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block: Add bdrv_open_image()
[qemu.git] / blockdev.c
blobe4574943423218e8954c1cbd0c5c45144b192c70
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
51 static const char *const if_name[IF_COUNT] = {
52 [IF_NONE] = "none",
53 [IF_IDE] = "ide",
54 [IF_SCSI] = "scsi",
55 [IF_FLOPPY] = "floppy",
56 [IF_PFLASH] = "pflash",
57 [IF_MTD] = "mtd",
58 [IF_SD] = "sd",
59 [IF_VIRTIO] = "virtio",
60 [IF_XEN] = "xen",
61 };
62
63 static const int if_max_devs[IF_COUNT] = {
64 /*
65 * Do not change these numbers! They govern how drive option
66 * index maps to unit and bus. That mapping is ABI.
67 *
68 * All controllers used to imlement if=T drives need to support
69 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
70 * Otherwise, some index values map to "impossible" bus, unit
71 * values.
72 *
73 * For instance, if you change [IF_SCSI] to 255, -drive
74 * if=scsi,index=12 no longer means bus=1,unit=5, but
75 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
76 * the drive can't be set up. Regression.
77 */
78 [IF_IDE] = 2,
79 [IF_SCSI] = 7,
80 };
81
82 /*
83 * We automatically delete the drive when a device using it gets
84 * unplugged. Questionable feature, but we can't just drop it.
85 * Device models call blockdev_mark_auto_del() to schedule the
86 * automatic deletion, and generic qdev code calls blockdev_auto_del()
87 * when deletion is actually safe.
88 */
89 void blockdev_mark_auto_del(BlockDriverState *bs)
90 {
91 DriveInfo *dinfo = drive_get_by_blockdev(bs);
92
93 if (dinfo && !dinfo->enable_auto_del) {
94 return;
95 }
96
97 if (bs->job) {
98 block_job_cancel(bs->job);
99 }
100 if (dinfo) {
101 dinfo->auto_del = 1;
102 }
103 }
104
105 void blockdev_auto_del(BlockDriverState *bs)
106 {
107 DriveInfo *dinfo = drive_get_by_blockdev(bs);
108
109 if (dinfo && dinfo->auto_del) {
110 drive_put_ref(dinfo);
111 }
112 }
113
114 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
115 {
116 int max_devs = if_max_devs[type];
117 return max_devs ? index / max_devs : 0;
118 }
119
120 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
121 {
122 int max_devs = if_max_devs[type];
123 return max_devs ? index % max_devs : index;
124 }
125
126 QemuOpts *drive_def(const char *optstr)
127 {
128 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
129 }
130
131 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
132 const char *optstr)
133 {
134 QemuOpts *opts;
135 char buf[32];
136
137 opts = drive_def(optstr);
138 if (!opts) {
139 return NULL;
140 }
141 if (type != IF_DEFAULT) {
142 qemu_opt_set(opts, "if", if_name[type]);
143 }
144 if (index >= 0) {
145 snprintf(buf, sizeof(buf), "%d", index);
146 qemu_opt_set(opts, "index", buf);
147 }
148 if (file)
149 qemu_opt_set(opts, "file", file);
150 return opts;
151 }
152
153 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
154 {
155 DriveInfo *dinfo;
156
157 /* seek interface, bus and unit */
158
159 QTAILQ_FOREACH(dinfo, &drives, next) {
160 if (dinfo->type == type &&
161 dinfo->bus == bus &&
162 dinfo->unit == unit)
163 return dinfo;
164 }
165
166 return NULL;
167 }
168
169 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
170 {
171 return drive_get(type,
172 drive_index_to_bus_id(type, index),
173 drive_index_to_unit_id(type, index));
174 }
175
176 int drive_get_max_bus(BlockInterfaceType type)
177 {
178 int max_bus;
179 DriveInfo *dinfo;
180
181 max_bus = -1;
182 QTAILQ_FOREACH(dinfo, &drives, next) {
183 if(dinfo->type == type &&
184 dinfo->bus > max_bus)
185 max_bus = dinfo->bus;
186 }
187 return max_bus;
188 }
189
190 /* Get a block device. This should only be used for single-drive devices
191 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
192 appropriate bus. */
193 DriveInfo *drive_get_next(BlockInterfaceType type)
194 {
195 static int next_block_unit[IF_COUNT];
196
197 return drive_get(type, 0, next_block_unit[type]++);
198 }
199
200 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
201 {
202 DriveInfo *dinfo;
203
204 QTAILQ_FOREACH(dinfo, &drives, next) {
205 if (dinfo->bdrv == bs) {
206 return dinfo;
207 }
208 }
209 return NULL;
210 }
211
212 static void bdrv_format_print(void *opaque, const char *name)
213 {
214 error_printf(" %s", name);
215 }
216
217 static void drive_uninit(DriveInfo *dinfo)
218 {
219 if (dinfo->opts) {
220 qemu_opts_del(dinfo->opts);
221 }
222
223 bdrv_unref(dinfo->bdrv);
224 g_free(dinfo->id);
225 QTAILQ_REMOVE(&drives, dinfo, next);
226 g_free(dinfo->serial);
227 g_free(dinfo);
228 }
229
230 void drive_put_ref(DriveInfo *dinfo)
231 {
232 assert(dinfo->refcount);
233 if (--dinfo->refcount == 0) {
234 drive_uninit(dinfo);
235 }
236 }
237
238 void drive_get_ref(DriveInfo *dinfo)
239 {
240 dinfo->refcount++;
241 }
242
243 typedef struct {
244 QEMUBH *bh;
245 BlockDriverState *bs;
246 } BDRVPutRefBH;
247
248 static void bdrv_put_ref_bh(void *opaque)
249 {
250 BDRVPutRefBH *s = opaque;
251
252 bdrv_unref(s->bs);
253 qemu_bh_delete(s->bh);
254 g_free(s);
255 }
256
257 /*
258 * Release a BDS reference in a BH
259 *
260 * It is not safe to use bdrv_unref() from a callback function when the callers
261 * still need the BlockDriverState. In such cases we schedule a BH to release
262 * the reference.
263 */
264 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
265 {
266 BDRVPutRefBH *s;
267
268 s = g_new(BDRVPutRefBH, 1);
269 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
270 s->bs = bs;
271 qemu_bh_schedule(s->bh);
272 }
273
274 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
275 {
276 if (!strcmp(buf, "ignore")) {
277 return BLOCKDEV_ON_ERROR_IGNORE;
278 } else if (!is_read && !strcmp(buf, "enospc")) {
279 return BLOCKDEV_ON_ERROR_ENOSPC;
280 } else if (!strcmp(buf, "stop")) {
281 return BLOCKDEV_ON_ERROR_STOP;
282 } else if (!strcmp(buf, "report")) {
283 return BLOCKDEV_ON_ERROR_REPORT;
284 } else {
285 error_setg(errp, "'%s' invalid %s error action",
286 buf, is_read ? "read" : "write");
287 return -1;
288 }
289 }
290
291 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
292 {
293 if (throttle_conflicting(cfg)) {
294 error_setg(errp, "bps/iops/max total values and read/write values"
295 " cannot be used at the same time");
296 return false;
297 }
298
299 if (!throttle_is_valid(cfg)) {
300 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
301 return false;
302 }
303
304 return true;
305 }
306
307 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
308
309 /* Takes the ownership of bs_opts */
310 static DriveInfo *blockdev_init(QDict *bs_opts,
311 BlockInterfaceType type,
312 Error **errp)
313 {
314 const char *buf;
315 const char *file = NULL;
316 const char *serial;
317 int ro = 0;
318 int bdrv_flags = 0;
319 int on_read_error, on_write_error;
320 DriveInfo *dinfo;
321 ThrottleConfig cfg;
322 int snapshot = 0;
323 bool copy_on_read;
324 int ret;
325 Error *error = NULL;
326 QemuOpts *opts;
327 const char *id;
328 bool has_driver_specific_opts;
329 BlockDriver *drv = NULL;
330
331 /* Check common options by copying from bs_opts to opts, all other options
332 * stay in bs_opts for processing by bdrv_open(). */
333 id = qdict_get_try_str(bs_opts, "id");
334 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
335 if (error_is_set(&error)) {
336 error_propagate(errp, error);
337 return NULL;
338 }
339
340 qemu_opts_absorb_qdict(opts, bs_opts, &error);
341 if (error_is_set(&error)) {
342 error_propagate(errp, error);
343 goto early_err;
344 }
345
346 if (id) {
347 qdict_del(bs_opts, "id");
348 }
349
350 has_driver_specific_opts = !!qdict_size(bs_opts);
351
352 /* extract parameters */
353 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
354 ro = qemu_opt_get_bool(opts, "read-only", 0);
355 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
356
357 file = qemu_opt_get(opts, "file");
358 serial = qemu_opt_get(opts, "serial");
359
360 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
361 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
362 error_setg(errp, "invalid discard option");
363 goto early_err;
364 }
365 }
366
367 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
368 bdrv_flags |= BDRV_O_CACHE_WB;
369 }
370 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
371 bdrv_flags |= BDRV_O_NOCACHE;
372 }
373 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
374 bdrv_flags |= BDRV_O_NO_FLUSH;
375 }
376
377 #ifdef CONFIG_LINUX_AIO
378 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
379 if (!strcmp(buf, "native")) {
380 bdrv_flags |= BDRV_O_NATIVE_AIO;
381 } else if (!strcmp(buf, "threads")) {
382 /* this is the default */
383 } else {
384 error_setg(errp, "invalid aio option");
385 goto early_err;
386 }
387 }
388 #endif
389
390 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
391 if (is_help_option(buf)) {
392 error_printf("Supported formats:");
393 bdrv_iterate_format(bdrv_format_print, NULL);
394 error_printf("\n");
395 goto early_err;
396 }
397
398 drv = bdrv_find_format(buf);
399 if (!drv) {
400 error_setg(errp, "'%s' invalid format", buf);
401 goto early_err;
402 }
403 }
404
405 /* disk I/O throttling */
406 memset(&cfg, 0, sizeof(cfg));
407 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
408 qemu_opt_get_number(opts, "throttling.bps-total", 0);
409 cfg.buckets[THROTTLE_BPS_READ].avg =
410 qemu_opt_get_number(opts, "throttling.bps-read", 0);
411 cfg.buckets[THROTTLE_BPS_WRITE].avg =
412 qemu_opt_get_number(opts, "throttling.bps-write", 0);
413 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
414 qemu_opt_get_number(opts, "throttling.iops-total", 0);
415 cfg.buckets[THROTTLE_OPS_READ].avg =
416 qemu_opt_get_number(opts, "throttling.iops-read", 0);
417 cfg.buckets[THROTTLE_OPS_WRITE].avg =
418 qemu_opt_get_number(opts, "throttling.iops-write", 0);
419
420 cfg.buckets[THROTTLE_BPS_TOTAL].max =
421 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
422 cfg.buckets[THROTTLE_BPS_READ].max =
423 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
424 cfg.buckets[THROTTLE_BPS_WRITE].max =
425 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
426 cfg.buckets[THROTTLE_OPS_TOTAL].max =
427 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
428 cfg.buckets[THROTTLE_OPS_READ].max =
429 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
430 cfg.buckets[THROTTLE_OPS_WRITE].max =
431 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
432
433 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
434
435 if (!check_throttle_config(&cfg, &error)) {
436 error_propagate(errp, error);
437 goto early_err;
438 }
439
440 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
441 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
442 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
443 error_setg(errp, "werror is not supported by this bus type");
444 goto early_err;
445 }
446
447 on_write_error = parse_block_error_action(buf, 0, &error);
448 if (error_is_set(&error)) {
449 error_propagate(errp, error);
450 goto early_err;
451 }
452 }
453
454 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
455 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
456 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
457 error_report("rerror is not supported by this bus type");
458 goto early_err;
459 }
460
461 on_read_error = parse_block_error_action(buf, 1, &error);
462 if (error_is_set(&error)) {
463 error_propagate(errp, error);
464 goto early_err;
465 }
466 }
467
468 /* init */
469 dinfo = g_malloc0(sizeof(*dinfo));
470 dinfo->id = g_strdup(qemu_opts_id(opts));
471 dinfo->bdrv = bdrv_new(dinfo->id);
472 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
473 dinfo->bdrv->read_only = ro;
474 dinfo->type = type;
475 dinfo->refcount = 1;
476 if (serial != NULL) {
477 dinfo->serial = g_strdup(serial);
478 }
479 QTAILQ_INSERT_TAIL(&drives, dinfo, next);
480
481 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
482
483 /* disk I/O throttling */
484 if (throttle_enabled(&cfg)) {
485 bdrv_io_limits_enable(dinfo->bdrv);
486 bdrv_set_io_limits(dinfo->bdrv, &cfg);
487 }
488
489 if (!file || !*file) {
490 if (has_driver_specific_opts) {
491 file = NULL;
492 } else {
493 QDECREF(bs_opts);
494 qemu_opts_del(opts);
495 return dinfo;
496 }
497 }
498 if (snapshot) {
499 /* always use cache=unsafe with snapshot */
500 bdrv_flags &= ~BDRV_O_CACHE_MASK;
501 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
502 }
503
504 if (copy_on_read) {
505 bdrv_flags |= BDRV_O_COPY_ON_READ;
506 }
507
508 if (runstate_check(RUN_STATE_INMIGRATE)) {
509 bdrv_flags |= BDRV_O_INCOMING;
510 }
511
512 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
513
514 QINCREF(bs_opts);
515 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
516
517 if (ret < 0) {
518 error_setg(errp, "could not open disk image %s: %s",
519 file ?: dinfo->id, error_get_pretty(error));
520 error_free(error);
521 goto err;
522 }
523
524 if (bdrv_key_required(dinfo->bdrv))
525 autostart = 0;
526
527 QDECREF(bs_opts);
528 qemu_opts_del(opts);
529
530 return dinfo;
531
532 err:
533 bdrv_unref(dinfo->bdrv);
534 g_free(dinfo->id);
535 QTAILQ_REMOVE(&drives, dinfo, next);
536 g_free(dinfo);
537 early_err:
538 QDECREF(bs_opts);
539 qemu_opts_del(opts);
540 return NULL;
541 }
542
543 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
544 {
545 const char *value;
546
547 value = qemu_opt_get(opts, from);
548 if (value) {
549 qemu_opt_set(opts, to, value);
550 qemu_opt_unset(opts, from);
551 }
552 }
553
554 QemuOptsList qemu_legacy_drive_opts = {
555 .name = "drive",
556 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
557 .desc = {
558 {
559 .name = "bus",
560 .type = QEMU_OPT_NUMBER,
561 .help = "bus number",
562 },{
563 .name = "unit",
564 .type = QEMU_OPT_NUMBER,
565 .help = "unit number (i.e. lun for scsi)",
566 },{
567 .name = "index",
568 .type = QEMU_OPT_NUMBER,
569 .help = "index number",
570 },{
571 .name = "media",
572 .type = QEMU_OPT_STRING,
573 .help = "media type (disk, cdrom)",
574 },{
575 .name = "if",
576 .type = QEMU_OPT_STRING,
577 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
578 },{
579 .name = "cyls",
580 .type = QEMU_OPT_NUMBER,
581 .help = "number of cylinders (ide disk geometry)",
582 },{
583 .name = "heads",
584 .type = QEMU_OPT_NUMBER,
585 .help = "number of heads (ide disk geometry)",
586 },{
587 .name = "secs",
588 .type = QEMU_OPT_NUMBER,
589 .help = "number of sectors (ide disk geometry)",
590 },{
591 .name = "trans",
592 .type = QEMU_OPT_STRING,
593 .help = "chs translation (auto, lba, none)",
594 },{
595 .name = "boot",
596 .type = QEMU_OPT_BOOL,
597 .help = "(deprecated, ignored)",
598 },{
599 .name = "addr",
600 .type = QEMU_OPT_STRING,
601 .help = "pci address (virtio only)",
602 },
603
604 /* Options that are passed on, but have special semantics with -drive */
605 {
606 .name = "read-only",
607 .type = QEMU_OPT_BOOL,
608 .help = "open drive file as read-only",
609 },{
610 .name = "copy-on-read",
611 .type = QEMU_OPT_BOOL,
612 .help = "copy read data from backing file into image file",
613 },
614
615 { /* end of list */ }
616 },
617 };
618
619 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
620 {
621 const char *value;
622 DriveInfo *dinfo = NULL;
623 QDict *bs_opts;
624 QemuOpts *legacy_opts;
625 DriveMediaType media = MEDIA_DISK;
626 BlockInterfaceType type;
627 int cyls, heads, secs, translation;
628 int max_devs, bus_id, unit_id, index;
629 const char *devaddr;
630 bool read_only = false;
631 bool copy_on_read;
632 Error *local_err = NULL;
633
634 /* Change legacy command line options into QMP ones */
635 qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
636 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
637 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
638
639 qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
640 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
641 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
642
643 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
644 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
645 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
646
647 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
648 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
649 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
650
651 qemu_opt_rename(all_opts,
652 "iops_size", "throttling.iops-size");
653
654 qemu_opt_rename(all_opts, "readonly", "read-only");
655
656 value = qemu_opt_get(all_opts, "cache");
657 if (value) {
658 int flags = 0;
659
660 if (bdrv_parse_cache_flags(value, &flags) != 0) {
661 error_report("invalid cache option");
662 return NULL;
663 }
664
665 /* Specific options take precedence */
666 if (!qemu_opt_get(all_opts, "cache.writeback")) {
667 qemu_opt_set_bool(all_opts, "cache.writeback",
668 !!(flags & BDRV_O_CACHE_WB));
669 }
670 if (!qemu_opt_get(all_opts, "cache.direct")) {
671 qemu_opt_set_bool(all_opts, "cache.direct",
672 !!(flags & BDRV_O_NOCACHE));
673 }
674 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
675 qemu_opt_set_bool(all_opts, "cache.no-flush",
676 !!(flags & BDRV_O_NO_FLUSH));
677 }
678 qemu_opt_unset(all_opts, "cache");
679 }
680
681 /* Get a QDict for processing the options */
682 bs_opts = qdict_new();
683 qemu_opts_to_qdict(all_opts, bs_opts);
684
685 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
686 &error_abort);
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(qemu_find_opts("device"), NULL, 0,
858 &error_abort);
859 if (arch_type == QEMU_ARCH_S390X) {
860 qemu_opt_set(devopts, "driver", "virtio-blk-s390");
861 } else {
862 qemu_opt_set(devopts, "driver", "virtio-blk-pci");
863 }
864 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"));
865 if (devaddr) {
866 qemu_opt_set(devopts, "addr", devaddr);
867 }
868 }
869
870 /* Actual block device init: Functionality shared with blockdev-add */
871 dinfo = blockdev_init(bs_opts, type, &local_err);
872 if (dinfo == NULL) {
873 if (error_is_set(&local_err)) {
874 qerror_report_err(local_err);
875 error_free(local_err);
876 }
877 goto fail;
878 } else {
879 assert(!error_is_set(&local_err));
880 }
881
882 /* Set legacy DriveInfo fields */
883 dinfo->enable_auto_del = true;
884 dinfo->opts = all_opts;
885
886 dinfo->cyls = cyls;
887 dinfo->heads = heads;
888 dinfo->secs = secs;
889 dinfo->trans = translation;
890
891 dinfo->bus = bus_id;
892 dinfo->unit = unit_id;
893 dinfo->devaddr = devaddr;
894
895 switch(type) {
896 case IF_IDE:
897 case IF_SCSI:
898 case IF_XEN:
899 case IF_NONE:
900 dinfo->media_cd = media == MEDIA_CDROM;
901 break;
902 default:
903 break;
904 }
905
906 fail:
907 qemu_opts_del(legacy_opts);
908 return dinfo;
909 }
910
911 void do_commit(Monitor *mon, const QDict *qdict)
912 {
913 const char *device = qdict_get_str(qdict, "device");
914 BlockDriverState *bs;
915 int ret;
916
917 if (!strcmp(device, "all")) {
918 ret = bdrv_commit_all();
919 } else {
920 bs = bdrv_find(device);
921 if (!bs) {
922 monitor_printf(mon, "Device '%s' not found\n", device);
923 return;
924 }
925 ret = bdrv_commit(bs);
926 }
927 if (ret < 0) {
928 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
929 strerror(-ret));
930 }
931 }
932
933 static void blockdev_do_action(int kind, void *data, Error **errp)
934 {
935 TransactionAction action;
936 TransactionActionList list;
937
938 action.kind = kind;
939 action.data = data;
940 list.value = &action;
941 list.next = NULL;
942 qmp_transaction(&list, errp);
943 }
944
945 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
946 bool has_format, const char *format,
947 bool has_mode, enum NewImageMode mode,
948 Error **errp)
949 {
950 BlockdevSnapshot snapshot = {
951 .device = (char *) device,
952 .snapshot_file = (char *) snapshot_file,
953 .has_format = has_format,
954 .format = (char *) format,
955 .has_mode = has_mode,
956 .mode = mode,
957 };
958 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
959 &snapshot, errp);
960 }
961
962 void qmp_blockdev_snapshot_internal_sync(const char *device,
963 const char *name,
964 Error **errp)
965 {
966 BlockdevSnapshotInternal snapshot = {
967 .device = (char *) device,
968 .name = (char *) name
969 };
970
971 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
972 &snapshot, errp);
973 }
974
975 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
976 bool has_id,
977 const char *id,
978 bool has_name,
979 const char *name,
980 Error **errp)
981 {
982 BlockDriverState *bs = bdrv_find(device);
983 QEMUSnapshotInfo sn;
984 Error *local_err = NULL;
985 SnapshotInfo *info = NULL;
986 int ret;
987
988 if (!bs) {
989 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
990 return NULL;
991 }
992
993 if (!has_id) {
994 id = NULL;
995 }
996
997 if (!has_name) {
998 name = NULL;
999 }
1000
1001 if (!id && !name) {
1002 error_setg(errp, "Name or id must be provided");
1003 return NULL;
1004 }
1005
1006 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1007 if (error_is_set(&local_err)) {
1008 error_propagate(errp, local_err);
1009 return NULL;
1010 }
1011 if (!ret) {
1012 error_setg(errp,
1013 "Snapshot with id '%s' and name '%s' does not exist on "
1014 "device '%s'",
1015 STR_OR_NULL(id), STR_OR_NULL(name), device);
1016 return NULL;
1017 }
1018
1019 bdrv_snapshot_delete(bs, id, name, &local_err);
1020 if (error_is_set(&local_err)) {
1021 error_propagate(errp, local_err);
1022 return NULL;
1023 }
1024
1025 info = g_malloc0(sizeof(SnapshotInfo));
1026 info->id = g_strdup(sn.id_str);
1027 info->name = g_strdup(sn.name);
1028 info->date_nsec = sn.date_nsec;
1029 info->date_sec = sn.date_sec;
1030 info->vm_state_size = sn.vm_state_size;
1031 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1032 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1033
1034 return info;
1035 }
1036
1037 /* New and old BlockDriverState structs for group snapshots */
1038
1039 typedef struct BlkTransactionState BlkTransactionState;
1040
1041 /* Only prepare() may fail. In a single transaction, only one of commit() or
1042 abort() will be called, clean() will always be called if it present. */
1043 typedef struct BdrvActionOps {
1044 /* Size of state struct, in bytes. */
1045 size_t instance_size;
1046 /* Prepare the work, must NOT be NULL. */
1047 void (*prepare)(BlkTransactionState *common, Error **errp);
1048 /* Commit the changes, can be NULL. */
1049 void (*commit)(BlkTransactionState *common);
1050 /* Abort the changes on fail, can be NULL. */
1051 void (*abort)(BlkTransactionState *common);
1052 /* Clean up resource in the end, can be NULL. */
1053 void (*clean)(BlkTransactionState *common);
1054 } BdrvActionOps;
1055
1056 /*
1057 * This structure must be arranged as first member in child type, assuming
1058 * that compiler will also arrange it to the same address with parent instance.
1059 * Later it will be used in free().
1060 */
1061 struct BlkTransactionState {
1062 TransactionAction *action;
1063 const BdrvActionOps *ops;
1064 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1065 };
1066
1067 /* internal snapshot private data */
1068 typedef struct InternalSnapshotState {
1069 BlkTransactionState common;
1070 BlockDriverState *bs;
1071 QEMUSnapshotInfo sn;
1072 } InternalSnapshotState;
1073
1074 static void internal_snapshot_prepare(BlkTransactionState *common,
1075 Error **errp)
1076 {
1077 const char *device;
1078 const char *name;
1079 BlockDriverState *bs;
1080 QEMUSnapshotInfo old_sn, *sn;
1081 bool ret;
1082 qemu_timeval tv;
1083 BlockdevSnapshotInternal *internal;
1084 InternalSnapshotState *state;
1085 int ret1;
1086
1087 g_assert(common->action->kind ==
1088 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1089 internal = common->action->blockdev_snapshot_internal_sync;
1090 state = DO_UPCAST(InternalSnapshotState, common, common);
1091
1092 /* 1. parse input */
1093 device = internal->device;
1094 name = internal->name;
1095
1096 /* 2. check for validation */
1097 bs = bdrv_find(device);
1098 if (!bs) {
1099 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1100 return;
1101 }
1102
1103 if (!bdrv_is_inserted(bs)) {
1104 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1105 return;
1106 }
1107
1108 if (bdrv_is_read_only(bs)) {
1109 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1110 return;
1111 }
1112
1113 if (!bdrv_can_snapshot(bs)) {
1114 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1115 bs->drv->format_name, device, "internal snapshot");
1116 return;
1117 }
1118
1119 if (!strlen(name)) {
1120 error_setg(errp, "Name is empty");
1121 return;
1122 }
1123
1124 /* check whether a snapshot with name exist */
1125 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
1126 if (error_is_set(errp)) {
1127 return;
1128 } else if (ret) {
1129 error_setg(errp,
1130 "Snapshot with name '%s' already exists on device '%s'",
1131 name, device);
1132 return;
1133 }
1134
1135 /* 3. take the snapshot */
1136 sn = &state->sn;
1137 pstrcpy(sn->name, sizeof(sn->name), name);
1138 qemu_gettimeofday(&tv);
1139 sn->date_sec = tv.tv_sec;
1140 sn->date_nsec = tv.tv_usec * 1000;
1141 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1142
1143 ret1 = bdrv_snapshot_create(bs, sn);
1144 if (ret1 < 0) {
1145 error_setg_errno(errp, -ret1,
1146 "Failed to create snapshot '%s' on device '%s'",
1147 name, device);
1148 return;
1149 }
1150
1151 /* 4. succeed, mark a snapshot is created */
1152 state->bs = bs;
1153 }
1154
1155 static void internal_snapshot_abort(BlkTransactionState *common)
1156 {
1157 InternalSnapshotState *state =
1158 DO_UPCAST(InternalSnapshotState, common, common);
1159 BlockDriverState *bs = state->bs;
1160 QEMUSnapshotInfo *sn = &state->sn;
1161 Error *local_error = NULL;
1162
1163 if (!bs) {
1164 return;
1165 }
1166
1167 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1168 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1169 "device '%s' in abort: %s",
1170 sn->id_str,
1171 sn->name,
1172 bdrv_get_device_name(bs),
1173 error_get_pretty(local_error));
1174 error_free(local_error);
1175 }
1176 }
1177
1178 /* external snapshot private data */
1179 typedef struct ExternalSnapshotState {
1180 BlkTransactionState common;
1181 BlockDriverState *old_bs;
1182 BlockDriverState *new_bs;
1183 } ExternalSnapshotState;
1184
1185 static void external_snapshot_prepare(BlkTransactionState *common,
1186 Error **errp)
1187 {
1188 BlockDriver *drv;
1189 int flags, ret;
1190 Error *local_err = NULL;
1191 const char *device;
1192 const char *new_image_file;
1193 const char *format = "qcow2";
1194 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1195 ExternalSnapshotState *state =
1196 DO_UPCAST(ExternalSnapshotState, common, common);
1197 TransactionAction *action = common->action;
1198
1199 /* get parameters */
1200 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1201
1202 device = action->blockdev_snapshot_sync->device;
1203 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1204 if (action->blockdev_snapshot_sync->has_format) {
1205 format = action->blockdev_snapshot_sync->format;
1206 }
1207 if (action->blockdev_snapshot_sync->has_mode) {
1208 mode = action->blockdev_snapshot_sync->mode;
1209 }
1210
1211 /* start processing */
1212 drv = bdrv_find_format(format);
1213 if (!drv) {
1214 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1215 return;
1216 }
1217
1218 state->old_bs = bdrv_find(device);
1219 if (!state->old_bs) {
1220 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1221 return;
1222 }
1223
1224 if (!bdrv_is_inserted(state->old_bs)) {
1225 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1226 return;
1227 }
1228
1229 if (bdrv_in_use(state->old_bs)) {
1230 error_set(errp, QERR_DEVICE_IN_USE, device);
1231 return;
1232 }
1233
1234 if (!bdrv_is_read_only(state->old_bs)) {
1235 if (bdrv_flush(state->old_bs)) {
1236 error_set(errp, QERR_IO_ERROR);
1237 return;
1238 }
1239 }
1240
1241 if (bdrv_check_ext_snapshot(state->old_bs) != EXT_SNAPSHOT_ALLOWED) {
1242 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1243 return;
1244 }
1245
1246 flags = state->old_bs->open_flags;
1247
1248 /* create new image w/backing file */
1249 if (mode != NEW_IMAGE_MODE_EXISTING) {
1250 bdrv_img_create(new_image_file, format,
1251 state->old_bs->filename,
1252 state->old_bs->drv->format_name,
1253 NULL, -1, flags, &local_err, false);
1254 if (error_is_set(&local_err)) {
1255 error_propagate(errp, local_err);
1256 return;
1257 }
1258 }
1259
1260 /* We will manually add the backing_hd field to the bs later */
1261 state->new_bs = bdrv_new("");
1262 /* TODO Inherit bs->options or only take explicit options with an
1263 * extended QMP command? */
1264 ret = bdrv_open(state->new_bs, new_image_file, NULL,
1265 flags | BDRV_O_NO_BACKING, drv, &local_err);
1266 if (ret != 0) {
1267 error_propagate(errp, local_err);
1268 }
1269 }
1270
1271 static void external_snapshot_commit(BlkTransactionState *common)
1272 {
1273 ExternalSnapshotState *state =
1274 DO_UPCAST(ExternalSnapshotState, common, common);
1275
1276 /* This removes our old bs and adds the new bs */
1277 bdrv_append(state->new_bs, state->old_bs);
1278 /* We don't need (or want) to use the transactional
1279 * bdrv_reopen_multiple() across all the entries at once, because we
1280 * don't want to abort all of them if one of them fails the reopen */
1281 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1282 NULL);
1283 }
1284
1285 static void external_snapshot_abort(BlkTransactionState *common)
1286 {
1287 ExternalSnapshotState *state =
1288 DO_UPCAST(ExternalSnapshotState, common, common);
1289 if (state->new_bs) {
1290 bdrv_unref(state->new_bs);
1291 }
1292 }
1293
1294 typedef struct DriveBackupState {
1295 BlkTransactionState common;
1296 BlockDriverState *bs;
1297 BlockJob *job;
1298 } DriveBackupState;
1299
1300 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1301 {
1302 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1303 DriveBackup *backup;
1304 Error *local_err = NULL;
1305
1306 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1307 backup = common->action->drive_backup;
1308
1309 qmp_drive_backup(backup->device, backup->target,
1310 backup->has_format, backup->format,
1311 backup->sync,
1312 backup->has_mode, backup->mode,
1313 backup->has_speed, backup->speed,
1314 backup->has_on_source_error, backup->on_source_error,
1315 backup->has_on_target_error, backup->on_target_error,
1316 &local_err);
1317 if (error_is_set(&local_err)) {
1318 error_propagate(errp, local_err);
1319 state->bs = NULL;
1320 state->job = NULL;
1321 return;
1322 }
1323
1324 state->bs = bdrv_find(backup->device);
1325 state->job = state->bs->job;
1326 }
1327
1328 static void drive_backup_abort(BlkTransactionState *common)
1329 {
1330 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1331 BlockDriverState *bs = state->bs;
1332
1333 /* Only cancel if it's the job we started */
1334 if (bs && bs->job && bs->job == state->job) {
1335 block_job_cancel_sync(bs->job);
1336 }
1337 }
1338
1339 static void abort_prepare(BlkTransactionState *common, Error **errp)
1340 {
1341 error_setg(errp, "Transaction aborted using Abort action");
1342 }
1343
1344 static void abort_commit(BlkTransactionState *common)
1345 {
1346 g_assert_not_reached(); /* this action never succeeds */
1347 }
1348
1349 static const BdrvActionOps actions[] = {
1350 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1351 .instance_size = sizeof(ExternalSnapshotState),
1352 .prepare = external_snapshot_prepare,
1353 .commit = external_snapshot_commit,
1354 .abort = external_snapshot_abort,
1355 },
1356 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1357 .instance_size = sizeof(DriveBackupState),
1358 .prepare = drive_backup_prepare,
1359 .abort = drive_backup_abort,
1360 },
1361 [TRANSACTION_ACTION_KIND_ABORT] = {
1362 .instance_size = sizeof(BlkTransactionState),
1363 .prepare = abort_prepare,
1364 .commit = abort_commit,
1365 },
1366 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1367 .instance_size = sizeof(InternalSnapshotState),
1368 .prepare = internal_snapshot_prepare,
1369 .abort = internal_snapshot_abort,
1370 },
1371 };
1372
1373 /*
1374 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1375 * then we do not pivot any of the devices in the group, and abandon the
1376 * snapshots
1377 */
1378 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1379 {
1380 TransactionActionList *dev_entry = dev_list;
1381 BlkTransactionState *state, *next;
1382 Error *local_err = NULL;
1383
1384 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1385 QSIMPLEQ_INIT(&snap_bdrv_states);
1386
1387 /* drain all i/o before any snapshots */
1388 bdrv_drain_all();
1389
1390 /* We don't do anything in this loop that commits us to the snapshot */
1391 while (NULL != dev_entry) {
1392 TransactionAction *dev_info = NULL;
1393 const BdrvActionOps *ops;
1394
1395 dev_info = dev_entry->value;
1396 dev_entry = dev_entry->next;
1397
1398 assert(dev_info->kind < ARRAY_SIZE(actions));
1399
1400 ops = &actions[dev_info->kind];
1401 assert(ops->instance_size > 0);
1402
1403 state = g_malloc0(ops->instance_size);
1404 state->ops = ops;
1405 state->action = dev_info;
1406 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1407
1408 state->ops->prepare(state, &local_err);
1409 if (error_is_set(&local_err)) {
1410 error_propagate(errp, local_err);
1411 goto delete_and_fail;
1412 }
1413 }
1414
1415 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1416 if (state->ops->commit) {
1417 state->ops->commit(state);
1418 }
1419 }
1420
1421 /* success */
1422 goto exit;
1423
1424 delete_and_fail:
1425 /*
1426 * failure, and it is all-or-none; abandon each new bs, and keep using
1427 * the original bs for all images
1428 */
1429 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1430 if (state->ops->abort) {
1431 state->ops->abort(state);
1432 }
1433 }
1434 exit:
1435 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1436 if (state->ops->clean) {
1437 state->ops->clean(state);
1438 }
1439 g_free(state);
1440 }
1441 }
1442
1443
1444 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1445 {
1446 if (bdrv_in_use(bs)) {
1447 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1448 return;
1449 }
1450 if (!bdrv_dev_has_removable_media(bs)) {
1451 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1452 return;
1453 }
1454
1455 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1456 bdrv_dev_eject_request(bs, force);
1457 if (!force) {
1458 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1459 return;
1460 }
1461 }
1462
1463 bdrv_close(bs);
1464 }
1465
1466 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1467 {
1468 BlockDriverState *bs;
1469
1470 bs = bdrv_find(device);
1471 if (!bs) {
1472 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1473 return;
1474 }
1475
1476 eject_device(bs, force, errp);
1477 }
1478
1479 void qmp_block_passwd(const char *device, const char *password, Error **errp)
1480 {
1481 BlockDriverState *bs;
1482 int err;
1483
1484 bs = bdrv_find(device);
1485 if (!bs) {
1486 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1487 return;
1488 }
1489
1490 err = bdrv_set_key(bs, password);
1491 if (err == -EINVAL) {
1492 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1493 return;
1494 } else if (err < 0) {
1495 error_set(errp, QERR_INVALID_PASSWORD);
1496 return;
1497 }
1498 }
1499
1500 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1501 int bdrv_flags, BlockDriver *drv,
1502 const char *password, Error **errp)
1503 {
1504 Error *local_err = NULL;
1505 int ret;
1506
1507 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
1508 if (ret < 0) {
1509 error_propagate(errp, local_err);
1510 return;
1511 }
1512
1513 if (bdrv_key_required(bs)) {
1514 if (password) {
1515 if (bdrv_set_key(bs, password) < 0) {
1516 error_set(errp, QERR_INVALID_PASSWORD);
1517 }
1518 } else {
1519 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1520 bdrv_get_encrypted_filename(bs));
1521 }
1522 } else if (password) {
1523 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1524 }
1525 }
1526
1527 void qmp_change_blockdev(const char *device, const char *filename,
1528 const char *format, Error **errp)
1529 {
1530 BlockDriverState *bs;
1531 BlockDriver *drv = NULL;
1532 int bdrv_flags;
1533 Error *err = NULL;
1534
1535 bs = bdrv_find(device);
1536 if (!bs) {
1537 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1538 return;
1539 }
1540
1541 if (format) {
1542 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1543 if (!drv) {
1544 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1545 return;
1546 }
1547 }
1548
1549 eject_device(bs, 0, &err);
1550 if (error_is_set(&err)) {
1551 error_propagate(errp, err);
1552 return;
1553 }
1554
1555 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1556 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1557
1558 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1559 }
1560
1561 /* throttling disk I/O limits */
1562 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1563 int64_t bps_wr,
1564 int64_t iops,
1565 int64_t iops_rd,
1566 int64_t iops_wr,
1567 bool has_bps_max,
1568 int64_t bps_max,
1569 bool has_bps_rd_max,
1570 int64_t bps_rd_max,
1571 bool has_bps_wr_max,
1572 int64_t bps_wr_max,
1573 bool has_iops_max,
1574 int64_t iops_max,
1575 bool has_iops_rd_max,
1576 int64_t iops_rd_max,
1577 bool has_iops_wr_max,
1578 int64_t iops_wr_max,
1579 bool has_iops_size,
1580 int64_t iops_size, Error **errp)
1581 {
1582 ThrottleConfig cfg;
1583 BlockDriverState *bs;
1584
1585 bs = bdrv_find(device);
1586 if (!bs) {
1587 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1588 return;
1589 }
1590
1591 memset(&cfg, 0, sizeof(cfg));
1592 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1593 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1594 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1595
1596 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1597 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1598 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1599
1600 if (has_bps_max) {
1601 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1602 }
1603 if (has_bps_rd_max) {
1604 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1605 }
1606 if (has_bps_wr_max) {
1607 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1608 }
1609 if (has_iops_max) {
1610 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1611 }
1612 if (has_iops_rd_max) {
1613 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1614 }
1615 if (has_iops_wr_max) {
1616 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1617 }
1618
1619 if (has_iops_size) {
1620 cfg.op_size = iops_size;
1621 }
1622
1623 if (!check_throttle_config(&cfg, errp)) {
1624 return;
1625 }
1626
1627 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1628 bdrv_io_limits_enable(bs);
1629 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1630 bdrv_io_limits_disable(bs);
1631 }
1632
1633 if (bs->io_limits_enabled) {
1634 bdrv_set_io_limits(bs, &cfg);
1635 }
1636 }
1637
1638 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1639 {
1640 const char *id = qdict_get_str(qdict, "id");
1641 BlockDriverState *bs;
1642
1643 bs = bdrv_find(id);
1644 if (!bs) {
1645 qerror_report(QERR_DEVICE_NOT_FOUND, id);
1646 return -1;
1647 }
1648 if (bdrv_in_use(bs)) {
1649 qerror_report(QERR_DEVICE_IN_USE, id);
1650 return -1;
1651 }
1652
1653 /* quiesce block driver; prevent further io */
1654 bdrv_drain_all();
1655 bdrv_flush(bs);
1656 bdrv_close(bs);
1657
1658 /* if we have a device attached to this BlockDriverState
1659 * then we need to make the drive anonymous until the device
1660 * can be removed. If this is a drive with no device backing
1661 * then we can just get rid of the block driver state right here.
1662 */
1663 if (bdrv_get_attached_dev(bs)) {
1664 bdrv_make_anon(bs);
1665
1666 /* Further I/O must not pause the guest */
1667 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1668 BLOCKDEV_ON_ERROR_REPORT);
1669 } else {
1670 drive_uninit(drive_get_by_blockdev(bs));
1671 }
1672
1673 return 0;
1674 }
1675
1676 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1677 {
1678 BlockDriverState *bs;
1679 int ret;
1680
1681 bs = bdrv_find(device);
1682 if (!bs) {
1683 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1684 return;
1685 }
1686
1687 if (size < 0) {
1688 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1689 return;
1690 }
1691
1692 /* complete all in-flight operations before resizing the device */
1693 bdrv_drain_all();
1694
1695 ret = bdrv_truncate(bs, size);
1696 switch (ret) {
1697 case 0:
1698 break;
1699 case -ENOMEDIUM:
1700 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1701 break;
1702 case -ENOTSUP:
1703 error_set(errp, QERR_UNSUPPORTED);
1704 break;
1705 case -EACCES:
1706 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1707 break;
1708 case -EBUSY:
1709 error_set(errp, QERR_DEVICE_IN_USE, device);
1710 break;
1711 default:
1712 error_setg_errno(errp, -ret, "Could not resize");
1713 break;
1714 }
1715 }
1716
1717 static void block_job_cb(void *opaque, int ret)
1718 {
1719 BlockDriverState *bs = opaque;
1720 QObject *obj;
1721
1722 trace_block_job_cb(bs, bs->job, ret);
1723
1724 assert(bs->job);
1725 obj = qobject_from_block_job(bs->job);
1726 if (ret < 0) {
1727 QDict *dict = qobject_to_qdict(obj);
1728 qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1729 }
1730
1731 if (block_job_is_cancelled(bs->job)) {
1732 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1733 } else {
1734 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1735 }
1736 qobject_decref(obj);
1737
1738 bdrv_put_ref_bh_schedule(bs);
1739 }
1740
1741 void qmp_block_stream(const char *device, bool has_base,
1742 const char *base, bool has_speed, int64_t speed,
1743 bool has_on_error, BlockdevOnError on_error,
1744 Error **errp)
1745 {
1746 BlockDriverState *bs;
1747 BlockDriverState *base_bs = NULL;
1748 Error *local_err = NULL;
1749
1750 if (!has_on_error) {
1751 on_error = BLOCKDEV_ON_ERROR_REPORT;
1752 }
1753
1754 bs = bdrv_find(device);
1755 if (!bs) {
1756 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1757 return;
1758 }
1759
1760 if (base) {
1761 base_bs = bdrv_find_backing_image(bs, base);
1762 if (base_bs == NULL) {
1763 error_set(errp, QERR_BASE_NOT_FOUND, base);
1764 return;
1765 }
1766 }
1767
1768 stream_start(bs, base_bs, base, has_speed ? speed : 0,
1769 on_error, block_job_cb, bs, &local_err);
1770 if (error_is_set(&local_err)) {
1771 error_propagate(errp, local_err);
1772 return;
1773 }
1774
1775 trace_qmp_block_stream(bs, bs->job);
1776 }
1777
1778 void qmp_block_commit(const char *device,
1779 bool has_base, const char *base, const char *top,
1780 bool has_speed, int64_t speed,
1781 Error **errp)
1782 {
1783 BlockDriverState *bs;
1784 BlockDriverState *base_bs, *top_bs;
1785 Error *local_err = NULL;
1786 /* This will be part of the QMP command, if/when the
1787 * BlockdevOnError change for blkmirror makes it in
1788 */
1789 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1790
1791 /* drain all i/o before commits */
1792 bdrv_drain_all();
1793
1794 bs = bdrv_find(device);
1795 if (!bs) {
1796 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1797 return;
1798 }
1799
1800 /* default top_bs is the active layer */
1801 top_bs = bs;
1802
1803 if (top) {
1804 if (strcmp(bs->filename, top) != 0) {
1805 top_bs = bdrv_find_backing_image(bs, top);
1806 }
1807 }
1808
1809 if (top_bs == NULL) {
1810 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1811 return;
1812 }
1813
1814 if (has_base && base) {
1815 base_bs = bdrv_find_backing_image(top_bs, base);
1816 } else {
1817 base_bs = bdrv_find_base(top_bs);
1818 }
1819
1820 if (base_bs == NULL) {
1821 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1822 return;
1823 }
1824
1825 if (top_bs == bs) {
1826 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
1827 bs, &local_err);
1828 } else {
1829 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1830 &local_err);
1831 }
1832 if (local_err != NULL) {
1833 error_propagate(errp, local_err);
1834 return;
1835 }
1836 }
1837
1838 void qmp_drive_backup(const char *device, const char *target,
1839 bool has_format, const char *format,
1840 enum MirrorSyncMode sync,
1841 bool has_mode, enum NewImageMode mode,
1842 bool has_speed, int64_t speed,
1843 bool has_on_source_error, BlockdevOnError on_source_error,
1844 bool has_on_target_error, BlockdevOnError on_target_error,
1845 Error **errp)
1846 {
1847 BlockDriverState *bs;
1848 BlockDriverState *target_bs;
1849 BlockDriverState *source = NULL;
1850 BlockDriver *drv = NULL;
1851 Error *local_err = NULL;
1852 int flags;
1853 int64_t size;
1854 int ret;
1855
1856 if (!has_speed) {
1857 speed = 0;
1858 }
1859 if (!has_on_source_error) {
1860 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1861 }
1862 if (!has_on_target_error) {
1863 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1864 }
1865 if (!has_mode) {
1866 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1867 }
1868
1869 bs = bdrv_find(device);
1870 if (!bs) {
1871 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1872 return;
1873 }
1874
1875 if (!bdrv_is_inserted(bs)) {
1876 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1877 return;
1878 }
1879
1880 if (!has_format) {
1881 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1882 }
1883 if (format) {
1884 drv = bdrv_find_format(format);
1885 if (!drv) {
1886 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1887 return;
1888 }
1889 }
1890
1891 if (bdrv_in_use(bs)) {
1892 error_set(errp, QERR_DEVICE_IN_USE, device);
1893 return;
1894 }
1895
1896 flags = bs->open_flags | BDRV_O_RDWR;
1897
1898 /* See if we have a backing HD we can use to create our new image
1899 * on top of. */
1900 if (sync == MIRROR_SYNC_MODE_TOP) {
1901 source = bs->backing_hd;
1902 if (!source) {
1903 sync = MIRROR_SYNC_MODE_FULL;
1904 }
1905 }
1906 if (sync == MIRROR_SYNC_MODE_NONE) {
1907 source = bs;
1908 }
1909
1910 size = bdrv_getlength(bs);
1911 if (size < 0) {
1912 error_setg_errno(errp, -size, "bdrv_getlength failed");
1913 return;
1914 }
1915
1916 if (mode != NEW_IMAGE_MODE_EXISTING) {
1917 assert(format && drv);
1918 if (source) {
1919 bdrv_img_create(target, format, source->filename,
1920 source->drv->format_name, NULL,
1921 size, flags, &local_err, false);
1922 } else {
1923 bdrv_img_create(target, format, NULL, NULL, NULL,
1924 size, flags, &local_err, false);
1925 }
1926 }
1927
1928 if (error_is_set(&local_err)) {
1929 error_propagate(errp, local_err);
1930 return;
1931 }
1932
1933 target_bs = bdrv_new("");
1934 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
1935 if (ret < 0) {
1936 bdrv_unref(target_bs);
1937 error_propagate(errp, local_err);
1938 return;
1939 }
1940
1941 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1942 block_job_cb, bs, &local_err);
1943 if (local_err != NULL) {
1944 bdrv_unref(target_bs);
1945 error_propagate(errp, local_err);
1946 return;
1947 }
1948 }
1949
1950 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
1951
1952 void qmp_drive_mirror(const char *device, const char *target,
1953 bool has_format, const char *format,
1954 enum MirrorSyncMode sync,
1955 bool has_mode, enum NewImageMode mode,
1956 bool has_speed, int64_t speed,
1957 bool has_granularity, uint32_t granularity,
1958 bool has_buf_size, int64_t buf_size,
1959 bool has_on_source_error, BlockdevOnError on_source_error,
1960 bool has_on_target_error, BlockdevOnError on_target_error,
1961 Error **errp)
1962 {
1963 BlockDriverState *bs;
1964 BlockDriverState *source, *target_bs;
1965 BlockDriver *drv = NULL;
1966 Error *local_err = NULL;
1967 int flags;
1968 int64_t size;
1969 int ret;
1970
1971 if (!has_speed) {
1972 speed = 0;
1973 }
1974 if (!has_on_source_error) {
1975 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1976 }
1977 if (!has_on_target_error) {
1978 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1979 }
1980 if (!has_mode) {
1981 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1982 }
1983 if (!has_granularity) {
1984 granularity = 0;
1985 }
1986 if (!has_buf_size) {
1987 buf_size = DEFAULT_MIRROR_BUF_SIZE;
1988 }
1989
1990 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1991 error_set(errp, QERR_INVALID_PARAMETER, device);
1992 return;
1993 }
1994 if (granularity & (granularity - 1)) {
1995 error_set(errp, QERR_INVALID_PARAMETER, device);
1996 return;
1997 }
1998
1999 bs = bdrv_find(device);
2000 if (!bs) {
2001 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2002 return;
2003 }
2004
2005 if (!bdrv_is_inserted(bs)) {
2006 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2007 return;
2008 }
2009
2010 if (!has_format) {
2011 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2012 }
2013 if (format) {
2014 drv = bdrv_find_format(format);
2015 if (!drv) {
2016 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2017 return;
2018 }
2019 }
2020
2021 if (bdrv_in_use(bs)) {
2022 error_set(errp, QERR_DEVICE_IN_USE, device);
2023 return;
2024 }
2025
2026 flags = bs->open_flags | BDRV_O_RDWR;
2027 source = bs->backing_hd;
2028 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2029 sync = MIRROR_SYNC_MODE_FULL;
2030 }
2031 if (sync == MIRROR_SYNC_MODE_NONE) {
2032 source = bs;
2033 }
2034
2035 size = bdrv_getlength(bs);
2036 if (size < 0) {
2037 error_setg_errno(errp, -size, "bdrv_getlength failed");
2038 return;
2039 }
2040
2041 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2042 && mode != NEW_IMAGE_MODE_EXISTING)
2043 {
2044 /* create new image w/o backing file */
2045 assert(format && drv);
2046 bdrv_img_create(target, format,
2047 NULL, NULL, NULL, size, flags, &local_err, false);
2048 } else {
2049 switch (mode) {
2050 case NEW_IMAGE_MODE_EXISTING:
2051 break;
2052 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2053 /* create new image with backing file */
2054 bdrv_img_create(target, format,
2055 source->filename,
2056 source->drv->format_name,
2057 NULL, size, flags, &local_err, false);
2058 break;
2059 default:
2060 abort();
2061 }
2062 }
2063
2064 if (error_is_set(&local_err)) {
2065 error_propagate(errp, local_err);
2066 return;
2067 }
2068
2069 /* Mirroring takes care of copy-on-write using the source's backing
2070 * file.
2071 */
2072 target_bs = bdrv_new("");
2073 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
2074 &local_err);
2075 if (ret < 0) {
2076 bdrv_unref(target_bs);
2077 error_propagate(errp, local_err);
2078 return;
2079 }
2080
2081 mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
2082 on_source_error, on_target_error,
2083 block_job_cb, bs, &local_err);
2084 if (local_err != NULL) {
2085 bdrv_unref(target_bs);
2086 error_propagate(errp, local_err);
2087 return;
2088 }
2089 }
2090
2091 static BlockJob *find_block_job(const char *device)
2092 {
2093 BlockDriverState *bs;
2094
2095 bs = bdrv_find(device);
2096 if (!bs || !bs->job) {
2097 return NULL;
2098 }
2099 return bs->job;
2100 }
2101
2102 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2103 {
2104 BlockJob *job = find_block_job(device);
2105
2106 if (!job) {
2107 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2108 return;
2109 }
2110
2111 block_job_set_speed(job, speed, errp);
2112 }
2113
2114 void qmp_block_job_cancel(const char *device,
2115 bool has_force, bool force, Error **errp)
2116 {
2117 BlockJob *job = find_block_job(device);
2118
2119 if (!has_force) {
2120 force = false;
2121 }
2122
2123 if (!job) {
2124 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2125 return;
2126 }
2127 if (job->paused && !force) {
2128 error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
2129 return;
2130 }
2131
2132 trace_qmp_block_job_cancel(job);
2133 block_job_cancel(job);
2134 }
2135
2136 void qmp_block_job_pause(const char *device, Error **errp)
2137 {
2138 BlockJob *job = find_block_job(device);
2139
2140 if (!job) {
2141 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2142 return;
2143 }
2144
2145 trace_qmp_block_job_pause(job);
2146 block_job_pause(job);
2147 }
2148
2149 void qmp_block_job_resume(const char *device, Error **errp)
2150 {
2151 BlockJob *job = find_block_job(device);
2152
2153 if (!job) {
2154 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2155 return;
2156 }
2157
2158 trace_qmp_block_job_resume(job);
2159 block_job_resume(job);
2160 }
2161
2162 void qmp_block_job_complete(const char *device, Error **errp)
2163 {
2164 BlockJob *job = find_block_job(device);
2165
2166 if (!job) {
2167 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2168 return;
2169 }
2170
2171 trace_qmp_block_job_complete(job);
2172 block_job_complete(job, errp);
2173 }
2174
2175 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2176 {
2177 QmpOutputVisitor *ov = qmp_output_visitor_new();
2178 QObject *obj;
2179 QDict *qdict;
2180 Error *local_err = NULL;
2181
2182 /* Require an ID in the top level */
2183 if (!options->has_id) {
2184 error_setg(errp, "Block device needs an ID");
2185 goto fail;
2186 }
2187
2188 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with
2189 * cache.direct=false instead of silently switching to aio=threads, except
2190 * if called from drive_init.
2191 *
2192 * For now, simply forbidding the combination for all drivers will do. */
2193 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2194 bool direct = options->cache->has_direct && options->cache->direct;
2195 if (!options->has_cache && !direct) {
2196 error_setg(errp, "aio=native requires cache.direct=true");
2197 goto fail;
2198 }
2199 }
2200
2201 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2202 &options, NULL, &local_err);
2203 if (error_is_set(&local_err)) {
2204 error_propagate(errp, local_err);
2205 goto fail;
2206 }
2207
2208 obj = qmp_output_get_qobject(ov);
2209 qdict = qobject_to_qdict(obj);
2210
2211 qdict_flatten(qdict);
2212
2213 blockdev_init(qdict, IF_NONE, &local_err);
2214 if (error_is_set(&local_err)) {
2215 error_propagate(errp, local_err);
2216 goto fail;
2217 }
2218
2219 fail:
2220 qmp_output_visitor_cleanup(ov);
2221 }
2222
2223 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2224 {
2225 BlockJobInfoList **prev = opaque;
2226 BlockJob *job = bs->job;
2227
2228 if (job) {
2229 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2230 elem->value = block_job_query(bs->job);
2231 (*prev)->next = elem;
2232 *prev = elem;
2233 }
2234 }
2235
2236 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2237 {
2238 /* Dummy is a fake list element for holding the head pointer */
2239 BlockJobInfoList dummy = {};
2240 BlockJobInfoList *prev = &dummy;
2241 bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2242 return dummy.next;
2243 }
2244
2245 QemuOptsList qemu_common_drive_opts = {
2246 .name = "drive",
2247 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2248 .desc = {
2249 {
2250 .name = "snapshot",
2251 .type = QEMU_OPT_BOOL,
2252 .help = "enable/disable snapshot mode",
2253 },{
2254 .name = "file",
2255 .type = QEMU_OPT_STRING,
2256 .help = "disk image",
2257 },{
2258 .name = "discard",
2259 .type = QEMU_OPT_STRING,
2260 .help = "discard operation (ignore/off, unmap/on)",
2261 },{
2262 .name = "cache.writeback",
2263 .type = QEMU_OPT_BOOL,
2264 .help = "enables writeback mode for any caches",
2265 },{
2266 .name = "cache.direct",
2267 .type = QEMU_OPT_BOOL,
2268 .help = "enables use of O_DIRECT (bypass the host page cache)",
2269 },{
2270 .name = "cache.no-flush",
2271 .type = QEMU_OPT_BOOL,
2272 .help = "ignore any flush requests for the device",
2273 },{
2274 .name = "aio",
2275 .type = QEMU_OPT_STRING,
2276 .help = "host AIO implementation (threads, native)",
2277 },{
2278 .name = "format",
2279 .type = QEMU_OPT_STRING,
2280 .help = "disk format (raw, qcow2, ...)",
2281 },{
2282 .name = "serial",
2283 .type = QEMU_OPT_STRING,
2284 .help = "disk serial number",
2285 },{
2286 .name = "rerror",
2287 .type = QEMU_OPT_STRING,
2288 .help = "read error action",
2289 },{
2290 .name = "werror",
2291 .type = QEMU_OPT_STRING,
2292 .help = "write error action",
2293 },{
2294 .name = "read-only",
2295 .type = QEMU_OPT_BOOL,
2296 .help = "open drive file as read-only",
2297 },{
2298 .name = "throttling.iops-total",
2299 .type = QEMU_OPT_NUMBER,
2300 .help = "limit total I/O operations per second",
2301 },{
2302 .name = "throttling.iops-read",
2303 .type = QEMU_OPT_NUMBER,
2304 .help = "limit read operations per second",
2305 },{
2306 .name = "throttling.iops-write",
2307 .type = QEMU_OPT_NUMBER,
2308 .help = "limit write operations per second",
2309 },{
2310 .name = "throttling.bps-total",
2311 .type = QEMU_OPT_NUMBER,
2312 .help = "limit total bytes per second",
2313 },{
2314 .name = "throttling.bps-read",
2315 .type = QEMU_OPT_NUMBER,
2316 .help = "limit read bytes per second",
2317 },{
2318 .name = "throttling.bps-write",
2319 .type = QEMU_OPT_NUMBER,
2320 .help = "limit write bytes per second",
2321 },{
2322 .name = "throttling.iops-total-max",
2323 .type = QEMU_OPT_NUMBER,
2324 .help = "I/O operations burst",
2325 },{
2326 .name = "throttling.iops-read-max",
2327 .type = QEMU_OPT_NUMBER,
2328 .help = "I/O operations read burst",
2329 },{
2330 .name = "throttling.iops-write-max",
2331 .type = QEMU_OPT_NUMBER,
2332 .help = "I/O operations write burst",
2333 },{
2334 .name = "throttling.bps-total-max",
2335 .type = QEMU_OPT_NUMBER,
2336 .help = "total bytes burst",
2337 },{
2338 .name = "throttling.bps-read-max",
2339 .type = QEMU_OPT_NUMBER,
2340 .help = "total bytes read burst",
2341 },{
2342 .name = "throttling.bps-write-max",
2343 .type = QEMU_OPT_NUMBER,
2344 .help = "total bytes write burst",
2345 },{
2346 .name = "throttling.iops-size",
2347 .type = QEMU_OPT_NUMBER,
2348 .help = "when limiting by iops max size of an I/O in bytes",
2349 },{
2350 .name = "copy-on-read",
2351 .type = QEMU_OPT_BOOL,
2352 .help = "copy read data from backing file into image file",
2353 },
2354 { /* end of list */ }
2355 },
2356 };
2357
2358 QemuOptsList qemu_drive_opts = {
2359 .name = "drive",
2360 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2361 .desc = {
2362 /*
2363 * no elements => accept any params
2364 * validation will happen later
2365 */
2366 { /* end of list */ }
2367 },
2368 };
QEmu