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Add NVMM Accelerator: add maintainers for NetBSD/NVMM
[qemu/kevin.git] / blockdev.c
blob834c2304a1c60296c75ef6102c425fb4f5564d02
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "qemu/osdep.h"
34 #include "sysemu/block-backend.h"
35 #include "sysemu/blockdev.h"
36 #include "hw/block/block.h"
37 #include "block/blockjob.h"
38 #include "block/qdict.h"
39 #include "block/throttle-groups.h"
40 #include "monitor/monitor.h"
41 #include "qemu/error-report.h"
42 #include "qemu/option.h"
43 #include "qemu/qemu-print.h"
44 #include "qemu/config-file.h"
45 #include "qapi/qapi-commands-block.h"
46 #include "qapi/qapi-commands-transaction.h"
47 #include "qapi/qapi-visit-block-core.h"
48 #include "qapi/qmp/qdict.h"
49 #include "qapi/qmp/qnum.h"
50 #include "qapi/qmp/qstring.h"
51 #include "qapi/error.h"
52 #include "qapi/qmp/qerror.h"
53 #include "qapi/qmp/qlist.h"
54 #include "qapi/qobject-output-visitor.h"
55 #include "sysemu/sysemu.h"
56 #include "sysemu/iothread.h"
57 #include "block/block_int.h"
58 #include "block/trace.h"
59 #include "sysemu/arch_init.h"
60 #include "sysemu/runstate.h"
61 #include "sysemu/replay.h"
62 #include "qemu/cutils.h"
63 #include "qemu/help_option.h"
64 #include "qemu/main-loop.h"
65 #include "qemu/throttle-options.h"
66
67 QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
68 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
69
70 void bdrv_set_monitor_owned(BlockDriverState *bs)
71 {
72 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
73 }
74
75 static const char *const if_name[IF_COUNT] = {
76 [IF_NONE] = "none",
77 [IF_IDE] = "ide",
78 [IF_SCSI] = "scsi",
79 [IF_FLOPPY] = "floppy",
80 [IF_PFLASH] = "pflash",
81 [IF_MTD] = "mtd",
82 [IF_SD] = "sd",
83 [IF_VIRTIO] = "virtio",
84 [IF_XEN] = "xen",
85 };
86
87 static int if_max_devs[IF_COUNT] = {
88 /*
89 * Do not change these numbers! They govern how drive option
90 * index maps to unit and bus. That mapping is ABI.
91 *
92 * All controllers used to implement if=T drives need to support
93 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
94 * Otherwise, some index values map to "impossible" bus, unit
95 * values.
96 *
97 * For instance, if you change [IF_SCSI] to 255, -drive
98 * if=scsi,index=12 no longer means bus=1,unit=5, but
99 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
100 * the drive can't be set up. Regression.
101 */
102 [IF_IDE] = 2,
103 [IF_SCSI] = 7,
104 };
105
106 /**
107 * Boards may call this to offer board-by-board overrides
108 * of the default, global values.
109 */
110 void override_max_devs(BlockInterfaceType type, int max_devs)
111 {
112 BlockBackend *blk;
113 DriveInfo *dinfo;
114
115 if (max_devs <= 0) {
116 return;
117 }
118
119 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
120 dinfo = blk_legacy_dinfo(blk);
121 if (dinfo->type == type) {
122 fprintf(stderr, "Cannot override units-per-bus property of"
123 " the %s interface, because a drive of that type has"
124 " already been added.\n", if_name[type]);
125 g_assert_not_reached();
126 }
127 }
128
129 if_max_devs[type] = max_devs;
130 }
131
132 /*
133 * We automatically delete the drive when a device using it gets
134 * unplugged. Questionable feature, but we can't just drop it.
135 * Device models call blockdev_mark_auto_del() to schedule the
136 * automatic deletion, and generic qdev code calls blockdev_auto_del()
137 * when deletion is actually safe.
138 */
139 void blockdev_mark_auto_del(BlockBackend *blk)
140 {
141 DriveInfo *dinfo = blk_legacy_dinfo(blk);
142 BlockJob *job;
143
144 if (!dinfo) {
145 return;
146 }
147
148 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
149 if (block_job_has_bdrv(job, blk_bs(blk))) {
150 AioContext *aio_context = job->job.aio_context;
151 aio_context_acquire(aio_context);
152
153 job_cancel(&job->job, false);
154
155 aio_context_release(aio_context);
156 }
157 }
158
159 dinfo->auto_del = 1;
160 }
161
162 void blockdev_auto_del(BlockBackend *blk)
163 {
164 DriveInfo *dinfo = blk_legacy_dinfo(blk);
165
166 if (dinfo && dinfo->auto_del) {
167 monitor_remove_blk(blk);
168 blk_unref(blk);
169 }
170 }
171
172 /**
173 * Returns the current mapping of how many units per bus
174 * a particular interface can support.
175 *
176 * A positive integer indicates n units per bus.
177 * 0 implies the mapping has not been established.
178 * -1 indicates an invalid BlockInterfaceType was given.
179 */
180 int drive_get_max_devs(BlockInterfaceType type)
181 {
182 if (type >= IF_IDE && type < IF_COUNT) {
183 return if_max_devs[type];
184 }
185
186 return -1;
187 }
188
189 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
190 {
191 int max_devs = if_max_devs[type];
192 return max_devs ? index / max_devs : 0;
193 }
194
195 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
196 {
197 int max_devs = if_max_devs[type];
198 return max_devs ? index % max_devs : index;
199 }
200
201 QemuOpts *drive_def(const char *optstr)
202 {
203 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
204 }
205
206 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
207 const char *optstr)
208 {
209 QemuOpts *opts;
210
211 opts = drive_def(optstr);
212 if (!opts) {
213 return NULL;
214 }
215 if (type != IF_DEFAULT) {
216 qemu_opt_set(opts, "if", if_name[type], &error_abort);
217 }
218 if (index >= 0) {
219 qemu_opt_set_number(opts, "index", index, &error_abort);
220 }
221 if (file)
222 qemu_opt_set(opts, "file", file, &error_abort);
223 return opts;
224 }
225
226 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
227 {
228 BlockBackend *blk;
229 DriveInfo *dinfo;
230
231 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
232 dinfo = blk_legacy_dinfo(blk);
233 if (dinfo && dinfo->type == type
234 && dinfo->bus == bus && dinfo->unit == unit) {
235 return dinfo;
236 }
237 }
238
239 return NULL;
240 }
241
242 /*
243 * Check board claimed all -drive that are meant to be claimed.
244 * Fatal error if any remain unclaimed.
245 */
246 void drive_check_orphaned(void)
247 {
248 BlockBackend *blk;
249 DriveInfo *dinfo;
250 Location loc;
251 bool orphans = false;
252
253 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
254 dinfo = blk_legacy_dinfo(blk);
255 /*
256 * Ignore default drives, because we create certain default
257 * drives unconditionally, then leave them unclaimed. Not the
258 * users fault.
259 * Ignore IF_VIRTIO, because it gets desugared into -device,
260 * so we can leave failing to -device.
261 * Ignore IF_NONE, because leaving unclaimed IF_NONE remains
262 * available for device_add is a feature.
263 */
264 if (dinfo->is_default || dinfo->type == IF_VIRTIO
265 || dinfo->type == IF_NONE) {
266 continue;
267 }
268 if (!blk_get_attached_dev(blk)) {
269 loc_push_none(&loc);
270 qemu_opts_loc_restore(dinfo->opts);
271 error_report("machine type does not support"
272 " if=%s,bus=%d,unit=%d",
273 if_name[dinfo->type], dinfo->bus, dinfo->unit);
274 loc_pop(&loc);
275 orphans = true;
276 }
277 }
278
279 if (orphans) {
280 exit(1);
281 }
282 }
283
284 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
285 {
286 return drive_get(type,
287 drive_index_to_bus_id(type, index),
288 drive_index_to_unit_id(type, index));
289 }
290
291 int drive_get_max_bus(BlockInterfaceType type)
292 {
293 int max_bus;
294 BlockBackend *blk;
295 DriveInfo *dinfo;
296
297 max_bus = -1;
298 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
299 dinfo = blk_legacy_dinfo(blk);
300 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
301 max_bus = dinfo->bus;
302 }
303 }
304 return max_bus;
305 }
306
307 /* Get a block device. This should only be used for single-drive devices
308 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
309 appropriate bus. */
310 DriveInfo *drive_get_next(BlockInterfaceType type)
311 {
312 static int next_block_unit[IF_COUNT];
313
314 return drive_get(type, 0, next_block_unit[type]++);
315 }
316
317 static void bdrv_format_print(void *opaque, const char *name)
318 {
319 qemu_printf(" %s", name);
320 }
321
322 typedef struct {
323 QEMUBH *bh;
324 BlockDriverState *bs;
325 } BDRVPutRefBH;
326
327 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
328 {
329 if (!strcmp(buf, "ignore")) {
330 return BLOCKDEV_ON_ERROR_IGNORE;
331 } else if (!is_read && !strcmp(buf, "enospc")) {
332 return BLOCKDEV_ON_ERROR_ENOSPC;
333 } else if (!strcmp(buf, "stop")) {
334 return BLOCKDEV_ON_ERROR_STOP;
335 } else if (!strcmp(buf, "report")) {
336 return BLOCKDEV_ON_ERROR_REPORT;
337 } else {
338 error_setg(errp, "'%s' invalid %s error action",
339 buf, is_read ? "read" : "write");
340 return -1;
341 }
342 }
343
344 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
345 Error **errp)
346 {
347 const QListEntry *entry;
348 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
349 switch (qobject_type(entry->value)) {
350
351 case QTYPE_QSTRING: {
352 unsigned long long length;
353 const char *str = qstring_get_str(qobject_to(QString,
354 entry->value));
355 if (parse_uint_full(str, &length, 10) == 0 &&
356 length > 0 && length <= UINT_MAX) {
357 block_acct_add_interval(stats, (unsigned) length);
358 } else {
359 error_setg(errp, "Invalid interval length: %s", str);
360 return false;
361 }
362 break;
363 }
364
365 case QTYPE_QNUM: {
366 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
367
368 if (length > 0 && length <= UINT_MAX) {
369 block_acct_add_interval(stats, (unsigned) length);
370 } else {
371 error_setg(errp, "Invalid interval length: %" PRId64, length);
372 return false;
373 }
374 break;
375 }
376
377 default:
378 error_setg(errp, "The specification of stats-intervals is invalid");
379 return false;
380 }
381 }
382 return true;
383 }
384
385 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
386
387 /* All parameters but @opts are optional and may be set to NULL. */
388 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
389 const char **throttling_group, ThrottleConfig *throttle_cfg,
390 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
391 {
392 Error *local_error = NULL;
393 const char *aio;
394
395 if (bdrv_flags) {
396 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
397 *bdrv_flags |= BDRV_O_COPY_ON_READ;
398 }
399
400 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
401 if (bdrv_parse_aio(aio, bdrv_flags) < 0) {
402 error_setg(errp, "invalid aio option");
403 return;
404 }
405 }
406 }
407
408 /* disk I/O throttling */
409 if (throttling_group) {
410 *throttling_group = qemu_opt_get(opts, "throttling.group");
411 }
412
413 if (throttle_cfg) {
414 throttle_config_init(throttle_cfg);
415 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
416 qemu_opt_get_number(opts, "throttling.bps-total", 0);
417 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
418 qemu_opt_get_number(opts, "throttling.bps-read", 0);
419 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
420 qemu_opt_get_number(opts, "throttling.bps-write", 0);
421 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
422 qemu_opt_get_number(opts, "throttling.iops-total", 0);
423 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
424 qemu_opt_get_number(opts, "throttling.iops-read", 0);
425 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
426 qemu_opt_get_number(opts, "throttling.iops-write", 0);
427
428 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
429 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
430 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
431 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
432 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
433 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
434 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
435 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
436 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
437 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
438 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
439 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
440
441 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
442 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
443 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
444 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
445 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
446 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
447 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
448 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
449 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
450 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
451 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
452 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
453
454 throttle_cfg->op_size =
455 qemu_opt_get_number(opts, "throttling.iops-size", 0);
456
457 if (!throttle_is_valid(throttle_cfg, errp)) {
458 return;
459 }
460 }
461
462 if (detect_zeroes) {
463 *detect_zeroes =
464 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
465 qemu_opt_get(opts, "detect-zeroes"),
466 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
467 &local_error);
468 if (local_error) {
469 error_propagate(errp, local_error);
470 return;
471 }
472 }
473 }
474
475 /* Takes the ownership of bs_opts */
476 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
477 Error **errp)
478 {
479 const char *buf;
480 int bdrv_flags = 0;
481 int on_read_error, on_write_error;
482 bool account_invalid, account_failed;
483 bool writethrough, read_only;
484 BlockBackend *blk;
485 BlockDriverState *bs;
486 ThrottleConfig cfg;
487 int snapshot = 0;
488 Error *error = NULL;
489 QemuOpts *opts;
490 QDict *interval_dict = NULL;
491 QList *interval_list = NULL;
492 const char *id;
493 BlockdevDetectZeroesOptions detect_zeroes =
494 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
495 const char *throttling_group = NULL;
496
497 /* Check common options by copying from bs_opts to opts, all other options
498 * stay in bs_opts for processing by bdrv_open(). */
499 id = qdict_get_try_str(bs_opts, "id");
500 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, errp);
501 if (!opts) {
502 goto err_no_opts;
503 }
504
505 if (!qemu_opts_absorb_qdict(opts, bs_opts, errp)) {
506 goto early_err;
507 }
508
509 if (id) {
510 qdict_del(bs_opts, "id");
511 }
512
513 /* extract parameters */
514 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
515
516 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
517 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
518
519 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
520
521 id = qemu_opts_id(opts);
522
523 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
524 qdict_array_split(interval_dict, &interval_list);
525
526 if (qdict_size(interval_dict) != 0) {
527 error_setg(errp, "Invalid option stats-intervals.%s",
528 qdict_first(interval_dict)->key);
529 goto early_err;
530 }
531
532 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
533 &detect_zeroes, &error);
534 if (error) {
535 error_propagate(errp, error);
536 goto early_err;
537 }
538
539 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
540 if (is_help_option(buf)) {
541 qemu_printf("Supported formats:");
542 bdrv_iterate_format(bdrv_format_print, NULL, false);
543 qemu_printf("\nSupported formats (read-only):");
544 bdrv_iterate_format(bdrv_format_print, NULL, true);
545 qemu_printf("\n");
546 goto early_err;
547 }
548
549 if (qdict_haskey(bs_opts, "driver")) {
550 error_setg(errp, "Cannot specify both 'driver' and 'format'");
551 goto early_err;
552 }
553 qdict_put_str(bs_opts, "driver", buf);
554 }
555
556 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
557 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
558 on_write_error = parse_block_error_action(buf, 0, &error);
559 if (error) {
560 error_propagate(errp, error);
561 goto early_err;
562 }
563 }
564
565 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
566 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
567 on_read_error = parse_block_error_action(buf, 1, &error);
568 if (error) {
569 error_propagate(errp, error);
570 goto early_err;
571 }
572 }
573
574 if (snapshot) {
575 bdrv_flags |= BDRV_O_SNAPSHOT;
576 }
577
578 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
579
580 /* init */
581 if ((!file || !*file) && !qdict_size(bs_opts)) {
582 BlockBackendRootState *blk_rs;
583
584 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
585 blk_rs = blk_get_root_state(blk);
586 blk_rs->open_flags = bdrv_flags;
587 blk_rs->read_only = read_only;
588 blk_rs->detect_zeroes = detect_zeroes;
589
590 qobject_unref(bs_opts);
591 } else {
592 if (file && !*file) {
593 file = NULL;
594 }
595
596 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
597 * with other callers) rather than what we want as the real defaults.
598 * Apply the defaults here instead. */
599 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
600 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
601 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
602 read_only ? "on" : "off");
603 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on");
604 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
605
606 if (runstate_check(RUN_STATE_INMIGRATE)) {
607 bdrv_flags |= BDRV_O_INACTIVE;
608 }
609
610 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
611 if (!blk) {
612 goto err_no_bs_opts;
613 }
614 bs = blk_bs(blk);
615
616 bs->detect_zeroes = detect_zeroes;
617
618 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
619
620 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
621 blk_unref(blk);
622 blk = NULL;
623 goto err_no_bs_opts;
624 }
625 }
626
627 /* disk I/O throttling */
628 if (throttle_enabled(&cfg)) {
629 if (!throttling_group) {
630 throttling_group = id;
631 }
632 blk_io_limits_enable(blk, throttling_group);
633 blk_set_io_limits(blk, &cfg);
634 }
635
636 blk_set_enable_write_cache(blk, !writethrough);
637 blk_set_on_error(blk, on_read_error, on_write_error);
638
639 if (!monitor_add_blk(blk, id, errp)) {
640 blk_unref(blk);
641 blk = NULL;
642 goto err_no_bs_opts;
643 }
644
645 err_no_bs_opts:
646 qemu_opts_del(opts);
647 qobject_unref(interval_dict);
648 qobject_unref(interval_list);
649 return blk;
650
651 early_err:
652 qemu_opts_del(opts);
653 qobject_unref(interval_dict);
654 qobject_unref(interval_list);
655 err_no_opts:
656 qobject_unref(bs_opts);
657 return NULL;
658 }
659
660 /* Takes the ownership of bs_opts */
661 BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
662 {
663 int bdrv_flags = 0;
664
665 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
666 * with other callers) rather than what we want as the real defaults.
667 * Apply the defaults here instead. */
668 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
669 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
670 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
671
672 if (runstate_check(RUN_STATE_INMIGRATE)) {
673 bdrv_flags |= BDRV_O_INACTIVE;
674 }
675
676 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
677 }
678
679 void blockdev_close_all_bdrv_states(void)
680 {
681 BlockDriverState *bs, *next_bs;
682
683 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
684 AioContext *ctx = bdrv_get_aio_context(bs);
685
686 aio_context_acquire(ctx);
687 bdrv_unref(bs);
688 aio_context_release(ctx);
689 }
690 }
691
692 /* Iterates over the list of monitor-owned BlockDriverStates */
693 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
694 {
695 return bs ? QTAILQ_NEXT(bs, monitor_list)
696 : QTAILQ_FIRST(&monitor_bdrv_states);
697 }
698
699 static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
700 Error **errp)
701 {
702 const char *value;
703
704 value = qemu_opt_get(opts, from);
705 if (value) {
706 if (qemu_opt_find(opts, to)) {
707 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
708 "same time", to, from);
709 return false;
710 }
711 }
712
713 /* rename all items in opts */
714 while ((value = qemu_opt_get(opts, from))) {
715 qemu_opt_set(opts, to, value, &error_abort);
716 qemu_opt_unset(opts, from);
717 }
718 return true;
719 }
720
721 QemuOptsList qemu_legacy_drive_opts = {
722 .name = "drive",
723 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
724 .desc = {
725 {
726 .name = "bus",
727 .type = QEMU_OPT_NUMBER,
728 .help = "bus number",
729 },{
730 .name = "unit",
731 .type = QEMU_OPT_NUMBER,
732 .help = "unit number (i.e. lun for scsi)",
733 },{
734 .name = "index",
735 .type = QEMU_OPT_NUMBER,
736 .help = "index number",
737 },{
738 .name = "media",
739 .type = QEMU_OPT_STRING,
740 .help = "media type (disk, cdrom)",
741 },{
742 .name = "if",
743 .type = QEMU_OPT_STRING,
744 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
745 },{
746 .name = "file",
747 .type = QEMU_OPT_STRING,
748 .help = "file name",
749 },
750
751 /* Options that are passed on, but have special semantics with -drive */
752 {
753 .name = BDRV_OPT_READ_ONLY,
754 .type = QEMU_OPT_BOOL,
755 .help = "open drive file as read-only",
756 },{
757 .name = "rerror",
758 .type = QEMU_OPT_STRING,
759 .help = "read error action",
760 },{
761 .name = "werror",
762 .type = QEMU_OPT_STRING,
763 .help = "write error action",
764 },{
765 .name = "copy-on-read",
766 .type = QEMU_OPT_BOOL,
767 .help = "copy read data from backing file into image file",
768 },
769
770 { /* end of list */ }
771 },
772 };
773
774 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
775 Error **errp)
776 {
777 const char *value;
778 BlockBackend *blk;
779 DriveInfo *dinfo = NULL;
780 QDict *bs_opts;
781 QemuOpts *legacy_opts;
782 DriveMediaType media = MEDIA_DISK;
783 BlockInterfaceType type;
784 int max_devs, bus_id, unit_id, index;
785 const char *werror, *rerror;
786 bool read_only = false;
787 bool copy_on_read;
788 const char *filename;
789 int i;
790
791 /* Change legacy command line options into QMP ones */
792 static const struct {
793 const char *from;
794 const char *to;
795 } opt_renames[] = {
796 { "iops", "throttling.iops-total" },
797 { "iops_rd", "throttling.iops-read" },
798 { "iops_wr", "throttling.iops-write" },
799
800 { "bps", "throttling.bps-total" },
801 { "bps_rd", "throttling.bps-read" },
802 { "bps_wr", "throttling.bps-write" },
803
804 { "iops_max", "throttling.iops-total-max" },
805 { "iops_rd_max", "throttling.iops-read-max" },
806 { "iops_wr_max", "throttling.iops-write-max" },
807
808 { "bps_max", "throttling.bps-total-max" },
809 { "bps_rd_max", "throttling.bps-read-max" },
810 { "bps_wr_max", "throttling.bps-write-max" },
811
812 { "iops_size", "throttling.iops-size" },
813
814 { "group", "throttling.group" },
815
816 { "readonly", BDRV_OPT_READ_ONLY },
817 };
818
819 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
820 if (!qemu_opt_rename(all_opts, opt_renames[i].from,
821 opt_renames[i].to, errp)) {
822 return NULL;
823 }
824 }
825
826 value = qemu_opt_get(all_opts, "cache");
827 if (value) {
828 int flags = 0;
829 bool writethrough;
830
831 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
832 error_setg(errp, "invalid cache option");
833 return NULL;
834 }
835
836 /* Specific options take precedence */
837 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
838 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
839 !writethrough, &error_abort);
840 }
841 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
842 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
843 !!(flags & BDRV_O_NOCACHE), &error_abort);
844 }
845 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
846 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
847 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
848 }
849 qemu_opt_unset(all_opts, "cache");
850 }
851
852 /* Get a QDict for processing the options */
853 bs_opts = qdict_new();
854 qemu_opts_to_qdict(all_opts, bs_opts);
855
856 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
857 &error_abort);
858 if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) {
859 goto fail;
860 }
861
862 /* Media type */
863 value = qemu_opt_get(legacy_opts, "media");
864 if (value) {
865 if (!strcmp(value, "disk")) {
866 media = MEDIA_DISK;
867 } else if (!strcmp(value, "cdrom")) {
868 media = MEDIA_CDROM;
869 read_only = true;
870 } else {
871 error_setg(errp, "'%s' invalid media", value);
872 goto fail;
873 }
874 }
875
876 /* copy-on-read is disabled with a warning for read-only devices */
877 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
878 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
879
880 if (read_only && copy_on_read) {
881 warn_report("disabling copy-on-read on read-only drive");
882 copy_on_read = false;
883 }
884
885 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
886 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
887
888 /* Controller type */
889 value = qemu_opt_get(legacy_opts, "if");
890 if (value) {
891 for (type = 0;
892 type < IF_COUNT && strcmp(value, if_name[type]);
893 type++) {
894 }
895 if (type == IF_COUNT) {
896 error_setg(errp, "unsupported bus type '%s'", value);
897 goto fail;
898 }
899 } else {
900 type = block_default_type;
901 }
902
903 /* Device address specified by bus/unit or index.
904 * If none was specified, try to find the first free one. */
905 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
906 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
907 index = qemu_opt_get_number(legacy_opts, "index", -1);
908
909 max_devs = if_max_devs[type];
910
911 if (index != -1) {
912 if (bus_id != 0 || unit_id != -1) {
913 error_setg(errp, "index cannot be used with bus and unit");
914 goto fail;
915 }
916 bus_id = drive_index_to_bus_id(type, index);
917 unit_id = drive_index_to_unit_id(type, index);
918 }
919
920 if (unit_id == -1) {
921 unit_id = 0;
922 while (drive_get(type, bus_id, unit_id) != NULL) {
923 unit_id++;
924 if (max_devs && unit_id >= max_devs) {
925 unit_id -= max_devs;
926 bus_id++;
927 }
928 }
929 }
930
931 if (max_devs && unit_id >= max_devs) {
932 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
933 goto fail;
934 }
935
936 if (drive_get(type, bus_id, unit_id) != NULL) {
937 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
938 bus_id, unit_id, index);
939 goto fail;
940 }
941
942 /* no id supplied -> create one */
943 if (qemu_opts_id(all_opts) == NULL) {
944 char *new_id;
945 const char *mediastr = "";
946 if (type == IF_IDE || type == IF_SCSI) {
947 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
948 }
949 if (max_devs) {
950 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
951 mediastr, unit_id);
952 } else {
953 new_id = g_strdup_printf("%s%s%i", if_name[type],
954 mediastr, unit_id);
955 }
956 qdict_put_str(bs_opts, "id", new_id);
957 g_free(new_id);
958 }
959
960 /* Add virtio block device */
961 if (type == IF_VIRTIO) {
962 QemuOpts *devopts;
963 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
964 &error_abort);
965 qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort);
966 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
967 &error_abort);
968 }
969
970 filename = qemu_opt_get(legacy_opts, "file");
971
972 /* Check werror/rerror compatibility with if=... */
973 werror = qemu_opt_get(legacy_opts, "werror");
974 if (werror != NULL) {
975 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
976 type != IF_NONE) {
977 error_setg(errp, "werror is not supported by this bus type");
978 goto fail;
979 }
980 qdict_put_str(bs_opts, "werror", werror);
981 }
982
983 rerror = qemu_opt_get(legacy_opts, "rerror");
984 if (rerror != NULL) {
985 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
986 type != IF_NONE) {
987 error_setg(errp, "rerror is not supported by this bus type");
988 goto fail;
989 }
990 qdict_put_str(bs_opts, "rerror", rerror);
991 }
992
993 /* Actual block device init: Functionality shared with blockdev-add */
994 blk = blockdev_init(filename, bs_opts, errp);
995 bs_opts = NULL;
996 if (!blk) {
997 goto fail;
998 }
999
1000 /* Create legacy DriveInfo */
1001 dinfo = g_malloc0(sizeof(*dinfo));
1002 dinfo->opts = all_opts;
1003
1004 dinfo->type = type;
1005 dinfo->bus = bus_id;
1006 dinfo->unit = unit_id;
1007
1008 blk_set_legacy_dinfo(blk, dinfo);
1009
1010 switch(type) {
1011 case IF_IDE:
1012 case IF_SCSI:
1013 case IF_XEN:
1014 case IF_NONE:
1015 dinfo->media_cd = media == MEDIA_CDROM;
1016 break;
1017 default:
1018 break;
1019 }
1020
1021 fail:
1022 qemu_opts_del(legacy_opts);
1023 qobject_unref(bs_opts);
1024 return dinfo;
1025 }
1026
1027 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1028 {
1029 BlockDriverState *bs;
1030
1031 bs = bdrv_lookup_bs(name, name, errp);
1032 if (bs == NULL) {
1033 return NULL;
1034 }
1035
1036 if (!bdrv_is_root_node(bs)) {
1037 error_setg(errp, "Need a root block node");
1038 return NULL;
1039 }
1040
1041 if (!bdrv_is_inserted(bs)) {
1042 error_setg(errp, "Device has no medium");
1043 return NULL;
1044 }
1045
1046 return bs;
1047 }
1048
1049 static void blockdev_do_action(TransactionAction *action, Error **errp)
1050 {
1051 TransactionActionList list;
1052
1053 list.value = action;
1054 list.next = NULL;
1055 qmp_transaction(&list, false, NULL, errp);
1056 }
1057
1058 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1059 bool has_node_name, const char *node_name,
1060 const char *snapshot_file,
1061 bool has_snapshot_node_name,
1062 const char *snapshot_node_name,
1063 bool has_format, const char *format,
1064 bool has_mode, NewImageMode mode, Error **errp)
1065 {
1066 BlockdevSnapshotSync snapshot = {
1067 .has_device = has_device,
1068 .device = (char *) device,
1069 .has_node_name = has_node_name,
1070 .node_name = (char *) node_name,
1071 .snapshot_file = (char *) snapshot_file,
1072 .has_snapshot_node_name = has_snapshot_node_name,
1073 .snapshot_node_name = (char *) snapshot_node_name,
1074 .has_format = has_format,
1075 .format = (char *) format,
1076 .has_mode = has_mode,
1077 .mode = mode,
1078 };
1079 TransactionAction action = {
1080 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1081 .u.blockdev_snapshot_sync.data = &snapshot,
1082 };
1083 blockdev_do_action(&action, errp);
1084 }
1085
1086 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1087 Error **errp)
1088 {
1089 BlockdevSnapshot snapshot_data = {
1090 .node = (char *) node,
1091 .overlay = (char *) overlay
1092 };
1093 TransactionAction action = {
1094 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1095 .u.blockdev_snapshot.data = &snapshot_data,
1096 };
1097 blockdev_do_action(&action, errp);
1098 }
1099
1100 void qmp_blockdev_snapshot_internal_sync(const char *device,
1101 const char *name,
1102 Error **errp)
1103 {
1104 BlockdevSnapshotInternal snapshot = {
1105 .device = (char *) device,
1106 .name = (char *) name
1107 };
1108 TransactionAction action = {
1109 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1110 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1111 };
1112 blockdev_do_action(&action, errp);
1113 }
1114
1115 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1116 bool has_id,
1117 const char *id,
1118 bool has_name,
1119 const char *name,
1120 Error **errp)
1121 {
1122 BlockDriverState *bs;
1123 AioContext *aio_context;
1124 QEMUSnapshotInfo sn;
1125 Error *local_err = NULL;
1126 SnapshotInfo *info = NULL;
1127 int ret;
1128
1129 bs = qmp_get_root_bs(device, errp);
1130 if (!bs) {
1131 return NULL;
1132 }
1133 aio_context = bdrv_get_aio_context(bs);
1134 aio_context_acquire(aio_context);
1135
1136 if (!has_id) {
1137 id = NULL;
1138 }
1139
1140 if (!has_name) {
1141 name = NULL;
1142 }
1143
1144 if (!id && !name) {
1145 error_setg(errp, "Name or id must be provided");
1146 goto out_aio_context;
1147 }
1148
1149 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1150 goto out_aio_context;
1151 }
1152
1153 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1154 if (local_err) {
1155 error_propagate(errp, local_err);
1156 goto out_aio_context;
1157 }
1158 if (!ret) {
1159 error_setg(errp,
1160 "Snapshot with id '%s' and name '%s' does not exist on "
1161 "device '%s'",
1162 STR_OR_NULL(id), STR_OR_NULL(name), device);
1163 goto out_aio_context;
1164 }
1165
1166 bdrv_snapshot_delete(bs, id, name, &local_err);
1167 if (local_err) {
1168 error_propagate(errp, local_err);
1169 goto out_aio_context;
1170 }
1171
1172 aio_context_release(aio_context);
1173
1174 info = g_new0(SnapshotInfo, 1);
1175 info->id = g_strdup(sn.id_str);
1176 info->name = g_strdup(sn.name);
1177 info->date_nsec = sn.date_nsec;
1178 info->date_sec = sn.date_sec;
1179 info->vm_state_size = sn.vm_state_size;
1180 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1181 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1182 if (sn.icount != -1ULL) {
1183 info->icount = sn.icount;
1184 info->has_icount = true;
1185 }
1186
1187 return info;
1188
1189 out_aio_context:
1190 aio_context_release(aio_context);
1191 return NULL;
1192 }
1193
1194 /* New and old BlockDriverState structs for atomic group operations */
1195
1196 typedef struct BlkActionState BlkActionState;
1197
1198 /**
1199 * BlkActionOps:
1200 * Table of operations that define an Action.
1201 *
1202 * @instance_size: Size of state struct, in bytes.
1203 * @prepare: Prepare the work, must NOT be NULL.
1204 * @commit: Commit the changes, can be NULL.
1205 * @abort: Abort the changes on fail, can be NULL.
1206 * @clean: Clean up resources after all transaction actions have called
1207 * commit() or abort(). Can be NULL.
1208 *
1209 * Only prepare() may fail. In a single transaction, only one of commit() or
1210 * abort() will be called. clean() will always be called if it is present.
1211 */
1212 typedef struct BlkActionOps {
1213 size_t instance_size;
1214 void (*prepare)(BlkActionState *common, Error **errp);
1215 void (*commit)(BlkActionState *common);
1216 void (*abort)(BlkActionState *common);
1217 void (*clean)(BlkActionState *common);
1218 } BlkActionOps;
1219
1220 /**
1221 * BlkActionState:
1222 * Describes one Action's state within a Transaction.
1223 *
1224 * @action: QAPI-defined enum identifying which Action to perform.
1225 * @ops: Table of ActionOps this Action can perform.
1226 * @block_job_txn: Transaction which this action belongs to.
1227 * @entry: List membership for all Actions in this Transaction.
1228 *
1229 * This structure must be arranged as first member in a subclassed type,
1230 * assuming that the compiler will also arrange it to the same offsets as the
1231 * base class.
1232 */
1233 struct BlkActionState {
1234 TransactionAction *action;
1235 const BlkActionOps *ops;
1236 JobTxn *block_job_txn;
1237 TransactionProperties *txn_props;
1238 QTAILQ_ENTRY(BlkActionState) entry;
1239 };
1240
1241 /* internal snapshot private data */
1242 typedef struct InternalSnapshotState {
1243 BlkActionState common;
1244 BlockDriverState *bs;
1245 QEMUSnapshotInfo sn;
1246 bool created;
1247 } InternalSnapshotState;
1248
1249
1250 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1251 {
1252 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1253 error_setg(errp,
1254 "Action '%s' does not support Transaction property "
1255 "completion-mode = %s",
1256 TransactionActionKind_str(s->action->type),
1257 ActionCompletionMode_str(s->txn_props->completion_mode));
1258 return -1;
1259 }
1260 return 0;
1261 }
1262
1263 static void internal_snapshot_prepare(BlkActionState *common,
1264 Error **errp)
1265 {
1266 Error *local_err = NULL;
1267 const char *device;
1268 const char *name;
1269 BlockDriverState *bs;
1270 QEMUSnapshotInfo old_sn, *sn;
1271 bool ret;
1272 qemu_timeval tv;
1273 BlockdevSnapshotInternal *internal;
1274 InternalSnapshotState *state;
1275 AioContext *aio_context;
1276 int ret1;
1277
1278 g_assert(common->action->type ==
1279 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1280 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1281 state = DO_UPCAST(InternalSnapshotState, common, common);
1282
1283 /* 1. parse input */
1284 device = internal->device;
1285 name = internal->name;
1286
1287 /* 2. check for validation */
1288 if (action_check_completion_mode(common, errp) < 0) {
1289 return;
1290 }
1291
1292 bs = qmp_get_root_bs(device, errp);
1293 if (!bs) {
1294 return;
1295 }
1296
1297 aio_context = bdrv_get_aio_context(bs);
1298 aio_context_acquire(aio_context);
1299
1300 state->bs = bs;
1301
1302 /* Paired with .clean() */
1303 bdrv_drained_begin(bs);
1304
1305 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1306 goto out;
1307 }
1308
1309 if (bdrv_is_read_only(bs)) {
1310 error_setg(errp, "Device '%s' is read only", device);
1311 goto out;
1312 }
1313
1314 if (!bdrv_can_snapshot(bs)) {
1315 error_setg(errp, "Block format '%s' used by device '%s' "
1316 "does not support internal snapshots",
1317 bs->drv->format_name, device);
1318 goto out;
1319 }
1320
1321 if (!strlen(name)) {
1322 error_setg(errp, "Name is empty");
1323 goto out;
1324 }
1325
1326 /* check whether a snapshot with name exist */
1327 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1328 &local_err);
1329 if (local_err) {
1330 error_propagate(errp, local_err);
1331 goto out;
1332 } else if (ret) {
1333 error_setg(errp,
1334 "Snapshot with name '%s' already exists on device '%s'",
1335 name, device);
1336 goto out;
1337 }
1338
1339 /* 3. take the snapshot */
1340 sn = &state->sn;
1341 pstrcpy(sn->name, sizeof(sn->name), name);
1342 qemu_gettimeofday(&tv);
1343 sn->date_sec = tv.tv_sec;
1344 sn->date_nsec = tv.tv_usec * 1000;
1345 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1346 if (replay_mode != REPLAY_MODE_NONE) {
1347 sn->icount = replay_get_current_icount();
1348 } else {
1349 sn->icount = -1ULL;
1350 }
1351
1352 ret1 = bdrv_snapshot_create(bs, sn);
1353 if (ret1 < 0) {
1354 error_setg_errno(errp, -ret1,
1355 "Failed to create snapshot '%s' on device '%s'",
1356 name, device);
1357 goto out;
1358 }
1359
1360 /* 4. succeed, mark a snapshot is created */
1361 state->created = true;
1362
1363 out:
1364 aio_context_release(aio_context);
1365 }
1366
1367 static void internal_snapshot_abort(BlkActionState *common)
1368 {
1369 InternalSnapshotState *state =
1370 DO_UPCAST(InternalSnapshotState, common, common);
1371 BlockDriverState *bs = state->bs;
1372 QEMUSnapshotInfo *sn = &state->sn;
1373 AioContext *aio_context;
1374 Error *local_error = NULL;
1375
1376 if (!state->created) {
1377 return;
1378 }
1379
1380 aio_context = bdrv_get_aio_context(state->bs);
1381 aio_context_acquire(aio_context);
1382
1383 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1384 error_reportf_err(local_error,
1385 "Failed to delete snapshot with id '%s' and "
1386 "name '%s' on device '%s' in abort: ",
1387 sn->id_str, sn->name,
1388 bdrv_get_device_name(bs));
1389 }
1390
1391 aio_context_release(aio_context);
1392 }
1393
1394 static void internal_snapshot_clean(BlkActionState *common)
1395 {
1396 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1397 common, common);
1398 AioContext *aio_context;
1399
1400 if (!state->bs) {
1401 return;
1402 }
1403
1404 aio_context = bdrv_get_aio_context(state->bs);
1405 aio_context_acquire(aio_context);
1406
1407 bdrv_drained_end(state->bs);
1408
1409 aio_context_release(aio_context);
1410 }
1411
1412 /* external snapshot private data */
1413 typedef struct ExternalSnapshotState {
1414 BlkActionState common;
1415 BlockDriverState *old_bs;
1416 BlockDriverState *new_bs;
1417 bool overlay_appended;
1418 } ExternalSnapshotState;
1419
1420 static void external_snapshot_prepare(BlkActionState *common,
1421 Error **errp)
1422 {
1423 int ret;
1424 int flags = 0;
1425 QDict *options = NULL;
1426 Error *local_err = NULL;
1427 /* Device and node name of the image to generate the snapshot from */
1428 const char *device;
1429 const char *node_name;
1430 /* Reference to the new image (for 'blockdev-snapshot') */
1431 const char *snapshot_ref;
1432 /* File name of the new image (for 'blockdev-snapshot-sync') */
1433 const char *new_image_file;
1434 ExternalSnapshotState *state =
1435 DO_UPCAST(ExternalSnapshotState, common, common);
1436 TransactionAction *action = common->action;
1437 AioContext *aio_context;
1438 uint64_t perm, shared;
1439
1440 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1441 * purpose but a different set of parameters */
1442 switch (action->type) {
1443 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1444 {
1445 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1446 device = s->node;
1447 node_name = s->node;
1448 new_image_file = NULL;
1449 snapshot_ref = s->overlay;
1450 }
1451 break;
1452 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1453 {
1454 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1455 device = s->has_device ? s->device : NULL;
1456 node_name = s->has_node_name ? s->node_name : NULL;
1457 new_image_file = s->snapshot_file;
1458 snapshot_ref = NULL;
1459 }
1460 break;
1461 default:
1462 g_assert_not_reached();
1463 }
1464
1465 /* start processing */
1466 if (action_check_completion_mode(common, errp) < 0) {
1467 return;
1468 }
1469
1470 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1471 if (!state->old_bs) {
1472 return;
1473 }
1474
1475 aio_context = bdrv_get_aio_context(state->old_bs);
1476 aio_context_acquire(aio_context);
1477
1478 /* Paired with .clean() */
1479 bdrv_drained_begin(state->old_bs);
1480
1481 if (!bdrv_is_inserted(state->old_bs)) {
1482 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1483 goto out;
1484 }
1485
1486 if (bdrv_op_is_blocked(state->old_bs,
1487 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1488 goto out;
1489 }
1490
1491 if (!bdrv_is_read_only(state->old_bs)) {
1492 if (bdrv_flush(state->old_bs)) {
1493 error_setg(errp, QERR_IO_ERROR);
1494 goto out;
1495 }
1496 }
1497
1498 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1499 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1500 const char *format = s->has_format ? s->format : "qcow2";
1501 enum NewImageMode mode;
1502 const char *snapshot_node_name =
1503 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1504
1505 if (node_name && !snapshot_node_name) {
1506 error_setg(errp, "New overlay node-name missing");
1507 goto out;
1508 }
1509
1510 if (snapshot_node_name &&
1511 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1512 error_setg(errp, "New overlay node-name already in use");
1513 goto out;
1514 }
1515
1516 flags = state->old_bs->open_flags;
1517 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1518 flags |= BDRV_O_NO_BACKING;
1519
1520 /* create new image w/backing file */
1521 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1522 if (mode != NEW_IMAGE_MODE_EXISTING) {
1523 int64_t size = bdrv_getlength(state->old_bs);
1524 if (size < 0) {
1525 error_setg_errno(errp, -size, "bdrv_getlength failed");
1526 goto out;
1527 }
1528 bdrv_refresh_filename(state->old_bs);
1529 bdrv_img_create(new_image_file, format,
1530 state->old_bs->filename,
1531 state->old_bs->drv->format_name,
1532 NULL, size, flags, false, &local_err);
1533 if (local_err) {
1534 error_propagate(errp, local_err);
1535 goto out;
1536 }
1537 }
1538
1539 options = qdict_new();
1540 if (snapshot_node_name) {
1541 qdict_put_str(options, "node-name", snapshot_node_name);
1542 }
1543 qdict_put_str(options, "driver", format);
1544 }
1545
1546 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1547 errp);
1548 /* We will manually add the backing_hd field to the bs later */
1549 if (!state->new_bs) {
1550 goto out;
1551 }
1552
1553 /*
1554 * Allow attaching a backing file to an overlay that's already in use only
1555 * if the parents don't assume that they are already seeing a valid image.
1556 * (Specifically, allow it as a mirror target, which is write-only access.)
1557 */
1558 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared);
1559 if (perm & BLK_PERM_CONSISTENT_READ) {
1560 error_setg(errp, "The overlay is already in use");
1561 goto out;
1562 }
1563
1564 if (state->new_bs->drv->is_filter) {
1565 error_setg(errp, "Filters cannot be used as overlays");
1566 goto out;
1567 }
1568
1569 if (bdrv_cow_child(state->new_bs)) {
1570 error_setg(errp, "The overlay already has a backing image");
1571 goto out;
1572 }
1573
1574 if (!state->new_bs->drv->supports_backing) {
1575 error_setg(errp, "The overlay does not support backing images");
1576 goto out;
1577 }
1578
1579 ret = bdrv_append(state->new_bs, state->old_bs, errp);
1580 if (ret < 0) {
1581 goto out;
1582 }
1583 state->overlay_appended = true;
1584
1585 out:
1586 aio_context_release(aio_context);
1587 }
1588
1589 static void external_snapshot_commit(BlkActionState *common)
1590 {
1591 ExternalSnapshotState *state =
1592 DO_UPCAST(ExternalSnapshotState, common, common);
1593 AioContext *aio_context;
1594
1595 aio_context = bdrv_get_aio_context(state->old_bs);
1596 aio_context_acquire(aio_context);
1597
1598 /* We don't need (or want) to use the transactional
1599 * bdrv_reopen_multiple() across all the entries at once, because we
1600 * don't want to abort all of them if one of them fails the reopen */
1601 if (!qatomic_read(&state->old_bs->copy_on_read)) {
1602 bdrv_reopen_set_read_only(state->old_bs, true, NULL);
1603 }
1604
1605 aio_context_release(aio_context);
1606 }
1607
1608 static void external_snapshot_abort(BlkActionState *common)
1609 {
1610 ExternalSnapshotState *state =
1611 DO_UPCAST(ExternalSnapshotState, common, common);
1612 if (state->new_bs) {
1613 if (state->overlay_appended) {
1614 AioContext *aio_context;
1615 AioContext *tmp_context;
1616 int ret;
1617
1618 aio_context = bdrv_get_aio_context(state->old_bs);
1619 aio_context_acquire(aio_context);
1620
1621 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1622 close state->old_bs; we need it */
1623 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1624
1625 /*
1626 * The call to bdrv_set_backing_hd() above returns state->old_bs to
1627 * the main AioContext. As we're still going to be using it, return
1628 * it to the AioContext it was before.
1629 */
1630 tmp_context = bdrv_get_aio_context(state->old_bs);
1631 if (aio_context != tmp_context) {
1632 aio_context_release(aio_context);
1633 aio_context_acquire(tmp_context);
1634
1635 ret = bdrv_try_set_aio_context(state->old_bs,
1636 aio_context, NULL);
1637 assert(ret == 0);
1638
1639 aio_context_release(tmp_context);
1640 aio_context_acquire(aio_context);
1641 }
1642
1643 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1644 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1645
1646 aio_context_release(aio_context);
1647 }
1648 }
1649 }
1650
1651 static void external_snapshot_clean(BlkActionState *common)
1652 {
1653 ExternalSnapshotState *state =
1654 DO_UPCAST(ExternalSnapshotState, common, common);
1655 AioContext *aio_context;
1656
1657 if (!state->old_bs) {
1658 return;
1659 }
1660
1661 aio_context = bdrv_get_aio_context(state->old_bs);
1662 aio_context_acquire(aio_context);
1663
1664 bdrv_drained_end(state->old_bs);
1665 bdrv_unref(state->new_bs);
1666
1667 aio_context_release(aio_context);
1668 }
1669
1670 typedef struct DriveBackupState {
1671 BlkActionState common;
1672 BlockDriverState *bs;
1673 BlockJob *job;
1674 } DriveBackupState;
1675
1676 static BlockJob *do_backup_common(BackupCommon *backup,
1677 BlockDriverState *bs,
1678 BlockDriverState *target_bs,
1679 AioContext *aio_context,
1680 JobTxn *txn, Error **errp);
1681
1682 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1683 {
1684 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1685 DriveBackup *backup;
1686 BlockDriverState *bs;
1687 BlockDriverState *target_bs;
1688 BlockDriverState *source = NULL;
1689 AioContext *aio_context;
1690 AioContext *old_context;
1691 QDict *options;
1692 Error *local_err = NULL;
1693 int flags;
1694 int64_t size;
1695 bool set_backing_hd = false;
1696 int ret;
1697
1698 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1699 backup = common->action->u.drive_backup.data;
1700
1701 if (!backup->has_mode) {
1702 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1703 }
1704
1705 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1706 if (!bs) {
1707 return;
1708 }
1709
1710 if (!bs->drv) {
1711 error_setg(errp, "Device has no medium");
1712 return;
1713 }
1714
1715 aio_context = bdrv_get_aio_context(bs);
1716 aio_context_acquire(aio_context);
1717
1718 /* Paired with .clean() */
1719 bdrv_drained_begin(bs);
1720
1721 if (!backup->has_format) {
1722 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
1723 NULL : (char *) bs->drv->format_name;
1724 }
1725
1726 /* Early check to avoid creating target */
1727 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
1728 goto out;
1729 }
1730
1731 flags = bs->open_flags | BDRV_O_RDWR;
1732
1733 /*
1734 * See if we have a backing HD we can use to create our new image
1735 * on top of.
1736 */
1737 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
1738 /*
1739 * Backup will not replace the source by the target, so none
1740 * of the filters skipped here will be removed (in contrast to
1741 * mirror). Therefore, we can skip all of them when looking
1742 * for the first COW relationship.
1743 */
1744 source = bdrv_cow_bs(bdrv_skip_filters(bs));
1745 if (!source) {
1746 backup->sync = MIRROR_SYNC_MODE_FULL;
1747 }
1748 }
1749 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
1750 source = bs;
1751 flags |= BDRV_O_NO_BACKING;
1752 set_backing_hd = true;
1753 }
1754
1755 size = bdrv_getlength(bs);
1756 if (size < 0) {
1757 error_setg_errno(errp, -size, "bdrv_getlength failed");
1758 goto out;
1759 }
1760
1761 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
1762 assert(backup->format);
1763 if (source) {
1764 /* Implicit filters should not appear in the filename */
1765 BlockDriverState *explicit_backing =
1766 bdrv_skip_implicit_filters(source);
1767
1768 bdrv_refresh_filename(explicit_backing);
1769 bdrv_img_create(backup->target, backup->format,
1770 explicit_backing->filename,
1771 explicit_backing->drv->format_name, NULL,
1772 size, flags, false, &local_err);
1773 } else {
1774 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
1775 size, flags, false, &local_err);
1776 }
1777 }
1778
1779 if (local_err) {
1780 error_propagate(errp, local_err);
1781 goto out;
1782 }
1783
1784 options = qdict_new();
1785 qdict_put_str(options, "discard", "unmap");
1786 qdict_put_str(options, "detect-zeroes", "unmap");
1787 if (backup->format) {
1788 qdict_put_str(options, "driver", backup->format);
1789 }
1790
1791 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
1792 if (!target_bs) {
1793 goto out;
1794 }
1795
1796 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
1797 old_context = bdrv_get_aio_context(target_bs);
1798 aio_context_release(aio_context);
1799 aio_context_acquire(old_context);
1800
1801 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
1802 if (ret < 0) {
1803 bdrv_unref(target_bs);
1804 aio_context_release(old_context);
1805 return;
1806 }
1807
1808 aio_context_release(old_context);
1809 aio_context_acquire(aio_context);
1810
1811 if (set_backing_hd) {
1812 if (bdrv_set_backing_hd(target_bs, source, errp) < 0) {
1813 goto unref;
1814 }
1815 }
1816
1817 state->bs = bs;
1818
1819 state->job = do_backup_common(qapi_DriveBackup_base(backup),
1820 bs, target_bs, aio_context,
1821 common->block_job_txn, errp);
1822
1823 unref:
1824 bdrv_unref(target_bs);
1825 out:
1826 aio_context_release(aio_context);
1827 }
1828
1829 static void drive_backup_commit(BlkActionState *common)
1830 {
1831 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1832 AioContext *aio_context;
1833
1834 aio_context = bdrv_get_aio_context(state->bs);
1835 aio_context_acquire(aio_context);
1836
1837 assert(state->job);
1838 job_start(&state->job->job);
1839
1840 aio_context_release(aio_context);
1841 }
1842
1843 static void drive_backup_abort(BlkActionState *common)
1844 {
1845 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1846
1847 if (state->job) {
1848 AioContext *aio_context;
1849
1850 aio_context = bdrv_get_aio_context(state->bs);
1851 aio_context_acquire(aio_context);
1852
1853 job_cancel_sync(&state->job->job);
1854
1855 aio_context_release(aio_context);
1856 }
1857 }
1858
1859 static void drive_backup_clean(BlkActionState *common)
1860 {
1861 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1862 AioContext *aio_context;
1863
1864 if (!state->bs) {
1865 return;
1866 }
1867
1868 aio_context = bdrv_get_aio_context(state->bs);
1869 aio_context_acquire(aio_context);
1870
1871 bdrv_drained_end(state->bs);
1872
1873 aio_context_release(aio_context);
1874 }
1875
1876 typedef struct BlockdevBackupState {
1877 BlkActionState common;
1878 BlockDriverState *bs;
1879 BlockJob *job;
1880 } BlockdevBackupState;
1881
1882 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1883 {
1884 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1885 BlockdevBackup *backup;
1886 BlockDriverState *bs;
1887 BlockDriverState *target_bs;
1888 AioContext *aio_context;
1889 AioContext *old_context;
1890 int ret;
1891
1892 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1893 backup = common->action->u.blockdev_backup.data;
1894
1895 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1896 if (!bs) {
1897 return;
1898 }
1899
1900 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
1901 if (!target_bs) {
1902 return;
1903 }
1904
1905 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
1906 aio_context = bdrv_get_aio_context(bs);
1907 old_context = bdrv_get_aio_context(target_bs);
1908 aio_context_acquire(old_context);
1909
1910 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
1911 if (ret < 0) {
1912 aio_context_release(old_context);
1913 return;
1914 }
1915
1916 aio_context_release(old_context);
1917 aio_context_acquire(aio_context);
1918 state->bs = bs;
1919
1920 /* Paired with .clean() */
1921 bdrv_drained_begin(state->bs);
1922
1923 state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
1924 bs, target_bs, aio_context,
1925 common->block_job_txn, errp);
1926
1927 aio_context_release(aio_context);
1928 }
1929
1930 static void blockdev_backup_commit(BlkActionState *common)
1931 {
1932 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1933 AioContext *aio_context;
1934
1935 aio_context = bdrv_get_aio_context(state->bs);
1936 aio_context_acquire(aio_context);
1937
1938 assert(state->job);
1939 job_start(&state->job->job);
1940
1941 aio_context_release(aio_context);
1942 }
1943
1944 static void blockdev_backup_abort(BlkActionState *common)
1945 {
1946 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1947
1948 if (state->job) {
1949 AioContext *aio_context;
1950
1951 aio_context = bdrv_get_aio_context(state->bs);
1952 aio_context_acquire(aio_context);
1953
1954 job_cancel_sync(&state->job->job);
1955
1956 aio_context_release(aio_context);
1957 }
1958 }
1959
1960 static void blockdev_backup_clean(BlkActionState *common)
1961 {
1962 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1963 AioContext *aio_context;
1964
1965 if (!state->bs) {
1966 return;
1967 }
1968
1969 aio_context = bdrv_get_aio_context(state->bs);
1970 aio_context_acquire(aio_context);
1971
1972 bdrv_drained_end(state->bs);
1973
1974 aio_context_release(aio_context);
1975 }
1976
1977 typedef struct BlockDirtyBitmapState {
1978 BlkActionState common;
1979 BdrvDirtyBitmap *bitmap;
1980 BlockDriverState *bs;
1981 HBitmap *backup;
1982 bool prepared;
1983 bool was_enabled;
1984 } BlockDirtyBitmapState;
1985
1986 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
1987 Error **errp)
1988 {
1989 Error *local_err = NULL;
1990 BlockDirtyBitmapAdd *action;
1991 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1992 common, common);
1993
1994 if (action_check_completion_mode(common, errp) < 0) {
1995 return;
1996 }
1997
1998 action = common->action->u.block_dirty_bitmap_add.data;
1999 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2000 qmp_block_dirty_bitmap_add(action->node, action->name,
2001 action->has_granularity, action->granularity,
2002 action->has_persistent, action->persistent,
2003 action->has_disabled, action->disabled,
2004 &local_err);
2005
2006 if (!local_err) {
2007 state->prepared = true;
2008 } else {
2009 error_propagate(errp, local_err);
2010 }
2011 }
2012
2013 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2014 {
2015 BlockDirtyBitmapAdd *action;
2016 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2017 common, common);
2018
2019 action = common->action->u.block_dirty_bitmap_add.data;
2020 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2021 * then the node reference and bitmap name must have been valid.
2022 */
2023 if (state->prepared) {
2024 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2025 }
2026 }
2027
2028 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2029 Error **errp)
2030 {
2031 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2032 common, common);
2033 BlockDirtyBitmap *action;
2034
2035 if (action_check_completion_mode(common, errp) < 0) {
2036 return;
2037 }
2038
2039 action = common->action->u.block_dirty_bitmap_clear.data;
2040 state->bitmap = block_dirty_bitmap_lookup(action->node,
2041 action->name,
2042 &state->bs,
2043 errp);
2044 if (!state->bitmap) {
2045 return;
2046 }
2047
2048 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
2049 return;
2050 }
2051
2052 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2053 }
2054
2055 static void block_dirty_bitmap_restore(BlkActionState *common)
2056 {
2057 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2058 common, common);
2059
2060 if (state->backup) {
2061 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
2062 }
2063 }
2064
2065 static void block_dirty_bitmap_free_backup(BlkActionState *common)
2066 {
2067 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2068 common, common);
2069
2070 hbitmap_free(state->backup);
2071 }
2072
2073 static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
2074 Error **errp)
2075 {
2076 BlockDirtyBitmap *action;
2077 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2078 common, common);
2079
2080 if (action_check_completion_mode(common, errp) < 0) {
2081 return;
2082 }
2083
2084 action = common->action->u.block_dirty_bitmap_enable.data;
2085 state->bitmap = block_dirty_bitmap_lookup(action->node,
2086 action->name,
2087 NULL,
2088 errp);
2089 if (!state->bitmap) {
2090 return;
2091 }
2092
2093 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2094 return;
2095 }
2096
2097 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2098 bdrv_enable_dirty_bitmap(state->bitmap);
2099 }
2100
2101 static void block_dirty_bitmap_enable_abort(BlkActionState *common)
2102 {
2103 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2104 common, common);
2105
2106 if (!state->was_enabled) {
2107 bdrv_disable_dirty_bitmap(state->bitmap);
2108 }
2109 }
2110
2111 static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
2112 Error **errp)
2113 {
2114 BlockDirtyBitmap *action;
2115 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2116 common, common);
2117
2118 if (action_check_completion_mode(common, errp) < 0) {
2119 return;
2120 }
2121
2122 action = common->action->u.block_dirty_bitmap_disable.data;
2123 state->bitmap = block_dirty_bitmap_lookup(action->node,
2124 action->name,
2125 NULL,
2126 errp);
2127 if (!state->bitmap) {
2128 return;
2129 }
2130
2131 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2132 return;
2133 }
2134
2135 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2136 bdrv_disable_dirty_bitmap(state->bitmap);
2137 }
2138
2139 static void block_dirty_bitmap_disable_abort(BlkActionState *common)
2140 {
2141 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2142 common, common);
2143
2144 if (state->was_enabled) {
2145 bdrv_enable_dirty_bitmap(state->bitmap);
2146 }
2147 }
2148
2149 static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
2150 Error **errp)
2151 {
2152 BlockDirtyBitmapMerge *action;
2153 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2154 common, common);
2155
2156 if (action_check_completion_mode(common, errp) < 0) {
2157 return;
2158 }
2159
2160 action = common->action->u.block_dirty_bitmap_merge.data;
2161
2162 state->bitmap = block_dirty_bitmap_merge(action->node, action->target,
2163 action->bitmaps, &state->backup,
2164 errp);
2165 }
2166
2167 static void block_dirty_bitmap_remove_prepare(BlkActionState *common,
2168 Error **errp)
2169 {
2170 BlockDirtyBitmap *action;
2171 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2172 common, common);
2173
2174 if (action_check_completion_mode(common, errp) < 0) {
2175 return;
2176 }
2177
2178 action = common->action->u.block_dirty_bitmap_remove.data;
2179
2180 state->bitmap = block_dirty_bitmap_remove(action->node, action->name,
2181 false, &state->bs, errp);
2182 if (state->bitmap) {
2183 bdrv_dirty_bitmap_skip_store(state->bitmap, true);
2184 bdrv_dirty_bitmap_set_busy(state->bitmap, true);
2185 }
2186 }
2187
2188 static void block_dirty_bitmap_remove_abort(BlkActionState *common)
2189 {
2190 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2191 common, common);
2192
2193 if (state->bitmap) {
2194 bdrv_dirty_bitmap_skip_store(state->bitmap, false);
2195 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2196 }
2197 }
2198
2199 static void block_dirty_bitmap_remove_commit(BlkActionState *common)
2200 {
2201 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2202 common, common);
2203
2204 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2205 bdrv_release_dirty_bitmap(state->bitmap);
2206 }
2207
2208 static void abort_prepare(BlkActionState *common, Error **errp)
2209 {
2210 error_setg(errp, "Transaction aborted using Abort action");
2211 }
2212
2213 static void abort_commit(BlkActionState *common)
2214 {
2215 g_assert_not_reached(); /* this action never succeeds */
2216 }
2217
2218 static const BlkActionOps actions[] = {
2219 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2220 .instance_size = sizeof(ExternalSnapshotState),
2221 .prepare = external_snapshot_prepare,
2222 .commit = external_snapshot_commit,
2223 .abort = external_snapshot_abort,
2224 .clean = external_snapshot_clean,
2225 },
2226 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2227 .instance_size = sizeof(ExternalSnapshotState),
2228 .prepare = external_snapshot_prepare,
2229 .commit = external_snapshot_commit,
2230 .abort = external_snapshot_abort,
2231 .clean = external_snapshot_clean,
2232 },
2233 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2234 .instance_size = sizeof(DriveBackupState),
2235 .prepare = drive_backup_prepare,
2236 .commit = drive_backup_commit,
2237 .abort = drive_backup_abort,
2238 .clean = drive_backup_clean,
2239 },
2240 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2241 .instance_size = sizeof(BlockdevBackupState),
2242 .prepare = blockdev_backup_prepare,
2243 .commit = blockdev_backup_commit,
2244 .abort = blockdev_backup_abort,
2245 .clean = blockdev_backup_clean,
2246 },
2247 [TRANSACTION_ACTION_KIND_ABORT] = {
2248 .instance_size = sizeof(BlkActionState),
2249 .prepare = abort_prepare,
2250 .commit = abort_commit,
2251 },
2252 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2253 .instance_size = sizeof(InternalSnapshotState),
2254 .prepare = internal_snapshot_prepare,
2255 .abort = internal_snapshot_abort,
2256 .clean = internal_snapshot_clean,
2257 },
2258 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2259 .instance_size = sizeof(BlockDirtyBitmapState),
2260 .prepare = block_dirty_bitmap_add_prepare,
2261 .abort = block_dirty_bitmap_add_abort,
2262 },
2263 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2264 .instance_size = sizeof(BlockDirtyBitmapState),
2265 .prepare = block_dirty_bitmap_clear_prepare,
2266 .commit = block_dirty_bitmap_free_backup,
2267 .abort = block_dirty_bitmap_restore,
2268 },
2269 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = {
2270 .instance_size = sizeof(BlockDirtyBitmapState),
2271 .prepare = block_dirty_bitmap_enable_prepare,
2272 .abort = block_dirty_bitmap_enable_abort,
2273 },
2274 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = {
2275 .instance_size = sizeof(BlockDirtyBitmapState),
2276 .prepare = block_dirty_bitmap_disable_prepare,
2277 .abort = block_dirty_bitmap_disable_abort,
2278 },
2279 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = {
2280 .instance_size = sizeof(BlockDirtyBitmapState),
2281 .prepare = block_dirty_bitmap_merge_prepare,
2282 .commit = block_dirty_bitmap_free_backup,
2283 .abort = block_dirty_bitmap_restore,
2284 },
2285 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE] = {
2286 .instance_size = sizeof(BlockDirtyBitmapState),
2287 .prepare = block_dirty_bitmap_remove_prepare,
2288 .commit = block_dirty_bitmap_remove_commit,
2289 .abort = block_dirty_bitmap_remove_abort,
2290 },
2291 /* Where are transactions for MIRROR, COMMIT and STREAM?
2292 * Although these blockjobs use transaction callbacks like the backup job,
2293 * these jobs do not necessarily adhere to transaction semantics.
2294 * These jobs may not fully undo all of their actions on abort, nor do they
2295 * necessarily work in transactions with more than one job in them.
2296 */
2297 };
2298
2299 /**
2300 * Allocate a TransactionProperties structure if necessary, and fill
2301 * that structure with desired defaults if they are unset.
2302 */
2303 static TransactionProperties *get_transaction_properties(
2304 TransactionProperties *props)
2305 {
2306 if (!props) {
2307 props = g_new0(TransactionProperties, 1);
2308 }
2309
2310 if (!props->has_completion_mode) {
2311 props->has_completion_mode = true;
2312 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2313 }
2314
2315 return props;
2316 }
2317
2318 /*
2319 * 'Atomic' group operations. The operations are performed as a set, and if
2320 * any fail then we roll back all operations in the group.
2321 */
2322 void qmp_transaction(TransactionActionList *dev_list,
2323 bool has_props,
2324 struct TransactionProperties *props,
2325 Error **errp)
2326 {
2327 TransactionActionList *dev_entry = dev_list;
2328 JobTxn *block_job_txn = NULL;
2329 BlkActionState *state, *next;
2330 Error *local_err = NULL;
2331
2332 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states;
2333 QTAILQ_INIT(&snap_bdrv_states);
2334
2335 /* Does this transaction get canceled as a group on failure?
2336 * If not, we don't really need to make a JobTxn.
2337 */
2338 props = get_transaction_properties(props);
2339 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2340 block_job_txn = job_txn_new();
2341 }
2342
2343 /* drain all i/o before any operations */
2344 bdrv_drain_all();
2345
2346 /* We don't do anything in this loop that commits us to the operations */
2347 while (NULL != dev_entry) {
2348 TransactionAction *dev_info = NULL;
2349 const BlkActionOps *ops;
2350
2351 dev_info = dev_entry->value;
2352 dev_entry = dev_entry->next;
2353
2354 assert(dev_info->type < ARRAY_SIZE(actions));
2355
2356 ops = &actions[dev_info->type];
2357 assert(ops->instance_size > 0);
2358
2359 state = g_malloc0(ops->instance_size);
2360 state->ops = ops;
2361 state->action = dev_info;
2362 state->block_job_txn = block_job_txn;
2363 state->txn_props = props;
2364 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2365
2366 state->ops->prepare(state, &local_err);
2367 if (local_err) {
2368 error_propagate(errp, local_err);
2369 goto delete_and_fail;
2370 }
2371 }
2372
2373 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) {
2374 if (state->ops->commit) {
2375 state->ops->commit(state);
2376 }
2377 }
2378
2379 /* success */
2380 goto exit;
2381
2382 delete_and_fail:
2383 /* failure, and it is all-or-none; roll back all operations */
2384 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) {
2385 if (state->ops->abort) {
2386 state->ops->abort(state);
2387 }
2388 }
2389 exit:
2390 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2391 if (state->ops->clean) {
2392 state->ops->clean(state);
2393 }
2394 g_free(state);
2395 }
2396 if (!has_props) {
2397 qapi_free_TransactionProperties(props);
2398 }
2399 job_txn_unref(block_job_txn);
2400 }
2401
2402 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2403 const char *name,
2404 Error **errp)
2405 {
2406 BdrvDirtyBitmap *bitmap;
2407 BlockDriverState *bs;
2408 BlockDirtyBitmapSha256 *ret = NULL;
2409 char *sha256;
2410
2411 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2412 if (!bitmap || !bs) {
2413 return NULL;
2414 }
2415
2416 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2417 if (sha256 == NULL) {
2418 return NULL;
2419 }
2420
2421 ret = g_new(BlockDirtyBitmapSha256, 1);
2422 ret->sha256 = sha256;
2423
2424 return ret;
2425 }
2426
2427 void coroutine_fn qmp_block_resize(bool has_device, const char *device,
2428 bool has_node_name, const char *node_name,
2429 int64_t size, Error **errp)
2430 {
2431 Error *local_err = NULL;
2432 BlockBackend *blk;
2433 BlockDriverState *bs;
2434 AioContext *old_ctx;
2435
2436 bs = bdrv_lookup_bs(has_device ? device : NULL,
2437 has_node_name ? node_name : NULL,
2438 &local_err);
2439 if (local_err) {
2440 error_propagate(errp, local_err);
2441 return;
2442 }
2443
2444 if (size < 0) {
2445 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2446 return;
2447 }
2448
2449 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2450 error_setg(errp, QERR_DEVICE_IN_USE, device);
2451 return;
2452 }
2453
2454 blk = blk_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp);
2455 if (!blk) {
2456 return;
2457 }
2458
2459 bdrv_co_lock(bs);
2460 bdrv_drained_begin(bs);
2461 bdrv_co_unlock(bs);
2462
2463 old_ctx = bdrv_co_enter(bs);
2464 blk_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
2465 bdrv_co_leave(bs, old_ctx);
2466
2467 bdrv_co_lock(bs);
2468 bdrv_drained_end(bs);
2469 blk_unref(blk);
2470 bdrv_co_unlock(bs);
2471 }
2472
2473 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
2474 bool has_base, const char *base,
2475 bool has_base_node, const char *base_node,
2476 bool has_backing_file, const char *backing_file,
2477 bool has_bottom, const char *bottom,
2478 bool has_speed, int64_t speed,
2479 bool has_on_error, BlockdevOnError on_error,
2480 bool has_filter_node_name, const char *filter_node_name,
2481 bool has_auto_finalize, bool auto_finalize,
2482 bool has_auto_dismiss, bool auto_dismiss,
2483 Error **errp)
2484 {
2485 BlockDriverState *bs, *iter, *iter_end;
2486 BlockDriverState *base_bs = NULL;
2487 BlockDriverState *bottom_bs = NULL;
2488 AioContext *aio_context;
2489 Error *local_err = NULL;
2490 int job_flags = JOB_DEFAULT;
2491
2492 if (has_base && has_base_node) {
2493 error_setg(errp, "'base' and 'base-node' cannot be specified "
2494 "at the same time");
2495 return;
2496 }
2497
2498 if (has_base && has_bottom) {
2499 error_setg(errp, "'base' and 'bottom' cannot be specified "
2500 "at the same time");
2501 return;
2502 }
2503
2504 if (has_bottom && has_base_node) {
2505 error_setg(errp, "'bottom' and 'base-node' cannot be specified "
2506 "at the same time");
2507 return;
2508 }
2509
2510 if (!has_on_error) {
2511 on_error = BLOCKDEV_ON_ERROR_REPORT;
2512 }
2513
2514 bs = bdrv_lookup_bs(device, device, errp);
2515 if (!bs) {
2516 return;
2517 }
2518
2519 aio_context = bdrv_get_aio_context(bs);
2520 aio_context_acquire(aio_context);
2521
2522 if (has_base) {
2523 base_bs = bdrv_find_backing_image(bs, base);
2524 if (base_bs == NULL) {
2525 error_setg(errp, "Can't find '%s' in the backing chain", base);
2526 goto out;
2527 }
2528 assert(bdrv_get_aio_context(base_bs) == aio_context);
2529 }
2530
2531 if (has_base_node) {
2532 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2533 if (!base_bs) {
2534 goto out;
2535 }
2536 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
2537 error_setg(errp, "Node '%s' is not a backing image of '%s'",
2538 base_node, device);
2539 goto out;
2540 }
2541 assert(bdrv_get_aio_context(base_bs) == aio_context);
2542 bdrv_refresh_filename(base_bs);
2543 }
2544
2545 if (has_bottom) {
2546 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp);
2547 if (!bottom_bs) {
2548 goto out;
2549 }
2550 if (!bottom_bs->drv) {
2551 error_setg(errp, "Node '%s' is not open", bottom);
2552 goto out;
2553 }
2554 if (bottom_bs->drv->is_filter) {
2555 error_setg(errp, "Node '%s' is a filter, use a non-filter node "
2556 "as 'bottom'", bottom);
2557 goto out;
2558 }
2559 if (!bdrv_chain_contains(bs, bottom_bs)) {
2560 error_setg(errp, "Node '%s' is not in a chain starting from '%s'",
2561 bottom, device);
2562 goto out;
2563 }
2564 assert(bdrv_get_aio_context(bottom_bs) == aio_context);
2565 }
2566
2567 /*
2568 * Check for op blockers in the whole chain between bs and base (or bottom)
2569 */
2570 iter_end = has_bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs;
2571 for (iter = bs; iter && iter != iter_end;
2572 iter = bdrv_filter_or_cow_bs(iter))
2573 {
2574 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
2575 goto out;
2576 }
2577 }
2578
2579 /* if we are streaming the entire chain, the result will have no backing
2580 * file, and specifying one is therefore an error */
2581 if (base_bs == NULL && has_backing_file) {
2582 error_setg(errp, "backing file specified, but streaming the "
2583 "entire chain");
2584 goto out;
2585 }
2586
2587 if (has_auto_finalize && !auto_finalize) {
2588 job_flags |= JOB_MANUAL_FINALIZE;
2589 }
2590 if (has_auto_dismiss && !auto_dismiss) {
2591 job_flags |= JOB_MANUAL_DISMISS;
2592 }
2593
2594 stream_start(has_job_id ? job_id : NULL, bs, base_bs, backing_file,
2595 bottom_bs, job_flags, has_speed ? speed : 0, on_error,
2596 filter_node_name, &local_err);
2597 if (local_err) {
2598 error_propagate(errp, local_err);
2599 goto out;
2600 }
2601
2602 trace_qmp_block_stream(bs);
2603
2604 out:
2605 aio_context_release(aio_context);
2606 }
2607
2608 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
2609 bool has_base_node, const char *base_node,
2610 bool has_base, const char *base,
2611 bool has_top_node, const char *top_node,
2612 bool has_top, const char *top,
2613 bool has_backing_file, const char *backing_file,
2614 bool has_speed, int64_t speed,
2615 bool has_on_error, BlockdevOnError on_error,
2616 bool has_filter_node_name, const char *filter_node_name,
2617 bool has_auto_finalize, bool auto_finalize,
2618 bool has_auto_dismiss, bool auto_dismiss,
2619 Error **errp)
2620 {
2621 BlockDriverState *bs;
2622 BlockDriverState *iter;
2623 BlockDriverState *base_bs, *top_bs;
2624 AioContext *aio_context;
2625 Error *local_err = NULL;
2626 int job_flags = JOB_DEFAULT;
2627 uint64_t top_perm, top_shared;
2628
2629 if (!has_speed) {
2630 speed = 0;
2631 }
2632 if (!has_on_error) {
2633 on_error = BLOCKDEV_ON_ERROR_REPORT;
2634 }
2635 if (!has_filter_node_name) {
2636 filter_node_name = NULL;
2637 }
2638 if (has_auto_finalize && !auto_finalize) {
2639 job_flags |= JOB_MANUAL_FINALIZE;
2640 }
2641 if (has_auto_dismiss && !auto_dismiss) {
2642 job_flags |= JOB_MANUAL_DISMISS;
2643 }
2644
2645 /* Important Note:
2646 * libvirt relies on the DeviceNotFound error class in order to probe for
2647 * live commit feature versions; for this to work, we must make sure to
2648 * perform the device lookup before any generic errors that may occur in a
2649 * scenario in which all optional arguments are omitted. */
2650 bs = qmp_get_root_bs(device, &local_err);
2651 if (!bs) {
2652 bs = bdrv_lookup_bs(device, device, NULL);
2653 if (!bs) {
2654 error_free(local_err);
2655 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2656 "Device '%s' not found", device);
2657 } else {
2658 error_propagate(errp, local_err);
2659 }
2660 return;
2661 }
2662
2663 aio_context = bdrv_get_aio_context(bs);
2664 aio_context_acquire(aio_context);
2665
2666 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2667 goto out;
2668 }
2669
2670 /* default top_bs is the active layer */
2671 top_bs = bs;
2672
2673 if (has_top_node && has_top) {
2674 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
2675 goto out;
2676 } else if (has_top_node) {
2677 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
2678 if (top_bs == NULL) {
2679 goto out;
2680 }
2681 if (!bdrv_chain_contains(bs, top_bs)) {
2682 error_setg(errp, "'%s' is not in this backing file chain",
2683 top_node);
2684 goto out;
2685 }
2686 } else if (has_top && top) {
2687 /* This strcmp() is just a shortcut, there is no need to
2688 * refresh @bs's filename. If it mismatches,
2689 * bdrv_find_backing_image() will do the refresh and may still
2690 * return @bs. */
2691 if (strcmp(bs->filename, top) != 0) {
2692 top_bs = bdrv_find_backing_image(bs, top);
2693 }
2694 }
2695
2696 if (top_bs == NULL) {
2697 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2698 goto out;
2699 }
2700
2701 assert(bdrv_get_aio_context(top_bs) == aio_context);
2702
2703 if (has_base_node && has_base) {
2704 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
2705 goto out;
2706 } else if (has_base_node) {
2707 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2708 if (base_bs == NULL) {
2709 goto out;
2710 }
2711 if (!bdrv_chain_contains(top_bs, base_bs)) {
2712 error_setg(errp, "'%s' is not in this backing file chain",
2713 base_node);
2714 goto out;
2715 }
2716 } else if (has_base && base) {
2717 base_bs = bdrv_find_backing_image(top_bs, base);
2718 if (base_bs == NULL) {
2719 error_setg(errp, "Can't find '%s' in the backing chain", base);
2720 goto out;
2721 }
2722 } else {
2723 base_bs = bdrv_find_base(top_bs);
2724 if (base_bs == NULL) {
2725 error_setg(errp, "There is no backimg image");
2726 goto out;
2727 }
2728 }
2729
2730 assert(bdrv_get_aio_context(base_bs) == aio_context);
2731
2732 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs);
2733 iter = bdrv_filter_or_cow_bs(iter))
2734 {
2735 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2736 goto out;
2737 }
2738 }
2739
2740 /* Do not allow attempts to commit an image into itself */
2741 if (top_bs == base_bs) {
2742 error_setg(errp, "cannot commit an image into itself");
2743 goto out;
2744 }
2745
2746 /*
2747 * Active commit is required if and only if someone has taken a
2748 * WRITE permission on the top node. Historically, we have always
2749 * used active commit for top nodes, so continue that practice
2750 * lest we possibly break clients that rely on this behavior, e.g.
2751 * to later attach this node to a writing parent.
2752 * (Active commit is never really wrong.)
2753 */
2754 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared);
2755 if (top_perm & BLK_PERM_WRITE ||
2756 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs))
2757 {
2758 if (has_backing_file) {
2759 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) {
2760 error_setg(errp, "'backing-file' specified,"
2761 " but 'top' is the active layer");
2762 } else {
2763 error_setg(errp, "'backing-file' specified, but 'top' has a "
2764 "writer on it");
2765 }
2766 goto out;
2767 }
2768 if (!has_job_id) {
2769 /*
2770 * Emulate here what block_job_create() does, because it
2771 * is possible that @bs != @top_bs (the block job should
2772 * be named after @bs, even if @top_bs is the actual
2773 * source)
2774 */
2775 job_id = bdrv_get_device_name(bs);
2776 }
2777 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error,
2778 filter_node_name, NULL, NULL, false, &local_err);
2779 } else {
2780 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
2781 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2782 goto out;
2783 }
2784 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags,
2785 speed, on_error, has_backing_file ? backing_file : NULL,
2786 filter_node_name, &local_err);
2787 }
2788 if (local_err != NULL) {
2789 error_propagate(errp, local_err);
2790 goto out;
2791 }
2792
2793 out:
2794 aio_context_release(aio_context);
2795 }
2796
2797 /* Common QMP interface for drive-backup and blockdev-backup */
2798 static BlockJob *do_backup_common(BackupCommon *backup,
2799 BlockDriverState *bs,
2800 BlockDriverState *target_bs,
2801 AioContext *aio_context,
2802 JobTxn *txn, Error **errp)
2803 {
2804 BlockJob *job = NULL;
2805 BdrvDirtyBitmap *bmap = NULL;
2806 BackupPerf perf = { .max_workers = 64 };
2807 int job_flags = JOB_DEFAULT;
2808
2809 if (!backup->has_speed) {
2810 backup->speed = 0;
2811 }
2812 if (!backup->has_on_source_error) {
2813 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2814 }
2815 if (!backup->has_on_target_error) {
2816 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2817 }
2818 if (!backup->has_job_id) {
2819 backup->job_id = NULL;
2820 }
2821 if (!backup->has_auto_finalize) {
2822 backup->auto_finalize = true;
2823 }
2824 if (!backup->has_auto_dismiss) {
2825 backup->auto_dismiss = true;
2826 }
2827 if (!backup->has_compress) {
2828 backup->compress = false;
2829 }
2830
2831 if (backup->x_perf) {
2832 if (backup->x_perf->has_use_copy_range) {
2833 perf.use_copy_range = backup->x_perf->use_copy_range;
2834 }
2835 if (backup->x_perf->has_max_workers) {
2836 perf.max_workers = backup->x_perf->max_workers;
2837 }
2838 if (backup->x_perf->has_max_chunk) {
2839 perf.max_chunk = backup->x_perf->max_chunk;
2840 }
2841 }
2842
2843 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
2844 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
2845 /* done before desugaring 'incremental' to print the right message */
2846 if (!backup->has_bitmap) {
2847 error_setg(errp, "must provide a valid bitmap name for "
2848 "'%s' sync mode", MirrorSyncMode_str(backup->sync));
2849 return NULL;
2850 }
2851 }
2852
2853 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) {
2854 if (backup->has_bitmap_mode &&
2855 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) {
2856 error_setg(errp, "Bitmap sync mode must be '%s' "
2857 "when using sync mode '%s'",
2858 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS),
2859 MirrorSyncMode_str(backup->sync));
2860 return NULL;
2861 }
2862 backup->has_bitmap_mode = true;
2863 backup->sync = MIRROR_SYNC_MODE_BITMAP;
2864 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS;
2865 }
2866
2867 if (backup->has_bitmap) {
2868 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
2869 if (!bmap) {
2870 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
2871 return NULL;
2872 }
2873 if (!backup->has_bitmap_mode) {
2874 error_setg(errp, "Bitmap sync mode must be given "
2875 "when providing a bitmap");
2876 return NULL;
2877 }
2878 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2879 return NULL;
2880 }
2881
2882 /* This does not produce a useful bitmap artifact: */
2883 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
2884 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap"
2885 " outputs", MirrorSyncMode_str(backup->sync));
2886 return NULL;
2887 }
2888
2889 /* If the bitmap isn't used for input or output, this is useless: */
2890 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER &&
2891 backup->sync != MIRROR_SYNC_MODE_BITMAP) {
2892 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect"
2893 " when combined with sync mode '%s'",
2894 BitmapSyncMode_str(backup->bitmap_mode),
2895 MirrorSyncMode_str(backup->sync));
2896 return NULL;
2897 }
2898 }
2899
2900 if (!backup->has_bitmap && backup->has_bitmap_mode) {
2901 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap");
2902 return NULL;
2903 }
2904
2905 if (!backup->auto_finalize) {
2906 job_flags |= JOB_MANUAL_FINALIZE;
2907 }
2908 if (!backup->auto_dismiss) {
2909 job_flags |= JOB_MANUAL_DISMISS;
2910 }
2911
2912 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
2913 backup->sync, bmap, backup->bitmap_mode,
2914 backup->compress,
2915 backup->filter_node_name,
2916 &perf,
2917 backup->on_source_error,
2918 backup->on_target_error,
2919 job_flags, NULL, NULL, txn, errp);
2920 return job;
2921 }
2922
2923 void qmp_drive_backup(DriveBackup *backup, Error **errp)
2924 {
2925 TransactionAction action = {
2926 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP,
2927 .u.drive_backup.data = backup,
2928 };
2929 blockdev_do_action(&action, errp);
2930 }
2931
2932 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
2933 bool flat,
2934 Error **errp)
2935 {
2936 bool return_flat = has_flat && flat;
2937
2938 return bdrv_named_nodes_list(return_flat, errp);
2939 }
2940
2941 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
2942 {
2943 return bdrv_get_xdbg_block_graph(errp);
2944 }
2945
2946 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
2947 {
2948 TransactionAction action = {
2949 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
2950 .u.blockdev_backup.data = backup,
2951 };
2952 blockdev_do_action(&action, errp);
2953 }
2954
2955 /* Parameter check and block job starting for drive mirroring.
2956 * Caller should hold @device and @target's aio context (must be the same).
2957 **/
2958 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
2959 BlockDriverState *target,
2960 bool has_replaces, const char *replaces,
2961 enum MirrorSyncMode sync,
2962 BlockMirrorBackingMode backing_mode,
2963 bool zero_target,
2964 bool has_speed, int64_t speed,
2965 bool has_granularity, uint32_t granularity,
2966 bool has_buf_size, int64_t buf_size,
2967 bool has_on_source_error,
2968 BlockdevOnError on_source_error,
2969 bool has_on_target_error,
2970 BlockdevOnError on_target_error,
2971 bool has_unmap, bool unmap,
2972 bool has_filter_node_name,
2973 const char *filter_node_name,
2974 bool has_copy_mode, MirrorCopyMode copy_mode,
2975 bool has_auto_finalize, bool auto_finalize,
2976 bool has_auto_dismiss, bool auto_dismiss,
2977 Error **errp)
2978 {
2979 BlockDriverState *unfiltered_bs;
2980 int job_flags = JOB_DEFAULT;
2981
2982 if (!has_speed) {
2983 speed = 0;
2984 }
2985 if (!has_on_source_error) {
2986 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2987 }
2988 if (!has_on_target_error) {
2989 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2990 }
2991 if (!has_granularity) {
2992 granularity = 0;
2993 }
2994 if (!has_buf_size) {
2995 buf_size = 0;
2996 }
2997 if (!has_unmap) {
2998 unmap = true;
2999 }
3000 if (!has_filter_node_name) {
3001 filter_node_name = NULL;
3002 }
3003 if (!has_copy_mode) {
3004 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
3005 }
3006 if (has_auto_finalize && !auto_finalize) {
3007 job_flags |= JOB_MANUAL_FINALIZE;
3008 }
3009 if (has_auto_dismiss && !auto_dismiss) {
3010 job_flags |= JOB_MANUAL_DISMISS;
3011 }
3012
3013 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3014 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3015 "a value in range [512B, 64MB]");
3016 return;
3017 }
3018 if (granularity & (granularity - 1)) {
3019 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3020 "a power of 2");
3021 return;
3022 }
3023
3024 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3025 return;
3026 }
3027 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3028 return;
3029 }
3030
3031 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) {
3032 sync = MIRROR_SYNC_MODE_FULL;
3033 }
3034
3035 if (!has_replaces) {
3036 /* We want to mirror from @bs, but keep implicit filters on top */
3037 unfiltered_bs = bdrv_skip_implicit_filters(bs);
3038 if (unfiltered_bs != bs) {
3039 replaces = unfiltered_bs->node_name;
3040 has_replaces = true;
3041 }
3042 }
3043
3044 if (has_replaces) {
3045 BlockDriverState *to_replace_bs;
3046 AioContext *replace_aio_context;
3047 int64_t bs_size, replace_size;
3048
3049 bs_size = bdrv_getlength(bs);
3050 if (bs_size < 0) {
3051 error_setg_errno(errp, -bs_size, "Failed to query device's size");
3052 return;
3053 }
3054
3055 to_replace_bs = check_to_replace_node(bs, replaces, errp);
3056 if (!to_replace_bs) {
3057 return;
3058 }
3059
3060 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3061 aio_context_acquire(replace_aio_context);
3062 replace_size = bdrv_getlength(to_replace_bs);
3063 aio_context_release(replace_aio_context);
3064
3065 if (replace_size < 0) {
3066 error_setg_errno(errp, -replace_size,
3067 "Failed to query the replacement node's size");
3068 return;
3069 }
3070 if (bs_size != replace_size) {
3071 error_setg(errp, "cannot replace image with a mirror image of "
3072 "different size");
3073 return;
3074 }
3075 }
3076
3077 /* pass the node name to replace to mirror start since it's loose coupling
3078 * and will allow to check whether the node still exist at mirror completion
3079 */
3080 mirror_start(job_id, bs, target,
3081 has_replaces ? replaces : NULL, job_flags,
3082 speed, granularity, buf_size, sync, backing_mode, zero_target,
3083 on_source_error, on_target_error, unmap, filter_node_name,
3084 copy_mode, errp);
3085 }
3086
3087 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3088 {
3089 BlockDriverState *bs;
3090 BlockDriverState *target_backing_bs, *target_bs;
3091 AioContext *aio_context;
3092 AioContext *old_context;
3093 BlockMirrorBackingMode backing_mode;
3094 Error *local_err = NULL;
3095 QDict *options = NULL;
3096 int flags;
3097 int64_t size;
3098 const char *format = arg->format;
3099 bool zero_target;
3100 int ret;
3101
3102 bs = qmp_get_root_bs(arg->device, errp);
3103 if (!bs) {
3104 return;
3105 }
3106
3107 /* Early check to avoid creating target */
3108 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3109 return;
3110 }
3111
3112 aio_context = bdrv_get_aio_context(bs);
3113 aio_context_acquire(aio_context);
3114
3115 if (!arg->has_mode) {
3116 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3117 }
3118
3119 if (!arg->has_format) {
3120 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3121 ? NULL : bs->drv->format_name);
3122 }
3123
3124 flags = bs->open_flags | BDRV_O_RDWR;
3125 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs));
3126 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) {
3127 arg->sync = MIRROR_SYNC_MODE_FULL;
3128 }
3129 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3130 target_backing_bs = bs;
3131 }
3132
3133 size = bdrv_getlength(bs);
3134 if (size < 0) {
3135 error_setg_errno(errp, -size, "bdrv_getlength failed");
3136 goto out;
3137 }
3138
3139 if (arg->has_replaces) {
3140 if (!arg->has_node_name) {
3141 error_setg(errp, "a node-name must be provided when replacing a"
3142 " named node of the graph");
3143 goto out;
3144 }
3145 }
3146
3147 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3148 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3149 } else {
3150 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3151 }
3152
3153 /* Don't open backing image in create() */
3154 flags |= BDRV_O_NO_BACKING;
3155
3156 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs)
3157 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3158 {
3159 /* create new image w/o backing file */
3160 assert(format);
3161 bdrv_img_create(arg->target, format,
3162 NULL, NULL, NULL, size, flags, false, &local_err);
3163 } else {
3164 /* Implicit filters should not appear in the filename */
3165 BlockDriverState *explicit_backing =
3166 bdrv_skip_implicit_filters(target_backing_bs);
3167
3168 switch (arg->mode) {
3169 case NEW_IMAGE_MODE_EXISTING:
3170 break;
3171 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3172 /* create new image with backing file */
3173 bdrv_refresh_filename(explicit_backing);
3174 bdrv_img_create(arg->target, format,
3175 explicit_backing->filename,
3176 explicit_backing->drv->format_name,
3177 NULL, size, flags, false, &local_err);
3178 break;
3179 default:
3180 abort();
3181 }
3182 }
3183
3184 if (local_err) {
3185 error_propagate(errp, local_err);
3186 goto out;
3187 }
3188
3189 options = qdict_new();
3190 if (arg->has_node_name) {
3191 qdict_put_str(options, "node-name", arg->node_name);
3192 }
3193 if (format) {
3194 qdict_put_str(options, "driver", format);
3195 }
3196
3197 /* Mirroring takes care of copy-on-write using the source's backing
3198 * file.
3199 */
3200 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3201 if (!target_bs) {
3202 goto out;
3203 }
3204
3205 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
3206 (arg->mode == NEW_IMAGE_MODE_EXISTING ||
3207 !bdrv_has_zero_init(target_bs)));
3208
3209
3210 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
3211 old_context = bdrv_get_aio_context(target_bs);
3212 aio_context_release(aio_context);
3213 aio_context_acquire(old_context);
3214
3215 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
3216 if (ret < 0) {
3217 bdrv_unref(target_bs);
3218 aio_context_release(old_context);
3219 return;
3220 }
3221
3222 aio_context_release(old_context);
3223 aio_context_acquire(aio_context);
3224
3225 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3226 arg->has_replaces, arg->replaces, arg->sync,
3227 backing_mode, zero_target,
3228 arg->has_speed, arg->speed,
3229 arg->has_granularity, arg->granularity,
3230 arg->has_buf_size, arg->buf_size,
3231 arg->has_on_source_error, arg->on_source_error,
3232 arg->has_on_target_error, arg->on_target_error,
3233 arg->has_unmap, arg->unmap,
3234 false, NULL,
3235 arg->has_copy_mode, arg->copy_mode,
3236 arg->has_auto_finalize, arg->auto_finalize,
3237 arg->has_auto_dismiss, arg->auto_dismiss,
3238 errp);
3239 bdrv_unref(target_bs);
3240 out:
3241 aio_context_release(aio_context);
3242 }
3243
3244 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3245 const char *device, const char *target,
3246 bool has_replaces, const char *replaces,
3247 MirrorSyncMode sync,
3248 bool has_speed, int64_t speed,
3249 bool has_granularity, uint32_t granularity,
3250 bool has_buf_size, int64_t buf_size,
3251 bool has_on_source_error,
3252 BlockdevOnError on_source_error,
3253 bool has_on_target_error,
3254 BlockdevOnError on_target_error,
3255 bool has_filter_node_name,
3256 const char *filter_node_name,
3257 bool has_copy_mode, MirrorCopyMode copy_mode,
3258 bool has_auto_finalize, bool auto_finalize,
3259 bool has_auto_dismiss, bool auto_dismiss,
3260 Error **errp)
3261 {
3262 BlockDriverState *bs;
3263 BlockDriverState *target_bs;
3264 AioContext *aio_context;
3265 AioContext *old_context;
3266 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3267 bool zero_target;
3268 int ret;
3269
3270 bs = qmp_get_root_bs(device, errp);
3271 if (!bs) {
3272 return;
3273 }
3274
3275 target_bs = bdrv_lookup_bs(target, target, errp);
3276 if (!target_bs) {
3277 return;
3278 }
3279
3280 zero_target = (sync == MIRROR_SYNC_MODE_FULL);
3281
3282 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
3283 old_context = bdrv_get_aio_context(target_bs);
3284 aio_context = bdrv_get_aio_context(bs);
3285 aio_context_acquire(old_context);
3286
3287 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
3288
3289 aio_context_release(old_context);
3290 aio_context_acquire(aio_context);
3291
3292 if (ret < 0) {
3293 goto out;
3294 }
3295
3296 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3297 has_replaces, replaces, sync, backing_mode,
3298 zero_target, has_speed, speed,
3299 has_granularity, granularity,
3300 has_buf_size, buf_size,
3301 has_on_source_error, on_source_error,
3302 has_on_target_error, on_target_error,
3303 true, true,
3304 has_filter_node_name, filter_node_name,
3305 has_copy_mode, copy_mode,
3306 has_auto_finalize, auto_finalize,
3307 has_auto_dismiss, auto_dismiss,
3308 errp);
3309 out:
3310 aio_context_release(aio_context);
3311 }
3312
3313 /* Get a block job using its ID and acquire its AioContext */
3314 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3315 Error **errp)
3316 {
3317 BlockJob *job;
3318
3319 assert(id != NULL);
3320
3321 *aio_context = NULL;
3322
3323 job = block_job_get(id);
3324
3325 if (!job) {
3326 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3327 "Block job '%s' not found", id);
3328 return NULL;
3329 }
3330
3331 *aio_context = blk_get_aio_context(job->blk);
3332 aio_context_acquire(*aio_context);
3333
3334 return job;
3335 }
3336
3337 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3338 {
3339 AioContext *aio_context;
3340 BlockJob *job = find_block_job(device, &aio_context, errp);
3341
3342 if (!job) {
3343 return;
3344 }
3345
3346 block_job_set_speed(job, speed, errp);
3347 aio_context_release(aio_context);
3348 }
3349
3350 void qmp_block_job_cancel(const char *device,
3351 bool has_force, bool force, Error **errp)
3352 {
3353 AioContext *aio_context;
3354 BlockJob *job = find_block_job(device, &aio_context, errp);
3355
3356 if (!job) {
3357 return;
3358 }
3359
3360 if (!has_force) {
3361 force = false;
3362 }
3363
3364 if (job_user_paused(&job->job) && !force) {
3365 error_setg(errp, "The block job for device '%s' is currently paused",
3366 device);
3367 goto out;
3368 }
3369
3370 trace_qmp_block_job_cancel(job);
3371 job_user_cancel(&job->job, force, errp);
3372 out:
3373 aio_context_release(aio_context);
3374 }
3375
3376 void qmp_block_job_pause(const char *device, Error **errp)
3377 {
3378 AioContext *aio_context;
3379 BlockJob *job = find_block_job(device, &aio_context, errp);
3380
3381 if (!job) {
3382 return;
3383 }
3384
3385 trace_qmp_block_job_pause(job);
3386 job_user_pause(&job->job, errp);
3387 aio_context_release(aio_context);
3388 }
3389
3390 void qmp_block_job_resume(const char *device, Error **errp)
3391 {
3392 AioContext *aio_context;
3393 BlockJob *job = find_block_job(device, &aio_context, errp);
3394
3395 if (!job) {
3396 return;
3397 }
3398
3399 trace_qmp_block_job_resume(job);
3400 job_user_resume(&job->job, errp);
3401 aio_context_release(aio_context);
3402 }
3403
3404 void qmp_block_job_complete(const char *device, Error **errp)
3405 {
3406 AioContext *aio_context;
3407 BlockJob *job = find_block_job(device, &aio_context, errp);
3408
3409 if (!job) {
3410 return;
3411 }
3412
3413 trace_qmp_block_job_complete(job);
3414 job_complete(&job->job, errp);
3415 aio_context_release(aio_context);
3416 }
3417
3418 void qmp_block_job_finalize(const char *id, Error **errp)
3419 {
3420 AioContext *aio_context;
3421 BlockJob *job = find_block_job(id, &aio_context, errp);
3422
3423 if (!job) {
3424 return;
3425 }
3426
3427 trace_qmp_block_job_finalize(job);
3428 job_ref(&job->job);
3429 job_finalize(&job->job, errp);
3430
3431 /*
3432 * Job's context might have changed via job_finalize (and job_txn_apply
3433 * automatically acquires the new one), so make sure we release the correct
3434 * one.
3435 */
3436 aio_context = blk_get_aio_context(job->blk);
3437 job_unref(&job->job);
3438 aio_context_release(aio_context);
3439 }
3440
3441 void qmp_block_job_dismiss(const char *id, Error **errp)
3442 {
3443 AioContext *aio_context;
3444 BlockJob *bjob = find_block_job(id, &aio_context, errp);
3445 Job *job;
3446
3447 if (!bjob) {
3448 return;
3449 }
3450
3451 trace_qmp_block_job_dismiss(bjob);
3452 job = &bjob->job;
3453 job_dismiss(&job, errp);
3454 aio_context_release(aio_context);
3455 }
3456
3457 void qmp_change_backing_file(const char *device,
3458 const char *image_node_name,
3459 const char *backing_file,
3460 Error **errp)
3461 {
3462 BlockDriverState *bs = NULL;
3463 AioContext *aio_context;
3464 BlockDriverState *image_bs = NULL;
3465 Error *local_err = NULL;
3466 bool ro;
3467 int ret;
3468
3469 bs = qmp_get_root_bs(device, errp);
3470 if (!bs) {
3471 return;
3472 }
3473
3474 aio_context = bdrv_get_aio_context(bs);
3475 aio_context_acquire(aio_context);
3476
3477 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3478 if (local_err) {
3479 error_propagate(errp, local_err);
3480 goto out;
3481 }
3482
3483 if (!image_bs) {
3484 error_setg(errp, "image file not found");
3485 goto out;
3486 }
3487
3488 if (bdrv_find_base(image_bs) == image_bs) {
3489 error_setg(errp, "not allowing backing file change on an image "
3490 "without a backing file");
3491 goto out;
3492 }
3493
3494 /* even though we are not necessarily operating on bs, we need it to
3495 * determine if block ops are currently prohibited on the chain */
3496 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3497 goto out;
3498 }
3499
3500 /* final sanity check */
3501 if (!bdrv_chain_contains(bs, image_bs)) {
3502 error_setg(errp, "'%s' and image file are not in the same chain",
3503 device);
3504 goto out;
3505 }
3506
3507 /* if not r/w, reopen to make r/w */
3508 ro = bdrv_is_read_only(image_bs);
3509
3510 if (ro) {
3511 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) {
3512 goto out;
3513 }
3514 }
3515
3516 ret = bdrv_change_backing_file(image_bs, backing_file,
3517 image_bs->drv ? image_bs->drv->format_name : "",
3518 false);
3519
3520 if (ret < 0) {
3521 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3522 backing_file);
3523 /* don't exit here, so we can try to restore open flags if
3524 * appropriate */
3525 }
3526
3527 if (ro) {
3528 bdrv_reopen_set_read_only(image_bs, true, errp);
3529 }
3530
3531 out:
3532 aio_context_release(aio_context);
3533 }
3534
3535 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3536 {
3537 BlockDriverState *bs;
3538 QObject *obj;
3539 Visitor *v = qobject_output_visitor_new(&obj);
3540 QDict *qdict;
3541
3542 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3543 visit_complete(v, &obj);
3544 qdict = qobject_to(QDict, obj);
3545
3546 qdict_flatten(qdict);
3547
3548 if (!qdict_get_try_str(qdict, "node-name")) {
3549 error_setg(errp, "'node-name' must be specified for the root node");
3550 goto fail;
3551 }
3552
3553 bs = bds_tree_init(qdict, errp);
3554 if (!bs) {
3555 goto fail;
3556 }
3557
3558 bdrv_set_monitor_owned(bs);
3559
3560 fail:
3561 visit_free(v);
3562 }
3563
3564 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp)
3565 {
3566 BlockDriverState *bs;
3567 AioContext *ctx;
3568 QObject *obj;
3569 Visitor *v = qobject_output_visitor_new(&obj);
3570 BlockReopenQueue *queue;
3571 QDict *qdict;
3572
3573 /* Check for the selected node name */
3574 if (!options->has_node_name) {
3575 error_setg(errp, "node-name not specified");
3576 goto fail;
3577 }
3578
3579 bs = bdrv_find_node(options->node_name);
3580 if (!bs) {
3581 error_setg(errp, "Failed to find node with node-name='%s'",
3582 options->node_name);
3583 goto fail;
3584 }
3585
3586 /* Put all options in a QDict and flatten it */
3587 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3588 visit_complete(v, &obj);
3589 qdict = qobject_to(QDict, obj);
3590
3591 qdict_flatten(qdict);
3592
3593 /* Perform the reopen operation */
3594 ctx = bdrv_get_aio_context(bs);
3595 aio_context_acquire(ctx);
3596 bdrv_subtree_drained_begin(bs);
3597 queue = bdrv_reopen_queue(NULL, bs, qdict, false);
3598 bdrv_reopen_multiple(queue, errp);
3599 bdrv_subtree_drained_end(bs);
3600 aio_context_release(ctx);
3601
3602 fail:
3603 visit_free(v);
3604 }
3605
3606 void qmp_blockdev_del(const char *node_name, Error **errp)
3607 {
3608 AioContext *aio_context;
3609 BlockDriverState *bs;
3610
3611 bs = bdrv_find_node(node_name);
3612 if (!bs) {
3613 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3614 return;
3615 }
3616 if (bdrv_has_blk(bs)) {
3617 error_setg(errp, "Node %s is in use", node_name);
3618 return;
3619 }
3620 aio_context = bdrv_get_aio_context(bs);
3621 aio_context_acquire(aio_context);
3622
3623 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3624 goto out;
3625 }
3626
3627 if (!QTAILQ_IN_USE(bs, monitor_list)) {
3628 error_setg(errp, "Node %s is not owned by the monitor",
3629 bs->node_name);
3630 goto out;
3631 }
3632
3633 if (bs->refcnt > 1) {
3634 error_setg(errp, "Block device %s is in use",
3635 bdrv_get_device_or_node_name(bs));
3636 goto out;
3637 }
3638
3639 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3640 bdrv_unref(bs);
3641
3642 out:
3643 aio_context_release(aio_context);
3644 }
3645
3646 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
3647 const char *child_name)
3648 {
3649 BdrvChild *child;
3650
3651 QLIST_FOREACH(child, &parent_bs->children, next) {
3652 if (strcmp(child->name, child_name) == 0) {
3653 return child;
3654 }
3655 }
3656
3657 return NULL;
3658 }
3659
3660 void qmp_x_blockdev_change(const char *parent, bool has_child,
3661 const char *child, bool has_node,
3662 const char *node, Error **errp)
3663 {
3664 BlockDriverState *parent_bs, *new_bs = NULL;
3665 BdrvChild *p_child;
3666
3667 parent_bs = bdrv_lookup_bs(parent, parent, errp);
3668 if (!parent_bs) {
3669 return;
3670 }
3671
3672 if (has_child == has_node) {
3673 if (has_child) {
3674 error_setg(errp, "The parameters child and node are in conflict");
3675 } else {
3676 error_setg(errp, "Either child or node must be specified");
3677 }
3678 return;
3679 }
3680
3681 if (has_child) {
3682 p_child = bdrv_find_child(parent_bs, child);
3683 if (!p_child) {
3684 error_setg(errp, "Node '%s' does not have child '%s'",
3685 parent, child);
3686 return;
3687 }
3688 bdrv_del_child(parent_bs, p_child, errp);
3689 }
3690
3691 if (has_node) {
3692 new_bs = bdrv_find_node(node);
3693 if (!new_bs) {
3694 error_setg(errp, "Node '%s' not found", node);
3695 return;
3696 }
3697 bdrv_add_child(parent_bs, new_bs, errp);
3698 }
3699 }
3700
3701 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3702 {
3703 BlockJobInfoList *head = NULL, **tail = &head;
3704 BlockJob *job;
3705
3706 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
3707 BlockJobInfo *value;
3708 AioContext *aio_context;
3709
3710 if (block_job_is_internal(job)) {
3711 continue;
3712 }
3713 aio_context = blk_get_aio_context(job->blk);
3714 aio_context_acquire(aio_context);
3715 value = block_job_query(job, errp);
3716 aio_context_release(aio_context);
3717 if (!value) {
3718 qapi_free_BlockJobInfoList(head);
3719 return NULL;
3720 }
3721 QAPI_LIST_APPEND(tail, value);
3722 }
3723
3724 return head;
3725 }
3726
3727 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
3728 bool has_force, bool force, Error **errp)
3729 {
3730 AioContext *old_context;
3731 AioContext *new_context;
3732 BlockDriverState *bs;
3733
3734 bs = bdrv_find_node(node_name);
3735 if (!bs) {
3736 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3737 return;
3738 }
3739
3740 /* Protects against accidents. */
3741 if (!(has_force && force) && bdrv_has_blk(bs)) {
3742 error_setg(errp, "Node %s is associated with a BlockBackend and could "
3743 "be in use (use force=true to override this check)",
3744 node_name);
3745 return;
3746 }
3747
3748 if (iothread->type == QTYPE_QSTRING) {
3749 IOThread *obj = iothread_by_id(iothread->u.s);
3750 if (!obj) {
3751 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
3752 return;
3753 }
3754
3755 new_context = iothread_get_aio_context(obj);
3756 } else {
3757 new_context = qemu_get_aio_context();
3758 }
3759
3760 old_context = bdrv_get_aio_context(bs);
3761 aio_context_acquire(old_context);
3762
3763 bdrv_try_set_aio_context(bs, new_context, errp);
3764
3765 aio_context_release(old_context);
3766 }
3767
3768 QemuOptsList qemu_common_drive_opts = {
3769 .name = "drive",
3770 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3771 .desc = {
3772 {
3773 .name = "snapshot",
3774 .type = QEMU_OPT_BOOL,
3775 .help = "enable/disable snapshot mode",
3776 },{
3777 .name = "aio",
3778 .type = QEMU_OPT_STRING,
3779 .help = "host AIO implementation (threads, native, io_uring)",
3780 },{
3781 .name = BDRV_OPT_CACHE_WB,
3782 .type = QEMU_OPT_BOOL,
3783 .help = "Enable writeback mode",
3784 },{
3785 .name = "format",
3786 .type = QEMU_OPT_STRING,
3787 .help = "disk format (raw, qcow2, ...)",
3788 },{
3789 .name = "rerror",
3790 .type = QEMU_OPT_STRING,
3791 .help = "read error action",
3792 },{
3793 .name = "werror",
3794 .type = QEMU_OPT_STRING,
3795 .help = "write error action",
3796 },{
3797 .name = BDRV_OPT_READ_ONLY,
3798 .type = QEMU_OPT_BOOL,
3799 .help = "open drive file as read-only",
3800 },
3801
3802 THROTTLE_OPTS,
3803
3804 {
3805 .name = "throttling.group",
3806 .type = QEMU_OPT_STRING,
3807 .help = "name of the block throttling group",
3808 },{
3809 .name = "copy-on-read",
3810 .type = QEMU_OPT_BOOL,
3811 .help = "copy read data from backing file into image file",
3812 },{
3813 .name = "detect-zeroes",
3814 .type = QEMU_OPT_STRING,
3815 .help = "try to optimize zero writes (off, on, unmap)",
3816 },{
3817 .name = "stats-account-invalid",
3818 .type = QEMU_OPT_BOOL,
3819 .help = "whether to account for invalid I/O operations "
3820 "in the statistics",
3821 },{
3822 .name = "stats-account-failed",
3823 .type = QEMU_OPT_BOOL,
3824 .help = "whether to account for failed I/O operations "
3825 "in the statistics",
3826 },
3827 { /* end of list */ }
3828 },
3829 };
3830
3831 QemuOptsList qemu_drive_opts = {
3832 .name = "drive",
3833 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3834 .desc = {
3835 /*
3836 * no elements => accept any params
3837 * validation will happen later
3838 */
3839 { /* end of list */ }
3840 },
3841 };
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