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