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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/qdict.h"
39#include "block/throttle-groups.h"
40#include "monitor/monitor.h"
41#include "qemu/error-report.h"
42#include "qemu/option.h"
43#include "qemu/config-file.h"
44#include "qapi/qapi-commands-block.h"
45#include "qapi/qapi-commands-transaction.h"
46#include "qapi/qapi-visit-block-core.h"
47#include "qapi/qmp/qdict.h"
48#include "qapi/qmp/qnum.h"
49#include "qapi/qmp/qstring.h"
50#include "qapi/error.h"
51#include "qapi/qmp/qerror.h"
52#include "qapi/qmp/qlist.h"
53#include "qapi/qobject-output-visitor.h"
54#include "sysemu/sysemu.h"
55#include "sysemu/iothread.h"
56#include "block/block_int.h"
57#include "block/trace.h"
58#include "sysemu/arch_init.h"
59#include "sysemu/qtest.h"
60#include "qemu/cutils.h"
61#include "qemu/help_option.h"
62#include "qemu/throttle-options.h"
63
64static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
65 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
66
67static int do_open_tray(const char *blk_name, const char *qdev_id,
68 bool force, Error **errp);
69static void blockdev_remove_medium(bool has_device, const char *device,
70 bool has_id, const char *id, Error **errp);
71static void blockdev_insert_medium(bool has_device, const char *device,
72 bool has_id, const char *id,
73 const char *node_name, Error **errp);
74
75static const char *const if_name[IF_COUNT] = {
76 [IF_NONE] = "none",
77 [IF_IDE] = "ide",
78 [IF_SCSI] = "scsi",
79 [IF_FLOPPY] = "floppy",
80 [IF_PFLASH] = "pflash",
81 [IF_MTD] = "mtd",
82 [IF_SD] = "sd",
83 [IF_VIRTIO] = "virtio",
84 [IF_XEN] = "xen",
85};
86
87static int if_max_devs[IF_COUNT] = {
88 /*
89 * Do not change these numbers! They govern how drive option
90 * index maps to unit and bus. That mapping is ABI.
91 *
92 * All controllers used to implement if=T drives need to support
93 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
94 * Otherwise, some index values map to "impossible" bus, unit
95 * values.
96 *
97 * For instance, if you change [IF_SCSI] to 255, -drive
98 * if=scsi,index=12 no longer means bus=1,unit=5, but
99 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
100 * the drive can't be set up. Regression.
101 */
102 [IF_IDE] = 2,
103 [IF_SCSI] = 7,
104};
105
106/**
107 * Boards may call this to offer board-by-board overrides
108 * of the default, global values.
109 */
110void override_max_devs(BlockInterfaceType type, int max_devs)
111{
112 BlockBackend *blk;
113 DriveInfo *dinfo;
114
115 if (max_devs <= 0) {
116 return;
117 }
118
119 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
120 dinfo = blk_legacy_dinfo(blk);
121 if (dinfo->type == type) {
122 fprintf(stderr, "Cannot override units-per-bus property of"
123 " the %s interface, because a drive of that type has"
124 " already been added.\n", if_name[type]);
125 g_assert_not_reached();
126 }
127 }
128
129 if_max_devs[type] = max_devs;
130}
131
132/*
133 * We automatically delete the drive when a device using it gets
134 * unplugged. Questionable feature, but we can't just drop it.
135 * Device models call blockdev_mark_auto_del() to schedule the
136 * automatic deletion, and generic qdev code calls blockdev_auto_del()
137 * when deletion is actually safe.
138 */
139void blockdev_mark_auto_del(BlockBackend *blk)
140{
141 DriveInfo *dinfo = blk_legacy_dinfo(blk);
142 BlockDriverState *bs = blk_bs(blk);
143 AioContext *aio_context;
144
145 if (!dinfo) {
146 return;
147 }
148
149 if (bs) {
150 aio_context = bdrv_get_aio_context(bs);
151 aio_context_acquire(aio_context);
152
153 if (bs->job) {
154 job_cancel(&bs->job->job, false);
155 }
156
157 aio_context_release(aio_context);
158 }
159
160 dinfo->auto_del = 1;
161}
162
163void blockdev_auto_del(BlockBackend *blk)
164{
165 DriveInfo *dinfo = blk_legacy_dinfo(blk);
166
167 if (dinfo && dinfo->auto_del) {
168 monitor_remove_blk(blk);
169 blk_unref(blk);
170 }
171}
172
173/**
174 * Returns the current mapping of how many units per bus
175 * a particular interface can support.
176 *
177 * A positive integer indicates n units per bus.
178 * 0 implies the mapping has not been established.
179 * -1 indicates an invalid BlockInterfaceType was given.
180 */
181int drive_get_max_devs(BlockInterfaceType type)
182{
183 if (type >= IF_IDE && type < IF_COUNT) {
184 return if_max_devs[type];
185 }
186
187 return -1;
188}
189
190static int drive_index_to_bus_id(BlockInterfaceType type, int index)
191{
192 int max_devs = if_max_devs[type];
193 return max_devs ? index / max_devs : 0;
194}
195
196static int drive_index_to_unit_id(BlockInterfaceType type, int index)
197{
198 int max_devs = if_max_devs[type];
199 return max_devs ? index % max_devs : index;
200}
201
202QemuOpts *drive_def(const char *optstr)
203{
204 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
205}
206
207QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
208 const char *optstr)
209{
210 QemuOpts *opts;
211
212 opts = drive_def(optstr);
213 if (!opts) {
214 return NULL;
215 }
216 if (type != IF_DEFAULT) {
217 qemu_opt_set(opts, "if", if_name[type], &error_abort);
218 }
219 if (index >= 0) {
220 qemu_opt_set_number(opts, "index", index, &error_abort);
221 }
222 if (file)
223 qemu_opt_set(opts, "file", file, &error_abort);
224 return opts;
225}
226
227DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
228{
229 BlockBackend *blk;
230 DriveInfo *dinfo;
231
232 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
233 dinfo = blk_legacy_dinfo(blk);
234 if (dinfo && dinfo->type == type
235 && dinfo->bus == bus && dinfo->unit == unit) {
236 return dinfo;
237 }
238 }
239
240 return NULL;
241}
242
243void drive_check_orphaned(void)
244{
245 BlockBackend *blk;
246 DriveInfo *dinfo;
247 Location loc;
248 bool orphans = false;
249
250 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
251 dinfo = blk_legacy_dinfo(blk);
252 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
253 dinfo->type != IF_NONE) {
254 loc_push_none(&loc);
255 qemu_opts_loc_restore(dinfo->opts);
256 error_report("machine type does not support"
257 " if=%s,bus=%d,unit=%d",
258 if_name[dinfo->type], dinfo->bus, dinfo->unit);
259 loc_pop(&loc);
260 orphans = true;
261 }
262 }
263
264 if (orphans) {
265 exit(1);
266 }
267}
268
269DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
270{
271 return drive_get(type,
272 drive_index_to_bus_id(type, index),
273 drive_index_to_unit_id(type, index));
274}
275
276int drive_get_max_bus(BlockInterfaceType type)
277{
278 int max_bus;
279 BlockBackend *blk;
280 DriveInfo *dinfo;
281
282 max_bus = -1;
283 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
284 dinfo = blk_legacy_dinfo(blk);
285 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
286 max_bus = dinfo->bus;
287 }
288 }
289 return max_bus;
290}
291
292/* Get a block device. This should only be used for single-drive devices
293 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
294 appropriate bus. */
295DriveInfo *drive_get_next(BlockInterfaceType type)
296{
297 static int next_block_unit[IF_COUNT];
298
299 return drive_get(type, 0, next_block_unit[type]++);
300}
301
302static void bdrv_format_print(void *opaque, const char *name)
303{
304 error_printf(" %s", name);
305}
306
307typedef struct {
308 QEMUBH *bh;
309 BlockDriverState *bs;
310} BDRVPutRefBH;
311
312static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
313{
314 if (!strcmp(buf, "ignore")) {
315 return BLOCKDEV_ON_ERROR_IGNORE;
316 } else if (!is_read && !strcmp(buf, "enospc")) {
317 return BLOCKDEV_ON_ERROR_ENOSPC;
318 } else if (!strcmp(buf, "stop")) {
319 return BLOCKDEV_ON_ERROR_STOP;
320 } else if (!strcmp(buf, "report")) {
321 return BLOCKDEV_ON_ERROR_REPORT;
322 } else {
323 error_setg(errp, "'%s' invalid %s error action",
324 buf, is_read ? "read" : "write");
325 return -1;
326 }
327}
328
329static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
330 Error **errp)
331{
332 const QListEntry *entry;
333 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
334 switch (qobject_type(entry->value)) {
335
336 case QTYPE_QSTRING: {
337 unsigned long long length;
338 const char *str = qstring_get_str(qobject_to(QString,
339 entry->value));
340 if (parse_uint_full(str, &length, 10) == 0 &&
341 length > 0 && length <= UINT_MAX) {
342 block_acct_add_interval(stats, (unsigned) length);
343 } else {
344 error_setg(errp, "Invalid interval length: %s", str);
345 return false;
346 }
347 break;
348 }
349
350 case QTYPE_QNUM: {
351 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
352
353 if (length > 0 && length <= UINT_MAX) {
354 block_acct_add_interval(stats, (unsigned) length);
355 } else {
356 error_setg(errp, "Invalid interval length: %" PRId64, length);
357 return false;
358 }
359 break;
360 }
361
362 default:
363 error_setg(errp, "The specification of stats-intervals is invalid");
364 return false;
365 }
366 }
367 return true;
368}
369
370typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
371
372/* All parameters but @opts are optional and may be set to NULL. */
373static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
374 const char **throttling_group, ThrottleConfig *throttle_cfg,
375 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
376{
377 Error *local_error = NULL;
378 const char *aio;
379
380 if (bdrv_flags) {
381 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
382 *bdrv_flags |= BDRV_O_COPY_ON_READ;
383 }
384
385 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
386 if (!strcmp(aio, "native")) {
387 *bdrv_flags |= BDRV_O_NATIVE_AIO;
388 } else if (!strcmp(aio, "threads")) {
389 /* this is the default */
390 } else {
391 error_setg(errp, "invalid aio option");
392 return;
393 }
394 }
395 }
396
397 /* disk I/O throttling */
398 if (throttling_group) {
399 *throttling_group = qemu_opt_get(opts, "throttling.group");
400 }
401
402 if (throttle_cfg) {
403 throttle_config_init(throttle_cfg);
404 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
405 qemu_opt_get_number(opts, "throttling.bps-total", 0);
406 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
407 qemu_opt_get_number(opts, "throttling.bps-read", 0);
408 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
409 qemu_opt_get_number(opts, "throttling.bps-write", 0);
410 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
411 qemu_opt_get_number(opts, "throttling.iops-total", 0);
412 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
413 qemu_opt_get_number(opts, "throttling.iops-read", 0);
414 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
415 qemu_opt_get_number(opts, "throttling.iops-write", 0);
416
417 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
418 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
419 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
420 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
421 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
422 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
423 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
424 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
425 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
426 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
427 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
428 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
429
430 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
431 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
432 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
433 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
434 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
435 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
436 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
437 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
438 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
439 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
440 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
441 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
442
443 throttle_cfg->op_size =
444 qemu_opt_get_number(opts, "throttling.iops-size", 0);
445
446 if (!throttle_is_valid(throttle_cfg, errp)) {
447 return;
448 }
449 }
450
451 if (detect_zeroes) {
452 *detect_zeroes =
453 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
454 qemu_opt_get(opts, "detect-zeroes"),
455 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
456 &local_error);
457 if (local_error) {
458 error_propagate(errp, local_error);
459 return;
460 }
461 }
462}
463
464/* Takes the ownership of bs_opts */
465static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
466 Error **errp)
467{
468 const char *buf;
469 int bdrv_flags = 0;
470 int on_read_error, on_write_error;
471 bool account_invalid, account_failed;
472 bool writethrough, read_only;
473 BlockBackend *blk;
474 BlockDriverState *bs;
475 ThrottleConfig cfg;
476 int snapshot = 0;
477 Error *error = NULL;
478 QemuOpts *opts;
479 QDict *interval_dict = NULL;
480 QList *interval_list = NULL;
481 const char *id;
482 BlockdevDetectZeroesOptions detect_zeroes =
483 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
484 const char *throttling_group = NULL;
485
486 /* Check common options by copying from bs_opts to opts, all other options
487 * stay in bs_opts for processing by bdrv_open(). */
488 id = qdict_get_try_str(bs_opts, "id");
489 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
490 if (error) {
491 error_propagate(errp, error);
492 goto err_no_opts;
493 }
494
495 qemu_opts_absorb_qdict(opts, bs_opts, &error);
496 if (error) {
497 error_propagate(errp, error);
498 goto early_err;
499 }
500
501 if (id) {
502 qdict_del(bs_opts, "id");
503 }
504
505 /* extract parameters */
506 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
507
508 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
509 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
510
511 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
512
513 id = qemu_opts_id(opts);
514
515 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
516 qdict_array_split(interval_dict, &interval_list);
517
518 if (qdict_size(interval_dict) != 0) {
519 error_setg(errp, "Invalid option stats-intervals.%s",
520 qdict_first(interval_dict)->key);
521 goto early_err;
522 }
523
524 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
525 &detect_zeroes, &error);
526 if (error) {
527 error_propagate(errp, error);
528 goto early_err;
529 }
530
531 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
532 if (is_help_option(buf)) {
533 error_printf("Supported formats:");
534 bdrv_iterate_format(bdrv_format_print, NULL);
535 error_printf("\n");
536 goto early_err;
537 }
538
539 if (qdict_haskey(bs_opts, "driver")) {
540 error_setg(errp, "Cannot specify both 'driver' and 'format'");
541 goto early_err;
542 }
543 qdict_put_str(bs_opts, "driver", buf);
544 }
545
546 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
547 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
548 on_write_error = parse_block_error_action(buf, 0, &error);
549 if (error) {
550 error_propagate(errp, error);
551 goto early_err;
552 }
553 }
554
555 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
556 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
557 on_read_error = parse_block_error_action(buf, 1, &error);
558 if (error) {
559 error_propagate(errp, error);
560 goto early_err;
561 }
562 }
563
564 if (snapshot) {
565 bdrv_flags |= BDRV_O_SNAPSHOT;
566 }
567
568 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
569
570 /* init */
571 if ((!file || !*file) && !qdict_size(bs_opts)) {
572 BlockBackendRootState *blk_rs;
573
574 blk = blk_new(0, BLK_PERM_ALL);
575 blk_rs = blk_get_root_state(blk);
576 blk_rs->open_flags = bdrv_flags;
577 blk_rs->read_only = read_only;
578 blk_rs->detect_zeroes = detect_zeroes;
579
580 qobject_unref(bs_opts);
581 } else {
582 if (file && !*file) {
583 file = NULL;
584 }
585
586 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
587 * with other callers) rather than what we want as the real defaults.
588 * Apply the defaults here instead. */
589 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
590 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
591 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
592 read_only ? "on" : "off");
593 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
594
595 if (runstate_check(RUN_STATE_INMIGRATE)) {
596 bdrv_flags |= BDRV_O_INACTIVE;
597 }
598
599 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
600 if (!blk) {
601 goto err_no_bs_opts;
602 }
603 bs = blk_bs(blk);
604
605 bs->detect_zeroes = detect_zeroes;
606
607 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
608
609 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
610 blk_unref(blk);
611 blk = NULL;
612 goto err_no_bs_opts;
613 }
614 }
615
616 /* disk I/O throttling */
617 if (throttle_enabled(&cfg)) {
618 if (!throttling_group) {
619 throttling_group = id;
620 }
621 blk_io_limits_enable(blk, throttling_group);
622 blk_set_io_limits(blk, &cfg);
623 }
624
625 blk_set_enable_write_cache(blk, !writethrough);
626 blk_set_on_error(blk, on_read_error, on_write_error);
627
628 if (!monitor_add_blk(blk, id, errp)) {
629 blk_unref(blk);
630 blk = NULL;
631 goto err_no_bs_opts;
632 }
633
634err_no_bs_opts:
635 qemu_opts_del(opts);
636 qobject_unref(interval_dict);
637 qobject_unref(interval_list);
638 return blk;
639
640early_err:
641 qemu_opts_del(opts);
642 qobject_unref(interval_dict);
643 qobject_unref(interval_list);
644err_no_opts:
645 qobject_unref(bs_opts);
646 return NULL;
647}
648
649/* Takes the ownership of bs_opts */
650static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
651{
652 int bdrv_flags = 0;
653
654 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
655 * with other callers) rather than what we want as the real defaults.
656 * Apply the defaults here instead. */
657 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
658 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
659 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
660
661 if (runstate_check(RUN_STATE_INMIGRATE)) {
662 bdrv_flags |= BDRV_O_INACTIVE;
663 }
664
665 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
666}
667
668void blockdev_close_all_bdrv_states(void)
669{
670 BlockDriverState *bs, *next_bs;
671
672 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
673 AioContext *ctx = bdrv_get_aio_context(bs);
674
675 aio_context_acquire(ctx);
676 bdrv_unref(bs);
677 aio_context_release(ctx);
678 }
679}
680
681/* Iterates over the list of monitor-owned BlockDriverStates */
682BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
683{
684 return bs ? QTAILQ_NEXT(bs, monitor_list)
685 : QTAILQ_FIRST(&monitor_bdrv_states);
686}
687
688static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
689 Error **errp)
690{
691 const char *value;
692
693 value = qemu_opt_get(opts, from);
694 if (value) {
695 if (qemu_opt_find(opts, to)) {
696 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
697 "same time", to, from);
698 return;
699 }
700 }
701
702 /* rename all items in opts */
703 while ((value = qemu_opt_get(opts, from))) {
704 qemu_opt_set(opts, to, value, &error_abort);
705 qemu_opt_unset(opts, from);
706 }
707}
708
709QemuOptsList qemu_legacy_drive_opts = {
710 .name = "drive",
711 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
712 .desc = {
713 {
714 .name = "bus",
715 .type = QEMU_OPT_NUMBER,
716 .help = "bus number",
717 },{
718 .name = "unit",
719 .type = QEMU_OPT_NUMBER,
720 .help = "unit number (i.e. lun for scsi)",
721 },{
722 .name = "index",
723 .type = QEMU_OPT_NUMBER,
724 .help = "index number",
725 },{
726 .name = "media",
727 .type = QEMU_OPT_STRING,
728 .help = "media type (disk, cdrom)",
729 },{
730 .name = "if",
731 .type = QEMU_OPT_STRING,
732 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
733 },{
734 .name = "file",
735 .type = QEMU_OPT_STRING,
736 .help = "file name",
737 },
738
739 /* Options that are passed on, but have special semantics with -drive */
740 {
741 .name = BDRV_OPT_READ_ONLY,
742 .type = QEMU_OPT_BOOL,
743 .help = "open drive file as read-only",
744 },{
745 .name = "rerror",
746 .type = QEMU_OPT_STRING,
747 .help = "read error action",
748 },{
749 .name = "werror",
750 .type = QEMU_OPT_STRING,
751 .help = "write error action",
752 },{
753 .name = "copy-on-read",
754 .type = QEMU_OPT_BOOL,
755 .help = "copy read data from backing file into image file",
756 },
757
758 { /* end of list */ }
759 },
760};
761
762DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
763 Error **errp)
764{
765 const char *value;
766 BlockBackend *blk;
767 DriveInfo *dinfo = NULL;
768 QDict *bs_opts;
769 QemuOpts *legacy_opts;
770 DriveMediaType media = MEDIA_DISK;
771 BlockInterfaceType type;
772 int max_devs, bus_id, unit_id, index;
773 const char *werror, *rerror;
774 bool read_only = false;
775 bool copy_on_read;
776 const char *filename;
777 Error *local_err = NULL;
778 int i;
779
780 /* Change legacy command line options into QMP ones */
781 static const struct {
782 const char *from;
783 const char *to;
784 } opt_renames[] = {
785 { "iops", "throttling.iops-total" },
786 { "iops_rd", "throttling.iops-read" },
787 { "iops_wr", "throttling.iops-write" },
788
789 { "bps", "throttling.bps-total" },
790 { "bps_rd", "throttling.bps-read" },
791 { "bps_wr", "throttling.bps-write" },
792
793 { "iops_max", "throttling.iops-total-max" },
794 { "iops_rd_max", "throttling.iops-read-max" },
795 { "iops_wr_max", "throttling.iops-write-max" },
796
797 { "bps_max", "throttling.bps-total-max" },
798 { "bps_rd_max", "throttling.bps-read-max" },
799 { "bps_wr_max", "throttling.bps-write-max" },
800
801 { "iops_size", "throttling.iops-size" },
802
803 { "group", "throttling.group" },
804
805 { "readonly", BDRV_OPT_READ_ONLY },
806 };
807
808 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
809 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
810 &local_err);
811 if (local_err) {
812 error_propagate(errp, local_err);
813 return NULL;
814 }
815 }
816
817 value = qemu_opt_get(all_opts, "cache");
818 if (value) {
819 int flags = 0;
820 bool writethrough;
821
822 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
823 error_setg(errp, "invalid cache option");
824 return NULL;
825 }
826
827 /* Specific options take precedence */
828 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
829 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
830 !writethrough, &error_abort);
831 }
832 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
833 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
834 !!(flags & BDRV_O_NOCACHE), &error_abort);
835 }
836 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
837 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
838 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
839 }
840 qemu_opt_unset(all_opts, "cache");
841 }
842
843 /* Get a QDict for processing the options */
844 bs_opts = qdict_new();
845 qemu_opts_to_qdict(all_opts, bs_opts);
846
847 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
848 &error_abort);
849 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
850 if (local_err) {
851 error_propagate(errp, local_err);
852 goto fail;
853 }
854
855 /* Media type */
856 value = qemu_opt_get(legacy_opts, "media");
857 if (value) {
858 if (!strcmp(value, "disk")) {
859 media = MEDIA_DISK;
860 } else if (!strcmp(value, "cdrom")) {
861 media = MEDIA_CDROM;
862 read_only = true;
863 } else {
864 error_setg(errp, "'%s' invalid media", value);
865 goto fail;
866 }
867 }
868
869 /* copy-on-read is disabled with a warning for read-only devices */
870 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
871 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
872
873 if (read_only && copy_on_read) {
874 warn_report("disabling copy-on-read on read-only drive");
875 copy_on_read = false;
876 }
877
878 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
879 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
880
881 /* Controller type */
882 value = qemu_opt_get(legacy_opts, "if");
883 if (value) {
884 for (type = 0;
885 type < IF_COUNT && strcmp(value, if_name[type]);
886 type++) {
887 }
888 if (type == IF_COUNT) {
889 error_setg(errp, "unsupported bus type '%s'", value);
890 goto fail;
891 }
892 } else {
893 type = block_default_type;
894 }
895
896 /* Device address specified by bus/unit or index.
897 * If none was specified, try to find the first free one. */
898 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
899 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
900 index = qemu_opt_get_number(legacy_opts, "index", -1);
901
902 max_devs = if_max_devs[type];
903
904 if (index != -1) {
905 if (bus_id != 0 || unit_id != -1) {
906 error_setg(errp, "index cannot be used with bus and unit");
907 goto fail;
908 }
909 bus_id = drive_index_to_bus_id(type, index);
910 unit_id = drive_index_to_unit_id(type, index);
911 }
912
913 if (unit_id == -1) {
914 unit_id = 0;
915 while (drive_get(type, bus_id, unit_id) != NULL) {
916 unit_id++;
917 if (max_devs && unit_id >= max_devs) {
918 unit_id -= max_devs;
919 bus_id++;
920 }
921 }
922 }
923
924 if (max_devs && unit_id >= max_devs) {
925 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
926 goto fail;
927 }
928
929 if (drive_get(type, bus_id, unit_id) != NULL) {
930 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
931 bus_id, unit_id, index);
932 goto fail;
933 }
934
935 /* no id supplied -> create one */
936 if (qemu_opts_id(all_opts) == NULL) {
937 char *new_id;
938 const char *mediastr = "";
939 if (type == IF_IDE || type == IF_SCSI) {
940 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
941 }
942 if (max_devs) {
943 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
944 mediastr, unit_id);
945 } else {
946 new_id = g_strdup_printf("%s%s%i", if_name[type],
947 mediastr, unit_id);
948 }
949 qdict_put_str(bs_opts, "id", new_id);
950 g_free(new_id);
951 }
952
953 /* Add virtio block device */
954 if (type == IF_VIRTIO) {
955 QemuOpts *devopts;
956 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
957 &error_abort);
958 if (arch_type == QEMU_ARCH_S390X) {
959 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
960 } else {
961 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
962 }
963 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
964 &error_abort);
965 }
966
967 filename = qemu_opt_get(legacy_opts, "file");
968
969 /* Check werror/rerror compatibility with if=... */
970 werror = qemu_opt_get(legacy_opts, "werror");
971 if (werror != NULL) {
972 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
973 type != IF_NONE) {
974 error_setg(errp, "werror is not supported by this bus type");
975 goto fail;
976 }
977 qdict_put_str(bs_opts, "werror", werror);
978 }
979
980 rerror = qemu_opt_get(legacy_opts, "rerror");
981 if (rerror != NULL) {
982 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
983 type != IF_NONE) {
984 error_setg(errp, "rerror is not supported by this bus type");
985 goto fail;
986 }
987 qdict_put_str(bs_opts, "rerror", rerror);
988 }
989
990 /* Actual block device init: Functionality shared with blockdev-add */
991 blk = blockdev_init(filename, bs_opts, &local_err);
992 bs_opts = NULL;
993 if (!blk) {
994 if (local_err) {
995 error_propagate(errp, local_err);
996 }
997 goto fail;
998 } else {
999 assert(!local_err);
1000 }
1001
1002 /* Create legacy DriveInfo */
1003 dinfo = g_malloc0(sizeof(*dinfo));
1004 dinfo->opts = all_opts;
1005
1006 dinfo->type = type;
1007 dinfo->bus = bus_id;
1008 dinfo->unit = unit_id;
1009
1010 blk_set_legacy_dinfo(blk, dinfo);
1011
1012 switch(type) {
1013 case IF_IDE:
1014 case IF_SCSI:
1015 case IF_XEN:
1016 case IF_NONE:
1017 dinfo->media_cd = media == MEDIA_CDROM;
1018 break;
1019 default:
1020 break;
1021 }
1022
1023fail:
1024 qemu_opts_del(legacy_opts);
1025 qobject_unref(bs_opts);
1026 return dinfo;
1027}
1028
1029static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1030{
1031 BlockDriverState *bs;
1032
1033 bs = bdrv_lookup_bs(name, name, errp);
1034 if (bs == NULL) {
1035 return NULL;
1036 }
1037
1038 if (!bdrv_is_root_node(bs)) {
1039 error_setg(errp, "Need a root block node");
1040 return NULL;
1041 }
1042
1043 if (!bdrv_is_inserted(bs)) {
1044 error_setg(errp, "Device has no medium");
1045 return NULL;
1046 }
1047
1048 return bs;
1049}
1050
1051static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id,
1052 Error **errp)
1053{
1054 BlockBackend *blk;
1055
1056 if (!blk_name == !qdev_id) {
1057 error_setg(errp, "Need exactly one of 'device' and 'id'");
1058 return NULL;
1059 }
1060
1061 if (qdev_id) {
1062 blk = blk_by_qdev_id(qdev_id, errp);
1063 } else {
1064 blk = blk_by_name(blk_name);
1065 if (blk == NULL) {
1066 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1067 "Device '%s' not found", blk_name);
1068 }
1069 }
1070
1071 return blk;
1072}
1073
1074void hmp_commit(Monitor *mon, const QDict *qdict)
1075{
1076 const char *device = qdict_get_str(qdict, "device");
1077 BlockBackend *blk;
1078 int ret;
1079
1080 if (!strcmp(device, "all")) {
1081 ret = blk_commit_all();
1082 } else {
1083 BlockDriverState *bs;
1084 AioContext *aio_context;
1085
1086 blk = blk_by_name(device);
1087 if (!blk) {
1088 monitor_printf(mon, "Device '%s' not found\n", device);
1089 return;
1090 }
1091 if (!blk_is_available(blk)) {
1092 monitor_printf(mon, "Device '%s' has no medium\n", device);
1093 return;
1094 }
1095
1096 bs = blk_bs(blk);
1097 aio_context = bdrv_get_aio_context(bs);
1098 aio_context_acquire(aio_context);
1099
1100 ret = bdrv_commit(bs);
1101
1102 aio_context_release(aio_context);
1103 }
1104 if (ret < 0) {
1105 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1106 strerror(-ret));
1107 }
1108}
1109
1110static void blockdev_do_action(TransactionAction *action, Error **errp)
1111{
1112 TransactionActionList list;
1113
1114 list.value = action;
1115 list.next = NULL;
1116 qmp_transaction(&list, false, NULL, errp);
1117}
1118
1119void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1120 bool has_node_name, const char *node_name,
1121 const char *snapshot_file,
1122 bool has_snapshot_node_name,
1123 const char *snapshot_node_name,
1124 bool has_format, const char *format,
1125 bool has_mode, NewImageMode mode, Error **errp)
1126{
1127 BlockdevSnapshotSync snapshot = {
1128 .has_device = has_device,
1129 .device = (char *) device,
1130 .has_node_name = has_node_name,
1131 .node_name = (char *) node_name,
1132 .snapshot_file = (char *) snapshot_file,
1133 .has_snapshot_node_name = has_snapshot_node_name,
1134 .snapshot_node_name = (char *) snapshot_node_name,
1135 .has_format = has_format,
1136 .format = (char *) format,
1137 .has_mode = has_mode,
1138 .mode = mode,
1139 };
1140 TransactionAction action = {
1141 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1142 .u.blockdev_snapshot_sync.data = &snapshot,
1143 };
1144 blockdev_do_action(&action, errp);
1145}
1146
1147void qmp_blockdev_snapshot(const char *node, const char *overlay,
1148 Error **errp)
1149{
1150 BlockdevSnapshot snapshot_data = {
1151 .node = (char *) node,
1152 .overlay = (char *) overlay
1153 };
1154 TransactionAction action = {
1155 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1156 .u.blockdev_snapshot.data = &snapshot_data,
1157 };
1158 blockdev_do_action(&action, errp);
1159}
1160
1161void qmp_blockdev_snapshot_internal_sync(const char *device,
1162 const char *name,
1163 Error **errp)
1164{
1165 BlockdevSnapshotInternal snapshot = {
1166 .device = (char *) device,
1167 .name = (char *) name
1168 };
1169 TransactionAction action = {
1170 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1171 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1172 };
1173 blockdev_do_action(&action, errp);
1174}
1175
1176SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1177 bool has_id,
1178 const char *id,
1179 bool has_name,
1180 const char *name,
1181 Error **errp)
1182{
1183 BlockDriverState *bs;
1184 AioContext *aio_context;
1185 QEMUSnapshotInfo sn;
1186 Error *local_err = NULL;
1187 SnapshotInfo *info = NULL;
1188 int ret;
1189
1190 bs = qmp_get_root_bs(device, errp);
1191 if (!bs) {
1192 return NULL;
1193 }
1194 aio_context = bdrv_get_aio_context(bs);
1195 aio_context_acquire(aio_context);
1196
1197 if (!has_id) {
1198 id = NULL;
1199 }
1200
1201 if (!has_name) {
1202 name = NULL;
1203 }
1204
1205 if (!id && !name) {
1206 error_setg(errp, "Name or id must be provided");
1207 goto out_aio_context;
1208 }
1209
1210 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1211 goto out_aio_context;
1212 }
1213
1214 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1215 if (local_err) {
1216 error_propagate(errp, local_err);
1217 goto out_aio_context;
1218 }
1219 if (!ret) {
1220 error_setg(errp,
1221 "Snapshot with id '%s' and name '%s' does not exist on "
1222 "device '%s'",
1223 STR_OR_NULL(id), STR_OR_NULL(name), device);
1224 goto out_aio_context;
1225 }
1226
1227 bdrv_snapshot_delete(bs, id, name, &local_err);
1228 if (local_err) {
1229 error_propagate(errp, local_err);
1230 goto out_aio_context;
1231 }
1232
1233 aio_context_release(aio_context);
1234
1235 info = g_new0(SnapshotInfo, 1);
1236 info->id = g_strdup(sn.id_str);
1237 info->name = g_strdup(sn.name);
1238 info->date_nsec = sn.date_nsec;
1239 info->date_sec = sn.date_sec;
1240 info->vm_state_size = sn.vm_state_size;
1241 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1242 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1243
1244 return info;
1245
1246out_aio_context:
1247 aio_context_release(aio_context);
1248 return NULL;
1249}
1250
1251/**
1252 * block_dirty_bitmap_lookup:
1253 * Return a dirty bitmap (if present), after validating
1254 * the node reference and bitmap names.
1255 *
1256 * @node: The name of the BDS node to search for bitmaps
1257 * @name: The name of the bitmap to search for
1258 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1259 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1260 * @errp: Output pointer for error information. Can be NULL.
1261 *
1262 * @return: A bitmap object on success, or NULL on failure.
1263 */
1264static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1265 const char *name,
1266 BlockDriverState **pbs,
1267 Error **errp)
1268{
1269 BlockDriverState *bs;
1270 BdrvDirtyBitmap *bitmap;
1271
1272 if (!node) {
1273 error_setg(errp, "Node cannot be NULL");
1274 return NULL;
1275 }
1276 if (!name) {
1277 error_setg(errp, "Bitmap name cannot be NULL");
1278 return NULL;
1279 }
1280 bs = bdrv_lookup_bs(node, node, NULL);
1281 if (!bs) {
1282 error_setg(errp, "Node '%s' not found", node);
1283 return NULL;
1284 }
1285
1286 bitmap = bdrv_find_dirty_bitmap(bs, name);
1287 if (!bitmap) {
1288 error_setg(errp, "Dirty bitmap '%s' not found", name);
1289 return NULL;
1290 }
1291
1292 if (pbs) {
1293 *pbs = bs;
1294 }
1295
1296 return bitmap;
1297}
1298
1299/* New and old BlockDriverState structs for atomic group operations */
1300
1301typedef struct BlkActionState BlkActionState;
1302
1303/**
1304 * BlkActionOps:
1305 * Table of operations that define an Action.
1306 *
1307 * @instance_size: Size of state struct, in bytes.
1308 * @prepare: Prepare the work, must NOT be NULL.
1309 * @commit: Commit the changes, can be NULL.
1310 * @abort: Abort the changes on fail, can be NULL.
1311 * @clean: Clean up resources after all transaction actions have called
1312 * commit() or abort(). Can be NULL.
1313 *
1314 * Only prepare() may fail. In a single transaction, only one of commit() or
1315 * abort() will be called. clean() will always be called if it is present.
1316 */
1317typedef struct BlkActionOps {
1318 size_t instance_size;
1319 void (*prepare)(BlkActionState *common, Error **errp);
1320 void (*commit)(BlkActionState *common);
1321 void (*abort)(BlkActionState *common);
1322 void (*clean)(BlkActionState *common);
1323} BlkActionOps;
1324
1325/**
1326 * BlkActionState:
1327 * Describes one Action's state within a Transaction.
1328 *
1329 * @action: QAPI-defined enum identifying which Action to perform.
1330 * @ops: Table of ActionOps this Action can perform.
1331 * @block_job_txn: Transaction which this action belongs to.
1332 * @entry: List membership for all Actions in this Transaction.
1333 *
1334 * This structure must be arranged as first member in a subclassed type,
1335 * assuming that the compiler will also arrange it to the same offsets as the
1336 * base class.
1337 */
1338struct BlkActionState {
1339 TransactionAction *action;
1340 const BlkActionOps *ops;
1341 JobTxn *block_job_txn;
1342 TransactionProperties *txn_props;
1343 QSIMPLEQ_ENTRY(BlkActionState) entry;
1344};
1345
1346/* internal snapshot private data */
1347typedef struct InternalSnapshotState {
1348 BlkActionState common;
1349 BlockDriverState *bs;
1350 QEMUSnapshotInfo sn;
1351 bool created;
1352} InternalSnapshotState;
1353
1354
1355static int action_check_completion_mode(BlkActionState *s, Error **errp)
1356{
1357 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1358 error_setg(errp,
1359 "Action '%s' does not support Transaction property "
1360 "completion-mode = %s",
1361 TransactionActionKind_str(s->action->type),
1362 ActionCompletionMode_str(s->txn_props->completion_mode));
1363 return -1;
1364 }
1365 return 0;
1366}
1367
1368static void internal_snapshot_prepare(BlkActionState *common,
1369 Error **errp)
1370{
1371 Error *local_err = NULL;
1372 const char *device;
1373 const char *name;
1374 BlockDriverState *bs;
1375 QEMUSnapshotInfo old_sn, *sn;
1376 bool ret;
1377 qemu_timeval tv;
1378 BlockdevSnapshotInternal *internal;
1379 InternalSnapshotState *state;
1380 AioContext *aio_context;
1381 int ret1;
1382
1383 g_assert(common->action->type ==
1384 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1385 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1386 state = DO_UPCAST(InternalSnapshotState, common, common);
1387
1388 /* 1. parse input */
1389 device = internal->device;
1390 name = internal->name;
1391
1392 /* 2. check for validation */
1393 if (action_check_completion_mode(common, errp) < 0) {
1394 return;
1395 }
1396
1397 bs = qmp_get_root_bs(device, errp);
1398 if (!bs) {
1399 return;
1400 }
1401
1402 aio_context = bdrv_get_aio_context(bs);
1403 aio_context_acquire(aio_context);
1404
1405 state->bs = bs;
1406
1407 /* Paired with .clean() */
1408 bdrv_drained_begin(bs);
1409
1410 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1411 goto out;
1412 }
1413
1414 if (bdrv_is_read_only(bs)) {
1415 error_setg(errp, "Device '%s' is read only", device);
1416 goto out;
1417 }
1418
1419 if (!bdrv_can_snapshot(bs)) {
1420 error_setg(errp, "Block format '%s' used by device '%s' "
1421 "does not support internal snapshots",
1422 bs->drv->format_name, device);
1423 goto out;
1424 }
1425
1426 if (!strlen(name)) {
1427 error_setg(errp, "Name is empty");
1428 goto out;
1429 }
1430
1431 /* check whether a snapshot with name exist */
1432 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1433 &local_err);
1434 if (local_err) {
1435 error_propagate(errp, local_err);
1436 goto out;
1437 } else if (ret) {
1438 error_setg(errp,
1439 "Snapshot with name '%s' already exists on device '%s'",
1440 name, device);
1441 goto out;
1442 }
1443
1444 /* 3. take the snapshot */
1445 sn = &state->sn;
1446 pstrcpy(sn->name, sizeof(sn->name), name);
1447 qemu_gettimeofday(&tv);
1448 sn->date_sec = tv.tv_sec;
1449 sn->date_nsec = tv.tv_usec * 1000;
1450 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1451
1452 ret1 = bdrv_snapshot_create(bs, sn);
1453 if (ret1 < 0) {
1454 error_setg_errno(errp, -ret1,
1455 "Failed to create snapshot '%s' on device '%s'",
1456 name, device);
1457 goto out;
1458 }
1459
1460 /* 4. succeed, mark a snapshot is created */
1461 state->created = true;
1462
1463out:
1464 aio_context_release(aio_context);
1465}
1466
1467static void internal_snapshot_abort(BlkActionState *common)
1468{
1469 InternalSnapshotState *state =
1470 DO_UPCAST(InternalSnapshotState, common, common);
1471 BlockDriverState *bs = state->bs;
1472 QEMUSnapshotInfo *sn = &state->sn;
1473 AioContext *aio_context;
1474 Error *local_error = NULL;
1475
1476 if (!state->created) {
1477 return;
1478 }
1479
1480 aio_context = bdrv_get_aio_context(state->bs);
1481 aio_context_acquire(aio_context);
1482
1483 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1484 error_reportf_err(local_error,
1485 "Failed to delete snapshot with id '%s' and "
1486 "name '%s' on device '%s' in abort: ",
1487 sn->id_str, sn->name,
1488 bdrv_get_device_name(bs));
1489 }
1490
1491 aio_context_release(aio_context);
1492}
1493
1494static void internal_snapshot_clean(BlkActionState *common)
1495{
1496 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1497 common, common);
1498 AioContext *aio_context;
1499
1500 if (!state->bs) {
1501 return;
1502 }
1503
1504 aio_context = bdrv_get_aio_context(state->bs);
1505 aio_context_acquire(aio_context);
1506
1507 bdrv_drained_end(state->bs);
1508
1509 aio_context_release(aio_context);
1510}
1511
1512/* external snapshot private data */
1513typedef struct ExternalSnapshotState {
1514 BlkActionState common;
1515 BlockDriverState *old_bs;
1516 BlockDriverState *new_bs;
1517 bool overlay_appended;
1518} ExternalSnapshotState;
1519
1520static void external_snapshot_prepare(BlkActionState *common,
1521 Error **errp)
1522{
1523 int flags = 0;
1524 QDict *options = NULL;
1525 Error *local_err = NULL;
1526 /* Device and node name of the image to generate the snapshot from */
1527 const char *device;
1528 const char *node_name;
1529 /* Reference to the new image (for 'blockdev-snapshot') */
1530 const char *snapshot_ref;
1531 /* File name of the new image (for 'blockdev-snapshot-sync') */
1532 const char *new_image_file;
1533 ExternalSnapshotState *state =
1534 DO_UPCAST(ExternalSnapshotState, common, common);
1535 TransactionAction *action = common->action;
1536 AioContext *aio_context;
1537
1538 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1539 * purpose but a different set of parameters */
1540 switch (action->type) {
1541 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1542 {
1543 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1544 device = s->node;
1545 node_name = s->node;
1546 new_image_file = NULL;
1547 snapshot_ref = s->overlay;
1548 }
1549 break;
1550 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1551 {
1552 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1553 device = s->has_device ? s->device : NULL;
1554 node_name = s->has_node_name ? s->node_name : NULL;
1555 new_image_file = s->snapshot_file;
1556 snapshot_ref = NULL;
1557 }
1558 break;
1559 default:
1560 g_assert_not_reached();
1561 }
1562
1563 /* start processing */
1564 if (action_check_completion_mode(common, errp) < 0) {
1565 return;
1566 }
1567
1568 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1569 if (!state->old_bs) {
1570 return;
1571 }
1572
1573 aio_context = bdrv_get_aio_context(state->old_bs);
1574 aio_context_acquire(aio_context);
1575
1576 /* Paired with .clean() */
1577 bdrv_drained_begin(state->old_bs);
1578
1579 if (!bdrv_is_inserted(state->old_bs)) {
1580 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1581 goto out;
1582 }
1583
1584 if (bdrv_op_is_blocked(state->old_bs,
1585 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1586 goto out;
1587 }
1588
1589 if (!bdrv_is_read_only(state->old_bs)) {
1590 if (bdrv_flush(state->old_bs)) {
1591 error_setg(errp, QERR_IO_ERROR);
1592 goto out;
1593 }
1594 }
1595
1596 if (!bdrv_is_first_non_filter(state->old_bs)) {
1597 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1598 goto out;
1599 }
1600
1601 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1602 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1603 const char *format = s->has_format ? s->format : "qcow2";
1604 enum NewImageMode mode;
1605 const char *snapshot_node_name =
1606 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1607
1608 if (node_name && !snapshot_node_name) {
1609 error_setg(errp, "New snapshot node name missing");
1610 goto out;
1611 }
1612
1613 if (snapshot_node_name &&
1614 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1615 error_setg(errp, "New snapshot node name already in use");
1616 goto out;
1617 }
1618
1619 flags = state->old_bs->open_flags;
1620 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1621 flags |= BDRV_O_NO_BACKING;
1622
1623 /* create new image w/backing file */
1624 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1625 if (mode != NEW_IMAGE_MODE_EXISTING) {
1626 int64_t size = bdrv_getlength(state->old_bs);
1627 if (size < 0) {
1628 error_setg_errno(errp, -size, "bdrv_getlength failed");
1629 goto out;
1630 }
1631 bdrv_img_create(new_image_file, format,
1632 state->old_bs->filename,
1633 state->old_bs->drv->format_name,
1634 NULL, size, flags, false, &local_err);
1635 if (local_err) {
1636 error_propagate(errp, local_err);
1637 goto out;
1638 }
1639 }
1640
1641 options = qdict_new();
1642 if (s->has_snapshot_node_name) {
1643 qdict_put_str(options, "node-name", snapshot_node_name);
1644 }
1645 qdict_put_str(options, "driver", format);
1646 }
1647
1648 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1649 errp);
1650 /* We will manually add the backing_hd field to the bs later */
1651 if (!state->new_bs) {
1652 goto out;
1653 }
1654
1655 if (bdrv_has_blk(state->new_bs)) {
1656 error_setg(errp, "The snapshot is already in use");
1657 goto out;
1658 }
1659
1660 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1661 errp)) {
1662 goto out;
1663 }
1664
1665 if (state->new_bs->backing != NULL) {
1666 error_setg(errp, "The snapshot already has a backing image");
1667 goto out;
1668 }
1669
1670 if (!state->new_bs->drv->supports_backing) {
1671 error_setg(errp, "The snapshot does not support backing images");
1672 goto out;
1673 }
1674
1675 bdrv_set_aio_context(state->new_bs, aio_context);
1676
1677 /* This removes our old bs and adds the new bs. This is an operation that
1678 * can fail, so we need to do it in .prepare; undoing it for abort is
1679 * always possible. */
1680 bdrv_ref(state->new_bs);
1681 bdrv_append(state->new_bs, state->old_bs, &local_err);
1682 if (local_err) {
1683 error_propagate(errp, local_err);
1684 goto out;
1685 }
1686 state->overlay_appended = true;
1687
1688out:
1689 aio_context_release(aio_context);
1690}
1691
1692static void external_snapshot_commit(BlkActionState *common)
1693{
1694 ExternalSnapshotState *state =
1695 DO_UPCAST(ExternalSnapshotState, common, common);
1696 AioContext *aio_context;
1697
1698 aio_context = bdrv_get_aio_context(state->old_bs);
1699 aio_context_acquire(aio_context);
1700
1701 /* We don't need (or want) to use the transactional
1702 * bdrv_reopen_multiple() across all the entries at once, because we
1703 * don't want to abort all of them if one of them fails the reopen */
1704 if (!atomic_read(&state->old_bs->copy_on_read)) {
1705 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1706 NULL);
1707 }
1708
1709 aio_context_release(aio_context);
1710}
1711
1712static void external_snapshot_abort(BlkActionState *common)
1713{
1714 ExternalSnapshotState *state =
1715 DO_UPCAST(ExternalSnapshotState, common, common);
1716 if (state->new_bs) {
1717 if (state->overlay_appended) {
1718 AioContext *aio_context;
1719
1720 aio_context = bdrv_get_aio_context(state->old_bs);
1721 aio_context_acquire(aio_context);
1722
1723 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1724 close state->old_bs; we need it */
1725 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1726 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1727 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1728
1729 aio_context_release(aio_context);
1730 }
1731 }
1732}
1733
1734static void external_snapshot_clean(BlkActionState *common)
1735{
1736 ExternalSnapshotState *state =
1737 DO_UPCAST(ExternalSnapshotState, common, common);
1738 AioContext *aio_context;
1739
1740 if (!state->old_bs) {
1741 return;
1742 }
1743
1744 aio_context = bdrv_get_aio_context(state->old_bs);
1745 aio_context_acquire(aio_context);
1746
1747 bdrv_drained_end(state->old_bs);
1748 bdrv_unref(state->new_bs);
1749
1750 aio_context_release(aio_context);
1751}
1752
1753typedef struct DriveBackupState {
1754 BlkActionState common;
1755 BlockDriverState *bs;
1756 BlockJob *job;
1757} DriveBackupState;
1758
1759static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
1760 Error **errp);
1761
1762static void drive_backup_prepare(BlkActionState *common, Error **errp)
1763{
1764 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1765 BlockDriverState *bs;
1766 DriveBackup *backup;
1767 AioContext *aio_context;
1768 Error *local_err = NULL;
1769
1770 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1771 backup = common->action->u.drive_backup.data;
1772
1773 bs = qmp_get_root_bs(backup->device, errp);
1774 if (!bs) {
1775 return;
1776 }
1777
1778 aio_context = bdrv_get_aio_context(bs);
1779 aio_context_acquire(aio_context);
1780
1781 /* Paired with .clean() */
1782 bdrv_drained_begin(bs);
1783
1784 state->bs = bs;
1785
1786 state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
1787 if (local_err) {
1788 error_propagate(errp, local_err);
1789 goto out;
1790 }
1791
1792out:
1793 aio_context_release(aio_context);
1794}
1795
1796static void drive_backup_commit(BlkActionState *common)
1797{
1798 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1799 AioContext *aio_context;
1800
1801 aio_context = bdrv_get_aio_context(state->bs);
1802 aio_context_acquire(aio_context);
1803
1804 assert(state->job);
1805 job_start(&state->job->job);
1806
1807 aio_context_release(aio_context);
1808}
1809
1810static void drive_backup_abort(BlkActionState *common)
1811{
1812 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1813
1814 if (state->job) {
1815 AioContext *aio_context;
1816
1817 aio_context = bdrv_get_aio_context(state->bs);
1818 aio_context_acquire(aio_context);
1819
1820 job_cancel_sync(&state->job->job);
1821
1822 aio_context_release(aio_context);
1823 }
1824}
1825
1826static void drive_backup_clean(BlkActionState *common)
1827{
1828 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1829 AioContext *aio_context;
1830
1831 if (!state->bs) {
1832 return;
1833 }
1834
1835 aio_context = bdrv_get_aio_context(state->bs);
1836 aio_context_acquire(aio_context);
1837
1838 bdrv_drained_end(state->bs);
1839
1840 aio_context_release(aio_context);
1841}
1842
1843typedef struct BlockdevBackupState {
1844 BlkActionState common;
1845 BlockDriverState *bs;
1846 BlockJob *job;
1847} BlockdevBackupState;
1848
1849static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
1850 Error **errp);
1851
1852static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1853{
1854 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1855 BlockdevBackup *backup;
1856 BlockDriverState *bs, *target;
1857 AioContext *aio_context;
1858 Error *local_err = NULL;
1859
1860 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1861 backup = common->action->u.blockdev_backup.data;
1862
1863 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1864 if (!bs) {
1865 return;
1866 }
1867
1868 target = bdrv_lookup_bs(backup->target, backup->target, errp);
1869 if (!target) {
1870 return;
1871 }
1872
1873 aio_context = bdrv_get_aio_context(bs);
1874 if (aio_context != bdrv_get_aio_context(target)) {
1875 error_setg(errp, "Backup between two IO threads is not implemented");
1876 return;
1877 }
1878 aio_context_acquire(aio_context);
1879 state->bs = bs;
1880
1881 /* Paired with .clean() */
1882 bdrv_drained_begin(state->bs);
1883
1884 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
1885 if (local_err) {
1886 error_propagate(errp, local_err);
1887 goto out;
1888 }
1889
1890out:
1891 aio_context_release(aio_context);
1892}
1893
1894static void blockdev_backup_commit(BlkActionState *common)
1895{
1896 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1897 AioContext *aio_context;
1898
1899 aio_context = bdrv_get_aio_context(state->bs);
1900 aio_context_acquire(aio_context);
1901
1902 assert(state->job);
1903 job_start(&state->job->job);
1904
1905 aio_context_release(aio_context);
1906}
1907
1908static void blockdev_backup_abort(BlkActionState *common)
1909{
1910 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1911
1912 if (state->job) {
1913 AioContext *aio_context;
1914
1915 aio_context = bdrv_get_aio_context(state->bs);
1916 aio_context_acquire(aio_context);
1917
1918 job_cancel_sync(&state->job->job);
1919
1920 aio_context_release(aio_context);
1921 }
1922}
1923
1924static void blockdev_backup_clean(BlkActionState *common)
1925{
1926 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1927 AioContext *aio_context;
1928
1929 if (!state->bs) {
1930 return;
1931 }
1932
1933 aio_context = bdrv_get_aio_context(state->bs);
1934 aio_context_acquire(aio_context);
1935
1936 bdrv_drained_end(state->bs);
1937
1938 aio_context_release(aio_context);
1939}
1940
1941typedef struct BlockDirtyBitmapState {
1942 BlkActionState common;
1943 BdrvDirtyBitmap *bitmap;
1944 BlockDriverState *bs;
1945 HBitmap *backup;
1946 bool prepared;
1947 bool was_enabled;
1948} BlockDirtyBitmapState;
1949
1950static void block_dirty_bitmap_add_prepare(BlkActionState *common,
1951 Error **errp)
1952{
1953 Error *local_err = NULL;
1954 BlockDirtyBitmapAdd *action;
1955 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1956 common, common);
1957
1958 if (action_check_completion_mode(common, errp) < 0) {
1959 return;
1960 }
1961
1962 action = common->action->u.block_dirty_bitmap_add.data;
1963 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1964 qmp_block_dirty_bitmap_add(action->node, action->name,
1965 action->has_granularity, action->granularity,
1966 action->has_persistent, action->persistent,
1967 action->has_autoload, action->autoload,
1968 action->has_x_disabled, action->x_disabled,
1969 &local_err);
1970
1971 if (!local_err) {
1972 state->prepared = true;
1973 } else {
1974 error_propagate(errp, local_err);
1975 }
1976}
1977
1978static void block_dirty_bitmap_add_abort(BlkActionState *common)
1979{
1980 BlockDirtyBitmapAdd *action;
1981 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1982 common, common);
1983
1984 action = common->action->u.block_dirty_bitmap_add.data;
1985 /* Should not be able to fail: IF the bitmap was added via .prepare(),
1986 * then the node reference and bitmap name must have been valid.
1987 */
1988 if (state->prepared) {
1989 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
1990 }
1991}
1992
1993static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
1994 Error **errp)
1995{
1996 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1997 common, common);
1998 BlockDirtyBitmap *action;
1999
2000 if (action_check_completion_mode(common, errp) < 0) {
2001 return;
2002 }
2003
2004 action = common->action->u.block_dirty_bitmap_clear.data;
2005 state->bitmap = block_dirty_bitmap_lookup(action->node,
2006 action->name,
2007 &state->bs,
2008 errp);
2009 if (!state->bitmap) {
2010 return;
2011 }
2012
2013 if (bdrv_dirty_bitmap_user_locked(state->bitmap)) {
2014 error_setg(errp, "Cannot modify a bitmap in use by another operation");
2015 return;
2016 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
2017 error_setg(errp, "Cannot clear a readonly bitmap");
2018 return;
2019 }
2020
2021 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2022}
2023
2024static void block_dirty_bitmap_restore(BlkActionState *common)
2025{
2026 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2027 common, common);
2028
2029 if (state->backup) {
2030 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
2031 }
2032}
2033
2034static void block_dirty_bitmap_free_backup(BlkActionState *common)
2035{
2036 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2037 common, common);
2038
2039 hbitmap_free(state->backup);
2040}
2041
2042static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
2043 Error **errp)
2044{
2045 BlockDirtyBitmap *action;
2046 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2047 common, common);
2048
2049 if (action_check_completion_mode(common, errp) < 0) {
2050 return;
2051 }
2052
2053 action = common->action->u.x_block_dirty_bitmap_enable.data;
2054 state->bitmap = block_dirty_bitmap_lookup(action->node,
2055 action->name,
2056 NULL,
2057 errp);
2058 if (!state->bitmap) {
2059 return;
2060 }
2061
2062 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2063 bdrv_enable_dirty_bitmap(state->bitmap);
2064}
2065
2066static void block_dirty_bitmap_enable_abort(BlkActionState *common)
2067{
2068 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2069 common, common);
2070
2071 if (!state->was_enabled) {
2072 bdrv_disable_dirty_bitmap(state->bitmap);
2073 }
2074}
2075
2076static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
2077 Error **errp)
2078{
2079 BlockDirtyBitmap *action;
2080 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2081 common, common);
2082
2083 if (action_check_completion_mode(common, errp) < 0) {
2084 return;
2085 }
2086
2087 action = common->action->u.x_block_dirty_bitmap_disable.data;
2088 state->bitmap = block_dirty_bitmap_lookup(action->node,
2089 action->name,
2090 NULL,
2091 errp);
2092 if (!state->bitmap) {
2093 return;
2094 }
2095
2096 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2097 bdrv_disable_dirty_bitmap(state->bitmap);
2098}
2099
2100static void block_dirty_bitmap_disable_abort(BlkActionState *common)
2101{
2102 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2103 common, common);
2104
2105 if (state->was_enabled) {
2106 bdrv_enable_dirty_bitmap(state->bitmap);
2107 }
2108}
2109
2110static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
2111 Error **errp)
2112{
2113 BlockDirtyBitmapMerge *action;
2114 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2115 common, common);
2116 BdrvDirtyBitmap *merge_source;
2117
2118 if (action_check_completion_mode(common, errp) < 0) {
2119 return;
2120 }
2121
2122 action = common->action->u.x_block_dirty_bitmap_merge.data;
2123 state->bitmap = block_dirty_bitmap_lookup(action->node,
2124 action->dst_name,
2125 &state->bs,
2126 errp);
2127 if (!state->bitmap) {
2128 return;
2129 }
2130
2131 merge_source = bdrv_find_dirty_bitmap(state->bs, action->src_name);
2132 if (!merge_source) {
2133 return;
2134 }
2135
2136 bdrv_merge_dirty_bitmap(state->bitmap, merge_source, &state->backup, errp);
2137}
2138
2139static void abort_prepare(BlkActionState *common, Error **errp)
2140{
2141 error_setg(errp, "Transaction aborted using Abort action");
2142}
2143
2144static void abort_commit(BlkActionState *common)
2145{
2146 g_assert_not_reached(); /* this action never succeeds */
2147}
2148
2149static const BlkActionOps actions[] = {
2150 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2151 .instance_size = sizeof(ExternalSnapshotState),
2152 .prepare = external_snapshot_prepare,
2153 .commit = external_snapshot_commit,
2154 .abort = external_snapshot_abort,
2155 .clean = external_snapshot_clean,
2156 },
2157 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2158 .instance_size = sizeof(ExternalSnapshotState),
2159 .prepare = external_snapshot_prepare,
2160 .commit = external_snapshot_commit,
2161 .abort = external_snapshot_abort,
2162 .clean = external_snapshot_clean,
2163 },
2164 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2165 .instance_size = sizeof(DriveBackupState),
2166 .prepare = drive_backup_prepare,
2167 .commit = drive_backup_commit,
2168 .abort = drive_backup_abort,
2169 .clean = drive_backup_clean,
2170 },
2171 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2172 .instance_size = sizeof(BlockdevBackupState),
2173 .prepare = blockdev_backup_prepare,
2174 .commit = blockdev_backup_commit,
2175 .abort = blockdev_backup_abort,
2176 .clean = blockdev_backup_clean,
2177 },
2178 [TRANSACTION_ACTION_KIND_ABORT] = {
2179 .instance_size = sizeof(BlkActionState),
2180 .prepare = abort_prepare,
2181 .commit = abort_commit,
2182 },
2183 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2184 .instance_size = sizeof(InternalSnapshotState),
2185 .prepare = internal_snapshot_prepare,
2186 .abort = internal_snapshot_abort,
2187 .clean = internal_snapshot_clean,
2188 },
2189 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2190 .instance_size = sizeof(BlockDirtyBitmapState),
2191 .prepare = block_dirty_bitmap_add_prepare,
2192 .abort = block_dirty_bitmap_add_abort,
2193 },
2194 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2195 .instance_size = sizeof(BlockDirtyBitmapState),
2196 .prepare = block_dirty_bitmap_clear_prepare,
2197 .commit = block_dirty_bitmap_free_backup,
2198 .abort = block_dirty_bitmap_restore,
2199 },
2200 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_ENABLE] = {
2201 .instance_size = sizeof(BlockDirtyBitmapState),
2202 .prepare = block_dirty_bitmap_enable_prepare,
2203 .abort = block_dirty_bitmap_enable_abort,
2204 },
2205 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_DISABLE] = {
2206 .instance_size = sizeof(BlockDirtyBitmapState),
2207 .prepare = block_dirty_bitmap_disable_prepare,
2208 .abort = block_dirty_bitmap_disable_abort,
2209 },
2210 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_MERGE] = {
2211 .instance_size = sizeof(BlockDirtyBitmapState),
2212 .prepare = block_dirty_bitmap_merge_prepare,
2213 .commit = block_dirty_bitmap_free_backup,
2214 .abort = block_dirty_bitmap_restore,
2215 },
2216 /* Where are transactions for MIRROR, COMMIT and STREAM?
2217 * Although these blockjobs use transaction callbacks like the backup job,
2218 * these jobs do not necessarily adhere to transaction semantics.
2219 * These jobs may not fully undo all of their actions on abort, nor do they
2220 * necessarily work in transactions with more than one job in them.
2221 */
2222};
2223
2224/**
2225 * Allocate a TransactionProperties structure if necessary, and fill
2226 * that structure with desired defaults if they are unset.
2227 */
2228static TransactionProperties *get_transaction_properties(
2229 TransactionProperties *props)
2230{
2231 if (!props) {
2232 props = g_new0(TransactionProperties, 1);
2233 }
2234
2235 if (!props->has_completion_mode) {
2236 props->has_completion_mode = true;
2237 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2238 }
2239
2240 return props;
2241}
2242
2243/*
2244 * 'Atomic' group operations. The operations are performed as a set, and if
2245 * any fail then we roll back all operations in the group.
2246 */
2247void qmp_transaction(TransactionActionList *dev_list,
2248 bool has_props,
2249 struct TransactionProperties *props,
2250 Error **errp)
2251{
2252 TransactionActionList *dev_entry = dev_list;
2253 JobTxn *block_job_txn = NULL;
2254 BlkActionState *state, *next;
2255 Error *local_err = NULL;
2256
2257 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2258 QSIMPLEQ_INIT(&snap_bdrv_states);
2259
2260 /* Does this transaction get canceled as a group on failure?
2261 * If not, we don't really need to make a JobTxn.
2262 */
2263 props = get_transaction_properties(props);
2264 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2265 block_job_txn = job_txn_new();
2266 }
2267
2268 /* drain all i/o before any operations */
2269 bdrv_drain_all();
2270
2271 /* We don't do anything in this loop that commits us to the operations */
2272 while (NULL != dev_entry) {
2273 TransactionAction *dev_info = NULL;
2274 const BlkActionOps *ops;
2275
2276 dev_info = dev_entry->value;
2277 dev_entry = dev_entry->next;
2278
2279 assert(dev_info->type < ARRAY_SIZE(actions));
2280
2281 ops = &actions[dev_info->type];
2282 assert(ops->instance_size > 0);
2283
2284 state = g_malloc0(ops->instance_size);
2285 state->ops = ops;
2286 state->action = dev_info;
2287 state->block_job_txn = block_job_txn;
2288 state->txn_props = props;
2289 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2290
2291 state->ops->prepare(state, &local_err);
2292 if (local_err) {
2293 error_propagate(errp, local_err);
2294 goto delete_and_fail;
2295 }
2296 }
2297
2298 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2299 if (state->ops->commit) {
2300 state->ops->commit(state);
2301 }
2302 }
2303
2304 /* success */
2305 goto exit;
2306
2307delete_and_fail:
2308 /* failure, and it is all-or-none; roll back all operations */
2309 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2310 if (state->ops->abort) {
2311 state->ops->abort(state);
2312 }
2313 }
2314exit:
2315 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2316 if (state->ops->clean) {
2317 state->ops->clean(state);
2318 }
2319 g_free(state);
2320 }
2321 if (!has_props) {
2322 qapi_free_TransactionProperties(props);
2323 }
2324 job_txn_unref(block_job_txn);
2325}
2326
2327void qmp_eject(bool has_device, const char *device,
2328 bool has_id, const char *id,
2329 bool has_force, bool force, Error **errp)
2330{
2331 Error *local_err = NULL;
2332 int rc;
2333
2334 if (!has_force) {
2335 force = false;
2336 }
2337
2338 rc = do_open_tray(has_device ? device : NULL,
2339 has_id ? id : NULL,
2340 force, &local_err);
2341 if (rc && rc != -ENOSYS) {
2342 error_propagate(errp, local_err);
2343 return;
2344 }
2345 error_free(local_err);
2346
2347 blockdev_remove_medium(has_device, device, has_id, id, errp);
2348}
2349
2350void qmp_block_passwd(bool has_device, const char *device,
2351 bool has_node_name, const char *node_name,
2352 const char *password, Error **errp)
2353{
2354 error_setg(errp,
2355 "Setting block passwords directly is no longer supported");
2356}
2357
2358/*
2359 * Attempt to open the tray of @device.
2360 * If @force, ignore its tray lock.
2361 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2362 * On error, store an error through @errp and return -errno.
2363 * If @device does not exist, return -ENODEV.
2364 * If it has no removable media, return -ENOTSUP.
2365 * If it has no tray, return -ENOSYS.
2366 * If the guest was asked to open the tray, return -EINPROGRESS.
2367 * Else, return 0.
2368 */
2369static int do_open_tray(const char *blk_name, const char *qdev_id,
2370 bool force, Error **errp)
2371{
2372 BlockBackend *blk;
2373 const char *device = qdev_id ?: blk_name;
2374 bool locked;
2375
2376 blk = qmp_get_blk(blk_name, qdev_id, errp);
2377 if (!blk) {
2378 return -ENODEV;
2379 }
2380
2381 if (!blk_dev_has_removable_media(blk)) {
2382 error_setg(errp, "Device '%s' is not removable", device);
2383 return -ENOTSUP;
2384 }
2385
2386 if (!blk_dev_has_tray(blk)) {
2387 error_setg(errp, "Device '%s' does not have a tray", device);
2388 return -ENOSYS;
2389 }
2390
2391 if (blk_dev_is_tray_open(blk)) {
2392 return 0;
2393 }
2394
2395 locked = blk_dev_is_medium_locked(blk);
2396 if (locked) {
2397 blk_dev_eject_request(blk, force);
2398 }
2399
2400 if (!locked || force) {
2401 blk_dev_change_media_cb(blk, false, &error_abort);
2402 }
2403
2404 if (locked && !force) {
2405 error_setg(errp, "Device '%s' is locked and force was not specified, "
2406 "wait for tray to open and try again", device);
2407 return -EINPROGRESS;
2408 }
2409
2410 return 0;
2411}
2412
2413void qmp_blockdev_open_tray(bool has_device, const char *device,
2414 bool has_id, const char *id,
2415 bool has_force, bool force,
2416 Error **errp)
2417{
2418 Error *local_err = NULL;
2419 int rc;
2420
2421 if (!has_force) {
2422 force = false;
2423 }
2424 rc = do_open_tray(has_device ? device : NULL,
2425 has_id ? id : NULL,
2426 force, &local_err);
2427 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
2428 error_propagate(errp, local_err);
2429 return;
2430 }
2431 error_free(local_err);
2432}
2433
2434void qmp_blockdev_close_tray(bool has_device, const char *device,
2435 bool has_id, const char *id,
2436 Error **errp)
2437{
2438 BlockBackend *blk;
2439 Error *local_err = NULL;
2440
2441 device = has_device ? device : NULL;
2442 id = has_id ? id : NULL;
2443
2444 blk = qmp_get_blk(device, id, errp);
2445 if (!blk) {
2446 return;
2447 }
2448
2449 if (!blk_dev_has_removable_media(blk)) {
2450 error_setg(errp, "Device '%s' is not removable", device ?: id);
2451 return;
2452 }
2453
2454 if (!blk_dev_has_tray(blk)) {
2455 /* Ignore this command on tray-less devices */
2456 return;
2457 }
2458
2459 if (!blk_dev_is_tray_open(blk)) {
2460 return;
2461 }
2462
2463 blk_dev_change_media_cb(blk, true, &local_err);
2464 if (local_err) {
2465 error_propagate(errp, local_err);
2466 return;
2467 }
2468}
2469
2470static void blockdev_remove_medium(bool has_device, const char *device,
2471 bool has_id, const char *id, Error **errp)
2472{
2473 BlockBackend *blk;
2474 BlockDriverState *bs;
2475 AioContext *aio_context;
2476 bool has_attached_device;
2477
2478 device = has_device ? device : NULL;
2479 id = has_id ? id : NULL;
2480
2481 blk = qmp_get_blk(device, id, errp);
2482 if (!blk) {
2483 return;
2484 }
2485
2486 /* For BBs without a device, we can exchange the BDS tree at will */
2487 has_attached_device = blk_get_attached_dev(blk);
2488
2489 if (has_attached_device && !blk_dev_has_removable_media(blk)) {
2490 error_setg(errp, "Device '%s' is not removable", device ?: id);
2491 return;
2492 }
2493
2494 if (has_attached_device && blk_dev_has_tray(blk) &&
2495 !blk_dev_is_tray_open(blk))
2496 {
2497 error_setg(errp, "Tray of device '%s' is not open", device ?: id);
2498 return;
2499 }
2500
2501 bs = blk_bs(blk);
2502 if (!bs) {
2503 return;
2504 }
2505
2506 aio_context = bdrv_get_aio_context(bs);
2507 aio_context_acquire(aio_context);
2508
2509 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2510 goto out;
2511 }
2512
2513 blk_remove_bs(blk);
2514
2515 if (!blk_dev_has_tray(blk)) {
2516 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2517 * called at all); therefore, the medium needs to be ejected here.
2518 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2519 * value passed here (i.e. false). */
2520 blk_dev_change_media_cb(blk, false, &error_abort);
2521 }
2522
2523out:
2524 aio_context_release(aio_context);
2525}
2526
2527void qmp_blockdev_remove_medium(const char *id, Error **errp)
2528{
2529 blockdev_remove_medium(false, NULL, true, id, errp);
2530}
2531
2532static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2533 BlockDriverState *bs, Error **errp)
2534{
2535 Error *local_err = NULL;
2536 bool has_device;
2537 int ret;
2538
2539 /* For BBs without a device, we can exchange the BDS tree at will */
2540 has_device = blk_get_attached_dev(blk);
2541
2542 if (has_device && !blk_dev_has_removable_media(blk)) {
2543 error_setg(errp, "Device is not removable");
2544 return;
2545 }
2546
2547 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2548 error_setg(errp, "Tray of the device is not open");
2549 return;
2550 }
2551
2552 if (blk_bs(blk)) {
2553 error_setg(errp, "There already is a medium in the device");
2554 return;
2555 }
2556
2557 ret = blk_insert_bs(blk, bs, errp);
2558 if (ret < 0) {
2559 return;
2560 }
2561
2562 if (!blk_dev_has_tray(blk)) {
2563 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2564 * called at all); therefore, the medium needs to be pushed into the
2565 * slot here.
2566 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2567 * value passed here (i.e. true). */
2568 blk_dev_change_media_cb(blk, true, &local_err);
2569 if (local_err) {
2570 error_propagate(errp, local_err);
2571 blk_remove_bs(blk);
2572 return;
2573 }
2574 }
2575}
2576
2577static void blockdev_insert_medium(bool has_device, const char *device,
2578 bool has_id, const char *id,
2579 const char *node_name, Error **errp)
2580{
2581 BlockBackend *blk;
2582 BlockDriverState *bs;
2583
2584 blk = qmp_get_blk(has_device ? device : NULL,
2585 has_id ? id : NULL,
2586 errp);
2587 if (!blk) {
2588 return;
2589 }
2590
2591 bs = bdrv_find_node(node_name);
2592 if (!bs) {
2593 error_setg(errp, "Node '%s' not found", node_name);
2594 return;
2595 }
2596
2597 if (bdrv_has_blk(bs)) {
2598 error_setg(errp, "Node '%s' is already in use", node_name);
2599 return;
2600 }
2601
2602 qmp_blockdev_insert_anon_medium(blk, bs, errp);
2603}
2604
2605void qmp_blockdev_insert_medium(const char *id, const char *node_name,
2606 Error **errp)
2607{
2608 blockdev_insert_medium(false, NULL, true, id, node_name, errp);
2609}
2610
2611void qmp_blockdev_change_medium(bool has_device, const char *device,
2612 bool has_id, const char *id,
2613 const char *filename,
2614 bool has_format, const char *format,
2615 bool has_read_only,
2616 BlockdevChangeReadOnlyMode read_only,
2617 Error **errp)
2618{
2619 BlockBackend *blk;
2620 BlockDriverState *medium_bs = NULL;
2621 int bdrv_flags;
2622 bool detect_zeroes;
2623 int rc;
2624 QDict *options = NULL;
2625 Error *err = NULL;
2626
2627 blk = qmp_get_blk(has_device ? device : NULL,
2628 has_id ? id : NULL,
2629 errp);
2630 if (!blk) {
2631 goto fail;
2632 }
2633
2634 if (blk_bs(blk)) {
2635 blk_update_root_state(blk);
2636 }
2637
2638 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2639 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2640 BDRV_O_PROTOCOL);
2641
2642 if (!has_read_only) {
2643 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2644 }
2645
2646 switch (read_only) {
2647 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2648 break;
2649
2650 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2651 bdrv_flags &= ~BDRV_O_RDWR;
2652 break;
2653
2654 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2655 bdrv_flags |= BDRV_O_RDWR;
2656 break;
2657
2658 default:
2659 abort();
2660 }
2661
2662 options = qdict_new();
2663 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2664 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
2665
2666 if (has_format) {
2667 qdict_put_str(options, "driver", format);
2668 }
2669
2670 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
2671 if (!medium_bs) {
2672 goto fail;
2673 }
2674
2675 rc = do_open_tray(has_device ? device : NULL,
2676 has_id ? id : NULL,
2677 false, &err);
2678 if (rc && rc != -ENOSYS) {
2679 error_propagate(errp, err);
2680 goto fail;
2681 }
2682 error_free(err);
2683 err = NULL;
2684
2685 blockdev_remove_medium(has_device, device, has_id, id, &err);
2686 if (err) {
2687 error_propagate(errp, err);
2688 goto fail;
2689 }
2690
2691 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2692 if (err) {
2693 error_propagate(errp, err);
2694 goto fail;
2695 }
2696
2697 qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2698
2699fail:
2700 /* If the medium has been inserted, the device has its own reference, so
2701 * ours must be relinquished; and if it has not been inserted successfully,
2702 * the reference must be relinquished anyway */
2703 bdrv_unref(medium_bs);
2704}
2705
2706/* throttling disk I/O limits */
2707void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2708{
2709 ThrottleConfig cfg;
2710 BlockDriverState *bs;
2711 BlockBackend *blk;
2712 AioContext *aio_context;
2713
2714 blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
2715 arg->has_id ? arg->id : NULL,
2716 errp);
2717 if (!blk) {
2718 return;
2719 }
2720
2721 aio_context = blk_get_aio_context(blk);
2722 aio_context_acquire(aio_context);
2723
2724 bs = blk_bs(blk);
2725 if (!bs) {
2726 error_setg(errp, "Device has no medium");
2727 goto out;
2728 }
2729
2730 throttle_config_init(&cfg);
2731 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
2732 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd;
2733 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
2734
2735 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
2736 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd;
2737 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
2738
2739 if (arg->has_bps_max) {
2740 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2741 }
2742 if (arg->has_bps_rd_max) {
2743 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2744 }
2745 if (arg->has_bps_wr_max) {
2746 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2747 }
2748 if (arg->has_iops_max) {
2749 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2750 }
2751 if (arg->has_iops_rd_max) {
2752 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2753 }
2754 if (arg->has_iops_wr_max) {
2755 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2756 }
2757
2758 if (arg->has_bps_max_length) {
2759 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2760 }
2761 if (arg->has_bps_rd_max_length) {
2762 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2763 }
2764 if (arg->has_bps_wr_max_length) {
2765 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2766 }
2767 if (arg->has_iops_max_length) {
2768 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2769 }
2770 if (arg->has_iops_rd_max_length) {
2771 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2772 }
2773 if (arg->has_iops_wr_max_length) {
2774 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2775 }
2776
2777 if (arg->has_iops_size) {
2778 cfg.op_size = arg->iops_size;
2779 }
2780
2781 if (!throttle_is_valid(&cfg, errp)) {
2782 goto out;
2783 }
2784
2785 if (throttle_enabled(&cfg)) {
2786 /* Enable I/O limits if they're not enabled yet, otherwise
2787 * just update the throttling group. */
2788 if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
2789 blk_io_limits_enable(blk,
2790 arg->has_group ? arg->group :
2791 arg->has_device ? arg->device :
2792 arg->id);
2793 } else if (arg->has_group) {
2794 blk_io_limits_update_group(blk, arg->group);
2795 }
2796 /* Set the new throttling configuration */
2797 blk_set_io_limits(blk, &cfg);
2798 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
2799 /* If all throttling settings are set to 0, disable I/O limits */
2800 blk_io_limits_disable(blk);
2801 }
2802
2803out:
2804 aio_context_release(aio_context);
2805}
2806
2807void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2808 bool has_granularity, uint32_t granularity,
2809 bool has_persistent, bool persistent,
2810 bool has_autoload, bool autoload,
2811 bool has_disabled, bool disabled,
2812 Error **errp)
2813{
2814 BlockDriverState *bs;
2815 BdrvDirtyBitmap *bitmap;
2816
2817 if (!name || name[0] == '\0') {
2818 error_setg(errp, "Bitmap name cannot be empty");
2819 return;
2820 }
2821
2822 bs = bdrv_lookup_bs(node, node, errp);
2823 if (!bs) {
2824 return;
2825 }
2826
2827 if (has_granularity) {
2828 if (granularity < 512 || !is_power_of_2(granularity)) {
2829 error_setg(errp, "Granularity must be power of 2 "
2830 "and at least 512");
2831 return;
2832 }
2833 } else {
2834 /* Default to cluster size, if available: */
2835 granularity = bdrv_get_default_bitmap_granularity(bs);
2836 }
2837
2838 if (!has_persistent) {
2839 persistent = false;
2840 }
2841
2842 if (has_autoload) {
2843 warn_report("Autoload option is deprecated and its value is ignored");
2844 }
2845
2846 if (!has_disabled) {
2847 disabled = false;
2848 }
2849
2850 if (persistent &&
2851 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
2852 {
2853 return;
2854 }
2855
2856 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2857 if (bitmap == NULL) {
2858 return;
2859 }
2860
2861 if (disabled) {
2862 bdrv_disable_dirty_bitmap(bitmap);
2863 }
2864
2865 bdrv_dirty_bitmap_set_persistance(bitmap, persistent);
2866}
2867
2868void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2869 Error **errp)
2870{
2871 BlockDriverState *bs;
2872 BdrvDirtyBitmap *bitmap;
2873 Error *local_err = NULL;
2874
2875 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2876 if (!bitmap || !bs) {
2877 return;
2878 }
2879
2880 if (bdrv_dirty_bitmap_user_locked(bitmap)) {
2881 error_setg(errp,
2882 "Bitmap '%s' is currently in use by another operation and"
2883 " cannot be removed", name);
2884 return;
2885 }
2886
2887 if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
2888 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
2889 if (local_err != NULL) {
2890 error_propagate(errp, local_err);
2891 return;
2892 }
2893 }
2894
2895 bdrv_release_dirty_bitmap(bs, bitmap);
2896}
2897
2898/**
2899 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2900 * immediately after a full backup operation.
2901 */
2902void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2903 Error **errp)
2904{
2905 BdrvDirtyBitmap *bitmap;
2906 BlockDriverState *bs;
2907
2908 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2909 if (!bitmap || !bs) {
2910 return;
2911 }
2912
2913 if (bdrv_dirty_bitmap_user_locked(bitmap)) {
2914 error_setg(errp,
2915 "Bitmap '%s' is currently in use by another operation"
2916 " and cannot be cleared", 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
2926void qmp_x_block_dirty_bitmap_enable(const char *node, const char *name,
2927 Error **errp)
2928{
2929 BlockDriverState *bs;
2930 BdrvDirtyBitmap *bitmap;
2931
2932 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2933 if (!bitmap) {
2934 return;
2935 }
2936
2937 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2938 error_setg(errp,
2939 "Bitmap '%s' is currently frozen and cannot be enabled",
2940 name);
2941 return;
2942 }
2943
2944 bdrv_enable_dirty_bitmap(bitmap);
2945}
2946
2947void qmp_x_block_dirty_bitmap_disable(const char *node, const char *name,
2948 Error **errp)
2949{
2950 BlockDriverState *bs;
2951 BdrvDirtyBitmap *bitmap;
2952
2953 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2954 if (!bitmap) {
2955 return;
2956 }
2957
2958 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2959 error_setg(errp,
2960 "Bitmap '%s' is currently frozen and cannot be disabled",
2961 name);
2962 return;
2963 }
2964
2965 bdrv_disable_dirty_bitmap(bitmap);
2966}
2967
2968void qmp_x_block_dirty_bitmap_merge(const char *node, const char *dst_name,
2969 const char *src_name, Error **errp)
2970{
2971 BlockDriverState *bs;
2972 BdrvDirtyBitmap *dst, *src;
2973
2974 dst = block_dirty_bitmap_lookup(node, dst_name, &bs, errp);
2975 if (!dst) {
2976 return;
2977 }
2978
2979 src = bdrv_find_dirty_bitmap(bs, src_name);
2980 if (!src) {
2981 error_setg(errp, "Dirty bitmap '%s' not found", src_name);
2982 return;
2983 }
2984
2985 bdrv_merge_dirty_bitmap(dst, src, NULL, errp);
2986}
2987
2988BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2989 const char *name,
2990 Error **errp)
2991{
2992 BdrvDirtyBitmap *bitmap;
2993 BlockDriverState *bs;
2994 BlockDirtyBitmapSha256 *ret = NULL;
2995 char *sha256;
2996
2997 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2998 if (!bitmap || !bs) {
2999 return NULL;
3000 }
3001
3002 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
3003 if (sha256 == NULL) {
3004 return NULL;
3005 }
3006
3007 ret = g_new(BlockDirtyBitmapSha256, 1);
3008 ret->sha256 = sha256;
3009
3010 return ret;
3011}
3012
3013void hmp_drive_del(Monitor *mon, const QDict *qdict)
3014{
3015 const char *id = qdict_get_str(qdict, "id");
3016 BlockBackend *blk;
3017 BlockDriverState *bs;
3018 AioContext *aio_context;
3019 Error *local_err = NULL;
3020
3021 bs = bdrv_find_node(id);
3022 if (bs) {
3023 qmp_blockdev_del(id, &local_err);
3024 if (local_err) {
3025 error_report_err(local_err);
3026 }
3027 return;
3028 }
3029
3030 blk = blk_by_name(id);
3031 if (!blk) {
3032 error_report("Device '%s' not found", id);
3033 return;
3034 }
3035
3036 if (!blk_legacy_dinfo(blk)) {
3037 error_report("Deleting device added with blockdev-add"
3038 " is not supported");
3039 return;
3040 }
3041
3042 aio_context = blk_get_aio_context(blk);
3043 aio_context_acquire(aio_context);
3044
3045 bs = blk_bs(blk);
3046 if (bs) {
3047 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
3048 error_report_err(local_err);
3049 aio_context_release(aio_context);
3050 return;
3051 }
3052
3053 blk_remove_bs(blk);
3054 }
3055
3056 /* Make the BlockBackend and the attached BlockDriverState anonymous */
3057 monitor_remove_blk(blk);
3058
3059 /* If this BlockBackend has a device attached to it, its refcount will be
3060 * decremented when the device is removed; otherwise we have to do so here.
3061 */
3062 if (blk_get_attached_dev(blk)) {
3063 /* Further I/O must not pause the guest */
3064 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
3065 BLOCKDEV_ON_ERROR_REPORT);
3066 } else {
3067 blk_unref(blk);
3068 }
3069
3070 aio_context_release(aio_context);
3071}
3072
3073void qmp_block_resize(bool has_device, const char *device,
3074 bool has_node_name, const char *node_name,
3075 int64_t size, Error **errp)
3076{
3077 Error *local_err = NULL;
3078 BlockBackend *blk = NULL;
3079 BlockDriverState *bs;
3080 AioContext *aio_context;
3081 int ret;
3082
3083 bs = bdrv_lookup_bs(has_device ? device : NULL,
3084 has_node_name ? node_name : NULL,
3085 &local_err);
3086 if (local_err) {
3087 error_propagate(errp, local_err);
3088 return;
3089 }
3090
3091 aio_context = bdrv_get_aio_context(bs);
3092 aio_context_acquire(aio_context);
3093
3094 if (!bdrv_is_first_non_filter(bs)) {
3095 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
3096 goto out;
3097 }
3098
3099 if (size < 0) {
3100 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
3101 goto out;
3102 }
3103
3104 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
3105 error_setg(errp, QERR_DEVICE_IN_USE, device);
3106 goto out;
3107 }
3108
3109 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
3110 ret = blk_insert_bs(blk, bs, errp);
3111 if (ret < 0) {
3112 goto out;
3113 }
3114
3115 bdrv_drained_begin(bs);
3116 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
3117 bdrv_drained_end(bs);
3118
3119out:
3120 blk_unref(blk);
3121 aio_context_release(aio_context);
3122}
3123
3124void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
3125 bool has_base, const char *base,
3126 bool has_base_node, const char *base_node,
3127 bool has_backing_file, const char *backing_file,
3128 bool has_speed, int64_t speed,
3129 bool has_on_error, BlockdevOnError on_error,
3130 bool has_auto_finalize, bool auto_finalize,
3131 bool has_auto_dismiss, bool auto_dismiss,
3132 Error **errp)
3133{
3134 BlockDriverState *bs, *iter;
3135 BlockDriverState *base_bs = NULL;
3136 AioContext *aio_context;
3137 Error *local_err = NULL;
3138 const char *base_name = NULL;
3139 int job_flags = JOB_DEFAULT;
3140
3141 if (!has_on_error) {
3142 on_error = BLOCKDEV_ON_ERROR_REPORT;
3143 }
3144
3145 bs = bdrv_lookup_bs(device, device, errp);
3146 if (!bs) {
3147 return;
3148 }
3149
3150 aio_context = bdrv_get_aio_context(bs);
3151 aio_context_acquire(aio_context);
3152
3153 if (has_base && has_base_node) {
3154 error_setg(errp, "'base' and 'base-node' cannot be specified "
3155 "at the same time");
3156 goto out;
3157 }
3158
3159 if (has_base) {
3160 base_bs = bdrv_find_backing_image(bs, base);
3161 if (base_bs == NULL) {
3162 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3163 goto out;
3164 }
3165 assert(bdrv_get_aio_context(base_bs) == aio_context);
3166 base_name = base;
3167 }
3168
3169 if (has_base_node) {
3170 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3171 if (!base_bs) {
3172 goto out;
3173 }
3174 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
3175 error_setg(errp, "Node '%s' is not a backing image of '%s'",
3176 base_node, device);
3177 goto out;
3178 }
3179 assert(bdrv_get_aio_context(base_bs) == aio_context);
3180 base_name = base_bs->filename;
3181 }
3182
3183 /* Check for op blockers in the whole chain between bs and base */
3184 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
3185 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
3186 goto out;
3187 }
3188 }
3189
3190 /* if we are streaming the entire chain, the result will have no backing
3191 * file, and specifying one is therefore an error */
3192 if (base_bs == NULL && has_backing_file) {
3193 error_setg(errp, "backing file specified, but streaming the "
3194 "entire chain");
3195 goto out;
3196 }
3197
3198 /* backing_file string overrides base bs filename */
3199 base_name = has_backing_file ? backing_file : base_name;
3200
3201 if (has_auto_finalize && !auto_finalize) {
3202 job_flags |= JOB_MANUAL_FINALIZE;
3203 }
3204 if (has_auto_dismiss && !auto_dismiss) {
3205 job_flags |= JOB_MANUAL_DISMISS;
3206 }
3207
3208 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
3209 job_flags, has_speed ? speed : 0, on_error, &local_err);
3210 if (local_err) {
3211 error_propagate(errp, local_err);
3212 goto out;
3213 }
3214
3215 trace_qmp_block_stream(bs, bs->job);
3216
3217out:
3218 aio_context_release(aio_context);
3219}
3220
3221void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3222 bool has_base_node, const char *base_node,
3223 bool has_base, const char *base,
3224 bool has_top_node, const char *top_node,
3225 bool has_top, const char *top,
3226 bool has_backing_file, const char *backing_file,
3227 bool has_speed, int64_t speed,
3228 bool has_filter_node_name, const char *filter_node_name,
3229 bool has_auto_finalize, bool auto_finalize,
3230 bool has_auto_dismiss, bool auto_dismiss,
3231 Error **errp)
3232{
3233 BlockDriverState *bs;
3234 BlockDriverState *iter;
3235 BlockDriverState *base_bs, *top_bs;
3236 AioContext *aio_context;
3237 Error *local_err = NULL;
3238 /* This will be part of the QMP command, if/when the
3239 * BlockdevOnError change for blkmirror makes it in
3240 */
3241 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3242 int job_flags = JOB_DEFAULT;
3243
3244 if (!has_speed) {
3245 speed = 0;
3246 }
3247 if (!has_filter_node_name) {
3248 filter_node_name = NULL;
3249 }
3250 if (has_auto_finalize && !auto_finalize) {
3251 job_flags |= JOB_MANUAL_FINALIZE;
3252 }
3253 if (has_auto_dismiss && !auto_dismiss) {
3254 job_flags |= JOB_MANUAL_DISMISS;
3255 }
3256
3257 /* Important Note:
3258 * libvirt relies on the DeviceNotFound error class in order to probe for
3259 * live commit feature versions; for this to work, we must make sure to
3260 * perform the device lookup before any generic errors that may occur in a
3261 * scenario in which all optional arguments are omitted. */
3262 bs = qmp_get_root_bs(device, &local_err);
3263 if (!bs) {
3264 bs = bdrv_lookup_bs(device, device, NULL);
3265 if (!bs) {
3266 error_free(local_err);
3267 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3268 "Device '%s' not found", device);
3269 } else {
3270 error_propagate(errp, local_err);
3271 }
3272 return;
3273 }
3274
3275 aio_context = bdrv_get_aio_context(bs);
3276 aio_context_acquire(aio_context);
3277
3278 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3279 goto out;
3280 }
3281
3282 /* default top_bs is the active layer */
3283 top_bs = bs;
3284
3285 if (has_top_node && has_top) {
3286 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
3287 goto out;
3288 } else if (has_top_node) {
3289 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
3290 if (top_bs == NULL) {
3291 goto out;
3292 }
3293 if (!bdrv_chain_contains(bs, top_bs)) {
3294 error_setg(errp, "'%s' is not in this backing file chain",
3295 top_node);
3296 goto out;
3297 }
3298 } else if (has_top && top) {
3299 if (strcmp(bs->filename, top) != 0) {
3300 top_bs = bdrv_find_backing_image(bs, top);
3301 }
3302 }
3303
3304 if (top_bs == NULL) {
3305 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3306 goto out;
3307 }
3308
3309 assert(bdrv_get_aio_context(top_bs) == aio_context);
3310
3311 if (has_base_node && has_base) {
3312 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
3313 goto out;
3314 } else if (has_base_node) {
3315 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3316 if (base_bs == NULL) {
3317 goto out;
3318 }
3319 if (!bdrv_chain_contains(top_bs, base_bs)) {
3320 error_setg(errp, "'%s' is not in this backing file chain",
3321 base_node);
3322 goto out;
3323 }
3324 } else if (has_base && base) {
3325 base_bs = bdrv_find_backing_image(top_bs, base);
3326 } else {
3327 base_bs = bdrv_find_base(top_bs);
3328 }
3329
3330 if (base_bs == NULL) {
3331 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3332 goto out;
3333 }
3334
3335 assert(bdrv_get_aio_context(base_bs) == aio_context);
3336
3337 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
3338 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3339 goto out;
3340 }
3341 }
3342
3343 /* Do not allow attempts to commit an image into itself */
3344 if (top_bs == base_bs) {
3345 error_setg(errp, "cannot commit an image into itself");
3346 goto out;
3347 }
3348
3349 if (top_bs == bs) {
3350 if (has_backing_file) {
3351 error_setg(errp, "'backing-file' specified,"
3352 " but 'top' is the active layer");
3353 goto out;
3354 }
3355 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3356 job_flags, speed, on_error,
3357 filter_node_name, NULL, NULL, false, &local_err);
3358 } else {
3359 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
3360 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3361 goto out;
3362 }
3363 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags,
3364 speed, on_error, has_backing_file ? backing_file : NULL,
3365 filter_node_name, &local_err);
3366 }
3367 if (local_err != NULL) {
3368 error_propagate(errp, local_err);
3369 goto out;
3370 }
3371
3372out:
3373 aio_context_release(aio_context);
3374}
3375
3376static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
3377 Error **errp)
3378{
3379 BlockDriverState *bs;
3380 BlockDriverState *target_bs;
3381 BlockDriverState *source = NULL;
3382 BlockJob *job = NULL;
3383 BdrvDirtyBitmap *bmap = NULL;
3384 AioContext *aio_context;
3385 QDict *options = NULL;
3386 Error *local_err = NULL;
3387 int flags, job_flags = JOB_DEFAULT;
3388 int64_t size;
3389 bool set_backing_hd = false;
3390
3391 if (!backup->has_speed) {
3392 backup->speed = 0;
3393 }
3394 if (!backup->has_on_source_error) {
3395 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3396 }
3397 if (!backup->has_on_target_error) {
3398 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3399 }
3400 if (!backup->has_mode) {
3401 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3402 }
3403 if (!backup->has_job_id) {
3404 backup->job_id = NULL;
3405 }
3406 if (!backup->has_auto_finalize) {
3407 backup->auto_finalize = true;
3408 }
3409 if (!backup->has_auto_dismiss) {
3410 backup->auto_dismiss = true;
3411 }
3412 if (!backup->has_compress) {
3413 backup->compress = false;
3414 }
3415
3416 bs = qmp_get_root_bs(backup->device, errp);
3417 if (!bs) {
3418 return NULL;
3419 }
3420
3421 aio_context = bdrv_get_aio_context(bs);
3422 aio_context_acquire(aio_context);
3423
3424 if (!backup->has_format) {
3425 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
3426 NULL : (char*) bs->drv->format_name;
3427 }
3428
3429 /* Early check to avoid creating target */
3430 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3431 goto out;
3432 }
3433
3434 flags = bs->open_flags | BDRV_O_RDWR;
3435
3436 /* See if we have a backing HD we can use to create our new image
3437 * on top of. */
3438 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3439 source = backing_bs(bs);
3440 if (!source) {
3441 backup->sync = MIRROR_SYNC_MODE_FULL;
3442 }
3443 }
3444 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3445 source = bs;
3446 flags |= BDRV_O_NO_BACKING;
3447 set_backing_hd = true;
3448 }
3449
3450 size = bdrv_getlength(bs);
3451 if (size < 0) {
3452 error_setg_errno(errp, -size, "bdrv_getlength failed");
3453 goto out;
3454 }
3455
3456 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
3457 assert(backup->format);
3458 if (source) {
3459 bdrv_img_create(backup->target, backup->format, source->filename,
3460 source->drv->format_name, NULL,
3461 size, flags, false, &local_err);
3462 } else {
3463 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
3464 size, flags, false, &local_err);
3465 }
3466 }
3467
3468 if (local_err) {
3469 error_propagate(errp, local_err);
3470 goto out;
3471 }
3472
3473 if (backup->format) {
3474 if (!options) {
3475 options = qdict_new();
3476 }
3477 qdict_put_str(options, "driver", backup->format);
3478 }
3479
3480 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
3481 if (!target_bs) {
3482 goto out;
3483 }
3484
3485 bdrv_set_aio_context(target_bs, aio_context);
3486
3487 if (set_backing_hd) {
3488 bdrv_set_backing_hd(target_bs, source, &local_err);
3489 if (local_err) {
3490 bdrv_unref(target_bs);
3491 goto out;
3492 }
3493 }
3494
3495 if (backup->has_bitmap) {
3496 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3497 if (!bmap) {
3498 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3499 bdrv_unref(target_bs);
3500 goto out;
3501 }
3502 if (bdrv_dirty_bitmap_qmp_locked(bmap)) {
3503 error_setg(errp,
3504 "Bitmap '%s' is currently locked and cannot be used for "
3505 "backup", backup->bitmap);
3506 goto out;
3507 }
3508 }
3509 if (!backup->auto_finalize) {
3510 job_flags |= JOB_MANUAL_FINALIZE;
3511 }
3512 if (!backup->auto_dismiss) {
3513 job_flags |= JOB_MANUAL_DISMISS;
3514 }
3515
3516 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3517 backup->sync, bmap, backup->compress,
3518 backup->on_source_error, backup->on_target_error,
3519 job_flags, NULL, NULL, txn, &local_err);
3520 bdrv_unref(target_bs);
3521 if (local_err != NULL) {
3522 error_propagate(errp, local_err);
3523 goto out;
3524 }
3525
3526out:
3527 aio_context_release(aio_context);
3528 return job;
3529}
3530
3531void qmp_drive_backup(DriveBackup *arg, Error **errp)
3532{
3533
3534 BlockJob *job;
3535 job = do_drive_backup(arg, NULL, errp);
3536 if (job) {
3537 job_start(&job->job);
3538 }
3539}
3540
3541BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3542{
3543 return bdrv_named_nodes_list(errp);
3544}
3545
3546BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
3547 Error **errp)
3548{
3549 BlockDriverState *bs;
3550 BlockDriverState *target_bs;
3551 Error *local_err = NULL;
3552 BdrvDirtyBitmap *bmap = NULL;
3553 AioContext *aio_context;
3554 BlockJob *job = NULL;
3555 int job_flags = JOB_DEFAULT;
3556
3557 if (!backup->has_speed) {
3558 backup->speed = 0;
3559 }
3560 if (!backup->has_on_source_error) {
3561 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3562 }
3563 if (!backup->has_on_target_error) {
3564 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3565 }
3566 if (!backup->has_job_id) {
3567 backup->job_id = NULL;
3568 }
3569 if (!backup->has_auto_finalize) {
3570 backup->auto_finalize = true;
3571 }
3572 if (!backup->has_auto_dismiss) {
3573 backup->auto_dismiss = true;
3574 }
3575 if (!backup->has_compress) {
3576 backup->compress = false;
3577 }
3578
3579 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
3580 if (!bs) {
3581 return NULL;
3582 }
3583
3584 aio_context = bdrv_get_aio_context(bs);
3585 aio_context_acquire(aio_context);
3586
3587 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
3588 if (!target_bs) {
3589 goto out;
3590 }
3591
3592 if (bdrv_get_aio_context(target_bs) != aio_context) {
3593 if (!bdrv_has_blk(target_bs)) {
3594 /* The target BDS is not attached, we can safely move it to another
3595 * AioContext. */
3596 bdrv_set_aio_context(target_bs, aio_context);
3597 } else {
3598 error_setg(errp, "Target is attached to a different thread from "
3599 "source.");
3600 goto out;
3601 }
3602 }
3603
3604 if (backup->has_bitmap) {
3605 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3606 if (!bmap) {
3607 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3608 goto out;
3609 }
3610 if (bdrv_dirty_bitmap_qmp_locked(bmap)) {
3611 error_setg(errp,
3612 "Bitmap '%s' is currently locked and cannot be used for "
3613 "backup", backup->bitmap);
3614 goto out;
3615 }
3616 }
3617
3618 if (!backup->auto_finalize) {
3619 job_flags |= JOB_MANUAL_FINALIZE;
3620 }
3621 if (!backup->auto_dismiss) {
3622 job_flags |= JOB_MANUAL_DISMISS;
3623 }
3624 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3625 backup->sync, bmap, backup->compress,
3626 backup->on_source_error, backup->on_target_error,
3627 job_flags, NULL, NULL, txn, &local_err);
3628 if (local_err != NULL) {
3629 error_propagate(errp, local_err);
3630 }
3631out:
3632 aio_context_release(aio_context);
3633 return job;
3634}
3635
3636void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
3637{
3638 BlockJob *job;
3639 job = do_blockdev_backup(arg, NULL, errp);
3640 if (job) {
3641 job_start(&job->job);
3642 }
3643}
3644
3645/* Parameter check and block job starting for drive mirroring.
3646 * Caller should hold @device and @target's aio context (must be the same).
3647 **/
3648static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3649 BlockDriverState *target,
3650 bool has_replaces, const char *replaces,
3651 enum MirrorSyncMode sync,
3652 BlockMirrorBackingMode backing_mode,
3653 bool has_speed, int64_t speed,
3654 bool has_granularity, uint32_t granularity,
3655 bool has_buf_size, int64_t buf_size,
3656 bool has_on_source_error,
3657 BlockdevOnError on_source_error,
3658 bool has_on_target_error,
3659 BlockdevOnError on_target_error,
3660 bool has_unmap, bool unmap,
3661 bool has_filter_node_name,
3662 const char *filter_node_name,
3663 bool has_copy_mode, MirrorCopyMode copy_mode,
3664 bool has_auto_finalize, bool auto_finalize,
3665 bool has_auto_dismiss, bool auto_dismiss,
3666 Error **errp)
3667{
3668 int job_flags = JOB_DEFAULT;
3669
3670 if (!has_speed) {
3671 speed = 0;
3672 }
3673 if (!has_on_source_error) {
3674 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3675 }
3676 if (!has_on_target_error) {
3677 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3678 }
3679 if (!has_granularity) {
3680 granularity = 0;
3681 }
3682 if (!has_buf_size) {
3683 buf_size = 0;
3684 }
3685 if (!has_unmap) {
3686 unmap = true;
3687 }
3688 if (!has_filter_node_name) {
3689 filter_node_name = NULL;
3690 }
3691 if (!has_copy_mode) {
3692 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
3693 }
3694 if (has_auto_finalize && !auto_finalize) {
3695 job_flags |= JOB_MANUAL_FINALIZE;
3696 }
3697 if (has_auto_dismiss && !auto_dismiss) {
3698 job_flags |= JOB_MANUAL_DISMISS;
3699 }
3700
3701 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3702 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3703 "a value in range [512B, 64MB]");
3704 return;
3705 }
3706 if (granularity & (granularity - 1)) {
3707 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3708 "power of 2");
3709 return;
3710 }
3711
3712 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3713 return;
3714 }
3715 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3716 return;
3717 }
3718
3719 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3720 sync = MIRROR_SYNC_MODE_FULL;
3721 }
3722
3723 /* pass the node name to replace to mirror start since it's loose coupling
3724 * and will allow to check whether the node still exist at mirror completion
3725 */
3726 mirror_start(job_id, bs, target,
3727 has_replaces ? replaces : NULL, job_flags,
3728 speed, granularity, buf_size, sync, backing_mode,
3729 on_source_error, on_target_error, unmap, filter_node_name,
3730 copy_mode, errp);
3731}
3732
3733void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3734{
3735 BlockDriverState *bs;
3736 BlockDriverState *source, *target_bs;
3737 AioContext *aio_context;
3738 BlockMirrorBackingMode backing_mode;
3739 Error *local_err = NULL;
3740 QDict *options = NULL;
3741 int flags;
3742 int64_t size;
3743 const char *format = arg->format;
3744
3745 bs = qmp_get_root_bs(arg->device, errp);
3746 if (!bs) {
3747 return;
3748 }
3749
3750 /* Early check to avoid creating target */
3751 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3752 return;
3753 }
3754
3755 aio_context = bdrv_get_aio_context(bs);
3756 aio_context_acquire(aio_context);
3757
3758 if (!arg->has_mode) {
3759 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3760 }
3761
3762 if (!arg->has_format) {
3763 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3764 ? NULL : bs->drv->format_name);
3765 }
3766
3767 flags = bs->open_flags | BDRV_O_RDWR;
3768 source = backing_bs(bs);
3769 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
3770 arg->sync = MIRROR_SYNC_MODE_FULL;
3771 }
3772 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3773 source = bs;
3774 }
3775
3776 size = bdrv_getlength(bs);
3777 if (size < 0) {
3778 error_setg_errno(errp, -size, "bdrv_getlength failed");
3779 goto out;
3780 }
3781
3782 if (arg->has_replaces) {
3783 BlockDriverState *to_replace_bs;
3784 AioContext *replace_aio_context;
3785 int64_t replace_size;
3786
3787 if (!arg->has_node_name) {
3788 error_setg(errp, "a node-name must be provided when replacing a"
3789 " named node of the graph");
3790 goto out;
3791 }
3792
3793 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
3794
3795 if (!to_replace_bs) {
3796 error_propagate(errp, local_err);
3797 goto out;
3798 }
3799
3800 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3801 aio_context_acquire(replace_aio_context);
3802 replace_size = bdrv_getlength(to_replace_bs);
3803 aio_context_release(replace_aio_context);
3804
3805 if (size != replace_size) {
3806 error_setg(errp, "cannot replace image with a mirror image of "
3807 "different size");
3808 goto out;
3809 }
3810 }
3811
3812 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3813 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3814 } else {
3815 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3816 }
3817
3818 /* Don't open backing image in create() */
3819 flags |= BDRV_O_NO_BACKING;
3820
3821 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
3822 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3823 {
3824 /* create new image w/o backing file */
3825 assert(format);
3826 bdrv_img_create(arg->target, format,
3827 NULL, NULL, NULL, size, flags, false, &local_err);
3828 } else {
3829 switch (arg->mode) {
3830 case NEW_IMAGE_MODE_EXISTING:
3831 break;
3832 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3833 /* create new image with backing file */
3834 bdrv_img_create(arg->target, format,
3835 source->filename,
3836 source->drv->format_name,
3837 NULL, size, flags, false, &local_err);
3838 break;
3839 default:
3840 abort();
3841 }
3842 }
3843
3844 if (local_err) {
3845 error_propagate(errp, local_err);
3846 goto out;
3847 }
3848
3849 options = qdict_new();
3850 if (arg->has_node_name) {
3851 qdict_put_str(options, "node-name", arg->node_name);
3852 }
3853 if (format) {
3854 qdict_put_str(options, "driver", format);
3855 }
3856
3857 /* Mirroring takes care of copy-on-write using the source's backing
3858 * file.
3859 */
3860 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3861 if (!target_bs) {
3862 goto out;
3863 }
3864
3865 bdrv_set_aio_context(target_bs, aio_context);
3866
3867 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3868 arg->has_replaces, arg->replaces, arg->sync,
3869 backing_mode, arg->has_speed, arg->speed,
3870 arg->has_granularity, arg->granularity,
3871 arg->has_buf_size, arg->buf_size,
3872 arg->has_on_source_error, arg->on_source_error,
3873 arg->has_on_target_error, arg->on_target_error,
3874 arg->has_unmap, arg->unmap,
3875 false, NULL,
3876 arg->has_copy_mode, arg->copy_mode,
3877 arg->has_auto_finalize, arg->auto_finalize,
3878 arg->has_auto_dismiss, arg->auto_dismiss,
3879 &local_err);
3880 bdrv_unref(target_bs);
3881 error_propagate(errp, local_err);
3882out:
3883 aio_context_release(aio_context);
3884}
3885
3886void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3887 const char *device, const char *target,
3888 bool has_replaces, const char *replaces,
3889 MirrorSyncMode sync,
3890 bool has_speed, int64_t speed,
3891 bool has_granularity, uint32_t granularity,
3892 bool has_buf_size, int64_t buf_size,
3893 bool has_on_source_error,
3894 BlockdevOnError on_source_error,
3895 bool has_on_target_error,
3896 BlockdevOnError on_target_error,
3897 bool has_filter_node_name,
3898 const char *filter_node_name,
3899 bool has_copy_mode, MirrorCopyMode copy_mode,
3900 bool has_auto_finalize, bool auto_finalize,
3901 bool has_auto_dismiss, bool auto_dismiss,
3902 Error **errp)
3903{
3904 BlockDriverState *bs;
3905 BlockDriverState *target_bs;
3906 AioContext *aio_context;
3907 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3908 Error *local_err = NULL;
3909
3910 bs = qmp_get_root_bs(device, errp);
3911 if (!bs) {
3912 return;
3913 }
3914
3915 target_bs = bdrv_lookup_bs(target, target, errp);
3916 if (!target_bs) {
3917 return;
3918 }
3919
3920 aio_context = bdrv_get_aio_context(bs);
3921 aio_context_acquire(aio_context);
3922
3923 bdrv_set_aio_context(target_bs, aio_context);
3924
3925 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3926 has_replaces, replaces, sync, backing_mode,
3927 has_speed, speed,
3928 has_granularity, granularity,
3929 has_buf_size, buf_size,
3930 has_on_source_error, on_source_error,
3931 has_on_target_error, on_target_error,
3932 true, true,
3933 has_filter_node_name, filter_node_name,
3934 has_copy_mode, copy_mode,
3935 has_auto_finalize, auto_finalize,
3936 has_auto_dismiss, auto_dismiss,
3937 &local_err);
3938 error_propagate(errp, local_err);
3939
3940 aio_context_release(aio_context);
3941}
3942
3943/* Get a block job using its ID and acquire its AioContext */
3944static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3945 Error **errp)
3946{
3947 BlockJob *job;
3948
3949 assert(id != NULL);
3950
3951 *aio_context = NULL;
3952
3953 job = block_job_get(id);
3954
3955 if (!job) {
3956 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3957 "Block job '%s' not found", id);
3958 return NULL;
3959 }
3960
3961 *aio_context = blk_get_aio_context(job->blk);
3962 aio_context_acquire(*aio_context);
3963
3964 return job;
3965}
3966
3967void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3968{
3969 AioContext *aio_context;
3970 BlockJob *job = find_block_job(device, &aio_context, errp);
3971
3972 if (!job) {
3973 return;
3974 }
3975
3976 block_job_set_speed(job, speed, errp);
3977 aio_context_release(aio_context);
3978}
3979
3980void qmp_block_job_cancel(const char *device,
3981 bool has_force, bool force, Error **errp)
3982{
3983 AioContext *aio_context;
3984 BlockJob *job = find_block_job(device, &aio_context, errp);
3985
3986 if (!job) {
3987 return;
3988 }
3989
3990 if (!has_force) {
3991 force = false;
3992 }
3993
3994 if (job_user_paused(&job->job) && !force) {
3995 error_setg(errp, "The block job for device '%s' is currently paused",
3996 device);
3997 goto out;
3998 }
3999
4000 trace_qmp_block_job_cancel(job);
4001 job_user_cancel(&job->job, force, errp);
4002out:
4003 aio_context_release(aio_context);
4004}
4005
4006void qmp_block_job_pause(const char *device, Error **errp)
4007{
4008 AioContext *aio_context;
4009 BlockJob *job = find_block_job(device, &aio_context, errp);
4010
4011 if (!job) {
4012 return;
4013 }
4014
4015 trace_qmp_block_job_pause(job);
4016 job_user_pause(&job->job, errp);
4017 aio_context_release(aio_context);
4018}
4019
4020void qmp_block_job_resume(const char *device, Error **errp)
4021{
4022 AioContext *aio_context;
4023 BlockJob *job = find_block_job(device, &aio_context, errp);
4024
4025 if (!job) {
4026 return;
4027 }
4028
4029 trace_qmp_block_job_resume(job);
4030 job_user_resume(&job->job, errp);
4031 aio_context_release(aio_context);
4032}
4033
4034void qmp_block_job_complete(const char *device, Error **errp)
4035{
4036 AioContext *aio_context;
4037 BlockJob *job = find_block_job(device, &aio_context, errp);
4038
4039 if (!job) {
4040 return;
4041 }
4042
4043 trace_qmp_block_job_complete(job);
4044 job_complete(&job->job, errp);
4045 aio_context_release(aio_context);
4046}
4047
4048void qmp_block_job_finalize(const char *id, Error **errp)
4049{
4050 AioContext *aio_context;
4051 BlockJob *job = find_block_job(id, &aio_context, errp);
4052
4053 if (!job) {
4054 return;
4055 }
4056
4057 trace_qmp_block_job_finalize(job);
4058 job_finalize(&job->job, errp);
4059 aio_context_release(aio_context);
4060}
4061
4062void qmp_block_job_dismiss(const char *id, Error **errp)
4063{
4064 AioContext *aio_context;
4065 BlockJob *bjob = find_block_job(id, &aio_context, errp);
4066 Job *job;
4067
4068 if (!bjob) {
4069 return;
4070 }
4071
4072 trace_qmp_block_job_dismiss(bjob);
4073 job = &bjob->job;
4074 job_dismiss(&job, errp);
4075 aio_context_release(aio_context);
4076}
4077
4078void qmp_change_backing_file(const char *device,
4079 const char *image_node_name,
4080 const char *backing_file,
4081 Error **errp)
4082{
4083 BlockDriverState *bs = NULL;
4084 AioContext *aio_context;
4085 BlockDriverState *image_bs = NULL;
4086 Error *local_err = NULL;
4087 bool ro;
4088 int open_flags;
4089 int ret;
4090
4091 bs = qmp_get_root_bs(device, errp);
4092 if (!bs) {
4093 return;
4094 }
4095
4096 aio_context = bdrv_get_aio_context(bs);
4097 aio_context_acquire(aio_context);
4098
4099 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
4100 if (local_err) {
4101 error_propagate(errp, local_err);
4102 goto out;
4103 }
4104
4105 if (!image_bs) {
4106 error_setg(errp, "image file not found");
4107 goto out;
4108 }
4109
4110 if (bdrv_find_base(image_bs) == image_bs) {
4111 error_setg(errp, "not allowing backing file change on an image "
4112 "without a backing file");
4113 goto out;
4114 }
4115
4116 /* even though we are not necessarily operating on bs, we need it to
4117 * determine if block ops are currently prohibited on the chain */
4118 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
4119 goto out;
4120 }
4121
4122 /* final sanity check */
4123 if (!bdrv_chain_contains(bs, image_bs)) {
4124 error_setg(errp, "'%s' and image file are not in the same chain",
4125 device);
4126 goto out;
4127 }
4128
4129 /* if not r/w, reopen to make r/w */
4130 open_flags = image_bs->open_flags;
4131 ro = bdrv_is_read_only(image_bs);
4132
4133 if (ro) {
4134 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
4135 if (local_err) {
4136 error_propagate(errp, local_err);
4137 goto out;
4138 }
4139 }
4140
4141 ret = bdrv_change_backing_file(image_bs, backing_file,
4142 image_bs->drv ? image_bs->drv->format_name : "");
4143
4144 if (ret < 0) {
4145 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
4146 backing_file);
4147 /* don't exit here, so we can try to restore open flags if
4148 * appropriate */
4149 }
4150
4151 if (ro) {
4152 bdrv_reopen(image_bs, open_flags, &local_err);
4153 error_propagate(errp, local_err);
4154 }
4155
4156out:
4157 aio_context_release(aio_context);
4158}
4159
4160void hmp_drive_add_node(Monitor *mon, const char *optstr)
4161{
4162 QemuOpts *opts;
4163 QDict *qdict;
4164 Error *local_err = NULL;
4165
4166 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
4167 if (!opts) {
4168 return;
4169 }
4170
4171 qdict = qemu_opts_to_qdict(opts, NULL);
4172
4173 if (!qdict_get_try_str(qdict, "node-name")) {
4174 qobject_unref(qdict);
4175 error_report("'node-name' needs to be specified");
4176 goto out;
4177 }
4178
4179 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
4180 if (!bs) {
4181 error_report_err(local_err);
4182 goto out;
4183 }
4184
4185 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4186
4187out:
4188 qemu_opts_del(opts);
4189}
4190
4191void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
4192{
4193 BlockDriverState *bs;
4194 QObject *obj;
4195 Visitor *v = qobject_output_visitor_new(&obj);
4196 QDict *qdict;
4197 Error *local_err = NULL;
4198
4199 visit_type_BlockdevOptions(v, NULL, &options, &local_err);
4200 if (local_err) {
4201 error_propagate(errp, local_err);
4202 goto fail;
4203 }
4204
4205 visit_complete(v, &obj);
4206 qdict = qobject_to(QDict, obj);
4207
4208 qdict_flatten(qdict);
4209
4210 if (!qdict_get_try_str(qdict, "node-name")) {
4211 error_setg(errp, "'node-name' must be specified for the root node");
4212 goto fail;
4213 }
4214
4215 bs = bds_tree_init(qdict, errp);
4216 if (!bs) {
4217 goto fail;
4218 }
4219
4220 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4221
4222fail:
4223 visit_free(v);
4224}
4225
4226void qmp_blockdev_del(const char *node_name, Error **errp)
4227{
4228 AioContext *aio_context;
4229 BlockDriverState *bs;
4230
4231 bs = bdrv_find_node(node_name);
4232 if (!bs) {
4233 error_setg(errp, "Cannot find node %s", node_name);
4234 return;
4235 }
4236 if (bdrv_has_blk(bs)) {
4237 error_setg(errp, "Node %s is in use", node_name);
4238 return;
4239 }
4240 aio_context = bdrv_get_aio_context(bs);
4241 aio_context_acquire(aio_context);
4242
4243 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4244 goto out;
4245 }
4246
4247 if (!bs->monitor_list.tqe_prev) {
4248 error_setg(errp, "Node %s is not owned by the monitor",
4249 bs->node_name);
4250 goto out;
4251 }
4252
4253 if (bs->refcnt > 1) {
4254 error_setg(errp, "Block device %s is in use",
4255 bdrv_get_device_or_node_name(bs));
4256 goto out;
4257 }
4258
4259 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4260 bdrv_unref(bs);
4261
4262out:
4263 aio_context_release(aio_context);
4264}
4265
4266static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
4267 const char *child_name)
4268{
4269 BdrvChild *child;
4270
4271 QLIST_FOREACH(child, &parent_bs->children, next) {
4272 if (strcmp(child->name, child_name) == 0) {
4273 return child;
4274 }
4275 }
4276
4277 return NULL;
4278}
4279
4280void qmp_x_blockdev_change(const char *parent, bool has_child,
4281 const char *child, bool has_node,
4282 const char *node, Error **errp)
4283{
4284 BlockDriverState *parent_bs, *new_bs = NULL;
4285 BdrvChild *p_child;
4286
4287 parent_bs = bdrv_lookup_bs(parent, parent, errp);
4288 if (!parent_bs) {
4289 return;
4290 }
4291
4292 if (has_child == has_node) {
4293 if (has_child) {
4294 error_setg(errp, "The parameters child and node are in conflict");
4295 } else {
4296 error_setg(errp, "Either child or node must be specified");
4297 }
4298 return;
4299 }
4300
4301 if (has_child) {
4302 p_child = bdrv_find_child(parent_bs, child);
4303 if (!p_child) {
4304 error_setg(errp, "Node '%s' does not have child '%s'",
4305 parent, child);
4306 return;
4307 }
4308 bdrv_del_child(parent_bs, p_child, errp);
4309 }
4310
4311 if (has_node) {
4312 new_bs = bdrv_find_node(node);
4313 if (!new_bs) {
4314 error_setg(errp, "Node '%s' not found", node);
4315 return;
4316 }
4317 bdrv_add_child(parent_bs, new_bs, errp);
4318 }
4319}
4320
4321BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4322{
4323 BlockJobInfoList *head = NULL, **p_next = &head;
4324 BlockJob *job;
4325
4326 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
4327 BlockJobInfoList *elem;
4328 AioContext *aio_context;
4329
4330 if (block_job_is_internal(job)) {
4331 continue;
4332 }
4333 elem = g_new0(BlockJobInfoList, 1);
4334 aio_context = blk_get_aio_context(job->blk);
4335 aio_context_acquire(aio_context);
4336 elem->value = block_job_query(job, errp);
4337 aio_context_release(aio_context);
4338 if (!elem->value) {
4339 g_free(elem);
4340 qapi_free_BlockJobInfoList(head);
4341 return NULL;
4342 }
4343 *p_next = elem;
4344 p_next = &elem->next;
4345 }
4346
4347 return head;
4348}
4349
4350void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
4351 bool has_force, bool force, Error **errp)
4352{
4353 AioContext *old_context;
4354 AioContext *new_context;
4355 BlockDriverState *bs;
4356
4357 bs = bdrv_find_node(node_name);
4358 if (!bs) {
4359 error_setg(errp, "Cannot find node %s", node_name);
4360 return;
4361 }
4362
4363 /* Protects against accidents. */
4364 if (!(has_force && force) && bdrv_has_blk(bs)) {
4365 error_setg(errp, "Node %s is associated with a BlockBackend and could "
4366 "be in use (use force=true to override this check)",
4367 node_name);
4368 return;
4369 }
4370
4371 if (iothread->type == QTYPE_QSTRING) {
4372 IOThread *obj = iothread_by_id(iothread->u.s);
4373 if (!obj) {
4374 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
4375 return;
4376 }
4377
4378 new_context = iothread_get_aio_context(obj);
4379 } else {
4380 new_context = qemu_get_aio_context();
4381 }
4382
4383 old_context = bdrv_get_aio_context(bs);
4384 aio_context_acquire(old_context);
4385
4386 bdrv_set_aio_context(bs, new_context);
4387
4388 aio_context_release(old_context);
4389}
4390
4391void qmp_x_block_latency_histogram_set(
4392 const char *device,
4393 bool has_boundaries, uint64List *boundaries,
4394 bool has_boundaries_read, uint64List *boundaries_read,
4395 bool has_boundaries_write, uint64List *boundaries_write,
4396 bool has_boundaries_flush, uint64List *boundaries_flush,
4397 Error **errp)
4398{
4399 BlockBackend *blk = blk_by_name(device);
4400 BlockAcctStats *stats;
4401
4402 if (!blk) {
4403 error_setg(errp, "Device '%s' not found", device);
4404 return;
4405 }
4406 stats = blk_get_stats(blk);
4407
4408 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write &&
4409 !has_boundaries_flush)
4410 {
4411 block_latency_histograms_clear(stats);
4412 return;
4413 }
4414
4415 if (has_boundaries || has_boundaries_read) {
4416 block_latency_histogram_set(
4417 stats, BLOCK_ACCT_READ,
4418 has_boundaries_read ? boundaries_read : boundaries);
4419 }
4420
4421 if (has_boundaries || has_boundaries_write) {
4422 block_latency_histogram_set(
4423 stats, BLOCK_ACCT_WRITE,
4424 has_boundaries_write ? boundaries_write : boundaries);
4425 }
4426
4427 if (has_boundaries || has_boundaries_flush) {
4428 block_latency_histogram_set(
4429 stats, BLOCK_ACCT_FLUSH,
4430 has_boundaries_flush ? boundaries_flush : boundaries);
4431 }
4432}
4433
4434QemuOptsList qemu_common_drive_opts = {
4435 .name = "drive",
4436 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4437 .desc = {
4438 {
4439 .name = "snapshot",
4440 .type = QEMU_OPT_BOOL,
4441 .help = "enable/disable snapshot mode",
4442 },{
4443 .name = "aio",
4444 .type = QEMU_OPT_STRING,
4445 .help = "host AIO implementation (threads, native)",
4446 },{
4447 .name = BDRV_OPT_CACHE_WB,
4448 .type = QEMU_OPT_BOOL,
4449 .help = "Enable writeback mode",
4450 },{
4451 .name = "format",
4452 .type = QEMU_OPT_STRING,
4453 .help = "disk format (raw, qcow2, ...)",
4454 },{
4455 .name = "rerror",
4456 .type = QEMU_OPT_STRING,
4457 .help = "read error action",
4458 },{
4459 .name = "werror",
4460 .type = QEMU_OPT_STRING,
4461 .help = "write error action",
4462 },{
4463 .name = BDRV_OPT_READ_ONLY,
4464 .type = QEMU_OPT_BOOL,
4465 .help = "open drive file as read-only",
4466 },
4467
4468 THROTTLE_OPTS,
4469
4470 {
4471 .name = "throttling.group",
4472 .type = QEMU_OPT_STRING,
4473 .help = "name of the block throttling group",
4474 },{
4475 .name = "copy-on-read",
4476 .type = QEMU_OPT_BOOL,
4477 .help = "copy read data from backing file into image file",
4478 },{
4479 .name = "detect-zeroes",
4480 .type = QEMU_OPT_STRING,
4481 .help = "try to optimize zero writes (off, on, unmap)",
4482 },{
4483 .name = "stats-account-invalid",
4484 .type = QEMU_OPT_BOOL,
4485 .help = "whether to account for invalid I/O operations "
4486 "in the statistics",
4487 },{
4488 .name = "stats-account-failed",
4489 .type = QEMU_OPT_BOOL,
4490 .help = "whether to account for failed I/O operations "
4491 "in the statistics",
4492 },
4493 { /* end of list */ }
4494 },
4495};
4496
4497QemuOptsList qemu_drive_opts = {
4498 .name = "drive",
4499 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4500 .desc = {
4501 /*
4502 * no elements => accept any params
4503 * validation will happen later
4504 */
4505 { /* end of list */ }
4506 },
4507};
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