a snapshot with name exist */ | |
1325 | ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, | |
1326 | &local_err); | |
1327 | if (local_err) { | |
1328 | error_propagate(errp, local_err); | |
1329 | goto out; | |
1330 | } else if (ret) { | |
1331 | error_setg(errp, | |
1332 | "Snapshot with name '%s' already exists on device '%s'", | |
1333 | name, device); | |
1334 | goto out; | |
1335 | } | |
1336 | ||
1337 | /* 3. take the snapshot */ | |
1338 | sn = &state->sn; | |
1339 | pstrcpy(sn->name, sizeof(sn->name), name); | |
1340 | rt = g_get_real_time(); | |
1341 | sn->date_sec = rt / G_USEC_PER_SEC; | |
1342 | sn->date_nsec = (rt % G_USEC_PER_SEC) * 1000; | |
1343 | sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); | |
1344 | if (replay_mode != REPLAY_MODE_NONE) { | |
1345 | sn->icount = replay_get_current_icount(); | |
1346 | } else { | |
1347 | sn->icount = -1ULL; | |
1348 | } | |
1349 | ||
1350 | ret1 = bdrv_snapshot_create(bs, sn); | |
1351 | if (ret1 < 0) { | |
1352 | error_setg_errno(errp, -ret1, | |
1353 | "Failed to create snapshot '%s' on device '%s'", | |
1354 | name, device); | |
1355 | goto out; | |
1356 | } | |
1357 | ||
1358 | /* 4. succeed, mark a snapshot is created */ | |
1359 | state->created = true; | |
1360 | ||
1361 | out: | |
1362 | aio_context_release(aio_context); | |
1363 | } | |
1364 | ||
1365 | static void internal_snapshot_abort(BlkActionState *common) | |
1366 | { | |
1367 | InternalSnapshotState *state = | |
1368 | DO_UPCAST(InternalSnapshotState, common, common); | |
1369 | BlockDriverState *bs = state->bs; | |
1370 | QEMUSnapshotInfo *sn = &state->sn; | |
1371 | AioContext *aio_context; | |
1372 | Error *local_error = NULL; | |
1373 | ||
1374 | if (!state->created) { | |
1375 | return; | |
1376 | } | |
1377 | ||
1378 | aio_context = bdrv_get_aio_context(state->bs); | |
1379 | aio_context_acquire(aio_context); | |
1380 | ||
1381 | if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { | |
1382 | error_reportf_err(local_error, | |
1383 | "Failed to delete snapshot with id '%s' and " | |
1384 | "name '%s' on device '%s' in abort: ", | |
1385 | sn->id_str, sn->name, | |
1386 | bdrv_get_device_name(bs)); | |
1387 | } | |
1388 | ||
1389 | aio_context_release(aio_context); | |
1390 | } | |
1391 | ||
1392 | static void internal_snapshot_clean(BlkActionState *common) | |
1393 | { | |
1394 | InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, | |
1395 | common, common); | |
1396 | AioContext *aio_context; | |
1397 | ||
1398 | if (!state->bs) { | |
1399 | return; | |
1400 | } | |
1401 | ||
1402 | aio_context = bdrv_get_aio_context(state->bs); | |
1403 | aio_context_acquire(aio_context); | |
1404 | ||
1405 | bdrv_drained_end(state->bs); | |
1406 | ||
1407 | aio_context_release(aio_context); | |
1408 | } | |
1409 | ||
1410 | /* external snapshot private data */ | |
1411 | typedef struct ExternalSnapshotState { | |
1412 | BlkActionState common; | |
1413 | BlockDriverState *old_bs; | |
1414 | BlockDriverState *new_bs; | |
1415 | bool overlay_appended; | |
1416 | } ExternalSnapshotState; | |
1417 | ||
1418 | static void external_snapshot_prepare(BlkActionState *common, | |
1419 | Error **errp) | |
1420 | { | |
1421 | int ret; | |
1422 | int flags = 0; | |
1423 | QDict *options = NULL; | |
1424 | Error *local_err = NULL; | |
1425 | /* Device and node name of the image to generate the snapshot from */ | |
1426 | const char *device; | |
1427 | const char *node_name; | |
1428 | /* Reference to the new image (for 'blockdev-snapshot') */ | |
1429 | const char *snapshot_ref; | |
1430 | /* File name of the new image (for 'blockdev-snapshot-sync') */ | |
1431 | const char *new_image_file; | |
1432 | ExternalSnapshotState *state = | |
1433 | DO_UPCAST(ExternalSnapshotState, common, common); | |
1434 | TransactionAction *action = common->action; | |
1435 | AioContext *aio_context; | |
1436 | uint64_t perm, shared; | |
1437 | ||
1438 | /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar | |
1439 | * purpose but a different set of parameters */ | |
1440 | switch (action->type) { | |
1441 | case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: | |
1442 | { | |
1443 | BlockdevSnapshot *s = action->u.blockdev_snapshot.data; | |
1444 | device = s->node; | |
1445 | node_name = s->node; | |
1446 | new_image_file = NULL; | |
1447 | snapshot_ref = s->overlay; | |
1448 | } | |
1449 | break; | |
1450 | case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: | |
1451 | { | |
1452 | BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; | |
1453 | device = s->has_device ? s->device : NULL; | |
1454 | node_name = s->has_node_name ? s->node_name : NULL; | |
1455 | new_image_file = s->snapshot_file; | |
1456 | snapshot_ref = NULL; | |
1457 | } | |
1458 | break; | |
1459 | default: | |
1460 | g_assert_not_reached(); | |
1461 | } | |
1462 | ||
1463 | /* start processing */ | |
1464 | if (action_check_completion_mode(common, errp) < 0) { | |
1465 | return; | |
1466 | } | |
1467 | ||
1468 | state->old_bs = bdrv_lookup_bs(device, node_name, errp); | |
1469 | if (!state->old_bs) { | |
1470 | return; | |
1471 | } | |
1472 | ||
1473 | aio_context = bdrv_get_aio_context(state->old_bs); | |
1474 | aio_context_acquire(aio_context); | |
1475 | ||
1476 | /* Paired with .clean() */ | |
1477 | bdrv_drained_begin(state->old_bs); | |
1478 | ||
1479 | if (!bdrv_is_inserted(state->old_bs)) { | |
1480 | error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); | |
1481 | goto out; | |
1482 | } | |
1483 | ||
1484 | if (bdrv_op_is_blocked(state->old_bs, | |
1485 | BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { | |
1486 | goto out; | |
1487 | } | |
1488 | ||
1489 | if (!bdrv_is_read_only(state->old_bs)) { | |
1490 | if (bdrv_flush(state->old_bs)) { | |
1491 | error_setg(errp, QERR_IO_ERROR); | |
1492 | goto out; | |
1493 | } | |
1494 | } | |
1495 | ||
1496 | if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { | |
1497 | BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; | |
1498 | const char *format = s->has_format ? s->format : "qcow2"; | |
1499 | enum NewImageMode mode; | |
1500 | const char *snapshot_node_name = | |
1501 | s->has_snapshot_node_name ? s->snapshot_node_name : NULL; | |
1502 | ||
1503 | if (node_name && !snapshot_node_name) { | |
1504 | error_setg(errp, "New overlay node-name missing"); | |
1505 | goto out; | |
1506 | } | |
1507 | ||
1508 | if (snapshot_node_name && | |
1509 | bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { | |
1510 | error_setg(errp, "New overlay node-name already in use"); | |
1511 | goto out; | |
1512 | } | |
1513 | ||
1514 | flags = state->old_bs->open_flags; | |
1515 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); | |
1516 | flags |= BDRV_O_NO_BACKING; | |
1517 | ||
1518 | /* create new image w/backing file */ | |
1519 | mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; | |
1520 | if (mode != NEW_IMAGE_MODE_EXISTING) { | |
1521 | int64_t size = bdrv_getlength(state->old_bs); | |
1522 | if (size < 0) { | |
1523 | error_setg_errno(errp, -size, "bdrv_getlength failed"); | |
1524 | goto out; | |
1525 | } | |
1526 | bdrv_refresh_filename(state->old_bs); | |
1527 | bdrv_img_create(new_image_file, format, | |
1528 | state->old_bs->filename, | |
1529 | state->old_bs->drv->format_name, | |
1530 | NULL, size, flags, false, &local_err); | |
1531 | if (local_err) { | |
1532 | error_propagate(errp, local_err); | |
1533 | goto out; | |
1534 | } | |
1535 | } | |
1536 | ||
1537 | options = qdict_new(); | |
1538 | if (snapshot_node_name) { | |
1539 | qdict_put_str(options, "node-name", snapshot_node_name); | |
1540 | } | |
1541 | qdict_put_str(options, "driver", format); | |
1542 | } | |
1543 | ||
1544 | state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, | |
1545 | errp); | |
1546 | /* We will manually add the backing_hd field to the bs later */ | |
1547 | if (!state->new_bs) { | |
1548 | goto out; | |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * Allow attaching a backing file to an overlay that's already in use only | |
1553 | * if the parents don't assume that they are already seeing a valid image. | |
1554 | * (Specifically, allow it as a mirror target, which is write-only access.) | |
1555 | */ | |
1556 | bdrv_get_cumulative_perm(state->new_bs, &perm, &shared); | |
1557 | if (perm & BLK_PERM_CONSISTENT_READ) { | |
1558 | error_setg(errp, "The overlay is already in use"); | |
1559 | goto out; | |
1560 | } | |
1561 | ||
1562 | if (state->new_bs->drv->is_filter) { | |
1563 | error_setg(errp, "Filters cannot be used as overlays"); | |
1564 | goto out; | |
1565 | } | |
1566 | ||
1567 | if (bdrv_cow_child(state->new_bs)) { | |
1568 | error_setg(errp, "The overlay already has a backing image"); | |
1569 | goto out; | |
1570 | } | |
1571 | ||
1572 | if (!state->new_bs->drv->supports_backing) { | |
1573 | error_setg(errp, "The overlay does not support backing images"); | |
1574 | goto out; | |
1575 | } | |
1576 | ||
1577 | ret = bdrv_append(state->new_bs, state->old_bs, errp); | |
1578 | if (ret < 0) { | |
1579 | goto out; | |
1580 | } | |
1581 | state->overlay_appended = true; | |
1582 | ||
1583 | out: | |
1584 | aio_context_release(aio_context); | |
1585 | } | |
1586 | ||
1587 | static void external_snapshot_commit(BlkActionState *common) | |
1588 | { | |
1589 | ExternalSnapshotState *state = | |
1590 | DO_UPCAST(ExternalSnapshotState, common, common); | |
1591 | AioContext *aio_context; | |
1592 | ||
1593 | aio_context = bdrv_get_aio_context(state->old_bs); | |
1594 | aio_context_acquire(aio_context); | |
1595 | ||
1596 | /* We don't need (or want) to use the transactional | |
1597 | * bdrv_reopen_multiple() across all the entries at once, because we | |
1598 | * don't want to abort all of them if one of them fails the reopen */ | |
1599 | if (!qatomic_read(&state->old_bs->copy_on_read)) { | |
1600 | bdrv_reopen_set_read_only(state->old_bs, true, NULL); | |
1601 | } | |
1602 | ||
1603 | aio_context_release(aio_context); | |
1604 | } | |
1605 | ||
1606 | static void external_snapshot_abort(BlkActionState *common) | |
1607 | { | |
1608 | ExternalSnapshotState *state = | |
1609 | DO_UPCAST(ExternalSnapshotState, common, common); | |
1610 | if (state->new_bs) { | |
1611 | if (state->overlay_appended) { | |
1612 | AioContext *aio_context; | |
1613 | AioContext *tmp_context; | |
1614 | int ret; | |
1615 | ||
1616 | aio_context = bdrv_get_aio_context(state->old_bs); | |
1617 | aio_context_acquire(aio_context); | |
1618 | ||
1619 | bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() | |
1620 | close state->old_bs; we need it */ | |
1621 | bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); | |
1622 | ||
1623 | /* | |
1624 | * The call to bdrv_set_backing_hd() above returns state->old_bs to | |
1625 | * the main AioContext. As we're still going to be using it, return | |
1626 | * it to the AioContext it was before. | |
1627 | */ | |
1628 | tmp_context = bdrv_get_aio_context(state->old_bs); | |
1629 | if (aio_context != tmp_context) { | |
1630 | aio_context_release(aio_context); | |
1631 | aio_context_acquire(tmp_context); | |
1632 | ||
1633 | ret = bdrv_try_change_aio_context(state->old_bs, | |
1634 | aio_context, NULL, NULL); | |
1635 | assert(ret == 0); | |
1636 | ||
1637 | aio_context_release(tmp_context); | |
1638 | aio_context_acquire(aio_context); | |
1639 | } | |
1640 | ||
1641 | bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); | |
1642 | bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ | |
1643 | ||
1644 | aio_context_release(aio_context); | |
1645 | } | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | static void external_snapshot_clean(BlkActionState *common) | |
1650 | { | |
1651 | ExternalSnapshotState *state = | |
1652 | DO_UPCAST(ExternalSnapshotState, common, common); | |
1653 | AioContext *aio_context; | |
1654 | ||
1655 | if (!state->old_bs) { | |
1656 | return; | |
1657 | } | |
1658 | ||
1659 | aio_context = bdrv_get_aio_context(state->old_bs); | |
1660 | aio_context_acquire(aio_context); | |
1661 | ||
1662 | bdrv_drained_end(state->old_bs); | |
1663 | bdrv_unref(state->new_bs); | |
1664 | ||
1665 | aio_context_release(aio_context); | |
1666 | } | |
1667 | ||
1668 | typedef struct DriveBackupState { | |
1669 | BlkActionState common; | |
1670 | BlockDriverState *bs; | |
1671 | BlockJob *job; | |
1672 | } DriveBackupState; | |
1673 | ||
1674 | static BlockJob *do_backup_common(BackupCommon *backup, | |
1675 | BlockDriverState *bs, | |
1676 | BlockDriverState *target_bs, | |
1677 | AioContext *aio_context, | |
1678 | JobTxn *txn, Error **errp); | |
1679 | ||
1680 | static void drive_backup_prepare(BlkActionState *common, Error **errp) | |
1681 | { | |
1682 | DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); | |
1683 | DriveBackup *backup; | |
1684 | BlockDriverState *bs; | |
1685 | BlockDriverState *target_bs; | |
1686 | BlockDriverState *source = NULL; | |
1687 | AioContext *aio_context; | |
1688 | AioContext *old_context; | |
1689 | QDict *options; | |
1690 | Error *local_err = NULL; | |
1691 | int flags; | |
1692 | int64_t size; | |
1693 | bool set_backing_hd = false; | |
1694 | int ret; | |
1695 | ||
1696 | assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); | |
1697 | backup = common->action->u.drive_backup.data; | |
1698 | ||
1699 | if (!backup->has_mode) { | |
1700 | backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; | |
1701 | } | |
1702 | ||
1703 | bs = bdrv_lookup_bs(backup->device, backup->device, errp); | |
1704 | if (!bs) { | |
1705 | return; | |
1706 | } | |
1707 | ||
1708 | if (!bs->drv) { | |
1709 | error_setg(errp, "Device has no medium"); | |
1710 | return; | |
1711 | } | |
1712 | ||
1713 | aio_context = bdrv_get_aio_context(bs); | |
1714 | aio_context_acquire(aio_context); | |
1715 | ||
1716 | state->bs = bs; | |
1717 | /* Paired with .clean() */ | |
1718 | bdrv_drained_begin(bs); | |
1719 | ||
1720 | if (!backup->has_format) { | |
1721 | backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? | |
1722 | NULL : (char *) bs->drv->format_name; | |
1723 | } | |
1724 | ||
1725 | /* Early check to avoid creating target */ | |
1726 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { | |
1727 | goto out; | |
1728 | } | |
1729 | ||
1730 | flags = bs->open_flags | BDRV_O_RDWR; | |
1731 | ||
1732 | /* | |
1733 | * See if we have a backing HD we can use to create our new image | |
1734 | * on top of. | |
1735 | */ | |
1736 | if (backup->sync == MIRROR_SYNC_MODE_TOP) { | |
1737 | /* | |
1738 | * Backup will not replace the source by the target, so none | |
1739 | * of the filters skipped here will be removed (in contrast to | |
1740 | * mirror). Therefore, we can skip all of them when looking | |
1741 | * for the first COW relationship. | |
1742 | */ | |
1743 | source = bdrv_cow_bs(bdrv_skip_filters(bs)); | |
1744 | if (!source) { | |
1745 | backup->sync = MIRROR_SYNC_MODE_FULL; | |
1746 | } | |
1747 | } | |
1748 | if (backup->sync == MIRROR_SYNC_MODE_NONE) { | |
1749 | source = bs; | |
1750 | flags |= BDRV_O_NO_BACKING; | |
1751 | set_backing_hd = true; | |
1752 | } | |
1753 | ||
1754 | size = bdrv_getlength(bs); | |
1755 | if (size < 0) { | |
1756 | error_setg_errno(errp, -size, "bdrv_getlength failed"); | |
1757 | goto out; | |
1758 | } | |
1759 | ||
1760 | if (backup->mode != NEW_IMAGE_MODE_EXISTING) { | |
1761 | assert(backup->format); | |
1762 | if (source) { | |
1763 | /* Implicit filters should not appear in the filename */ | |
1764 | BlockDriverState *explicit_backing = | |
1765 | bdrv_skip_implicit_filters(source); | |
1766 | ||
1767 | bdrv_refresh_filename(explicit_backing); | |
1768 | bdrv_img_create(backup->target, backup->format, | |
1769 | explicit_backing->filename, | |
1770 | explicit_backing->drv->format_name, NULL, | |
1771 | size, flags, false, &local_err); | |
1772 | } else { | |
1773 | bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, | |
1774 | size, flags, false, &local_err); | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | if (local_err) { | |
1779 | error_propagate(errp, local_err); | |
1780 | goto out; | |
1781 | } | |
1782 | ||
1783 | options = qdict_new(); | |
1784 | qdict_put_str(options, "discard", "unmap"); | |
1785 | qdict_put_str(options, "detect-zeroes", "unmap"); | |
1786 | if (backup->format) { | |
1787 | qdict_put_str(options, "driver", backup->format); | |
1788 | } | |
1789 | ||
1790 | target_bs = bdrv_open(backup->target, NULL, options, flags, errp); | |
1791 | if (!target_bs) { | |
1792 | goto out; | |
1793 | } | |
1794 | ||
1795 | /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ | |
1796 | old_context = bdrv_get_aio_context(target_bs); | |
1797 | aio_context_release(aio_context); | |
1798 | aio_context_acquire(old_context); | |
1799 | ||
1800 | ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); | |
1801 | if (ret < 0) { | |
1802 | bdrv_unref(target_bs); | |
1803 | aio_context_release(old_context); | |
1804 | return; | |
1805 | } | |
1806 | ||
1807 | aio_context_release(old_context); | |
1808 | aio_context_acquire(aio_context); | |
1809 | ||
1810 | if (set_backing_hd) { | |
1811 | if (bdrv_set_backing_hd(target_bs, source, errp) < 0) { | |
1812 | goto unref; | |
1813 | } | |
1814 | } | |
1815 | ||
1816 | state->job = do_backup_common(qapi_DriveBackup_base(backup), | |
1817 | bs, target_bs, aio_context, | |
1818 | common->block_job_txn, errp); | |
1819 | ||
1820 | unref: | |
1821 | bdrv_unref(target_bs); | |
1822 | out: | |
1823 | aio_context_release(aio_context); | |
1824 | } | |
1825 | ||
1826 | static void drive_backup_commit(BlkActionState *common) | |
1827 | { | |
1828 | DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); | |
1829 | AioContext *aio_context; | |
1830 | ||
1831 | aio_context = bdrv_get_aio_context(state->bs); | |
1832 | aio_context_acquire(aio_context); | |
1833 | ||
1834 | assert(state->job); | |
1835 | job_start(&state->job->job); | |
1836 | ||
1837 | aio_context_release(aio_context); | |
1838 | } | |
1839 | ||
1840 | static void drive_backup_abort(BlkActionState *common) | |
1841 | { | |
1842 | DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); | |
1843 | ||
1844 | if (state->job) { | |
1845 | job_cancel_sync(&state->job->job, true); | |
1846 | } | |
1847 | } | |
1848 | ||
1849 | static void drive_backup_clean(BlkActionState *common) | |
1850 | { | |
1851 | DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); | |
1852 | AioContext *aio_context; | |
1853 | ||
1854 | if (!state->bs) { | |
1855 | return; | |
1856 | } | |
1857 | ||
1858 | aio_context = bdrv_get_aio_context(state->bs); | |
1859 | aio_context_acquire(aio_context); | |
1860 | ||
1861 | bdrv_drained_end(state->bs); | |
1862 | ||
1863 | aio_context_release(aio_context); | |
1864 | } | |
1865 | ||
1866 | typedef struct BlockdevBackupState { | |
1867 | BlkActionState common; | |
1868 | BlockDriverState *bs; | |
1869 | BlockJob *job; | |
1870 | } BlockdevBackupState; | |
1871 | ||
1872 | static void blockdev_backup_prepare(BlkActionState *common, Error **errp) | |
1873 | { | |
1874 | BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); | |
1875 | BlockdevBackup *backup; | |
1876 | BlockDriverState *bs; | |
1877 | BlockDriverState *target_bs; | |
1878 | AioContext *aio_context; | |
1879 | AioContext *old_context; | |
1880 | int ret; | |
1881 | ||
1882 | assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); | |
1883 | backup = common->action->u.blockdev_backup.data; | |
1884 | ||
1885 | bs = bdrv_lookup_bs(backup->device, backup->device, errp); | |
1886 | if (!bs) { | |
1887 | return; | |
1888 | } | |
1889 | ||
1890 | target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); | |
1891 | if (!target_bs) { | |
1892 | return; | |
1893 | } | |
1894 | ||
1895 | /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ | |
1896 | aio_context = bdrv_get_aio_context(bs); | |
1897 | old_context = bdrv_get_aio_context(target_bs); | |
1898 | aio_context_acquire(old_context); | |
1899 | ||
1900 | ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); | |
1901 | if (ret < 0) { | |
1902 | aio_context_release(old_context); | |
1903 | return; | |
1904 | } | |
1905 | ||
1906 | aio_context_release(old_context); | |
1907 | aio_context_acquire(aio_context); | |
1908 | state->bs = bs; | |
1909 | ||
1910 | /* Paired with .clean() */ | |
1911 | bdrv_drained_begin(state->bs); | |
1912 | ||
1913 | state->job = do_backup_common(qapi_BlockdevBackup_base(backup), | |
1914 | bs, target_bs, aio_context, | |
1915 | common->block_job_txn, errp); | |
1916 | ||
1917 | aio_context_release(aio_context); | |
1918 | } | |
1919 | ||
1920 | static void blockdev_backup_commit(BlkActionState *common) | |
1921 | { | |
1922 | BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); | |
1923 | AioContext *aio_context; | |
1924 | ||
1925 | aio_context = bdrv_get_aio_context(state->bs); | |
1926 | aio_context_acquire(aio_context); | |
1927 | ||
1928 | assert(state->job); | |
1929 | job_start(&state->job->job); | |
1930 | ||
1931 | aio_context_release(aio_context); | |
1932 | } | |
1933 | ||
1934 | static void blockdev_backup_abort(BlkActionState *common) | |
1935 | { | |
1936 | BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); | |
1937 | ||
1938 | if (state->job) { | |
1939 | job_cancel_sync(&state->job->job, true); | |
1940 | } | |
1941 | } | |
1942 | ||
1943 | static void blockdev_backup_clean(BlkActionState *common) | |
1944 | { | |
1945 | BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); | |
1946 | AioContext *aio_context; | |
1947 | ||
1948 | if (!state->bs) { | |
1949 | return; | |
1950 | } | |
1951 | ||
1952 | aio_context = bdrv_get_aio_context(state->bs); | |
1953 | aio_context_acquire(aio_context); | |
1954 | ||
1955 | bdrv_drained_end(state->bs); | |
1956 | ||
1957 | aio_context_release(aio_context); | |
1958 | } | |
1959 | ||
1960 | typedef struct BlockDirtyBitmapState { | |
1961 | BlkActionState common; | |
1962 | BdrvDirtyBitmap *bitmap; | |
1963 | BlockDriverState *bs; | |
1964 | HBitmap *backup; | |
1965 | bool prepared; | |
1966 | bool was_enabled; | |
1967 | } BlockDirtyBitmapState; | |
1968 | ||
1969 | static void block_dirty_bitmap_add_prepare(BlkActionState *common, | |
1970 | Error **errp) | |
1971 | { | |
1972 | Error *local_err = NULL; | |
1973 | BlockDirtyBitmapAdd *action; | |
1974 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
1975 | common, common); | |
1976 | ||
1977 | if (action_check_completion_mode(common, errp) < 0) { | |
1978 | return; | |
1979 | } | |
1980 | ||
1981 | action = common->action->u.block_dirty_bitmap_add.data; | |
1982 | /* AIO context taken and released within qmp_block_dirty_bitmap_add */ | |
1983 | qmp_block_dirty_bitmap_add(action->node, action->name, | |
1984 | action->has_granularity, action->granularity, | |
1985 | action->has_persistent, action->persistent, | |
1986 | action->has_disabled, action->disabled, | |
1987 | &local_err); | |
1988 | ||
1989 | if (!local_err) { | |
1990 | state->prepared = true; | |
1991 | } else { | |
1992 | error_propagate(errp, local_err); | |
1993 | } | |
1994 | } | |
1995 | ||
1996 | static void block_dirty_bitmap_add_abort(BlkActionState *common) | |
1997 | { | |
1998 | BlockDirtyBitmapAdd *action; | |
1999 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2000 | common, common); | |
2001 | ||
2002 | action = common->action->u.block_dirty_bitmap_add.data; | |
2003 | /* Should not be able to fail: IF the bitmap was added via .prepare(), | |
2004 | * then the node reference and bitmap name must have been valid. | |
2005 | */ | |
2006 | if (state->prepared) { | |
2007 | qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); | |
2008 | } | |
2009 | } | |
2010 | ||
2011 | static void block_dirty_bitmap_clear_prepare(BlkActionState *common, | |
2012 | Error **errp) | |
2013 | { | |
2014 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2015 | common, common); | |
2016 | BlockDirtyBitmap *action; | |
2017 | ||
2018 | if (action_check_completion_mode(common, errp) < 0) { | |
2019 | return; | |
2020 | } | |
2021 | ||
2022 | action = common->action->u.block_dirty_bitmap_clear.data; | |
2023 | state->bitmap = block_dirty_bitmap_lookup(action->node, | |
2024 | action->name, | |
2025 | &state->bs, | |
2026 | errp); | |
2027 | if (!state->bitmap) { | |
2028 | return; | |
2029 | } | |
2030 | ||
2031 | if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { | |
2032 | return; | |
2033 | } | |
2034 | ||
2035 | bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); | |
2036 | } | |
2037 | ||
2038 | static void block_dirty_bitmap_restore(BlkActionState *common) | |
2039 | { | |
2040 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2041 | common, common); | |
2042 | ||
2043 | if (state->backup) { | |
2044 | bdrv_restore_dirty_bitmap(state->bitmap, state->backup); | |
2045 | } | |
2046 | } | |
2047 | ||
2048 | static void block_dirty_bitmap_free_backup(BlkActionState *common) | |
2049 | { | |
2050 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2051 | common, common); | |
2052 | ||
2053 | hbitmap_free(state->backup); | |
2054 | } | |
2055 | ||
2056 | static void block_dirty_bitmap_enable_prepare(BlkActionState *common, | |
2057 | Error **errp) | |
2058 | { | |
2059 | BlockDirtyBitmap *action; | |
2060 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2061 | common, common); | |
2062 | ||
2063 | if (action_check_completion_mode(common, errp) < 0) { | |
2064 | return; | |
2065 | } | |
2066 | ||
2067 | action = common->action->u.block_dirty_bitmap_enable.data; | |
2068 | state->bitmap = block_dirty_bitmap_lookup(action->node, | |
2069 | action->name, | |
2070 | NULL, | |
2071 | errp); | |
2072 | if (!state->bitmap) { | |
2073 | return; | |
2074 | } | |
2075 | ||
2076 | if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { | |
2077 | return; | |
2078 | } | |
2079 | ||
2080 | state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); | |
2081 | bdrv_enable_dirty_bitmap(state->bitmap); | |
2082 | } | |
2083 | ||
2084 | static void block_dirty_bitmap_enable_abort(BlkActionState *common) | |
2085 | { | |
2086 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2087 | common, common); | |
2088 | ||
2089 | if (!state->was_enabled) { | |
2090 | bdrv_disable_dirty_bitmap(state->bitmap); | |
2091 | } | |
2092 | } | |
2093 | ||
2094 | static void block_dirty_bitmap_disable_prepare(BlkActionState *common, | |
2095 | Error **errp) | |
2096 | { | |
2097 | BlockDirtyBitmap *action; | |
2098 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2099 | common, common); | |
2100 | ||
2101 | if (action_check_completion_mode(common, errp) < 0) { | |
2102 | return; | |
2103 | } | |
2104 | ||
2105 | action = common->action->u.block_dirty_bitmap_disable.data; | |
2106 | state->bitmap = block_dirty_bitmap_lookup(action->node, | |
2107 | action->name, | |
2108 | NULL, | |
2109 | errp); | |
2110 | if (!state->bitmap) { | |
2111 | return; | |
2112 | } | |
2113 | ||
2114 | if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { | |
2115 | return; | |
2116 | } | |
2117 | ||
2118 | state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); | |
2119 | bdrv_disable_dirty_bitmap(state->bitmap); | |
2120 | } | |
2121 | ||
2122 | static void block_dirty_bitmap_disable_abort(BlkActionState *common) | |
2123 | { | |
2124 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2125 | common, common); | |
2126 | ||
2127 | if (state->was_enabled) { | |
2128 | bdrv_enable_dirty_bitmap(state->bitmap); | |
2129 | } | |
2130 | } | |
2131 | ||
2132 | static void block_dirty_bitmap_merge_prepare(BlkActionState *common, | |
2133 | Error **errp) | |
2134 | { | |
2135 | BlockDirtyBitmapMerge *action; | |
2136 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2137 | common, common); | |
2138 | ||
2139 | if (action_check_completion_mode(common, errp) < 0) { | |
2140 | return; | |
2141 | } | |
2142 | ||
2143 | action = common->action->u.block_dirty_bitmap_merge.data; | |
2144 | ||
2145 | state->bitmap = block_dirty_bitmap_merge(action->node, action->target, | |
2146 | action->bitmaps, &state->backup, | |
2147 | errp); | |
2148 | } | |
2149 | ||
2150 | static void block_dirty_bitmap_remove_prepare(BlkActionState *common, | |
2151 | Error **errp) | |
2152 | { | |
2153 | BlockDirtyBitmap *action; | |
2154 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2155 | common, common); | |
2156 | ||
2157 | if (action_check_completion_mode(common, errp) < 0) { | |
2158 | return; | |
2159 | } | |
2160 | ||
2161 | action = common->action->u.block_dirty_bitmap_remove.data; | |
2162 | ||
2163 | state->bitmap = block_dirty_bitmap_remove(action->node, action->name, | |
2164 | false, &state->bs, errp); | |
2165 | if (state->bitmap) { | |
2166 | bdrv_dirty_bitmap_skip_store(state->bitmap, true); | |
2167 | bdrv_dirty_bitmap_set_busy(state->bitmap, true); | |
2168 | } | |
2169 | } | |
2170 | ||
2171 | static void block_dirty_bitmap_remove_abort(BlkActionState *common) | |
2172 | { | |
2173 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2174 | common, common); | |
2175 | ||
2176 | if (state->bitmap) { | |
2177 | bdrv_dirty_bitmap_skip_store(state->bitmap, false); | |
2178 | bdrv_dirty_bitmap_set_busy(state->bitmap, false); | |
2179 | } | |
2180 | } | |
2181 | ||
2182 | static void block_dirty_bitmap_remove_commit(BlkActionState *common) | |
2183 | { | |
2184 | BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, | |
2185 | common, common); | |
2186 | ||
2187 | bdrv_dirty_bitmap_set_busy(state->bitmap, false); | |
2188 | bdrv_release_dirty_bitmap(state->bitmap); | |
2189 | } | |
2190 | ||
2191 | static void abort_prepare(BlkActionState *common, Error **errp) | |
2192 | { | |
2193 | error_setg(errp, "Transaction aborted using Abort action"); | |
2194 | } | |
2195 | ||
2196 | static void abort_commit(BlkActionState *common) | |
2197 | { | |
2198 | g_assert_not_reached(); /* this action never succeeds */ | |
2199 | } | |
2200 | ||
2201 | static const BlkActionOps actions[] = { | |
2202 | [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { | |
2203 | .instance_size = sizeof(ExternalSnapshotState), | |
2204 | .prepare = external_snapshot_prepare, | |
2205 | .commit = external_snapshot_commit, | |
2206 | .abort = external_snapshot_abort, | |
2207 | .clean = external_snapshot_clean, | |
2208 | }, | |
2209 | [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { | |
2210 | .instance_size = sizeof(ExternalSnapshotState), | |
2211 | .prepare = external_snapshot_prepare, | |
2212 | .commit = external_snapshot_commit, | |
2213 | .abort = external_snapshot_abort, | |
2214 | .clean = external_snapshot_clean, | |
2215 | }, | |
2216 | [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { | |
2217 | .instance_size = sizeof(DriveBackupState), | |
2218 | .prepare = drive_backup_prepare, | |
2219 | .commit = drive_backup_commit, | |
2220 | .abort = drive_backup_abort, | |
2221 | .clean = drive_backup_clean, | |
2222 | }, | |
2223 | [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { | |
2224 | .instance_size = sizeof(BlockdevBackupState), | |
2225 | .prepare = blockdev_backup_prepare, | |
2226 | .commit = blockdev_backup_commit, | |
2227 | .abort = blockdev_backup_abort, | |
2228 | .clean = blockdev_backup_clean, | |
2229 | }, | |
2230 | [TRANSACTION_ACTION_KIND_ABORT] = { | |
2231 | .instance_size = sizeof(BlkActionState), | |
2232 | .prepare = abort_prepare, | |
2233 | .commit = abort_commit, | |
2234 | }, | |
2235 | [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { | |
2236 | .instance_size = sizeof(InternalSnapshotState), | |
2237 | .prepare = internal_snapshot_prepare, | |
2238 | .abort = internal_snapshot_abort, | |
2239 | .clean = internal_snapshot_clean, | |
2240 | }, | |
2241 | [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { | |
2242 | .instance_size = sizeof(BlockDirtyBitmapState), | |
2243 | .prepare = block_dirty_bitmap_add_prepare, | |
2244 | .abort = block_dirty_bitmap_add_abort, | |
2245 | }, | |
2246 | [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { | |
2247 | .instance_size = sizeof(BlockDirtyBitmapState), | |
2248 | .prepare = block_dirty_bitmap_clear_prepare, | |
2249 | .commit = block_dirty_bitmap_free_backup, | |
2250 | .abort = block_dirty_bitmap_restore, | |
2251 | }, | |
2252 | [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = { | |
2253 | .instance_size = sizeof(BlockDirtyBitmapState), | |
2254 | .prepare = block_dirty_bitmap_enable_prepare, | |
2255 | .abort = block_dirty_bitmap_enable_abort, | |
2256 | }, | |
2257 | [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = { | |
2258 | .instance_size = sizeof(BlockDirtyBitmapState), | |
2259 | .prepare = block_dirty_bitmap_disable_prepare, | |
2260 | .abort = block_dirty_bitmap_disable_abort, | |
2261 | }, | |
2262 | [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = { | |
2263 | .instance_size = sizeof(BlockDirtyBitmapState), | |
2264 | .prepare = block_dirty_bitmap_merge_prepare, | |
2265 | .commit = block_dirty_bitmap_free_backup, | |
2266 | .abort = block_dirty_bitmap_restore, | |
2267 | }, | |
2268 | [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE] = { | |
2269 | .instance_size = sizeof(BlockDirtyBitmapState), | |
2270 | .prepare = block_dirty_bitmap_remove_prepare, | |
2271 | .commit = block_dirty_bitmap_remove_commit, | |
2272 | .abort = block_dirty_bitmap_remove_abort, | |
2273 | }, | |
2274 | /* Where are transactions for MIRROR, COMMIT and STREAM? | |
2275 | * Although these blockjobs use transaction callbacks like the backup job, | |
2276 | * these jobs do not necessarily adhere to transaction semantics. | |
2277 | * These jobs may not fully undo all of their actions on abort, nor do they | |
2278 | * necessarily work in transactions with more than one job in them. | |
2279 | */ | |
2280 | }; | |
2281 | ||
2282 | /** | |
2283 | * Allocate a TransactionProperties structure if necessary, and fill | |
2284 | * that structure with desired defaults if they are unset. | |
2285 | */ | |
2286 | static TransactionProperties *get_transaction_properties( | |
2287 | TransactionProperties *props) | |
2288 | { | |
2289 | if (!props) { | |
2290 | props = g_new0(TransactionProperties, 1); | |
2291 | } | |
2292 | ||
2293 | if (!props->has_completion_mode) { | |
2294 | props->has_completion_mode = true; | |
2295 | props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; | |
2296 | } | |
2297 | ||
2298 | return props; | |
2299 | } | |
2300 | ||
2301 | /* | |
2302 | * 'Atomic' group operations. The operations are performed as a set, and if | |
2303 | * any fail then we roll back all operations in the group. | |
2304 | * | |
2305 | * Always run under BQL. | |
2306 | */ | |
2307 | void qmp_transaction(TransactionActionList *dev_list, | |
2308 | bool has_props, | |
2309 | struct TransactionProperties *props, | |
2310 | Error **errp) | |
2311 | { | |
2312 | TransactionActionList *dev_entry = dev_list; | |
2313 | JobTxn *block_job_txn = NULL; | |
2314 | BlkActionState *state, *next; | |
2315 | Error *local_err = NULL; | |
2316 | ||
2317 | GLOBAL_STATE_CODE(); | |
2318 | ||
2319 | QTAILQ_HEAD(, BlkActionState) snap_bdrv_states; | |
2320 | QTAILQ_INIT(&snap_bdrv_states); | |
2321 | ||
2322 | /* Does this transaction get canceled as a group on failure? | |
2323 | * If not, we don't really need to make a JobTxn. | |
2324 | */ | |
2325 | props = get_transaction_properties(props); | |
2326 | if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { | |
2327 | block_job_txn = job_txn_new(); | |
2328 | } | |
2329 | ||
2330 | /* drain all i/o before any operations */ | |
2331 | bdrv_drain_all(); | |
2332 | ||
2333 | /* We don't do anything in this loop that commits us to the operations */ | |
2334 | while (NULL != dev_entry) { | |
2335 | TransactionAction *dev_info = NULL; | |
2336 | const BlkActionOps *ops; | |
2337 | ||
2338 | dev_info = dev_entry->value; | |
2339 | dev_entry = dev_entry->next; | |
2340 | ||
2341 | assert(dev_info->type < ARRAY_SIZE(actions)); | |
2342 | ||
2343 | ops = &actions[dev_info->type]; | |
2344 | assert(ops->instance_size > 0); | |
2345 | ||
2346 | state = g_malloc0(ops->instance_size); | |
2347 | state->ops = ops; | |
2348 | state->action = dev_info; | |
2349 | state->block_job_txn = block_job_txn; | |
2350 | state->txn_props = props; | |
2351 | QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry); | |
2352 | ||
2353 | state->ops->prepare(state, &local_err); | |
2354 | if (local_err) { | |
2355 | error_propagate(errp, local_err); | |
2356 | goto delete_and_fail; | |
2357 | } | |
2358 | } | |
2359 | ||
2360 | QTAILQ_FOREACH(state, &snap_bdrv_states, entry) { | |
2361 | if (state->ops->commit) { | |
2362 | state->ops->commit(state); | |
2363 | } | |
2364 | } | |
2365 | ||
2366 | /* success */ | |
2367 | goto exit; | |
2368 | ||
2369 | delete_and_fail: | |
2370 | /* failure, and it is all-or-none; roll back all operations */ | |
2371 | QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) { | |
2372 | if (state->ops->abort) { | |
2373 | state->ops->abort(state); | |
2374 | } | |
2375 | } | |
2376 | exit: | |
2377 | QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { | |
2378 | if (state->ops->clean) { | |
2379 | state->ops->clean(state); | |
2380 | } | |
2381 | g_free(state); | |
2382 | } | |
2383 | if (!has_props) { | |
2384 | qapi_free_TransactionProperties(props); | |
2385 | } | |
2386 | job_txn_unref(block_job_txn); | |
2387 | } | |
2388 | ||
2389 | BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, | |
2390 | const char *name, | |
2391 | Error **errp) | |
2392 | { | |
2393 | BdrvDirtyBitmap *bitmap; | |
2394 | BlockDriverState *bs; | |
2395 | BlockDirtyBitmapSha256 *ret = NULL; | |
2396 | char *sha256; | |
2397 | ||
2398 | bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); | |
2399 | if (!bitmap || !bs) { | |
2400 | return NULL; | |
2401 | } | |
2402 | ||
2403 | sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); | |
2404 | if (sha256 == NULL) { | |
2405 | return NULL; | |
2406 | } | |
2407 | ||
2408 | ret = g_new(BlockDirtyBitmapSha256, 1); | |
2409 | ret->sha256 = sha256; | |
2410 | ||
2411 | return ret; | |
2412 | } | |
2413 | ||
2414 | void coroutine_fn qmp_block_resize(bool has_device, const char *device, | |
2415 | bool has_node_name, const char *node_name, | |
2416 | int64_t size, Error **errp) | |
2417 | { | |
2418 | Error *local_err = NULL; | |
2419 | BlockBackend *blk; | |
2420 | BlockDriverState *bs; | |
2421 | AioContext *old_ctx; | |
2422 | ||
2423 | bs = bdrv_lookup_bs(has_device ? device : NULL, | |
2424 | has_node_name ? node_name : NULL, | |
2425 | &local_err); | |
2426 | if (local_err) { | |
2427 | error_propagate(errp, local_err); | |
2428 | return; | |
2429 | } | |
2430 | ||
2431 | if (size < 0) { | |
2432 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); | |
2433 | return; | |
2434 | } | |
2435 | ||
2436 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { | |
2437 | error_setg(errp, QERR_DEVICE_IN_USE, device); | |
2438 | return; | |
2439 | } | |
2440 | ||
2441 | blk = blk_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp); | |
2442 | if (!blk) { | |
2443 | return; | |
2444 | } | |
2445 | ||
2446 | bdrv_co_lock(bs); | |
2447 | bdrv_drained_begin(bs); | |
2448 | bdrv_co_unlock(bs); | |
2449 | ||
2450 | old_ctx = bdrv_co_enter(bs); | |
2451 | blk_co_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp); | |
2452 | bdrv_co_leave(bs, old_ctx); | |
2453 | ||
2454 | bdrv_co_lock(bs); | |
2455 | bdrv_drained_end(bs); | |
2456 | blk_unref(blk); | |
2457 | bdrv_co_unlock(bs); | |
2458 | } | |
2459 | ||
2460 | void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, | |
2461 | bool has_base, const char *base, | |
2462 | bool has_base_node, const char *base_node, | |
2463 | bool has_backing_file, const char *backing_file, | |
2464 | bool has_bottom, const char *bottom, | |
2465 | bool has_speed, int64_t speed, | |
2466 | bool has_on_error, BlockdevOnError on_error, | |
2467 | bool has_filter_node_name, const char *filter_node_name, | |
2468 | bool has_auto_finalize, bool auto_finalize, | |
2469 | bool has_auto_dismiss, bool auto_dismiss, | |
2470 | Error **errp) | |
2471 | { | |
2472 | BlockDriverState *bs, *iter, *iter_end; | |
2473 | BlockDriverState *base_bs = NULL; | |
2474 | BlockDriverState *bottom_bs = NULL; | |
2475 | AioContext *aio_context; | |
2476 | Error *local_err = NULL; | |
2477 | int job_flags = JOB_DEFAULT; | |
2478 | ||
2479 | if (has_base && has_base_node) { | |
2480 | error_setg(errp, "'base' and 'base-node' cannot be specified " | |
2481 | "at the same time"); | |
2482 | return; | |
2483 | } | |
2484 | ||
2485 | if (has_base && has_bottom) { | |
2486 | error_setg(errp, "'base' and 'bottom' cannot be specified " | |
2487 | "at the same time"); | |
2488 | return; | |
2489 | } | |
2490 | ||
2491 | if (has_bottom && has_base_node) { | |
2492 | error_setg(errp, "'bottom' and 'base-node' cannot be specified " | |
2493 | "at the same time"); | |
2494 | return; | |
2495 | } | |
2496 | ||
2497 | if (!has_on_error) { | |
2498 | on_error = BLOCKDEV_ON_ERROR_REPORT; | |
2499 | } | |
2500 | ||
2501 | bs = bdrv_lookup_bs(device, device, errp); | |
2502 | if (!bs) { | |
2503 | return; | |
2504 | } | |
2505 | ||
2506 | aio_context = bdrv_get_aio_context(bs); | |
2507 | aio_context_acquire(aio_context); | |
2508 | ||
2509 | if (has_base) { | |
2510 | base_bs = bdrv_find_backing_image(bs, base); | |
2511 | if (base_bs == NULL) { | |
2512 | error_setg(errp, "Can't find '%s' in the backing chain", base); | |
2513 | goto out; | |
2514 | } | |
2515 | assert(bdrv_get_aio_context(base_bs) == aio_context); | |
2516 | } | |
2517 | ||
2518 | if (has_base_node) { | |
2519 | base_bs = bdrv_lookup_bs(NULL, base_node, errp); | |
2520 | if (!base_bs) { | |
2521 | goto out; | |
2522 | } | |
2523 | if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { | |
2524 | error_setg(errp, "Node '%s' is not a backing image of '%s'", | |
2525 | base_node, device); | |
2526 | goto out; | |
2527 | } | |
2528 | assert(bdrv_get_aio_context(base_bs) == aio_context); | |
2529 | bdrv_refresh_filename(base_bs); | |
2530 | } | |
2531 | ||
2532 | if (has_bottom) { | |
2533 | bottom_bs = bdrv_lookup_bs(NULL, bottom, errp); | |
2534 | if (!bottom_bs) { | |
2535 | goto out; | |
2536 | } | |
2537 | if (!bottom_bs->drv) { | |
2538 | error_setg(errp, "Node '%s' is not open", bottom); | |
2539 | goto out; | |
2540 | } | |
2541 | if (bottom_bs->drv->is_filter) { | |
2542 | error_setg(errp, "Node '%s' is a filter, use a non-filter node " | |
2543 | "as 'bottom'", bottom); | |
2544 | goto out; | |
2545 | } | |
2546 | if (!bdrv_chain_contains(bs, bottom_bs)) { | |
2547 | error_setg(errp, "Node '%s' is not in a chain starting from '%s'", | |
2548 | bottom, device); | |
2549 | goto out; | |
2550 | } | |
2551 | assert(bdrv_get_aio_context(bottom_bs) == aio_context); | |
2552 | } | |
2553 | ||
2554 | /* | |
2555 | * Check for op blockers in the whole chain between bs and base (or bottom) | |
2556 | */ | |
2557 | iter_end = has_bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs; | |
2558 | for (iter = bs; iter && iter != iter_end; | |
2559 | iter = bdrv_filter_or_cow_bs(iter)) | |
2560 | { | |
2561 | if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { | |
2562 | goto out; | |
2563 | } | |
2564 | } | |
2565 | ||
2566 | /* if we are streaming the entire chain, the result will have no backing | |
2567 | * file, and specifying one is therefore an error */ | |
2568 | if (base_bs == NULL && has_backing_file) { | |
2569 | error_setg(errp, "backing file specified, but streaming the " | |
2570 | "entire chain"); | |
2571 | goto out; | |
2572 | } | |
2573 | ||
2574 | if (has_auto_finalize && !auto_finalize) { | |
2575 | job_flags |= JOB_MANUAL_FINALIZE; | |
2576 | } | |
2577 | if (has_auto_dismiss && !auto_dismiss) { | |
2578 | job_flags |= JOB_MANUAL_DISMISS; | |
2579 | } | |
2580 | ||
2581 | stream_start(has_job_id ? job_id : NULL, bs, base_bs, backing_file, | |
2582 | bottom_bs, job_flags, has_speed ? speed : 0, on_error, | |
2583 | filter_node_name, &local_err); | |
2584 | if (local_err) { | |
2585 | error_propagate(errp, local_err); | |
2586 | goto out; | |
2587 | } | |
2588 | ||
2589 | trace_qmp_block_stream(bs); | |
2590 | ||
2591 | out: | |
2592 | aio_context_release(aio_context); | |
2593 | } | |
2594 | ||
2595 | void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, | |
2596 | bool has_base_node, const char *base_node, | |
2597 | bool has_base, const char *base, | |
2598 | bool has_top_node, const char *top_node, | |
2599 | bool has_top, const char *top, | |
2600 | bool has_backing_file, const char *backing_file, | |
2601 | bool has_speed, int64_t speed, | |
2602 | bool has_on_error, BlockdevOnError on_error, | |
2603 | bool has_filter_node_name, const char *filter_node_name, | |
2604 | bool has_auto_finalize, bool auto_finalize, | |
2605 | bool has_auto_dismiss, bool auto_dismiss, | |
2606 | Error **errp) | |
2607 | { | |
2608 | BlockDriverState *bs; | |
2609 | BlockDriverState *iter; | |
2610 | BlockDriverState *base_bs, *top_bs; | |
2611 | AioContext *aio_context; | |
2612 | Error *local_err = NULL; | |
2613 | int job_flags = JOB_DEFAULT; | |
2614 | uint64_t top_perm, top_shared; | |
2615 | ||
2616 | if (!has_speed) { | |
2617 | speed = 0; | |
2618 | } | |
2619 | if (!has_on_error) { | |
2620 | on_error = BLOCKDEV_ON_ERROR_REPORT; | |
2621 | } | |
2622 | if (!has_filter_node_name) { | |
2623 | filter_node_name = NULL; | |
2624 | } | |
2625 | if (has_auto_finalize && !auto_finalize) { | |
2626 | job_flags |= JOB_MANUAL_FINALIZE; | |
2627 | } | |
2628 | if (has_auto_dismiss && !auto_dismiss) { | |
2629 | job_flags |= JOB_MANUAL_DISMISS; | |
2630 | } | |
2631 | ||
2632 | /* Important Note: | |
2633 | * libvirt relies on the DeviceNotFound error class in order to probe for | |
2634 | * live commit feature versions; for this to work, we must make sure to | |
2635 | * perform the device lookup before any generic errors that may occur in a | |
2636 | * scenario in which all optional arguments are omitted. */ | |
2637 | bs = qmp_get_root_bs(device, &local_err); | |
2638 | if (!bs) { | |
2639 | bs = bdrv_lookup_bs(device, device, NULL); | |
2640 | if (!bs) { | |
2641 | error_free(local_err); | |
2642 | error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, | |
2643 | "Device '%s' not found", device); | |
2644 | } else { | |
2645 | error_propagate(errp, local_err); | |
2646 | } | |
2647 | return; | |
2648 | } | |
2649 | ||
2650 | aio_context = bdrv_get_aio_context(bs); | |
2651 | aio_context_acquire(aio_context); | |
2652 | ||
2653 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { | |
2654 | goto out; | |
2655 | } | |
2656 | ||
2657 | /* default top_bs is the active layer */ | |
2658 | top_bs = bs; | |
2659 | ||
2660 | if (has_top_node && has_top) { | |
2661 | error_setg(errp, "'top-node' and 'top' are mutually exclusive"); | |
2662 | goto out; | |
2663 | } else if (has_top_node) { | |
2664 | top_bs = bdrv_lookup_bs(NULL, top_node, errp); | |
2665 | if (top_bs == NULL) { | |
2666 | goto out; | |
2667 | } | |
2668 | if (!bdrv_chain_contains(bs, top_bs)) { | |
2669 | error_setg(errp, "'%s' is not in this backing file chain", | |
2670 | top_node); | |
2671 | goto out; | |
2672 | } | |
2673 | } else if (has_top && top) { | |
2674 | /* This strcmp() is just a shortcut, there is no need to | |
2675 | * refresh @bs's filename. If it mismatches, | |
2676 | * bdrv_find_backing_image() will do the refresh and may still | |
2677 | * return @bs. */ | |
2678 | if (strcmp(bs->filename, top) != 0) { | |
2679 | top_bs = bdrv_find_backing_image(bs, top); | |
2680 | } | |
2681 | } | |
2682 | ||
2683 | if (top_bs == NULL) { | |
2684 | error_setg(errp, "Top image file %s not found", top ? top : "NULL"); | |
2685 | goto out; | |
2686 | } | |
2687 | ||
2688 | assert(bdrv_get_aio_context(top_bs) == aio_context); | |
2689 | ||
2690 | if (has_base_node && has_base) { | |
2691 | error_setg(errp, "'base-node' and 'base' are mutually exclusive"); | |
2692 | goto out; | |
2693 | } else if (has_base_node) { | |
2694 | base_bs = bdrv_lookup_bs(NULL, base_node, errp); | |
2695 | if (base_bs == NULL) { | |
2696 | goto out; | |
2697 | } | |
2698 | if (!bdrv_chain_contains(top_bs, base_bs)) { | |
2699 | error_setg(errp, "'%s' is not in this backing file chain", | |
2700 | base_node); | |
2701 | goto out; | |
2702 | } | |
2703 | } else if (has_base && base) { | |
2704 | base_bs = bdrv_find_backing_image(top_bs, base); | |
2705 | if (base_bs == NULL) { | |
2706 | error_setg(errp, "Can't find '%s' in the backing chain", base); | |
2707 | goto out; | |
2708 | } | |
2709 | } else { | |
2710 | base_bs = bdrv_find_base(top_bs); | |
2711 | if (base_bs == NULL) { | |
2712 | error_setg(errp, "There is no backimg image"); | |
2713 | goto out; | |
2714 | } | |
2715 | } | |
2716 | ||
2717 | assert(bdrv_get_aio_context(base_bs) == aio_context); | |
2718 | ||
2719 | for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs); | |
2720 | iter = bdrv_filter_or_cow_bs(iter)) | |
2721 | { | |
2722 | if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { | |
2723 | goto out; | |
2724 | } | |
2725 | } | |
2726 | ||
2727 | /* Do not allow attempts to commit an image into itself */ | |
2728 | if (top_bs == base_bs) { | |
2729 | error_setg(errp, "cannot commit an image into itself"); | |
2730 | goto out; | |
2731 | } | |
2732 | ||
2733 | /* | |
2734 | * Active commit is required if and only if someone has taken a | |
2735 | * WRITE permission on the top node. Historically, we have always | |
2736 | * used active commit for top nodes, so continue that practice | |
2737 | * lest we possibly break clients that rely on this behavior, e.g. | |
2738 | * to later attach this node to a writing parent. | |
2739 | * (Active commit is never really wrong.) | |
2740 | */ | |
2741 | bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared); | |
2742 | if (top_perm & BLK_PERM_WRITE || | |
2743 | bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) | |
2744 | { | |
2745 | if (has_backing_file) { | |
2746 | if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) { | |
2747 | error_setg(errp, "'backing-file' specified," | |
2748 | " but 'top' is the active layer"); | |
2749 | } else { | |
2750 | error_setg(errp, "'backing-file' specified, but 'top' has a " | |
2751 | "writer on it"); | |
2752 | } | |
2753 | goto out; | |
2754 | } | |
2755 | if (!has_job_id) { | |
2756 | /* | |
2757 | * Emulate here what block_job_create() does, because it | |
2758 | * is possible that @bs != @top_bs (the block job should | |
2759 | * be named after @bs, even if @top_bs is the actual | |
2760 | * source) | |
2761 | */ | |
2762 | job_id = bdrv_get_device_name(bs); | |
2763 | } | |
2764 | commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error, | |
2765 | filter_node_name, NULL, NULL, false, &local_err); | |
2766 | } else { | |
2767 | BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); | |
2768 | if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { | |
2769 | goto out; | |
2770 | } | |
2771 | commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags, | |
2772 | speed, on_error, has_backing_file ? backing_file : NULL, | |
2773 | filter_node_name, &local_err); | |
2774 | } | |
2775 | if (local_err != NULL) { | |
2776 | error_propagate(errp, local_err); | |
2777 | goto out; | |
2778 | } | |
2779 | ||
2780 | out: | |
2781 | aio_context_release(aio_context); | |
2782 | } | |
2783 | ||
2784 | /* Common QMP interface for drive-backup and blockdev-backup */ | |
2785 | static BlockJob *do_backup_common(BackupCommon *backup, | |
2786 | BlockDriverState *bs, | |
2787 | BlockDriverState *target_bs, | |
2788 | AioContext *aio_context, | |
2789 | JobTxn *txn, Error **errp) | |
2790 | { | |
2791 | BlockJob *job = NULL; | |
2792 | BdrvDirtyBitmap *bmap = NULL; | |
2793 | BackupPerf perf = { .max_workers = 64 }; | |
2794 | int job_flags = JOB_DEFAULT; | |
2795 | ||
2796 | if (!backup->has_speed) { | |
2797 | backup->speed = 0; | |
2798 | } | |
2799 | if (!backup->has_on_source_error) { | |
2800 | backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; | |
2801 | } | |
2802 | if (!backup->has_on_target_error) { | |
2803 | backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; | |
2804 | } | |
2805 | if (!backup->has_job_id) { | |
2806 | backup->job_id = NULL; | |
2807 | } | |
2808 | if (!backup->has_auto_finalize) { | |
2809 | backup->auto_finalize = true; | |
2810 | } | |
2811 | if (!backup->has_auto_dismiss) { | |
2812 | backup->auto_dismiss = true; | |
2813 | } | |
2814 | if (!backup->has_compress) { | |
2815 | backup->compress = false; | |
2816 | } | |
2817 | ||
2818 | if (backup->x_perf) { | |
2819 | if (backup->x_perf->has_use_copy_range) { | |
2820 | perf.use_copy_range = backup->x_perf->use_copy_range; | |
2821 | } | |
2822 | if (backup->x_perf->has_max_workers) { | |
2823 | perf.max_workers = backup->x_perf->max_workers; | |
2824 | } | |
2825 | if (backup->x_perf->has_max_chunk) { | |
2826 | perf.max_chunk = backup->x_perf->max_chunk; | |
2827 | } | |
2828 | } | |
2829 | ||
2830 | if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) || | |
2831 | (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) { | |
2832 | /* done before desugaring 'incremental' to print the right message */ | |
2833 | if (!backup->has_bitmap) { | |
2834 | error_setg(errp, "must provide a valid bitmap name for " | |
2835 | "'%s' sync mode", MirrorSyncMode_str(backup->sync)); | |
2836 | return NULL; | |
2837 | } | |
2838 | } | |
2839 | ||
2840 | if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) { | |
2841 | if (backup->has_bitmap_mode && | |
2842 | backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) { | |
2843 | error_setg(errp, "Bitmap sync mode must be '%s' " | |
2844 | "when using sync mode '%s'", | |
2845 | BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS), | |
2846 | MirrorSyncMode_str(backup->sync)); | |
2847 | return NULL; | |
2848 | } | |
2849 | backup->has_bitmap_mode = true; | |
2850 | backup->sync = MIRROR_SYNC_MODE_BITMAP; | |
2851 | backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS; | |
2852 | } | |
2853 | ||
2854 | if (backup->has_bitmap) { | |
2855 | bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); | |
2856 | if (!bmap) { | |
2857 | error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); | |
2858 | return NULL; | |
2859 | } | |
2860 | if (!backup->has_bitmap_mode) { | |
2861 | error_setg(errp, "Bitmap sync mode must be given " | |
2862 | "when providing a bitmap"); | |
2863 | return NULL; | |
2864 | } | |
2865 | if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) { | |
2866 | return NULL; | |
2867 | } | |
2868 | ||
2869 | /* This does not produce a useful bitmap artifact: */ | |
2870 | if (backup->sync == MIRROR_SYNC_MODE_NONE) { | |
2871 | error_setg(errp, "sync mode '%s' does not produce meaningful bitmap" | |
2872 | " outputs", MirrorSyncMode_str(backup->sync)); | |
2873 | return NULL; | |
2874 | } | |
2875 | ||
2876 | /* If the bitmap isn't used for input or output, this is useless: */ | |
2877 | if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER && | |
2878 | backup->sync != MIRROR_SYNC_MODE_BITMAP) { | |
2879 | error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect" | |
2880 | " when combined with sync mode '%s'", | |
2881 | BitmapSyncMode_str(backup->bitmap_mode), | |
2882 | MirrorSyncMode_str(backup->sync)); | |
2883 | return NULL; | |
2884 | } | |
2885 | } | |
2886 | ||
2887 | if (!backup->has_bitmap && backup->has_bitmap_mode) { | |
2888 | error_setg(errp, "Cannot specify bitmap sync mode without a bitmap"); | |
2889 | return NULL; | |
2890 | } | |
2891 | ||
2892 | if (!backup->auto_finalize) { | |
2893 | job_flags |= JOB_MANUAL_FINALIZE; | |
2894 | } | |
2895 | if (!backup->auto_dismiss) { | |
2896 | job_flags |= JOB_MANUAL_DISMISS; | |
2897 | } | |
2898 | ||
2899 | job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, | |
2900 | backup->sync, bmap, backup->bitmap_mode, | |
2901 | backup->compress, | |
2902 | backup->filter_node_name, | |
2903 | &perf, | |
2904 | backup->on_source_error, | |
2905 | backup->on_target_error, | |
2906 | job_flags, NULL, NULL, txn, errp); | |
2907 | return job; | |
2908 | } | |
2909 | ||
2910 | void qmp_drive_backup(DriveBackup *backup, Error **errp) | |
2911 | { | |
2912 | TransactionAction action = { | |
2913 | .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP, | |
2914 | .u.drive_backup.data = backup, | |
2915 | }; | |
2916 | blockdev_do_action(&action, errp); | |
2917 | } | |
2918 | ||
2919 | BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat, | |
2920 | bool flat, | |
2921 | Error **errp) | |
2922 | { | |
2923 | bool return_flat = has_flat && flat; | |
2924 | ||
2925 | return bdrv_named_nodes_list(return_flat, errp); | |
2926 | } | |
2927 | ||
2928 | XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) | |
2929 | { | |
2930 | return bdrv_get_xdbg_block_graph(errp); | |
2931 | } | |
2932 | ||
2933 | void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp) | |
2934 | { | |
2935 | TransactionAction action = { | |
2936 | .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP, | |
2937 | .u.blockdev_backup.data = backup, | |
2938 | }; | |
2939 | blockdev_do_action(&action, errp); | |
2940 | } | |
2941 | ||
2942 | /* Parameter check and block job starting for drive mirroring. | |
2943 | * Caller should hold @device and @target's aio context (must be the same). | |
2944 | **/ | |
2945 | static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, | |
2946 | BlockDriverState *target, | |
2947 | bool has_replaces, const char *replaces, | |
2948 | enum MirrorSyncMode sync, | |
2949 | BlockMirrorBackingMode backing_mode, | |
2950 | bool zero_target, | |
2951 | bool has_speed, int64_t speed, | |
2952 | bool has_granularity, uint32_t granularity, | |
2953 | bool has_buf_size, int64_t buf_size, | |
2954 | bool has_on_source_error, | |
2955 | BlockdevOnError on_source_error, | |
2956 | bool has_on_target_error, | |
2957 | BlockdevOnError on_target_error, | |
2958 | bool has_unmap, bool unmap, | |
2959 | bool has_filter_node_name, | |
2960 | const char *filter_node_name, | |
2961 | bool has_copy_mode, MirrorCopyMode copy_mode, | |
2962 | bool has_auto_finalize, bool auto_finalize, | |
2963 | bool has_auto_dismiss, bool auto_dismiss, | |
2964 | Error **errp) | |
2965 | { | |
2966 | BlockDriverState *unfiltered_bs; | |
2967 | int job_flags = JOB_DEFAULT; | |
2968 | ||
2969 | if (!has_speed) { | |
2970 | speed = 0; | |
2971 | } | |
2972 | if (!has_on_source_error) { | |
2973 | on_source_error = BLOCKDEV_ON_ERROR_REPORT; | |
2974 | } | |
2975 | if (!has_on_target_error) { | |
2976 | on_target_error = BLOCKDEV_ON_ERROR_REPORT; | |
2977 | } | |
2978 | if (!has_granularity) { | |
2979 | granularity = 0; | |
2980 | } | |
2981 | if (!has_buf_size) { | |
2982 | buf_size = 0; | |
2983 | } | |
2984 | if (!has_unmap) { | |
2985 | unmap = true; | |
2986 | } | |
2987 | if (!has_filter_node_name) { | |
2988 | filter_node_name = NULL; | |
2989 | } | |
2990 | if (!has_copy_mode) { | |
2991 | copy_mode = MIRROR_COPY_MODE_BACKGROUND; | |
2992 | } | |
2993 | if (has_auto_finalize && !auto_finalize) { | |
2994 | job_flags |= JOB_MANUAL_FINALIZE; | |
2995 | } | |
2996 | if (has_auto_dismiss && !auto_dismiss) { | |
2997 | job_flags |= JOB_MANUAL_DISMISS; | |
2998 | } | |
2999 | ||
3000 | if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { | |
3001 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", | |
3002 | "a value in range [512B, 64MB]"); | |
3003 | return; | |
3004 | } | |
3005 | if (granularity & (granularity - 1)) { | |
3006 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", | |
3007 | "a power of 2"); | |
3008 | return; | |
3009 | } | |
3010 | ||
3011 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { | |
3012 | return; | |
3013 | } | |
3014 | if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { | |
3015 | return; | |
3016 | } | |
3017 | ||
3018 | if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) { | |
3019 | sync = MIRROR_SYNC_MODE_FULL; | |
3020 | } | |
3021 | ||
3022 | if (!has_replaces) { | |
3023 | /* We want to mirror from @bs, but keep implicit filters on top */ | |
3024 | unfiltered_bs = bdrv_skip_implicit_filters(bs); | |
3025 | if (unfiltered_bs != bs) { | |
3026 | replaces = unfiltered_bs->node_name; | |
3027 | has_replaces = true; | |
3028 | } | |
3029 | } | |
3030 | ||
3031 | if (has_replaces) { | |
3032 | BlockDriverState *to_replace_bs; | |
3033 | AioContext *replace_aio_context; | |
3034 | int64_t bs_size, replace_size; | |
3035 | ||
3036 | bs_size = bdrv_getlength(bs); | |
3037 | if (bs_size < 0) { | |
3038 | error_setg_errno(errp, -bs_size, "Failed to query device's size"); | |
3039 | return; | |
3040 | } | |
3041 | ||
3042 | to_replace_bs = check_to_replace_node(bs, replaces, errp); | |
3043 | if (!to_replace_bs) { | |
3044 | return; | |
3045 | } | |
3046 | ||
3047 | replace_aio_context = bdrv_get_aio_context(to_replace_bs); | |
3048 | aio_context_acquire(replace_aio_context); | |
3049 | replace_size = bdrv_getlength(to_replace_bs); | |
3050 | aio_context_release(replace_aio_context); | |
3051 | ||
3052 | if (replace_size < 0) { | |
3053 | error_setg_errno(errp, -replace_size, | |
3054 | "Failed to query the replacement node's size"); | |
3055 | return; | |
3056 | } | |
3057 | if (bs_size != replace_size) { | |
3058 | error_setg(errp, "cannot replace image with a mirror image of " | |
3059 | "different size"); | |
3060 | return; | |
3061 | } | |
3062 | } | |
3063 | ||
3064 | /* pass the node name to replace to mirror start since it's loose coupling | |
3065 | * and will allow to check whether the node still exist at mirror completion | |
3066 | */ | |
3067 | mirror_start(job_id, bs, target, | |
3068 | has_replaces ? replaces : NULL, job_flags, | |
3069 | speed, granularity, buf_size, sync, backing_mode, zero_target, | |
3070 | on_source_error, on_target_error, unmap, filter_node_name, | |
3071 | copy_mode, errp); | |
3072 | } | |
3073 | ||
3074 | void qmp_drive_mirror(DriveMirror *arg, Error **errp) | |
3075 | { | |
3076 | BlockDriverState *bs; | |
3077 | BlockDriverState *target_backing_bs, *target_bs; | |
3078 | AioContext *aio_context; | |
3079 | AioContext *old_context; | |
3080 | BlockMirrorBackingMode backing_mode; | |
3081 | Error *local_err = NULL; | |
3082 | QDict *options = NULL; | |
3083 | int flags; | |
3084 | int64_t size; | |
3085 | const char *format = arg->format; | |
3086 | bool zero_target; | |
3087 | int ret; | |
3088 | ||
3089 | bs = qmp_get_root_bs(arg->device, errp); | |
3090 | if (!bs) { | |
3091 | return; | |
3092 | } | |
3093 | ||
3094 | /* Early check to avoid creating target */ | |
3095 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { | |
3096 | return; | |
3097 | } | |
3098 | ||
3099 | aio_context = bdrv_get_aio_context(bs); | |
3100 | aio_context_acquire(aio_context); | |
3101 | ||
3102 | if (!arg->has_mode) { | |
3103 | arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; | |
3104 | } | |
3105 | ||
3106 | if (!arg->has_format) { | |
3107 | format = (arg->mode == NEW_IMAGE_MODE_EXISTING | |
3108 | ? NULL : bs->drv->format_name); | |
3109 | } | |
3110 | ||
3111 | flags = bs->open_flags | BDRV_O_RDWR; | |
3112 | target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs)); | |
3113 | if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) { | |
3114 | arg->sync = MIRROR_SYNC_MODE_FULL; | |
3115 | } | |
3116 | if (arg->sync == MIRROR_SYNC_MODE_NONE) { | |
3117 | target_backing_bs = bs; | |
3118 | } | |
3119 | ||
3120 | size = bdrv_getlength(bs); | |
3121 | if (size < 0) { | |
3122 | error_setg_errno(errp, -size, "bdrv_getlength failed"); | |
3123 | goto out; | |
3124 | } | |
3125 | ||
3126 | if (arg->has_replaces) { | |
3127 | if (!arg->has_node_name) { | |
3128 | error_setg(errp, "a node-name must be provided when replacing a" | |
3129 | " named node of the graph"); | |
3130 | goto out; | |
3131 | } | |
3132 | } | |
3133 | ||
3134 | if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { | |
3135 | backing_mode = MIRROR_SOURCE_BACKING_CHAIN; | |
3136 | } else { | |
3137 | backing_mode = MIRROR_OPEN_BACKING_CHAIN; | |
3138 | } | |
3139 | ||
3140 | /* Don't open backing image in create() */ | |
3141 | flags |= BDRV_O_NO_BACKING; | |
3142 | ||
3143 | if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs) | |
3144 | && arg->mode != NEW_IMAGE_MODE_EXISTING) | |
3145 | { | |
3146 | /* create new image w/o backing file */ | |
3147 | assert(format); | |
3148 | bdrv_img_create(arg->target, format, | |
3149 | NULL, NULL, NULL, size, flags, false, &local_err); | |
3150 | } else { | |
3151 | /* Implicit filters should not appear in the filename */ | |
3152 | BlockDriverState *explicit_backing = | |
3153 | bdrv_skip_implicit_filters(target_backing_bs); | |
3154 | ||
3155 | switch (arg->mode) { | |
3156 | case NEW_IMAGE_MODE_EXISTING: | |
3157 | break; | |
3158 | case NEW_IMAGE_MODE_ABSOLUTE_PATHS: | |
3159 | /* create new image with backing file */ | |
3160 | bdrv_refresh_filename(explicit_backing); | |
3161 | bdrv_img_create(arg->target, format, | |
3162 | explicit_backing->filename, | |
3163 | explicit_backing->drv->format_name, | |
3164 | NULL, size, flags, false, &local_err); | |
3165 | break; | |
3166 | default: | |
3167 | abort(); | |
3168 | } | |
3169 | } | |
3170 | ||
3171 | if (local_err) { | |
3172 | error_propagate(errp, local_err); | |
3173 | goto out; | |
3174 | } | |
3175 | ||
3176 | options = qdict_new(); | |
3177 | if (arg->has_node_name) { | |
3178 | qdict_put_str(options, "node-name", arg->node_name); | |
3179 | } | |
3180 | if (format) { | |
3181 | qdict_put_str(options, "driver", format); | |
3182 | } | |
3183 | ||
3184 | /* Mirroring takes care of copy-on-write using the source's backing | |
3185 | * file. | |
3186 | */ | |
3187 | target_bs = bdrv_open(arg->target, NULL, options, flags, errp); | |
3188 | if (!target_bs) { | |
3189 | goto out; | |
3190 | } | |
3191 | ||
3192 | zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL && | |
3193 | (arg->mode == NEW_IMAGE_MODE_EXISTING || | |
3194 | !bdrv_has_zero_init(target_bs))); | |
3195 | ||
3196 | ||
3197 | /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ | |
3198 | old_context = bdrv_get_aio_context(target_bs); | |
3199 | aio_context_release(aio_context); | |
3200 | aio_context_acquire(old_context); | |
3201 | ||
3202 | ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); | |
3203 | if (ret < 0) { | |
3204 | bdrv_unref(target_bs); | |
3205 | aio_context_release(old_context); | |
3206 | return; | |
3207 | } | |
3208 | ||
3209 | aio_context_release(old_context); | |
3210 | aio_context_acquire(aio_context); | |
3211 | ||
3212 | blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, | |
3213 | arg->has_replaces, arg->replaces, arg->sync, | |
3214 | backing_mode, zero_target, | |
3215 | arg->has_speed, arg->speed, | |
3216 | arg->has_granularity, arg->granularity, | |
3217 | arg->has_buf_size, arg->buf_size, | |
3218 | arg->has_on_source_error, arg->on_source_error, | |
3219 | arg->has_on_target_error, arg->on_target_error, | |
3220 | arg->has_unmap, arg->unmap, | |
3221 | false, NULL, | |
3222 | arg->has_copy_mode, arg->copy_mode, | |
3223 | arg->has_auto_finalize, arg->auto_finalize, | |
3224 | arg->has_auto_dismiss, arg->auto_dismiss, | |
3225 | errp); | |
3226 | bdrv_unref(target_bs); | |
3227 | out: | |
3228 | aio_context_release(aio_context); | |
3229 | } | |
3230 | ||
3231 | void qmp_blockdev_mirror(bool has_job_id, const char *job_id, | |
3232 | const char *device, const char *target, | |
3233 | bool has_replaces, const char *replaces, | |
3234 | MirrorSyncMode sync, | |
3235 | bool has_speed, int64_t speed, | |
3236 | bool has_granularity, uint32_t granularity, | |
3237 | bool has_buf_size, int64_t buf_size, | |
3238 | bool has_on_source_error, | |
3239 | BlockdevOnError on_source_error, | |
3240 | bool has_on_target_error, | |
3241 | BlockdevOnError on_target_error, | |
3242 | bool has_filter_node_name, | |
3243 | const char *filter_node_name, | |
3244 | bool has_copy_mode, MirrorCopyMode copy_mode, | |
3245 | bool has_auto_finalize, bool auto_finalize, | |
3246 | bool has_auto_dismiss, bool auto_dismiss, | |
3247 | Error **errp) | |
3248 | { | |
3249 | BlockDriverState *bs; | |
3250 | BlockDriverState *target_bs; | |
3251 | AioContext *aio_context; | |
3252 | AioContext *old_context; | |
3253 | BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; | |
3254 | bool zero_target; | |
3255 | int ret; | |
3256 | ||
3257 | bs = qmp_get_root_bs(device, errp); | |
3258 | if (!bs) { | |
3259 | return; | |
3260 | } | |
3261 | ||
3262 | target_bs = bdrv_lookup_bs(target, target, errp); | |
3263 | if (!target_bs) { | |
3264 | return; | |
3265 | } | |
3266 | ||
3267 | zero_target = (sync == MIRROR_SYNC_MODE_FULL); | |
3268 | ||
3269 | /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ | |
3270 | old_context = bdrv_get_aio_context(target_bs); | |
3271 | aio_context = bdrv_get_aio_context(bs); | |
3272 | aio_context_acquire(old_context); | |
3273 | ||
3274 | ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); | |
3275 | ||
3276 | aio_context_release(old_context); | |
3277 | aio_context_acquire(aio_context); | |
3278 | ||
3279 | if (ret < 0) { | |
3280 | goto out; | |
3281 | } | |
3282 | ||
3283 | blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, | |
3284 | has_replaces, replaces, sync, backing_mode, | |
3285 | zero_target, has_speed, speed, | |
3286 | has_granularity, granularity, | |
3287 | has_buf_size, buf_size, | |
3288 | has_on_source_error, on_source_error, | |
3289 | has_on_target_error, on_target_error, | |
3290 | true, true, | |
3291 | has_filter_node_name, filter_node_name, | |
3292 | has_copy_mode, copy_mode, | |
3293 | has_auto_finalize, auto_finalize, | |
3294 | has_auto_dismiss, auto_dismiss, | |
3295 | errp); | |
3296 | out: | |
3297 | aio_context_release(aio_context); | |
3298 | } | |
3299 | ||
3300 | /* | |
3301 | * Get a block job using its ID. Called with job_mutex held. | |
3302 | */ | |
3303 | static BlockJob *find_block_job_locked(const char *id, Error **errp) | |
3304 | { | |
3305 | BlockJob *job; | |
3306 | ||
3307 | assert(id != NULL); | |
3308 | ||
3309 | job = block_job_get_locked(id); | |
3310 | ||
3311 | if (!job) { | |
3312 | error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, | |
3313 | "Block job '%s' not found", id); | |
3314 | return NULL; | |
3315 | } | |
3316 | ||
3317 | return job; | |
3318 | } | |
3319 | ||
3320 | void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) | |
3321 | { | |
3322 | BlockJob *job; | |
3323 | ||
3324 | JOB_LOCK_GUARD(); | |
3325 | job = find_block_job_locked(device, errp); | |
3326 | ||
3327 | if (!job) { | |
3328 | return; | |
3329 | } | |
3330 | ||
3331 | block_job_set_speed_locked(job, speed, errp); | |
3332 | } | |
3333 | ||
3334 | void qmp_block_job_cancel(const char *device, | |
3335 | bool has_force, bool force, Error **errp) | |
3336 | { | |
3337 | BlockJob *job; | |
3338 | ||
3339 | JOB_LOCK_GUARD(); | |
3340 | job = find_block_job_locked(device, errp); | |
3341 | ||
3342 | if (!job) { | |
3343 | return; | |
3344 | } | |
3345 | ||
3346 | if (!has_force) { | |
3347 | force = false; | |
3348 | } | |
3349 | ||
3350 | if (job_user_paused_locked(&job->job) && !force) { | |
3351 | error_setg(errp, "The block job for device '%s' is currently paused", | |
3352 | device); | |
3353 | return; | |
3354 | } | |
3355 | ||
3356 | trace_qmp_block_job_cancel(job); | |
3357 | job_user_cancel_locked(&job->job, force, errp); | |
3358 | } | |
3359 | ||
3360 | void qmp_block_job_pause(const char *device, Error **errp) | |
3361 | { | |
3362 | BlockJob *job; | |
3363 | ||
3364 | JOB_LOCK_GUARD(); | |
3365 | job = find_block_job_locked(device, errp); | |
3366 | ||
3367 | if (!job) { | |
3368 | return; | |
3369 | } | |
3370 | ||
3371 | trace_qmp_block_job_pause(job); | |
3372 | job_user_pause_locked(&job->job, errp); | |
3373 | } | |
3374 | ||
3375 | void qmp_block_job_resume(const char *device, Error **errp) | |
3376 | { | |
3377 | BlockJob *job; | |
3378 | ||
3379 | JOB_LOCK_GUARD(); | |
3380 | job = find_block_job_locked(device, errp); | |
3381 | ||
3382 | if (!job) { | |
3383 | return; | |
3384 | } | |
3385 | ||
3386 | trace_qmp_block_job_resume(job); | |
3387 | job_user_resume_locked(&job->job, errp); | |
3388 | } | |
3389 | ||
3390 | void qmp_block_job_complete(const char *device, Error **errp) | |
3391 | { | |
3392 | BlockJob *job; | |
3393 | ||
3394 | JOB_LOCK_GUARD(); | |
3395 | job = find_block_job_locked(device, errp); | |
3396 | ||
3397 | if (!job) { | |
3398 | return; | |
3399 | } | |
3400 | ||
3401 | trace_qmp_block_job_complete(job); | |
3402 | job_complete_locked(&job->job, errp); | |
3403 | } | |
3404 | ||
3405 | void qmp_block_job_finalize(const char *id, Error **errp) | |
3406 | { | |
3407 | BlockJob *job; | |
3408 | ||
3409 | JOB_LOCK_GUARD(); | |
3410 | job = find_block_job_locked(id, errp); | |
3411 | ||
3412 | if (!job) { | |
3413 | return; | |
3414 | } | |
3415 | ||
3416 | trace_qmp_block_job_finalize(job); | |
3417 | job_ref_locked(&job->job); | |
3418 | job_finalize_locked(&job->job, errp); | |
3419 | ||
3420 | job_unref_locked(&job->job); | |
3421 | } | |
3422 | ||
3423 | void qmp_block_job_dismiss(const char *id, Error **errp) | |
3424 | { | |
3425 | BlockJob *bjob; | |
3426 | Job *job; | |
3427 | ||
3428 | JOB_LOCK_GUARD(); | |
3429 | bjob = find_block_job_locked(id, errp); | |
3430 | ||
3431 | if (!bjob) { | |
3432 | return; | |
3433 | } | |
3434 | ||
3435 | trace_qmp_block_job_dismiss(bjob); | |
3436 | job = &bjob->job; | |
3437 | job_dismiss_locked(&job, errp); | |
3438 | } | |
3439 | ||
3440 | void qmp_change_backing_file(const char *device, | |
3441 | const char *image_node_name, | |
3442 | const char *backing_file, | |
3443 | Error **errp) | |
3444 | { | |
3445 | BlockDriverState *bs = NULL; | |
3446 | AioContext *aio_context; | |
3447 | BlockDriverState *image_bs = NULL; | |
3448 | Error *local_err = NULL; | |
3449 | bool ro; | |
3450 | int ret; | |
3451 | ||
3452 | bs = qmp_get_root_bs(device, errp); | |
3453 | if (!bs) { | |
3454 | return; | |
3455 | } | |
3456 | ||
3457 | aio_context = bdrv_get_aio_context(bs); | |
3458 | aio_context_acquire(aio_context); | |
3459 | ||
3460 | image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); | |
3461 | if (local_err) { | |
3462 | error_propagate(errp, local_err); | |
3463 | goto out; | |
3464 | } | |
3465 | ||
3466 | if (!image_bs) { | |
3467 | error_setg(errp, "image file not found"); | |
3468 | goto out; | |
3469 | } | |
3470 | ||
3471 | if (bdrv_find_base(image_bs) == image_bs) { | |
3472 | error_setg(errp, "not allowing backing file change on an image " | |
3473 | "without a backing file"); | |
3474 | goto out; | |
3475 | } | |
3476 | ||
3477 | /* even though we are not necessarily operating on bs, we need it to | |
3478 | * determine if block ops are currently prohibited on the chain */ | |
3479 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { | |
3480 | goto out; | |
3481 | } | |
3482 | ||
3483 | /* final sanity check */ | |
3484 | if (!bdrv_chain_contains(bs, image_bs)) { | |
3485 | error_setg(errp, "'%s' and image file are not in the same chain", | |
3486 | device); | |
3487 | goto out; | |
3488 | } | |
3489 | ||
3490 | /* if not r/w, reopen to make r/w */ | |
3491 | ro = bdrv_is_read_only(image_bs); | |
3492 | ||
3493 | if (ro) { | |
3494 | if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { | |
3495 | goto out; | |
3496 | } | |
3497 | } | |
3498 | ||
3499 | ret = bdrv_change_backing_file(image_bs, backing_file, | |
3500 | image_bs->drv ? image_bs->drv->format_name : "", | |
3501 | false); | |
3502 | ||
3503 | if (ret < 0) { | |
3504 | error_setg_errno(errp, -ret, "Could not change backing file to '%s'", | |
3505 | backing_file); | |
3506 | /* don't exit here, so we can try to restore open flags if | |
3507 | * appropriate */ | |
3508 | } | |
3509 | ||
3510 | if (ro) { | |
3511 | bdrv_reopen_set_read_only(image_bs, true, errp); | |
3512 | } | |
3513 | ||
3514 | out: | |
3515 | aio_context_release(aio_context); | |
3516 | } | |
3517 | ||
3518 | void qmp_blockdev_add(BlockdevOptions *options, Error **errp) | |
3519 | { | |
3520 | BlockDriverState *bs; | |
3521 | QObject *obj; | |
3522 | Visitor *v = qobject_output_visitor_new(&obj); | |
3523 | QDict *qdict; | |
3524 | ||
3525 | visit_type_BlockdevOptions(v, NULL, &options, &error_abort); | |
3526 | visit_complete(v, &obj); | |
3527 | qdict = qobject_to(QDict, obj); | |
3528 | ||
3529 | qdict_flatten(qdict); | |
3530 | ||
3531 | if (!qdict_get_try_str(qdict, "node-name")) { | |
3532 | error_setg(errp, "'node-name' must be specified for the root node"); | |
3533 | goto fail; | |
3534 | } | |
3535 | ||
3536 | bs = bds_tree_init(qdict, errp); | |
3537 | if (!bs) { | |
3538 | goto fail; | |
3539 | } | |
3540 | ||
3541 | bdrv_set_monitor_owned(bs); | |
3542 | ||
3543 | fail: | |
3544 | visit_free(v); | |
3545 | } | |
3546 | ||
3547 | void qmp_blockdev_reopen(BlockdevOptionsList *reopen_list, Error **errp) | |
3548 | { | |
3549 | BlockReopenQueue *queue = NULL; | |
3550 | GSList *drained = NULL; | |
3551 | GSList *p; | |
3552 | ||
3553 | /* Add each one of the BDS that we want to reopen to the queue */ | |
3554 | for (; reopen_list != NULL; reopen_list = reopen_list->next) { | |
3555 | BlockdevOptions *options = reopen_list->value; | |
3556 | BlockDriverState *bs; | |
3557 | AioContext *ctx; | |
3558 | QObject *obj; | |
3559 | Visitor *v; | |
3560 | QDict *qdict; | |
3561 | ||
3562 | /* Check for the selected node name */ | |
3563 | if (!options->has_node_name) { | |
3564 | error_setg(errp, "node-name not specified"); | |
3565 | goto fail; | |
3566 | } | |
3567 | ||
3568 | bs = bdrv_find_node(options->node_name); | |
3569 | if (!bs) { | |
3570 | error_setg(errp, "Failed to find node with node-name='%s'", | |
3571 | options->node_name); | |
3572 | goto fail; | |
3573 | } | |
3574 | ||
3575 | /* Put all options in a QDict and flatten it */ | |
3576 | v = qobject_output_visitor_new(&obj); | |
3577 | visit_type_BlockdevOptions(v, NULL, &options, &error_abort); | |
3578 | visit_complete(v, &obj); | |
3579 | visit_free(v); | |
3580 | ||
3581 | qdict = qobject_to(QDict, obj); | |
3582 | ||
3583 | qdict_flatten(qdict); | |
3584 | ||
3585 | ctx = bdrv_get_aio_context(bs); | |
3586 | aio_context_acquire(ctx); | |
3587 | ||
3588 | bdrv_subtree_drained_begin(bs); | |
3589 | queue = bdrv_reopen_queue(queue, bs, qdict, false); | |
3590 | drained = g_slist_prepend(drained, bs); | |
3591 | ||
3592 | aio_context_release(ctx); | |
3593 | } | |
3594 | ||
3595 | /* Perform the reopen operation */ | |
3596 | bdrv_reopen_multiple(queue, errp); | |
3597 | queue = NULL; | |
3598 | ||
3599 | fail: | |
3600 | bdrv_reopen_queue_free(queue); | |
3601 | for (p = drained; p; p = p->next) { | |
3602 | BlockDriverState *bs = p->data; | |
3603 | AioContext *ctx = bdrv_get_aio_context(bs); | |
3604 | ||
3605 | aio_context_acquire(ctx); | |
3606 | bdrv_subtree_drained_end(bs); | |
3607 | aio_context_release(ctx); | |
3608 | } | |
3609 | g_slist_free(drained); | |
3610 | } | |
3611 | ||
3612 | void qmp_blockdev_del(const char *node_name, Error **errp) | |
3613 | { | |
3614 | AioContext *aio_context; | |
3615 | BlockDriverState *bs; | |
3616 | ||
3617 | GLOBAL_STATE_CODE(); | |
3618 | ||
3619 | bs = bdrv_find_node(node_name); | |
3620 | if (!bs) { | |
3621 | error_setg(errp, "Failed to find node with node-name='%s'", node_name); | |
3622 | return; | |
3623 | } | |
3624 | if (bdrv_has_blk(bs)) { | |
3625 | error_setg(errp, "Node %s is in use", node_name); | |
3626 | return; | |
3627 | } | |
3628 | aio_context = bdrv_get_aio_context(bs); | |
3629 | aio_context_acquire(aio_context); | |
3630 | ||
3631 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { | |
3632 | goto out; | |
3633 | } | |
3634 | ||
3635 | if (!QTAILQ_IN_USE(bs, monitor_list)) { | |
3636 | error_setg(errp, "Node %s is not owned by the monitor", | |
3637 | bs->node_name); | |
3638 | goto out; | |
3639 | } | |
3640 | ||
3641 | if (bs->refcnt > 1) { | |
3642 | error_setg(errp, "Block device %s is in use", | |
3643 | bdrv_get_device_or_node_name(bs)); | |
3644 | goto out; | |
3645 | } | |
3646 | ||
3647 | QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); | |
3648 | bdrv_unref(bs); | |
3649 | ||
3650 | out: | |
3651 | aio_context_release(aio_context); | |
3652 | } | |
3653 | ||
3654 | static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, | |
3655 | const char *child_name) | |
3656 | { | |
3657 | BdrvChild *child; | |
3658 | ||
3659 | QLIST_FOREACH(child, &parent_bs->children, next) { | |
3660 | if (strcmp(child->name, child_name) == 0) { | |
3661 | return child; | |
3662 | } | |
3663 | } | |
3664 | ||
3665 | return NULL; | |
3666 | } | |
3667 | ||
3668 | void qmp_x_blockdev_change(const char *parent, bool has_child, | |
3669 | const char *child, bool has_node, | |
3670 | const char *node, Error **errp) | |
3671 | { | |
3672 | BlockDriverState *parent_bs, *new_bs = NULL; | |
3673 | BdrvChild *p_child; | |
3674 | ||
3675 | parent_bs = bdrv_lookup_bs(parent, parent, errp); | |
3676 | if (!parent_bs) { | |
3677 | return; | |
3678 | } | |
3679 | ||
3680 | if (has_child == has_node) { | |
3681 | if (has_child) { | |
3682 | error_setg(errp, "The parameters child and node are in conflict"); | |
3683 | } else { | |
3684 | error_setg(errp, "Either child or node must be specified"); | |
3685 | } | |
3686 | return; | |
3687 | } | |
3688 | ||
3689 | if (has_child) { | |
3690 | p_child = bdrv_find_child(parent_bs, child); | |
3691 | if (!p_child) { | |
3692 | error_setg(errp, "Node '%s' does not have child '%s'", | |
3693 | parent, child); | |
3694 | return; | |
3695 | } | |
3696 | bdrv_del_child(parent_bs, p_child, errp); | |
3697 | } | |
3698 | ||
3699 | if (has_node) { | |
3700 | new_bs = bdrv_find_node(node); | |
3701 | if (!new_bs) { | |
3702 | error_setg(errp, "Node '%s' not found", node); | |
3703 | return; | |
3704 | } | |
3705 | bdrv_add_child(parent_bs, new_bs, errp); | |
3706 | } | |
3707 | } | |
3708 | ||
3709 | BlockJobInfoList *qmp_query_block_jobs(Error **errp) | |
3710 | { | |
3711 | BlockJobInfoList *head = NULL, **tail = &head; | |
3712 | BlockJob *job; | |
3713 | ||
3714 | JOB_LOCK_GUARD(); | |
3715 | ||
3716 | for (job = block_job_next_locked(NULL); job; | |
3717 | job = block_job_next_locked(job)) { | |
3718 | BlockJobInfo *value; | |
3719 | ||
3720 | if (block_job_is_internal(job)) { | |
3721 | continue; | |
3722 | } | |
3723 | value = block_job_query_locked(job, errp); | |
3724 | if (!value) { | |
3725 | qapi_free_BlockJobInfoList(head); | |
3726 | return NULL; | |
3727 | } | |
3728 | QAPI_LIST_APPEND(tail, value); | |
3729 | } | |
3730 | ||
3731 | return head; | |
3732 | } | |
3733 | ||
3734 | void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, | |
3735 | bool has_force, bool force, Error **errp) | |
3736 | { | |
3737 | AioContext *old_context; | |
3738 | AioContext *new_context; | |
3739 | BlockDriverState *bs; | |
3740 | ||
3741 | bs = bdrv_find_node(node_name); | |
3742 | if (!bs) { | |
3743 | error_setg(errp, "Failed to find node with node-name='%s'", node_name); | |
3744 | return; | |
3745 | } | |
3746 | ||
3747 | /* Protects against accidents. */ | |
3748 | if (!(has_force && force) && bdrv_has_blk(bs)) { | |
3749 | error_setg(errp, "Node %s is associated with a BlockBackend and could " | |
3750 | "be in use (use force=true to override this check)", | |
3751 | node_name); | |
3752 | return; | |
3753 | } | |
3754 | ||
3755 | if (iothread->type == QTYPE_QSTRING) { | |
3756 | IOThread *obj = iothread_by_id(iothread->u.s); | |
3757 | if (!obj) { | |
3758 | error_setg(errp, "Cannot find iothread %s", iothread->u.s); | |
3759 | return; | |
3760 | } | |
3761 | ||
3762 | new_context = iothread_get_aio_context(obj); | |
3763 | } else { | |
3764 | new_context = qemu_get_aio_context(); | |
3765 | } | |
3766 | ||
3767 | old_context = bdrv_get_aio_context(bs); | |
3768 | aio_context_acquire(old_context); | |
3769 | ||
3770 | bdrv_try_change_aio_context(bs, new_context, NULL, errp); | |
3771 | ||
3772 | aio_context_release(old_context); | |
3773 | } | |
3774 | ||
3775 | QemuOptsList qemu_common_drive_opts = { | |
3776 | .name = "drive", | |
3777 | .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), | |
3778 | .desc = { | |
3779 | { | |
3780 | .name = "snapshot", | |
3781 | .type = QEMU_OPT_BOOL, | |
3782 | .help = "enable/disable snapshot mode", | |
3783 | },{ | |
3784 | .name = "aio", | |
3785 | .type = QEMU_OPT_STRING, | |
3786 | .help = "host AIO implementation (threads, native, io_uring)", | |
3787 | },{ | |
3788 | .name = BDRV_OPT_CACHE_WB, | |
3789 | .type = QEMU_OPT_BOOL, | |
3790 | .help = "Enable writeback mode", | |
3791 | },{ | |
3792 | .name = "format", | |
3793 | .type = QEMU_OPT_STRING, | |
3794 | .help = "disk format (raw, qcow2, ...)", | |
3795 | },{ | |
3796 | .name = "rerror", | |
3797 | .type = QEMU_OPT_STRING, | |
3798 | .help = "read error action", | |
3799 | },{ | |
3800 | .name = "werror", | |
3801 | .type = QEMU_OPT_STRING, | |
3802 | .help = "write error action", | |
3803 | },{ | |
3804 | .name = BDRV_OPT_READ_ONLY, | |
3805 | .type = QEMU_OPT_BOOL, | |
3806 | .help = "open drive file as read-only", | |
3807 | }, | |
3808 | ||
3809 | THROTTLE_OPTS, | |
3810 | ||
3811 | { | |
3812 | .name = "throttling.group", | |
3813 | .type = QEMU_OPT_STRING, | |
3814 | .help = "name of the block throttling group", | |
3815 | },{ | |
3816 | .name = "copy-on-read", | |
3817 | .type = QEMU_OPT_BOOL, | |
3818 | .help = "copy read data from backing file into image file", | |
3819 | },{ | |
3820 | .name = "detect-zeroes", | |
3821 | .type = QEMU_OPT_STRING, | |
3822 | .help = "try to optimize zero writes (off, on, unmap)", | |
3823 | },{ | |
3824 | .name = "stats-account-invalid", | |
3825 | .type = QEMU_OPT_BOOL, | |
3826 | .help = "whether to account for invalid I/O operations " | |
3827 | "in the statistics", | |
3828 | },{ | |
3829 | .name = "stats-account-failed", | |
3830 | .type = QEMU_OPT_BOOL, | |
3831 | .help = "whether to account for failed I/O operations " | |
3832 | "in the statistics", | |
3833 | }, | |
3834 | { /* end of list */ } | |
3835 | }, | |
3836 | }; | |
3837 | ||
3838 | QemuOptsList qemu_drive_opts = { | |
3839 | .name = "drive", | |
3840 | .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), | |
3841 | .desc = { | |
3842 | /* | |
3843 | * no elements => accept any params | |
3844 | * validation will happen later | |
3845 | */ | |
3846 | { /* end of list */ } | |
3847 | }, | |
3848 | }; |