qxl: check release info object
[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/qdict.h"
39 #include "block/throttle-groups.h"
40 #include "monitor/monitor.h"
41 #include "qemu/error-report.h"
42 #include "qemu/option.h"
43 #include "qemu/qemu-print.h"
44 #include "qemu/config-file.h"
45 #include "qapi/qapi-commands-block.h"
46 #include "qapi/qapi-commands-transaction.h"
47 #include "qapi/qapi-visit-block-core.h"
48 #include "qapi/qmp/qdict.h"
49 #include "qapi/qmp/qnum.h"
50 #include "qapi/qmp/qstring.h"
51 #include "qapi/error.h"
52 #include "qapi/qmp/qerror.h"
53 #include "qapi/qmp/qlist.h"
54 #include "qapi/qobject-output-visitor.h"
55 #include "sysemu/sysemu.h"
56 #include "sysemu/iothread.h"
57 #include "block/block_int.h"
58 #include "block/trace.h"
59 #include "sysemu/arch_init.h"
60 #include "sysemu/qtest.h"
61 #include "qemu/cutils.h"
62 #include "qemu/help_option.h"
63 #include "qemu/throttle-options.h"
64
65 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
66 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
67
68 static int do_open_tray(const char *blk_name, const char *qdev_id,
69 bool force, Error **errp);
70 static void blockdev_remove_medium(bool has_device, const char *device,
71 bool has_id, const char *id, Error **errp);
72 static void blockdev_insert_medium(bool has_device, const char *device,
73 bool has_id, const char *id,
74 const char *node_name, Error **errp);
75
76 static const char *const if_name[IF_COUNT] = {
77 [IF_NONE] = "none",
78 [IF_IDE] = "ide",
79 [IF_SCSI] = "scsi",
80 [IF_FLOPPY] = "floppy",
81 [IF_PFLASH] = "pflash",
82 [IF_MTD] = "mtd",
83 [IF_SD] = "sd",
84 [IF_VIRTIO] = "virtio",
85 [IF_XEN] = "xen",
86 };
87
88 static int if_max_devs[IF_COUNT] = {
89 /*
90 * Do not change these numbers! They govern how drive option
91 * index maps to unit and bus. That mapping is ABI.
92 *
93 * All controllers used to implement if=T drives need to support
94 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
95 * Otherwise, some index values map to "impossible" bus, unit
96 * values.
97 *
98 * For instance, if you change [IF_SCSI] to 255, -drive
99 * if=scsi,index=12 no longer means bus=1,unit=5, but
100 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
101 * the drive can't be set up. Regression.
102 */
103 [IF_IDE] = 2,
104 [IF_SCSI] = 7,
105 };
106
107 /**
108 * Boards may call this to offer board-by-board overrides
109 * of the default, global values.
110 */
111 void override_max_devs(BlockInterfaceType type, int max_devs)
112 {
113 BlockBackend *blk;
114 DriveInfo *dinfo;
115
116 if (max_devs <= 0) {
117 return;
118 }
119
120 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
121 dinfo = blk_legacy_dinfo(blk);
122 if (dinfo->type == type) {
123 fprintf(stderr, "Cannot override units-per-bus property of"
124 " the %s interface, because a drive of that type has"
125 " already been added.\n", if_name[type]);
126 g_assert_not_reached();
127 }
128 }
129
130 if_max_devs[type] = max_devs;
131 }
132
133 /*
134 * We automatically delete the drive when a device using it gets
135 * unplugged. Questionable feature, but we can't just drop it.
136 * Device models call blockdev_mark_auto_del() to schedule the
137 * automatic deletion, and generic qdev code calls blockdev_auto_del()
138 * when deletion is actually safe.
139 */
140 void blockdev_mark_auto_del(BlockBackend *blk)
141 {
142 DriveInfo *dinfo = blk_legacy_dinfo(blk);
143 BlockDriverState *bs = blk_bs(blk);
144 AioContext *aio_context;
145
146 if (!dinfo) {
147 return;
148 }
149
150 if (bs) {
151 aio_context = bdrv_get_aio_context(bs);
152 aio_context_acquire(aio_context);
153
154 if (bs->job) {
155 job_cancel(&bs->job->job, false);
156 }
157
158 aio_context_release(aio_context);
159 }
160
161 dinfo->auto_del = 1;
162 }
163
164 void blockdev_auto_del(BlockBackend *blk)
165 {
166 DriveInfo *dinfo = blk_legacy_dinfo(blk);
167
168 if (dinfo && dinfo->auto_del) {
169 monitor_remove_blk(blk);
170 blk_unref(blk);
171 }
172 }
173
174 /**
175 * Returns the current mapping of how many units per bus
176 * a particular interface can support.
177 *
178 * A positive integer indicates n units per bus.
179 * 0 implies the mapping has not been established.
180 * -1 indicates an invalid BlockInterfaceType was given.
181 */
182 int drive_get_max_devs(BlockInterfaceType type)
183 {
184 if (type >= IF_IDE && type < IF_COUNT) {
185 return if_max_devs[type];
186 }
187
188 return -1;
189 }
190
191 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
192 {
193 int max_devs = if_max_devs[type];
194 return max_devs ? index / max_devs : 0;
195 }
196
197 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
198 {
199 int max_devs = if_max_devs[type];
200 return max_devs ? index % max_devs : index;
201 }
202
203 QemuOpts *drive_def(const char *optstr)
204 {
205 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
206 }
207
208 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
209 const char *optstr)
210 {
211 QemuOpts *opts;
212
213 opts = drive_def(optstr);
214 if (!opts) {
215 return NULL;
216 }
217 if (type != IF_DEFAULT) {
218 qemu_opt_set(opts, "if", if_name[type], &error_abort);
219 }
220 if (index >= 0) {
221 qemu_opt_set_number(opts, "index", index, &error_abort);
222 }
223 if (file)
224 qemu_opt_set(opts, "file", file, &error_abort);
225 return opts;
226 }
227
228 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
229 {
230 BlockBackend *blk;
231 DriveInfo *dinfo;
232
233 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
234 dinfo = blk_legacy_dinfo(blk);
235 if (dinfo && dinfo->type == type
236 && dinfo->bus == bus && dinfo->unit == unit) {
237 return dinfo;
238 }
239 }
240
241 return NULL;
242 }
243
244 void drive_check_orphaned(void)
245 {
246 BlockBackend *blk;
247 DriveInfo *dinfo;
248 Location loc;
249 bool orphans = false;
250
251 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
252 dinfo = blk_legacy_dinfo(blk);
253 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
254 dinfo->type != IF_NONE) {
255 loc_push_none(&loc);
256 qemu_opts_loc_restore(dinfo->opts);
257 error_report("machine type does not support"
258 " if=%s,bus=%d,unit=%d",
259 if_name[dinfo->type], dinfo->bus, dinfo->unit);
260 loc_pop(&loc);
261 orphans = true;
262 }
263 }
264
265 if (orphans) {
266 exit(1);
267 }
268 }
269
270 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
271 {
272 return drive_get(type,
273 drive_index_to_bus_id(type, index),
274 drive_index_to_unit_id(type, index));
275 }
276
277 int drive_get_max_bus(BlockInterfaceType type)
278 {
279 int max_bus;
280 BlockBackend *blk;
281 DriveInfo *dinfo;
282
283 max_bus = -1;
284 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
285 dinfo = blk_legacy_dinfo(blk);
286 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
287 max_bus = dinfo->bus;
288 }
289 }
290 return max_bus;
291 }
292
293 /* Get a block device. This should only be used for single-drive devices
294 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
295 appropriate bus. */
296 DriveInfo *drive_get_next(BlockInterfaceType type)
297 {
298 static int next_block_unit[IF_COUNT];
299
300 return drive_get(type, 0, next_block_unit[type]++);
301 }
302
303 static void bdrv_format_print(void *opaque, const char *name)
304 {
305 qemu_printf(" %s", name);
306 }
307
308 typedef struct {
309 QEMUBH *bh;
310 BlockDriverState *bs;
311 } BDRVPutRefBH;
312
313 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
314 {
315 if (!strcmp(buf, "ignore")) {
316 return BLOCKDEV_ON_ERROR_IGNORE;
317 } else if (!is_read && !strcmp(buf, "enospc")) {
318 return BLOCKDEV_ON_ERROR_ENOSPC;
319 } else if (!strcmp(buf, "stop")) {
320 return BLOCKDEV_ON_ERROR_STOP;
321 } else if (!strcmp(buf, "report")) {
322 return BLOCKDEV_ON_ERROR_REPORT;
323 } else {
324 error_setg(errp, "'%s' invalid %s error action",
325 buf, is_read ? "read" : "write");
326 return -1;
327 }
328 }
329
330 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
331 Error **errp)
332 {
333 const QListEntry *entry;
334 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
335 switch (qobject_type(entry->value)) {
336
337 case QTYPE_QSTRING: {
338 unsigned long long length;
339 const char *str = qstring_get_str(qobject_to(QString,
340 entry->value));
341 if (parse_uint_full(str, &length, 10) == 0 &&
342 length > 0 && length <= UINT_MAX) {
343 block_acct_add_interval(stats, (unsigned) length);
344 } else {
345 error_setg(errp, "Invalid interval length: %s", str);
346 return false;
347 }
348 break;
349 }
350
351 case QTYPE_QNUM: {
352 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
353
354 if (length > 0 && length <= UINT_MAX) {
355 block_acct_add_interval(stats, (unsigned) length);
356 } else {
357 error_setg(errp, "Invalid interval length: %" PRId64, length);
358 return false;
359 }
360 break;
361 }
362
363 default:
364 error_setg(errp, "The specification of stats-intervals is invalid");
365 return false;
366 }
367 }
368 return true;
369 }
370
371 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
372
373 /* All parameters but @opts are optional and may be set to NULL. */
374 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
375 const char **throttling_group, ThrottleConfig *throttle_cfg,
376 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
377 {
378 Error *local_error = NULL;
379 const char *aio;
380
381 if (bdrv_flags) {
382 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
383 *bdrv_flags |= BDRV_O_COPY_ON_READ;
384 }
385
386 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
387 if (!strcmp(aio, "native")) {
388 *bdrv_flags |= BDRV_O_NATIVE_AIO;
389 } else if (!strcmp(aio, "threads")) {
390 /* this is the default */
391 } else {
392 error_setg(errp, "invalid aio option");
393 return;
394 }
395 }
396 }
397
398 /* disk I/O throttling */
399 if (throttling_group) {
400 *throttling_group = qemu_opt_get(opts, "throttling.group");
401 }
402
403 if (throttle_cfg) {
404 throttle_config_init(throttle_cfg);
405 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
406 qemu_opt_get_number(opts, "throttling.bps-total", 0);
407 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
408 qemu_opt_get_number(opts, "throttling.bps-read", 0);
409 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
410 qemu_opt_get_number(opts, "throttling.bps-write", 0);
411 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
412 qemu_opt_get_number(opts, "throttling.iops-total", 0);
413 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
414 qemu_opt_get_number(opts, "throttling.iops-read", 0);
415 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
416 qemu_opt_get_number(opts, "throttling.iops-write", 0);
417
418 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
419 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
420 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
421 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
422 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
423 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
424 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
425 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
426 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
427 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
428 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
429 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
430
431 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
432 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
433 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
434 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
435 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
436 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
437 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
438 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
439 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
440 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
441 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
442 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
443
444 throttle_cfg->op_size =
445 qemu_opt_get_number(opts, "throttling.iops-size", 0);
446
447 if (!throttle_is_valid(throttle_cfg, errp)) {
448 return;
449 }
450 }
451
452 if (detect_zeroes) {
453 *detect_zeroes =
454 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
455 qemu_opt_get(opts, "detect-zeroes"),
456 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
457 &local_error);
458 if (local_error) {
459 error_propagate(errp, local_error);
460 return;
461 }
462 }
463 }
464
465 /* Takes the ownership of bs_opts */
466 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
467 Error **errp)
468 {
469 const char *buf;
470 int bdrv_flags = 0;
471 int on_read_error, on_write_error;
472 bool account_invalid, account_failed;
473 bool writethrough, read_only;
474 BlockBackend *blk;
475 BlockDriverState *bs;
476 ThrottleConfig cfg;
477 int snapshot = 0;
478 Error *error = NULL;
479 QemuOpts *opts;
480 QDict *interval_dict = NULL;
481 QList *interval_list = NULL;
482 const char *id;
483 BlockdevDetectZeroesOptions detect_zeroes =
484 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
485 const char *throttling_group = NULL;
486
487 /* Check common options by copying from bs_opts to opts, all other options
488 * stay in bs_opts for processing by bdrv_open(). */
489 id = qdict_get_try_str(bs_opts, "id");
490 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
491 if (error) {
492 error_propagate(errp, error);
493 goto err_no_opts;
494 }
495
496 qemu_opts_absorb_qdict(opts, bs_opts, &error);
497 if (error) {
498 error_propagate(errp, error);
499 goto early_err;
500 }
501
502 if (id) {
503 qdict_del(bs_opts, "id");
504 }
505
506 /* extract parameters */
507 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
508
509 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
510 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
511
512 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
513
514 id = qemu_opts_id(opts);
515
516 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
517 qdict_array_split(interval_dict, &interval_list);
518
519 if (qdict_size(interval_dict) != 0) {
520 error_setg(errp, "Invalid option stats-intervals.%s",
521 qdict_first(interval_dict)->key);
522 goto early_err;
523 }
524
525 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
526 &detect_zeroes, &error);
527 if (error) {
528 error_propagate(errp, error);
529 goto early_err;
530 }
531
532 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
533 if (is_help_option(buf)) {
534 qemu_printf("Supported formats:");
535 bdrv_iterate_format(bdrv_format_print, NULL, false);
536 qemu_printf("\nSupported formats (read-only):");
537 bdrv_iterate_format(bdrv_format_print, NULL, true);
538 qemu_printf("\n");
539 goto early_err;
540 }
541
542 if (qdict_haskey(bs_opts, "driver")) {
543 error_setg(errp, "Cannot specify both 'driver' and 'format'");
544 goto early_err;
545 }
546 qdict_put_str(bs_opts, "driver", buf);
547 }
548
549 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
550 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
551 on_write_error = parse_block_error_action(buf, 0, &error);
552 if (error) {
553 error_propagate(errp, error);
554 goto early_err;
555 }
556 }
557
558 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
559 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
560 on_read_error = parse_block_error_action(buf, 1, &error);
561 if (error) {
562 error_propagate(errp, error);
563 goto early_err;
564 }
565 }
566
567 if (snapshot) {
568 bdrv_flags |= BDRV_O_SNAPSHOT;
569 }
570
571 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
572
573 /* init */
574 if ((!file || !*file) && !qdict_size(bs_opts)) {
575 BlockBackendRootState *blk_rs;
576
577 blk = blk_new(0, BLK_PERM_ALL);
578 blk_rs = blk_get_root_state(blk);
579 blk_rs->open_flags = bdrv_flags;
580 blk_rs->read_only = read_only;
581 blk_rs->detect_zeroes = detect_zeroes;
582
583 qobject_unref(bs_opts);
584 } else {
585 if (file && !*file) {
586 file = NULL;
587 }
588
589 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
590 * with other callers) rather than what we want as the real defaults.
591 * Apply the defaults here instead. */
592 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
593 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
594 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
595 read_only ? "on" : "off");
596 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on");
597 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
598
599 if (runstate_check(RUN_STATE_INMIGRATE)) {
600 bdrv_flags |= BDRV_O_INACTIVE;
601 }
602
603 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
604 if (!blk) {
605 goto err_no_bs_opts;
606 }
607 bs = blk_bs(blk);
608
609 bs->detect_zeroes = detect_zeroes;
610
611 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
612
613 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
614 blk_unref(blk);
615 blk = NULL;
616 goto err_no_bs_opts;
617 }
618 }
619
620 /* disk I/O throttling */
621 if (throttle_enabled(&cfg)) {
622 if (!throttling_group) {
623 throttling_group = id;
624 }
625 blk_io_limits_enable(blk, throttling_group);
626 blk_set_io_limits(blk, &cfg);
627 }
628
629 blk_set_enable_write_cache(blk, !writethrough);
630 blk_set_on_error(blk, on_read_error, on_write_error);
631
632 if (!monitor_add_blk(blk, id, errp)) {
633 blk_unref(blk);
634 blk = NULL;
635 goto err_no_bs_opts;
636 }
637
638 err_no_bs_opts:
639 qemu_opts_del(opts);
640 qobject_unref(interval_dict);
641 qobject_unref(interval_list);
642 return blk;
643
644 early_err:
645 qemu_opts_del(opts);
646 qobject_unref(interval_dict);
647 qobject_unref(interval_list);
648 err_no_opts:
649 qobject_unref(bs_opts);
650 return NULL;
651 }
652
653 /* Takes the ownership of bs_opts */
654 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
655 {
656 int bdrv_flags = 0;
657
658 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
659 * with other callers) rather than what we want as the real defaults.
660 * Apply the defaults here instead. */
661 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
662 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
663 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
664
665 if (runstate_check(RUN_STATE_INMIGRATE)) {
666 bdrv_flags |= BDRV_O_INACTIVE;
667 }
668
669 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
670 }
671
672 void blockdev_close_all_bdrv_states(void)
673 {
674 BlockDriverState *bs, *next_bs;
675
676 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
677 AioContext *ctx = bdrv_get_aio_context(bs);
678
679 aio_context_acquire(ctx);
680 bdrv_unref(bs);
681 aio_context_release(ctx);
682 }
683 }
684
685 /* Iterates over the list of monitor-owned BlockDriverStates */
686 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
687 {
688 return bs ? QTAILQ_NEXT(bs, monitor_list)
689 : QTAILQ_FIRST(&monitor_bdrv_states);
690 }
691
692 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
693 Error **errp)
694 {
695 const char *value;
696
697 value = qemu_opt_get(opts, from);
698 if (value) {
699 if (qemu_opt_find(opts, to)) {
700 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
701 "same time", to, from);
702 return;
703 }
704 }
705
706 /* rename all items in opts */
707 while ((value = qemu_opt_get(opts, from))) {
708 qemu_opt_set(opts, to, value, &error_abort);
709 qemu_opt_unset(opts, from);
710 }
711 }
712
713 QemuOptsList qemu_legacy_drive_opts = {
714 .name = "drive",
715 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
716 .desc = {
717 {
718 .name = "bus",
719 .type = QEMU_OPT_NUMBER,
720 .help = "bus number",
721 },{
722 .name = "unit",
723 .type = QEMU_OPT_NUMBER,
724 .help = "unit number (i.e. lun for scsi)",
725 },{
726 .name = "index",
727 .type = QEMU_OPT_NUMBER,
728 .help = "index number",
729 },{
730 .name = "media",
731 .type = QEMU_OPT_STRING,
732 .help = "media type (disk, cdrom)",
733 },{
734 .name = "if",
735 .type = QEMU_OPT_STRING,
736 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
737 },{
738 .name = "file",
739 .type = QEMU_OPT_STRING,
740 .help = "file name",
741 },
742
743 /* Options that are passed on, but have special semantics with -drive */
744 {
745 .name = BDRV_OPT_READ_ONLY,
746 .type = QEMU_OPT_BOOL,
747 .help = "open drive file as read-only",
748 },{
749 .name = "rerror",
750 .type = QEMU_OPT_STRING,
751 .help = "read error action",
752 },{
753 .name = "werror",
754 .type = QEMU_OPT_STRING,
755 .help = "write error action",
756 },{
757 .name = "copy-on-read",
758 .type = QEMU_OPT_BOOL,
759 .help = "copy read data from backing file into image file",
760 },
761
762 { /* end of list */ }
763 },
764 };
765
766 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
767 Error **errp)
768 {
769 const char *value;
770 BlockBackend *blk;
771 DriveInfo *dinfo = NULL;
772 QDict *bs_opts;
773 QemuOpts *legacy_opts;
774 DriveMediaType media = MEDIA_DISK;
775 BlockInterfaceType type;
776 int max_devs, bus_id, unit_id, index;
777 const char *werror, *rerror;
778 bool read_only = false;
779 bool copy_on_read;
780 const char *filename;
781 Error *local_err = NULL;
782 int i;
783
784 /* Change legacy command line options into QMP ones */
785 static const struct {
786 const char *from;
787 const char *to;
788 } opt_renames[] = {
789 { "iops", "throttling.iops-total" },
790 { "iops_rd", "throttling.iops-read" },
791 { "iops_wr", "throttling.iops-write" },
792
793 { "bps", "throttling.bps-total" },
794 { "bps_rd", "throttling.bps-read" },
795 { "bps_wr", "throttling.bps-write" },
796
797 { "iops_max", "throttling.iops-total-max" },
798 { "iops_rd_max", "throttling.iops-read-max" },
799 { "iops_wr_max", "throttling.iops-write-max" },
800
801 { "bps_max", "throttling.bps-total-max" },
802 { "bps_rd_max", "throttling.bps-read-max" },
803 { "bps_wr_max", "throttling.bps-write-max" },
804
805 { "iops_size", "throttling.iops-size" },
806
807 { "group", "throttling.group" },
808
809 { "readonly", BDRV_OPT_READ_ONLY },
810 };
811
812 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
813 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
814 &local_err);
815 if (local_err) {
816 error_propagate(errp, local_err);
817 return NULL;
818 }
819 }
820
821 value = qemu_opt_get(all_opts, "cache");
822 if (value) {
823 int flags = 0;
824 bool writethrough;
825
826 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
827 error_setg(errp, "invalid cache option");
828 return NULL;
829 }
830
831 /* Specific options take precedence */
832 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
833 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
834 !writethrough, &error_abort);
835 }
836 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
837 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
838 !!(flags & BDRV_O_NOCACHE), &error_abort);
839 }
840 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
841 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
842 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
843 }
844 qemu_opt_unset(all_opts, "cache");
845 }
846
847 /* Get a QDict for processing the options */
848 bs_opts = qdict_new();
849 qemu_opts_to_qdict(all_opts, bs_opts);
850
851 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
852 &error_abort);
853 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
854 if (local_err) {
855 error_propagate(errp, local_err);
856 goto fail;
857 }
858
859 /* Media type */
860 value = qemu_opt_get(legacy_opts, "media");
861 if (value) {
862 if (!strcmp(value, "disk")) {
863 media = MEDIA_DISK;
864 } else if (!strcmp(value, "cdrom")) {
865 media = MEDIA_CDROM;
866 read_only = true;
867 } else {
868 error_setg(errp, "'%s' invalid media", value);
869 goto fail;
870 }
871 }
872
873 /* copy-on-read is disabled with a warning for read-only devices */
874 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
875 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
876
877 if (read_only && copy_on_read) {
878 warn_report("disabling copy-on-read on read-only drive");
879 copy_on_read = false;
880 }
881
882 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
883 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
884
885 /* Controller type */
886 value = qemu_opt_get(legacy_opts, "if");
887 if (value) {
888 for (type = 0;
889 type < IF_COUNT && strcmp(value, if_name[type]);
890 type++) {
891 }
892 if (type == IF_COUNT) {
893 error_setg(errp, "unsupported bus type '%s'", value);
894 goto fail;
895 }
896 } else {
897 type = block_default_type;
898 }
899
900 /* Device address specified by bus/unit or index.
901 * If none was specified, try to find the first free one. */
902 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
903 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
904 index = qemu_opt_get_number(legacy_opts, "index", -1);
905
906 max_devs = if_max_devs[type];
907
908 if (index != -1) {
909 if (bus_id != 0 || unit_id != -1) {
910 error_setg(errp, "index cannot be used with bus and unit");
911 goto fail;
912 }
913 bus_id = drive_index_to_bus_id(type, index);
914 unit_id = drive_index_to_unit_id(type, index);
915 }
916
917 if (unit_id == -1) {
918 unit_id = 0;
919 while (drive_get(type, bus_id, unit_id) != NULL) {
920 unit_id++;
921 if (max_devs && unit_id >= max_devs) {
922 unit_id -= max_devs;
923 bus_id++;
924 }
925 }
926 }
927
928 if (max_devs && unit_id >= max_devs) {
929 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
930 goto fail;
931 }
932
933 if (drive_get(type, bus_id, unit_id) != NULL) {
934 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
935 bus_id, unit_id, index);
936 goto fail;
937 }
938
939 /* no id supplied -> create one */
940 if (qemu_opts_id(all_opts) == NULL) {
941 char *new_id;
942 const char *mediastr = "";
943 if (type == IF_IDE || type == IF_SCSI) {
944 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
945 }
946 if (max_devs) {
947 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
948 mediastr, unit_id);
949 } else {
950 new_id = g_strdup_printf("%s%s%i", if_name[type],
951 mediastr, unit_id);
952 }
953 qdict_put_str(bs_opts, "id", new_id);
954 g_free(new_id);
955 }
956
957 /* Add virtio block device */
958 if (type == IF_VIRTIO) {
959 QemuOpts *devopts;
960 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
961 &error_abort);
962 if (arch_type == QEMU_ARCH_S390X) {
963 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
964 } else {
965 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
966 }
967 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
968 &error_abort);
969 }
970
971 filename = qemu_opt_get(legacy_opts, "file");
972
973 /* Check werror/rerror compatibility with if=... */
974 werror = qemu_opt_get(legacy_opts, "werror");
975 if (werror != NULL) {
976 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
977 type != IF_NONE) {
978 error_setg(errp, "werror is not supported by this bus type");
979 goto fail;
980 }
981 qdict_put_str(bs_opts, "werror", werror);
982 }
983
984 rerror = qemu_opt_get(legacy_opts, "rerror");
985 if (rerror != NULL) {
986 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
987 type != IF_NONE) {
988 error_setg(errp, "rerror is not supported by this bus type");
989 goto fail;
990 }
991 qdict_put_str(bs_opts, "rerror", rerror);
992 }
993
994 /* Actual block device init: Functionality shared with blockdev-add */
995 blk = blockdev_init(filename, bs_opts, &local_err);
996 bs_opts = NULL;
997 if (!blk) {
998 error_propagate(errp, local_err);
999 goto fail;
1000 } else {
1001 assert(!local_err);
1002 }
1003
1004 /* Create legacy DriveInfo */
1005 dinfo = g_malloc0(sizeof(*dinfo));
1006 dinfo->opts = all_opts;
1007
1008 dinfo->type = type;
1009 dinfo->bus = bus_id;
1010 dinfo->unit = unit_id;
1011
1012 blk_set_legacy_dinfo(blk, dinfo);
1013
1014 switch(type) {
1015 case IF_IDE:
1016 case IF_SCSI:
1017 case IF_XEN:
1018 case IF_NONE:
1019 dinfo->media_cd = media == MEDIA_CDROM;
1020 break;
1021 default:
1022 break;
1023 }
1024
1025 fail:
1026 qemu_opts_del(legacy_opts);
1027 qobject_unref(bs_opts);
1028 return dinfo;
1029 }
1030
1031 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1032 {
1033 BlockDriverState *bs;
1034
1035 bs = bdrv_lookup_bs(name, name, errp);
1036 if (bs == NULL) {
1037 return NULL;
1038 }
1039
1040 if (!bdrv_is_root_node(bs)) {
1041 error_setg(errp, "Need a root block node");
1042 return NULL;
1043 }
1044
1045 if (!bdrv_is_inserted(bs)) {
1046 error_setg(errp, "Device has no medium");
1047 return NULL;
1048 }
1049
1050 return bs;
1051 }
1052
1053 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id,
1054 Error **errp)
1055 {
1056 BlockBackend *blk;
1057
1058 if (!blk_name == !qdev_id) {
1059 error_setg(errp, "Need exactly one of 'device' and 'id'");
1060 return NULL;
1061 }
1062
1063 if (qdev_id) {
1064 blk = blk_by_qdev_id(qdev_id, errp);
1065 } else {
1066 blk = blk_by_name(blk_name);
1067 if (blk == NULL) {
1068 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1069 "Device '%s' not found", blk_name);
1070 }
1071 }
1072
1073 return blk;
1074 }
1075
1076 void hmp_commit(Monitor *mon, const QDict *qdict)
1077 {
1078 const char *device = qdict_get_str(qdict, "device");
1079 BlockBackend *blk;
1080 int ret;
1081
1082 if (!strcmp(device, "all")) {
1083 ret = blk_commit_all();
1084 } else {
1085 BlockDriverState *bs;
1086 AioContext *aio_context;
1087
1088 blk = blk_by_name(device);
1089 if (!blk) {
1090 monitor_printf(mon, "Device '%s' not found\n", device);
1091 return;
1092 }
1093 if (!blk_is_available(blk)) {
1094 monitor_printf(mon, "Device '%s' has no medium\n", device);
1095 return;
1096 }
1097
1098 bs = blk_bs(blk);
1099 aio_context = bdrv_get_aio_context(bs);
1100 aio_context_acquire(aio_context);
1101
1102 ret = bdrv_commit(bs);
1103
1104 aio_context_release(aio_context);
1105 }
1106 if (ret < 0) {
1107 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1108 strerror(-ret));
1109 }
1110 }
1111
1112 static void blockdev_do_action(TransactionAction *action, Error **errp)
1113 {
1114 TransactionActionList list;
1115
1116 list.value = action;
1117 list.next = NULL;
1118 qmp_transaction(&list, false, NULL, errp);
1119 }
1120
1121 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1122 bool has_node_name, const char *node_name,
1123 const char *snapshot_file,
1124 bool has_snapshot_node_name,
1125 const char *snapshot_node_name,
1126 bool has_format, const char *format,
1127 bool has_mode, NewImageMode mode, Error **errp)
1128 {
1129 BlockdevSnapshotSync snapshot = {
1130 .has_device = has_device,
1131 .device = (char *) device,
1132 .has_node_name = has_node_name,
1133 .node_name = (char *) node_name,
1134 .snapshot_file = (char *) snapshot_file,
1135 .has_snapshot_node_name = has_snapshot_node_name,
1136 .snapshot_node_name = (char *) snapshot_node_name,
1137 .has_format = has_format,
1138 .format = (char *) format,
1139 .has_mode = has_mode,
1140 .mode = mode,
1141 };
1142 TransactionAction action = {
1143 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1144 .u.blockdev_snapshot_sync.data = &snapshot,
1145 };
1146 blockdev_do_action(&action, errp);
1147 }
1148
1149 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1150 Error **errp)
1151 {
1152 BlockdevSnapshot snapshot_data = {
1153 .node = (char *) node,
1154 .overlay = (char *) overlay
1155 };
1156 TransactionAction action = {
1157 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1158 .u.blockdev_snapshot.data = &snapshot_data,
1159 };
1160 blockdev_do_action(&action, errp);
1161 }
1162
1163 void qmp_blockdev_snapshot_internal_sync(const char *device,
1164 const char *name,
1165 Error **errp)
1166 {
1167 BlockdevSnapshotInternal snapshot = {
1168 .device = (char *) device,
1169 .name = (char *) name
1170 };
1171 TransactionAction action = {
1172 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1173 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1174 };
1175 blockdev_do_action(&action, errp);
1176 }
1177
1178 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1179 bool has_id,
1180 const char *id,
1181 bool has_name,
1182 const char *name,
1183 Error **errp)
1184 {
1185 BlockDriverState *bs;
1186 AioContext *aio_context;
1187 QEMUSnapshotInfo sn;
1188 Error *local_err = NULL;
1189 SnapshotInfo *info = NULL;
1190 int ret;
1191
1192 bs = qmp_get_root_bs(device, errp);
1193 if (!bs) {
1194 return NULL;
1195 }
1196 aio_context = bdrv_get_aio_context(bs);
1197 aio_context_acquire(aio_context);
1198
1199 if (!has_id) {
1200 id = NULL;
1201 }
1202
1203 if (!has_name) {
1204 name = NULL;
1205 }
1206
1207 if (!id && !name) {
1208 error_setg(errp, "Name or id must be provided");
1209 goto out_aio_context;
1210 }
1211
1212 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1213 goto out_aio_context;
1214 }
1215
1216 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1217 if (local_err) {
1218 error_propagate(errp, local_err);
1219 goto out_aio_context;
1220 }
1221 if (!ret) {
1222 error_setg(errp,
1223 "Snapshot with id '%s' and name '%s' does not exist on "
1224 "device '%s'",
1225 STR_OR_NULL(id), STR_OR_NULL(name), device);
1226 goto out_aio_context;
1227 }
1228
1229 bdrv_snapshot_delete(bs, id, name, &local_err);
1230 if (local_err) {
1231 error_propagate(errp, local_err);
1232 goto out_aio_context;
1233 }
1234
1235 aio_context_release(aio_context);
1236
1237 info = g_new0(SnapshotInfo, 1);
1238 info->id = g_strdup(sn.id_str);
1239 info->name = g_strdup(sn.name);
1240 info->date_nsec = sn.date_nsec;
1241 info->date_sec = sn.date_sec;
1242 info->vm_state_size = sn.vm_state_size;
1243 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1244 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1245
1246 return info;
1247
1248 out_aio_context:
1249 aio_context_release(aio_context);
1250 return NULL;
1251 }
1252
1253 /**
1254 * block_dirty_bitmap_lookup:
1255 * Return a dirty bitmap (if present), after validating
1256 * the node reference and bitmap names.
1257 *
1258 * @node: The name of the BDS node to search for bitmaps
1259 * @name: The name of the bitmap to search for
1260 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1261 * @errp: Output pointer for error information. Can be NULL.
1262 *
1263 * @return: A bitmap object on success, or NULL on failure.
1264 */
1265 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1266 const char *name,
1267 BlockDriverState **pbs,
1268 Error **errp)
1269 {
1270 BlockDriverState *bs;
1271 BdrvDirtyBitmap *bitmap;
1272
1273 if (!node) {
1274 error_setg(errp, "Node cannot be NULL");
1275 return NULL;
1276 }
1277 if (!name) {
1278 error_setg(errp, "Bitmap name cannot be NULL");
1279 return NULL;
1280 }
1281 bs = bdrv_lookup_bs(node, node, NULL);
1282 if (!bs) {
1283 error_setg(errp, "Node '%s' not found", node);
1284 return NULL;
1285 }
1286
1287 bitmap = bdrv_find_dirty_bitmap(bs, name);
1288 if (!bitmap) {
1289 error_setg(errp, "Dirty bitmap '%s' not found", name);
1290 return NULL;
1291 }
1292
1293 if (pbs) {
1294 *pbs = bs;
1295 }
1296
1297 return bitmap;
1298 }
1299
1300 /* New and old BlockDriverState structs for atomic group operations */
1301
1302 typedef struct BlkActionState BlkActionState;
1303
1304 /**
1305 * BlkActionOps:
1306 * Table of operations that define an Action.
1307 *
1308 * @instance_size: Size of state struct, in bytes.
1309 * @prepare: Prepare the work, must NOT be NULL.
1310 * @commit: Commit the changes, can be NULL.
1311 * @abort: Abort the changes on fail, can be NULL.
1312 * @clean: Clean up resources after all transaction actions have called
1313 * commit() or abort(). Can be NULL.
1314 *
1315 * Only prepare() may fail. In a single transaction, only one of commit() or
1316 * abort() will be called. clean() will always be called if it is present.
1317 */
1318 typedef struct BlkActionOps {
1319 size_t instance_size;
1320 void (*prepare)(BlkActionState *common, Error **errp);
1321 void (*commit)(BlkActionState *common);
1322 void (*abort)(BlkActionState *common);
1323 void (*clean)(BlkActionState *common);
1324 } BlkActionOps;
1325
1326 /**
1327 * BlkActionState:
1328 * Describes one Action's state within a Transaction.
1329 *
1330 * @action: QAPI-defined enum identifying which Action to perform.
1331 * @ops: Table of ActionOps this Action can perform.
1332 * @block_job_txn: Transaction which this action belongs to.
1333 * @entry: List membership for all Actions in this Transaction.
1334 *
1335 * This structure must be arranged as first member in a subclassed type,
1336 * assuming that the compiler will also arrange it to the same offsets as the
1337 * base class.
1338 */
1339 struct BlkActionState {
1340 TransactionAction *action;
1341 const BlkActionOps *ops;
1342 JobTxn *block_job_txn;
1343 TransactionProperties *txn_props;
1344 QTAILQ_ENTRY(BlkActionState) entry;
1345 };
1346
1347 /* internal snapshot private data */
1348 typedef struct InternalSnapshotState {
1349 BlkActionState common;
1350 BlockDriverState *bs;
1351 QEMUSnapshotInfo sn;
1352 bool created;
1353 } InternalSnapshotState;
1354
1355
1356 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1357 {
1358 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1359 error_setg(errp,
1360 "Action '%s' does not support Transaction property "
1361 "completion-mode = %s",
1362 TransactionActionKind_str(s->action->type),
1363 ActionCompletionMode_str(s->txn_props->completion_mode));
1364 return -1;
1365 }
1366 return 0;
1367 }
1368
1369 static void internal_snapshot_prepare(BlkActionState *common,
1370 Error **errp)
1371 {
1372 Error *local_err = NULL;
1373 const char *device;
1374 const char *name;
1375 BlockDriverState *bs;
1376 QEMUSnapshotInfo old_sn, *sn;
1377 bool ret;
1378 qemu_timeval tv;
1379 BlockdevSnapshotInternal *internal;
1380 InternalSnapshotState *state;
1381 AioContext *aio_context;
1382 int ret1;
1383
1384 g_assert(common->action->type ==
1385 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1386 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1387 state = DO_UPCAST(InternalSnapshotState, common, common);
1388
1389 /* 1. parse input */
1390 device = internal->device;
1391 name = internal->name;
1392
1393 /* 2. check for validation */
1394 if (action_check_completion_mode(common, errp) < 0) {
1395 return;
1396 }
1397
1398 bs = qmp_get_root_bs(device, errp);
1399 if (!bs) {
1400 return;
1401 }
1402
1403 aio_context = bdrv_get_aio_context(bs);
1404 aio_context_acquire(aio_context);
1405
1406 state->bs = bs;
1407
1408 /* Paired with .clean() */
1409 bdrv_drained_begin(bs);
1410
1411 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1412 goto out;
1413 }
1414
1415 if (bdrv_is_read_only(bs)) {
1416 error_setg(errp, "Device '%s' is read only", device);
1417 goto out;
1418 }
1419
1420 if (!bdrv_can_snapshot(bs)) {
1421 error_setg(errp, "Block format '%s' used by device '%s' "
1422 "does not support internal snapshots",
1423 bs->drv->format_name, device);
1424 goto out;
1425 }
1426
1427 if (!strlen(name)) {
1428 error_setg(errp, "Name is empty");
1429 goto out;
1430 }
1431
1432 /* check whether a snapshot with name exist */
1433 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1434 &local_err);
1435 if (local_err) {
1436 error_propagate(errp, local_err);
1437 goto out;
1438 } else if (ret) {
1439 error_setg(errp,
1440 "Snapshot with name '%s' already exists on device '%s'",
1441 name, device);
1442 goto out;
1443 }
1444
1445 /* 3. take the snapshot */
1446 sn = &state->sn;
1447 pstrcpy(sn->name, sizeof(sn->name), name);
1448 qemu_gettimeofday(&tv);
1449 sn->date_sec = tv.tv_sec;
1450 sn->date_nsec = tv.tv_usec * 1000;
1451 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1452
1453 ret1 = bdrv_snapshot_create(bs, sn);
1454 if (ret1 < 0) {
1455 error_setg_errno(errp, -ret1,
1456 "Failed to create snapshot '%s' on device '%s'",
1457 name, device);
1458 goto out;
1459 }
1460
1461 /* 4. succeed, mark a snapshot is created */
1462 state->created = true;
1463
1464 out:
1465 aio_context_release(aio_context);
1466 }
1467
1468 static void internal_snapshot_abort(BlkActionState *common)
1469 {
1470 InternalSnapshotState *state =
1471 DO_UPCAST(InternalSnapshotState, common, common);
1472 BlockDriverState *bs = state->bs;
1473 QEMUSnapshotInfo *sn = &state->sn;
1474 AioContext *aio_context;
1475 Error *local_error = NULL;
1476
1477 if (!state->created) {
1478 return;
1479 }
1480
1481 aio_context = bdrv_get_aio_context(state->bs);
1482 aio_context_acquire(aio_context);
1483
1484 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1485 error_reportf_err(local_error,
1486 "Failed to delete snapshot with id '%s' and "
1487 "name '%s' on device '%s' in abort: ",
1488 sn->id_str, sn->name,
1489 bdrv_get_device_name(bs));
1490 }
1491
1492 aio_context_release(aio_context);
1493 }
1494
1495 static void internal_snapshot_clean(BlkActionState *common)
1496 {
1497 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1498 common, common);
1499 AioContext *aio_context;
1500
1501 if (!state->bs) {
1502 return;
1503 }
1504
1505 aio_context = bdrv_get_aio_context(state->bs);
1506 aio_context_acquire(aio_context);
1507
1508 bdrv_drained_end(state->bs);
1509
1510 aio_context_release(aio_context);
1511 }
1512
1513 /* external snapshot private data */
1514 typedef struct ExternalSnapshotState {
1515 BlkActionState common;
1516 BlockDriverState *old_bs;
1517 BlockDriverState *new_bs;
1518 bool overlay_appended;
1519 } ExternalSnapshotState;
1520
1521 static void external_snapshot_prepare(BlkActionState *common,
1522 Error **errp)
1523 {
1524 int flags = 0;
1525 QDict *options = NULL;
1526 Error *local_err = NULL;
1527 /* Device and node name of the image to generate the snapshot from */
1528 const char *device;
1529 const char *node_name;
1530 /* Reference to the new image (for 'blockdev-snapshot') */
1531 const char *snapshot_ref;
1532 /* File name of the new image (for 'blockdev-snapshot-sync') */
1533 const char *new_image_file;
1534 ExternalSnapshotState *state =
1535 DO_UPCAST(ExternalSnapshotState, common, common);
1536 TransactionAction *action = common->action;
1537 AioContext *aio_context;
1538
1539 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1540 * purpose but a different set of parameters */
1541 switch (action->type) {
1542 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1543 {
1544 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1545 device = s->node;
1546 node_name = s->node;
1547 new_image_file = NULL;
1548 snapshot_ref = s->overlay;
1549 }
1550 break;
1551 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1552 {
1553 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1554 device = s->has_device ? s->device : NULL;
1555 node_name = s->has_node_name ? s->node_name : NULL;
1556 new_image_file = s->snapshot_file;
1557 snapshot_ref = NULL;
1558 }
1559 break;
1560 default:
1561 g_assert_not_reached();
1562 }
1563
1564 /* start processing */
1565 if (action_check_completion_mode(common, errp) < 0) {
1566 return;
1567 }
1568
1569 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1570 if (!state->old_bs) {
1571 return;
1572 }
1573
1574 aio_context = bdrv_get_aio_context(state->old_bs);
1575 aio_context_acquire(aio_context);
1576
1577 /* Paired with .clean() */
1578 bdrv_drained_begin(state->old_bs);
1579
1580 if (!bdrv_is_inserted(state->old_bs)) {
1581 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1582 goto out;
1583 }
1584
1585 if (bdrv_op_is_blocked(state->old_bs,
1586 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1587 goto out;
1588 }
1589
1590 if (!bdrv_is_read_only(state->old_bs)) {
1591 if (bdrv_flush(state->old_bs)) {
1592 error_setg(errp, QERR_IO_ERROR);
1593 goto out;
1594 }
1595 }
1596
1597 if (!bdrv_is_first_non_filter(state->old_bs)) {
1598 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1599 goto out;
1600 }
1601
1602 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1603 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1604 const char *format = s->has_format ? s->format : "qcow2";
1605 enum NewImageMode mode;
1606 const char *snapshot_node_name =
1607 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1608
1609 if (node_name && !snapshot_node_name) {
1610 error_setg(errp, "New snapshot node name missing");
1611 goto out;
1612 }
1613
1614 if (snapshot_node_name &&
1615 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1616 error_setg(errp, "New snapshot node name already in use");
1617 goto out;
1618 }
1619
1620 flags = state->old_bs->open_flags;
1621 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1622 flags |= BDRV_O_NO_BACKING;
1623
1624 /* create new image w/backing file */
1625 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1626 if (mode != NEW_IMAGE_MODE_EXISTING) {
1627 int64_t size = bdrv_getlength(state->old_bs);
1628 if (size < 0) {
1629 error_setg_errno(errp, -size, "bdrv_getlength failed");
1630 goto out;
1631 }
1632 bdrv_refresh_filename(state->old_bs);
1633 bdrv_img_create(new_image_file, format,
1634 state->old_bs->filename,
1635 state->old_bs->drv->format_name,
1636 NULL, size, flags, false, &local_err);
1637 if (local_err) {
1638 error_propagate(errp, local_err);
1639 goto out;
1640 }
1641 }
1642
1643 options = qdict_new();
1644 if (snapshot_node_name) {
1645 qdict_put_str(options, "node-name", snapshot_node_name);
1646 }
1647 qdict_put_str(options, "driver", format);
1648 }
1649
1650 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1651 errp);
1652 /* We will manually add the backing_hd field to the bs later */
1653 if (!state->new_bs) {
1654 goto out;
1655 }
1656
1657 if (bdrv_has_blk(state->new_bs)) {
1658 error_setg(errp, "The snapshot is already in use");
1659 goto out;
1660 }
1661
1662 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1663 errp)) {
1664 goto out;
1665 }
1666
1667 if (state->new_bs->backing != NULL) {
1668 error_setg(errp, "The snapshot already has a backing image");
1669 goto out;
1670 }
1671
1672 if (!state->new_bs->drv->supports_backing) {
1673 error_setg(errp, "The snapshot does not support backing images");
1674 goto out;
1675 }
1676
1677 bdrv_set_aio_context(state->new_bs, aio_context);
1678
1679 /* This removes our old bs and adds the new bs. This is an operation that
1680 * can fail, so we need to do it in .prepare; undoing it for abort is
1681 * always possible. */
1682 bdrv_ref(state->new_bs);
1683 bdrv_append(state->new_bs, state->old_bs, &local_err);
1684 if (local_err) {
1685 error_propagate(errp, local_err);
1686 goto out;
1687 }
1688 state->overlay_appended = true;
1689
1690 out:
1691 aio_context_release(aio_context);
1692 }
1693
1694 static void external_snapshot_commit(BlkActionState *common)
1695 {
1696 ExternalSnapshotState *state =
1697 DO_UPCAST(ExternalSnapshotState, common, common);
1698 AioContext *aio_context;
1699
1700 aio_context = bdrv_get_aio_context(state->old_bs);
1701 aio_context_acquire(aio_context);
1702
1703 /* We don't need (or want) to use the transactional
1704 * bdrv_reopen_multiple() across all the entries at once, because we
1705 * don't want to abort all of them if one of them fails the reopen */
1706 if (!atomic_read(&state->old_bs->copy_on_read)) {
1707 bdrv_reopen_set_read_only(state->old_bs, true, NULL);
1708 }
1709
1710 aio_context_release(aio_context);
1711 }
1712
1713 static void external_snapshot_abort(BlkActionState *common)
1714 {
1715 ExternalSnapshotState *state =
1716 DO_UPCAST(ExternalSnapshotState, common, common);
1717 if (state->new_bs) {
1718 if (state->overlay_appended) {
1719 AioContext *aio_context;
1720
1721 aio_context = bdrv_get_aio_context(state->old_bs);
1722 aio_context_acquire(aio_context);
1723
1724 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1725 close state->old_bs; we need it */
1726 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1727 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1728 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1729
1730 aio_context_release(aio_context);
1731 }
1732 }
1733 }
1734
1735 static void external_snapshot_clean(BlkActionState *common)
1736 {
1737 ExternalSnapshotState *state =
1738 DO_UPCAST(ExternalSnapshotState, common, common);
1739 AioContext *aio_context;
1740
1741 if (!state->old_bs) {
1742 return;
1743 }
1744
1745 aio_context = bdrv_get_aio_context(state->old_bs);
1746 aio_context_acquire(aio_context);
1747
1748 bdrv_drained_end(state->old_bs);
1749 bdrv_unref(state->new_bs);
1750
1751 aio_context_release(aio_context);
1752 }
1753
1754 typedef struct DriveBackupState {
1755 BlkActionState common;
1756 BlockDriverState *bs;
1757 BlockJob *job;
1758 } DriveBackupState;
1759
1760 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
1761 Error **errp);
1762
1763 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1764 {
1765 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1766 BlockDriverState *bs;
1767 DriveBackup *backup;
1768 AioContext *aio_context;
1769 Error *local_err = NULL;
1770
1771 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1772 backup = common->action->u.drive_backup.data;
1773
1774 bs = qmp_get_root_bs(backup->device, errp);
1775 if (!bs) {
1776 return;
1777 }
1778
1779 aio_context = bdrv_get_aio_context(bs);
1780 aio_context_acquire(aio_context);
1781
1782 /* Paired with .clean() */
1783 bdrv_drained_begin(bs);
1784
1785 state->bs = bs;
1786
1787 state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
1788 if (local_err) {
1789 error_propagate(errp, local_err);
1790 goto out;
1791 }
1792
1793 out:
1794 aio_context_release(aio_context);
1795 }
1796
1797 static void drive_backup_commit(BlkActionState *common)
1798 {
1799 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1800 AioContext *aio_context;
1801
1802 aio_context = bdrv_get_aio_context(state->bs);
1803 aio_context_acquire(aio_context);
1804
1805 assert(state->job);
1806 job_start(&state->job->job);
1807
1808 aio_context_release(aio_context);
1809 }
1810
1811 static void drive_backup_abort(BlkActionState *common)
1812 {
1813 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1814
1815 if (state->job) {
1816 AioContext *aio_context;
1817
1818 aio_context = bdrv_get_aio_context(state->bs);
1819 aio_context_acquire(aio_context);
1820
1821 job_cancel_sync(&state->job->job);
1822
1823 aio_context_release(aio_context);
1824 }
1825 }
1826
1827 static void drive_backup_clean(BlkActionState *common)
1828 {
1829 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1830 AioContext *aio_context;
1831
1832 if (!state->bs) {
1833 return;
1834 }
1835
1836 aio_context = bdrv_get_aio_context(state->bs);
1837 aio_context_acquire(aio_context);
1838
1839 bdrv_drained_end(state->bs);
1840
1841 aio_context_release(aio_context);
1842 }
1843
1844 typedef struct BlockdevBackupState {
1845 BlkActionState common;
1846 BlockDriverState *bs;
1847 BlockJob *job;
1848 } BlockdevBackupState;
1849
1850 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
1851 Error **errp);
1852
1853 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1854 {
1855 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1856 BlockdevBackup *backup;
1857 BlockDriverState *bs, *target;
1858 AioContext *aio_context;
1859 Error *local_err = NULL;
1860
1861 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1862 backup = common->action->u.blockdev_backup.data;
1863
1864 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1865 if (!bs) {
1866 return;
1867 }
1868
1869 target = bdrv_lookup_bs(backup->target, backup->target, errp);
1870 if (!target) {
1871 return;
1872 }
1873
1874 aio_context = bdrv_get_aio_context(bs);
1875 if (aio_context != bdrv_get_aio_context(target)) {
1876 error_setg(errp, "Backup between two IO threads is not implemented");
1877 return;
1878 }
1879 aio_context_acquire(aio_context);
1880 state->bs = bs;
1881
1882 /* Paired with .clean() */
1883 bdrv_drained_begin(state->bs);
1884
1885 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
1886 if (local_err) {
1887 error_propagate(errp, local_err);
1888 goto out;
1889 }
1890
1891 out:
1892 aio_context_release(aio_context);
1893 }
1894
1895 static void blockdev_backup_commit(BlkActionState *common)
1896 {
1897 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1898 AioContext *aio_context;
1899
1900 aio_context = bdrv_get_aio_context(state->bs);
1901 aio_context_acquire(aio_context);
1902
1903 assert(state->job);
1904 job_start(&state->job->job);
1905
1906 aio_context_release(aio_context);
1907 }
1908
1909 static void blockdev_backup_abort(BlkActionState *common)
1910 {
1911 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1912
1913 if (state->job) {
1914 AioContext *aio_context;
1915
1916 aio_context = bdrv_get_aio_context(state->bs);
1917 aio_context_acquire(aio_context);
1918
1919 job_cancel_sync(&state->job->job);
1920
1921 aio_context_release(aio_context);
1922 }
1923 }
1924
1925 static void blockdev_backup_clean(BlkActionState *common)
1926 {
1927 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1928 AioContext *aio_context;
1929
1930 if (!state->bs) {
1931 return;
1932 }
1933
1934 aio_context = bdrv_get_aio_context(state->bs);
1935 aio_context_acquire(aio_context);
1936
1937 bdrv_drained_end(state->bs);
1938
1939 aio_context_release(aio_context);
1940 }
1941
1942 typedef struct BlockDirtyBitmapState {
1943 BlkActionState common;
1944 BdrvDirtyBitmap *bitmap;
1945 BlockDriverState *bs;
1946 HBitmap *backup;
1947 bool prepared;
1948 bool was_enabled;
1949 } BlockDirtyBitmapState;
1950
1951 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
1952 Error **errp)
1953 {
1954 Error *local_err = NULL;
1955 BlockDirtyBitmapAdd *action;
1956 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1957 common, common);
1958
1959 if (action_check_completion_mode(common, errp) < 0) {
1960 return;
1961 }
1962
1963 action = common->action->u.block_dirty_bitmap_add.data;
1964 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1965 qmp_block_dirty_bitmap_add(action->node, action->name,
1966 action->has_granularity, action->granularity,
1967 action->has_persistent, action->persistent,
1968 action->has_autoload, action->autoload,
1969 action->has_disabled, action->disabled,
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 errp);
2010 if (!state->bitmap) {
2011 return;
2012 }
2013
2014 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
2015 return;
2016 }
2017
2018 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2019 }
2020
2021 static void block_dirty_bitmap_restore(BlkActionState *common)
2022 {
2023 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2024 common, common);
2025
2026 if (state->backup) {
2027 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
2028 }
2029 }
2030
2031 static void block_dirty_bitmap_free_backup(BlkActionState *common)
2032 {
2033 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2034 common, common);
2035
2036 hbitmap_free(state->backup);
2037 }
2038
2039 static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
2040 Error **errp)
2041 {
2042 BlockDirtyBitmap *action;
2043 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2044 common, common);
2045
2046 if (action_check_completion_mode(common, errp) < 0) {
2047 return;
2048 }
2049
2050 action = common->action->u.block_dirty_bitmap_enable.data;
2051 state->bitmap = block_dirty_bitmap_lookup(action->node,
2052 action->name,
2053 NULL,
2054 errp);
2055 if (!state->bitmap) {
2056 return;
2057 }
2058
2059 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2060 return;
2061 }
2062
2063 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2064 bdrv_enable_dirty_bitmap(state->bitmap);
2065 }
2066
2067 static void block_dirty_bitmap_enable_abort(BlkActionState *common)
2068 {
2069 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2070 common, common);
2071
2072 if (!state->was_enabled) {
2073 bdrv_disable_dirty_bitmap(state->bitmap);
2074 }
2075 }
2076
2077 static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
2078 Error **errp)
2079 {
2080 BlockDirtyBitmap *action;
2081 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2082 common, common);
2083
2084 if (action_check_completion_mode(common, errp) < 0) {
2085 return;
2086 }
2087
2088 action = common->action->u.block_dirty_bitmap_disable.data;
2089 state->bitmap = block_dirty_bitmap_lookup(action->node,
2090 action->name,
2091 NULL,
2092 errp);
2093 if (!state->bitmap) {
2094 return;
2095 }
2096
2097 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2098 return;
2099 }
2100
2101 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2102 bdrv_disable_dirty_bitmap(state->bitmap);
2103 }
2104
2105 static void block_dirty_bitmap_disable_abort(BlkActionState *common)
2106 {
2107 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2108 common, common);
2109
2110 if (state->was_enabled) {
2111 bdrv_enable_dirty_bitmap(state->bitmap);
2112 }
2113 }
2114
2115 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(const char *node,
2116 const char *target,
2117 strList *bitmaps,
2118 HBitmap **backup,
2119 Error **errp);
2120
2121 static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
2122 Error **errp)
2123 {
2124 BlockDirtyBitmapMerge *action;
2125 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2126 common, common);
2127
2128 if (action_check_completion_mode(common, errp) < 0) {
2129 return;
2130 }
2131
2132 action = common->action->u.block_dirty_bitmap_merge.data;
2133
2134 state->bitmap = do_block_dirty_bitmap_merge(action->node, action->target,
2135 action->bitmaps, &state->backup,
2136 errp);
2137 }
2138
2139 static void abort_prepare(BlkActionState *common, Error **errp)
2140 {
2141 error_setg(errp, "Transaction aborted using Abort action");
2142 }
2143
2144 static void abort_commit(BlkActionState *common)
2145 {
2146 g_assert_not_reached(); /* this action never succeeds */
2147 }
2148
2149 static const BlkActionOps actions[] = {
2150 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2151 .instance_size = sizeof(ExternalSnapshotState),
2152 .prepare = external_snapshot_prepare,
2153 .commit = external_snapshot_commit,
2154 .abort = external_snapshot_abort,
2155 .clean = external_snapshot_clean,
2156 },
2157 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2158 .instance_size = sizeof(ExternalSnapshotState),
2159 .prepare = external_snapshot_prepare,
2160 .commit = external_snapshot_commit,
2161 .abort = external_snapshot_abort,
2162 .clean = external_snapshot_clean,
2163 },
2164 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2165 .instance_size = sizeof(DriveBackupState),
2166 .prepare = drive_backup_prepare,
2167 .commit = drive_backup_commit,
2168 .abort = drive_backup_abort,
2169 .clean = drive_backup_clean,
2170 },
2171 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2172 .instance_size = sizeof(BlockdevBackupState),
2173 .prepare = blockdev_backup_prepare,
2174 .commit = blockdev_backup_commit,
2175 .abort = blockdev_backup_abort,
2176 .clean = blockdev_backup_clean,
2177 },
2178 [TRANSACTION_ACTION_KIND_ABORT] = {
2179 .instance_size = sizeof(BlkActionState),
2180 .prepare = abort_prepare,
2181 .commit = abort_commit,
2182 },
2183 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2184 .instance_size = sizeof(InternalSnapshotState),
2185 .prepare = internal_snapshot_prepare,
2186 .abort = internal_snapshot_abort,
2187 .clean = internal_snapshot_clean,
2188 },
2189 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2190 .instance_size = sizeof(BlockDirtyBitmapState),
2191 .prepare = block_dirty_bitmap_add_prepare,
2192 .abort = block_dirty_bitmap_add_abort,
2193 },
2194 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2195 .instance_size = sizeof(BlockDirtyBitmapState),
2196 .prepare = block_dirty_bitmap_clear_prepare,
2197 .commit = block_dirty_bitmap_free_backup,
2198 .abort = block_dirty_bitmap_restore,
2199 },
2200 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = {
2201 .instance_size = sizeof(BlockDirtyBitmapState),
2202 .prepare = block_dirty_bitmap_enable_prepare,
2203 .abort = block_dirty_bitmap_enable_abort,
2204 },
2205 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = {
2206 .instance_size = sizeof(BlockDirtyBitmapState),
2207 .prepare = block_dirty_bitmap_disable_prepare,
2208 .abort = block_dirty_bitmap_disable_abort,
2209 },
2210 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = {
2211 .instance_size = sizeof(BlockDirtyBitmapState),
2212 .prepare = block_dirty_bitmap_merge_prepare,
2213 .commit = block_dirty_bitmap_free_backup,
2214 .abort = block_dirty_bitmap_restore,
2215 },
2216 /* Where are transactions for MIRROR, COMMIT and STREAM?
2217 * Although these blockjobs use transaction callbacks like the backup job,
2218 * these jobs do not necessarily adhere to transaction semantics.
2219 * These jobs may not fully undo all of their actions on abort, nor do they
2220 * necessarily work in transactions with more than one job in them.
2221 */
2222 };
2223
2224 /**
2225 * Allocate a TransactionProperties structure if necessary, and fill
2226 * that structure with desired defaults if they are unset.
2227 */
2228 static TransactionProperties *get_transaction_properties(
2229 TransactionProperties *props)
2230 {
2231 if (!props) {
2232 props = g_new0(TransactionProperties, 1);
2233 }
2234
2235 if (!props->has_completion_mode) {
2236 props->has_completion_mode = true;
2237 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2238 }
2239
2240 return props;
2241 }
2242
2243 /*
2244 * 'Atomic' group operations. The operations are performed as a set, and if
2245 * any fail then we roll back all operations in the group.
2246 */
2247 void qmp_transaction(TransactionActionList *dev_list,
2248 bool has_props,
2249 struct TransactionProperties *props,
2250 Error **errp)
2251 {
2252 TransactionActionList *dev_entry = dev_list;
2253 JobTxn *block_job_txn = NULL;
2254 BlkActionState *state, *next;
2255 Error *local_err = NULL;
2256
2257 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states;
2258 QTAILQ_INIT(&snap_bdrv_states);
2259
2260 /* Does this transaction get canceled as a group on failure?
2261 * If not, we don't really need to make a JobTxn.
2262 */
2263 props = get_transaction_properties(props);
2264 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2265 block_job_txn = job_txn_new();
2266 }
2267
2268 /* drain all i/o before any operations */
2269 bdrv_drain_all();
2270
2271 /* We don't do anything in this loop that commits us to the operations */
2272 while (NULL != dev_entry) {
2273 TransactionAction *dev_info = NULL;
2274 const BlkActionOps *ops;
2275
2276 dev_info = dev_entry->value;
2277 dev_entry = dev_entry->next;
2278
2279 assert(dev_info->type < ARRAY_SIZE(actions));
2280
2281 ops = &actions[dev_info->type];
2282 assert(ops->instance_size > 0);
2283
2284 state = g_malloc0(ops->instance_size);
2285 state->ops = ops;
2286 state->action = dev_info;
2287 state->block_job_txn = block_job_txn;
2288 state->txn_props = props;
2289 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2290
2291 state->ops->prepare(state, &local_err);
2292 if (local_err) {
2293 error_propagate(errp, local_err);
2294 goto delete_and_fail;
2295 }
2296 }
2297
2298 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) {
2299 if (state->ops->commit) {
2300 state->ops->commit(state);
2301 }
2302 }
2303
2304 /* success */
2305 goto exit;
2306
2307 delete_and_fail:
2308 /* failure, and it is all-or-none; roll back all operations */
2309 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) {
2310 if (state->ops->abort) {
2311 state->ops->abort(state);
2312 }
2313 }
2314 exit:
2315 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2316 if (state->ops->clean) {
2317 state->ops->clean(state);
2318 }
2319 g_free(state);
2320 }
2321 if (!has_props) {
2322 qapi_free_TransactionProperties(props);
2323 }
2324 job_txn_unref(block_job_txn);
2325 }
2326
2327 void qmp_eject(bool has_device, const char *device,
2328 bool has_id, const char *id,
2329 bool has_force, bool force, Error **errp)
2330 {
2331 Error *local_err = NULL;
2332 int rc;
2333
2334 if (!has_force) {
2335 force = false;
2336 }
2337
2338 rc = do_open_tray(has_device ? device : NULL,
2339 has_id ? id : NULL,
2340 force, &local_err);
2341 if (rc && rc != -ENOSYS) {
2342 error_propagate(errp, local_err);
2343 return;
2344 }
2345 error_free(local_err);
2346
2347 blockdev_remove_medium(has_device, device, has_id, id, errp);
2348 }
2349
2350 void qmp_block_passwd(bool has_device, const char *device,
2351 bool has_node_name, const char *node_name,
2352 const char *password, Error **errp)
2353 {
2354 error_setg(errp,
2355 "Setting block passwords directly is no longer supported");
2356 }
2357
2358 /*
2359 * Attempt to open the tray of @device.
2360 * If @force, ignore its tray lock.
2361 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2362 * On error, store an error through @errp and return -errno.
2363 * If @device does not exist, return -ENODEV.
2364 * If it has no removable media, return -ENOTSUP.
2365 * If it has no tray, return -ENOSYS.
2366 * If the guest was asked to open the tray, return -EINPROGRESS.
2367 * Else, return 0.
2368 */
2369 static int do_open_tray(const char *blk_name, const char *qdev_id,
2370 bool force, Error **errp)
2371 {
2372 BlockBackend *blk;
2373 const char *device = qdev_id ?: blk_name;
2374 bool locked;
2375
2376 blk = qmp_get_blk(blk_name, qdev_id, errp);
2377 if (!blk) {
2378 return -ENODEV;
2379 }
2380
2381 if (!blk_dev_has_removable_media(blk)) {
2382 error_setg(errp, "Device '%s' is not removable", device);
2383 return -ENOTSUP;
2384 }
2385
2386 if (!blk_dev_has_tray(blk)) {
2387 error_setg(errp, "Device '%s' does not have a tray", device);
2388 return -ENOSYS;
2389 }
2390
2391 if (blk_dev_is_tray_open(blk)) {
2392 return 0;
2393 }
2394
2395 locked = blk_dev_is_medium_locked(blk);
2396 if (locked) {
2397 blk_dev_eject_request(blk, force);
2398 }
2399
2400 if (!locked || force) {
2401 blk_dev_change_media_cb(blk, false, &error_abort);
2402 }
2403
2404 if (locked && !force) {
2405 error_setg(errp, "Device '%s' is locked and force was not specified, "
2406 "wait for tray to open and try again", device);
2407 return -EINPROGRESS;
2408 }
2409
2410 return 0;
2411 }
2412
2413 void qmp_blockdev_open_tray(bool has_device, const char *device,
2414 bool has_id, const char *id,
2415 bool has_force, bool force,
2416 Error **errp)
2417 {
2418 Error *local_err = NULL;
2419 int rc;
2420
2421 if (!has_force) {
2422 force = false;
2423 }
2424 rc = do_open_tray(has_device ? device : NULL,
2425 has_id ? id : NULL,
2426 force, &local_err);
2427 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
2428 error_propagate(errp, local_err);
2429 return;
2430 }
2431 error_free(local_err);
2432 }
2433
2434 void qmp_blockdev_close_tray(bool has_device, const char *device,
2435 bool has_id, const char *id,
2436 Error **errp)
2437 {
2438 BlockBackend *blk;
2439 Error *local_err = NULL;
2440
2441 device = has_device ? device : NULL;
2442 id = has_id ? id : NULL;
2443
2444 blk = qmp_get_blk(device, id, errp);
2445 if (!blk) {
2446 return;
2447 }
2448
2449 if (!blk_dev_has_removable_media(blk)) {
2450 error_setg(errp, "Device '%s' is not removable", device ?: id);
2451 return;
2452 }
2453
2454 if (!blk_dev_has_tray(blk)) {
2455 /* Ignore this command on tray-less devices */
2456 return;
2457 }
2458
2459 if (!blk_dev_is_tray_open(blk)) {
2460 return;
2461 }
2462
2463 blk_dev_change_media_cb(blk, true, &local_err);
2464 if (local_err) {
2465 error_propagate(errp, local_err);
2466 return;
2467 }
2468 }
2469
2470 static void blockdev_remove_medium(bool has_device, const char *device,
2471 bool has_id, const char *id, Error **errp)
2472 {
2473 BlockBackend *blk;
2474 BlockDriverState *bs;
2475 AioContext *aio_context;
2476 bool has_attached_device;
2477
2478 device = has_device ? device : NULL;
2479 id = has_id ? id : NULL;
2480
2481 blk = qmp_get_blk(device, id, errp);
2482 if (!blk) {
2483 return;
2484 }
2485
2486 /* For BBs without a device, we can exchange the BDS tree at will */
2487 has_attached_device = blk_get_attached_dev(blk);
2488
2489 if (has_attached_device && !blk_dev_has_removable_media(blk)) {
2490 error_setg(errp, "Device '%s' is not removable", device ?: id);
2491 return;
2492 }
2493
2494 if (has_attached_device && blk_dev_has_tray(blk) &&
2495 !blk_dev_is_tray_open(blk))
2496 {
2497 error_setg(errp, "Tray of device '%s' is not open", device ?: id);
2498 return;
2499 }
2500
2501 bs = blk_bs(blk);
2502 if (!bs) {
2503 return;
2504 }
2505
2506 aio_context = bdrv_get_aio_context(bs);
2507 aio_context_acquire(aio_context);
2508
2509 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2510 goto out;
2511 }
2512
2513 blk_remove_bs(blk);
2514
2515 if (!blk_dev_has_tray(blk)) {
2516 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2517 * called at all); therefore, the medium needs to be ejected here.
2518 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2519 * value passed here (i.e. false). */
2520 blk_dev_change_media_cb(blk, false, &error_abort);
2521 }
2522
2523 out:
2524 aio_context_release(aio_context);
2525 }
2526
2527 void qmp_blockdev_remove_medium(const char *id, Error **errp)
2528 {
2529 blockdev_remove_medium(false, NULL, true, id, errp);
2530 }
2531
2532 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2533 BlockDriverState *bs, Error **errp)
2534 {
2535 Error *local_err = NULL;
2536 bool has_device;
2537 int ret;
2538
2539 /* For BBs without a device, we can exchange the BDS tree at will */
2540 has_device = blk_get_attached_dev(blk);
2541
2542 if (has_device && !blk_dev_has_removable_media(blk)) {
2543 error_setg(errp, "Device is not removable");
2544 return;
2545 }
2546
2547 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2548 error_setg(errp, "Tray of the device is not open");
2549 return;
2550 }
2551
2552 if (blk_bs(blk)) {
2553 error_setg(errp, "There already is a medium in the device");
2554 return;
2555 }
2556
2557 ret = blk_insert_bs(blk, bs, errp);
2558 if (ret < 0) {
2559 return;
2560 }
2561
2562 if (!blk_dev_has_tray(blk)) {
2563 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2564 * called at all); therefore, the medium needs to be pushed into the
2565 * slot here.
2566 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2567 * value passed here (i.e. true). */
2568 blk_dev_change_media_cb(blk, true, &local_err);
2569 if (local_err) {
2570 error_propagate(errp, local_err);
2571 blk_remove_bs(blk);
2572 return;
2573 }
2574 }
2575 }
2576
2577 static void blockdev_insert_medium(bool has_device, const char *device,
2578 bool has_id, const char *id,
2579 const char *node_name, Error **errp)
2580 {
2581 BlockBackend *blk;
2582 BlockDriverState *bs;
2583
2584 blk = qmp_get_blk(has_device ? device : NULL,
2585 has_id ? id : NULL,
2586 errp);
2587 if (!blk) {
2588 return;
2589 }
2590
2591 bs = bdrv_find_node(node_name);
2592 if (!bs) {
2593 error_setg(errp, "Node '%s' not found", node_name);
2594 return;
2595 }
2596
2597 if (bdrv_has_blk(bs)) {
2598 error_setg(errp, "Node '%s' is already in use", node_name);
2599 return;
2600 }
2601
2602 qmp_blockdev_insert_anon_medium(blk, bs, errp);
2603 }
2604
2605 void qmp_blockdev_insert_medium(const char *id, const char *node_name,
2606 Error **errp)
2607 {
2608 blockdev_insert_medium(false, NULL, true, id, node_name, errp);
2609 }
2610
2611 void qmp_blockdev_change_medium(bool has_device, const char *device,
2612 bool has_id, const char *id,
2613 const char *filename,
2614 bool has_format, const char *format,
2615 bool has_read_only,
2616 BlockdevChangeReadOnlyMode read_only,
2617 Error **errp)
2618 {
2619 BlockBackend *blk;
2620 BlockDriverState *medium_bs = NULL;
2621 int bdrv_flags;
2622 bool detect_zeroes;
2623 int rc;
2624 QDict *options = NULL;
2625 Error *err = NULL;
2626
2627 blk = qmp_get_blk(has_device ? device : NULL,
2628 has_id ? id : NULL,
2629 errp);
2630 if (!blk) {
2631 goto fail;
2632 }
2633
2634 if (blk_bs(blk)) {
2635 blk_update_root_state(blk);
2636 }
2637
2638 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2639 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2640 BDRV_O_PROTOCOL | BDRV_O_AUTO_RDONLY);
2641
2642 if (!has_read_only) {
2643 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2644 }
2645
2646 switch (read_only) {
2647 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2648 break;
2649
2650 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2651 bdrv_flags &= ~BDRV_O_RDWR;
2652 break;
2653
2654 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2655 bdrv_flags |= BDRV_O_RDWR;
2656 break;
2657
2658 default:
2659 abort();
2660 }
2661
2662 options = qdict_new();
2663 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2664 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
2665
2666 if (has_format) {
2667 qdict_put_str(options, "driver", format);
2668 }
2669
2670 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
2671 if (!medium_bs) {
2672 goto fail;
2673 }
2674
2675 rc = do_open_tray(has_device ? device : NULL,
2676 has_id ? id : NULL,
2677 false, &err);
2678 if (rc && rc != -ENOSYS) {
2679 error_propagate(errp, err);
2680 goto fail;
2681 }
2682 error_free(err);
2683 err = NULL;
2684
2685 blockdev_remove_medium(has_device, device, has_id, id, &err);
2686 if (err) {
2687 error_propagate(errp, err);
2688 goto fail;
2689 }
2690
2691 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2692 if (err) {
2693 error_propagate(errp, err);
2694 goto fail;
2695 }
2696
2697 qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2698
2699 fail:
2700 /* If the medium has been inserted, the device has its own reference, so
2701 * ours must be relinquished; and if it has not been inserted successfully,
2702 * the reference must be relinquished anyway */
2703 bdrv_unref(medium_bs);
2704 }
2705
2706 /* throttling disk I/O limits */
2707 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2708 {
2709 ThrottleConfig cfg;
2710 BlockDriverState *bs;
2711 BlockBackend *blk;
2712 AioContext *aio_context;
2713
2714 blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
2715 arg->has_id ? arg->id : NULL,
2716 errp);
2717 if (!blk) {
2718 return;
2719 }
2720
2721 aio_context = blk_get_aio_context(blk);
2722 aio_context_acquire(aio_context);
2723
2724 bs = blk_bs(blk);
2725 if (!bs) {
2726 error_setg(errp, "Device has no medium");
2727 goto out;
2728 }
2729
2730 throttle_config_init(&cfg);
2731 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
2732 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd;
2733 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
2734
2735 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
2736 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd;
2737 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
2738
2739 if (arg->has_bps_max) {
2740 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2741 }
2742 if (arg->has_bps_rd_max) {
2743 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2744 }
2745 if (arg->has_bps_wr_max) {
2746 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2747 }
2748 if (arg->has_iops_max) {
2749 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2750 }
2751 if (arg->has_iops_rd_max) {
2752 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2753 }
2754 if (arg->has_iops_wr_max) {
2755 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2756 }
2757
2758 if (arg->has_bps_max_length) {
2759 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2760 }
2761 if (arg->has_bps_rd_max_length) {
2762 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2763 }
2764 if (arg->has_bps_wr_max_length) {
2765 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2766 }
2767 if (arg->has_iops_max_length) {
2768 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2769 }
2770 if (arg->has_iops_rd_max_length) {
2771 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2772 }
2773 if (arg->has_iops_wr_max_length) {
2774 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2775 }
2776
2777 if (arg->has_iops_size) {
2778 cfg.op_size = arg->iops_size;
2779 }
2780
2781 if (!throttle_is_valid(&cfg, errp)) {
2782 goto out;
2783 }
2784
2785 if (throttle_enabled(&cfg)) {
2786 /* Enable I/O limits if they're not enabled yet, otherwise
2787 * just update the throttling group. */
2788 if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
2789 blk_io_limits_enable(blk,
2790 arg->has_group ? arg->group :
2791 arg->has_device ? arg->device :
2792 arg->id);
2793 } else if (arg->has_group) {
2794 blk_io_limits_update_group(blk, arg->group);
2795 }
2796 /* Set the new throttling configuration */
2797 blk_set_io_limits(blk, &cfg);
2798 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
2799 /* If all throttling settings are set to 0, disable I/O limits */
2800 blk_io_limits_disable(blk);
2801 }
2802
2803 out:
2804 aio_context_release(aio_context);
2805 }
2806
2807 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2808 bool has_granularity, uint32_t granularity,
2809 bool has_persistent, bool persistent,
2810 bool has_autoload, bool autoload,
2811 bool has_disabled, bool disabled,
2812 Error **errp)
2813 {
2814 BlockDriverState *bs;
2815 BdrvDirtyBitmap *bitmap;
2816 AioContext *aio_context = NULL;
2817
2818 if (!name || name[0] == '\0') {
2819 error_setg(errp, "Bitmap name cannot be empty");
2820 return;
2821 }
2822
2823 bs = bdrv_lookup_bs(node, node, errp);
2824 if (!bs) {
2825 return;
2826 }
2827
2828 if (has_granularity) {
2829 if (granularity < 512 || !is_power_of_2(granularity)) {
2830 error_setg(errp, "Granularity must be power of 2 "
2831 "and at least 512");
2832 return;
2833 }
2834 } else {
2835 /* Default to cluster size, if available: */
2836 granularity = bdrv_get_default_bitmap_granularity(bs);
2837 }
2838
2839 if (!has_persistent) {
2840 persistent = false;
2841 }
2842
2843 if (has_autoload) {
2844 warn_report("Autoload option is deprecated and its value is ignored");
2845 }
2846
2847 if (!has_disabled) {
2848 disabled = false;
2849 }
2850
2851 if (persistent) {
2852 aio_context = bdrv_get_aio_context(bs);
2853 aio_context_acquire(aio_context);
2854 if (!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) {
2855 goto out;
2856 }
2857 }
2858
2859 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2860 if (bitmap == NULL) {
2861 goto out;
2862 }
2863
2864 if (disabled) {
2865 bdrv_disable_dirty_bitmap(bitmap);
2866 }
2867
2868 bdrv_dirty_bitmap_set_persistence(bitmap, persistent);
2869 out:
2870 if (aio_context) {
2871 aio_context_release(aio_context);
2872 }
2873 }
2874
2875 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2876 Error **errp)
2877 {
2878 BlockDriverState *bs;
2879 BdrvDirtyBitmap *bitmap;
2880 Error *local_err = NULL;
2881 AioContext *aio_context = NULL;
2882
2883 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2884 if (!bitmap || !bs) {
2885 return;
2886 }
2887
2888 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO,
2889 errp)) {
2890 return;
2891 }
2892
2893 if (bdrv_dirty_bitmap_get_persistence(bitmap)) {
2894 aio_context = bdrv_get_aio_context(bs);
2895 aio_context_acquire(aio_context);
2896 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
2897 if (local_err != NULL) {
2898 error_propagate(errp, local_err);
2899 goto out;
2900 }
2901 }
2902
2903 bdrv_release_dirty_bitmap(bs, bitmap);
2904 out:
2905 if (aio_context) {
2906 aio_context_release(aio_context);
2907 }
2908 }
2909
2910 /**
2911 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2912 * immediately after a full backup operation.
2913 */
2914 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2915 Error **errp)
2916 {
2917 BdrvDirtyBitmap *bitmap;
2918 BlockDriverState *bs;
2919
2920 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2921 if (!bitmap || !bs) {
2922 return;
2923 }
2924
2925 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) {
2926 return;
2927 }
2928
2929 bdrv_clear_dirty_bitmap(bitmap, NULL);
2930 }
2931
2932 void qmp_block_dirty_bitmap_enable(const char *node, const char *name,
2933 Error **errp)
2934 {
2935 BlockDriverState *bs;
2936 BdrvDirtyBitmap *bitmap;
2937
2938 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2939 if (!bitmap) {
2940 return;
2941 }
2942
2943 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2944 return;
2945 }
2946
2947 bdrv_enable_dirty_bitmap(bitmap);
2948 }
2949
2950 void qmp_block_dirty_bitmap_disable(const char *node, const char *name,
2951 Error **errp)
2952 {
2953 BlockDriverState *bs;
2954 BdrvDirtyBitmap *bitmap;
2955
2956 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2957 if (!bitmap) {
2958 return;
2959 }
2960
2961 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2962 return;
2963 }
2964
2965 bdrv_disable_dirty_bitmap(bitmap);
2966 }
2967
2968 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(const char *node,
2969 const char *target,
2970 strList *bitmaps,
2971 HBitmap **backup,
2972 Error **errp)
2973 {
2974 BlockDriverState *bs;
2975 BdrvDirtyBitmap *dst, *src, *anon;
2976 strList *lst;
2977 Error *local_err = NULL;
2978
2979 dst = block_dirty_bitmap_lookup(node, target, &bs, errp);
2980 if (!dst) {
2981 return NULL;
2982 }
2983
2984 anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst),
2985 NULL, errp);
2986 if (!anon) {
2987 return NULL;
2988 }
2989
2990 for (lst = bitmaps; lst; lst = lst->next) {
2991 src = bdrv_find_dirty_bitmap(bs, lst->value);
2992 if (!src) {
2993 error_setg(errp, "Dirty bitmap '%s' not found", lst->value);
2994 dst = NULL;
2995 goto out;
2996 }
2997
2998 bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err);
2999 if (local_err) {
3000 error_propagate(errp, local_err);
3001 dst = NULL;
3002 goto out;
3003 }
3004 }
3005
3006 /* Merge into dst; dst is unchanged on failure. */
3007 bdrv_merge_dirty_bitmap(dst, anon, backup, errp);
3008
3009 out:
3010 bdrv_release_dirty_bitmap(bs, anon);
3011 return dst;
3012 }
3013
3014 void qmp_block_dirty_bitmap_merge(const char *node, const char *target,
3015 strList *bitmaps, Error **errp)
3016 {
3017 do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp);
3018 }
3019
3020 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
3021 const char *name,
3022 Error **errp)
3023 {
3024 BdrvDirtyBitmap *bitmap;
3025 BlockDriverState *bs;
3026 BlockDirtyBitmapSha256 *ret = NULL;
3027 char *sha256;
3028
3029 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
3030 if (!bitmap || !bs) {
3031 return NULL;
3032 }
3033
3034 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
3035 if (sha256 == NULL) {
3036 return NULL;
3037 }
3038
3039 ret = g_new(BlockDirtyBitmapSha256, 1);
3040 ret->sha256 = sha256;
3041
3042 return ret;
3043 }
3044
3045 void hmp_drive_del(Monitor *mon, const QDict *qdict)
3046 {
3047 const char *id = qdict_get_str(qdict, "id");
3048 BlockBackend *blk;
3049 BlockDriverState *bs;
3050 AioContext *aio_context;
3051 Error *local_err = NULL;
3052
3053 bs = bdrv_find_node(id);
3054 if (bs) {
3055 qmp_blockdev_del(id, &local_err);
3056 if (local_err) {
3057 error_report_err(local_err);
3058 }
3059 return;
3060 }
3061
3062 blk = blk_by_name(id);
3063 if (!blk) {
3064 error_report("Device '%s' not found", id);
3065 return;
3066 }
3067
3068 if (!blk_legacy_dinfo(blk)) {
3069 error_report("Deleting device added with blockdev-add"
3070 " is not supported");
3071 return;
3072 }
3073
3074 aio_context = blk_get_aio_context(blk);
3075 aio_context_acquire(aio_context);
3076
3077 bs = blk_bs(blk);
3078 if (bs) {
3079 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
3080 error_report_err(local_err);
3081 aio_context_release(aio_context);
3082 return;
3083 }
3084
3085 blk_remove_bs(blk);
3086 }
3087
3088 /* Make the BlockBackend and the attached BlockDriverState anonymous */
3089 monitor_remove_blk(blk);
3090
3091 /* If this BlockBackend has a device attached to it, its refcount will be
3092 * decremented when the device is removed; otherwise we have to do so here.
3093 */
3094 if (blk_get_attached_dev(blk)) {
3095 /* Further I/O must not pause the guest */
3096 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
3097 BLOCKDEV_ON_ERROR_REPORT);
3098 } else {
3099 blk_unref(blk);
3100 }
3101
3102 aio_context_release(aio_context);
3103 }
3104
3105 void qmp_block_resize(bool has_device, const char *device,
3106 bool has_node_name, const char *node_name,
3107 int64_t size, Error **errp)
3108 {
3109 Error *local_err = NULL;
3110 BlockBackend *blk = NULL;
3111 BlockDriverState *bs;
3112 AioContext *aio_context;
3113 int ret;
3114
3115 bs = bdrv_lookup_bs(has_device ? device : NULL,
3116 has_node_name ? node_name : NULL,
3117 &local_err);
3118 if (local_err) {
3119 error_propagate(errp, local_err);
3120 return;
3121 }
3122
3123 aio_context = bdrv_get_aio_context(bs);
3124 aio_context_acquire(aio_context);
3125
3126 if (!bdrv_is_first_non_filter(bs)) {
3127 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
3128 goto out;
3129 }
3130
3131 if (size < 0) {
3132 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
3133 goto out;
3134 }
3135
3136 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
3137 error_setg(errp, QERR_DEVICE_IN_USE, device);
3138 goto out;
3139 }
3140
3141 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
3142 ret = blk_insert_bs(blk, bs, errp);
3143 if (ret < 0) {
3144 goto out;
3145 }
3146
3147 bdrv_drained_begin(bs);
3148 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
3149 bdrv_drained_end(bs);
3150
3151 out:
3152 blk_unref(blk);
3153 aio_context_release(aio_context);
3154 }
3155
3156 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
3157 bool has_base, const char *base,
3158 bool has_base_node, const char *base_node,
3159 bool has_backing_file, const char *backing_file,
3160 bool has_speed, int64_t speed,
3161 bool has_on_error, BlockdevOnError on_error,
3162 bool has_auto_finalize, bool auto_finalize,
3163 bool has_auto_dismiss, bool auto_dismiss,
3164 Error **errp)
3165 {
3166 BlockDriverState *bs, *iter;
3167 BlockDriverState *base_bs = NULL;
3168 AioContext *aio_context;
3169 Error *local_err = NULL;
3170 const char *base_name = NULL;
3171 int job_flags = JOB_DEFAULT;
3172
3173 if (!has_on_error) {
3174 on_error = BLOCKDEV_ON_ERROR_REPORT;
3175 }
3176
3177 bs = bdrv_lookup_bs(device, device, errp);
3178 if (!bs) {
3179 return;
3180 }
3181
3182 aio_context = bdrv_get_aio_context(bs);
3183 aio_context_acquire(aio_context);
3184
3185 if (has_base && has_base_node) {
3186 error_setg(errp, "'base' and 'base-node' cannot be specified "
3187 "at the same time");
3188 goto out;
3189 }
3190
3191 if (has_base) {
3192 base_bs = bdrv_find_backing_image(bs, base);
3193 if (base_bs == NULL) {
3194 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3195 goto out;
3196 }
3197 assert(bdrv_get_aio_context(base_bs) == aio_context);
3198 base_name = base;
3199 }
3200
3201 if (has_base_node) {
3202 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3203 if (!base_bs) {
3204 goto out;
3205 }
3206 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
3207 error_setg(errp, "Node '%s' is not a backing image of '%s'",
3208 base_node, device);
3209 goto out;
3210 }
3211 assert(bdrv_get_aio_context(base_bs) == aio_context);
3212 bdrv_refresh_filename(base_bs);
3213 base_name = base_bs->filename;
3214 }
3215
3216 /* Check for op blockers in the whole chain between bs and base */
3217 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
3218 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
3219 goto out;
3220 }
3221 }
3222
3223 /* if we are streaming the entire chain, the result will have no backing
3224 * file, and specifying one is therefore an error */
3225 if (base_bs == NULL && has_backing_file) {
3226 error_setg(errp, "backing file specified, but streaming the "
3227 "entire chain");
3228 goto out;
3229 }
3230
3231 /* backing_file string overrides base bs filename */
3232 base_name = has_backing_file ? backing_file : base_name;
3233
3234 if (has_auto_finalize && !auto_finalize) {
3235 job_flags |= JOB_MANUAL_FINALIZE;
3236 }
3237 if (has_auto_dismiss && !auto_dismiss) {
3238 job_flags |= JOB_MANUAL_DISMISS;
3239 }
3240
3241 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
3242 job_flags, has_speed ? speed : 0, on_error, &local_err);
3243 if (local_err) {
3244 error_propagate(errp, local_err);
3245 goto out;
3246 }
3247
3248 trace_qmp_block_stream(bs, bs->job);
3249
3250 out:
3251 aio_context_release(aio_context);
3252 }
3253
3254 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3255 bool has_base_node, const char *base_node,
3256 bool has_base, const char *base,
3257 bool has_top_node, const char *top_node,
3258 bool has_top, const char *top,
3259 bool has_backing_file, const char *backing_file,
3260 bool has_speed, int64_t speed,
3261 bool has_filter_node_name, const char *filter_node_name,
3262 bool has_auto_finalize, bool auto_finalize,
3263 bool has_auto_dismiss, bool auto_dismiss,
3264 Error **errp)
3265 {
3266 BlockDriverState *bs;
3267 BlockDriverState *iter;
3268 BlockDriverState *base_bs, *top_bs;
3269 AioContext *aio_context;
3270 Error *local_err = NULL;
3271 /* This will be part of the QMP command, if/when the
3272 * BlockdevOnError change for blkmirror makes it in
3273 */
3274 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3275 int job_flags = JOB_DEFAULT;
3276
3277 if (!has_speed) {
3278 speed = 0;
3279 }
3280 if (!has_filter_node_name) {
3281 filter_node_name = NULL;
3282 }
3283 if (has_auto_finalize && !auto_finalize) {
3284 job_flags |= JOB_MANUAL_FINALIZE;
3285 }
3286 if (has_auto_dismiss && !auto_dismiss) {
3287 job_flags |= JOB_MANUAL_DISMISS;
3288 }
3289
3290 /* Important Note:
3291 * libvirt relies on the DeviceNotFound error class in order to probe for
3292 * live commit feature versions; for this to work, we must make sure to
3293 * perform the device lookup before any generic errors that may occur in a
3294 * scenario in which all optional arguments are omitted. */
3295 bs = qmp_get_root_bs(device, &local_err);
3296 if (!bs) {
3297 bs = bdrv_lookup_bs(device, device, NULL);
3298 if (!bs) {
3299 error_free(local_err);
3300 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3301 "Device '%s' not found", device);
3302 } else {
3303 error_propagate(errp, local_err);
3304 }
3305 return;
3306 }
3307
3308 aio_context = bdrv_get_aio_context(bs);
3309 aio_context_acquire(aio_context);
3310
3311 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3312 goto out;
3313 }
3314
3315 /* default top_bs is the active layer */
3316 top_bs = bs;
3317
3318 if (has_top_node && has_top) {
3319 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
3320 goto out;
3321 } else if (has_top_node) {
3322 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
3323 if (top_bs == NULL) {
3324 goto out;
3325 }
3326 if (!bdrv_chain_contains(bs, top_bs)) {
3327 error_setg(errp, "'%s' is not in this backing file chain",
3328 top_node);
3329 goto out;
3330 }
3331 } else if (has_top && top) {
3332 /* This strcmp() is just a shortcut, there is no need to
3333 * refresh @bs's filename. If it mismatches,
3334 * bdrv_find_backing_image() will do the refresh and may still
3335 * return @bs. */
3336 if (strcmp(bs->filename, top) != 0) {
3337 top_bs = bdrv_find_backing_image(bs, top);
3338 }
3339 }
3340
3341 if (top_bs == NULL) {
3342 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3343 goto out;
3344 }
3345
3346 assert(bdrv_get_aio_context(top_bs) == aio_context);
3347
3348 if (has_base_node && has_base) {
3349 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
3350 goto out;
3351 } else if (has_base_node) {
3352 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3353 if (base_bs == NULL) {
3354 goto out;
3355 }
3356 if (!bdrv_chain_contains(top_bs, base_bs)) {
3357 error_setg(errp, "'%s' is not in this backing file chain",
3358 base_node);
3359 goto out;
3360 }
3361 } else if (has_base && base) {
3362 base_bs = bdrv_find_backing_image(top_bs, base);
3363 } else {
3364 base_bs = bdrv_find_base(top_bs);
3365 }
3366
3367 if (base_bs == NULL) {
3368 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3369 goto out;
3370 }
3371
3372 assert(bdrv_get_aio_context(base_bs) == aio_context);
3373
3374 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
3375 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3376 goto out;
3377 }
3378 }
3379
3380 /* Do not allow attempts to commit an image into itself */
3381 if (top_bs == base_bs) {
3382 error_setg(errp, "cannot commit an image into itself");
3383 goto out;
3384 }
3385
3386 if (top_bs == bs) {
3387 if (has_backing_file) {
3388 error_setg(errp, "'backing-file' specified,"
3389 " but 'top' is the active layer");
3390 goto out;
3391 }
3392 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3393 job_flags, speed, on_error,
3394 filter_node_name, NULL, NULL, false, &local_err);
3395 } else {
3396 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
3397 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3398 goto out;
3399 }
3400 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags,
3401 speed, on_error, has_backing_file ? backing_file : NULL,
3402 filter_node_name, &local_err);
3403 }
3404 if (local_err != NULL) {
3405 error_propagate(errp, local_err);
3406 goto out;
3407 }
3408
3409 out:
3410 aio_context_release(aio_context);
3411 }
3412
3413 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
3414 Error **errp)
3415 {
3416 BlockDriverState *bs;
3417 BlockDriverState *target_bs;
3418 BlockDriverState *source = NULL;
3419 BlockJob *job = NULL;
3420 BdrvDirtyBitmap *bmap = NULL;
3421 AioContext *aio_context;
3422 QDict *options = NULL;
3423 Error *local_err = NULL;
3424 int flags, job_flags = JOB_DEFAULT;
3425 int64_t size;
3426 bool set_backing_hd = false;
3427
3428 if (!backup->has_speed) {
3429 backup->speed = 0;
3430 }
3431 if (!backup->has_on_source_error) {
3432 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3433 }
3434 if (!backup->has_on_target_error) {
3435 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3436 }
3437 if (!backup->has_mode) {
3438 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3439 }
3440 if (!backup->has_job_id) {
3441 backup->job_id = NULL;
3442 }
3443 if (!backup->has_auto_finalize) {
3444 backup->auto_finalize = true;
3445 }
3446 if (!backup->has_auto_dismiss) {
3447 backup->auto_dismiss = true;
3448 }
3449 if (!backup->has_compress) {
3450 backup->compress = false;
3451 }
3452
3453 bs = qmp_get_root_bs(backup->device, errp);
3454 if (!bs) {
3455 return NULL;
3456 }
3457
3458 aio_context = bdrv_get_aio_context(bs);
3459 aio_context_acquire(aio_context);
3460
3461 if (!backup->has_format) {
3462 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
3463 NULL : (char*) bs->drv->format_name;
3464 }
3465
3466 /* Early check to avoid creating target */
3467 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3468 goto out;
3469 }
3470
3471 flags = bs->open_flags | BDRV_O_RDWR;
3472
3473 /* See if we have a backing HD we can use to create our new image
3474 * on top of. */
3475 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3476 source = backing_bs(bs);
3477 if (!source) {
3478 backup->sync = MIRROR_SYNC_MODE_FULL;
3479 }
3480 }
3481 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3482 source = bs;
3483 flags |= BDRV_O_NO_BACKING;
3484 set_backing_hd = true;
3485 }
3486
3487 size = bdrv_getlength(bs);
3488 if (size < 0) {
3489 error_setg_errno(errp, -size, "bdrv_getlength failed");