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block: an interoperability test for luks vs dm-crypt/cryptsetup
[qemu/ar7.git] / blockdev.c
blobd8e3e31975346b934e435bc721fec9b028665e13
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "qemu/osdep.h"
34 #include "sysemu/block-backend.h"
35 #include "sysemu/blockdev.h"
36 #include "hw/block/block.h"
37 #include "block/blockjob.h"
38 #include "block/throttle-groups.h"
39 #include "monitor/monitor.h"
40 #include "qemu/error-report.h"
41 #include "qemu/option.h"
42 #include "qemu/config-file.h"
43 #include "qapi/qmp/types.h"
44 #include "qapi-visit.h"
45 #include "qapi/qmp/qerror.h"
46 #include "qapi/qmp-output-visitor.h"
47 #include "qapi/util.h"
48 #include "sysemu/sysemu.h"
49 #include "block/block_int.h"
50 #include "qmp-commands.h"
51 #include "trace.h"
52 #include "sysemu/arch_init.h"
53 #include "qemu/cutils.h"
54 #include "qemu/help_option.h"
55
56 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
57 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
58
59 static const char *const if_name[IF_COUNT] = {
60 [IF_NONE] = "none",
61 [IF_IDE] = "ide",
62 [IF_SCSI] = "scsi",
63 [IF_FLOPPY] = "floppy",
64 [IF_PFLASH] = "pflash",
65 [IF_MTD] = "mtd",
66 [IF_SD] = "sd",
67 [IF_VIRTIO] = "virtio",
68 [IF_XEN] = "xen",
69 };
70
71 static int if_max_devs[IF_COUNT] = {
72 /*
73 * Do not change these numbers! They govern how drive option
74 * index maps to unit and bus. That mapping is ABI.
75 *
76 * All controllers used to imlement if=T drives need to support
77 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
78 * Otherwise, some index values map to "impossible" bus, unit
79 * values.
80 *
81 * For instance, if you change [IF_SCSI] to 255, -drive
82 * if=scsi,index=12 no longer means bus=1,unit=5, but
83 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
84 * the drive can't be set up. Regression.
85 */
86 [IF_IDE] = 2,
87 [IF_SCSI] = 7,
88 };
89
90 /**
91 * Boards may call this to offer board-by-board overrides
92 * of the default, global values.
93 */
94 void override_max_devs(BlockInterfaceType type, int max_devs)
95 {
96 BlockBackend *blk;
97 DriveInfo *dinfo;
98
99 if (max_devs <= 0) {
100 return;
101 }
102
103 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
104 dinfo = blk_legacy_dinfo(blk);
105 if (dinfo->type == type) {
106 fprintf(stderr, "Cannot override units-per-bus property of"
107 " the %s interface, because a drive of that type has"
108 " already been added.\n", if_name[type]);
109 g_assert_not_reached();
110 }
111 }
112
113 if_max_devs[type] = max_devs;
114 }
115
116 /*
117 * We automatically delete the drive when a device using it gets
118 * unplugged. Questionable feature, but we can't just drop it.
119 * Device models call blockdev_mark_auto_del() to schedule the
120 * automatic deletion, and generic qdev code calls blockdev_auto_del()
121 * when deletion is actually safe.
122 */
123 void blockdev_mark_auto_del(BlockBackend *blk)
124 {
125 DriveInfo *dinfo = blk_legacy_dinfo(blk);
126 BlockDriverState *bs = blk_bs(blk);
127 AioContext *aio_context;
128
129 if (!dinfo) {
130 return;
131 }
132
133 if (bs) {
134 aio_context = bdrv_get_aio_context(bs);
135 aio_context_acquire(aio_context);
136
137 if (bs->job) {
138 block_job_cancel(bs->job);
139 }
140
141 aio_context_release(aio_context);
142 }
143
144 dinfo->auto_del = 1;
145 }
146
147 void blockdev_auto_del(BlockBackend *blk)
148 {
149 DriveInfo *dinfo = blk_legacy_dinfo(blk);
150
151 if (dinfo && dinfo->auto_del) {
152 monitor_remove_blk(blk);
153 blk_unref(blk);
154 }
155 }
156
157 /**
158 * Returns the current mapping of how many units per bus
159 * a particular interface can support.
160 *
161 * A positive integer indicates n units per bus.
162 * 0 implies the mapping has not been established.
163 * -1 indicates an invalid BlockInterfaceType was given.
164 */
165 int drive_get_max_devs(BlockInterfaceType type)
166 {
167 if (type >= IF_IDE && type < IF_COUNT) {
168 return if_max_devs[type];
169 }
170
171 return -1;
172 }
173
174 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
175 {
176 int max_devs = if_max_devs[type];
177 return max_devs ? index / max_devs : 0;
178 }
179
180 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
181 {
182 int max_devs = if_max_devs[type];
183 return max_devs ? index % max_devs : index;
184 }
185
186 QemuOpts *drive_def(const char *optstr)
187 {
188 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
189 }
190
191 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
192 const char *optstr)
193 {
194 QemuOpts *opts;
195
196 opts = drive_def(optstr);
197 if (!opts) {
198 return NULL;
199 }
200 if (type != IF_DEFAULT) {
201 qemu_opt_set(opts, "if", if_name[type], &error_abort);
202 }
203 if (index >= 0) {
204 qemu_opt_set_number(opts, "index", index, &error_abort);
205 }
206 if (file)
207 qemu_opt_set(opts, "file", file, &error_abort);
208 return opts;
209 }
210
211 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
212 {
213 BlockBackend *blk;
214 DriveInfo *dinfo;
215
216 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
217 dinfo = blk_legacy_dinfo(blk);
218 if (dinfo && dinfo->type == type
219 && dinfo->bus == bus && dinfo->unit == unit) {
220 return dinfo;
221 }
222 }
223
224 return NULL;
225 }
226
227 bool drive_check_orphaned(void)
228 {
229 BlockBackend *blk;
230 DriveInfo *dinfo;
231 bool rs = false;
232
233 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
234 dinfo = blk_legacy_dinfo(blk);
235 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
236 /* Unless this is a default drive, this may be an oversight. */
237 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
238 dinfo->type != IF_NONE) {
239 fprintf(stderr, "Warning: Orphaned drive without device: "
240 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
241 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
242 if_name[dinfo->type], dinfo->bus, dinfo->unit);
243 rs = true;
244 }
245 }
246
247 return rs;
248 }
249
250 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
251 {
252 return drive_get(type,
253 drive_index_to_bus_id(type, index),
254 drive_index_to_unit_id(type, index));
255 }
256
257 int drive_get_max_bus(BlockInterfaceType type)
258 {
259 int max_bus;
260 BlockBackend *blk;
261 DriveInfo *dinfo;
262
263 max_bus = -1;
264 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
265 dinfo = blk_legacy_dinfo(blk);
266 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
267 max_bus = dinfo->bus;
268 }
269 }
270 return max_bus;
271 }
272
273 /* Get a block device. This should only be used for single-drive devices
274 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
275 appropriate bus. */
276 DriveInfo *drive_get_next(BlockInterfaceType type)
277 {
278 static int next_block_unit[IF_COUNT];
279
280 return drive_get(type, 0, next_block_unit[type]++);
281 }
282
283 static void bdrv_format_print(void *opaque, const char *name)
284 {
285 error_printf(" %s", name);
286 }
287
288 typedef struct {
289 QEMUBH *bh;
290 BlockDriverState *bs;
291 } BDRVPutRefBH;
292
293 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
294 {
295 if (!strcmp(buf, "ignore")) {
296 return BLOCKDEV_ON_ERROR_IGNORE;
297 } else if (!is_read && !strcmp(buf, "enospc")) {
298 return BLOCKDEV_ON_ERROR_ENOSPC;
299 } else if (!strcmp(buf, "stop")) {
300 return BLOCKDEV_ON_ERROR_STOP;
301 } else if (!strcmp(buf, "report")) {
302 return BLOCKDEV_ON_ERROR_REPORT;
303 } else {
304 error_setg(errp, "'%s' invalid %s error action",
305 buf, is_read ? "read" : "write");
306 return -1;
307 }
308 }
309
310 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
311 Error **errp)
312 {
313 const QListEntry *entry;
314 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
315 switch (qobject_type(entry->value)) {
316
317 case QTYPE_QSTRING: {
318 unsigned long long length;
319 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
320 if (parse_uint_full(str, &length, 10) == 0 &&
321 length > 0 && length <= UINT_MAX) {
322 block_acct_add_interval(stats, (unsigned) length);
323 } else {
324 error_setg(errp, "Invalid interval length: %s", str);
325 return false;
326 }
327 break;
328 }
329
330 case QTYPE_QINT: {
331 int64_t length = qint_get_int(qobject_to_qint(entry->value));
332 if (length > 0 && length <= UINT_MAX) {
333 block_acct_add_interval(stats, (unsigned) length);
334 } else {
335 error_setg(errp, "Invalid interval length: %" PRId64, length);
336 return false;
337 }
338 break;
339 }
340
341 default:
342 error_setg(errp, "The specification of stats-intervals is invalid");
343 return false;
344 }
345 }
346 return true;
347 }
348
349 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
350
351 /* All parameters but @opts are optional and may be set to NULL. */
352 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
353 const char **throttling_group, ThrottleConfig *throttle_cfg,
354 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
355 {
356 const char *discard;
357 Error *local_error = NULL;
358 const char *aio;
359
360 if (bdrv_flags) {
361 if (!qemu_opt_get_bool(opts, "read-only", false)) {
362 *bdrv_flags |= BDRV_O_RDWR;
363 }
364 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
365 *bdrv_flags |= BDRV_O_COPY_ON_READ;
366 }
367
368 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
369 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
370 error_setg(errp, "Invalid discard option");
371 return;
372 }
373 }
374
375 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
376 if (!strcmp(aio, "native")) {
377 *bdrv_flags |= BDRV_O_NATIVE_AIO;
378 } else if (!strcmp(aio, "threads")) {
379 /* this is the default */
380 } else {
381 error_setg(errp, "invalid aio option");
382 return;
383 }
384 }
385 }
386
387 /* disk I/O throttling */
388 if (throttling_group) {
389 *throttling_group = qemu_opt_get(opts, "throttling.group");
390 }
391
392 if (throttle_cfg) {
393 throttle_config_init(throttle_cfg);
394 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
395 qemu_opt_get_number(opts, "throttling.bps-total", 0);
396 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
397 qemu_opt_get_number(opts, "throttling.bps-read", 0);
398 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
399 qemu_opt_get_number(opts, "throttling.bps-write", 0);
400 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
401 qemu_opt_get_number(opts, "throttling.iops-total", 0);
402 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
403 qemu_opt_get_number(opts, "throttling.iops-read", 0);
404 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
405 qemu_opt_get_number(opts, "throttling.iops-write", 0);
406
407 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
408 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
409 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
410 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
411 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
412 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
413 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
414 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
415 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
416 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
417 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
418 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
419
420 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
421 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
422 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
423 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
424 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
425 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
426 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
427 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
428 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
429 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
430 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
431 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
432
433 throttle_cfg->op_size =
434 qemu_opt_get_number(opts, "throttling.iops-size", 0);
435
436 if (!throttle_is_valid(throttle_cfg, errp)) {
437 return;
438 }
439 }
440
441 if (detect_zeroes) {
442 *detect_zeroes =
443 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
444 qemu_opt_get(opts, "detect-zeroes"),
445 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
446 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
447 &local_error);
448 if (local_error) {
449 error_propagate(errp, local_error);
450 return;
451 }
452
453 if (bdrv_flags &&
454 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
455 !(*bdrv_flags & BDRV_O_UNMAP))
456 {
457 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
458 "without setting discard operation to unmap");
459 return;
460 }
461 }
462 }
463
464 /* Takes the ownership of bs_opts */
465 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
466 Error **errp)
467 {
468 const char *buf;
469 int bdrv_flags = 0;
470 int on_read_error, on_write_error;
471 bool account_invalid, account_failed;
472 BlockBackend *blk;
473 BlockDriverState *bs;
474 ThrottleConfig cfg;
475 int snapshot = 0;
476 Error *error = NULL;
477 QemuOpts *opts;
478 QDict *interval_dict = NULL;
479 QList *interval_list = NULL;
480 const char *id;
481 BlockdevDetectZeroesOptions detect_zeroes =
482 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
483 const char *throttling_group = NULL;
484
485 /* Check common options by copying from bs_opts to opts, all other options
486 * stay in bs_opts for processing by bdrv_open(). */
487 id = qdict_get_try_str(bs_opts, "id");
488 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
489 if (error) {
490 error_propagate(errp, error);
491 goto err_no_opts;
492 }
493
494 qemu_opts_absorb_qdict(opts, bs_opts, &error);
495 if (error) {
496 error_propagate(errp, error);
497 goto early_err;
498 }
499
500 if (id) {
501 qdict_del(bs_opts, "id");
502 }
503
504 /* extract parameters */
505 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
506
507 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
508 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
509
510 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
511 qdict_array_split(interval_dict, &interval_list);
512
513 if (qdict_size(interval_dict) != 0) {
514 error_setg(errp, "Invalid option stats-intervals.%s",
515 qdict_first(interval_dict)->key);
516 goto early_err;
517 }
518
519 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
520 &detect_zeroes, &error);
521 if (error) {
522 error_propagate(errp, error);
523 goto early_err;
524 }
525
526 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
527 if (is_help_option(buf)) {
528 error_printf("Supported formats:");
529 bdrv_iterate_format(bdrv_format_print, NULL);
530 error_printf("\n");
531 goto early_err;
532 }
533
534 if (qdict_haskey(bs_opts, "driver")) {
535 error_setg(errp, "Cannot specify both 'driver' and 'format'");
536 goto early_err;
537 }
538 qdict_put(bs_opts, "driver", qstring_from_str(buf));
539 }
540
541 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
542 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
543 on_write_error = parse_block_error_action(buf, 0, &error);
544 if (error) {
545 error_propagate(errp, error);
546 goto early_err;
547 }
548 }
549
550 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
551 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
552 on_read_error = parse_block_error_action(buf, 1, &error);
553 if (error) {
554 error_propagate(errp, error);
555 goto early_err;
556 }
557 }
558
559 if (snapshot) {
560 bdrv_flags |= BDRV_O_SNAPSHOT;
561 }
562
563 /* init */
564 if ((!file || !*file) && !qdict_size(bs_opts)) {
565 BlockBackendRootState *blk_rs;
566
567 blk = blk_new(errp);
568 if (!blk) {
569 goto early_err;
570 }
571
572 blk_rs = blk_get_root_state(blk);
573 blk_rs->open_flags = bdrv_flags;
574 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
575 blk_rs->detect_zeroes = detect_zeroes;
576
577 if (throttle_enabled(&cfg)) {
578 if (!throttling_group) {
579 throttling_group = blk_name(blk);
580 }
581 blk_rs->throttle_group = g_strdup(throttling_group);
582 blk_rs->throttle_state = throttle_group_incref(throttling_group);
583 blk_rs->throttle_state->cfg = cfg;
584 }
585
586 QDECREF(bs_opts);
587 } else {
588 if (file && !*file) {
589 file = NULL;
590 }
591
592 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
593 * with other callers) rather than what we want as the real defaults.
594 * Apply the defaults here instead. */
595 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
596 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
597 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
598
599 if (runstate_check(RUN_STATE_INMIGRATE)) {
600 bdrv_flags |= BDRV_O_INACTIVE;
601 }
602
603 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
604 if (!blk) {
605 goto err_no_bs_opts;
606 }
607 bs = blk_bs(blk);
608
609 bs->detect_zeroes = detect_zeroes;
610
611 /* disk I/O throttling */
612 if (throttle_enabled(&cfg)) {
613 if (!throttling_group) {
614 throttling_group = blk_name(blk);
615 }
616 bdrv_io_limits_enable(bs, throttling_group);
617 bdrv_set_io_limits(bs, &cfg);
618 }
619
620 if (bdrv_key_required(bs)) {
621 autostart = 0;
622 }
623
624 block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
625
626 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
627 blk_unref(blk);
628 blk = NULL;
629 goto err_no_bs_opts;
630 }
631 }
632
633 blk_set_on_error(blk, on_read_error, on_write_error);
634
635 if (!monitor_add_blk(blk, qemu_opts_id(opts), errp)) {
636 blk_unref(blk);
637 blk = NULL;
638 goto err_no_bs_opts;
639 }
640
641 err_no_bs_opts:
642 qemu_opts_del(opts);
643 QDECREF(interval_dict);
644 QDECREF(interval_list);
645 return blk;
646
647 early_err:
648 qemu_opts_del(opts);
649 QDECREF(interval_dict);
650 QDECREF(interval_list);
651 err_no_opts:
652 QDECREF(bs_opts);
653 return NULL;
654 }
655
656 static QemuOptsList qemu_root_bds_opts;
657
658 /* Takes the ownership of bs_opts */
659 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
660 {
661 BlockDriverState *bs;
662 QemuOpts *opts;
663 Error *local_error = NULL;
664 BlockdevDetectZeroesOptions detect_zeroes;
665 int ret;
666 int bdrv_flags = 0;
667
668 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
669 if (!opts) {
670 goto fail;
671 }
672
673 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
674 if (local_error) {
675 error_propagate(errp, local_error);
676 goto fail;
677 }
678
679 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
680 &detect_zeroes, &local_error);
681 if (local_error) {
682 error_propagate(errp, local_error);
683 goto fail;
684 }
685
686 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
687 * with other callers) rather than what we want as the real defaults.
688 * Apply the defaults here instead. */
689 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
690 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
691 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
692
693 if (runstate_check(RUN_STATE_INMIGRATE)) {
694 bdrv_flags |= BDRV_O_INACTIVE;
695 }
696
697 bs = NULL;
698 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
699 if (ret < 0) {
700 goto fail_no_bs_opts;
701 }
702
703 bs->detect_zeroes = detect_zeroes;
704
705 fail_no_bs_opts:
706 qemu_opts_del(opts);
707 return bs;
708
709 fail:
710 qemu_opts_del(opts);
711 QDECREF(bs_opts);
712 return NULL;
713 }
714
715 void blockdev_close_all_bdrv_states(void)
716 {
717 BlockDriverState *bs, *next_bs;
718
719 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
720 AioContext *ctx = bdrv_get_aio_context(bs);
721
722 aio_context_acquire(ctx);
723 bdrv_unref(bs);
724 aio_context_release(ctx);
725 }
726 }
727
728 /* Iterates over the list of monitor-owned BlockDriverStates */
729 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
730 {
731 return bs ? QTAILQ_NEXT(bs, monitor_list)
732 : QTAILQ_FIRST(&monitor_bdrv_states);
733 }
734
735 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
736 Error **errp)
737 {
738 const char *value;
739
740 value = qemu_opt_get(opts, from);
741 if (value) {
742 if (qemu_opt_find(opts, to)) {
743 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
744 "same time", to, from);
745 return;
746 }
747 }
748
749 /* rename all items in opts */
750 while ((value = qemu_opt_get(opts, from))) {
751 qemu_opt_set(opts, to, value, &error_abort);
752 qemu_opt_unset(opts, from);
753 }
754 }
755
756 QemuOptsList qemu_legacy_drive_opts = {
757 .name = "drive",
758 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
759 .desc = {
760 {
761 .name = "bus",
762 .type = QEMU_OPT_NUMBER,
763 .help = "bus number",
764 },{
765 .name = "unit",
766 .type = QEMU_OPT_NUMBER,
767 .help = "unit number (i.e. lun for scsi)",
768 },{
769 .name = "index",
770 .type = QEMU_OPT_NUMBER,
771 .help = "index number",
772 },{
773 .name = "media",
774 .type = QEMU_OPT_STRING,
775 .help = "media type (disk, cdrom)",
776 },{
777 .name = "if",
778 .type = QEMU_OPT_STRING,
779 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
780 },{
781 .name = "cyls",
782 .type = QEMU_OPT_NUMBER,
783 .help = "number of cylinders (ide disk geometry)",
784 },{
785 .name = "heads",
786 .type = QEMU_OPT_NUMBER,
787 .help = "number of heads (ide disk geometry)",
788 },{
789 .name = "secs",
790 .type = QEMU_OPT_NUMBER,
791 .help = "number of sectors (ide disk geometry)",
792 },{
793 .name = "trans",
794 .type = QEMU_OPT_STRING,
795 .help = "chs translation (auto, lba, none)",
796 },{
797 .name = "boot",
798 .type = QEMU_OPT_BOOL,
799 .help = "(deprecated, ignored)",
800 },{
801 .name = "addr",
802 .type = QEMU_OPT_STRING,
803 .help = "pci address (virtio only)",
804 },{
805 .name = "serial",
806 .type = QEMU_OPT_STRING,
807 .help = "disk serial number",
808 },{
809 .name = "file",
810 .type = QEMU_OPT_STRING,
811 .help = "file name",
812 },
813
814 /* Options that are passed on, but have special semantics with -drive */
815 {
816 .name = "read-only",
817 .type = QEMU_OPT_BOOL,
818 .help = "open drive file as read-only",
819 },{
820 .name = "rerror",
821 .type = QEMU_OPT_STRING,
822 .help = "read error action",
823 },{
824 .name = "werror",
825 .type = QEMU_OPT_STRING,
826 .help = "write error action",
827 },{
828 .name = "copy-on-read",
829 .type = QEMU_OPT_BOOL,
830 .help = "copy read data from backing file into image file",
831 },
832
833 { /* end of list */ }
834 },
835 };
836
837 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
838 {
839 const char *value;
840 BlockBackend *blk;
841 DriveInfo *dinfo = NULL;
842 QDict *bs_opts;
843 QemuOpts *legacy_opts;
844 DriveMediaType media = MEDIA_DISK;
845 BlockInterfaceType type;
846 int cyls, heads, secs, translation;
847 int max_devs, bus_id, unit_id, index;
848 const char *devaddr;
849 const char *werror, *rerror;
850 bool read_only = false;
851 bool copy_on_read;
852 const char *serial;
853 const char *filename;
854 Error *local_err = NULL;
855 int i;
856
857 /* Change legacy command line options into QMP ones */
858 static const struct {
859 const char *from;
860 const char *to;
861 } opt_renames[] = {
862 { "iops", "throttling.iops-total" },
863 { "iops_rd", "throttling.iops-read" },
864 { "iops_wr", "throttling.iops-write" },
865
866 { "bps", "throttling.bps-total" },
867 { "bps_rd", "throttling.bps-read" },
868 { "bps_wr", "throttling.bps-write" },
869
870 { "iops_max", "throttling.iops-total-max" },
871 { "iops_rd_max", "throttling.iops-read-max" },
872 { "iops_wr_max", "throttling.iops-write-max" },
873
874 { "bps_max", "throttling.bps-total-max" },
875 { "bps_rd_max", "throttling.bps-read-max" },
876 { "bps_wr_max", "throttling.bps-write-max" },
877
878 { "iops_size", "throttling.iops-size" },
879
880 { "group", "throttling.group" },
881
882 { "readonly", "read-only" },
883 };
884
885 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
886 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
887 &local_err);
888 if (local_err) {
889 error_report_err(local_err);
890 return NULL;
891 }
892 }
893
894 value = qemu_opt_get(all_opts, "cache");
895 if (value) {
896 int flags = 0;
897
898 if (bdrv_parse_cache_flags(value, &flags) != 0) {
899 error_report("invalid cache option");
900 return NULL;
901 }
902
903 /* Specific options take precedence */
904 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
905 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
906 !!(flags & BDRV_O_CACHE_WB), &error_abort);
907 }
908 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
909 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
910 !!(flags & BDRV_O_NOCACHE), &error_abort);
911 }
912 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
913 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
914 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
915 }
916 qemu_opt_unset(all_opts, "cache");
917 }
918
919 /* Get a QDict for processing the options */
920 bs_opts = qdict_new();
921 qemu_opts_to_qdict(all_opts, bs_opts);
922
923 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
924 &error_abort);
925 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
926 if (local_err) {
927 error_report_err(local_err);
928 goto fail;
929 }
930
931 /* Deprecated option boot=[on|off] */
932 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
933 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
934 "ignored. Future versions will reject this parameter. Please "
935 "update your scripts.\n");
936 }
937
938 /* Media type */
939 value = qemu_opt_get(legacy_opts, "media");
940 if (value) {
941 if (!strcmp(value, "disk")) {
942 media = MEDIA_DISK;
943 } else if (!strcmp(value, "cdrom")) {
944 media = MEDIA_CDROM;
945 read_only = true;
946 } else {
947 error_report("'%s' invalid media", value);
948 goto fail;
949 }
950 }
951
952 /* copy-on-read is disabled with a warning for read-only devices */
953 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
954 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
955
956 if (read_only && copy_on_read) {
957 error_report("warning: disabling copy-on-read on read-only drive");
958 copy_on_read = false;
959 }
960
961 qdict_put(bs_opts, "read-only",
962 qstring_from_str(read_only ? "on" : "off"));
963 qdict_put(bs_opts, "copy-on-read",
964 qstring_from_str(copy_on_read ? "on" :"off"));
965
966 /* Controller type */
967 value = qemu_opt_get(legacy_opts, "if");
968 if (value) {
969 for (type = 0;
970 type < IF_COUNT && strcmp(value, if_name[type]);
971 type++) {
972 }
973 if (type == IF_COUNT) {
974 error_report("unsupported bus type '%s'", value);
975 goto fail;
976 }
977 } else {
978 type = block_default_type;
979 }
980
981 /* Geometry */
982 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
983 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
984 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
985
986 if (cyls || heads || secs) {
987 if (cyls < 1) {
988 error_report("invalid physical cyls number");
989 goto fail;
990 }
991 if (heads < 1) {
992 error_report("invalid physical heads number");
993 goto fail;
994 }
995 if (secs < 1) {
996 error_report("invalid physical secs number");
997 goto fail;
998 }
999 }
1000
1001 translation = BIOS_ATA_TRANSLATION_AUTO;
1002 value = qemu_opt_get(legacy_opts, "trans");
1003 if (value != NULL) {
1004 if (!cyls) {
1005 error_report("'%s' trans must be used with cyls, heads and secs",
1006 value);
1007 goto fail;
1008 }
1009 if (!strcmp(value, "none")) {
1010 translation = BIOS_ATA_TRANSLATION_NONE;
1011 } else if (!strcmp(value, "lba")) {
1012 translation = BIOS_ATA_TRANSLATION_LBA;
1013 } else if (!strcmp(value, "large")) {
1014 translation = BIOS_ATA_TRANSLATION_LARGE;
1015 } else if (!strcmp(value, "rechs")) {
1016 translation = BIOS_ATA_TRANSLATION_RECHS;
1017 } else if (!strcmp(value, "auto")) {
1018 translation = BIOS_ATA_TRANSLATION_AUTO;
1019 } else {
1020 error_report("'%s' invalid translation type", value);
1021 goto fail;
1022 }
1023 }
1024
1025 if (media == MEDIA_CDROM) {
1026 if (cyls || secs || heads) {
1027 error_report("CHS can't be set with media=cdrom");
1028 goto fail;
1029 }
1030 }
1031
1032 /* Device address specified by bus/unit or index.
1033 * If none was specified, try to find the first free one. */
1034 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
1035 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
1036 index = qemu_opt_get_number(legacy_opts, "index", -1);
1037
1038 max_devs = if_max_devs[type];
1039
1040 if (index != -1) {
1041 if (bus_id != 0 || unit_id != -1) {
1042 error_report("index cannot be used with bus and unit");
1043 goto fail;
1044 }
1045 bus_id = drive_index_to_bus_id(type, index);
1046 unit_id = drive_index_to_unit_id(type, index);
1047 }
1048
1049 if (unit_id == -1) {
1050 unit_id = 0;
1051 while (drive_get(type, bus_id, unit_id) != NULL) {
1052 unit_id++;
1053 if (max_devs && unit_id >= max_devs) {
1054 unit_id -= max_devs;
1055 bus_id++;
1056 }
1057 }
1058 }
1059
1060 if (max_devs && unit_id >= max_devs) {
1061 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1062 goto fail;
1063 }
1064
1065 if (drive_get(type, bus_id, unit_id) != NULL) {
1066 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1067 bus_id, unit_id, index);
1068 goto fail;
1069 }
1070
1071 /* Serial number */
1072 serial = qemu_opt_get(legacy_opts, "serial");
1073
1074 /* no id supplied -> create one */
1075 if (qemu_opts_id(all_opts) == NULL) {
1076 char *new_id;
1077 const char *mediastr = "";
1078 if (type == IF_IDE || type == IF_SCSI) {
1079 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1080 }
1081 if (max_devs) {
1082 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1083 mediastr, unit_id);
1084 } else {
1085 new_id = g_strdup_printf("%s%s%i", if_name[type],
1086 mediastr, unit_id);
1087 }
1088 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1089 g_free(new_id);
1090 }
1091
1092 /* Add virtio block device */
1093 devaddr = qemu_opt_get(legacy_opts, "addr");
1094 if (devaddr && type != IF_VIRTIO) {
1095 error_report("addr is not supported by this bus type");
1096 goto fail;
1097 }
1098
1099 if (type == IF_VIRTIO) {
1100 QemuOpts *devopts;
1101 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1102 &error_abort);
1103 if (arch_type == QEMU_ARCH_S390X) {
1104 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1105 } else {
1106 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1107 }
1108 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1109 &error_abort);
1110 if (devaddr) {
1111 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1112 }
1113 }
1114
1115 filename = qemu_opt_get(legacy_opts, "file");
1116
1117 /* Check werror/rerror compatibility with if=... */
1118 werror = qemu_opt_get(legacy_opts, "werror");
1119 if (werror != NULL) {
1120 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1121 type != IF_NONE) {
1122 error_report("werror is not supported by this bus type");
1123 goto fail;
1124 }
1125 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1126 }
1127
1128 rerror = qemu_opt_get(legacy_opts, "rerror");
1129 if (rerror != NULL) {
1130 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1131 type != IF_NONE) {
1132 error_report("rerror is not supported by this bus type");
1133 goto fail;
1134 }
1135 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1136 }
1137
1138 /* Actual block device init: Functionality shared with blockdev-add */
1139 blk = blockdev_init(filename, bs_opts, &local_err);
1140 bs_opts = NULL;
1141 if (!blk) {
1142 if (local_err) {
1143 error_report_err(local_err);
1144 }
1145 goto fail;
1146 } else {
1147 assert(!local_err);
1148 }
1149
1150 /* Create legacy DriveInfo */
1151 dinfo = g_malloc0(sizeof(*dinfo));
1152 dinfo->opts = all_opts;
1153
1154 dinfo->cyls = cyls;
1155 dinfo->heads = heads;
1156 dinfo->secs = secs;
1157 dinfo->trans = translation;
1158
1159 dinfo->type = type;
1160 dinfo->bus = bus_id;
1161 dinfo->unit = unit_id;
1162 dinfo->devaddr = devaddr;
1163 dinfo->serial = g_strdup(serial);
1164
1165 blk_set_legacy_dinfo(blk, dinfo);
1166
1167 switch(type) {
1168 case IF_IDE:
1169 case IF_SCSI:
1170 case IF_XEN:
1171 case IF_NONE:
1172 dinfo->media_cd = media == MEDIA_CDROM;
1173 break;
1174 default:
1175 break;
1176 }
1177
1178 fail:
1179 qemu_opts_del(legacy_opts);
1180 QDECREF(bs_opts);
1181 return dinfo;
1182 }
1183
1184 void hmp_commit(Monitor *mon, const QDict *qdict)
1185 {
1186 const char *device = qdict_get_str(qdict, "device");
1187 BlockBackend *blk;
1188 int ret;
1189
1190 if (!strcmp(device, "all")) {
1191 ret = blk_commit_all();
1192 } else {
1193 BlockDriverState *bs;
1194 AioContext *aio_context;
1195
1196 blk = blk_by_name(device);
1197 if (!blk) {
1198 monitor_printf(mon, "Device '%s' not found\n", device);
1199 return;
1200 }
1201 if (!blk_is_available(blk)) {
1202 monitor_printf(mon, "Device '%s' has no medium\n", device);
1203 return;
1204 }
1205
1206 bs = blk_bs(blk);
1207 aio_context = bdrv_get_aio_context(bs);
1208 aio_context_acquire(aio_context);
1209
1210 ret = bdrv_commit(bs);
1211
1212 aio_context_release(aio_context);
1213 }
1214 if (ret < 0) {
1215 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1216 strerror(-ret));
1217 }
1218 }
1219
1220 static void blockdev_do_action(TransactionAction *action, Error **errp)
1221 {
1222 TransactionActionList list;
1223
1224 list.value = action;
1225 list.next = NULL;
1226 qmp_transaction(&list, false, NULL, errp);
1227 }
1228
1229 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1230 bool has_node_name, const char *node_name,
1231 const char *snapshot_file,
1232 bool has_snapshot_node_name,
1233 const char *snapshot_node_name,
1234 bool has_format, const char *format,
1235 bool has_mode, NewImageMode mode, Error **errp)
1236 {
1237 BlockdevSnapshotSync snapshot = {
1238 .has_device = has_device,
1239 .device = (char *) device,
1240 .has_node_name = has_node_name,
1241 .node_name = (char *) node_name,
1242 .snapshot_file = (char *) snapshot_file,
1243 .has_snapshot_node_name = has_snapshot_node_name,
1244 .snapshot_node_name = (char *) snapshot_node_name,
1245 .has_format = has_format,
1246 .format = (char *) format,
1247 .has_mode = has_mode,
1248 .mode = mode,
1249 };
1250 TransactionAction action = {
1251 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1252 .u.blockdev_snapshot_sync.data = &snapshot,
1253 };
1254 blockdev_do_action(&action, errp);
1255 }
1256
1257 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1258 Error **errp)
1259 {
1260 BlockdevSnapshot snapshot_data = {
1261 .node = (char *) node,
1262 .overlay = (char *) overlay
1263 };
1264 TransactionAction action = {
1265 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1266 .u.blockdev_snapshot.data = &snapshot_data,
1267 };
1268 blockdev_do_action(&action, errp);
1269 }
1270
1271 void qmp_blockdev_snapshot_internal_sync(const char *device,
1272 const char *name,
1273 Error **errp)
1274 {
1275 BlockdevSnapshotInternal snapshot = {
1276 .device = (char *) device,
1277 .name = (char *) name
1278 };
1279 TransactionAction action = {
1280 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1281 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1282 };
1283 blockdev_do_action(&action, errp);
1284 }
1285
1286 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1287 bool has_id,
1288 const char *id,
1289 bool has_name,
1290 const char *name,
1291 Error **errp)
1292 {
1293 BlockDriverState *bs;
1294 BlockBackend *blk;
1295 AioContext *aio_context;
1296 QEMUSnapshotInfo sn;
1297 Error *local_err = NULL;
1298 SnapshotInfo *info = NULL;
1299 int ret;
1300
1301 blk = blk_by_name(device);
1302 if (!blk) {
1303 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1304 "Device '%s' not found", device);
1305 return NULL;
1306 }
1307
1308 aio_context = blk_get_aio_context(blk);
1309 aio_context_acquire(aio_context);
1310
1311 if (!has_id) {
1312 id = NULL;
1313 }
1314
1315 if (!has_name) {
1316 name = NULL;
1317 }
1318
1319 if (!id && !name) {
1320 error_setg(errp, "Name or id must be provided");
1321 goto out_aio_context;
1322 }
1323
1324 if (!blk_is_available(blk)) {
1325 error_setg(errp, "Device '%s' has no medium", device);
1326 goto out_aio_context;
1327 }
1328 bs = blk_bs(blk);
1329
1330 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1331 goto out_aio_context;
1332 }
1333
1334 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1335 if (local_err) {
1336 error_propagate(errp, local_err);
1337 goto out_aio_context;
1338 }
1339 if (!ret) {
1340 error_setg(errp,
1341 "Snapshot with id '%s' and name '%s' does not exist on "
1342 "device '%s'",
1343 STR_OR_NULL(id), STR_OR_NULL(name), device);
1344 goto out_aio_context;
1345 }
1346
1347 bdrv_snapshot_delete(bs, id, name, &local_err);
1348 if (local_err) {
1349 error_propagate(errp, local_err);
1350 goto out_aio_context;
1351 }
1352
1353 aio_context_release(aio_context);
1354
1355 info = g_new0(SnapshotInfo, 1);
1356 info->id = g_strdup(sn.id_str);
1357 info->name = g_strdup(sn.name);
1358 info->date_nsec = sn.date_nsec;
1359 info->date_sec = sn.date_sec;
1360 info->vm_state_size = sn.vm_state_size;
1361 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1362 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1363
1364 return info;
1365
1366 out_aio_context:
1367 aio_context_release(aio_context);
1368 return NULL;
1369 }
1370
1371 /**
1372 * block_dirty_bitmap_lookup:
1373 * Return a dirty bitmap (if present), after validating
1374 * the node reference and bitmap names.
1375 *
1376 * @node: The name of the BDS node to search for bitmaps
1377 * @name: The name of the bitmap to search for
1378 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1379 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1380 * @errp: Output pointer for error information. Can be NULL.
1381 *
1382 * @return: A bitmap object on success, or NULL on failure.
1383 */
1384 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1385 const char *name,
1386 BlockDriverState **pbs,
1387 AioContext **paio,
1388 Error **errp)
1389 {
1390 BlockDriverState *bs;
1391 BdrvDirtyBitmap *bitmap;
1392 AioContext *aio_context;
1393
1394 if (!node) {
1395 error_setg(errp, "Node cannot be NULL");
1396 return NULL;
1397 }
1398 if (!name) {
1399 error_setg(errp, "Bitmap name cannot be NULL");
1400 return NULL;
1401 }
1402 bs = bdrv_lookup_bs(node, node, NULL);
1403 if (!bs) {
1404 error_setg(errp, "Node '%s' not found", node);
1405 return NULL;
1406 }
1407
1408 aio_context = bdrv_get_aio_context(bs);
1409 aio_context_acquire(aio_context);
1410
1411 bitmap = bdrv_find_dirty_bitmap(bs, name);
1412 if (!bitmap) {
1413 error_setg(errp, "Dirty bitmap '%s' not found", name);
1414 goto fail;
1415 }
1416
1417 if (pbs) {
1418 *pbs = bs;
1419 }
1420 if (paio) {
1421 *paio = aio_context;
1422 } else {
1423 aio_context_release(aio_context);
1424 }
1425
1426 return bitmap;
1427
1428 fail:
1429 aio_context_release(aio_context);
1430 return NULL;
1431 }
1432
1433 /* New and old BlockDriverState structs for atomic group operations */
1434
1435 typedef struct BlkActionState BlkActionState;
1436
1437 /**
1438 * BlkActionOps:
1439 * Table of operations that define an Action.
1440 *
1441 * @instance_size: Size of state struct, in bytes.
1442 * @prepare: Prepare the work, must NOT be NULL.
1443 * @commit: Commit the changes, can be NULL.
1444 * @abort: Abort the changes on fail, can be NULL.
1445 * @clean: Clean up resources after all transaction actions have called
1446 * commit() or abort(). Can be NULL.
1447 *
1448 * Only prepare() may fail. In a single transaction, only one of commit() or
1449 * abort() will be called. clean() will always be called if it is present.
1450 */
1451 typedef struct BlkActionOps {
1452 size_t instance_size;
1453 void (*prepare)(BlkActionState *common, Error **errp);
1454 void (*commit)(BlkActionState *common);
1455 void (*abort)(BlkActionState *common);
1456 void (*clean)(BlkActionState *common);
1457 } BlkActionOps;
1458
1459 /**
1460 * BlkActionState:
1461 * Describes one Action's state within a Transaction.
1462 *
1463 * @action: QAPI-defined enum identifying which Action to perform.
1464 * @ops: Table of ActionOps this Action can perform.
1465 * @block_job_txn: Transaction which this action belongs to.
1466 * @entry: List membership for all Actions in this Transaction.
1467 *
1468 * This structure must be arranged as first member in a subclassed type,
1469 * assuming that the compiler will also arrange it to the same offsets as the
1470 * base class.
1471 */
1472 struct BlkActionState {
1473 TransactionAction *action;
1474 const BlkActionOps *ops;
1475 BlockJobTxn *block_job_txn;
1476 TransactionProperties *txn_props;
1477 QSIMPLEQ_ENTRY(BlkActionState) entry;
1478 };
1479
1480 /* internal snapshot private data */
1481 typedef struct InternalSnapshotState {
1482 BlkActionState common;
1483 BlockDriverState *bs;
1484 AioContext *aio_context;
1485 QEMUSnapshotInfo sn;
1486 bool created;
1487 } InternalSnapshotState;
1488
1489
1490 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1491 {
1492 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1493 error_setg(errp,
1494 "Action '%s' does not support Transaction property "
1495 "completion-mode = %s",
1496 TransactionActionKind_lookup[s->action->type],
1497 ActionCompletionMode_lookup[s->txn_props->completion_mode]);
1498 return -1;
1499 }
1500 return 0;
1501 }
1502
1503 static void internal_snapshot_prepare(BlkActionState *common,
1504 Error **errp)
1505 {
1506 Error *local_err = NULL;
1507 const char *device;
1508 const char *name;
1509 BlockBackend *blk;
1510 BlockDriverState *bs;
1511 QEMUSnapshotInfo old_sn, *sn;
1512 bool ret;
1513 qemu_timeval tv;
1514 BlockdevSnapshotInternal *internal;
1515 InternalSnapshotState *state;
1516 int ret1;
1517
1518 g_assert(common->action->type ==
1519 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1520 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1521 state = DO_UPCAST(InternalSnapshotState, common, common);
1522
1523 /* 1. parse input */
1524 device = internal->device;
1525 name = internal->name;
1526
1527 /* 2. check for validation */
1528 if (action_check_completion_mode(common, errp) < 0) {
1529 return;
1530 }
1531
1532 blk = blk_by_name(device);
1533 if (!blk) {
1534 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1535 "Device '%s' not found", device);
1536 return;
1537 }
1538
1539 /* AioContext is released in .clean() */
1540 state->aio_context = blk_get_aio_context(blk);
1541 aio_context_acquire(state->aio_context);
1542
1543 if (!blk_is_available(blk)) {
1544 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1545 return;
1546 }
1547 bs = blk_bs(blk);
1548
1549 state->bs = bs;
1550 bdrv_drained_begin(bs);
1551
1552 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1553 return;
1554 }
1555
1556 if (bdrv_is_read_only(bs)) {
1557 error_setg(errp, "Device '%s' is read only", device);
1558 return;
1559 }
1560
1561 if (!bdrv_can_snapshot(bs)) {
1562 error_setg(errp, "Block format '%s' used by device '%s' "
1563 "does not support internal snapshots",
1564 bs->drv->format_name, device);
1565 return;
1566 }
1567
1568 if (!strlen(name)) {
1569 error_setg(errp, "Name is empty");
1570 return;
1571 }
1572
1573 /* check whether a snapshot with name exist */
1574 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1575 &local_err);
1576 if (local_err) {
1577 error_propagate(errp, local_err);
1578 return;
1579 } else if (ret) {
1580 error_setg(errp,
1581 "Snapshot with name '%s' already exists on device '%s'",
1582 name, device);
1583 return;
1584 }
1585
1586 /* 3. take the snapshot */
1587 sn = &state->sn;
1588 pstrcpy(sn->name, sizeof(sn->name), name);
1589 qemu_gettimeofday(&tv);
1590 sn->date_sec = tv.tv_sec;
1591 sn->date_nsec = tv.tv_usec * 1000;
1592 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1593
1594 ret1 = bdrv_snapshot_create(bs, sn);
1595 if (ret1 < 0) {
1596 error_setg_errno(errp, -ret1,
1597 "Failed to create snapshot '%s' on device '%s'",
1598 name, device);
1599 return;
1600 }
1601
1602 /* 4. succeed, mark a snapshot is created */
1603 state->created = true;
1604 }
1605
1606 static void internal_snapshot_abort(BlkActionState *common)
1607 {
1608 InternalSnapshotState *state =
1609 DO_UPCAST(InternalSnapshotState, common, common);
1610 BlockDriverState *bs = state->bs;
1611 QEMUSnapshotInfo *sn = &state->sn;
1612 Error *local_error = NULL;
1613
1614 if (!state->created) {
1615 return;
1616 }
1617
1618 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1619 error_reportf_err(local_error,
1620 "Failed to delete snapshot with id '%s' and "
1621 "name '%s' on device '%s' in abort: ",
1622 sn->id_str, sn->name,
1623 bdrv_get_device_name(bs));
1624 }
1625 }
1626
1627 static void internal_snapshot_clean(BlkActionState *common)
1628 {
1629 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1630 common, common);
1631
1632 if (state->aio_context) {
1633 if (state->bs) {
1634 bdrv_drained_end(state->bs);
1635 }
1636 aio_context_release(state->aio_context);
1637 }
1638 }
1639
1640 /* external snapshot private data */
1641 typedef struct ExternalSnapshotState {
1642 BlkActionState common;
1643 BlockDriverState *old_bs;
1644 BlockDriverState *new_bs;
1645 AioContext *aio_context;
1646 } ExternalSnapshotState;
1647
1648 static void external_snapshot_prepare(BlkActionState *common,
1649 Error **errp)
1650 {
1651 int flags = 0, ret;
1652 QDict *options = NULL;
1653 Error *local_err = NULL;
1654 /* Device and node name of the image to generate the snapshot from */
1655 const char *device;
1656 const char *node_name;
1657 /* Reference to the new image (for 'blockdev-snapshot') */
1658 const char *snapshot_ref;
1659 /* File name of the new image (for 'blockdev-snapshot-sync') */
1660 const char *new_image_file;
1661 ExternalSnapshotState *state =
1662 DO_UPCAST(ExternalSnapshotState, common, common);
1663 TransactionAction *action = common->action;
1664
1665 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1666 * purpose but a different set of parameters */
1667 switch (action->type) {
1668 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1669 {
1670 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1671 device = s->node;
1672 node_name = s->node;
1673 new_image_file = NULL;
1674 snapshot_ref = s->overlay;
1675 }
1676 break;
1677 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1678 {
1679 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1680 device = s->has_device ? s->device : NULL;
1681 node_name = s->has_node_name ? s->node_name : NULL;
1682 new_image_file = s->snapshot_file;
1683 snapshot_ref = NULL;
1684 }
1685 break;
1686 default:
1687 g_assert_not_reached();
1688 }
1689
1690 /* start processing */
1691 if (action_check_completion_mode(common, errp) < 0) {
1692 return;
1693 }
1694
1695 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1696 if (!state->old_bs) {
1697 return;
1698 }
1699
1700 /* Acquire AioContext now so any threads operating on old_bs stop */
1701 state->aio_context = bdrv_get_aio_context(state->old_bs);
1702 aio_context_acquire(state->aio_context);
1703 bdrv_drained_begin(state->old_bs);
1704
1705 if (!bdrv_is_inserted(state->old_bs)) {
1706 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1707 return;
1708 }
1709
1710 if (bdrv_op_is_blocked(state->old_bs,
1711 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1712 return;
1713 }
1714
1715 if (!bdrv_is_read_only(state->old_bs)) {
1716 if (bdrv_flush(state->old_bs)) {
1717 error_setg(errp, QERR_IO_ERROR);
1718 return;
1719 }
1720 }
1721
1722 if (!bdrv_is_first_non_filter(state->old_bs)) {
1723 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1724 return;
1725 }
1726
1727 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1728 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1729 const char *format = s->has_format ? s->format : "qcow2";
1730 enum NewImageMode mode;
1731 const char *snapshot_node_name =
1732 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1733
1734 if (node_name && !snapshot_node_name) {
1735 error_setg(errp, "New snapshot node name missing");
1736 return;
1737 }
1738
1739 if (snapshot_node_name &&
1740 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1741 error_setg(errp, "New snapshot node name already in use");
1742 return;
1743 }
1744
1745 flags = state->old_bs->open_flags;
1746 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ);
1747
1748 /* create new image w/backing file */
1749 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1750 if (mode != NEW_IMAGE_MODE_EXISTING) {
1751 int64_t size = bdrv_getlength(state->old_bs);
1752 if (size < 0) {
1753 error_setg_errno(errp, -size, "bdrv_getlength failed");
1754 return;
1755 }
1756 bdrv_img_create(new_image_file, format,
1757 state->old_bs->filename,
1758 state->old_bs->drv->format_name,
1759 NULL, size, flags, &local_err, false);
1760 if (local_err) {
1761 error_propagate(errp, local_err);
1762 return;
1763 }
1764 }
1765
1766 options = qdict_new();
1767 if (s->has_snapshot_node_name) {
1768 qdict_put(options, "node-name",
1769 qstring_from_str(snapshot_node_name));
1770 }
1771 qdict_put(options, "driver", qstring_from_str(format));
1772
1773 flags |= BDRV_O_NO_BACKING;
1774 }
1775
1776 /* There is no BB attached during bdrv_open(), so we can't set a
1777 * writethrough mode. bdrv_append() will swap the WCE setting so that the
1778 * backing file becomes unconditionally writeback (which is what backing
1779 * files should always be) and the new overlay gets the original setting. */
1780 flags |= BDRV_O_CACHE_WB;
1781
1782 assert(state->new_bs == NULL);
1783 ret = bdrv_open(&state->new_bs, new_image_file, snapshot_ref, options,
1784 flags, errp);
1785 /* We will manually add the backing_hd field to the bs later */
1786 if (ret != 0) {
1787 return;
1788 }
1789
1790 if (state->new_bs->blk != NULL) {
1791 error_setg(errp, "The snapshot is already in use by %s",
1792 blk_name(state->new_bs->blk));
1793 return;
1794 }
1795
1796 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1797 errp)) {
1798 return;
1799 }
1800
1801 if (state->new_bs->backing != NULL) {
1802 error_setg(errp, "The snapshot already has a backing image");
1803 return;
1804 }
1805
1806 if (!state->new_bs->drv->supports_backing) {
1807 error_setg(errp, "The snapshot does not support backing images");
1808 }
1809 }
1810
1811 static void external_snapshot_commit(BlkActionState *common)
1812 {
1813 ExternalSnapshotState *state =
1814 DO_UPCAST(ExternalSnapshotState, common, common);
1815
1816 bdrv_set_aio_context(state->new_bs, state->aio_context);
1817
1818 /* This removes our old bs and adds the new bs */
1819 bdrv_append(state->new_bs, state->old_bs);
1820 /* We don't need (or want) to use the transactional
1821 * bdrv_reopen_multiple() across all the entries at once, because we
1822 * don't want to abort all of them if one of them fails the reopen */
1823 if (!state->old_bs->copy_on_read) {
1824 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1825 NULL);
1826 }
1827 }
1828
1829 static void external_snapshot_abort(BlkActionState *common)
1830 {
1831 ExternalSnapshotState *state =
1832 DO_UPCAST(ExternalSnapshotState, common, common);
1833 if (state->new_bs) {
1834 bdrv_unref(state->new_bs);
1835 }
1836 }
1837
1838 static void external_snapshot_clean(BlkActionState *common)
1839 {
1840 ExternalSnapshotState *state =
1841 DO_UPCAST(ExternalSnapshotState, common, common);
1842 if (state->aio_context) {
1843 bdrv_drained_end(state->old_bs);
1844 aio_context_release(state->aio_context);
1845 }
1846 }
1847
1848 typedef struct DriveBackupState {
1849 BlkActionState common;
1850 BlockDriverState *bs;
1851 AioContext *aio_context;
1852 BlockJob *job;
1853 } DriveBackupState;
1854
1855 static void do_drive_backup(const char *device, const char *target,
1856 bool has_format, const char *format,
1857 enum MirrorSyncMode sync,
1858 bool has_mode, enum NewImageMode mode,
1859 bool has_speed, int64_t speed,
1860 bool has_bitmap, const char *bitmap,
1861 bool has_on_source_error,
1862 BlockdevOnError on_source_error,
1863 bool has_on_target_error,
1864 BlockdevOnError on_target_error,
1865 BlockJobTxn *txn, Error **errp);
1866
1867 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1868 {
1869 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1870 BlockBackend *blk;
1871 DriveBackup *backup;
1872 Error *local_err = NULL;
1873
1874 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1875 backup = common->action->u.drive_backup.data;
1876
1877 blk = blk_by_name(backup->device);
1878 if (!blk) {
1879 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1880 "Device '%s' not found", backup->device);
1881 return;
1882 }
1883
1884 if (!blk_is_available(blk)) {
1885 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1886 return;
1887 }
1888
1889 /* AioContext is released in .clean() */
1890 state->aio_context = blk_get_aio_context(blk);
1891 aio_context_acquire(state->aio_context);
1892 bdrv_drained_begin(blk_bs(blk));
1893 state->bs = blk_bs(blk);
1894
1895 do_drive_backup(backup->device, backup->target,
1896 backup->has_format, backup->format,
1897 backup->sync,
1898 backup->has_mode, backup->mode,
1899 backup->has_speed, backup->speed,
1900 backup->has_bitmap, backup->bitmap,
1901 backup->has_on_source_error, backup->on_source_error,
1902 backup->has_on_target_error, backup->on_target_error,
1903 common->block_job_txn, &local_err);
1904 if (local_err) {
1905 error_propagate(errp, local_err);
1906 return;
1907 }
1908
1909 state->job = state->bs->job;
1910 }
1911
1912 static void drive_backup_abort(BlkActionState *common)
1913 {
1914 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1915 BlockDriverState *bs = state->bs;
1916
1917 /* Only cancel if it's the job we started */
1918 if (bs && bs->job && bs->job == state->job) {
1919 block_job_cancel_sync(bs->job);
1920 }
1921 }
1922
1923 static void drive_backup_clean(BlkActionState *common)
1924 {
1925 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1926
1927 if (state->aio_context) {
1928 bdrv_drained_end(state->bs);
1929 aio_context_release(state->aio_context);
1930 }
1931 }
1932
1933 typedef struct BlockdevBackupState {
1934 BlkActionState common;
1935 BlockDriverState *bs;
1936 BlockJob *job;
1937 AioContext *aio_context;
1938 } BlockdevBackupState;
1939
1940 static void do_blockdev_backup(const char *device, const char *target,
1941 enum MirrorSyncMode sync,
1942 bool has_speed, int64_t speed,
1943 bool has_on_source_error,
1944 BlockdevOnError on_source_error,
1945 bool has_on_target_error,
1946 BlockdevOnError on_target_error,
1947 BlockJobTxn *txn, Error **errp);
1948
1949 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1950 {
1951 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1952 BlockdevBackup *backup;
1953 BlockBackend *blk, *target;
1954 Error *local_err = NULL;
1955
1956 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1957 backup = common->action->u.blockdev_backup.data;
1958
1959 blk = blk_by_name(backup->device);
1960 if (!blk) {
1961 error_setg(errp, "Device '%s' not found", backup->device);
1962 return;
1963 }
1964
1965 if (!blk_is_available(blk)) {
1966 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1967 return;
1968 }
1969
1970 target = blk_by_name(backup->target);
1971 if (!target) {
1972 error_setg(errp, "Device '%s' not found", backup->target);
1973 return;
1974 }
1975
1976 /* AioContext is released in .clean() */
1977 state->aio_context = blk_get_aio_context(blk);
1978 if (state->aio_context != blk_get_aio_context(target)) {
1979 state->aio_context = NULL;
1980 error_setg(errp, "Backup between two IO threads is not implemented");
1981 return;
1982 }
1983 aio_context_acquire(state->aio_context);
1984 state->bs = blk_bs(blk);
1985 bdrv_drained_begin(state->bs);
1986
1987 do_blockdev_backup(backup->device, backup->target,
1988 backup->sync,
1989 backup->has_speed, backup->speed,
1990 backup->has_on_source_error, backup->on_source_error,
1991 backup->has_on_target_error, backup->on_target_error,
1992 common->block_job_txn, &local_err);
1993 if (local_err) {
1994 error_propagate(errp, local_err);
1995 return;
1996 }
1997
1998 state->job = state->bs->job;
1999 }
2000
2001 static void blockdev_backup_abort(BlkActionState *common)
2002 {
2003 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2004 BlockDriverState *bs = state->bs;
2005
2006 /* Only cancel if it's the job we started */
2007 if (bs && bs->job && bs->job == state->job) {
2008 block_job_cancel_sync(bs->job);
2009 }
2010 }
2011
2012 static void blockdev_backup_clean(BlkActionState *common)
2013 {
2014 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2015
2016 if (state->aio_context) {
2017 bdrv_drained_end(state->bs);
2018 aio_context_release(state->aio_context);
2019 }
2020 }
2021
2022 typedef struct BlockDirtyBitmapState {
2023 BlkActionState common;
2024 BdrvDirtyBitmap *bitmap;
2025 BlockDriverState *bs;
2026 AioContext *aio_context;
2027 HBitmap *backup;
2028 bool prepared;
2029 } BlockDirtyBitmapState;
2030
2031 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2032 Error **errp)
2033 {
2034 Error *local_err = NULL;
2035 BlockDirtyBitmapAdd *action;
2036 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2037 common, common);
2038
2039 if (action_check_completion_mode(common, errp) < 0) {
2040 return;
2041 }
2042
2043 action = common->action->u.block_dirty_bitmap_add.data;
2044 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2045 qmp_block_dirty_bitmap_add(action->node, action->name,
2046 action->has_granularity, action->granularity,
2047 &local_err);
2048
2049 if (!local_err) {
2050 state->prepared = true;
2051 } else {
2052 error_propagate(errp, local_err);
2053 }
2054 }
2055
2056 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2057 {
2058 BlockDirtyBitmapAdd *action;
2059 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2060 common, common);
2061
2062 action = common->action->u.block_dirty_bitmap_add.data;
2063 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2064 * then the node reference and bitmap name must have been valid.
2065 */
2066 if (state->prepared) {
2067 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2068 }
2069 }
2070
2071 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2072 Error **errp)
2073 {
2074 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2075 common, common);
2076 BlockDirtyBitmap *action;
2077
2078 if (action_check_completion_mode(common, errp) < 0) {
2079 return;
2080 }
2081
2082 action = common->action->u.block_dirty_bitmap_clear.data;
2083 state->bitmap = block_dirty_bitmap_lookup(action->node,
2084 action->name,
2085 &state->bs,
2086 &state->aio_context,
2087 errp);
2088 if (!state->bitmap) {
2089 return;
2090 }
2091
2092 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2093 error_setg(errp, "Cannot modify a frozen bitmap");
2094 return;
2095 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2096 error_setg(errp, "Cannot clear a disabled bitmap");
2097 return;
2098 }
2099
2100 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2101 /* AioContext is released in .clean() */
2102 }
2103
2104 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2105 {
2106 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2107 common, common);
2108
2109 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2110 }
2111
2112 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2113 {
2114 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2115 common, common);
2116
2117 hbitmap_free(state->backup);
2118 }
2119
2120 static void block_dirty_bitmap_clear_clean(BlkActionState *common)
2121 {
2122 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2123 common, common);
2124
2125 if (state->aio_context) {
2126 aio_context_release(state->aio_context);
2127 }
2128 }
2129
2130 static void abort_prepare(BlkActionState *common, Error **errp)
2131 {
2132 error_setg(errp, "Transaction aborted using Abort action");
2133 }
2134
2135 static void abort_commit(BlkActionState *common)
2136 {
2137 g_assert_not_reached(); /* this action never succeeds */
2138 }
2139
2140 static const BlkActionOps actions[] = {
2141 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2142 .instance_size = sizeof(ExternalSnapshotState),
2143 .prepare = external_snapshot_prepare,
2144 .commit = external_snapshot_commit,
2145 .abort = external_snapshot_abort,
2146 .clean = external_snapshot_clean,
2147 },
2148 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2149 .instance_size = sizeof(ExternalSnapshotState),
2150 .prepare = external_snapshot_prepare,
2151 .commit = external_snapshot_commit,
2152 .abort = external_snapshot_abort,
2153 .clean = external_snapshot_clean,
2154 },
2155 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2156 .instance_size = sizeof(DriveBackupState),
2157 .prepare = drive_backup_prepare,
2158 .abort = drive_backup_abort,
2159 .clean = drive_backup_clean,
2160 },
2161 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2162 .instance_size = sizeof(BlockdevBackupState),
2163 .prepare = blockdev_backup_prepare,
2164 .abort = blockdev_backup_abort,
2165 .clean = blockdev_backup_clean,
2166 },
2167 [TRANSACTION_ACTION_KIND_ABORT] = {
2168 .instance_size = sizeof(BlkActionState),
2169 .prepare = abort_prepare,
2170 .commit = abort_commit,
2171 },
2172 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2173 .instance_size = sizeof(InternalSnapshotState),
2174 .prepare = internal_snapshot_prepare,
2175 .abort = internal_snapshot_abort,
2176 .clean = internal_snapshot_clean,
2177 },
2178 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2179 .instance_size = sizeof(BlockDirtyBitmapState),
2180 .prepare = block_dirty_bitmap_add_prepare,
2181 .abort = block_dirty_bitmap_add_abort,
2182 },
2183 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2184 .instance_size = sizeof(BlockDirtyBitmapState),
2185 .prepare = block_dirty_bitmap_clear_prepare,
2186 .commit = block_dirty_bitmap_clear_commit,
2187 .abort = block_dirty_bitmap_clear_abort,
2188 .clean = block_dirty_bitmap_clear_clean,
2189 }
2190 };
2191
2192 /**
2193 * Allocate a TransactionProperties structure if necessary, and fill
2194 * that structure with desired defaults if they are unset.
2195 */
2196 static TransactionProperties *get_transaction_properties(
2197 TransactionProperties *props)
2198 {
2199 if (!props) {
2200 props = g_new0(TransactionProperties, 1);
2201 }
2202
2203 if (!props->has_completion_mode) {
2204 props->has_completion_mode = true;
2205 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2206 }
2207
2208 return props;
2209 }
2210
2211 /*
2212 * 'Atomic' group operations. The operations are performed as a set, and if
2213 * any fail then we roll back all operations in the group.
2214 */
2215 void qmp_transaction(TransactionActionList *dev_list,
2216 bool has_props,
2217 struct TransactionProperties *props,
2218 Error **errp)
2219 {
2220 TransactionActionList *dev_entry = dev_list;
2221 BlockJobTxn *block_job_txn = NULL;
2222 BlkActionState *state, *next;
2223 Error *local_err = NULL;
2224
2225 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2226 QSIMPLEQ_INIT(&snap_bdrv_states);
2227
2228 /* Does this transaction get canceled as a group on failure?
2229 * If not, we don't really need to make a BlockJobTxn.
2230 */
2231 props = get_transaction_properties(props);
2232 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2233 block_job_txn = block_job_txn_new();
2234 }
2235
2236 /* drain all i/o before any operations */
2237 bdrv_drain_all();
2238
2239 /* We don't do anything in this loop that commits us to the operations */
2240 while (NULL != dev_entry) {
2241 TransactionAction *dev_info = NULL;
2242 const BlkActionOps *ops;
2243
2244 dev_info = dev_entry->value;
2245 dev_entry = dev_entry->next;
2246
2247 assert(dev_info->type < ARRAY_SIZE(actions));
2248
2249 ops = &actions[dev_info->type];
2250 assert(ops->instance_size > 0);
2251
2252 state = g_malloc0(ops->instance_size);
2253 state->ops = ops;
2254 state->action = dev_info;
2255 state->block_job_txn = block_job_txn;
2256 state->txn_props = props;
2257 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2258
2259 state->ops->prepare(state, &local_err);
2260 if (local_err) {
2261 error_propagate(errp, local_err);
2262 goto delete_and_fail;
2263 }
2264 }
2265
2266 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2267 if (state->ops->commit) {
2268 state->ops->commit(state);
2269 }
2270 }
2271
2272 /* success */
2273 goto exit;
2274
2275 delete_and_fail:
2276 /* failure, and it is all-or-none; roll back all operations */
2277 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2278 if (state->ops->abort) {
2279 state->ops->abort(state);
2280 }
2281 }
2282 exit:
2283 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2284 if (state->ops->clean) {
2285 state->ops->clean(state);
2286 }
2287 g_free(state);
2288 }
2289 if (!has_props) {
2290 qapi_free_TransactionProperties(props);
2291 }
2292 block_job_txn_unref(block_job_txn);
2293 }
2294
2295 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
2296 {
2297 Error *local_err = NULL;
2298
2299 qmp_blockdev_open_tray(device, has_force, force, &local_err);
2300 if (local_err) {
2301 error_propagate(errp, local_err);
2302 return;
2303 }
2304
2305 qmp_x_blockdev_remove_medium(device, errp);
2306 }
2307
2308 void qmp_block_passwd(bool has_device, const char *device,
2309 bool has_node_name, const char *node_name,
2310 const char *password, Error **errp)
2311 {
2312 Error *local_err = NULL;
2313 BlockDriverState *bs;
2314 AioContext *aio_context;
2315
2316 bs = bdrv_lookup_bs(has_device ? device : NULL,
2317 has_node_name ? node_name : NULL,
2318 &local_err);
2319 if (local_err) {
2320 error_propagate(errp, local_err);
2321 return;
2322 }
2323
2324 aio_context = bdrv_get_aio_context(bs);
2325 aio_context_acquire(aio_context);
2326
2327 bdrv_add_key(bs, password, errp);
2328
2329 aio_context_release(aio_context);
2330 }
2331
2332 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force,
2333 Error **errp)
2334 {
2335 BlockBackend *blk;
2336 bool locked;
2337
2338 if (!has_force) {
2339 force = false;
2340 }
2341
2342 blk = blk_by_name(device);
2343 if (!blk) {
2344 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2345 "Device '%s' not found", device);
2346 return;
2347 }
2348
2349 if (!blk_dev_has_removable_media(blk)) {
2350 error_setg(errp, "Device '%s' is not removable", device);
2351 return;
2352 }
2353
2354 if (!blk_dev_has_tray(blk)) {
2355 /* Ignore this command on tray-less devices */
2356 return;
2357 }
2358
2359 if (blk_dev_is_tray_open(blk)) {
2360 return;
2361 }
2362
2363 locked = blk_dev_is_medium_locked(blk);
2364 if (locked) {
2365 blk_dev_eject_request(blk, force);
2366 }
2367
2368 if (!locked || force) {
2369 blk_dev_change_media_cb(blk, false);
2370 }
2371 }
2372
2373 void qmp_blockdev_close_tray(const char *device, Error **errp)
2374 {
2375 BlockBackend *blk;
2376
2377 blk = blk_by_name(device);
2378 if (!blk) {
2379 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2380 "Device '%s' not found", device);
2381 return;
2382 }
2383
2384 if (!blk_dev_has_removable_media(blk)) {
2385 error_setg(errp, "Device '%s' is not removable", device);
2386 return;
2387 }
2388
2389 if (!blk_dev_has_tray(blk)) {
2390 /* Ignore this command on tray-less devices */
2391 return;
2392 }
2393
2394 if (!blk_dev_is_tray_open(blk)) {
2395 return;
2396 }
2397
2398 blk_dev_change_media_cb(blk, true);
2399 }
2400
2401 void qmp_x_blockdev_remove_medium(const char *device, Error **errp)
2402 {
2403 BlockBackend *blk;
2404 BlockDriverState *bs;
2405 AioContext *aio_context;
2406 bool has_device;
2407
2408 blk = blk_by_name(device);
2409 if (!blk) {
2410 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2411 "Device '%s' not found", device);
2412 return;
2413 }
2414
2415 /* For BBs without a device, we can exchange the BDS tree at will */
2416 has_device = blk_get_attached_dev(blk);
2417
2418 if (has_device && !blk_dev_has_removable_media(blk)) {
2419 error_setg(errp, "Device '%s' is not removable", device);
2420 return;
2421 }
2422
2423 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2424 error_setg(errp, "Tray of device '%s' is not open", device);
2425 return;
2426 }
2427
2428 bs = blk_bs(blk);
2429 if (!bs) {
2430 return;
2431 }
2432
2433 aio_context = bdrv_get_aio_context(bs);
2434 aio_context_acquire(aio_context);
2435
2436 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2437 goto out;
2438 }
2439
2440 blk_remove_bs(blk);
2441
2442 if (!blk_dev_has_tray(blk)) {
2443 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2444 * called at all); therefore, the medium needs to be ejected here.
2445 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2446 * value passed here (i.e. false). */
2447 blk_dev_change_media_cb(blk, false);
2448 }
2449
2450 out:
2451 aio_context_release(aio_context);
2452 }
2453
2454 static void qmp_blockdev_insert_anon_medium(const char *device,
2455 BlockDriverState *bs, Error **errp)
2456 {
2457 BlockBackend *blk;
2458 bool has_device;
2459
2460 blk = blk_by_name(device);
2461 if (!blk) {
2462 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2463 "Device '%s' not found", device);
2464 return;
2465 }
2466
2467 /* For BBs without a device, we can exchange the BDS tree at will */
2468 has_device = blk_get_attached_dev(blk);
2469
2470 if (has_device && !blk_dev_has_removable_media(blk)) {
2471 error_setg(errp, "Device '%s' is not removable", device);
2472 return;
2473 }
2474
2475 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2476 error_setg(errp, "Tray of device '%s' is not open", device);
2477 return;
2478 }
2479
2480 if (blk_bs(blk)) {
2481 error_setg(errp, "There already is a medium in device '%s'", device);
2482 return;
2483 }
2484
2485 blk_insert_bs(blk, bs);
2486
2487 if (!blk_dev_has_tray(blk)) {
2488 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2489 * called at all); therefore, the medium needs to be pushed into the
2490 * slot here.
2491 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2492 * value passed here (i.e. true). */
2493 blk_dev_change_media_cb(blk, true);
2494 }
2495 }
2496
2497 void qmp_x_blockdev_insert_medium(const char *device, const char *node_name,
2498 Error **errp)
2499 {
2500 BlockDriverState *bs;
2501
2502 bs = bdrv_find_node(node_name);
2503 if (!bs) {
2504 error_setg(errp, "Node '%s' not found", node_name);
2505 return;
2506 }
2507
2508 if (bs->blk) {
2509 error_setg(errp, "Node '%s' is already in use by '%s'", node_name,
2510 blk_name(bs->blk));
2511 return;
2512 }
2513
2514 qmp_blockdev_insert_anon_medium(device, bs, errp);
2515 }
2516
2517 void qmp_blockdev_change_medium(const char *device, const char *filename,
2518 bool has_format, const char *format,
2519 bool has_read_only,
2520 BlockdevChangeReadOnlyMode read_only,
2521 Error **errp)
2522 {
2523 BlockBackend *blk;
2524 BlockDriverState *medium_bs = NULL;
2525 int bdrv_flags, ret;
2526 bool writethrough;
2527 QDict *options = NULL;
2528 Error *err = NULL;
2529
2530 blk = blk_by_name(device);
2531 if (!blk) {
2532 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2533 "Device '%s' not found", device);
2534 goto fail;
2535 }
2536
2537 if (blk_bs(blk)) {
2538 blk_update_root_state(blk);
2539 }
2540
2541 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2542 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2543 BDRV_O_PROTOCOL);
2544
2545 /* Must open the image in writeback mode as long as no BlockBackend is
2546 * attached. The right mode can be set as the final step after changing the
2547 * medium. */
2548 writethrough = !(bdrv_flags & BDRV_O_CACHE_WB);
2549 bdrv_flags |= BDRV_O_CACHE_WB;
2550
2551 if (!has_read_only) {
2552 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2553 }
2554
2555 switch (read_only) {
2556 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2557 break;
2558
2559 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2560 bdrv_flags &= ~BDRV_O_RDWR;
2561 break;
2562
2563 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2564 bdrv_flags |= BDRV_O_RDWR;
2565 break;
2566
2567 default:
2568 abort();
2569 }
2570
2571 if (has_format) {
2572 options = qdict_new();
2573 qdict_put(options, "driver", qstring_from_str(format));
2574 }
2575
2576 assert(!medium_bs);
2577 ret = bdrv_open(&medium_bs, filename, NULL, options, bdrv_flags, errp);
2578 if (ret < 0) {
2579 goto fail;
2580 }
2581
2582 blk_apply_root_state(blk, medium_bs);
2583
2584 bdrv_add_key(medium_bs, NULL, &err);
2585 if (err) {
2586 error_propagate(errp, err);
2587 goto fail;
2588 }
2589
2590 qmp_blockdev_open_tray(device, false, false, &err);
2591 if (err) {
2592 error_propagate(errp, err);
2593 goto fail;
2594 }
2595
2596 qmp_x_blockdev_remove_medium(device, &err);
2597 if (err) {
2598 error_propagate(errp, err);
2599 goto fail;
2600 }
2601
2602 qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
2603 if (err) {
2604 error_propagate(errp, err);
2605 goto fail;
2606 }
2607
2608 bdrv_set_enable_write_cache(medium_bs, !writethrough);
2609
2610 qmp_blockdev_close_tray(device, errp);
2611
2612 fail:
2613 /* If the medium has been inserted, the device has its own reference, so
2614 * ours must be relinquished; and if it has not been inserted successfully,
2615 * the reference must be relinquished anyway */
2616 bdrv_unref(medium_bs);
2617 }
2618
2619 /* throttling disk I/O limits */
2620 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2621 int64_t bps_wr,
2622 int64_t iops,
2623 int64_t iops_rd,
2624 int64_t iops_wr,
2625 bool has_bps_max,
2626 int64_t bps_max,
2627 bool has_bps_rd_max,
2628 int64_t bps_rd_max,
2629 bool has_bps_wr_max,
2630 int64_t bps_wr_max,
2631 bool has_iops_max,
2632 int64_t iops_max,
2633 bool has_iops_rd_max,
2634 int64_t iops_rd_max,
2635 bool has_iops_wr_max,
2636 int64_t iops_wr_max,
2637 bool has_bps_max_length,
2638 int64_t bps_max_length,
2639 bool has_bps_rd_max_length,
2640 int64_t bps_rd_max_length,
2641 bool has_bps_wr_max_length,
2642 int64_t bps_wr_max_length,
2643 bool has_iops_max_length,
2644 int64_t iops_max_length,
2645 bool has_iops_rd_max_length,
2646 int64_t iops_rd_max_length,
2647 bool has_iops_wr_max_length,
2648 int64_t iops_wr_max_length,
2649 bool has_iops_size,
2650 int64_t iops_size,
2651 bool has_group,
2652 const char *group, Error **errp)
2653 {
2654 ThrottleConfig cfg;
2655 BlockDriverState *bs;
2656 BlockBackend *blk;
2657 AioContext *aio_context;
2658
2659 blk = blk_by_name(device);
2660 if (!blk) {
2661 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2662 "Device '%s' not found", device);
2663 return;
2664 }
2665
2666 aio_context = blk_get_aio_context(blk);
2667 aio_context_acquire(aio_context);
2668
2669 bs = blk_bs(blk);
2670 if (!bs) {
2671 error_setg(errp, "Device '%s' has no medium", device);
2672 goto out;
2673 }
2674
2675 throttle_config_init(&cfg);
2676 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2677 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2678 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2679
2680 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2681 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2682 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2683
2684 if (has_bps_max) {
2685 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2686 }
2687 if (has_bps_rd_max) {
2688 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2689 }
2690 if (has_bps_wr_max) {
2691 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2692 }
2693 if (has_iops_max) {
2694 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2695 }
2696 if (has_iops_rd_max) {
2697 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2698 }
2699 if (has_iops_wr_max) {
2700 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2701 }
2702
2703 if (has_bps_max_length) {
2704 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = bps_max_length;
2705 }
2706 if (has_bps_rd_max_length) {
2707 cfg.buckets[THROTTLE_BPS_READ].burst_length = bps_rd_max_length;
2708 }
2709 if (has_bps_wr_max_length) {
2710 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = bps_wr_max_length;
2711 }
2712 if (has_iops_max_length) {
2713 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = iops_max_length;
2714 }
2715 if (has_iops_rd_max_length) {
2716 cfg.buckets[THROTTLE_OPS_READ].burst_length = iops_rd_max_length;
2717 }
2718 if (has_iops_wr_max_length) {
2719 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = iops_wr_max_length;
2720 }
2721
2722 if (has_iops_size) {
2723 cfg.op_size = iops_size;
2724 }
2725
2726 if (!throttle_is_valid(&cfg, errp)) {
2727 goto out;
2728 }
2729
2730 if (throttle_enabled(&cfg)) {
2731 /* Enable I/O limits if they're not enabled yet, otherwise
2732 * just update the throttling group. */
2733 if (!bs->throttle_state) {
2734 bdrv_io_limits_enable(bs, has_group ? group : device);
2735 } else if (has_group) {
2736 bdrv_io_limits_update_group(bs, group);
2737 }
2738 /* Set the new throttling configuration */
2739 bdrv_set_io_limits(bs, &cfg);
2740 } else if (bs->throttle_state) {
2741 /* If all throttling settings are set to 0, disable I/O limits */
2742 bdrv_io_limits_disable(bs);
2743 }
2744
2745 out:
2746 aio_context_release(aio_context);
2747 }
2748
2749 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2750 bool has_granularity, uint32_t granularity,
2751 Error **errp)
2752 {
2753 AioContext *aio_context;
2754 BlockDriverState *bs;
2755
2756 if (!name || name[0] == '\0') {
2757 error_setg(errp, "Bitmap name cannot be empty");
2758 return;
2759 }
2760
2761 bs = bdrv_lookup_bs(node, node, errp);
2762 if (!bs) {
2763 return;
2764 }
2765
2766 aio_context = bdrv_get_aio_context(bs);
2767 aio_context_acquire(aio_context);
2768
2769 if (has_granularity) {
2770 if (granularity < 512 || !is_power_of_2(granularity)) {
2771 error_setg(errp, "Granularity must be power of 2 "
2772 "and at least 512");
2773 goto out;
2774 }
2775 } else {
2776 /* Default to cluster size, if available: */
2777 granularity = bdrv_get_default_bitmap_granularity(bs);
2778 }
2779
2780 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2781
2782 out:
2783 aio_context_release(aio_context);
2784 }
2785
2786 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2787 Error **errp)
2788 {
2789 AioContext *aio_context;
2790 BlockDriverState *bs;
2791 BdrvDirtyBitmap *bitmap;
2792
2793 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2794 if (!bitmap || !bs) {
2795 return;
2796 }
2797
2798 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2799 error_setg(errp,
2800 "Bitmap '%s' is currently frozen and cannot be removed",
2801 name);
2802 goto out;
2803 }
2804 bdrv_dirty_bitmap_make_anon(bitmap);
2805 bdrv_release_dirty_bitmap(bs, bitmap);
2806
2807 out:
2808 aio_context_release(aio_context);
2809 }
2810
2811 /**
2812 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2813 * immediately after a full backup operation.
2814 */
2815 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2816 Error **errp)
2817 {
2818 AioContext *aio_context;
2819 BdrvDirtyBitmap *bitmap;
2820 BlockDriverState *bs;
2821
2822 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2823 if (!bitmap || !bs) {
2824 return;
2825 }
2826
2827 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2828 error_setg(errp,
2829 "Bitmap '%s' is currently frozen and cannot be modified",
2830 name);
2831 goto out;
2832 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2833 error_setg(errp,
2834 "Bitmap '%s' is currently disabled and cannot be cleared",
2835 name);
2836 goto out;
2837 }
2838
2839 bdrv_clear_dirty_bitmap(bitmap, NULL);
2840
2841 out:
2842 aio_context_release(aio_context);
2843 }
2844
2845 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2846 {
2847 const char *id = qdict_get_str(qdict, "id");
2848 BlockBackend *blk;
2849 BlockDriverState *bs;
2850 AioContext *aio_context;
2851 Error *local_err = NULL;
2852
2853 bs = bdrv_find_node(id);
2854 if (bs) {
2855 qmp_x_blockdev_del(false, NULL, true, id, &local_err);
2856 if (local_err) {
2857 error_report_err(local_err);
2858 }
2859 return;
2860 }
2861
2862 blk = blk_by_name(id);
2863 if (!blk) {
2864 error_report("Device '%s' not found", id);
2865 return;
2866 }
2867
2868 if (!blk_legacy_dinfo(blk)) {
2869 error_report("Deleting device added with blockdev-add"
2870 " is not supported");
2871 return;
2872 }
2873
2874 aio_context = blk_get_aio_context(blk);
2875 aio_context_acquire(aio_context);
2876
2877 bs = blk_bs(blk);
2878 if (bs) {
2879 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2880 error_report_err(local_err);
2881 aio_context_release(aio_context);
2882 return;
2883 }
2884
2885 blk_remove_bs(blk);
2886 }
2887
2888 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2889 monitor_remove_blk(blk);
2890
2891 /* If this BlockBackend has a device attached to it, its refcount will be
2892 * decremented when the device is removed; otherwise we have to do so here.
2893 */
2894 if (blk_get_attached_dev(blk)) {
2895 /* Further I/O must not pause the guest */
2896 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2897 BLOCKDEV_ON_ERROR_REPORT);
2898 } else {
2899 blk_unref(blk);
2900 }
2901
2902 aio_context_release(aio_context);
2903 }
2904
2905 void qmp_block_resize(bool has_device, const char *device,
2906 bool has_node_name, const char *node_name,
2907 int64_t size, Error **errp)
2908 {
2909 Error *local_err = NULL;
2910 BlockDriverState *bs;
2911 AioContext *aio_context;
2912 int ret;
2913
2914 bs = bdrv_lookup_bs(has_device ? device : NULL,
2915 has_node_name ? node_name : NULL,
2916 &local_err);
2917 if (local_err) {
2918 error_propagate(errp, local_err);
2919 return;
2920 }
2921
2922 aio_context = bdrv_get_aio_context(bs);
2923 aio_context_acquire(aio_context);
2924
2925 if (!bdrv_is_first_non_filter(bs)) {
2926 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2927 goto out;
2928 }
2929
2930 if (size < 0) {
2931 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2932 goto out;
2933 }
2934
2935 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2936 error_setg(errp, QERR_DEVICE_IN_USE, device);
2937 goto out;
2938 }
2939
2940 /* complete all in-flight operations before resizing the device */
2941 bdrv_drain_all();
2942
2943 ret = bdrv_truncate(bs, size);
2944 switch (ret) {
2945 case 0:
2946 break;
2947 case -ENOMEDIUM:
2948 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2949 break;
2950 case -ENOTSUP:
2951 error_setg(errp, QERR_UNSUPPORTED);
2952 break;
2953 case -EACCES:
2954 error_setg(errp, "Device '%s' is read only", device);
2955 break;
2956 case -EBUSY:
2957 error_setg(errp, QERR_DEVICE_IN_USE, device);
2958 break;
2959 default:
2960 error_setg_errno(errp, -ret, "Could not resize");
2961 break;
2962 }
2963
2964 out:
2965 aio_context_release(aio_context);
2966 }
2967
2968 static void block_job_cb(void *opaque, int ret)
2969 {
2970 /* Note that this function may be executed from another AioContext besides
2971 * the QEMU main loop. If you need to access anything that assumes the
2972 * QEMU global mutex, use a BH or introduce a mutex.
2973 */
2974
2975 BlockDriverState *bs = opaque;
2976 const char *msg = NULL;
2977
2978 trace_block_job_cb(bs, bs->job, ret);
2979
2980 assert(bs->job);
2981
2982 if (ret < 0) {
2983 msg = strerror(-ret);
2984 }
2985
2986 if (block_job_is_cancelled(bs->job)) {
2987 block_job_event_cancelled(bs->job);
2988 } else {
2989 block_job_event_completed(bs->job, msg);
2990 }
2991 }
2992
2993 void qmp_block_stream(const char *device,
2994 bool has_base, const char *base,
2995 bool has_backing_file, const char *backing_file,
2996 bool has_speed, int64_t speed,
2997 bool has_on_error, BlockdevOnError on_error,
2998 Error **errp)
2999 {
3000 BlockBackend *blk;
3001 BlockDriverState *bs;
3002 BlockDriverState *base_bs = NULL;
3003 AioContext *aio_context;
3004 Error *local_err = NULL;
3005 const char *base_name = NULL;
3006
3007 if (!has_on_error) {
3008 on_error = BLOCKDEV_ON_ERROR_REPORT;
3009 }
3010
3011 blk = blk_by_name(device);
3012 if (!blk) {
3013 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3014 "Device '%s' not found", device);
3015 return;
3016 }
3017
3018 aio_context = blk_get_aio_context(blk);
3019 aio_context_acquire(aio_context);
3020
3021 if (!blk_is_available(blk)) {
3022 error_setg(errp, "Device '%s' has no medium", device);
3023 goto out;
3024 }
3025 bs = blk_bs(blk);
3026
3027 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
3028 goto out;
3029 }
3030
3031 if (has_base) {
3032 base_bs = bdrv_find_backing_image(bs, base);
3033 if (base_bs == NULL) {
3034 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3035 goto out;
3036 }
3037 assert(bdrv_get_aio_context(base_bs) == aio_context);
3038 base_name = base;
3039 }
3040
3041 /* if we are streaming the entire chain, the result will have no backing
3042 * file, and specifying one is therefore an error */
3043 if (base_bs == NULL && has_backing_file) {
3044 error_setg(errp, "backing file specified, but streaming the "
3045 "entire chain");
3046 goto out;
3047 }
3048
3049 /* backing_file string overrides base bs filename */
3050 base_name = has_backing_file ? backing_file : base_name;
3051
3052 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
3053 on_error, block_job_cb, bs, &local_err);
3054 if (local_err) {
3055 error_propagate(errp, local_err);
3056 goto out;
3057 }
3058
3059 trace_qmp_block_stream(bs, bs->job);
3060
3061 out:
3062 aio_context_release(aio_context);
3063 }
3064
3065 void qmp_block_commit(const char *device,
3066 bool has_base, const char *base,
3067 bool has_top, const char *top,
3068 bool has_backing_file, const char *backing_file,
3069 bool has_speed, int64_t speed,
3070 Error **errp)
3071 {
3072 BlockBackend *blk;
3073 BlockDriverState *bs;
3074 BlockDriverState *base_bs, *top_bs;
3075 AioContext *aio_context;
3076 Error *local_err = NULL;
3077 /* This will be part of the QMP command, if/when the
3078 * BlockdevOnError change for blkmirror makes it in
3079 */
3080 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3081
3082 if (!has_speed) {
3083 speed = 0;
3084 }
3085
3086 /* Important Note:
3087 * libvirt relies on the DeviceNotFound error class in order to probe for
3088 * live commit feature versions; for this to work, we must make sure to
3089 * perform the device lookup before any generic errors that may occur in a
3090 * scenario in which all optional arguments are omitted. */
3091 blk = blk_by_name(device);
3092 if (!blk) {
3093 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3094 "Device '%s' not found", device);
3095 return;
3096 }
3097
3098 aio_context = blk_get_aio_context(blk);
3099 aio_context_acquire(aio_context);
3100
3101 if (!blk_is_available(blk)) {
3102 error_setg(errp, "Device '%s' has no medium", device);
3103 goto out;
3104 }
3105 bs = blk_bs(blk);
3106
3107 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3108 goto out;
3109 }
3110
3111 /* default top_bs is the active layer */
3112 top_bs = bs;
3113
3114 if (has_top && top) {
3115 if (strcmp(bs->filename, top) != 0) {
3116 top_bs = bdrv_find_backing_image(bs, top);
3117 }
3118 }
3119
3120 if (top_bs == NULL) {
3121 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3122 goto out;
3123 }
3124
3125 assert(bdrv_get_aio_context(top_bs) == aio_context);
3126
3127 if (has_base && base) {
3128 base_bs = bdrv_find_backing_image(top_bs, base);
3129 } else {
3130 base_bs = bdrv_find_base(top_bs);
3131 }
3132
3133 if (base_bs == NULL) {
3134 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3135 goto out;
3136 }
3137
3138 assert(bdrv_get_aio_context(base_bs) == aio_context);
3139
3140 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3141 goto out;
3142 }
3143
3144 /* Do not allow attempts to commit an image into itself */
3145 if (top_bs == base_bs) {
3146 error_setg(errp, "cannot commit an image into itself");
3147 goto out;
3148 }
3149
3150 if (top_bs == bs) {
3151 if (has_backing_file) {
3152 error_setg(errp, "'backing-file' specified,"
3153 " but 'top' is the active layer");
3154 goto out;
3155 }
3156 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
3157 bs, &local_err);
3158 } else {
3159 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
3160 has_backing_file ? backing_file : NULL, &local_err);
3161 }
3162 if (local_err != NULL) {
3163 error_propagate(errp, local_err);
3164 goto out;
3165 }
3166
3167 out:
3168 aio_context_release(aio_context);
3169 }
3170
3171 static void do_drive_backup(const char *device, const char *target,
3172 bool has_format, const char *format,
3173 enum MirrorSyncMode sync,
3174 bool has_mode, enum NewImageMode mode,
3175 bool has_speed, int64_t speed,
3176 bool has_bitmap, const char *bitmap,
3177 bool has_on_source_error,
3178 BlockdevOnError on_source_error,
3179 bool has_on_target_error,
3180 BlockdevOnError on_target_error,
3181 BlockJobTxn *txn, Error **errp)
3182 {
3183 BlockBackend *blk;
3184 BlockDriverState *bs;
3185 BlockDriverState *target_bs;
3186 BlockDriverState *source = NULL;
3187 BdrvDirtyBitmap *bmap = NULL;
3188 AioContext *aio_context;
3189 QDict *options = NULL;
3190 Error *local_err = NULL;
3191 int flags;
3192 int64_t size;
3193 int ret;
3194
3195 if (!has_speed) {
3196 speed = 0;
3197 }
3198 if (!has_on_source_error) {
3199 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3200 }
3201 if (!has_on_target_error) {
3202 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3203 }
3204 if (!has_mode) {
3205 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3206 }
3207
3208 blk = blk_by_name(device);
3209 if (!blk) {
3210 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3211 "Device '%s' not found", device);
3212 return;
3213 }
3214
3215 aio_context = blk_get_aio_context(blk);
3216 aio_context_acquire(aio_context);
3217
3218 /* Although backup_run has this check too, we need to use bs->drv below, so
3219 * do an early check redundantly. */
3220 if (!blk_is_available(blk)) {
3221 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3222 goto out;
3223 }
3224 bs = blk_bs(blk);
3225
3226 if (!has_format) {
3227 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3228 }
3229
3230 /* Early check to avoid creating target */
3231 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3232 goto out;
3233 }
3234
3235 flags = bs->open_flags | BDRV_O_CACHE_WB | BDRV_O_RDWR;
3236
3237 /* See if we have a backing HD we can use to create our new image
3238 * on top of. */
3239 if (sync == MIRROR_SYNC_MODE_TOP) {
3240 source = backing_bs(bs);
3241 if (!source) {
3242 sync = MIRROR_SYNC_MODE_FULL;
3243 }
3244 }
3245 if (sync == MIRROR_SYNC_MODE_NONE) {
3246 source = bs;
3247 }
3248
3249 size = bdrv_getlength(bs);
3250 if (size < 0) {
3251 error_setg_errno(errp, -size, "bdrv_getlength failed");
3252 goto out;
3253 }
3254
3255 if (mode != NEW_IMAGE_MODE_EXISTING) {
3256 assert(format);
3257 if (source) {
3258 bdrv_img_create(target, format, source->filename,
3259 source->drv->format_name, NULL,
3260 size, flags, &local_err, false);
3261 } else {
3262 bdrv_img_create(target, format, NULL, NULL, NULL,
3263 size, flags, &local_err, false);
3264 }
3265 }
3266
3267 if (local_err) {
3268 error_propagate(errp, local_err);
3269 goto out;
3270 }
3271
3272 if (format) {
3273 options = qdict_new();
3274 qdict_put(options, "driver", qstring_from_str(format));
3275 }
3276
3277 target_bs = NULL;
3278 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
3279 if (ret < 0) {
3280 error_propagate(errp, local_err);
3281 goto out;
3282 }
3283
3284 bdrv_set_aio_context(target_bs, aio_context);
3285
3286 if (has_bitmap) {
3287 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
3288 if (!bmap) {
3289 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
3290 bdrv_unref(target_bs);
3291 goto out;
3292 }
3293 }
3294
3295 backup_start(bs, target_bs, speed, sync, bmap,
3296 on_source_error, on_target_error,
3297 block_job_cb, bs, txn, &local_err);
3298 if (local_err != NULL) {
3299 bdrv_unref(target_bs);
3300 error_propagate(errp, local_err);
3301 goto out;
3302 }
3303
3304 out:
3305 aio_context_release(aio_context);
3306 }
3307
3308 void qmp_drive_backup(const char *device, const char *target,
3309 bool has_format, const char *format,
3310 enum MirrorSyncMode sync,
3311 bool has_mode, enum NewImageMode mode,
3312 bool has_speed, int64_t speed,
3313 bool has_bitmap, const char *bitmap,
3314 bool has_on_source_error, BlockdevOnError on_source_error,
3315 bool has_on_target_error, BlockdevOnError on_target_error,
3316 Error **errp)
3317 {
3318 return do_drive_backup(device, target, has_format, format, sync,
3319 has_mode, mode, has_speed, speed,
3320 has_bitmap, bitmap,
3321 has_on_source_error, on_source_error,
3322 has_on_target_error, on_target_error,
3323 NULL, errp);
3324 }
3325
3326 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3327 {
3328 return bdrv_named_nodes_list(errp);
3329 }
3330
3331 void do_blockdev_backup(const char *device, const char *target,
3332 enum MirrorSyncMode sync,
3333 bool has_speed, int64_t speed,
3334 bool has_on_source_error,
3335 BlockdevOnError on_source_error,
3336 bool has_on_target_error,
3337 BlockdevOnError on_target_error,
3338 BlockJobTxn *txn, Error **errp)
3339 {
3340 BlockBackend *blk, *target_blk;
3341 BlockDriverState *bs;
3342 BlockDriverState *target_bs;
3343 Error *local_err = NULL;
3344 AioContext *aio_context;
3345
3346 if (!has_speed) {
3347 speed = 0;
3348 }
3349 if (!has_on_source_error) {
3350 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3351 }
3352 if (!has_on_target_error) {
3353 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3354 }
3355
3356 blk = blk_by_name(device);
3357 if (!blk) {
3358 error_setg(errp, "Device '%s' not found", device);
3359 return;
3360 }
3361
3362 aio_context = blk_get_aio_context(blk);
3363 aio_context_acquire(aio_context);
3364
3365 if (!blk_is_available(blk)) {
3366 error_setg(errp, "Device '%s' has no medium", device);
3367 goto out;
3368 }
3369 bs = blk_bs(blk);
3370
3371 target_blk = blk_by_name(target);
3372 if (!target_blk) {
3373 error_setg(errp, "Device '%s' not found", target);
3374 goto out;
3375 }
3376
3377 if (!blk_is_available(target_blk)) {
3378 error_setg(errp, "Device '%s' has no medium", target);
3379 goto out;
3380 }
3381 target_bs = blk_bs(target_blk);
3382
3383 bdrv_ref(target_bs);
3384 bdrv_set_aio_context(target_bs, aio_context);
3385 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
3386 on_target_error, block_job_cb, bs, txn, &local_err);
3387 if (local_err != NULL) {
3388 bdrv_unref(target_bs);
3389 error_propagate(errp, local_err);
3390 }
3391 out:
3392 aio_context_release(aio_context);
3393 }
3394
3395 void qmp_blockdev_backup(const char *device, const char *target,
3396 enum MirrorSyncMode sync,
3397 bool has_speed, int64_t speed,
3398 bool has_on_source_error,
3399 BlockdevOnError on_source_error,
3400 bool has_on_target_error,
3401 BlockdevOnError on_target_error,
3402 Error **errp)
3403 {
3404 do_blockdev_backup(device, target, sync, has_speed, speed,
3405 has_on_source_error, on_source_error,
3406 has_on_target_error, on_target_error,
3407 NULL, errp);
3408 }
3409
3410 /* Parameter check and block job starting for drive mirroring.
3411 * Caller should hold @device and @target's aio context (must be the same).
3412 **/
3413 static void blockdev_mirror_common(BlockDriverState *bs,
3414 BlockDriverState *target,
3415 bool has_replaces, const char *replaces,
3416 enum MirrorSyncMode sync,
3417 bool has_speed, int64_t speed,
3418 bool has_granularity, uint32_t granularity,
3419 bool has_buf_size, int64_t buf_size,
3420 bool has_on_source_error,
3421 BlockdevOnError on_source_error,
3422 bool has_on_target_error,
3423 BlockdevOnError on_target_error,
3424 bool has_unmap, bool unmap,
3425 Error **errp)
3426 {
3427
3428 if (!has_speed) {
3429 speed = 0;
3430 }
3431 if (!has_on_source_error) {
3432 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3433 }
3434 if (!has_on_target_error) {
3435 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3436 }
3437 if (!has_granularity) {
3438 granularity = 0;
3439 }
3440 if (!has_buf_size) {
3441 buf_size = 0;
3442 }
3443 if (!has_unmap) {
3444 unmap = true;
3445 }
3446
3447 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3448 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3449 "a value in range [512B, 64MB]");
3450 return;
3451 }
3452 if (granularity & (granularity - 1)) {
3453 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3454 "power of 2");
3455 return;
3456 }
3457
3458 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3459 return;
3460 }
3461 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3462 return;
3463 }
3464 if (target->blk) {
3465 error_setg(errp, "Cannot mirror to an attached block device");
3466 return;
3467 }
3468
3469 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3470 sync = MIRROR_SYNC_MODE_FULL;
3471 }
3472
3473 /* pass the node name to replace to mirror start since it's loose coupling
3474 * and will allow to check whether the node still exist at mirror completion
3475 */
3476 mirror_start(bs, target,
3477 has_replaces ? replaces : NULL,
3478 speed, granularity, buf_size, sync,
3479 on_source_error, on_target_error, unmap,
3480 block_job_cb, bs, errp);
3481 }
3482
3483 void qmp_drive_mirror(const char *device, const char *target,
3484 bool has_format, const char *format,
3485 bool has_node_name, const char *node_name,
3486 bool has_replaces, const char *replaces,
3487 enum MirrorSyncMode sync,
3488 bool has_mode, enum NewImageMode mode,
3489 bool has_speed, int64_t speed,
3490 bool has_granularity, uint32_t granularity,
3491 bool has_buf_size, int64_t buf_size,
3492 bool has_on_source_error, BlockdevOnError on_source_error,
3493 bool has_on_target_error, BlockdevOnError on_target_error,
3494 bool has_unmap, bool unmap,
3495 Error **errp)
3496 {
3497 BlockDriverState *bs;
3498 BlockBackend *blk;
3499 BlockDriverState *source, *target_bs;
3500 AioContext *aio_context;
3501 Error *local_err = NULL;
3502 QDict *options = NULL;
3503 int flags;
3504 int64_t size;
3505 int ret;
3506
3507 blk = blk_by_name(device);
3508 if (!blk) {
3509 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3510 "Device '%s' not found", device);
3511 return;
3512 }
3513
3514 aio_context = blk_get_aio_context(blk);
3515 aio_context_acquire(aio_context);
3516
3517 if (!blk_is_available(blk)) {
3518 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3519 goto out;
3520 }
3521 bs = blk_bs(blk);
3522 if (!has_mode) {
3523 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3524 }
3525
3526 if (!has_format) {
3527 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3528 }
3529
3530 flags = bs->open_flags | BDRV_O_CACHE_WB | BDRV_O_RDWR;
3531 source = backing_bs(bs);
3532 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3533 sync = MIRROR_SYNC_MODE_FULL;
3534 }
3535 if (sync == MIRROR_SYNC_MODE_NONE) {
3536 source = bs;
3537 }
3538
3539 size = bdrv_getlength(bs);
3540 if (size < 0) {
3541 error_setg_errno(errp, -size, "bdrv_getlength failed");
3542 goto out;
3543 }
3544
3545 if (has_replaces) {
3546 BlockDriverState *to_replace_bs;
3547 AioContext *replace_aio_context;
3548 int64_t replace_size;
3549
3550 if (!has_node_name) {
3551 error_setg(errp, "a node-name must be provided when replacing a"
3552 " named node of the graph");
3553 goto out;
3554 }
3555
3556 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3557
3558 if (!to_replace_bs) {
3559 error_propagate(errp, local_err);
3560 goto out;
3561 }
3562
3563 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3564 aio_context_acquire(replace_aio_context);
3565 replace_size = bdrv_getlength(to_replace_bs);
3566 aio_context_release(replace_aio_context);
3567
3568 if (size != replace_size) {
3569 error_setg(errp, "cannot replace image with a mirror image of "
3570 "different size");
3571 goto out;
3572 }
3573 }
3574
3575 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3576 && mode != NEW_IMAGE_MODE_EXISTING)
3577 {
3578 /* create new image w/o backing file */
3579 assert(format);
3580 bdrv_img_create(target, format,
3581 NULL, NULL, NULL, size, flags, &local_err, false);
3582 } else {
3583 switch (mode) {
3584 case NEW_IMAGE_MODE_EXISTING:
3585 break;
3586 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3587 /* create new image with backing file */
3588 bdrv_img_create(target, format,
3589 source->filename,
3590 source->drv->format_name,
3591 NULL, size, flags, &local_err, false);
3592 break;
3593 default:
3594 abort();
3595 }
3596 }
3597
3598 if (local_err) {
3599 error_propagate(errp, local_err);
3600 goto out;
3601 }
3602
3603 options = qdict_new();
3604 if (has_node_name) {
3605 qdict_put(options, "node-name", qstring_from_str(node_name));
3606 }
3607 if (format) {
3608 qdict_put(options, "driver", qstring_from_str(format));
3609 }
3610
3611 /* Mirroring takes care of copy-on-write using the source's backing
3612 * file.
3613 */
3614 target_bs = NULL;
3615 ret = bdrv_open(&target_bs, target, NULL, options,
3616 flags | BDRV_O_NO_BACKING, &local_err);
3617 if (ret < 0) {
3618 error_propagate(errp, local_err);
3619 goto out;
3620 }
3621
3622 bdrv_set_aio_context(target_bs, aio_context);
3623
3624 blockdev_mirror_common(bs, target_bs,
3625 has_replaces, replaces, sync,
3626 has_speed, speed,
3627 has_granularity, granularity,
3628 has_buf_size, buf_size,
3629 has_on_source_error, on_source_error,
3630 has_on_target_error, on_target_error,
3631 has_unmap, unmap,
3632 &local_err);
3633 if (local_err) {
3634 error_propagate(errp, local_err);
3635 bdrv_unref(target_bs);
3636 }
3637 out:
3638 aio_context_release(aio_context);
3639 }
3640
3641 void qmp_blockdev_mirror(const char *device, const char *target,
3642 bool has_replaces, const char *replaces,
3643 MirrorSyncMode sync,
3644 bool has_speed, int64_t speed,
3645 bool has_granularity, uint32_t granularity,
3646 bool has_buf_size, int64_t buf_size,
3647 bool has_on_source_error,
3648 BlockdevOnError on_source_error,
3649 bool has_on_target_error,
3650 BlockdevOnError on_target_error,
3651 Error **errp)
3652 {
3653 BlockDriverState *bs;
3654 BlockBackend *blk;
3655 BlockDriverState *target_bs;
3656 AioContext *aio_context;
3657 Error *local_err = NULL;
3658
3659 blk = blk_by_name(device);
3660 if (!blk) {
3661 error_setg(errp, "Device '%s' not found", device);
3662 return;
3663 }
3664 bs = blk_bs(blk);
3665
3666 if (!bs) {
3667 error_setg(errp, "Device '%s' has no media", device);
3668 return;
3669 }
3670
3671 target_bs = bdrv_lookup_bs(target, target, errp);
3672 if (!target_bs) {
3673 return;
3674 }
3675
3676 aio_context = bdrv_get_aio_context(bs);
3677 aio_context_acquire(aio_context);
3678
3679 bdrv_ref(target_bs);
3680 bdrv_set_aio_context(target_bs, aio_context);
3681
3682 blockdev_mirror_common(bs, target_bs,
3683 has_replaces, replaces, sync,
3684 has_speed, speed,
3685 has_granularity, granularity,
3686 has_buf_size, buf_size,
3687 has_on_source_error, on_source_error,
3688 has_on_target_error, on_target_error,
3689 true, true,
3690 &local_err);
3691 if (local_err) {
3692 error_propagate(errp, local_err);
3693 bdrv_unref(target_bs);
3694 }
3695
3696 aio_context_release(aio_context);
3697 }
3698
3699 /* Get the block job for a given device name and acquire its AioContext */
3700 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3701 Error **errp)
3702 {
3703 BlockBackend *blk;
3704 BlockDriverState *bs;
3705
3706 *aio_context = NULL;
3707
3708 blk = blk_by_name(device);
3709 if (!blk) {
3710 goto notfound;
3711 }
3712
3713 *aio_context = blk_get_aio_context(blk);
3714 aio_context_acquire(*aio_context);
3715
3716 if (!blk_is_available(blk)) {
3717 goto notfound;
3718 }
3719 bs = blk_bs(blk);
3720
3721 if (!bs->job) {
3722 goto notfound;
3723 }
3724
3725 return bs->job;
3726
3727 notfound:
3728 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3729 "No active block job on device '%s'", device);
3730 if (*aio_context) {
3731 aio_context_release(*aio_context);
3732 *aio_context = NULL;
3733 }
3734 return NULL;
3735 }
3736
3737 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3738 {
3739 AioContext *aio_context;
3740 BlockJob *job = find_block_job(device, &aio_context, errp);
3741
3742 if (!job) {
3743 return;
3744 }
3745
3746 block_job_set_speed(job, speed, errp);
3747 aio_context_release(aio_context);
3748 }
3749
3750 void qmp_block_job_cancel(const char *device,
3751 bool has_force, bool force, Error **errp)
3752 {
3753 AioContext *aio_context;
3754 BlockJob *job = find_block_job(device, &aio_context, errp);
3755
3756 if (!job) {
3757 return;
3758 }
3759
3760 if (!has_force) {
3761 force = false;
3762 }
3763
3764 if (job->user_paused && !force) {
3765 error_setg(errp, "The block job for device '%s' is currently paused",
3766 device);
3767 goto out;
3768 }
3769
3770 trace_qmp_block_job_cancel(job);
3771 block_job_cancel(job);
3772 out:
3773 aio_context_release(aio_context);
3774 }
3775
3776 void qmp_block_job_pause(const char *device, Error **errp)
3777 {
3778 AioContext *aio_context;
3779 BlockJob *job = find_block_job(device, &aio_context, errp);
3780
3781 if (!job || job->user_paused) {
3782 return;
3783 }
3784
3785 job->user_paused = true;
3786 trace_qmp_block_job_pause(job);
3787 block_job_pause(job);
3788 aio_context_release(aio_context);
3789 }
3790
3791 void qmp_block_job_resume(const char *device, Error **errp)
3792 {
3793 AioContext *aio_context;
3794 BlockJob *job = find_block_job(device, &aio_context, errp);
3795
3796 if (!job || !job->user_paused) {
3797 return;
3798 }
3799
3800 job->user_paused = false;
3801 trace_qmp_block_job_resume(job);
3802 block_job_resume(job);
3803 aio_context_release(aio_context);
3804 }
3805
3806 void qmp_block_job_complete(const char *device, Error **errp)
3807 {
3808 AioContext *aio_context;
3809 BlockJob *job = find_block_job(device, &aio_context, errp);
3810
3811 if (!job) {
3812 return;
3813 }
3814
3815 trace_qmp_block_job_complete(job);
3816 block_job_complete(job, errp);
3817 aio_context_release(aio_context);
3818 }
3819
3820 void qmp_change_backing_file(const char *device,
3821 const char *image_node_name,
3822 const char *backing_file,
3823 Error **errp)
3824 {
3825 BlockBackend *blk;
3826 BlockDriverState *bs = NULL;
3827 AioContext *aio_context;
3828 BlockDriverState *image_bs = NULL;
3829 Error *local_err = NULL;
3830 bool ro;
3831 int open_flags;
3832 int ret;
3833
3834 blk = blk_by_name(device);
3835 if (!blk) {
3836 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3837 "Device '%s' not found", device);
3838 return;
3839 }
3840
3841 aio_context = blk_get_aio_context(blk);
3842 aio_context_acquire(aio_context);
3843
3844 if (!blk_is_available(blk)) {
3845 error_setg(errp, "Device '%s' has no medium", device);
3846 goto out;
3847 }
3848 bs = blk_bs(blk);
3849
3850 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3851 if (local_err) {
3852 error_propagate(errp, local_err);
3853 goto out;
3854 }
3855
3856 if (!image_bs) {
3857 error_setg(errp, "image file not found");
3858 goto out;
3859 }
3860
3861 if (bdrv_find_base(image_bs) == image_bs) {
3862 error_setg(errp, "not allowing backing file change on an image "
3863 "without a backing file");
3864 goto out;
3865 }
3866
3867 /* even though we are not necessarily operating on bs, we need it to
3868 * determine if block ops are currently prohibited on the chain */
3869 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3870 goto out;
3871 }
3872
3873 /* final sanity check */
3874 if (!bdrv_chain_contains(bs, image_bs)) {
3875 error_setg(errp, "'%s' and image file are not in the same chain",
3876 device);
3877 goto out;
3878 }
3879
3880 /* if not r/w, reopen to make r/w */
3881 open_flags = image_bs->open_flags;
3882 ro = bdrv_is_read_only(image_bs);
3883
3884 if (ro) {
3885 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3886 if (local_err) {
3887 error_propagate(errp, local_err);
3888 goto out;
3889 }
3890 }
3891
3892 ret = bdrv_change_backing_file(image_bs, backing_file,
3893 image_bs->drv ? image_bs->drv->format_name : "");
3894
3895 if (ret < 0) {
3896 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3897 backing_file);
3898 /* don't exit here, so we can try to restore open flags if
3899 * appropriate */
3900 }
3901
3902 if (ro) {
3903 bdrv_reopen(image_bs, open_flags, &local_err);
3904 if (local_err) {
3905 error_propagate(errp, local_err); /* will preserve prior errp */
3906 }
3907 }
3908
3909 out:
3910 aio_context_release(aio_context);
3911 }
3912
3913 void hmp_drive_add_node(Monitor *mon, const char *optstr)
3914 {
3915 QemuOpts *opts;
3916 QDict *qdict;
3917 Error *local_err = NULL;
3918
3919 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
3920 if (!opts) {
3921 return;
3922 }
3923
3924 qdict = qemu_opts_to_qdict(opts, NULL);
3925
3926 if (!qdict_get_try_str(qdict, "node-name")) {
3927 QDECREF(qdict);
3928 error_report("'node-name' needs to be specified");
3929 goto out;
3930 }
3931
3932 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
3933 if (!bs) {
3934 error_report_err(local_err);
3935 goto out;
3936 }
3937
3938 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3939
3940 out:
3941 qemu_opts_del(opts);
3942 }
3943
3944 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3945 {
3946 QmpOutputVisitor *ov = qmp_output_visitor_new();
3947 BlockDriverState *bs;
3948 BlockBackend *blk = NULL;
3949 QObject *obj;
3950 QDict *qdict;
3951 Error *local_err = NULL;
3952
3953 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3954 * cache.direct=false instead of silently switching to aio=threads, except
3955 * when called from drive_new().
3956 *
3957 * For now, simply forbidding the combination for all drivers will do. */
3958 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3959 bool direct = options->has_cache &&
3960 options->cache->has_direct &&
3961 options->cache->direct;
3962 if (!direct) {
3963 error_setg(errp, "aio=native requires cache.direct=true");
3964 goto fail;
3965 }
3966 }
3967
3968 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), NULL, &options,
3969 &local_err);
3970 if (local_err) {
3971 error_propagate(errp, local_err);
3972 goto fail;
3973 }
3974
3975 obj = qmp_output_get_qobject(ov);
3976 qdict = qobject_to_qdict(obj);
3977
3978 qdict_flatten(qdict);
3979
3980 if (options->has_id) {
3981 blk = blockdev_init(NULL, qdict, &local_err);
3982 if (local_err) {
3983 error_propagate(errp, local_err);
3984 goto fail;
3985 }
3986
3987 bs = blk_bs(blk);
3988 } else {
3989 if (!qdict_get_try_str(qdict, "node-name")) {
3990 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3991 "the root node");
3992 goto fail;
3993 }
3994
3995 bs = bds_tree_init(qdict, errp);
3996 if (!bs) {
3997 goto fail;
3998 }
3999
4000 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4001 }
4002
4003 if (bs && bdrv_key_required(bs)) {
4004 if (blk) {
4005 monitor_remove_blk(blk);
4006 blk_unref(blk);
4007 } else {
4008 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4009 bdrv_unref(bs);
4010 }
4011 error_setg(errp, "blockdev-add doesn't support encrypted devices");
4012 goto fail;
4013 }
4014
4015 fail:
4016 qmp_output_visitor_cleanup(ov);
4017 }
4018
4019 void qmp_x_blockdev_del(bool has_id, const char *id,
4020 bool has_node_name, const char *node_name, Error **errp)
4021 {
4022 AioContext *aio_context;
4023 BlockBackend *blk;
4024 BlockDriverState *bs;
4025
4026 if (has_id && has_node_name) {
4027 error_setg(errp, "Only one of id and node-name must be specified");
4028 return;
4029 } else if (!has_id && !has_node_name) {
4030 error_setg(errp, "No block device specified");
4031 return;
4032 }
4033
4034 if (has_id) {
4035 /* blk_by_name() never returns a BB that is not owned by the monitor */
4036 blk = blk_by_name(id);
4037 if (!blk) {
4038 error_setg(errp, "Cannot find block backend %s", id);
4039 return;
4040 }
4041 if (blk_get_refcnt(blk) > 1) {
4042 error_setg(errp, "Block backend %s is in use", id);
4043 return;
4044 }
4045 bs = blk_bs(blk);
4046 aio_context = blk_get_aio_context(blk);
4047 } else {
4048 bs = bdrv_find_node(node_name);
4049 if (!bs) {
4050 error_setg(errp, "Cannot find node %s", node_name);
4051 return;
4052 }
4053 blk = bs->blk;
4054 if (blk) {
4055 error_setg(errp, "Node %s is in use by %s",
4056 node_name, blk_name(blk));
4057 return;
4058 }
4059 aio_context = bdrv_get_aio_context(bs);
4060 }
4061
4062 aio_context_acquire(aio_context);
4063
4064 if (bs) {
4065 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4066 goto out;
4067 }
4068
4069 if (!blk && !bs->monitor_list.tqe_prev) {
4070 error_setg(errp, "Node %s is not owned by the monitor",
4071 bs->node_name);
4072 goto out;
4073 }
4074
4075 if (bs->refcnt > 1) {
4076 error_setg(errp, "Block device %s is in use",
4077 bdrv_get_device_or_node_name(bs));
4078 goto out;
4079 }
4080 }
4081
4082 if (blk) {
4083 monitor_remove_blk(blk);
4084 blk_unref(blk);
4085 } else {
4086 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4087 bdrv_unref(bs);
4088 }
4089
4090 out:
4091 aio_context_release(aio_context);
4092 }
4093
4094 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4095 {
4096 BlockJobInfoList *head = NULL, **p_next = &head;
4097 BlockDriverState *bs;
4098
4099 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
4100 AioContext *aio_context = bdrv_get_aio_context(bs);
4101
4102 aio_context_acquire(aio_context);
4103
4104 if (bs->job) {
4105 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
4106 elem->value = block_job_query(bs->job);
4107 *p_next = elem;
4108 p_next = &elem->next;
4109 }
4110
4111 aio_context_release(aio_context);
4112 }
4113
4114 return head;
4115 }
4116
4117 QemuOptsList qemu_common_drive_opts = {
4118 .name = "drive",
4119 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4120 .desc = {
4121 {
4122 .name = "snapshot",
4123 .type = QEMU_OPT_BOOL,
4124 .help = "enable/disable snapshot mode",
4125 },{
4126 .name = "discard",
4127 .type = QEMU_OPT_STRING,
4128 .help = "discard operation (ignore/off, unmap/on)",
4129 },{
4130 .name = "aio",
4131 .type = QEMU_OPT_STRING,
4132 .help = "host AIO implementation (threads, native)",
4133 },{
4134 .name = "format",
4135 .type = QEMU_OPT_STRING,
4136 .help = "disk format (raw, qcow2, ...)",
4137 },{
4138 .name = "rerror",
4139 .type = QEMU_OPT_STRING,
4140 .help = "read error action",
4141 },{
4142 .name = "werror",
4143 .type = QEMU_OPT_STRING,
4144 .help = "write error action",
4145 },{
4146 .name = "read-only",
4147 .type = QEMU_OPT_BOOL,
4148 .help = "open drive file as read-only",
4149 },{
4150 .name = "throttling.iops-total",
4151 .type = QEMU_OPT_NUMBER,
4152 .help = "limit total I/O operations per second",
4153 },{
4154 .name = "throttling.iops-read",
4155 .type = QEMU_OPT_NUMBER,
4156 .help = "limit read operations per second",
4157 },{
4158 .name = "throttling.iops-write",
4159 .type = QEMU_OPT_NUMBER,
4160 .help = "limit write operations per second",
4161 },{
4162 .name = "throttling.bps-total",
4163 .type = QEMU_OPT_NUMBER,
4164 .help = "limit total bytes per second",
4165 },{
4166 .name = "throttling.bps-read",
4167 .type = QEMU_OPT_NUMBER,
4168 .help = "limit read bytes per second",
4169 },{
4170 .name = "throttling.bps-write",
4171 .type = QEMU_OPT_NUMBER,
4172 .help = "limit write bytes per second",
4173 },{
4174 .name = "throttling.iops-total-max",
4175 .type = QEMU_OPT_NUMBER,
4176 .help = "I/O operations burst",
4177 },{
4178 .name = "throttling.iops-read-max",
4179 .type = QEMU_OPT_NUMBER,
4180 .help = "I/O operations read burst",
4181 },{
4182 .name = "throttling.iops-write-max",
4183 .type = QEMU_OPT_NUMBER,
4184 .help = "I/O operations write burst",
4185 },{
4186 .name = "throttling.bps-total-max",
4187 .type = QEMU_OPT_NUMBER,
4188 .help = "total bytes burst",
4189 },{
4190 .name = "throttling.bps-read-max",
4191 .type = QEMU_OPT_NUMBER,
4192 .help = "total bytes read burst",
4193 },{
4194 .name = "throttling.bps-write-max",
4195 .type = QEMU_OPT_NUMBER,
4196 .help = "total bytes write burst",
4197 },{
4198 .name = "throttling.iops-total-max-length",
4199 .type = QEMU_OPT_NUMBER,
4200 .help = "length of the iops-total-max burst period, in seconds",
4201 },{
4202 .name = "throttling.iops-read-max-length",
4203 .type = QEMU_OPT_NUMBER,
4204 .help = "length of the iops-read-max burst period, in seconds",
4205 },{
4206 .name = "throttling.iops-write-max-length",
4207 .type = QEMU_OPT_NUMBER,
4208 .help = "length of the iops-write-max burst period, in seconds",
4209 },{
4210 .name = "throttling.bps-total-max-length",
4211 .type = QEMU_OPT_NUMBER,
4212 .help = "length of the bps-total-max burst period, in seconds",
4213 },{
4214 .name = "throttling.bps-read-max-length",
4215 .type = QEMU_OPT_NUMBER,
4216 .help = "length of the bps-read-max burst period, in seconds",
4217 },{
4218 .name = "throttling.bps-write-max-length",
4219 .type = QEMU_OPT_NUMBER,
4220 .help = "length of the bps-write-max burst period, in seconds",
4221 },{
4222 .name = "throttling.iops-size",
4223 .type = QEMU_OPT_NUMBER,
4224 .help = "when limiting by iops max size of an I/O in bytes",
4225 },{
4226 .name = "throttling.group",
4227 .type = QEMU_OPT_STRING,
4228 .help = "name of the block throttling group",
4229 },{
4230 .name = "copy-on-read",
4231 .type = QEMU_OPT_BOOL,
4232 .help = "copy read data from backing file into image file",
4233 },{
4234 .name = "detect-zeroes",
4235 .type = QEMU_OPT_STRING,
4236 .help = "try to optimize zero writes (off, on, unmap)",
4237 },{
4238 .name = "stats-account-invalid",
4239 .type = QEMU_OPT_BOOL,
4240 .help = "whether to account for invalid I/O operations "
4241 "in the statistics",
4242 },{
4243 .name = "stats-account-failed",
4244 .type = QEMU_OPT_BOOL,
4245 .help = "whether to account for failed I/O operations "
4246 "in the statistics",
4247 },
4248 { /* end of list */ }
4249 },
4250 };
4251
4252 static QemuOptsList qemu_root_bds_opts = {
4253 .name = "root-bds",
4254 .head = QTAILQ_HEAD_INITIALIZER(qemu_root_bds_opts.head),
4255 .desc = {
4256 {
4257 .name = "discard",
4258 .type = QEMU_OPT_STRING,
4259 .help = "discard operation (ignore/off, unmap/on)",
4260 },{
4261 .name = "aio",
4262 .type = QEMU_OPT_STRING,
4263 .help = "host AIO implementation (threads, native)",
4264 },{
4265 .name = "read-only",
4266 .type = QEMU_OPT_BOOL,
4267 .help = "open drive file as read-only",
4268 },{
4269 .name = "copy-on-read",
4270 .type = QEMU_OPT_BOOL,
4271 .help = "copy read data from backing file into image file",
4272 },{
4273 .name = "detect-zeroes",
4274 .type = QEMU_OPT_STRING,
4275 .help = "try to optimize zero writes (off, on, unmap)",
4276 },
4277 { /* end of list */ }
4278 },
4279 };
4280
4281 QemuOptsList qemu_drive_opts = {
4282 .name = "drive",
4283 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4284 .desc = {
4285 /*
4286 * no elements => accept any params
4287 * validation will happen later
4288 */
4289 { /* end of list */ }
4290 },
4291 };
AR7 emulation for QEMU