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qemu-iotests: Test the reopening of overlay_bs in 'block-commit'
[qemu.git] / blockdev.c
blob7645d491cb9a95f69ac943046ef87637950c2a63
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "sysemu/block-backend.h"
34 #include "sysemu/blockdev.h"
35 #include "hw/block/block.h"
36 #include "block/blockjob.h"
37 #include "block/throttle-groups.h"
38 #include "monitor/monitor.h"
39 #include "qemu/error-report.h"
40 #include "qemu/option.h"
41 #include "qemu/config-file.h"
42 #include "qapi/qmp/types.h"
43 #include "qapi-visit.h"
44 #include "qapi/qmp/qerror.h"
45 #include "qapi/qmp-output-visitor.h"
46 #include "qapi/util.h"
47 #include "sysemu/sysemu.h"
48 #include "block/block_int.h"
49 #include "qmp-commands.h"
50 #include "trace.h"
51 #include "sysemu/arch_init.h"
52
53 static const char *const if_name[IF_COUNT] = {
54 [IF_NONE] = "none",
55 [IF_IDE] = "ide",
56 [IF_SCSI] = "scsi",
57 [IF_FLOPPY] = "floppy",
58 [IF_PFLASH] = "pflash",
59 [IF_MTD] = "mtd",
60 [IF_SD] = "sd",
61 [IF_VIRTIO] = "virtio",
62 [IF_XEN] = "xen",
63 };
64
65 static int if_max_devs[IF_COUNT] = {
66 /*
67 * Do not change these numbers! They govern how drive option
68 * index maps to unit and bus. That mapping is ABI.
69 *
70 * All controllers used to imlement if=T drives need to support
71 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
72 * Otherwise, some index values map to "impossible" bus, unit
73 * values.
74 *
75 * For instance, if you change [IF_SCSI] to 255, -drive
76 * if=scsi,index=12 no longer means bus=1,unit=5, but
77 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
78 * the drive can't be set up. Regression.
79 */
80 [IF_IDE] = 2,
81 [IF_SCSI] = 7,
82 };
83
84 /**
85 * Boards may call this to offer board-by-board overrides
86 * of the default, global values.
87 */
88 void override_max_devs(BlockInterfaceType type, int max_devs)
89 {
90 BlockBackend *blk;
91 DriveInfo *dinfo;
92
93 if (max_devs <= 0) {
94 return;
95 }
96
97 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
98 dinfo = blk_legacy_dinfo(blk);
99 if (dinfo->type == type) {
100 fprintf(stderr, "Cannot override units-per-bus property of"
101 " the %s interface, because a drive of that type has"
102 " already been added.\n", if_name[type]);
103 g_assert_not_reached();
104 }
105 }
106
107 if_max_devs[type] = max_devs;
108 }
109
110 /*
111 * We automatically delete the drive when a device using it gets
112 * unplugged. Questionable feature, but we can't just drop it.
113 * Device models call blockdev_mark_auto_del() to schedule the
114 * automatic deletion, and generic qdev code calls blockdev_auto_del()
115 * when deletion is actually safe.
116 */
117 void blockdev_mark_auto_del(BlockBackend *blk)
118 {
119 DriveInfo *dinfo = blk_legacy_dinfo(blk);
120 BlockDriverState *bs = blk_bs(blk);
121 AioContext *aio_context;
122
123 if (!dinfo) {
124 return;
125 }
126
127 if (bs) {
128 aio_context = bdrv_get_aio_context(bs);
129 aio_context_acquire(aio_context);
130
131 if (bs->job) {
132 block_job_cancel(bs->job);
133 }
134
135 aio_context_release(aio_context);
136 }
137
138 dinfo->auto_del = 1;
139 }
140
141 void blockdev_auto_del(BlockBackend *blk)
142 {
143 DriveInfo *dinfo = blk_legacy_dinfo(blk);
144
145 if (dinfo && dinfo->auto_del) {
146 blk_unref(blk);
147 }
148 }
149
150 /**
151 * Returns the current mapping of how many units per bus
152 * a particular interface can support.
153 *
154 * A positive integer indicates n units per bus.
155 * 0 implies the mapping has not been established.
156 * -1 indicates an invalid BlockInterfaceType was given.
157 */
158 int drive_get_max_devs(BlockInterfaceType type)
159 {
160 if (type >= IF_IDE && type < IF_COUNT) {
161 return if_max_devs[type];
162 }
163
164 return -1;
165 }
166
167 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
168 {
169 int max_devs = if_max_devs[type];
170 return max_devs ? index / max_devs : 0;
171 }
172
173 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
174 {
175 int max_devs = if_max_devs[type];
176 return max_devs ? index % max_devs : index;
177 }
178
179 QemuOpts *drive_def(const char *optstr)
180 {
181 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
182 }
183
184 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
185 const char *optstr)
186 {
187 QemuOpts *opts;
188
189 opts = drive_def(optstr);
190 if (!opts) {
191 return NULL;
192 }
193 if (type != IF_DEFAULT) {
194 qemu_opt_set(opts, "if", if_name[type], &error_abort);
195 }
196 if (index >= 0) {
197 qemu_opt_set_number(opts, "index", index, &error_abort);
198 }
199 if (file)
200 qemu_opt_set(opts, "file", file, &error_abort);
201 return opts;
202 }
203
204 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
205 {
206 BlockBackend *blk;
207 DriveInfo *dinfo;
208
209 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
210 dinfo = blk_legacy_dinfo(blk);
211 if (dinfo && dinfo->type == type
212 && dinfo->bus == bus && dinfo->unit == unit) {
213 return dinfo;
214 }
215 }
216
217 return NULL;
218 }
219
220 bool drive_check_orphaned(void)
221 {
222 BlockBackend *blk;
223 DriveInfo *dinfo;
224 bool rs = false;
225
226 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
227 dinfo = blk_legacy_dinfo(blk);
228 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
229 /* Unless this is a default drive, this may be an oversight. */
230 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
231 dinfo->type != IF_NONE) {
232 fprintf(stderr, "Warning: Orphaned drive without device: "
233 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
234 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
235 if_name[dinfo->type], dinfo->bus, dinfo->unit);
236 rs = true;
237 }
238 }
239
240 return rs;
241 }
242
243 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
244 {
245 return drive_get(type,
246 drive_index_to_bus_id(type, index),
247 drive_index_to_unit_id(type, index));
248 }
249
250 int drive_get_max_bus(BlockInterfaceType type)
251 {
252 int max_bus;
253 BlockBackend *blk;
254 DriveInfo *dinfo;
255
256 max_bus = -1;
257 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
258 dinfo = blk_legacy_dinfo(blk);
259 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
260 max_bus = dinfo->bus;
261 }
262 }
263 return max_bus;
264 }
265
266 /* Get a block device. This should only be used for single-drive devices
267 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
268 appropriate bus. */
269 DriveInfo *drive_get_next(BlockInterfaceType type)
270 {
271 static int next_block_unit[IF_COUNT];
272
273 return drive_get(type, 0, next_block_unit[type]++);
274 }
275
276 static void bdrv_format_print(void *opaque, const char *name)
277 {
278 error_printf(" %s", name);
279 }
280
281 typedef struct {
282 QEMUBH *bh;
283 BlockDriverState *bs;
284 } BDRVPutRefBH;
285
286 static void bdrv_put_ref_bh(void *opaque)
287 {
288 BDRVPutRefBH *s = opaque;
289
290 bdrv_unref(s->bs);
291 qemu_bh_delete(s->bh);
292 g_free(s);
293 }
294
295 /*
296 * Release a BDS reference in a BH
297 *
298 * It is not safe to use bdrv_unref() from a callback function when the callers
299 * still need the BlockDriverState. In such cases we schedule a BH to release
300 * the reference.
301 */
302 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
303 {
304 BDRVPutRefBH *s;
305
306 s = g_new(BDRVPutRefBH, 1);
307 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
308 s->bs = bs;
309 qemu_bh_schedule(s->bh);
310 }
311
312 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
313 {
314 if (!strcmp(buf, "ignore")) {
315 return BLOCKDEV_ON_ERROR_IGNORE;
316 } else if (!is_read && !strcmp(buf, "enospc")) {
317 return BLOCKDEV_ON_ERROR_ENOSPC;
318 } else if (!strcmp(buf, "stop")) {
319 return BLOCKDEV_ON_ERROR_STOP;
320 } else if (!strcmp(buf, "report")) {
321 return BLOCKDEV_ON_ERROR_REPORT;
322 } else {
323 error_setg(errp, "'%s' invalid %s error action",
324 buf, is_read ? "read" : "write");
325 return -1;
326 }
327 }
328
329 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
330 {
331 if (throttle_conflicting(cfg)) {
332 error_setg(errp, "bps/iops/max total values and read/write values"
333 " cannot be used at the same time");
334 return false;
335 }
336
337 if (!throttle_is_valid(cfg)) {
338 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
339 return false;
340 }
341
342 if (throttle_max_is_missing_limit(cfg)) {
343 error_setg(errp, "bps_max/iops_max require corresponding"
344 " bps/iops values");
345 return false;
346 }
347
348 return true;
349 }
350
351 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
352
353 /* All parameters but @opts are optional and may be set to NULL. */
354 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
355 const char **throttling_group, ThrottleConfig *throttle_cfg,
356 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
357 {
358 const char *discard;
359 Error *local_error = NULL;
360 const char *aio;
361
362 if (bdrv_flags) {
363 if (!qemu_opt_get_bool(opts, "read-only", false)) {
364 *bdrv_flags |= BDRV_O_RDWR;
365 }
366 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
367 *bdrv_flags |= BDRV_O_COPY_ON_READ;
368 }
369
370 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
371 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
372 error_setg(errp, "Invalid discard option");
373 return;
374 }
375 }
376
377 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
378 *bdrv_flags |= BDRV_O_CACHE_WB;
379 }
380 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
381 *bdrv_flags |= BDRV_O_NOCACHE;
382 }
383 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) {
384 *bdrv_flags |= BDRV_O_NO_FLUSH;
385 }
386
387 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
388 if (!strcmp(aio, "native")) {
389 *bdrv_flags |= BDRV_O_NATIVE_AIO;
390 } else if (!strcmp(aio, "threads")) {
391 /* this is the default */
392 } else {
393 error_setg(errp, "invalid aio option");
394 return;
395 }
396 }
397 }
398
399 /* disk I/O throttling */
400 if (throttling_group) {
401 *throttling_group = qemu_opt_get(opts, "throttling.group");
402 }
403
404 if (throttle_cfg) {
405 memset(throttle_cfg, 0, sizeof(*throttle_cfg));
406 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
407 qemu_opt_get_number(opts, "throttling.bps-total", 0);
408 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
409 qemu_opt_get_number(opts, "throttling.bps-read", 0);
410 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
411 qemu_opt_get_number(opts, "throttling.bps-write", 0);
412 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
413 qemu_opt_get_number(opts, "throttling.iops-total", 0);
414 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
415 qemu_opt_get_number(opts, "throttling.iops-read", 0);
416 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
417 qemu_opt_get_number(opts, "throttling.iops-write", 0);
418
419 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
420 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
421 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
422 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
423 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
424 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
425 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
426 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
427 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
428 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
429 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
430 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
431
432 throttle_cfg->op_size =
433 qemu_opt_get_number(opts, "throttling.iops-size", 0);
434
435 if (!check_throttle_config(throttle_cfg, errp)) {
436 return;
437 }
438 }
439
440 if (detect_zeroes) {
441 *detect_zeroes =
442 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
443 qemu_opt_get(opts, "detect-zeroes"),
444 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
445 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
446 &local_error);
447 if (local_error) {
448 error_propagate(errp, local_error);
449 return;
450 }
451
452 if (bdrv_flags &&
453 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
454 !(*bdrv_flags & BDRV_O_UNMAP))
455 {
456 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
457 "without setting discard operation to unmap");
458 return;
459 }
460 }
461 }
462
463 /* Takes the ownership of bs_opts */
464 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
465 Error **errp)
466 {
467 const char *buf;
468 int bdrv_flags = 0;
469 int on_read_error, on_write_error;
470 BlockBackend *blk;
471 BlockDriverState *bs;
472 ThrottleConfig cfg;
473 int snapshot = 0;
474 Error *error = NULL;
475 QemuOpts *opts;
476 const char *id;
477 bool has_driver_specific_opts;
478 BlockdevDetectZeroesOptions detect_zeroes =
479 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
480 const char *throttling_group = NULL;
481
482 /* Check common options by copying from bs_opts to opts, all other options
483 * stay in bs_opts for processing by bdrv_open(). */
484 id = qdict_get_try_str(bs_opts, "id");
485 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
486 if (error) {
487 error_propagate(errp, error);
488 goto err_no_opts;
489 }
490
491 qemu_opts_absorb_qdict(opts, bs_opts, &error);
492 if (error) {
493 error_propagate(errp, error);
494 goto early_err;
495 }
496
497 if (id) {
498 qdict_del(bs_opts, "id");
499 }
500
501 has_driver_specific_opts = !!qdict_size(bs_opts);
502
503 /* extract parameters */
504 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
505
506 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
507 &detect_zeroes, &error);
508 if (error) {
509 error_propagate(errp, error);
510 goto early_err;
511 }
512
513 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
514 if (is_help_option(buf)) {
515 error_printf("Supported formats:");
516 bdrv_iterate_format(bdrv_format_print, NULL);
517 error_printf("\n");
518 goto early_err;
519 }
520
521 if (qdict_haskey(bs_opts, "driver")) {
522 error_setg(errp, "Cannot specify both 'driver' and 'format'");
523 goto early_err;
524 }
525 qdict_put(bs_opts, "driver", qstring_from_str(buf));
526 }
527
528 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
529 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
530 on_write_error = parse_block_error_action(buf, 0, &error);
531 if (error) {
532 error_propagate(errp, error);
533 goto early_err;
534 }
535 }
536
537 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
538 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
539 on_read_error = parse_block_error_action(buf, 1, &error);
540 if (error) {
541 error_propagate(errp, error);
542 goto early_err;
543 }
544 }
545
546 if (snapshot) {
547 /* always use cache=unsafe with snapshot */
548 bdrv_flags &= ~BDRV_O_CACHE_MASK;
549 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
550 }
551
552 /* init */
553 if ((!file || !*file) && !has_driver_specific_opts) {
554 BlockBackendRootState *blk_rs;
555
556 blk = blk_new(qemu_opts_id(opts), errp);
557 if (!blk) {
558 goto early_err;
559 }
560
561 blk_rs = blk_get_root_state(blk);
562 blk_rs->open_flags = bdrv_flags;
563 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
564 blk_rs->detect_zeroes = detect_zeroes;
565
566 if (throttle_enabled(&cfg)) {
567 if (!throttling_group) {
568 throttling_group = blk_name(blk);
569 }
570 blk_rs->throttle_group = g_strdup(throttling_group);
571 blk_rs->throttle_state = throttle_group_incref(throttling_group);
572 blk_rs->throttle_state->cfg = cfg;
573 }
574
575 QDECREF(bs_opts);
576 } else {
577 if (file && !*file) {
578 file = NULL;
579 }
580
581 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
582 errp);
583 if (!blk) {
584 goto err_no_bs_opts;
585 }
586 bs = blk_bs(blk);
587
588 bs->detect_zeroes = detect_zeroes;
589
590 /* disk I/O throttling */
591 if (throttle_enabled(&cfg)) {
592 if (!throttling_group) {
593 throttling_group = blk_name(blk);
594 }
595 bdrv_io_limits_enable(bs, throttling_group);
596 bdrv_set_io_limits(bs, &cfg);
597 }
598
599 if (bdrv_key_required(bs)) {
600 autostart = 0;
601 }
602 }
603
604 blk_set_on_error(blk, on_read_error, on_write_error);
605
606 err_no_bs_opts:
607 qemu_opts_del(opts);
608 return blk;
609
610 early_err:
611 qemu_opts_del(opts);
612 err_no_opts:
613 QDECREF(bs_opts);
614 return NULL;
615 }
616
617 static QemuOptsList qemu_root_bds_opts;
618
619 /* Takes the ownership of bs_opts */
620 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
621 {
622 BlockDriverState *bs;
623 QemuOpts *opts;
624 Error *local_error = NULL;
625 BlockdevDetectZeroesOptions detect_zeroes;
626 int ret;
627 int bdrv_flags = 0;
628
629 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
630 if (!opts) {
631 goto fail;
632 }
633
634 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
635 if (local_error) {
636 error_propagate(errp, local_error);
637 goto fail;
638 }
639
640 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
641 &detect_zeroes, &local_error);
642 if (local_error) {
643 error_propagate(errp, local_error);
644 goto fail;
645 }
646
647 bs = NULL;
648 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
649 if (ret < 0) {
650 goto fail_no_bs_opts;
651 }
652
653 bs->detect_zeroes = detect_zeroes;
654
655 fail_no_bs_opts:
656 qemu_opts_del(opts);
657 return bs;
658
659 fail:
660 qemu_opts_del(opts);
661 QDECREF(bs_opts);
662 return NULL;
663 }
664
665 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
666 Error **errp)
667 {
668 const char *value;
669
670 value = qemu_opt_get(opts, from);
671 if (value) {
672 if (qemu_opt_find(opts, to)) {
673 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
674 "same time", to, from);
675 return;
676 }
677 }
678
679 /* rename all items in opts */
680 while ((value = qemu_opt_get(opts, from))) {
681 qemu_opt_set(opts, to, value, &error_abort);
682 qemu_opt_unset(opts, from);
683 }
684 }
685
686 QemuOptsList qemu_legacy_drive_opts = {
687 .name = "drive",
688 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
689 .desc = {
690 {
691 .name = "bus",
692 .type = QEMU_OPT_NUMBER,
693 .help = "bus number",
694 },{
695 .name = "unit",
696 .type = QEMU_OPT_NUMBER,
697 .help = "unit number (i.e. lun for scsi)",
698 },{
699 .name = "index",
700 .type = QEMU_OPT_NUMBER,
701 .help = "index number",
702 },{
703 .name = "media",
704 .type = QEMU_OPT_STRING,
705 .help = "media type (disk, cdrom)",
706 },{
707 .name = "if",
708 .type = QEMU_OPT_STRING,
709 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
710 },{
711 .name = "cyls",
712 .type = QEMU_OPT_NUMBER,
713 .help = "number of cylinders (ide disk geometry)",
714 },{
715 .name = "heads",
716 .type = QEMU_OPT_NUMBER,
717 .help = "number of heads (ide disk geometry)",
718 },{
719 .name = "secs",
720 .type = QEMU_OPT_NUMBER,
721 .help = "number of sectors (ide disk geometry)",
722 },{
723 .name = "trans",
724 .type = QEMU_OPT_STRING,
725 .help = "chs translation (auto, lba, none)",
726 },{
727 .name = "boot",
728 .type = QEMU_OPT_BOOL,
729 .help = "(deprecated, ignored)",
730 },{
731 .name = "addr",
732 .type = QEMU_OPT_STRING,
733 .help = "pci address (virtio only)",
734 },{
735 .name = "serial",
736 .type = QEMU_OPT_STRING,
737 .help = "disk serial number",
738 },{
739 .name = "file",
740 .type = QEMU_OPT_STRING,
741 .help = "file name",
742 },
743
744 /* Options that are passed on, but have special semantics with -drive */
745 {
746 .name = "read-only",
747 .type = QEMU_OPT_BOOL,
748 .help = "open drive file as read-only",
749 },{
750 .name = "rerror",
751 .type = QEMU_OPT_STRING,
752 .help = "read error action",
753 },{
754 .name = "werror",
755 .type = QEMU_OPT_STRING,
756 .help = "write error action",
757 },{
758 .name = "copy-on-read",
759 .type = QEMU_OPT_BOOL,
760 .help = "copy read data from backing file into image file",
761 },
762
763 { /* end of list */ }
764 },
765 };
766
767 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
768 {
769 const char *value;
770 BlockBackend *blk;
771 DriveInfo *dinfo = NULL;
772 QDict *bs_opts;
773 QemuOpts *legacy_opts;
774 DriveMediaType media = MEDIA_DISK;
775 BlockInterfaceType type;
776 int cyls, heads, secs, translation;
777 int max_devs, bus_id, unit_id, index;
778 const char *devaddr;
779 const char *werror, *rerror;
780 bool read_only = false;
781 bool copy_on_read;
782 const char *serial;
783 const char *filename;
784 Error *local_err = NULL;
785 int i;
786
787 /* Change legacy command line options into QMP ones */
788 static const struct {
789 const char *from;
790 const char *to;
791 } opt_renames[] = {
792 { "iops", "throttling.iops-total" },
793 { "iops_rd", "throttling.iops-read" },
794 { "iops_wr", "throttling.iops-write" },
795
796 { "bps", "throttling.bps-total" },
797 { "bps_rd", "throttling.bps-read" },
798 { "bps_wr", "throttling.bps-write" },
799
800 { "iops_max", "throttling.iops-total-max" },
801 { "iops_rd_max", "throttling.iops-read-max" },
802 { "iops_wr_max", "throttling.iops-write-max" },
803
804 { "bps_max", "throttling.bps-total-max" },
805 { "bps_rd_max", "throttling.bps-read-max" },
806 { "bps_wr_max", "throttling.bps-write-max" },
807
808 { "iops_size", "throttling.iops-size" },
809
810 { "group", "throttling.group" },
811
812 { "readonly", "read-only" },
813 };
814
815 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
816 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
817 &local_err);
818 if (local_err) {
819 error_report_err(local_err);
820 return NULL;
821 }
822 }
823
824 value = qemu_opt_get(all_opts, "cache");
825 if (value) {
826 int flags = 0;
827
828 if (bdrv_parse_cache_flags(value, &flags) != 0) {
829 error_report("invalid cache option");
830 return NULL;
831 }
832
833 /* Specific options take precedence */
834 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
835 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
836 !!(flags & BDRV_O_CACHE_WB), &error_abort);
837 }
838 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
839 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
840 !!(flags & BDRV_O_NOCACHE), &error_abort);
841 }
842 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
843 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
844 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
845 }
846 qemu_opt_unset(all_opts, "cache");
847 }
848
849 /* Get a QDict for processing the options */
850 bs_opts = qdict_new();
851 qemu_opts_to_qdict(all_opts, bs_opts);
852
853 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
854 &error_abort);
855 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
856 if (local_err) {
857 error_report_err(local_err);
858 goto fail;
859 }
860
861 /* Deprecated option boot=[on|off] */
862 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
863 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
864 "ignored. Future versions will reject this parameter. Please "
865 "update your scripts.\n");
866 }
867
868 /* Media type */
869 value = qemu_opt_get(legacy_opts, "media");
870 if (value) {
871 if (!strcmp(value, "disk")) {
872 media = MEDIA_DISK;
873 } else if (!strcmp(value, "cdrom")) {
874 media = MEDIA_CDROM;
875 read_only = true;
876 } else {
877 error_report("'%s' invalid media", value);
878 goto fail;
879 }
880 }
881
882 /* copy-on-read is disabled with a warning for read-only devices */
883 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
884 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
885
886 if (read_only && copy_on_read) {
887 error_report("warning: disabling copy-on-read on read-only drive");
888 copy_on_read = false;
889 }
890
891 qdict_put(bs_opts, "read-only",
892 qstring_from_str(read_only ? "on" : "off"));
893 qdict_put(bs_opts, "copy-on-read",
894 qstring_from_str(copy_on_read ? "on" :"off"));
895
896 /* Controller type */
897 value = qemu_opt_get(legacy_opts, "if");
898 if (value) {
899 for (type = 0;
900 type < IF_COUNT && strcmp(value, if_name[type]);
901 type++) {
902 }
903 if (type == IF_COUNT) {
904 error_report("unsupported bus type '%s'", value);
905 goto fail;
906 }
907 } else {
908 type = block_default_type;
909 }
910
911 /* Geometry */
912 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
913 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
914 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
915
916 if (cyls || heads || secs) {
917 if (cyls < 1) {
918 error_report("invalid physical cyls number");
919 goto fail;
920 }
921 if (heads < 1) {
922 error_report("invalid physical heads number");
923 goto fail;
924 }
925 if (secs < 1) {
926 error_report("invalid physical secs number");
927 goto fail;
928 }
929 }
930
931 translation = BIOS_ATA_TRANSLATION_AUTO;
932 value = qemu_opt_get(legacy_opts, "trans");
933 if (value != NULL) {
934 if (!cyls) {
935 error_report("'%s' trans must be used with cyls, heads and secs",
936 value);
937 goto fail;
938 }
939 if (!strcmp(value, "none")) {
940 translation = BIOS_ATA_TRANSLATION_NONE;
941 } else if (!strcmp(value, "lba")) {
942 translation = BIOS_ATA_TRANSLATION_LBA;
943 } else if (!strcmp(value, "large")) {
944 translation = BIOS_ATA_TRANSLATION_LARGE;
945 } else if (!strcmp(value, "rechs")) {
946 translation = BIOS_ATA_TRANSLATION_RECHS;
947 } else if (!strcmp(value, "auto")) {
948 translation = BIOS_ATA_TRANSLATION_AUTO;
949 } else {
950 error_report("'%s' invalid translation type", value);
951 goto fail;
952 }
953 }
954
955 if (media == MEDIA_CDROM) {
956 if (cyls || secs || heads) {
957 error_report("CHS can't be set with media=cdrom");
958 goto fail;
959 }
960 }
961
962 /* Device address specified by bus/unit or index.
963 * If none was specified, try to find the first free one. */
964 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
965 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
966 index = qemu_opt_get_number(legacy_opts, "index", -1);
967
968 max_devs = if_max_devs[type];
969
970 if (index != -1) {
971 if (bus_id != 0 || unit_id != -1) {
972 error_report("index cannot be used with bus and unit");
973 goto fail;
974 }
975 bus_id = drive_index_to_bus_id(type, index);
976 unit_id = drive_index_to_unit_id(type, index);
977 }
978
979 if (unit_id == -1) {
980 unit_id = 0;
981 while (drive_get(type, bus_id, unit_id) != NULL) {
982 unit_id++;
983 if (max_devs && unit_id >= max_devs) {
984 unit_id -= max_devs;
985 bus_id++;
986 }
987 }
988 }
989
990 if (max_devs && unit_id >= max_devs) {
991 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
992 goto fail;
993 }
994
995 if (drive_get(type, bus_id, unit_id) != NULL) {
996 error_report("drive with bus=%d, unit=%d (index=%d) exists",
997 bus_id, unit_id, index);
998 goto fail;
999 }
1000
1001 /* Serial number */
1002 serial = qemu_opt_get(legacy_opts, "serial");
1003
1004 /* no id supplied -> create one */
1005 if (qemu_opts_id(all_opts) == NULL) {
1006 char *new_id;
1007 const char *mediastr = "";
1008 if (type == IF_IDE || type == IF_SCSI) {
1009 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1010 }
1011 if (max_devs) {
1012 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1013 mediastr, unit_id);
1014 } else {
1015 new_id = g_strdup_printf("%s%s%i", if_name[type],
1016 mediastr, unit_id);
1017 }
1018 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1019 g_free(new_id);
1020 }
1021
1022 /* Add virtio block device */
1023 devaddr = qemu_opt_get(legacy_opts, "addr");
1024 if (devaddr && type != IF_VIRTIO) {
1025 error_report("addr is not supported by this bus type");
1026 goto fail;
1027 }
1028
1029 if (type == IF_VIRTIO) {
1030 QemuOpts *devopts;
1031 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1032 &error_abort);
1033 if (arch_type == QEMU_ARCH_S390X) {
1034 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1035 } else {
1036 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1037 }
1038 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1039 &error_abort);
1040 if (devaddr) {
1041 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1042 }
1043 }
1044
1045 filename = qemu_opt_get(legacy_opts, "file");
1046
1047 /* Check werror/rerror compatibility with if=... */
1048 werror = qemu_opt_get(legacy_opts, "werror");
1049 if (werror != NULL) {
1050 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1051 type != IF_NONE) {
1052 error_report("werror is not supported by this bus type");
1053 goto fail;
1054 }
1055 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1056 }
1057
1058 rerror = qemu_opt_get(legacy_opts, "rerror");
1059 if (rerror != NULL) {
1060 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1061 type != IF_NONE) {
1062 error_report("rerror is not supported by this bus type");
1063 goto fail;
1064 }
1065 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1066 }
1067
1068 /* Actual block device init: Functionality shared with blockdev-add */
1069 blk = blockdev_init(filename, bs_opts, &local_err);
1070 bs_opts = NULL;
1071 if (!blk) {
1072 if (local_err) {
1073 error_report_err(local_err);
1074 }
1075 goto fail;
1076 } else {
1077 assert(!local_err);
1078 }
1079
1080 /* Create legacy DriveInfo */
1081 dinfo = g_malloc0(sizeof(*dinfo));
1082 dinfo->opts = all_opts;
1083
1084 dinfo->cyls = cyls;
1085 dinfo->heads = heads;
1086 dinfo->secs = secs;
1087 dinfo->trans = translation;
1088
1089 dinfo->type = type;
1090 dinfo->bus = bus_id;
1091 dinfo->unit = unit_id;
1092 dinfo->devaddr = devaddr;
1093 dinfo->serial = g_strdup(serial);
1094
1095 blk_set_legacy_dinfo(blk, dinfo);
1096
1097 switch(type) {
1098 case IF_IDE:
1099 case IF_SCSI:
1100 case IF_XEN:
1101 case IF_NONE:
1102 dinfo->media_cd = media == MEDIA_CDROM;
1103 break;
1104 default:
1105 break;
1106 }
1107
1108 fail:
1109 qemu_opts_del(legacy_opts);
1110 QDECREF(bs_opts);
1111 return dinfo;
1112 }
1113
1114 void hmp_commit(Monitor *mon, const QDict *qdict)
1115 {
1116 const char *device = qdict_get_str(qdict, "device");
1117 BlockBackend *blk;
1118 int ret;
1119
1120 if (!strcmp(device, "all")) {
1121 ret = bdrv_commit_all();
1122 } else {
1123 BlockDriverState *bs;
1124 AioContext *aio_context;
1125
1126 blk = blk_by_name(device);
1127 if (!blk) {
1128 monitor_printf(mon, "Device '%s' not found\n", device);
1129 return;
1130 }
1131 if (!blk_is_available(blk)) {
1132 monitor_printf(mon, "Device '%s' has no medium\n", device);
1133 return;
1134 }
1135
1136 bs = blk_bs(blk);
1137 aio_context = bdrv_get_aio_context(bs);
1138 aio_context_acquire(aio_context);
1139
1140 ret = bdrv_commit(bs);
1141
1142 aio_context_release(aio_context);
1143 }
1144 if (ret < 0) {
1145 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1146 strerror(-ret));
1147 }
1148 }
1149
1150 static void blockdev_do_action(TransactionActionKind type, void *data,
1151 Error **errp)
1152 {
1153 TransactionAction action;
1154 TransactionActionList list;
1155
1156 action.type = type;
1157 action.u.data = data;
1158 list.value = &action;
1159 list.next = NULL;
1160 qmp_transaction(&list, errp);
1161 }
1162
1163 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1164 bool has_node_name, const char *node_name,
1165 const char *snapshot_file,
1166 bool has_snapshot_node_name,
1167 const char *snapshot_node_name,
1168 bool has_format, const char *format,
1169 bool has_mode, NewImageMode mode, Error **errp)
1170 {
1171 BlockdevSnapshotSync snapshot = {
1172 .has_device = has_device,
1173 .device = (char *) device,
1174 .has_node_name = has_node_name,
1175 .node_name = (char *) node_name,
1176 .snapshot_file = (char *) snapshot_file,
1177 .has_snapshot_node_name = has_snapshot_node_name,
1178 .snapshot_node_name = (char *) snapshot_node_name,
1179 .has_format = has_format,
1180 .format = (char *) format,
1181 .has_mode = has_mode,
1182 .mode = mode,
1183 };
1184 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1185 &snapshot, errp);
1186 }
1187
1188 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1189 Error **errp)
1190 {
1191 BlockdevSnapshot snapshot_data = {
1192 .node = (char *) node,
1193 .overlay = (char *) overlay
1194 };
1195
1196 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1197 &snapshot_data, errp);
1198 }
1199
1200 void qmp_blockdev_snapshot_internal_sync(const char *device,
1201 const char *name,
1202 Error **errp)
1203 {
1204 BlockdevSnapshotInternal snapshot = {
1205 .device = (char *) device,
1206 .name = (char *) name
1207 };
1208
1209 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1210 &snapshot, errp);
1211 }
1212
1213 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1214 bool has_id,
1215 const char *id,
1216 bool has_name,
1217 const char *name,
1218 Error **errp)
1219 {
1220 BlockDriverState *bs;
1221 BlockBackend *blk;
1222 AioContext *aio_context;
1223 QEMUSnapshotInfo sn;
1224 Error *local_err = NULL;
1225 SnapshotInfo *info = NULL;
1226 int ret;
1227
1228 blk = blk_by_name(device);
1229 if (!blk) {
1230 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1231 "Device '%s' not found", device);
1232 return NULL;
1233 }
1234
1235 aio_context = blk_get_aio_context(blk);
1236 aio_context_acquire(aio_context);
1237
1238 if (!has_id) {
1239 id = NULL;
1240 }
1241
1242 if (!has_name) {
1243 name = NULL;
1244 }
1245
1246 if (!id && !name) {
1247 error_setg(errp, "Name or id must be provided");
1248 goto out_aio_context;
1249 }
1250
1251 if (!blk_is_available(blk)) {
1252 error_setg(errp, "Device '%s' has no medium", device);
1253 goto out_aio_context;
1254 }
1255 bs = blk_bs(blk);
1256
1257 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1258 goto out_aio_context;
1259 }
1260
1261 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1262 if (local_err) {
1263 error_propagate(errp, local_err);
1264 goto out_aio_context;
1265 }
1266 if (!ret) {
1267 error_setg(errp,
1268 "Snapshot with id '%s' and name '%s' does not exist on "
1269 "device '%s'",
1270 STR_OR_NULL(id), STR_OR_NULL(name), device);
1271 goto out_aio_context;
1272 }
1273
1274 bdrv_snapshot_delete(bs, id, name, &local_err);
1275 if (local_err) {
1276 error_propagate(errp, local_err);
1277 goto out_aio_context;
1278 }
1279
1280 aio_context_release(aio_context);
1281
1282 info = g_new0(SnapshotInfo, 1);
1283 info->id = g_strdup(sn.id_str);
1284 info->name = g_strdup(sn.name);
1285 info->date_nsec = sn.date_nsec;
1286 info->date_sec = sn.date_sec;
1287 info->vm_state_size = sn.vm_state_size;
1288 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1289 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1290
1291 return info;
1292
1293 out_aio_context:
1294 aio_context_release(aio_context);
1295 return NULL;
1296 }
1297
1298 /**
1299 * block_dirty_bitmap_lookup:
1300 * Return a dirty bitmap (if present), after validating
1301 * the node reference and bitmap names.
1302 *
1303 * @node: The name of the BDS node to search for bitmaps
1304 * @name: The name of the bitmap to search for
1305 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1306 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1307 * @errp: Output pointer for error information. Can be NULL.
1308 *
1309 * @return: A bitmap object on success, or NULL on failure.
1310 */
1311 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1312 const char *name,
1313 BlockDriverState **pbs,
1314 AioContext **paio,
1315 Error **errp)
1316 {
1317 BlockDriverState *bs;
1318 BdrvDirtyBitmap *bitmap;
1319 AioContext *aio_context;
1320
1321 if (!node) {
1322 error_setg(errp, "Node cannot be NULL");
1323 return NULL;
1324 }
1325 if (!name) {
1326 error_setg(errp, "Bitmap name cannot be NULL");
1327 return NULL;
1328 }
1329 bs = bdrv_lookup_bs(node, node, NULL);
1330 if (!bs) {
1331 error_setg(errp, "Node '%s' not found", node);
1332 return NULL;
1333 }
1334
1335 aio_context = bdrv_get_aio_context(bs);
1336 aio_context_acquire(aio_context);
1337
1338 bitmap = bdrv_find_dirty_bitmap(bs, name);
1339 if (!bitmap) {
1340 error_setg(errp, "Dirty bitmap '%s' not found", name);
1341 goto fail;
1342 }
1343
1344 if (pbs) {
1345 *pbs = bs;
1346 }
1347 if (paio) {
1348 *paio = aio_context;
1349 } else {
1350 aio_context_release(aio_context);
1351 }
1352
1353 return bitmap;
1354
1355 fail:
1356 aio_context_release(aio_context);
1357 return NULL;
1358 }
1359
1360 /* New and old BlockDriverState structs for atomic group operations */
1361
1362 typedef struct BlkTransactionState BlkTransactionState;
1363
1364 /* Only prepare() may fail. In a single transaction, only one of commit() or
1365 abort() will be called, clean() will always be called if it present. */
1366 typedef struct BdrvActionOps {
1367 /* Size of state struct, in bytes. */
1368 size_t instance_size;
1369 /* Prepare the work, must NOT be NULL. */
1370 void (*prepare)(BlkTransactionState *common, Error **errp);
1371 /* Commit the changes, can be NULL. */
1372 void (*commit)(BlkTransactionState *common);
1373 /* Abort the changes on fail, can be NULL. */
1374 void (*abort)(BlkTransactionState *common);
1375 /* Clean up resource in the end, can be NULL. */
1376 void (*clean)(BlkTransactionState *common);
1377 } BdrvActionOps;
1378
1379 /*
1380 * This structure must be arranged as first member in child type, assuming
1381 * that compiler will also arrange it to the same address with parent instance.
1382 * Later it will be used in free().
1383 */
1384 struct BlkTransactionState {
1385 TransactionAction *action;
1386 const BdrvActionOps *ops;
1387 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1388 };
1389
1390 /* internal snapshot private data */
1391 typedef struct InternalSnapshotState {
1392 BlkTransactionState common;
1393 BlockDriverState *bs;
1394 AioContext *aio_context;
1395 QEMUSnapshotInfo sn;
1396 bool created;
1397 } InternalSnapshotState;
1398
1399 static void internal_snapshot_prepare(BlkTransactionState *common,
1400 Error **errp)
1401 {
1402 Error *local_err = NULL;
1403 const char *device;
1404 const char *name;
1405 BlockBackend *blk;
1406 BlockDriverState *bs;
1407 QEMUSnapshotInfo old_sn, *sn;
1408 bool ret;
1409 qemu_timeval tv;
1410 BlockdevSnapshotInternal *internal;
1411 InternalSnapshotState *state;
1412 int ret1;
1413
1414 g_assert(common->action->type ==
1415 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1416 internal = common->action->u.blockdev_snapshot_internal_sync;
1417 state = DO_UPCAST(InternalSnapshotState, common, common);
1418
1419 /* 1. parse input */
1420 device = internal->device;
1421 name = internal->name;
1422
1423 /* 2. check for validation */
1424 blk = blk_by_name(device);
1425 if (!blk) {
1426 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1427 "Device '%s' not found", device);
1428 return;
1429 }
1430
1431 /* AioContext is released in .clean() */
1432 state->aio_context = blk_get_aio_context(blk);
1433 aio_context_acquire(state->aio_context);
1434
1435 if (!blk_is_available(blk)) {
1436 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1437 return;
1438 }
1439 bs = blk_bs(blk);
1440
1441 state->bs = bs;
1442 bdrv_drained_begin(bs);
1443
1444 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1445 return;
1446 }
1447
1448 if (bdrv_is_read_only(bs)) {
1449 error_setg(errp, "Device '%s' is read only", device);
1450 return;
1451 }
1452
1453 if (!bdrv_can_snapshot(bs)) {
1454 error_setg(errp, "Block format '%s' used by device '%s' "
1455 "does not support internal snapshots",
1456 bs->drv->format_name, device);
1457 return;
1458 }
1459
1460 if (!strlen(name)) {
1461 error_setg(errp, "Name is empty");
1462 return;
1463 }
1464
1465 /* check whether a snapshot with name exist */
1466 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1467 &local_err);
1468 if (local_err) {
1469 error_propagate(errp, local_err);
1470 return;
1471 } else if (ret) {
1472 error_setg(errp,
1473 "Snapshot with name '%s' already exists on device '%s'",
1474 name, device);
1475 return;
1476 }
1477
1478 /* 3. take the snapshot */
1479 sn = &state->sn;
1480 pstrcpy(sn->name, sizeof(sn->name), name);
1481 qemu_gettimeofday(&tv);
1482 sn->date_sec = tv.tv_sec;
1483 sn->date_nsec = tv.tv_usec * 1000;
1484 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1485
1486 ret1 = bdrv_snapshot_create(bs, sn);
1487 if (ret1 < 0) {
1488 error_setg_errno(errp, -ret1,
1489 "Failed to create snapshot '%s' on device '%s'",
1490 name, device);
1491 return;
1492 }
1493
1494 /* 4. succeed, mark a snapshot is created */
1495 state->created = true;
1496 }
1497
1498 static void internal_snapshot_abort(BlkTransactionState *common)
1499 {
1500 InternalSnapshotState *state =
1501 DO_UPCAST(InternalSnapshotState, common, common);
1502 BlockDriverState *bs = state->bs;
1503 QEMUSnapshotInfo *sn = &state->sn;
1504 Error *local_error = NULL;
1505
1506 if (!state->created) {
1507 return;
1508 }
1509
1510 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1511 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1512 "device '%s' in abort: %s",
1513 sn->id_str,
1514 sn->name,
1515 bdrv_get_device_name(bs),
1516 error_get_pretty(local_error));
1517 error_free(local_error);
1518 }
1519 }
1520
1521 static void internal_snapshot_clean(BlkTransactionState *common)
1522 {
1523 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1524 common, common);
1525
1526 if (state->aio_context) {
1527 if (state->bs) {
1528 bdrv_drained_end(state->bs);
1529 }
1530 aio_context_release(state->aio_context);
1531 }
1532 }
1533
1534 /* external snapshot private data */
1535 typedef struct ExternalSnapshotState {
1536 BlkTransactionState common;
1537 BlockDriverState *old_bs;
1538 BlockDriverState *new_bs;
1539 AioContext *aio_context;
1540 } ExternalSnapshotState;
1541
1542 static void external_snapshot_prepare(BlkTransactionState *common,
1543 Error **errp)
1544 {
1545 int flags = 0, ret;
1546 QDict *options = NULL;
1547 Error *local_err = NULL;
1548 /* Device and node name of the image to generate the snapshot from */
1549 const char *device;
1550 const char *node_name;
1551 /* Reference to the new image (for 'blockdev-snapshot') */
1552 const char *snapshot_ref;
1553 /* File name of the new image (for 'blockdev-snapshot-sync') */
1554 const char *new_image_file;
1555 ExternalSnapshotState *state =
1556 DO_UPCAST(ExternalSnapshotState, common, common);
1557 TransactionAction *action = common->action;
1558
1559 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1560 * purpose but a different set of parameters */
1561 switch (action->type) {
1562 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1563 {
1564 BlockdevSnapshot *s = action->u.blockdev_snapshot;
1565 device = s->node;
1566 node_name = s->node;
1567 new_image_file = NULL;
1568 snapshot_ref = s->overlay;
1569 }
1570 break;
1571 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1572 {
1573 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1574 device = s->has_device ? s->device : NULL;
1575 node_name = s->has_node_name ? s->node_name : NULL;
1576 new_image_file = s->snapshot_file;
1577 snapshot_ref = NULL;
1578 }
1579 break;
1580 default:
1581 g_assert_not_reached();
1582 }
1583
1584 /* start processing */
1585 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1586 if (!state->old_bs) {
1587 return;
1588 }
1589
1590 /* Acquire AioContext now so any threads operating on old_bs stop */
1591 state->aio_context = bdrv_get_aio_context(state->old_bs);
1592 aio_context_acquire(state->aio_context);
1593 bdrv_drained_begin(state->old_bs);
1594
1595 if (!bdrv_is_inserted(state->old_bs)) {
1596 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1597 return;
1598 }
1599
1600 if (bdrv_op_is_blocked(state->old_bs,
1601 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1602 return;
1603 }
1604
1605 if (!bdrv_is_read_only(state->old_bs)) {
1606 if (bdrv_flush(state->old_bs)) {
1607 error_setg(errp, QERR_IO_ERROR);
1608 return;
1609 }
1610 }
1611
1612 if (!bdrv_is_first_non_filter(state->old_bs)) {
1613 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1614 return;
1615 }
1616
1617 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1618 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1619 const char *format = s->has_format ? s->format : "qcow2";
1620 enum NewImageMode mode;
1621 const char *snapshot_node_name =
1622 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1623
1624 if (node_name && !snapshot_node_name) {
1625 error_setg(errp, "New snapshot node name missing");
1626 return;
1627 }
1628
1629 if (snapshot_node_name &&
1630 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1631 error_setg(errp, "New snapshot node name already in use");
1632 return;
1633 }
1634
1635 flags = state->old_bs->open_flags;
1636
1637 /* create new image w/backing file */
1638 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1639 if (mode != NEW_IMAGE_MODE_EXISTING) {
1640 bdrv_img_create(new_image_file, format,
1641 state->old_bs->filename,
1642 state->old_bs->drv->format_name,
1643 NULL, -1, flags, &local_err, false);
1644 if (local_err) {
1645 error_propagate(errp, local_err);
1646 return;
1647 }
1648 }
1649
1650 options = qdict_new();
1651 if (s->has_snapshot_node_name) {
1652 qdict_put(options, "node-name",
1653 qstring_from_str(snapshot_node_name));
1654 }
1655 qdict_put(options, "driver", qstring_from_str(format));
1656
1657 flags |= BDRV_O_NO_BACKING;
1658 }
1659
1660 assert(state->new_bs == NULL);
1661 ret = bdrv_open(&state->new_bs, new_image_file, snapshot_ref, options,
1662 flags, errp);
1663 /* We will manually add the backing_hd field to the bs later */
1664 if (ret != 0) {
1665 return;
1666 }
1667
1668 if (state->new_bs->blk != NULL) {
1669 error_setg(errp, "The snapshot is already in use by %s",
1670 blk_name(state->new_bs->blk));
1671 return;
1672 }
1673
1674 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1675 errp)) {
1676 return;
1677 }
1678
1679 if (state->new_bs->backing != NULL) {
1680 error_setg(errp, "The snapshot already has a backing image");
1681 }
1682 }
1683
1684 static void external_snapshot_commit(BlkTransactionState *common)
1685 {
1686 ExternalSnapshotState *state =
1687 DO_UPCAST(ExternalSnapshotState, common, common);
1688
1689 bdrv_set_aio_context(state->new_bs, state->aio_context);
1690
1691 /* This removes our old bs and adds the new bs */
1692 bdrv_append(state->new_bs, state->old_bs);
1693 /* We don't need (or want) to use the transactional
1694 * bdrv_reopen_multiple() across all the entries at once, because we
1695 * don't want to abort all of them if one of them fails the reopen */
1696 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1697 NULL);
1698 }
1699
1700 static void external_snapshot_abort(BlkTransactionState *common)
1701 {
1702 ExternalSnapshotState *state =
1703 DO_UPCAST(ExternalSnapshotState, common, common);
1704 if (state->new_bs) {
1705 bdrv_unref(state->new_bs);
1706 }
1707 }
1708
1709 static void external_snapshot_clean(BlkTransactionState *common)
1710 {
1711 ExternalSnapshotState *state =
1712 DO_UPCAST(ExternalSnapshotState, common, common);
1713 if (state->aio_context) {
1714 bdrv_drained_end(state->old_bs);
1715 aio_context_release(state->aio_context);
1716 }
1717 }
1718
1719 typedef struct DriveBackupState {
1720 BlkTransactionState common;
1721 BlockDriverState *bs;
1722 AioContext *aio_context;
1723 BlockJob *job;
1724 } DriveBackupState;
1725
1726 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1727 {
1728 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1729 BlockBackend *blk;
1730 DriveBackup *backup;
1731 Error *local_err = NULL;
1732
1733 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1734 backup = common->action->u.drive_backup;
1735
1736 blk = blk_by_name(backup->device);
1737 if (!blk) {
1738 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1739 "Device '%s' not found", backup->device);
1740 return;
1741 }
1742
1743 if (!blk_is_available(blk)) {
1744 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1745 return;
1746 }
1747
1748 /* AioContext is released in .clean() */
1749 state->aio_context = blk_get_aio_context(blk);
1750 aio_context_acquire(state->aio_context);
1751 bdrv_drained_begin(blk_bs(blk));
1752 state->bs = blk_bs(blk);
1753
1754 qmp_drive_backup(backup->device, backup->target,
1755 backup->has_format, backup->format,
1756 backup->sync,
1757 backup->has_mode, backup->mode,
1758 backup->has_speed, backup->speed,
1759 backup->has_bitmap, backup->bitmap,
1760 backup->has_on_source_error, backup->on_source_error,
1761 backup->has_on_target_error, backup->on_target_error,
1762 &local_err);
1763 if (local_err) {
1764 error_propagate(errp, local_err);
1765 return;
1766 }
1767
1768 state->job = state->bs->job;
1769 }
1770
1771 static void drive_backup_abort(BlkTransactionState *common)
1772 {
1773 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1774 BlockDriverState *bs = state->bs;
1775
1776 /* Only cancel if it's the job we started */
1777 if (bs && bs->job && bs->job == state->job) {
1778 block_job_cancel_sync(bs->job);
1779 }
1780 }
1781
1782 static void drive_backup_clean(BlkTransactionState *common)
1783 {
1784 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1785
1786 if (state->aio_context) {
1787 bdrv_drained_end(state->bs);
1788 aio_context_release(state->aio_context);
1789 }
1790 }
1791
1792 typedef struct BlockdevBackupState {
1793 BlkTransactionState common;
1794 BlockDriverState *bs;
1795 BlockJob *job;
1796 AioContext *aio_context;
1797 } BlockdevBackupState;
1798
1799 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
1800 {
1801 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1802 BlockdevBackup *backup;
1803 BlockBackend *blk, *target;
1804 Error *local_err = NULL;
1805
1806 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1807 backup = common->action->u.blockdev_backup;
1808
1809 blk = blk_by_name(backup->device);
1810 if (!blk) {
1811 error_setg(errp, "Device '%s' not found", backup->device);
1812 return;
1813 }
1814
1815 if (!blk_is_available(blk)) {
1816 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1817 return;
1818 }
1819
1820 target = blk_by_name(backup->target);
1821 if (!target) {
1822 error_setg(errp, "Device '%s' not found", backup->target);
1823 return;
1824 }
1825
1826 /* AioContext is released in .clean() */
1827 state->aio_context = blk_get_aio_context(blk);
1828 if (state->aio_context != blk_get_aio_context(target)) {
1829 state->aio_context = NULL;
1830 error_setg(errp, "Backup between two IO threads is not implemented");
1831 return;
1832 }
1833 aio_context_acquire(state->aio_context);
1834 state->bs = blk_bs(blk);
1835 bdrv_drained_begin(state->bs);
1836
1837 qmp_blockdev_backup(backup->device, backup->target,
1838 backup->sync,
1839 backup->has_speed, backup->speed,
1840 backup->has_on_source_error, backup->on_source_error,
1841 backup->has_on_target_error, backup->on_target_error,
1842 &local_err);
1843 if (local_err) {
1844 error_propagate(errp, local_err);
1845 return;
1846 }
1847
1848 state->job = state->bs->job;
1849 }
1850
1851 static void blockdev_backup_abort(BlkTransactionState *common)
1852 {
1853 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1854 BlockDriverState *bs = state->bs;
1855
1856 /* Only cancel if it's the job we started */
1857 if (bs && bs->job && bs->job == state->job) {
1858 block_job_cancel_sync(bs->job);
1859 }
1860 }
1861
1862 static void blockdev_backup_clean(BlkTransactionState *common)
1863 {
1864 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1865
1866 if (state->aio_context) {
1867 bdrv_drained_end(state->bs);
1868 aio_context_release(state->aio_context);
1869 }
1870 }
1871
1872 static void abort_prepare(BlkTransactionState *common, Error **errp)
1873 {
1874 error_setg(errp, "Transaction aborted using Abort action");
1875 }
1876
1877 static void abort_commit(BlkTransactionState *common)
1878 {
1879 g_assert_not_reached(); /* this action never succeeds */
1880 }
1881
1882 static const BdrvActionOps actions[] = {
1883 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
1884 .instance_size = sizeof(ExternalSnapshotState),
1885 .prepare = external_snapshot_prepare,
1886 .commit = external_snapshot_commit,
1887 .abort = external_snapshot_abort,
1888 },
1889 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1890 .instance_size = sizeof(ExternalSnapshotState),
1891 .prepare = external_snapshot_prepare,
1892 .commit = external_snapshot_commit,
1893 .abort = external_snapshot_abort,
1894 .clean = external_snapshot_clean,
1895 },
1896 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1897 .instance_size = sizeof(DriveBackupState),
1898 .prepare = drive_backup_prepare,
1899 .abort = drive_backup_abort,
1900 .clean = drive_backup_clean,
1901 },
1902 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
1903 .instance_size = sizeof(BlockdevBackupState),
1904 .prepare = blockdev_backup_prepare,
1905 .abort = blockdev_backup_abort,
1906 .clean = blockdev_backup_clean,
1907 },
1908 [TRANSACTION_ACTION_KIND_ABORT] = {
1909 .instance_size = sizeof(BlkTransactionState),
1910 .prepare = abort_prepare,
1911 .commit = abort_commit,
1912 },
1913 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1914 .instance_size = sizeof(InternalSnapshotState),
1915 .prepare = internal_snapshot_prepare,
1916 .abort = internal_snapshot_abort,
1917 .clean = internal_snapshot_clean,
1918 },
1919 };
1920
1921 /*
1922 * 'Atomic' group operations. The operations are performed as a set, and if
1923 * any fail then we roll back all operations in the group.
1924 */
1925 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1926 {
1927 TransactionActionList *dev_entry = dev_list;
1928 BlkTransactionState *state, *next;
1929 Error *local_err = NULL;
1930
1931 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1932 QSIMPLEQ_INIT(&snap_bdrv_states);
1933
1934 /* drain all i/o before any operations */
1935 bdrv_drain_all();
1936
1937 /* We don't do anything in this loop that commits us to the operations */
1938 while (NULL != dev_entry) {
1939 TransactionAction *dev_info = NULL;
1940 const BdrvActionOps *ops;
1941
1942 dev_info = dev_entry->value;
1943 dev_entry = dev_entry->next;
1944
1945 assert(dev_info->type < ARRAY_SIZE(actions));
1946
1947 ops = &actions[dev_info->type];
1948 assert(ops->instance_size > 0);
1949
1950 state = g_malloc0(ops->instance_size);
1951 state->ops = ops;
1952 state->action = dev_info;
1953 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1954
1955 state->ops->prepare(state, &local_err);
1956 if (local_err) {
1957 error_propagate(errp, local_err);
1958 goto delete_and_fail;
1959 }
1960 }
1961
1962 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1963 if (state->ops->commit) {
1964 state->ops->commit(state);
1965 }
1966 }
1967
1968 /* success */
1969 goto exit;
1970
1971 delete_and_fail:
1972 /* failure, and it is all-or-none; roll back all operations */
1973 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1974 if (state->ops->abort) {
1975 state->ops->abort(state);
1976 }
1977 }
1978 exit:
1979 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1980 if (state->ops->clean) {
1981 state->ops->clean(state);
1982 }
1983 g_free(state);
1984 }
1985 }
1986
1987 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1988 {
1989 Error *local_err = NULL;
1990
1991 qmp_blockdev_open_tray(device, has_force, force, &local_err);
1992 if (local_err) {
1993 error_propagate(errp, local_err);
1994 return;
1995 }
1996
1997 qmp_blockdev_remove_medium(device, errp);
1998 }
1999
2000 void qmp_block_passwd(bool has_device, const char *device,
2001 bool has_node_name, const char *node_name,
2002 const char *password, Error **errp)
2003 {
2004 Error *local_err = NULL;
2005 BlockDriverState *bs;
2006 AioContext *aio_context;
2007
2008 bs = bdrv_lookup_bs(has_device ? device : NULL,
2009 has_node_name ? node_name : NULL,
2010 &local_err);
2011 if (local_err) {
2012 error_propagate(errp, local_err);
2013 return;
2014 }
2015
2016 aio_context = bdrv_get_aio_context(bs);
2017 aio_context_acquire(aio_context);
2018
2019 bdrv_add_key(bs, password, errp);
2020
2021 aio_context_release(aio_context);
2022 }
2023
2024 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force,
2025 Error **errp)
2026 {
2027 BlockBackend *blk;
2028 bool locked;
2029
2030 if (!has_force) {
2031 force = false;
2032 }
2033
2034 blk = blk_by_name(device);
2035 if (!blk) {
2036 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2037 "Device '%s' not found", device);
2038 return;
2039 }
2040
2041 if (!blk_dev_has_removable_media(blk)) {
2042 error_setg(errp, "Device '%s' is not removable", device);
2043 return;
2044 }
2045
2046 if (blk_dev_is_tray_open(blk)) {
2047 return;
2048 }
2049
2050 locked = blk_dev_is_medium_locked(blk);
2051 if (locked) {
2052 blk_dev_eject_request(blk, force);
2053 }
2054
2055 if (!locked || force) {
2056 blk_dev_change_media_cb(blk, false);
2057 }
2058 }
2059
2060 void qmp_blockdev_close_tray(const char *device, Error **errp)
2061 {
2062 BlockBackend *blk;
2063
2064 blk = blk_by_name(device);
2065 if (!blk) {
2066 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2067 "Device '%s' not found", device);
2068 return;
2069 }
2070
2071 if (!blk_dev_has_removable_media(blk)) {
2072 error_setg(errp, "Device '%s' is not removable", device);
2073 return;
2074 }
2075
2076 if (!blk_dev_is_tray_open(blk)) {
2077 return;
2078 }
2079
2080 blk_dev_change_media_cb(blk, true);
2081 }
2082
2083 void qmp_blockdev_remove_medium(const char *device, Error **errp)
2084 {
2085 BlockBackend *blk;
2086 BlockDriverState *bs;
2087 AioContext *aio_context;
2088 bool has_device;
2089
2090 blk = blk_by_name(device);
2091 if (!blk) {
2092 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2093 "Device '%s' not found", device);
2094 return;
2095 }
2096
2097 /* For BBs without a device, we can exchange the BDS tree at will */
2098 has_device = blk_get_attached_dev(blk);
2099
2100 if (has_device && !blk_dev_has_removable_media(blk)) {
2101 error_setg(errp, "Device '%s' is not removable", device);
2102 return;
2103 }
2104
2105 if (has_device && !blk_dev_is_tray_open(blk)) {
2106 error_setg(errp, "Tray of device '%s' is not open", device);
2107 return;
2108 }
2109
2110 bs = blk_bs(blk);
2111 if (!bs) {
2112 return;
2113 }
2114
2115 aio_context = bdrv_get_aio_context(bs);
2116 aio_context_acquire(aio_context);
2117
2118 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2119 goto out;
2120 }
2121
2122 /* This follows the convention established by bdrv_make_anon() */
2123 if (bs->device_list.tqe_prev) {
2124 QTAILQ_REMOVE(&bdrv_states, bs, device_list);
2125 bs->device_list.tqe_prev = NULL;
2126 }
2127
2128 blk_remove_bs(blk);
2129
2130 out:
2131 aio_context_release(aio_context);
2132 }
2133
2134 static void qmp_blockdev_insert_anon_medium(const char *device,
2135 BlockDriverState *bs, Error **errp)
2136 {
2137 BlockBackend *blk;
2138 bool has_device;
2139
2140 blk = blk_by_name(device);
2141 if (!blk) {
2142 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2143 "Device '%s' not found", device);
2144 return;
2145 }
2146
2147 /* For BBs without a device, we can exchange the BDS tree at will */
2148 has_device = blk_get_attached_dev(blk);
2149
2150 if (has_device && !blk_dev_has_removable_media(blk)) {
2151 error_setg(errp, "Device '%s' is not removable", device);
2152 return;
2153 }
2154
2155 if (has_device && !blk_dev_is_tray_open(blk)) {
2156 error_setg(errp, "Tray of device '%s' is not open", device);
2157 return;
2158 }
2159
2160 if (blk_bs(blk)) {
2161 error_setg(errp, "There already is a medium in device '%s'", device);
2162 return;
2163 }
2164
2165 blk_insert_bs(blk, bs);
2166
2167 QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list);
2168 }
2169
2170 void qmp_blockdev_insert_medium(const char *device, const char *node_name,
2171 Error **errp)
2172 {
2173 BlockDriverState *bs;
2174
2175 bs = bdrv_find_node(node_name);
2176 if (!bs) {
2177 error_setg(errp, "Node '%s' not found", node_name);
2178 return;
2179 }
2180
2181 if (bs->blk) {
2182 error_setg(errp, "Node '%s' is already in use by '%s'", node_name,
2183 blk_name(bs->blk));
2184 return;
2185 }
2186
2187 qmp_blockdev_insert_anon_medium(device, bs, errp);
2188 }
2189
2190 void qmp_blockdev_change_medium(const char *device, const char *filename,
2191 bool has_format, const char *format,
2192 bool has_read_only,
2193 BlockdevChangeReadOnlyMode read_only,
2194 Error **errp)
2195 {
2196 BlockBackend *blk;
2197 BlockDriverState *medium_bs = NULL;
2198 int bdrv_flags, ret;
2199 QDict *options = NULL;
2200 Error *err = NULL;
2201
2202 blk = blk_by_name(device);
2203 if (!blk) {
2204 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2205 "Device '%s' not found", device);
2206 goto fail;
2207 }
2208
2209 if (blk_bs(blk)) {
2210 blk_update_root_state(blk);
2211 }
2212
2213 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2214
2215 if (!has_read_only) {
2216 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2217 }
2218
2219 switch (read_only) {
2220 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2221 break;
2222
2223 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2224 bdrv_flags &= ~BDRV_O_RDWR;
2225 break;
2226
2227 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2228 bdrv_flags |= BDRV_O_RDWR;
2229 break;
2230
2231 default:
2232 abort();
2233 }
2234
2235 if (has_format) {
2236 options = qdict_new();
2237 qdict_put(options, "driver", qstring_from_str(format));
2238 }
2239
2240 assert(!medium_bs);
2241 ret = bdrv_open(&medium_bs, filename, NULL, options, bdrv_flags, errp);
2242 if (ret < 0) {
2243 goto fail;
2244 }
2245
2246 blk_apply_root_state(blk, medium_bs);
2247
2248 bdrv_add_key(medium_bs, NULL, &err);
2249 if (err) {
2250 error_propagate(errp, err);
2251 goto fail;
2252 }
2253
2254 qmp_blockdev_open_tray(device, false, false, &err);
2255 if (err) {
2256 error_propagate(errp, err);
2257 goto fail;
2258 }
2259
2260 qmp_blockdev_remove_medium(device, &err);
2261 if (err) {
2262 error_propagate(errp, err);
2263 goto fail;
2264 }
2265
2266 qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
2267 if (err) {
2268 error_propagate(errp, err);
2269 goto fail;
2270 }
2271
2272 qmp_blockdev_close_tray(device, errp);
2273
2274 fail:
2275 /* If the medium has been inserted, the device has its own reference, so
2276 * ours must be relinquished; and if it has not been inserted successfully,
2277 * the reference must be relinquished anyway */
2278 bdrv_unref(medium_bs);
2279 }
2280
2281 /* throttling disk I/O limits */
2282 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2283 int64_t bps_wr,
2284 int64_t iops,
2285 int64_t iops_rd,
2286 int64_t iops_wr,
2287 bool has_bps_max,
2288 int64_t bps_max,
2289 bool has_bps_rd_max,
2290 int64_t bps_rd_max,
2291 bool has_bps_wr_max,
2292 int64_t bps_wr_max,
2293 bool has_iops_max,
2294 int64_t iops_max,
2295 bool has_iops_rd_max,
2296 int64_t iops_rd_max,
2297 bool has_iops_wr_max,
2298 int64_t iops_wr_max,
2299 bool has_iops_size,
2300 int64_t iops_size,
2301 bool has_group,
2302 const char *group, Error **errp)
2303 {
2304 ThrottleConfig cfg;
2305 BlockDriverState *bs;
2306 BlockBackend *blk;
2307 AioContext *aio_context;
2308
2309 blk = blk_by_name(device);
2310 if (!blk) {
2311 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2312 "Device '%s' not found", device);
2313 return;
2314 }
2315
2316 aio_context = blk_get_aio_context(blk);
2317 aio_context_acquire(aio_context);
2318
2319 bs = blk_bs(blk);
2320 if (!bs) {
2321 error_setg(errp, "Device '%s' has no medium", device);
2322 goto out;
2323 }
2324
2325 memset(&cfg, 0, sizeof(cfg));
2326 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2327 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2328 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2329
2330 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2331 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2332 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2333
2334 if (has_bps_max) {
2335 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2336 }
2337 if (has_bps_rd_max) {
2338 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2339 }
2340 if (has_bps_wr_max) {
2341 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2342 }
2343 if (has_iops_max) {
2344 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2345 }
2346 if (has_iops_rd_max) {
2347 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2348 }
2349 if (has_iops_wr_max) {
2350 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2351 }
2352
2353 if (has_iops_size) {
2354 cfg.op_size = iops_size;
2355 }
2356
2357 if (!check_throttle_config(&cfg, errp)) {
2358 goto out;
2359 }
2360
2361 if (throttle_enabled(&cfg)) {
2362 /* Enable I/O limits if they're not enabled yet, otherwise
2363 * just update the throttling group. */
2364 if (!bs->io_limits_enabled) {
2365 bdrv_io_limits_enable(bs, has_group ? group : device);
2366 } else if (has_group) {
2367 bdrv_io_limits_update_group(bs, group);
2368 }
2369 /* Set the new throttling configuration */
2370 bdrv_set_io_limits(bs, &cfg);
2371 } else if (bs->io_limits_enabled) {
2372 /* If all throttling settings are set to 0, disable I/O limits */
2373 bdrv_io_limits_disable(bs);
2374 }
2375
2376 out:
2377 aio_context_release(aio_context);
2378 }
2379
2380 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2381 bool has_granularity, uint32_t granularity,
2382 Error **errp)
2383 {
2384 AioContext *aio_context;
2385 BlockDriverState *bs;
2386
2387 if (!name || name[0] == '\0') {
2388 error_setg(errp, "Bitmap name cannot be empty");
2389 return;
2390 }
2391
2392 bs = bdrv_lookup_bs(node, node, errp);
2393 if (!bs) {
2394 return;
2395 }
2396
2397 aio_context = bdrv_get_aio_context(bs);
2398 aio_context_acquire(aio_context);
2399
2400 if (has_granularity) {
2401 if (granularity < 512 || !is_power_of_2(granularity)) {
2402 error_setg(errp, "Granularity must be power of 2 "
2403 "and at least 512");
2404 goto out;
2405 }
2406 } else {
2407 /* Default to cluster size, if available: */
2408 granularity = bdrv_get_default_bitmap_granularity(bs);
2409 }
2410
2411 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2412
2413 out:
2414 aio_context_release(aio_context);
2415 }
2416
2417 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2418 Error **errp)
2419 {
2420 AioContext *aio_context;
2421 BlockDriverState *bs;
2422 BdrvDirtyBitmap *bitmap;
2423
2424 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2425 if (!bitmap || !bs) {
2426 return;
2427 }
2428
2429 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2430 error_setg(errp,
2431 "Bitmap '%s' is currently frozen and cannot be removed",
2432 name);
2433 goto out;
2434 }
2435 bdrv_dirty_bitmap_make_anon(bitmap);
2436 bdrv_release_dirty_bitmap(bs, bitmap);
2437
2438 out:
2439 aio_context_release(aio_context);
2440 }
2441
2442 /**
2443 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2444 * immediately after a full backup operation.
2445 */
2446 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2447 Error **errp)
2448 {
2449 AioContext *aio_context;
2450 BdrvDirtyBitmap *bitmap;
2451 BlockDriverState *bs;
2452
2453 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2454 if (!bitmap || !bs) {
2455 return;
2456 }
2457
2458 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2459 error_setg(errp,
2460 "Bitmap '%s' is currently frozen and cannot be modified",
2461 name);
2462 goto out;
2463 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2464 error_setg(errp,
2465 "Bitmap '%s' is currently disabled and cannot be cleared",
2466 name);
2467 goto out;
2468 }
2469
2470 bdrv_clear_dirty_bitmap(bitmap);
2471
2472 out:
2473 aio_context_release(aio_context);
2474 }
2475
2476 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2477 {
2478 const char *id = qdict_get_str(qdict, "id");
2479 BlockBackend *blk;
2480 BlockDriverState *bs;
2481 AioContext *aio_context;
2482 Error *local_err = NULL;
2483
2484 blk = blk_by_name(id);
2485 if (!blk) {
2486 error_report("Device '%s' not found", id);
2487 return;
2488 }
2489
2490 if (!blk_legacy_dinfo(blk)) {
2491 error_report("Deleting device added with blockdev-add"
2492 " is not supported");
2493 return;
2494 }
2495
2496 aio_context = blk_get_aio_context(blk);
2497 aio_context_acquire(aio_context);
2498
2499 bs = blk_bs(blk);
2500 if (bs) {
2501 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2502 error_report_err(local_err);
2503 aio_context_release(aio_context);
2504 return;
2505 }
2506
2507 bdrv_close(bs);
2508 }
2509
2510 /* if we have a device attached to this BlockDriverState
2511 * then we need to make the drive anonymous until the device
2512 * can be removed. If this is a drive with no device backing
2513 * then we can just get rid of the block driver state right here.
2514 */
2515 if (blk_get_attached_dev(blk)) {
2516 blk_hide_on_behalf_of_hmp_drive_del(blk);
2517 /* Further I/O must not pause the guest */
2518 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2519 BLOCKDEV_ON_ERROR_REPORT);
2520 } else {
2521 blk_unref(blk);
2522 }
2523
2524 aio_context_release(aio_context);
2525 }
2526
2527 void qmp_block_resize(bool has_device, const char *device,
2528 bool has_node_name, const char *node_name,
2529 int64_t size, Error **errp)
2530 {
2531 Error *local_err = NULL;
2532 BlockDriverState *bs;
2533 AioContext *aio_context;
2534 int ret;
2535
2536 bs = bdrv_lookup_bs(has_device ? device : NULL,
2537 has_node_name ? node_name : NULL,
2538 &local_err);
2539 if (local_err) {
2540 error_propagate(errp, local_err);
2541 return;
2542 }
2543
2544 aio_context = bdrv_get_aio_context(bs);
2545 aio_context_acquire(aio_context);
2546
2547 if (!bdrv_is_first_non_filter(bs)) {
2548 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2549 goto out;
2550 }
2551
2552 if (size < 0) {
2553 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2554 goto out;
2555 }
2556
2557 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2558 error_setg(errp, QERR_DEVICE_IN_USE, device);
2559 goto out;
2560 }
2561
2562 /* complete all in-flight operations before resizing the device */
2563 bdrv_drain_all();
2564
2565 ret = bdrv_truncate(bs, size);
2566 switch (ret) {
2567 case 0:
2568 break;
2569 case -ENOMEDIUM:
2570 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2571 break;
2572 case -ENOTSUP:
2573 error_setg(errp, QERR_UNSUPPORTED);
2574 break;
2575 case -EACCES:
2576 error_setg(errp, "Device '%s' is read only", device);
2577 break;
2578 case -EBUSY:
2579 error_setg(errp, QERR_DEVICE_IN_USE, device);
2580 break;
2581 default:
2582 error_setg_errno(errp, -ret, "Could not resize");
2583 break;
2584 }
2585
2586 out:
2587 aio_context_release(aio_context);
2588 }
2589
2590 static void block_job_cb(void *opaque, int ret)
2591 {
2592 /* Note that this function may be executed from another AioContext besides
2593 * the QEMU main loop. If you need to access anything that assumes the
2594 * QEMU global mutex, use a BH or introduce a mutex.
2595 */
2596
2597 BlockDriverState *bs = opaque;
2598 const char *msg = NULL;
2599
2600 trace_block_job_cb(bs, bs->job, ret);
2601
2602 assert(bs->job);
2603
2604 if (ret < 0) {
2605 msg = strerror(-ret);
2606 }
2607
2608 if (block_job_is_cancelled(bs->job)) {
2609 block_job_event_cancelled(bs->job);
2610 } else {
2611 block_job_event_completed(bs->job, msg);
2612 }
2613
2614 bdrv_put_ref_bh_schedule(bs);
2615 }
2616
2617 void qmp_block_stream(const char *device,
2618 bool has_base, const char *base,
2619 bool has_backing_file, const char *backing_file,
2620 bool has_speed, int64_t speed,
2621 bool has_on_error, BlockdevOnError on_error,
2622 Error **errp)
2623 {
2624 BlockBackend *blk;
2625 BlockDriverState *bs;
2626 BlockDriverState *base_bs = NULL;
2627 AioContext *aio_context;
2628 Error *local_err = NULL;
2629 const char *base_name = NULL;
2630
2631 if (!has_on_error) {
2632 on_error = BLOCKDEV_ON_ERROR_REPORT;
2633 }
2634
2635 blk = blk_by_name(device);
2636 if (!blk) {
2637 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2638 "Device '%s' not found", device);
2639 return;
2640 }
2641
2642 aio_context = blk_get_aio_context(blk);
2643 aio_context_acquire(aio_context);
2644
2645 if (!blk_is_available(blk)) {
2646 error_setg(errp, "Device '%s' has no medium", device);
2647 goto out;
2648 }
2649 bs = blk_bs(blk);
2650
2651 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2652 goto out;
2653 }
2654
2655 if (has_base) {
2656 base_bs = bdrv_find_backing_image(bs, base);
2657 if (base_bs == NULL) {
2658 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2659 goto out;
2660 }
2661 assert(bdrv_get_aio_context(base_bs) == aio_context);
2662 base_name = base;
2663 }
2664
2665 /* if we are streaming the entire chain, the result will have no backing
2666 * file, and specifying one is therefore an error */
2667 if (base_bs == NULL && has_backing_file) {
2668 error_setg(errp, "backing file specified, but streaming the "
2669 "entire chain");
2670 goto out;
2671 }
2672
2673 /* backing_file string overrides base bs filename */
2674 base_name = has_backing_file ? backing_file : base_name;
2675
2676 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2677 on_error, block_job_cb, bs, &local_err);
2678 if (local_err) {
2679 error_propagate(errp, local_err);
2680 goto out;
2681 }
2682
2683 trace_qmp_block_stream(bs, bs->job);
2684
2685 out:
2686 aio_context_release(aio_context);
2687 }
2688
2689 void qmp_block_commit(const char *device,
2690 bool has_base, const char *base,
2691 bool has_top, const char *top,
2692 bool has_backing_file, const char *backing_file,
2693 bool has_speed, int64_t speed,
2694 Error **errp)
2695 {
2696 BlockBackend *blk;
2697 BlockDriverState *bs;
2698 BlockDriverState *base_bs, *top_bs;
2699 AioContext *aio_context;
2700 Error *local_err = NULL;
2701 /* This will be part of the QMP command, if/when the
2702 * BlockdevOnError change for blkmirror makes it in
2703 */
2704 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2705
2706 if (!has_speed) {
2707 speed = 0;
2708 }
2709
2710 /* Important Note:
2711 * libvirt relies on the DeviceNotFound error class in order to probe for
2712 * live commit feature versions; for this to work, we must make sure to
2713 * perform the device lookup before any generic errors that may occur in a
2714 * scenario in which all optional arguments are omitted. */
2715 blk = blk_by_name(device);
2716 if (!blk) {
2717 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2718 "Device '%s' not found", device);
2719 return;
2720 }
2721
2722 aio_context = blk_get_aio_context(blk);
2723 aio_context_acquire(aio_context);
2724
2725 if (!blk_is_available(blk)) {
2726 error_setg(errp, "Device '%s' has no medium", device);
2727 goto out;
2728 }
2729 bs = blk_bs(blk);
2730
2731 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2732 goto out;
2733 }
2734
2735 /* default top_bs is the active layer */
2736 top_bs = bs;
2737
2738 if (has_top && top) {
2739 if (strcmp(bs->filename, top) != 0) {
2740 top_bs = bdrv_find_backing_image(bs, top);
2741 }
2742 }
2743
2744 if (top_bs == NULL) {
2745 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2746 goto out;
2747 }
2748
2749 assert(bdrv_get_aio_context(top_bs) == aio_context);
2750
2751 if (has_base && base) {
2752 base_bs = bdrv_find_backing_image(top_bs, base);
2753 } else {
2754 base_bs = bdrv_find_base(top_bs);
2755 }
2756
2757 if (base_bs == NULL) {
2758 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2759 goto out;
2760 }
2761
2762 assert(bdrv_get_aio_context(base_bs) == aio_context);
2763
2764 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2765 goto out;
2766 }
2767
2768 /* Do not allow attempts to commit an image into itself */
2769 if (top_bs == base_bs) {
2770 error_setg(errp, "cannot commit an image into itself");
2771 goto out;
2772 }
2773
2774 if (top_bs == bs) {
2775 if (has_backing_file) {
2776 error_setg(errp, "'backing-file' specified,"
2777 " but 'top' is the active layer");
2778 goto out;
2779 }
2780 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2781 bs, &local_err);
2782 } else {
2783 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2784 has_backing_file ? backing_file : NULL, &local_err);
2785 }
2786 if (local_err != NULL) {
2787 error_propagate(errp, local_err);
2788 goto out;
2789 }
2790
2791 out:
2792 aio_context_release(aio_context);
2793 }
2794
2795 void qmp_drive_backup(const char *device, const char *target,
2796 bool has_format, const char *format,
2797 enum MirrorSyncMode sync,
2798 bool has_mode, enum NewImageMode mode,
2799 bool has_speed, int64_t speed,
2800 bool has_bitmap, const char *bitmap,
2801 bool has_on_source_error, BlockdevOnError on_source_error,
2802 bool has_on_target_error, BlockdevOnError on_target_error,
2803 Error **errp)
2804 {
2805 BlockBackend *blk;
2806 BlockDriverState *bs;
2807 BlockDriverState *target_bs;
2808 BlockDriverState *source = NULL;
2809 BdrvDirtyBitmap *bmap = NULL;
2810 AioContext *aio_context;
2811 QDict *options = NULL;
2812 Error *local_err = NULL;
2813 int flags;
2814 int64_t size;
2815 int ret;
2816
2817 if (!has_speed) {
2818 speed = 0;
2819 }
2820 if (!has_on_source_error) {
2821 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2822 }
2823 if (!has_on_target_error) {
2824 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2825 }
2826 if (!has_mode) {
2827 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2828 }
2829
2830 blk = blk_by_name(device);
2831 if (!blk) {
2832 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2833 "Device '%s' not found", device);
2834 return;
2835 }
2836
2837 aio_context = blk_get_aio_context(blk);
2838 aio_context_acquire(aio_context);
2839
2840 /* Although backup_run has this check too, we need to use bs->drv below, so
2841 * do an early check redundantly. */
2842 if (!blk_is_available(blk)) {
2843 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2844 goto out;
2845 }
2846 bs = blk_bs(blk);
2847
2848 if (!has_format) {
2849 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2850 }
2851
2852 /* Early check to avoid creating target */
2853 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2854 goto out;
2855 }
2856
2857 flags = bs->open_flags | BDRV_O_RDWR;
2858
2859 /* See if we have a backing HD we can use to create our new image
2860 * on top of. */
2861 if (sync == MIRROR_SYNC_MODE_TOP) {
2862 source = backing_bs(bs);
2863 if (!source) {
2864 sync = MIRROR_SYNC_MODE_FULL;
2865 }
2866 }
2867 if (sync == MIRROR_SYNC_MODE_NONE) {
2868 source = bs;
2869 }
2870
2871 size = bdrv_getlength(bs);
2872 if (size < 0) {
2873 error_setg_errno(errp, -size, "bdrv_getlength failed");
2874 goto out;
2875 }
2876
2877 if (mode != NEW_IMAGE_MODE_EXISTING) {
2878 assert(format);
2879 if (source) {
2880 bdrv_img_create(target, format, source->filename,
2881 source->drv->format_name, NULL,
2882 size, flags, &local_err, false);
2883 } else {
2884 bdrv_img_create(target, format, NULL, NULL, NULL,
2885 size, flags, &local_err, false);
2886 }
2887 }
2888
2889 if (local_err) {
2890 error_propagate(errp, local_err);
2891 goto out;
2892 }
2893
2894 if (format) {
2895 options = qdict_new();
2896 qdict_put(options, "driver", qstring_from_str(format));
2897 }
2898
2899 target_bs = NULL;
2900 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
2901 if (ret < 0) {
2902 error_propagate(errp, local_err);
2903 goto out;
2904 }
2905
2906 bdrv_set_aio_context(target_bs, aio_context);
2907
2908 if (has_bitmap) {
2909 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
2910 if (!bmap) {
2911 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
2912 goto out;
2913 }
2914 }
2915
2916 backup_start(bs, target_bs, speed, sync, bmap,
2917 on_source_error, on_target_error,
2918 block_job_cb, bs, &local_err);
2919 if (local_err != NULL) {
2920 bdrv_unref(target_bs);
2921 error_propagate(errp, local_err);
2922 goto out;
2923 }
2924
2925 out:
2926 aio_context_release(aio_context);
2927 }
2928
2929 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2930 {
2931 return bdrv_named_nodes_list(errp);
2932 }
2933
2934 void qmp_blockdev_backup(const char *device, const char *target,
2935 enum MirrorSyncMode sync,
2936 bool has_speed, int64_t speed,
2937 bool has_on_source_error,
2938 BlockdevOnError on_source_error,
2939 bool has_on_target_error,
2940 BlockdevOnError on_target_error,
2941 Error **errp)
2942 {
2943 BlockBackend *blk, *target_blk;
2944 BlockDriverState *bs;
2945 BlockDriverState *target_bs;
2946 Error *local_err = NULL;
2947 AioContext *aio_context;
2948
2949 if (!has_speed) {
2950 speed = 0;
2951 }
2952 if (!has_on_source_error) {
2953 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2954 }
2955 if (!has_on_target_error) {
2956 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2957 }
2958
2959 blk = blk_by_name(device);
2960 if (!blk) {
2961 error_setg(errp, "Device '%s' not found", device);
2962 return;
2963 }
2964
2965 aio_context = blk_get_aio_context(blk);
2966 aio_context_acquire(aio_context);
2967
2968 if (!blk_is_available(blk)) {
2969 error_setg(errp, "Device '%s' has no medium", device);
2970 goto out;
2971 }
2972 bs = blk_bs(blk);
2973
2974 target_blk = blk_by_name(target);
2975 if (!target_blk) {
2976 error_setg(errp, "Device '%s' not found", target);
2977 goto out;
2978 }
2979
2980 if (!blk_is_available(target_blk)) {
2981 error_setg(errp, "Device '%s' has no medium", target);
2982 goto out;
2983 }
2984 target_bs = blk_bs(target_blk);
2985
2986 bdrv_ref(target_bs);
2987 bdrv_set_aio_context(target_bs, aio_context);
2988 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
2989 on_target_error, block_job_cb, bs, &local_err);
2990 if (local_err != NULL) {
2991 bdrv_unref(target_bs);
2992 error_propagate(errp, local_err);
2993 }
2994 out:
2995 aio_context_release(aio_context);
2996 }
2997
2998 void qmp_drive_mirror(const char *device, const char *target,
2999 bool has_format, const char *format,
3000 bool has_node_name, const char *node_name,
3001 bool has_replaces, const char *replaces,
3002 enum MirrorSyncMode sync,
3003 bool has_mode, enum NewImageMode mode,
3004 bool has_speed, int64_t speed,
3005 bool has_granularity, uint32_t granularity,
3006 bool has_buf_size, int64_t buf_size,
3007 bool has_on_source_error, BlockdevOnError on_source_error,
3008 bool has_on_target_error, BlockdevOnError on_target_error,
3009 bool has_unmap, bool unmap,
3010 Error **errp)
3011 {
3012 BlockBackend *blk;
3013 BlockDriverState *bs;
3014 BlockDriverState *source, *target_bs;
3015 AioContext *aio_context;
3016 Error *local_err = NULL;
3017 QDict *options;
3018 int flags;
3019 int64_t size;
3020 int ret;
3021
3022 if (!has_speed) {
3023 speed = 0;
3024 }
3025 if (!has_on_source_error) {
3026 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3027 }
3028 if (!has_on_target_error) {
3029 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3030 }
3031 if (!has_mode) {
3032 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3033 }
3034 if (!has_granularity) {
3035 granularity = 0;
3036 }
3037 if (!has_buf_size) {
3038 buf_size = 0;
3039 }
3040 if (!has_unmap) {
3041 unmap = true;
3042 }
3043
3044 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3045 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3046 "a value in range [512B, 64MB]");
3047 return;
3048 }
3049 if (granularity & (granularity - 1)) {
3050 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3051 "power of 2");
3052 return;
3053 }
3054
3055 blk = blk_by_name(device);
3056 if (!blk) {
3057 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3058 "Device '%s' not found", device);
3059 return;
3060 }
3061
3062 aio_context = blk_get_aio_context(blk);
3063 aio_context_acquire(aio_context);
3064
3065 if (!blk_is_available(blk)) {
3066 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3067 goto out;
3068 }
3069 bs = blk_bs(blk);
3070
3071 if (!has_format) {
3072 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3073 }
3074
3075 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
3076 goto out;
3077 }
3078
3079 flags = bs->open_flags | BDRV_O_RDWR;
3080 source = backing_bs(bs);
3081 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3082 sync = MIRROR_SYNC_MODE_FULL;
3083 }
3084 if (sync == MIRROR_SYNC_MODE_NONE) {
3085 source = bs;
3086 }
3087
3088 size = bdrv_getlength(bs);
3089 if (size < 0) {
3090 error_setg_errno(errp, -size, "bdrv_getlength failed");
3091 goto out;
3092 }
3093
3094 if (has_replaces) {
3095 BlockDriverState *to_replace_bs;
3096 AioContext *replace_aio_context;
3097 int64_t replace_size;
3098
3099 if (!has_node_name) {
3100 error_setg(errp, "a node-name must be provided when replacing a"
3101 " named node of the graph");
3102 goto out;
3103 }
3104
3105 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3106
3107 if (!to_replace_bs) {
3108 error_propagate(errp, local_err);
3109 goto out;
3110 }
3111
3112 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3113 aio_context_acquire(replace_aio_context);
3114 replace_size = bdrv_getlength(to_replace_bs);
3115 aio_context_release(replace_aio_context);
3116
3117 if (size != replace_size) {
3118 error_setg(errp, "cannot replace image with a mirror image of "
3119 "different size");
3120 goto out;
3121 }
3122 }
3123
3124 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3125 && mode != NEW_IMAGE_MODE_EXISTING)
3126 {
3127 /* create new image w/o backing file */
3128 assert(format);
3129 bdrv_img_create(target, format,
3130 NULL, NULL, NULL, size, flags, &local_err, false);
3131 } else {
3132 switch (mode) {
3133 case NEW_IMAGE_MODE_EXISTING:
3134 break;
3135 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3136 /* create new image with backing file */
3137 bdrv_img_create(target, format,
3138 source->filename,
3139 source->drv->format_name,
3140 NULL, size, flags, &local_err, false);
3141 break;
3142 default:
3143 abort();
3144 }
3145 }
3146
3147 if (local_err) {
3148 error_propagate(errp, local_err);
3149 goto out;
3150 }
3151
3152 options = qdict_new();
3153 if (has_node_name) {
3154 qdict_put(options, "node-name", qstring_from_str(node_name));
3155 }
3156 if (format) {
3157 qdict_put(options, "driver", qstring_from_str(format));
3158 }
3159
3160 /* Mirroring takes care of copy-on-write using the source's backing
3161 * file.
3162 */
3163 target_bs = NULL;
3164 ret = bdrv_open(&target_bs, target, NULL, options,
3165 flags | BDRV_O_NO_BACKING, &local_err);
3166 if (ret < 0) {
3167 error_propagate(errp, local_err);
3168 goto out;
3169 }
3170
3171 bdrv_set_aio_context(target_bs, aio_context);
3172
3173 /* pass the node name to replace to mirror start since it's loose coupling
3174 * and will allow to check whether the node still exist at mirror completion
3175 */
3176 mirror_start(bs, target_bs,
3177 has_replaces ? replaces : NULL,
3178 speed, granularity, buf_size, sync,
3179 on_source_error, on_target_error,
3180 unmap,
3181 block_job_cb, bs, &local_err);
3182 if (local_err != NULL) {
3183 bdrv_unref(target_bs);
3184 error_propagate(errp, local_err);
3185 goto out;
3186 }
3187
3188 out:
3189 aio_context_release(aio_context);
3190 }
3191
3192 /* Get the block job for a given device name and acquire its AioContext */
3193 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3194 Error **errp)
3195 {
3196 BlockBackend *blk;
3197 BlockDriverState *bs;
3198
3199 *aio_context = NULL;
3200
3201 blk = blk_by_name(device);
3202 if (!blk) {
3203 goto notfound;
3204 }
3205
3206 *aio_context = blk_get_aio_context(blk);
3207 aio_context_acquire(*aio_context);
3208
3209 if (!blk_is_available(blk)) {
3210 goto notfound;
3211 }
3212 bs = blk_bs(blk);
3213
3214 if (!bs->job) {
3215 goto notfound;
3216 }
3217
3218 return bs->job;
3219
3220 notfound:
3221 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3222 "No active block job on device '%s'", device);
3223 if (*aio_context) {
3224 aio_context_release(*aio_context);
3225 *aio_context = NULL;
3226 }
3227 return NULL;
3228 }
3229
3230 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3231 {
3232 AioContext *aio_context;
3233 BlockJob *job = find_block_job(device, &aio_context, errp);
3234
3235 if (!job) {
3236 return;
3237 }
3238
3239 block_job_set_speed(job, speed, errp);
3240 aio_context_release(aio_context);
3241 }
3242
3243 void qmp_block_job_cancel(const char *device,
3244 bool has_force, bool force, Error **errp)
3245 {
3246 AioContext *aio_context;
3247 BlockJob *job = find_block_job(device, &aio_context, errp);
3248
3249 if (!job) {
3250 return;
3251 }
3252
3253 if (!has_force) {
3254 force = false;
3255 }
3256
3257 if (job->user_paused && !force) {
3258 error_setg(errp, "The block job for device '%s' is currently paused",
3259 device);
3260 goto out;
3261 }
3262
3263 trace_qmp_block_job_cancel(job);
3264 block_job_cancel(job);
3265 out:
3266 aio_context_release(aio_context);
3267 }
3268
3269 void qmp_block_job_pause(const char *device, Error **errp)
3270 {
3271 AioContext *aio_context;
3272 BlockJob *job = find_block_job(device, &aio_context, errp);
3273
3274 if (!job || job->user_paused) {
3275 return;
3276 }
3277
3278 job->user_paused = true;
3279 trace_qmp_block_job_pause(job);
3280 block_job_pause(job);
3281 aio_context_release(aio_context);
3282 }
3283
3284 void qmp_block_job_resume(const char *device, Error **errp)
3285 {
3286 AioContext *aio_context;
3287 BlockJob *job = find_block_job(device, &aio_context, errp);
3288
3289 if (!job || !job->user_paused) {
3290 return;
3291 }
3292
3293 job->user_paused = false;
3294 trace_qmp_block_job_resume(job);
3295 block_job_resume(job);
3296 aio_context_release(aio_context);
3297 }
3298
3299 void qmp_block_job_complete(const char *device, Error **errp)
3300 {
3301 AioContext *aio_context;
3302 BlockJob *job = find_block_job(device, &aio_context, errp);
3303
3304 if (!job) {
3305 return;
3306 }
3307
3308 trace_qmp_block_job_complete(job);
3309 block_job_complete(job, errp);
3310 aio_context_release(aio_context);
3311 }
3312
3313 void qmp_change_backing_file(const char *device,
3314 const char *image_node_name,
3315 const char *backing_file,
3316 Error **errp)
3317 {
3318 BlockBackend *blk;
3319 BlockDriverState *bs = NULL;
3320 AioContext *aio_context;
3321 BlockDriverState *image_bs = NULL;
3322 Error *local_err = NULL;
3323 bool ro;
3324 int open_flags;
3325 int ret;
3326
3327 blk = blk_by_name(device);
3328 if (!blk) {
3329 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3330 "Device '%s' not found", device);
3331 return;
3332 }
3333
3334 aio_context = blk_get_aio_context(blk);
3335 aio_context_acquire(aio_context);
3336
3337 if (!blk_is_available(blk)) {
3338 error_setg(errp, "Device '%s' has no medium", device);
3339 goto out;
3340 }
3341 bs = blk_bs(blk);
3342
3343 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3344 if (local_err) {
3345 error_propagate(errp, local_err);
3346 goto out;
3347 }
3348
3349 if (!image_bs) {
3350 error_setg(errp, "image file not found");
3351 goto out;
3352 }
3353
3354 if (bdrv_find_base(image_bs) == image_bs) {
3355 error_setg(errp, "not allowing backing file change on an image "
3356 "without a backing file");
3357 goto out;
3358 }
3359
3360 /* even though we are not necessarily operating on bs, we need it to
3361 * determine if block ops are currently prohibited on the chain */
3362 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3363 goto out;
3364 }
3365
3366 /* final sanity check */
3367 if (!bdrv_chain_contains(bs, image_bs)) {
3368 error_setg(errp, "'%s' and image file are not in the same chain",
3369 device);
3370 goto out;
3371 }
3372
3373 /* if not r/w, reopen to make r/w */
3374 open_flags = image_bs->open_flags;
3375 ro = bdrv_is_read_only(image_bs);
3376
3377 if (ro) {
3378 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3379 if (local_err) {
3380 error_propagate(errp, local_err);
3381 goto out;
3382 }
3383 }
3384
3385 ret = bdrv_change_backing_file(image_bs, backing_file,
3386 image_bs->drv ? image_bs->drv->format_name : "");
3387
3388 if (ret < 0) {
3389 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3390 backing_file);
3391 /* don't exit here, so we can try to restore open flags if
3392 * appropriate */
3393 }
3394
3395 if (ro) {
3396 bdrv_reopen(image_bs, open_flags, &local_err);
3397 if (local_err) {
3398 error_propagate(errp, local_err); /* will preserve prior errp */
3399 }
3400 }
3401
3402 out:
3403 aio_context_release(aio_context);
3404 }
3405
3406 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3407 {
3408 QmpOutputVisitor *ov = qmp_output_visitor_new();
3409 BlockDriverState *bs;
3410 BlockBackend *blk = NULL;
3411 QObject *obj;
3412 QDict *qdict;
3413 Error *local_err = NULL;
3414
3415 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3416 * cache.direct=false instead of silently switching to aio=threads, except
3417 * when called from drive_new().
3418 *
3419 * For now, simply forbidding the combination for all drivers will do. */
3420 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3421 bool direct = options->has_cache &&
3422 options->cache->has_direct &&
3423 options->cache->direct;
3424 if (!direct) {
3425 error_setg(errp, "aio=native requires cache.direct=true");
3426 goto fail;
3427 }
3428 }
3429
3430 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3431 &options, NULL, &local_err);
3432 if (local_err) {
3433 error_propagate(errp, local_err);
3434 goto fail;
3435 }
3436
3437 obj = qmp_output_get_qobject(ov);
3438 qdict = qobject_to_qdict(obj);
3439
3440 qdict_flatten(qdict);
3441
3442 if (options->has_id) {
3443 blk = blockdev_init(NULL, qdict, &local_err);
3444 if (local_err) {
3445 error_propagate(errp, local_err);
3446 goto fail;
3447 }
3448
3449 bs = blk_bs(blk);
3450 } else {
3451 if (!qdict_get_try_str(qdict, "node-name")) {
3452 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3453 "the root node");
3454 goto fail;
3455 }
3456
3457 bs = bds_tree_init(qdict, errp);
3458 if (!bs) {
3459 goto fail;
3460 }
3461 }
3462
3463 if (bs && bdrv_key_required(bs)) {
3464 if (blk) {
3465 blk_unref(blk);
3466 } else {
3467 bdrv_unref(bs);
3468 }
3469 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3470 goto fail;
3471 }
3472
3473 fail:
3474 qmp_output_visitor_cleanup(ov);
3475 }
3476
3477 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3478 {
3479 BlockJobInfoList *head = NULL, **p_next = &head;
3480 BlockDriverState *bs;
3481
3482 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3483 AioContext *aio_context = bdrv_get_aio_context(bs);
3484
3485 aio_context_acquire(aio_context);
3486
3487 if (bs->job) {
3488 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3489 elem->value = block_job_query(bs->job);
3490 *p_next = elem;
3491 p_next = &elem->next;
3492 }
3493
3494 aio_context_release(aio_context);
3495 }
3496
3497 return head;
3498 }
3499
3500 QemuOptsList qemu_common_drive_opts = {
3501 .name = "drive",
3502 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3503 .desc = {
3504 {
3505 .name = "snapshot",
3506 .type = QEMU_OPT_BOOL,
3507 .help = "enable/disable snapshot mode",
3508 },{
3509 .name = "discard",
3510 .type = QEMU_OPT_STRING,
3511 .help = "discard operation (ignore/off, unmap/on)",
3512 },{
3513 .name = BDRV_OPT_CACHE_WB,
3514 .type = QEMU_OPT_BOOL,
3515 .help = "enables writeback mode for any caches",
3516 },{
3517 .name = BDRV_OPT_CACHE_DIRECT,
3518 .type = QEMU_OPT_BOOL,
3519 .help = "enables use of O_DIRECT (bypass the host page cache)",
3520 },{
3521 .name = BDRV_OPT_CACHE_NO_FLUSH,
3522 .type = QEMU_OPT_BOOL,
3523 .help = "ignore any flush requests for the device",
3524 },{
3525 .name = "aio",
3526 .type = QEMU_OPT_STRING,
3527 .help = "host AIO implementation (threads, native)",
3528 },{
3529 .name = "format",
3530 .type = QEMU_OPT_STRING,
3531 .help = "disk format (raw, qcow2, ...)",
3532 },{
3533 .name = "rerror",
3534 .type = QEMU_OPT_STRING,
3535 .help = "read error action",
3536 },{
3537 .name = "werror",
3538 .type = QEMU_OPT_STRING,
3539 .help = "write error action",
3540 },{
3541 .name = "read-only",
3542 .type = QEMU_OPT_BOOL,
3543 .help = "open drive file as read-only",
3544 },{
3545 .name = "throttling.iops-total",
3546 .type = QEMU_OPT_NUMBER,
3547 .help = "limit total I/O operations per second",
3548 },{
3549 .name = "throttling.iops-read",
3550 .type = QEMU_OPT_NUMBER,
3551 .help = "limit read operations per second",
3552 },{
3553 .name = "throttling.iops-write",
3554 .type = QEMU_OPT_NUMBER,
3555 .help = "limit write operations per second",
3556 },{
3557 .name = "throttling.bps-total",
3558 .type = QEMU_OPT_NUMBER,
3559 .help = "limit total bytes per second",
3560 },{
3561 .name = "throttling.bps-read",
3562 .type = QEMU_OPT_NUMBER,
3563 .help = "limit read bytes per second",
3564 },{
3565 .name = "throttling.bps-write",
3566 .type = QEMU_OPT_NUMBER,
3567 .help = "limit write bytes per second",
3568 },{
3569 .name = "throttling.iops-total-max",
3570 .type = QEMU_OPT_NUMBER,
3571 .help = "I/O operations burst",
3572 },{
3573 .name = "throttling.iops-read-max",
3574 .type = QEMU_OPT_NUMBER,
3575 .help = "I/O operations read burst",
3576 },{
3577 .name = "throttling.iops-write-max",
3578 .type = QEMU_OPT_NUMBER,
3579 .help = "I/O operations write burst",
3580 },{
3581 .name = "throttling.bps-total-max",
3582 .type = QEMU_OPT_NUMBER,
3583 .help = "total bytes burst",
3584 },{
3585 .name = "throttling.bps-read-max",
3586 .type = QEMU_OPT_NUMBER,
3587 .help = "total bytes read burst",
3588 },{
3589 .name = "throttling.bps-write-max",
3590 .type = QEMU_OPT_NUMBER,
3591 .help = "total bytes write burst",
3592 },{
3593 .name = "throttling.iops-size",
3594 .type = QEMU_OPT_NUMBER,
3595 .help = "when limiting by iops max size of an I/O in bytes",
3596 },{
3597 .name = "throttling.group",
3598 .type = QEMU_OPT_STRING,
3599 .help = "name of the block throttling group",
3600 },{
3601 .name = "copy-on-read",
3602 .type = QEMU_OPT_BOOL,
3603 .help = "copy read data from backing file into image file",
3604 },{
3605 .name = "detect-zeroes",
3606 .type = QEMU_OPT_STRING,
3607 .help = "try to optimize zero writes (off, on, unmap)",
3608 },
3609 { /* end of list */ }
3610 },
3611 };
3612
3613 static QemuOptsList qemu_root_bds_opts = {
3614 .name = "root-bds",
3615 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3616 .desc = {
3617 {
3618 .name = "discard",
3619 .type = QEMU_OPT_STRING,
3620 .help = "discard operation (ignore/off, unmap/on)",
3621 },{
3622 .name = "cache.writeback",
3623 .type = QEMU_OPT_BOOL,
3624 .help = "enables writeback mode for any caches",
3625 },{
3626 .name = "cache.direct",
3627 .type = QEMU_OPT_BOOL,
3628 .help = "enables use of O_DIRECT (bypass the host page cache)",
3629 },{
3630 .name = "cache.no-flush",
3631 .type = QEMU_OPT_BOOL,
3632 .help = "ignore any flush requests for the device",
3633 },{
3634 .name = "aio",
3635 .type = QEMU_OPT_STRING,
3636 .help = "host AIO implementation (threads, native)",
3637 },{
3638 .name = "read-only",
3639 .type = QEMU_OPT_BOOL,
3640 .help = "open drive file as read-only",
3641 },{
3642 .name = "copy-on-read",
3643 .type = QEMU_OPT_BOOL,
3644 .help = "copy read data from backing file into image file",
3645 },{
3646 .name = "detect-zeroes",
3647 .type = QEMU_OPT_STRING,
3648 .help = "try to optimize zero writes (off, on, unmap)",
3649 },
3650 { /* end of list */ }
3651 },
3652 };
3653
3654 QemuOptsList qemu_drive_opts = {
3655 .name = "drive",
3656 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3657 .desc = {
3658 /*
3659 * no elements => accept any params
3660 * validation will happen later
3661 */
3662 { /* end of list */ }
3663 },
3664 };
QEmu