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Merge remote-tracking branch 'remotes/jnsnow/tags/ide-pull-request' into staging
[qemu.git] / blockdev.c
blobf1f520a2653baed5a9df4b0b223f9141a303c6dc
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "qemu/osdep.h"
34 #include "sysemu/block-backend.h"
35 #include "sysemu/blockdev.h"
36 #include "hw/block/block.h"
37 #include "block/blockjob.h"
38 #include "block/throttle-groups.h"
39 #include "monitor/monitor.h"
40 #include "qemu/error-report.h"
41 #include "qemu/option.h"
42 #include "qemu/config-file.h"
43 #include "qapi/qmp/types.h"
44 #include "qapi-visit.h"
45 #include "qapi/qmp/qerror.h"
46 #include "qapi/qmp-output-visitor.h"
47 #include "qapi/util.h"
48 #include "sysemu/sysemu.h"
49 #include "block/block_int.h"
50 #include "qmp-commands.h"
51 #include "trace.h"
52 #include "sysemu/arch_init.h"
53 #include "qemu/cutils.h"
54 #include "qemu/help_option.h"
55
56 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
57 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
58
59 static const char *const if_name[IF_COUNT] = {
60 [IF_NONE] = "none",
61 [IF_IDE] = "ide",
62 [IF_SCSI] = "scsi",
63 [IF_FLOPPY] = "floppy",
64 [IF_PFLASH] = "pflash",
65 [IF_MTD] = "mtd",
66 [IF_SD] = "sd",
67 [IF_VIRTIO] = "virtio",
68 [IF_XEN] = "xen",
69 };
70
71 static int if_max_devs[IF_COUNT] = {
72 /*
73 * Do not change these numbers! They govern how drive option
74 * index maps to unit and bus. That mapping is ABI.
75 *
76 * All controllers used to imlement if=T drives need to support
77 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
78 * Otherwise, some index values map to "impossible" bus, unit
79 * values.
80 *
81 * For instance, if you change [IF_SCSI] to 255, -drive
82 * if=scsi,index=12 no longer means bus=1,unit=5, but
83 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
84 * the drive can't be set up. Regression.
85 */
86 [IF_IDE] = 2,
87 [IF_SCSI] = 7,
88 };
89
90 /**
91 * Boards may call this to offer board-by-board overrides
92 * of the default, global values.
93 */
94 void override_max_devs(BlockInterfaceType type, int max_devs)
95 {
96 BlockBackend *blk;
97 DriveInfo *dinfo;
98
99 if (max_devs <= 0) {
100 return;
101 }
102
103 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
104 dinfo = blk_legacy_dinfo(blk);
105 if (dinfo->type == type) {
106 fprintf(stderr, "Cannot override units-per-bus property of"
107 " the %s interface, because a drive of that type has"
108 " already been added.\n", if_name[type]);
109 g_assert_not_reached();
110 }
111 }
112
113 if_max_devs[type] = max_devs;
114 }
115
116 /*
117 * We automatically delete the drive when a device using it gets
118 * unplugged. Questionable feature, but we can't just drop it.
119 * Device models call blockdev_mark_auto_del() to schedule the
120 * automatic deletion, and generic qdev code calls blockdev_auto_del()
121 * when deletion is actually safe.
122 */
123 void blockdev_mark_auto_del(BlockBackend *blk)
124 {
125 DriveInfo *dinfo = blk_legacy_dinfo(blk);
126 BlockDriverState *bs = blk_bs(blk);
127 AioContext *aio_context;
128
129 if (!dinfo) {
130 return;
131 }
132
133 if (bs) {
134 aio_context = bdrv_get_aio_context(bs);
135 aio_context_acquire(aio_context);
136
137 if (bs->job) {
138 block_job_cancel(bs->job);
139 }
140
141 aio_context_release(aio_context);
142 }
143
144 dinfo->auto_del = 1;
145 }
146
147 void blockdev_auto_del(BlockBackend *blk)
148 {
149 DriveInfo *dinfo = blk_legacy_dinfo(blk);
150
151 if (dinfo && dinfo->auto_del) {
152 monitor_remove_blk(blk);
153 blk_unref(blk);
154 }
155 }
156
157 /**
158 * Returns the current mapping of how many units per bus
159 * a particular interface can support.
160 *
161 * A positive integer indicates n units per bus.
162 * 0 implies the mapping has not been established.
163 * -1 indicates an invalid BlockInterfaceType was given.
164 */
165 int drive_get_max_devs(BlockInterfaceType type)
166 {
167 if (type >= IF_IDE && type < IF_COUNT) {
168 return if_max_devs[type];
169 }
170
171 return -1;
172 }
173
174 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
175 {
176 int max_devs = if_max_devs[type];
177 return max_devs ? index / max_devs : 0;
178 }
179
180 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
181 {
182 int max_devs = if_max_devs[type];
183 return max_devs ? index % max_devs : index;
184 }
185
186 QemuOpts *drive_def(const char *optstr)
187 {
188 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
189 }
190
191 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
192 const char *optstr)
193 {
194 QemuOpts *opts;
195
196 opts = drive_def(optstr);
197 if (!opts) {
198 return NULL;
199 }
200 if (type != IF_DEFAULT) {
201 qemu_opt_set(opts, "if", if_name[type], &error_abort);
202 }
203 if (index >= 0) {
204 qemu_opt_set_number(opts, "index", index, &error_abort);
205 }
206 if (file)
207 qemu_opt_set(opts, "file", file, &error_abort);
208 return opts;
209 }
210
211 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
212 {
213 BlockBackend *blk;
214 DriveInfo *dinfo;
215
216 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
217 dinfo = blk_legacy_dinfo(blk);
218 if (dinfo && dinfo->type == type
219 && dinfo->bus == bus && dinfo->unit == unit) {
220 return dinfo;
221 }
222 }
223
224 return NULL;
225 }
226
227 bool drive_check_orphaned(void)
228 {
229 BlockBackend *blk;
230 DriveInfo *dinfo;
231 bool rs = false;
232
233 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
234 dinfo = blk_legacy_dinfo(blk);
235 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
236 /* Unless this is a default drive, this may be an oversight. */
237 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
238 dinfo->type != IF_NONE) {
239 fprintf(stderr, "Warning: Orphaned drive without device: "
240 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
241 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
242 if_name[dinfo->type], dinfo->bus, dinfo->unit);
243 rs = true;
244 }
245 }
246
247 return rs;
248 }
249
250 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
251 {
252 return drive_get(type,
253 drive_index_to_bus_id(type, index),
254 drive_index_to_unit_id(type, index));
255 }
256
257 int drive_get_max_bus(BlockInterfaceType type)
258 {
259 int max_bus;
260 BlockBackend *blk;
261 DriveInfo *dinfo;
262
263 max_bus = -1;
264 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
265 dinfo = blk_legacy_dinfo(blk);
266 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
267 max_bus = dinfo->bus;
268 }
269 }
270 return max_bus;
271 }
272
273 /* Get a block device. This should only be used for single-drive devices
274 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
275 appropriate bus. */
276 DriveInfo *drive_get_next(BlockInterfaceType type)
277 {
278 static int next_block_unit[IF_COUNT];
279
280 return drive_get(type, 0, next_block_unit[type]++);
281 }
282
283 static void bdrv_format_print(void *opaque, const char *name)
284 {
285 error_printf(" %s", name);
286 }
287
288 typedef struct {
289 QEMUBH *bh;
290 BlockDriverState *bs;
291 } BDRVPutRefBH;
292
293 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
294 {
295 if (!strcmp(buf, "ignore")) {
296 return BLOCKDEV_ON_ERROR_IGNORE;
297 } else if (!is_read && !strcmp(buf, "enospc")) {
298 return BLOCKDEV_ON_ERROR_ENOSPC;
299 } else if (!strcmp(buf, "stop")) {
300 return BLOCKDEV_ON_ERROR_STOP;
301 } else if (!strcmp(buf, "report")) {
302 return BLOCKDEV_ON_ERROR_REPORT;
303 } else {
304 error_setg(errp, "'%s' invalid %s error action",
305 buf, is_read ? "read" : "write");
306 return -1;
307 }
308 }
309
310 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
311 Error **errp)
312 {
313 const QListEntry *entry;
314 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
315 switch (qobject_type(entry->value)) {
316
317 case QTYPE_QSTRING: {
318 unsigned long long length;
319 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
320 if (parse_uint_full(str, &length, 10) == 0 &&
321 length > 0 && length <= UINT_MAX) {
322 block_acct_add_interval(stats, (unsigned) length);
323 } else {
324 error_setg(errp, "Invalid interval length: %s", str);
325 return false;
326 }
327 break;
328 }
329
330 case QTYPE_QINT: {
331 int64_t length = qint_get_int(qobject_to_qint(entry->value));
332 if (length > 0 && length <= UINT_MAX) {
333 block_acct_add_interval(stats, (unsigned) length);
334 } else {
335 error_setg(errp, "Invalid interval length: %" PRId64, length);
336 return false;
337 }
338 break;
339 }
340
341 default:
342 error_setg(errp, "The specification of stats-intervals is invalid");
343 return false;
344 }
345 }
346 return true;
347 }
348
349 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
350
351 /* All parameters but @opts are optional and may be set to NULL. */
352 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
353 const char **throttling_group, ThrottleConfig *throttle_cfg,
354 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
355 {
356 const char *discard;
357 Error *local_error = NULL;
358 const char *aio;
359
360 if (bdrv_flags) {
361 if (!qemu_opt_get_bool(opts, "read-only", false)) {
362 *bdrv_flags |= BDRV_O_RDWR;
363 }
364 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
365 *bdrv_flags |= BDRV_O_COPY_ON_READ;
366 }
367
368 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
369 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
370 error_setg(errp, "Invalid discard option");
371 return;
372 }
373 }
374
375 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
376 if (!strcmp(aio, "native")) {
377 *bdrv_flags |= BDRV_O_NATIVE_AIO;
378 } else if (!strcmp(aio, "threads")) {
379 /* this is the default */
380 } else {
381 error_setg(errp, "invalid aio option");
382 return;
383 }
384 }
385 }
386
387 /* disk I/O throttling */
388 if (throttling_group) {
389 *throttling_group = qemu_opt_get(opts, "throttling.group");
390 }
391
392 if (throttle_cfg) {
393 throttle_config_init(throttle_cfg);
394 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
395 qemu_opt_get_number(opts, "throttling.bps-total", 0);
396 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
397 qemu_opt_get_number(opts, "throttling.bps-read", 0);
398 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
399 qemu_opt_get_number(opts, "throttling.bps-write", 0);
400 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
401 qemu_opt_get_number(opts, "throttling.iops-total", 0);
402 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
403 qemu_opt_get_number(opts, "throttling.iops-read", 0);
404 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
405 qemu_opt_get_number(opts, "throttling.iops-write", 0);
406
407 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
408 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
409 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
410 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
411 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
412 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
413 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
414 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
415 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
416 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
417 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
418 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
419
420 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
421 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
422 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
423 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
424 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
425 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
426 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
427 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
428 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
429 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
430 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
431 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
432
433 throttle_cfg->op_size =
434 qemu_opt_get_number(opts, "throttling.iops-size", 0);
435
436 if (!throttle_is_valid(throttle_cfg, errp)) {
437 return;
438 }
439 }
440
441 if (detect_zeroes) {
442 *detect_zeroes =
443 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
444 qemu_opt_get(opts, "detect-zeroes"),
445 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
446 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
447 &local_error);
448 if (local_error) {
449 error_propagate(errp, local_error);
450 return;
451 }
452
453 if (bdrv_flags &&
454 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
455 !(*bdrv_flags & BDRV_O_UNMAP))
456 {
457 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
458 "without setting discard operation to unmap");
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;
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 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
514 qdict_array_split(interval_dict, &interval_list);
515
516 if (qdict_size(interval_dict) != 0) {
517 error_setg(errp, "Invalid option stats-intervals.%s",
518 qdict_first(interval_dict)->key);
519 goto early_err;
520 }
521
522 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
523 &detect_zeroes, &error);
524 if (error) {
525 error_propagate(errp, error);
526 goto early_err;
527 }
528
529 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
530 if (is_help_option(buf)) {
531 error_printf("Supported formats:");
532 bdrv_iterate_format(bdrv_format_print, NULL);
533 error_printf("\n");
534 goto early_err;
535 }
536
537 if (qdict_haskey(bs_opts, "driver")) {
538 error_setg(errp, "Cannot specify both 'driver' and 'format'");
539 goto early_err;
540 }
541 qdict_put(bs_opts, "driver", qstring_from_str(buf));
542 }
543
544 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
545 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
546 on_write_error = parse_block_error_action(buf, 0, &error);
547 if (error) {
548 error_propagate(errp, error);
549 goto early_err;
550 }
551 }
552
553 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
554 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
555 on_read_error = parse_block_error_action(buf, 1, &error);
556 if (error) {
557 error_propagate(errp, error);
558 goto early_err;
559 }
560 }
561
562 if (snapshot) {
563 bdrv_flags |= BDRV_O_SNAPSHOT;
564 }
565
566 /* init */
567 if ((!file || !*file) && !qdict_size(bs_opts)) {
568 BlockBackendRootState *blk_rs;
569
570 blk = blk_new(errp);
571 if (!blk) {
572 goto early_err;
573 }
574
575 blk_rs = blk_get_root_state(blk);
576 blk_rs->open_flags = bdrv_flags;
577 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
578 blk_rs->detect_zeroes = detect_zeroes;
579
580 if (throttle_enabled(&cfg)) {
581 if (!throttling_group) {
582 throttling_group = blk_name(blk);
583 }
584 blk_rs->throttle_group = g_strdup(throttling_group);
585 blk_rs->throttle_state = throttle_group_incref(throttling_group);
586 blk_rs->throttle_state->cfg = cfg;
587 }
588
589 QDECREF(bs_opts);
590 } else {
591 if (file && !*file) {
592 file = NULL;
593 }
594
595 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
596 * with other callers) rather than what we want as the real defaults.
597 * Apply the defaults here instead. */
598 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
599 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
600 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
601
602 if (runstate_check(RUN_STATE_INMIGRATE)) {
603 bdrv_flags |= BDRV_O_INACTIVE;
604 }
605
606 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
607 if (!blk) {
608 goto err_no_bs_opts;
609 }
610 bs = blk_bs(blk);
611
612 bs->detect_zeroes = detect_zeroes;
613
614 /* disk I/O throttling */
615 if (throttle_enabled(&cfg)) {
616 if (!throttling_group) {
617 throttling_group = blk_name(blk);
618 }
619 bdrv_io_limits_enable(bs, throttling_group);
620 bdrv_set_io_limits(bs, &cfg);
621 }
622
623 if (bdrv_key_required(bs)) {
624 autostart = 0;
625 }
626
627 block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
628
629 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
630 blk_unref(blk);
631 blk = NULL;
632 goto err_no_bs_opts;
633 }
634 }
635
636 blk_set_enable_write_cache(blk, !writethrough);
637 blk_set_on_error(blk, on_read_error, on_write_error);
638
639 if (!monitor_add_blk(blk, qemu_opts_id(opts), errp)) {
640 blk_unref(blk);
641 blk = NULL;
642 goto err_no_bs_opts;
643 }
644
645 err_no_bs_opts:
646 qemu_opts_del(opts);
647 QDECREF(interval_dict);
648 QDECREF(interval_list);
649 return blk;
650
651 early_err:
652 qemu_opts_del(opts);
653 QDECREF(interval_dict);
654 QDECREF(interval_list);
655 err_no_opts:
656 QDECREF(bs_opts);
657 return NULL;
658 }
659
660 static QemuOptsList qemu_root_bds_opts;
661
662 /* Takes the ownership of bs_opts */
663 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
664 {
665 BlockDriverState *bs;
666 QemuOpts *opts;
667 Error *local_error = NULL;
668 BlockdevDetectZeroesOptions detect_zeroes;
669 int ret;
670 int bdrv_flags = 0;
671
672 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
673 if (!opts) {
674 goto fail;
675 }
676
677 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
678 if (local_error) {
679 error_propagate(errp, local_error);
680 goto fail;
681 }
682
683 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
684 &detect_zeroes, &local_error);
685 if (local_error) {
686 error_propagate(errp, local_error);
687 goto fail;
688 }
689
690 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
691 * with other callers) rather than what we want as the real defaults.
692 * Apply the defaults here instead. */
693 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
694 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
695
696 if (runstate_check(RUN_STATE_INMIGRATE)) {
697 bdrv_flags |= BDRV_O_INACTIVE;
698 }
699
700 bs = NULL;
701 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
702 if (ret < 0) {
703 goto fail_no_bs_opts;
704 }
705
706 bs->detect_zeroes = detect_zeroes;
707
708 fail_no_bs_opts:
709 qemu_opts_del(opts);
710 return bs;
711
712 fail:
713 qemu_opts_del(opts);
714 QDECREF(bs_opts);
715 return NULL;
716 }
717
718 void blockdev_close_all_bdrv_states(void)
719 {
720 BlockDriverState *bs, *next_bs;
721
722 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
723 AioContext *ctx = bdrv_get_aio_context(bs);
724
725 aio_context_acquire(ctx);
726 bdrv_unref(bs);
727 aio_context_release(ctx);
728 }
729 }
730
731 /* Iterates over the list of monitor-owned BlockDriverStates */
732 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
733 {
734 return bs ? QTAILQ_NEXT(bs, monitor_list)
735 : QTAILQ_FIRST(&monitor_bdrv_states);
736 }
737
738 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
739 Error **errp)
740 {
741 const char *value;
742
743 value = qemu_opt_get(opts, from);
744 if (value) {
745 if (qemu_opt_find(opts, to)) {
746 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
747 "same time", to, from);
748 return;
749 }
750 }
751
752 /* rename all items in opts */
753 while ((value = qemu_opt_get(opts, from))) {
754 qemu_opt_set(opts, to, value, &error_abort);
755 qemu_opt_unset(opts, from);
756 }
757 }
758
759 QemuOptsList qemu_legacy_drive_opts = {
760 .name = "drive",
761 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
762 .desc = {
763 {
764 .name = "bus",
765 .type = QEMU_OPT_NUMBER,
766 .help = "bus number",
767 },{
768 .name = "unit",
769 .type = QEMU_OPT_NUMBER,
770 .help = "unit number (i.e. lun for scsi)",
771 },{
772 .name = "index",
773 .type = QEMU_OPT_NUMBER,
774 .help = "index number",
775 },{
776 .name = "media",
777 .type = QEMU_OPT_STRING,
778 .help = "media type (disk, cdrom)",
779 },{
780 .name = "if",
781 .type = QEMU_OPT_STRING,
782 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
783 },{
784 .name = "cyls",
785 .type = QEMU_OPT_NUMBER,
786 .help = "number of cylinders (ide disk geometry)",
787 },{
788 .name = "heads",
789 .type = QEMU_OPT_NUMBER,
790 .help = "number of heads (ide disk geometry)",
791 },{
792 .name = "secs",
793 .type = QEMU_OPT_NUMBER,
794 .help = "number of sectors (ide disk geometry)",
795 },{
796 .name = "trans",
797 .type = QEMU_OPT_STRING,
798 .help = "chs translation (auto, lba, none)",
799 },{
800 .name = "boot",
801 .type = QEMU_OPT_BOOL,
802 .help = "(deprecated, ignored)",
803 },{
804 .name = "addr",
805 .type = QEMU_OPT_STRING,
806 .help = "pci address (virtio only)",
807 },{
808 .name = "serial",
809 .type = QEMU_OPT_STRING,
810 .help = "disk serial number",
811 },{
812 .name = "file",
813 .type = QEMU_OPT_STRING,
814 .help = "file name",
815 },
816
817 /* Options that are passed on, but have special semantics with -drive */
818 {
819 .name = "read-only",
820 .type = QEMU_OPT_BOOL,
821 .help = "open drive file as read-only",
822 },{
823 .name = "rerror",
824 .type = QEMU_OPT_STRING,
825 .help = "read error action",
826 },{
827 .name = "werror",
828 .type = QEMU_OPT_STRING,
829 .help = "write error action",
830 },{
831 .name = "copy-on-read",
832 .type = QEMU_OPT_BOOL,
833 .help = "copy read data from backing file into image file",
834 },
835
836 { /* end of list */ }
837 },
838 };
839
840 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
841 {
842 const char *value;
843 BlockBackend *blk;
844 DriveInfo *dinfo = NULL;
845 QDict *bs_opts;
846 QemuOpts *legacy_opts;
847 DriveMediaType media = MEDIA_DISK;
848 BlockInterfaceType type;
849 int cyls, heads, secs, translation;
850 int max_devs, bus_id, unit_id, index;
851 const char *devaddr;
852 const char *werror, *rerror;
853 bool read_only = false;
854 bool copy_on_read;
855 const char *serial;
856 const char *filename;
857 Error *local_err = NULL;
858 int i;
859
860 /* Change legacy command line options into QMP ones */
861 static const struct {
862 const char *from;
863 const char *to;
864 } opt_renames[] = {
865 { "iops", "throttling.iops-total" },
866 { "iops_rd", "throttling.iops-read" },
867 { "iops_wr", "throttling.iops-write" },
868
869 { "bps", "throttling.bps-total" },
870 { "bps_rd", "throttling.bps-read" },
871 { "bps_wr", "throttling.bps-write" },
872
873 { "iops_max", "throttling.iops-total-max" },
874 { "iops_rd_max", "throttling.iops-read-max" },
875 { "iops_wr_max", "throttling.iops-write-max" },
876
877 { "bps_max", "throttling.bps-total-max" },
878 { "bps_rd_max", "throttling.bps-read-max" },
879 { "bps_wr_max", "throttling.bps-write-max" },
880
881 { "iops_size", "throttling.iops-size" },
882
883 { "group", "throttling.group" },
884
885 { "readonly", "read-only" },
886 };
887
888 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
889 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
890 &local_err);
891 if (local_err) {
892 error_report_err(local_err);
893 return NULL;
894 }
895 }
896
897 value = qemu_opt_get(all_opts, "cache");
898 if (value) {
899 int flags = 0;
900 bool writethrough;
901
902 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
903 error_report("invalid cache option");
904 return NULL;
905 }
906
907 /* Specific options take precedence */
908 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
909 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
910 !writethrough, &error_abort);
911 }
912 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
913 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
914 !!(flags & BDRV_O_NOCACHE), &error_abort);
915 }
916 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
917 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
918 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
919 }
920 qemu_opt_unset(all_opts, "cache");
921 }
922
923 /* Get a QDict for processing the options */
924 bs_opts = qdict_new();
925 qemu_opts_to_qdict(all_opts, bs_opts);
926
927 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
928 &error_abort);
929 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
930 if (local_err) {
931 error_report_err(local_err);
932 goto fail;
933 }
934
935 /* Deprecated option boot=[on|off] */
936 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
937 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
938 "ignored. Future versions will reject this parameter. Please "
939 "update your scripts.\n");
940 }
941
942 /* Media type */
943 value = qemu_opt_get(legacy_opts, "media");
944 if (value) {
945 if (!strcmp(value, "disk")) {
946 media = MEDIA_DISK;
947 } else if (!strcmp(value, "cdrom")) {
948 media = MEDIA_CDROM;
949 read_only = true;
950 } else {
951 error_report("'%s' invalid media", value);
952 goto fail;
953 }
954 }
955
956 /* copy-on-read is disabled with a warning for read-only devices */
957 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
958 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
959
960 if (read_only && copy_on_read) {
961 error_report("warning: disabling copy-on-read on read-only drive");
962 copy_on_read = false;
963 }
964
965 qdict_put(bs_opts, "read-only",
966 qstring_from_str(read_only ? "on" : "off"));
967 qdict_put(bs_opts, "copy-on-read",
968 qstring_from_str(copy_on_read ? "on" :"off"));
969
970 /* Controller type */
971 value = qemu_opt_get(legacy_opts, "if");
972 if (value) {
973 for (type = 0;
974 type < IF_COUNT && strcmp(value, if_name[type]);
975 type++) {
976 }
977 if (type == IF_COUNT) {
978 error_report("unsupported bus type '%s'", value);
979 goto fail;
980 }
981 } else {
982 type = block_default_type;
983 }
984
985 /* Geometry */
986 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
987 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
988 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
989
990 if (cyls || heads || secs) {
991 if (cyls < 1) {
992 error_report("invalid physical cyls number");
993 goto fail;
994 }
995 if (heads < 1) {
996 error_report("invalid physical heads number");
997 goto fail;
998 }
999 if (secs < 1) {
1000 error_report("invalid physical secs number");
1001 goto fail;
1002 }
1003 }
1004
1005 translation = BIOS_ATA_TRANSLATION_AUTO;
1006 value = qemu_opt_get(legacy_opts, "trans");
1007 if (value != NULL) {
1008 if (!cyls) {
1009 error_report("'%s' trans must be used with cyls, heads and secs",
1010 value);
1011 goto fail;
1012 }
1013 if (!strcmp(value, "none")) {
1014 translation = BIOS_ATA_TRANSLATION_NONE;
1015 } else if (!strcmp(value, "lba")) {
1016 translation = BIOS_ATA_TRANSLATION_LBA;
1017 } else if (!strcmp(value, "large")) {
1018 translation = BIOS_ATA_TRANSLATION_LARGE;
1019 } else if (!strcmp(value, "rechs")) {
1020 translation = BIOS_ATA_TRANSLATION_RECHS;
1021 } else if (!strcmp(value, "auto")) {
1022 translation = BIOS_ATA_TRANSLATION_AUTO;
1023 } else {
1024 error_report("'%s' invalid translation type", value);
1025 goto fail;
1026 }
1027 }
1028
1029 if (media == MEDIA_CDROM) {
1030 if (cyls || secs || heads) {
1031 error_report("CHS can't be set with media=cdrom");
1032 goto fail;
1033 }
1034 }
1035
1036 /* Device address specified by bus/unit or index.
1037 * If none was specified, try to find the first free one. */
1038 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
1039 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
1040 index = qemu_opt_get_number(legacy_opts, "index", -1);
1041
1042 max_devs = if_max_devs[type];
1043
1044 if (index != -1) {
1045 if (bus_id != 0 || unit_id != -1) {
1046 error_report("index cannot be used with bus and unit");
1047 goto fail;
1048 }
1049 bus_id = drive_index_to_bus_id(type, index);
1050 unit_id = drive_index_to_unit_id(type, index);
1051 }
1052
1053 if (unit_id == -1) {
1054 unit_id = 0;
1055 while (drive_get(type, bus_id, unit_id) != NULL) {
1056 unit_id++;
1057 if (max_devs && unit_id >= max_devs) {
1058 unit_id -= max_devs;
1059 bus_id++;
1060 }
1061 }
1062 }
1063
1064 if (max_devs && unit_id >= max_devs) {
1065 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1066 goto fail;
1067 }
1068
1069 if (drive_get(type, bus_id, unit_id) != NULL) {
1070 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1071 bus_id, unit_id, index);
1072 goto fail;
1073 }
1074
1075 /* Serial number */
1076 serial = qemu_opt_get(legacy_opts, "serial");
1077
1078 /* no id supplied -> create one */
1079 if (qemu_opts_id(all_opts) == NULL) {
1080 char *new_id;
1081 const char *mediastr = "";
1082 if (type == IF_IDE || type == IF_SCSI) {
1083 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1084 }
1085 if (max_devs) {
1086 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1087 mediastr, unit_id);
1088 } else {
1089 new_id = g_strdup_printf("%s%s%i", if_name[type],
1090 mediastr, unit_id);
1091 }
1092 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1093 g_free(new_id);
1094 }
1095
1096 /* Add virtio block device */
1097 devaddr = qemu_opt_get(legacy_opts, "addr");
1098 if (devaddr && type != IF_VIRTIO) {
1099 error_report("addr is not supported by this bus type");
1100 goto fail;
1101 }
1102
1103 if (type == IF_VIRTIO) {
1104 QemuOpts *devopts;
1105 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1106 &error_abort);
1107 if (arch_type == QEMU_ARCH_S390X) {
1108 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1109 } else {
1110 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1111 }
1112 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1113 &error_abort);
1114 if (devaddr) {
1115 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1116 }
1117 }
1118
1119 filename = qemu_opt_get(legacy_opts, "file");
1120
1121 /* Check werror/rerror compatibility with if=... */
1122 werror = qemu_opt_get(legacy_opts, "werror");
1123 if (werror != NULL) {
1124 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1125 type != IF_NONE) {
1126 error_report("werror is not supported by this bus type");
1127 goto fail;
1128 }
1129 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1130 }
1131
1132 rerror = qemu_opt_get(legacy_opts, "rerror");
1133 if (rerror != NULL) {
1134 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1135 type != IF_NONE) {
1136 error_report("rerror is not supported by this bus type");
1137 goto fail;
1138 }
1139 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1140 }
1141
1142 /* Actual block device init: Functionality shared with blockdev-add */
1143 blk = blockdev_init(filename, bs_opts, &local_err);
1144 bs_opts = NULL;
1145 if (!blk) {
1146 if (local_err) {
1147 error_report_err(local_err);
1148 }
1149 goto fail;
1150 } else {
1151 assert(!local_err);
1152 }
1153
1154 /* Create legacy DriveInfo */
1155 dinfo = g_malloc0(sizeof(*dinfo));
1156 dinfo->opts = all_opts;
1157
1158 dinfo->cyls = cyls;
1159 dinfo->heads = heads;
1160 dinfo->secs = secs;
1161 dinfo->trans = translation;
1162
1163 dinfo->type = type;
1164 dinfo->bus = bus_id;
1165 dinfo->unit = unit_id;
1166 dinfo->devaddr = devaddr;
1167 dinfo->serial = g_strdup(serial);
1168
1169 blk_set_legacy_dinfo(blk, dinfo);
1170
1171 switch(type) {
1172 case IF_IDE:
1173 case IF_SCSI:
1174 case IF_XEN:
1175 case IF_NONE:
1176 dinfo->media_cd = media == MEDIA_CDROM;
1177 break;
1178 default:
1179 break;
1180 }
1181
1182 fail:
1183 qemu_opts_del(legacy_opts);
1184 QDECREF(bs_opts);
1185 return dinfo;
1186 }
1187
1188 void hmp_commit(Monitor *mon, const QDict *qdict)
1189 {
1190 const char *device = qdict_get_str(qdict, "device");
1191 BlockBackend *blk;
1192 int ret;
1193
1194 if (!strcmp(device, "all")) {
1195 ret = blk_commit_all();
1196 } else {
1197 BlockDriverState *bs;
1198 AioContext *aio_context;
1199
1200 blk = blk_by_name(device);
1201 if (!blk) {
1202 monitor_printf(mon, "Device '%s' not found\n", device);
1203 return;
1204 }
1205 if (!blk_is_available(blk)) {
1206 monitor_printf(mon, "Device '%s' has no medium\n", device);
1207 return;
1208 }
1209
1210 bs = blk_bs(blk);
1211 aio_context = bdrv_get_aio_context(bs);
1212 aio_context_acquire(aio_context);
1213
1214 ret = bdrv_commit(bs);
1215
1216 aio_context_release(aio_context);
1217 }
1218 if (ret < 0) {
1219 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1220 strerror(-ret));
1221 }
1222 }
1223
1224 static void blockdev_do_action(TransactionAction *action, Error **errp)
1225 {
1226 TransactionActionList list;
1227
1228 list.value = action;
1229 list.next = NULL;
1230 qmp_transaction(&list, false, NULL, errp);
1231 }
1232
1233 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1234 bool has_node_name, const char *node_name,
1235 const char *snapshot_file,
1236 bool has_snapshot_node_name,
1237 const char *snapshot_node_name,
1238 bool has_format, const char *format,
1239 bool has_mode, NewImageMode mode, Error **errp)
1240 {
1241 BlockdevSnapshotSync snapshot = {
1242 .has_device = has_device,
1243 .device = (char *) device,
1244 .has_node_name = has_node_name,
1245 .node_name = (char *) node_name,
1246 .snapshot_file = (char *) snapshot_file,
1247 .has_snapshot_node_name = has_snapshot_node_name,
1248 .snapshot_node_name = (char *) snapshot_node_name,
1249 .has_format = has_format,
1250 .format = (char *) format,
1251 .has_mode = has_mode,
1252 .mode = mode,
1253 };
1254 TransactionAction action = {
1255 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1256 .u.blockdev_snapshot_sync.data = &snapshot,
1257 };
1258 blockdev_do_action(&action, errp);
1259 }
1260
1261 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1262 Error **errp)
1263 {
1264 BlockdevSnapshot snapshot_data = {
1265 .node = (char *) node,
1266 .overlay = (char *) overlay
1267 };
1268 TransactionAction action = {
1269 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1270 .u.blockdev_snapshot.data = &snapshot_data,
1271 };
1272 blockdev_do_action(&action, errp);
1273 }
1274
1275 void qmp_blockdev_snapshot_internal_sync(const char *device,
1276 const char *name,
1277 Error **errp)
1278 {
1279 BlockdevSnapshotInternal snapshot = {
1280 .device = (char *) device,
1281 .name = (char *) name
1282 };
1283 TransactionAction action = {
1284 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1285 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1286 };
1287 blockdev_do_action(&action, errp);
1288 }
1289
1290 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1291 bool has_id,
1292 const char *id,
1293 bool has_name,
1294 const char *name,
1295 Error **errp)
1296 {
1297 BlockDriverState *bs;
1298 BlockBackend *blk;
1299 AioContext *aio_context;
1300 QEMUSnapshotInfo sn;
1301 Error *local_err = NULL;
1302 SnapshotInfo *info = NULL;
1303 int ret;
1304
1305 blk = blk_by_name(device);
1306 if (!blk) {
1307 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1308 "Device '%s' not found", device);
1309 return NULL;
1310 }
1311
1312 aio_context = blk_get_aio_context(blk);
1313 aio_context_acquire(aio_context);
1314
1315 if (!has_id) {
1316 id = NULL;
1317 }
1318
1319 if (!has_name) {
1320 name = NULL;
1321 }
1322
1323 if (!id && !name) {
1324 error_setg(errp, "Name or id must be provided");
1325 goto out_aio_context;
1326 }
1327
1328 if (!blk_is_available(blk)) {
1329 error_setg(errp, "Device '%s' has no medium", device);
1330 goto out_aio_context;
1331 }
1332 bs = blk_bs(blk);
1333
1334 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1335 goto out_aio_context;
1336 }
1337
1338 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1339 if (local_err) {
1340 error_propagate(errp, local_err);
1341 goto out_aio_context;
1342 }
1343 if (!ret) {
1344 error_setg(errp,
1345 "Snapshot with id '%s' and name '%s' does not exist on "
1346 "device '%s'",
1347 STR_OR_NULL(id), STR_OR_NULL(name), device);
1348 goto out_aio_context;
1349 }
1350
1351 bdrv_snapshot_delete(bs, id, name, &local_err);
1352 if (local_err) {
1353 error_propagate(errp, local_err);
1354 goto out_aio_context;
1355 }
1356
1357 aio_context_release(aio_context);
1358
1359 info = g_new0(SnapshotInfo, 1);
1360 info->id = g_strdup(sn.id_str);
1361 info->name = g_strdup(sn.name);
1362 info->date_nsec = sn.date_nsec;
1363 info->date_sec = sn.date_sec;
1364 info->vm_state_size = sn.vm_state_size;
1365 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1366 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1367
1368 return info;
1369
1370 out_aio_context:
1371 aio_context_release(aio_context);
1372 return NULL;
1373 }
1374
1375 /**
1376 * block_dirty_bitmap_lookup:
1377 * Return a dirty bitmap (if present), after validating
1378 * the node reference and bitmap names.
1379 *
1380 * @node: The name of the BDS node to search for bitmaps
1381 * @name: The name of the bitmap to search for
1382 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1383 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1384 * @errp: Output pointer for error information. Can be NULL.
1385 *
1386 * @return: A bitmap object on success, or NULL on failure.
1387 */
1388 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1389 const char *name,
1390 BlockDriverState **pbs,
1391 AioContext **paio,
1392 Error **errp)
1393 {
1394 BlockDriverState *bs;
1395 BdrvDirtyBitmap *bitmap;
1396 AioContext *aio_context;
1397
1398 if (!node) {
1399 error_setg(errp, "Node cannot be NULL");
1400 return NULL;
1401 }
1402 if (!name) {
1403 error_setg(errp, "Bitmap name cannot be NULL");
1404 return NULL;
1405 }
1406 bs = bdrv_lookup_bs(node, node, NULL);
1407 if (!bs) {
1408 error_setg(errp, "Node '%s' not found", node);
1409 return NULL;
1410 }
1411
1412 aio_context = bdrv_get_aio_context(bs);
1413 aio_context_acquire(aio_context);
1414
1415 bitmap = bdrv_find_dirty_bitmap(bs, name);
1416 if (!bitmap) {
1417 error_setg(errp, "Dirty bitmap '%s' not found", name);
1418 goto fail;
1419 }
1420
1421 if (pbs) {
1422 *pbs = bs;
1423 }
1424 if (paio) {
1425 *paio = aio_context;
1426 } else {
1427 aio_context_release(aio_context);
1428 }
1429
1430 return bitmap;
1431
1432 fail:
1433 aio_context_release(aio_context);
1434 return NULL;
1435 }
1436
1437 /* New and old BlockDriverState structs for atomic group operations */
1438
1439 typedef struct BlkActionState BlkActionState;
1440
1441 /**
1442 * BlkActionOps:
1443 * Table of operations that define an Action.
1444 *
1445 * @instance_size: Size of state struct, in bytes.
1446 * @prepare: Prepare the work, must NOT be NULL.
1447 * @commit: Commit the changes, can be NULL.
1448 * @abort: Abort the changes on fail, can be NULL.
1449 * @clean: Clean up resources after all transaction actions have called
1450 * commit() or abort(). Can be NULL.
1451 *
1452 * Only prepare() may fail. In a single transaction, only one of commit() or
1453 * abort() will be called. clean() will always be called if it is present.
1454 */
1455 typedef struct BlkActionOps {
1456 size_t instance_size;
1457 void (*prepare)(BlkActionState *common, Error **errp);
1458 void (*commit)(BlkActionState *common);
1459 void (*abort)(BlkActionState *common);
1460 void (*clean)(BlkActionState *common);
1461 } BlkActionOps;
1462
1463 /**
1464 * BlkActionState:
1465 * Describes one Action's state within a Transaction.
1466 *
1467 * @action: QAPI-defined enum identifying which Action to perform.
1468 * @ops: Table of ActionOps this Action can perform.
1469 * @block_job_txn: Transaction which this action belongs to.
1470 * @entry: List membership for all Actions in this Transaction.
1471 *
1472 * This structure must be arranged as first member in a subclassed type,
1473 * assuming that the compiler will also arrange it to the same offsets as the
1474 * base class.
1475 */
1476 struct BlkActionState {
1477 TransactionAction *action;
1478 const BlkActionOps *ops;
1479 BlockJobTxn *block_job_txn;
1480 TransactionProperties *txn_props;
1481 QSIMPLEQ_ENTRY(BlkActionState) entry;
1482 };
1483
1484 /* internal snapshot private data */
1485 typedef struct InternalSnapshotState {
1486 BlkActionState common;
1487 BlockDriverState *bs;
1488 AioContext *aio_context;
1489 QEMUSnapshotInfo sn;
1490 bool created;
1491 } InternalSnapshotState;
1492
1493
1494 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1495 {
1496 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1497 error_setg(errp,
1498 "Action '%s' does not support Transaction property "
1499 "completion-mode = %s",
1500 TransactionActionKind_lookup[s->action->type],
1501 ActionCompletionMode_lookup[s->txn_props->completion_mode]);
1502 return -1;
1503 }
1504 return 0;
1505 }
1506
1507 static void internal_snapshot_prepare(BlkActionState *common,
1508 Error **errp)
1509 {
1510 Error *local_err = NULL;
1511 const char *device;
1512 const char *name;
1513 BlockBackend *blk;
1514 BlockDriverState *bs;
1515 QEMUSnapshotInfo old_sn, *sn;
1516 bool ret;
1517 qemu_timeval tv;
1518 BlockdevSnapshotInternal *internal;
1519 InternalSnapshotState *state;
1520 int ret1;
1521
1522 g_assert(common->action->type ==
1523 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1524 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1525 state = DO_UPCAST(InternalSnapshotState, common, common);
1526
1527 /* 1. parse input */
1528 device = internal->device;
1529 name = internal->name;
1530
1531 /* 2. check for validation */
1532 if (action_check_completion_mode(common, errp) < 0) {
1533 return;
1534 }
1535
1536 blk = blk_by_name(device);
1537 if (!blk) {
1538 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1539 "Device '%s' not found", device);
1540 return;
1541 }
1542
1543 /* AioContext is released in .clean() */
1544 state->aio_context = blk_get_aio_context(blk);
1545 aio_context_acquire(state->aio_context);
1546
1547 if (!blk_is_available(blk)) {
1548 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1549 return;
1550 }
1551 bs = blk_bs(blk);
1552
1553 state->bs = bs;
1554 bdrv_drained_begin(bs);
1555
1556 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1557 return;
1558 }
1559
1560 if (bdrv_is_read_only(bs)) {
1561 error_setg(errp, "Device '%s' is read only", device);
1562 return;
1563 }
1564
1565 if (!bdrv_can_snapshot(bs)) {
1566 error_setg(errp, "Block format '%s' used by device '%s' "
1567 "does not support internal snapshots",
1568 bs->drv->format_name, device);
1569 return;
1570 }
1571
1572 if (!strlen(name)) {
1573 error_setg(errp, "Name is empty");
1574 return;
1575 }
1576
1577 /* check whether a snapshot with name exist */
1578 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1579 &local_err);
1580 if (local_err) {
1581 error_propagate(errp, local_err);
1582 return;
1583 } else if (ret) {
1584 error_setg(errp,
1585 "Snapshot with name '%s' already exists on device '%s'",
1586 name, device);
1587 return;
1588 }
1589
1590 /* 3. take the snapshot */
1591 sn = &state->sn;
1592 pstrcpy(sn->name, sizeof(sn->name), name);
1593 qemu_gettimeofday(&tv);
1594 sn->date_sec = tv.tv_sec;
1595 sn->date_nsec = tv.tv_usec * 1000;
1596 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1597
1598 ret1 = bdrv_snapshot_create(bs, sn);
1599 if (ret1 < 0) {
1600 error_setg_errno(errp, -ret1,
1601 "Failed to create snapshot '%s' on device '%s'",
1602 name, device);
1603 return;
1604 }
1605
1606 /* 4. succeed, mark a snapshot is created */
1607 state->created = true;
1608 }
1609
1610 static void internal_snapshot_abort(BlkActionState *common)
1611 {
1612 InternalSnapshotState *state =
1613 DO_UPCAST(InternalSnapshotState, common, common);
1614 BlockDriverState *bs = state->bs;
1615 QEMUSnapshotInfo *sn = &state->sn;
1616 Error *local_error = NULL;
1617
1618 if (!state->created) {
1619 return;
1620 }
1621
1622 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1623 error_reportf_err(local_error,
1624 "Failed to delete snapshot with id '%s' and "
1625 "name '%s' on device '%s' in abort: ",
1626 sn->id_str, sn->name,
1627 bdrv_get_device_name(bs));
1628 }
1629 }
1630
1631 static void internal_snapshot_clean(BlkActionState *common)
1632 {
1633 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1634 common, common);
1635
1636 if (state->aio_context) {
1637 if (state->bs) {
1638 bdrv_drained_end(state->bs);
1639 }
1640 aio_context_release(state->aio_context);
1641 }
1642 }
1643
1644 /* external snapshot private data */
1645 typedef struct ExternalSnapshotState {
1646 BlkActionState common;
1647 BlockDriverState *old_bs;
1648 BlockDriverState *new_bs;
1649 AioContext *aio_context;
1650 } ExternalSnapshotState;
1651
1652 static void external_snapshot_prepare(BlkActionState *common,
1653 Error **errp)
1654 {
1655 int flags = 0, ret;
1656 QDict *options = NULL;
1657 Error *local_err = NULL;
1658 /* Device and node name of the image to generate the snapshot from */
1659 const char *device;
1660 const char *node_name;
1661 /* Reference to the new image (for 'blockdev-snapshot') */
1662 const char *snapshot_ref;
1663 /* File name of the new image (for 'blockdev-snapshot-sync') */
1664 const char *new_image_file;
1665 ExternalSnapshotState *state =
1666 DO_UPCAST(ExternalSnapshotState, common, common);
1667 TransactionAction *action = common->action;
1668
1669 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1670 * purpose but a different set of parameters */
1671 switch (action->type) {
1672 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1673 {
1674 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1675 device = s->node;
1676 node_name = s->node;
1677 new_image_file = NULL;
1678 snapshot_ref = s->overlay;
1679 }
1680 break;
1681 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1682 {
1683 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1684 device = s->has_device ? s->device : NULL;
1685 node_name = s->has_node_name ? s->node_name : NULL;
1686 new_image_file = s->snapshot_file;
1687 snapshot_ref = NULL;
1688 }
1689 break;
1690 default:
1691 g_assert_not_reached();
1692 }
1693
1694 /* start processing */
1695 if (action_check_completion_mode(common, errp) < 0) {
1696 return;
1697 }
1698
1699 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1700 if (!state->old_bs) {
1701 return;
1702 }
1703
1704 /* Acquire AioContext now so any threads operating on old_bs stop */
1705 state->aio_context = bdrv_get_aio_context(state->old_bs);
1706 aio_context_acquire(state->aio_context);
1707 bdrv_drained_begin(state->old_bs);
1708
1709 if (!bdrv_is_inserted(state->old_bs)) {
1710 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1711 return;
1712 }
1713
1714 if (bdrv_op_is_blocked(state->old_bs,
1715 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1716 return;
1717 }
1718
1719 if (!bdrv_is_read_only(state->old_bs)) {
1720 if (bdrv_flush(state->old_bs)) {
1721 error_setg(errp, QERR_IO_ERROR);
1722 return;
1723 }
1724 }
1725
1726 if (!bdrv_is_first_non_filter(state->old_bs)) {
1727 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1728 return;
1729 }
1730
1731 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1732 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1733 const char *format = s->has_format ? s->format : "qcow2";
1734 enum NewImageMode mode;
1735 const char *snapshot_node_name =
1736 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1737
1738 if (node_name && !snapshot_node_name) {
1739 error_setg(errp, "New snapshot node name missing");
1740 return;
1741 }
1742
1743 if (snapshot_node_name &&
1744 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1745 error_setg(errp, "New snapshot node name already in use");
1746 return;
1747 }
1748
1749 flags = state->old_bs->open_flags;
1750 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ);
1751
1752 /* create new image w/backing file */
1753 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1754 if (mode != NEW_IMAGE_MODE_EXISTING) {
1755 int64_t size = bdrv_getlength(state->old_bs);
1756 if (size < 0) {
1757 error_setg_errno(errp, -size, "bdrv_getlength failed");
1758 return;
1759 }
1760 bdrv_img_create(new_image_file, format,
1761 state->old_bs->filename,
1762 state->old_bs->drv->format_name,
1763 NULL, size, flags, &local_err, false);
1764 if (local_err) {
1765 error_propagate(errp, local_err);
1766 return;
1767 }
1768 }
1769
1770 options = qdict_new();
1771 if (s->has_snapshot_node_name) {
1772 qdict_put(options, "node-name",
1773 qstring_from_str(snapshot_node_name));
1774 }
1775 qdict_put(options, "driver", qstring_from_str(format));
1776
1777 flags |= BDRV_O_NO_BACKING;
1778 }
1779
1780 assert(state->new_bs == NULL);
1781 ret = bdrv_open(&state->new_bs, new_image_file, snapshot_ref, options,
1782 flags, errp);
1783 /* We will manually add the backing_hd field to the bs later */
1784 if (ret != 0) {
1785 return;
1786 }
1787
1788 if (state->new_bs->blk != NULL) {
1789 error_setg(errp, "The snapshot is already in use by %s",
1790 blk_name(state->new_bs->blk));
1791 return;
1792 }
1793
1794 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1795 errp)) {
1796 return;
1797 }
1798
1799 if (state->new_bs->backing != NULL) {
1800 error_setg(errp, "The snapshot already has a backing image");
1801 return;
1802 }
1803
1804 if (!state->new_bs->drv->supports_backing) {
1805 error_setg(errp, "The snapshot does not support backing images");
1806 }
1807 }
1808
1809 static void external_snapshot_commit(BlkActionState *common)
1810 {
1811 ExternalSnapshotState *state =
1812 DO_UPCAST(ExternalSnapshotState, common, common);
1813
1814 bdrv_set_aio_context(state->new_bs, state->aio_context);
1815
1816 /* This removes our old bs and adds the new bs */
1817 bdrv_append(state->new_bs, state->old_bs);
1818 /* We don't need (or want) to use the transactional
1819 * bdrv_reopen_multiple() across all the entries at once, because we
1820 * don't want to abort all of them if one of them fails the reopen */
1821 if (!state->old_bs->copy_on_read) {
1822 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1823 NULL);
1824 }
1825 }
1826
1827 static void external_snapshot_abort(BlkActionState *common)
1828 {
1829 ExternalSnapshotState *state =
1830 DO_UPCAST(ExternalSnapshotState, common, common);
1831 if (state->new_bs) {
1832 bdrv_unref(state->new_bs);
1833 }
1834 }
1835
1836 static void external_snapshot_clean(BlkActionState *common)
1837 {
1838 ExternalSnapshotState *state =
1839 DO_UPCAST(ExternalSnapshotState, common, common);
1840 if (state->aio_context) {
1841 bdrv_drained_end(state->old_bs);
1842 aio_context_release(state->aio_context);
1843 }
1844 }
1845
1846 typedef struct DriveBackupState {
1847 BlkActionState common;
1848 BlockDriverState *bs;
1849 AioContext *aio_context;
1850 BlockJob *job;
1851 } DriveBackupState;
1852
1853 static void do_drive_backup(const char *device, const char *target,
1854 bool has_format, const char *format,
1855 enum MirrorSyncMode sync,
1856 bool has_mode, enum NewImageMode mode,
1857 bool has_speed, int64_t speed,
1858 bool has_bitmap, const char *bitmap,
1859 bool has_on_source_error,
1860 BlockdevOnError on_source_error,
1861 bool has_on_target_error,
1862 BlockdevOnError on_target_error,
1863 BlockJobTxn *txn, Error **errp);
1864
1865 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1866 {
1867 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1868 BlockBackend *blk;
1869 DriveBackup *backup;
1870 Error *local_err = NULL;
1871
1872 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1873 backup = common->action->u.drive_backup.data;
1874
1875 blk = blk_by_name(backup->device);
1876 if (!blk) {
1877 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1878 "Device '%s' not found", backup->device);
1879 return;
1880 }
1881
1882 if (!blk_is_available(blk)) {
1883 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1884 return;
1885 }
1886
1887 /* AioContext is released in .clean() */
1888 state->aio_context = blk_get_aio_context(blk);
1889 aio_context_acquire(state->aio_context);
1890 bdrv_drained_begin(blk_bs(blk));
1891 state->bs = blk_bs(blk);
1892
1893 do_drive_backup(backup->device, backup->target,
1894 backup->has_format, backup->format,
1895 backup->sync,
1896 backup->has_mode, backup->mode,
1897 backup->has_speed, backup->speed,
1898 backup->has_bitmap, backup->bitmap,
1899 backup->has_on_source_error, backup->on_source_error,
1900 backup->has_on_target_error, backup->on_target_error,
1901 common->block_job_txn, &local_err);
1902 if (local_err) {
1903 error_propagate(errp, local_err);
1904 return;
1905 }
1906
1907 state->job = state->bs->job;
1908 }
1909
1910 static void drive_backup_abort(BlkActionState *common)
1911 {
1912 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1913 BlockDriverState *bs = state->bs;
1914
1915 /* Only cancel if it's the job we started */
1916 if (bs && bs->job && bs->job == state->job) {
1917 block_job_cancel_sync(bs->job);
1918 }
1919 }
1920
1921 static void drive_backup_clean(BlkActionState *common)
1922 {
1923 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1924
1925 if (state->aio_context) {
1926 bdrv_drained_end(state->bs);
1927 aio_context_release(state->aio_context);
1928 }
1929 }
1930
1931 typedef struct BlockdevBackupState {
1932 BlkActionState common;
1933 BlockDriverState *bs;
1934 BlockJob *job;
1935 AioContext *aio_context;
1936 } BlockdevBackupState;
1937
1938 static void do_blockdev_backup(const char *device, const char *target,
1939 enum MirrorSyncMode sync,
1940 bool has_speed, int64_t speed,
1941 bool has_on_source_error,
1942 BlockdevOnError on_source_error,
1943 bool has_on_target_error,
1944 BlockdevOnError on_target_error,
1945 BlockJobTxn *txn, Error **errp);
1946
1947 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1948 {
1949 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1950 BlockdevBackup *backup;
1951 BlockBackend *blk, *target;
1952 Error *local_err = NULL;
1953
1954 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1955 backup = common->action->u.blockdev_backup.data;
1956
1957 blk = blk_by_name(backup->device);
1958 if (!blk) {
1959 error_setg(errp, "Device '%s' not found", backup->device);
1960 return;
1961 }
1962
1963 if (!blk_is_available(blk)) {
1964 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1965 return;
1966 }
1967
1968 target = blk_by_name(backup->target);
1969 if (!target) {
1970 error_setg(errp, "Device '%s' not found", backup->target);
1971 return;
1972 }
1973
1974 /* AioContext is released in .clean() */
1975 state->aio_context = blk_get_aio_context(blk);
1976 if (state->aio_context != blk_get_aio_context(target)) {
1977 state->aio_context = NULL;
1978 error_setg(errp, "Backup between two IO threads is not implemented");
1979 return;
1980 }
1981 aio_context_acquire(state->aio_context);
1982 state->bs = blk_bs(blk);
1983 bdrv_drained_begin(state->bs);
1984
1985 do_blockdev_backup(backup->device, backup->target,
1986 backup->sync,
1987 backup->has_speed, backup->speed,
1988 backup->has_on_source_error, backup->on_source_error,
1989 backup->has_on_target_error, backup->on_target_error,
1990 common->block_job_txn, &local_err);
1991 if (local_err) {
1992 error_propagate(errp, local_err);
1993 return;
1994 }
1995
1996 state->job = state->bs->job;
1997 }
1998
1999 static void blockdev_backup_abort(BlkActionState *common)
2000 {
2001 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2002 BlockDriverState *bs = state->bs;
2003
2004 /* Only cancel if it's the job we started */
2005 if (bs && bs->job && bs->job == state->job) {
2006 block_job_cancel_sync(bs->job);
2007 }
2008 }
2009
2010 static void blockdev_backup_clean(BlkActionState *common)
2011 {
2012 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2013
2014 if (state->aio_context) {
2015 bdrv_drained_end(state->bs);
2016 aio_context_release(state->aio_context);
2017 }
2018 }
2019
2020 typedef struct BlockDirtyBitmapState {
2021 BlkActionState common;
2022 BdrvDirtyBitmap *bitmap;
2023 BlockDriverState *bs;
2024 AioContext *aio_context;
2025 HBitmap *backup;
2026 bool prepared;
2027 } BlockDirtyBitmapState;
2028
2029 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2030 Error **errp)
2031 {
2032 Error *local_err = NULL;
2033 BlockDirtyBitmapAdd *action;
2034 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2035 common, common);
2036
2037 if (action_check_completion_mode(common, errp) < 0) {
2038 return;
2039 }
2040
2041 action = common->action->u.block_dirty_bitmap_add.data;
2042 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2043 qmp_block_dirty_bitmap_add(action->node, action->name,
2044 action->has_granularity, action->granularity,
2045 &local_err);
2046
2047 if (!local_err) {
2048 state->prepared = true;
2049 } else {
2050 error_propagate(errp, local_err);
2051 }
2052 }
2053
2054 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2055 {
2056 BlockDirtyBitmapAdd *action;
2057 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2058 common, common);
2059
2060 action = common->action->u.block_dirty_bitmap_add.data;
2061 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2062 * then the node reference and bitmap name must have been valid.
2063 */
2064 if (state->prepared) {
2065 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2066 }
2067 }
2068
2069 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2070 Error **errp)
2071 {
2072 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2073 common, common);
2074 BlockDirtyBitmap *action;
2075
2076 if (action_check_completion_mode(common, errp) < 0) {
2077 return;
2078 }
2079
2080 action = common->action->u.block_dirty_bitmap_clear.data;
2081 state->bitmap = block_dirty_bitmap_lookup(action->node,
2082 action->name,
2083 &state->bs,
2084 &state->aio_context,
2085 errp);
2086 if (!state->bitmap) {
2087 return;
2088 }
2089
2090 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2091 error_setg(errp, "Cannot modify a frozen bitmap");
2092 return;
2093 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2094 error_setg(errp, "Cannot clear a disabled bitmap");
2095 return;
2096 }
2097
2098 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2099 /* AioContext is released in .clean() */
2100 }
2101
2102 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2103 {
2104 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2105 common, common);
2106
2107 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2108 }
2109
2110 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2111 {
2112 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2113 common, common);
2114
2115 hbitmap_free(state->backup);
2116 }
2117
2118 static void block_dirty_bitmap_clear_clean(BlkActionState *common)
2119 {
2120 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2121 common, common);
2122
2123 if (state->aio_context) {
2124 aio_context_release(state->aio_context);
2125 }
2126 }
2127
2128 static void abort_prepare(BlkActionState *common, Error **errp)
2129 {
2130 error_setg(errp, "Transaction aborted using Abort action");
2131 }
2132
2133 static void abort_commit(BlkActionState *common)
2134 {
2135 g_assert_not_reached(); /* this action never succeeds */
2136 }
2137
2138 static const BlkActionOps actions[] = {
2139 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2140 .instance_size = sizeof(ExternalSnapshotState),
2141 .prepare = external_snapshot_prepare,
2142 .commit = external_snapshot_commit,
2143 .abort = external_snapshot_abort,
2144 .clean = external_snapshot_clean,
2145 },
2146 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2147 .instance_size = sizeof(ExternalSnapshotState),
2148 .prepare = external_snapshot_prepare,
2149 .commit = external_snapshot_commit,
2150 .abort = external_snapshot_abort,
2151 .clean = external_snapshot_clean,
2152 },
2153 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2154 .instance_size = sizeof(DriveBackupState),
2155 .prepare = drive_backup_prepare,
2156 .abort = drive_backup_abort,
2157 .clean = drive_backup_clean,
2158 },
2159 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2160 .instance_size = sizeof(BlockdevBackupState),
2161 .prepare = blockdev_backup_prepare,
2162 .abort = blockdev_backup_abort,
2163 .clean = blockdev_backup_clean,
2164 },
2165 [TRANSACTION_ACTION_KIND_ABORT] = {
2166 .instance_size = sizeof(BlkActionState),
2167 .prepare = abort_prepare,
2168 .commit = abort_commit,
2169 },
2170 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2171 .instance_size = sizeof(InternalSnapshotState),
2172 .prepare = internal_snapshot_prepare,
2173 .abort = internal_snapshot_abort,
2174 .clean = internal_snapshot_clean,
2175 },
2176 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2177 .instance_size = sizeof(BlockDirtyBitmapState),
2178 .prepare = block_dirty_bitmap_add_prepare,
2179 .abort = block_dirty_bitmap_add_abort,
2180 },
2181 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2182 .instance_size = sizeof(BlockDirtyBitmapState),
2183 .prepare = block_dirty_bitmap_clear_prepare,
2184 .commit = block_dirty_bitmap_clear_commit,
2185 .abort = block_dirty_bitmap_clear_abort,
2186 .clean = block_dirty_bitmap_clear_clean,
2187 }
2188 };
2189
2190 /**
2191 * Allocate a TransactionProperties structure if necessary, and fill
2192 * that structure with desired defaults if they are unset.
2193 */
2194 static TransactionProperties *get_transaction_properties(
2195 TransactionProperties *props)
2196 {
2197 if (!props) {
2198 props = g_new0(TransactionProperties, 1);
2199 }
2200
2201 if (!props->has_completion_mode) {
2202 props->has_completion_mode = true;
2203 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2204 }
2205
2206 return props;
2207 }
2208
2209 /*
2210 * 'Atomic' group operations. The operations are performed as a set, and if
2211 * any fail then we roll back all operations in the group.
2212 */
2213 void qmp_transaction(TransactionActionList *dev_list,
2214 bool has_props,
2215 struct TransactionProperties *props,
2216 Error **errp)
2217 {
2218 TransactionActionList *dev_entry = dev_list;
2219 BlockJobTxn *block_job_txn = NULL;
2220 BlkActionState *state, *next;
2221 Error *local_err = NULL;
2222
2223 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2224 QSIMPLEQ_INIT(&snap_bdrv_states);
2225
2226 /* Does this transaction get canceled as a group on failure?
2227 * If not, we don't really need to make a BlockJobTxn.
2228 */
2229 props = get_transaction_properties(props);
2230 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2231 block_job_txn = block_job_txn_new();
2232 }
2233
2234 /* drain all i/o before any operations */
2235 bdrv_drain_all();
2236
2237 /* We don't do anything in this loop that commits us to the operations */
2238 while (NULL != dev_entry) {
2239 TransactionAction *dev_info = NULL;
2240 const BlkActionOps *ops;
2241
2242 dev_info = dev_entry->value;
2243 dev_entry = dev_entry->next;
2244
2245 assert(dev_info->type < ARRAY_SIZE(actions));
2246
2247 ops = &actions[dev_info->type];
2248 assert(ops->instance_size > 0);
2249
2250 state = g_malloc0(ops->instance_size);
2251 state->ops = ops;
2252 state->action = dev_info;
2253 state->block_job_txn = block_job_txn;
2254 state->txn_props = props;
2255 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2256
2257 state->ops->prepare(state, &local_err);
2258 if (local_err) {
2259 error_propagate(errp, local_err);
2260 goto delete_and_fail;
2261 }
2262 }
2263
2264 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2265 if (state->ops->commit) {
2266 state->ops->commit(state);
2267 }
2268 }
2269
2270 /* success */
2271 goto exit;
2272
2273 delete_and_fail:
2274 /* failure, and it is all-or-none; roll back all operations */
2275 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2276 if (state->ops->abort) {
2277 state->ops->abort(state);
2278 }
2279 }
2280 exit:
2281 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2282 if (state->ops->clean) {
2283 state->ops->clean(state);
2284 }
2285 g_free(state);
2286 }
2287 if (!has_props) {
2288 qapi_free_TransactionProperties(props);
2289 }
2290 block_job_txn_unref(block_job_txn);
2291 }
2292
2293 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
2294 {
2295 Error *local_err = NULL;
2296
2297 qmp_blockdev_open_tray(device, has_force, force, &local_err);
2298 if (local_err) {
2299 error_propagate(errp, local_err);
2300 return;
2301 }
2302
2303 qmp_x_blockdev_remove_medium(device, errp);
2304 }
2305
2306 void qmp_block_passwd(bool has_device, const char *device,
2307 bool has_node_name, const char *node_name,
2308 const char *password, Error **errp)
2309 {
2310 Error *local_err = NULL;
2311 BlockDriverState *bs;
2312 AioContext *aio_context;
2313
2314 bs = bdrv_lookup_bs(has_device ? device : NULL,
2315 has_node_name ? node_name : NULL,
2316 &local_err);
2317 if (local_err) {
2318 error_propagate(errp, local_err);
2319 return;
2320 }
2321
2322 aio_context = bdrv_get_aio_context(bs);
2323 aio_context_acquire(aio_context);
2324
2325 bdrv_add_key(bs, password, errp);
2326
2327 aio_context_release(aio_context);
2328 }
2329
2330 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force,
2331 Error **errp)
2332 {
2333 BlockBackend *blk;
2334 bool locked;
2335
2336 if (!has_force) {
2337 force = false;
2338 }
2339
2340 blk = blk_by_name(device);
2341 if (!blk) {
2342 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2343 "Device '%s' not found", device);
2344 return;
2345 }
2346
2347 if (!blk_dev_has_removable_media(blk)) {
2348 error_setg(errp, "Device '%s' is not removable", device);
2349 return;
2350 }
2351
2352 if (!blk_dev_has_tray(blk)) {
2353 /* Ignore this command on tray-less devices */
2354 return;
2355 }
2356
2357 if (blk_dev_is_tray_open(blk)) {
2358 return;
2359 }
2360
2361 locked = blk_dev_is_medium_locked(blk);
2362 if (locked) {
2363 blk_dev_eject_request(blk, force);
2364 }
2365
2366 if (!locked || force) {
2367 blk_dev_change_media_cb(blk, false);
2368 }
2369 }
2370
2371 void qmp_blockdev_close_tray(const char *device, Error **errp)
2372 {
2373 BlockBackend *blk;
2374
2375 blk = blk_by_name(device);
2376 if (!blk) {
2377 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2378 "Device '%s' not found", device);
2379 return;
2380 }
2381
2382 if (!blk_dev_has_removable_media(blk)) {
2383 error_setg(errp, "Device '%s' is not removable", device);
2384 return;
2385 }
2386
2387 if (!blk_dev_has_tray(blk)) {
2388 /* Ignore this command on tray-less devices */
2389 return;
2390 }
2391
2392 if (!blk_dev_is_tray_open(blk)) {
2393 return;
2394 }
2395
2396 blk_dev_change_media_cb(blk, true);
2397 }
2398
2399 void qmp_x_blockdev_remove_medium(const char *device, Error **errp)
2400 {
2401 BlockBackend *blk;
2402 BlockDriverState *bs;
2403 AioContext *aio_context;
2404 bool has_device;
2405
2406 blk = blk_by_name(device);
2407 if (!blk) {
2408 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2409 "Device '%s' not found", device);
2410 return;
2411 }
2412
2413 /* For BBs without a device, we can exchange the BDS tree at will */
2414 has_device = blk_get_attached_dev(blk);
2415
2416 if (has_device && !blk_dev_has_removable_media(blk)) {
2417 error_setg(errp, "Device '%s' is not removable", device);
2418 return;
2419 }
2420
2421 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2422 error_setg(errp, "Tray of device '%s' is not open", device);
2423 return;
2424 }
2425
2426 bs = blk_bs(blk);
2427 if (!bs) {
2428 return;
2429 }
2430
2431 aio_context = bdrv_get_aio_context(bs);
2432 aio_context_acquire(aio_context);
2433
2434 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2435 goto out;
2436 }
2437
2438 blk_remove_bs(blk);
2439
2440 if (!blk_dev_has_tray(blk)) {
2441 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2442 * called at all); therefore, the medium needs to be ejected here.
2443 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2444 * value passed here (i.e. false). */
2445 blk_dev_change_media_cb(blk, false);
2446 }
2447
2448 out:
2449 aio_context_release(aio_context);
2450 }
2451
2452 static void qmp_blockdev_insert_anon_medium(const char *device,
2453 BlockDriverState *bs, Error **errp)
2454 {
2455 BlockBackend *blk;
2456 bool has_device;
2457
2458 blk = blk_by_name(device);
2459 if (!blk) {
2460 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2461 "Device '%s' not found", device);
2462 return;
2463 }
2464
2465 /* For BBs without a device, we can exchange the BDS tree at will */
2466 has_device = blk_get_attached_dev(blk);
2467
2468 if (has_device && !blk_dev_has_removable_media(blk)) {
2469 error_setg(errp, "Device '%s' is not removable", device);
2470 return;
2471 }
2472
2473 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2474 error_setg(errp, "Tray of device '%s' is not open", device);
2475 return;
2476 }
2477
2478 if (blk_bs(blk)) {
2479 error_setg(errp, "There already is a medium in device '%s'", device);
2480 return;
2481 }
2482
2483 blk_insert_bs(blk, bs);
2484
2485 if (!blk_dev_has_tray(blk)) {
2486 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2487 * called at all); therefore, the medium needs to be pushed into the
2488 * slot here.
2489 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2490 * value passed here (i.e. true). */
2491 blk_dev_change_media_cb(blk, true);
2492 }
2493 }
2494
2495 void qmp_x_blockdev_insert_medium(const char *device, const char *node_name,
2496 Error **errp)
2497 {
2498 BlockDriverState *bs;
2499
2500 bs = bdrv_find_node(node_name);
2501 if (!bs) {
2502 error_setg(errp, "Node '%s' not found", node_name);
2503 return;
2504 }
2505
2506 if (bs->blk) {
2507 error_setg(errp, "Node '%s' is already in use by '%s'", node_name,
2508 blk_name(bs->blk));
2509 return;
2510 }
2511
2512 qmp_blockdev_insert_anon_medium(device, bs, errp);
2513 }
2514
2515 void qmp_blockdev_change_medium(const char *device, const char *filename,
2516 bool has_format, const char *format,
2517 bool has_read_only,
2518 BlockdevChangeReadOnlyMode read_only,
2519 Error **errp)
2520 {
2521 BlockBackend *blk;
2522 BlockDriverState *medium_bs = NULL;
2523 int bdrv_flags, ret;
2524 QDict *options = NULL;
2525 Error *err = NULL;
2526
2527 blk = blk_by_name(device);
2528 if (!blk) {
2529 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2530 "Device '%s' not found", device);
2531 goto fail;
2532 }
2533
2534 if (blk_bs(blk)) {
2535 blk_update_root_state(blk);
2536 }
2537
2538 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2539 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2540 BDRV_O_PROTOCOL);
2541
2542 if (!has_read_only) {
2543 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2544 }
2545
2546 switch (read_only) {
2547 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2548 break;
2549
2550 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2551 bdrv_flags &= ~BDRV_O_RDWR;
2552 break;
2553
2554 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2555 bdrv_flags |= BDRV_O_RDWR;
2556 break;
2557
2558 default:
2559 abort();
2560 }
2561
2562 if (has_format) {
2563 options = qdict_new();
2564 qdict_put(options, "driver", qstring_from_str(format));
2565 }
2566
2567 assert(!medium_bs);
2568 ret = bdrv_open(&medium_bs, filename, NULL, options, bdrv_flags, errp);
2569 if (ret < 0) {
2570 goto fail;
2571 }
2572
2573 blk_apply_root_state(blk, medium_bs);
2574
2575 bdrv_add_key(medium_bs, NULL, &err);
2576 if (err) {
2577 error_propagate(errp, err);
2578 goto fail;
2579 }
2580
2581 qmp_blockdev_open_tray(device, false, false, &err);
2582 if (err) {
2583 error_propagate(errp, err);
2584 goto fail;
2585 }
2586
2587 qmp_x_blockdev_remove_medium(device, &err);
2588 if (err) {
2589 error_propagate(errp, err);
2590 goto fail;
2591 }
2592
2593 qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
2594 if (err) {
2595 error_propagate(errp, err);
2596 goto fail;
2597 }
2598
2599 qmp_blockdev_close_tray(device, errp);
2600
2601 fail:
2602 /* If the medium has been inserted, the device has its own reference, so
2603 * ours must be relinquished; and if it has not been inserted successfully,
2604 * the reference must be relinquished anyway */
2605 bdrv_unref(medium_bs);
2606 }
2607
2608 /* throttling disk I/O limits */
2609 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2610 int64_t bps_wr,
2611 int64_t iops,
2612 int64_t iops_rd,
2613 int64_t iops_wr,
2614 bool has_bps_max,
2615 int64_t bps_max,
2616 bool has_bps_rd_max,
2617 int64_t bps_rd_max,
2618 bool has_bps_wr_max,
2619 int64_t bps_wr_max,
2620 bool has_iops_max,
2621 int64_t iops_max,
2622 bool has_iops_rd_max,
2623 int64_t iops_rd_max,
2624 bool has_iops_wr_max,
2625 int64_t iops_wr_max,
2626 bool has_bps_max_length,
2627 int64_t bps_max_length,
2628 bool has_bps_rd_max_length,
2629 int64_t bps_rd_max_length,
2630 bool has_bps_wr_max_length,
2631 int64_t bps_wr_max_length,
2632 bool has_iops_max_length,
2633 int64_t iops_max_length,
2634 bool has_iops_rd_max_length,
2635 int64_t iops_rd_max_length,
2636 bool has_iops_wr_max_length,
2637 int64_t iops_wr_max_length,
2638 bool has_iops_size,
2639 int64_t iops_size,
2640 bool has_group,
2641 const char *group, Error **errp)
2642 {
2643 ThrottleConfig cfg;
2644 BlockDriverState *bs;
2645 BlockBackend *blk;
2646 AioContext *aio_context;
2647
2648 blk = blk_by_name(device);
2649 if (!blk) {
2650 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2651 "Device '%s' not found", device);
2652 return;
2653 }
2654
2655 aio_context = blk_get_aio_context(blk);
2656 aio_context_acquire(aio_context);
2657
2658 bs = blk_bs(blk);
2659 if (!bs) {
2660 error_setg(errp, "Device '%s' has no medium", device);
2661 goto out;
2662 }
2663
2664 /* The BlockBackend must be the only parent */
2665 assert(QLIST_FIRST(&bs->parents));
2666 if (QLIST_NEXT(QLIST_FIRST(&bs->parents), next_parent)) {
2667 error_setg(errp, "Cannot throttle device with multiple parents");
2668 goto out;
2669 }
2670
2671 throttle_config_init(&cfg);
2672 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2673 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2674 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2675
2676 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2677 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2678 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2679
2680 if (has_bps_max) {
2681 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2682 }
2683 if (has_bps_rd_max) {
2684 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2685 }
2686 if (has_bps_wr_max) {
2687 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2688 }
2689 if (has_iops_max) {
2690 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2691 }
2692 if (has_iops_rd_max) {
2693 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2694 }
2695 if (has_iops_wr_max) {
2696 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2697 }
2698
2699 if (has_bps_max_length) {
2700 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = bps_max_length;
2701 }
2702 if (has_bps_rd_max_length) {
2703 cfg.buckets[THROTTLE_BPS_READ].burst_length = bps_rd_max_length;
2704 }
2705 if (has_bps_wr_max_length) {
2706 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = bps_wr_max_length;
2707 }
2708 if (has_iops_max_length) {
2709 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = iops_max_length;
2710 }
2711 if (has_iops_rd_max_length) {
2712 cfg.buckets[THROTTLE_OPS_READ].burst_length = iops_rd_max_length;
2713 }
2714 if (has_iops_wr_max_length) {
2715 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = iops_wr_max_length;
2716 }
2717
2718 if (has_iops_size) {
2719 cfg.op_size = iops_size;
2720 }
2721
2722 if (!throttle_is_valid(&cfg, errp)) {
2723 goto out;
2724 }
2725
2726 if (throttle_enabled(&cfg)) {
2727 /* Enable I/O limits if they're not enabled yet, otherwise
2728 * just update the throttling group. */
2729 if (!bs->throttle_state) {
2730 bdrv_io_limits_enable(bs, has_group ? group : device);
2731 } else if (has_group) {
2732 bdrv_io_limits_update_group(bs, group);
2733 }
2734 /* Set the new throttling configuration */
2735 bdrv_set_io_limits(bs, &cfg);
2736 } else if (bs->throttle_state) {
2737 /* If all throttling settings are set to 0, disable I/O limits */
2738 bdrv_io_limits_disable(bs);
2739 }
2740
2741 out:
2742 aio_context_release(aio_context);
2743 }
2744
2745 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2746 bool has_granularity, uint32_t granularity,
2747 Error **errp)
2748 {
2749 AioContext *aio_context;
2750 BlockDriverState *bs;
2751
2752 if (!name || name[0] == '\0') {
2753 error_setg(errp, "Bitmap name cannot be empty");
2754 return;
2755 }
2756
2757 bs = bdrv_lookup_bs(node, node, errp);
2758 if (!bs) {
2759 return;
2760 }
2761
2762 aio_context = bdrv_get_aio_context(bs);
2763 aio_context_acquire(aio_context);
2764
2765 if (has_granularity) {
2766 if (granularity < 512 || !is_power_of_2(granularity)) {
2767 error_setg(errp, "Granularity must be power of 2 "
2768 "and at least 512");
2769 goto out;
2770 }
2771 } else {
2772 /* Default to cluster size, if available: */
2773 granularity = bdrv_get_default_bitmap_granularity(bs);
2774 }
2775
2776 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2777
2778 out:
2779 aio_context_release(aio_context);
2780 }
2781
2782 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2783 Error **errp)
2784 {
2785 AioContext *aio_context;
2786 BlockDriverState *bs;
2787 BdrvDirtyBitmap *bitmap;
2788
2789 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2790 if (!bitmap || !bs) {
2791 return;
2792 }
2793
2794 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2795 error_setg(errp,
2796 "Bitmap '%s' is currently frozen and cannot be removed",
2797 name);
2798 goto out;
2799 }
2800 bdrv_dirty_bitmap_make_anon(bitmap);
2801 bdrv_release_dirty_bitmap(bs, bitmap);
2802
2803 out:
2804 aio_context_release(aio_context);
2805 }
2806
2807 /**
2808 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2809 * immediately after a full backup operation.
2810 */
2811 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2812 Error **errp)
2813 {
2814 AioContext *aio_context;
2815 BdrvDirtyBitmap *bitmap;
2816 BlockDriverState *bs;
2817
2818 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2819 if (!bitmap || !bs) {
2820 return;
2821 }
2822
2823 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2824 error_setg(errp,
2825 "Bitmap '%s' is currently frozen and cannot be modified",
2826 name);
2827 goto out;
2828 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2829 error_setg(errp,
2830 "Bitmap '%s' is currently disabled and cannot be cleared",
2831 name);
2832 goto out;
2833 }
2834
2835 bdrv_clear_dirty_bitmap(bitmap, NULL);
2836
2837 out:
2838 aio_context_release(aio_context);
2839 }
2840
2841 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2842 {
2843 const char *id = qdict_get_str(qdict, "id");
2844 BlockBackend *blk;
2845 BlockDriverState *bs;
2846 AioContext *aio_context;
2847 Error *local_err = NULL;
2848
2849 bs = bdrv_find_node(id);
2850 if (bs) {
2851 qmp_x_blockdev_del(false, NULL, true, id, &local_err);
2852 if (local_err) {
2853 error_report_err(local_err);
2854 }
2855 return;
2856 }
2857
2858 blk = blk_by_name(id);
2859 if (!blk) {
2860 error_report("Device '%s' not found", id);
2861 return;
2862 }
2863
2864 if (!blk_legacy_dinfo(blk)) {
2865 error_report("Deleting device added with blockdev-add"
2866 " is not supported");
2867 return;
2868 }
2869
2870 aio_context = blk_get_aio_context(blk);
2871 aio_context_acquire(aio_context);
2872
2873 bs = blk_bs(blk);
2874 if (bs) {
2875 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2876 error_report_err(local_err);
2877 aio_context_release(aio_context);
2878 return;
2879 }
2880
2881 blk_remove_bs(blk);
2882 }
2883
2884 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2885 monitor_remove_blk(blk);
2886
2887 /* If this BlockBackend has a device attached to it, its refcount will be
2888 * decremented when the device is removed; otherwise we have to do so here.
2889 */
2890 if (blk_get_attached_dev(blk)) {
2891 /* Further I/O must not pause the guest */
2892 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2893 BLOCKDEV_ON_ERROR_REPORT);
2894 } else {
2895 blk_unref(blk);
2896 }
2897
2898 aio_context_release(aio_context);
2899 }
2900
2901 void qmp_block_resize(bool has_device, const char *device,
2902 bool has_node_name, const char *node_name,
2903 int64_t size, Error **errp)
2904 {
2905 Error *local_err = NULL;
2906 BlockDriverState *bs;
2907 AioContext *aio_context;
2908 int ret;
2909
2910 bs = bdrv_lookup_bs(has_device ? device : NULL,
2911 has_node_name ? node_name : NULL,
2912 &local_err);
2913 if (local_err) {
2914 error_propagate(errp, local_err);
2915 return;
2916 }
2917
2918 aio_context = bdrv_get_aio_context(bs);
2919 aio_context_acquire(aio_context);
2920
2921 if (!bdrv_is_first_non_filter(bs)) {
2922 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2923 goto out;
2924 }
2925
2926 if (size < 0) {
2927 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2928 goto out;
2929 }
2930
2931 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2932 error_setg(errp, QERR_DEVICE_IN_USE, device);
2933 goto out;
2934 }
2935
2936 /* complete all in-flight operations before resizing the device */
2937 bdrv_drain_all();
2938
2939 ret = bdrv_truncate(bs, size);
2940 switch (ret) {
2941 case 0:
2942 break;
2943 case -ENOMEDIUM:
2944 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2945 break;
2946 case -ENOTSUP:
2947 error_setg(errp, QERR_UNSUPPORTED);
2948 break;
2949 case -EACCES:
2950 error_setg(errp, "Device '%s' is read only", device);
2951 break;
2952 case -EBUSY:
2953 error_setg(errp, QERR_DEVICE_IN_USE, device);
2954 break;
2955 default:
2956 error_setg_errno(errp, -ret, "Could not resize");
2957 break;
2958 }
2959
2960 out:
2961 aio_context_release(aio_context);
2962 }
2963
2964 static void block_job_cb(void *opaque, int ret)
2965 {
2966 /* Note that this function may be executed from another AioContext besides
2967 * the QEMU main loop. If you need to access anything that assumes the
2968 * QEMU global mutex, use a BH or introduce a mutex.
2969 */
2970
2971 BlockDriverState *bs = opaque;
2972 const char *msg = NULL;
2973
2974 trace_block_job_cb(bs, bs->job, ret);
2975
2976 assert(bs->job);
2977
2978 if (ret < 0) {
2979 msg = strerror(-ret);
2980 }
2981
2982 if (block_job_is_cancelled(bs->job)) {
2983 block_job_event_cancelled(bs->job);
2984 } else {
2985 block_job_event_completed(bs->job, msg);
2986 }
2987 }
2988
2989 void qmp_block_stream(const char *device,
2990 bool has_base, const char *base,
2991 bool has_backing_file, const char *backing_file,
2992 bool has_speed, int64_t speed,
2993 bool has_on_error, BlockdevOnError on_error,
2994 Error **errp)
2995 {
2996 BlockBackend *blk;
2997 BlockDriverState *bs;
2998 BlockDriverState *base_bs = NULL;
2999 AioContext *aio_context;
3000 Error *local_err = NULL;
3001 const char *base_name = NULL;
3002
3003 if (!has_on_error) {
3004 on_error = BLOCKDEV_ON_ERROR_REPORT;
3005 }
3006
3007 blk = blk_by_name(device);
3008 if (!blk) {
3009 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3010 "Device '%s' not found", device);
3011 return;
3012 }
3013
3014 aio_context = blk_get_aio_context(blk);
3015 aio_context_acquire(aio_context);
3016
3017 if (!blk_is_available(blk)) {
3018 error_setg(errp, "Device '%s' has no medium", device);
3019 goto out;
3020 }
3021 bs = blk_bs(blk);
3022
3023 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
3024 goto out;
3025 }
3026
3027 if (has_base) {
3028 base_bs = bdrv_find_backing_image(bs, base);
3029 if (base_bs == NULL) {
3030 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3031 goto out;
3032 }
3033 assert(bdrv_get_aio_context(base_bs) == aio_context);
3034 base_name = base;
3035 }
3036
3037 /* if we are streaming the entire chain, the result will have no backing
3038 * file, and specifying one is therefore an error */
3039 if (base_bs == NULL && has_backing_file) {
3040 error_setg(errp, "backing file specified, but streaming the "
3041 "entire chain");
3042 goto out;
3043 }
3044
3045 /* backing_file string overrides base bs filename */
3046 base_name = has_backing_file ? backing_file : base_name;
3047
3048 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
3049 on_error, block_job_cb, bs, &local_err);
3050 if (local_err) {
3051 error_propagate(errp, local_err);
3052 goto out;
3053 }
3054
3055 trace_qmp_block_stream(bs, bs->job);
3056
3057 out:
3058 aio_context_release(aio_context);
3059 }
3060
3061 void qmp_block_commit(const char *device,
3062 bool has_base, const char *base,
3063 bool has_top, const char *top,
3064 bool has_backing_file, const char *backing_file,
3065 bool has_speed, int64_t speed,
3066 Error **errp)
3067 {
3068 BlockBackend *blk;
3069 BlockDriverState *bs;
3070 BlockDriverState *base_bs, *top_bs;
3071 AioContext *aio_context;
3072 Error *local_err = NULL;
3073 /* This will be part of the QMP command, if/when the
3074 * BlockdevOnError change for blkmirror makes it in
3075 */
3076 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3077
3078 if (!has_speed) {
3079 speed = 0;
3080 }
3081
3082 /* Important Note:
3083 * libvirt relies on the DeviceNotFound error class in order to probe for
3084 * live commit feature versions; for this to work, we must make sure to
3085 * perform the device lookup before any generic errors that may occur in a
3086 * scenario in which all optional arguments are omitted. */
3087 blk = blk_by_name(device);
3088 if (!blk) {
3089 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3090 "Device '%s' not found", device);
3091 return;
3092 }
3093
3094 aio_context = blk_get_aio_context(blk);
3095 aio_context_acquire(aio_context);
3096
3097 if (!blk_is_available(blk)) {
3098 error_setg(errp, "Device '%s' has no medium", device);
3099 goto out;
3100 }
3101 bs = blk_bs(blk);
3102
3103 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3104 goto out;
3105 }
3106
3107 /* default top_bs is the active layer */
3108 top_bs = bs;
3109
3110 if (has_top && top) {
3111 if (strcmp(bs->filename, top) != 0) {
3112 top_bs = bdrv_find_backing_image(bs, top);
3113 }
3114 }
3115
3116 if (top_bs == NULL) {
3117 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3118 goto out;
3119 }
3120
3121 assert(bdrv_get_aio_context(top_bs) == aio_context);
3122
3123 if (has_base && base) {
3124 base_bs = bdrv_find_backing_image(top_bs, base);
3125 } else {
3126 base_bs = bdrv_find_base(top_bs);
3127 }
3128
3129 if (base_bs == NULL) {
3130 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3131 goto out;
3132 }
3133
3134 assert(bdrv_get_aio_context(base_bs) == aio_context);
3135
3136 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3137 goto out;
3138 }
3139
3140 /* Do not allow attempts to commit an image into itself */
3141 if (top_bs == base_bs) {
3142 error_setg(errp, "cannot commit an image into itself");
3143 goto out;
3144 }
3145
3146 if (top_bs == bs) {
3147 if (has_backing_file) {
3148 error_setg(errp, "'backing-file' specified,"
3149 " but 'top' is the active layer");
3150 goto out;
3151 }
3152 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
3153 bs, &local_err);
3154 } else {
3155 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
3156 has_backing_file ? backing_file : NULL, &local_err);
3157 }
3158 if (local_err != NULL) {
3159 error_propagate(errp, local_err);
3160 goto out;
3161 }
3162
3163 out:
3164 aio_context_release(aio_context);
3165 }
3166
3167 static void do_drive_backup(const char *device, const char *target,
3168 bool has_format, const char *format,
3169 enum MirrorSyncMode sync,
3170 bool has_mode, enum NewImageMode mode,
3171 bool has_speed, int64_t speed,
3172 bool has_bitmap, const char *bitmap,
3173 bool has_on_source_error,
3174 BlockdevOnError on_source_error,
3175 bool has_on_target_error,
3176 BlockdevOnError on_target_error,
3177 BlockJobTxn *txn, Error **errp)
3178 {
3179 BlockBackend *blk;
3180 BlockDriverState *bs;
3181 BlockDriverState *target_bs;
3182 BlockDriverState *source = NULL;
3183 BdrvDirtyBitmap *bmap = NULL;
3184 AioContext *aio_context;
3185 QDict *options = NULL;
3186 Error *local_err = NULL;
3187 int flags;
3188 int64_t size;
3189 int ret;
3190
3191 if (!has_speed) {
3192 speed = 0;
3193 }
3194 if (!has_on_source_error) {
3195 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3196 }
3197 if (!has_on_target_error) {
3198 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3199 }
3200 if (!has_mode) {
3201 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3202 }
3203
3204 blk = blk_by_name(device);
3205 if (!blk) {
3206 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3207 "Device '%s' not found", device);
3208 return;
3209 }
3210
3211 aio_context = blk_get_aio_context(blk);
3212 aio_context_acquire(aio_context);
3213
3214 /* Although backup_run has this check too, we need to use bs->drv below, so
3215 * do an early check redundantly. */
3216 if (!blk_is_available(blk)) {
3217 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3218 goto out;
3219 }
3220 bs = blk_bs(blk);
3221
3222 if (!has_format) {
3223 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3224 }
3225
3226 /* Early check to avoid creating target */
3227 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3228 goto out;
3229 }
3230
3231 flags = bs->open_flags | BDRV_O_RDWR;
3232
3233 /* See if we have a backing HD we can use to create our new image
3234 * on top of. */
3235 if (sync == MIRROR_SYNC_MODE_TOP) {
3236 source = backing_bs(bs);
3237 if (!source) {
3238 sync = MIRROR_SYNC_MODE_FULL;
3239 }
3240 }
3241 if (sync == MIRROR_SYNC_MODE_NONE) {
3242 source = bs;
3243 }
3244
3245 size = bdrv_getlength(bs);
3246 if (size < 0) {
3247 error_setg_errno(errp, -size, "bdrv_getlength failed");
3248 goto out;
3249 }
3250
3251 if (mode != NEW_IMAGE_MODE_EXISTING) {
3252 assert(format);
3253 if (source) {
3254 bdrv_img_create(target, format, source->filename,
3255 source->drv->format_name, NULL,
3256 size, flags, &local_err, false);
3257 } else {
3258 bdrv_img_create(target, format, NULL, NULL, NULL,
3259 size, flags, &local_err, false);
3260 }
3261 }
3262
3263 if (local_err) {
3264 error_propagate(errp, local_err);
3265 goto out;
3266 }
3267
3268 if (format) {
3269 options = qdict_new();
3270 qdict_put(options, "driver", qstring_from_str(format));
3271 }
3272
3273 target_bs = NULL;
3274 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
3275 if (ret < 0) {
3276 error_propagate(errp, local_err);
3277 goto out;
3278 }
3279
3280 bdrv_set_aio_context(target_bs, aio_context);
3281
3282 if (has_bitmap) {
3283 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
3284 if (!bmap) {
3285 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
3286 bdrv_unref(target_bs);
3287 goto out;
3288 }
3289 }
3290
3291 backup_start(bs, target_bs, speed, sync, bmap,
3292 on_source_error, on_target_error,
3293 block_job_cb, bs, txn, &local_err);
3294 if (local_err != NULL) {
3295 bdrv_unref(target_bs);
3296 error_propagate(errp, local_err);
3297 goto out;
3298 }
3299
3300 out:
3301 aio_context_release(aio_context);
3302 }
3303
3304 void qmp_drive_backup(const char *device, const char *target,
3305 bool has_format, const char *format,
3306 enum MirrorSyncMode sync,
3307 bool has_mode, enum NewImageMode mode,
3308 bool has_speed, int64_t speed,
3309 bool has_bitmap, const char *bitmap,
3310 bool has_on_source_error, BlockdevOnError on_source_error,
3311 bool has_on_target_error, BlockdevOnError on_target_error,
3312 Error **errp)
3313 {
3314 return do_drive_backup(device, target, has_format, format, sync,
3315 has_mode, mode, has_speed, speed,
3316 has_bitmap, bitmap,
3317 has_on_source_error, on_source_error,
3318 has_on_target_error, on_target_error,
3319 NULL, errp);
3320 }
3321
3322 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3323 {
3324 return bdrv_named_nodes_list(errp);
3325 }
3326
3327 void do_blockdev_backup(const char *device, const char *target,
3328 enum MirrorSyncMode sync,
3329 bool has_speed, int64_t speed,
3330 bool has_on_source_error,
3331 BlockdevOnError on_source_error,
3332 bool has_on_target_error,
3333 BlockdevOnError on_target_error,
3334 BlockJobTxn *txn, Error **errp)
3335 {
3336 BlockBackend *blk, *target_blk;
3337 BlockDriverState *bs;
3338 BlockDriverState *target_bs;
3339 Error *local_err = NULL;
3340 AioContext *aio_context;
3341
3342 if (!has_speed) {
3343 speed = 0;
3344 }
3345 if (!has_on_source_error) {
3346 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3347 }
3348 if (!has_on_target_error) {
3349 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3350 }
3351
3352 blk = blk_by_name(device);
3353 if (!blk) {
3354 error_setg(errp, "Device '%s' not found", device);
3355 return;
3356 }
3357
3358 aio_context = blk_get_aio_context(blk);
3359 aio_context_acquire(aio_context);
3360
3361 if (!blk_is_available(blk)) {
3362 error_setg(errp, "Device '%s' has no medium", device);
3363 goto out;
3364 }
3365 bs = blk_bs(blk);
3366
3367 target_blk = blk_by_name(target);
3368 if (!target_blk) {
3369 error_setg(errp, "Device '%s' not found", target);
3370 goto out;
3371 }
3372
3373 if (!blk_is_available(target_blk)) {
3374 error_setg(errp, "Device '%s' has no medium", target);
3375 goto out;
3376 }
3377 target_bs = blk_bs(target_blk);
3378
3379 bdrv_ref(target_bs);
3380 bdrv_set_aio_context(target_bs, aio_context);
3381 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
3382 on_target_error, block_job_cb, bs, txn, &local_err);
3383 if (local_err != NULL) {
3384 bdrv_unref(target_bs);
3385 error_propagate(errp, local_err);
3386 }
3387 out:
3388 aio_context_release(aio_context);
3389 }
3390
3391 void qmp_blockdev_backup(const char *device, const char *target,
3392 enum MirrorSyncMode sync,
3393 bool has_speed, int64_t speed,
3394 bool has_on_source_error,
3395 BlockdevOnError on_source_error,
3396 bool has_on_target_error,
3397 BlockdevOnError on_target_error,
3398 Error **errp)
3399 {
3400 do_blockdev_backup(device, target, sync, has_speed, speed,
3401 has_on_source_error, on_source_error,
3402 has_on_target_error, on_target_error,
3403 NULL, errp);
3404 }
3405
3406 /* Parameter check and block job starting for drive mirroring.
3407 * Caller should hold @device and @target's aio context (must be the same).
3408 **/
3409 static void blockdev_mirror_common(BlockDriverState *bs,
3410 BlockDriverState *target,
3411 bool has_replaces, const char *replaces,
3412 enum MirrorSyncMode sync,
3413 bool has_speed, int64_t speed,
3414 bool has_granularity, uint32_t granularity,
3415 bool has_buf_size, int64_t buf_size,
3416 bool has_on_source_error,
3417 BlockdevOnError on_source_error,
3418 bool has_on_target_error,
3419 BlockdevOnError on_target_error,
3420 bool has_unmap, bool unmap,
3421 Error **errp)
3422 {
3423
3424 if (!has_speed) {
3425 speed = 0;
3426 }
3427 if (!has_on_source_error) {
3428 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3429 }
3430 if (!has_on_target_error) {
3431 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3432 }
3433 if (!has_granularity) {
3434 granularity = 0;
3435 }
3436 if (!has_buf_size) {
3437 buf_size = 0;
3438 }
3439 if (!has_unmap) {
3440 unmap = true;
3441 }
3442
3443 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3444 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3445 "a value in range [512B, 64MB]");
3446 return;
3447 }
3448 if (granularity & (granularity - 1)) {
3449 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3450 "power of 2");
3451 return;
3452 }
3453
3454 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3455 return;
3456 }
3457 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3458 return;
3459 }
3460 if (target->blk) {
3461 error_setg(errp, "Cannot mirror to an attached block device");
3462 return;
3463 }
3464
3465 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3466 sync = MIRROR_SYNC_MODE_FULL;
3467 }
3468
3469 /* pass the node name to replace to mirror start since it's loose coupling
3470 * and will allow to check whether the node still exist at mirror completion
3471 */
3472 mirror_start(bs, target,
3473 has_replaces ? replaces : NULL,
3474 speed, granularity, buf_size, sync,
3475 on_source_error, on_target_error, unmap,
3476 block_job_cb, bs, errp);
3477 }
3478
3479 void qmp_drive_mirror(const char *device, const char *target,
3480 bool has_format, const char *format,
3481 bool has_node_name, const char *node_name,
3482 bool has_replaces, const char *replaces,
3483 enum MirrorSyncMode sync,
3484 bool has_mode, enum NewImageMode mode,
3485 bool has_speed, int64_t speed,
3486 bool has_granularity, uint32_t granularity,
3487 bool has_buf_size, int64_t buf_size,
3488 bool has_on_source_error, BlockdevOnError on_source_error,
3489 bool has_on_target_error, BlockdevOnError on_target_error,
3490 bool has_unmap, bool unmap,
3491 Error **errp)
3492 {
3493 BlockDriverState *bs;
3494 BlockBackend *blk;
3495 BlockDriverState *source, *target_bs;
3496 AioContext *aio_context;
3497 Error *local_err = NULL;
3498 QDict *options = NULL;
3499 int flags;
3500 int64_t size;
3501 int ret;
3502
3503 blk = blk_by_name(device);
3504 if (!blk) {
3505 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3506 "Device '%s' not found", device);
3507 return;
3508 }
3509
3510 aio_context = blk_get_aio_context(blk);
3511 aio_context_acquire(aio_context);
3512
3513 if (!blk_is_available(blk)) {
3514 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3515 goto out;
3516 }
3517 bs = blk_bs(blk);
3518 if (!has_mode) {
3519 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3520 }
3521
3522 if (!has_format) {
3523 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3524 }
3525
3526 flags = bs->open_flags | BDRV_O_RDWR;
3527 source = backing_bs(bs);
3528 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3529 sync = MIRROR_SYNC_MODE_FULL;
3530 }
3531 if (sync == MIRROR_SYNC_MODE_NONE) {
3532 source = bs;
3533 }
3534
3535 size = bdrv_getlength(bs);
3536 if (size < 0) {
3537 error_setg_errno(errp, -size, "bdrv_getlength failed");
3538 goto out;
3539 }
3540
3541 if (has_replaces) {
3542 BlockDriverState *to_replace_bs;
3543 AioContext *replace_aio_context;
3544 int64_t replace_size;
3545
3546 if (!has_node_name) {
3547 error_setg(errp, "a node-name must be provided when replacing a"
3548 " named node of the graph");
3549 goto out;
3550 }
3551
3552 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3553
3554 if (!to_replace_bs) {
3555 error_propagate(errp, local_err);
3556 goto out;
3557 }
3558
3559 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3560 aio_context_acquire(replace_aio_context);
3561 replace_size = bdrv_getlength(to_replace_bs);
3562 aio_context_release(replace_aio_context);
3563
3564 if (size != replace_size) {
3565 error_setg(errp, "cannot replace image with a mirror image of "
3566 "different size");
3567 goto out;
3568 }
3569 }
3570
3571 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3572 && mode != NEW_IMAGE_MODE_EXISTING)
3573 {
3574 /* create new image w/o backing file */
3575 assert(format);
3576 bdrv_img_create(target, format,
3577 NULL, NULL, NULL, size, flags, &local_err, false);
3578 } else {
3579 switch (mode) {
3580 case NEW_IMAGE_MODE_EXISTING:
3581 break;
3582 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3583 /* create new image with backing file */
3584 bdrv_img_create(target, format,
3585 source->filename,
3586 source->drv->format_name,
3587 NULL, size, flags, &local_err, false);
3588 break;
3589 default:
3590 abort();
3591 }
3592 }
3593
3594 if (local_err) {
3595 error_propagate(errp, local_err);
3596 goto out;
3597 }
3598
3599 options = qdict_new();
3600 if (has_node_name) {
3601 qdict_put(options, "node-name", qstring_from_str(node_name));
3602 }
3603 if (format) {
3604 qdict_put(options, "driver", qstring_from_str(format));
3605 }
3606
3607 /* Mirroring takes care of copy-on-write using the source's backing
3608 * file.
3609 */
3610 target_bs = NULL;
3611 ret = bdrv_open(&target_bs, target, NULL, options,
3612 flags | BDRV_O_NO_BACKING, &local_err);
3613 if (ret < 0) {
3614 error_propagate(errp, local_err);
3615 goto out;
3616 }
3617
3618 bdrv_set_aio_context(target_bs, aio_context);
3619
3620 blockdev_mirror_common(bs, target_bs,
3621 has_replaces, replaces, sync,
3622 has_speed, speed,
3623 has_granularity, granularity,
3624 has_buf_size, buf_size,
3625 has_on_source_error, on_source_error,
3626 has_on_target_error, on_target_error,
3627 has_unmap, unmap,
3628 &local_err);
3629 if (local_err) {
3630 error_propagate(errp, local_err);
3631 bdrv_unref(target_bs);
3632 }
3633 out:
3634 aio_context_release(aio_context);
3635 }
3636
3637 void qmp_blockdev_mirror(const char *device, const char *target,
3638 bool has_replaces, const char *replaces,
3639 MirrorSyncMode sync,
3640 bool has_speed, int64_t speed,
3641 bool has_granularity, uint32_t granularity,
3642 bool has_buf_size, int64_t buf_size,
3643 bool has_on_source_error,
3644 BlockdevOnError on_source_error,
3645 bool has_on_target_error,
3646 BlockdevOnError on_target_error,
3647 Error **errp)
3648 {
3649 BlockDriverState *bs;
3650 BlockBackend *blk;
3651 BlockDriverState *target_bs;
3652 AioContext *aio_context;
3653 Error *local_err = NULL;
3654
3655 blk = blk_by_name(device);
3656 if (!blk) {
3657 error_setg(errp, "Device '%s' not found", device);
3658 return;
3659 }
3660 bs = blk_bs(blk);
3661
3662 if (!bs) {
3663 error_setg(errp, "Device '%s' has no media", device);
3664 return;
3665 }
3666
3667 target_bs = bdrv_lookup_bs(target, target, errp);
3668 if (!target_bs) {
3669 return;
3670 }
3671
3672 aio_context = bdrv_get_aio_context(bs);
3673 aio_context_acquire(aio_context);
3674
3675 bdrv_ref(target_bs);
3676 bdrv_set_aio_context(target_bs, aio_context);
3677
3678 blockdev_mirror_common(bs, target_bs,
3679 has_replaces, replaces, sync,
3680 has_speed, speed,
3681 has_granularity, granularity,
3682 has_buf_size, buf_size,
3683 has_on_source_error, on_source_error,
3684 has_on_target_error, on_target_error,
3685 true, true,
3686 &local_err);
3687 if (local_err) {
3688 error_propagate(errp, local_err);
3689 bdrv_unref(target_bs);
3690 }
3691
3692 aio_context_release(aio_context);
3693 }
3694
3695 /* Get the block job for a given device name and acquire its AioContext */
3696 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3697 Error **errp)
3698 {
3699 BlockBackend *blk;
3700 BlockDriverState *bs;
3701
3702 *aio_context = NULL;
3703
3704 blk = blk_by_name(device);
3705 if (!blk) {
3706 goto notfound;
3707 }
3708
3709 *aio_context = blk_get_aio_context(blk);
3710 aio_context_acquire(*aio_context);
3711
3712 if (!blk_is_available(blk)) {
3713 goto notfound;
3714 }
3715 bs = blk_bs(blk);
3716
3717 if (!bs->job) {
3718 goto notfound;
3719 }
3720
3721 return bs->job;
3722
3723 notfound:
3724 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3725 "No active block job on device '%s'", device);
3726 if (*aio_context) {
3727 aio_context_release(*aio_context);
3728 *aio_context = NULL;
3729 }
3730 return NULL;
3731 }
3732
3733 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3734 {
3735 AioContext *aio_context;
3736 BlockJob *job = find_block_job(device, &aio_context, errp);
3737
3738 if (!job) {
3739 return;
3740 }
3741
3742 block_job_set_speed(job, speed, errp);
3743 aio_context_release(aio_context);
3744 }
3745
3746 void qmp_block_job_cancel(const char *device,
3747 bool has_force, bool force, Error **errp)
3748 {
3749 AioContext *aio_context;
3750 BlockJob *job = find_block_job(device, &aio_context, errp);
3751
3752 if (!job) {
3753 return;
3754 }
3755
3756 if (!has_force) {
3757 force = false;
3758 }
3759
3760 if (job->user_paused && !force) {
3761 error_setg(errp, "The block job for device '%s' is currently paused",
3762 device);
3763 goto out;
3764 }
3765
3766 trace_qmp_block_job_cancel(job);
3767 block_job_cancel(job);
3768 out:
3769 aio_context_release(aio_context);
3770 }
3771
3772 void qmp_block_job_pause(const char *device, Error **errp)
3773 {
3774 AioContext *aio_context;
3775 BlockJob *job = find_block_job(device, &aio_context, errp);
3776
3777 if (!job || job->user_paused) {
3778 return;
3779 }
3780
3781 job->user_paused = true;
3782 trace_qmp_block_job_pause(job);
3783 block_job_pause(job);
3784 aio_context_release(aio_context);
3785 }
3786
3787 void qmp_block_job_resume(const char *device, Error **errp)
3788 {
3789 AioContext *aio_context;
3790 BlockJob *job = find_block_job(device, &aio_context, errp);
3791
3792 if (!job || !job->user_paused) {
3793 return;
3794 }
3795
3796 job->user_paused = false;
3797 trace_qmp_block_job_resume(job);
3798 block_job_resume(job);
3799 aio_context_release(aio_context);
3800 }
3801
3802 void qmp_block_job_complete(const char *device, Error **errp)
3803 {
3804 AioContext *aio_context;
3805 BlockJob *job = find_block_job(device, &aio_context, errp);
3806
3807 if (!job) {
3808 return;
3809 }
3810
3811 trace_qmp_block_job_complete(job);
3812 block_job_complete(job, errp);
3813 aio_context_release(aio_context);
3814 }
3815
3816 void qmp_change_backing_file(const char *device,
3817 const char *image_node_name,
3818 const char *backing_file,
3819 Error **errp)
3820 {
3821 BlockBackend *blk;
3822 BlockDriverState *bs = NULL;
3823 AioContext *aio_context;
3824 BlockDriverState *image_bs = NULL;
3825 Error *local_err = NULL;
3826 bool ro;
3827 int open_flags;
3828 int ret;
3829
3830 blk = blk_by_name(device);
3831 if (!blk) {
3832 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3833 "Device '%s' not found", device);
3834 return;
3835 }
3836
3837 aio_context = blk_get_aio_context(blk);
3838 aio_context_acquire(aio_context);
3839
3840 if (!blk_is_available(blk)) {
3841 error_setg(errp, "Device '%s' has no medium", device);
3842 goto out;
3843 }
3844 bs = blk_bs(blk);
3845
3846 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3847 if (local_err) {
3848 error_propagate(errp, local_err);
3849 goto out;
3850 }
3851
3852 if (!image_bs) {
3853 error_setg(errp, "image file not found");
3854 goto out;
3855 }
3856
3857 if (bdrv_find_base(image_bs) == image_bs) {
3858 error_setg(errp, "not allowing backing file change on an image "
3859 "without a backing file");
3860 goto out;
3861 }
3862
3863 /* even though we are not necessarily operating on bs, we need it to
3864 * determine if block ops are currently prohibited on the chain */
3865 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3866 goto out;
3867 }
3868
3869 /* final sanity check */
3870 if (!bdrv_chain_contains(bs, image_bs)) {
3871 error_setg(errp, "'%s' and image file are not in the same chain",
3872 device);
3873 goto out;
3874 }
3875
3876 /* if not r/w, reopen to make r/w */
3877 open_flags = image_bs->open_flags;
3878 ro = bdrv_is_read_only(image_bs);
3879
3880 if (ro) {
3881 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3882 if (local_err) {
3883 error_propagate(errp, local_err);
3884 goto out;
3885 }
3886 }
3887
3888 ret = bdrv_change_backing_file(image_bs, backing_file,
3889 image_bs->drv ? image_bs->drv->format_name : "");
3890
3891 if (ret < 0) {
3892 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3893 backing_file);
3894 /* don't exit here, so we can try to restore open flags if
3895 * appropriate */
3896 }
3897
3898 if (ro) {
3899 bdrv_reopen(image_bs, open_flags, &local_err);
3900 if (local_err) {
3901 error_propagate(errp, local_err); /* will preserve prior errp */
3902 }
3903 }
3904
3905 out:
3906 aio_context_release(aio_context);
3907 }
3908
3909 void hmp_drive_add_node(Monitor *mon, const char *optstr)
3910 {
3911 QemuOpts *opts;
3912 QDict *qdict;
3913 Error *local_err = NULL;
3914
3915 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
3916 if (!opts) {
3917 return;
3918 }
3919
3920 qdict = qemu_opts_to_qdict(opts, NULL);
3921
3922 if (!qdict_get_try_str(qdict, "node-name")) {
3923 QDECREF(qdict);
3924 error_report("'node-name' needs to be specified");
3925 goto out;
3926 }
3927
3928 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
3929 if (!bs) {
3930 error_report_err(local_err);
3931 goto out;
3932 }
3933
3934 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3935
3936 out:
3937 qemu_opts_del(opts);
3938 }
3939
3940 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3941 {
3942 QmpOutputVisitor *ov = qmp_output_visitor_new();
3943 BlockDriverState *bs;
3944 BlockBackend *blk = NULL;
3945 QObject *obj;
3946 QDict *qdict;
3947 Error *local_err = NULL;
3948
3949 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3950 * cache.direct=false instead of silently switching to aio=threads, except
3951 * when called from drive_new().
3952 *
3953 * For now, simply forbidding the combination for all drivers will do. */
3954 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3955 bool direct = options->has_cache &&
3956 options->cache->has_direct &&
3957 options->cache->direct;
3958 if (!direct) {
3959 error_setg(errp, "aio=native requires cache.direct=true");
3960 goto fail;
3961 }
3962 }
3963
3964 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), NULL, &options,
3965 &local_err);
3966 if (local_err) {
3967 error_propagate(errp, local_err);
3968 goto fail;
3969 }
3970
3971 obj = qmp_output_get_qobject(ov);
3972 qdict = qobject_to_qdict(obj);
3973
3974 qdict_flatten(qdict);
3975
3976 if (options->has_id) {
3977 blk = blockdev_init(NULL, qdict, &local_err);
3978 if (local_err) {
3979 error_propagate(errp, local_err);
3980 goto fail;
3981 }
3982
3983 bs = blk_bs(blk);
3984 } else {
3985 if (!qdict_get_try_str(qdict, "node-name")) {
3986 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3987 "the root node");
3988 goto fail;
3989 }
3990
3991 bs = bds_tree_init(qdict, errp);
3992 if (!bs) {
3993 goto fail;
3994 }
3995
3996 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3997 }
3998
3999 if (bs && bdrv_key_required(bs)) {
4000 if (blk) {
4001 monitor_remove_blk(blk);
4002 blk_unref(blk);
4003 } else {
4004 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4005 bdrv_unref(bs);
4006 }
4007 error_setg(errp, "blockdev-add doesn't support encrypted devices");
4008 goto fail;
4009 }
4010
4011 fail:
4012 qmp_output_visitor_cleanup(ov);
4013 }
4014
4015 void qmp_x_blockdev_del(bool has_id, const char *id,
4016 bool has_node_name, const char *node_name, Error **errp)
4017 {
4018 AioContext *aio_context;
4019 BlockBackend *blk;
4020 BlockDriverState *bs;
4021
4022 if (has_id && has_node_name) {
4023 error_setg(errp, "Only one of id and node-name must be specified");
4024 return;
4025 } else if (!has_id && !has_node_name) {
4026 error_setg(errp, "No block device specified");
4027 return;
4028 }
4029
4030 if (has_id) {
4031 /* blk_by_name() never returns a BB that is not owned by the monitor */
4032 blk = blk_by_name(id);
4033 if (!blk) {
4034 error_setg(errp, "Cannot find block backend %s", id);
4035 return;
4036 }
4037 if (blk_legacy_dinfo(blk)) {
4038 error_setg(errp, "Deleting block backend added with drive-add"
4039 " is not supported");
4040 return;
4041 }
4042 if (blk_get_refcnt(blk) > 1) {
4043 error_setg(errp, "Block backend %s is in use", id);
4044 return;
4045 }
4046 bs = blk_bs(blk);
4047 aio_context = blk_get_aio_context(blk);
4048 } else {
4049 bs = bdrv_find_node(node_name);
4050 if (!bs) {
4051 error_setg(errp, "Cannot find node %s", node_name);
4052 return;
4053 }
4054 blk = bs->blk;
4055 if (blk) {
4056 error_setg(errp, "Node %s is in use by %s",
4057 node_name, blk_name(blk));
4058 return;
4059 }
4060 aio_context = bdrv_get_aio_context(bs);
4061 }
4062
4063 aio_context_acquire(aio_context);
4064
4065 if (bs) {
4066 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4067 goto out;
4068 }
4069
4070 if (!blk && !bs->monitor_list.tqe_prev) {
4071 error_setg(errp, "Node %s is not owned by the monitor",
4072 bs->node_name);
4073 goto out;
4074 }
4075
4076 if (bs->refcnt > 1) {
4077 error_setg(errp, "Block device %s is in use",
4078 bdrv_get_device_or_node_name(bs));
4079 goto out;
4080 }
4081 }
4082
4083 if (blk) {
4084 monitor_remove_blk(blk);
4085 blk_unref(blk);
4086 } else {
4087 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4088 bdrv_unref(bs);
4089 }
4090
4091 out:
4092 aio_context_release(aio_context);
4093 }
4094
4095 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4096 {
4097 BlockJobInfoList *head = NULL, **p_next = &head;
4098 BlockDriverState *bs;
4099
4100 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
4101 AioContext *aio_context = bdrv_get_aio_context(bs);
4102
4103 aio_context_acquire(aio_context);
4104
4105 if (bs->job) {
4106 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
4107 elem->value = block_job_query(bs->job);
4108 *p_next = elem;
4109 p_next = &elem->next;
4110 }
4111
4112 aio_context_release(aio_context);
4113 }
4114
4115 return head;
4116 }
4117
4118 QemuOptsList qemu_common_drive_opts = {
4119 .name = "drive",
4120 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4121 .desc = {
4122 {
4123 .name = "snapshot",
4124 .type = QEMU_OPT_BOOL,
4125 .help = "enable/disable snapshot mode",
4126 },{
4127 .name = "discard",
4128 .type = QEMU_OPT_STRING,
4129 .help = "discard operation (ignore/off, unmap/on)",
4130 },{
4131 .name = "aio",
4132 .type = QEMU_OPT_STRING,
4133 .help = "host AIO implementation (threads, native)",
4134 },{
4135 .name = BDRV_OPT_CACHE_WB,
4136 .type = QEMU_OPT_BOOL,
4137 .help = "Enable writeback mode",
4138 },{
4139 .name = "format",
4140 .type = QEMU_OPT_STRING,
4141 .help = "disk format (raw, qcow2, ...)",
4142 },{
4143 .name = "rerror",
4144 .type = QEMU_OPT_STRING,
4145 .help = "read error action",
4146 },{
4147 .name = "werror",
4148 .type = QEMU_OPT_STRING,
4149 .help = "write error action",
4150 },{
4151 .name = "read-only",
4152 .type = QEMU_OPT_BOOL,
4153 .help = "open drive file as read-only",
4154 },{
4155 .name = "throttling.iops-total",
4156 .type = QEMU_OPT_NUMBER,
4157 .help = "limit total I/O operations per second",
4158 },{
4159 .name = "throttling.iops-read",
4160 .type = QEMU_OPT_NUMBER,
4161 .help = "limit read operations per second",
4162 },{
4163 .name = "throttling.iops-write",
4164 .type = QEMU_OPT_NUMBER,
4165 .help = "limit write operations per second",
4166 },{
4167 .name = "throttling.bps-total",
4168 .type = QEMU_OPT_NUMBER,
4169 .help = "limit total bytes per second",
4170 },{
4171 .name = "throttling.bps-read",
4172 .type = QEMU_OPT_NUMBER,
4173 .help = "limit read bytes per second",
4174 },{
4175 .name = "throttling.bps-write",
4176 .type = QEMU_OPT_NUMBER,
4177 .help = "limit write bytes per second",
4178 },{
4179 .name = "throttling.iops-total-max",
4180 .type = QEMU_OPT_NUMBER,
4181 .help = "I/O operations burst",
4182 },{
4183 .name = "throttling.iops-read-max",
4184 .type = QEMU_OPT_NUMBER,
4185 .help = "I/O operations read burst",
4186 },{
4187 .name = "throttling.iops-write-max",
4188 .type = QEMU_OPT_NUMBER,
4189 .help = "I/O operations write burst",
4190 },{
4191 .name = "throttling.bps-total-max",
4192 .type = QEMU_OPT_NUMBER,
4193 .help = "total bytes burst",
4194 },{
4195 .name = "throttling.bps-read-max",
4196 .type = QEMU_OPT_NUMBER,
4197 .help = "total bytes read burst",
4198 },{
4199 .name = "throttling.bps-write-max",
4200 .type = QEMU_OPT_NUMBER,
4201 .help = "total bytes write burst",
4202 },{
4203 .name = "throttling.iops-total-max-length",
4204 .type = QEMU_OPT_NUMBER,
4205 .help = "length of the iops-total-max burst period, in seconds",
4206 },{
4207 .name = "throttling.iops-read-max-length",
4208 .type = QEMU_OPT_NUMBER,
4209 .help = "length of the iops-read-max burst period, in seconds",
4210 },{
4211 .name = "throttling.iops-write-max-length",
4212 .type = QEMU_OPT_NUMBER,
4213 .help = "length of the iops-write-max burst period, in seconds",
4214 },{
4215 .name = "throttling.bps-total-max-length",
4216 .type = QEMU_OPT_NUMBER,
4217 .help = "length of the bps-total-max burst period, in seconds",
4218 },{
4219 .name = "throttling.bps-read-max-length",
4220 .type = QEMU_OPT_NUMBER,
4221 .help = "length of the bps-read-max burst period, in seconds",
4222 },{
4223 .name = "throttling.bps-write-max-length",
4224 .type = QEMU_OPT_NUMBER,
4225 .help = "length of the bps-write-max burst period, in seconds",
4226 },{
4227 .name = "throttling.iops-size",
4228 .type = QEMU_OPT_NUMBER,
4229 .help = "when limiting by iops max size of an I/O in bytes",
4230 },{
4231 .name = "throttling.group",
4232 .type = QEMU_OPT_STRING,
4233 .help = "name of the block throttling group",
4234 },{
4235 .name = "copy-on-read",
4236 .type = QEMU_OPT_BOOL,
4237 .help = "copy read data from backing file into image file",
4238 },{
4239 .name = "detect-zeroes",
4240 .type = QEMU_OPT_STRING,
4241 .help = "try to optimize zero writes (off, on, unmap)",
4242 },{
4243 .name = "stats-account-invalid",
4244 .type = QEMU_OPT_BOOL,
4245 .help = "whether to account for invalid I/O operations "
4246 "in the statistics",
4247 },{
4248 .name = "stats-account-failed",
4249 .type = QEMU_OPT_BOOL,
4250 .help = "whether to account for failed I/O operations "
4251 "in the statistics",
4252 },
4253 { /* end of list */ }
4254 },
4255 };
4256
4257 static QemuOptsList qemu_root_bds_opts = {
4258 .name = "root-bds",
4259 .head = QTAILQ_HEAD_INITIALIZER(qemu_root_bds_opts.head),
4260 .desc = {
4261 {
4262 .name = "discard",
4263 .type = QEMU_OPT_STRING,
4264 .help = "discard operation (ignore/off, unmap/on)",
4265 },{
4266 .name = "aio",
4267 .type = QEMU_OPT_STRING,
4268 .help = "host AIO implementation (threads, native)",
4269 },{
4270 .name = "read-only",
4271 .type = QEMU_OPT_BOOL,
4272 .help = "open drive file as read-only",
4273 },{
4274 .name = "copy-on-read",
4275 .type = QEMU_OPT_BOOL,
4276 .help = "copy read data from backing file into image file",
4277 },{
4278 .name = "detect-zeroes",
4279 .type = QEMU_OPT_STRING,
4280 .help = "try to optimize zero writes (off, on, unmap)",
4281 },
4282 { /* end of list */ }
4283 },
4284 };
4285
4286 QemuOptsList qemu_drive_opts = {
4287 .name = "drive",
4288 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4289 .desc = {
4290 /*
4291 * no elements => accept any params
4292 * validation will happen later
4293 */
4294 { /* end of list */ }
4295 },
4296 };
QEmu