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blockdev: acquire AioContext in change-backing-file
[qemu/ar7.git] / blockdev.c
bloba52f20520dc49bdff6c1227209fc4a98a8911823
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 "monitor/monitor.h"
38 #include "qemu/option.h"
39 #include "qemu/config-file.h"
40 #include "qapi/qmp/types.h"
41 #include "qapi-visit.h"
42 #include "qapi/qmp-output-visitor.h"
43 #include "qapi/util.h"
44 #include "sysemu/sysemu.h"
45 #include "block/block_int.h"
46 #include "qmp-commands.h"
47 #include "trace.h"
48 #include "sysemu/arch_init.h"
49
50 static const char *const if_name[IF_COUNT] = {
51 [IF_NONE] = "none",
52 [IF_IDE] = "ide",
53 [IF_SCSI] = "scsi",
54 [IF_FLOPPY] = "floppy",
55 [IF_PFLASH] = "pflash",
56 [IF_MTD] = "mtd",
57 [IF_SD] = "sd",
58 [IF_VIRTIO] = "virtio",
59 [IF_XEN] = "xen",
60 };
61
62 static int if_max_devs[IF_COUNT] = {
63 /*
64 * Do not change these numbers! They govern how drive option
65 * index maps to unit and bus. That mapping is ABI.
66 *
67 * All controllers used to imlement if=T drives need to support
68 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
69 * Otherwise, some index values map to "impossible" bus, unit
70 * values.
71 *
72 * For instance, if you change [IF_SCSI] to 255, -drive
73 * if=scsi,index=12 no longer means bus=1,unit=5, but
74 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
75 * the drive can't be set up. Regression.
76 */
77 [IF_IDE] = 2,
78 [IF_SCSI] = 7,
79 };
80
81 /**
82 * Boards may call this to offer board-by-board overrides
83 * of the default, global values.
84 */
85 void override_max_devs(BlockInterfaceType type, int max_devs)
86 {
87 BlockBackend *blk;
88 DriveInfo *dinfo;
89
90 if (max_devs <= 0) {
91 return;
92 }
93
94 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
95 dinfo = blk_legacy_dinfo(blk);
96 if (dinfo->type == type) {
97 fprintf(stderr, "Cannot override units-per-bus property of"
98 " the %s interface, because a drive of that type has"
99 " already been added.\n", if_name[type]);
100 g_assert_not_reached();
101 }
102 }
103
104 if_max_devs[type] = max_devs;
105 }
106
107 /*
108 * We automatically delete the drive when a device using it gets
109 * unplugged. Questionable feature, but we can't just drop it.
110 * Device models call blockdev_mark_auto_del() to schedule the
111 * automatic deletion, and generic qdev code calls blockdev_auto_del()
112 * when deletion is actually safe.
113 */
114 void blockdev_mark_auto_del(BlockBackend *blk)
115 {
116 DriveInfo *dinfo = blk_legacy_dinfo(blk);
117 BlockDriverState *bs = blk_bs(blk);
118 AioContext *aio_context;
119
120 if (!dinfo) {
121 return;
122 }
123
124 aio_context = bdrv_get_aio_context(bs);
125 aio_context_acquire(aio_context);
126
127 if (bs->job) {
128 block_job_cancel(bs->job);
129 }
130
131 aio_context_release(aio_context);
132
133 dinfo->auto_del = 1;
134 }
135
136 void blockdev_auto_del(BlockBackend *blk)
137 {
138 DriveInfo *dinfo = blk_legacy_dinfo(blk);
139
140 if (dinfo && dinfo->auto_del) {
141 blk_unref(blk);
142 }
143 }
144
145 /**
146 * Returns the current mapping of how many units per bus
147 * a particular interface can support.
148 *
149 * A positive integer indicates n units per bus.
150 * 0 implies the mapping has not been established.
151 * -1 indicates an invalid BlockInterfaceType was given.
152 */
153 int drive_get_max_devs(BlockInterfaceType type)
154 {
155 if (type >= IF_IDE && type < IF_COUNT) {
156 return if_max_devs[type];
157 }
158
159 return -1;
160 }
161
162 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
163 {
164 int max_devs = if_max_devs[type];
165 return max_devs ? index / max_devs : 0;
166 }
167
168 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
169 {
170 int max_devs = if_max_devs[type];
171 return max_devs ? index % max_devs : index;
172 }
173
174 QemuOpts *drive_def(const char *optstr)
175 {
176 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
177 }
178
179 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
180 const char *optstr)
181 {
182 QemuOpts *opts;
183 char buf[32];
184
185 opts = drive_def(optstr);
186 if (!opts) {
187 return NULL;
188 }
189 if (type != IF_DEFAULT) {
190 qemu_opt_set(opts, "if", if_name[type]);
191 }
192 if (index >= 0) {
193 snprintf(buf, sizeof(buf), "%d", index);
194 qemu_opt_set(opts, "index", buf);
195 }
196 if (file)
197 qemu_opt_set(opts, "file", file);
198 return opts;
199 }
200
201 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
202 {
203 BlockBackend *blk;
204 DriveInfo *dinfo;
205
206 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
207 dinfo = blk_legacy_dinfo(blk);
208 if (dinfo && dinfo->type == type
209 && dinfo->bus == bus && dinfo->unit == unit) {
210 return dinfo;
211 }
212 }
213
214 return NULL;
215 }
216
217 bool drive_check_orphaned(void)
218 {
219 BlockBackend *blk;
220 DriveInfo *dinfo;
221 bool rs = false;
222
223 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
224 dinfo = blk_legacy_dinfo(blk);
225 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
226 /* Unless this is a default drive, this may be an oversight. */
227 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
228 dinfo->type != IF_NONE) {
229 fprintf(stderr, "Warning: Orphaned drive without device: "
230 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
231 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type],
232 dinfo->bus, dinfo->unit);
233 rs = true;
234 }
235 }
236
237 return rs;
238 }
239
240 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
241 {
242 return drive_get(type,
243 drive_index_to_bus_id(type, index),
244 drive_index_to_unit_id(type, index));
245 }
246
247 int drive_get_max_bus(BlockInterfaceType type)
248 {
249 int max_bus;
250 BlockBackend *blk;
251 DriveInfo *dinfo;
252
253 max_bus = -1;
254 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
255 dinfo = blk_legacy_dinfo(blk);
256 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
257 max_bus = dinfo->bus;
258 }
259 }
260 return max_bus;
261 }
262
263 /* Get a block device. This should only be used for single-drive devices
264 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
265 appropriate bus. */
266 DriveInfo *drive_get_next(BlockInterfaceType type)
267 {
268 static int next_block_unit[IF_COUNT];
269
270 return drive_get(type, 0, next_block_unit[type]++);
271 }
272
273 static void bdrv_format_print(void *opaque, const char *name)
274 {
275 error_printf(" %s", name);
276 }
277
278 typedef struct {
279 QEMUBH *bh;
280 BlockDriverState *bs;
281 } BDRVPutRefBH;
282
283 static void bdrv_put_ref_bh(void *opaque)
284 {
285 BDRVPutRefBH *s = opaque;
286
287 bdrv_unref(s->bs);
288 qemu_bh_delete(s->bh);
289 g_free(s);
290 }
291
292 /*
293 * Release a BDS reference in a BH
294 *
295 * It is not safe to use bdrv_unref() from a callback function when the callers
296 * still need the BlockDriverState. In such cases we schedule a BH to release
297 * the reference.
298 */
299 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
300 {
301 BDRVPutRefBH *s;
302
303 s = g_new(BDRVPutRefBH, 1);
304 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
305 s->bs = bs;
306 qemu_bh_schedule(s->bh);
307 }
308
309 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
310 {
311 if (!strcmp(buf, "ignore")) {
312 return BLOCKDEV_ON_ERROR_IGNORE;
313 } else if (!is_read && !strcmp(buf, "enospc")) {
314 return BLOCKDEV_ON_ERROR_ENOSPC;
315 } else if (!strcmp(buf, "stop")) {
316 return BLOCKDEV_ON_ERROR_STOP;
317 } else if (!strcmp(buf, "report")) {
318 return BLOCKDEV_ON_ERROR_REPORT;
319 } else {
320 error_setg(errp, "'%s' invalid %s error action",
321 buf, is_read ? "read" : "write");
322 return -1;
323 }
324 }
325
326 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
327 {
328 if (throttle_conflicting(cfg)) {
329 error_setg(errp, "bps/iops/max total values and read/write values"
330 " cannot be used at the same time");
331 return false;
332 }
333
334 if (!throttle_is_valid(cfg)) {
335 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
336 return false;
337 }
338
339 return true;
340 }
341
342 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
343
344 /* Takes the ownership of bs_opts */
345 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
346 Error **errp)
347 {
348 const char *buf;
349 int ro = 0;
350 int bdrv_flags = 0;
351 int on_read_error, on_write_error;
352 BlockBackend *blk;
353 BlockDriverState *bs;
354 ThrottleConfig cfg;
355 int snapshot = 0;
356 bool copy_on_read;
357 int ret;
358 Error *error = NULL;
359 QemuOpts *opts;
360 const char *id;
361 bool has_driver_specific_opts;
362 BlockdevDetectZeroesOptions detect_zeroes;
363 BlockDriver *drv = NULL;
364
365 /* Check common options by copying from bs_opts to opts, all other options
366 * stay in bs_opts for processing by bdrv_open(). */
367 id = qdict_get_try_str(bs_opts, "id");
368 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
369 if (error) {
370 error_propagate(errp, error);
371 goto err_no_opts;
372 }
373
374 qemu_opts_absorb_qdict(opts, bs_opts, &error);
375 if (error) {
376 error_propagate(errp, error);
377 goto early_err;
378 }
379
380 if (id) {
381 qdict_del(bs_opts, "id");
382 }
383
384 has_driver_specific_opts = !!qdict_size(bs_opts);
385
386 /* extract parameters */
387 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
388 ro = qemu_opt_get_bool(opts, "read-only", 0);
389 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
390
391 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
392 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
393 error_setg(errp, "invalid discard option");
394 goto early_err;
395 }
396 }
397
398 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
399 bdrv_flags |= BDRV_O_CACHE_WB;
400 }
401 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
402 bdrv_flags |= BDRV_O_NOCACHE;
403 }
404 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
405 bdrv_flags |= BDRV_O_NO_FLUSH;
406 }
407
408 #ifdef CONFIG_LINUX_AIO
409 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
410 if (!strcmp(buf, "native")) {
411 bdrv_flags |= BDRV_O_NATIVE_AIO;
412 } else if (!strcmp(buf, "threads")) {
413 /* this is the default */
414 } else {
415 error_setg(errp, "invalid aio option");
416 goto early_err;
417 }
418 }
419 #endif
420
421 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
422 if (is_help_option(buf)) {
423 error_printf("Supported formats:");
424 bdrv_iterate_format(bdrv_format_print, NULL);
425 error_printf("\n");
426 goto early_err;
427 }
428
429 drv = bdrv_find_format(buf);
430 if (!drv) {
431 error_setg(errp, "'%s' invalid format", buf);
432 goto early_err;
433 }
434 }
435
436 /* disk I/O throttling */
437 memset(&cfg, 0, sizeof(cfg));
438 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
439 qemu_opt_get_number(opts, "throttling.bps-total", 0);
440 cfg.buckets[THROTTLE_BPS_READ].avg =
441 qemu_opt_get_number(opts, "throttling.bps-read", 0);
442 cfg.buckets[THROTTLE_BPS_WRITE].avg =
443 qemu_opt_get_number(opts, "throttling.bps-write", 0);
444 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
445 qemu_opt_get_number(opts, "throttling.iops-total", 0);
446 cfg.buckets[THROTTLE_OPS_READ].avg =
447 qemu_opt_get_number(opts, "throttling.iops-read", 0);
448 cfg.buckets[THROTTLE_OPS_WRITE].avg =
449 qemu_opt_get_number(opts, "throttling.iops-write", 0);
450
451 cfg.buckets[THROTTLE_BPS_TOTAL].max =
452 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
453 cfg.buckets[THROTTLE_BPS_READ].max =
454 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
455 cfg.buckets[THROTTLE_BPS_WRITE].max =
456 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
457 cfg.buckets[THROTTLE_OPS_TOTAL].max =
458 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
459 cfg.buckets[THROTTLE_OPS_READ].max =
460 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
461 cfg.buckets[THROTTLE_OPS_WRITE].max =
462 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
463
464 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
465
466 if (!check_throttle_config(&cfg, &error)) {
467 error_propagate(errp, error);
468 goto early_err;
469 }
470
471 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
472 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
473 on_write_error = parse_block_error_action(buf, 0, &error);
474 if (error) {
475 error_propagate(errp, error);
476 goto early_err;
477 }
478 }
479
480 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
481 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
482 on_read_error = parse_block_error_action(buf, 1, &error);
483 if (error) {
484 error_propagate(errp, error);
485 goto early_err;
486 }
487 }
488
489 detect_zeroes =
490 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
491 qemu_opt_get(opts, "detect-zeroes"),
492 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
493 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
494 &error);
495 if (error) {
496 error_propagate(errp, error);
497 goto early_err;
498 }
499
500 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
501 !(bdrv_flags & BDRV_O_UNMAP)) {
502 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
503 "without setting discard operation to unmap");
504 goto early_err;
505 }
506
507 /* init */
508 blk = blk_new_with_bs(qemu_opts_id(opts), errp);
509 if (!blk) {
510 goto early_err;
511 }
512 bs = blk_bs(blk);
513 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
514 bs->read_only = ro;
515 bs->detect_zeroes = detect_zeroes;
516
517 bdrv_set_on_error(bs, on_read_error, on_write_error);
518
519 /* disk I/O throttling */
520 if (throttle_enabled(&cfg)) {
521 bdrv_io_limits_enable(bs);
522 bdrv_set_io_limits(bs, &cfg);
523 }
524
525 if (!file || !*file) {
526 if (has_driver_specific_opts) {
527 file = NULL;
528 } else {
529 QDECREF(bs_opts);
530 qemu_opts_del(opts);
531 return blk;
532 }
533 }
534 if (snapshot) {
535 /* always use cache=unsafe with snapshot */
536 bdrv_flags &= ~BDRV_O_CACHE_MASK;
537 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
538 }
539
540 if (copy_on_read) {
541 bdrv_flags |= BDRV_O_COPY_ON_READ;
542 }
543
544 if (runstate_check(RUN_STATE_INMIGRATE)) {
545 bdrv_flags |= BDRV_O_INCOMING;
546 }
547
548 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
549
550 QINCREF(bs_opts);
551 ret = bdrv_open(&bs, file, NULL, bs_opts, bdrv_flags, drv, &error);
552 assert(bs == blk_bs(blk));
553
554 if (ret < 0) {
555 error_setg(errp, "could not open disk image %s: %s",
556 file ?: blk_name(blk), error_get_pretty(error));
557 error_free(error);
558 goto err;
559 }
560
561 if (bdrv_key_required(bs)) {
562 autostart = 0;
563 }
564
565 QDECREF(bs_opts);
566 qemu_opts_del(opts);
567
568 return blk;
569
570 err:
571 blk_unref(blk);
572 early_err:
573 qemu_opts_del(opts);
574 err_no_opts:
575 QDECREF(bs_opts);
576 return NULL;
577 }
578
579 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
580 Error **errp)
581 {
582 const char *value;
583
584 value = qemu_opt_get(opts, from);
585 if (value) {
586 if (qemu_opt_find(opts, to)) {
587 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
588 "same time", to, from);
589 return;
590 }
591 }
592
593 /* rename all items in opts */
594 while ((value = qemu_opt_get(opts, from))) {
595 qemu_opt_set(opts, to, value);
596 qemu_opt_unset(opts, from);
597 }
598 }
599
600 QemuOptsList qemu_legacy_drive_opts = {
601 .name = "drive",
602 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
603 .desc = {
604 {
605 .name = "bus",
606 .type = QEMU_OPT_NUMBER,
607 .help = "bus number",
608 },{
609 .name = "unit",
610 .type = QEMU_OPT_NUMBER,
611 .help = "unit number (i.e. lun for scsi)",
612 },{
613 .name = "index",
614 .type = QEMU_OPT_NUMBER,
615 .help = "index number",
616 },{
617 .name = "media",
618 .type = QEMU_OPT_STRING,
619 .help = "media type (disk, cdrom)",
620 },{
621 .name = "if",
622 .type = QEMU_OPT_STRING,
623 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
624 },{
625 .name = "cyls",
626 .type = QEMU_OPT_NUMBER,
627 .help = "number of cylinders (ide disk geometry)",
628 },{
629 .name = "heads",
630 .type = QEMU_OPT_NUMBER,
631 .help = "number of heads (ide disk geometry)",
632 },{
633 .name = "secs",
634 .type = QEMU_OPT_NUMBER,
635 .help = "number of sectors (ide disk geometry)",
636 },{
637 .name = "trans",
638 .type = QEMU_OPT_STRING,
639 .help = "chs translation (auto, lba, none)",
640 },{
641 .name = "boot",
642 .type = QEMU_OPT_BOOL,
643 .help = "(deprecated, ignored)",
644 },{
645 .name = "addr",
646 .type = QEMU_OPT_STRING,
647 .help = "pci address (virtio only)",
648 },{
649 .name = "serial",
650 .type = QEMU_OPT_STRING,
651 .help = "disk serial number",
652 },{
653 .name = "file",
654 .type = QEMU_OPT_STRING,
655 .help = "file name",
656 },
657
658 /* Options that are passed on, but have special semantics with -drive */
659 {
660 .name = "read-only",
661 .type = QEMU_OPT_BOOL,
662 .help = "open drive file as read-only",
663 },{
664 .name = "rerror",
665 .type = QEMU_OPT_STRING,
666 .help = "read error action",
667 },{
668 .name = "werror",
669 .type = QEMU_OPT_STRING,
670 .help = "write error action",
671 },{
672 .name = "copy-on-read",
673 .type = QEMU_OPT_BOOL,
674 .help = "copy read data from backing file into image file",
675 },
676
677 { /* end of list */ }
678 },
679 };
680
681 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
682 {
683 const char *value;
684 BlockBackend *blk;
685 DriveInfo *dinfo = NULL;
686 QDict *bs_opts;
687 QemuOpts *legacy_opts;
688 DriveMediaType media = MEDIA_DISK;
689 BlockInterfaceType type;
690 int cyls, heads, secs, translation;
691 int max_devs, bus_id, unit_id, index;
692 const char *devaddr;
693 const char *werror, *rerror;
694 bool read_only = false;
695 bool copy_on_read;
696 const char *serial;
697 const char *filename;
698 Error *local_err = NULL;
699 int i;
700
701 /* Change legacy command line options into QMP ones */
702 static const struct {
703 const char *from;
704 const char *to;
705 } opt_renames[] = {
706 { "iops", "throttling.iops-total" },
707 { "iops_rd", "throttling.iops-read" },
708 { "iops_wr", "throttling.iops-write" },
709
710 { "bps", "throttling.bps-total" },
711 { "bps_rd", "throttling.bps-read" },
712 { "bps_wr", "throttling.bps-write" },
713
714 { "iops_max", "throttling.iops-total-max" },
715 { "iops_rd_max", "throttling.iops-read-max" },
716 { "iops_wr_max", "throttling.iops-write-max" },
717
718 { "bps_max", "throttling.bps-total-max" },
719 { "bps_rd_max", "throttling.bps-read-max" },
720 { "bps_wr_max", "throttling.bps-write-max" },
721
722 { "iops_size", "throttling.iops-size" },
723
724 { "readonly", "read-only" },
725 };
726
727 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
728 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
729 &local_err);
730 if (local_err) {
731 error_report("%s", error_get_pretty(local_err));
732 error_free(local_err);
733 return NULL;
734 }
735 }
736
737 value = qemu_opt_get(all_opts, "cache");
738 if (value) {
739 int flags = 0;
740
741 if (bdrv_parse_cache_flags(value, &flags) != 0) {
742 error_report("invalid cache option");
743 return NULL;
744 }
745
746 /* Specific options take precedence */
747 if (!qemu_opt_get(all_opts, "cache.writeback")) {
748 qemu_opt_set_bool(all_opts, "cache.writeback",
749 !!(flags & BDRV_O_CACHE_WB));
750 }
751 if (!qemu_opt_get(all_opts, "cache.direct")) {
752 qemu_opt_set_bool(all_opts, "cache.direct",
753 !!(flags & BDRV_O_NOCACHE));
754 }
755 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
756 qemu_opt_set_bool(all_opts, "cache.no-flush",
757 !!(flags & BDRV_O_NO_FLUSH));
758 }
759 qemu_opt_unset(all_opts, "cache");
760 }
761
762 /* Get a QDict for processing the options */
763 bs_opts = qdict_new();
764 qemu_opts_to_qdict(all_opts, bs_opts);
765
766 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
767 &error_abort);
768 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
769 if (local_err) {
770 error_report("%s", error_get_pretty(local_err));
771 error_free(local_err);
772 goto fail;
773 }
774
775 /* Deprecated option boot=[on|off] */
776 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
777 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
778 "ignored. Future versions will reject this parameter. Please "
779 "update your scripts.\n");
780 }
781
782 /* Media type */
783 value = qemu_opt_get(legacy_opts, "media");
784 if (value) {
785 if (!strcmp(value, "disk")) {
786 media = MEDIA_DISK;
787 } else if (!strcmp(value, "cdrom")) {
788 media = MEDIA_CDROM;
789 read_only = true;
790 } else {
791 error_report("'%s' invalid media", value);
792 goto fail;
793 }
794 }
795
796 /* copy-on-read is disabled with a warning for read-only devices */
797 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
798 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
799
800 if (read_only && copy_on_read) {
801 error_report("warning: disabling copy-on-read on read-only drive");
802 copy_on_read = false;
803 }
804
805 qdict_put(bs_opts, "read-only",
806 qstring_from_str(read_only ? "on" : "off"));
807 qdict_put(bs_opts, "copy-on-read",
808 qstring_from_str(copy_on_read ? "on" :"off"));
809
810 /* Controller type */
811 value = qemu_opt_get(legacy_opts, "if");
812 if (value) {
813 for (type = 0;
814 type < IF_COUNT && strcmp(value, if_name[type]);
815 type++) {
816 }
817 if (type == IF_COUNT) {
818 error_report("unsupported bus type '%s'", value);
819 goto fail;
820 }
821 } else {
822 type = block_default_type;
823 }
824
825 /* Geometry */
826 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
827 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
828 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
829
830 if (cyls || heads || secs) {
831 if (cyls < 1) {
832 error_report("invalid physical cyls number");
833 goto fail;
834 }
835 if (heads < 1) {
836 error_report("invalid physical heads number");
837 goto fail;
838 }
839 if (secs < 1) {
840 error_report("invalid physical secs number");
841 goto fail;
842 }
843 }
844
845 translation = BIOS_ATA_TRANSLATION_AUTO;
846 value = qemu_opt_get(legacy_opts, "trans");
847 if (value != NULL) {
848 if (!cyls) {
849 error_report("'%s' trans must be used with cyls, heads and secs",
850 value);
851 goto fail;
852 }
853 if (!strcmp(value, "none")) {
854 translation = BIOS_ATA_TRANSLATION_NONE;
855 } else if (!strcmp(value, "lba")) {
856 translation = BIOS_ATA_TRANSLATION_LBA;
857 } else if (!strcmp(value, "large")) {
858 translation = BIOS_ATA_TRANSLATION_LARGE;
859 } else if (!strcmp(value, "rechs")) {
860 translation = BIOS_ATA_TRANSLATION_RECHS;
861 } else if (!strcmp(value, "auto")) {
862 translation = BIOS_ATA_TRANSLATION_AUTO;
863 } else {
864 error_report("'%s' invalid translation type", value);
865 goto fail;
866 }
867 }
868
869 if (media == MEDIA_CDROM) {
870 if (cyls || secs || heads) {
871 error_report("CHS can't be set with media=cdrom");
872 goto fail;
873 }
874 }
875
876 /* Device address specified by bus/unit or index.
877 * If none was specified, try to find the first free one. */
878 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
879 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
880 index = qemu_opt_get_number(legacy_opts, "index", -1);
881
882 max_devs = if_max_devs[type];
883
884 if (index != -1) {
885 if (bus_id != 0 || unit_id != -1) {
886 error_report("index cannot be used with bus and unit");
887 goto fail;
888 }
889 bus_id = drive_index_to_bus_id(type, index);
890 unit_id = drive_index_to_unit_id(type, index);
891 }
892
893 if (unit_id == -1) {
894 unit_id = 0;
895 while (drive_get(type, bus_id, unit_id) != NULL) {
896 unit_id++;
897 if (max_devs && unit_id >= max_devs) {
898 unit_id -= max_devs;
899 bus_id++;
900 }
901 }
902 }
903
904 if (max_devs && unit_id >= max_devs) {
905 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
906 goto fail;
907 }
908
909 if (drive_get(type, bus_id, unit_id) != NULL) {
910 error_report("drive with bus=%d, unit=%d (index=%d) exists",
911 bus_id, unit_id, index);
912 goto fail;
913 }
914
915 /* Serial number */
916 serial = qemu_opt_get(legacy_opts, "serial");
917
918 /* no id supplied -> create one */
919 if (qemu_opts_id(all_opts) == NULL) {
920 char *new_id;
921 const char *mediastr = "";
922 if (type == IF_IDE || type == IF_SCSI) {
923 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
924 }
925 if (max_devs) {
926 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
927 mediastr, unit_id);
928 } else {
929 new_id = g_strdup_printf("%s%s%i", if_name[type],
930 mediastr, unit_id);
931 }
932 qdict_put(bs_opts, "id", qstring_from_str(new_id));
933 g_free(new_id);
934 }
935
936 /* Add virtio block device */
937 devaddr = qemu_opt_get(legacy_opts, "addr");
938 if (devaddr && type != IF_VIRTIO) {
939 error_report("addr is not supported by this bus type");
940 goto fail;
941 }
942
943 if (type == IF_VIRTIO) {
944 QemuOpts *devopts;
945 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
946 &error_abort);
947 if (arch_type == QEMU_ARCH_S390X) {
948 qemu_opt_set(devopts, "driver", "virtio-blk-s390");
949 } else {
950 qemu_opt_set(devopts, "driver", "virtio-blk-pci");
951 }
952 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"));
953 if (devaddr) {
954 qemu_opt_set(devopts, "addr", devaddr);
955 }
956 }
957
958 filename = qemu_opt_get(legacy_opts, "file");
959
960 /* Check werror/rerror compatibility with if=... */
961 werror = qemu_opt_get(legacy_opts, "werror");
962 if (werror != NULL) {
963 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
964 type != IF_NONE) {
965 error_report("werror is not supported by this bus type");
966 goto fail;
967 }
968 qdict_put(bs_opts, "werror", qstring_from_str(werror));
969 }
970
971 rerror = qemu_opt_get(legacy_opts, "rerror");
972 if (rerror != NULL) {
973 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
974 type != IF_NONE) {
975 error_report("rerror is not supported by this bus type");
976 goto fail;
977 }
978 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
979 }
980
981 /* Actual block device init: Functionality shared with blockdev-add */
982 blk = blockdev_init(filename, bs_opts, &local_err);
983 bs_opts = NULL;
984 if (!blk) {
985 if (local_err) {
986 error_report("%s", error_get_pretty(local_err));
987 error_free(local_err);
988 }
989 goto fail;
990 } else {
991 assert(!local_err);
992 }
993
994 /* Create legacy DriveInfo */
995 dinfo = g_malloc0(sizeof(*dinfo));
996 dinfo->opts = all_opts;
997
998 dinfo->cyls = cyls;
999 dinfo->heads = heads;
1000 dinfo->secs = secs;
1001 dinfo->trans = translation;
1002
1003 dinfo->type = type;
1004 dinfo->bus = bus_id;
1005 dinfo->unit = unit_id;
1006 dinfo->devaddr = devaddr;
1007 dinfo->serial = g_strdup(serial);
1008
1009 blk_set_legacy_dinfo(blk, dinfo);
1010
1011 switch(type) {
1012 case IF_IDE:
1013 case IF_SCSI:
1014 case IF_XEN:
1015 case IF_NONE:
1016 dinfo->media_cd = media == MEDIA_CDROM;
1017 break;
1018 default:
1019 break;
1020 }
1021
1022 fail:
1023 qemu_opts_del(legacy_opts);
1024 QDECREF(bs_opts);
1025 return dinfo;
1026 }
1027
1028 void do_commit(Monitor *mon, const QDict *qdict)
1029 {
1030 const char *device = qdict_get_str(qdict, "device");
1031 BlockDriverState *bs;
1032 int ret;
1033
1034 if (!strcmp(device, "all")) {
1035 ret = bdrv_commit_all();
1036 } else {
1037 bs = bdrv_find(device);
1038 if (!bs) {
1039 monitor_printf(mon, "Device '%s' not found\n", device);
1040 return;
1041 }
1042 ret = bdrv_commit(bs);
1043 }
1044 if (ret < 0) {
1045 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1046 strerror(-ret));
1047 }
1048 }
1049
1050 static void blockdev_do_action(int kind, void *data, Error **errp)
1051 {
1052 TransactionAction action;
1053 TransactionActionList list;
1054
1055 action.kind = kind;
1056 action.data = data;
1057 list.value = &action;
1058 list.next = NULL;
1059 qmp_transaction(&list, errp);
1060 }
1061
1062 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1063 bool has_node_name, const char *node_name,
1064 const char *snapshot_file,
1065 bool has_snapshot_node_name,
1066 const char *snapshot_node_name,
1067 bool has_format, const char *format,
1068 bool has_mode, NewImageMode mode, Error **errp)
1069 {
1070 BlockdevSnapshot snapshot = {
1071 .has_device = has_device,
1072 .device = (char *) device,
1073 .has_node_name = has_node_name,
1074 .node_name = (char *) node_name,
1075 .snapshot_file = (char *) snapshot_file,
1076 .has_snapshot_node_name = has_snapshot_node_name,
1077 .snapshot_node_name = (char *) snapshot_node_name,
1078 .has_format = has_format,
1079 .format = (char *) format,
1080 .has_mode = has_mode,
1081 .mode = mode,
1082 };
1083 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1084 &snapshot, errp);
1085 }
1086
1087 void qmp_blockdev_snapshot_internal_sync(const char *device,
1088 const char *name,
1089 Error **errp)
1090 {
1091 BlockdevSnapshotInternal snapshot = {
1092 .device = (char *) device,
1093 .name = (char *) name
1094 };
1095
1096 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1097 &snapshot, errp);
1098 }
1099
1100 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1101 bool has_id,
1102 const char *id,
1103 bool has_name,
1104 const char *name,
1105 Error **errp)
1106 {
1107 BlockDriverState *bs = bdrv_find(device);
1108 AioContext *aio_context;
1109 QEMUSnapshotInfo sn;
1110 Error *local_err = NULL;
1111 SnapshotInfo *info = NULL;
1112 int ret;
1113
1114 if (!bs) {
1115 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1116 return NULL;
1117 }
1118
1119 if (!has_id) {
1120 id = NULL;
1121 }
1122
1123 if (!has_name) {
1124 name = NULL;
1125 }
1126
1127 if (!id && !name) {
1128 error_setg(errp, "Name or id must be provided");
1129 return NULL;
1130 }
1131
1132 aio_context = bdrv_get_aio_context(bs);
1133 aio_context_acquire(aio_context);
1134
1135 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1136 goto out_aio_context;
1137 }
1138
1139 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1140 if (local_err) {
1141 error_propagate(errp, local_err);
1142 goto out_aio_context;
1143 }
1144 if (!ret) {
1145 error_setg(errp,
1146 "Snapshot with id '%s' and name '%s' does not exist on "
1147 "device '%s'",
1148 STR_OR_NULL(id), STR_OR_NULL(name), device);
1149 goto out_aio_context;
1150 }
1151
1152 bdrv_snapshot_delete(bs, id, name, &local_err);
1153 if (local_err) {
1154 error_propagate(errp, local_err);
1155 goto out_aio_context;
1156 }
1157
1158 aio_context_release(aio_context);
1159
1160 info = g_new0(SnapshotInfo, 1);
1161 info->id = g_strdup(sn.id_str);
1162 info->name = g_strdup(sn.name);
1163 info->date_nsec = sn.date_nsec;
1164 info->date_sec = sn.date_sec;
1165 info->vm_state_size = sn.vm_state_size;
1166 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1167 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1168
1169 return info;
1170
1171 out_aio_context:
1172 aio_context_release(aio_context);
1173 return NULL;
1174 }
1175
1176 /* New and old BlockDriverState structs for group snapshots */
1177
1178 typedef struct BlkTransactionState BlkTransactionState;
1179
1180 /* Only prepare() may fail. In a single transaction, only one of commit() or
1181 abort() will be called, clean() will always be called if it present. */
1182 typedef struct BdrvActionOps {
1183 /* Size of state struct, in bytes. */
1184 size_t instance_size;
1185 /* Prepare the work, must NOT be NULL. */
1186 void (*prepare)(BlkTransactionState *common, Error **errp);
1187 /* Commit the changes, can be NULL. */
1188 void (*commit)(BlkTransactionState *common);
1189 /* Abort the changes on fail, can be NULL. */
1190 void (*abort)(BlkTransactionState *common);
1191 /* Clean up resource in the end, can be NULL. */
1192 void (*clean)(BlkTransactionState *common);
1193 } BdrvActionOps;
1194
1195 /*
1196 * This structure must be arranged as first member in child type, assuming
1197 * that compiler will also arrange it to the same address with parent instance.
1198 * Later it will be used in free().
1199 */
1200 struct BlkTransactionState {
1201 TransactionAction *action;
1202 const BdrvActionOps *ops;
1203 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1204 };
1205
1206 /* internal snapshot private data */
1207 typedef struct InternalSnapshotState {
1208 BlkTransactionState common;
1209 BlockDriverState *bs;
1210 QEMUSnapshotInfo sn;
1211 } InternalSnapshotState;
1212
1213 static void internal_snapshot_prepare(BlkTransactionState *common,
1214 Error **errp)
1215 {
1216 Error *local_err = NULL;
1217 const char *device;
1218 const char *name;
1219 BlockDriverState *bs;
1220 QEMUSnapshotInfo old_sn, *sn;
1221 bool ret;
1222 qemu_timeval tv;
1223 BlockdevSnapshotInternal *internal;
1224 InternalSnapshotState *state;
1225 int ret1;
1226
1227 g_assert(common->action->kind ==
1228 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1229 internal = common->action->blockdev_snapshot_internal_sync;
1230 state = DO_UPCAST(InternalSnapshotState, common, common);
1231
1232 /* 1. parse input */
1233 device = internal->device;
1234 name = internal->name;
1235
1236 /* 2. check for validation */
1237 bs = bdrv_find(device);
1238 if (!bs) {
1239 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1240 return;
1241 }
1242
1243 if (!bdrv_is_inserted(bs)) {
1244 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1245 return;
1246 }
1247
1248 if (bdrv_is_read_only(bs)) {
1249 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1250 return;
1251 }
1252
1253 if (!bdrv_can_snapshot(bs)) {
1254 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1255 bs->drv->format_name, device, "internal snapshot");
1256 return;
1257 }
1258
1259 if (!strlen(name)) {
1260 error_setg(errp, "Name is empty");
1261 return;
1262 }
1263
1264 /* check whether a snapshot with name exist */
1265 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1266 &local_err);
1267 if (local_err) {
1268 error_propagate(errp, local_err);
1269 return;
1270 } else if (ret) {
1271 error_setg(errp,
1272 "Snapshot with name '%s' already exists on device '%s'",
1273 name, device);
1274 return;
1275 }
1276
1277 /* 3. take the snapshot */
1278 sn = &state->sn;
1279 pstrcpy(sn->name, sizeof(sn->name), name);
1280 qemu_gettimeofday(&tv);
1281 sn->date_sec = tv.tv_sec;
1282 sn->date_nsec = tv.tv_usec * 1000;
1283 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1284
1285 ret1 = bdrv_snapshot_create(bs, sn);
1286 if (ret1 < 0) {
1287 error_setg_errno(errp, -ret1,
1288 "Failed to create snapshot '%s' on device '%s'",
1289 name, device);
1290 return;
1291 }
1292
1293 /* 4. succeed, mark a snapshot is created */
1294 state->bs = bs;
1295 }
1296
1297 static void internal_snapshot_abort(BlkTransactionState *common)
1298 {
1299 InternalSnapshotState *state =
1300 DO_UPCAST(InternalSnapshotState, common, common);
1301 BlockDriverState *bs = state->bs;
1302 QEMUSnapshotInfo *sn = &state->sn;
1303 Error *local_error = NULL;
1304
1305 if (!bs) {
1306 return;
1307 }
1308
1309 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1310 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1311 "device '%s' in abort: %s",
1312 sn->id_str,
1313 sn->name,
1314 bdrv_get_device_name(bs),
1315 error_get_pretty(local_error));
1316 error_free(local_error);
1317 }
1318 }
1319
1320 /* external snapshot private data */
1321 typedef struct ExternalSnapshotState {
1322 BlkTransactionState common;
1323 BlockDriverState *old_bs;
1324 BlockDriverState *new_bs;
1325 } ExternalSnapshotState;
1326
1327 static void external_snapshot_prepare(BlkTransactionState *common,
1328 Error **errp)
1329 {
1330 BlockDriver *drv;
1331 int flags, ret;
1332 QDict *options = NULL;
1333 Error *local_err = NULL;
1334 bool has_device = false;
1335 const char *device;
1336 bool has_node_name = false;
1337 const char *node_name;
1338 bool has_snapshot_node_name = false;
1339 const char *snapshot_node_name;
1340 const char *new_image_file;
1341 const char *format = "qcow2";
1342 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1343 ExternalSnapshotState *state =
1344 DO_UPCAST(ExternalSnapshotState, common, common);
1345 TransactionAction *action = common->action;
1346
1347 /* get parameters */
1348 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1349
1350 has_device = action->blockdev_snapshot_sync->has_device;
1351 device = action->blockdev_snapshot_sync->device;
1352 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1353 node_name = action->blockdev_snapshot_sync->node_name;
1354 has_snapshot_node_name =
1355 action->blockdev_snapshot_sync->has_snapshot_node_name;
1356 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1357
1358 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1359 if (action->blockdev_snapshot_sync->has_format) {
1360 format = action->blockdev_snapshot_sync->format;
1361 }
1362 if (action->blockdev_snapshot_sync->has_mode) {
1363 mode = action->blockdev_snapshot_sync->mode;
1364 }
1365
1366 /* start processing */
1367 drv = bdrv_find_format(format);
1368 if (!drv) {
1369 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1370 return;
1371 }
1372
1373 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1374 has_node_name ? node_name : NULL,
1375 &local_err);
1376 if (local_err) {
1377 error_propagate(errp, local_err);
1378 return;
1379 }
1380
1381 if (has_node_name && !has_snapshot_node_name) {
1382 error_setg(errp, "New snapshot node name missing");
1383 return;
1384 }
1385
1386 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1387 error_setg(errp, "New snapshot node name already existing");
1388 return;
1389 }
1390
1391 if (!bdrv_is_inserted(state->old_bs)) {
1392 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1393 return;
1394 }
1395
1396 if (bdrv_op_is_blocked(state->old_bs,
1397 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1398 return;
1399 }
1400
1401 if (!bdrv_is_read_only(state->old_bs)) {
1402 if (bdrv_flush(state->old_bs)) {
1403 error_set(errp, QERR_IO_ERROR);
1404 return;
1405 }
1406 }
1407
1408 if (!bdrv_is_first_non_filter(state->old_bs)) {
1409 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1410 return;
1411 }
1412
1413 flags = state->old_bs->open_flags;
1414
1415 /* create new image w/backing file */
1416 if (mode != NEW_IMAGE_MODE_EXISTING) {
1417 bdrv_img_create(new_image_file, format,
1418 state->old_bs->filename,
1419 state->old_bs->drv->format_name,
1420 NULL, -1, flags, &local_err, false);
1421 if (local_err) {
1422 error_propagate(errp, local_err);
1423 return;
1424 }
1425 }
1426
1427 if (has_snapshot_node_name) {
1428 options = qdict_new();
1429 qdict_put(options, "node-name",
1430 qstring_from_str(snapshot_node_name));
1431 }
1432
1433 /* TODO Inherit bs->options or only take explicit options with an
1434 * extended QMP command? */
1435 assert(state->new_bs == NULL);
1436 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1437 flags | BDRV_O_NO_BACKING, drv, &local_err);
1438 /* We will manually add the backing_hd field to the bs later */
1439 if (ret != 0) {
1440 error_propagate(errp, local_err);
1441 }
1442 }
1443
1444 static void external_snapshot_commit(BlkTransactionState *common)
1445 {
1446 ExternalSnapshotState *state =
1447 DO_UPCAST(ExternalSnapshotState, common, common);
1448
1449 /* This removes our old bs and adds the new bs */
1450 bdrv_append(state->new_bs, state->old_bs);
1451 /* We don't need (or want) to use the transactional
1452 * bdrv_reopen_multiple() across all the entries at once, because we
1453 * don't want to abort all of them if one of them fails the reopen */
1454 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1455 NULL);
1456 }
1457
1458 static void external_snapshot_abort(BlkTransactionState *common)
1459 {
1460 ExternalSnapshotState *state =
1461 DO_UPCAST(ExternalSnapshotState, common, common);
1462 if (state->new_bs) {
1463 bdrv_unref(state->new_bs);
1464 }
1465 }
1466
1467 typedef struct DriveBackupState {
1468 BlkTransactionState common;
1469 BlockDriverState *bs;
1470 BlockJob *job;
1471 } DriveBackupState;
1472
1473 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1474 {
1475 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1476 DriveBackup *backup;
1477 Error *local_err = NULL;
1478
1479 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1480 backup = common->action->drive_backup;
1481
1482 qmp_drive_backup(backup->device, backup->target,
1483 backup->has_format, backup->format,
1484 backup->sync,
1485 backup->has_mode, backup->mode,
1486 backup->has_speed, backup->speed,
1487 backup->has_on_source_error, backup->on_source_error,
1488 backup->has_on_target_error, backup->on_target_error,
1489 &local_err);
1490 if (local_err) {
1491 error_propagate(errp, local_err);
1492 state->bs = NULL;
1493 state->job = NULL;
1494 return;
1495 }
1496
1497 state->bs = bdrv_find(backup->device);
1498 state->job = state->bs->job;
1499 }
1500
1501 static void drive_backup_abort(BlkTransactionState *common)
1502 {
1503 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1504 BlockDriverState *bs = state->bs;
1505
1506 /* Only cancel if it's the job we started */
1507 if (bs && bs->job && bs->job == state->job) {
1508 block_job_cancel_sync(bs->job);
1509 }
1510 }
1511
1512 static void abort_prepare(BlkTransactionState *common, Error **errp)
1513 {
1514 error_setg(errp, "Transaction aborted using Abort action");
1515 }
1516
1517 static void abort_commit(BlkTransactionState *common)
1518 {
1519 g_assert_not_reached(); /* this action never succeeds */
1520 }
1521
1522 static const BdrvActionOps actions[] = {
1523 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1524 .instance_size = sizeof(ExternalSnapshotState),
1525 .prepare = external_snapshot_prepare,
1526 .commit = external_snapshot_commit,
1527 .abort = external_snapshot_abort,
1528 },
1529 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1530 .instance_size = sizeof(DriveBackupState),
1531 .prepare = drive_backup_prepare,
1532 .abort = drive_backup_abort,
1533 },
1534 [TRANSACTION_ACTION_KIND_ABORT] = {
1535 .instance_size = sizeof(BlkTransactionState),
1536 .prepare = abort_prepare,
1537 .commit = abort_commit,
1538 },
1539 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1540 .instance_size = sizeof(InternalSnapshotState),
1541 .prepare = internal_snapshot_prepare,
1542 .abort = internal_snapshot_abort,
1543 },
1544 };
1545
1546 /*
1547 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1548 * then we do not pivot any of the devices in the group, and abandon the
1549 * snapshots
1550 */
1551 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1552 {
1553 TransactionActionList *dev_entry = dev_list;
1554 BlkTransactionState *state, *next;
1555 Error *local_err = NULL;
1556
1557 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1558 QSIMPLEQ_INIT(&snap_bdrv_states);
1559
1560 /* drain all i/o before any snapshots */
1561 bdrv_drain_all();
1562
1563 /* We don't do anything in this loop that commits us to the snapshot */
1564 while (NULL != dev_entry) {
1565 TransactionAction *dev_info = NULL;
1566 const BdrvActionOps *ops;
1567
1568 dev_info = dev_entry->value;
1569 dev_entry = dev_entry->next;
1570
1571 assert(dev_info->kind < ARRAY_SIZE(actions));
1572
1573 ops = &actions[dev_info->kind];
1574 assert(ops->instance_size > 0);
1575
1576 state = g_malloc0(ops->instance_size);
1577 state->ops = ops;
1578 state->action = dev_info;
1579 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1580
1581 state->ops->prepare(state, &local_err);
1582 if (local_err) {
1583 error_propagate(errp, local_err);
1584 goto delete_and_fail;
1585 }
1586 }
1587
1588 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1589 if (state->ops->commit) {
1590 state->ops->commit(state);
1591 }
1592 }
1593
1594 /* success */
1595 goto exit;
1596
1597 delete_and_fail:
1598 /*
1599 * failure, and it is all-or-none; abandon each new bs, and keep using
1600 * the original bs for all images
1601 */
1602 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1603 if (state->ops->abort) {
1604 state->ops->abort(state);
1605 }
1606 }
1607 exit:
1608 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1609 if (state->ops->clean) {
1610 state->ops->clean(state);
1611 }
1612 g_free(state);
1613 }
1614 }
1615
1616
1617 static void eject_device(BlockBackend *blk, int force, Error **errp)
1618 {
1619 BlockDriverState *bs = blk_bs(blk);
1620 AioContext *aio_context;
1621
1622 aio_context = bdrv_get_aio_context(bs);
1623 aio_context_acquire(aio_context);
1624
1625 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1626 goto out;
1627 }
1628 if (!blk_dev_has_removable_media(blk)) {
1629 error_setg(errp, "Device '%s' is not removable",
1630 bdrv_get_device_name(bs));
1631 goto out;
1632 }
1633
1634 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1635 blk_dev_eject_request(blk, force);
1636 if (!force) {
1637 error_setg(errp, "Device '%s' is locked",
1638 bdrv_get_device_name(bs));
1639 goto out;
1640 }
1641 }
1642
1643 bdrv_close(bs);
1644
1645 out:
1646 aio_context_release(aio_context);
1647 }
1648
1649 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1650 {
1651 BlockBackend *blk;
1652
1653 blk = blk_by_name(device);
1654 if (!blk) {
1655 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1656 return;
1657 }
1658
1659 eject_device(blk, force, errp);
1660 }
1661
1662 void qmp_block_passwd(bool has_device, const char *device,
1663 bool has_node_name, const char *node_name,
1664 const char *password, Error **errp)
1665 {
1666 Error *local_err = NULL;
1667 BlockDriverState *bs;
1668 AioContext *aio_context;
1669 int err;
1670
1671 bs = bdrv_lookup_bs(has_device ? device : NULL,
1672 has_node_name ? node_name : NULL,
1673 &local_err);
1674 if (local_err) {
1675 error_propagate(errp, local_err);
1676 return;
1677 }
1678
1679 aio_context = bdrv_get_aio_context(bs);
1680 aio_context_acquire(aio_context);
1681
1682 err = bdrv_set_key(bs, password);
1683 if (err == -EINVAL) {
1684 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1685 goto out;
1686 } else if (err < 0) {
1687 error_set(errp, QERR_INVALID_PASSWORD);
1688 goto out;
1689 }
1690
1691 out:
1692 aio_context_release(aio_context);
1693 }
1694
1695 /* Assumes AioContext is held */
1696 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1697 int bdrv_flags, BlockDriver *drv,
1698 const char *password, Error **errp)
1699 {
1700 Error *local_err = NULL;
1701 int ret;
1702
1703 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
1704 if (ret < 0) {
1705 error_propagate(errp, local_err);
1706 return;
1707 }
1708
1709 if (bdrv_key_required(bs)) {
1710 if (password) {
1711 if (bdrv_set_key(bs, password) < 0) {
1712 error_set(errp, QERR_INVALID_PASSWORD);
1713 }
1714 } else {
1715 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1716 bdrv_get_encrypted_filename(bs));
1717 }
1718 } else if (password) {
1719 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1720 }
1721 }
1722
1723 void qmp_change_blockdev(const char *device, const char *filename,
1724 const char *format, Error **errp)
1725 {
1726 BlockBackend *blk;
1727 BlockDriverState *bs;
1728 AioContext *aio_context;
1729 BlockDriver *drv = NULL;
1730 int bdrv_flags;
1731 Error *err = NULL;
1732
1733 blk = blk_by_name(device);
1734 if (!blk) {
1735 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1736 return;
1737 }
1738 bs = blk_bs(blk);
1739
1740 aio_context = bdrv_get_aio_context(bs);
1741 aio_context_acquire(aio_context);
1742
1743 if (format) {
1744 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1745 if (!drv) {
1746 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1747 goto out;
1748 }
1749 }
1750
1751 eject_device(blk, 0, &err);
1752 if (err) {
1753 error_propagate(errp, err);
1754 goto out;
1755 }
1756
1757 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1758 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1759
1760 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1761
1762 out:
1763 aio_context_release(aio_context);
1764 }
1765
1766 /* throttling disk I/O limits */
1767 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1768 int64_t bps_wr,
1769 int64_t iops,
1770 int64_t iops_rd,
1771 int64_t iops_wr,
1772 bool has_bps_max,
1773 int64_t bps_max,
1774 bool has_bps_rd_max,
1775 int64_t bps_rd_max,
1776 bool has_bps_wr_max,
1777 int64_t bps_wr_max,
1778 bool has_iops_max,
1779 int64_t iops_max,
1780 bool has_iops_rd_max,
1781 int64_t iops_rd_max,
1782 bool has_iops_wr_max,
1783 int64_t iops_wr_max,
1784 bool has_iops_size,
1785 int64_t iops_size, Error **errp)
1786 {
1787 ThrottleConfig cfg;
1788 BlockDriverState *bs;
1789 AioContext *aio_context;
1790
1791 bs = bdrv_find(device);
1792 if (!bs) {
1793 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1794 return;
1795 }
1796
1797 memset(&cfg, 0, sizeof(cfg));
1798 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1799 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1800 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1801
1802 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1803 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1804 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1805
1806 if (has_bps_max) {
1807 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1808 }
1809 if (has_bps_rd_max) {
1810 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1811 }
1812 if (has_bps_wr_max) {
1813 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1814 }
1815 if (has_iops_max) {
1816 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1817 }
1818 if (has_iops_rd_max) {
1819 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1820 }
1821 if (has_iops_wr_max) {
1822 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1823 }
1824
1825 if (has_iops_size) {
1826 cfg.op_size = iops_size;
1827 }
1828
1829 if (!check_throttle_config(&cfg, errp)) {
1830 return;
1831 }
1832
1833 aio_context = bdrv_get_aio_context(bs);
1834 aio_context_acquire(aio_context);
1835
1836 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1837 bdrv_io_limits_enable(bs);
1838 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1839 bdrv_io_limits_disable(bs);
1840 }
1841
1842 if (bs->io_limits_enabled) {
1843 bdrv_set_io_limits(bs, &cfg);
1844 }
1845
1846 aio_context_release(aio_context);
1847 }
1848
1849 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1850 {
1851 const char *id = qdict_get_str(qdict, "id");
1852 BlockBackend *blk;
1853 BlockDriverState *bs;
1854 AioContext *aio_context;
1855 Error *local_err = NULL;
1856
1857 blk = blk_by_name(id);
1858 if (!blk) {
1859 error_report("Device '%s' not found", id);
1860 return -1;
1861 }
1862 bs = blk_bs(blk);
1863
1864 if (!blk_legacy_dinfo(blk)) {
1865 error_report("Deleting device added with blockdev-add"
1866 " is not supported");
1867 return -1;
1868 }
1869
1870 aio_context = bdrv_get_aio_context(bs);
1871 aio_context_acquire(aio_context);
1872
1873 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
1874 error_report("%s", error_get_pretty(local_err));
1875 error_free(local_err);
1876 aio_context_release(aio_context);
1877 return -1;
1878 }
1879
1880 /* quiesce block driver; prevent further io */
1881 bdrv_drain_all();
1882 bdrv_flush(bs);
1883 bdrv_close(bs);
1884
1885 /* if we have a device attached to this BlockDriverState
1886 * then we need to make the drive anonymous until the device
1887 * can be removed. If this is a drive with no device backing
1888 * then we can just get rid of the block driver state right here.
1889 */
1890 if (blk_get_attached_dev(blk)) {
1891 blk_hide_on_behalf_of_do_drive_del(blk);
1892 /* Further I/O must not pause the guest */
1893 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1894 BLOCKDEV_ON_ERROR_REPORT);
1895 } else {
1896 blk_unref(blk);
1897 }
1898
1899 aio_context_release(aio_context);
1900 return 0;
1901 }
1902
1903 void qmp_block_resize(bool has_device, const char *device,
1904 bool has_node_name, const char *node_name,
1905 int64_t size, Error **errp)
1906 {
1907 Error *local_err = NULL;
1908 BlockDriverState *bs;
1909 AioContext *aio_context;
1910 int ret;
1911
1912 bs = bdrv_lookup_bs(has_device ? device : NULL,
1913 has_node_name ? node_name : NULL,
1914 &local_err);
1915 if (local_err) {
1916 error_propagate(errp, local_err);
1917 return;
1918 }
1919
1920 aio_context = bdrv_get_aio_context(bs);
1921 aio_context_acquire(aio_context);
1922
1923 if (!bdrv_is_first_non_filter(bs)) {
1924 error_set(errp, QERR_FEATURE_DISABLED, "resize");
1925 goto out;
1926 }
1927
1928 if (size < 0) {
1929 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1930 goto out;
1931 }
1932
1933 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
1934 error_set(errp, QERR_DEVICE_IN_USE, device);
1935 goto out;
1936 }
1937
1938 /* complete all in-flight operations before resizing the device */
1939 bdrv_drain_all();
1940
1941 ret = bdrv_truncate(bs, size);
1942 switch (ret) {
1943 case 0:
1944 break;
1945 case -ENOMEDIUM:
1946 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1947 break;
1948 case -ENOTSUP:
1949 error_set(errp, QERR_UNSUPPORTED);
1950 break;
1951 case -EACCES:
1952 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1953 break;
1954 case -EBUSY:
1955 error_set(errp, QERR_DEVICE_IN_USE, device);
1956 break;
1957 default:
1958 error_setg_errno(errp, -ret, "Could not resize");
1959 break;
1960 }
1961
1962 out:
1963 aio_context_release(aio_context);
1964 }
1965
1966 static void block_job_cb(void *opaque, int ret)
1967 {
1968 /* Note that this function may be executed from another AioContext besides
1969 * the QEMU main loop. If you need to access anything that assumes the
1970 * QEMU global mutex, use a BH or introduce a mutex.
1971 */
1972
1973 BlockDriverState *bs = opaque;
1974 const char *msg = NULL;
1975
1976 trace_block_job_cb(bs, bs->job, ret);
1977
1978 assert(bs->job);
1979
1980 if (ret < 0) {
1981 msg = strerror(-ret);
1982 }
1983
1984 if (block_job_is_cancelled(bs->job)) {
1985 block_job_event_cancelled(bs->job);
1986 } else {
1987 block_job_event_completed(bs->job, msg);
1988 }
1989
1990 bdrv_put_ref_bh_schedule(bs);
1991 }
1992
1993 void qmp_block_stream(const char *device,
1994 bool has_base, const char *base,
1995 bool has_backing_file, const char *backing_file,
1996 bool has_speed, int64_t speed,
1997 bool has_on_error, BlockdevOnError on_error,
1998 Error **errp)
1999 {
2000 BlockDriverState *bs;
2001 BlockDriverState *base_bs = NULL;
2002 AioContext *aio_context;
2003 Error *local_err = NULL;
2004 const char *base_name = NULL;
2005
2006 if (!has_on_error) {
2007 on_error = BLOCKDEV_ON_ERROR_REPORT;
2008 }
2009
2010 bs = bdrv_find(device);
2011 if (!bs) {
2012 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2013 return;
2014 }
2015
2016 aio_context = bdrv_get_aio_context(bs);
2017 aio_context_acquire(aio_context);
2018
2019 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2020 goto out;
2021 }
2022
2023 if (has_base) {
2024 base_bs = bdrv_find_backing_image(bs, base);
2025 if (base_bs == NULL) {
2026 error_set(errp, QERR_BASE_NOT_FOUND, base);
2027 goto out;
2028 }
2029 assert(bdrv_get_aio_context(base_bs) == aio_context);
2030 base_name = base;
2031 }
2032
2033 /* if we are streaming the entire chain, the result will have no backing
2034 * file, and specifying one is therefore an error */
2035 if (base_bs == NULL && has_backing_file) {
2036 error_setg(errp, "backing file specified, but streaming the "
2037 "entire chain");
2038 goto out;
2039 }
2040
2041 /* backing_file string overrides base bs filename */
2042 base_name = has_backing_file ? backing_file : base_name;
2043
2044 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2045 on_error, block_job_cb, bs, &local_err);
2046 if (local_err) {
2047 error_propagate(errp, local_err);
2048 goto out;
2049 }
2050
2051 trace_qmp_block_stream(bs, bs->job);
2052
2053 out:
2054 aio_context_release(aio_context);
2055 }
2056
2057 void qmp_block_commit(const char *device,
2058 bool has_base, const char *base,
2059 bool has_top, const char *top,
2060 bool has_backing_file, const char *backing_file,
2061 bool has_speed, int64_t speed,
2062 Error **errp)
2063 {
2064 BlockDriverState *bs;
2065 BlockDriverState *base_bs, *top_bs;
2066 AioContext *aio_context;
2067 Error *local_err = NULL;
2068 /* This will be part of the QMP command, if/when the
2069 * BlockdevOnError change for blkmirror makes it in
2070 */
2071 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2072
2073 if (!has_speed) {
2074 speed = 0;
2075 }
2076
2077 /* Important Note:
2078 * libvirt relies on the DeviceNotFound error class in order to probe for
2079 * live commit feature versions; for this to work, we must make sure to
2080 * perform the device lookup before any generic errors that may occur in a
2081 * scenario in which all optional arguments are omitted. */
2082 bs = bdrv_find(device);
2083 if (!bs) {
2084 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2085 return;
2086 }
2087
2088 aio_context = bdrv_get_aio_context(bs);
2089 aio_context_acquire(aio_context);
2090
2091 /* drain all i/o before commits */
2092 bdrv_drain_all();
2093
2094 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, errp)) {
2095 goto out;
2096 }
2097
2098 /* default top_bs is the active layer */
2099 top_bs = bs;
2100
2101 if (has_top && top) {
2102 if (strcmp(bs->filename, top) != 0) {
2103 top_bs = bdrv_find_backing_image(bs, top);
2104 }
2105 }
2106
2107 if (top_bs == NULL) {
2108 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2109 goto out;
2110 }
2111
2112 assert(bdrv_get_aio_context(top_bs) == aio_context);
2113
2114 if (has_base && base) {
2115 base_bs = bdrv_find_backing_image(top_bs, base);
2116 } else {
2117 base_bs = bdrv_find_base(top_bs);
2118 }
2119
2120 if (base_bs == NULL) {
2121 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2122 goto out;
2123 }
2124
2125 assert(bdrv_get_aio_context(base_bs) == aio_context);
2126
2127 /* Do not allow attempts to commit an image into itself */
2128 if (top_bs == base_bs) {
2129 error_setg(errp, "cannot commit an image into itself");
2130 goto out;
2131 }
2132
2133 if (top_bs == bs) {
2134 if (has_backing_file) {
2135 error_setg(errp, "'backing-file' specified,"
2136 " but 'top' is the active layer");
2137 goto out;
2138 }
2139 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2140 bs, &local_err);
2141 } else {
2142 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2143 has_backing_file ? backing_file : NULL, &local_err);
2144 }
2145 if (local_err != NULL) {
2146 error_propagate(errp, local_err);
2147 goto out;
2148 }
2149
2150 out:
2151 aio_context_release(aio_context);
2152 }
2153
2154 void qmp_drive_backup(const char *device, const char *target,
2155 bool has_format, const char *format,
2156 enum MirrorSyncMode sync,
2157 bool has_mode, enum NewImageMode mode,
2158 bool has_speed, int64_t speed,
2159 bool has_on_source_error, BlockdevOnError on_source_error,
2160 bool has_on_target_error, BlockdevOnError on_target_error,
2161 Error **errp)
2162 {
2163 BlockDriverState *bs;
2164 BlockDriverState *target_bs;
2165 BlockDriverState *source = NULL;
2166 AioContext *aio_context;
2167 BlockDriver *drv = NULL;
2168 Error *local_err = NULL;
2169 int flags;
2170 int64_t size;
2171 int ret;
2172
2173 if (!has_speed) {
2174 speed = 0;
2175 }
2176 if (!has_on_source_error) {
2177 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2178 }
2179 if (!has_on_target_error) {
2180 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2181 }
2182 if (!has_mode) {
2183 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2184 }
2185
2186 bs = bdrv_find(device);
2187 if (!bs) {
2188 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2189 return;
2190 }
2191
2192 aio_context = bdrv_get_aio_context(bs);
2193 aio_context_acquire(aio_context);
2194
2195 if (!bdrv_is_inserted(bs)) {
2196 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2197 goto out;
2198 }
2199
2200 if (!has_format) {
2201 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2202 }
2203 if (format) {
2204 drv = bdrv_find_format(format);
2205 if (!drv) {
2206 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2207 goto out;
2208 }
2209 }
2210
2211 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2212 goto out;
2213 }
2214
2215 flags = bs->open_flags | BDRV_O_RDWR;
2216
2217 /* See if we have a backing HD we can use to create our new image
2218 * on top of. */
2219 if (sync == MIRROR_SYNC_MODE_TOP) {
2220 source = bs->backing_hd;
2221 if (!source) {
2222 sync = MIRROR_SYNC_MODE_FULL;
2223 }
2224 }
2225 if (sync == MIRROR_SYNC_MODE_NONE) {
2226 source = bs;
2227 }
2228
2229 size = bdrv_getlength(bs);
2230 if (size < 0) {
2231 error_setg_errno(errp, -size, "bdrv_getlength failed");
2232 goto out;
2233 }
2234
2235 if (mode != NEW_IMAGE_MODE_EXISTING) {
2236 assert(format && drv);
2237 if (source) {
2238 bdrv_img_create(target, format, source->filename,
2239 source->drv->format_name, NULL,
2240 size, flags, &local_err, false);
2241 } else {
2242 bdrv_img_create(target, format, NULL, NULL, NULL,
2243 size, flags, &local_err, false);
2244 }
2245 }
2246
2247 if (local_err) {
2248 error_propagate(errp, local_err);
2249 goto out;
2250 }
2251
2252 target_bs = NULL;
2253 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
2254 if (ret < 0) {
2255 error_propagate(errp, local_err);
2256 goto out;
2257 }
2258
2259 bdrv_set_aio_context(target_bs, aio_context);
2260
2261 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
2262 block_job_cb, bs, &local_err);
2263 if (local_err != NULL) {
2264 bdrv_unref(target_bs);
2265 error_propagate(errp, local_err);
2266 goto out;
2267 }
2268
2269 out:
2270 aio_context_release(aio_context);
2271 }
2272
2273 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2274 {
2275 return bdrv_named_nodes_list();
2276 }
2277
2278 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
2279
2280 void qmp_drive_mirror(const char *device, const char *target,
2281 bool has_format, const char *format,
2282 bool has_node_name, const char *node_name,
2283 bool has_replaces, const char *replaces,
2284 enum MirrorSyncMode sync,
2285 bool has_mode, enum NewImageMode mode,
2286 bool has_speed, int64_t speed,
2287 bool has_granularity, uint32_t granularity,
2288 bool has_buf_size, int64_t buf_size,
2289 bool has_on_source_error, BlockdevOnError on_source_error,
2290 bool has_on_target_error, BlockdevOnError on_target_error,
2291 Error **errp)
2292 {
2293 BlockDriverState *bs;
2294 BlockDriverState *source, *target_bs;
2295 AioContext *aio_context;
2296 BlockDriver *drv = NULL;
2297 Error *local_err = NULL;
2298 QDict *options = NULL;
2299 int flags;
2300 int64_t size;
2301 int ret;
2302
2303 if (!has_speed) {
2304 speed = 0;
2305 }
2306 if (!has_on_source_error) {
2307 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2308 }
2309 if (!has_on_target_error) {
2310 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2311 }
2312 if (!has_mode) {
2313 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2314 }
2315 if (!has_granularity) {
2316 granularity = 0;
2317 }
2318 if (!has_buf_size) {
2319 buf_size = DEFAULT_MIRROR_BUF_SIZE;
2320 }
2321
2322 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2323 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2324 "a value in range [512B, 64MB]");
2325 return;
2326 }
2327 if (granularity & (granularity - 1)) {
2328 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2");
2329 return;
2330 }
2331
2332 bs = bdrv_find(device);
2333 if (!bs) {
2334 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2335 return;
2336 }
2337
2338 aio_context = bdrv_get_aio_context(bs);
2339 aio_context_acquire(aio_context);
2340
2341 if (!bdrv_is_inserted(bs)) {
2342 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2343 goto out;
2344 }
2345
2346 if (!has_format) {
2347 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2348 }
2349 if (format) {
2350 drv = bdrv_find_format(format);
2351 if (!drv) {
2352 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2353 goto out;
2354 }
2355 }
2356
2357 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2358 goto out;
2359 }
2360
2361 flags = bs->open_flags | BDRV_O_RDWR;
2362 source = bs->backing_hd;
2363 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2364 sync = MIRROR_SYNC_MODE_FULL;
2365 }
2366 if (sync == MIRROR_SYNC_MODE_NONE) {
2367 source = bs;
2368 }
2369
2370 size = bdrv_getlength(bs);
2371 if (size < 0) {
2372 error_setg_errno(errp, -size, "bdrv_getlength failed");
2373 goto out;
2374 }
2375
2376 if (has_replaces) {
2377 BlockDriverState *to_replace_bs;
2378 AioContext *replace_aio_context;
2379 int64_t replace_size;
2380
2381 if (!has_node_name) {
2382 error_setg(errp, "a node-name must be provided when replacing a"
2383 " named node of the graph");
2384 goto out;
2385 }
2386
2387 to_replace_bs = check_to_replace_node(replaces, &local_err);
2388
2389 if (!to_replace_bs) {
2390 error_propagate(errp, local_err);
2391 goto out;
2392 }
2393
2394 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2395 aio_context_acquire(replace_aio_context);
2396 replace_size = bdrv_getlength(to_replace_bs);
2397 aio_context_release(replace_aio_context);
2398
2399 if (size != replace_size) {
2400 error_setg(errp, "cannot replace image with a mirror image of "
2401 "different size");
2402 goto out;
2403 }
2404 }
2405
2406 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2407 && mode != NEW_IMAGE_MODE_EXISTING)
2408 {
2409 /* create new image w/o backing file */
2410 assert(format && drv);
2411 bdrv_img_create(target, format,
2412 NULL, NULL, NULL, size, flags, &local_err, false);
2413 } else {
2414 switch (mode) {
2415 case NEW_IMAGE_MODE_EXISTING:
2416 break;
2417 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2418 /* create new image with backing file */
2419 bdrv_img_create(target, format,
2420 source->filename,
2421 source->drv->format_name,
2422 NULL, size, flags, &local_err, false);
2423 break;
2424 default:
2425 abort();
2426 }
2427 }
2428
2429 if (local_err) {
2430 error_propagate(errp, local_err);
2431 goto out;
2432 }
2433
2434 if (has_node_name) {
2435 options = qdict_new();
2436 qdict_put(options, "node-name", qstring_from_str(node_name));
2437 }
2438
2439 /* Mirroring takes care of copy-on-write using the source's backing
2440 * file.
2441 */
2442 target_bs = NULL;
2443 ret = bdrv_open(&target_bs, target, NULL, options,
2444 flags | BDRV_O_NO_BACKING, drv, &local_err);
2445 if (ret < 0) {
2446 error_propagate(errp, local_err);
2447 goto out;
2448 }
2449
2450 bdrv_set_aio_context(target_bs, aio_context);
2451
2452 /* pass the node name to replace to mirror start since it's loose coupling
2453 * and will allow to check whether the node still exist at mirror completion
2454 */
2455 mirror_start(bs, target_bs,
2456 has_replaces ? replaces : NULL,
2457 speed, granularity, buf_size, sync,
2458 on_source_error, on_target_error,
2459 block_job_cb, bs, &local_err);
2460 if (local_err != NULL) {
2461 bdrv_unref(target_bs);
2462 error_propagate(errp, local_err);
2463 goto out;
2464 }
2465
2466 out:
2467 aio_context_release(aio_context);
2468 }
2469
2470 /* Get the block job for a given device name and acquire its AioContext */
2471 static BlockJob *find_block_job(const char *device, AioContext **aio_context)
2472 {
2473 BlockDriverState *bs;
2474
2475 bs = bdrv_find(device);
2476 if (!bs) {
2477 goto notfound;
2478 }
2479
2480 *aio_context = bdrv_get_aio_context(bs);
2481 aio_context_acquire(*aio_context);
2482
2483 if (!bs->job) {
2484 aio_context_release(*aio_context);
2485 goto notfound;
2486 }
2487
2488 return bs->job;
2489
2490 notfound:
2491 *aio_context = NULL;
2492 return NULL;
2493 }
2494
2495 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2496 {
2497 AioContext *aio_context;
2498 BlockJob *job = find_block_job(device, &aio_context);
2499
2500 if (!job) {
2501 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2502 return;
2503 }
2504
2505 block_job_set_speed(job, speed, errp);
2506 aio_context_release(aio_context);
2507 }
2508
2509 void qmp_block_job_cancel(const char *device,
2510 bool has_force, bool force, Error **errp)
2511 {
2512 AioContext *aio_context;
2513 BlockJob *job = find_block_job(device, &aio_context);
2514
2515 if (!job) {
2516 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2517 return;
2518 }
2519
2520 if (!has_force) {
2521 force = false;
2522 }
2523
2524 if (job->paused && !force) {
2525 error_setg(errp, "The block job for device '%s' is currently paused",
2526 device);
2527 goto out;
2528 }
2529
2530 trace_qmp_block_job_cancel(job);
2531 block_job_cancel(job);
2532 out:
2533 aio_context_release(aio_context);
2534 }
2535
2536 void qmp_block_job_pause(const char *device, Error **errp)
2537 {
2538 AioContext *aio_context;
2539 BlockJob *job = find_block_job(device, &aio_context);
2540
2541 if (!job) {
2542 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2543 return;
2544 }
2545
2546 trace_qmp_block_job_pause(job);
2547 block_job_pause(job);
2548 aio_context_release(aio_context);
2549 }
2550
2551 void qmp_block_job_resume(const char *device, Error **errp)
2552 {
2553 AioContext *aio_context;
2554 BlockJob *job = find_block_job(device, &aio_context);
2555
2556 if (!job) {
2557 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2558 return;
2559 }
2560
2561 trace_qmp_block_job_resume(job);
2562 block_job_resume(job);
2563 aio_context_release(aio_context);
2564 }
2565
2566 void qmp_block_job_complete(const char *device, Error **errp)
2567 {
2568 AioContext *aio_context;
2569 BlockJob *job = find_block_job(device, &aio_context);
2570
2571 if (!job) {
2572 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2573 return;
2574 }
2575
2576 trace_qmp_block_job_complete(job);
2577 block_job_complete(job, errp);
2578 aio_context_release(aio_context);
2579 }
2580
2581 void qmp_change_backing_file(const char *device,
2582 const char *image_node_name,
2583 const char *backing_file,
2584 Error **errp)
2585 {
2586 BlockDriverState *bs = NULL;
2587 AioContext *aio_context;
2588 BlockDriverState *image_bs = NULL;
2589 Error *local_err = NULL;
2590 bool ro;
2591 int open_flags;
2592 int ret;
2593
2594 /* find the top layer BDS of the chain */
2595 bs = bdrv_find(device);
2596 if (!bs) {
2597 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2598 return;
2599 }
2600
2601 aio_context = bdrv_get_aio_context(bs);
2602 aio_context_acquire(aio_context);
2603
2604 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
2605 if (local_err) {
2606 error_propagate(errp, local_err);
2607 goto out;
2608 }
2609
2610 if (!image_bs) {
2611 error_setg(errp, "image file not found");
2612 goto out;
2613 }
2614
2615 if (bdrv_find_base(image_bs) == image_bs) {
2616 error_setg(errp, "not allowing backing file change on an image "
2617 "without a backing file");
2618 goto out;
2619 }
2620
2621 /* even though we are not necessarily operating on bs, we need it to
2622 * determine if block ops are currently prohibited on the chain */
2623 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
2624 goto out;
2625 }
2626
2627 /* final sanity check */
2628 if (!bdrv_chain_contains(bs, image_bs)) {
2629 error_setg(errp, "'%s' and image file are not in the same chain",
2630 device);
2631 goto out;
2632 }
2633
2634 /* if not r/w, reopen to make r/w */
2635 open_flags = image_bs->open_flags;
2636 ro = bdrv_is_read_only(image_bs);
2637
2638 if (ro) {
2639 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
2640 if (local_err) {
2641 error_propagate(errp, local_err);
2642 goto out;
2643 }
2644 }
2645
2646 ret = bdrv_change_backing_file(image_bs, backing_file,
2647 image_bs->drv ? image_bs->drv->format_name : "");
2648
2649 if (ret < 0) {
2650 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
2651 backing_file);
2652 /* don't exit here, so we can try to restore open flags if
2653 * appropriate */
2654 }
2655
2656 if (ro) {
2657 bdrv_reopen(image_bs, open_flags, &local_err);
2658 if (local_err) {
2659 error_propagate(errp, local_err); /* will preserve prior errp */
2660 }
2661 }
2662
2663 out:
2664 aio_context_release(aio_context);
2665 }
2666
2667 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2668 {
2669 QmpOutputVisitor *ov = qmp_output_visitor_new();
2670 BlockBackend *blk;
2671 QObject *obj;
2672 QDict *qdict;
2673 Error *local_err = NULL;
2674
2675 /* Require an ID in the top level */
2676 if (!options->has_id) {
2677 error_setg(errp, "Block device needs an ID");
2678 goto fail;
2679 }
2680
2681 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
2682 * cache.direct=false instead of silently switching to aio=threads, except
2683 * when called from drive_new().
2684 *
2685 * For now, simply forbidding the combination for all drivers will do. */
2686 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2687 bool direct = options->has_cache &&
2688 options->cache->has_direct &&
2689 options->cache->direct;
2690 if (!direct) {
2691 error_setg(errp, "aio=native requires cache.direct=true");
2692 goto fail;
2693 }
2694 }
2695
2696 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2697 &options, NULL, &local_err);
2698 if (local_err) {
2699 error_propagate(errp, local_err);
2700 goto fail;
2701 }
2702
2703 obj = qmp_output_get_qobject(ov);
2704 qdict = qobject_to_qdict(obj);
2705
2706 qdict_flatten(qdict);
2707
2708 blk = blockdev_init(NULL, qdict, &local_err);
2709 if (local_err) {
2710 error_propagate(errp, local_err);
2711 goto fail;
2712 }
2713
2714 if (bdrv_key_required(blk_bs(blk))) {
2715 blk_unref(blk);
2716 error_setg(errp, "blockdev-add doesn't support encrypted devices");
2717 goto fail;
2718 }
2719
2720 fail:
2721 qmp_output_visitor_cleanup(ov);
2722 }
2723
2724 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2725 {
2726 BlockJobInfoList *head = NULL, **p_next = &head;
2727 BlockDriverState *bs;
2728
2729 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
2730 AioContext *aio_context = bdrv_get_aio_context(bs);
2731
2732 aio_context_acquire(aio_context);
2733
2734 if (bs->job) {
2735 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2736 elem->value = block_job_query(bs->job);
2737 *p_next = elem;
2738 p_next = &elem->next;
2739 }
2740
2741 aio_context_release(aio_context);
2742 }
2743
2744 return head;
2745 }
2746
2747 QemuOptsList qemu_common_drive_opts = {
2748 .name = "drive",
2749 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2750 .desc = {
2751 {
2752 .name = "snapshot",
2753 .type = QEMU_OPT_BOOL,
2754 .help = "enable/disable snapshot mode",
2755 },{
2756 .name = "discard",
2757 .type = QEMU_OPT_STRING,
2758 .help = "discard operation (ignore/off, unmap/on)",
2759 },{
2760 .name = "cache.writeback",
2761 .type = QEMU_OPT_BOOL,
2762 .help = "enables writeback mode for any caches",
2763 },{
2764 .name = "cache.direct",
2765 .type = QEMU_OPT_BOOL,
2766 .help = "enables use of O_DIRECT (bypass the host page cache)",
2767 },{
2768 .name = "cache.no-flush",
2769 .type = QEMU_OPT_BOOL,
2770 .help = "ignore any flush requests for the device",
2771 },{
2772 .name = "aio",
2773 .type = QEMU_OPT_STRING,
2774 .help = "host AIO implementation (threads, native)",
2775 },{
2776 .name = "format",
2777 .type = QEMU_OPT_STRING,
2778 .help = "disk format (raw, qcow2, ...)",
2779 },{
2780 .name = "rerror",
2781 .type = QEMU_OPT_STRING,
2782 .help = "read error action",
2783 },{
2784 .name = "werror",
2785 .type = QEMU_OPT_STRING,
2786 .help = "write error action",
2787 },{
2788 .name = "read-only",
2789 .type = QEMU_OPT_BOOL,
2790 .help = "open drive file as read-only",
2791 },{
2792 .name = "throttling.iops-total",
2793 .type = QEMU_OPT_NUMBER,
2794 .help = "limit total I/O operations per second",
2795 },{
2796 .name = "throttling.iops-read",
2797 .type = QEMU_OPT_NUMBER,
2798 .help = "limit read operations per second",
2799 },{
2800 .name = "throttling.iops-write",
2801 .type = QEMU_OPT_NUMBER,
2802 .help = "limit write operations per second",
2803 },{
2804 .name = "throttling.bps-total",
2805 .type = QEMU_OPT_NUMBER,
2806 .help = "limit total bytes per second",
2807 },{
2808 .name = "throttling.bps-read",
2809 .type = QEMU_OPT_NUMBER,
2810 .help = "limit read bytes per second",
2811 },{
2812 .name = "throttling.bps-write",
2813 .type = QEMU_OPT_NUMBER,
2814 .help = "limit write bytes per second",
2815 },{
2816 .name = "throttling.iops-total-max",
2817 .type = QEMU_OPT_NUMBER,
2818 .help = "I/O operations burst",
2819 },{
2820 .name = "throttling.iops-read-max",
2821 .type = QEMU_OPT_NUMBER,
2822 .help = "I/O operations read burst",
2823 },{
2824 .name = "throttling.iops-write-max",
2825 .type = QEMU_OPT_NUMBER,
2826 .help = "I/O operations write burst",
2827 },{
2828 .name = "throttling.bps-total-max",
2829 .type = QEMU_OPT_NUMBER,
2830 .help = "total bytes burst",
2831 },{
2832 .name = "throttling.bps-read-max",
2833 .type = QEMU_OPT_NUMBER,
2834 .help = "total bytes read burst",
2835 },{
2836 .name = "throttling.bps-write-max",
2837 .type = QEMU_OPT_NUMBER,
2838 .help = "total bytes write burst",
2839 },{
2840 .name = "throttling.iops-size",
2841 .type = QEMU_OPT_NUMBER,
2842 .help = "when limiting by iops max size of an I/O in bytes",
2843 },{
2844 .name = "copy-on-read",
2845 .type = QEMU_OPT_BOOL,
2846 .help = "copy read data from backing file into image file",
2847 },{
2848 .name = "detect-zeroes",
2849 .type = QEMU_OPT_STRING,
2850 .help = "try to optimize zero writes (off, on, unmap)",
2851 },
2852 { /* end of list */ }
2853 },
2854 };
2855
2856 QemuOptsList qemu_drive_opts = {
2857 .name = "drive",
2858 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2859 .desc = {
2860 /*
2861 * no elements => accept any params
2862 * validation will happen later
2863 */
2864 { /* end of list */ }
2865 },
2866 };
AR7 emulation for QEMU