9pfs: fix crash when fsdev is missing
[qemu.git] / blockdev.c
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/throttle-groups.h"
39 #include "monitor/monitor.h"
40 #include "qemu/error-report.h"
41 #include "qemu/option.h"
42 #include "qemu/config-file.h"
43 #include "qapi/qmp/types.h"
44 #include "qapi-visit.h"
45 #include "qapi/qmp/qerror.h"
46 #include "qapi/qobject-output-visitor.h"
47 #include "qapi/util.h"
48 #include "sysemu/sysemu.h"
49 #include "block/block_int.h"
50 #include "qmp-commands.h"
51 #include "trace.h"
52 #include "sysemu/arch_init.h"
53 #include "qemu/cutils.h"
54 #include "qemu/help_option.h"
55
56 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
57 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
58
59 static int do_open_tray(const char *blk_name, const char *qdev_id,
60 bool force, Error **errp);
61
62 static const char *const if_name[IF_COUNT] = {
63 [IF_NONE] = "none",
64 [IF_IDE] = "ide",
65 [IF_SCSI] = "scsi",
66 [IF_FLOPPY] = "floppy",
67 [IF_PFLASH] = "pflash",
68 [IF_MTD] = "mtd",
69 [IF_SD] = "sd",
70 [IF_VIRTIO] = "virtio",
71 [IF_XEN] = "xen",
72 };
73
74 static int if_max_devs[IF_COUNT] = {
75 /*
76 * Do not change these numbers! They govern how drive option
77 * index maps to unit and bus. That mapping is ABI.
78 *
79 * All controllers used to implement if=T drives need to support
80 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
81 * Otherwise, some index values map to "impossible" bus, unit
82 * values.
83 *
84 * For instance, if you change [IF_SCSI] to 255, -drive
85 * if=scsi,index=12 no longer means bus=1,unit=5, but
86 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
87 * the drive can't be set up. Regression.
88 */
89 [IF_IDE] = 2,
90 [IF_SCSI] = 7,
91 };
92
93 /**
94 * Boards may call this to offer board-by-board overrides
95 * of the default, global values.
96 */
97 void override_max_devs(BlockInterfaceType type, int max_devs)
98 {
99 BlockBackend *blk;
100 DriveInfo *dinfo;
101
102 if (max_devs <= 0) {
103 return;
104 }
105
106 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
107 dinfo = blk_legacy_dinfo(blk);
108 if (dinfo->type == type) {
109 fprintf(stderr, "Cannot override units-per-bus property of"
110 " the %s interface, because a drive of that type has"
111 " already been added.\n", if_name[type]);
112 g_assert_not_reached();
113 }
114 }
115
116 if_max_devs[type] = max_devs;
117 }
118
119 /*
120 * We automatically delete the drive when a device using it gets
121 * unplugged. Questionable feature, but we can't just drop it.
122 * Device models call blockdev_mark_auto_del() to schedule the
123 * automatic deletion, and generic qdev code calls blockdev_auto_del()
124 * when deletion is actually safe.
125 */
126 void blockdev_mark_auto_del(BlockBackend *blk)
127 {
128 DriveInfo *dinfo = blk_legacy_dinfo(blk);
129 BlockDriverState *bs = blk_bs(blk);
130 AioContext *aio_context;
131
132 if (!dinfo) {
133 return;
134 }
135
136 if (bs) {
137 aio_context = bdrv_get_aio_context(bs);
138 aio_context_acquire(aio_context);
139
140 if (bs->job) {
141 block_job_cancel(bs->job);
142 }
143
144 aio_context_release(aio_context);
145 }
146
147 dinfo->auto_del = 1;
148 }
149
150 void blockdev_auto_del(BlockBackend *blk)
151 {
152 DriveInfo *dinfo = blk_legacy_dinfo(blk);
153
154 if (dinfo && dinfo->auto_del) {
155 monitor_remove_blk(blk);
156 blk_unref(blk);
157 }
158 }
159
160 /**
161 * Returns the current mapping of how many units per bus
162 * a particular interface can support.
163 *
164 * A positive integer indicates n units per bus.
165 * 0 implies the mapping has not been established.
166 * -1 indicates an invalid BlockInterfaceType was given.
167 */
168 int drive_get_max_devs(BlockInterfaceType type)
169 {
170 if (type >= IF_IDE && type < IF_COUNT) {
171 return if_max_devs[type];
172 }
173
174 return -1;
175 }
176
177 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
178 {
179 int max_devs = if_max_devs[type];
180 return max_devs ? index / max_devs : 0;
181 }
182
183 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
184 {
185 int max_devs = if_max_devs[type];
186 return max_devs ? index % max_devs : index;
187 }
188
189 QemuOpts *drive_def(const char *optstr)
190 {
191 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
192 }
193
194 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
195 const char *optstr)
196 {
197 QemuOpts *opts;
198
199 opts = drive_def(optstr);
200 if (!opts) {
201 return NULL;
202 }
203 if (type != IF_DEFAULT) {
204 qemu_opt_set(opts, "if", if_name[type], &error_abort);
205 }
206 if (index >= 0) {
207 qemu_opt_set_number(opts, "index", index, &error_abort);
208 }
209 if (file)
210 qemu_opt_set(opts, "file", file, &error_abort);
211 return opts;
212 }
213
214 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
215 {
216 BlockBackend *blk;
217 DriveInfo *dinfo;
218
219 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
220 dinfo = blk_legacy_dinfo(blk);
221 if (dinfo && dinfo->type == type
222 && dinfo->bus == bus && dinfo->unit == unit) {
223 return dinfo;
224 }
225 }
226
227 return NULL;
228 }
229
230 bool drive_check_orphaned(void)
231 {
232 BlockBackend *blk;
233 DriveInfo *dinfo;
234 bool rs = false;
235
236 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
237 dinfo = blk_legacy_dinfo(blk);
238 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
239 /* Unless this is a default drive, this may be an oversight. */
240 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
241 dinfo->type != IF_NONE) {
242 fprintf(stderr, "Warning: Orphaned drive without device: "
243 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
244 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
245 if_name[dinfo->type], dinfo->bus, dinfo->unit);
246 rs = true;
247 }
248 }
249
250 return rs;
251 }
252
253 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
254 {
255 return drive_get(type,
256 drive_index_to_bus_id(type, index),
257 drive_index_to_unit_id(type, index));
258 }
259
260 int drive_get_max_bus(BlockInterfaceType type)
261 {
262 int max_bus;
263 BlockBackend *blk;
264 DriveInfo *dinfo;
265
266 max_bus = -1;
267 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
268 dinfo = blk_legacy_dinfo(blk);
269 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
270 max_bus = dinfo->bus;
271 }
272 }
273 return max_bus;
274 }
275
276 /* Get a block device. This should only be used for single-drive devices
277 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
278 appropriate bus. */
279 DriveInfo *drive_get_next(BlockInterfaceType type)
280 {
281 static int next_block_unit[IF_COUNT];
282
283 return drive_get(type, 0, next_block_unit[type]++);
284 }
285
286 static void bdrv_format_print(void *opaque, const char *name)
287 {
288 error_printf(" %s", name);
289 }
290
291 typedef struct {
292 QEMUBH *bh;
293 BlockDriverState *bs;
294 } BDRVPutRefBH;
295
296 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
297 {
298 if (!strcmp(buf, "ignore")) {
299 return BLOCKDEV_ON_ERROR_IGNORE;
300 } else if (!is_read && !strcmp(buf, "enospc")) {
301 return BLOCKDEV_ON_ERROR_ENOSPC;
302 } else if (!strcmp(buf, "stop")) {
303 return BLOCKDEV_ON_ERROR_STOP;
304 } else if (!strcmp(buf, "report")) {
305 return BLOCKDEV_ON_ERROR_REPORT;
306 } else {
307 error_setg(errp, "'%s' invalid %s error action",
308 buf, is_read ? "read" : "write");
309 return -1;
310 }
311 }
312
313 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
314 Error **errp)
315 {
316 const QListEntry *entry;
317 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
318 switch (qobject_type(entry->value)) {
319
320 case QTYPE_QSTRING: {
321 unsigned long long length;
322 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
323 if (parse_uint_full(str, &length, 10) == 0 &&
324 length > 0 && length <= UINT_MAX) {
325 block_acct_add_interval(stats, (unsigned) length);
326 } else {
327 error_setg(errp, "Invalid interval length: %s", str);
328 return false;
329 }
330 break;
331 }
332
333 case QTYPE_QINT: {
334 int64_t length = qint_get_int(qobject_to_qint(entry->value));
335 if (length > 0 && length <= UINT_MAX) {
336 block_acct_add_interval(stats, (unsigned) length);
337 } else {
338 error_setg(errp, "Invalid interval length: %" PRId64, length);
339 return false;
340 }
341 break;
342 }
343
344 default:
345 error_setg(errp, "The specification of stats-intervals is invalid");
346 return false;
347 }
348 }
349 return true;
350 }
351
352 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
353
354 /* All parameters but @opts are optional and may be set to NULL. */
355 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
356 const char **throttling_group, ThrottleConfig *throttle_cfg,
357 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
358 {
359 Error *local_error = NULL;
360 const char *aio;
361
362 if (bdrv_flags) {
363 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
364 *bdrv_flags |= BDRV_O_COPY_ON_READ;
365 }
366
367 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
368 if (!strcmp(aio, "native")) {
369 *bdrv_flags |= BDRV_O_NATIVE_AIO;
370 } else if (!strcmp(aio, "threads")) {
371 /* this is the default */
372 } else {
373 error_setg(errp, "invalid aio option");
374 return;
375 }
376 }
377 }
378
379 /* disk I/O throttling */
380 if (throttling_group) {
381 *throttling_group = qemu_opt_get(opts, "throttling.group");
382 }
383
384 if (throttle_cfg) {
385 throttle_config_init(throttle_cfg);
386 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
387 qemu_opt_get_number(opts, "throttling.bps-total", 0);
388 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
389 qemu_opt_get_number(opts, "throttling.bps-read", 0);
390 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
391 qemu_opt_get_number(opts, "throttling.bps-write", 0);
392 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
393 qemu_opt_get_number(opts, "throttling.iops-total", 0);
394 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
395 qemu_opt_get_number(opts, "throttling.iops-read", 0);
396 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
397 qemu_opt_get_number(opts, "throttling.iops-write", 0);
398
399 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
400 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
401 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
402 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
403 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
404 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
405 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
406 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
407 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
408 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
409 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
410 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
411
412 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
413 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
414 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
415 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
416 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
417 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
418 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
419 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
420 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
421 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
422 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
423 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
424
425 throttle_cfg->op_size =
426 qemu_opt_get_number(opts, "throttling.iops-size", 0);
427
428 if (!throttle_is_valid(throttle_cfg, errp)) {
429 return;
430 }
431 }
432
433 if (detect_zeroes) {
434 *detect_zeroes =
435 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
436 qemu_opt_get(opts, "detect-zeroes"),
437 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
438 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
439 &local_error);
440 if (local_error) {
441 error_propagate(errp, local_error);
442 return;
443 }
444 }
445 }
446
447 /* Takes the ownership of bs_opts */
448 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
449 Error **errp)
450 {
451 const char *buf;
452 int bdrv_flags = 0;
453 int on_read_error, on_write_error;
454 bool account_invalid, account_failed;
455 bool writethrough, read_only;
456 BlockBackend *blk;
457 BlockDriverState *bs;
458 ThrottleConfig cfg;
459 int snapshot = 0;
460 Error *error = NULL;
461 QemuOpts *opts;
462 QDict *interval_dict = NULL;
463 QList *interval_list = NULL;
464 const char *id;
465 BlockdevDetectZeroesOptions detect_zeroes =
466 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
467 const char *throttling_group = NULL;
468
469 /* Check common options by copying from bs_opts to opts, all other options
470 * stay in bs_opts for processing by bdrv_open(). */
471 id = qdict_get_try_str(bs_opts, "id");
472 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
473 if (error) {
474 error_propagate(errp, error);
475 goto err_no_opts;
476 }
477
478 qemu_opts_absorb_qdict(opts, bs_opts, &error);
479 if (error) {
480 error_propagate(errp, error);
481 goto early_err;
482 }
483
484 if (id) {
485 qdict_del(bs_opts, "id");
486 }
487
488 /* extract parameters */
489 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
490
491 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
492 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
493
494 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
495
496 id = qemu_opts_id(opts);
497
498 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
499 qdict_array_split(interval_dict, &interval_list);
500
501 if (qdict_size(interval_dict) != 0) {
502 error_setg(errp, "Invalid option stats-intervals.%s",
503 qdict_first(interval_dict)->key);
504 goto early_err;
505 }
506
507 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
508 &detect_zeroes, &error);
509 if (error) {
510 error_propagate(errp, error);
511 goto early_err;
512 }
513
514 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
515 if (is_help_option(buf)) {
516 error_printf("Supported formats:");
517 bdrv_iterate_format(bdrv_format_print, NULL);
518 error_printf("\n");
519 goto early_err;
520 }
521
522 if (qdict_haskey(bs_opts, "driver")) {
523 error_setg(errp, "Cannot specify both 'driver' and 'format'");
524 goto early_err;
525 }
526 qdict_put(bs_opts, "driver", qstring_from_str(buf));
527 }
528
529 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
530 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
531 on_write_error = parse_block_error_action(buf, 0, &error);
532 if (error) {
533 error_propagate(errp, error);
534 goto early_err;
535 }
536 }
537
538 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
539 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
540 on_read_error = parse_block_error_action(buf, 1, &error);
541 if (error) {
542 error_propagate(errp, error);
543 goto early_err;
544 }
545 }
546
547 if (snapshot) {
548 bdrv_flags |= BDRV_O_SNAPSHOT;
549 }
550
551 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
552
553 /* init */
554 if ((!file || !*file) && !qdict_size(bs_opts)) {
555 BlockBackendRootState *blk_rs;
556
557 blk = blk_new();
558 blk_rs = blk_get_root_state(blk);
559 blk_rs->open_flags = bdrv_flags;
560 blk_rs->read_only = read_only;
561 blk_rs->detect_zeroes = detect_zeroes;
562
563 QDECREF(bs_opts);
564 } else {
565 if (file && !*file) {
566 file = NULL;
567 }
568
569 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
570 * with other callers) rather than what we want as the real defaults.
571 * Apply the defaults here instead. */
572 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
573 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
574 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
575 read_only ? "on" : "off");
576 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
577
578 if (runstate_check(RUN_STATE_INMIGRATE)) {
579 bdrv_flags |= BDRV_O_INACTIVE;
580 }
581
582 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
583 if (!blk) {
584 goto err_no_bs_opts;
585 }
586 bs = blk_bs(blk);
587
588 bs->detect_zeroes = detect_zeroes;
589
590 if (bdrv_key_required(bs)) {
591 autostart = 0;
592 }
593
594 block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
595
596 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
597 blk_unref(blk);
598 blk = NULL;
599 goto err_no_bs_opts;
600 }
601 }
602
603 /* disk I/O throttling */
604 if (throttle_enabled(&cfg)) {
605 if (!throttling_group) {
606 throttling_group = id;
607 }
608 blk_io_limits_enable(blk, throttling_group);
609 blk_set_io_limits(blk, &cfg);
610 }
611
612 blk_set_enable_write_cache(blk, !writethrough);
613 blk_set_on_error(blk, on_read_error, on_write_error);
614
615 if (!monitor_add_blk(blk, id, errp)) {
616 blk_unref(blk);
617 blk = NULL;
618 goto err_no_bs_opts;
619 }
620
621 err_no_bs_opts:
622 qemu_opts_del(opts);
623 QDECREF(interval_dict);
624 QDECREF(interval_list);
625 return blk;
626
627 early_err:
628 qemu_opts_del(opts);
629 QDECREF(interval_dict);
630 QDECREF(interval_list);
631 err_no_opts:
632 QDECREF(bs_opts);
633 return NULL;
634 }
635
636 /* Takes the ownership of bs_opts */
637 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
638 {
639 int bdrv_flags = 0;
640
641 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
642 * with other callers) rather than what we want as the real defaults.
643 * Apply the defaults here instead. */
644 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
645 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
646 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
647
648 if (runstate_check(RUN_STATE_INMIGRATE)) {
649 bdrv_flags |= BDRV_O_INACTIVE;
650 }
651
652 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
653 }
654
655 void blockdev_close_all_bdrv_states(void)
656 {
657 BlockDriverState *bs, *next_bs;
658
659 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
660 AioContext *ctx = bdrv_get_aio_context(bs);
661
662 aio_context_acquire(ctx);
663 bdrv_unref(bs);
664 aio_context_release(ctx);
665 }
666 }
667
668 /* Iterates over the list of monitor-owned BlockDriverStates */
669 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
670 {
671 return bs ? QTAILQ_NEXT(bs, monitor_list)
672 : QTAILQ_FIRST(&monitor_bdrv_states);
673 }
674
675 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
676 Error **errp)
677 {
678 const char *value;
679
680 value = qemu_opt_get(opts, from);
681 if (value) {
682 if (qemu_opt_find(opts, to)) {
683 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
684 "same time", to, from);
685 return;
686 }
687 }
688
689 /* rename all items in opts */
690 while ((value = qemu_opt_get(opts, from))) {
691 qemu_opt_set(opts, to, value, &error_abort);
692 qemu_opt_unset(opts, from);
693 }
694 }
695
696 QemuOptsList qemu_legacy_drive_opts = {
697 .name = "drive",
698 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
699 .desc = {
700 {
701 .name = "bus",
702 .type = QEMU_OPT_NUMBER,
703 .help = "bus number",
704 },{
705 .name = "unit",
706 .type = QEMU_OPT_NUMBER,
707 .help = "unit number (i.e. lun for scsi)",
708 },{
709 .name = "index",
710 .type = QEMU_OPT_NUMBER,
711 .help = "index number",
712 },{
713 .name = "media",
714 .type = QEMU_OPT_STRING,
715 .help = "media type (disk, cdrom)",
716 },{
717 .name = "if",
718 .type = QEMU_OPT_STRING,
719 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
720 },{
721 .name = "cyls",
722 .type = QEMU_OPT_NUMBER,
723 .help = "number of cylinders (ide disk geometry)",
724 },{
725 .name = "heads",
726 .type = QEMU_OPT_NUMBER,
727 .help = "number of heads (ide disk geometry)",
728 },{
729 .name = "secs",
730 .type = QEMU_OPT_NUMBER,
731 .help = "number of sectors (ide disk geometry)",
732 },{
733 .name = "trans",
734 .type = QEMU_OPT_STRING,
735 .help = "chs translation (auto, lba, none)",
736 },{
737 .name = "boot",
738 .type = QEMU_OPT_BOOL,
739 .help = "(deprecated, ignored)",
740 },{
741 .name = "addr",
742 .type = QEMU_OPT_STRING,
743 .help = "pci address (virtio only)",
744 },{
745 .name = "serial",
746 .type = QEMU_OPT_STRING,
747 .help = "disk serial number",
748 },{
749 .name = "file",
750 .type = QEMU_OPT_STRING,
751 .help = "file name",
752 },
753
754 /* Options that are passed on, but have special semantics with -drive */
755 {
756 .name = BDRV_OPT_READ_ONLY,
757 .type = QEMU_OPT_BOOL,
758 .help = "open drive file as read-only",
759 },{
760 .name = "rerror",
761 .type = QEMU_OPT_STRING,
762 .help = "read error action",
763 },{
764 .name = "werror",
765 .type = QEMU_OPT_STRING,
766 .help = "write error action",
767 },{
768 .name = "copy-on-read",
769 .type = QEMU_OPT_BOOL,
770 .help = "copy read data from backing file into image file",
771 },
772
773 { /* end of list */ }
774 },
775 };
776
777 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
778 {
779 const char *value;
780 BlockBackend *blk;
781 DriveInfo *dinfo = NULL;
782 QDict *bs_opts;
783 QemuOpts *legacy_opts;
784 DriveMediaType media = MEDIA_DISK;
785 BlockInterfaceType type;
786 int cyls, heads, secs, translation;
787 int max_devs, bus_id, unit_id, index;
788 const char *devaddr;
789 const char *werror, *rerror;
790 bool read_only = false;
791 bool copy_on_read;
792 const char *serial;
793 const char *filename;
794 Error *local_err = NULL;
795 int i;
796
797 /* Change legacy command line options into QMP ones */
798 static const struct {
799 const char *from;
800 const char *to;
801 } opt_renames[] = {
802 { "iops", "throttling.iops-total" },
803 { "iops_rd", "throttling.iops-read" },
804 { "iops_wr", "throttling.iops-write" },
805
806 { "bps", "throttling.bps-total" },
807 { "bps_rd", "throttling.bps-read" },
808 { "bps_wr", "throttling.bps-write" },
809
810 { "iops_max", "throttling.iops-total-max" },
811 { "iops_rd_max", "throttling.iops-read-max" },
812 { "iops_wr_max", "throttling.iops-write-max" },
813
814 { "bps_max", "throttling.bps-total-max" },
815 { "bps_rd_max", "throttling.bps-read-max" },
816 { "bps_wr_max", "throttling.bps-write-max" },
817
818 { "iops_size", "throttling.iops-size" },
819
820 { "group", "throttling.group" },
821
822 { "readonly", BDRV_OPT_READ_ONLY },
823 };
824
825 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
826 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
827 &local_err);
828 if (local_err) {
829 error_report_err(local_err);
830 return NULL;
831 }
832 }
833
834 value = qemu_opt_get(all_opts, "cache");
835 if (value) {
836 int flags = 0;
837 bool writethrough;
838
839 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
840 error_report("invalid cache option");
841 return NULL;
842 }
843
844 /* Specific options take precedence */
845 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
846 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
847 !writethrough, &error_abort);
848 }
849 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
850 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
851 !!(flags & BDRV_O_NOCACHE), &error_abort);
852 }
853 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
854 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
855 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
856 }
857 qemu_opt_unset(all_opts, "cache");
858 }
859
860 /* Get a QDict for processing the options */
861 bs_opts = qdict_new();
862 qemu_opts_to_qdict(all_opts, bs_opts);
863
864 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
865 &error_abort);
866 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
867 if (local_err) {
868 error_report_err(local_err);
869 goto fail;
870 }
871
872 /* Deprecated option boot=[on|off] */
873 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
874 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
875 "ignored. Future versions will reject this parameter. Please "
876 "update your scripts.\n");
877 }
878
879 /* Media type */
880 value = qemu_opt_get(legacy_opts, "media");
881 if (value) {
882 if (!strcmp(value, "disk")) {
883 media = MEDIA_DISK;
884 } else if (!strcmp(value, "cdrom")) {
885 media = MEDIA_CDROM;
886 read_only = true;
887 } else {
888 error_report("'%s' invalid media", value);
889 goto fail;
890 }
891 }
892
893 /* copy-on-read is disabled with a warning for read-only devices */
894 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
895 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
896
897 if (read_only && copy_on_read) {
898 error_report("warning: disabling copy-on-read on read-only drive");
899 copy_on_read = false;
900 }
901
902 qdict_put(bs_opts, BDRV_OPT_READ_ONLY,
903 qstring_from_str(read_only ? "on" : "off"));
904 qdict_put(bs_opts, "copy-on-read",
905 qstring_from_str(copy_on_read ? "on" :"off"));
906
907 /* Controller type */
908 value = qemu_opt_get(legacy_opts, "if");
909 if (value) {
910 for (type = 0;
911 type < IF_COUNT && strcmp(value, if_name[type]);
912 type++) {
913 }
914 if (type == IF_COUNT) {
915 error_report("unsupported bus type '%s'", value);
916 goto fail;
917 }
918 } else {
919 type = block_default_type;
920 }
921
922 /* Geometry */
923 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
924 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
925 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
926
927 if (cyls || heads || secs) {
928 if (cyls < 1) {
929 error_report("invalid physical cyls number");
930 goto fail;
931 }
932 if (heads < 1) {
933 error_report("invalid physical heads number");
934 goto fail;
935 }
936 if (secs < 1) {
937 error_report("invalid physical secs number");
938 goto fail;
939 }
940 }
941
942 translation = BIOS_ATA_TRANSLATION_AUTO;
943 value = qemu_opt_get(legacy_opts, "trans");
944 if (value != NULL) {
945 if (!cyls) {
946 error_report("'%s' trans must be used with cyls, heads and secs",
947 value);
948 goto fail;
949 }
950 if (!strcmp(value, "none")) {
951 translation = BIOS_ATA_TRANSLATION_NONE;
952 } else if (!strcmp(value, "lba")) {
953 translation = BIOS_ATA_TRANSLATION_LBA;
954 } else if (!strcmp(value, "large")) {
955 translation = BIOS_ATA_TRANSLATION_LARGE;
956 } else if (!strcmp(value, "rechs")) {
957 translation = BIOS_ATA_TRANSLATION_RECHS;
958 } else if (!strcmp(value, "auto")) {
959 translation = BIOS_ATA_TRANSLATION_AUTO;
960 } else {
961 error_report("'%s' invalid translation type", value);
962 goto fail;
963 }
964 }
965
966 if (media == MEDIA_CDROM) {
967 if (cyls || secs || heads) {
968 error_report("CHS can't be set with media=cdrom");
969 goto fail;
970 }
971 }
972
973 /* Device address specified by bus/unit or index.
974 * If none was specified, try to find the first free one. */
975 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
976 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
977 index = qemu_opt_get_number(legacy_opts, "index", -1);
978
979 max_devs = if_max_devs[type];
980
981 if (index != -1) {
982 if (bus_id != 0 || unit_id != -1) {
983 error_report("index cannot be used with bus and unit");
984 goto fail;
985 }
986 bus_id = drive_index_to_bus_id(type, index);
987 unit_id = drive_index_to_unit_id(type, index);
988 }
989
990 if (unit_id == -1) {
991 unit_id = 0;
992 while (drive_get(type, bus_id, unit_id) != NULL) {
993 unit_id++;
994 if (max_devs && unit_id >= max_devs) {
995 unit_id -= max_devs;
996 bus_id++;
997 }
998 }
999 }
1000
1001 if (max_devs && unit_id >= max_devs) {
1002 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1003 goto fail;
1004 }
1005
1006 if (drive_get(type, bus_id, unit_id) != NULL) {
1007 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1008 bus_id, unit_id, index);
1009 goto fail;
1010 }
1011
1012 /* Serial number */
1013 serial = qemu_opt_get(legacy_opts, "serial");
1014
1015 /* no id supplied -> create one */
1016 if (qemu_opts_id(all_opts) == NULL) {
1017 char *new_id;
1018 const char *mediastr = "";
1019 if (type == IF_IDE || type == IF_SCSI) {
1020 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1021 }
1022 if (max_devs) {
1023 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1024 mediastr, unit_id);
1025 } else {
1026 new_id = g_strdup_printf("%s%s%i", if_name[type],
1027 mediastr, unit_id);
1028 }
1029 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1030 g_free(new_id);
1031 }
1032
1033 /* Add virtio block device */
1034 devaddr = qemu_opt_get(legacy_opts, "addr");
1035 if (devaddr && type != IF_VIRTIO) {
1036 error_report("addr is not supported by this bus type");
1037 goto fail;
1038 }
1039
1040 if (type == IF_VIRTIO) {
1041 QemuOpts *devopts;
1042 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1043 &error_abort);
1044 if (arch_type == QEMU_ARCH_S390X) {
1045 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1046 } else {
1047 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1048 }
1049 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1050 &error_abort);
1051 if (devaddr) {
1052 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1053 }
1054 }
1055
1056 filename = qemu_opt_get(legacy_opts, "file");
1057
1058 /* Check werror/rerror compatibility with if=... */
1059 werror = qemu_opt_get(legacy_opts, "werror");
1060 if (werror != NULL) {
1061 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1062 type != IF_NONE) {
1063 error_report("werror is not supported by this bus type");
1064 goto fail;
1065 }
1066 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1067 }
1068
1069 rerror = qemu_opt_get(legacy_opts, "rerror");
1070 if (rerror != NULL) {
1071 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1072 type != IF_NONE) {
1073 error_report("rerror is not supported by this bus type");
1074 goto fail;
1075 }
1076 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1077 }
1078
1079 /* Actual block device init: Functionality shared with blockdev-add */
1080 blk = blockdev_init(filename, bs_opts, &local_err);
1081 bs_opts = NULL;
1082 if (!blk) {
1083 if (local_err) {
1084 error_report_err(local_err);
1085 }
1086 goto fail;
1087 } else {
1088 assert(!local_err);
1089 }
1090
1091 /* Create legacy DriveInfo */
1092 dinfo = g_malloc0(sizeof(*dinfo));
1093 dinfo->opts = all_opts;
1094
1095 dinfo->cyls = cyls;
1096 dinfo->heads = heads;
1097 dinfo->secs = secs;
1098 dinfo->trans = translation;
1099
1100 dinfo->type = type;
1101 dinfo->bus = bus_id;
1102 dinfo->unit = unit_id;
1103 dinfo->devaddr = devaddr;
1104 dinfo->serial = g_strdup(serial);
1105
1106 blk_set_legacy_dinfo(blk, dinfo);
1107
1108 switch(type) {
1109 case IF_IDE:
1110 case IF_SCSI:
1111 case IF_XEN:
1112 case IF_NONE:
1113 dinfo->media_cd = media == MEDIA_CDROM;
1114 break;
1115 default:
1116 break;
1117 }
1118
1119 fail:
1120 qemu_opts_del(legacy_opts);
1121 QDECREF(bs_opts);
1122 return dinfo;
1123 }
1124
1125 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1126 {
1127 BlockDriverState *bs;
1128
1129 bs = bdrv_lookup_bs(name, name, errp);
1130 if (bs == NULL) {
1131 return NULL;
1132 }
1133
1134 if (!bdrv_is_root_node(bs)) {
1135 error_setg(errp, "Need a root block node");
1136 return NULL;
1137 }
1138
1139 if (!bdrv_is_inserted(bs)) {
1140 error_setg(errp, "Device has no medium");
1141 return NULL;
1142 }
1143
1144 return bs;
1145 }
1146
1147 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id,
1148 Error **errp)
1149 {
1150 BlockBackend *blk;
1151
1152 if (!blk_name == !qdev_id) {
1153 error_setg(errp, "Need exactly one of 'device' and 'id'");
1154 return NULL;
1155 }
1156
1157 if (qdev_id) {
1158 blk = blk_by_qdev_id(qdev_id, errp);
1159 } else {
1160 blk = blk_by_name(blk_name);
1161 if (blk == NULL) {
1162 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1163 "Device '%s' not found", blk_name);
1164 }
1165 }
1166
1167 return blk;
1168 }
1169
1170 void hmp_commit(Monitor *mon, const QDict *qdict)
1171 {
1172 const char *device = qdict_get_str(qdict, "device");
1173 BlockBackend *blk;
1174 int ret;
1175
1176 if (!strcmp(device, "all")) {
1177 ret = blk_commit_all();
1178 } else {
1179 BlockDriverState *bs;
1180 AioContext *aio_context;
1181
1182 blk = blk_by_name(device);
1183 if (!blk) {
1184 monitor_printf(mon, "Device '%s' not found\n", device);
1185 return;
1186 }
1187 if (!blk_is_available(blk)) {
1188 monitor_printf(mon, "Device '%s' has no medium\n", device);
1189 return;
1190 }
1191
1192 bs = blk_bs(blk);
1193 aio_context = bdrv_get_aio_context(bs);
1194 aio_context_acquire(aio_context);
1195
1196 ret = bdrv_commit(bs);
1197
1198 aio_context_release(aio_context);
1199 }
1200 if (ret < 0) {
1201 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1202 strerror(-ret));
1203 }
1204 }
1205
1206 static void blockdev_do_action(TransactionAction *action, Error **errp)
1207 {
1208 TransactionActionList list;
1209
1210 list.value = action;
1211 list.next = NULL;
1212 qmp_transaction(&list, false, NULL, errp);
1213 }
1214
1215 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1216 bool has_node_name, const char *node_name,
1217 const char *snapshot_file,
1218 bool has_snapshot_node_name,
1219 const char *snapshot_node_name,
1220 bool has_format, const char *format,
1221 bool has_mode, NewImageMode mode, Error **errp)
1222 {
1223 BlockdevSnapshotSync snapshot = {
1224 .has_device = has_device,
1225 .device = (char *) device,
1226 .has_node_name = has_node_name,
1227 .node_name = (char *) node_name,
1228 .snapshot_file = (char *) snapshot_file,
1229 .has_snapshot_node_name = has_snapshot_node_name,
1230 .snapshot_node_name = (char *) snapshot_node_name,
1231 .has_format = has_format,
1232 .format = (char *) format,
1233 .has_mode = has_mode,
1234 .mode = mode,
1235 };
1236 TransactionAction action = {
1237 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1238 .u.blockdev_snapshot_sync.data = &snapshot,
1239 };
1240 blockdev_do_action(&action, errp);
1241 }
1242
1243 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1244 Error **errp)
1245 {
1246 BlockdevSnapshot snapshot_data = {
1247 .node = (char *) node,
1248 .overlay = (char *) overlay
1249 };
1250 TransactionAction action = {
1251 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1252 .u.blockdev_snapshot.data = &snapshot_data,
1253 };
1254 blockdev_do_action(&action, errp);
1255 }
1256
1257 void qmp_blockdev_snapshot_internal_sync(const char *device,
1258 const char *name,
1259 Error **errp)
1260 {
1261 BlockdevSnapshotInternal snapshot = {
1262 .device = (char *) device,
1263 .name = (char *) name
1264 };
1265 TransactionAction action = {
1266 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1267 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1268 };
1269 blockdev_do_action(&action, errp);
1270 }
1271
1272 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1273 bool has_id,
1274 const char *id,
1275 bool has_name,
1276 const char *name,
1277 Error **errp)
1278 {
1279 BlockDriverState *bs;
1280 AioContext *aio_context;
1281 QEMUSnapshotInfo sn;
1282 Error *local_err = NULL;
1283 SnapshotInfo *info = NULL;
1284 int ret;
1285
1286 bs = qmp_get_root_bs(device, errp);
1287 if (!bs) {
1288 return NULL;
1289 }
1290 aio_context = bdrv_get_aio_context(bs);
1291 aio_context_acquire(aio_context);
1292
1293 if (!has_id) {
1294 id = NULL;
1295 }
1296
1297 if (!has_name) {
1298 name = NULL;
1299 }
1300
1301 if (!id && !name) {
1302 error_setg(errp, "Name or id must be provided");
1303 goto out_aio_context;
1304 }
1305
1306 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1307 goto out_aio_context;
1308 }
1309
1310 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1311 if (local_err) {
1312 error_propagate(errp, local_err);
1313 goto out_aio_context;
1314 }
1315 if (!ret) {
1316 error_setg(errp,
1317 "Snapshot with id '%s' and name '%s' does not exist on "
1318 "device '%s'",
1319 STR_OR_NULL(id), STR_OR_NULL(name), device);
1320 goto out_aio_context;
1321 }
1322
1323 bdrv_snapshot_delete(bs, id, name, &local_err);
1324 if (local_err) {
1325 error_propagate(errp, local_err);
1326 goto out_aio_context;
1327 }
1328
1329 aio_context_release(aio_context);
1330
1331 info = g_new0(SnapshotInfo, 1);
1332 info->id = g_strdup(sn.id_str);
1333 info->name = g_strdup(sn.name);
1334 info->date_nsec = sn.date_nsec;
1335 info->date_sec = sn.date_sec;
1336 info->vm_state_size = sn.vm_state_size;
1337 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1338 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1339
1340 return info;
1341
1342 out_aio_context:
1343 aio_context_release(aio_context);
1344 return NULL;
1345 }
1346
1347 /**
1348 * block_dirty_bitmap_lookup:
1349 * Return a dirty bitmap (if present), after validating
1350 * the node reference and bitmap names.
1351 *
1352 * @node: The name of the BDS node to search for bitmaps
1353 * @name: The name of the bitmap to search for
1354 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1355 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1356 * @errp: Output pointer for error information. Can be NULL.
1357 *
1358 * @return: A bitmap object on success, or NULL on failure.
1359 */
1360 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1361 const char *name,
1362 BlockDriverState **pbs,
1363 AioContext **paio,
1364 Error **errp)
1365 {
1366 BlockDriverState *bs;
1367 BdrvDirtyBitmap *bitmap;
1368 AioContext *aio_context;
1369
1370 if (!node) {
1371 error_setg(errp, "Node cannot be NULL");
1372 return NULL;
1373 }
1374 if (!name) {
1375 error_setg(errp, "Bitmap name cannot be NULL");
1376 return NULL;
1377 }
1378 bs = bdrv_lookup_bs(node, node, NULL);
1379 if (!bs) {
1380 error_setg(errp, "Node '%s' not found", node);
1381 return NULL;
1382 }
1383
1384 aio_context = bdrv_get_aio_context(bs);
1385 aio_context_acquire(aio_context);
1386
1387 bitmap = bdrv_find_dirty_bitmap(bs, name);
1388 if (!bitmap) {
1389 error_setg(errp, "Dirty bitmap '%s' not found", name);
1390 goto fail;
1391 }
1392
1393 if (pbs) {
1394 *pbs = bs;
1395 }
1396 if (paio) {
1397 *paio = aio_context;
1398 } else {
1399 aio_context_release(aio_context);
1400 }
1401
1402 return bitmap;
1403
1404 fail:
1405 aio_context_release(aio_context);
1406 return NULL;
1407 }
1408
1409 /* New and old BlockDriverState structs for atomic group operations */
1410
1411 typedef struct BlkActionState BlkActionState;
1412
1413 /**
1414 * BlkActionOps:
1415 * Table of operations that define an Action.
1416 *
1417 * @instance_size: Size of state struct, in bytes.
1418 * @prepare: Prepare the work, must NOT be NULL.
1419 * @commit: Commit the changes, can be NULL.
1420 * @abort: Abort the changes on fail, can be NULL.
1421 * @clean: Clean up resources after all transaction actions have called
1422 * commit() or abort(). Can be NULL.
1423 *
1424 * Only prepare() may fail. In a single transaction, only one of commit() or
1425 * abort() will be called. clean() will always be called if it is present.
1426 */
1427 typedef struct BlkActionOps {
1428 size_t instance_size;
1429 void (*prepare)(BlkActionState *common, Error **errp);
1430 void (*commit)(BlkActionState *common);
1431 void (*abort)(BlkActionState *common);
1432 void (*clean)(BlkActionState *common);
1433 } BlkActionOps;
1434
1435 /**
1436 * BlkActionState:
1437 * Describes one Action's state within a Transaction.
1438 *
1439 * @action: QAPI-defined enum identifying which Action to perform.
1440 * @ops: Table of ActionOps this Action can perform.
1441 * @block_job_txn: Transaction which this action belongs to.
1442 * @entry: List membership for all Actions in this Transaction.
1443 *
1444 * This structure must be arranged as first member in a subclassed type,
1445 * assuming that the compiler will also arrange it to the same offsets as the
1446 * base class.
1447 */
1448 struct BlkActionState {
1449 TransactionAction *action;
1450 const BlkActionOps *ops;
1451 BlockJobTxn *block_job_txn;
1452 TransactionProperties *txn_props;
1453 QSIMPLEQ_ENTRY(BlkActionState) entry;
1454 };
1455
1456 /* internal snapshot private data */
1457 typedef struct InternalSnapshotState {
1458 BlkActionState common;
1459 BlockDriverState *bs;
1460 AioContext *aio_context;
1461 QEMUSnapshotInfo sn;
1462 bool created;
1463 } InternalSnapshotState;
1464
1465
1466 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1467 {
1468 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1469 error_setg(errp,
1470 "Action '%s' does not support Transaction property "
1471 "completion-mode = %s",
1472 TransactionActionKind_lookup[s->action->type],
1473 ActionCompletionMode_lookup[s->txn_props->completion_mode]);
1474 return -1;
1475 }
1476 return 0;
1477 }
1478
1479 static void internal_snapshot_prepare(BlkActionState *common,
1480 Error **errp)
1481 {
1482 Error *local_err = NULL;
1483 const char *device;
1484 const char *name;
1485 BlockDriverState *bs;
1486 QEMUSnapshotInfo old_sn, *sn;
1487 bool ret;
1488 qemu_timeval tv;
1489 BlockdevSnapshotInternal *internal;
1490 InternalSnapshotState *state;
1491 int ret1;
1492
1493 g_assert(common->action->type ==
1494 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1495 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1496 state = DO_UPCAST(InternalSnapshotState, common, common);
1497
1498 /* 1. parse input */
1499 device = internal->device;
1500 name = internal->name;
1501
1502 /* 2. check for validation */
1503 if (action_check_completion_mode(common, errp) < 0) {
1504 return;
1505 }
1506
1507 bs = qmp_get_root_bs(device, errp);
1508 if (!bs) {
1509 return;
1510 }
1511
1512 /* AioContext is released in .clean() */
1513 state->aio_context = bdrv_get_aio_context(bs);
1514 aio_context_acquire(state->aio_context);
1515
1516 state->bs = bs;
1517 bdrv_drained_begin(bs);
1518
1519 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1520 return;
1521 }
1522
1523 if (bdrv_is_read_only(bs)) {
1524 error_setg(errp, "Device '%s' is read only", device);
1525 return;
1526 }
1527
1528 if (!bdrv_can_snapshot(bs)) {
1529 error_setg(errp, "Block format '%s' used by device '%s' "
1530 "does not support internal snapshots",
1531 bs->drv->format_name, device);
1532 return;
1533 }
1534
1535 if (!strlen(name)) {
1536 error_setg(errp, "Name is empty");
1537 return;
1538 }
1539
1540 /* check whether a snapshot with name exist */
1541 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1542 &local_err);
1543 if (local_err) {
1544 error_propagate(errp, local_err);
1545 return;
1546 } else if (ret) {
1547 error_setg(errp,
1548 "Snapshot with name '%s' already exists on device '%s'",
1549 name, device);
1550 return;
1551 }
1552
1553 /* 3. take the snapshot */
1554 sn = &state->sn;
1555 pstrcpy(sn->name, sizeof(sn->name), name);
1556 qemu_gettimeofday(&tv);
1557 sn->date_sec = tv.tv_sec;
1558 sn->date_nsec = tv.tv_usec * 1000;
1559 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1560
1561 ret1 = bdrv_snapshot_create(bs, sn);
1562 if (ret1 < 0) {
1563 error_setg_errno(errp, -ret1,
1564 "Failed to create snapshot '%s' on device '%s'",
1565 name, device);
1566 return;
1567 }
1568
1569 /* 4. succeed, mark a snapshot is created */
1570 state->created = true;
1571 }
1572
1573 static void internal_snapshot_abort(BlkActionState *common)
1574 {
1575 InternalSnapshotState *state =
1576 DO_UPCAST(InternalSnapshotState, common, common);
1577 BlockDriverState *bs = state->bs;
1578 QEMUSnapshotInfo *sn = &state->sn;
1579 Error *local_error = NULL;
1580
1581 if (!state->created) {
1582 return;
1583 }
1584
1585 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1586 error_reportf_err(local_error,
1587 "Failed to delete snapshot with id '%s' and "
1588 "name '%s' on device '%s' in abort: ",
1589 sn->id_str, sn->name,
1590 bdrv_get_device_name(bs));
1591 }
1592 }
1593
1594 static void internal_snapshot_clean(BlkActionState *common)
1595 {
1596 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1597 common, common);
1598
1599 if (state->aio_context) {
1600 if (state->bs) {
1601 bdrv_drained_end(state->bs);
1602 }
1603 aio_context_release(state->aio_context);
1604 }
1605 }
1606
1607 /* external snapshot private data */
1608 typedef struct ExternalSnapshotState {
1609 BlkActionState common;
1610 BlockDriverState *old_bs;
1611 BlockDriverState *new_bs;
1612 AioContext *aio_context;
1613 } ExternalSnapshotState;
1614
1615 static void external_snapshot_prepare(BlkActionState *common,
1616 Error **errp)
1617 {
1618 int flags = 0;
1619 QDict *options = NULL;
1620 Error *local_err = NULL;
1621 /* Device and node name of the image to generate the snapshot from */
1622 const char *device;
1623 const char *node_name;
1624 /* Reference to the new image (for 'blockdev-snapshot') */
1625 const char *snapshot_ref;
1626 /* File name of the new image (for 'blockdev-snapshot-sync') */
1627 const char *new_image_file;
1628 ExternalSnapshotState *state =
1629 DO_UPCAST(ExternalSnapshotState, common, common);
1630 TransactionAction *action = common->action;
1631
1632 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1633 * purpose but a different set of parameters */
1634 switch (action->type) {
1635 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1636 {
1637 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1638 device = s->node;
1639 node_name = s->node;
1640 new_image_file = NULL;
1641 snapshot_ref = s->overlay;
1642 }
1643 break;
1644 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1645 {
1646 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1647 device = s->has_device ? s->device : NULL;
1648 node_name = s->has_node_name ? s->node_name : NULL;
1649 new_image_file = s->snapshot_file;
1650 snapshot_ref = NULL;
1651 }
1652 break;
1653 default:
1654 g_assert_not_reached();
1655 }
1656
1657 /* start processing */
1658 if (action_check_completion_mode(common, errp) < 0) {
1659 return;
1660 }
1661
1662 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1663 if (!state->old_bs) {
1664 return;
1665 }
1666
1667 /* Acquire AioContext now so any threads operating on old_bs stop */
1668 state->aio_context = bdrv_get_aio_context(state->old_bs);
1669 aio_context_acquire(state->aio_context);
1670 bdrv_drained_begin(state->old_bs);
1671
1672 if (!bdrv_is_inserted(state->old_bs)) {
1673 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1674 return;
1675 }
1676
1677 if (bdrv_op_is_blocked(state->old_bs,
1678 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1679 return;
1680 }
1681
1682 if (!bdrv_is_read_only(state->old_bs)) {
1683 if (bdrv_flush(state->old_bs)) {
1684 error_setg(errp, QERR_IO_ERROR);
1685 return;
1686 }
1687 }
1688
1689 if (!bdrv_is_first_non_filter(state->old_bs)) {
1690 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1691 return;
1692 }
1693
1694 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1695 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1696 const char *format = s->has_format ? s->format : "qcow2";
1697 enum NewImageMode mode;
1698 const char *snapshot_node_name =
1699 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1700
1701 if (node_name && !snapshot_node_name) {
1702 error_setg(errp, "New snapshot node name missing");
1703 return;
1704 }
1705
1706 if (snapshot_node_name &&
1707 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1708 error_setg(errp, "New snapshot node name already in use");
1709 return;
1710 }
1711
1712 flags = state->old_bs->open_flags;
1713 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ);
1714
1715 /* create new image w/backing file */
1716 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1717 if (mode != NEW_IMAGE_MODE_EXISTING) {
1718 int64_t size = bdrv_getlength(state->old_bs);
1719 if (size < 0) {
1720 error_setg_errno(errp, -size, "bdrv_getlength failed");
1721 return;
1722 }
1723 bdrv_img_create(new_image_file, format,
1724 state->old_bs->filename,
1725 state->old_bs->drv->format_name,
1726 NULL, size, flags, &local_err, false);
1727 if (local_err) {
1728 error_propagate(errp, local_err);
1729 return;
1730 }
1731 }
1732
1733 options = qdict_new();
1734 if (s->has_snapshot_node_name) {
1735 qdict_put(options, "node-name",
1736 qstring_from_str(snapshot_node_name));
1737 }
1738 qdict_put(options, "driver", qstring_from_str(format));
1739
1740 flags |= BDRV_O_NO_BACKING;
1741 }
1742
1743 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1744 errp);
1745 /* We will manually add the backing_hd field to the bs later */
1746 if (!state->new_bs) {
1747 return;
1748 }
1749
1750 if (bdrv_has_blk(state->new_bs)) {
1751 error_setg(errp, "The snapshot is already in use");
1752 return;
1753 }
1754
1755 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1756 errp)) {
1757 return;
1758 }
1759
1760 if (state->new_bs->backing != NULL) {
1761 error_setg(errp, "The snapshot already has a backing image");
1762 return;
1763 }
1764
1765 if (!state->new_bs->drv->supports_backing) {
1766 error_setg(errp, "The snapshot does not support backing images");
1767 }
1768 }
1769
1770 static void external_snapshot_commit(BlkActionState *common)
1771 {
1772 ExternalSnapshotState *state =
1773 DO_UPCAST(ExternalSnapshotState, common, common);
1774
1775 bdrv_set_aio_context(state->new_bs, state->aio_context);
1776
1777 /* This removes our old bs and adds the new bs */
1778 bdrv_append(state->new_bs, state->old_bs);
1779 /* We don't need (or want) to use the transactional
1780 * bdrv_reopen_multiple() across all the entries at once, because we
1781 * don't want to abort all of them if one of them fails the reopen */
1782 if (!state->old_bs->copy_on_read) {
1783 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1784 NULL);
1785 }
1786 }
1787
1788 static void external_snapshot_abort(BlkActionState *common)
1789 {
1790 ExternalSnapshotState *state =
1791 DO_UPCAST(ExternalSnapshotState, common, common);
1792 if (state->new_bs) {
1793 bdrv_unref(state->new_bs);
1794 }
1795 }
1796
1797 static void external_snapshot_clean(BlkActionState *common)
1798 {
1799 ExternalSnapshotState *state =
1800 DO_UPCAST(ExternalSnapshotState, common, common);
1801 if (state->aio_context) {
1802 bdrv_drained_end(state->old_bs);
1803 aio_context_release(state->aio_context);
1804 }
1805 }
1806
1807 typedef struct DriveBackupState {
1808 BlkActionState common;
1809 BlockDriverState *bs;
1810 AioContext *aio_context;
1811 BlockJob *job;
1812 } DriveBackupState;
1813
1814 static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
1815 Error **errp);
1816
1817 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1818 {
1819 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1820 BlockDriverState *bs;
1821 DriveBackup *backup;
1822 Error *local_err = NULL;
1823
1824 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1825 backup = common->action->u.drive_backup.data;
1826
1827 bs = qmp_get_root_bs(backup->device, errp);
1828 if (!bs) {
1829 return;
1830 }
1831
1832 /* AioContext is released in .clean() */
1833 state->aio_context = bdrv_get_aio_context(bs);
1834 aio_context_acquire(state->aio_context);
1835 bdrv_drained_begin(bs);
1836 state->bs = bs;
1837
1838 state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
1839 if (local_err) {
1840 error_propagate(errp, local_err);
1841 return;
1842 }
1843 }
1844
1845 static void drive_backup_commit(BlkActionState *common)
1846 {
1847 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1848 assert(state->job);
1849 block_job_start(state->job);
1850 }
1851
1852 static void drive_backup_abort(BlkActionState *common)
1853 {
1854 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1855
1856 if (state->job) {
1857 block_job_cancel_sync(state->job);
1858 }
1859 }
1860
1861 static void drive_backup_clean(BlkActionState *common)
1862 {
1863 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1864
1865 if (state->aio_context) {
1866 bdrv_drained_end(state->bs);
1867 aio_context_release(state->aio_context);
1868 }
1869 }
1870
1871 typedef struct BlockdevBackupState {
1872 BlkActionState common;
1873 BlockDriverState *bs;
1874 BlockJob *job;
1875 AioContext *aio_context;
1876 } BlockdevBackupState;
1877
1878 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn,
1879 Error **errp);
1880
1881 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1882 {
1883 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1884 BlockdevBackup *backup;
1885 BlockDriverState *bs, *target;
1886 Error *local_err = NULL;
1887
1888 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1889 backup = common->action->u.blockdev_backup.data;
1890
1891 bs = qmp_get_root_bs(backup->device, errp);
1892 if (!bs) {
1893 return;
1894 }
1895
1896 target = bdrv_lookup_bs(backup->target, backup->target, errp);
1897 if (!target) {
1898 return;
1899 }
1900
1901 /* AioContext is released in .clean() */
1902 state->aio_context = bdrv_get_aio_context(bs);
1903 if (state->aio_context != bdrv_get_aio_context(target)) {
1904 state->aio_context = NULL;
1905 error_setg(errp, "Backup between two IO threads is not implemented");
1906 return;
1907 }
1908 aio_context_acquire(state->aio_context);
1909 state->bs = bs;
1910 bdrv_drained_begin(state->bs);
1911
1912 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
1913 if (local_err) {
1914 error_propagate(errp, local_err);
1915 return;
1916 }
1917 }
1918
1919 static void blockdev_backup_commit(BlkActionState *common)
1920 {
1921 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1922 assert(state->job);
1923 block_job_start(state->job);
1924 }
1925
1926 static void blockdev_backup_abort(BlkActionState *common)
1927 {
1928 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1929
1930 if (state->job) {
1931 block_job_cancel_sync(state->job);
1932 }
1933 }
1934
1935 static void blockdev_backup_clean(BlkActionState *common)
1936 {
1937 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1938
1939 if (state->aio_context) {
1940 bdrv_drained_end(state->bs);
1941 aio_context_release(state->aio_context);
1942 }
1943 }
1944
1945 typedef struct BlockDirtyBitmapState {
1946 BlkActionState common;
1947 BdrvDirtyBitmap *bitmap;
1948 BlockDriverState *bs;
1949 AioContext *aio_context;
1950 HBitmap *backup;
1951 bool prepared;
1952 } BlockDirtyBitmapState;
1953
1954 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
1955 Error **errp)
1956 {
1957 Error *local_err = NULL;
1958 BlockDirtyBitmapAdd *action;
1959 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1960 common, common);
1961
1962 if (action_check_completion_mode(common, errp) < 0) {
1963 return;
1964 }
1965
1966 action = common->action->u.block_dirty_bitmap_add.data;
1967 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1968 qmp_block_dirty_bitmap_add(action->node, action->name,
1969 action->has_granularity, action->granularity,
1970 &local_err);
1971
1972 if (!local_err) {
1973 state->prepared = true;
1974 } else {
1975 error_propagate(errp, local_err);
1976 }
1977 }
1978
1979 static void block_dirty_bitmap_add_abort(BlkActionState *common)
1980 {
1981 BlockDirtyBitmapAdd *action;
1982 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1983 common, common);
1984
1985 action = common->action->u.block_dirty_bitmap_add.data;
1986 /* Should not be able to fail: IF the bitmap was added via .prepare(),
1987 * then the node reference and bitmap name must have been valid.
1988 */
1989 if (state->prepared) {
1990 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
1991 }
1992 }
1993
1994 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
1995 Error **errp)
1996 {
1997 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1998 common, common);
1999 BlockDirtyBitmap *action;
2000
2001 if (action_check_completion_mode(common, errp) < 0) {
2002 return;
2003 }
2004
2005 action = common->action->u.block_dirty_bitmap_clear.data;
2006 state->bitmap = block_dirty_bitmap_lookup(action->node,
2007 action->name,
2008 &state->bs,
2009 &state->aio_context,
2010 errp);
2011 if (!state->bitmap) {
2012 return;
2013 }
2014
2015 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2016 error_setg(errp, "Cannot modify a frozen bitmap");
2017 return;
2018 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2019 error_setg(errp, "Cannot clear a disabled bitmap");
2020 return;
2021 }
2022
2023 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2024 /* AioContext is released in .clean() */
2025 }
2026
2027 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2028 {
2029 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2030 common, common);
2031
2032 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2033 }
2034
2035 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2036 {
2037 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2038 common, common);
2039
2040 hbitmap_free(state->backup);
2041 }
2042
2043 static void block_dirty_bitmap_clear_clean(BlkActionState *common)
2044 {
2045 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2046 common, common);
2047
2048 if (state->aio_context) {
2049 aio_context_release(state->aio_context);
2050 }
2051 }
2052
2053 static void abort_prepare(BlkActionState *common, Error **errp)
2054 {
2055 error_setg(errp, "Transaction aborted using Abort action");
2056 }
2057
2058 static void abort_commit(BlkActionState *common)
2059 {
2060 g_assert_not_reached(); /* this action never succeeds */
2061 }
2062
2063 static const BlkActionOps actions[] = {
2064 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2065 .instance_size = sizeof(ExternalSnapshotState),
2066 .prepare = external_snapshot_prepare,
2067 .commit = external_snapshot_commit,
2068 .abort = external_snapshot_abort,
2069 .clean = external_snapshot_clean,
2070 },
2071 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2072 .instance_size = sizeof(ExternalSnapshotState),
2073 .prepare = external_snapshot_prepare,
2074 .commit = external_snapshot_commit,
2075 .abort = external_snapshot_abort,
2076 .clean = external_snapshot_clean,
2077 },
2078 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2079 .instance_size = sizeof(DriveBackupState),
2080 .prepare = drive_backup_prepare,
2081 .commit = drive_backup_commit,
2082 .abort = drive_backup_abort,
2083 .clean = drive_backup_clean,
2084 },
2085 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2086 .instance_size = sizeof(BlockdevBackupState),
2087 .prepare = blockdev_backup_prepare,
2088 .commit = blockdev_backup_commit,
2089 .abort = blockdev_backup_abort,
2090 .clean = blockdev_backup_clean,
2091 },
2092 [TRANSACTION_ACTION_KIND_ABORT] = {
2093 .instance_size = sizeof(BlkActionState),
2094 .prepare = abort_prepare,
2095 .commit = abort_commit,
2096 },
2097 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2098 .instance_size = sizeof(InternalSnapshotState),
2099 .prepare = internal_snapshot_prepare,
2100 .abort = internal_snapshot_abort,
2101 .clean = internal_snapshot_clean,
2102 },
2103 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2104 .instance_size = sizeof(BlockDirtyBitmapState),
2105 .prepare = block_dirty_bitmap_add_prepare,
2106 .abort = block_dirty_bitmap_add_abort,
2107 },
2108 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2109 .instance_size = sizeof(BlockDirtyBitmapState),
2110 .prepare = block_dirty_bitmap_clear_prepare,
2111 .commit = block_dirty_bitmap_clear_commit,
2112 .abort = block_dirty_bitmap_clear_abort,
2113 .clean = block_dirty_bitmap_clear_clean,
2114 }
2115 };
2116
2117 /**
2118 * Allocate a TransactionProperties structure if necessary, and fill
2119 * that structure with desired defaults if they are unset.
2120 */
2121 static TransactionProperties *get_transaction_properties(
2122 TransactionProperties *props)
2123 {
2124 if (!props) {
2125 props = g_new0(TransactionProperties, 1);
2126 }
2127
2128 if (!props->has_completion_mode) {
2129 props->has_completion_mode = true;
2130 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2131 }
2132
2133 return props;
2134 }
2135
2136 /*
2137 * 'Atomic' group operations. The operations are performed as a set, and if
2138 * any fail then we roll back all operations in the group.
2139 */
2140 void qmp_transaction(TransactionActionList *dev_list,
2141 bool has_props,
2142 struct TransactionProperties *props,
2143 Error **errp)
2144 {
2145 TransactionActionList *dev_entry = dev_list;
2146 BlockJobTxn *block_job_txn = NULL;
2147 BlkActionState *state, *next;
2148 Error *local_err = NULL;
2149
2150 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2151 QSIMPLEQ_INIT(&snap_bdrv_states);
2152
2153 /* Does this transaction get canceled as a group on failure?
2154 * If not, we don't really need to make a BlockJobTxn.
2155 */
2156 props = get_transaction_properties(props);
2157 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2158 block_job_txn = block_job_txn_new();
2159 }
2160
2161 /* drain all i/o before any operations */
2162 bdrv_drain_all();
2163
2164 /* We don't do anything in this loop that commits us to the operations */
2165 while (NULL != dev_entry) {
2166 TransactionAction *dev_info = NULL;
2167 const BlkActionOps *ops;
2168
2169 dev_info = dev_entry->value;
2170 dev_entry = dev_entry->next;
2171
2172 assert(dev_info->type < ARRAY_SIZE(actions));
2173
2174 ops = &actions[dev_info->type];
2175 assert(ops->instance_size > 0);
2176
2177 state = g_malloc0(ops->instance_size);
2178 state->ops = ops;
2179 state->action = dev_info;
2180 state->block_job_txn = block_job_txn;
2181 state->txn_props = props;
2182 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2183
2184 state->ops->prepare(state, &local_err);
2185 if (local_err) {
2186 error_propagate(errp, local_err);
2187 goto delete_and_fail;
2188 }
2189 }
2190
2191 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2192 if (state->ops->commit) {
2193 state->ops->commit(state);
2194 }
2195 }
2196
2197 /* success */
2198 goto exit;
2199
2200 delete_and_fail:
2201 /* failure, and it is all-or-none; roll back all operations */
2202 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2203 if (state->ops->abort) {
2204 state->ops->abort(state);
2205 }
2206 }
2207 exit:
2208 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2209 if (state->ops->clean) {
2210 state->ops->clean(state);
2211 }
2212 g_free(state);
2213 }
2214 if (!has_props) {
2215 qapi_free_TransactionProperties(props);
2216 }
2217 block_job_txn_unref(block_job_txn);
2218 }
2219
2220 void qmp_eject(bool has_device, const char *device,
2221 bool has_id, const char *id,
2222 bool has_force, bool force, Error **errp)
2223 {
2224 Error *local_err = NULL;
2225 int rc;
2226
2227 if (!has_force) {
2228 force = false;
2229 }
2230
2231 rc = do_open_tray(has_device ? device : NULL,
2232 has_id ? id : NULL,
2233 force, &local_err);
2234 if (rc && rc != -ENOSYS) {
2235 error_propagate(errp, local_err);
2236 return;
2237 }
2238 error_free(local_err);
2239
2240 qmp_x_blockdev_remove_medium(has_device, device, has_id, id, errp);
2241 }
2242
2243 void qmp_block_passwd(bool has_device, const char *device,
2244 bool has_node_name, const char *node_name,
2245 const char *password, Error **errp)
2246 {
2247 Error *local_err = NULL;
2248 BlockDriverState *bs;
2249 AioContext *aio_context;
2250
2251 bs = bdrv_lookup_bs(has_device ? device : NULL,
2252 has_node_name ? node_name : NULL,
2253 &local_err);
2254 if (local_err) {
2255 error_propagate(errp, local_err);
2256 return;
2257 }
2258
2259 aio_context = bdrv_get_aio_context(bs);
2260 aio_context_acquire(aio_context);
2261
2262 bdrv_add_key(bs, password, errp);
2263
2264 aio_context_release(aio_context);
2265 }
2266
2267 /*
2268 * Attempt to open the tray of @device.
2269 * If @force, ignore its tray lock.
2270 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2271 * On error, store an error through @errp and return -errno.
2272 * If @device does not exist, return -ENODEV.
2273 * If it has no removable media, return -ENOTSUP.
2274 * If it has no tray, return -ENOSYS.
2275 * If the guest was asked to open the tray, return -EINPROGRESS.
2276 * Else, return 0.
2277 */
2278 static int do_open_tray(const char *blk_name, const char *qdev_id,
2279 bool force, Error **errp)
2280 {
2281 BlockBackend *blk;
2282 const char *device = qdev_id ?: blk_name;
2283 bool locked;
2284
2285 blk = qmp_get_blk(blk_name, qdev_id, errp);
2286 if (!blk) {
2287 return -ENODEV;
2288 }
2289
2290 if (!blk_dev_has_removable_media(blk)) {
2291 error_setg(errp, "Device '%s' is not removable", device);
2292 return -ENOTSUP;
2293 }
2294
2295 if (!blk_dev_has_tray(blk)) {
2296 error_setg(errp, "Device '%s' does not have a tray", device);
2297 return -ENOSYS;
2298 }
2299
2300 if (blk_dev_is_tray_open(blk)) {
2301 return 0;
2302 }
2303
2304 locked = blk_dev_is_medium_locked(blk);
2305 if (locked) {
2306 blk_dev_eject_request(blk, force);
2307 }
2308
2309 if (!locked || force) {
2310 blk_dev_change_media_cb(blk, false);
2311 }
2312
2313 if (locked && !force) {
2314 error_setg(errp, "Device '%s' is locked and force was not specified, "
2315 "wait for tray to open and try again", device);
2316 return -EINPROGRESS;
2317 }
2318
2319 return 0;
2320 }
2321
2322 void qmp_blockdev_open_tray(bool has_device, const char *device,
2323 bool has_id, const char *id,
2324 bool has_force, bool force,
2325 Error **errp)
2326 {
2327 Error *local_err = NULL;
2328 int rc;
2329
2330 if (!has_force) {
2331 force = false;
2332 }
2333 rc = do_open_tray(has_device ? device : NULL,
2334 has_id ? id : NULL,
2335 force, &local_err);
2336 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
2337 error_propagate(errp, local_err);
2338 return;
2339 }
2340 error_free(local_err);
2341 }
2342
2343 void qmp_blockdev_close_tray(bool has_device, const char *device,
2344 bool has_id, const char *id,
2345 Error **errp)
2346 {
2347 BlockBackend *blk;
2348
2349 device = has_device ? device : NULL;
2350 id = has_id ? id : NULL;
2351
2352 blk = qmp_get_blk(device, id, errp);
2353 if (!blk) {
2354 return;
2355 }
2356
2357 if (!blk_dev_has_removable_media(blk)) {
2358 error_setg(errp, "Device '%s' is not removable", device ?: id);
2359 return;
2360 }
2361
2362 if (!blk_dev_has_tray(blk)) {
2363 /* Ignore this command on tray-less devices */
2364 return;
2365 }
2366
2367 if (!blk_dev_is_tray_open(blk)) {
2368 return;
2369 }
2370
2371 blk_dev_change_media_cb(blk, true);
2372 }
2373
2374 void qmp_x_blockdev_remove_medium(bool has_device, const char *device,
2375 bool has_id, const char *id, Error **errp)
2376 {
2377 BlockBackend *blk;
2378 BlockDriverState *bs;
2379 AioContext *aio_context;
2380 bool has_attached_device;
2381
2382 device = has_device ? device : NULL;
2383 id = has_id ? id : NULL;
2384
2385 blk = qmp_get_blk(device, id, errp);
2386 if (!blk) {
2387 return;
2388 }
2389
2390 /* For BBs without a device, we can exchange the BDS tree at will */
2391 has_attached_device = blk_get_attached_dev(blk);
2392
2393 if (has_attached_device && !blk_dev_has_removable_media(blk)) {
2394 error_setg(errp, "Device '%s' is not removable", device ?: id);
2395 return;
2396 }
2397
2398 if (has_attached_device && blk_dev_has_tray(blk) &&
2399 !blk_dev_is_tray_open(blk))
2400 {
2401 error_setg(errp, "Tray of device '%s' is not open", device ?: id);
2402 return;
2403 }
2404
2405 bs = blk_bs(blk);
2406 if (!bs) {
2407 return;
2408 }
2409
2410 aio_context = bdrv_get_aio_context(bs);
2411 aio_context_acquire(aio_context);
2412
2413 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2414 goto out;
2415 }
2416
2417 blk_remove_bs(blk);
2418
2419 if (!blk_dev_has_tray(blk)) {
2420 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2421 * called at all); therefore, the medium needs to be ejected here.
2422 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2423 * value passed here (i.e. false). */
2424 blk_dev_change_media_cb(blk, false);
2425 }
2426
2427 out:
2428 aio_context_release(aio_context);
2429 }
2430
2431 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2432 BlockDriverState *bs, Error **errp)
2433 {
2434 bool has_device;
2435
2436 /* For BBs without a device, we can exchange the BDS tree at will */
2437 has_device = blk_get_attached_dev(blk);
2438
2439 if (has_device && !blk_dev_has_removable_media(blk)) {
2440 error_setg(errp, "Device is not removable");
2441 return;
2442 }
2443
2444 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2445 error_setg(errp, "Tray of the device is not open");
2446 return;
2447 }
2448
2449 if (blk_bs(blk)) {
2450 error_setg(errp, "There already is a medium in the device");
2451 return;
2452 }
2453
2454 blk_insert_bs(blk, bs);
2455
2456 if (!blk_dev_has_tray(blk)) {
2457 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2458 * called at all); therefore, the medium needs to be pushed into the
2459 * slot here.
2460 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2461 * value passed here (i.e. true). */
2462 blk_dev_change_media_cb(blk, true);
2463 }
2464 }
2465
2466 void qmp_x_blockdev_insert_medium(bool has_device, const char *device,
2467 bool has_id, const char *id,
2468 const char *node_name, Error **errp)
2469 {
2470 BlockBackend *blk;
2471 BlockDriverState *bs;
2472
2473 blk = qmp_get_blk(has_device ? device : NULL,
2474 has_id ? id : NULL,
2475 errp);
2476 if (!blk) {
2477 return;
2478 }
2479
2480 bs = bdrv_find_node(node_name);
2481 if (!bs) {
2482 error_setg(errp, "Node '%s' not found", node_name);
2483 return;
2484 }
2485
2486 if (bdrv_has_blk(bs)) {
2487 error_setg(errp, "Node '%s' is already in use", node_name);
2488 return;
2489 }
2490
2491 qmp_blockdev_insert_anon_medium(blk, bs, errp);
2492 }
2493
2494 void qmp_blockdev_change_medium(bool has_device, const char *device,
2495 bool has_id, const char *id,
2496 const char *filename,
2497 bool has_format, const char *format,
2498 bool has_read_only,
2499 BlockdevChangeReadOnlyMode read_only,
2500 Error **errp)
2501 {
2502 BlockBackend *blk;
2503 BlockDriverState *medium_bs = NULL;
2504 int bdrv_flags;
2505 bool detect_zeroes;
2506 int rc;
2507 QDict *options = NULL;
2508 Error *err = NULL;
2509
2510 blk = qmp_get_blk(has_device ? device : NULL,
2511 has_id ? id : NULL,
2512 errp);
2513 if (!blk) {
2514 goto fail;
2515 }
2516
2517 if (blk_bs(blk)) {
2518 blk_update_root_state(blk);
2519 }
2520
2521 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2522 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2523 BDRV_O_PROTOCOL);
2524
2525 if (!has_read_only) {
2526 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2527 }
2528
2529 switch (read_only) {
2530 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2531 break;
2532
2533 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2534 bdrv_flags &= ~BDRV_O_RDWR;
2535 break;
2536
2537 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2538 bdrv_flags |= BDRV_O_RDWR;
2539 break;
2540
2541 default:
2542 abort();
2543 }
2544
2545 options = qdict_new();
2546 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2547 qdict_put(options, "detect-zeroes",
2548 qstring_from_str(detect_zeroes ? "on" : "off"));
2549
2550 if (has_format) {
2551 qdict_put(options, "driver", qstring_from_str(format));
2552 }
2553
2554 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
2555 if (!medium_bs) {
2556 goto fail;
2557 }
2558
2559 bdrv_add_key(medium_bs, NULL, &err);
2560 if (err) {
2561 error_propagate(errp, err);
2562 goto fail;
2563 }
2564
2565 rc = do_open_tray(has_device ? device : NULL,
2566 has_id ? id : NULL,
2567 false, &err);
2568 if (rc && rc != -ENOSYS) {
2569 error_propagate(errp, err);
2570 goto fail;
2571 }
2572 error_free(err);
2573 err = NULL;
2574
2575 qmp_x_blockdev_remove_medium(has_device, device, has_id, id, &err);
2576 if (err) {
2577 error_propagate(errp, err);
2578 goto fail;
2579 }
2580
2581 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2582 if (err) {
2583 error_propagate(errp, err);
2584 goto fail;
2585 }
2586
2587 qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2588
2589 fail:
2590 /* If the medium has been inserted, the device has its own reference, so
2591 * ours must be relinquished; and if it has not been inserted successfully,
2592 * the reference must be relinquished anyway */
2593 bdrv_unref(medium_bs);
2594 }
2595
2596 /* throttling disk I/O limits */
2597 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2598 {
2599 ThrottleConfig cfg;
2600 BlockDriverState *bs;
2601 BlockBackend *blk;
2602 AioContext *aio_context;
2603
2604 blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
2605 arg->has_id ? arg->id : NULL,
2606 errp);
2607 if (!blk) {
2608 return;
2609 }
2610
2611 aio_context = blk_get_aio_context(blk);
2612 aio_context_acquire(aio_context);
2613
2614 bs = blk_bs(blk);
2615 if (!bs) {
2616 error_setg(errp, "Device has no medium");
2617 goto out;
2618 }
2619
2620 throttle_config_init(&cfg);
2621 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
2622 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd;
2623 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
2624
2625 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
2626 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd;
2627 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
2628
2629 if (arg->has_bps_max) {
2630 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2631 }
2632 if (arg->has_bps_rd_max) {
2633 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2634 }
2635 if (arg->has_bps_wr_max) {
2636 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2637 }
2638 if (arg->has_iops_max) {
2639 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2640 }
2641 if (arg->has_iops_rd_max) {
2642 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2643 }
2644 if (arg->has_iops_wr_max) {
2645 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2646 }
2647
2648 if (arg->has_bps_max_length) {
2649 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2650 }
2651 if (arg->has_bps_rd_max_length) {
2652 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2653 }
2654 if (arg->has_bps_wr_max_length) {
2655 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2656 }
2657 if (arg->has_iops_max_length) {
2658 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2659 }
2660 if (arg->has_iops_rd_max_length) {
2661 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2662 }
2663 if (arg->has_iops_wr_max_length) {
2664 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2665 }
2666
2667 if (arg->has_iops_size) {
2668 cfg.op_size = arg->iops_size;
2669 }
2670
2671 if (!throttle_is_valid(&cfg, errp)) {
2672 goto out;
2673 }
2674
2675 if (throttle_enabled(&cfg)) {
2676 /* Enable I/O limits if they're not enabled yet, otherwise
2677 * just update the throttling group. */
2678 if (!blk_get_public(blk)->throttle_state) {
2679 blk_io_limits_enable(blk,
2680 arg->has_group ? arg->group :
2681 arg->has_device ? arg->device :
2682 arg->id);
2683 } else if (arg->has_group) {
2684 blk_io_limits_update_group(blk, arg->group);
2685 }
2686 /* Set the new throttling configuration */
2687 blk_set_io_limits(blk, &cfg);
2688 } else if (blk_get_public(blk)->throttle_state) {
2689 /* If all throttling settings are set to 0, disable I/O limits */
2690 blk_io_limits_disable(blk);
2691 }
2692
2693 out:
2694 aio_context_release(aio_context);
2695 }
2696
2697 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2698 bool has_granularity, uint32_t granularity,
2699 Error **errp)
2700 {
2701 AioContext *aio_context;
2702 BlockDriverState *bs;
2703
2704 if (!name || name[0] == '\0') {
2705 error_setg(errp, "Bitmap name cannot be empty");
2706 return;
2707 }
2708
2709 bs = bdrv_lookup_bs(node, node, errp);
2710 if (!bs) {
2711 return;
2712 }
2713
2714 aio_context = bdrv_get_aio_context(bs);
2715 aio_context_acquire(aio_context);
2716
2717 if (has_granularity) {
2718 if (granularity < 512 || !is_power_of_2(granularity)) {
2719 error_setg(errp, "Granularity must be power of 2 "
2720 "and at least 512");
2721 goto out;
2722 }
2723 } else {
2724 /* Default to cluster size, if available: */
2725 granularity = bdrv_get_default_bitmap_granularity(bs);
2726 }
2727
2728 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2729
2730 out:
2731 aio_context_release(aio_context);
2732 }
2733
2734 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2735 Error **errp)
2736 {
2737 AioContext *aio_context;
2738 BlockDriverState *bs;
2739 BdrvDirtyBitmap *bitmap;
2740
2741 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2742 if (!bitmap || !bs) {
2743 return;
2744 }
2745
2746 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2747 error_setg(errp,
2748 "Bitmap '%s' is currently frozen and cannot be removed",
2749 name);
2750 goto out;
2751 }
2752 bdrv_dirty_bitmap_make_anon(bitmap);
2753 bdrv_release_dirty_bitmap(bs, bitmap);
2754
2755 out:
2756 aio_context_release(aio_context);
2757 }
2758
2759 /**
2760 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2761 * immediately after a full backup operation.
2762 */
2763 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2764 Error **errp)
2765 {
2766 AioContext *aio_context;
2767 BdrvDirtyBitmap *bitmap;
2768 BlockDriverState *bs;
2769
2770 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2771 if (!bitmap || !bs) {
2772 return;
2773 }
2774
2775 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2776 error_setg(errp,
2777 "Bitmap '%s' is currently frozen and cannot be modified",
2778 name);
2779 goto out;
2780 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2781 error_setg(errp,
2782 "Bitmap '%s' is currently disabled and cannot be cleared",
2783 name);
2784 goto out;
2785 }
2786
2787 bdrv_clear_dirty_bitmap(bitmap, NULL);
2788
2789 out:
2790 aio_context_release(aio_context);
2791 }
2792
2793 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2794 {
2795 const char *id = qdict_get_str(qdict, "id");
2796 BlockBackend *blk;
2797 BlockDriverState *bs;
2798 AioContext *aio_context;
2799 Error *local_err = NULL;
2800
2801 bs = bdrv_find_node(id);
2802 if (bs) {
2803 qmp_x_blockdev_del(id, &local_err);
2804 if (local_err) {
2805 error_report_err(local_err);
2806 }
2807 return;
2808 }
2809
2810 blk = blk_by_name(id);
2811 if (!blk) {
2812 error_report("Device '%s' not found", id);
2813 return;
2814 }
2815
2816 if (!blk_legacy_dinfo(blk)) {
2817 error_report("Deleting device added with blockdev-add"
2818 " is not supported");
2819 return;
2820 }
2821
2822 aio_context = blk_get_aio_context(blk);
2823 aio_context_acquire(aio_context);
2824
2825 bs = blk_bs(blk);
2826 if (bs) {
2827 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2828 error_report_err(local_err);
2829 aio_context_release(aio_context);
2830 return;
2831 }
2832
2833 blk_remove_bs(blk);
2834 }
2835
2836 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2837 monitor_remove_blk(blk);
2838
2839 /* If this BlockBackend has a device attached to it, its refcount will be
2840 * decremented when the device is removed; otherwise we have to do so here.
2841 */
2842 if (blk_get_attached_dev(blk)) {
2843 /* Further I/O must not pause the guest */
2844 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2845 BLOCKDEV_ON_ERROR_REPORT);
2846 } else {
2847 blk_unref(blk);
2848 }
2849
2850 aio_context_release(aio_context);
2851 }
2852
2853 void qmp_block_resize(bool has_device, const char *device,
2854 bool has_node_name, const char *node_name,
2855 int64_t size, Error **errp)
2856 {
2857 Error *local_err = NULL;
2858 BlockDriverState *bs;
2859 AioContext *aio_context;
2860 int ret;
2861
2862 bs = bdrv_lookup_bs(has_device ? device : NULL,
2863 has_node_name ? node_name : NULL,
2864 &local_err);
2865 if (local_err) {
2866 error_propagate(errp, local_err);
2867 return;
2868 }
2869
2870 aio_context = bdrv_get_aio_context(bs);
2871 aio_context_acquire(aio_context);
2872
2873 if (!bdrv_is_first_non_filter(bs)) {
2874 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2875 goto out;
2876 }
2877
2878 if (size < 0) {
2879 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2880 goto out;
2881 }
2882
2883 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2884 error_setg(errp, QERR_DEVICE_IN_USE, device);
2885 goto out;
2886 }
2887
2888 /* complete all in-flight operations before resizing the device */
2889 bdrv_drain_all();
2890
2891 ret = bdrv_truncate(bs, size);
2892 switch (ret) {
2893 case 0:
2894 break;
2895 case -ENOMEDIUM:
2896 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2897 break;
2898 case -ENOTSUP:
2899 error_setg(errp, QERR_UNSUPPORTED);
2900 break;
2901 case -EACCES:
2902 error_setg(errp, "Device '%s' is read only", device);
2903 break;
2904 case -EBUSY:
2905 error_setg(errp, QERR_DEVICE_IN_USE, device);
2906 break;
2907 default:
2908 error_setg_errno(errp, -ret, "Could not resize");
2909 break;
2910 }
2911
2912 out:
2913 aio_context_release(aio_context);
2914 }
2915
2916 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
2917 bool has_base, const char *base,
2918 bool has_base_node, const char *base_node,
2919 bool has_backing_file, const char *backing_file,
2920 bool has_speed, int64_t speed,
2921 bool has_on_error, BlockdevOnError on_error,
2922 Error **errp)
2923 {
2924 BlockDriverState *bs, *iter;
2925 BlockDriverState *base_bs = NULL;
2926 AioContext *aio_context;
2927 Error *local_err = NULL;
2928 const char *base_name = NULL;
2929
2930 if (!has_on_error) {
2931 on_error = BLOCKDEV_ON_ERROR_REPORT;
2932 }
2933
2934 bs = bdrv_lookup_bs(device, device, errp);
2935 if (!bs) {
2936 return;
2937 }
2938
2939 aio_context = bdrv_get_aio_context(bs);
2940 aio_context_acquire(aio_context);
2941
2942 if (has_base && has_base_node) {
2943 error_setg(errp, "'base' and 'base-node' cannot be specified "
2944 "at the same time");
2945 goto out;
2946 }
2947
2948 if (has_base) {
2949 base_bs = bdrv_find_backing_image(bs, base);
2950 if (base_bs == NULL) {
2951 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2952 goto out;
2953 }
2954 assert(bdrv_get_aio_context(base_bs) == aio_context);
2955 base_name = base;
2956 }
2957
2958 if (has_base_node) {
2959 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2960 if (!base_bs) {
2961 goto out;
2962 }
2963 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
2964 error_setg(errp, "Node '%s' is not a backing image of '%s'",
2965 base_node, device);
2966 goto out;
2967 }
2968 assert(bdrv_get_aio_context(base_bs) == aio_context);
2969 base_name = base_bs->filename;
2970 }
2971
2972 /* Check for op blockers in the whole chain between bs and base */
2973 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
2974 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
2975 goto out;
2976 }
2977 }
2978
2979 /* if we are streaming the entire chain, the result will have no backing
2980 * file, and specifying one is therefore an error */
2981 if (base_bs == NULL && has_backing_file) {
2982 error_setg(errp, "backing file specified, but streaming the "
2983 "entire chain");
2984 goto out;
2985 }
2986
2987 /* backing_file string overrides base bs filename */
2988 base_name = has_backing_file ? backing_file : base_name;
2989
2990 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
2991 has_speed ? speed : 0, on_error, &local_err);
2992 if (local_err) {
2993 error_propagate(errp, local_err);
2994 goto out;
2995 }
2996
2997 trace_qmp_block_stream(bs, bs->job);
2998
2999 out:
3000 aio_context_release(aio_context);
3001 }
3002
3003 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3004 bool has_base, const char *base,
3005 bool has_top, const char *top,
3006 bool has_backing_file, const char *backing_file,
3007 bool has_speed, int64_t speed,
3008 Error **errp)
3009 {
3010 BlockDriverState *bs;
3011 BlockDriverState *iter;
3012 BlockDriverState *base_bs, *top_bs;
3013 AioContext *aio_context;
3014 Error *local_err = NULL;
3015 /* This will be part of the QMP command, if/when the
3016 * BlockdevOnError change for blkmirror makes it in
3017 */
3018 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3019
3020 if (!has_speed) {
3021 speed = 0;
3022 }
3023
3024 /* Important Note:
3025 * libvirt relies on the DeviceNotFound error class in order to probe for
3026 * live commit feature versions; for this to work, we must make sure to
3027 * perform the device lookup before any generic errors that may occur in a
3028 * scenario in which all optional arguments are omitted. */
3029 bs = qmp_get_root_bs(device, &local_err);
3030 if (!bs) {
3031 bs = bdrv_lookup_bs(device, device, NULL);
3032 if (!bs) {
3033 error_free(local_err);
3034 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3035 "Device '%s' not found", device);
3036 } else {
3037 error_propagate(errp, local_err);
3038 }
3039 return;
3040 }
3041
3042 aio_context = bdrv_get_aio_context(bs);
3043 aio_context_acquire(aio_context);
3044
3045 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3046 goto out;
3047 }
3048
3049 /* default top_bs is the active layer */
3050 top_bs = bs;
3051
3052 if (has_top && top) {
3053 if (strcmp(bs->filename, top) != 0) {
3054 top_bs = bdrv_find_backing_image(bs, top);
3055 }
3056 }
3057
3058 if (top_bs == NULL) {
3059 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3060 goto out;
3061 }
3062
3063 assert(bdrv_get_aio_context(top_bs) == aio_context);
3064
3065 if (has_base && base) {
3066 base_bs = bdrv_find_backing_image(top_bs, base);
3067 } else {
3068 base_bs = bdrv_find_base(top_bs);
3069 }
3070
3071 if (base_bs == NULL) {
3072 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3073 goto out;
3074 }
3075
3076 assert(bdrv_get_aio_context(base_bs) == aio_context);
3077
3078 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
3079 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3080 goto out;
3081 }
3082 }
3083
3084 /* Do not allow attempts to commit an image into itself */
3085 if (top_bs == base_bs) {
3086 error_setg(errp, "cannot commit an image into itself");
3087 goto out;
3088 }
3089
3090 if (top_bs == bs) {
3091 if (has_backing_file) {
3092 error_setg(errp, "'backing-file' specified,"
3093 " but 'top' is the active layer");
3094 goto out;
3095 }
3096 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3097 BLOCK_JOB_DEFAULT, speed, on_error, NULL, NULL,
3098 &local_err, false);
3099 } else {
3100 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
3101 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3102 goto out;
3103 }
3104 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed,
3105 on_error, has_backing_file ? backing_file : NULL,
3106 &local_err);
3107 }
3108 if (local_err != NULL) {
3109 error_propagate(errp, local_err);
3110 goto out;
3111 }
3112
3113 out:
3114 aio_context_release(aio_context);
3115 }
3116
3117 static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
3118 Error **errp)
3119 {
3120 BlockDriverState *bs;
3121 BlockDriverState *target_bs;
3122 BlockDriverState *source = NULL;
3123 BlockJob *job = NULL;
3124 BdrvDirtyBitmap *bmap = NULL;
3125 AioContext *aio_context;
3126 QDict *options = NULL;
3127 Error *local_err = NULL;
3128 int flags;
3129 int64_t size;
3130
3131 if (!backup->has_speed) {
3132 backup->speed = 0;
3133 }
3134 if (!backup->has_on_source_error) {
3135 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3136 }
3137 if (!backup->has_on_target_error) {
3138 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3139 }
3140 if (!backup->has_mode) {
3141 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3142 }
3143 if (!backup->has_job_id) {
3144 backup->job_id = NULL;
3145 }
3146 if (!backup->has_compress) {
3147 backup->compress = false;
3148 }
3149
3150 bs = qmp_get_root_bs(backup->device, errp);
3151 if (!bs) {
3152 return NULL;
3153 }
3154
3155 aio_context = bdrv_get_aio_context(bs);
3156 aio_context_acquire(aio_context);
3157
3158 if (!backup->has_format) {
3159 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
3160 NULL : (char*) bs->drv->format_name;
3161 }
3162
3163 /* Early check to avoid creating target */
3164 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3165 goto out;
3166 }
3167
3168 flags = bs->open_flags | BDRV_O_RDWR;
3169
3170 /* See if we have a backing HD we can use to create our new image
3171 * on top of. */
3172 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3173 source = backing_bs(bs);
3174 if (!source) {
3175 backup->sync = MIRROR_SYNC_MODE_FULL;
3176 }
3177 }
3178 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3179 source = bs;
3180 }
3181
3182 size = bdrv_getlength(bs);
3183 if (size < 0) {
3184 error_setg_errno(errp, -size, "bdrv_getlength failed");
3185 goto out;
3186 }
3187
3188 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
3189 assert(backup->format);
3190 if (source) {
3191 bdrv_img_create(backup->target, backup->format, source->filename,
3192 source->drv->format_name, NULL,
3193 size, flags, &local_err, false);
3194 } else {
3195 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
3196 size, flags, &local_err, false);
3197 }
3198 }
3199
3200 if (local_err) {
3201 error_propagate(errp, local_err);
3202 goto out;
3203 }
3204
3205 if (backup->format) {
3206 options = qdict_new();
3207 qdict_put(options, "driver", qstring_from_str(backup->format));
3208 }
3209
3210 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
3211 if (!target_bs) {
3212 goto out;
3213 }
3214
3215 bdrv_set_aio_context(target_bs, aio_context);
3216
3217 if (backup->has_bitmap) {
3218 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3219 if (!bmap) {
3220 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3221 bdrv_unref(target_bs);
3222 goto out;
3223 }
3224 }
3225
3226 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3227 backup->sync, bmap, backup->compress,
3228 backup->on_source_error, backup->on_target_error,
3229 BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err);
3230 bdrv_unref(target_bs);
3231 if (local_err != NULL) {
3232 error_propagate(errp, local_err);
3233 goto out;
3234 }
3235
3236 out:
3237 aio_context_release(aio_context);
3238 return job;
3239 }
3240
3241 void qmp_drive_backup(DriveBackup *arg, Error **errp)
3242 {
3243
3244 BlockJob *job;
3245 job = do_drive_backup(arg, NULL, errp);
3246 if (job) {
3247 block_job_start(job);
3248 }
3249 }
3250
3251 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3252 {
3253 return bdrv_named_nodes_list(errp);
3254 }
3255
3256 BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn,
3257 Error **errp)
3258 {
3259 BlockDriverState *bs;
3260 BlockDriverState *target_bs;
3261 Error *local_err = NULL;
3262 AioContext *aio_context;
3263 BlockJob *job = NULL;
3264
3265 if (!backup->has_speed) {
3266 backup->speed = 0;
3267 }
3268 if (!backup->has_on_source_error) {
3269 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3270 }
3271 if (!backup->has_on_target_error) {
3272 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3273 }
3274 if (!backup->has_job_id) {
3275 backup->job_id = NULL;
3276 }
3277 if (!backup->has_compress) {
3278 backup->compress = false;
3279 }
3280
3281 bs = qmp_get_root_bs(backup->device, errp);
3282 if (!bs) {
3283 return NULL;
3284 }
3285
3286 aio_context = bdrv_get_aio_context(bs);
3287 aio_context_acquire(aio_context);
3288
3289 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
3290 if (!target_bs) {
3291 goto out;
3292 }
3293
3294 if (bdrv_get_aio_context(target_bs) != aio_context) {
3295 if (!bdrv_has_blk(target_bs)) {
3296 /* The target BDS is not attached, we can safely move it to another
3297 * AioContext. */
3298 bdrv_set_aio_context(target_bs, aio_context);
3299 } else {
3300 error_setg(errp, "Target is attached to a different thread from "
3301 "source.");
3302 goto out;
3303 }
3304 }
3305 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3306 backup->sync, NULL, backup->compress,
3307 backup->on_source_error, backup->on_target_error,
3308 BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err);
3309 if (local_err != NULL) {
3310 error_propagate(errp, local_err);
3311 }
3312 out:
3313 aio_context_release(aio_context);
3314 return job;
3315 }
3316
3317 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
3318 {
3319 BlockJob *job;
3320 job = do_blockdev_backup(arg, NULL, errp);
3321 if (job) {
3322 block_job_start(job);
3323 }
3324 }
3325
3326 /* Parameter check and block job starting for drive mirroring.
3327 * Caller should hold @device and @target's aio context (must be the same).
3328 **/
3329 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3330 BlockDriverState *target,
3331 bool has_replaces, const char *replaces,
3332 enum MirrorSyncMode sync,
3333 BlockMirrorBackingMode backing_mode,
3334 bool has_speed, int64_t speed,
3335 bool has_granularity, uint32_t granularity,
3336 bool has_buf_size, int64_t buf_size,
3337 bool has_on_source_error,
3338 BlockdevOnError on_source_error,
3339 bool has_on_target_error,
3340 BlockdevOnError on_target_error,
3341 bool has_unmap, bool unmap,
3342 Error **errp)
3343 {
3344
3345 if (!has_speed) {
3346 speed = 0;
3347 }
3348 if (!has_on_source_error) {
3349 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3350 }
3351 if (!has_on_target_error) {
3352 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3353 }
3354 if (!has_granularity) {
3355 granularity = 0;
3356 }
3357 if (!has_buf_size) {
3358 buf_size = 0;
3359 }
3360 if (!has_unmap) {
3361 unmap = true;
3362 }
3363
3364 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3365 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3366 "a value in range [512B, 64MB]");
3367 return;
3368 }
3369 if (granularity & (granularity - 1)) {
3370 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3371 "power of 2");
3372 return;
3373 }
3374
3375 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3376 return;
3377 }
3378 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3379 return;
3380 }
3381
3382 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3383 sync = MIRROR_SYNC_MODE_FULL;
3384 }
3385
3386 /* pass the node name to replace to mirror start since it's loose coupling
3387 * and will allow to check whether the node still exist at mirror completion
3388 */
3389 mirror_start(job_id, bs, target,
3390 has_replaces ? replaces : NULL,
3391 speed, granularity, buf_size, sync, backing_mode,
3392 on_source_error, on_target_error, unmap, errp);
3393 }
3394
3395 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3396 {
3397 BlockDriverState *bs;
3398 BlockDriverState *source, *target_bs;
3399 AioContext *aio_context;
3400 BlockMirrorBackingMode backing_mode;
3401 Error *local_err = NULL;
3402 QDict *options = NULL;
3403 int flags;
3404 int64_t size;
3405 const char *format = arg->format;
3406
3407 bs = qmp_get_root_bs(arg->device, errp);
3408 if (!bs) {
3409 return;
3410 }
3411
3412 aio_context = bdrv_get_aio_context(bs);
3413 aio_context_acquire(aio_context);
3414
3415 if (!arg->has_mode) {
3416 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3417 }
3418
3419 if (!arg->has_format) {
3420 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3421 ? NULL : bs->drv->format_name);
3422 }
3423
3424 flags = bs->open_flags | BDRV_O_RDWR;
3425 source = backing_bs(bs);
3426 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
3427 arg->sync = MIRROR_SYNC_MODE_FULL;
3428 }
3429 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3430 source = bs;
3431 }
3432
3433 size = bdrv_getlength(bs);
3434 if (size < 0) {
3435 error_setg_errno(errp, -size, "bdrv_getlength failed");
3436 goto out;
3437 }
3438
3439 if (arg->has_replaces) {
3440 BlockDriverState *to_replace_bs;
3441 AioContext *replace_aio_context;
3442 int64_t replace_size;
3443
3444 if (!arg->has_node_name) {
3445 error_setg(errp, "a node-name must be provided when replacing a"
3446 " named node of the graph");
3447 goto out;
3448 }
3449
3450 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
3451
3452 if (!to_replace_bs) {
3453 error_propagate(errp, local_err);
3454 goto out;
3455 }
3456
3457 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3458 aio_context_acquire(replace_aio_context);
3459 replace_size = bdrv_getlength(to_replace_bs);
3460 aio_context_release(replace_aio_context);
3461
3462 if (size != replace_size) {
3463 error_setg(errp, "cannot replace image with a mirror image of "
3464 "different size");
3465 goto out;
3466 }
3467 }
3468
3469 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3470 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3471 } else {
3472 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3473 }
3474
3475 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
3476 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3477 {
3478 /* create new image w/o backing file */
3479 assert(format);
3480 bdrv_img_create(arg->target, format,
3481 NULL, NULL, NULL, size, flags, &local_err, false);
3482 } else {