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qcow2: Fix dangling pointer after reopen for 'file'
[qemu/kevin.git] / blockdev.c
blob094c0859624cc4157fab1c84e821541f1d9d9a75
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 | (read_only ? 0 : BDRV_O_RDWR);
587 blk_rs->detect_zeroes = detect_zeroes;
588
589 qobject_unref(bs_opts);
590 } else {
591 if (file && !*file) {
592 file = NULL;
593 }
594
595 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
596 * with other callers) rather than what we want as the real defaults.
597 * Apply the defaults here instead. */
598 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
599 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
600 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
601 read_only ? "on" : "off");
602 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on");
603 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
604
605 if (runstate_check(RUN_STATE_INMIGRATE)) {
606 bdrv_flags |= BDRV_O_INACTIVE;
607 }
608
609 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
610 if (!blk) {
611 goto err_no_bs_opts;
612 }
613 bs = blk_bs(blk);
614
615 bs->detect_zeroes = detect_zeroes;
616
617 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
618
619 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
620 blk_unref(blk);
621 blk = NULL;
622 goto err_no_bs_opts;
623 }
624 }
625
626 /* disk I/O throttling */
627 if (throttle_enabled(&cfg)) {
628 if (!throttling_group) {
629 throttling_group = id;
630 }
631 blk_io_limits_enable(blk, throttling_group);
632 blk_set_io_limits(blk, &cfg);
633 }
634
635 blk_set_enable_write_cache(blk, !writethrough);
636 blk_set_on_error(blk, on_read_error, on_write_error);
637
638 if (!monitor_add_blk(blk, id, errp)) {
639 blk_unref(blk);
640 blk = NULL;
641 goto err_no_bs_opts;
642 }
643
644 err_no_bs_opts:
645 qemu_opts_del(opts);
646 qobject_unref(interval_dict);
647 qobject_unref(interval_list);
648 return blk;
649
650 early_err:
651 qemu_opts_del(opts);
652 qobject_unref(interval_dict);
653 qobject_unref(interval_list);
654 err_no_opts:
655 qobject_unref(bs_opts);
656 return NULL;
657 }
658
659 /* Takes the ownership of bs_opts */
660 BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
661 {
662 int bdrv_flags = 0;
663
664 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
665 * with other callers) rather than what we want as the real defaults.
666 * Apply the defaults here instead. */
667 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
668 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
669 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
670
671 if (runstate_check(RUN_STATE_INMIGRATE)) {
672 bdrv_flags |= BDRV_O_INACTIVE;
673 }
674
675 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
676 }
677
678 void blockdev_close_all_bdrv_states(void)
679 {
680 BlockDriverState *bs, *next_bs;
681
682 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
683 AioContext *ctx = bdrv_get_aio_context(bs);
684
685 aio_context_acquire(ctx);
686 bdrv_unref(bs);
687 aio_context_release(ctx);
688 }
689 }
690
691 /* Iterates over the list of monitor-owned BlockDriverStates */
692 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
693 {
694 return bs ? QTAILQ_NEXT(bs, monitor_list)
695 : QTAILQ_FIRST(&monitor_bdrv_states);
696 }
697
698 static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
699 Error **errp)
700 {
701 const char *value;
702
703 value = qemu_opt_get(opts, from);
704 if (value) {
705 if (qemu_opt_find(opts, to)) {
706 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
707 "same time", to, from);
708 return false;
709 }
710 }
711
712 /* rename all items in opts */
713 while ((value = qemu_opt_get(opts, from))) {
714 qemu_opt_set(opts, to, value, &error_abort);
715 qemu_opt_unset(opts, from);
716 }
717 return true;
718 }
719
720 QemuOptsList qemu_legacy_drive_opts = {
721 .name = "drive",
722 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
723 .desc = {
724 {
725 .name = "bus",
726 .type = QEMU_OPT_NUMBER,
727 .help = "bus number",
728 },{
729 .name = "unit",
730 .type = QEMU_OPT_NUMBER,
731 .help = "unit number (i.e. lun for scsi)",
732 },{
733 .name = "index",
734 .type = QEMU_OPT_NUMBER,
735 .help = "index number",
736 },{
737 .name = "media",
738 .type = QEMU_OPT_STRING,
739 .help = "media type (disk, cdrom)",
740 },{
741 .name = "if",
742 .type = QEMU_OPT_STRING,
743 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
744 },{
745 .name = "file",
746 .type = QEMU_OPT_STRING,
747 .help = "file name",
748 },
749
750 /* Options that are passed on, but have special semantics with -drive */
751 {
752 .name = BDRV_OPT_READ_ONLY,
753 .type = QEMU_OPT_BOOL,
754 .help = "open drive file as read-only",
755 },{
756 .name = "rerror",
757 .type = QEMU_OPT_STRING,
758 .help = "read error action",
759 },{
760 .name = "werror",
761 .type = QEMU_OPT_STRING,
762 .help = "write error action",
763 },{
764 .name = "copy-on-read",
765 .type = QEMU_OPT_BOOL,
766 .help = "copy read data from backing file into image file",
767 },
768
769 { /* end of list */ }
770 },
771 };
772
773 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
774 Error **errp)
775 {
776 const char *value;
777 BlockBackend *blk;
778 DriveInfo *dinfo = NULL;
779 QDict *bs_opts;
780 QemuOpts *legacy_opts;
781 DriveMediaType media = MEDIA_DISK;
782 BlockInterfaceType type;
783 int max_devs, bus_id, unit_id, index;
784 const char *werror, *rerror;
785 bool read_only = false;
786 bool copy_on_read;
787 const char *filename;
788 int i;
789
790 /* Change legacy command line options into QMP ones */
791 static const struct {
792 const char *from;
793 const char *to;
794 } opt_renames[] = {
795 { "iops", "throttling.iops-total" },
796 { "iops_rd", "throttling.iops-read" },
797 { "iops_wr", "throttling.iops-write" },
798
799 { "bps", "throttling.bps-total" },
800 { "bps_rd", "throttling.bps-read" },
801 { "bps_wr", "throttling.bps-write" },
802
803 { "iops_max", "throttling.iops-total-max" },
804 { "iops_rd_max", "throttling.iops-read-max" },
805 { "iops_wr_max", "throttling.iops-write-max" },
806
807 { "bps_max", "throttling.bps-total-max" },
808 { "bps_rd_max", "throttling.bps-read-max" },
809 { "bps_wr_max", "throttling.bps-write-max" },
810
811 { "iops_size", "throttling.iops-size" },
812
813 { "group", "throttling.group" },
814
815 { "readonly", BDRV_OPT_READ_ONLY },
816 };
817
818 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
819 if (!qemu_opt_rename(all_opts, opt_renames[i].from,
820 opt_renames[i].to, errp)) {
821 return NULL;
822 }
823 }
824
825 value = qemu_opt_get(all_opts, "cache");
826 if (value) {
827 int flags = 0;
828 bool writethrough;
829
830 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
831 error_setg(errp, "invalid cache option");
832 return NULL;
833 }
834
835 /* Specific options take precedence */
836 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
837 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
838 !writethrough, &error_abort);
839 }
840 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
841 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
842 !!(flags & BDRV_O_NOCACHE), &error_abort);
843 }
844 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
845 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
846 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
847 }
848 qemu_opt_unset(all_opts, "cache");
849 }
850
851 /* Get a QDict for processing the options */
852 bs_opts = qdict_new();
853 qemu_opts_to_qdict(all_opts, bs_opts);
854
855 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
856 &error_abort);
857 if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) {
858 goto fail;
859 }
860
861 /* Media type */
862 value = qemu_opt_get(legacy_opts, "media");
863 if (value) {
864 if (!strcmp(value, "disk")) {
865 media = MEDIA_DISK;
866 } else if (!strcmp(value, "cdrom")) {
867 media = MEDIA_CDROM;
868 read_only = true;
869 } else {
870 error_setg(errp, "'%s' invalid media", value);
871 goto fail;
872 }
873 }
874
875 /* copy-on-read is disabled with a warning for read-only devices */
876 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
877 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
878
879 if (read_only && copy_on_read) {
880 warn_report("disabling copy-on-read on read-only drive");
881 copy_on_read = false;
882 }
883
884 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
885 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
886
887 /* Controller type */
888 value = qemu_opt_get(legacy_opts, "if");
889 if (value) {
890 for (type = 0;
891 type < IF_COUNT && strcmp(value, if_name[type]);
892 type++) {
893 }
894 if (type == IF_COUNT) {
895 error_setg(errp, "unsupported bus type '%s'", value);
896 goto fail;
897 }
898 } else {
899 type = block_default_type;
900 }
901
902 /* Device address specified by bus/unit or index.
903 * If none was specified, try to find the first free one. */
904 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
905 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
906 index = qemu_opt_get_number(legacy_opts, "index", -1);
907
908 max_devs = if_max_devs[type];
909
910 if (index != -1) {
911 if (bus_id != 0 || unit_id != -1) {
912 error_setg(errp, "index cannot be used with bus and unit");
913 goto fail;
914 }
915 bus_id = drive_index_to_bus_id(type, index);
916 unit_id = drive_index_to_unit_id(type, index);
917 }
918
919 if (unit_id == -1) {
920 unit_id = 0;
921 while (drive_get(type, bus_id, unit_id) != NULL) {
922 unit_id++;
923 if (max_devs && unit_id >= max_devs) {
924 unit_id -= max_devs;
925 bus_id++;
926 }
927 }
928 }
929
930 if (max_devs && unit_id >= max_devs) {
931 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
932 goto fail;
933 }
934
935 if (drive_get(type, bus_id, unit_id) != NULL) {
936 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
937 bus_id, unit_id, index);
938 goto fail;
939 }
940
941 /* no id supplied -> create one */
942 if (qemu_opts_id(all_opts) == NULL) {
943 char *new_id;
944 const char *mediastr = "";
945 if (type == IF_IDE || type == IF_SCSI) {
946 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
947 }
948 if (max_devs) {
949 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
950 mediastr, unit_id);
951 } else {
952 new_id = g_strdup_printf("%s%s%i", if_name[type],
953 mediastr, unit_id);
954 }
955 qdict_put_str(bs_opts, "id", new_id);
956 g_free(new_id);
957 }
958
959 /* Add virtio block device */
960 if (type == IF_VIRTIO) {
961 QemuOpts *devopts;
962 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
963 &error_abort);
964 qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort);
965 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
966 &error_abort);
967 }
968
969 filename = qemu_opt_get(legacy_opts, "file");
970
971 /* Check werror/rerror compatibility with if=... */
972 werror = qemu_opt_get(legacy_opts, "werror");
973 if (werror != NULL) {
974 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
975 type != IF_NONE) {
976 error_setg(errp, "werror is not supported by this bus type");
977 goto fail;
978 }
979 qdict_put_str(bs_opts, "werror", werror);
980 }
981
982 rerror = qemu_opt_get(legacy_opts, "rerror");
983 if (rerror != NULL) {
984 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
985 type != IF_NONE) {
986 error_setg(errp, "rerror is not supported by this bus type");
987 goto fail;
988 }
989 qdict_put_str(bs_opts, "rerror", rerror);
990 }
991
992 /* Actual block device init: Functionality shared with blockdev-add */
993 blk = blockdev_init(filename, bs_opts, errp);
994 bs_opts = NULL;
995 if (!blk) {
996 goto fail;
997 }
998
999 /* Create legacy DriveInfo */
1000 dinfo = g_malloc0(sizeof(*dinfo));
1001 dinfo->opts = all_opts;
1002
1003 dinfo->type = type;
1004 dinfo->bus = bus_id;
1005 dinfo->unit = unit_id;
1006
1007 blk_set_legacy_dinfo(blk, dinfo);
1008
1009 switch(type) {
1010 case IF_IDE:
1011 case IF_SCSI:
1012 case IF_XEN:
1013 case IF_NONE:
1014 dinfo->media_cd = media == MEDIA_CDROM;
1015 break;
1016 default:
1017 break;
1018 }
1019
1020 fail:
1021 qemu_opts_del(legacy_opts);
1022 qobject_unref(bs_opts);
1023 return dinfo;
1024 }
1025
1026 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1027 {
1028 BlockDriverState *bs;
1029
1030 bs = bdrv_lookup_bs(name, name, errp);
1031 if (bs == NULL) {
1032 return NULL;
1033 }
1034
1035 if (!bdrv_is_root_node(bs)) {
1036 error_setg(errp, "Need a root block node");
1037 return NULL;
1038 }
1039
1040 if (!bdrv_is_inserted(bs)) {
1041 error_setg(errp, "Device has no medium");
1042 return NULL;
1043 }
1044
1045 return bs;
1046 }
1047
1048 static void blockdev_do_action(TransactionAction *action, Error **errp)
1049 {
1050 TransactionActionList list;
1051
1052 list.value = action;
1053 list.next = NULL;
1054 qmp_transaction(&list, false, NULL, errp);
1055 }
1056
1057 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1058 bool has_node_name, const char *node_name,
1059 const char *snapshot_file,
1060 bool has_snapshot_node_name,
1061 const char *snapshot_node_name,
1062 bool has_format, const char *format,
1063 bool has_mode, NewImageMode mode, Error **errp)
1064 {
1065 BlockdevSnapshotSync snapshot = {
1066 .has_device = has_device,
1067 .device = (char *) device,
1068 .has_node_name = has_node_name,
1069 .node_name = (char *) node_name,
1070 .snapshot_file = (char *) snapshot_file,
1071 .has_snapshot_node_name = has_snapshot_node_name,
1072 .snapshot_node_name = (char *) snapshot_node_name,
1073 .has_format = has_format,
1074 .format = (char *) format,
1075 .has_mode = has_mode,
1076 .mode = mode,
1077 };
1078 TransactionAction action = {
1079 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1080 .u.blockdev_snapshot_sync.data = &snapshot,
1081 };
1082 blockdev_do_action(&action, errp);
1083 }
1084
1085 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1086 Error **errp)
1087 {
1088 BlockdevSnapshot snapshot_data = {
1089 .node = (char *) node,
1090 .overlay = (char *) overlay
1091 };
1092 TransactionAction action = {
1093 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1094 .u.blockdev_snapshot.data = &snapshot_data,
1095 };
1096 blockdev_do_action(&action, errp);
1097 }
1098
1099 void qmp_blockdev_snapshot_internal_sync(const char *device,
1100 const char *name,
1101 Error **errp)
1102 {
1103 BlockdevSnapshotInternal snapshot = {
1104 .device = (char *) device,
1105 .name = (char *) name
1106 };
1107 TransactionAction action = {
1108 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1109 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1110 };
1111 blockdev_do_action(&action, errp);
1112 }
1113
1114 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1115 bool has_id,
1116 const char *id,
1117 bool has_name,
1118 const char *name,
1119 Error **errp)
1120 {
1121 BlockDriverState *bs;
1122 AioContext *aio_context;
1123 QEMUSnapshotInfo sn;
1124 Error *local_err = NULL;
1125 SnapshotInfo *info = NULL;
1126 int ret;
1127
1128 bs = qmp_get_root_bs(device, errp);
1129 if (!bs) {
1130 return NULL;
1131 }
1132 aio_context = bdrv_get_aio_context(bs);
1133 aio_context_acquire(aio_context);
1134
1135 if (!has_id) {
1136 id = NULL;
1137 }
1138
1139 if (!has_name) {
1140 name = NULL;
1141 }
1142
1143 if (!id && !name) {
1144 error_setg(errp, "Name or id must be provided");
1145 goto out_aio_context;
1146 }
1147
1148 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1149 goto out_aio_context;
1150 }
1151
1152 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1153 if (local_err) {
1154 error_propagate(errp, local_err);
1155 goto out_aio_context;
1156 }
1157 if (!ret) {
1158 error_setg(errp,
1159 "Snapshot with id '%s' and name '%s' does not exist on "
1160 "device '%s'",
1161 STR_OR_NULL(id), STR_OR_NULL(name), device);
1162 goto out_aio_context;
1163 }
1164
1165 bdrv_snapshot_delete(bs, id, name, &local_err);
1166 if (local_err) {
1167 error_propagate(errp, local_err);
1168 goto out_aio_context;
1169 }
1170
1171 aio_context_release(aio_context);
1172
1173 info = g_new0(SnapshotInfo, 1);
1174 info->id = g_strdup(sn.id_str);
1175 info->name = g_strdup(sn.name);
1176 info->date_nsec = sn.date_nsec;
1177 info->date_sec = sn.date_sec;
1178 info->vm_state_size = sn.vm_state_size;
1179 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1180 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1181 if (sn.icount != -1ULL) {
1182 info->icount = sn.icount;
1183 info->has_icount = true;
1184 }
1185
1186 return info;
1187
1188 out_aio_context:
1189 aio_context_release(aio_context);
1190 return NULL;
1191 }
1192
1193 /* New and old BlockDriverState structs for atomic group operations */
1194
1195 typedef struct BlkActionState BlkActionState;
1196
1197 /**
1198 * BlkActionOps:
1199 * Table of operations that define an Action.
1200 *
1201 * @instance_size: Size of state struct, in bytes.
1202 * @prepare: Prepare the work, must NOT be NULL.
1203 * @commit: Commit the changes, can be NULL.
1204 * @abort: Abort the changes on fail, can be NULL.
1205 * @clean: Clean up resources after all transaction actions have called
1206 * commit() or abort(). Can be NULL.
1207 *
1208 * Only prepare() may fail. In a single transaction, only one of commit() or
1209 * abort() will be called. clean() will always be called if it is present.
1210 */
1211 typedef struct BlkActionOps {
1212 size_t instance_size;
1213 void (*prepare)(BlkActionState *common, Error **errp);
1214 void (*commit)(BlkActionState *common);
1215 void (*abort)(BlkActionState *common);
1216 void (*clean)(BlkActionState *common);
1217 } BlkActionOps;
1218
1219 /**
1220 * BlkActionState:
1221 * Describes one Action's state within a Transaction.
1222 *
1223 * @action: QAPI-defined enum identifying which Action to perform.
1224 * @ops: Table of ActionOps this Action can perform.
1225 * @block_job_txn: Transaction which this action belongs to.
1226 * @entry: List membership for all Actions in this Transaction.
1227 *
1228 * This structure must be arranged as first member in a subclassed type,
1229 * assuming that the compiler will also arrange it to the same offsets as the
1230 * base class.
1231 */
1232 struct BlkActionState {
1233 TransactionAction *action;
1234 const BlkActionOps *ops;
1235 JobTxn *block_job_txn;
1236 TransactionProperties *txn_props;
1237 QTAILQ_ENTRY(BlkActionState) entry;
1238 };
1239
1240 /* internal snapshot private data */
1241 typedef struct InternalSnapshotState {
1242 BlkActionState common;
1243 BlockDriverState *bs;
1244 QEMUSnapshotInfo sn;
1245 bool created;
1246 } InternalSnapshotState;
1247
1248
1249 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1250 {
1251 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1252 error_setg(errp,
1253 "Action '%s' does not support Transaction property "
1254 "completion-mode = %s",
1255 TransactionActionKind_str(s->action->type),
1256 ActionCompletionMode_str(s->txn_props->completion_mode));
1257 return -1;
1258 }
1259 return 0;
1260 }
1261
1262 static void internal_snapshot_prepare(BlkActionState *common,
1263 Error **errp)
1264 {
1265 Error *local_err = NULL;
1266 const char *device;
1267 const char *name;
1268 BlockDriverState *bs;
1269 QEMUSnapshotInfo old_sn, *sn;
1270 bool ret;
1271 qemu_timeval tv;
1272 BlockdevSnapshotInternal *internal;
1273 InternalSnapshotState *state;
1274 AioContext *aio_context;
1275 int ret1;
1276
1277 g_assert(common->action->type ==
1278 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1279 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1280 state = DO_UPCAST(InternalSnapshotState, common, common);
1281
1282 /* 1. parse input */
1283 device = internal->device;
1284 name = internal->name;
1285
1286 /* 2. check for validation */
1287 if (action_check_completion_mode(common, errp) < 0) {
1288 return;
1289 }
1290
1291 bs = qmp_get_root_bs(device, errp);
1292 if (!bs) {
1293 return;
1294 }
1295
1296 aio_context = bdrv_get_aio_context(bs);
1297 aio_context_acquire(aio_context);
1298
1299 state->bs = bs;
1300
1301 /* Paired with .clean() */
1302 bdrv_drained_begin(bs);
1303
1304 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1305 goto out;
1306 }
1307
1308 if (bdrv_is_read_only(bs)) {
1309 error_setg(errp, "Device '%s' is read only", device);
1310 goto out;
1311 }
1312
1313 if (!bdrv_can_snapshot(bs)) {
1314 error_setg(errp, "Block format '%s' used by device '%s' "
1315 "does not support internal snapshots",
1316 bs->drv->format_name, device);
1317 goto out;
1318 }
1319
1320 if (!strlen(name)) {
1321 error_setg(errp, "Name is empty");
1322 goto out;
1323 }
1324
1325 /* check whether a snapshot with name exist */
1326 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1327 &local_err);
1328 if (local_err) {
1329 error_propagate(errp, local_err);
1330 goto out;
1331 } else if (ret) {
1332 error_setg(errp,
1333 "Snapshot with name '%s' already exists on device '%s'",
1334 name, device);
1335 goto out;
1336 }
1337
1338 /* 3. take the snapshot */
1339 sn = &state->sn;
1340 pstrcpy(sn->name, sizeof(sn->name), name);
1341 qemu_gettimeofday(&tv);
1342 sn->date_sec = tv.tv_sec;
1343 sn->date_nsec = tv.tv_usec * 1000;
1344 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1345 if (replay_mode != REPLAY_MODE_NONE) {
1346 sn->icount = replay_get_current_icount();
1347 } else {
1348 sn->icount = -1ULL;
1349 }
1350
1351 ret1 = bdrv_snapshot_create(bs, sn);
1352 if (ret1 < 0) {
1353 error_setg_errno(errp, -ret1,
1354 "Failed to create snapshot '%s' on device '%s'",
1355 name, device);
1356 goto out;
1357 }
1358
1359 /* 4. succeed, mark a snapshot is created */
1360 state->created = true;
1361
1362 out:
1363 aio_context_release(aio_context);
1364 }
1365
1366 static void internal_snapshot_abort(BlkActionState *common)
1367 {
1368 InternalSnapshotState *state =
1369 DO_UPCAST(InternalSnapshotState, common, common);
1370 BlockDriverState *bs = state->bs;
1371 QEMUSnapshotInfo *sn = &state->sn;
1372 AioContext *aio_context;
1373 Error *local_error = NULL;
1374
1375 if (!state->created) {
1376 return;
1377 }
1378
1379 aio_context = bdrv_get_aio_context(state->bs);
1380 aio_context_acquire(aio_context);
1381
1382 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1383 error_reportf_err(local_error,
1384 "Failed to delete snapshot with id '%s' and "
1385 "name '%s' on device '%s' in abort: ",
1386 sn->id_str, sn->name,
1387 bdrv_get_device_name(bs));
1388 }
1389
1390 aio_context_release(aio_context);
1391 }
1392
1393 static void internal_snapshot_clean(BlkActionState *common)
1394 {
1395 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1396 common, common);
1397 AioContext *aio_context;
1398
1399 if (!state->bs) {
1400 return;
1401 }
1402
1403 aio_context = bdrv_get_aio_context(state->bs);
1404 aio_context_acquire(aio_context);
1405
1406 bdrv_drained_end(state->bs);
1407
1408 aio_context_release(aio_context);
1409 }
1410
1411 /* external snapshot private data */
1412 typedef struct ExternalSnapshotState {
1413 BlkActionState common;
1414 BlockDriverState *old_bs;
1415 BlockDriverState *new_bs;
1416 bool overlay_appended;
1417 } ExternalSnapshotState;
1418
1419 static void external_snapshot_prepare(BlkActionState *common,
1420 Error **errp)
1421 {
1422 int ret;
1423 int flags = 0;
1424 QDict *options = NULL;
1425 Error *local_err = NULL;
1426 /* Device and node name of the image to generate the snapshot from */
1427 const char *device;
1428 const char *node_name;
1429 /* Reference to the new image (for 'blockdev-snapshot') */
1430 const char *snapshot_ref;
1431 /* File name of the new image (for 'blockdev-snapshot-sync') */
1432 const char *new_image_file;
1433 ExternalSnapshotState *state =
1434 DO_UPCAST(ExternalSnapshotState, common, common);
1435 TransactionAction *action = common->action;
1436 AioContext *aio_context;
1437 uint64_t perm, shared;
1438
1439 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1440 * purpose but a different set of parameters */
1441 switch (action->type) {
1442 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1443 {
1444 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1445 device = s->node;
1446 node_name = s->node;
1447 new_image_file = NULL;
1448 snapshot_ref = s->overlay;
1449 }
1450 break;
1451 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1452 {
1453 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1454 device = s->has_device ? s->device : NULL;
1455 node_name = s->has_node_name ? s->node_name : NULL;
1456 new_image_file = s->snapshot_file;
1457 snapshot_ref = NULL;
1458 }
1459 break;
1460 default:
1461 g_assert_not_reached();
1462 }
1463
1464 /* start processing */
1465 if (action_check_completion_mode(common, errp) < 0) {
1466 return;
1467 }
1468
1469 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1470 if (!state->old_bs) {
1471 return;
1472 }
1473
1474 aio_context = bdrv_get_aio_context(state->old_bs);
1475 aio_context_acquire(aio_context);
1476
1477 /* Paired with .clean() */
1478 bdrv_drained_begin(state->old_bs);
1479
1480 if (!bdrv_is_inserted(state->old_bs)) {
1481 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1482 goto out;
1483 }
1484
1485 if (bdrv_op_is_blocked(state->old_bs,
1486 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1487 goto out;
1488 }
1489
1490 if (!bdrv_is_read_only(state->old_bs)) {
1491 if (bdrv_flush(state->old_bs)) {
1492 error_setg(errp, QERR_IO_ERROR);
1493 goto out;
1494 }
1495 }
1496
1497 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1498 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1499 const char *format = s->has_format ? s->format : "qcow2";
1500 enum NewImageMode mode;
1501 const char *snapshot_node_name =
1502 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1503
1504 if (node_name && !snapshot_node_name) {
1505 error_setg(errp, "New overlay node-name missing");
1506 goto out;
1507 }
1508
1509 if (snapshot_node_name &&
1510 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1511 error_setg(errp, "New overlay node-name already in use");
1512 goto out;
1513 }
1514
1515 flags = state->old_bs->open_flags;
1516 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1517 flags |= BDRV_O_NO_BACKING;
1518
1519 /* create new image w/backing file */
1520 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1521 if (mode != NEW_IMAGE_MODE_EXISTING) {
1522 int64_t size = bdrv_getlength(state->old_bs);
1523 if (size < 0) {
1524 error_setg_errno(errp, -size, "bdrv_getlength failed");
1525 goto out;
1526 }
1527 bdrv_refresh_filename(state->old_bs);
1528 bdrv_img_create(new_image_file, format,
1529 state->old_bs->filename,
1530 state->old_bs->drv->format_name,
1531 NULL, size, flags, false, &local_err);
1532 if (local_err) {
1533 error_propagate(errp, local_err);
1534 goto out;
1535 }
1536 }
1537
1538 options = qdict_new();
1539 if (snapshot_node_name) {
1540 qdict_put_str(options, "node-name", snapshot_node_name);
1541 }
1542 qdict_put_str(options, "driver", format);
1543 }
1544
1545 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1546 errp);
1547 /* We will manually add the backing_hd field to the bs later */
1548 if (!state->new_bs) {
1549 goto out;
1550 }
1551
1552 /*
1553 * Allow attaching a backing file to an overlay that's already in use only
1554 * if the parents don't assume that they are already seeing a valid image.
1555 * (Specifically, allow it as a mirror target, which is write-only access.)
1556 */
1557 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared);
1558 if (perm & BLK_PERM_CONSISTENT_READ) {
1559 error_setg(errp, "The overlay is already in use");
1560 goto out;
1561 }
1562
1563 if (state->new_bs->drv->is_filter) {
1564 error_setg(errp, "Filters cannot be used as overlays");
1565 goto out;
1566 }
1567
1568 if (bdrv_cow_child(state->new_bs)) {
1569 error_setg(errp, "The overlay already has a backing image");
1570 goto out;
1571 }
1572
1573 if (!state->new_bs->drv->supports_backing) {
1574 error_setg(errp, "The overlay does not support backing images");
1575 goto out;
1576 }
1577
1578 ret = bdrv_append(state->new_bs, state->old_bs, errp);
1579 if (ret < 0) {
1580 goto out;
1581 }
1582 state->overlay_appended = true;
1583
1584 out:
1585 aio_context_release(aio_context);
1586 }
1587
1588 static void external_snapshot_commit(BlkActionState *common)
1589 {
1590 ExternalSnapshotState *state =
1591 DO_UPCAST(ExternalSnapshotState, common, common);
1592 AioContext *aio_context;
1593
1594 aio_context = bdrv_get_aio_context(state->old_bs);
1595 aio_context_acquire(aio_context);
1596
1597 /* We don't need (or want) to use the transactional
1598 * bdrv_reopen_multiple() across all the entries at once, because we
1599 * don't want to abort all of them if one of them fails the reopen */
1600 if (!qatomic_read(&state->old_bs->copy_on_read)) {
1601 bdrv_reopen_set_read_only(state->old_bs, true, NULL);
1602 }
1603
1604 aio_context_release(aio_context);
1605 }
1606
1607 static void external_snapshot_abort(BlkActionState *common)
1608 {
1609 ExternalSnapshotState *state =
1610 DO_UPCAST(ExternalSnapshotState, common, common);
1611 if (state->new_bs) {
1612 if (state->overlay_appended) {
1613 AioContext *aio_context;
1614 AioContext *tmp_context;
1615 int ret;
1616
1617 aio_context = bdrv_get_aio_context(state->old_bs);
1618 aio_context_acquire(aio_context);
1619
1620 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1621 close state->old_bs; we need it */
1622 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1623
1624 /*
1625 * The call to bdrv_set_backing_hd() above returns state->old_bs to
1626 * the main AioContext. As we're still going to be using it, return
1627 * it to the AioContext it was before.
1628 */
1629 tmp_context = bdrv_get_aio_context(state->old_bs);
1630 if (aio_context != tmp_context) {
1631 aio_context_release(aio_context);
1632 aio_context_acquire(tmp_context);
1633
1634 ret = bdrv_try_set_aio_context(state->old_bs,
1635 aio_context, NULL);
1636 assert(ret == 0);
1637
1638 aio_context_release(tmp_context);
1639 aio_context_acquire(aio_context);
1640 }
1641
1642 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1643 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1644
1645 aio_context_release(aio_context);
1646 }
1647 }
1648 }
1649
1650 static void external_snapshot_clean(BlkActionState *common)
1651 {
1652 ExternalSnapshotState *state =
1653 DO_UPCAST(ExternalSnapshotState, common, common);
1654 AioContext *aio_context;
1655
1656 if (!state->old_bs) {
1657 return;
1658 }
1659
1660 aio_context = bdrv_get_aio_context(state->old_bs);
1661 aio_context_acquire(aio_context);
1662
1663 bdrv_drained_end(state->old_bs);
1664 bdrv_unref(state->new_bs);
1665
1666 aio_context_release(aio_context);
1667 }
1668
1669 typedef struct DriveBackupState {
1670 BlkActionState common;
1671 BlockDriverState *bs;
1672 BlockJob *job;
1673 } DriveBackupState;
1674
1675 static BlockJob *do_backup_common(BackupCommon *backup,
1676 BlockDriverState *bs,
1677 BlockDriverState *target_bs,
1678 AioContext *aio_context,
1679 JobTxn *txn, Error **errp);
1680
1681 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1682 {
1683 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1684 DriveBackup *backup;
1685 BlockDriverState *bs;
1686 BlockDriverState *target_bs;
1687 BlockDriverState *source = NULL;
1688 AioContext *aio_context;
1689 AioContext *old_context;
1690 QDict *options;
1691 Error *local_err = NULL;
1692 int flags;
1693 int64_t size;
1694 bool set_backing_hd = false;
1695 int ret;
1696
1697 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1698 backup = common->action->u.drive_backup.data;
1699
1700 if (!backup->has_mode) {
1701 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1702 }
1703
1704 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1705 if (!bs) {
1706 return;
1707 }
1708
1709 if (!bs->drv) {
1710 error_setg(errp, "Device has no medium");
1711 return;
1712 }
1713
1714 aio_context = bdrv_get_aio_context(bs);
1715 aio_context_acquire(aio_context);
1716
1717 state->bs = bs;
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->job = do_backup_common(qapi_DriveBackup_base(backup),
1818 bs, target_bs, aio_context,
1819 common->block_job_txn, errp);
1820
1821 unref:
1822 bdrv_unref(target_bs);
1823 out:
1824 aio_context_release(aio_context);
1825 }
1826
1827 static void drive_backup_commit(BlkActionState *common)
1828 {
1829 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1830 AioContext *aio_context;
1831
1832 aio_context = bdrv_get_aio_context(state->bs);
1833 aio_context_acquire(aio_context);
1834
1835 assert(state->job);
1836 job_start(&state->job->job);
1837
1838 aio_context_release(aio_context);
1839 }
1840
1841 static void drive_backup_abort(BlkActionState *common)
1842 {
1843 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1844
1845 if (state->job) {
1846 AioContext *aio_context;
1847
1848 aio_context = bdrv_get_aio_context(state->bs);
1849 aio_context_acquire(aio_context);
1850
1851 job_cancel_sync(&state->job->job);
1852
1853 aio_context_release(aio_context);
1854 }
1855 }
1856
1857 static void drive_backup_clean(BlkActionState *common)
1858 {
1859 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1860 AioContext *aio_context;
1861
1862 if (!state->bs) {
1863 return;
1864 }
1865
1866 aio_context = bdrv_get_aio_context(state->bs);
1867 aio_context_acquire(aio_context);
1868
1869 bdrv_drained_end(state->bs);
1870
1871 aio_context_release(aio_context);
1872 }
1873
1874 typedef struct BlockdevBackupState {
1875 BlkActionState common;
1876 BlockDriverState *bs;
1877 BlockJob *job;
1878 } BlockdevBackupState;
1879
1880 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1881 {
1882 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1883 BlockdevBackup *backup;
1884 BlockDriverState *bs;
1885 BlockDriverState *target_bs;
1886 AioContext *aio_context;
1887 AioContext *old_context;
1888 int ret;
1889
1890 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1891 backup = common->action->u.blockdev_backup.data;
1892
1893 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1894 if (!bs) {
1895 return;
1896 }
1897
1898 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
1899 if (!target_bs) {
1900 return;
1901 }
1902
1903 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
1904 aio_context = bdrv_get_aio_context(bs);
1905 old_context = bdrv_get_aio_context(target_bs);
1906 aio_context_acquire(old_context);
1907
1908 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
1909 if (ret < 0) {
1910 aio_context_release(old_context);
1911 return;
1912 }
1913
1914 aio_context_release(old_context);
1915 aio_context_acquire(aio_context);
1916 state->bs = bs;
1917
1918 /* Paired with .clean() */
1919 bdrv_drained_begin(state->bs);
1920
1921 state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
1922 bs, target_bs, aio_context,
1923 common->block_job_txn, errp);
1924
1925 aio_context_release(aio_context);
1926 }
1927
1928 static void blockdev_backup_commit(BlkActionState *common)
1929 {
1930 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1931 AioContext *aio_context;
1932
1933 aio_context = bdrv_get_aio_context(state->bs);
1934 aio_context_acquire(aio_context);
1935
1936 assert(state->job);
1937 job_start(&state->job->job);
1938
1939 aio_context_release(aio_context);
1940 }
1941
1942 static void blockdev_backup_abort(BlkActionState *common)
1943 {
1944 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1945
1946 if (state->job) {
1947 AioContext *aio_context;
1948
1949 aio_context = bdrv_get_aio_context(state->bs);
1950 aio_context_acquire(aio_context);
1951
1952 job_cancel_sync(&state->job->job);
1953
1954 aio_context_release(aio_context);
1955 }
1956 }
1957
1958 static void blockdev_backup_clean(BlkActionState *common)
1959 {
1960 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1961 AioContext *aio_context;
1962
1963 if (!state->bs) {
1964 return;
1965 }
1966
1967 aio_context = bdrv_get_aio_context(state->bs);
1968 aio_context_acquire(aio_context);
1969
1970 bdrv_drained_end(state->bs);
1971
1972 aio_context_release(aio_context);
1973 }
1974
1975 typedef struct BlockDirtyBitmapState {
1976 BlkActionState common;
1977 BdrvDirtyBitmap *bitmap;
1978 BlockDriverState *bs;
1979 HBitmap *backup;
1980 bool prepared;
1981 bool was_enabled;
1982 } BlockDirtyBitmapState;
1983
1984 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
1985 Error **errp)
1986 {
1987 Error *local_err = NULL;
1988 BlockDirtyBitmapAdd *action;
1989 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1990 common, common);
1991
1992 if (action_check_completion_mode(common, errp) < 0) {
1993 return;
1994 }
1995
1996 action = common->action->u.block_dirty_bitmap_add.data;
1997 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1998 qmp_block_dirty_bitmap_add(action->node, action->name,
1999 action->has_granularity, action->granularity,
2000 action->has_persistent, action->persistent,
2001 action->has_disabled, action->disabled,
2002 &local_err);
2003
2004 if (!local_err) {
2005 state->prepared = true;
2006 } else {
2007 error_propagate(errp, local_err);
2008 }
2009 }
2010
2011 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2012 {
2013 BlockDirtyBitmapAdd *action;
2014 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2015 common, common);
2016
2017 action = common->action->u.block_dirty_bitmap_add.data;
2018 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2019 * then the node reference and bitmap name must have been valid.
2020 */
2021 if (state->prepared) {
2022 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2023 }
2024 }
2025
2026 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2027 Error **errp)
2028 {
2029 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2030 common, common);
2031 BlockDirtyBitmap *action;
2032
2033 if (action_check_completion_mode(common, errp) < 0) {
2034 return;
2035 }
2036
2037 action = common->action->u.block_dirty_bitmap_clear.data;
2038 state->bitmap = block_dirty_bitmap_lookup(action->node,
2039 action->name,
2040 &state->bs,
2041 errp);
2042 if (!state->bitmap) {
2043 return;
2044 }
2045
2046 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
2047 return;
2048 }
2049
2050 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2051 }
2052
2053 static void block_dirty_bitmap_restore(BlkActionState *common)
2054 {
2055 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2056 common, common);
2057
2058 if (state->backup) {
2059 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
2060 }
2061 }
2062
2063 static void block_dirty_bitmap_free_backup(BlkActionState *common)
2064 {
2065 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2066 common, common);
2067
2068 hbitmap_free(state->backup);
2069 }
2070
2071 static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
2072 Error **errp)
2073 {
2074 BlockDirtyBitmap *action;
2075 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2076 common, common);
2077
2078 if (action_check_completion_mode(common, errp) < 0) {
2079 return;
2080 }
2081
2082 action = common->action->u.block_dirty_bitmap_enable.data;
2083 state->bitmap = block_dirty_bitmap_lookup(action->node,
2084 action->name,
2085 NULL,
2086 errp);
2087 if (!state->bitmap) {
2088 return;
2089 }
2090
2091 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2092 return;
2093 }
2094
2095 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2096 bdrv_enable_dirty_bitmap(state->bitmap);
2097 }
2098
2099 static void block_dirty_bitmap_enable_abort(BlkActionState *common)
2100 {
2101 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2102 common, common);
2103
2104 if (!state->was_enabled) {
2105 bdrv_disable_dirty_bitmap(state->bitmap);
2106 }
2107 }
2108
2109 static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
2110 Error **errp)
2111 {
2112 BlockDirtyBitmap *action;
2113 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2114 common, common);
2115
2116 if (action_check_completion_mode(common, errp) < 0) {
2117 return;
2118 }
2119
2120 action = common->action->u.block_dirty_bitmap_disable.data;
2121 state->bitmap = block_dirty_bitmap_lookup(action->node,
2122 action->name,
2123 NULL,
2124 errp);
2125 if (!state->bitmap) {
2126 return;
2127 }
2128
2129 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2130 return;
2131 }
2132
2133 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2134 bdrv_disable_dirty_bitmap(state->bitmap);
2135 }
2136
2137 static void block_dirty_bitmap_disable_abort(BlkActionState *common)
2138 {
2139 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2140 common, common);
2141
2142 if (state->was_enabled) {
2143 bdrv_enable_dirty_bitmap(state->bitmap);
2144 }
2145 }
2146
2147 static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
2148 Error **errp)
2149 {
2150 BlockDirtyBitmapMerge *action;
2151 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2152 common, common);
2153
2154 if (action_check_completion_mode(common, errp) < 0) {
2155 return;
2156 }
2157
2158 action = common->action->u.block_dirty_bitmap_merge.data;
2159
2160 state->bitmap = block_dirty_bitmap_merge(action->node, action->target,
2161 action->bitmaps, &state->backup,
2162 errp);
2163 }
2164
2165 static void block_dirty_bitmap_remove_prepare(BlkActionState *common,
2166 Error **errp)
2167 {
2168 BlockDirtyBitmap *action;
2169 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2170 common, common);
2171
2172 if (action_check_completion_mode(common, errp) < 0) {
2173 return;
2174 }
2175
2176 action = common->action->u.block_dirty_bitmap_remove.data;
2177
2178 state->bitmap = block_dirty_bitmap_remove(action->node, action->name,
2179 false, &state->bs, errp);
2180 if (state->bitmap) {
2181 bdrv_dirty_bitmap_skip_store(state->bitmap, true);
2182 bdrv_dirty_bitmap_set_busy(state->bitmap, true);
2183 }
2184 }
2185
2186 static void block_dirty_bitmap_remove_abort(BlkActionState *common)
2187 {
2188 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2189 common, common);
2190
2191 if (state->bitmap) {
2192 bdrv_dirty_bitmap_skip_store(state->bitmap, false);
2193 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2194 }
2195 }
2196
2197 static void block_dirty_bitmap_remove_commit(BlkActionState *common)
2198 {
2199 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2200 common, common);
2201
2202 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2203 bdrv_release_dirty_bitmap(state->bitmap);
2204 }
2205
2206 static void abort_prepare(BlkActionState *common, Error **errp)
2207 {
2208 error_setg(errp, "Transaction aborted using Abort action");
2209 }
2210
2211 static void abort_commit(BlkActionState *common)
2212 {
2213 g_assert_not_reached(); /* this action never succeeds */
2214 }
2215
2216 static const BlkActionOps actions[] = {
2217 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2218 .instance_size = sizeof(ExternalSnapshotState),
2219 .prepare = external_snapshot_prepare,
2220 .commit = external_snapshot_commit,
2221 .abort = external_snapshot_abort,
2222 .clean = external_snapshot_clean,
2223 },
2224 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2225 .instance_size = sizeof(ExternalSnapshotState),
2226 .prepare = external_snapshot_prepare,
2227 .commit = external_snapshot_commit,
2228 .abort = external_snapshot_abort,
2229 .clean = external_snapshot_clean,
2230 },
2231 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2232 .instance_size = sizeof(DriveBackupState),
2233 .prepare = drive_backup_prepare,
2234 .commit = drive_backup_commit,
2235 .abort = drive_backup_abort,
2236 .clean = drive_backup_clean,
2237 },
2238 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2239 .instance_size = sizeof(BlockdevBackupState),
2240 .prepare = blockdev_backup_prepare,
2241 .commit = blockdev_backup_commit,
2242 .abort = blockdev_backup_abort,
2243 .clean = blockdev_backup_clean,
2244 },
2245 [TRANSACTION_ACTION_KIND_ABORT] = {
2246 .instance_size = sizeof(BlkActionState),
2247 .prepare = abort_prepare,
2248 .commit = abort_commit,
2249 },
2250 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2251 .instance_size = sizeof(InternalSnapshotState),
2252 .prepare = internal_snapshot_prepare,
2253 .abort = internal_snapshot_abort,
2254 .clean = internal_snapshot_clean,
2255 },
2256 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2257 .instance_size = sizeof(BlockDirtyBitmapState),
2258 .prepare = block_dirty_bitmap_add_prepare,
2259 .abort = block_dirty_bitmap_add_abort,
2260 },
2261 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2262 .instance_size = sizeof(BlockDirtyBitmapState),
2263 .prepare = block_dirty_bitmap_clear_prepare,
2264 .commit = block_dirty_bitmap_free_backup,
2265 .abort = block_dirty_bitmap_restore,
2266 },
2267 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = {
2268 .instance_size = sizeof(BlockDirtyBitmapState),
2269 .prepare = block_dirty_bitmap_enable_prepare,
2270 .abort = block_dirty_bitmap_enable_abort,
2271 },
2272 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = {
2273 .instance_size = sizeof(BlockDirtyBitmapState),
2274 .prepare = block_dirty_bitmap_disable_prepare,
2275 .abort = block_dirty_bitmap_disable_abort,
2276 },
2277 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = {
2278 .instance_size = sizeof(BlockDirtyBitmapState),
2279 .prepare = block_dirty_bitmap_merge_prepare,
2280 .commit = block_dirty_bitmap_free_backup,
2281 .abort = block_dirty_bitmap_restore,
2282 },
2283 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE] = {
2284 .instance_size = sizeof(BlockDirtyBitmapState),
2285 .prepare = block_dirty_bitmap_remove_prepare,
2286 .commit = block_dirty_bitmap_remove_commit,
2287 .abort = block_dirty_bitmap_remove_abort,
2288 },
2289 /* Where are transactions for MIRROR, COMMIT and STREAM?
2290 * Although these blockjobs use transaction callbacks like the backup job,
2291 * these jobs do not necessarily adhere to transaction semantics.
2292 * These jobs may not fully undo all of their actions on abort, nor do they
2293 * necessarily work in transactions with more than one job in them.
2294 */
2295 };
2296
2297 /**
2298 * Allocate a TransactionProperties structure if necessary, and fill
2299 * that structure with desired defaults if they are unset.
2300 */
2301 static TransactionProperties *get_transaction_properties(
2302 TransactionProperties *props)
2303 {
2304 if (!props) {
2305 props = g_new0(TransactionProperties, 1);
2306 }
2307
2308 if (!props->has_completion_mode) {
2309 props->has_completion_mode = true;
2310 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2311 }
2312
2313 return props;
2314 }
2315
2316 /*
2317 * 'Atomic' group operations. The operations are performed as a set, and if
2318 * any fail then we roll back all operations in the group.
2319 */
2320 void qmp_transaction(TransactionActionList *dev_list,
2321 bool has_props,
2322 struct TransactionProperties *props,
2323 Error **errp)
2324 {
2325 TransactionActionList *dev_entry = dev_list;
2326 JobTxn *block_job_txn = NULL;
2327 BlkActionState *state, *next;
2328 Error *local_err = NULL;
2329
2330 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states;
2331 QTAILQ_INIT(&snap_bdrv_states);
2332
2333 /* Does this transaction get canceled as a group on failure?
2334 * If not, we don't really need to make a JobTxn.
2335 */
2336 props = get_transaction_properties(props);
2337 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2338 block_job_txn = job_txn_new();
2339 }
2340
2341 /* drain all i/o before any operations */
2342 bdrv_drain_all();
2343
2344 /* We don't do anything in this loop that commits us to the operations */
2345 while (NULL != dev_entry) {
2346 TransactionAction *dev_info = NULL;
2347 const BlkActionOps *ops;
2348
2349 dev_info = dev_entry->value;
2350 dev_entry = dev_entry->next;
2351
2352 assert(dev_info->type < ARRAY_SIZE(actions));
2353
2354 ops = &actions[dev_info->type];
2355 assert(ops->instance_size > 0);
2356
2357 state = g_malloc0(ops->instance_size);
2358 state->ops = ops;
2359 state->action = dev_info;
2360 state->block_job_txn = block_job_txn;
2361 state->txn_props = props;
2362 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2363
2364 state->ops->prepare(state, &local_err);
2365 if (local_err) {
2366 error_propagate(errp, local_err);
2367 goto delete_and_fail;
2368 }
2369 }
2370
2371 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) {
2372 if (state->ops->commit) {
2373 state->ops->commit(state);
2374 }
2375 }
2376
2377 /* success */
2378 goto exit;
2379
2380 delete_and_fail:
2381 /* failure, and it is all-or-none; roll back all operations */
2382 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) {
2383 if (state->ops->abort) {
2384 state->ops->abort(state);
2385 }
2386 }
2387 exit:
2388 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2389 if (state->ops->clean) {
2390 state->ops->clean(state);
2391 }
2392 g_free(state);
2393 }
2394 if (!has_props) {
2395 qapi_free_TransactionProperties(props);
2396 }
2397 job_txn_unref(block_job_txn);
2398 }
2399
2400 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2401 const char *name,
2402 Error **errp)
2403 {
2404 BdrvDirtyBitmap *bitmap;
2405 BlockDriverState *bs;
2406 BlockDirtyBitmapSha256 *ret = NULL;
2407 char *sha256;
2408
2409 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2410 if (!bitmap || !bs) {
2411 return NULL;
2412 }
2413
2414 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2415 if (sha256 == NULL) {
2416 return NULL;
2417 }
2418
2419 ret = g_new(BlockDirtyBitmapSha256, 1);
2420 ret->sha256 = sha256;
2421
2422 return ret;
2423 }
2424
2425 void coroutine_fn qmp_block_resize(bool has_device, const char *device,
2426 bool has_node_name, const char *node_name,
2427 int64_t size, Error **errp)
2428 {
2429 Error *local_err = NULL;
2430 BlockBackend *blk;
2431 BlockDriverState *bs;
2432 AioContext *old_ctx;
2433
2434 bs = bdrv_lookup_bs(has_device ? device : NULL,
2435 has_node_name ? node_name : NULL,
2436 &local_err);
2437 if (local_err) {
2438 error_propagate(errp, local_err);
2439 return;
2440 }
2441
2442 if (size < 0) {
2443 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2444 return;
2445 }
2446
2447 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2448 error_setg(errp, QERR_DEVICE_IN_USE, device);
2449 return;
2450 }
2451
2452 blk = blk_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp);
2453 if (!blk) {
2454 return;
2455 }
2456
2457 bdrv_co_lock(bs);
2458 bdrv_drained_begin(bs);
2459 bdrv_co_unlock(bs);
2460
2461 old_ctx = bdrv_co_enter(bs);
2462 blk_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
2463 bdrv_co_leave(bs, old_ctx);
2464
2465 bdrv_co_lock(bs);
2466 bdrv_drained_end(bs);
2467 blk_unref(blk);
2468 bdrv_co_unlock(bs);
2469 }
2470
2471 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
2472 bool has_base, const char *base,
2473 bool has_base_node, const char *base_node,
2474 bool has_backing_file, const char *backing_file,
2475 bool has_bottom, const char *bottom,
2476 bool has_speed, int64_t speed,
2477 bool has_on_error, BlockdevOnError on_error,
2478 bool has_filter_node_name, const char *filter_node_name,
2479 bool has_auto_finalize, bool auto_finalize,
2480 bool has_auto_dismiss, bool auto_dismiss,
2481 Error **errp)
2482 {
2483 BlockDriverState *bs, *iter, *iter_end;
2484 BlockDriverState *base_bs = NULL;
2485 BlockDriverState *bottom_bs = NULL;
2486 AioContext *aio_context;
2487 Error *local_err = NULL;
2488 int job_flags = JOB_DEFAULT;
2489
2490 if (has_base && has_base_node) {
2491 error_setg(errp, "'base' and 'base-node' cannot be specified "
2492 "at the same time");
2493 return;
2494 }
2495
2496 if (has_base && has_bottom) {
2497 error_setg(errp, "'base' and 'bottom' cannot be specified "
2498 "at the same time");
2499 return;
2500 }
2501
2502 if (has_bottom && has_base_node) {
2503 error_setg(errp, "'bottom' and 'base-node' cannot be specified "
2504 "at the same time");
2505 return;
2506 }
2507
2508 if (!has_on_error) {
2509 on_error = BLOCKDEV_ON_ERROR_REPORT;
2510 }
2511
2512 bs = bdrv_lookup_bs(device, device, errp);
2513 if (!bs) {
2514 return;
2515 }
2516
2517 aio_context = bdrv_get_aio_context(bs);
2518 aio_context_acquire(aio_context);
2519
2520 if (has_base) {
2521 base_bs = bdrv_find_backing_image(bs, base);
2522 if (base_bs == NULL) {
2523 error_setg(errp, "Can't find '%s' in the backing chain", base);
2524 goto out;
2525 }
2526 assert(bdrv_get_aio_context(base_bs) == aio_context);
2527 }
2528
2529 if (has_base_node) {
2530 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2531 if (!base_bs) {
2532 goto out;
2533 }
2534 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
2535 error_setg(errp, "Node '%s' is not a backing image of '%s'",
2536 base_node, device);
2537 goto out;
2538 }
2539 assert(bdrv_get_aio_context(base_bs) == aio_context);
2540 bdrv_refresh_filename(base_bs);
2541 }
2542
2543 if (has_bottom) {
2544 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp);
2545 if (!bottom_bs) {
2546 goto out;
2547 }
2548 if (!bottom_bs->drv) {
2549 error_setg(errp, "Node '%s' is not open", bottom);
2550 goto out;
2551 }
2552 if (bottom_bs->drv->is_filter) {
2553 error_setg(errp, "Node '%s' is a filter, use a non-filter node "
2554 "as 'bottom'", bottom);
2555 goto out;
2556 }
2557 if (!bdrv_chain_contains(bs, bottom_bs)) {
2558 error_setg(errp, "Node '%s' is not in a chain starting from '%s'",
2559 bottom, device);
2560 goto out;
2561 }
2562 assert(bdrv_get_aio_context(bottom_bs) == aio_context);
2563 }
2564
2565 /*
2566 * Check for op blockers in the whole chain between bs and base (or bottom)
2567 */
2568 iter_end = has_bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs;
2569 for (iter = bs; iter && iter != iter_end;
2570 iter = bdrv_filter_or_cow_bs(iter))
2571 {
2572 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
2573 goto out;
2574 }
2575 }
2576
2577 /* if we are streaming the entire chain, the result will have no backing
2578 * file, and specifying one is therefore an error */
2579 if (base_bs == NULL && has_backing_file) {
2580 error_setg(errp, "backing file specified, but streaming the "
2581 "entire chain");
2582 goto out;
2583 }
2584
2585 if (has_auto_finalize && !auto_finalize) {
2586 job_flags |= JOB_MANUAL_FINALIZE;
2587 }
2588 if (has_auto_dismiss && !auto_dismiss) {
2589 job_flags |= JOB_MANUAL_DISMISS;
2590 }
2591
2592 stream_start(has_job_id ? job_id : NULL, bs, base_bs, backing_file,
2593 bottom_bs, job_flags, has_speed ? speed : 0, on_error,
2594 filter_node_name, &local_err);
2595 if (local_err) {
2596 error_propagate(errp, local_err);
2597 goto out;
2598 }
2599
2600 trace_qmp_block_stream(bs);
2601
2602 out:
2603 aio_context_release(aio_context);
2604 }
2605
2606 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
2607 bool has_base_node, const char *base_node,
2608 bool has_base, const char *base,
2609 bool has_top_node, const char *top_node,
2610 bool has_top, const char *top,
2611 bool has_backing_file, const char *backing_file,
2612 bool has_speed, int64_t speed,
2613 bool has_on_error, BlockdevOnError on_error,
2614 bool has_filter_node_name, const char *filter_node_name,
2615 bool has_auto_finalize, bool auto_finalize,
2616 bool has_auto_dismiss, bool auto_dismiss,
2617 Error **errp)
2618 {
2619 BlockDriverState *bs;
2620 BlockDriverState *iter;
2621 BlockDriverState *base_bs, *top_bs;
2622 AioContext *aio_context;
2623 Error *local_err = NULL;
2624 int job_flags = JOB_DEFAULT;
2625 uint64_t top_perm, top_shared;
2626
2627 if (!has_speed) {
2628 speed = 0;
2629 }
2630 if (!has_on_error) {
2631 on_error = BLOCKDEV_ON_ERROR_REPORT;
2632 }
2633 if (!has_filter_node_name) {
2634 filter_node_name = NULL;
2635 }
2636 if (has_auto_finalize && !auto_finalize) {
2637 job_flags |= JOB_MANUAL_FINALIZE;
2638 }
2639 if (has_auto_dismiss && !auto_dismiss) {
2640 job_flags |= JOB_MANUAL_DISMISS;
2641 }
2642
2643 /* Important Note:
2644 * libvirt relies on the DeviceNotFound error class in order to probe for
2645 * live commit feature versions; for this to work, we must make sure to
2646 * perform the device lookup before any generic errors that may occur in a
2647 * scenario in which all optional arguments are omitted. */
2648 bs = qmp_get_root_bs(device, &local_err);
2649 if (!bs) {
2650 bs = bdrv_lookup_bs(device, device, NULL);
2651 if (!bs) {
2652 error_free(local_err);
2653 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2654 "Device '%s' not found", device);
2655 } else {
2656 error_propagate(errp, local_err);
2657 }
2658 return;
2659 }
2660
2661 aio_context = bdrv_get_aio_context(bs);
2662 aio_context_acquire(aio_context);
2663
2664 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2665 goto out;
2666 }
2667
2668 /* default top_bs is the active layer */
2669 top_bs = bs;
2670
2671 if (has_top_node && has_top) {
2672 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
2673 goto out;
2674 } else if (has_top_node) {
2675 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
2676 if (top_bs == NULL) {
2677 goto out;
2678 }
2679 if (!bdrv_chain_contains(bs, top_bs)) {
2680 error_setg(errp, "'%s' is not in this backing file chain",
2681 top_node);
2682 goto out;
2683 }
2684 } else if (has_top && top) {
2685 /* This strcmp() is just a shortcut, there is no need to
2686 * refresh @bs's filename. If it mismatches,
2687 * bdrv_find_backing_image() will do the refresh and may still
2688 * return @bs. */
2689 if (strcmp(bs->filename, top) != 0) {
2690 top_bs = bdrv_find_backing_image(bs, top);
2691 }
2692 }
2693
2694 if (top_bs == NULL) {
2695 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2696 goto out;
2697 }
2698
2699 assert(bdrv_get_aio_context(top_bs) == aio_context);
2700
2701 if (has_base_node && has_base) {
2702 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
2703 goto out;
2704 } else if (has_base_node) {
2705 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2706 if (base_bs == NULL) {
2707 goto out;
2708 }
2709 if (!bdrv_chain_contains(top_bs, base_bs)) {
2710 error_setg(errp, "'%s' is not in this backing file chain",
2711 base_node);
2712 goto out;
2713 }
2714 } else if (has_base && base) {
2715 base_bs = bdrv_find_backing_image(top_bs, base);
2716 if (base_bs == NULL) {
2717 error_setg(errp, "Can't find '%s' in the backing chain", base);
2718 goto out;
2719 }
2720 } else {
2721 base_bs = bdrv_find_base(top_bs);
2722 if (base_bs == NULL) {
2723 error_setg(errp, "There is no backimg image");
2724 goto out;
2725 }
2726 }
2727
2728 assert(bdrv_get_aio_context(base_bs) == aio_context);
2729
2730 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs);
2731 iter = bdrv_filter_or_cow_bs(iter))
2732 {
2733 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2734 goto out;
2735 }
2736 }
2737
2738 /* Do not allow attempts to commit an image into itself */
2739 if (top_bs == base_bs) {
2740 error_setg(errp, "cannot commit an image into itself");
2741 goto out;
2742 }
2743
2744 /*
2745 * Active commit is required if and only if someone has taken a
2746 * WRITE permission on the top node. Historically, we have always
2747 * used active commit for top nodes, so continue that practice
2748 * lest we possibly break clients that rely on this behavior, e.g.
2749 * to later attach this node to a writing parent.
2750 * (Active commit is never really wrong.)
2751 */
2752 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared);
2753 if (top_perm & BLK_PERM_WRITE ||
2754 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs))
2755 {
2756 if (has_backing_file) {
2757 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) {
2758 error_setg(errp, "'backing-file' specified,"
2759 " but 'top' is the active layer");
2760 } else {
2761 error_setg(errp, "'backing-file' specified, but 'top' has a "
2762 "writer on it");
2763 }
2764 goto out;
2765 }
2766 if (!has_job_id) {
2767 /*
2768 * Emulate here what block_job_create() does, because it
2769 * is possible that @bs != @top_bs (the block job should
2770 * be named after @bs, even if @top_bs is the actual
2771 * source)
2772 */
2773 job_id = bdrv_get_device_name(bs);
2774 }
2775 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error,
2776 filter_node_name, NULL, NULL, false, &local_err);
2777 } else {
2778 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
2779 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2780 goto out;
2781 }
2782 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags,
2783 speed, on_error, has_backing_file ? backing_file : NULL,
2784 filter_node_name, &local_err);
2785 }
2786 if (local_err != NULL) {
2787 error_propagate(errp, local_err);
2788 goto out;
2789 }
2790
2791 out:
2792 aio_context_release(aio_context);
2793 }
2794
2795 /* Common QMP interface for drive-backup and blockdev-backup */
2796 static BlockJob *do_backup_common(BackupCommon *backup,
2797 BlockDriverState *bs,
2798 BlockDriverState *target_bs,
2799 AioContext *aio_context,
2800 JobTxn *txn, Error **errp)
2801 {
2802 BlockJob *job = NULL;
2803 BdrvDirtyBitmap *bmap = NULL;
2804 BackupPerf perf = { .max_workers = 64 };
2805 int job_flags = JOB_DEFAULT;
2806
2807 if (!backup->has_speed) {
2808 backup->speed = 0;
2809 }
2810 if (!backup->has_on_source_error) {
2811 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2812 }
2813 if (!backup->has_on_target_error) {
2814 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2815 }
2816 if (!backup->has_job_id) {
2817 backup->job_id = NULL;
2818 }
2819 if (!backup->has_auto_finalize) {
2820 backup->auto_finalize = true;
2821 }
2822 if (!backup->has_auto_dismiss) {
2823 backup->auto_dismiss = true;
2824 }
2825 if (!backup->has_compress) {
2826 backup->compress = false;
2827 }
2828
2829 if (backup->x_perf) {
2830 if (backup->x_perf->has_use_copy_range) {
2831 perf.use_copy_range = backup->x_perf->use_copy_range;
2832 }
2833 if (backup->x_perf->has_max_workers) {
2834 perf.max_workers = backup->x_perf->max_workers;
2835 }
2836 if (backup->x_perf->has_max_chunk) {
2837 perf.max_chunk = backup->x_perf->max_chunk;
2838 }
2839 }
2840
2841 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
2842 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
2843 /* done before desugaring 'incremental' to print the right message */
2844 if (!backup->has_bitmap) {
2845 error_setg(errp, "must provide a valid bitmap name for "
2846 "'%s' sync mode", MirrorSyncMode_str(backup->sync));
2847 return NULL;
2848 }
2849 }
2850
2851 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) {
2852 if (backup->has_bitmap_mode &&
2853 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) {
2854 error_setg(errp, "Bitmap sync mode must be '%s' "
2855 "when using sync mode '%s'",
2856 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS),
2857 MirrorSyncMode_str(backup->sync));
2858 return NULL;
2859 }
2860 backup->has_bitmap_mode = true;
2861 backup->sync = MIRROR_SYNC_MODE_BITMAP;
2862 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS;
2863 }
2864
2865 if (backup->has_bitmap) {
2866 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
2867 if (!bmap) {
2868 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
2869 return NULL;
2870 }
2871 if (!backup->has_bitmap_mode) {
2872 error_setg(errp, "Bitmap sync mode must be given "
2873 "when providing a bitmap");
2874 return NULL;
2875 }
2876 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2877 return NULL;
2878 }
2879
2880 /* This does not produce a useful bitmap artifact: */
2881 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
2882 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap"
2883 " outputs", MirrorSyncMode_str(backup->sync));
2884 return NULL;
2885 }
2886
2887 /* If the bitmap isn't used for input or output, this is useless: */
2888 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER &&
2889 backup->sync != MIRROR_SYNC_MODE_BITMAP) {
2890 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect"
2891 " when combined with sync mode '%s'",
2892 BitmapSyncMode_str(backup->bitmap_mode),
2893 MirrorSyncMode_str(backup->sync));
2894 return NULL;
2895 }
2896 }
2897
2898 if (!backup->has_bitmap && backup->has_bitmap_mode) {
2899 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap");
2900 return NULL;
2901 }
2902
2903 if (!backup->auto_finalize) {
2904 job_flags |= JOB_MANUAL_FINALIZE;
2905 }
2906 if (!backup->auto_dismiss) {
2907 job_flags |= JOB_MANUAL_DISMISS;
2908 }
2909
2910 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
2911 backup->sync, bmap, backup->bitmap_mode,
2912 backup->compress,
2913 backup->filter_node_name,
2914 &perf,
2915 backup->on_source_error,
2916 backup->on_target_error,
2917 job_flags, NULL, NULL, txn, errp);
2918 return job;
2919 }
2920
2921 void qmp_drive_backup(DriveBackup *backup, Error **errp)
2922 {
2923 TransactionAction action = {
2924 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP,
2925 .u.drive_backup.data = backup,
2926 };
2927 blockdev_do_action(&action, errp);
2928 }
2929
2930 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
2931 bool flat,
2932 Error **errp)
2933 {
2934 bool return_flat = has_flat && flat;
2935
2936 return bdrv_named_nodes_list(return_flat, errp);
2937 }
2938
2939 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
2940 {
2941 return bdrv_get_xdbg_block_graph(errp);
2942 }
2943
2944 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
2945 {
2946 TransactionAction action = {
2947 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
2948 .u.blockdev_backup.data = backup,
2949 };
2950 blockdev_do_action(&action, errp);
2951 }
2952
2953 /* Parameter check and block job starting for drive mirroring.
2954 * Caller should hold @device and @target's aio context (must be the same).
2955 **/
2956 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
2957 BlockDriverState *target,
2958 bool has_replaces, const char *replaces,
2959 enum MirrorSyncMode sync,
2960 BlockMirrorBackingMode backing_mode,
2961 bool zero_target,
2962 bool has_speed, int64_t speed,
2963 bool has_granularity, uint32_t granularity,
2964 bool has_buf_size, int64_t buf_size,
2965 bool has_on_source_error,
2966 BlockdevOnError on_source_error,
2967 bool has_on_target_error,
2968 BlockdevOnError on_target_error,
2969 bool has_unmap, bool unmap,
2970 bool has_filter_node_name,
2971 const char *filter_node_name,
2972 bool has_copy_mode, MirrorCopyMode copy_mode,
2973 bool has_auto_finalize, bool auto_finalize,
2974 bool has_auto_dismiss, bool auto_dismiss,
2975 Error **errp)
2976 {
2977 BlockDriverState *unfiltered_bs;
2978 int job_flags = JOB_DEFAULT;
2979
2980 if (!has_speed) {
2981 speed = 0;
2982 }
2983 if (!has_on_source_error) {
2984 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2985 }
2986 if (!has_on_target_error) {
2987 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2988 }
2989 if (!has_granularity) {
2990 granularity = 0;
2991 }
2992 if (!has_buf_size) {
2993 buf_size = 0;
2994 }
2995 if (!has_unmap) {
2996 unmap = true;
2997 }
2998 if (!has_filter_node_name) {
2999 filter_node_name = NULL;
3000 }
3001 if (!has_copy_mode) {
3002 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
3003 }
3004 if (has_auto_finalize && !auto_finalize) {
3005 job_flags |= JOB_MANUAL_FINALIZE;
3006 }
3007 if (has_auto_dismiss && !auto_dismiss) {
3008 job_flags |= JOB_MANUAL_DISMISS;
3009 }
3010
3011 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3012 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3013 "a value in range [512B, 64MB]");
3014 return;
3015 }
3016 if (granularity & (granularity - 1)) {
3017 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3018 "a power of 2");
3019 return;
3020 }
3021
3022 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3023 return;
3024 }
3025 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3026 return;
3027 }
3028
3029 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) {
3030 sync = MIRROR_SYNC_MODE_FULL;
3031 }
3032
3033 if (!has_replaces) {
3034 /* We want to mirror from @bs, but keep implicit filters on top */
3035 unfiltered_bs = bdrv_skip_implicit_filters(bs);
3036 if (unfiltered_bs != bs) {
3037 replaces = unfiltered_bs->node_name;
3038 has_replaces = true;
3039 }
3040 }
3041
3042 if (has_replaces) {
3043 BlockDriverState *to_replace_bs;
3044 AioContext *replace_aio_context;
3045 int64_t bs_size, replace_size;
3046
3047 bs_size = bdrv_getlength(bs);
3048 if (bs_size < 0) {
3049 error_setg_errno(errp, -bs_size, "Failed to query device's size");
3050 return;
3051 }
3052
3053 to_replace_bs = check_to_replace_node(bs, replaces, errp);
3054 if (!to_replace_bs) {
3055 return;
3056 }
3057
3058 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3059 aio_context_acquire(replace_aio_context);
3060 replace_size = bdrv_getlength(to_replace_bs);
3061 aio_context_release(replace_aio_context);
3062
3063 if (replace_size < 0) {
3064 error_setg_errno(errp, -replace_size,
3065 "Failed to query the replacement node's size");
3066 return;
3067 }
3068 if (bs_size != replace_size) {
3069 error_setg(errp, "cannot replace image with a mirror image of "
3070 "different size");
3071 return;
3072 }
3073 }
3074
3075 /* pass the node name to replace to mirror start since it's loose coupling
3076 * and will allow to check whether the node still exist at mirror completion
3077 */
3078 mirror_start(job_id, bs, target,
3079 has_replaces ? replaces : NULL, job_flags,
3080 speed, granularity, buf_size, sync, backing_mode, zero_target,
3081 on_source_error, on_target_error, unmap, filter_node_name,
3082 copy_mode, errp);
3083 }
3084
3085 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3086 {
3087 BlockDriverState *bs;
3088 BlockDriverState *target_backing_bs, *target_bs;
3089 AioContext *aio_context;
3090 AioContext *old_context;
3091 BlockMirrorBackingMode backing_mode;
3092 Error *local_err = NULL;
3093 QDict *options = NULL;
3094 int flags;
3095 int64_t size;
3096 const char *format = arg->format;
3097 bool zero_target;
3098 int ret;
3099
3100 bs = qmp_get_root_bs(arg->device, errp);
3101 if (!bs) {
3102 return;
3103 }
3104
3105 /* Early check to avoid creating target */
3106 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3107 return;
3108 }
3109
3110 aio_context = bdrv_get_aio_context(bs);
3111 aio_context_acquire(aio_context);
3112
3113 if (!arg->has_mode) {
3114 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3115 }
3116
3117 if (!arg->has_format) {
3118 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3119 ? NULL : bs->drv->format_name);
3120 }
3121
3122 flags = bs->open_flags | BDRV_O_RDWR;
3123 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs));
3124 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) {
3125 arg->sync = MIRROR_SYNC_MODE_FULL;
3126 }
3127 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3128 target_backing_bs = bs;
3129 }
3130
3131 size = bdrv_getlength(bs);
3132 if (size < 0) {
3133 error_setg_errno(errp, -size, "bdrv_getlength failed");
3134 goto out;
3135 }
3136
3137 if (arg->has_replaces) {
3138 if (!arg->has_node_name) {
3139 error_setg(errp, "a node-name must be provided when replacing a"
3140 " named node of the graph");
3141 goto out;
3142 }
3143 }
3144
3145 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3146 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3147 } else {
3148 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3149 }
3150
3151 /* Don't open backing image in create() */
3152 flags |= BDRV_O_NO_BACKING;
3153
3154 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs)
3155 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3156 {
3157 /* create new image w/o backing file */
3158 assert(format);
3159 bdrv_img_create(arg->target, format,
3160 NULL, NULL, NULL, size, flags, false, &local_err);
3161 } else {
3162 /* Implicit filters should not appear in the filename */
3163 BlockDriverState *explicit_backing =
3164 bdrv_skip_implicit_filters(target_backing_bs);
3165
3166 switch (arg->mode) {
3167 case NEW_IMAGE_MODE_EXISTING:
3168 break;
3169 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3170 /* create new image with backing file */
3171 bdrv_refresh_filename(explicit_backing);
3172 bdrv_img_create(arg->target, format,
3173 explicit_backing->filename,
3174 explicit_backing->drv->format_name,
3175 NULL, size, flags, false, &local_err);
3176 break;
3177 default:
3178 abort();
3179 }
3180 }
3181
3182 if (local_err) {
3183 error_propagate(errp, local_err);
3184 goto out;
3185 }
3186
3187 options = qdict_new();
3188 if (arg->has_node_name) {
3189 qdict_put_str(options, "node-name", arg->node_name);
3190 }
3191 if (format) {
3192 qdict_put_str(options, "driver", format);
3193 }
3194
3195 /* Mirroring takes care of copy-on-write using the source's backing
3196 * file.
3197 */
3198 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3199 if (!target_bs) {
3200 goto out;
3201 }
3202
3203 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
3204 (arg->mode == NEW_IMAGE_MODE_EXISTING ||
3205 !bdrv_has_zero_init(target_bs)));
3206
3207
3208 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
3209 old_context = bdrv_get_aio_context(target_bs);
3210 aio_context_release(aio_context);
3211 aio_context_acquire(old_context);
3212
3213 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
3214 if (ret < 0) {
3215 bdrv_unref(target_bs);
3216 aio_context_release(old_context);
3217 return;
3218 }
3219
3220 aio_context_release(old_context);
3221 aio_context_acquire(aio_context);
3222
3223 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3224 arg->has_replaces, arg->replaces, arg->sync,
3225 backing_mode, zero_target,
3226 arg->has_speed, arg->speed,
3227 arg->has_granularity, arg->granularity,
3228 arg->has_buf_size, arg->buf_size,
3229 arg->has_on_source_error, arg->on_source_error,
3230 arg->has_on_target_error, arg->on_target_error,
3231 arg->has_unmap, arg->unmap,
3232 false, NULL,
3233 arg->has_copy_mode, arg->copy_mode,
3234 arg->has_auto_finalize, arg->auto_finalize,
3235 arg->has_auto_dismiss, arg->auto_dismiss,
3236 errp);
3237 bdrv_unref(target_bs);
3238 out:
3239 aio_context_release(aio_context);
3240 }
3241
3242 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3243 const char *device, const char *target,
3244 bool has_replaces, const char *replaces,
3245 MirrorSyncMode sync,
3246 bool has_speed, int64_t speed,
3247 bool has_granularity, uint32_t granularity,
3248 bool has_buf_size, int64_t buf_size,
3249 bool has_on_source_error,
3250 BlockdevOnError on_source_error,
3251 bool has_on_target_error,
3252 BlockdevOnError on_target_error,
3253 bool has_filter_node_name,
3254 const char *filter_node_name,
3255 bool has_copy_mode, MirrorCopyMode copy_mode,
3256 bool has_auto_finalize, bool auto_finalize,
3257 bool has_auto_dismiss, bool auto_dismiss,
3258 Error **errp)
3259 {
3260 BlockDriverState *bs;
3261 BlockDriverState *target_bs;
3262 AioContext *aio_context;
3263 AioContext *old_context;
3264 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3265 bool zero_target;
3266 int ret;
3267
3268 bs = qmp_get_root_bs(device, errp);
3269 if (!bs) {
3270 return;
3271 }
3272
3273 target_bs = bdrv_lookup_bs(target, target, errp);
3274 if (!target_bs) {
3275 return;
3276 }
3277
3278 zero_target = (sync == MIRROR_SYNC_MODE_FULL);
3279
3280 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
3281 old_context = bdrv_get_aio_context(target_bs);
3282 aio_context = bdrv_get_aio_context(bs);
3283 aio_context_acquire(old_context);
3284
3285 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
3286
3287 aio_context_release(old_context);
3288 aio_context_acquire(aio_context);
3289
3290 if (ret < 0) {
3291 goto out;
3292 }
3293
3294 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3295 has_replaces, replaces, sync, backing_mode,
3296 zero_target, has_speed, speed,
3297 has_granularity, granularity,
3298 has_buf_size, buf_size,
3299 has_on_source_error, on_source_error,
3300 has_on_target_error, on_target_error,
3301 true, true,
3302 has_filter_node_name, filter_node_name,
3303 has_copy_mode, copy_mode,
3304 has_auto_finalize, auto_finalize,
3305 has_auto_dismiss, auto_dismiss,
3306 errp);
3307 out:
3308 aio_context_release(aio_context);
3309 }
3310
3311 /* Get a block job using its ID and acquire its AioContext */
3312 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3313 Error **errp)
3314 {
3315 BlockJob *job;
3316
3317 assert(id != NULL);
3318
3319 *aio_context = NULL;
3320
3321 job = block_job_get(id);
3322
3323 if (!job) {
3324 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3325 "Block job '%s' not found", id);
3326 return NULL;
3327 }
3328
3329 *aio_context = blk_get_aio_context(job->blk);
3330 aio_context_acquire(*aio_context);
3331
3332 return job;
3333 }
3334
3335 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3336 {
3337 AioContext *aio_context;
3338 BlockJob *job = find_block_job(device, &aio_context, errp);
3339
3340 if (!job) {
3341 return;
3342 }
3343
3344 block_job_set_speed(job, speed, errp);
3345 aio_context_release(aio_context);
3346 }
3347
3348 void qmp_block_job_cancel(const char *device,
3349 bool has_force, bool force, Error **errp)
3350 {
3351 AioContext *aio_context;
3352 BlockJob *job = find_block_job(device, &aio_context, errp);
3353
3354 if (!job) {
3355 return;
3356 }
3357
3358 if (!has_force) {
3359 force = false;
3360 }
3361
3362 if (job_user_paused(&job->job) && !force) {
3363 error_setg(errp, "The block job for device '%s' is currently paused",
3364 device);
3365 goto out;
3366 }
3367
3368 trace_qmp_block_job_cancel(job);
3369 job_user_cancel(&job->job, force, errp);
3370 out:
3371 aio_context_release(aio_context);
3372 }
3373
3374 void qmp_block_job_pause(const char *device, Error **errp)
3375 {
3376 AioContext *aio_context;
3377 BlockJob *job = find_block_job(device, &aio_context, errp);
3378
3379 if (!job) {
3380 return;
3381 }
3382
3383 trace_qmp_block_job_pause(job);
3384 job_user_pause(&job->job, errp);
3385 aio_context_release(aio_context);
3386 }
3387
3388 void qmp_block_job_resume(const char *device, Error **errp)
3389 {
3390 AioContext *aio_context;
3391 BlockJob *job = find_block_job(device, &aio_context, errp);
3392
3393 if (!job) {
3394 return;
3395 }
3396
3397 trace_qmp_block_job_resume(job);
3398 job_user_resume(&job->job, errp);
3399 aio_context_release(aio_context);
3400 }
3401
3402 void qmp_block_job_complete(const char *device, Error **errp)
3403 {
3404 AioContext *aio_context;
3405 BlockJob *job = find_block_job(device, &aio_context, errp);
3406
3407 if (!job) {
3408 return;
3409 }
3410
3411 trace_qmp_block_job_complete(job);
3412 job_complete(&job->job, errp);
3413 aio_context_release(aio_context);
3414 }
3415
3416 void qmp_block_job_finalize(const char *id, Error **errp)
3417 {
3418 AioContext *aio_context;
3419 BlockJob *job = find_block_job(id, &aio_context, errp);
3420
3421 if (!job) {
3422 return;
3423 }
3424
3425 trace_qmp_block_job_finalize(job);
3426 job_ref(&job->job);
3427 job_finalize(&job->job, errp);
3428
3429 /*
3430 * Job's context might have changed via job_finalize (and job_txn_apply
3431 * automatically acquires the new one), so make sure we release the correct
3432 * one.
3433 */
3434 aio_context = blk_get_aio_context(job->blk);
3435 job_unref(&job->job);
3436 aio_context_release(aio_context);
3437 }
3438
3439 void qmp_block_job_dismiss(const char *id, Error **errp)
3440 {
3441 AioContext *aio_context;
3442 BlockJob *bjob = find_block_job(id, &aio_context, errp);
3443 Job *job;
3444
3445 if (!bjob) {
3446 return;
3447 }
3448
3449 trace_qmp_block_job_dismiss(bjob);
3450 job = &bjob->job;
3451 job_dismiss(&job, errp);
3452 aio_context_release(aio_context);
3453 }
3454
3455 void qmp_change_backing_file(const char *device,
3456 const char *image_node_name,
3457 const char *backing_file,
3458 Error **errp)
3459 {
3460 BlockDriverState *bs = NULL;
3461 AioContext *aio_context;
3462 BlockDriverState *image_bs = NULL;
3463 Error *local_err = NULL;
3464 bool ro;
3465 int ret;
3466
3467 bs = qmp_get_root_bs(device, errp);
3468 if (!bs) {
3469 return;
3470 }
3471
3472 aio_context = bdrv_get_aio_context(bs);
3473 aio_context_acquire(aio_context);
3474
3475 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3476 if (local_err) {
3477 error_propagate(errp, local_err);
3478 goto out;
3479 }
3480
3481 if (!image_bs) {
3482 error_setg(errp, "image file not found");
3483 goto out;
3484 }
3485
3486 if (bdrv_find_base(image_bs) == image_bs) {
3487 error_setg(errp, "not allowing backing file change on an image "
3488 "without a backing file");
3489 goto out;
3490 }
3491
3492 /* even though we are not necessarily operating on bs, we need it to
3493 * determine if block ops are currently prohibited on the chain */
3494 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3495 goto out;
3496 }
3497
3498 /* final sanity check */
3499 if (!bdrv_chain_contains(bs, image_bs)) {
3500 error_setg(errp, "'%s' and image file are not in the same chain",
3501 device);
3502 goto out;
3503 }
3504
3505 /* if not r/w, reopen to make r/w */
3506 ro = bdrv_is_read_only(image_bs);
3507
3508 if (ro) {
3509 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) {
3510 goto out;
3511 }
3512 }
3513
3514 ret = bdrv_change_backing_file(image_bs, backing_file,
3515 image_bs->drv ? image_bs->drv->format_name : "",
3516 false);
3517
3518 if (ret < 0) {
3519 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3520 backing_file);
3521 /* don't exit here, so we can try to restore open flags if
3522 * appropriate */
3523 }
3524
3525 if (ro) {
3526 bdrv_reopen_set_read_only(image_bs, true, errp);
3527 }
3528
3529 out:
3530 aio_context_release(aio_context);
3531 }
3532
3533 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3534 {
3535 BlockDriverState *bs;
3536 QObject *obj;
3537 Visitor *v = qobject_output_visitor_new(&obj);
3538 QDict *qdict;
3539
3540 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3541 visit_complete(v, &obj);
3542 qdict = qobject_to(QDict, obj);
3543
3544 qdict_flatten(qdict);
3545
3546 if (!qdict_get_try_str(qdict, "node-name")) {
3547 error_setg(errp, "'node-name' must be specified for the root node");
3548 goto fail;
3549 }
3550
3551 bs = bds_tree_init(qdict, errp);
3552 if (!bs) {
3553 goto fail;
3554 }
3555
3556 bdrv_set_monitor_owned(bs);
3557
3558 fail:
3559 visit_free(v);
3560 }
3561
3562 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp)
3563 {
3564 BlockDriverState *bs;
3565 AioContext *ctx;
3566 QObject *obj;
3567 Visitor *v = qobject_output_visitor_new(&obj);
3568 BlockReopenQueue *queue;
3569 QDict *qdict;
3570
3571 /* Check for the selected node name */
3572 if (!options->has_node_name) {
3573 error_setg(errp, "node-name not specified");
3574 goto fail;
3575 }
3576
3577 bs = bdrv_find_node(options->node_name);
3578 if (!bs) {
3579 error_setg(errp, "Failed to find node with node-name='%s'",
3580 options->node_name);
3581 goto fail;
3582 }
3583
3584 /* Put all options in a QDict and flatten it */
3585 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3586 visit_complete(v, &obj);
3587 qdict = qobject_to(QDict, obj);
3588
3589 qdict_flatten(qdict);
3590
3591 /* Perform the reopen operation */
3592 ctx = bdrv_get_aio_context(bs);
3593 aio_context_acquire(ctx);
3594 bdrv_subtree_drained_begin(bs);
3595 queue = bdrv_reopen_queue(NULL, bs, qdict, false);
3596 bdrv_reopen_multiple(queue, errp);
3597 bdrv_subtree_drained_end(bs);
3598 aio_context_release(ctx);
3599
3600 fail:
3601 visit_free(v);
3602 }
3603
3604 void qmp_blockdev_del(const char *node_name, Error **errp)
3605 {
3606 AioContext *aio_context;
3607 BlockDriverState *bs;
3608
3609 bs = bdrv_find_node(node_name);
3610 if (!bs) {
3611 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3612 return;
3613 }
3614 if (bdrv_has_blk(bs)) {
3615 error_setg(errp, "Node %s is in use", node_name);
3616 return;
3617 }
3618 aio_context = bdrv_get_aio_context(bs);
3619 aio_context_acquire(aio_context);
3620
3621 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3622 goto out;
3623 }
3624
3625 if (!QTAILQ_IN_USE(bs, monitor_list)) {
3626 error_setg(errp, "Node %s is not owned by the monitor",
3627 bs->node_name);
3628 goto out;
3629 }
3630
3631 if (bs->refcnt > 1) {
3632 error_setg(errp, "Block device %s is in use",
3633 bdrv_get_device_or_node_name(bs));
3634 goto out;
3635 }
3636
3637 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3638 bdrv_unref(bs);
3639
3640 out:
3641 aio_context_release(aio_context);
3642 }
3643
3644 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
3645 const char *child_name)
3646 {
3647 BdrvChild *child;
3648
3649 QLIST_FOREACH(child, &parent_bs->children, next) {
3650 if (strcmp(child->name, child_name) == 0) {
3651 return child;
3652 }
3653 }
3654
3655 return NULL;
3656 }
3657
3658 void qmp_x_blockdev_change(const char *parent, bool has_child,
3659 const char *child, bool has_node,
3660 const char *node, Error **errp)
3661 {
3662 BlockDriverState *parent_bs, *new_bs = NULL;
3663 BdrvChild *p_child;
3664
3665 parent_bs = bdrv_lookup_bs(parent, parent, errp);
3666 if (!parent_bs) {
3667 return;
3668 }
3669
3670 if (has_child == has_node) {
3671 if (has_child) {
3672 error_setg(errp, "The parameters child and node are in conflict");
3673 } else {
3674 error_setg(errp, "Either child or node must be specified");
3675 }
3676 return;
3677 }
3678
3679 if (has_child) {
3680 p_child = bdrv_find_child(parent_bs, child);
3681 if (!p_child) {
3682 error_setg(errp, "Node '%s' does not have child '%s'",
3683 parent, child);
3684 return;
3685 }
3686 bdrv_del_child(parent_bs, p_child, errp);
3687 }
3688
3689 if (has_node) {
3690 new_bs = bdrv_find_node(node);
3691 if (!new_bs) {
3692 error_setg(errp, "Node '%s' not found", node);
3693 return;
3694 }
3695 bdrv_add_child(parent_bs, new_bs, errp);
3696 }
3697 }
3698
3699 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3700 {
3701 BlockJobInfoList *head = NULL, **tail = &head;
3702 BlockJob *job;
3703
3704 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
3705 BlockJobInfo *value;
3706 AioContext *aio_context;
3707
3708 if (block_job_is_internal(job)) {
3709 continue;
3710 }
3711 aio_context = blk_get_aio_context(job->blk);
3712 aio_context_acquire(aio_context);
3713 value = block_job_query(job, errp);
3714 aio_context_release(aio_context);
3715 if (!value) {
3716 qapi_free_BlockJobInfoList(head);
3717 return NULL;
3718 }
3719 QAPI_LIST_APPEND(tail, value);
3720 }
3721
3722 return head;
3723 }
3724
3725 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
3726 bool has_force, bool force, Error **errp)
3727 {
3728 AioContext *old_context;
3729 AioContext *new_context;
3730 BlockDriverState *bs;
3731
3732 bs = bdrv_find_node(node_name);
3733 if (!bs) {
3734 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3735 return;
3736 }
3737
3738 /* Protects against accidents. */
3739 if (!(has_force && force) && bdrv_has_blk(bs)) {
3740 error_setg(errp, "Node %s is associated with a BlockBackend and could "
3741 "be in use (use force=true to override this check)",
3742 node_name);
3743 return;
3744 }
3745
3746 if (iothread->type == QTYPE_QSTRING) {
3747 IOThread *obj = iothread_by_id(iothread->u.s);
3748 if (!obj) {
3749 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
3750 return;
3751 }
3752
3753 new_context = iothread_get_aio_context(obj);
3754 } else {
3755 new_context = qemu_get_aio_context();
3756 }
3757
3758 old_context = bdrv_get_aio_context(bs);
3759 aio_context_acquire(old_context);
3760
3761 bdrv_try_set_aio_context(bs, new_context, errp);
3762
3763 aio_context_release(old_context);
3764 }
3765
3766 QemuOptsList qemu_common_drive_opts = {
3767 .name = "drive",
3768 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3769 .desc = {
3770 {
3771 .name = "snapshot",
3772 .type = QEMU_OPT_BOOL,
3773 .help = "enable/disable snapshot mode",
3774 },{
3775 .name = "aio",
3776 .type = QEMU_OPT_STRING,
3777 .help = "host AIO implementation (threads, native, io_uring)",
3778 },{
3779 .name = BDRV_OPT_CACHE_WB,
3780 .type = QEMU_OPT_BOOL,
3781 .help = "Enable writeback mode",
3782 },{
3783 .name = "format",
3784 .type = QEMU_OPT_STRING,
3785 .help = "disk format (raw, qcow2, ...)",
3786 },{
3787 .name = "rerror",
3788 .type = QEMU_OPT_STRING,
3789 .help = "read error action",
3790 },{
3791 .name = "werror",
3792 .type = QEMU_OPT_STRING,
3793 .help = "write error action",
3794 },{
3795 .name = BDRV_OPT_READ_ONLY,
3796 .type = QEMU_OPT_BOOL,
3797 .help = "open drive file as read-only",
3798 },
3799
3800 THROTTLE_OPTS,
3801
3802 {
3803 .name = "throttling.group",
3804 .type = QEMU_OPT_STRING,
3805 .help = "name of the block throttling group",
3806 },{
3807 .name = "copy-on-read",
3808 .type = QEMU_OPT_BOOL,
3809 .help = "copy read data from backing file into image file",
3810 },{
3811 .name = "detect-zeroes",
3812 .type = QEMU_OPT_STRING,
3813 .help = "try to optimize zero writes (off, on, unmap)",
3814 },{
3815 .name = "stats-account-invalid",
3816 .type = QEMU_OPT_BOOL,
3817 .help = "whether to account for invalid I/O operations "
3818 "in the statistics",
3819 },{
3820 .name = "stats-account-failed",
3821 .type = QEMU_OPT_BOOL,
3822 .help = "whether to account for failed I/O operations "
3823 "in the statistics",
3824 },
3825 { /* end of list */ }
3826 },
3827 };
3828
3829 QemuOptsList qemu_drive_opts = {
3830 .name = "drive",
3831 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3832 .desc = {
3833 /*
3834 * no elements => accept any params
3835 * validation will happen later
3836 */
3837 { /* end of list */ }
3838 },
3839 };
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