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qcow2: try load bitmaps only once
[qemu/kevin.git] / blockdev.c
blobc31bf3d98db64110239c18b1b446f63250276b78
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "qemu/osdep.h"
34 #include "sysemu/block-backend.h"
35 #include "sysemu/blockdev.h"
36 #include "hw/block/block.h"
37 #include "block/blockjob.h"
38 #include "block/throttle-groups.h"
39 #include "monitor/monitor.h"
40 #include "qemu/error-report.h"
41 #include "qemu/option.h"
42 #include "qemu/config-file.h"
43 #include "qapi/qapi-commands-block.h"
44 #include "qapi/qapi-commands-transaction.h"
45 #include "qapi/qapi-visit-block-core.h"
46 #include "qapi/qmp/qdict.h"
47 #include "qapi/qmp/qnum.h"
48 #include "qapi/qmp/qstring.h"
49 #include "qapi/error.h"
50 #include "qapi/qmp/qerror.h"
51 #include "qapi/qmp/qlist.h"
52 #include "qapi/qobject-output-visitor.h"
53 #include "sysemu/sysemu.h"
54 #include "sysemu/iothread.h"
55 #include "block/block_int.h"
56 #include "block/trace.h"
57 #include "sysemu/arch_init.h"
58 #include "sysemu/qtest.h"
59 #include "qemu/cutils.h"
60 #include "qemu/help_option.h"
61 #include "qemu/throttle-options.h"
62
63 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
64 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
65
66 static int do_open_tray(const char *blk_name, const char *qdev_id,
67 bool force, Error **errp);
68 static void blockdev_remove_medium(bool has_device, const char *device,
69 bool has_id, const char *id, Error **errp);
70 static void blockdev_insert_medium(bool has_device, const char *device,
71 bool has_id, const char *id,
72 const char *node_name, Error **errp);
73
74 static const char *const if_name[IF_COUNT] = {
75 [IF_NONE] = "none",
76 [IF_IDE] = "ide",
77 [IF_SCSI] = "scsi",
78 [IF_FLOPPY] = "floppy",
79 [IF_PFLASH] = "pflash",
80 [IF_MTD] = "mtd",
81 [IF_SD] = "sd",
82 [IF_VIRTIO] = "virtio",
83 [IF_XEN] = "xen",
84 };
85
86 static int if_max_devs[IF_COUNT] = {
87 /*
88 * Do not change these numbers! They govern how drive option
89 * index maps to unit and bus. That mapping is ABI.
90 *
91 * All controllers used to implement if=T drives need to support
92 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
93 * Otherwise, some index values map to "impossible" bus, unit
94 * values.
95 *
96 * For instance, if you change [IF_SCSI] to 255, -drive
97 * if=scsi,index=12 no longer means bus=1,unit=5, but
98 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
99 * the drive can't be set up. Regression.
100 */
101 [IF_IDE] = 2,
102 [IF_SCSI] = 7,
103 };
104
105 /**
106 * Boards may call this to offer board-by-board overrides
107 * of the default, global values.
108 */
109 void override_max_devs(BlockInterfaceType type, int max_devs)
110 {
111 BlockBackend *blk;
112 DriveInfo *dinfo;
113
114 if (max_devs <= 0) {
115 return;
116 }
117
118 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
119 dinfo = blk_legacy_dinfo(blk);
120 if (dinfo->type == type) {
121 fprintf(stderr, "Cannot override units-per-bus property of"
122 " the %s interface, because a drive of that type has"
123 " already been added.\n", if_name[type]);
124 g_assert_not_reached();
125 }
126 }
127
128 if_max_devs[type] = max_devs;
129 }
130
131 /*
132 * We automatically delete the drive when a device using it gets
133 * unplugged. Questionable feature, but we can't just drop it.
134 * Device models call blockdev_mark_auto_del() to schedule the
135 * automatic deletion, and generic qdev code calls blockdev_auto_del()
136 * when deletion is actually safe.
137 */
138 void blockdev_mark_auto_del(BlockBackend *blk)
139 {
140 DriveInfo *dinfo = blk_legacy_dinfo(blk);
141 BlockDriverState *bs = blk_bs(blk);
142 AioContext *aio_context;
143
144 if (!dinfo) {
145 return;
146 }
147
148 if (bs) {
149 aio_context = bdrv_get_aio_context(bs);
150 aio_context_acquire(aio_context);
151
152 if (bs->job) {
153 block_job_cancel(bs->job, false);
154 }
155
156 aio_context_release(aio_context);
157 }
158
159 dinfo->auto_del = 1;
160 }
161
162 void blockdev_auto_del(BlockBackend *blk)
163 {
164 DriveInfo *dinfo = blk_legacy_dinfo(blk);
165
166 if (dinfo && dinfo->auto_del) {
167 monitor_remove_blk(blk);
168 blk_unref(blk);
169 }
170 }
171
172 /**
173 * Returns the current mapping of how many units per bus
174 * a particular interface can support.
175 *
176 * A positive integer indicates n units per bus.
177 * 0 implies the mapping has not been established.
178 * -1 indicates an invalid BlockInterfaceType was given.
179 */
180 int drive_get_max_devs(BlockInterfaceType type)
181 {
182 if (type >= IF_IDE && type < IF_COUNT) {
183 return if_max_devs[type];
184 }
185
186 return -1;
187 }
188
189 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
190 {
191 int max_devs = if_max_devs[type];
192 return max_devs ? index / max_devs : 0;
193 }
194
195 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
196 {
197 int max_devs = if_max_devs[type];
198 return max_devs ? index % max_devs : index;
199 }
200
201 QemuOpts *drive_def(const char *optstr)
202 {
203 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
204 }
205
206 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
207 const char *optstr)
208 {
209 QemuOpts *opts;
210
211 opts = drive_def(optstr);
212 if (!opts) {
213 return NULL;
214 }
215 if (type != IF_DEFAULT) {
216 qemu_opt_set(opts, "if", if_name[type], &error_abort);
217 }
218 if (index >= 0) {
219 qemu_opt_set_number(opts, "index", index, &error_abort);
220 }
221 if (file)
222 qemu_opt_set(opts, "file", file, &error_abort);
223 return opts;
224 }
225
226 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
227 {
228 BlockBackend *blk;
229 DriveInfo *dinfo;
230
231 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
232 dinfo = blk_legacy_dinfo(blk);
233 if (dinfo && dinfo->type == type
234 && dinfo->bus == bus && dinfo->unit == unit) {
235 return dinfo;
236 }
237 }
238
239 return NULL;
240 }
241
242 void drive_check_orphaned(void)
243 {
244 BlockBackend *blk;
245 DriveInfo *dinfo;
246 Location loc;
247 bool orphans = false;
248
249 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
250 dinfo = blk_legacy_dinfo(blk);
251 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
252 dinfo->type != IF_NONE) {
253 loc_push_none(&loc);
254 qemu_opts_loc_restore(dinfo->opts);
255 error_report("machine type does not support"
256 " if=%s,bus=%d,unit=%d",
257 if_name[dinfo->type], dinfo->bus, dinfo->unit);
258 loc_pop(&loc);
259 orphans = true;
260 }
261 }
262
263 if (orphans) {
264 exit(1);
265 }
266 }
267
268 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
269 {
270 return drive_get(type,
271 drive_index_to_bus_id(type, index),
272 drive_index_to_unit_id(type, index));
273 }
274
275 int drive_get_max_bus(BlockInterfaceType type)
276 {
277 int max_bus;
278 BlockBackend *blk;
279 DriveInfo *dinfo;
280
281 max_bus = -1;
282 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
283 dinfo = blk_legacy_dinfo(blk);
284 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
285 max_bus = dinfo->bus;
286 }
287 }
288 return max_bus;
289 }
290
291 /* Get a block device. This should only be used for single-drive devices
292 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
293 appropriate bus. */
294 DriveInfo *drive_get_next(BlockInterfaceType type)
295 {
296 static int next_block_unit[IF_COUNT];
297
298 return drive_get(type, 0, next_block_unit[type]++);
299 }
300
301 static void bdrv_format_print(void *opaque, const char *name)
302 {
303 error_printf(" %s", name);
304 }
305
306 typedef struct {
307 QEMUBH *bh;
308 BlockDriverState *bs;
309 } BDRVPutRefBH;
310
311 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
312 {
313 if (!strcmp(buf, "ignore")) {
314 return BLOCKDEV_ON_ERROR_IGNORE;
315 } else if (!is_read && !strcmp(buf, "enospc")) {
316 return BLOCKDEV_ON_ERROR_ENOSPC;
317 } else if (!strcmp(buf, "stop")) {
318 return BLOCKDEV_ON_ERROR_STOP;
319 } else if (!strcmp(buf, "report")) {
320 return BLOCKDEV_ON_ERROR_REPORT;
321 } else {
322 error_setg(errp, "'%s' invalid %s error action",
323 buf, is_read ? "read" : "write");
324 return -1;
325 }
326 }
327
328 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
329 Error **errp)
330 {
331 const QListEntry *entry;
332 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
333 switch (qobject_type(entry->value)) {
334
335 case QTYPE_QSTRING: {
336 unsigned long long length;
337 const char *str = qstring_get_str(qobject_to(QString,
338 entry->value));
339 if (parse_uint_full(str, &length, 10) == 0 &&
340 length > 0 && length <= UINT_MAX) {
341 block_acct_add_interval(stats, (unsigned) length);
342 } else {
343 error_setg(errp, "Invalid interval length: %s", str);
344 return false;
345 }
346 break;
347 }
348
349 case QTYPE_QNUM: {
350 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
351
352 if (length > 0 && length <= UINT_MAX) {
353 block_acct_add_interval(stats, (unsigned) length);
354 } else {
355 error_setg(errp, "Invalid interval length: %" PRId64, length);
356 return false;
357 }
358 break;
359 }
360
361 default:
362 error_setg(errp, "The specification of stats-intervals is invalid");
363 return false;
364 }
365 }
366 return true;
367 }
368
369 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
370
371 /* All parameters but @opts are optional and may be set to NULL. */
372 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
373 const char **throttling_group, ThrottleConfig *throttle_cfg,
374 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
375 {
376 Error *local_error = NULL;
377 const char *aio;
378
379 if (bdrv_flags) {
380 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
381 *bdrv_flags |= BDRV_O_COPY_ON_READ;
382 }
383
384 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
385 if (!strcmp(aio, "native")) {
386 *bdrv_flags |= BDRV_O_NATIVE_AIO;
387 } else if (!strcmp(aio, "threads")) {
388 /* this is the default */
389 } else {
390 error_setg(errp, "invalid aio option");
391 return;
392 }
393 }
394 }
395
396 /* disk I/O throttling */
397 if (throttling_group) {
398 *throttling_group = qemu_opt_get(opts, "throttling.group");
399 }
400
401 if (throttle_cfg) {
402 throttle_config_init(throttle_cfg);
403 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
404 qemu_opt_get_number(opts, "throttling.bps-total", 0);
405 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
406 qemu_opt_get_number(opts, "throttling.bps-read", 0);
407 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
408 qemu_opt_get_number(opts, "throttling.bps-write", 0);
409 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
410 qemu_opt_get_number(opts, "throttling.iops-total", 0);
411 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
412 qemu_opt_get_number(opts, "throttling.iops-read", 0);
413 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
414 qemu_opt_get_number(opts, "throttling.iops-write", 0);
415
416 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
417 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
418 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
419 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
420 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
421 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
422 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
423 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
424 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
425 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
426 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
427 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
428
429 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
430 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
431 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
432 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
433 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
434 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
435 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
436 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
437 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
438 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
439 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
440 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
441
442 throttle_cfg->op_size =
443 qemu_opt_get_number(opts, "throttling.iops-size", 0);
444
445 if (!throttle_is_valid(throttle_cfg, errp)) {
446 return;
447 }
448 }
449
450 if (detect_zeroes) {
451 *detect_zeroes =
452 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
453 qemu_opt_get(opts, "detect-zeroes"),
454 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
455 &local_error);
456 if (local_error) {
457 error_propagate(errp, local_error);
458 return;
459 }
460 }
461 }
462
463 /* Takes the ownership of bs_opts */
464 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
465 Error **errp)
466 {
467 const char *buf;
468 int bdrv_flags = 0;
469 int on_read_error, on_write_error;
470 bool account_invalid, account_failed;
471 bool writethrough, read_only;
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 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
511
512 id = qemu_opts_id(opts);
513
514 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
515 qdict_array_split(interval_dict, &interval_list);
516
517 if (qdict_size(interval_dict) != 0) {
518 error_setg(errp, "Invalid option stats-intervals.%s",
519 qdict_first(interval_dict)->key);
520 goto early_err;
521 }
522
523 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
524 &detect_zeroes, &error);
525 if (error) {
526 error_propagate(errp, error);
527 goto early_err;
528 }
529
530 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
531 if (is_help_option(buf)) {
532 error_printf("Supported formats:");
533 bdrv_iterate_format(bdrv_format_print, NULL);
534 error_printf("\n");
535 goto early_err;
536 }
537
538 if (qdict_haskey(bs_opts, "driver")) {
539 error_setg(errp, "Cannot specify both 'driver' and 'format'");
540 goto early_err;
541 }
542 qdict_put_str(bs_opts, "driver", buf);
543 }
544
545 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
546 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
547 on_write_error = parse_block_error_action(buf, 0, &error);
548 if (error) {
549 error_propagate(errp, error);
550 goto early_err;
551 }
552 }
553
554 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
555 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
556 on_read_error = parse_block_error_action(buf, 1, &error);
557 if (error) {
558 error_propagate(errp, error);
559 goto early_err;
560 }
561 }
562
563 if (snapshot) {
564 bdrv_flags |= BDRV_O_SNAPSHOT;
565 }
566
567 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
568
569 /* init */
570 if ((!file || !*file) && !qdict_size(bs_opts)) {
571 BlockBackendRootState *blk_rs;
572
573 blk = blk_new(0, BLK_PERM_ALL);
574 blk_rs = blk_get_root_state(blk);
575 blk_rs->open_flags = bdrv_flags;
576 blk_rs->read_only = read_only;
577 blk_rs->detect_zeroes = detect_zeroes;
578
579 QDECREF(bs_opts);
580 } else {
581 if (file && !*file) {
582 file = NULL;
583 }
584
585 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
586 * with other callers) rather than what we want as the real defaults.
587 * Apply the defaults here instead. */
588 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
589 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
590 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
591 read_only ? "on" : "off");
592 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
593
594 if (runstate_check(RUN_STATE_INMIGRATE)) {
595 bdrv_flags |= BDRV_O_INACTIVE;
596 }
597
598 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
599 if (!blk) {
600 goto err_no_bs_opts;
601 }
602 bs = blk_bs(blk);
603
604 bs->detect_zeroes = detect_zeroes;
605
606 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
607
608 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
609 blk_unref(blk);
610 blk = NULL;
611 goto err_no_bs_opts;
612 }
613 }
614
615 /* disk I/O throttling */
616 if (throttle_enabled(&cfg)) {
617 if (!throttling_group) {
618 throttling_group = id;
619 }
620 blk_io_limits_enable(blk, throttling_group);
621 blk_set_io_limits(blk, &cfg);
622 }
623
624 blk_set_enable_write_cache(blk, !writethrough);
625 blk_set_on_error(blk, on_read_error, on_write_error);
626
627 if (!monitor_add_blk(blk, id, errp)) {
628 blk_unref(blk);
629 blk = NULL;
630 goto err_no_bs_opts;
631 }
632
633 err_no_bs_opts:
634 qemu_opts_del(opts);
635 QDECREF(interval_dict);
636 QDECREF(interval_list);
637 return blk;
638
639 early_err:
640 qemu_opts_del(opts);
641 QDECREF(interval_dict);
642 QDECREF(interval_list);
643 err_no_opts:
644 QDECREF(bs_opts);
645 return NULL;
646 }
647
648 /* Takes the ownership of bs_opts */
649 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
650 {
651 int bdrv_flags = 0;
652
653 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
654 * with other callers) rather than what we want as the real defaults.
655 * Apply the defaults here instead. */
656 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
657 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
658 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
659
660 if (runstate_check(RUN_STATE_INMIGRATE)) {
661 bdrv_flags |= BDRV_O_INACTIVE;
662 }
663
664 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
665 }
666
667 void blockdev_close_all_bdrv_states(void)
668 {
669 BlockDriverState *bs, *next_bs;
670
671 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
672 AioContext *ctx = bdrv_get_aio_context(bs);
673
674 aio_context_acquire(ctx);
675 bdrv_unref(bs);
676 aio_context_release(ctx);
677 }
678 }
679
680 /* Iterates over the list of monitor-owned BlockDriverStates */
681 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
682 {
683 return bs ? QTAILQ_NEXT(bs, monitor_list)
684 : QTAILQ_FIRST(&monitor_bdrv_states);
685 }
686
687 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
688 Error **errp)
689 {
690 const char *value;
691
692 value = qemu_opt_get(opts, from);
693 if (value) {
694 if (qemu_opt_find(opts, to)) {
695 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
696 "same time", to, from);
697 return;
698 }
699 }
700
701 /* rename all items in opts */
702 while ((value = qemu_opt_get(opts, from))) {
703 qemu_opt_set(opts, to, value, &error_abort);
704 qemu_opt_unset(opts, from);
705 }
706 }
707
708 QemuOptsList qemu_legacy_drive_opts = {
709 .name = "drive",
710 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
711 .desc = {
712 {
713 .name = "bus",
714 .type = QEMU_OPT_NUMBER,
715 .help = "bus number",
716 },{
717 .name = "unit",
718 .type = QEMU_OPT_NUMBER,
719 .help = "unit number (i.e. lun for scsi)",
720 },{
721 .name = "index",
722 .type = QEMU_OPT_NUMBER,
723 .help = "index number",
724 },{
725 .name = "media",
726 .type = QEMU_OPT_STRING,
727 .help = "media type (disk, cdrom)",
728 },{
729 .name = "if",
730 .type = QEMU_OPT_STRING,
731 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
732 },{
733 .name = "cyls",
734 .type = QEMU_OPT_NUMBER,
735 .help = "number of cylinders (ide disk geometry)",
736 },{
737 .name = "heads",
738 .type = QEMU_OPT_NUMBER,
739 .help = "number of heads (ide disk geometry)",
740 },{
741 .name = "secs",
742 .type = QEMU_OPT_NUMBER,
743 .help = "number of sectors (ide disk geometry)",
744 },{
745 .name = "trans",
746 .type = QEMU_OPT_STRING,
747 .help = "chs translation (auto, lba, none)",
748 },{
749 .name = "addr",
750 .type = QEMU_OPT_STRING,
751 .help = "pci address (virtio only)",
752 },{
753 .name = "serial",
754 .type = QEMU_OPT_STRING,
755 .help = "disk serial number",
756 },{
757 .name = "file",
758 .type = QEMU_OPT_STRING,
759 .help = "file name",
760 },
761
762 /* Options that are passed on, but have special semantics with -drive */
763 {
764 .name = BDRV_OPT_READ_ONLY,
765 .type = QEMU_OPT_BOOL,
766 .help = "open drive file as read-only",
767 },{
768 .name = "rerror",
769 .type = QEMU_OPT_STRING,
770 .help = "read error action",
771 },{
772 .name = "werror",
773 .type = QEMU_OPT_STRING,
774 .help = "write error action",
775 },{
776 .name = "copy-on-read",
777 .type = QEMU_OPT_BOOL,
778 .help = "copy read data from backing file into image file",
779 },
780
781 { /* end of list */ }
782 },
783 };
784
785 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
786 {
787 const char *value;
788 BlockBackend *blk;
789 DriveInfo *dinfo = NULL;
790 QDict *bs_opts;
791 QemuOpts *legacy_opts;
792 DriveMediaType media = MEDIA_DISK;
793 BlockInterfaceType type;
794 int cyls, heads, secs, translation;
795 int max_devs, bus_id, unit_id, index;
796 const char *devaddr;
797 const char *werror, *rerror;
798 bool read_only = false;
799 bool copy_on_read;
800 const char *serial;
801 const char *filename;
802 Error *local_err = NULL;
803 int i;
804 const char *deprecated[] = {
805 "serial", "trans", "secs", "heads", "cyls", "addr"
806 };
807
808 /* Change legacy command line options into QMP ones */
809 static const struct {
810 const char *from;
811 const char *to;
812 } opt_renames[] = {
813 { "iops", "throttling.iops-total" },
814 { "iops_rd", "throttling.iops-read" },
815 { "iops_wr", "throttling.iops-write" },
816
817 { "bps", "throttling.bps-total" },
818 { "bps_rd", "throttling.bps-read" },
819 { "bps_wr", "throttling.bps-write" },
820
821 { "iops_max", "throttling.iops-total-max" },
822 { "iops_rd_max", "throttling.iops-read-max" },
823 { "iops_wr_max", "throttling.iops-write-max" },
824
825 { "bps_max", "throttling.bps-total-max" },
826 { "bps_rd_max", "throttling.bps-read-max" },
827 { "bps_wr_max", "throttling.bps-write-max" },
828
829 { "iops_size", "throttling.iops-size" },
830
831 { "group", "throttling.group" },
832
833 { "readonly", BDRV_OPT_READ_ONLY },
834 };
835
836 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
837 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
838 &local_err);
839 if (local_err) {
840 error_report_err(local_err);
841 return NULL;
842 }
843 }
844
845 value = qemu_opt_get(all_opts, "cache");
846 if (value) {
847 int flags = 0;
848 bool writethrough;
849
850 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
851 error_report("invalid cache option");
852 return NULL;
853 }
854
855 /* Specific options take precedence */
856 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
857 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
858 !writethrough, &error_abort);
859 }
860 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
861 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
862 !!(flags & BDRV_O_NOCACHE), &error_abort);
863 }
864 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
865 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
866 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
867 }
868 qemu_opt_unset(all_opts, "cache");
869 }
870
871 /* Get a QDict for processing the options */
872 bs_opts = qdict_new();
873 qemu_opts_to_qdict(all_opts, bs_opts);
874
875 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
876 &error_abort);
877 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
878 if (local_err) {
879 error_report_err(local_err);
880 goto fail;
881 }
882
883 /* Other deprecated options */
884 if (!qtest_enabled()) {
885 for (i = 0; i < ARRAY_SIZE(deprecated); i++) {
886 if (qemu_opt_get(legacy_opts, deprecated[i]) != NULL) {
887 error_report("'%s' is deprecated, please use the corresponding "
888 "option of '-device' instead", deprecated[i]);
889 }
890 }
891 }
892
893 /* Media type */
894 value = qemu_opt_get(legacy_opts, "media");
895 if (value) {
896 if (!strcmp(value, "disk")) {
897 media = MEDIA_DISK;
898 } else if (!strcmp(value, "cdrom")) {
899 media = MEDIA_CDROM;
900 read_only = true;
901 } else {
902 error_report("'%s' invalid media", value);
903 goto fail;
904 }
905 }
906
907 /* copy-on-read is disabled with a warning for read-only devices */
908 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
909 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
910
911 if (read_only && copy_on_read) {
912 warn_report("disabling copy-on-read on read-only drive");
913 copy_on_read = false;
914 }
915
916 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
917 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
918
919 /* Controller type */
920 value = qemu_opt_get(legacy_opts, "if");
921 if (value) {
922 for (type = 0;
923 type < IF_COUNT && strcmp(value, if_name[type]);
924 type++) {
925 }
926 if (type == IF_COUNT) {
927 error_report("unsupported bus type '%s'", value);
928 goto fail;
929 }
930 } else {
931 type = block_default_type;
932 }
933
934 /* Geometry */
935 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
936 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
937 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
938
939 if (cyls || heads || secs) {
940 if (cyls < 1) {
941 error_report("invalid physical cyls number");
942 goto fail;
943 }
944 if (heads < 1) {
945 error_report("invalid physical heads number");
946 goto fail;
947 }
948 if (secs < 1) {
949 error_report("invalid physical secs number");
950 goto fail;
951 }
952 }
953
954 translation = BIOS_ATA_TRANSLATION_AUTO;
955 value = qemu_opt_get(legacy_opts, "trans");
956 if (value != NULL) {
957 if (!cyls) {
958 error_report("'%s' trans must be used with cyls, heads and secs",
959 value);
960 goto fail;
961 }
962 if (!strcmp(value, "none")) {
963 translation = BIOS_ATA_TRANSLATION_NONE;
964 } else if (!strcmp(value, "lba")) {
965 translation = BIOS_ATA_TRANSLATION_LBA;
966 } else if (!strcmp(value, "large")) {
967 translation = BIOS_ATA_TRANSLATION_LARGE;
968 } else if (!strcmp(value, "rechs")) {
969 translation = BIOS_ATA_TRANSLATION_RECHS;
970 } else if (!strcmp(value, "auto")) {
971 translation = BIOS_ATA_TRANSLATION_AUTO;
972 } else {
973 error_report("'%s' invalid translation type", value);
974 goto fail;
975 }
976 }
977
978 if (media == MEDIA_CDROM) {
979 if (cyls || secs || heads) {
980 error_report("CHS can't be set with media=cdrom");
981 goto fail;
982 }
983 }
984
985 /* Device address specified by bus/unit or index.
986 * If none was specified, try to find the first free one. */
987 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
988 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
989 index = qemu_opt_get_number(legacy_opts, "index", -1);
990
991 max_devs = if_max_devs[type];
992
993 if (index != -1) {
994 if (bus_id != 0 || unit_id != -1) {
995 error_report("index cannot be used with bus and unit");
996 goto fail;
997 }
998 bus_id = drive_index_to_bus_id(type, index);
999 unit_id = drive_index_to_unit_id(type, index);
1000 }
1001
1002 if (unit_id == -1) {
1003 unit_id = 0;
1004 while (drive_get(type, bus_id, unit_id) != NULL) {
1005 unit_id++;
1006 if (max_devs && unit_id >= max_devs) {
1007 unit_id -= max_devs;
1008 bus_id++;
1009 }
1010 }
1011 }
1012
1013 if (max_devs && unit_id >= max_devs) {
1014 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1015 goto fail;
1016 }
1017
1018 if (drive_get(type, bus_id, unit_id) != NULL) {
1019 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1020 bus_id, unit_id, index);
1021 goto fail;
1022 }
1023
1024 /* Serial number */
1025 serial = qemu_opt_get(legacy_opts, "serial");
1026
1027 /* no id supplied -> create one */
1028 if (qemu_opts_id(all_opts) == NULL) {
1029 char *new_id;
1030 const char *mediastr = "";
1031 if (type == IF_IDE || type == IF_SCSI) {
1032 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1033 }
1034 if (max_devs) {
1035 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1036 mediastr, unit_id);
1037 } else {
1038 new_id = g_strdup_printf("%s%s%i", if_name[type],
1039 mediastr, unit_id);
1040 }
1041 qdict_put_str(bs_opts, "id", new_id);
1042 g_free(new_id);
1043 }
1044
1045 /* Add virtio block device */
1046 devaddr = qemu_opt_get(legacy_opts, "addr");
1047 if (devaddr && type != IF_VIRTIO) {
1048 error_report("addr is not supported by this bus type");
1049 goto fail;
1050 }
1051
1052 if (type == IF_VIRTIO) {
1053 QemuOpts *devopts;
1054 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1055 &error_abort);
1056 if (arch_type == QEMU_ARCH_S390X) {
1057 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1058 } else {
1059 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1060 }
1061 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1062 &error_abort);
1063 if (devaddr) {
1064 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1065 }
1066 }
1067
1068 filename = qemu_opt_get(legacy_opts, "file");
1069
1070 /* Check werror/rerror compatibility with if=... */
1071 werror = qemu_opt_get(legacy_opts, "werror");
1072 if (werror != NULL) {
1073 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1074 type != IF_NONE) {
1075 error_report("werror is not supported by this bus type");
1076 goto fail;
1077 }
1078 qdict_put_str(bs_opts, "werror", werror);
1079 }
1080
1081 rerror = qemu_opt_get(legacy_opts, "rerror");
1082 if (rerror != NULL) {
1083 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1084 type != IF_NONE) {
1085 error_report("rerror is not supported by this bus type");
1086 goto fail;
1087 }
1088 qdict_put_str(bs_opts, "rerror", rerror);
1089 }
1090
1091 /* Actual block device init: Functionality shared with blockdev-add */
1092 blk = blockdev_init(filename, bs_opts, &local_err);
1093 bs_opts = NULL;
1094 if (!blk) {
1095 if (local_err) {
1096 error_report_err(local_err);
1097 }
1098 goto fail;
1099 } else {
1100 assert(!local_err);
1101 }
1102
1103 /* Create legacy DriveInfo */
1104 dinfo = g_malloc0(sizeof(*dinfo));
1105 dinfo->opts = all_opts;
1106
1107 dinfo->cyls = cyls;
1108 dinfo->heads = heads;
1109 dinfo->secs = secs;
1110 dinfo->trans = translation;
1111
1112 dinfo->type = type;
1113 dinfo->bus = bus_id;
1114 dinfo->unit = unit_id;
1115 dinfo->devaddr = devaddr;
1116 dinfo->serial = g_strdup(serial);
1117
1118 blk_set_legacy_dinfo(blk, dinfo);
1119
1120 switch(type) {
1121 case IF_IDE:
1122 case IF_SCSI:
1123 case IF_XEN:
1124 case IF_NONE:
1125 dinfo->media_cd = media == MEDIA_CDROM;
1126 break;
1127 default:
1128 break;
1129 }
1130
1131 fail:
1132 qemu_opts_del(legacy_opts);
1133 QDECREF(bs_opts);
1134 return dinfo;
1135 }
1136
1137 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1138 {
1139 BlockDriverState *bs;
1140
1141 bs = bdrv_lookup_bs(name, name, errp);
1142 if (bs == NULL) {
1143 return NULL;
1144 }
1145
1146 if (!bdrv_is_root_node(bs)) {
1147 error_setg(errp, "Need a root block node");
1148 return NULL;
1149 }
1150
1151 if (!bdrv_is_inserted(bs)) {
1152 error_setg(errp, "Device has no medium");
1153 return NULL;
1154 }
1155
1156 return bs;
1157 }
1158
1159 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id,
1160 Error **errp)
1161 {
1162 BlockBackend *blk;
1163
1164 if (!blk_name == !qdev_id) {
1165 error_setg(errp, "Need exactly one of 'device' and 'id'");
1166 return NULL;
1167 }
1168
1169 if (qdev_id) {
1170 blk = blk_by_qdev_id(qdev_id, errp);
1171 } else {
1172 blk = blk_by_name(blk_name);
1173 if (blk == NULL) {
1174 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1175 "Device '%s' not found", blk_name);
1176 }
1177 }
1178
1179 return blk;
1180 }
1181
1182 void hmp_commit(Monitor *mon, const QDict *qdict)
1183 {
1184 const char *device = qdict_get_str(qdict, "device");
1185 BlockBackend *blk;
1186 int ret;
1187
1188 if (!strcmp(device, "all")) {
1189 ret = blk_commit_all();
1190 } else {
1191 BlockDriverState *bs;
1192 AioContext *aio_context;
1193
1194 blk = blk_by_name(device);
1195 if (!blk) {
1196 monitor_printf(mon, "Device '%s' not found\n", device);
1197 return;
1198 }
1199 if (!blk_is_available(blk)) {
1200 monitor_printf(mon, "Device '%s' has no medium\n", device);
1201 return;
1202 }
1203
1204 bs = blk_bs(blk);
1205 aio_context = bdrv_get_aio_context(bs);
1206 aio_context_acquire(aio_context);
1207
1208 ret = bdrv_commit(bs);
1209
1210 aio_context_release(aio_context);
1211 }
1212 if (ret < 0) {
1213 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1214 strerror(-ret));
1215 }
1216 }
1217
1218 static void blockdev_do_action(TransactionAction *action, Error **errp)
1219 {
1220 TransactionActionList list;
1221
1222 list.value = action;
1223 list.next = NULL;
1224 qmp_transaction(&list, false, NULL, errp);
1225 }
1226
1227 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1228 bool has_node_name, const char *node_name,
1229 const char *snapshot_file,
1230 bool has_snapshot_node_name,
1231 const char *snapshot_node_name,
1232 bool has_format, const char *format,
1233 bool has_mode, NewImageMode mode, Error **errp)
1234 {
1235 BlockdevSnapshotSync snapshot = {
1236 .has_device = has_device,
1237 .device = (char *) device,
1238 .has_node_name = has_node_name,
1239 .node_name = (char *) node_name,
1240 .snapshot_file = (char *) snapshot_file,
1241 .has_snapshot_node_name = has_snapshot_node_name,
1242 .snapshot_node_name = (char *) snapshot_node_name,
1243 .has_format = has_format,
1244 .format = (char *) format,
1245 .has_mode = has_mode,
1246 .mode = mode,
1247 };
1248 TransactionAction action = {
1249 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1250 .u.blockdev_snapshot_sync.data = &snapshot,
1251 };
1252 blockdev_do_action(&action, errp);
1253 }
1254
1255 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1256 Error **errp)
1257 {
1258 BlockdevSnapshot snapshot_data = {
1259 .node = (char *) node,
1260 .overlay = (char *) overlay
1261 };
1262 TransactionAction action = {
1263 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1264 .u.blockdev_snapshot.data = &snapshot_data,
1265 };
1266 blockdev_do_action(&action, errp);
1267 }
1268
1269 void qmp_blockdev_snapshot_internal_sync(const char *device,
1270 const char *name,
1271 Error **errp)
1272 {
1273 BlockdevSnapshotInternal snapshot = {
1274 .device = (char *) device,
1275 .name = (char *) name
1276 };
1277 TransactionAction action = {
1278 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1279 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1280 };
1281 blockdev_do_action(&action, errp);
1282 }
1283
1284 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1285 bool has_id,
1286 const char *id,
1287 bool has_name,
1288 const char *name,
1289 Error **errp)
1290 {
1291 BlockDriverState *bs;
1292 AioContext *aio_context;
1293 QEMUSnapshotInfo sn;
1294 Error *local_err = NULL;
1295 SnapshotInfo *info = NULL;
1296 int ret;
1297
1298 bs = qmp_get_root_bs(device, errp);
1299 if (!bs) {
1300 return NULL;
1301 }
1302 aio_context = bdrv_get_aio_context(bs);
1303 aio_context_acquire(aio_context);
1304
1305 if (!has_id) {
1306 id = NULL;
1307 }
1308
1309 if (!has_name) {
1310 name = NULL;
1311 }
1312
1313 if (!id && !name) {
1314 error_setg(errp, "Name or id must be provided");
1315 goto out_aio_context;
1316 }
1317
1318 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1319 goto out_aio_context;
1320 }
1321
1322 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1323 if (local_err) {
1324 error_propagate(errp, local_err);
1325 goto out_aio_context;
1326 }
1327 if (!ret) {
1328 error_setg(errp,
1329 "Snapshot with id '%s' and name '%s' does not exist on "
1330 "device '%s'",
1331 STR_OR_NULL(id), STR_OR_NULL(name), device);
1332 goto out_aio_context;
1333 }
1334
1335 bdrv_snapshot_delete(bs, id, name, &local_err);
1336 if (local_err) {
1337 error_propagate(errp, local_err);
1338 goto out_aio_context;
1339 }
1340
1341 aio_context_release(aio_context);
1342
1343 info = g_new0(SnapshotInfo, 1);
1344 info->id = g_strdup(sn.id_str);
1345 info->name = g_strdup(sn.name);
1346 info->date_nsec = sn.date_nsec;
1347 info->date_sec = sn.date_sec;
1348 info->vm_state_size = sn.vm_state_size;
1349 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1350 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1351
1352 return info;
1353
1354 out_aio_context:
1355 aio_context_release(aio_context);
1356 return NULL;
1357 }
1358
1359 /**
1360 * block_dirty_bitmap_lookup:
1361 * Return a dirty bitmap (if present), after validating
1362 * the node reference and bitmap names.
1363 *
1364 * @node: The name of the BDS node to search for bitmaps
1365 * @name: The name of the bitmap to search for
1366 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1367 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1368 * @errp: Output pointer for error information. Can be NULL.
1369 *
1370 * @return: A bitmap object on success, or NULL on failure.
1371 */
1372 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1373 const char *name,
1374 BlockDriverState **pbs,
1375 Error **errp)
1376 {
1377 BlockDriverState *bs;
1378 BdrvDirtyBitmap *bitmap;
1379
1380 if (!node) {
1381 error_setg(errp, "Node cannot be NULL");
1382 return NULL;
1383 }
1384 if (!name) {
1385 error_setg(errp, "Bitmap name cannot be NULL");
1386 return NULL;
1387 }
1388 bs = bdrv_lookup_bs(node, node, NULL);
1389 if (!bs) {
1390 error_setg(errp, "Node '%s' not found", node);
1391 return NULL;
1392 }
1393
1394 bitmap = bdrv_find_dirty_bitmap(bs, name);
1395 if (!bitmap) {
1396 error_setg(errp, "Dirty bitmap '%s' not found", name);
1397 return NULL;
1398 }
1399
1400 if (pbs) {
1401 *pbs = bs;
1402 }
1403
1404 return bitmap;
1405 }
1406
1407 /* New and old BlockDriverState structs for atomic group operations */
1408
1409 typedef struct BlkActionState BlkActionState;
1410
1411 /**
1412 * BlkActionOps:
1413 * Table of operations that define an Action.
1414 *
1415 * @instance_size: Size of state struct, in bytes.
1416 * @prepare: Prepare the work, must NOT be NULL.
1417 * @commit: Commit the changes, can be NULL.
1418 * @abort: Abort the changes on fail, can be NULL.
1419 * @clean: Clean up resources after all transaction actions have called
1420 * commit() or abort(). Can be NULL.
1421 *
1422 * Only prepare() may fail. In a single transaction, only one of commit() or
1423 * abort() will be called. clean() will always be called if it is present.
1424 */
1425 typedef struct BlkActionOps {
1426 size_t instance_size;
1427 void (*prepare)(BlkActionState *common, Error **errp);
1428 void (*commit)(BlkActionState *common);
1429 void (*abort)(BlkActionState *common);
1430 void (*clean)(BlkActionState *common);
1431 } BlkActionOps;
1432
1433 /**
1434 * BlkActionState:
1435 * Describes one Action's state within a Transaction.
1436 *
1437 * @action: QAPI-defined enum identifying which Action to perform.
1438 * @ops: Table of ActionOps this Action can perform.
1439 * @block_job_txn: Transaction which this action belongs to.
1440 * @entry: List membership for all Actions in this Transaction.
1441 *
1442 * This structure must be arranged as first member in a subclassed type,
1443 * assuming that the compiler will also arrange it to the same offsets as the
1444 * base class.
1445 */
1446 struct BlkActionState {
1447 TransactionAction *action;
1448 const BlkActionOps *ops;
1449 BlockJobTxn *block_job_txn;
1450 TransactionProperties *txn_props;
1451 QSIMPLEQ_ENTRY(BlkActionState) entry;
1452 };
1453
1454 /* internal snapshot private data */
1455 typedef struct InternalSnapshotState {
1456 BlkActionState common;
1457 BlockDriverState *bs;
1458 QEMUSnapshotInfo sn;
1459 bool created;
1460 } InternalSnapshotState;
1461
1462
1463 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1464 {
1465 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1466 error_setg(errp,
1467 "Action '%s' does not support Transaction property "
1468 "completion-mode = %s",
1469 TransactionActionKind_str(s->action->type),
1470 ActionCompletionMode_str(s->txn_props->completion_mode));
1471 return -1;
1472 }
1473 return 0;
1474 }
1475
1476 static void internal_snapshot_prepare(BlkActionState *common,
1477 Error **errp)
1478 {
1479 Error *local_err = NULL;
1480 const char *device;
1481 const char *name;
1482 BlockDriverState *bs;
1483 QEMUSnapshotInfo old_sn, *sn;
1484 bool ret;
1485 qemu_timeval tv;
1486 BlockdevSnapshotInternal *internal;
1487 InternalSnapshotState *state;
1488 AioContext *aio_context;
1489 int ret1;
1490
1491 g_assert(common->action->type ==
1492 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1493 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1494 state = DO_UPCAST(InternalSnapshotState, common, common);
1495
1496 /* 1. parse input */
1497 device = internal->device;
1498 name = internal->name;
1499
1500 /* 2. check for validation */
1501 if (action_check_completion_mode(common, errp) < 0) {
1502 return;
1503 }
1504
1505 bs = qmp_get_root_bs(device, errp);
1506 if (!bs) {
1507 return;
1508 }
1509
1510 aio_context = bdrv_get_aio_context(bs);
1511 aio_context_acquire(aio_context);
1512
1513 state->bs = bs;
1514
1515 /* Paired with .clean() */
1516 bdrv_drained_begin(bs);
1517
1518 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1519 goto out;
1520 }
1521
1522 if (bdrv_is_read_only(bs)) {
1523 error_setg(errp, "Device '%s' is read only", device);
1524 goto out;
1525 }
1526
1527 if (!bdrv_can_snapshot(bs)) {
1528 error_setg(errp, "Block format '%s' used by device '%s' "
1529 "does not support internal snapshots",
1530 bs->drv->format_name, device);
1531 goto out;
1532 }
1533
1534 if (!strlen(name)) {
1535 error_setg(errp, "Name is empty");
1536 goto out;
1537 }
1538
1539 /* check whether a snapshot with name exist */
1540 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1541 &local_err);
1542 if (local_err) {
1543 error_propagate(errp, local_err);
1544 goto out;
1545 } else if (ret) {
1546 error_setg(errp,
1547 "Snapshot with name '%s' already exists on device '%s'",
1548 name, device);
1549 goto out;
1550 }
1551
1552 /* 3. take the snapshot */
1553 sn = &state->sn;
1554 pstrcpy(sn->name, sizeof(sn->name), name);
1555 qemu_gettimeofday(&tv);
1556 sn->date_sec = tv.tv_sec;
1557 sn->date_nsec = tv.tv_usec * 1000;
1558 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1559
1560 ret1 = bdrv_snapshot_create(bs, sn);
1561 if (ret1 < 0) {
1562 error_setg_errno(errp, -ret1,
1563 "Failed to create snapshot '%s' on device '%s'",
1564 name, device);
1565 goto out;
1566 }
1567
1568 /* 4. succeed, mark a snapshot is created */
1569 state->created = true;
1570
1571 out:
1572 aio_context_release(aio_context);
1573 }
1574
1575 static void internal_snapshot_abort(BlkActionState *common)
1576 {
1577 InternalSnapshotState *state =
1578 DO_UPCAST(InternalSnapshotState, common, common);
1579 BlockDriverState *bs = state->bs;
1580 QEMUSnapshotInfo *sn = &state->sn;
1581 AioContext *aio_context;
1582 Error *local_error = NULL;
1583
1584 if (!state->created) {
1585 return;
1586 }
1587
1588 aio_context = bdrv_get_aio_context(state->bs);
1589 aio_context_acquire(aio_context);
1590
1591 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1592 error_reportf_err(local_error,
1593 "Failed to delete snapshot with id '%s' and "
1594 "name '%s' on device '%s' in abort: ",
1595 sn->id_str, sn->name,
1596 bdrv_get_device_name(bs));
1597 }
1598
1599 aio_context_release(aio_context);
1600 }
1601
1602 static void internal_snapshot_clean(BlkActionState *common)
1603 {
1604 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1605 common, common);
1606 AioContext *aio_context;
1607
1608 if (!state->bs) {
1609 return;
1610 }
1611
1612 aio_context = bdrv_get_aio_context(state->bs);
1613 aio_context_acquire(aio_context);
1614
1615 bdrv_drained_end(state->bs);
1616
1617 aio_context_release(aio_context);
1618 }
1619
1620 /* external snapshot private data */
1621 typedef struct ExternalSnapshotState {
1622 BlkActionState common;
1623 BlockDriverState *old_bs;
1624 BlockDriverState *new_bs;
1625 bool overlay_appended;
1626 } ExternalSnapshotState;
1627
1628 static void external_snapshot_prepare(BlkActionState *common,
1629 Error **errp)
1630 {
1631 int flags = 0;
1632 QDict *options = NULL;
1633 Error *local_err = NULL;
1634 /* Device and node name of the image to generate the snapshot from */
1635 const char *device;
1636 const char *node_name;
1637 /* Reference to the new image (for 'blockdev-snapshot') */
1638 const char *snapshot_ref;
1639 /* File name of the new image (for 'blockdev-snapshot-sync') */
1640 const char *new_image_file;
1641 ExternalSnapshotState *state =
1642 DO_UPCAST(ExternalSnapshotState, common, common);
1643 TransactionAction *action = common->action;
1644 AioContext *aio_context;
1645
1646 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1647 * purpose but a different set of parameters */
1648 switch (action->type) {
1649 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1650 {
1651 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1652 device = s->node;
1653 node_name = s->node;
1654 new_image_file = NULL;
1655 snapshot_ref = s->overlay;
1656 }
1657 break;
1658 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1659 {
1660 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1661 device = s->has_device ? s->device : NULL;
1662 node_name = s->has_node_name ? s->node_name : NULL;
1663 new_image_file = s->snapshot_file;
1664 snapshot_ref = NULL;
1665 }
1666 break;
1667 default:
1668 g_assert_not_reached();
1669 }
1670
1671 /* start processing */
1672 if (action_check_completion_mode(common, errp) < 0) {
1673 return;
1674 }
1675
1676 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1677 if (!state->old_bs) {
1678 return;
1679 }
1680
1681 aio_context = bdrv_get_aio_context(state->old_bs);
1682 aio_context_acquire(aio_context);
1683
1684 /* Paired with .clean() */
1685 bdrv_drained_begin(state->old_bs);
1686
1687 if (!bdrv_is_inserted(state->old_bs)) {
1688 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1689 goto out;
1690 }
1691
1692 if (bdrv_op_is_blocked(state->old_bs,
1693 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1694 goto out;
1695 }
1696
1697 if (!bdrv_is_read_only(state->old_bs)) {
1698 if (bdrv_flush(state->old_bs)) {
1699 error_setg(errp, QERR_IO_ERROR);
1700 goto out;
1701 }
1702 }
1703
1704 if (!bdrv_is_first_non_filter(state->old_bs)) {
1705 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1706 goto out;
1707 }
1708
1709 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1710 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1711 const char *format = s->has_format ? s->format : "qcow2";
1712 enum NewImageMode mode;
1713 const char *snapshot_node_name =
1714 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1715
1716 if (node_name && !snapshot_node_name) {
1717 error_setg(errp, "New snapshot node name missing");
1718 goto out;
1719 }
1720
1721 if (snapshot_node_name &&
1722 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1723 error_setg(errp, "New snapshot node name already in use");
1724 goto out;
1725 }
1726
1727 flags = state->old_bs->open_flags;
1728 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1729 flags |= BDRV_O_NO_BACKING;
1730
1731 /* create new image w/backing file */
1732 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1733 if (mode != NEW_IMAGE_MODE_EXISTING) {
1734 int64_t size = bdrv_getlength(state->old_bs);
1735 if (size < 0) {
1736 error_setg_errno(errp, -size, "bdrv_getlength failed");
1737 goto out;
1738 }
1739 bdrv_img_create(new_image_file, format,
1740 state->old_bs->filename,
1741 state->old_bs->drv->format_name,
1742 NULL, size, flags, false, &local_err);
1743 if (local_err) {
1744 error_propagate(errp, local_err);
1745 goto out;
1746 }
1747 }
1748
1749 options = qdict_new();
1750 if (s->has_snapshot_node_name) {
1751 qdict_put_str(options, "node-name", snapshot_node_name);
1752 }
1753 qdict_put_str(options, "driver", format);
1754 }
1755
1756 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1757 errp);
1758 /* We will manually add the backing_hd field to the bs later */
1759 if (!state->new_bs) {
1760 goto out;
1761 }
1762
1763 if (bdrv_has_blk(state->new_bs)) {
1764 error_setg(errp, "The snapshot is already in use");
1765 goto out;
1766 }
1767
1768 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1769 errp)) {
1770 goto out;
1771 }
1772
1773 if (state->new_bs->backing != NULL) {
1774 error_setg(errp, "The snapshot already has a backing image");
1775 goto out;
1776 }
1777
1778 if (!state->new_bs->drv->supports_backing) {
1779 error_setg(errp, "The snapshot does not support backing images");
1780 goto out;
1781 }
1782
1783 bdrv_set_aio_context(state->new_bs, aio_context);
1784
1785 /* This removes our old bs and adds the new bs. This is an operation that
1786 * can fail, so we need to do it in .prepare; undoing it for abort is
1787 * always possible. */
1788 bdrv_ref(state->new_bs);
1789 bdrv_append(state->new_bs, state->old_bs, &local_err);
1790 if (local_err) {
1791 error_propagate(errp, local_err);
1792 goto out;
1793 }
1794 state->overlay_appended = true;
1795
1796 out:
1797 aio_context_release(aio_context);
1798 }
1799
1800 static void external_snapshot_commit(BlkActionState *common)
1801 {
1802 ExternalSnapshotState *state =
1803 DO_UPCAST(ExternalSnapshotState, common, common);
1804 AioContext *aio_context;
1805
1806 aio_context = bdrv_get_aio_context(state->old_bs);
1807 aio_context_acquire(aio_context);
1808
1809 /* We don't need (or want) to use the transactional
1810 * bdrv_reopen_multiple() across all the entries at once, because we
1811 * don't want to abort all of them if one of them fails the reopen */
1812 if (!atomic_read(&state->old_bs->copy_on_read)) {
1813 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1814 NULL);
1815 }
1816
1817 aio_context_release(aio_context);
1818 }
1819
1820 static void external_snapshot_abort(BlkActionState *common)
1821 {
1822 ExternalSnapshotState *state =
1823 DO_UPCAST(ExternalSnapshotState, common, common);
1824 if (state->new_bs) {
1825 if (state->overlay_appended) {
1826 AioContext *aio_context;
1827
1828 aio_context = bdrv_get_aio_context(state->old_bs);
1829 aio_context_acquire(aio_context);
1830
1831 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1832 close state->old_bs; we need it */
1833 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1834 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1835 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1836
1837 aio_context_release(aio_context);
1838 }
1839 }
1840 }
1841
1842 static void external_snapshot_clean(BlkActionState *common)
1843 {
1844 ExternalSnapshotState *state =
1845 DO_UPCAST(ExternalSnapshotState, common, common);
1846 AioContext *aio_context;
1847
1848 if (!state->old_bs) {
1849 return;
1850 }
1851
1852 aio_context = bdrv_get_aio_context(state->old_bs);
1853 aio_context_acquire(aio_context);
1854
1855 bdrv_drained_end(state->old_bs);
1856 bdrv_unref(state->new_bs);
1857
1858 aio_context_release(aio_context);
1859 }
1860
1861 typedef struct DriveBackupState {
1862 BlkActionState common;
1863 BlockDriverState *bs;
1864 BlockJob *job;
1865 } DriveBackupState;
1866
1867 static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
1868 Error **errp);
1869
1870 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1871 {
1872 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1873 BlockDriverState *bs;
1874 DriveBackup *backup;
1875 AioContext *aio_context;
1876 Error *local_err = NULL;
1877
1878 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1879 backup = common->action->u.drive_backup.data;
1880
1881 bs = qmp_get_root_bs(backup->device, errp);
1882 if (!bs) {
1883 return;
1884 }
1885
1886 aio_context = bdrv_get_aio_context(bs);
1887 aio_context_acquire(aio_context);
1888
1889 /* Paired with .clean() */
1890 bdrv_drained_begin(bs);
1891
1892 state->bs = bs;
1893
1894 state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
1895 if (local_err) {
1896 error_propagate(errp, local_err);
1897 goto out;
1898 }
1899
1900 out:
1901 aio_context_release(aio_context);
1902 }
1903
1904 static void drive_backup_commit(BlkActionState *common)
1905 {
1906 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1907 AioContext *aio_context;
1908
1909 aio_context = bdrv_get_aio_context(state->bs);
1910 aio_context_acquire(aio_context);
1911
1912 assert(state->job);
1913 block_job_start(state->job);
1914
1915 aio_context_release(aio_context);
1916 }
1917
1918 static void drive_backup_abort(BlkActionState *common)
1919 {
1920 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1921
1922 if (state->job) {
1923 AioContext *aio_context;
1924
1925 aio_context = bdrv_get_aio_context(state->bs);
1926 aio_context_acquire(aio_context);
1927
1928 block_job_cancel_sync(state->job);
1929
1930 aio_context_release(aio_context);
1931 }
1932 }
1933
1934 static void drive_backup_clean(BlkActionState *common)
1935 {
1936 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1937 AioContext *aio_context;
1938
1939 if (!state->bs) {
1940 return;
1941 }
1942
1943 aio_context = bdrv_get_aio_context(state->bs);
1944 aio_context_acquire(aio_context);
1945
1946 bdrv_drained_end(state->bs);
1947
1948 aio_context_release(aio_context);
1949 }
1950
1951 typedef struct BlockdevBackupState {
1952 BlkActionState common;
1953 BlockDriverState *bs;
1954 BlockJob *job;
1955 } BlockdevBackupState;
1956
1957 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn,
1958 Error **errp);
1959
1960 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1961 {
1962 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1963 BlockdevBackup *backup;
1964 BlockDriverState *bs, *target;
1965 AioContext *aio_context;
1966 Error *local_err = NULL;
1967
1968 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1969 backup = common->action->u.blockdev_backup.data;
1970
1971 bs = qmp_get_root_bs(backup->device, errp);
1972 if (!bs) {
1973 return;
1974 }
1975
1976 target = bdrv_lookup_bs(backup->target, backup->target, errp);
1977 if (!target) {
1978 return;
1979 }
1980
1981 aio_context = bdrv_get_aio_context(bs);
1982 if (aio_context != bdrv_get_aio_context(target)) {
1983 error_setg(errp, "Backup between two IO threads is not implemented");
1984 return;
1985 }
1986 aio_context_acquire(aio_context);
1987 state->bs = bs;
1988
1989 /* Paired with .clean() */
1990 bdrv_drained_begin(state->bs);
1991
1992 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
1993 if (local_err) {
1994 error_propagate(errp, local_err);
1995 goto out;
1996 }
1997
1998 out:
1999 aio_context_release(aio_context);
2000 }
2001
2002 static void blockdev_backup_commit(BlkActionState *common)
2003 {
2004 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2005 AioContext *aio_context;
2006
2007 aio_context = bdrv_get_aio_context(state->bs);
2008 aio_context_acquire(aio_context);
2009
2010 assert(state->job);
2011 block_job_start(state->job);
2012
2013 aio_context_release(aio_context);
2014 }
2015
2016 static void blockdev_backup_abort(BlkActionState *common)
2017 {
2018 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2019
2020 if (state->job) {
2021 AioContext *aio_context;
2022
2023 aio_context = bdrv_get_aio_context(state->bs);
2024 aio_context_acquire(aio_context);
2025
2026 block_job_cancel_sync(state->job);
2027
2028 aio_context_release(aio_context);
2029 }
2030 }
2031
2032 static void blockdev_backup_clean(BlkActionState *common)
2033 {
2034 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2035 AioContext *aio_context;
2036
2037 if (!state->bs) {
2038 return;
2039 }
2040
2041 aio_context = bdrv_get_aio_context(state->bs);
2042 aio_context_acquire(aio_context);
2043
2044 bdrv_drained_end(state->bs);
2045
2046 aio_context_release(aio_context);
2047 }
2048
2049 typedef struct BlockDirtyBitmapState {
2050 BlkActionState common;
2051 BdrvDirtyBitmap *bitmap;
2052 BlockDriverState *bs;
2053 HBitmap *backup;
2054 bool prepared;
2055 } BlockDirtyBitmapState;
2056
2057 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2058 Error **errp)
2059 {
2060 Error *local_err = NULL;
2061 BlockDirtyBitmapAdd *action;
2062 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2063 common, common);
2064
2065 if (action_check_completion_mode(common, errp) < 0) {
2066 return;
2067 }
2068
2069 action = common->action->u.block_dirty_bitmap_add.data;
2070 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2071 qmp_block_dirty_bitmap_add(action->node, action->name,
2072 action->has_granularity, action->granularity,
2073 action->has_persistent, action->persistent,
2074 action->has_autoload, action->autoload,
2075 &local_err);
2076
2077 if (!local_err) {
2078 state->prepared = true;
2079 } else {
2080 error_propagate(errp, local_err);
2081 }
2082 }
2083
2084 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2085 {
2086 BlockDirtyBitmapAdd *action;
2087 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2088 common, common);
2089
2090 action = common->action->u.block_dirty_bitmap_add.data;
2091 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2092 * then the node reference and bitmap name must have been valid.
2093 */
2094 if (state->prepared) {
2095 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2096 }
2097 }
2098
2099 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2100 Error **errp)
2101 {
2102 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2103 common, common);
2104 BlockDirtyBitmap *action;
2105
2106 if (action_check_completion_mode(common, errp) < 0) {
2107 return;
2108 }
2109
2110 action = common->action->u.block_dirty_bitmap_clear.data;
2111 state->bitmap = block_dirty_bitmap_lookup(action->node,
2112 action->name,
2113 &state->bs,
2114 errp);
2115 if (!state->bitmap) {
2116 return;
2117 }
2118
2119 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2120 error_setg(errp, "Cannot modify a frozen bitmap");
2121 return;
2122 } else if (bdrv_dirty_bitmap_qmp_locked(state->bitmap)) {
2123 error_setg(errp, "Cannot modify a locked bitmap");
2124 return;
2125 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2126 error_setg(errp, "Cannot clear a disabled bitmap");
2127 return;
2128 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
2129 error_setg(errp, "Cannot clear a readonly bitmap");
2130 return;
2131 }
2132
2133 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2134 }
2135
2136 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2137 {
2138 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2139 common, common);
2140
2141 if (state->backup) {
2142 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2143 }
2144 }
2145
2146 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2147 {
2148 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2149 common, common);
2150
2151 hbitmap_free(state->backup);
2152 }
2153
2154 static void abort_prepare(BlkActionState *common, Error **errp)
2155 {
2156 error_setg(errp, "Transaction aborted using Abort action");
2157 }
2158
2159 static void abort_commit(BlkActionState *common)
2160 {
2161 g_assert_not_reached(); /* this action never succeeds */
2162 }
2163
2164 static const BlkActionOps actions[] = {
2165 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2166 .instance_size = sizeof(ExternalSnapshotState),
2167 .prepare = external_snapshot_prepare,
2168 .commit = external_snapshot_commit,
2169 .abort = external_snapshot_abort,
2170 .clean = external_snapshot_clean,
2171 },
2172 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2173 .instance_size = sizeof(ExternalSnapshotState),
2174 .prepare = external_snapshot_prepare,
2175 .commit = external_snapshot_commit,
2176 .abort = external_snapshot_abort,
2177 .clean = external_snapshot_clean,
2178 },
2179 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2180 .instance_size = sizeof(DriveBackupState),
2181 .prepare = drive_backup_prepare,
2182 .commit = drive_backup_commit,
2183 .abort = drive_backup_abort,
2184 .clean = drive_backup_clean,
2185 },
2186 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2187 .instance_size = sizeof(BlockdevBackupState),
2188 .prepare = blockdev_backup_prepare,
2189 .commit = blockdev_backup_commit,
2190 .abort = blockdev_backup_abort,
2191 .clean = blockdev_backup_clean,
2192 },
2193 [TRANSACTION_ACTION_KIND_ABORT] = {
2194 .instance_size = sizeof(BlkActionState),
2195 .prepare = abort_prepare,
2196 .commit = abort_commit,
2197 },
2198 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2199 .instance_size = sizeof(InternalSnapshotState),
2200 .prepare = internal_snapshot_prepare,
2201 .abort = internal_snapshot_abort,
2202 .clean = internal_snapshot_clean,
2203 },
2204 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2205 .instance_size = sizeof(BlockDirtyBitmapState),
2206 .prepare = block_dirty_bitmap_add_prepare,
2207 .abort = block_dirty_bitmap_add_abort,
2208 },
2209 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2210 .instance_size = sizeof(BlockDirtyBitmapState),
2211 .prepare = block_dirty_bitmap_clear_prepare,
2212 .commit = block_dirty_bitmap_clear_commit,
2213 .abort = block_dirty_bitmap_clear_abort,
2214 }
2215 };
2216
2217 /**
2218 * Allocate a TransactionProperties structure if necessary, and fill
2219 * that structure with desired defaults if they are unset.
2220 */
2221 static TransactionProperties *get_transaction_properties(
2222 TransactionProperties *props)
2223 {
2224 if (!props) {
2225 props = g_new0(TransactionProperties, 1);
2226 }
2227
2228 if (!props->has_completion_mode) {
2229 props->has_completion_mode = true;
2230 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2231 }
2232
2233 return props;
2234 }
2235
2236 /*
2237 * 'Atomic' group operations. The operations are performed as a set, and if
2238 * any fail then we roll back all operations in the group.
2239 */
2240 void qmp_transaction(TransactionActionList *dev_list,
2241 bool has_props,
2242 struct TransactionProperties *props,
2243 Error **errp)
2244 {
2245 TransactionActionList *dev_entry = dev_list;
2246 BlockJobTxn *block_job_txn = NULL;
2247 BlkActionState *state, *next;
2248 Error *local_err = NULL;
2249
2250 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2251 QSIMPLEQ_INIT(&snap_bdrv_states);
2252
2253 /* Does this transaction get canceled as a group on failure?
2254 * If not, we don't really need to make a BlockJobTxn.
2255 */
2256 props = get_transaction_properties(props);
2257 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2258 block_job_txn = block_job_txn_new();
2259 }
2260
2261 /* drain all i/o before any operations */
2262 bdrv_drain_all();
2263
2264 /* We don't do anything in this loop that commits us to the operations */
2265 while (NULL != dev_entry) {
2266 TransactionAction *dev_info = NULL;
2267 const BlkActionOps *ops;
2268
2269 dev_info = dev_entry->value;
2270 dev_entry = dev_entry->next;
2271
2272 assert(dev_info->type < ARRAY_SIZE(actions));
2273
2274 ops = &actions[dev_info->type];
2275 assert(ops->instance_size > 0);
2276
2277 state = g_malloc0(ops->instance_size);
2278 state->ops = ops;
2279 state->action = dev_info;
2280 state->block_job_txn = block_job_txn;
2281 state->txn_props = props;
2282 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2283
2284 state->ops->prepare(state, &local_err);
2285 if (local_err) {
2286 error_propagate(errp, local_err);
2287 goto delete_and_fail;
2288 }
2289 }
2290
2291 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2292 if (state->ops->commit) {
2293 state->ops->commit(state);
2294 }
2295 }
2296
2297 /* success */
2298 goto exit;
2299
2300 delete_and_fail:
2301 /* failure, and it is all-or-none; roll back all operations */
2302 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2303 if (state->ops->abort) {
2304 state->ops->abort(state);
2305 }
2306 }
2307 exit:
2308 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2309 if (state->ops->clean) {
2310 state->ops->clean(state);
2311 }
2312 g_free(state);
2313 }
2314 if (!has_props) {
2315 qapi_free_TransactionProperties(props);
2316 }
2317 block_job_txn_unref(block_job_txn);
2318 }
2319
2320 void qmp_eject(bool has_device, const char *device,
2321 bool has_id, const char *id,
2322 bool has_force, bool force, Error **errp)
2323 {
2324 Error *local_err = NULL;
2325 int rc;
2326
2327 if (!has_force) {
2328 force = false;
2329 }
2330
2331 rc = do_open_tray(has_device ? device : NULL,
2332 has_id ? id : NULL,
2333 force, &local_err);
2334 if (rc && rc != -ENOSYS) {
2335 error_propagate(errp, local_err);
2336 return;
2337 }
2338 error_free(local_err);
2339
2340 blockdev_remove_medium(has_device, device, has_id, id, errp);
2341 }
2342
2343 void qmp_block_passwd(bool has_device, const char *device,
2344 bool has_node_name, const char *node_name,
2345 const char *password, Error **errp)
2346 {
2347 error_setg(errp,
2348 "Setting block passwords directly is no longer supported");
2349 }
2350
2351 /*
2352 * Attempt to open the tray of @device.
2353 * If @force, ignore its tray lock.
2354 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2355 * On error, store an error through @errp and return -errno.
2356 * If @device does not exist, return -ENODEV.
2357 * If it has no removable media, return -ENOTSUP.
2358 * If it has no tray, return -ENOSYS.
2359 * If the guest was asked to open the tray, return -EINPROGRESS.
2360 * Else, return 0.
2361 */
2362 static int do_open_tray(const char *blk_name, const char *qdev_id,
2363 bool force, Error **errp)
2364 {
2365 BlockBackend *blk;
2366 const char *device = qdev_id ?: blk_name;
2367 bool locked;
2368
2369 blk = qmp_get_blk(blk_name, qdev_id, errp);
2370 if (!blk) {
2371 return -ENODEV;
2372 }
2373
2374 if (!blk_dev_has_removable_media(blk)) {
2375 error_setg(errp, "Device '%s' is not removable", device);
2376 return -ENOTSUP;
2377 }
2378
2379 if (!blk_dev_has_tray(blk)) {
2380 error_setg(errp, "Device '%s' does not have a tray", device);
2381 return -ENOSYS;
2382 }
2383
2384 if (blk_dev_is_tray_open(blk)) {
2385 return 0;
2386 }
2387
2388 locked = blk_dev_is_medium_locked(blk);
2389 if (locked) {
2390 blk_dev_eject_request(blk, force);
2391 }
2392
2393 if (!locked || force) {
2394 blk_dev_change_media_cb(blk, false, &error_abort);
2395 }
2396
2397 if (locked && !force) {
2398 error_setg(errp, "Device '%s' is locked and force was not specified, "
2399 "wait for tray to open and try again", device);
2400 return -EINPROGRESS;
2401 }
2402
2403 return 0;
2404 }
2405
2406 void qmp_blockdev_open_tray(bool has_device, const char *device,
2407 bool has_id, const char *id,
2408 bool has_force, bool force,
2409 Error **errp)
2410 {
2411 Error *local_err = NULL;
2412 int rc;
2413
2414 if (!has_force) {
2415 force = false;
2416 }
2417 rc = do_open_tray(has_device ? device : NULL,
2418 has_id ? id : NULL,
2419 force, &local_err);
2420 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
2421 error_propagate(errp, local_err);
2422 return;
2423 }
2424 error_free(local_err);
2425 }
2426
2427 void qmp_blockdev_close_tray(bool has_device, const char *device,
2428 bool has_id, const char *id,
2429 Error **errp)
2430 {
2431 BlockBackend *blk;
2432 Error *local_err = NULL;
2433
2434 device = has_device ? device : NULL;
2435 id = has_id ? id : NULL;
2436
2437 blk = qmp_get_blk(device, id, errp);
2438 if (!blk) {
2439 return;
2440 }
2441
2442 if (!blk_dev_has_removable_media(blk)) {
2443 error_setg(errp, "Device '%s' is not removable", device ?: id);
2444 return;
2445 }
2446
2447 if (!blk_dev_has_tray(blk)) {
2448 /* Ignore this command on tray-less devices */
2449 return;
2450 }
2451
2452 if (!blk_dev_is_tray_open(blk)) {
2453 return;
2454 }
2455
2456 blk_dev_change_media_cb(blk, true, &local_err);
2457 if (local_err) {
2458 error_propagate(errp, local_err);
2459 return;
2460 }
2461 }
2462
2463 static void blockdev_remove_medium(bool has_device, const char *device,
2464 bool has_id, const char *id, Error **errp)
2465 {
2466 BlockBackend *blk;
2467 BlockDriverState *bs;
2468 AioContext *aio_context;
2469 bool has_attached_device;
2470
2471 device = has_device ? device : NULL;
2472 id = has_id ? id : NULL;
2473
2474 blk = qmp_get_blk(device, id, errp);
2475 if (!blk) {
2476 return;
2477 }
2478
2479 /* For BBs without a device, we can exchange the BDS tree at will */
2480 has_attached_device = blk_get_attached_dev(blk);
2481
2482 if (has_attached_device && !blk_dev_has_removable_media(blk)) {
2483 error_setg(errp, "Device '%s' is not removable", device ?: id);
2484 return;
2485 }
2486
2487 if (has_attached_device && blk_dev_has_tray(blk) &&
2488 !blk_dev_is_tray_open(blk))
2489 {
2490 error_setg(errp, "Tray of device '%s' is not open", device ?: id);
2491 return;
2492 }
2493
2494 bs = blk_bs(blk);
2495 if (!bs) {
2496 return;
2497 }
2498
2499 aio_context = bdrv_get_aio_context(bs);
2500 aio_context_acquire(aio_context);
2501
2502 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2503 goto out;
2504 }
2505
2506 blk_remove_bs(blk);
2507
2508 if (!blk_dev_has_tray(blk)) {
2509 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2510 * called at all); therefore, the medium needs to be ejected here.
2511 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2512 * value passed here (i.e. false). */
2513 blk_dev_change_media_cb(blk, false, &error_abort);
2514 }
2515
2516 out:
2517 aio_context_release(aio_context);
2518 }
2519
2520 void qmp_blockdev_remove_medium(const char *id, Error **errp)
2521 {
2522 blockdev_remove_medium(false, NULL, true, id, errp);
2523 }
2524
2525 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2526 BlockDriverState *bs, Error **errp)
2527 {
2528 Error *local_err = NULL;
2529 bool has_device;
2530 int ret;
2531
2532 /* For BBs without a device, we can exchange the BDS tree at will */
2533 has_device = blk_get_attached_dev(blk);
2534
2535 if (has_device && !blk_dev_has_removable_media(blk)) {
2536 error_setg(errp, "Device is not removable");
2537 return;
2538 }
2539
2540 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2541 error_setg(errp, "Tray of the device is not open");
2542 return;
2543 }
2544
2545 if (blk_bs(blk)) {
2546 error_setg(errp, "There already is a medium in the device");
2547 return;
2548 }
2549
2550 ret = blk_insert_bs(blk, bs, errp);
2551 if (ret < 0) {
2552 return;
2553 }
2554
2555 if (!blk_dev_has_tray(blk)) {
2556 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2557 * called at all); therefore, the medium needs to be pushed into the
2558 * slot here.
2559 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2560 * value passed here (i.e. true). */
2561 blk_dev_change_media_cb(blk, true, &local_err);
2562 if (local_err) {
2563 error_propagate(errp, local_err);
2564 blk_remove_bs(blk);
2565 return;
2566 }
2567 }
2568 }
2569
2570 static void blockdev_insert_medium(bool has_device, const char *device,
2571 bool has_id, const char *id,
2572 const char *node_name, Error **errp)
2573 {
2574 BlockBackend *blk;
2575 BlockDriverState *bs;
2576
2577 blk = qmp_get_blk(has_device ? device : NULL,
2578 has_id ? id : NULL,
2579 errp);
2580 if (!blk) {
2581 return;
2582 }
2583
2584 bs = bdrv_find_node(node_name);
2585 if (!bs) {
2586 error_setg(errp, "Node '%s' not found", node_name);
2587 return;
2588 }
2589
2590 if (bdrv_has_blk(bs)) {
2591 error_setg(errp, "Node '%s' is already in use", node_name);
2592 return;
2593 }
2594
2595 qmp_blockdev_insert_anon_medium(blk, bs, errp);
2596 }
2597
2598 void qmp_blockdev_insert_medium(const char *id, const char *node_name,
2599 Error **errp)
2600 {
2601 blockdev_insert_medium(false, NULL, true, id, node_name, errp);
2602 }
2603
2604 void qmp_blockdev_change_medium(bool has_device, const char *device,
2605 bool has_id, const char *id,
2606 const char *filename,
2607 bool has_format, const char *format,
2608 bool has_read_only,
2609 BlockdevChangeReadOnlyMode read_only,
2610 Error **errp)
2611 {
2612 BlockBackend *blk;
2613 BlockDriverState *medium_bs = NULL;
2614 int bdrv_flags;
2615 bool detect_zeroes;
2616 int rc;
2617 QDict *options = NULL;
2618 Error *err = NULL;
2619
2620 blk = qmp_get_blk(has_device ? device : NULL,
2621 has_id ? id : NULL,
2622 errp);
2623 if (!blk) {
2624 goto fail;
2625 }
2626
2627 if (blk_bs(blk)) {
2628 blk_update_root_state(blk);
2629 }
2630
2631 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2632 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2633 BDRV_O_PROTOCOL);
2634
2635 if (!has_read_only) {
2636 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2637 }
2638
2639 switch (read_only) {
2640 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2641 break;
2642
2643 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2644 bdrv_flags &= ~BDRV_O_RDWR;
2645 break;
2646
2647 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2648 bdrv_flags |= BDRV_O_RDWR;
2649 break;
2650
2651 default:
2652 abort();
2653 }
2654
2655 options = qdict_new();
2656 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2657 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
2658
2659 if (has_format) {
2660 qdict_put_str(options, "driver", format);
2661 }
2662
2663 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
2664 if (!medium_bs) {
2665 goto fail;
2666 }
2667
2668 rc = do_open_tray(has_device ? device : NULL,
2669 has_id ? id : NULL,
2670 false, &err);
2671 if (rc && rc != -ENOSYS) {
2672 error_propagate(errp, err);
2673 goto fail;
2674 }
2675 error_free(err);
2676 err = NULL;
2677
2678 blockdev_remove_medium(has_device, device, has_id, id, &err);
2679 if (err) {
2680 error_propagate(errp, err);
2681 goto fail;
2682 }
2683
2684 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2685 if (err) {
2686 error_propagate(errp, err);
2687 goto fail;
2688 }
2689
2690 qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2691
2692 fail:
2693 /* If the medium has been inserted, the device has its own reference, so
2694 * ours must be relinquished; and if it has not been inserted successfully,
2695 * the reference must be relinquished anyway */
2696 bdrv_unref(medium_bs);
2697 }
2698
2699 /* throttling disk I/O limits */
2700 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2701 {
2702 ThrottleConfig cfg;
2703 BlockDriverState *bs;
2704 BlockBackend *blk;
2705 AioContext *aio_context;
2706
2707 blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
2708 arg->has_id ? arg->id : NULL,
2709 errp);
2710 if (!blk) {
2711 return;
2712 }
2713
2714 aio_context = blk_get_aio_context(blk);
2715 aio_context_acquire(aio_context);
2716
2717 bs = blk_bs(blk);
2718 if (!bs) {
2719 error_setg(errp, "Device has no medium");
2720 goto out;
2721 }
2722
2723 throttle_config_init(&cfg);
2724 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
2725 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd;
2726 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
2727
2728 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
2729 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd;
2730 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
2731
2732 if (arg->has_bps_max) {
2733 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2734 }
2735 if (arg->has_bps_rd_max) {
2736 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2737 }
2738 if (arg->has_bps_wr_max) {
2739 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2740 }
2741 if (arg->has_iops_max) {
2742 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2743 }
2744 if (arg->has_iops_rd_max) {
2745 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2746 }
2747 if (arg->has_iops_wr_max) {
2748 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2749 }
2750
2751 if (arg->has_bps_max_length) {
2752 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2753 }
2754 if (arg->has_bps_rd_max_length) {
2755 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2756 }
2757 if (arg->has_bps_wr_max_length) {
2758 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2759 }
2760 if (arg->has_iops_max_length) {
2761 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2762 }
2763 if (arg->has_iops_rd_max_length) {
2764 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2765 }
2766 if (arg->has_iops_wr_max_length) {
2767 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2768 }
2769
2770 if (arg->has_iops_size) {
2771 cfg.op_size = arg->iops_size;
2772 }
2773
2774 if (!throttle_is_valid(&cfg, errp)) {
2775 goto out;
2776 }
2777
2778 if (throttle_enabled(&cfg)) {
2779 /* Enable I/O limits if they're not enabled yet, otherwise
2780 * just update the throttling group. */
2781 if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
2782 blk_io_limits_enable(blk,
2783 arg->has_group ? arg->group :
2784 arg->has_device ? arg->device :
2785 arg->id);
2786 } else if (arg->has_group) {
2787 blk_io_limits_update_group(blk, arg->group);
2788 }
2789 /* Set the new throttling configuration */
2790 blk_set_io_limits(blk, &cfg);
2791 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
2792 /* If all throttling settings are set to 0, disable I/O limits */
2793 blk_io_limits_disable(blk);
2794 }
2795
2796 out:
2797 aio_context_release(aio_context);
2798 }
2799
2800 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2801 bool has_granularity, uint32_t granularity,
2802 bool has_persistent, bool persistent,
2803 bool has_autoload, bool autoload,
2804 Error **errp)
2805 {
2806 BlockDriverState *bs;
2807 BdrvDirtyBitmap *bitmap;
2808
2809 if (!name || name[0] == '\0') {
2810 error_setg(errp, "Bitmap name cannot be empty");
2811 return;
2812 }
2813
2814 bs = bdrv_lookup_bs(node, node, errp);
2815 if (!bs) {
2816 return;
2817 }
2818
2819 if (has_granularity) {
2820 if (granularity < 512 || !is_power_of_2(granularity)) {
2821 error_setg(errp, "Granularity must be power of 2 "
2822 "and at least 512");
2823 return;
2824 }
2825 } else {
2826 /* Default to cluster size, if available: */
2827 granularity = bdrv_get_default_bitmap_granularity(bs);
2828 }
2829
2830 if (!has_persistent) {
2831 persistent = false;
2832 }
2833
2834 if (has_autoload) {
2835 warn_report("Autoload option is deprecated and its value is ignored");
2836 }
2837
2838 if (persistent &&
2839 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
2840 {
2841 return;
2842 }
2843
2844 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2845 if (bitmap == NULL) {
2846 return;
2847 }
2848
2849 bdrv_dirty_bitmap_set_persistance(bitmap, persistent);
2850 }
2851
2852 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2853 Error **errp)
2854 {
2855 BlockDriverState *bs;
2856 BdrvDirtyBitmap *bitmap;
2857 Error *local_err = NULL;
2858
2859 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2860 if (!bitmap || !bs) {
2861 return;
2862 }
2863
2864 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2865 error_setg(errp,
2866 "Bitmap '%s' is currently frozen and cannot be removed",
2867 name);
2868 return;
2869 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
2870 error_setg(errp,
2871 "Bitmap '%s' is currently locked and cannot be removed",
2872 name);
2873 return;
2874 }
2875
2876 if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
2877 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
2878 if (local_err != NULL) {
2879 error_propagate(errp, local_err);
2880 return;
2881 }
2882 }
2883
2884 bdrv_dirty_bitmap_make_anon(bitmap);
2885 bdrv_release_dirty_bitmap(bs, bitmap);
2886 }
2887
2888 /**
2889 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2890 * immediately after a full backup operation.
2891 */
2892 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2893 Error **errp)
2894 {
2895 BdrvDirtyBitmap *bitmap;
2896 BlockDriverState *bs;
2897
2898 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2899 if (!bitmap || !bs) {
2900 return;
2901 }
2902
2903 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2904 error_setg(errp,
2905 "Bitmap '%s' is currently frozen and cannot be modified",
2906 name);
2907 return;
2908 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
2909 error_setg(errp,
2910 "Bitmap '%s' is currently locked and cannot be modified",
2911 name);
2912 return;
2913 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2914 error_setg(errp,
2915 "Bitmap '%s' is currently disabled and cannot be cleared",
2916 name);
2917 return;
2918 } else if (bdrv_dirty_bitmap_readonly(bitmap)) {
2919 error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name);
2920 return;
2921 }
2922
2923 bdrv_clear_dirty_bitmap(bitmap, NULL);
2924 }
2925
2926 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2927 const char *name,
2928 Error **errp)
2929 {
2930 BdrvDirtyBitmap *bitmap;
2931 BlockDriverState *bs;
2932 BlockDirtyBitmapSha256 *ret = NULL;
2933 char *sha256;
2934
2935 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2936 if (!bitmap || !bs) {
2937 return NULL;
2938 }
2939
2940 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2941 if (sha256 == NULL) {
2942 return NULL;
2943 }
2944
2945 ret = g_new(BlockDirtyBitmapSha256, 1);
2946 ret->sha256 = sha256;
2947
2948 return ret;
2949 }
2950
2951 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2952 {
2953 const char *id = qdict_get_str(qdict, "id");
2954 BlockBackend *blk;
2955 BlockDriverState *bs;
2956 AioContext *aio_context;
2957 Error *local_err = NULL;
2958
2959 bs = bdrv_find_node(id);
2960 if (bs) {
2961 qmp_blockdev_del(id, &local_err);
2962 if (local_err) {
2963 error_report_err(local_err);
2964 }
2965 return;
2966 }
2967
2968 blk = blk_by_name(id);
2969 if (!blk) {
2970 error_report("Device '%s' not found", id);
2971 return;
2972 }
2973
2974 if (!blk_legacy_dinfo(blk)) {
2975 error_report("Deleting device added with blockdev-add"
2976 " is not supported");
2977 return;
2978 }
2979
2980 aio_context = blk_get_aio_context(blk);
2981 aio_context_acquire(aio_context);
2982
2983 bs = blk_bs(blk);
2984 if (bs) {
2985 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2986 error_report_err(local_err);
2987 aio_context_release(aio_context);
2988 return;
2989 }
2990
2991 blk_remove_bs(blk);
2992 }
2993
2994 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2995 monitor_remove_blk(blk);
2996
2997 /* If this BlockBackend has a device attached to it, its refcount will be
2998 * decremented when the device is removed; otherwise we have to do so here.
2999 */
3000 if (blk_get_attached_dev(blk)) {
3001 /* Further I/O must not pause the guest */
3002 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
3003 BLOCKDEV_ON_ERROR_REPORT);
3004 } else {
3005 blk_unref(blk);
3006 }
3007
3008 aio_context_release(aio_context);
3009 }
3010
3011 void qmp_block_resize(bool has_device, const char *device,
3012 bool has_node_name, const char *node_name,
3013 int64_t size, Error **errp)
3014 {
3015 Error *local_err = NULL;
3016 BlockBackend *blk = NULL;
3017 BlockDriverState *bs;
3018 AioContext *aio_context;
3019 int ret;
3020
3021 bs = bdrv_lookup_bs(has_device ? device : NULL,
3022 has_node_name ? node_name : NULL,
3023 &local_err);
3024 if (local_err) {
3025 error_propagate(errp, local_err);
3026 return;
3027 }
3028
3029 aio_context = bdrv_get_aio_context(bs);
3030 aio_context_acquire(aio_context);
3031
3032 if (!bdrv_is_first_non_filter(bs)) {
3033 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
3034 goto out;
3035 }
3036
3037 if (size < 0) {
3038 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
3039 goto out;
3040 }
3041
3042 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
3043 error_setg(errp, QERR_DEVICE_IN_USE, device);
3044 goto out;
3045 }
3046
3047 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
3048 ret = blk_insert_bs(blk, bs, errp);
3049 if (ret < 0) {
3050 goto out;
3051 }
3052
3053 bdrv_drained_begin(bs);
3054 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
3055 bdrv_drained_end(bs);
3056
3057 out:
3058 blk_unref(blk);
3059 aio_context_release(aio_context);
3060 }
3061
3062 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
3063 bool has_base, const char *base,
3064 bool has_base_node, const char *base_node,
3065 bool has_backing_file, const char *backing_file,
3066 bool has_speed, int64_t speed,
3067 bool has_on_error, BlockdevOnError on_error,
3068 Error **errp)
3069 {
3070 BlockDriverState *bs, *iter;
3071 BlockDriverState *base_bs = NULL;
3072 AioContext *aio_context;
3073 Error *local_err = NULL;
3074 const char *base_name = NULL;
3075
3076 if (!has_on_error) {
3077 on_error = BLOCKDEV_ON_ERROR_REPORT;
3078 }
3079
3080 bs = bdrv_lookup_bs(device, device, errp);
3081 if (!bs) {
3082 return;
3083 }
3084
3085 aio_context = bdrv_get_aio_context(bs);
3086 aio_context_acquire(aio_context);
3087
3088 if (has_base && has_base_node) {
3089 error_setg(errp, "'base' and 'base-node' cannot be specified "
3090 "at the same time");
3091 goto out;
3092 }
3093
3094 if (has_base) {
3095 base_bs = bdrv_find_backing_image(bs, base);
3096 if (base_bs == NULL) {
3097 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3098 goto out;
3099 }
3100 assert(bdrv_get_aio_context(base_bs) == aio_context);
3101 base_name = base;
3102 }
3103
3104 if (has_base_node) {
3105 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3106 if (!base_bs) {
3107 goto out;
3108 }
3109 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
3110 error_setg(errp, "Node '%s' is not a backing image of '%s'",
3111 base_node, device);
3112 goto out;
3113 }
3114 assert(bdrv_get_aio_context(base_bs) == aio_context);
3115 base_name = base_bs->filename;
3116 }
3117
3118 /* Check for op blockers in the whole chain between bs and base */
3119 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
3120 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
3121 goto out;
3122 }
3123 }
3124
3125 /* if we are streaming the entire chain, the result will have no backing
3126 * file, and specifying one is therefore an error */
3127 if (base_bs == NULL && has_backing_file) {
3128 error_setg(errp, "backing file specified, but streaming the "
3129 "entire chain");
3130 goto out;
3131 }
3132
3133 /* backing_file string overrides base bs filename */
3134 base_name = has_backing_file ? backing_file : base_name;
3135
3136 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
3137 has_speed ? speed : 0, on_error, &local_err);
3138 if (local_err) {
3139 error_propagate(errp, local_err);
3140 goto out;
3141 }
3142
3143 trace_qmp_block_stream(bs, bs->job);
3144
3145 out:
3146 aio_context_release(aio_context);
3147 }
3148
3149 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3150 bool has_base, const char *base,
3151 bool has_top, const char *top,
3152 bool has_backing_file, const char *backing_file,
3153 bool has_speed, int64_t speed,
3154 bool has_filter_node_name, const char *filter_node_name,
3155 Error **errp)
3156 {
3157 BlockDriverState *bs;
3158 BlockDriverState *iter;
3159 BlockDriverState *base_bs, *top_bs;
3160 AioContext *aio_context;
3161 Error *local_err = NULL;
3162 /* This will be part of the QMP command, if/when the
3163 * BlockdevOnError change for blkmirror makes it in
3164 */
3165 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3166
3167 if (!has_speed) {
3168 speed = 0;
3169 }
3170 if (!has_filter_node_name) {
3171 filter_node_name = NULL;
3172 }
3173
3174 /* Important Note:
3175 * libvirt relies on the DeviceNotFound error class in order to probe for
3176 * live commit feature versions; for this to work, we must make sure to
3177 * perform the device lookup before any generic errors that may occur in a
3178 * scenario in which all optional arguments are omitted. */
3179 bs = qmp_get_root_bs(device, &local_err);
3180 if (!bs) {
3181 bs = bdrv_lookup_bs(device, device, NULL);
3182 if (!bs) {
3183 error_free(local_err);
3184 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3185 "Device '%s' not found", device);
3186 } else {
3187 error_propagate(errp, local_err);
3188 }
3189 return;
3190 }
3191
3192 aio_context = bdrv_get_aio_context(bs);
3193 aio_context_acquire(aio_context);
3194
3195 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3196 goto out;
3197 }
3198
3199 /* default top_bs is the active layer */
3200 top_bs = bs;
3201
3202 if (has_top && top) {
3203 if (strcmp(bs->filename, top) != 0) {
3204 top_bs = bdrv_find_backing_image(bs, top);
3205 }
3206 }
3207
3208 if (top_bs == NULL) {
3209 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3210 goto out;
3211 }
3212
3213 assert(bdrv_get_aio_context(top_bs) == aio_context);
3214
3215 if (has_base && base) {
3216 base_bs = bdrv_find_backing_image(top_bs, base);
3217 } else {
3218 base_bs = bdrv_find_base(top_bs);
3219 }
3220
3221 if (base_bs == NULL) {
3222 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3223 goto out;
3224 }
3225
3226 assert(bdrv_get_aio_context(base_bs) == aio_context);
3227
3228 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
3229 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3230 goto out;
3231 }
3232 }
3233
3234 /* Do not allow attempts to commit an image into itself */
3235 if (top_bs == base_bs) {
3236 error_setg(errp, "cannot commit an image into itself");
3237 goto out;
3238 }
3239
3240 if (top_bs == bs) {
3241 if (has_backing_file) {
3242 error_setg(errp, "'backing-file' specified,"
3243 " but 'top' is the active layer");
3244 goto out;
3245 }
3246 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3247 BLOCK_JOB_DEFAULT, speed, on_error,
3248 filter_node_name, NULL, NULL, false, &local_err);
3249 } else {
3250 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
3251 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3252 goto out;
3253 }
3254 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed,
3255 on_error, has_backing_file ? backing_file : NULL,
3256 filter_node_name, &local_err);
3257 }
3258 if (local_err != NULL) {
3259 error_propagate(errp, local_err);
3260 goto out;
3261 }
3262
3263 out:
3264 aio_context_release(aio_context);
3265 }
3266
3267 static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
3268 Error **errp)
3269 {
3270 BlockDriverState *bs;
3271 BlockDriverState *target_bs;
3272 BlockDriverState *source = NULL;
3273 BlockJob *job = NULL;
3274 BdrvDirtyBitmap *bmap = NULL;
3275 AioContext *aio_context;
3276 QDict *options = NULL;
3277 Error *local_err = NULL;
3278 int flags, job_flags = BLOCK_JOB_DEFAULT;
3279 int64_t size;
3280 bool set_backing_hd = false;
3281
3282 if (!backup->has_speed) {
3283 backup->speed = 0;
3284 }
3285 if (!backup->has_on_source_error) {
3286 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3287 }
3288 if (!backup->has_on_target_error) {
3289 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3290 }
3291 if (!backup->has_mode) {
3292 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3293 }
3294 if (!backup->has_job_id) {
3295 backup->job_id = NULL;
3296 }
3297 if (!backup->has_auto_finalize) {
3298 backup->auto_finalize = true;
3299 }
3300 if (!backup->has_auto_dismiss) {
3301 backup->auto_dismiss = true;
3302 }
3303 if (!backup->has_compress) {
3304 backup->compress = false;
3305 }
3306
3307 bs = qmp_get_root_bs(backup->device, errp);
3308 if (!bs) {
3309 return NULL;
3310 }
3311
3312 aio_context = bdrv_get_aio_context(bs);
3313 aio_context_acquire(aio_context);
3314
3315 if (!backup->has_format) {
3316 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
3317 NULL : (char*) bs->drv->format_name;
3318 }
3319
3320 /* Early check to avoid creating target */
3321 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3322 goto out;
3323 }
3324
3325 flags = bs->open_flags | BDRV_O_RDWR;
3326
3327 /* See if we have a backing HD we can use to create our new image
3328 * on top of. */
3329 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3330 source = backing_bs(bs);
3331 if (!source) {
3332 backup->sync = MIRROR_SYNC_MODE_FULL;
3333 }
3334 }
3335 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3336 source = bs;
3337 flags |= BDRV_O_NO_BACKING;
3338 set_backing_hd = true;
3339 }
3340
3341 size = bdrv_getlength(bs);
3342 if (size < 0) {
3343 error_setg_errno(errp, -size, "bdrv_getlength failed");
3344 goto out;
3345 }
3346
3347 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
3348 assert(backup->format);
3349 if (source) {
3350 bdrv_img_create(backup->target, backup->format, source->filename,
3351 source->drv->format_name, NULL,
3352 size, flags, false, &local_err);
3353 } else {
3354 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
3355 size, flags, false, &local_err);
3356 }
3357 }
3358
3359 if (local_err) {
3360 error_propagate(errp, local_err);
3361 goto out;
3362 }
3363
3364 if (backup->format) {
3365 if (!options) {
3366 options = qdict_new();
3367 }
3368 qdict_put_str(options, "driver", backup->format);
3369 }
3370
3371 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
3372 if (!target_bs) {
3373 goto out;
3374 }
3375
3376 bdrv_set_aio_context(target_bs, aio_context);
3377
3378 if (set_backing_hd) {
3379 bdrv_set_backing_hd(target_bs, source, &local_err);
3380 if (local_err) {
3381 bdrv_unref(target_bs);
3382 goto out;
3383 }
3384 }
3385
3386 if (backup->has_bitmap) {
3387 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3388 if (!bmap) {
3389 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3390 bdrv_unref(target_bs);
3391 goto out;
3392 }
3393 if (bdrv_dirty_bitmap_qmp_locked(bmap)) {
3394 error_setg(errp,
3395 "Bitmap '%s' is currently locked and cannot be used for "
3396 "backup", backup->bitmap);
3397 goto out;
3398 }
3399 }
3400 if (!backup->auto_finalize) {
3401 job_flags |= BLOCK_JOB_MANUAL_FINALIZE;
3402 }
3403 if (!backup->auto_dismiss) {
3404 job_flags |= BLOCK_JOB_MANUAL_DISMISS;
3405 }
3406
3407 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3408 backup->sync, bmap, backup->compress,
3409 backup->on_source_error, backup->on_target_error,
3410 job_flags, NULL, NULL, txn, &local_err);
3411 bdrv_unref(target_bs);
3412 if (local_err != NULL) {
3413 error_propagate(errp, local_err);
3414 goto out;
3415 }
3416
3417 out:
3418 aio_context_release(aio_context);
3419 return job;
3420 }
3421
3422 void qmp_drive_backup(DriveBackup *arg, Error **errp)
3423 {
3424
3425 BlockJob *job;
3426 job = do_drive_backup(arg, NULL, errp);
3427 if (job) {
3428 block_job_start(job);
3429 }
3430 }
3431
3432 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3433 {
3434 return bdrv_named_nodes_list(errp);
3435 }
3436
3437 BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn,
3438 Error **errp)
3439 {
3440 BlockDriverState *bs;
3441 BlockDriverState *target_bs;
3442 Error *local_err = NULL;
3443 AioContext *aio_context;
3444 BlockJob *job = NULL;
3445 int job_flags = BLOCK_JOB_DEFAULT;
3446
3447 if (!backup->has_speed) {
3448 backup->speed = 0;
3449 }
3450 if (!backup->has_on_source_error) {
3451 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3452 }
3453 if (!backup->has_on_target_error) {
3454 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3455 }
3456 if (!backup->has_job_id) {
3457 backup->job_id = NULL;
3458 }
3459 if (!backup->has_auto_finalize) {
3460 backup->auto_finalize = true;
3461 }
3462 if (!backup->has_auto_dismiss) {
3463 backup->auto_dismiss = true;
3464 }
3465 if (!backup->has_compress) {
3466 backup->compress = false;
3467 }
3468
3469 bs = qmp_get_root_bs(backup->device, errp);
3470 if (!bs) {
3471 return NULL;
3472 }
3473
3474 aio_context = bdrv_get_aio_context(bs);
3475 aio_context_acquire(aio_context);
3476
3477 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
3478 if (!target_bs) {
3479 goto out;
3480 }
3481
3482 if (bdrv_get_aio_context(target_bs) != aio_context) {
3483 if (!bdrv_has_blk(target_bs)) {
3484 /* The target BDS is not attached, we can safely move it to another
3485 * AioContext. */
3486 bdrv_set_aio_context(target_bs, aio_context);
3487 } else {
3488 error_setg(errp, "Target is attached to a different thread from "
3489 "source.");
3490 goto out;
3491 }
3492 }
3493 if (!backup->auto_finalize) {
3494 job_flags |= BLOCK_JOB_MANUAL_FINALIZE;
3495 }
3496 if (!backup->auto_dismiss) {
3497 job_flags |= BLOCK_JOB_MANUAL_DISMISS;
3498 }
3499 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3500 backup->sync, NULL, backup->compress,
3501 backup->on_source_error, backup->on_target_error,
3502 job_flags, NULL, NULL, txn, &local_err);
3503 if (local_err != NULL) {
3504 error_propagate(errp, local_err);
3505 }
3506 out:
3507 aio_context_release(aio_context);
3508 return job;
3509 }
3510
3511 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
3512 {
3513 BlockJob *job;
3514 job = do_blockdev_backup(arg, NULL, errp);
3515 if (job) {
3516 block_job_start(job);
3517 }
3518 }
3519
3520 /* Parameter check and block job starting for drive mirroring.
3521 * Caller should hold @device and @target's aio context (must be the same).
3522 **/
3523 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3524 BlockDriverState *target,
3525 bool has_replaces, const char *replaces,
3526 enum MirrorSyncMode sync,
3527 BlockMirrorBackingMode backing_mode,
3528 bool has_speed, int64_t speed,
3529 bool has_granularity, uint32_t granularity,
3530 bool has_buf_size, int64_t buf_size,
3531 bool has_on_source_error,
3532 BlockdevOnError on_source_error,
3533 bool has_on_target_error,
3534 BlockdevOnError on_target_error,
3535 bool has_unmap, bool unmap,
3536 bool has_filter_node_name,
3537 const char *filter_node_name,
3538 Error **errp)
3539 {
3540
3541 if (!has_speed) {
3542 speed = 0;
3543 }
3544 if (!has_on_source_error) {
3545 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3546 }
3547 if (!has_on_target_error) {
3548 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3549 }
3550 if (!has_granularity) {
3551 granularity = 0;
3552 }
3553 if (!has_buf_size) {
3554 buf_size = 0;
3555 }
3556 if (!has_unmap) {
3557 unmap = true;
3558 }
3559 if (!has_filter_node_name) {
3560 filter_node_name = NULL;
3561 }
3562
3563 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3564 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3565 "a value in range [512B, 64MB]");
3566 return;
3567 }
3568 if (granularity & (granularity - 1)) {
3569 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3570 "power of 2");
3571 return;
3572 }
3573
3574 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3575 return;
3576 }
3577 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3578 return;
3579 }
3580
3581 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3582 sync = MIRROR_SYNC_MODE_FULL;
3583 }
3584
3585 /* pass the node name to replace to mirror start since it's loose coupling
3586 * and will allow to check whether the node still exist at mirror completion
3587 */
3588 mirror_start(job_id, bs, target,
3589 has_replaces ? replaces : NULL,
3590 speed, granularity, buf_size, sync, backing_mode,
3591 on_source_error, on_target_error, unmap, filter_node_name,
3592 errp);
3593 }
3594
3595 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3596 {
3597 BlockDriverState *bs;
3598 BlockDriverState *source, *target_bs;
3599 AioContext *aio_context;
3600 BlockMirrorBackingMode backing_mode;
3601 Error *local_err = NULL;
3602 QDict *options = NULL;
3603 int flags;
3604 int64_t size;
3605 const char *format = arg->format;
3606
3607 bs = qmp_get_root_bs(arg->device, errp);
3608 if (!bs) {
3609 return;
3610 }
3611
3612 /* Early check to avoid creating target */
3613 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3614 return;
3615 }
3616
3617 aio_context = bdrv_get_aio_context(bs);
3618 aio_context_acquire(aio_context);
3619
3620 if (!arg->has_mode) {
3621 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3622 }
3623
3624 if (!arg->has_format) {
3625 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3626 ? NULL : bs->drv->format_name);
3627 }
3628
3629 flags = bs->open_flags | BDRV_O_RDWR;
3630 source = backing_bs(bs);
3631 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
3632 arg->sync = MIRROR_SYNC_MODE_FULL;
3633 }
3634 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3635 source = bs;
3636 }
3637
3638 size = bdrv_getlength(bs);
3639 if (size < 0) {
3640 error_setg_errno(errp, -size, "bdrv_getlength failed");
3641 goto out;
3642 }
3643
3644 if (arg->has_replaces) {
3645 BlockDriverState *to_replace_bs;
3646 AioContext *replace_aio_context;
3647 int64_t replace_size;
3648
3649 if (!arg->has_node_name) {
3650 error_setg(errp, "a node-name must be provided when replacing a"
3651 " named node of the graph");
3652 goto out;
3653 }
3654
3655 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
3656
3657 if (!to_replace_bs) {
3658 error_propagate(errp, local_err);
3659 goto out;
3660 }
3661
3662 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3663 aio_context_acquire(replace_aio_context);
3664 replace_size = bdrv_getlength(to_replace_bs);
3665 aio_context_release(replace_aio_context);
3666
3667 if (size != replace_size) {
3668 error_setg(errp, "cannot replace image with a mirror image of "
3669 "different size");
3670 goto out;
3671 }
3672 }
3673
3674 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3675 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3676 } else {
3677 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3678 }
3679
3680 /* Don't open backing image in create() */
3681 flags |= BDRV_O_NO_BACKING;
3682
3683 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
3684 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3685 {
3686 /* create new image w/o backing file */
3687 assert(format);
3688 bdrv_img_create(arg->target, format,
3689 NULL, NULL, NULL, size, flags, false, &local_err);
3690 } else {
3691 switch (arg->mode) {
3692 case NEW_IMAGE_MODE_EXISTING:
3693 break;
3694 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3695 /* create new image with backing file */
3696 bdrv_img_create(arg->target, format,
3697 source->filename,
3698 source->drv->format_name,
3699 NULL, size, flags, false, &local_err);
3700 break;
3701 default:
3702 abort();
3703 }
3704 }
3705
3706 if (local_err) {
3707 error_propagate(errp, local_err);
3708 goto out;
3709 }
3710
3711 options = qdict_new();
3712 if (arg->has_node_name) {
3713 qdict_put_str(options, "node-name", arg->node_name);
3714 }
3715 if (format) {
3716 qdict_put_str(options, "driver", format);
3717 }
3718
3719 /* Mirroring takes care of copy-on-write using the source's backing
3720 * file.
3721 */
3722 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3723 if (!target_bs) {
3724 goto out;
3725 }
3726
3727 bdrv_set_aio_context(target_bs, aio_context);
3728
3729 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3730 arg->has_replaces, arg->replaces, arg->sync,
3731 backing_mode, arg->has_speed, arg->speed,
3732 arg->has_granularity, arg->granularity,
3733 arg->has_buf_size, arg->buf_size,
3734 arg->has_on_source_error, arg->on_source_error,
3735 arg->has_on_target_error, arg->on_target_error,
3736 arg->has_unmap, arg->unmap,
3737 false, NULL,
3738 &local_err);
3739 bdrv_unref(target_bs);
3740 error_propagate(errp, local_err);
3741 out:
3742 aio_context_release(aio_context);
3743 }
3744
3745 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3746 const char *device, const char *target,
3747 bool has_replaces, const char *replaces,
3748 MirrorSyncMode sync,
3749 bool has_speed, int64_t speed,
3750 bool has_granularity, uint32_t granularity,
3751 bool has_buf_size, int64_t buf_size,
3752 bool has_on_source_error,
3753 BlockdevOnError on_source_error,
3754 bool has_on_target_error,
3755 BlockdevOnError on_target_error,
3756 bool has_filter_node_name,
3757 const char *filter_node_name,
3758 Error **errp)
3759 {
3760 BlockDriverState *bs;
3761 BlockDriverState *target_bs;
3762 AioContext *aio_context;
3763 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3764 Error *local_err = NULL;
3765
3766 bs = qmp_get_root_bs(device, errp);
3767 if (!bs) {
3768 return;
3769 }
3770
3771 target_bs = bdrv_lookup_bs(target, target, errp);
3772 if (!target_bs) {
3773 return;
3774 }
3775
3776 aio_context = bdrv_get_aio_context(bs);
3777 aio_context_acquire(aio_context);
3778
3779 bdrv_set_aio_context(target_bs, aio_context);
3780
3781 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3782 has_replaces, replaces, sync, backing_mode,
3783 has_speed, speed,
3784 has_granularity, granularity,
3785 has_buf_size, buf_size,
3786 has_on_source_error, on_source_error,
3787 has_on_target_error, on_target_error,
3788 true, true,
3789 has_filter_node_name, filter_node_name,
3790 &local_err);
3791 error_propagate(errp, local_err);
3792
3793 aio_context_release(aio_context);
3794 }
3795
3796 /* Get a block job using its ID and acquire its AioContext */
3797 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3798 Error **errp)
3799 {
3800 BlockJob *job;
3801
3802 assert(id != NULL);
3803
3804 *aio_context = NULL;
3805
3806 job = block_job_get(id);
3807
3808 if (!job) {
3809 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3810 "Block job '%s' not found", id);
3811 return NULL;
3812 }
3813
3814 *aio_context = blk_get_aio_context(job->blk);
3815 aio_context_acquire(*aio_context);
3816
3817 return job;
3818 }
3819
3820 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3821 {
3822 AioContext *aio_context;
3823 BlockJob *job = find_block_job(device, &aio_context, errp);
3824
3825 if (!job) {
3826 return;
3827 }
3828
3829 block_job_set_speed(job, speed, errp);
3830 aio_context_release(aio_context);
3831 }
3832
3833 void qmp_block_job_cancel(const char *device,
3834 bool has_force, bool force, Error **errp)
3835 {
3836 AioContext *aio_context;
3837 BlockJob *job = find_block_job(device, &aio_context, errp);
3838
3839 if (!job) {
3840 return;
3841 }
3842
3843 if (!has_force) {
3844 force = false;
3845 }
3846
3847 if (block_job_user_paused(job) && !force) {
3848 error_setg(errp, "The block job for device '%s' is currently paused",
3849 device);
3850 goto out;
3851 }
3852
3853 trace_qmp_block_job_cancel(job);
3854 block_job_user_cancel(job, force, errp);
3855 out:
3856 aio_context_release(aio_context);
3857 }
3858
3859 void qmp_block_job_pause(const char *device, Error **errp)
3860 {
3861 AioContext *aio_context;
3862 BlockJob *job = find_block_job(device, &aio_context, errp);
3863
3864 if (!job) {
3865 return;
3866 }
3867
3868 trace_qmp_block_job_pause(job);
3869 block_job_user_pause(job, errp);
3870 aio_context_release(aio_context);
3871 }
3872
3873 void qmp_block_job_resume(const char *device, Error **errp)
3874 {
3875 AioContext *aio_context;
3876 BlockJob *job = find_block_job(device, &aio_context, errp);
3877
3878 if (!job) {
3879 return;
3880 }
3881
3882 trace_qmp_block_job_resume(job);
3883 block_job_user_resume(job, errp);
3884 aio_context_release(aio_context);
3885 }
3886
3887 void qmp_block_job_complete(const char *device, Error **errp)
3888 {
3889 AioContext *aio_context;
3890 BlockJob *job = find_block_job(device, &aio_context, errp);
3891
3892 if (!job) {
3893 return;
3894 }
3895
3896 trace_qmp_block_job_complete(job);
3897 block_job_complete(job, errp);
3898 aio_context_release(aio_context);
3899 }
3900
3901 void qmp_block_job_finalize(const char *id, Error **errp)
3902 {
3903 AioContext *aio_context;
3904 BlockJob *job = find_block_job(id, &aio_context, errp);
3905
3906 if (!job) {
3907 return;
3908 }
3909
3910 trace_qmp_block_job_finalize(job);
3911 block_job_finalize(job, errp);
3912 aio_context_release(aio_context);
3913 }
3914
3915 void qmp_block_job_dismiss(const char *id, Error **errp)
3916 {
3917 AioContext *aio_context;
3918 BlockJob *job = find_block_job(id, &aio_context, errp);
3919
3920 if (!job) {
3921 return;
3922 }
3923
3924 trace_qmp_block_job_dismiss(job);
3925 block_job_dismiss(&job, errp);
3926 aio_context_release(aio_context);
3927 }
3928
3929 void qmp_change_backing_file(const char *device,
3930 const char *image_node_name,
3931 const char *backing_file,
3932 Error **errp)
3933 {
3934 BlockDriverState *bs = NULL;
3935 AioContext *aio_context;
3936 BlockDriverState *image_bs = NULL;
3937 Error *local_err = NULL;
3938 bool ro;
3939 int open_flags;
3940 int ret;
3941
3942 bs = qmp_get_root_bs(device, errp);
3943 if (!bs) {
3944 return;
3945 }
3946
3947 aio_context = bdrv_get_aio_context(bs);
3948 aio_context_acquire(aio_context);
3949
3950 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3951 if (local_err) {
3952 error_propagate(errp, local_err);
3953 goto out;
3954 }
3955
3956 if (!image_bs) {
3957 error_setg(errp, "image file not found");
3958 goto out;
3959 }
3960
3961 if (bdrv_find_base(image_bs) == image_bs) {
3962 error_setg(errp, "not allowing backing file change on an image "
3963 "without a backing file");
3964 goto out;
3965 }
3966
3967 /* even though we are not necessarily operating on bs, we need it to
3968 * determine if block ops are currently prohibited on the chain */
3969 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3970 goto out;
3971 }
3972
3973 /* final sanity check */
3974 if (!bdrv_chain_contains(bs, image_bs)) {
3975 error_setg(errp, "'%s' and image file are not in the same chain",
3976 device);
3977 goto out;
3978 }
3979
3980 /* if not r/w, reopen to make r/w */
3981 open_flags = image_bs->open_flags;
3982 ro = bdrv_is_read_only(image_bs);
3983
3984 if (ro) {
3985 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3986 if (local_err) {
3987 error_propagate(errp, local_err);
3988 goto out;
3989 }
3990 }
3991
3992 ret = bdrv_change_backing_file(image_bs, backing_file,
3993 image_bs->drv ? image_bs->drv->format_name : "");
3994
3995 if (ret < 0) {
3996 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3997 backing_file);
3998 /* don't exit here, so we can try to restore open flags if
3999 * appropriate */
4000 }
4001
4002 if (ro) {
4003 bdrv_reopen(image_bs, open_flags, &local_err);
4004 error_propagate(errp, local_err);
4005 }
4006
4007 out:
4008 aio_context_release(aio_context);
4009 }
4010
4011 void hmp_drive_add_node(Monitor *mon, const char *optstr)
4012 {
4013 QemuOpts *opts;
4014 QDict *qdict;
4015 Error *local_err = NULL;
4016
4017 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
4018 if (!opts) {
4019 return;
4020 }
4021
4022 qdict = qemu_opts_to_qdict(opts, NULL);
4023
4024 if (!qdict_get_try_str(qdict, "node-name")) {
4025 QDECREF(qdict);
4026 error_report("'node-name' needs to be specified");
4027 goto out;
4028 }
4029
4030 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
4031 if (!bs) {
4032 error_report_err(local_err);
4033 goto out;
4034 }
4035
4036 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4037
4038 out:
4039 qemu_opts_del(opts);
4040 }
4041
4042 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
4043 {
4044 BlockDriverState *bs;
4045 QObject *obj;
4046 Visitor *v = qobject_output_visitor_new(&obj);
4047 QDict *qdict;
4048 Error *local_err = NULL;
4049
4050 visit_type_BlockdevOptions(v, NULL, &options, &local_err);
4051 if (local_err) {
4052 error_propagate(errp, local_err);
4053 goto fail;
4054 }
4055
4056 visit_complete(v, &obj);
4057 qdict = qobject_to(QDict, obj);
4058
4059 qdict_flatten(qdict);
4060
4061 if (!qdict_get_try_str(qdict, "node-name")) {
4062 error_setg(errp, "'node-name' must be specified for the root node");
4063 goto fail;
4064 }
4065
4066 bs = bds_tree_init(qdict, errp);
4067 if (!bs) {
4068 goto fail;
4069 }
4070
4071 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4072
4073 fail:
4074 visit_free(v);
4075 }
4076
4077 void qmp_blockdev_del(const char *node_name, Error **errp)
4078 {
4079 AioContext *aio_context;
4080 BlockDriverState *bs;
4081
4082 bs = bdrv_find_node(node_name);
4083 if (!bs) {
4084 error_setg(errp, "Cannot find node %s", node_name);
4085 return;
4086 }
4087 if (bdrv_has_blk(bs)) {
4088 error_setg(errp, "Node %s is in use", node_name);
4089 return;
4090 }
4091 aio_context = bdrv_get_aio_context(bs);
4092 aio_context_acquire(aio_context);
4093
4094 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4095 goto out;
4096 }
4097
4098 if (!bs->monitor_list.tqe_prev) {
4099 error_setg(errp, "Node %s is not owned by the monitor",
4100 bs->node_name);
4101 goto out;
4102 }
4103
4104 if (bs->refcnt > 1) {
4105 error_setg(errp, "Block device %s is in use",
4106 bdrv_get_device_or_node_name(bs));
4107 goto out;
4108 }
4109
4110 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4111 bdrv_unref(bs);
4112
4113 out:
4114 aio_context_release(aio_context);
4115 }
4116
4117 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
4118 const char *child_name)
4119 {
4120 BdrvChild *child;
4121
4122 QLIST_FOREACH(child, &parent_bs->children, next) {
4123 if (strcmp(child->name, child_name) == 0) {
4124 return child;
4125 }
4126 }
4127
4128 return NULL;
4129 }
4130
4131 void qmp_x_blockdev_change(const char *parent, bool has_child,
4132 const char *child, bool has_node,
4133 const char *node, Error **errp)
4134 {
4135 BlockDriverState *parent_bs, *new_bs = NULL;
4136 BdrvChild *p_child;
4137
4138 parent_bs = bdrv_lookup_bs(parent, parent, errp);
4139 if (!parent_bs) {
4140 return;
4141 }
4142
4143 if (has_child == has_node) {
4144 if (has_child) {
4145 error_setg(errp, "The parameters child and node are in conflict");
4146 } else {
4147 error_setg(errp, "Either child or node must be specified");
4148 }
4149 return;
4150 }
4151
4152 if (has_child) {
4153 p_child = bdrv_find_child(parent_bs, child);
4154 if (!p_child) {
4155 error_setg(errp, "Node '%s' does not have child '%s'",
4156 parent, child);
4157 return;
4158 }
4159 bdrv_del_child(parent_bs, p_child, errp);
4160 }
4161
4162 if (has_node) {
4163 new_bs = bdrv_find_node(node);
4164 if (!new_bs) {
4165 error_setg(errp, "Node '%s' not found", node);
4166 return;
4167 }
4168 bdrv_add_child(parent_bs, new_bs, errp);
4169 }
4170 }
4171
4172 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4173 {
4174 BlockJobInfoList *head = NULL, **p_next = &head;
4175 BlockJob *job;
4176
4177 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
4178 BlockJobInfoList *elem;
4179 AioContext *aio_context;
4180
4181 if (block_job_is_internal(job)) {
4182 continue;
4183 }
4184 elem = g_new0(BlockJobInfoList, 1);
4185 aio_context = blk_get_aio_context(job->blk);
4186 aio_context_acquire(aio_context);
4187 elem->value = block_job_query(job, errp);
4188 aio_context_release(aio_context);
4189 if (!elem->value) {
4190 g_free(elem);
4191 qapi_free_BlockJobInfoList(head);
4192 return NULL;
4193 }
4194 *p_next = elem;
4195 p_next = &elem->next;
4196 }
4197
4198 return head;
4199 }
4200
4201 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
4202 bool has_force, bool force, Error **errp)
4203 {
4204 AioContext *old_context;
4205 AioContext *new_context;
4206 BlockDriverState *bs;
4207
4208 bs = bdrv_find_node(node_name);
4209 if (!bs) {
4210 error_setg(errp, "Cannot find node %s", node_name);
4211 return;
4212 }
4213
4214 /* Protects against accidents. */
4215 if (!(has_force && force) && bdrv_has_blk(bs)) {
4216 error_setg(errp, "Node %s is associated with a BlockBackend and could "
4217 "be in use (use force=true to override this check)",
4218 node_name);
4219 return;
4220 }
4221
4222 if (iothread->type == QTYPE_QSTRING) {
4223 IOThread *obj = iothread_by_id(iothread->u.s);
4224 if (!obj) {
4225 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
4226 return;
4227 }
4228
4229 new_context = iothread_get_aio_context(obj);
4230 } else {
4231 new_context = qemu_get_aio_context();
4232 }
4233
4234 old_context = bdrv_get_aio_context(bs);
4235 aio_context_acquire(old_context);
4236
4237 bdrv_set_aio_context(bs, new_context);
4238
4239 aio_context_release(old_context);
4240 }
4241
4242 void qmp_x_block_latency_histogram_set(
4243 const char *device,
4244 bool has_boundaries, uint64List *boundaries,
4245 bool has_boundaries_read, uint64List *boundaries_read,
4246 bool has_boundaries_write, uint64List *boundaries_write,
4247 bool has_boundaries_flush, uint64List *boundaries_flush,
4248 Error **errp)
4249 {
4250 BlockBackend *blk = blk_by_name(device);
4251 BlockAcctStats *stats;
4252
4253 if (!blk) {
4254 error_setg(errp, "Device '%s' not found", device);
4255 return;
4256 }
4257 stats = blk_get_stats(blk);
4258
4259 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write &&
4260 !has_boundaries_flush)
4261 {
4262 block_latency_histograms_clear(stats);
4263 return;
4264 }
4265
4266 if (has_boundaries || has_boundaries_read) {
4267 block_latency_histogram_set(
4268 stats, BLOCK_ACCT_READ,
4269 has_boundaries_read ? boundaries_read : boundaries);
4270 }
4271
4272 if (has_boundaries || has_boundaries_write) {
4273 block_latency_histogram_set(
4274 stats, BLOCK_ACCT_WRITE,
4275 has_boundaries_write ? boundaries_write : boundaries);
4276 }
4277
4278 if (has_boundaries || has_boundaries_flush) {
4279 block_latency_histogram_set(
4280 stats, BLOCK_ACCT_FLUSH,
4281 has_boundaries_flush ? boundaries_flush : boundaries);
4282 }
4283 }
4284
4285 QemuOptsList qemu_common_drive_opts = {
4286 .name = "drive",
4287 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4288 .desc = {
4289 {
4290 .name = "snapshot",
4291 .type = QEMU_OPT_BOOL,
4292 .help = "enable/disable snapshot mode",
4293 },{
4294 .name = "aio",
4295 .type = QEMU_OPT_STRING,
4296 .help = "host AIO implementation (threads, native)",
4297 },{
4298 .name = BDRV_OPT_CACHE_WB,
4299 .type = QEMU_OPT_BOOL,
4300 .help = "Enable writeback mode",
4301 },{
4302 .name = "format",
4303 .type = QEMU_OPT_STRING,
4304 .help = "disk format (raw, qcow2, ...)",
4305 },{
4306 .name = "rerror",
4307 .type = QEMU_OPT_STRING,
4308 .help = "read error action",
4309 },{
4310 .name = "werror",
4311 .type = QEMU_OPT_STRING,
4312 .help = "write error action",
4313 },{
4314 .name = BDRV_OPT_READ_ONLY,
4315 .type = QEMU_OPT_BOOL,
4316 .help = "open drive file as read-only",
4317 },
4318
4319 THROTTLE_OPTS,
4320
4321 {
4322 .name = "throttling.group",
4323 .type = QEMU_OPT_STRING,
4324 .help = "name of the block throttling group",
4325 },{
4326 .name = "copy-on-read",
4327 .type = QEMU_OPT_BOOL,
4328 .help = "copy read data from backing file into image file",
4329 },{
4330 .name = "detect-zeroes",
4331 .type = QEMU_OPT_STRING,
4332 .help = "try to optimize zero writes (off, on, unmap)",
4333 },{
4334 .name = "stats-account-invalid",
4335 .type = QEMU_OPT_BOOL,
4336 .help = "whether to account for invalid I/O operations "
4337 "in the statistics",
4338 },{
4339 .name = "stats-account-failed",
4340 .type = QEMU_OPT_BOOL,
4341 .help = "whether to account for failed I/O operations "
4342 "in the statistics",
4343 },
4344 { /* end of list */ }
4345 },
4346 };
4347
4348 QemuOptsList qemu_drive_opts = {
4349 .name = "drive",
4350 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4351 .desc = {
4352 /*
4353 * no elements => accept any params
4354 * validation will happen later
4355 */
4356 { /* end of list */ }
4357 },
4358 };
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