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block: Rewrite bdrv_next()
[qemu/ar7.git] / blockdev.c
bloba5df7e7590526e452ed23e8accd30dbd5714e3c3
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
54 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
55 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
56
57 static const char *const if_name[IF_COUNT] = {
58 [IF_NONE] = "none",
59 [IF_IDE] = "ide",
60 [IF_SCSI] = "scsi",
61 [IF_FLOPPY] = "floppy",
62 [IF_PFLASH] = "pflash",
63 [IF_MTD] = "mtd",
64 [IF_SD] = "sd",
65 [IF_VIRTIO] = "virtio",
66 [IF_XEN] = "xen",
67 };
68
69 static int if_max_devs[IF_COUNT] = {
70 /*
71 * Do not change these numbers! They govern how drive option
72 * index maps to unit and bus. That mapping is ABI.
73 *
74 * All controllers used to imlement if=T drives need to support
75 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
76 * Otherwise, some index values map to "impossible" bus, unit
77 * values.
78 *
79 * For instance, if you change [IF_SCSI] to 255, -drive
80 * if=scsi,index=12 no longer means bus=1,unit=5, but
81 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
82 * the drive can't be set up. Regression.
83 */
84 [IF_IDE] = 2,
85 [IF_SCSI] = 7,
86 };
87
88 /**
89 * Boards may call this to offer board-by-board overrides
90 * of the default, global values.
91 */
92 void override_max_devs(BlockInterfaceType type, int max_devs)
93 {
94 BlockBackend *blk;
95 DriveInfo *dinfo;
96
97 if (max_devs <= 0) {
98 return;
99 }
100
101 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
102 dinfo = blk_legacy_dinfo(blk);
103 if (dinfo->type == type) {
104 fprintf(stderr, "Cannot override units-per-bus property of"
105 " the %s interface, because a drive of that type has"
106 " already been added.\n", if_name[type]);
107 g_assert_not_reached();
108 }
109 }
110
111 if_max_devs[type] = max_devs;
112 }
113
114 /*
115 * We automatically delete the drive when a device using it gets
116 * unplugged. Questionable feature, but we can't just drop it.
117 * Device models call blockdev_mark_auto_del() to schedule the
118 * automatic deletion, and generic qdev code calls blockdev_auto_del()
119 * when deletion is actually safe.
120 */
121 void blockdev_mark_auto_del(BlockBackend *blk)
122 {
123 DriveInfo *dinfo = blk_legacy_dinfo(blk);
124 BlockDriverState *bs = blk_bs(blk);
125 AioContext *aio_context;
126
127 if (!dinfo) {
128 return;
129 }
130
131 if (bs) {
132 aio_context = bdrv_get_aio_context(bs);
133 aio_context_acquire(aio_context);
134
135 if (bs->job) {
136 block_job_cancel(bs->job);
137 }
138
139 aio_context_release(aio_context);
140 }
141
142 dinfo->auto_del = 1;
143 }
144
145 void blockdev_auto_del(BlockBackend *blk)
146 {
147 DriveInfo *dinfo = blk_legacy_dinfo(blk);
148
149 if (dinfo && dinfo->auto_del) {
150 monitor_remove_blk(blk);
151 blk_unref(blk);
152 }
153 }
154
155 /**
156 * Returns the current mapping of how many units per bus
157 * a particular interface can support.
158 *
159 * A positive integer indicates n units per bus.
160 * 0 implies the mapping has not been established.
161 * -1 indicates an invalid BlockInterfaceType was given.
162 */
163 int drive_get_max_devs(BlockInterfaceType type)
164 {
165 if (type >= IF_IDE && type < IF_COUNT) {
166 return if_max_devs[type];
167 }
168
169 return -1;
170 }
171
172 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
173 {
174 int max_devs = if_max_devs[type];
175 return max_devs ? index / max_devs : 0;
176 }
177
178 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
179 {
180 int max_devs = if_max_devs[type];
181 return max_devs ? index % max_devs : index;
182 }
183
184 QemuOpts *drive_def(const char *optstr)
185 {
186 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
187 }
188
189 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
190 const char *optstr)
191 {
192 QemuOpts *opts;
193
194 opts = drive_def(optstr);
195 if (!opts) {
196 return NULL;
197 }
198 if (type != IF_DEFAULT) {
199 qemu_opt_set(opts, "if", if_name[type], &error_abort);
200 }
201 if (index >= 0) {
202 qemu_opt_set_number(opts, "index", index, &error_abort);
203 }
204 if (file)
205 qemu_opt_set(opts, "file", file, &error_abort);
206 return opts;
207 }
208
209 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
210 {
211 BlockBackend *blk;
212 DriveInfo *dinfo;
213
214 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
215 dinfo = blk_legacy_dinfo(blk);
216 if (dinfo && dinfo->type == type
217 && dinfo->bus == bus && dinfo->unit == unit) {
218 return dinfo;
219 }
220 }
221
222 return NULL;
223 }
224
225 bool drive_check_orphaned(void)
226 {
227 BlockBackend *blk;
228 DriveInfo *dinfo;
229 bool rs = false;
230
231 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
232 dinfo = blk_legacy_dinfo(blk);
233 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
234 /* Unless this is a default drive, this may be an oversight. */
235 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
236 dinfo->type != IF_NONE) {
237 fprintf(stderr, "Warning: Orphaned drive without device: "
238 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
239 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
240 if_name[dinfo->type], dinfo->bus, dinfo->unit);
241 rs = true;
242 }
243 }
244
245 return rs;
246 }
247
248 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
249 {
250 return drive_get(type,
251 drive_index_to_bus_id(type, index),
252 drive_index_to_unit_id(type, index));
253 }
254
255 int drive_get_max_bus(BlockInterfaceType type)
256 {
257 int max_bus;
258 BlockBackend *blk;
259 DriveInfo *dinfo;
260
261 max_bus = -1;
262 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
263 dinfo = blk_legacy_dinfo(blk);
264 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
265 max_bus = dinfo->bus;
266 }
267 }
268 return max_bus;
269 }
270
271 /* Get a block device. This should only be used for single-drive devices
272 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
273 appropriate bus. */
274 DriveInfo *drive_get_next(BlockInterfaceType type)
275 {
276 static int next_block_unit[IF_COUNT];
277
278 return drive_get(type, 0, next_block_unit[type]++);
279 }
280
281 static void bdrv_format_print(void *opaque, const char *name)
282 {
283 error_printf(" %s", name);
284 }
285
286 typedef struct {
287 QEMUBH *bh;
288 BlockDriverState *bs;
289 } BDRVPutRefBH;
290
291 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
292 {
293 if (!strcmp(buf, "ignore")) {
294 return BLOCKDEV_ON_ERROR_IGNORE;
295 } else if (!is_read && !strcmp(buf, "enospc")) {
296 return BLOCKDEV_ON_ERROR_ENOSPC;
297 } else if (!strcmp(buf, "stop")) {
298 return BLOCKDEV_ON_ERROR_STOP;
299 } else if (!strcmp(buf, "report")) {
300 return BLOCKDEV_ON_ERROR_REPORT;
301 } else {
302 error_setg(errp, "'%s' invalid %s error action",
303 buf, is_read ? "read" : "write");
304 return -1;
305 }
306 }
307
308 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
309 Error **errp)
310 {
311 const QListEntry *entry;
312 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
313 switch (qobject_type(entry->value)) {
314
315 case QTYPE_QSTRING: {
316 unsigned long long length;
317 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
318 if (parse_uint_full(str, &length, 10) == 0 &&
319 length > 0 && length <= UINT_MAX) {
320 block_acct_add_interval(stats, (unsigned) length);
321 } else {
322 error_setg(errp, "Invalid interval length: %s", str);
323 return false;
324 }
325 break;
326 }
327
328 case QTYPE_QINT: {
329 int64_t length = qint_get_int(qobject_to_qint(entry->value));
330 if (length > 0 && length <= UINT_MAX) {
331 block_acct_add_interval(stats, (unsigned) length);
332 } else {
333 error_setg(errp, "Invalid interval length: %" PRId64, length);
334 return false;
335 }
336 break;
337 }
338
339 default:
340 error_setg(errp, "The specification of stats-intervals is invalid");
341 return false;
342 }
343 }
344 return true;
345 }
346
347 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
348
349 /* All parameters but @opts are optional and may be set to NULL. */
350 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
351 const char **throttling_group, ThrottleConfig *throttle_cfg,
352 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
353 {
354 const char *discard;
355 Error *local_error = NULL;
356 const char *aio;
357
358 if (bdrv_flags) {
359 if (!qemu_opt_get_bool(opts, "read-only", false)) {
360 *bdrv_flags |= BDRV_O_RDWR;
361 }
362 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
363 *bdrv_flags |= BDRV_O_COPY_ON_READ;
364 }
365
366 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
367 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
368 error_setg(errp, "Invalid discard option");
369 return;
370 }
371 }
372
373 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
374 if (!strcmp(aio, "native")) {
375 *bdrv_flags |= BDRV_O_NATIVE_AIO;
376 } else if (!strcmp(aio, "threads")) {
377 /* this is the default */
378 } else {
379 error_setg(errp, "invalid aio option");
380 return;
381 }
382 }
383 }
384
385 /* disk I/O throttling */
386 if (throttling_group) {
387 *throttling_group = qemu_opt_get(opts, "throttling.group");
388 }
389
390 if (throttle_cfg) {
391 throttle_config_init(throttle_cfg);
392 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
393 qemu_opt_get_number(opts, "throttling.bps-total", 0);
394 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
395 qemu_opt_get_number(opts, "throttling.bps-read", 0);
396 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
397 qemu_opt_get_number(opts, "throttling.bps-write", 0);
398 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
399 qemu_opt_get_number(opts, "throttling.iops-total", 0);
400 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
401 qemu_opt_get_number(opts, "throttling.iops-read", 0);
402 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
403 qemu_opt_get_number(opts, "throttling.iops-write", 0);
404
405 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
406 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
407 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
408 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
409 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
410 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
411 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
412 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
413 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
414 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
415 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
416 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
417
418 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
419 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
420 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
421 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
422 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
423 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
424 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
425 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
426 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
427 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
428 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
429 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
430
431 throttle_cfg->op_size =
432 qemu_opt_get_number(opts, "throttling.iops-size", 0);
433
434 if (!throttle_is_valid(throttle_cfg, errp)) {
435 return;
436 }
437 }
438
439 if (detect_zeroes) {
440 *detect_zeroes =
441 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
442 qemu_opt_get(opts, "detect-zeroes"),
443 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
444 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
445 &local_error);
446 if (local_error) {
447 error_propagate(errp, local_error);
448 return;
449 }
450
451 if (bdrv_flags &&
452 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
453 !(*bdrv_flags & BDRV_O_UNMAP))
454 {
455 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
456 "without setting discard operation to unmap");
457 return;
458 }
459 }
460 }
461
462 /* Takes the ownership of bs_opts */
463 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
464 Error **errp)
465 {
466 const char *buf;
467 int bdrv_flags = 0;
468 int on_read_error, on_write_error;
469 bool account_invalid, account_failed;
470 BlockBackend *blk;
471 BlockDriverState *bs;
472 ThrottleConfig cfg;
473 int snapshot = 0;
474 Error *error = NULL;
475 QemuOpts *opts;
476 QDict *interval_dict = NULL;
477 QList *interval_list = NULL;
478 const char *id;
479 BlockdevDetectZeroesOptions detect_zeroes =
480 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
481 const char *throttling_group = NULL;
482
483 /* Check common options by copying from bs_opts to opts, all other options
484 * stay in bs_opts for processing by bdrv_open(). */
485 id = qdict_get_try_str(bs_opts, "id");
486 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
487 if (error) {
488 error_propagate(errp, error);
489 goto err_no_opts;
490 }
491
492 qemu_opts_absorb_qdict(opts, bs_opts, &error);
493 if (error) {
494 error_propagate(errp, error);
495 goto early_err;
496 }
497
498 if (id) {
499 qdict_del(bs_opts, "id");
500 }
501
502 /* extract parameters */
503 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
504
505 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
506 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
507
508 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
509 qdict_array_split(interval_dict, &interval_list);
510
511 if (qdict_size(interval_dict) != 0) {
512 error_setg(errp, "Invalid option stats-intervals.%s",
513 qdict_first(interval_dict)->key);
514 goto early_err;
515 }
516
517 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
518 &detect_zeroes, &error);
519 if (error) {
520 error_propagate(errp, error);
521 goto early_err;
522 }
523
524 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
525 if (is_help_option(buf)) {
526 error_printf("Supported formats:");
527 bdrv_iterate_format(bdrv_format_print, NULL);
528 error_printf("\n");
529 goto early_err;
530 }
531
532 if (qdict_haskey(bs_opts, "driver")) {
533 error_setg(errp, "Cannot specify both 'driver' and 'format'");
534 goto early_err;
535 }
536 qdict_put(bs_opts, "driver", qstring_from_str(buf));
537 }
538
539 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
540 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
541 on_write_error = parse_block_error_action(buf, 0, &error);
542 if (error) {
543 error_propagate(errp, error);
544 goto early_err;
545 }
546 }
547
548 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
549 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
550 on_read_error = parse_block_error_action(buf, 1, &error);
551 if (error) {
552 error_propagate(errp, error);
553 goto early_err;
554 }
555 }
556
557 if (snapshot) {
558 bdrv_flags |= BDRV_O_SNAPSHOT;
559 }
560
561 /* init */
562 if ((!file || !*file) && !qdict_size(bs_opts)) {
563 BlockBackendRootState *blk_rs;
564
565 blk = blk_new(errp);
566 if (!blk) {
567 goto early_err;
568 }
569
570 blk_rs = blk_get_root_state(blk);
571 blk_rs->open_flags = bdrv_flags;
572 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
573 blk_rs->detect_zeroes = detect_zeroes;
574
575 if (throttle_enabled(&cfg)) {
576 if (!throttling_group) {
577 throttling_group = blk_name(blk);
578 }
579 blk_rs->throttle_group = g_strdup(throttling_group);
580 blk_rs->throttle_state = throttle_group_incref(throttling_group);
581 blk_rs->throttle_state->cfg = cfg;
582 }
583
584 QDECREF(bs_opts);
585 } else {
586 if (file && !*file) {
587 file = NULL;
588 }
589
590 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
591 * with other callers) rather than what we want as the real defaults.
592 * Apply the defaults here instead. */
593 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
594 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
595 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
596
597 if (runstate_check(RUN_STATE_INMIGRATE)) {
598 bdrv_flags |= BDRV_O_INACTIVE;
599 }
600
601 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
602 if (!blk) {
603 goto err_no_bs_opts;
604 }
605 bs = blk_bs(blk);
606
607 bs->detect_zeroes = detect_zeroes;
608
609 /* disk I/O throttling */
610 if (throttle_enabled(&cfg)) {
611 if (!throttling_group) {
612 throttling_group = blk_name(blk);
613 }
614 bdrv_io_limits_enable(bs, throttling_group);
615 bdrv_set_io_limits(bs, &cfg);
616 }
617
618 if (bdrv_key_required(bs)) {
619 autostart = 0;
620 }
621
622 block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
623
624 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
625 blk_unref(blk);
626 blk = NULL;
627 goto err_no_bs_opts;
628 }
629 }
630
631 blk_set_on_error(blk, on_read_error, on_write_error);
632
633 if (!monitor_add_blk(blk, qemu_opts_id(opts), errp)) {
634 blk_unref(blk);
635 blk = NULL;
636 goto err_no_bs_opts;
637 }
638
639 err_no_bs_opts:
640 qemu_opts_del(opts);
641 QDECREF(interval_dict);
642 QDECREF(interval_list);
643 return blk;
644
645 early_err:
646 qemu_opts_del(opts);
647 QDECREF(interval_dict);
648 QDECREF(interval_list);
649 err_no_opts:
650 QDECREF(bs_opts);
651 return NULL;
652 }
653
654 static QemuOptsList qemu_root_bds_opts;
655
656 /* Takes the ownership of bs_opts */
657 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
658 {
659 BlockDriverState *bs;
660 QemuOpts *opts;
661 Error *local_error = NULL;
662 BlockdevDetectZeroesOptions detect_zeroes;
663 int ret;
664 int bdrv_flags = 0;
665
666 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
667 if (!opts) {
668 goto fail;
669 }
670
671 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
672 if (local_error) {
673 error_propagate(errp, local_error);
674 goto fail;
675 }
676
677 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
678 &detect_zeroes, &local_error);
679 if (local_error) {
680 error_propagate(errp, local_error);
681 goto fail;
682 }
683
684 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
685 * with other callers) rather than what we want as the real defaults.
686 * Apply the defaults here instead. */
687 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
688 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
689 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
690
691 if (runstate_check(RUN_STATE_INMIGRATE)) {
692 bdrv_flags |= BDRV_O_INACTIVE;
693 }
694
695 bs = NULL;
696 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
697 if (ret < 0) {
698 goto fail_no_bs_opts;
699 }
700
701 bs->detect_zeroes = detect_zeroes;
702
703 fail_no_bs_opts:
704 qemu_opts_del(opts);
705 return bs;
706
707 fail:
708 qemu_opts_del(opts);
709 QDECREF(bs_opts);
710 return NULL;
711 }
712
713 void blockdev_close_all_bdrv_states(void)
714 {
715 BlockDriverState *bs, *next_bs;
716
717 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
718 AioContext *ctx = bdrv_get_aio_context(bs);
719
720 aio_context_acquire(ctx);
721 bdrv_unref(bs);
722 aio_context_release(ctx);
723 }
724 }
725
726 /* Iterates over the list of monitor-owned BlockDriverStates */
727 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
728 {
729 return bs ? QTAILQ_NEXT(bs, monitor_list)
730 : QTAILQ_FIRST(&monitor_bdrv_states);
731 }
732
733 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
734 Error **errp)
735 {
736 const char *value;
737
738 value = qemu_opt_get(opts, from);
739 if (value) {
740 if (qemu_opt_find(opts, to)) {
741 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
742 "same time", to, from);
743 return;
744 }
745 }
746
747 /* rename all items in opts */
748 while ((value = qemu_opt_get(opts, from))) {
749 qemu_opt_set(opts, to, value, &error_abort);
750 qemu_opt_unset(opts, from);
751 }
752 }
753
754 QemuOptsList qemu_legacy_drive_opts = {
755 .name = "drive",
756 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
757 .desc = {
758 {
759 .name = "bus",
760 .type = QEMU_OPT_NUMBER,
761 .help = "bus number",
762 },{
763 .name = "unit",
764 .type = QEMU_OPT_NUMBER,
765 .help = "unit number (i.e. lun for scsi)",
766 },{
767 .name = "index",
768 .type = QEMU_OPT_NUMBER,
769 .help = "index number",
770 },{
771 .name = "media",
772 .type = QEMU_OPT_STRING,
773 .help = "media type (disk, cdrom)",
774 },{
775 .name = "if",
776 .type = QEMU_OPT_STRING,
777 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
778 },{
779 .name = "cyls",
780 .type = QEMU_OPT_NUMBER,
781 .help = "number of cylinders (ide disk geometry)",
782 },{
783 .name = "heads",
784 .type = QEMU_OPT_NUMBER,
785 .help = "number of heads (ide disk geometry)",
786 },{
787 .name = "secs",
788 .type = QEMU_OPT_NUMBER,
789 .help = "number of sectors (ide disk geometry)",
790 },{
791 .name = "trans",
792 .type = QEMU_OPT_STRING,
793 .help = "chs translation (auto, lba, none)",
794 },{
795 .name = "boot",
796 .type = QEMU_OPT_BOOL,
797 .help = "(deprecated, ignored)",
798 },{
799 .name = "addr",
800 .type = QEMU_OPT_STRING,
801 .help = "pci address (virtio only)",
802 },{
803 .name = "serial",
804 .type = QEMU_OPT_STRING,
805 .help = "disk serial number",
806 },{
807 .name = "file",
808 .type = QEMU_OPT_STRING,
809 .help = "file name",
810 },
811
812 /* Options that are passed on, but have special semantics with -drive */
813 {
814 .name = "read-only",
815 .type = QEMU_OPT_BOOL,
816 .help = "open drive file as read-only",
817 },{
818 .name = "rerror",
819 .type = QEMU_OPT_STRING,
820 .help = "read error action",
821 },{
822 .name = "werror",
823 .type = QEMU_OPT_STRING,
824 .help = "write error action",
825 },{
826 .name = "copy-on-read",
827 .type = QEMU_OPT_BOOL,
828 .help = "copy read data from backing file into image file",
829 },
830
831 { /* end of list */ }
832 },
833 };
834
835 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
836 {
837 const char *value;
838 BlockBackend *blk;
839 DriveInfo *dinfo = NULL;
840 QDict *bs_opts;
841 QemuOpts *legacy_opts;
842 DriveMediaType media = MEDIA_DISK;
843 BlockInterfaceType type;
844 int cyls, heads, secs, translation;
845 int max_devs, bus_id, unit_id, index;
846 const char *devaddr;
847 const char *werror, *rerror;
848 bool read_only = false;
849 bool copy_on_read;
850 const char *serial;
851 const char *filename;
852 Error *local_err = NULL;
853 int i;
854
855 /* Change legacy command line options into QMP ones */
856 static const struct {
857 const char *from;
858 const char *to;
859 } opt_renames[] = {
860 { "iops", "throttling.iops-total" },
861 { "iops_rd", "throttling.iops-read" },
862 { "iops_wr", "throttling.iops-write" },
863
864 { "bps", "throttling.bps-total" },
865 { "bps_rd", "throttling.bps-read" },
866 { "bps_wr", "throttling.bps-write" },
867
868 { "iops_max", "throttling.iops-total-max" },
869 { "iops_rd_max", "throttling.iops-read-max" },
870 { "iops_wr_max", "throttling.iops-write-max" },
871
872 { "bps_max", "throttling.bps-total-max" },
873 { "bps_rd_max", "throttling.bps-read-max" },
874 { "bps_wr_max", "throttling.bps-write-max" },
875
876 { "iops_size", "throttling.iops-size" },
877
878 { "group", "throttling.group" },
879
880 { "readonly", "read-only" },
881 };
882
883 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
884 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
885 &local_err);
886 if (local_err) {
887 error_report_err(local_err);
888 return NULL;
889 }
890 }
891
892 value = qemu_opt_get(all_opts, "cache");
893 if (value) {
894 int flags = 0;
895
896 if (bdrv_parse_cache_flags(value, &flags) != 0) {
897 error_report("invalid cache option");
898 return NULL;
899 }
900
901 /* Specific options take precedence */
902 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
903 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
904 !!(flags & BDRV_O_CACHE_WB), &error_abort);
905 }
906 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
907 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
908 !!(flags & BDRV_O_NOCACHE), &error_abort);
909 }
910 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
911 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
912 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
913 }
914 qemu_opt_unset(all_opts, "cache");
915 }
916
917 /* Get a QDict for processing the options */
918 bs_opts = qdict_new();
919 qemu_opts_to_qdict(all_opts, bs_opts);
920
921 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
922 &error_abort);
923 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
924 if (local_err) {
925 error_report_err(local_err);
926 goto fail;
927 }
928
929 /* Deprecated option boot=[on|off] */
930 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
931 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
932 "ignored. Future versions will reject this parameter. Please "
933 "update your scripts.\n");
934 }
935
936 /* Media type */
937 value = qemu_opt_get(legacy_opts, "media");
938 if (value) {
939 if (!strcmp(value, "disk")) {
940 media = MEDIA_DISK;
941 } else if (!strcmp(value, "cdrom")) {
942 media = MEDIA_CDROM;
943 read_only = true;
944 } else {
945 error_report("'%s' invalid media", value);
946 goto fail;
947 }
948 }
949
950 /* copy-on-read is disabled with a warning for read-only devices */
951 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
952 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
953
954 if (read_only && copy_on_read) {
955 error_report("warning: disabling copy-on-read on read-only drive");
956 copy_on_read = false;
957 }
958
959 qdict_put(bs_opts, "read-only",
960 qstring_from_str(read_only ? "on" : "off"));
961 qdict_put(bs_opts, "copy-on-read",
962 qstring_from_str(copy_on_read ? "on" :"off"));
963
964 /* Controller type */
965 value = qemu_opt_get(legacy_opts, "if");
966 if (value) {
967 for (type = 0;
968 type < IF_COUNT && strcmp(value, if_name[type]);
969 type++) {
970 }
971 if (type == IF_COUNT) {
972 error_report("unsupported bus type '%s'", value);
973 goto fail;
974 }
975 } else {
976 type = block_default_type;
977 }
978
979 /* Geometry */
980 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
981 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
982 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
983
984 if (cyls || heads || secs) {
985 if (cyls < 1) {
986 error_report("invalid physical cyls number");
987 goto fail;
988 }
989 if (heads < 1) {
990 error_report("invalid physical heads number");
991 goto fail;
992 }
993 if (secs < 1) {
994 error_report("invalid physical secs number");
995 goto fail;
996 }
997 }
998
999 translation = BIOS_ATA_TRANSLATION_AUTO;
1000 value = qemu_opt_get(legacy_opts, "trans");
1001 if (value != NULL) {
1002 if (!cyls) {
1003 error_report("'%s' trans must be used with cyls, heads and secs",
1004 value);
1005 goto fail;
1006 }
1007 if (!strcmp(value, "none")) {
1008 translation = BIOS_ATA_TRANSLATION_NONE;
1009 } else if (!strcmp(value, "lba")) {
1010 translation = BIOS_ATA_TRANSLATION_LBA;
1011 } else if (!strcmp(value, "large")) {
1012 translation = BIOS_ATA_TRANSLATION_LARGE;
1013 } else if (!strcmp(value, "rechs")) {
1014 translation = BIOS_ATA_TRANSLATION_RECHS;
1015 } else if (!strcmp(value, "auto")) {
1016 translation = BIOS_ATA_TRANSLATION_AUTO;
1017 } else {
1018 error_report("'%s' invalid translation type", value);
1019 goto fail;
1020 }
1021 }
1022
1023 if (media == MEDIA_CDROM) {
1024 if (cyls || secs || heads) {
1025 error_report("CHS can't be set with media=cdrom");
1026 goto fail;
1027 }
1028 }
1029
1030 /* Device address specified by bus/unit or index.
1031 * If none was specified, try to find the first free one. */
1032 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
1033 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
1034 index = qemu_opt_get_number(legacy_opts, "index", -1);
1035
1036 max_devs = if_max_devs[type];
1037
1038 if (index != -1) {
1039 if (bus_id != 0 || unit_id != -1) {
1040 error_report("index cannot be used with bus and unit");
1041 goto fail;
1042 }
1043 bus_id = drive_index_to_bus_id(type, index);
1044 unit_id = drive_index_to_unit_id(type, index);
1045 }
1046
1047 if (unit_id == -1) {
1048 unit_id = 0;
1049 while (drive_get(type, bus_id, unit_id) != NULL) {
1050 unit_id++;
1051 if (max_devs && unit_id >= max_devs) {
1052 unit_id -= max_devs;
1053 bus_id++;
1054 }
1055 }
1056 }
1057
1058 if (max_devs && unit_id >= max_devs) {
1059 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1060 goto fail;
1061 }
1062
1063 if (drive_get(type, bus_id, unit_id) != NULL) {
1064 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1065 bus_id, unit_id, index);
1066 goto fail;
1067 }
1068
1069 /* Serial number */
1070 serial = qemu_opt_get(legacy_opts, "serial");
1071
1072 /* no id supplied -> create one */
1073 if (qemu_opts_id(all_opts) == NULL) {
1074 char *new_id;
1075 const char *mediastr = "";
1076 if (type == IF_IDE || type == IF_SCSI) {
1077 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1078 }
1079 if (max_devs) {
1080 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1081 mediastr, unit_id);
1082 } else {
1083 new_id = g_strdup_printf("%s%s%i", if_name[type],
1084 mediastr, unit_id);
1085 }
1086 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1087 g_free(new_id);
1088 }
1089
1090 /* Add virtio block device */
1091 devaddr = qemu_opt_get(legacy_opts, "addr");
1092 if (devaddr && type != IF_VIRTIO) {
1093 error_report("addr is not supported by this bus type");
1094 goto fail;
1095 }
1096
1097 if (type == IF_VIRTIO) {
1098 QemuOpts *devopts;
1099 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1100 &error_abort);
1101 if (arch_type == QEMU_ARCH_S390X) {
1102 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1103 } else {
1104 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1105 }
1106 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1107 &error_abort);
1108 if (devaddr) {
1109 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1110 }
1111 }
1112
1113 filename = qemu_opt_get(legacy_opts, "file");
1114
1115 /* Check werror/rerror compatibility with if=... */
1116 werror = qemu_opt_get(legacy_opts, "werror");
1117 if (werror != NULL) {
1118 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1119 type != IF_NONE) {
1120 error_report("werror is not supported by this bus type");
1121 goto fail;
1122 }
1123 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1124 }
1125
1126 rerror = qemu_opt_get(legacy_opts, "rerror");
1127 if (rerror != NULL) {
1128 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1129 type != IF_NONE) {
1130 error_report("rerror is not supported by this bus type");
1131 goto fail;
1132 }
1133 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1134 }
1135
1136 /* Actual block device init: Functionality shared with blockdev-add */
1137 blk = blockdev_init(filename, bs_opts, &local_err);
1138 bs_opts = NULL;
1139 if (!blk) {
1140 if (local_err) {
1141 error_report_err(local_err);
1142 }
1143 goto fail;
1144 } else {
1145 assert(!local_err);
1146 }
1147
1148 /* Create legacy DriveInfo */
1149 dinfo = g_malloc0(sizeof(*dinfo));
1150 dinfo->opts = all_opts;
1151
1152 dinfo->cyls = cyls;
1153 dinfo->heads = heads;
1154 dinfo->secs = secs;
1155 dinfo->trans = translation;
1156
1157 dinfo->type = type;
1158 dinfo->bus = bus_id;
1159 dinfo->unit = unit_id;
1160 dinfo->devaddr = devaddr;
1161 dinfo->serial = g_strdup(serial);
1162
1163 blk_set_legacy_dinfo(blk, dinfo);
1164
1165 switch(type) {
1166 case IF_IDE:
1167 case IF_SCSI:
1168 case IF_XEN:
1169 case IF_NONE:
1170 dinfo->media_cd = media == MEDIA_CDROM;
1171 break;
1172 default:
1173 break;
1174 }
1175
1176 fail:
1177 qemu_opts_del(legacy_opts);
1178 QDECREF(bs_opts);
1179 return dinfo;
1180 }
1181
1182 void hmp_commit(Monitor *mon, const QDict *qdict)
1183 {
1184 const char *device = qdict_get_str(qdict, "device");
1185 BlockBackend *blk;
1186 int ret;
1187
1188 if (!strcmp(device, "all")) {
1189 ret = blk_commit_all();
1190 } else {
1191 BlockDriverState *bs;
1192 AioContext *aio_context;
1193
1194 blk = blk_by_name(device);
1195 if (!blk) {
1196 monitor_printf(mon, "Device '%s' not found\n", device);
1197 return;
1198 }
1199 if (!blk_is_available(blk)) {
1200 monitor_printf(mon, "Device '%s' has no medium\n", device);
1201 return;
1202 }
1203
1204 bs = blk_bs(blk);
1205 aio_context = bdrv_get_aio_context(bs);
1206 aio_context_acquire(aio_context);
1207
1208 ret = bdrv_commit(bs);
1209
1210 aio_context_release(aio_context);
1211 }
1212 if (ret < 0) {
1213 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1214 strerror(-ret));
1215 }
1216 }
1217
1218 static void blockdev_do_action(TransactionAction *action, Error **errp)
1219 {
1220 TransactionActionList list;
1221
1222 list.value = action;
1223 list.next = NULL;
1224 qmp_transaction(&list, false, NULL, errp);
1225 }
1226
1227 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1228 bool has_node_name, const char *node_name,
1229 const char *snapshot_file,
1230 bool has_snapshot_node_name,
1231 const char *snapshot_node_name,
1232 bool has_format, const char *format,
1233 bool has_mode, NewImageMode mode, Error **errp)
1234 {
1235 BlockdevSnapshotSync snapshot = {
1236 .has_device = has_device,
1237 .device = (char *) device,
1238 .has_node_name = has_node_name,
1239 .node_name = (char *) node_name,
1240 .snapshot_file = (char *) snapshot_file,
1241 .has_snapshot_node_name = has_snapshot_node_name,
1242 .snapshot_node_name = (char *) snapshot_node_name,
1243 .has_format = has_format,
1244 .format = (char *) format,
1245 .has_mode = has_mode,
1246 .mode = mode,
1247 };
1248 TransactionAction action = {
1249 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1250 .u.blockdev_snapshot_sync = &snapshot,
1251 };
1252 blockdev_do_action(&action, errp);
1253 }
1254
1255 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1256 Error **errp)
1257 {
1258 BlockdevSnapshot snapshot_data = {
1259 .node = (char *) node,
1260 .overlay = (char *) overlay
1261 };
1262 TransactionAction action = {
1263 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1264 .u.blockdev_snapshot = &snapshot_data,
1265 };
1266 blockdev_do_action(&action, errp);
1267 }
1268
1269 void qmp_blockdev_snapshot_internal_sync(const char *device,
1270 const char *name,
1271 Error **errp)
1272 {
1273 BlockdevSnapshotInternal snapshot = {
1274 .device = (char *) device,
1275 .name = (char *) name
1276 };
1277 TransactionAction action = {
1278 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1279 .u.blockdev_snapshot_internal_sync = &snapshot,
1280 };
1281 blockdev_do_action(&action, errp);
1282 }
1283
1284 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1285 bool has_id,
1286 const char *id,
1287 bool has_name,
1288 const char *name,
1289 Error **errp)
1290 {
1291 BlockDriverState *bs;
1292 BlockBackend *blk;
1293 AioContext *aio_context;
1294 QEMUSnapshotInfo sn;
1295 Error *local_err = NULL;
1296 SnapshotInfo *info = NULL;
1297 int ret;
1298
1299 blk = blk_by_name(device);
1300 if (!blk) {
1301 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1302 "Device '%s' not found", device);
1303 return NULL;
1304 }
1305
1306 aio_context = blk_get_aio_context(blk);
1307 aio_context_acquire(aio_context);
1308
1309 if (!has_id) {
1310 id = NULL;
1311 }
1312
1313 if (!has_name) {
1314 name = NULL;
1315 }
1316
1317 if (!id && !name) {
1318 error_setg(errp, "Name or id must be provided");
1319 goto out_aio_context;
1320 }
1321
1322 if (!blk_is_available(blk)) {
1323 error_setg(errp, "Device '%s' has no medium", device);
1324 goto out_aio_context;
1325 }
1326 bs = blk_bs(blk);
1327
1328 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1329 goto out_aio_context;
1330 }
1331
1332 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1333 if (local_err) {
1334 error_propagate(errp, local_err);
1335 goto out_aio_context;
1336 }
1337 if (!ret) {
1338 error_setg(errp,
1339 "Snapshot with id '%s' and name '%s' does not exist on "
1340 "device '%s'",
1341 STR_OR_NULL(id), STR_OR_NULL(name), device);
1342 goto out_aio_context;
1343 }
1344
1345 bdrv_snapshot_delete(bs, id, name, &local_err);
1346 if (local_err) {
1347 error_propagate(errp, local_err);
1348 goto out_aio_context;
1349 }
1350
1351 aio_context_release(aio_context);
1352
1353 info = g_new0(SnapshotInfo, 1);
1354 info->id = g_strdup(sn.id_str);
1355 info->name = g_strdup(sn.name);
1356 info->date_nsec = sn.date_nsec;
1357 info->date_sec = sn.date_sec;
1358 info->vm_state_size = sn.vm_state_size;
1359 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1360 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1361
1362 return info;
1363
1364 out_aio_context:
1365 aio_context_release(aio_context);
1366 return NULL;
1367 }
1368
1369 /**
1370 * block_dirty_bitmap_lookup:
1371 * Return a dirty bitmap (if present), after validating
1372 * the node reference and bitmap names.
1373 *
1374 * @node: The name of the BDS node to search for bitmaps
1375 * @name: The name of the bitmap to search for
1376 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1377 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1378 * @errp: Output pointer for error information. Can be NULL.
1379 *
1380 * @return: A bitmap object on success, or NULL on failure.
1381 */
1382 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1383 const char *name,
1384 BlockDriverState **pbs,
1385 AioContext **paio,
1386 Error **errp)
1387 {
1388 BlockDriverState *bs;
1389 BdrvDirtyBitmap *bitmap;
1390 AioContext *aio_context;
1391
1392 if (!node) {
1393 error_setg(errp, "Node cannot be NULL");
1394 return NULL;
1395 }
1396 if (!name) {
1397 error_setg(errp, "Bitmap name cannot be NULL");
1398 return NULL;
1399 }
1400 bs = bdrv_lookup_bs(node, node, NULL);
1401 if (!bs) {
1402 error_setg(errp, "Node '%s' not found", node);
1403 return NULL;
1404 }
1405
1406 aio_context = bdrv_get_aio_context(bs);
1407 aio_context_acquire(aio_context);
1408
1409 bitmap = bdrv_find_dirty_bitmap(bs, name);
1410 if (!bitmap) {
1411 error_setg(errp, "Dirty bitmap '%s' not found", name);
1412 goto fail;
1413 }
1414
1415 if (pbs) {
1416 *pbs = bs;
1417 }
1418 if (paio) {
1419 *paio = aio_context;
1420 } else {
1421 aio_context_release(aio_context);
1422 }
1423
1424 return bitmap;
1425
1426 fail:
1427 aio_context_release(aio_context);
1428 return NULL;
1429 }
1430
1431 /* New and old BlockDriverState structs for atomic group operations */
1432
1433 typedef struct BlkActionState BlkActionState;
1434
1435 /**
1436 * BlkActionOps:
1437 * Table of operations that define an Action.
1438 *
1439 * @instance_size: Size of state struct, in bytes.
1440 * @prepare: Prepare the work, must NOT be NULL.
1441 * @commit: Commit the changes, can be NULL.
1442 * @abort: Abort the changes on fail, can be NULL.
1443 * @clean: Clean up resources after all transaction actions have called
1444 * commit() or abort(). Can be NULL.
1445 *
1446 * Only prepare() may fail. In a single transaction, only one of commit() or
1447 * abort() will be called. clean() will always be called if it is present.
1448 */
1449 typedef struct BlkActionOps {
1450 size_t instance_size;
1451 void (*prepare)(BlkActionState *common, Error **errp);
1452 void (*commit)(BlkActionState *common);
1453 void (*abort)(BlkActionState *common);
1454 void (*clean)(BlkActionState *common);
1455 } BlkActionOps;
1456
1457 /**
1458 * BlkActionState:
1459 * Describes one Action's state within a Transaction.
1460 *
1461 * @action: QAPI-defined enum identifying which Action to perform.
1462 * @ops: Table of ActionOps this Action can perform.
1463 * @block_job_txn: Transaction which this action belongs to.
1464 * @entry: List membership for all Actions in this Transaction.
1465 *
1466 * This structure must be arranged as first member in a subclassed type,
1467 * assuming that the compiler will also arrange it to the same offsets as the
1468 * base class.
1469 */
1470 struct BlkActionState {
1471 TransactionAction *action;
1472 const BlkActionOps *ops;
1473 BlockJobTxn *block_job_txn;
1474 TransactionProperties *txn_props;
1475 QSIMPLEQ_ENTRY(BlkActionState) entry;
1476 };
1477
1478 /* internal snapshot private data */
1479 typedef struct InternalSnapshotState {
1480 BlkActionState common;
1481 BlockDriverState *bs;
1482 AioContext *aio_context;
1483 QEMUSnapshotInfo sn;
1484 bool created;
1485 } InternalSnapshotState;
1486
1487
1488 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1489 {
1490 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1491 error_setg(errp,
1492 "Action '%s' does not support Transaction property "
1493 "completion-mode = %s",
1494 TransactionActionKind_lookup[s->action->type],
1495 ActionCompletionMode_lookup[s->txn_props->completion_mode]);
1496 return -1;
1497 }
1498 return 0;
1499 }
1500
1501 static void internal_snapshot_prepare(BlkActionState *common,
1502 Error **errp)
1503 {
1504 Error *local_err = NULL;
1505 const char *device;
1506 const char *name;
1507 BlockBackend *blk;
1508 BlockDriverState *bs;
1509 QEMUSnapshotInfo old_sn, *sn;
1510 bool ret;
1511 qemu_timeval tv;
1512 BlockdevSnapshotInternal *internal;
1513 InternalSnapshotState *state;
1514 int ret1;
1515
1516 g_assert(common->action->type ==
1517 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1518 internal = common->action->u.blockdev_snapshot_internal_sync;
1519 state = DO_UPCAST(InternalSnapshotState, common, common);
1520
1521 /* 1. parse input */
1522 device = internal->device;
1523 name = internal->name;
1524
1525 /* 2. check for validation */
1526 if (action_check_completion_mode(common, errp) < 0) {
1527 return;
1528 }
1529
1530 blk = blk_by_name(device);
1531 if (!blk) {
1532 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1533 "Device '%s' not found", device);
1534 return;
1535 }
1536
1537 /* AioContext is released in .clean() */
1538 state->aio_context = blk_get_aio_context(blk);
1539 aio_context_acquire(state->aio_context);
1540
1541 if (!blk_is_available(blk)) {
1542 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1543 return;
1544 }
1545 bs = blk_bs(blk);
1546
1547 state->bs = bs;
1548 bdrv_drained_begin(bs);
1549
1550 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1551 return;
1552 }
1553
1554 if (bdrv_is_read_only(bs)) {
1555 error_setg(errp, "Device '%s' is read only", device);
1556 return;
1557 }
1558
1559 if (!bdrv_can_snapshot(bs)) {
1560 error_setg(errp, "Block format '%s' used by device '%s' "
1561 "does not support internal snapshots",
1562 bs->drv->format_name, device);
1563 return;
1564 }
1565
1566 if (!strlen(name)) {
1567 error_setg(errp, "Name is empty");
1568 return;
1569 }
1570
1571 /* check whether a snapshot with name exist */
1572 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1573 &local_err);
1574 if (local_err) {
1575 error_propagate(errp, local_err);
1576 return;
1577 } else if (ret) {
1578 error_setg(errp,
1579 "Snapshot with name '%s' already exists on device '%s'",
1580 name, device);
1581 return;
1582 }
1583
1584 /* 3. take the snapshot */
1585 sn = &state->sn;
1586 pstrcpy(sn->name, sizeof(sn->name), name);
1587 qemu_gettimeofday(&tv);
1588 sn->date_sec = tv.tv_sec;
1589 sn->date_nsec = tv.tv_usec * 1000;
1590 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1591
1592 ret1 = bdrv_snapshot_create(bs, sn);
1593 if (ret1 < 0) {
1594 error_setg_errno(errp, -ret1,
1595 "Failed to create snapshot '%s' on device '%s'",
1596 name, device);
1597 return;
1598 }
1599
1600 /* 4. succeed, mark a snapshot is created */
1601 state->created = true;
1602 }
1603
1604 static void internal_snapshot_abort(BlkActionState *common)
1605 {
1606 InternalSnapshotState *state =
1607 DO_UPCAST(InternalSnapshotState, common, common);
1608 BlockDriverState *bs = state->bs;
1609 QEMUSnapshotInfo *sn = &state->sn;
1610 Error *local_error = NULL;
1611
1612 if (!state->created) {
1613 return;
1614 }
1615
1616 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1617 error_reportf_err(local_error,
1618 "Failed to delete snapshot with id '%s' and "
1619 "name '%s' on device '%s' in abort: ",
1620 sn->id_str, sn->name,
1621 bdrv_get_device_name(bs));
1622 }
1623 }
1624
1625 static void internal_snapshot_clean(BlkActionState *common)
1626 {
1627 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1628 common, common);
1629
1630 if (state->aio_context) {
1631 if (state->bs) {
1632 bdrv_drained_end(state->bs);
1633 }
1634 aio_context_release(state->aio_context);
1635 }
1636 }
1637
1638 /* external snapshot private data */
1639 typedef struct ExternalSnapshotState {
1640 BlkActionState common;
1641 BlockDriverState *old_bs;
1642 BlockDriverState *new_bs;
1643 AioContext *aio_context;
1644 } ExternalSnapshotState;
1645
1646 static void external_snapshot_prepare(BlkActionState *common,
1647 Error **errp)
1648 {
1649 int flags = 0, ret;
1650 QDict *options = NULL;
1651 Error *local_err = NULL;
1652 /* Device and node name of the image to generate the snapshot from */
1653 const char *device;
1654 const char *node_name;
1655 /* Reference to the new image (for 'blockdev-snapshot') */
1656 const char *snapshot_ref;
1657 /* File name of the new image (for 'blockdev-snapshot-sync') */
1658 const char *new_image_file;
1659 ExternalSnapshotState *state =
1660 DO_UPCAST(ExternalSnapshotState, common, common);
1661 TransactionAction *action = common->action;
1662
1663 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1664 * purpose but a different set of parameters */
1665 switch (action->type) {
1666 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1667 {
1668 BlockdevSnapshot *s = action->u.blockdev_snapshot;
1669 device = s->node;
1670 node_name = s->node;
1671 new_image_file = NULL;
1672 snapshot_ref = s->overlay;
1673 }
1674 break;
1675 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1676 {
1677 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1678 device = s->has_device ? s->device : NULL;
1679 node_name = s->has_node_name ? s->node_name : NULL;
1680 new_image_file = s->snapshot_file;
1681 snapshot_ref = NULL;
1682 }
1683 break;
1684 default:
1685 g_assert_not_reached();
1686 }
1687
1688 /* start processing */
1689 if (action_check_completion_mode(common, errp) < 0) {
1690 return;
1691 }
1692
1693 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1694 if (!state->old_bs) {
1695 return;
1696 }
1697
1698 /* Acquire AioContext now so any threads operating on old_bs stop */
1699 state->aio_context = bdrv_get_aio_context(state->old_bs);
1700 aio_context_acquire(state->aio_context);
1701 bdrv_drained_begin(state->old_bs);
1702
1703 if (!bdrv_is_inserted(state->old_bs)) {
1704 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1705 return;
1706 }
1707
1708 if (bdrv_op_is_blocked(state->old_bs,
1709 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1710 return;
1711 }
1712
1713 if (!bdrv_is_read_only(state->old_bs)) {
1714 if (bdrv_flush(state->old_bs)) {
1715 error_setg(errp, QERR_IO_ERROR);
1716 return;
1717 }
1718 }
1719
1720 if (!bdrv_is_first_non_filter(state->old_bs)) {
1721 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1722 return;
1723 }
1724
1725 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1726 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1727 const char *format = s->has_format ? s->format : "qcow2";
1728 enum NewImageMode mode;
1729 const char *snapshot_node_name =
1730 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1731
1732 if (node_name && !snapshot_node_name) {
1733 error_setg(errp, "New snapshot node name missing");
1734 return;
1735 }
1736
1737 if (snapshot_node_name &&
1738 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1739 error_setg(errp, "New snapshot node name already in use");
1740 return;
1741 }
1742
1743 flags = state->old_bs->open_flags;
1744
1745 /* create new image w/backing file */
1746 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1747 if (mode != NEW_IMAGE_MODE_EXISTING) {
1748 int64_t size = bdrv_getlength(state->old_bs);
1749 if (size < 0) {
1750 error_setg_errno(errp, -size, "bdrv_getlength failed");
1751 return;
1752 }
1753 bdrv_img_create(new_image_file, format,
1754 state->old_bs->filename,
1755 state->old_bs->drv->format_name,
1756 NULL, size, flags, &local_err, false);
1757 if (local_err) {
1758 error_propagate(errp, local_err);
1759 return;
1760 }
1761 }
1762
1763 options = qdict_new();
1764 if (s->has_snapshot_node_name) {
1765 qdict_put(options, "node-name",
1766 qstring_from_str(snapshot_node_name));
1767 }
1768 qdict_put(options, "driver", qstring_from_str(format));
1769
1770 flags |= BDRV_O_NO_BACKING;
1771 }
1772
1773 assert(state->new_bs == NULL);
1774 ret = bdrv_open(&state->new_bs, new_image_file, snapshot_ref, options,
1775 flags, errp);
1776 /* We will manually add the backing_hd field to the bs later */
1777 if (ret != 0) {
1778 return;
1779 }
1780
1781 if (state->new_bs->blk != NULL) {
1782 error_setg(errp, "The snapshot is already in use by %s",
1783 blk_name(state->new_bs->blk));
1784 return;
1785 }
1786
1787 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1788 errp)) {
1789 return;
1790 }
1791
1792 if (state->new_bs->backing != NULL) {
1793 error_setg(errp, "The snapshot already has a backing image");
1794 return;
1795 }
1796
1797 if (!state->new_bs->drv->supports_backing) {
1798 error_setg(errp, "The snapshot does not support backing images");
1799 }
1800 }
1801
1802 static void external_snapshot_commit(BlkActionState *common)
1803 {
1804 ExternalSnapshotState *state =
1805 DO_UPCAST(ExternalSnapshotState, common, common);
1806
1807 bdrv_set_aio_context(state->new_bs, state->aio_context);
1808
1809 /* This removes our old bs and adds the new bs */
1810 bdrv_append(state->new_bs, state->old_bs);
1811 /* We don't need (or want) to use the transactional
1812 * bdrv_reopen_multiple() across all the entries at once, because we
1813 * don't want to abort all of them if one of them fails the reopen */
1814 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1815 NULL);
1816 }
1817
1818 static void external_snapshot_abort(BlkActionState *common)
1819 {
1820 ExternalSnapshotState *state =
1821 DO_UPCAST(ExternalSnapshotState, common, common);
1822 if (state->new_bs) {
1823 bdrv_unref(state->new_bs);
1824 }
1825 }
1826
1827 static void external_snapshot_clean(BlkActionState *common)
1828 {
1829 ExternalSnapshotState *state =
1830 DO_UPCAST(ExternalSnapshotState, common, common);
1831 if (state->aio_context) {
1832 bdrv_drained_end(state->old_bs);
1833 aio_context_release(state->aio_context);
1834 }
1835 }
1836
1837 typedef struct DriveBackupState {
1838 BlkActionState common;
1839 BlockDriverState *bs;
1840 AioContext *aio_context;
1841 BlockJob *job;
1842 } DriveBackupState;
1843
1844 static void do_drive_backup(const char *device, const char *target,
1845 bool has_format, const char *format,
1846 enum MirrorSyncMode sync,
1847 bool has_mode, enum NewImageMode mode,
1848 bool has_speed, int64_t speed,
1849 bool has_bitmap, const char *bitmap,
1850 bool has_on_source_error,
1851 BlockdevOnError on_source_error,
1852 bool has_on_target_error,
1853 BlockdevOnError on_target_error,
1854 BlockJobTxn *txn, Error **errp);
1855
1856 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1857 {
1858 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1859 BlockBackend *blk;
1860 DriveBackup *backup;
1861 Error *local_err = NULL;
1862
1863 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1864 backup = common->action->u.drive_backup;
1865
1866 blk = blk_by_name(backup->device);
1867 if (!blk) {
1868 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1869 "Device '%s' not found", backup->device);
1870 return;
1871 }
1872
1873 if (!blk_is_available(blk)) {
1874 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1875 return;
1876 }
1877
1878 /* AioContext is released in .clean() */
1879 state->aio_context = blk_get_aio_context(blk);
1880 aio_context_acquire(state->aio_context);
1881 bdrv_drained_begin(blk_bs(blk));
1882 state->bs = blk_bs(blk);
1883
1884 do_drive_backup(backup->device, backup->target,
1885 backup->has_format, backup->format,
1886 backup->sync,
1887 backup->has_mode, backup->mode,
1888 backup->has_speed, backup->speed,
1889 backup->has_bitmap, backup->bitmap,
1890 backup->has_on_source_error, backup->on_source_error,
1891 backup->has_on_target_error, backup->on_target_error,
1892 common->block_job_txn, &local_err);
1893 if (local_err) {
1894 error_propagate(errp, local_err);
1895 return;
1896 }
1897
1898 state->job = state->bs->job;
1899 }
1900
1901 static void drive_backup_abort(BlkActionState *common)
1902 {
1903 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1904 BlockDriverState *bs = state->bs;
1905
1906 /* Only cancel if it's the job we started */
1907 if (bs && bs->job && bs->job == state->job) {
1908 block_job_cancel_sync(bs->job);
1909 }
1910 }
1911
1912 static void drive_backup_clean(BlkActionState *common)
1913 {
1914 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1915
1916 if (state->aio_context) {
1917 bdrv_drained_end(state->bs);
1918 aio_context_release(state->aio_context);
1919 }
1920 }
1921
1922 typedef struct BlockdevBackupState {
1923 BlkActionState common;
1924 BlockDriverState *bs;
1925 BlockJob *job;
1926 AioContext *aio_context;
1927 } BlockdevBackupState;
1928
1929 static void do_blockdev_backup(const char *device, const char *target,
1930 enum MirrorSyncMode sync,
1931 bool has_speed, int64_t speed,
1932 bool has_on_source_error,
1933 BlockdevOnError on_source_error,
1934 bool has_on_target_error,
1935 BlockdevOnError on_target_error,
1936 BlockJobTxn *txn, Error **errp);
1937
1938 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1939 {
1940 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1941 BlockdevBackup *backup;
1942 BlockBackend *blk, *target;
1943 Error *local_err = NULL;
1944
1945 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1946 backup = common->action->u.blockdev_backup;
1947
1948 blk = blk_by_name(backup->device);
1949 if (!blk) {
1950 error_setg(errp, "Device '%s' not found", backup->device);
1951 return;
1952 }
1953
1954 if (!blk_is_available(blk)) {
1955 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1956 return;
1957 }
1958
1959 target = blk_by_name(backup->target);
1960 if (!target) {
1961 error_setg(errp, "Device '%s' not found", backup->target);
1962 return;
1963 }
1964
1965 /* AioContext is released in .clean() */
1966 state->aio_context = blk_get_aio_context(blk);
1967 if (state->aio_context != blk_get_aio_context(target)) {
1968 state->aio_context = NULL;
1969 error_setg(errp, "Backup between two IO threads is not implemented");
1970 return;
1971 }
1972 aio_context_acquire(state->aio_context);
1973 state->bs = blk_bs(blk);
1974 bdrv_drained_begin(state->bs);
1975
1976 do_blockdev_backup(backup->device, backup->target,
1977 backup->sync,
1978 backup->has_speed, backup->speed,
1979 backup->has_on_source_error, backup->on_source_error,
1980 backup->has_on_target_error, backup->on_target_error,
1981 common->block_job_txn, &local_err);
1982 if (local_err) {
1983 error_propagate(errp, local_err);
1984 return;
1985 }
1986
1987 state->job = state->bs->job;
1988 }
1989
1990 static void blockdev_backup_abort(BlkActionState *common)
1991 {
1992 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1993 BlockDriverState *bs = state->bs;
1994
1995 /* Only cancel if it's the job we started */
1996 if (bs && bs->job && bs->job == state->job) {
1997 block_job_cancel_sync(bs->job);
1998 }
1999 }
2000
2001 static void blockdev_backup_clean(BlkActionState *common)
2002 {
2003 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2004
2005 if (state->aio_context) {
2006 bdrv_drained_end(state->bs);
2007 aio_context_release(state->aio_context);
2008 }
2009 }
2010
2011 typedef struct BlockDirtyBitmapState {
2012 BlkActionState common;
2013 BdrvDirtyBitmap *bitmap;
2014 BlockDriverState *bs;
2015 AioContext *aio_context;
2016 HBitmap *backup;
2017 bool prepared;
2018 } BlockDirtyBitmapState;
2019
2020 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2021 Error **errp)
2022 {
2023 Error *local_err = NULL;
2024 BlockDirtyBitmapAdd *action;
2025 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2026 common, common);
2027
2028 if (action_check_completion_mode(common, errp) < 0) {
2029 return;
2030 }
2031
2032 action = common->action->u.block_dirty_bitmap_add;
2033 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2034 qmp_block_dirty_bitmap_add(action->node, action->name,
2035 action->has_granularity, action->granularity,
2036 &local_err);
2037
2038 if (!local_err) {
2039 state->prepared = true;
2040 } else {
2041 error_propagate(errp, local_err);
2042 }
2043 }
2044
2045 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2046 {
2047 BlockDirtyBitmapAdd *action;
2048 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2049 common, common);
2050
2051 action = common->action->u.block_dirty_bitmap_add;
2052 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2053 * then the node reference and bitmap name must have been valid.
2054 */
2055 if (state->prepared) {
2056 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2057 }
2058 }
2059
2060 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2061 Error **errp)
2062 {
2063 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2064 common, common);
2065 BlockDirtyBitmap *action;
2066
2067 if (action_check_completion_mode(common, errp) < 0) {
2068 return;
2069 }
2070
2071 action = common->action->u.block_dirty_bitmap_clear;
2072 state->bitmap = block_dirty_bitmap_lookup(action->node,
2073 action->name,
2074 &state->bs,
2075 &state->aio_context,
2076 errp);
2077 if (!state->bitmap) {
2078 return;
2079 }
2080
2081 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2082 error_setg(errp, "Cannot modify a frozen bitmap");
2083 return;
2084 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2085 error_setg(errp, "Cannot clear a disabled bitmap");
2086 return;
2087 }
2088
2089 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2090 /* AioContext is released in .clean() */
2091 }
2092
2093 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2094 {
2095 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2096 common, common);
2097
2098 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2099 }
2100
2101 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2102 {
2103 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2104 common, common);
2105
2106 hbitmap_free(state->backup);
2107 }
2108
2109 static void block_dirty_bitmap_clear_clean(BlkActionState *common)
2110 {
2111 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2112 common, common);
2113
2114 if (state->aio_context) {
2115 aio_context_release(state->aio_context);
2116 }
2117 }
2118
2119 static void abort_prepare(BlkActionState *common, Error **errp)
2120 {
2121 error_setg(errp, "Transaction aborted using Abort action");
2122 }
2123
2124 static void abort_commit(BlkActionState *common)
2125 {
2126 g_assert_not_reached(); /* this action never succeeds */
2127 }
2128
2129 static const BlkActionOps actions[] = {
2130 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2131 .instance_size = sizeof(ExternalSnapshotState),
2132 .prepare = external_snapshot_prepare,
2133 .commit = external_snapshot_commit,
2134 .abort = external_snapshot_abort,
2135 .clean = external_snapshot_clean,
2136 },
2137 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2138 .instance_size = sizeof(ExternalSnapshotState),
2139 .prepare = external_snapshot_prepare,
2140 .commit = external_snapshot_commit,
2141 .abort = external_snapshot_abort,
2142 .clean = external_snapshot_clean,
2143 },
2144 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2145 .instance_size = sizeof(DriveBackupState),
2146 .prepare = drive_backup_prepare,
2147 .abort = drive_backup_abort,
2148 .clean = drive_backup_clean,
2149 },
2150 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2151 .instance_size = sizeof(BlockdevBackupState),
2152 .prepare = blockdev_backup_prepare,
2153 .abort = blockdev_backup_abort,
2154 .clean = blockdev_backup_clean,
2155 },
2156 [TRANSACTION_ACTION_KIND_ABORT] = {
2157 .instance_size = sizeof(BlkActionState),
2158 .prepare = abort_prepare,
2159 .commit = abort_commit,
2160 },
2161 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2162 .instance_size = sizeof(InternalSnapshotState),
2163 .prepare = internal_snapshot_prepare,
2164 .abort = internal_snapshot_abort,
2165 .clean = internal_snapshot_clean,
2166 },
2167 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2168 .instance_size = sizeof(BlockDirtyBitmapState),
2169 .prepare = block_dirty_bitmap_add_prepare,
2170 .abort = block_dirty_bitmap_add_abort,
2171 },
2172 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2173 .instance_size = sizeof(BlockDirtyBitmapState),
2174 .prepare = block_dirty_bitmap_clear_prepare,
2175 .commit = block_dirty_bitmap_clear_commit,
2176 .abort = block_dirty_bitmap_clear_abort,
2177 .clean = block_dirty_bitmap_clear_clean,
2178 }
2179 };
2180
2181 /**
2182 * Allocate a TransactionProperties structure if necessary, and fill
2183 * that structure with desired defaults if they are unset.
2184 */
2185 static TransactionProperties *get_transaction_properties(
2186 TransactionProperties *props)
2187 {
2188 if (!props) {
2189 props = g_new0(TransactionProperties, 1);
2190 }
2191
2192 if (!props->has_completion_mode) {
2193 props->has_completion_mode = true;
2194 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2195 }
2196
2197 return props;
2198 }
2199
2200 /*
2201 * 'Atomic' group operations. The operations are performed as a set, and if
2202 * any fail then we roll back all operations in the group.
2203 */
2204 void qmp_transaction(TransactionActionList *dev_list,
2205 bool has_props,
2206 struct TransactionProperties *props,
2207 Error **errp)
2208 {
2209 TransactionActionList *dev_entry = dev_list;
2210 BlockJobTxn *block_job_txn = NULL;
2211 BlkActionState *state, *next;
2212 Error *local_err = NULL;
2213
2214 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2215 QSIMPLEQ_INIT(&snap_bdrv_states);
2216
2217 /* Does this transaction get canceled as a group on failure?
2218 * If not, we don't really need to make a BlockJobTxn.
2219 */
2220 props = get_transaction_properties(props);
2221 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2222 block_job_txn = block_job_txn_new();
2223 }
2224
2225 /* drain all i/o before any operations */
2226 bdrv_drain_all();
2227
2228 /* We don't do anything in this loop that commits us to the operations */
2229 while (NULL != dev_entry) {
2230 TransactionAction *dev_info = NULL;
2231 const BlkActionOps *ops;
2232
2233 dev_info = dev_entry->value;
2234 dev_entry = dev_entry->next;
2235
2236 assert(dev_info->type < ARRAY_SIZE(actions));
2237
2238 ops = &actions[dev_info->type];
2239 assert(ops->instance_size > 0);
2240
2241 state = g_malloc0(ops->instance_size);
2242 state->ops = ops;
2243 state->action = dev_info;
2244 state->block_job_txn = block_job_txn;
2245 state->txn_props = props;
2246 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2247
2248 state->ops->prepare(state, &local_err);
2249 if (local_err) {
2250 error_propagate(errp, local_err);
2251 goto delete_and_fail;
2252 }
2253 }
2254
2255 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2256 if (state->ops->commit) {
2257 state->ops->commit(state);
2258 }
2259 }
2260
2261 /* success */
2262 goto exit;
2263
2264 delete_and_fail:
2265 /* failure, and it is all-or-none; roll back all operations */
2266 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2267 if (state->ops->abort) {
2268 state->ops->abort(state);
2269 }
2270 }
2271 exit:
2272 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2273 if (state->ops->clean) {
2274 state->ops->clean(state);
2275 }
2276 g_free(state);
2277 }
2278 if (!has_props) {
2279 qapi_free_TransactionProperties(props);
2280 }
2281 block_job_txn_unref(block_job_txn);
2282 }
2283
2284 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
2285 {
2286 Error *local_err = NULL;
2287
2288 qmp_blockdev_open_tray(device, has_force, force, &local_err);
2289 if (local_err) {
2290 error_propagate(errp, local_err);
2291 return;
2292 }
2293
2294 qmp_x_blockdev_remove_medium(device, errp);
2295 }
2296
2297 void qmp_block_passwd(bool has_device, const char *device,
2298 bool has_node_name, const char *node_name,
2299 const char *password, Error **errp)
2300 {
2301 Error *local_err = NULL;
2302 BlockDriverState *bs;
2303 AioContext *aio_context;
2304
2305 bs = bdrv_lookup_bs(has_device ? device : NULL,
2306 has_node_name ? node_name : NULL,
2307 &local_err);
2308 if (local_err) {
2309 error_propagate(errp, local_err);
2310 return;
2311 }
2312
2313 aio_context = bdrv_get_aio_context(bs);
2314 aio_context_acquire(aio_context);
2315
2316 bdrv_add_key(bs, password, errp);
2317
2318 aio_context_release(aio_context);
2319 }
2320
2321 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force,
2322 Error **errp)
2323 {
2324 BlockBackend *blk;
2325 bool locked;
2326
2327 if (!has_force) {
2328 force = false;
2329 }
2330
2331 blk = blk_by_name(device);
2332 if (!blk) {
2333 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2334 "Device '%s' not found", device);
2335 return;
2336 }
2337
2338 if (!blk_dev_has_removable_media(blk)) {
2339 error_setg(errp, "Device '%s' is not removable", device);
2340 return;
2341 }
2342
2343 if (!blk_dev_has_tray(blk)) {
2344 /* Ignore this command on tray-less devices */
2345 return;
2346 }
2347
2348 if (blk_dev_is_tray_open(blk)) {
2349 return;
2350 }
2351
2352 locked = blk_dev_is_medium_locked(blk);
2353 if (locked) {
2354 blk_dev_eject_request(blk, force);
2355 }
2356
2357 if (!locked || force) {
2358 blk_dev_change_media_cb(blk, false);
2359 }
2360 }
2361
2362 void qmp_blockdev_close_tray(const char *device, Error **errp)
2363 {
2364 BlockBackend *blk;
2365
2366 blk = blk_by_name(device);
2367 if (!blk) {
2368 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2369 "Device '%s' not found", device);
2370 return;
2371 }
2372
2373 if (!blk_dev_has_removable_media(blk)) {
2374 error_setg(errp, "Device '%s' is not removable", device);
2375 return;
2376 }
2377
2378 if (!blk_dev_has_tray(blk)) {
2379 /* Ignore this command on tray-less devices */
2380 return;
2381 }
2382
2383 if (!blk_dev_is_tray_open(blk)) {
2384 return;
2385 }
2386
2387 blk_dev_change_media_cb(blk, true);
2388 }
2389
2390 void qmp_x_blockdev_remove_medium(const char *device, Error **errp)
2391 {
2392 BlockBackend *blk;
2393 BlockDriverState *bs;
2394 AioContext *aio_context;
2395 bool has_device;
2396
2397 blk = blk_by_name(device);
2398 if (!blk) {
2399 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2400 "Device '%s' not found", device);
2401 return;
2402 }
2403
2404 /* For BBs without a device, we can exchange the BDS tree at will */
2405 has_device = blk_get_attached_dev(blk);
2406
2407 if (has_device && !blk_dev_has_removable_media(blk)) {
2408 error_setg(errp, "Device '%s' is not removable", device);
2409 return;
2410 }
2411
2412 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2413 error_setg(errp, "Tray of device '%s' is not open", device);
2414 return;
2415 }
2416
2417 bs = blk_bs(blk);
2418 if (!bs) {
2419 return;
2420 }
2421
2422 aio_context = bdrv_get_aio_context(bs);
2423 aio_context_acquire(aio_context);
2424
2425 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2426 goto out;
2427 }
2428
2429 /* This follows the convention established by bdrv_make_anon() */
2430 if (bs->device_list.tqe_prev) {
2431 bdrv_device_remove(bs);
2432 }
2433
2434 blk_remove_bs(blk);
2435
2436 if (!blk_dev_has_tray(blk)) {
2437 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2438 * called at all); therefore, the medium needs to be ejected here.
2439 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2440 * value passed here (i.e. false). */
2441 blk_dev_change_media_cb(blk, false);
2442 }
2443
2444 out:
2445 aio_context_release(aio_context);
2446 }
2447
2448 static void qmp_blockdev_insert_anon_medium(const char *device,
2449 BlockDriverState *bs, Error **errp)
2450 {
2451 BlockBackend *blk;
2452 bool has_device;
2453
2454 blk = blk_by_name(device);
2455 if (!blk) {
2456 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2457 "Device '%s' not found", device);
2458 return;
2459 }
2460
2461 /* For BBs without a device, we can exchange the BDS tree at will */
2462 has_device = blk_get_attached_dev(blk);
2463
2464 if (has_device && !blk_dev_has_removable_media(blk)) {
2465 error_setg(errp, "Device '%s' is not removable", device);
2466 return;
2467 }
2468
2469 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2470 error_setg(errp, "Tray of device '%s' is not open", device);
2471 return;
2472 }
2473
2474 if (blk_bs(blk)) {
2475 error_setg(errp, "There already is a medium in device '%s'", device);
2476 return;
2477 }
2478
2479 blk_insert_bs(blk, bs);
2480
2481 QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list);
2482
2483 if (!blk_dev_has_tray(blk)) {
2484 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2485 * called at all); therefore, the medium needs to be pushed into the
2486 * slot here.
2487 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2488 * value passed here (i.e. true). */
2489 blk_dev_change_media_cb(blk, true);
2490 }
2491 }
2492
2493 void qmp_x_blockdev_insert_medium(const char *device, const char *node_name,
2494 Error **errp)
2495 {
2496 BlockDriverState *bs;
2497
2498 bs = bdrv_find_node(node_name);
2499 if (!bs) {
2500 error_setg(errp, "Node '%s' not found", node_name);
2501 return;
2502 }
2503
2504 if (bs->blk) {
2505 error_setg(errp, "Node '%s' is already in use by '%s'", node_name,
2506 blk_name(bs->blk));
2507 return;
2508 }
2509
2510 qmp_blockdev_insert_anon_medium(device, bs, errp);
2511 }
2512
2513 void qmp_blockdev_change_medium(const char *device, const char *filename,
2514 bool has_format, const char *format,
2515 bool has_read_only,
2516 BlockdevChangeReadOnlyMode read_only,
2517 Error **errp)
2518 {
2519 BlockBackend *blk;
2520 BlockDriverState *medium_bs = NULL;
2521 int bdrv_flags, ret;
2522 QDict *options = NULL;
2523 Error *err = NULL;
2524
2525 blk = blk_by_name(device);
2526 if (!blk) {
2527 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2528 "Device '%s' not found", device);
2529 goto fail;
2530 }
2531
2532 if (blk_bs(blk)) {
2533 blk_update_root_state(blk);
2534 }
2535
2536 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2537 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2538 BDRV_O_PROTOCOL);
2539
2540 if (!has_read_only) {
2541 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2542 }
2543
2544 switch (read_only) {
2545 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2546 break;
2547
2548 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2549 bdrv_flags &= ~BDRV_O_RDWR;
2550 break;
2551
2552 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2553 bdrv_flags |= BDRV_O_RDWR;
2554 break;
2555
2556 default:
2557 abort();
2558 }
2559
2560 if (has_format) {
2561 options = qdict_new();
2562 qdict_put(options, "driver", qstring_from_str(format));
2563 }
2564
2565 assert(!medium_bs);
2566 ret = bdrv_open(&medium_bs, filename, NULL, options, bdrv_flags, errp);
2567 if (ret < 0) {
2568 goto fail;
2569 }
2570
2571 blk_apply_root_state(blk, medium_bs);
2572
2573 bdrv_add_key(medium_bs, NULL, &err);
2574 if (err) {
2575 error_propagate(errp, err);
2576 goto fail;
2577 }
2578
2579 qmp_blockdev_open_tray(device, false, false, &err);
2580 if (err) {
2581 error_propagate(errp, err);
2582 goto fail;
2583 }
2584
2585 qmp_x_blockdev_remove_medium(device, &err);
2586 if (err) {
2587 error_propagate(errp, err);
2588 goto fail;
2589 }
2590
2591 qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
2592 if (err) {
2593 error_propagate(errp, err);
2594 goto fail;
2595 }
2596
2597 qmp_blockdev_close_tray(device, errp);
2598
2599 fail:
2600 /* If the medium has been inserted, the device has its own reference, so
2601 * ours must be relinquished; and if it has not been inserted successfully,
2602 * the reference must be relinquished anyway */
2603 bdrv_unref(medium_bs);
2604 }
2605
2606 /* throttling disk I/O limits */
2607 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2608 int64_t bps_wr,
2609 int64_t iops,
2610 int64_t iops_rd,
2611 int64_t iops_wr,
2612 bool has_bps_max,
2613 int64_t bps_max,
2614 bool has_bps_rd_max,
2615 int64_t bps_rd_max,
2616 bool has_bps_wr_max,
2617 int64_t bps_wr_max,
2618 bool has_iops_max,
2619 int64_t iops_max,
2620 bool has_iops_rd_max,
2621 int64_t iops_rd_max,
2622 bool has_iops_wr_max,
2623 int64_t iops_wr_max,
2624 bool has_bps_max_length,
2625 int64_t bps_max_length,
2626 bool has_bps_rd_max_length,
2627 int64_t bps_rd_max_length,
2628 bool has_bps_wr_max_length,
2629 int64_t bps_wr_max_length,
2630 bool has_iops_max_length,
2631 int64_t iops_max_length,
2632 bool has_iops_rd_max_length,
2633 int64_t iops_rd_max_length,
2634 bool has_iops_wr_max_length,
2635 int64_t iops_wr_max_length,
2636 bool has_iops_size,
2637 int64_t iops_size,
2638 bool has_group,
2639 const char *group, Error **errp)
2640 {
2641 ThrottleConfig cfg;
2642 BlockDriverState *bs;
2643 BlockBackend *blk;
2644 AioContext *aio_context;
2645
2646 blk = blk_by_name(device);
2647 if (!blk) {
2648 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2649 "Device '%s' not found", device);
2650 return;
2651 }
2652
2653 aio_context = blk_get_aio_context(blk);
2654 aio_context_acquire(aio_context);
2655
2656 bs = blk_bs(blk);
2657 if (!bs) {
2658 error_setg(errp, "Device '%s' has no medium", device);
2659 goto out;
2660 }
2661
2662 throttle_config_init(&cfg);
2663 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2664 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2665 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2666
2667 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2668 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2669 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2670
2671 if (has_bps_max) {
2672 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2673 }
2674 if (has_bps_rd_max) {
2675 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2676 }
2677 if (has_bps_wr_max) {
2678 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2679 }
2680 if (has_iops_max) {
2681 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2682 }
2683 if (has_iops_rd_max) {
2684 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2685 }
2686 if (has_iops_wr_max) {
2687 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2688 }
2689
2690 if (has_bps_max_length) {
2691 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = bps_max_length;
2692 }
2693 if (has_bps_rd_max_length) {
2694 cfg.buckets[THROTTLE_BPS_READ].burst_length = bps_rd_max_length;
2695 }
2696 if (has_bps_wr_max_length) {
2697 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = bps_wr_max_length;
2698 }
2699 if (has_iops_max_length) {
2700 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = iops_max_length;
2701 }
2702 if (has_iops_rd_max_length) {
2703 cfg.buckets[THROTTLE_OPS_READ].burst_length = iops_rd_max_length;
2704 }
2705 if (has_iops_wr_max_length) {
2706 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = iops_wr_max_length;
2707 }
2708
2709 if (has_iops_size) {
2710 cfg.op_size = iops_size;
2711 }
2712
2713 if (!throttle_is_valid(&cfg, errp)) {
2714 goto out;
2715 }
2716
2717 if (throttle_enabled(&cfg)) {
2718 /* Enable I/O limits if they're not enabled yet, otherwise
2719 * just update the throttling group. */
2720 if (!bs->throttle_state) {
2721 bdrv_io_limits_enable(bs, has_group ? group : device);
2722 } else if (has_group) {
2723 bdrv_io_limits_update_group(bs, group);
2724 }
2725 /* Set the new throttling configuration */
2726 bdrv_set_io_limits(bs, &cfg);
2727 } else if (bs->throttle_state) {
2728 /* If all throttling settings are set to 0, disable I/O limits */
2729 bdrv_io_limits_disable(bs);
2730 }
2731
2732 out:
2733 aio_context_release(aio_context);
2734 }
2735
2736 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2737 bool has_granularity, uint32_t granularity,
2738 Error **errp)
2739 {
2740 AioContext *aio_context;
2741 BlockDriverState *bs;
2742
2743 if (!name || name[0] == '\0') {
2744 error_setg(errp, "Bitmap name cannot be empty");
2745 return;
2746 }
2747
2748 bs = bdrv_lookup_bs(node, node, errp);
2749 if (!bs) {
2750 return;
2751 }
2752
2753 aio_context = bdrv_get_aio_context(bs);
2754 aio_context_acquire(aio_context);
2755
2756 if (has_granularity) {
2757 if (granularity < 512 || !is_power_of_2(granularity)) {
2758 error_setg(errp, "Granularity must be power of 2 "
2759 "and at least 512");
2760 goto out;
2761 }
2762 } else {
2763 /* Default to cluster size, if available: */
2764 granularity = bdrv_get_default_bitmap_granularity(bs);
2765 }
2766
2767 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2768
2769 out:
2770 aio_context_release(aio_context);
2771 }
2772
2773 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2774 Error **errp)
2775 {
2776 AioContext *aio_context;
2777 BlockDriverState *bs;
2778 BdrvDirtyBitmap *bitmap;
2779
2780 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2781 if (!bitmap || !bs) {
2782 return;
2783 }
2784
2785 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2786 error_setg(errp,
2787 "Bitmap '%s' is currently frozen and cannot be removed",
2788 name);
2789 goto out;
2790 }
2791 bdrv_dirty_bitmap_make_anon(bitmap);
2792 bdrv_release_dirty_bitmap(bs, bitmap);
2793
2794 out:
2795 aio_context_release(aio_context);
2796 }
2797
2798 /**
2799 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2800 * immediately after a full backup operation.
2801 */
2802 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2803 Error **errp)
2804 {
2805 AioContext *aio_context;
2806 BdrvDirtyBitmap *bitmap;
2807 BlockDriverState *bs;
2808
2809 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2810 if (!bitmap || !bs) {
2811 return;
2812 }
2813
2814 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2815 error_setg(errp,
2816 "Bitmap '%s' is currently frozen and cannot be modified",
2817 name);
2818 goto out;
2819 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2820 error_setg(errp,
2821 "Bitmap '%s' is currently disabled and cannot be cleared",
2822 name);
2823 goto out;
2824 }
2825
2826 bdrv_clear_dirty_bitmap(bitmap, NULL);
2827
2828 out:
2829 aio_context_release(aio_context);
2830 }
2831
2832 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2833 {
2834 const char *id = qdict_get_str(qdict, "id");
2835 BlockBackend *blk;
2836 BlockDriverState *bs;
2837 AioContext *aio_context;
2838 Error *local_err = NULL;
2839
2840 bs = bdrv_find_node(id);
2841 if (bs) {
2842 qmp_x_blockdev_del(false, NULL, true, id, &local_err);
2843 if (local_err) {
2844 error_report_err(local_err);
2845 }
2846 return;
2847 }
2848
2849 blk = blk_by_name(id);
2850 if (!blk) {
2851 error_report("Device '%s' not found", id);
2852 return;
2853 }
2854
2855 if (!blk_legacy_dinfo(blk)) {
2856 error_report("Deleting device added with blockdev-add"
2857 " is not supported");
2858 return;
2859 }
2860
2861 aio_context = blk_get_aio_context(blk);
2862 aio_context_acquire(aio_context);
2863
2864 bs = blk_bs(blk);
2865 if (bs) {
2866 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2867 error_report_err(local_err);
2868 aio_context_release(aio_context);
2869 return;
2870 }
2871
2872 blk_remove_bs(blk);
2873 }
2874
2875 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2876 monitor_remove_blk(blk);
2877 if (blk_bs(blk)) {
2878 bdrv_make_anon(blk_bs(blk));
2879 }
2880
2881 /* If this BlockBackend has a device attached to it, its refcount will be
2882 * decremented when the device is removed; otherwise we have to do so here.
2883 */
2884 if (blk_get_attached_dev(blk)) {
2885 /* Further I/O must not pause the guest */
2886 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2887 BLOCKDEV_ON_ERROR_REPORT);
2888 } else {
2889 blk_unref(blk);
2890 }
2891
2892 aio_context_release(aio_context);
2893 }
2894
2895 void qmp_block_resize(bool has_device, const char *device,
2896 bool has_node_name, const char *node_name,
2897 int64_t size, Error **errp)
2898 {
2899 Error *local_err = NULL;
2900 BlockDriverState *bs;
2901 AioContext *aio_context;
2902 int ret;
2903
2904 bs = bdrv_lookup_bs(has_device ? device : NULL,
2905 has_node_name ? node_name : NULL,
2906 &local_err);
2907 if (local_err) {
2908 error_propagate(errp, local_err);
2909 return;
2910 }
2911
2912 aio_context = bdrv_get_aio_context(bs);
2913 aio_context_acquire(aio_context);
2914
2915 if (!bdrv_is_first_non_filter(bs)) {
2916 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2917 goto out;
2918 }
2919
2920 if (size < 0) {
2921 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2922 goto out;
2923 }
2924
2925 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2926 error_setg(errp, QERR_DEVICE_IN_USE, device);
2927 goto out;
2928 }
2929
2930 /* complete all in-flight operations before resizing the device */
2931 bdrv_drain_all();
2932
2933 ret = bdrv_truncate(bs, size);
2934 switch (ret) {
2935 case 0:
2936 break;
2937 case -ENOMEDIUM:
2938 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2939 break;
2940 case -ENOTSUP:
2941 error_setg(errp, QERR_UNSUPPORTED);
2942 break;
2943 case -EACCES:
2944 error_setg(errp, "Device '%s' is read only", device);
2945 break;
2946 case -EBUSY:
2947 error_setg(errp, QERR_DEVICE_IN_USE, device);
2948 break;
2949 default:
2950 error_setg_errno(errp, -ret, "Could not resize");
2951 break;
2952 }
2953
2954 out:
2955 aio_context_release(aio_context);
2956 }
2957
2958 static void block_job_cb(void *opaque, int ret)
2959 {
2960 /* Note that this function may be executed from another AioContext besides
2961 * the QEMU main loop. If you need to access anything that assumes the
2962 * QEMU global mutex, use a BH or introduce a mutex.
2963 */
2964
2965 BlockDriverState *bs = opaque;
2966 const char *msg = NULL;
2967
2968 trace_block_job_cb(bs, bs->job, ret);
2969
2970 assert(bs->job);
2971
2972 if (ret < 0) {
2973 msg = strerror(-ret);
2974 }
2975
2976 if (block_job_is_cancelled(bs->job)) {
2977 block_job_event_cancelled(bs->job);
2978 } else {
2979 block_job_event_completed(bs->job, msg);
2980 }
2981 }
2982
2983 void qmp_block_stream(const char *device,
2984 bool has_base, const char *base,
2985 bool has_backing_file, const char *backing_file,
2986 bool has_speed, int64_t speed,
2987 bool has_on_error, BlockdevOnError on_error,
2988 Error **errp)
2989 {
2990 BlockBackend *blk;
2991 BlockDriverState *bs;
2992 BlockDriverState *base_bs = NULL;
2993 AioContext *aio_context;
2994 Error *local_err = NULL;
2995 const char *base_name = NULL;
2996
2997 if (!has_on_error) {
2998 on_error = BLOCKDEV_ON_ERROR_REPORT;
2999 }
3000
3001 blk = blk_by_name(device);
3002 if (!blk) {
3003 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3004 "Device '%s' not found", device);
3005 return;
3006 }
3007
3008 aio_context = blk_get_aio_context(blk);
3009 aio_context_acquire(aio_context);
3010
3011 if (!blk_is_available(blk)) {
3012 error_setg(errp, "Device '%s' has no medium", device);
3013 goto out;
3014 }
3015 bs = blk_bs(blk);
3016
3017 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
3018 goto out;
3019 }
3020
3021 if (has_base) {
3022 base_bs = bdrv_find_backing_image(bs, base);
3023 if (base_bs == NULL) {
3024 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3025 goto out;
3026 }
3027 assert(bdrv_get_aio_context(base_bs) == aio_context);
3028 base_name = base;
3029 }
3030
3031 /* if we are streaming the entire chain, the result will have no backing
3032 * file, and specifying one is therefore an error */
3033 if (base_bs == NULL && has_backing_file) {
3034 error_setg(errp, "backing file specified, but streaming the "
3035 "entire chain");
3036 goto out;
3037 }
3038
3039 /* backing_file string overrides base bs filename */
3040 base_name = has_backing_file ? backing_file : base_name;
3041
3042 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
3043 on_error, block_job_cb, bs, &local_err);
3044 if (local_err) {
3045 error_propagate(errp, local_err);
3046 goto out;
3047 }
3048
3049 trace_qmp_block_stream(bs, bs->job);
3050
3051 out:
3052 aio_context_release(aio_context);
3053 }
3054
3055 void qmp_block_commit(const char *device,
3056 bool has_base, const char *base,
3057 bool has_top, const char *top,
3058 bool has_backing_file, const char *backing_file,
3059 bool has_speed, int64_t speed,
3060 Error **errp)
3061 {
3062 BlockBackend *blk;
3063 BlockDriverState *bs;
3064 BlockDriverState *base_bs, *top_bs;
3065 AioContext *aio_context;
3066 Error *local_err = NULL;
3067 /* This will be part of the QMP command, if/when the
3068 * BlockdevOnError change for blkmirror makes it in
3069 */
3070 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3071
3072 if (!has_speed) {
3073 speed = 0;
3074 }
3075
3076 /* Important Note:
3077 * libvirt relies on the DeviceNotFound error class in order to probe for
3078 * live commit feature versions; for this to work, we must make sure to
3079 * perform the device lookup before any generic errors that may occur in a
3080 * scenario in which all optional arguments are omitted. */
3081 blk = blk_by_name(device);
3082 if (!blk) {
3083 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3084 "Device '%s' not found", device);
3085 return;
3086 }
3087
3088 aio_context = blk_get_aio_context(blk);
3089 aio_context_acquire(aio_context);
3090
3091 if (!blk_is_available(blk)) {
3092 error_setg(errp, "Device '%s' has no medium", device);
3093 goto out;
3094 }
3095 bs = blk_bs(blk);
3096
3097 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3098 goto out;
3099 }
3100
3101 /* default top_bs is the active layer */
3102 top_bs = bs;
3103
3104 if (has_top && top) {
3105 if (strcmp(bs->filename, top) != 0) {
3106 top_bs = bdrv_find_backing_image(bs, top);
3107 }
3108 }
3109
3110 if (top_bs == NULL) {
3111 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3112 goto out;
3113 }
3114
3115 assert(bdrv_get_aio_context(top_bs) == aio_context);
3116
3117 if (has_base && base) {
3118 base_bs = bdrv_find_backing_image(top_bs, base);
3119 } else {
3120 base_bs = bdrv_find_base(top_bs);
3121 }
3122
3123 if (base_bs == NULL) {
3124 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3125 goto out;
3126 }
3127
3128 assert(bdrv_get_aio_context(base_bs) == aio_context);
3129
3130 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3131 goto out;
3132 }
3133
3134 /* Do not allow attempts to commit an image into itself */
3135 if (top_bs == base_bs) {
3136 error_setg(errp, "cannot commit an image into itself");
3137 goto out;
3138 }
3139
3140 if (top_bs == bs) {
3141 if (has_backing_file) {
3142 error_setg(errp, "'backing-file' specified,"
3143 " but 'top' is the active layer");
3144 goto out;
3145 }
3146 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
3147 bs, &local_err);
3148 } else {
3149 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
3150 has_backing_file ? backing_file : NULL, &local_err);
3151 }
3152 if (local_err != NULL) {
3153 error_propagate(errp, local_err);
3154 goto out;
3155 }
3156
3157 out:
3158 aio_context_release(aio_context);
3159 }
3160
3161 static void do_drive_backup(const char *device, const char *target,
3162 bool has_format, const char *format,
3163 enum MirrorSyncMode sync,
3164 bool has_mode, enum NewImageMode mode,
3165 bool has_speed, int64_t speed,
3166 bool has_bitmap, const char *bitmap,
3167 bool has_on_source_error,
3168 BlockdevOnError on_source_error,
3169 bool has_on_target_error,
3170 BlockdevOnError on_target_error,
3171 BlockJobTxn *txn, Error **errp)
3172 {
3173 BlockBackend *blk;
3174 BlockDriverState *bs;
3175 BlockDriverState *target_bs;
3176 BlockDriverState *source = NULL;
3177 BdrvDirtyBitmap *bmap = NULL;
3178 AioContext *aio_context;
3179 QDict *options = NULL;
3180 Error *local_err = NULL;
3181 int flags;
3182 int64_t size;
3183 int ret;
3184
3185 if (!has_speed) {
3186 speed = 0;
3187 }
3188 if (!has_on_source_error) {
3189 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3190 }
3191 if (!has_on_target_error) {
3192 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3193 }
3194 if (!has_mode) {
3195 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3196 }
3197
3198 blk = blk_by_name(device);
3199 if (!blk) {
3200 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3201 "Device '%s' not found", device);
3202 return;
3203 }
3204
3205 aio_context = blk_get_aio_context(blk);
3206 aio_context_acquire(aio_context);
3207
3208 /* Although backup_run has this check too, we need to use bs->drv below, so
3209 * do an early check redundantly. */
3210 if (!blk_is_available(blk)) {
3211 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3212 goto out;
3213 }
3214 bs = blk_bs(blk);
3215
3216 if (!has_format) {
3217 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3218 }
3219
3220 /* Early check to avoid creating target */
3221 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3222 goto out;
3223 }
3224
3225 flags = bs->open_flags | BDRV_O_RDWR;
3226
3227 /* See if we have a backing HD we can use to create our new image
3228 * on top of. */
3229 if (sync == MIRROR_SYNC_MODE_TOP) {
3230 source = backing_bs(bs);
3231 if (!source) {
3232 sync = MIRROR_SYNC_MODE_FULL;
3233 }
3234 }
3235 if (sync == MIRROR_SYNC_MODE_NONE) {
3236 source = bs;
3237 }
3238
3239 size = bdrv_getlength(bs);
3240 if (size < 0) {
3241 error_setg_errno(errp, -size, "bdrv_getlength failed");
3242 goto out;
3243 }
3244
3245 if (mode != NEW_IMAGE_MODE_EXISTING) {
3246 assert(format);
3247 if (source) {
3248 bdrv_img_create(target, format, source->filename,
3249 source->drv->format_name, NULL,
3250 size, flags, &local_err, false);
3251 } else {
3252 bdrv_img_create(target, format, NULL, NULL, NULL,
3253 size, flags, &local_err, false);
3254 }
3255 }
3256
3257 if (local_err) {
3258 error_propagate(errp, local_err);
3259 goto out;
3260 }
3261
3262 if (format) {
3263 options = qdict_new();
3264 qdict_put(options, "driver", qstring_from_str(format));
3265 }
3266
3267 target_bs = NULL;
3268 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
3269 if (ret < 0) {
3270 error_propagate(errp, local_err);
3271 goto out;
3272 }
3273
3274 bdrv_set_aio_context(target_bs, aio_context);
3275
3276 if (has_bitmap) {
3277 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
3278 if (!bmap) {
3279 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
3280 bdrv_unref(target_bs);
3281 goto out;
3282 }
3283 }
3284
3285 backup_start(bs, target_bs, speed, sync, bmap,
3286 on_source_error, on_target_error,
3287 block_job_cb, bs, txn, &local_err);
3288 if (local_err != NULL) {
3289 bdrv_unref(target_bs);
3290 error_propagate(errp, local_err);
3291 goto out;
3292 }
3293
3294 out:
3295 aio_context_release(aio_context);
3296 }
3297
3298 void qmp_drive_backup(const char *device, const char *target,
3299 bool has_format, const char *format,
3300 enum MirrorSyncMode sync,
3301 bool has_mode, enum NewImageMode mode,
3302 bool has_speed, int64_t speed,
3303 bool has_bitmap, const char *bitmap,
3304 bool has_on_source_error, BlockdevOnError on_source_error,
3305 bool has_on_target_error, BlockdevOnError on_target_error,
3306 Error **errp)
3307 {
3308 return do_drive_backup(device, target, has_format, format, sync,
3309 has_mode, mode, has_speed, speed,
3310 has_bitmap, bitmap,
3311 has_on_source_error, on_source_error,
3312 has_on_target_error, on_target_error,
3313 NULL, errp);
3314 }
3315
3316 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3317 {
3318 return bdrv_named_nodes_list(errp);
3319 }
3320
3321 void do_blockdev_backup(const char *device, const char *target,
3322 enum MirrorSyncMode sync,
3323 bool has_speed, int64_t speed,
3324 bool has_on_source_error,
3325 BlockdevOnError on_source_error,
3326 bool has_on_target_error,
3327 BlockdevOnError on_target_error,
3328 BlockJobTxn *txn, Error **errp)
3329 {
3330 BlockBackend *blk, *target_blk;
3331 BlockDriverState *bs;
3332 BlockDriverState *target_bs;
3333 Error *local_err = NULL;
3334 AioContext *aio_context;
3335
3336 if (!has_speed) {
3337 speed = 0;
3338 }
3339 if (!has_on_source_error) {
3340 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3341 }
3342 if (!has_on_target_error) {
3343 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3344 }
3345
3346 blk = blk_by_name(device);
3347 if (!blk) {
3348 error_setg(errp, "Device '%s' not found", device);
3349 return;
3350 }
3351
3352 aio_context = blk_get_aio_context(blk);
3353 aio_context_acquire(aio_context);
3354
3355 if (!blk_is_available(blk)) {
3356 error_setg(errp, "Device '%s' has no medium", device);
3357 goto out;
3358 }
3359 bs = blk_bs(blk);
3360
3361 target_blk = blk_by_name(target);
3362 if (!target_blk) {
3363 error_setg(errp, "Device '%s' not found", target);
3364 goto out;
3365 }
3366
3367 if (!blk_is_available(target_blk)) {
3368 error_setg(errp, "Device '%s' has no medium", target);
3369 goto out;
3370 }
3371 target_bs = blk_bs(target_blk);
3372
3373 bdrv_ref(target_bs);
3374 bdrv_set_aio_context(target_bs, aio_context);
3375 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
3376 on_target_error, block_job_cb, bs, txn, &local_err);
3377 if (local_err != NULL) {
3378 bdrv_unref(target_bs);
3379 error_propagate(errp, local_err);
3380 }
3381 out:
3382 aio_context_release(aio_context);
3383 }
3384
3385 void qmp_blockdev_backup(const char *device, const char *target,
3386 enum MirrorSyncMode sync,
3387 bool has_speed, int64_t speed,
3388 bool has_on_source_error,
3389 BlockdevOnError on_source_error,
3390 bool has_on_target_error,
3391 BlockdevOnError on_target_error,
3392 Error **errp)
3393 {
3394 do_blockdev_backup(device, target, sync, has_speed, speed,
3395 has_on_source_error, on_source_error,
3396 has_on_target_error, on_target_error,
3397 NULL, errp);
3398 }
3399
3400 /* Parameter check and block job starting for drive mirroring.
3401 * Caller should hold @device and @target's aio context (must be the same).
3402 **/
3403 static void blockdev_mirror_common(BlockDriverState *bs,
3404 BlockDriverState *target,
3405 bool has_replaces, const char *replaces,
3406 enum MirrorSyncMode sync,
3407 bool has_speed, int64_t speed,
3408 bool has_granularity, uint32_t granularity,
3409 bool has_buf_size, int64_t buf_size,
3410 bool has_on_source_error,
3411 BlockdevOnError on_source_error,
3412 bool has_on_target_error,
3413 BlockdevOnError on_target_error,
3414 bool has_unmap, bool unmap,
3415 Error **errp)
3416 {
3417
3418 if (!has_speed) {
3419 speed = 0;
3420 }
3421 if (!has_on_source_error) {
3422 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3423 }
3424 if (!has_on_target_error) {
3425 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3426 }
3427 if (!has_granularity) {
3428 granularity = 0;
3429 }
3430 if (!has_buf_size) {
3431 buf_size = 0;
3432 }
3433 if (!has_unmap) {
3434 unmap = true;
3435 }
3436
3437 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3438 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3439 "a value in range [512B, 64MB]");
3440 return;
3441 }
3442 if (granularity & (granularity - 1)) {
3443 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3444 "power of 2");
3445 return;
3446 }
3447
3448 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3449 return;
3450 }
3451 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3452 return;
3453 }
3454 if (target->blk) {
3455 error_setg(errp, "Cannot mirror to an attached block device");
3456 return;
3457 }
3458
3459 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3460 sync = MIRROR_SYNC_MODE_FULL;
3461 }
3462
3463 /* pass the node name to replace to mirror start since it's loose coupling
3464 * and will allow to check whether the node still exist at mirror completion
3465 */
3466 mirror_start(bs, target,
3467 has_replaces ? replaces : NULL,
3468 speed, granularity, buf_size, sync,
3469 on_source_error, on_target_error, unmap,
3470 block_job_cb, bs, errp);
3471 }
3472
3473 void qmp_drive_mirror(const char *device, const char *target,
3474 bool has_format, const char *format,
3475 bool has_node_name, const char *node_name,
3476 bool has_replaces, const char *replaces,
3477 enum MirrorSyncMode sync,
3478 bool has_mode, enum NewImageMode mode,
3479 bool has_speed, int64_t speed,
3480 bool has_granularity, uint32_t granularity,
3481 bool has_buf_size, int64_t buf_size,
3482 bool has_on_source_error, BlockdevOnError on_source_error,
3483 bool has_on_target_error, BlockdevOnError on_target_error,
3484 bool has_unmap, bool unmap,
3485 Error **errp)
3486 {
3487 BlockDriverState *bs;
3488 BlockBackend *blk;
3489 BlockDriverState *source, *target_bs;
3490 AioContext *aio_context;
3491 Error *local_err = NULL;
3492 QDict *options = NULL;
3493 int flags;
3494 int64_t size;
3495 int ret;
3496
3497 blk = blk_by_name(device);
3498 if (!blk) {
3499 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3500 "Device '%s' not found", device);
3501 return;
3502 }
3503
3504 aio_context = blk_get_aio_context(blk);
3505 aio_context_acquire(aio_context);
3506
3507 if (!blk_is_available(blk)) {
3508 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3509 goto out;
3510 }
3511 bs = blk_bs(blk);
3512 if (!has_mode) {
3513 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3514 }
3515
3516 if (!has_format) {
3517 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3518 }
3519
3520 flags = bs->open_flags | BDRV_O_RDWR;
3521 source = backing_bs(bs);
3522 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3523 sync = MIRROR_SYNC_MODE_FULL;
3524 }
3525 if (sync == MIRROR_SYNC_MODE_NONE) {
3526 source = bs;
3527 }
3528
3529 size = bdrv_getlength(bs);
3530 if (size < 0) {
3531 error_setg_errno(errp, -size, "bdrv_getlength failed");
3532 goto out;
3533 }
3534
3535 if (has_replaces) {
3536 BlockDriverState *to_replace_bs;
3537 AioContext *replace_aio_context;
3538 int64_t replace_size;
3539
3540 if (!has_node_name) {
3541 error_setg(errp, "a node-name must be provided when replacing a"
3542 " named node of the graph");
3543 goto out;
3544 }
3545
3546 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3547
3548 if (!to_replace_bs) {
3549 error_propagate(errp, local_err);
3550 goto out;
3551 }
3552
3553 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3554 aio_context_acquire(replace_aio_context);
3555 replace_size = bdrv_getlength(to_replace_bs);
3556 aio_context_release(replace_aio_context);
3557
3558 if (size != replace_size) {
3559 error_setg(errp, "cannot replace image with a mirror image of "
3560 "different size");
3561 goto out;
3562 }
3563 }
3564
3565 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3566 && mode != NEW_IMAGE_MODE_EXISTING)
3567 {
3568 /* create new image w/o backing file */
3569 assert(format);
3570 bdrv_img_create(target, format,
3571 NULL, NULL, NULL, size, flags, &local_err, false);
3572 } else {
3573 switch (mode) {
3574 case NEW_IMAGE_MODE_EXISTING:
3575 break;
3576 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3577 /* create new image with backing file */
3578 bdrv_img_create(target, format,
3579 source->filename,
3580 source->drv->format_name,
3581 NULL, size, flags, &local_err, false);
3582 break;
3583 default:
3584 abort();
3585 }
3586 }
3587
3588 if (local_err) {
3589 error_propagate(errp, local_err);
3590 goto out;
3591 }
3592
3593 options = qdict_new();
3594 if (has_node_name) {
3595 qdict_put(options, "node-name", qstring_from_str(node_name));
3596 }
3597 if (format) {
3598 qdict_put(options, "driver", qstring_from_str(format));
3599 }
3600
3601 /* Mirroring takes care of copy-on-write using the source's backing
3602 * file.
3603 */
3604 target_bs = NULL;
3605 ret = bdrv_open(&target_bs, target, NULL, options,
3606 flags | BDRV_O_NO_BACKING, &local_err);
3607 if (ret < 0) {
3608 error_propagate(errp, local_err);
3609 goto out;
3610 }
3611
3612 bdrv_set_aio_context(target_bs, aio_context);
3613
3614 blockdev_mirror_common(bs, target_bs,
3615 has_replaces, replaces, sync,
3616 has_speed, speed,
3617 has_granularity, granularity,
3618 has_buf_size, buf_size,
3619 has_on_source_error, on_source_error,
3620 has_on_target_error, on_target_error,
3621 has_unmap, unmap,
3622 &local_err);
3623 if (local_err) {
3624 error_propagate(errp, local_err);
3625 bdrv_unref(target_bs);
3626 }
3627 out:
3628 aio_context_release(aio_context);
3629 }
3630
3631 void qmp_blockdev_mirror(const char *device, const char *target,
3632 bool has_replaces, const char *replaces,
3633 MirrorSyncMode sync,
3634 bool has_speed, int64_t speed,
3635 bool has_granularity, uint32_t granularity,
3636 bool has_buf_size, int64_t buf_size,
3637 bool has_on_source_error,
3638 BlockdevOnError on_source_error,
3639 bool has_on_target_error,
3640 BlockdevOnError on_target_error,
3641 Error **errp)
3642 {
3643 BlockDriverState *bs;
3644 BlockBackend *blk;
3645 BlockDriverState *target_bs;
3646 AioContext *aio_context;
3647 Error *local_err = NULL;
3648
3649 blk = blk_by_name(device);
3650 if (!blk) {
3651 error_setg(errp, "Device '%s' not found", device);
3652 return;
3653 }
3654 bs = blk_bs(blk);
3655
3656 if (!bs) {
3657 error_setg(errp, "Device '%s' has no media", device);
3658 return;
3659 }
3660
3661 target_bs = bdrv_lookup_bs(target, target, errp);
3662 if (!target_bs) {
3663 return;
3664 }
3665
3666 aio_context = bdrv_get_aio_context(bs);
3667 aio_context_acquire(aio_context);
3668
3669 bdrv_ref(target_bs);
3670 bdrv_set_aio_context(target_bs, aio_context);
3671
3672 blockdev_mirror_common(bs, target_bs,
3673 has_replaces, replaces, sync,
3674 has_speed, speed,
3675 has_granularity, granularity,
3676 has_buf_size, buf_size,
3677 has_on_source_error, on_source_error,
3678 has_on_target_error, on_target_error,
3679 true, true,
3680 &local_err);
3681 if (local_err) {
3682 error_propagate(errp, local_err);
3683 bdrv_unref(target_bs);
3684 }
3685
3686 aio_context_release(aio_context);
3687 }
3688
3689 /* Get the block job for a given device name and acquire its AioContext */
3690 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3691 Error **errp)
3692 {
3693 BlockBackend *blk;
3694 BlockDriverState *bs;
3695
3696 *aio_context = NULL;
3697
3698 blk = blk_by_name(device);
3699 if (!blk) {
3700 goto notfound;
3701 }
3702
3703 *aio_context = blk_get_aio_context(blk);
3704 aio_context_acquire(*aio_context);
3705
3706 if (!blk_is_available(blk)) {
3707 goto notfound;
3708 }
3709 bs = blk_bs(blk);
3710
3711 if (!bs->job) {
3712 goto notfound;
3713 }
3714
3715 return bs->job;
3716
3717 notfound:
3718 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3719 "No active block job on device '%s'", device);
3720 if (*aio_context) {
3721 aio_context_release(*aio_context);
3722 *aio_context = NULL;
3723 }
3724 return NULL;
3725 }
3726
3727 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3728 {
3729 AioContext *aio_context;
3730 BlockJob *job = find_block_job(device, &aio_context, errp);
3731
3732 if (!job) {
3733 return;
3734 }
3735
3736 block_job_set_speed(job, speed, errp);
3737 aio_context_release(aio_context);
3738 }
3739
3740 void qmp_block_job_cancel(const char *device,
3741 bool has_force, bool force, Error **errp)
3742 {
3743 AioContext *aio_context;
3744 BlockJob *job = find_block_job(device, &aio_context, errp);
3745
3746 if (!job) {
3747 return;
3748 }
3749
3750 if (!has_force) {
3751 force = false;
3752 }
3753
3754 if (job->user_paused && !force) {
3755 error_setg(errp, "The block job for device '%s' is currently paused",
3756 device);
3757 goto out;
3758 }
3759
3760 trace_qmp_block_job_cancel(job);
3761 block_job_cancel(job);
3762 out:
3763 aio_context_release(aio_context);
3764 }
3765
3766 void qmp_block_job_pause(const char *device, Error **errp)
3767 {
3768 AioContext *aio_context;
3769 BlockJob *job = find_block_job(device, &aio_context, errp);
3770
3771 if (!job || job->user_paused) {
3772 return;
3773 }
3774
3775 job->user_paused = true;
3776 trace_qmp_block_job_pause(job);
3777 block_job_pause(job);
3778 aio_context_release(aio_context);
3779 }
3780
3781 void qmp_block_job_resume(const char *device, Error **errp)
3782 {
3783 AioContext *aio_context;
3784 BlockJob *job = find_block_job(device, &aio_context, errp);
3785
3786 if (!job || !job->user_paused) {
3787 return;
3788 }
3789
3790 job->user_paused = false;
3791 trace_qmp_block_job_resume(job);
3792 block_job_resume(job);
3793 aio_context_release(aio_context);
3794 }
3795
3796 void qmp_block_job_complete(const char *device, Error **errp)
3797 {
3798 AioContext *aio_context;
3799 BlockJob *job = find_block_job(device, &aio_context, errp);
3800
3801 if (!job) {
3802 return;
3803 }
3804
3805 trace_qmp_block_job_complete(job);
3806 block_job_complete(job, errp);
3807 aio_context_release(aio_context);
3808 }
3809
3810 void qmp_change_backing_file(const char *device,
3811 const char *image_node_name,
3812 const char *backing_file,
3813 Error **errp)
3814 {
3815 BlockBackend *blk;
3816 BlockDriverState *bs = NULL;
3817 AioContext *aio_context;
3818 BlockDriverState *image_bs = NULL;
3819 Error *local_err = NULL;
3820 bool ro;
3821 int open_flags;
3822 int ret;
3823
3824 blk = blk_by_name(device);
3825 if (!blk) {
3826 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3827 "Device '%s' not found", device);
3828 return;
3829 }
3830
3831 aio_context = blk_get_aio_context(blk);
3832 aio_context_acquire(aio_context);
3833
3834 if (!blk_is_available(blk)) {
3835 error_setg(errp, "Device '%s' has no medium", device);
3836 goto out;
3837 }
3838 bs = blk_bs(blk);
3839
3840 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3841 if (local_err) {
3842 error_propagate(errp, local_err);
3843 goto out;
3844 }
3845
3846 if (!image_bs) {
3847 error_setg(errp, "image file not found");
3848 goto out;
3849 }
3850
3851 if (bdrv_find_base(image_bs) == image_bs) {
3852 error_setg(errp, "not allowing backing file change on an image "
3853 "without a backing file");
3854 goto out;
3855 }
3856
3857 /* even though we are not necessarily operating on bs, we need it to
3858 * determine if block ops are currently prohibited on the chain */
3859 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3860 goto out;
3861 }
3862
3863 /* final sanity check */
3864 if (!bdrv_chain_contains(bs, image_bs)) {
3865 error_setg(errp, "'%s' and image file are not in the same chain",
3866 device);
3867 goto out;
3868 }
3869
3870 /* if not r/w, reopen to make r/w */
3871 open_flags = image_bs->open_flags;
3872 ro = bdrv_is_read_only(image_bs);
3873
3874 if (ro) {
3875 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3876 if (local_err) {
3877 error_propagate(errp, local_err);
3878 goto out;
3879 }
3880 }
3881
3882 ret = bdrv_change_backing_file(image_bs, backing_file,
3883 image_bs->drv ? image_bs->drv->format_name : "");
3884
3885 if (ret < 0) {
3886 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3887 backing_file);
3888 /* don't exit here, so we can try to restore open flags if
3889 * appropriate */
3890 }
3891
3892 if (ro) {
3893 bdrv_reopen(image_bs, open_flags, &local_err);
3894 if (local_err) {
3895 error_propagate(errp, local_err); /* will preserve prior errp */
3896 }
3897 }
3898
3899 out:
3900 aio_context_release(aio_context);
3901 }
3902
3903 void hmp_drive_add_node(Monitor *mon, const char *optstr)
3904 {
3905 QemuOpts *opts;
3906 QDict *qdict;
3907 Error *local_err = NULL;
3908
3909 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
3910 if (!opts) {
3911 return;
3912 }
3913
3914 qdict = qemu_opts_to_qdict(opts, NULL);
3915
3916 if (!qdict_get_try_str(qdict, "node-name")) {
3917 QDECREF(qdict);
3918 error_report("'node-name' needs to be specified");
3919 goto out;
3920 }
3921
3922 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
3923 if (!bs) {
3924 error_report_err(local_err);
3925 goto out;
3926 }
3927
3928 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3929
3930 out:
3931 qemu_opts_del(opts);
3932 }
3933
3934 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3935 {
3936 QmpOutputVisitor *ov = qmp_output_visitor_new();
3937 BlockDriverState *bs;
3938 BlockBackend *blk = NULL;
3939 QObject *obj;
3940 QDict *qdict;
3941 Error *local_err = NULL;
3942
3943 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3944 * cache.direct=false instead of silently switching to aio=threads, except
3945 * when called from drive_new().
3946 *
3947 * For now, simply forbidding the combination for all drivers will do. */
3948 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3949 bool direct = options->has_cache &&
3950 options->cache->has_direct &&
3951 options->cache->direct;
3952 if (!direct) {
3953 error_setg(errp, "aio=native requires cache.direct=true");
3954 goto fail;
3955 }
3956 }
3957
3958 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), NULL, &options,
3959 &local_err);
3960 if (local_err) {
3961 error_propagate(errp, local_err);
3962 goto fail;
3963 }
3964
3965 obj = qmp_output_get_qobject(ov);
3966 qdict = qobject_to_qdict(obj);
3967
3968 qdict_flatten(qdict);
3969
3970 if (options->has_id) {
3971 blk = blockdev_init(NULL, qdict, &local_err);
3972 if (local_err) {
3973 error_propagate(errp, local_err);
3974 goto fail;
3975 }
3976
3977 bs = blk_bs(blk);
3978 } else {
3979 if (!qdict_get_try_str(qdict, "node-name")) {
3980 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3981 "the root node");
3982 goto fail;
3983 }
3984
3985 bs = bds_tree_init(qdict, errp);
3986 if (!bs) {
3987 goto fail;
3988 }
3989
3990 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3991 }
3992
3993 if (bs && bdrv_key_required(bs)) {
3994 if (blk) {
3995 monitor_remove_blk(blk);
3996 blk_unref(blk);
3997 } else {
3998 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3999 bdrv_unref(bs);
4000 }
4001 error_setg(errp, "blockdev-add doesn't support encrypted devices");
4002 goto fail;
4003 }
4004
4005 fail:
4006 qmp_output_visitor_cleanup(ov);
4007 }
4008
4009 void qmp_x_blockdev_del(bool has_id, const char *id,
4010 bool has_node_name, const char *node_name, Error **errp)
4011 {
4012 AioContext *aio_context;
4013 BlockBackend *blk;
4014 BlockDriverState *bs;
4015
4016 if (has_id && has_node_name) {
4017 error_setg(errp, "Only one of id and node-name must be specified");
4018 return;
4019 } else if (!has_id && !has_node_name) {
4020 error_setg(errp, "No block device specified");
4021 return;
4022 }
4023
4024 if (has_id) {
4025 /* blk_by_name() never returns a BB that is not owned by the monitor */
4026 blk = blk_by_name(id);
4027 if (!blk) {
4028 error_setg(errp, "Cannot find block backend %s", id);
4029 return;
4030 }
4031 if (blk_get_refcnt(blk) > 1) {
4032 error_setg(errp, "Block backend %s is in use", id);
4033 return;
4034 }
4035 bs = blk_bs(blk);
4036 aio_context = blk_get_aio_context(blk);
4037 } else {
4038 bs = bdrv_find_node(node_name);
4039 if (!bs) {
4040 error_setg(errp, "Cannot find node %s", node_name);
4041 return;
4042 }
4043 blk = bs->blk;
4044 if (blk) {
4045 error_setg(errp, "Node %s is in use by %s",
4046 node_name, blk_name(blk));
4047 return;
4048 }
4049 aio_context = bdrv_get_aio_context(bs);
4050 }
4051
4052 aio_context_acquire(aio_context);
4053
4054 if (bs) {
4055 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4056 goto out;
4057 }
4058
4059 if (!blk && !bs->monitor_list.tqe_prev) {
4060 error_setg(errp, "Node %s is not owned by the monitor",
4061 bs->node_name);
4062 goto out;
4063 }
4064
4065 if (bs->refcnt > 1) {
4066 error_setg(errp, "Block device %s is in use",
4067 bdrv_get_device_or_node_name(bs));
4068 goto out;
4069 }
4070 }
4071
4072 if (blk) {
4073 monitor_remove_blk(blk);
4074 blk_unref(blk);
4075 } else {
4076 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4077 bdrv_unref(bs);
4078 }
4079
4080 out:
4081 aio_context_release(aio_context);
4082 }
4083
4084 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4085 {
4086 BlockJobInfoList *head = NULL, **p_next = &head;
4087 BlockDriverState *bs;
4088
4089 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
4090 AioContext *aio_context = bdrv_get_aio_context(bs);
4091
4092 aio_context_acquire(aio_context);
4093
4094 if (bs->job) {
4095 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
4096 elem->value = block_job_query(bs->job);
4097 *p_next = elem;
4098 p_next = &elem->next;
4099 }
4100
4101 aio_context_release(aio_context);
4102 }
4103
4104 return head;
4105 }
4106
4107 QemuOptsList qemu_common_drive_opts = {
4108 .name = "drive",
4109 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4110 .desc = {
4111 {
4112 .name = "snapshot",
4113 .type = QEMU_OPT_BOOL,
4114 .help = "enable/disable snapshot mode",
4115 },{
4116 .name = "discard",
4117 .type = QEMU_OPT_STRING,
4118 .help = "discard operation (ignore/off, unmap/on)",
4119 },{
4120 .name = "aio",
4121 .type = QEMU_OPT_STRING,
4122 .help = "host AIO implementation (threads, native)",
4123 },{
4124 .name = "format",
4125 .type = QEMU_OPT_STRING,
4126 .help = "disk format (raw, qcow2, ...)",
4127 },{
4128 .name = "rerror",
4129 .type = QEMU_OPT_STRING,
4130 .help = "read error action",
4131 },{
4132 .name = "werror",
4133 .type = QEMU_OPT_STRING,
4134 .help = "write error action",
4135 },{
4136 .name = "read-only",
4137 .type = QEMU_OPT_BOOL,
4138 .help = "open drive file as read-only",
4139 },{
4140 .name = "throttling.iops-total",
4141 .type = QEMU_OPT_NUMBER,
4142 .help = "limit total I/O operations per second",
4143 },{
4144 .name = "throttling.iops-read",
4145 .type = QEMU_OPT_NUMBER,
4146 .help = "limit read operations per second",
4147 },{
4148 .name = "throttling.iops-write",
4149 .type = QEMU_OPT_NUMBER,
4150 .help = "limit write operations per second",
4151 },{
4152 .name = "throttling.bps-total",
4153 .type = QEMU_OPT_NUMBER,
4154 .help = "limit total bytes per second",
4155 },{
4156 .name = "throttling.bps-read",
4157 .type = QEMU_OPT_NUMBER,
4158 .help = "limit read bytes per second",
4159 },{
4160 .name = "throttling.bps-write",
4161 .type = QEMU_OPT_NUMBER,
4162 .help = "limit write bytes per second",
4163 },{
4164 .name = "throttling.iops-total-max",
4165 .type = QEMU_OPT_NUMBER,
4166 .help = "I/O operations burst",
4167 },{
4168 .name = "throttling.iops-read-max",
4169 .type = QEMU_OPT_NUMBER,
4170 .help = "I/O operations read burst",
4171 },{
4172 .name = "throttling.iops-write-max",
4173 .type = QEMU_OPT_NUMBER,
4174 .help = "I/O operations write burst",
4175 },{
4176 .name = "throttling.bps-total-max",
4177 .type = QEMU_OPT_NUMBER,
4178 .help = "total bytes burst",
4179 },{
4180 .name = "throttling.bps-read-max",
4181 .type = QEMU_OPT_NUMBER,
4182 .help = "total bytes read burst",
4183 },{
4184 .name = "throttling.bps-write-max",
4185 .type = QEMU_OPT_NUMBER,
4186 .help = "total bytes write burst",
4187 },{
4188 .name = "throttling.iops-total-max-length",
4189 .type = QEMU_OPT_NUMBER,
4190 .help = "length of the iops-total-max burst period, in seconds",
4191 },{
4192 .name = "throttling.iops-read-max-length",
4193 .type = QEMU_OPT_NUMBER,
4194 .help = "length of the iops-read-max burst period, in seconds",
4195 },{
4196 .name = "throttling.iops-write-max-length",
4197 .type = QEMU_OPT_NUMBER,
4198 .help = "length of the iops-write-max burst period, in seconds",
4199 },{
4200 .name = "throttling.bps-total-max-length",
4201 .type = QEMU_OPT_NUMBER,
4202 .help = "length of the bps-total-max burst period, in seconds",
4203 },{
4204 .name = "throttling.bps-read-max-length",
4205 .type = QEMU_OPT_NUMBER,
4206 .help = "length of the bps-read-max burst period, in seconds",
4207 },{
4208 .name = "throttling.bps-write-max-length",
4209 .type = QEMU_OPT_NUMBER,
4210 .help = "length of the bps-write-max burst period, in seconds",
4211 },{
4212 .name = "throttling.iops-size",
4213 .type = QEMU_OPT_NUMBER,
4214 .help = "when limiting by iops max size of an I/O in bytes",
4215 },{
4216 .name = "throttling.group",
4217 .type = QEMU_OPT_STRING,
4218 .help = "name of the block throttling group",
4219 },{
4220 .name = "copy-on-read",
4221 .type = QEMU_OPT_BOOL,
4222 .help = "copy read data from backing file into image file",
4223 },{
4224 .name = "detect-zeroes",
4225 .type = QEMU_OPT_STRING,
4226 .help = "try to optimize zero writes (off, on, unmap)",
4227 },{
4228 .name = "stats-account-invalid",
4229 .type = QEMU_OPT_BOOL,
4230 .help = "whether to account for invalid I/O operations "
4231 "in the statistics",
4232 },{
4233 .name = "stats-account-failed",
4234 .type = QEMU_OPT_BOOL,
4235 .help = "whether to account for failed I/O operations "
4236 "in the statistics",
4237 },
4238 { /* end of list */ }
4239 },
4240 };
4241
4242 static QemuOptsList qemu_root_bds_opts = {
4243 .name = "root-bds",
4244 .head = QTAILQ_HEAD_INITIALIZER(qemu_root_bds_opts.head),
4245 .desc = {
4246 {
4247 .name = "discard",
4248 .type = QEMU_OPT_STRING,
4249 .help = "discard operation (ignore/off, unmap/on)",
4250 },{
4251 .name = "aio",
4252 .type = QEMU_OPT_STRING,
4253 .help = "host AIO implementation (threads, native)",
4254 },{
4255 .name = "read-only",
4256 .type = QEMU_OPT_BOOL,
4257 .help = "open drive file as read-only",
4258 },{
4259 .name = "copy-on-read",
4260 .type = QEMU_OPT_BOOL,
4261 .help = "copy read data from backing file into image file",
4262 },{
4263 .name = "detect-zeroes",
4264 .type = QEMU_OPT_STRING,
4265 .help = "try to optimize zero writes (off, on, unmap)",
4266 },
4267 { /* end of list */ }
4268 },
4269 };
4270
4271 QemuOptsList qemu_drive_opts = {
4272 .name = "drive",
4273 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4274 .desc = {
4275 /*
4276 * no elements => accept any params
4277 * validation will happen later
4278 */
4279 { /* end of list */ }
4280 },
4281 };
AR7 emulation for QEMU