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vmdk: Check for overhead when opening
[qemu/kevin.git] / blockdev.c
blob386109a8d4c054fb918cfb6f6f29c2d05fc282d4
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(const char *file, QDict *bs_opts,
311 BlockInterfaceType type,
312 Error **errp)
313 {
314 const char *buf;
315 const char *serial;
316 int ro = 0;
317 int bdrv_flags = 0;
318 int on_read_error, on_write_error;
319 DriveInfo *dinfo;
320 ThrottleConfig cfg;
321 int snapshot = 0;
322 bool copy_on_read;
323 int ret;
324 Error *error = NULL;
325 QemuOpts *opts;
326 const char *id;
327 bool has_driver_specific_opts;
328 BlockDriver *drv = NULL;
329
330 /* Check common options by copying from bs_opts to opts, all other options
331 * stay in bs_opts for processing by bdrv_open(). */
332 id = qdict_get_try_str(bs_opts, "id");
333 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
334 if (error_is_set(&error)) {
335 error_propagate(errp, error);
336 return NULL;
337 }
338
339 qemu_opts_absorb_qdict(opts, bs_opts, &error);
340 if (error_is_set(&error)) {
341 error_propagate(errp, error);
342 goto early_err;
343 }
344
345 if (id) {
346 qdict_del(bs_opts, "id");
347 }
348
349 has_driver_specific_opts = !!qdict_size(bs_opts);
350
351 /* extract parameters */
352 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
353 ro = qemu_opt_get_bool(opts, "read-only", 0);
354 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
355
356 serial = qemu_opt_get(opts, "serial");
357
358 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
359 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
360 error_setg(errp, "invalid discard option");
361 goto early_err;
362 }
363 }
364
365 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
366 bdrv_flags |= BDRV_O_CACHE_WB;
367 }
368 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
369 bdrv_flags |= BDRV_O_NOCACHE;
370 }
371 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
372 bdrv_flags |= BDRV_O_NO_FLUSH;
373 }
374
375 #ifdef CONFIG_LINUX_AIO
376 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
377 if (!strcmp(buf, "native")) {
378 bdrv_flags |= BDRV_O_NATIVE_AIO;
379 } else if (!strcmp(buf, "threads")) {
380 /* this is the default */
381 } else {
382 error_setg(errp, "invalid aio option");
383 goto early_err;
384 }
385 }
386 #endif
387
388 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
389 if (is_help_option(buf)) {
390 error_printf("Supported formats:");
391 bdrv_iterate_format(bdrv_format_print, NULL);
392 error_printf("\n");
393 goto early_err;
394 }
395
396 drv = bdrv_find_format(buf);
397 if (!drv) {
398 error_setg(errp, "'%s' invalid format", buf);
399 goto early_err;
400 }
401 }
402
403 /* disk I/O throttling */
404 memset(&cfg, 0, sizeof(cfg));
405 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
406 qemu_opt_get_number(opts, "throttling.bps-total", 0);
407 cfg.buckets[THROTTLE_BPS_READ].avg =
408 qemu_opt_get_number(opts, "throttling.bps-read", 0);
409 cfg.buckets[THROTTLE_BPS_WRITE].avg =
410 qemu_opt_get_number(opts, "throttling.bps-write", 0);
411 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
412 qemu_opt_get_number(opts, "throttling.iops-total", 0);
413 cfg.buckets[THROTTLE_OPS_READ].avg =
414 qemu_opt_get_number(opts, "throttling.iops-read", 0);
415 cfg.buckets[THROTTLE_OPS_WRITE].avg =
416 qemu_opt_get_number(opts, "throttling.iops-write", 0);
417
418 cfg.buckets[THROTTLE_BPS_TOTAL].max =
419 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
420 cfg.buckets[THROTTLE_BPS_READ].max =
421 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
422 cfg.buckets[THROTTLE_BPS_WRITE].max =
423 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
424 cfg.buckets[THROTTLE_OPS_TOTAL].max =
425 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
426 cfg.buckets[THROTTLE_OPS_READ].max =
427 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
428 cfg.buckets[THROTTLE_OPS_WRITE].max =
429 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
430
431 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
432
433 if (!check_throttle_config(&cfg, &error)) {
434 error_propagate(errp, error);
435 goto early_err;
436 }
437
438 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
439 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
440 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
441 error_setg(errp, "werror is not supported by this bus type");
442 goto early_err;
443 }
444
445 on_write_error = parse_block_error_action(buf, 0, &error);
446 if (error_is_set(&error)) {
447 error_propagate(errp, error);
448 goto early_err;
449 }
450 }
451
452 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
453 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
454 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
455 error_report("rerror is not supported by this bus type");
456 goto early_err;
457 }
458
459 on_read_error = parse_block_error_action(buf, 1, &error);
460 if (error_is_set(&error)) {
461 error_propagate(errp, error);
462 goto early_err;
463 }
464 }
465
466 /* init */
467 dinfo = g_malloc0(sizeof(*dinfo));
468 dinfo->id = g_strdup(qemu_opts_id(opts));
469 dinfo->bdrv = bdrv_new(dinfo->id);
470 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
471 dinfo->bdrv->read_only = ro;
472 dinfo->type = type;
473 dinfo->refcount = 1;
474 if (serial != NULL) {
475 dinfo->serial = g_strdup(serial);
476 }
477 QTAILQ_INSERT_TAIL(&drives, dinfo, next);
478
479 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
480
481 /* disk I/O throttling */
482 if (throttle_enabled(&cfg)) {
483 bdrv_io_limits_enable(dinfo->bdrv);
484 bdrv_set_io_limits(dinfo->bdrv, &cfg);
485 }
486
487 if (!file || !*file) {
488 if (has_driver_specific_opts) {
489 file = NULL;
490 } else {
491 QDECREF(bs_opts);
492 qemu_opts_del(opts);
493 return dinfo;
494 }
495 }
496 if (snapshot) {
497 /* always use cache=unsafe with snapshot */
498 bdrv_flags &= ~BDRV_O_CACHE_MASK;
499 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
500 }
501
502 if (copy_on_read) {
503 bdrv_flags |= BDRV_O_COPY_ON_READ;
504 }
505
506 if (runstate_check(RUN_STATE_INMIGRATE)) {
507 bdrv_flags |= BDRV_O_INCOMING;
508 }
509
510 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
511
512 QINCREF(bs_opts);
513 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
514
515 if (ret < 0) {
516 error_setg(errp, "could not open disk image %s: %s",
517 file ?: dinfo->id, error_get_pretty(error));
518 error_free(error);
519 goto err;
520 }
521
522 if (bdrv_key_required(dinfo->bdrv))
523 autostart = 0;
524
525 QDECREF(bs_opts);
526 qemu_opts_del(opts);
527
528 return dinfo;
529
530 err:
531 bdrv_unref(dinfo->bdrv);
532 g_free(dinfo->id);
533 QTAILQ_REMOVE(&drives, dinfo, next);
534 g_free(dinfo);
535 early_err:
536 QDECREF(bs_opts);
537 qemu_opts_del(opts);
538 return NULL;
539 }
540
541 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
542 {
543 const char *value;
544
545 value = qemu_opt_get(opts, from);
546 if (value) {
547 qemu_opt_set(opts, to, value);
548 qemu_opt_unset(opts, from);
549 }
550 }
551
552 QemuOptsList qemu_legacy_drive_opts = {
553 .name = "drive",
554 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
555 .desc = {
556 {
557 .name = "bus",
558 .type = QEMU_OPT_NUMBER,
559 .help = "bus number",
560 },{
561 .name = "unit",
562 .type = QEMU_OPT_NUMBER,
563 .help = "unit number (i.e. lun for scsi)",
564 },{
565 .name = "index",
566 .type = QEMU_OPT_NUMBER,
567 .help = "index number",
568 },{
569 .name = "media",
570 .type = QEMU_OPT_STRING,
571 .help = "media type (disk, cdrom)",
572 },{
573 .name = "if",
574 .type = QEMU_OPT_STRING,
575 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
576 },{
577 .name = "cyls",
578 .type = QEMU_OPT_NUMBER,
579 .help = "number of cylinders (ide disk geometry)",
580 },{
581 .name = "heads",
582 .type = QEMU_OPT_NUMBER,
583 .help = "number of heads (ide disk geometry)",
584 },{
585 .name = "secs",
586 .type = QEMU_OPT_NUMBER,
587 .help = "number of sectors (ide disk geometry)",
588 },{
589 .name = "trans",
590 .type = QEMU_OPT_STRING,
591 .help = "chs translation (auto, lba, none)",
592 },{
593 .name = "boot",
594 .type = QEMU_OPT_BOOL,
595 .help = "(deprecated, ignored)",
596 },{
597 .name = "addr",
598 .type = QEMU_OPT_STRING,
599 .help = "pci address (virtio only)",
600 },{
601 .name = "file",
602 .type = QEMU_OPT_STRING,
603 .help = "file name",
604 },
605
606 /* Options that are passed on, but have special semantics with -drive */
607 {
608 .name = "read-only",
609 .type = QEMU_OPT_BOOL,
610 .help = "open drive file as read-only",
611 },{
612 .name = "copy-on-read",
613 .type = QEMU_OPT_BOOL,
614 .help = "copy read data from backing file into image file",
615 },
616
617 { /* end of list */ }
618 },
619 };
620
621 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
622 {
623 const char *value;
624 DriveInfo *dinfo = NULL;
625 QDict *bs_opts;
626 QemuOpts *legacy_opts;
627 DriveMediaType media = MEDIA_DISK;
628 BlockInterfaceType type;
629 int cyls, heads, secs, translation;
630 int max_devs, bus_id, unit_id, index;
631 const char *devaddr;
632 bool read_only = false;
633 bool copy_on_read;
634 const char *filename;
635 Error *local_err = NULL;
636
637 /* Change legacy command line options into QMP ones */
638 qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
639 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
640 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
641
642 qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
643 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
644 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
645
646 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
647 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
648 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
649
650 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
651 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
652 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
653
654 qemu_opt_rename(all_opts,
655 "iops_size", "throttling.iops-size");
656
657 qemu_opt_rename(all_opts, "readonly", "read-only");
658
659 value = qemu_opt_get(all_opts, "cache");
660 if (value) {
661 int flags = 0;
662
663 if (bdrv_parse_cache_flags(value, &flags) != 0) {
664 error_report("invalid cache option");
665 return NULL;
666 }
667
668 /* Specific options take precedence */
669 if (!qemu_opt_get(all_opts, "cache.writeback")) {
670 qemu_opt_set_bool(all_opts, "cache.writeback",
671 !!(flags & BDRV_O_CACHE_WB));
672 }
673 if (!qemu_opt_get(all_opts, "cache.direct")) {
674 qemu_opt_set_bool(all_opts, "cache.direct",
675 !!(flags & BDRV_O_NOCACHE));
676 }
677 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
678 qemu_opt_set_bool(all_opts, "cache.no-flush",
679 !!(flags & BDRV_O_NO_FLUSH));
680 }
681 qemu_opt_unset(all_opts, "cache");
682 }
683
684 /* Get a QDict for processing the options */
685 bs_opts = qdict_new();
686 qemu_opts_to_qdict(all_opts, bs_opts);
687
688 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
689 &error_abort);
690 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
691 if (error_is_set(&local_err)) {
692 qerror_report_err(local_err);
693 error_free(local_err);
694 goto fail;
695 }
696
697 /* Deprecated option boot=[on|off] */
698 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
699 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
700 "ignored. Future versions will reject this parameter. Please "
701 "update your scripts.\n");
702 }
703
704 /* Media type */
705 value = qemu_opt_get(legacy_opts, "media");
706 if (value) {
707 if (!strcmp(value, "disk")) {
708 media = MEDIA_DISK;
709 } else if (!strcmp(value, "cdrom")) {
710 media = MEDIA_CDROM;
711 read_only = true;
712 } else {
713 error_report("'%s' invalid media", value);
714 goto fail;
715 }
716 }
717
718 /* copy-on-read is disabled with a warning for read-only devices */
719 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
720 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
721
722 if (read_only && copy_on_read) {
723 error_report("warning: disabling copy-on-read on read-only drive");
724 copy_on_read = false;
725 }
726
727 qdict_put(bs_opts, "read-only",
728 qstring_from_str(read_only ? "on" : "off"));
729 qdict_put(bs_opts, "copy-on-read",
730 qstring_from_str(copy_on_read ? "on" :"off"));
731
732 /* Controller type */
733 value = qemu_opt_get(legacy_opts, "if");
734 if (value) {
735 for (type = 0;
736 type < IF_COUNT && strcmp(value, if_name[type]);
737 type++) {
738 }
739 if (type == IF_COUNT) {
740 error_report("unsupported bus type '%s'", value);
741 goto fail;
742 }
743 } else {
744 type = block_default_type;
745 }
746
747 /* Geometry */
748 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
749 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
750 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
751
752 if (cyls || heads || secs) {
753 if (cyls < 1) {
754 error_report("invalid physical cyls number");
755 goto fail;
756 }
757 if (heads < 1) {
758 error_report("invalid physical heads number");
759 goto fail;
760 }
761 if (secs < 1) {
762 error_report("invalid physical secs number");
763 goto fail;
764 }
765 }
766
767 translation = BIOS_ATA_TRANSLATION_AUTO;
768 value = qemu_opt_get(legacy_opts, "trans");
769 if (value != NULL) {
770 if (!cyls) {
771 error_report("'%s' trans must be used with cyls, heads and secs",
772 value);
773 goto fail;
774 }
775 if (!strcmp(value, "none")) {
776 translation = BIOS_ATA_TRANSLATION_NONE;
777 } else if (!strcmp(value, "lba")) {
778 translation = BIOS_ATA_TRANSLATION_LBA;
779 } else if (!strcmp(value, "auto")) {
780 translation = BIOS_ATA_TRANSLATION_AUTO;
781 } else {
782 error_report("'%s' invalid translation type", value);
783 goto fail;
784 }
785 }
786
787 if (media == MEDIA_CDROM) {
788 if (cyls || secs || heads) {
789 error_report("CHS can't be set with media=cdrom");
790 goto fail;
791 }
792 }
793
794 /* Device address specified by bus/unit or index.
795 * If none was specified, try to find the first free one. */
796 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
797 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
798 index = qemu_opt_get_number(legacy_opts, "index", -1);
799
800 max_devs = if_max_devs[type];
801
802 if (index != -1) {
803 if (bus_id != 0 || unit_id != -1) {
804 error_report("index cannot be used with bus and unit");
805 goto fail;
806 }
807 bus_id = drive_index_to_bus_id(type, index);
808 unit_id = drive_index_to_unit_id(type, index);
809 }
810
811 if (unit_id == -1) {
812 unit_id = 0;
813 while (drive_get(type, bus_id, unit_id) != NULL) {
814 unit_id++;
815 if (max_devs && unit_id >= max_devs) {
816 unit_id -= max_devs;
817 bus_id++;
818 }
819 }
820 }
821
822 if (max_devs && unit_id >= max_devs) {
823 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
824 goto fail;
825 }
826
827 if (drive_get(type, bus_id, unit_id) != NULL) {
828 error_report("drive with bus=%d, unit=%d (index=%d) exists",
829 bus_id, unit_id, index);
830 goto fail;
831 }
832
833 /* no id supplied -> create one */
834 if (qemu_opts_id(all_opts) == NULL) {
835 char *new_id;
836 const char *mediastr = "";
837 if (type == IF_IDE || type == IF_SCSI) {
838 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
839 }
840 if (max_devs) {
841 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
842 mediastr, unit_id);
843 } else {
844 new_id = g_strdup_printf("%s%s%i", if_name[type],
845 mediastr, unit_id);
846 }
847 qdict_put(bs_opts, "id", qstring_from_str(new_id));
848 g_free(new_id);
849 }
850
851 /* Add virtio block device */
852 devaddr = qemu_opt_get(legacy_opts, "addr");
853 if (devaddr && type != IF_VIRTIO) {
854 error_report("addr is not supported by this bus type");
855 goto fail;
856 }
857
858 if (type == IF_VIRTIO) {
859 QemuOpts *devopts;
860 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
861 &error_abort);
862 if (arch_type == QEMU_ARCH_S390X) {
863 qemu_opt_set(devopts, "driver", "virtio-blk-s390");
864 } else {
865 qemu_opt_set(devopts, "driver", "virtio-blk-pci");
866 }
867 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"));
868 if (devaddr) {
869 qemu_opt_set(devopts, "addr", devaddr);
870 }
871 }
872
873 filename = qemu_opt_get(legacy_opts, "file");
874
875 /* Actual block device init: Functionality shared with blockdev-add */
876 dinfo = blockdev_init(filename, bs_opts, type, &local_err);
877 if (dinfo == NULL) {
878 if (error_is_set(&local_err)) {
879 qerror_report_err(local_err);
880 error_free(local_err);
881 }
882 goto fail;
883 } else {
884 assert(!error_is_set(&local_err));
885 }
886
887 /* Set legacy DriveInfo fields */
888 dinfo->enable_auto_del = true;
889 dinfo->opts = all_opts;
890
891 dinfo->cyls = cyls;
892 dinfo->heads = heads;
893 dinfo->secs = secs;
894 dinfo->trans = translation;
895
896 dinfo->bus = bus_id;
897 dinfo->unit = unit_id;
898 dinfo->devaddr = devaddr;
899
900 switch(type) {
901 case IF_IDE:
902 case IF_SCSI:
903 case IF_XEN:
904 case IF_NONE:
905 dinfo->media_cd = media == MEDIA_CDROM;
906 break;
907 default:
908 break;
909 }
910
911 fail:
912 qemu_opts_del(legacy_opts);
913 return dinfo;
914 }
915
916 void do_commit(Monitor *mon, const QDict *qdict)
917 {
918 const char *device = qdict_get_str(qdict, "device");
919 BlockDriverState *bs;
920 int ret;
921
922 if (!strcmp(device, "all")) {
923 ret = bdrv_commit_all();
924 } else {
925 bs = bdrv_find(device);
926 if (!bs) {
927 monitor_printf(mon, "Device '%s' not found\n", device);
928 return;
929 }
930 ret = bdrv_commit(bs);
931 }
932 if (ret < 0) {
933 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
934 strerror(-ret));
935 }
936 }
937
938 static void blockdev_do_action(int kind, void *data, Error **errp)
939 {
940 TransactionAction action;
941 TransactionActionList list;
942
943 action.kind = kind;
944 action.data = data;
945 list.value = &action;
946 list.next = NULL;
947 qmp_transaction(&list, errp);
948 }
949
950 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
951 bool has_format, const char *format,
952 bool has_mode, enum NewImageMode mode,
953 Error **errp)
954 {
955 BlockdevSnapshot snapshot = {
956 .device = (char *) device,
957 .snapshot_file = (char *) snapshot_file,
958 .has_format = has_format,
959 .format = (char *) format,
960 .has_mode = has_mode,
961 .mode = mode,
962 };
963 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
964 &snapshot, errp);
965 }
966
967 void qmp_blockdev_snapshot_internal_sync(const char *device,
968 const char *name,
969 Error **errp)
970 {
971 BlockdevSnapshotInternal snapshot = {
972 .device = (char *) device,
973 .name = (char *) name
974 };
975
976 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
977 &snapshot, errp);
978 }
979
980 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
981 bool has_id,
982 const char *id,
983 bool has_name,
984 const char *name,
985 Error **errp)
986 {
987 BlockDriverState *bs = bdrv_find(device);
988 QEMUSnapshotInfo sn;
989 Error *local_err = NULL;
990 SnapshotInfo *info = NULL;
991 int ret;
992
993 if (!bs) {
994 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
995 return NULL;
996 }
997
998 if (!has_id) {
999 id = NULL;
1000 }
1001
1002 if (!has_name) {
1003 name = NULL;
1004 }
1005
1006 if (!id && !name) {
1007 error_setg(errp, "Name or id must be provided");
1008 return NULL;
1009 }
1010
1011 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1012 if (error_is_set(&local_err)) {
1013 error_propagate(errp, local_err);
1014 return NULL;
1015 }
1016 if (!ret) {
1017 error_setg(errp,
1018 "Snapshot with id '%s' and name '%s' does not exist on "
1019 "device '%s'",
1020 STR_OR_NULL(id), STR_OR_NULL(name), device);
1021 return NULL;
1022 }
1023
1024 bdrv_snapshot_delete(bs, id, name, &local_err);
1025 if (error_is_set(&local_err)) {
1026 error_propagate(errp, local_err);
1027 return NULL;
1028 }
1029
1030 info = g_malloc0(sizeof(SnapshotInfo));
1031 info->id = g_strdup(sn.id_str);
1032 info->name = g_strdup(sn.name);
1033 info->date_nsec = sn.date_nsec;
1034 info->date_sec = sn.date_sec;
1035 info->vm_state_size = sn.vm_state_size;
1036 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1037 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1038
1039 return info;
1040 }
1041
1042 /* New and old BlockDriverState structs for group snapshots */
1043
1044 typedef struct BlkTransactionState BlkTransactionState;
1045
1046 /* Only prepare() may fail. In a single transaction, only one of commit() or
1047 abort() will be called, clean() will always be called if it present. */
1048 typedef struct BdrvActionOps {
1049 /* Size of state struct, in bytes. */
1050 size_t instance_size;
1051 /* Prepare the work, must NOT be NULL. */
1052 void (*prepare)(BlkTransactionState *common, Error **errp);
1053 /* Commit the changes, can be NULL. */
1054 void (*commit)(BlkTransactionState *common);
1055 /* Abort the changes on fail, can be NULL. */
1056 void (*abort)(BlkTransactionState *common);
1057 /* Clean up resource in the end, can be NULL. */
1058 void (*clean)(BlkTransactionState *common);
1059 } BdrvActionOps;
1060
1061 /*
1062 * This structure must be arranged as first member in child type, assuming
1063 * that compiler will also arrange it to the same address with parent instance.
1064 * Later it will be used in free().
1065 */
1066 struct BlkTransactionState {
1067 TransactionAction *action;
1068 const BdrvActionOps *ops;
1069 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1070 };
1071
1072 /* internal snapshot private data */
1073 typedef struct InternalSnapshotState {
1074 BlkTransactionState common;
1075 BlockDriverState *bs;
1076 QEMUSnapshotInfo sn;
1077 } InternalSnapshotState;
1078
1079 static void internal_snapshot_prepare(BlkTransactionState *common,
1080 Error **errp)
1081 {
1082 const char *device;
1083 const char *name;
1084 BlockDriverState *bs;
1085 QEMUSnapshotInfo old_sn, *sn;
1086 bool ret;
1087 qemu_timeval tv;
1088 BlockdevSnapshotInternal *internal;
1089 InternalSnapshotState *state;
1090 int ret1;
1091
1092 g_assert(common->action->kind ==
1093 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1094 internal = common->action->blockdev_snapshot_internal_sync;
1095 state = DO_UPCAST(InternalSnapshotState, common, common);
1096
1097 /* 1. parse input */
1098 device = internal->device;
1099 name = internal->name;
1100
1101 /* 2. check for validation */
1102 bs = bdrv_find(device);
1103 if (!bs) {
1104 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1105 return;
1106 }
1107
1108 if (!bdrv_is_inserted(bs)) {
1109 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1110 return;
1111 }
1112
1113 if (bdrv_is_read_only(bs)) {
1114 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1115 return;
1116 }
1117
1118 if (!bdrv_can_snapshot(bs)) {
1119 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1120 bs->drv->format_name, device, "internal snapshot");
1121 return;
1122 }
1123
1124 if (!strlen(name)) {
1125 error_setg(errp, "Name is empty");
1126 return;
1127 }
1128
1129 /* check whether a snapshot with name exist */
1130 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
1131 if (error_is_set(errp)) {
1132 return;
1133 } else if (ret) {
1134 error_setg(errp,
1135 "Snapshot with name '%s' already exists on device '%s'",
1136 name, device);
1137 return;
1138 }
1139
1140 /* 3. take the snapshot */
1141 sn = &state->sn;
1142 pstrcpy(sn->name, sizeof(sn->name), name);
1143 qemu_gettimeofday(&tv);
1144 sn->date_sec = tv.tv_sec;
1145 sn->date_nsec = tv.tv_usec * 1000;
1146 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1147
1148 ret1 = bdrv_snapshot_create(bs, sn);
1149 if (ret1 < 0) {
1150 error_setg_errno(errp, -ret1,
1151 "Failed to create snapshot '%s' on device '%s'",
1152 name, device);
1153 return;
1154 }
1155
1156 /* 4. succeed, mark a snapshot is created */
1157 state->bs = bs;
1158 }
1159
1160 static void internal_snapshot_abort(BlkTransactionState *common)
1161 {
1162 InternalSnapshotState *state =
1163 DO_UPCAST(InternalSnapshotState, common, common);
1164 BlockDriverState *bs = state->bs;
1165 QEMUSnapshotInfo *sn = &state->sn;
1166 Error *local_error = NULL;
1167
1168 if (!bs) {
1169 return;
1170 }
1171
1172 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1173 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1174 "device '%s' in abort: %s",
1175 sn->id_str,
1176 sn->name,
1177 bdrv_get_device_name(bs),
1178 error_get_pretty(local_error));
1179 error_free(local_error);
1180 }
1181 }
1182
1183 /* external snapshot private data */
1184 typedef struct ExternalSnapshotState {
1185 BlkTransactionState common;
1186 BlockDriverState *old_bs;
1187 BlockDriverState *new_bs;
1188 } ExternalSnapshotState;
1189
1190 static void external_snapshot_prepare(BlkTransactionState *common,
1191 Error **errp)
1192 {
1193 BlockDriver *drv;
1194 int flags, ret;
1195 Error *local_err = NULL;
1196 const char *device;
1197 const char *new_image_file;
1198 const char *format = "qcow2";
1199 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1200 ExternalSnapshotState *state =
1201 DO_UPCAST(ExternalSnapshotState, common, common);
1202 TransactionAction *action = common->action;
1203
1204 /* get parameters */
1205 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1206
1207 device = action->blockdev_snapshot_sync->device;
1208 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1209 if (action->blockdev_snapshot_sync->has_format) {
1210 format = action->blockdev_snapshot_sync->format;
1211 }
1212 if (action->blockdev_snapshot_sync->has_mode) {
1213 mode = action->blockdev_snapshot_sync->mode;
1214 }
1215
1216 /* start processing */
1217 drv = bdrv_find_format(format);
1218 if (!drv) {
1219 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1220 return;
1221 }
1222
1223 state->old_bs = bdrv_find(device);
1224 if (!state->old_bs) {
1225 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1226 return;
1227 }
1228
1229 if (!bdrv_is_inserted(state->old_bs)) {
1230 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1231 return;
1232 }
1233
1234 if (bdrv_in_use(state->old_bs)) {
1235 error_set(errp, QERR_DEVICE_IN_USE, device);
1236 return;
1237 }
1238
1239 if (!bdrv_is_read_only(state->old_bs)) {
1240 if (bdrv_flush(state->old_bs)) {
1241 error_set(errp, QERR_IO_ERROR);
1242 return;
1243 }
1244 }
1245
1246 if (bdrv_check_ext_snapshot(state->old_bs) != EXT_SNAPSHOT_ALLOWED) {
1247 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1248 return;
1249 }
1250
1251 flags = state->old_bs->open_flags;
1252
1253 /* create new image w/backing file */
1254 if (mode != NEW_IMAGE_MODE_EXISTING) {
1255 bdrv_img_create(new_image_file, format,
1256 state->old_bs->filename,
1257 state->old_bs->drv->format_name,
1258 NULL, -1, flags, &local_err, false);
1259 if (error_is_set(&local_err)) {
1260 error_propagate(errp, local_err);
1261 return;
1262 }
1263 }
1264
1265 /* We will manually add the backing_hd field to the bs later */
1266 state->new_bs = bdrv_new("");
1267 /* TODO Inherit bs->options or only take explicit options with an
1268 * extended QMP command? */
1269 ret = bdrv_open(state->new_bs, new_image_file, NULL,
1270 flags | BDRV_O_NO_BACKING, drv, &local_err);
1271 if (ret != 0) {
1272 error_propagate(errp, local_err);
1273 }
1274 }
1275
1276 static void external_snapshot_commit(BlkTransactionState *common)
1277 {
1278 ExternalSnapshotState *state =
1279 DO_UPCAST(ExternalSnapshotState, common, common);
1280
1281 /* This removes our old bs and adds the new bs */
1282 bdrv_append(state->new_bs, state->old_bs);
1283 /* We don't need (or want) to use the transactional
1284 * bdrv_reopen_multiple() across all the entries at once, because we
1285 * don't want to abort all of them if one of them fails the reopen */
1286 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1287 NULL);
1288 }
1289
1290 static void external_snapshot_abort(BlkTransactionState *common)
1291 {
1292 ExternalSnapshotState *state =
1293 DO_UPCAST(ExternalSnapshotState, common, common);
1294 if (state->new_bs) {
1295 bdrv_unref(state->new_bs);
1296 }
1297 }
1298
1299 typedef struct DriveBackupState {
1300 BlkTransactionState common;
1301 BlockDriverState *bs;
1302 BlockJob *job;
1303 } DriveBackupState;
1304
1305 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1306 {
1307 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1308 DriveBackup *backup;
1309 Error *local_err = NULL;
1310
1311 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1312 backup = common->action->drive_backup;
1313
1314 qmp_drive_backup(backup->device, backup->target,
1315 backup->has_format, backup->format,
1316 backup->sync,
1317 backup->has_mode, backup->mode,
1318 backup->has_speed, backup->speed,
1319 backup->has_on_source_error, backup->on_source_error,
1320 backup->has_on_target_error, backup->on_target_error,
1321 &local_err);
1322 if (error_is_set(&local_err)) {
1323 error_propagate(errp, local_err);
1324 state->bs = NULL;
1325 state->job = NULL;
1326 return;
1327 }
1328
1329 state->bs = bdrv_find(backup->device);
1330 state->job = state->bs->job;
1331 }
1332
1333 static void drive_backup_abort(BlkTransactionState *common)
1334 {
1335 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1336 BlockDriverState *bs = state->bs;
1337
1338 /* Only cancel if it's the job we started */
1339 if (bs && bs->job && bs->job == state->job) {
1340 block_job_cancel_sync(bs->job);
1341 }
1342 }
1343
1344 static void abort_prepare(BlkTransactionState *common, Error **errp)
1345 {
1346 error_setg(errp, "Transaction aborted using Abort action");
1347 }
1348
1349 static void abort_commit(BlkTransactionState *common)
1350 {
1351 g_assert_not_reached(); /* this action never succeeds */
1352 }
1353
1354 static const BdrvActionOps actions[] = {
1355 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1356 .instance_size = sizeof(ExternalSnapshotState),
1357 .prepare = external_snapshot_prepare,
1358 .commit = external_snapshot_commit,
1359 .abort = external_snapshot_abort,
1360 },
1361 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1362 .instance_size = sizeof(DriveBackupState),
1363 .prepare = drive_backup_prepare,
1364 .abort = drive_backup_abort,
1365 },
1366 [TRANSACTION_ACTION_KIND_ABORT] = {
1367 .instance_size = sizeof(BlkTransactionState),
1368 .prepare = abort_prepare,
1369 .commit = abort_commit,
1370 },
1371 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1372 .instance_size = sizeof(InternalSnapshotState),
1373 .prepare = internal_snapshot_prepare,
1374 .abort = internal_snapshot_abort,
1375 },
1376 };
1377
1378 /*
1379 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1380 * then we do not pivot any of the devices in the group, and abandon the
1381 * snapshots
1382 */
1383 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1384 {
1385 TransactionActionList *dev_entry = dev_list;
1386 BlkTransactionState *state, *next;
1387 Error *local_err = NULL;
1388
1389 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1390 QSIMPLEQ_INIT(&snap_bdrv_states);
1391
1392 /* drain all i/o before any snapshots */
1393 bdrv_drain_all();
1394
1395 /* We don't do anything in this loop that commits us to the snapshot */
1396 while (NULL != dev_entry) {
1397 TransactionAction *dev_info = NULL;
1398 const BdrvActionOps *ops;
1399
1400 dev_info = dev_entry->value;
1401 dev_entry = dev_entry->next;
1402
1403 assert(dev_info->kind < ARRAY_SIZE(actions));
1404
1405 ops = &actions[dev_info->kind];
1406 assert(ops->instance_size > 0);
1407
1408 state = g_malloc0(ops->instance_size);
1409 state->ops = ops;
1410 state->action = dev_info;
1411 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1412
1413 state->ops->prepare(state, &local_err);
1414 if (error_is_set(&local_err)) {
1415 error_propagate(errp, local_err);
1416 goto delete_and_fail;
1417 }
1418 }
1419
1420 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1421 if (state->ops->commit) {
1422 state->ops->commit(state);
1423 }
1424 }
1425
1426 /* success */
1427 goto exit;
1428
1429 delete_and_fail:
1430 /*
1431 * failure, and it is all-or-none; abandon each new bs, and keep using
1432 * the original bs for all images
1433 */
1434 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1435 if (state->ops->abort) {
1436 state->ops->abort(state);
1437 }
1438 }
1439 exit:
1440 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1441 if (state->ops->clean) {
1442 state->ops->clean(state);
1443 }
1444 g_free(state);
1445 }
1446 }
1447
1448
1449 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1450 {
1451 if (bdrv_in_use(bs)) {
1452 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1453 return;
1454 }
1455 if (!bdrv_dev_has_removable_media(bs)) {
1456 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1457 return;
1458 }
1459
1460 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1461 bdrv_dev_eject_request(bs, force);
1462 if (!force) {
1463 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1464 return;
1465 }
1466 }
1467
1468 bdrv_close(bs);
1469 }
1470
1471 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1472 {
1473 BlockDriverState *bs;
1474
1475 bs = bdrv_find(device);
1476 if (!bs) {
1477 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1478 return;
1479 }
1480
1481 eject_device(bs, force, errp);
1482 }
1483
1484 void qmp_block_passwd(const char *device, const char *password, Error **errp)
1485 {
1486 BlockDriverState *bs;
1487 int err;
1488
1489 bs = bdrv_find(device);
1490 if (!bs) {
1491 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1492 return;
1493 }
1494
1495 err = bdrv_set_key(bs, password);
1496 if (err == -EINVAL) {
1497 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1498 return;
1499 } else if (err < 0) {
1500 error_set(errp, QERR_INVALID_PASSWORD);
1501 return;
1502 }
1503 }
1504
1505 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1506 int bdrv_flags, BlockDriver *drv,
1507 const char *password, Error **errp)
1508 {
1509 Error *local_err = NULL;
1510 int ret;
1511
1512 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
1513 if (ret < 0) {
1514 error_propagate(errp, local_err);
1515 return;
1516 }
1517
1518 if (bdrv_key_required(bs)) {
1519 if (password) {
1520 if (bdrv_set_key(bs, password) < 0) {
1521 error_set(errp, QERR_INVALID_PASSWORD);
1522 }
1523 } else {
1524 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1525 bdrv_get_encrypted_filename(bs));
1526 }
1527 } else if (password) {
1528 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1529 }
1530 }
1531
1532 void qmp_change_blockdev(const char *device, const char *filename,
1533 const char *format, Error **errp)
1534 {
1535 BlockDriverState *bs;
1536 BlockDriver *drv = NULL;
1537 int bdrv_flags;
1538 Error *err = NULL;
1539
1540 bs = bdrv_find(device);
1541 if (!bs) {
1542 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1543 return;
1544 }
1545
1546 if (format) {
1547 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1548 if (!drv) {
1549 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1550 return;
1551 }
1552 }
1553
1554 eject_device(bs, 0, &err);
1555 if (error_is_set(&err)) {
1556 error_propagate(errp, err);
1557 return;
1558 }
1559
1560 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1561 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1562
1563 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1564 }
1565
1566 /* throttling disk I/O limits */
1567 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1568 int64_t bps_wr,
1569 int64_t iops,
1570 int64_t iops_rd,
1571 int64_t iops_wr,
1572 bool has_bps_max,
1573 int64_t bps_max,
1574 bool has_bps_rd_max,
1575 int64_t bps_rd_max,
1576 bool has_bps_wr_max,
1577 int64_t bps_wr_max,
1578 bool has_iops_max,
1579 int64_t iops_max,
1580 bool has_iops_rd_max,
1581 int64_t iops_rd_max,
1582 bool has_iops_wr_max,
1583 int64_t iops_wr_max,
1584 bool has_iops_size,
1585 int64_t iops_size, Error **errp)
1586 {
1587 ThrottleConfig cfg;
1588 BlockDriverState *bs;
1589
1590 bs = bdrv_find(device);
1591 if (!bs) {
1592 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1593 return;
1594 }
1595
1596 memset(&cfg, 0, sizeof(cfg));
1597 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1598 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1599 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1600
1601 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1602 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1603 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1604
1605 if (has_bps_max) {
1606 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1607 }
1608 if (has_bps_rd_max) {
1609 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1610 }
1611 if (has_bps_wr_max) {
1612 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1613 }
1614 if (has_iops_max) {
1615 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1616 }
1617 if (has_iops_rd_max) {
1618 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1619 }
1620 if (has_iops_wr_max) {
1621 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1622 }
1623
1624 if (has_iops_size) {
1625 cfg.op_size = iops_size;
1626 }
1627
1628 if (!check_throttle_config(&cfg, errp)) {
1629 return;
1630 }
1631
1632 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1633 bdrv_io_limits_enable(bs);
1634 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1635 bdrv_io_limits_disable(bs);
1636 }
1637
1638 if (bs->io_limits_enabled) {
1639 bdrv_set_io_limits(bs, &cfg);
1640 }
1641 }
1642
1643 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1644 {
1645 const char *id = qdict_get_str(qdict, "id");
1646 BlockDriverState *bs;
1647
1648 bs = bdrv_find(id);
1649 if (!bs) {
1650 qerror_report(QERR_DEVICE_NOT_FOUND, id);
1651 return -1;
1652 }
1653 if (bdrv_in_use(bs)) {
1654 qerror_report(QERR_DEVICE_IN_USE, id);
1655 return -1;
1656 }
1657
1658 /* quiesce block driver; prevent further io */
1659 bdrv_drain_all();
1660 bdrv_flush(bs);
1661 bdrv_close(bs);
1662
1663 /* if we have a device attached to this BlockDriverState
1664 * then we need to make the drive anonymous until the device
1665 * can be removed. If this is a drive with no device backing
1666 * then we can just get rid of the block driver state right here.
1667 */
1668 if (bdrv_get_attached_dev(bs)) {
1669 bdrv_make_anon(bs);
1670
1671 /* Further I/O must not pause the guest */
1672 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1673 BLOCKDEV_ON_ERROR_REPORT);
1674 } else {
1675 drive_uninit(drive_get_by_blockdev(bs));
1676 }
1677
1678 return 0;
1679 }
1680
1681 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1682 {
1683 BlockDriverState *bs;
1684 int ret;
1685
1686 bs = bdrv_find(device);
1687 if (!bs) {
1688 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1689 return;
1690 }
1691
1692 if (size < 0) {
1693 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1694 return;
1695 }
1696
1697 /* complete all in-flight operations before resizing the device */
1698 bdrv_drain_all();
1699
1700 ret = bdrv_truncate(bs, size);
1701 switch (ret) {
1702 case 0:
1703 break;
1704 case -ENOMEDIUM:
1705 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1706 break;
1707 case -ENOTSUP:
1708 error_set(errp, QERR_UNSUPPORTED);
1709 break;
1710 case -EACCES:
1711 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1712 break;
1713 case -EBUSY:
1714 error_set(errp, QERR_DEVICE_IN_USE, device);
1715 break;
1716 default:
1717 error_setg_errno(errp, -ret, "Could not resize");
1718 break;
1719 }
1720 }
1721
1722 static void block_job_cb(void *opaque, int ret)
1723 {
1724 BlockDriverState *bs = opaque;
1725 QObject *obj;
1726
1727 trace_block_job_cb(bs, bs->job, ret);
1728
1729 assert(bs->job);
1730 obj = qobject_from_block_job(bs->job);
1731 if (ret < 0) {
1732 QDict *dict = qobject_to_qdict(obj);
1733 qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1734 }
1735
1736 if (block_job_is_cancelled(bs->job)) {
1737 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1738 } else {
1739 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1740 }
1741 qobject_decref(obj);
1742
1743 bdrv_put_ref_bh_schedule(bs);
1744 }
1745
1746 void qmp_block_stream(const char *device, bool has_base,
1747 const char *base, bool has_speed, int64_t speed,
1748 bool has_on_error, BlockdevOnError on_error,
1749 Error **errp)
1750 {
1751 BlockDriverState *bs;
1752 BlockDriverState *base_bs = NULL;
1753 Error *local_err = NULL;
1754
1755 if (!has_on_error) {
1756 on_error = BLOCKDEV_ON_ERROR_REPORT;
1757 }
1758
1759 bs = bdrv_find(device);
1760 if (!bs) {
1761 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1762 return;
1763 }
1764
1765 if (base) {
1766 base_bs = bdrv_find_backing_image(bs, base);
1767 if (base_bs == NULL) {
1768 error_set(errp, QERR_BASE_NOT_FOUND, base);
1769 return;
1770 }
1771 }
1772
1773 stream_start(bs, base_bs, base, has_speed ? speed : 0,
1774 on_error, block_job_cb, bs, &local_err);
1775 if (error_is_set(&local_err)) {
1776 error_propagate(errp, local_err);
1777 return;
1778 }
1779
1780 trace_qmp_block_stream(bs, bs->job);
1781 }
1782
1783 void qmp_block_commit(const char *device,
1784 bool has_base, const char *base, const char *top,
1785 bool has_speed, int64_t speed,
1786 Error **errp)
1787 {
1788 BlockDriverState *bs;
1789 BlockDriverState *base_bs, *top_bs;
1790 Error *local_err = NULL;
1791 /* This will be part of the QMP command, if/when the
1792 * BlockdevOnError change for blkmirror makes it in
1793 */
1794 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1795
1796 /* drain all i/o before commits */
1797 bdrv_drain_all();
1798
1799 bs = bdrv_find(device);
1800 if (!bs) {
1801 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1802 return;
1803 }
1804
1805 /* default top_bs is the active layer */
1806 top_bs = bs;
1807
1808 if (top) {
1809 if (strcmp(bs->filename, top) != 0) {
1810 top_bs = bdrv_find_backing_image(bs, top);
1811 }
1812 }
1813
1814 if (top_bs == NULL) {
1815 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1816 return;
1817 }
1818
1819 if (has_base && base) {
1820 base_bs = bdrv_find_backing_image(top_bs, base);
1821 } else {
1822 base_bs = bdrv_find_base(top_bs);
1823 }
1824
1825 if (base_bs == NULL) {
1826 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1827 return;
1828 }
1829
1830 if (top_bs == bs) {
1831 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
1832 bs, &local_err);
1833 } else {
1834 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1835 &local_err);
1836 }
1837 if (local_err != NULL) {
1838 error_propagate(errp, local_err);
1839 return;
1840 }
1841 }
1842
1843 void qmp_drive_backup(const char *device, const char *target,
1844 bool has_format, const char *format,
1845 enum MirrorSyncMode sync,
1846 bool has_mode, enum NewImageMode mode,
1847 bool has_speed, int64_t speed,
1848 bool has_on_source_error, BlockdevOnError on_source_error,
1849 bool has_on_target_error, BlockdevOnError on_target_error,
1850 Error **errp)
1851 {
1852 BlockDriverState *bs;
1853 BlockDriverState *target_bs;
1854 BlockDriverState *source = NULL;
1855 BlockDriver *drv = NULL;
1856 Error *local_err = NULL;
1857 int flags;
1858 int64_t size;
1859 int ret;
1860
1861 if (!has_speed) {
1862 speed = 0;
1863 }
1864 if (!has_on_source_error) {
1865 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1866 }
1867 if (!has_on_target_error) {
1868 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1869 }
1870 if (!has_mode) {
1871 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1872 }
1873
1874 bs = bdrv_find(device);
1875 if (!bs) {
1876 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1877 return;
1878 }
1879
1880 if (!bdrv_is_inserted(bs)) {
1881 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1882 return;
1883 }
1884
1885 if (!has_format) {
1886 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1887 }
1888 if (format) {
1889 drv = bdrv_find_format(format);
1890 if (!drv) {
1891 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1892 return;
1893 }
1894 }
1895
1896 if (bdrv_in_use(bs)) {
1897 error_set(errp, QERR_DEVICE_IN_USE, device);
1898 return;
1899 }
1900
1901 flags = bs->open_flags | BDRV_O_RDWR;
1902
1903 /* See if we have a backing HD we can use to create our new image
1904 * on top of. */
1905 if (sync == MIRROR_SYNC_MODE_TOP) {
1906 source = bs->backing_hd;
1907 if (!source) {
1908 sync = MIRROR_SYNC_MODE_FULL;
1909 }
1910 }
1911 if (sync == MIRROR_SYNC_MODE_NONE) {
1912 source = bs;
1913 }
1914
1915 size = bdrv_getlength(bs);
1916 if (size < 0) {
1917 error_setg_errno(errp, -size, "bdrv_getlength failed");
1918 return;
1919 }
1920
1921 if (mode != NEW_IMAGE_MODE_EXISTING) {
1922 assert(format && drv);
1923 if (source) {
1924 bdrv_img_create(target, format, source->filename,
1925 source->drv->format_name, NULL,
1926 size, flags, &local_err, false);
1927 } else {
1928 bdrv_img_create(target, format, NULL, NULL, NULL,
1929 size, flags, &local_err, false);
1930 }
1931 }
1932
1933 if (error_is_set(&local_err)) {
1934 error_propagate(errp, local_err);
1935 return;
1936 }
1937
1938 target_bs = bdrv_new("");
1939 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
1940 if (ret < 0) {
1941 bdrv_unref(target_bs);
1942 error_propagate(errp, local_err);
1943 return;
1944 }
1945
1946 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1947 block_job_cb, bs, &local_err);
1948 if (local_err != NULL) {
1949 bdrv_unref(target_bs);
1950 error_propagate(errp, local_err);
1951 return;
1952 }
1953 }
1954
1955 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
1956
1957 void qmp_drive_mirror(const char *device, const char *target,
1958 bool has_format, const char *format,
1959 enum MirrorSyncMode sync,
1960 bool has_mode, enum NewImageMode mode,
1961 bool has_speed, int64_t speed,
1962 bool has_granularity, uint32_t granularity,
1963 bool has_buf_size, int64_t buf_size,
1964 bool has_on_source_error, BlockdevOnError on_source_error,
1965 bool has_on_target_error, BlockdevOnError on_target_error,
1966 Error **errp)
1967 {
1968 BlockDriverState *bs;
1969 BlockDriverState *source, *target_bs;
1970 BlockDriver *drv = NULL;
1971 Error *local_err = NULL;
1972 int flags;
1973 int64_t size;
1974 int ret;
1975
1976 if (!has_speed) {
1977 speed = 0;
1978 }
1979 if (!has_on_source_error) {
1980 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1981 }
1982 if (!has_on_target_error) {
1983 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1984 }
1985 if (!has_mode) {
1986 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1987 }
1988 if (!has_granularity) {
1989 granularity = 0;
1990 }
1991 if (!has_buf_size) {
1992 buf_size = DEFAULT_MIRROR_BUF_SIZE;
1993 }
1994
1995 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1996 error_set(errp, QERR_INVALID_PARAMETER, device);
1997 return;
1998 }
1999 if (granularity & (granularity - 1)) {
2000 error_set(errp, QERR_INVALID_PARAMETER, device);
2001 return;
2002 }
2003
2004 bs = bdrv_find(device);
2005 if (!bs) {
2006 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2007 return;
2008 }
2009
2010 if (!bdrv_is_inserted(bs)) {
2011 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2012 return;
2013 }
2014
2015 if (!has_format) {
2016 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2017 }
2018 if (format) {
2019 drv = bdrv_find_format(format);
2020 if (!drv) {
2021 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2022 return;
2023 }
2024 }
2025
2026 if (bdrv_in_use(bs)) {
2027 error_set(errp, QERR_DEVICE_IN_USE, device);
2028 return;
2029 }
2030
2031 flags = bs->open_flags | BDRV_O_RDWR;
2032 source = bs->backing_hd;
2033 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2034 sync = MIRROR_SYNC_MODE_FULL;
2035 }
2036 if (sync == MIRROR_SYNC_MODE_NONE) {
2037 source = bs;
2038 }
2039
2040 size = bdrv_getlength(bs);
2041 if (size < 0) {
2042 error_setg_errno(errp, -size, "bdrv_getlength failed");
2043 return;
2044 }
2045
2046 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2047 && mode != NEW_IMAGE_MODE_EXISTING)
2048 {
2049 /* create new image w/o backing file */
2050 assert(format && drv);
2051 bdrv_img_create(target, format,
2052 NULL, NULL, NULL, size, flags, &local_err, false);
2053 } else {
2054 switch (mode) {
2055 case NEW_IMAGE_MODE_EXISTING:
2056 break;
2057 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2058 /* create new image with backing file */
2059 bdrv_img_create(target, format,
2060 source->filename,
2061 source->drv->format_name,
2062 NULL, size, flags, &local_err, false);
2063 break;
2064 default:
2065 abort();
2066 }
2067 }
2068
2069 if (error_is_set(&local_err)) {
2070 error_propagate(errp, local_err);
2071 return;
2072 }
2073
2074 /* Mirroring takes care of copy-on-write using the source's backing
2075 * file.
2076 */
2077 target_bs = bdrv_new("");
2078 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
2079 &local_err);
2080 if (ret < 0) {
2081 bdrv_unref(target_bs);
2082 error_propagate(errp, local_err);
2083 return;
2084 }
2085
2086 mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
2087 on_source_error, on_target_error,
2088 block_job_cb, bs, &local_err);
2089 if (local_err != NULL) {
2090 bdrv_unref(target_bs);
2091 error_propagate(errp, local_err);
2092 return;
2093 }
2094 }
2095
2096 static BlockJob *find_block_job(const char *device)
2097 {
2098 BlockDriverState *bs;
2099
2100 bs = bdrv_find(device);
2101 if (!bs || !bs->job) {
2102 return NULL;
2103 }
2104 return bs->job;
2105 }
2106
2107 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2108 {
2109 BlockJob *job = find_block_job(device);
2110
2111 if (!job) {
2112 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2113 return;
2114 }
2115
2116 block_job_set_speed(job, speed, errp);
2117 }
2118
2119 void qmp_block_job_cancel(const char *device,
2120 bool has_force, bool force, Error **errp)
2121 {
2122 BlockJob *job = find_block_job(device);
2123
2124 if (!has_force) {
2125 force = false;
2126 }
2127
2128 if (!job) {
2129 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2130 return;
2131 }
2132 if (job->paused && !force) {
2133 error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
2134 return;
2135 }
2136
2137 trace_qmp_block_job_cancel(job);
2138 block_job_cancel(job);
2139 }
2140
2141 void qmp_block_job_pause(const char *device, Error **errp)
2142 {
2143 BlockJob *job = find_block_job(device);
2144
2145 if (!job) {
2146 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2147 return;
2148 }
2149
2150 trace_qmp_block_job_pause(job);
2151 block_job_pause(job);
2152 }
2153
2154 void qmp_block_job_resume(const char *device, Error **errp)
2155 {
2156 BlockJob *job = find_block_job(device);
2157
2158 if (!job) {
2159 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2160 return;
2161 }
2162
2163 trace_qmp_block_job_resume(job);
2164 block_job_resume(job);
2165 }
2166
2167 void qmp_block_job_complete(const char *device, Error **errp)
2168 {
2169 BlockJob *job = find_block_job(device);
2170
2171 if (!job) {
2172 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2173 return;
2174 }
2175
2176 trace_qmp_block_job_complete(job);
2177 block_job_complete(job, errp);
2178 }
2179
2180 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2181 {
2182 QmpOutputVisitor *ov = qmp_output_visitor_new();
2183 QObject *obj;
2184 QDict *qdict;
2185 Error *local_err = NULL;
2186
2187 /* Require an ID in the top level */
2188 if (!options->has_id) {
2189 error_setg(errp, "Block device needs an ID");
2190 goto fail;
2191 }
2192
2193 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with
2194 * cache.direct=false instead of silently switching to aio=threads, except
2195 * if called from drive_init.
2196 *
2197 * For now, simply forbidding the combination for all drivers will do. */
2198 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2199 bool direct = options->cache->has_direct && options->cache->direct;
2200 if (!options->has_cache && !direct) {
2201 error_setg(errp, "aio=native requires cache.direct=true");
2202 goto fail;
2203 }
2204 }
2205
2206 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2207 &options, NULL, &local_err);
2208 if (error_is_set(&local_err)) {
2209 error_propagate(errp, local_err);
2210 goto fail;
2211 }
2212
2213 obj = qmp_output_get_qobject(ov);
2214 qdict = qobject_to_qdict(obj);
2215
2216 qdict_flatten(qdict);
2217
2218 blockdev_init(NULL, qdict, IF_NONE, &local_err);
2219 if (error_is_set(&local_err)) {
2220 error_propagate(errp, local_err);
2221 goto fail;
2222 }
2223
2224 fail:
2225 qmp_output_visitor_cleanup(ov);
2226 }
2227
2228 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2229 {
2230 BlockJobInfoList **prev = opaque;
2231 BlockJob *job = bs->job;
2232
2233 if (job) {
2234 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2235 elem->value = block_job_query(bs->job);
2236 (*prev)->next = elem;
2237 *prev = elem;
2238 }
2239 }
2240
2241 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2242 {
2243 /* Dummy is a fake list element for holding the head pointer */
2244 BlockJobInfoList dummy = {};
2245 BlockJobInfoList *prev = &dummy;
2246 bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2247 return dummy.next;
2248 }
2249
2250 QemuOptsList qemu_common_drive_opts = {
2251 .name = "drive",
2252 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2253 .desc = {
2254 {
2255 .name = "snapshot",
2256 .type = QEMU_OPT_BOOL,
2257 .help = "enable/disable snapshot mode",
2258 },{
2259 .name = "discard",
2260 .type = QEMU_OPT_STRING,
2261 .help = "discard operation (ignore/off, unmap/on)",
2262 },{
2263 .name = "cache.writeback",
2264 .type = QEMU_OPT_BOOL,
2265 .help = "enables writeback mode for any caches",
2266 },{
2267 .name = "cache.direct",
2268 .type = QEMU_OPT_BOOL,
2269 .help = "enables use of O_DIRECT (bypass the host page cache)",
2270 },{
2271 .name = "cache.no-flush",
2272 .type = QEMU_OPT_BOOL,
2273 .help = "ignore any flush requests for the device",
2274 },{
2275 .name = "aio",
2276 .type = QEMU_OPT_STRING,
2277 .help = "host AIO implementation (threads, native)",
2278 },{
2279 .name = "format",
2280 .type = QEMU_OPT_STRING,
2281 .help = "disk format (raw, qcow2, ...)",
2282 },{
2283 .name = "serial",
2284 .type = QEMU_OPT_STRING,
2285 .help = "disk serial number",
2286 },{
2287 .name = "rerror",
2288 .type = QEMU_OPT_STRING,
2289 .help = "read error action",
2290 },{
2291 .name = "werror",
2292 .type = QEMU_OPT_STRING,
2293 .help = "write error action",
2294 },{
2295 .name = "read-only",
2296 .type = QEMU_OPT_BOOL,
2297 .help = "open drive file as read-only",
2298 },{
2299 .name = "throttling.iops-total",
2300 .type = QEMU_OPT_NUMBER,
2301 .help = "limit total I/O operations per second",
2302 },{
2303 .name = "throttling.iops-read",
2304 .type = QEMU_OPT_NUMBER,
2305 .help = "limit read operations per second",
2306 },{
2307 .name = "throttling.iops-write",
2308 .type = QEMU_OPT_NUMBER,
2309 .help = "limit write operations per second",
2310 },{
2311 .name = "throttling.bps-total",
2312 .type = QEMU_OPT_NUMBER,
2313 .help = "limit total bytes per second",
2314 },{
2315 .name = "throttling.bps-read",
2316 .type = QEMU_OPT_NUMBER,
2317 .help = "limit read bytes per second",
2318 },{
2319 .name = "throttling.bps-write",
2320 .type = QEMU_OPT_NUMBER,
2321 .help = "limit write bytes per second",
2322 },{
2323 .name = "throttling.iops-total-max",
2324 .type = QEMU_OPT_NUMBER,
2325 .help = "I/O operations burst",
2326 },{
2327 .name = "throttling.iops-read-max",
2328 .type = QEMU_OPT_NUMBER,
2329 .help = "I/O operations read burst",
2330 },{
2331 .name = "throttling.iops-write-max",
2332 .type = QEMU_OPT_NUMBER,
2333 .help = "I/O operations write burst",
2334 },{
2335 .name = "throttling.bps-total-max",
2336 .type = QEMU_OPT_NUMBER,
2337 .help = "total bytes burst",
2338 },{
2339 .name = "throttling.bps-read-max",
2340 .type = QEMU_OPT_NUMBER,
2341 .help = "total bytes read burst",
2342 },{
2343 .name = "throttling.bps-write-max",
2344 .type = QEMU_OPT_NUMBER,
2345 .help = "total bytes write burst",
2346 },{
2347 .name = "throttling.iops-size",
2348 .type = QEMU_OPT_NUMBER,
2349 .help = "when limiting by iops max size of an I/O in bytes",
2350 },{
2351 .name = "copy-on-read",
2352 .type = QEMU_OPT_BOOL,
2353 .help = "copy read data from backing file into image file",
2354 },
2355 { /* end of list */ }
2356 },
2357 };
2358
2359 QemuOptsList qemu_drive_opts = {
2360 .name = "drive",
2361 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2362 .desc = {
2363 /*
2364 * no elements => accept any params
2365 * validation will happen later
2366 */
2367 { /* end of list */ }
2368 },
2369 };
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