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[mirror_qemu.git] / blockdev.c
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "sysemu/block-backend.h"
34 #include "sysemu/blockdev.h"
35 #include "hw/block/block.h"
36 #include "block/blockjob.h"
37 #include "block/throttle-groups.h"
38 #include "monitor/monitor.h"
39 #include "qemu/error-report.h"
40 #include "qemu/option.h"
41 #include "qemu/config-file.h"
42 #include "qapi/qmp/types.h"
43 #include "qapi-visit.h"
44 #include "qapi/qmp/qerror.h"
45 #include "qapi/qmp-output-visitor.h"
46 #include "qapi/util.h"
47 #include "sysemu/sysemu.h"
48 #include "block/block_int.h"
49 #include "qmp-commands.h"
50 #include "trace.h"
51 #include "sysemu/arch_init.h"
52
53 static const char *const if_name[IF_COUNT] = {
54 [IF_NONE] = "none",
55 [IF_IDE] = "ide",
56 [IF_SCSI] = "scsi",
57 [IF_FLOPPY] = "floppy",
58 [IF_PFLASH] = "pflash",
59 [IF_MTD] = "mtd",
60 [IF_SD] = "sd",
61 [IF_VIRTIO] = "virtio",
62 [IF_XEN] = "xen",
63 };
64
65 static int if_max_devs[IF_COUNT] = {
66 /*
67 * Do not change these numbers! They govern how drive option
68 * index maps to unit and bus. That mapping is ABI.
69 *
70 * All controllers used to imlement if=T drives need to support
71 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
72 * Otherwise, some index values map to "impossible" bus, unit
73 * values.
74 *
75 * For instance, if you change [IF_SCSI] to 255, -drive
76 * if=scsi,index=12 no longer means bus=1,unit=5, but
77 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
78 * the drive can't be set up. Regression.
79 */
80 [IF_IDE] = 2,
81 [IF_SCSI] = 7,
82 };
83
84 /**
85 * Boards may call this to offer board-by-board overrides
86 * of the default, global values.
87 */
88 void override_max_devs(BlockInterfaceType type, int max_devs)
89 {
90 BlockBackend *blk;
91 DriveInfo *dinfo;
92
93 if (max_devs <= 0) {
94 return;
95 }
96
97 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
98 dinfo = blk_legacy_dinfo(blk);
99 if (dinfo->type == type) {
100 fprintf(stderr, "Cannot override units-per-bus property of"
101 " the %s interface, because a drive of that type has"
102 " already been added.\n", if_name[type]);
103 g_assert_not_reached();
104 }
105 }
106
107 if_max_devs[type] = max_devs;
108 }
109
110 /*
111 * We automatically delete the drive when a device using it gets
112 * unplugged. Questionable feature, but we can't just drop it.
113 * Device models call blockdev_mark_auto_del() to schedule the
114 * automatic deletion, and generic qdev code calls blockdev_auto_del()
115 * when deletion is actually safe.
116 */
117 void blockdev_mark_auto_del(BlockBackend *blk)
118 {
119 DriveInfo *dinfo = blk_legacy_dinfo(blk);
120 BlockDriverState *bs = blk_bs(blk);
121 AioContext *aio_context;
122
123 if (!dinfo) {
124 return;
125 }
126
127 if (bs) {
128 aio_context = bdrv_get_aio_context(bs);
129 aio_context_acquire(aio_context);
130
131 if (bs->job) {
132 block_job_cancel(bs->job);
133 }
134
135 aio_context_release(aio_context);
136 }
137
138 dinfo->auto_del = 1;
139 }
140
141 void blockdev_auto_del(BlockBackend *blk)
142 {
143 DriveInfo *dinfo = blk_legacy_dinfo(blk);
144
145 if (dinfo && dinfo->auto_del) {
146 blk_unref(blk);
147 }
148 }
149
150 /**
151 * Returns the current mapping of how many units per bus
152 * a particular interface can support.
153 *
154 * A positive integer indicates n units per bus.
155 * 0 implies the mapping has not been established.
156 * -1 indicates an invalid BlockInterfaceType was given.
157 */
158 int drive_get_max_devs(BlockInterfaceType type)
159 {
160 if (type >= IF_IDE && type < IF_COUNT) {
161 return if_max_devs[type];
162 }
163
164 return -1;
165 }
166
167 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
168 {
169 int max_devs = if_max_devs[type];
170 return max_devs ? index / max_devs : 0;
171 }
172
173 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
174 {
175 int max_devs = if_max_devs[type];
176 return max_devs ? index % max_devs : index;
177 }
178
179 QemuOpts *drive_def(const char *optstr)
180 {
181 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
182 }
183
184 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
185 const char *optstr)
186 {
187 QemuOpts *opts;
188
189 opts = drive_def(optstr);
190 if (!opts) {
191 return NULL;
192 }
193 if (type != IF_DEFAULT) {
194 qemu_opt_set(opts, "if", if_name[type], &error_abort);
195 }
196 if (index >= 0) {
197 qemu_opt_set_number(opts, "index", index, &error_abort);
198 }
199 if (file)
200 qemu_opt_set(opts, "file", file, &error_abort);
201 return opts;
202 }
203
204 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
205 {
206 BlockBackend *blk;
207 DriveInfo *dinfo;
208
209 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
210 dinfo = blk_legacy_dinfo(blk);
211 if (dinfo && dinfo->type == type
212 && dinfo->bus == bus && dinfo->unit == unit) {
213 return dinfo;
214 }
215 }
216
217 return NULL;
218 }
219
220 bool drive_check_orphaned(void)
221 {
222 BlockBackend *blk;
223 DriveInfo *dinfo;
224 bool rs = false;
225
226 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
227 dinfo = blk_legacy_dinfo(blk);
228 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
229 /* Unless this is a default drive, this may be an oversight. */
230 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
231 dinfo->type != IF_NONE) {
232 fprintf(stderr, "Warning: Orphaned drive without device: "
233 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
234 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
235 if_name[dinfo->type], dinfo->bus, dinfo->unit);
236 rs = true;
237 }
238 }
239
240 return rs;
241 }
242
243 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
244 {
245 return drive_get(type,
246 drive_index_to_bus_id(type, index),
247 drive_index_to_unit_id(type, index));
248 }
249
250 int drive_get_max_bus(BlockInterfaceType type)
251 {
252 int max_bus;
253 BlockBackend *blk;
254 DriveInfo *dinfo;
255
256 max_bus = -1;
257 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
258 dinfo = blk_legacy_dinfo(blk);
259 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
260 max_bus = dinfo->bus;
261 }
262 }
263 return max_bus;
264 }
265
266 /* Get a block device. This should only be used for single-drive devices
267 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
268 appropriate bus. */
269 DriveInfo *drive_get_next(BlockInterfaceType type)
270 {
271 static int next_block_unit[IF_COUNT];
272
273 return drive_get(type, 0, next_block_unit[type]++);
274 }
275
276 static void bdrv_format_print(void *opaque, const char *name)
277 {
278 error_printf(" %s", name);
279 }
280
281 typedef struct {
282 QEMUBH *bh;
283 BlockDriverState *bs;
284 } BDRVPutRefBH;
285
286 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
287 {
288 if (!strcmp(buf, "ignore")) {
289 return BLOCKDEV_ON_ERROR_IGNORE;
290 } else if (!is_read && !strcmp(buf, "enospc")) {
291 return BLOCKDEV_ON_ERROR_ENOSPC;
292 } else if (!strcmp(buf, "stop")) {
293 return BLOCKDEV_ON_ERROR_STOP;
294 } else if (!strcmp(buf, "report")) {
295 return BLOCKDEV_ON_ERROR_REPORT;
296 } else {
297 error_setg(errp, "'%s' invalid %s error action",
298 buf, is_read ? "read" : "write");
299 return -1;
300 }
301 }
302
303 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
304 Error **errp)
305 {
306 const QListEntry *entry;
307 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
308 switch (qobject_type(entry->value)) {
309
310 case QTYPE_QSTRING: {
311 unsigned long long length;
312 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
313 if (parse_uint_full(str, &length, 10) == 0 &&
314 length > 0 && length <= UINT_MAX) {
315 block_acct_add_interval(stats, (unsigned) length);
316 } else {
317 error_setg(errp, "Invalid interval length: %s", str);
318 return false;
319 }
320 break;
321 }
322
323 case QTYPE_QINT: {
324 int64_t length = qint_get_int(qobject_to_qint(entry->value));
325 if (length > 0 && length <= UINT_MAX) {
326 block_acct_add_interval(stats, (unsigned) length);
327 } else {
328 error_setg(errp, "Invalid interval length: %" PRId64, length);
329 return false;
330 }
331 break;
332 }
333
334 default:
335 error_setg(errp, "The specification of stats-intervals is invalid");
336 return false;
337 }
338 }
339 return true;
340 }
341
342 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
343 {
344 if (throttle_conflicting(cfg)) {
345 error_setg(errp, "bps/iops/max total values and read/write values"
346 " cannot be used at the same time");
347 return false;
348 }
349
350 if (!throttle_is_valid(cfg)) {
351 error_setg(errp, "bps/iops/max values must be within [0, %lld]",
352 THROTTLE_VALUE_MAX);
353 return false;
354 }
355
356 if (throttle_max_is_missing_limit(cfg)) {
357 error_setg(errp, "bps_max/iops_max require corresponding"
358 " bps/iops values");
359 return false;
360 }
361
362 return true;
363 }
364
365 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
366
367 /* All parameters but @opts are optional and may be set to NULL. */
368 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
369 const char **throttling_group, ThrottleConfig *throttle_cfg,
370 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
371 {
372 const char *discard;
373 Error *local_error = NULL;
374 const char *aio;
375
376 if (bdrv_flags) {
377 if (!qemu_opt_get_bool(opts, "read-only", false)) {
378 *bdrv_flags |= BDRV_O_RDWR;
379 }
380 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
381 *bdrv_flags |= BDRV_O_COPY_ON_READ;
382 }
383
384 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
385 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
386 error_setg(errp, "Invalid discard option");
387 return;
388 }
389 }
390
391 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
392 if (!strcmp(aio, "native")) {
393 *bdrv_flags |= BDRV_O_NATIVE_AIO;
394 } else if (!strcmp(aio, "threads")) {
395 /* this is the default */
396 } else {
397 error_setg(errp, "invalid aio option");
398 return;
399 }
400 }
401 }
402
403 /* disk I/O throttling */
404 if (throttling_group) {
405 *throttling_group = qemu_opt_get(opts, "throttling.group");
406 }
407
408 if (throttle_cfg) {
409 memset(throttle_cfg, 0, sizeof(*throttle_cfg));
410 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
411 qemu_opt_get_number(opts, "throttling.bps-total", 0);
412 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
413 qemu_opt_get_number(opts, "throttling.bps-read", 0);
414 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
415 qemu_opt_get_number(opts, "throttling.bps-write", 0);
416 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
417 qemu_opt_get_number(opts, "throttling.iops-total", 0);
418 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
419 qemu_opt_get_number(opts, "throttling.iops-read", 0);
420 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
421 qemu_opt_get_number(opts, "throttling.iops-write", 0);
422
423 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
424 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
425 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
426 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
427 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
428 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
429 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
430 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
431 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
432 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
433 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
434 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
435
436 throttle_cfg->op_size =
437 qemu_opt_get_number(opts, "throttling.iops-size", 0);
438
439 if (!check_throttle_config(throttle_cfg, errp)) {
440 return;
441 }
442 }
443
444 if (detect_zeroes) {
445 *detect_zeroes =
446 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
447 qemu_opt_get(opts, "detect-zeroes"),
448 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
449 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
450 &local_error);
451 if (local_error) {
452 error_propagate(errp, local_error);
453 return;
454 }
455
456 if (bdrv_flags &&
457 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
458 !(*bdrv_flags & BDRV_O_UNMAP))
459 {
460 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
461 "without setting discard operation to unmap");
462 return;
463 }
464 }
465 }
466
467 /* Takes the ownership of bs_opts */
468 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
469 Error **errp)
470 {
471 const char *buf;
472 int bdrv_flags = 0;
473 int on_read_error, on_write_error;
474 bool account_invalid, account_failed;
475 BlockBackend *blk;
476 BlockDriverState *bs;
477 ThrottleConfig cfg;
478 int snapshot = 0;
479 Error *error = NULL;
480 QemuOpts *opts;
481 QDict *interval_dict = NULL;
482 QList *interval_list = NULL;
483 const char *id;
484 BlockdevDetectZeroesOptions detect_zeroes =
485 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
486 const char *throttling_group = NULL;
487
488 /* Check common options by copying from bs_opts to opts, all other options
489 * stay in bs_opts for processing by bdrv_open(). */
490 id = qdict_get_try_str(bs_opts, "id");
491 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
492 if (error) {
493 error_propagate(errp, error);
494 goto err_no_opts;
495 }
496
497 qemu_opts_absorb_qdict(opts, bs_opts, &error);
498 if (error) {
499 error_propagate(errp, error);
500 goto early_err;
501 }
502
503 if (id) {
504 qdict_del(bs_opts, "id");
505 }
506
507 /* extract parameters */
508 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
509
510 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
511 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
512
513 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
514 qdict_array_split(interval_dict, &interval_list);
515
516 if (qdict_size(interval_dict) != 0) {
517 error_setg(errp, "Invalid option stats-intervals.%s",
518 qdict_first(interval_dict)->key);
519 goto early_err;
520 }
521
522 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
523 &detect_zeroes, &error);
524 if (error) {
525 error_propagate(errp, error);
526 goto early_err;
527 }
528
529 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
530 if (is_help_option(buf)) {
531 error_printf("Supported formats:");
532 bdrv_iterate_format(bdrv_format_print, NULL);
533 error_printf("\n");
534 goto early_err;
535 }
536
537 if (qdict_haskey(bs_opts, "driver")) {
538 error_setg(errp, "Cannot specify both 'driver' and 'format'");
539 goto early_err;
540 }
541 qdict_put(bs_opts, "driver", qstring_from_str(buf));
542 }
543
544 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
545 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
546 on_write_error = parse_block_error_action(buf, 0, &error);
547 if (error) {
548 error_propagate(errp, error);
549 goto early_err;
550 }
551 }
552
553 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
554 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
555 on_read_error = parse_block_error_action(buf, 1, &error);
556 if (error) {
557 error_propagate(errp, error);
558 goto early_err;
559 }
560 }
561
562 if (snapshot) {
563 bdrv_flags |= BDRV_O_SNAPSHOT;
564 }
565
566 /* init */
567 if ((!file || !*file) && !qdict_size(bs_opts)) {
568 BlockBackendRootState *blk_rs;
569
570 blk = blk_new(qemu_opts_id(opts), errp);
571 if (!blk) {
572 goto early_err;
573 }
574
575 blk_rs = blk_get_root_state(blk);
576 blk_rs->open_flags = bdrv_flags;
577 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
578 blk_rs->detect_zeroes = detect_zeroes;
579
580 if (throttle_enabled(&cfg)) {
581 if (!throttling_group) {
582 throttling_group = blk_name(blk);
583 }
584 blk_rs->throttle_group = g_strdup(throttling_group);
585 blk_rs->throttle_state = throttle_group_incref(throttling_group);
586 blk_rs->throttle_state->cfg = cfg;
587 }
588
589 QDECREF(bs_opts);
590 } else {
591 if (file && !*file) {
592 file = NULL;
593 }
594
595 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
596 * with other callers) rather than what we want as the real defaults.
597 * Apply the defaults here instead. */
598 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
599 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
600 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
601
602 if (snapshot) {
603 /* always use cache=unsafe with snapshot */
604 qdict_put(bs_opts, BDRV_OPT_CACHE_WB, qstring_from_str("on"));
605 qdict_put(bs_opts, BDRV_OPT_CACHE_DIRECT, qstring_from_str("off"));
606 qdict_put(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, qstring_from_str("on"));
607 }
608
609 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
610 errp);
611 if (!blk) {
612 goto err_no_bs_opts;
613 }
614 bs = blk_bs(blk);
615
616 bs->detect_zeroes = detect_zeroes;
617
618 /* disk I/O throttling */
619 if (throttle_enabled(&cfg)) {
620 if (!throttling_group) {
621 throttling_group = blk_name(blk);
622 }
623 bdrv_io_limits_enable(bs, throttling_group);
624 bdrv_set_io_limits(bs, &cfg);
625 }
626
627 if (bdrv_key_required(bs)) {
628 autostart = 0;
629 }
630
631 block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
632
633 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
634 blk_unref(blk);
635 blk = NULL;
636 goto err_no_bs_opts;
637 }
638 }
639
640 blk_set_on_error(blk, on_read_error, on_write_error);
641
642 err_no_bs_opts:
643 qemu_opts_del(opts);
644 QDECREF(interval_dict);
645 QDECREF(interval_list);
646 return blk;
647
648 early_err:
649 qemu_opts_del(opts);
650 QDECREF(interval_dict);
651 QDECREF(interval_list);
652 err_no_opts:
653 QDECREF(bs_opts);
654 return NULL;
655 }
656
657 static QemuOptsList qemu_root_bds_opts;
658
659 /* Takes the ownership of bs_opts */
660 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
661 {
662 BlockDriverState *bs;
663 QemuOpts *opts;
664 Error *local_error = NULL;
665 BlockdevDetectZeroesOptions detect_zeroes;
666 int ret;
667 int bdrv_flags = 0;
668
669 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
670 if (!opts) {
671 goto fail;
672 }
673
674 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
675 if (local_error) {
676 error_propagate(errp, local_error);
677 goto fail;
678 }
679
680 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
681 &detect_zeroes, &local_error);
682 if (local_error) {
683 error_propagate(errp, local_error);
684 goto fail;
685 }
686
687 bs = NULL;
688 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
689 if (ret < 0) {
690 goto fail_no_bs_opts;
691 }
692
693 bs->detect_zeroes = detect_zeroes;
694
695 fail_no_bs_opts:
696 qemu_opts_del(opts);
697 return bs;
698
699 fail:
700 qemu_opts_del(opts);
701 QDECREF(bs_opts);
702 return NULL;
703 }
704
705 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
706 Error **errp)
707 {
708 const char *value;
709
710 value = qemu_opt_get(opts, from);
711 if (value) {
712 if (qemu_opt_find(opts, to)) {
713 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
714 "same time", to, from);
715 return;
716 }
717 }
718
719 /* rename all items in opts */
720 while ((value = qemu_opt_get(opts, from))) {
721 qemu_opt_set(opts, to, value, &error_abort);
722 qemu_opt_unset(opts, from);
723 }
724 }
725
726 QemuOptsList qemu_legacy_drive_opts = {
727 .name = "drive",
728 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
729 .desc = {
730 {
731 .name = "bus",
732 .type = QEMU_OPT_NUMBER,
733 .help = "bus number",
734 },{
735 .name = "unit",
736 .type = QEMU_OPT_NUMBER,
737 .help = "unit number (i.e. lun for scsi)",
738 },{
739 .name = "index",
740 .type = QEMU_OPT_NUMBER,
741 .help = "index number",
742 },{
743 .name = "media",
744 .type = QEMU_OPT_STRING,
745 .help = "media type (disk, cdrom)",
746 },{
747 .name = "if",
748 .type = QEMU_OPT_STRING,
749 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
750 },{
751 .name = "cyls",
752 .type = QEMU_OPT_NUMBER,
753 .help = "number of cylinders (ide disk geometry)",
754 },{
755 .name = "heads",
756 .type = QEMU_OPT_NUMBER,
757 .help = "number of heads (ide disk geometry)",
758 },{
759 .name = "secs",
760 .type = QEMU_OPT_NUMBER,
761 .help = "number of sectors (ide disk geometry)",
762 },{
763 .name = "trans",
764 .type = QEMU_OPT_STRING,
765 .help = "chs translation (auto, lba, none)",
766 },{
767 .name = "boot",
768 .type = QEMU_OPT_BOOL,
769 .help = "(deprecated, ignored)",
770 },{
771 .name = "addr",
772 .type = QEMU_OPT_STRING,
773 .help = "pci address (virtio only)",
774 },{
775 .name = "serial",
776 .type = QEMU_OPT_STRING,
777 .help = "disk serial number",
778 },{
779 .name = "file",
780 .type = QEMU_OPT_STRING,
781 .help = "file name",
782 },
783
784 /* Options that are passed on, but have special semantics with -drive */
785 {
786 .name = "read-only",
787 .type = QEMU_OPT_BOOL,
788 .help = "open drive file as read-only",
789 },{
790 .name = "rerror",
791 .type = QEMU_OPT_STRING,
792 .help = "read error action",
793 },{
794 .name = "werror",
795 .type = QEMU_OPT_STRING,
796 .help = "write error action",
797 },{
798 .name = "copy-on-read",
799 .type = QEMU_OPT_BOOL,
800 .help = "copy read data from backing file into image file",
801 },
802
803 { /* end of list */ }
804 },
805 };
806
807 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
808 {
809 const char *value;
810 BlockBackend *blk;
811 DriveInfo *dinfo = NULL;
812 QDict *bs_opts;
813 QemuOpts *legacy_opts;
814 DriveMediaType media = MEDIA_DISK;
815 BlockInterfaceType type;
816 int cyls, heads, secs, translation;
817 int max_devs, bus_id, unit_id, index;
818 const char *devaddr;
819 const char *werror, *rerror;
820 bool read_only = false;
821 bool copy_on_read;
822 const char *serial;
823 const char *filename;
824 Error *local_err = NULL;
825 int i;
826
827 /* Change legacy command line options into QMP ones */
828 static const struct {
829 const char *from;
830 const char *to;
831 } opt_renames[] = {
832 { "iops", "throttling.iops-total" },
833 { "iops_rd", "throttling.iops-read" },
834 { "iops_wr", "throttling.iops-write" },
835
836 { "bps", "throttling.bps-total" },
837 { "bps_rd", "throttling.bps-read" },
838 { "bps_wr", "throttling.bps-write" },
839
840 { "iops_max", "throttling.iops-total-max" },
841 { "iops_rd_max", "throttling.iops-read-max" },
842 { "iops_wr_max", "throttling.iops-write-max" },
843
844 { "bps_max", "throttling.bps-total-max" },
845 { "bps_rd_max", "throttling.bps-read-max" },
846 { "bps_wr_max", "throttling.bps-write-max" },
847
848 { "iops_size", "throttling.iops-size" },
849
850 { "group", "throttling.group" },
851
852 { "readonly", "read-only" },
853 };
854
855 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
856 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
857 &local_err);
858 if (local_err) {
859 error_report_err(local_err);
860 return NULL;
861 }
862 }
863
864 value = qemu_opt_get(all_opts, "cache");
865 if (value) {
866 int flags = 0;
867
868 if (bdrv_parse_cache_flags(value, &flags) != 0) {
869 error_report("invalid cache option");
870 return NULL;
871 }
872
873 /* Specific options take precedence */
874 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
875 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
876 !!(flags & BDRV_O_CACHE_WB), &error_abort);
877 }
878 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
879 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
880 !!(flags & BDRV_O_NOCACHE), &error_abort);
881 }
882 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
883 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
884 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
885 }
886 qemu_opt_unset(all_opts, "cache");
887 }
888
889 /* Get a QDict for processing the options */
890 bs_opts = qdict_new();
891 qemu_opts_to_qdict(all_opts, bs_opts);
892
893 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
894 &error_abort);
895 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
896 if (local_err) {
897 error_report_err(local_err);
898 goto fail;
899 }
900
901 /* Deprecated option boot=[on|off] */
902 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
903 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
904 "ignored. Future versions will reject this parameter. Please "
905 "update your scripts.\n");
906 }
907
908 /* Media type */
909 value = qemu_opt_get(legacy_opts, "media");
910 if (value) {
911 if (!strcmp(value, "disk")) {
912 media = MEDIA_DISK;
913 } else if (!strcmp(value, "cdrom")) {
914 media = MEDIA_CDROM;
915 read_only = true;
916 } else {
917 error_report("'%s' invalid media", value);
918 goto fail;
919 }
920 }
921
922 /* copy-on-read is disabled with a warning for read-only devices */
923 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
924 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
925
926 if (read_only && copy_on_read) {
927 error_report("warning: disabling copy-on-read on read-only drive");
928 copy_on_read = false;
929 }
930
931 qdict_put(bs_opts, "read-only",
932 qstring_from_str(read_only ? "on" : "off"));
933 qdict_put(bs_opts, "copy-on-read",
934 qstring_from_str(copy_on_read ? "on" :"off"));
935
936 /* Controller type */
937 value = qemu_opt_get(legacy_opts, "if");
938 if (value) {
939 for (type = 0;
940 type < IF_COUNT && strcmp(value, if_name[type]);
941 type++) {
942 }
943 if (type == IF_COUNT) {
944 error_report("unsupported bus type '%s'", value);
945 goto fail;
946 }
947 } else {
948 type = block_default_type;
949 }
950
951 /* Geometry */
952 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
953 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
954 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
955
956 if (cyls || heads || secs) {
957 if (cyls < 1) {
958 error_report("invalid physical cyls number");
959 goto fail;
960 }
961 if (heads < 1) {
962 error_report("invalid physical heads number");
963 goto fail;
964 }
965 if (secs < 1) {
966 error_report("invalid physical secs number");
967 goto fail;
968 }
969 }
970
971 translation = BIOS_ATA_TRANSLATION_AUTO;
972 value = qemu_opt_get(legacy_opts, "trans");
973 if (value != NULL) {
974 if (!cyls) {
975 error_report("'%s' trans must be used with cyls, heads and secs",
976 value);
977 goto fail;
978 }
979 if (!strcmp(value, "none")) {
980 translation = BIOS_ATA_TRANSLATION_NONE;
981 } else if (!strcmp(value, "lba")) {
982 translation = BIOS_ATA_TRANSLATION_LBA;
983 } else if (!strcmp(value, "large")) {
984 translation = BIOS_ATA_TRANSLATION_LARGE;
985 } else if (!strcmp(value, "rechs")) {
986 translation = BIOS_ATA_TRANSLATION_RECHS;
987 } else if (!strcmp(value, "auto")) {
988 translation = BIOS_ATA_TRANSLATION_AUTO;
989 } else {
990 error_report("'%s' invalid translation type", value);
991 goto fail;
992 }
993 }
994
995 if (media == MEDIA_CDROM) {
996 if (cyls || secs || heads) {
997 error_report("CHS can't be set with media=cdrom");
998 goto fail;
999 }
1000 }
1001
1002 /* Device address specified by bus/unit or index.
1003 * If none was specified, try to find the first free one. */
1004 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
1005 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
1006 index = qemu_opt_get_number(legacy_opts, "index", -1);
1007
1008 max_devs = if_max_devs[type];
1009
1010 if (index != -1) {
1011 if (bus_id != 0 || unit_id != -1) {
1012 error_report("index cannot be used with bus and unit");
1013 goto fail;
1014 }
1015 bus_id = drive_index_to_bus_id(type, index);
1016 unit_id = drive_index_to_unit_id(type, index);
1017 }
1018
1019 if (unit_id == -1) {
1020 unit_id = 0;
1021 while (drive_get(type, bus_id, unit_id) != NULL) {
1022 unit_id++;
1023 if (max_devs && unit_id >= max_devs) {
1024 unit_id -= max_devs;
1025 bus_id++;
1026 }
1027 }
1028 }
1029
1030 if (max_devs && unit_id >= max_devs) {
1031 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1032 goto fail;
1033 }
1034
1035 if (drive_get(type, bus_id, unit_id) != NULL) {
1036 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1037 bus_id, unit_id, index);
1038 goto fail;
1039 }
1040
1041 /* Serial number */
1042 serial = qemu_opt_get(legacy_opts, "serial");
1043
1044 /* no id supplied -> create one */
1045 if (qemu_opts_id(all_opts) == NULL) {
1046 char *new_id;
1047 const char *mediastr = "";
1048 if (type == IF_IDE || type == IF_SCSI) {
1049 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1050 }
1051 if (max_devs) {
1052 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1053 mediastr, unit_id);
1054 } else {
1055 new_id = g_strdup_printf("%s%s%i", if_name[type],
1056 mediastr, unit_id);
1057 }
1058 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1059 g_free(new_id);
1060 }
1061
1062 /* Add virtio block device */
1063 devaddr = qemu_opt_get(legacy_opts, "addr");
1064 if (devaddr && type != IF_VIRTIO) {
1065 error_report("addr is not supported by this bus type");
1066 goto fail;
1067 }
1068
1069 if (type == IF_VIRTIO) {
1070 QemuOpts *devopts;
1071 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1072 &error_abort);
1073 if (arch_type == QEMU_ARCH_S390X) {
1074 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1075 } else {
1076 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1077 }
1078 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1079 &error_abort);
1080 if (devaddr) {
1081 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1082 }
1083 }
1084
1085 filename = qemu_opt_get(legacy_opts, "file");
1086
1087 /* Check werror/rerror compatibility with if=... */
1088 werror = qemu_opt_get(legacy_opts, "werror");
1089 if (werror != NULL) {
1090 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1091 type != IF_NONE) {
1092 error_report("werror is not supported by this bus type");
1093 goto fail;
1094 }
1095 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1096 }
1097
1098 rerror = qemu_opt_get(legacy_opts, "rerror");
1099 if (rerror != NULL) {
1100 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1101 type != IF_NONE) {
1102 error_report("rerror is not supported by this bus type");
1103 goto fail;
1104 }
1105 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1106 }
1107
1108 /* Actual block device init: Functionality shared with blockdev-add */
1109 blk = blockdev_init(filename, bs_opts, &local_err);
1110 bs_opts = NULL;
1111 if (!blk) {
1112 if (local_err) {
1113 error_report_err(local_err);
1114 }
1115 goto fail;
1116 } else {
1117 assert(!local_err);
1118 }
1119
1120 /* Create legacy DriveInfo */
1121 dinfo = g_malloc0(sizeof(*dinfo));
1122 dinfo->opts = all_opts;
1123
1124 dinfo->cyls = cyls;
1125 dinfo->heads = heads;
1126 dinfo->secs = secs;
1127 dinfo->trans = translation;
1128
1129 dinfo->type = type;
1130 dinfo->bus = bus_id;
1131 dinfo->unit = unit_id;
1132 dinfo->devaddr = devaddr;
1133 dinfo->serial = g_strdup(serial);
1134
1135 blk_set_legacy_dinfo(blk, dinfo);
1136
1137 switch(type) {
1138 case IF_IDE:
1139 case IF_SCSI:
1140 case IF_XEN:
1141 case IF_NONE:
1142 dinfo->media_cd = media == MEDIA_CDROM;
1143 break;
1144 default:
1145 break;
1146 }
1147
1148 fail:
1149 qemu_opts_del(legacy_opts);
1150 QDECREF(bs_opts);
1151 return dinfo;
1152 }
1153
1154 void hmp_commit(Monitor *mon, const QDict *qdict)
1155 {
1156 const char *device = qdict_get_str(qdict, "device");
1157 BlockBackend *blk;
1158 int ret;
1159
1160 if (!strcmp(device, "all")) {
1161 ret = bdrv_commit_all();
1162 } else {
1163 BlockDriverState *bs;
1164 AioContext *aio_context;
1165
1166 blk = blk_by_name(device);
1167 if (!blk) {
1168 monitor_printf(mon, "Device '%s' not found\n", device);
1169 return;
1170 }
1171 if (!blk_is_available(blk)) {
1172 monitor_printf(mon, "Device '%s' has no medium\n", device);
1173 return;
1174 }
1175
1176 bs = blk_bs(blk);
1177 aio_context = bdrv_get_aio_context(bs);
1178 aio_context_acquire(aio_context);
1179
1180 ret = bdrv_commit(bs);
1181
1182 aio_context_release(aio_context);
1183 }
1184 if (ret < 0) {
1185 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1186 strerror(-ret));
1187 }
1188 }
1189
1190 static void blockdev_do_action(TransactionActionKind type, void *data,
1191 Error **errp)
1192 {
1193 TransactionAction action;
1194 TransactionActionList list;
1195
1196 action.type = type;
1197 action.u.data = data;
1198 list.value = &action;
1199 list.next = NULL;
1200 qmp_transaction(&list, false, NULL, errp);
1201 }
1202
1203 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1204 bool has_node_name, const char *node_name,
1205 const char *snapshot_file,
1206 bool has_snapshot_node_name,
1207 const char *snapshot_node_name,
1208 bool has_format, const char *format,
1209 bool has_mode, NewImageMode mode, Error **errp)
1210 {
1211 BlockdevSnapshotSync snapshot = {
1212 .has_device = has_device,
1213 .device = (char *) device,
1214 .has_node_name = has_node_name,
1215 .node_name = (char *) node_name,
1216 .snapshot_file = (char *) snapshot_file,
1217 .has_snapshot_node_name = has_snapshot_node_name,
1218 .snapshot_node_name = (char *) snapshot_node_name,
1219 .has_format = has_format,
1220 .format = (char *) format,
1221 .has_mode = has_mode,
1222 .mode = mode,
1223 };
1224 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1225 &snapshot, errp);
1226 }
1227
1228 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1229 Error **errp)
1230 {
1231 BlockdevSnapshot snapshot_data = {
1232 .node = (char *) node,
1233 .overlay = (char *) overlay
1234 };
1235
1236 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1237 &snapshot_data, errp);
1238 }
1239
1240 void qmp_blockdev_snapshot_internal_sync(const char *device,
1241 const char *name,
1242 Error **errp)
1243 {
1244 BlockdevSnapshotInternal snapshot = {
1245 .device = (char *) device,
1246 .name = (char *) name
1247 };
1248
1249 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1250 &snapshot, errp);
1251 }
1252
1253 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1254 bool has_id,
1255 const char *id,
1256 bool has_name,
1257 const char *name,
1258 Error **errp)
1259 {
1260 BlockDriverState *bs;
1261 BlockBackend *blk;
1262 AioContext *aio_context;
1263 QEMUSnapshotInfo sn;
1264 Error *local_err = NULL;
1265 SnapshotInfo *info = NULL;
1266 int ret;
1267
1268 blk = blk_by_name(device);
1269 if (!blk) {
1270 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1271 "Device '%s' not found", device);
1272 return NULL;
1273 }
1274
1275 aio_context = blk_get_aio_context(blk);
1276 aio_context_acquire(aio_context);
1277
1278 if (!has_id) {
1279 id = NULL;
1280 }
1281
1282 if (!has_name) {
1283 name = NULL;
1284 }
1285
1286 if (!id && !name) {
1287 error_setg(errp, "Name or id must be provided");
1288 goto out_aio_context;
1289 }
1290
1291 if (!blk_is_available(blk)) {
1292 error_setg(errp, "Device '%s' has no medium", device);
1293 goto out_aio_context;
1294 }
1295 bs = blk_bs(blk);
1296
1297 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1298 goto out_aio_context;
1299 }
1300
1301 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1302 if (local_err) {
1303 error_propagate(errp, local_err);
1304 goto out_aio_context;
1305 }
1306 if (!ret) {
1307 error_setg(errp,
1308 "Snapshot with id '%s' and name '%s' does not exist on "
1309 "device '%s'",
1310 STR_OR_NULL(id), STR_OR_NULL(name), device);
1311 goto out_aio_context;
1312 }
1313
1314 bdrv_snapshot_delete(bs, id, name, &local_err);
1315 if (local_err) {
1316 error_propagate(errp, local_err);
1317 goto out_aio_context;
1318 }
1319
1320 aio_context_release(aio_context);
1321
1322 info = g_new0(SnapshotInfo, 1);
1323 info->id = g_strdup(sn.id_str);
1324 info->name = g_strdup(sn.name);
1325 info->date_nsec = sn.date_nsec;
1326 info->date_sec = sn.date_sec;
1327 info->vm_state_size = sn.vm_state_size;
1328 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1329 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1330
1331 return info;
1332
1333 out_aio_context:
1334 aio_context_release(aio_context);
1335 return NULL;
1336 }
1337
1338 /**
1339 * block_dirty_bitmap_lookup:
1340 * Return a dirty bitmap (if present), after validating
1341 * the node reference and bitmap names.
1342 *
1343 * @node: The name of the BDS node to search for bitmaps
1344 * @name: The name of the bitmap to search for
1345 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1346 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1347 * @errp: Output pointer for error information. Can be NULL.
1348 *
1349 * @return: A bitmap object on success, or NULL on failure.
1350 */
1351 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1352 const char *name,
1353 BlockDriverState **pbs,
1354 AioContext **paio,
1355 Error **errp)
1356 {
1357 BlockDriverState *bs;
1358 BdrvDirtyBitmap *bitmap;
1359 AioContext *aio_context;
1360
1361 if (!node) {
1362 error_setg(errp, "Node cannot be NULL");
1363 return NULL;
1364 }
1365 if (!name) {
1366 error_setg(errp, "Bitmap name cannot be NULL");
1367 return NULL;
1368 }
1369 bs = bdrv_lookup_bs(node, node, NULL);
1370 if (!bs) {
1371 error_setg(errp, "Node '%s' not found", node);
1372 return NULL;
1373 }
1374
1375 aio_context = bdrv_get_aio_context(bs);
1376 aio_context_acquire(aio_context);
1377
1378 bitmap = bdrv_find_dirty_bitmap(bs, name);
1379 if (!bitmap) {
1380 error_setg(errp, "Dirty bitmap '%s' not found", name);
1381 goto fail;
1382 }
1383
1384 if (pbs) {
1385 *pbs = bs;
1386 }
1387 if (paio) {
1388 *paio = aio_context;
1389 } else {
1390 aio_context_release(aio_context);
1391 }
1392
1393 return bitmap;
1394
1395 fail:
1396 aio_context_release(aio_context);
1397 return NULL;
1398 }
1399
1400 /* New and old BlockDriverState structs for atomic group operations */
1401
1402 typedef struct BlkActionState BlkActionState;
1403
1404 /**
1405 * BlkActionOps:
1406 * Table of operations that define an Action.
1407 *
1408 * @instance_size: Size of state struct, in bytes.
1409 * @prepare: Prepare the work, must NOT be NULL.
1410 * @commit: Commit the changes, can be NULL.
1411 * @abort: Abort the changes on fail, can be NULL.
1412 * @clean: Clean up resources after all transaction actions have called
1413 * commit() or abort(). Can be NULL.
1414 *
1415 * Only prepare() may fail. In a single transaction, only one of commit() or
1416 * abort() will be called. clean() will always be called if it is present.
1417 */
1418 typedef struct BlkActionOps {
1419 size_t instance_size;
1420 void (*prepare)(BlkActionState *common, Error **errp);
1421 void (*commit)(BlkActionState *common);
1422 void (*abort)(BlkActionState *common);
1423 void (*clean)(BlkActionState *common);
1424 } BlkActionOps;
1425
1426 /**
1427 * BlkActionState:
1428 * Describes one Action's state within a Transaction.
1429 *
1430 * @action: QAPI-defined enum identifying which Action to perform.
1431 * @ops: Table of ActionOps this Action can perform.
1432 * @block_job_txn: Transaction which this action belongs to.
1433 * @entry: List membership for all Actions in this Transaction.
1434 *
1435 * This structure must be arranged as first member in a subclassed type,
1436 * assuming that the compiler will also arrange it to the same offsets as the
1437 * base class.
1438 */
1439 struct BlkActionState {
1440 TransactionAction *action;
1441 const BlkActionOps *ops;
1442 BlockJobTxn *block_job_txn;
1443 TransactionProperties *txn_props;
1444 QSIMPLEQ_ENTRY(BlkActionState) entry;
1445 };
1446
1447 /* internal snapshot private data */
1448 typedef struct InternalSnapshotState {
1449 BlkActionState common;
1450 BlockDriverState *bs;
1451 AioContext *aio_context;
1452 QEMUSnapshotInfo sn;
1453 bool created;
1454 } InternalSnapshotState;
1455
1456
1457 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1458 {
1459 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1460 error_setg(errp,
1461 "Action '%s' does not support Transaction property "
1462 "completion-mode = %s",
1463 TransactionActionKind_lookup[s->action->type],
1464 ActionCompletionMode_lookup[s->txn_props->completion_mode]);
1465 return -1;
1466 }
1467 return 0;
1468 }
1469
1470 static void internal_snapshot_prepare(BlkActionState *common,
1471 Error **errp)
1472 {
1473 Error *local_err = NULL;
1474 const char *device;
1475 const char *name;
1476 BlockBackend *blk;
1477 BlockDriverState *bs;
1478 QEMUSnapshotInfo old_sn, *sn;
1479 bool ret;
1480 qemu_timeval tv;
1481 BlockdevSnapshotInternal *internal;
1482 InternalSnapshotState *state;
1483 int ret1;
1484
1485 g_assert(common->action->type ==
1486 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1487 internal = common->action->u.blockdev_snapshot_internal_sync;
1488 state = DO_UPCAST(InternalSnapshotState, common, common);
1489
1490 /* 1. parse input */
1491 device = internal->device;
1492 name = internal->name;
1493
1494 /* 2. check for validation */
1495 if (action_check_completion_mode(common, errp) < 0) {
1496 return;
1497 }
1498
1499 blk = blk_by_name(device);
1500 if (!blk) {
1501 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1502 "Device '%s' not found", device);
1503 return;
1504 }
1505
1506 /* AioContext is released in .clean() */
1507 state->aio_context = blk_get_aio_context(blk);
1508 aio_context_acquire(state->aio_context);
1509
1510 if (!blk_is_available(blk)) {
1511 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1512 return;
1513 }
1514 bs = blk_bs(blk);
1515
1516 state->bs = bs;
1517 bdrv_drained_begin(bs);
1518
1519 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1520 return;
1521 }
1522
1523 if (bdrv_is_read_only(bs)) {
1524 error_setg(errp, "Device '%s' is read only", device);
1525 return;
1526 }
1527
1528 if (!bdrv_can_snapshot(bs)) {
1529 error_setg(errp, "Block format '%s' used by device '%s' "
1530 "does not support internal snapshots",
1531 bs->drv->format_name, device);
1532 return;
1533 }
1534
1535 if (!strlen(name)) {
1536 error_setg(errp, "Name is empty");
1537 return;
1538 }
1539
1540 /* check whether a snapshot with name exist */
1541 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1542 &local_err);
1543 if (local_err) {
1544 error_propagate(errp, local_err);
1545 return;
1546 } else if (ret) {
1547 error_setg(errp,
1548 "Snapshot with name '%s' already exists on device '%s'",
1549 name, device);
1550 return;
1551 }
1552
1553 /* 3. take the snapshot */
1554 sn = &state->sn;
1555 pstrcpy(sn->name, sizeof(sn->name), name);
1556 qemu_gettimeofday(&tv);
1557 sn->date_sec = tv.tv_sec;
1558 sn->date_nsec = tv.tv_usec * 1000;
1559 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1560
1561 ret1 = bdrv_snapshot_create(bs, sn);
1562 if (ret1 < 0) {
1563 error_setg_errno(errp, -ret1,
1564 "Failed to create snapshot '%s' on device '%s'",
1565 name, device);
1566 return;
1567 }
1568
1569 /* 4. succeed, mark a snapshot is created */
1570 state->created = true;
1571 }
1572
1573 static void internal_snapshot_abort(BlkActionState *common)
1574 {
1575 InternalSnapshotState *state =
1576 DO_UPCAST(InternalSnapshotState, common, common);
1577 BlockDriverState *bs = state->bs;
1578 QEMUSnapshotInfo *sn = &state->sn;
1579 Error *local_error = NULL;
1580
1581 if (!state->created) {
1582 return;
1583 }
1584
1585 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1586 error_reportf_err(local_error,
1587 "Failed to delete snapshot with id '%s' and "
1588 "name '%s' on device '%s' in abort: ",
1589 sn->id_str, sn->name,
1590 bdrv_get_device_name(bs));
1591 }
1592 }
1593
1594 static void internal_snapshot_clean(BlkActionState *common)
1595 {
1596 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1597 common, common);
1598
1599 if (state->aio_context) {
1600 if (state->bs) {
1601 bdrv_drained_end(state->bs);
1602 }
1603 aio_context_release(state->aio_context);
1604 }
1605 }
1606
1607 /* external snapshot private data */
1608 typedef struct ExternalSnapshotState {
1609 BlkActionState common;
1610 BlockDriverState *old_bs;
1611 BlockDriverState *new_bs;
1612 AioContext *aio_context;
1613 } ExternalSnapshotState;
1614
1615 static void external_snapshot_prepare(BlkActionState *common,
1616 Error **errp)
1617 {
1618 int flags = 0, ret;
1619 QDict *options = NULL;
1620 Error *local_err = NULL;
1621 /* Device and node name of the image to generate the snapshot from */
1622 const char *device;
1623 const char *node_name;
1624 /* Reference to the new image (for 'blockdev-snapshot') */
1625 const char *snapshot_ref;
1626 /* File name of the new image (for 'blockdev-snapshot-sync') */
1627 const char *new_image_file;
1628 ExternalSnapshotState *state =
1629 DO_UPCAST(ExternalSnapshotState, common, common);
1630 TransactionAction *action = common->action;
1631
1632 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1633 * purpose but a different set of parameters */
1634 switch (action->type) {
1635 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1636 {
1637 BlockdevSnapshot *s = action->u.blockdev_snapshot;
1638 device = s->node;
1639 node_name = s->node;
1640 new_image_file = NULL;
1641 snapshot_ref = s->overlay;
1642 }
1643 break;
1644 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1645 {
1646 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1647 device = s->has_device ? s->device : NULL;
1648 node_name = s->has_node_name ? s->node_name : NULL;
1649 new_image_file = s->snapshot_file;
1650 snapshot_ref = NULL;
1651 }
1652 break;
1653 default:
1654 g_assert_not_reached();
1655 }
1656
1657 /* start processing */
1658 if (action_check_completion_mode(common, errp) < 0) {
1659 return;
1660 }
1661
1662 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1663 if (!state->old_bs) {
1664 return;
1665 }
1666
1667 /* Acquire AioContext now so any threads operating on old_bs stop */
1668 state->aio_context = bdrv_get_aio_context(state->old_bs);
1669 aio_context_acquire(state->aio_context);
1670 bdrv_drained_begin(state->old_bs);
1671
1672 if (!bdrv_is_inserted(state->old_bs)) {
1673 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1674 return;
1675 }
1676
1677 if (bdrv_op_is_blocked(state->old_bs,
1678 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1679 return;
1680 }
1681
1682 if (!bdrv_is_read_only(state->old_bs)) {
1683 if (bdrv_flush(state->old_bs)) {
1684 error_setg(errp, QERR_IO_ERROR);
1685 return;
1686 }
1687 }
1688
1689 if (!bdrv_is_first_non_filter(state->old_bs)) {
1690 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1691 return;
1692 }
1693
1694 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1695 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1696 const char *format = s->has_format ? s->format : "qcow2";
1697 enum NewImageMode mode;
1698 const char *snapshot_node_name =
1699 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1700
1701 if (node_name && !snapshot_node_name) {
1702 error_setg(errp, "New snapshot node name missing");
1703 return;
1704 }
1705
1706 if (snapshot_node_name &&
1707 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1708 error_setg(errp, "New snapshot node name already in use");
1709 return;
1710 }
1711
1712 flags = state->old_bs->open_flags;
1713
1714 /* create new image w/backing file */
1715 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1716 if (mode != NEW_IMAGE_MODE_EXISTING) {
1717 bdrv_img_create(new_image_file, format,
1718 state->old_bs->filename,
1719 state->old_bs->drv->format_name,
1720 NULL, -1, flags, &local_err, false);
1721 if (local_err) {
1722 error_propagate(errp, local_err);
1723 return;
1724 }
1725 }
1726
1727 options = qdict_new();
1728 if (s->has_snapshot_node_name) {
1729 qdict_put(options, "node-name",
1730 qstring_from_str(snapshot_node_name));
1731 }
1732 qdict_put(options, "driver", qstring_from_str(format));
1733
1734 flags |= BDRV_O_NO_BACKING;
1735 }
1736
1737 assert(state->new_bs == NULL);
1738 ret = bdrv_open(&state->new_bs, new_image_file, snapshot_ref, options,
1739 flags, errp);
1740 /* We will manually add the backing_hd field to the bs later */
1741 if (ret != 0) {
1742 return;
1743 }
1744
1745 if (state->new_bs->blk != NULL) {
1746 error_setg(errp, "The snapshot is already in use by %s",
1747 blk_name(state->new_bs->blk));
1748 return;
1749 }
1750
1751 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1752 errp)) {
1753 return;
1754 }
1755
1756 if (state->new_bs->backing != NULL) {
1757 error_setg(errp, "The snapshot already has a backing image");
1758 return;
1759 }
1760
1761 if (!state->new_bs->drv->supports_backing) {
1762 error_setg(errp, "The snapshot does not support backing images");
1763 }
1764 }
1765
1766 static void external_snapshot_commit(BlkActionState *common)
1767 {
1768 ExternalSnapshotState *state =
1769 DO_UPCAST(ExternalSnapshotState, common, common);
1770
1771 bdrv_set_aio_context(state->new_bs, state->aio_context);
1772
1773 /* This removes our old bs and adds the new bs */
1774 bdrv_append(state->new_bs, state->old_bs);
1775 /* We don't need (or want) to use the transactional
1776 * bdrv_reopen_multiple() across all the entries at once, because we
1777 * don't want to abort all of them if one of them fails the reopen */
1778 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1779 NULL);
1780 }
1781
1782 static void external_snapshot_abort(BlkActionState *common)
1783 {
1784 ExternalSnapshotState *state =
1785 DO_UPCAST(ExternalSnapshotState, common, common);
1786 if (state->new_bs) {
1787 bdrv_unref(state->new_bs);
1788 }
1789 }
1790
1791 static void external_snapshot_clean(BlkActionState *common)
1792 {
1793 ExternalSnapshotState *state =
1794 DO_UPCAST(ExternalSnapshotState, common, common);
1795 if (state->aio_context) {
1796 bdrv_drained_end(state->old_bs);
1797 aio_context_release(state->aio_context);
1798 }
1799 }
1800
1801 typedef struct DriveBackupState {
1802 BlkActionState common;
1803 BlockDriverState *bs;
1804 AioContext *aio_context;
1805 BlockJob *job;
1806 } DriveBackupState;
1807
1808 static void do_drive_backup(const char *device, const char *target,
1809 bool has_format, const char *format,
1810 enum MirrorSyncMode sync,
1811 bool has_mode, enum NewImageMode mode,
1812 bool has_speed, int64_t speed,
1813 bool has_bitmap, const char *bitmap,
1814 bool has_on_source_error,
1815 BlockdevOnError on_source_error,
1816 bool has_on_target_error,
1817 BlockdevOnError on_target_error,
1818 BlockJobTxn *txn, Error **errp);
1819
1820 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1821 {
1822 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1823 BlockBackend *blk;
1824 DriveBackup *backup;
1825 Error *local_err = NULL;
1826
1827 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1828 backup = common->action->u.drive_backup;
1829
1830 blk = blk_by_name(backup->device);
1831 if (!blk) {
1832 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1833 "Device '%s' not found", backup->device);
1834 return;
1835 }
1836
1837 if (!blk_is_available(blk)) {
1838 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1839 return;
1840 }
1841
1842 /* AioContext is released in .clean() */
1843 state->aio_context = blk_get_aio_context(blk);
1844 aio_context_acquire(state->aio_context);
1845 bdrv_drained_begin(blk_bs(blk));
1846 state->bs = blk_bs(blk);
1847
1848 do_drive_backup(backup->device, backup->target,
1849 backup->has_format, backup->format,
1850 backup->sync,
1851 backup->has_mode, backup->mode,
1852 backup->has_speed, backup->speed,
1853 backup->has_bitmap, backup->bitmap,
1854 backup->has_on_source_error, backup->on_source_error,
1855 backup->has_on_target_error, backup->on_target_error,
1856 common->block_job_txn, &local_err);
1857 if (local_err) {
1858 error_propagate(errp, local_err);
1859 return;
1860 }
1861
1862 state->job = state->bs->job;
1863 }
1864
1865 static void drive_backup_abort(BlkActionState *common)
1866 {
1867 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1868 BlockDriverState *bs = state->bs;
1869
1870 /* Only cancel if it's the job we started */
1871 if (bs && bs->job && bs->job == state->job) {
1872 block_job_cancel_sync(bs->job);
1873 }
1874 }
1875
1876 static void drive_backup_clean(BlkActionState *common)
1877 {
1878 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1879
1880 if (state->aio_context) {
1881 bdrv_drained_end(state->bs);
1882 aio_context_release(state->aio_context);
1883 }
1884 }
1885
1886 typedef struct BlockdevBackupState {
1887 BlkActionState common;
1888 BlockDriverState *bs;
1889 BlockJob *job;
1890 AioContext *aio_context;
1891 } BlockdevBackupState;
1892
1893 static void do_blockdev_backup(const char *device, const char *target,
1894 enum MirrorSyncMode sync,
1895 bool has_speed, int64_t speed,
1896 bool has_on_source_error,
1897 BlockdevOnError on_source_error,
1898 bool has_on_target_error,
1899 BlockdevOnError on_target_error,
1900 BlockJobTxn *txn, Error **errp);
1901
1902 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1903 {
1904 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1905 BlockdevBackup *backup;
1906 BlockBackend *blk, *target;
1907 Error *local_err = NULL;
1908
1909 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1910 backup = common->action->u.blockdev_backup;
1911
1912 blk = blk_by_name(backup->device);
1913 if (!blk) {
1914 error_setg(errp, "Device '%s' not found", backup->device);
1915 return;
1916 }
1917
1918 if (!blk_is_available(blk)) {
1919 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1920 return;
1921 }
1922
1923 target = blk_by_name(backup->target);
1924 if (!target) {
1925 error_setg(errp, "Device '%s' not found", backup->target);
1926 return;
1927 }
1928
1929 /* AioContext is released in .clean() */
1930 state->aio_context = blk_get_aio_context(blk);
1931 if (state->aio_context != blk_get_aio_context(target)) {
1932 state->aio_context = NULL;
1933 error_setg(errp, "Backup between two IO threads is not implemented");
1934 return;
1935 }
1936 aio_context_acquire(state->aio_context);
1937 state->bs = blk_bs(blk);
1938 bdrv_drained_begin(state->bs);
1939
1940 do_blockdev_backup(backup->device, backup->target,
1941 backup->sync,
1942 backup->has_speed, backup->speed,
1943 backup->has_on_source_error, backup->on_source_error,
1944 backup->has_on_target_error, backup->on_target_error,
1945 common->block_job_txn, &local_err);
1946 if (local_err) {
1947 error_propagate(errp, local_err);
1948 return;
1949 }
1950
1951 state->job = state->bs->job;
1952 }
1953
1954 static void blockdev_backup_abort(BlkActionState *common)
1955 {
1956 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1957 BlockDriverState *bs = state->bs;
1958
1959 /* Only cancel if it's the job we started */
1960 if (bs && bs->job && bs->job == state->job) {
1961 block_job_cancel_sync(bs->job);
1962 }
1963 }
1964
1965 static void blockdev_backup_clean(BlkActionState *common)
1966 {
1967 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1968
1969 if (state->aio_context) {
1970 bdrv_drained_end(state->bs);
1971 aio_context_release(state->aio_context);
1972 }
1973 }
1974
1975 typedef struct BlockDirtyBitmapState {
1976 BlkActionState common;
1977 BdrvDirtyBitmap *bitmap;
1978 BlockDriverState *bs;
1979 AioContext *aio_context;
1980 HBitmap *backup;
1981 bool prepared;
1982 } BlockDirtyBitmapState;
1983
1984 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
1985 Error **errp)
1986 {
1987 Error *local_err = NULL;
1988 BlockDirtyBitmapAdd *action;
1989 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1990 common, common);
1991
1992 if (action_check_completion_mode(common, errp) < 0) {
1993 return;
1994 }
1995
1996 action = common->action->u.block_dirty_bitmap_add;
1997 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1998 qmp_block_dirty_bitmap_add(action->node, action->name,
1999 action->has_granularity, action->granularity,
2000 &local_err);
2001
2002 if (!local_err) {
2003 state->prepared = true;
2004 } else {
2005 error_propagate(errp, local_err);
2006 }
2007 }
2008
2009 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2010 {
2011 BlockDirtyBitmapAdd *action;
2012 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2013 common, common);
2014
2015 action = common->action->u.block_dirty_bitmap_add;
2016 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2017 * then the node reference and bitmap name must have been valid.
2018 */
2019 if (state->prepared) {
2020 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2021 }
2022 }
2023
2024 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2025 Error **errp)
2026 {
2027 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2028 common, common);
2029 BlockDirtyBitmap *action;
2030
2031 if (action_check_completion_mode(common, errp) < 0) {
2032 return;
2033 }
2034
2035 action = common->action->u.block_dirty_bitmap_clear;
2036 state->bitmap = block_dirty_bitmap_lookup(action->node,
2037 action->name,
2038 &state->bs,
2039 &state->aio_context,
2040 errp);
2041 if (!state->bitmap) {
2042 return;
2043 }
2044
2045 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2046 error_setg(errp, "Cannot modify a frozen bitmap");
2047 return;
2048 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2049 error_setg(errp, "Cannot clear a disabled bitmap");
2050 return;
2051 }
2052
2053 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2054 /* AioContext is released in .clean() */
2055 }
2056
2057 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2058 {
2059 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2060 common, common);
2061
2062 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2063 }
2064
2065 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2066 {
2067 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2068 common, common);
2069
2070 hbitmap_free(state->backup);
2071 }
2072
2073 static void block_dirty_bitmap_clear_clean(BlkActionState *common)
2074 {
2075 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2076 common, common);
2077
2078 if (state->aio_context) {
2079 aio_context_release(state->aio_context);
2080 }
2081 }
2082
2083 static void abort_prepare(BlkActionState *common, Error **errp)
2084 {
2085 error_setg(errp, "Transaction aborted using Abort action");
2086 }
2087
2088 static void abort_commit(BlkActionState *common)
2089 {
2090 g_assert_not_reached(); /* this action never succeeds */
2091 }
2092
2093 static const BlkActionOps actions[] = {
2094 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2095 .instance_size = sizeof(ExternalSnapshotState),
2096 .prepare = external_snapshot_prepare,
2097 .commit = external_snapshot_commit,
2098 .abort = external_snapshot_abort,
2099 .clean = external_snapshot_clean,
2100 },
2101 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2102 .instance_size = sizeof(ExternalSnapshotState),
2103 .prepare = external_snapshot_prepare,
2104 .commit = external_snapshot_commit,
2105 .abort = external_snapshot_abort,
2106 .clean = external_snapshot_clean,
2107 },
2108 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2109 .instance_size = sizeof(DriveBackupState),
2110 .prepare = drive_backup_prepare,
2111 .abort = drive_backup_abort,
2112 .clean = drive_backup_clean,
2113 },
2114 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2115 .instance_size = sizeof(BlockdevBackupState),
2116 .prepare = blockdev_backup_prepare,
2117 .abort = blockdev_backup_abort,
2118 .clean = blockdev_backup_clean,
2119 },
2120 [TRANSACTION_ACTION_KIND_ABORT] = {
2121 .instance_size = sizeof(BlkActionState),
2122 .prepare = abort_prepare,
2123 .commit = abort_commit,
2124 },
2125 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2126 .instance_size = sizeof(InternalSnapshotState),
2127 .prepare = internal_snapshot_prepare,
2128 .abort = internal_snapshot_abort,
2129 .clean = internal_snapshot_clean,
2130 },
2131 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2132 .instance_size = sizeof(BlockDirtyBitmapState),
2133 .prepare = block_dirty_bitmap_add_prepare,
2134 .abort = block_dirty_bitmap_add_abort,
2135 },
2136 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2137 .instance_size = sizeof(BlockDirtyBitmapState),
2138 .prepare = block_dirty_bitmap_clear_prepare,
2139 .commit = block_dirty_bitmap_clear_commit,
2140 .abort = block_dirty_bitmap_clear_abort,
2141 .clean = block_dirty_bitmap_clear_clean,
2142 }
2143 };
2144
2145 /**
2146 * Allocate a TransactionProperties structure if necessary, and fill
2147 * that structure with desired defaults if they are unset.
2148 */
2149 static TransactionProperties *get_transaction_properties(
2150 TransactionProperties *props)
2151 {
2152 if (!props) {
2153 props = g_new0(TransactionProperties, 1);
2154 }
2155
2156 if (!props->has_completion_mode) {
2157 props->has_completion_mode = true;
2158 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2159 }
2160
2161 return props;
2162 }
2163
2164 /*
2165 * 'Atomic' group operations. The operations are performed as a set, and if
2166 * any fail then we roll back all operations in the group.
2167 */
2168 void qmp_transaction(TransactionActionList *dev_list,
2169 bool has_props,
2170 struct TransactionProperties *props,
2171 Error **errp)
2172 {
2173 TransactionActionList *dev_entry = dev_list;
2174 BlockJobTxn *block_job_txn = NULL;
2175 BlkActionState *state, *next;
2176 Error *local_err = NULL;
2177
2178 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2179 QSIMPLEQ_INIT(&snap_bdrv_states);
2180
2181 /* Does this transaction get canceled as a group on failure?
2182 * If not, we don't really need to make a BlockJobTxn.
2183 */
2184 props = get_transaction_properties(props);
2185 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2186 block_job_txn = block_job_txn_new();
2187 }
2188
2189 /* drain all i/o before any operations */
2190 bdrv_drain_all();
2191
2192 /* We don't do anything in this loop that commits us to the operations */
2193 while (NULL != dev_entry) {
2194 TransactionAction *dev_info = NULL;
2195 const BlkActionOps *ops;
2196
2197 dev_info = dev_entry->value;
2198 dev_entry = dev_entry->next;
2199
2200 assert(dev_info->type < ARRAY_SIZE(actions));
2201
2202 ops = &actions[dev_info->type];
2203 assert(ops->instance_size > 0);
2204
2205 state = g_malloc0(ops->instance_size);
2206 state->ops = ops;
2207 state->action = dev_info;
2208 state->block_job_txn = block_job_txn;
2209 state->txn_props = props;
2210 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2211
2212 state->ops->prepare(state, &local_err);
2213 if (local_err) {
2214 error_propagate(errp, local_err);
2215 goto delete_and_fail;
2216 }
2217 }
2218
2219 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2220 if (state->ops->commit) {
2221 state->ops->commit(state);
2222 }
2223 }
2224
2225 /* success */
2226 goto exit;
2227
2228 delete_and_fail:
2229 /* failure, and it is all-or-none; roll back all operations */
2230 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2231 if (state->ops->abort) {
2232 state->ops->abort(state);
2233 }
2234 }
2235 exit:
2236 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2237 if (state->ops->clean) {
2238 state->ops->clean(state);
2239 }
2240 g_free(state);
2241 }
2242 if (!has_props) {
2243 qapi_free_TransactionProperties(props);
2244 }
2245 block_job_txn_unref(block_job_txn);
2246 }
2247
2248 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
2249 {
2250 Error *local_err = NULL;
2251
2252 qmp_blockdev_open_tray(device, has_force, force, &local_err);
2253 if (local_err) {
2254 error_propagate(errp, local_err);
2255 return;
2256 }
2257
2258 qmp_x_blockdev_remove_medium(device, errp);
2259 }
2260
2261 void qmp_block_passwd(bool has_device, const char *device,
2262 bool has_node_name, const char *node_name,
2263 const char *password, Error **errp)
2264 {
2265 Error *local_err = NULL;
2266 BlockDriverState *bs;
2267 AioContext *aio_context;
2268
2269 bs = bdrv_lookup_bs(has_device ? device : NULL,
2270 has_node_name ? node_name : NULL,
2271 &local_err);
2272 if (local_err) {
2273 error_propagate(errp, local_err);
2274 return;
2275 }
2276
2277 aio_context = bdrv_get_aio_context(bs);
2278 aio_context_acquire(aio_context);
2279
2280 bdrv_add_key(bs, password, errp);
2281
2282 aio_context_release(aio_context);
2283 }
2284
2285 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force,
2286 Error **errp)
2287 {
2288 BlockBackend *blk;
2289 bool locked;
2290
2291 if (!has_force) {
2292 force = false;
2293 }
2294
2295 blk = blk_by_name(device);
2296 if (!blk) {
2297 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2298 "Device '%s' not found", device);
2299 return;
2300 }
2301
2302 if (!blk_dev_has_removable_media(blk)) {
2303 error_setg(errp, "Device '%s' is not removable", device);
2304 return;
2305 }
2306
2307 if (blk_dev_is_tray_open(blk)) {
2308 return;
2309 }
2310
2311 locked = blk_dev_is_medium_locked(blk);
2312 if (locked) {
2313 blk_dev_eject_request(blk, force);
2314 }
2315
2316 if (!locked || force) {
2317 blk_dev_change_media_cb(blk, false);
2318 }
2319 }
2320
2321 void qmp_blockdev_close_tray(const char *device, Error **errp)
2322 {
2323 BlockBackend *blk;
2324
2325 blk = blk_by_name(device);
2326 if (!blk) {
2327 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2328 "Device '%s' not found", device);
2329 return;
2330 }
2331
2332 if (!blk_dev_has_removable_media(blk)) {
2333 error_setg(errp, "Device '%s' is not removable", device);
2334 return;
2335 }
2336
2337 if (!blk_dev_is_tray_open(blk)) {
2338 return;
2339 }
2340
2341 blk_dev_change_media_cb(blk, true);
2342 }
2343
2344 void qmp_x_blockdev_remove_medium(const char *device, Error **errp)
2345 {
2346 BlockBackend *blk;
2347 BlockDriverState *bs;
2348 AioContext *aio_context;
2349 bool has_device;
2350
2351 blk = blk_by_name(device);
2352 if (!blk) {
2353 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2354 "Device '%s' not found", device);
2355 return;
2356 }
2357
2358 /* For BBs without a device, we can exchange the BDS tree at will */
2359 has_device = blk_get_attached_dev(blk);
2360
2361 if (has_device && !blk_dev_has_removable_media(blk)) {
2362 error_setg(errp, "Device '%s' is not removable", device);
2363 return;
2364 }
2365
2366 if (has_device && !blk_dev_is_tray_open(blk)) {
2367 error_setg(errp, "Tray of device '%s' is not open", device);
2368 return;
2369 }
2370
2371 bs = blk_bs(blk);
2372 if (!bs) {
2373 return;
2374 }
2375
2376 aio_context = bdrv_get_aio_context(bs);
2377 aio_context_acquire(aio_context);
2378
2379 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2380 goto out;
2381 }
2382
2383 /* This follows the convention established by bdrv_make_anon() */
2384 if (bs->device_list.tqe_prev) {
2385 QTAILQ_REMOVE(&bdrv_states, bs, device_list);
2386 bs->device_list.tqe_prev = NULL;
2387 }
2388
2389 blk_remove_bs(blk);
2390
2391 out:
2392 aio_context_release(aio_context);
2393 }
2394
2395 static void qmp_blockdev_insert_anon_medium(const char *device,
2396 BlockDriverState *bs, Error **errp)
2397 {
2398 BlockBackend *blk;
2399 bool has_device;
2400
2401 blk = blk_by_name(device);
2402 if (!blk) {
2403 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2404 "Device '%s' not found", device);
2405 return;
2406 }
2407
2408 /* For BBs without a device, we can exchange the BDS tree at will */
2409 has_device = blk_get_attached_dev(blk);
2410
2411 if (has_device && !blk_dev_has_removable_media(blk)) {
2412 error_setg(errp, "Device '%s' is not removable", device);
2413 return;
2414 }
2415
2416 if (has_device && !blk_dev_is_tray_open(blk)) {
2417 error_setg(errp, "Tray of device '%s' is not open", device);
2418 return;
2419 }
2420
2421 if (blk_bs(blk)) {
2422 error_setg(errp, "There already is a medium in device '%s'", device);
2423 return;
2424 }
2425
2426 blk_insert_bs(blk, bs);
2427
2428 QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list);
2429 }
2430
2431 void qmp_x_blockdev_insert_medium(const char *device, const char *node_name,
2432 Error **errp)
2433 {
2434 BlockDriverState *bs;
2435
2436 bs = bdrv_find_node(node_name);
2437 if (!bs) {
2438 error_setg(errp, "Node '%s' not found", node_name);
2439 return;
2440 }
2441
2442 if (bs->blk) {
2443 error_setg(errp, "Node '%s' is already in use by '%s'", node_name,
2444 blk_name(bs->blk));
2445 return;
2446 }
2447
2448 qmp_blockdev_insert_anon_medium(device, bs, errp);
2449 }
2450
2451 void qmp_blockdev_change_medium(const char *device, const char *filename,
2452 bool has_format, const char *format,
2453 bool has_read_only,
2454 BlockdevChangeReadOnlyMode read_only,
2455 Error **errp)
2456 {
2457 BlockBackend *blk;
2458 BlockDriverState *medium_bs = NULL;
2459 int bdrv_flags, ret;
2460 QDict *options = NULL;
2461 Error *err = NULL;
2462
2463 blk = blk_by_name(device);
2464 if (!blk) {
2465 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2466 "Device '%s' not found", device);
2467 goto fail;
2468 }
2469
2470 if (blk_bs(blk)) {
2471 blk_update_root_state(blk);
2472 }
2473
2474 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2475
2476 if (!has_read_only) {
2477 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2478 }
2479
2480 switch (read_only) {
2481 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2482 break;
2483
2484 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2485 bdrv_flags &= ~BDRV_O_RDWR;
2486 break;
2487
2488 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2489 bdrv_flags |= BDRV_O_RDWR;
2490 break;
2491
2492 default:
2493 abort();
2494 }
2495
2496 if (has_format) {
2497 options = qdict_new();
2498 qdict_put(options, "driver", qstring_from_str(format));
2499 }
2500
2501 assert(!medium_bs);
2502 ret = bdrv_open(&medium_bs, filename, NULL, options, bdrv_flags, errp);
2503 if (ret < 0) {
2504 goto fail;
2505 }
2506
2507 blk_apply_root_state(blk, medium_bs);
2508
2509 bdrv_add_key(medium_bs, NULL, &err);
2510 if (err) {
2511 error_propagate(errp, err);
2512 goto fail;
2513 }
2514
2515 qmp_blockdev_open_tray(device, false, false, &err);
2516 if (err) {
2517 error_propagate(errp, err);
2518 goto fail;
2519 }
2520
2521 qmp_x_blockdev_remove_medium(device, &err);
2522 if (err) {
2523 error_propagate(errp, err);
2524 goto fail;
2525 }
2526
2527 qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
2528 if (err) {
2529 error_propagate(errp, err);
2530 goto fail;
2531 }
2532
2533 qmp_blockdev_close_tray(device, errp);
2534
2535 fail:
2536 /* If the medium has been inserted, the device has its own reference, so
2537 * ours must be relinquished; and if it has not been inserted successfully,
2538 * the reference must be relinquished anyway */
2539 bdrv_unref(medium_bs);
2540 }
2541
2542 /* throttling disk I/O limits */
2543 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2544 int64_t bps_wr,
2545 int64_t iops,
2546 int64_t iops_rd,
2547 int64_t iops_wr,
2548 bool has_bps_max,
2549 int64_t bps_max,
2550 bool has_bps_rd_max,
2551 int64_t bps_rd_max,
2552 bool has_bps_wr_max,
2553 int64_t bps_wr_max,
2554 bool has_iops_max,
2555 int64_t iops_max,
2556 bool has_iops_rd_max,
2557 int64_t iops_rd_max,
2558 bool has_iops_wr_max,
2559 int64_t iops_wr_max,
2560 bool has_iops_size,
2561 int64_t iops_size,
2562 bool has_group,
2563 const char *group, Error **errp)
2564 {
2565 ThrottleConfig cfg;
2566 BlockDriverState *bs;
2567 BlockBackend *blk;
2568 AioContext *aio_context;
2569
2570 blk = blk_by_name(device);
2571 if (!blk) {
2572 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2573 "Device '%s' not found", device);
2574 return;
2575 }
2576
2577 aio_context = blk_get_aio_context(blk);
2578 aio_context_acquire(aio_context);
2579
2580 bs = blk_bs(blk);
2581 if (!bs) {
2582 error_setg(errp, "Device '%s' has no medium", device);
2583 goto out;
2584 }
2585
2586 memset(&cfg, 0, sizeof(cfg));
2587 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2588 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2589 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2590
2591 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2592 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2593 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2594
2595 if (has_bps_max) {
2596 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2597 }
2598 if (has_bps_rd_max) {
2599 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2600 }
2601 if (has_bps_wr_max) {
2602 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2603 }
2604 if (has_iops_max) {
2605 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2606 }
2607 if (has_iops_rd_max) {
2608 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2609 }
2610 if (has_iops_wr_max) {
2611 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2612 }
2613
2614 if (has_iops_size) {
2615 cfg.op_size = iops_size;
2616 }
2617
2618 if (!check_throttle_config(&cfg, errp)) {
2619 goto out;
2620 }
2621
2622 if (throttle_enabled(&cfg)) {
2623 /* Enable I/O limits if they're not enabled yet, otherwise
2624 * just update the throttling group. */
2625 if (!bs->throttle_state) {
2626 bdrv_io_limits_enable(bs, has_group ? group : device);
2627 } else if (has_group) {
2628 bdrv_io_limits_update_group(bs, group);
2629 }
2630 /* Set the new throttling configuration */
2631 bdrv_set_io_limits(bs, &cfg);
2632 } else if (bs->throttle_state) {
2633 /* If all throttling settings are set to 0, disable I/O limits */
2634 bdrv_io_limits_disable(bs);
2635 }
2636
2637 out:
2638 aio_context_release(aio_context);
2639 }
2640
2641 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2642 bool has_granularity, uint32_t granularity,
2643 Error **errp)
2644 {
2645 AioContext *aio_context;
2646 BlockDriverState *bs;
2647
2648 if (!name || name[0] == '\0') {
2649 error_setg(errp, "Bitmap name cannot be empty");
2650 return;
2651 }
2652
2653 bs = bdrv_lookup_bs(node, node, errp);
2654 if (!bs) {
2655 return;
2656 }
2657
2658 aio_context = bdrv_get_aio_context(bs);
2659 aio_context_acquire(aio_context);
2660
2661 if (has_granularity) {
2662 if (granularity < 512 || !is_power_of_2(granularity)) {
2663 error_setg(errp, "Granularity must be power of 2 "
2664 "and at least 512");
2665 goto out;
2666 }
2667 } else {
2668 /* Default to cluster size, if available: */
2669 granularity = bdrv_get_default_bitmap_granularity(bs);
2670 }
2671
2672 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2673
2674 out:
2675 aio_context_release(aio_context);
2676 }
2677
2678 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2679 Error **errp)
2680 {
2681 AioContext *aio_context;
2682 BlockDriverState *bs;
2683 BdrvDirtyBitmap *bitmap;
2684
2685 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2686 if (!bitmap || !bs) {
2687 return;
2688 }
2689
2690 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2691 error_setg(errp,
2692 "Bitmap '%s' is currently frozen and cannot be removed",
2693 name);
2694 goto out;
2695 }
2696 bdrv_dirty_bitmap_make_anon(bitmap);
2697 bdrv_release_dirty_bitmap(bs, bitmap);
2698
2699 out:
2700 aio_context_release(aio_context);
2701 }
2702
2703 /**
2704 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2705 * immediately after a full backup operation.
2706 */
2707 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2708 Error **errp)
2709 {
2710 AioContext *aio_context;
2711 BdrvDirtyBitmap *bitmap;
2712 BlockDriverState *bs;
2713
2714 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2715 if (!bitmap || !bs) {
2716 return;
2717 }
2718
2719 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2720 error_setg(errp,
2721 "Bitmap '%s' is currently frozen and cannot be modified",
2722 name);
2723 goto out;
2724 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2725 error_setg(errp,
2726 "Bitmap '%s' is currently disabled and cannot be cleared",
2727 name);
2728 goto out;
2729 }
2730
2731 bdrv_clear_dirty_bitmap(bitmap, NULL);
2732
2733 out:
2734 aio_context_release(aio_context);
2735 }
2736
2737 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2738 {
2739 const char *id = qdict_get_str(qdict, "id");
2740 BlockBackend *blk;
2741 BlockDriverState *bs;
2742 AioContext *aio_context;
2743 Error *local_err = NULL;
2744
2745 blk = blk_by_name(id);
2746 if (!blk) {
2747 error_report("Device '%s' not found", id);
2748 return;
2749 }
2750
2751 if (!blk_legacy_dinfo(blk)) {
2752 error_report("Deleting device added with blockdev-add"
2753 " is not supported");
2754 return;
2755 }
2756
2757 aio_context = blk_get_aio_context(blk);
2758 aio_context_acquire(aio_context);
2759
2760 bs = blk_bs(blk);
2761 if (bs) {
2762 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2763 error_report_err(local_err);
2764 aio_context_release(aio_context);
2765 return;
2766 }
2767
2768 bdrv_close(bs);
2769 }
2770
2771 /* if we have a device attached to this BlockDriverState
2772 * then we need to make the drive anonymous until the device
2773 * can be removed. If this is a drive with no device backing
2774 * then we can just get rid of the block driver state right here.
2775 */
2776 if (blk_get_attached_dev(blk)) {
2777 blk_hide_on_behalf_of_hmp_drive_del(blk);
2778 /* Further I/O must not pause the guest */
2779 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2780 BLOCKDEV_ON_ERROR_REPORT);
2781 } else {
2782 blk_unref(blk);
2783 }
2784
2785 aio_context_release(aio_context);
2786 }
2787
2788 void qmp_block_resize(bool has_device, const char *device,
2789 bool has_node_name, const char *node_name,
2790 int64_t size, Error **errp)
2791 {
2792 Error *local_err = NULL;
2793 BlockDriverState *bs;
2794 AioContext *aio_context;
2795 int ret;
2796
2797 bs = bdrv_lookup_bs(has_device ? device : NULL,
2798 has_node_name ? node_name : NULL,
2799 &local_err);
2800 if (local_err) {
2801 error_propagate(errp, local_err);
2802 return;
2803 }
2804
2805 aio_context = bdrv_get_aio_context(bs);
2806 aio_context_acquire(aio_context);
2807
2808 if (!bdrv_is_first_non_filter(bs)) {
2809 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2810 goto out;
2811 }
2812
2813 if (size < 0) {
2814 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2815 goto out;
2816 }
2817
2818 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2819 error_setg(errp, QERR_DEVICE_IN_USE, device);
2820 goto out;
2821 }
2822
2823 /* complete all in-flight operations before resizing the device */
2824 bdrv_drain_all();
2825
2826 ret = bdrv_truncate(bs, size);
2827 switch (ret) {
2828 case 0:
2829 break;
2830 case -ENOMEDIUM:
2831 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2832 break;
2833 case -ENOTSUP:
2834 error_setg(errp, QERR_UNSUPPORTED);
2835 break;
2836 case -EACCES:
2837 error_setg(errp, "Device '%s' is read only", device);
2838 break;
2839 case -EBUSY:
2840 error_setg(errp, QERR_DEVICE_IN_USE, device);
2841 break;
2842 default:
2843 error_setg_errno(errp, -ret, "Could not resize");
2844 break;
2845 }
2846
2847 out:
2848 aio_context_release(aio_context);
2849 }
2850
2851 static void block_job_cb(void *opaque, int ret)
2852 {
2853 /* Note that this function may be executed from another AioContext besides
2854 * the QEMU main loop. If you need to access anything that assumes the
2855 * QEMU global mutex, use a BH or introduce a mutex.
2856 */
2857
2858 BlockDriverState *bs = opaque;
2859 const char *msg = NULL;
2860
2861 trace_block_job_cb(bs, bs->job, ret);
2862
2863 assert(bs->job);
2864
2865 if (ret < 0) {
2866 msg = strerror(-ret);
2867 }
2868
2869 if (block_job_is_cancelled(bs->job)) {
2870 block_job_event_cancelled(bs->job);
2871 } else {
2872 block_job_event_completed(bs->job, msg);
2873 }
2874 }
2875
2876 void qmp_block_stream(const char *device,
2877 bool has_base, const char *base,
2878 bool has_backing_file, const char *backing_file,
2879 bool has_speed, int64_t speed,
2880 bool has_on_error, BlockdevOnError on_error,
2881 Error **errp)
2882 {
2883 BlockBackend *blk;
2884 BlockDriverState *bs;
2885 BlockDriverState *base_bs = NULL;
2886 AioContext *aio_context;
2887 Error *local_err = NULL;
2888 const char *base_name = NULL;
2889
2890 if (!has_on_error) {
2891 on_error = BLOCKDEV_ON_ERROR_REPORT;
2892 }
2893
2894 blk = blk_by_name(device);
2895 if (!blk) {
2896 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2897 "Device '%s' not found", device);
2898 return;
2899 }
2900
2901 aio_context = blk_get_aio_context(blk);
2902 aio_context_acquire(aio_context);
2903
2904 if (!blk_is_available(blk)) {
2905 error_setg(errp, "Device '%s' has no medium", device);
2906 goto out;
2907 }
2908 bs = blk_bs(blk);
2909
2910 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2911 goto out;
2912 }
2913
2914 if (has_base) {
2915 base_bs = bdrv_find_backing_image(bs, base);
2916 if (base_bs == NULL) {
2917 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2918 goto out;
2919 }
2920 assert(bdrv_get_aio_context(base_bs) == aio_context);
2921 base_name = base;
2922 }
2923
2924 /* if we are streaming the entire chain, the result will have no backing
2925 * file, and specifying one is therefore an error */
2926 if (base_bs == NULL && has_backing_file) {
2927 error_setg(errp, "backing file specified, but streaming the "
2928 "entire chain");
2929 goto out;
2930 }
2931
2932 /* backing_file string overrides base bs filename */
2933 base_name = has_backing_file ? backing_file : base_name;
2934
2935 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2936 on_error, block_job_cb, bs, &local_err);
2937 if (local_err) {
2938 error_propagate(errp, local_err);
2939 goto out;
2940 }
2941
2942 trace_qmp_block_stream(bs, bs->job);
2943
2944 out:
2945 aio_context_release(aio_context);
2946 }
2947
2948 void qmp_block_commit(const char *device,
2949 bool has_base, const char *base,
2950 bool has_top, const char *top,
2951 bool has_backing_file, const char *backing_file,
2952 bool has_speed, int64_t speed,
2953 Error **errp)
2954 {
2955 BlockBackend *blk;
2956 BlockDriverState *bs;
2957 BlockDriverState *base_bs, *top_bs;
2958 AioContext *aio_context;
2959 Error *local_err = NULL;
2960 /* This will be part of the QMP command, if/when the
2961 * BlockdevOnError change for blkmirror makes it in
2962 */
2963 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2964
2965 if (!has_speed) {
2966 speed = 0;
2967 }
2968
2969 /* Important Note:
2970 * libvirt relies on the DeviceNotFound error class in order to probe for
2971 * live commit feature versions; for this to work, we must make sure to
2972 * perform the device lookup before any generic errors that may occur in a
2973 * scenario in which all optional arguments are omitted. */
2974 blk = blk_by_name(device);
2975 if (!blk) {
2976 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2977 "Device '%s' not found", device);
2978 return;
2979 }
2980
2981 aio_context = blk_get_aio_context(blk);
2982 aio_context_acquire(aio_context);
2983
2984 if (!blk_is_available(blk)) {
2985 error_setg(errp, "Device '%s' has no medium", device);
2986 goto out;
2987 }
2988 bs = blk_bs(blk);
2989
2990 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2991 goto out;
2992 }
2993
2994 /* default top_bs is the active layer */
2995 top_bs = bs;
2996
2997 if (has_top && top) {
2998 if (strcmp(bs->filename, top) != 0) {
2999 top_bs = bdrv_find_backing_image(bs, top);
3000 }
3001 }
3002
3003 if (top_bs == NULL) {
3004 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3005 goto out;
3006 }
3007
3008 assert(bdrv_get_aio_context(top_bs) == aio_context);
3009
3010 if (has_base && base) {
3011 base_bs = bdrv_find_backing_image(top_bs, base);
3012 } else {
3013 base_bs = bdrv_find_base(top_bs);
3014 }
3015
3016 if (base_bs == NULL) {
3017 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3018 goto out;
3019 }
3020
3021 assert(bdrv_get_aio_context(base_bs) == aio_context);
3022
3023 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3024 goto out;
3025 }
3026
3027 /* Do not allow attempts to commit an image into itself */
3028 if (top_bs == base_bs) {
3029 error_setg(errp, "cannot commit an image into itself");
3030 goto out;
3031 }
3032
3033 if (top_bs == bs) {
3034 if (has_backing_file) {
3035 error_setg(errp, "'backing-file' specified,"
3036 " but 'top' is the active layer");
3037 goto out;
3038 }
3039 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
3040 bs, &local_err);
3041 } else {
3042 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
3043 has_backing_file ? backing_file : NULL, &local_err);
3044 }
3045 if (local_err != NULL) {
3046 error_propagate(errp, local_err);
3047 goto out;
3048 }
3049
3050 out:
3051 aio_context_release(aio_context);
3052 }
3053
3054 static void do_drive_backup(const char *device, const char *target,
3055 bool has_format, const char *format,
3056 enum MirrorSyncMode sync,
3057 bool has_mode, enum NewImageMode mode,
3058 bool has_speed, int64_t speed,
3059 bool has_bitmap, const char *bitmap,
3060 bool has_on_source_error,
3061 BlockdevOnError on_source_error,
3062 bool has_on_target_error,
3063 BlockdevOnError on_target_error,
3064 BlockJobTxn *txn, Error **errp)
3065 {
3066 BlockBackend *blk;
3067 BlockDriverState *bs;
3068 BlockDriverState *target_bs;
3069 BlockDriverState *source = NULL;
3070 BdrvDirtyBitmap *bmap = NULL;
3071 AioContext *aio_context;
3072 QDict *options = NULL;
3073 Error *local_err = NULL;
3074 int flags;
3075 int64_t size;
3076 int ret;
3077
3078 if (!has_speed) {
3079 speed = 0;
3080 }
3081 if (!has_on_source_error) {
3082 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3083 }
3084 if (!has_on_target_error) {
3085 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3086 }
3087 if (!has_mode) {
3088 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3089 }
3090
3091 blk = blk_by_name(device);
3092 if (!blk) {
3093 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3094 "Device '%s' not found", device);
3095 return;
3096 }
3097
3098 aio_context = blk_get_aio_context(blk);
3099 aio_context_acquire(aio_context);
3100
3101 /* Although backup_run has this check too, we need to use bs->drv below, so
3102 * do an early check redundantly. */
3103 if (!blk_is_available(blk)) {
3104 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3105 goto out;
3106 }
3107 bs = blk_bs(blk);
3108
3109 if (!has_format) {
3110 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3111 }
3112
3113 /* Early check to avoid creating target */
3114 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3115 goto out;
3116 }
3117
3118 flags = bs->open_flags | BDRV_O_RDWR;
3119
3120 /* See if we have a backing HD we can use to create our new image
3121 * on top of. */
3122 if (sync == MIRROR_SYNC_MODE_TOP) {
3123 source = backing_bs(bs);
3124 if (!source) {
3125 sync = MIRROR_SYNC_MODE_FULL;
3126 }
3127 }
3128 if (sync == MIRROR_SYNC_MODE_NONE) {
3129 source = bs;
3130 }
3131
3132 size = bdrv_getlength(bs);
3133 if (size < 0) {
3134 error_setg_errno(errp, -size, "bdrv_getlength failed");
3135 goto out;
3136 }
3137
3138 if (mode != NEW_IMAGE_MODE_EXISTING) {
3139 assert(format);
3140 if (source) {
3141 bdrv_img_create(target, format, source->filename,
3142 source->drv->format_name, NULL,
3143 size, flags, &local_err, false);
3144 } else {
3145 bdrv_img_create(target, format, NULL, NULL, NULL,
3146 size, flags, &local_err, false);
3147 }
3148 }
3149
3150 if (local_err) {
3151 error_propagate(errp, local_err);
3152 goto out;
3153 }
3154
3155 if (format) {
3156 options = qdict_new();
3157 qdict_put(options, "driver", qstring_from_str(format));
3158 }
3159
3160 target_bs = NULL;
3161 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
3162 if (ret < 0) {
3163 error_propagate(errp, local_err);
3164 goto out;
3165 }
3166
3167 bdrv_set_aio_context(target_bs, aio_context);
3168
3169 if (has_bitmap) {
3170 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
3171 if (!bmap) {
3172 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
3173 bdrv_unref(target_bs);
3174 goto out;
3175 }
3176 }
3177
3178 backup_start(bs, target_bs, speed, sync, bmap,
3179 on_source_error, on_target_error,
3180 block_job_cb, bs, txn, &local_err);
3181 if (local_err != NULL) {
3182 bdrv_unref(target_bs);
3183 error_propagate(errp, local_err);
3184 goto out;
3185 }
3186
3187 out:
3188 aio_context_release(aio_context);
3189 }
3190
3191 void qmp_drive_backup(const char *device, const char *target,
3192 bool has_format, const char *format,
3193 enum MirrorSyncMode sync,
3194 bool has_mode, enum NewImageMode mode,
3195 bool has_speed, int64_t speed,
3196 bool has_bitmap, const char *bitmap,
3197 bool has_on_source_error, BlockdevOnError on_source_error,
3198 bool has_on_target_error, BlockdevOnError on_target_error,
3199 Error **errp)
3200 {
3201 return do_drive_backup(device, target, has_format, format, sync,
3202 has_mode, mode, has_speed, speed,
3203 has_bitmap, bitmap,
3204 has_on_source_error, on_source_error,
3205 has_on_target_error, on_target_error,
3206 NULL, errp);
3207 }
3208
3209 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3210 {
3211 return bdrv_named_nodes_list(errp);
3212 }
3213
3214 void do_blockdev_backup(const char *device, const char *target,
3215 enum MirrorSyncMode sync,
3216 bool has_speed, int64_t speed,
3217 bool has_on_source_error,
3218 BlockdevOnError on_source_error,
3219 bool has_on_target_error,
3220 BlockdevOnError on_target_error,
3221 BlockJobTxn *txn, Error **errp)
3222 {
3223 BlockBackend *blk, *target_blk;
3224 BlockDriverState *bs;
3225 BlockDriverState *target_bs;
3226 Error *local_err = NULL;
3227 AioContext *aio_context;
3228
3229 if (!has_speed) {
3230 speed = 0;
3231 }
3232 if (!has_on_source_error) {
3233 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3234 }
3235 if (!has_on_target_error) {
3236 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3237 }
3238
3239 blk = blk_by_name(device);
3240 if (!blk) {
3241 error_setg(errp, "Device '%s' not found", device);
3242 return;
3243 }
3244
3245 aio_context = blk_get_aio_context(blk);
3246 aio_context_acquire(aio_context);
3247
3248 if (!blk_is_available(blk)) {
3249 error_setg(errp, "Device '%s' has no medium", device);
3250 goto out;
3251 }
3252 bs = blk_bs(blk);
3253
3254 target_blk = blk_by_name(target);
3255 if (!target_blk) {
3256 error_setg(errp, "Device '%s' not found", target);
3257 goto out;
3258 }
3259
3260 if (!blk_is_available(target_blk)) {
3261 error_setg(errp, "Device '%s' has no medium", target);
3262 goto out;
3263 }
3264 target_bs = blk_bs(target_blk);
3265
3266 bdrv_ref(target_bs);
3267 bdrv_set_aio_context(target_bs, aio_context);
3268 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
3269 on_target_error, block_job_cb, bs, txn, &local_err);
3270 if (local_err != NULL) {
3271 bdrv_unref(target_bs);
3272 error_propagate(errp, local_err);
3273 }
3274 out:
3275 aio_context_release(aio_context);
3276 }
3277
3278 void qmp_blockdev_backup(const char *device, const char *target,
3279 enum MirrorSyncMode sync,
3280 bool has_speed, int64_t speed,
3281 bool has_on_source_error,
3282 BlockdevOnError on_source_error,
3283 bool has_on_target_error,
3284 BlockdevOnError on_target_error,
3285 Error **errp)
3286 {
3287 do_blockdev_backup(device, target, sync, has_speed, speed,
3288 has_on_source_error, on_source_error,
3289 has_on_target_error, on_target_error,
3290 NULL, errp);
3291 }
3292
3293 /* Parameter check and block job starting for drive mirroring.
3294 * Caller should hold @device and @target's aio context (must be the same).
3295 **/
3296 static void blockdev_mirror_common(BlockDriverState *bs,
3297 BlockDriverState *target,
3298 bool has_replaces, const char *replaces,
3299 enum MirrorSyncMode sync,
3300 bool has_speed, int64_t speed,
3301 bool has_granularity, uint32_t granularity,
3302 bool has_buf_size, int64_t buf_size,
3303 bool has_on_source_error,
3304 BlockdevOnError on_source_error,
3305 bool has_on_target_error,
3306 BlockdevOnError on_target_error,
3307 bool has_unmap, bool unmap,
3308 Error **errp)
3309 {
3310
3311 if (!has_speed) {
3312 speed = 0;
3313 }
3314 if (!has_on_source_error) {
3315 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3316 }
3317 if (!has_on_target_error) {
3318 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3319 }
3320 if (!has_granularity) {
3321 granularity = 0;
3322 }
3323 if (!has_buf_size) {
3324 buf_size = 0;
3325 }
3326 if (!has_unmap) {
3327 unmap = true;
3328 }
3329
3330 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3331 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3332 "a value in range [512B, 64MB]");
3333 return;
3334 }
3335 if (granularity & (granularity - 1)) {
3336 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3337 "power of 2");
3338 return;
3339 }
3340
3341 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3342 return;
3343 }
3344 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3345 return;
3346 }
3347 if (target->blk) {
3348 error_setg(errp, "Cannot mirror to an attached block device");
3349 return;
3350 }
3351
3352 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3353 sync = MIRROR_SYNC_MODE_FULL;
3354 }
3355
3356 /* pass the node name to replace to mirror start since it's loose coupling
3357 * and will allow to check whether the node still exist at mirror completion
3358 */
3359 mirror_start(bs, target,
3360 has_replaces ? replaces : NULL,
3361 speed, granularity, buf_size, sync,
3362 on_source_error, on_target_error, unmap,
3363 block_job_cb, bs, errp);
3364 }
3365
3366 void qmp_drive_mirror(const char *device, const char *target,
3367 bool has_format, const char *format,
3368 bool has_node_name, const char *node_name,
3369 bool has_replaces, const char *replaces,
3370 enum MirrorSyncMode sync,
3371 bool has_mode, enum NewImageMode mode,
3372 bool has_speed, int64_t speed,
3373 bool has_granularity, uint32_t granularity,
3374 bool has_buf_size, int64_t buf_size,
3375 bool has_on_source_error, BlockdevOnError on_source_error,
3376 bool has_on_target_error, BlockdevOnError on_target_error,
3377 bool has_unmap, bool unmap,
3378 Error **errp)
3379 {
3380 BlockDriverState *bs;
3381 BlockBackend *blk;
3382 BlockDriverState *source, *target_bs;
3383 AioContext *aio_context;
3384 Error *local_err = NULL;
3385 QDict *options = NULL;
3386 int flags;
3387 int64_t size;
3388 int ret;
3389
3390 blk = blk_by_name(device);
3391 if (!blk) {
3392 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3393 "Device '%s' not found", device);
3394 return;
3395 }
3396
3397 aio_context = blk_get_aio_context(blk);
3398 aio_context_acquire(aio_context);
3399
3400 if (!blk_is_available(blk)) {
3401 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3402 goto out;
3403 }
3404 bs = blk_bs(blk);
3405 if (!has_mode) {
3406 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3407 }
3408
3409 if (!has_format) {
3410 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3411 }
3412
3413 flags = bs->open_flags | BDRV_O_RDWR;
3414 source = backing_bs(bs);
3415 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3416 sync = MIRROR_SYNC_MODE_FULL;
3417 }
3418 if (sync == MIRROR_SYNC_MODE_NONE) {
3419 source = bs;
3420 }
3421
3422 size = bdrv_getlength(bs);
3423 if (size < 0) {
3424 error_setg_errno(errp, -size, "bdrv_getlength failed");
3425 goto out;
3426 }
3427
3428 if (has_replaces) {
3429 BlockDriverState *to_replace_bs;
3430 AioContext *replace_aio_context;
3431 int64_t replace_size;
3432
3433 if (!has_node_name) {
3434 error_setg(errp, "a node-name must be provided when replacing a"
3435 " named node of the graph");
3436 goto out;
3437 }
3438
3439 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3440
3441 if (!to_replace_bs) {
3442 error_propagate(errp, local_err);
3443 goto out;
3444 }
3445
3446 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3447 aio_context_acquire(replace_aio_context);
3448 replace_size = bdrv_getlength(to_replace_bs);
3449 aio_context_release(replace_aio_context);
3450
3451 if (size != replace_size) {
3452 error_setg(errp, "cannot replace image with a mirror image of "
3453 "different size");
3454 goto out;
3455 }
3456 }
3457
3458 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3459 && mode != NEW_IMAGE_MODE_EXISTING)
3460 {
3461 /* create new image w/o backing file */
3462 assert(format);
3463 bdrv_img_create(target, format,
3464 NULL, NULL, NULL, size, flags, &local_err, false);
3465 } else {
3466 switch (mode) {
3467 case NEW_IMAGE_MODE_EXISTING:
3468 break;
3469 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3470 /* create new image with backing file */
3471 bdrv_img_create(target, format,
3472 source->filename,
3473 source->drv->format_name,
3474 NULL, size, flags, &local_err, false);
3475 break;
3476 default:
3477 abort();
3478 }
3479 }
3480
3481 if (local_err) {
3482 error_propagate(errp, local_err);
3483 goto out;
3484 }
3485
3486 options = qdict_new();
3487 if (has_node_name) {
3488 qdict_put(options, "node-name", qstring_from_str(node_name));
3489 }
3490 if (format) {
3491 qdict_put(options, "driver", qstring_from_str(format));
3492 }
3493
3494 /* Mirroring takes care of copy-on-write using the source's backing
3495 * file.
3496 */
3497 target_bs = NULL;
3498 ret = bdrv_open(&target_bs, target, NULL, options,
3499 flags | BDRV_O_NO_BACKING, &local_err);
3500 if (ret < 0) {
3501 error_propagate(errp, local_err);
3502 goto out;
3503 }
3504
3505 bdrv_set_aio_context(target_bs, aio_context);
3506
3507 blockdev_mirror_common(bs, target_bs,
3508 has_replaces, replaces, sync,
3509 has_speed, speed,
3510 has_granularity, granularity,
3511 has_buf_size, buf_size,
3512 has_on_source_error, on_source_error,
3513 has_on_target_error, on_target_error,
3514 has_unmap, unmap,
3515 &local_err);
3516 if (local_err) {
3517 error_propagate(errp, local_err);
3518 bdrv_unref(target_bs);
3519 }
3520 out:
3521 aio_context_release(aio_context);
3522 }
3523
3524 void qmp_blockdev_mirror(const char *device, const char *target,
3525 bool has_replaces, const char *replaces,
3526 MirrorSyncMode sync,
3527 bool has_speed, int64_t speed,
3528 bool has_granularity, uint32_t granularity,
3529 bool has_buf_size, int64_t buf_size,
3530 bool has_on_source_error,
3531 BlockdevOnError on_source_error,
3532 bool has_on_target_error,
3533 BlockdevOnError on_target_error,
3534 Error **errp)
3535 {
3536 BlockDriverState *bs;
3537 BlockBackend *blk;
3538 BlockDriverState *target_bs;
3539 AioContext *aio_context;
3540 Error *local_err = NULL;
3541
3542 blk = blk_by_name(device);
3543 if (!blk) {
3544 error_setg(errp, "Device '%s' not found", device);
3545 return;
3546 }
3547 bs = blk_bs(blk);
3548
3549 if (!bs) {
3550 error_setg(errp, "Device '%s' has no media", device);
3551 return;
3552 }
3553
3554 target_bs = bdrv_lookup_bs(target, target, errp);
3555 if (!target_bs) {
3556 return;
3557 }
3558
3559 aio_context = bdrv_get_aio_context(bs);
3560 aio_context_acquire(aio_context);
3561
3562 bdrv_ref(target_bs);
3563 bdrv_set_aio_context(target_bs, aio_context);
3564
3565 blockdev_mirror_common(bs, target_bs,
3566 has_replaces, replaces, sync,
3567 has_speed, speed,
3568 has_granularity, granularity,
3569 has_buf_size, buf_size,
3570 has_on_source_error, on_source_error,
3571 has_on_target_error, on_target_error,
3572 true, true,
3573 &local_err);
3574 if (local_err) {
3575 error_propagate(errp, local_err);
3576 bdrv_unref(target_bs);
3577 }
3578
3579 aio_context_release(aio_context);
3580 }
3581
3582 /* Get the block job for a given device name and acquire its AioContext */
3583 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3584 Error **errp)
3585 {
3586 BlockBackend *blk;
3587 BlockDriverState *bs;
3588
3589 *aio_context = NULL;
3590
3591 blk = blk_by_name(device);
3592 if (!blk) {
3593 goto notfound;
3594 }
3595
3596 *aio_context = blk_get_aio_context(blk);
3597 aio_context_acquire(*aio_context);
3598
3599 if (!blk_is_available(blk)) {
3600 goto notfound;
3601 }
3602 bs = blk_bs(blk);
3603
3604 if (!bs->job) {
3605 goto notfound;
3606 }
3607
3608 return bs->job;
3609
3610 notfound:
3611 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3612 "No active block job on device '%s'", device);
3613 if (*aio_context) {
3614 aio_context_release(*aio_context);
3615 *aio_context = NULL;
3616 }
3617 return NULL;
3618 }
3619
3620 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3621 {
3622 AioContext *aio_context;
3623 BlockJob *job = find_block_job(device, &aio_context, errp);
3624
3625 if (!job) {
3626 return;
3627 }
3628
3629 block_job_set_speed(job, speed, errp);
3630 aio_context_release(aio_context);
3631 }
3632
3633 void qmp_block_job_cancel(const char *device,
3634 bool has_force, bool force, Error **errp)
3635 {
3636 AioContext *aio_context;
3637 BlockJob *job = find_block_job(device, &aio_context, errp);
3638
3639 if (!job) {
3640 return;
3641 }
3642
3643 if (!has_force) {
3644 force = false;
3645 }
3646
3647 if (job->user_paused && !force) {
3648 error_setg(errp, "The block job for device '%s' is currently paused",
3649 device);
3650 goto out;
3651 }
3652
3653 trace_qmp_block_job_cancel(job);
3654 block_job_cancel(job);
3655 out:
3656 aio_context_release(aio_context);
3657 }
3658
3659 void qmp_block_job_pause(const char *device, Error **errp)
3660 {
3661 AioContext *aio_context;
3662 BlockJob *job = find_block_job(device, &aio_context, errp);
3663
3664 if (!job || job->user_paused) {
3665 return;
3666 }
3667
3668 job->user_paused = true;
3669 trace_qmp_block_job_pause(job);
3670 block_job_pause(job);
3671 aio_context_release(aio_context);
3672 }
3673
3674 void qmp_block_job_resume(const char *device, Error **errp)
3675 {
3676 AioContext *aio_context;
3677 BlockJob *job = find_block_job(device, &aio_context, errp);
3678
3679 if (!job || !job->user_paused) {
3680 return;
3681 }
3682
3683 job->user_paused = false;
3684 trace_qmp_block_job_resume(job);
3685 block_job_resume(job);
3686 aio_context_release(aio_context);
3687 }
3688
3689 void qmp_block_job_complete(const char *device, Error **errp)
3690 {
3691 AioContext *aio_context;
3692 BlockJob *job = find_block_job(device, &aio_context, errp);
3693
3694 if (!job) {
3695 return;
3696 }
3697
3698 trace_qmp_block_job_complete(job);
3699 block_job_complete(job, errp);
3700 aio_context_release(aio_context);
3701 }
3702
3703 void qmp_change_backing_file(const char *device,
3704 const char *image_node_name,
3705 const char *backing_file,
3706 Error **errp)
3707 {
3708 BlockBackend *blk;
3709 BlockDriverState *bs = NULL;
3710 AioContext *aio_context;
3711 BlockDriverState *image_bs = NULL;
3712 Error *local_err = NULL;
3713 bool ro;
3714 int open_flags;
3715 int ret;
3716
3717 blk = blk_by_name(device);
3718 if (!blk) {
3719 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3720 "Device '%s' not found", device);
3721 return;
3722 }
3723
3724 aio_context = blk_get_aio_context(blk);
3725 aio_context_acquire(aio_context);
3726
3727 if (!blk_is_available(blk)) {
3728 error_setg(errp, "Device '%s' has no medium", device);
3729 goto out;
3730 }
3731 bs = blk_bs(blk);
3732
3733 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3734 if (local_err) {
3735 error_propagate(errp, local_err);
3736 goto out;
3737 }
3738
3739 if (!image_bs) {
3740 error_setg(errp, "image file not found");
3741 goto out;
3742 }
3743
3744 if (bdrv_find_base(image_bs) == image_bs) {
3745 error_setg(errp, "not allowing backing file change on an image "
3746 "without a backing file");
3747 goto out;
3748 }
3749
3750 /* even though we are not necessarily operating on bs, we need it to
3751 * determine if block ops are currently prohibited on the chain */
3752 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3753 goto out;
3754 }
3755
3756 /* final sanity check */
3757 if (!bdrv_chain_contains(bs, image_bs)) {
3758 error_setg(errp, "'%s' and image file are not in the same chain",
3759 device);
3760 goto out;
3761 }
3762
3763 /* if not r/w, reopen to make r/w */
3764 open_flags = image_bs->open_flags;
3765 ro = bdrv_is_read_only(image_bs);
3766
3767 if (ro) {
3768 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3769 if (local_err) {
3770 error_propagate(errp, local_err);
3771 goto out;
3772 }
3773 }
3774
3775 ret = bdrv_change_backing_file(image_bs, backing_file,
3776 image_bs->drv ? image_bs->drv->format_name : "");
3777
3778 if (ret < 0) {
3779 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3780 backing_file);
3781 /* don't exit here, so we can try to restore open flags if
3782 * appropriate */
3783 }
3784
3785 if (ro) {
3786 bdrv_reopen(image_bs, open_flags, &local_err);
3787 if (local_err) {
3788 error_propagate(errp, local_err); /* will preserve prior errp */
3789 }
3790 }
3791
3792 out:
3793 aio_context_release(aio_context);
3794 }
3795
3796 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3797 {
3798 QmpOutputVisitor *ov = qmp_output_visitor_new();
3799 BlockDriverState *bs;
3800 BlockBackend *blk = NULL;
3801 QObject *obj;
3802 QDict *qdict;
3803 Error *local_err = NULL;
3804
3805 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3806 * cache.direct=false instead of silently switching to aio=threads, except
3807 * when called from drive_new().
3808 *
3809 * For now, simply forbidding the combination for all drivers will do. */
3810 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3811 bool direct = options->has_cache &&
3812 options->cache->has_direct &&
3813 options->cache->direct;
3814 if (!direct) {
3815 error_setg(errp, "aio=native requires cache.direct=true");
3816 goto fail;
3817 }
3818 }
3819
3820 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3821 &options, NULL, &local_err);
3822 if (local_err) {
3823 error_propagate(errp, local_err);
3824 goto fail;
3825 }
3826
3827 obj = qmp_output_get_qobject(ov);
3828 qdict = qobject_to_qdict(obj);
3829
3830 qdict_flatten(qdict);
3831
3832 if (options->has_id) {
3833 blk = blockdev_init(NULL, qdict, &local_err);
3834 if (local_err) {
3835 error_propagate(errp, local_err);
3836 goto fail;
3837 }
3838
3839 bs = blk_bs(blk);
3840 } else {
3841 if (!qdict_get_try_str(qdict, "node-name")) {
3842 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3843 "the root node");
3844 goto fail;
3845 }
3846
3847 bs = bds_tree_init(qdict, errp);
3848 if (!bs) {
3849 goto fail;
3850 }
3851 }
3852
3853 if (bs && bdrv_key_required(bs)) {
3854 if (blk) {
3855 blk_unref(blk);
3856 } else {
3857 bdrv_unref(bs);
3858 }
3859 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3860 goto fail;
3861 }
3862
3863 fail:
3864 qmp_output_visitor_cleanup(ov);
3865 }
3866
3867 void qmp_x_blockdev_del(bool has_id, const char *id,
3868 bool has_node_name, const char *node_name, Error **errp)
3869 {
3870 AioContext *aio_context;
3871 BlockBackend *blk;
3872 BlockDriverState *bs;
3873
3874 if (has_id && has_node_name) {
3875 error_setg(errp, "Only one of id and node-name must be specified");
3876 return;
3877 } else if (!has_id && !has_node_name) {
3878 error_setg(errp, "No block device specified");
3879 return;
3880 }
3881
3882 if (has_id) {
3883 blk = blk_by_name(id);
3884 if (!blk) {
3885 error_setg(errp, "Cannot find block backend %s", id);
3886 return;
3887 }
3888 if (blk_get_refcnt(blk) > 1) {
3889 error_setg(errp, "Block backend %s is in use", id);
3890 return;
3891 }
3892 bs = blk_bs(blk);
3893 aio_context = blk_get_aio_context(blk);
3894 } else {
3895 bs = bdrv_find_node(node_name);
3896 if (!bs) {
3897 error_setg(errp, "Cannot find node %s", node_name);
3898 return;
3899 }
3900 blk = bs->blk;
3901 if (blk) {
3902 error_setg(errp, "Node %s is in use by %s",
3903 node_name, blk_name(blk));
3904 return;
3905 }
3906 aio_context = bdrv_get_aio_context(bs);
3907 }
3908
3909 aio_context_acquire(aio_context);
3910
3911 if (bs) {
3912 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3913 goto out;
3914 }
3915
3916 if (bs->refcnt > 1 || !QLIST_EMPTY(&bs->parents)) {
3917 error_setg(errp, "Block device %s is in use",
3918 bdrv_get_device_or_node_name(bs));
3919 goto out;
3920 }
3921 }
3922
3923 if (blk) {
3924 blk_unref(blk);
3925 } else {
3926 bdrv_unref(bs);
3927 }
3928
3929 out:
3930 aio_context_release(aio_context);
3931 }
3932
3933 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3934 {
3935 BlockJobInfoList *head = NULL, **p_next = &head;
3936 BlockDriverState *bs;
3937
3938 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3939 AioContext *aio_context = bdrv_get_aio_context(bs);
3940
3941 aio_context_acquire(aio_context);
3942
3943 if (bs->job) {
3944 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3945 elem->value = block_job_query(bs->job);
3946 *p_next = elem;
3947 p_next = &elem->next;
3948 }
3949
3950 aio_context_release(aio_context);
3951 }
3952
3953 return head;
3954 }
3955
3956 QemuOptsList qemu_common_drive_opts = {
3957 .name = "drive",
3958 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3959 .desc = {
3960 {
3961 .name = "snapshot",
3962 .type = QEMU_OPT_BOOL,
3963 .help = "enable/disable snapshot mode",
3964 },{
3965 .name = "discard",
3966 .type = QEMU_OPT_STRING,
3967 .help = "discard operation (ignore/off, unmap/on)",
3968 },{
3969 .name = "aio",
3970 .type = QEMU_OPT_STRING,
3971 .help = "host AIO implementation (threads, native)",
3972 },{
3973 .name = "format",
3974 .type = QEMU_OPT_STRING,
3975 .help = "disk format (raw, qcow2, ...)",
3976 },{
3977 .name = "rerror",
3978 .type = QEMU_OPT_STRING,
3979 .help = "read error action",
3980 },{
3981 .name = "werror",
3982 .type = QEMU_OPT_STRING,
3983 .help = "write error action",
3984 },{
3985 .name = "read-only",
3986 .type = QEMU_OPT_BOOL,
3987 .help = "open drive file as read-only",
3988 },{
3989 .name = "throttling.iops-total",
3990 .type = QEMU_OPT_NUMBER,
3991 .help = "limit total I/O operations per second",
3992 },{
3993 .name = "throttling.iops-read",
3994 .type = QEMU_OPT_NUMBER,
3995 .help = "limit read operations per second",
3996 },{
3997 .name = "throttling.iops-write",
3998 .type = QEMU_OPT_NUMBER,
3999 .help = "limit write operations per second",
4000 },{
4001 .name = "throttling.bps-total",
4002 .type = QEMU_OPT_NUMBER,
4003 .help = "limit total bytes per second",
4004 },{
4005 .name = "throttling.bps-read",
4006 .type = QEMU_OPT_NUMBER,
4007 .help = "limit read bytes per second",
4008 },{
4009 .name = "throttling.bps-write",
4010 .type = QEMU_OPT_NUMBER,
4011 .help = "limit write bytes per second",
4012 },{
4013 .name = "throttling.iops-total-max",
4014 .type = QEMU_OPT_NUMBER,
4015 .help = "I/O operations burst",
4016 },{
4017 .name = "throttling.iops-read-max",
4018 .type = QEMU_OPT_NUMBER,
4019 .help = "I/O operations read burst",
4020 },{
4021 .name = "throttling.iops-write-max",
4022 .type = QEMU_OPT_NUMBER,
4023 .help = "I/O operations write burst",
4024 },{
4025 .name = "throttling.bps-total-max",
4026 .type = QEMU_OPT_NUMBER,
4027 .help = "total bytes burst",
4028 },{
4029 .name = "throttling.bps-read-max",
4030 .type = QEMU_OPT_NUMBER,
4031 .help = "total bytes read burst",
4032 },{
4033 .name = "throttling.bps-write-max",
4034 .type = QEMU_OPT_NUMBER,
4035 .help = "total bytes write burst",
4036 },{
4037 .name = "throttling.iops-size",
4038 .type = QEMU_OPT_NUMBER,
4039 .help = "when limiting by iops max size of an I/O in bytes",
4040 },{
4041 .name = "throttling.group",
4042 .type = QEMU_OPT_STRING,
4043 .help = "name of the block throttling group",
4044 },{
4045 .name = "copy-on-read",
4046 .type = QEMU_OPT_BOOL,
4047 .help = "copy read data from backing file into image file",
4048 },{
4049 .name = "detect-zeroes",
4050 .type = QEMU_OPT_STRING,
4051 .help = "try to optimize zero writes (off, on, unmap)",
4052 },{
4053 .name = "stats-account-invalid",
4054 .type = QEMU_OPT_BOOL,
4055 .help = "whether to account for invalid I/O operations "
4056 "in the statistics",
4057 },{
4058 .name = "stats-account-failed",
4059 .type = QEMU_OPT_BOOL,
4060 .help = "whether to account for failed I/O operations "
4061 "in the statistics",
4062 },
4063 { /* end of list */ }
4064 },
4065 };
4066
4067 static QemuOptsList qemu_root_bds_opts = {
4068 .name = "root-bds",
4069 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4070 .desc = {
4071 {
4072 .name = "discard",
4073 .type = QEMU_OPT_STRING,
4074 .help = "discard operation (ignore/off, unmap/on)",
4075 },{
4076 .name = "aio",
4077 .type = QEMU_OPT_STRING,
4078 .help = "host AIO implementation (threads, native)",
4079 },{
4080 .name = "read-only",
4081 .type = QEMU_OPT_BOOL,
4082 .help = "open drive file as read-only",
4083 },{
4084 .name = "copy-on-read",
4085 .type = QEMU_OPT_BOOL,
4086 .help = "copy read data from backing file into image file",
4087 },{
4088 .name = "detect-zeroes",
4089 .type = QEMU_OPT_STRING,
4090 .help = "try to optimize zero writes (off, on, unmap)",
4091 },
4092 { /* end of list */ }
4093 },
4094 };
4095
4096 QemuOptsList qemu_drive_opts = {
4097 .name = "drive",
4098 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4099 .desc = {
4100 /*
4101 * no elements => accept any params
4102 * validation will happen later
4103 */
4104 { /* end of list */ }
4105 },
4106 };
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