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util: move declarations out of qemu-common.h
[qemu/ar7.git] / blockdev.c
blob3eb05d1a90568081eace11cb2906d3ec69014e95
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 #include "qemu/cutils.h"
54 #include "qemu/help_option.h"
55
56 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
57 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
58
59 static const char *const if_name[IF_COUNT] = {
60 [IF_NONE] = "none",
61 [IF_IDE] = "ide",
62 [IF_SCSI] = "scsi",
63 [IF_FLOPPY] = "floppy",
64 [IF_PFLASH] = "pflash",
65 [IF_MTD] = "mtd",
66 [IF_SD] = "sd",
67 [IF_VIRTIO] = "virtio",
68 [IF_XEN] = "xen",
69 };
70
71 static int if_max_devs[IF_COUNT] = {
72 /*
73 * Do not change these numbers! They govern how drive option
74 * index maps to unit and bus. That mapping is ABI.
75 *
76 * All controllers used to imlement if=T drives need to support
77 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
78 * Otherwise, some index values map to "impossible" bus, unit
79 * values.
80 *
81 * For instance, if you change [IF_SCSI] to 255, -drive
82 * if=scsi,index=12 no longer means bus=1,unit=5, but
83 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
84 * the drive can't be set up. Regression.
85 */
86 [IF_IDE] = 2,
87 [IF_SCSI] = 7,
88 };
89
90 /**
91 * Boards may call this to offer board-by-board overrides
92 * of the default, global values.
93 */
94 void override_max_devs(BlockInterfaceType type, int max_devs)
95 {
96 BlockBackend *blk;
97 DriveInfo *dinfo;
98
99 if (max_devs <= 0) {
100 return;
101 }
102
103 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
104 dinfo = blk_legacy_dinfo(blk);
105 if (dinfo->type == type) {
106 fprintf(stderr, "Cannot override units-per-bus property of"
107 " the %s interface, because a drive of that type has"
108 " already been added.\n", if_name[type]);
109 g_assert_not_reached();
110 }
111 }
112
113 if_max_devs[type] = max_devs;
114 }
115
116 /*
117 * We automatically delete the drive when a device using it gets
118 * unplugged. Questionable feature, but we can't just drop it.
119 * Device models call blockdev_mark_auto_del() to schedule the
120 * automatic deletion, and generic qdev code calls blockdev_auto_del()
121 * when deletion is actually safe.
122 */
123 void blockdev_mark_auto_del(BlockBackend *blk)
124 {
125 DriveInfo *dinfo = blk_legacy_dinfo(blk);
126 BlockDriverState *bs = blk_bs(blk);
127 AioContext *aio_context;
128
129 if (!dinfo) {
130 return;
131 }
132
133 if (bs) {
134 aio_context = bdrv_get_aio_context(bs);
135 aio_context_acquire(aio_context);
136
137 if (bs->job) {
138 block_job_cancel(bs->job);
139 }
140
141 aio_context_release(aio_context);
142 }
143
144 dinfo->auto_del = 1;
145 }
146
147 void blockdev_auto_del(BlockBackend *blk)
148 {
149 DriveInfo *dinfo = blk_legacy_dinfo(blk);
150
151 if (dinfo && dinfo->auto_del) {
152 monitor_remove_blk(blk);
153 blk_unref(blk);
154 }
155 }
156
157 /**
158 * Returns the current mapping of how many units per bus
159 * a particular interface can support.
160 *
161 * A positive integer indicates n units per bus.
162 * 0 implies the mapping has not been established.
163 * -1 indicates an invalid BlockInterfaceType was given.
164 */
165 int drive_get_max_devs(BlockInterfaceType type)
166 {
167 if (type >= IF_IDE && type < IF_COUNT) {
168 return if_max_devs[type];
169 }
170
171 return -1;
172 }
173
174 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
175 {
176 int max_devs = if_max_devs[type];
177 return max_devs ? index / max_devs : 0;
178 }
179
180 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
181 {
182 int max_devs = if_max_devs[type];
183 return max_devs ? index % max_devs : index;
184 }
185
186 QemuOpts *drive_def(const char *optstr)
187 {
188 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
189 }
190
191 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
192 const char *optstr)
193 {
194 QemuOpts *opts;
195
196 opts = drive_def(optstr);
197 if (!opts) {
198 return NULL;
199 }
200 if (type != IF_DEFAULT) {
201 qemu_opt_set(opts, "if", if_name[type], &error_abort);
202 }
203 if (index >= 0) {
204 qemu_opt_set_number(opts, "index", index, &error_abort);
205 }
206 if (file)
207 qemu_opt_set(opts, "file", file, &error_abort);
208 return opts;
209 }
210
211 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
212 {
213 BlockBackend *blk;
214 DriveInfo *dinfo;
215
216 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
217 dinfo = blk_legacy_dinfo(blk);
218 if (dinfo && dinfo->type == type
219 && dinfo->bus == bus && dinfo->unit == unit) {
220 return dinfo;
221 }
222 }
223
224 return NULL;
225 }
226
227 bool drive_check_orphaned(void)
228 {
229 BlockBackend *blk;
230 DriveInfo *dinfo;
231 bool rs = false;
232
233 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
234 dinfo = blk_legacy_dinfo(blk);
235 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
236 /* Unless this is a default drive, this may be an oversight. */
237 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
238 dinfo->type != IF_NONE) {
239 fprintf(stderr, "Warning: Orphaned drive without device: "
240 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
241 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
242 if_name[dinfo->type], dinfo->bus, dinfo->unit);
243 rs = true;
244 }
245 }
246
247 return rs;
248 }
249
250 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
251 {
252 return drive_get(type,
253 drive_index_to_bus_id(type, index),
254 drive_index_to_unit_id(type, index));
255 }
256
257 int drive_get_max_bus(BlockInterfaceType type)
258 {
259 int max_bus;
260 BlockBackend *blk;
261 DriveInfo *dinfo;
262
263 max_bus = -1;
264 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
265 dinfo = blk_legacy_dinfo(blk);
266 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
267 max_bus = dinfo->bus;
268 }
269 }
270 return max_bus;
271 }
272
273 /* Get a block device. This should only be used for single-drive devices
274 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
275 appropriate bus. */
276 DriveInfo *drive_get_next(BlockInterfaceType type)
277 {
278 static int next_block_unit[IF_COUNT];
279
280 return drive_get(type, 0, next_block_unit[type]++);
281 }
282
283 static void bdrv_format_print(void *opaque, const char *name)
284 {
285 error_printf(" %s", name);
286 }
287
288 typedef struct {
289 QEMUBH *bh;
290 BlockDriverState *bs;
291 } BDRVPutRefBH;
292
293 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
294 {
295 if (!strcmp(buf, "ignore")) {
296 return BLOCKDEV_ON_ERROR_IGNORE;
297 } else if (!is_read && !strcmp(buf, "enospc")) {
298 return BLOCKDEV_ON_ERROR_ENOSPC;
299 } else if (!strcmp(buf, "stop")) {
300 return BLOCKDEV_ON_ERROR_STOP;
301 } else if (!strcmp(buf, "report")) {
302 return BLOCKDEV_ON_ERROR_REPORT;
303 } else {
304 error_setg(errp, "'%s' invalid %s error action",
305 buf, is_read ? "read" : "write");
306 return -1;
307 }
308 }
309
310 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
311 Error **errp)
312 {
313 const QListEntry *entry;
314 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
315 switch (qobject_type(entry->value)) {
316
317 case QTYPE_QSTRING: {
318 unsigned long long length;
319 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
320 if (parse_uint_full(str, &length, 10) == 0 &&
321 length > 0 && length <= UINT_MAX) {
322 block_acct_add_interval(stats, (unsigned) length);
323 } else {
324 error_setg(errp, "Invalid interval length: %s", str);
325 return false;
326 }
327 break;
328 }
329
330 case QTYPE_QINT: {
331 int64_t length = qint_get_int(qobject_to_qint(entry->value));
332 if (length > 0 && length <= UINT_MAX) {
333 block_acct_add_interval(stats, (unsigned) length);
334 } else {
335 error_setg(errp, "Invalid interval length: %" PRId64, length);
336 return false;
337 }
338 break;
339 }
340
341 default:
342 error_setg(errp, "The specification of stats-intervals is invalid");
343 return false;
344 }
345 }
346 return true;
347 }
348
349 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
350
351 /* All parameters but @opts are optional and may be set to NULL. */
352 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
353 const char **throttling_group, ThrottleConfig *throttle_cfg,
354 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
355 {
356 const char *discard;
357 Error *local_error = NULL;
358 const char *aio;
359
360 if (bdrv_flags) {
361 if (!qemu_opt_get_bool(opts, "read-only", false)) {
362 *bdrv_flags |= BDRV_O_RDWR;
363 }
364 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
365 *bdrv_flags |= BDRV_O_COPY_ON_READ;
366 }
367
368 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
369 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
370 error_setg(errp, "Invalid discard option");
371 return;
372 }
373 }
374
375 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
376 if (!strcmp(aio, "native")) {
377 *bdrv_flags |= BDRV_O_NATIVE_AIO;
378 } else if (!strcmp(aio, "threads")) {
379 /* this is the default */
380 } else {
381 error_setg(errp, "invalid aio option");
382 return;
383 }
384 }
385 }
386
387 /* disk I/O throttling */
388 if (throttling_group) {
389 *throttling_group = qemu_opt_get(opts, "throttling.group");
390 }
391
392 if (throttle_cfg) {
393 throttle_config_init(throttle_cfg);
394 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
395 qemu_opt_get_number(opts, "throttling.bps-total", 0);
396 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
397 qemu_opt_get_number(opts, "throttling.bps-read", 0);
398 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
399 qemu_opt_get_number(opts, "throttling.bps-write", 0);
400 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
401 qemu_opt_get_number(opts, "throttling.iops-total", 0);
402 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
403 qemu_opt_get_number(opts, "throttling.iops-read", 0);
404 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
405 qemu_opt_get_number(opts, "throttling.iops-write", 0);
406
407 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
408 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
409 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
410 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
411 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
412 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
413 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
414 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
415 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
416 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
417 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
418 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
419
420 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
421 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
422 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
423 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
424 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
425 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
426 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
427 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
428 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
429 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
430 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
431 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
432
433 throttle_cfg->op_size =
434 qemu_opt_get_number(opts, "throttling.iops-size", 0);
435
436 if (!throttle_is_valid(throttle_cfg, errp)) {
437 return;
438 }
439 }
440
441 if (detect_zeroes) {
442 *detect_zeroes =
443 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
444 qemu_opt_get(opts, "detect-zeroes"),
445 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
446 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
447 &local_error);
448 if (local_error) {
449 error_propagate(errp, local_error);
450 return;
451 }
452
453 if (bdrv_flags &&
454 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
455 !(*bdrv_flags & BDRV_O_UNMAP))
456 {
457 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
458 "without setting discard operation to unmap");
459 return;
460 }
461 }
462 }
463
464 /* Takes the ownership of bs_opts */
465 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
466 Error **errp)
467 {
468 const char *buf;
469 int bdrv_flags = 0;
470 int on_read_error, on_write_error;
471 bool account_invalid, account_failed;
472 BlockBackend *blk;
473 BlockDriverState *bs;
474 ThrottleConfig cfg;
475 int snapshot = 0;
476 Error *error = NULL;
477 QemuOpts *opts;
478 QDict *interval_dict = NULL;
479 QList *interval_list = NULL;
480 const char *id;
481 BlockdevDetectZeroesOptions detect_zeroes =
482 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
483 const char *throttling_group = NULL;
484
485 /* Check common options by copying from bs_opts to opts, all other options
486 * stay in bs_opts for processing by bdrv_open(). */
487 id = qdict_get_try_str(bs_opts, "id");
488 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
489 if (error) {
490 error_propagate(errp, error);
491 goto err_no_opts;
492 }
493
494 qemu_opts_absorb_qdict(opts, bs_opts, &error);
495 if (error) {
496 error_propagate(errp, error);
497 goto early_err;
498 }
499
500 if (id) {
501 qdict_del(bs_opts, "id");
502 }
503
504 /* extract parameters */
505 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
506
507 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
508 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
509
510 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
511 qdict_array_split(interval_dict, &interval_list);
512
513 if (qdict_size(interval_dict) != 0) {
514 error_setg(errp, "Invalid option stats-intervals.%s",
515 qdict_first(interval_dict)->key);
516 goto early_err;
517 }
518
519 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
520 &detect_zeroes, &error);
521 if (error) {
522 error_propagate(errp, error);
523 goto early_err;
524 }
525
526 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
527 if (is_help_option(buf)) {
528 error_printf("Supported formats:");
529 bdrv_iterate_format(bdrv_format_print, NULL);
530 error_printf("\n");
531 goto early_err;
532 }
533
534 if (qdict_haskey(bs_opts, "driver")) {
535 error_setg(errp, "Cannot specify both 'driver' and 'format'");
536 goto early_err;
537 }
538 qdict_put(bs_opts, "driver", qstring_from_str(buf));
539 }
540
541 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
542 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
543 on_write_error = parse_block_error_action(buf, 0, &error);
544 if (error) {
545 error_propagate(errp, error);
546 goto early_err;
547 }
548 }
549
550 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
551 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
552 on_read_error = parse_block_error_action(buf, 1, &error);
553 if (error) {
554 error_propagate(errp, error);
555 goto early_err;
556 }
557 }
558
559 if (snapshot) {
560 bdrv_flags |= BDRV_O_SNAPSHOT;
561 }
562
563 /* init */
564 if ((!file || !*file) && !qdict_size(bs_opts)) {
565 BlockBackendRootState *blk_rs;
566
567 blk = blk_new(errp);
568 if (!blk) {
569 goto early_err;
570 }
571
572 blk_rs = blk_get_root_state(blk);
573 blk_rs->open_flags = bdrv_flags;
574 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
575 blk_rs->detect_zeroes = detect_zeroes;
576
577 if (throttle_enabled(&cfg)) {
578 if (!throttling_group) {
579 throttling_group = blk_name(blk);
580 }
581 blk_rs->throttle_group = g_strdup(throttling_group);
582 blk_rs->throttle_state = throttle_group_incref(throttling_group);
583 blk_rs->throttle_state->cfg = cfg;
584 }
585
586 QDECREF(bs_opts);
587 } else {
588 if (file && !*file) {
589 file = NULL;
590 }
591
592 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
593 * with other callers) rather than what we want as the real defaults.
594 * Apply the defaults here instead. */
595 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
596 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
597 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
598
599 if (runstate_check(RUN_STATE_INMIGRATE)) {
600 bdrv_flags |= BDRV_O_INACTIVE;
601 }
602
603 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
604 if (!blk) {
605 goto err_no_bs_opts;
606 }
607 bs = blk_bs(blk);
608
609 bs->detect_zeroes = detect_zeroes;
610
611 /* disk I/O throttling */
612 if (throttle_enabled(&cfg)) {
613 if (!throttling_group) {
614 throttling_group = blk_name(blk);
615 }
616 bdrv_io_limits_enable(bs, throttling_group);
617 bdrv_set_io_limits(bs, &cfg);
618 }
619
620 if (bdrv_key_required(bs)) {
621 autostart = 0;
622 }
623
624 block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
625
626 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
627 blk_unref(blk);
628 blk = NULL;
629 goto err_no_bs_opts;
630 }
631 }
632
633 blk_set_on_error(blk, on_read_error, on_write_error);
634
635 if (!monitor_add_blk(blk, qemu_opts_id(opts), errp)) {
636 blk_unref(blk);
637 blk = NULL;
638 goto err_no_bs_opts;
639 }
640
641 err_no_bs_opts:
642 qemu_opts_del(opts);
643 QDECREF(interval_dict);
644 QDECREF(interval_list);
645 return blk;
646
647 early_err:
648 qemu_opts_del(opts);
649 QDECREF(interval_dict);
650 QDECREF(interval_list);
651 err_no_opts:
652 QDECREF(bs_opts);
653 return NULL;
654 }
655
656 static QemuOptsList qemu_root_bds_opts;
657
658 /* Takes the ownership of bs_opts */
659 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
660 {
661 BlockDriverState *bs;
662 QemuOpts *opts;
663 Error *local_error = NULL;
664 BlockdevDetectZeroesOptions detect_zeroes;
665 int ret;
666 int bdrv_flags = 0;
667
668 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
669 if (!opts) {
670 goto fail;
671 }
672
673 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
674 if (local_error) {
675 error_propagate(errp, local_error);
676 goto fail;
677 }
678
679 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
680 &detect_zeroes, &local_error);
681 if (local_error) {
682 error_propagate(errp, local_error);
683 goto fail;
684 }
685
686 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
687 * with other callers) rather than what we want as the real defaults.
688 * Apply the defaults here instead. */
689 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
690 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
691 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
692
693 if (runstate_check(RUN_STATE_INMIGRATE)) {
694 bdrv_flags |= BDRV_O_INACTIVE;
695 }
696
697 bs = NULL;
698 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
699 if (ret < 0) {
700 goto fail_no_bs_opts;
701 }
702
703 bs->detect_zeroes = detect_zeroes;
704
705 fail_no_bs_opts:
706 qemu_opts_del(opts);
707 return bs;
708
709 fail:
710 qemu_opts_del(opts);
711 QDECREF(bs_opts);
712 return NULL;
713 }
714
715 void blockdev_close_all_bdrv_states(void)
716 {
717 BlockDriverState *bs, *next_bs;
718
719 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
720 AioContext *ctx = bdrv_get_aio_context(bs);
721
722 aio_context_acquire(ctx);
723 bdrv_unref(bs);
724 aio_context_release(ctx);
725 }
726 }
727
728 /* Iterates over the list of monitor-owned BlockDriverStates */
729 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
730 {
731 return bs ? QTAILQ_NEXT(bs, monitor_list)
732 : QTAILQ_FIRST(&monitor_bdrv_states);
733 }
734
735 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
736 Error **errp)
737 {
738 const char *value;
739
740 value = qemu_opt_get(opts, from);
741 if (value) {
742 if (qemu_opt_find(opts, to)) {
743 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
744 "same time", to, from);
745 return;
746 }
747 }
748
749 /* rename all items in opts */
750 while ((value = qemu_opt_get(opts, from))) {
751 qemu_opt_set(opts, to, value, &error_abort);
752 qemu_opt_unset(opts, from);
753 }
754 }
755
756 QemuOptsList qemu_legacy_drive_opts = {
757 .name = "drive",
758 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
759 .desc = {
760 {
761 .name = "bus",
762 .type = QEMU_OPT_NUMBER,
763 .help = "bus number",
764 },{
765 .name = "unit",
766 .type = QEMU_OPT_NUMBER,
767 .help = "unit number (i.e. lun for scsi)",
768 },{
769 .name = "index",
770 .type = QEMU_OPT_NUMBER,
771 .help = "index number",
772 },{
773 .name = "media",
774 .type = QEMU_OPT_STRING,
775 .help = "media type (disk, cdrom)",
776 },{
777 .name = "if",
778 .type = QEMU_OPT_STRING,
779 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
780 },{
781 .name = "cyls",
782 .type = QEMU_OPT_NUMBER,
783 .help = "number of cylinders (ide disk geometry)",
784 },{
785 .name = "heads",
786 .type = QEMU_OPT_NUMBER,
787 .help = "number of heads (ide disk geometry)",
788 },{
789 .name = "secs",
790 .type = QEMU_OPT_NUMBER,
791 .help = "number of sectors (ide disk geometry)",
792 },{
793 .name = "trans",
794 .type = QEMU_OPT_STRING,
795 .help = "chs translation (auto, lba, none)",
796 },{
797 .name = "boot",
798 .type = QEMU_OPT_BOOL,
799 .help = "(deprecated, ignored)",
800 },{
801 .name = "addr",
802 .type = QEMU_OPT_STRING,
803 .help = "pci address (virtio only)",
804 },{
805 .name = "serial",
806 .type = QEMU_OPT_STRING,
807 .help = "disk serial number",
808 },{
809 .name = "file",
810 .type = QEMU_OPT_STRING,
811 .help = "file name",
812 },
813
814 /* Options that are passed on, but have special semantics with -drive */
815 {
816 .name = "read-only",
817 .type = QEMU_OPT_BOOL,
818 .help = "open drive file as read-only",
819 },{
820 .name = "rerror",
821 .type = QEMU_OPT_STRING,
822 .help = "read error action",
823 },{
824 .name = "werror",
825 .type = QEMU_OPT_STRING,
826 .help = "write error action",
827 },{
828 .name = "copy-on-read",
829 .type = QEMU_OPT_BOOL,
830 .help = "copy read data from backing file into image file",
831 },
832
833 { /* end of list */ }
834 },
835 };
836
837 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
838 {
839 const char *value;
840 BlockBackend *blk;
841 DriveInfo *dinfo = NULL;
842 QDict *bs_opts;
843 QemuOpts *legacy_opts;
844 DriveMediaType media = MEDIA_DISK;
845 BlockInterfaceType type;
846 int cyls, heads, secs, translation;
847 int max_devs, bus_id, unit_id, index;
848 const char *devaddr;
849 const char *werror, *rerror;
850 bool read_only = false;
851 bool copy_on_read;
852 const char *serial;
853 const char *filename;
854 Error *local_err = NULL;
855 int i;
856
857 /* Change legacy command line options into QMP ones */
858 static const struct {
859 const char *from;
860 const char *to;
861 } opt_renames[] = {
862 { "iops", "throttling.iops-total" },
863 { "iops_rd", "throttling.iops-read" },
864 { "iops_wr", "throttling.iops-write" },
865
866 { "bps", "throttling.bps-total" },
867 { "bps_rd", "throttling.bps-read" },
868 { "bps_wr", "throttling.bps-write" },
869
870 { "iops_max", "throttling.iops-total-max" },
871 { "iops_rd_max", "throttling.iops-read-max" },
872 { "iops_wr_max", "throttling.iops-write-max" },
873
874 { "bps_max", "throttling.bps-total-max" },
875 { "bps_rd_max", "throttling.bps-read-max" },
876 { "bps_wr_max", "throttling.bps-write-max" },
877
878 { "iops_size", "throttling.iops-size" },
879
880 { "group", "throttling.group" },
881
882 { "readonly", "read-only" },
883 };
884
885 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
886 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
887 &local_err);
888 if (local_err) {
889 error_report_err(local_err);
890 return NULL;
891 }
892 }
893
894 value = qemu_opt_get(all_opts, "cache");
895 if (value) {
896 int flags = 0;
897
898 if (bdrv_parse_cache_flags(value, &flags) != 0) {
899 error_report("invalid cache option");
900 return NULL;
901 }
902
903 /* Specific options take precedence */
904 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
905 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
906 !!(flags & BDRV_O_CACHE_WB), &error_abort);
907 }
908 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
909 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
910 !!(flags & BDRV_O_NOCACHE), &error_abort);
911 }
912 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
913 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
914 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
915 }
916 qemu_opt_unset(all_opts, "cache");
917 }
918
919 /* Get a QDict for processing the options */
920 bs_opts = qdict_new();
921 qemu_opts_to_qdict(all_opts, bs_opts);
922
923 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
924 &error_abort);
925 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
926 if (local_err) {
927 error_report_err(local_err);
928 goto fail;
929 }
930
931 /* Deprecated option boot=[on|off] */
932 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
933 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
934 "ignored. Future versions will reject this parameter. Please "
935 "update your scripts.\n");
936 }
937
938 /* Media type */
939 value = qemu_opt_get(legacy_opts, "media");
940 if (value) {
941 if (!strcmp(value, "disk")) {
942 media = MEDIA_DISK;
943 } else if (!strcmp(value, "cdrom")) {
944 media = MEDIA_CDROM;
945 read_only = true;
946 } else {
947 error_report("'%s' invalid media", value);
948 goto fail;
949 }
950 }
951
952 /* copy-on-read is disabled with a warning for read-only devices */
953 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
954 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
955
956 if (read_only && copy_on_read) {
957 error_report("warning: disabling copy-on-read on read-only drive");
958 copy_on_read = false;
959 }
960
961 qdict_put(bs_opts, "read-only",
962 qstring_from_str(read_only ? "on" : "off"));
963 qdict_put(bs_opts, "copy-on-read",
964 qstring_from_str(copy_on_read ? "on" :"off"));
965
966 /* Controller type */
967 value = qemu_opt_get(legacy_opts, "if");
968 if (value) {
969 for (type = 0;
970 type < IF_COUNT && strcmp(value, if_name[type]);
971 type++) {
972 }
973 if (type == IF_COUNT) {
974 error_report("unsupported bus type '%s'", value);
975 goto fail;
976 }
977 } else {
978 type = block_default_type;
979 }
980
981 /* Geometry */
982 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
983 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
984 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
985
986 if (cyls || heads || secs) {
987 if (cyls < 1) {
988 error_report("invalid physical cyls number");
989 goto fail;
990 }
991 if (heads < 1) {
992 error_report("invalid physical heads number");
993 goto fail;
994 }
995 if (secs < 1) {
996 error_report("invalid physical secs number");
997 goto fail;
998 }
999 }
1000
1001 translation = BIOS_ATA_TRANSLATION_AUTO;
1002 value = qemu_opt_get(legacy_opts, "trans");
1003 if (value != NULL) {
1004 if (!cyls) {
1005 error_report("'%s' trans must be used with cyls, heads and secs",
1006 value);
1007 goto fail;
1008 }
1009 if (!strcmp(value, "none")) {
1010 translation = BIOS_ATA_TRANSLATION_NONE;
1011 } else if (!strcmp(value, "lba")) {
1012 translation = BIOS_ATA_TRANSLATION_LBA;
1013 } else if (!strcmp(value, "large")) {
1014 translation = BIOS_ATA_TRANSLATION_LARGE;
1015 } else if (!strcmp(value, "rechs")) {
1016 translation = BIOS_ATA_TRANSLATION_RECHS;
1017 } else if (!strcmp(value, "auto")) {
1018 translation = BIOS_ATA_TRANSLATION_AUTO;
1019 } else {
1020 error_report("'%s' invalid translation type", value);
1021 goto fail;
1022 }
1023 }
1024
1025 if (media == MEDIA_CDROM) {
1026 if (cyls || secs || heads) {
1027 error_report("CHS can't be set with media=cdrom");
1028 goto fail;
1029 }
1030 }
1031
1032 /* Device address specified by bus/unit or index.
1033 * If none was specified, try to find the first free one. */
1034 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
1035 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
1036 index = qemu_opt_get_number(legacy_opts, "index", -1);
1037
1038 max_devs = if_max_devs[type];
1039
1040 if (index != -1) {
1041 if (bus_id != 0 || unit_id != -1) {
1042 error_report("index cannot be used with bus and unit");
1043 goto fail;
1044 }
1045 bus_id = drive_index_to_bus_id(type, index);
1046 unit_id = drive_index_to_unit_id(type, index);
1047 }
1048
1049 if (unit_id == -1) {
1050 unit_id = 0;
1051 while (drive_get(type, bus_id, unit_id) != NULL) {
1052 unit_id++;
1053 if (max_devs && unit_id >= max_devs) {
1054 unit_id -= max_devs;
1055 bus_id++;
1056 }
1057 }
1058 }
1059
1060 if (max_devs && unit_id >= max_devs) {
1061 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1062 goto fail;
1063 }
1064
1065 if (drive_get(type, bus_id, unit_id) != NULL) {
1066 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1067 bus_id, unit_id, index);
1068 goto fail;
1069 }
1070
1071 /* Serial number */
1072 serial = qemu_opt_get(legacy_opts, "serial");
1073
1074 /* no id supplied -> create one */
1075 if (qemu_opts_id(all_opts) == NULL) {
1076 char *new_id;
1077 const char *mediastr = "";
1078 if (type == IF_IDE || type == IF_SCSI) {
1079 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1080 }
1081 if (max_devs) {
1082 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1083 mediastr, unit_id);
1084 } else {
1085 new_id = g_strdup_printf("%s%s%i", if_name[type],
1086 mediastr, unit_id);
1087 }
1088 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1089 g_free(new_id);
1090 }
1091
1092 /* Add virtio block device */
1093 devaddr = qemu_opt_get(legacy_opts, "addr");
1094 if (devaddr && type != IF_VIRTIO) {
1095 error_report("addr is not supported by this bus type");
1096 goto fail;
1097 }
1098
1099 if (type == IF_VIRTIO) {
1100 QemuOpts *devopts;
1101 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1102 &error_abort);
1103 if (arch_type == QEMU_ARCH_S390X) {
1104 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1105 } else {
1106 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1107 }
1108 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1109 &error_abort);
1110 if (devaddr) {
1111 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1112 }
1113 }
1114
1115 filename = qemu_opt_get(legacy_opts, "file");
1116
1117 /* Check werror/rerror compatibility with if=... */
1118 werror = qemu_opt_get(legacy_opts, "werror");
1119 if (werror != NULL) {
1120 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1121 type != IF_NONE) {
1122 error_report("werror is not supported by this bus type");
1123 goto fail;
1124 }
1125 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1126 }
1127
1128 rerror = qemu_opt_get(legacy_opts, "rerror");
1129 if (rerror != NULL) {
1130 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1131 type != IF_NONE) {
1132 error_report("rerror is not supported by this bus type");
1133 goto fail;
1134 }
1135 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1136 }
1137
1138 /* Actual block device init: Functionality shared with blockdev-add */
1139 blk = blockdev_init(filename, bs_opts, &local_err);
1140 bs_opts = NULL;
1141 if (!blk) {
1142 if (local_err) {
1143 error_report_err(local_err);
1144 }
1145 goto fail;
1146 } else {
1147 assert(!local_err);
1148 }
1149
1150 /* Create legacy DriveInfo */
1151 dinfo = g_malloc0(sizeof(*dinfo));
1152 dinfo->opts = all_opts;
1153
1154 dinfo->cyls = cyls;
1155 dinfo->heads = heads;
1156 dinfo->secs = secs;
1157 dinfo->trans = translation;
1158
1159 dinfo->type = type;
1160 dinfo->bus = bus_id;
1161 dinfo->unit = unit_id;
1162 dinfo->devaddr = devaddr;
1163 dinfo->serial = g_strdup(serial);
1164
1165 blk_set_legacy_dinfo(blk, dinfo);
1166
1167 switch(type) {
1168 case IF_IDE:
1169 case IF_SCSI:
1170 case IF_XEN:
1171 case IF_NONE:
1172 dinfo->media_cd = media == MEDIA_CDROM;
1173 break;
1174 default:
1175 break;
1176 }
1177
1178 fail:
1179 qemu_opts_del(legacy_opts);
1180 QDECREF(bs_opts);
1181 return dinfo;
1182 }
1183
1184 void hmp_commit(Monitor *mon, const QDict *qdict)
1185 {
1186 const char *device = qdict_get_str(qdict, "device");
1187 BlockBackend *blk;
1188 int ret;
1189
1190 if (!strcmp(device, "all")) {
1191 ret = blk_commit_all();
1192 } else {
1193 BlockDriverState *bs;
1194 AioContext *aio_context;
1195
1196 blk = blk_by_name(device);
1197 if (!blk) {
1198 monitor_printf(mon, "Device '%s' not found\n", device);
1199 return;
1200 }
1201 if (!blk_is_available(blk)) {
1202 monitor_printf(mon, "Device '%s' has no medium\n", device);
1203 return;
1204 }
1205
1206 bs = blk_bs(blk);
1207 aio_context = bdrv_get_aio_context(bs);
1208 aio_context_acquire(aio_context);
1209
1210 ret = bdrv_commit(bs);
1211
1212 aio_context_release(aio_context);
1213 }
1214 if (ret < 0) {
1215 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1216 strerror(-ret));
1217 }
1218 }
1219
1220 static void blockdev_do_action(TransactionAction *action, Error **errp)
1221 {
1222 TransactionActionList list;
1223
1224 list.value = action;
1225 list.next = NULL;
1226 qmp_transaction(&list, false, NULL, errp);
1227 }
1228
1229 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1230 bool has_node_name, const char *node_name,
1231 const char *snapshot_file,
1232 bool has_snapshot_node_name,
1233 const char *snapshot_node_name,
1234 bool has_format, const char *format,
1235 bool has_mode, NewImageMode mode, Error **errp)
1236 {
1237 BlockdevSnapshotSync snapshot = {
1238 .has_device = has_device,
1239 .device = (char *) device,
1240 .has_node_name = has_node_name,
1241 .node_name = (char *) node_name,
1242 .snapshot_file = (char *) snapshot_file,
1243 .has_snapshot_node_name = has_snapshot_node_name,
1244 .snapshot_node_name = (char *) snapshot_node_name,
1245 .has_format = has_format,
1246 .format = (char *) format,
1247 .has_mode = has_mode,
1248 .mode = mode,
1249 };
1250 TransactionAction action = {
1251 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1252 .u.blockdev_snapshot_sync.data = &snapshot,
1253 };
1254 blockdev_do_action(&action, errp);
1255 }
1256
1257 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1258 Error **errp)
1259 {
1260 BlockdevSnapshot snapshot_data = {
1261 .node = (char *) node,
1262 .overlay = (char *) overlay
1263 };
1264 TransactionAction action = {
1265 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1266 .u.blockdev_snapshot.data = &snapshot_data,
1267 };
1268 blockdev_do_action(&action, errp);
1269 }
1270
1271 void qmp_blockdev_snapshot_internal_sync(const char *device,
1272 const char *name,
1273 Error **errp)
1274 {
1275 BlockdevSnapshotInternal snapshot = {
1276 .device = (char *) device,
1277 .name = (char *) name
1278 };
1279 TransactionAction action = {
1280 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1281 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1282 };
1283 blockdev_do_action(&action, errp);
1284 }
1285
1286 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1287 bool has_id,
1288 const char *id,
1289 bool has_name,
1290 const char *name,
1291 Error **errp)
1292 {
1293 BlockDriverState *bs;
1294 BlockBackend *blk;
1295 AioContext *aio_context;
1296 QEMUSnapshotInfo sn;
1297 Error *local_err = NULL;
1298 SnapshotInfo *info = NULL;
1299 int ret;
1300
1301 blk = blk_by_name(device);
1302 if (!blk) {
1303 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1304 "Device '%s' not found", device);
1305 return NULL;
1306 }
1307
1308 aio_context = blk_get_aio_context(blk);
1309 aio_context_acquire(aio_context);
1310
1311 if (!has_id) {
1312 id = NULL;
1313 }
1314
1315 if (!has_name) {
1316 name = NULL;
1317 }
1318
1319 if (!id && !name) {
1320 error_setg(errp, "Name or id must be provided");
1321 goto out_aio_context;
1322 }
1323
1324 if (!blk_is_available(blk)) {
1325 error_setg(errp, "Device '%s' has no medium", device);
1326 goto out_aio_context;
1327 }
1328 bs = blk_bs(blk);
1329
1330 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1331 goto out_aio_context;
1332 }
1333
1334 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1335 if (local_err) {
1336 error_propagate(errp, local_err);
1337 goto out_aio_context;
1338 }
1339 if (!ret) {
1340 error_setg(errp,
1341 "Snapshot with id '%s' and name '%s' does not exist on "
1342 "device '%s'",
1343 STR_OR_NULL(id), STR_OR_NULL(name), device);
1344 goto out_aio_context;
1345 }
1346
1347 bdrv_snapshot_delete(bs, id, name, &local_err);
1348 if (local_err) {
1349 error_propagate(errp, local_err);
1350 goto out_aio_context;
1351 }
1352
1353 aio_context_release(aio_context);
1354
1355 info = g_new0(SnapshotInfo, 1);
1356 info->id = g_strdup(sn.id_str);
1357 info->name = g_strdup(sn.name);
1358 info->date_nsec = sn.date_nsec;
1359 info->date_sec = sn.date_sec;
1360 info->vm_state_size = sn.vm_state_size;
1361 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1362 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1363
1364 return info;
1365
1366 out_aio_context:
1367 aio_context_release(aio_context);
1368 return NULL;
1369 }
1370
1371 /**
1372 * block_dirty_bitmap_lookup:
1373 * Return a dirty bitmap (if present), after validating
1374 * the node reference and bitmap names.
1375 *
1376 * @node: The name of the BDS node to search for bitmaps
1377 * @name: The name of the bitmap to search for
1378 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1379 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1380 * @errp: Output pointer for error information. Can be NULL.
1381 *
1382 * @return: A bitmap object on success, or NULL on failure.
1383 */
1384 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1385 const char *name,
1386 BlockDriverState **pbs,
1387 AioContext **paio,
1388 Error **errp)
1389 {
1390 BlockDriverState *bs;
1391 BdrvDirtyBitmap *bitmap;
1392 AioContext *aio_context;
1393
1394 if (!node) {
1395 error_setg(errp, "Node cannot be NULL");
1396 return NULL;
1397 }
1398 if (!name) {
1399 error_setg(errp, "Bitmap name cannot be NULL");
1400 return NULL;
1401 }
1402 bs = bdrv_lookup_bs(node, node, NULL);
1403 if (!bs) {
1404 error_setg(errp, "Node '%s' not found", node);
1405 return NULL;
1406 }
1407
1408 aio_context = bdrv_get_aio_context(bs);
1409 aio_context_acquire(aio_context);
1410
1411 bitmap = bdrv_find_dirty_bitmap(bs, name);
1412 if (!bitmap) {
1413 error_setg(errp, "Dirty bitmap '%s' not found", name);
1414 goto fail;
1415 }
1416
1417 if (pbs) {
1418 *pbs = bs;
1419 }
1420 if (paio) {
1421 *paio = aio_context;
1422 } else {
1423 aio_context_release(aio_context);
1424 }
1425
1426 return bitmap;
1427
1428 fail:
1429 aio_context_release(aio_context);
1430 return NULL;
1431 }
1432
1433 /* New and old BlockDriverState structs for atomic group operations */
1434
1435 typedef struct BlkActionState BlkActionState;
1436
1437 /**
1438 * BlkActionOps:
1439 * Table of operations that define an Action.
1440 *
1441 * @instance_size: Size of state struct, in bytes.
1442 * @prepare: Prepare the work, must NOT be NULL.
1443 * @commit: Commit the changes, can be NULL.
1444 * @abort: Abort the changes on fail, can be NULL.
1445 * @clean: Clean up resources after all transaction actions have called
1446 * commit() or abort(). Can be NULL.
1447 *
1448 * Only prepare() may fail. In a single transaction, only one of commit() or
1449 * abort() will be called. clean() will always be called if it is present.
1450 */
1451 typedef struct BlkActionOps {
1452 size_t instance_size;
1453 void (*prepare)(BlkActionState *common, Error **errp);
1454 void (*commit)(BlkActionState *common);
1455 void (*abort)(BlkActionState *common);
1456 void (*clean)(BlkActionState *common);
1457 } BlkActionOps;
1458
1459 /**
1460 * BlkActionState:
1461 * Describes one Action's state within a Transaction.
1462 *
1463 * @action: QAPI-defined enum identifying which Action to perform.
1464 * @ops: Table of ActionOps this Action can perform.
1465 * @block_job_txn: Transaction which this action belongs to.
1466 * @entry: List membership for all Actions in this Transaction.
1467 *
1468 * This structure must be arranged as first member in a subclassed type,
1469 * assuming that the compiler will also arrange it to the same offsets as the
1470 * base class.
1471 */
1472 struct BlkActionState {
1473 TransactionAction *action;
1474 const BlkActionOps *ops;
1475 BlockJobTxn *block_job_txn;
1476 TransactionProperties *txn_props;
1477 QSIMPLEQ_ENTRY(BlkActionState) entry;
1478 };
1479
1480 /* internal snapshot private data */
1481 typedef struct InternalSnapshotState {
1482 BlkActionState common;
1483 BlockDriverState *bs;
1484 AioContext *aio_context;
1485 QEMUSnapshotInfo sn;
1486 bool created;
1487 } InternalSnapshotState;
1488
1489
1490 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1491 {
1492 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1493 error_setg(errp,
1494 "Action '%s' does not support Transaction property "
1495 "completion-mode = %s",
1496 TransactionActionKind_lookup[s->action->type],
1497 ActionCompletionMode_lookup[s->txn_props->completion_mode]);
1498 return -1;
1499 }
1500 return 0;
1501 }
1502
1503 static void internal_snapshot_prepare(BlkActionState *common,
1504 Error **errp)
1505 {
1506 Error *local_err = NULL;
1507 const char *device;
1508 const char *name;
1509 BlockBackend *blk;
1510 BlockDriverState *bs;
1511 QEMUSnapshotInfo old_sn, *sn;
1512 bool ret;
1513 qemu_timeval tv;
1514 BlockdevSnapshotInternal *internal;
1515 InternalSnapshotState *state;
1516 int ret1;
1517
1518 g_assert(common->action->type ==
1519 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1520 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1521 state = DO_UPCAST(InternalSnapshotState, common, common);
1522
1523 /* 1. parse input */
1524 device = internal->device;
1525 name = internal->name;
1526
1527 /* 2. check for validation */
1528 if (action_check_completion_mode(common, errp) < 0) {
1529 return;
1530 }
1531
1532 blk = blk_by_name(device);
1533 if (!blk) {
1534 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1535 "Device '%s' not found", device);
1536 return;
1537 }
1538
1539 /* AioContext is released in .clean() */
1540 state->aio_context = blk_get_aio_context(blk);
1541 aio_context_acquire(state->aio_context);
1542
1543 if (!blk_is_available(blk)) {
1544 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1545 return;
1546 }
1547 bs = blk_bs(blk);
1548
1549 state->bs = bs;
1550 bdrv_drained_begin(bs);
1551
1552 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1553 return;
1554 }
1555
1556 if (bdrv_is_read_only(bs)) {
1557 error_setg(errp, "Device '%s' is read only", device);
1558 return;
1559 }
1560
1561 if (!bdrv_can_snapshot(bs)) {
1562 error_setg(errp, "Block format '%s' used by device '%s' "
1563 "does not support internal snapshots",
1564 bs->drv->format_name, device);
1565 return;
1566 }
1567
1568 if (!strlen(name)) {
1569 error_setg(errp, "Name is empty");
1570 return;
1571 }
1572
1573 /* check whether a snapshot with name exist */
1574 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1575 &local_err);
1576 if (local_err) {
1577 error_propagate(errp, local_err);
1578 return;
1579 } else if (ret) {
1580 error_setg(errp,
1581 "Snapshot with name '%s' already exists on device '%s'",
1582 name, device);
1583 return;
1584 }
1585
1586 /* 3. take the snapshot */
1587 sn = &state->sn;
1588 pstrcpy(sn->name, sizeof(sn->name), name);
1589 qemu_gettimeofday(&tv);
1590 sn->date_sec = tv.tv_sec;
1591 sn->date_nsec = tv.tv_usec * 1000;
1592 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1593
1594 ret1 = bdrv_snapshot_create(bs, sn);
1595 if (ret1 < 0) {
1596 error_setg_errno(errp, -ret1,
1597 "Failed to create snapshot '%s' on device '%s'",
1598 name, device);
1599 return;
1600 }
1601
1602 /* 4. succeed, mark a snapshot is created */
1603 state->created = true;
1604 }
1605
1606 static void internal_snapshot_abort(BlkActionState *common)
1607 {
1608 InternalSnapshotState *state =
1609 DO_UPCAST(InternalSnapshotState, common, common);
1610 BlockDriverState *bs = state->bs;
1611 QEMUSnapshotInfo *sn = &state->sn;
1612 Error *local_error = NULL;
1613
1614 if (!state->created) {
1615 return;
1616 }
1617
1618 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1619 error_reportf_err(local_error,
1620 "Failed to delete snapshot with id '%s' and "
1621 "name '%s' on device '%s' in abort: ",
1622 sn->id_str, sn->name,
1623 bdrv_get_device_name(bs));
1624 }
1625 }
1626
1627 static void internal_snapshot_clean(BlkActionState *common)
1628 {
1629 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1630 common, common);
1631
1632 if (state->aio_context) {
1633 if (state->bs) {
1634 bdrv_drained_end(state->bs);
1635 }
1636 aio_context_release(state->aio_context);
1637 }
1638 }
1639
1640 /* external snapshot private data */
1641 typedef struct ExternalSnapshotState {
1642 BlkActionState common;
1643 BlockDriverState *old_bs;
1644 BlockDriverState *new_bs;
1645 AioContext *aio_context;
1646 } ExternalSnapshotState;
1647
1648 static void external_snapshot_prepare(BlkActionState *common,
1649 Error **errp)
1650 {
1651 int flags = 0, ret;
1652 QDict *options = NULL;
1653 Error *local_err = NULL;
1654 /* Device and node name of the image to generate the snapshot from */
1655 const char *device;
1656 const char *node_name;
1657 /* Reference to the new image (for 'blockdev-snapshot') */
1658 const char *snapshot_ref;
1659 /* File name of the new image (for 'blockdev-snapshot-sync') */
1660 const char *new_image_file;
1661 ExternalSnapshotState *state =
1662 DO_UPCAST(ExternalSnapshotState, common, common);
1663 TransactionAction *action = common->action;
1664
1665 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1666 * purpose but a different set of parameters */
1667 switch (action->type) {
1668 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1669 {
1670 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1671 device = s->node;
1672 node_name = s->node;
1673 new_image_file = NULL;
1674 snapshot_ref = s->overlay;
1675 }
1676 break;
1677 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1678 {
1679 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1680 device = s->has_device ? s->device : NULL;
1681 node_name = s->has_node_name ? s->node_name : NULL;
1682 new_image_file = s->snapshot_file;
1683 snapshot_ref = NULL;
1684 }
1685 break;
1686 default:
1687 g_assert_not_reached();
1688 }
1689
1690 /* start processing */
1691 if (action_check_completion_mode(common, errp) < 0) {
1692 return;
1693 }
1694
1695 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1696 if (!state->old_bs) {
1697 return;
1698 }
1699
1700 /* Acquire AioContext now so any threads operating on old_bs stop */
1701 state->aio_context = bdrv_get_aio_context(state->old_bs);
1702 aio_context_acquire(state->aio_context);
1703 bdrv_drained_begin(state->old_bs);
1704
1705 if (!bdrv_is_inserted(state->old_bs)) {
1706 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1707 return;
1708 }
1709
1710 if (bdrv_op_is_blocked(state->old_bs,
1711 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1712 return;
1713 }
1714
1715 if (!bdrv_is_read_only(state->old_bs)) {
1716 if (bdrv_flush(state->old_bs)) {
1717 error_setg(errp, QERR_IO_ERROR);
1718 return;
1719 }
1720 }
1721
1722 if (!bdrv_is_first_non_filter(state->old_bs)) {
1723 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1724 return;
1725 }
1726
1727 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1728 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1729 const char *format = s->has_format ? s->format : "qcow2";
1730 enum NewImageMode mode;
1731 const char *snapshot_node_name =
1732 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1733
1734 if (node_name && !snapshot_node_name) {
1735 error_setg(errp, "New snapshot node name missing");
1736 return;
1737 }
1738
1739 if (snapshot_node_name &&
1740 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1741 error_setg(errp, "New snapshot node name already in use");
1742 return;
1743 }
1744
1745 flags = state->old_bs->open_flags;
1746
1747 /* create new image w/backing file */
1748 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1749 if (mode != NEW_IMAGE_MODE_EXISTING) {
1750 int64_t size = bdrv_getlength(state->old_bs);
1751 if (size < 0) {
1752 error_setg_errno(errp, -size, "bdrv_getlength failed");
1753 return;
1754 }
1755 bdrv_img_create(new_image_file, format,
1756 state->old_bs->filename,
1757 state->old_bs->drv->format_name,
1758 NULL, size, flags, &local_err, false);
1759 if (local_err) {
1760 error_propagate(errp, local_err);
1761 return;
1762 }
1763 }
1764
1765 options = qdict_new();
1766 if (s->has_snapshot_node_name) {
1767 qdict_put(options, "node-name",
1768 qstring_from_str(snapshot_node_name));
1769 }
1770 qdict_put(options, "driver", qstring_from_str(format));
1771
1772 flags |= BDRV_O_NO_BACKING;
1773 }
1774
1775 assert(state->new_bs == NULL);
1776 ret = bdrv_open(&state->new_bs, new_image_file, snapshot_ref, options,
1777 flags, errp);
1778 /* We will manually add the backing_hd field to the bs later */
1779 if (ret != 0) {
1780 return;
1781 }
1782
1783 if (state->new_bs->blk != NULL) {
1784 error_setg(errp, "The snapshot is already in use by %s",
1785 blk_name(state->new_bs->blk));
1786 return;
1787 }
1788
1789 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1790 errp)) {
1791 return;
1792 }
1793
1794 if (state->new_bs->backing != NULL) {
1795 error_setg(errp, "The snapshot already has a backing image");
1796 return;
1797 }
1798
1799 if (!state->new_bs->drv->supports_backing) {
1800 error_setg(errp, "The snapshot does not support backing images");
1801 }
1802 }
1803
1804 static void external_snapshot_commit(BlkActionState *common)
1805 {
1806 ExternalSnapshotState *state =
1807 DO_UPCAST(ExternalSnapshotState, common, common);
1808
1809 bdrv_set_aio_context(state->new_bs, state->aio_context);
1810
1811 /* This removes our old bs and adds the new bs */
1812 bdrv_append(state->new_bs, state->old_bs);
1813 /* We don't need (or want) to use the transactional
1814 * bdrv_reopen_multiple() across all the entries at once, because we
1815 * don't want to abort all of them if one of them fails the reopen */
1816 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1817 NULL);
1818 }
1819
1820 static void external_snapshot_abort(BlkActionState *common)
1821 {
1822 ExternalSnapshotState *state =
1823 DO_UPCAST(ExternalSnapshotState, common, common);
1824 if (state->new_bs) {
1825 bdrv_unref(state->new_bs);
1826 }
1827 }
1828
1829 static void external_snapshot_clean(BlkActionState *common)
1830 {
1831 ExternalSnapshotState *state =
1832 DO_UPCAST(ExternalSnapshotState, common, common);
1833 if (state->aio_context) {
1834 bdrv_drained_end(state->old_bs);
1835 aio_context_release(state->aio_context);
1836 }
1837 }
1838
1839 typedef struct DriveBackupState {
1840 BlkActionState common;
1841 BlockDriverState *bs;
1842 AioContext *aio_context;
1843 BlockJob *job;
1844 } DriveBackupState;
1845
1846 static void do_drive_backup(const char *device, const char *target,
1847 bool has_format, const char *format,
1848 enum MirrorSyncMode sync,
1849 bool has_mode, enum NewImageMode mode,
1850 bool has_speed, int64_t speed,
1851 bool has_bitmap, const char *bitmap,
1852 bool has_on_source_error,
1853 BlockdevOnError on_source_error,
1854 bool has_on_target_error,
1855 BlockdevOnError on_target_error,
1856 BlockJobTxn *txn, Error **errp);
1857
1858 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1859 {
1860 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1861 BlockBackend *blk;
1862 DriveBackup *backup;
1863 Error *local_err = NULL;
1864
1865 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1866 backup = common->action->u.drive_backup.data;
1867
1868 blk = blk_by_name(backup->device);
1869 if (!blk) {
1870 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1871 "Device '%s' not found", backup->device);
1872 return;
1873 }
1874
1875 if (!blk_is_available(blk)) {
1876 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1877 return;
1878 }
1879
1880 /* AioContext is released in .clean() */
1881 state->aio_context = blk_get_aio_context(blk);
1882 aio_context_acquire(state->aio_context);
1883 bdrv_drained_begin(blk_bs(blk));
1884 state->bs = blk_bs(blk);
1885
1886 do_drive_backup(backup->device, backup->target,
1887 backup->has_format, backup->format,
1888 backup->sync,
1889 backup->has_mode, backup->mode,
1890 backup->has_speed, backup->speed,
1891 backup->has_bitmap, backup->bitmap,
1892 backup->has_on_source_error, backup->on_source_error,
1893 backup->has_on_target_error, backup->on_target_error,
1894 common->block_job_txn, &local_err);
1895 if (local_err) {
1896 error_propagate(errp, local_err);
1897 return;
1898 }
1899
1900 state->job = state->bs->job;
1901 }
1902
1903 static void drive_backup_abort(BlkActionState *common)
1904 {
1905 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1906 BlockDriverState *bs = state->bs;
1907
1908 /* Only cancel if it's the job we started */
1909 if (bs && bs->job && bs->job == state->job) {
1910 block_job_cancel_sync(bs->job);
1911 }
1912 }
1913
1914 static void drive_backup_clean(BlkActionState *common)
1915 {
1916 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1917
1918 if (state->aio_context) {
1919 bdrv_drained_end(state->bs);
1920 aio_context_release(state->aio_context);
1921 }
1922 }
1923
1924 typedef struct BlockdevBackupState {
1925 BlkActionState common;
1926 BlockDriverState *bs;
1927 BlockJob *job;
1928 AioContext *aio_context;
1929 } BlockdevBackupState;
1930
1931 static void do_blockdev_backup(const char *device, const char *target,
1932 enum MirrorSyncMode sync,
1933 bool has_speed, int64_t speed,
1934 bool has_on_source_error,
1935 BlockdevOnError on_source_error,
1936 bool has_on_target_error,
1937 BlockdevOnError on_target_error,
1938 BlockJobTxn *txn, Error **errp);
1939
1940 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1941 {
1942 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1943 BlockdevBackup *backup;
1944 BlockBackend *blk, *target;
1945 Error *local_err = NULL;
1946
1947 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1948 backup = common->action->u.blockdev_backup.data;
1949
1950 blk = blk_by_name(backup->device);
1951 if (!blk) {
1952 error_setg(errp, "Device '%s' not found", backup->device);
1953 return;
1954 }
1955
1956 if (!blk_is_available(blk)) {
1957 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1958 return;
1959 }
1960
1961 target = blk_by_name(backup->target);
1962 if (!target) {
1963 error_setg(errp, "Device '%s' not found", backup->target);
1964 return;
1965 }
1966
1967 /* AioContext is released in .clean() */
1968 state->aio_context = blk_get_aio_context(blk);
1969 if (state->aio_context != blk_get_aio_context(target)) {
1970 state->aio_context = NULL;
1971 error_setg(errp, "Backup between two IO threads is not implemented");
1972 return;
1973 }
1974 aio_context_acquire(state->aio_context);
1975 state->bs = blk_bs(blk);
1976 bdrv_drained_begin(state->bs);
1977
1978 do_blockdev_backup(backup->device, backup->target,
1979 backup->sync,
1980 backup->has_speed, backup->speed,
1981 backup->has_on_source_error, backup->on_source_error,
1982 backup->has_on_target_error, backup->on_target_error,
1983 common->block_job_txn, &local_err);
1984 if (local_err) {
1985 error_propagate(errp, local_err);
1986 return;
1987 }
1988
1989 state->job = state->bs->job;
1990 }
1991
1992 static void blockdev_backup_abort(BlkActionState *common)
1993 {
1994 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1995 BlockDriverState *bs = state->bs;
1996
1997 /* Only cancel if it's the job we started */
1998 if (bs && bs->job && bs->job == state->job) {
1999 block_job_cancel_sync(bs->job);
2000 }
2001 }
2002
2003 static void blockdev_backup_clean(BlkActionState *common)
2004 {
2005 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2006
2007 if (state->aio_context) {
2008 bdrv_drained_end(state->bs);
2009 aio_context_release(state->aio_context);
2010 }
2011 }
2012
2013 typedef struct BlockDirtyBitmapState {
2014 BlkActionState common;
2015 BdrvDirtyBitmap *bitmap;
2016 BlockDriverState *bs;
2017 AioContext *aio_context;
2018 HBitmap *backup;
2019 bool prepared;
2020 } BlockDirtyBitmapState;
2021
2022 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2023 Error **errp)
2024 {
2025 Error *local_err = NULL;
2026 BlockDirtyBitmapAdd *action;
2027 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2028 common, common);
2029
2030 if (action_check_completion_mode(common, errp) < 0) {
2031 return;
2032 }
2033
2034 action = common->action->u.block_dirty_bitmap_add.data;
2035 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2036 qmp_block_dirty_bitmap_add(action->node, action->name,
2037 action->has_granularity, action->granularity,
2038 &local_err);
2039
2040 if (!local_err) {
2041 state->prepared = true;
2042 } else {
2043 error_propagate(errp, local_err);
2044 }
2045 }
2046
2047 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2048 {
2049 BlockDirtyBitmapAdd *action;
2050 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2051 common, common);
2052
2053 action = common->action->u.block_dirty_bitmap_add.data;
2054 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2055 * then the node reference and bitmap name must have been valid.
2056 */
2057 if (state->prepared) {
2058 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2059 }
2060 }
2061
2062 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2063 Error **errp)
2064 {
2065 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2066 common, common);
2067 BlockDirtyBitmap *action;
2068
2069 if (action_check_completion_mode(common, errp) < 0) {
2070 return;
2071 }
2072
2073 action = common->action->u.block_dirty_bitmap_clear.data;
2074 state->bitmap = block_dirty_bitmap_lookup(action->node,
2075 action->name,
2076 &state->bs,
2077 &state->aio_context,
2078 errp);
2079 if (!state->bitmap) {
2080 return;
2081 }
2082
2083 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2084 error_setg(errp, "Cannot modify a frozen bitmap");
2085 return;
2086 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2087 error_setg(errp, "Cannot clear a disabled bitmap");
2088 return;
2089 }
2090
2091 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2092 /* AioContext is released in .clean() */
2093 }
2094
2095 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2096 {
2097 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2098 common, common);
2099
2100 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2101 }
2102
2103 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2104 {
2105 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2106 common, common);
2107
2108 hbitmap_free(state->backup);
2109 }
2110
2111 static void block_dirty_bitmap_clear_clean(BlkActionState *common)
2112 {
2113 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2114 common, common);
2115
2116 if (state->aio_context) {
2117 aio_context_release(state->aio_context);
2118 }
2119 }
2120
2121 static void abort_prepare(BlkActionState *common, Error **errp)
2122 {
2123 error_setg(errp, "Transaction aborted using Abort action");
2124 }
2125
2126 static void abort_commit(BlkActionState *common)
2127 {
2128 g_assert_not_reached(); /* this action never succeeds */
2129 }
2130
2131 static const BlkActionOps actions[] = {
2132 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2133 .instance_size = sizeof(ExternalSnapshotState),
2134 .prepare = external_snapshot_prepare,
2135 .commit = external_snapshot_commit,
2136 .abort = external_snapshot_abort,
2137 .clean = external_snapshot_clean,
2138 },
2139 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2140 .instance_size = sizeof(ExternalSnapshotState),
2141 .prepare = external_snapshot_prepare,
2142 .commit = external_snapshot_commit,
2143 .abort = external_snapshot_abort,
2144 .clean = external_snapshot_clean,
2145 },
2146 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2147 .instance_size = sizeof(DriveBackupState),
2148 .prepare = drive_backup_prepare,
2149 .abort = drive_backup_abort,
2150 .clean = drive_backup_clean,
2151 },
2152 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2153 .instance_size = sizeof(BlockdevBackupState),
2154 .prepare = blockdev_backup_prepare,
2155 .abort = blockdev_backup_abort,
2156 .clean = blockdev_backup_clean,
2157 },
2158 [TRANSACTION_ACTION_KIND_ABORT] = {
2159 .instance_size = sizeof(BlkActionState),
2160 .prepare = abort_prepare,
2161 .commit = abort_commit,
2162 },
2163 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2164 .instance_size = sizeof(InternalSnapshotState),
2165 .prepare = internal_snapshot_prepare,
2166 .abort = internal_snapshot_abort,
2167 .clean = internal_snapshot_clean,
2168 },
2169 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2170 .instance_size = sizeof(BlockDirtyBitmapState),
2171 .prepare = block_dirty_bitmap_add_prepare,
2172 .abort = block_dirty_bitmap_add_abort,
2173 },
2174 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2175 .instance_size = sizeof(BlockDirtyBitmapState),
2176 .prepare = block_dirty_bitmap_clear_prepare,
2177 .commit = block_dirty_bitmap_clear_commit,
2178 .abort = block_dirty_bitmap_clear_abort,
2179 .clean = block_dirty_bitmap_clear_clean,
2180 }
2181 };
2182
2183 /**
2184 * Allocate a TransactionProperties structure if necessary, and fill
2185 * that structure with desired defaults if they are unset.
2186 */
2187 static TransactionProperties *get_transaction_properties(
2188 TransactionProperties *props)
2189 {
2190 if (!props) {
2191 props = g_new0(TransactionProperties, 1);
2192 }
2193
2194 if (!props->has_completion_mode) {
2195 props->has_completion_mode = true;
2196 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2197 }
2198
2199 return props;
2200 }
2201
2202 /*
2203 * 'Atomic' group operations. The operations are performed as a set, and if
2204 * any fail then we roll back all operations in the group.
2205 */
2206 void qmp_transaction(TransactionActionList *dev_list,
2207 bool has_props,
2208 struct TransactionProperties *props,
2209 Error **errp)
2210 {
2211 TransactionActionList *dev_entry = dev_list;
2212 BlockJobTxn *block_job_txn = NULL;
2213 BlkActionState *state, *next;
2214 Error *local_err = NULL;
2215
2216 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2217 QSIMPLEQ_INIT(&snap_bdrv_states);
2218
2219 /* Does this transaction get canceled as a group on failure?
2220 * If not, we don't really need to make a BlockJobTxn.
2221 */
2222 props = get_transaction_properties(props);
2223 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2224 block_job_txn = block_job_txn_new();
2225 }
2226
2227 /* drain all i/o before any operations */
2228 bdrv_drain_all();
2229
2230 /* We don't do anything in this loop that commits us to the operations */
2231 while (NULL != dev_entry) {
2232 TransactionAction *dev_info = NULL;
2233 const BlkActionOps *ops;
2234
2235 dev_info = dev_entry->value;
2236 dev_entry = dev_entry->next;
2237
2238 assert(dev_info->type < ARRAY_SIZE(actions));
2239
2240 ops = &actions[dev_info->type];
2241 assert(ops->instance_size > 0);
2242
2243 state = g_malloc0(ops->instance_size);
2244 state->ops = ops;
2245 state->action = dev_info;
2246 state->block_job_txn = block_job_txn;
2247 state->txn_props = props;
2248 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2249
2250 state->ops->prepare(state, &local_err);
2251 if (local_err) {
2252 error_propagate(errp, local_err);
2253 goto delete_and_fail;
2254 }
2255 }
2256
2257 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2258 if (state->ops->commit) {
2259 state->ops->commit(state);
2260 }
2261 }
2262
2263 /* success */
2264 goto exit;
2265
2266 delete_and_fail:
2267 /* failure, and it is all-or-none; roll back all operations */
2268 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2269 if (state->ops->abort) {
2270 state->ops->abort(state);
2271 }
2272 }
2273 exit:
2274 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2275 if (state->ops->clean) {
2276 state->ops->clean(state);
2277 }
2278 g_free(state);
2279 }
2280 if (!has_props) {
2281 qapi_free_TransactionProperties(props);
2282 }
2283 block_job_txn_unref(block_job_txn);
2284 }
2285
2286 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
2287 {
2288 Error *local_err = NULL;
2289
2290 qmp_blockdev_open_tray(device, has_force, force, &local_err);
2291 if (local_err) {
2292 error_propagate(errp, local_err);
2293 return;
2294 }
2295
2296 qmp_x_blockdev_remove_medium(device, errp);
2297 }
2298
2299 void qmp_block_passwd(bool has_device, const char *device,
2300 bool has_node_name, const char *node_name,
2301 const char *password, Error **errp)
2302 {
2303 Error *local_err = NULL;
2304 BlockDriverState *bs;
2305 AioContext *aio_context;
2306
2307 bs = bdrv_lookup_bs(has_device ? device : NULL,
2308 has_node_name ? node_name : NULL,
2309 &local_err);
2310 if (local_err) {
2311 error_propagate(errp, local_err);
2312 return;
2313 }
2314
2315 aio_context = bdrv_get_aio_context(bs);
2316 aio_context_acquire(aio_context);
2317
2318 bdrv_add_key(bs, password, errp);
2319
2320 aio_context_release(aio_context);
2321 }
2322
2323 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force,
2324 Error **errp)
2325 {
2326 BlockBackend *blk;
2327 bool locked;
2328
2329 if (!has_force) {
2330 force = false;
2331 }
2332
2333 blk = blk_by_name(device);
2334 if (!blk) {
2335 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2336 "Device '%s' not found", device);
2337 return;
2338 }
2339
2340 if (!blk_dev_has_removable_media(blk)) {
2341 error_setg(errp, "Device '%s' is not removable", device);
2342 return;
2343 }
2344
2345 if (!blk_dev_has_tray(blk)) {
2346 /* Ignore this command on tray-less devices */
2347 return;
2348 }
2349
2350 if (blk_dev_is_tray_open(blk)) {
2351 return;
2352 }
2353
2354 locked = blk_dev_is_medium_locked(blk);
2355 if (locked) {
2356 blk_dev_eject_request(blk, force);
2357 }
2358
2359 if (!locked || force) {
2360 blk_dev_change_media_cb(blk, false);
2361 }
2362 }
2363
2364 void qmp_blockdev_close_tray(const char *device, Error **errp)
2365 {
2366 BlockBackend *blk;
2367
2368 blk = blk_by_name(device);
2369 if (!blk) {
2370 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2371 "Device '%s' not found", device);
2372 return;
2373 }
2374
2375 if (!blk_dev_has_removable_media(blk)) {
2376 error_setg(errp, "Device '%s' is not removable", device);
2377 return;
2378 }
2379
2380 if (!blk_dev_has_tray(blk)) {
2381 /* Ignore this command on tray-less devices */
2382 return;
2383 }
2384
2385 if (!blk_dev_is_tray_open(blk)) {
2386 return;
2387 }
2388
2389 blk_dev_change_media_cb(blk, true);
2390 }
2391
2392 void qmp_x_blockdev_remove_medium(const char *device, Error **errp)
2393 {
2394 BlockBackend *blk;
2395 BlockDriverState *bs;
2396 AioContext *aio_context;
2397 bool has_device;
2398
2399 blk = blk_by_name(device);
2400 if (!blk) {
2401 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2402 "Device '%s' not found", device);
2403 return;
2404 }
2405
2406 /* For BBs without a device, we can exchange the BDS tree at will */
2407 has_device = blk_get_attached_dev(blk);
2408
2409 if (has_device && !blk_dev_has_removable_media(blk)) {
2410 error_setg(errp, "Device '%s' is not removable", device);
2411 return;
2412 }
2413
2414 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2415 error_setg(errp, "Tray of device '%s' is not open", device);
2416 return;
2417 }
2418
2419 bs = blk_bs(blk);
2420 if (!bs) {
2421 return;
2422 }
2423
2424 aio_context = bdrv_get_aio_context(bs);
2425 aio_context_acquire(aio_context);
2426
2427 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2428 goto out;
2429 }
2430
2431 blk_remove_bs(blk);
2432
2433 if (!blk_dev_has_tray(blk)) {
2434 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2435 * called at all); therefore, the medium needs to be ejected here.
2436 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2437 * value passed here (i.e. false). */
2438 blk_dev_change_media_cb(blk, false);
2439 }
2440
2441 out:
2442 aio_context_release(aio_context);
2443 }
2444
2445 static void qmp_blockdev_insert_anon_medium(const char *device,
2446 BlockDriverState *bs, Error **errp)
2447 {
2448 BlockBackend *blk;
2449 bool has_device;
2450
2451 blk = blk_by_name(device);
2452 if (!blk) {
2453 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2454 "Device '%s' not found", device);
2455 return;
2456 }
2457
2458 /* For BBs without a device, we can exchange the BDS tree at will */
2459 has_device = blk_get_attached_dev(blk);
2460
2461 if (has_device && !blk_dev_has_removable_media(blk)) {
2462 error_setg(errp, "Device '%s' is not removable", device);
2463 return;
2464 }
2465
2466 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2467 error_setg(errp, "Tray of device '%s' is not open", device);
2468 return;
2469 }
2470
2471 if (blk_bs(blk)) {
2472 error_setg(errp, "There already is a medium in device '%s'", device);
2473 return;
2474 }
2475
2476 blk_insert_bs(blk, bs);
2477
2478 if (!blk_dev_has_tray(blk)) {
2479 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2480 * called at all); therefore, the medium needs to be pushed into the
2481 * slot here.
2482 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2483 * value passed here (i.e. true). */
2484 blk_dev_change_media_cb(blk, true);
2485 }
2486 }
2487
2488 void qmp_x_blockdev_insert_medium(const char *device, const char *node_name,
2489 Error **errp)
2490 {
2491 BlockDriverState *bs;
2492
2493 bs = bdrv_find_node(node_name);
2494 if (!bs) {
2495 error_setg(errp, "Node '%s' not found", node_name);
2496 return;
2497 }
2498
2499 if (bs->blk) {
2500 error_setg(errp, "Node '%s' is already in use by '%s'", node_name,
2501 blk_name(bs->blk));
2502 return;
2503 }
2504
2505 qmp_blockdev_insert_anon_medium(device, bs, errp);
2506 }
2507
2508 void qmp_blockdev_change_medium(const char *device, const char *filename,
2509 bool has_format, const char *format,
2510 bool has_read_only,
2511 BlockdevChangeReadOnlyMode read_only,
2512 Error **errp)
2513 {
2514 BlockBackend *blk;
2515 BlockDriverState *medium_bs = NULL;
2516 int bdrv_flags, ret;
2517 QDict *options = NULL;
2518 Error *err = NULL;
2519
2520 blk = blk_by_name(device);
2521 if (!blk) {
2522 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2523 "Device '%s' not found", device);
2524 goto fail;
2525 }
2526
2527 if (blk_bs(blk)) {
2528 blk_update_root_state(blk);
2529 }
2530
2531 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2532 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2533 BDRV_O_PROTOCOL);
2534
2535 if (!has_read_only) {
2536 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2537 }
2538
2539 switch (read_only) {
2540 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2541 break;
2542
2543 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2544 bdrv_flags &= ~BDRV_O_RDWR;
2545 break;
2546
2547 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2548 bdrv_flags |= BDRV_O_RDWR;
2549 break;
2550
2551 default:
2552 abort();
2553 }
2554
2555 if (has_format) {
2556 options = qdict_new();
2557 qdict_put(options, "driver", qstring_from_str(format));
2558 }
2559
2560 assert(!medium_bs);
2561 ret = bdrv_open(&medium_bs, filename, NULL, options, bdrv_flags, errp);
2562 if (ret < 0) {
2563 goto fail;
2564 }
2565
2566 blk_apply_root_state(blk, medium_bs);
2567
2568 bdrv_add_key(medium_bs, NULL, &err);
2569 if (err) {
2570 error_propagate(errp, err);
2571 goto fail;
2572 }
2573
2574 qmp_blockdev_open_tray(device, false, false, &err);
2575 if (err) {
2576 error_propagate(errp, err);
2577 goto fail;
2578 }
2579
2580 qmp_x_blockdev_remove_medium(device, &err);
2581 if (err) {
2582 error_propagate(errp, err);
2583 goto fail;
2584 }
2585
2586 qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
2587 if (err) {
2588 error_propagate(errp, err);
2589 goto fail;
2590 }
2591
2592 qmp_blockdev_close_tray(device, errp);
2593
2594 fail:
2595 /* If the medium has been inserted, the device has its own reference, so
2596 * ours must be relinquished; and if it has not been inserted successfully,
2597 * the reference must be relinquished anyway */
2598 bdrv_unref(medium_bs);
2599 }
2600
2601 /* throttling disk I/O limits */
2602 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2603 int64_t bps_wr,
2604 int64_t iops,
2605 int64_t iops_rd,
2606 int64_t iops_wr,
2607 bool has_bps_max,
2608 int64_t bps_max,
2609 bool has_bps_rd_max,
2610 int64_t bps_rd_max,
2611 bool has_bps_wr_max,
2612 int64_t bps_wr_max,
2613 bool has_iops_max,
2614 int64_t iops_max,
2615 bool has_iops_rd_max,
2616 int64_t iops_rd_max,
2617 bool has_iops_wr_max,
2618 int64_t iops_wr_max,
2619 bool has_bps_max_length,
2620 int64_t bps_max_length,
2621 bool has_bps_rd_max_length,
2622 int64_t bps_rd_max_length,
2623 bool has_bps_wr_max_length,
2624 int64_t bps_wr_max_length,
2625 bool has_iops_max_length,
2626 int64_t iops_max_length,
2627 bool has_iops_rd_max_length,
2628 int64_t iops_rd_max_length,
2629 bool has_iops_wr_max_length,
2630 int64_t iops_wr_max_length,
2631 bool has_iops_size,
2632 int64_t iops_size,
2633 bool has_group,
2634 const char *group, Error **errp)
2635 {
2636 ThrottleConfig cfg;
2637 BlockDriverState *bs;
2638 BlockBackend *blk;
2639 AioContext *aio_context;
2640
2641 blk = blk_by_name(device);
2642 if (!blk) {
2643 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2644 "Device '%s' not found", device);
2645 return;
2646 }
2647
2648 aio_context = blk_get_aio_context(blk);
2649 aio_context_acquire(aio_context);
2650
2651 bs = blk_bs(blk);
2652 if (!bs) {
2653 error_setg(errp, "Device '%s' has no medium", device);
2654 goto out;
2655 }
2656
2657 throttle_config_init(&cfg);
2658 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2659 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2660 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2661
2662 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2663 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2664 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2665
2666 if (has_bps_max) {
2667 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2668 }
2669 if (has_bps_rd_max) {
2670 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2671 }
2672 if (has_bps_wr_max) {
2673 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2674 }
2675 if (has_iops_max) {
2676 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2677 }
2678 if (has_iops_rd_max) {
2679 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2680 }
2681 if (has_iops_wr_max) {
2682 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2683 }
2684
2685 if (has_bps_max_length) {
2686 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = bps_max_length;
2687 }
2688 if (has_bps_rd_max_length) {
2689 cfg.buckets[THROTTLE_BPS_READ].burst_length = bps_rd_max_length;
2690 }
2691 if (has_bps_wr_max_length) {
2692 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = bps_wr_max_length;
2693 }
2694 if (has_iops_max_length) {
2695 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = iops_max_length;
2696 }
2697 if (has_iops_rd_max_length) {
2698 cfg.buckets[THROTTLE_OPS_READ].burst_length = iops_rd_max_length;
2699 }
2700 if (has_iops_wr_max_length) {
2701 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = iops_wr_max_length;
2702 }
2703
2704 if (has_iops_size) {
2705 cfg.op_size = iops_size;
2706 }
2707
2708 if (!throttle_is_valid(&cfg, errp)) {
2709 goto out;
2710 }
2711
2712 if (throttle_enabled(&cfg)) {
2713 /* Enable I/O limits if they're not enabled yet, otherwise
2714 * just update the throttling group. */
2715 if (!bs->throttle_state) {
2716 bdrv_io_limits_enable(bs, has_group ? group : device);
2717 } else if (has_group) {
2718 bdrv_io_limits_update_group(bs, group);
2719 }
2720 /* Set the new throttling configuration */
2721 bdrv_set_io_limits(bs, &cfg);
2722 } else if (bs->throttle_state) {
2723 /* If all throttling settings are set to 0, disable I/O limits */
2724 bdrv_io_limits_disable(bs);
2725 }
2726
2727 out:
2728 aio_context_release(aio_context);
2729 }
2730
2731 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2732 bool has_granularity, uint32_t granularity,
2733 Error **errp)
2734 {
2735 AioContext *aio_context;
2736 BlockDriverState *bs;
2737
2738 if (!name || name[0] == '\0') {
2739 error_setg(errp, "Bitmap name cannot be empty");
2740 return;
2741 }
2742
2743 bs = bdrv_lookup_bs(node, node, errp);
2744 if (!bs) {
2745 return;
2746 }
2747
2748 aio_context = bdrv_get_aio_context(bs);
2749 aio_context_acquire(aio_context);
2750
2751 if (has_granularity) {
2752 if (granularity < 512 || !is_power_of_2(granularity)) {
2753 error_setg(errp, "Granularity must be power of 2 "
2754 "and at least 512");
2755 goto out;
2756 }
2757 } else {
2758 /* Default to cluster size, if available: */
2759 granularity = bdrv_get_default_bitmap_granularity(bs);
2760 }
2761
2762 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2763
2764 out:
2765 aio_context_release(aio_context);
2766 }
2767
2768 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2769 Error **errp)
2770 {
2771 AioContext *aio_context;
2772 BlockDriverState *bs;
2773 BdrvDirtyBitmap *bitmap;
2774
2775 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2776 if (!bitmap || !bs) {
2777 return;
2778 }
2779
2780 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2781 error_setg(errp,
2782 "Bitmap '%s' is currently frozen and cannot be removed",
2783 name);
2784 goto out;
2785 }
2786 bdrv_dirty_bitmap_make_anon(bitmap);
2787 bdrv_release_dirty_bitmap(bs, bitmap);
2788
2789 out:
2790 aio_context_release(aio_context);
2791 }
2792
2793 /**
2794 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2795 * immediately after a full backup operation.
2796 */
2797 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2798 Error **errp)
2799 {
2800 AioContext *aio_context;
2801 BdrvDirtyBitmap *bitmap;
2802 BlockDriverState *bs;
2803
2804 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2805 if (!bitmap || !bs) {
2806 return;
2807 }
2808
2809 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2810 error_setg(errp,
2811 "Bitmap '%s' is currently frozen and cannot be modified",
2812 name);
2813 goto out;
2814 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2815 error_setg(errp,
2816 "Bitmap '%s' is currently disabled and cannot be cleared",
2817 name);
2818 goto out;
2819 }
2820
2821 bdrv_clear_dirty_bitmap(bitmap, NULL);
2822
2823 out:
2824 aio_context_release(aio_context);
2825 }
2826
2827 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2828 {
2829 const char *id = qdict_get_str(qdict, "id");
2830 BlockBackend *blk;
2831 BlockDriverState *bs;
2832 AioContext *aio_context;
2833 Error *local_err = NULL;
2834
2835 bs = bdrv_find_node(id);
2836 if (bs) {
2837 qmp_x_blockdev_del(false, NULL, true, id, &local_err);
2838 if (local_err) {
2839 error_report_err(local_err);
2840 }
2841 return;
2842 }
2843
2844 blk = blk_by_name(id);
2845 if (!blk) {
2846 error_report("Device '%s' not found", id);
2847 return;
2848 }
2849
2850 if (!blk_legacy_dinfo(blk)) {
2851 error_report("Deleting device added with blockdev-add"
2852 " is not supported");
2853 return;
2854 }
2855
2856 aio_context = blk_get_aio_context(blk);
2857 aio_context_acquire(aio_context);
2858
2859 bs = blk_bs(blk);
2860 if (bs) {
2861 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2862 error_report_err(local_err);
2863 aio_context_release(aio_context);
2864 return;
2865 }
2866
2867 blk_remove_bs(blk);
2868 }
2869
2870 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2871 monitor_remove_blk(blk);
2872 if (blk_bs(blk)) {
2873 bdrv_make_anon(blk_bs(blk));
2874 }
2875
2876 /* If this BlockBackend has a device attached to it, its refcount will be
2877 * decremented when the device is removed; otherwise we have to do so here.
2878 */
2879 if (blk_get_attached_dev(blk)) {
2880 /* Further I/O must not pause the guest */
2881 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2882 BLOCKDEV_ON_ERROR_REPORT);
2883 } else {
2884 blk_unref(blk);
2885 }
2886
2887 aio_context_release(aio_context);
2888 }
2889
2890 void qmp_block_resize(bool has_device, const char *device,
2891 bool has_node_name, const char *node_name,
2892 int64_t size, Error **errp)
2893 {
2894 Error *local_err = NULL;
2895 BlockDriverState *bs;
2896 AioContext *aio_context;
2897 int ret;
2898
2899 bs = bdrv_lookup_bs(has_device ? device : NULL,
2900 has_node_name ? node_name : NULL,
2901 &local_err);
2902 if (local_err) {
2903 error_propagate(errp, local_err);
2904 return;
2905 }
2906
2907 aio_context = bdrv_get_aio_context(bs);
2908 aio_context_acquire(aio_context);
2909
2910 if (!bdrv_is_first_non_filter(bs)) {
2911 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2912 goto out;
2913 }
2914
2915 if (size < 0) {
2916 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2917 goto out;
2918 }
2919
2920 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2921 error_setg(errp, QERR_DEVICE_IN_USE, device);
2922 goto out;
2923 }
2924
2925 /* complete all in-flight operations before resizing the device */
2926 bdrv_drain_all();
2927
2928 ret = bdrv_truncate(bs, size);
2929 switch (ret) {
2930 case 0:
2931 break;
2932 case -ENOMEDIUM:
2933 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2934 break;
2935 case -ENOTSUP:
2936 error_setg(errp, QERR_UNSUPPORTED);
2937 break;
2938 case -EACCES:
2939 error_setg(errp, "Device '%s' is read only", device);
2940 break;
2941 case -EBUSY:
2942 error_setg(errp, QERR_DEVICE_IN_USE, device);
2943 break;
2944 default:
2945 error_setg_errno(errp, -ret, "Could not resize");
2946 break;
2947 }
2948
2949 out:
2950 aio_context_release(aio_context);
2951 }
2952
2953 static void block_job_cb(void *opaque, int ret)
2954 {
2955 /* Note that this function may be executed from another AioContext besides
2956 * the QEMU main loop. If you need to access anything that assumes the
2957 * QEMU global mutex, use a BH or introduce a mutex.
2958 */
2959
2960 BlockDriverState *bs = opaque;
2961 const char *msg = NULL;
2962
2963 trace_block_job_cb(bs, bs->job, ret);
2964
2965 assert(bs->job);
2966
2967 if (ret < 0) {
2968 msg = strerror(-ret);
2969 }
2970
2971 if (block_job_is_cancelled(bs->job)) {
2972 block_job_event_cancelled(bs->job);
2973 } else {
2974 block_job_event_completed(bs->job, msg);
2975 }
2976 }
2977
2978 void qmp_block_stream(const char *device,
2979 bool has_base, const char *base,
2980 bool has_backing_file, const char *backing_file,
2981 bool has_speed, int64_t speed,
2982 bool has_on_error, BlockdevOnError on_error,
2983 Error **errp)
2984 {
2985 BlockBackend *blk;
2986 BlockDriverState *bs;
2987 BlockDriverState *base_bs = NULL;
2988 AioContext *aio_context;
2989 Error *local_err = NULL;
2990 const char *base_name = NULL;
2991
2992 if (!has_on_error) {
2993 on_error = BLOCKDEV_ON_ERROR_REPORT;
2994 }
2995
2996 blk = blk_by_name(device);
2997 if (!blk) {
2998 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2999 "Device '%s' not found", device);
3000 return;
3001 }
3002
3003 aio_context = blk_get_aio_context(blk);
3004 aio_context_acquire(aio_context);
3005
3006 if (!blk_is_available(blk)) {
3007 error_setg(errp, "Device '%s' has no medium", device);
3008 goto out;
3009 }
3010 bs = blk_bs(blk);
3011
3012 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
3013 goto out;
3014 }
3015
3016 if (has_base) {
3017 base_bs = bdrv_find_backing_image(bs, base);
3018 if (base_bs == NULL) {
3019 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3020 goto out;
3021 }
3022 assert(bdrv_get_aio_context(base_bs) == aio_context);
3023 base_name = base;
3024 }
3025
3026 /* if we are streaming the entire chain, the result will have no backing
3027 * file, and specifying one is therefore an error */
3028 if (base_bs == NULL && has_backing_file) {
3029 error_setg(errp, "backing file specified, but streaming the "
3030 "entire chain");
3031 goto out;
3032 }
3033
3034 /* backing_file string overrides base bs filename */
3035 base_name = has_backing_file ? backing_file : base_name;
3036
3037 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
3038 on_error, block_job_cb, bs, &local_err);
3039 if (local_err) {
3040 error_propagate(errp, local_err);
3041 goto out;
3042 }
3043
3044 trace_qmp_block_stream(bs, bs->job);
3045
3046 out:
3047 aio_context_release(aio_context);
3048 }
3049
3050 void qmp_block_commit(const char *device,
3051 bool has_base, const char *base,
3052 bool has_top, const char *top,
3053 bool has_backing_file, const char *backing_file,
3054 bool has_speed, int64_t speed,
3055 Error **errp)
3056 {
3057 BlockBackend *blk;
3058 BlockDriverState *bs;
3059 BlockDriverState *base_bs, *top_bs;
3060 AioContext *aio_context;
3061 Error *local_err = NULL;
3062 /* This will be part of the QMP command, if/when the
3063 * BlockdevOnError change for blkmirror makes it in
3064 */
3065 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3066
3067 if (!has_speed) {
3068 speed = 0;
3069 }
3070
3071 /* Important Note:
3072 * libvirt relies on the DeviceNotFound error class in order to probe for
3073 * live commit feature versions; for this to work, we must make sure to
3074 * perform the device lookup before any generic errors that may occur in a
3075 * scenario in which all optional arguments are omitted. */
3076 blk = blk_by_name(device);
3077 if (!blk) {
3078 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3079 "Device '%s' not found", device);
3080 return;
3081 }
3082
3083 aio_context = blk_get_aio_context(blk);
3084 aio_context_acquire(aio_context);
3085
3086 if (!blk_is_available(blk)) {
3087 error_setg(errp, "Device '%s' has no medium", device);
3088 goto out;
3089 }
3090 bs = blk_bs(blk);
3091
3092 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3093 goto out;
3094 }
3095
3096 /* default top_bs is the active layer */
3097 top_bs = bs;
3098
3099 if (has_top && top) {
3100 if (strcmp(bs->filename, top) != 0) {
3101 top_bs = bdrv_find_backing_image(bs, top);
3102 }
3103 }
3104
3105 if (top_bs == NULL) {
3106 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3107 goto out;
3108 }
3109
3110 assert(bdrv_get_aio_context(top_bs) == aio_context);
3111
3112 if (has_base && base) {
3113 base_bs = bdrv_find_backing_image(top_bs, base);
3114 } else {
3115 base_bs = bdrv_find_base(top_bs);
3116 }
3117
3118 if (base_bs == NULL) {
3119 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3120 goto out;
3121 }
3122
3123 assert(bdrv_get_aio_context(base_bs) == aio_context);
3124
3125 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3126 goto out;
3127 }
3128
3129 /* Do not allow attempts to commit an image into itself */
3130 if (top_bs == base_bs) {
3131 error_setg(errp, "cannot commit an image into itself");
3132 goto out;
3133 }
3134
3135 if (top_bs == bs) {
3136 if (has_backing_file) {
3137 error_setg(errp, "'backing-file' specified,"
3138 " but 'top' is the active layer");
3139 goto out;
3140 }
3141 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
3142 bs, &local_err);
3143 } else {
3144 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
3145 has_backing_file ? backing_file : NULL, &local_err);
3146 }
3147 if (local_err != NULL) {
3148 error_propagate(errp, local_err);
3149 goto out;
3150 }
3151
3152 out:
3153 aio_context_release(aio_context);
3154 }
3155
3156 static void do_drive_backup(const char *device, const char *target,
3157 bool has_format, const char *format,
3158 enum MirrorSyncMode sync,
3159 bool has_mode, enum NewImageMode mode,
3160 bool has_speed, int64_t speed,
3161 bool has_bitmap, const char *bitmap,
3162 bool has_on_source_error,
3163 BlockdevOnError on_source_error,
3164 bool has_on_target_error,
3165 BlockdevOnError on_target_error,
3166 BlockJobTxn *txn, Error **errp)
3167 {
3168 BlockBackend *blk;
3169 BlockDriverState *bs;
3170 BlockDriverState *target_bs;
3171 BlockDriverState *source = NULL;
3172 BdrvDirtyBitmap *bmap = NULL;
3173 AioContext *aio_context;
3174 QDict *options = NULL;
3175 Error *local_err = NULL;
3176 int flags;
3177 int64_t size;
3178 int ret;
3179
3180 if (!has_speed) {
3181 speed = 0;
3182 }
3183 if (!has_on_source_error) {
3184 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3185 }
3186 if (!has_on_target_error) {
3187 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3188 }
3189 if (!has_mode) {
3190 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3191 }
3192
3193 blk = blk_by_name(device);
3194 if (!blk) {
3195 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3196 "Device '%s' not found", device);
3197 return;
3198 }
3199
3200 aio_context = blk_get_aio_context(blk);
3201 aio_context_acquire(aio_context);
3202
3203 /* Although backup_run has this check too, we need to use bs->drv below, so
3204 * do an early check redundantly. */
3205 if (!blk_is_available(blk)) {
3206 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3207 goto out;
3208 }
3209 bs = blk_bs(blk);
3210
3211 if (!has_format) {
3212 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3213 }
3214
3215 /* Early check to avoid creating target */
3216 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3217 goto out;
3218 }
3219
3220 flags = bs->open_flags | BDRV_O_RDWR;
3221
3222 /* See if we have a backing HD we can use to create our new image
3223 * on top of. */
3224 if (sync == MIRROR_SYNC_MODE_TOP) {
3225 source = backing_bs(bs);
3226 if (!source) {
3227 sync = MIRROR_SYNC_MODE_FULL;
3228 }
3229 }
3230 if (sync == MIRROR_SYNC_MODE_NONE) {
3231 source = bs;
3232 }
3233
3234 size = bdrv_getlength(bs);
3235 if (size < 0) {
3236 error_setg_errno(errp, -size, "bdrv_getlength failed");
3237 goto out;
3238 }
3239
3240 if (mode != NEW_IMAGE_MODE_EXISTING) {
3241 assert(format);
3242 if (source) {
3243 bdrv_img_create(target, format, source->filename,
3244 source->drv->format_name, NULL,
3245 size, flags, &local_err, false);
3246 } else {
3247 bdrv_img_create(target, format, NULL, NULL, NULL,
3248 size, flags, &local_err, false);
3249 }
3250 }
3251
3252 if (local_err) {
3253 error_propagate(errp, local_err);
3254 goto out;
3255 }
3256
3257 if (format) {
3258 options = qdict_new();
3259 qdict_put(options, "driver", qstring_from_str(format));
3260 }
3261
3262 target_bs = NULL;
3263 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
3264 if (ret < 0) {
3265 error_propagate(errp, local_err);
3266 goto out;
3267 }
3268
3269 bdrv_set_aio_context(target_bs, aio_context);
3270
3271 if (has_bitmap) {
3272 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
3273 if (!bmap) {
3274 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
3275 bdrv_unref(target_bs);
3276 goto out;
3277 }
3278 }
3279
3280 backup_start(bs, target_bs, speed, sync, bmap,
3281 on_source_error, on_target_error,
3282 block_job_cb, bs, txn, &local_err);
3283 if (local_err != NULL) {
3284 bdrv_unref(target_bs);
3285 error_propagate(errp, local_err);
3286 goto out;
3287 }
3288
3289 out:
3290 aio_context_release(aio_context);
3291 }
3292
3293 void qmp_drive_backup(const char *device, const char *target,
3294 bool has_format, const char *format,
3295 enum MirrorSyncMode sync,
3296 bool has_mode, enum NewImageMode mode,
3297 bool has_speed, int64_t speed,
3298 bool has_bitmap, const char *bitmap,
3299 bool has_on_source_error, BlockdevOnError on_source_error,
3300 bool has_on_target_error, BlockdevOnError on_target_error,
3301 Error **errp)
3302 {
3303 return do_drive_backup(device, target, has_format, format, sync,
3304 has_mode, mode, has_speed, speed,
3305 has_bitmap, bitmap,
3306 has_on_source_error, on_source_error,
3307 has_on_target_error, on_target_error,
3308 NULL, errp);
3309 }
3310
3311 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3312 {
3313 return bdrv_named_nodes_list(errp);
3314 }
3315
3316 void do_blockdev_backup(const char *device, const char *target,
3317 enum MirrorSyncMode sync,
3318 bool has_speed, int64_t speed,
3319 bool has_on_source_error,
3320 BlockdevOnError on_source_error,
3321 bool has_on_target_error,
3322 BlockdevOnError on_target_error,
3323 BlockJobTxn *txn, Error **errp)
3324 {
3325 BlockBackend *blk, *target_blk;
3326 BlockDriverState *bs;
3327 BlockDriverState *target_bs;
3328 Error *local_err = NULL;
3329 AioContext *aio_context;
3330
3331 if (!has_speed) {
3332 speed = 0;
3333 }
3334 if (!has_on_source_error) {
3335 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3336 }
3337 if (!has_on_target_error) {
3338 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3339 }
3340
3341 blk = blk_by_name(device);
3342 if (!blk) {
3343 error_setg(errp, "Device '%s' not found", device);
3344 return;
3345 }
3346
3347 aio_context = blk_get_aio_context(blk);
3348 aio_context_acquire(aio_context);
3349
3350 if (!blk_is_available(blk)) {
3351 error_setg(errp, "Device '%s' has no medium", device);
3352 goto out;
3353 }
3354 bs = blk_bs(blk);
3355
3356 target_blk = blk_by_name(target);
3357 if (!target_blk) {
3358 error_setg(errp, "Device '%s' not found", target);
3359 goto out;
3360 }
3361
3362 if (!blk_is_available(target_blk)) {
3363 error_setg(errp, "Device '%s' has no medium", target);
3364 goto out;
3365 }
3366 target_bs = blk_bs(target_blk);
3367
3368 bdrv_ref(target_bs);
3369 bdrv_set_aio_context(target_bs, aio_context);
3370 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
3371 on_target_error, block_job_cb, bs, txn, &local_err);
3372 if (local_err != NULL) {
3373 bdrv_unref(target_bs);
3374 error_propagate(errp, local_err);
3375 }
3376 out:
3377 aio_context_release(aio_context);
3378 }
3379
3380 void qmp_blockdev_backup(const char *device, const char *target,
3381 enum MirrorSyncMode sync,
3382 bool has_speed, int64_t speed,
3383 bool has_on_source_error,
3384 BlockdevOnError on_source_error,
3385 bool has_on_target_error,
3386 BlockdevOnError on_target_error,
3387 Error **errp)
3388 {
3389 do_blockdev_backup(device, target, sync, has_speed, speed,
3390 has_on_source_error, on_source_error,
3391 has_on_target_error, on_target_error,
3392 NULL, errp);
3393 }
3394
3395 /* Parameter check and block job starting for drive mirroring.
3396 * Caller should hold @device and @target's aio context (must be the same).
3397 **/
3398 static void blockdev_mirror_common(BlockDriverState *bs,
3399 BlockDriverState *target,
3400 bool has_replaces, const char *replaces,
3401 enum MirrorSyncMode sync,
3402 bool has_speed, int64_t speed,
3403 bool has_granularity, uint32_t granularity,
3404 bool has_buf_size, int64_t buf_size,
3405 bool has_on_source_error,
3406 BlockdevOnError on_source_error,
3407 bool has_on_target_error,
3408 BlockdevOnError on_target_error,
3409 bool has_unmap, bool unmap,
3410 Error **errp)
3411 {
3412
3413 if (!has_speed) {
3414 speed = 0;
3415 }
3416 if (!has_on_source_error) {
3417 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3418 }
3419 if (!has_on_target_error) {
3420 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3421 }
3422 if (!has_granularity) {
3423 granularity = 0;
3424 }
3425 if (!has_buf_size) {
3426 buf_size = 0;
3427 }
3428 if (!has_unmap) {
3429 unmap = true;
3430 }
3431
3432 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3433 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3434 "a value in range [512B, 64MB]");
3435 return;
3436 }
3437 if (granularity & (granularity - 1)) {
3438 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3439 "power of 2");
3440 return;
3441 }
3442
3443 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3444 return;
3445 }
3446 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3447 return;
3448 }
3449 if (target->blk) {
3450 error_setg(errp, "Cannot mirror to an attached block device");
3451 return;
3452 }
3453
3454 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3455 sync = MIRROR_SYNC_MODE_FULL;
3456 }
3457
3458 /* pass the node name to replace to mirror start since it's loose coupling
3459 * and will allow to check whether the node still exist at mirror completion
3460 */
3461 mirror_start(bs, target,
3462 has_replaces ? replaces : NULL,
3463 speed, granularity, buf_size, sync,
3464 on_source_error, on_target_error, unmap,
3465 block_job_cb, bs, errp);
3466 }
3467
3468 void qmp_drive_mirror(const char *device, const char *target,
3469 bool has_format, const char *format,
3470 bool has_node_name, const char *node_name,
3471 bool has_replaces, const char *replaces,
3472 enum MirrorSyncMode sync,
3473 bool has_mode, enum NewImageMode mode,
3474 bool has_speed, int64_t speed,
3475 bool has_granularity, uint32_t granularity,
3476 bool has_buf_size, int64_t buf_size,
3477 bool has_on_source_error, BlockdevOnError on_source_error,
3478 bool has_on_target_error, BlockdevOnError on_target_error,
3479 bool has_unmap, bool unmap,
3480 Error **errp)
3481 {
3482 BlockDriverState *bs;
3483 BlockBackend *blk;
3484 BlockDriverState *source, *target_bs;
3485 AioContext *aio_context;
3486 Error *local_err = NULL;
3487 QDict *options = NULL;
3488 int flags;
3489 int64_t size;
3490 int ret;
3491
3492 blk = blk_by_name(device);
3493 if (!blk) {
3494 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3495 "Device '%s' not found", device);
3496 return;
3497 }
3498
3499 aio_context = blk_get_aio_context(blk);
3500 aio_context_acquire(aio_context);
3501
3502 if (!blk_is_available(blk)) {
3503 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3504 goto out;
3505 }
3506 bs = blk_bs(blk);
3507 if (!has_mode) {
3508 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3509 }
3510
3511 if (!has_format) {
3512 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3513 }
3514
3515 flags = bs->open_flags | BDRV_O_RDWR;
3516 source = backing_bs(bs);
3517 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3518 sync = MIRROR_SYNC_MODE_FULL;
3519 }
3520 if (sync == MIRROR_SYNC_MODE_NONE) {
3521 source = bs;
3522 }
3523
3524 size = bdrv_getlength(bs);
3525 if (size < 0) {
3526 error_setg_errno(errp, -size, "bdrv_getlength failed");
3527 goto out;
3528 }
3529
3530 if (has_replaces) {
3531 BlockDriverState *to_replace_bs;
3532 AioContext *replace_aio_context;
3533 int64_t replace_size;
3534
3535 if (!has_node_name) {
3536 error_setg(errp, "a node-name must be provided when replacing a"
3537 " named node of the graph");
3538 goto out;
3539 }
3540
3541 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3542
3543 if (!to_replace_bs) {
3544 error_propagate(errp, local_err);
3545 goto out;
3546 }
3547
3548 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3549 aio_context_acquire(replace_aio_context);
3550 replace_size = bdrv_getlength(to_replace_bs);
3551 aio_context_release(replace_aio_context);
3552
3553 if (size != replace_size) {
3554 error_setg(errp, "cannot replace image with a mirror image of "
3555 "different size");
3556 goto out;
3557 }
3558 }
3559
3560 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3561 && mode != NEW_IMAGE_MODE_EXISTING)
3562 {
3563 /* create new image w/o backing file */
3564 assert(format);
3565 bdrv_img_create(target, format,
3566 NULL, NULL, NULL, size, flags, &local_err, false);
3567 } else {
3568 switch (mode) {
3569 case NEW_IMAGE_MODE_EXISTING:
3570 break;
3571 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3572 /* create new image with backing file */
3573 bdrv_img_create(target, format,
3574 source->filename,
3575 source->drv->format_name,
3576 NULL, size, flags, &local_err, false);
3577 break;
3578 default:
3579 abort();
3580 }
3581 }
3582
3583 if (local_err) {
3584 error_propagate(errp, local_err);
3585 goto out;
3586 }
3587
3588 options = qdict_new();
3589 if (has_node_name) {
3590 qdict_put(options, "node-name", qstring_from_str(node_name));
3591 }
3592 if (format) {
3593 qdict_put(options, "driver", qstring_from_str(format));
3594 }
3595
3596 /* Mirroring takes care of copy-on-write using the source's backing
3597 * file.
3598 */
3599 target_bs = NULL;
3600 ret = bdrv_open(&target_bs, target, NULL, options,
3601 flags | BDRV_O_NO_BACKING, &local_err);
3602 if (ret < 0) {
3603 error_propagate(errp, local_err);
3604 goto out;
3605 }
3606
3607 bdrv_set_aio_context(target_bs, aio_context);
3608
3609 blockdev_mirror_common(bs, target_bs,
3610 has_replaces, replaces, sync,
3611 has_speed, speed,
3612 has_granularity, granularity,
3613 has_buf_size, buf_size,
3614 has_on_source_error, on_source_error,
3615 has_on_target_error, on_target_error,
3616 has_unmap, unmap,
3617 &local_err);
3618 if (local_err) {
3619 error_propagate(errp, local_err);
3620 bdrv_unref(target_bs);
3621 }
3622 out:
3623 aio_context_release(aio_context);
3624 }
3625
3626 void qmp_blockdev_mirror(const char *device, const char *target,
3627 bool has_replaces, const char *replaces,
3628 MirrorSyncMode sync,
3629 bool has_speed, int64_t speed,
3630 bool has_granularity, uint32_t granularity,
3631 bool has_buf_size, int64_t buf_size,
3632 bool has_on_source_error,
3633 BlockdevOnError on_source_error,
3634 bool has_on_target_error,
3635 BlockdevOnError on_target_error,
3636 Error **errp)
3637 {
3638 BlockDriverState *bs;
3639 BlockBackend *blk;
3640 BlockDriverState *target_bs;
3641 AioContext *aio_context;
3642 Error *local_err = NULL;
3643
3644 blk = blk_by_name(device);
3645 if (!blk) {
3646 error_setg(errp, "Device '%s' not found", device);
3647 return;
3648 }
3649 bs = blk_bs(blk);
3650
3651 if (!bs) {
3652 error_setg(errp, "Device '%s' has no media", device);
3653 return;
3654 }
3655
3656 target_bs = bdrv_lookup_bs(target, target, errp);
3657 if (!target_bs) {
3658 return;
3659 }
3660
3661 aio_context = bdrv_get_aio_context(bs);
3662 aio_context_acquire(aio_context);
3663
3664 bdrv_ref(target_bs);
3665 bdrv_set_aio_context(target_bs, aio_context);
3666
3667 blockdev_mirror_common(bs, target_bs,
3668 has_replaces, replaces, sync,
3669 has_speed, speed,
3670 has_granularity, granularity,
3671 has_buf_size, buf_size,
3672 has_on_source_error, on_source_error,
3673 has_on_target_error, on_target_error,
3674 true, true,
3675 &local_err);
3676 if (local_err) {
3677 error_propagate(errp, local_err);
3678 bdrv_unref(target_bs);
3679 }
3680
3681 aio_context_release(aio_context);
3682 }
3683
3684 /* Get the block job for a given device name and acquire its AioContext */
3685 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3686 Error **errp)
3687 {
3688 BlockBackend *blk;
3689 BlockDriverState *bs;
3690
3691 *aio_context = NULL;
3692
3693 blk = blk_by_name(device);
3694 if (!blk) {
3695 goto notfound;
3696 }
3697
3698 *aio_context = blk_get_aio_context(blk);
3699 aio_context_acquire(*aio_context);
3700
3701 if (!blk_is_available(blk)) {
3702 goto notfound;
3703 }
3704 bs = blk_bs(blk);
3705
3706 if (!bs->job) {
3707 goto notfound;
3708 }
3709
3710 return bs->job;
3711
3712 notfound:
3713 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3714 "No active block job on device '%s'", device);
3715 if (*aio_context) {
3716 aio_context_release(*aio_context);
3717 *aio_context = NULL;
3718 }
3719 return NULL;
3720 }
3721
3722 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3723 {
3724 AioContext *aio_context;
3725 BlockJob *job = find_block_job(device, &aio_context, errp);
3726
3727 if (!job) {
3728 return;
3729 }
3730
3731 block_job_set_speed(job, speed, errp);
3732 aio_context_release(aio_context);
3733 }
3734
3735 void qmp_block_job_cancel(const char *device,
3736 bool has_force, bool force, Error **errp)
3737 {
3738 AioContext *aio_context;
3739 BlockJob *job = find_block_job(device, &aio_context, errp);
3740
3741 if (!job) {
3742 return;
3743 }
3744
3745 if (!has_force) {
3746 force = false;
3747 }
3748
3749 if (job->user_paused && !force) {
3750 error_setg(errp, "The block job for device '%s' is currently paused",
3751 device);
3752 goto out;
3753 }
3754
3755 trace_qmp_block_job_cancel(job);
3756 block_job_cancel(job);
3757 out:
3758 aio_context_release(aio_context);
3759 }
3760
3761 void qmp_block_job_pause(const char *device, Error **errp)
3762 {
3763 AioContext *aio_context;
3764 BlockJob *job = find_block_job(device, &aio_context, errp);
3765
3766 if (!job || job->user_paused) {
3767 return;
3768 }
3769
3770 job->user_paused = true;
3771 trace_qmp_block_job_pause(job);
3772 block_job_pause(job);
3773 aio_context_release(aio_context);
3774 }
3775
3776 void qmp_block_job_resume(const char *device, Error **errp)
3777 {
3778 AioContext *aio_context;
3779 BlockJob *job = find_block_job(device, &aio_context, errp);
3780
3781 if (!job || !job->user_paused) {
3782 return;
3783 }
3784
3785 job->user_paused = false;
3786 trace_qmp_block_job_resume(job);
3787 block_job_resume(job);
3788 aio_context_release(aio_context);
3789 }
3790
3791 void qmp_block_job_complete(const char *device, Error **errp)
3792 {
3793 AioContext *aio_context;
3794 BlockJob *job = find_block_job(device, &aio_context, errp);
3795
3796 if (!job) {
3797 return;
3798 }
3799
3800 trace_qmp_block_job_complete(job);
3801 block_job_complete(job, errp);
3802 aio_context_release(aio_context);
3803 }
3804
3805 void qmp_change_backing_file(const char *device,
3806 const char *image_node_name,
3807 const char *backing_file,
3808 Error **errp)
3809 {
3810 BlockBackend *blk;
3811 BlockDriverState *bs = NULL;
3812 AioContext *aio_context;
3813 BlockDriverState *image_bs = NULL;
3814 Error *local_err = NULL;
3815 bool ro;
3816 int open_flags;
3817 int ret;
3818
3819 blk = blk_by_name(device);
3820 if (!blk) {
3821 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3822 "Device '%s' not found", device);
3823 return;
3824 }
3825
3826 aio_context = blk_get_aio_context(blk);
3827 aio_context_acquire(aio_context);
3828
3829 if (!blk_is_available(blk)) {
3830 error_setg(errp, "Device '%s' has no medium", device);
3831 goto out;
3832 }
3833 bs = blk_bs(blk);
3834
3835 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3836 if (local_err) {
3837 error_propagate(errp, local_err);
3838 goto out;
3839 }
3840
3841 if (!image_bs) {
3842 error_setg(errp, "image file not found");
3843 goto out;
3844 }
3845
3846 if (bdrv_find_base(image_bs) == image_bs) {
3847 error_setg(errp, "not allowing backing file change on an image "
3848 "without a backing file");
3849 goto out;
3850 }
3851
3852 /* even though we are not necessarily operating on bs, we need it to
3853 * determine if block ops are currently prohibited on the chain */
3854 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3855 goto out;
3856 }
3857
3858 /* final sanity check */
3859 if (!bdrv_chain_contains(bs, image_bs)) {
3860 error_setg(errp, "'%s' and image file are not in the same chain",
3861 device);
3862 goto out;
3863 }
3864
3865 /* if not r/w, reopen to make r/w */
3866 open_flags = image_bs->open_flags;
3867 ro = bdrv_is_read_only(image_bs);
3868
3869 if (ro) {
3870 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3871 if (local_err) {
3872 error_propagate(errp, local_err);
3873 goto out;
3874 }
3875 }
3876
3877 ret = bdrv_change_backing_file(image_bs, backing_file,
3878 image_bs->drv ? image_bs->drv->format_name : "");
3879
3880 if (ret < 0) {
3881 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3882 backing_file);
3883 /* don't exit here, so we can try to restore open flags if
3884 * appropriate */
3885 }
3886
3887 if (ro) {
3888 bdrv_reopen(image_bs, open_flags, &local_err);
3889 if (local_err) {
3890 error_propagate(errp, local_err); /* will preserve prior errp */
3891 }
3892 }
3893
3894 out:
3895 aio_context_release(aio_context);
3896 }
3897
3898 void hmp_drive_add_node(Monitor *mon, const char *optstr)
3899 {
3900 QemuOpts *opts;
3901 QDict *qdict;
3902 Error *local_err = NULL;
3903
3904 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
3905 if (!opts) {
3906 return;
3907 }
3908
3909 qdict = qemu_opts_to_qdict(opts, NULL);
3910
3911 if (!qdict_get_try_str(qdict, "node-name")) {
3912 QDECREF(qdict);
3913 error_report("'node-name' needs to be specified");
3914 goto out;
3915 }
3916
3917 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
3918 if (!bs) {
3919 error_report_err(local_err);
3920 goto out;
3921 }
3922
3923 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3924
3925 out:
3926 qemu_opts_del(opts);
3927 }
3928
3929 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3930 {
3931 QmpOutputVisitor *ov = qmp_output_visitor_new();
3932 BlockDriverState *bs;
3933 BlockBackend *blk = NULL;
3934 QObject *obj;
3935 QDict *qdict;
3936 Error *local_err = NULL;
3937
3938 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3939 * cache.direct=false instead of silently switching to aio=threads, except
3940 * when called from drive_new().
3941 *
3942 * For now, simply forbidding the combination for all drivers will do. */
3943 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3944 bool direct = options->has_cache &&
3945 options->cache->has_direct &&
3946 options->cache->direct;
3947 if (!direct) {
3948 error_setg(errp, "aio=native requires cache.direct=true");
3949 goto fail;
3950 }
3951 }
3952
3953 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), NULL, &options,
3954 &local_err);
3955 if (local_err) {
3956 error_propagate(errp, local_err);
3957 goto fail;
3958 }
3959
3960 obj = qmp_output_get_qobject(ov);
3961 qdict = qobject_to_qdict(obj);
3962
3963 qdict_flatten(qdict);
3964
3965 if (options->has_id) {
3966 blk = blockdev_init(NULL, qdict, &local_err);
3967 if (local_err) {
3968 error_propagate(errp, local_err);
3969 goto fail;
3970 }
3971
3972 bs = blk_bs(blk);
3973 } else {
3974 if (!qdict_get_try_str(qdict, "node-name")) {
3975 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3976 "the root node");
3977 goto fail;
3978 }
3979
3980 bs = bds_tree_init(qdict, errp);
3981 if (!bs) {
3982 goto fail;
3983 }
3984
3985 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3986 }
3987
3988 if (bs && bdrv_key_required(bs)) {
3989 if (blk) {
3990 monitor_remove_blk(blk);
3991 blk_unref(blk);
3992 } else {
3993 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3994 bdrv_unref(bs);
3995 }
3996 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3997 goto fail;
3998 }
3999
4000 fail:
4001 qmp_output_visitor_cleanup(ov);
4002 }
4003
4004 void qmp_x_blockdev_del(bool has_id, const char *id,
4005 bool has_node_name, const char *node_name, Error **errp)
4006 {
4007 AioContext *aio_context;
4008 BlockBackend *blk;
4009 BlockDriverState *bs;
4010
4011 if (has_id && has_node_name) {
4012 error_setg(errp, "Only one of id and node-name must be specified");
4013 return;
4014 } else if (!has_id && !has_node_name) {
4015 error_setg(errp, "No block device specified");
4016 return;
4017 }
4018
4019 if (has_id) {
4020 /* blk_by_name() never returns a BB that is not owned by the monitor */
4021 blk = blk_by_name(id);
4022 if (!blk) {
4023 error_setg(errp, "Cannot find block backend %s", id);
4024 return;
4025 }
4026 if (blk_get_refcnt(blk) > 1) {
4027 error_setg(errp, "Block backend %s is in use", id);
4028 return;
4029 }
4030 bs = blk_bs(blk);
4031 aio_context = blk_get_aio_context(blk);
4032 } else {
4033 bs = bdrv_find_node(node_name);
4034 if (!bs) {
4035 error_setg(errp, "Cannot find node %s", node_name);
4036 return;
4037 }
4038 blk = bs->blk;
4039 if (blk) {
4040 error_setg(errp, "Node %s is in use by %s",
4041 node_name, blk_name(blk));
4042 return;
4043 }
4044 aio_context = bdrv_get_aio_context(bs);
4045 }
4046
4047 aio_context_acquire(aio_context);
4048
4049 if (bs) {
4050 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4051 goto out;
4052 }
4053
4054 if (!blk && !bs->monitor_list.tqe_prev) {
4055 error_setg(errp, "Node %s is not owned by the monitor",
4056 bs->node_name);
4057 goto out;
4058 }
4059
4060 if (bs->refcnt > 1) {
4061 error_setg(errp, "Block device %s is in use",
4062 bdrv_get_device_or_node_name(bs));
4063 goto out;
4064 }
4065 }
4066
4067 if (blk) {
4068 monitor_remove_blk(blk);
4069 blk_unref(blk);
4070 } else {
4071 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4072 bdrv_unref(bs);
4073 }
4074
4075 out:
4076 aio_context_release(aio_context);
4077 }
4078
4079 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4080 {
4081 BlockJobInfoList *head = NULL, **p_next = &head;
4082 BlockDriverState *bs;
4083
4084 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
4085 AioContext *aio_context = bdrv_get_aio_context(bs);
4086
4087 aio_context_acquire(aio_context);
4088
4089 if (bs->job) {
4090 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
4091 elem->value = block_job_query(bs->job);
4092 *p_next = elem;
4093 p_next = &elem->next;
4094 }
4095
4096 aio_context_release(aio_context);
4097 }
4098
4099 return head;
4100 }
4101
4102 QemuOptsList qemu_common_drive_opts = {
4103 .name = "drive",
4104 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4105 .desc = {
4106 {
4107 .name = "snapshot",
4108 .type = QEMU_OPT_BOOL,
4109 .help = "enable/disable snapshot mode",
4110 },{
4111 .name = "discard",
4112 .type = QEMU_OPT_STRING,
4113 .help = "discard operation (ignore/off, unmap/on)",
4114 },{
4115 .name = "aio",
4116 .type = QEMU_OPT_STRING,
4117 .help = "host AIO implementation (threads, native)",
4118 },{
4119 .name = "format",
4120 .type = QEMU_OPT_STRING,
4121 .help = "disk format (raw, qcow2, ...)",
4122 },{
4123 .name = "rerror",
4124 .type = QEMU_OPT_STRING,
4125 .help = "read error action",
4126 },{
4127 .name = "werror",
4128 .type = QEMU_OPT_STRING,
4129 .help = "write error action",
4130 },{
4131 .name = "read-only",
4132 .type = QEMU_OPT_BOOL,
4133 .help = "open drive file as read-only",
4134 },{
4135 .name = "throttling.iops-total",
4136 .type = QEMU_OPT_NUMBER,
4137 .help = "limit total I/O operations per second",
4138 },{
4139 .name = "throttling.iops-read",
4140 .type = QEMU_OPT_NUMBER,
4141 .help = "limit read operations per second",
4142 },{
4143 .name = "throttling.iops-write",
4144 .type = QEMU_OPT_NUMBER,
4145 .help = "limit write operations per second",
4146 },{
4147 .name = "throttling.bps-total",
4148 .type = QEMU_OPT_NUMBER,
4149 .help = "limit total bytes per second",
4150 },{
4151 .name = "throttling.bps-read",
4152 .type = QEMU_OPT_NUMBER,
4153 .help = "limit read bytes per second",
4154 },{
4155 .name = "throttling.bps-write",
4156 .type = QEMU_OPT_NUMBER,
4157 .help = "limit write bytes per second",
4158 },{
4159 .name = "throttling.iops-total-max",
4160 .type = QEMU_OPT_NUMBER,
4161 .help = "I/O operations burst",
4162 },{
4163 .name = "throttling.iops-read-max",
4164 .type = QEMU_OPT_NUMBER,
4165 .help = "I/O operations read burst",
4166 },{
4167 .name = "throttling.iops-write-max",
4168 .type = QEMU_OPT_NUMBER,
4169 .help = "I/O operations write burst",
4170 },{
4171 .name = "throttling.bps-total-max",
4172 .type = QEMU_OPT_NUMBER,
4173 .help = "total bytes burst",
4174 },{
4175 .name = "throttling.bps-read-max",
4176 .type = QEMU_OPT_NUMBER,
4177 .help = "total bytes read burst",
4178 },{
4179 .name = "throttling.bps-write-max",
4180 .type = QEMU_OPT_NUMBER,
4181 .help = "total bytes write burst",
4182 },{
4183 .name = "throttling.iops-total-max-length",
4184 .type = QEMU_OPT_NUMBER,
4185 .help = "length of the iops-total-max burst period, in seconds",
4186 },{
4187 .name = "throttling.iops-read-max-length",
4188 .type = QEMU_OPT_NUMBER,
4189 .help = "length of the iops-read-max burst period, in seconds",
4190 },{
4191 .name = "throttling.iops-write-max-length",
4192 .type = QEMU_OPT_NUMBER,
4193 .help = "length of the iops-write-max burst period, in seconds",
4194 },{
4195 .name = "throttling.bps-total-max-length",
4196 .type = QEMU_OPT_NUMBER,
4197 .help = "length of the bps-total-max burst period, in seconds",
4198 },{
4199 .name = "throttling.bps-read-max-length",
4200 .type = QEMU_OPT_NUMBER,
4201 .help = "length of the bps-read-max burst period, in seconds",
4202 },{
4203 .name = "throttling.bps-write-max-length",
4204 .type = QEMU_OPT_NUMBER,
4205 .help = "length of the bps-write-max burst period, in seconds",
4206 },{
4207 .name = "throttling.iops-size",
4208 .type = QEMU_OPT_NUMBER,
4209 .help = "when limiting by iops max size of an I/O in bytes",
4210 },{
4211 .name = "throttling.group",
4212 .type = QEMU_OPT_STRING,
4213 .help = "name of the block throttling group",
4214 },{
4215 .name = "copy-on-read",
4216 .type = QEMU_OPT_BOOL,
4217 .help = "copy read data from backing file into image file",
4218 },{
4219 .name = "detect-zeroes",
4220 .type = QEMU_OPT_STRING,
4221 .help = "try to optimize zero writes (off, on, unmap)",
4222 },{
4223 .name = "stats-account-invalid",
4224 .type = QEMU_OPT_BOOL,
4225 .help = "whether to account for invalid I/O operations "
4226 "in the statistics",
4227 },{
4228 .name = "stats-account-failed",
4229 .type = QEMU_OPT_BOOL,
4230 .help = "whether to account for failed I/O operations "
4231 "in the statistics",
4232 },
4233 { /* end of list */ }
4234 },
4235 };
4236
4237 static QemuOptsList qemu_root_bds_opts = {
4238 .name = "root-bds",
4239 .head = QTAILQ_HEAD_INITIALIZER(qemu_root_bds_opts.head),
4240 .desc = {
4241 {
4242 .name = "discard",
4243 .type = QEMU_OPT_STRING,
4244 .help = "discard operation (ignore/off, unmap/on)",
4245 },{
4246 .name = "aio",
4247 .type = QEMU_OPT_STRING,
4248 .help = "host AIO implementation (threads, native)",
4249 },{
4250 .name = "read-only",
4251 .type = QEMU_OPT_BOOL,
4252 .help = "open drive file as read-only",
4253 },{
4254 .name = "copy-on-read",
4255 .type = QEMU_OPT_BOOL,
4256 .help = "copy read data from backing file into image file",
4257 },{
4258 .name = "detect-zeroes",
4259 .type = QEMU_OPT_STRING,
4260 .help = "try to optimize zero writes (off, on, unmap)",
4261 },
4262 { /* end of list */ }
4263 },
4264 };
4265
4266 QemuOptsList qemu_drive_opts = {
4267 .name = "drive",
4268 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4269 .desc = {
4270 /*
4271 * no elements => accept any params
4272 * validation will happen later
4273 */
4274 { /* end of list */ }
4275 },
4276 };
AR7 emulation for QEMU