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ivshmem: Fix unplug of device "ivshmem-plain"
[qemu/armbru.git] / blockdev.c
bloba8755bd90876f559e5cc7228ff3c1733f8314636
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
64 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
65 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
66
67 static int do_open_tray(const char *blk_name, const char *qdev_id,
68 bool force, Error **errp);
69 static void blockdev_remove_medium(bool has_device, const char *device,
70 bool has_id, const char *id, Error **errp);
71 static 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
75 static 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
87 static 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 */
110 void 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 */
139 void 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
163 void 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 */
181 int 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
190 static 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
196 static 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
202 QemuOpts *drive_def(const char *optstr)
203 {
204 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
205 }
206
207 QemuOpts *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
227 DriveInfo *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
243 void 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
269 DriveInfo *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
276 int 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. */
295 DriveInfo *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
302 static void bdrv_format_print(void *opaque, const char *name)
303 {
304 error_printf(" %s", name);
305 }
306
307 typedef struct {
308 QEMUBH *bh;
309 BlockDriverState *bs;
310 } BDRVPutRefBH;
311
312 static 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
329 static 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
370 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
371
372 /* All parameters but @opts are optional and may be set to NULL. */
373 static 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 */
465 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
466 Error **errp)
467 {
468 const char *buf;
469 int bdrv_flags = 0;
470 int on_read_error, on_write_error;
471 bool account_invalid, account_failed;
472 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
634 err_no_bs_opts:
635 qemu_opts_del(opts);
636 qobject_unref(interval_dict);
637 qobject_unref(interval_list);
638 return blk;
639
640 early_err:
641 qemu_opts_del(opts);
642 qobject_unref(interval_dict);
643 qobject_unref(interval_list);
644 err_no_opts:
645 qobject_unref(bs_opts);
646 return NULL;
647 }
648
649 /* Takes the ownership of bs_opts */
650 static 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
668 void 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 */
682 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
683 {
684 return bs ? QTAILQ_NEXT(bs, monitor_list)
685 : QTAILQ_FIRST(&monitor_bdrv_states);
686 }
687
688 static 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
709 QemuOptsList 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
762 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
763 {
764 const char *value;
765 BlockBackend *blk;
766 DriveInfo *dinfo = NULL;
767 QDict *bs_opts;
768 QemuOpts *legacy_opts;
769 DriveMediaType media = MEDIA_DISK;
770 BlockInterfaceType type;
771 int max_devs, bus_id, unit_id, index;
772 const char *werror, *rerror;
773 bool read_only = false;
774 bool copy_on_read;
775 const char *filename;
776 Error *local_err = NULL;
777 int i;
778
779 /* Change legacy command line options into QMP ones */
780 static const struct {
781 const char *from;
782 const char *to;
783 } opt_renames[] = {
784 { "iops", "throttling.iops-total" },
785 { "iops_rd", "throttling.iops-read" },
786 { "iops_wr", "throttling.iops-write" },
787
788 { "bps", "throttling.bps-total" },
789 { "bps_rd", "throttling.bps-read" },
790 { "bps_wr", "throttling.bps-write" },
791
792 { "iops_max", "throttling.iops-total-max" },
793 { "iops_rd_max", "throttling.iops-read-max" },
794 { "iops_wr_max", "throttling.iops-write-max" },
795
796 { "bps_max", "throttling.bps-total-max" },
797 { "bps_rd_max", "throttling.bps-read-max" },
798 { "bps_wr_max", "throttling.bps-write-max" },
799
800 { "iops_size", "throttling.iops-size" },
801
802 { "group", "throttling.group" },
803
804 { "readonly", BDRV_OPT_READ_ONLY },
805 };
806
807 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
808 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
809 &local_err);
810 if (local_err) {
811 error_report_err(local_err);
812 return NULL;
813 }
814 }
815
816 value = qemu_opt_get(all_opts, "cache");
817 if (value) {
818 int flags = 0;
819 bool writethrough;
820
821 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
822 error_report("invalid cache option");
823 return NULL;
824 }
825
826 /* Specific options take precedence */
827 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
828 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
829 !writethrough, &error_abort);
830 }
831 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
832 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
833 !!(flags & BDRV_O_NOCACHE), &error_abort);
834 }
835 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
836 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
837 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
838 }
839 qemu_opt_unset(all_opts, "cache");
840 }
841
842 /* Get a QDict for processing the options */
843 bs_opts = qdict_new();
844 qemu_opts_to_qdict(all_opts, bs_opts);
845
846 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
847 &error_abort);
848 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
849 if (local_err) {
850 error_report_err(local_err);
851 goto fail;
852 }
853
854 /* Media type */
855 value = qemu_opt_get(legacy_opts, "media");
856 if (value) {
857 if (!strcmp(value, "disk")) {
858 media = MEDIA_DISK;
859 } else if (!strcmp(value, "cdrom")) {
860 media = MEDIA_CDROM;
861 read_only = true;
862 } else {
863 error_report("'%s' invalid media", value);
864 goto fail;
865 }
866 }
867
868 /* copy-on-read is disabled with a warning for read-only devices */
869 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
870 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
871
872 if (read_only && copy_on_read) {
873 warn_report("disabling copy-on-read on read-only drive");
874 copy_on_read = false;
875 }
876
877 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
878 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
879
880 /* Controller type */
881 value = qemu_opt_get(legacy_opts, "if");
882 if (value) {
883 for (type = 0;
884 type < IF_COUNT && strcmp(value, if_name[type]);
885 type++) {
886 }
887 if (type == IF_COUNT) {
888 error_report("unsupported bus type '%s'", value);
889 goto fail;
890 }
891 } else {
892 type = block_default_type;
893 }
894
895 /* Device address specified by bus/unit or index.
896 * If none was specified, try to find the first free one. */
897 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
898 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
899 index = qemu_opt_get_number(legacy_opts, "index", -1);
900
901 max_devs = if_max_devs[type];
902
903 if (index != -1) {
904 if (bus_id != 0 || unit_id != -1) {
905 error_report("index cannot be used with bus and unit");
906 goto fail;
907 }
908 bus_id = drive_index_to_bus_id(type, index);
909 unit_id = drive_index_to_unit_id(type, index);
910 }
911
912 if (unit_id == -1) {
913 unit_id = 0;
914 while (drive_get(type, bus_id, unit_id) != NULL) {
915 unit_id++;
916 if (max_devs && unit_id >= max_devs) {
917 unit_id -= max_devs;
918 bus_id++;
919 }
920 }
921 }
922
923 if (max_devs && unit_id >= max_devs) {
924 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
925 goto fail;
926 }
927
928 if (drive_get(type, bus_id, unit_id) != NULL) {
929 error_report("drive with bus=%d, unit=%d (index=%d) exists",
930 bus_id, unit_id, index);
931 goto fail;
932 }
933
934 /* no id supplied -> create one */
935 if (qemu_opts_id(all_opts) == NULL) {
936 char *new_id;
937 const char *mediastr = "";
938 if (type == IF_IDE || type == IF_SCSI) {
939 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
940 }
941 if (max_devs) {
942 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
943 mediastr, unit_id);
944 } else {
945 new_id = g_strdup_printf("%s%s%i", if_name[type],
946 mediastr, unit_id);
947 }
948 qdict_put_str(bs_opts, "id", new_id);
949 g_free(new_id);
950 }
951
952 /* Add virtio block device */
953 if (type == IF_VIRTIO) {
954 QemuOpts *devopts;
955 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
956 &error_abort);
957 if (arch_type == QEMU_ARCH_S390X) {
958 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
959 } else {
960 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
961 }
962 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
963 &error_abort);
964 }
965
966 filename = qemu_opt_get(legacy_opts, "file");
967
968 /* Check werror/rerror compatibility with if=... */
969 werror = qemu_opt_get(legacy_opts, "werror");
970 if (werror != NULL) {
971 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
972 type != IF_NONE) {
973 error_report("werror is not supported by this bus type");
974 goto fail;
975 }
976 qdict_put_str(bs_opts, "werror", werror);
977 }
978
979 rerror = qemu_opt_get(legacy_opts, "rerror");
980 if (rerror != NULL) {
981 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
982 type != IF_NONE) {
983 error_report("rerror is not supported by this bus type");
984 goto fail;
985 }
986 qdict_put_str(bs_opts, "rerror", rerror);
987 }
988
989 /* Actual block device init: Functionality shared with blockdev-add */
990 blk = blockdev_init(filename, bs_opts, &local_err);
991 bs_opts = NULL;
992 if (!blk) {
993 if (local_err) {
994 error_report_err(local_err);
995 }
996 goto fail;
997 } else {
998 assert(!local_err);
999 }
1000
1001 /* Create legacy DriveInfo */
1002 dinfo = g_malloc0(sizeof(*dinfo));
1003 dinfo->opts = all_opts;
1004
1005 dinfo->type = type;
1006 dinfo->bus = bus_id;
1007 dinfo->unit = unit_id;
1008
1009 blk_set_legacy_dinfo(blk, dinfo);
1010
1011 switch(type) {
1012 case IF_IDE:
1013 case IF_SCSI:
1014 case IF_XEN:
1015 case IF_NONE:
1016 dinfo->media_cd = media == MEDIA_CDROM;
1017 break;
1018 default:
1019 break;
1020 }
1021
1022 fail:
1023 qemu_opts_del(legacy_opts);
1024 qobject_unref(bs_opts);
1025 return dinfo;
1026 }
1027
1028 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1029 {
1030 BlockDriverState *bs;
1031
1032 bs = bdrv_lookup_bs(name, name, errp);
1033 if (bs == NULL) {
1034 return NULL;
1035 }
1036
1037 if (!bdrv_is_root_node(bs)) {
1038 error_setg(errp, "Need a root block node");
1039 return NULL;
1040 }
1041
1042 if (!bdrv_is_inserted(bs)) {
1043 error_setg(errp, "Device has no medium");
1044 return NULL;
1045 }
1046
1047 return bs;
1048 }
1049
1050 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id,
1051 Error **errp)
1052 {
1053 BlockBackend *blk;
1054
1055 if (!blk_name == !qdev_id) {
1056 error_setg(errp, "Need exactly one of 'device' and 'id'");
1057 return NULL;
1058 }
1059
1060 if (qdev_id) {
1061 blk = blk_by_qdev_id(qdev_id, errp);
1062 } else {
1063 blk = blk_by_name(blk_name);
1064 if (blk == NULL) {
1065 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1066 "Device '%s' not found", blk_name);
1067 }
1068 }
1069
1070 return blk;
1071 }
1072
1073 void hmp_commit(Monitor *mon, const QDict *qdict)
1074 {
1075 const char *device = qdict_get_str(qdict, "device");
1076 BlockBackend *blk;
1077 int ret;
1078
1079 if (!strcmp(device, "all")) {
1080 ret = blk_commit_all();
1081 } else {
1082 BlockDriverState *bs;
1083 AioContext *aio_context;
1084
1085 blk = blk_by_name(device);
1086 if (!blk) {
1087 monitor_printf(mon, "Device '%s' not found\n", device);
1088 return;
1089 }
1090 if (!blk_is_available(blk)) {
1091 monitor_printf(mon, "Device '%s' has no medium\n", device);
1092 return;
1093 }
1094
1095 bs = blk_bs(blk);
1096 aio_context = bdrv_get_aio_context(bs);
1097 aio_context_acquire(aio_context);
1098
1099 ret = bdrv_commit(bs);
1100
1101 aio_context_release(aio_context);
1102 }
1103 if (ret < 0) {
1104 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1105 strerror(-ret));
1106 }
1107 }
1108
1109 static void blockdev_do_action(TransactionAction *action, Error **errp)
1110 {
1111 TransactionActionList list;
1112
1113 list.value = action;
1114 list.next = NULL;
1115 qmp_transaction(&list, false, NULL, errp);
1116 }
1117
1118 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1119 bool has_node_name, const char *node_name,
1120 const char *snapshot_file,
1121 bool has_snapshot_node_name,
1122 const char *snapshot_node_name,
1123 bool has_format, const char *format,
1124 bool has_mode, NewImageMode mode, Error **errp)
1125 {
1126 BlockdevSnapshotSync snapshot = {
1127 .has_device = has_device,
1128 .device = (char *) device,
1129 .has_node_name = has_node_name,
1130 .node_name = (char *) node_name,
1131 .snapshot_file = (char *) snapshot_file,
1132 .has_snapshot_node_name = has_snapshot_node_name,
1133 .snapshot_node_name = (char *) snapshot_node_name,
1134 .has_format = has_format,
1135 .format = (char *) format,
1136 .has_mode = has_mode,
1137 .mode = mode,
1138 };
1139 TransactionAction action = {
1140 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1141 .u.blockdev_snapshot_sync.data = &snapshot,
1142 };
1143 blockdev_do_action(&action, errp);
1144 }
1145
1146 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1147 Error **errp)
1148 {
1149 BlockdevSnapshot snapshot_data = {
1150 .node = (char *) node,
1151 .overlay = (char *) overlay
1152 };
1153 TransactionAction action = {
1154 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1155 .u.blockdev_snapshot.data = &snapshot_data,
1156 };
1157 blockdev_do_action(&action, errp);
1158 }
1159
1160 void qmp_blockdev_snapshot_internal_sync(const char *device,
1161 const char *name,
1162 Error **errp)
1163 {
1164 BlockdevSnapshotInternal snapshot = {
1165 .device = (char *) device,
1166 .name = (char *) name
1167 };
1168 TransactionAction action = {
1169 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1170 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1171 };
1172 blockdev_do_action(&action, errp);
1173 }
1174
1175 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1176 bool has_id,
1177 const char *id,
1178 bool has_name,
1179 const char *name,
1180 Error **errp)
1181 {
1182 BlockDriverState *bs;
1183 AioContext *aio_context;
1184 QEMUSnapshotInfo sn;
1185 Error *local_err = NULL;
1186 SnapshotInfo *info = NULL;
1187 int ret;
1188
1189 bs = qmp_get_root_bs(device, errp);
1190 if (!bs) {
1191 return NULL;
1192 }
1193 aio_context = bdrv_get_aio_context(bs);
1194 aio_context_acquire(aio_context);
1195
1196 if (!has_id) {
1197 id = NULL;
1198 }
1199
1200 if (!has_name) {
1201 name = NULL;
1202 }
1203
1204 if (!id && !name) {
1205 error_setg(errp, "Name or id must be provided");
1206 goto out_aio_context;
1207 }
1208
1209 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1210 goto out_aio_context;
1211 }
1212
1213 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1214 if (local_err) {
1215 error_propagate(errp, local_err);
1216 goto out_aio_context;
1217 }
1218 if (!ret) {
1219 error_setg(errp,
1220 "Snapshot with id '%s' and name '%s' does not exist on "
1221 "device '%s'",
1222 STR_OR_NULL(id), STR_OR_NULL(name), device);
1223 goto out_aio_context;
1224 }
1225
1226 bdrv_snapshot_delete(bs, id, name, &local_err);
1227 if (local_err) {
1228 error_propagate(errp, local_err);
1229 goto out_aio_context;
1230 }
1231
1232 aio_context_release(aio_context);
1233
1234 info = g_new0(SnapshotInfo, 1);
1235 info->id = g_strdup(sn.id_str);
1236 info->name = g_strdup(sn.name);
1237 info->date_nsec = sn.date_nsec;
1238 info->date_sec = sn.date_sec;
1239 info->vm_state_size = sn.vm_state_size;
1240 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1241 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1242
1243 return info;
1244
1245 out_aio_context:
1246 aio_context_release(aio_context);
1247 return NULL;
1248 }
1249
1250 /**
1251 * block_dirty_bitmap_lookup:
1252 * Return a dirty bitmap (if present), after validating
1253 * the node reference and bitmap names.
1254 *
1255 * @node: The name of the BDS node to search for bitmaps
1256 * @name: The name of the bitmap to search for
1257 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1258 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1259 * @errp: Output pointer for error information. Can be NULL.
1260 *
1261 * @return: A bitmap object on success, or NULL on failure.
1262 */
1263 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1264 const char *name,
1265 BlockDriverState **pbs,
1266 Error **errp)
1267 {
1268 BlockDriverState *bs;
1269 BdrvDirtyBitmap *bitmap;
1270
1271 if (!node) {
1272 error_setg(errp, "Node cannot be NULL");
1273 return NULL;
1274 }
1275 if (!name) {
1276 error_setg(errp, "Bitmap name cannot be NULL");
1277 return NULL;
1278 }
1279 bs = bdrv_lookup_bs(node, node, NULL);
1280 if (!bs) {
1281 error_setg(errp, "Node '%s' not found", node);
1282 return NULL;
1283 }
1284
1285 bitmap = bdrv_find_dirty_bitmap(bs, name);
1286 if (!bitmap) {
1287 error_setg(errp, "Dirty bitmap '%s' not found", name);
1288 return NULL;
1289 }
1290
1291 if (pbs) {
1292 *pbs = bs;
1293 }
1294
1295 return bitmap;
1296 }
1297
1298 /* New and old BlockDriverState structs for atomic group operations */
1299
1300 typedef struct BlkActionState BlkActionState;
1301
1302 /**
1303 * BlkActionOps:
1304 * Table of operations that define an Action.
1305 *
1306 * @instance_size: Size of state struct, in bytes.
1307 * @prepare: Prepare the work, must NOT be NULL.
1308 * @commit: Commit the changes, can be NULL.
1309 * @abort: Abort the changes on fail, can be NULL.
1310 * @clean: Clean up resources after all transaction actions have called
1311 * commit() or abort(). Can be NULL.
1312 *
1313 * Only prepare() may fail. In a single transaction, only one of commit() or
1314 * abort() will be called. clean() will always be called if it is present.
1315 */
1316 typedef struct BlkActionOps {
1317 size_t instance_size;
1318 void (*prepare)(BlkActionState *common, Error **errp);
1319 void (*commit)(BlkActionState *common);
1320 void (*abort)(BlkActionState *common);
1321 void (*clean)(BlkActionState *common);
1322 } BlkActionOps;
1323
1324 /**
1325 * BlkActionState:
1326 * Describes one Action's state within a Transaction.
1327 *
1328 * @action: QAPI-defined enum identifying which Action to perform.
1329 * @ops: Table of ActionOps this Action can perform.
1330 * @block_job_txn: Transaction which this action belongs to.
1331 * @entry: List membership for all Actions in this Transaction.
1332 *
1333 * This structure must be arranged as first member in a subclassed type,
1334 * assuming that the compiler will also arrange it to the same offsets as the
1335 * base class.
1336 */
1337 struct BlkActionState {
1338 TransactionAction *action;
1339 const BlkActionOps *ops;
1340 JobTxn *block_job_txn;
1341 TransactionProperties *txn_props;
1342 QSIMPLEQ_ENTRY(BlkActionState) entry;
1343 };
1344
1345 /* internal snapshot private data */
1346 typedef struct InternalSnapshotState {
1347 BlkActionState common;
1348 BlockDriverState *bs;
1349 QEMUSnapshotInfo sn;
1350 bool created;
1351 } InternalSnapshotState;
1352
1353
1354 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1355 {
1356 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1357 error_setg(errp,
1358 "Action '%s' does not support Transaction property "
1359 "completion-mode = %s",
1360 TransactionActionKind_str(s->action->type),
1361 ActionCompletionMode_str(s->txn_props->completion_mode));
1362 return -1;
1363 }
1364 return 0;
1365 }
1366
1367 static void internal_snapshot_prepare(BlkActionState *common,
1368 Error **errp)
1369 {
1370 Error *local_err = NULL;
1371 const char *device;
1372 const char *name;
1373 BlockDriverState *bs;
1374 QEMUSnapshotInfo old_sn, *sn;
1375 bool ret;
1376 qemu_timeval tv;
1377 BlockdevSnapshotInternal *internal;
1378 InternalSnapshotState *state;
1379 AioContext *aio_context;
1380 int ret1;
1381
1382 g_assert(common->action->type ==
1383 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1384 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1385 state = DO_UPCAST(InternalSnapshotState, common, common);
1386
1387 /* 1. parse input */
1388 device = internal->device;
1389 name = internal->name;
1390
1391 /* 2. check for validation */
1392 if (action_check_completion_mode(common, errp) < 0) {
1393 return;
1394 }
1395
1396 bs = qmp_get_root_bs(device, errp);
1397 if (!bs) {
1398 return;
1399 }
1400
1401 aio_context = bdrv_get_aio_context(bs);
1402 aio_context_acquire(aio_context);
1403
1404 state->bs = bs;
1405
1406 /* Paired with .clean() */
1407 bdrv_drained_begin(bs);
1408
1409 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1410 goto out;
1411 }
1412
1413 if (bdrv_is_read_only(bs)) {
1414 error_setg(errp, "Device '%s' is read only", device);
1415 goto out;
1416 }
1417
1418 if (!bdrv_can_snapshot(bs)) {
1419 error_setg(errp, "Block format '%s' used by device '%s' "
1420 "does not support internal snapshots",
1421 bs->drv->format_name, device);
1422 goto out;
1423 }
1424
1425 if (!strlen(name)) {
1426 error_setg(errp, "Name is empty");
1427 goto out;
1428 }
1429
1430 /* check whether a snapshot with name exist */
1431 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1432 &local_err);
1433 if (local_err) {
1434 error_propagate(errp, local_err);
1435 goto out;
1436 } else if (ret) {
1437 error_setg(errp,
1438 "Snapshot with name '%s' already exists on device '%s'",
1439 name, device);
1440 goto out;
1441 }
1442
1443 /* 3. take the snapshot */
1444 sn = &state->sn;
1445 pstrcpy(sn->name, sizeof(sn->name), name);
1446 qemu_gettimeofday(&tv);
1447 sn->date_sec = tv.tv_sec;
1448 sn->date_nsec = tv.tv_usec * 1000;
1449 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1450
1451 ret1 = bdrv_snapshot_create(bs, sn);
1452 if (ret1 < 0) {
1453 error_setg_errno(errp, -ret1,
1454 "Failed to create snapshot '%s' on device '%s'",
1455 name, device);
1456 goto out;
1457 }
1458
1459 /* 4. succeed, mark a snapshot is created */
1460 state->created = true;
1461
1462 out:
1463 aio_context_release(aio_context);
1464 }
1465
1466 static void internal_snapshot_abort(BlkActionState *common)
1467 {
1468 InternalSnapshotState *state =
1469 DO_UPCAST(InternalSnapshotState, common, common);
1470 BlockDriverState *bs = state->bs;
1471 QEMUSnapshotInfo *sn = &state->sn;
1472 AioContext *aio_context;
1473 Error *local_error = NULL;
1474
1475 if (!state->created) {
1476 return;
1477 }
1478
1479 aio_context = bdrv_get_aio_context(state->bs);
1480 aio_context_acquire(aio_context);
1481
1482 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1483 error_reportf_err(local_error,
1484 "Failed to delete snapshot with id '%s' and "
1485 "name '%s' on device '%s' in abort: ",
1486 sn->id_str, sn->name,
1487 bdrv_get_device_name(bs));
1488 }
1489
1490 aio_context_release(aio_context);
1491 }
1492
1493 static void internal_snapshot_clean(BlkActionState *common)
1494 {
1495 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1496 common, common);
1497 AioContext *aio_context;
1498
1499 if (!state->bs) {
1500 return;
1501 }
1502
1503 aio_context = bdrv_get_aio_context(state->bs);
1504 aio_context_acquire(aio_context);
1505
1506 bdrv_drained_end(state->bs);
1507
1508 aio_context_release(aio_context);
1509 }
1510
1511 /* external snapshot private data */
1512 typedef struct ExternalSnapshotState {
1513 BlkActionState common;
1514 BlockDriverState *old_bs;
1515 BlockDriverState *new_bs;
1516 bool overlay_appended;
1517 } ExternalSnapshotState;
1518
1519 static void external_snapshot_prepare(BlkActionState *common,
1520 Error **errp)
1521 {
1522 int flags = 0;
1523 QDict *options = NULL;
1524 Error *local_err = NULL;
1525 /* Device and node name of the image to generate the snapshot from */
1526 const char *device;
1527 const char *node_name;
1528 /* Reference to the new image (for 'blockdev-snapshot') */
1529 const char *snapshot_ref;
1530 /* File name of the new image (for 'blockdev-snapshot-sync') */
1531 const char *new_image_file;
1532 ExternalSnapshotState *state =
1533 DO_UPCAST(ExternalSnapshotState, common, common);
1534 TransactionAction *action = common->action;
1535 AioContext *aio_context;
1536
1537 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1538 * purpose but a different set of parameters */
1539 switch (action->type) {
1540 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1541 {
1542 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1543 device = s->node;
1544 node_name = s->node;
1545 new_image_file = NULL;
1546 snapshot_ref = s->overlay;
1547 }
1548 break;
1549 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1550 {
1551 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1552 device = s->has_device ? s->device : NULL;
1553 node_name = s->has_node_name ? s->node_name : NULL;
1554 new_image_file = s->snapshot_file;
1555 snapshot_ref = NULL;
1556 }
1557 break;
1558 default:
1559 g_assert_not_reached();
1560 }
1561
1562 /* start processing */
1563 if (action_check_completion_mode(common, errp) < 0) {
1564 return;
1565 }
1566
1567 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1568 if (!state->old_bs) {
1569 return;
1570 }
1571
1572 aio_context = bdrv_get_aio_context(state->old_bs);
1573 aio_context_acquire(aio_context);
1574
1575 /* Paired with .clean() */
1576 bdrv_drained_begin(state->old_bs);
1577
1578 if (!bdrv_is_inserted(state->old_bs)) {
1579 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1580 goto out;
1581 }
1582
1583 if (bdrv_op_is_blocked(state->old_bs,
1584 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1585 goto out;
1586 }
1587
1588 if (!bdrv_is_read_only(state->old_bs)) {
1589 if (bdrv_flush(state->old_bs)) {
1590 error_setg(errp, QERR_IO_ERROR);
1591 goto out;
1592 }
1593 }
1594
1595 if (!bdrv_is_first_non_filter(state->old_bs)) {
1596 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1597 goto out;
1598 }
1599
1600 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1601 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1602 const char *format = s->has_format ? s->format : "qcow2";
1603 enum NewImageMode mode;
1604 const char *snapshot_node_name =
1605 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1606
1607 if (node_name && !snapshot_node_name) {
1608 error_setg(errp, "New snapshot node name missing");
1609 goto out;
1610 }
1611
1612 if (snapshot_node_name &&
1613 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1614 error_setg(errp, "New snapshot node name already in use");
1615 goto out;
1616 }
1617
1618 flags = state->old_bs->open_flags;
1619 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1620 flags |= BDRV_O_NO_BACKING;
1621
1622 /* create new image w/backing file */
1623 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1624 if (mode != NEW_IMAGE_MODE_EXISTING) {
1625 int64_t size = bdrv_getlength(state->old_bs);
1626 if (size < 0) {
1627 error_setg_errno(errp, -size, "bdrv_getlength failed");
1628 goto out;
1629 }
1630 bdrv_img_create(new_image_file, format,
1631 state->old_bs->filename,
1632 state->old_bs->drv->format_name,
1633 NULL, size, flags, false, &local_err);
1634 if (local_err) {
1635 error_propagate(errp, local_err);
1636 goto out;
1637 }
1638 }
1639
1640 options = qdict_new();
1641 if (s->has_snapshot_node_name) {
1642 qdict_put_str(options, "node-name", snapshot_node_name);
1643 }
1644 qdict_put_str(options, "driver", format);
1645 }
1646
1647 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1648 errp);
1649 /* We will manually add the backing_hd field to the bs later */
1650 if (!state->new_bs) {
1651 goto out;
1652 }
1653
1654 if (bdrv_has_blk(state->new_bs)) {
1655 error_setg(errp, "The snapshot is already in use");
1656 goto out;
1657 }
1658
1659 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1660 errp)) {
1661 goto out;
1662 }
1663
1664 if (state->new_bs->backing != NULL) {
1665 error_setg(errp, "The snapshot already has a backing image");
1666 goto out;
1667 }
1668
1669 if (!state->new_bs->drv->supports_backing) {
1670 error_setg(errp, "The snapshot does not support backing images");
1671 goto out;
1672 }
1673
1674 bdrv_set_aio_context(state->new_bs, aio_context);
1675
1676 /* This removes our old bs and adds the new bs. This is an operation that
1677 * can fail, so we need to do it in .prepare; undoing it for abort is
1678 * always possible. */
1679 bdrv_ref(state->new_bs);
1680 bdrv_append(state->new_bs, state->old_bs, &local_err);
1681 if (local_err) {
1682 error_propagate(errp, local_err);
1683 goto out;
1684 }
1685 state->overlay_appended = true;
1686
1687 out:
1688 aio_context_release(aio_context);
1689 }
1690
1691 static void external_snapshot_commit(BlkActionState *common)
1692 {
1693 ExternalSnapshotState *state =
1694 DO_UPCAST(ExternalSnapshotState, common, common);
1695 AioContext *aio_context;
1696
1697 aio_context = bdrv_get_aio_context(state->old_bs);
1698 aio_context_acquire(aio_context);
1699
1700 /* We don't need (or want) to use the transactional
1701 * bdrv_reopen_multiple() across all the entries at once, because we
1702 * don't want to abort all of them if one of them fails the reopen */
1703 if (!atomic_read(&state->old_bs->copy_on_read)) {
1704 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1705 NULL);
1706 }
1707
1708 aio_context_release(aio_context);
1709 }
1710
1711 static void external_snapshot_abort(BlkActionState *common)
1712 {
1713 ExternalSnapshotState *state =
1714 DO_UPCAST(ExternalSnapshotState, common, common);
1715 if (state->new_bs) {
1716 if (state->overlay_appended) {
1717 AioContext *aio_context;
1718
1719 aio_context = bdrv_get_aio_context(state->old_bs);
1720 aio_context_acquire(aio_context);
1721
1722 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1723 close state->old_bs; we need it */
1724 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1725 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1726 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1727
1728 aio_context_release(aio_context);
1729 }
1730 }
1731 }
1732
1733 static void external_snapshot_clean(BlkActionState *common)
1734 {
1735 ExternalSnapshotState *state =
1736 DO_UPCAST(ExternalSnapshotState, common, common);
1737 AioContext *aio_context;
1738
1739 if (!state->old_bs) {
1740 return;
1741 }
1742
1743 aio_context = bdrv_get_aio_context(state->old_bs);
1744 aio_context_acquire(aio_context);
1745
1746 bdrv_drained_end(state->old_bs);
1747 bdrv_unref(state->new_bs);
1748
1749 aio_context_release(aio_context);
1750 }
1751
1752 typedef struct DriveBackupState {
1753 BlkActionState common;
1754 BlockDriverState *bs;
1755 BlockJob *job;
1756 } DriveBackupState;
1757
1758 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
1759 Error **errp);
1760
1761 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1762 {
1763 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1764 BlockDriverState *bs;
1765 DriveBackup *backup;
1766 AioContext *aio_context;
1767 Error *local_err = NULL;
1768
1769 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1770 backup = common->action->u.drive_backup.data;
1771
1772 bs = qmp_get_root_bs(backup->device, errp);
1773 if (!bs) {
1774 return;
1775 }
1776
1777 aio_context = bdrv_get_aio_context(bs);
1778 aio_context_acquire(aio_context);
1779
1780 /* Paired with .clean() */
1781 bdrv_drained_begin(bs);
1782
1783 state->bs = bs;
1784
1785 state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
1786 if (local_err) {
1787 error_propagate(errp, local_err);
1788 goto out;
1789 }
1790
1791 out:
1792 aio_context_release(aio_context);
1793 }
1794
1795 static void drive_backup_commit(BlkActionState *common)
1796 {
1797 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1798 AioContext *aio_context;
1799
1800 aio_context = bdrv_get_aio_context(state->bs);
1801 aio_context_acquire(aio_context);
1802
1803 assert(state->job);
1804 job_start(&state->job->job);
1805
1806 aio_context_release(aio_context);
1807 }
1808
1809 static void drive_backup_abort(BlkActionState *common)
1810 {
1811 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1812
1813 if (state->job) {
1814 AioContext *aio_context;
1815
1816 aio_context = bdrv_get_aio_context(state->bs);
1817 aio_context_acquire(aio_context);
1818
1819 job_cancel_sync(&state->job->job);
1820
1821 aio_context_release(aio_context);
1822 }
1823 }
1824
1825 static void drive_backup_clean(BlkActionState *common)
1826 {
1827 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1828 AioContext *aio_context;
1829
1830 if (!state->bs) {
1831 return;
1832 }
1833
1834 aio_context = bdrv_get_aio_context(state->bs);
1835 aio_context_acquire(aio_context);
1836
1837 bdrv_drained_end(state->bs);
1838
1839 aio_context_release(aio_context);
1840 }
1841
1842 typedef struct BlockdevBackupState {
1843 BlkActionState common;
1844 BlockDriverState *bs;
1845 BlockJob *job;
1846 } BlockdevBackupState;
1847
1848 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
1849 Error **errp);
1850
1851 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1852 {
1853 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1854 BlockdevBackup *backup;
1855 BlockDriverState *bs, *target;
1856 AioContext *aio_context;
1857 Error *local_err = NULL;
1858
1859 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1860 backup = common->action->u.blockdev_backup.data;
1861
1862 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1863 if (!bs) {
1864 return;
1865 }
1866
1867 target = bdrv_lookup_bs(backup->target, backup->target, errp);
1868 if (!target) {
1869 return;
1870 }
1871
1872 aio_context = bdrv_get_aio_context(bs);
1873 if (aio_context != bdrv_get_aio_context(target)) {
1874 error_setg(errp, "Backup between two IO threads is not implemented");
1875 return;
1876 }
1877 aio_context_acquire(aio_context);
1878 state->bs = bs;
1879
1880 /* Paired with .clean() */
1881 bdrv_drained_begin(state->bs);
1882
1883 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
1884 if (local_err) {
1885 error_propagate(errp, local_err);
1886 goto out;
1887 }
1888
1889 out:
1890 aio_context_release(aio_context);
1891 }
1892
1893 static void blockdev_backup_commit(BlkActionState *common)
1894 {
1895 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1896 AioContext *aio_context;
1897
1898 aio_context = bdrv_get_aio_context(state->bs);
1899 aio_context_acquire(aio_context);
1900
1901 assert(state->job);
1902 job_start(&state->job->job);
1903
1904 aio_context_release(aio_context);
1905 }
1906
1907 static void blockdev_backup_abort(BlkActionState *common)
1908 {
1909 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1910
1911 if (state->job) {
1912 AioContext *aio_context;
1913
1914 aio_context = bdrv_get_aio_context(state->bs);
1915 aio_context_acquire(aio_context);
1916
1917 job_cancel_sync(&state->job->job);
1918
1919 aio_context_release(aio_context);
1920 }
1921 }
1922
1923 static void blockdev_backup_clean(BlkActionState *common)
1924 {
1925 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1926 AioContext *aio_context;
1927
1928 if (!state->bs) {
1929 return;
1930 }
1931
1932 aio_context = bdrv_get_aio_context(state->bs);
1933 aio_context_acquire(aio_context);
1934
1935 bdrv_drained_end(state->bs);
1936
1937 aio_context_release(aio_context);
1938 }
1939
1940 typedef struct BlockDirtyBitmapState {
1941 BlkActionState common;
1942 BdrvDirtyBitmap *bitmap;
1943 BlockDriverState *bs;
1944 HBitmap *backup;
1945 bool prepared;
1946 bool was_enabled;
1947 } BlockDirtyBitmapState;
1948
1949 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
1950 Error **errp)
1951 {
1952 Error *local_err = NULL;
1953 BlockDirtyBitmapAdd *action;
1954 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1955 common, common);
1956
1957 if (action_check_completion_mode(common, errp) < 0) {
1958 return;
1959 }
1960
1961 action = common->action->u.block_dirty_bitmap_add.data;
1962 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1963 qmp_block_dirty_bitmap_add(action->node, action->name,
1964 action->has_granularity, action->granularity,
1965 action->has_persistent, action->persistent,
1966 action->has_autoload, action->autoload,
1967 action->has_x_disabled, action->x_disabled,
1968 &local_err);
1969
1970 if (!local_err) {
1971 state->prepared = true;
1972 } else {
1973 error_propagate(errp, local_err);
1974 }
1975 }
1976
1977 static void block_dirty_bitmap_add_abort(BlkActionState *common)
1978 {
1979 BlockDirtyBitmapAdd *action;
1980 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1981 common, common);
1982
1983 action = common->action->u.block_dirty_bitmap_add.data;
1984 /* Should not be able to fail: IF the bitmap was added via .prepare(),
1985 * then the node reference and bitmap name must have been valid.
1986 */
1987 if (state->prepared) {
1988 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
1989 }
1990 }
1991
1992 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
1993 Error **errp)
1994 {
1995 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1996 common, common);
1997 BlockDirtyBitmap *action;
1998
1999 if (action_check_completion_mode(common, errp) < 0) {
2000 return;
2001 }
2002
2003 action = common->action->u.block_dirty_bitmap_clear.data;
2004 state->bitmap = block_dirty_bitmap_lookup(action->node,
2005 action->name,
2006 &state->bs,
2007 errp);
2008 if (!state->bitmap) {
2009 return;
2010 }
2011
2012 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2013 error_setg(errp, "Cannot modify a frozen bitmap");
2014 return;
2015 } else if (bdrv_dirty_bitmap_qmp_locked(state->bitmap)) {
2016 error_setg(errp, "Cannot modify a locked bitmap");
2017 return;
2018 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2019 error_setg(errp, "Cannot clear a disabled bitmap");
2020 return;
2021 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
2022 error_setg(errp, "Cannot clear a readonly bitmap");
2023 return;
2024 }
2025
2026 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2027 }
2028
2029 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2030 {
2031 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2032 common, common);
2033
2034 if (state->backup) {
2035 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2036 }
2037 }
2038
2039 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2040 {
2041 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2042 common, common);
2043
2044 hbitmap_free(state->backup);
2045 }
2046
2047 static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
2048 Error **errp)
2049 {
2050 BlockDirtyBitmap *action;
2051 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2052 common, common);
2053
2054 if (action_check_completion_mode(common, errp) < 0) {
2055 return;
2056 }
2057
2058 action = common->action->u.x_block_dirty_bitmap_enable.data;
2059 state->bitmap = block_dirty_bitmap_lookup(action->node,
2060 action->name,
2061 NULL,
2062 errp);
2063 if (!state->bitmap) {
2064 return;
2065 }
2066
2067 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2068 bdrv_enable_dirty_bitmap(state->bitmap);
2069 }
2070
2071 static void block_dirty_bitmap_enable_abort(BlkActionState *common)
2072 {
2073 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2074 common, common);
2075
2076 if (!state->was_enabled) {
2077 bdrv_disable_dirty_bitmap(state->bitmap);
2078 }
2079 }
2080
2081 static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
2082 Error **errp)
2083 {
2084 BlockDirtyBitmap *action;
2085 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2086 common, common);
2087
2088 if (action_check_completion_mode(common, errp) < 0) {
2089 return;
2090 }
2091
2092 action = common->action->u.x_block_dirty_bitmap_disable.data;
2093 state->bitmap = block_dirty_bitmap_lookup(action->node,
2094 action->name,
2095 NULL,
2096 errp);
2097 if (!state->bitmap) {
2098 return;
2099 }
2100
2101 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2102 bdrv_disable_dirty_bitmap(state->bitmap);
2103 }
2104
2105 static void block_dirty_bitmap_disable_abort(BlkActionState *common)
2106 {
2107 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2108 common, common);
2109
2110 if (state->was_enabled) {
2111 bdrv_enable_dirty_bitmap(state->bitmap);
2112 }
2113 }
2114
2115 static void abort_prepare(BlkActionState *common, Error **errp)
2116 {
2117 error_setg(errp, "Transaction aborted using Abort action");
2118 }
2119
2120 static void abort_commit(BlkActionState *common)
2121 {
2122 g_assert_not_reached(); /* this action never succeeds */
2123 }
2124
2125 static const BlkActionOps actions[] = {
2126 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2127 .instance_size = sizeof(ExternalSnapshotState),
2128 .prepare = external_snapshot_prepare,
2129 .commit = external_snapshot_commit,
2130 .abort = external_snapshot_abort,
2131 .clean = external_snapshot_clean,
2132 },
2133 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2134 .instance_size = sizeof(ExternalSnapshotState),
2135 .prepare = external_snapshot_prepare,
2136 .commit = external_snapshot_commit,
2137 .abort = external_snapshot_abort,
2138 .clean = external_snapshot_clean,
2139 },
2140 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2141 .instance_size = sizeof(DriveBackupState),
2142 .prepare = drive_backup_prepare,
2143 .commit = drive_backup_commit,
2144 .abort = drive_backup_abort,
2145 .clean = drive_backup_clean,
2146 },
2147 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2148 .instance_size = sizeof(BlockdevBackupState),
2149 .prepare = blockdev_backup_prepare,
2150 .commit = blockdev_backup_commit,
2151 .abort = blockdev_backup_abort,
2152 .clean = blockdev_backup_clean,
2153 },
2154 [TRANSACTION_ACTION_KIND_ABORT] = {
2155 .instance_size = sizeof(BlkActionState),
2156 .prepare = abort_prepare,
2157 .commit = abort_commit,
2158 },
2159 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2160 .instance_size = sizeof(InternalSnapshotState),
2161 .prepare = internal_snapshot_prepare,
2162 .abort = internal_snapshot_abort,
2163 .clean = internal_snapshot_clean,
2164 },
2165 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2166 .instance_size = sizeof(BlockDirtyBitmapState),
2167 .prepare = block_dirty_bitmap_add_prepare,
2168 .abort = block_dirty_bitmap_add_abort,
2169 },
2170 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2171 .instance_size = sizeof(BlockDirtyBitmapState),
2172 .prepare = block_dirty_bitmap_clear_prepare,
2173 .commit = block_dirty_bitmap_clear_commit,
2174 .abort = block_dirty_bitmap_clear_abort,
2175 },
2176 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_ENABLE] = {
2177 .instance_size = sizeof(BlockDirtyBitmapState),
2178 .prepare = block_dirty_bitmap_enable_prepare,
2179 .abort = block_dirty_bitmap_enable_abort,
2180 },
2181 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_DISABLE] = {
2182 .instance_size = sizeof(BlockDirtyBitmapState),
2183 .prepare = block_dirty_bitmap_disable_prepare,
2184 .abort = block_dirty_bitmap_disable_abort,
2185 },
2186 /* Where are transactions for MIRROR, COMMIT and STREAM?
2187 * Although these blockjobs use transaction callbacks like the backup job,
2188 * these jobs do not necessarily adhere to transaction semantics.
2189 * These jobs may not fully undo all of their actions on abort, nor do they
2190 * necessarily work in transactions with more than one job in them.
2191 */
2192 };
2193
2194 /**
2195 * Allocate a TransactionProperties structure if necessary, and fill
2196 * that structure with desired defaults if they are unset.
2197 */
2198 static TransactionProperties *get_transaction_properties(
2199 TransactionProperties *props)
2200 {
2201 if (!props) {
2202 props = g_new0(TransactionProperties, 1);
2203 }
2204
2205 if (!props->has_completion_mode) {
2206 props->has_completion_mode = true;
2207 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2208 }
2209
2210 return props;
2211 }
2212
2213 /*
2214 * 'Atomic' group operations. The operations are performed as a set, and if
2215 * any fail then we roll back all operations in the group.
2216 */
2217 void qmp_transaction(TransactionActionList *dev_list,
2218 bool has_props,
2219 struct TransactionProperties *props,
2220 Error **errp)
2221 {
2222 TransactionActionList *dev_entry = dev_list;
2223 JobTxn *block_job_txn = NULL;
2224 BlkActionState *state, *next;
2225 Error *local_err = NULL;
2226
2227 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2228 QSIMPLEQ_INIT(&snap_bdrv_states);
2229
2230 /* Does this transaction get canceled as a group on failure?
2231 * If not, we don't really need to make a JobTxn.
2232 */
2233 props = get_transaction_properties(props);
2234 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2235 block_job_txn = job_txn_new();
2236 }
2237
2238 /* drain all i/o before any operations */
2239 bdrv_drain_all();
2240
2241 /* We don't do anything in this loop that commits us to the operations */
2242 while (NULL != dev_entry) {
2243 TransactionAction *dev_info = NULL;
2244 const BlkActionOps *ops;
2245
2246 dev_info = dev_entry->value;
2247 dev_entry = dev_entry->next;
2248
2249 assert(dev_info->type < ARRAY_SIZE(actions));
2250
2251 ops = &actions[dev_info->type];
2252 assert(ops->instance_size > 0);
2253
2254 state = g_malloc0(ops->instance_size);
2255 state->ops = ops;
2256 state->action = dev_info;
2257 state->block_job_txn = block_job_txn;
2258 state->txn_props = props;
2259 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2260
2261 state->ops->prepare(state, &local_err);
2262 if (local_err) {
2263 error_propagate(errp, local_err);
2264 goto delete_and_fail;
2265 }
2266 }
2267
2268 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2269 if (state->ops->commit) {
2270 state->ops->commit(state);
2271 }
2272 }
2273
2274 /* success */
2275 goto exit;
2276
2277 delete_and_fail:
2278 /* failure, and it is all-or-none; roll back all operations */
2279 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2280 if (state->ops->abort) {
2281 state->ops->abort(state);
2282 }
2283 }
2284 exit:
2285 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2286 if (state->ops->clean) {
2287 state->ops->clean(state);
2288 }
2289 g_free(state);
2290 }
2291 if (!has_props) {
2292 qapi_free_TransactionProperties(props);
2293 }
2294 job_txn_unref(block_job_txn);
2295 }
2296
2297 void qmp_eject(bool has_device, const char *device,
2298 bool has_id, const char *id,
2299 bool has_force, bool force, Error **errp)
2300 {
2301 Error *local_err = NULL;
2302 int rc;
2303
2304 if (!has_force) {
2305 force = false;
2306 }
2307
2308 rc = do_open_tray(has_device ? device : NULL,
2309 has_id ? id : NULL,
2310 force, &local_err);
2311 if (rc && rc != -ENOSYS) {
2312 error_propagate(errp, local_err);
2313 return;
2314 }
2315 error_free(local_err);
2316
2317 blockdev_remove_medium(has_device, device, has_id, id, errp);
2318 }
2319
2320 void qmp_block_passwd(bool has_device, const char *device,
2321 bool has_node_name, const char *node_name,
2322 const char *password, Error **errp)
2323 {
2324 error_setg(errp,
2325 "Setting block passwords directly is no longer supported");
2326 }
2327
2328 /*
2329 * Attempt to open the tray of @device.
2330 * If @force, ignore its tray lock.
2331 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2332 * On error, store an error through @errp and return -errno.
2333 * If @device does not exist, return -ENODEV.
2334 * If it has no removable media, return -ENOTSUP.
2335 * If it has no tray, return -ENOSYS.
2336 * If the guest was asked to open the tray, return -EINPROGRESS.
2337 * Else, return 0.
2338 */
2339 static int do_open_tray(const char *blk_name, const char *qdev_id,
2340 bool force, Error **errp)
2341 {
2342 BlockBackend *blk;
2343 const char *device = qdev_id ?: blk_name;
2344 bool locked;
2345
2346 blk = qmp_get_blk(blk_name, qdev_id, errp);
2347 if (!blk) {
2348 return -ENODEV;
2349 }
2350
2351 if (!blk_dev_has_removable_media(blk)) {
2352 error_setg(errp, "Device '%s' is not removable", device);
2353 return -ENOTSUP;
2354 }
2355
2356 if (!blk_dev_has_tray(blk)) {
2357 error_setg(errp, "Device '%s' does not have a tray", device);
2358 return -ENOSYS;
2359 }
2360
2361 if (blk_dev_is_tray_open(blk)) {
2362 return 0;
2363 }
2364
2365 locked = blk_dev_is_medium_locked(blk);
2366 if (locked) {
2367 blk_dev_eject_request(blk, force);
2368 }
2369
2370 if (!locked || force) {
2371 blk_dev_change_media_cb(blk, false, &error_abort);
2372 }
2373
2374 if (locked && !force) {
2375 error_setg(errp, "Device '%s' is locked and force was not specified, "
2376 "wait for tray to open and try again", device);
2377 return -EINPROGRESS;
2378 }
2379
2380 return 0;
2381 }
2382
2383 void qmp_blockdev_open_tray(bool has_device, const char *device,
2384 bool has_id, const char *id,
2385 bool has_force, bool force,
2386 Error **errp)
2387 {
2388 Error *local_err = NULL;
2389 int rc;
2390
2391 if (!has_force) {
2392 force = false;
2393 }
2394 rc = do_open_tray(has_device ? device : NULL,
2395 has_id ? id : NULL,
2396 force, &local_err);
2397 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
2398 error_propagate(errp, local_err);
2399 return;
2400 }
2401 error_free(local_err);
2402 }
2403
2404 void qmp_blockdev_close_tray(bool has_device, const char *device,
2405 bool has_id, const char *id,
2406 Error **errp)
2407 {
2408 BlockBackend *blk;
2409 Error *local_err = NULL;
2410
2411 device = has_device ? device : NULL;
2412 id = has_id ? id : NULL;
2413
2414 blk = qmp_get_blk(device, id, errp);
2415 if (!blk) {
2416 return;
2417 }
2418
2419 if (!blk_dev_has_removable_media(blk)) {
2420 error_setg(errp, "Device '%s' is not removable", device ?: id);
2421 return;
2422 }
2423
2424 if (!blk_dev_has_tray(blk)) {
2425 /* Ignore this command on tray-less devices */
2426 return;
2427 }
2428
2429 if (!blk_dev_is_tray_open(blk)) {
2430 return;
2431 }
2432
2433 blk_dev_change_media_cb(blk, true, &local_err);
2434 if (local_err) {
2435 error_propagate(errp, local_err);
2436 return;
2437 }
2438 }
2439
2440 static void blockdev_remove_medium(bool has_device, const char *device,
2441 bool has_id, const char *id, Error **errp)
2442 {
2443 BlockBackend *blk;
2444 BlockDriverState *bs;
2445 AioContext *aio_context;
2446 bool has_attached_device;
2447
2448 device = has_device ? device : NULL;
2449 id = has_id ? id : NULL;
2450
2451 blk = qmp_get_blk(device, id, errp);
2452 if (!blk) {
2453 return;
2454 }
2455
2456 /* For BBs without a device, we can exchange the BDS tree at will */
2457 has_attached_device = blk_get_attached_dev(blk);
2458
2459 if (has_attached_device && !blk_dev_has_removable_media(blk)) {
2460 error_setg(errp, "Device '%s' is not removable", device ?: id);
2461 return;
2462 }
2463
2464 if (has_attached_device && blk_dev_has_tray(blk) &&
2465 !blk_dev_is_tray_open(blk))
2466 {
2467 error_setg(errp, "Tray of device '%s' is not open", device ?: id);
2468 return;
2469 }
2470
2471 bs = blk_bs(blk);
2472 if (!bs) {
2473 return;
2474 }
2475
2476 aio_context = bdrv_get_aio_context(bs);
2477 aio_context_acquire(aio_context);
2478
2479 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2480 goto out;
2481 }
2482
2483 blk_remove_bs(blk);
2484
2485 if (!blk_dev_has_tray(blk)) {
2486 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2487 * called at all); therefore, the medium needs to be ejected here.
2488 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2489 * value passed here (i.e. false). */
2490 blk_dev_change_media_cb(blk, false, &error_abort);
2491 }
2492
2493 out:
2494 aio_context_release(aio_context);
2495 }
2496
2497 void qmp_blockdev_remove_medium(const char *id, Error **errp)
2498 {
2499 blockdev_remove_medium(false, NULL, true, id, errp);
2500 }
2501
2502 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2503 BlockDriverState *bs, Error **errp)
2504 {
2505 Error *local_err = NULL;
2506 bool has_device;
2507 int ret;
2508
2509 /* For BBs without a device, we can exchange the BDS tree at will */
2510 has_device = blk_get_attached_dev(blk);
2511
2512 if (has_device && !blk_dev_has_removable_media(blk)) {
2513 error_setg(errp, "Device is not removable");
2514 return;
2515 }
2516
2517 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2518 error_setg(errp, "Tray of the device is not open");
2519 return;
2520 }
2521
2522 if (blk_bs(blk)) {
2523 error_setg(errp, "There already is a medium in the device");
2524 return;
2525 }
2526
2527 ret = blk_insert_bs(blk, bs, errp);
2528 if (ret < 0) {
2529 return;
2530 }
2531
2532 if (!blk_dev_has_tray(blk)) {
2533 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2534 * called at all); therefore, the medium needs to be pushed into the
2535 * slot here.
2536 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2537 * value passed here (i.e. true). */
2538 blk_dev_change_media_cb(blk, true, &local_err);
2539 if (local_err) {
2540 error_propagate(errp, local_err);
2541 blk_remove_bs(blk);
2542 return;
2543 }
2544 }
2545 }
2546
2547 static void blockdev_insert_medium(bool has_device, const char *device,
2548 bool has_id, const char *id,
2549 const char *node_name, Error **errp)
2550 {
2551 BlockBackend *blk;
2552 BlockDriverState *bs;
2553
2554 blk = qmp_get_blk(has_device ? device : NULL,
2555 has_id ? id : NULL,
2556 errp);
2557 if (!blk) {
2558 return;
2559 }
2560
2561 bs = bdrv_find_node(node_name);
2562 if (!bs) {
2563 error_setg(errp, "Node '%s' not found", node_name);
2564 return;
2565 }
2566
2567 if (bdrv_has_blk(bs)) {
2568 error_setg(errp, "Node '%s' is already in use", node_name);
2569 return;
2570 }
2571
2572 qmp_blockdev_insert_anon_medium(blk, bs, errp);
2573 }
2574
2575 void qmp_blockdev_insert_medium(const char *id, const char *node_name,
2576 Error **errp)
2577 {
2578 blockdev_insert_medium(false, NULL, true, id, node_name, errp);
2579 }
2580
2581 void qmp_blockdev_change_medium(bool has_device, const char *device,
2582 bool has_id, const char *id,
2583 const char *filename,
2584 bool has_format, const char *format,
2585 bool has_read_only,
2586 BlockdevChangeReadOnlyMode read_only,
2587 Error **errp)
2588 {
2589 BlockBackend *blk;
2590 BlockDriverState *medium_bs = NULL;
2591 int bdrv_flags;
2592 bool detect_zeroes;
2593 int rc;
2594 QDict *options = NULL;
2595 Error *err = NULL;
2596
2597 blk = qmp_get_blk(has_device ? device : NULL,
2598 has_id ? id : NULL,
2599 errp);
2600 if (!blk) {
2601 goto fail;
2602 }
2603
2604 if (blk_bs(blk)) {
2605 blk_update_root_state(blk);
2606 }
2607
2608 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2609 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2610 BDRV_O_PROTOCOL);
2611
2612 if (!has_read_only) {
2613 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2614 }
2615
2616 switch (read_only) {
2617 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2618 break;
2619
2620 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2621 bdrv_flags &= ~BDRV_O_RDWR;
2622 break;
2623
2624 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2625 bdrv_flags |= BDRV_O_RDWR;
2626 break;
2627
2628 default:
2629 abort();
2630 }
2631
2632 options = qdict_new();
2633 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2634 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
2635
2636 if (has_format) {
2637 qdict_put_str(options, "driver", format);
2638 }
2639
2640 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
2641 if (!medium_bs) {
2642 goto fail;
2643 }
2644
2645 rc = do_open_tray(has_device ? device : NULL,
2646 has_id ? id : NULL,
2647 false, &err);
2648 if (rc && rc != -ENOSYS) {
2649 error_propagate(errp, err);
2650 goto fail;
2651 }
2652 error_free(err);
2653 err = NULL;
2654
2655 blockdev_remove_medium(has_device, device, has_id, id, &err);
2656 if (err) {
2657 error_propagate(errp, err);
2658 goto fail;
2659 }
2660
2661 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2662 if (err) {
2663 error_propagate(errp, err);
2664 goto fail;
2665 }
2666
2667 qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2668
2669 fail:
2670 /* If the medium has been inserted, the device has its own reference, so
2671 * ours must be relinquished; and if it has not been inserted successfully,
2672 * the reference must be relinquished anyway */
2673 bdrv_unref(medium_bs);
2674 }
2675
2676 /* throttling disk I/O limits */
2677 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2678 {
2679 ThrottleConfig cfg;
2680 BlockDriverState *bs;
2681 BlockBackend *blk;
2682 AioContext *aio_context;
2683
2684 blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
2685 arg->has_id ? arg->id : NULL,
2686 errp);
2687 if (!blk) {
2688 return;
2689 }
2690
2691 aio_context = blk_get_aio_context(blk);
2692 aio_context_acquire(aio_context);
2693
2694 bs = blk_bs(blk);
2695 if (!bs) {
2696 error_setg(errp, "Device has no medium");
2697 goto out;
2698 }
2699
2700 throttle_config_init(&cfg);
2701 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
2702 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd;
2703 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
2704
2705 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
2706 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd;
2707 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
2708
2709 if (arg->has_bps_max) {
2710 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2711 }
2712 if (arg->has_bps_rd_max) {
2713 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2714 }
2715 if (arg->has_bps_wr_max) {
2716 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2717 }
2718 if (arg->has_iops_max) {
2719 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2720 }
2721 if (arg->has_iops_rd_max) {
2722 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2723 }
2724 if (arg->has_iops_wr_max) {
2725 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2726 }
2727
2728 if (arg->has_bps_max_length) {
2729 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2730 }
2731 if (arg->has_bps_rd_max_length) {
2732 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2733 }
2734 if (arg->has_bps_wr_max_length) {
2735 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2736 }
2737 if (arg->has_iops_max_length) {
2738 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2739 }
2740 if (arg->has_iops_rd_max_length) {
2741 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2742 }
2743 if (arg->has_iops_wr_max_length) {
2744 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2745 }
2746
2747 if (arg->has_iops_size) {
2748 cfg.op_size = arg->iops_size;
2749 }
2750
2751 if (!throttle_is_valid(&cfg, errp)) {
2752 goto out;
2753 }
2754
2755 if (throttle_enabled(&cfg)) {
2756 /* Enable I/O limits if they're not enabled yet, otherwise
2757 * just update the throttling group. */
2758 if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
2759 blk_io_limits_enable(blk,
2760 arg->has_group ? arg->group :
2761 arg->has_device ? arg->device :
2762 arg->id);
2763 } else if (arg->has_group) {
2764 blk_io_limits_update_group(blk, arg->group);
2765 }
2766 /* Set the new throttling configuration */
2767 blk_set_io_limits(blk, &cfg);
2768 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
2769 /* If all throttling settings are set to 0, disable I/O limits */
2770 blk_io_limits_disable(blk);
2771 }
2772
2773 out:
2774 aio_context_release(aio_context);
2775 }
2776
2777 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2778 bool has_granularity, uint32_t granularity,
2779 bool has_persistent, bool persistent,
2780 bool has_autoload, bool autoload,
2781 bool has_disabled, bool disabled,
2782 Error **errp)
2783 {
2784 BlockDriverState *bs;
2785 BdrvDirtyBitmap *bitmap;
2786
2787 if (!name || name[0] == '\0') {
2788 error_setg(errp, "Bitmap name cannot be empty");
2789 return;
2790 }
2791
2792 bs = bdrv_lookup_bs(node, node, errp);
2793 if (!bs) {
2794 return;
2795 }
2796
2797 if (has_granularity) {
2798 if (granularity < 512 || !is_power_of_2(granularity)) {
2799 error_setg(errp, "Granularity must be power of 2 "
2800 "and at least 512");
2801 return;
2802 }
2803 } else {
2804 /* Default to cluster size, if available: */
2805 granularity = bdrv_get_default_bitmap_granularity(bs);
2806 }
2807
2808 if (!has_persistent) {
2809 persistent = false;
2810 }
2811
2812 if (has_autoload) {
2813 warn_report("Autoload option is deprecated and its value is ignored");
2814 }
2815
2816 if (!has_disabled) {
2817 disabled = false;
2818 }
2819
2820 if (persistent &&
2821 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
2822 {
2823 return;
2824 }
2825
2826 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2827 if (bitmap == NULL) {
2828 return;
2829 }
2830
2831 if (disabled) {
2832 bdrv_disable_dirty_bitmap(bitmap);
2833 }
2834
2835 bdrv_dirty_bitmap_set_persistance(bitmap, persistent);
2836 }
2837
2838 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2839 Error **errp)
2840 {
2841 BlockDriverState *bs;
2842 BdrvDirtyBitmap *bitmap;
2843 Error *local_err = NULL;
2844
2845 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2846 if (!bitmap || !bs) {
2847 return;
2848 }
2849
2850 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2851 error_setg(errp,
2852 "Bitmap '%s' is currently frozen and cannot be removed",
2853 name);
2854 return;
2855 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
2856 error_setg(errp,
2857 "Bitmap '%s' is currently locked and cannot be removed",
2858 name);
2859 return;
2860 }
2861
2862 if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
2863 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
2864 if (local_err != NULL) {
2865 error_propagate(errp, local_err);
2866 return;
2867 }
2868 }
2869
2870 bdrv_release_dirty_bitmap(bs, bitmap);
2871 }
2872
2873 /**
2874 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2875 * immediately after a full backup operation.
2876 */
2877 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2878 Error **errp)
2879 {
2880 BdrvDirtyBitmap *bitmap;
2881 BlockDriverState *bs;
2882
2883 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2884 if (!bitmap || !bs) {
2885 return;
2886 }
2887
2888 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2889 error_setg(errp,
2890 "Bitmap '%s' is currently frozen and cannot be modified",
2891 name);
2892 return;
2893 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
2894 error_setg(errp,
2895 "Bitmap '%s' is currently locked and cannot be modified",
2896 name);
2897 return;
2898 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2899 error_setg(errp,
2900 "Bitmap '%s' is currently disabled and cannot be cleared",
2901 name);
2902 return;
2903 } else if (bdrv_dirty_bitmap_readonly(bitmap)) {
2904 error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name);
2905 return;
2906 }
2907
2908 bdrv_clear_dirty_bitmap(bitmap, NULL);
2909 }
2910
2911 void qmp_x_block_dirty_bitmap_enable(const char *node, const char *name,
2912 Error **errp)
2913 {
2914 BlockDriverState *bs;
2915 BdrvDirtyBitmap *bitmap;
2916
2917 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2918 if (!bitmap) {
2919 return;
2920 }
2921
2922 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2923 error_setg(errp,
2924 "Bitmap '%s' is currently frozen and cannot be enabled",
2925 name);
2926 return;
2927 }
2928
2929 bdrv_enable_dirty_bitmap(bitmap);
2930 }
2931
2932 void qmp_x_block_dirty_bitmap_disable(const char *node, const char *name,
2933 Error **errp)
2934 {
2935 BlockDriverState *bs;
2936 BdrvDirtyBitmap *bitmap;
2937
2938 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2939 if (!bitmap) {
2940 return;
2941 }
2942
2943 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2944 error_setg(errp,
2945 "Bitmap '%s' is currently frozen and cannot be disabled",
2946 name);
2947 return;
2948 }
2949
2950 bdrv_disable_dirty_bitmap(bitmap);
2951 }
2952
2953 void qmp_x_block_dirty_bitmap_merge(const char *node, const char *dst_name,
2954 const char *src_name, Error **errp)
2955 {
2956 BlockDriverState *bs;
2957 BdrvDirtyBitmap *dst, *src;
2958
2959 dst = block_dirty_bitmap_lookup(node, dst_name, &bs, errp);
2960 if (!dst) {
2961 return;
2962 }
2963
2964 if (bdrv_dirty_bitmap_frozen(dst)) {
2965 error_setg(errp, "Bitmap '%s' is frozen and cannot be modified",
2966 dst_name);
2967 return;
2968 } else if (bdrv_dirty_bitmap_readonly(dst)) {
2969 error_setg(errp, "Bitmap '%s' is readonly and cannot be modified",
2970 dst_name);
2971 return;
2972 }
2973
2974 src = bdrv_find_dirty_bitmap(bs, src_name);
2975 if (!src) {
2976 error_setg(errp, "Dirty bitmap '%s' not found", src_name);
2977 return;
2978 }
2979
2980 bdrv_merge_dirty_bitmap(dst, src, errp);
2981 }
2982
2983 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2984 const char *name,
2985 Error **errp)
2986 {
2987 BdrvDirtyBitmap *bitmap;
2988 BlockDriverState *bs;
2989 BlockDirtyBitmapSha256 *ret = NULL;
2990 char *sha256;
2991
2992 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2993 if (!bitmap || !bs) {
2994 return NULL;
2995 }
2996
2997 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2998 if (sha256 == NULL) {
2999 return NULL;
3000 }
3001
3002 ret = g_new(BlockDirtyBitmapSha256, 1);
3003 ret->sha256 = sha256;
3004
3005 return ret;
3006 }
3007
3008 void hmp_drive_del(Monitor *mon, const QDict *qdict)
3009 {
3010 const char *id = qdict_get_str(qdict, "id");
3011 BlockBackend *blk;
3012 BlockDriverState *bs;
3013 AioContext *aio_context;
3014 Error *local_err = NULL;
3015
3016 bs = bdrv_find_node(id);
3017 if (bs) {
3018 qmp_blockdev_del(id, &local_err);
3019 if (local_err) {
3020 error_report_err(local_err);
3021 }
3022 return;
3023 }
3024
3025 blk = blk_by_name(id);
3026 if (!blk) {
3027 error_report("Device '%s' not found", id);
3028 return;
3029 }
3030
3031 if (!blk_legacy_dinfo(blk)) {
3032 error_report("Deleting device added with blockdev-add"
3033 " is not supported");
3034 return;
3035 }
3036
3037 aio_context = blk_get_aio_context(blk);
3038 aio_context_acquire(aio_context);
3039
3040 bs = blk_bs(blk);
3041 if (bs) {
3042 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
3043 error_report_err(local_err);
3044 aio_context_release(aio_context);
3045 return;
3046 }
3047
3048 blk_remove_bs(blk);
3049 }
3050
3051 /* Make the BlockBackend and the attached BlockDriverState anonymous */
3052 monitor_remove_blk(blk);
3053
3054 /* If this BlockBackend has a device attached to it, its refcount will be
3055 * decremented when the device is removed; otherwise we have to do so here.
3056 */
3057 if (blk_get_attached_dev(blk)) {
3058 /* Further I/O must not pause the guest */
3059 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
3060 BLOCKDEV_ON_ERROR_REPORT);
3061 } else {
3062 blk_unref(blk);
3063 }
3064
3065 aio_context_release(aio_context);
3066 }
3067
3068 void qmp_block_resize(bool has_device, const char *device,
3069 bool has_node_name, const char *node_name,
3070 int64_t size, Error **errp)
3071 {
3072 Error *local_err = NULL;
3073 BlockBackend *blk = NULL;
3074 BlockDriverState *bs;
3075 AioContext *aio_context;
3076 int ret;
3077
3078 bs = bdrv_lookup_bs(has_device ? device : NULL,
3079 has_node_name ? node_name : NULL,
3080 &local_err);
3081 if (local_err) {
3082 error_propagate(errp, local_err);
3083 return;
3084 }
3085
3086 aio_context = bdrv_get_aio_context(bs);
3087 aio_context_acquire(aio_context);
3088
3089 if (!bdrv_is_first_non_filter(bs)) {
3090 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
3091 goto out;
3092 }
3093
3094 if (size < 0) {
3095 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
3096 goto out;
3097 }
3098
3099 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
3100 error_setg(errp, QERR_DEVICE_IN_USE, device);
3101 goto out;
3102 }
3103
3104 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
3105 ret = blk_insert_bs(blk, bs, errp);
3106 if (ret < 0) {
3107 goto out;
3108 }
3109
3110 bdrv_drained_begin(bs);
3111 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
3112 bdrv_drained_end(bs);
3113
3114 out:
3115 blk_unref(blk);
3116 aio_context_release(aio_context);
3117 }
3118
3119 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
3120 bool has_base, const char *base,
3121 bool has_base_node, const char *base_node,
3122 bool has_backing_file, const char *backing_file,
3123 bool has_speed, int64_t speed,
3124 bool has_on_error, BlockdevOnError on_error,
3125 bool has_auto_finalize, bool auto_finalize,
3126 bool has_auto_dismiss, bool auto_dismiss,
3127 Error **errp)
3128 {
3129 BlockDriverState *bs, *iter;
3130 BlockDriverState *base_bs = NULL;
3131 AioContext *aio_context;
3132 Error *local_err = NULL;
3133 const char *base_name = NULL;
3134 int job_flags = JOB_DEFAULT;
3135
3136 if (!has_on_error) {
3137 on_error = BLOCKDEV_ON_ERROR_REPORT;
3138 }
3139
3140 bs = bdrv_lookup_bs(device, device, errp);
3141 if (!bs) {
3142 return;
3143 }
3144
3145 aio_context = bdrv_get_aio_context(bs);
3146 aio_context_acquire(aio_context);
3147
3148 if (has_base && has_base_node) {
3149 error_setg(errp, "'base' and 'base-node' cannot be specified "
3150 "at the same time");
3151 goto out;
3152 }
3153
3154 if (has_base) {
3155 base_bs = bdrv_find_backing_image(bs, base);
3156 if (base_bs == NULL) {
3157 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3158 goto out;
3159 }
3160 assert(bdrv_get_aio_context(base_bs) == aio_context);
3161 base_name = base;
3162 }
3163
3164 if (has_base_node) {
3165 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3166 if (!base_bs) {
3167 goto out;
3168 }
3169 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
3170 error_setg(errp, "Node '%s' is not a backing image of '%s'",
3171 base_node, device);
3172 goto out;
3173 }
3174 assert(bdrv_get_aio_context(base_bs) == aio_context);
3175 base_name = base_bs->filename;
3176 }
3177
3178 /* Check for op blockers in the whole chain between bs and base */
3179 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
3180 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
3181 goto out;
3182 }
3183 }
3184
3185 /* if we are streaming the entire chain, the result will have no backing
3186 * file, and specifying one is therefore an error */
3187 if (base_bs == NULL && has_backing_file) {
3188 error_setg(errp, "backing file specified, but streaming the "
3189 "entire chain");
3190 goto out;
3191 }
3192
3193 /* backing_file string overrides base bs filename */
3194 base_name = has_backing_file ? backing_file : base_name;
3195
3196 if (has_auto_finalize && !auto_finalize) {
3197 job_flags |= JOB_MANUAL_FINALIZE;
3198 }
3199 if (has_auto_dismiss && !auto_dismiss) {
3200 job_flags |= JOB_MANUAL_DISMISS;
3201 }
3202
3203 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
3204 job_flags, has_speed ? speed : 0, on_error, &local_err);
3205 if (local_err) {
3206 error_propagate(errp, local_err);
3207 goto out;
3208 }
3209
3210 trace_qmp_block_stream(bs, bs->job);
3211
3212 out:
3213 aio_context_release(aio_context);
3214 }
3215
3216 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3217 bool has_base_node, const char *base_node,
3218 bool has_base, const char *base,
3219 bool has_top_node, const char *top_node,
3220 bool has_top, const char *top,
3221 bool has_backing_file, const char *backing_file,
3222 bool has_speed, int64_t speed,
3223 bool has_filter_node_name, const char *filter_node_name,
3224 bool has_auto_finalize, bool auto_finalize,
3225 bool has_auto_dismiss, bool auto_dismiss,
3226 Error **errp)
3227 {
3228 BlockDriverState *bs;
3229 BlockDriverState *iter;
3230 BlockDriverState *base_bs, *top_bs;
3231 AioContext *aio_context;
3232 Error *local_err = NULL;
3233 /* This will be part of the QMP command, if/when the
3234 * BlockdevOnError change for blkmirror makes it in
3235 */
3236 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3237 int job_flags = JOB_DEFAULT;
3238
3239 if (!has_speed) {
3240 speed = 0;
3241 }
3242 if (!has_filter_node_name) {
3243 filter_node_name = NULL;
3244 }
3245 if (has_auto_finalize && !auto_finalize) {
3246 job_flags |= JOB_MANUAL_FINALIZE;
3247 }
3248 if (has_auto_dismiss && !auto_dismiss) {
3249 job_flags |= JOB_MANUAL_DISMISS;
3250 }
3251
3252 /* Important Note:
3253 * libvirt relies on the DeviceNotFound error class in order to probe for
3254 * live commit feature versions; for this to work, we must make sure to
3255 * perform the device lookup before any generic errors that may occur in a
3256 * scenario in which all optional arguments are omitted. */
3257 bs = qmp_get_root_bs(device, &local_err);
3258 if (!bs) {
3259 bs = bdrv_lookup_bs(device, device, NULL);
3260 if (!bs) {
3261 error_free(local_err);
3262 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3263 "Device '%s' not found", device);
3264 } else {
3265 error_propagate(errp, local_err);
3266 }
3267 return;
3268 }
3269
3270 aio_context = bdrv_get_aio_context(bs);
3271 aio_context_acquire(aio_context);
3272
3273 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3274 goto out;
3275 }
3276
3277 /* default top_bs is the active layer */
3278 top_bs = bs;
3279
3280 if (has_top_node && has_top) {
3281 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
3282 goto out;
3283 } else if (has_top_node) {
3284 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
3285 if (top_bs == NULL) {
3286 goto out;
3287 }
3288 if (!bdrv_chain_contains(bs, top_bs)) {
3289 error_setg(errp, "'%s' is not in this backing file chain",
3290 top_node);
3291 goto out;
3292 }
3293 } else if (has_top && top) {
3294 if (strcmp(bs->filename, top) != 0) {
3295 top_bs = bdrv_find_backing_image(bs, top);
3296 }
3297 }
3298
3299 if (top_bs == NULL) {
3300 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3301 goto out;
3302 }
3303
3304 assert(bdrv_get_aio_context(top_bs) == aio_context);
3305
3306 if (has_base_node && has_base) {
3307 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
3308 goto out;
3309 } else if (has_base_node) {
3310 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3311 if (base_bs == NULL) {
3312 goto out;
3313 }
3314 if (!bdrv_chain_contains(top_bs, base_bs)) {
3315 error_setg(errp, "'%s' is not in this backing file chain",
3316 base_node);
3317 goto out;
3318 }
3319 } else if (has_base && base) {
3320 base_bs = bdrv_find_backing_image(top_bs, base);
3321 } else {
3322 base_bs = bdrv_find_base(top_bs);
3323 }
3324
3325 if (base_bs == NULL) {
3326 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3327 goto out;
3328 }
3329
3330 assert(bdrv_get_aio_context(base_bs) == aio_context);
3331
3332 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
3333 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3334 goto out;
3335 }
3336 }
3337
3338 /* Do not allow attempts to commit an image into itself */
3339 if (top_bs == base_bs) {
3340 error_setg(errp, "cannot commit an image into itself");
3341 goto out;
3342 }
3343
3344 if (top_bs == bs) {
3345 if (has_backing_file) {
3346 error_setg(errp, "'backing-file' specified,"
3347 " but 'top' is the active layer");
3348 goto out;
3349 }
3350 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3351 job_flags, speed, on_error,
3352 filter_node_name, NULL, NULL, false, &local_err);
3353 } else {
3354 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
3355 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3356 goto out;
3357 }
3358 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags,
3359 speed, on_error, has_backing_file ? backing_file : NULL,
3360 filter_node_name, &local_err);
3361 }
3362 if (local_err != NULL) {
3363 error_propagate(errp, local_err);
3364 goto out;
3365 }
3366
3367 out:
3368 aio_context_release(aio_context);
3369 }
3370
3371 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
3372 Error **errp)
3373 {
3374 BlockDriverState *bs;
3375 BlockDriverState *target_bs;
3376 BlockDriverState *source = NULL;
3377 BlockJob *job = NULL;
3378 BdrvDirtyBitmap *bmap = NULL;
3379 AioContext *aio_context;
3380 QDict *options = NULL;
3381 Error *local_err = NULL;
3382 int flags, job_flags = JOB_DEFAULT;
3383 int64_t size;
3384 bool set_backing_hd = false;
3385
3386 if (!backup->has_speed) {
3387 backup->speed = 0;
3388 }
3389 if (!backup->has_on_source_error) {
3390 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3391 }
3392 if (!backup->has_on_target_error) {
3393 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3394 }
3395 if (!backup->has_mode) {
3396 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3397 }
3398 if (!backup->has_job_id) {
3399 backup->job_id = NULL;
3400 }
3401 if (!backup->has_auto_finalize) {
3402 backup->auto_finalize = true;
3403 }
3404 if (!backup->has_auto_dismiss) {
3405 backup->auto_dismiss = true;
3406 }
3407 if (!backup->has_compress) {
3408 backup->compress = false;
3409 }
3410
3411 bs = qmp_get_root_bs(backup->device, errp);
3412 if (!bs) {
3413 return NULL;
3414 }
3415
3416 aio_context = bdrv_get_aio_context(bs);
3417 aio_context_acquire(aio_context);
3418
3419 if (!backup->has_format) {
3420 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
3421 NULL : (char*) bs->drv->format_name;
3422 }
3423
3424 /* Early check to avoid creating target */
3425 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3426 goto out;
3427 }
3428
3429 flags = bs->open_flags | BDRV_O_RDWR;
3430
3431 /* See if we have a backing HD we can use to create our new image
3432 * on top of. */
3433 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3434 source = backing_bs(bs);
3435 if (!source) {
3436 backup->sync = MIRROR_SYNC_MODE_FULL;
3437 }
3438 }
3439 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3440 source = bs;
3441 flags |= BDRV_O_NO_BACKING;
3442 set_backing_hd = true;
3443 }
3444
3445 size = bdrv_getlength(bs);
3446 if (size < 0) {
3447 error_setg_errno(errp, -size, "bdrv_getlength failed");
3448 goto out;
3449 }
3450
3451 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
3452 assert(backup->format);
3453 if (source) {
3454 bdrv_img_create(backup->target, backup->format, source->filename,
3455 source->drv->format_name, NULL,
3456 size, flags, false, &local_err);
3457 } else {
3458 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
3459 size, flags, false, &local_err);
3460 }
3461 }
3462
3463 if (local_err) {
3464 error_propagate(errp, local_err);
3465 goto out;
3466 }
3467
3468 if (backup->format) {
3469 if (!options) {
3470 options = qdict_new();
3471 }
3472 qdict_put_str(options, "driver", backup->format);
3473 }
3474
3475 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
3476 if (!target_bs) {
3477 goto out;
3478 }
3479
3480 bdrv_set_aio_context(target_bs, aio_context);
3481
3482 if (set_backing_hd) {
3483 bdrv_set_backing_hd(target_bs, source, &local_err);
3484 if (local_err) {
3485 bdrv_unref(target_bs);
3486 goto out;
3487 }
3488 }
3489
3490 if (backup->has_bitmap) {
3491 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3492 if (!bmap) {
3493 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3494 bdrv_unref(target_bs);
3495 goto out;
3496 }
3497 if (bdrv_dirty_bitmap_qmp_locked(bmap)) {
3498 error_setg(errp,
3499 "Bitmap '%s' is currently locked and cannot be used for "
3500 "backup", backup->bitmap);
3501 goto out;
3502 }
3503 }
3504 if (!backup->auto_finalize) {
3505 job_flags |= JOB_MANUAL_FINALIZE;
3506 }
3507 if (!backup->auto_dismiss) {
3508 job_flags |= JOB_MANUAL_DISMISS;
3509 }
3510
3511 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3512 backup->sync, bmap, backup->compress,
3513 backup->on_source_error, backup->on_target_error,
3514 job_flags, NULL, NULL, txn, &local_err);
3515 bdrv_unref(target_bs);
3516 if (local_err != NULL) {
3517 error_propagate(errp, local_err);
3518 goto out;
3519 }
3520
3521 out:
3522 aio_context_release(aio_context);
3523 return job;
3524 }
3525
3526 void qmp_drive_backup(DriveBackup *arg, Error **errp)
3527 {
3528
3529 BlockJob *job;
3530 job = do_drive_backup(arg, NULL, errp);
3531 if (job) {
3532 job_start(&job->job);
3533 }
3534 }
3535
3536 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3537 {
3538 return bdrv_named_nodes_list(errp);
3539 }
3540
3541 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
3542 Error **errp)
3543 {
3544 BlockDriverState *bs;
3545 BlockDriverState *target_bs;
3546 Error *local_err = NULL;
3547 AioContext *aio_context;
3548 BlockJob *job = NULL;
3549 int job_flags = JOB_DEFAULT;
3550
3551 if (!backup->has_speed) {
3552 backup->speed = 0;
3553 }
3554 if (!backup->has_on_source_error) {
3555 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3556 }
3557 if (!backup->has_on_target_error) {
3558 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3559 }
3560 if (!backup->has_job_id) {
3561 backup->job_id = NULL;
3562 }
3563 if (!backup->has_auto_finalize) {
3564 backup->auto_finalize = true;
3565 }
3566 if (!backup->has_auto_dismiss) {
3567 backup->auto_dismiss = true;
3568 }
3569 if (!backup->has_compress) {
3570 backup->compress = false;
3571 }
3572
3573 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
3574 if (!bs) {
3575 return NULL;
3576 }
3577
3578 aio_context = bdrv_get_aio_context(bs);
3579 aio_context_acquire(aio_context);
3580
3581 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
3582 if (!target_bs) {
3583 goto out;
3584 }
3585
3586 if (bdrv_get_aio_context(target_bs) != aio_context) {
3587 if (!bdrv_has_blk(target_bs)) {
3588 /* The target BDS is not attached, we can safely move it to another
3589 * AioContext. */
3590 bdrv_set_aio_context(target_bs, aio_context);
3591 } else {
3592 error_setg(errp, "Target is attached to a different thread from "
3593 "source.");
3594 goto out;
3595 }
3596 }
3597 if (!backup->auto_finalize) {
3598 job_flags |= JOB_MANUAL_FINALIZE;
3599 }
3600 if (!backup->auto_dismiss) {
3601 job_flags |= JOB_MANUAL_DISMISS;
3602 }
3603 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3604 backup->sync, NULL, backup->compress,
3605 backup->on_source_error, backup->on_target_error,
3606 job_flags, NULL, NULL, txn, &local_err);
3607 if (local_err != NULL) {
3608 error_propagate(errp, local_err);
3609 }
3610 out:
3611 aio_context_release(aio_context);
3612 return job;
3613 }
3614
3615 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
3616 {
3617 BlockJob *job;
3618 job = do_blockdev_backup(arg, NULL, errp);
3619 if (job) {
3620 job_start(&job->job);
3621 }
3622 }
3623
3624 /* Parameter check and block job starting for drive mirroring.
3625 * Caller should hold @device and @target's aio context (must be the same).
3626 **/
3627 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3628 BlockDriverState *target,
3629 bool has_replaces, const char *replaces,
3630 enum MirrorSyncMode sync,
3631 BlockMirrorBackingMode backing_mode,
3632 bool has_speed, int64_t speed,
3633 bool has_granularity, uint32_t granularity,
3634 bool has_buf_size, int64_t buf_size,
3635 bool has_on_source_error,
3636 BlockdevOnError on_source_error,
3637 bool has_on_target_error,
3638 BlockdevOnError on_target_error,
3639 bool has_unmap, bool unmap,
3640 bool has_filter_node_name,
3641 const char *filter_node_name,
3642 bool has_copy_mode, MirrorCopyMode copy_mode,
3643 bool has_auto_finalize, bool auto_finalize,
3644 bool has_auto_dismiss, bool auto_dismiss,
3645 Error **errp)
3646 {
3647 int job_flags = JOB_DEFAULT;
3648
3649 if (!has_speed) {
3650 speed = 0;
3651 }
3652 if (!has_on_source_error) {
3653 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3654 }
3655 if (!has_on_target_error) {
3656 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3657 }
3658 if (!has_granularity) {
3659 granularity = 0;
3660 }
3661 if (!has_buf_size) {
3662 buf_size = 0;
3663 }
3664 if (!has_unmap) {
3665 unmap = true;
3666 }
3667 if (!has_filter_node_name) {
3668 filter_node_name = NULL;
3669 }
3670 if (!has_copy_mode) {
3671 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
3672 }
3673 if (has_auto_finalize && !auto_finalize) {
3674 job_flags |= JOB_MANUAL_FINALIZE;
3675 }
3676 if (has_auto_dismiss && !auto_dismiss) {
3677 job_flags |= JOB_MANUAL_DISMISS;
3678 }
3679
3680 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3681 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3682 "a value in range [512B, 64MB]");
3683 return;
3684 }
3685 if (granularity & (granularity - 1)) {
3686 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3687 "power of 2");
3688 return;
3689 }
3690
3691 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3692 return;
3693 }
3694 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3695 return;
3696 }
3697
3698 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3699 sync = MIRROR_SYNC_MODE_FULL;
3700 }
3701
3702 /* pass the node name to replace to mirror start since it's loose coupling
3703 * and will allow to check whether the node still exist at mirror completion
3704 */
3705 mirror_start(job_id, bs, target,
3706 has_replaces ? replaces : NULL, job_flags,
3707 speed, granularity, buf_size, sync, backing_mode,
3708 on_source_error, on_target_error, unmap, filter_node_name,
3709 copy_mode, errp);
3710 }
3711
3712 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3713 {
3714 BlockDriverState *bs;
3715 BlockDriverState *source, *target_bs;
3716 AioContext *aio_context;
3717 BlockMirrorBackingMode backing_mode;
3718 Error *local_err = NULL;
3719 QDict *options = NULL;
3720 int flags;
3721 int64_t size;
3722 const char *format = arg->format;
3723
3724 bs = qmp_get_root_bs(arg->device, errp);
3725 if (!bs) {
3726 return;
3727 }
3728
3729 /* Early check to avoid creating target */
3730 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3731 return;
3732 }
3733
3734 aio_context = bdrv_get_aio_context(bs);
3735 aio_context_acquire(aio_context);
3736
3737 if (!arg->has_mode) {
3738 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3739 }
3740
3741 if (!arg->has_format) {
3742 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3743 ? NULL : bs->drv->format_name);
3744 }
3745
3746 flags = bs->open_flags | BDRV_O_RDWR;
3747 source = backing_bs(bs);
3748 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
3749 arg->sync = MIRROR_SYNC_MODE_FULL;
3750 }
3751 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3752 source = bs;
3753 }
3754
3755 size = bdrv_getlength(bs);
3756 if (size < 0) {
3757 error_setg_errno(errp, -size, "bdrv_getlength failed");
3758 goto out;
3759 }
3760
3761 if (arg->has_replaces) {
3762 BlockDriverState *to_replace_bs;
3763 AioContext *replace_aio_context;
3764 int64_t replace_size;
3765
3766 if (!arg->has_node_name) {
3767 error_setg(errp, "a node-name must be provided when replacing a"
3768 " named node of the graph");
3769 goto out;
3770 }
3771
3772 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
3773
3774 if (!to_replace_bs) {
3775 error_propagate(errp, local_err);
3776 goto out;
3777 }
3778
3779 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3780 aio_context_acquire(replace_aio_context);
3781 replace_size = bdrv_getlength(to_replace_bs);
3782 aio_context_release(replace_aio_context);
3783
3784 if (size != replace_size) {
3785 error_setg(errp, "cannot replace image with a mirror image of "
3786 "different size");
3787 goto out;
3788 }
3789 }
3790
3791 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3792 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3793 } else {
3794 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3795 }
3796
3797 /* Don't open backing image in create() */
3798 flags |= BDRV_O_NO_BACKING;
3799
3800 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
3801 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3802 {
3803 /* create new image w/o backing file */
3804 assert(format);
3805 bdrv_img_create(arg->target, format,
3806 NULL, NULL, NULL, size, flags, false, &local_err);
3807 } else {
3808 switch (arg->mode) {
3809 case NEW_IMAGE_MODE_EXISTING:
3810 break;
3811 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3812 /* create new image with backing file */
3813 bdrv_img_create(arg->target, format,
3814 source->filename,
3815 source->drv->format_name,
3816 NULL, size, flags, false, &local_err);
3817 break;
3818 default:
3819 abort();
3820 }
3821 }
3822
3823 if (local_err) {
3824 error_propagate(errp, local_err);
3825 goto out;
3826 }
3827
3828 options = qdict_new();
3829 if (arg->has_node_name) {
3830 qdict_put_str(options, "node-name", arg->node_name);
3831 }
3832 if (format) {
3833 qdict_put_str(options, "driver", format);
3834 }
3835
3836 /* Mirroring takes care of copy-on-write using the source's backing
3837 * file.
3838 */
3839 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3840 if (!target_bs) {
3841 goto out;
3842 }
3843
3844 bdrv_set_aio_context(target_bs, aio_context);
3845
3846 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3847 arg->has_replaces, arg->replaces, arg->sync,
3848 backing_mode, arg->has_speed, arg->speed,
3849 arg->has_granularity, arg->granularity,
3850 arg->has_buf_size, arg->buf_size,
3851 arg->has_on_source_error, arg->on_source_error,
3852 arg->has_on_target_error, arg->on_target_error,
3853 arg->has_unmap, arg->unmap,
3854 false, NULL,
3855 arg->has_copy_mode, arg->copy_mode,
3856 arg->has_auto_finalize, arg->auto_finalize,
3857 arg->has_auto_dismiss, arg->auto_dismiss,
3858 &local_err);
3859 bdrv_unref(target_bs);
3860 error_propagate(errp, local_err);
3861 out:
3862 aio_context_release(aio_context);
3863 }
3864
3865 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3866 const char *device, const char *target,
3867 bool has_replaces, const char *replaces,
3868 MirrorSyncMode sync,
3869 bool has_speed, int64_t speed,
3870 bool has_granularity, uint32_t granularity,
3871 bool has_buf_size, int64_t buf_size,
3872 bool has_on_source_error,
3873 BlockdevOnError on_source_error,
3874 bool has_on_target_error,
3875 BlockdevOnError on_target_error,
3876 bool has_filter_node_name,
3877 const char *filter_node_name,
3878 bool has_copy_mode, MirrorCopyMode copy_mode,
3879 bool has_auto_finalize, bool auto_finalize,
3880 bool has_auto_dismiss, bool auto_dismiss,
3881 Error **errp)
3882 {
3883 BlockDriverState *bs;
3884 BlockDriverState *target_bs;
3885 AioContext *aio_context;
3886 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3887 Error *local_err = NULL;
3888
3889 bs = qmp_get_root_bs(device, errp);
3890 if (!bs) {
3891 return;
3892 }
3893
3894 target_bs = bdrv_lookup_bs(target, target, errp);
3895 if (!target_bs) {
3896 return;
3897 }
3898
3899 aio_context = bdrv_get_aio_context(bs);
3900 aio_context_acquire(aio_context);
3901
3902 bdrv_set_aio_context(target_bs, aio_context);
3903
3904 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3905 has_replaces, replaces, sync, backing_mode,
3906 has_speed, speed,
3907 has_granularity, granularity,
3908 has_buf_size, buf_size,
3909 has_on_source_error, on_source_error,
3910 has_on_target_error, on_target_error,
3911 true, true,
3912 has_filter_node_name, filter_node_name,
3913 has_copy_mode, copy_mode,
3914 has_auto_finalize, auto_finalize,
3915 has_auto_dismiss, auto_dismiss,
3916 &local_err);
3917 error_propagate(errp, local_err);
3918
3919 aio_context_release(aio_context);
3920 }
3921
3922 /* Get a block job using its ID and acquire its AioContext */
3923 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3924 Error **errp)
3925 {
3926 BlockJob *job;
3927
3928 assert(id != NULL);
3929
3930 *aio_context = NULL;
3931
3932 job = block_job_get(id);
3933
3934 if (!job) {
3935 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3936 "Block job '%s' not found", id);
3937 return NULL;
3938 }
3939
3940 *aio_context = blk_get_aio_context(job->blk);
3941 aio_context_acquire(*aio_context);
3942
3943 return job;
3944 }
3945
3946 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3947 {
3948 AioContext *aio_context;
3949 BlockJob *job = find_block_job(device, &aio_context, errp);
3950
3951 if (!job) {
3952 return;
3953 }
3954
3955 block_job_set_speed(job, speed, errp);
3956 aio_context_release(aio_context);
3957 }
3958
3959 void qmp_block_job_cancel(const char *device,
3960 bool has_force, bool force, Error **errp)
3961 {
3962 AioContext *aio_context;
3963 BlockJob *job = find_block_job(device, &aio_context, errp);
3964
3965 if (!job) {
3966 return;
3967 }
3968
3969 if (!has_force) {
3970 force = false;
3971 }
3972
3973 if (job_user_paused(&job->job) && !force) {
3974 error_setg(errp, "The block job for device '%s' is currently paused",
3975 device);
3976 goto out;
3977 }
3978
3979 trace_qmp_block_job_cancel(job);
3980 job_user_cancel(&job->job, force, errp);
3981 out:
3982 aio_context_release(aio_context);
3983 }
3984
3985 void qmp_block_job_pause(const char *device, Error **errp)
3986 {
3987 AioContext *aio_context;
3988 BlockJob *job = find_block_job(device, &aio_context, errp);
3989
3990 if (!job) {
3991 return;
3992 }
3993
3994 trace_qmp_block_job_pause(job);
3995 job_user_pause(&job->job, errp);
3996 aio_context_release(aio_context);
3997 }
3998
3999 void qmp_block_job_resume(const char *device, Error **errp)
4000 {
4001 AioContext *aio_context;
4002 BlockJob *job = find_block_job(device, &aio_context, errp);
4003
4004 if (!job) {
4005 return;
4006 }
4007
4008 trace_qmp_block_job_resume(job);
4009 job_user_resume(&job->job, errp);
4010 aio_context_release(aio_context);
4011 }
4012
4013 void qmp_block_job_complete(const char *device, Error **errp)
4014 {
4015 AioContext *aio_context;
4016 BlockJob *job = find_block_job(device, &aio_context, errp);
4017
4018 if (!job) {
4019 return;
4020 }
4021
4022 trace_qmp_block_job_complete(job);
4023 job_complete(&job->job, errp);
4024 aio_context_release(aio_context);
4025 }
4026
4027 void qmp_block_job_finalize(const char *id, Error **errp)
4028 {
4029 AioContext *aio_context;
4030 BlockJob *job = find_block_job(id, &aio_context, errp);
4031
4032 if (!job) {
4033 return;
4034 }
4035
4036 trace_qmp_block_job_finalize(job);
4037 job_finalize(&job->job, errp);
4038 aio_context_release(aio_context);
4039 }
4040
4041 void qmp_block_job_dismiss(const char *id, Error **errp)
4042 {
4043 AioContext *aio_context;
4044 BlockJob *bjob = find_block_job(id, &aio_context, errp);
4045 Job *job;
4046
4047 if (!bjob) {
4048 return;
4049 }
4050
4051 trace_qmp_block_job_dismiss(bjob);
4052 job = &bjob->job;
4053 job_dismiss(&job, errp);
4054 aio_context_release(aio_context);
4055 }
4056
4057 void qmp_change_backing_file(const char *device,
4058 const char *image_node_name,
4059 const char *backing_file,
4060 Error **errp)
4061 {
4062 BlockDriverState *bs = NULL;
4063 AioContext *aio_context;
4064 BlockDriverState *image_bs = NULL;
4065 Error *local_err = NULL;
4066 bool ro;
4067 int open_flags;
4068 int ret;
4069
4070 bs = qmp_get_root_bs(device, errp);
4071 if (!bs) {
4072 return;
4073 }
4074
4075 aio_context = bdrv_get_aio_context(bs);
4076 aio_context_acquire(aio_context);
4077
4078 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
4079 if (local_err) {
4080 error_propagate(errp, local_err);
4081 goto out;
4082 }
4083
4084 if (!image_bs) {
4085 error_setg(errp, "image file not found");
4086 goto out;
4087 }
4088
4089 if (bdrv_find_base(image_bs) == image_bs) {
4090 error_setg(errp, "not allowing backing file change on an image "
4091 "without a backing file");
4092 goto out;
4093 }
4094
4095 /* even though we are not necessarily operating on bs, we need it to
4096 * determine if block ops are currently prohibited on the chain */
4097 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
4098 goto out;
4099 }
4100
4101 /* final sanity check */
4102 if (!bdrv_chain_contains(bs, image_bs)) {
4103 error_setg(errp, "'%s' and image file are not in the same chain",
4104 device);
4105 goto out;
4106 }
4107
4108 /* if not r/w, reopen to make r/w */
4109 open_flags = image_bs->open_flags;
4110 ro = bdrv_is_read_only(image_bs);
4111
4112 if (ro) {
4113 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
4114 if (local_err) {
4115 error_propagate(errp, local_err);
4116 goto out;
4117 }
4118 }
4119
4120 ret = bdrv_change_backing_file(image_bs, backing_file,
4121 image_bs->drv ? image_bs->drv->format_name : "");
4122
4123 if (ret < 0) {
4124 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
4125 backing_file);
4126 /* don't exit here, so we can try to restore open flags if
4127 * appropriate */
4128 }
4129
4130 if (ro) {
4131 bdrv_reopen(image_bs, open_flags, &local_err);
4132 error_propagate(errp, local_err);
4133 }
4134
4135 out:
4136 aio_context_release(aio_context);
4137 }
4138
4139 void hmp_drive_add_node(Monitor *mon, const char *optstr)
4140 {
4141 QemuOpts *opts;
4142 QDict *qdict;
4143 Error *local_err = NULL;
4144
4145 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
4146 if (!opts) {
4147 return;
4148 }
4149
4150 qdict = qemu_opts_to_qdict(opts, NULL);
4151
4152 if (!qdict_get_try_str(qdict, "node-name")) {
4153 qobject_unref(qdict);
4154 error_report("'node-name' needs to be specified");
4155 goto out;
4156 }
4157
4158 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
4159 if (!bs) {
4160 error_report_err(local_err);
4161 goto out;
4162 }
4163
4164 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4165
4166 out:
4167 qemu_opts_del(opts);
4168 }
4169
4170 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
4171 {
4172 BlockDriverState *bs;
4173 QObject *obj;
4174 Visitor *v = qobject_output_visitor_new(&obj);
4175 QDict *qdict;
4176 Error *local_err = NULL;
4177
4178 visit_type_BlockdevOptions(v, NULL, &options, &local_err);
4179 if (local_err) {
4180 error_propagate(errp, local_err);
4181 goto fail;
4182 }
4183
4184 visit_complete(v, &obj);
4185 qdict = qobject_to(QDict, obj);
4186
4187 qdict_flatten(qdict);
4188
4189 if (!qdict_get_try_str(qdict, "node-name")) {
4190 error_setg(errp, "'node-name' must be specified for the root node");
4191 goto fail;
4192 }
4193
4194 bs = bds_tree_init(qdict, errp);
4195 if (!bs) {
4196 goto fail;
4197 }
4198
4199 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4200
4201 fail:
4202 visit_free(v);
4203 }
4204
4205 void qmp_blockdev_del(const char *node_name, Error **errp)
4206 {
4207 AioContext *aio_context;
4208 BlockDriverState *bs;
4209
4210 bs = bdrv_find_node(node_name);
4211 if (!bs) {
4212 error_setg(errp, "Cannot find node %s", node_name);
4213 return;
4214 }
4215 if (bdrv_has_blk(bs)) {
4216 error_setg(errp, "Node %s is in use", node_name);
4217 return;
4218 }
4219 aio_context = bdrv_get_aio_context(bs);
4220 aio_context_acquire(aio_context);
4221
4222 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4223 goto out;
4224 }
4225
4226 if (!bs->monitor_list.tqe_prev) {
4227 error_setg(errp, "Node %s is not owned by the monitor",
4228 bs->node_name);
4229 goto out;
4230 }
4231
4232 if (bs->refcnt > 1) {
4233 error_setg(errp, "Block device %s is in use",
4234 bdrv_get_device_or_node_name(bs));
4235 goto out;
4236 }
4237
4238 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4239 bdrv_unref(bs);
4240
4241 out:
4242 aio_context_release(aio_context);
4243 }
4244
4245 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
4246 const char *child_name)
4247 {
4248 BdrvChild *child;
4249
4250 QLIST_FOREACH(child, &parent_bs->children, next) {
4251 if (strcmp(child->name, child_name) == 0) {
4252 return child;
4253 }
4254 }
4255
4256 return NULL;
4257 }
4258
4259 void qmp_x_blockdev_change(const char *parent, bool has_child,
4260 const char *child, bool has_node,
4261 const char *node, Error **errp)
4262 {
4263 BlockDriverState *parent_bs, *new_bs = NULL;
4264 BdrvChild *p_child;
4265
4266 parent_bs = bdrv_lookup_bs(parent, parent, errp);
4267 if (!parent_bs) {
4268 return;
4269 }
4270
4271 if (has_child == has_node) {
4272 if (has_child) {
4273 error_setg(errp, "The parameters child and node are in conflict");
4274 } else {
4275 error_setg(errp, "Either child or node must be specified");
4276 }
4277 return;
4278 }
4279
4280 if (has_child) {
4281 p_child = bdrv_find_child(parent_bs, child);
4282 if (!p_child) {
4283 error_setg(errp, "Node '%s' does not have child '%s'",
4284 parent, child);
4285 return;
4286 }
4287 bdrv_del_child(parent_bs, p_child, errp);
4288 }
4289
4290 if (has_node) {
4291 new_bs = bdrv_find_node(node);
4292 if (!new_bs) {
4293 error_setg(errp, "Node '%s' not found", node);
4294 return;
4295 }
4296 bdrv_add_child(parent_bs, new_bs, errp);
4297 }
4298 }
4299
4300 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4301 {
4302 BlockJobInfoList *head = NULL, **p_next = &head;
4303 BlockJob *job;
4304
4305 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
4306 BlockJobInfoList *elem;
4307 AioContext *aio_context;
4308
4309 if (block_job_is_internal(job)) {
4310 continue;
4311 }
4312 elem = g_new0(BlockJobInfoList, 1);
4313 aio_context = blk_get_aio_context(job->blk);
4314 aio_context_acquire(aio_context);
4315 elem->value = block_job_query(job, errp);
4316 aio_context_release(aio_context);
4317 if (!elem->value) {
4318 g_free(elem);
4319 qapi_free_BlockJobInfoList(head);
4320 return NULL;
4321 }
4322 *p_next = elem;
4323 p_next = &elem->next;
4324 }
4325
4326 return head;
4327 }
4328
4329 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
4330 bool has_force, bool force, Error **errp)
4331 {
4332 AioContext *old_context;
4333 AioContext *new_context;
4334 BlockDriverState *bs;
4335
4336 bs = bdrv_find_node(node_name);
4337 if (!bs) {
4338 error_setg(errp, "Cannot find node %s", node_name);
4339 return;
4340 }
4341
4342 /* Protects against accidents. */
4343 if (!(has_force && force) && bdrv_has_blk(bs)) {
4344 error_setg(errp, "Node %s is associated with a BlockBackend and could "
4345 "be in use (use force=true to override this check)",
4346 node_name);
4347 return;
4348 }
4349
4350 if (iothread->type == QTYPE_QSTRING) {
4351 IOThread *obj = iothread_by_id(iothread->u.s);
4352 if (!obj) {
4353 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
4354 return;
4355 }
4356
4357 new_context = iothread_get_aio_context(obj);
4358 } else {
4359 new_context = qemu_get_aio_context();
4360 }
4361
4362 old_context = bdrv_get_aio_context(bs);
4363 aio_context_acquire(old_context);
4364
4365 bdrv_set_aio_context(bs, new_context);
4366
4367 aio_context_release(old_context);
4368 }
4369
4370 void qmp_x_block_latency_histogram_set(
4371 const char *device,
4372 bool has_boundaries, uint64List *boundaries,
4373 bool has_boundaries_read, uint64List *boundaries_read,
4374 bool has_boundaries_write, uint64List *boundaries_write,
4375 bool has_boundaries_flush, uint64List *boundaries_flush,
4376 Error **errp)
4377 {
4378 BlockBackend *blk = blk_by_name(device);
4379 BlockAcctStats *stats;
4380
4381 if (!blk) {
4382 error_setg(errp, "Device '%s' not found", device);
4383 return;
4384 }
4385 stats = blk_get_stats(blk);
4386
4387 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write &&
4388 !has_boundaries_flush)
4389 {
4390 block_latency_histograms_clear(stats);
4391 return;
4392 }
4393
4394 if (has_boundaries || has_boundaries_read) {
4395 block_latency_histogram_set(
4396 stats, BLOCK_ACCT_READ,
4397 has_boundaries_read ? boundaries_read : boundaries);
4398 }
4399
4400 if (has_boundaries || has_boundaries_write) {
4401 block_latency_histogram_set(
4402 stats, BLOCK_ACCT_WRITE,
4403 has_boundaries_write ? boundaries_write : boundaries);
4404 }
4405
4406 if (has_boundaries || has_boundaries_flush) {
4407 block_latency_histogram_set(
4408 stats, BLOCK_ACCT_FLUSH,
4409 has_boundaries_flush ? boundaries_flush : boundaries);
4410 }
4411 }
4412
4413 QemuOptsList qemu_common_drive_opts = {
4414 .name = "drive",
4415 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4416 .desc = {
4417 {
4418 .name = "snapshot",
4419 .type = QEMU_OPT_BOOL,
4420 .help = "enable/disable snapshot mode",
4421 },{
4422 .name = "aio",
4423 .type = QEMU_OPT_STRING,
4424 .help = "host AIO implementation (threads, native)",
4425 },{
4426 .name = BDRV_OPT_CACHE_WB,
4427 .type = QEMU_OPT_BOOL,
4428 .help = "Enable writeback mode",
4429 },{
4430 .name = "format",
4431 .type = QEMU_OPT_STRING,
4432 .help = "disk format (raw, qcow2, ...)",
4433 },{
4434 .name = "rerror",
4435 .type = QEMU_OPT_STRING,
4436 .help = "read error action",
4437 },{
4438 .name = "werror",
4439 .type = QEMU_OPT_STRING,
4440 .help = "write error action",
4441 },{
4442 .name = BDRV_OPT_READ_ONLY,
4443 .type = QEMU_OPT_BOOL,
4444 .help = "open drive file as read-only",
4445 },
4446
4447 THROTTLE_OPTS,
4448
4449 {
4450 .name = "throttling.group",
4451 .type = QEMU_OPT_STRING,
4452 .help = "name of the block throttling group",
4453 },{
4454 .name = "copy-on-read",
4455 .type = QEMU_OPT_BOOL,
4456 .help = "copy read data from backing file into image file",
4457 },{
4458 .name = "detect-zeroes",
4459 .type = QEMU_OPT_STRING,
4460 .help = "try to optimize zero writes (off, on, unmap)",
4461 },{
4462 .name = "stats-account-invalid",
4463 .type = QEMU_OPT_BOOL,
4464 .help = "whether to account for invalid I/O operations "
4465 "in the statistics",
4466 },{
4467 .name = "stats-account-failed",
4468 .type = QEMU_OPT_BOOL,
4469 .help = "whether to account for failed I/O operations "
4470 "in the statistics",
4471 },
4472 { /* end of list */ }
4473 },
4474 };
4475
4476 QemuOptsList qemu_drive_opts = {
4477 .name = "drive",
4478 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4479 .desc = {
4480 /*
4481 * no elements => accept any params
4482 * validation will happen later
4483 */
4484 { /* end of list */ }
4485 },
4486 };
armbru's QEMU hackery