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range: Introduce range_get_last_bit()
[qemu/armbru.git] / blockdev.c
blob835064ed039b01054129bc6550425404e2666147
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, "Device '%s' 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 ret = bdrv_flush(state->old_bs);
1410 if (ret < 0) {
1411 error_setg_errno(errp, -ret, "Write to node '%s' failed",
1412 bdrv_get_device_or_node_name(state->old_bs));
1413 return;
1414 }
1415 }
1416
1417 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1418 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1419 const char *format = s->format ?: "qcow2";
1420 enum NewImageMode mode;
1421 const char *snapshot_node_name = s->snapshot_node_name;
1422
1423 if (node_name && !snapshot_node_name) {
1424 error_setg(errp, "New overlay node-name missing");
1425 return;
1426 }
1427
1428 if (snapshot_node_name &&
1429 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1430 error_setg(errp, "New overlay node-name already in use");
1431 return;
1432 }
1433
1434 flags = state->old_bs->open_flags;
1435 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1436 flags |= BDRV_O_NO_BACKING;
1437
1438 /* create new image w/backing file */
1439 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1440 if (mode != NEW_IMAGE_MODE_EXISTING) {
1441 int64_t size = bdrv_getlength(state->old_bs);
1442 if (size < 0) {
1443 error_setg_errno(errp, -size, "bdrv_getlength failed");
1444 return;
1445 }
1446 bdrv_refresh_filename(state->old_bs);
1447
1448 bdrv_img_create(new_image_file, format,
1449 state->old_bs->filename,
1450 state->old_bs->drv->format_name,
1451 NULL, size, flags, false, &local_err);
1452
1453 if (local_err) {
1454 error_propagate(errp, local_err);
1455 return;
1456 }
1457 }
1458
1459 options = qdict_new();
1460 if (snapshot_node_name) {
1461 qdict_put_str(options, "node-name", snapshot_node_name);
1462 }
1463 qdict_put_str(options, "driver", format);
1464 }
1465
1466 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1467 errp);
1468
1469 /* We will manually add the backing_hd field to the bs later */
1470 if (!state->new_bs) {
1471 return;
1472 }
1473
1474 /*
1475 * Allow attaching a backing file to an overlay that's already in use only
1476 * if the parents don't assume that they are already seeing a valid image.
1477 * (Specifically, allow it as a mirror target, which is write-only access.)
1478 */
1479 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared);
1480 if (perm & BLK_PERM_CONSISTENT_READ) {
1481 error_setg(errp, "The overlay is already in use");
1482 return;
1483 }
1484
1485 if (state->new_bs->drv->is_filter) {
1486 error_setg(errp, "Filters cannot be used as overlays");
1487 return;
1488 }
1489
1490 if (bdrv_cow_child(state->new_bs)) {
1491 error_setg(errp, "The overlay already has a backing image");
1492 return;
1493 }
1494
1495 if (!state->new_bs->drv->supports_backing) {
1496 error_setg(errp, "The overlay does not support backing images");
1497 return;
1498 }
1499
1500 ret = bdrv_append(state->new_bs, state->old_bs, errp);
1501 if (ret < 0) {
1502 return;
1503 }
1504 state->overlay_appended = true;
1505 }
1506
1507 static void external_snapshot_commit(void *opaque)
1508 {
1509 ExternalSnapshotState *state = opaque;
1510
1511 /* We don't need (or want) to use the transactional
1512 * bdrv_reopen_multiple() across all the entries at once, because we
1513 * don't want to abort all of them if one of them fails the reopen */
1514 if (!qatomic_read(&state->old_bs->copy_on_read)) {
1515 bdrv_reopen_set_read_only(state->old_bs, true, NULL);
1516 }
1517 }
1518
1519 static void external_snapshot_abort(void *opaque)
1520 {
1521 ExternalSnapshotState *state = opaque;
1522 if (state->new_bs) {
1523 if (state->overlay_appended) {
1524 AioContext *aio_context;
1525 AioContext *tmp_context;
1526 int ret;
1527
1528 aio_context = bdrv_get_aio_context(state->old_bs);
1529
1530 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1531 close state->old_bs; we need it */
1532 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1533
1534 /*
1535 * The call to bdrv_set_backing_hd() above returns state->old_bs to
1536 * the main AioContext. As we're still going to be using it, return
1537 * it to the AioContext it was before.
1538 */
1539 tmp_context = bdrv_get_aio_context(state->old_bs);
1540 if (aio_context != tmp_context) {
1541 ret = bdrv_try_change_aio_context(state->old_bs,
1542 aio_context, NULL, NULL);
1543 assert(ret == 0);
1544 }
1545
1546 bdrv_drained_begin(state->new_bs);
1547 bdrv_graph_wrlock();
1548 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1549 bdrv_graph_wrunlock();
1550 bdrv_drained_end(state->new_bs);
1551
1552 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1553 }
1554 }
1555 }
1556
1557 static void external_snapshot_clean(void *opaque)
1558 {
1559 g_autofree ExternalSnapshotState *state = opaque;
1560
1561 if (!state->old_bs) {
1562 return;
1563 }
1564
1565 bdrv_drained_end(state->old_bs);
1566 bdrv_unref(state->new_bs);
1567 }
1568
1569 typedef struct DriveBackupState {
1570 BlockDriverState *bs;
1571 BlockJob *job;
1572 } DriveBackupState;
1573
1574 static BlockJob *do_backup_common(BackupCommon *backup,
1575 BlockDriverState *bs,
1576 BlockDriverState *target_bs,
1577 AioContext *aio_context,
1578 JobTxn *txn, Error **errp);
1579
1580 static void drive_backup_commit(void *opaque);
1581 static void drive_backup_abort(void *opaque);
1582 static void drive_backup_clean(void *opaque);
1583 TransactionActionDrv drive_backup_drv = {
1584 .commit = drive_backup_commit,
1585 .abort = drive_backup_abort,
1586 .clean = drive_backup_clean,
1587 };
1588
1589 static void drive_backup_action(DriveBackup *backup,
1590 JobTxn *block_job_txn,
1591 Transaction *tran, Error **errp)
1592 {
1593 DriveBackupState *state = g_new0(DriveBackupState, 1);
1594 BlockDriverState *bs;
1595 BlockDriverState *target_bs;
1596 BlockDriverState *source = NULL;
1597 AioContext *aio_context;
1598 const char *format;
1599 QDict *options;
1600 Error *local_err = NULL;
1601 int flags;
1602 int64_t size;
1603 bool set_backing_hd = false;
1604 int ret;
1605
1606 GLOBAL_STATE_CODE();
1607
1608 tran_add(tran, &drive_backup_drv, state);
1609
1610 if (!backup->has_mode) {
1611 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1612 }
1613
1614 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1615 if (!bs) {
1616 return;
1617 }
1618
1619 if (!bs->drv) {
1620 error_setg(errp, "Device has no medium");
1621 return;
1622 }
1623
1624 aio_context = bdrv_get_aio_context(bs);
1625
1626 state->bs = bs;
1627 /* Paired with .clean() */
1628 bdrv_drained_begin(bs);
1629
1630 format = backup->format;
1631 if (!format && backup->mode != NEW_IMAGE_MODE_EXISTING) {
1632 format = bs->drv->format_name;
1633 }
1634
1635 /* Early check to avoid creating target */
1636 bdrv_graph_rdlock_main_loop();
1637 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
1638 bdrv_graph_rdunlock_main_loop();
1639 return;
1640 }
1641
1642 flags = bs->open_flags | BDRV_O_RDWR;
1643
1644 /*
1645 * See if we have a backing HD we can use to create our new image
1646 * on top of.
1647 */
1648 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
1649 /*
1650 * Backup will not replace the source by the target, so none
1651 * of the filters skipped here will be removed (in contrast to
1652 * mirror). Therefore, we can skip all of them when looking
1653 * for the first COW relationship.
1654 */
1655 source = bdrv_cow_bs(bdrv_skip_filters(bs));
1656 if (!source) {
1657 backup->sync = MIRROR_SYNC_MODE_FULL;
1658 }
1659 }
1660 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
1661 source = bs;
1662 flags |= BDRV_O_NO_BACKING;
1663 set_backing_hd = true;
1664 }
1665 bdrv_graph_rdunlock_main_loop();
1666
1667 size = bdrv_getlength(bs);
1668 if (size < 0) {
1669 error_setg_errno(errp, -size, "bdrv_getlength failed");
1670 return;
1671 }
1672
1673 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
1674 assert(format);
1675 if (source) {
1676 /* Implicit filters should not appear in the filename */
1677 BlockDriverState *explicit_backing;
1678
1679 bdrv_graph_rdlock_main_loop();
1680 explicit_backing = bdrv_skip_implicit_filters(source);
1681 bdrv_refresh_filename(explicit_backing);
1682 bdrv_graph_rdunlock_main_loop();
1683
1684 bdrv_img_create(backup->target, format,
1685 explicit_backing->filename,
1686 explicit_backing->drv->format_name, NULL,
1687 size, flags, false, &local_err);
1688 } else {
1689 bdrv_img_create(backup->target, format, NULL, NULL, NULL,
1690 size, flags, false, &local_err);
1691 }
1692 }
1693
1694 if (local_err) {
1695 error_propagate(errp, local_err);
1696 return;
1697 }
1698
1699 options = qdict_new();
1700 qdict_put_str(options, "discard", "unmap");
1701 qdict_put_str(options, "detect-zeroes", "unmap");
1702 if (format) {
1703 qdict_put_str(options, "driver", format);
1704 }
1705
1706 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
1707 if (!target_bs) {
1708 return;
1709 }
1710
1711 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
1712 if (ret < 0) {
1713 bdrv_unref(target_bs);
1714 return;
1715 }
1716
1717 if (set_backing_hd) {
1718 if (bdrv_set_backing_hd(target_bs, source, errp) < 0) {
1719 goto unref;
1720 }
1721 }
1722
1723 state->job = do_backup_common(qapi_DriveBackup_base(backup),
1724 bs, target_bs, aio_context,
1725 block_job_txn, errp);
1726
1727 unref:
1728 bdrv_unref(target_bs);
1729 }
1730
1731 static void drive_backup_commit(void *opaque)
1732 {
1733 DriveBackupState *state = opaque;
1734
1735 assert(state->job);
1736 job_start(&state->job->job);
1737 }
1738
1739 static void drive_backup_abort(void *opaque)
1740 {
1741 DriveBackupState *state = opaque;
1742
1743 if (state->job) {
1744 job_cancel_sync(&state->job->job, true);
1745 }
1746 }
1747
1748 static void drive_backup_clean(void *opaque)
1749 {
1750 g_autofree DriveBackupState *state = opaque;
1751
1752 if (!state->bs) {
1753 return;
1754 }
1755
1756 bdrv_drained_end(state->bs);
1757 }
1758
1759 typedef struct BlockdevBackupState {
1760 BlockDriverState *bs;
1761 BlockJob *job;
1762 } BlockdevBackupState;
1763
1764 static void blockdev_backup_commit(void *opaque);
1765 static void blockdev_backup_abort(void *opaque);
1766 static void blockdev_backup_clean(void *opaque);
1767 TransactionActionDrv blockdev_backup_drv = {
1768 .commit = blockdev_backup_commit,
1769 .abort = blockdev_backup_abort,
1770 .clean = blockdev_backup_clean,
1771 };
1772
1773 static void blockdev_backup_action(BlockdevBackup *backup,
1774 JobTxn *block_job_txn,
1775 Transaction *tran, Error **errp)
1776 {
1777 BlockdevBackupState *state = g_new0(BlockdevBackupState, 1);
1778 BlockDriverState *bs;
1779 BlockDriverState *target_bs;
1780 AioContext *aio_context;
1781 int ret;
1782
1783 tran_add(tran, &blockdev_backup_drv, state);
1784
1785 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1786 if (!bs) {
1787 return;
1788 }
1789
1790 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
1791 if (!target_bs) {
1792 return;
1793 }
1794
1795 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */
1796 aio_context = bdrv_get_aio_context(bs);
1797
1798 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
1799 if (ret < 0) {
1800 return;
1801 }
1802
1803 state->bs = bs;
1804
1805 /* Paired with .clean() */
1806 bdrv_drained_begin(state->bs);
1807
1808 state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
1809 bs, target_bs, aio_context,
1810 block_job_txn, errp);
1811 }
1812
1813 static void blockdev_backup_commit(void *opaque)
1814 {
1815 BlockdevBackupState *state = opaque;
1816
1817 assert(state->job);
1818 job_start(&state->job->job);
1819 }
1820
1821 static void blockdev_backup_abort(void *opaque)
1822 {
1823 BlockdevBackupState *state = opaque;
1824
1825 if (state->job) {
1826 job_cancel_sync(&state->job->job, true);
1827 }
1828 }
1829
1830 static void blockdev_backup_clean(void *opaque)
1831 {
1832 g_autofree BlockdevBackupState *state = opaque;
1833
1834 if (!state->bs) {
1835 return;
1836 }
1837
1838 bdrv_drained_end(state->bs);
1839 }
1840
1841 typedef struct BlockDirtyBitmapState {
1842 BdrvDirtyBitmap *bitmap;
1843 BlockDriverState *bs;
1844 HBitmap *backup;
1845 bool was_enabled;
1846 } BlockDirtyBitmapState;
1847
1848 static void block_dirty_bitmap_add_abort(void *opaque);
1849 TransactionActionDrv block_dirty_bitmap_add_drv = {
1850 .abort = block_dirty_bitmap_add_abort,
1851 .clean = g_free,
1852 };
1853
1854 static void block_dirty_bitmap_add_action(BlockDirtyBitmapAdd *action,
1855 Transaction *tran, Error **errp)
1856 {
1857 Error *local_err = NULL;
1858 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1859
1860 tran_add(tran, &block_dirty_bitmap_add_drv, state);
1861
1862 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1863 qmp_block_dirty_bitmap_add(action->node, action->name,
1864 action->has_granularity, action->granularity,
1865 action->has_persistent, action->persistent,
1866 action->has_disabled, action->disabled,
1867 &local_err);
1868
1869 if (!local_err) {
1870 state->bitmap = block_dirty_bitmap_lookup(action->node, action->name,
1871 NULL, &error_abort);
1872 } else {
1873 error_propagate(errp, local_err);
1874 }
1875 }
1876
1877 static void block_dirty_bitmap_add_abort(void *opaque)
1878 {
1879 BlockDirtyBitmapState *state = opaque;
1880
1881 if (state->bitmap) {
1882 bdrv_release_dirty_bitmap(state->bitmap);
1883 }
1884 }
1885
1886 static void block_dirty_bitmap_restore(void *opaque);
1887 static void block_dirty_bitmap_free_backup(void *opaque);
1888 TransactionActionDrv block_dirty_bitmap_clear_drv = {
1889 .abort = block_dirty_bitmap_restore,
1890 .commit = block_dirty_bitmap_free_backup,
1891 .clean = g_free,
1892 };
1893
1894 static void block_dirty_bitmap_clear_action(BlockDirtyBitmap *action,
1895 Transaction *tran, Error **errp)
1896 {
1897 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1898
1899 tran_add(tran, &block_dirty_bitmap_clear_drv, state);
1900
1901 state->bitmap = block_dirty_bitmap_lookup(action->node,
1902 action->name,
1903 &state->bs,
1904 errp);
1905 if (!state->bitmap) {
1906 return;
1907 }
1908
1909 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
1910 return;
1911 }
1912
1913 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
1914 }
1915
1916 static void block_dirty_bitmap_restore(void *opaque)
1917 {
1918 BlockDirtyBitmapState *state = opaque;
1919
1920 if (state->backup) {
1921 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
1922 }
1923 }
1924
1925 static void block_dirty_bitmap_free_backup(void *opaque)
1926 {
1927 BlockDirtyBitmapState *state = opaque;
1928
1929 hbitmap_free(state->backup);
1930 }
1931
1932 static void block_dirty_bitmap_enable_abort(void *opaque);
1933 TransactionActionDrv block_dirty_bitmap_enable_drv = {
1934 .abort = block_dirty_bitmap_enable_abort,
1935 .clean = g_free,
1936 };
1937
1938 static void block_dirty_bitmap_enable_action(BlockDirtyBitmap *action,
1939 Transaction *tran, Error **errp)
1940 {
1941 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1942
1943 tran_add(tran, &block_dirty_bitmap_enable_drv, state);
1944
1945 state->bitmap = block_dirty_bitmap_lookup(action->node,
1946 action->name,
1947 NULL,
1948 errp);
1949 if (!state->bitmap) {
1950 return;
1951 }
1952
1953 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
1954 return;
1955 }
1956
1957 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
1958 bdrv_enable_dirty_bitmap(state->bitmap);
1959 }
1960
1961 static void block_dirty_bitmap_enable_abort(void *opaque)
1962 {
1963 BlockDirtyBitmapState *state = opaque;
1964
1965 if (!state->was_enabled) {
1966 bdrv_disable_dirty_bitmap(state->bitmap);
1967 }
1968 }
1969
1970 static void block_dirty_bitmap_disable_abort(void *opaque);
1971 TransactionActionDrv block_dirty_bitmap_disable_drv = {
1972 .abort = block_dirty_bitmap_disable_abort,
1973 .clean = g_free,
1974 };
1975
1976 static void block_dirty_bitmap_disable_action(BlockDirtyBitmap *action,
1977 Transaction *tran, Error **errp)
1978 {
1979 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1980
1981 tran_add(tran, &block_dirty_bitmap_disable_drv, state);
1982
1983 state->bitmap = block_dirty_bitmap_lookup(action->node,
1984 action->name,
1985 NULL,
1986 errp);
1987 if (!state->bitmap) {
1988 return;
1989 }
1990
1991 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
1992 return;
1993 }
1994
1995 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
1996 bdrv_disable_dirty_bitmap(state->bitmap);
1997 }
1998
1999 static void block_dirty_bitmap_disable_abort(void *opaque)
2000 {
2001 BlockDirtyBitmapState *state = opaque;
2002
2003 if (state->was_enabled) {
2004 bdrv_enable_dirty_bitmap(state->bitmap);
2005 }
2006 }
2007
2008 TransactionActionDrv block_dirty_bitmap_merge_drv = {
2009 .commit = block_dirty_bitmap_free_backup,
2010 .abort = block_dirty_bitmap_restore,
2011 .clean = g_free,
2012 };
2013
2014 static void block_dirty_bitmap_merge_action(BlockDirtyBitmapMerge *action,
2015 Transaction *tran, Error **errp)
2016 {
2017 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2018
2019 tran_add(tran, &block_dirty_bitmap_merge_drv, state);
2020
2021 state->bitmap = block_dirty_bitmap_merge(action->node, action->target,
2022 action->bitmaps, &state->backup,
2023 errp);
2024 }
2025
2026 static void block_dirty_bitmap_remove_commit(void *opaque);
2027 static void block_dirty_bitmap_remove_abort(void *opaque);
2028 TransactionActionDrv block_dirty_bitmap_remove_drv = {
2029 .commit = block_dirty_bitmap_remove_commit,
2030 .abort = block_dirty_bitmap_remove_abort,
2031 .clean = g_free,
2032 };
2033
2034 static void block_dirty_bitmap_remove_action(BlockDirtyBitmap *action,
2035 Transaction *tran, Error **errp)
2036 {
2037 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2038
2039 tran_add(tran, &block_dirty_bitmap_remove_drv, state);
2040
2041
2042 state->bitmap = block_dirty_bitmap_remove(action->node, action->name,
2043 false, &state->bs, errp);
2044 if (state->bitmap) {
2045 bdrv_dirty_bitmap_skip_store(state->bitmap, true);
2046 bdrv_dirty_bitmap_set_busy(state->bitmap, true);
2047 }
2048 }
2049
2050 static void block_dirty_bitmap_remove_abort(void *opaque)
2051 {
2052 BlockDirtyBitmapState *state = opaque;
2053
2054 if (state->bitmap) {
2055 bdrv_dirty_bitmap_skip_store(state->bitmap, false);
2056 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2057 }
2058 }
2059
2060 static void block_dirty_bitmap_remove_commit(void *opaque)
2061 {
2062 BlockDirtyBitmapState *state = opaque;
2063
2064 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2065 bdrv_release_dirty_bitmap(state->bitmap);
2066 }
2067
2068 static void abort_commit(void *opaque);
2069 TransactionActionDrv abort_drv = {
2070 .commit = abort_commit,
2071 };
2072
2073 static void abort_action(Transaction *tran, Error **errp)
2074 {
2075 tran_add(tran, &abort_drv, NULL);
2076 error_setg(errp, "Transaction aborted using Abort action");
2077 }
2078
2079 static void abort_commit(void *opaque)
2080 {
2081 g_assert_not_reached(); /* this action never succeeds */
2082 }
2083
2084 static void transaction_action(TransactionAction *act, JobTxn *block_job_txn,
2085 Transaction *tran, Error **errp)
2086 {
2087 switch (act->type) {
2088 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
2089 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
2090 external_snapshot_action(act, tran, errp);
2091 return;
2092 case TRANSACTION_ACTION_KIND_DRIVE_BACKUP:
2093 drive_backup_action(act->u.drive_backup.data,
2094 block_job_txn, tran, errp);
2095 return;
2096 case TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP:
2097 blockdev_backup_action(act->u.blockdev_backup.data,
2098 block_job_txn, tran, errp);
2099 return;
2100 case TRANSACTION_ACTION_KIND_ABORT:
2101 abort_action(tran, errp);
2102 return;
2103 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC:
2104 internal_snapshot_action(act->u.blockdev_snapshot_internal_sync.data,
2105 tran, errp);
2106 return;
2107 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD:
2108 block_dirty_bitmap_add_action(act->u.block_dirty_bitmap_add.data,
2109 tran, errp);
2110 return;
2111 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR:
2112 block_dirty_bitmap_clear_action(act->u.block_dirty_bitmap_clear.data,
2113 tran, errp);
2114 return;
2115 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE:
2116 block_dirty_bitmap_enable_action(act->u.block_dirty_bitmap_enable.data,
2117 tran, errp);
2118 return;
2119 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE:
2120 block_dirty_bitmap_disable_action(
2121 act->u.block_dirty_bitmap_disable.data, tran, errp);
2122 return;
2123 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE:
2124 block_dirty_bitmap_merge_action(act->u.block_dirty_bitmap_merge.data,
2125 tran, errp);
2126 return;
2127 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE:
2128 block_dirty_bitmap_remove_action(act->u.block_dirty_bitmap_remove.data,
2129 tran, errp);
2130 return;
2131 /*
2132 * Where are transactions for MIRROR, COMMIT and STREAM?
2133 * Although these blockjobs use transaction callbacks like the backup job,
2134 * these jobs do not necessarily adhere to transaction semantics.
2135 * These jobs may not fully undo all of their actions on abort, nor do they
2136 * necessarily work in transactions with more than one job in them.
2137 */
2138 case TRANSACTION_ACTION_KIND__MAX:
2139 default:
2140 g_assert_not_reached();
2141 };
2142 }
2143
2144
2145 /*
2146 * 'Atomic' group operations. The operations are performed as a set, and if
2147 * any fail then we roll back all operations in the group.
2148 *
2149 * Always run under BQL.
2150 */
2151 void qmp_transaction(TransactionActionList *actions,
2152 struct TransactionProperties *properties,
2153 Error **errp)
2154 {
2155 TransactionActionList *act;
2156 JobTxn *block_job_txn = NULL;
2157 Error *local_err = NULL;
2158 Transaction *tran;
2159 ActionCompletionMode comp_mode =
2160 properties ? properties->completion_mode :
2161 ACTION_COMPLETION_MODE_INDIVIDUAL;
2162
2163 GLOBAL_STATE_CODE();
2164
2165 /* Does this transaction get canceled as a group on failure?
2166 * If not, we don't really need to make a JobTxn.
2167 */
2168 if (comp_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2169 for (act = actions; act; act = act->next) {
2170 TransactionActionKind type = act->value->type;
2171
2172 if (type != TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP &&
2173 type != TRANSACTION_ACTION_KIND_DRIVE_BACKUP)
2174 {
2175 error_setg(errp,
2176 "Action '%s' does not support transaction property "
2177 "completion-mode = %s",
2178 TransactionActionKind_str(type),
2179 ActionCompletionMode_str(comp_mode));
2180 return;
2181 }
2182 }
2183
2184 block_job_txn = job_txn_new();
2185 }
2186
2187 /* drain all i/o before any operations */
2188 bdrv_drain_all();
2189
2190 tran = tran_new();
2191
2192 /* We don't do anything in this loop that commits us to the operations */
2193 for (act = actions; act; act = act->next) {
2194 transaction_action(act->value, block_job_txn, tran, &local_err);
2195 if (local_err) {
2196 error_propagate(errp, local_err);
2197 goto delete_and_fail;
2198 }
2199 }
2200
2201 tran_commit(tran);
2202
2203 /* success */
2204 goto exit;
2205
2206 delete_and_fail:
2207 /* failure, and it is all-or-none; roll back all operations */
2208 tran_abort(tran);
2209 exit:
2210 job_txn_unref(block_job_txn);
2211 }
2212
2213 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2214 const char *name,
2215 Error **errp)
2216 {
2217 BdrvDirtyBitmap *bitmap;
2218 BlockDriverState *bs;
2219 BlockDirtyBitmapSha256 *ret = NULL;
2220 char *sha256;
2221
2222 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2223 if (!bitmap || !bs) {
2224 return NULL;
2225 }
2226
2227 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2228 if (sha256 == NULL) {
2229 return NULL;
2230 }
2231
2232 ret = g_new(BlockDirtyBitmapSha256, 1);
2233 ret->sha256 = sha256;
2234
2235 return ret;
2236 }
2237
2238 void coroutine_fn qmp_block_resize(const char *device, const char *node_name,
2239 int64_t size, Error **errp)
2240 {
2241 Error *local_err = NULL;
2242 BlockBackend *blk;
2243 BlockDriverState *bs;
2244 AioContext *old_ctx;
2245
2246 bs = bdrv_lookup_bs(device, node_name, &local_err);
2247 if (local_err) {
2248 error_propagate(errp, local_err);
2249 return;
2250 }
2251
2252 if (size < 0) {
2253 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2254 return;
2255 }
2256
2257 bdrv_graph_co_rdlock();
2258 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, errp)) {
2259 bdrv_graph_co_rdunlock();
2260 return;
2261 }
2262 bdrv_graph_co_rdunlock();
2263
2264 blk = blk_co_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp);
2265 if (!blk) {
2266 return;
2267 }
2268
2269 bdrv_drained_begin(bs);
2270
2271 old_ctx = bdrv_co_enter(bs);
2272 blk_co_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
2273 bdrv_co_leave(bs, old_ctx);
2274
2275 bdrv_drained_end(bs);
2276 blk_co_unref(blk);
2277 }
2278
2279 void qmp_block_stream(const char *job_id, const char *device,
2280 const char *base,
2281 const char *base_node,
2282 const char *backing_file,
2283 bool has_backing_mask_protocol,
2284 bool backing_mask_protocol,
2285 const char *bottom,
2286 bool has_speed, int64_t speed,
2287 bool has_on_error, BlockdevOnError on_error,
2288 const char *filter_node_name,
2289 bool has_auto_finalize, bool auto_finalize,
2290 bool has_auto_dismiss, bool auto_dismiss,
2291 Error **errp)
2292 {
2293 BlockDriverState *bs, *iter, *iter_end;
2294 BlockDriverState *base_bs = NULL;
2295 BlockDriverState *bottom_bs = NULL;
2296 AioContext *aio_context;
2297 Error *local_err = NULL;
2298 int job_flags = JOB_DEFAULT;
2299
2300 GLOBAL_STATE_CODE();
2301
2302 if (base && base_node) {
2303 error_setg(errp, "'base' and 'base-node' cannot be specified "
2304 "at the same time");
2305 return;
2306 }
2307
2308 if (base && bottom) {
2309 error_setg(errp, "'base' and 'bottom' cannot be specified "
2310 "at the same time");
2311 return;
2312 }
2313
2314 if (bottom && base_node) {
2315 error_setg(errp, "'bottom' and 'base-node' cannot be specified "
2316 "at the same time");
2317 return;
2318 }
2319
2320 if (!has_backing_mask_protocol) {
2321 backing_mask_protocol = false;
2322 }
2323
2324 if (!has_on_error) {
2325 on_error = BLOCKDEV_ON_ERROR_REPORT;
2326 }
2327
2328 bs = bdrv_lookup_bs(device, device, errp);
2329 if (!bs) {
2330 return;
2331 }
2332
2333 aio_context = bdrv_get_aio_context(bs);
2334
2335 bdrv_graph_rdlock_main_loop();
2336 if (base) {
2337 base_bs = bdrv_find_backing_image(bs, base);
2338 if (base_bs == NULL) {
2339 error_setg(errp, "Can't find '%s' in the backing chain", base);
2340 goto out_rdlock;
2341 }
2342 assert(bdrv_get_aio_context(base_bs) == aio_context);
2343 }
2344
2345 if (base_node) {
2346 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2347 if (!base_bs) {
2348 goto out_rdlock;
2349 }
2350 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
2351 error_setg(errp, "Node '%s' is not a backing image of '%s'",
2352 base_node, device);
2353 goto out_rdlock;
2354 }
2355 assert(bdrv_get_aio_context(base_bs) == aio_context);
2356
2357 bdrv_refresh_filename(base_bs);
2358 }
2359
2360 if (bottom) {
2361 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp);
2362 if (!bottom_bs) {
2363 goto out_rdlock;
2364 }
2365 if (!bottom_bs->drv) {
2366 error_setg(errp, "Node '%s' is not open", bottom);
2367 goto out_rdlock;
2368 }
2369 if (bottom_bs->drv->is_filter) {
2370 error_setg(errp, "Node '%s' is a filter, use a non-filter node "
2371 "as 'bottom'", bottom);
2372 goto out_rdlock;
2373 }
2374 if (!bdrv_chain_contains(bs, bottom_bs)) {
2375 error_setg(errp, "Node '%s' is not in a chain starting from '%s'",
2376 bottom, device);
2377 goto out_rdlock;
2378 }
2379 assert(bdrv_get_aio_context(bottom_bs) == aio_context);
2380 }
2381
2382 /*
2383 * Check for op blockers in the whole chain between bs and base (or bottom)
2384 */
2385 iter_end = bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs;
2386 for (iter = bs; iter && iter != iter_end;
2387 iter = bdrv_filter_or_cow_bs(iter))
2388 {
2389 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
2390 goto out_rdlock;
2391 }
2392 }
2393 bdrv_graph_rdunlock_main_loop();
2394
2395 /* if we are streaming the entire chain, the result will have no backing
2396 * file, and specifying one is therefore an error */
2397 if (!base_bs && backing_file) {
2398 error_setg(errp, "backing file specified, but streaming the "
2399 "entire chain");
2400 return;
2401 }
2402
2403 if (has_auto_finalize && !auto_finalize) {
2404 job_flags |= JOB_MANUAL_FINALIZE;
2405 }
2406 if (has_auto_dismiss && !auto_dismiss) {
2407 job_flags |= JOB_MANUAL_DISMISS;
2408 }
2409
2410 stream_start(job_id, bs, base_bs, backing_file,
2411 backing_mask_protocol,
2412 bottom_bs, job_flags, has_speed ? speed : 0, on_error,
2413 filter_node_name, &local_err);
2414 if (local_err) {
2415 error_propagate(errp, local_err);
2416 return;
2417 }
2418
2419 trace_qmp_block_stream(bs);
2420 return;
2421
2422 out_rdlock:
2423 bdrv_graph_rdunlock_main_loop();
2424 }
2425
2426 void qmp_block_commit(const char *job_id, const char *device,
2427 const char *base_node,
2428 const char *base,
2429 const char *top_node,
2430 const char *top,
2431 const char *backing_file,
2432 bool has_backing_mask_protocol,
2433 bool backing_mask_protocol,
2434 bool has_speed, int64_t speed,
2435 bool has_on_error, BlockdevOnError on_error,
2436 const char *filter_node_name,
2437 bool has_auto_finalize, bool auto_finalize,
2438 bool has_auto_dismiss, bool auto_dismiss,
2439 Error **errp)
2440 {
2441 BlockDriverState *bs;
2442 BlockDriverState *iter;
2443 BlockDriverState *base_bs, *top_bs;
2444 AioContext *aio_context;
2445 Error *local_err = NULL;
2446 int job_flags = JOB_DEFAULT;
2447 uint64_t top_perm, top_shared;
2448
2449 /* TODO We'll eventually have to take a writer lock in this function */
2450 GRAPH_RDLOCK_GUARD_MAINLOOP();
2451
2452 if (!has_speed) {
2453 speed = 0;
2454 }
2455 if (!has_on_error) {
2456 on_error = BLOCKDEV_ON_ERROR_REPORT;
2457 }
2458 if (has_auto_finalize && !auto_finalize) {
2459 job_flags |= JOB_MANUAL_FINALIZE;
2460 }
2461 if (has_auto_dismiss && !auto_dismiss) {
2462 job_flags |= JOB_MANUAL_DISMISS;
2463 }
2464 if (!has_backing_mask_protocol) {
2465 backing_mask_protocol = false;
2466 }
2467
2468 /* Important Note:
2469 * libvirt relies on the DeviceNotFound error class in order to probe for
2470 * live commit feature versions; for this to work, we must make sure to
2471 * perform the device lookup before any generic errors that may occur in a
2472 * scenario in which all optional arguments are omitted. */
2473 bs = qmp_get_root_bs(device, &local_err);
2474 if (!bs) {
2475 bs = bdrv_lookup_bs(device, device, NULL);
2476 if (!bs) {
2477 error_free(local_err);
2478 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2479 "Device '%s' not found", device);
2480 } else {
2481 error_propagate(errp, local_err);
2482 }
2483 return;
2484 }
2485
2486 aio_context = bdrv_get_aio_context(bs);
2487
2488 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2489 return;
2490 }
2491
2492 /* default top_bs is the active layer */
2493 top_bs = bs;
2494
2495 if (top_node && top) {
2496 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
2497 return;
2498 } else if (top_node) {
2499 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
2500 if (top_bs == NULL) {
2501 return;
2502 }
2503 if (!bdrv_chain_contains(bs, top_bs)) {
2504 error_setg(errp, "'%s' is not in this backing file chain",
2505 top_node);
2506 return;
2507 }
2508 } else if (top) {
2509 /* This strcmp() is just a shortcut, there is no need to
2510 * refresh @bs's filename. If it mismatches,
2511 * bdrv_find_backing_image() will do the refresh and may still
2512 * return @bs. */
2513 if (strcmp(bs->filename, top) != 0) {
2514 top_bs = bdrv_find_backing_image(bs, top);
2515 }
2516 }
2517
2518 if (top_bs == NULL) {
2519 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2520 return;
2521 }
2522
2523 assert(bdrv_get_aio_context(top_bs) == aio_context);
2524
2525 if (base_node && base) {
2526 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
2527 return;
2528 } else if (base_node) {
2529 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2530 if (base_bs == NULL) {
2531 return;
2532 }
2533 if (!bdrv_chain_contains(top_bs, base_bs)) {
2534 error_setg(errp, "'%s' is not in this backing file chain",
2535 base_node);
2536 return;
2537 }
2538 } else if (base) {
2539 base_bs = bdrv_find_backing_image(top_bs, base);
2540 if (base_bs == NULL) {
2541 error_setg(errp, "Can't find '%s' in the backing chain", base);
2542 return;
2543 }
2544 } else {
2545 base_bs = bdrv_find_base(top_bs);
2546 if (base_bs == NULL) {
2547 error_setg(errp, "There is no backimg image");
2548 return;
2549 }
2550 }
2551
2552 assert(bdrv_get_aio_context(base_bs) == aio_context);
2553
2554 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs);
2555 iter = bdrv_filter_or_cow_bs(iter))
2556 {
2557 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2558 return;
2559 }
2560 }
2561
2562 /* Do not allow attempts to commit an image into itself */
2563 if (top_bs == base_bs) {
2564 error_setg(errp, "cannot commit an image into itself");
2565 return;
2566 }
2567
2568 /*
2569 * Active commit is required if and only if someone has taken a
2570 * WRITE permission on the top node. Historically, we have always
2571 * used active commit for top nodes, so continue that practice
2572 * lest we possibly break clients that rely on this behavior, e.g.
2573 * to later attach this node to a writing parent.
2574 * (Active commit is never really wrong.)
2575 */
2576 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared);
2577 if (top_perm & BLK_PERM_WRITE ||
2578 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs))
2579 {
2580 if (backing_file) {
2581 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) {
2582 error_setg(errp, "'backing-file' specified,"
2583 " but 'top' is the active layer");
2584 } else {
2585 error_setg(errp, "'backing-file' specified, but 'top' has a "
2586 "writer on it");
2587 }
2588 return;
2589 }
2590 if (!job_id) {
2591 /*
2592 * Emulate here what block_job_create() does, because it
2593 * is possible that @bs != @top_bs (the block job should
2594 * be named after @bs, even if @top_bs is the actual
2595 * source)
2596 */
2597 job_id = bdrv_get_device_name(bs);
2598 }
2599 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error,
2600 filter_node_name, NULL, NULL, false, &local_err);
2601 } else {
2602 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
2603 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2604 return;
2605 }
2606 commit_start(job_id, bs, base_bs, top_bs, job_flags,
2607 speed, on_error, backing_file,
2608 backing_mask_protocol,
2609 filter_node_name, &local_err);
2610 }
2611 if (local_err != NULL) {
2612 error_propagate(errp, local_err);
2613 return;
2614 }
2615 }
2616
2617 /* Common QMP interface for drive-backup and blockdev-backup */
2618 static BlockJob *do_backup_common(BackupCommon *backup,
2619 BlockDriverState *bs,
2620 BlockDriverState *target_bs,
2621 AioContext *aio_context,
2622 JobTxn *txn, Error **errp)
2623 {
2624 BlockJob *job = NULL;
2625 BdrvDirtyBitmap *bmap = NULL;
2626 BackupPerf perf = { .max_workers = 64 };
2627 int job_flags = JOB_DEFAULT;
2628
2629 if (!backup->has_speed) {
2630 backup->speed = 0;
2631 }
2632 if (!backup->has_on_source_error) {
2633 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2634 }
2635 if (!backup->has_on_target_error) {
2636 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2637 }
2638 if (!backup->has_auto_finalize) {
2639 backup->auto_finalize = true;
2640 }
2641 if (!backup->has_auto_dismiss) {
2642 backup->auto_dismiss = true;
2643 }
2644 if (!backup->has_compress) {
2645 backup->compress = false;
2646 }
2647
2648 if (backup->x_perf) {
2649 if (backup->x_perf->has_use_copy_range) {
2650 perf.use_copy_range = backup->x_perf->use_copy_range;
2651 }
2652 if (backup->x_perf->has_max_workers) {
2653 perf.max_workers = backup->x_perf->max_workers;
2654 }
2655 if (backup->x_perf->has_max_chunk) {
2656 perf.max_chunk = backup->x_perf->max_chunk;
2657 }
2658 }
2659
2660 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
2661 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
2662 /* done before desugaring 'incremental' to print the right message */
2663 if (!backup->bitmap) {
2664 error_setg(errp, "must provide a valid bitmap name for "
2665 "'%s' sync mode", MirrorSyncMode_str(backup->sync));
2666 return NULL;
2667 }
2668 }
2669
2670 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) {
2671 if (backup->has_bitmap_mode &&
2672 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) {
2673 error_setg(errp, "Bitmap sync mode must be '%s' "
2674 "when using sync mode '%s'",
2675 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS),
2676 MirrorSyncMode_str(backup->sync));
2677 return NULL;
2678 }
2679 backup->has_bitmap_mode = true;
2680 backup->sync = MIRROR_SYNC_MODE_BITMAP;
2681 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS;
2682 }
2683
2684 if (backup->bitmap) {
2685 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
2686 if (!bmap) {
2687 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
2688 return NULL;
2689 }
2690 if (!backup->has_bitmap_mode) {
2691 error_setg(errp, "Bitmap sync mode must be given "
2692 "when providing a bitmap");
2693 return NULL;
2694 }
2695 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2696 return NULL;
2697 }
2698
2699 /* This does not produce a useful bitmap artifact: */
2700 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
2701 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap"
2702 " outputs", MirrorSyncMode_str(backup->sync));
2703 return NULL;
2704 }
2705
2706 /* If the bitmap isn't used for input or output, this is useless: */
2707 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER &&
2708 backup->sync != MIRROR_SYNC_MODE_BITMAP) {
2709 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect"
2710 " when combined with sync mode '%s'",
2711 BitmapSyncMode_str(backup->bitmap_mode),
2712 MirrorSyncMode_str(backup->sync));
2713 return NULL;
2714 }
2715 }
2716
2717 if (!backup->bitmap && backup->has_bitmap_mode) {
2718 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap");
2719 return NULL;
2720 }
2721
2722 if (!backup->auto_finalize) {
2723 job_flags |= JOB_MANUAL_FINALIZE;
2724 }
2725 if (!backup->auto_dismiss) {
2726 job_flags |= JOB_MANUAL_DISMISS;
2727 }
2728
2729 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
2730 backup->sync, bmap, backup->bitmap_mode,
2731 backup->compress, backup->discard_source,
2732 backup->filter_node_name,
2733 &perf,
2734 backup->on_source_error,
2735 backup->on_target_error,
2736 job_flags, NULL, NULL, txn, errp);
2737 return job;
2738 }
2739
2740 void qmp_drive_backup(DriveBackup *backup, Error **errp)
2741 {
2742 TransactionAction action = {
2743 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP,
2744 .u.drive_backup.data = backup,
2745 };
2746 blockdev_do_action(&action, errp);
2747 }
2748
2749 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
2750 bool flat,
2751 Error **errp)
2752 {
2753 bool return_flat = has_flat && flat;
2754
2755 return bdrv_named_nodes_list(return_flat, errp);
2756 }
2757
2758 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
2759 {
2760 GRAPH_RDLOCK_GUARD_MAINLOOP();
2761
2762 return bdrv_get_xdbg_block_graph(errp);
2763 }
2764
2765 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
2766 {
2767 TransactionAction action = {
2768 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
2769 .u.blockdev_backup.data = backup,
2770 };
2771 blockdev_do_action(&action, errp);
2772 }
2773
2774 /* Parameter check and block job starting for drive mirroring.
2775 * Caller should hold @device and @target's aio context (must be the same).
2776 **/
2777 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
2778 BlockDriverState *target,
2779 const char *replaces,
2780 enum MirrorSyncMode sync,
2781 BlockMirrorBackingMode backing_mode,
2782 bool zero_target,
2783 bool has_speed, int64_t speed,
2784 bool has_granularity, uint32_t granularity,
2785 bool has_buf_size, int64_t buf_size,
2786 bool has_on_source_error,
2787 BlockdevOnError on_source_error,
2788 bool has_on_target_error,
2789 BlockdevOnError on_target_error,
2790 bool has_unmap, bool unmap,
2791 const char *filter_node_name,
2792 bool has_copy_mode, MirrorCopyMode copy_mode,
2793 bool has_auto_finalize, bool auto_finalize,
2794 bool has_auto_dismiss, bool auto_dismiss,
2795 Error **errp)
2796 {
2797 BlockDriverState *unfiltered_bs;
2798 int job_flags = JOB_DEFAULT;
2799
2800 GLOBAL_STATE_CODE();
2801 GRAPH_RDLOCK_GUARD_MAINLOOP();
2802
2803 if (!has_speed) {
2804 speed = 0;
2805 }
2806 if (!has_on_source_error) {
2807 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2808 }
2809 if (!has_on_target_error) {
2810 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2811 }
2812 if (!has_granularity) {
2813 granularity = 0;
2814 }
2815 if (!has_buf_size) {
2816 buf_size = 0;
2817 }
2818 if (!has_unmap) {
2819 unmap = true;
2820 }
2821 if (!has_copy_mode) {
2822 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
2823 }
2824 if (has_auto_finalize && !auto_finalize) {
2825 job_flags |= JOB_MANUAL_FINALIZE;
2826 }
2827 if (has_auto_dismiss && !auto_dismiss) {
2828 job_flags |= JOB_MANUAL_DISMISS;
2829 }
2830
2831 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2832 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2833 "a value in range [512B, 64MB]");
2834 return;
2835 }
2836 if (granularity & (granularity - 1)) {
2837 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2838 "a power of 2");
2839 return;
2840 }
2841
2842 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
2843 return;
2844 }
2845 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
2846 return;
2847 }
2848
2849 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) {
2850 sync = MIRROR_SYNC_MODE_FULL;
2851 }
2852
2853 if (!replaces) {
2854 /* We want to mirror from @bs, but keep implicit filters on top */
2855 unfiltered_bs = bdrv_skip_implicit_filters(bs);
2856 if (unfiltered_bs != bs) {
2857 replaces = unfiltered_bs->node_name;
2858 }
2859 }
2860
2861 if (replaces) {
2862 BlockDriverState *to_replace_bs;
2863 int64_t bs_size, replace_size;
2864
2865 bs_size = bdrv_getlength(bs);
2866 if (bs_size < 0) {
2867 error_setg_errno(errp, -bs_size, "Failed to query device's size");
2868 return;
2869 }
2870
2871 to_replace_bs = check_to_replace_node(bs, replaces, errp);
2872 if (!to_replace_bs) {
2873 return;
2874 }
2875
2876 replace_size = bdrv_getlength(to_replace_bs);
2877
2878 if (replace_size < 0) {
2879 error_setg_errno(errp, -replace_size,
2880 "Failed to query the replacement node's size");
2881 return;
2882 }
2883 if (bs_size != replace_size) {
2884 error_setg(errp, "cannot replace image with a mirror image of "
2885 "different size");
2886 return;
2887 }
2888 }
2889
2890 /* pass the node name to replace to mirror start since it's loose coupling
2891 * and will allow to check whether the node still exist at mirror completion
2892 */
2893 mirror_start(job_id, bs, target,
2894 replaces, job_flags,
2895 speed, granularity, buf_size, sync, backing_mode, zero_target,
2896 on_source_error, on_target_error, unmap, filter_node_name,
2897 copy_mode, errp);
2898 }
2899
2900 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
2901 {
2902 BlockDriverState *bs;
2903 BlockDriverState *target_backing_bs, *target_bs;
2904 AioContext *aio_context;
2905 BlockMirrorBackingMode backing_mode;
2906 Error *local_err = NULL;
2907 QDict *options = NULL;
2908 int flags;
2909 int64_t size;
2910 const char *format = arg->format;
2911 bool zero_target;
2912 int ret;
2913
2914 bs = qmp_get_root_bs(arg->device, errp);
2915 if (!bs) {
2916 return;
2917 }
2918
2919 /* Early check to avoid creating target */
2920 bdrv_graph_rdlock_main_loop();
2921 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
2922 bdrv_graph_rdunlock_main_loop();
2923 return;
2924 }
2925
2926 aio_context = bdrv_get_aio_context(bs);
2927
2928 if (!arg->has_mode) {
2929 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2930 }
2931
2932 if (!arg->format) {
2933 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
2934 ? NULL : bs->drv->format_name);
2935 }
2936
2937 flags = bs->open_flags | BDRV_O_RDWR;
2938 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs));
2939 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) {
2940 arg->sync = MIRROR_SYNC_MODE_FULL;
2941 }
2942 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
2943 target_backing_bs = bs;
2944 }
2945 bdrv_graph_rdunlock_main_loop();
2946
2947 size = bdrv_getlength(bs);
2948 if (size < 0) {
2949 error_setg_errno(errp, -size, "bdrv_getlength failed");
2950 return;
2951 }
2952
2953 if (arg->replaces) {
2954 if (!arg->node_name) {
2955 error_setg(errp, "a node-name must be provided when replacing a"
2956 " named node of the graph");
2957 return;
2958 }
2959 }
2960
2961 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
2962 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
2963 } else {
2964 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
2965 }
2966
2967 /* Don't open backing image in create() */
2968 flags |= BDRV_O_NO_BACKING;
2969
2970 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs)
2971 && arg->mode != NEW_IMAGE_MODE_EXISTING)
2972 {
2973 /* create new image w/o backing file */
2974 assert(format);
2975 bdrv_img_create(arg->target, format,
2976 NULL, NULL, NULL, size, flags, false, &local_err);
2977 } else {
2978 BlockDriverState *explicit_backing;
2979
2980 switch (arg->mode) {
2981 case NEW_IMAGE_MODE_EXISTING:
2982 break;
2983 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2984 /*
2985 * Create new image with backing file.
2986 * Implicit filters should not appear in the filename.
2987 */
2988 bdrv_graph_rdlock_main_loop();
2989 explicit_backing = bdrv_skip_implicit_filters(target_backing_bs);
2990 bdrv_refresh_filename(explicit_backing);
2991 bdrv_graph_rdunlock_main_loop();
2992
2993 bdrv_img_create(arg->target, format,
2994 explicit_backing->filename,
2995 explicit_backing->drv->format_name,
2996 NULL, size, flags, false, &local_err);
2997 break;
2998 default:
2999 abort();
3000 }
3001 }
3002
3003 if (local_err) {
3004 error_propagate(errp, local_err);
3005 return;
3006 }
3007
3008 options = qdict_new();
3009 if (arg->node_name) {
3010 qdict_put_str(options, "node-name", arg->node_name);
3011 }
3012 if (format) {
3013 qdict_put_str(options, "driver", format);
3014 }
3015
3016 /* Mirroring takes care of copy-on-write using the source's backing
3017 * file.
3018 */
3019 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3020 if (!target_bs) {
3021 return;
3022 }
3023
3024 bdrv_graph_rdlock_main_loop();
3025 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
3026 (arg->mode == NEW_IMAGE_MODE_EXISTING ||
3027 !bdrv_has_zero_init(target_bs)));
3028 bdrv_graph_rdunlock_main_loop();
3029
3030
3031 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
3032 if (ret < 0) {
3033 bdrv_unref(target_bs);
3034 return;
3035 }
3036
3037 blockdev_mirror_common(arg->job_id, bs, target_bs,
3038 arg->replaces, arg->sync,
3039 backing_mode, zero_target,
3040 arg->has_speed, arg->speed,
3041 arg->has_granularity, arg->granularity,
3042 arg->has_buf_size, arg->buf_size,
3043 arg->has_on_source_error, arg->on_source_error,
3044 arg->has_on_target_error, arg->on_target_error,
3045 arg->has_unmap, arg->unmap,
3046 NULL,
3047 arg->has_copy_mode, arg->copy_mode,
3048 arg->has_auto_finalize, arg->auto_finalize,
3049 arg->has_auto_dismiss, arg->auto_dismiss,
3050 errp);
3051 bdrv_unref(target_bs);
3052 }
3053
3054 void qmp_blockdev_mirror(const char *job_id,
3055 const char *device, const char *target,
3056 const char *replaces,
3057 MirrorSyncMode sync,
3058 bool has_speed, int64_t speed,
3059 bool has_granularity, uint32_t granularity,
3060 bool has_buf_size, int64_t buf_size,
3061 bool has_on_source_error,
3062 BlockdevOnError on_source_error,
3063 bool has_on_target_error,
3064 BlockdevOnError on_target_error,
3065 const char *filter_node_name,
3066 bool has_copy_mode, MirrorCopyMode copy_mode,
3067 bool has_auto_finalize, bool auto_finalize,
3068 bool has_auto_dismiss, bool auto_dismiss,
3069 Error **errp)
3070 {
3071 BlockDriverState *bs;
3072 BlockDriverState *target_bs;
3073 AioContext *aio_context;
3074 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3075 bool zero_target;
3076 int ret;
3077
3078 bs = qmp_get_root_bs(device, errp);
3079 if (!bs) {
3080 return;
3081 }
3082
3083 target_bs = bdrv_lookup_bs(target, target, errp);
3084 if (!target_bs) {
3085 return;
3086 }
3087
3088 zero_target = (sync == MIRROR_SYNC_MODE_FULL);
3089
3090 aio_context = bdrv_get_aio_context(bs);
3091
3092 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
3093 if (ret < 0) {
3094 return;
3095 }
3096
3097 blockdev_mirror_common(job_id, bs, target_bs,
3098 replaces, sync, backing_mode,
3099 zero_target, has_speed, speed,
3100 has_granularity, granularity,
3101 has_buf_size, buf_size,
3102 has_on_source_error, on_source_error,
3103 has_on_target_error, on_target_error,
3104 true, true, filter_node_name,
3105 has_copy_mode, copy_mode,
3106 has_auto_finalize, auto_finalize,
3107 has_auto_dismiss, auto_dismiss,
3108 errp);
3109 }
3110
3111 /*
3112 * Get a block job using its ID. Called with job_mutex held.
3113 */
3114 static BlockJob *find_block_job_locked(const char *id, Error **errp)
3115 {
3116 BlockJob *job;
3117
3118 assert(id != NULL);
3119
3120 job = block_job_get_locked(id);
3121
3122 if (!job) {
3123 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3124 "Block job '%s' not found", id);
3125 return NULL;
3126 }
3127
3128 return job;
3129 }
3130
3131 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3132 {
3133 BlockJob *job;
3134
3135 JOB_LOCK_GUARD();
3136 job = find_block_job_locked(device, errp);
3137
3138 if (!job) {
3139 return;
3140 }
3141
3142 block_job_set_speed_locked(job, speed, errp);
3143 }
3144
3145 void qmp_block_job_cancel(const char *device,
3146 bool has_force, bool force, Error **errp)
3147 {
3148 BlockJob *job;
3149
3150 JOB_LOCK_GUARD();
3151 job = find_block_job_locked(device, errp);
3152
3153 if (!job) {
3154 return;
3155 }
3156
3157 if (!has_force) {
3158 force = false;
3159 }
3160
3161 if (job_user_paused_locked(&job->job) && !force) {
3162 error_setg(errp, "The block job for device '%s' is currently paused",
3163 device);
3164 return;
3165 }
3166
3167 trace_qmp_block_job_cancel(job);
3168 job_user_cancel_locked(&job->job, force, errp);
3169 }
3170
3171 void qmp_block_job_pause(const char *device, Error **errp)
3172 {
3173 BlockJob *job;
3174
3175 JOB_LOCK_GUARD();
3176 job = find_block_job_locked(device, errp);
3177
3178 if (!job) {
3179 return;
3180 }
3181
3182 trace_qmp_block_job_pause(job);
3183 job_user_pause_locked(&job->job, errp);
3184 }
3185
3186 void qmp_block_job_resume(const char *device, Error **errp)
3187 {
3188 BlockJob *job;
3189
3190 JOB_LOCK_GUARD();
3191 job = find_block_job_locked(device, errp);
3192
3193 if (!job) {
3194 return;
3195 }
3196
3197 trace_qmp_block_job_resume(job);
3198 job_user_resume_locked(&job->job, errp);
3199 }
3200
3201 void qmp_block_job_complete(const char *device, Error **errp)
3202 {
3203 BlockJob *job;
3204
3205 JOB_LOCK_GUARD();
3206 job = find_block_job_locked(device, errp);
3207
3208 if (!job) {
3209 return;
3210 }
3211
3212 trace_qmp_block_job_complete(job);
3213 job_complete_locked(&job->job, errp);
3214 }
3215
3216 void qmp_block_job_finalize(const char *id, Error **errp)
3217 {
3218 BlockJob *job;
3219
3220 JOB_LOCK_GUARD();
3221 job = find_block_job_locked(id, errp);
3222
3223 if (!job) {
3224 return;
3225 }
3226
3227 trace_qmp_block_job_finalize(job);
3228 job_ref_locked(&job->job);
3229 job_finalize_locked(&job->job, errp);
3230
3231 job_unref_locked(&job->job);
3232 }
3233
3234 void qmp_block_job_dismiss(const char *id, Error **errp)
3235 {
3236 BlockJob *bjob;
3237 Job *job;
3238
3239 JOB_LOCK_GUARD();
3240 bjob = find_block_job_locked(id, errp);
3241
3242 if (!bjob) {
3243 return;
3244 }
3245
3246 trace_qmp_block_job_dismiss(bjob);
3247 job = &bjob->job;
3248 job_dismiss_locked(&job, errp);
3249 }
3250
3251 void qmp_block_job_change(BlockJobChangeOptions *opts, Error **errp)
3252 {
3253 BlockJob *job;
3254
3255 JOB_LOCK_GUARD();
3256 job = find_block_job_locked(opts->id, errp);
3257
3258 if (!job) {
3259 return;
3260 }
3261
3262 block_job_change_locked(job, opts, errp);
3263 }
3264
3265 void qmp_change_backing_file(const char *device,
3266 const char *image_node_name,
3267 const char *backing_file,
3268 Error **errp)
3269 {
3270 BlockDriverState *bs = NULL;
3271 BlockDriverState *image_bs = NULL;
3272 Error *local_err = NULL;
3273 bool ro;
3274 int ret;
3275
3276 bs = qmp_get_root_bs(device, errp);
3277 if (!bs) {
3278 return;
3279 }
3280
3281 bdrv_graph_rdlock_main_loop();
3282
3283 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3284 if (local_err) {
3285 error_propagate(errp, local_err);
3286 goto out_rdlock;
3287 }
3288
3289 if (!image_bs) {
3290 error_setg(errp, "image file not found");
3291 goto out_rdlock;
3292 }
3293
3294 if (bdrv_find_base(image_bs) == image_bs) {
3295 error_setg(errp, "not allowing backing file change on an image "
3296 "without a backing file");
3297 goto out_rdlock;
3298 }
3299
3300 /* even though we are not necessarily operating on bs, we need it to
3301 * determine if block ops are currently prohibited on the chain */
3302 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3303 goto out_rdlock;
3304 }
3305
3306 /* final sanity check */
3307 if (!bdrv_chain_contains(bs, image_bs)) {
3308 error_setg(errp, "'%s' and image file are not in the same chain",
3309 device);
3310 goto out_rdlock;
3311 }
3312 bdrv_graph_rdunlock_main_loop();
3313
3314 /* if not r/w, reopen to make r/w */
3315 ro = bdrv_is_read_only(image_bs);
3316
3317 if (ro) {
3318 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) {
3319 return;
3320 }
3321 }
3322
3323 ret = bdrv_change_backing_file(image_bs, backing_file,
3324 image_bs->drv ? image_bs->drv->format_name : "",
3325 false);
3326
3327 if (ret < 0) {
3328 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3329 backing_file);
3330 /* don't exit here, so we can try to restore open flags if
3331 * appropriate */
3332 }
3333
3334 if (ro) {
3335 bdrv_reopen_set_read_only(image_bs, true, errp);
3336 }
3337 return;
3338
3339 out_rdlock:
3340 bdrv_graph_rdunlock_main_loop();
3341 }
3342
3343 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3344 {
3345 BlockDriverState *bs;
3346 QObject *obj;
3347 Visitor *v = qobject_output_visitor_new(&obj);
3348 QDict *qdict;
3349
3350 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3351 visit_complete(v, &obj);
3352 qdict = qobject_to(QDict, obj);
3353
3354 qdict_flatten(qdict);
3355
3356 if (!qdict_get_try_str(qdict, "node-name")) {
3357 error_setg(errp, "'node-name' must be specified for the root node");
3358 goto fail;
3359 }
3360
3361 bs = bds_tree_init(qdict, errp);
3362 if (!bs) {
3363 goto fail;
3364 }
3365
3366 bdrv_set_monitor_owned(bs);
3367
3368 fail:
3369 visit_free(v);
3370 }
3371
3372 void qmp_blockdev_reopen(BlockdevOptionsList *reopen_list, Error **errp)
3373 {
3374 BlockReopenQueue *queue = NULL;
3375
3376 /* Add each one of the BDS that we want to reopen to the queue */
3377 for (; reopen_list != NULL; reopen_list = reopen_list->next) {
3378 BlockdevOptions *options = reopen_list->value;
3379 BlockDriverState *bs;
3380 QObject *obj;
3381 Visitor *v;
3382 QDict *qdict;
3383
3384 /* Check for the selected node name */
3385 if (!options->node_name) {
3386 error_setg(errp, "node-name not specified");
3387 goto fail;
3388 }
3389
3390 bs = bdrv_find_node(options->node_name);
3391 if (!bs) {
3392 error_setg(errp, "Failed to find node with node-name='%s'",
3393 options->node_name);
3394 goto fail;
3395 }
3396
3397 /* Put all options in a QDict and flatten it */
3398 v = qobject_output_visitor_new(&obj);
3399 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3400 visit_complete(v, &obj);
3401 visit_free(v);
3402
3403 qdict = qobject_to(QDict, obj);
3404
3405 qdict_flatten(qdict);
3406
3407 queue = bdrv_reopen_queue(queue, bs, qdict, false);
3408 }
3409
3410 /* Perform the reopen operation */
3411 bdrv_reopen_multiple(queue, errp);
3412 queue = NULL;
3413
3414 fail:
3415 bdrv_reopen_queue_free(queue);
3416 }
3417
3418 void qmp_blockdev_del(const char *node_name, Error **errp)
3419 {
3420 BlockDriverState *bs;
3421
3422 GLOBAL_STATE_CODE();
3423 GRAPH_RDLOCK_GUARD_MAINLOOP();
3424
3425 bs = bdrv_find_node(node_name);
3426 if (!bs) {
3427 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3428 return;
3429 }
3430 if (bdrv_has_blk(bs)) {
3431 error_setg(errp, "Node %s is in use", node_name);
3432 return;
3433 }
3434
3435 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3436 return;
3437 }
3438
3439 if (!QTAILQ_IN_USE(bs, monitor_list)) {
3440 error_setg(errp, "Node %s is not owned by the monitor",
3441 bs->node_name);
3442 return;
3443 }
3444
3445 if (bs->refcnt > 1) {
3446 error_setg(errp, "Block device %s is in use",
3447 bdrv_get_device_or_node_name(bs));
3448 return;
3449 }
3450
3451 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3452 bdrv_unref(bs);
3453 }
3454
3455 static BdrvChild * GRAPH_RDLOCK
3456 bdrv_find_child(BlockDriverState *parent_bs, const char *child_name)
3457 {
3458 BdrvChild *child;
3459
3460 QLIST_FOREACH(child, &parent_bs->children, next) {
3461 if (strcmp(child->name, child_name) == 0) {
3462 return child;
3463 }
3464 }
3465
3466 return NULL;
3467 }
3468
3469 void qmp_x_blockdev_change(const char *parent, const char *child,
3470 const char *node, Error **errp)
3471 {
3472 BlockDriverState *parent_bs, *new_bs = NULL;
3473 BdrvChild *p_child;
3474
3475 bdrv_graph_wrlock();
3476
3477 parent_bs = bdrv_lookup_bs(parent, parent, errp);
3478 if (!parent_bs) {
3479 goto out;
3480 }
3481
3482 if (!child == !node) {
3483 if (child) {
3484 error_setg(errp, "The parameters child and node are in conflict");
3485 } else {
3486 error_setg(errp, "Either child or node must be specified");
3487 }
3488 goto out;
3489 }
3490
3491 if (child) {
3492 p_child = bdrv_find_child(parent_bs, child);
3493 if (!p_child) {
3494 error_setg(errp, "Node '%s' does not have child '%s'",
3495 parent, child);
3496 goto out;
3497 }
3498 bdrv_del_child(parent_bs, p_child, errp);
3499 }
3500
3501 if (node) {
3502 new_bs = bdrv_find_node(node);
3503 if (!new_bs) {
3504 error_setg(errp, "Node '%s' not found", node);
3505 goto out;
3506 }
3507 bdrv_add_child(parent_bs, new_bs, errp);
3508 }
3509
3510 out:
3511 bdrv_graph_wrunlock();
3512 }
3513
3514 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3515 {
3516 BlockJobInfoList *head = NULL, **tail = &head;
3517 BlockJob *job;
3518
3519 JOB_LOCK_GUARD();
3520
3521 for (job = block_job_next_locked(NULL); job;
3522 job = block_job_next_locked(job)) {
3523 BlockJobInfo *value;
3524
3525 if (block_job_is_internal(job)) {
3526 continue;
3527 }
3528 value = block_job_query_locked(job, errp);
3529 if (!value) {
3530 qapi_free_BlockJobInfoList(head);
3531 return NULL;
3532 }
3533 QAPI_LIST_APPEND(tail, value);
3534 }
3535
3536 return head;
3537 }
3538
3539 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
3540 bool has_force, bool force, Error **errp)
3541 {
3542 AioContext *new_context;
3543 BlockDriverState *bs;
3544
3545 GRAPH_RDLOCK_GUARD_MAINLOOP();
3546
3547 bs = bdrv_find_node(node_name);
3548 if (!bs) {
3549 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3550 return;
3551 }
3552
3553 /* Protects against accidents. */
3554 if (!(has_force && force) && bdrv_has_blk(bs)) {
3555 error_setg(errp, "Node %s is associated with a BlockBackend and could "
3556 "be in use (use force=true to override this check)",
3557 node_name);
3558 return;
3559 }
3560
3561 if (iothread->type == QTYPE_QSTRING) {
3562 IOThread *obj = iothread_by_id(iothread->u.s);
3563 if (!obj) {
3564 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
3565 return;
3566 }
3567
3568 new_context = iothread_get_aio_context(obj);
3569 } else {
3570 new_context = qemu_get_aio_context();
3571 }
3572
3573 bdrv_try_change_aio_context(bs, new_context, NULL, errp);
3574 }
3575
3576 QemuOptsList qemu_common_drive_opts = {
3577 .name = "drive",
3578 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3579 .desc = {
3580 {
3581 .name = "snapshot",
3582 .type = QEMU_OPT_BOOL,
3583 .help = "enable/disable snapshot mode",
3584 },{
3585 .name = "aio",
3586 .type = QEMU_OPT_STRING,
3587 .help = "host AIO implementation (threads, native, io_uring)",
3588 },{
3589 .name = BDRV_OPT_CACHE_WB,
3590 .type = QEMU_OPT_BOOL,
3591 .help = "Enable writeback mode",
3592 },{
3593 .name = "format",
3594 .type = QEMU_OPT_STRING,
3595 .help = "disk format (raw, qcow2, ...)",
3596 },{
3597 .name = "rerror",
3598 .type = QEMU_OPT_STRING,
3599 .help = "read error action",
3600 },{
3601 .name = "werror",
3602 .type = QEMU_OPT_STRING,
3603 .help = "write error action",
3604 },{
3605 .name = BDRV_OPT_READ_ONLY,
3606 .type = QEMU_OPT_BOOL,
3607 .help = "open drive file as read-only",
3608 },
3609
3610 THROTTLE_OPTS,
3611
3612 {
3613 .name = "throttling.group",
3614 .type = QEMU_OPT_STRING,
3615 .help = "name of the block throttling group",
3616 },{
3617 .name = "copy-on-read",
3618 .type = QEMU_OPT_BOOL,
3619 .help = "copy read data from backing file into image file",
3620 },{
3621 .name = "detect-zeroes",
3622 .type = QEMU_OPT_STRING,
3623 .help = "try to optimize zero writes (off, on, unmap)",
3624 },{
3625 .name = "stats-account-invalid",
3626 .type = QEMU_OPT_BOOL,
3627 .help = "whether to account for invalid I/O operations "
3628 "in the statistics",
3629 },{
3630 .name = "stats-account-failed",
3631 .type = QEMU_OPT_BOOL,
3632 .help = "whether to account for failed I/O operations "
3633 "in the statistics",
3634 },
3635 { /* end of list */ }
3636 },
3637 };
3638
3639 QemuOptsList qemu_drive_opts = {
3640 .name = "drive",
3641 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3642 .desc = {
3643 /*
3644 * no elements => accept any params
3645 * validation will happen later
3646 */
3647 { /* end of list */ }
3648 },
3649 };
armbru's QEMU hackery