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Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging
[qemu/armbru.git] / blockdev.c
blob057601dcf03800306e57744d80e2e103806dec07
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/dirty-bitmap.h"
39 #include "block/qdict.h"
40 #include "block/throttle-groups.h"
41 #include "monitor/monitor.h"
42 #include "qemu/error-report.h"
43 #include "qemu/option.h"
44 #include "qemu/qemu-print.h"
45 #include "qemu/config-file.h"
46 #include "qapi/qapi-commands-block.h"
47 #include "qapi/qapi-commands-transaction.h"
48 #include "qapi/qapi-visit-block-core.h"
49 #include "qapi/qmp/qdict.h"
50 #include "qapi/qmp/qnum.h"
51 #include "qapi/qmp/qstring.h"
52 #include "qapi/error.h"
53 #include "qapi/qmp/qerror.h"
54 #include "qapi/qmp/qlist.h"
55 #include "qapi/qobject-output-visitor.h"
56 #include "sysemu/sysemu.h"
57 #include "sysemu/iothread.h"
58 #include "block/block_int.h"
59 #include "block/trace.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 /* Protected by BQL */
68 QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
69 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
70
71 void bdrv_set_monitor_owned(BlockDriverState *bs)
72 {
73 GLOBAL_STATE_CODE();
74 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
75 }
76
77 static const char *const if_name[IF_COUNT] = {
78 [IF_NONE] = "none",
79 [IF_IDE] = "ide",
80 [IF_SCSI] = "scsi",
81 [IF_FLOPPY] = "floppy",
82 [IF_PFLASH] = "pflash",
83 [IF_MTD] = "mtd",
84 [IF_SD] = "sd",
85 [IF_VIRTIO] = "virtio",
86 [IF_XEN] = "xen",
87 };
88
89 static int if_max_devs[IF_COUNT] = {
90 /*
91 * Do not change these numbers! They govern how drive option
92 * index maps to unit and bus. That mapping is ABI.
93 *
94 * All controllers used to implement if=T drives need to support
95 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
96 * Otherwise, some index values map to "impossible" bus, unit
97 * values.
98 *
99 * For instance, if you change [IF_SCSI] to 255, -drive
100 * if=scsi,index=12 no longer means bus=1,unit=5, but
101 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
102 * the drive can't be set up. Regression.
103 */
104 [IF_IDE] = 2,
105 [IF_SCSI] = 7,
106 };
107
108 /**
109 * Boards may call this to offer board-by-board overrides
110 * of the default, global values.
111 */
112 void override_max_devs(BlockInterfaceType type, int max_devs)
113 {
114 BlockBackend *blk;
115 DriveInfo *dinfo;
116
117 GLOBAL_STATE_CODE();
118
119 if (max_devs <= 0) {
120 return;
121 }
122
123 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
124 dinfo = blk_legacy_dinfo(blk);
125 if (dinfo->type == type) {
126 fprintf(stderr, "Cannot override units-per-bus property of"
127 " the %s interface, because a drive of that type has"
128 " already been added.\n", if_name[type]);
129 g_assert_not_reached();
130 }
131 }
132
133 if_max_devs[type] = max_devs;
134 }
135
136 /*
137 * We automatically delete the drive when a device using it gets
138 * unplugged. Questionable feature, but we can't just drop it.
139 * Device models call blockdev_mark_auto_del() to schedule the
140 * automatic deletion, and generic qdev code calls blockdev_auto_del()
141 * when deletion is actually safe.
142 */
143 void blockdev_mark_auto_del(BlockBackend *blk)
144 {
145 DriveInfo *dinfo = blk_legacy_dinfo(blk);
146 BlockJob *job;
147
148 GLOBAL_STATE_CODE();
149
150 if (!dinfo) {
151 return;
152 }
153
154 JOB_LOCK_GUARD();
155
156 do {
157 job = block_job_next_locked(NULL);
158 while (job && (job->job.cancelled ||
159 job->job.deferred_to_main_loop ||
160 !block_job_has_bdrv(job, blk_bs(blk))))
161 {
162 job = block_job_next_locked(job);
163 }
164 if (job) {
165 /*
166 * This drops the job lock temporarily and polls, so we need to
167 * restart processing the list from the start after this.
168 */
169 job_cancel_locked(&job->job, false);
170 }
171 } while (job);
172
173 dinfo->auto_del = 1;
174 }
175
176 void blockdev_auto_del(BlockBackend *blk)
177 {
178 DriveInfo *dinfo = blk_legacy_dinfo(blk);
179 GLOBAL_STATE_CODE();
180
181 if (dinfo && dinfo->auto_del) {
182 monitor_remove_blk(blk);
183 blk_unref(blk);
184 }
185 }
186
187 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
188 {
189 int max_devs = if_max_devs[type];
190 return max_devs ? index / max_devs : 0;
191 }
192
193 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
194 {
195 int max_devs = if_max_devs[type];
196 return max_devs ? index % max_devs : index;
197 }
198
199 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
200 const char *optstr)
201 {
202 QemuOpts *opts;
203
204 GLOBAL_STATE_CODE();
205
206 opts = qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
207 if (!opts) {
208 return NULL;
209 }
210 if (type != IF_DEFAULT) {
211 qemu_opt_set(opts, "if", if_name[type], &error_abort);
212 }
213 if (index >= 0) {
214 qemu_opt_set_number(opts, "index", index, &error_abort);
215 }
216 if (file)
217 qemu_opt_set(opts, "file", file, &error_abort);
218 return opts;
219 }
220
221 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
222 {
223 BlockBackend *blk;
224 DriveInfo *dinfo;
225
226 GLOBAL_STATE_CODE();
227
228 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
229 dinfo = blk_legacy_dinfo(blk);
230 if (dinfo && dinfo->type == type
231 && dinfo->bus == bus && dinfo->unit == unit) {
232 return dinfo;
233 }
234 }
235
236 return NULL;
237 }
238
239 /*
240 * Check board claimed all -drive that are meant to be claimed.
241 * Fatal error if any remain unclaimed.
242 */
243 void drive_check_orphaned(void)
244 {
245 BlockBackend *blk;
246 DriveInfo *dinfo;
247 Location loc;
248 bool orphans = false;
249
250 GLOBAL_STATE_CODE();
251
252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
253 dinfo = blk_legacy_dinfo(blk);
254 /*
255 * Ignore default drives, because we create certain default
256 * drives unconditionally, then leave them unclaimed. Not the
257 * users fault.
258 * Ignore IF_VIRTIO or IF_XEN, because it gets desugared into
259 * -device, so we can leave failing to -device.
260 * Ignore IF_NONE, because leaving unclaimed IF_NONE remains
261 * available for device_add is a feature.
262 */
263 if (dinfo->is_default || dinfo->type == IF_VIRTIO
264 || dinfo->type == IF_XEN || dinfo->type == IF_NONE) {
265 continue;
266 }
267 if (!blk_get_attached_dev(blk)) {
268 loc_push_none(&loc);
269 qemu_opts_loc_restore(dinfo->opts);
270 error_report("machine type does not support"
271 " if=%s,bus=%d,unit=%d",
272 if_name[dinfo->type], dinfo->bus, dinfo->unit);
273 loc_pop(&loc);
274 orphans = true;
275 }
276 }
277
278 if (orphans) {
279 exit(1);
280 }
281 }
282
283 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
284 {
285 GLOBAL_STATE_CODE();
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 GLOBAL_STATE_CODE();
298
299 max_bus = -1;
300 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
301 dinfo = blk_legacy_dinfo(blk);
302 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
303 max_bus = dinfo->bus;
304 }
305 }
306 return max_bus;
307 }
308
309 static void bdrv_format_print(void *opaque, const char *name)
310 {
311 qemu_printf(" %s", name);
312 }
313
314 typedef struct {
315 QEMUBH *bh;
316 BlockDriverState *bs;
317 } BDRVPutRefBH;
318
319 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
320 {
321 if (!strcmp(buf, "ignore")) {
322 return BLOCKDEV_ON_ERROR_IGNORE;
323 } else if (!is_read && !strcmp(buf, "enospc")) {
324 return BLOCKDEV_ON_ERROR_ENOSPC;
325 } else if (!strcmp(buf, "stop")) {
326 return BLOCKDEV_ON_ERROR_STOP;
327 } else if (!strcmp(buf, "report")) {
328 return BLOCKDEV_ON_ERROR_REPORT;
329 } else {
330 error_setg(errp, "'%s' invalid %s error action",
331 buf, is_read ? "read" : "write");
332 return -1;
333 }
334 }
335
336 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
337 Error **errp)
338 {
339 const QListEntry *entry;
340 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
341 switch (qobject_type(entry->value)) {
342
343 case QTYPE_QSTRING: {
344 uint64_t length;
345 const char *str = qstring_get_str(qobject_to(QString,
346 entry->value));
347 if (parse_uint_full(str, 10, &length) == 0 &&
348 length > 0 && length <= UINT_MAX) {
349 block_acct_add_interval(stats, (unsigned) length);
350 } else {
351 error_setg(errp, "Invalid interval length: %s", str);
352 return false;
353 }
354 break;
355 }
356
357 case QTYPE_QNUM: {
358 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
359
360 if (length > 0 && length <= UINT_MAX) {
361 block_acct_add_interval(stats, (unsigned) length);
362 } else {
363 error_setg(errp, "Invalid interval length: %" PRId64, length);
364 return false;
365 }
366 break;
367 }
368
369 default:
370 error_setg(errp, "The specification of stats-intervals is invalid");
371 return false;
372 }
373 }
374 return true;
375 }
376
377 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
378
379 /* All parameters but @opts are optional and may be set to NULL. */
380 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
381 const char **throttling_group, ThrottleConfig *throttle_cfg,
382 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
383 {
384 Error *local_error = NULL;
385 const char *aio;
386
387 if (bdrv_flags) {
388 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
389 *bdrv_flags |= BDRV_O_COPY_ON_READ;
390 }
391
392 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
393 if (bdrv_parse_aio(aio, bdrv_flags) < 0) {
394 error_setg(errp, "invalid aio option");
395 return;
396 }
397 }
398 }
399
400 /* disk I/O throttling */
401 if (throttling_group) {
402 *throttling_group = qemu_opt_get(opts, "throttling.group");
403 }
404
405 if (throttle_cfg) {
406 throttle_config_init(throttle_cfg);
407 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
408 qemu_opt_get_number(opts, "throttling.bps-total", 0);
409 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
410 qemu_opt_get_number(opts, "throttling.bps-read", 0);
411 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
412 qemu_opt_get_number(opts, "throttling.bps-write", 0);
413 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
414 qemu_opt_get_number(opts, "throttling.iops-total", 0);
415 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
416 qemu_opt_get_number(opts, "throttling.iops-read", 0);
417 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
418 qemu_opt_get_number(opts, "throttling.iops-write", 0);
419
420 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
421 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
422 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
423 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
424 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
425 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
426 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
427 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
428 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
429 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
430 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
431 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
432
433 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
434 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
435 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
436 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
437 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
438 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
439 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
440 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
441 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
442 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
443 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
444 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
445
446 throttle_cfg->op_size =
447 qemu_opt_get_number(opts, "throttling.iops-size", 0);
448
449 if (!throttle_is_valid(throttle_cfg, errp)) {
450 return;
451 }
452 }
453
454 if (detect_zeroes) {
455 *detect_zeroes =
456 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
457 qemu_opt_get(opts, "detect-zeroes"),
458 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
459 &local_error);
460 if (local_error) {
461 error_propagate(errp, local_error);
462 return;
463 }
464 }
465 }
466
467 static OnOffAuto account_get_opt(QemuOpts *opts, const char *name)
468 {
469 if (!qemu_opt_find(opts, name)) {
470 return ON_OFF_AUTO_AUTO;
471 }
472 if (qemu_opt_get_bool(opts, name, true)) {
473 return ON_OFF_AUTO_ON;
474 }
475 return ON_OFF_AUTO_OFF;
476 }
477
478 /* Takes the ownership of bs_opts */
479 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
480 Error **errp)
481 {
482 const char *buf;
483 int bdrv_flags = 0;
484 int on_read_error, on_write_error;
485 OnOffAuto account_invalid, account_failed;
486 bool writethrough, read_only;
487 BlockBackend *blk;
488 BlockDriverState *bs;
489 ThrottleConfig cfg;
490 int snapshot = 0;
491 Error *error = NULL;
492 QemuOpts *opts;
493 QDict *interval_dict = NULL;
494 QList *interval_list = NULL;
495 const char *id;
496 BlockdevDetectZeroesOptions detect_zeroes =
497 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
498 const char *throttling_group = NULL;
499
500 /* Check common options by copying from bs_opts to opts, all other options
501 * stay in bs_opts for processing by bdrv_open(). */
502 id = qdict_get_try_str(bs_opts, "id");
503 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, errp);
504 if (!opts) {
505 goto err_no_opts;
506 }
507
508 if (!qemu_opts_absorb_qdict(opts, bs_opts, errp)) {
509 goto early_err;
510 }
511
512 if (id) {
513 qdict_del(bs_opts, "id");
514 }
515
516 /* extract parameters */
517 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
518
519 account_invalid = account_get_opt(opts, "stats-account-invalid");
520 account_failed = account_get_opt(opts, "stats-account-failed");
521
522 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
523
524 id = qemu_opts_id(opts);
525
526 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
527 qdict_array_split(interval_dict, &interval_list);
528
529 if (qdict_size(interval_dict) != 0) {
530 error_setg(errp, "Invalid option stats-intervals.%s",
531 qdict_first(interval_dict)->key);
532 goto early_err;
533 }
534
535 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
536 &detect_zeroes, &error);
537 if (error) {
538 error_propagate(errp, error);
539 goto early_err;
540 }
541
542 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
543 if (is_help_option(buf)) {
544 qemu_printf("Supported formats:");
545 bdrv_iterate_format(bdrv_format_print, NULL, false);
546 qemu_printf("\nSupported formats (read-only):");
547 bdrv_iterate_format(bdrv_format_print, NULL, true);
548 qemu_printf("\n");
549 goto early_err;
550 }
551
552 if (qdict_haskey(bs_opts, "driver")) {
553 error_setg(errp, "Cannot specify both 'driver' and 'format'");
554 goto early_err;
555 }
556 qdict_put_str(bs_opts, "driver", buf);
557 }
558
559 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
560 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
561 on_write_error = parse_block_error_action(buf, 0, &error);
562 if (error) {
563 error_propagate(errp, error);
564 goto early_err;
565 }
566 }
567
568 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
569 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
570 on_read_error = parse_block_error_action(buf, 1, &error);
571 if (error) {
572 error_propagate(errp, error);
573 goto early_err;
574 }
575 }
576
577 if (snapshot) {
578 bdrv_flags |= BDRV_O_SNAPSHOT;
579 }
580
581 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
582
583 /* init */
584 if ((!file || !*file) && !qdict_size(bs_opts)) {
585 BlockBackendRootState *blk_rs;
586
587 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
588 blk_rs = blk_get_root_state(blk);
589 blk_rs->open_flags = bdrv_flags | (read_only ? 0 : BDRV_O_RDWR);
590 blk_rs->detect_zeroes = detect_zeroes;
591
592 qobject_unref(bs_opts);
593 } else {
594 if (file && !*file) {
595 file = NULL;
596 }
597
598 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
599 * with other callers) rather than what we want as the real defaults.
600 * Apply the defaults here instead. */
601 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
602 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
603 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
604 read_only ? "on" : "off");
605 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on");
606 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
607
608 if (runstate_check(RUN_STATE_INMIGRATE)) {
609 bdrv_flags |= BDRV_O_INACTIVE;
610 }
611
612 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
613 if (!blk) {
614 goto err_no_bs_opts;
615 }
616 bs = blk_bs(blk);
617
618 bs->detect_zeroes = detect_zeroes;
619
620 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
621
622 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
623 blk_unref(blk);
624 blk = NULL;
625 goto err_no_bs_opts;
626 }
627 }
628
629 /* disk I/O throttling */
630 if (throttle_enabled(&cfg)) {
631 if (!throttling_group) {
632 throttling_group = id;
633 }
634 blk_io_limits_enable(blk, throttling_group);
635 blk_set_io_limits(blk, &cfg);
636 }
637
638 blk_set_enable_write_cache(blk, !writethrough);
639 blk_set_on_error(blk, on_read_error, on_write_error);
640
641 if (!monitor_add_blk(blk, id, errp)) {
642 blk_unref(blk);
643 blk = NULL;
644 goto err_no_bs_opts;
645 }
646
647 err_no_bs_opts:
648 qemu_opts_del(opts);
649 qobject_unref(interval_dict);
650 qobject_unref(interval_list);
651 return blk;
652
653 early_err:
654 qemu_opts_del(opts);
655 qobject_unref(interval_dict);
656 qobject_unref(interval_list);
657 err_no_opts:
658 qobject_unref(bs_opts);
659 return NULL;
660 }
661
662 /* Takes the ownership of bs_opts */
663 BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
664 {
665 int bdrv_flags = 0;
666
667 GLOBAL_STATE_CODE();
668 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
669 * with other callers) rather than what we want as the real defaults.
670 * Apply the defaults here instead. */
671 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
672 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
673 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
674
675 if (runstate_check(RUN_STATE_INMIGRATE)) {
676 bdrv_flags |= BDRV_O_INACTIVE;
677 }
678
679 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
680 }
681
682 void blockdev_close_all_bdrv_states(void)
683 {
684 BlockDriverState *bs, *next_bs;
685
686 GLOBAL_STATE_CODE();
687 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
688 bdrv_unref(bs);
689 }
690 }
691
692 /* Iterates over the list of monitor-owned BlockDriverStates */
693 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
694 {
695 GLOBAL_STATE_CODE();
696 return bs ? QTAILQ_NEXT(bs, monitor_list)
697 : QTAILQ_FIRST(&monitor_bdrv_states);
698 }
699
700 static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
701 Error **errp)
702 {
703 const char *value;
704
705 value = qemu_opt_get(opts, from);
706 if (value) {
707 if (qemu_opt_find(opts, to)) {
708 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
709 "same time", to, from);
710 return false;
711 }
712 }
713
714 /* rename all items in opts */
715 while ((value = qemu_opt_get(opts, from))) {
716 qemu_opt_set(opts, to, value, &error_abort);
717 qemu_opt_unset(opts, from);
718 }
719 return true;
720 }
721
722 QemuOptsList qemu_legacy_drive_opts = {
723 .name = "drive",
724 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
725 .desc = {
726 {
727 .name = "bus",
728 .type = QEMU_OPT_NUMBER,
729 .help = "bus number",
730 },{
731 .name = "unit",
732 .type = QEMU_OPT_NUMBER,
733 .help = "unit number (i.e. lun for scsi)",
734 },{
735 .name = "index",
736 .type = QEMU_OPT_NUMBER,
737 .help = "index number",
738 },{
739 .name = "media",
740 .type = QEMU_OPT_STRING,
741 .help = "media type (disk, cdrom)",
742 },{
743 .name = "if",
744 .type = QEMU_OPT_STRING,
745 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
746 },{
747 .name = "file",
748 .type = QEMU_OPT_STRING,
749 .help = "file name",
750 },
751
752 /* Options that are passed on, but have special semantics with -drive */
753 {
754 .name = BDRV_OPT_READ_ONLY,
755 .type = QEMU_OPT_BOOL,
756 .help = "open drive file as read-only",
757 },{
758 .name = "rerror",
759 .type = QEMU_OPT_STRING,
760 .help = "read error action",
761 },{
762 .name = "werror",
763 .type = QEMU_OPT_STRING,
764 .help = "write error action",
765 },{
766 .name = "copy-on-read",
767 .type = QEMU_OPT_BOOL,
768 .help = "copy read data from backing file into image file",
769 },
770
771 { /* end of list */ }
772 },
773 };
774
775 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
776 Error **errp)
777 {
778 const char *value;
779 BlockBackend *blk;
780 DriveInfo *dinfo = NULL;
781 QDict *bs_opts;
782 QemuOpts *legacy_opts;
783 DriveMediaType media = MEDIA_DISK;
784 BlockInterfaceType type;
785 int max_devs, bus_id, unit_id, index;
786 const char *werror, *rerror;
787 bool read_only = false;
788 bool copy_on_read;
789 const char *filename;
790 int i;
791
792 GLOBAL_STATE_CODE();
793
794 /* Change legacy command line options into QMP ones */
795 static const struct {
796 const char *from;
797 const char *to;
798 } opt_renames[] = {
799 { "iops", "throttling.iops-total" },
800 { "iops_rd", "throttling.iops-read" },
801 { "iops_wr", "throttling.iops-write" },
802
803 { "bps", "throttling.bps-total" },
804 { "bps_rd", "throttling.bps-read" },
805 { "bps_wr", "throttling.bps-write" },
806
807 { "iops_max", "throttling.iops-total-max" },
808 { "iops_rd_max", "throttling.iops-read-max" },
809 { "iops_wr_max", "throttling.iops-write-max" },
810
811 { "bps_max", "throttling.bps-total-max" },
812 { "bps_rd_max", "throttling.bps-read-max" },
813 { "bps_wr_max", "throttling.bps-write-max" },
814
815 { "iops_size", "throttling.iops-size" },
816
817 { "group", "throttling.group" },
818
819 { "readonly", BDRV_OPT_READ_ONLY },
820 };
821
822 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
823 if (!qemu_opt_rename(all_opts, opt_renames[i].from,
824 opt_renames[i].to, errp)) {
825 return NULL;
826 }
827 }
828
829 value = qemu_opt_get(all_opts, "cache");
830 if (value) {
831 int flags = 0;
832 bool writethrough;
833
834 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
835 error_setg(errp, "invalid cache option");
836 return NULL;
837 }
838
839 /* Specific options take precedence */
840 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
841 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
842 !writethrough, &error_abort);
843 }
844 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
845 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
846 !!(flags & BDRV_O_NOCACHE), &error_abort);
847 }
848 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
849 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
850 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
851 }
852 qemu_opt_unset(all_opts, "cache");
853 }
854
855 /* Get a QDict for processing the options */
856 bs_opts = qdict_new();
857 qemu_opts_to_qdict(all_opts, bs_opts);
858
859 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
860 &error_abort);
861 if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) {
862 goto fail;
863 }
864
865 /* Media type */
866 value = qemu_opt_get(legacy_opts, "media");
867 if (value) {
868 if (!strcmp(value, "disk")) {
869 media = MEDIA_DISK;
870 } else if (!strcmp(value, "cdrom")) {
871 media = MEDIA_CDROM;
872 read_only = true;
873 } else {
874 error_setg(errp, "'%s' invalid media", value);
875 goto fail;
876 }
877 }
878
879 /* copy-on-read is disabled with a warning for read-only devices */
880 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
881 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
882
883 if (read_only && copy_on_read) {
884 warn_report("disabling copy-on-read on read-only drive");
885 copy_on_read = false;
886 }
887
888 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
889 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
890
891 /* Controller type */
892 value = qemu_opt_get(legacy_opts, "if");
893 if (value) {
894 for (type = 0;
895 type < IF_COUNT && strcmp(value, if_name[type]);
896 type++) {
897 }
898 if (type == IF_COUNT) {
899 error_setg(errp, "unsupported bus type '%s'", value);
900 goto fail;
901 }
902 } else {
903 type = block_default_type;
904 }
905
906 /* Device address specified by bus/unit or index.
907 * If none was specified, try to find the first free one. */
908 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
909 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
910 index = qemu_opt_get_number(legacy_opts, "index", -1);
911
912 max_devs = if_max_devs[type];
913
914 if (index != -1) {
915 if (bus_id != 0 || unit_id != -1) {
916 error_setg(errp, "index cannot be used with bus and unit");
917 goto fail;
918 }
919 bus_id = drive_index_to_bus_id(type, index);
920 unit_id = drive_index_to_unit_id(type, index);
921 }
922
923 if (unit_id == -1) {
924 unit_id = 0;
925 while (drive_get(type, bus_id, unit_id) != NULL) {
926 unit_id++;
927 if (max_devs && unit_id >= max_devs) {
928 unit_id -= max_devs;
929 bus_id++;
930 }
931 }
932 }
933
934 if (max_devs && unit_id >= max_devs) {
935 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
936 goto fail;
937 }
938
939 if (drive_get(type, bus_id, unit_id) != NULL) {
940 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
941 bus_id, unit_id, index);
942 goto fail;
943 }
944
945 /* no id supplied -> create one */
946 if (qemu_opts_id(all_opts) == NULL) {
947 char *new_id;
948 const char *mediastr = "";
949 if (type == IF_IDE || type == IF_SCSI) {
950 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
951 }
952 if (max_devs) {
953 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
954 mediastr, unit_id);
955 } else {
956 new_id = g_strdup_printf("%s%s%i", if_name[type],
957 mediastr, unit_id);
958 }
959 qdict_put_str(bs_opts, "id", new_id);
960 g_free(new_id);
961 }
962
963 /* Add virtio block device */
964 if (type == IF_VIRTIO) {
965 QemuOpts *devopts;
966 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
967 &error_abort);
968 qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort);
969 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
970 &error_abort);
971 } else if (type == IF_XEN) {
972 QemuOpts *devopts;
973 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
974 &error_abort);
975 qemu_opt_set(devopts, "driver",
976 (media == MEDIA_CDROM) ? "xen-cdrom" : "xen-disk",
977 &error_abort);
978 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
979 &error_abort);
980 }
981
982 filename = qemu_opt_get(legacy_opts, "file");
983
984 /* Check werror/rerror compatibility with if=... */
985 werror = qemu_opt_get(legacy_opts, "werror");
986 if (werror != NULL) {
987 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
988 type != IF_NONE) {
989 error_setg(errp, "werror is not supported by this bus type");
990 goto fail;
991 }
992 qdict_put_str(bs_opts, "werror", werror);
993 }
994
995 rerror = qemu_opt_get(legacy_opts, "rerror");
996 if (rerror != NULL) {
997 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
998 type != IF_NONE) {
999 error_setg(errp, "rerror is not supported by this bus type");
1000 goto fail;
1001 }
1002 qdict_put_str(bs_opts, "rerror", rerror);
1003 }
1004
1005 /* Actual block device init: Functionality shared with blockdev-add */
1006 blk = blockdev_init(filename, bs_opts, errp);
1007 bs_opts = NULL;
1008 if (!blk) {
1009 goto fail;
1010 }
1011
1012 /* Create legacy DriveInfo */
1013 dinfo = g_malloc0(sizeof(*dinfo));
1014 dinfo->opts = all_opts;
1015
1016 dinfo->type = type;
1017 dinfo->bus = bus_id;
1018 dinfo->unit = unit_id;
1019
1020 blk_set_legacy_dinfo(blk, dinfo);
1021
1022 switch(type) {
1023 case IF_IDE:
1024 case IF_SCSI:
1025 case IF_XEN:
1026 case IF_NONE:
1027 dinfo->media_cd = media == MEDIA_CDROM;
1028 break;
1029 default:
1030 break;
1031 }
1032
1033 fail:
1034 qemu_opts_del(legacy_opts);
1035 qobject_unref(bs_opts);
1036 return dinfo;
1037 }
1038
1039 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1040 {
1041 BlockDriverState *bs;
1042
1043 GRAPH_RDLOCK_GUARD_MAINLOOP();
1044
1045 bs = bdrv_lookup_bs(name, name, errp);
1046 if (bs == NULL) {
1047 return NULL;
1048 }
1049
1050 if (!bdrv_is_root_node(bs)) {
1051 error_setg(errp, "Need a root block node");
1052 return NULL;
1053 }
1054
1055 if (!bdrv_is_inserted(bs)) {
1056 error_setg(errp, "Device has no medium");
1057 bs = NULL;
1058 }
1059
1060 return bs;
1061 }
1062
1063 static void blockdev_do_action(TransactionAction *action, Error **errp)
1064 {
1065 TransactionActionList list;
1066
1067 list.value = action;
1068 list.next = NULL;
1069 qmp_transaction(&list, NULL, errp);
1070 }
1071
1072 void qmp_blockdev_snapshot_sync(const char *device, const char *node_name,
1073 const char *snapshot_file,
1074 const char *snapshot_node_name,
1075 const char *format,
1076 bool has_mode, NewImageMode mode, Error **errp)
1077 {
1078 BlockdevSnapshotSync snapshot = {
1079 .device = (char *) device,
1080 .node_name = (char *) node_name,
1081 .snapshot_file = (char *) snapshot_file,
1082 .snapshot_node_name = (char *) snapshot_node_name,
1083 .format = (char *) format,
1084 .has_mode = has_mode,
1085 .mode = mode,
1086 };
1087 TransactionAction action = {
1088 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1089 .u.blockdev_snapshot_sync.data = &snapshot,
1090 };
1091 blockdev_do_action(&action, errp);
1092 }
1093
1094 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1095 Error **errp)
1096 {
1097 BlockdevSnapshot snapshot_data = {
1098 .node = (char *) node,
1099 .overlay = (char *) overlay
1100 };
1101 TransactionAction action = {
1102 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1103 .u.blockdev_snapshot.data = &snapshot_data,
1104 };
1105 blockdev_do_action(&action, errp);
1106 }
1107
1108 void qmp_blockdev_snapshot_internal_sync(const char *device,
1109 const char *name,
1110 Error **errp)
1111 {
1112 BlockdevSnapshotInternal snapshot = {
1113 .device = (char *) device,
1114 .name = (char *) name
1115 };
1116 TransactionAction action = {
1117 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1118 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1119 };
1120 blockdev_do_action(&action, errp);
1121 }
1122
1123 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1124 const char *id,
1125 const char *name,
1126 Error **errp)
1127 {
1128 BlockDriverState *bs;
1129 QEMUSnapshotInfo sn;
1130 Error *local_err = NULL;
1131 SnapshotInfo *info = NULL;
1132 int ret;
1133
1134 GLOBAL_STATE_CODE();
1135 GRAPH_RDLOCK_GUARD_MAINLOOP();
1136
1137 bs = qmp_get_root_bs(device, errp);
1138 if (!bs) {
1139 return NULL;
1140 }
1141
1142 if (!id && !name) {
1143 error_setg(errp, "Name or id must be provided");
1144 return NULL;
1145 }
1146
1147 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1148 return NULL;
1149 }
1150
1151 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1152 if (local_err) {
1153 error_propagate(errp, local_err);
1154 return NULL;
1155 }
1156 if (!ret) {
1157 error_setg(errp,
1158 "Snapshot with id '%s' and name '%s' does not exist on "
1159 "device '%s'",
1160 STR_OR_NULL(id), STR_OR_NULL(name), device);
1161 return NULL;
1162 }
1163
1164 bdrv_snapshot_delete(bs, id, name, &local_err);
1165 if (local_err) {
1166 error_propagate(errp, local_err);
1167 return NULL;
1168 }
1169
1170 info = g_new0(SnapshotInfo, 1);
1171 info->id = g_strdup(sn.id_str);
1172 info->name = g_strdup(sn.name);
1173 info->date_nsec = sn.date_nsec;
1174 info->date_sec = sn.date_sec;
1175 info->vm_state_size = sn.vm_state_size;
1176 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1177 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1178 if (sn.icount != -1ULL) {
1179 info->icount = sn.icount;
1180 info->has_icount = true;
1181 }
1182
1183 return info;
1184 }
1185
1186 /* internal snapshot private data */
1187 typedef struct InternalSnapshotState {
1188 BlockDriverState *bs;
1189 QEMUSnapshotInfo sn;
1190 bool created;
1191 } InternalSnapshotState;
1192
1193 static void internal_snapshot_abort(void *opaque);
1194 static void internal_snapshot_clean(void *opaque);
1195 TransactionActionDrv internal_snapshot_drv = {
1196 .abort = internal_snapshot_abort,
1197 .clean = internal_snapshot_clean,
1198 };
1199
1200 static void internal_snapshot_action(BlockdevSnapshotInternal *internal,
1201 Transaction *tran, Error **errp)
1202 {
1203 Error *local_err = NULL;
1204 const char *device;
1205 const char *name;
1206 BlockDriverState *bs;
1207 QEMUSnapshotInfo old_sn, *sn;
1208 bool ret;
1209 int64_t rt;
1210 InternalSnapshotState *state = g_new0(InternalSnapshotState, 1);
1211 int ret1;
1212
1213 GLOBAL_STATE_CODE();
1214 GRAPH_RDLOCK_GUARD_MAINLOOP();
1215
1216 tran_add(tran, &internal_snapshot_drv, state);
1217
1218 device = internal->device;
1219 name = internal->name;
1220
1221 bs = qmp_get_root_bs(device, errp);
1222 if (!bs) {
1223 return;
1224 }
1225
1226 state->bs = bs;
1227
1228 /* Paired with .clean() */
1229 bdrv_drained_begin(bs);
1230
1231 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1232 return;
1233 }
1234
1235 if (bdrv_is_read_only(bs)) {
1236 error_setg(errp, "Device '%s' is read only", device);
1237 return;
1238 }
1239
1240 if (!bdrv_can_snapshot(bs)) {
1241 error_setg(errp, "Block format '%s' used by device '%s' "
1242 "does not support internal snapshots",
1243 bs->drv->format_name, device);
1244 return;
1245 }
1246
1247 if (!strlen(name)) {
1248 error_setg(errp, "Name is empty");
1249 return;
1250 }
1251
1252 /* check whether a snapshot with name exist */
1253 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1254 &local_err);
1255 if (local_err) {
1256 error_propagate(errp, local_err);
1257 return;
1258 } else if (ret) {
1259 error_setg(errp,
1260 "Snapshot with name '%s' already exists on device '%s'",
1261 name, device);
1262 return;
1263 }
1264
1265 /* 3. take the snapshot */
1266 sn = &state->sn;
1267 pstrcpy(sn->name, sizeof(sn->name), name);
1268 rt = g_get_real_time();
1269 sn->date_sec = rt / G_USEC_PER_SEC;
1270 sn->date_nsec = (rt % G_USEC_PER_SEC) * 1000;
1271 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1272 if (replay_mode != REPLAY_MODE_NONE) {
1273 sn->icount = replay_get_current_icount();
1274 } else {
1275 sn->icount = -1ULL;
1276 }
1277
1278 ret1 = bdrv_snapshot_create(bs, sn);
1279 if (ret1 < 0) {
1280 error_setg_errno(errp, -ret1,
1281 "Failed to create snapshot '%s' on device '%s'",
1282 name, device);
1283 return;
1284 }
1285
1286 /* 4. succeed, mark a snapshot is created */
1287 state->created = true;
1288 }
1289
1290 static void internal_snapshot_abort(void *opaque)
1291 {
1292 InternalSnapshotState *state = opaque;
1293 BlockDriverState *bs = state->bs;
1294 QEMUSnapshotInfo *sn = &state->sn;
1295 Error *local_error = NULL;
1296
1297 GLOBAL_STATE_CODE();
1298 GRAPH_RDLOCK_GUARD_MAINLOOP();
1299
1300 if (!state->created) {
1301 return;
1302 }
1303
1304 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1305 error_reportf_err(local_error,
1306 "Failed to delete snapshot with id '%s' and "
1307 "name '%s' on device '%s' in abort: ",
1308 sn->id_str, sn->name,
1309 bdrv_get_device_name(bs));
1310 }
1311 }
1312
1313 static void internal_snapshot_clean(void *opaque)
1314 {
1315 g_autofree InternalSnapshotState *state = opaque;
1316
1317 if (!state->bs) {
1318 return;
1319 }
1320
1321 bdrv_drained_end(state->bs);
1322 }
1323
1324 /* external snapshot private data */
1325 typedef struct ExternalSnapshotState {
1326 BlockDriverState *old_bs;
1327 BlockDriverState *new_bs;
1328 bool overlay_appended;
1329 } ExternalSnapshotState;
1330
1331 static void external_snapshot_commit(void *opaque);
1332 static void external_snapshot_abort(void *opaque);
1333 static void external_snapshot_clean(void *opaque);
1334 TransactionActionDrv external_snapshot_drv = {
1335 .commit = external_snapshot_commit,
1336 .abort = external_snapshot_abort,
1337 .clean = external_snapshot_clean,
1338 };
1339
1340 static void external_snapshot_action(TransactionAction *action,
1341 Transaction *tran, Error **errp)
1342 {
1343 int ret;
1344 int flags = 0;
1345 QDict *options = NULL;
1346 Error *local_err = NULL;
1347 /* Device and node name of the image to generate the snapshot from */
1348 const char *device;
1349 const char *node_name;
1350 /* Reference to the new image (for 'blockdev-snapshot') */
1351 const char *snapshot_ref;
1352 /* File name of the new image (for 'blockdev-snapshot-sync') */
1353 const char *new_image_file;
1354 ExternalSnapshotState *state = g_new0(ExternalSnapshotState, 1);
1355 uint64_t perm, shared;
1356
1357 /* TODO We'll eventually have to take a writer lock in this function */
1358 GRAPH_RDLOCK_GUARD_MAINLOOP();
1359
1360 tran_add(tran, &external_snapshot_drv, state);
1361
1362 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1363 * purpose but a different set of parameters */
1364 switch (action->type) {
1365 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1366 {
1367 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1368 device = s->node;
1369 node_name = s->node;
1370 new_image_file = NULL;
1371 snapshot_ref = s->overlay;
1372 }
1373 break;
1374 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1375 {
1376 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1377 device = s->device;
1378 node_name = s->node_name;
1379 new_image_file = s->snapshot_file;
1380 snapshot_ref = NULL;
1381 }
1382 break;
1383 default:
1384 g_assert_not_reached();
1385 }
1386
1387 /* start processing */
1388
1389 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1390 if (!state->old_bs) {
1391 return;
1392 }
1393
1394 /* Paired with .clean() */
1395 bdrv_drained_begin(state->old_bs);
1396
1397 if (!bdrv_is_inserted(state->old_bs)) {
1398 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM,
1399 bdrv_get_device_or_node_name(state->old_bs));
1400 return;
1401 }
1402
1403 if (bdrv_op_is_blocked(state->old_bs,
1404 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1405 return;
1406 }
1407
1408 if (!bdrv_is_read_only(state->old_bs)) {
1409 if (bdrv_flush(state->old_bs)) {
1410 error_setg(errp, QERR_IO_ERROR);
1411 return;
1412 }
1413 }
1414
1415 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1416 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1417 const char *format = s->format ?: "qcow2";
1418 enum NewImageMode mode;
1419 const char *snapshot_node_name = s->snapshot_node_name;
1420
1421 if (node_name && !snapshot_node_name) {
1422 error_setg(errp, "New overlay node-name missing");
1423 return;
1424 }
1425
1426 if (snapshot_node_name &&
1427 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1428 error_setg(errp, "New overlay node-name already in use");
1429 return;
1430 }
1431
1432 flags = state->old_bs->open_flags;
1433 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1434 flags |= BDRV_O_NO_BACKING;
1435
1436 /* create new image w/backing file */
1437 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1438 if (mode != NEW_IMAGE_MODE_EXISTING) {
1439 int64_t size = bdrv_getlength(state->old_bs);
1440 if (size < 0) {
1441 error_setg_errno(errp, -size, "bdrv_getlength failed");
1442 return;
1443 }
1444 bdrv_refresh_filename(state->old_bs);
1445
1446 bdrv_img_create(new_image_file, format,
1447 state->old_bs->filename,
1448 state->old_bs->drv->format_name,
1449 NULL, size, flags, false, &local_err);
1450
1451 if (local_err) {
1452 error_propagate(errp, local_err);
1453 return;
1454 }
1455 }
1456
1457 options = qdict_new();
1458 if (snapshot_node_name) {
1459 qdict_put_str(options, "node-name", snapshot_node_name);
1460 }
1461 qdict_put_str(options, "driver", format);
1462 }
1463
1464 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1465 errp);
1466
1467 /* We will manually add the backing_hd field to the bs later */
1468 if (!state->new_bs) {
1469 return;
1470 }
1471
1472 /*
1473 * Allow attaching a backing file to an overlay that's already in use only
1474 * if the parents don't assume that they are already seeing a valid image.
1475 * (Specifically, allow it as a mirror target, which is write-only access.)
1476 */
1477 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared);
1478 if (perm & BLK_PERM_CONSISTENT_READ) {
1479 error_setg(errp, "The overlay is already in use");
1480 return;
1481 }
1482
1483 if (state->new_bs->drv->is_filter) {
1484 error_setg(errp, "Filters cannot be used as overlays");
1485 return;
1486 }
1487
1488 if (bdrv_cow_child(state->new_bs)) {
1489 error_setg(errp, "The overlay already has a backing image");
1490 return;
1491 }
1492
1493 if (!state->new_bs->drv->supports_backing) {
1494 error_setg(errp, "The overlay does not support backing images");
1495 return;
1496 }
1497
1498 ret = bdrv_append(state->new_bs, state->old_bs, errp);
1499 if (ret < 0) {
1500 return;
1501 }
1502 state->overlay_appended = true;
1503 }
1504
1505 static void external_snapshot_commit(void *opaque)
1506 {
1507 ExternalSnapshotState *state = opaque;
1508
1509 /* We don't need (or want) to use the transactional
1510 * bdrv_reopen_multiple() across all the entries at once, because we
1511 * don't want to abort all of them if one of them fails the reopen */
1512 if (!qatomic_read(&state->old_bs->copy_on_read)) {
1513 bdrv_reopen_set_read_only(state->old_bs, true, NULL);
1514 }
1515 }
1516
1517 static void external_snapshot_abort(void *opaque)
1518 {
1519 ExternalSnapshotState *state = opaque;
1520 if (state->new_bs) {
1521 if (state->overlay_appended) {
1522 AioContext *aio_context;
1523 AioContext *tmp_context;
1524 int ret;
1525
1526 aio_context = bdrv_get_aio_context(state->old_bs);
1527
1528 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1529 close state->old_bs; we need it */
1530 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1531
1532 /*
1533 * The call to bdrv_set_backing_hd() above returns state->old_bs to
1534 * the main AioContext. As we're still going to be using it, return
1535 * it to the AioContext it was before.
1536 */
1537 tmp_context = bdrv_get_aio_context(state->old_bs);
1538 if (aio_context != tmp_context) {
1539 ret = bdrv_try_change_aio_context(state->old_bs,
1540 aio_context, NULL, NULL);
1541 assert(ret == 0);
1542 }
1543
1544 bdrv_drained_begin(state->new_bs);
1545 bdrv_graph_wrlock();
1546 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1547 bdrv_graph_wrunlock();
1548 bdrv_drained_end(state->new_bs);
1549
1550 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1551 }
1552 }
1553 }
1554
1555 static void external_snapshot_clean(void *opaque)
1556 {
1557 g_autofree ExternalSnapshotState *state = opaque;
1558
1559 if (!state->old_bs) {
1560 return;
1561 }
1562
1563 bdrv_drained_end(state->old_bs);
1564 bdrv_unref(state->new_bs);
1565 }
1566
1567 typedef struct DriveBackupState {
1568 BlockDriverState *bs;
1569 BlockJob *job;
1570 } DriveBackupState;
1571
1572 static BlockJob *do_backup_common(BackupCommon *backup,
1573 BlockDriverState *bs,
1574 BlockDriverState *target_bs,
1575 AioContext *aio_context,
1576 JobTxn *txn, Error **errp);
1577
1578 static void drive_backup_commit(void *opaque);
1579 static void drive_backup_abort(void *opaque);
1580 static void drive_backup_clean(void *opaque);
1581 TransactionActionDrv drive_backup_drv = {
1582 .commit = drive_backup_commit,
1583 .abort = drive_backup_abort,
1584 .clean = drive_backup_clean,
1585 };
1586
1587 static void drive_backup_action(DriveBackup *backup,
1588 JobTxn *block_job_txn,
1589 Transaction *tran, Error **errp)
1590 {
1591 DriveBackupState *state = g_new0(DriveBackupState, 1);
1592 BlockDriverState *bs;
1593 BlockDriverState *target_bs;
1594 BlockDriverState *source = NULL;
1595 AioContext *aio_context;
1596 const char *format;
1597 QDict *options;
1598 Error *local_err = NULL;
1599 int flags;
1600 int64_t size;
1601 bool set_backing_hd = false;
1602 int ret;
1603
1604 GLOBAL_STATE_CODE();
1605
1606 tran_add(tran, &drive_backup_drv, state);
1607
1608 if (!backup->has_mode) {
1609 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1610 }
1611
1612 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1613 if (!bs) {
1614 return;
1615 }
1616
1617 if (!bs->drv) {
1618 error_setg(errp, "Device has no medium");
1619 return;
1620 }
1621
1622 aio_context = bdrv_get_aio_context(bs);
1623
1624 state->bs = bs;
1625 /* Paired with .clean() */
1626 bdrv_drained_begin(bs);
1627
1628 format = backup->format;
1629 if (!format && backup->mode != NEW_IMAGE_MODE_EXISTING) {
1630 format = bs->drv->format_name;
1631 }
1632
1633 /* Early check to avoid creating target */
1634 bdrv_graph_rdlock_main_loop();
1635 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
1636 bdrv_graph_rdunlock_main_loop();
1637 return;
1638 }
1639
1640 flags = bs->open_flags | BDRV_O_RDWR;
1641
1642 /*
1643 * See if we have a backing HD we can use to create our new image
1644 * on top of.
1645 */
1646 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
1647 /*
1648 * Backup will not replace the source by the target, so none
1649 * of the filters skipped here will be removed (in contrast to
1650 * mirror). Therefore, we can skip all of them when looking
1651 * for the first COW relationship.
1652 */
1653 source = bdrv_cow_bs(bdrv_skip_filters(bs));
1654 if (!source) {
1655 backup->sync = MIRROR_SYNC_MODE_FULL;
1656 }
1657 }
1658 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
1659 source = bs;
1660 flags |= BDRV_O_NO_BACKING;
1661 set_backing_hd = true;
1662 }
1663 bdrv_graph_rdunlock_main_loop();
1664
1665 size = bdrv_getlength(bs);
1666 if (size < 0) {
1667 error_setg_errno(errp, -size, "bdrv_getlength failed");
1668 return;
1669 }
1670
1671 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
1672 assert(format);
1673 if (source) {
1674 /* Implicit filters should not appear in the filename */
1675 BlockDriverState *explicit_backing;
1676
1677 bdrv_graph_rdlock_main_loop();
1678 explicit_backing = bdrv_skip_implicit_filters(source);
1679 bdrv_refresh_filename(explicit_backing);
1680 bdrv_graph_rdunlock_main_loop();
1681
1682 bdrv_img_create(backup->target, format,
1683 explicit_backing->filename,
1684 explicit_backing->drv->format_name, NULL,
1685 size, flags, false, &local_err);
1686 } else {
1687 bdrv_img_create(backup->target, format, NULL, NULL, NULL,
1688 size, flags, false, &local_err);
1689 }
1690 }
1691
1692 if (local_err) {
1693 error_propagate(errp, local_err);
1694 return;
1695 }
1696
1697 options = qdict_new();
1698 qdict_put_str(options, "discard", "unmap");
1699 qdict_put_str(options, "detect-zeroes", "unmap");
1700 if (format) {
1701 qdict_put_str(options, "driver", format);
1702 }
1703
1704 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
1705 if (!target_bs) {
1706 return;
1707 }
1708
1709 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
1710 if (ret < 0) {
1711 bdrv_unref(target_bs);
1712 return;
1713 }
1714
1715 if (set_backing_hd) {
1716 if (bdrv_set_backing_hd(target_bs, source, errp) < 0) {
1717 goto unref;
1718 }
1719 }
1720
1721 state->job = do_backup_common(qapi_DriveBackup_base(backup),
1722 bs, target_bs, aio_context,
1723 block_job_txn, errp);
1724
1725 unref:
1726 bdrv_unref(target_bs);
1727 }
1728
1729 static void drive_backup_commit(void *opaque)
1730 {
1731 DriveBackupState *state = opaque;
1732
1733 assert(state->job);
1734 job_start(&state->job->job);
1735 }
1736
1737 static void drive_backup_abort(void *opaque)
1738 {
1739 DriveBackupState *state = opaque;
1740
1741 if (state->job) {
1742 job_cancel_sync(&state->job->job, true);
1743 }
1744 }
1745
1746 static void drive_backup_clean(void *opaque)
1747 {
1748 g_autofree DriveBackupState *state = opaque;
1749
1750 if (!state->bs) {
1751 return;
1752 }
1753
1754 bdrv_drained_end(state->bs);
1755 }
1756
1757 typedef struct BlockdevBackupState {
1758 BlockDriverState *bs;
1759 BlockJob *job;
1760 } BlockdevBackupState;
1761
1762 static void blockdev_backup_commit(void *opaque);
1763 static void blockdev_backup_abort(void *opaque);
1764 static void blockdev_backup_clean(void *opaque);
1765 TransactionActionDrv blockdev_backup_drv = {
1766 .commit = blockdev_backup_commit,
1767 .abort = blockdev_backup_abort,
1768 .clean = blockdev_backup_clean,
1769 };
1770
1771 static void blockdev_backup_action(BlockdevBackup *backup,
1772 JobTxn *block_job_txn,
1773 Transaction *tran, Error **errp)
1774 {
1775 BlockdevBackupState *state = g_new0(BlockdevBackupState, 1);
1776 BlockDriverState *bs;
1777 BlockDriverState *target_bs;
1778 AioContext *aio_context;
1779 int ret;
1780
1781 tran_add(tran, &blockdev_backup_drv, state);
1782
1783 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1784 if (!bs) {
1785 return;
1786 }
1787
1788 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
1789 if (!target_bs) {
1790 return;
1791 }
1792
1793 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */
1794 aio_context = bdrv_get_aio_context(bs);
1795
1796 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
1797 if (ret < 0) {
1798 return;
1799 }
1800
1801 state->bs = bs;
1802
1803 /* Paired with .clean() */
1804 bdrv_drained_begin(state->bs);
1805
1806 state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
1807 bs, target_bs, aio_context,
1808 block_job_txn, errp);
1809 }
1810
1811 static void blockdev_backup_commit(void *opaque)
1812 {
1813 BlockdevBackupState *state = opaque;
1814
1815 assert(state->job);
1816 job_start(&state->job->job);
1817 }
1818
1819 static void blockdev_backup_abort(void *opaque)
1820 {
1821 BlockdevBackupState *state = opaque;
1822
1823 if (state->job) {
1824 job_cancel_sync(&state->job->job, true);
1825 }
1826 }
1827
1828 static void blockdev_backup_clean(void *opaque)
1829 {
1830 g_autofree BlockdevBackupState *state = opaque;
1831
1832 if (!state->bs) {
1833 return;
1834 }
1835
1836 bdrv_drained_end(state->bs);
1837 }
1838
1839 typedef struct BlockDirtyBitmapState {
1840 BdrvDirtyBitmap *bitmap;
1841 BlockDriverState *bs;
1842 HBitmap *backup;
1843 bool was_enabled;
1844 } BlockDirtyBitmapState;
1845
1846 static void block_dirty_bitmap_add_abort(void *opaque);
1847 TransactionActionDrv block_dirty_bitmap_add_drv = {
1848 .abort = block_dirty_bitmap_add_abort,
1849 .clean = g_free,
1850 };
1851
1852 static void block_dirty_bitmap_add_action(BlockDirtyBitmapAdd *action,
1853 Transaction *tran, Error **errp)
1854 {
1855 Error *local_err = NULL;
1856 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1857
1858 tran_add(tran, &block_dirty_bitmap_add_drv, state);
1859
1860 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1861 qmp_block_dirty_bitmap_add(action->node, action->name,
1862 action->has_granularity, action->granularity,
1863 action->has_persistent, action->persistent,
1864 action->has_disabled, action->disabled,
1865 &local_err);
1866
1867 if (!local_err) {
1868 state->bitmap = block_dirty_bitmap_lookup(action->node, action->name,
1869 NULL, &error_abort);
1870 } else {
1871 error_propagate(errp, local_err);
1872 }
1873 }
1874
1875 static void block_dirty_bitmap_add_abort(void *opaque)
1876 {
1877 BlockDirtyBitmapState *state = opaque;
1878
1879 if (state->bitmap) {
1880 bdrv_release_dirty_bitmap(state->bitmap);
1881 }
1882 }
1883
1884 static void block_dirty_bitmap_restore(void *opaque);
1885 static void block_dirty_bitmap_free_backup(void *opaque);
1886 TransactionActionDrv block_dirty_bitmap_clear_drv = {
1887 .abort = block_dirty_bitmap_restore,
1888 .commit = block_dirty_bitmap_free_backup,
1889 .clean = g_free,
1890 };
1891
1892 static void block_dirty_bitmap_clear_action(BlockDirtyBitmap *action,
1893 Transaction *tran, Error **errp)
1894 {
1895 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1896
1897 tran_add(tran, &block_dirty_bitmap_clear_drv, state);
1898
1899 state->bitmap = block_dirty_bitmap_lookup(action->node,
1900 action->name,
1901 &state->bs,
1902 errp);
1903 if (!state->bitmap) {
1904 return;
1905 }
1906
1907 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
1908 return;
1909 }
1910
1911 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
1912 }
1913
1914 static void block_dirty_bitmap_restore(void *opaque)
1915 {
1916 BlockDirtyBitmapState *state = opaque;
1917
1918 if (state->backup) {
1919 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
1920 }
1921 }
1922
1923 static void block_dirty_bitmap_free_backup(void *opaque)
1924 {
1925 BlockDirtyBitmapState *state = opaque;
1926
1927 hbitmap_free(state->backup);
1928 }
1929
1930 static void block_dirty_bitmap_enable_abort(void *opaque);
1931 TransactionActionDrv block_dirty_bitmap_enable_drv = {
1932 .abort = block_dirty_bitmap_enable_abort,
1933 .clean = g_free,
1934 };
1935
1936 static void block_dirty_bitmap_enable_action(BlockDirtyBitmap *action,
1937 Transaction *tran, Error **errp)
1938 {
1939 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1940
1941 tran_add(tran, &block_dirty_bitmap_enable_drv, state);
1942
1943 state->bitmap = block_dirty_bitmap_lookup(action->node,
1944 action->name,
1945 NULL,
1946 errp);
1947 if (!state->bitmap) {
1948 return;
1949 }
1950
1951 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
1952 return;
1953 }
1954
1955 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
1956 bdrv_enable_dirty_bitmap(state->bitmap);
1957 }
1958
1959 static void block_dirty_bitmap_enable_abort(void *opaque)
1960 {
1961 BlockDirtyBitmapState *state = opaque;
1962
1963 if (!state->was_enabled) {
1964 bdrv_disable_dirty_bitmap(state->bitmap);
1965 }
1966 }
1967
1968 static void block_dirty_bitmap_disable_abort(void *opaque);
1969 TransactionActionDrv block_dirty_bitmap_disable_drv = {
1970 .abort = block_dirty_bitmap_disable_abort,
1971 .clean = g_free,
1972 };
1973
1974 static void block_dirty_bitmap_disable_action(BlockDirtyBitmap *action,
1975 Transaction *tran, Error **errp)
1976 {
1977 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1978
1979 tran_add(tran, &block_dirty_bitmap_disable_drv, state);
1980
1981 state->bitmap = block_dirty_bitmap_lookup(action->node,
1982 action->name,
1983 NULL,
1984 errp);
1985 if (!state->bitmap) {
1986 return;
1987 }
1988
1989 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
1990 return;
1991 }
1992
1993 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
1994 bdrv_disable_dirty_bitmap(state->bitmap);
1995 }
1996
1997 static void block_dirty_bitmap_disable_abort(void *opaque)
1998 {
1999 BlockDirtyBitmapState *state = opaque;
2000
2001 if (state->was_enabled) {
2002 bdrv_enable_dirty_bitmap(state->bitmap);
2003 }
2004 }
2005
2006 TransactionActionDrv block_dirty_bitmap_merge_drv = {
2007 .commit = block_dirty_bitmap_free_backup,
2008 .abort = block_dirty_bitmap_restore,
2009 .clean = g_free,
2010 };
2011
2012 static void block_dirty_bitmap_merge_action(BlockDirtyBitmapMerge *action,
2013 Transaction *tran, Error **errp)
2014 {
2015 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2016
2017 tran_add(tran, &block_dirty_bitmap_merge_drv, state);
2018
2019 state->bitmap = block_dirty_bitmap_merge(action->node, action->target,
2020 action->bitmaps, &state->backup,
2021 errp);
2022 }
2023
2024 static void block_dirty_bitmap_remove_commit(void *opaque);
2025 static void block_dirty_bitmap_remove_abort(void *opaque);
2026 TransactionActionDrv block_dirty_bitmap_remove_drv = {
2027 .commit = block_dirty_bitmap_remove_commit,
2028 .abort = block_dirty_bitmap_remove_abort,
2029 .clean = g_free,
2030 };
2031
2032 static void block_dirty_bitmap_remove_action(BlockDirtyBitmap *action,
2033 Transaction *tran, Error **errp)
2034 {
2035 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2036
2037 tran_add(tran, &block_dirty_bitmap_remove_drv, state);
2038
2039
2040 state->bitmap = block_dirty_bitmap_remove(action->node, action->name,
2041 false, &state->bs, errp);
2042 if (state->bitmap) {
2043 bdrv_dirty_bitmap_skip_store(state->bitmap, true);
2044 bdrv_dirty_bitmap_set_busy(state->bitmap, true);
2045 }
2046 }
2047
2048 static void block_dirty_bitmap_remove_abort(void *opaque)
2049 {
2050 BlockDirtyBitmapState *state = opaque;
2051
2052 if (state->bitmap) {
2053 bdrv_dirty_bitmap_skip_store(state->bitmap, false);
2054 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2055 }
2056 }
2057
2058 static void block_dirty_bitmap_remove_commit(void *opaque)
2059 {
2060 BlockDirtyBitmapState *state = opaque;
2061
2062 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2063 bdrv_release_dirty_bitmap(state->bitmap);
2064 }
2065
2066 static void abort_commit(void *opaque);
2067 TransactionActionDrv abort_drv = {
2068 .commit = abort_commit,
2069 };
2070
2071 static void abort_action(Transaction *tran, Error **errp)
2072 {
2073 tran_add(tran, &abort_drv, NULL);
2074 error_setg(errp, "Transaction aborted using Abort action");
2075 }
2076
2077 static void abort_commit(void *opaque)
2078 {
2079 g_assert_not_reached(); /* this action never succeeds */
2080 }
2081
2082 static void transaction_action(TransactionAction *act, JobTxn *block_job_txn,
2083 Transaction *tran, Error **errp)
2084 {
2085 switch (act->type) {
2086 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
2087 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
2088 external_snapshot_action(act, tran, errp);
2089 return;
2090 case TRANSACTION_ACTION_KIND_DRIVE_BACKUP:
2091 drive_backup_action(act->u.drive_backup.data,
2092 block_job_txn, tran, errp);
2093 return;
2094 case TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP:
2095 blockdev_backup_action(act->u.blockdev_backup.data,
2096 block_job_txn, tran, errp);
2097 return;
2098 case TRANSACTION_ACTION_KIND_ABORT:
2099 abort_action(tran, errp);
2100 return;
2101 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC:
2102 internal_snapshot_action(act->u.blockdev_snapshot_internal_sync.data,
2103 tran, errp);
2104 return;
2105 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD:
2106 block_dirty_bitmap_add_action(act->u.block_dirty_bitmap_add.data,
2107 tran, errp);
2108 return;
2109 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR:
2110 block_dirty_bitmap_clear_action(act->u.block_dirty_bitmap_clear.data,
2111 tran, errp);
2112 return;
2113 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE:
2114 block_dirty_bitmap_enable_action(act->u.block_dirty_bitmap_enable.data,
2115 tran, errp);
2116 return;
2117 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE:
2118 block_dirty_bitmap_disable_action(
2119 act->u.block_dirty_bitmap_disable.data, tran, errp);
2120 return;
2121 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE:
2122 block_dirty_bitmap_merge_action(act->u.block_dirty_bitmap_merge.data,
2123 tran, errp);
2124 return;
2125 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE:
2126 block_dirty_bitmap_remove_action(act->u.block_dirty_bitmap_remove.data,
2127 tran, errp);
2128 return;
2129 /*
2130 * Where are transactions for MIRROR, COMMIT and STREAM?
2131 * Although these blockjobs use transaction callbacks like the backup job,
2132 * these jobs do not necessarily adhere to transaction semantics.
2133 * These jobs may not fully undo all of their actions on abort, nor do they
2134 * necessarily work in transactions with more than one job in them.
2135 */
2136 case TRANSACTION_ACTION_KIND__MAX:
2137 default:
2138 g_assert_not_reached();
2139 };
2140 }
2141
2142
2143 /*
2144 * 'Atomic' group operations. The operations are performed as a set, and if
2145 * any fail then we roll back all operations in the group.
2146 *
2147 * Always run under BQL.
2148 */
2149 void qmp_transaction(TransactionActionList *actions,
2150 struct TransactionProperties *properties,
2151 Error **errp)
2152 {
2153 TransactionActionList *act;
2154 JobTxn *block_job_txn = NULL;
2155 Error *local_err = NULL;
2156 Transaction *tran;
2157 ActionCompletionMode comp_mode =
2158 properties ? properties->completion_mode :
2159 ACTION_COMPLETION_MODE_INDIVIDUAL;
2160
2161 GLOBAL_STATE_CODE();
2162
2163 /* Does this transaction get canceled as a group on failure?
2164 * If not, we don't really need to make a JobTxn.
2165 */
2166 if (comp_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2167 for (act = actions; act; act = act->next) {
2168 TransactionActionKind type = act->value->type;
2169
2170 if (type != TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP &&
2171 type != TRANSACTION_ACTION_KIND_DRIVE_BACKUP)
2172 {
2173 error_setg(errp,
2174 "Action '%s' does not support transaction property "
2175 "completion-mode = %s",
2176 TransactionActionKind_str(type),
2177 ActionCompletionMode_str(comp_mode));
2178 return;
2179 }
2180 }
2181
2182 block_job_txn = job_txn_new();
2183 }
2184
2185 /* drain all i/o before any operations */
2186 bdrv_drain_all();
2187
2188 tran = tran_new();
2189
2190 /* We don't do anything in this loop that commits us to the operations */
2191 for (act = actions; act; act = act->next) {
2192 transaction_action(act->value, block_job_txn, tran, &local_err);
2193 if (local_err) {
2194 error_propagate(errp, local_err);
2195 goto delete_and_fail;
2196 }
2197 }
2198
2199 tran_commit(tran);
2200
2201 /* success */
2202 goto exit;
2203
2204 delete_and_fail:
2205 /* failure, and it is all-or-none; roll back all operations */
2206 tran_abort(tran);
2207 exit:
2208 job_txn_unref(block_job_txn);
2209 }
2210
2211 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2212 const char *name,
2213 Error **errp)
2214 {
2215 BdrvDirtyBitmap *bitmap;
2216 BlockDriverState *bs;
2217 BlockDirtyBitmapSha256 *ret = NULL;
2218 char *sha256;
2219
2220 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2221 if (!bitmap || !bs) {
2222 return NULL;
2223 }
2224
2225 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2226 if (sha256 == NULL) {
2227 return NULL;
2228 }
2229
2230 ret = g_new(BlockDirtyBitmapSha256, 1);
2231 ret->sha256 = sha256;
2232
2233 return ret;
2234 }
2235
2236 void coroutine_fn qmp_block_resize(const char *device, const char *node_name,
2237 int64_t size, Error **errp)
2238 {
2239 Error *local_err = NULL;
2240 BlockBackend *blk;
2241 BlockDriverState *bs;
2242 AioContext *old_ctx;
2243
2244 bs = bdrv_lookup_bs(device, node_name, &local_err);
2245 if (local_err) {
2246 error_propagate(errp, local_err);
2247 return;
2248 }
2249
2250 if (size < 0) {
2251 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2252 return;
2253 }
2254
2255 bdrv_graph_co_rdlock();
2256 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, errp)) {
2257 bdrv_graph_co_rdunlock();
2258 return;
2259 }
2260 bdrv_graph_co_rdunlock();
2261
2262 blk = blk_co_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp);
2263 if (!blk) {
2264 return;
2265 }
2266
2267 bdrv_drained_begin(bs);
2268
2269 old_ctx = bdrv_co_enter(bs);
2270 blk_co_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
2271 bdrv_co_leave(bs, old_ctx);
2272
2273 bdrv_drained_end(bs);
2274 blk_co_unref(blk);
2275 }
2276
2277 void qmp_block_stream(const char *job_id, const char *device,
2278 const char *base,
2279 const char *base_node,
2280 const char *backing_file,
2281 bool has_backing_mask_protocol,
2282 bool backing_mask_protocol,
2283 const char *bottom,
2284 bool has_speed, int64_t speed,
2285 bool has_on_error, BlockdevOnError on_error,
2286 const char *filter_node_name,
2287 bool has_auto_finalize, bool auto_finalize,
2288 bool has_auto_dismiss, bool auto_dismiss,
2289 Error **errp)
2290 {
2291 BlockDriverState *bs, *iter, *iter_end;
2292 BlockDriverState *base_bs = NULL;
2293 BlockDriverState *bottom_bs = NULL;
2294 AioContext *aio_context;
2295 Error *local_err = NULL;
2296 int job_flags = JOB_DEFAULT;
2297
2298 GLOBAL_STATE_CODE();
2299
2300 if (base && base_node) {
2301 error_setg(errp, "'base' and 'base-node' cannot be specified "
2302 "at the same time");
2303 return;
2304 }
2305
2306 if (base && bottom) {
2307 error_setg(errp, "'base' and 'bottom' cannot be specified "
2308 "at the same time");
2309 return;
2310 }
2311
2312 if (bottom && base_node) {
2313 error_setg(errp, "'bottom' and 'base-node' cannot be specified "
2314 "at the same time");
2315 return;
2316 }
2317
2318 if (!has_backing_mask_protocol) {
2319 backing_mask_protocol = false;
2320 }
2321
2322 if (!has_on_error) {
2323 on_error = BLOCKDEV_ON_ERROR_REPORT;
2324 }
2325
2326 bs = bdrv_lookup_bs(device, device, errp);
2327 if (!bs) {
2328 return;
2329 }
2330
2331 aio_context = bdrv_get_aio_context(bs);
2332
2333 bdrv_graph_rdlock_main_loop();
2334 if (base) {
2335 base_bs = bdrv_find_backing_image(bs, base);
2336 if (base_bs == NULL) {
2337 error_setg(errp, "Can't find '%s' in the backing chain", base);
2338 goto out_rdlock;
2339 }
2340 assert(bdrv_get_aio_context(base_bs) == aio_context);
2341 }
2342
2343 if (base_node) {
2344 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2345 if (!base_bs) {
2346 goto out_rdlock;
2347 }
2348 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
2349 error_setg(errp, "Node '%s' is not a backing image of '%s'",
2350 base_node, device);
2351 goto out_rdlock;
2352 }
2353 assert(bdrv_get_aio_context(base_bs) == aio_context);
2354
2355 bdrv_refresh_filename(base_bs);
2356 }
2357
2358 if (bottom) {
2359 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp);
2360 if (!bottom_bs) {
2361 goto out_rdlock;
2362 }
2363 if (!bottom_bs->drv) {
2364 error_setg(errp, "Node '%s' is not open", bottom);
2365 goto out_rdlock;
2366 }
2367 if (bottom_bs->drv->is_filter) {
2368 error_setg(errp, "Node '%s' is a filter, use a non-filter node "
2369 "as 'bottom'", bottom);
2370 goto out_rdlock;
2371 }
2372 if (!bdrv_chain_contains(bs, bottom_bs)) {
2373 error_setg(errp, "Node '%s' is not in a chain starting from '%s'",
2374 bottom, device);
2375 goto out_rdlock;
2376 }
2377 assert(bdrv_get_aio_context(bottom_bs) == aio_context);
2378 }
2379
2380 /*
2381 * Check for op blockers in the whole chain between bs and base (or bottom)
2382 */
2383 iter_end = bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs;
2384 for (iter = bs; iter && iter != iter_end;
2385 iter = bdrv_filter_or_cow_bs(iter))
2386 {
2387 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
2388 goto out_rdlock;
2389 }
2390 }
2391 bdrv_graph_rdunlock_main_loop();
2392
2393 /* if we are streaming the entire chain, the result will have no backing
2394 * file, and specifying one is therefore an error */
2395 if (!base_bs && backing_file) {
2396 error_setg(errp, "backing file specified, but streaming the "
2397 "entire chain");
2398 return;
2399 }
2400
2401 if (has_auto_finalize && !auto_finalize) {
2402 job_flags |= JOB_MANUAL_FINALIZE;
2403 }
2404 if (has_auto_dismiss && !auto_dismiss) {
2405 job_flags |= JOB_MANUAL_DISMISS;
2406 }
2407
2408 stream_start(job_id, bs, base_bs, backing_file,
2409 backing_mask_protocol,
2410 bottom_bs, job_flags, has_speed ? speed : 0, on_error,
2411 filter_node_name, &local_err);
2412 if (local_err) {
2413 error_propagate(errp, local_err);
2414 return;
2415 }
2416
2417 trace_qmp_block_stream(bs);
2418 return;
2419
2420 out_rdlock:
2421 bdrv_graph_rdunlock_main_loop();
2422 }
2423
2424 void qmp_block_commit(const char *job_id, const char *device,
2425 const char *base_node,
2426 const char *base,
2427 const char *top_node,
2428 const char *top,
2429 const char *backing_file,
2430 bool has_backing_mask_protocol,
2431 bool backing_mask_protocol,
2432 bool has_speed, int64_t speed,
2433 bool has_on_error, BlockdevOnError on_error,
2434 const char *filter_node_name,
2435 bool has_auto_finalize, bool auto_finalize,
2436 bool has_auto_dismiss, bool auto_dismiss,
2437 Error **errp)
2438 {
2439 BlockDriverState *bs;
2440 BlockDriverState *iter;
2441 BlockDriverState *base_bs, *top_bs;
2442 AioContext *aio_context;
2443 Error *local_err = NULL;
2444 int job_flags = JOB_DEFAULT;
2445 uint64_t top_perm, top_shared;
2446
2447 /* TODO We'll eventually have to take a writer lock in this function */
2448 GRAPH_RDLOCK_GUARD_MAINLOOP();
2449
2450 if (!has_speed) {
2451 speed = 0;
2452 }
2453 if (!has_on_error) {
2454 on_error = BLOCKDEV_ON_ERROR_REPORT;
2455 }
2456 if (has_auto_finalize && !auto_finalize) {
2457 job_flags |= JOB_MANUAL_FINALIZE;
2458 }
2459 if (has_auto_dismiss && !auto_dismiss) {
2460 job_flags |= JOB_MANUAL_DISMISS;
2461 }
2462 if (!has_backing_mask_protocol) {
2463 backing_mask_protocol = false;
2464 }
2465
2466 /* Important Note:
2467 * libvirt relies on the DeviceNotFound error class in order to probe for
2468 * live commit feature versions; for this to work, we must make sure to
2469 * perform the device lookup before any generic errors that may occur in a
2470 * scenario in which all optional arguments are omitted. */
2471 bs = qmp_get_root_bs(device, &local_err);
2472 if (!bs) {
2473 bs = bdrv_lookup_bs(device, device, NULL);
2474 if (!bs) {
2475 error_free(local_err);
2476 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2477 "Device '%s' not found", device);
2478 } else {
2479 error_propagate(errp, local_err);
2480 }
2481 return;
2482 }
2483
2484 aio_context = bdrv_get_aio_context(bs);
2485
2486 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2487 return;
2488 }
2489
2490 /* default top_bs is the active layer */
2491 top_bs = bs;
2492
2493 if (top_node && top) {
2494 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
2495 return;
2496 } else if (top_node) {
2497 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
2498 if (top_bs == NULL) {
2499 return;
2500 }
2501 if (!bdrv_chain_contains(bs, top_bs)) {
2502 error_setg(errp, "'%s' is not in this backing file chain",
2503 top_node);
2504 return;
2505 }
2506 } else if (top) {
2507 /* This strcmp() is just a shortcut, there is no need to
2508 * refresh @bs's filename. If it mismatches,
2509 * bdrv_find_backing_image() will do the refresh and may still
2510 * return @bs. */
2511 if (strcmp(bs->filename, top) != 0) {
2512 top_bs = bdrv_find_backing_image(bs, top);
2513 }
2514 }
2515
2516 if (top_bs == NULL) {
2517 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2518 return;
2519 }
2520
2521 assert(bdrv_get_aio_context(top_bs) == aio_context);
2522
2523 if (base_node && base) {
2524 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
2525 return;
2526 } else if (base_node) {
2527 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2528 if (base_bs == NULL) {
2529 return;
2530 }
2531 if (!bdrv_chain_contains(top_bs, base_bs)) {
2532 error_setg(errp, "'%s' is not in this backing file chain",
2533 base_node);
2534 return;
2535 }
2536 } else if (base) {
2537 base_bs = bdrv_find_backing_image(top_bs, base);
2538 if (base_bs == NULL) {
2539 error_setg(errp, "Can't find '%s' in the backing chain", base);
2540 return;
2541 }
2542 } else {
2543 base_bs = bdrv_find_base(top_bs);
2544 if (base_bs == NULL) {
2545 error_setg(errp, "There is no backimg image");
2546 return;
2547 }
2548 }
2549
2550 assert(bdrv_get_aio_context(base_bs) == aio_context);
2551
2552 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs);
2553 iter = bdrv_filter_or_cow_bs(iter))
2554 {
2555 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2556 return;
2557 }
2558 }
2559
2560 /* Do not allow attempts to commit an image into itself */
2561 if (top_bs == base_bs) {
2562 error_setg(errp, "cannot commit an image into itself");
2563 return;
2564 }
2565
2566 /*
2567 * Active commit is required if and only if someone has taken a
2568 * WRITE permission on the top node. Historically, we have always
2569 * used active commit for top nodes, so continue that practice
2570 * lest we possibly break clients that rely on this behavior, e.g.
2571 * to later attach this node to a writing parent.
2572 * (Active commit is never really wrong.)
2573 */
2574 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared);
2575 if (top_perm & BLK_PERM_WRITE ||
2576 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs))
2577 {
2578 if (backing_file) {
2579 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) {
2580 error_setg(errp, "'backing-file' specified,"
2581 " but 'top' is the active layer");
2582 } else {
2583 error_setg(errp, "'backing-file' specified, but 'top' has a "
2584 "writer on it");
2585 }
2586 return;
2587 }
2588 if (!job_id) {
2589 /*
2590 * Emulate here what block_job_create() does, because it
2591 * is possible that @bs != @top_bs (the block job should
2592 * be named after @bs, even if @top_bs is the actual
2593 * source)
2594 */
2595 job_id = bdrv_get_device_name(bs);
2596 }
2597 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error,
2598 filter_node_name, NULL, NULL, false, &local_err);
2599 } else {
2600 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
2601 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2602 return;
2603 }
2604 commit_start(job_id, bs, base_bs, top_bs, job_flags,
2605 speed, on_error, backing_file,
2606 backing_mask_protocol,
2607 filter_node_name, &local_err);
2608 }
2609 if (local_err != NULL) {
2610 error_propagate(errp, local_err);
2611 return;
2612 }
2613 }
2614
2615 /* Common QMP interface for drive-backup and blockdev-backup */
2616 static BlockJob *do_backup_common(BackupCommon *backup,
2617 BlockDriverState *bs,
2618 BlockDriverState *target_bs,
2619 AioContext *aio_context,
2620 JobTxn *txn, Error **errp)
2621 {
2622 BlockJob *job = NULL;
2623 BdrvDirtyBitmap *bmap = NULL;
2624 BackupPerf perf = { .max_workers = 64 };
2625 int job_flags = JOB_DEFAULT;
2626
2627 if (!backup->has_speed) {
2628 backup->speed = 0;
2629 }
2630 if (!backup->has_on_source_error) {
2631 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2632 }
2633 if (!backup->has_on_target_error) {
2634 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2635 }
2636 if (!backup->has_auto_finalize) {
2637 backup->auto_finalize = true;
2638 }
2639 if (!backup->has_auto_dismiss) {
2640 backup->auto_dismiss = true;
2641 }
2642 if (!backup->has_compress) {
2643 backup->compress = false;
2644 }
2645
2646 if (backup->x_perf) {
2647 if (backup->x_perf->has_use_copy_range) {
2648 perf.use_copy_range = backup->x_perf->use_copy_range;
2649 }
2650 if (backup->x_perf->has_max_workers) {
2651 perf.max_workers = backup->x_perf->max_workers;
2652 }
2653 if (backup->x_perf->has_max_chunk) {
2654 perf.max_chunk = backup->x_perf->max_chunk;
2655 }
2656 }
2657
2658 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
2659 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
2660 /* done before desugaring 'incremental' to print the right message */
2661 if (!backup->bitmap) {
2662 error_setg(errp, "must provide a valid bitmap name for "
2663 "'%s' sync mode", MirrorSyncMode_str(backup->sync));
2664 return NULL;
2665 }
2666 }
2667
2668 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) {
2669 if (backup->has_bitmap_mode &&
2670 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) {
2671 error_setg(errp, "Bitmap sync mode must be '%s' "
2672 "when using sync mode '%s'",
2673 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS),
2674 MirrorSyncMode_str(backup->sync));
2675 return NULL;
2676 }
2677 backup->has_bitmap_mode = true;
2678 backup->sync = MIRROR_SYNC_MODE_BITMAP;
2679 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS;
2680 }
2681
2682 if (backup->bitmap) {
2683 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
2684 if (!bmap) {
2685 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
2686 return NULL;
2687 }
2688 if (!backup->has_bitmap_mode) {
2689 error_setg(errp, "Bitmap sync mode must be given "
2690 "when providing a bitmap");
2691 return NULL;
2692 }
2693 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2694 return NULL;
2695 }
2696
2697 /* This does not produce a useful bitmap artifact: */
2698 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
2699 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap"
2700 " outputs", MirrorSyncMode_str(backup->sync));
2701 return NULL;
2702 }
2703
2704 /* If the bitmap isn't used for input or output, this is useless: */
2705 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER &&
2706 backup->sync != MIRROR_SYNC_MODE_BITMAP) {
2707 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect"
2708 " when combined with sync mode '%s'",
2709 BitmapSyncMode_str(backup->bitmap_mode),
2710 MirrorSyncMode_str(backup->sync));
2711 return NULL;
2712 }
2713 }
2714
2715 if (!backup->bitmap && backup->has_bitmap_mode) {
2716 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap");
2717 return NULL;
2718 }
2719
2720 if (!backup->auto_finalize) {
2721 job_flags |= JOB_MANUAL_FINALIZE;
2722 }
2723 if (!backup->auto_dismiss) {
2724 job_flags |= JOB_MANUAL_DISMISS;
2725 }
2726
2727 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
2728 backup->sync, bmap, backup->bitmap_mode,
2729 backup->compress,
2730 backup->filter_node_name,
2731 &perf,
2732 backup->on_source_error,
2733 backup->on_target_error,
2734 job_flags, NULL, NULL, txn, errp);
2735 return job;
2736 }
2737
2738 void qmp_drive_backup(DriveBackup *backup, Error **errp)
2739 {
2740 TransactionAction action = {
2741 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP,
2742 .u.drive_backup.data = backup,
2743 };
2744 blockdev_do_action(&action, errp);
2745 }
2746
2747 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
2748 bool flat,
2749 Error **errp)
2750 {
2751 bool return_flat = has_flat && flat;
2752
2753 return bdrv_named_nodes_list(return_flat, errp);
2754 }
2755
2756 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
2757 {
2758 GRAPH_RDLOCK_GUARD_MAINLOOP();
2759
2760 return bdrv_get_xdbg_block_graph(errp);
2761 }
2762
2763 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
2764 {
2765 TransactionAction action = {
2766 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
2767 .u.blockdev_backup.data = backup,
2768 };
2769 blockdev_do_action(&action, errp);
2770 }
2771
2772 /* Parameter check and block job starting for drive mirroring.
2773 * Caller should hold @device and @target's aio context (must be the same).
2774 **/
2775 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
2776 BlockDriverState *target,
2777 const char *replaces,
2778 enum MirrorSyncMode sync,
2779 BlockMirrorBackingMode backing_mode,
2780 bool zero_target,
2781 bool has_speed, int64_t speed,
2782 bool has_granularity, uint32_t granularity,
2783 bool has_buf_size, int64_t buf_size,
2784 bool has_on_source_error,
2785 BlockdevOnError on_source_error,
2786 bool has_on_target_error,
2787 BlockdevOnError on_target_error,
2788 bool has_unmap, bool unmap,
2789 const char *filter_node_name,
2790 bool has_copy_mode, MirrorCopyMode copy_mode,
2791 bool has_auto_finalize, bool auto_finalize,
2792 bool has_auto_dismiss, bool auto_dismiss,
2793 Error **errp)
2794 {
2795 BlockDriverState *unfiltered_bs;
2796 int job_flags = JOB_DEFAULT;
2797
2798 GLOBAL_STATE_CODE();
2799 GRAPH_RDLOCK_GUARD_MAINLOOP();
2800
2801 if (!has_speed) {
2802 speed = 0;
2803 }
2804 if (!has_on_source_error) {
2805 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2806 }
2807 if (!has_on_target_error) {
2808 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2809 }
2810 if (!has_granularity) {
2811 granularity = 0;
2812 }
2813 if (!has_buf_size) {
2814 buf_size = 0;
2815 }
2816 if (!has_unmap) {
2817 unmap = true;
2818 }
2819 if (!has_copy_mode) {
2820 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
2821 }
2822 if (has_auto_finalize && !auto_finalize) {
2823 job_flags |= JOB_MANUAL_FINALIZE;
2824 }
2825 if (has_auto_dismiss && !auto_dismiss) {
2826 job_flags |= JOB_MANUAL_DISMISS;
2827 }
2828
2829 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2830 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2831 "a value in range [512B, 64MB]");
2832 return;
2833 }
2834 if (granularity & (granularity - 1)) {
2835 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2836 "a power of 2");
2837 return;
2838 }
2839
2840 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
2841 return;
2842 }
2843 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
2844 return;
2845 }
2846
2847 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) {
2848 sync = MIRROR_SYNC_MODE_FULL;
2849 }
2850
2851 if (!replaces) {
2852 /* We want to mirror from @bs, but keep implicit filters on top */
2853 unfiltered_bs = bdrv_skip_implicit_filters(bs);
2854 if (unfiltered_bs != bs) {
2855 replaces = unfiltered_bs->node_name;
2856 }
2857 }
2858
2859 if (replaces) {
2860 BlockDriverState *to_replace_bs;
2861 int64_t bs_size, replace_size;
2862
2863 bs_size = bdrv_getlength(bs);
2864 if (bs_size < 0) {
2865 error_setg_errno(errp, -bs_size, "Failed to query device's size");
2866 return;
2867 }
2868
2869 to_replace_bs = check_to_replace_node(bs, replaces, errp);
2870 if (!to_replace_bs) {
2871 return;
2872 }
2873
2874 replace_size = bdrv_getlength(to_replace_bs);
2875
2876 if (replace_size < 0) {
2877 error_setg_errno(errp, -replace_size,
2878 "Failed to query the replacement node's size");
2879 return;
2880 }
2881 if (bs_size != replace_size) {
2882 error_setg(errp, "cannot replace image with a mirror image of "
2883 "different size");
2884 return;
2885 }
2886 }
2887
2888 /* pass the node name to replace to mirror start since it's loose coupling
2889 * and will allow to check whether the node still exist at mirror completion
2890 */
2891 mirror_start(job_id, bs, target,
2892 replaces, job_flags,
2893 speed, granularity, buf_size, sync, backing_mode, zero_target,
2894 on_source_error, on_target_error, unmap, filter_node_name,
2895 copy_mode, errp);
2896 }
2897
2898 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
2899 {
2900 BlockDriverState *bs;
2901 BlockDriverState *target_backing_bs, *target_bs;
2902 AioContext *aio_context;
2903 BlockMirrorBackingMode backing_mode;
2904 Error *local_err = NULL;
2905 QDict *options = NULL;
2906 int flags;
2907 int64_t size;
2908 const char *format = arg->format;
2909 bool zero_target;
2910 int ret;
2911
2912 bs = qmp_get_root_bs(arg->device, errp);
2913 if (!bs) {
2914 return;
2915 }
2916
2917 /* Early check to avoid creating target */
2918 bdrv_graph_rdlock_main_loop();
2919 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
2920 bdrv_graph_rdunlock_main_loop();
2921 return;
2922 }
2923
2924 aio_context = bdrv_get_aio_context(bs);
2925
2926 if (!arg->has_mode) {
2927 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2928 }
2929
2930 if (!arg->format) {
2931 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
2932 ? NULL : bs->drv->format_name);
2933 }
2934
2935 flags = bs->open_flags | BDRV_O_RDWR;
2936 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs));
2937 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) {
2938 arg->sync = MIRROR_SYNC_MODE_FULL;
2939 }
2940 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
2941 target_backing_bs = bs;
2942 }
2943 bdrv_graph_rdunlock_main_loop();
2944
2945 size = bdrv_getlength(bs);
2946 if (size < 0) {
2947 error_setg_errno(errp, -size, "bdrv_getlength failed");
2948 return;
2949 }
2950
2951 if (arg->replaces) {
2952 if (!arg->node_name) {
2953 error_setg(errp, "a node-name must be provided when replacing a"
2954 " named node of the graph");
2955 return;
2956 }
2957 }
2958
2959 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
2960 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
2961 } else {
2962 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
2963 }
2964
2965 /* Don't open backing image in create() */
2966 flags |= BDRV_O_NO_BACKING;
2967
2968 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs)
2969 && arg->mode != NEW_IMAGE_MODE_EXISTING)
2970 {
2971 /* create new image w/o backing file */
2972 assert(format);
2973 bdrv_img_create(arg->target, format,
2974 NULL, NULL, NULL, size, flags, false, &local_err);
2975 } else {
2976 BlockDriverState *explicit_backing;
2977
2978 switch (arg->mode) {
2979 case NEW_IMAGE_MODE_EXISTING:
2980 break;
2981 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2982 /*
2983 * Create new image with backing file.
2984 * Implicit filters should not appear in the filename.
2985 */
2986 bdrv_graph_rdlock_main_loop();
2987 explicit_backing = bdrv_skip_implicit_filters(target_backing_bs);
2988 bdrv_refresh_filename(explicit_backing);
2989 bdrv_graph_rdunlock_main_loop();
2990
2991 bdrv_img_create(arg->target, format,
2992 explicit_backing->filename,
2993 explicit_backing->drv->format_name,
2994 NULL, size, flags, false, &local_err);
2995 break;
2996 default:
2997 abort();
2998 }
2999 }
3000
3001 if (local_err) {
3002 error_propagate(errp, local_err);
3003 return;
3004 }
3005
3006 options = qdict_new();
3007 if (arg->node_name) {
3008 qdict_put_str(options, "node-name", arg->node_name);
3009 }
3010 if (format) {
3011 qdict_put_str(options, "driver", format);
3012 }
3013
3014 /* Mirroring takes care of copy-on-write using the source's backing
3015 * file.
3016 */
3017 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3018 if (!target_bs) {
3019 return;
3020 }
3021
3022 bdrv_graph_rdlock_main_loop();
3023 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
3024 (arg->mode == NEW_IMAGE_MODE_EXISTING ||
3025 !bdrv_has_zero_init(target_bs)));
3026 bdrv_graph_rdunlock_main_loop();
3027
3028
3029 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
3030 if (ret < 0) {
3031 bdrv_unref(target_bs);
3032 return;
3033 }
3034
3035 blockdev_mirror_common(arg->job_id, bs, target_bs,
3036 arg->replaces, arg->sync,
3037 backing_mode, zero_target,
3038 arg->has_speed, arg->speed,
3039 arg->has_granularity, arg->granularity,
3040 arg->has_buf_size, arg->buf_size,
3041 arg->has_on_source_error, arg->on_source_error,
3042 arg->has_on_target_error, arg->on_target_error,
3043 arg->has_unmap, arg->unmap,
3044 NULL,
3045 arg->has_copy_mode, arg->copy_mode,
3046 arg->has_auto_finalize, arg->auto_finalize,
3047 arg->has_auto_dismiss, arg->auto_dismiss,
3048 errp);
3049 bdrv_unref(target_bs);
3050 }
3051
3052 void qmp_blockdev_mirror(const char *job_id,
3053 const char *device, const char *target,
3054 const char *replaces,
3055 MirrorSyncMode sync,
3056 bool has_speed, int64_t speed,
3057 bool has_granularity, uint32_t granularity,
3058 bool has_buf_size, int64_t buf_size,
3059 bool has_on_source_error,
3060 BlockdevOnError on_source_error,
3061 bool has_on_target_error,
3062 BlockdevOnError on_target_error,
3063 const char *filter_node_name,
3064 bool has_copy_mode, MirrorCopyMode copy_mode,
3065 bool has_auto_finalize, bool auto_finalize,
3066 bool has_auto_dismiss, bool auto_dismiss,
3067 Error **errp)
3068 {
3069 BlockDriverState *bs;
3070 BlockDriverState *target_bs;
3071 AioContext *aio_context;
3072 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3073 bool zero_target;
3074 int ret;
3075
3076 bs = qmp_get_root_bs(device, errp);
3077 if (!bs) {
3078 return;
3079 }
3080
3081 target_bs = bdrv_lookup_bs(target, target, errp);
3082 if (!target_bs) {
3083 return;
3084 }
3085
3086 zero_target = (sync == MIRROR_SYNC_MODE_FULL);
3087
3088 aio_context = bdrv_get_aio_context(bs);
3089
3090 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
3091 if (ret < 0) {
3092 return;
3093 }
3094
3095 blockdev_mirror_common(job_id, bs, target_bs,
3096 replaces, sync, backing_mode,
3097 zero_target, has_speed, speed,
3098 has_granularity, granularity,
3099 has_buf_size, buf_size,
3100 has_on_source_error, on_source_error,
3101 has_on_target_error, on_target_error,
3102 true, true, filter_node_name,
3103 has_copy_mode, copy_mode,
3104 has_auto_finalize, auto_finalize,
3105 has_auto_dismiss, auto_dismiss,
3106 errp);
3107 }
3108
3109 /*
3110 * Get a block job using its ID. Called with job_mutex held.
3111 */
3112 static BlockJob *find_block_job_locked(const char *id, Error **errp)
3113 {
3114 BlockJob *job;
3115
3116 assert(id != NULL);
3117
3118 job = block_job_get_locked(id);
3119
3120 if (!job) {
3121 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3122 "Block job '%s' not found", id);
3123 return NULL;
3124 }
3125
3126 return job;
3127 }
3128
3129 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3130 {
3131 BlockJob *job;
3132
3133 JOB_LOCK_GUARD();
3134 job = find_block_job_locked(device, errp);
3135
3136 if (!job) {
3137 return;
3138 }
3139
3140 block_job_set_speed_locked(job, speed, errp);
3141 }
3142
3143 void qmp_block_job_cancel(const char *device,
3144 bool has_force, bool force, Error **errp)
3145 {
3146 BlockJob *job;
3147
3148 JOB_LOCK_GUARD();
3149 job = find_block_job_locked(device, errp);
3150
3151 if (!job) {
3152 return;
3153 }
3154
3155 if (!has_force) {
3156 force = false;
3157 }
3158
3159 if (job_user_paused_locked(&job->job) && !force) {
3160 error_setg(errp, "The block job for device '%s' is currently paused",
3161 device);
3162 return;
3163 }
3164
3165 trace_qmp_block_job_cancel(job);
3166 job_user_cancel_locked(&job->job, force, errp);
3167 }
3168
3169 void qmp_block_job_pause(const char *device, Error **errp)
3170 {
3171 BlockJob *job;
3172
3173 JOB_LOCK_GUARD();
3174 job = find_block_job_locked(device, errp);
3175
3176 if (!job) {
3177 return;
3178 }
3179
3180 trace_qmp_block_job_pause(job);
3181 job_user_pause_locked(&job->job, errp);
3182 }
3183
3184 void qmp_block_job_resume(const char *device, Error **errp)
3185 {
3186 BlockJob *job;
3187
3188 JOB_LOCK_GUARD();
3189 job = find_block_job_locked(device, errp);
3190
3191 if (!job) {
3192 return;
3193 }
3194
3195 trace_qmp_block_job_resume(job);
3196 job_user_resume_locked(&job->job, errp);
3197 }
3198
3199 void qmp_block_job_complete(const char *device, Error **errp)
3200 {
3201 BlockJob *job;
3202
3203 JOB_LOCK_GUARD();
3204 job = find_block_job_locked(device, errp);
3205
3206 if (!job) {
3207 return;
3208 }
3209
3210 trace_qmp_block_job_complete(job);
3211 job_complete_locked(&job->job, errp);
3212 }
3213
3214 void qmp_block_job_finalize(const char *id, Error **errp)
3215 {
3216 BlockJob *job;
3217
3218 JOB_LOCK_GUARD();
3219 job = find_block_job_locked(id, errp);
3220
3221 if (!job) {
3222 return;
3223 }
3224
3225 trace_qmp_block_job_finalize(job);
3226 job_ref_locked(&job->job);
3227 job_finalize_locked(&job->job, errp);
3228
3229 job_unref_locked(&job->job);
3230 }
3231
3232 void qmp_block_job_dismiss(const char *id, Error **errp)
3233 {
3234 BlockJob *bjob;
3235 Job *job;
3236
3237 JOB_LOCK_GUARD();
3238 bjob = find_block_job_locked(id, errp);
3239
3240 if (!bjob) {
3241 return;
3242 }
3243
3244 trace_qmp_block_job_dismiss(bjob);
3245 job = &bjob->job;
3246 job_dismiss_locked(&job, errp);
3247 }
3248
3249 void qmp_block_job_change(BlockJobChangeOptions *opts, Error **errp)
3250 {
3251 BlockJob *job;
3252
3253 JOB_LOCK_GUARD();
3254 job = find_block_job_locked(opts->id, errp);
3255
3256 if (!job) {
3257 return;
3258 }
3259
3260 block_job_change_locked(job, opts, errp);
3261 }
3262
3263 void qmp_change_backing_file(const char *device,
3264 const char *image_node_name,
3265 const char *backing_file,
3266 Error **errp)
3267 {
3268 BlockDriverState *bs = NULL;
3269 BlockDriverState *image_bs = NULL;
3270 Error *local_err = NULL;
3271 bool ro;
3272 int ret;
3273
3274 bs = qmp_get_root_bs(device, errp);
3275 if (!bs) {
3276 return;
3277 }
3278
3279 bdrv_graph_rdlock_main_loop();
3280
3281 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3282 if (local_err) {
3283 error_propagate(errp, local_err);
3284 goto out_rdlock;
3285 }
3286
3287 if (!image_bs) {
3288 error_setg(errp, "image file not found");
3289 goto out_rdlock;
3290 }
3291
3292 if (bdrv_find_base(image_bs) == image_bs) {
3293 error_setg(errp, "not allowing backing file change on an image "
3294 "without a backing file");
3295 goto out_rdlock;
3296 }
3297
3298 /* even though we are not necessarily operating on bs, we need it to
3299 * determine if block ops are currently prohibited on the chain */
3300 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3301 goto out_rdlock;
3302 }
3303
3304 /* final sanity check */
3305 if (!bdrv_chain_contains(bs, image_bs)) {
3306 error_setg(errp, "'%s' and image file are not in the same chain",
3307 device);
3308 goto out_rdlock;
3309 }
3310 bdrv_graph_rdunlock_main_loop();
3311
3312 /* if not r/w, reopen to make r/w */
3313 ro = bdrv_is_read_only(image_bs);
3314
3315 if (ro) {
3316 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) {
3317 return;
3318 }
3319 }
3320
3321 ret = bdrv_change_backing_file(image_bs, backing_file,
3322 image_bs->drv ? image_bs->drv->format_name : "",
3323 false);
3324
3325 if (ret < 0) {
3326 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3327 backing_file);
3328 /* don't exit here, so we can try to restore open flags if
3329 * appropriate */
3330 }
3331
3332 if (ro) {
3333 bdrv_reopen_set_read_only(image_bs, true, errp);
3334 }
3335 return;
3336
3337 out_rdlock:
3338 bdrv_graph_rdunlock_main_loop();
3339 }
3340
3341 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3342 {
3343 BlockDriverState *bs;
3344 QObject *obj;
3345 Visitor *v = qobject_output_visitor_new(&obj);
3346 QDict *qdict;
3347
3348 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3349 visit_complete(v, &obj);
3350 qdict = qobject_to(QDict, obj);
3351
3352 qdict_flatten(qdict);
3353
3354 if (!qdict_get_try_str(qdict, "node-name")) {
3355 error_setg(errp, "'node-name' must be specified for the root node");
3356 goto fail;
3357 }
3358
3359 bs = bds_tree_init(qdict, errp);
3360 if (!bs) {
3361 goto fail;
3362 }
3363
3364 bdrv_set_monitor_owned(bs);
3365
3366 fail:
3367 visit_free(v);
3368 }
3369
3370 void qmp_blockdev_reopen(BlockdevOptionsList *reopen_list, Error **errp)
3371 {
3372 BlockReopenQueue *queue = NULL;
3373
3374 /* Add each one of the BDS that we want to reopen to the queue */
3375 for (; reopen_list != NULL; reopen_list = reopen_list->next) {
3376 BlockdevOptions *options = reopen_list->value;
3377 BlockDriverState *bs;
3378 QObject *obj;
3379 Visitor *v;
3380 QDict *qdict;
3381
3382 /* Check for the selected node name */
3383 if (!options->node_name) {
3384 error_setg(errp, "node-name not specified");
3385 goto fail;
3386 }
3387
3388 bs = bdrv_find_node(options->node_name);
3389 if (!bs) {
3390 error_setg(errp, "Failed to find node with node-name='%s'",
3391 options->node_name);
3392 goto fail;
3393 }
3394
3395 /* Put all options in a QDict and flatten it */
3396 v = qobject_output_visitor_new(&obj);
3397 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3398 visit_complete(v, &obj);
3399 visit_free(v);
3400
3401 qdict = qobject_to(QDict, obj);
3402
3403 qdict_flatten(qdict);
3404
3405 queue = bdrv_reopen_queue(queue, bs, qdict, false);
3406 }
3407
3408 /* Perform the reopen operation */
3409 bdrv_reopen_multiple(queue, errp);
3410 queue = NULL;
3411
3412 fail:
3413 bdrv_reopen_queue_free(queue);
3414 }
3415
3416 void qmp_blockdev_del(const char *node_name, Error **errp)
3417 {
3418 BlockDriverState *bs;
3419
3420 GLOBAL_STATE_CODE();
3421 GRAPH_RDLOCK_GUARD_MAINLOOP();
3422
3423 bs = bdrv_find_node(node_name);
3424 if (!bs) {
3425 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3426 return;
3427 }
3428 if (bdrv_has_blk(bs)) {
3429 error_setg(errp, "Node %s is in use", node_name);
3430 return;
3431 }
3432
3433 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3434 return;
3435 }
3436
3437 if (!QTAILQ_IN_USE(bs, monitor_list)) {
3438 error_setg(errp, "Node %s is not owned by the monitor",
3439 bs->node_name);
3440 return;
3441 }
3442
3443 if (bs->refcnt > 1) {
3444 error_setg(errp, "Block device %s is in use",
3445 bdrv_get_device_or_node_name(bs));
3446 return;
3447 }
3448
3449 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3450 bdrv_unref(bs);
3451 }
3452
3453 static BdrvChild * GRAPH_RDLOCK
3454 bdrv_find_child(BlockDriverState *parent_bs, const char *child_name)
3455 {
3456 BdrvChild *child;
3457
3458 QLIST_FOREACH(child, &parent_bs->children, next) {
3459 if (strcmp(child->name, child_name) == 0) {
3460 return child;
3461 }
3462 }
3463
3464 return NULL;
3465 }
3466
3467 void qmp_x_blockdev_change(const char *parent, const char *child,
3468 const char *node, Error **errp)
3469 {
3470 BlockDriverState *parent_bs, *new_bs = NULL;
3471 BdrvChild *p_child;
3472
3473 bdrv_graph_wrlock();
3474
3475 parent_bs = bdrv_lookup_bs(parent, parent, errp);
3476 if (!parent_bs) {
3477 goto out;
3478 }
3479
3480 if (!child == !node) {
3481 if (child) {
3482 error_setg(errp, "The parameters child and node are in conflict");
3483 } else {
3484 error_setg(errp, "Either child or node must be specified");
3485 }
3486 goto out;
3487 }
3488
3489 if (child) {
3490 p_child = bdrv_find_child(parent_bs, child);
3491 if (!p_child) {
3492 error_setg(errp, "Node '%s' does not have child '%s'",
3493 parent, child);
3494 goto out;
3495 }
3496 bdrv_del_child(parent_bs, p_child, errp);
3497 }
3498
3499 if (node) {
3500 new_bs = bdrv_find_node(node);
3501 if (!new_bs) {
3502 error_setg(errp, "Node '%s' not found", node);
3503 goto out;
3504 }
3505 bdrv_add_child(parent_bs, new_bs, errp);
3506 }
3507
3508 out:
3509 bdrv_graph_wrunlock();
3510 }
3511
3512 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3513 {
3514 BlockJobInfoList *head = NULL, **tail = &head;
3515 BlockJob *job;
3516
3517 JOB_LOCK_GUARD();
3518
3519 for (job = block_job_next_locked(NULL); job;
3520 job = block_job_next_locked(job)) {
3521 BlockJobInfo *value;
3522
3523 if (block_job_is_internal(job)) {
3524 continue;
3525 }
3526 value = block_job_query_locked(job, errp);
3527 if (!value) {
3528 qapi_free_BlockJobInfoList(head);
3529 return NULL;
3530 }
3531 QAPI_LIST_APPEND(tail, value);
3532 }
3533
3534 return head;
3535 }
3536
3537 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
3538 bool has_force, bool force, Error **errp)
3539 {
3540 AioContext *new_context;
3541 BlockDriverState *bs;
3542
3543 GRAPH_RDLOCK_GUARD_MAINLOOP();
3544
3545 bs = bdrv_find_node(node_name);
3546 if (!bs) {
3547 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3548 return;
3549 }
3550
3551 /* Protects against accidents. */
3552 if (!(has_force && force) && bdrv_has_blk(bs)) {
3553 error_setg(errp, "Node %s is associated with a BlockBackend and could "
3554 "be in use (use force=true to override this check)",
3555 node_name);
3556 return;
3557 }
3558
3559 if (iothread->type == QTYPE_QSTRING) {
3560 IOThread *obj = iothread_by_id(iothread->u.s);
3561 if (!obj) {
3562 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
3563 return;
3564 }
3565
3566 new_context = iothread_get_aio_context(obj);
3567 } else {
3568 new_context = qemu_get_aio_context();
3569 }
3570
3571 bdrv_try_change_aio_context(bs, new_context, NULL, errp);
3572 }
3573
3574 QemuOptsList qemu_common_drive_opts = {
3575 .name = "drive",
3576 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3577 .desc = {
3578 {
3579 .name = "snapshot",
3580 .type = QEMU_OPT_BOOL,
3581 .help = "enable/disable snapshot mode",
3582 },{
3583 .name = "aio",
3584 .type = QEMU_OPT_STRING,
3585 .help = "host AIO implementation (threads, native, io_uring)",
3586 },{
3587 .name = BDRV_OPT_CACHE_WB,
3588 .type = QEMU_OPT_BOOL,
3589 .help = "Enable writeback mode",
3590 },{
3591 .name = "format",
3592 .type = QEMU_OPT_STRING,
3593 .help = "disk format (raw, qcow2, ...)",
3594 },{
3595 .name = "rerror",
3596 .type = QEMU_OPT_STRING,
3597 .help = "read error action",
3598 },{
3599 .name = "werror",
3600 .type = QEMU_OPT_STRING,
3601 .help = "write error action",
3602 },{
3603 .name = BDRV_OPT_READ_ONLY,
3604 .type = QEMU_OPT_BOOL,
3605 .help = "open drive file as read-only",
3606 },
3607
3608 THROTTLE_OPTS,
3609
3610 {
3611 .name = "throttling.group",
3612 .type = QEMU_OPT_STRING,
3613 .help = "name of the block throttling group",
3614 },{
3615 .name = "copy-on-read",
3616 .type = QEMU_OPT_BOOL,
3617 .help = "copy read data from backing file into image file",
3618 },{
3619 .name = "detect-zeroes",
3620 .type = QEMU_OPT_STRING,
3621 .help = "try to optimize zero writes (off, on, unmap)",
3622 },{
3623 .name = "stats-account-invalid",
3624 .type = QEMU_OPT_BOOL,
3625 .help = "whether to account for invalid I/O operations "
3626 "in the statistics",
3627 },{
3628 .name = "stats-account-failed",
3629 .type = QEMU_OPT_BOOL,
3630 .help = "whether to account for failed I/O operations "
3631 "in the statistics",
3632 },
3633 { /* end of list */ }
3634 },
3635 };
3636
3637 QemuOptsList qemu_drive_opts = {
3638 .name = "drive",
3639 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3640 .desc = {
3641 /*
3642 * no elements => accept any params
3643 * validation will happen later
3644 */
3645 { /* end of list */ }
3646 },
3647 };
armbru's QEMU hackery