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block: Remove unused typedef of BlockDriverDirtyHandler
[qemu/ar7.git] / blockdev.c
blob322ca03908fda628945a1ab2a16d8f75fa619151
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 blk_unref(blk);
151 }
152 }
153
154 /**
155 * Returns the current mapping of how many units per bus
156 * a particular interface can support.
157 *
158 * A positive integer indicates n units per bus.
159 * 0 implies the mapping has not been established.
160 * -1 indicates an invalid BlockInterfaceType was given.
161 */
162 int drive_get_max_devs(BlockInterfaceType type)
163 {
164 if (type >= IF_IDE && type < IF_COUNT) {
165 return if_max_devs[type];
166 }
167
168 return -1;
169 }
170
171 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
172 {
173 int max_devs = if_max_devs[type];
174 return max_devs ? index / max_devs : 0;
175 }
176
177 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
178 {
179 int max_devs = if_max_devs[type];
180 return max_devs ? index % max_devs : index;
181 }
182
183 QemuOpts *drive_def(const char *optstr)
184 {
185 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
186 }
187
188 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
189 const char *optstr)
190 {
191 QemuOpts *opts;
192
193 opts = drive_def(optstr);
194 if (!opts) {
195 return NULL;
196 }
197 if (type != IF_DEFAULT) {
198 qemu_opt_set(opts, "if", if_name[type], &error_abort);
199 }
200 if (index >= 0) {
201 qemu_opt_set_number(opts, "index", index, &error_abort);
202 }
203 if (file)
204 qemu_opt_set(opts, "file", file, &error_abort);
205 return opts;
206 }
207
208 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
209 {
210 BlockBackend *blk;
211 DriveInfo *dinfo;
212
213 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
214 dinfo = blk_legacy_dinfo(blk);
215 if (dinfo && dinfo->type == type
216 && dinfo->bus == bus && dinfo->unit == unit) {
217 return dinfo;
218 }
219 }
220
221 return NULL;
222 }
223
224 bool drive_check_orphaned(void)
225 {
226 BlockBackend *blk;
227 DriveInfo *dinfo;
228 bool rs = false;
229
230 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
231 dinfo = blk_legacy_dinfo(blk);
232 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
233 /* Unless this is a default drive, this may be an oversight. */
234 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
235 dinfo->type != IF_NONE) {
236 fprintf(stderr, "Warning: Orphaned drive without device: "
237 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
238 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
239 if_name[dinfo->type], dinfo->bus, dinfo->unit);
240 rs = true;
241 }
242 }
243
244 return rs;
245 }
246
247 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
248 {
249 return drive_get(type,
250 drive_index_to_bus_id(type, index),
251 drive_index_to_unit_id(type, index));
252 }
253
254 int drive_get_max_bus(BlockInterfaceType type)
255 {
256 int max_bus;
257 BlockBackend *blk;
258 DriveInfo *dinfo;
259
260 max_bus = -1;
261 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
262 dinfo = blk_legacy_dinfo(blk);
263 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
264 max_bus = dinfo->bus;
265 }
266 }
267 return max_bus;
268 }
269
270 /* Get a block device. This should only be used for single-drive devices
271 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
272 appropriate bus. */
273 DriveInfo *drive_get_next(BlockInterfaceType type)
274 {
275 static int next_block_unit[IF_COUNT];
276
277 return drive_get(type, 0, next_block_unit[type]++);
278 }
279
280 static void bdrv_format_print(void *opaque, const char *name)
281 {
282 error_printf(" %s", name);
283 }
284
285 typedef struct {
286 QEMUBH *bh;
287 BlockDriverState *bs;
288 } BDRVPutRefBH;
289
290 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
291 {
292 if (!strcmp(buf, "ignore")) {
293 return BLOCKDEV_ON_ERROR_IGNORE;
294 } else if (!is_read && !strcmp(buf, "enospc")) {
295 return BLOCKDEV_ON_ERROR_ENOSPC;
296 } else if (!strcmp(buf, "stop")) {
297 return BLOCKDEV_ON_ERROR_STOP;
298 } else if (!strcmp(buf, "report")) {
299 return BLOCKDEV_ON_ERROR_REPORT;
300 } else {
301 error_setg(errp, "'%s' invalid %s error action",
302 buf, is_read ? "read" : "write");
303 return -1;
304 }
305 }
306
307 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
308 Error **errp)
309 {
310 const QListEntry *entry;
311 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
312 switch (qobject_type(entry->value)) {
313
314 case QTYPE_QSTRING: {
315 unsigned long long length;
316 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
317 if (parse_uint_full(str, &length, 10) == 0 &&
318 length > 0 && length <= UINT_MAX) {
319 block_acct_add_interval(stats, (unsigned) length);
320 } else {
321 error_setg(errp, "Invalid interval length: %s", str);
322 return false;
323 }
324 break;
325 }
326
327 case QTYPE_QINT: {
328 int64_t length = qint_get_int(qobject_to_qint(entry->value));
329 if (length > 0 && length <= UINT_MAX) {
330 block_acct_add_interval(stats, (unsigned) length);
331 } else {
332 error_setg(errp, "Invalid interval length: %" PRId64, length);
333 return false;
334 }
335 break;
336 }
337
338 default:
339 error_setg(errp, "The specification of stats-intervals is invalid");
340 return false;
341 }
342 }
343 return true;
344 }
345
346 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
347
348 /* All parameters but @opts are optional and may be set to NULL. */
349 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
350 const char **throttling_group, ThrottleConfig *throttle_cfg,
351 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
352 {
353 const char *discard;
354 Error *local_error = NULL;
355 const char *aio;
356
357 if (bdrv_flags) {
358 if (!qemu_opt_get_bool(opts, "read-only", false)) {
359 *bdrv_flags |= BDRV_O_RDWR;
360 }
361 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
362 *bdrv_flags |= BDRV_O_COPY_ON_READ;
363 }
364
365 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
366 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
367 error_setg(errp, "Invalid discard option");
368 return;
369 }
370 }
371
372 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
373 if (!strcmp(aio, "native")) {
374 *bdrv_flags |= BDRV_O_NATIVE_AIO;
375 } else if (!strcmp(aio, "threads")) {
376 /* this is the default */
377 } else {
378 error_setg(errp, "invalid aio option");
379 return;
380 }
381 }
382 }
383
384 /* disk I/O throttling */
385 if (throttling_group) {
386 *throttling_group = qemu_opt_get(opts, "throttling.group");
387 }
388
389 if (throttle_cfg) {
390 throttle_config_init(throttle_cfg);
391 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
392 qemu_opt_get_number(opts, "throttling.bps-total", 0);
393 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
394 qemu_opt_get_number(opts, "throttling.bps-read", 0);
395 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
396 qemu_opt_get_number(opts, "throttling.bps-write", 0);
397 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
398 qemu_opt_get_number(opts, "throttling.iops-total", 0);
399 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
400 qemu_opt_get_number(opts, "throttling.iops-read", 0);
401 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
402 qemu_opt_get_number(opts, "throttling.iops-write", 0);
403
404 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
405 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
406 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
407 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
408 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
409 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
410 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
411 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
412 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
413 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
414 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
415 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
416
417 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
418 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
419 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
420 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
421 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
422 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
423 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
424 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
425 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
426 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
427 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
428 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
429
430 throttle_cfg->op_size =
431 qemu_opt_get_number(opts, "throttling.iops-size", 0);
432
433 if (!throttle_is_valid(throttle_cfg, errp)) {
434 return;
435 }
436 }
437
438 if (detect_zeroes) {
439 *detect_zeroes =
440 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
441 qemu_opt_get(opts, "detect-zeroes"),
442 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
443 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
444 &local_error);
445 if (local_error) {
446 error_propagate(errp, local_error);
447 return;
448 }
449
450 if (bdrv_flags &&
451 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
452 !(*bdrv_flags & BDRV_O_UNMAP))
453 {
454 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
455 "without setting discard operation to unmap");
456 return;
457 }
458 }
459 }
460
461 /* Takes the ownership of bs_opts */
462 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
463 Error **errp)
464 {
465 const char *buf;
466 int bdrv_flags = 0;
467 int on_read_error, on_write_error;
468 bool account_invalid, account_failed;
469 BlockBackend *blk;
470 BlockDriverState *bs;
471 ThrottleConfig cfg;
472 int snapshot = 0;
473 Error *error = NULL;
474 QemuOpts *opts;
475 QDict *interval_dict = NULL;
476 QList *interval_list = NULL;
477 const char *id;
478 BlockdevDetectZeroesOptions detect_zeroes =
479 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
480 const char *throttling_group = NULL;
481
482 /* Check common options by copying from bs_opts to opts, all other options
483 * stay in bs_opts for processing by bdrv_open(). */
484 id = qdict_get_try_str(bs_opts, "id");
485 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
486 if (error) {
487 error_propagate(errp, error);
488 goto err_no_opts;
489 }
490
491 qemu_opts_absorb_qdict(opts, bs_opts, &error);
492 if (error) {
493 error_propagate(errp, error);
494 goto early_err;
495 }
496
497 if (id) {
498 qdict_del(bs_opts, "id");
499 }
500
501 /* extract parameters */
502 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
503
504 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
505 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
506
507 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
508 qdict_array_split(interval_dict, &interval_list);
509
510 if (qdict_size(interval_dict) != 0) {
511 error_setg(errp, "Invalid option stats-intervals.%s",
512 qdict_first(interval_dict)->key);
513 goto early_err;
514 }
515
516 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
517 &detect_zeroes, &error);
518 if (error) {
519 error_propagate(errp, error);
520 goto early_err;
521 }
522
523 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
524 if (is_help_option(buf)) {
525 error_printf("Supported formats:");
526 bdrv_iterate_format(bdrv_format_print, NULL);
527 error_printf("\n");
528 goto early_err;
529 }
530
531 if (qdict_haskey(bs_opts, "driver")) {
532 error_setg(errp, "Cannot specify both 'driver' and 'format'");
533 goto early_err;
534 }
535 qdict_put(bs_opts, "driver", qstring_from_str(buf));
536 }
537
538 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
539 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
540 on_write_error = parse_block_error_action(buf, 0, &error);
541 if (error) {
542 error_propagate(errp, error);
543 goto early_err;
544 }
545 }
546
547 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
548 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
549 on_read_error = parse_block_error_action(buf, 1, &error);
550 if (error) {
551 error_propagate(errp, error);
552 goto early_err;
553 }
554 }
555
556 if (snapshot) {
557 bdrv_flags |= BDRV_O_SNAPSHOT;
558 }
559
560 /* init */
561 if ((!file || !*file) && !qdict_size(bs_opts)) {
562 BlockBackendRootState *blk_rs;
563
564 blk = blk_new(qemu_opts_id(opts), errp);
565 if (!blk) {
566 goto early_err;
567 }
568
569 blk_rs = blk_get_root_state(blk);
570 blk_rs->open_flags = bdrv_flags;
571 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
572 blk_rs->detect_zeroes = detect_zeroes;
573
574 if (throttle_enabled(&cfg)) {
575 if (!throttling_group) {
576 throttling_group = blk_name(blk);
577 }
578 blk_rs->throttle_group = g_strdup(throttling_group);
579 blk_rs->throttle_state = throttle_group_incref(throttling_group);
580 blk_rs->throttle_state->cfg = cfg;
581 }
582
583 QDECREF(bs_opts);
584 } else {
585 if (file && !*file) {
586 file = NULL;
587 }
588
589 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
590 * with other callers) rather than what we want as the real defaults.
591 * Apply the defaults here instead. */
592 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
593 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
594 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
595
596 if (runstate_check(RUN_STATE_INMIGRATE)) {
597 bdrv_flags |= BDRV_O_INACTIVE;
598 }
599
600 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
601 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 err_no_bs_opts:
634 qemu_opts_del(opts);
635 QDECREF(interval_dict);
636 QDECREF(interval_list);
637 return blk;
638
639 early_err:
640 qemu_opts_del(opts);
641 QDECREF(interval_dict);
642 QDECREF(interval_list);
643 err_no_opts:
644 QDECREF(bs_opts);
645 return NULL;
646 }
647
648 static QemuOptsList qemu_root_bds_opts;
649
650 /* Takes the ownership of bs_opts */
651 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
652 {
653 BlockDriverState *bs;
654 QemuOpts *opts;
655 Error *local_error = NULL;
656 BlockdevDetectZeroesOptions detect_zeroes;
657 int ret;
658 int bdrv_flags = 0;
659
660 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
661 if (!opts) {
662 goto fail;
663 }
664
665 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
666 if (local_error) {
667 error_propagate(errp, local_error);
668 goto fail;
669 }
670
671 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
672 &detect_zeroes, &local_error);
673 if (local_error) {
674 error_propagate(errp, local_error);
675 goto fail;
676 }
677
678 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
679 * with other callers) rather than what we want as the real defaults.
680 * Apply the defaults here instead. */
681 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
682 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
683 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
684
685 if (runstate_check(RUN_STATE_INMIGRATE)) {
686 bdrv_flags |= BDRV_O_INACTIVE;
687 }
688
689 bs = NULL;
690 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
691 if (ret < 0) {
692 goto fail_no_bs_opts;
693 }
694
695 bs->detect_zeroes = detect_zeroes;
696
697 fail_no_bs_opts:
698 qemu_opts_del(opts);
699 return bs;
700
701 fail:
702 qemu_opts_del(opts);
703 QDECREF(bs_opts);
704 return NULL;
705 }
706
707 void blockdev_close_all_bdrv_states(void)
708 {
709 BlockDriverState *bs, *next_bs;
710
711 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
712 AioContext *ctx = bdrv_get_aio_context(bs);
713
714 aio_context_acquire(ctx);
715 bdrv_unref(bs);
716 aio_context_release(ctx);
717 }
718 }
719
720 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
721 Error **errp)
722 {
723 const char *value;
724
725 value = qemu_opt_get(opts, from);
726 if (value) {
727 if (qemu_opt_find(opts, to)) {
728 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
729 "same time", to, from);
730 return;
731 }
732 }
733
734 /* rename all items in opts */
735 while ((value = qemu_opt_get(opts, from))) {
736 qemu_opt_set(opts, to, value, &error_abort);
737 qemu_opt_unset(opts, from);
738 }
739 }
740
741 QemuOptsList qemu_legacy_drive_opts = {
742 .name = "drive",
743 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
744 .desc = {
745 {
746 .name = "bus",
747 .type = QEMU_OPT_NUMBER,
748 .help = "bus number",
749 },{
750 .name = "unit",
751 .type = QEMU_OPT_NUMBER,
752 .help = "unit number (i.e. lun for scsi)",
753 },{
754 .name = "index",
755 .type = QEMU_OPT_NUMBER,
756 .help = "index number",
757 },{
758 .name = "media",
759 .type = QEMU_OPT_STRING,
760 .help = "media type (disk, cdrom)",
761 },{
762 .name = "if",
763 .type = QEMU_OPT_STRING,
764 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
765 },{
766 .name = "cyls",
767 .type = QEMU_OPT_NUMBER,
768 .help = "number of cylinders (ide disk geometry)",
769 },{
770 .name = "heads",
771 .type = QEMU_OPT_NUMBER,
772 .help = "number of heads (ide disk geometry)",
773 },{
774 .name = "secs",
775 .type = QEMU_OPT_NUMBER,
776 .help = "number of sectors (ide disk geometry)",
777 },{
778 .name = "trans",
779 .type = QEMU_OPT_STRING,
780 .help = "chs translation (auto, lba, none)",
781 },{
782 .name = "boot",
783 .type = QEMU_OPT_BOOL,
784 .help = "(deprecated, ignored)",
785 },{
786 .name = "addr",
787 .type = QEMU_OPT_STRING,
788 .help = "pci address (virtio only)",
789 },{
790 .name = "serial",
791 .type = QEMU_OPT_STRING,
792 .help = "disk serial number",
793 },{
794 .name = "file",
795 .type = QEMU_OPT_STRING,
796 .help = "file name",
797 },
798
799 /* Options that are passed on, but have special semantics with -drive */
800 {
801 .name = "read-only",
802 .type = QEMU_OPT_BOOL,
803 .help = "open drive file as read-only",
804 },{
805 .name = "rerror",
806 .type = QEMU_OPT_STRING,
807 .help = "read error action",
808 },{
809 .name = "werror",
810 .type = QEMU_OPT_STRING,
811 .help = "write error action",
812 },{
813 .name = "copy-on-read",
814 .type = QEMU_OPT_BOOL,
815 .help = "copy read data from backing file into image file",
816 },
817
818 { /* end of list */ }
819 },
820 };
821
822 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
823 {
824 const char *value;
825 BlockBackend *blk;
826 DriveInfo *dinfo = NULL;
827 QDict *bs_opts;
828 QemuOpts *legacy_opts;
829 DriveMediaType media = MEDIA_DISK;
830 BlockInterfaceType type;
831 int cyls, heads, secs, translation;
832 int max_devs, bus_id, unit_id, index;
833 const char *devaddr;
834 const char *werror, *rerror;
835 bool read_only = false;
836 bool copy_on_read;
837 const char *serial;
838 const char *filename;
839 Error *local_err = NULL;
840 int i;
841
842 /* Change legacy command line options into QMP ones */
843 static const struct {
844 const char *from;
845 const char *to;
846 } opt_renames[] = {
847 { "iops", "throttling.iops-total" },
848 { "iops_rd", "throttling.iops-read" },
849 { "iops_wr", "throttling.iops-write" },
850
851 { "bps", "throttling.bps-total" },
852 { "bps_rd", "throttling.bps-read" },
853 { "bps_wr", "throttling.bps-write" },
854
855 { "iops_max", "throttling.iops-total-max" },
856 { "iops_rd_max", "throttling.iops-read-max" },
857 { "iops_wr_max", "throttling.iops-write-max" },
858
859 { "bps_max", "throttling.bps-total-max" },
860 { "bps_rd_max", "throttling.bps-read-max" },
861 { "bps_wr_max", "throttling.bps-write-max" },
862
863 { "iops_size", "throttling.iops-size" },
864
865 { "group", "throttling.group" },
866
867 { "readonly", "read-only" },
868 };
869
870 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
871 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
872 &local_err);
873 if (local_err) {
874 error_report_err(local_err);
875 return NULL;
876 }
877 }
878
879 value = qemu_opt_get(all_opts, "cache");
880 if (value) {
881 int flags = 0;
882
883 if (bdrv_parse_cache_flags(value, &flags) != 0) {
884 error_report("invalid cache option");
885 return NULL;
886 }
887
888 /* Specific options take precedence */
889 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
890 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
891 !!(flags & BDRV_O_CACHE_WB), &error_abort);
892 }
893 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
894 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
895 !!(flags & BDRV_O_NOCACHE), &error_abort);
896 }
897 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
898 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
899 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
900 }
901 qemu_opt_unset(all_opts, "cache");
902 }
903
904 /* Get a QDict for processing the options */
905 bs_opts = qdict_new();
906 qemu_opts_to_qdict(all_opts, bs_opts);
907
908 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
909 &error_abort);
910 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
911 if (local_err) {
912 error_report_err(local_err);
913 goto fail;
914 }
915
916 /* Deprecated option boot=[on|off] */
917 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
918 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
919 "ignored. Future versions will reject this parameter. Please "
920 "update your scripts.\n");
921 }
922
923 /* Media type */
924 value = qemu_opt_get(legacy_opts, "media");
925 if (value) {
926 if (!strcmp(value, "disk")) {
927 media = MEDIA_DISK;
928 } else if (!strcmp(value, "cdrom")) {
929 media = MEDIA_CDROM;
930 read_only = true;
931 } else {
932 error_report("'%s' invalid media", value);
933 goto fail;
934 }
935 }
936
937 /* copy-on-read is disabled with a warning for read-only devices */
938 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
939 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
940
941 if (read_only && copy_on_read) {
942 error_report("warning: disabling copy-on-read on read-only drive");
943 copy_on_read = false;
944 }
945
946 qdict_put(bs_opts, "read-only",
947 qstring_from_str(read_only ? "on" : "off"));
948 qdict_put(bs_opts, "copy-on-read",
949 qstring_from_str(copy_on_read ? "on" :"off"));
950
951 /* Controller type */
952 value = qemu_opt_get(legacy_opts, "if");
953 if (value) {
954 for (type = 0;
955 type < IF_COUNT && strcmp(value, if_name[type]);
956 type++) {
957 }
958 if (type == IF_COUNT) {
959 error_report("unsupported bus type '%s'", value);
960 goto fail;
961 }
962 } else {
963 type = block_default_type;
964 }
965
966 /* Geometry */
967 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
968 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
969 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
970
971 if (cyls || heads || secs) {
972 if (cyls < 1) {
973 error_report("invalid physical cyls number");
974 goto fail;
975 }
976 if (heads < 1) {
977 error_report("invalid physical heads number");
978 goto fail;
979 }
980 if (secs < 1) {
981 error_report("invalid physical secs number");
982 goto fail;
983 }
984 }
985
986 translation = BIOS_ATA_TRANSLATION_AUTO;
987 value = qemu_opt_get(legacy_opts, "trans");
988 if (value != NULL) {
989 if (!cyls) {
990 error_report("'%s' trans must be used with cyls, heads and secs",
991 value);
992 goto fail;
993 }
994 if (!strcmp(value, "none")) {
995 translation = BIOS_ATA_TRANSLATION_NONE;
996 } else if (!strcmp(value, "lba")) {
997 translation = BIOS_ATA_TRANSLATION_LBA;
998 } else if (!strcmp(value, "large")) {
999 translation = BIOS_ATA_TRANSLATION_LARGE;
1000 } else if (!strcmp(value, "rechs")) {
1001 translation = BIOS_ATA_TRANSLATION_RECHS;
1002 } else if (!strcmp(value, "auto")) {
1003 translation = BIOS_ATA_TRANSLATION_AUTO;
1004 } else {
1005 error_report("'%s' invalid translation type", value);
1006 goto fail;
1007 }
1008 }
1009
1010 if (media == MEDIA_CDROM) {
1011 if (cyls || secs || heads) {
1012 error_report("CHS can't be set with media=cdrom");
1013 goto fail;
1014 }
1015 }
1016
1017 /* Device address specified by bus/unit or index.
1018 * If none was specified, try to find the first free one. */
1019 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
1020 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
1021 index = qemu_opt_get_number(legacy_opts, "index", -1);
1022
1023 max_devs = if_max_devs[type];
1024
1025 if (index != -1) {
1026 if (bus_id != 0 || unit_id != -1) {
1027 error_report("index cannot be used with bus and unit");
1028 goto fail;
1029 }
1030 bus_id = drive_index_to_bus_id(type, index);
1031 unit_id = drive_index_to_unit_id(type, index);
1032 }
1033
1034 if (unit_id == -1) {
1035 unit_id = 0;
1036 while (drive_get(type, bus_id, unit_id) != NULL) {
1037 unit_id++;
1038 if (max_devs && unit_id >= max_devs) {
1039 unit_id -= max_devs;
1040 bus_id++;
1041 }
1042 }
1043 }
1044
1045 if (max_devs && unit_id >= max_devs) {
1046 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1047 goto fail;
1048 }
1049
1050 if (drive_get(type, bus_id, unit_id) != NULL) {
1051 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1052 bus_id, unit_id, index);
1053 goto fail;
1054 }
1055
1056 /* Serial number */
1057 serial = qemu_opt_get(legacy_opts, "serial");
1058
1059 /* no id supplied -> create one */
1060 if (qemu_opts_id(all_opts) == NULL) {
1061 char *new_id;
1062 const char *mediastr = "";
1063 if (type == IF_IDE || type == IF_SCSI) {
1064 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1065 }
1066 if (max_devs) {
1067 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1068 mediastr, unit_id);
1069 } else {
1070 new_id = g_strdup_printf("%s%s%i", if_name[type],
1071 mediastr, unit_id);
1072 }
1073 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1074 g_free(new_id);
1075 }
1076
1077 /* Add virtio block device */
1078 devaddr = qemu_opt_get(legacy_opts, "addr");
1079 if (devaddr && type != IF_VIRTIO) {
1080 error_report("addr is not supported by this bus type");
1081 goto fail;
1082 }
1083
1084 if (type == IF_VIRTIO) {
1085 QemuOpts *devopts;
1086 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1087 &error_abort);
1088 if (arch_type == QEMU_ARCH_S390X) {
1089 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1090 } else {
1091 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1092 }
1093 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1094 &error_abort);
1095 if (devaddr) {
1096 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1097 }
1098 }
1099
1100 filename = qemu_opt_get(legacy_opts, "file");
1101
1102 /* Check werror/rerror compatibility with if=... */
1103 werror = qemu_opt_get(legacy_opts, "werror");
1104 if (werror != NULL) {
1105 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1106 type != IF_NONE) {
1107 error_report("werror is not supported by this bus type");
1108 goto fail;
1109 }
1110 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1111 }
1112
1113 rerror = qemu_opt_get(legacy_opts, "rerror");
1114 if (rerror != NULL) {
1115 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1116 type != IF_NONE) {
1117 error_report("rerror is not supported by this bus type");
1118 goto fail;
1119 }
1120 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1121 }
1122
1123 /* Actual block device init: Functionality shared with blockdev-add */
1124 blk = blockdev_init(filename, bs_opts, &local_err);
1125 bs_opts = NULL;
1126 if (!blk) {
1127 if (local_err) {
1128 error_report_err(local_err);
1129 }
1130 goto fail;
1131 } else {
1132 assert(!local_err);
1133 }
1134
1135 /* Create legacy DriveInfo */
1136 dinfo = g_malloc0(sizeof(*dinfo));
1137 dinfo->opts = all_opts;
1138
1139 dinfo->cyls = cyls;
1140 dinfo->heads = heads;
1141 dinfo->secs = secs;
1142 dinfo->trans = translation;
1143
1144 dinfo->type = type;
1145 dinfo->bus = bus_id;
1146 dinfo->unit = unit_id;
1147 dinfo->devaddr = devaddr;
1148 dinfo->serial = g_strdup(serial);
1149
1150 blk_set_legacy_dinfo(blk, dinfo);
1151
1152 switch(type) {
1153 case IF_IDE:
1154 case IF_SCSI:
1155 case IF_XEN:
1156 case IF_NONE:
1157 dinfo->media_cd = media == MEDIA_CDROM;
1158 break;
1159 default:
1160 break;
1161 }
1162
1163 fail:
1164 qemu_opts_del(legacy_opts);
1165 QDECREF(bs_opts);
1166 return dinfo;
1167 }
1168
1169 void hmp_commit(Monitor *mon, const QDict *qdict)
1170 {
1171 const char *device = qdict_get_str(qdict, "device");
1172 BlockBackend *blk;
1173 int ret;
1174
1175 if (!strcmp(device, "all")) {
1176 ret = bdrv_commit_all();
1177 } else {
1178 BlockDriverState *bs;
1179 AioContext *aio_context;
1180
1181 blk = blk_by_name(device);
1182 if (!blk) {
1183 monitor_printf(mon, "Device '%s' not found\n", device);
1184 return;
1185 }
1186 if (!blk_is_available(blk)) {
1187 monitor_printf(mon, "Device '%s' has no medium\n", device);
1188 return;
1189 }
1190
1191 bs = blk_bs(blk);
1192 aio_context = bdrv_get_aio_context(bs);
1193 aio_context_acquire(aio_context);
1194
1195 ret = bdrv_commit(bs);
1196
1197 aio_context_release(aio_context);
1198 }
1199 if (ret < 0) {
1200 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1201 strerror(-ret));
1202 }
1203 }
1204
1205 static void blockdev_do_action(TransactionAction *action, Error **errp)
1206 {
1207 TransactionActionList list;
1208
1209 list.value = action;
1210 list.next = NULL;
1211 qmp_transaction(&list, false, NULL, errp);
1212 }
1213
1214 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1215 bool has_node_name, const char *node_name,
1216 const char *snapshot_file,
1217 bool has_snapshot_node_name,
1218 const char *snapshot_node_name,
1219 bool has_format, const char *format,
1220 bool has_mode, NewImageMode mode, Error **errp)
1221 {
1222 BlockdevSnapshotSync snapshot = {
1223 .has_device = has_device,
1224 .device = (char *) device,
1225 .has_node_name = has_node_name,
1226 .node_name = (char *) node_name,
1227 .snapshot_file = (char *) snapshot_file,
1228 .has_snapshot_node_name = has_snapshot_node_name,
1229 .snapshot_node_name = (char *) snapshot_node_name,
1230 .has_format = has_format,
1231 .format = (char *) format,
1232 .has_mode = has_mode,
1233 .mode = mode,
1234 };
1235 TransactionAction action = {
1236 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1237 .u.blockdev_snapshot_sync = &snapshot,
1238 };
1239 blockdev_do_action(&action, errp);
1240 }
1241
1242 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1243 Error **errp)
1244 {
1245 BlockdevSnapshot snapshot_data = {
1246 .node = (char *) node,
1247 .overlay = (char *) overlay
1248 };
1249 TransactionAction action = {
1250 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1251 .u.blockdev_snapshot = &snapshot_data,
1252 };
1253 blockdev_do_action(&action, errp);
1254 }
1255
1256 void qmp_blockdev_snapshot_internal_sync(const char *device,
1257 const char *name,
1258 Error **errp)
1259 {
1260 BlockdevSnapshotInternal snapshot = {
1261 .device = (char *) device,
1262 .name = (char *) name
1263 };
1264 TransactionAction action = {
1265 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1266 .u.blockdev_snapshot_internal_sync = &snapshot,
1267 };
1268 blockdev_do_action(&action, errp);
1269 }
1270
1271 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1272 bool has_id,
1273 const char *id,
1274 bool has_name,
1275 const char *name,
1276 Error **errp)
1277 {
1278 BlockDriverState *bs;
1279 BlockBackend *blk;
1280 AioContext *aio_context;
1281 QEMUSnapshotInfo sn;
1282 Error *local_err = NULL;
1283 SnapshotInfo *info = NULL;
1284 int ret;
1285
1286 blk = blk_by_name(device);
1287 if (!blk) {
1288 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1289 "Device '%s' not found", device);
1290 return NULL;
1291 }
1292
1293 aio_context = blk_get_aio_context(blk);
1294 aio_context_acquire(aio_context);
1295
1296 if (!has_id) {
1297 id = NULL;
1298 }
1299
1300 if (!has_name) {
1301 name = NULL;
1302 }
1303
1304 if (!id && !name) {
1305 error_setg(errp, "Name or id must be provided");
1306 goto out_aio_context;
1307 }
1308
1309 if (!blk_is_available(blk)) {
1310 error_setg(errp, "Device '%s' has no medium", device);
1311 goto out_aio_context;
1312 }
1313 bs = blk_bs(blk);
1314
1315 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1316 goto out_aio_context;
1317 }
1318
1319 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1320 if (local_err) {
1321 error_propagate(errp, local_err);
1322 goto out_aio_context;
1323 }
1324 if (!ret) {
1325 error_setg(errp,
1326 "Snapshot with id '%s' and name '%s' does not exist on "
1327 "device '%s'",
1328 STR_OR_NULL(id), STR_OR_NULL(name), device);
1329 goto out_aio_context;
1330 }
1331
1332 bdrv_snapshot_delete(bs, id, name, &local_err);
1333 if (local_err) {
1334 error_propagate(errp, local_err);
1335 goto out_aio_context;
1336 }
1337
1338 aio_context_release(aio_context);
1339
1340 info = g_new0(SnapshotInfo, 1);
1341 info->id = g_strdup(sn.id_str);
1342 info->name = g_strdup(sn.name);
1343 info->date_nsec = sn.date_nsec;
1344 info->date_sec = sn.date_sec;
1345 info->vm_state_size = sn.vm_state_size;
1346 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1347 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1348
1349 return info;
1350
1351 out_aio_context:
1352 aio_context_release(aio_context);
1353 return NULL;
1354 }
1355
1356 /**
1357 * block_dirty_bitmap_lookup:
1358 * Return a dirty bitmap (if present), after validating
1359 * the node reference and bitmap names.
1360 *
1361 * @node: The name of the BDS node to search for bitmaps
1362 * @name: The name of the bitmap to search for
1363 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1364 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1365 * @errp: Output pointer for error information. Can be NULL.
1366 *
1367 * @return: A bitmap object on success, or NULL on failure.
1368 */
1369 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1370 const char *name,
1371 BlockDriverState **pbs,
1372 AioContext **paio,
1373 Error **errp)
1374 {
1375 BlockDriverState *bs;
1376 BdrvDirtyBitmap *bitmap;
1377 AioContext *aio_context;
1378
1379 if (!node) {
1380 error_setg(errp, "Node cannot be NULL");
1381 return NULL;
1382 }
1383 if (!name) {
1384 error_setg(errp, "Bitmap name cannot be NULL");
1385 return NULL;
1386 }
1387 bs = bdrv_lookup_bs(node, node, NULL);
1388 if (!bs) {
1389 error_setg(errp, "Node '%s' not found", node);
1390 return NULL;
1391 }
1392
1393 aio_context = bdrv_get_aio_context(bs);
1394 aio_context_acquire(aio_context);
1395
1396 bitmap = bdrv_find_dirty_bitmap(bs, name);
1397 if (!bitmap) {
1398 error_setg(errp, "Dirty bitmap '%s' not found", name);
1399 goto fail;
1400 }
1401
1402 if (pbs) {
1403 *pbs = bs;
1404 }
1405 if (paio) {
1406 *paio = aio_context;
1407 } else {
1408 aio_context_release(aio_context);
1409 }
1410
1411 return bitmap;
1412
1413 fail:
1414 aio_context_release(aio_context);
1415 return NULL;
1416 }
1417
1418 /* New and old BlockDriverState structs for atomic group operations */
1419
1420 typedef struct BlkActionState BlkActionState;
1421
1422 /**
1423 * BlkActionOps:
1424 * Table of operations that define an Action.
1425 *
1426 * @instance_size: Size of state struct, in bytes.
1427 * @prepare: Prepare the work, must NOT be NULL.
1428 * @commit: Commit the changes, can be NULL.
1429 * @abort: Abort the changes on fail, can be NULL.
1430 * @clean: Clean up resources after all transaction actions have called
1431 * commit() or abort(). Can be NULL.
1432 *
1433 * Only prepare() may fail. In a single transaction, only one of commit() or
1434 * abort() will be called. clean() will always be called if it is present.
1435 */
1436 typedef struct BlkActionOps {
1437 size_t instance_size;
1438 void (*prepare)(BlkActionState *common, Error **errp);
1439 void (*commit)(BlkActionState *common);
1440 void (*abort)(BlkActionState *common);
1441 void (*clean)(BlkActionState *common);
1442 } BlkActionOps;
1443
1444 /**
1445 * BlkActionState:
1446 * Describes one Action's state within a Transaction.
1447 *
1448 * @action: QAPI-defined enum identifying which Action to perform.
1449 * @ops: Table of ActionOps this Action can perform.
1450 * @block_job_txn: Transaction which this action belongs to.
1451 * @entry: List membership for all Actions in this Transaction.
1452 *
1453 * This structure must be arranged as first member in a subclassed type,
1454 * assuming that the compiler will also arrange it to the same offsets as the
1455 * base class.
1456 */
1457 struct BlkActionState {
1458 TransactionAction *action;
1459 const BlkActionOps *ops;
1460 BlockJobTxn *block_job_txn;
1461 TransactionProperties *txn_props;
1462 QSIMPLEQ_ENTRY(BlkActionState) entry;
1463 };
1464
1465 /* internal snapshot private data */
1466 typedef struct InternalSnapshotState {
1467 BlkActionState common;
1468 BlockDriverState *bs;
1469 AioContext *aio_context;
1470 QEMUSnapshotInfo sn;
1471 bool created;
1472 } InternalSnapshotState;
1473
1474
1475 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1476 {
1477 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1478 error_setg(errp,
1479 "Action '%s' does not support Transaction property "
1480 "completion-mode = %s",
1481 TransactionActionKind_lookup[s->action->type],
1482 ActionCompletionMode_lookup[s->txn_props->completion_mode]);
1483 return -1;
1484 }
1485 return 0;
1486 }
1487
1488 static void internal_snapshot_prepare(BlkActionState *common,
1489 Error **errp)
1490 {
1491 Error *local_err = NULL;
1492 const char *device;
1493 const char *name;
1494 BlockBackend *blk;
1495 BlockDriverState *bs;
1496 QEMUSnapshotInfo old_sn, *sn;
1497 bool ret;
1498 qemu_timeval tv;
1499 BlockdevSnapshotInternal *internal;
1500 InternalSnapshotState *state;
1501 int ret1;
1502
1503 g_assert(common->action->type ==
1504 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1505 internal = common->action->u.blockdev_snapshot_internal_sync;
1506 state = DO_UPCAST(InternalSnapshotState, common, common);
1507
1508 /* 1. parse input */
1509 device = internal->device;
1510 name = internal->name;
1511
1512 /* 2. check for validation */
1513 if (action_check_completion_mode(common, errp) < 0) {
1514 return;
1515 }
1516
1517 blk = blk_by_name(device);
1518 if (!blk) {
1519 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1520 "Device '%s' not found", device);
1521 return;
1522 }
1523
1524 /* AioContext is released in .clean() */
1525 state->aio_context = blk_get_aio_context(blk);
1526 aio_context_acquire(state->aio_context);
1527
1528 if (!blk_is_available(blk)) {
1529 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1530 return;
1531 }
1532 bs = blk_bs(blk);
1533
1534 state->bs = bs;
1535 bdrv_drained_begin(bs);
1536
1537 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1538 return;
1539 }
1540
1541 if (bdrv_is_read_only(bs)) {
1542 error_setg(errp, "Device '%s' is read only", device);
1543 return;
1544 }
1545
1546 if (!bdrv_can_snapshot(bs)) {
1547 error_setg(errp, "Block format '%s' used by device '%s' "
1548 "does not support internal snapshots",
1549 bs->drv->format_name, device);
1550 return;
1551 }
1552
1553 if (!strlen(name)) {
1554 error_setg(errp, "Name is empty");
1555 return;
1556 }
1557
1558 /* check whether a snapshot with name exist */
1559 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1560 &local_err);
1561 if (local_err) {
1562 error_propagate(errp, local_err);
1563 return;
1564 } else if (ret) {
1565 error_setg(errp,
1566 "Snapshot with name '%s' already exists on device '%s'",
1567 name, device);
1568 return;
1569 }
1570
1571 /* 3. take the snapshot */
1572 sn = &state->sn;
1573 pstrcpy(sn->name, sizeof(sn->name), name);
1574 qemu_gettimeofday(&tv);
1575 sn->date_sec = tv.tv_sec;
1576 sn->date_nsec = tv.tv_usec * 1000;
1577 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1578
1579 ret1 = bdrv_snapshot_create(bs, sn);
1580 if (ret1 < 0) {
1581 error_setg_errno(errp, -ret1,
1582 "Failed to create snapshot '%s' on device '%s'",
1583 name, device);
1584 return;
1585 }
1586
1587 /* 4. succeed, mark a snapshot is created */
1588 state->created = true;
1589 }
1590
1591 static void internal_snapshot_abort(BlkActionState *common)
1592 {
1593 InternalSnapshotState *state =
1594 DO_UPCAST(InternalSnapshotState, common, common);
1595 BlockDriverState *bs = state->bs;
1596 QEMUSnapshotInfo *sn = &state->sn;
1597 Error *local_error = NULL;
1598
1599 if (!state->created) {
1600 return;
1601 }
1602
1603 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1604 error_reportf_err(local_error,
1605 "Failed to delete snapshot with id '%s' and "
1606 "name '%s' on device '%s' in abort: ",
1607 sn->id_str, sn->name,
1608 bdrv_get_device_name(bs));
1609 }
1610 }
1611
1612 static void internal_snapshot_clean(BlkActionState *common)
1613 {
1614 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1615 common, common);
1616
1617 if (state->aio_context) {
1618 if (state->bs) {
1619 bdrv_drained_end(state->bs);
1620 }
1621 aio_context_release(state->aio_context);
1622 }
1623 }
1624
1625 /* external snapshot private data */
1626 typedef struct ExternalSnapshotState {
1627 BlkActionState common;
1628 BlockDriverState *old_bs;
1629 BlockDriverState *new_bs;
1630 AioContext *aio_context;
1631 } ExternalSnapshotState;
1632
1633 static void external_snapshot_prepare(BlkActionState *common,
1634 Error **errp)
1635 {
1636 int flags = 0, ret;
1637 QDict *options = NULL;
1638 Error *local_err = NULL;
1639 /* Device and node name of the image to generate the snapshot from */
1640 const char *device;
1641 const char *node_name;
1642 /* Reference to the new image (for 'blockdev-snapshot') */
1643 const char *snapshot_ref;
1644 /* File name of the new image (for 'blockdev-snapshot-sync') */
1645 const char *new_image_file;
1646 ExternalSnapshotState *state =
1647 DO_UPCAST(ExternalSnapshotState, common, common);
1648 TransactionAction *action = common->action;
1649
1650 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1651 * purpose but a different set of parameters */
1652 switch (action->type) {
1653 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1654 {
1655 BlockdevSnapshot *s = action->u.blockdev_snapshot;
1656 device = s->node;
1657 node_name = s->node;
1658 new_image_file = NULL;
1659 snapshot_ref = s->overlay;
1660 }
1661 break;
1662 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1663 {
1664 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1665 device = s->has_device ? s->device : NULL;
1666 node_name = s->has_node_name ? s->node_name : NULL;
1667 new_image_file = s->snapshot_file;
1668 snapshot_ref = NULL;
1669 }
1670 break;
1671 default:
1672 g_assert_not_reached();
1673 }
1674
1675 /* start processing */
1676 if (action_check_completion_mode(common, errp) < 0) {
1677 return;
1678 }
1679
1680 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1681 if (!state->old_bs) {
1682 return;
1683 }
1684
1685 /* Acquire AioContext now so any threads operating on old_bs stop */
1686 state->aio_context = bdrv_get_aio_context(state->old_bs);
1687 aio_context_acquire(state->aio_context);
1688 bdrv_drained_begin(state->old_bs);
1689
1690 if (!bdrv_is_inserted(state->old_bs)) {
1691 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1692 return;
1693 }
1694
1695 if (bdrv_op_is_blocked(state->old_bs,
1696 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1697 return;
1698 }
1699
1700 if (!bdrv_is_read_only(state->old_bs)) {
1701 if (bdrv_flush(state->old_bs)) {
1702 error_setg(errp, QERR_IO_ERROR);
1703 return;
1704 }
1705 }
1706
1707 if (!bdrv_is_first_non_filter(state->old_bs)) {
1708 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1709 return;
1710 }
1711
1712 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1713 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1714 const char *format = s->has_format ? s->format : "qcow2";
1715 enum NewImageMode mode;
1716 const char *snapshot_node_name =
1717 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1718
1719 if (node_name && !snapshot_node_name) {
1720 error_setg(errp, "New snapshot node name missing");
1721 return;
1722 }
1723
1724 if (snapshot_node_name &&
1725 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1726 error_setg(errp, "New snapshot node name already in use");
1727 return;
1728 }
1729
1730 flags = state->old_bs->open_flags;
1731
1732 /* create new image w/backing file */
1733 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1734 if (mode != NEW_IMAGE_MODE_EXISTING) {
1735 int64_t size = bdrv_getlength(state->old_bs);
1736 if (size < 0) {
1737 error_setg_errno(errp, -size, "bdrv_getlength failed");
1738 return;
1739 }
1740 bdrv_img_create(new_image_file, format,
1741 state->old_bs->filename,
1742 state->old_bs->drv->format_name,
1743 NULL, size, flags, &local_err, false);
1744 if (local_err) {
1745 error_propagate(errp, local_err);
1746 return;
1747 }
1748 }
1749
1750 options = qdict_new();
1751 if (s->has_snapshot_node_name) {
1752 qdict_put(options, "node-name",
1753 qstring_from_str(snapshot_node_name));
1754 }
1755 qdict_put(options, "driver", qstring_from_str(format));
1756
1757 flags |= BDRV_O_NO_BACKING;
1758 }
1759
1760 assert(state->new_bs == NULL);
1761 ret = bdrv_open(&state->new_bs, new_image_file, snapshot_ref, options,
1762 flags, errp);
1763 /* We will manually add the backing_hd field to the bs later */
1764 if (ret != 0) {
1765 return;
1766 }
1767
1768 if (state->new_bs->blk != NULL) {
1769 error_setg(errp, "The snapshot is already in use by %s",
1770 blk_name(state->new_bs->blk));
1771 return;
1772 }
1773
1774 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1775 errp)) {
1776 return;
1777 }
1778
1779 if (state->new_bs->backing != NULL) {
1780 error_setg(errp, "The snapshot already has a backing image");
1781 return;
1782 }
1783
1784 if (!state->new_bs->drv->supports_backing) {
1785 error_setg(errp, "The snapshot does not support backing images");
1786 }
1787 }
1788
1789 static void external_snapshot_commit(BlkActionState *common)
1790 {
1791 ExternalSnapshotState *state =
1792 DO_UPCAST(ExternalSnapshotState, common, common);
1793
1794 bdrv_set_aio_context(state->new_bs, state->aio_context);
1795
1796 /* This removes our old bs and adds the new bs */
1797 bdrv_append(state->new_bs, state->old_bs);
1798 /* We don't need (or want) to use the transactional
1799 * bdrv_reopen_multiple() across all the entries at once, because we
1800 * don't want to abort all of them if one of them fails the reopen */
1801 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1802 NULL);
1803 }
1804
1805 static void external_snapshot_abort(BlkActionState *common)
1806 {
1807 ExternalSnapshotState *state =
1808 DO_UPCAST(ExternalSnapshotState, common, common);
1809 if (state->new_bs) {
1810 bdrv_unref(state->new_bs);
1811 }
1812 }
1813
1814 static void external_snapshot_clean(BlkActionState *common)
1815 {
1816 ExternalSnapshotState *state =
1817 DO_UPCAST(ExternalSnapshotState, common, common);
1818 if (state->aio_context) {
1819 bdrv_drained_end(state->old_bs);
1820 aio_context_release(state->aio_context);
1821 }
1822 }
1823
1824 typedef struct DriveBackupState {
1825 BlkActionState common;
1826 BlockDriverState *bs;
1827 AioContext *aio_context;
1828 BlockJob *job;
1829 } DriveBackupState;
1830
1831 static void do_drive_backup(const char *device, const char *target,
1832 bool has_format, const char *format,
1833 enum MirrorSyncMode sync,
1834 bool has_mode, enum NewImageMode mode,
1835 bool has_speed, int64_t speed,
1836 bool has_bitmap, const char *bitmap,
1837 bool has_on_source_error,
1838 BlockdevOnError on_source_error,
1839 bool has_on_target_error,
1840 BlockdevOnError on_target_error,
1841 BlockJobTxn *txn, Error **errp);
1842
1843 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1844 {
1845 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1846 BlockBackend *blk;
1847 DriveBackup *backup;
1848 Error *local_err = NULL;
1849
1850 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1851 backup = common->action->u.drive_backup;
1852
1853 blk = blk_by_name(backup->device);
1854 if (!blk) {
1855 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1856 "Device '%s' not found", backup->device);
1857 return;
1858 }
1859
1860 if (!blk_is_available(blk)) {
1861 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1862 return;
1863 }
1864
1865 /* AioContext is released in .clean() */
1866 state->aio_context = blk_get_aio_context(blk);
1867 aio_context_acquire(state->aio_context);
1868 bdrv_drained_begin(blk_bs(blk));
1869 state->bs = blk_bs(blk);
1870
1871 do_drive_backup(backup->device, backup->target,
1872 backup->has_format, backup->format,
1873 backup->sync,
1874 backup->has_mode, backup->mode,
1875 backup->has_speed, backup->speed,
1876 backup->has_bitmap, backup->bitmap,
1877 backup->has_on_source_error, backup->on_source_error,
1878 backup->has_on_target_error, backup->on_target_error,
1879 common->block_job_txn, &local_err);
1880 if (local_err) {
1881 error_propagate(errp, local_err);
1882 return;
1883 }
1884
1885 state->job = state->bs->job;
1886 }
1887
1888 static void drive_backup_abort(BlkActionState *common)
1889 {
1890 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1891 BlockDriverState *bs = state->bs;
1892
1893 /* Only cancel if it's the job we started */
1894 if (bs && bs->job && bs->job == state->job) {
1895 block_job_cancel_sync(bs->job);
1896 }
1897 }
1898
1899 static void drive_backup_clean(BlkActionState *common)
1900 {
1901 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1902
1903 if (state->aio_context) {
1904 bdrv_drained_end(state->bs);
1905 aio_context_release(state->aio_context);
1906 }
1907 }
1908
1909 typedef struct BlockdevBackupState {
1910 BlkActionState common;
1911 BlockDriverState *bs;
1912 BlockJob *job;
1913 AioContext *aio_context;
1914 } BlockdevBackupState;
1915
1916 static void do_blockdev_backup(const char *device, const char *target,
1917 enum MirrorSyncMode sync,
1918 bool has_speed, int64_t speed,
1919 bool has_on_source_error,
1920 BlockdevOnError on_source_error,
1921 bool has_on_target_error,
1922 BlockdevOnError on_target_error,
1923 BlockJobTxn *txn, Error **errp);
1924
1925 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1926 {
1927 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1928 BlockdevBackup *backup;
1929 BlockBackend *blk, *target;
1930 Error *local_err = NULL;
1931
1932 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1933 backup = common->action->u.blockdev_backup;
1934
1935 blk = blk_by_name(backup->device);
1936 if (!blk) {
1937 error_setg(errp, "Device '%s' not found", backup->device);
1938 return;
1939 }
1940
1941 if (!blk_is_available(blk)) {
1942 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1943 return;
1944 }
1945
1946 target = blk_by_name(backup->target);
1947 if (!target) {
1948 error_setg(errp, "Device '%s' not found", backup->target);
1949 return;
1950 }
1951
1952 /* AioContext is released in .clean() */
1953 state->aio_context = blk_get_aio_context(blk);
1954 if (state->aio_context != blk_get_aio_context(target)) {
1955 state->aio_context = NULL;
1956 error_setg(errp, "Backup between two IO threads is not implemented");
1957 return;
1958 }
1959 aio_context_acquire(state->aio_context);
1960 state->bs = blk_bs(blk);
1961 bdrv_drained_begin(state->bs);
1962
1963 do_blockdev_backup(backup->device, backup->target,
1964 backup->sync,
1965 backup->has_speed, backup->speed,
1966 backup->has_on_source_error, backup->on_source_error,
1967 backup->has_on_target_error, backup->on_target_error,
1968 common->block_job_txn, &local_err);
1969 if (local_err) {
1970 error_propagate(errp, local_err);
1971 return;
1972 }
1973
1974 state->job = state->bs->job;
1975 }
1976
1977 static void blockdev_backup_abort(BlkActionState *common)
1978 {
1979 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1980 BlockDriverState *bs = state->bs;
1981
1982 /* Only cancel if it's the job we started */
1983 if (bs && bs->job && bs->job == state->job) {
1984 block_job_cancel_sync(bs->job);
1985 }
1986 }
1987
1988 static void blockdev_backup_clean(BlkActionState *common)
1989 {
1990 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1991
1992 if (state->aio_context) {
1993 bdrv_drained_end(state->bs);
1994 aio_context_release(state->aio_context);
1995 }
1996 }
1997
1998 typedef struct BlockDirtyBitmapState {
1999 BlkActionState common;
2000 BdrvDirtyBitmap *bitmap;
2001 BlockDriverState *bs;
2002 AioContext *aio_context;
2003 HBitmap *backup;
2004 bool prepared;
2005 } BlockDirtyBitmapState;
2006
2007 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2008 Error **errp)
2009 {
2010 Error *local_err = NULL;
2011 BlockDirtyBitmapAdd *action;
2012 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2013 common, common);
2014
2015 if (action_check_completion_mode(common, errp) < 0) {
2016 return;
2017 }
2018
2019 action = common->action->u.block_dirty_bitmap_add;
2020 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2021 qmp_block_dirty_bitmap_add(action->node, action->name,
2022 action->has_granularity, action->granularity,
2023 &local_err);
2024
2025 if (!local_err) {
2026 state->prepared = true;
2027 } else {
2028 error_propagate(errp, local_err);
2029 }
2030 }
2031
2032 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2033 {
2034 BlockDirtyBitmapAdd *action;
2035 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2036 common, common);
2037
2038 action = common->action->u.block_dirty_bitmap_add;
2039 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2040 * then the node reference and bitmap name must have been valid.
2041 */
2042 if (state->prepared) {
2043 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2044 }
2045 }
2046
2047 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2048 Error **errp)
2049 {
2050 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2051 common, common);
2052 BlockDirtyBitmap *action;
2053
2054 if (action_check_completion_mode(common, errp) < 0) {
2055 return;
2056 }
2057
2058 action = common->action->u.block_dirty_bitmap_clear;
2059 state->bitmap = block_dirty_bitmap_lookup(action->node,
2060 action->name,
2061 &state->bs,
2062 &state->aio_context,
2063 errp);
2064 if (!state->bitmap) {
2065 return;
2066 }
2067
2068 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2069 error_setg(errp, "Cannot modify a frozen bitmap");
2070 return;
2071 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2072 error_setg(errp, "Cannot clear a disabled bitmap");
2073 return;
2074 }
2075
2076 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2077 /* AioContext is released in .clean() */
2078 }
2079
2080 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2081 {
2082 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2083 common, common);
2084
2085 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2086 }
2087
2088 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2089 {
2090 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2091 common, common);
2092
2093 hbitmap_free(state->backup);
2094 }
2095
2096 static void block_dirty_bitmap_clear_clean(BlkActionState *common)
2097 {
2098 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2099 common, common);
2100
2101 if (state->aio_context) {
2102 aio_context_release(state->aio_context);
2103 }
2104 }
2105
2106 static void abort_prepare(BlkActionState *common, Error **errp)
2107 {
2108 error_setg(errp, "Transaction aborted using Abort action");
2109 }
2110
2111 static void abort_commit(BlkActionState *common)
2112 {
2113 g_assert_not_reached(); /* this action never succeeds */
2114 }
2115
2116 static const BlkActionOps actions[] = {
2117 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2118 .instance_size = sizeof(ExternalSnapshotState),
2119 .prepare = external_snapshot_prepare,
2120 .commit = external_snapshot_commit,
2121 .abort = external_snapshot_abort,
2122 .clean = external_snapshot_clean,
2123 },
2124 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2125 .instance_size = sizeof(ExternalSnapshotState),
2126 .prepare = external_snapshot_prepare,
2127 .commit = external_snapshot_commit,
2128 .abort = external_snapshot_abort,
2129 .clean = external_snapshot_clean,
2130 },
2131 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2132 .instance_size = sizeof(DriveBackupState),
2133 .prepare = drive_backup_prepare,
2134 .abort = drive_backup_abort,
2135 .clean = drive_backup_clean,
2136 },
2137 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2138 .instance_size = sizeof(BlockdevBackupState),
2139 .prepare = blockdev_backup_prepare,
2140 .abort = blockdev_backup_abort,
2141 .clean = blockdev_backup_clean,
2142 },
2143 [TRANSACTION_ACTION_KIND_ABORT] = {
2144 .instance_size = sizeof(BlkActionState),
2145 .prepare = abort_prepare,
2146 .commit = abort_commit,
2147 },
2148 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2149 .instance_size = sizeof(InternalSnapshotState),
2150 .prepare = internal_snapshot_prepare,
2151 .abort = internal_snapshot_abort,
2152 .clean = internal_snapshot_clean,
2153 },
2154 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2155 .instance_size = sizeof(BlockDirtyBitmapState),
2156 .prepare = block_dirty_bitmap_add_prepare,
2157 .abort = block_dirty_bitmap_add_abort,
2158 },
2159 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2160 .instance_size = sizeof(BlockDirtyBitmapState),
2161 .prepare = block_dirty_bitmap_clear_prepare,
2162 .commit = block_dirty_bitmap_clear_commit,
2163 .abort = block_dirty_bitmap_clear_abort,
2164 .clean = block_dirty_bitmap_clear_clean,
2165 }
2166 };
2167
2168 /**
2169 * Allocate a TransactionProperties structure if necessary, and fill
2170 * that structure with desired defaults if they are unset.
2171 */
2172 static TransactionProperties *get_transaction_properties(
2173 TransactionProperties *props)
2174 {
2175 if (!props) {
2176 props = g_new0(TransactionProperties, 1);
2177 }
2178
2179 if (!props->has_completion_mode) {
2180 props->has_completion_mode = true;
2181 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2182 }
2183
2184 return props;
2185 }
2186
2187 /*
2188 * 'Atomic' group operations. The operations are performed as a set, and if
2189 * any fail then we roll back all operations in the group.
2190 */
2191 void qmp_transaction(TransactionActionList *dev_list,
2192 bool has_props,
2193 struct TransactionProperties *props,
2194 Error **errp)
2195 {
2196 TransactionActionList *dev_entry = dev_list;
2197 BlockJobTxn *block_job_txn = NULL;
2198 BlkActionState *state, *next;
2199 Error *local_err = NULL;
2200
2201 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2202 QSIMPLEQ_INIT(&snap_bdrv_states);
2203
2204 /* Does this transaction get canceled as a group on failure?
2205 * If not, we don't really need to make a BlockJobTxn.
2206 */
2207 props = get_transaction_properties(props);
2208 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2209 block_job_txn = block_job_txn_new();
2210 }
2211
2212 /* drain all i/o before any operations */
2213 bdrv_drain_all();
2214
2215 /* We don't do anything in this loop that commits us to the operations */
2216 while (NULL != dev_entry) {
2217 TransactionAction *dev_info = NULL;
2218 const BlkActionOps *ops;
2219
2220 dev_info = dev_entry->value;
2221 dev_entry = dev_entry->next;
2222
2223 assert(dev_info->type < ARRAY_SIZE(actions));
2224
2225 ops = &actions[dev_info->type];
2226 assert(ops->instance_size > 0);
2227
2228 state = g_malloc0(ops->instance_size);
2229 state->ops = ops;
2230 state->action = dev_info;
2231 state->block_job_txn = block_job_txn;
2232 state->txn_props = props;
2233 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2234
2235 state->ops->prepare(state, &local_err);
2236 if (local_err) {
2237 error_propagate(errp, local_err);
2238 goto delete_and_fail;
2239 }
2240 }
2241
2242 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2243 if (state->ops->commit) {
2244 state->ops->commit(state);
2245 }
2246 }
2247
2248 /* success */
2249 goto exit;
2250
2251 delete_and_fail:
2252 /* failure, and it is all-or-none; roll back all operations */
2253 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2254 if (state->ops->abort) {
2255 state->ops->abort(state);
2256 }
2257 }
2258 exit:
2259 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2260 if (state->ops->clean) {
2261 state->ops->clean(state);
2262 }
2263 g_free(state);
2264 }
2265 if (!has_props) {
2266 qapi_free_TransactionProperties(props);
2267 }
2268 block_job_txn_unref(block_job_txn);
2269 }
2270
2271 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
2272 {
2273 Error *local_err = NULL;
2274
2275 qmp_blockdev_open_tray(device, has_force, force, &local_err);
2276 if (local_err) {
2277 error_propagate(errp, local_err);
2278 return;
2279 }
2280
2281 qmp_x_blockdev_remove_medium(device, errp);
2282 }
2283
2284 void qmp_block_passwd(bool has_device, const char *device,
2285 bool has_node_name, const char *node_name,
2286 const char *password, Error **errp)
2287 {
2288 Error *local_err = NULL;
2289 BlockDriverState *bs;
2290 AioContext *aio_context;
2291
2292 bs = bdrv_lookup_bs(has_device ? device : NULL,
2293 has_node_name ? node_name : NULL,
2294 &local_err);
2295 if (local_err) {
2296 error_propagate(errp, local_err);
2297 return;
2298 }
2299
2300 aio_context = bdrv_get_aio_context(bs);
2301 aio_context_acquire(aio_context);
2302
2303 bdrv_add_key(bs, password, errp);
2304
2305 aio_context_release(aio_context);
2306 }
2307
2308 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force,
2309 Error **errp)
2310 {
2311 BlockBackend *blk;
2312 bool locked;
2313
2314 if (!has_force) {
2315 force = false;
2316 }
2317
2318 blk = blk_by_name(device);
2319 if (!blk) {
2320 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2321 "Device '%s' not found", device);
2322 return;
2323 }
2324
2325 if (!blk_dev_has_removable_media(blk)) {
2326 error_setg(errp, "Device '%s' is not removable", device);
2327 return;
2328 }
2329
2330 if (!blk_dev_has_tray(blk)) {
2331 /* Ignore this command on tray-less devices */
2332 return;
2333 }
2334
2335 if (blk_dev_is_tray_open(blk)) {
2336 return;
2337 }
2338
2339 locked = blk_dev_is_medium_locked(blk);
2340 if (locked) {
2341 blk_dev_eject_request(blk, force);
2342 }
2343
2344 if (!locked || force) {
2345 blk_dev_change_media_cb(blk, false);
2346 }
2347 }
2348
2349 void qmp_blockdev_close_tray(const char *device, Error **errp)
2350 {
2351 BlockBackend *blk;
2352
2353 blk = blk_by_name(device);
2354 if (!blk) {
2355 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2356 "Device '%s' not found", device);
2357 return;
2358 }
2359
2360 if (!blk_dev_has_removable_media(blk)) {
2361 error_setg(errp, "Device '%s' is not removable", device);
2362 return;
2363 }
2364
2365 if (!blk_dev_has_tray(blk)) {
2366 /* Ignore this command on tray-less devices */
2367 return;
2368 }
2369
2370 if (!blk_dev_is_tray_open(blk)) {
2371 return;
2372 }
2373
2374 blk_dev_change_media_cb(blk, true);
2375 }
2376
2377 void qmp_x_blockdev_remove_medium(const char *device, Error **errp)
2378 {
2379 BlockBackend *blk;
2380 BlockDriverState *bs;
2381 AioContext *aio_context;
2382 bool has_device;
2383
2384 blk = blk_by_name(device);
2385 if (!blk) {
2386 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2387 "Device '%s' not found", device);
2388 return;
2389 }
2390
2391 /* For BBs without a device, we can exchange the BDS tree at will */
2392 has_device = blk_get_attached_dev(blk);
2393
2394 if (has_device && !blk_dev_has_removable_media(blk)) {
2395 error_setg(errp, "Device '%s' is not removable", device);
2396 return;
2397 }
2398
2399 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2400 error_setg(errp, "Tray of device '%s' is not open", device);
2401 return;
2402 }
2403
2404 bs = blk_bs(blk);
2405 if (!bs) {
2406 return;
2407 }
2408
2409 aio_context = bdrv_get_aio_context(bs);
2410 aio_context_acquire(aio_context);
2411
2412 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2413 goto out;
2414 }
2415
2416 /* This follows the convention established by bdrv_make_anon() */
2417 if (bs->device_list.tqe_prev) {
2418 bdrv_device_remove(bs);
2419 }
2420
2421 blk_remove_bs(blk);
2422
2423 if (!blk_dev_has_tray(blk)) {
2424 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2425 * called at all); therefore, the medium needs to be ejected here.
2426 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2427 * value passed here (i.e. false). */
2428 blk_dev_change_media_cb(blk, false);
2429 }
2430
2431 out:
2432 aio_context_release(aio_context);
2433 }
2434
2435 static void qmp_blockdev_insert_anon_medium(const char *device,
2436 BlockDriverState *bs, Error **errp)
2437 {
2438 BlockBackend *blk;
2439 bool has_device;
2440
2441 blk = blk_by_name(device);
2442 if (!blk) {
2443 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2444 "Device '%s' not found", device);
2445 return;
2446 }
2447
2448 /* For BBs without a device, we can exchange the BDS tree at will */
2449 has_device = blk_get_attached_dev(blk);
2450
2451 if (has_device && !blk_dev_has_removable_media(blk)) {
2452 error_setg(errp, "Device '%s' is not removable", device);
2453 return;
2454 }
2455
2456 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2457 error_setg(errp, "Tray of device '%s' is not open", device);
2458 return;
2459 }
2460
2461 if (blk_bs(blk)) {
2462 error_setg(errp, "There already is a medium in device '%s'", device);
2463 return;
2464 }
2465
2466 blk_insert_bs(blk, bs);
2467
2468 QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list);
2469
2470 if (!blk_dev_has_tray(blk)) {
2471 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2472 * called at all); therefore, the medium needs to be pushed into the
2473 * slot here.
2474 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2475 * value passed here (i.e. true). */
2476 blk_dev_change_media_cb(blk, true);
2477 }
2478 }
2479
2480 void qmp_x_blockdev_insert_medium(const char *device, const char *node_name,
2481 Error **errp)
2482 {
2483 BlockDriverState *bs;
2484
2485 bs = bdrv_find_node(node_name);
2486 if (!bs) {
2487 error_setg(errp, "Node '%s' not found", node_name);
2488 return;
2489 }
2490
2491 if (bs->blk) {
2492 error_setg(errp, "Node '%s' is already in use by '%s'", node_name,
2493 blk_name(bs->blk));
2494 return;
2495 }
2496
2497 qmp_blockdev_insert_anon_medium(device, bs, errp);
2498 }
2499
2500 void qmp_blockdev_change_medium(const char *device, const char *filename,
2501 bool has_format, const char *format,
2502 bool has_read_only,
2503 BlockdevChangeReadOnlyMode read_only,
2504 Error **errp)
2505 {
2506 BlockBackend *blk;
2507 BlockDriverState *medium_bs = NULL;
2508 int bdrv_flags, ret;
2509 QDict *options = NULL;
2510 Error *err = NULL;
2511
2512 blk = blk_by_name(device);
2513 if (!blk) {
2514 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2515 "Device '%s' not found", device);
2516 goto fail;
2517 }
2518
2519 if (blk_bs(blk)) {
2520 blk_update_root_state(blk);
2521 }
2522
2523 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2524 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2525 BDRV_O_PROTOCOL);
2526
2527 if (!has_read_only) {
2528 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2529 }
2530
2531 switch (read_only) {
2532 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2533 break;
2534
2535 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2536 bdrv_flags &= ~BDRV_O_RDWR;
2537 break;
2538
2539 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2540 bdrv_flags |= BDRV_O_RDWR;
2541 break;
2542
2543 default:
2544 abort();
2545 }
2546
2547 if (has_format) {
2548 options = qdict_new();
2549 qdict_put(options, "driver", qstring_from_str(format));
2550 }
2551
2552 assert(!medium_bs);
2553 ret = bdrv_open(&medium_bs, filename, NULL, options, bdrv_flags, errp);
2554 if (ret < 0) {
2555 goto fail;
2556 }
2557
2558 blk_apply_root_state(blk, medium_bs);
2559
2560 bdrv_add_key(medium_bs, NULL, &err);
2561 if (err) {
2562 error_propagate(errp, err);
2563 goto fail;
2564 }
2565
2566 qmp_blockdev_open_tray(device, false, false, &err);
2567 if (err) {
2568 error_propagate(errp, err);
2569 goto fail;
2570 }
2571
2572 qmp_x_blockdev_remove_medium(device, &err);
2573 if (err) {
2574 error_propagate(errp, err);
2575 goto fail;
2576 }
2577
2578 qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
2579 if (err) {
2580 error_propagate(errp, err);
2581 goto fail;
2582 }
2583
2584 qmp_blockdev_close_tray(device, errp);
2585
2586 fail:
2587 /* If the medium has been inserted, the device has its own reference, so
2588 * ours must be relinquished; and if it has not been inserted successfully,
2589 * the reference must be relinquished anyway */
2590 bdrv_unref(medium_bs);
2591 }
2592
2593 /* throttling disk I/O limits */
2594 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2595 int64_t bps_wr,
2596 int64_t iops,
2597 int64_t iops_rd,
2598 int64_t iops_wr,
2599 bool has_bps_max,
2600 int64_t bps_max,
2601 bool has_bps_rd_max,
2602 int64_t bps_rd_max,
2603 bool has_bps_wr_max,
2604 int64_t bps_wr_max,
2605 bool has_iops_max,
2606 int64_t iops_max,
2607 bool has_iops_rd_max,
2608 int64_t iops_rd_max,
2609 bool has_iops_wr_max,
2610 int64_t iops_wr_max,
2611 bool has_bps_max_length,
2612 int64_t bps_max_length,
2613 bool has_bps_rd_max_length,
2614 int64_t bps_rd_max_length,
2615 bool has_bps_wr_max_length,
2616 int64_t bps_wr_max_length,
2617 bool has_iops_max_length,
2618 int64_t iops_max_length,
2619 bool has_iops_rd_max_length,
2620 int64_t iops_rd_max_length,
2621 bool has_iops_wr_max_length,
2622 int64_t iops_wr_max_length,
2623 bool has_iops_size,
2624 int64_t iops_size,
2625 bool has_group,
2626 const char *group, Error **errp)
2627 {
2628 ThrottleConfig cfg;
2629 BlockDriverState *bs;
2630 BlockBackend *blk;
2631 AioContext *aio_context;
2632
2633 blk = blk_by_name(device);
2634 if (!blk) {
2635 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2636 "Device '%s' not found", device);
2637 return;
2638 }
2639
2640 aio_context = blk_get_aio_context(blk);
2641 aio_context_acquire(aio_context);
2642
2643 bs = blk_bs(blk);
2644 if (!bs) {
2645 error_setg(errp, "Device '%s' has no medium", device);
2646 goto out;
2647 }
2648
2649 throttle_config_init(&cfg);
2650 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2651 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2652 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2653
2654 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2655 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2656 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2657
2658 if (has_bps_max) {
2659 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2660 }
2661 if (has_bps_rd_max) {
2662 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2663 }
2664 if (has_bps_wr_max) {
2665 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2666 }
2667 if (has_iops_max) {
2668 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2669 }
2670 if (has_iops_rd_max) {
2671 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2672 }
2673 if (has_iops_wr_max) {
2674 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2675 }
2676
2677 if (has_bps_max_length) {
2678 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = bps_max_length;
2679 }
2680 if (has_bps_rd_max_length) {
2681 cfg.buckets[THROTTLE_BPS_READ].burst_length = bps_rd_max_length;
2682 }
2683 if (has_bps_wr_max_length) {
2684 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = bps_wr_max_length;
2685 }
2686 if (has_iops_max_length) {
2687 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = iops_max_length;
2688 }
2689 if (has_iops_rd_max_length) {
2690 cfg.buckets[THROTTLE_OPS_READ].burst_length = iops_rd_max_length;
2691 }
2692 if (has_iops_wr_max_length) {
2693 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = iops_wr_max_length;
2694 }
2695
2696 if (has_iops_size) {
2697 cfg.op_size = iops_size;
2698 }
2699
2700 if (!throttle_is_valid(&cfg, errp)) {
2701 goto out;
2702 }
2703
2704 if (throttle_enabled(&cfg)) {
2705 /* Enable I/O limits if they're not enabled yet, otherwise
2706 * just update the throttling group. */
2707 if (!bs->throttle_state) {
2708 bdrv_io_limits_enable(bs, has_group ? group : device);
2709 } else if (has_group) {
2710 bdrv_io_limits_update_group(bs, group);
2711 }
2712 /* Set the new throttling configuration */
2713 bdrv_set_io_limits(bs, &cfg);
2714 } else if (bs->throttle_state) {
2715 /* If all throttling settings are set to 0, disable I/O limits */
2716 bdrv_io_limits_disable(bs);
2717 }
2718
2719 out:
2720 aio_context_release(aio_context);
2721 }
2722
2723 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2724 bool has_granularity, uint32_t granularity,
2725 Error **errp)
2726 {
2727 AioContext *aio_context;
2728 BlockDriverState *bs;
2729
2730 if (!name || name[0] == '\0') {
2731 error_setg(errp, "Bitmap name cannot be empty");
2732 return;
2733 }
2734
2735 bs = bdrv_lookup_bs(node, node, errp);
2736 if (!bs) {
2737 return;
2738 }
2739
2740 aio_context = bdrv_get_aio_context(bs);
2741 aio_context_acquire(aio_context);
2742
2743 if (has_granularity) {
2744 if (granularity < 512 || !is_power_of_2(granularity)) {
2745 error_setg(errp, "Granularity must be power of 2 "
2746 "and at least 512");
2747 goto out;
2748 }
2749 } else {
2750 /* Default to cluster size, if available: */
2751 granularity = bdrv_get_default_bitmap_granularity(bs);
2752 }
2753
2754 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2755
2756 out:
2757 aio_context_release(aio_context);
2758 }
2759
2760 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2761 Error **errp)
2762 {
2763 AioContext *aio_context;
2764 BlockDriverState *bs;
2765 BdrvDirtyBitmap *bitmap;
2766
2767 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2768 if (!bitmap || !bs) {
2769 return;
2770 }
2771
2772 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2773 error_setg(errp,
2774 "Bitmap '%s' is currently frozen and cannot be removed",
2775 name);
2776 goto out;
2777 }
2778 bdrv_dirty_bitmap_make_anon(bitmap);
2779 bdrv_release_dirty_bitmap(bs, bitmap);
2780
2781 out:
2782 aio_context_release(aio_context);
2783 }
2784
2785 /**
2786 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2787 * immediately after a full backup operation.
2788 */
2789 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2790 Error **errp)
2791 {
2792 AioContext *aio_context;
2793 BdrvDirtyBitmap *bitmap;
2794 BlockDriverState *bs;
2795
2796 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2797 if (!bitmap || !bs) {
2798 return;
2799 }
2800
2801 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2802 error_setg(errp,
2803 "Bitmap '%s' is currently frozen and cannot be modified",
2804 name);
2805 goto out;
2806 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2807 error_setg(errp,
2808 "Bitmap '%s' is currently disabled and cannot be cleared",
2809 name);
2810 goto out;
2811 }
2812
2813 bdrv_clear_dirty_bitmap(bitmap, NULL);
2814
2815 out:
2816 aio_context_release(aio_context);
2817 }
2818
2819 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2820 {
2821 const char *id = qdict_get_str(qdict, "id");
2822 BlockBackend *blk;
2823 BlockDriverState *bs;
2824 AioContext *aio_context;
2825 Error *local_err = NULL;
2826
2827 bs = bdrv_find_node(id);
2828 if (bs) {
2829 qmp_x_blockdev_del(false, NULL, true, id, &local_err);
2830 if (local_err) {
2831 error_report_err(local_err);
2832 }
2833 return;
2834 }
2835
2836 blk = blk_by_name(id);
2837 if (!blk) {
2838 error_report("Device '%s' not found", id);
2839 return;
2840 }
2841
2842 if (!blk_legacy_dinfo(blk)) {
2843 error_report("Deleting device added with blockdev-add"
2844 " is not supported");
2845 return;
2846 }
2847
2848 aio_context = blk_get_aio_context(blk);
2849 aio_context_acquire(aio_context);
2850
2851 bs = blk_bs(blk);
2852 if (bs) {
2853 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2854 error_report_err(local_err);
2855 aio_context_release(aio_context);
2856 return;
2857 }
2858
2859 blk_remove_bs(blk);
2860 }
2861
2862 /* if we have a device attached to this BlockDriverState
2863 * then we need to make the drive anonymous until the device
2864 * can be removed. If this is a drive with no device backing
2865 * then we can just get rid of the block driver state right here.
2866 */
2867 if (blk_get_attached_dev(blk)) {
2868 blk_hide_on_behalf_of_hmp_drive_del(blk);
2869 /* Further I/O must not pause the guest */
2870 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2871 BLOCKDEV_ON_ERROR_REPORT);
2872 } else {
2873 blk_unref(blk);
2874 }
2875
2876 aio_context_release(aio_context);
2877 }
2878
2879 void qmp_block_resize(bool has_device, const char *device,
2880 bool has_node_name, const char *node_name,
2881 int64_t size, Error **errp)
2882 {
2883 Error *local_err = NULL;
2884 BlockDriverState *bs;
2885 AioContext *aio_context;
2886 int ret;
2887
2888 bs = bdrv_lookup_bs(has_device ? device : NULL,
2889 has_node_name ? node_name : NULL,
2890 &local_err);
2891 if (local_err) {
2892 error_propagate(errp, local_err);
2893 return;
2894 }
2895
2896 aio_context = bdrv_get_aio_context(bs);
2897 aio_context_acquire(aio_context);
2898
2899 if (!bdrv_is_first_non_filter(bs)) {
2900 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2901 goto out;
2902 }
2903
2904 if (size < 0) {
2905 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2906 goto out;
2907 }
2908
2909 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2910 error_setg(errp, QERR_DEVICE_IN_USE, device);
2911 goto out;
2912 }
2913
2914 /* complete all in-flight operations before resizing the device */
2915 bdrv_drain_all();
2916
2917 ret = bdrv_truncate(bs, size);
2918 switch (ret) {
2919 case 0:
2920 break;
2921 case -ENOMEDIUM:
2922 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2923 break;
2924 case -ENOTSUP:
2925 error_setg(errp, QERR_UNSUPPORTED);
2926 break;
2927 case -EACCES:
2928 error_setg(errp, "Device '%s' is read only", device);
2929 break;
2930 case -EBUSY:
2931 error_setg(errp, QERR_DEVICE_IN_USE, device);
2932 break;
2933 default:
2934 error_setg_errno(errp, -ret, "Could not resize");
2935 break;
2936 }
2937
2938 out:
2939 aio_context_release(aio_context);
2940 }
2941
2942 static void block_job_cb(void *opaque, int ret)
2943 {
2944 /* Note that this function may be executed from another AioContext besides
2945 * the QEMU main loop. If you need to access anything that assumes the
2946 * QEMU global mutex, use a BH or introduce a mutex.
2947 */
2948
2949 BlockDriverState *bs = opaque;
2950 const char *msg = NULL;
2951
2952 trace_block_job_cb(bs, bs->job, ret);
2953
2954 assert(bs->job);
2955
2956 if (ret < 0) {
2957 msg = strerror(-ret);
2958 }
2959
2960 if (block_job_is_cancelled(bs->job)) {
2961 block_job_event_cancelled(bs->job);
2962 } else {
2963 block_job_event_completed(bs->job, msg);
2964 }
2965 }
2966
2967 void qmp_block_stream(const char *device,
2968 bool has_base, const char *base,
2969 bool has_backing_file, const char *backing_file,
2970 bool has_speed, int64_t speed,
2971 bool has_on_error, BlockdevOnError on_error,
2972 Error **errp)
2973 {
2974 BlockBackend *blk;
2975 BlockDriverState *bs;
2976 BlockDriverState *base_bs = NULL;
2977 AioContext *aio_context;
2978 Error *local_err = NULL;
2979 const char *base_name = NULL;
2980
2981 if (!has_on_error) {
2982 on_error = BLOCKDEV_ON_ERROR_REPORT;
2983 }
2984
2985 blk = blk_by_name(device);
2986 if (!blk) {
2987 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2988 "Device '%s' not found", device);
2989 return;
2990 }
2991
2992 aio_context = blk_get_aio_context(blk);
2993 aio_context_acquire(aio_context);
2994
2995 if (!blk_is_available(blk)) {
2996 error_setg(errp, "Device '%s' has no medium", device);
2997 goto out;
2998 }
2999 bs = blk_bs(blk);
3000
3001 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
3002 goto out;
3003 }
3004
3005 if (has_base) {
3006 base_bs = bdrv_find_backing_image(bs, base);
3007 if (base_bs == NULL) {
3008 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3009 goto out;
3010 }
3011 assert(bdrv_get_aio_context(base_bs) == aio_context);
3012 base_name = base;
3013 }
3014
3015 /* if we are streaming the entire chain, the result will have no backing
3016 * file, and specifying one is therefore an error */
3017 if (base_bs == NULL && has_backing_file) {
3018 error_setg(errp, "backing file specified, but streaming the "
3019 "entire chain");
3020 goto out;
3021 }
3022
3023 /* backing_file string overrides base bs filename */
3024 base_name = has_backing_file ? backing_file : base_name;
3025
3026 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
3027 on_error, block_job_cb, bs, &local_err);
3028 if (local_err) {
3029 error_propagate(errp, local_err);
3030 goto out;
3031 }
3032
3033 trace_qmp_block_stream(bs, bs->job);
3034
3035 out:
3036 aio_context_release(aio_context);
3037 }
3038
3039 void qmp_block_commit(const char *device,
3040 bool has_base, const char *base,
3041 bool has_top, const char *top,
3042 bool has_backing_file, const char *backing_file,
3043 bool has_speed, int64_t speed,
3044 Error **errp)
3045 {
3046 BlockBackend *blk;
3047 BlockDriverState *bs;
3048 BlockDriverState *base_bs, *top_bs;
3049 AioContext *aio_context;
3050 Error *local_err = NULL;
3051 /* This will be part of the QMP command, if/when the
3052 * BlockdevOnError change for blkmirror makes it in
3053 */
3054 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3055
3056 if (!has_speed) {
3057 speed = 0;
3058 }
3059
3060 /* Important Note:
3061 * libvirt relies on the DeviceNotFound error class in order to probe for
3062 * live commit feature versions; for this to work, we must make sure to
3063 * perform the device lookup before any generic errors that may occur in a
3064 * scenario in which all optional arguments are omitted. */
3065 blk = blk_by_name(device);
3066 if (!blk) {
3067 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3068 "Device '%s' not found", device);
3069 return;
3070 }
3071
3072 aio_context = blk_get_aio_context(blk);
3073 aio_context_acquire(aio_context);
3074
3075 if (!blk_is_available(blk)) {
3076 error_setg(errp, "Device '%s' has no medium", device);
3077 goto out;
3078 }
3079 bs = blk_bs(blk);
3080
3081 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3082 goto out;
3083 }
3084
3085 /* default top_bs is the active layer */
3086 top_bs = bs;
3087
3088 if (has_top && top) {
3089 if (strcmp(bs->filename, top) != 0) {
3090 top_bs = bdrv_find_backing_image(bs, top);
3091 }
3092 }
3093
3094 if (top_bs == NULL) {
3095 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3096 goto out;
3097 }
3098
3099 assert(bdrv_get_aio_context(top_bs) == aio_context);
3100
3101 if (has_base && base) {
3102 base_bs = bdrv_find_backing_image(top_bs, base);
3103 } else {
3104 base_bs = bdrv_find_base(top_bs);
3105 }
3106
3107 if (base_bs == NULL) {
3108 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3109 goto out;
3110 }
3111
3112 assert(bdrv_get_aio_context(base_bs) == aio_context);
3113
3114 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3115 goto out;
3116 }
3117
3118 /* Do not allow attempts to commit an image into itself */
3119 if (top_bs == base_bs) {
3120 error_setg(errp, "cannot commit an image into itself");
3121 goto out;
3122 }
3123
3124 if (top_bs == bs) {
3125 if (has_backing_file) {
3126 error_setg(errp, "'backing-file' specified,"
3127 " but 'top' is the active layer");
3128 goto out;
3129 }
3130 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
3131 bs, &local_err);
3132 } else {
3133 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
3134 has_backing_file ? backing_file : NULL, &local_err);
3135 }
3136 if (local_err != NULL) {
3137 error_propagate(errp, local_err);
3138 goto out;
3139 }
3140
3141 out:
3142 aio_context_release(aio_context);
3143 }
3144
3145 static void do_drive_backup(const char *device, const char *target,
3146 bool has_format, const char *format,
3147 enum MirrorSyncMode sync,
3148 bool has_mode, enum NewImageMode mode,
3149 bool has_speed, int64_t speed,
3150 bool has_bitmap, const char *bitmap,
3151 bool has_on_source_error,
3152 BlockdevOnError on_source_error,
3153 bool has_on_target_error,
3154 BlockdevOnError on_target_error,
3155 BlockJobTxn *txn, Error **errp)
3156 {
3157 BlockBackend *blk;
3158 BlockDriverState *bs;
3159 BlockDriverState *target_bs;
3160 BlockDriverState *source = NULL;
3161 BdrvDirtyBitmap *bmap = NULL;
3162 AioContext *aio_context;
3163 QDict *options = NULL;
3164 Error *local_err = NULL;
3165 int flags;
3166 int64_t size;
3167 int ret;
3168
3169 if (!has_speed) {
3170 speed = 0;
3171 }
3172 if (!has_on_source_error) {
3173 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3174 }
3175 if (!has_on_target_error) {
3176 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3177 }
3178 if (!has_mode) {
3179 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3180 }
3181
3182 blk = blk_by_name(device);
3183 if (!blk) {
3184 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3185 "Device '%s' not found", device);
3186 return;
3187 }
3188
3189 aio_context = blk_get_aio_context(blk);
3190 aio_context_acquire(aio_context);
3191
3192 /* Although backup_run has this check too, we need to use bs->drv below, so
3193 * do an early check redundantly. */
3194 if (!blk_is_available(blk)) {
3195 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3196 goto out;
3197 }
3198 bs = blk_bs(blk);
3199
3200 if (!has_format) {
3201 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3202 }
3203
3204 /* Early check to avoid creating target */
3205 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3206 goto out;
3207 }
3208
3209 flags = bs->open_flags | BDRV_O_RDWR;
3210
3211 /* See if we have a backing HD we can use to create our new image
3212 * on top of. */
3213 if (sync == MIRROR_SYNC_MODE_TOP) {
3214 source = backing_bs(bs);
3215 if (!source) {
3216 sync = MIRROR_SYNC_MODE_FULL;
3217 }
3218 }
3219 if (sync == MIRROR_SYNC_MODE_NONE) {
3220 source = bs;
3221 }
3222
3223 size = bdrv_getlength(bs);
3224 if (size < 0) {
3225 error_setg_errno(errp, -size, "bdrv_getlength failed");
3226 goto out;
3227 }
3228
3229 if (mode != NEW_IMAGE_MODE_EXISTING) {
3230 assert(format);
3231 if (source) {
3232 bdrv_img_create(target, format, source->filename,
3233 source->drv->format_name, NULL,
3234 size, flags, &local_err, false);
3235 } else {
3236 bdrv_img_create(target, format, NULL, NULL, NULL,
3237 size, flags, &local_err, false);
3238 }
3239 }
3240
3241 if (local_err) {
3242 error_propagate(errp, local_err);
3243 goto out;
3244 }
3245
3246 if (format) {
3247 options = qdict_new();
3248 qdict_put(options, "driver", qstring_from_str(format));
3249 }
3250
3251 target_bs = NULL;
3252 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
3253 if (ret < 0) {
3254 error_propagate(errp, local_err);
3255 goto out;
3256 }
3257
3258 bdrv_set_aio_context(target_bs, aio_context);
3259
3260 if (has_bitmap) {
3261 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
3262 if (!bmap) {
3263 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
3264 bdrv_unref(target_bs);
3265 goto out;
3266 }
3267 }
3268
3269 backup_start(bs, target_bs, speed, sync, bmap,
3270 on_source_error, on_target_error,
3271 block_job_cb, bs, txn, &local_err);
3272 if (local_err != NULL) {
3273 bdrv_unref(target_bs);
3274 error_propagate(errp, local_err);
3275 goto out;
3276 }
3277
3278 out:
3279 aio_context_release(aio_context);
3280 }
3281
3282 void qmp_drive_backup(const char *device, const char *target,
3283 bool has_format, const char *format,
3284 enum MirrorSyncMode sync,
3285 bool has_mode, enum NewImageMode mode,
3286 bool has_speed, int64_t speed,
3287 bool has_bitmap, const char *bitmap,
3288 bool has_on_source_error, BlockdevOnError on_source_error,
3289 bool has_on_target_error, BlockdevOnError on_target_error,
3290 Error **errp)
3291 {
3292 return do_drive_backup(device, target, has_format, format, sync,
3293 has_mode, mode, has_speed, speed,
3294 has_bitmap, bitmap,
3295 has_on_source_error, on_source_error,
3296 has_on_target_error, on_target_error,
3297 NULL, errp);
3298 }
3299
3300 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3301 {
3302 return bdrv_named_nodes_list(errp);
3303 }
3304
3305 void do_blockdev_backup(const char *device, const char *target,
3306 enum MirrorSyncMode sync,
3307 bool has_speed, int64_t speed,
3308 bool has_on_source_error,
3309 BlockdevOnError on_source_error,
3310 bool has_on_target_error,
3311 BlockdevOnError on_target_error,
3312 BlockJobTxn *txn, Error **errp)
3313 {
3314 BlockBackend *blk, *target_blk;
3315 BlockDriverState *bs;
3316 BlockDriverState *target_bs;
3317 Error *local_err = NULL;
3318 AioContext *aio_context;
3319
3320 if (!has_speed) {
3321 speed = 0;
3322 }
3323 if (!has_on_source_error) {
3324 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3325 }
3326 if (!has_on_target_error) {
3327 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3328 }
3329
3330 blk = blk_by_name(device);
3331 if (!blk) {
3332 error_setg(errp, "Device '%s' not found", device);
3333 return;
3334 }
3335
3336 aio_context = blk_get_aio_context(blk);
3337 aio_context_acquire(aio_context);
3338
3339 if (!blk_is_available(blk)) {
3340 error_setg(errp, "Device '%s' has no medium", device);
3341 goto out;
3342 }
3343 bs = blk_bs(blk);
3344
3345 target_blk = blk_by_name(target);
3346 if (!target_blk) {
3347 error_setg(errp, "Device '%s' not found", target);
3348 goto out;
3349 }
3350
3351 if (!blk_is_available(target_blk)) {
3352 error_setg(errp, "Device '%s' has no medium", target);
3353 goto out;
3354 }
3355 target_bs = blk_bs(target_blk);
3356
3357 bdrv_ref(target_bs);
3358 bdrv_set_aio_context(target_bs, aio_context);
3359 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
3360 on_target_error, block_job_cb, bs, txn, &local_err);
3361 if (local_err != NULL) {
3362 bdrv_unref(target_bs);
3363 error_propagate(errp, local_err);
3364 }
3365 out:
3366 aio_context_release(aio_context);
3367 }
3368
3369 void qmp_blockdev_backup(const char *device, const char *target,
3370 enum MirrorSyncMode sync,
3371 bool has_speed, int64_t speed,
3372 bool has_on_source_error,
3373 BlockdevOnError on_source_error,
3374 bool has_on_target_error,
3375 BlockdevOnError on_target_error,
3376 Error **errp)
3377 {
3378 do_blockdev_backup(device, target, sync, has_speed, speed,
3379 has_on_source_error, on_source_error,
3380 has_on_target_error, on_target_error,
3381 NULL, errp);
3382 }
3383
3384 /* Parameter check and block job starting for drive mirroring.
3385 * Caller should hold @device and @target's aio context (must be the same).
3386 **/
3387 static void blockdev_mirror_common(BlockDriverState *bs,
3388 BlockDriverState *target,
3389 bool has_replaces, const char *replaces,
3390 enum MirrorSyncMode sync,
3391 bool has_speed, int64_t speed,
3392 bool has_granularity, uint32_t granularity,
3393 bool has_buf_size, int64_t buf_size,
3394 bool has_on_source_error,
3395 BlockdevOnError on_source_error,
3396 bool has_on_target_error,
3397 BlockdevOnError on_target_error,
3398 bool has_unmap, bool unmap,
3399 Error **errp)
3400 {
3401
3402 if (!has_speed) {
3403 speed = 0;
3404 }
3405 if (!has_on_source_error) {
3406 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3407 }
3408 if (!has_on_target_error) {
3409 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3410 }
3411 if (!has_granularity) {
3412 granularity = 0;
3413 }
3414 if (!has_buf_size) {
3415 buf_size = 0;
3416 }
3417 if (!has_unmap) {
3418 unmap = true;
3419 }
3420
3421 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3422 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3423 "a value in range [512B, 64MB]");
3424 return;
3425 }
3426 if (granularity & (granularity - 1)) {
3427 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3428 "power of 2");
3429 return;
3430 }
3431
3432 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3433 return;
3434 }
3435 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3436 return;
3437 }
3438 if (target->blk) {
3439 error_setg(errp, "Cannot mirror to an attached block device");
3440 return;
3441 }
3442
3443 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3444 sync = MIRROR_SYNC_MODE_FULL;
3445 }
3446
3447 /* pass the node name to replace to mirror start since it's loose coupling
3448 * and will allow to check whether the node still exist at mirror completion
3449 */
3450 mirror_start(bs, target,
3451 has_replaces ? replaces : NULL,
3452 speed, granularity, buf_size, sync,
3453 on_source_error, on_target_error, unmap,
3454 block_job_cb, bs, errp);
3455 }
3456
3457 void qmp_drive_mirror(const char *device, const char *target,
3458 bool has_format, const char *format,
3459 bool has_node_name, const char *node_name,
3460 bool has_replaces, const char *replaces,
3461 enum MirrorSyncMode sync,
3462 bool has_mode, enum NewImageMode mode,
3463 bool has_speed, int64_t speed,
3464 bool has_granularity, uint32_t granularity,
3465 bool has_buf_size, int64_t buf_size,
3466 bool has_on_source_error, BlockdevOnError on_source_error,
3467 bool has_on_target_error, BlockdevOnError on_target_error,
3468 bool has_unmap, bool unmap,
3469 Error **errp)
3470 {
3471 BlockDriverState *bs;
3472 BlockBackend *blk;
3473 BlockDriverState *source, *target_bs;
3474 AioContext *aio_context;
3475 Error *local_err = NULL;
3476 QDict *options = NULL;
3477 int flags;
3478 int64_t size;
3479 int ret;
3480
3481 blk = blk_by_name(device);
3482 if (!blk) {
3483 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3484 "Device '%s' not found", device);
3485 return;
3486 }
3487
3488 aio_context = blk_get_aio_context(blk);
3489 aio_context_acquire(aio_context);
3490
3491 if (!blk_is_available(blk)) {
3492 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3493 goto out;
3494 }
3495 bs = blk_bs(blk);
3496 if (!has_mode) {
3497 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3498 }
3499
3500 if (!has_format) {
3501 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3502 }
3503
3504 flags = bs->open_flags | BDRV_O_RDWR;
3505 source = backing_bs(bs);
3506 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3507 sync = MIRROR_SYNC_MODE_FULL;
3508 }
3509 if (sync == MIRROR_SYNC_MODE_NONE) {
3510 source = bs;
3511 }
3512
3513 size = bdrv_getlength(bs);
3514 if (size < 0) {
3515 error_setg_errno(errp, -size, "bdrv_getlength failed");
3516 goto out;
3517 }
3518
3519 if (has_replaces) {
3520 BlockDriverState *to_replace_bs;
3521 AioContext *replace_aio_context;
3522 int64_t replace_size;
3523
3524 if (!has_node_name) {
3525 error_setg(errp, "a node-name must be provided when replacing a"
3526 " named node of the graph");
3527 goto out;
3528 }
3529
3530 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3531
3532 if (!to_replace_bs) {
3533 error_propagate(errp, local_err);
3534 goto out;
3535 }
3536
3537 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3538 aio_context_acquire(replace_aio_context);
3539 replace_size = bdrv_getlength(to_replace_bs);
3540 aio_context_release(replace_aio_context);
3541
3542 if (size != replace_size) {
3543 error_setg(errp, "cannot replace image with a mirror image of "
3544 "different size");
3545 goto out;
3546 }
3547 }
3548
3549 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3550 && mode != NEW_IMAGE_MODE_EXISTING)
3551 {
3552 /* create new image w/o backing file */
3553 assert(format);
3554 bdrv_img_create(target, format,
3555 NULL, NULL, NULL, size, flags, &local_err, false);
3556 } else {
3557 switch (mode) {
3558 case NEW_IMAGE_MODE_EXISTING:
3559 break;
3560 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3561 /* create new image with backing file */
3562 bdrv_img_create(target, format,
3563 source->filename,
3564 source->drv->format_name,
3565 NULL, size, flags, &local_err, false);
3566 break;
3567 default:
3568 abort();
3569 }
3570 }
3571
3572 if (local_err) {
3573 error_propagate(errp, local_err);
3574 goto out;
3575 }
3576
3577 options = qdict_new();
3578 if (has_node_name) {
3579 qdict_put(options, "node-name", qstring_from_str(node_name));
3580 }
3581 if (format) {
3582 qdict_put(options, "driver", qstring_from_str(format));
3583 }
3584
3585 /* Mirroring takes care of copy-on-write using the source's backing
3586 * file.
3587 */
3588 target_bs = NULL;
3589 ret = bdrv_open(&target_bs, target, NULL, options,
3590 flags | BDRV_O_NO_BACKING, &local_err);
3591 if (ret < 0) {
3592 error_propagate(errp, local_err);
3593 goto out;
3594 }
3595
3596 bdrv_set_aio_context(target_bs, aio_context);
3597
3598 blockdev_mirror_common(bs, target_bs,
3599 has_replaces, replaces, sync,
3600 has_speed, speed,
3601 has_granularity, granularity,
3602 has_buf_size, buf_size,
3603 has_on_source_error, on_source_error,
3604 has_on_target_error, on_target_error,
3605 has_unmap, unmap,
3606 &local_err);
3607 if (local_err) {
3608 error_propagate(errp, local_err);
3609 bdrv_unref(target_bs);
3610 }
3611 out:
3612 aio_context_release(aio_context);
3613 }
3614
3615 void qmp_blockdev_mirror(const char *device, const char *target,
3616 bool has_replaces, const char *replaces,
3617 MirrorSyncMode sync,
3618 bool has_speed, int64_t speed,
3619 bool has_granularity, uint32_t granularity,
3620 bool has_buf_size, int64_t buf_size,
3621 bool has_on_source_error,
3622 BlockdevOnError on_source_error,
3623 bool has_on_target_error,
3624 BlockdevOnError on_target_error,
3625 Error **errp)
3626 {
3627 BlockDriverState *bs;
3628 BlockBackend *blk;
3629 BlockDriverState *target_bs;
3630 AioContext *aio_context;
3631 Error *local_err = NULL;
3632
3633 blk = blk_by_name(device);
3634 if (!blk) {
3635 error_setg(errp, "Device '%s' not found", device);
3636 return;
3637 }
3638 bs = blk_bs(blk);
3639
3640 if (!bs) {
3641 error_setg(errp, "Device '%s' has no media", device);
3642 return;
3643 }
3644
3645 target_bs = bdrv_lookup_bs(target, target, errp);
3646 if (!target_bs) {
3647 return;
3648 }
3649
3650 aio_context = bdrv_get_aio_context(bs);
3651 aio_context_acquire(aio_context);
3652
3653 bdrv_ref(target_bs);
3654 bdrv_set_aio_context(target_bs, aio_context);
3655
3656 blockdev_mirror_common(bs, target_bs,
3657 has_replaces, replaces, sync,
3658 has_speed, speed,
3659 has_granularity, granularity,
3660 has_buf_size, buf_size,
3661 has_on_source_error, on_source_error,
3662 has_on_target_error, on_target_error,
3663 true, true,
3664 &local_err);
3665 if (local_err) {
3666 error_propagate(errp, local_err);
3667 bdrv_unref(target_bs);
3668 }
3669
3670 aio_context_release(aio_context);
3671 }
3672
3673 /* Get the block job for a given device name and acquire its AioContext */
3674 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3675 Error **errp)
3676 {
3677 BlockBackend *blk;
3678 BlockDriverState *bs;
3679
3680 *aio_context = NULL;
3681
3682 blk = blk_by_name(device);
3683 if (!blk) {
3684 goto notfound;
3685 }
3686
3687 *aio_context = blk_get_aio_context(blk);
3688 aio_context_acquire(*aio_context);
3689
3690 if (!blk_is_available(blk)) {
3691 goto notfound;
3692 }
3693 bs = blk_bs(blk);
3694
3695 if (!bs->job) {
3696 goto notfound;
3697 }
3698
3699 return bs->job;
3700
3701 notfound:
3702 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3703 "No active block job on device '%s'", device);
3704 if (*aio_context) {
3705 aio_context_release(*aio_context);
3706 *aio_context = NULL;
3707 }
3708 return NULL;
3709 }
3710
3711 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3712 {
3713 AioContext *aio_context;
3714 BlockJob *job = find_block_job(device, &aio_context, errp);
3715
3716 if (!job) {
3717 return;
3718 }
3719
3720 block_job_set_speed(job, speed, errp);
3721 aio_context_release(aio_context);
3722 }
3723
3724 void qmp_block_job_cancel(const char *device,
3725 bool has_force, bool force, Error **errp)
3726 {
3727 AioContext *aio_context;
3728 BlockJob *job = find_block_job(device, &aio_context, errp);
3729
3730 if (!job) {
3731 return;
3732 }
3733
3734 if (!has_force) {
3735 force = false;
3736 }
3737
3738 if (job->user_paused && !force) {
3739 error_setg(errp, "The block job for device '%s' is currently paused",
3740 device);
3741 goto out;
3742 }
3743
3744 trace_qmp_block_job_cancel(job);
3745 block_job_cancel(job);
3746 out:
3747 aio_context_release(aio_context);
3748 }
3749
3750 void qmp_block_job_pause(const char *device, Error **errp)
3751 {
3752 AioContext *aio_context;
3753 BlockJob *job = find_block_job(device, &aio_context, errp);
3754
3755 if (!job || job->user_paused) {
3756 return;
3757 }
3758
3759 job->user_paused = true;
3760 trace_qmp_block_job_pause(job);
3761 block_job_pause(job);
3762 aio_context_release(aio_context);
3763 }
3764
3765 void qmp_block_job_resume(const char *device, Error **errp)
3766 {
3767 AioContext *aio_context;
3768 BlockJob *job = find_block_job(device, &aio_context, errp);
3769
3770 if (!job || !job->user_paused) {
3771 return;
3772 }
3773
3774 job->user_paused = false;
3775 trace_qmp_block_job_resume(job);
3776 block_job_resume(job);
3777 aio_context_release(aio_context);
3778 }
3779
3780 void qmp_block_job_complete(const char *device, Error **errp)
3781 {
3782 AioContext *aio_context;
3783 BlockJob *job = find_block_job(device, &aio_context, errp);
3784
3785 if (!job) {
3786 return;
3787 }
3788
3789 trace_qmp_block_job_complete(job);
3790 block_job_complete(job, errp);
3791 aio_context_release(aio_context);
3792 }
3793
3794 void qmp_change_backing_file(const char *device,
3795 const char *image_node_name,
3796 const char *backing_file,
3797 Error **errp)
3798 {
3799 BlockBackend *blk;
3800 BlockDriverState *bs = NULL;
3801 AioContext *aio_context;
3802 BlockDriverState *image_bs = NULL;
3803 Error *local_err = NULL;
3804 bool ro;
3805 int open_flags;
3806 int ret;
3807
3808 blk = blk_by_name(device);
3809 if (!blk) {
3810 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3811 "Device '%s' not found", device);
3812 return;
3813 }
3814
3815 aio_context = blk_get_aio_context(blk);
3816 aio_context_acquire(aio_context);
3817
3818 if (!blk_is_available(blk)) {
3819 error_setg(errp, "Device '%s' has no medium", device);
3820 goto out;
3821 }
3822 bs = blk_bs(blk);
3823
3824 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3825 if (local_err) {
3826 error_propagate(errp, local_err);
3827 goto out;
3828 }
3829
3830 if (!image_bs) {
3831 error_setg(errp, "image file not found");
3832 goto out;
3833 }
3834
3835 if (bdrv_find_base(image_bs) == image_bs) {
3836 error_setg(errp, "not allowing backing file change on an image "
3837 "without a backing file");
3838 goto out;
3839 }
3840
3841 /* even though we are not necessarily operating on bs, we need it to
3842 * determine if block ops are currently prohibited on the chain */
3843 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3844 goto out;
3845 }
3846
3847 /* final sanity check */
3848 if (!bdrv_chain_contains(bs, image_bs)) {
3849 error_setg(errp, "'%s' and image file are not in the same chain",
3850 device);
3851 goto out;
3852 }
3853
3854 /* if not r/w, reopen to make r/w */
3855 open_flags = image_bs->open_flags;
3856 ro = bdrv_is_read_only(image_bs);
3857
3858 if (ro) {
3859 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3860 if (local_err) {
3861 error_propagate(errp, local_err);
3862 goto out;
3863 }
3864 }
3865
3866 ret = bdrv_change_backing_file(image_bs, backing_file,
3867 image_bs->drv ? image_bs->drv->format_name : "");
3868
3869 if (ret < 0) {
3870 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3871 backing_file);
3872 /* don't exit here, so we can try to restore open flags if
3873 * appropriate */
3874 }
3875
3876 if (ro) {
3877 bdrv_reopen(image_bs, open_flags, &local_err);
3878 if (local_err) {
3879 error_propagate(errp, local_err); /* will preserve prior errp */
3880 }
3881 }
3882
3883 out:
3884 aio_context_release(aio_context);
3885 }
3886
3887 void hmp_drive_add_node(Monitor *mon, const char *optstr)
3888 {
3889 QemuOpts *opts;
3890 QDict *qdict;
3891 Error *local_err = NULL;
3892
3893 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
3894 if (!opts) {
3895 return;
3896 }
3897
3898 qdict = qemu_opts_to_qdict(opts, NULL);
3899
3900 if (!qdict_get_try_str(qdict, "node-name")) {
3901 error_report("'node-name' needs to be specified");
3902 goto out;
3903 }
3904
3905 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
3906 if (!bs) {
3907 error_report_err(local_err);
3908 goto out;
3909 }
3910
3911 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3912
3913 out:
3914 qemu_opts_del(opts);
3915 }
3916
3917 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3918 {
3919 QmpOutputVisitor *ov = qmp_output_visitor_new();
3920 BlockDriverState *bs;
3921 BlockBackend *blk = NULL;
3922 QObject *obj;
3923 QDict *qdict;
3924 Error *local_err = NULL;
3925
3926 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3927 * cache.direct=false instead of silently switching to aio=threads, except
3928 * when called from drive_new().
3929 *
3930 * For now, simply forbidding the combination for all drivers will do. */
3931 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3932 bool direct = options->has_cache &&
3933 options->cache->has_direct &&
3934 options->cache->direct;
3935 if (!direct) {
3936 error_setg(errp, "aio=native requires cache.direct=true");
3937 goto fail;
3938 }
3939 }
3940
3941 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), NULL, &options,
3942 &local_err);
3943 if (local_err) {
3944 error_propagate(errp, local_err);
3945 goto fail;
3946 }
3947
3948 obj = qmp_output_get_qobject(ov);
3949 qdict = qobject_to_qdict(obj);
3950
3951 qdict_flatten(qdict);
3952
3953 if (options->has_id) {
3954 blk = blockdev_init(NULL, qdict, &local_err);
3955 if (local_err) {
3956 error_propagate(errp, local_err);
3957 goto fail;
3958 }
3959
3960 bs = blk_bs(blk);
3961 } else {
3962 if (!qdict_get_try_str(qdict, "node-name")) {
3963 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3964 "the root node");
3965 goto fail;
3966 }
3967
3968 bs = bds_tree_init(qdict, errp);
3969 if (!bs) {
3970 goto fail;
3971 }
3972
3973 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3974 }
3975
3976 if (bs && bdrv_key_required(bs)) {
3977 if (blk) {
3978 blk_unref(blk);
3979 } else {
3980 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3981 bdrv_unref(bs);
3982 }
3983 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3984 goto fail;
3985 }
3986
3987 fail:
3988 qmp_output_visitor_cleanup(ov);
3989 }
3990
3991 void qmp_x_blockdev_del(bool has_id, const char *id,
3992 bool has_node_name, const char *node_name, Error **errp)
3993 {
3994 AioContext *aio_context;
3995 BlockBackend *blk;
3996 BlockDriverState *bs;
3997
3998 if (has_id && has_node_name) {
3999 error_setg(errp, "Only one of id and node-name must be specified");
4000 return;
4001 } else if (!has_id && !has_node_name) {
4002 error_setg(errp, "No block device specified");
4003 return;
4004 }
4005
4006 if (has_id) {
4007 blk = blk_by_name(id);
4008 if (!blk) {
4009 error_setg(errp, "Cannot find block backend %s", id);
4010 return;
4011 }
4012 if (blk_get_refcnt(blk) > 1) {
4013 error_setg(errp, "Block backend %s is in use", id);
4014 return;
4015 }
4016 bs = blk_bs(blk);
4017 aio_context = blk_get_aio_context(blk);
4018 } else {
4019 bs = bdrv_find_node(node_name);
4020 if (!bs) {
4021 error_setg(errp, "Cannot find node %s", node_name);
4022 return;
4023 }
4024 blk = bs->blk;
4025 if (blk) {
4026 error_setg(errp, "Node %s is in use by %s",
4027 node_name, blk_name(blk));
4028 return;
4029 }
4030 aio_context = bdrv_get_aio_context(bs);
4031 }
4032
4033 aio_context_acquire(aio_context);
4034
4035 if (bs) {
4036 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4037 goto out;
4038 }
4039
4040 if (!blk && !bs->monitor_list.tqe_prev) {
4041 error_setg(errp, "Node %s is not owned by the monitor",
4042 bs->node_name);
4043 goto out;
4044 }
4045
4046 if (bs->refcnt > 1) {
4047 error_setg(errp, "Block device %s is in use",
4048 bdrv_get_device_or_node_name(bs));
4049 goto out;
4050 }
4051 }
4052
4053 if (blk) {
4054 blk_unref(blk);
4055 } else {
4056 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4057 bdrv_unref(bs);
4058 }
4059
4060 out:
4061 aio_context_release(aio_context);
4062 }
4063
4064 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4065 {
4066 BlockJobInfoList *head = NULL, **p_next = &head;
4067 BlockDriverState *bs;
4068
4069 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
4070 AioContext *aio_context = bdrv_get_aio_context(bs);
4071
4072 aio_context_acquire(aio_context);
4073
4074 if (bs->job) {
4075 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
4076 elem->value = block_job_query(bs->job);
4077 *p_next = elem;
4078 p_next = &elem->next;
4079 }
4080
4081 aio_context_release(aio_context);
4082 }
4083
4084 return head;
4085 }
4086
4087 QemuOptsList qemu_common_drive_opts = {
4088 .name = "drive",
4089 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4090 .desc = {
4091 {
4092 .name = "snapshot",
4093 .type = QEMU_OPT_BOOL,
4094 .help = "enable/disable snapshot mode",
4095 },{
4096 .name = "discard",
4097 .type = QEMU_OPT_STRING,
4098 .help = "discard operation (ignore/off, unmap/on)",
4099 },{
4100 .name = "aio",
4101 .type = QEMU_OPT_STRING,
4102 .help = "host AIO implementation (threads, native)",
4103 },{
4104 .name = "format",
4105 .type = QEMU_OPT_STRING,
4106 .help = "disk format (raw, qcow2, ...)",
4107 },{
4108 .name = "rerror",
4109 .type = QEMU_OPT_STRING,
4110 .help = "read error action",
4111 },{
4112 .name = "werror",
4113 .type = QEMU_OPT_STRING,
4114 .help = "write error action",
4115 },{
4116 .name = "read-only",
4117 .type = QEMU_OPT_BOOL,
4118 .help = "open drive file as read-only",
4119 },{
4120 .name = "throttling.iops-total",
4121 .type = QEMU_OPT_NUMBER,
4122 .help = "limit total I/O operations per second",
4123 },{
4124 .name = "throttling.iops-read",
4125 .type = QEMU_OPT_NUMBER,
4126 .help = "limit read operations per second",
4127 },{
4128 .name = "throttling.iops-write",
4129 .type = QEMU_OPT_NUMBER,
4130 .help = "limit write operations per second",
4131 },{
4132 .name = "throttling.bps-total",
4133 .type = QEMU_OPT_NUMBER,
4134 .help = "limit total bytes per second",
4135 },{
4136 .name = "throttling.bps-read",
4137 .type = QEMU_OPT_NUMBER,
4138 .help = "limit read bytes per second",
4139 },{
4140 .name = "throttling.bps-write",
4141 .type = QEMU_OPT_NUMBER,
4142 .help = "limit write bytes per second",
4143 },{
4144 .name = "throttling.iops-total-max",
4145 .type = QEMU_OPT_NUMBER,
4146 .help = "I/O operations burst",
4147 },{
4148 .name = "throttling.iops-read-max",
4149 .type = QEMU_OPT_NUMBER,
4150 .help = "I/O operations read burst",
4151 },{
4152 .name = "throttling.iops-write-max",
4153 .type = QEMU_OPT_NUMBER,
4154 .help = "I/O operations write burst",
4155 },{
4156 .name = "throttling.bps-total-max",
4157 .type = QEMU_OPT_NUMBER,
4158 .help = "total bytes burst",
4159 },{
4160 .name = "throttling.bps-read-max",
4161 .type = QEMU_OPT_NUMBER,
4162 .help = "total bytes read burst",
4163 },{
4164 .name = "throttling.bps-write-max",
4165 .type = QEMU_OPT_NUMBER,
4166 .help = "total bytes write burst",
4167 },{
4168 .name = "throttling.iops-total-max-length",
4169 .type = QEMU_OPT_NUMBER,
4170 .help = "length of the iops-total-max burst period, in seconds",
4171 },{
4172 .name = "throttling.iops-read-max-length",
4173 .type = QEMU_OPT_NUMBER,
4174 .help = "length of the iops-read-max burst period, in seconds",
4175 },{
4176 .name = "throttling.iops-write-max-length",
4177 .type = QEMU_OPT_NUMBER,
4178 .help = "length of the iops-write-max burst period, in seconds",
4179 },{
4180 .name = "throttling.bps-total-max-length",
4181 .type = QEMU_OPT_NUMBER,
4182 .help = "length of the bps-total-max burst period, in seconds",
4183 },{
4184 .name = "throttling.bps-read-max-length",
4185 .type = QEMU_OPT_NUMBER,
4186 .help = "length of the bps-read-max burst period, in seconds",
4187 },{
4188 .name = "throttling.bps-write-max-length",
4189 .type = QEMU_OPT_NUMBER,
4190 .help = "length of the bps-write-max burst period, in seconds",
4191 },{
4192 .name = "throttling.iops-size",
4193 .type = QEMU_OPT_NUMBER,
4194 .help = "when limiting by iops max size of an I/O in bytes",
4195 },{
4196 .name = "throttling.group",
4197 .type = QEMU_OPT_STRING,
4198 .help = "name of the block throttling group",
4199 },{
4200 .name = "copy-on-read",
4201 .type = QEMU_OPT_BOOL,
4202 .help = "copy read data from backing file into image file",
4203 },{
4204 .name = "detect-zeroes",
4205 .type = QEMU_OPT_STRING,
4206 .help = "try to optimize zero writes (off, on, unmap)",
4207 },{
4208 .name = "stats-account-invalid",
4209 .type = QEMU_OPT_BOOL,
4210 .help = "whether to account for invalid I/O operations "
4211 "in the statistics",
4212 },{
4213 .name = "stats-account-failed",
4214 .type = QEMU_OPT_BOOL,
4215 .help = "whether to account for failed I/O operations "
4216 "in the statistics",
4217 },
4218 { /* end of list */ }
4219 },
4220 };
4221
4222 static QemuOptsList qemu_root_bds_opts = {
4223 .name = "root-bds",
4224 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4225 .desc = {
4226 {
4227 .name = "discard",
4228 .type = QEMU_OPT_STRING,
4229 .help = "discard operation (ignore/off, unmap/on)",
4230 },{
4231 .name = "aio",
4232 .type = QEMU_OPT_STRING,
4233 .help = "host AIO implementation (threads, native)",
4234 },{
4235 .name = "read-only",
4236 .type = QEMU_OPT_BOOL,
4237 .help = "open drive file as read-only",
4238 },{
4239 .name = "copy-on-read",
4240 .type = QEMU_OPT_BOOL,
4241 .help = "copy read data from backing file into image file",
4242 },{
4243 .name = "detect-zeroes",
4244 .type = QEMU_OPT_STRING,
4245 .help = "try to optimize zero writes (off, on, unmap)",
4246 },
4247 { /* end of list */ }
4248 },
4249 };
4250
4251 QemuOptsList qemu_drive_opts = {
4252 .name = "drive",
4253 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4254 .desc = {
4255 /*
4256 * no elements => accept any params
4257 * validation will happen later
4258 */
4259 { /* end of list */ }
4260 },
4261 };
AR7 emulation for QEMU