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block: Fix snapshot=on cache modes
[mirror_qemu.git] / blockdev.c
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "qemu/osdep.h"
34 #include "sysemu/block-backend.h"
35 #include "sysemu/blockdev.h"
36 #include "hw/block/block.h"
37 #include "block/blockjob.h"
38 #include "block/throttle-groups.h"
39 #include "monitor/monitor.h"
40 #include "qemu/error-report.h"
41 #include "qemu/option.h"
42 #include "qemu/config-file.h"
43 #include "qapi/qmp/types.h"
44 #include "qapi-visit.h"
45 #include "qapi/qmp/qerror.h"
46 #include "qapi/qmp-output-visitor.h"
47 #include "qapi/util.h"
48 #include "sysemu/sysemu.h"
49 #include "block/block_int.h"
50 #include "qmp-commands.h"
51 #include "trace.h"
52 #include "sysemu/arch_init.h"
53
54 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
55 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
56
57 static const char *const if_name[IF_COUNT] = {
58 [IF_NONE] = "none",
59 [IF_IDE] = "ide",
60 [IF_SCSI] = "scsi",
61 [IF_FLOPPY] = "floppy",
62 [IF_PFLASH] = "pflash",
63 [IF_MTD] = "mtd",
64 [IF_SD] = "sd",
65 [IF_VIRTIO] = "virtio",
66 [IF_XEN] = "xen",
67 };
68
69 static int if_max_devs[IF_COUNT] = {
70 /*
71 * Do not change these numbers! They govern how drive option
72 * index maps to unit and bus. That mapping is ABI.
73 *
74 * All controllers used to imlement if=T drives need to support
75 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
76 * Otherwise, some index values map to "impossible" bus, unit
77 * values.
78 *
79 * For instance, if you change [IF_SCSI] to 255, -drive
80 * if=scsi,index=12 no longer means bus=1,unit=5, but
81 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
82 * the drive can't be set up. Regression.
83 */
84 [IF_IDE] = 2,
85 [IF_SCSI] = 7,
86 };
87
88 /**
89 * Boards may call this to offer board-by-board overrides
90 * of the default, global values.
91 */
92 void override_max_devs(BlockInterfaceType type, int max_devs)
93 {
94 BlockBackend *blk;
95 DriveInfo *dinfo;
96
97 if (max_devs <= 0) {
98 return;
99 }
100
101 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
102 dinfo = blk_legacy_dinfo(blk);
103 if (dinfo->type == type) {
104 fprintf(stderr, "Cannot override units-per-bus property of"
105 " the %s interface, because a drive of that type has"
106 " already been added.\n", if_name[type]);
107 g_assert_not_reached();
108 }
109 }
110
111 if_max_devs[type] = max_devs;
112 }
113
114 /*
115 * We automatically delete the drive when a device using it gets
116 * unplugged. Questionable feature, but we can't just drop it.
117 * Device models call blockdev_mark_auto_del() to schedule the
118 * automatic deletion, and generic qdev code calls blockdev_auto_del()
119 * when deletion is actually safe.
120 */
121 void blockdev_mark_auto_del(BlockBackend *blk)
122 {
123 DriveInfo *dinfo = blk_legacy_dinfo(blk);
124 BlockDriverState *bs = blk_bs(blk);
125 AioContext *aio_context;
126
127 if (!dinfo) {
128 return;
129 }
130
131 if (bs) {
132 aio_context = bdrv_get_aio_context(bs);
133 aio_context_acquire(aio_context);
134
135 if (bs->job) {
136 block_job_cancel(bs->job);
137 }
138
139 aio_context_release(aio_context);
140 }
141
142 dinfo->auto_del = 1;
143 }
144
145 void blockdev_auto_del(BlockBackend *blk)
146 {
147 DriveInfo *dinfo = blk_legacy_dinfo(blk);
148
149 if (dinfo && dinfo->auto_del) {
150 blk_unref(blk);
151 }
152 }
153
154 /**
155 * Returns the current mapping of how many units per bus
156 * a particular interface can support.
157 *
158 * A positive integer indicates n units per bus.
159 * 0 implies the mapping has not been established.
160 * -1 indicates an invalid BlockInterfaceType was given.
161 */
162 int drive_get_max_devs(BlockInterfaceType type)
163 {
164 if (type >= IF_IDE && type < IF_COUNT) {
165 return if_max_devs[type];
166 }
167
168 return -1;
169 }
170
171 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
172 {
173 int max_devs = if_max_devs[type];
174 return max_devs ? index / max_devs : 0;
175 }
176
177 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
178 {
179 int max_devs = if_max_devs[type];
180 return max_devs ? index % max_devs : index;
181 }
182
183 QemuOpts *drive_def(const char *optstr)
184 {
185 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
186 }
187
188 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
189 const char *optstr)
190 {
191 QemuOpts *opts;
192
193 opts = drive_def(optstr);
194 if (!opts) {
195 return NULL;
196 }
197 if (type != IF_DEFAULT) {
198 qemu_opt_set(opts, "if", if_name[type], &error_abort);
199 }
200 if (index >= 0) {
201 qemu_opt_set_number(opts, "index", index, &error_abort);
202 }
203 if (file)
204 qemu_opt_set(opts, "file", file, &error_abort);
205 return opts;
206 }
207
208 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
209 {
210 BlockBackend *blk;
211 DriveInfo *dinfo;
212
213 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
214 dinfo = blk_legacy_dinfo(blk);
215 if (dinfo && dinfo->type == type
216 && dinfo->bus == bus && dinfo->unit == unit) {
217 return dinfo;
218 }
219 }
220
221 return NULL;
222 }
223
224 bool drive_check_orphaned(void)
225 {
226 BlockBackend *blk;
227 DriveInfo *dinfo;
228 bool rs = false;
229
230 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
231 dinfo = blk_legacy_dinfo(blk);
232 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
233 /* Unless this is a default drive, this may be an oversight. */
234 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
235 dinfo->type != IF_NONE) {
236 fprintf(stderr, "Warning: Orphaned drive without device: "
237 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
238 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
239 if_name[dinfo->type], dinfo->bus, dinfo->unit);
240 rs = true;
241 }
242 }
243
244 return rs;
245 }
246
247 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
248 {
249 return drive_get(type,
250 drive_index_to_bus_id(type, index),
251 drive_index_to_unit_id(type, index));
252 }
253
254 int drive_get_max_bus(BlockInterfaceType type)
255 {
256 int max_bus;
257 BlockBackend *blk;
258 DriveInfo *dinfo;
259
260 max_bus = -1;
261 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
262 dinfo = blk_legacy_dinfo(blk);
263 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
264 max_bus = dinfo->bus;
265 }
266 }
267 return max_bus;
268 }
269
270 /* Get a block device. This should only be used for single-drive devices
271 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
272 appropriate bus. */
273 DriveInfo *drive_get_next(BlockInterfaceType type)
274 {
275 static int next_block_unit[IF_COUNT];
276
277 return drive_get(type, 0, next_block_unit[type]++);
278 }
279
280 static void bdrv_format_print(void *opaque, const char *name)
281 {
282 error_printf(" %s", name);
283 }
284
285 typedef struct {
286 QEMUBH *bh;
287 BlockDriverState *bs;
288 } BDRVPutRefBH;
289
290 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
291 {
292 if (!strcmp(buf, "ignore")) {
293 return BLOCKDEV_ON_ERROR_IGNORE;
294 } else if (!is_read && !strcmp(buf, "enospc")) {
295 return BLOCKDEV_ON_ERROR_ENOSPC;
296 } else if (!strcmp(buf, "stop")) {
297 return BLOCKDEV_ON_ERROR_STOP;
298 } else if (!strcmp(buf, "report")) {
299 return BLOCKDEV_ON_ERROR_REPORT;
300 } else {
301 error_setg(errp, "'%s' invalid %s error action",
302 buf, is_read ? "read" : "write");
303 return -1;
304 }
305 }
306
307 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
308 Error **errp)
309 {
310 const QListEntry *entry;
311 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
312 switch (qobject_type(entry->value)) {
313
314 case QTYPE_QSTRING: {
315 unsigned long long length;
316 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
317 if (parse_uint_full(str, &length, 10) == 0 &&
318 length > 0 && length <= UINT_MAX) {
319 block_acct_add_interval(stats, (unsigned) length);
320 } else {
321 error_setg(errp, "Invalid interval length: %s", str);
322 return false;
323 }
324 break;
325 }
326
327 case QTYPE_QINT: {
328 int64_t length = qint_get_int(qobject_to_qint(entry->value));
329 if (length > 0 && length <= UINT_MAX) {
330 block_acct_add_interval(stats, (unsigned) length);
331 } else {
332 error_setg(errp, "Invalid interval length: %" PRId64, length);
333 return false;
334 }
335 break;
336 }
337
338 default:
339 error_setg(errp, "The specification of stats-intervals is invalid");
340 return false;
341 }
342 }
343 return true;
344 }
345
346 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
347
348 /* All parameters but @opts are optional and may be set to NULL. */
349 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
350 const char **throttling_group, ThrottleConfig *throttle_cfg,
351 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
352 {
353 const char *discard;
354 Error *local_error = NULL;
355 const char *aio;
356
357 if (bdrv_flags) {
358 if (!qemu_opt_get_bool(opts, "read-only", false)) {
359 *bdrv_flags |= BDRV_O_RDWR;
360 }
361 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
362 *bdrv_flags |= BDRV_O_COPY_ON_READ;
363 }
364
365 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
366 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
367 error_setg(errp, "Invalid discard option");
368 return;
369 }
370 }
371
372 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
373 if (!strcmp(aio, "native")) {
374 *bdrv_flags |= BDRV_O_NATIVE_AIO;
375 } else if (!strcmp(aio, "threads")) {
376 /* this is the default */
377 } else {
378 error_setg(errp, "invalid aio option");
379 return;
380 }
381 }
382 }
383
384 /* disk I/O throttling */
385 if (throttling_group) {
386 *throttling_group = qemu_opt_get(opts, "throttling.group");
387 }
388
389 if (throttle_cfg) {
390 throttle_config_init(throttle_cfg);
391 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
392 qemu_opt_get_number(opts, "throttling.bps-total", 0);
393 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
394 qemu_opt_get_number(opts, "throttling.bps-read", 0);
395 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
396 qemu_opt_get_number(opts, "throttling.bps-write", 0);
397 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
398 qemu_opt_get_number(opts, "throttling.iops-total", 0);
399 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
400 qemu_opt_get_number(opts, "throttling.iops-read", 0);
401 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
402 qemu_opt_get_number(opts, "throttling.iops-write", 0);
403
404 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
405 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
406 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
407 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
408 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
409 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
410 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
411 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
412 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
413 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
414 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
415 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
416
417 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
418 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
419 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
420 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
421 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
422 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
423 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
424 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
425 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
426 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
427 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
428 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
429
430 throttle_cfg->op_size =
431 qemu_opt_get_number(opts, "throttling.iops-size", 0);
432
433 if (!throttle_is_valid(throttle_cfg, errp)) {
434 return;
435 }
436 }
437
438 if (detect_zeroes) {
439 *detect_zeroes =
440 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
441 qemu_opt_get(opts, "detect-zeroes"),
442 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
443 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
444 &local_error);
445 if (local_error) {
446 error_propagate(errp, local_error);
447 return;
448 }
449
450 if (bdrv_flags &&
451 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
452 !(*bdrv_flags & BDRV_O_UNMAP))
453 {
454 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
455 "without setting discard operation to unmap");
456 return;
457 }
458 }
459 }
460
461 /* Takes the ownership of bs_opts */
462 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
463 Error **errp)
464 {
465 const char *buf;
466 int bdrv_flags = 0;
467 int on_read_error, on_write_error;
468 bool account_invalid, account_failed;
469 BlockBackend *blk;
470 BlockDriverState *bs;
471 ThrottleConfig cfg;
472 int snapshot = 0;
473 Error *error = NULL;
474 QemuOpts *opts;
475 QDict *interval_dict = NULL;
476 QList *interval_list = NULL;
477 const char *id;
478 BlockdevDetectZeroesOptions detect_zeroes =
479 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
480 const char *throttling_group = NULL;
481
482 /* Check common options by copying from bs_opts to opts, all other options
483 * stay in bs_opts for processing by bdrv_open(). */
484 id = qdict_get_try_str(bs_opts, "id");
485 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
486 if (error) {
487 error_propagate(errp, error);
488 goto err_no_opts;
489 }
490
491 qemu_opts_absorb_qdict(opts, bs_opts, &error);
492 if (error) {
493 error_propagate(errp, error);
494 goto early_err;
495 }
496
497 if (id) {
498 qdict_del(bs_opts, "id");
499 }
500
501 /* extract parameters */
502 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
503
504 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
505 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
506
507 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
508 qdict_array_split(interval_dict, &interval_list);
509
510 if (qdict_size(interval_dict) != 0) {
511 error_setg(errp, "Invalid option stats-intervals.%s",
512 qdict_first(interval_dict)->key);
513 goto early_err;
514 }
515
516 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
517 &detect_zeroes, &error);
518 if (error) {
519 error_propagate(errp, error);
520 goto early_err;
521 }
522
523 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
524 if (is_help_option(buf)) {
525 error_printf("Supported formats:");
526 bdrv_iterate_format(bdrv_format_print, NULL);
527 error_printf("\n");
528 goto early_err;
529 }
530
531 if (qdict_haskey(bs_opts, "driver")) {
532 error_setg(errp, "Cannot specify both 'driver' and 'format'");
533 goto early_err;
534 }
535 qdict_put(bs_opts, "driver", qstring_from_str(buf));
536 }
537
538 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
539 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
540 on_write_error = parse_block_error_action(buf, 0, &error);
541 if (error) {
542 error_propagate(errp, error);
543 goto early_err;
544 }
545 }
546
547 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
548 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
549 on_read_error = parse_block_error_action(buf, 1, &error);
550 if (error) {
551 error_propagate(errp, error);
552 goto early_err;
553 }
554 }
555
556 if (snapshot) {
557 bdrv_flags |= BDRV_O_SNAPSHOT;
558 }
559
560 /* init */
561 if ((!file || !*file) && !qdict_size(bs_opts)) {
562 BlockBackendRootState *blk_rs;
563
564 blk = blk_new(qemu_opts_id(opts), errp);
565 if (!blk) {
566 goto early_err;
567 }
568
569 blk_rs = blk_get_root_state(blk);
570 blk_rs->open_flags = bdrv_flags;
571 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
572 blk_rs->detect_zeroes = detect_zeroes;
573
574 if (throttle_enabled(&cfg)) {
575 if (!throttling_group) {
576 throttling_group = blk_name(blk);
577 }
578 blk_rs->throttle_group = g_strdup(throttling_group);
579 blk_rs->throttle_state = throttle_group_incref(throttling_group);
580 blk_rs->throttle_state->cfg = cfg;
581 }
582
583 QDECREF(bs_opts);
584 } else {
585 if (file && !*file) {
586 file = NULL;
587 }
588
589 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
590 * with other callers) rather than what we want as the real defaults.
591 * Apply the defaults here instead. */
592 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
593 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
594 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
595
596 if (runstate_check(RUN_STATE_INMIGRATE)) {
597 bdrv_flags |= BDRV_O_INACTIVE;
598 }
599
600 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
601 errp);
602 if (!blk) {
603 goto err_no_bs_opts;
604 }
605 bs = blk_bs(blk);
606
607 bs->detect_zeroes = detect_zeroes;
608
609 /* disk I/O throttling */
610 if (throttle_enabled(&cfg)) {
611 if (!throttling_group) {
612 throttling_group = blk_name(blk);
613 }
614 bdrv_io_limits_enable(bs, throttling_group);
615 bdrv_set_io_limits(bs, &cfg);
616 }
617
618 if (bdrv_key_required(bs)) {
619 autostart = 0;
620 }
621
622 block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
623
624 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
625 blk_unref(blk);
626 blk = NULL;
627 goto err_no_bs_opts;
628 }
629 }
630
631 blk_set_on_error(blk, on_read_error, on_write_error);
632
633 err_no_bs_opts:
634 qemu_opts_del(opts);
635 QDECREF(interval_dict);
636 QDECREF(interval_list);
637 return blk;
638
639 early_err:
640 qemu_opts_del(opts);
641 QDECREF(interval_dict);
642 QDECREF(interval_list);
643 err_no_opts:
644 QDECREF(bs_opts);
645 return NULL;
646 }
647
648 static QemuOptsList qemu_root_bds_opts;
649
650 /* Takes the ownership of bs_opts */
651 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
652 {
653 BlockDriverState *bs;
654 QemuOpts *opts;
655 Error *local_error = NULL;
656 BlockdevDetectZeroesOptions detect_zeroes;
657 int ret;
658 int bdrv_flags = 0;
659
660 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
661 if (!opts) {
662 goto fail;
663 }
664
665 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
666 if (local_error) {
667 error_propagate(errp, local_error);
668 goto fail;
669 }
670
671 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
672 &detect_zeroes, &local_error);
673 if (local_error) {
674 error_propagate(errp, local_error);
675 goto fail;
676 }
677
678 if (runstate_check(RUN_STATE_INMIGRATE)) {
679 bdrv_flags |= BDRV_O_INACTIVE;
680 }
681
682 bs = NULL;
683 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
684 if (ret < 0) {
685 goto fail_no_bs_opts;
686 }
687
688 bs->detect_zeroes = detect_zeroes;
689
690 fail_no_bs_opts:
691 qemu_opts_del(opts);
692 return bs;
693
694 fail:
695 qemu_opts_del(opts);
696 QDECREF(bs_opts);
697 return NULL;
698 }
699
700 void blockdev_close_all_bdrv_states(void)
701 {
702 BlockDriverState *bs, *next_bs;
703
704 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
705 AioContext *ctx = bdrv_get_aio_context(bs);
706
707 aio_context_acquire(ctx);
708 bdrv_unref(bs);
709 aio_context_release(ctx);
710 }
711 }
712
713 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
714 Error **errp)
715 {
716 const char *value;
717
718 value = qemu_opt_get(opts, from);
719 if (value) {
720 if (qemu_opt_find(opts, to)) {
721 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
722 "same time", to, from);
723 return;
724 }
725 }
726
727 /* rename all items in opts */
728 while ((value = qemu_opt_get(opts, from))) {
729 qemu_opt_set(opts, to, value, &error_abort);
730 qemu_opt_unset(opts, from);
731 }
732 }
733
734 QemuOptsList qemu_legacy_drive_opts = {
735 .name = "drive",
736 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
737 .desc = {
738 {
739 .name = "bus",
740 .type = QEMU_OPT_NUMBER,
741 .help = "bus number",
742 },{
743 .name = "unit",
744 .type = QEMU_OPT_NUMBER,
745 .help = "unit number (i.e. lun for scsi)",
746 },{
747 .name = "index",
748 .type = QEMU_OPT_NUMBER,
749 .help = "index number",
750 },{
751 .name = "media",
752 .type = QEMU_OPT_STRING,
753 .help = "media type (disk, cdrom)",
754 },{
755 .name = "if",
756 .type = QEMU_OPT_STRING,
757 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
758 },{
759 .name = "cyls",
760 .type = QEMU_OPT_NUMBER,
761 .help = "number of cylinders (ide disk geometry)",
762 },{
763 .name = "heads",
764 .type = QEMU_OPT_NUMBER,
765 .help = "number of heads (ide disk geometry)",
766 },{
767 .name = "secs",
768 .type = QEMU_OPT_NUMBER,
769 .help = "number of sectors (ide disk geometry)",
770 },{
771 .name = "trans",
772 .type = QEMU_OPT_STRING,
773 .help = "chs translation (auto, lba, none)",
774 },{
775 .name = "boot",
776 .type = QEMU_OPT_BOOL,
777 .help = "(deprecated, ignored)",
778 },{
779 .name = "addr",
780 .type = QEMU_OPT_STRING,
781 .help = "pci address (virtio only)",
782 },{
783 .name = "serial",
784 .type = QEMU_OPT_STRING,
785 .help = "disk serial number",
786 },{
787 .name = "file",
788 .type = QEMU_OPT_STRING,
789 .help = "file name",
790 },
791
792 /* Options that are passed on, but have special semantics with -drive */
793 {
794 .name = "read-only",
795 .type = QEMU_OPT_BOOL,
796 .help = "open drive file as read-only",
797 },{
798 .name = "rerror",
799 .type = QEMU_OPT_STRING,
800 .help = "read error action",
801 },{
802 .name = "werror",
803 .type = QEMU_OPT_STRING,
804 .help = "write error action",
805 },{
806 .name = "copy-on-read",
807 .type = QEMU_OPT_BOOL,
808 .help = "copy read data from backing file into image file",
809 },
810
811 { /* end of list */ }
812 },
813 };
814
815 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
816 {
817 const char *value;
818 BlockBackend *blk;
819 DriveInfo *dinfo = NULL;
820 QDict *bs_opts;
821 QemuOpts *legacy_opts;
822 DriveMediaType media = MEDIA_DISK;
823 BlockInterfaceType type;
824 int cyls, heads, secs, translation;
825 int max_devs, bus_id, unit_id, index;
826 const char *devaddr;
827 const char *werror, *rerror;
828 bool read_only = false;
829 bool copy_on_read;
830 const char *serial;
831 const char *filename;
832 Error *local_err = NULL;
833 int i;
834
835 /* Change legacy command line options into QMP ones */
836 static const struct {
837 const char *from;
838 const char *to;
839 } opt_renames[] = {
840 { "iops", "throttling.iops-total" },
841 { "iops_rd", "throttling.iops-read" },
842 { "iops_wr", "throttling.iops-write" },
843
844 { "bps", "throttling.bps-total" },
845 { "bps_rd", "throttling.bps-read" },
846 { "bps_wr", "throttling.bps-write" },
847
848 { "iops_max", "throttling.iops-total-max" },
849 { "iops_rd_max", "throttling.iops-read-max" },
850 { "iops_wr_max", "throttling.iops-write-max" },
851
852 { "bps_max", "throttling.bps-total-max" },
853 { "bps_rd_max", "throttling.bps-read-max" },
854 { "bps_wr_max", "throttling.bps-write-max" },
855
856 { "iops_size", "throttling.iops-size" },
857
858 { "group", "throttling.group" },
859
860 { "readonly", "read-only" },
861 };
862
863 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
864 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
865 &local_err);
866 if (local_err) {
867 error_report_err(local_err);
868 return NULL;
869 }
870 }
871
872 value = qemu_opt_get(all_opts, "cache");
873 if (value) {
874 int flags = 0;
875
876 if (bdrv_parse_cache_flags(value, &flags) != 0) {
877 error_report("invalid cache option");
878 return NULL;
879 }
880
881 /* Specific options take precedence */
882 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
883 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
884 !!(flags & BDRV_O_CACHE_WB), &error_abort);
885 }
886 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
887 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
888 !!(flags & BDRV_O_NOCACHE), &error_abort);
889 }
890 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
891 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
892 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
893 }
894 qemu_opt_unset(all_opts, "cache");
895 }
896
897 /* Get a QDict for processing the options */
898 bs_opts = qdict_new();
899 qemu_opts_to_qdict(all_opts, bs_opts);
900
901 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
902 &error_abort);
903 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
904 if (local_err) {
905 error_report_err(local_err);
906 goto fail;
907 }
908
909 /* Deprecated option boot=[on|off] */
910 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
911 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
912 "ignored. Future versions will reject this parameter. Please "
913 "update your scripts.\n");
914 }
915
916 /* Media type */
917 value = qemu_opt_get(legacy_opts, "media");
918 if (value) {
919 if (!strcmp(value, "disk")) {
920 media = MEDIA_DISK;
921 } else if (!strcmp(value, "cdrom")) {
922 media = MEDIA_CDROM;
923 read_only = true;
924 } else {
925 error_report("'%s' invalid media", value);
926 goto fail;
927 }
928 }
929
930 /* copy-on-read is disabled with a warning for read-only devices */
931 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
932 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
933
934 if (read_only && copy_on_read) {
935 error_report("warning: disabling copy-on-read on read-only drive");
936 copy_on_read = false;
937 }
938
939 qdict_put(bs_opts, "read-only",
940 qstring_from_str(read_only ? "on" : "off"));
941 qdict_put(bs_opts, "copy-on-read",
942 qstring_from_str(copy_on_read ? "on" :"off"));
943
944 /* Controller type */
945 value = qemu_opt_get(legacy_opts, "if");
946 if (value) {
947 for (type = 0;
948 type < IF_COUNT && strcmp(value, if_name[type]);
949 type++) {
950 }
951 if (type == IF_COUNT) {
952 error_report("unsupported bus type '%s'", value);
953 goto fail;
954 }
955 } else {
956 type = block_default_type;
957 }
958
959 /* Geometry */
960 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
961 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
962 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
963
964 if (cyls || heads || secs) {
965 if (cyls < 1) {
966 error_report("invalid physical cyls number");
967 goto fail;
968 }
969 if (heads < 1) {
970 error_report("invalid physical heads number");
971 goto fail;
972 }
973 if (secs < 1) {
974 error_report("invalid physical secs number");
975 goto fail;
976 }
977 }
978
979 translation = BIOS_ATA_TRANSLATION_AUTO;
980 value = qemu_opt_get(legacy_opts, "trans");
981 if (value != NULL) {
982 if (!cyls) {
983 error_report("'%s' trans must be used with cyls, heads and secs",
984 value);
985 goto fail;
986 }
987 if (!strcmp(value, "none")) {
988 translation = BIOS_ATA_TRANSLATION_NONE;
989 } else if (!strcmp(value, "lba")) {
990 translation = BIOS_ATA_TRANSLATION_LBA;
991 } else if (!strcmp(value, "large")) {
992 translation = BIOS_ATA_TRANSLATION_LARGE;
993 } else if (!strcmp(value, "rechs")) {
994 translation = BIOS_ATA_TRANSLATION_RECHS;
995 } else if (!strcmp(value, "auto")) {
996 translation = BIOS_ATA_TRANSLATION_AUTO;
997 } else {
998 error_report("'%s' invalid translation type", value);
999 goto fail;
1000 }
1001 }
1002
1003 if (media == MEDIA_CDROM) {
1004 if (cyls || secs || heads) {
1005 error_report("CHS can't be set with media=cdrom");
1006 goto fail;
1007 }
1008 }
1009
1010 /* Device address specified by bus/unit or index.
1011 * If none was specified, try to find the first free one. */
1012 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
1013 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
1014 index = qemu_opt_get_number(legacy_opts, "index", -1);
1015
1016 max_devs = if_max_devs[type];
1017
1018 if (index != -1) {
1019 if (bus_id != 0 || unit_id != -1) {
1020 error_report("index cannot be used with bus and unit");
1021 goto fail;
1022 }
1023 bus_id = drive_index_to_bus_id(type, index);
1024 unit_id = drive_index_to_unit_id(type, index);
1025 }
1026
1027 if (unit_id == -1) {
1028 unit_id = 0;
1029 while (drive_get(type, bus_id, unit_id) != NULL) {
1030 unit_id++;
1031 if (max_devs && unit_id >= max_devs) {
1032 unit_id -= max_devs;
1033 bus_id++;
1034 }
1035 }
1036 }
1037
1038 if (max_devs && unit_id >= max_devs) {
1039 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1040 goto fail;
1041 }
1042
1043 if (drive_get(type, bus_id, unit_id) != NULL) {
1044 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1045 bus_id, unit_id, index);
1046 goto fail;
1047 }
1048
1049 /* Serial number */
1050 serial = qemu_opt_get(legacy_opts, "serial");
1051
1052 /* no id supplied -> create one */
1053 if (qemu_opts_id(all_opts) == NULL) {
1054 char *new_id;
1055 const char *mediastr = "";
1056 if (type == IF_IDE || type == IF_SCSI) {
1057 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1058 }
1059 if (max_devs) {
1060 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1061 mediastr, unit_id);
1062 } else {
1063 new_id = g_strdup_printf("%s%s%i", if_name[type],
1064 mediastr, unit_id);
1065 }
1066 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1067 g_free(new_id);
1068 }
1069
1070 /* Add virtio block device */
1071 devaddr = qemu_opt_get(legacy_opts, "addr");
1072 if (devaddr && type != IF_VIRTIO) {
1073 error_report("addr is not supported by this bus type");
1074 goto fail;
1075 }
1076
1077 if (type == IF_VIRTIO) {
1078 QemuOpts *devopts;
1079 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1080 &error_abort);
1081 if (arch_type == QEMU_ARCH_S390X) {
1082 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1083 } else {
1084 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1085 }
1086 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1087 &error_abort);
1088 if (devaddr) {
1089 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1090 }
1091 }
1092
1093 filename = qemu_opt_get(legacy_opts, "file");
1094
1095 /* Check werror/rerror compatibility with if=... */
1096 werror = qemu_opt_get(legacy_opts, "werror");
1097 if (werror != NULL) {
1098 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1099 type != IF_NONE) {
1100 error_report("werror is not supported by this bus type");
1101 goto fail;
1102 }
1103 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1104 }
1105
1106 rerror = qemu_opt_get(legacy_opts, "rerror");
1107 if (rerror != NULL) {
1108 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1109 type != IF_NONE) {
1110 error_report("rerror is not supported by this bus type");
1111 goto fail;
1112 }
1113 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1114 }
1115
1116 /* Actual block device init: Functionality shared with blockdev-add */
1117 blk = blockdev_init(filename, bs_opts, &local_err);
1118 bs_opts = NULL;
1119 if (!blk) {
1120 if (local_err) {
1121 error_report_err(local_err);
1122 }
1123 goto fail;
1124 } else {
1125 assert(!local_err);
1126 }
1127
1128 /* Create legacy DriveInfo */
1129 dinfo = g_malloc0(sizeof(*dinfo));
1130 dinfo->opts = all_opts;
1131
1132 dinfo->cyls = cyls;
1133 dinfo->heads = heads;
1134 dinfo->secs = secs;
1135 dinfo->trans = translation;
1136
1137 dinfo->type = type;
1138 dinfo->bus = bus_id;
1139 dinfo->unit = unit_id;
1140 dinfo->devaddr = devaddr;
1141 dinfo->serial = g_strdup(serial);
1142
1143 blk_set_legacy_dinfo(blk, dinfo);
1144
1145 switch(type) {
1146 case IF_IDE:
1147 case IF_SCSI:
1148 case IF_XEN:
1149 case IF_NONE:
1150 dinfo->media_cd = media == MEDIA_CDROM;
1151 break;
1152 default:
1153 break;
1154 }
1155
1156 fail:
1157 qemu_opts_del(legacy_opts);
1158 QDECREF(bs_opts);
1159 return dinfo;
1160 }
1161
1162 void hmp_commit(Monitor *mon, const QDict *qdict)
1163 {
1164 const char *device = qdict_get_str(qdict, "device");
1165 BlockBackend *blk;
1166 int ret;
1167
1168 if (!strcmp(device, "all")) {
1169 ret = bdrv_commit_all();
1170 } else {
1171 BlockDriverState *bs;
1172 AioContext *aio_context;
1173
1174 blk = blk_by_name(device);
1175 if (!blk) {
1176 monitor_printf(mon, "Device '%s' not found\n", device);
1177 return;
1178 }
1179 if (!blk_is_available(blk)) {
1180 monitor_printf(mon, "Device '%s' has no medium\n", device);
1181 return;
1182 }
1183
1184 bs = blk_bs(blk);
1185 aio_context = bdrv_get_aio_context(bs);
1186 aio_context_acquire(aio_context);
1187
1188 ret = bdrv_commit(bs);
1189
1190 aio_context_release(aio_context);
1191 }
1192 if (ret < 0) {
1193 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1194 strerror(-ret));
1195 }
1196 }
1197
1198 static void blockdev_do_action(TransactionAction *action, Error **errp)
1199 {
1200 TransactionActionList list;
1201
1202 list.value = action;
1203 list.next = NULL;
1204 qmp_transaction(&list, false, NULL, errp);
1205 }
1206
1207 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1208 bool has_node_name, const char *node_name,
1209 const char *snapshot_file,
1210 bool has_snapshot_node_name,
1211 const char *snapshot_node_name,
1212 bool has_format, const char *format,
1213 bool has_mode, NewImageMode mode, Error **errp)
1214 {
1215 BlockdevSnapshotSync snapshot = {
1216 .has_device = has_device,
1217 .device = (char *) device,
1218 .has_node_name = has_node_name,
1219 .node_name = (char *) node_name,
1220 .snapshot_file = (char *) snapshot_file,
1221 .has_snapshot_node_name = has_snapshot_node_name,
1222 .snapshot_node_name = (char *) snapshot_node_name,
1223 .has_format = has_format,
1224 .format = (char *) format,
1225 .has_mode = has_mode,
1226 .mode = mode,
1227 };
1228 TransactionAction action = {
1229 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1230 .u.blockdev_snapshot_sync = &snapshot,
1231 };
1232 blockdev_do_action(&action, errp);
1233 }
1234
1235 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1236 Error **errp)
1237 {
1238 BlockdevSnapshot snapshot_data = {
1239 .node = (char *) node,
1240 .overlay = (char *) overlay
1241 };
1242 TransactionAction action = {
1243 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1244 .u.blockdev_snapshot = &snapshot_data,
1245 };
1246 blockdev_do_action(&action, errp);
1247 }
1248
1249 void qmp_blockdev_snapshot_internal_sync(const char *device,
1250 const char *name,
1251 Error **errp)
1252 {
1253 BlockdevSnapshotInternal snapshot = {
1254 .device = (char *) device,
1255 .name = (char *) name
1256 };
1257 TransactionAction action = {
1258 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1259 .u.blockdev_snapshot_internal_sync = &snapshot,
1260 };
1261 blockdev_do_action(&action, errp);
1262 }
1263
1264 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1265 bool has_id,
1266 const char *id,
1267 bool has_name,
1268 const char *name,
1269 Error **errp)
1270 {
1271 BlockDriverState *bs;
1272 BlockBackend *blk;
1273 AioContext *aio_context;
1274 QEMUSnapshotInfo sn;
1275 Error *local_err = NULL;
1276 SnapshotInfo *info = NULL;
1277 int ret;
1278
1279 blk = blk_by_name(device);
1280 if (!blk) {
1281 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1282 "Device '%s' not found", device);
1283 return NULL;
1284 }
1285
1286 aio_context = blk_get_aio_context(blk);
1287 aio_context_acquire(aio_context);
1288
1289 if (!has_id) {
1290 id = NULL;
1291 }
1292
1293 if (!has_name) {
1294 name = NULL;
1295 }
1296
1297 if (!id && !name) {
1298 error_setg(errp, "Name or id must be provided");
1299 goto out_aio_context;
1300 }
1301
1302 if (!blk_is_available(blk)) {
1303 error_setg(errp, "Device '%s' has no medium", device);
1304 goto out_aio_context;
1305 }
1306 bs = blk_bs(blk);
1307
1308 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1309 goto out_aio_context;
1310 }
1311
1312 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1313 if (local_err) {
1314 error_propagate(errp, local_err);
1315 goto out_aio_context;
1316 }
1317 if (!ret) {
1318 error_setg(errp,
1319 "Snapshot with id '%s' and name '%s' does not exist on "
1320 "device '%s'",
1321 STR_OR_NULL(id), STR_OR_NULL(name), device);
1322 goto out_aio_context;
1323 }
1324
1325 bdrv_snapshot_delete(bs, id, name, &local_err);
1326 if (local_err) {
1327 error_propagate(errp, local_err);
1328 goto out_aio_context;
1329 }
1330
1331 aio_context_release(aio_context);
1332
1333 info = g_new0(SnapshotInfo, 1);
1334 info->id = g_strdup(sn.id_str);
1335 info->name = g_strdup(sn.name);
1336 info->date_nsec = sn.date_nsec;
1337 info->date_sec = sn.date_sec;
1338 info->vm_state_size = sn.vm_state_size;
1339 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1340 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1341
1342 return info;
1343
1344 out_aio_context:
1345 aio_context_release(aio_context);
1346 return NULL;
1347 }
1348
1349 /**
1350 * block_dirty_bitmap_lookup:
1351 * Return a dirty bitmap (if present), after validating
1352 * the node reference and bitmap names.
1353 *
1354 * @node: The name of the BDS node to search for bitmaps
1355 * @name: The name of the bitmap to search for
1356 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1357 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1358 * @errp: Output pointer for error information. Can be NULL.
1359 *
1360 * @return: A bitmap object on success, or NULL on failure.
1361 */
1362 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1363 const char *name,
1364 BlockDriverState **pbs,
1365 AioContext **paio,
1366 Error **errp)
1367 {
1368 BlockDriverState *bs;
1369 BdrvDirtyBitmap *bitmap;
1370 AioContext *aio_context;
1371
1372 if (!node) {
1373 error_setg(errp, "Node cannot be NULL");
1374 return NULL;
1375 }
1376 if (!name) {
1377 error_setg(errp, "Bitmap name cannot be NULL");
1378 return NULL;
1379 }
1380 bs = bdrv_lookup_bs(node, node, NULL);
1381 if (!bs) {
1382 error_setg(errp, "Node '%s' not found", node);
1383 return NULL;
1384 }
1385
1386 aio_context = bdrv_get_aio_context(bs);
1387 aio_context_acquire(aio_context);
1388
1389 bitmap = bdrv_find_dirty_bitmap(bs, name);
1390 if (!bitmap) {
1391 error_setg(errp, "Dirty bitmap '%s' not found", name);
1392 goto fail;
1393 }
1394
1395 if (pbs) {
1396 *pbs = bs;
1397 }
1398 if (paio) {
1399 *paio = aio_context;
1400 } else {
1401 aio_context_release(aio_context);
1402 }
1403
1404 return bitmap;
1405
1406 fail:
1407 aio_context_release(aio_context);
1408 return NULL;
1409 }
1410
1411 /* New and old BlockDriverState structs for atomic group operations */
1412
1413 typedef struct BlkActionState BlkActionState;
1414
1415 /**
1416 * BlkActionOps:
1417 * Table of operations that define an Action.
1418 *
1419 * @instance_size: Size of state struct, in bytes.
1420 * @prepare: Prepare the work, must NOT be NULL.
1421 * @commit: Commit the changes, can be NULL.
1422 * @abort: Abort the changes on fail, can be NULL.
1423 * @clean: Clean up resources after all transaction actions have called
1424 * commit() or abort(). Can be NULL.
1425 *
1426 * Only prepare() may fail. In a single transaction, only one of commit() or
1427 * abort() will be called. clean() will always be called if it is present.
1428 */
1429 typedef struct BlkActionOps {
1430 size_t instance_size;
1431 void (*prepare)(BlkActionState *common, Error **errp);
1432 void (*commit)(BlkActionState *common);
1433 void (*abort)(BlkActionState *common);
1434 void (*clean)(BlkActionState *common);
1435 } BlkActionOps;
1436
1437 /**
1438 * BlkActionState:
1439 * Describes one Action's state within a Transaction.
1440 *
1441 * @action: QAPI-defined enum identifying which Action to perform.
1442 * @ops: Table of ActionOps this Action can perform.
1443 * @block_job_txn: Transaction which this action belongs to.
1444 * @entry: List membership for all Actions in this Transaction.
1445 *
1446 * This structure must be arranged as first member in a subclassed type,
1447 * assuming that the compiler will also arrange it to the same offsets as the
1448 * base class.
1449 */
1450 struct BlkActionState {
1451 TransactionAction *action;
1452 const BlkActionOps *ops;
1453 BlockJobTxn *block_job_txn;
1454 TransactionProperties *txn_props;
1455 QSIMPLEQ_ENTRY(BlkActionState) entry;
1456 };
1457
1458 /* internal snapshot private data */
1459 typedef struct InternalSnapshotState {
1460 BlkActionState common;
1461 BlockDriverState *bs;
1462 AioContext *aio_context;
1463 QEMUSnapshotInfo sn;
1464 bool created;
1465 } InternalSnapshotState;
1466
1467
1468 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1469 {
1470 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1471 error_setg(errp,
1472 "Action '%s' does not support Transaction property "
1473 "completion-mode = %s",
1474 TransactionActionKind_lookup[s->action->type],
1475 ActionCompletionMode_lookup[s->txn_props->completion_mode]);
1476 return -1;
1477 }
1478 return 0;
1479 }
1480
1481 static void internal_snapshot_prepare(BlkActionState *common,
1482 Error **errp)
1483 {
1484 Error *local_err = NULL;
1485 const char *device;
1486 const char *name;
1487 BlockBackend *blk;
1488 BlockDriverState *bs;
1489 QEMUSnapshotInfo old_sn, *sn;
1490 bool ret;
1491 qemu_timeval tv;
1492 BlockdevSnapshotInternal *internal;
1493 InternalSnapshotState *state;
1494 int ret1;
1495
1496 g_assert(common->action->type ==
1497 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1498 internal = common->action->u.blockdev_snapshot_internal_sync;
1499 state = DO_UPCAST(InternalSnapshotState, common, common);
1500
1501 /* 1. parse input */
1502 device = internal->device;
1503 name = internal->name;
1504
1505 /* 2. check for validation */
1506 if (action_check_completion_mode(common, errp) < 0) {
1507 return;
1508 }
1509
1510 blk = blk_by_name(device);
1511 if (!blk) {
1512 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1513 "Device '%s' not found", device);
1514 return;
1515 }
1516
1517 /* AioContext is released in .clean() */
1518 state->aio_context = blk_get_aio_context(blk);
1519 aio_context_acquire(state->aio_context);
1520
1521 if (!blk_is_available(blk)) {
1522 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1523 return;
1524 }
1525 bs = blk_bs(blk);
1526
1527 state->bs = bs;
1528 bdrv_drained_begin(bs);
1529
1530 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1531 return;
1532 }
1533
1534 if (bdrv_is_read_only(bs)) {
1535 error_setg(errp, "Device '%s' is read only", device);
1536 return;
1537 }
1538
1539 if (!bdrv_can_snapshot(bs)) {
1540 error_setg(errp, "Block format '%s' used by device '%s' "
1541 "does not support internal snapshots",
1542 bs->drv->format_name, device);
1543 return;
1544 }
1545
1546 if (!strlen(name)) {
1547 error_setg(errp, "Name is empty");
1548 return;
1549 }
1550
1551 /* check whether a snapshot with name exist */
1552 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1553 &local_err);
1554 if (local_err) {
1555 error_propagate(errp, local_err);
1556 return;
1557 } else if (ret) {
1558 error_setg(errp,
1559 "Snapshot with name '%s' already exists on device '%s'",
1560 name, device);
1561 return;
1562 }
1563
1564 /* 3. take the snapshot */
1565 sn = &state->sn;
1566 pstrcpy(sn->name, sizeof(sn->name), name);
1567 qemu_gettimeofday(&tv);
1568 sn->date_sec = tv.tv_sec;
1569 sn->date_nsec = tv.tv_usec * 1000;
1570 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1571
1572 ret1 = bdrv_snapshot_create(bs, sn);
1573 if (ret1 < 0) {
1574 error_setg_errno(errp, -ret1,
1575 "Failed to create snapshot '%s' on device '%s'",
1576 name, device);
1577 return;
1578 }
1579
1580 /* 4. succeed, mark a snapshot is created */
1581 state->created = true;
1582 }
1583
1584 static void internal_snapshot_abort(BlkActionState *common)
1585 {
1586 InternalSnapshotState *state =
1587 DO_UPCAST(InternalSnapshotState, common, common);
1588 BlockDriverState *bs = state->bs;
1589 QEMUSnapshotInfo *sn = &state->sn;
1590 Error *local_error = NULL;
1591
1592 if (!state->created) {
1593 return;
1594 }
1595
1596 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1597 error_reportf_err(local_error,
1598 "Failed to delete snapshot with id '%s' and "
1599 "name '%s' on device '%s' in abort: ",
1600 sn->id_str, sn->name,
1601 bdrv_get_device_name(bs));
1602 }
1603 }
1604
1605 static void internal_snapshot_clean(BlkActionState *common)
1606 {
1607 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1608 common, common);
1609
1610 if (state->aio_context) {
1611 if (state->bs) {
1612 bdrv_drained_end(state->bs);
1613 }
1614 aio_context_release(state->aio_context);
1615 }
1616 }
1617
1618 /* external snapshot private data */
1619 typedef struct ExternalSnapshotState {
1620 BlkActionState common;
1621 BlockDriverState *old_bs;
1622 BlockDriverState *new_bs;
1623 AioContext *aio_context;
1624 } ExternalSnapshotState;
1625
1626 static void external_snapshot_prepare(BlkActionState *common,
1627 Error **errp)
1628 {
1629 int flags = 0, ret;
1630 QDict *options = NULL;
1631 Error *local_err = NULL;
1632 /* Device and node name of the image to generate the snapshot from */
1633 const char *device;
1634 const char *node_name;
1635 /* Reference to the new image (for 'blockdev-snapshot') */
1636 const char *snapshot_ref;
1637 /* File name of the new image (for 'blockdev-snapshot-sync') */
1638 const char *new_image_file;
1639 ExternalSnapshotState *state =
1640 DO_UPCAST(ExternalSnapshotState, common, common);
1641 TransactionAction *action = common->action;
1642
1643 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1644 * purpose but a different set of parameters */
1645 switch (action->type) {
1646 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1647 {
1648 BlockdevSnapshot *s = action->u.blockdev_snapshot;
1649 device = s->node;
1650 node_name = s->node;
1651 new_image_file = NULL;
1652 snapshot_ref = s->overlay;
1653 }
1654 break;
1655 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1656 {
1657 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1658 device = s->has_device ? s->device : NULL;
1659 node_name = s->has_node_name ? s->node_name : NULL;
1660 new_image_file = s->snapshot_file;
1661 snapshot_ref = NULL;
1662 }
1663 break;
1664 default:
1665 g_assert_not_reached();
1666 }
1667
1668 /* start processing */
1669 if (action_check_completion_mode(common, errp) < 0) {
1670 return;
1671 }
1672
1673 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1674 if (!state->old_bs) {
1675 return;
1676 }
1677
1678 /* Acquire AioContext now so any threads operating on old_bs stop */
1679 state->aio_context = bdrv_get_aio_context(state->old_bs);
1680 aio_context_acquire(state->aio_context);
1681 bdrv_drained_begin(state->old_bs);
1682
1683 if (!bdrv_is_inserted(state->old_bs)) {
1684 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1685 return;
1686 }
1687
1688 if (bdrv_op_is_blocked(state->old_bs,
1689 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1690 return;
1691 }
1692
1693 if (!bdrv_is_read_only(state->old_bs)) {
1694 if (bdrv_flush(state->old_bs)) {
1695 error_setg(errp, QERR_IO_ERROR);
1696 return;
1697 }
1698 }
1699
1700 if (!bdrv_is_first_non_filter(state->old_bs)) {
1701 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1702 return;
1703 }
1704
1705 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1706 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1707 const char *format = s->has_format ? s->format : "qcow2";
1708 enum NewImageMode mode;
1709 const char *snapshot_node_name =
1710 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1711
1712 if (node_name && !snapshot_node_name) {
1713 error_setg(errp, "New snapshot node name missing");
1714 return;
1715 }
1716
1717 if (snapshot_node_name &&
1718 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1719 error_setg(errp, "New snapshot node name already in use");
1720 return;
1721 }
1722
1723 flags = state->old_bs->open_flags;
1724
1725 /* create new image w/backing file */
1726 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1727 if (mode != NEW_IMAGE_MODE_EXISTING) {
1728 int64_t size = bdrv_getlength(state->old_bs);
1729 if (size < 0) {
1730 error_setg_errno(errp, -size, "bdrv_getlength failed");
1731 return;
1732 }
1733 bdrv_img_create(new_image_file, format,
1734 state->old_bs->filename,
1735 state->old_bs->drv->format_name,
1736 NULL, size, 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 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2518 BDRV_O_PROTOCOL);
2519
2520 if (!has_read_only) {
2521 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2522 }
2523
2524 switch (read_only) {
2525 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2526 break;
2527
2528 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2529 bdrv_flags &= ~BDRV_O_RDWR;
2530 break;
2531
2532 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2533 bdrv_flags |= BDRV_O_RDWR;
2534 break;
2535
2536 default:
2537 abort();
2538 }
2539
2540 if (has_format) {
2541 options = qdict_new();
2542 qdict_put(options, "driver", qstring_from_str(format));
2543 }
2544
2545 assert(!medium_bs);
2546 ret = bdrv_open(&medium_bs, filename, NULL, options, bdrv_flags, errp);
2547 if (ret < 0) {
2548 goto fail;
2549 }
2550
2551 blk_apply_root_state(blk, medium_bs);
2552
2553 bdrv_add_key(medium_bs, NULL, &err);
2554 if (err) {
2555 error_propagate(errp, err);
2556 goto fail;
2557 }
2558
2559 qmp_blockdev_open_tray(device, false, false, &err);
2560 if (err) {
2561 error_propagate(errp, err);
2562 goto fail;
2563 }
2564
2565 qmp_x_blockdev_remove_medium(device, &err);
2566 if (err) {
2567 error_propagate(errp, err);
2568 goto fail;
2569 }
2570
2571 qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
2572 if (err) {
2573 error_propagate(errp, err);
2574 goto fail;
2575 }
2576
2577 qmp_blockdev_close_tray(device, errp);
2578
2579 fail:
2580 /* If the medium has been inserted, the device has its own reference, so
2581 * ours must be relinquished; and if it has not been inserted successfully,
2582 * the reference must be relinquished anyway */
2583 bdrv_unref(medium_bs);
2584 }
2585
2586 /* throttling disk I/O limits */
2587 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2588 int64_t bps_wr,
2589 int64_t iops,
2590 int64_t iops_rd,
2591 int64_t iops_wr,
2592 bool has_bps_max,
2593 int64_t bps_max,
2594 bool has_bps_rd_max,
2595 int64_t bps_rd_max,
2596 bool has_bps_wr_max,
2597 int64_t bps_wr_max,
2598 bool has_iops_max,
2599 int64_t iops_max,
2600 bool has_iops_rd_max,
2601 int64_t iops_rd_max,
2602 bool has_iops_wr_max,
2603 int64_t iops_wr_max,
2604 bool has_bps_max_length,
2605 int64_t bps_max_length,
2606 bool has_bps_rd_max_length,
2607 int64_t bps_rd_max_length,
2608 bool has_bps_wr_max_length,
2609 int64_t bps_wr_max_length,
2610 bool has_iops_max_length,
2611 int64_t iops_max_length,
2612 bool has_iops_rd_max_length,
2613 int64_t iops_rd_max_length,
2614 bool has_iops_wr_max_length,
2615 int64_t iops_wr_max_length,
2616 bool has_iops_size,
2617 int64_t iops_size,
2618 bool has_group,
2619 const char *group, Error **errp)
2620 {
2621 ThrottleConfig cfg;
2622 BlockDriverState *bs;
2623 BlockBackend *blk;
2624 AioContext *aio_context;
2625
2626 blk = blk_by_name(device);
2627 if (!blk) {
2628 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2629 "Device '%s' not found", device);
2630 return;
2631 }
2632
2633 aio_context = blk_get_aio_context(blk);
2634 aio_context_acquire(aio_context);
2635
2636 bs = blk_bs(blk);
2637 if (!bs) {
2638 error_setg(errp, "Device '%s' has no medium", device);
2639 goto out;
2640 }
2641
2642 throttle_config_init(&cfg);
2643 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2644 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2645 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2646
2647 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2648 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2649 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2650
2651 if (has_bps_max) {
2652 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2653 }
2654 if (has_bps_rd_max) {
2655 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2656 }
2657 if (has_bps_wr_max) {
2658 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2659 }
2660 if (has_iops_max) {
2661 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2662 }
2663 if (has_iops_rd_max) {
2664 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2665 }
2666 if (has_iops_wr_max) {
2667 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2668 }
2669
2670 if (has_bps_max_length) {
2671 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = bps_max_length;
2672 }
2673 if (has_bps_rd_max_length) {
2674 cfg.buckets[THROTTLE_BPS_READ].burst_length = bps_rd_max_length;
2675 }
2676 if (has_bps_wr_max_length) {
2677 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = bps_wr_max_length;
2678 }
2679 if (has_iops_max_length) {
2680 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = iops_max_length;
2681 }
2682 if (has_iops_rd_max_length) {
2683 cfg.buckets[THROTTLE_OPS_READ].burst_length = iops_rd_max_length;
2684 }
2685 if (has_iops_wr_max_length) {
2686 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = iops_wr_max_length;
2687 }
2688
2689 if (has_iops_size) {
2690 cfg.op_size = iops_size;
2691 }
2692
2693 if (!throttle_is_valid(&cfg, errp)) {
2694 goto out;
2695 }
2696
2697 if (throttle_enabled(&cfg)) {
2698 /* Enable I/O limits if they're not enabled yet, otherwise
2699 * just update the throttling group. */
2700 if (!bs->throttle_state) {
2701 bdrv_io_limits_enable(bs, has_group ? group : device);
2702 } else if (has_group) {
2703 bdrv_io_limits_update_group(bs, group);
2704 }
2705 /* Set the new throttling configuration */
2706 bdrv_set_io_limits(bs, &cfg);
2707 } else if (bs->throttle_state) {
2708 /* If all throttling settings are set to 0, disable I/O limits */
2709 bdrv_io_limits_disable(bs);
2710 }
2711
2712 out:
2713 aio_context_release(aio_context);
2714 }
2715
2716 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2717 bool has_granularity, uint32_t granularity,
2718 Error **errp)
2719 {
2720 AioContext *aio_context;
2721 BlockDriverState *bs;
2722
2723 if (!name || name[0] == '\0') {
2724 error_setg(errp, "Bitmap name cannot be empty");
2725 return;
2726 }
2727
2728 bs = bdrv_lookup_bs(node, node, errp);
2729 if (!bs) {
2730 return;
2731 }
2732
2733 aio_context = bdrv_get_aio_context(bs);
2734 aio_context_acquire(aio_context);
2735
2736 if (has_granularity) {
2737 if (granularity < 512 || !is_power_of_2(granularity)) {
2738 error_setg(errp, "Granularity must be power of 2 "
2739 "and at least 512");
2740 goto out;
2741 }
2742 } else {
2743 /* Default to cluster size, if available: */
2744 granularity = bdrv_get_default_bitmap_granularity(bs);
2745 }
2746
2747 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2748
2749 out:
2750 aio_context_release(aio_context);
2751 }
2752
2753 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2754 Error **errp)
2755 {
2756 AioContext *aio_context;
2757 BlockDriverState *bs;
2758 BdrvDirtyBitmap *bitmap;
2759
2760 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2761 if (!bitmap || !bs) {
2762 return;
2763 }
2764
2765 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2766 error_setg(errp,
2767 "Bitmap '%s' is currently frozen and cannot be removed",
2768 name);
2769 goto out;
2770 }
2771 bdrv_dirty_bitmap_make_anon(bitmap);
2772 bdrv_release_dirty_bitmap(bs, bitmap);
2773
2774 out:
2775 aio_context_release(aio_context);
2776 }
2777
2778 /**
2779 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2780 * immediately after a full backup operation.
2781 */
2782 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2783 Error **errp)
2784 {
2785 AioContext *aio_context;
2786 BdrvDirtyBitmap *bitmap;
2787 BlockDriverState *bs;
2788
2789 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2790 if (!bitmap || !bs) {
2791 return;
2792 }
2793
2794 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2795 error_setg(errp,
2796 "Bitmap '%s' is currently frozen and cannot be modified",
2797 name);
2798 goto out;
2799 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2800 error_setg(errp,
2801 "Bitmap '%s' is currently disabled and cannot be cleared",
2802 name);
2803 goto out;
2804 }
2805
2806 bdrv_clear_dirty_bitmap(bitmap, NULL);
2807
2808 out:
2809 aio_context_release(aio_context);
2810 }
2811
2812 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2813 {
2814 const char *id = qdict_get_str(qdict, "id");
2815 BlockBackend *blk;
2816 BlockDriverState *bs;
2817 AioContext *aio_context;
2818 Error *local_err = NULL;
2819
2820 blk = blk_by_name(id);
2821 if (!blk) {
2822 error_report("Device '%s' not found", id);
2823 return;
2824 }
2825
2826 if (!blk_legacy_dinfo(blk)) {
2827 error_report("Deleting device added with blockdev-add"
2828 " is not supported");
2829 return;
2830 }
2831
2832 aio_context = blk_get_aio_context(blk);
2833 aio_context_acquire(aio_context);
2834
2835 bs = blk_bs(blk);
2836 if (bs) {
2837 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2838 error_report_err(local_err);
2839 aio_context_release(aio_context);
2840 return;
2841 }
2842
2843 blk_remove_bs(blk);
2844 }
2845
2846 /* if we have a device attached to this BlockDriverState
2847 * then we need to make the drive anonymous until the device
2848 * can be removed. If this is a drive with no device backing
2849 * then we can just get rid of the block driver state right here.
2850 */
2851 if (blk_get_attached_dev(blk)) {
2852 blk_hide_on_behalf_of_hmp_drive_del(blk);
2853 /* Further I/O must not pause the guest */
2854 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2855 BLOCKDEV_ON_ERROR_REPORT);
2856 } else {
2857 blk_unref(blk);
2858 }
2859
2860 aio_context_release(aio_context);
2861 }
2862
2863 void qmp_block_resize(bool has_device, const char *device,
2864 bool has_node_name, const char *node_name,
2865 int64_t size, Error **errp)
2866 {
2867 Error *local_err = NULL;
2868 BlockDriverState *bs;
2869 AioContext *aio_context;
2870 int ret;
2871
2872 bs = bdrv_lookup_bs(has_device ? device : NULL,
2873 has_node_name ? node_name : NULL,
2874 &local_err);
2875 if (local_err) {
2876 error_propagate(errp, local_err);
2877 return;
2878 }
2879
2880 aio_context = bdrv_get_aio_context(bs);
2881 aio_context_acquire(aio_context);
2882
2883 if (!bdrv_is_first_non_filter(bs)) {
2884 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2885 goto out;
2886 }
2887
2888 if (size < 0) {
2889 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2890 goto out;
2891 }
2892
2893 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2894 error_setg(errp, QERR_DEVICE_IN_USE, device);
2895 goto out;
2896 }
2897
2898 /* complete all in-flight operations before resizing the device */
2899 bdrv_drain_all();
2900
2901 ret = bdrv_truncate(bs, size);
2902 switch (ret) {
2903 case 0:
2904 break;
2905 case -ENOMEDIUM:
2906 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2907 break;
2908 case -ENOTSUP:
2909 error_setg(errp, QERR_UNSUPPORTED);
2910 break;
2911 case -EACCES:
2912 error_setg(errp, "Device '%s' is read only", device);
2913 break;
2914 case -EBUSY:
2915 error_setg(errp, QERR_DEVICE_IN_USE, device);
2916 break;
2917 default:
2918 error_setg_errno(errp, -ret, "Could not resize");
2919 break;
2920 }
2921
2922 out:
2923 aio_context_release(aio_context);
2924 }
2925
2926 static void block_job_cb(void *opaque, int ret)
2927 {
2928 /* Note that this function may be executed from another AioContext besides
2929 * the QEMU main loop. If you need to access anything that assumes the
2930 * QEMU global mutex, use a BH or introduce a mutex.
2931 */
2932
2933 BlockDriverState *bs = opaque;
2934 const char *msg = NULL;
2935
2936 trace_block_job_cb(bs, bs->job, ret);
2937
2938 assert(bs->job);
2939
2940 if (ret < 0) {
2941 msg = strerror(-ret);
2942 }
2943
2944 if (block_job_is_cancelled(bs->job)) {
2945 block_job_event_cancelled(bs->job);
2946 } else {
2947 block_job_event_completed(bs->job, msg);
2948 }
2949 }
2950
2951 void qmp_block_stream(const char *device,
2952 bool has_base, const char *base,
2953 bool has_backing_file, const char *backing_file,
2954 bool has_speed, int64_t speed,
2955 bool has_on_error, BlockdevOnError on_error,
2956 Error **errp)
2957 {
2958 BlockBackend *blk;
2959 BlockDriverState *bs;
2960 BlockDriverState *base_bs = NULL;
2961 AioContext *aio_context;
2962 Error *local_err = NULL;
2963 const char *base_name = NULL;
2964
2965 if (!has_on_error) {
2966 on_error = BLOCKDEV_ON_ERROR_REPORT;
2967 }
2968
2969 blk = blk_by_name(device);
2970 if (!blk) {
2971 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2972 "Device '%s' not found", device);
2973 return;
2974 }
2975
2976 aio_context = blk_get_aio_context(blk);
2977 aio_context_acquire(aio_context);
2978
2979 if (!blk_is_available(blk)) {
2980 error_setg(errp, "Device '%s' has no medium", device);
2981 goto out;
2982 }
2983 bs = blk_bs(blk);
2984
2985 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2986 goto out;
2987 }
2988
2989 if (has_base) {
2990 base_bs = bdrv_find_backing_image(bs, base);
2991 if (base_bs == NULL) {
2992 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2993 goto out;
2994 }
2995 assert(bdrv_get_aio_context(base_bs) == aio_context);
2996 base_name = base;
2997 }
2998
2999 /* if we are streaming the entire chain, the result will have no backing
3000 * file, and specifying one is therefore an error */
3001 if (base_bs == NULL && has_backing_file) {
3002 error_setg(errp, "backing file specified, but streaming the "
3003 "entire chain");
3004 goto out;
3005 }
3006
3007 /* backing_file string overrides base bs filename */
3008 base_name = has_backing_file ? backing_file : base_name;
3009
3010 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
3011 on_error, block_job_cb, bs, &local_err);
3012 if (local_err) {
3013 error_propagate(errp, local_err);
3014 goto out;
3015 }
3016
3017 trace_qmp_block_stream(bs, bs->job);
3018
3019 out:
3020 aio_context_release(aio_context);
3021 }
3022
3023 void qmp_block_commit(const char *device,
3024 bool has_base, const char *base,
3025 bool has_top, const char *top,
3026 bool has_backing_file, const char *backing_file,
3027 bool has_speed, int64_t speed,
3028 Error **errp)
3029 {
3030 BlockBackend *blk;
3031 BlockDriverState *bs;
3032 BlockDriverState *base_bs, *top_bs;
3033 AioContext *aio_context;
3034 Error *local_err = NULL;
3035 /* This will be part of the QMP command, if/when the
3036 * BlockdevOnError change for blkmirror makes it in
3037 */
3038 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3039
3040 if (!has_speed) {
3041 speed = 0;
3042 }
3043
3044 /* Important Note:
3045 * libvirt relies on the DeviceNotFound error class in order to probe for
3046 * live commit feature versions; for this to work, we must make sure to
3047 * perform the device lookup before any generic errors that may occur in a
3048 * scenario in which all optional arguments are omitted. */
3049 blk = blk_by_name(device);
3050 if (!blk) {
3051 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3052 "Device '%s' not found", device);
3053 return;
3054 }
3055
3056 aio_context = blk_get_aio_context(blk);
3057 aio_context_acquire(aio_context);
3058
3059 if (!blk_is_available(blk)) {
3060 error_setg(errp, "Device '%s' has no medium", device);
3061 goto out;
3062 }
3063 bs = blk_bs(blk);
3064
3065 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3066 goto out;
3067 }
3068
3069 /* default top_bs is the active layer */
3070 top_bs = bs;
3071
3072 if (has_top && top) {
3073 if (strcmp(bs->filename, top) != 0) {
3074 top_bs = bdrv_find_backing_image(bs, top);
3075 }
3076 }
3077
3078 if (top_bs == NULL) {
3079 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3080 goto out;
3081 }
3082
3083 assert(bdrv_get_aio_context(top_bs) == aio_context);
3084
3085 if (has_base && base) {
3086 base_bs = bdrv_find_backing_image(top_bs, base);
3087 } else {
3088 base_bs = bdrv_find_base(top_bs);
3089 }
3090
3091 if (base_bs == NULL) {
3092 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3093 goto out;
3094 }
3095
3096 assert(bdrv_get_aio_context(base_bs) == aio_context);
3097
3098 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3099 goto out;
3100 }
3101
3102 /* Do not allow attempts to commit an image into itself */
3103 if (top_bs == base_bs) {
3104 error_setg(errp, "cannot commit an image into itself");
3105 goto out;
3106 }
3107
3108 if (top_bs == bs) {
3109 if (has_backing_file) {
3110 error_setg(errp, "'backing-file' specified,"
3111 " but 'top' is the active layer");
3112 goto out;
3113 }
3114 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
3115 bs, &local_err);
3116 } else {
3117 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
3118 has_backing_file ? backing_file : NULL, &local_err);
3119 }
3120 if (local_err != NULL) {
3121 error_propagate(errp, local_err);
3122 goto out;
3123 }
3124
3125 out:
3126 aio_context_release(aio_context);
3127 }
3128
3129 static void do_drive_backup(const char *device, const char *target,
3130 bool has_format, const char *format,
3131 enum MirrorSyncMode sync,
3132 bool has_mode, enum NewImageMode mode,
3133 bool has_speed, int64_t speed,
3134 bool has_bitmap, const char *bitmap,
3135 bool has_on_source_error,
3136 BlockdevOnError on_source_error,
3137 bool has_on_target_error,
3138 BlockdevOnError on_target_error,
3139 BlockJobTxn *txn, Error **errp)
3140 {
3141 BlockBackend *blk;
3142 BlockDriverState *bs;
3143 BlockDriverState *target_bs;
3144 BlockDriverState *source = NULL;
3145 BdrvDirtyBitmap *bmap = NULL;
3146 AioContext *aio_context;
3147 QDict *options = NULL;
3148 Error *local_err = NULL;
3149 int flags;
3150 int64_t size;
3151 int ret;
3152
3153 if (!has_speed) {
3154 speed = 0;
3155 }
3156 if (!has_on_source_error) {
3157 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3158 }
3159 if (!has_on_target_error) {
3160 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3161 }
3162 if (!has_mode) {
3163 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3164 }
3165
3166 blk = blk_by_name(device);
3167 if (!blk) {
3168 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3169 "Device '%s' not found", device);
3170 return;
3171 }
3172
3173 aio_context = blk_get_aio_context(blk);
3174 aio_context_acquire(aio_context);
3175
3176 /* Although backup_run has this check too, we need to use bs->drv below, so
3177 * do an early check redundantly. */
3178 if (!blk_is_available(blk)) {
3179 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3180 goto out;
3181 }
3182 bs = blk_bs(blk);
3183
3184 if (!has_format) {
3185 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3186 }
3187
3188 /* Early check to avoid creating target */
3189 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3190 goto out;
3191 }
3192
3193 flags = bs->open_flags | BDRV_O_RDWR;
3194
3195 /* See if we have a backing HD we can use to create our new image
3196 * on top of. */
3197 if (sync == MIRROR_SYNC_MODE_TOP) {
3198 source = backing_bs(bs);
3199 if (!source) {
3200 sync = MIRROR_SYNC_MODE_FULL;
3201 }
3202 }
3203 if (sync == MIRROR_SYNC_MODE_NONE) {
3204 source = bs;
3205 }
3206
3207 size = bdrv_getlength(bs);
3208 if (size < 0) {
3209 error_setg_errno(errp, -size, "bdrv_getlength failed");
3210 goto out;
3211 }
3212
3213 if (mode != NEW_IMAGE_MODE_EXISTING) {
3214 assert(format);
3215 if (source) {
3216 bdrv_img_create(target, format, source->filename,
3217 source->drv->format_name, NULL,
3218 size, flags, &local_err, false);
3219 } else {
3220 bdrv_img_create(target, format, NULL, NULL, NULL,
3221 size, flags, &local_err, false);
3222 }
3223 }
3224
3225 if (local_err) {
3226 error_propagate(errp, local_err);
3227 goto out;
3228 }
3229
3230 if (format) {
3231 options = qdict_new();
3232 qdict_put(options, "driver", qstring_from_str(format));
3233 }
3234
3235 target_bs = NULL;
3236 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
3237 if (ret < 0) {
3238 error_propagate(errp, local_err);
3239 goto out;
3240 }
3241
3242 bdrv_set_aio_context(target_bs, aio_context);
3243
3244 if (has_bitmap) {
3245 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
3246 if (!bmap) {
3247 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
3248 bdrv_unref(target_bs);
3249 goto out;
3250 }
3251 }
3252
3253 backup_start(bs, target_bs, speed, sync, bmap,
3254 on_source_error, on_target_error,
3255 block_job_cb, bs, txn, &local_err);
3256 if (local_err != NULL) {
3257 bdrv_unref(target_bs);
3258 error_propagate(errp, local_err);
3259 goto out;
3260 }
3261
3262 out:
3263 aio_context_release(aio_context);
3264 }
3265
3266 void qmp_drive_backup(const char *device, const char *target,
3267 bool has_format, const char *format,
3268 enum MirrorSyncMode sync,
3269 bool has_mode, enum NewImageMode mode,
3270 bool has_speed, int64_t speed,
3271 bool has_bitmap, const char *bitmap,
3272 bool has_on_source_error, BlockdevOnError on_source_error,
3273 bool has_on_target_error, BlockdevOnError on_target_error,
3274 Error **errp)
3275 {
3276 return do_drive_backup(device, target, has_format, format, sync,
3277 has_mode, mode, has_speed, speed,
3278 has_bitmap, bitmap,
3279 has_on_source_error, on_source_error,
3280 has_on_target_error, on_target_error,
3281 NULL, errp);
3282 }
3283
3284 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3285 {
3286 return bdrv_named_nodes_list(errp);
3287 }
3288
3289 void do_blockdev_backup(const char *device, const char *target,
3290 enum MirrorSyncMode sync,
3291 bool has_speed, int64_t speed,
3292 bool has_on_source_error,
3293 BlockdevOnError on_source_error,
3294 bool has_on_target_error,
3295 BlockdevOnError on_target_error,
3296 BlockJobTxn *txn, Error **errp)
3297 {
3298 BlockBackend *blk, *target_blk;
3299 BlockDriverState *bs;
3300 BlockDriverState *target_bs;
3301 Error *local_err = NULL;
3302 AioContext *aio_context;
3303
3304 if (!has_speed) {
3305 speed = 0;
3306 }
3307 if (!has_on_source_error) {
3308 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3309 }
3310 if (!has_on_target_error) {
3311 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3312 }
3313
3314 blk = blk_by_name(device);
3315 if (!blk) {
3316 error_setg(errp, "Device '%s' not found", device);
3317 return;
3318 }
3319
3320 aio_context = blk_get_aio_context(blk);
3321 aio_context_acquire(aio_context);
3322
3323 if (!blk_is_available(blk)) {
3324 error_setg(errp, "Device '%s' has no medium", device);
3325 goto out;
3326 }
3327 bs = blk_bs(blk);
3328
3329 target_blk = blk_by_name(target);
3330 if (!target_blk) {
3331 error_setg(errp, "Device '%s' not found", target);
3332 goto out;
3333 }
3334
3335 if (!blk_is_available(target_blk)) {
3336 error_setg(errp, "Device '%s' has no medium", target);
3337 goto out;
3338 }
3339 target_bs = blk_bs(target_blk);
3340
3341 bdrv_ref(target_bs);
3342 bdrv_set_aio_context(target_bs, aio_context);
3343 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
3344 on_target_error, block_job_cb, bs, txn, &local_err);
3345 if (local_err != NULL) {
3346 bdrv_unref(target_bs);
3347 error_propagate(errp, local_err);
3348 }
3349 out:
3350 aio_context_release(aio_context);
3351 }
3352
3353 void qmp_blockdev_backup(const char *device, const char *target,
3354 enum MirrorSyncMode sync,
3355 bool has_speed, int64_t speed,
3356 bool has_on_source_error,
3357 BlockdevOnError on_source_error,
3358 bool has_on_target_error,
3359 BlockdevOnError on_target_error,
3360 Error **errp)
3361 {
3362 do_blockdev_backup(device, target, sync, has_speed, speed,
3363 has_on_source_error, on_source_error,
3364 has_on_target_error, on_target_error,
3365 NULL, errp);
3366 }
3367
3368 /* Parameter check and block job starting for drive mirroring.
3369 * Caller should hold @device and @target's aio context (must be the same).
3370 **/
3371 static void blockdev_mirror_common(BlockDriverState *bs,
3372 BlockDriverState *target,
3373 bool has_replaces, const char *replaces,
3374 enum MirrorSyncMode sync,
3375 bool has_speed, int64_t speed,
3376 bool has_granularity, uint32_t granularity,
3377 bool has_buf_size, int64_t buf_size,
3378 bool has_on_source_error,
3379 BlockdevOnError on_source_error,
3380 bool has_on_target_error,
3381 BlockdevOnError on_target_error,
3382 bool has_unmap, bool unmap,
3383 Error **errp)
3384 {
3385
3386 if (!has_speed) {
3387 speed = 0;
3388 }
3389 if (!has_on_source_error) {
3390 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3391 }
3392 if (!has_on_target_error) {
3393 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3394 }
3395 if (!has_granularity) {
3396 granularity = 0;
3397 }
3398 if (!has_buf_size) {
3399 buf_size = 0;
3400 }
3401 if (!has_unmap) {
3402 unmap = true;
3403 }
3404
3405 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3406 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3407 "a value in range [512B, 64MB]");
3408 return;
3409 }
3410 if (granularity & (granularity - 1)) {
3411 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3412 "power of 2");
3413 return;
3414 }
3415
3416 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3417 return;
3418 }
3419 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3420 return;
3421 }
3422 if (target->blk) {
3423 error_setg(errp, "Cannot mirror to an attached block device");
3424 return;
3425 }
3426
3427 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3428 sync = MIRROR_SYNC_MODE_FULL;
3429 }
3430
3431 /* pass the node name to replace to mirror start since it's loose coupling
3432 * and will allow to check whether the node still exist at mirror completion
3433 */
3434 mirror_start(bs, target,
3435 has_replaces ? replaces : NULL,
3436 speed, granularity, buf_size, sync,
3437 on_source_error, on_target_error, unmap,
3438 block_job_cb, bs, errp);
3439 }
3440
3441 void qmp_drive_mirror(const char *device, const char *target,
3442 bool has_format, const char *format,
3443 bool has_node_name, const char *node_name,
3444 bool has_replaces, const char *replaces,
3445 enum MirrorSyncMode sync,
3446 bool has_mode, enum NewImageMode mode,
3447 bool has_speed, int64_t speed,
3448 bool has_granularity, uint32_t granularity,
3449 bool has_buf_size, int64_t buf_size,
3450 bool has_on_source_error, BlockdevOnError on_source_error,
3451 bool has_on_target_error, BlockdevOnError on_target_error,
3452 bool has_unmap, bool unmap,
3453 Error **errp)
3454 {
3455 BlockDriverState *bs;
3456 BlockBackend *blk;
3457 BlockDriverState *source, *target_bs;
3458 AioContext *aio_context;
3459 Error *local_err = NULL;
3460 QDict *options = NULL;
3461 int flags;
3462 int64_t size;
3463 int ret;
3464
3465 blk = blk_by_name(device);
3466 if (!blk) {
3467 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3468 "Device '%s' not found", device);
3469 return;
3470 }
3471
3472 aio_context = blk_get_aio_context(blk);
3473 aio_context_acquire(aio_context);
3474
3475 if (!blk_is_available(blk)) {
3476 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3477 goto out;
3478 }
3479 bs = blk_bs(blk);
3480 if (!has_mode) {
3481 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3482 }
3483
3484 if (!has_format) {
3485 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3486 }
3487
3488 flags = bs->open_flags | BDRV_O_RDWR;
3489 source = backing_bs(bs);
3490 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3491 sync = MIRROR_SYNC_MODE_FULL;
3492 }
3493 if (sync == MIRROR_SYNC_MODE_NONE) {
3494 source = bs;
3495 }
3496
3497 size = bdrv_getlength(bs);
3498 if (size < 0) {
3499 error_setg_errno(errp, -size, "bdrv_getlength failed");
3500 goto out;
3501 }
3502
3503 if (has_replaces) {
3504 BlockDriverState *to_replace_bs;
3505 AioContext *replace_aio_context;
3506 int64_t replace_size;
3507
3508 if (!has_node_name) {
3509 error_setg(errp, "a node-name must be provided when replacing a"
3510 " named node of the graph");
3511 goto out;
3512 }
3513
3514 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3515
3516 if (!to_replace_bs) {
3517 error_propagate(errp, local_err);
3518 goto out;
3519 }
3520
3521 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3522 aio_context_acquire(replace_aio_context);
3523 replace_size = bdrv_getlength(to_replace_bs);
3524 aio_context_release(replace_aio_context);
3525
3526 if (size != replace_size) {
3527 error_setg(errp, "cannot replace image with a mirror image of "
3528 "different size");
3529 goto out;
3530 }
3531 }
3532
3533 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3534 && mode != NEW_IMAGE_MODE_EXISTING)
3535 {
3536 /* create new image w/o backing file */
3537 assert(format);
3538 bdrv_img_create(target, format,
3539 NULL, NULL, NULL, size, flags, &local_err, false);
3540 } else {
3541 switch (mode) {
3542 case NEW_IMAGE_MODE_EXISTING:
3543 break;
3544 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3545 /* create new image with backing file */
3546 bdrv_img_create(target, format,
3547 source->filename,
3548 source->drv->format_name,
3549 NULL, size, flags, &local_err, false);
3550 break;
3551 default:
3552 abort();
3553 }
3554 }
3555
3556 if (local_err) {
3557 error_propagate(errp, local_err);
3558 goto out;
3559 }
3560
3561 options = qdict_new();
3562 if (has_node_name) {
3563 qdict_put(options, "node-name", qstring_from_str(node_name));
3564 }
3565 if (format) {
3566 qdict_put(options, "driver", qstring_from_str(format));
3567 }
3568
3569 /* Mirroring takes care of copy-on-write using the source's backing
3570 * file.
3571 */
3572 target_bs = NULL;
3573 ret = bdrv_open(&target_bs, target, NULL, options,
3574 flags | BDRV_O_NO_BACKING, &local_err);
3575 if (ret < 0) {
3576 error_propagate(errp, local_err);
3577 goto out;
3578 }
3579
3580 bdrv_set_aio_context(target_bs, aio_context);
3581
3582 blockdev_mirror_common(bs, target_bs,
3583 has_replaces, replaces, sync,
3584 has_speed, speed,
3585 has_granularity, granularity,
3586 has_buf_size, buf_size,
3587 has_on_source_error, on_source_error,
3588 has_on_target_error, on_target_error,
3589 has_unmap, unmap,
3590 &local_err);
3591 if (local_err) {
3592 error_propagate(errp, local_err);
3593 bdrv_unref(target_bs);
3594 }
3595 out:
3596 aio_context_release(aio_context);
3597 }
3598
3599 void qmp_blockdev_mirror(const char *device, const char *target,
3600 bool has_replaces, const char *replaces,
3601 MirrorSyncMode sync,
3602 bool has_speed, int64_t speed,
3603 bool has_granularity, uint32_t granularity,
3604 bool has_buf_size, int64_t buf_size,
3605 bool has_on_source_error,
3606 BlockdevOnError on_source_error,
3607 bool has_on_target_error,
3608 BlockdevOnError on_target_error,
3609 Error **errp)
3610 {
3611 BlockDriverState *bs;
3612 BlockBackend *blk;
3613 BlockDriverState *target_bs;
3614 AioContext *aio_context;
3615 Error *local_err = NULL;
3616
3617 blk = blk_by_name(device);
3618 if (!blk) {
3619 error_setg(errp, "Device '%s' not found", device);
3620 return;
3621 }
3622 bs = blk_bs(blk);
3623
3624 if (!bs) {
3625 error_setg(errp, "Device '%s' has no media", device);
3626 return;
3627 }
3628
3629 target_bs = bdrv_lookup_bs(target, target, errp);
3630 if (!target_bs) {
3631 return;
3632 }
3633
3634 aio_context = bdrv_get_aio_context(bs);
3635 aio_context_acquire(aio_context);
3636
3637 bdrv_ref(target_bs);
3638 bdrv_set_aio_context(target_bs, aio_context);
3639
3640 blockdev_mirror_common(bs, target_bs,
3641 has_replaces, replaces, sync,
3642 has_speed, speed,
3643 has_granularity, granularity,
3644 has_buf_size, buf_size,
3645 has_on_source_error, on_source_error,
3646 has_on_target_error, on_target_error,
3647 true, true,
3648 &local_err);
3649 if (local_err) {
3650 error_propagate(errp, local_err);
3651 bdrv_unref(target_bs);
3652 }
3653
3654 aio_context_release(aio_context);
3655 }
3656
3657 /* Get the block job for a given device name and acquire its AioContext */
3658 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3659 Error **errp)
3660 {
3661 BlockBackend *blk;
3662 BlockDriverState *bs;
3663
3664 *aio_context = NULL;
3665
3666 blk = blk_by_name(device);
3667 if (!blk) {
3668 goto notfound;
3669 }
3670
3671 *aio_context = blk_get_aio_context(blk);
3672 aio_context_acquire(*aio_context);
3673
3674 if (!blk_is_available(blk)) {
3675 goto notfound;
3676 }
3677 bs = blk_bs(blk);
3678
3679 if (!bs->job) {
3680 goto notfound;
3681 }
3682
3683 return bs->job;
3684
3685 notfound:
3686 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3687 "No active block job on device '%s'", device);
3688 if (*aio_context) {
3689 aio_context_release(*aio_context);
3690 *aio_context = NULL;
3691 }
3692 return NULL;
3693 }
3694
3695 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3696 {
3697 AioContext *aio_context;
3698 BlockJob *job = find_block_job(device, &aio_context, errp);
3699
3700 if (!job) {
3701 return;
3702 }
3703
3704 block_job_set_speed(job, speed, errp);
3705 aio_context_release(aio_context);
3706 }
3707
3708 void qmp_block_job_cancel(const char *device,
3709 bool has_force, bool force, Error **errp)
3710 {
3711 AioContext *aio_context;
3712 BlockJob *job = find_block_job(device, &aio_context, errp);
3713
3714 if (!job) {
3715 return;
3716 }
3717
3718 if (!has_force) {
3719 force = false;
3720 }
3721
3722 if (job->user_paused && !force) {
3723 error_setg(errp, "The block job for device '%s' is currently paused",
3724 device);
3725 goto out;
3726 }
3727
3728 trace_qmp_block_job_cancel(job);
3729 block_job_cancel(job);
3730 out:
3731 aio_context_release(aio_context);
3732 }
3733
3734 void qmp_block_job_pause(const char *device, Error **errp)
3735 {
3736 AioContext *aio_context;
3737 BlockJob *job = find_block_job(device, &aio_context, errp);
3738
3739 if (!job || job->user_paused) {
3740 return;
3741 }
3742
3743 job->user_paused = true;
3744 trace_qmp_block_job_pause(job);
3745 block_job_pause(job);
3746 aio_context_release(aio_context);
3747 }
3748
3749 void qmp_block_job_resume(const char *device, Error **errp)
3750 {
3751 AioContext *aio_context;
3752 BlockJob *job = find_block_job(device, &aio_context, errp);
3753
3754 if (!job || !job->user_paused) {
3755 return;
3756 }
3757
3758 job->user_paused = false;
3759 trace_qmp_block_job_resume(job);
3760 block_job_resume(job);
3761 aio_context_release(aio_context);
3762 }
3763
3764 void qmp_block_job_complete(const char *device, Error **errp)
3765 {
3766 AioContext *aio_context;
3767 BlockJob *job = find_block_job(device, &aio_context, errp);
3768
3769 if (!job) {
3770 return;
3771 }
3772
3773 trace_qmp_block_job_complete(job);
3774 block_job_complete(job, errp);
3775 aio_context_release(aio_context);
3776 }
3777
3778 void qmp_change_backing_file(const char *device,
3779 const char *image_node_name,
3780 const char *backing_file,
3781 Error **errp)
3782 {
3783 BlockBackend *blk;
3784 BlockDriverState *bs = NULL;
3785 AioContext *aio_context;
3786 BlockDriverState *image_bs = NULL;
3787 Error *local_err = NULL;
3788 bool ro;
3789 int open_flags;
3790 int ret;
3791
3792 blk = blk_by_name(device);
3793 if (!blk) {
3794 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3795 "Device '%s' not found", device);
3796 return;
3797 }
3798
3799 aio_context = blk_get_aio_context(blk);
3800 aio_context_acquire(aio_context);
3801
3802 if (!blk_is_available(blk)) {
3803 error_setg(errp, "Device '%s' has no medium", device);
3804 goto out;
3805 }
3806 bs = blk_bs(blk);
3807
3808 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3809 if (local_err) {
3810 error_propagate(errp, local_err);
3811 goto out;
3812 }
3813
3814 if (!image_bs) {
3815 error_setg(errp, "image file not found");
3816 goto out;
3817 }
3818
3819 if (bdrv_find_base(image_bs) == image_bs) {
3820 error_setg(errp, "not allowing backing file change on an image "
3821 "without a backing file");
3822 goto out;
3823 }
3824
3825 /* even though we are not necessarily operating on bs, we need it to
3826 * determine if block ops are currently prohibited on the chain */
3827 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3828 goto out;
3829 }
3830
3831 /* final sanity check */
3832 if (!bdrv_chain_contains(bs, image_bs)) {
3833 error_setg(errp, "'%s' and image file are not in the same chain",
3834 device);
3835 goto out;
3836 }
3837
3838 /* if not r/w, reopen to make r/w */
3839 open_flags = image_bs->open_flags;
3840 ro = bdrv_is_read_only(image_bs);
3841
3842 if (ro) {
3843 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3844 if (local_err) {
3845 error_propagate(errp, local_err);
3846 goto out;
3847 }
3848 }
3849
3850 ret = bdrv_change_backing_file(image_bs, backing_file,
3851 image_bs->drv ? image_bs->drv->format_name : "");
3852
3853 if (ret < 0) {
3854 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3855 backing_file);
3856 /* don't exit here, so we can try to restore open flags if
3857 * appropriate */
3858 }
3859
3860 if (ro) {
3861 bdrv_reopen(image_bs, open_flags, &local_err);
3862 if (local_err) {
3863 error_propagate(errp, local_err); /* will preserve prior errp */
3864 }
3865 }
3866
3867 out:
3868 aio_context_release(aio_context);
3869 }
3870
3871 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3872 {
3873 QmpOutputVisitor *ov = qmp_output_visitor_new();
3874 BlockDriverState *bs;
3875 BlockBackend *blk = NULL;
3876 QObject *obj;
3877 QDict *qdict;
3878 Error *local_err = NULL;
3879
3880 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3881 * cache.direct=false instead of silently switching to aio=threads, except
3882 * when called from drive_new().
3883 *
3884 * For now, simply forbidding the combination for all drivers will do. */
3885 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3886 bool direct = options->has_cache &&
3887 options->cache->has_direct &&
3888 options->cache->direct;
3889 if (!direct) {
3890 error_setg(errp, "aio=native requires cache.direct=true");
3891 goto fail;
3892 }
3893 }
3894
3895 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), NULL, &options,
3896 &local_err);
3897 if (local_err) {
3898 error_propagate(errp, local_err);
3899 goto fail;
3900 }
3901
3902 obj = qmp_output_get_qobject(ov);
3903 qdict = qobject_to_qdict(obj);
3904
3905 qdict_flatten(qdict);
3906
3907 if (options->has_id) {
3908 blk = blockdev_init(NULL, qdict, &local_err);
3909 if (local_err) {
3910 error_propagate(errp, local_err);
3911 goto fail;
3912 }
3913
3914 bs = blk_bs(blk);
3915 } else {
3916 if (!qdict_get_try_str(qdict, "node-name")) {
3917 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3918 "the root node");
3919 goto fail;
3920 }
3921
3922 bs = bds_tree_init(qdict, errp);
3923 if (!bs) {
3924 goto fail;
3925 }
3926
3927 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3928 }
3929
3930 if (bs && bdrv_key_required(bs)) {
3931 if (blk) {
3932 blk_unref(blk);
3933 } else {
3934 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3935 bdrv_unref(bs);
3936 }
3937 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3938 goto fail;
3939 }
3940
3941 fail:
3942 qmp_output_visitor_cleanup(ov);
3943 }
3944
3945 void qmp_x_blockdev_del(bool has_id, const char *id,
3946 bool has_node_name, const char *node_name, Error **errp)
3947 {
3948 AioContext *aio_context;
3949 BlockBackend *blk;
3950 BlockDriverState *bs;
3951
3952 if (has_id && has_node_name) {
3953 error_setg(errp, "Only one of id and node-name must be specified");
3954 return;
3955 } else if (!has_id && !has_node_name) {
3956 error_setg(errp, "No block device specified");
3957 return;
3958 }
3959
3960 if (has_id) {
3961 blk = blk_by_name(id);
3962 if (!blk) {
3963 error_setg(errp, "Cannot find block backend %s", id);
3964 return;
3965 }
3966 if (blk_get_refcnt(blk) > 1) {
3967 error_setg(errp, "Block backend %s is in use", id);
3968 return;
3969 }
3970 bs = blk_bs(blk);
3971 aio_context = blk_get_aio_context(blk);
3972 } else {
3973 bs = bdrv_find_node(node_name);
3974 if (!bs) {
3975 error_setg(errp, "Cannot find node %s", node_name);
3976 return;
3977 }
3978 blk = bs->blk;
3979 if (blk) {
3980 error_setg(errp, "Node %s is in use by %s",
3981 node_name, blk_name(blk));
3982 return;
3983 }
3984 aio_context = bdrv_get_aio_context(bs);
3985 }
3986
3987 aio_context_acquire(aio_context);
3988
3989 if (bs) {
3990 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3991 goto out;
3992 }
3993
3994 if (!blk && !bs->monitor_list.tqe_prev) {
3995 error_setg(errp, "Node %s is not owned by the monitor",
3996 bs->node_name);
3997 goto out;
3998 }
3999
4000 if (bs->refcnt > 1) {
4001 error_setg(errp, "Block device %s is in use",
4002 bdrv_get_device_or_node_name(bs));
4003 goto out;
4004 }
4005 }
4006
4007 if (blk) {
4008 blk_unref(blk);
4009 } else {
4010 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4011 bdrv_unref(bs);
4012 }
4013
4014 out:
4015 aio_context_release(aio_context);
4016 }
4017
4018 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4019 {
4020 BlockJobInfoList *head = NULL, **p_next = &head;
4021 BlockDriverState *bs;
4022
4023 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
4024 AioContext *aio_context = bdrv_get_aio_context(bs);
4025
4026 aio_context_acquire(aio_context);
4027
4028 if (bs->job) {
4029 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
4030 elem->value = block_job_query(bs->job);
4031 *p_next = elem;
4032 p_next = &elem->next;
4033 }
4034
4035 aio_context_release(aio_context);
4036 }
4037
4038 return head;
4039 }
4040
4041 QemuOptsList qemu_common_drive_opts = {
4042 .name = "drive",
4043 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4044 .desc = {
4045 {
4046 .name = "snapshot",
4047 .type = QEMU_OPT_BOOL,
4048 .help = "enable/disable snapshot mode",
4049 },{
4050 .name = "discard",
4051 .type = QEMU_OPT_STRING,
4052 .help = "discard operation (ignore/off, unmap/on)",
4053 },{
4054 .name = "aio",
4055 .type = QEMU_OPT_STRING,
4056 .help = "host AIO implementation (threads, native)",
4057 },{
4058 .name = "format",
4059 .type = QEMU_OPT_STRING,
4060 .help = "disk format (raw, qcow2, ...)",
4061 },{
4062 .name = "rerror",
4063 .type = QEMU_OPT_STRING,
4064 .help = "read error action",
4065 },{
4066 .name = "werror",
4067 .type = QEMU_OPT_STRING,
4068 .help = "write error action",
4069 },{
4070 .name = "read-only",
4071 .type = QEMU_OPT_BOOL,
4072 .help = "open drive file as read-only",
4073 },{
4074 .name = "throttling.iops-total",
4075 .type = QEMU_OPT_NUMBER,
4076 .help = "limit total I/O operations per second",
4077 },{
4078 .name = "throttling.iops-read",
4079 .type = QEMU_OPT_NUMBER,
4080 .help = "limit read operations per second",
4081 },{
4082 .name = "throttling.iops-write",
4083 .type = QEMU_OPT_NUMBER,
4084 .help = "limit write operations per second",
4085 },{
4086 .name = "throttling.bps-total",
4087 .type = QEMU_OPT_NUMBER,
4088 .help = "limit total bytes per second",
4089 },{
4090 .name = "throttling.bps-read",
4091 .type = QEMU_OPT_NUMBER,
4092 .help = "limit read bytes per second",
4093 },{
4094 .name = "throttling.bps-write",
4095 .type = QEMU_OPT_NUMBER,
4096 .help = "limit write bytes per second",
4097 },{
4098 .name = "throttling.iops-total-max",
4099 .type = QEMU_OPT_NUMBER,
4100 .help = "I/O operations burst",
4101 },{
4102 .name = "throttling.iops-read-max",
4103 .type = QEMU_OPT_NUMBER,
4104 .help = "I/O operations read burst",
4105 },{
4106 .name = "throttling.iops-write-max",
4107 .type = QEMU_OPT_NUMBER,
4108 .help = "I/O operations write burst",
4109 },{
4110 .name = "throttling.bps-total-max",
4111 .type = QEMU_OPT_NUMBER,
4112 .help = "total bytes burst",
4113 },{
4114 .name = "throttling.bps-read-max",
4115 .type = QEMU_OPT_NUMBER,
4116 .help = "total bytes read burst",
4117 },{
4118 .name = "throttling.bps-write-max",
4119 .type = QEMU_OPT_NUMBER,
4120 .help = "total bytes write burst",
4121 },{
4122 .name = "throttling.iops-total-max-length",
4123 .type = QEMU_OPT_NUMBER,
4124 .help = "length of the iops-total-max burst period, in seconds",
4125 },{
4126 .name = "throttling.iops-read-max-length",
4127 .type = QEMU_OPT_NUMBER,
4128 .help = "length of the iops-read-max burst period, in seconds",
4129 },{
4130 .name = "throttling.iops-write-max-length",
4131 .type = QEMU_OPT_NUMBER,
4132 .help = "length of the iops-write-max burst period, in seconds",
4133 },{
4134 .name = "throttling.bps-total-max-length",
4135 .type = QEMU_OPT_NUMBER,
4136 .help = "length of the bps-total-max burst period, in seconds",
4137 },{
4138 .name = "throttling.bps-read-max-length",
4139 .type = QEMU_OPT_NUMBER,
4140 .help = "length of the bps-read-max burst period, in seconds",
4141 },{
4142 .name = "throttling.bps-write-max-length",
4143 .type = QEMU_OPT_NUMBER,
4144 .help = "length of the bps-write-max burst period, in seconds",
4145 },{
4146 .name = "throttling.iops-size",
4147 .type = QEMU_OPT_NUMBER,
4148 .help = "when limiting by iops max size of an I/O in bytes",
4149 },{
4150 .name = "throttling.group",
4151 .type = QEMU_OPT_STRING,
4152 .help = "name of the block throttling group",
4153 },{
4154 .name = "copy-on-read",
4155 .type = QEMU_OPT_BOOL,
4156 .help = "copy read data from backing file into image file",
4157 },{
4158 .name = "detect-zeroes",
4159 .type = QEMU_OPT_STRING,
4160 .help = "try to optimize zero writes (off, on, unmap)",
4161 },{
4162 .name = "stats-account-invalid",
4163 .type = QEMU_OPT_BOOL,
4164 .help = "whether to account for invalid I/O operations "
4165 "in the statistics",
4166 },{
4167 .name = "stats-account-failed",
4168 .type = QEMU_OPT_BOOL,
4169 .help = "whether to account for failed I/O operations "
4170 "in the statistics",
4171 },
4172 { /* end of list */ }
4173 },
4174 };
4175
4176 static QemuOptsList qemu_root_bds_opts = {
4177 .name = "root-bds",
4178 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4179 .desc = {
4180 {
4181 .name = "discard",
4182 .type = QEMU_OPT_STRING,
4183 .help = "discard operation (ignore/off, unmap/on)",
4184 },{
4185 .name = "aio",
4186 .type = QEMU_OPT_STRING,
4187 .help = "host AIO implementation (threads, native)",
4188 },{
4189 .name = "read-only",
4190 .type = QEMU_OPT_BOOL,
4191 .help = "open drive file as read-only",
4192 },{
4193 .name = "copy-on-read",
4194 .type = QEMU_OPT_BOOL,
4195 .help = "copy read data from backing file into image file",
4196 },{
4197 .name = "detect-zeroes",
4198 .type = QEMU_OPT_STRING,
4199 .help = "try to optimize zero writes (off, on, unmap)",
4200 },
4201 { /* end of list */ }
4202 },
4203 };
4204
4205 QemuOptsList qemu_drive_opts = {
4206 .name = "drive",
4207 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4208 .desc = {
4209 /*
4210 * no elements => accept any params
4211 * validation will happen later
4212 */
4213 { /* end of list */ }
4214 },
4215 };
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