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Merge remote-tracking branch 'remotes/vivier/tags/m68k-for-2.12-pull-request' into...
[qemu/ar7.git] / blockdev.c
blob1fbfd3a2c40d9d9b495c616c209cfdca2da15031
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/qapi-commands-block.h"
44 #include "qapi/qapi-commands-transaction.h"
45 #include "qapi/qapi-visit-block-core.h"
46 #include "qapi/qmp/qdict.h"
47 #include "qapi/qmp/qnum.h"
48 #include "qapi/qmp/qstring.h"
49 #include "qapi/error.h"
50 #include "qapi/qmp/qerror.h"
51 #include "qapi/qmp/qlist.h"
52 #include "qapi/qobject-output-visitor.h"
53 #include "sysemu/sysemu.h"
54 #include "sysemu/iothread.h"
55 #include "block/block_int.h"
56 #include "block/trace.h"
57 #include "sysemu/arch_init.h"
58 #include "sysemu/qtest.h"
59 #include "qemu/cutils.h"
60 #include "qemu/help_option.h"
61 #include "qemu/throttle-options.h"
62
63 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
64 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
65
66 static int do_open_tray(const char *blk_name, const char *qdev_id,
67 bool force, Error **errp);
68 static void blockdev_remove_medium(bool has_device, const char *device,
69 bool has_id, const char *id, Error **errp);
70 static void blockdev_insert_medium(bool has_device, const char *device,
71 bool has_id, const char *id,
72 const char *node_name, Error **errp);
73
74 static const char *const if_name[IF_COUNT] = {
75 [IF_NONE] = "none",
76 [IF_IDE] = "ide",
77 [IF_SCSI] = "scsi",
78 [IF_FLOPPY] = "floppy",
79 [IF_PFLASH] = "pflash",
80 [IF_MTD] = "mtd",
81 [IF_SD] = "sd",
82 [IF_VIRTIO] = "virtio",
83 [IF_XEN] = "xen",
84 };
85
86 static int if_max_devs[IF_COUNT] = {
87 /*
88 * Do not change these numbers! They govern how drive option
89 * index maps to unit and bus. That mapping is ABI.
90 *
91 * All controllers used to implement if=T drives need to support
92 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
93 * Otherwise, some index values map to "impossible" bus, unit
94 * values.
95 *
96 * For instance, if you change [IF_SCSI] to 255, -drive
97 * if=scsi,index=12 no longer means bus=1,unit=5, but
98 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
99 * the drive can't be set up. Regression.
100 */
101 [IF_IDE] = 2,
102 [IF_SCSI] = 7,
103 };
104
105 /**
106 * Boards may call this to offer board-by-board overrides
107 * of the default, global values.
108 */
109 void override_max_devs(BlockInterfaceType type, int max_devs)
110 {
111 BlockBackend *blk;
112 DriveInfo *dinfo;
113
114 if (max_devs <= 0) {
115 return;
116 }
117
118 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
119 dinfo = blk_legacy_dinfo(blk);
120 if (dinfo->type == type) {
121 fprintf(stderr, "Cannot override units-per-bus property of"
122 " the %s interface, because a drive of that type has"
123 " already been added.\n", if_name[type]);
124 g_assert_not_reached();
125 }
126 }
127
128 if_max_devs[type] = max_devs;
129 }
130
131 /*
132 * We automatically delete the drive when a device using it gets
133 * unplugged. Questionable feature, but we can't just drop it.
134 * Device models call blockdev_mark_auto_del() to schedule the
135 * automatic deletion, and generic qdev code calls blockdev_auto_del()
136 * when deletion is actually safe.
137 */
138 void blockdev_mark_auto_del(BlockBackend *blk)
139 {
140 DriveInfo *dinfo = blk_legacy_dinfo(blk);
141 BlockDriverState *bs = blk_bs(blk);
142 AioContext *aio_context;
143
144 if (!dinfo) {
145 return;
146 }
147
148 if (bs) {
149 aio_context = bdrv_get_aio_context(bs);
150 aio_context_acquire(aio_context);
151
152 if (bs->job) {
153 block_job_cancel(bs->job);
154 }
155
156 aio_context_release(aio_context);
157 }
158
159 dinfo->auto_del = 1;
160 }
161
162 void blockdev_auto_del(BlockBackend *blk)
163 {
164 DriveInfo *dinfo = blk_legacy_dinfo(blk);
165
166 if (dinfo && dinfo->auto_del) {
167 monitor_remove_blk(blk);
168 blk_unref(blk);
169 }
170 }
171
172 /**
173 * Returns the current mapping of how many units per bus
174 * a particular interface can support.
175 *
176 * A positive integer indicates n units per bus.
177 * 0 implies the mapping has not been established.
178 * -1 indicates an invalid BlockInterfaceType was given.
179 */
180 int drive_get_max_devs(BlockInterfaceType type)
181 {
182 if (type >= IF_IDE && type < IF_COUNT) {
183 return if_max_devs[type];
184 }
185
186 return -1;
187 }
188
189 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
190 {
191 int max_devs = if_max_devs[type];
192 return max_devs ? index / max_devs : 0;
193 }
194
195 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
196 {
197 int max_devs = if_max_devs[type];
198 return max_devs ? index % max_devs : index;
199 }
200
201 QemuOpts *drive_def(const char *optstr)
202 {
203 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
204 }
205
206 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
207 const char *optstr)
208 {
209 QemuOpts *opts;
210
211 opts = drive_def(optstr);
212 if (!opts) {
213 return NULL;
214 }
215 if (type != IF_DEFAULT) {
216 qemu_opt_set(opts, "if", if_name[type], &error_abort);
217 }
218 if (index >= 0) {
219 qemu_opt_set_number(opts, "index", index, &error_abort);
220 }
221 if (file)
222 qemu_opt_set(opts, "file", file, &error_abort);
223 return opts;
224 }
225
226 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
227 {
228 BlockBackend *blk;
229 DriveInfo *dinfo;
230
231 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
232 dinfo = blk_legacy_dinfo(blk);
233 if (dinfo && dinfo->type == type
234 && dinfo->bus == bus && dinfo->unit == unit) {
235 return dinfo;
236 }
237 }
238
239 return NULL;
240 }
241
242 void drive_check_orphaned(void)
243 {
244 BlockBackend *blk;
245 DriveInfo *dinfo;
246 Location loc;
247 bool orphans = false;
248
249 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
250 dinfo = blk_legacy_dinfo(blk);
251 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
252 dinfo->type != IF_NONE) {
253 loc_push_none(&loc);
254 qemu_opts_loc_restore(dinfo->opts);
255 error_report("machine type does not support"
256 " if=%s,bus=%d,unit=%d",
257 if_name[dinfo->type], dinfo->bus, dinfo->unit);
258 loc_pop(&loc);
259 orphans = true;
260 }
261 }
262
263 if (orphans) {
264 exit(1);
265 }
266 }
267
268 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
269 {
270 return drive_get(type,
271 drive_index_to_bus_id(type, index),
272 drive_index_to_unit_id(type, index));
273 }
274
275 int drive_get_max_bus(BlockInterfaceType type)
276 {
277 int max_bus;
278 BlockBackend *blk;
279 DriveInfo *dinfo;
280
281 max_bus = -1;
282 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
283 dinfo = blk_legacy_dinfo(blk);
284 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
285 max_bus = dinfo->bus;
286 }
287 }
288 return max_bus;
289 }
290
291 /* Get a block device. This should only be used for single-drive devices
292 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
293 appropriate bus. */
294 DriveInfo *drive_get_next(BlockInterfaceType type)
295 {
296 static int next_block_unit[IF_COUNT];
297
298 return drive_get(type, 0, next_block_unit[type]++);
299 }
300
301 static void bdrv_format_print(void *opaque, const char *name)
302 {
303 error_printf(" %s", name);
304 }
305
306 typedef struct {
307 QEMUBH *bh;
308 BlockDriverState *bs;
309 } BDRVPutRefBH;
310
311 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
312 {
313 if (!strcmp(buf, "ignore")) {
314 return BLOCKDEV_ON_ERROR_IGNORE;
315 } else if (!is_read && !strcmp(buf, "enospc")) {
316 return BLOCKDEV_ON_ERROR_ENOSPC;
317 } else if (!strcmp(buf, "stop")) {
318 return BLOCKDEV_ON_ERROR_STOP;
319 } else if (!strcmp(buf, "report")) {
320 return BLOCKDEV_ON_ERROR_REPORT;
321 } else {
322 error_setg(errp, "'%s' invalid %s error action",
323 buf, is_read ? "read" : "write");
324 return -1;
325 }
326 }
327
328 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
329 Error **errp)
330 {
331 const QListEntry *entry;
332 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
333 switch (qobject_type(entry->value)) {
334
335 case QTYPE_QSTRING: {
336 unsigned long long length;
337 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
338 if (parse_uint_full(str, &length, 10) == 0 &&
339 length > 0 && length <= UINT_MAX) {
340 block_acct_add_interval(stats, (unsigned) length);
341 } else {
342 error_setg(errp, "Invalid interval length: %s", str);
343 return false;
344 }
345 break;
346 }
347
348 case QTYPE_QNUM: {
349 int64_t length = qnum_get_int(qobject_to_qnum(entry->value));
350
351 if (length > 0 && length <= UINT_MAX) {
352 block_acct_add_interval(stats, (unsigned) length);
353 } else {
354 error_setg(errp, "Invalid interval length: %" PRId64, length);
355 return false;
356 }
357 break;
358 }
359
360 default:
361 error_setg(errp, "The specification of stats-intervals is invalid");
362 return false;
363 }
364 }
365 return true;
366 }
367
368 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
369
370 /* All parameters but @opts are optional and may be set to NULL. */
371 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
372 const char **throttling_group, ThrottleConfig *throttle_cfg,
373 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
374 {
375 Error *local_error = NULL;
376 const char *aio;
377
378 if (bdrv_flags) {
379 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
380 *bdrv_flags |= BDRV_O_COPY_ON_READ;
381 }
382
383 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
384 if (!strcmp(aio, "native")) {
385 *bdrv_flags |= BDRV_O_NATIVE_AIO;
386 } else if (!strcmp(aio, "threads")) {
387 /* this is the default */
388 } else {
389 error_setg(errp, "invalid aio option");
390 return;
391 }
392 }
393 }
394
395 /* disk I/O throttling */
396 if (throttling_group) {
397 *throttling_group = qemu_opt_get(opts, "throttling.group");
398 }
399
400 if (throttle_cfg) {
401 throttle_config_init(throttle_cfg);
402 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
403 qemu_opt_get_number(opts, "throttling.bps-total", 0);
404 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
405 qemu_opt_get_number(opts, "throttling.bps-read", 0);
406 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
407 qemu_opt_get_number(opts, "throttling.bps-write", 0);
408 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
409 qemu_opt_get_number(opts, "throttling.iops-total", 0);
410 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
411 qemu_opt_get_number(opts, "throttling.iops-read", 0);
412 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
413 qemu_opt_get_number(opts, "throttling.iops-write", 0);
414
415 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
416 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
417 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
418 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
419 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
420 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
421 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
422 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
423 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
424 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
425 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
426 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
427
428 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
429 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
430 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
431 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
432 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
433 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
434 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
435 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
436 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
437 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
438 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
439 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
440
441 throttle_cfg->op_size =
442 qemu_opt_get_number(opts, "throttling.iops-size", 0);
443
444 if (!throttle_is_valid(throttle_cfg, errp)) {
445 return;
446 }
447 }
448
449 if (detect_zeroes) {
450 *detect_zeroes =
451 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
452 qemu_opt_get(opts, "detect-zeroes"),
453 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
454 &local_error);
455 if (local_error) {
456 error_propagate(errp, local_error);
457 return;
458 }
459 }
460 }
461
462 /* Takes the ownership of bs_opts */
463 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
464 Error **errp)
465 {
466 const char *buf;
467 int bdrv_flags = 0;
468 int on_read_error, on_write_error;
469 bool account_invalid, account_failed;
470 bool writethrough, read_only;
471 BlockBackend *blk;
472 BlockDriverState *bs;
473 ThrottleConfig cfg;
474 int snapshot = 0;
475 Error *error = NULL;
476 QemuOpts *opts;
477 QDict *interval_dict = NULL;
478 QList *interval_list = NULL;
479 const char *id;
480 BlockdevDetectZeroesOptions detect_zeroes =
481 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
482 const char *throttling_group = NULL;
483
484 /* Check common options by copying from bs_opts to opts, all other options
485 * stay in bs_opts for processing by bdrv_open(). */
486 id = qdict_get_try_str(bs_opts, "id");
487 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
488 if (error) {
489 error_propagate(errp, error);
490 goto err_no_opts;
491 }
492
493 qemu_opts_absorb_qdict(opts, bs_opts, &error);
494 if (error) {
495 error_propagate(errp, error);
496 goto early_err;
497 }
498
499 if (id) {
500 qdict_del(bs_opts, "id");
501 }
502
503 /* extract parameters */
504 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
505
506 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
507 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
508
509 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
510
511 id = qemu_opts_id(opts);
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_str(bs_opts, "driver", 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 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
567
568 /* init */
569 if ((!file || !*file) && !qdict_size(bs_opts)) {
570 BlockBackendRootState *blk_rs;
571
572 blk = blk_new(0, BLK_PERM_ALL);
573 blk_rs = blk_get_root_state(blk);
574 blk_rs->open_flags = bdrv_flags;
575 blk_rs->read_only = read_only;
576 blk_rs->detect_zeroes = detect_zeroes;
577
578 QDECREF(bs_opts);
579 } else {
580 if (file && !*file) {
581 file = NULL;
582 }
583
584 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
585 * with other callers) rather than what we want as the real defaults.
586 * Apply the defaults here instead. */
587 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
588 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
589 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
590 read_only ? "on" : "off");
591 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
592
593 if (runstate_check(RUN_STATE_INMIGRATE)) {
594 bdrv_flags |= BDRV_O_INACTIVE;
595 }
596
597 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
598 if (!blk) {
599 goto err_no_bs_opts;
600 }
601 bs = blk_bs(blk);
602
603 bs->detect_zeroes = detect_zeroes;
604
605 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
606
607 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
608 blk_unref(blk);
609 blk = NULL;
610 goto err_no_bs_opts;
611 }
612 }
613
614 /* disk I/O throttling */
615 if (throttle_enabled(&cfg)) {
616 if (!throttling_group) {
617 throttling_group = id;
618 }
619 blk_io_limits_enable(blk, throttling_group);
620 blk_set_io_limits(blk, &cfg);
621 }
622
623 blk_set_enable_write_cache(blk, !writethrough);
624 blk_set_on_error(blk, on_read_error, on_write_error);
625
626 if (!monitor_add_blk(blk, id, errp)) {
627 blk_unref(blk);
628 blk = NULL;
629 goto err_no_bs_opts;
630 }
631
632 err_no_bs_opts:
633 qemu_opts_del(opts);
634 QDECREF(interval_dict);
635 QDECREF(interval_list);
636 return blk;
637
638 early_err:
639 qemu_opts_del(opts);
640 QDECREF(interval_dict);
641 QDECREF(interval_list);
642 err_no_opts:
643 QDECREF(bs_opts);
644 return NULL;
645 }
646
647 /* Takes the ownership of bs_opts */
648 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
649 {
650 int bdrv_flags = 0;
651
652 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
653 * with other callers) rather than what we want as the real defaults.
654 * Apply the defaults here instead. */
655 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
656 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
657 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
658
659 if (runstate_check(RUN_STATE_INMIGRATE)) {
660 bdrv_flags |= BDRV_O_INACTIVE;
661 }
662
663 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
664 }
665
666 void blockdev_close_all_bdrv_states(void)
667 {
668 BlockDriverState *bs, *next_bs;
669
670 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
671 AioContext *ctx = bdrv_get_aio_context(bs);
672
673 aio_context_acquire(ctx);
674 bdrv_unref(bs);
675 aio_context_release(ctx);
676 }
677 }
678
679 /* Iterates over the list of monitor-owned BlockDriverStates */
680 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
681 {
682 return bs ? QTAILQ_NEXT(bs, monitor_list)
683 : QTAILQ_FIRST(&monitor_bdrv_states);
684 }
685
686 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
687 Error **errp)
688 {
689 const char *value;
690
691 value = qemu_opt_get(opts, from);
692 if (value) {
693 if (qemu_opt_find(opts, to)) {
694 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
695 "same time", to, from);
696 return;
697 }
698 }
699
700 /* rename all items in opts */
701 while ((value = qemu_opt_get(opts, from))) {
702 qemu_opt_set(opts, to, value, &error_abort);
703 qemu_opt_unset(opts, from);
704 }
705 }
706
707 QemuOptsList qemu_legacy_drive_opts = {
708 .name = "drive",
709 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
710 .desc = {
711 {
712 .name = "bus",
713 .type = QEMU_OPT_NUMBER,
714 .help = "bus number",
715 },{
716 .name = "unit",
717 .type = QEMU_OPT_NUMBER,
718 .help = "unit number (i.e. lun for scsi)",
719 },{
720 .name = "index",
721 .type = QEMU_OPT_NUMBER,
722 .help = "index number",
723 },{
724 .name = "media",
725 .type = QEMU_OPT_STRING,
726 .help = "media type (disk, cdrom)",
727 },{
728 .name = "if",
729 .type = QEMU_OPT_STRING,
730 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
731 },{
732 .name = "cyls",
733 .type = QEMU_OPT_NUMBER,
734 .help = "number of cylinders (ide disk geometry)",
735 },{
736 .name = "heads",
737 .type = QEMU_OPT_NUMBER,
738 .help = "number of heads (ide disk geometry)",
739 },{
740 .name = "secs",
741 .type = QEMU_OPT_NUMBER,
742 .help = "number of sectors (ide disk geometry)",
743 },{
744 .name = "trans",
745 .type = QEMU_OPT_STRING,
746 .help = "chs translation (auto, lba, none)",
747 },{
748 .name = "addr",
749 .type = QEMU_OPT_STRING,
750 .help = "pci address (virtio only)",
751 },{
752 .name = "serial",
753 .type = QEMU_OPT_STRING,
754 .help = "disk serial number",
755 },{
756 .name = "file",
757 .type = QEMU_OPT_STRING,
758 .help = "file name",
759 },
760
761 /* Options that are passed on, but have special semantics with -drive */
762 {
763 .name = BDRV_OPT_READ_ONLY,
764 .type = QEMU_OPT_BOOL,
765 .help = "open drive file as read-only",
766 },{
767 .name = "rerror",
768 .type = QEMU_OPT_STRING,
769 .help = "read error action",
770 },{
771 .name = "werror",
772 .type = QEMU_OPT_STRING,
773 .help = "write error action",
774 },{
775 .name = "copy-on-read",
776 .type = QEMU_OPT_BOOL,
777 .help = "copy read data from backing file into image file",
778 },
779
780 { /* end of list */ }
781 },
782 };
783
784 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
785 {
786 const char *value;
787 BlockBackend *blk;
788 DriveInfo *dinfo = NULL;
789 QDict *bs_opts;
790 QemuOpts *legacy_opts;
791 DriveMediaType media = MEDIA_DISK;
792 BlockInterfaceType type;
793 int cyls, heads, secs, translation;
794 int max_devs, bus_id, unit_id, index;
795 const char *devaddr;
796 const char *werror, *rerror;
797 bool read_only = false;
798 bool copy_on_read;
799 const char *serial;
800 const char *filename;
801 Error *local_err = NULL;
802 int i;
803 const char *deprecated[] = {
804 "serial", "trans", "secs", "heads", "cyls", "addr"
805 };
806
807 /* Change legacy command line options into QMP ones */
808 static const struct {
809 const char *from;
810 const char *to;
811 } opt_renames[] = {
812 { "iops", "throttling.iops-total" },
813 { "iops_rd", "throttling.iops-read" },
814 { "iops_wr", "throttling.iops-write" },
815
816 { "bps", "throttling.bps-total" },
817 { "bps_rd", "throttling.bps-read" },
818 { "bps_wr", "throttling.bps-write" },
819
820 { "iops_max", "throttling.iops-total-max" },
821 { "iops_rd_max", "throttling.iops-read-max" },
822 { "iops_wr_max", "throttling.iops-write-max" },
823
824 { "bps_max", "throttling.bps-total-max" },
825 { "bps_rd_max", "throttling.bps-read-max" },
826 { "bps_wr_max", "throttling.bps-write-max" },
827
828 { "iops_size", "throttling.iops-size" },
829
830 { "group", "throttling.group" },
831
832 { "readonly", BDRV_OPT_READ_ONLY },
833 };
834
835 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
836 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
837 &local_err);
838 if (local_err) {
839 error_report_err(local_err);
840 return NULL;
841 }
842 }
843
844 value = qemu_opt_get(all_opts, "cache");
845 if (value) {
846 int flags = 0;
847 bool writethrough;
848
849 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
850 error_report("invalid cache option");
851 return NULL;
852 }
853
854 /* Specific options take precedence */
855 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
856 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
857 !writethrough, &error_abort);
858 }
859 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
860 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
861 !!(flags & BDRV_O_NOCACHE), &error_abort);
862 }
863 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
864 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
865 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
866 }
867 qemu_opt_unset(all_opts, "cache");
868 }
869
870 /* Get a QDict for processing the options */
871 bs_opts = qdict_new();
872 qemu_opts_to_qdict(all_opts, bs_opts);
873
874 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
875 &error_abort);
876 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
877 if (local_err) {
878 error_report_err(local_err);
879 goto fail;
880 }
881
882 /* Other deprecated options */
883 if (!qtest_enabled()) {
884 for (i = 0; i < ARRAY_SIZE(deprecated); i++) {
885 if (qemu_opt_get(legacy_opts, deprecated[i]) != NULL) {
886 error_report("'%s' is deprecated, please use the corresponding "
887 "option of '-device' instead", deprecated[i]);
888 }
889 }
890 }
891
892 /* Media type */
893 value = qemu_opt_get(legacy_opts, "media");
894 if (value) {
895 if (!strcmp(value, "disk")) {
896 media = MEDIA_DISK;
897 } else if (!strcmp(value, "cdrom")) {
898 media = MEDIA_CDROM;
899 read_only = true;
900 } else {
901 error_report("'%s' invalid media", value);
902 goto fail;
903 }
904 }
905
906 /* copy-on-read is disabled with a warning for read-only devices */
907 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
908 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
909
910 if (read_only && copy_on_read) {
911 warn_report("disabling copy-on-read on read-only drive");
912 copy_on_read = false;
913 }
914
915 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
916 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
917
918 /* Controller type */
919 value = qemu_opt_get(legacy_opts, "if");
920 if (value) {
921 for (type = 0;
922 type < IF_COUNT && strcmp(value, if_name[type]);
923 type++) {
924 }
925 if (type == IF_COUNT) {
926 error_report("unsupported bus type '%s'", value);
927 goto fail;
928 }
929 } else {
930 type = block_default_type;
931 }
932
933 /* Geometry */
934 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
935 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
936 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
937
938 if (cyls || heads || secs) {
939 if (cyls < 1) {
940 error_report("invalid physical cyls number");
941 goto fail;
942 }
943 if (heads < 1) {
944 error_report("invalid physical heads number");
945 goto fail;
946 }
947 if (secs < 1) {
948 error_report("invalid physical secs number");
949 goto fail;
950 }
951 }
952
953 translation = BIOS_ATA_TRANSLATION_AUTO;
954 value = qemu_opt_get(legacy_opts, "trans");
955 if (value != NULL) {
956 if (!cyls) {
957 error_report("'%s' trans must be used with cyls, heads and secs",
958 value);
959 goto fail;
960 }
961 if (!strcmp(value, "none")) {
962 translation = BIOS_ATA_TRANSLATION_NONE;
963 } else if (!strcmp(value, "lba")) {
964 translation = BIOS_ATA_TRANSLATION_LBA;
965 } else if (!strcmp(value, "large")) {
966 translation = BIOS_ATA_TRANSLATION_LARGE;
967 } else if (!strcmp(value, "rechs")) {
968 translation = BIOS_ATA_TRANSLATION_RECHS;
969 } else if (!strcmp(value, "auto")) {
970 translation = BIOS_ATA_TRANSLATION_AUTO;
971 } else {
972 error_report("'%s' invalid translation type", value);
973 goto fail;
974 }
975 }
976
977 if (media == MEDIA_CDROM) {
978 if (cyls || secs || heads) {
979 error_report("CHS can't be set with media=cdrom");
980 goto fail;
981 }
982 }
983
984 /* Device address specified by bus/unit or index.
985 * If none was specified, try to find the first free one. */
986 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
987 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
988 index = qemu_opt_get_number(legacy_opts, "index", -1);
989
990 max_devs = if_max_devs[type];
991
992 if (index != -1) {
993 if (bus_id != 0 || unit_id != -1) {
994 error_report("index cannot be used with bus and unit");
995 goto fail;
996 }
997 bus_id = drive_index_to_bus_id(type, index);
998 unit_id = drive_index_to_unit_id(type, index);
999 }
1000
1001 if (unit_id == -1) {
1002 unit_id = 0;
1003 while (drive_get(type, bus_id, unit_id) != NULL) {
1004 unit_id++;
1005 if (max_devs && unit_id >= max_devs) {
1006 unit_id -= max_devs;
1007 bus_id++;
1008 }
1009 }
1010 }
1011
1012 if (max_devs && unit_id >= max_devs) {
1013 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1014 goto fail;
1015 }
1016
1017 if (drive_get(type, bus_id, unit_id) != NULL) {
1018 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1019 bus_id, unit_id, index);
1020 goto fail;
1021 }
1022
1023 /* Serial number */
1024 serial = qemu_opt_get(legacy_opts, "serial");
1025
1026 /* no id supplied -> create one */
1027 if (qemu_opts_id(all_opts) == NULL) {
1028 char *new_id;
1029 const char *mediastr = "";
1030 if (type == IF_IDE || type == IF_SCSI) {
1031 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1032 }
1033 if (max_devs) {
1034 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1035 mediastr, unit_id);
1036 } else {
1037 new_id = g_strdup_printf("%s%s%i", if_name[type],
1038 mediastr, unit_id);
1039 }
1040 qdict_put_str(bs_opts, "id", new_id);
1041 g_free(new_id);
1042 }
1043
1044 /* Add virtio block device */
1045 devaddr = qemu_opt_get(legacy_opts, "addr");
1046 if (devaddr && type != IF_VIRTIO) {
1047 error_report("addr is not supported by this bus type");
1048 goto fail;
1049 }
1050
1051 if (type == IF_VIRTIO) {
1052 QemuOpts *devopts;
1053 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1054 &error_abort);
1055 if (arch_type == QEMU_ARCH_S390X) {
1056 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1057 } else {
1058 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1059 }
1060 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1061 &error_abort);
1062 if (devaddr) {
1063 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1064 }
1065 }
1066
1067 filename = qemu_opt_get(legacy_opts, "file");
1068
1069 /* Check werror/rerror compatibility with if=... */
1070 werror = qemu_opt_get(legacy_opts, "werror");
1071 if (werror != NULL) {
1072 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1073 type != IF_NONE) {
1074 error_report("werror is not supported by this bus type");
1075 goto fail;
1076 }
1077 qdict_put_str(bs_opts, "werror", werror);
1078 }
1079
1080 rerror = qemu_opt_get(legacy_opts, "rerror");
1081 if (rerror != NULL) {
1082 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1083 type != IF_NONE) {
1084 error_report("rerror is not supported by this bus type");
1085 goto fail;
1086 }
1087 qdict_put_str(bs_opts, "rerror", rerror);
1088 }
1089
1090 /* Actual block device init: Functionality shared with blockdev-add */
1091 blk = blockdev_init(filename, bs_opts, &local_err);
1092 bs_opts = NULL;
1093 if (!blk) {
1094 if (local_err) {
1095 error_report_err(local_err);
1096 }
1097 goto fail;
1098 } else {
1099 assert(!local_err);
1100 }
1101
1102 /* Create legacy DriveInfo */
1103 dinfo = g_malloc0(sizeof(*dinfo));
1104 dinfo->opts = all_opts;
1105
1106 dinfo->cyls = cyls;
1107 dinfo->heads = heads;
1108 dinfo->secs = secs;
1109 dinfo->trans = translation;
1110
1111 dinfo->type = type;
1112 dinfo->bus = bus_id;
1113 dinfo->unit = unit_id;
1114 dinfo->devaddr = devaddr;
1115 dinfo->serial = g_strdup(serial);
1116
1117 blk_set_legacy_dinfo(blk, dinfo);
1118
1119 switch(type) {
1120 case IF_IDE:
1121 case IF_SCSI:
1122 case IF_XEN:
1123 case IF_NONE:
1124 dinfo->media_cd = media == MEDIA_CDROM;
1125 break;
1126 default:
1127 break;
1128 }
1129
1130 fail:
1131 qemu_opts_del(legacy_opts);
1132 QDECREF(bs_opts);
1133 return dinfo;
1134 }
1135
1136 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1137 {
1138 BlockDriverState *bs;
1139
1140 bs = bdrv_lookup_bs(name, name, errp);
1141 if (bs == NULL) {
1142 return NULL;
1143 }
1144
1145 if (!bdrv_is_root_node(bs)) {
1146 error_setg(errp, "Need a root block node");
1147 return NULL;
1148 }
1149
1150 if (!bdrv_is_inserted(bs)) {
1151 error_setg(errp, "Device has no medium");
1152 return NULL;
1153 }
1154
1155 return bs;
1156 }
1157
1158 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id,
1159 Error **errp)
1160 {
1161 BlockBackend *blk;
1162
1163 if (!blk_name == !qdev_id) {
1164 error_setg(errp, "Need exactly one of 'device' and 'id'");
1165 return NULL;
1166 }
1167
1168 if (qdev_id) {
1169 blk = blk_by_qdev_id(qdev_id, errp);
1170 } else {
1171 blk = blk_by_name(blk_name);
1172 if (blk == NULL) {
1173 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1174 "Device '%s' not found", blk_name);
1175 }
1176 }
1177
1178 return blk;
1179 }
1180
1181 void hmp_commit(Monitor *mon, const QDict *qdict)
1182 {
1183 const char *device = qdict_get_str(qdict, "device");
1184 BlockBackend *blk;
1185 int ret;
1186
1187 if (!strcmp(device, "all")) {
1188 ret = blk_commit_all();
1189 } else {
1190 BlockDriverState *bs;
1191 AioContext *aio_context;
1192
1193 blk = blk_by_name(device);
1194 if (!blk) {
1195 monitor_printf(mon, "Device '%s' not found\n", device);
1196 return;
1197 }
1198 if (!blk_is_available(blk)) {
1199 monitor_printf(mon, "Device '%s' has no medium\n", device);
1200 return;
1201 }
1202
1203 bs = blk_bs(blk);
1204 aio_context = bdrv_get_aio_context(bs);
1205 aio_context_acquire(aio_context);
1206
1207 ret = bdrv_commit(bs);
1208
1209 aio_context_release(aio_context);
1210 }
1211 if (ret < 0) {
1212 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1213 strerror(-ret));
1214 }
1215 }
1216
1217 static void blockdev_do_action(TransactionAction *action, Error **errp)
1218 {
1219 TransactionActionList list;
1220
1221 list.value = action;
1222 list.next = NULL;
1223 qmp_transaction(&list, false, NULL, errp);
1224 }
1225
1226 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1227 bool has_node_name, const char *node_name,
1228 const char *snapshot_file,
1229 bool has_snapshot_node_name,
1230 const char *snapshot_node_name,
1231 bool has_format, const char *format,
1232 bool has_mode, NewImageMode mode, Error **errp)
1233 {
1234 BlockdevSnapshotSync snapshot = {
1235 .has_device = has_device,
1236 .device = (char *) device,
1237 .has_node_name = has_node_name,
1238 .node_name = (char *) node_name,
1239 .snapshot_file = (char *) snapshot_file,
1240 .has_snapshot_node_name = has_snapshot_node_name,
1241 .snapshot_node_name = (char *) snapshot_node_name,
1242 .has_format = has_format,
1243 .format = (char *) format,
1244 .has_mode = has_mode,
1245 .mode = mode,
1246 };
1247 TransactionAction action = {
1248 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1249 .u.blockdev_snapshot_sync.data = &snapshot,
1250 };
1251 blockdev_do_action(&action, errp);
1252 }
1253
1254 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1255 Error **errp)
1256 {
1257 BlockdevSnapshot snapshot_data = {
1258 .node = (char *) node,
1259 .overlay = (char *) overlay
1260 };
1261 TransactionAction action = {
1262 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1263 .u.blockdev_snapshot.data = &snapshot_data,
1264 };
1265 blockdev_do_action(&action, errp);
1266 }
1267
1268 void qmp_blockdev_snapshot_internal_sync(const char *device,
1269 const char *name,
1270 Error **errp)
1271 {
1272 BlockdevSnapshotInternal snapshot = {
1273 .device = (char *) device,
1274 .name = (char *) name
1275 };
1276 TransactionAction action = {
1277 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1278 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1279 };
1280 blockdev_do_action(&action, errp);
1281 }
1282
1283 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1284 bool has_id,
1285 const char *id,
1286 bool has_name,
1287 const char *name,
1288 Error **errp)
1289 {
1290 BlockDriverState *bs;
1291 AioContext *aio_context;
1292 QEMUSnapshotInfo sn;
1293 Error *local_err = NULL;
1294 SnapshotInfo *info = NULL;
1295 int ret;
1296
1297 bs = qmp_get_root_bs(device, errp);
1298 if (!bs) {
1299 return NULL;
1300 }
1301 aio_context = bdrv_get_aio_context(bs);
1302 aio_context_acquire(aio_context);
1303
1304 if (!has_id) {
1305 id = NULL;
1306 }
1307
1308 if (!has_name) {
1309 name = NULL;
1310 }
1311
1312 if (!id && !name) {
1313 error_setg(errp, "Name or id must be provided");
1314 goto out_aio_context;
1315 }
1316
1317 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1318 goto out_aio_context;
1319 }
1320
1321 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1322 if (local_err) {
1323 error_propagate(errp, local_err);
1324 goto out_aio_context;
1325 }
1326 if (!ret) {
1327 error_setg(errp,
1328 "Snapshot with id '%s' and name '%s' does not exist on "
1329 "device '%s'",
1330 STR_OR_NULL(id), STR_OR_NULL(name), device);
1331 goto out_aio_context;
1332 }
1333
1334 bdrv_snapshot_delete(bs, id, name, &local_err);
1335 if (local_err) {
1336 error_propagate(errp, local_err);
1337 goto out_aio_context;
1338 }
1339
1340 aio_context_release(aio_context);
1341
1342 info = g_new0(SnapshotInfo, 1);
1343 info->id = g_strdup(sn.id_str);
1344 info->name = g_strdup(sn.name);
1345 info->date_nsec = sn.date_nsec;
1346 info->date_sec = sn.date_sec;
1347 info->vm_state_size = sn.vm_state_size;
1348 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1349 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1350
1351 return info;
1352
1353 out_aio_context:
1354 aio_context_release(aio_context);
1355 return NULL;
1356 }
1357
1358 /**
1359 * block_dirty_bitmap_lookup:
1360 * Return a dirty bitmap (if present), after validating
1361 * the node reference and bitmap names.
1362 *
1363 * @node: The name of the BDS node to search for bitmaps
1364 * @name: The name of the bitmap to search for
1365 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1366 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1367 * @errp: Output pointer for error information. Can be NULL.
1368 *
1369 * @return: A bitmap object on success, or NULL on failure.
1370 */
1371 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1372 const char *name,
1373 BlockDriverState **pbs,
1374 Error **errp)
1375 {
1376 BlockDriverState *bs;
1377 BdrvDirtyBitmap *bitmap;
1378
1379 if (!node) {
1380 error_setg(errp, "Node cannot be NULL");
1381 return NULL;
1382 }
1383 if (!name) {
1384 error_setg(errp, "Bitmap name cannot be NULL");
1385 return NULL;
1386 }
1387 bs = bdrv_lookup_bs(node, node, NULL);
1388 if (!bs) {
1389 error_setg(errp, "Node '%s' not found", node);
1390 return NULL;
1391 }
1392
1393 bitmap = bdrv_find_dirty_bitmap(bs, name);
1394 if (!bitmap) {
1395 error_setg(errp, "Dirty bitmap '%s' not found", name);
1396 return NULL;
1397 }
1398
1399 if (pbs) {
1400 *pbs = bs;
1401 }
1402
1403 return bitmap;
1404 }
1405
1406 /* New and old BlockDriverState structs for atomic group operations */
1407
1408 typedef struct BlkActionState BlkActionState;
1409
1410 /**
1411 * BlkActionOps:
1412 * Table of operations that define an Action.
1413 *
1414 * @instance_size: Size of state struct, in bytes.
1415 * @prepare: Prepare the work, must NOT be NULL.
1416 * @commit: Commit the changes, can be NULL.
1417 * @abort: Abort the changes on fail, can be NULL.
1418 * @clean: Clean up resources after all transaction actions have called
1419 * commit() or abort(). Can be NULL.
1420 *
1421 * Only prepare() may fail. In a single transaction, only one of commit() or
1422 * abort() will be called. clean() will always be called if it is present.
1423 */
1424 typedef struct BlkActionOps {
1425 size_t instance_size;
1426 void (*prepare)(BlkActionState *common, Error **errp);
1427 void (*commit)(BlkActionState *common);
1428 void (*abort)(BlkActionState *common);
1429 void (*clean)(BlkActionState *common);
1430 } BlkActionOps;
1431
1432 /**
1433 * BlkActionState:
1434 * Describes one Action's state within a Transaction.
1435 *
1436 * @action: QAPI-defined enum identifying which Action to perform.
1437 * @ops: Table of ActionOps this Action can perform.
1438 * @block_job_txn: Transaction which this action belongs to.
1439 * @entry: List membership for all Actions in this Transaction.
1440 *
1441 * This structure must be arranged as first member in a subclassed type,
1442 * assuming that the compiler will also arrange it to the same offsets as the
1443 * base class.
1444 */
1445 struct BlkActionState {
1446 TransactionAction *action;
1447 const BlkActionOps *ops;
1448 BlockJobTxn *block_job_txn;
1449 TransactionProperties *txn_props;
1450 QSIMPLEQ_ENTRY(BlkActionState) entry;
1451 };
1452
1453 /* internal snapshot private data */
1454 typedef struct InternalSnapshotState {
1455 BlkActionState common;
1456 BlockDriverState *bs;
1457 QEMUSnapshotInfo sn;
1458 bool created;
1459 } InternalSnapshotState;
1460
1461
1462 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1463 {
1464 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1465 error_setg(errp,
1466 "Action '%s' does not support Transaction property "
1467 "completion-mode = %s",
1468 TransactionActionKind_str(s->action->type),
1469 ActionCompletionMode_str(s->txn_props->completion_mode));
1470 return -1;
1471 }
1472 return 0;
1473 }
1474
1475 static void internal_snapshot_prepare(BlkActionState *common,
1476 Error **errp)
1477 {
1478 Error *local_err = NULL;
1479 const char *device;
1480 const char *name;
1481 BlockDriverState *bs;
1482 QEMUSnapshotInfo old_sn, *sn;
1483 bool ret;
1484 qemu_timeval tv;
1485 BlockdevSnapshotInternal *internal;
1486 InternalSnapshotState *state;
1487 AioContext *aio_context;
1488 int ret1;
1489
1490 g_assert(common->action->type ==
1491 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1492 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1493 state = DO_UPCAST(InternalSnapshotState, common, common);
1494
1495 /* 1. parse input */
1496 device = internal->device;
1497 name = internal->name;
1498
1499 /* 2. check for validation */
1500 if (action_check_completion_mode(common, errp) < 0) {
1501 return;
1502 }
1503
1504 bs = qmp_get_root_bs(device, errp);
1505 if (!bs) {
1506 return;
1507 }
1508
1509 aio_context = bdrv_get_aio_context(bs);
1510 aio_context_acquire(aio_context);
1511
1512 state->bs = bs;
1513
1514 /* Paired with .clean() */
1515 bdrv_drained_begin(bs);
1516
1517 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1518 goto out;
1519 }
1520
1521 if (bdrv_is_read_only(bs)) {
1522 error_setg(errp, "Device '%s' is read only", device);
1523 goto out;
1524 }
1525
1526 if (!bdrv_can_snapshot(bs)) {
1527 error_setg(errp, "Block format '%s' used by device '%s' "
1528 "does not support internal snapshots",
1529 bs->drv->format_name, device);
1530 goto out;
1531 }
1532
1533 if (!strlen(name)) {
1534 error_setg(errp, "Name is empty");
1535 goto out;
1536 }
1537
1538 /* check whether a snapshot with name exist */
1539 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1540 &local_err);
1541 if (local_err) {
1542 error_propagate(errp, local_err);
1543 goto out;
1544 } else if (ret) {
1545 error_setg(errp,
1546 "Snapshot with name '%s' already exists on device '%s'",
1547 name, device);
1548 goto out;
1549 }
1550
1551 /* 3. take the snapshot */
1552 sn = &state->sn;
1553 pstrcpy(sn->name, sizeof(sn->name), name);
1554 qemu_gettimeofday(&tv);
1555 sn->date_sec = tv.tv_sec;
1556 sn->date_nsec = tv.tv_usec * 1000;
1557 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1558
1559 ret1 = bdrv_snapshot_create(bs, sn);
1560 if (ret1 < 0) {
1561 error_setg_errno(errp, -ret1,
1562 "Failed to create snapshot '%s' on device '%s'",
1563 name, device);
1564 goto out;
1565 }
1566
1567 /* 4. succeed, mark a snapshot is created */
1568 state->created = true;
1569
1570 out:
1571 aio_context_release(aio_context);
1572 }
1573
1574 static void internal_snapshot_abort(BlkActionState *common)
1575 {
1576 InternalSnapshotState *state =
1577 DO_UPCAST(InternalSnapshotState, common, common);
1578 BlockDriverState *bs = state->bs;
1579 QEMUSnapshotInfo *sn = &state->sn;
1580 AioContext *aio_context;
1581 Error *local_error = NULL;
1582
1583 if (!state->created) {
1584 return;
1585 }
1586
1587 aio_context = bdrv_get_aio_context(state->bs);
1588 aio_context_acquire(aio_context);
1589
1590 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1591 error_reportf_err(local_error,
1592 "Failed to delete snapshot with id '%s' and "
1593 "name '%s' on device '%s' in abort: ",
1594 sn->id_str, sn->name,
1595 bdrv_get_device_name(bs));
1596 }
1597
1598 aio_context_release(aio_context);
1599 }
1600
1601 static void internal_snapshot_clean(BlkActionState *common)
1602 {
1603 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1604 common, common);
1605 AioContext *aio_context;
1606
1607 if (!state->bs) {
1608 return;
1609 }
1610
1611 aio_context = bdrv_get_aio_context(state->bs);
1612 aio_context_acquire(aio_context);
1613
1614 bdrv_drained_end(state->bs);
1615
1616 aio_context_release(aio_context);
1617 }
1618
1619 /* external snapshot private data */
1620 typedef struct ExternalSnapshotState {
1621 BlkActionState common;
1622 BlockDriverState *old_bs;
1623 BlockDriverState *new_bs;
1624 bool overlay_appended;
1625 } ExternalSnapshotState;
1626
1627 static void external_snapshot_prepare(BlkActionState *common,
1628 Error **errp)
1629 {
1630 int flags = 0;
1631 QDict *options = NULL;
1632 Error *local_err = NULL;
1633 /* Device and node name of the image to generate the snapshot from */
1634 const char *device;
1635 const char *node_name;
1636 /* Reference to the new image (for 'blockdev-snapshot') */
1637 const char *snapshot_ref;
1638 /* File name of the new image (for 'blockdev-snapshot-sync') */
1639 const char *new_image_file;
1640 ExternalSnapshotState *state =
1641 DO_UPCAST(ExternalSnapshotState, common, common);
1642 TransactionAction *action = common->action;
1643 AioContext *aio_context;
1644
1645 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1646 * purpose but a different set of parameters */
1647 switch (action->type) {
1648 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1649 {
1650 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1651 device = s->node;
1652 node_name = s->node;
1653 new_image_file = NULL;
1654 snapshot_ref = s->overlay;
1655 }
1656 break;
1657 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1658 {
1659 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1660 device = s->has_device ? s->device : NULL;
1661 node_name = s->has_node_name ? s->node_name : NULL;
1662 new_image_file = s->snapshot_file;
1663 snapshot_ref = NULL;
1664 }
1665 break;
1666 default:
1667 g_assert_not_reached();
1668 }
1669
1670 /* start processing */
1671 if (action_check_completion_mode(common, errp) < 0) {
1672 return;
1673 }
1674
1675 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1676 if (!state->old_bs) {
1677 return;
1678 }
1679
1680 aio_context = bdrv_get_aio_context(state->old_bs);
1681 aio_context_acquire(aio_context);
1682
1683 /* Paired with .clean() */
1684 bdrv_drained_begin(state->old_bs);
1685
1686 if (!bdrv_is_inserted(state->old_bs)) {
1687 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1688 goto out;
1689 }
1690
1691 if (bdrv_op_is_blocked(state->old_bs,
1692 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1693 goto out;
1694 }
1695
1696 if (!bdrv_is_read_only(state->old_bs)) {
1697 if (bdrv_flush(state->old_bs)) {
1698 error_setg(errp, QERR_IO_ERROR);
1699 goto out;
1700 }
1701 }
1702
1703 if (!bdrv_is_first_non_filter(state->old_bs)) {
1704 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1705 goto out;
1706 }
1707
1708 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1709 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1710 const char *format = s->has_format ? s->format : "qcow2";
1711 enum NewImageMode mode;
1712 const char *snapshot_node_name =
1713 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1714
1715 if (node_name && !snapshot_node_name) {
1716 error_setg(errp, "New snapshot node name missing");
1717 goto out;
1718 }
1719
1720 if (snapshot_node_name &&
1721 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1722 error_setg(errp, "New snapshot node name already in use");
1723 goto out;
1724 }
1725
1726 flags = state->old_bs->open_flags;
1727 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1728 flags |= BDRV_O_NO_BACKING;
1729
1730 /* create new image w/backing file */
1731 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1732 if (mode != NEW_IMAGE_MODE_EXISTING) {
1733 int64_t size = bdrv_getlength(state->old_bs);
1734 if (size < 0) {
1735 error_setg_errno(errp, -size, "bdrv_getlength failed");
1736 goto out;
1737 }
1738 bdrv_img_create(new_image_file, format,
1739 state->old_bs->filename,
1740 state->old_bs->drv->format_name,
1741 NULL, size, flags, false, &local_err);
1742 if (local_err) {
1743 error_propagate(errp, local_err);
1744 goto out;
1745 }
1746 }
1747
1748 options = qdict_new();
1749 if (s->has_snapshot_node_name) {
1750 qdict_put_str(options, "node-name", snapshot_node_name);
1751 }
1752 qdict_put_str(options, "driver", format);
1753 }
1754
1755 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1756 errp);
1757 /* We will manually add the backing_hd field to the bs later */
1758 if (!state->new_bs) {
1759 goto out;
1760 }
1761
1762 if (bdrv_has_blk(state->new_bs)) {
1763 error_setg(errp, "The snapshot is already in use");
1764 goto out;
1765 }
1766
1767 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1768 errp)) {
1769 goto out;
1770 }
1771
1772 if (state->new_bs->backing != NULL) {
1773 error_setg(errp, "The snapshot already has a backing image");
1774 goto out;
1775 }
1776
1777 if (!state->new_bs->drv->supports_backing) {
1778 error_setg(errp, "The snapshot does not support backing images");
1779 goto out;
1780 }
1781
1782 bdrv_set_aio_context(state->new_bs, aio_context);
1783
1784 /* This removes our old bs and adds the new bs. This is an operation that
1785 * can fail, so we need to do it in .prepare; undoing it for abort is
1786 * always possible. */
1787 bdrv_ref(state->new_bs);
1788 bdrv_append(state->new_bs, state->old_bs, &local_err);
1789 if (local_err) {
1790 error_propagate(errp, local_err);
1791 goto out;
1792 }
1793 state->overlay_appended = true;
1794
1795 out:
1796 aio_context_release(aio_context);
1797 }
1798
1799 static void external_snapshot_commit(BlkActionState *common)
1800 {
1801 ExternalSnapshotState *state =
1802 DO_UPCAST(ExternalSnapshotState, common, common);
1803 AioContext *aio_context;
1804
1805 aio_context = bdrv_get_aio_context(state->old_bs);
1806 aio_context_acquire(aio_context);
1807
1808 /* We don't need (or want) to use the transactional
1809 * bdrv_reopen_multiple() across all the entries at once, because we
1810 * don't want to abort all of them if one of them fails the reopen */
1811 if (!atomic_read(&state->old_bs->copy_on_read)) {
1812 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1813 NULL);
1814 }
1815
1816 aio_context_release(aio_context);
1817 }
1818
1819 static void external_snapshot_abort(BlkActionState *common)
1820 {
1821 ExternalSnapshotState *state =
1822 DO_UPCAST(ExternalSnapshotState, common, common);
1823 if (state->new_bs) {
1824 if (state->overlay_appended) {
1825 AioContext *aio_context;
1826
1827 aio_context = bdrv_get_aio_context(state->old_bs);
1828 aio_context_acquire(aio_context);
1829
1830 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1831 close state->old_bs; we need it */
1832 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1833 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1834 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1835
1836 aio_context_release(aio_context);
1837 }
1838 }
1839 }
1840
1841 static void external_snapshot_clean(BlkActionState *common)
1842 {
1843 ExternalSnapshotState *state =
1844 DO_UPCAST(ExternalSnapshotState, common, common);
1845 AioContext *aio_context;
1846
1847 if (!state->old_bs) {
1848 return;
1849 }
1850
1851 aio_context = bdrv_get_aio_context(state->old_bs);
1852 aio_context_acquire(aio_context);
1853
1854 bdrv_drained_end(state->old_bs);
1855 bdrv_unref(state->new_bs);
1856
1857 aio_context_release(aio_context);
1858 }
1859
1860 typedef struct DriveBackupState {
1861 BlkActionState common;
1862 BlockDriverState *bs;
1863 BlockJob *job;
1864 } DriveBackupState;
1865
1866 static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
1867 Error **errp);
1868
1869 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1870 {
1871 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1872 BlockDriverState *bs;
1873 DriveBackup *backup;
1874 AioContext *aio_context;
1875 Error *local_err = NULL;
1876
1877 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1878 backup = common->action->u.drive_backup.data;
1879
1880 bs = qmp_get_root_bs(backup->device, errp);
1881 if (!bs) {
1882 return;
1883 }
1884
1885 aio_context = bdrv_get_aio_context(bs);
1886 aio_context_acquire(aio_context);
1887
1888 /* Paired with .clean() */
1889 bdrv_drained_begin(bs);
1890
1891 state->bs = bs;
1892
1893 state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
1894 if (local_err) {
1895 error_propagate(errp, local_err);
1896 goto out;
1897 }
1898
1899 out:
1900 aio_context_release(aio_context);
1901 }
1902
1903 static void drive_backup_commit(BlkActionState *common)
1904 {
1905 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1906 AioContext *aio_context;
1907
1908 aio_context = bdrv_get_aio_context(state->bs);
1909 aio_context_acquire(aio_context);
1910
1911 assert(state->job);
1912 block_job_start(state->job);
1913
1914 aio_context_release(aio_context);
1915 }
1916
1917 static void drive_backup_abort(BlkActionState *common)
1918 {
1919 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1920
1921 if (state->job) {
1922 AioContext *aio_context;
1923
1924 aio_context = bdrv_get_aio_context(state->bs);
1925 aio_context_acquire(aio_context);
1926
1927 block_job_cancel_sync(state->job);
1928
1929 aio_context_release(aio_context);
1930 }
1931 }
1932
1933 static void drive_backup_clean(BlkActionState *common)
1934 {
1935 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1936 AioContext *aio_context;
1937
1938 if (!state->bs) {
1939 return;
1940 }
1941
1942 aio_context = bdrv_get_aio_context(state->bs);
1943 aio_context_acquire(aio_context);
1944
1945 bdrv_drained_end(state->bs);
1946
1947 aio_context_release(aio_context);
1948 }
1949
1950 typedef struct BlockdevBackupState {
1951 BlkActionState common;
1952 BlockDriverState *bs;
1953 BlockJob *job;
1954 } BlockdevBackupState;
1955
1956 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn,
1957 Error **errp);
1958
1959 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1960 {
1961 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1962 BlockdevBackup *backup;
1963 BlockDriverState *bs, *target;
1964 AioContext *aio_context;
1965 Error *local_err = NULL;
1966
1967 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1968 backup = common->action->u.blockdev_backup.data;
1969
1970 bs = qmp_get_root_bs(backup->device, errp);
1971 if (!bs) {
1972 return;
1973 }
1974
1975 target = bdrv_lookup_bs(backup->target, backup->target, errp);
1976 if (!target) {
1977 return;
1978 }
1979
1980 aio_context = bdrv_get_aio_context(bs);
1981 if (aio_context != bdrv_get_aio_context(target)) {
1982 error_setg(errp, "Backup between two IO threads is not implemented");
1983 return;
1984 }
1985 aio_context_acquire(aio_context);
1986 state->bs = bs;
1987
1988 /* Paired with .clean() */
1989 bdrv_drained_begin(state->bs);
1990
1991 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
1992 if (local_err) {
1993 error_propagate(errp, local_err);
1994 goto out;
1995 }
1996
1997 out:
1998 aio_context_release(aio_context);
1999 }
2000
2001 static void blockdev_backup_commit(BlkActionState *common)
2002 {
2003 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2004 AioContext *aio_context;
2005
2006 aio_context = bdrv_get_aio_context(state->bs);
2007 aio_context_acquire(aio_context);
2008
2009 assert(state->job);
2010 block_job_start(state->job);
2011
2012 aio_context_release(aio_context);
2013 }
2014
2015 static void blockdev_backup_abort(BlkActionState *common)
2016 {
2017 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2018
2019 if (state->job) {
2020 AioContext *aio_context;
2021
2022 aio_context = bdrv_get_aio_context(state->bs);
2023 aio_context_acquire(aio_context);
2024
2025 block_job_cancel_sync(state->job);
2026
2027 aio_context_release(aio_context);
2028 }
2029 }
2030
2031 static void blockdev_backup_clean(BlkActionState *common)
2032 {
2033 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2034 AioContext *aio_context;
2035
2036 if (!state->bs) {
2037 return;
2038 }
2039
2040 aio_context = bdrv_get_aio_context(state->bs);
2041 aio_context_acquire(aio_context);
2042
2043 bdrv_drained_end(state->bs);
2044
2045 aio_context_release(aio_context);
2046 }
2047
2048 typedef struct BlockDirtyBitmapState {
2049 BlkActionState common;
2050 BdrvDirtyBitmap *bitmap;
2051 BlockDriverState *bs;
2052 HBitmap *backup;
2053 bool prepared;
2054 } BlockDirtyBitmapState;
2055
2056 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2057 Error **errp)
2058 {
2059 Error *local_err = NULL;
2060 BlockDirtyBitmapAdd *action;
2061 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2062 common, common);
2063
2064 if (action_check_completion_mode(common, errp) < 0) {
2065 return;
2066 }
2067
2068 action = common->action->u.block_dirty_bitmap_add.data;
2069 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2070 qmp_block_dirty_bitmap_add(action->node, action->name,
2071 action->has_granularity, action->granularity,
2072 action->has_persistent, action->persistent,
2073 action->has_autoload, action->autoload,
2074 &local_err);
2075
2076 if (!local_err) {
2077 state->prepared = true;
2078 } else {
2079 error_propagate(errp, local_err);
2080 }
2081 }
2082
2083 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2084 {
2085 BlockDirtyBitmapAdd *action;
2086 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2087 common, common);
2088
2089 action = common->action->u.block_dirty_bitmap_add.data;
2090 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2091 * then the node reference and bitmap name must have been valid.
2092 */
2093 if (state->prepared) {
2094 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2095 }
2096 }
2097
2098 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2099 Error **errp)
2100 {
2101 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2102 common, common);
2103 BlockDirtyBitmap *action;
2104
2105 if (action_check_completion_mode(common, errp) < 0) {
2106 return;
2107 }
2108
2109 action = common->action->u.block_dirty_bitmap_clear.data;
2110 state->bitmap = block_dirty_bitmap_lookup(action->node,
2111 action->name,
2112 &state->bs,
2113 errp);
2114 if (!state->bitmap) {
2115 return;
2116 }
2117
2118 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2119 error_setg(errp, "Cannot modify a frozen bitmap");
2120 return;
2121 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2122 error_setg(errp, "Cannot clear a disabled bitmap");
2123 return;
2124 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
2125 error_setg(errp, "Cannot clear a readonly bitmap");
2126 return;
2127 }
2128
2129 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2130 }
2131
2132 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2133 {
2134 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2135 common, common);
2136
2137 if (state->backup) {
2138 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2139 }
2140 }
2141
2142 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2143 {
2144 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2145 common, common);
2146
2147 hbitmap_free(state->backup);
2148 }
2149
2150 static void abort_prepare(BlkActionState *common, Error **errp)
2151 {
2152 error_setg(errp, "Transaction aborted using Abort action");
2153 }
2154
2155 static void abort_commit(BlkActionState *common)
2156 {
2157 g_assert_not_reached(); /* this action never succeeds */
2158 }
2159
2160 static const BlkActionOps actions[] = {
2161 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2162 .instance_size = sizeof(ExternalSnapshotState),
2163 .prepare = external_snapshot_prepare,
2164 .commit = external_snapshot_commit,
2165 .abort = external_snapshot_abort,
2166 .clean = external_snapshot_clean,
2167 },
2168 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2169 .instance_size = sizeof(ExternalSnapshotState),
2170 .prepare = external_snapshot_prepare,
2171 .commit = external_snapshot_commit,
2172 .abort = external_snapshot_abort,
2173 .clean = external_snapshot_clean,
2174 },
2175 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2176 .instance_size = sizeof(DriveBackupState),
2177 .prepare = drive_backup_prepare,
2178 .commit = drive_backup_commit,
2179 .abort = drive_backup_abort,
2180 .clean = drive_backup_clean,
2181 },
2182 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2183 .instance_size = sizeof(BlockdevBackupState),
2184 .prepare = blockdev_backup_prepare,
2185 .commit = blockdev_backup_commit,
2186 .abort = blockdev_backup_abort,
2187 .clean = blockdev_backup_clean,
2188 },
2189 [TRANSACTION_ACTION_KIND_ABORT] = {
2190 .instance_size = sizeof(BlkActionState),
2191 .prepare = abort_prepare,
2192 .commit = abort_commit,
2193 },
2194 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2195 .instance_size = sizeof(InternalSnapshotState),
2196 .prepare = internal_snapshot_prepare,
2197 .abort = internal_snapshot_abort,
2198 .clean = internal_snapshot_clean,
2199 },
2200 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2201 .instance_size = sizeof(BlockDirtyBitmapState),
2202 .prepare = block_dirty_bitmap_add_prepare,
2203 .abort = block_dirty_bitmap_add_abort,
2204 },
2205 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2206 .instance_size = sizeof(BlockDirtyBitmapState),
2207 .prepare = block_dirty_bitmap_clear_prepare,
2208 .commit = block_dirty_bitmap_clear_commit,
2209 .abort = block_dirty_bitmap_clear_abort,
2210 }
2211 };
2212
2213 /**
2214 * Allocate a TransactionProperties structure if necessary, and fill
2215 * that structure with desired defaults if they are unset.
2216 */
2217 static TransactionProperties *get_transaction_properties(
2218 TransactionProperties *props)
2219 {
2220 if (!props) {
2221 props = g_new0(TransactionProperties, 1);
2222 }
2223
2224 if (!props->has_completion_mode) {
2225 props->has_completion_mode = true;
2226 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2227 }
2228
2229 return props;
2230 }
2231
2232 /*
2233 * 'Atomic' group operations. The operations are performed as a set, and if
2234 * any fail then we roll back all operations in the group.
2235 */
2236 void qmp_transaction(TransactionActionList *dev_list,
2237 bool has_props,
2238 struct TransactionProperties *props,
2239 Error **errp)
2240 {
2241 TransactionActionList *dev_entry = dev_list;
2242 BlockJobTxn *block_job_txn = NULL;
2243 BlkActionState *state, *next;
2244 Error *local_err = NULL;
2245
2246 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2247 QSIMPLEQ_INIT(&snap_bdrv_states);
2248
2249 /* Does this transaction get canceled as a group on failure?
2250 * If not, we don't really need to make a BlockJobTxn.
2251 */
2252 props = get_transaction_properties(props);
2253 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2254 block_job_txn = block_job_txn_new();
2255 }
2256
2257 /* drain all i/o before any operations */
2258 bdrv_drain_all();
2259
2260 /* We don't do anything in this loop that commits us to the operations */
2261 while (NULL != dev_entry) {
2262 TransactionAction *dev_info = NULL;
2263 const BlkActionOps *ops;
2264
2265 dev_info = dev_entry->value;
2266 dev_entry = dev_entry->next;
2267
2268 assert(dev_info->type < ARRAY_SIZE(actions));
2269
2270 ops = &actions[dev_info->type];
2271 assert(ops->instance_size > 0);
2272
2273 state = g_malloc0(ops->instance_size);
2274 state->ops = ops;
2275 state->action = dev_info;
2276 state->block_job_txn = block_job_txn;
2277 state->txn_props = props;
2278 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2279
2280 state->ops->prepare(state, &local_err);
2281 if (local_err) {
2282 error_propagate(errp, local_err);
2283 goto delete_and_fail;
2284 }
2285 }
2286
2287 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2288 if (state->ops->commit) {
2289 state->ops->commit(state);
2290 }
2291 }
2292
2293 /* success */
2294 goto exit;
2295
2296 delete_and_fail:
2297 /* failure, and it is all-or-none; roll back all operations */
2298 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2299 if (state->ops->abort) {
2300 state->ops->abort(state);
2301 }
2302 }
2303 exit:
2304 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2305 if (state->ops->clean) {
2306 state->ops->clean(state);
2307 }
2308 g_free(state);
2309 }
2310 if (!has_props) {
2311 qapi_free_TransactionProperties(props);
2312 }
2313 block_job_txn_unref(block_job_txn);
2314 }
2315
2316 void qmp_eject(bool has_device, const char *device,
2317 bool has_id, const char *id,
2318 bool has_force, bool force, Error **errp)
2319 {
2320 Error *local_err = NULL;
2321 int rc;
2322
2323 if (!has_force) {
2324 force = false;
2325 }
2326
2327 rc = do_open_tray(has_device ? device : NULL,
2328 has_id ? id : NULL,
2329 force, &local_err);
2330 if (rc && rc != -ENOSYS) {
2331 error_propagate(errp, local_err);
2332 return;
2333 }
2334 error_free(local_err);
2335
2336 blockdev_remove_medium(has_device, device, has_id, id, errp);
2337 }
2338
2339 void qmp_block_passwd(bool has_device, const char *device,
2340 bool has_node_name, const char *node_name,
2341 const char *password, Error **errp)
2342 {
2343 error_setg(errp,
2344 "Setting block passwords directly is no longer supported");
2345 }
2346
2347 /*
2348 * Attempt to open the tray of @device.
2349 * If @force, ignore its tray lock.
2350 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2351 * On error, store an error through @errp and return -errno.
2352 * If @device does not exist, return -ENODEV.
2353 * If it has no removable media, return -ENOTSUP.
2354 * If it has no tray, return -ENOSYS.
2355 * If the guest was asked to open the tray, return -EINPROGRESS.
2356 * Else, return 0.
2357 */
2358 static int do_open_tray(const char *blk_name, const char *qdev_id,
2359 bool force, Error **errp)
2360 {
2361 BlockBackend *blk;
2362 const char *device = qdev_id ?: blk_name;
2363 bool locked;
2364
2365 blk = qmp_get_blk(blk_name, qdev_id, errp);
2366 if (!blk) {
2367 return -ENODEV;
2368 }
2369
2370 if (!blk_dev_has_removable_media(blk)) {
2371 error_setg(errp, "Device '%s' is not removable", device);
2372 return -ENOTSUP;
2373 }
2374
2375 if (!blk_dev_has_tray(blk)) {
2376 error_setg(errp, "Device '%s' does not have a tray", device);
2377 return -ENOSYS;
2378 }
2379
2380 if (blk_dev_is_tray_open(blk)) {
2381 return 0;
2382 }
2383
2384 locked = blk_dev_is_medium_locked(blk);
2385 if (locked) {
2386 blk_dev_eject_request(blk, force);
2387 }
2388
2389 if (!locked || force) {
2390 blk_dev_change_media_cb(blk, false, &error_abort);
2391 }
2392
2393 if (locked && !force) {
2394 error_setg(errp, "Device '%s' is locked and force was not specified, "
2395 "wait for tray to open and try again", device);
2396 return -EINPROGRESS;
2397 }
2398
2399 return 0;
2400 }
2401
2402 void qmp_blockdev_open_tray(bool has_device, const char *device,
2403 bool has_id, const char *id,
2404 bool has_force, bool force,
2405 Error **errp)
2406 {
2407 Error *local_err = NULL;
2408 int rc;
2409
2410 if (!has_force) {
2411 force = false;
2412 }
2413 rc = do_open_tray(has_device ? device : NULL,
2414 has_id ? id : NULL,
2415 force, &local_err);
2416 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
2417 error_propagate(errp, local_err);
2418 return;
2419 }
2420 error_free(local_err);
2421 }
2422
2423 void qmp_blockdev_close_tray(bool has_device, const char *device,
2424 bool has_id, const char *id,
2425 Error **errp)
2426 {
2427 BlockBackend *blk;
2428 Error *local_err = NULL;
2429
2430 device = has_device ? device : NULL;
2431 id = has_id ? id : NULL;
2432
2433 blk = qmp_get_blk(device, id, errp);
2434 if (!blk) {
2435 return;
2436 }
2437
2438 if (!blk_dev_has_removable_media(blk)) {
2439 error_setg(errp, "Device '%s' is not removable", device ?: id);
2440 return;
2441 }
2442
2443 if (!blk_dev_has_tray(blk)) {
2444 /* Ignore this command on tray-less devices */
2445 return;
2446 }
2447
2448 if (!blk_dev_is_tray_open(blk)) {
2449 return;
2450 }
2451
2452 blk_dev_change_media_cb(blk, true, &local_err);
2453 if (local_err) {
2454 error_propagate(errp, local_err);
2455 return;
2456 }
2457 }
2458
2459 static void blockdev_remove_medium(bool has_device, const char *device,
2460 bool has_id, const char *id, Error **errp)
2461 {
2462 BlockBackend *blk;
2463 BlockDriverState *bs;
2464 AioContext *aio_context;
2465 bool has_attached_device;
2466
2467 device = has_device ? device : NULL;
2468 id = has_id ? id : NULL;
2469
2470 blk = qmp_get_blk(device, id, errp);
2471 if (!blk) {
2472 return;
2473 }
2474
2475 /* For BBs without a device, we can exchange the BDS tree at will */
2476 has_attached_device = blk_get_attached_dev(blk);
2477
2478 if (has_attached_device && !blk_dev_has_removable_media(blk)) {
2479 error_setg(errp, "Device '%s' is not removable", device ?: id);
2480 return;
2481 }
2482
2483 if (has_attached_device && blk_dev_has_tray(blk) &&
2484 !blk_dev_is_tray_open(blk))
2485 {
2486 error_setg(errp, "Tray of device '%s' is not open", device ?: id);
2487 return;
2488 }
2489
2490 bs = blk_bs(blk);
2491 if (!bs) {
2492 return;
2493 }
2494
2495 aio_context = bdrv_get_aio_context(bs);
2496 aio_context_acquire(aio_context);
2497
2498 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2499 goto out;
2500 }
2501
2502 blk_remove_bs(blk);
2503
2504 if (!blk_dev_has_tray(blk)) {
2505 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2506 * called at all); therefore, the medium needs to be ejected here.
2507 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2508 * value passed here (i.e. false). */
2509 blk_dev_change_media_cb(blk, false, &error_abort);
2510 }
2511
2512 out:
2513 aio_context_release(aio_context);
2514 }
2515
2516 void qmp_blockdev_remove_medium(const char *id, Error **errp)
2517 {
2518 blockdev_remove_medium(false, NULL, true, id, errp);
2519 }
2520
2521 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2522 BlockDriverState *bs, Error **errp)
2523 {
2524 Error *local_err = NULL;
2525 bool has_device;
2526 int ret;
2527
2528 /* For BBs without a device, we can exchange the BDS tree at will */
2529 has_device = blk_get_attached_dev(blk);
2530
2531 if (has_device && !blk_dev_has_removable_media(blk)) {
2532 error_setg(errp, "Device is not removable");
2533 return;
2534 }
2535
2536 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2537 error_setg(errp, "Tray of the device is not open");
2538 return;
2539 }
2540
2541 if (blk_bs(blk)) {
2542 error_setg(errp, "There already is a medium in the device");
2543 return;
2544 }
2545
2546 ret = blk_insert_bs(blk, bs, errp);
2547 if (ret < 0) {
2548 return;
2549 }
2550
2551 if (!blk_dev_has_tray(blk)) {
2552 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2553 * called at all); therefore, the medium needs to be pushed into the
2554 * slot here.
2555 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2556 * value passed here (i.e. true). */
2557 blk_dev_change_media_cb(blk, true, &local_err);
2558 if (local_err) {
2559 error_propagate(errp, local_err);
2560 blk_remove_bs(blk);
2561 return;
2562 }
2563 }
2564 }
2565
2566 static void blockdev_insert_medium(bool has_device, const char *device,
2567 bool has_id, const char *id,
2568 const char *node_name, Error **errp)
2569 {
2570 BlockBackend *blk;
2571 BlockDriverState *bs;
2572
2573 blk = qmp_get_blk(has_device ? device : NULL,
2574 has_id ? id : NULL,
2575 errp);
2576 if (!blk) {
2577 return;
2578 }
2579
2580 bs = bdrv_find_node(node_name);
2581 if (!bs) {
2582 error_setg(errp, "Node '%s' not found", node_name);
2583 return;
2584 }
2585
2586 if (bdrv_has_blk(bs)) {
2587 error_setg(errp, "Node '%s' is already in use", node_name);
2588 return;
2589 }
2590
2591 qmp_blockdev_insert_anon_medium(blk, bs, errp);
2592 }
2593
2594 void qmp_blockdev_insert_medium(const char *id, const char *node_name,
2595 Error **errp)
2596 {
2597 blockdev_insert_medium(false, NULL, true, id, node_name, errp);
2598 }
2599
2600 void qmp_blockdev_change_medium(bool has_device, const char *device,
2601 bool has_id, const char *id,
2602 const char *filename,
2603 bool has_format, const char *format,
2604 bool has_read_only,
2605 BlockdevChangeReadOnlyMode read_only,
2606 Error **errp)
2607 {
2608 BlockBackend *blk;
2609 BlockDriverState *medium_bs = NULL;
2610 int bdrv_flags;
2611 bool detect_zeroes;
2612 int rc;
2613 QDict *options = NULL;
2614 Error *err = NULL;
2615
2616 blk = qmp_get_blk(has_device ? device : NULL,
2617 has_id ? id : NULL,
2618 errp);
2619 if (!blk) {
2620 goto fail;
2621 }
2622
2623 if (blk_bs(blk)) {
2624 blk_update_root_state(blk);
2625 }
2626
2627 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2628 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2629 BDRV_O_PROTOCOL);
2630
2631 if (!has_read_only) {
2632 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2633 }
2634
2635 switch (read_only) {
2636 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2637 break;
2638
2639 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2640 bdrv_flags &= ~BDRV_O_RDWR;
2641 break;
2642
2643 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2644 bdrv_flags |= BDRV_O_RDWR;
2645 break;
2646
2647 default:
2648 abort();
2649 }
2650
2651 options = qdict_new();
2652 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2653 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
2654
2655 if (has_format) {
2656 qdict_put_str(options, "driver", format);
2657 }
2658
2659 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
2660 if (!medium_bs) {
2661 goto fail;
2662 }
2663
2664 rc = do_open_tray(has_device ? device : NULL,
2665 has_id ? id : NULL,
2666 false, &err);
2667 if (rc && rc != -ENOSYS) {
2668 error_propagate(errp, err);
2669 goto fail;
2670 }
2671 error_free(err);
2672 err = NULL;
2673
2674 blockdev_remove_medium(has_device, device, has_id, id, &err);
2675 if (err) {
2676 error_propagate(errp, err);
2677 goto fail;
2678 }
2679
2680 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2681 if (err) {
2682 error_propagate(errp, err);
2683 goto fail;
2684 }
2685
2686 qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2687
2688 fail:
2689 /* If the medium has been inserted, the device has its own reference, so
2690 * ours must be relinquished; and if it has not been inserted successfully,
2691 * the reference must be relinquished anyway */
2692 bdrv_unref(medium_bs);
2693 }
2694
2695 /* throttling disk I/O limits */
2696 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2697 {
2698 ThrottleConfig cfg;
2699 BlockDriverState *bs;
2700 BlockBackend *blk;
2701 AioContext *aio_context;
2702
2703 blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
2704 arg->has_id ? arg->id : NULL,
2705 errp);
2706 if (!blk) {
2707 return;
2708 }
2709
2710 aio_context = blk_get_aio_context(blk);
2711 aio_context_acquire(aio_context);
2712
2713 bs = blk_bs(blk);
2714 if (!bs) {
2715 error_setg(errp, "Device has no medium");
2716 goto out;
2717 }
2718
2719 throttle_config_init(&cfg);
2720 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
2721 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd;
2722 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
2723
2724 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
2725 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd;
2726 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
2727
2728 if (arg->has_bps_max) {
2729 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2730 }
2731 if (arg->has_bps_rd_max) {
2732 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2733 }
2734 if (arg->has_bps_wr_max) {
2735 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2736 }
2737 if (arg->has_iops_max) {
2738 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2739 }
2740 if (arg->has_iops_rd_max) {
2741 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2742 }
2743 if (arg->has_iops_wr_max) {
2744 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2745 }
2746
2747 if (arg->has_bps_max_length) {
2748 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2749 }
2750 if (arg->has_bps_rd_max_length) {
2751 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2752 }
2753 if (arg->has_bps_wr_max_length) {
2754 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2755 }
2756 if (arg->has_iops_max_length) {
2757 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2758 }
2759 if (arg->has_iops_rd_max_length) {
2760 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2761 }
2762 if (arg->has_iops_wr_max_length) {
2763 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2764 }
2765
2766 if (arg->has_iops_size) {
2767 cfg.op_size = arg->iops_size;
2768 }
2769
2770 if (!throttle_is_valid(&cfg, errp)) {
2771 goto out;
2772 }
2773
2774 if (throttle_enabled(&cfg)) {
2775 /* Enable I/O limits if they're not enabled yet, otherwise
2776 * just update the throttling group. */
2777 if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
2778 blk_io_limits_enable(blk,
2779 arg->has_group ? arg->group :
2780 arg->has_device ? arg->device :
2781 arg->id);
2782 } else if (arg->has_group) {
2783 blk_io_limits_update_group(blk, arg->group);
2784 }
2785 /* Set the new throttling configuration */
2786 blk_set_io_limits(blk, &cfg);
2787 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
2788 /* If all throttling settings are set to 0, disable I/O limits */
2789 blk_io_limits_disable(blk);
2790 }
2791
2792 out:
2793 aio_context_release(aio_context);
2794 }
2795
2796 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2797 bool has_granularity, uint32_t granularity,
2798 bool has_persistent, bool persistent,
2799 bool has_autoload, bool autoload,
2800 Error **errp)
2801 {
2802 BlockDriverState *bs;
2803 BdrvDirtyBitmap *bitmap;
2804
2805 if (!name || name[0] == '\0') {
2806 error_setg(errp, "Bitmap name cannot be empty");
2807 return;
2808 }
2809
2810 bs = bdrv_lookup_bs(node, node, errp);
2811 if (!bs) {
2812 return;
2813 }
2814
2815 if (has_granularity) {
2816 if (granularity < 512 || !is_power_of_2(granularity)) {
2817 error_setg(errp, "Granularity must be power of 2 "
2818 "and at least 512");
2819 return;
2820 }
2821 } else {
2822 /* Default to cluster size, if available: */
2823 granularity = bdrv_get_default_bitmap_granularity(bs);
2824 }
2825
2826 if (!has_persistent) {
2827 persistent = false;
2828 }
2829
2830 if (has_autoload) {
2831 warn_report("Autoload option is deprecated and its value is ignored");
2832 }
2833
2834 if (persistent &&
2835 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
2836 {
2837 return;
2838 }
2839
2840 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2841 if (bitmap == NULL) {
2842 return;
2843 }
2844
2845 bdrv_dirty_bitmap_set_persistance(bitmap, persistent);
2846 }
2847
2848 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2849 Error **errp)
2850 {
2851 BlockDriverState *bs;
2852 BdrvDirtyBitmap *bitmap;
2853 Error *local_err = NULL;
2854
2855 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2856 if (!bitmap || !bs) {
2857 return;
2858 }
2859
2860 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2861 error_setg(errp,
2862 "Bitmap '%s' is currently frozen and cannot be removed",
2863 name);
2864 return;
2865 }
2866
2867 if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
2868 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
2869 if (local_err != NULL) {
2870 error_propagate(errp, local_err);
2871 return;
2872 }
2873 }
2874
2875 bdrv_dirty_bitmap_make_anon(bitmap);
2876 bdrv_release_dirty_bitmap(bs, bitmap);
2877 }
2878
2879 /**
2880 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2881 * immediately after a full backup operation.
2882 */
2883 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2884 Error **errp)
2885 {
2886 BdrvDirtyBitmap *bitmap;
2887 BlockDriverState *bs;
2888
2889 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2890 if (!bitmap || !bs) {
2891 return;
2892 }
2893
2894 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2895 error_setg(errp,
2896 "Bitmap '%s' is currently frozen and cannot be modified",
2897 name);
2898 return;
2899 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2900 error_setg(errp,
2901 "Bitmap '%s' is currently disabled and cannot be cleared",
2902 name);
2903 return;
2904 } else if (bdrv_dirty_bitmap_readonly(bitmap)) {
2905 error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name);
2906 return;
2907 }
2908
2909 bdrv_clear_dirty_bitmap(bitmap, NULL);
2910 }
2911
2912 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2913 const char *name,
2914 Error **errp)
2915 {
2916 BdrvDirtyBitmap *bitmap;
2917 BlockDriverState *bs;
2918 BlockDirtyBitmapSha256 *ret = NULL;
2919 char *sha256;
2920
2921 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2922 if (!bitmap || !bs) {
2923 return NULL;
2924 }
2925
2926 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2927 if (sha256 == NULL) {
2928 return NULL;
2929 }
2930
2931 ret = g_new(BlockDirtyBitmapSha256, 1);
2932 ret->sha256 = sha256;
2933
2934 return ret;
2935 }
2936
2937 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2938 {
2939 const char *id = qdict_get_str(qdict, "id");
2940 BlockBackend *blk;
2941 BlockDriverState *bs;
2942 AioContext *aio_context;
2943 Error *local_err = NULL;
2944
2945 bs = bdrv_find_node(id);
2946 if (bs) {
2947 qmp_blockdev_del(id, &local_err);
2948 if (local_err) {
2949 error_report_err(local_err);
2950 }
2951 return;
2952 }
2953
2954 blk = blk_by_name(id);
2955 if (!blk) {
2956 error_report("Device '%s' not found", id);
2957 return;
2958 }
2959
2960 if (!blk_legacy_dinfo(blk)) {
2961 error_report("Deleting device added with blockdev-add"
2962 " is not supported");
2963 return;
2964 }
2965
2966 aio_context = blk_get_aio_context(blk);
2967 aio_context_acquire(aio_context);
2968
2969 bs = blk_bs(blk);
2970 if (bs) {
2971 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2972 error_report_err(local_err);
2973 aio_context_release(aio_context);
2974 return;
2975 }
2976
2977 blk_remove_bs(blk);
2978 }
2979
2980 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2981 monitor_remove_blk(blk);
2982
2983 /* If this BlockBackend has a device attached to it, its refcount will be
2984 * decremented when the device is removed; otherwise we have to do so here.
2985 */
2986 if (blk_get_attached_dev(blk)) {
2987 /* Further I/O must not pause the guest */
2988 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2989 BLOCKDEV_ON_ERROR_REPORT);
2990 } else {
2991 blk_unref(blk);
2992 }
2993
2994 aio_context_release(aio_context);
2995 }
2996
2997 void qmp_block_resize(bool has_device, const char *device,
2998 bool has_node_name, const char *node_name,
2999 int64_t size, Error **errp)
3000 {
3001 Error *local_err = NULL;
3002 BlockBackend *blk = NULL;
3003 BlockDriverState *bs;
3004 AioContext *aio_context;
3005 int ret;
3006
3007 bs = bdrv_lookup_bs(has_device ? device : NULL,
3008 has_node_name ? node_name : NULL,
3009 &local_err);
3010 if (local_err) {
3011 error_propagate(errp, local_err);
3012 return;
3013 }
3014
3015 aio_context = bdrv_get_aio_context(bs);
3016 aio_context_acquire(aio_context);
3017
3018 if (!bdrv_is_first_non_filter(bs)) {
3019 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
3020 goto out;
3021 }
3022
3023 if (size < 0) {
3024 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
3025 goto out;
3026 }
3027
3028 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
3029 error_setg(errp, QERR_DEVICE_IN_USE, device);
3030 goto out;
3031 }
3032
3033 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
3034 ret = blk_insert_bs(blk, bs, errp);
3035 if (ret < 0) {
3036 goto out;
3037 }
3038
3039 bdrv_drained_begin(bs);
3040 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
3041 bdrv_drained_end(bs);
3042
3043 out:
3044 blk_unref(blk);
3045 aio_context_release(aio_context);
3046 }
3047
3048 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
3049 bool has_base, const char *base,
3050 bool has_base_node, const char *base_node,
3051 bool has_backing_file, const char *backing_file,
3052 bool has_speed, int64_t speed,
3053 bool has_on_error, BlockdevOnError on_error,
3054 Error **errp)
3055 {
3056 BlockDriverState *bs, *iter;
3057 BlockDriverState *base_bs = NULL;
3058 AioContext *aio_context;
3059 Error *local_err = NULL;
3060 const char *base_name = NULL;
3061
3062 if (!has_on_error) {
3063 on_error = BLOCKDEV_ON_ERROR_REPORT;
3064 }
3065
3066 bs = bdrv_lookup_bs(device, device, errp);
3067 if (!bs) {
3068 return;
3069 }
3070
3071 aio_context = bdrv_get_aio_context(bs);
3072 aio_context_acquire(aio_context);
3073
3074 if (has_base && has_base_node) {
3075 error_setg(errp, "'base' and 'base-node' cannot be specified "
3076 "at the same time");
3077 goto out;
3078 }
3079
3080 if (has_base) {
3081 base_bs = bdrv_find_backing_image(bs, base);
3082 if (base_bs == NULL) {
3083 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3084 goto out;
3085 }
3086 assert(bdrv_get_aio_context(base_bs) == aio_context);
3087 base_name = base;
3088 }
3089
3090 if (has_base_node) {
3091 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3092 if (!base_bs) {
3093 goto out;
3094 }
3095 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
3096 error_setg(errp, "Node '%s' is not a backing image of '%s'",
3097 base_node, device);
3098 goto out;
3099 }
3100 assert(bdrv_get_aio_context(base_bs) == aio_context);
3101 base_name = base_bs->filename;
3102 }
3103
3104 /* Check for op blockers in the whole chain between bs and base */
3105 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
3106 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
3107 goto out;
3108 }
3109 }
3110
3111 /* if we are streaming the entire chain, the result will have no backing
3112 * file, and specifying one is therefore an error */
3113 if (base_bs == NULL && has_backing_file) {
3114 error_setg(errp, "backing file specified, but streaming the "
3115 "entire chain");
3116 goto out;
3117 }
3118
3119 /* backing_file string overrides base bs filename */
3120 base_name = has_backing_file ? backing_file : base_name;
3121
3122 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
3123 has_speed ? speed : 0, on_error, &local_err);
3124 if (local_err) {
3125 error_propagate(errp, local_err);
3126 goto out;
3127 }
3128
3129 trace_qmp_block_stream(bs, bs->job);
3130
3131 out:
3132 aio_context_release(aio_context);
3133 }
3134
3135 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3136 bool has_base, const char *base,
3137 bool has_top, const char *top,
3138 bool has_backing_file, const char *backing_file,
3139 bool has_speed, int64_t speed,
3140 bool has_filter_node_name, const char *filter_node_name,
3141 Error **errp)
3142 {
3143 BlockDriverState *bs;
3144 BlockDriverState *iter;
3145 BlockDriverState *base_bs, *top_bs;
3146 AioContext *aio_context;
3147 Error *local_err = NULL;
3148 /* This will be part of the QMP command, if/when the
3149 * BlockdevOnError change for blkmirror makes it in
3150 */
3151 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3152
3153 if (!has_speed) {
3154 speed = 0;
3155 }
3156 if (!has_filter_node_name) {
3157 filter_node_name = NULL;
3158 }
3159
3160 /* Important Note:
3161 * libvirt relies on the DeviceNotFound error class in order to probe for
3162 * live commit feature versions; for this to work, we must make sure to
3163 * perform the device lookup before any generic errors that may occur in a
3164 * scenario in which all optional arguments are omitted. */
3165 bs = qmp_get_root_bs(device, &local_err);
3166 if (!bs) {
3167 bs = bdrv_lookup_bs(device, device, NULL);
3168 if (!bs) {
3169 error_free(local_err);
3170 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3171 "Device '%s' not found", device);
3172 } else {
3173 error_propagate(errp, local_err);
3174 }
3175 return;
3176 }
3177
3178 aio_context = bdrv_get_aio_context(bs);
3179 aio_context_acquire(aio_context);
3180
3181 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3182 goto out;
3183 }
3184
3185 /* default top_bs is the active layer */
3186 top_bs = bs;
3187
3188 if (has_top && top) {
3189 if (strcmp(bs->filename, top) != 0) {
3190 top_bs = bdrv_find_backing_image(bs, top);
3191 }
3192 }
3193
3194 if (top_bs == NULL) {
3195 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3196 goto out;
3197 }
3198
3199 assert(bdrv_get_aio_context(top_bs) == aio_context);
3200
3201 if (has_base && base) {
3202 base_bs = bdrv_find_backing_image(top_bs, base);
3203 } else {
3204 base_bs = bdrv_find_base(top_bs);
3205 }
3206
3207 if (base_bs == NULL) {
3208 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3209 goto out;
3210 }
3211
3212 assert(bdrv_get_aio_context(base_bs) == aio_context);
3213
3214 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
3215 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3216 goto out;
3217 }
3218 }
3219
3220 /* Do not allow attempts to commit an image into itself */
3221 if (top_bs == base_bs) {
3222 error_setg(errp, "cannot commit an image into itself");
3223 goto out;
3224 }
3225
3226 if (top_bs == bs) {
3227 if (has_backing_file) {
3228 error_setg(errp, "'backing-file' specified,"
3229 " but 'top' is the active layer");
3230 goto out;
3231 }
3232 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3233 BLOCK_JOB_DEFAULT, speed, on_error,
3234 filter_node_name, NULL, NULL, false, &local_err);
3235 } else {
3236 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
3237 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3238 goto out;
3239 }
3240 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed,
3241 on_error, has_backing_file ? backing_file : NULL,
3242 filter_node_name, &local_err);
3243 }
3244 if (local_err != NULL) {
3245 error_propagate(errp, local_err);
3246 goto out;
3247 }
3248
3249 out:
3250 aio_context_release(aio_context);
3251 }
3252
3253 static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
3254 Error **errp)
3255 {
3256 BlockDriverState *bs;
3257 BlockDriverState *target_bs;
3258 BlockDriverState *source = NULL;
3259 BlockJob *job = NULL;
3260 BdrvDirtyBitmap *bmap = NULL;
3261 AioContext *aio_context;
3262 QDict *options = NULL;
3263 Error *local_err = NULL;
3264 int flags;
3265 int64_t size;
3266 bool set_backing_hd = false;
3267
3268 if (!backup->has_speed) {
3269 backup->speed = 0;
3270 }
3271 if (!backup->has_on_source_error) {
3272 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3273 }
3274 if (!backup->has_on_target_error) {
3275 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3276 }
3277 if (!backup->has_mode) {
3278 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3279 }
3280 if (!backup->has_job_id) {
3281 backup->job_id = NULL;
3282 }
3283 if (!backup->has_compress) {
3284 backup->compress = false;
3285 }
3286
3287 bs = qmp_get_root_bs(backup->device, errp);
3288 if (!bs) {
3289 return NULL;
3290 }
3291
3292 aio_context = bdrv_get_aio_context(bs);
3293 aio_context_acquire(aio_context);
3294
3295 if (!backup->has_format) {
3296 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
3297 NULL : (char*) bs->drv->format_name;
3298 }
3299
3300 /* Early check to avoid creating target */
3301 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3302 goto out;
3303 }
3304
3305 flags = bs->open_flags | BDRV_O_RDWR;
3306
3307 /* See if we have a backing HD we can use to create our new image
3308 * on top of. */
3309 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3310 source = backing_bs(bs);
3311 if (!source) {
3312 backup->sync = MIRROR_SYNC_MODE_FULL;
3313 }
3314 }
3315 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3316 source = bs;
3317 flags |= BDRV_O_NO_BACKING;
3318 set_backing_hd = true;
3319 }
3320
3321 size = bdrv_getlength(bs);
3322 if (size < 0) {
3323 error_setg_errno(errp, -size, "bdrv_getlength failed");
3324 goto out;
3325 }
3326
3327 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
3328 assert(backup->format);
3329 if (source) {
3330 bdrv_img_create(backup->target, backup->format, source->filename,
3331 source->drv->format_name, NULL,
3332 size, flags, false, &local_err);
3333 } else {
3334 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
3335 size, flags, false, &local_err);
3336 }
3337 }
3338
3339 if (local_err) {
3340 error_propagate(errp, local_err);
3341 goto out;
3342 }
3343
3344 if (backup->format) {
3345 if (!options) {
3346 options = qdict_new();
3347 }
3348 qdict_put_str(options, "driver", backup->format);
3349 }
3350
3351 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
3352 if (!target_bs) {
3353 goto out;
3354 }
3355
3356 bdrv_set_aio_context(target_bs, aio_context);
3357
3358 if (set_backing_hd) {
3359 bdrv_set_backing_hd(target_bs, source, &local_err);
3360 if (local_err) {
3361 bdrv_unref(target_bs);
3362 goto out;
3363 }
3364 }
3365
3366 if (backup->has_bitmap) {
3367 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3368 if (!bmap) {
3369 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3370 bdrv_unref(target_bs);
3371 goto out;
3372 }
3373 }
3374
3375 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3376 backup->sync, bmap, backup->compress,
3377 backup->on_source_error, backup->on_target_error,
3378 BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err);
3379 bdrv_unref(target_bs);
3380 if (local_err != NULL) {
3381 error_propagate(errp, local_err);
3382 goto out;
3383 }
3384
3385 out:
3386 aio_context_release(aio_context);
3387 return job;
3388 }
3389
3390 void qmp_drive_backup(DriveBackup *arg, Error **errp)
3391 {
3392
3393 BlockJob *job;
3394 job = do_drive_backup(arg, NULL, errp);
3395 if (job) {
3396 block_job_start(job);
3397 }
3398 }
3399
3400 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3401 {
3402 return bdrv_named_nodes_list(errp);
3403 }
3404
3405 BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn,
3406 Error **errp)
3407 {
3408 BlockDriverState *bs;
3409 BlockDriverState *target_bs;
3410 Error *local_err = NULL;
3411 AioContext *aio_context;
3412 BlockJob *job = NULL;
3413
3414 if (!backup->has_speed) {
3415 backup->speed = 0;
3416 }
3417 if (!backup->has_on_source_error) {
3418 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3419 }
3420 if (!backup->has_on_target_error) {
3421 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3422 }
3423 if (!backup->has_job_id) {
3424 backup->job_id = NULL;
3425 }
3426 if (!backup->has_compress) {
3427 backup->compress = false;
3428 }
3429
3430 bs = qmp_get_root_bs(backup->device, errp);
3431 if (!bs) {
3432 return NULL;
3433 }
3434
3435 aio_context = bdrv_get_aio_context(bs);
3436 aio_context_acquire(aio_context);
3437
3438 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
3439 if (!target_bs) {
3440 goto out;
3441 }
3442
3443 if (bdrv_get_aio_context(target_bs) != aio_context) {
3444 if (!bdrv_has_blk(target_bs)) {
3445 /* The target BDS is not attached, we can safely move it to another
3446 * AioContext. */
3447 bdrv_set_aio_context(target_bs, aio_context);
3448 } else {
3449 error_setg(errp, "Target is attached to a different thread from "
3450 "source.");
3451 goto out;
3452 }
3453 }
3454 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3455 backup->sync, NULL, backup->compress,
3456 backup->on_source_error, backup->on_target_error,
3457 BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err);
3458 if (local_err != NULL) {
3459 error_propagate(errp, local_err);
3460 }
3461 out:
3462 aio_context_release(aio_context);
3463 return job;
3464 }
3465
3466 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
3467 {
3468 BlockJob *job;
3469 job = do_blockdev_backup(arg, NULL, errp);
3470 if (job) {
3471 block_job_start(job);
3472 }
3473 }
3474
3475 /* Parameter check and block job starting for drive mirroring.
3476 * Caller should hold @device and @target's aio context (must be the same).
3477 **/
3478 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3479 BlockDriverState *target,
3480 bool has_replaces, const char *replaces,
3481 enum MirrorSyncMode sync,
3482 BlockMirrorBackingMode backing_mode,
3483 bool has_speed, int64_t speed,
3484 bool has_granularity, uint32_t granularity,
3485 bool has_buf_size, int64_t buf_size,
3486 bool has_on_source_error,
3487 BlockdevOnError on_source_error,
3488 bool has_on_target_error,
3489 BlockdevOnError on_target_error,
3490 bool has_unmap, bool unmap,
3491 bool has_filter_node_name,
3492 const char *filter_node_name,
3493 Error **errp)
3494 {
3495
3496 if (!has_speed) {
3497 speed = 0;
3498 }
3499 if (!has_on_source_error) {
3500 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3501 }
3502 if (!has_on_target_error) {
3503 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3504 }
3505 if (!has_granularity) {
3506 granularity = 0;
3507 }
3508 if (!has_buf_size) {
3509 buf_size = 0;
3510 }
3511 if (!has_unmap) {
3512 unmap = true;
3513 }
3514 if (!has_filter_node_name) {
3515 filter_node_name = NULL;
3516 }
3517
3518 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3519 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3520 "a value in range [512B, 64MB]");
3521 return;
3522 }
3523 if (granularity & (granularity - 1)) {
3524 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3525 "power of 2");
3526 return;
3527 }
3528
3529 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3530 return;
3531 }
3532 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3533 return;
3534 }
3535
3536 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3537 sync = MIRROR_SYNC_MODE_FULL;
3538 }
3539
3540 /* pass the node name to replace to mirror start since it's loose coupling
3541 * and will allow to check whether the node still exist at mirror completion
3542 */
3543 mirror_start(job_id, bs, target,
3544 has_replaces ? replaces : NULL,
3545 speed, granularity, buf_size, sync, backing_mode,
3546 on_source_error, on_target_error, unmap, filter_node_name,
3547 errp);
3548 }
3549
3550 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3551 {
3552 BlockDriverState *bs;
3553 BlockDriverState *source, *target_bs;
3554 AioContext *aio_context;
3555 BlockMirrorBackingMode backing_mode;
3556 Error *local_err = NULL;
3557 QDict *options = NULL;
3558 int flags;
3559 int64_t size;
3560 const char *format = arg->format;
3561
3562 bs = qmp_get_root_bs(arg->device, errp);
3563 if (!bs) {
3564 return;
3565 }
3566
3567 /* Early check to avoid creating target */
3568 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3569 return;
3570 }
3571
3572 aio_context = bdrv_get_aio_context(bs);
3573 aio_context_acquire(aio_context);
3574
3575 if (!arg->has_mode) {
3576 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3577 }
3578
3579 if (!arg->has_format) {
3580 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3581 ? NULL : bs->drv->format_name);
3582 }
3583
3584 flags = bs->open_flags | BDRV_O_RDWR;
3585 source = backing_bs(bs);
3586 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
3587 arg->sync = MIRROR_SYNC_MODE_FULL;
3588 }
3589 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3590 source = bs;
3591 }
3592
3593 size = bdrv_getlength(bs);
3594 if (size < 0) {
3595 error_setg_errno(errp, -size, "bdrv_getlength failed");
3596 goto out;
3597 }
3598
3599 if (arg->has_replaces) {
3600 BlockDriverState *to_replace_bs;
3601 AioContext *replace_aio_context;
3602 int64_t replace_size;
3603
3604 if (!arg->has_node_name) {
3605 error_setg(errp, "a node-name must be provided when replacing a"
3606 " named node of the graph");
3607 goto out;
3608 }
3609
3610 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
3611
3612 if (!to_replace_bs) {
3613 error_propagate(errp, local_err);
3614 goto out;
3615 }
3616
3617 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3618 aio_context_acquire(replace_aio_context);
3619 replace_size = bdrv_getlength(to_replace_bs);
3620 aio_context_release(replace_aio_context);
3621
3622 if (size != replace_size) {
3623 error_setg(errp, "cannot replace image with a mirror image of "
3624 "different size");
3625 goto out;
3626 }
3627 }
3628
3629 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3630 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3631 } else {
3632 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3633 }
3634
3635 /* Don't open backing image in create() */
3636 flags |= BDRV_O_NO_BACKING;
3637
3638 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
3639 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3640 {
3641 /* create new image w/o backing file */
3642 assert(format);
3643 bdrv_img_create(arg->target, format,
3644 NULL, NULL, NULL, size, flags, false, &local_err);
3645 } else {
3646 switch (arg->mode) {
3647 case NEW_IMAGE_MODE_EXISTING:
3648 break;
3649 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3650 /* create new image with backing file */
3651 bdrv_img_create(arg->target, format,
3652 source->filename,
3653 source->drv->format_name,
3654 NULL, size, flags, false, &local_err);
3655 break;
3656 default:
3657 abort();
3658 }
3659 }
3660
3661 if (local_err) {
3662 error_propagate(errp, local_err);
3663 goto out;
3664 }
3665
3666 options = qdict_new();
3667 if (arg->has_node_name) {
3668 qdict_put_str(options, "node-name", arg->node_name);
3669 }
3670 if (format) {
3671 qdict_put_str(options, "driver", format);
3672 }
3673
3674 /* Mirroring takes care of copy-on-write using the source's backing
3675 * file.
3676 */
3677 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3678 if (!target_bs) {
3679 goto out;
3680 }
3681
3682 bdrv_set_aio_context(target_bs, aio_context);
3683
3684 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3685 arg->has_replaces, arg->replaces, arg->sync,
3686 backing_mode, arg->has_speed, arg->speed,
3687 arg->has_granularity, arg->granularity,
3688 arg->has_buf_size, arg->buf_size,
3689 arg->has_on_source_error, arg->on_source_error,
3690 arg->has_on_target_error, arg->on_target_error,
3691 arg->has_unmap, arg->unmap,
3692 false, NULL,
3693 &local_err);
3694 bdrv_unref(target_bs);
3695 error_propagate(errp, local_err);
3696 out:
3697 aio_context_release(aio_context);
3698 }
3699
3700 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3701 const char *device, const char *target,
3702 bool has_replaces, const char *replaces,
3703 MirrorSyncMode sync,
3704 bool has_speed, int64_t speed,
3705 bool has_granularity, uint32_t granularity,
3706 bool has_buf_size, int64_t buf_size,
3707 bool has_on_source_error,
3708 BlockdevOnError on_source_error,
3709 bool has_on_target_error,
3710 BlockdevOnError on_target_error,
3711 bool has_filter_node_name,
3712 const char *filter_node_name,
3713 Error **errp)
3714 {
3715 BlockDriverState *bs;
3716 BlockDriverState *target_bs;
3717 AioContext *aio_context;
3718 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3719 Error *local_err = NULL;
3720
3721 bs = qmp_get_root_bs(device, errp);
3722 if (!bs) {
3723 return;
3724 }
3725
3726 target_bs = bdrv_lookup_bs(target, target, errp);
3727 if (!target_bs) {
3728 return;
3729 }
3730
3731 aio_context = bdrv_get_aio_context(bs);
3732 aio_context_acquire(aio_context);
3733
3734 bdrv_set_aio_context(target_bs, aio_context);
3735
3736 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3737 has_replaces, replaces, sync, backing_mode,
3738 has_speed, speed,
3739 has_granularity, granularity,
3740 has_buf_size, buf_size,
3741 has_on_source_error, on_source_error,
3742 has_on_target_error, on_target_error,
3743 true, true,
3744 has_filter_node_name, filter_node_name,
3745 &local_err);
3746 error_propagate(errp, local_err);
3747
3748 aio_context_release(aio_context);
3749 }
3750
3751 /* Get a block job using its ID and acquire its AioContext */
3752 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3753 Error **errp)
3754 {
3755 BlockJob *job;
3756
3757 assert(id != NULL);
3758
3759 *aio_context = NULL;
3760
3761 job = block_job_get(id);
3762
3763 if (!job) {
3764 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3765 "Block job '%s' not found", id);
3766 return NULL;
3767 }
3768
3769 *aio_context = blk_get_aio_context(job->blk);
3770 aio_context_acquire(*aio_context);
3771
3772 return job;
3773 }
3774
3775 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3776 {
3777 AioContext *aio_context;
3778 BlockJob *job = find_block_job(device, &aio_context, errp);
3779
3780 if (!job) {
3781 return;
3782 }
3783
3784 block_job_set_speed(job, speed, errp);
3785 aio_context_release(aio_context);
3786 }
3787
3788 void qmp_block_job_cancel(const char *device,
3789 bool has_force, bool force, Error **errp)
3790 {
3791 AioContext *aio_context;
3792 BlockJob *job = find_block_job(device, &aio_context, errp);
3793
3794 if (!job) {
3795 return;
3796 }
3797
3798 if (!has_force) {
3799 force = false;
3800 }
3801
3802 if (block_job_user_paused(job) && !force) {
3803 error_setg(errp, "The block job for device '%s' is currently paused",
3804 device);
3805 goto out;
3806 }
3807
3808 trace_qmp_block_job_cancel(job);
3809 block_job_cancel(job);
3810 out:
3811 aio_context_release(aio_context);
3812 }
3813
3814 void qmp_block_job_pause(const char *device, Error **errp)
3815 {
3816 AioContext *aio_context;
3817 BlockJob *job = find_block_job(device, &aio_context, errp);
3818
3819 if (!job || block_job_user_paused(job)) {
3820 return;
3821 }
3822
3823 trace_qmp_block_job_pause(job);
3824 block_job_user_pause(job);
3825 aio_context_release(aio_context);
3826 }
3827
3828 void qmp_block_job_resume(const char *device, Error **errp)
3829 {
3830 AioContext *aio_context;
3831 BlockJob *job = find_block_job(device, &aio_context, errp);
3832
3833 if (!job || !block_job_user_paused(job)) {
3834 return;
3835 }
3836
3837 trace_qmp_block_job_resume(job);
3838 block_job_user_resume(job);
3839 aio_context_release(aio_context);
3840 }
3841
3842 void qmp_block_job_complete(const char *device, Error **errp)
3843 {
3844 AioContext *aio_context;
3845 BlockJob *job = find_block_job(device, &aio_context, errp);
3846
3847 if (!job) {
3848 return;
3849 }
3850
3851 trace_qmp_block_job_complete(job);
3852 block_job_complete(job, errp);
3853 aio_context_release(aio_context);
3854 }
3855
3856 void qmp_change_backing_file(const char *device,
3857 const char *image_node_name,
3858 const char *backing_file,
3859 Error **errp)
3860 {
3861 BlockDriverState *bs = NULL;
3862 AioContext *aio_context;
3863 BlockDriverState *image_bs = NULL;
3864 Error *local_err = NULL;
3865 bool ro;
3866 int open_flags;
3867 int ret;
3868
3869 bs = qmp_get_root_bs(device, errp);
3870 if (!bs) {
3871 return;
3872 }
3873
3874 aio_context = bdrv_get_aio_context(bs);
3875 aio_context_acquire(aio_context);
3876
3877 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3878 if (local_err) {
3879 error_propagate(errp, local_err);
3880 goto out;
3881 }
3882
3883 if (!image_bs) {
3884 error_setg(errp, "image file not found");
3885 goto out;
3886 }
3887
3888 if (bdrv_find_base(image_bs) == image_bs) {
3889 error_setg(errp, "not allowing backing file change on an image "
3890 "without a backing file");
3891 goto out;
3892 }
3893
3894 /* even though we are not necessarily operating on bs, we need it to
3895 * determine if block ops are currently prohibited on the chain */
3896 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3897 goto out;
3898 }
3899
3900 /* final sanity check */
3901 if (!bdrv_chain_contains(bs, image_bs)) {
3902 error_setg(errp, "'%s' and image file are not in the same chain",
3903 device);
3904 goto out;
3905 }
3906
3907 /* if not r/w, reopen to make r/w */
3908 open_flags = image_bs->open_flags;
3909 ro = bdrv_is_read_only(image_bs);
3910
3911 if (ro) {
3912 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3913 if (local_err) {
3914 error_propagate(errp, local_err);
3915 goto out;
3916 }
3917 }
3918
3919 ret = bdrv_change_backing_file(image_bs, backing_file,
3920 image_bs->drv ? image_bs->drv->format_name : "");
3921
3922 if (ret < 0) {
3923 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3924 backing_file);
3925 /* don't exit here, so we can try to restore open flags if
3926 * appropriate */
3927 }
3928
3929 if (ro) {
3930 bdrv_reopen(image_bs, open_flags, &local_err);
3931 error_propagate(errp, local_err);
3932 }
3933
3934 out:
3935 aio_context_release(aio_context);
3936 }
3937
3938 void hmp_drive_add_node(Monitor *mon, const char *optstr)
3939 {
3940 QemuOpts *opts;
3941 QDict *qdict;
3942 Error *local_err = NULL;
3943
3944 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
3945 if (!opts) {
3946 return;
3947 }
3948
3949 qdict = qemu_opts_to_qdict(opts, NULL);
3950
3951 if (!qdict_get_try_str(qdict, "node-name")) {
3952 QDECREF(qdict);
3953 error_report("'node-name' needs to be specified");
3954 goto out;
3955 }
3956
3957 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
3958 if (!bs) {
3959 error_report_err(local_err);
3960 goto out;
3961 }
3962
3963 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3964
3965 out:
3966 qemu_opts_del(opts);
3967 }
3968
3969 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3970 {
3971 BlockDriverState *bs;
3972 QObject *obj;
3973 Visitor *v = qobject_output_visitor_new(&obj);
3974 QDict *qdict;
3975 const QDictEntry *ent;
3976 Error *local_err = NULL;
3977
3978 visit_type_BlockdevOptions(v, NULL, &options, &local_err);
3979 if (local_err) {
3980 error_propagate(errp, local_err);
3981 goto fail;
3982 }
3983
3984 visit_complete(v, &obj);
3985 qdict = qobject_to_qdict(obj);
3986
3987 qdict_flatten(qdict);
3988
3989 /*
3990 * Rewrite "backing": null to "backing": ""
3991 * TODO Rewrite "" to null instead, and perhaps not even here
3992 */
3993 for (ent = qdict_first(qdict); ent; ent = qdict_next(qdict, ent)) {
3994 char *dot = strrchr(ent->key, '.');
3995
3996 if (!strcmp(dot ? dot + 1 : ent->key, "backing")
3997 && qobject_type(ent->value) == QTYPE_QNULL) {
3998 qdict_put(qdict, ent->key, qstring_new());
3999 }
4000 }
4001
4002 if (!qdict_get_try_str(qdict, "node-name")) {
4003 error_setg(errp, "'node-name' must be specified for the root node");
4004 goto fail;
4005 }
4006
4007 bs = bds_tree_init(qdict, errp);
4008 if (!bs) {
4009 goto fail;
4010 }
4011
4012 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4013
4014 fail:
4015 visit_free(v);
4016 }
4017
4018 void qmp_blockdev_del(const char *node_name, Error **errp)
4019 {
4020 AioContext *aio_context;
4021 BlockDriverState *bs;
4022
4023 bs = bdrv_find_node(node_name);
4024 if (!bs) {
4025 error_setg(errp, "Cannot find node %s", node_name);
4026 return;
4027 }
4028 if (bdrv_has_blk(bs)) {
4029 error_setg(errp, "Node %s is in use", node_name);
4030 return;
4031 }
4032 aio_context = bdrv_get_aio_context(bs);
4033 aio_context_acquire(aio_context);
4034
4035 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4036 goto out;
4037 }
4038
4039 if (!bs->monitor_list.tqe_prev) {
4040 error_setg(errp, "Node %s is not owned by the monitor",
4041 bs->node_name);
4042 goto out;
4043 }
4044
4045 if (bs->refcnt > 1) {
4046 error_setg(errp, "Block device %s is in use",
4047 bdrv_get_device_or_node_name(bs));
4048 goto out;
4049 }
4050
4051 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4052 bdrv_unref(bs);
4053
4054 out:
4055 aio_context_release(aio_context);
4056 }
4057
4058 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
4059 const char *child_name)
4060 {
4061 BdrvChild *child;
4062
4063 QLIST_FOREACH(child, &parent_bs->children, next) {
4064 if (strcmp(child->name, child_name) == 0) {
4065 return child;
4066 }
4067 }
4068
4069 return NULL;
4070 }
4071
4072 void qmp_x_blockdev_change(const char *parent, bool has_child,
4073 const char *child, bool has_node,
4074 const char *node, Error **errp)
4075 {
4076 BlockDriverState *parent_bs, *new_bs = NULL;
4077 BdrvChild *p_child;
4078
4079 parent_bs = bdrv_lookup_bs(parent, parent, errp);
4080 if (!parent_bs) {
4081 return;
4082 }
4083
4084 if (has_child == has_node) {
4085 if (has_child) {
4086 error_setg(errp, "The parameters child and node are in conflict");
4087 } else {
4088 error_setg(errp, "Either child or node must be specified");
4089 }
4090 return;
4091 }
4092
4093 if (has_child) {
4094 p_child = bdrv_find_child(parent_bs, child);
4095 if (!p_child) {
4096 error_setg(errp, "Node '%s' does not have child '%s'",
4097 parent, child);
4098 return;
4099 }
4100 bdrv_del_child(parent_bs, p_child, errp);
4101 }
4102
4103 if (has_node) {
4104 new_bs = bdrv_find_node(node);
4105 if (!new_bs) {
4106 error_setg(errp, "Node '%s' not found", node);
4107 return;
4108 }
4109 bdrv_add_child(parent_bs, new_bs, errp);
4110 }
4111 }
4112
4113 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4114 {
4115 BlockJobInfoList *head = NULL, **p_next = &head;
4116 BlockJob *job;
4117
4118 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
4119 BlockJobInfoList *elem;
4120 AioContext *aio_context;
4121
4122 if (block_job_is_internal(job)) {
4123 continue;
4124 }
4125 elem = g_new0(BlockJobInfoList, 1);
4126 aio_context = blk_get_aio_context(job->blk);
4127 aio_context_acquire(aio_context);
4128 elem->value = block_job_query(job, errp);
4129 aio_context_release(aio_context);
4130 if (!elem->value) {
4131 g_free(elem);
4132 qapi_free_BlockJobInfoList(head);
4133 return NULL;
4134 }
4135 *p_next = elem;
4136 p_next = &elem->next;
4137 }
4138
4139 return head;
4140 }
4141
4142 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
4143 bool has_force, bool force, Error **errp)
4144 {
4145 AioContext *old_context;
4146 AioContext *new_context;
4147 BlockDriverState *bs;
4148
4149 bs = bdrv_find_node(node_name);
4150 if (!bs) {
4151 error_setg(errp, "Cannot find node %s", node_name);
4152 return;
4153 }
4154
4155 /* Protects against accidents. */
4156 if (!(has_force && force) && bdrv_has_blk(bs)) {
4157 error_setg(errp, "Node %s is associated with a BlockBackend and could "
4158 "be in use (use force=true to override this check)",
4159 node_name);
4160 return;
4161 }
4162
4163 if (iothread->type == QTYPE_QSTRING) {
4164 IOThread *obj = iothread_by_id(iothread->u.s);
4165 if (!obj) {
4166 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
4167 return;
4168 }
4169
4170 new_context = iothread_get_aio_context(obj);
4171 } else {
4172 new_context = qemu_get_aio_context();
4173 }
4174
4175 old_context = bdrv_get_aio_context(bs);
4176 aio_context_acquire(old_context);
4177
4178 bdrv_set_aio_context(bs, new_context);
4179
4180 aio_context_release(old_context);
4181 }
4182
4183 QemuOptsList qemu_common_drive_opts = {
4184 .name = "drive",
4185 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4186 .desc = {
4187 {
4188 .name = "snapshot",
4189 .type = QEMU_OPT_BOOL,
4190 .help = "enable/disable snapshot mode",
4191 },{
4192 .name = "aio",
4193 .type = QEMU_OPT_STRING,
4194 .help = "host AIO implementation (threads, native)",
4195 },{
4196 .name = BDRV_OPT_CACHE_WB,
4197 .type = QEMU_OPT_BOOL,
4198 .help = "Enable writeback mode",
4199 },{
4200 .name = "format",
4201 .type = QEMU_OPT_STRING,
4202 .help = "disk format (raw, qcow2, ...)",
4203 },{
4204 .name = "rerror",
4205 .type = QEMU_OPT_STRING,
4206 .help = "read error action",
4207 },{
4208 .name = "werror",
4209 .type = QEMU_OPT_STRING,
4210 .help = "write error action",
4211 },{
4212 .name = BDRV_OPT_READ_ONLY,
4213 .type = QEMU_OPT_BOOL,
4214 .help = "open drive file as read-only",
4215 },
4216
4217 THROTTLE_OPTS,
4218
4219 {
4220 .name = "throttling.group",
4221 .type = QEMU_OPT_STRING,
4222 .help = "name of the block throttling group",
4223 },{
4224 .name = "copy-on-read",
4225 .type = QEMU_OPT_BOOL,
4226 .help = "copy read data from backing file into image file",
4227 },{
4228 .name = "detect-zeroes",
4229 .type = QEMU_OPT_STRING,
4230 .help = "try to optimize zero writes (off, on, unmap)",
4231 },{
4232 .name = "stats-account-invalid",
4233 .type = QEMU_OPT_BOOL,
4234 .help = "whether to account for invalid I/O operations "
4235 "in the statistics",
4236 },{
4237 .name = "stats-account-failed",
4238 .type = QEMU_OPT_BOOL,
4239 .help = "whether to account for failed I/O operations "
4240 "in the statistics",
4241 },
4242 { /* end of list */ }
4243 },
4244 };
4245
4246 QemuOptsList qemu_drive_opts = {
4247 .name = "drive",
4248 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4249 .desc = {
4250 /*
4251 * no elements => accept any params
4252 * validation will happen later
4253 */
4254 { /* end of list */ }
4255 },
4256 };
AR7 emulation for QEMU