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qapi/events: generate event enum in main module
[qemu.git] / blockdev.c
blob58d757093275cc8879bde0838173ed861256bb83
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/config-file.h"
44 #include "qapi/qapi-commands-block.h"
45 #include "qapi/qapi-commands-transaction.h"
46 #include "qapi/qapi-visit-block-core.h"
47 #include "qapi/qmp/qdict.h"
48 #include "qapi/qmp/qnum.h"
49 #include "qapi/qmp/qstring.h"
50 #include "qapi/error.h"
51 #include "qapi/qmp/qerror.h"
52 #include "qapi/qmp/qlist.h"
53 #include "qapi/qobject-output-visitor.h"
54 #include "sysemu/sysemu.h"
55 #include "sysemu/iothread.h"
56 #include "block/block_int.h"
57 #include "block/trace.h"
58 #include "sysemu/arch_init.h"
59 #include "sysemu/qtest.h"
60 #include "qemu/cutils.h"
61 #include "qemu/help_option.h"
62 #include "qemu/throttle-options.h"
63
64 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
65 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
66
67 static int do_open_tray(const char *blk_name, const char *qdev_id,
68 bool force, Error **errp);
69 static void blockdev_remove_medium(bool has_device, const char *device,
70 bool has_id, const char *id, Error **errp);
71 static void blockdev_insert_medium(bool has_device, const char *device,
72 bool has_id, const char *id,
73 const char *node_name, Error **errp);
74
75 static const char *const if_name[IF_COUNT] = {
76 [IF_NONE] = "none",
77 [IF_IDE] = "ide",
78 [IF_SCSI] = "scsi",
79 [IF_FLOPPY] = "floppy",
80 [IF_PFLASH] = "pflash",
81 [IF_MTD] = "mtd",
82 [IF_SD] = "sd",
83 [IF_VIRTIO] = "virtio",
84 [IF_XEN] = "xen",
85 };
86
87 static int if_max_devs[IF_COUNT] = {
88 /*
89 * Do not change these numbers! They govern how drive option
90 * index maps to unit and bus. That mapping is ABI.
91 *
92 * All controllers used to implement if=T drives need to support
93 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
94 * Otherwise, some index values map to "impossible" bus, unit
95 * values.
96 *
97 * For instance, if you change [IF_SCSI] to 255, -drive
98 * if=scsi,index=12 no longer means bus=1,unit=5, but
99 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
100 * the drive can't be set up. Regression.
101 */
102 [IF_IDE] = 2,
103 [IF_SCSI] = 7,
104 };
105
106 /**
107 * Boards may call this to offer board-by-board overrides
108 * of the default, global values.
109 */
110 void override_max_devs(BlockInterfaceType type, int max_devs)
111 {
112 BlockBackend *blk;
113 DriveInfo *dinfo;
114
115 if (max_devs <= 0) {
116 return;
117 }
118
119 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
120 dinfo = blk_legacy_dinfo(blk);
121 if (dinfo->type == type) {
122 fprintf(stderr, "Cannot override units-per-bus property of"
123 " the %s interface, because a drive of that type has"
124 " already been added.\n", if_name[type]);
125 g_assert_not_reached();
126 }
127 }
128
129 if_max_devs[type] = max_devs;
130 }
131
132 /*
133 * We automatically delete the drive when a device using it gets
134 * unplugged. Questionable feature, but we can't just drop it.
135 * Device models call blockdev_mark_auto_del() to schedule the
136 * automatic deletion, and generic qdev code calls blockdev_auto_del()
137 * when deletion is actually safe.
138 */
139 void blockdev_mark_auto_del(BlockBackend *blk)
140 {
141 DriveInfo *dinfo = blk_legacy_dinfo(blk);
142 BlockDriverState *bs = blk_bs(blk);
143 AioContext *aio_context;
144
145 if (!dinfo) {
146 return;
147 }
148
149 if (bs) {
150 aio_context = bdrv_get_aio_context(bs);
151 aio_context_acquire(aio_context);
152
153 if (bs->job) {
154 job_cancel(&bs->job->job, false);
155 }
156
157 aio_context_release(aio_context);
158 }
159
160 dinfo->auto_del = 1;
161 }
162
163 void blockdev_auto_del(BlockBackend *blk)
164 {
165 DriveInfo *dinfo = blk_legacy_dinfo(blk);
166
167 if (dinfo && dinfo->auto_del) {
168 monitor_remove_blk(blk);
169 blk_unref(blk);
170 }
171 }
172
173 /**
174 * Returns the current mapping of how many units per bus
175 * a particular interface can support.
176 *
177 * A positive integer indicates n units per bus.
178 * 0 implies the mapping has not been established.
179 * -1 indicates an invalid BlockInterfaceType was given.
180 */
181 int drive_get_max_devs(BlockInterfaceType type)
182 {
183 if (type >= IF_IDE && type < IF_COUNT) {
184 return if_max_devs[type];
185 }
186
187 return -1;
188 }
189
190 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
191 {
192 int max_devs = if_max_devs[type];
193 return max_devs ? index / max_devs : 0;
194 }
195
196 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
197 {
198 int max_devs = if_max_devs[type];
199 return max_devs ? index % max_devs : index;
200 }
201
202 QemuOpts *drive_def(const char *optstr)
203 {
204 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
205 }
206
207 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
208 const char *optstr)
209 {
210 QemuOpts *opts;
211
212 opts = drive_def(optstr);
213 if (!opts) {
214 return NULL;
215 }
216 if (type != IF_DEFAULT) {
217 qemu_opt_set(opts, "if", if_name[type], &error_abort);
218 }
219 if (index >= 0) {
220 qemu_opt_set_number(opts, "index", index, &error_abort);
221 }
222 if (file)
223 qemu_opt_set(opts, "file", file, &error_abort);
224 return opts;
225 }
226
227 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
228 {
229 BlockBackend *blk;
230 DriveInfo *dinfo;
231
232 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
233 dinfo = blk_legacy_dinfo(blk);
234 if (dinfo && dinfo->type == type
235 && dinfo->bus == bus && dinfo->unit == unit) {
236 return dinfo;
237 }
238 }
239
240 return NULL;
241 }
242
243 void drive_check_orphaned(void)
244 {
245 BlockBackend *blk;
246 DriveInfo *dinfo;
247 Location loc;
248 bool orphans = false;
249
250 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
251 dinfo = blk_legacy_dinfo(blk);
252 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
253 dinfo->type != IF_NONE) {
254 loc_push_none(&loc);
255 qemu_opts_loc_restore(dinfo->opts);
256 error_report("machine type does not support"
257 " if=%s,bus=%d,unit=%d",
258 if_name[dinfo->type], dinfo->bus, dinfo->unit);
259 loc_pop(&loc);
260 orphans = true;
261 }
262 }
263
264 if (orphans) {
265 exit(1);
266 }
267 }
268
269 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
270 {
271 return drive_get(type,
272 drive_index_to_bus_id(type, index),
273 drive_index_to_unit_id(type, index));
274 }
275
276 int drive_get_max_bus(BlockInterfaceType type)
277 {
278 int max_bus;
279 BlockBackend *blk;
280 DriveInfo *dinfo;
281
282 max_bus = -1;
283 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
284 dinfo = blk_legacy_dinfo(blk);
285 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
286 max_bus = dinfo->bus;
287 }
288 }
289 return max_bus;
290 }
291
292 /* Get a block device. This should only be used for single-drive devices
293 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
294 appropriate bus. */
295 DriveInfo *drive_get_next(BlockInterfaceType type)
296 {
297 static int next_block_unit[IF_COUNT];
298
299 return drive_get(type, 0, next_block_unit[type]++);
300 }
301
302 static void bdrv_format_print(void *opaque, const char *name)
303 {
304 error_printf(" %s", name);
305 }
306
307 typedef struct {
308 QEMUBH *bh;
309 BlockDriverState *bs;
310 } BDRVPutRefBH;
311
312 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
313 {
314 if (!strcmp(buf, "ignore")) {
315 return BLOCKDEV_ON_ERROR_IGNORE;
316 } else if (!is_read && !strcmp(buf, "enospc")) {
317 return BLOCKDEV_ON_ERROR_ENOSPC;
318 } else if (!strcmp(buf, "stop")) {
319 return BLOCKDEV_ON_ERROR_STOP;
320 } else if (!strcmp(buf, "report")) {
321 return BLOCKDEV_ON_ERROR_REPORT;
322 } else {
323 error_setg(errp, "'%s' invalid %s error action",
324 buf, is_read ? "read" : "write");
325 return -1;
326 }
327 }
328
329 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
330 Error **errp)
331 {
332 const QListEntry *entry;
333 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
334 switch (qobject_type(entry->value)) {
335
336 case QTYPE_QSTRING: {
337 unsigned long long length;
338 const char *str = qstring_get_str(qobject_to(QString,
339 entry->value));
340 if (parse_uint_full(str, &length, 10) == 0 &&
341 length > 0 && length <= UINT_MAX) {
342 block_acct_add_interval(stats, (unsigned) length);
343 } else {
344 error_setg(errp, "Invalid interval length: %s", str);
345 return false;
346 }
347 break;
348 }
349
350 case QTYPE_QNUM: {
351 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
352
353 if (length > 0 && length <= UINT_MAX) {
354 block_acct_add_interval(stats, (unsigned) length);
355 } else {
356 error_setg(errp, "Invalid interval length: %" PRId64, length);
357 return false;
358 }
359 break;
360 }
361
362 default:
363 error_setg(errp, "The specification of stats-intervals is invalid");
364 return false;
365 }
366 }
367 return true;
368 }
369
370 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
371
372 /* All parameters but @opts are optional and may be set to NULL. */
373 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
374 const char **throttling_group, ThrottleConfig *throttle_cfg,
375 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
376 {
377 Error *local_error = NULL;
378 const char *aio;
379
380 if (bdrv_flags) {
381 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
382 *bdrv_flags |= BDRV_O_COPY_ON_READ;
383 }
384
385 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
386 if (!strcmp(aio, "native")) {
387 *bdrv_flags |= BDRV_O_NATIVE_AIO;
388 } else if (!strcmp(aio, "threads")) {
389 /* this is the default */
390 } else {
391 error_setg(errp, "invalid aio option");
392 return;
393 }
394 }
395 }
396
397 /* disk I/O throttling */
398 if (throttling_group) {
399 *throttling_group = qemu_opt_get(opts, "throttling.group");
400 }
401
402 if (throttle_cfg) {
403 throttle_config_init(throttle_cfg);
404 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
405 qemu_opt_get_number(opts, "throttling.bps-total", 0);
406 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
407 qemu_opt_get_number(opts, "throttling.bps-read", 0);
408 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
409 qemu_opt_get_number(opts, "throttling.bps-write", 0);
410 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
411 qemu_opt_get_number(opts, "throttling.iops-total", 0);
412 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
413 qemu_opt_get_number(opts, "throttling.iops-read", 0);
414 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
415 qemu_opt_get_number(opts, "throttling.iops-write", 0);
416
417 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
418 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
419 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
420 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
421 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
422 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
423 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
424 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
425 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
426 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
427 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
428 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
429
430 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
431 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
432 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
433 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
434 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
435 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
436 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
437 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
438 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
439 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
440 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
441 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
442
443 throttle_cfg->op_size =
444 qemu_opt_get_number(opts, "throttling.iops-size", 0);
445
446 if (!throttle_is_valid(throttle_cfg, errp)) {
447 return;
448 }
449 }
450
451 if (detect_zeroes) {
452 *detect_zeroes =
453 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
454 qemu_opt_get(opts, "detect-zeroes"),
455 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
456 &local_error);
457 if (local_error) {
458 error_propagate(errp, local_error);
459 return;
460 }
461 }
462 }
463
464 /* Takes the ownership of bs_opts */
465 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
466 Error **errp)
467 {
468 const char *buf;
469 int bdrv_flags = 0;
470 int on_read_error, on_write_error;
471 bool account_invalid, account_failed;
472 bool writethrough, read_only;
473 BlockBackend *blk;
474 BlockDriverState *bs;
475 ThrottleConfig cfg;
476 int snapshot = 0;
477 Error *error = NULL;
478 QemuOpts *opts;
479 QDict *interval_dict = NULL;
480 QList *interval_list = NULL;
481 const char *id;
482 BlockdevDetectZeroesOptions detect_zeroes =
483 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
484 const char *throttling_group = NULL;
485
486 /* Check common options by copying from bs_opts to opts, all other options
487 * stay in bs_opts for processing by bdrv_open(). */
488 id = qdict_get_try_str(bs_opts, "id");
489 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
490 if (error) {
491 error_propagate(errp, error);
492 goto err_no_opts;
493 }
494
495 qemu_opts_absorb_qdict(opts, bs_opts, &error);
496 if (error) {
497 error_propagate(errp, error);
498 goto early_err;
499 }
500
501 if (id) {
502 qdict_del(bs_opts, "id");
503 }
504
505 /* extract parameters */
506 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
507
508 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
509 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
510
511 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
512
513 id = qemu_opts_id(opts);
514
515 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
516 qdict_array_split(interval_dict, &interval_list);
517
518 if (qdict_size(interval_dict) != 0) {
519 error_setg(errp, "Invalid option stats-intervals.%s",
520 qdict_first(interval_dict)->key);
521 goto early_err;
522 }
523
524 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
525 &detect_zeroes, &error);
526 if (error) {
527 error_propagate(errp, error);
528 goto early_err;
529 }
530
531 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
532 if (is_help_option(buf)) {
533 error_printf("Supported formats:");
534 bdrv_iterate_format(bdrv_format_print, NULL);
535 error_printf("\n");
536 goto early_err;
537 }
538
539 if (qdict_haskey(bs_opts, "driver")) {
540 error_setg(errp, "Cannot specify both 'driver' and 'format'");
541 goto early_err;
542 }
543 qdict_put_str(bs_opts, "driver", buf);
544 }
545
546 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
547 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
548 on_write_error = parse_block_error_action(buf, 0, &error);
549 if (error) {
550 error_propagate(errp, error);
551 goto early_err;
552 }
553 }
554
555 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
556 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
557 on_read_error = parse_block_error_action(buf, 1, &error);
558 if (error) {
559 error_propagate(errp, error);
560 goto early_err;
561 }
562 }
563
564 if (snapshot) {
565 bdrv_flags |= BDRV_O_SNAPSHOT;
566 }
567
568 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
569
570 /* init */
571 if ((!file || !*file) && !qdict_size(bs_opts)) {
572 BlockBackendRootState *blk_rs;
573
574 blk = blk_new(0, BLK_PERM_ALL);
575 blk_rs = blk_get_root_state(blk);
576 blk_rs->open_flags = bdrv_flags;
577 blk_rs->read_only = read_only;
578 blk_rs->detect_zeroes = detect_zeroes;
579
580 qobject_unref(bs_opts);
581 } else {
582 if (file && !*file) {
583 file = NULL;
584 }
585
586 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
587 * with other callers) rather than what we want as the real defaults.
588 * Apply the defaults here instead. */
589 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
590 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
591 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
592 read_only ? "on" : "off");
593 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
594
595 if (runstate_check(RUN_STATE_INMIGRATE)) {
596 bdrv_flags |= BDRV_O_INACTIVE;
597 }
598
599 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
600 if (!blk) {
601 goto err_no_bs_opts;
602 }
603 bs = blk_bs(blk);
604
605 bs->detect_zeroes = detect_zeroes;
606
607 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
608
609 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
610 blk_unref(blk);
611 blk = NULL;
612 goto err_no_bs_opts;
613 }
614 }
615
616 /* disk I/O throttling */
617 if (throttle_enabled(&cfg)) {
618 if (!throttling_group) {
619 throttling_group = id;
620 }
621 blk_io_limits_enable(blk, throttling_group);
622 blk_set_io_limits(blk, &cfg);
623 }
624
625 blk_set_enable_write_cache(blk, !writethrough);
626 blk_set_on_error(blk, on_read_error, on_write_error);
627
628 if (!monitor_add_blk(blk, id, errp)) {
629 blk_unref(blk);
630 blk = NULL;
631 goto err_no_bs_opts;
632 }
633
634 err_no_bs_opts:
635 qemu_opts_del(opts);
636 qobject_unref(interval_dict);
637 qobject_unref(interval_list);
638 return blk;
639
640 early_err:
641 qemu_opts_del(opts);
642 qobject_unref(interval_dict);
643 qobject_unref(interval_list);
644 err_no_opts:
645 qobject_unref(bs_opts);
646 return NULL;
647 }
648
649 /* Takes the ownership of bs_opts */
650 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
651 {
652 int bdrv_flags = 0;
653
654 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
655 * with other callers) rather than what we want as the real defaults.
656 * Apply the defaults here instead. */
657 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
658 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
659 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
660
661 if (runstate_check(RUN_STATE_INMIGRATE)) {
662 bdrv_flags |= BDRV_O_INACTIVE;
663 }
664
665 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
666 }
667
668 void blockdev_close_all_bdrv_states(void)
669 {
670 BlockDriverState *bs, *next_bs;
671
672 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
673 AioContext *ctx = bdrv_get_aio_context(bs);
674
675 aio_context_acquire(ctx);
676 bdrv_unref(bs);
677 aio_context_release(ctx);
678 }
679 }
680
681 /* Iterates over the list of monitor-owned BlockDriverStates */
682 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
683 {
684 return bs ? QTAILQ_NEXT(bs, monitor_list)
685 : QTAILQ_FIRST(&monitor_bdrv_states);
686 }
687
688 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
689 Error **errp)
690 {
691 const char *value;
692
693 value = qemu_opt_get(opts, from);
694 if (value) {
695 if (qemu_opt_find(opts, to)) {
696 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
697 "same time", to, from);
698 return;
699 }
700 }
701
702 /* rename all items in opts */
703 while ((value = qemu_opt_get(opts, from))) {
704 qemu_opt_set(opts, to, value, &error_abort);
705 qemu_opt_unset(opts, from);
706 }
707 }
708
709 QemuOptsList qemu_legacy_drive_opts = {
710 .name = "drive",
711 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
712 .desc = {
713 {
714 .name = "bus",
715 .type = QEMU_OPT_NUMBER,
716 .help = "bus number",
717 },{
718 .name = "unit",
719 .type = QEMU_OPT_NUMBER,
720 .help = "unit number (i.e. lun for scsi)",
721 },{
722 .name = "index",
723 .type = QEMU_OPT_NUMBER,
724 .help = "index number",
725 },{
726 .name = "media",
727 .type = QEMU_OPT_STRING,
728 .help = "media type (disk, cdrom)",
729 },{
730 .name = "if",
731 .type = QEMU_OPT_STRING,
732 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
733 },{
734 .name = "file",
735 .type = QEMU_OPT_STRING,
736 .help = "file name",
737 },
738
739 /* Options that are passed on, but have special semantics with -drive */
740 {
741 .name = BDRV_OPT_READ_ONLY,
742 .type = QEMU_OPT_BOOL,
743 .help = "open drive file as read-only",
744 },{
745 .name = "rerror",
746 .type = QEMU_OPT_STRING,
747 .help = "read error action",
748 },{
749 .name = "werror",
750 .type = QEMU_OPT_STRING,
751 .help = "write error action",
752 },{
753 .name = "copy-on-read",
754 .type = QEMU_OPT_BOOL,
755 .help = "copy read data from backing file into image file",
756 },
757
758 { /* end of list */ }
759 },
760 };
761
762 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
763 {
764 const char *value;
765 BlockBackend *blk;
766 DriveInfo *dinfo = NULL;
767 QDict *bs_opts;
768 QemuOpts *legacy_opts;
769 DriveMediaType media = MEDIA_DISK;
770 BlockInterfaceType type;
771 int max_devs, bus_id, unit_id, index;
772 const char *werror, *rerror;
773 bool read_only = false;
774 bool copy_on_read;
775 const char *filename;
776 Error *local_err = NULL;
777 int i;
778
779 /* Change legacy command line options into QMP ones */
780 static const struct {
781 const char *from;
782 const char *to;
783 } opt_renames[] = {
784 { "iops", "throttling.iops-total" },
785 { "iops_rd", "throttling.iops-read" },
786 { "iops_wr", "throttling.iops-write" },
787
788 { "bps", "throttling.bps-total" },
789 { "bps_rd", "throttling.bps-read" },
790 { "bps_wr", "throttling.bps-write" },
791
792 { "iops_max", "throttling.iops-total-max" },
793 { "iops_rd_max", "throttling.iops-read-max" },
794 { "iops_wr_max", "throttling.iops-write-max" },
795
796 { "bps_max", "throttling.bps-total-max" },
797 { "bps_rd_max", "throttling.bps-read-max" },
798 { "bps_wr_max", "throttling.bps-write-max" },
799
800 { "iops_size", "throttling.iops-size" },
801
802 { "group", "throttling.group" },
803
804 { "readonly", BDRV_OPT_READ_ONLY },
805 };
806
807 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
808 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
809 &local_err);
810 if (local_err) {
811 error_report_err(local_err);
812 return NULL;
813 }
814 }
815
816 value = qemu_opt_get(all_opts, "cache");
817 if (value) {
818 int flags = 0;
819 bool writethrough;
820
821 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
822 error_report("invalid cache option");
823 return NULL;
824 }
825
826 /* Specific options take precedence */
827 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
828 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
829 !writethrough, &error_abort);
830 }
831 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
832 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
833 !!(flags & BDRV_O_NOCACHE), &error_abort);
834 }
835 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
836 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
837 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
838 }
839 qemu_opt_unset(all_opts, "cache");
840 }
841
842 /* Get a QDict for processing the options */
843 bs_opts = qdict_new();
844 qemu_opts_to_qdict(all_opts, bs_opts);
845
846 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
847 &error_abort);
848 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
849 if (local_err) {
850 error_report_err(local_err);
851 goto fail;
852 }
853
854 /* Media type */
855 value = qemu_opt_get(legacy_opts, "media");
856 if (value) {
857 if (!strcmp(value, "disk")) {
858 media = MEDIA_DISK;
859 } else if (!strcmp(value, "cdrom")) {
860 media = MEDIA_CDROM;
861 read_only = true;
862 } else {
863 error_report("'%s' invalid media", value);
864 goto fail;
865 }
866 }
867
868 /* copy-on-read is disabled with a warning for read-only devices */
869 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
870 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
871
872 if (read_only && copy_on_read) {
873 warn_report("disabling copy-on-read on read-only drive");
874 copy_on_read = false;
875 }
876
877 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
878 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
879
880 /* Controller type */
881 value = qemu_opt_get(legacy_opts, "if");
882 if (value) {
883 for (type = 0;
884 type < IF_COUNT && strcmp(value, if_name[type]);
885 type++) {
886 }
887 if (type == IF_COUNT) {
888 error_report("unsupported bus type '%s'", value);
889 goto fail;
890 }
891 } else {
892 type = block_default_type;
893 }
894
895 /* Device address specified by bus/unit or index.
896 * If none was specified, try to find the first free one. */
897 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
898 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
899 index = qemu_opt_get_number(legacy_opts, "index", -1);
900
901 max_devs = if_max_devs[type];
902
903 if (index != -1) {
904 if (bus_id != 0 || unit_id != -1) {
905 error_report("index cannot be used with bus and unit");
906 goto fail;
907 }
908 bus_id = drive_index_to_bus_id(type, index);
909 unit_id = drive_index_to_unit_id(type, index);
910 }
911
912 if (unit_id == -1) {
913 unit_id = 0;
914 while (drive_get(type, bus_id, unit_id) != NULL) {
915 unit_id++;
916 if (max_devs && unit_id >= max_devs) {
917 unit_id -= max_devs;
918 bus_id++;
919 }
920 }
921 }
922
923 if (max_devs && unit_id >= max_devs) {
924 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
925 goto fail;
926 }
927
928 if (drive_get(type, bus_id, unit_id) != NULL) {
929 error_report("drive with bus=%d, unit=%d (index=%d) exists",
930 bus_id, unit_id, index);
931 goto fail;
932 }
933
934 /* no id supplied -> create one */
935 if (qemu_opts_id(all_opts) == NULL) {
936 char *new_id;
937 const char *mediastr = "";
938 if (type == IF_IDE || type == IF_SCSI) {
939 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
940 }
941 if (max_devs) {
942 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
943 mediastr, unit_id);
944 } else {
945 new_id = g_strdup_printf("%s%s%i", if_name[type],
946 mediastr, unit_id);
947 }
948 qdict_put_str(bs_opts, "id", new_id);
949 g_free(new_id);
950 }
951
952 /* Add virtio block device */
953 if (type == IF_VIRTIO) {
954 QemuOpts *devopts;
955 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
956 &error_abort);
957 if (arch_type == QEMU_ARCH_S390X) {
958 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
959 } else {
960 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
961 }
962 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
963 &error_abort);
964 }
965
966 filename = qemu_opt_get(legacy_opts, "file");
967
968 /* Check werror/rerror compatibility with if=... */
969 werror = qemu_opt_get(legacy_opts, "werror");
970 if (werror != NULL) {
971 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
972 type != IF_NONE) {
973 error_report("werror is not supported by this bus type");
974 goto fail;
975 }
976 qdict_put_str(bs_opts, "werror", werror);
977 }
978
979 rerror = qemu_opt_get(legacy_opts, "rerror");
980 if (rerror != NULL) {
981 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
982 type != IF_NONE) {
983 error_report("rerror is not supported by this bus type");
984 goto fail;
985 }
986 qdict_put_str(bs_opts, "rerror", rerror);
987 }
988
989 /* Actual block device init: Functionality shared with blockdev-add */
990 blk = blockdev_init(filename, bs_opts, &local_err);
991 bs_opts = NULL;
992 if (!blk) {
993 if (local_err) {
994 error_report_err(local_err);
995 }
996 goto fail;
997 } else {
998 assert(!local_err);
999 }
1000
1001 /* Create legacy DriveInfo */
1002 dinfo = g_malloc0(sizeof(*dinfo));
1003 dinfo->opts = all_opts;
1004
1005 dinfo->type = type;
1006 dinfo->bus = bus_id;
1007 dinfo->unit = unit_id;
1008
1009 blk_set_legacy_dinfo(blk, dinfo);
1010
1011 switch(type) {
1012 case IF_IDE:
1013 case IF_SCSI:
1014 case IF_XEN:
1015 case IF_NONE:
1016 dinfo->media_cd = media == MEDIA_CDROM;
1017 break;
1018 default:
1019 break;
1020 }
1021
1022 fail:
1023 qemu_opts_del(legacy_opts);
1024 qobject_unref(bs_opts);
1025 return dinfo;
1026 }
1027
1028 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1029 {
1030 BlockDriverState *bs;
1031
1032 bs = bdrv_lookup_bs(name, name, errp);
1033 if (bs == NULL) {
1034 return NULL;
1035 }
1036
1037 if (!bdrv_is_root_node(bs)) {
1038 error_setg(errp, "Need a root block node");
1039 return NULL;
1040 }
1041
1042 if (!bdrv_is_inserted(bs)) {
1043 error_setg(errp, "Device has no medium");
1044 return NULL;
1045 }
1046
1047 return bs;
1048 }
1049
1050 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id,
1051 Error **errp)
1052 {
1053 BlockBackend *blk;
1054
1055 if (!blk_name == !qdev_id) {
1056 error_setg(errp, "Need exactly one of 'device' and 'id'");
1057 return NULL;
1058 }
1059
1060 if (qdev_id) {
1061 blk = blk_by_qdev_id(qdev_id, errp);
1062 } else {
1063 blk = blk_by_name(blk_name);
1064 if (blk == NULL) {
1065 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1066 "Device '%s' not found", blk_name);
1067 }
1068 }
1069
1070 return blk;
1071 }
1072
1073 void hmp_commit(Monitor *mon, const QDict *qdict)
1074 {
1075 const char *device = qdict_get_str(qdict, "device");
1076 BlockBackend *blk;
1077 int ret;
1078
1079 if (!strcmp(device, "all")) {
1080 ret = blk_commit_all();
1081 } else {
1082 BlockDriverState *bs;
1083 AioContext *aio_context;
1084
1085 blk = blk_by_name(device);
1086 if (!blk) {
1087 monitor_printf(mon, "Device '%s' not found\n", device);
1088 return;
1089 }
1090 if (!blk_is_available(blk)) {
1091 monitor_printf(mon, "Device '%s' has no medium\n", device);
1092 return;
1093 }
1094
1095 bs = blk_bs(blk);
1096 aio_context = bdrv_get_aio_context(bs);
1097 aio_context_acquire(aio_context);
1098
1099 ret = bdrv_commit(bs);
1100
1101 aio_context_release(aio_context);
1102 }
1103 if (ret < 0) {
1104 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1105 strerror(-ret));
1106 }
1107 }
1108
1109 static void blockdev_do_action(TransactionAction *action, Error **errp)
1110 {
1111 TransactionActionList list;
1112
1113 list.value = action;
1114 list.next = NULL;
1115 qmp_transaction(&list, false, NULL, errp);
1116 }
1117
1118 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1119 bool has_node_name, const char *node_name,
1120 const char *snapshot_file,
1121 bool has_snapshot_node_name,
1122 const char *snapshot_node_name,
1123 bool has_format, const char *format,
1124 bool has_mode, NewImageMode mode, Error **errp)
1125 {
1126 BlockdevSnapshotSync snapshot = {
1127 .has_device = has_device,
1128 .device = (char *) device,
1129 .has_node_name = has_node_name,
1130 .node_name = (char *) node_name,
1131 .snapshot_file = (char *) snapshot_file,
1132 .has_snapshot_node_name = has_snapshot_node_name,
1133 .snapshot_node_name = (char *) snapshot_node_name,
1134 .has_format = has_format,
1135 .format = (char *) format,
1136 .has_mode = has_mode,
1137 .mode = mode,
1138 };
1139 TransactionAction action = {
1140 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1141 .u.blockdev_snapshot_sync.data = &snapshot,
1142 };
1143 blockdev_do_action(&action, errp);
1144 }
1145
1146 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1147 Error **errp)
1148 {
1149 BlockdevSnapshot snapshot_data = {
1150 .node = (char *) node,
1151 .overlay = (char *) overlay
1152 };
1153 TransactionAction action = {
1154 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1155 .u.blockdev_snapshot.data = &snapshot_data,
1156 };
1157 blockdev_do_action(&action, errp);
1158 }
1159
1160 void qmp_blockdev_snapshot_internal_sync(const char *device,
1161 const char *name,
1162 Error **errp)
1163 {
1164 BlockdevSnapshotInternal snapshot = {
1165 .device = (char *) device,
1166 .name = (char *) name
1167 };
1168 TransactionAction action = {
1169 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1170 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1171 };
1172 blockdev_do_action(&action, errp);
1173 }
1174
1175 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1176 bool has_id,
1177 const char *id,
1178 bool has_name,
1179 const char *name,
1180 Error **errp)
1181 {
1182 BlockDriverState *bs;
1183 AioContext *aio_context;
1184 QEMUSnapshotInfo sn;
1185 Error *local_err = NULL;
1186 SnapshotInfo *info = NULL;
1187 int ret;
1188
1189 bs = qmp_get_root_bs(device, errp);
1190 if (!bs) {
1191 return NULL;
1192 }
1193 aio_context = bdrv_get_aio_context(bs);
1194 aio_context_acquire(aio_context);
1195
1196 if (!has_id) {
1197 id = NULL;
1198 }
1199
1200 if (!has_name) {
1201 name = NULL;
1202 }
1203
1204 if (!id && !name) {
1205 error_setg(errp, "Name or id must be provided");
1206 goto out_aio_context;
1207 }
1208
1209 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1210 goto out_aio_context;
1211 }
1212
1213 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1214 if (local_err) {
1215 error_propagate(errp, local_err);
1216 goto out_aio_context;
1217 }
1218 if (!ret) {
1219 error_setg(errp,
1220 "Snapshot with id '%s' and name '%s' does not exist on "
1221 "device '%s'",
1222 STR_OR_NULL(id), STR_OR_NULL(name), device);
1223 goto out_aio_context;
1224 }
1225
1226 bdrv_snapshot_delete(bs, id, name, &local_err);
1227 if (local_err) {
1228 error_propagate(errp, local_err);
1229 goto out_aio_context;
1230 }
1231
1232 aio_context_release(aio_context);
1233
1234 info = g_new0(SnapshotInfo, 1);
1235 info->id = g_strdup(sn.id_str);
1236 info->name = g_strdup(sn.name);
1237 info->date_nsec = sn.date_nsec;
1238 info->date_sec = sn.date_sec;
1239 info->vm_state_size = sn.vm_state_size;
1240 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1241 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1242
1243 return info;
1244
1245 out_aio_context:
1246 aio_context_release(aio_context);
1247 return NULL;
1248 }
1249
1250 /**
1251 * block_dirty_bitmap_lookup:
1252 * Return a dirty bitmap (if present), after validating
1253 * the node reference and bitmap names.
1254 *
1255 * @node: The name of the BDS node to search for bitmaps
1256 * @name: The name of the bitmap to search for
1257 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1258 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1259 * @errp: Output pointer for error information. Can be NULL.
1260 *
1261 * @return: A bitmap object on success, or NULL on failure.
1262 */
1263 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1264 const char *name,
1265 BlockDriverState **pbs,
1266 Error **errp)
1267 {
1268 BlockDriverState *bs;
1269 BdrvDirtyBitmap *bitmap;
1270
1271 if (!node) {
1272 error_setg(errp, "Node cannot be NULL");
1273 return NULL;
1274 }
1275 if (!name) {
1276 error_setg(errp, "Bitmap name cannot be NULL");
1277 return NULL;
1278 }
1279 bs = bdrv_lookup_bs(node, node, NULL);
1280 if (!bs) {
1281 error_setg(errp, "Node '%s' not found", node);
1282 return NULL;
1283 }
1284
1285 bitmap = bdrv_find_dirty_bitmap(bs, name);
1286 if (!bitmap) {
1287 error_setg(errp, "Dirty bitmap '%s' not found", name);
1288 return NULL;
1289 }
1290
1291 if (pbs) {
1292 *pbs = bs;
1293 }
1294
1295 return bitmap;
1296 }
1297
1298 /* New and old BlockDriverState structs for atomic group operations */
1299
1300 typedef struct BlkActionState BlkActionState;
1301
1302 /**
1303 * BlkActionOps:
1304 * Table of operations that define an Action.
1305 *
1306 * @instance_size: Size of state struct, in bytes.
1307 * @prepare: Prepare the work, must NOT be NULL.
1308 * @commit: Commit the changes, can be NULL.
1309 * @abort: Abort the changes on fail, can be NULL.
1310 * @clean: Clean up resources after all transaction actions have called
1311 * commit() or abort(). Can be NULL.
1312 *
1313 * Only prepare() may fail. In a single transaction, only one of commit() or
1314 * abort() will be called. clean() will always be called if it is present.
1315 */
1316 typedef struct BlkActionOps {
1317 size_t instance_size;
1318 void (*prepare)(BlkActionState *common, Error **errp);
1319 void (*commit)(BlkActionState *common);
1320 void (*abort)(BlkActionState *common);
1321 void (*clean)(BlkActionState *common);
1322 } BlkActionOps;
1323
1324 /**
1325 * BlkActionState:
1326 * Describes one Action's state within a Transaction.
1327 *
1328 * @action: QAPI-defined enum identifying which Action to perform.
1329 * @ops: Table of ActionOps this Action can perform.
1330 * @block_job_txn: Transaction which this action belongs to.
1331 * @entry: List membership for all Actions in this Transaction.
1332 *
1333 * This structure must be arranged as first member in a subclassed type,
1334 * assuming that the compiler will also arrange it to the same offsets as the
1335 * base class.
1336 */
1337 struct BlkActionState {
1338 TransactionAction *action;
1339 const BlkActionOps *ops;
1340 JobTxn *block_job_txn;
1341 TransactionProperties *txn_props;
1342 QSIMPLEQ_ENTRY(BlkActionState) entry;
1343 };
1344
1345 /* internal snapshot private data */
1346 typedef struct InternalSnapshotState {
1347 BlkActionState common;
1348 BlockDriverState *bs;
1349 QEMUSnapshotInfo sn;
1350 bool created;
1351 } InternalSnapshotState;
1352
1353
1354 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1355 {
1356 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1357 error_setg(errp,
1358 "Action '%s' does not support Transaction property "
1359 "completion-mode = %s",
1360 TransactionActionKind_str(s->action->type),
1361 ActionCompletionMode_str(s->txn_props->completion_mode));
1362 return -1;
1363 }
1364 return 0;
1365 }
1366
1367 static void internal_snapshot_prepare(BlkActionState *common,
1368 Error **errp)
1369 {
1370 Error *local_err = NULL;
1371 const char *device;
1372 const char *name;
1373 BlockDriverState *bs;
1374 QEMUSnapshotInfo old_sn, *sn;
1375 bool ret;
1376 qemu_timeval tv;
1377 BlockdevSnapshotInternal *internal;
1378 InternalSnapshotState *state;
1379 AioContext *aio_context;
1380 int ret1;
1381
1382 g_assert(common->action->type ==
1383 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1384 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1385 state = DO_UPCAST(InternalSnapshotState, common, common);
1386
1387 /* 1. parse input */
1388 device = internal->device;
1389 name = internal->name;
1390
1391 /* 2. check for validation */
1392 if (action_check_completion_mode(common, errp) < 0) {
1393 return;
1394 }
1395
1396 bs = qmp_get_root_bs(device, errp);
1397 if (!bs) {
1398 return;
1399 }
1400
1401 aio_context = bdrv_get_aio_context(bs);
1402 aio_context_acquire(aio_context);
1403
1404 state->bs = bs;
1405
1406 /* Paired with .clean() */
1407 bdrv_drained_begin(bs);
1408
1409 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1410 goto out;
1411 }
1412
1413 if (bdrv_is_read_only(bs)) {
1414 error_setg(errp, "Device '%s' is read only", device);
1415 goto out;
1416 }
1417
1418 if (!bdrv_can_snapshot(bs)) {
1419 error_setg(errp, "Block format '%s' used by device '%s' "
1420 "does not support internal snapshots",
1421 bs->drv->format_name, device);
1422 goto out;
1423 }
1424
1425 if (!strlen(name)) {
1426 error_setg(errp, "Name is empty");
1427 goto out;
1428 }
1429
1430 /* check whether a snapshot with name exist */
1431 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1432 &local_err);
1433 if (local_err) {
1434 error_propagate(errp, local_err);
1435 goto out;
1436 } else if (ret) {
1437 error_setg(errp,
1438 "Snapshot with name '%s' already exists on device '%s'",
1439 name, device);
1440 goto out;
1441 }
1442
1443 /* 3. take the snapshot */
1444 sn = &state->sn;
1445 pstrcpy(sn->name, sizeof(sn->name), name);
1446 qemu_gettimeofday(&tv);
1447 sn->date_sec = tv.tv_sec;
1448 sn->date_nsec = tv.tv_usec * 1000;
1449 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1450
1451 ret1 = bdrv_snapshot_create(bs, sn);
1452 if (ret1 < 0) {
1453 error_setg_errno(errp, -ret1,
1454 "Failed to create snapshot '%s' on device '%s'",
1455 name, device);
1456 goto out;
1457 }
1458
1459 /* 4. succeed, mark a snapshot is created */
1460 state->created = true;
1461
1462 out:
1463 aio_context_release(aio_context);
1464 }
1465
1466 static void internal_snapshot_abort(BlkActionState *common)
1467 {
1468 InternalSnapshotState *state =
1469 DO_UPCAST(InternalSnapshotState, common, common);
1470 BlockDriverState *bs = state->bs;
1471 QEMUSnapshotInfo *sn = &state->sn;
1472 AioContext *aio_context;
1473 Error *local_error = NULL;
1474
1475 if (!state->created) {
1476 return;
1477 }
1478
1479 aio_context = bdrv_get_aio_context(state->bs);
1480 aio_context_acquire(aio_context);
1481
1482 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1483 error_reportf_err(local_error,
1484 "Failed to delete snapshot with id '%s' and "
1485 "name '%s' on device '%s' in abort: ",
1486 sn->id_str, sn->name,
1487 bdrv_get_device_name(bs));
1488 }
1489
1490 aio_context_release(aio_context);
1491 }
1492
1493 static void internal_snapshot_clean(BlkActionState *common)
1494 {
1495 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1496 common, common);
1497 AioContext *aio_context;
1498
1499 if (!state->bs) {
1500 return;
1501 }
1502
1503 aio_context = bdrv_get_aio_context(state->bs);
1504 aio_context_acquire(aio_context);
1505
1506 bdrv_drained_end(state->bs);
1507
1508 aio_context_release(aio_context);
1509 }
1510
1511 /* external snapshot private data */
1512 typedef struct ExternalSnapshotState {
1513 BlkActionState common;
1514 BlockDriverState *old_bs;
1515 BlockDriverState *new_bs;
1516 bool overlay_appended;
1517 } ExternalSnapshotState;
1518
1519 static void external_snapshot_prepare(BlkActionState *common,
1520 Error **errp)
1521 {
1522 int flags = 0;
1523 QDict *options = NULL;
1524 Error *local_err = NULL;
1525 /* Device and node name of the image to generate the snapshot from */
1526 const char *device;
1527 const char *node_name;
1528 /* Reference to the new image (for 'blockdev-snapshot') */
1529 const char *snapshot_ref;
1530 /* File name of the new image (for 'blockdev-snapshot-sync') */
1531 const char *new_image_file;
1532 ExternalSnapshotState *state =
1533 DO_UPCAST(ExternalSnapshotState, common, common);
1534 TransactionAction *action = common->action;
1535 AioContext *aio_context;
1536
1537 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1538 * purpose but a different set of parameters */
1539 switch (action->type) {
1540 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1541 {
1542 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1543 device = s->node;
1544 node_name = s->node;
1545 new_image_file = NULL;
1546 snapshot_ref = s->overlay;
1547 }
1548 break;
1549 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1550 {
1551 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1552 device = s->has_device ? s->device : NULL;
1553 node_name = s->has_node_name ? s->node_name : NULL;
1554 new_image_file = s->snapshot_file;
1555 snapshot_ref = NULL;
1556 }
1557 break;
1558 default:
1559 g_assert_not_reached();
1560 }
1561
1562 /* start processing */
1563 if (action_check_completion_mode(common, errp) < 0) {
1564 return;
1565 }
1566
1567 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1568 if (!state->old_bs) {
1569 return;
1570 }
1571
1572 aio_context = bdrv_get_aio_context(state->old_bs);
1573 aio_context_acquire(aio_context);
1574
1575 /* Paired with .clean() */
1576 bdrv_drained_begin(state->old_bs);
1577
1578 if (!bdrv_is_inserted(state->old_bs)) {
1579 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1580 goto out;
1581 }
1582
1583 if (bdrv_op_is_blocked(state->old_bs,
1584 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1585 goto out;
1586 }
1587
1588 if (!bdrv_is_read_only(state->old_bs)) {
1589 if (bdrv_flush(state->old_bs)) {
1590 error_setg(errp, QERR_IO_ERROR);
1591 goto out;
1592 }
1593 }
1594
1595 if (!bdrv_is_first_non_filter(state->old_bs)) {
1596 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1597 goto out;
1598 }
1599
1600 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1601 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1602 const char *format = s->has_format ? s->format : "qcow2";
1603 enum NewImageMode mode;
1604 const char *snapshot_node_name =
1605 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1606
1607 if (node_name && !snapshot_node_name) {
1608 error_setg(errp, "New snapshot node name missing");
1609 goto out;
1610 }
1611
1612 if (snapshot_node_name &&
1613 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1614 error_setg(errp, "New snapshot node name already in use");
1615 goto out;
1616 }
1617
1618 flags = state->old_bs->open_flags;
1619 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1620 flags |= BDRV_O_NO_BACKING;
1621
1622 /* create new image w/backing file */
1623 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1624 if (mode != NEW_IMAGE_MODE_EXISTING) {
1625 int64_t size = bdrv_getlength(state->old_bs);
1626 if (size < 0) {
1627 error_setg_errno(errp, -size, "bdrv_getlength failed");
1628 goto out;
1629 }
1630 bdrv_img_create(new_image_file, format,
1631 state->old_bs->filename,
1632 state->old_bs->drv->format_name,
1633 NULL, size, flags, false, &local_err);
1634 if (local_err) {
1635 error_propagate(errp, local_err);
1636 goto out;
1637 }
1638 }
1639
1640 options = qdict_new();
1641 if (s->has_snapshot_node_name) {
1642 qdict_put_str(options, "node-name", snapshot_node_name);
1643 }
1644 qdict_put_str(options, "driver", format);
1645 }
1646
1647 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1648 errp);
1649 /* We will manually add the backing_hd field to the bs later */
1650 if (!state->new_bs) {
1651 goto out;
1652 }
1653
1654 if (bdrv_has_blk(state->new_bs)) {
1655 error_setg(errp, "The snapshot is already in use");
1656 goto out;
1657 }
1658
1659 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1660 errp)) {
1661 goto out;
1662 }
1663
1664 if (state->new_bs->backing != NULL) {
1665 error_setg(errp, "The snapshot already has a backing image");
1666 goto out;
1667 }
1668
1669 if (!state->new_bs->drv->supports_backing) {
1670 error_setg(errp, "The snapshot does not support backing images");
1671 goto out;
1672 }
1673
1674 bdrv_set_aio_context(state->new_bs, aio_context);
1675
1676 /* This removes our old bs and adds the new bs. This is an operation that
1677 * can fail, so we need to do it in .prepare; undoing it for abort is
1678 * always possible. */
1679 bdrv_ref(state->new_bs);
1680 bdrv_append(state->new_bs, state->old_bs, &local_err);
1681 if (local_err) {
1682 error_propagate(errp, local_err);
1683 goto out;
1684 }
1685 state->overlay_appended = true;
1686
1687 out:
1688 aio_context_release(aio_context);
1689 }
1690
1691 static void external_snapshot_commit(BlkActionState *common)
1692 {
1693 ExternalSnapshotState *state =
1694 DO_UPCAST(ExternalSnapshotState, common, common);
1695 AioContext *aio_context;
1696
1697 aio_context = bdrv_get_aio_context(state->old_bs);
1698 aio_context_acquire(aio_context);
1699
1700 /* We don't need (or want) to use the transactional
1701 * bdrv_reopen_multiple() across all the entries at once, because we
1702 * don't want to abort all of them if one of them fails the reopen */
1703 if (!atomic_read(&state->old_bs->copy_on_read)) {
1704 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1705 NULL);
1706 }
1707
1708 aio_context_release(aio_context);
1709 }
1710
1711 static void external_snapshot_abort(BlkActionState *common)
1712 {
1713 ExternalSnapshotState *state =
1714 DO_UPCAST(ExternalSnapshotState, common, common);
1715 if (state->new_bs) {
1716 if (state->overlay_appended) {
1717 AioContext *aio_context;
1718
1719 aio_context = bdrv_get_aio_context(state->old_bs);
1720 aio_context_acquire(aio_context);
1721
1722 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1723 close state->old_bs; we need it */
1724 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1725 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1726 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1727
1728 aio_context_release(aio_context);
1729 }
1730 }
1731 }
1732
1733 static void external_snapshot_clean(BlkActionState *common)
1734 {
1735 ExternalSnapshotState *state =
1736 DO_UPCAST(ExternalSnapshotState, common, common);
1737 AioContext *aio_context;
1738
1739 if (!state->old_bs) {
1740 return;
1741 }
1742
1743 aio_context = bdrv_get_aio_context(state->old_bs);
1744 aio_context_acquire(aio_context);
1745
1746 bdrv_drained_end(state->old_bs);
1747 bdrv_unref(state->new_bs);
1748
1749 aio_context_release(aio_context);
1750 }
1751
1752 typedef struct DriveBackupState {
1753 BlkActionState common;
1754 BlockDriverState *bs;
1755 BlockJob *job;
1756 } DriveBackupState;
1757
1758 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
1759 Error **errp);
1760
1761 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1762 {
1763 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1764 BlockDriverState *bs;
1765 DriveBackup *backup;
1766 AioContext *aio_context;
1767 Error *local_err = NULL;
1768
1769 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1770 backup = common->action->u.drive_backup.data;
1771
1772 bs = qmp_get_root_bs(backup->device, errp);
1773 if (!bs) {
1774 return;
1775 }
1776
1777 aio_context = bdrv_get_aio_context(bs);
1778 aio_context_acquire(aio_context);
1779
1780 /* Paired with .clean() */
1781 bdrv_drained_begin(bs);
1782
1783 state->bs = bs;
1784
1785 state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
1786 if (local_err) {
1787 error_propagate(errp, local_err);
1788 goto out;
1789 }
1790
1791 out:
1792 aio_context_release(aio_context);
1793 }
1794
1795 static void drive_backup_commit(BlkActionState *common)
1796 {
1797 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1798 AioContext *aio_context;
1799
1800 aio_context = bdrv_get_aio_context(state->bs);
1801 aio_context_acquire(aio_context);
1802
1803 assert(state->job);
1804 job_start(&state->job->job);
1805
1806 aio_context_release(aio_context);
1807 }
1808
1809 static void drive_backup_abort(BlkActionState *common)
1810 {
1811 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1812
1813 if (state->job) {
1814 AioContext *aio_context;
1815
1816 aio_context = bdrv_get_aio_context(state->bs);
1817 aio_context_acquire(aio_context);
1818
1819 job_cancel_sync(&state->job->job);
1820
1821 aio_context_release(aio_context);
1822 }
1823 }
1824
1825 static void drive_backup_clean(BlkActionState *common)
1826 {
1827 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1828 AioContext *aio_context;
1829
1830 if (!state->bs) {
1831 return;
1832 }
1833
1834 aio_context = bdrv_get_aio_context(state->bs);
1835 aio_context_acquire(aio_context);
1836
1837 bdrv_drained_end(state->bs);
1838
1839 aio_context_release(aio_context);
1840 }
1841
1842 typedef struct BlockdevBackupState {
1843 BlkActionState common;
1844 BlockDriverState *bs;
1845 BlockJob *job;
1846 } BlockdevBackupState;
1847
1848 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
1849 Error **errp);
1850
1851 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1852 {
1853 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1854 BlockdevBackup *backup;
1855 BlockDriverState *bs, *target;
1856 AioContext *aio_context;
1857 Error *local_err = NULL;
1858
1859 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1860 backup = common->action->u.blockdev_backup.data;
1861
1862 bs = qmp_get_root_bs(backup->device, errp);
1863 if (!bs) {
1864 return;
1865 }
1866
1867 target = bdrv_lookup_bs(backup->target, backup->target, errp);
1868 if (!target) {
1869 return;
1870 }
1871
1872 aio_context = bdrv_get_aio_context(bs);
1873 if (aio_context != bdrv_get_aio_context(target)) {
1874 error_setg(errp, "Backup between two IO threads is not implemented");
1875 return;
1876 }
1877 aio_context_acquire(aio_context);
1878 state->bs = bs;
1879
1880 /* Paired with .clean() */
1881 bdrv_drained_begin(state->bs);
1882
1883 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
1884 if (local_err) {
1885 error_propagate(errp, local_err);
1886 goto out;
1887 }
1888
1889 out:
1890 aio_context_release(aio_context);
1891 }
1892
1893 static void blockdev_backup_commit(BlkActionState *common)
1894 {
1895 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1896 AioContext *aio_context;
1897
1898 aio_context = bdrv_get_aio_context(state->bs);
1899 aio_context_acquire(aio_context);
1900
1901 assert(state->job);
1902 job_start(&state->job->job);
1903
1904 aio_context_release(aio_context);
1905 }
1906
1907 static void blockdev_backup_abort(BlkActionState *common)
1908 {
1909 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1910
1911 if (state->job) {
1912 AioContext *aio_context;
1913
1914 aio_context = bdrv_get_aio_context(state->bs);
1915 aio_context_acquire(aio_context);
1916
1917 job_cancel_sync(&state->job->job);
1918
1919 aio_context_release(aio_context);
1920 }
1921 }
1922
1923 static void blockdev_backup_clean(BlkActionState *common)
1924 {
1925 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1926 AioContext *aio_context;
1927
1928 if (!state->bs) {
1929 return;
1930 }
1931
1932 aio_context = bdrv_get_aio_context(state->bs);
1933 aio_context_acquire(aio_context);
1934
1935 bdrv_drained_end(state->bs);
1936
1937 aio_context_release(aio_context);
1938 }
1939
1940 typedef struct BlockDirtyBitmapState {
1941 BlkActionState common;
1942 BdrvDirtyBitmap *bitmap;
1943 BlockDriverState *bs;
1944 HBitmap *backup;
1945 bool prepared;
1946 bool was_enabled;
1947 } BlockDirtyBitmapState;
1948
1949 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
1950 Error **errp)
1951 {
1952 Error *local_err = NULL;
1953 BlockDirtyBitmapAdd *action;
1954 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1955 common, common);
1956
1957 if (action_check_completion_mode(common, errp) < 0) {
1958 return;
1959 }
1960
1961 action = common->action->u.block_dirty_bitmap_add.data;
1962 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1963 qmp_block_dirty_bitmap_add(action->node, action->name,
1964 action->has_granularity, action->granularity,
1965 action->has_persistent, action->persistent,
1966 action->has_autoload, action->autoload,
1967 action->has_x_disabled, action->x_disabled,
1968 &local_err);
1969
1970 if (!local_err) {
1971 state->prepared = true;
1972 } else {
1973 error_propagate(errp, local_err);
1974 }
1975 }
1976
1977 static void block_dirty_bitmap_add_abort(BlkActionState *common)
1978 {
1979 BlockDirtyBitmapAdd *action;
1980 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1981 common, common);
1982
1983 action = common->action->u.block_dirty_bitmap_add.data;
1984 /* Should not be able to fail: IF the bitmap was added via .prepare(),
1985 * then the node reference and bitmap name must have been valid.
1986 */
1987 if (state->prepared) {
1988 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
1989 }
1990 }
1991
1992 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
1993 Error **errp)
1994 {
1995 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1996 common, common);
1997 BlockDirtyBitmap *action;
1998
1999 if (action_check_completion_mode(common, errp) < 0) {
2000 return;
2001 }
2002
2003 action = common->action->u.block_dirty_bitmap_clear.data;
2004 state->bitmap = block_dirty_bitmap_lookup(action->node,
2005 action->name,
2006 &state->bs,
2007 errp);
2008 if (!state->bitmap) {
2009 return;
2010 }
2011
2012 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2013 error_setg(errp, "Cannot modify a frozen bitmap");
2014 return;
2015 } else if (bdrv_dirty_bitmap_qmp_locked(state->bitmap)) {
2016 error_setg(errp, "Cannot modify a locked bitmap");
2017 return;
2018 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2019 error_setg(errp, "Cannot clear a disabled bitmap");
2020 return;
2021 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
2022 error_setg(errp, "Cannot clear a readonly bitmap");
2023 return;
2024 }
2025
2026 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2027 }
2028
2029 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2030 {
2031 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2032 common, common);
2033
2034 if (state->backup) {
2035 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2036 }
2037 }
2038
2039 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2040 {
2041 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2042 common, common);
2043
2044 hbitmap_free(state->backup);
2045 }
2046
2047 static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
2048 Error **errp)
2049 {
2050 BlockDirtyBitmap *action;
2051 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2052 common, common);
2053
2054 if (action_check_completion_mode(common, errp) < 0) {
2055 return;
2056 }
2057
2058 action = common->action->u.x_block_dirty_bitmap_enable.data;
2059 state->bitmap = block_dirty_bitmap_lookup(action->node,
2060 action->name,
2061 NULL,
2062 errp);
2063 if (!state->bitmap) {
2064 return;
2065 }
2066
2067 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2068 bdrv_enable_dirty_bitmap(state->bitmap);
2069 }
2070
2071 static void block_dirty_bitmap_enable_abort(BlkActionState *common)
2072 {
2073 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2074 common, common);
2075
2076 if (!state->was_enabled) {
2077 bdrv_disable_dirty_bitmap(state->bitmap);
2078 }
2079 }
2080
2081 static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
2082 Error **errp)
2083 {
2084 BlockDirtyBitmap *action;
2085 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2086 common, common);
2087
2088 if (action_check_completion_mode(common, errp) < 0) {
2089 return;
2090 }
2091
2092 action = common->action->u.x_block_dirty_bitmap_disable.data;
2093 state->bitmap = block_dirty_bitmap_lookup(action->node,
2094 action->name,
2095 NULL,
2096 errp);
2097 if (!state->bitmap) {
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 void abort_prepare(BlkActionState *common, Error **errp)
2116 {
2117 error_setg(errp, "Transaction aborted using Abort action");
2118 }
2119
2120 static void abort_commit(BlkActionState *common)
2121 {
2122 g_assert_not_reached(); /* this action never succeeds */
2123 }
2124
2125 static const BlkActionOps actions[] = {
2126 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2127 .instance_size = sizeof(ExternalSnapshotState),
2128 .prepare = external_snapshot_prepare,
2129 .commit = external_snapshot_commit,
2130 .abort = external_snapshot_abort,
2131 .clean = external_snapshot_clean,
2132 },
2133 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2134 .instance_size = sizeof(ExternalSnapshotState),
2135 .prepare = external_snapshot_prepare,
2136 .commit = external_snapshot_commit,
2137 .abort = external_snapshot_abort,
2138 .clean = external_snapshot_clean,
2139 },
2140 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2141 .instance_size = sizeof(DriveBackupState),
2142 .prepare = drive_backup_prepare,
2143 .commit = drive_backup_commit,
2144 .abort = drive_backup_abort,
2145 .clean = drive_backup_clean,
2146 },
2147 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2148 .instance_size = sizeof(BlockdevBackupState),
2149 .prepare = blockdev_backup_prepare,
2150 .commit = blockdev_backup_commit,
2151 .abort = blockdev_backup_abort,
2152 .clean = blockdev_backup_clean,
2153 },
2154 [TRANSACTION_ACTION_KIND_ABORT] = {
2155 .instance_size = sizeof(BlkActionState),
2156 .prepare = abort_prepare,
2157 .commit = abort_commit,
2158 },
2159 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2160 .instance_size = sizeof(InternalSnapshotState),
2161 .prepare = internal_snapshot_prepare,
2162 .abort = internal_snapshot_abort,
2163 .clean = internal_snapshot_clean,
2164 },
2165 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2166 .instance_size = sizeof(BlockDirtyBitmapState),
2167 .prepare = block_dirty_bitmap_add_prepare,
2168 .abort = block_dirty_bitmap_add_abort,
2169 },
2170 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2171 .instance_size = sizeof(BlockDirtyBitmapState),
2172 .prepare = block_dirty_bitmap_clear_prepare,
2173 .commit = block_dirty_bitmap_clear_commit,
2174 .abort = block_dirty_bitmap_clear_abort,
2175 },
2176 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_ENABLE] = {
2177 .instance_size = sizeof(BlockDirtyBitmapState),
2178 .prepare = block_dirty_bitmap_enable_prepare,
2179 .abort = block_dirty_bitmap_enable_abort,
2180 },
2181 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_DISABLE] = {
2182 .instance_size = sizeof(BlockDirtyBitmapState),
2183 .prepare = block_dirty_bitmap_disable_prepare,
2184 .abort = block_dirty_bitmap_disable_abort,
2185 }
2186 };
2187
2188 /**
2189 * Allocate a TransactionProperties structure if necessary, and fill
2190 * that structure with desired defaults if they are unset.
2191 */
2192 static TransactionProperties *get_transaction_properties(
2193 TransactionProperties *props)
2194 {
2195 if (!props) {
2196 props = g_new0(TransactionProperties, 1);
2197 }
2198
2199 if (!props->has_completion_mode) {
2200 props->has_completion_mode = true;
2201 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2202 }
2203
2204 return props;
2205 }
2206
2207 /*
2208 * 'Atomic' group operations. The operations are performed as a set, and if
2209 * any fail then we roll back all operations in the group.
2210 */
2211 void qmp_transaction(TransactionActionList *dev_list,
2212 bool has_props,
2213 struct TransactionProperties *props,
2214 Error **errp)
2215 {
2216 TransactionActionList *dev_entry = dev_list;
2217 JobTxn *block_job_txn = NULL;
2218 BlkActionState *state, *next;
2219 Error *local_err = NULL;
2220
2221 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2222 QSIMPLEQ_INIT(&snap_bdrv_states);
2223
2224 /* Does this transaction get canceled as a group on failure?
2225 * If not, we don't really need to make a JobTxn.
2226 */
2227 props = get_transaction_properties(props);
2228 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2229 block_job_txn = job_txn_new();
2230 }
2231
2232 /* drain all i/o before any operations */
2233 bdrv_drain_all();
2234
2235 /* We don't do anything in this loop that commits us to the operations */
2236 while (NULL != dev_entry) {
2237 TransactionAction *dev_info = NULL;
2238 const BlkActionOps *ops;
2239
2240 dev_info = dev_entry->value;
2241 dev_entry = dev_entry->next;
2242
2243 assert(dev_info->type < ARRAY_SIZE(actions));
2244
2245 ops = &actions[dev_info->type];
2246 assert(ops->instance_size > 0);
2247
2248 state = g_malloc0(ops->instance_size);
2249 state->ops = ops;
2250 state->action = dev_info;
2251 state->block_job_txn = block_job_txn;
2252 state->txn_props = props;
2253 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2254
2255 state->ops->prepare(state, &local_err);
2256 if (local_err) {
2257 error_propagate(errp, local_err);
2258 goto delete_and_fail;
2259 }
2260 }
2261
2262 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2263 if (state->ops->commit) {
2264 state->ops->commit(state);
2265 }
2266 }
2267
2268 /* success */
2269 goto exit;
2270
2271 delete_and_fail:
2272 /* failure, and it is all-or-none; roll back all operations */
2273 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2274 if (state->ops->abort) {
2275 state->ops->abort(state);
2276 }
2277 }
2278 exit:
2279 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2280 if (state->ops->clean) {
2281 state->ops->clean(state);
2282 }
2283 g_free(state);
2284 }
2285 if (!has_props) {
2286 qapi_free_TransactionProperties(props);
2287 }
2288 job_txn_unref(block_job_txn);
2289 }
2290
2291 void qmp_eject(bool has_device, const char *device,
2292 bool has_id, const char *id,
2293 bool has_force, bool force, Error **errp)
2294 {
2295 Error *local_err = NULL;
2296 int rc;
2297
2298 if (!has_force) {
2299 force = false;
2300 }
2301
2302 rc = do_open_tray(has_device ? device : NULL,
2303 has_id ? id : NULL,
2304 force, &local_err);
2305 if (rc && rc != -ENOSYS) {
2306 error_propagate(errp, local_err);
2307 return;
2308 }
2309 error_free(local_err);
2310
2311 blockdev_remove_medium(has_device, device, has_id, id, errp);
2312 }
2313
2314 void qmp_block_passwd(bool has_device, const char *device,
2315 bool has_node_name, const char *node_name,
2316 const char *password, Error **errp)
2317 {
2318 error_setg(errp,
2319 "Setting block passwords directly is no longer supported");
2320 }
2321
2322 /*
2323 * Attempt to open the tray of @device.
2324 * If @force, ignore its tray lock.
2325 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2326 * On error, store an error through @errp and return -errno.
2327 * If @device does not exist, return -ENODEV.
2328 * If it has no removable media, return -ENOTSUP.
2329 * If it has no tray, return -ENOSYS.
2330 * If the guest was asked to open the tray, return -EINPROGRESS.
2331 * Else, return 0.
2332 */
2333 static int do_open_tray(const char *blk_name, const char *qdev_id,
2334 bool force, Error **errp)
2335 {
2336 BlockBackend *blk;
2337 const char *device = qdev_id ?: blk_name;
2338 bool locked;
2339
2340 blk = qmp_get_blk(blk_name, qdev_id, errp);
2341 if (!blk) {
2342 return -ENODEV;
2343 }
2344
2345 if (!blk_dev_has_removable_media(blk)) {
2346 error_setg(errp, "Device '%s' is not removable", device);
2347 return -ENOTSUP;
2348 }
2349
2350 if (!blk_dev_has_tray(blk)) {
2351 error_setg(errp, "Device '%s' does not have a tray", device);
2352 return -ENOSYS;
2353 }
2354
2355 if (blk_dev_is_tray_open(blk)) {
2356 return 0;
2357 }
2358
2359 locked = blk_dev_is_medium_locked(blk);
2360 if (locked) {
2361 blk_dev_eject_request(blk, force);
2362 }
2363
2364 if (!locked || force) {
2365 blk_dev_change_media_cb(blk, false, &error_abort);
2366 }
2367
2368 if (locked && !force) {
2369 error_setg(errp, "Device '%s' is locked and force was not specified, "
2370 "wait for tray to open and try again", device);
2371 return -EINPROGRESS;
2372 }
2373
2374 return 0;
2375 }
2376
2377 void qmp_blockdev_open_tray(bool has_device, const char *device,
2378 bool has_id, const char *id,
2379 bool has_force, bool force,
2380 Error **errp)
2381 {
2382 Error *local_err = NULL;
2383 int rc;
2384
2385 if (!has_force) {
2386 force = false;
2387 }
2388 rc = do_open_tray(has_device ? device : NULL,
2389 has_id ? id : NULL,
2390 force, &local_err);
2391 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
2392 error_propagate(errp, local_err);
2393 return;
2394 }
2395 error_free(local_err);
2396 }
2397
2398 void qmp_blockdev_close_tray(bool has_device, const char *device,
2399 bool has_id, const char *id,
2400 Error **errp)
2401 {
2402 BlockBackend *blk;
2403 Error *local_err = NULL;
2404
2405 device = has_device ? device : NULL;
2406 id = has_id ? id : NULL;
2407
2408 blk = qmp_get_blk(device, id, errp);
2409 if (!blk) {
2410 return;
2411 }
2412
2413 if (!blk_dev_has_removable_media(blk)) {
2414 error_setg(errp, "Device '%s' is not removable", device ?: id);
2415 return;
2416 }
2417
2418 if (!blk_dev_has_tray(blk)) {
2419 /* Ignore this command on tray-less devices */
2420 return;
2421 }
2422
2423 if (!blk_dev_is_tray_open(blk)) {
2424 return;
2425 }
2426
2427 blk_dev_change_media_cb(blk, true, &local_err);
2428 if (local_err) {
2429 error_propagate(errp, local_err);
2430 return;
2431 }
2432 }
2433
2434 static void blockdev_remove_medium(bool has_device, const char *device,
2435 bool has_id, const char *id, Error **errp)
2436 {
2437 BlockBackend *blk;
2438 BlockDriverState *bs;
2439 AioContext *aio_context;
2440 bool has_attached_device;
2441
2442 device = has_device ? device : NULL;
2443 id = has_id ? id : NULL;
2444
2445 blk = qmp_get_blk(device, id, errp);
2446 if (!blk) {
2447 return;
2448 }
2449
2450 /* For BBs without a device, we can exchange the BDS tree at will */
2451 has_attached_device = blk_get_attached_dev(blk);
2452
2453 if (has_attached_device && !blk_dev_has_removable_media(blk)) {
2454 error_setg(errp, "Device '%s' is not removable", device ?: id);
2455 return;
2456 }
2457
2458 if (has_attached_device && blk_dev_has_tray(blk) &&
2459 !blk_dev_is_tray_open(blk))
2460 {
2461 error_setg(errp, "Tray of device '%s' is not open", device ?: id);
2462 return;
2463 }
2464
2465 bs = blk_bs(blk);
2466 if (!bs) {
2467 return;
2468 }
2469
2470 aio_context = bdrv_get_aio_context(bs);
2471 aio_context_acquire(aio_context);
2472
2473 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2474 goto out;
2475 }
2476
2477 blk_remove_bs(blk);
2478
2479 if (!blk_dev_has_tray(blk)) {
2480 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2481 * called at all); therefore, the medium needs to be ejected here.
2482 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2483 * value passed here (i.e. false). */
2484 blk_dev_change_media_cb(blk, false, &error_abort);
2485 }
2486
2487 out:
2488 aio_context_release(aio_context);
2489 }
2490
2491 void qmp_blockdev_remove_medium(const char *id, Error **errp)
2492 {
2493 blockdev_remove_medium(false, NULL, true, id, errp);
2494 }
2495
2496 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2497 BlockDriverState *bs, Error **errp)
2498 {
2499 Error *local_err = NULL;
2500 bool has_device;
2501 int ret;
2502
2503 /* For BBs without a device, we can exchange the BDS tree at will */
2504 has_device = blk_get_attached_dev(blk);
2505
2506 if (has_device && !blk_dev_has_removable_media(blk)) {
2507 error_setg(errp, "Device is not removable");
2508 return;
2509 }
2510
2511 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2512 error_setg(errp, "Tray of the device is not open");
2513 return;
2514 }
2515
2516 if (blk_bs(blk)) {
2517 error_setg(errp, "There already is a medium in the device");
2518 return;
2519 }
2520
2521 ret = blk_insert_bs(blk, bs, errp);
2522 if (ret < 0) {
2523 return;
2524 }
2525
2526 if (!blk_dev_has_tray(blk)) {
2527 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2528 * called at all); therefore, the medium needs to be pushed into the
2529 * slot here.
2530 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2531 * value passed here (i.e. true). */
2532 blk_dev_change_media_cb(blk, true, &local_err);
2533 if (local_err) {
2534 error_propagate(errp, local_err);
2535 blk_remove_bs(blk);
2536 return;
2537 }
2538 }
2539 }
2540
2541 static void blockdev_insert_medium(bool has_device, const char *device,
2542 bool has_id, const char *id,
2543 const char *node_name, Error **errp)
2544 {
2545 BlockBackend *blk;
2546 BlockDriverState *bs;
2547
2548 blk = qmp_get_blk(has_device ? device : NULL,
2549 has_id ? id : NULL,
2550 errp);
2551 if (!blk) {
2552 return;
2553 }
2554
2555 bs = bdrv_find_node(node_name);
2556 if (!bs) {
2557 error_setg(errp, "Node '%s' not found", node_name);
2558 return;
2559 }
2560
2561 if (bdrv_has_blk(bs)) {
2562 error_setg(errp, "Node '%s' is already in use", node_name);
2563 return;
2564 }
2565
2566 qmp_blockdev_insert_anon_medium(blk, bs, errp);
2567 }
2568
2569 void qmp_blockdev_insert_medium(const char *id, const char *node_name,
2570 Error **errp)
2571 {
2572 blockdev_insert_medium(false, NULL, true, id, node_name, errp);
2573 }
2574
2575 void qmp_blockdev_change_medium(bool has_device, const char *device,
2576 bool has_id, const char *id,
2577 const char *filename,
2578 bool has_format, const char *format,
2579 bool has_read_only,
2580 BlockdevChangeReadOnlyMode read_only,
2581 Error **errp)
2582 {
2583 BlockBackend *blk;
2584 BlockDriverState *medium_bs = NULL;
2585 int bdrv_flags;
2586 bool detect_zeroes;
2587 int rc;
2588 QDict *options = NULL;
2589 Error *err = NULL;
2590
2591 blk = qmp_get_blk(has_device ? device : NULL,
2592 has_id ? id : NULL,
2593 errp);
2594 if (!blk) {
2595 goto fail;
2596 }
2597
2598 if (blk_bs(blk)) {
2599 blk_update_root_state(blk);
2600 }
2601
2602 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2603 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2604 BDRV_O_PROTOCOL);
2605
2606 if (!has_read_only) {
2607 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2608 }
2609
2610 switch (read_only) {
2611 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2612 break;
2613
2614 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2615 bdrv_flags &= ~BDRV_O_RDWR;
2616 break;
2617
2618 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2619 bdrv_flags |= BDRV_O_RDWR;
2620 break;
2621
2622 default:
2623 abort();
2624 }
2625
2626 options = qdict_new();
2627 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2628 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
2629
2630 if (has_format) {
2631 qdict_put_str(options, "driver", format);
2632 }
2633
2634 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
2635 if (!medium_bs) {
2636 goto fail;
2637 }
2638
2639 rc = do_open_tray(has_device ? device : NULL,
2640 has_id ? id : NULL,
2641 false, &err);
2642 if (rc && rc != -ENOSYS) {
2643 error_propagate(errp, err);
2644 goto fail;
2645 }
2646 error_free(err);
2647 err = NULL;
2648
2649 blockdev_remove_medium(has_device, device, has_id, id, &err);
2650 if (err) {
2651 error_propagate(errp, err);
2652 goto fail;
2653 }
2654
2655 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2656 if (err) {
2657 error_propagate(errp, err);
2658 goto fail;
2659 }
2660
2661 qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2662
2663 fail:
2664 /* If the medium has been inserted, the device has its own reference, so
2665 * ours must be relinquished; and if it has not been inserted successfully,
2666 * the reference must be relinquished anyway */
2667 bdrv_unref(medium_bs);
2668 }
2669
2670 /* throttling disk I/O limits */
2671 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2672 {
2673 ThrottleConfig cfg;
2674 BlockDriverState *bs;
2675 BlockBackend *blk;
2676 AioContext *aio_context;
2677
2678 blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
2679 arg->has_id ? arg->id : NULL,
2680 errp);
2681 if (!blk) {
2682 return;
2683 }
2684
2685 aio_context = blk_get_aio_context(blk);
2686 aio_context_acquire(aio_context);
2687
2688 bs = blk_bs(blk);
2689 if (!bs) {
2690 error_setg(errp, "Device has no medium");
2691 goto out;
2692 }
2693
2694 throttle_config_init(&cfg);
2695 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
2696 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd;
2697 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
2698
2699 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
2700 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd;
2701 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
2702
2703 if (arg->has_bps_max) {
2704 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2705 }
2706 if (arg->has_bps_rd_max) {
2707 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2708 }
2709 if (arg->has_bps_wr_max) {
2710 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2711 }
2712 if (arg->has_iops_max) {
2713 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2714 }
2715 if (arg->has_iops_rd_max) {
2716 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2717 }
2718 if (arg->has_iops_wr_max) {
2719 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2720 }
2721
2722 if (arg->has_bps_max_length) {
2723 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2724 }
2725 if (arg->has_bps_rd_max_length) {
2726 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2727 }
2728 if (arg->has_bps_wr_max_length) {
2729 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2730 }
2731 if (arg->has_iops_max_length) {
2732 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2733 }
2734 if (arg->has_iops_rd_max_length) {
2735 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2736 }
2737 if (arg->has_iops_wr_max_length) {
2738 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2739 }
2740
2741 if (arg->has_iops_size) {
2742 cfg.op_size = arg->iops_size;
2743 }
2744
2745 if (!throttle_is_valid(&cfg, errp)) {
2746 goto out;
2747 }
2748
2749 if (throttle_enabled(&cfg)) {
2750 /* Enable I/O limits if they're not enabled yet, otherwise
2751 * just update the throttling group. */
2752 if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
2753 blk_io_limits_enable(blk,
2754 arg->has_group ? arg->group :
2755 arg->has_device ? arg->device :
2756 arg->id);
2757 } else if (arg->has_group) {
2758 blk_io_limits_update_group(blk, arg->group);
2759 }
2760 /* Set the new throttling configuration */
2761 blk_set_io_limits(blk, &cfg);
2762 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
2763 /* If all throttling settings are set to 0, disable I/O limits */
2764 blk_io_limits_disable(blk);
2765 }
2766
2767 out:
2768 aio_context_release(aio_context);
2769 }
2770
2771 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2772 bool has_granularity, uint32_t granularity,
2773 bool has_persistent, bool persistent,
2774 bool has_autoload, bool autoload,
2775 bool has_disabled, bool disabled,
2776 Error **errp)
2777 {
2778 BlockDriverState *bs;
2779 BdrvDirtyBitmap *bitmap;
2780
2781 if (!name || name[0] == '\0') {
2782 error_setg(errp, "Bitmap name cannot be empty");
2783 return;
2784 }
2785
2786 bs = bdrv_lookup_bs(node, node, errp);
2787 if (!bs) {
2788 return;
2789 }
2790
2791 if (has_granularity) {
2792 if (granularity < 512 || !is_power_of_2(granularity)) {
2793 error_setg(errp, "Granularity must be power of 2 "
2794 "and at least 512");
2795 return;
2796 }
2797 } else {
2798 /* Default to cluster size, if available: */
2799 granularity = bdrv_get_default_bitmap_granularity(bs);
2800 }
2801
2802 if (!has_persistent) {
2803 persistent = false;
2804 }
2805
2806 if (has_autoload) {
2807 warn_report("Autoload option is deprecated and its value is ignored");
2808 }
2809
2810 if (!has_disabled) {
2811 disabled = false;
2812 }
2813
2814 if (persistent &&
2815 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
2816 {
2817 return;
2818 }
2819
2820 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2821 if (bitmap == NULL) {
2822 return;
2823 }
2824
2825 if (disabled) {
2826 bdrv_disable_dirty_bitmap(bitmap);
2827 }
2828
2829 bdrv_dirty_bitmap_set_persistance(bitmap, persistent);
2830 }
2831
2832 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2833 Error **errp)
2834 {
2835 BlockDriverState *bs;
2836 BdrvDirtyBitmap *bitmap;
2837 Error *local_err = NULL;
2838
2839 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2840 if (!bitmap || !bs) {
2841 return;
2842 }
2843
2844 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2845 error_setg(errp,
2846 "Bitmap '%s' is currently frozen and cannot be removed",
2847 name);
2848 return;
2849 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
2850 error_setg(errp,
2851 "Bitmap '%s' is currently locked and cannot be removed",
2852 name);
2853 return;
2854 }
2855
2856 if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
2857 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
2858 if (local_err != NULL) {
2859 error_propagate(errp, local_err);
2860 return;
2861 }
2862 }
2863
2864 bdrv_release_dirty_bitmap(bs, bitmap);
2865 }
2866
2867 /**
2868 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2869 * immediately after a full backup operation.
2870 */
2871 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2872 Error **errp)
2873 {
2874 BdrvDirtyBitmap *bitmap;
2875 BlockDriverState *bs;
2876
2877 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2878 if (!bitmap || !bs) {
2879 return;
2880 }
2881
2882 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2883 error_setg(errp,
2884 "Bitmap '%s' is currently frozen and cannot be modified",
2885 name);
2886 return;
2887 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
2888 error_setg(errp,
2889 "Bitmap '%s' is currently locked and cannot be modified",
2890 name);
2891 return;
2892 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2893 error_setg(errp,
2894 "Bitmap '%s' is currently disabled and cannot be cleared",
2895 name);
2896 return;
2897 } else if (bdrv_dirty_bitmap_readonly(bitmap)) {
2898 error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name);
2899 return;
2900 }
2901
2902 bdrv_clear_dirty_bitmap(bitmap, NULL);
2903 }
2904
2905 void qmp_x_block_dirty_bitmap_enable(const char *node, const char *name,
2906 Error **errp)
2907 {
2908 BlockDriverState *bs;
2909 BdrvDirtyBitmap *bitmap;
2910
2911 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2912 if (!bitmap) {
2913 return;
2914 }
2915
2916 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2917 error_setg(errp,
2918 "Bitmap '%s' is currently frozen and cannot be enabled",
2919 name);
2920 return;
2921 }
2922
2923 bdrv_enable_dirty_bitmap(bitmap);
2924 }
2925
2926 void qmp_x_block_dirty_bitmap_disable(const char *node, const char *name,
2927 Error **errp)
2928 {
2929 BlockDriverState *bs;
2930 BdrvDirtyBitmap *bitmap;
2931
2932 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2933 if (!bitmap) {
2934 return;
2935 }
2936
2937 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2938 error_setg(errp,
2939 "Bitmap '%s' is currently frozen and cannot be disabled",
2940 name);
2941 return;
2942 }
2943
2944 bdrv_disable_dirty_bitmap(bitmap);
2945 }
2946
2947 void qmp_x_block_dirty_bitmap_merge(const char *node, const char *dst_name,
2948 const char *src_name, Error **errp)
2949 {
2950 BlockDriverState *bs;
2951 BdrvDirtyBitmap *dst, *src;
2952
2953 dst = block_dirty_bitmap_lookup(node, dst_name, &bs, errp);
2954 if (!dst) {
2955 return;
2956 }
2957
2958 if (bdrv_dirty_bitmap_frozen(dst)) {
2959 error_setg(errp, "Bitmap '%s' is frozen and cannot be modified",
2960 dst_name);
2961 return;
2962 } else if (bdrv_dirty_bitmap_readonly(dst)) {
2963 error_setg(errp, "Bitmap '%s' is readonly and cannot be modified",
2964 dst_name);
2965 return;
2966 }
2967
2968 src = bdrv_find_dirty_bitmap(bs, src_name);
2969 if (!src) {
2970 error_setg(errp, "Dirty bitmap '%s' not found", src_name);
2971 return;
2972 }
2973
2974 bdrv_merge_dirty_bitmap(dst, src, errp);
2975 }
2976
2977 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2978 const char *name,
2979 Error **errp)
2980 {
2981 BdrvDirtyBitmap *bitmap;
2982 BlockDriverState *bs;
2983 BlockDirtyBitmapSha256 *ret = NULL;
2984 char *sha256;
2985
2986 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2987 if (!bitmap || !bs) {
2988 return NULL;
2989 }
2990
2991 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2992 if (sha256 == NULL) {
2993 return NULL;
2994 }
2995
2996 ret = g_new(BlockDirtyBitmapSha256, 1);
2997 ret->sha256 = sha256;
2998
2999 return ret;
3000 }
3001
3002 void hmp_drive_del(Monitor *mon, const QDict *qdict)
3003 {
3004 const char *id = qdict_get_str(qdict, "id");
3005 BlockBackend *blk;
3006 BlockDriverState *bs;
3007 AioContext *aio_context;
3008 Error *local_err = NULL;
3009
3010 bs = bdrv_find_node(id);
3011 if (bs) {
3012 qmp_blockdev_del(id, &local_err);
3013 if (local_err) {
3014 error_report_err(local_err);
3015 }
3016 return;
3017 }
3018
3019 blk = blk_by_name(id);
3020 if (!blk) {
3021 error_report("Device '%s' not found", id);
3022 return;
3023 }
3024
3025 if (!blk_legacy_dinfo(blk)) {
3026 error_report("Deleting device added with blockdev-add"
3027 " is not supported");
3028 return;
3029 }
3030
3031 aio_context = blk_get_aio_context(blk);
3032 aio_context_acquire(aio_context);
3033
3034 bs = blk_bs(blk);
3035 if (bs) {
3036 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
3037 error_report_err(local_err);
3038 aio_context_release(aio_context);
3039 return;
3040 }
3041
3042 blk_remove_bs(blk);
3043 }
3044
3045 /* Make the BlockBackend and the attached BlockDriverState anonymous */
3046 monitor_remove_blk(blk);
3047
3048 /* If this BlockBackend has a device attached to it, its refcount will be
3049 * decremented when the device is removed; otherwise we have to do so here.
3050 */
3051 if (blk_get_attached_dev(blk)) {
3052 /* Further I/O must not pause the guest */
3053 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
3054 BLOCKDEV_ON_ERROR_REPORT);
3055 } else {
3056 blk_unref(blk);
3057 }
3058
3059 aio_context_release(aio_context);
3060 }
3061
3062 void qmp_block_resize(bool has_device, const char *device,
3063 bool has_node_name, const char *node_name,
3064 int64_t size, Error **errp)
3065 {
3066 Error *local_err = NULL;
3067 BlockBackend *blk = NULL;
3068 BlockDriverState *bs;
3069 AioContext *aio_context;
3070 int ret;
3071
3072 bs = bdrv_lookup_bs(has_device ? device : NULL,
3073 has_node_name ? node_name : NULL,
3074 &local_err);
3075 if (local_err) {
3076 error_propagate(errp, local_err);
3077 return;
3078 }
3079
3080 aio_context = bdrv_get_aio_context(bs);
3081 aio_context_acquire(aio_context);
3082
3083 if (!bdrv_is_first_non_filter(bs)) {
3084 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
3085 goto out;
3086 }
3087
3088 if (size < 0) {
3089 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
3090 goto out;
3091 }
3092
3093 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
3094 error_setg(errp, QERR_DEVICE_IN_USE, device);
3095 goto out;
3096 }
3097
3098 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
3099 ret = blk_insert_bs(blk, bs, errp);
3100 if (ret < 0) {
3101 goto out;
3102 }
3103
3104 bdrv_drained_begin(bs);
3105 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
3106 bdrv_drained_end(bs);
3107
3108 out:
3109 blk_unref(blk);
3110 aio_context_release(aio_context);
3111 }
3112
3113 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
3114 bool has_base, const char *base,
3115 bool has_base_node, const char *base_node,
3116 bool has_backing_file, const char *backing_file,
3117 bool has_speed, int64_t speed,
3118 bool has_on_error, BlockdevOnError on_error,
3119 Error **errp)
3120 {
3121 BlockDriverState *bs, *iter;
3122 BlockDriverState *base_bs = NULL;
3123 AioContext *aio_context;
3124 Error *local_err = NULL;
3125 const char *base_name = NULL;
3126
3127 if (!has_on_error) {
3128 on_error = BLOCKDEV_ON_ERROR_REPORT;
3129 }
3130
3131 bs = bdrv_lookup_bs(device, device, errp);
3132 if (!bs) {
3133 return;
3134 }
3135
3136 aio_context = bdrv_get_aio_context(bs);
3137 aio_context_acquire(aio_context);
3138
3139 if (has_base && has_base_node) {
3140 error_setg(errp, "'base' and 'base-node' cannot be specified "
3141 "at the same time");
3142 goto out;
3143 }
3144
3145 if (has_base) {
3146 base_bs = bdrv_find_backing_image(bs, base);
3147 if (base_bs == NULL) {
3148 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3149 goto out;
3150 }
3151 assert(bdrv_get_aio_context(base_bs) == aio_context);
3152 base_name = base;
3153 }
3154
3155 if (has_base_node) {
3156 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3157 if (!base_bs) {
3158 goto out;
3159 }
3160 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
3161 error_setg(errp, "Node '%s' is not a backing image of '%s'",
3162 base_node, device);
3163 goto out;
3164 }
3165 assert(bdrv_get_aio_context(base_bs) == aio_context);
3166 base_name = base_bs->filename;
3167 }
3168
3169 /* Check for op blockers in the whole chain between bs and base */
3170 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
3171 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
3172 goto out;
3173 }
3174 }
3175
3176 /* if we are streaming the entire chain, the result will have no backing
3177 * file, and specifying one is therefore an error */
3178 if (base_bs == NULL && has_backing_file) {
3179 error_setg(errp, "backing file specified, but streaming the "
3180 "entire chain");
3181 goto out;
3182 }
3183
3184 /* backing_file string overrides base bs filename */
3185 base_name = has_backing_file ? backing_file : base_name;
3186
3187 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
3188 has_speed ? speed : 0, on_error, &local_err);
3189 if (local_err) {
3190 error_propagate(errp, local_err);
3191 goto out;
3192 }
3193
3194 trace_qmp_block_stream(bs, bs->job);
3195
3196 out:
3197 aio_context_release(aio_context);
3198 }
3199
3200 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3201 bool has_base, const char *base,
3202 bool has_top, const char *top,
3203 bool has_backing_file, const char *backing_file,
3204 bool has_speed, int64_t speed,
3205 bool has_filter_node_name, const char *filter_node_name,
3206 Error **errp)
3207 {
3208 BlockDriverState *bs;
3209 BlockDriverState *iter;
3210 BlockDriverState *base_bs, *top_bs;
3211 AioContext *aio_context;
3212 Error *local_err = NULL;
3213 /* This will be part of the QMP command, if/when the
3214 * BlockdevOnError change for blkmirror makes it in
3215 */
3216 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3217
3218 if (!has_speed) {
3219 speed = 0;
3220 }
3221 if (!has_filter_node_name) {
3222 filter_node_name = NULL;
3223 }
3224
3225 /* Important Note:
3226 * libvirt relies on the DeviceNotFound error class in order to probe for
3227 * live commit feature versions; for this to work, we must make sure to
3228 * perform the device lookup before any generic errors that may occur in a
3229 * scenario in which all optional arguments are omitted. */
3230 bs = qmp_get_root_bs(device, &local_err);
3231 if (!bs) {
3232 bs = bdrv_lookup_bs(device, device, NULL);
3233 if (!bs) {
3234 error_free(local_err);
3235 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3236 "Device '%s' not found", device);
3237 } else {
3238 error_propagate(errp, local_err);
3239 }
3240 return;
3241 }
3242
3243 aio_context = bdrv_get_aio_context(bs);
3244 aio_context_acquire(aio_context);
3245
3246 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3247 goto out;
3248 }
3249
3250 /* default top_bs is the active layer */
3251 top_bs = bs;
3252
3253 if (has_top && top) {
3254 if (strcmp(bs->filename, top) != 0) {
3255 top_bs = bdrv_find_backing_image(bs, top);
3256 }
3257 }
3258
3259 if (top_bs == NULL) {
3260 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3261 goto out;
3262 }
3263
3264 assert(bdrv_get_aio_context(top_bs) == aio_context);
3265
3266 if (has_base && base) {
3267 base_bs = bdrv_find_backing_image(top_bs, base);
3268 } else {
3269 base_bs = bdrv_find_base(top_bs);
3270 }
3271
3272 if (base_bs == NULL) {
3273 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3274 goto out;
3275 }
3276
3277 assert(bdrv_get_aio_context(base_bs) == aio_context);
3278
3279 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
3280 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3281 goto out;
3282 }
3283 }
3284
3285 /* Do not allow attempts to commit an image into itself */
3286 if (top_bs == base_bs) {
3287 error_setg(errp, "cannot commit an image into itself");
3288 goto out;
3289 }
3290
3291 if (top_bs == bs) {
3292 if (has_backing_file) {
3293 error_setg(errp, "'backing-file' specified,"
3294 " but 'top' is the active layer");
3295 goto out;
3296 }
3297 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3298 JOB_DEFAULT, speed, on_error,
3299 filter_node_name, NULL, NULL, false, &local_err);
3300 } else {
3301 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
3302 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3303 goto out;
3304 }
3305 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed,
3306 on_error, has_backing_file ? backing_file : NULL,
3307 filter_node_name, &local_err);
3308 }
3309 if (local_err != NULL) {
3310 error_propagate(errp, local_err);
3311 goto out;
3312 }
3313
3314 out:
3315 aio_context_release(aio_context);
3316 }
3317
3318 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
3319 Error **errp)
3320 {
3321 BlockDriverState *bs;
3322 BlockDriverState *target_bs;
3323 BlockDriverState *source = NULL;
3324 BlockJob *job = NULL;
3325 BdrvDirtyBitmap *bmap = NULL;
3326 AioContext *aio_context;
3327 QDict *options = NULL;
3328 Error *local_err = NULL;
3329 int flags, job_flags = JOB_DEFAULT;
3330 int64_t size;
3331 bool set_backing_hd = false;
3332
3333 if (!backup->has_speed) {
3334 backup->speed = 0;
3335 }
3336 if (!backup->has_on_source_error) {
3337 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3338 }
3339 if (!backup->has_on_target_error) {
3340 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3341 }
3342 if (!backup->has_mode) {
3343 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3344 }
3345 if (!backup->has_job_id) {
3346 backup->job_id = NULL;
3347 }
3348 if (!backup->has_auto_finalize) {
3349 backup->auto_finalize = true;
3350 }
3351 if (!backup->has_auto_dismiss) {
3352 backup->auto_dismiss = true;
3353 }
3354 if (!backup->has_compress) {
3355 backup->compress = false;
3356 }
3357
3358 bs = qmp_get_root_bs(backup->device, errp);
3359 if (!bs) {
3360 return NULL;
3361 }
3362
3363 aio_context = bdrv_get_aio_context(bs);
3364 aio_context_acquire(aio_context);
3365
3366 if (!backup->has_format) {
3367 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
3368 NULL : (char*) bs->drv->format_name;
3369 }
3370
3371 /* Early check to avoid creating target */
3372 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3373 goto out;
3374 }
3375
3376 flags = bs->open_flags | BDRV_O_RDWR;
3377
3378 /* See if we have a backing HD we can use to create our new image
3379 * on top of. */
3380 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3381 source = backing_bs(bs);
3382 if (!source) {
3383 backup->sync = MIRROR_SYNC_MODE_FULL;
3384 }
3385 }
3386 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3387 source = bs;
3388 flags |= BDRV_O_NO_BACKING;
3389 set_backing_hd = true;
3390 }
3391
3392 size = bdrv_getlength(bs);
3393 if (size < 0) {
3394 error_setg_errno(errp, -size, "bdrv_getlength failed");
3395 goto out;
3396 }
3397
3398 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
3399 assert(backup->format);
3400 if (source) {
3401 bdrv_img_create(backup->target, backup->format, source->filename,
3402 source->drv->format_name, NULL,
3403 size, flags, false, &local_err);
3404 } else {
3405 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
3406 size, flags, false, &local_err);
3407 }
3408 }
3409
3410 if (local_err) {
3411 error_propagate(errp, local_err);
3412 goto out;
3413 }
3414
3415 if (backup->format) {
3416 if (!options) {
3417 options = qdict_new();
3418 }
3419 qdict_put_str(options, "driver", backup->format);
3420 }
3421
3422 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
3423 if (!target_bs) {
3424 goto out;
3425 }
3426
3427 bdrv_set_aio_context(target_bs, aio_context);
3428
3429 if (set_backing_hd) {
3430 bdrv_set_backing_hd(target_bs, source, &local_err);
3431 if (local_err) {
3432 bdrv_unref(target_bs);
3433 goto out;
3434 }
3435 }
3436
3437 if (backup->has_bitmap) {
3438 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3439 if (!bmap) {
3440 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3441 bdrv_unref(target_bs);
3442 goto out;
3443 }
3444 if (bdrv_dirty_bitmap_qmp_locked(bmap)) {
3445 error_setg(errp,
3446 "Bitmap '%s' is currently locked and cannot be used for "
3447 "backup", backup->bitmap);
3448 goto out;
3449 }
3450 }
3451 if (!backup->auto_finalize) {
3452 job_flags |= JOB_MANUAL_FINALIZE;
3453 }
3454 if (!backup->auto_dismiss) {
3455 job_flags |= JOB_MANUAL_DISMISS;
3456 }
3457
3458 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3459 backup->sync, bmap, backup->compress,
3460 backup->on_source_error, backup->on_target_error,
3461 job_flags, NULL, NULL, txn, &local_err);
3462 bdrv_unref(target_bs);
3463 if (local_err != NULL) {
3464 error_propagate(errp, local_err);
3465 goto out;
3466 }
3467
3468 out:
3469 aio_context_release(aio_context);
3470 return job;
3471 }
3472
3473 void qmp_drive_backup(DriveBackup *arg, Error **errp)
3474 {
3475
3476 BlockJob *job;
3477 job = do_drive_backup(arg, NULL, errp);
3478 if (job) {
3479 job_start(&job->job);
3480 }
3481 }
3482
3483 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3484 {
3485 return bdrv_named_nodes_list(errp);
3486 }
3487
3488 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
3489 Error **errp)
3490 {
3491 BlockDriverState *bs;
3492 BlockDriverState *target_bs;
3493 Error *local_err = NULL;
3494 AioContext *aio_context;
3495 BlockJob *job = NULL;
3496 int job_flags = JOB_DEFAULT;
3497
3498 if (!backup->has_speed) {
3499 backup->speed = 0;
3500 }
3501 if (!backup->has_on_source_error) {
3502 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3503 }
3504 if (!backup->has_on_target_error) {
3505 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3506 }
3507 if (!backup->has_job_id) {
3508 backup->job_id = NULL;
3509 }
3510 if (!backup->has_auto_finalize) {
3511 backup->auto_finalize = true;
3512 }
3513 if (!backup->has_auto_dismiss) {
3514 backup->auto_dismiss = true;
3515 }
3516 if (!backup->has_compress) {
3517 backup->compress = false;
3518 }
3519
3520 bs = qmp_get_root_bs(backup->device, errp);
3521 if (!bs) {
3522 return NULL;
3523 }
3524
3525 aio_context = bdrv_get_aio_context(bs);
3526 aio_context_acquire(aio_context);
3527
3528 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
3529 if (!target_bs) {
3530 goto out;
3531 }
3532
3533 if (bdrv_get_aio_context(target_bs) != aio_context) {
3534 if (!bdrv_has_blk(target_bs)) {
3535 /* The target BDS is not attached, we can safely move it to another
3536 * AioContext. */
3537 bdrv_set_aio_context(target_bs, aio_context);
3538 } else {
3539 error_setg(errp, "Target is attached to a different thread from "
3540 "source.");
3541 goto out;
3542 }
3543 }
3544 if (!backup->auto_finalize) {
3545 job_flags |= JOB_MANUAL_FINALIZE;
3546 }
3547 if (!backup->auto_dismiss) {
3548 job_flags |= JOB_MANUAL_DISMISS;
3549 }
3550 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3551 backup->sync, NULL, backup->compress,
3552 backup->on_source_error, backup->on_target_error,
3553 job_flags, NULL, NULL, txn, &local_err);
3554 if (local_err != NULL) {
3555 error_propagate(errp, local_err);
3556 }
3557 out:
3558 aio_context_release(aio_context);
3559 return job;
3560 }
3561
3562 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
3563 {
3564 BlockJob *job;
3565 job = do_blockdev_backup(arg, NULL, errp);
3566 if (job) {
3567 job_start(&job->job);
3568 }
3569 }
3570
3571 /* Parameter check and block job starting for drive mirroring.
3572 * Caller should hold @device and @target's aio context (must be the same).
3573 **/
3574 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3575 BlockDriverState *target,
3576 bool has_replaces, const char *replaces,
3577 enum MirrorSyncMode sync,
3578 BlockMirrorBackingMode backing_mode,
3579 bool has_speed, int64_t speed,
3580 bool has_granularity, uint32_t granularity,
3581 bool has_buf_size, int64_t buf_size,
3582 bool has_on_source_error,
3583 BlockdevOnError on_source_error,
3584 bool has_on_target_error,
3585 BlockdevOnError on_target_error,
3586 bool has_unmap, bool unmap,
3587 bool has_filter_node_name,
3588 const char *filter_node_name,
3589 bool has_copy_mode, MirrorCopyMode copy_mode,
3590 Error **errp)
3591 {
3592
3593 if (!has_speed) {
3594 speed = 0;
3595 }
3596 if (!has_on_source_error) {
3597 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3598 }
3599 if (!has_on_target_error) {
3600 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3601 }
3602 if (!has_granularity) {
3603 granularity = 0;
3604 }
3605 if (!has_buf_size) {
3606 buf_size = 0;
3607 }
3608 if (!has_unmap) {
3609 unmap = true;
3610 }
3611 if (!has_filter_node_name) {
3612 filter_node_name = NULL;
3613 }
3614 if (!has_copy_mode) {
3615 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
3616 }
3617
3618 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3619 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3620 "a value in range [512B, 64MB]");
3621 return;
3622 }
3623 if (granularity & (granularity - 1)) {
3624 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3625 "power of 2");
3626 return;
3627 }
3628
3629 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3630 return;
3631 }
3632 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3633 return;
3634 }
3635
3636 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3637 sync = MIRROR_SYNC_MODE_FULL;
3638 }
3639
3640 /* pass the node name to replace to mirror start since it's loose coupling
3641 * and will allow to check whether the node still exist at mirror completion
3642 */
3643 mirror_start(job_id, bs, target,
3644 has_replaces ? replaces : NULL,
3645 speed, granularity, buf_size, sync, backing_mode,
3646 on_source_error, on_target_error, unmap, filter_node_name,
3647 copy_mode, errp);
3648 }
3649
3650 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3651 {
3652 BlockDriverState *bs;
3653 BlockDriverState *source, *target_bs;
3654 AioContext *aio_context;
3655 BlockMirrorBackingMode backing_mode;
3656 Error *local_err = NULL;
3657 QDict *options = NULL;
3658 int flags;
3659 int64_t size;
3660 const char *format = arg->format;
3661
3662 bs = qmp_get_root_bs(arg->device, errp);
3663 if (!bs) {
3664 return;
3665 }
3666
3667 /* Early check to avoid creating target */
3668 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3669 return;
3670 }
3671
3672 aio_context = bdrv_get_aio_context(bs);
3673 aio_context_acquire(aio_context);
3674
3675 if (!arg->has_mode) {
3676 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3677 }
3678
3679 if (!arg->has_format) {
3680 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3681 ? NULL : bs->drv->format_name);
3682 }
3683
3684 flags = bs->open_flags | BDRV_O_RDWR;
3685 source = backing_bs(bs);
3686 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
3687 arg->sync = MIRROR_SYNC_MODE_FULL;
3688 }
3689 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3690 source = bs;
3691 }
3692
3693 size = bdrv_getlength(bs);
3694 if (size < 0) {
3695 error_setg_errno(errp, -size, "bdrv_getlength failed");
3696 goto out;
3697 }
3698
3699 if (arg->has_replaces) {
3700 BlockDriverState *to_replace_bs;
3701 AioContext *replace_aio_context;
3702 int64_t replace_size;
3703
3704 if (!arg->has_node_name) {
3705 error_setg(errp, "a node-name must be provided when replacing a"
3706 " named node of the graph");
3707 goto out;
3708 }
3709
3710 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
3711
3712 if (!to_replace_bs) {
3713 error_propagate(errp, local_err);
3714 goto out;
3715 }
3716
3717 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3718 aio_context_acquire(replace_aio_context);
3719 replace_size = bdrv_getlength(to_replace_bs);
3720 aio_context_release(replace_aio_context);
3721
3722 if (size != replace_size) {
3723 error_setg(errp, "cannot replace image with a mirror image of "
3724 "different size");
3725 goto out;
3726 }
3727 }
3728
3729 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3730 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3731 } else {
3732 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3733 }
3734
3735 /* Don't open backing image in create() */
3736 flags |= BDRV_O_NO_BACKING;
3737
3738 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
3739 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3740 {
3741 /* create new image w/o backing file */
3742 assert(format);
3743 bdrv_img_create(arg->target, format,
3744 NULL, NULL, NULL, size, flags, false, &local_err);
3745 } else {
3746 switch (arg->mode) {
3747 case NEW_IMAGE_MODE_EXISTING:
3748 break;
3749 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3750 /* create new image with backing file */
3751 bdrv_img_create(arg->target, format,
3752 source->filename,
3753 source->drv->format_name,
3754 NULL, size, flags, false, &local_err);
3755 break;
3756 default:
3757 abort();
3758 }
3759 }
3760
3761 if (local_err) {
3762 error_propagate(errp, local_err);
3763 goto out;
3764 }
3765
3766 options = qdict_new();
3767 if (arg->has_node_name) {
3768 qdict_put_str(options, "node-name", arg->node_name);
3769 }
3770 if (format) {
3771 qdict_put_str(options, "driver", format);
3772 }
3773
3774 /* Mirroring takes care of copy-on-write using the source's backing
3775 * file.
3776 */
3777 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3778 if (!target_bs) {
3779 goto out;
3780 }
3781
3782 bdrv_set_aio_context(target_bs, aio_context);
3783
3784 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3785 arg->has_replaces, arg->replaces, arg->sync,
3786 backing_mode, arg->has_speed, arg->speed,
3787 arg->has_granularity, arg->granularity,
3788 arg->has_buf_size, arg->buf_size,
3789 arg->has_on_source_error, arg->on_source_error,
3790 arg->has_on_target_error, arg->on_target_error,
3791 arg->has_unmap, arg->unmap,
3792 false, NULL,
3793 arg->has_copy_mode, arg->copy_mode,
3794 &local_err);
3795 bdrv_unref(target_bs);
3796 error_propagate(errp, local_err);
3797 out:
3798 aio_context_release(aio_context);
3799 }
3800
3801 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3802 const char *device, const char *target,
3803 bool has_replaces, const char *replaces,
3804 MirrorSyncMode sync,
3805 bool has_speed, int64_t speed,
3806 bool has_granularity, uint32_t granularity,
3807 bool has_buf_size, int64_t buf_size,
3808 bool has_on_source_error,
3809 BlockdevOnError on_source_error,
3810 bool has_on_target_error,
3811 BlockdevOnError on_target_error,
3812 bool has_filter_node_name,
3813 const char *filter_node_name,
3814 bool has_copy_mode, MirrorCopyMode copy_mode,
3815 Error **errp)
3816 {
3817 BlockDriverState *bs;
3818 BlockDriverState *target_bs;
3819 AioContext *aio_context;
3820 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3821 Error *local_err = NULL;
3822
3823 bs = qmp_get_root_bs(device, errp);
3824 if (!bs) {
3825 return;
3826 }
3827
3828 target_bs = bdrv_lookup_bs(target, target, errp);
3829 if (!target_bs) {
3830 return;
3831 }
3832
3833 aio_context = bdrv_get_aio_context(bs);
3834 aio_context_acquire(aio_context);
3835
3836 bdrv_set_aio_context(target_bs, aio_context);
3837
3838 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3839 has_replaces, replaces, sync, backing_mode,
3840 has_speed, speed,
3841 has_granularity, granularity,
3842 has_buf_size, buf_size,
3843 has_on_source_error, on_source_error,
3844 has_on_target_error, on_target_error,
3845 true, true,
3846 has_filter_node_name, filter_node_name,
3847 has_copy_mode, copy_mode,
3848 &local_err);
3849 error_propagate(errp, local_err);
3850
3851 aio_context_release(aio_context);
3852 }
3853
3854 /* Get a block job using its ID and acquire its AioContext */
3855 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3856 Error **errp)
3857 {
3858 BlockJob *job;
3859
3860 assert(id != NULL);
3861
3862 *aio_context = NULL;
3863
3864 job = block_job_get(id);
3865
3866 if (!job) {
3867 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3868 "Block job '%s' not found", id);
3869 return NULL;
3870 }
3871
3872 *aio_context = blk_get_aio_context(job->blk);
3873 aio_context_acquire(*aio_context);
3874
3875 return job;
3876 }
3877
3878 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3879 {
3880 AioContext *aio_context;
3881 BlockJob *job = find_block_job(device, &aio_context, errp);
3882
3883 if (!job) {
3884 return;
3885 }
3886
3887 block_job_set_speed(job, speed, errp);
3888 aio_context_release(aio_context);
3889 }
3890
3891 void qmp_block_job_cancel(const char *device,
3892 bool has_force, bool force, Error **errp)
3893 {
3894 AioContext *aio_context;
3895 BlockJob *job = find_block_job(device, &aio_context, errp);
3896
3897 if (!job) {
3898 return;
3899 }
3900
3901 if (!has_force) {
3902 force = false;
3903 }
3904
3905 if (job_user_paused(&job->job) && !force) {
3906 error_setg(errp, "The block job for device '%s' is currently paused",
3907 device);
3908 goto out;
3909 }
3910
3911 trace_qmp_block_job_cancel(job);
3912 job_user_cancel(&job->job, force, errp);
3913 out:
3914 aio_context_release(aio_context);
3915 }
3916
3917 void qmp_block_job_pause(const char *device, Error **errp)
3918 {
3919 AioContext *aio_context;
3920 BlockJob *job = find_block_job(device, &aio_context, errp);
3921
3922 if (!job) {
3923 return;
3924 }
3925
3926 trace_qmp_block_job_pause(job);
3927 job_user_pause(&job->job, errp);
3928 aio_context_release(aio_context);
3929 }
3930
3931 void qmp_block_job_resume(const char *device, Error **errp)
3932 {
3933 AioContext *aio_context;
3934 BlockJob *job = find_block_job(device, &aio_context, errp);
3935
3936 if (!job) {
3937 return;
3938 }
3939
3940 trace_qmp_block_job_resume(job);
3941 job_user_resume(&job->job, errp);
3942 aio_context_release(aio_context);
3943 }
3944
3945 void qmp_block_job_complete(const char *device, Error **errp)
3946 {
3947 AioContext *aio_context;
3948 BlockJob *job = find_block_job(device, &aio_context, errp);
3949
3950 if (!job) {
3951 return;
3952 }
3953
3954 trace_qmp_block_job_complete(job);
3955 job_complete(&job->job, errp);
3956 aio_context_release(aio_context);
3957 }
3958
3959 void qmp_block_job_finalize(const char *id, Error **errp)
3960 {
3961 AioContext *aio_context;
3962 BlockJob *job = find_block_job(id, &aio_context, errp);
3963
3964 if (!job) {
3965 return;
3966 }
3967
3968 trace_qmp_block_job_finalize(job);
3969 job_finalize(&job->job, errp);
3970 aio_context_release(aio_context);
3971 }
3972
3973 void qmp_block_job_dismiss(const char *id, Error **errp)
3974 {
3975 AioContext *aio_context;
3976 BlockJob *bjob = find_block_job(id, &aio_context, errp);
3977 Job *job;
3978
3979 if (!bjob) {
3980 return;
3981 }
3982
3983 trace_qmp_block_job_dismiss(bjob);
3984 job = &bjob->job;
3985 job_dismiss(&job, errp);
3986 aio_context_release(aio_context);
3987 }
3988
3989 void qmp_change_backing_file(const char *device,
3990 const char *image_node_name,
3991 const char *backing_file,
3992 Error **errp)
3993 {
3994 BlockDriverState *bs = NULL;
3995 AioContext *aio_context;
3996 BlockDriverState *image_bs = NULL;
3997 Error *local_err = NULL;
3998 bool ro;
3999 int open_flags;
4000 int ret;
4001
4002 bs = qmp_get_root_bs(device, errp);
4003 if (!bs) {
4004 return;
4005 }
4006
4007 aio_context = bdrv_get_aio_context(bs);
4008 aio_context_acquire(aio_context);
4009
4010 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
4011 if (local_err) {
4012 error_propagate(errp, local_err);
4013 goto out;
4014 }
4015
4016 if (!image_bs) {
4017 error_setg(errp, "image file not found");
4018 goto out;
4019 }
4020
4021 if (bdrv_find_base(image_bs) == image_bs) {
4022 error_setg(errp, "not allowing backing file change on an image "
4023 "without a backing file");
4024 goto out;
4025 }
4026
4027 /* even though we are not necessarily operating on bs, we need it to
4028 * determine if block ops are currently prohibited on the chain */
4029 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
4030 goto out;
4031 }
4032
4033 /* final sanity check */
4034 if (!bdrv_chain_contains(bs, image_bs)) {
4035 error_setg(errp, "'%s' and image file are not in the same chain",
4036 device);
4037 goto out;
4038 }
4039
4040 /* if not r/w, reopen to make r/w */
4041 open_flags = image_bs->open_flags;
4042 ro = bdrv_is_read_only(image_bs);
4043
4044 if (ro) {
4045 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
4046 if (local_err) {
4047 error_propagate(errp, local_err);
4048 goto out;
4049 }
4050 }
4051
4052 ret = bdrv_change_backing_file(image_bs, backing_file,
4053 image_bs->drv ? image_bs->drv->format_name : "");
4054
4055 if (ret < 0) {
4056 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
4057 backing_file);
4058 /* don't exit here, so we can try to restore open flags if
4059 * appropriate */
4060 }
4061
4062 if (ro) {
4063 bdrv_reopen(image_bs, open_flags, &local_err);
4064 error_propagate(errp, local_err);
4065 }
4066
4067 out:
4068 aio_context_release(aio_context);
4069 }
4070
4071 void hmp_drive_add_node(Monitor *mon, const char *optstr)
4072 {
4073 QemuOpts *opts;
4074 QDict *qdict;
4075 Error *local_err = NULL;
4076
4077 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
4078 if (!opts) {
4079 return;
4080 }
4081
4082 qdict = qemu_opts_to_qdict(opts, NULL);
4083
4084 if (!qdict_get_try_str(qdict, "node-name")) {
4085 qobject_unref(qdict);
4086 error_report("'node-name' needs to be specified");
4087 goto out;
4088 }
4089
4090 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
4091 if (!bs) {
4092 error_report_err(local_err);
4093 goto out;
4094 }
4095
4096 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4097
4098 out:
4099 qemu_opts_del(opts);
4100 }
4101
4102 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
4103 {
4104 BlockDriverState *bs;
4105 QObject *obj;
4106 Visitor *v = qobject_output_visitor_new(&obj);
4107 QDict *qdict;
4108 Error *local_err = NULL;
4109
4110 visit_type_BlockdevOptions(v, NULL, &options, &local_err);
4111 if (local_err) {
4112 error_propagate(errp, local_err);
4113 goto fail;
4114 }
4115
4116 visit_complete(v, &obj);
4117 qdict = qobject_to(QDict, obj);
4118
4119 qdict_flatten(qdict);
4120
4121 if (!qdict_get_try_str(qdict, "node-name")) {
4122 error_setg(errp, "'node-name' must be specified for the root node");
4123 goto fail;
4124 }
4125
4126 bs = bds_tree_init(qdict, errp);
4127 if (!bs) {
4128 goto fail;
4129 }
4130
4131 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4132
4133 fail:
4134 visit_free(v);
4135 }
4136
4137 void qmp_blockdev_del(const char *node_name, Error **errp)
4138 {
4139 AioContext *aio_context;
4140 BlockDriverState *bs;
4141
4142 bs = bdrv_find_node(node_name);
4143 if (!bs) {
4144 error_setg(errp, "Cannot find node %s", node_name);
4145 return;
4146 }
4147 if (bdrv_has_blk(bs)) {
4148 error_setg(errp, "Node %s is in use", node_name);
4149 return;
4150 }
4151 aio_context = bdrv_get_aio_context(bs);
4152 aio_context_acquire(aio_context);
4153
4154 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4155 goto out;
4156 }
4157
4158 if (!bs->monitor_list.tqe_prev) {
4159 error_setg(errp, "Node %s is not owned by the monitor",
4160 bs->node_name);
4161 goto out;
4162 }
4163
4164 if (bs->refcnt > 1) {
4165 error_setg(errp, "Block device %s is in use",
4166 bdrv_get_device_or_node_name(bs));
4167 goto out;
4168 }
4169
4170 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4171 bdrv_unref(bs);
4172
4173 out:
4174 aio_context_release(aio_context);
4175 }
4176
4177 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
4178 const char *child_name)
4179 {
4180 BdrvChild *child;
4181
4182 QLIST_FOREACH(child, &parent_bs->children, next) {
4183 if (strcmp(child->name, child_name) == 0) {
4184 return child;
4185 }
4186 }
4187
4188 return NULL;
4189 }
4190
4191 void qmp_x_blockdev_change(const char *parent, bool has_child,
4192 const char *child, bool has_node,
4193 const char *node, Error **errp)
4194 {
4195 BlockDriverState *parent_bs, *new_bs = NULL;
4196 BdrvChild *p_child;
4197
4198 parent_bs = bdrv_lookup_bs(parent, parent, errp);
4199 if (!parent_bs) {
4200 return;
4201 }
4202
4203 if (has_child == has_node) {
4204 if (has_child) {
4205 error_setg(errp, "The parameters child and node are in conflict");
4206 } else {
4207 error_setg(errp, "Either child or node must be specified");
4208 }
4209 return;
4210 }
4211
4212 if (has_child) {
4213 p_child = bdrv_find_child(parent_bs, child);
4214 if (!p_child) {
4215 error_setg(errp, "Node '%s' does not have child '%s'",
4216 parent, child);
4217 return;
4218 }
4219 bdrv_del_child(parent_bs, p_child, errp);
4220 }
4221
4222 if (has_node) {
4223 new_bs = bdrv_find_node(node);
4224 if (!new_bs) {
4225 error_setg(errp, "Node '%s' not found", node);
4226 return;
4227 }
4228 bdrv_add_child(parent_bs, new_bs, errp);
4229 }
4230 }
4231
4232 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4233 {
4234 BlockJobInfoList *head = NULL, **p_next = &head;
4235 BlockJob *job;
4236
4237 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
4238 BlockJobInfoList *elem;
4239 AioContext *aio_context;
4240
4241 if (block_job_is_internal(job)) {
4242 continue;
4243 }
4244 elem = g_new0(BlockJobInfoList, 1);
4245 aio_context = blk_get_aio_context(job->blk);
4246 aio_context_acquire(aio_context);
4247 elem->value = block_job_query(job, errp);
4248 aio_context_release(aio_context);
4249 if (!elem->value) {
4250 g_free(elem);
4251 qapi_free_BlockJobInfoList(head);
4252 return NULL;
4253 }
4254 *p_next = elem;
4255 p_next = &elem->next;
4256 }
4257
4258 return head;
4259 }
4260
4261 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
4262 bool has_force, bool force, Error **errp)
4263 {
4264 AioContext *old_context;
4265 AioContext *new_context;
4266 BlockDriverState *bs;
4267
4268 bs = bdrv_find_node(node_name);
4269 if (!bs) {
4270 error_setg(errp, "Cannot find node %s", node_name);
4271 return;
4272 }
4273
4274 /* Protects against accidents. */
4275 if (!(has_force && force) && bdrv_has_blk(bs)) {
4276 error_setg(errp, "Node %s is associated with a BlockBackend and could "
4277 "be in use (use force=true to override this check)",
4278 node_name);
4279 return;
4280 }
4281
4282 if (iothread->type == QTYPE_QSTRING) {
4283 IOThread *obj = iothread_by_id(iothread->u.s);
4284 if (!obj) {
4285 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
4286 return;
4287 }
4288
4289 new_context = iothread_get_aio_context(obj);
4290 } else {
4291 new_context = qemu_get_aio_context();
4292 }
4293
4294 old_context = bdrv_get_aio_context(bs);
4295 aio_context_acquire(old_context);
4296
4297 bdrv_set_aio_context(bs, new_context);
4298
4299 aio_context_release(old_context);
4300 }
4301
4302 void qmp_x_block_latency_histogram_set(
4303 const char *device,
4304 bool has_boundaries, uint64List *boundaries,
4305 bool has_boundaries_read, uint64List *boundaries_read,
4306 bool has_boundaries_write, uint64List *boundaries_write,
4307 bool has_boundaries_flush, uint64List *boundaries_flush,
4308 Error **errp)
4309 {
4310 BlockBackend *blk = blk_by_name(device);
4311 BlockAcctStats *stats;
4312
4313 if (!blk) {
4314 error_setg(errp, "Device '%s' not found", device);
4315 return;
4316 }
4317 stats = blk_get_stats(blk);
4318
4319 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write &&
4320 !has_boundaries_flush)
4321 {
4322 block_latency_histograms_clear(stats);
4323 return;
4324 }
4325
4326 if (has_boundaries || has_boundaries_read) {
4327 block_latency_histogram_set(
4328 stats, BLOCK_ACCT_READ,
4329 has_boundaries_read ? boundaries_read : boundaries);
4330 }
4331
4332 if (has_boundaries || has_boundaries_write) {
4333 block_latency_histogram_set(
4334 stats, BLOCK_ACCT_WRITE,
4335 has_boundaries_write ? boundaries_write : boundaries);
4336 }
4337
4338 if (has_boundaries || has_boundaries_flush) {
4339 block_latency_histogram_set(
4340 stats, BLOCK_ACCT_FLUSH,
4341 has_boundaries_flush ? boundaries_flush : boundaries);
4342 }
4343 }
4344
4345 QemuOptsList qemu_common_drive_opts = {
4346 .name = "drive",
4347 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4348 .desc = {
4349 {
4350 .name = "snapshot",
4351 .type = QEMU_OPT_BOOL,
4352 .help = "enable/disable snapshot mode",
4353 },{
4354 .name = "aio",
4355 .type = QEMU_OPT_STRING,
4356 .help = "host AIO implementation (threads, native)",
4357 },{
4358 .name = BDRV_OPT_CACHE_WB,
4359 .type = QEMU_OPT_BOOL,
4360 .help = "Enable writeback mode",
4361 },{
4362 .name = "format",
4363 .type = QEMU_OPT_STRING,
4364 .help = "disk format (raw, qcow2, ...)",
4365 },{
4366 .name = "rerror",
4367 .type = QEMU_OPT_STRING,
4368 .help = "read error action",
4369 },{
4370 .name = "werror",
4371 .type = QEMU_OPT_STRING,
4372 .help = "write error action",
4373 },{
4374 .name = BDRV_OPT_READ_ONLY,
4375 .type = QEMU_OPT_BOOL,
4376 .help = "open drive file as read-only",
4377 },
4378
4379 THROTTLE_OPTS,
4380
4381 {
4382 .name = "throttling.group",
4383 .type = QEMU_OPT_STRING,
4384 .help = "name of the block throttling group",
4385 },{
4386 .name = "copy-on-read",
4387 .type = QEMU_OPT_BOOL,
4388 .help = "copy read data from backing file into image file",
4389 },{
4390 .name = "detect-zeroes",
4391 .type = QEMU_OPT_STRING,
4392 .help = "try to optimize zero writes (off, on, unmap)",
4393 },{
4394 .name = "stats-account-invalid",
4395 .type = QEMU_OPT_BOOL,
4396 .help = "whether to account for invalid I/O operations "
4397 "in the statistics",
4398 },{
4399 .name = "stats-account-failed",
4400 .type = QEMU_OPT_BOOL,
4401 .help = "whether to account for failed I/O operations "
4402 "in the statistics",
4403 },
4404 { /* end of list */ }
4405 },
4406 };
4407
4408 QemuOptsList qemu_drive_opts = {
4409 .name = "drive",
4410 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4411 .desc = {
4412 /*
4413 * no elements => accept any params
4414 * validation will happen later
4415 */
4416 { /* end of list */ }
4417 },
4418 };
QEmu