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