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block: vhdx - add header update capability.
[qemu-kvm.git] / blockdev.c
blob86e6bffdc493a1113c0984a7e9d4c35b87ddcc2f
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/blockdev.h"
34 #include "hw/block/block.h"
35 #include "block/blockjob.h"
36 #include "monitor/monitor.h"
37 #include "qapi/qmp/qerror.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 "sysemu/sysemu.h"
44 #include "block/block_int.h"
45 #include "qmp-commands.h"
46 #include "trace.h"
47 #include "sysemu/arch_init.h"
48
49 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
50 extern QemuOptsList qemu_common_drive_opts;
51
52 static const char *const if_name[IF_COUNT] = {
53 [IF_NONE] = "none",
54 [IF_IDE] = "ide",
55 [IF_SCSI] = "scsi",
56 [IF_FLOPPY] = "floppy",
57 [IF_PFLASH] = "pflash",
58 [IF_MTD] = "mtd",
59 [IF_SD] = "sd",
60 [IF_VIRTIO] = "virtio",
61 [IF_XEN] = "xen",
62 };
63
64 static const int if_max_devs[IF_COUNT] = {
65 /*
66 * Do not change these numbers! They govern how drive option
67 * index maps to unit and bus. That mapping is ABI.
68 *
69 * All controllers used to imlement if=T drives need to support
70 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
71 * Otherwise, some index values map to "impossible" bus, unit
72 * values.
73 *
74 * For instance, if you change [IF_SCSI] to 255, -drive
75 * if=scsi,index=12 no longer means bus=1,unit=5, but
76 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
77 * the drive can't be set up. Regression.
78 */
79 [IF_IDE] = 2,
80 [IF_SCSI] = 7,
81 };
82
83 /*
84 * We automatically delete the drive when a device using it gets
85 * unplugged. Questionable feature, but we can't just drop it.
86 * Device models call blockdev_mark_auto_del() to schedule the
87 * automatic deletion, and generic qdev code calls blockdev_auto_del()
88 * when deletion is actually safe.
89 */
90 void blockdev_mark_auto_del(BlockDriverState *bs)
91 {
92 DriveInfo *dinfo = drive_get_by_blockdev(bs);
93
94 if (dinfo && !dinfo->enable_auto_del) {
95 return;
96 }
97
98 if (bs->job) {
99 block_job_cancel(bs->job);
100 }
101 if (dinfo) {
102 dinfo->auto_del = 1;
103 }
104 }
105
106 void blockdev_auto_del(BlockDriverState *bs)
107 {
108 DriveInfo *dinfo = drive_get_by_blockdev(bs);
109
110 if (dinfo && dinfo->auto_del) {
111 drive_put_ref(dinfo);
112 }
113 }
114
115 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
116 {
117 int max_devs = if_max_devs[type];
118 return max_devs ? index / max_devs : 0;
119 }
120
121 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
122 {
123 int max_devs = if_max_devs[type];
124 return max_devs ? index % max_devs : index;
125 }
126
127 QemuOpts *drive_def(const char *optstr)
128 {
129 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
130 }
131
132 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
133 const char *optstr)
134 {
135 QemuOpts *opts;
136 char buf[32];
137
138 opts = drive_def(optstr);
139 if (!opts) {
140 return NULL;
141 }
142 if (type != IF_DEFAULT) {
143 qemu_opt_set(opts, "if", if_name[type]);
144 }
145 if (index >= 0) {
146 snprintf(buf, sizeof(buf), "%d", index);
147 qemu_opt_set(opts, "index", buf);
148 }
149 if (file)
150 qemu_opt_set(opts, "file", file);
151 return opts;
152 }
153
154 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
155 {
156 DriveInfo *dinfo;
157
158 /* seek interface, bus and unit */
159
160 QTAILQ_FOREACH(dinfo, &drives, next) {
161 if (dinfo->type == type &&
162 dinfo->bus == bus &&
163 dinfo->unit == unit)
164 return dinfo;
165 }
166
167 return NULL;
168 }
169
170 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
171 {
172 return drive_get(type,
173 drive_index_to_bus_id(type, index),
174 drive_index_to_unit_id(type, index));
175 }
176
177 int drive_get_max_bus(BlockInterfaceType type)
178 {
179 int max_bus;
180 DriveInfo *dinfo;
181
182 max_bus = -1;
183 QTAILQ_FOREACH(dinfo, &drives, next) {
184 if(dinfo->type == type &&
185 dinfo->bus > max_bus)
186 max_bus = dinfo->bus;
187 }
188 return max_bus;
189 }
190
191 /* Get a block device. This should only be used for single-drive devices
192 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
193 appropriate bus. */
194 DriveInfo *drive_get_next(BlockInterfaceType type)
195 {
196 static int next_block_unit[IF_COUNT];
197
198 return drive_get(type, 0, next_block_unit[type]++);
199 }
200
201 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
202 {
203 DriveInfo *dinfo;
204
205 QTAILQ_FOREACH(dinfo, &drives, next) {
206 if (dinfo->bdrv == bs) {
207 return dinfo;
208 }
209 }
210 return NULL;
211 }
212
213 static void bdrv_format_print(void *opaque, const char *name)
214 {
215 error_printf(" %s", name);
216 }
217
218 static void drive_uninit(DriveInfo *dinfo)
219 {
220 if (dinfo->opts) {
221 qemu_opts_del(dinfo->opts);
222 }
223
224 bdrv_unref(dinfo->bdrv);
225 g_free(dinfo->id);
226 QTAILQ_REMOVE(&drives, dinfo, next);
227 g_free(dinfo->serial);
228 g_free(dinfo);
229 }
230
231 void drive_put_ref(DriveInfo *dinfo)
232 {
233 assert(dinfo->refcount);
234 if (--dinfo->refcount == 0) {
235 drive_uninit(dinfo);
236 }
237 }
238
239 void drive_get_ref(DriveInfo *dinfo)
240 {
241 dinfo->refcount++;
242 }
243
244 typedef struct {
245 QEMUBH *bh;
246 BlockDriverState *bs;
247 } BDRVPutRefBH;
248
249 static void bdrv_put_ref_bh(void *opaque)
250 {
251 BDRVPutRefBH *s = opaque;
252
253 bdrv_unref(s->bs);
254 qemu_bh_delete(s->bh);
255 g_free(s);
256 }
257
258 /*
259 * Release a BDS reference in a BH
260 *
261 * It is not safe to use bdrv_unref() from a callback function when the callers
262 * still need the BlockDriverState. In such cases we schedule a BH to release
263 * the reference.
264 */
265 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
266 {
267 BDRVPutRefBH *s;
268
269 s = g_new(BDRVPutRefBH, 1);
270 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
271 s->bs = bs;
272 qemu_bh_schedule(s->bh);
273 }
274
275 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
276 {
277 if (!strcmp(buf, "ignore")) {
278 return BLOCKDEV_ON_ERROR_IGNORE;
279 } else if (!is_read && !strcmp(buf, "enospc")) {
280 return BLOCKDEV_ON_ERROR_ENOSPC;
281 } else if (!strcmp(buf, "stop")) {
282 return BLOCKDEV_ON_ERROR_STOP;
283 } else if (!strcmp(buf, "report")) {
284 return BLOCKDEV_ON_ERROR_REPORT;
285 } else {
286 error_setg(errp, "'%s' invalid %s error action",
287 buf, is_read ? "read" : "write");
288 return -1;
289 }
290 }
291
292 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
293 {
294 if (throttle_conflicting(cfg)) {
295 error_setg(errp, "bps/iops/max total values and read/write values"
296 " cannot be used at the same time");
297 return false;
298 }
299
300 if (!throttle_is_valid(cfg)) {
301 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
302 return false;
303 }
304
305 return true;
306 }
307
308 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
309
310 /* Takes the ownership of bs_opts */
311 static DriveInfo *blockdev_init(QDict *bs_opts,
312 BlockInterfaceType type,
313 Error **errp)
314 {
315 const char *buf;
316 const char *file = NULL;
317 const char *serial;
318 int ro = 0;
319 int bdrv_flags = 0;
320 int on_read_error, on_write_error;
321 DriveInfo *dinfo;
322 ThrottleConfig cfg;
323 int snapshot = 0;
324 bool copy_on_read;
325 int ret;
326 Error *error = NULL;
327 QemuOpts *opts;
328 const char *id;
329 bool has_driver_specific_opts;
330 BlockDriver *drv = NULL;
331
332 /* Check common options by copying from bs_opts to opts, all other options
333 * stay in bs_opts for processing by bdrv_open(). */
334 id = qdict_get_try_str(bs_opts, "id");
335 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
336 if (error_is_set(&error)) {
337 error_propagate(errp, error);
338 return NULL;
339 }
340
341 qemu_opts_absorb_qdict(opts, bs_opts, &error);
342 if (error_is_set(&error)) {
343 error_propagate(errp, error);
344 goto early_err;
345 }
346
347 if (id) {
348 qdict_del(bs_opts, "id");
349 }
350
351 has_driver_specific_opts = !!qdict_size(bs_opts);
352
353 /* extract parameters */
354 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
355 ro = qemu_opt_get_bool(opts, "read-only", 0);
356 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
357
358 file = qemu_opt_get(opts, "file");
359 serial = qemu_opt_get(opts, "serial");
360
361 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
362 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
363 error_setg(errp, "invalid discard option");
364 goto early_err;
365 }
366 }
367
368 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
369 bdrv_flags |= BDRV_O_CACHE_WB;
370 }
371 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
372 bdrv_flags |= BDRV_O_NOCACHE;
373 }
374 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
375 bdrv_flags |= BDRV_O_NO_FLUSH;
376 }
377
378 #ifdef CONFIG_LINUX_AIO
379 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
380 if (!strcmp(buf, "native")) {
381 bdrv_flags |= BDRV_O_NATIVE_AIO;
382 } else if (!strcmp(buf, "threads")) {
383 /* this is the default */
384 } else {
385 error_setg(errp, "invalid aio option");
386 goto early_err;
387 }
388 }
389 #endif
390
391 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
392 if (is_help_option(buf)) {
393 error_printf("Supported formats:");
394 bdrv_iterate_format(bdrv_format_print, NULL);
395 error_printf("\n");
396 goto early_err;
397 }
398
399 drv = bdrv_find_format(buf);
400 if (!drv) {
401 error_setg(errp, "'%s' invalid format", buf);
402 goto early_err;
403 }
404 }
405
406 /* disk I/O throttling */
407 memset(&cfg, 0, sizeof(cfg));
408 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
409 qemu_opt_get_number(opts, "throttling.bps-total", 0);
410 cfg.buckets[THROTTLE_BPS_READ].avg =
411 qemu_opt_get_number(opts, "throttling.bps-read", 0);
412 cfg.buckets[THROTTLE_BPS_WRITE].avg =
413 qemu_opt_get_number(opts, "throttling.bps-write", 0);
414 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
415 qemu_opt_get_number(opts, "throttling.iops-total", 0);
416 cfg.buckets[THROTTLE_OPS_READ].avg =
417 qemu_opt_get_number(opts, "throttling.iops-read", 0);
418 cfg.buckets[THROTTLE_OPS_WRITE].avg =
419 qemu_opt_get_number(opts, "throttling.iops-write", 0);
420
421 cfg.buckets[THROTTLE_BPS_TOTAL].max =
422 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
423 cfg.buckets[THROTTLE_BPS_READ].max =
424 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
425 cfg.buckets[THROTTLE_BPS_WRITE].max =
426 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
427 cfg.buckets[THROTTLE_OPS_TOTAL].max =
428 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
429 cfg.buckets[THROTTLE_OPS_READ].max =
430 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
431 cfg.buckets[THROTTLE_OPS_WRITE].max =
432 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
433
434 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
435
436 if (!check_throttle_config(&cfg, &error)) {
437 error_propagate(errp, error);
438 goto early_err;
439 }
440
441 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
442 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
443 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
444 error_setg(errp, "werror is not supported by this bus type");
445 goto early_err;
446 }
447
448 on_write_error = parse_block_error_action(buf, 0, &error);
449 if (error_is_set(&error)) {
450 error_propagate(errp, error);
451 goto early_err;
452 }
453 }
454
455 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
456 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
457 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
458 error_report("rerror is not supported by this bus type");
459 goto early_err;
460 }
461
462 on_read_error = parse_block_error_action(buf, 1, &error);
463 if (error_is_set(&error)) {
464 error_propagate(errp, error);
465 goto early_err;
466 }
467 }
468
469 /* init */
470 dinfo = g_malloc0(sizeof(*dinfo));
471 dinfo->id = g_strdup(qemu_opts_id(opts));
472 dinfo->bdrv = bdrv_new(dinfo->id);
473 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
474 dinfo->bdrv->read_only = ro;
475 dinfo->type = type;
476 dinfo->refcount = 1;
477 if (serial != NULL) {
478 dinfo->serial = g_strdup(serial);
479 }
480 QTAILQ_INSERT_TAIL(&drives, dinfo, next);
481
482 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
483
484 /* disk I/O throttling */
485 if (throttle_enabled(&cfg)) {
486 bdrv_io_limits_enable(dinfo->bdrv);
487 bdrv_set_io_limits(dinfo->bdrv, &cfg);
488 }
489
490 if (!file || !*file) {
491 if (has_driver_specific_opts) {
492 file = NULL;
493 } else {
494 QDECREF(bs_opts);
495 qemu_opts_del(opts);
496 return dinfo;
497 }
498 }
499 if (snapshot) {
500 /* always use cache=unsafe with snapshot */
501 bdrv_flags &= ~BDRV_O_CACHE_MASK;
502 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
503 }
504
505 if (copy_on_read) {
506 bdrv_flags |= BDRV_O_COPY_ON_READ;
507 }
508
509 if (runstate_check(RUN_STATE_INMIGRATE)) {
510 bdrv_flags |= BDRV_O_INCOMING;
511 }
512
513 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
514
515 QINCREF(bs_opts);
516 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
517
518 if (ret < 0) {
519 error_setg(errp, "could not open disk image %s: %s",
520 file ?: dinfo->id, error_get_pretty(error));
521 error_free(error);
522 goto err;
523 }
524
525 if (bdrv_key_required(dinfo->bdrv))
526 autostart = 0;
527
528 QDECREF(bs_opts);
529 qemu_opts_del(opts);
530
531 return dinfo;
532
533 err:
534 bdrv_unref(dinfo->bdrv);
535 g_free(dinfo->id);
536 QTAILQ_REMOVE(&drives, dinfo, next);
537 g_free(dinfo);
538 early_err:
539 QDECREF(bs_opts);
540 qemu_opts_del(opts);
541 return NULL;
542 }
543
544 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
545 {
546 const char *value;
547
548 value = qemu_opt_get(opts, from);
549 if (value) {
550 qemu_opt_set(opts, to, value);
551 qemu_opt_unset(opts, from);
552 }
553 }
554
555 QemuOptsList qemu_legacy_drive_opts = {
556 .name = "drive",
557 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
558 .desc = {
559 {
560 .name = "bus",
561 .type = QEMU_OPT_NUMBER,
562 .help = "bus number",
563 },{
564 .name = "unit",
565 .type = QEMU_OPT_NUMBER,
566 .help = "unit number (i.e. lun for scsi)",
567 },{
568 .name = "index",
569 .type = QEMU_OPT_NUMBER,
570 .help = "index number",
571 },{
572 .name = "media",
573 .type = QEMU_OPT_STRING,
574 .help = "media type (disk, cdrom)",
575 },{
576 .name = "if",
577 .type = QEMU_OPT_STRING,
578 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
579 },{
580 .name = "cyls",
581 .type = QEMU_OPT_NUMBER,
582 .help = "number of cylinders (ide disk geometry)",
583 },{
584 .name = "heads",
585 .type = QEMU_OPT_NUMBER,
586 .help = "number of heads (ide disk geometry)",
587 },{
588 .name = "secs",
589 .type = QEMU_OPT_NUMBER,
590 .help = "number of sectors (ide disk geometry)",
591 },{
592 .name = "trans",
593 .type = QEMU_OPT_STRING,
594 .help = "chs translation (auto, lba, none)",
595 },{
596 .name = "boot",
597 .type = QEMU_OPT_BOOL,
598 .help = "(deprecated, ignored)",
599 },{
600 .name = "addr",
601 .type = QEMU_OPT_STRING,
602 .help = "pci address (virtio only)",
603 },
604
605 /* Options that are passed on, but have special semantics with -drive */
606 {
607 .name = "read-only",
608 .type = QEMU_OPT_BOOL,
609 .help = "open drive file as read-only",
610 },{
611 .name = "copy-on-read",
612 .type = QEMU_OPT_BOOL,
613 .help = "copy read data from backing file into image file",
614 },
615
616 { /* end of list */ }
617 },
618 };
619
620 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
621 {
622 const char *value;
623 DriveInfo *dinfo = NULL;
624 QDict *bs_opts;
625 QemuOpts *legacy_opts;
626 DriveMediaType media = MEDIA_DISK;
627 BlockInterfaceType type;
628 int cyls, heads, secs, translation;
629 int max_devs, bus_id, unit_id, index;
630 const char *devaddr;
631 bool read_only = false;
632 bool copy_on_read;
633 Error *local_err = NULL;
634
635 /* Change legacy command line options into QMP ones */
636 qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
637 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
638 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
639
640 qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
641 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
642 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
643
644 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
645 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
646 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
647
648 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
649 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
650 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
651
652 qemu_opt_rename(all_opts,
653 "iops_size", "throttling.iops-size");
654
655 qemu_opt_rename(all_opts, "readonly", "read-only");
656
657 value = qemu_opt_get(all_opts, "cache");
658 if (value) {
659 int flags = 0;
660
661 if (bdrv_parse_cache_flags(value, &flags) != 0) {
662 error_report("invalid cache option");
663 return NULL;
664 }
665
666 /* Specific options take precedence */
667 if (!qemu_opt_get(all_opts, "cache.writeback")) {
668 qemu_opt_set_bool(all_opts, "cache.writeback",
669 !!(flags & BDRV_O_CACHE_WB));
670 }
671 if (!qemu_opt_get(all_opts, "cache.direct")) {
672 qemu_opt_set_bool(all_opts, "cache.direct",
673 !!(flags & BDRV_O_NOCACHE));
674 }
675 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
676 qemu_opt_set_bool(all_opts, "cache.no-flush",
677 !!(flags & BDRV_O_NO_FLUSH));
678 }
679 qemu_opt_unset(all_opts, "cache");
680 }
681
682 /* Get a QDict for processing the options */
683 bs_opts = qdict_new();
684 qemu_opts_to_qdict(all_opts, bs_opts);
685
686 legacy_opts = qemu_opts_create_nofail(&qemu_legacy_drive_opts);
687 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
688 if (error_is_set(&local_err)) {
689 qerror_report_err(local_err);
690 error_free(local_err);
691 goto fail;
692 }
693
694 /* Deprecated option boot=[on|off] */
695 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
696 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
697 "ignored. Future versions will reject this parameter. Please "
698 "update your scripts.\n");
699 }
700
701 /* Media type */
702 value = qemu_opt_get(legacy_opts, "media");
703 if (value) {
704 if (!strcmp(value, "disk")) {
705 media = MEDIA_DISK;
706 } else if (!strcmp(value, "cdrom")) {
707 media = MEDIA_CDROM;
708 read_only = true;
709 } else {
710 error_report("'%s' invalid media", value);
711 goto fail;
712 }
713 }
714
715 /* copy-on-read is disabled with a warning for read-only devices */
716 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
717 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
718
719 if (read_only && copy_on_read) {
720 error_report("warning: disabling copy-on-read on read-only drive");
721 copy_on_read = false;
722 }
723
724 qdict_put(bs_opts, "read-only",
725 qstring_from_str(read_only ? "on" : "off"));
726 qdict_put(bs_opts, "copy-on-read",
727 qstring_from_str(copy_on_read ? "on" :"off"));
728
729 /* Controller type */
730 value = qemu_opt_get(legacy_opts, "if");
731 if (value) {
732 for (type = 0;
733 type < IF_COUNT && strcmp(value, if_name[type]);
734 type++) {
735 }
736 if (type == IF_COUNT) {
737 error_report("unsupported bus type '%s'", value);
738 goto fail;
739 }
740 } else {
741 type = block_default_type;
742 }
743
744 /* Geometry */
745 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
746 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
747 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
748
749 if (cyls || heads || secs) {
750 if (cyls < 1) {
751 error_report("invalid physical cyls number");
752 goto fail;
753 }
754 if (heads < 1) {
755 error_report("invalid physical heads number");
756 goto fail;
757 }
758 if (secs < 1) {
759 error_report("invalid physical secs number");
760 goto fail;
761 }
762 }
763
764 translation = BIOS_ATA_TRANSLATION_AUTO;
765 value = qemu_opt_get(legacy_opts, "trans");
766 if (value != NULL) {
767 if (!cyls) {
768 error_report("'%s' trans must be used with cyls, heads and secs",
769 value);
770 goto fail;
771 }
772 if (!strcmp(value, "none")) {
773 translation = BIOS_ATA_TRANSLATION_NONE;
774 } else if (!strcmp(value, "lba")) {
775 translation = BIOS_ATA_TRANSLATION_LBA;
776 } else if (!strcmp(value, "auto")) {
777 translation = BIOS_ATA_TRANSLATION_AUTO;
778 } else {
779 error_report("'%s' invalid translation type", value);
780 goto fail;
781 }
782 }
783
784 if (media == MEDIA_CDROM) {
785 if (cyls || secs || heads) {
786 error_report("CHS can't be set with media=cdrom");
787 goto fail;
788 }
789 }
790
791 /* Device address specified by bus/unit or index.
792 * If none was specified, try to find the first free one. */
793 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
794 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
795 index = qemu_opt_get_number(legacy_opts, "index", -1);
796
797 max_devs = if_max_devs[type];
798
799 if (index != -1) {
800 if (bus_id != 0 || unit_id != -1) {
801 error_report("index cannot be used with bus and unit");
802 goto fail;
803 }
804 bus_id = drive_index_to_bus_id(type, index);
805 unit_id = drive_index_to_unit_id(type, index);
806 }
807
808 if (unit_id == -1) {
809 unit_id = 0;
810 while (drive_get(type, bus_id, unit_id) != NULL) {
811 unit_id++;
812 if (max_devs && unit_id >= max_devs) {
813 unit_id -= max_devs;
814 bus_id++;
815 }
816 }
817 }
818
819 if (max_devs && unit_id >= max_devs) {
820 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
821 goto fail;
822 }
823
824 if (drive_get(type, bus_id, unit_id) != NULL) {
825 error_report("drive with bus=%d, unit=%d (index=%d) exists",
826 bus_id, unit_id, index);
827 goto fail;
828 }
829
830 /* no id supplied -> create one */
831 if (qemu_opts_id(all_opts) == NULL) {
832 char *new_id;
833 const char *mediastr = "";
834 if (type == IF_IDE || type == IF_SCSI) {
835 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
836 }
837 if (max_devs) {
838 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
839 mediastr, unit_id);
840 } else {
841 new_id = g_strdup_printf("%s%s%i", if_name[type],
842 mediastr, unit_id);
843 }
844 qdict_put(bs_opts, "id", qstring_from_str(new_id));
845 g_free(new_id);
846 }
847
848 /* Add virtio block device */
849 devaddr = qemu_opt_get(legacy_opts, "addr");
850 if (devaddr && type != IF_VIRTIO) {
851 error_report("addr is not supported by this bus type");
852 goto fail;
853 }
854
855 if (type == IF_VIRTIO) {
856 QemuOpts *devopts;
857 devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
858 if (arch_type == QEMU_ARCH_S390X) {
859 qemu_opt_set(devopts, "driver", "virtio-blk-s390");
860 } else {
861 qemu_opt_set(devopts, "driver", "virtio-blk-pci");
862 }
863 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"));
864 if (devaddr) {
865 qemu_opt_set(devopts, "addr", devaddr);
866 }
867 }
868
869 /* Actual block device init: Functionality shared with blockdev-add */
870 dinfo = blockdev_init(bs_opts, type, &local_err);
871 if (dinfo == NULL) {
872 if (error_is_set(&local_err)) {
873 qerror_report_err(local_err);
874 error_free(local_err);
875 }
876 goto fail;
877 } else {
878 assert(!error_is_set(&local_err));
879 }
880
881 /* Set legacy DriveInfo fields */
882 dinfo->enable_auto_del = true;
883 dinfo->opts = all_opts;
884
885 dinfo->cyls = cyls;
886 dinfo->heads = heads;
887 dinfo->secs = secs;
888 dinfo->trans = translation;
889
890 dinfo->bus = bus_id;
891 dinfo->unit = unit_id;
892 dinfo->devaddr = devaddr;
893
894 switch(type) {
895 case IF_IDE:
896 case IF_SCSI:
897 case IF_XEN:
898 case IF_NONE:
899 dinfo->media_cd = media == MEDIA_CDROM;
900 break;
901 default:
902 break;
903 }
904
905 fail:
906 qemu_opts_del(legacy_opts);
907 return dinfo;
908 }
909
910 void do_commit(Monitor *mon, const QDict *qdict)
911 {
912 const char *device = qdict_get_str(qdict, "device");
913 BlockDriverState *bs;
914 int ret;
915
916 if (!strcmp(device, "all")) {
917 ret = bdrv_commit_all();
918 } else {
919 bs = bdrv_find(device);
920 if (!bs) {
921 monitor_printf(mon, "Device '%s' not found\n", device);
922 return;
923 }
924 ret = bdrv_commit(bs);
925 }
926 if (ret < 0) {
927 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
928 strerror(-ret));
929 }
930 }
931
932 static void blockdev_do_action(int kind, void *data, Error **errp)
933 {
934 TransactionAction action;
935 TransactionActionList list;
936
937 action.kind = kind;
938 action.data = data;
939 list.value = &action;
940 list.next = NULL;
941 qmp_transaction(&list, errp);
942 }
943
944 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
945 bool has_format, const char *format,
946 bool has_mode, enum NewImageMode mode,
947 Error **errp)
948 {
949 BlockdevSnapshot snapshot = {
950 .device = (char *) device,
951 .snapshot_file = (char *) snapshot_file,
952 .has_format = has_format,
953 .format = (char *) format,
954 .has_mode = has_mode,
955 .mode = mode,
956 };
957 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
958 &snapshot, errp);
959 }
960
961 void qmp_blockdev_snapshot_internal_sync(const char *device,
962 const char *name,
963 Error **errp)
964 {
965 BlockdevSnapshotInternal snapshot = {
966 .device = (char *) device,
967 .name = (char *) name
968 };
969
970 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
971 &snapshot, errp);
972 }
973
974 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
975 bool has_id,
976 const char *id,
977 bool has_name,
978 const char *name,
979 Error **errp)
980 {
981 BlockDriverState *bs = bdrv_find(device);
982 QEMUSnapshotInfo sn;
983 Error *local_err = NULL;
984 SnapshotInfo *info = NULL;
985 int ret;
986
987 if (!bs) {
988 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
989 return NULL;
990 }
991
992 if (!has_id) {
993 id = NULL;
994 }
995
996 if (!has_name) {
997 name = NULL;
998 }
999
1000 if (!id && !name) {
1001 error_setg(errp, "Name or id must be provided");
1002 return NULL;
1003 }
1004
1005 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1006 if (error_is_set(&local_err)) {
1007 error_propagate(errp, local_err);
1008 return NULL;
1009 }
1010 if (!ret) {
1011 error_setg(errp,
1012 "Snapshot with id '%s' and name '%s' does not exist on "
1013 "device '%s'",
1014 STR_OR_NULL(id), STR_OR_NULL(name), device);
1015 return NULL;
1016 }
1017
1018 bdrv_snapshot_delete(bs, id, name, &local_err);
1019 if (error_is_set(&local_err)) {
1020 error_propagate(errp, local_err);
1021 return NULL;
1022 }
1023
1024 info = g_malloc0(sizeof(SnapshotInfo));
1025 info->id = g_strdup(sn.id_str);
1026 info->name = g_strdup(sn.name);
1027 info->date_nsec = sn.date_nsec;
1028 info->date_sec = sn.date_sec;
1029 info->vm_state_size = sn.vm_state_size;
1030 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1031 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1032
1033 return info;
1034 }
1035
1036 /* New and old BlockDriverState structs for group snapshots */
1037
1038 typedef struct BlkTransactionState BlkTransactionState;
1039
1040 /* Only prepare() may fail. In a single transaction, only one of commit() or
1041 abort() will be called, clean() will always be called if it present. */
1042 typedef struct BdrvActionOps {
1043 /* Size of state struct, in bytes. */
1044 size_t instance_size;
1045 /* Prepare the work, must NOT be NULL. */
1046 void (*prepare)(BlkTransactionState *common, Error **errp);
1047 /* Commit the changes, can be NULL. */
1048 void (*commit)(BlkTransactionState *common);
1049 /* Abort the changes on fail, can be NULL. */
1050 void (*abort)(BlkTransactionState *common);
1051 /* Clean up resource in the end, can be NULL. */
1052 void (*clean)(BlkTransactionState *common);
1053 } BdrvActionOps;
1054
1055 /*
1056 * This structure must be arranged as first member in child type, assuming
1057 * that compiler will also arrange it to the same address with parent instance.
1058 * Later it will be used in free().
1059 */
1060 struct BlkTransactionState {
1061 TransactionAction *action;
1062 const BdrvActionOps *ops;
1063 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1064 };
1065
1066 /* internal snapshot private data */
1067 typedef struct InternalSnapshotState {
1068 BlkTransactionState common;
1069 BlockDriverState *bs;
1070 QEMUSnapshotInfo sn;
1071 } InternalSnapshotState;
1072
1073 static void internal_snapshot_prepare(BlkTransactionState *common,
1074 Error **errp)
1075 {
1076 const char *device;
1077 const char *name;
1078 BlockDriverState *bs;
1079 QEMUSnapshotInfo old_sn, *sn;
1080 bool ret;
1081 qemu_timeval tv;
1082 BlockdevSnapshotInternal *internal;
1083 InternalSnapshotState *state;
1084 int ret1;
1085
1086 g_assert(common->action->kind ==
1087 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1088 internal = common->action->blockdev_snapshot_internal_sync;
1089 state = DO_UPCAST(InternalSnapshotState, common, common);
1090
1091 /* 1. parse input */
1092 device = internal->device;
1093 name = internal->name;
1094
1095 /* 2. check for validation */
1096 bs = bdrv_find(device);
1097 if (!bs) {
1098 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1099 return;
1100 }
1101
1102 if (!bdrv_is_inserted(bs)) {
1103 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1104 return;
1105 }
1106
1107 if (bdrv_is_read_only(bs)) {
1108 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1109 return;
1110 }
1111
1112 if (!bdrv_can_snapshot(bs)) {
1113 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1114 bs->drv->format_name, device, "internal snapshot");
1115 return;
1116 }
1117
1118 if (!strlen(name)) {
1119 error_setg(errp, "Name is empty");
1120 return;
1121 }
1122
1123 /* check whether a snapshot with name exist */
1124 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
1125 if (error_is_set(errp)) {
1126 return;
1127 } else if (ret) {
1128 error_setg(errp,
1129 "Snapshot with name '%s' already exists on device '%s'",
1130 name, device);
1131 return;
1132 }
1133
1134 /* 3. take the snapshot */
1135 sn = &state->sn;
1136 pstrcpy(sn->name, sizeof(sn->name), name);
1137 qemu_gettimeofday(&tv);
1138 sn->date_sec = tv.tv_sec;
1139 sn->date_nsec = tv.tv_usec * 1000;
1140 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1141
1142 ret1 = bdrv_snapshot_create(bs, sn);
1143 if (ret1 < 0) {
1144 error_setg_errno(errp, -ret1,
1145 "Failed to create snapshot '%s' on device '%s'",
1146 name, device);
1147 return;
1148 }
1149
1150 /* 4. succeed, mark a snapshot is created */
1151 state->bs = bs;
1152 }
1153
1154 static void internal_snapshot_abort(BlkTransactionState *common)
1155 {
1156 InternalSnapshotState *state =
1157 DO_UPCAST(InternalSnapshotState, common, common);
1158 BlockDriverState *bs = state->bs;
1159 QEMUSnapshotInfo *sn = &state->sn;
1160 Error *local_error = NULL;
1161
1162 if (!bs) {
1163 return;
1164 }
1165
1166 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1167 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1168 "device '%s' in abort: %s",
1169 sn->id_str,
1170 sn->name,
1171 bdrv_get_device_name(bs),
1172 error_get_pretty(local_error));
1173 error_free(local_error);
1174 }
1175 }
1176
1177 /* external snapshot private data */
1178 typedef struct ExternalSnapshotState {
1179 BlkTransactionState common;
1180 BlockDriverState *old_bs;
1181 BlockDriverState *new_bs;
1182 } ExternalSnapshotState;
1183
1184 static void external_snapshot_prepare(BlkTransactionState *common,
1185 Error **errp)
1186 {
1187 BlockDriver *drv;
1188 int flags, ret;
1189 Error *local_err = NULL;
1190 const char *device;
1191 const char *new_image_file;
1192 const char *format = "qcow2";
1193 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1194 ExternalSnapshotState *state =
1195 DO_UPCAST(ExternalSnapshotState, common, common);
1196 TransactionAction *action = common->action;
1197
1198 /* get parameters */
1199 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1200
1201 device = action->blockdev_snapshot_sync->device;
1202 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1203 if (action->blockdev_snapshot_sync->has_format) {
1204 format = action->blockdev_snapshot_sync->format;
1205 }
1206 if (action->blockdev_snapshot_sync->has_mode) {
1207 mode = action->blockdev_snapshot_sync->mode;
1208 }
1209
1210 /* start processing */
1211 drv = bdrv_find_format(format);
1212 if (!drv) {
1213 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1214 return;
1215 }
1216
1217 state->old_bs = bdrv_find(device);
1218 if (!state->old_bs) {
1219 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1220 return;
1221 }
1222
1223 if (!bdrv_is_inserted(state->old_bs)) {
1224 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1225 return;
1226 }
1227
1228 if (bdrv_in_use(state->old_bs)) {
1229 error_set(errp, QERR_DEVICE_IN_USE, device);
1230 return;
1231 }
1232
1233 if (!bdrv_is_read_only(state->old_bs)) {
1234 if (bdrv_flush(state->old_bs)) {
1235 error_set(errp, QERR_IO_ERROR);
1236 return;
1237 }
1238 }
1239
1240 if (bdrv_check_ext_snapshot(state->old_bs) != EXT_SNAPSHOT_ALLOWED) {
1241 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1242 return;
1243 }
1244
1245 flags = state->old_bs->open_flags;
1246
1247 /* create new image w/backing file */
1248 if (mode != NEW_IMAGE_MODE_EXISTING) {
1249 bdrv_img_create(new_image_file, format,
1250 state->old_bs->filename,
1251 state->old_bs->drv->format_name,
1252 NULL, -1, flags, &local_err, false);
1253 if (error_is_set(&local_err)) {
1254 error_propagate(errp, local_err);
1255 return;
1256 }
1257 }
1258
1259 /* We will manually add the backing_hd field to the bs later */
1260 state->new_bs = bdrv_new("");
1261 /* TODO Inherit bs->options or only take explicit options with an
1262 * extended QMP command? */
1263 ret = bdrv_open(state->new_bs, new_image_file, NULL,
1264 flags | BDRV_O_NO_BACKING, drv, &local_err);
1265 if (ret != 0) {
1266 error_propagate(errp, local_err);
1267 }
1268 }
1269
1270 static void external_snapshot_commit(BlkTransactionState *common)
1271 {
1272 ExternalSnapshotState *state =
1273 DO_UPCAST(ExternalSnapshotState, common, common);
1274
1275 /* This removes our old bs and adds the new bs */
1276 bdrv_append(state->new_bs, state->old_bs);
1277 /* We don't need (or want) to use the transactional
1278 * bdrv_reopen_multiple() across all the entries at once, because we
1279 * don't want to abort all of them if one of them fails the reopen */
1280 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1281 NULL);
1282 }
1283
1284 static void external_snapshot_abort(BlkTransactionState *common)
1285 {
1286 ExternalSnapshotState *state =
1287 DO_UPCAST(ExternalSnapshotState, common, common);
1288 if (state->new_bs) {
1289 bdrv_unref(state->new_bs);
1290 }
1291 }
1292
1293 typedef struct DriveBackupState {
1294 BlkTransactionState common;
1295 BlockDriverState *bs;
1296 BlockJob *job;
1297 } DriveBackupState;
1298
1299 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1300 {
1301 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1302 DriveBackup *backup;
1303 Error *local_err = NULL;
1304
1305 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1306 backup = common->action->drive_backup;
1307
1308 qmp_drive_backup(backup->device, backup->target,
1309 backup->has_format, backup->format,
1310 backup->sync,
1311 backup->has_mode, backup->mode,
1312 backup->has_speed, backup->speed,
1313 backup->has_on_source_error, backup->on_source_error,
1314 backup->has_on_target_error, backup->on_target_error,
1315 &local_err);
1316 if (error_is_set(&local_err)) {
1317 error_propagate(errp, local_err);
1318 state->bs = NULL;
1319 state->job = NULL;
1320 return;
1321 }
1322
1323 state->bs = bdrv_find(backup->device);
1324 state->job = state->bs->job;
1325 }
1326
1327 static void drive_backup_abort(BlkTransactionState *common)
1328 {
1329 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1330 BlockDriverState *bs = state->bs;
1331
1332 /* Only cancel if it's the job we started */
1333 if (bs && bs->job && bs->job == state->job) {
1334 block_job_cancel_sync(bs->job);
1335 }
1336 }
1337
1338 static void abort_prepare(BlkTransactionState *common, Error **errp)
1339 {
1340 error_setg(errp, "Transaction aborted using Abort action");
1341 }
1342
1343 static void abort_commit(BlkTransactionState *common)
1344 {
1345 g_assert_not_reached(); /* this action never succeeds */
1346 }
1347
1348 static const BdrvActionOps actions[] = {
1349 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1350 .instance_size = sizeof(ExternalSnapshotState),
1351 .prepare = external_snapshot_prepare,
1352 .commit = external_snapshot_commit,
1353 .abort = external_snapshot_abort,
1354 },
1355 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1356 .instance_size = sizeof(DriveBackupState),
1357 .prepare = drive_backup_prepare,
1358 .abort = drive_backup_abort,
1359 },
1360 [TRANSACTION_ACTION_KIND_ABORT] = {
1361 .instance_size = sizeof(BlkTransactionState),
1362 .prepare = abort_prepare,
1363 .commit = abort_commit,
1364 },
1365 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1366 .instance_size = sizeof(InternalSnapshotState),
1367 .prepare = internal_snapshot_prepare,
1368 .abort = internal_snapshot_abort,
1369 },
1370 };
1371
1372 /*
1373 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1374 * then we do not pivot any of the devices in the group, and abandon the
1375 * snapshots
1376 */
1377 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1378 {
1379 TransactionActionList *dev_entry = dev_list;
1380 BlkTransactionState *state, *next;
1381 Error *local_err = NULL;
1382
1383 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1384 QSIMPLEQ_INIT(&snap_bdrv_states);
1385
1386 /* drain all i/o before any snapshots */
1387 bdrv_drain_all();
1388
1389 /* We don't do anything in this loop that commits us to the snapshot */
1390 while (NULL != dev_entry) {
1391 TransactionAction *dev_info = NULL;
1392 const BdrvActionOps *ops;
1393
1394 dev_info = dev_entry->value;
1395 dev_entry = dev_entry->next;
1396
1397 assert(dev_info->kind < ARRAY_SIZE(actions));
1398
1399 ops = &actions[dev_info->kind];
1400 assert(ops->instance_size > 0);
1401
1402 state = g_malloc0(ops->instance_size);
1403 state->ops = ops;
1404 state->action = dev_info;
1405 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1406
1407 state->ops->prepare(state, &local_err);
1408 if (error_is_set(&local_err)) {
1409 error_propagate(errp, local_err);
1410 goto delete_and_fail;
1411 }
1412 }
1413
1414 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1415 if (state->ops->commit) {
1416 state->ops->commit(state);
1417 }
1418 }
1419
1420 /* success */
1421 goto exit;
1422
1423 delete_and_fail:
1424 /*
1425 * failure, and it is all-or-none; abandon each new bs, and keep using
1426 * the original bs for all images
1427 */
1428 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1429 if (state->ops->abort) {
1430 state->ops->abort(state);
1431 }
1432 }
1433 exit:
1434 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1435 if (state->ops->clean) {
1436 state->ops->clean(state);
1437 }
1438 g_free(state);
1439 }
1440 }
1441
1442
1443 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1444 {
1445 if (bdrv_in_use(bs)) {
1446 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1447 return;
1448 }
1449 if (!bdrv_dev_has_removable_media(bs)) {
1450 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1451 return;
1452 }
1453
1454 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1455 bdrv_dev_eject_request(bs, force);
1456 if (!force) {
1457 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1458 return;
1459 }
1460 }
1461
1462 bdrv_close(bs);
1463 }
1464
1465 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1466 {
1467 BlockDriverState *bs;
1468
1469 bs = bdrv_find(device);
1470 if (!bs) {
1471 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1472 return;
1473 }
1474
1475 eject_device(bs, force, errp);
1476 }
1477
1478 void qmp_block_passwd(const char *device, const char *password, Error **errp)
1479 {
1480 BlockDriverState *bs;
1481 int err;
1482
1483 bs = bdrv_find(device);
1484 if (!bs) {
1485 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1486 return;
1487 }
1488
1489 err = bdrv_set_key(bs, password);
1490 if (err == -EINVAL) {
1491 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1492 return;
1493 } else if (err < 0) {
1494 error_set(errp, QERR_INVALID_PASSWORD);
1495 return;
1496 }
1497 }
1498
1499 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1500 int bdrv_flags, BlockDriver *drv,
1501 const char *password, Error **errp)
1502 {
1503 Error *local_err = NULL;
1504 int ret;
1505
1506 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
1507 if (ret < 0) {
1508 error_propagate(errp, local_err);
1509 return;
1510 }
1511
1512 if (bdrv_key_required(bs)) {
1513 if (password) {
1514 if (bdrv_set_key(bs, password) < 0) {
1515 error_set(errp, QERR_INVALID_PASSWORD);
1516 }
1517 } else {
1518 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1519 bdrv_get_encrypted_filename(bs));
1520 }
1521 } else if (password) {
1522 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1523 }
1524 }
1525
1526 void qmp_change_blockdev(const char *device, const char *filename,
1527 bool has_format, const char *format, Error **errp)
1528 {
1529 BlockDriverState *bs;
1530 BlockDriver *drv = NULL;
1531 int bdrv_flags;
1532 Error *err = NULL;
1533
1534 bs = bdrv_find(device);
1535 if (!bs) {
1536 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1537 return;
1538 }
1539
1540 if (format) {
1541 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1542 if (!drv) {
1543 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1544 return;
1545 }
1546 }
1547
1548 eject_device(bs, 0, &err);
1549 if (error_is_set(&err)) {
1550 error_propagate(errp, err);
1551 return;
1552 }
1553
1554 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1555 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1556
1557 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1558 }
1559
1560 /* throttling disk I/O limits */
1561 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1562 int64_t bps_wr,
1563 int64_t iops,
1564 int64_t iops_rd,
1565 int64_t iops_wr,
1566 bool has_bps_max,
1567 int64_t bps_max,
1568 bool has_bps_rd_max,
1569 int64_t bps_rd_max,
1570 bool has_bps_wr_max,
1571 int64_t bps_wr_max,
1572 bool has_iops_max,
1573 int64_t iops_max,
1574 bool has_iops_rd_max,
1575 int64_t iops_rd_max,
1576 bool has_iops_wr_max,
1577 int64_t iops_wr_max,
1578 bool has_iops_size,
1579 int64_t iops_size, Error **errp)
1580 {
1581 ThrottleConfig cfg;
1582 BlockDriverState *bs;
1583
1584 bs = bdrv_find(device);
1585 if (!bs) {
1586 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1587 return;
1588 }
1589
1590 memset(&cfg, 0, sizeof(cfg));
1591 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1592 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1593 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1594
1595 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1596 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1597 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1598
1599 if (has_bps_max) {
1600 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1601 }
1602 if (has_bps_rd_max) {
1603 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1604 }
1605 if (has_bps_wr_max) {
1606 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1607 }
1608 if (has_iops_max) {
1609 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1610 }
1611 if (has_iops_rd_max) {
1612 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1613 }
1614 if (has_iops_wr_max) {
1615 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1616 }
1617
1618 if (has_iops_size) {
1619 cfg.op_size = iops_size;
1620 }
1621
1622 if (!check_throttle_config(&cfg, errp)) {
1623 return;
1624 }
1625
1626 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1627 bdrv_io_limits_enable(bs);
1628 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1629 bdrv_io_limits_disable(bs);
1630 }
1631
1632 if (bs->io_limits_enabled) {
1633 bdrv_set_io_limits(bs, &cfg);
1634 }
1635 }
1636
1637 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1638 {
1639 const char *id = qdict_get_str(qdict, "id");
1640 BlockDriverState *bs;
1641
1642 bs = bdrv_find(id);
1643 if (!bs) {
1644 qerror_report(QERR_DEVICE_NOT_FOUND, id);
1645 return -1;
1646 }
1647 if (bdrv_in_use(bs)) {
1648 qerror_report(QERR_DEVICE_IN_USE, id);
1649 return -1;
1650 }
1651
1652 /* quiesce block driver; prevent further io */
1653 bdrv_drain_all();
1654 bdrv_flush(bs);
1655 bdrv_close(bs);
1656
1657 /* if we have a device attached to this BlockDriverState
1658 * then we need to make the drive anonymous until the device
1659 * can be removed. If this is a drive with no device backing
1660 * then we can just get rid of the block driver state right here.
1661 */
1662 if (bdrv_get_attached_dev(bs)) {
1663 bdrv_make_anon(bs);
1664
1665 /* Further I/O must not pause the guest */
1666 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1667 BLOCKDEV_ON_ERROR_REPORT);
1668 } else {
1669 drive_uninit(drive_get_by_blockdev(bs));
1670 }
1671
1672 return 0;
1673 }
1674
1675 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1676 {
1677 BlockDriverState *bs;
1678 int ret;
1679
1680 bs = bdrv_find(device);
1681 if (!bs) {
1682 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1683 return;
1684 }
1685
1686 if (size < 0) {
1687 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1688 return;
1689 }
1690
1691 /* complete all in-flight operations before resizing the device */
1692 bdrv_drain_all();
1693
1694 ret = bdrv_truncate(bs, size);
1695 switch (ret) {
1696 case 0:
1697 break;
1698 case -ENOMEDIUM:
1699 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1700 break;
1701 case -ENOTSUP:
1702 error_set(errp, QERR_UNSUPPORTED);
1703 break;
1704 case -EACCES:
1705 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1706 break;
1707 case -EBUSY:
1708 error_set(errp, QERR_DEVICE_IN_USE, device);
1709 break;
1710 default:
1711 error_setg_errno(errp, -ret, "Could not resize");
1712 break;
1713 }
1714 }
1715
1716 static void block_job_cb(void *opaque, int ret)
1717 {
1718 BlockDriverState *bs = opaque;
1719 QObject *obj;
1720
1721 trace_block_job_cb(bs, bs->job, ret);
1722
1723 assert(bs->job);
1724 obj = qobject_from_block_job(bs->job);
1725 if (ret < 0) {
1726 QDict *dict = qobject_to_qdict(obj);
1727 qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1728 }
1729
1730 if (block_job_is_cancelled(bs->job)) {
1731 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1732 } else {
1733 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1734 }
1735 qobject_decref(obj);
1736
1737 bdrv_put_ref_bh_schedule(bs);
1738 }
1739
1740 void qmp_block_stream(const char *device, bool has_base,
1741 const char *base, bool has_speed, int64_t speed,
1742 bool has_on_error, BlockdevOnError on_error,
1743 Error **errp)
1744 {
1745 BlockDriverState *bs;
1746 BlockDriverState *base_bs = NULL;
1747 Error *local_err = NULL;
1748
1749 if (!has_on_error) {
1750 on_error = BLOCKDEV_ON_ERROR_REPORT;
1751 }
1752
1753 bs = bdrv_find(device);
1754 if (!bs) {
1755 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1756 return;
1757 }
1758
1759 if (base) {
1760 base_bs = bdrv_find_backing_image(bs, base);
1761 if (base_bs == NULL) {
1762 error_set(errp, QERR_BASE_NOT_FOUND, base);
1763 return;
1764 }
1765 }
1766
1767 stream_start(bs, base_bs, base, has_speed ? speed : 0,
1768 on_error, block_job_cb, bs, &local_err);
1769 if (error_is_set(&local_err)) {
1770 error_propagate(errp, local_err);
1771 return;
1772 }
1773
1774 trace_qmp_block_stream(bs, bs->job);
1775 }
1776
1777 void qmp_block_commit(const char *device,
1778 bool has_base, const char *base, const char *top,
1779 bool has_speed, int64_t speed,
1780 Error **errp)
1781 {
1782 BlockDriverState *bs;
1783 BlockDriverState *base_bs, *top_bs;
1784 Error *local_err = NULL;
1785 /* This will be part of the QMP command, if/when the
1786 * BlockdevOnError change for blkmirror makes it in
1787 */
1788 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1789
1790 /* drain all i/o before commits */
1791 bdrv_drain_all();
1792
1793 bs = bdrv_find(device);
1794 if (!bs) {
1795 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1796 return;
1797 }
1798
1799 /* default top_bs is the active layer */
1800 top_bs = bs;
1801
1802 if (top) {
1803 if (strcmp(bs->filename, top) != 0) {
1804 top_bs = bdrv_find_backing_image(bs, top);
1805 }
1806 }
1807
1808 if (top_bs == NULL) {
1809 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1810 return;
1811 }
1812
1813 if (has_base && base) {
1814 base_bs = bdrv_find_backing_image(top_bs, base);
1815 } else {
1816 base_bs = bdrv_find_base(top_bs);
1817 }
1818
1819 if (base_bs == NULL) {
1820 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1821 return;
1822 }
1823
1824 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1825 &local_err);
1826 if (local_err != NULL) {
1827 error_propagate(errp, local_err);
1828 return;
1829 }
1830 }
1831
1832 void qmp_drive_backup(const char *device, const char *target,
1833 bool has_format, const char *format,
1834 enum MirrorSyncMode sync,
1835 bool has_mode, enum NewImageMode mode,
1836 bool has_speed, int64_t speed,
1837 bool has_on_source_error, BlockdevOnError on_source_error,
1838 bool has_on_target_error, BlockdevOnError on_target_error,
1839 Error **errp)
1840 {
1841 BlockDriverState *bs;
1842 BlockDriverState *target_bs;
1843 BlockDriverState *source = NULL;
1844 BlockDriver *drv = NULL;
1845 Error *local_err = NULL;
1846 int flags;
1847 int64_t size;
1848 int ret;
1849
1850 if (!has_speed) {
1851 speed = 0;
1852 }
1853 if (!has_on_source_error) {
1854 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1855 }
1856 if (!has_on_target_error) {
1857 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1858 }
1859 if (!has_mode) {
1860 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1861 }
1862
1863 bs = bdrv_find(device);
1864 if (!bs) {
1865 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1866 return;
1867 }
1868
1869 if (!bdrv_is_inserted(bs)) {
1870 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1871 return;
1872 }
1873
1874 if (!has_format) {
1875 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1876 }
1877 if (format) {
1878 drv = bdrv_find_format(format);
1879 if (!drv) {
1880 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1881 return;
1882 }
1883 }
1884
1885 if (bdrv_in_use(bs)) {
1886 error_set(errp, QERR_DEVICE_IN_USE, device);
1887 return;
1888 }
1889
1890 flags = bs->open_flags | BDRV_O_RDWR;
1891
1892 /* See if we have a backing HD we can use to create our new image
1893 * on top of. */
1894 if (sync == MIRROR_SYNC_MODE_TOP) {
1895 source = bs->backing_hd;
1896 if (!source) {
1897 sync = MIRROR_SYNC_MODE_FULL;
1898 }
1899 }
1900 if (sync == MIRROR_SYNC_MODE_NONE) {
1901 source = bs;
1902 }
1903
1904 size = bdrv_getlength(bs);
1905 if (size < 0) {
1906 error_setg_errno(errp, -size, "bdrv_getlength failed");
1907 return;
1908 }
1909
1910 if (mode != NEW_IMAGE_MODE_EXISTING) {
1911 assert(format && drv);
1912 if (source) {
1913 bdrv_img_create(target, format, source->filename,
1914 source->drv->format_name, NULL,
1915 size, flags, &local_err, false);
1916 } else {
1917 bdrv_img_create(target, format, NULL, NULL, NULL,
1918 size, flags, &local_err, false);
1919 }
1920 }
1921
1922 if (error_is_set(&local_err)) {
1923 error_propagate(errp, local_err);
1924 return;
1925 }
1926
1927 target_bs = bdrv_new("");
1928 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
1929 if (ret < 0) {
1930 bdrv_unref(target_bs);
1931 error_propagate(errp, local_err);
1932 return;
1933 }
1934
1935 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1936 block_job_cb, bs, &local_err);
1937 if (local_err != NULL) {
1938 bdrv_unref(target_bs);
1939 error_propagate(errp, local_err);
1940 return;
1941 }
1942 }
1943
1944 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
1945
1946 void qmp_drive_mirror(const char *device, const char *target,
1947 bool has_format, const char *format,
1948 enum MirrorSyncMode sync,
1949 bool has_mode, enum NewImageMode mode,
1950 bool has_speed, int64_t speed,
1951 bool has_granularity, uint32_t granularity,
1952 bool has_buf_size, int64_t buf_size,
1953 bool has_on_source_error, BlockdevOnError on_source_error,
1954 bool has_on_target_error, BlockdevOnError on_target_error,
1955 Error **errp)
1956 {
1957 BlockDriverState *bs;
1958 BlockDriverState *source, *target_bs;
1959 BlockDriver *drv = NULL;
1960 Error *local_err = NULL;
1961 int flags;
1962 int64_t size;
1963 int ret;
1964
1965 if (!has_speed) {
1966 speed = 0;
1967 }
1968 if (!has_on_source_error) {
1969 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1970 }
1971 if (!has_on_target_error) {
1972 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1973 }
1974 if (!has_mode) {
1975 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1976 }
1977 if (!has_granularity) {
1978 granularity = 0;
1979 }
1980 if (!has_buf_size) {
1981 buf_size = DEFAULT_MIRROR_BUF_SIZE;
1982 }
1983
1984 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1985 error_set(errp, QERR_INVALID_PARAMETER, device);
1986 return;
1987 }
1988 if (granularity & (granularity - 1)) {
1989 error_set(errp, QERR_INVALID_PARAMETER, device);
1990 return;
1991 }
1992
1993 bs = bdrv_find(device);
1994 if (!bs) {
1995 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1996 return;
1997 }
1998
1999 if (!bdrv_is_inserted(bs)) {
2000 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2001 return;
2002 }
2003
2004 if (!has_format) {
2005 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2006 }
2007 if (format) {
2008 drv = bdrv_find_format(format);
2009 if (!drv) {
2010 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2011 return;
2012 }
2013 }
2014
2015 if (bdrv_in_use(bs)) {
2016 error_set(errp, QERR_DEVICE_IN_USE, device);
2017 return;
2018 }
2019
2020 flags = bs->open_flags | BDRV_O_RDWR;
2021 source = bs->backing_hd;
2022 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2023 sync = MIRROR_SYNC_MODE_FULL;
2024 }
2025
2026 size = bdrv_getlength(bs);
2027 if (size < 0) {
2028 error_setg_errno(errp, -size, "bdrv_getlength failed");
2029 return;
2030 }
2031
2032 if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
2033 /* create new image w/o backing file */
2034 assert(format && drv);
2035 bdrv_img_create(target, format,
2036 NULL, NULL, NULL, size, flags, &local_err, false);
2037 } else {
2038 switch (mode) {
2039 case NEW_IMAGE_MODE_EXISTING:
2040 break;
2041 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2042 /* create new image with backing file */
2043 bdrv_img_create(target, format,
2044 source->filename,
2045 source->drv->format_name,
2046 NULL, size, flags, &local_err, false);
2047 break;
2048 default:
2049 abort();
2050 }
2051 }
2052
2053 if (error_is_set(&local_err)) {
2054 error_propagate(errp, local_err);
2055 return;
2056 }
2057
2058 /* Mirroring takes care of copy-on-write using the source's backing
2059 * file.
2060 */
2061 target_bs = bdrv_new("");
2062 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
2063 &local_err);
2064 if (ret < 0) {
2065 bdrv_unref(target_bs);
2066 error_propagate(errp, local_err);
2067 return;
2068 }
2069
2070 mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
2071 on_source_error, on_target_error,
2072 block_job_cb, bs, &local_err);
2073 if (local_err != NULL) {
2074 bdrv_unref(target_bs);
2075 error_propagate(errp, local_err);
2076 return;
2077 }
2078 }
2079
2080 static BlockJob *find_block_job(const char *device)
2081 {
2082 BlockDriverState *bs;
2083
2084 bs = bdrv_find(device);
2085 if (!bs || !bs->job) {
2086 return NULL;
2087 }
2088 return bs->job;
2089 }
2090
2091 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2092 {
2093 BlockJob *job = find_block_job(device);
2094
2095 if (!job) {
2096 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2097 return;
2098 }
2099
2100 block_job_set_speed(job, speed, errp);
2101 }
2102
2103 void qmp_block_job_cancel(const char *device,
2104 bool has_force, bool force, Error **errp)
2105 {
2106 BlockJob *job = find_block_job(device);
2107
2108 if (!has_force) {
2109 force = false;
2110 }
2111
2112 if (!job) {
2113 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2114 return;
2115 }
2116 if (job->paused && !force) {
2117 error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
2118 return;
2119 }
2120
2121 trace_qmp_block_job_cancel(job);
2122 block_job_cancel(job);
2123 }
2124
2125 void qmp_block_job_pause(const char *device, Error **errp)
2126 {
2127 BlockJob *job = find_block_job(device);
2128
2129 if (!job) {
2130 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2131 return;
2132 }
2133
2134 trace_qmp_block_job_pause(job);
2135 block_job_pause(job);
2136 }
2137
2138 void qmp_block_job_resume(const char *device, Error **errp)
2139 {
2140 BlockJob *job = find_block_job(device);
2141
2142 if (!job) {
2143 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2144 return;
2145 }
2146
2147 trace_qmp_block_job_resume(job);
2148 block_job_resume(job);
2149 }
2150
2151 void qmp_block_job_complete(const char *device, Error **errp)
2152 {
2153 BlockJob *job = find_block_job(device);
2154
2155 if (!job) {
2156 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2157 return;
2158 }
2159
2160 trace_qmp_block_job_complete(job);
2161 block_job_complete(job, errp);
2162 }
2163
2164 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2165 {
2166 QmpOutputVisitor *ov = qmp_output_visitor_new();
2167 QObject *obj;
2168 QDict *qdict;
2169 Error *local_err = NULL;
2170
2171 /* Require an ID in the top level */
2172 if (!options->has_id) {
2173 error_setg(errp, "Block device needs an ID");
2174 goto fail;
2175 }
2176
2177 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with
2178 * cache.direct=false instead of silently switching to aio=threads, except
2179 * if called from drive_init.
2180 *
2181 * For now, simply forbidding the combination for all drivers will do. */
2182 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2183 bool direct = options->cache->has_direct && options->cache->direct;
2184 if (!options->has_cache && !direct) {
2185 error_setg(errp, "aio=native requires cache.direct=true");
2186 goto fail;
2187 }
2188 }
2189
2190 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2191 &options, NULL, &local_err);
2192 if (error_is_set(&local_err)) {
2193 error_propagate(errp, local_err);
2194 goto fail;
2195 }
2196
2197 obj = qmp_output_get_qobject(ov);
2198 qdict = qobject_to_qdict(obj);
2199
2200 qdict_flatten(qdict);
2201
2202 blockdev_init(qdict, IF_NONE, &local_err);
2203 if (error_is_set(&local_err)) {
2204 error_propagate(errp, local_err);
2205 goto fail;
2206 }
2207
2208 fail:
2209 qmp_output_visitor_cleanup(ov);
2210 }
2211
2212 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2213 {
2214 BlockJobInfoList **prev = opaque;
2215 BlockJob *job = bs->job;
2216
2217 if (job) {
2218 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2219 elem->value = block_job_query(bs->job);
2220 (*prev)->next = elem;
2221 *prev = elem;
2222 }
2223 }
2224
2225 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2226 {
2227 /* Dummy is a fake list element for holding the head pointer */
2228 BlockJobInfoList dummy = {};
2229 BlockJobInfoList *prev = &dummy;
2230 bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2231 return dummy.next;
2232 }
2233
2234 QemuOptsList qemu_common_drive_opts = {
2235 .name = "drive",
2236 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2237 .desc = {
2238 {
2239 .name = "snapshot",
2240 .type = QEMU_OPT_BOOL,
2241 .help = "enable/disable snapshot mode",
2242 },{
2243 .name = "file",
2244 .type = QEMU_OPT_STRING,
2245 .help = "disk image",
2246 },{
2247 .name = "discard",
2248 .type = QEMU_OPT_STRING,
2249 .help = "discard operation (ignore/off, unmap/on)",
2250 },{
2251 .name = "cache.writeback",
2252 .type = QEMU_OPT_BOOL,
2253 .help = "enables writeback mode for any caches",
2254 },{
2255 .name = "cache.direct",
2256 .type = QEMU_OPT_BOOL,
2257 .help = "enables use of O_DIRECT (bypass the host page cache)",
2258 },{
2259 .name = "cache.no-flush",
2260 .type = QEMU_OPT_BOOL,
2261 .help = "ignore any flush requests for the device",
2262 },{
2263 .name = "aio",
2264 .type = QEMU_OPT_STRING,
2265 .help = "host AIO implementation (threads, native)",
2266 },{
2267 .name = "format",
2268 .type = QEMU_OPT_STRING,
2269 .help = "disk format (raw, qcow2, ...)",
2270 },{
2271 .name = "serial",
2272 .type = QEMU_OPT_STRING,
2273 .help = "disk serial number",
2274 },{
2275 .name = "rerror",
2276 .type = QEMU_OPT_STRING,
2277 .help = "read error action",
2278 },{
2279 .name = "werror",
2280 .type = QEMU_OPT_STRING,
2281 .help = "write error action",
2282 },{
2283 .name = "read-only",
2284 .type = QEMU_OPT_BOOL,
2285 .help = "open drive file as read-only",
2286 },{
2287 .name = "throttling.iops-total",
2288 .type = QEMU_OPT_NUMBER,
2289 .help = "limit total I/O operations per second",
2290 },{
2291 .name = "throttling.iops-read",
2292 .type = QEMU_OPT_NUMBER,
2293 .help = "limit read operations per second",
2294 },{
2295 .name = "throttling.iops-write",
2296 .type = QEMU_OPT_NUMBER,
2297 .help = "limit write operations per second",
2298 },{
2299 .name = "throttling.bps-total",
2300 .type = QEMU_OPT_NUMBER,
2301 .help = "limit total bytes per second",
2302 },{
2303 .name = "throttling.bps-read",
2304 .type = QEMU_OPT_NUMBER,
2305 .help = "limit read bytes per second",
2306 },{
2307 .name = "throttling.bps-write",
2308 .type = QEMU_OPT_NUMBER,
2309 .help = "limit write bytes per second",
2310 },{
2311 .name = "throttling.iops-total-max",
2312 .type = QEMU_OPT_NUMBER,
2313 .help = "I/O operations burst",
2314 },{
2315 .name = "throttling.iops-read-max",
2316 .type = QEMU_OPT_NUMBER,
2317 .help = "I/O operations read burst",
2318 },{
2319 .name = "throttling.iops-write-max",
2320 .type = QEMU_OPT_NUMBER,
2321 .help = "I/O operations write burst",
2322 },{
2323 .name = "throttling.bps-total-max",
2324 .type = QEMU_OPT_NUMBER,
2325 .help = "total bytes burst",
2326 },{
2327 .name = "throttling.bps-read-max",
2328 .type = QEMU_OPT_NUMBER,
2329 .help = "total bytes read burst",
2330 },{
2331 .name = "throttling.bps-write-max",
2332 .type = QEMU_OPT_NUMBER,
2333 .help = "total bytes write burst",
2334 },{
2335 .name = "throttling.iops-size",
2336 .type = QEMU_OPT_NUMBER,
2337 .help = "when limiting by iops max size of an I/O in bytes",
2338 },{
2339 .name = "copy-on-read",
2340 .type = QEMU_OPT_BOOL,
2341 .help = "copy read data from backing file into image file",
2342 },
2343 { /* end of list */ }
2344 },
2345 };
2346
2347 QemuOptsList qemu_drive_opts = {
2348 .name = "drive",
2349 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2350 .desc = {
2351 /*
2352 * no elements => accept any params
2353 * validation will happen later
2354 */
2355 { /* end of list */ }
2356 },
2357 };
QEMU modified to work with kvm