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aio: Add "is_external" flag for event handlers
[qemu.git] / blockdev.c
blob35e571980f38d50156ceee6da5ac7946e09955e1
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 blk = blk_by_name(device);
1124 if (!blk) {
1125 monitor_printf(mon, "Device '%s' not found\n", device);
1126 return;
1127 }
1128 if (!blk_is_available(blk)) {
1129 monitor_printf(mon, "Device '%s' has no medium\n", device);
1130 return;
1131 }
1132 ret = bdrv_commit(blk_bs(blk));
1133 }
1134 if (ret < 0) {
1135 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1136 strerror(-ret));
1137 }
1138 }
1139
1140 static void blockdev_do_action(int kind, void *data, Error **errp)
1141 {
1142 TransactionAction action;
1143 TransactionActionList list;
1144
1145 action.kind = kind;
1146 action.data = data;
1147 list.value = &action;
1148 list.next = NULL;
1149 qmp_transaction(&list, errp);
1150 }
1151
1152 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1153 bool has_node_name, const char *node_name,
1154 const char *snapshot_file,
1155 bool has_snapshot_node_name,
1156 const char *snapshot_node_name,
1157 bool has_format, const char *format,
1158 bool has_mode, NewImageMode mode, Error **errp)
1159 {
1160 BlockdevSnapshot snapshot = {
1161 .has_device = has_device,
1162 .device = (char *) device,
1163 .has_node_name = has_node_name,
1164 .node_name = (char *) node_name,
1165 .snapshot_file = (char *) snapshot_file,
1166 .has_snapshot_node_name = has_snapshot_node_name,
1167 .snapshot_node_name = (char *) snapshot_node_name,
1168 .has_format = has_format,
1169 .format = (char *) format,
1170 .has_mode = has_mode,
1171 .mode = mode,
1172 };
1173 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1174 &snapshot, errp);
1175 }
1176
1177 void qmp_blockdev_snapshot_internal_sync(const char *device,
1178 const char *name,
1179 Error **errp)
1180 {
1181 BlockdevSnapshotInternal snapshot = {
1182 .device = (char *) device,
1183 .name = (char *) name
1184 };
1185
1186 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1187 &snapshot, errp);
1188 }
1189
1190 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1191 bool has_id,
1192 const char *id,
1193 bool has_name,
1194 const char *name,
1195 Error **errp)
1196 {
1197 BlockDriverState *bs;
1198 BlockBackend *blk;
1199 AioContext *aio_context;
1200 QEMUSnapshotInfo sn;
1201 Error *local_err = NULL;
1202 SnapshotInfo *info = NULL;
1203 int ret;
1204
1205 blk = blk_by_name(device);
1206 if (!blk) {
1207 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1208 "Device '%s' not found", device);
1209 return NULL;
1210 }
1211
1212 aio_context = blk_get_aio_context(blk);
1213 aio_context_acquire(aio_context);
1214
1215 if (!has_id) {
1216 id = NULL;
1217 }
1218
1219 if (!has_name) {
1220 name = NULL;
1221 }
1222
1223 if (!id && !name) {
1224 error_setg(errp, "Name or id must be provided");
1225 goto out_aio_context;
1226 }
1227
1228 if (!blk_is_available(blk)) {
1229 error_setg(errp, "Device '%s' has no medium", device);
1230 goto out_aio_context;
1231 }
1232 bs = blk_bs(blk);
1233
1234 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1235 goto out_aio_context;
1236 }
1237
1238 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1239 if (local_err) {
1240 error_propagate(errp, local_err);
1241 goto out_aio_context;
1242 }
1243 if (!ret) {
1244 error_setg(errp,
1245 "Snapshot with id '%s' and name '%s' does not exist on "
1246 "device '%s'",
1247 STR_OR_NULL(id), STR_OR_NULL(name), device);
1248 goto out_aio_context;
1249 }
1250
1251 bdrv_snapshot_delete(bs, id, name, &local_err);
1252 if (local_err) {
1253 error_propagate(errp, local_err);
1254 goto out_aio_context;
1255 }
1256
1257 aio_context_release(aio_context);
1258
1259 info = g_new0(SnapshotInfo, 1);
1260 info->id = g_strdup(sn.id_str);
1261 info->name = g_strdup(sn.name);
1262 info->date_nsec = sn.date_nsec;
1263 info->date_sec = sn.date_sec;
1264 info->vm_state_size = sn.vm_state_size;
1265 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1266 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1267
1268 return info;
1269
1270 out_aio_context:
1271 aio_context_release(aio_context);
1272 return NULL;
1273 }
1274
1275 /**
1276 * block_dirty_bitmap_lookup:
1277 * Return a dirty bitmap (if present), after validating
1278 * the node reference and bitmap names.
1279 *
1280 * @node: The name of the BDS node to search for bitmaps
1281 * @name: The name of the bitmap to search for
1282 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1283 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1284 * @errp: Output pointer for error information. Can be NULL.
1285 *
1286 * @return: A bitmap object on success, or NULL on failure.
1287 */
1288 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1289 const char *name,
1290 BlockDriverState **pbs,
1291 AioContext **paio,
1292 Error **errp)
1293 {
1294 BlockDriverState *bs;
1295 BdrvDirtyBitmap *bitmap;
1296 AioContext *aio_context;
1297
1298 if (!node) {
1299 error_setg(errp, "Node cannot be NULL");
1300 return NULL;
1301 }
1302 if (!name) {
1303 error_setg(errp, "Bitmap name cannot be NULL");
1304 return NULL;
1305 }
1306 bs = bdrv_lookup_bs(node, node, NULL);
1307 if (!bs) {
1308 error_setg(errp, "Node '%s' not found", node);
1309 return NULL;
1310 }
1311
1312 aio_context = bdrv_get_aio_context(bs);
1313 aio_context_acquire(aio_context);
1314
1315 bitmap = bdrv_find_dirty_bitmap(bs, name);
1316 if (!bitmap) {
1317 error_setg(errp, "Dirty bitmap '%s' not found", name);
1318 goto fail;
1319 }
1320
1321 if (pbs) {
1322 *pbs = bs;
1323 }
1324 if (paio) {
1325 *paio = aio_context;
1326 } else {
1327 aio_context_release(aio_context);
1328 }
1329
1330 return bitmap;
1331
1332 fail:
1333 aio_context_release(aio_context);
1334 return NULL;
1335 }
1336
1337 /* New and old BlockDriverState structs for atomic group operations */
1338
1339 typedef struct BlkTransactionState BlkTransactionState;
1340
1341 /* Only prepare() may fail. In a single transaction, only one of commit() or
1342 abort() will be called, clean() will always be called if it present. */
1343 typedef struct BdrvActionOps {
1344 /* Size of state struct, in bytes. */
1345 size_t instance_size;
1346 /* Prepare the work, must NOT be NULL. */
1347 void (*prepare)(BlkTransactionState *common, Error **errp);
1348 /* Commit the changes, can be NULL. */
1349 void (*commit)(BlkTransactionState *common);
1350 /* Abort the changes on fail, can be NULL. */
1351 void (*abort)(BlkTransactionState *common);
1352 /* Clean up resource in the end, can be NULL. */
1353 void (*clean)(BlkTransactionState *common);
1354 } BdrvActionOps;
1355
1356 /*
1357 * This structure must be arranged as first member in child type, assuming
1358 * that compiler will also arrange it to the same address with parent instance.
1359 * Later it will be used in free().
1360 */
1361 struct BlkTransactionState {
1362 TransactionAction *action;
1363 const BdrvActionOps *ops;
1364 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1365 };
1366
1367 /* internal snapshot private data */
1368 typedef struct InternalSnapshotState {
1369 BlkTransactionState common;
1370 BlockDriverState *bs;
1371 AioContext *aio_context;
1372 QEMUSnapshotInfo sn;
1373 } InternalSnapshotState;
1374
1375 static void internal_snapshot_prepare(BlkTransactionState *common,
1376 Error **errp)
1377 {
1378 Error *local_err = NULL;
1379 const char *device;
1380 const char *name;
1381 BlockBackend *blk;
1382 BlockDriverState *bs;
1383 QEMUSnapshotInfo old_sn, *sn;
1384 bool ret;
1385 qemu_timeval tv;
1386 BlockdevSnapshotInternal *internal;
1387 InternalSnapshotState *state;
1388 int ret1;
1389
1390 g_assert(common->action->kind ==
1391 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1392 internal = common->action->blockdev_snapshot_internal_sync;
1393 state = DO_UPCAST(InternalSnapshotState, common, common);
1394
1395 /* 1. parse input */
1396 device = internal->device;
1397 name = internal->name;
1398
1399 /* 2. check for validation */
1400 blk = blk_by_name(device);
1401 if (!blk) {
1402 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1403 "Device '%s' not found", device);
1404 return;
1405 }
1406
1407 /* AioContext is released in .clean() */
1408 state->aio_context = blk_get_aio_context(blk);
1409 aio_context_acquire(state->aio_context);
1410
1411 if (!blk_is_available(blk)) {
1412 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1413 return;
1414 }
1415 bs = blk_bs(blk);
1416
1417 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1418 return;
1419 }
1420
1421 if (bdrv_is_read_only(bs)) {
1422 error_setg(errp, "Device '%s' is read only", device);
1423 return;
1424 }
1425
1426 if (!bdrv_can_snapshot(bs)) {
1427 error_setg(errp, "Block format '%s' used by device '%s' "
1428 "does not support internal snapshots",
1429 bs->drv->format_name, device);
1430 return;
1431 }
1432
1433 if (!strlen(name)) {
1434 error_setg(errp, "Name is empty");
1435 return;
1436 }
1437
1438 /* check whether a snapshot with name exist */
1439 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1440 &local_err);
1441 if (local_err) {
1442 error_propagate(errp, local_err);
1443 return;
1444 } else if (ret) {
1445 error_setg(errp,
1446 "Snapshot with name '%s' already exists on device '%s'",
1447 name, device);
1448 return;
1449 }
1450
1451 /* 3. take the snapshot */
1452 sn = &state->sn;
1453 pstrcpy(sn->name, sizeof(sn->name), name);
1454 qemu_gettimeofday(&tv);
1455 sn->date_sec = tv.tv_sec;
1456 sn->date_nsec = tv.tv_usec * 1000;
1457 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1458
1459 ret1 = bdrv_snapshot_create(bs, sn);
1460 if (ret1 < 0) {
1461 error_setg_errno(errp, -ret1,
1462 "Failed to create snapshot '%s' on device '%s'",
1463 name, device);
1464 return;
1465 }
1466
1467 /* 4. succeed, mark a snapshot is created */
1468 state->bs = bs;
1469 }
1470
1471 static void internal_snapshot_abort(BlkTransactionState *common)
1472 {
1473 InternalSnapshotState *state =
1474 DO_UPCAST(InternalSnapshotState, common, common);
1475 BlockDriverState *bs = state->bs;
1476 QEMUSnapshotInfo *sn = &state->sn;
1477 Error *local_error = NULL;
1478
1479 if (!bs) {
1480 return;
1481 }
1482
1483 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1484 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1485 "device '%s' in abort: %s",
1486 sn->id_str,
1487 sn->name,
1488 bdrv_get_device_name(bs),
1489 error_get_pretty(local_error));
1490 error_free(local_error);
1491 }
1492 }
1493
1494 static void internal_snapshot_clean(BlkTransactionState *common)
1495 {
1496 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1497 common, common);
1498
1499 if (state->aio_context) {
1500 aio_context_release(state->aio_context);
1501 }
1502 }
1503
1504 /* external snapshot private data */
1505 typedef struct ExternalSnapshotState {
1506 BlkTransactionState common;
1507 BlockDriverState *old_bs;
1508 BlockDriverState *new_bs;
1509 AioContext *aio_context;
1510 } ExternalSnapshotState;
1511
1512 static void external_snapshot_prepare(BlkTransactionState *common,
1513 Error **errp)
1514 {
1515 int flags, ret;
1516 QDict *options;
1517 Error *local_err = NULL;
1518 bool has_device = false;
1519 const char *device;
1520 bool has_node_name = false;
1521 const char *node_name;
1522 bool has_snapshot_node_name = false;
1523 const char *snapshot_node_name;
1524 const char *new_image_file;
1525 const char *format = "qcow2";
1526 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1527 ExternalSnapshotState *state =
1528 DO_UPCAST(ExternalSnapshotState, common, common);
1529 TransactionAction *action = common->action;
1530
1531 /* get parameters */
1532 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1533
1534 has_device = action->blockdev_snapshot_sync->has_device;
1535 device = action->blockdev_snapshot_sync->device;
1536 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1537 node_name = action->blockdev_snapshot_sync->node_name;
1538 has_snapshot_node_name =
1539 action->blockdev_snapshot_sync->has_snapshot_node_name;
1540 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1541
1542 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1543 if (action->blockdev_snapshot_sync->has_format) {
1544 format = action->blockdev_snapshot_sync->format;
1545 }
1546 if (action->blockdev_snapshot_sync->has_mode) {
1547 mode = action->blockdev_snapshot_sync->mode;
1548 }
1549
1550 /* start processing */
1551 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1552 has_node_name ? node_name : NULL,
1553 &local_err);
1554 if (local_err) {
1555 error_propagate(errp, local_err);
1556 return;
1557 }
1558
1559 if (has_node_name && !has_snapshot_node_name) {
1560 error_setg(errp, "New snapshot node name missing");
1561 return;
1562 }
1563
1564 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1565 error_setg(errp, "New snapshot node name already existing");
1566 return;
1567 }
1568
1569 /* Acquire AioContext now so any threads operating on old_bs stop */
1570 state->aio_context = bdrv_get_aio_context(state->old_bs);
1571 aio_context_acquire(state->aio_context);
1572
1573 if (!bdrv_is_inserted(state->old_bs)) {
1574 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1575 return;
1576 }
1577
1578 if (bdrv_op_is_blocked(state->old_bs,
1579 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1580 return;
1581 }
1582
1583 if (!bdrv_is_read_only(state->old_bs)) {
1584 if (bdrv_flush(state->old_bs)) {
1585 error_setg(errp, QERR_IO_ERROR);
1586 return;
1587 }
1588 }
1589
1590 if (!bdrv_is_first_non_filter(state->old_bs)) {
1591 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1592 return;
1593 }
1594
1595 flags = state->old_bs->open_flags;
1596
1597 /* create new image w/backing file */
1598 if (mode != NEW_IMAGE_MODE_EXISTING) {
1599 bdrv_img_create(new_image_file, format,
1600 state->old_bs->filename,
1601 state->old_bs->drv->format_name,
1602 NULL, -1, flags, &local_err, false);
1603 if (local_err) {
1604 error_propagate(errp, local_err);
1605 return;
1606 }
1607 }
1608
1609 options = qdict_new();
1610 if (has_snapshot_node_name) {
1611 qdict_put(options, "node-name",
1612 qstring_from_str(snapshot_node_name));
1613 }
1614 qdict_put(options, "driver", qstring_from_str(format));
1615
1616 /* TODO Inherit bs->options or only take explicit options with an
1617 * extended QMP command? */
1618 assert(state->new_bs == NULL);
1619 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1620 flags | BDRV_O_NO_BACKING, &local_err);
1621 /* We will manually add the backing_hd field to the bs later */
1622 if (ret != 0) {
1623 error_propagate(errp, local_err);
1624 }
1625 }
1626
1627 static void external_snapshot_commit(BlkTransactionState *common)
1628 {
1629 ExternalSnapshotState *state =
1630 DO_UPCAST(ExternalSnapshotState, common, common);
1631
1632 bdrv_set_aio_context(state->new_bs, state->aio_context);
1633
1634 /* This removes our old bs and adds the new bs */
1635 bdrv_append(state->new_bs, state->old_bs);
1636 /* We don't need (or want) to use the transactional
1637 * bdrv_reopen_multiple() across all the entries at once, because we
1638 * don't want to abort all of them if one of them fails the reopen */
1639 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1640 NULL);
1641
1642 aio_context_release(state->aio_context);
1643 }
1644
1645 static void external_snapshot_abort(BlkTransactionState *common)
1646 {
1647 ExternalSnapshotState *state =
1648 DO_UPCAST(ExternalSnapshotState, common, common);
1649 if (state->new_bs) {
1650 bdrv_unref(state->new_bs);
1651 }
1652 if (state->aio_context) {
1653 aio_context_release(state->aio_context);
1654 }
1655 }
1656
1657 typedef struct DriveBackupState {
1658 BlkTransactionState common;
1659 BlockDriverState *bs;
1660 AioContext *aio_context;
1661 BlockJob *job;
1662 } DriveBackupState;
1663
1664 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1665 {
1666 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1667 BlockBackend *blk;
1668 DriveBackup *backup;
1669 Error *local_err = NULL;
1670
1671 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1672 backup = common->action->drive_backup;
1673
1674 blk = blk_by_name(backup->device);
1675 if (!blk) {
1676 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1677 "Device '%s' not found", backup->device);
1678 return;
1679 }
1680
1681 /* AioContext is released in .clean() */
1682 state->aio_context = blk_get_aio_context(blk);
1683 aio_context_acquire(state->aio_context);
1684
1685 qmp_drive_backup(backup->device, backup->target,
1686 backup->has_format, backup->format,
1687 backup->sync,
1688 backup->has_mode, backup->mode,
1689 backup->has_speed, backup->speed,
1690 backup->has_bitmap, backup->bitmap,
1691 backup->has_on_source_error, backup->on_source_error,
1692 backup->has_on_target_error, backup->on_target_error,
1693 &local_err);
1694 if (local_err) {
1695 error_propagate(errp, local_err);
1696 return;
1697 }
1698
1699 state->bs = blk_bs(blk);
1700 state->job = state->bs->job;
1701 }
1702
1703 static void drive_backup_abort(BlkTransactionState *common)
1704 {
1705 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1706 BlockDriverState *bs = state->bs;
1707
1708 /* Only cancel if it's the job we started */
1709 if (bs && bs->job && bs->job == state->job) {
1710 block_job_cancel_sync(bs->job);
1711 }
1712 }
1713
1714 static void drive_backup_clean(BlkTransactionState *common)
1715 {
1716 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1717
1718 if (state->aio_context) {
1719 aio_context_release(state->aio_context);
1720 }
1721 }
1722
1723 typedef struct BlockdevBackupState {
1724 BlkTransactionState common;
1725 BlockDriverState *bs;
1726 BlockJob *job;
1727 AioContext *aio_context;
1728 } BlockdevBackupState;
1729
1730 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
1731 {
1732 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1733 BlockdevBackup *backup;
1734 BlockBackend *blk, *target;
1735 Error *local_err = NULL;
1736
1737 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1738 backup = common->action->blockdev_backup;
1739
1740 blk = blk_by_name(backup->device);
1741 if (!blk) {
1742 error_setg(errp, "Device '%s' not found", backup->device);
1743 return;
1744 }
1745
1746 target = blk_by_name(backup->target);
1747 if (!target) {
1748 error_setg(errp, "Device '%s' not found", backup->target);
1749 return;
1750 }
1751
1752 /* AioContext is released in .clean() */
1753 state->aio_context = blk_get_aio_context(blk);
1754 if (state->aio_context != blk_get_aio_context(target)) {
1755 state->aio_context = NULL;
1756 error_setg(errp, "Backup between two IO threads is not implemented");
1757 return;
1758 }
1759 aio_context_acquire(state->aio_context);
1760
1761 qmp_blockdev_backup(backup->device, backup->target,
1762 backup->sync,
1763 backup->has_speed, backup->speed,
1764 backup->has_on_source_error, backup->on_source_error,
1765 backup->has_on_target_error, backup->on_target_error,
1766 &local_err);
1767 if (local_err) {
1768 error_propagate(errp, local_err);
1769 return;
1770 }
1771
1772 state->bs = blk_bs(blk);
1773 state->job = state->bs->job;
1774 }
1775
1776 static void blockdev_backup_abort(BlkTransactionState *common)
1777 {
1778 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1779 BlockDriverState *bs = state->bs;
1780
1781 /* Only cancel if it's the job we started */
1782 if (bs && bs->job && bs->job == state->job) {
1783 block_job_cancel_sync(bs->job);
1784 }
1785 }
1786
1787 static void blockdev_backup_clean(BlkTransactionState *common)
1788 {
1789 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1790
1791 if (state->aio_context) {
1792 aio_context_release(state->aio_context);
1793 }
1794 }
1795
1796 static void abort_prepare(BlkTransactionState *common, Error **errp)
1797 {
1798 error_setg(errp, "Transaction aborted using Abort action");
1799 }
1800
1801 static void abort_commit(BlkTransactionState *common)
1802 {
1803 g_assert_not_reached(); /* this action never succeeds */
1804 }
1805
1806 static const BdrvActionOps actions[] = {
1807 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1808 .instance_size = sizeof(ExternalSnapshotState),
1809 .prepare = external_snapshot_prepare,
1810 .commit = external_snapshot_commit,
1811 .abort = external_snapshot_abort,
1812 },
1813 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1814 .instance_size = sizeof(DriveBackupState),
1815 .prepare = drive_backup_prepare,
1816 .abort = drive_backup_abort,
1817 .clean = drive_backup_clean,
1818 },
1819 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
1820 .instance_size = sizeof(BlockdevBackupState),
1821 .prepare = blockdev_backup_prepare,
1822 .abort = blockdev_backup_abort,
1823 .clean = blockdev_backup_clean,
1824 },
1825 [TRANSACTION_ACTION_KIND_ABORT] = {
1826 .instance_size = sizeof(BlkTransactionState),
1827 .prepare = abort_prepare,
1828 .commit = abort_commit,
1829 },
1830 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1831 .instance_size = sizeof(InternalSnapshotState),
1832 .prepare = internal_snapshot_prepare,
1833 .abort = internal_snapshot_abort,
1834 .clean = internal_snapshot_clean,
1835 },
1836 };
1837
1838 /*
1839 * 'Atomic' group operations. The operations are performed as a set, and if
1840 * any fail then we roll back all operations in the group.
1841 */
1842 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1843 {
1844 TransactionActionList *dev_entry = dev_list;
1845 BlkTransactionState *state, *next;
1846 Error *local_err = NULL;
1847
1848 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1849 QSIMPLEQ_INIT(&snap_bdrv_states);
1850
1851 /* drain all i/o before any operations */
1852 bdrv_drain_all();
1853
1854 /* We don't do anything in this loop that commits us to the operations */
1855 while (NULL != dev_entry) {
1856 TransactionAction *dev_info = NULL;
1857 const BdrvActionOps *ops;
1858
1859 dev_info = dev_entry->value;
1860 dev_entry = dev_entry->next;
1861
1862 assert(dev_info->kind < ARRAY_SIZE(actions));
1863
1864 ops = &actions[dev_info->kind];
1865 assert(ops->instance_size > 0);
1866
1867 state = g_malloc0(ops->instance_size);
1868 state->ops = ops;
1869 state->action = dev_info;
1870 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1871
1872 state->ops->prepare(state, &local_err);
1873 if (local_err) {
1874 error_propagate(errp, local_err);
1875 goto delete_and_fail;
1876 }
1877 }
1878
1879 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1880 if (state->ops->commit) {
1881 state->ops->commit(state);
1882 }
1883 }
1884
1885 /* success */
1886 goto exit;
1887
1888 delete_and_fail:
1889 /* failure, and it is all-or-none; roll back all operations */
1890 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1891 if (state->ops->abort) {
1892 state->ops->abort(state);
1893 }
1894 }
1895 exit:
1896 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1897 if (state->ops->clean) {
1898 state->ops->clean(state);
1899 }
1900 g_free(state);
1901 }
1902 }
1903
1904
1905 static void eject_device(BlockBackend *blk, int force, Error **errp)
1906 {
1907 BlockDriverState *bs = blk_bs(blk);
1908 AioContext *aio_context;
1909
1910 if (!bs) {
1911 /* No medium inserted, so there is nothing to do */
1912 return;
1913 }
1914
1915 aio_context = bdrv_get_aio_context(bs);
1916 aio_context_acquire(aio_context);
1917
1918 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1919 goto out;
1920 }
1921 if (!blk_dev_has_removable_media(blk)) {
1922 error_setg(errp, "Device '%s' is not removable",
1923 bdrv_get_device_name(bs));
1924 goto out;
1925 }
1926
1927 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1928 blk_dev_eject_request(blk, force);
1929 if (!force) {
1930 error_setg(errp, "Device '%s' is locked",
1931 bdrv_get_device_name(bs));
1932 goto out;
1933 }
1934 }
1935
1936 bdrv_close(bs);
1937
1938 out:
1939 aio_context_release(aio_context);
1940 }
1941
1942 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1943 {
1944 BlockBackend *blk;
1945
1946 blk = blk_by_name(device);
1947 if (!blk) {
1948 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1949 "Device '%s' not found", device);
1950 return;
1951 }
1952
1953 eject_device(blk, force, errp);
1954 }
1955
1956 void qmp_block_passwd(bool has_device, const char *device,
1957 bool has_node_name, const char *node_name,
1958 const char *password, Error **errp)
1959 {
1960 Error *local_err = NULL;
1961 BlockDriverState *bs;
1962 AioContext *aio_context;
1963
1964 bs = bdrv_lookup_bs(has_device ? device : NULL,
1965 has_node_name ? node_name : NULL,
1966 &local_err);
1967 if (local_err) {
1968 error_propagate(errp, local_err);
1969 return;
1970 }
1971
1972 aio_context = bdrv_get_aio_context(bs);
1973 aio_context_acquire(aio_context);
1974
1975 bdrv_add_key(bs, password, errp);
1976
1977 aio_context_release(aio_context);
1978 }
1979
1980 /* Assumes AioContext is held */
1981 static void qmp_bdrv_open_encrypted(BlockDriverState **pbs,
1982 const char *filename,
1983 int bdrv_flags, const char *format,
1984 const char *password, Error **errp)
1985 {
1986 Error *local_err = NULL;
1987 QDict *options = NULL;
1988 int ret;
1989
1990 if (format) {
1991 options = qdict_new();
1992 qdict_put(options, "driver", qstring_from_str(format));
1993 }
1994
1995 ret = bdrv_open(pbs, filename, NULL, options, bdrv_flags, &local_err);
1996 if (ret < 0) {
1997 error_propagate(errp, local_err);
1998 return;
1999 }
2000
2001 bdrv_add_key(*pbs, password, errp);
2002 }
2003
2004 void qmp_change_blockdev(const char *device, const char *filename,
2005 const char *format, Error **errp)
2006 {
2007 BlockBackend *blk;
2008 BlockDriverState *bs;
2009 AioContext *aio_context;
2010 int bdrv_flags;
2011 bool new_bs;
2012 Error *err = NULL;
2013
2014 blk = blk_by_name(device);
2015 if (!blk) {
2016 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2017 "Device '%s' not found", device);
2018 return;
2019 }
2020 bs = blk_bs(blk);
2021 new_bs = !bs;
2022
2023 aio_context = blk_get_aio_context(blk);
2024 aio_context_acquire(aio_context);
2025
2026 eject_device(blk, 0, &err);
2027 if (err) {
2028 error_propagate(errp, err);
2029 goto out;
2030 }
2031
2032 bdrv_flags = blk_is_read_only(blk) ? 0 : BDRV_O_RDWR;
2033 bdrv_flags |= blk_get_root_state(blk)->open_flags & ~BDRV_O_RDWR;
2034
2035 qmp_bdrv_open_encrypted(&bs, filename, bdrv_flags, format, NULL, &err);
2036 if (err) {
2037 error_propagate(errp, err);
2038 goto out;
2039 }
2040
2041 if (new_bs) {
2042 blk_insert_bs(blk, bs);
2043 /* Has been sent automatically by bdrv_open() if blk_bs(blk) was not
2044 * NULL */
2045 blk_dev_change_media_cb(blk, true);
2046 }
2047
2048 out:
2049 aio_context_release(aio_context);
2050 }
2051
2052 /* throttling disk I/O limits */
2053 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2054 int64_t bps_wr,
2055 int64_t iops,
2056 int64_t iops_rd,
2057 int64_t iops_wr,
2058 bool has_bps_max,
2059 int64_t bps_max,
2060 bool has_bps_rd_max,
2061 int64_t bps_rd_max,
2062 bool has_bps_wr_max,
2063 int64_t bps_wr_max,
2064 bool has_iops_max,
2065 int64_t iops_max,
2066 bool has_iops_rd_max,
2067 int64_t iops_rd_max,
2068 bool has_iops_wr_max,
2069 int64_t iops_wr_max,
2070 bool has_iops_size,
2071 int64_t iops_size,
2072 bool has_group,
2073 const char *group, Error **errp)
2074 {
2075 ThrottleConfig cfg;
2076 BlockDriverState *bs;
2077 BlockBackend *blk;
2078 AioContext *aio_context;
2079
2080 blk = blk_by_name(device);
2081 if (!blk) {
2082 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2083 "Device '%s' not found", device);
2084 return;
2085 }
2086
2087 aio_context = blk_get_aio_context(blk);
2088 aio_context_acquire(aio_context);
2089
2090 bs = blk_bs(blk);
2091 if (!bs) {
2092 error_setg(errp, "Device '%s' has no medium", device);
2093 goto out;
2094 }
2095
2096 memset(&cfg, 0, sizeof(cfg));
2097 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2098 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2099 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2100
2101 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2102 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2103 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2104
2105 if (has_bps_max) {
2106 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2107 }
2108 if (has_bps_rd_max) {
2109 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2110 }
2111 if (has_bps_wr_max) {
2112 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2113 }
2114 if (has_iops_max) {
2115 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2116 }
2117 if (has_iops_rd_max) {
2118 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2119 }
2120 if (has_iops_wr_max) {
2121 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2122 }
2123
2124 if (has_iops_size) {
2125 cfg.op_size = iops_size;
2126 }
2127
2128 if (!check_throttle_config(&cfg, errp)) {
2129 goto out;
2130 }
2131
2132 if (throttle_enabled(&cfg)) {
2133 /* Enable I/O limits if they're not enabled yet, otherwise
2134 * just update the throttling group. */
2135 if (!bs->io_limits_enabled) {
2136 bdrv_io_limits_enable(bs, has_group ? group : device);
2137 } else if (has_group) {
2138 bdrv_io_limits_update_group(bs, group);
2139 }
2140 /* Set the new throttling configuration */
2141 bdrv_set_io_limits(bs, &cfg);
2142 } else if (bs->io_limits_enabled) {
2143 /* If all throttling settings are set to 0, disable I/O limits */
2144 bdrv_io_limits_disable(bs);
2145 }
2146
2147 out:
2148 aio_context_release(aio_context);
2149 }
2150
2151 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2152 bool has_granularity, uint32_t granularity,
2153 Error **errp)
2154 {
2155 AioContext *aio_context;
2156 BlockDriverState *bs;
2157
2158 if (!name || name[0] == '\0') {
2159 error_setg(errp, "Bitmap name cannot be empty");
2160 return;
2161 }
2162
2163 bs = bdrv_lookup_bs(node, node, errp);
2164 if (!bs) {
2165 return;
2166 }
2167
2168 aio_context = bdrv_get_aio_context(bs);
2169 aio_context_acquire(aio_context);
2170
2171 if (has_granularity) {
2172 if (granularity < 512 || !is_power_of_2(granularity)) {
2173 error_setg(errp, "Granularity must be power of 2 "
2174 "and at least 512");
2175 goto out;
2176 }
2177 } else {
2178 /* Default to cluster size, if available: */
2179 granularity = bdrv_get_default_bitmap_granularity(bs);
2180 }
2181
2182 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2183
2184 out:
2185 aio_context_release(aio_context);
2186 }
2187
2188 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2189 Error **errp)
2190 {
2191 AioContext *aio_context;
2192 BlockDriverState *bs;
2193 BdrvDirtyBitmap *bitmap;
2194
2195 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2196 if (!bitmap || !bs) {
2197 return;
2198 }
2199
2200 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2201 error_setg(errp,
2202 "Bitmap '%s' is currently frozen and cannot be removed",
2203 name);
2204 goto out;
2205 }
2206 bdrv_dirty_bitmap_make_anon(bitmap);
2207 bdrv_release_dirty_bitmap(bs, bitmap);
2208
2209 out:
2210 aio_context_release(aio_context);
2211 }
2212
2213 /**
2214 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2215 * immediately after a full backup operation.
2216 */
2217 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2218 Error **errp)
2219 {
2220 AioContext *aio_context;
2221 BdrvDirtyBitmap *bitmap;
2222 BlockDriverState *bs;
2223
2224 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2225 if (!bitmap || !bs) {
2226 return;
2227 }
2228
2229 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2230 error_setg(errp,
2231 "Bitmap '%s' is currently frozen and cannot be modified",
2232 name);
2233 goto out;
2234 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2235 error_setg(errp,
2236 "Bitmap '%s' is currently disabled and cannot be cleared",
2237 name);
2238 goto out;
2239 }
2240
2241 bdrv_clear_dirty_bitmap(bitmap);
2242
2243 out:
2244 aio_context_release(aio_context);
2245 }
2246
2247 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2248 {
2249 const char *id = qdict_get_str(qdict, "id");
2250 BlockBackend *blk;
2251 BlockDriverState *bs;
2252 AioContext *aio_context;
2253 Error *local_err = NULL;
2254
2255 blk = blk_by_name(id);
2256 if (!blk) {
2257 error_report("Device '%s' not found", id);
2258 return;
2259 }
2260
2261 if (!blk_legacy_dinfo(blk)) {
2262 error_report("Deleting device added with blockdev-add"
2263 " is not supported");
2264 return;
2265 }
2266
2267 aio_context = blk_get_aio_context(blk);
2268 aio_context_acquire(aio_context);
2269
2270 bs = blk_bs(blk);
2271 if (bs) {
2272 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2273 error_report_err(local_err);
2274 aio_context_release(aio_context);
2275 return;
2276 }
2277
2278 bdrv_close(bs);
2279 }
2280
2281 /* if we have a device attached to this BlockDriverState
2282 * then we need to make the drive anonymous until the device
2283 * can be removed. If this is a drive with no device backing
2284 * then we can just get rid of the block driver state right here.
2285 */
2286 if (blk_get_attached_dev(blk)) {
2287 blk_hide_on_behalf_of_hmp_drive_del(blk);
2288 /* Further I/O must not pause the guest */
2289 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2290 BLOCKDEV_ON_ERROR_REPORT);
2291 } else {
2292 blk_unref(blk);
2293 }
2294
2295 aio_context_release(aio_context);
2296 }
2297
2298 void qmp_block_resize(bool has_device, const char *device,
2299 bool has_node_name, const char *node_name,
2300 int64_t size, Error **errp)
2301 {
2302 Error *local_err = NULL;
2303 BlockDriverState *bs;
2304 AioContext *aio_context;
2305 int ret;
2306
2307 bs = bdrv_lookup_bs(has_device ? device : NULL,
2308 has_node_name ? node_name : NULL,
2309 &local_err);
2310 if (local_err) {
2311 error_propagate(errp, local_err);
2312 return;
2313 }
2314
2315 aio_context = bdrv_get_aio_context(bs);
2316 aio_context_acquire(aio_context);
2317
2318 if (!bdrv_is_first_non_filter(bs)) {
2319 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2320 goto out;
2321 }
2322
2323 if (size < 0) {
2324 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2325 goto out;
2326 }
2327
2328 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2329 error_setg(errp, QERR_DEVICE_IN_USE, device);
2330 goto out;
2331 }
2332
2333 /* complete all in-flight operations before resizing the device */
2334 bdrv_drain_all();
2335
2336 ret = bdrv_truncate(bs, size);
2337 switch (ret) {
2338 case 0:
2339 break;
2340 case -ENOMEDIUM:
2341 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2342 break;
2343 case -ENOTSUP:
2344 error_setg(errp, QERR_UNSUPPORTED);
2345 break;
2346 case -EACCES:
2347 error_setg(errp, "Device '%s' is read only", device);
2348 break;
2349 case -EBUSY:
2350 error_setg(errp, QERR_DEVICE_IN_USE, device);
2351 break;
2352 default:
2353 error_setg_errno(errp, -ret, "Could not resize");
2354 break;
2355 }
2356
2357 out:
2358 aio_context_release(aio_context);
2359 }
2360
2361 static void block_job_cb(void *opaque, int ret)
2362 {
2363 /* Note that this function may be executed from another AioContext besides
2364 * the QEMU main loop. If you need to access anything that assumes the
2365 * QEMU global mutex, use a BH or introduce a mutex.
2366 */
2367
2368 BlockDriverState *bs = opaque;
2369 const char *msg = NULL;
2370
2371 trace_block_job_cb(bs, bs->job, ret);
2372
2373 assert(bs->job);
2374
2375 if (ret < 0) {
2376 msg = strerror(-ret);
2377 }
2378
2379 if (block_job_is_cancelled(bs->job)) {
2380 block_job_event_cancelled(bs->job);
2381 } else {
2382 block_job_event_completed(bs->job, msg);
2383 }
2384
2385 bdrv_put_ref_bh_schedule(bs);
2386 }
2387
2388 void qmp_block_stream(const char *device,
2389 bool has_base, const char *base,
2390 bool has_backing_file, const char *backing_file,
2391 bool has_speed, int64_t speed,
2392 bool has_on_error, BlockdevOnError on_error,
2393 Error **errp)
2394 {
2395 BlockBackend *blk;
2396 BlockDriverState *bs;
2397 BlockDriverState *base_bs = NULL;
2398 AioContext *aio_context;
2399 Error *local_err = NULL;
2400 const char *base_name = NULL;
2401
2402 if (!has_on_error) {
2403 on_error = BLOCKDEV_ON_ERROR_REPORT;
2404 }
2405
2406 blk = blk_by_name(device);
2407 if (!blk) {
2408 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2409 "Device '%s' not found", device);
2410 return;
2411 }
2412
2413 aio_context = blk_get_aio_context(blk);
2414 aio_context_acquire(aio_context);
2415
2416 if (!blk_is_available(blk)) {
2417 error_setg(errp, "Device '%s' has no medium", device);
2418 goto out;
2419 }
2420 bs = blk_bs(blk);
2421
2422 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2423 goto out;
2424 }
2425
2426 if (has_base) {
2427 base_bs = bdrv_find_backing_image(bs, base);
2428 if (base_bs == NULL) {
2429 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2430 goto out;
2431 }
2432 assert(bdrv_get_aio_context(base_bs) == aio_context);
2433 base_name = base;
2434 }
2435
2436 /* if we are streaming the entire chain, the result will have no backing
2437 * file, and specifying one is therefore an error */
2438 if (base_bs == NULL && has_backing_file) {
2439 error_setg(errp, "backing file specified, but streaming the "
2440 "entire chain");
2441 goto out;
2442 }
2443
2444 /* backing_file string overrides base bs filename */
2445 base_name = has_backing_file ? backing_file : base_name;
2446
2447 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2448 on_error, block_job_cb, bs, &local_err);
2449 if (local_err) {
2450 error_propagate(errp, local_err);
2451 goto out;
2452 }
2453
2454 trace_qmp_block_stream(bs, bs->job);
2455
2456 out:
2457 aio_context_release(aio_context);
2458 }
2459
2460 void qmp_block_commit(const char *device,
2461 bool has_base, const char *base,
2462 bool has_top, const char *top,
2463 bool has_backing_file, const char *backing_file,
2464 bool has_speed, int64_t speed,
2465 Error **errp)
2466 {
2467 BlockBackend *blk;
2468 BlockDriverState *bs;
2469 BlockDriverState *base_bs, *top_bs;
2470 AioContext *aio_context;
2471 Error *local_err = NULL;
2472 /* This will be part of the QMP command, if/when the
2473 * BlockdevOnError change for blkmirror makes it in
2474 */
2475 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2476
2477 if (!has_speed) {
2478 speed = 0;
2479 }
2480
2481 /* Important Note:
2482 * libvirt relies on the DeviceNotFound error class in order to probe for
2483 * live commit feature versions; for this to work, we must make sure to
2484 * perform the device lookup before any generic errors that may occur in a
2485 * scenario in which all optional arguments are omitted. */
2486 blk = blk_by_name(device);
2487 if (!blk) {
2488 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2489 "Device '%s' not found", device);
2490 return;
2491 }
2492
2493 aio_context = blk_get_aio_context(blk);
2494 aio_context_acquire(aio_context);
2495
2496 if (!blk_is_available(blk)) {
2497 error_setg(errp, "Device '%s' has no medium", device);
2498 goto out;
2499 }
2500 bs = blk_bs(blk);
2501
2502 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2503 goto out;
2504 }
2505
2506 /* default top_bs is the active layer */
2507 top_bs = bs;
2508
2509 if (has_top && top) {
2510 if (strcmp(bs->filename, top) != 0) {
2511 top_bs = bdrv_find_backing_image(bs, top);
2512 }
2513 }
2514
2515 if (top_bs == NULL) {
2516 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2517 goto out;
2518 }
2519
2520 assert(bdrv_get_aio_context(top_bs) == aio_context);
2521
2522 if (has_base && base) {
2523 base_bs = bdrv_find_backing_image(top_bs, base);
2524 } else {
2525 base_bs = bdrv_find_base(top_bs);
2526 }
2527
2528 if (base_bs == NULL) {
2529 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2530 goto out;
2531 }
2532
2533 assert(bdrv_get_aio_context(base_bs) == aio_context);
2534
2535 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2536 goto out;
2537 }
2538
2539 /* Do not allow attempts to commit an image into itself */
2540 if (top_bs == base_bs) {
2541 error_setg(errp, "cannot commit an image into itself");
2542 goto out;
2543 }
2544
2545 if (top_bs == bs) {
2546 if (has_backing_file) {
2547 error_setg(errp, "'backing-file' specified,"
2548 " but 'top' is the active layer");
2549 goto out;
2550 }
2551 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2552 bs, &local_err);
2553 } else {
2554 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2555 has_backing_file ? backing_file : NULL, &local_err);
2556 }
2557 if (local_err != NULL) {
2558 error_propagate(errp, local_err);
2559 goto out;
2560 }
2561
2562 out:
2563 aio_context_release(aio_context);
2564 }
2565
2566 void qmp_drive_backup(const char *device, const char *target,
2567 bool has_format, const char *format,
2568 enum MirrorSyncMode sync,
2569 bool has_mode, enum NewImageMode mode,
2570 bool has_speed, int64_t speed,
2571 bool has_bitmap, const char *bitmap,
2572 bool has_on_source_error, BlockdevOnError on_source_error,
2573 bool has_on_target_error, BlockdevOnError on_target_error,
2574 Error **errp)
2575 {
2576 BlockBackend *blk;
2577 BlockDriverState *bs;
2578 BlockDriverState *target_bs;
2579 BlockDriverState *source = NULL;
2580 BdrvDirtyBitmap *bmap = NULL;
2581 AioContext *aio_context;
2582 QDict *options = NULL;
2583 Error *local_err = NULL;
2584 int flags;
2585 int64_t size;
2586 int ret;
2587
2588 if (!has_speed) {
2589 speed = 0;
2590 }
2591 if (!has_on_source_error) {
2592 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2593 }
2594 if (!has_on_target_error) {
2595 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2596 }
2597 if (!has_mode) {
2598 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2599 }
2600
2601 blk = blk_by_name(device);
2602 if (!blk) {
2603 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2604 "Device '%s' not found", device);
2605 return;
2606 }
2607
2608 aio_context = blk_get_aio_context(blk);
2609 aio_context_acquire(aio_context);
2610
2611 /* Although backup_run has this check too, we need to use bs->drv below, so
2612 * do an early check redundantly. */
2613 if (!blk_is_available(blk)) {
2614 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2615 goto out;
2616 }
2617 bs = blk_bs(blk);
2618
2619 if (!has_format) {
2620 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2621 }
2622
2623 /* Early check to avoid creating target */
2624 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2625 goto out;
2626 }
2627
2628 flags = bs->open_flags | BDRV_O_RDWR;
2629
2630 /* See if we have a backing HD we can use to create our new image
2631 * on top of. */
2632 if (sync == MIRROR_SYNC_MODE_TOP) {
2633 source = backing_bs(bs);
2634 if (!source) {
2635 sync = MIRROR_SYNC_MODE_FULL;
2636 }
2637 }
2638 if (sync == MIRROR_SYNC_MODE_NONE) {
2639 source = bs;
2640 }
2641
2642 size = bdrv_getlength(bs);
2643 if (size < 0) {
2644 error_setg_errno(errp, -size, "bdrv_getlength failed");
2645 goto out;
2646 }
2647
2648 if (mode != NEW_IMAGE_MODE_EXISTING) {
2649 assert(format);
2650 if (source) {
2651 bdrv_img_create(target, format, source->filename,
2652 source->drv->format_name, NULL,
2653 size, flags, &local_err, false);
2654 } else {
2655 bdrv_img_create(target, format, NULL, NULL, NULL,
2656 size, flags, &local_err, false);
2657 }
2658 }
2659
2660 if (local_err) {
2661 error_propagate(errp, local_err);
2662 goto out;
2663 }
2664
2665 if (format) {
2666 options = qdict_new();
2667 qdict_put(options, "driver", qstring_from_str(format));
2668 }
2669
2670 target_bs = NULL;
2671 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
2672 if (ret < 0) {
2673 error_propagate(errp, local_err);
2674 goto out;
2675 }
2676
2677 bdrv_set_aio_context(target_bs, aio_context);
2678
2679 if (has_bitmap) {
2680 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
2681 if (!bmap) {
2682 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
2683 goto out;
2684 }
2685 }
2686
2687 backup_start(bs, target_bs, speed, sync, bmap,
2688 on_source_error, on_target_error,
2689 block_job_cb, bs, &local_err);
2690 if (local_err != NULL) {
2691 bdrv_unref(target_bs);
2692 error_propagate(errp, local_err);
2693 goto out;
2694 }
2695
2696 out:
2697 aio_context_release(aio_context);
2698 }
2699
2700 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2701 {
2702 return bdrv_named_nodes_list(errp);
2703 }
2704
2705 void qmp_blockdev_backup(const char *device, const char *target,
2706 enum MirrorSyncMode sync,
2707 bool has_speed, int64_t speed,
2708 bool has_on_source_error,
2709 BlockdevOnError on_source_error,
2710 bool has_on_target_error,
2711 BlockdevOnError on_target_error,
2712 Error **errp)
2713 {
2714 BlockBackend *blk, *target_blk;
2715 BlockDriverState *bs;
2716 BlockDriverState *target_bs;
2717 Error *local_err = NULL;
2718 AioContext *aio_context;
2719
2720 if (!has_speed) {
2721 speed = 0;
2722 }
2723 if (!has_on_source_error) {
2724 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2725 }
2726 if (!has_on_target_error) {
2727 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2728 }
2729
2730 blk = blk_by_name(device);
2731 if (!blk) {
2732 error_setg(errp, "Device '%s' not found", device);
2733 return;
2734 }
2735
2736 aio_context = blk_get_aio_context(blk);
2737 aio_context_acquire(aio_context);
2738
2739 if (!blk_is_available(blk)) {
2740 error_setg(errp, "Device '%s' has no medium", device);
2741 goto out;
2742 }
2743 bs = blk_bs(blk);
2744
2745 target_blk = blk_by_name(target);
2746 if (!target_blk) {
2747 error_setg(errp, "Device '%s' not found", target);
2748 goto out;
2749 }
2750
2751 if (!blk_is_available(target_blk)) {
2752 error_setg(errp, "Device '%s' has no medium", target);
2753 goto out;
2754 }
2755 target_bs = blk_bs(target_blk);
2756
2757 bdrv_ref(target_bs);
2758 bdrv_set_aio_context(target_bs, aio_context);
2759 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
2760 on_target_error, block_job_cb, bs, &local_err);
2761 if (local_err != NULL) {
2762 bdrv_unref(target_bs);
2763 error_propagate(errp, local_err);
2764 }
2765 out:
2766 aio_context_release(aio_context);
2767 }
2768
2769 void qmp_drive_mirror(const char *device, const char *target,
2770 bool has_format, const char *format,
2771 bool has_node_name, const char *node_name,
2772 bool has_replaces, const char *replaces,
2773 enum MirrorSyncMode sync,
2774 bool has_mode, enum NewImageMode mode,
2775 bool has_speed, int64_t speed,
2776 bool has_granularity, uint32_t granularity,
2777 bool has_buf_size, int64_t buf_size,
2778 bool has_on_source_error, BlockdevOnError on_source_error,
2779 bool has_on_target_error, BlockdevOnError on_target_error,
2780 bool has_unmap, bool unmap,
2781 Error **errp)
2782 {
2783 BlockBackend *blk;
2784 BlockDriverState *bs;
2785 BlockDriverState *source, *target_bs;
2786 AioContext *aio_context;
2787 Error *local_err = NULL;
2788 QDict *options;
2789 int flags;
2790 int64_t size;
2791 int ret;
2792
2793 if (!has_speed) {
2794 speed = 0;
2795 }
2796 if (!has_on_source_error) {
2797 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2798 }
2799 if (!has_on_target_error) {
2800 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2801 }
2802 if (!has_mode) {
2803 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2804 }
2805 if (!has_granularity) {
2806 granularity = 0;
2807 }
2808 if (!has_buf_size) {
2809 buf_size = 0;
2810 }
2811 if (!has_unmap) {
2812 unmap = true;
2813 }
2814
2815 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2816 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2817 "a value in range [512B, 64MB]");
2818 return;
2819 }
2820 if (granularity & (granularity - 1)) {
2821 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2822 "power of 2");
2823 return;
2824 }
2825
2826 blk = blk_by_name(device);
2827 if (!blk) {
2828 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2829 "Device '%s' not found", device);
2830 return;
2831 }
2832
2833 aio_context = blk_get_aio_context(blk);
2834 aio_context_acquire(aio_context);
2835
2836 if (!blk_is_available(blk)) {
2837 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2838 goto out;
2839 }
2840 bs = blk_bs(blk);
2841
2842 if (!has_format) {
2843 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2844 }
2845
2846 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2847 goto out;
2848 }
2849
2850 flags = bs->open_flags | BDRV_O_RDWR;
2851 source = backing_bs(bs);
2852 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2853 sync = MIRROR_SYNC_MODE_FULL;
2854 }
2855 if (sync == MIRROR_SYNC_MODE_NONE) {
2856 source = bs;
2857 }
2858
2859 size = bdrv_getlength(bs);
2860 if (size < 0) {
2861 error_setg_errno(errp, -size, "bdrv_getlength failed");
2862 goto out;
2863 }
2864
2865 if (has_replaces) {
2866 BlockDriverState *to_replace_bs;
2867 AioContext *replace_aio_context;
2868 int64_t replace_size;
2869
2870 if (!has_node_name) {
2871 error_setg(errp, "a node-name must be provided when replacing a"
2872 " named node of the graph");
2873 goto out;
2874 }
2875
2876 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
2877
2878 if (!to_replace_bs) {
2879 error_propagate(errp, local_err);
2880 goto out;
2881 }
2882
2883 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2884 aio_context_acquire(replace_aio_context);
2885 replace_size = bdrv_getlength(to_replace_bs);
2886 aio_context_release(replace_aio_context);
2887
2888 if (size != replace_size) {
2889 error_setg(errp, "cannot replace image with a mirror image of "
2890 "different size");
2891 goto out;
2892 }
2893 }
2894
2895 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2896 && mode != NEW_IMAGE_MODE_EXISTING)
2897 {
2898 /* create new image w/o backing file */
2899 assert(format);
2900 bdrv_img_create(target, format,
2901 NULL, NULL, NULL, size, flags, &local_err, false);
2902 } else {
2903 switch (mode) {
2904 case NEW_IMAGE_MODE_EXISTING:
2905 break;
2906 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2907 /* create new image with backing file */
2908 bdrv_img_create(target, format,
2909 source->filename,
2910 source->drv->format_name,
2911 NULL, size, flags, &local_err, false);
2912 break;
2913 default:
2914 abort();
2915 }
2916 }
2917
2918 if (local_err) {
2919 error_propagate(errp, local_err);
2920 goto out;
2921 }
2922
2923 options = qdict_new();
2924 if (has_node_name) {
2925 qdict_put(options, "node-name", qstring_from_str(node_name));
2926 }
2927 if (format) {
2928 qdict_put(options, "driver", qstring_from_str(format));
2929 }
2930
2931 /* Mirroring takes care of copy-on-write using the source's backing
2932 * file.
2933 */
2934 target_bs = NULL;
2935 ret = bdrv_open(&target_bs, target, NULL, options,
2936 flags | BDRV_O_NO_BACKING, &local_err);
2937 if (ret < 0) {
2938 error_propagate(errp, local_err);
2939 goto out;
2940 }
2941
2942 bdrv_set_aio_context(target_bs, aio_context);
2943
2944 /* pass the node name to replace to mirror start since it's loose coupling
2945 * and will allow to check whether the node still exist at mirror completion
2946 */
2947 mirror_start(bs, target_bs,
2948 has_replaces ? replaces : NULL,
2949 speed, granularity, buf_size, sync,
2950 on_source_error, on_target_error,
2951 unmap,
2952 block_job_cb, bs, &local_err);
2953 if (local_err != NULL) {
2954 bdrv_unref(target_bs);
2955 error_propagate(errp, local_err);
2956 goto out;
2957 }
2958
2959 out:
2960 aio_context_release(aio_context);
2961 }
2962
2963 /* Get the block job for a given device name and acquire its AioContext */
2964 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
2965 Error **errp)
2966 {
2967 BlockBackend *blk;
2968 BlockDriverState *bs;
2969
2970 *aio_context = NULL;
2971
2972 blk = blk_by_name(device);
2973 if (!blk) {
2974 goto notfound;
2975 }
2976
2977 *aio_context = blk_get_aio_context(blk);
2978 aio_context_acquire(*aio_context);
2979
2980 if (!blk_is_available(blk)) {
2981 goto notfound;
2982 }
2983 bs = blk_bs(blk);
2984
2985 if (!bs->job) {
2986 goto notfound;
2987 }
2988
2989 return bs->job;
2990
2991 notfound:
2992 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
2993 "No active block job on device '%s'", device);
2994 if (*aio_context) {
2995 aio_context_release(*aio_context);
2996 *aio_context = NULL;
2997 }
2998 return NULL;
2999 }
3000
3001 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3002 {
3003 AioContext *aio_context;
3004 BlockJob *job = find_block_job(device, &aio_context, errp);
3005
3006 if (!job) {
3007 return;
3008 }
3009
3010 block_job_set_speed(job, speed, errp);
3011 aio_context_release(aio_context);
3012 }
3013
3014 void qmp_block_job_cancel(const char *device,
3015 bool has_force, bool force, Error **errp)
3016 {
3017 AioContext *aio_context;
3018 BlockJob *job = find_block_job(device, &aio_context, errp);
3019
3020 if (!job) {
3021 return;
3022 }
3023
3024 if (!has_force) {
3025 force = false;
3026 }
3027
3028 if (job->user_paused && !force) {
3029 error_setg(errp, "The block job for device '%s' is currently paused",
3030 device);
3031 goto out;
3032 }
3033
3034 trace_qmp_block_job_cancel(job);
3035 block_job_cancel(job);
3036 out:
3037 aio_context_release(aio_context);
3038 }
3039
3040 void qmp_block_job_pause(const char *device, Error **errp)
3041 {
3042 AioContext *aio_context;
3043 BlockJob *job = find_block_job(device, &aio_context, errp);
3044
3045 if (!job || job->user_paused) {
3046 return;
3047 }
3048
3049 job->user_paused = true;
3050 trace_qmp_block_job_pause(job);
3051 block_job_pause(job);
3052 aio_context_release(aio_context);
3053 }
3054
3055 void qmp_block_job_resume(const char *device, Error **errp)
3056 {
3057 AioContext *aio_context;
3058 BlockJob *job = find_block_job(device, &aio_context, errp);
3059
3060 if (!job || !job->user_paused) {
3061 return;
3062 }
3063
3064 job->user_paused = false;
3065 trace_qmp_block_job_resume(job);
3066 block_job_resume(job);
3067 aio_context_release(aio_context);
3068 }
3069
3070 void qmp_block_job_complete(const char *device, Error **errp)
3071 {
3072 AioContext *aio_context;
3073 BlockJob *job = find_block_job(device, &aio_context, errp);
3074
3075 if (!job) {
3076 return;
3077 }
3078
3079 trace_qmp_block_job_complete(job);
3080 block_job_complete(job, errp);
3081 aio_context_release(aio_context);
3082 }
3083
3084 void qmp_change_backing_file(const char *device,
3085 const char *image_node_name,
3086 const char *backing_file,
3087 Error **errp)
3088 {
3089 BlockBackend *blk;
3090 BlockDriverState *bs = NULL;
3091 AioContext *aio_context;
3092 BlockDriverState *image_bs = NULL;
3093 Error *local_err = NULL;
3094 bool ro;
3095 int open_flags;
3096 int ret;
3097
3098 blk = blk_by_name(device);
3099 if (!blk) {
3100 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3101 "Device '%s' not found", device);
3102 return;
3103 }
3104
3105 aio_context = blk_get_aio_context(blk);
3106 aio_context_acquire(aio_context);
3107
3108 if (!blk_is_available(blk)) {
3109 error_setg(errp, "Device '%s' has no medium", device);
3110 goto out;
3111 }
3112 bs = blk_bs(blk);
3113
3114 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3115 if (local_err) {
3116 error_propagate(errp, local_err);
3117 goto out;
3118 }
3119
3120 if (!image_bs) {
3121 error_setg(errp, "image file not found");
3122 goto out;
3123 }
3124
3125 if (bdrv_find_base(image_bs) == image_bs) {
3126 error_setg(errp, "not allowing backing file change on an image "
3127 "without a backing file");
3128 goto out;
3129 }
3130
3131 /* even though we are not necessarily operating on bs, we need it to
3132 * determine if block ops are currently prohibited on the chain */
3133 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3134 goto out;
3135 }
3136
3137 /* final sanity check */
3138 if (!bdrv_chain_contains(bs, image_bs)) {
3139 error_setg(errp, "'%s' and image file are not in the same chain",
3140 device);
3141 goto out;
3142 }
3143
3144 /* if not r/w, reopen to make r/w */
3145 open_flags = image_bs->open_flags;
3146 ro = bdrv_is_read_only(image_bs);
3147
3148 if (ro) {
3149 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3150 if (local_err) {
3151 error_propagate(errp, local_err);
3152 goto out;
3153 }
3154 }
3155
3156 ret = bdrv_change_backing_file(image_bs, backing_file,
3157 image_bs->drv ? image_bs->drv->format_name : "");
3158
3159 if (ret < 0) {
3160 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3161 backing_file);
3162 /* don't exit here, so we can try to restore open flags if
3163 * appropriate */
3164 }
3165
3166 if (ro) {
3167 bdrv_reopen(image_bs, open_flags, &local_err);
3168 if (local_err) {
3169 error_propagate(errp, local_err); /* will preserve prior errp */
3170 }
3171 }
3172
3173 out:
3174 aio_context_release(aio_context);
3175 }
3176
3177 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3178 {
3179 QmpOutputVisitor *ov = qmp_output_visitor_new();
3180 BlockDriverState *bs;
3181 BlockBackend *blk = NULL;
3182 QObject *obj;
3183 QDict *qdict;
3184 Error *local_err = NULL;
3185
3186 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3187 * cache.direct=false instead of silently switching to aio=threads, except
3188 * when called from drive_new().
3189 *
3190 * For now, simply forbidding the combination for all drivers will do. */
3191 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3192 bool direct = options->has_cache &&
3193 options->cache->has_direct &&
3194 options->cache->direct;
3195 if (!direct) {
3196 error_setg(errp, "aio=native requires cache.direct=true");
3197 goto fail;
3198 }
3199 }
3200
3201 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3202 &options, NULL, &local_err);
3203 if (local_err) {
3204 error_propagate(errp, local_err);
3205 goto fail;
3206 }
3207
3208 obj = qmp_output_get_qobject(ov);
3209 qdict = qobject_to_qdict(obj);
3210
3211 qdict_flatten(qdict);
3212
3213 if (options->has_id) {
3214 blk = blockdev_init(NULL, qdict, &local_err);
3215 if (local_err) {
3216 error_propagate(errp, local_err);
3217 goto fail;
3218 }
3219
3220 bs = blk_bs(blk);
3221 } else {
3222 if (!qdict_get_try_str(qdict, "node-name")) {
3223 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3224 "the root node");
3225 goto fail;
3226 }
3227
3228 bs = bds_tree_init(qdict, errp);
3229 if (!bs) {
3230 goto fail;
3231 }
3232 }
3233
3234 if (bs && bdrv_key_required(bs)) {
3235 if (blk) {
3236 blk_unref(blk);
3237 } else {
3238 bdrv_unref(bs);
3239 }
3240 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3241 goto fail;
3242 }
3243
3244 fail:
3245 qmp_output_visitor_cleanup(ov);
3246 }
3247
3248 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3249 {
3250 BlockJobInfoList *head = NULL, **p_next = &head;
3251 BlockDriverState *bs;
3252
3253 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3254 AioContext *aio_context = bdrv_get_aio_context(bs);
3255
3256 aio_context_acquire(aio_context);
3257
3258 if (bs->job) {
3259 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3260 elem->value = block_job_query(bs->job);
3261 *p_next = elem;
3262 p_next = &elem->next;
3263 }
3264
3265 aio_context_release(aio_context);
3266 }
3267
3268 return head;
3269 }
3270
3271 QemuOptsList qemu_common_drive_opts = {
3272 .name = "drive",
3273 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3274 .desc = {
3275 {
3276 .name = "snapshot",
3277 .type = QEMU_OPT_BOOL,
3278 .help = "enable/disable snapshot mode",
3279 },{
3280 .name = "discard",
3281 .type = QEMU_OPT_STRING,
3282 .help = "discard operation (ignore/off, unmap/on)",
3283 },{
3284 .name = BDRV_OPT_CACHE_WB,
3285 .type = QEMU_OPT_BOOL,
3286 .help = "enables writeback mode for any caches",
3287 },{
3288 .name = BDRV_OPT_CACHE_DIRECT,
3289 .type = QEMU_OPT_BOOL,
3290 .help = "enables use of O_DIRECT (bypass the host page cache)",
3291 },{
3292 .name = BDRV_OPT_CACHE_NO_FLUSH,
3293 .type = QEMU_OPT_BOOL,
3294 .help = "ignore any flush requests for the device",
3295 },{
3296 .name = "aio",
3297 .type = QEMU_OPT_STRING,
3298 .help = "host AIO implementation (threads, native)",
3299 },{
3300 .name = "format",
3301 .type = QEMU_OPT_STRING,
3302 .help = "disk format (raw, qcow2, ...)",
3303 },{
3304 .name = "rerror",
3305 .type = QEMU_OPT_STRING,
3306 .help = "read error action",
3307 },{
3308 .name = "werror",
3309 .type = QEMU_OPT_STRING,
3310 .help = "write error action",
3311 },{
3312 .name = "read-only",
3313 .type = QEMU_OPT_BOOL,
3314 .help = "open drive file as read-only",
3315 },{
3316 .name = "throttling.iops-total",
3317 .type = QEMU_OPT_NUMBER,
3318 .help = "limit total I/O operations per second",
3319 },{
3320 .name = "throttling.iops-read",
3321 .type = QEMU_OPT_NUMBER,
3322 .help = "limit read operations per second",
3323 },{
3324 .name = "throttling.iops-write",
3325 .type = QEMU_OPT_NUMBER,
3326 .help = "limit write operations per second",
3327 },{
3328 .name = "throttling.bps-total",
3329 .type = QEMU_OPT_NUMBER,
3330 .help = "limit total bytes per second",
3331 },{
3332 .name = "throttling.bps-read",
3333 .type = QEMU_OPT_NUMBER,
3334 .help = "limit read bytes per second",
3335 },{
3336 .name = "throttling.bps-write",
3337 .type = QEMU_OPT_NUMBER,
3338 .help = "limit write bytes per second",
3339 },{
3340 .name = "throttling.iops-total-max",
3341 .type = QEMU_OPT_NUMBER,
3342 .help = "I/O operations burst",
3343 },{
3344 .name = "throttling.iops-read-max",
3345 .type = QEMU_OPT_NUMBER,
3346 .help = "I/O operations read burst",
3347 },{
3348 .name = "throttling.iops-write-max",
3349 .type = QEMU_OPT_NUMBER,
3350 .help = "I/O operations write burst",
3351 },{
3352 .name = "throttling.bps-total-max",
3353 .type = QEMU_OPT_NUMBER,
3354 .help = "total bytes burst",
3355 },{
3356 .name = "throttling.bps-read-max",
3357 .type = QEMU_OPT_NUMBER,
3358 .help = "total bytes read burst",
3359 },{
3360 .name = "throttling.bps-write-max",
3361 .type = QEMU_OPT_NUMBER,
3362 .help = "total bytes write burst",
3363 },{
3364 .name = "throttling.iops-size",
3365 .type = QEMU_OPT_NUMBER,
3366 .help = "when limiting by iops max size of an I/O in bytes",
3367 },{
3368 .name = "throttling.group",
3369 .type = QEMU_OPT_STRING,
3370 .help = "name of the block throttling group",
3371 },{
3372 .name = "copy-on-read",
3373 .type = QEMU_OPT_BOOL,
3374 .help = "copy read data from backing file into image file",
3375 },{
3376 .name = "detect-zeroes",
3377 .type = QEMU_OPT_STRING,
3378 .help = "try to optimize zero writes (off, on, unmap)",
3379 },
3380 { /* end of list */ }
3381 },
3382 };
3383
3384 static QemuOptsList qemu_root_bds_opts = {
3385 .name = "root-bds",
3386 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3387 .desc = {
3388 {
3389 .name = "discard",
3390 .type = QEMU_OPT_STRING,
3391 .help = "discard operation (ignore/off, unmap/on)",
3392 },{
3393 .name = "cache.writeback",
3394 .type = QEMU_OPT_BOOL,
3395 .help = "enables writeback mode for any caches",
3396 },{
3397 .name = "cache.direct",
3398 .type = QEMU_OPT_BOOL,
3399 .help = "enables use of O_DIRECT (bypass the host page cache)",
3400 },{
3401 .name = "cache.no-flush",
3402 .type = QEMU_OPT_BOOL,
3403 .help = "ignore any flush requests for the device",
3404 },{
3405 .name = "aio",
3406 .type = QEMU_OPT_STRING,
3407 .help = "host AIO implementation (threads, native)",
3408 },{
3409 .name = "read-only",
3410 .type = QEMU_OPT_BOOL,
3411 .help = "open drive file as read-only",
3412 },{
3413 .name = "copy-on-read",
3414 .type = QEMU_OPT_BOOL,
3415 .help = "copy read data from backing file into image file",
3416 },{
3417 .name = "detect-zeroes",
3418 .type = QEMU_OPT_STRING,
3419 .help = "try to optimize zero writes (off, on, unmap)",
3420 },
3421 { /* end of list */ }
3422 },
3423 };
3424
3425 QemuOptsList qemu_drive_opts = {
3426 .name = "drive",
3427 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3428 .desc = {
3429 /*
3430 * no elements => accept any params
3431 * validation will happen later
3432 */
3433 { /* end of list */ }
3434 },
3435 };
QEmu