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net: always walk through filters in reverse if traffic is egress
[qemu.git] / blockdev.c
blobbe4ca44ab2463fc96089e6afdaf619e23bf7852a
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 QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
54 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
55
56 static const char *const if_name[IF_COUNT] = {
57 [IF_NONE] = "none",
58 [IF_IDE] = "ide",
59 [IF_SCSI] = "scsi",
60 [IF_FLOPPY] = "floppy",
61 [IF_PFLASH] = "pflash",
62 [IF_MTD] = "mtd",
63 [IF_SD] = "sd",
64 [IF_VIRTIO] = "virtio",
65 [IF_XEN] = "xen",
66 };
67
68 static int if_max_devs[IF_COUNT] = {
69 /*
70 * Do not change these numbers! They govern how drive option
71 * index maps to unit and bus. That mapping is ABI.
72 *
73 * All controllers used to imlement if=T drives need to support
74 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
75 * Otherwise, some index values map to "impossible" bus, unit
76 * values.
77 *
78 * For instance, if you change [IF_SCSI] to 255, -drive
79 * if=scsi,index=12 no longer means bus=1,unit=5, but
80 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
81 * the drive can't be set up. Regression.
82 */
83 [IF_IDE] = 2,
84 [IF_SCSI] = 7,
85 };
86
87 /**
88 * Boards may call this to offer board-by-board overrides
89 * of the default, global values.
90 */
91 void override_max_devs(BlockInterfaceType type, int max_devs)
92 {
93 BlockBackend *blk;
94 DriveInfo *dinfo;
95
96 if (max_devs <= 0) {
97 return;
98 }
99
100 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
101 dinfo = blk_legacy_dinfo(blk);
102 if (dinfo->type == type) {
103 fprintf(stderr, "Cannot override units-per-bus property of"
104 " the %s interface, because a drive of that type has"
105 " already been added.\n", if_name[type]);
106 g_assert_not_reached();
107 }
108 }
109
110 if_max_devs[type] = max_devs;
111 }
112
113 /*
114 * We automatically delete the drive when a device using it gets
115 * unplugged. Questionable feature, but we can't just drop it.
116 * Device models call blockdev_mark_auto_del() to schedule the
117 * automatic deletion, and generic qdev code calls blockdev_auto_del()
118 * when deletion is actually safe.
119 */
120 void blockdev_mark_auto_del(BlockBackend *blk)
121 {
122 DriveInfo *dinfo = blk_legacy_dinfo(blk);
123 BlockDriverState *bs = blk_bs(blk);
124 AioContext *aio_context;
125
126 if (!dinfo) {
127 return;
128 }
129
130 if (bs) {
131 aio_context = bdrv_get_aio_context(bs);
132 aio_context_acquire(aio_context);
133
134 if (bs->job) {
135 block_job_cancel(bs->job);
136 }
137
138 aio_context_release(aio_context);
139 }
140
141 dinfo->auto_del = 1;
142 }
143
144 void blockdev_auto_del(BlockBackend *blk)
145 {
146 DriveInfo *dinfo = blk_legacy_dinfo(blk);
147
148 if (dinfo && dinfo->auto_del) {
149 blk_unref(blk);
150 }
151 }
152
153 /**
154 * Returns the current mapping of how many units per bus
155 * a particular interface can support.
156 *
157 * A positive integer indicates n units per bus.
158 * 0 implies the mapping has not been established.
159 * -1 indicates an invalid BlockInterfaceType was given.
160 */
161 int drive_get_max_devs(BlockInterfaceType type)
162 {
163 if (type >= IF_IDE && type < IF_COUNT) {
164 return if_max_devs[type];
165 }
166
167 return -1;
168 }
169
170 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
171 {
172 int max_devs = if_max_devs[type];
173 return max_devs ? index / max_devs : 0;
174 }
175
176 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
177 {
178 int max_devs = if_max_devs[type];
179 return max_devs ? index % max_devs : index;
180 }
181
182 QemuOpts *drive_def(const char *optstr)
183 {
184 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
185 }
186
187 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
188 const char *optstr)
189 {
190 QemuOpts *opts;
191
192 opts = drive_def(optstr);
193 if (!opts) {
194 return NULL;
195 }
196 if (type != IF_DEFAULT) {
197 qemu_opt_set(opts, "if", if_name[type], &error_abort);
198 }
199 if (index >= 0) {
200 qemu_opt_set_number(opts, "index", index, &error_abort);
201 }
202 if (file)
203 qemu_opt_set(opts, "file", file, &error_abort);
204 return opts;
205 }
206
207 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
208 {
209 BlockBackend *blk;
210 DriveInfo *dinfo;
211
212 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
213 dinfo = blk_legacy_dinfo(blk);
214 if (dinfo && dinfo->type == type
215 && dinfo->bus == bus && dinfo->unit == unit) {
216 return dinfo;
217 }
218 }
219
220 return NULL;
221 }
222
223 bool drive_check_orphaned(void)
224 {
225 BlockBackend *blk;
226 DriveInfo *dinfo;
227 bool rs = false;
228
229 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
230 dinfo = blk_legacy_dinfo(blk);
231 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
232 /* Unless this is a default drive, this may be an oversight. */
233 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
234 dinfo->type != IF_NONE) {
235 fprintf(stderr, "Warning: Orphaned drive without device: "
236 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
237 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
238 if_name[dinfo->type], dinfo->bus, dinfo->unit);
239 rs = true;
240 }
241 }
242
243 return rs;
244 }
245
246 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
247 {
248 return drive_get(type,
249 drive_index_to_bus_id(type, index),
250 drive_index_to_unit_id(type, index));
251 }
252
253 int drive_get_max_bus(BlockInterfaceType type)
254 {
255 int max_bus;
256 BlockBackend *blk;
257 DriveInfo *dinfo;
258
259 max_bus = -1;
260 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
261 dinfo = blk_legacy_dinfo(blk);
262 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
263 max_bus = dinfo->bus;
264 }
265 }
266 return max_bus;
267 }
268
269 /* Get a block device. This should only be used for single-drive devices
270 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
271 appropriate bus. */
272 DriveInfo *drive_get_next(BlockInterfaceType type)
273 {
274 static int next_block_unit[IF_COUNT];
275
276 return drive_get(type, 0, next_block_unit[type]++);
277 }
278
279 static void bdrv_format_print(void *opaque, const char *name)
280 {
281 error_printf(" %s", name);
282 }
283
284 typedef struct {
285 QEMUBH *bh;
286 BlockDriverState *bs;
287 } BDRVPutRefBH;
288
289 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
290 {
291 if (!strcmp(buf, "ignore")) {
292 return BLOCKDEV_ON_ERROR_IGNORE;
293 } else if (!is_read && !strcmp(buf, "enospc")) {
294 return BLOCKDEV_ON_ERROR_ENOSPC;
295 } else if (!strcmp(buf, "stop")) {
296 return BLOCKDEV_ON_ERROR_STOP;
297 } else if (!strcmp(buf, "report")) {
298 return BLOCKDEV_ON_ERROR_REPORT;
299 } else {
300 error_setg(errp, "'%s' invalid %s error action",
301 buf, is_read ? "read" : "write");
302 return -1;
303 }
304 }
305
306 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
307 Error **errp)
308 {
309 const QListEntry *entry;
310 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
311 switch (qobject_type(entry->value)) {
312
313 case QTYPE_QSTRING: {
314 unsigned long long length;
315 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
316 if (parse_uint_full(str, &length, 10) == 0 &&
317 length > 0 && length <= UINT_MAX) {
318 block_acct_add_interval(stats, (unsigned) length);
319 } else {
320 error_setg(errp, "Invalid interval length: %s", str);
321 return false;
322 }
323 break;
324 }
325
326 case QTYPE_QINT: {
327 int64_t length = qint_get_int(qobject_to_qint(entry->value));
328 if (length > 0 && length <= UINT_MAX) {
329 block_acct_add_interval(stats, (unsigned) length);
330 } else {
331 error_setg(errp, "Invalid interval length: %" PRId64, length);
332 return false;
333 }
334 break;
335 }
336
337 default:
338 error_setg(errp, "The specification of stats-intervals is invalid");
339 return false;
340 }
341 }
342 return true;
343 }
344
345 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
346 {
347 if (throttle_conflicting(cfg)) {
348 error_setg(errp, "bps/iops/max total values and read/write values"
349 " cannot be used at the same time");
350 return false;
351 }
352
353 if (!throttle_is_valid(cfg)) {
354 error_setg(errp, "bps/iops/max values must be within [0, %lld]",
355 THROTTLE_VALUE_MAX);
356 return false;
357 }
358
359 if (throttle_max_is_missing_limit(cfg)) {
360 error_setg(errp, "bps_max/iops_max require corresponding"
361 " bps/iops values");
362 return false;
363 }
364
365 return true;
366 }
367
368 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
369
370 /* All parameters but @opts are optional and may be set to NULL. */
371 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
372 const char **throttling_group, ThrottleConfig *throttle_cfg,
373 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
374 {
375 const char *discard;
376 Error *local_error = NULL;
377 const char *aio;
378
379 if (bdrv_flags) {
380 if (!qemu_opt_get_bool(opts, "read-only", false)) {
381 *bdrv_flags |= BDRV_O_RDWR;
382 }
383 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
384 *bdrv_flags |= BDRV_O_COPY_ON_READ;
385 }
386
387 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
388 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
389 error_setg(errp, "Invalid discard option");
390 return;
391 }
392 }
393
394 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
395 if (!strcmp(aio, "native")) {
396 *bdrv_flags |= BDRV_O_NATIVE_AIO;
397 } else if (!strcmp(aio, "threads")) {
398 /* this is the default */
399 } else {
400 error_setg(errp, "invalid aio option");
401 return;
402 }
403 }
404 }
405
406 /* disk I/O throttling */
407 if (throttling_group) {
408 *throttling_group = qemu_opt_get(opts, "throttling.group");
409 }
410
411 if (throttle_cfg) {
412 memset(throttle_cfg, 0, sizeof(*throttle_cfg));
413 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
414 qemu_opt_get_number(opts, "throttling.bps-total", 0);
415 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
416 qemu_opt_get_number(opts, "throttling.bps-read", 0);
417 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
418 qemu_opt_get_number(opts, "throttling.bps-write", 0);
419 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
420 qemu_opt_get_number(opts, "throttling.iops-total", 0);
421 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
422 qemu_opt_get_number(opts, "throttling.iops-read", 0);
423 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
424 qemu_opt_get_number(opts, "throttling.iops-write", 0);
425
426 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
427 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
428 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
429 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
430 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
431 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
432 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
433 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
434 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
435 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
436 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
437 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
438
439 throttle_cfg->op_size =
440 qemu_opt_get_number(opts, "throttling.iops-size", 0);
441
442 if (!check_throttle_config(throttle_cfg, errp)) {
443 return;
444 }
445 }
446
447 if (detect_zeroes) {
448 *detect_zeroes =
449 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
450 qemu_opt_get(opts, "detect-zeroes"),
451 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
452 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
453 &local_error);
454 if (local_error) {
455 error_propagate(errp, local_error);
456 return;
457 }
458
459 if (bdrv_flags &&
460 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
461 !(*bdrv_flags & BDRV_O_UNMAP))
462 {
463 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
464 "without setting discard operation to unmap");
465 return;
466 }
467 }
468 }
469
470 /* Takes the ownership of bs_opts */
471 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
472 Error **errp)
473 {
474 const char *buf;
475 int bdrv_flags = 0;
476 int on_read_error, on_write_error;
477 bool account_invalid, account_failed;
478 BlockBackend *blk;
479 BlockDriverState *bs;
480 ThrottleConfig cfg;
481 int snapshot = 0;
482 Error *error = NULL;
483 QemuOpts *opts;
484 QDict *interval_dict = NULL;
485 QList *interval_list = NULL;
486 const char *id;
487 BlockdevDetectZeroesOptions detect_zeroes =
488 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
489 const char *throttling_group = NULL;
490
491 /* Check common options by copying from bs_opts to opts, all other options
492 * stay in bs_opts for processing by bdrv_open(). */
493 id = qdict_get_try_str(bs_opts, "id");
494 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
495 if (error) {
496 error_propagate(errp, error);
497 goto err_no_opts;
498 }
499
500 qemu_opts_absorb_qdict(opts, bs_opts, &error);
501 if (error) {
502 error_propagate(errp, error);
503 goto early_err;
504 }
505
506 if (id) {
507 qdict_del(bs_opts, "id");
508 }
509
510 /* extract parameters */
511 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
512
513 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
514 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
515
516 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
517 qdict_array_split(interval_dict, &interval_list);
518
519 if (qdict_size(interval_dict) != 0) {
520 error_setg(errp, "Invalid option stats-intervals.%s",
521 qdict_first(interval_dict)->key);
522 goto early_err;
523 }
524
525 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
526 &detect_zeroes, &error);
527 if (error) {
528 error_propagate(errp, error);
529 goto early_err;
530 }
531
532 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
533 if (is_help_option(buf)) {
534 error_printf("Supported formats:");
535 bdrv_iterate_format(bdrv_format_print, NULL);
536 error_printf("\n");
537 goto early_err;
538 }
539
540 if (qdict_haskey(bs_opts, "driver")) {
541 error_setg(errp, "Cannot specify both 'driver' and 'format'");
542 goto early_err;
543 }
544 qdict_put(bs_opts, "driver", qstring_from_str(buf));
545 }
546
547 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
548 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
549 on_write_error = parse_block_error_action(buf, 0, &error);
550 if (error) {
551 error_propagate(errp, error);
552 goto early_err;
553 }
554 }
555
556 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
557 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
558 on_read_error = parse_block_error_action(buf, 1, &error);
559 if (error) {
560 error_propagate(errp, error);
561 goto early_err;
562 }
563 }
564
565 if (snapshot) {
566 bdrv_flags |= BDRV_O_SNAPSHOT;
567 }
568
569 /* init */
570 if ((!file || !*file) && !qdict_size(bs_opts)) {
571 BlockBackendRootState *blk_rs;
572
573 blk = blk_new(qemu_opts_id(opts), errp);
574 if (!blk) {
575 goto early_err;
576 }
577
578 blk_rs = blk_get_root_state(blk);
579 blk_rs->open_flags = bdrv_flags;
580 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
581 blk_rs->detect_zeroes = detect_zeroes;
582
583 if (throttle_enabled(&cfg)) {
584 if (!throttling_group) {
585 throttling_group = blk_name(blk);
586 }
587 blk_rs->throttle_group = g_strdup(throttling_group);
588 blk_rs->throttle_state = throttle_group_incref(throttling_group);
589 blk_rs->throttle_state->cfg = cfg;
590 }
591
592 QDECREF(bs_opts);
593 } else {
594 if (file && !*file) {
595 file = NULL;
596 }
597
598 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
599 * with other callers) rather than what we want as the real defaults.
600 * Apply the defaults here instead. */
601 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
602 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
603 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
604
605 if (snapshot) {
606 /* always use cache=unsafe with snapshot */
607 qdict_put(bs_opts, BDRV_OPT_CACHE_WB, qstring_from_str("on"));
608 qdict_put(bs_opts, BDRV_OPT_CACHE_DIRECT, qstring_from_str("off"));
609 qdict_put(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, qstring_from_str("on"));
610 }
611
612 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
613 errp);
614 if (!blk) {
615 goto err_no_bs_opts;
616 }
617 bs = blk_bs(blk);
618
619 bs->detect_zeroes = detect_zeroes;
620
621 /* disk I/O throttling */
622 if (throttle_enabled(&cfg)) {
623 if (!throttling_group) {
624 throttling_group = blk_name(blk);
625 }
626 bdrv_io_limits_enable(bs, throttling_group);
627 bdrv_set_io_limits(bs, &cfg);
628 }
629
630 if (bdrv_key_required(bs)) {
631 autostart = 0;
632 }
633
634 block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
635
636 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
637 blk_unref(blk);
638 blk = NULL;
639 goto err_no_bs_opts;
640 }
641 }
642
643 blk_set_on_error(blk, on_read_error, on_write_error);
644
645 err_no_bs_opts:
646 qemu_opts_del(opts);
647 QDECREF(interval_dict);
648 QDECREF(interval_list);
649 return blk;
650
651 early_err:
652 qemu_opts_del(opts);
653 QDECREF(interval_dict);
654 QDECREF(interval_list);
655 err_no_opts:
656 QDECREF(bs_opts);
657 return NULL;
658 }
659
660 static QemuOptsList qemu_root_bds_opts;
661
662 /* Takes the ownership of bs_opts */
663 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
664 {
665 BlockDriverState *bs;
666 QemuOpts *opts;
667 Error *local_error = NULL;
668 BlockdevDetectZeroesOptions detect_zeroes;
669 int ret;
670 int bdrv_flags = 0;
671
672 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
673 if (!opts) {
674 goto fail;
675 }
676
677 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
678 if (local_error) {
679 error_propagate(errp, local_error);
680 goto fail;
681 }
682
683 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
684 &detect_zeroes, &local_error);
685 if (local_error) {
686 error_propagate(errp, local_error);
687 goto fail;
688 }
689
690 bs = NULL;
691 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
692 if (ret < 0) {
693 goto fail_no_bs_opts;
694 }
695
696 bs->detect_zeroes = detect_zeroes;
697
698 fail_no_bs_opts:
699 qemu_opts_del(opts);
700 return bs;
701
702 fail:
703 qemu_opts_del(opts);
704 QDECREF(bs_opts);
705 return NULL;
706 }
707
708 void blockdev_close_all_bdrv_states(void)
709 {
710 BlockDriverState *bs, *next_bs;
711
712 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
713 AioContext *ctx = bdrv_get_aio_context(bs);
714
715 aio_context_acquire(ctx);
716 bdrv_unref(bs);
717 aio_context_release(ctx);
718 }
719 }
720
721 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
722 Error **errp)
723 {
724 const char *value;
725
726 value = qemu_opt_get(opts, from);
727 if (value) {
728 if (qemu_opt_find(opts, to)) {
729 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
730 "same time", to, from);
731 return;
732 }
733 }
734
735 /* rename all items in opts */
736 while ((value = qemu_opt_get(opts, from))) {
737 qemu_opt_set(opts, to, value, &error_abort);
738 qemu_opt_unset(opts, from);
739 }
740 }
741
742 QemuOptsList qemu_legacy_drive_opts = {
743 .name = "drive",
744 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
745 .desc = {
746 {
747 .name = "bus",
748 .type = QEMU_OPT_NUMBER,
749 .help = "bus number",
750 },{
751 .name = "unit",
752 .type = QEMU_OPT_NUMBER,
753 .help = "unit number (i.e. lun for scsi)",
754 },{
755 .name = "index",
756 .type = QEMU_OPT_NUMBER,
757 .help = "index number",
758 },{
759 .name = "media",
760 .type = QEMU_OPT_STRING,
761 .help = "media type (disk, cdrom)",
762 },{
763 .name = "if",
764 .type = QEMU_OPT_STRING,
765 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
766 },{
767 .name = "cyls",
768 .type = QEMU_OPT_NUMBER,
769 .help = "number of cylinders (ide disk geometry)",
770 },{
771 .name = "heads",
772 .type = QEMU_OPT_NUMBER,
773 .help = "number of heads (ide disk geometry)",
774 },{
775 .name = "secs",
776 .type = QEMU_OPT_NUMBER,
777 .help = "number of sectors (ide disk geometry)",
778 },{
779 .name = "trans",
780 .type = QEMU_OPT_STRING,
781 .help = "chs translation (auto, lba, none)",
782 },{
783 .name = "boot",
784 .type = QEMU_OPT_BOOL,
785 .help = "(deprecated, ignored)",
786 },{
787 .name = "addr",
788 .type = QEMU_OPT_STRING,
789 .help = "pci address (virtio only)",
790 },{
791 .name = "serial",
792 .type = QEMU_OPT_STRING,
793 .help = "disk serial number",
794 },{
795 .name = "file",
796 .type = QEMU_OPT_STRING,
797 .help = "file name",
798 },
799
800 /* Options that are passed on, but have special semantics with -drive */
801 {
802 .name = "read-only",
803 .type = QEMU_OPT_BOOL,
804 .help = "open drive file as read-only",
805 },{
806 .name = "rerror",
807 .type = QEMU_OPT_STRING,
808 .help = "read error action",
809 },{
810 .name = "werror",
811 .type = QEMU_OPT_STRING,
812 .help = "write error action",
813 },{
814 .name = "copy-on-read",
815 .type = QEMU_OPT_BOOL,
816 .help = "copy read data from backing file into image file",
817 },
818
819 { /* end of list */ }
820 },
821 };
822
823 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
824 {
825 const char *value;
826 BlockBackend *blk;
827 DriveInfo *dinfo = NULL;
828 QDict *bs_opts;
829 QemuOpts *legacy_opts;
830 DriveMediaType media = MEDIA_DISK;
831 BlockInterfaceType type;
832 int cyls, heads, secs, translation;
833 int max_devs, bus_id, unit_id, index;
834 const char *devaddr;
835 const char *werror, *rerror;
836 bool read_only = false;
837 bool copy_on_read;
838 const char *serial;
839 const char *filename;
840 Error *local_err = NULL;
841 int i;
842
843 /* Change legacy command line options into QMP ones */
844 static const struct {
845 const char *from;
846 const char *to;
847 } opt_renames[] = {
848 { "iops", "throttling.iops-total" },
849 { "iops_rd", "throttling.iops-read" },
850 { "iops_wr", "throttling.iops-write" },
851
852 { "bps", "throttling.bps-total" },
853 { "bps_rd", "throttling.bps-read" },
854 { "bps_wr", "throttling.bps-write" },
855
856 { "iops_max", "throttling.iops-total-max" },
857 { "iops_rd_max", "throttling.iops-read-max" },
858 { "iops_wr_max", "throttling.iops-write-max" },
859
860 { "bps_max", "throttling.bps-total-max" },
861 { "bps_rd_max", "throttling.bps-read-max" },
862 { "bps_wr_max", "throttling.bps-write-max" },
863
864 { "iops_size", "throttling.iops-size" },
865
866 { "group", "throttling.group" },
867
868 { "readonly", "read-only" },
869 };
870
871 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
872 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
873 &local_err);
874 if (local_err) {
875 error_report_err(local_err);
876 return NULL;
877 }
878 }
879
880 value = qemu_opt_get(all_opts, "cache");
881 if (value) {
882 int flags = 0;
883
884 if (bdrv_parse_cache_flags(value, &flags) != 0) {
885 error_report("invalid cache option");
886 return NULL;
887 }
888
889 /* Specific options take precedence */
890 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
891 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
892 !!(flags & BDRV_O_CACHE_WB), &error_abort);
893 }
894 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
895 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
896 !!(flags & BDRV_O_NOCACHE), &error_abort);
897 }
898 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
899 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
900 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
901 }
902 qemu_opt_unset(all_opts, "cache");
903 }
904
905 /* Get a QDict for processing the options */
906 bs_opts = qdict_new();
907 qemu_opts_to_qdict(all_opts, bs_opts);
908
909 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
910 &error_abort);
911 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
912 if (local_err) {
913 error_report_err(local_err);
914 goto fail;
915 }
916
917 /* Deprecated option boot=[on|off] */
918 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
919 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
920 "ignored. Future versions will reject this parameter. Please "
921 "update your scripts.\n");
922 }
923
924 /* Media type */
925 value = qemu_opt_get(legacy_opts, "media");
926 if (value) {
927 if (!strcmp(value, "disk")) {
928 media = MEDIA_DISK;
929 } else if (!strcmp(value, "cdrom")) {
930 media = MEDIA_CDROM;
931 read_only = true;
932 } else {
933 error_report("'%s' invalid media", value);
934 goto fail;
935 }
936 }
937
938 /* copy-on-read is disabled with a warning for read-only devices */
939 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
940 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
941
942 if (read_only && copy_on_read) {
943 error_report("warning: disabling copy-on-read on read-only drive");
944 copy_on_read = false;
945 }
946
947 qdict_put(bs_opts, "read-only",
948 qstring_from_str(read_only ? "on" : "off"));
949 qdict_put(bs_opts, "copy-on-read",
950 qstring_from_str(copy_on_read ? "on" :"off"));
951
952 /* Controller type */
953 value = qemu_opt_get(legacy_opts, "if");
954 if (value) {
955 for (type = 0;
956 type < IF_COUNT && strcmp(value, if_name[type]);
957 type++) {
958 }
959 if (type == IF_COUNT) {
960 error_report("unsupported bus type '%s'", value);
961 goto fail;
962 }
963 } else {
964 type = block_default_type;
965 }
966
967 /* Geometry */
968 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
969 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
970 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
971
972 if (cyls || heads || secs) {
973 if (cyls < 1) {
974 error_report("invalid physical cyls number");
975 goto fail;
976 }
977 if (heads < 1) {
978 error_report("invalid physical heads number");
979 goto fail;
980 }
981 if (secs < 1) {
982 error_report("invalid physical secs number");
983 goto fail;
984 }
985 }
986
987 translation = BIOS_ATA_TRANSLATION_AUTO;
988 value = qemu_opt_get(legacy_opts, "trans");
989 if (value != NULL) {
990 if (!cyls) {
991 error_report("'%s' trans must be used with cyls, heads and secs",
992 value);
993 goto fail;
994 }
995 if (!strcmp(value, "none")) {
996 translation = BIOS_ATA_TRANSLATION_NONE;
997 } else if (!strcmp(value, "lba")) {
998 translation = BIOS_ATA_TRANSLATION_LBA;
999 } else if (!strcmp(value, "large")) {
1000 translation = BIOS_ATA_TRANSLATION_LARGE;
1001 } else if (!strcmp(value, "rechs")) {
1002 translation = BIOS_ATA_TRANSLATION_RECHS;
1003 } else if (!strcmp(value, "auto")) {
1004 translation = BIOS_ATA_TRANSLATION_AUTO;
1005 } else {
1006 error_report("'%s' invalid translation type", value);
1007 goto fail;
1008 }
1009 }
1010
1011 if (media == MEDIA_CDROM) {
1012 if (cyls || secs || heads) {
1013 error_report("CHS can't be set with media=cdrom");
1014 goto fail;
1015 }
1016 }
1017
1018 /* Device address specified by bus/unit or index.
1019 * If none was specified, try to find the first free one. */
1020 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
1021 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
1022 index = qemu_opt_get_number(legacy_opts, "index", -1);
1023
1024 max_devs = if_max_devs[type];
1025
1026 if (index != -1) {
1027 if (bus_id != 0 || unit_id != -1) {
1028 error_report("index cannot be used with bus and unit");
1029 goto fail;
1030 }
1031 bus_id = drive_index_to_bus_id(type, index);
1032 unit_id = drive_index_to_unit_id(type, index);
1033 }
1034
1035 if (unit_id == -1) {
1036 unit_id = 0;
1037 while (drive_get(type, bus_id, unit_id) != NULL) {
1038 unit_id++;
1039 if (max_devs && unit_id >= max_devs) {
1040 unit_id -= max_devs;
1041 bus_id++;
1042 }
1043 }
1044 }
1045
1046 if (max_devs && unit_id >= max_devs) {
1047 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1048 goto fail;
1049 }
1050
1051 if (drive_get(type, bus_id, unit_id) != NULL) {
1052 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1053 bus_id, unit_id, index);
1054 goto fail;
1055 }
1056
1057 /* Serial number */
1058 serial = qemu_opt_get(legacy_opts, "serial");
1059
1060 /* no id supplied -> create one */
1061 if (qemu_opts_id(all_opts) == NULL) {
1062 char *new_id;
1063 const char *mediastr = "";
1064 if (type == IF_IDE || type == IF_SCSI) {
1065 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1066 }
1067 if (max_devs) {
1068 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1069 mediastr, unit_id);
1070 } else {
1071 new_id = g_strdup_printf("%s%s%i", if_name[type],
1072 mediastr, unit_id);
1073 }
1074 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1075 g_free(new_id);
1076 }
1077
1078 /* Add virtio block device */
1079 devaddr = qemu_opt_get(legacy_opts, "addr");
1080 if (devaddr && type != IF_VIRTIO) {
1081 error_report("addr is not supported by this bus type");
1082 goto fail;
1083 }
1084
1085 if (type == IF_VIRTIO) {
1086 QemuOpts *devopts;
1087 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1088 &error_abort);
1089 if (arch_type == QEMU_ARCH_S390X) {
1090 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1091 } else {
1092 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1093 }
1094 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1095 &error_abort);
1096 if (devaddr) {
1097 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1098 }
1099 }
1100
1101 filename = qemu_opt_get(legacy_opts, "file");
1102
1103 /* Check werror/rerror compatibility with if=... */
1104 werror = qemu_opt_get(legacy_opts, "werror");
1105 if (werror != NULL) {
1106 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1107 type != IF_NONE) {
1108 error_report("werror is not supported by this bus type");
1109 goto fail;
1110 }
1111 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1112 }
1113
1114 rerror = qemu_opt_get(legacy_opts, "rerror");
1115 if (rerror != NULL) {
1116 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1117 type != IF_NONE) {
1118 error_report("rerror is not supported by this bus type");
1119 goto fail;
1120 }
1121 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1122 }
1123
1124 /* Actual block device init: Functionality shared with blockdev-add */
1125 blk = blockdev_init(filename, bs_opts, &local_err);
1126 bs_opts = NULL;
1127 if (!blk) {
1128 if (local_err) {
1129 error_report_err(local_err);
1130 }
1131 goto fail;
1132 } else {
1133 assert(!local_err);
1134 }
1135
1136 /* Create legacy DriveInfo */
1137 dinfo = g_malloc0(sizeof(*dinfo));
1138 dinfo->opts = all_opts;
1139
1140 dinfo->cyls = cyls;
1141 dinfo->heads = heads;
1142 dinfo->secs = secs;
1143 dinfo->trans = translation;
1144
1145 dinfo->type = type;
1146 dinfo->bus = bus_id;
1147 dinfo->unit = unit_id;
1148 dinfo->devaddr = devaddr;
1149 dinfo->serial = g_strdup(serial);
1150
1151 blk_set_legacy_dinfo(blk, dinfo);
1152
1153 switch(type) {
1154 case IF_IDE:
1155 case IF_SCSI:
1156 case IF_XEN:
1157 case IF_NONE:
1158 dinfo->media_cd = media == MEDIA_CDROM;
1159 break;
1160 default:
1161 break;
1162 }
1163
1164 fail:
1165 qemu_opts_del(legacy_opts);
1166 QDECREF(bs_opts);
1167 return dinfo;
1168 }
1169
1170 void hmp_commit(Monitor *mon, const QDict *qdict)
1171 {
1172 const char *device = qdict_get_str(qdict, "device");
1173 BlockBackend *blk;
1174 int ret;
1175
1176 if (!strcmp(device, "all")) {
1177 ret = bdrv_commit_all();
1178 } else {
1179 BlockDriverState *bs;
1180 AioContext *aio_context;
1181
1182 blk = blk_by_name(device);
1183 if (!blk) {
1184 monitor_printf(mon, "Device '%s' not found\n", device);
1185 return;
1186 }
1187 if (!blk_is_available(blk)) {
1188 monitor_printf(mon, "Device '%s' has no medium\n", device);
1189 return;
1190 }
1191
1192 bs = blk_bs(blk);
1193 aio_context = bdrv_get_aio_context(bs);
1194 aio_context_acquire(aio_context);
1195
1196 ret = bdrv_commit(bs);
1197
1198 aio_context_release(aio_context);
1199 }
1200 if (ret < 0) {
1201 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1202 strerror(-ret));
1203 }
1204 }
1205
1206 static void blockdev_do_action(TransactionActionKind type, void *data,
1207 Error **errp)
1208 {
1209 TransactionAction action;
1210 TransactionActionList list;
1211
1212 action.type = type;
1213 action.u.data = data;
1214 list.value = &action;
1215 list.next = NULL;
1216 qmp_transaction(&list, false, NULL, errp);
1217 }
1218
1219 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1220 bool has_node_name, const char *node_name,
1221 const char *snapshot_file,
1222 bool has_snapshot_node_name,
1223 const char *snapshot_node_name,
1224 bool has_format, const char *format,
1225 bool has_mode, NewImageMode mode, Error **errp)
1226 {
1227 BlockdevSnapshotSync snapshot = {
1228 .has_device = has_device,
1229 .device = (char *) device,
1230 .has_node_name = has_node_name,
1231 .node_name = (char *) node_name,
1232 .snapshot_file = (char *) snapshot_file,
1233 .has_snapshot_node_name = has_snapshot_node_name,
1234 .snapshot_node_name = (char *) snapshot_node_name,
1235 .has_format = has_format,
1236 .format = (char *) format,
1237 .has_mode = has_mode,
1238 .mode = mode,
1239 };
1240 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1241 &snapshot, errp);
1242 }
1243
1244 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1245 Error **errp)
1246 {
1247 BlockdevSnapshot snapshot_data = {
1248 .node = (char *) node,
1249 .overlay = (char *) overlay
1250 };
1251
1252 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1253 &snapshot_data, errp);
1254 }
1255
1256 void qmp_blockdev_snapshot_internal_sync(const char *device,
1257 const char *name,
1258 Error **errp)
1259 {
1260 BlockdevSnapshotInternal snapshot = {
1261 .device = (char *) device,
1262 .name = (char *) name
1263 };
1264
1265 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1266 &snapshot, errp);
1267 }
1268
1269 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1270 bool has_id,
1271 const char *id,
1272 bool has_name,
1273 const char *name,
1274 Error **errp)
1275 {
1276 BlockDriverState *bs;
1277 BlockBackend *blk;
1278 AioContext *aio_context;
1279 QEMUSnapshotInfo sn;
1280 Error *local_err = NULL;
1281 SnapshotInfo *info = NULL;
1282 int ret;
1283
1284 blk = blk_by_name(device);
1285 if (!blk) {
1286 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1287 "Device '%s' not found", device);
1288 return NULL;
1289 }
1290
1291 aio_context = blk_get_aio_context(blk);
1292 aio_context_acquire(aio_context);
1293
1294 if (!has_id) {
1295 id = NULL;
1296 }
1297
1298 if (!has_name) {
1299 name = NULL;
1300 }
1301
1302 if (!id && !name) {
1303 error_setg(errp, "Name or id must be provided");
1304 goto out_aio_context;
1305 }
1306
1307 if (!blk_is_available(blk)) {
1308 error_setg(errp, "Device '%s' has no medium", device);
1309 goto out_aio_context;
1310 }
1311 bs = blk_bs(blk);
1312
1313 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1314 goto out_aio_context;
1315 }
1316
1317 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1318 if (local_err) {
1319 error_propagate(errp, local_err);
1320 goto out_aio_context;
1321 }
1322 if (!ret) {
1323 error_setg(errp,
1324 "Snapshot with id '%s' and name '%s' does not exist on "
1325 "device '%s'",
1326 STR_OR_NULL(id), STR_OR_NULL(name), device);
1327 goto out_aio_context;
1328 }
1329
1330 bdrv_snapshot_delete(bs, id, name, &local_err);
1331 if (local_err) {
1332 error_propagate(errp, local_err);
1333 goto out_aio_context;
1334 }
1335
1336 aio_context_release(aio_context);
1337
1338 info = g_new0(SnapshotInfo, 1);
1339 info->id = g_strdup(sn.id_str);
1340 info->name = g_strdup(sn.name);
1341 info->date_nsec = sn.date_nsec;
1342 info->date_sec = sn.date_sec;
1343 info->vm_state_size = sn.vm_state_size;
1344 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1345 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1346
1347 return info;
1348
1349 out_aio_context:
1350 aio_context_release(aio_context);
1351 return NULL;
1352 }
1353
1354 /**
1355 * block_dirty_bitmap_lookup:
1356 * Return a dirty bitmap (if present), after validating
1357 * the node reference and bitmap names.
1358 *
1359 * @node: The name of the BDS node to search for bitmaps
1360 * @name: The name of the bitmap to search for
1361 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1362 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1363 * @errp: Output pointer for error information. Can be NULL.
1364 *
1365 * @return: A bitmap object on success, or NULL on failure.
1366 */
1367 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1368 const char *name,
1369 BlockDriverState **pbs,
1370 AioContext **paio,
1371 Error **errp)
1372 {
1373 BlockDriverState *bs;
1374 BdrvDirtyBitmap *bitmap;
1375 AioContext *aio_context;
1376
1377 if (!node) {
1378 error_setg(errp, "Node cannot be NULL");
1379 return NULL;
1380 }
1381 if (!name) {
1382 error_setg(errp, "Bitmap name cannot be NULL");
1383 return NULL;
1384 }
1385 bs = bdrv_lookup_bs(node, node, NULL);
1386 if (!bs) {
1387 error_setg(errp, "Node '%s' not found", node);
1388 return NULL;
1389 }
1390
1391 aio_context = bdrv_get_aio_context(bs);
1392 aio_context_acquire(aio_context);
1393
1394 bitmap = bdrv_find_dirty_bitmap(bs, name);
1395 if (!bitmap) {
1396 error_setg(errp, "Dirty bitmap '%s' not found", name);
1397 goto fail;
1398 }
1399
1400 if (pbs) {
1401 *pbs = bs;
1402 }
1403 if (paio) {
1404 *paio = aio_context;
1405 } else {
1406 aio_context_release(aio_context);
1407 }
1408
1409 return bitmap;
1410
1411 fail:
1412 aio_context_release(aio_context);
1413 return NULL;
1414 }
1415
1416 /* New and old BlockDriverState structs for atomic group operations */
1417
1418 typedef struct BlkActionState BlkActionState;
1419
1420 /**
1421 * BlkActionOps:
1422 * Table of operations that define an Action.
1423 *
1424 * @instance_size: Size of state struct, in bytes.
1425 * @prepare: Prepare the work, must NOT be NULL.
1426 * @commit: Commit the changes, can be NULL.
1427 * @abort: Abort the changes on fail, can be NULL.
1428 * @clean: Clean up resources after all transaction actions have called
1429 * commit() or abort(). Can be NULL.
1430 *
1431 * Only prepare() may fail. In a single transaction, only one of commit() or
1432 * abort() will be called. clean() will always be called if it is present.
1433 */
1434 typedef struct BlkActionOps {
1435 size_t instance_size;
1436 void (*prepare)(BlkActionState *common, Error **errp);
1437 void (*commit)(BlkActionState *common);
1438 void (*abort)(BlkActionState *common);
1439 void (*clean)(BlkActionState *common);
1440 } BlkActionOps;
1441
1442 /**
1443 * BlkActionState:
1444 * Describes one Action's state within a Transaction.
1445 *
1446 * @action: QAPI-defined enum identifying which Action to perform.
1447 * @ops: Table of ActionOps this Action can perform.
1448 * @block_job_txn: Transaction which this action belongs to.
1449 * @entry: List membership for all Actions in this Transaction.
1450 *
1451 * This structure must be arranged as first member in a subclassed type,
1452 * assuming that the compiler will also arrange it to the same offsets as the
1453 * base class.
1454 */
1455 struct BlkActionState {
1456 TransactionAction *action;
1457 const BlkActionOps *ops;
1458 BlockJobTxn *block_job_txn;
1459 TransactionProperties *txn_props;
1460 QSIMPLEQ_ENTRY(BlkActionState) entry;
1461 };
1462
1463 /* internal snapshot private data */
1464 typedef struct InternalSnapshotState {
1465 BlkActionState common;
1466 BlockDriverState *bs;
1467 AioContext *aio_context;
1468 QEMUSnapshotInfo sn;
1469 bool created;
1470 } InternalSnapshotState;
1471
1472
1473 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1474 {
1475 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1476 error_setg(errp,
1477 "Action '%s' does not support Transaction property "
1478 "completion-mode = %s",
1479 TransactionActionKind_lookup[s->action->type],
1480 ActionCompletionMode_lookup[s->txn_props->completion_mode]);
1481 return -1;
1482 }
1483 return 0;
1484 }
1485
1486 static void internal_snapshot_prepare(BlkActionState *common,
1487 Error **errp)
1488 {
1489 Error *local_err = NULL;
1490 const char *device;
1491 const char *name;
1492 BlockBackend *blk;
1493 BlockDriverState *bs;
1494 QEMUSnapshotInfo old_sn, *sn;
1495 bool ret;
1496 qemu_timeval tv;
1497 BlockdevSnapshotInternal *internal;
1498 InternalSnapshotState *state;
1499 int ret1;
1500
1501 g_assert(common->action->type ==
1502 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1503 internal = common->action->u.blockdev_snapshot_internal_sync;
1504 state = DO_UPCAST(InternalSnapshotState, common, common);
1505
1506 /* 1. parse input */
1507 device = internal->device;
1508 name = internal->name;
1509
1510 /* 2. check for validation */
1511 if (action_check_completion_mode(common, errp) < 0) {
1512 return;
1513 }
1514
1515 blk = blk_by_name(device);
1516 if (!blk) {
1517 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1518 "Device '%s' not found", device);
1519 return;
1520 }
1521
1522 /* AioContext is released in .clean() */
1523 state->aio_context = blk_get_aio_context(blk);
1524 aio_context_acquire(state->aio_context);
1525
1526 if (!blk_is_available(blk)) {
1527 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1528 return;
1529 }
1530 bs = blk_bs(blk);
1531
1532 state->bs = bs;
1533 bdrv_drained_begin(bs);
1534
1535 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1536 return;
1537 }
1538
1539 if (bdrv_is_read_only(bs)) {
1540 error_setg(errp, "Device '%s' is read only", device);
1541 return;
1542 }
1543
1544 if (!bdrv_can_snapshot(bs)) {
1545 error_setg(errp, "Block format '%s' used by device '%s' "
1546 "does not support internal snapshots",
1547 bs->drv->format_name, device);
1548 return;
1549 }
1550
1551 if (!strlen(name)) {
1552 error_setg(errp, "Name is empty");
1553 return;
1554 }
1555
1556 /* check whether a snapshot with name exist */
1557 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1558 &local_err);
1559 if (local_err) {
1560 error_propagate(errp, local_err);
1561 return;
1562 } else if (ret) {
1563 error_setg(errp,
1564 "Snapshot with name '%s' already exists on device '%s'",
1565 name, device);
1566 return;
1567 }
1568
1569 /* 3. take the snapshot */
1570 sn = &state->sn;
1571 pstrcpy(sn->name, sizeof(sn->name), name);
1572 qemu_gettimeofday(&tv);
1573 sn->date_sec = tv.tv_sec;
1574 sn->date_nsec = tv.tv_usec * 1000;
1575 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1576
1577 ret1 = bdrv_snapshot_create(bs, sn);
1578 if (ret1 < 0) {
1579 error_setg_errno(errp, -ret1,
1580 "Failed to create snapshot '%s' on device '%s'",
1581 name, device);
1582 return;
1583 }
1584
1585 /* 4. succeed, mark a snapshot is created */
1586 state->created = true;
1587 }
1588
1589 static void internal_snapshot_abort(BlkActionState *common)
1590 {
1591 InternalSnapshotState *state =
1592 DO_UPCAST(InternalSnapshotState, common, common);
1593 BlockDriverState *bs = state->bs;
1594 QEMUSnapshotInfo *sn = &state->sn;
1595 Error *local_error = NULL;
1596
1597 if (!state->created) {
1598 return;
1599 }
1600
1601 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1602 error_reportf_err(local_error,
1603 "Failed to delete snapshot with id '%s' and "
1604 "name '%s' on device '%s' in abort: ",
1605 sn->id_str, sn->name,
1606 bdrv_get_device_name(bs));
1607 }
1608 }
1609
1610 static void internal_snapshot_clean(BlkActionState *common)
1611 {
1612 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1613 common, common);
1614
1615 if (state->aio_context) {
1616 if (state->bs) {
1617 bdrv_drained_end(state->bs);
1618 }
1619 aio_context_release(state->aio_context);
1620 }
1621 }
1622
1623 /* external snapshot private data */
1624 typedef struct ExternalSnapshotState {
1625 BlkActionState common;
1626 BlockDriverState *old_bs;
1627 BlockDriverState *new_bs;
1628 AioContext *aio_context;
1629 } ExternalSnapshotState;
1630
1631 static void external_snapshot_prepare(BlkActionState *common,
1632 Error **errp)
1633 {
1634 int flags = 0, ret;
1635 QDict *options = NULL;
1636 Error *local_err = NULL;
1637 /* Device and node name of the image to generate the snapshot from */
1638 const char *device;
1639 const char *node_name;
1640 /* Reference to the new image (for 'blockdev-snapshot') */
1641 const char *snapshot_ref;
1642 /* File name of the new image (for 'blockdev-snapshot-sync') */
1643 const char *new_image_file;
1644 ExternalSnapshotState *state =
1645 DO_UPCAST(ExternalSnapshotState, common, common);
1646 TransactionAction *action = common->action;
1647
1648 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1649 * purpose but a different set of parameters */
1650 switch (action->type) {
1651 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1652 {
1653 BlockdevSnapshot *s = action->u.blockdev_snapshot;
1654 device = s->node;
1655 node_name = s->node;
1656 new_image_file = NULL;
1657 snapshot_ref = s->overlay;
1658 }
1659 break;
1660 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1661 {
1662 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1663 device = s->has_device ? s->device : NULL;
1664 node_name = s->has_node_name ? s->node_name : NULL;
1665 new_image_file = s->snapshot_file;
1666 snapshot_ref = NULL;
1667 }
1668 break;
1669 default:
1670 g_assert_not_reached();
1671 }
1672
1673 /* start processing */
1674 if (action_check_completion_mode(common, errp) < 0) {
1675 return;
1676 }
1677
1678 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1679 if (!state->old_bs) {
1680 return;
1681 }
1682
1683 /* Acquire AioContext now so any threads operating on old_bs stop */
1684 state->aio_context = bdrv_get_aio_context(state->old_bs);
1685 aio_context_acquire(state->aio_context);
1686 bdrv_drained_begin(state->old_bs);
1687
1688 if (!bdrv_is_inserted(state->old_bs)) {
1689 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1690 return;
1691 }
1692
1693 if (bdrv_op_is_blocked(state->old_bs,
1694 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1695 return;
1696 }
1697
1698 if (!bdrv_is_read_only(state->old_bs)) {
1699 if (bdrv_flush(state->old_bs)) {
1700 error_setg(errp, QERR_IO_ERROR);
1701 return;
1702 }
1703 }
1704
1705 if (!bdrv_is_first_non_filter(state->old_bs)) {
1706 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1707 return;
1708 }
1709
1710 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1711 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1712 const char *format = s->has_format ? s->format : "qcow2";
1713 enum NewImageMode mode;
1714 const char *snapshot_node_name =
1715 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1716
1717 if (node_name && !snapshot_node_name) {
1718 error_setg(errp, "New snapshot node name missing");
1719 return;
1720 }
1721
1722 if (snapshot_node_name &&
1723 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1724 error_setg(errp, "New snapshot node name already in use");
1725 return;
1726 }
1727
1728 flags = state->old_bs->open_flags;
1729
1730 /* create new image w/backing file */
1731 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1732 if (mode != NEW_IMAGE_MODE_EXISTING) {
1733 bdrv_img_create(new_image_file, format,
1734 state->old_bs->filename,
1735 state->old_bs->drv->format_name,
1736 NULL, -1, flags, &local_err, false);
1737 if (local_err) {
1738 error_propagate(errp, local_err);
1739 return;
1740 }
1741 }
1742
1743 options = qdict_new();
1744 if (s->has_snapshot_node_name) {
1745 qdict_put(options, "node-name",
1746 qstring_from_str(snapshot_node_name));
1747 }
1748 qdict_put(options, "driver", qstring_from_str(format));
1749
1750 flags |= BDRV_O_NO_BACKING;
1751 }
1752
1753 assert(state->new_bs == NULL);
1754 ret = bdrv_open(&state->new_bs, new_image_file, snapshot_ref, options,
1755 flags, errp);
1756 /* We will manually add the backing_hd field to the bs later */
1757 if (ret != 0) {
1758 return;
1759 }
1760
1761 if (state->new_bs->blk != NULL) {
1762 error_setg(errp, "The snapshot is already in use by %s",
1763 blk_name(state->new_bs->blk));
1764 return;
1765 }
1766
1767 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1768 errp)) {
1769 return;
1770 }
1771
1772 if (state->new_bs->backing != NULL) {
1773 error_setg(errp, "The snapshot already has a backing image");
1774 return;
1775 }
1776
1777 if (!state->new_bs->drv->supports_backing) {
1778 error_setg(errp, "The snapshot does not support backing images");
1779 }
1780 }
1781
1782 static void external_snapshot_commit(BlkActionState *common)
1783 {
1784 ExternalSnapshotState *state =
1785 DO_UPCAST(ExternalSnapshotState, common, common);
1786
1787 bdrv_set_aio_context(state->new_bs, state->aio_context);
1788
1789 /* This removes our old bs and adds the new bs */
1790 bdrv_append(state->new_bs, state->old_bs);
1791 /* We don't need (or want) to use the transactional
1792 * bdrv_reopen_multiple() across all the entries at once, because we
1793 * don't want to abort all of them if one of them fails the reopen */
1794 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1795 NULL);
1796 }
1797
1798 static void external_snapshot_abort(BlkActionState *common)
1799 {
1800 ExternalSnapshotState *state =
1801 DO_UPCAST(ExternalSnapshotState, common, common);
1802 if (state->new_bs) {
1803 bdrv_unref(state->new_bs);
1804 }
1805 }
1806
1807 static void external_snapshot_clean(BlkActionState *common)
1808 {
1809 ExternalSnapshotState *state =
1810 DO_UPCAST(ExternalSnapshotState, common, common);
1811 if (state->aio_context) {
1812 bdrv_drained_end(state->old_bs);
1813 aio_context_release(state->aio_context);
1814 }
1815 }
1816
1817 typedef struct DriveBackupState {
1818 BlkActionState common;
1819 BlockDriverState *bs;
1820 AioContext *aio_context;
1821 BlockJob *job;
1822 } DriveBackupState;
1823
1824 static void do_drive_backup(const char *device, const char *target,
1825 bool has_format, const char *format,
1826 enum MirrorSyncMode sync,
1827 bool has_mode, enum NewImageMode mode,
1828 bool has_speed, int64_t speed,
1829 bool has_bitmap, const char *bitmap,
1830 bool has_on_source_error,
1831 BlockdevOnError on_source_error,
1832 bool has_on_target_error,
1833 BlockdevOnError on_target_error,
1834 BlockJobTxn *txn, Error **errp);
1835
1836 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1837 {
1838 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1839 BlockBackend *blk;
1840 DriveBackup *backup;
1841 Error *local_err = NULL;
1842
1843 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1844 backup = common->action->u.drive_backup;
1845
1846 blk = blk_by_name(backup->device);
1847 if (!blk) {
1848 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1849 "Device '%s' not found", backup->device);
1850 return;
1851 }
1852
1853 if (!blk_is_available(blk)) {
1854 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1855 return;
1856 }
1857
1858 /* AioContext is released in .clean() */
1859 state->aio_context = blk_get_aio_context(blk);
1860 aio_context_acquire(state->aio_context);
1861 bdrv_drained_begin(blk_bs(blk));
1862 state->bs = blk_bs(blk);
1863
1864 do_drive_backup(backup->device, backup->target,
1865 backup->has_format, backup->format,
1866 backup->sync,
1867 backup->has_mode, backup->mode,
1868 backup->has_speed, backup->speed,
1869 backup->has_bitmap, backup->bitmap,
1870 backup->has_on_source_error, backup->on_source_error,
1871 backup->has_on_target_error, backup->on_target_error,
1872 common->block_job_txn, &local_err);
1873 if (local_err) {
1874 error_propagate(errp, local_err);
1875 return;
1876 }
1877
1878 state->job = state->bs->job;
1879 }
1880
1881 static void drive_backup_abort(BlkActionState *common)
1882 {
1883 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1884 BlockDriverState *bs = state->bs;
1885
1886 /* Only cancel if it's the job we started */
1887 if (bs && bs->job && bs->job == state->job) {
1888 block_job_cancel_sync(bs->job);
1889 }
1890 }
1891
1892 static void drive_backup_clean(BlkActionState *common)
1893 {
1894 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1895
1896 if (state->aio_context) {
1897 bdrv_drained_end(state->bs);
1898 aio_context_release(state->aio_context);
1899 }
1900 }
1901
1902 typedef struct BlockdevBackupState {
1903 BlkActionState common;
1904 BlockDriverState *bs;
1905 BlockJob *job;
1906 AioContext *aio_context;
1907 } BlockdevBackupState;
1908
1909 static void do_blockdev_backup(const char *device, const char *target,
1910 enum MirrorSyncMode sync,
1911 bool has_speed, int64_t speed,
1912 bool has_on_source_error,
1913 BlockdevOnError on_source_error,
1914 bool has_on_target_error,
1915 BlockdevOnError on_target_error,
1916 BlockJobTxn *txn, Error **errp);
1917
1918 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1919 {
1920 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1921 BlockdevBackup *backup;
1922 BlockBackend *blk, *target;
1923 Error *local_err = NULL;
1924
1925 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1926 backup = common->action->u.blockdev_backup;
1927
1928 blk = blk_by_name(backup->device);
1929 if (!blk) {
1930 error_setg(errp, "Device '%s' not found", backup->device);
1931 return;
1932 }
1933
1934 if (!blk_is_available(blk)) {
1935 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1936 return;
1937 }
1938
1939 target = blk_by_name(backup->target);
1940 if (!target) {
1941 error_setg(errp, "Device '%s' not found", backup->target);
1942 return;
1943 }
1944
1945 /* AioContext is released in .clean() */
1946 state->aio_context = blk_get_aio_context(blk);
1947 if (state->aio_context != blk_get_aio_context(target)) {
1948 state->aio_context = NULL;
1949 error_setg(errp, "Backup between two IO threads is not implemented");
1950 return;
1951 }
1952 aio_context_acquire(state->aio_context);
1953 state->bs = blk_bs(blk);
1954 bdrv_drained_begin(state->bs);
1955
1956 do_blockdev_backup(backup->device, backup->target,
1957 backup->sync,
1958 backup->has_speed, backup->speed,
1959 backup->has_on_source_error, backup->on_source_error,
1960 backup->has_on_target_error, backup->on_target_error,
1961 common->block_job_txn, &local_err);
1962 if (local_err) {
1963 error_propagate(errp, local_err);
1964 return;
1965 }
1966
1967 state->job = state->bs->job;
1968 }
1969
1970 static void blockdev_backup_abort(BlkActionState *common)
1971 {
1972 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1973 BlockDriverState *bs = state->bs;
1974
1975 /* Only cancel if it's the job we started */
1976 if (bs && bs->job && bs->job == state->job) {
1977 block_job_cancel_sync(bs->job);
1978 }
1979 }
1980
1981 static void blockdev_backup_clean(BlkActionState *common)
1982 {
1983 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1984
1985 if (state->aio_context) {
1986 bdrv_drained_end(state->bs);
1987 aio_context_release(state->aio_context);
1988 }
1989 }
1990
1991 typedef struct BlockDirtyBitmapState {
1992 BlkActionState common;
1993 BdrvDirtyBitmap *bitmap;
1994 BlockDriverState *bs;
1995 AioContext *aio_context;
1996 HBitmap *backup;
1997 bool prepared;
1998 } BlockDirtyBitmapState;
1999
2000 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2001 Error **errp)
2002 {
2003 Error *local_err = NULL;
2004 BlockDirtyBitmapAdd *action;
2005 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2006 common, common);
2007
2008 if (action_check_completion_mode(common, errp) < 0) {
2009 return;
2010 }
2011
2012 action = common->action->u.block_dirty_bitmap_add;
2013 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2014 qmp_block_dirty_bitmap_add(action->node, action->name,
2015 action->has_granularity, action->granularity,
2016 &local_err);
2017
2018 if (!local_err) {
2019 state->prepared = true;
2020 } else {
2021 error_propagate(errp, local_err);
2022 }
2023 }
2024
2025 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2026 {
2027 BlockDirtyBitmapAdd *action;
2028 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2029 common, common);
2030
2031 action = common->action->u.block_dirty_bitmap_add;
2032 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2033 * then the node reference and bitmap name must have been valid.
2034 */
2035 if (state->prepared) {
2036 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2037 }
2038 }
2039
2040 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2041 Error **errp)
2042 {
2043 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2044 common, common);
2045 BlockDirtyBitmap *action;
2046
2047 if (action_check_completion_mode(common, errp) < 0) {
2048 return;
2049 }
2050
2051 action = common->action->u.block_dirty_bitmap_clear;
2052 state->bitmap = block_dirty_bitmap_lookup(action->node,
2053 action->name,
2054 &state->bs,
2055 &state->aio_context,
2056 errp);
2057 if (!state->bitmap) {
2058 return;
2059 }
2060
2061 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2062 error_setg(errp, "Cannot modify a frozen bitmap");
2063 return;
2064 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2065 error_setg(errp, "Cannot clear a disabled bitmap");
2066 return;
2067 }
2068
2069 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2070 /* AioContext is released in .clean() */
2071 }
2072
2073 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2074 {
2075 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2076 common, common);
2077
2078 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2079 }
2080
2081 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2082 {
2083 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2084 common, common);
2085
2086 hbitmap_free(state->backup);
2087 }
2088
2089 static void block_dirty_bitmap_clear_clean(BlkActionState *common)
2090 {
2091 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2092 common, common);
2093
2094 if (state->aio_context) {
2095 aio_context_release(state->aio_context);
2096 }
2097 }
2098
2099 static void abort_prepare(BlkActionState *common, Error **errp)
2100 {
2101 error_setg(errp, "Transaction aborted using Abort action");
2102 }
2103
2104 static void abort_commit(BlkActionState *common)
2105 {
2106 g_assert_not_reached(); /* this action never succeeds */
2107 }
2108
2109 static const BlkActionOps actions[] = {
2110 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2111 .instance_size = sizeof(ExternalSnapshotState),
2112 .prepare = external_snapshot_prepare,
2113 .commit = external_snapshot_commit,
2114 .abort = external_snapshot_abort,
2115 .clean = external_snapshot_clean,
2116 },
2117 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2118 .instance_size = sizeof(ExternalSnapshotState),
2119 .prepare = external_snapshot_prepare,
2120 .commit = external_snapshot_commit,
2121 .abort = external_snapshot_abort,
2122 .clean = external_snapshot_clean,
2123 },
2124 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2125 .instance_size = sizeof(DriveBackupState),
2126 .prepare = drive_backup_prepare,
2127 .abort = drive_backup_abort,
2128 .clean = drive_backup_clean,
2129 },
2130 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2131 .instance_size = sizeof(BlockdevBackupState),
2132 .prepare = blockdev_backup_prepare,
2133 .abort = blockdev_backup_abort,
2134 .clean = blockdev_backup_clean,
2135 },
2136 [TRANSACTION_ACTION_KIND_ABORT] = {
2137 .instance_size = sizeof(BlkActionState),
2138 .prepare = abort_prepare,
2139 .commit = abort_commit,
2140 },
2141 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2142 .instance_size = sizeof(InternalSnapshotState),
2143 .prepare = internal_snapshot_prepare,
2144 .abort = internal_snapshot_abort,
2145 .clean = internal_snapshot_clean,
2146 },
2147 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2148 .instance_size = sizeof(BlockDirtyBitmapState),
2149 .prepare = block_dirty_bitmap_add_prepare,
2150 .abort = block_dirty_bitmap_add_abort,
2151 },
2152 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2153 .instance_size = sizeof(BlockDirtyBitmapState),
2154 .prepare = block_dirty_bitmap_clear_prepare,
2155 .commit = block_dirty_bitmap_clear_commit,
2156 .abort = block_dirty_bitmap_clear_abort,
2157 .clean = block_dirty_bitmap_clear_clean,
2158 }
2159 };
2160
2161 /**
2162 * Allocate a TransactionProperties structure if necessary, and fill
2163 * that structure with desired defaults if they are unset.
2164 */
2165 static TransactionProperties *get_transaction_properties(
2166 TransactionProperties *props)
2167 {
2168 if (!props) {
2169 props = g_new0(TransactionProperties, 1);
2170 }
2171
2172 if (!props->has_completion_mode) {
2173 props->has_completion_mode = true;
2174 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2175 }
2176
2177 return props;
2178 }
2179
2180 /*
2181 * 'Atomic' group operations. The operations are performed as a set, and if
2182 * any fail then we roll back all operations in the group.
2183 */
2184 void qmp_transaction(TransactionActionList *dev_list,
2185 bool has_props,
2186 struct TransactionProperties *props,
2187 Error **errp)
2188 {
2189 TransactionActionList *dev_entry = dev_list;
2190 BlockJobTxn *block_job_txn = NULL;
2191 BlkActionState *state, *next;
2192 Error *local_err = NULL;
2193
2194 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2195 QSIMPLEQ_INIT(&snap_bdrv_states);
2196
2197 /* Does this transaction get canceled as a group on failure?
2198 * If not, we don't really need to make a BlockJobTxn.
2199 */
2200 props = get_transaction_properties(props);
2201 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2202 block_job_txn = block_job_txn_new();
2203 }
2204
2205 /* drain all i/o before any operations */
2206 bdrv_drain_all();
2207
2208 /* We don't do anything in this loop that commits us to the operations */
2209 while (NULL != dev_entry) {
2210 TransactionAction *dev_info = NULL;
2211 const BlkActionOps *ops;
2212
2213 dev_info = dev_entry->value;
2214 dev_entry = dev_entry->next;
2215
2216 assert(dev_info->type < ARRAY_SIZE(actions));
2217
2218 ops = &actions[dev_info->type];
2219 assert(ops->instance_size > 0);
2220
2221 state = g_malloc0(ops->instance_size);
2222 state->ops = ops;
2223 state->action = dev_info;
2224 state->block_job_txn = block_job_txn;
2225 state->txn_props = props;
2226 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2227
2228 state->ops->prepare(state, &local_err);
2229 if (local_err) {
2230 error_propagate(errp, local_err);
2231 goto delete_and_fail;
2232 }
2233 }
2234
2235 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2236 if (state->ops->commit) {
2237 state->ops->commit(state);
2238 }
2239 }
2240
2241 /* success */
2242 goto exit;
2243
2244 delete_and_fail:
2245 /* failure, and it is all-or-none; roll back all operations */
2246 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2247 if (state->ops->abort) {
2248 state->ops->abort(state);
2249 }
2250 }
2251 exit:
2252 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2253 if (state->ops->clean) {
2254 state->ops->clean(state);
2255 }
2256 g_free(state);
2257 }
2258 if (!has_props) {
2259 qapi_free_TransactionProperties(props);
2260 }
2261 block_job_txn_unref(block_job_txn);
2262 }
2263
2264 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
2265 {
2266 Error *local_err = NULL;
2267
2268 qmp_blockdev_open_tray(device, has_force, force, &local_err);
2269 if (local_err) {
2270 error_propagate(errp, local_err);
2271 return;
2272 }
2273
2274 qmp_x_blockdev_remove_medium(device, errp);
2275 }
2276
2277 void qmp_block_passwd(bool has_device, const char *device,
2278 bool has_node_name, const char *node_name,
2279 const char *password, Error **errp)
2280 {
2281 Error *local_err = NULL;
2282 BlockDriverState *bs;
2283 AioContext *aio_context;
2284
2285 bs = bdrv_lookup_bs(has_device ? device : NULL,
2286 has_node_name ? node_name : NULL,
2287 &local_err);
2288 if (local_err) {
2289 error_propagate(errp, local_err);
2290 return;
2291 }
2292
2293 aio_context = bdrv_get_aio_context(bs);
2294 aio_context_acquire(aio_context);
2295
2296 bdrv_add_key(bs, password, errp);
2297
2298 aio_context_release(aio_context);
2299 }
2300
2301 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force,
2302 Error **errp)
2303 {
2304 BlockBackend *blk;
2305 bool locked;
2306
2307 if (!has_force) {
2308 force = false;
2309 }
2310
2311 blk = blk_by_name(device);
2312 if (!blk) {
2313 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2314 "Device '%s' not found", device);
2315 return;
2316 }
2317
2318 if (!blk_dev_has_removable_media(blk)) {
2319 error_setg(errp, "Device '%s' is not removable", device);
2320 return;
2321 }
2322
2323 if (!blk_dev_has_tray(blk)) {
2324 /* Ignore this command on tray-less devices */
2325 return;
2326 }
2327
2328 if (blk_dev_is_tray_open(blk)) {
2329 return;
2330 }
2331
2332 locked = blk_dev_is_medium_locked(blk);
2333 if (locked) {
2334 blk_dev_eject_request(blk, force);
2335 }
2336
2337 if (!locked || force) {
2338 blk_dev_change_media_cb(blk, false);
2339 }
2340 }
2341
2342 void qmp_blockdev_close_tray(const char *device, Error **errp)
2343 {
2344 BlockBackend *blk;
2345
2346 blk = blk_by_name(device);
2347 if (!blk) {
2348 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2349 "Device '%s' not found", device);
2350 return;
2351 }
2352
2353 if (!blk_dev_has_removable_media(blk)) {
2354 error_setg(errp, "Device '%s' is not removable", device);
2355 return;
2356 }
2357
2358 if (!blk_dev_has_tray(blk)) {
2359 /* Ignore this command on tray-less devices */
2360 return;
2361 }
2362
2363 if (!blk_dev_is_tray_open(blk)) {
2364 return;
2365 }
2366
2367 blk_dev_change_media_cb(blk, true);
2368 }
2369
2370 void qmp_x_blockdev_remove_medium(const char *device, Error **errp)
2371 {
2372 BlockBackend *blk;
2373 BlockDriverState *bs;
2374 AioContext *aio_context;
2375 bool has_device;
2376
2377 blk = blk_by_name(device);
2378 if (!blk) {
2379 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2380 "Device '%s' not found", device);
2381 return;
2382 }
2383
2384 /* For BBs without a device, we can exchange the BDS tree at will */
2385 has_device = blk_get_attached_dev(blk);
2386
2387 if (has_device && !blk_dev_has_removable_media(blk)) {
2388 error_setg(errp, "Device '%s' is not removable", device);
2389 return;
2390 }
2391
2392 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2393 error_setg(errp, "Tray of device '%s' is not open", device);
2394 return;
2395 }
2396
2397 bs = blk_bs(blk);
2398 if (!bs) {
2399 return;
2400 }
2401
2402 aio_context = bdrv_get_aio_context(bs);
2403 aio_context_acquire(aio_context);
2404
2405 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2406 goto out;
2407 }
2408
2409 /* This follows the convention established by bdrv_make_anon() */
2410 if (bs->device_list.tqe_prev) {
2411 bdrv_device_remove(bs);
2412 }
2413
2414 blk_remove_bs(blk);
2415
2416 if (!blk_dev_has_tray(blk)) {
2417 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2418 * called at all); therefore, the medium needs to be ejected here.
2419 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2420 * value passed here (i.e. false). */
2421 blk_dev_change_media_cb(blk, false);
2422 }
2423
2424 out:
2425 aio_context_release(aio_context);
2426 }
2427
2428 static void qmp_blockdev_insert_anon_medium(const char *device,
2429 BlockDriverState *bs, Error **errp)
2430 {
2431 BlockBackend *blk;
2432 bool has_device;
2433
2434 blk = blk_by_name(device);
2435 if (!blk) {
2436 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2437 "Device '%s' not found", device);
2438 return;
2439 }
2440
2441 /* For BBs without a device, we can exchange the BDS tree at will */
2442 has_device = blk_get_attached_dev(blk);
2443
2444 if (has_device && !blk_dev_has_removable_media(blk)) {
2445 error_setg(errp, "Device '%s' is not removable", device);
2446 return;
2447 }
2448
2449 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2450 error_setg(errp, "Tray of device '%s' is not open", device);
2451 return;
2452 }
2453
2454 if (blk_bs(blk)) {
2455 error_setg(errp, "There already is a medium in device '%s'", device);
2456 return;
2457 }
2458
2459 blk_insert_bs(blk, bs);
2460
2461 QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list);
2462
2463 if (!blk_dev_has_tray(blk)) {
2464 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2465 * called at all); therefore, the medium needs to be pushed into the
2466 * slot here.
2467 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2468 * value passed here (i.e. true). */
2469 blk_dev_change_media_cb(blk, true);
2470 }
2471 }
2472
2473 void qmp_x_blockdev_insert_medium(const char *device, const char *node_name,
2474 Error **errp)
2475 {
2476 BlockDriverState *bs;
2477
2478 bs = bdrv_find_node(node_name);
2479 if (!bs) {
2480 error_setg(errp, "Node '%s' not found", node_name);
2481 return;
2482 }
2483
2484 if (bs->blk) {
2485 error_setg(errp, "Node '%s' is already in use by '%s'", node_name,
2486 blk_name(bs->blk));
2487 return;
2488 }
2489
2490 qmp_blockdev_insert_anon_medium(device, bs, errp);
2491 }
2492
2493 void qmp_blockdev_change_medium(const char *device, const char *filename,
2494 bool has_format, const char *format,
2495 bool has_read_only,
2496 BlockdevChangeReadOnlyMode read_only,
2497 Error **errp)
2498 {
2499 BlockBackend *blk;
2500 BlockDriverState *medium_bs = NULL;
2501 int bdrv_flags, ret;
2502 QDict *options = NULL;
2503 Error *err = NULL;
2504
2505 blk = blk_by_name(device);
2506 if (!blk) {
2507 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2508 "Device '%s' not found", device);
2509 goto fail;
2510 }
2511
2512 if (blk_bs(blk)) {
2513 blk_update_root_state(blk);
2514 }
2515
2516 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2517
2518 if (!has_read_only) {
2519 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2520 }
2521
2522 switch (read_only) {
2523 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2524 break;
2525
2526 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2527 bdrv_flags &= ~BDRV_O_RDWR;
2528 break;
2529
2530 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2531 bdrv_flags |= BDRV_O_RDWR;
2532 break;
2533
2534 default:
2535 abort();
2536 }
2537
2538 if (has_format) {
2539 options = qdict_new();
2540 qdict_put(options, "driver", qstring_from_str(format));
2541 }
2542
2543 assert(!medium_bs);
2544 ret = bdrv_open(&medium_bs, filename, NULL, options, bdrv_flags, errp);
2545 if (ret < 0) {
2546 goto fail;
2547 }
2548
2549 blk_apply_root_state(blk, medium_bs);
2550
2551 bdrv_add_key(medium_bs, NULL, &err);
2552 if (err) {
2553 error_propagate(errp, err);
2554 goto fail;
2555 }
2556
2557 qmp_blockdev_open_tray(device, false, false, &err);
2558 if (err) {
2559 error_propagate(errp, err);
2560 goto fail;
2561 }
2562
2563 qmp_x_blockdev_remove_medium(device, &err);
2564 if (err) {
2565 error_propagate(errp, err);
2566 goto fail;
2567 }
2568
2569 qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
2570 if (err) {
2571 error_propagate(errp, err);
2572 goto fail;
2573 }
2574
2575 qmp_blockdev_close_tray(device, errp);
2576
2577 fail:
2578 /* If the medium has been inserted, the device has its own reference, so
2579 * ours must be relinquished; and if it has not been inserted successfully,
2580 * the reference must be relinquished anyway */
2581 bdrv_unref(medium_bs);
2582 }
2583
2584 /* throttling disk I/O limits */
2585 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2586 int64_t bps_wr,
2587 int64_t iops,
2588 int64_t iops_rd,
2589 int64_t iops_wr,
2590 bool has_bps_max,
2591 int64_t bps_max,
2592 bool has_bps_rd_max,
2593 int64_t bps_rd_max,
2594 bool has_bps_wr_max,
2595 int64_t bps_wr_max,
2596 bool has_iops_max,
2597 int64_t iops_max,
2598 bool has_iops_rd_max,
2599 int64_t iops_rd_max,
2600 bool has_iops_wr_max,
2601 int64_t iops_wr_max,
2602 bool has_iops_size,
2603 int64_t iops_size,
2604 bool has_group,
2605 const char *group, Error **errp)
2606 {
2607 ThrottleConfig cfg;
2608 BlockDriverState *bs;
2609 BlockBackend *blk;
2610 AioContext *aio_context;
2611
2612 blk = blk_by_name(device);
2613 if (!blk) {
2614 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2615 "Device '%s' not found", device);
2616 return;
2617 }
2618
2619 aio_context = blk_get_aio_context(blk);
2620 aio_context_acquire(aio_context);
2621
2622 bs = blk_bs(blk);
2623 if (!bs) {
2624 error_setg(errp, "Device '%s' has no medium", device);
2625 goto out;
2626 }
2627
2628 memset(&cfg, 0, sizeof(cfg));
2629 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2630 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2631 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2632
2633 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2634 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2635 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2636
2637 if (has_bps_max) {
2638 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2639 }
2640 if (has_bps_rd_max) {
2641 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2642 }
2643 if (has_bps_wr_max) {
2644 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2645 }
2646 if (has_iops_max) {
2647 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2648 }
2649 if (has_iops_rd_max) {
2650 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2651 }
2652 if (has_iops_wr_max) {
2653 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2654 }
2655
2656 if (has_iops_size) {
2657 cfg.op_size = iops_size;
2658 }
2659
2660 if (!check_throttle_config(&cfg, errp)) {
2661 goto out;
2662 }
2663
2664 if (throttle_enabled(&cfg)) {
2665 /* Enable I/O limits if they're not enabled yet, otherwise
2666 * just update the throttling group. */
2667 if (!bs->throttle_state) {
2668 bdrv_io_limits_enable(bs, has_group ? group : device);
2669 } else if (has_group) {
2670 bdrv_io_limits_update_group(bs, group);
2671 }
2672 /* Set the new throttling configuration */
2673 bdrv_set_io_limits(bs, &cfg);
2674 } else if (bs->throttle_state) {
2675 /* If all throttling settings are set to 0, disable I/O limits */
2676 bdrv_io_limits_disable(bs);
2677 }
2678
2679 out:
2680 aio_context_release(aio_context);
2681 }
2682
2683 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2684 bool has_granularity, uint32_t granularity,
2685 Error **errp)
2686 {
2687 AioContext *aio_context;
2688 BlockDriverState *bs;
2689
2690 if (!name || name[0] == '\0') {
2691 error_setg(errp, "Bitmap name cannot be empty");
2692 return;
2693 }
2694
2695 bs = bdrv_lookup_bs(node, node, errp);
2696 if (!bs) {
2697 return;
2698 }
2699
2700 aio_context = bdrv_get_aio_context(bs);
2701 aio_context_acquire(aio_context);
2702
2703 if (has_granularity) {
2704 if (granularity < 512 || !is_power_of_2(granularity)) {
2705 error_setg(errp, "Granularity must be power of 2 "
2706 "and at least 512");
2707 goto out;
2708 }
2709 } else {
2710 /* Default to cluster size, if available: */
2711 granularity = bdrv_get_default_bitmap_granularity(bs);
2712 }
2713
2714 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2715
2716 out:
2717 aio_context_release(aio_context);
2718 }
2719
2720 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2721 Error **errp)
2722 {
2723 AioContext *aio_context;
2724 BlockDriverState *bs;
2725 BdrvDirtyBitmap *bitmap;
2726
2727 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2728 if (!bitmap || !bs) {
2729 return;
2730 }
2731
2732 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2733 error_setg(errp,
2734 "Bitmap '%s' is currently frozen and cannot be removed",
2735 name);
2736 goto out;
2737 }
2738 bdrv_dirty_bitmap_make_anon(bitmap);
2739 bdrv_release_dirty_bitmap(bs, bitmap);
2740
2741 out:
2742 aio_context_release(aio_context);
2743 }
2744
2745 /**
2746 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2747 * immediately after a full backup operation.
2748 */
2749 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2750 Error **errp)
2751 {
2752 AioContext *aio_context;
2753 BdrvDirtyBitmap *bitmap;
2754 BlockDriverState *bs;
2755
2756 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2757 if (!bitmap || !bs) {
2758 return;
2759 }
2760
2761 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2762 error_setg(errp,
2763 "Bitmap '%s' is currently frozen and cannot be modified",
2764 name);
2765 goto out;
2766 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2767 error_setg(errp,
2768 "Bitmap '%s' is currently disabled and cannot be cleared",
2769 name);
2770 goto out;
2771 }
2772
2773 bdrv_clear_dirty_bitmap(bitmap, NULL);
2774
2775 out:
2776 aio_context_release(aio_context);
2777 }
2778
2779 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2780 {
2781 const char *id = qdict_get_str(qdict, "id");
2782 BlockBackend *blk;
2783 BlockDriverState *bs;
2784 AioContext *aio_context;
2785 Error *local_err = NULL;
2786
2787 blk = blk_by_name(id);
2788 if (!blk) {
2789 error_report("Device '%s' not found", id);
2790 return;
2791 }
2792
2793 if (!blk_legacy_dinfo(blk)) {
2794 error_report("Deleting device added with blockdev-add"
2795 " is not supported");
2796 return;
2797 }
2798
2799 aio_context = blk_get_aio_context(blk);
2800 aio_context_acquire(aio_context);
2801
2802 bs = blk_bs(blk);
2803 if (bs) {
2804 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2805 error_report_err(local_err);
2806 aio_context_release(aio_context);
2807 return;
2808 }
2809
2810 blk_remove_bs(blk);
2811 }
2812
2813 /* if we have a device attached to this BlockDriverState
2814 * then we need to make the drive anonymous until the device
2815 * can be removed. If this is a drive with no device backing
2816 * then we can just get rid of the block driver state right here.
2817 */
2818 if (blk_get_attached_dev(blk)) {
2819 blk_hide_on_behalf_of_hmp_drive_del(blk);
2820 /* Further I/O must not pause the guest */
2821 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2822 BLOCKDEV_ON_ERROR_REPORT);
2823 } else {
2824 blk_unref(blk);
2825 }
2826
2827 aio_context_release(aio_context);
2828 }
2829
2830 void qmp_block_resize(bool has_device, const char *device,
2831 bool has_node_name, const char *node_name,
2832 int64_t size, Error **errp)
2833 {
2834 Error *local_err = NULL;
2835 BlockDriverState *bs;
2836 AioContext *aio_context;
2837 int ret;
2838
2839 bs = bdrv_lookup_bs(has_device ? device : NULL,
2840 has_node_name ? node_name : NULL,
2841 &local_err);
2842 if (local_err) {
2843 error_propagate(errp, local_err);
2844 return;
2845 }
2846
2847 aio_context = bdrv_get_aio_context(bs);
2848 aio_context_acquire(aio_context);
2849
2850 if (!bdrv_is_first_non_filter(bs)) {
2851 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2852 goto out;
2853 }
2854
2855 if (size < 0) {
2856 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2857 goto out;
2858 }
2859
2860 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2861 error_setg(errp, QERR_DEVICE_IN_USE, device);
2862 goto out;
2863 }
2864
2865 /* complete all in-flight operations before resizing the device */
2866 bdrv_drain_all();
2867
2868 ret = bdrv_truncate(bs, size);
2869 switch (ret) {
2870 case 0:
2871 break;
2872 case -ENOMEDIUM:
2873 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2874 break;
2875 case -ENOTSUP:
2876 error_setg(errp, QERR_UNSUPPORTED);
2877 break;
2878 case -EACCES:
2879 error_setg(errp, "Device '%s' is read only", device);
2880 break;
2881 case -EBUSY:
2882 error_setg(errp, QERR_DEVICE_IN_USE, device);
2883 break;
2884 default:
2885 error_setg_errno(errp, -ret, "Could not resize");
2886 break;
2887 }
2888
2889 out:
2890 aio_context_release(aio_context);
2891 }
2892
2893 static void block_job_cb(void *opaque, int ret)
2894 {
2895 /* Note that this function may be executed from another AioContext besides
2896 * the QEMU main loop. If you need to access anything that assumes the
2897 * QEMU global mutex, use a BH or introduce a mutex.
2898 */
2899
2900 BlockDriverState *bs = opaque;
2901 const char *msg = NULL;
2902
2903 trace_block_job_cb(bs, bs->job, ret);
2904
2905 assert(bs->job);
2906
2907 if (ret < 0) {
2908 msg = strerror(-ret);
2909 }
2910
2911 if (block_job_is_cancelled(bs->job)) {
2912 block_job_event_cancelled(bs->job);
2913 } else {
2914 block_job_event_completed(bs->job, msg);
2915 }
2916 }
2917
2918 void qmp_block_stream(const char *device,
2919 bool has_base, const char *base,
2920 bool has_backing_file, const char *backing_file,
2921 bool has_speed, int64_t speed,
2922 bool has_on_error, BlockdevOnError on_error,
2923 Error **errp)
2924 {
2925 BlockBackend *blk;
2926 BlockDriverState *bs;
2927 BlockDriverState *base_bs = NULL;
2928 AioContext *aio_context;
2929 Error *local_err = NULL;
2930 const char *base_name = NULL;
2931
2932 if (!has_on_error) {
2933 on_error = BLOCKDEV_ON_ERROR_REPORT;
2934 }
2935
2936 blk = blk_by_name(device);
2937 if (!blk) {
2938 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2939 "Device '%s' not found", device);
2940 return;
2941 }
2942
2943 aio_context = blk_get_aio_context(blk);
2944 aio_context_acquire(aio_context);
2945
2946 if (!blk_is_available(blk)) {
2947 error_setg(errp, "Device '%s' has no medium", device);
2948 goto out;
2949 }
2950 bs = blk_bs(blk);
2951
2952 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2953 goto out;
2954 }
2955
2956 if (has_base) {
2957 base_bs = bdrv_find_backing_image(bs, base);
2958 if (base_bs == NULL) {
2959 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2960 goto out;
2961 }
2962 assert(bdrv_get_aio_context(base_bs) == aio_context);
2963 base_name = base;
2964 }
2965
2966 /* if we are streaming the entire chain, the result will have no backing
2967 * file, and specifying one is therefore an error */
2968 if (base_bs == NULL && has_backing_file) {
2969 error_setg(errp, "backing file specified, but streaming the "
2970 "entire chain");
2971 goto out;
2972 }
2973
2974 /* backing_file string overrides base bs filename */
2975 base_name = has_backing_file ? backing_file : base_name;
2976
2977 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2978 on_error, block_job_cb, bs, &local_err);
2979 if (local_err) {
2980 error_propagate(errp, local_err);
2981 goto out;
2982 }
2983
2984 trace_qmp_block_stream(bs, bs->job);
2985
2986 out:
2987 aio_context_release(aio_context);
2988 }
2989
2990 void qmp_block_commit(const char *device,
2991 bool has_base, const char *base,
2992 bool has_top, const char *top,
2993 bool has_backing_file, const char *backing_file,
2994 bool has_speed, int64_t speed,
2995 Error **errp)
2996 {
2997 BlockBackend *blk;
2998 BlockDriverState *bs;
2999 BlockDriverState *base_bs, *top_bs;
3000 AioContext *aio_context;
3001 Error *local_err = NULL;
3002 /* This will be part of the QMP command, if/when the
3003 * BlockdevOnError change for blkmirror makes it in
3004 */
3005 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3006
3007 if (!has_speed) {
3008 speed = 0;
3009 }
3010
3011 /* Important Note:
3012 * libvirt relies on the DeviceNotFound error class in order to probe for
3013 * live commit feature versions; for this to work, we must make sure to
3014 * perform the device lookup before any generic errors that may occur in a
3015 * scenario in which all optional arguments are omitted. */
3016 blk = blk_by_name(device);
3017 if (!blk) {
3018 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3019 "Device '%s' not found", device);
3020 return;
3021 }
3022
3023 aio_context = blk_get_aio_context(blk);
3024 aio_context_acquire(aio_context);
3025
3026 if (!blk_is_available(blk)) {
3027 error_setg(errp, "Device '%s' has no medium", device);
3028 goto out;
3029 }
3030 bs = blk_bs(blk);
3031
3032 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3033 goto out;
3034 }
3035
3036 /* default top_bs is the active layer */
3037 top_bs = bs;
3038
3039 if (has_top && top) {
3040 if (strcmp(bs->filename, top) != 0) {
3041 top_bs = bdrv_find_backing_image(bs, top);
3042 }
3043 }
3044
3045 if (top_bs == NULL) {
3046 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3047 goto out;
3048 }
3049
3050 assert(bdrv_get_aio_context(top_bs) == aio_context);
3051
3052 if (has_base && base) {
3053 base_bs = bdrv_find_backing_image(top_bs, base);
3054 } else {
3055 base_bs = bdrv_find_base(top_bs);
3056 }
3057
3058 if (base_bs == NULL) {
3059 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3060 goto out;
3061 }
3062
3063 assert(bdrv_get_aio_context(base_bs) == aio_context);
3064
3065 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3066 goto out;
3067 }
3068
3069 /* Do not allow attempts to commit an image into itself */
3070 if (top_bs == base_bs) {
3071 error_setg(errp, "cannot commit an image into itself");
3072 goto out;
3073 }
3074
3075 if (top_bs == bs) {
3076 if (has_backing_file) {
3077 error_setg(errp, "'backing-file' specified,"
3078 " but 'top' is the active layer");
3079 goto out;
3080 }
3081 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
3082 bs, &local_err);
3083 } else {
3084 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
3085 has_backing_file ? backing_file : NULL, &local_err);
3086 }
3087 if (local_err != NULL) {
3088 error_propagate(errp, local_err);
3089 goto out;
3090 }
3091
3092 out:
3093 aio_context_release(aio_context);
3094 }
3095
3096 static void do_drive_backup(const char *device, const char *target,
3097 bool has_format, const char *format,
3098 enum MirrorSyncMode sync,
3099 bool has_mode, enum NewImageMode mode,
3100 bool has_speed, int64_t speed,
3101 bool has_bitmap, const char *bitmap,
3102 bool has_on_source_error,
3103 BlockdevOnError on_source_error,
3104 bool has_on_target_error,
3105 BlockdevOnError on_target_error,
3106 BlockJobTxn *txn, Error **errp)
3107 {
3108 BlockBackend *blk;
3109 BlockDriverState *bs;
3110 BlockDriverState *target_bs;
3111 BlockDriverState *source = NULL;
3112 BdrvDirtyBitmap *bmap = NULL;
3113 AioContext *aio_context;
3114 QDict *options = NULL;
3115 Error *local_err = NULL;
3116 int flags;
3117 int64_t size;
3118 int ret;
3119
3120 if (!has_speed) {
3121 speed = 0;
3122 }
3123 if (!has_on_source_error) {
3124 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3125 }
3126 if (!has_on_target_error) {
3127 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3128 }
3129 if (!has_mode) {
3130 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3131 }
3132
3133 blk = blk_by_name(device);
3134 if (!blk) {
3135 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3136 "Device '%s' not found", device);
3137 return;
3138 }
3139
3140 aio_context = blk_get_aio_context(blk);
3141 aio_context_acquire(aio_context);
3142
3143 /* Although backup_run has this check too, we need to use bs->drv below, so
3144 * do an early check redundantly. */
3145 if (!blk_is_available(blk)) {
3146 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3147 goto out;
3148 }
3149 bs = blk_bs(blk);
3150
3151 if (!has_format) {
3152 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3153 }
3154
3155 /* Early check to avoid creating target */
3156 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3157 goto out;
3158 }
3159
3160 flags = bs->open_flags | BDRV_O_RDWR;
3161
3162 /* See if we have a backing HD we can use to create our new image
3163 * on top of. */
3164 if (sync == MIRROR_SYNC_MODE_TOP) {
3165 source = backing_bs(bs);
3166 if (!source) {
3167 sync = MIRROR_SYNC_MODE_FULL;
3168 }
3169 }
3170 if (sync == MIRROR_SYNC_MODE_NONE) {
3171 source = bs;
3172 }
3173
3174 size = bdrv_getlength(bs);
3175 if (size < 0) {
3176 error_setg_errno(errp, -size, "bdrv_getlength failed");
3177 goto out;
3178 }
3179
3180 if (mode != NEW_IMAGE_MODE_EXISTING) {
3181 assert(format);
3182 if (source) {
3183 bdrv_img_create(target, format, source->filename,
3184 source->drv->format_name, NULL,
3185 size, flags, &local_err, false);
3186 } else {
3187 bdrv_img_create(target, format, NULL, NULL, NULL,
3188 size, flags, &local_err, false);
3189 }
3190 }
3191
3192 if (local_err) {
3193 error_propagate(errp, local_err);
3194 goto out;
3195 }
3196
3197 if (format) {
3198 options = qdict_new();
3199 qdict_put(options, "driver", qstring_from_str(format));
3200 }
3201
3202 target_bs = NULL;
3203 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
3204 if (ret < 0) {
3205 error_propagate(errp, local_err);
3206 goto out;
3207 }
3208
3209 bdrv_set_aio_context(target_bs, aio_context);
3210
3211 if (has_bitmap) {
3212 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
3213 if (!bmap) {
3214 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
3215 bdrv_unref(target_bs);
3216 goto out;
3217 }
3218 }
3219
3220 backup_start(bs, target_bs, speed, sync, bmap,
3221 on_source_error, on_target_error,
3222 block_job_cb, bs, txn, &local_err);
3223 if (local_err != NULL) {
3224 bdrv_unref(target_bs);
3225 error_propagate(errp, local_err);
3226 goto out;
3227 }
3228
3229 out:
3230 aio_context_release(aio_context);
3231 }
3232
3233 void qmp_drive_backup(const char *device, const char *target,
3234 bool has_format, const char *format,
3235 enum MirrorSyncMode sync,
3236 bool has_mode, enum NewImageMode mode,
3237 bool has_speed, int64_t speed,
3238 bool has_bitmap, const char *bitmap,
3239 bool has_on_source_error, BlockdevOnError on_source_error,
3240 bool has_on_target_error, BlockdevOnError on_target_error,
3241 Error **errp)
3242 {
3243 return do_drive_backup(device, target, has_format, format, sync,
3244 has_mode, mode, has_speed, speed,
3245 has_bitmap, bitmap,
3246 has_on_source_error, on_source_error,
3247 has_on_target_error, on_target_error,
3248 NULL, errp);
3249 }
3250
3251 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3252 {
3253 return bdrv_named_nodes_list(errp);
3254 }
3255
3256 void do_blockdev_backup(const char *device, const char *target,
3257 enum MirrorSyncMode sync,
3258 bool has_speed, int64_t speed,
3259 bool has_on_source_error,
3260 BlockdevOnError on_source_error,
3261 bool has_on_target_error,
3262 BlockdevOnError on_target_error,
3263 BlockJobTxn *txn, Error **errp)
3264 {
3265 BlockBackend *blk, *target_blk;
3266 BlockDriverState *bs;
3267 BlockDriverState *target_bs;
3268 Error *local_err = NULL;
3269 AioContext *aio_context;
3270
3271 if (!has_speed) {
3272 speed = 0;
3273 }
3274 if (!has_on_source_error) {
3275 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3276 }
3277 if (!has_on_target_error) {
3278 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3279 }
3280
3281 blk = blk_by_name(device);
3282 if (!blk) {
3283 error_setg(errp, "Device '%s' not found", device);
3284 return;
3285 }
3286
3287 aio_context = blk_get_aio_context(blk);
3288 aio_context_acquire(aio_context);
3289
3290 if (!blk_is_available(blk)) {
3291 error_setg(errp, "Device '%s' has no medium", device);
3292 goto out;
3293 }
3294 bs = blk_bs(blk);
3295
3296 target_blk = blk_by_name(target);
3297 if (!target_blk) {
3298 error_setg(errp, "Device '%s' not found", target);
3299 goto out;
3300 }
3301
3302 if (!blk_is_available(target_blk)) {
3303 error_setg(errp, "Device '%s' has no medium", target);
3304 goto out;
3305 }
3306 target_bs = blk_bs(target_blk);
3307
3308 bdrv_ref(target_bs);
3309 bdrv_set_aio_context(target_bs, aio_context);
3310 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
3311 on_target_error, block_job_cb, bs, txn, &local_err);
3312 if (local_err != NULL) {
3313 bdrv_unref(target_bs);
3314 error_propagate(errp, local_err);
3315 }
3316 out:
3317 aio_context_release(aio_context);
3318 }
3319
3320 void qmp_blockdev_backup(const char *device, const char *target,
3321 enum MirrorSyncMode sync,
3322 bool has_speed, int64_t speed,
3323 bool has_on_source_error,
3324 BlockdevOnError on_source_error,
3325 bool has_on_target_error,
3326 BlockdevOnError on_target_error,
3327 Error **errp)
3328 {
3329 do_blockdev_backup(device, target, sync, has_speed, speed,
3330 has_on_source_error, on_source_error,
3331 has_on_target_error, on_target_error,
3332 NULL, errp);
3333 }
3334
3335 /* Parameter check and block job starting for drive mirroring.
3336 * Caller should hold @device and @target's aio context (must be the same).
3337 **/
3338 static void blockdev_mirror_common(BlockDriverState *bs,
3339 BlockDriverState *target,
3340 bool has_replaces, const char *replaces,
3341 enum MirrorSyncMode sync,
3342 bool has_speed, int64_t speed,
3343 bool has_granularity, uint32_t granularity,
3344 bool has_buf_size, int64_t buf_size,
3345 bool has_on_source_error,
3346 BlockdevOnError on_source_error,
3347 bool has_on_target_error,
3348 BlockdevOnError on_target_error,
3349 bool has_unmap, bool unmap,
3350 Error **errp)
3351 {
3352
3353 if (!has_speed) {
3354 speed = 0;
3355 }
3356 if (!has_on_source_error) {
3357 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3358 }
3359 if (!has_on_target_error) {
3360 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3361 }
3362 if (!has_granularity) {
3363 granularity = 0;
3364 }
3365 if (!has_buf_size) {
3366 buf_size = 0;
3367 }
3368 if (!has_unmap) {
3369 unmap = true;
3370 }
3371
3372 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3373 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3374 "a value in range [512B, 64MB]");
3375 return;
3376 }
3377 if (granularity & (granularity - 1)) {
3378 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3379 "power of 2");
3380 return;
3381 }
3382
3383 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3384 return;
3385 }
3386 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3387 return;
3388 }
3389 if (target->blk) {
3390 error_setg(errp, "Cannot mirror to an attached block device");
3391 return;
3392 }
3393
3394 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3395 sync = MIRROR_SYNC_MODE_FULL;
3396 }
3397
3398 /* pass the node name to replace to mirror start since it's loose coupling
3399 * and will allow to check whether the node still exist at mirror completion
3400 */
3401 mirror_start(bs, target,
3402 has_replaces ? replaces : NULL,
3403 speed, granularity, buf_size, sync,
3404 on_source_error, on_target_error, unmap,
3405 block_job_cb, bs, errp);
3406 }
3407
3408 void qmp_drive_mirror(const char *device, const char *target,
3409 bool has_format, const char *format,
3410 bool has_node_name, const char *node_name,
3411 bool has_replaces, const char *replaces,
3412 enum MirrorSyncMode sync,
3413 bool has_mode, enum NewImageMode mode,
3414 bool has_speed, int64_t speed,
3415 bool has_granularity, uint32_t granularity,
3416 bool has_buf_size, int64_t buf_size,
3417 bool has_on_source_error, BlockdevOnError on_source_error,
3418 bool has_on_target_error, BlockdevOnError on_target_error,
3419 bool has_unmap, bool unmap,
3420 Error **errp)
3421 {
3422 BlockDriverState *bs;
3423 BlockBackend *blk;
3424 BlockDriverState *source, *target_bs;
3425 AioContext *aio_context;
3426 Error *local_err = NULL;
3427 QDict *options = NULL;
3428 int flags;
3429 int64_t size;
3430 int ret;
3431
3432 blk = blk_by_name(device);
3433 if (!blk) {
3434 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3435 "Device '%s' not found", device);
3436 return;
3437 }
3438
3439 aio_context = blk_get_aio_context(blk);
3440 aio_context_acquire(aio_context);
3441
3442 if (!blk_is_available(blk)) {
3443 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3444 goto out;
3445 }
3446 bs = blk_bs(blk);
3447 if (!has_mode) {
3448 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3449 }
3450
3451 if (!has_format) {
3452 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3453 }
3454
3455 flags = bs->open_flags | BDRV_O_RDWR;
3456 source = backing_bs(bs);
3457 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3458 sync = MIRROR_SYNC_MODE_FULL;
3459 }
3460 if (sync == MIRROR_SYNC_MODE_NONE) {
3461 source = bs;
3462 }
3463
3464 size = bdrv_getlength(bs);
3465 if (size < 0) {
3466 error_setg_errno(errp, -size, "bdrv_getlength failed");
3467 goto out;
3468 }
3469
3470 if (has_replaces) {
3471 BlockDriverState *to_replace_bs;
3472 AioContext *replace_aio_context;
3473 int64_t replace_size;
3474
3475 if (!has_node_name) {
3476 error_setg(errp, "a node-name must be provided when replacing a"
3477 " named node of the graph");
3478 goto out;
3479 }
3480
3481 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3482
3483 if (!to_replace_bs) {
3484 error_propagate(errp, local_err);
3485 goto out;
3486 }
3487
3488 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3489 aio_context_acquire(replace_aio_context);
3490 replace_size = bdrv_getlength(to_replace_bs);
3491 aio_context_release(replace_aio_context);
3492
3493 if (size != replace_size) {
3494 error_setg(errp, "cannot replace image with a mirror image of "
3495 "different size");
3496 goto out;
3497 }
3498 }
3499
3500 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3501 && mode != NEW_IMAGE_MODE_EXISTING)
3502 {
3503 /* create new image w/o backing file */
3504 assert(format);
3505 bdrv_img_create(target, format,
3506 NULL, NULL, NULL, size, flags, &local_err, false);
3507 } else {
3508 switch (mode) {
3509 case NEW_IMAGE_MODE_EXISTING:
3510 break;
3511 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3512 /* create new image with backing file */
3513 bdrv_img_create(target, format,
3514 source->filename,
3515 source->drv->format_name,
3516 NULL, size, flags, &local_err, false);
3517 break;
3518 default:
3519 abort();
3520 }
3521 }
3522
3523 if (local_err) {
3524 error_propagate(errp, local_err);
3525 goto out;
3526 }
3527
3528 options = qdict_new();
3529 if (has_node_name) {
3530 qdict_put(options, "node-name", qstring_from_str(node_name));
3531 }
3532 if (format) {
3533 qdict_put(options, "driver", qstring_from_str(format));
3534 }
3535
3536 /* Mirroring takes care of copy-on-write using the source's backing
3537 * file.
3538 */
3539 target_bs = NULL;
3540 ret = bdrv_open(&target_bs, target, NULL, options,
3541 flags | BDRV_O_NO_BACKING, &local_err);
3542 if (ret < 0) {
3543 error_propagate(errp, local_err);
3544 goto out;
3545 }
3546
3547 bdrv_set_aio_context(target_bs, aio_context);
3548
3549 blockdev_mirror_common(bs, target_bs,
3550 has_replaces, replaces, sync,
3551 has_speed, speed,
3552 has_granularity, granularity,
3553 has_buf_size, buf_size,
3554 has_on_source_error, on_source_error,
3555 has_on_target_error, on_target_error,
3556 has_unmap, unmap,
3557 &local_err);
3558 if (local_err) {
3559 error_propagate(errp, local_err);
3560 bdrv_unref(target_bs);
3561 }
3562 out:
3563 aio_context_release(aio_context);
3564 }
3565
3566 void qmp_blockdev_mirror(const char *device, const char *target,
3567 bool has_replaces, const char *replaces,
3568 MirrorSyncMode sync,
3569 bool has_speed, int64_t speed,
3570 bool has_granularity, uint32_t granularity,
3571 bool has_buf_size, int64_t buf_size,
3572 bool has_on_source_error,
3573 BlockdevOnError on_source_error,
3574 bool has_on_target_error,
3575 BlockdevOnError on_target_error,
3576 Error **errp)
3577 {
3578 BlockDriverState *bs;
3579 BlockBackend *blk;
3580 BlockDriverState *target_bs;
3581 AioContext *aio_context;
3582 Error *local_err = NULL;
3583
3584 blk = blk_by_name(device);
3585 if (!blk) {
3586 error_setg(errp, "Device '%s' not found", device);
3587 return;
3588 }
3589 bs = blk_bs(blk);
3590
3591 if (!bs) {
3592 error_setg(errp, "Device '%s' has no media", device);
3593 return;
3594 }
3595
3596 target_bs = bdrv_lookup_bs(target, target, errp);
3597 if (!target_bs) {
3598 return;
3599 }
3600
3601 aio_context = bdrv_get_aio_context(bs);
3602 aio_context_acquire(aio_context);
3603
3604 bdrv_ref(target_bs);
3605 bdrv_set_aio_context(target_bs, aio_context);
3606
3607 blockdev_mirror_common(bs, target_bs,
3608 has_replaces, replaces, sync,
3609 has_speed, speed,
3610 has_granularity, granularity,
3611 has_buf_size, buf_size,
3612 has_on_source_error, on_source_error,
3613 has_on_target_error, on_target_error,
3614 true, true,
3615 &local_err);
3616 if (local_err) {
3617 error_propagate(errp, local_err);
3618 bdrv_unref(target_bs);
3619 }
3620
3621 aio_context_release(aio_context);
3622 }
3623
3624 /* Get the block job for a given device name and acquire its AioContext */
3625 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3626 Error **errp)
3627 {
3628 BlockBackend *blk;
3629 BlockDriverState *bs;
3630
3631 *aio_context = NULL;
3632
3633 blk = blk_by_name(device);
3634 if (!blk) {
3635 goto notfound;
3636 }
3637
3638 *aio_context = blk_get_aio_context(blk);
3639 aio_context_acquire(*aio_context);
3640
3641 if (!blk_is_available(blk)) {
3642 goto notfound;
3643 }
3644 bs = blk_bs(blk);
3645
3646 if (!bs->job) {
3647 goto notfound;
3648 }
3649
3650 return bs->job;
3651
3652 notfound:
3653 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3654 "No active block job on device '%s'", device);
3655 if (*aio_context) {
3656 aio_context_release(*aio_context);
3657 *aio_context = NULL;
3658 }
3659 return NULL;
3660 }
3661
3662 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3663 {
3664 AioContext *aio_context;
3665 BlockJob *job = find_block_job(device, &aio_context, errp);
3666
3667 if (!job) {
3668 return;
3669 }
3670
3671 block_job_set_speed(job, speed, errp);
3672 aio_context_release(aio_context);
3673 }
3674
3675 void qmp_block_job_cancel(const char *device,
3676 bool has_force, bool force, Error **errp)
3677 {
3678 AioContext *aio_context;
3679 BlockJob *job = find_block_job(device, &aio_context, errp);
3680
3681 if (!job) {
3682 return;
3683 }
3684
3685 if (!has_force) {
3686 force = false;
3687 }
3688
3689 if (job->user_paused && !force) {
3690 error_setg(errp, "The block job for device '%s' is currently paused",
3691 device);
3692 goto out;
3693 }
3694
3695 trace_qmp_block_job_cancel(job);
3696 block_job_cancel(job);
3697 out:
3698 aio_context_release(aio_context);
3699 }
3700
3701 void qmp_block_job_pause(const char *device, Error **errp)
3702 {
3703 AioContext *aio_context;
3704 BlockJob *job = find_block_job(device, &aio_context, errp);
3705
3706 if (!job || job->user_paused) {
3707 return;
3708 }
3709
3710 job->user_paused = true;
3711 trace_qmp_block_job_pause(job);
3712 block_job_pause(job);
3713 aio_context_release(aio_context);
3714 }
3715
3716 void qmp_block_job_resume(const char *device, Error **errp)
3717 {
3718 AioContext *aio_context;
3719 BlockJob *job = find_block_job(device, &aio_context, errp);
3720
3721 if (!job || !job->user_paused) {
3722 return;
3723 }
3724
3725 job->user_paused = false;
3726 trace_qmp_block_job_resume(job);
3727 block_job_resume(job);
3728 aio_context_release(aio_context);
3729 }
3730
3731 void qmp_block_job_complete(const char *device, Error **errp)
3732 {
3733 AioContext *aio_context;
3734 BlockJob *job = find_block_job(device, &aio_context, errp);
3735
3736 if (!job) {
3737 return;
3738 }
3739
3740 trace_qmp_block_job_complete(job);
3741 block_job_complete(job, errp);
3742 aio_context_release(aio_context);
3743 }
3744
3745 void qmp_change_backing_file(const char *device,
3746 const char *image_node_name,
3747 const char *backing_file,
3748 Error **errp)
3749 {
3750 BlockBackend *blk;
3751 BlockDriverState *bs = NULL;
3752 AioContext *aio_context;
3753 BlockDriverState *image_bs = NULL;
3754 Error *local_err = NULL;
3755 bool ro;
3756 int open_flags;
3757 int ret;
3758
3759 blk = blk_by_name(device);
3760 if (!blk) {
3761 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3762 "Device '%s' not found", device);
3763 return;
3764 }
3765
3766 aio_context = blk_get_aio_context(blk);
3767 aio_context_acquire(aio_context);
3768
3769 if (!blk_is_available(blk)) {
3770 error_setg(errp, "Device '%s' has no medium", device);
3771 goto out;
3772 }
3773 bs = blk_bs(blk);
3774
3775 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3776 if (local_err) {
3777 error_propagate(errp, local_err);
3778 goto out;
3779 }
3780
3781 if (!image_bs) {
3782 error_setg(errp, "image file not found");
3783 goto out;
3784 }
3785
3786 if (bdrv_find_base(image_bs) == image_bs) {
3787 error_setg(errp, "not allowing backing file change on an image "
3788 "without a backing file");
3789 goto out;
3790 }
3791
3792 /* even though we are not necessarily operating on bs, we need it to
3793 * determine if block ops are currently prohibited on the chain */
3794 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3795 goto out;
3796 }
3797
3798 /* final sanity check */
3799 if (!bdrv_chain_contains(bs, image_bs)) {
3800 error_setg(errp, "'%s' and image file are not in the same chain",
3801 device);
3802 goto out;
3803 }
3804
3805 /* if not r/w, reopen to make r/w */
3806 open_flags = image_bs->open_flags;
3807 ro = bdrv_is_read_only(image_bs);
3808
3809 if (ro) {
3810 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3811 if (local_err) {
3812 error_propagate(errp, local_err);
3813 goto out;
3814 }
3815 }
3816
3817 ret = bdrv_change_backing_file(image_bs, backing_file,
3818 image_bs->drv ? image_bs->drv->format_name : "");
3819
3820 if (ret < 0) {
3821 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3822 backing_file);
3823 /* don't exit here, so we can try to restore open flags if
3824 * appropriate */
3825 }
3826
3827 if (ro) {
3828 bdrv_reopen(image_bs, open_flags, &local_err);
3829 if (local_err) {
3830 error_propagate(errp, local_err); /* will preserve prior errp */
3831 }
3832 }
3833
3834 out:
3835 aio_context_release(aio_context);
3836 }
3837
3838 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3839 {
3840 QmpOutputVisitor *ov = qmp_output_visitor_new();
3841 BlockDriverState *bs;
3842 BlockBackend *blk = NULL;
3843 QObject *obj;
3844 QDict *qdict;
3845 Error *local_err = NULL;
3846
3847 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3848 * cache.direct=false instead of silently switching to aio=threads, except
3849 * when called from drive_new().
3850 *
3851 * For now, simply forbidding the combination for all drivers will do. */
3852 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3853 bool direct = options->has_cache &&
3854 options->cache->has_direct &&
3855 options->cache->direct;
3856 if (!direct) {
3857 error_setg(errp, "aio=native requires cache.direct=true");
3858 goto fail;
3859 }
3860 }
3861
3862 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3863 &options, NULL, &local_err);
3864 if (local_err) {
3865 error_propagate(errp, local_err);
3866 goto fail;
3867 }
3868
3869 obj = qmp_output_get_qobject(ov);
3870 qdict = qobject_to_qdict(obj);
3871
3872 qdict_flatten(qdict);
3873
3874 if (options->has_id) {
3875 blk = blockdev_init(NULL, qdict, &local_err);
3876 if (local_err) {
3877 error_propagate(errp, local_err);
3878 goto fail;
3879 }
3880
3881 bs = blk_bs(blk);
3882 } else {
3883 if (!qdict_get_try_str(qdict, "node-name")) {
3884 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3885 "the root node");
3886 goto fail;
3887 }
3888
3889 bs = bds_tree_init(qdict, errp);
3890 if (!bs) {
3891 goto fail;
3892 }
3893
3894 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3895 }
3896
3897 if (bs && bdrv_key_required(bs)) {
3898 if (blk) {
3899 blk_unref(blk);
3900 } else {
3901 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3902 bdrv_unref(bs);
3903 }
3904 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3905 goto fail;
3906 }
3907
3908 fail:
3909 qmp_output_visitor_cleanup(ov);
3910 }
3911
3912 void qmp_x_blockdev_del(bool has_id, const char *id,
3913 bool has_node_name, const char *node_name, Error **errp)
3914 {
3915 AioContext *aio_context;
3916 BlockBackend *blk;
3917 BlockDriverState *bs;
3918
3919 if (has_id && has_node_name) {
3920 error_setg(errp, "Only one of id and node-name must be specified");
3921 return;
3922 } else if (!has_id && !has_node_name) {
3923 error_setg(errp, "No block device specified");
3924 return;
3925 }
3926
3927 if (has_id) {
3928 blk = blk_by_name(id);
3929 if (!blk) {
3930 error_setg(errp, "Cannot find block backend %s", id);
3931 return;
3932 }
3933 if (blk_get_refcnt(blk) > 1) {
3934 error_setg(errp, "Block backend %s is in use", id);
3935 return;
3936 }
3937 bs = blk_bs(blk);
3938 aio_context = blk_get_aio_context(blk);
3939 } else {
3940 bs = bdrv_find_node(node_name);
3941 if (!bs) {
3942 error_setg(errp, "Cannot find node %s", node_name);
3943 return;
3944 }
3945 blk = bs->blk;
3946 if (blk) {
3947 error_setg(errp, "Node %s is in use by %s",
3948 node_name, blk_name(blk));
3949 return;
3950 }
3951 aio_context = bdrv_get_aio_context(bs);
3952 }
3953
3954 aio_context_acquire(aio_context);
3955
3956 if (bs) {
3957 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3958 goto out;
3959 }
3960
3961 if (!blk && !bs->monitor_list.tqe_prev) {
3962 error_setg(errp, "Node %s is not owned by the monitor",
3963 bs->node_name);
3964 goto out;
3965 }
3966
3967 if (bs->refcnt > 1) {
3968 error_setg(errp, "Block device %s is in use",
3969 bdrv_get_device_or_node_name(bs));
3970 goto out;
3971 }
3972 }
3973
3974 if (blk) {
3975 blk_unref(blk);
3976 } else {
3977 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3978 bdrv_unref(bs);
3979 }
3980
3981 out:
3982 aio_context_release(aio_context);
3983 }
3984
3985 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3986 {
3987 BlockJobInfoList *head = NULL, **p_next = &head;
3988 BlockDriverState *bs;
3989
3990 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3991 AioContext *aio_context = bdrv_get_aio_context(bs);
3992
3993 aio_context_acquire(aio_context);
3994
3995 if (bs->job) {
3996 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3997 elem->value = block_job_query(bs->job);
3998 *p_next = elem;
3999 p_next = &elem->next;
4000 }
4001
4002 aio_context_release(aio_context);
4003 }
4004
4005 return head;
4006 }
4007
4008 QemuOptsList qemu_common_drive_opts = {
4009 .name = "drive",
4010 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4011 .desc = {
4012 {
4013 .name = "snapshot",
4014 .type = QEMU_OPT_BOOL,
4015 .help = "enable/disable snapshot mode",
4016 },{
4017 .name = "discard",
4018 .type = QEMU_OPT_STRING,
4019 .help = "discard operation (ignore/off, unmap/on)",
4020 },{
4021 .name = "aio",
4022 .type = QEMU_OPT_STRING,
4023 .help = "host AIO implementation (threads, native)",
4024 },{
4025 .name = "format",
4026 .type = QEMU_OPT_STRING,
4027 .help = "disk format (raw, qcow2, ...)",
4028 },{
4029 .name = "rerror",
4030 .type = QEMU_OPT_STRING,
4031 .help = "read error action",
4032 },{
4033 .name = "werror",
4034 .type = QEMU_OPT_STRING,
4035 .help = "write error action",
4036 },{
4037 .name = "read-only",
4038 .type = QEMU_OPT_BOOL,
4039 .help = "open drive file as read-only",
4040 },{
4041 .name = "throttling.iops-total",
4042 .type = QEMU_OPT_NUMBER,
4043 .help = "limit total I/O operations per second",
4044 },{
4045 .name = "throttling.iops-read",
4046 .type = QEMU_OPT_NUMBER,
4047 .help = "limit read operations per second",
4048 },{
4049 .name = "throttling.iops-write",
4050 .type = QEMU_OPT_NUMBER,
4051 .help = "limit write operations per second",
4052 },{
4053 .name = "throttling.bps-total",
4054 .type = QEMU_OPT_NUMBER,
4055 .help = "limit total bytes per second",
4056 },{
4057 .name = "throttling.bps-read",
4058 .type = QEMU_OPT_NUMBER,
4059 .help = "limit read bytes per second",
4060 },{
4061 .name = "throttling.bps-write",
4062 .type = QEMU_OPT_NUMBER,
4063 .help = "limit write bytes per second",
4064 },{
4065 .name = "throttling.iops-total-max",
4066 .type = QEMU_OPT_NUMBER,
4067 .help = "I/O operations burst",
4068 },{
4069 .name = "throttling.iops-read-max",
4070 .type = QEMU_OPT_NUMBER,
4071 .help = "I/O operations read burst",
4072 },{
4073 .name = "throttling.iops-write-max",
4074 .type = QEMU_OPT_NUMBER,
4075 .help = "I/O operations write burst",
4076 },{
4077 .name = "throttling.bps-total-max",
4078 .type = QEMU_OPT_NUMBER,
4079 .help = "total bytes burst",
4080 },{
4081 .name = "throttling.bps-read-max",
4082 .type = QEMU_OPT_NUMBER,
4083 .help = "total bytes read burst",
4084 },{
4085 .name = "throttling.bps-write-max",
4086 .type = QEMU_OPT_NUMBER,
4087 .help = "total bytes write burst",
4088 },{
4089 .name = "throttling.iops-size",
4090 .type = QEMU_OPT_NUMBER,
4091 .help = "when limiting by iops max size of an I/O in bytes",
4092 },{
4093 .name = "throttling.group",
4094 .type = QEMU_OPT_STRING,
4095 .help = "name of the block throttling group",
4096 },{
4097 .name = "copy-on-read",
4098 .type = QEMU_OPT_BOOL,
4099 .help = "copy read data from backing file into image file",
4100 },{
4101 .name = "detect-zeroes",
4102 .type = QEMU_OPT_STRING,
4103 .help = "try to optimize zero writes (off, on, unmap)",
4104 },{
4105 .name = "stats-account-invalid",
4106 .type = QEMU_OPT_BOOL,
4107 .help = "whether to account for invalid I/O operations "
4108 "in the statistics",
4109 },{
4110 .name = "stats-account-failed",
4111 .type = QEMU_OPT_BOOL,
4112 .help = "whether to account for failed I/O operations "
4113 "in the statistics",
4114 },
4115 { /* end of list */ }
4116 },
4117 };
4118
4119 static QemuOptsList qemu_root_bds_opts = {
4120 .name = "root-bds",
4121 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4122 .desc = {
4123 {
4124 .name = "discard",
4125 .type = QEMU_OPT_STRING,
4126 .help = "discard operation (ignore/off, unmap/on)",
4127 },{
4128 .name = "aio",
4129 .type = QEMU_OPT_STRING,
4130 .help = "host AIO implementation (threads, native)",
4131 },{
4132 .name = "read-only",
4133 .type = QEMU_OPT_BOOL,
4134 .help = "open drive file as read-only",
4135 },{
4136 .name = "copy-on-read",
4137 .type = QEMU_OPT_BOOL,
4138 .help = "copy read data from backing file into image file",
4139 },{
4140 .name = "detect-zeroes",
4141 .type = QEMU_OPT_STRING,
4142 .help = "try to optimize zero writes (off, on, unmap)",
4143 },
4144 { /* end of list */ }
4145 },
4146 };
4147
4148 QemuOptsList qemu_drive_opts = {
4149 .name = "drive",
4150 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4151 .desc = {
4152 /*
4153 * no elements => accept any params
4154 * validation will happen later
4155 */
4156 { /* end of list */ }
4157 },
4158 };
QEmu