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Merge remote-tracking branch 'remotes/kraxel/tags/seabios-1.11.1-20180319-pull-reques...
[qemu/kevin.git] / blockdev.c
blobb9de18f3b2040e99b1289b76bd6148fbf6971d64
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_qmp_locked(state->bitmap)) {
2122 error_setg(errp, "Cannot modify a locked bitmap");
2123 return;
2124 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2125 error_setg(errp, "Cannot clear a disabled bitmap");
2126 return;
2127 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
2128 error_setg(errp, "Cannot clear a readonly bitmap");
2129 return;
2130 }
2131
2132 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2133 }
2134
2135 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2136 {
2137 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2138 common, common);
2139
2140 if (state->backup) {
2141 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2142 }
2143 }
2144
2145 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2146 {
2147 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2148 common, common);
2149
2150 hbitmap_free(state->backup);
2151 }
2152
2153 static void abort_prepare(BlkActionState *common, Error **errp)
2154 {
2155 error_setg(errp, "Transaction aborted using Abort action");
2156 }
2157
2158 static void abort_commit(BlkActionState *common)
2159 {
2160 g_assert_not_reached(); /* this action never succeeds */
2161 }
2162
2163 static const BlkActionOps actions[] = {
2164 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2165 .instance_size = sizeof(ExternalSnapshotState),
2166 .prepare = external_snapshot_prepare,
2167 .commit = external_snapshot_commit,
2168 .abort = external_snapshot_abort,
2169 .clean = external_snapshot_clean,
2170 },
2171 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2172 .instance_size = sizeof(ExternalSnapshotState),
2173 .prepare = external_snapshot_prepare,
2174 .commit = external_snapshot_commit,
2175 .abort = external_snapshot_abort,
2176 .clean = external_snapshot_clean,
2177 },
2178 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2179 .instance_size = sizeof(DriveBackupState),
2180 .prepare = drive_backup_prepare,
2181 .commit = drive_backup_commit,
2182 .abort = drive_backup_abort,
2183 .clean = drive_backup_clean,
2184 },
2185 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2186 .instance_size = sizeof(BlockdevBackupState),
2187 .prepare = blockdev_backup_prepare,
2188 .commit = blockdev_backup_commit,
2189 .abort = blockdev_backup_abort,
2190 .clean = blockdev_backup_clean,
2191 },
2192 [TRANSACTION_ACTION_KIND_ABORT] = {
2193 .instance_size = sizeof(BlkActionState),
2194 .prepare = abort_prepare,
2195 .commit = abort_commit,
2196 },
2197 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2198 .instance_size = sizeof(InternalSnapshotState),
2199 .prepare = internal_snapshot_prepare,
2200 .abort = internal_snapshot_abort,
2201 .clean = internal_snapshot_clean,
2202 },
2203 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2204 .instance_size = sizeof(BlockDirtyBitmapState),
2205 .prepare = block_dirty_bitmap_add_prepare,
2206 .abort = block_dirty_bitmap_add_abort,
2207 },
2208 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2209 .instance_size = sizeof(BlockDirtyBitmapState),
2210 .prepare = block_dirty_bitmap_clear_prepare,
2211 .commit = block_dirty_bitmap_clear_commit,
2212 .abort = block_dirty_bitmap_clear_abort,
2213 }
2214 };
2215
2216 /**
2217 * Allocate a TransactionProperties structure if necessary, and fill
2218 * that structure with desired defaults if they are unset.
2219 */
2220 static TransactionProperties *get_transaction_properties(
2221 TransactionProperties *props)
2222 {
2223 if (!props) {
2224 props = g_new0(TransactionProperties, 1);
2225 }
2226
2227 if (!props->has_completion_mode) {
2228 props->has_completion_mode = true;
2229 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2230 }
2231
2232 return props;
2233 }
2234
2235 /*
2236 * 'Atomic' group operations. The operations are performed as a set, and if
2237 * any fail then we roll back all operations in the group.
2238 */
2239 void qmp_transaction(TransactionActionList *dev_list,
2240 bool has_props,
2241 struct TransactionProperties *props,
2242 Error **errp)
2243 {
2244 TransactionActionList *dev_entry = dev_list;
2245 BlockJobTxn *block_job_txn = NULL;
2246 BlkActionState *state, *next;
2247 Error *local_err = NULL;
2248
2249 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2250 QSIMPLEQ_INIT(&snap_bdrv_states);
2251
2252 /* Does this transaction get canceled as a group on failure?
2253 * If not, we don't really need to make a BlockJobTxn.
2254 */
2255 props = get_transaction_properties(props);
2256 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2257 block_job_txn = block_job_txn_new();
2258 }
2259
2260 /* drain all i/o before any operations */
2261 bdrv_drain_all();
2262
2263 /* We don't do anything in this loop that commits us to the operations */
2264 while (NULL != dev_entry) {
2265 TransactionAction *dev_info = NULL;
2266 const BlkActionOps *ops;
2267
2268 dev_info = dev_entry->value;
2269 dev_entry = dev_entry->next;
2270
2271 assert(dev_info->type < ARRAY_SIZE(actions));
2272
2273 ops = &actions[dev_info->type];
2274 assert(ops->instance_size > 0);
2275
2276 state = g_malloc0(ops->instance_size);
2277 state->ops = ops;
2278 state->action = dev_info;
2279 state->block_job_txn = block_job_txn;
2280 state->txn_props = props;
2281 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2282
2283 state->ops->prepare(state, &local_err);
2284 if (local_err) {
2285 error_propagate(errp, local_err);
2286 goto delete_and_fail;
2287 }
2288 }
2289
2290 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2291 if (state->ops->commit) {
2292 state->ops->commit(state);
2293 }
2294 }
2295
2296 /* success */
2297 goto exit;
2298
2299 delete_and_fail:
2300 /* failure, and it is all-or-none; roll back all operations */
2301 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2302 if (state->ops->abort) {
2303 state->ops->abort(state);
2304 }
2305 }
2306 exit:
2307 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2308 if (state->ops->clean) {
2309 state->ops->clean(state);
2310 }
2311 g_free(state);
2312 }
2313 if (!has_props) {
2314 qapi_free_TransactionProperties(props);
2315 }
2316 block_job_txn_unref(block_job_txn);
2317 }
2318
2319 void qmp_eject(bool has_device, const char *device,
2320 bool has_id, const char *id,
2321 bool has_force, bool force, Error **errp)
2322 {
2323 Error *local_err = NULL;
2324 int rc;
2325
2326 if (!has_force) {
2327 force = false;
2328 }
2329
2330 rc = do_open_tray(has_device ? device : NULL,
2331 has_id ? id : NULL,
2332 force, &local_err);
2333 if (rc && rc != -ENOSYS) {
2334 error_propagate(errp, local_err);
2335 return;
2336 }
2337 error_free(local_err);
2338
2339 blockdev_remove_medium(has_device, device, has_id, id, errp);
2340 }
2341
2342 void qmp_block_passwd(bool has_device, const char *device,
2343 bool has_node_name, const char *node_name,
2344 const char *password, Error **errp)
2345 {
2346 error_setg(errp,
2347 "Setting block passwords directly is no longer supported");
2348 }
2349
2350 /*
2351 * Attempt to open the tray of @device.
2352 * If @force, ignore its tray lock.
2353 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2354 * On error, store an error through @errp and return -errno.
2355 * If @device does not exist, return -ENODEV.
2356 * If it has no removable media, return -ENOTSUP.
2357 * If it has no tray, return -ENOSYS.
2358 * If the guest was asked to open the tray, return -EINPROGRESS.
2359 * Else, return 0.
2360 */
2361 static int do_open_tray(const char *blk_name, const char *qdev_id,
2362 bool force, Error **errp)
2363 {
2364 BlockBackend *blk;
2365 const char *device = qdev_id ?: blk_name;
2366 bool locked;
2367
2368 blk = qmp_get_blk(blk_name, qdev_id, errp);
2369 if (!blk) {
2370 return -ENODEV;
2371 }
2372
2373 if (!blk_dev_has_removable_media(blk)) {
2374 error_setg(errp, "Device '%s' is not removable", device);
2375 return -ENOTSUP;
2376 }
2377
2378 if (!blk_dev_has_tray(blk)) {
2379 error_setg(errp, "Device '%s' does not have a tray", device);
2380 return -ENOSYS;
2381 }
2382
2383 if (blk_dev_is_tray_open(blk)) {
2384 return 0;
2385 }
2386
2387 locked = blk_dev_is_medium_locked(blk);
2388 if (locked) {
2389 blk_dev_eject_request(blk, force);
2390 }
2391
2392 if (!locked || force) {
2393 blk_dev_change_media_cb(blk, false, &error_abort);
2394 }
2395
2396 if (locked && !force) {
2397 error_setg(errp, "Device '%s' is locked and force was not specified, "
2398 "wait for tray to open and try again", device);
2399 return -EINPROGRESS;
2400 }
2401
2402 return 0;
2403 }
2404
2405 void qmp_blockdev_open_tray(bool has_device, const char *device,
2406 bool has_id, const char *id,
2407 bool has_force, bool force,
2408 Error **errp)
2409 {
2410 Error *local_err = NULL;
2411 int rc;
2412
2413 if (!has_force) {
2414 force = false;
2415 }
2416 rc = do_open_tray(has_device ? device : NULL,
2417 has_id ? id : NULL,
2418 force, &local_err);
2419 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
2420 error_propagate(errp, local_err);
2421 return;
2422 }
2423 error_free(local_err);
2424 }
2425
2426 void qmp_blockdev_close_tray(bool has_device, const char *device,
2427 bool has_id, const char *id,
2428 Error **errp)
2429 {
2430 BlockBackend *blk;
2431 Error *local_err = NULL;
2432
2433 device = has_device ? device : NULL;
2434 id = has_id ? id : NULL;
2435
2436 blk = qmp_get_blk(device, id, errp);
2437 if (!blk) {
2438 return;
2439 }
2440
2441 if (!blk_dev_has_removable_media(blk)) {
2442 error_setg(errp, "Device '%s' is not removable", device ?: id);
2443 return;
2444 }
2445
2446 if (!blk_dev_has_tray(blk)) {
2447 /* Ignore this command on tray-less devices */
2448 return;
2449 }
2450
2451 if (!blk_dev_is_tray_open(blk)) {
2452 return;
2453 }
2454
2455 blk_dev_change_media_cb(blk, true, &local_err);
2456 if (local_err) {
2457 error_propagate(errp, local_err);
2458 return;
2459 }
2460 }
2461
2462 static void blockdev_remove_medium(bool has_device, const char *device,
2463 bool has_id, const char *id, Error **errp)
2464 {
2465 BlockBackend *blk;
2466 BlockDriverState *bs;
2467 AioContext *aio_context;
2468 bool has_attached_device;
2469
2470 device = has_device ? device : NULL;
2471 id = has_id ? id : NULL;
2472
2473 blk = qmp_get_blk(device, id, errp);
2474 if (!blk) {
2475 return;
2476 }
2477
2478 /* For BBs without a device, we can exchange the BDS tree at will */
2479 has_attached_device = blk_get_attached_dev(blk);
2480
2481 if (has_attached_device && !blk_dev_has_removable_media(blk)) {
2482 error_setg(errp, "Device '%s' is not removable", device ?: id);
2483 return;
2484 }
2485
2486 if (has_attached_device && blk_dev_has_tray(blk) &&
2487 !blk_dev_is_tray_open(blk))
2488 {
2489 error_setg(errp, "Tray of device '%s' is not open", device ?: id);
2490 return;
2491 }
2492
2493 bs = blk_bs(blk);
2494 if (!bs) {
2495 return;
2496 }
2497
2498 aio_context = bdrv_get_aio_context(bs);
2499 aio_context_acquire(aio_context);
2500
2501 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2502 goto out;
2503 }
2504
2505 blk_remove_bs(blk);
2506
2507 if (!blk_dev_has_tray(blk)) {
2508 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2509 * called at all); therefore, the medium needs to be ejected here.
2510 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2511 * value passed here (i.e. false). */
2512 blk_dev_change_media_cb(blk, false, &error_abort);
2513 }
2514
2515 out:
2516 aio_context_release(aio_context);
2517 }
2518
2519 void qmp_blockdev_remove_medium(const char *id, Error **errp)
2520 {
2521 blockdev_remove_medium(false, NULL, true, id, errp);
2522 }
2523
2524 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2525 BlockDriverState *bs, Error **errp)
2526 {
2527 Error *local_err = NULL;
2528 bool has_device;
2529 int ret;
2530
2531 /* For BBs without a device, we can exchange the BDS tree at will */
2532 has_device = blk_get_attached_dev(blk);
2533
2534 if (has_device && !blk_dev_has_removable_media(blk)) {
2535 error_setg(errp, "Device is not removable");
2536 return;
2537 }
2538
2539 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2540 error_setg(errp, "Tray of the device is not open");
2541 return;
2542 }
2543
2544 if (blk_bs(blk)) {
2545 error_setg(errp, "There already is a medium in the device");
2546 return;
2547 }
2548
2549 ret = blk_insert_bs(blk, bs, errp);
2550 if (ret < 0) {
2551 return;
2552 }
2553
2554 if (!blk_dev_has_tray(blk)) {
2555 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2556 * called at all); therefore, the medium needs to be pushed into the
2557 * slot here.
2558 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2559 * value passed here (i.e. true). */
2560 blk_dev_change_media_cb(blk, true, &local_err);
2561 if (local_err) {
2562 error_propagate(errp, local_err);
2563 blk_remove_bs(blk);
2564 return;
2565 }
2566 }
2567 }
2568
2569 static void blockdev_insert_medium(bool has_device, const char *device,
2570 bool has_id, const char *id,
2571 const char *node_name, Error **errp)
2572 {
2573 BlockBackend *blk;
2574 BlockDriverState *bs;
2575
2576 blk = qmp_get_blk(has_device ? device : NULL,
2577 has_id ? id : NULL,
2578 errp);
2579 if (!blk) {
2580 return;
2581 }
2582
2583 bs = bdrv_find_node(node_name);
2584 if (!bs) {
2585 error_setg(errp, "Node '%s' not found", node_name);
2586 return;
2587 }
2588
2589 if (bdrv_has_blk(bs)) {
2590 error_setg(errp, "Node '%s' is already in use", node_name);
2591 return;
2592 }
2593
2594 qmp_blockdev_insert_anon_medium(blk, bs, errp);
2595 }
2596
2597 void qmp_blockdev_insert_medium(const char *id, const char *node_name,
2598 Error **errp)
2599 {
2600 blockdev_insert_medium(false, NULL, true, id, node_name, errp);
2601 }
2602
2603 void qmp_blockdev_change_medium(bool has_device, const char *device,
2604 bool has_id, const char *id,
2605 const char *filename,
2606 bool has_format, const char *format,
2607 bool has_read_only,
2608 BlockdevChangeReadOnlyMode read_only,
2609 Error **errp)
2610 {
2611 BlockBackend *blk;
2612 BlockDriverState *medium_bs = NULL;
2613 int bdrv_flags;
2614 bool detect_zeroes;
2615 int rc;
2616 QDict *options = NULL;
2617 Error *err = NULL;
2618
2619 blk = qmp_get_blk(has_device ? device : NULL,
2620 has_id ? id : NULL,
2621 errp);
2622 if (!blk) {
2623 goto fail;
2624 }
2625
2626 if (blk_bs(blk)) {
2627 blk_update_root_state(blk);
2628 }
2629
2630 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2631 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2632 BDRV_O_PROTOCOL);
2633
2634 if (!has_read_only) {
2635 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2636 }
2637
2638 switch (read_only) {
2639 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2640 break;
2641
2642 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2643 bdrv_flags &= ~BDRV_O_RDWR;
2644 break;
2645
2646 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2647 bdrv_flags |= BDRV_O_RDWR;
2648 break;
2649
2650 default:
2651 abort();
2652 }
2653
2654 options = qdict_new();
2655 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2656 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
2657
2658 if (has_format) {
2659 qdict_put_str(options, "driver", format);
2660 }
2661
2662 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
2663 if (!medium_bs) {
2664 goto fail;
2665 }
2666
2667 rc = do_open_tray(has_device ? device : NULL,
2668 has_id ? id : NULL,
2669 false, &err);
2670 if (rc && rc != -ENOSYS) {
2671 error_propagate(errp, err);
2672 goto fail;
2673 }
2674 error_free(err);
2675 err = NULL;
2676
2677 blockdev_remove_medium(has_device, device, has_id, id, &err);
2678 if (err) {
2679 error_propagate(errp, err);
2680 goto fail;
2681 }
2682
2683 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2684 if (err) {
2685 error_propagate(errp, err);
2686 goto fail;
2687 }
2688
2689 qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2690
2691 fail:
2692 /* If the medium has been inserted, the device has its own reference, so
2693 * ours must be relinquished; and if it has not been inserted successfully,
2694 * the reference must be relinquished anyway */
2695 bdrv_unref(medium_bs);
2696 }
2697
2698 /* throttling disk I/O limits */
2699 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2700 {
2701 ThrottleConfig cfg;
2702 BlockDriverState *bs;
2703 BlockBackend *blk;
2704 AioContext *aio_context;
2705
2706 blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
2707 arg->has_id ? arg->id : NULL,
2708 errp);
2709 if (!blk) {
2710 return;
2711 }
2712
2713 aio_context = blk_get_aio_context(blk);
2714 aio_context_acquire(aio_context);
2715
2716 bs = blk_bs(blk);
2717 if (!bs) {
2718 error_setg(errp, "Device has no medium");
2719 goto out;
2720 }
2721
2722 throttle_config_init(&cfg);
2723 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
2724 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd;
2725 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
2726
2727 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
2728 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd;
2729 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
2730
2731 if (arg->has_bps_max) {
2732 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2733 }
2734 if (arg->has_bps_rd_max) {
2735 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2736 }
2737 if (arg->has_bps_wr_max) {
2738 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2739 }
2740 if (arg->has_iops_max) {
2741 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2742 }
2743 if (arg->has_iops_rd_max) {
2744 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2745 }
2746 if (arg->has_iops_wr_max) {
2747 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2748 }
2749
2750 if (arg->has_bps_max_length) {
2751 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2752 }
2753 if (arg->has_bps_rd_max_length) {
2754 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2755 }
2756 if (arg->has_bps_wr_max_length) {
2757 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2758 }
2759 if (arg->has_iops_max_length) {
2760 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2761 }
2762 if (arg->has_iops_rd_max_length) {
2763 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2764 }
2765 if (arg->has_iops_wr_max_length) {
2766 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2767 }
2768
2769 if (arg->has_iops_size) {
2770 cfg.op_size = arg->iops_size;
2771 }
2772
2773 if (!throttle_is_valid(&cfg, errp)) {
2774 goto out;
2775 }
2776
2777 if (throttle_enabled(&cfg)) {
2778 /* Enable I/O limits if they're not enabled yet, otherwise
2779 * just update the throttling group. */
2780 if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
2781 blk_io_limits_enable(blk,
2782 arg->has_group ? arg->group :
2783 arg->has_device ? arg->device :
2784 arg->id);
2785 } else if (arg->has_group) {
2786 blk_io_limits_update_group(blk, arg->group);
2787 }
2788 /* Set the new throttling configuration */
2789 blk_set_io_limits(blk, &cfg);
2790 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
2791 /* If all throttling settings are set to 0, disable I/O limits */
2792 blk_io_limits_disable(blk);
2793 }
2794
2795 out:
2796 aio_context_release(aio_context);
2797 }
2798
2799 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2800 bool has_granularity, uint32_t granularity,
2801 bool has_persistent, bool persistent,
2802 bool has_autoload, bool autoload,
2803 Error **errp)
2804 {
2805 BlockDriverState *bs;
2806 BdrvDirtyBitmap *bitmap;
2807
2808 if (!name || name[0] == '\0') {
2809 error_setg(errp, "Bitmap name cannot be empty");
2810 return;
2811 }
2812
2813 bs = bdrv_lookup_bs(node, node, errp);
2814 if (!bs) {
2815 return;
2816 }
2817
2818 if (has_granularity) {
2819 if (granularity < 512 || !is_power_of_2(granularity)) {
2820 error_setg(errp, "Granularity must be power of 2 "
2821 "and at least 512");
2822 return;
2823 }
2824 } else {
2825 /* Default to cluster size, if available: */
2826 granularity = bdrv_get_default_bitmap_granularity(bs);
2827 }
2828
2829 if (!has_persistent) {
2830 persistent = false;
2831 }
2832
2833 if (has_autoload) {
2834 warn_report("Autoload option is deprecated and its value is ignored");
2835 }
2836
2837 if (persistent &&
2838 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
2839 {
2840 return;
2841 }
2842
2843 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2844 if (bitmap == NULL) {
2845 return;
2846 }
2847
2848 bdrv_dirty_bitmap_set_persistance(bitmap, persistent);
2849 }
2850
2851 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2852 Error **errp)
2853 {
2854 BlockDriverState *bs;
2855 BdrvDirtyBitmap *bitmap;
2856 Error *local_err = NULL;
2857
2858 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2859 if (!bitmap || !bs) {
2860 return;
2861 }
2862
2863 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2864 error_setg(errp,
2865 "Bitmap '%s' is currently frozen and cannot be removed",
2866 name);
2867 return;
2868 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
2869 error_setg(errp,
2870 "Bitmap '%s' is currently locked and cannot be removed",
2871 name);
2872 return;
2873 }
2874
2875 if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
2876 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
2877 if (local_err != NULL) {
2878 error_propagate(errp, local_err);
2879 return;
2880 }
2881 }
2882
2883 bdrv_dirty_bitmap_make_anon(bitmap);
2884 bdrv_release_dirty_bitmap(bs, bitmap);
2885 }
2886
2887 /**
2888 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2889 * immediately after a full backup operation.
2890 */
2891 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2892 Error **errp)
2893 {
2894 BdrvDirtyBitmap *bitmap;
2895 BlockDriverState *bs;
2896
2897 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2898 if (!bitmap || !bs) {
2899 return;
2900 }
2901
2902 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2903 error_setg(errp,
2904 "Bitmap '%s' is currently frozen and cannot be modified",
2905 name);
2906 return;
2907 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
2908 error_setg(errp,
2909 "Bitmap '%s' is currently locked and cannot be modified",
2910 name);
2911 return;
2912 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2913 error_setg(errp,
2914 "Bitmap '%s' is currently disabled and cannot be cleared",
2915 name);
2916 return;
2917 } else if (bdrv_dirty_bitmap_readonly(bitmap)) {
2918 error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name);
2919 return;
2920 }
2921
2922 bdrv_clear_dirty_bitmap(bitmap, NULL);
2923 }
2924
2925 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2926 const char *name,
2927 Error **errp)
2928 {
2929 BdrvDirtyBitmap *bitmap;
2930 BlockDriverState *bs;
2931 BlockDirtyBitmapSha256 *ret = NULL;
2932 char *sha256;
2933
2934 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2935 if (!bitmap || !bs) {
2936 return NULL;
2937 }
2938
2939 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2940 if (sha256 == NULL) {
2941 return NULL;
2942 }
2943
2944 ret = g_new(BlockDirtyBitmapSha256, 1);
2945 ret->sha256 = sha256;
2946
2947 return ret;
2948 }
2949
2950 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2951 {
2952 const char *id = qdict_get_str(qdict, "id");
2953 BlockBackend *blk;
2954 BlockDriverState *bs;
2955 AioContext *aio_context;
2956 Error *local_err = NULL;
2957
2958 bs = bdrv_find_node(id);
2959 if (bs) {
2960 qmp_blockdev_del(id, &local_err);
2961 if (local_err) {
2962 error_report_err(local_err);
2963 }
2964 return;
2965 }
2966
2967 blk = blk_by_name(id);
2968 if (!blk) {
2969 error_report("Device '%s' not found", id);
2970 return;
2971 }
2972
2973 if (!blk_legacy_dinfo(blk)) {
2974 error_report("Deleting device added with blockdev-add"
2975 " is not supported");
2976 return;
2977 }
2978
2979 aio_context = blk_get_aio_context(blk);
2980 aio_context_acquire(aio_context);
2981
2982 bs = blk_bs(blk);
2983 if (bs) {
2984 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2985 error_report_err(local_err);
2986 aio_context_release(aio_context);
2987 return;
2988 }
2989
2990 blk_remove_bs(blk);
2991 }
2992
2993 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2994 monitor_remove_blk(blk);
2995
2996 /* If this BlockBackend has a device attached to it, its refcount will be
2997 * decremented when the device is removed; otherwise we have to do so here.
2998 */
2999 if (blk_get_attached_dev(blk)) {
3000 /* Further I/O must not pause the guest */
3001 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
3002 BLOCKDEV_ON_ERROR_REPORT);
3003 } else {
3004 blk_unref(blk);
3005 }
3006
3007 aio_context_release(aio_context);
3008 }
3009
3010 void qmp_block_resize(bool has_device, const char *device,
3011 bool has_node_name, const char *node_name,
3012 int64_t size, Error **errp)
3013 {
3014 Error *local_err = NULL;
3015 BlockBackend *blk = NULL;
3016 BlockDriverState *bs;
3017 AioContext *aio_context;
3018 int ret;
3019
3020 bs = bdrv_lookup_bs(has_device ? device : NULL,
3021 has_node_name ? node_name : NULL,
3022 &local_err);
3023 if (local_err) {
3024 error_propagate(errp, local_err);
3025 return;
3026 }
3027
3028 aio_context = bdrv_get_aio_context(bs);
3029 aio_context_acquire(aio_context);
3030
3031 if (!bdrv_is_first_non_filter(bs)) {
3032 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
3033 goto out;
3034 }
3035
3036 if (size < 0) {
3037 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
3038 goto out;
3039 }
3040
3041 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
3042 error_setg(errp, QERR_DEVICE_IN_USE, device);
3043 goto out;
3044 }
3045
3046 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
3047 ret = blk_insert_bs(blk, bs, errp);
3048 if (ret < 0) {
3049 goto out;
3050 }
3051
3052 bdrv_drained_begin(bs);
3053 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
3054 bdrv_drained_end(bs);
3055
3056 out:
3057 blk_unref(blk);
3058 aio_context_release(aio_context);
3059 }
3060
3061 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
3062 bool has_base, const char *base,
3063 bool has_base_node, const char *base_node,
3064 bool has_backing_file, const char *backing_file,
3065 bool has_speed, int64_t speed,
3066 bool has_on_error, BlockdevOnError on_error,
3067 Error **errp)
3068 {
3069 BlockDriverState *bs, *iter;
3070 BlockDriverState *base_bs = NULL;
3071 AioContext *aio_context;
3072 Error *local_err = NULL;
3073 const char *base_name = NULL;
3074
3075 if (!has_on_error) {
3076 on_error = BLOCKDEV_ON_ERROR_REPORT;
3077 }
3078
3079 bs = bdrv_lookup_bs(device, device, errp);
3080 if (!bs) {
3081 return;
3082 }
3083
3084 aio_context = bdrv_get_aio_context(bs);
3085 aio_context_acquire(aio_context);
3086
3087 if (has_base && has_base_node) {
3088 error_setg(errp, "'base' and 'base-node' cannot be specified "
3089 "at the same time");
3090 goto out;
3091 }
3092
3093 if (has_base) {
3094 base_bs = bdrv_find_backing_image(bs, base);
3095 if (base_bs == NULL) {
3096 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3097 goto out;
3098 }
3099 assert(bdrv_get_aio_context(base_bs) == aio_context);
3100 base_name = base;
3101 }
3102
3103 if (has_base_node) {
3104 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3105 if (!base_bs) {
3106 goto out;
3107 }
3108 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
3109 error_setg(errp, "Node '%s' is not a backing image of '%s'",
3110 base_node, device);
3111 goto out;
3112 }
3113 assert(bdrv_get_aio_context(base_bs) == aio_context);
3114 base_name = base_bs->filename;
3115 }
3116
3117 /* Check for op blockers in the whole chain between bs and base */
3118 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
3119 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
3120 goto out;
3121 }
3122 }
3123
3124 /* if we are streaming the entire chain, the result will have no backing
3125 * file, and specifying one is therefore an error */
3126 if (base_bs == NULL && has_backing_file) {
3127 error_setg(errp, "backing file specified, but streaming the "
3128 "entire chain");
3129 goto out;
3130 }
3131
3132 /* backing_file string overrides base bs filename */
3133 base_name = has_backing_file ? backing_file : base_name;
3134
3135 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
3136 has_speed ? speed : 0, on_error, &local_err);
3137 if (local_err) {
3138 error_propagate(errp, local_err);
3139 goto out;
3140 }
3141
3142 trace_qmp_block_stream(bs, bs->job);
3143
3144 out:
3145 aio_context_release(aio_context);
3146 }
3147
3148 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3149 bool has_base, const char *base,
3150 bool has_top, const char *top,
3151 bool has_backing_file, const char *backing_file,
3152 bool has_speed, int64_t speed,
3153 bool has_filter_node_name, const char *filter_node_name,
3154 Error **errp)
3155 {
3156 BlockDriverState *bs;
3157 BlockDriverState *iter;
3158 BlockDriverState *base_bs, *top_bs;
3159 AioContext *aio_context;
3160 Error *local_err = NULL;
3161 /* This will be part of the QMP command, if/when the
3162 * BlockdevOnError change for blkmirror makes it in
3163 */
3164 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3165
3166 if (!has_speed) {
3167 speed = 0;
3168 }
3169 if (!has_filter_node_name) {
3170 filter_node_name = NULL;
3171 }
3172
3173 /* Important Note:
3174 * libvirt relies on the DeviceNotFound error class in order to probe for
3175 * live commit feature versions; for this to work, we must make sure to
3176 * perform the device lookup before any generic errors that may occur in a
3177 * scenario in which all optional arguments are omitted. */
3178 bs = qmp_get_root_bs(device, &local_err);
3179 if (!bs) {
3180 bs = bdrv_lookup_bs(device, device, NULL);
3181 if (!bs) {
3182 error_free(local_err);
3183 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3184 "Device '%s' not found", device);
3185 } else {
3186 error_propagate(errp, local_err);
3187 }
3188 return;
3189 }
3190
3191 aio_context = bdrv_get_aio_context(bs);
3192 aio_context_acquire(aio_context);
3193
3194 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3195 goto out;
3196 }
3197
3198 /* default top_bs is the active layer */
3199 top_bs = bs;
3200
3201 if (has_top && top) {
3202 if (strcmp(bs->filename, top) != 0) {
3203 top_bs = bdrv_find_backing_image(bs, top);
3204 }
3205 }
3206
3207 if (top_bs == NULL) {
3208 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3209 goto out;
3210 }
3211
3212 assert(bdrv_get_aio_context(top_bs) == aio_context);
3213
3214 if (has_base && base) {
3215 base_bs = bdrv_find_backing_image(top_bs, base);
3216 } else {
3217 base_bs = bdrv_find_base(top_bs);
3218 }
3219
3220 if (base_bs == NULL) {
3221 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3222 goto out;
3223 }
3224
3225 assert(bdrv_get_aio_context(base_bs) == aio_context);
3226
3227 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
3228 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3229 goto out;
3230 }
3231 }
3232
3233 /* Do not allow attempts to commit an image into itself */
3234 if (top_bs == base_bs) {
3235 error_setg(errp, "cannot commit an image into itself");
3236 goto out;
3237 }
3238
3239 if (top_bs == bs) {
3240 if (has_backing_file) {
3241 error_setg(errp, "'backing-file' specified,"
3242 " but 'top' is the active layer");
3243 goto out;
3244 }
3245 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3246 BLOCK_JOB_DEFAULT, speed, on_error,
3247 filter_node_name, NULL, NULL, false, &local_err);
3248 } else {
3249 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
3250 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3251 goto out;
3252 }
3253 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed,
3254 on_error, has_backing_file ? backing_file : NULL,
3255 filter_node_name, &local_err);
3256 }
3257 if (local_err != NULL) {
3258 error_propagate(errp, local_err);
3259 goto out;
3260 }
3261
3262 out:
3263 aio_context_release(aio_context);
3264 }
3265
3266 static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
3267 Error **errp)
3268 {
3269 BlockDriverState *bs;
3270 BlockDriverState *target_bs;
3271 BlockDriverState *source = NULL;
3272 BlockJob *job = NULL;
3273 BdrvDirtyBitmap *bmap = NULL;
3274 AioContext *aio_context;
3275 QDict *options = NULL;
3276 Error *local_err = NULL;
3277 int flags;
3278 int64_t size;
3279 bool set_backing_hd = false;
3280
3281 if (!backup->has_speed) {
3282 backup->speed = 0;
3283 }
3284 if (!backup->has_on_source_error) {
3285 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3286 }
3287 if (!backup->has_on_target_error) {
3288 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3289 }
3290 if (!backup->has_mode) {
3291 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3292 }
3293 if (!backup->has_job_id) {
3294 backup->job_id = NULL;
3295 }
3296 if (!backup->has_compress) {
3297 backup->compress = false;
3298 }
3299
3300 bs = qmp_get_root_bs(backup->device, errp);
3301 if (!bs) {
3302 return NULL;
3303 }
3304
3305 aio_context = bdrv_get_aio_context(bs);
3306 aio_context_acquire(aio_context);
3307
3308 if (!backup->has_format) {
3309 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
3310 NULL : (char*) bs->drv->format_name;
3311 }
3312
3313 /* Early check to avoid creating target */
3314 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3315 goto out;
3316 }
3317
3318 flags = bs->open_flags | BDRV_O_RDWR;
3319
3320 /* See if we have a backing HD we can use to create our new image
3321 * on top of. */
3322 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3323 source = backing_bs(bs);
3324 if (!source) {
3325 backup->sync = MIRROR_SYNC_MODE_FULL;
3326 }
3327 }
3328 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3329 source = bs;
3330 flags |= BDRV_O_NO_BACKING;
3331 set_backing_hd = true;
3332 }
3333
3334 size = bdrv_getlength(bs);
3335 if (size < 0) {
3336 error_setg_errno(errp, -size, "bdrv_getlength failed");
3337 goto out;
3338 }
3339
3340 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
3341 assert(backup->format);
3342 if (source) {
3343 bdrv_img_create(backup->target, backup->format, source->filename,
3344 source->drv->format_name, NULL,
3345 size, flags, false, &local_err);
3346 } else {
3347 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
3348 size, flags, false, &local_err);
3349 }
3350 }
3351
3352 if (local_err) {
3353 error_propagate(errp, local_err);
3354 goto out;
3355 }
3356
3357 if (backup->format) {
3358 if (!options) {
3359 options = qdict_new();
3360 }
3361 qdict_put_str(options, "driver", backup->format);
3362 }
3363
3364 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
3365 if (!target_bs) {
3366 goto out;
3367 }
3368
3369 bdrv_set_aio_context(target_bs, aio_context);
3370
3371 if (set_backing_hd) {
3372 bdrv_set_backing_hd(target_bs, source, &local_err);
3373 if (local_err) {
3374 bdrv_unref(target_bs);
3375 goto out;
3376 }
3377 }
3378
3379 if (backup->has_bitmap) {
3380 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3381 if (!bmap) {
3382 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3383 bdrv_unref(target_bs);
3384 goto out;
3385 }
3386 if (bdrv_dirty_bitmap_qmp_locked(bmap)) {
3387 error_setg(errp,
3388 "Bitmap '%s' is currently locked and cannot be used for "
3389 "backup", backup->bitmap);
3390 goto out;
3391 }
3392 }
3393
3394 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3395 backup->sync, bmap, backup->compress,
3396 backup->on_source_error, backup->on_target_error,
3397 BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err);
3398 bdrv_unref(target_bs);
3399 if (local_err != NULL) {
3400 error_propagate(errp, local_err);
3401 goto out;
3402 }
3403
3404 out:
3405 aio_context_release(aio_context);
3406 return job;
3407 }
3408
3409 void qmp_drive_backup(DriveBackup *arg, Error **errp)
3410 {
3411
3412 BlockJob *job;
3413 job = do_drive_backup(arg, NULL, errp);
3414 if (job) {
3415 block_job_start(job);
3416 }
3417 }
3418
3419 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3420 {
3421 return bdrv_named_nodes_list(errp);
3422 }
3423
3424 BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn,
3425 Error **errp)
3426 {
3427 BlockDriverState *bs;
3428 BlockDriverState *target_bs;
3429 Error *local_err = NULL;
3430 AioContext *aio_context;
3431 BlockJob *job = NULL;
3432
3433 if (!backup->has_speed) {
3434 backup->speed = 0;
3435 }
3436 if (!backup->has_on_source_error) {
3437 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3438 }
3439 if (!backup->has_on_target_error) {
3440 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3441 }
3442 if (!backup->has_job_id) {
3443 backup->job_id = NULL;
3444 }
3445 if (!backup->has_compress) {
3446 backup->compress = false;
3447 }
3448
3449 bs = qmp_get_root_bs(backup->device, errp);
3450 if (!bs) {
3451 return NULL;
3452 }
3453
3454 aio_context = bdrv_get_aio_context(bs);
3455 aio_context_acquire(aio_context);
3456
3457 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
3458 if (!target_bs) {
3459 goto out;
3460 }
3461
3462 if (bdrv_get_aio_context(target_bs) != aio_context) {
3463 if (!bdrv_has_blk(target_bs)) {
3464 /* The target BDS is not attached, we can safely move it to another
3465 * AioContext. */
3466 bdrv_set_aio_context(target_bs, aio_context);
3467 } else {
3468 error_setg(errp, "Target is attached to a different thread from "
3469 "source.");
3470 goto out;
3471 }
3472 }
3473 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3474 backup->sync, NULL, backup->compress,
3475 backup->on_source_error, backup->on_target_error,
3476 BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err);
3477 if (local_err != NULL) {
3478 error_propagate(errp, local_err);
3479 }
3480 out:
3481 aio_context_release(aio_context);
3482 return job;
3483 }
3484
3485 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
3486 {
3487 BlockJob *job;
3488 job = do_blockdev_backup(arg, NULL, errp);
3489 if (job) {
3490 block_job_start(job);
3491 }
3492 }
3493
3494 /* Parameter check and block job starting for drive mirroring.
3495 * Caller should hold @device and @target's aio context (must be the same).
3496 **/
3497 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3498 BlockDriverState *target,
3499 bool has_replaces, const char *replaces,
3500 enum MirrorSyncMode sync,
3501 BlockMirrorBackingMode backing_mode,
3502 bool has_speed, int64_t speed,
3503 bool has_granularity, uint32_t granularity,
3504 bool has_buf_size, int64_t buf_size,
3505 bool has_on_source_error,
3506 BlockdevOnError on_source_error,
3507 bool has_on_target_error,
3508 BlockdevOnError on_target_error,
3509 bool has_unmap, bool unmap,
3510 bool has_filter_node_name,
3511 const char *filter_node_name,
3512 Error **errp)
3513 {
3514
3515 if (!has_speed) {
3516 speed = 0;
3517 }
3518 if (!has_on_source_error) {
3519 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3520 }
3521 if (!has_on_target_error) {
3522 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3523 }
3524 if (!has_granularity) {
3525 granularity = 0;
3526 }
3527 if (!has_buf_size) {
3528 buf_size = 0;
3529 }
3530 if (!has_unmap) {
3531 unmap = true;
3532 }
3533 if (!has_filter_node_name) {
3534 filter_node_name = NULL;
3535 }
3536
3537 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3538 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3539 "a value in range [512B, 64MB]");
3540 return;
3541 }
3542 if (granularity & (granularity - 1)) {
3543 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3544 "power of 2");
3545 return;
3546 }
3547
3548 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3549 return;
3550 }
3551 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3552 return;
3553 }
3554
3555 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3556 sync = MIRROR_SYNC_MODE_FULL;
3557 }
3558
3559 /* pass the node name to replace to mirror start since it's loose coupling
3560 * and will allow to check whether the node still exist at mirror completion
3561 */
3562 mirror_start(job_id, bs, target,
3563 has_replaces ? replaces : NULL,
3564 speed, granularity, buf_size, sync, backing_mode,
3565 on_source_error, on_target_error, unmap, filter_node_name,
3566 errp);
3567 }
3568
3569 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3570 {
3571 BlockDriverState *bs;
3572 BlockDriverState *source, *target_bs;
3573 AioContext *aio_context;
3574 BlockMirrorBackingMode backing_mode;
3575 Error *local_err = NULL;
3576 QDict *options = NULL;
3577 int flags;
3578 int64_t size;
3579 const char *format = arg->format;
3580
3581 bs = qmp_get_root_bs(arg->device, errp);
3582 if (!bs) {
3583 return;
3584 }
3585
3586 /* Early check to avoid creating target */
3587 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3588 return;
3589 }
3590
3591 aio_context = bdrv_get_aio_context(bs);
3592 aio_context_acquire(aio_context);
3593
3594 if (!arg->has_mode) {
3595 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3596 }
3597
3598 if (!arg->has_format) {
3599 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3600 ? NULL : bs->drv->format_name);
3601 }
3602
3603 flags = bs->open_flags | BDRV_O_RDWR;
3604 source = backing_bs(bs);
3605 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
3606 arg->sync = MIRROR_SYNC_MODE_FULL;
3607 }
3608 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3609 source = bs;
3610 }
3611
3612 size = bdrv_getlength(bs);
3613 if (size < 0) {
3614 error_setg_errno(errp, -size, "bdrv_getlength failed");
3615 goto out;
3616 }
3617
3618 if (arg->has_replaces) {
3619 BlockDriverState *to_replace_bs;
3620 AioContext *replace_aio_context;
3621 int64_t replace_size;
3622
3623 if (!arg->has_node_name) {
3624 error_setg(errp, "a node-name must be provided when replacing a"
3625 " named node of the graph");
3626 goto out;
3627 }
3628
3629 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
3630
3631 if (!to_replace_bs) {
3632 error_propagate(errp, local_err);
3633 goto out;
3634 }
3635
3636 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3637 aio_context_acquire(replace_aio_context);
3638 replace_size = bdrv_getlength(to_replace_bs);
3639 aio_context_release(replace_aio_context);
3640
3641 if (size != replace_size) {
3642 error_setg(errp, "cannot replace image with a mirror image of "
3643 "different size");
3644 goto out;
3645 }
3646 }
3647
3648 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3649 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3650 } else {
3651 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3652 }
3653
3654 /* Don't open backing image in create() */
3655 flags |= BDRV_O_NO_BACKING;
3656
3657 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
3658 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3659 {
3660 /* create new image w/o backing file */
3661 assert(format);
3662 bdrv_img_create(arg->target, format,
3663 NULL, NULL, NULL, size, flags, false, &local_err);
3664 } else {
3665 switch (arg->mode) {
3666 case NEW_IMAGE_MODE_EXISTING:
3667 break;
3668 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3669 /* create new image with backing file */
3670 bdrv_img_create(arg->target, format,
3671 source->filename,
3672 source->drv->format_name,
3673 NULL, size, flags, false, &local_err);
3674 break;
3675 default:
3676 abort();
3677 }
3678 }
3679
3680 if (local_err) {
3681 error_propagate(errp, local_err);
3682 goto out;
3683 }
3684
3685 options = qdict_new();
3686 if (arg->has_node_name) {
3687 qdict_put_str(options, "node-name", arg->node_name);
3688 }
3689 if (format) {
3690 qdict_put_str(options, "driver", format);
3691 }
3692
3693 /* Mirroring takes care of copy-on-write using the source's backing
3694 * file.
3695 */
3696 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3697 if (!target_bs) {
3698 goto out;
3699 }
3700
3701 bdrv_set_aio_context(target_bs, aio_context);
3702
3703 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3704 arg->has_replaces, arg->replaces, arg->sync,
3705 backing_mode, arg->has_speed, arg->speed,
3706 arg->has_granularity, arg->granularity,
3707 arg->has_buf_size, arg->buf_size,
3708 arg->has_on_source_error, arg->on_source_error,
3709 arg->has_on_target_error, arg->on_target_error,
3710 arg->has_unmap, arg->unmap,
3711 false, NULL,
3712 &local_err);
3713 bdrv_unref(target_bs);
3714 error_propagate(errp, local_err);
3715 out:
3716 aio_context_release(aio_context);
3717 }
3718
3719 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3720 const char *device, const char *target,
3721 bool has_replaces, const char *replaces,
3722 MirrorSyncMode sync,
3723 bool has_speed, int64_t speed,
3724 bool has_granularity, uint32_t granularity,
3725 bool has_buf_size, int64_t buf_size,
3726 bool has_on_source_error,
3727 BlockdevOnError on_source_error,
3728 bool has_on_target_error,
3729 BlockdevOnError on_target_error,
3730 bool has_filter_node_name,
3731 const char *filter_node_name,
3732 Error **errp)
3733 {
3734 BlockDriverState *bs;
3735 BlockDriverState *target_bs;
3736 AioContext *aio_context;
3737 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3738 Error *local_err = NULL;
3739
3740 bs = qmp_get_root_bs(device, errp);
3741 if (!bs) {
3742 return;
3743 }
3744
3745 target_bs = bdrv_lookup_bs(target, target, errp);
3746 if (!target_bs) {
3747 return;
3748 }
3749
3750 aio_context = bdrv_get_aio_context(bs);
3751 aio_context_acquire(aio_context);
3752
3753 bdrv_set_aio_context(target_bs, aio_context);
3754
3755 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3756 has_replaces, replaces, sync, backing_mode,
3757 has_speed, speed,
3758 has_granularity, granularity,
3759 has_buf_size, buf_size,
3760 has_on_source_error, on_source_error,
3761 has_on_target_error, on_target_error,
3762 true, true,
3763 has_filter_node_name, filter_node_name,
3764 &local_err);
3765 error_propagate(errp, local_err);
3766
3767 aio_context_release(aio_context);
3768 }
3769
3770 /* Get a block job using its ID and acquire its AioContext */
3771 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3772 Error **errp)
3773 {
3774 BlockJob *job;
3775
3776 assert(id != NULL);
3777
3778 *aio_context = NULL;
3779
3780 job = block_job_get(id);
3781
3782 if (!job) {
3783 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3784 "Block job '%s' not found", id);
3785 return NULL;
3786 }
3787
3788 *aio_context = blk_get_aio_context(job->blk);
3789 aio_context_acquire(*aio_context);
3790
3791 return job;
3792 }
3793
3794 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3795 {
3796 AioContext *aio_context;
3797 BlockJob *job = find_block_job(device, &aio_context, errp);
3798
3799 if (!job) {
3800 return;
3801 }
3802
3803 block_job_set_speed(job, speed, errp);
3804 aio_context_release(aio_context);
3805 }
3806
3807 void qmp_block_job_cancel(const char *device,
3808 bool has_force, bool force, Error **errp)
3809 {
3810 AioContext *aio_context;
3811 BlockJob *job = find_block_job(device, &aio_context, errp);
3812
3813 if (!job) {
3814 return;
3815 }
3816
3817 if (!has_force) {
3818 force = false;
3819 }
3820
3821 if (block_job_user_paused(job) && !force) {
3822 error_setg(errp, "The block job for device '%s' is currently paused",
3823 device);
3824 goto out;
3825 }
3826
3827 trace_qmp_block_job_cancel(job);
3828 block_job_cancel(job);
3829 out:
3830 aio_context_release(aio_context);
3831 }
3832
3833 void qmp_block_job_pause(const char *device, Error **errp)
3834 {
3835 AioContext *aio_context;
3836 BlockJob *job = find_block_job(device, &aio_context, errp);
3837
3838 if (!job || block_job_user_paused(job)) {
3839 return;
3840 }
3841
3842 trace_qmp_block_job_pause(job);
3843 block_job_user_pause(job);
3844 aio_context_release(aio_context);
3845 }
3846
3847 void qmp_block_job_resume(const char *device, Error **errp)
3848 {
3849 AioContext *aio_context;
3850 BlockJob *job = find_block_job(device, &aio_context, errp);
3851
3852 if (!job || !block_job_user_paused(job)) {
3853 return;
3854 }
3855
3856 trace_qmp_block_job_resume(job);
3857 block_job_user_resume(job);
3858 aio_context_release(aio_context);
3859 }
3860
3861 void qmp_block_job_complete(const char *device, Error **errp)
3862 {
3863 AioContext *aio_context;
3864 BlockJob *job = find_block_job(device, &aio_context, errp);
3865
3866 if (!job) {
3867 return;
3868 }
3869
3870 trace_qmp_block_job_complete(job);
3871 block_job_complete(job, errp);
3872 aio_context_release(aio_context);
3873 }
3874
3875 void qmp_change_backing_file(const char *device,
3876 const char *image_node_name,
3877 const char *backing_file,
3878 Error **errp)
3879 {
3880 BlockDriverState *bs = NULL;
3881 AioContext *aio_context;
3882 BlockDriverState *image_bs = NULL;
3883 Error *local_err = NULL;
3884 bool ro;
3885 int open_flags;
3886 int ret;
3887
3888 bs = qmp_get_root_bs(device, errp);
3889 if (!bs) {
3890 return;
3891 }
3892
3893 aio_context = bdrv_get_aio_context(bs);
3894 aio_context_acquire(aio_context);
3895
3896 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3897 if (local_err) {
3898 error_propagate(errp, local_err);
3899 goto out;
3900 }
3901
3902 if (!image_bs) {
3903 error_setg(errp, "image file not found");
3904 goto out;
3905 }
3906
3907 if (bdrv_find_base(image_bs) == image_bs) {
3908 error_setg(errp, "not allowing backing file change on an image "
3909 "without a backing file");
3910 goto out;
3911 }
3912
3913 /* even though we are not necessarily operating on bs, we need it to
3914 * determine if block ops are currently prohibited on the chain */
3915 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3916 goto out;
3917 }
3918
3919 /* final sanity check */
3920 if (!bdrv_chain_contains(bs, image_bs)) {
3921 error_setg(errp, "'%s' and image file are not in the same chain",
3922 device);
3923 goto out;
3924 }
3925
3926 /* if not r/w, reopen to make r/w */
3927 open_flags = image_bs->open_flags;
3928 ro = bdrv_is_read_only(image_bs);
3929
3930 if (ro) {
3931 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3932 if (local_err) {
3933 error_propagate(errp, local_err);
3934 goto out;
3935 }
3936 }
3937
3938 ret = bdrv_change_backing_file(image_bs, backing_file,
3939 image_bs->drv ? image_bs->drv->format_name : "");
3940
3941 if (ret < 0) {
3942 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3943 backing_file);
3944 /* don't exit here, so we can try to restore open flags if
3945 * appropriate */
3946 }
3947
3948 if (ro) {
3949 bdrv_reopen(image_bs, open_flags, &local_err);
3950 error_propagate(errp, local_err);
3951 }
3952
3953 out:
3954 aio_context_release(aio_context);
3955 }
3956
3957 void hmp_drive_add_node(Monitor *mon, const char *optstr)
3958 {
3959 QemuOpts *opts;
3960 QDict *qdict;
3961 Error *local_err = NULL;
3962
3963 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
3964 if (!opts) {
3965 return;
3966 }
3967
3968 qdict = qemu_opts_to_qdict(opts, NULL);
3969
3970 if (!qdict_get_try_str(qdict, "node-name")) {
3971 QDECREF(qdict);
3972 error_report("'node-name' needs to be specified");
3973 goto out;
3974 }
3975
3976 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
3977 if (!bs) {
3978 error_report_err(local_err);
3979 goto out;
3980 }
3981
3982 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3983
3984 out:
3985 qemu_opts_del(opts);
3986 }
3987
3988 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3989 {
3990 BlockDriverState *bs;
3991 QObject *obj;
3992 Visitor *v = qobject_output_visitor_new(&obj);
3993 QDict *qdict;
3994 const QDictEntry *ent;
3995 Error *local_err = NULL;
3996
3997 visit_type_BlockdevOptions(v, NULL, &options, &local_err);
3998 if (local_err) {
3999 error_propagate(errp, local_err);
4000 goto fail;
4001 }
4002
4003 visit_complete(v, &obj);
4004 qdict = qobject_to_qdict(obj);
4005
4006 qdict_flatten(qdict);
4007
4008 /*
4009 * Rewrite "backing": null to "backing": ""
4010 * TODO Rewrite "" to null instead, and perhaps not even here
4011 */
4012 for (ent = qdict_first(qdict); ent; ent = qdict_next(qdict, ent)) {
4013 char *dot = strrchr(ent->key, '.');
4014
4015 if (!strcmp(dot ? dot + 1 : ent->key, "backing")
4016 && qobject_type(ent->value) == QTYPE_QNULL) {
4017 qdict_put(qdict, ent->key, qstring_new());
4018 }
4019 }
4020
4021 if (!qdict_get_try_str(qdict, "node-name")) {
4022 error_setg(errp, "'node-name' must be specified for the root node");
4023 goto fail;
4024 }
4025
4026 bs = bds_tree_init(qdict, errp);
4027 if (!bs) {
4028 goto fail;
4029 }
4030
4031 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4032
4033 fail:
4034 visit_free(v);
4035 }
4036
4037 void qmp_blockdev_del(const char *node_name, Error **errp)
4038 {
4039 AioContext *aio_context;
4040 BlockDriverState *bs;
4041
4042 bs = bdrv_find_node(node_name);
4043 if (!bs) {
4044 error_setg(errp, "Cannot find node %s", node_name);
4045 return;
4046 }
4047 if (bdrv_has_blk(bs)) {
4048 error_setg(errp, "Node %s is in use", node_name);
4049 return;
4050 }
4051 aio_context = bdrv_get_aio_context(bs);
4052 aio_context_acquire(aio_context);
4053
4054 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4055 goto out;
4056 }
4057
4058 if (!bs->monitor_list.tqe_prev) {
4059 error_setg(errp, "Node %s is not owned by the monitor",
4060 bs->node_name);
4061 goto out;
4062 }
4063
4064 if (bs->refcnt > 1) {
4065 error_setg(errp, "Block device %s is in use",
4066 bdrv_get_device_or_node_name(bs));
4067 goto out;
4068 }
4069
4070 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4071 bdrv_unref(bs);
4072
4073 out:
4074 aio_context_release(aio_context);
4075 }
4076
4077 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
4078 const char *child_name)
4079 {
4080 BdrvChild *child;
4081
4082 QLIST_FOREACH(child, &parent_bs->children, next) {
4083 if (strcmp(child->name, child_name) == 0) {
4084 return child;
4085 }
4086 }
4087
4088 return NULL;
4089 }
4090
4091 void qmp_x_blockdev_change(const char *parent, bool has_child,
4092 const char *child, bool has_node,
4093 const char *node, Error **errp)
4094 {
4095 BlockDriverState *parent_bs, *new_bs = NULL;
4096 BdrvChild *p_child;
4097
4098 parent_bs = bdrv_lookup_bs(parent, parent, errp);
4099 if (!parent_bs) {
4100 return;
4101 }
4102
4103 if (has_child == has_node) {
4104 if (has_child) {
4105 error_setg(errp, "The parameters child and node are in conflict");
4106 } else {
4107 error_setg(errp, "Either child or node must be specified");
4108 }
4109 return;
4110 }
4111
4112 if (has_child) {
4113 p_child = bdrv_find_child(parent_bs, child);
4114 if (!p_child) {
4115 error_setg(errp, "Node '%s' does not have child '%s'",
4116 parent, child);
4117 return;
4118 }
4119 bdrv_del_child(parent_bs, p_child, errp);
4120 }
4121
4122 if (has_node) {
4123 new_bs = bdrv_find_node(node);
4124 if (!new_bs) {
4125 error_setg(errp, "Node '%s' not found", node);
4126 return;
4127 }
4128 bdrv_add_child(parent_bs, new_bs, errp);
4129 }
4130 }
4131
4132 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4133 {
4134 BlockJobInfoList *head = NULL, **p_next = &head;
4135 BlockJob *job;
4136
4137 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
4138 BlockJobInfoList *elem;
4139 AioContext *aio_context;
4140
4141 if (block_job_is_internal(job)) {
4142 continue;
4143 }
4144 elem = g_new0(BlockJobInfoList, 1);
4145 aio_context = blk_get_aio_context(job->blk);
4146 aio_context_acquire(aio_context);
4147 elem->value = block_job_query(job, errp);
4148 aio_context_release(aio_context);
4149 if (!elem->value) {
4150 g_free(elem);
4151 qapi_free_BlockJobInfoList(head);
4152 return NULL;
4153 }
4154 *p_next = elem;
4155 p_next = &elem->next;
4156 }
4157
4158 return head;
4159 }
4160
4161 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
4162 bool has_force, bool force, Error **errp)
4163 {
4164 AioContext *old_context;
4165 AioContext *new_context;
4166 BlockDriverState *bs;
4167
4168 bs = bdrv_find_node(node_name);
4169 if (!bs) {
4170 error_setg(errp, "Cannot find node %s", node_name);
4171 return;
4172 }
4173
4174 /* Protects against accidents. */
4175 if (!(has_force && force) && bdrv_has_blk(bs)) {
4176 error_setg(errp, "Node %s is associated with a BlockBackend and could "
4177 "be in use (use force=true to override this check)",
4178 node_name);
4179 return;
4180 }
4181
4182 if (iothread->type == QTYPE_QSTRING) {
4183 IOThread *obj = iothread_by_id(iothread->u.s);
4184 if (!obj) {
4185 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
4186 return;
4187 }
4188
4189 new_context = iothread_get_aio_context(obj);
4190 } else {
4191 new_context = qemu_get_aio_context();
4192 }
4193
4194 old_context = bdrv_get_aio_context(bs);
4195 aio_context_acquire(old_context);
4196
4197 bdrv_set_aio_context(bs, new_context);
4198
4199 aio_context_release(old_context);
4200 }
4201
4202 QemuOptsList qemu_common_drive_opts = {
4203 .name = "drive",
4204 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4205 .desc = {
4206 {
4207 .name = "snapshot",
4208 .type = QEMU_OPT_BOOL,
4209 .help = "enable/disable snapshot mode",
4210 },{
4211 .name = "aio",
4212 .type = QEMU_OPT_STRING,
4213 .help = "host AIO implementation (threads, native)",
4214 },{
4215 .name = BDRV_OPT_CACHE_WB,
4216 .type = QEMU_OPT_BOOL,
4217 .help = "Enable writeback mode",
4218 },{
4219 .name = "format",
4220 .type = QEMU_OPT_STRING,
4221 .help = "disk format (raw, qcow2, ...)",
4222 },{
4223 .name = "rerror",
4224 .type = QEMU_OPT_STRING,
4225 .help = "read error action",
4226 },{
4227 .name = "werror",
4228 .type = QEMU_OPT_STRING,
4229 .help = "write error action",
4230 },{
4231 .name = BDRV_OPT_READ_ONLY,
4232 .type = QEMU_OPT_BOOL,
4233 .help = "open drive file as read-only",
4234 },
4235
4236 THROTTLE_OPTS,
4237
4238 {
4239 .name = "throttling.group",
4240 .type = QEMU_OPT_STRING,
4241 .help = "name of the block throttling group",
4242 },{
4243 .name = "copy-on-read",
4244 .type = QEMU_OPT_BOOL,
4245 .help = "copy read data from backing file into image file",
4246 },{
4247 .name = "detect-zeroes",
4248 .type = QEMU_OPT_STRING,
4249 .help = "try to optimize zero writes (off, on, unmap)",
4250 },{
4251 .name = "stats-account-invalid",
4252 .type = QEMU_OPT_BOOL,
4253 .help = "whether to account for invalid I/O operations "
4254 "in the statistics",
4255 },{
4256 .name = "stats-account-failed",
4257 .type = QEMU_OPT_BOOL,
4258 .help = "whether to account for failed I/O operations "
4259 "in the statistics",
4260 },
4261 { /* end of list */ }
4262 },
4263 };
4264
4265 QemuOptsList qemu_drive_opts = {
4266 .name = "drive",
4267 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4268 .desc = {
4269 /*
4270 * no elements => accept any params
4271 * validation will happen later
4272 */
4273 { /* end of list */ }
4274 },
4275 };
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