/
blockdev.c
2258 lines (1968 loc) · 63.9 KB
/
blockdev.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* QEMU host block devices
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "sysemu/blockdev.h"
#include "hw/block/block.h"
#include "block/blockjob.h"
#include "monitor/monitor.h"
#include "qapi/qmp/qerror.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qapi/qmp/types.h"
#include "sysemu/sysemu.h"
#include "block/block_int.h"
#include "qmp-commands.h"
#include "trace.h"
#include "sysemu/arch_init.h"
static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
extern QemuOptsList qemu_common_drive_opts;
static const char *const if_name[IF_COUNT] = {
[IF_NONE] = "none",
[IF_IDE] = "ide",
[IF_SCSI] = "scsi",
[IF_FLOPPY] = "floppy",
[IF_PFLASH] = "pflash",
[IF_MTD] = "mtd",
[IF_SD] = "sd",
[IF_VIRTIO] = "virtio",
[IF_XEN] = "xen",
};
static const int if_max_devs[IF_COUNT] = {
/*
* Do not change these numbers! They govern how drive option
* index maps to unit and bus. That mapping is ABI.
*
* All controllers used to imlement if=T drives need to support
* if_max_devs[T] units, for any T with if_max_devs[T] != 0.
* Otherwise, some index values map to "impossible" bus, unit
* values.
*
* For instance, if you change [IF_SCSI] to 255, -drive
* if=scsi,index=12 no longer means bus=1,unit=5, but
* bus=0,unit=12. With an lsi53c895a controller (7 units max),
* the drive can't be set up. Regression.
*/
[IF_IDE] = 2,
[IF_SCSI] = 7,
};
/*
* We automatically delete the drive when a device using it gets
* unplugged. Questionable feature, but we can't just drop it.
* Device models call blockdev_mark_auto_del() to schedule the
* automatic deletion, and generic qdev code calls blockdev_auto_del()
* when deletion is actually safe.
*/
void blockdev_mark_auto_del(BlockDriverState *bs)
{
DriveInfo *dinfo = drive_get_by_blockdev(bs);
if (dinfo && !dinfo->enable_auto_del) {
return;
}
if (bs->job) {
block_job_cancel(bs->job);
}
if (dinfo) {
dinfo->auto_del = 1;
}
}
void blockdev_auto_del(BlockDriverState *bs)
{
DriveInfo *dinfo = drive_get_by_blockdev(bs);
if (dinfo && dinfo->auto_del) {
drive_put_ref(dinfo);
}
}
static int drive_index_to_bus_id(BlockInterfaceType type, int index)
{
int max_devs = if_max_devs[type];
return max_devs ? index / max_devs : 0;
}
static int drive_index_to_unit_id(BlockInterfaceType type, int index)
{
int max_devs = if_max_devs[type];
return max_devs ? index % max_devs : index;
}
QemuOpts *drive_def(const char *optstr)
{
return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
}
QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
const char *optstr)
{
QemuOpts *opts;
char buf[32];
opts = drive_def(optstr);
if (!opts) {
return NULL;
}
if (type != IF_DEFAULT) {
qemu_opt_set(opts, "if", if_name[type]);
}
if (index >= 0) {
snprintf(buf, sizeof(buf), "%d", index);
qemu_opt_set(opts, "index", buf);
}
if (file)
qemu_opt_set(opts, "file", file);
return opts;
}
DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
{
DriveInfo *dinfo;
/* seek interface, bus and unit */
QTAILQ_FOREACH(dinfo, &drives, next) {
if (dinfo->type == type &&
dinfo->bus == bus &&
dinfo->unit == unit)
return dinfo;
}
return NULL;
}
DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
{
return drive_get(type,
drive_index_to_bus_id(type, index),
drive_index_to_unit_id(type, index));
}
int drive_get_max_bus(BlockInterfaceType type)
{
int max_bus;
DriveInfo *dinfo;
max_bus = -1;
QTAILQ_FOREACH(dinfo, &drives, next) {
if(dinfo->type == type &&
dinfo->bus > max_bus)
max_bus = dinfo->bus;
}
return max_bus;
}
/* Get a block device. This should only be used for single-drive devices
(e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
appropriate bus. */
DriveInfo *drive_get_next(BlockInterfaceType type)
{
static int next_block_unit[IF_COUNT];
return drive_get(type, 0, next_block_unit[type]++);
}
DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
{
DriveInfo *dinfo;
QTAILQ_FOREACH(dinfo, &drives, next) {
if (dinfo->bdrv == bs) {
return dinfo;
}
}
return NULL;
}
static void bdrv_format_print(void *opaque, const char *name)
{
error_printf(" %s", name);
}
static void drive_uninit(DriveInfo *dinfo)
{
qemu_opts_del(dinfo->opts);
bdrv_unref(dinfo->bdrv);
g_free(dinfo->id);
QTAILQ_REMOVE(&drives, dinfo, next);
g_free(dinfo->serial);
g_free(dinfo);
}
void drive_put_ref(DriveInfo *dinfo)
{
assert(dinfo->refcount);
if (--dinfo->refcount == 0) {
drive_uninit(dinfo);
}
}
void drive_get_ref(DriveInfo *dinfo)
{
dinfo->refcount++;
}
typedef struct {
QEMUBH *bh;
BlockDriverState *bs;
} BDRVPutRefBH;
static void bdrv_put_ref_bh(void *opaque)
{
BDRVPutRefBH *s = opaque;
bdrv_unref(s->bs);
qemu_bh_delete(s->bh);
g_free(s);
}
/*
* Release a BDS reference in a BH
*
* It is not safe to use bdrv_unref() from a callback function when the callers
* still need the BlockDriverState. In such cases we schedule a BH to release
* the reference.
*/
static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
{
BDRVPutRefBH *s;
s = g_new(BDRVPutRefBH, 1);
s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
s->bs = bs;
qemu_bh_schedule(s->bh);
}
static int parse_block_error_action(const char *buf, bool is_read)
{
if (!strcmp(buf, "ignore")) {
return BLOCKDEV_ON_ERROR_IGNORE;
} else if (!is_read && !strcmp(buf, "enospc")) {
return BLOCKDEV_ON_ERROR_ENOSPC;
} else if (!strcmp(buf, "stop")) {
return BLOCKDEV_ON_ERROR_STOP;
} else if (!strcmp(buf, "report")) {
return BLOCKDEV_ON_ERROR_REPORT;
} else {
error_report("'%s' invalid %s error action",
buf, is_read ? "read" : "write");
return -1;
}
}
static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
{
if (throttle_conflicting(cfg)) {
error_setg(errp, "bps/iops/max total values and read/write values"
" cannot be used at the same time");
return false;
}
if (!throttle_is_valid(cfg)) {
error_setg(errp, "bps/iops/maxs values must be 0 or greater");
return false;
}
return true;
}
static DriveInfo *blockdev_init(QemuOpts *all_opts,
BlockInterfaceType block_default_type)
{
const char *buf;
const char *file = NULL;
const char *serial;
const char *mediastr = "";
BlockInterfaceType type;
enum { MEDIA_DISK, MEDIA_CDROM } media;
int bus_id, unit_id;
int cyls, heads, secs, translation;
int max_devs;
int index;
int ro = 0;
int bdrv_flags = 0;
int on_read_error, on_write_error;
const char *devaddr;
DriveInfo *dinfo;
ThrottleConfig cfg;
int snapshot = 0;
bool copy_on_read;
int ret;
Error *error = NULL;
QemuOpts *opts;
QDict *bs_opts;
const char *id;
bool has_driver_specific_opts;
BlockDriver *drv = NULL;
translation = BIOS_ATA_TRANSLATION_AUTO;
media = MEDIA_DISK;
/* Check common options by copying from all_opts to opts, all other options
* are stored in bs_opts. */
id = qemu_opts_id(all_opts);
opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
if (error_is_set(&error)) {
qerror_report_err(error);
error_free(error);
return NULL;
}
bs_opts = qdict_new();
qemu_opts_to_qdict(all_opts, bs_opts);
qemu_opts_absorb_qdict(opts, bs_opts, &error);
if (error_is_set(&error)) {
qerror_report_err(error);
error_free(error);
return NULL;
}
if (id) {
qdict_del(bs_opts, "id");
}
has_driver_specific_opts = !!qdict_size(bs_opts);
/* extract parameters */
bus_id = qemu_opt_get_number(opts, "bus", 0);
unit_id = qemu_opt_get_number(opts, "unit", -1);
index = qemu_opt_get_number(opts, "index", -1);
cyls = qemu_opt_get_number(opts, "cyls", 0);
heads = qemu_opt_get_number(opts, "heads", 0);
secs = qemu_opt_get_number(opts, "secs", 0);
snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
ro = qemu_opt_get_bool(opts, "read-only", 0);
copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
file = qemu_opt_get(opts, "file");
serial = qemu_opt_get(opts, "serial");
if ((buf = qemu_opt_get(opts, "if")) != NULL) {
for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
;
if (type == IF_COUNT) {
error_report("unsupported bus type '%s'", buf);
return NULL;
}
} else {
type = block_default_type;
}
max_devs = if_max_devs[type];
if (cyls || heads || secs) {
if (cyls < 1) {
error_report("invalid physical cyls number");
return NULL;
}
if (heads < 1) {
error_report("invalid physical heads number");
return NULL;
}
if (secs < 1) {
error_report("invalid physical secs number");
return NULL;
}
}
if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
if (!cyls) {
error_report("'%s' trans must be used with cyls, heads and secs",
buf);
return NULL;
}
if (!strcmp(buf, "none"))
translation = BIOS_ATA_TRANSLATION_NONE;
else if (!strcmp(buf, "lba"))
translation = BIOS_ATA_TRANSLATION_LBA;
else if (!strcmp(buf, "auto"))
translation = BIOS_ATA_TRANSLATION_AUTO;
else {
error_report("'%s' invalid translation type", buf);
return NULL;
}
}
if ((buf = qemu_opt_get(opts, "media")) != NULL) {
if (!strcmp(buf, "disk")) {
media = MEDIA_DISK;
} else if (!strcmp(buf, "cdrom")) {
if (cyls || secs || heads) {
error_report("CHS can't be set with media=%s", buf);
return NULL;
}
media = MEDIA_CDROM;
} else {
error_report("'%s' invalid media", buf);
return NULL;
}
}
if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
error_report("invalid discard option");
return NULL;
}
}
if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
bdrv_flags |= BDRV_O_CACHE_WB;
}
if (qemu_opt_get_bool(opts, "cache.direct", false)) {
bdrv_flags |= BDRV_O_NOCACHE;
}
if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
bdrv_flags |= BDRV_O_NO_FLUSH;
}
#ifdef CONFIG_LINUX_AIO
if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
if (!strcmp(buf, "native")) {
bdrv_flags |= BDRV_O_NATIVE_AIO;
} else if (!strcmp(buf, "threads")) {
/* this is the default */
} else {
error_report("invalid aio option");
return NULL;
}
}
#endif
if ((buf = qemu_opt_get(opts, "format")) != NULL) {
if (is_help_option(buf)) {
error_printf("Supported formats:");
bdrv_iterate_format(bdrv_format_print, NULL);
error_printf("\n");
return NULL;
}
drv = bdrv_find_format(buf);
if (!drv) {
error_report("'%s' invalid format", buf);
return NULL;
}
}
/* disk I/O throttling */
memset(&cfg, 0, sizeof(cfg));
cfg.buckets[THROTTLE_BPS_TOTAL].avg =
qemu_opt_get_number(opts, "throttling.bps-total", 0);
cfg.buckets[THROTTLE_BPS_READ].avg =
qemu_opt_get_number(opts, "throttling.bps-read", 0);
cfg.buckets[THROTTLE_BPS_WRITE].avg =
qemu_opt_get_number(opts, "throttling.bps-write", 0);
cfg.buckets[THROTTLE_OPS_TOTAL].avg =
qemu_opt_get_number(opts, "throttling.iops-total", 0);
cfg.buckets[THROTTLE_OPS_READ].avg =
qemu_opt_get_number(opts, "throttling.iops-read", 0);
cfg.buckets[THROTTLE_OPS_WRITE].avg =
qemu_opt_get_number(opts, "throttling.iops-write", 0);
cfg.buckets[THROTTLE_BPS_TOTAL].max =
qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
cfg.buckets[THROTTLE_BPS_READ].max =
qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
cfg.buckets[THROTTLE_BPS_WRITE].max =
qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
cfg.buckets[THROTTLE_OPS_TOTAL].max =
qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
cfg.buckets[THROTTLE_OPS_READ].max =
qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
cfg.buckets[THROTTLE_OPS_WRITE].max =
qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
if (!check_throttle_config(&cfg, &error)) {
error_report("%s", error_get_pretty(error));
error_free(error);
return NULL;
}
if (qemu_opt_get(opts, "boot") != NULL) {
fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
"ignored. Future versions will reject this parameter. Please "
"update your scripts.\n");
}
on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
error_report("werror is not supported by this bus type");
return NULL;
}
on_write_error = parse_block_error_action(buf, 0);
if (on_write_error < 0) {
return NULL;
}
}
on_read_error = BLOCKDEV_ON_ERROR_REPORT;
if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
error_report("rerror is not supported by this bus type");
return NULL;
}
on_read_error = parse_block_error_action(buf, 1);
if (on_read_error < 0) {
return NULL;
}
}
if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
if (type != IF_VIRTIO) {
error_report("addr is not supported by this bus type");
return NULL;
}
}
/* compute bus and unit according index */
if (index != -1) {
if (bus_id != 0 || unit_id != -1) {
error_report("index cannot be used with bus and unit");
return NULL;
}
bus_id = drive_index_to_bus_id(type, index);
unit_id = drive_index_to_unit_id(type, index);
}
/* if user doesn't specify a unit_id,
* try to find the first free
*/
if (unit_id == -1) {
unit_id = 0;
while (drive_get(type, bus_id, unit_id) != NULL) {
unit_id++;
if (max_devs && unit_id >= max_devs) {
unit_id -= max_devs;
bus_id++;
}
}
}
/* check unit id */
if (max_devs && unit_id >= max_devs) {
error_report("unit %d too big (max is %d)",
unit_id, max_devs - 1);
return NULL;
}
/*
* catch multiple definitions
*/
if (drive_get(type, bus_id, unit_id) != NULL) {
error_report("drive with bus=%d, unit=%d (index=%d) exists",
bus_id, unit_id, index);
return NULL;
}
/* init */
dinfo = g_malloc0(sizeof(*dinfo));
if ((buf = qemu_opts_id(opts)) != NULL) {
dinfo->id = g_strdup(buf);
} else {
/* no id supplied -> create one */
dinfo->id = g_malloc0(32);
if (type == IF_IDE || type == IF_SCSI)
mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
if (max_devs)
snprintf(dinfo->id, 32, "%s%i%s%i",
if_name[type], bus_id, mediastr, unit_id);
else
snprintf(dinfo->id, 32, "%s%s%i",
if_name[type], mediastr, unit_id);
}
dinfo->bdrv = bdrv_new(dinfo->id);
dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
dinfo->bdrv->read_only = ro;
dinfo->devaddr = devaddr;
dinfo->type = type;
dinfo->bus = bus_id;
dinfo->unit = unit_id;
dinfo->cyls = cyls;
dinfo->heads = heads;
dinfo->secs = secs;
dinfo->trans = translation;
dinfo->opts = all_opts;
dinfo->refcount = 1;
if (serial != NULL) {
dinfo->serial = g_strdup(serial);
}
QTAILQ_INSERT_TAIL(&drives, dinfo, next);
bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
/* disk I/O throttling */
if (throttle_enabled(&cfg)) {
bdrv_io_limits_enable(dinfo->bdrv);
bdrv_set_io_limits(dinfo->bdrv, &cfg);
}
switch(type) {
case IF_IDE:
case IF_SCSI:
case IF_XEN:
case IF_NONE:
dinfo->media_cd = media == MEDIA_CDROM;
break;
case IF_SD:
case IF_FLOPPY:
case IF_PFLASH:
case IF_MTD:
break;
case IF_VIRTIO:
{
/* add virtio block device */
QemuOpts *devopts;
devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
if (arch_type == QEMU_ARCH_S390X) {
qemu_opt_set(devopts, "driver", "virtio-blk-s390");
} else {
qemu_opt_set(devopts, "driver", "virtio-blk-pci");
}
qemu_opt_set(devopts, "drive", dinfo->id);
if (devaddr)
qemu_opt_set(devopts, "addr", devaddr);
break;
}
default:
abort();
}
if (!file || !*file) {
if (has_driver_specific_opts) {
file = NULL;
} else {
return dinfo;
}
}
if (snapshot) {
/* always use cache=unsafe with snapshot */
bdrv_flags &= ~BDRV_O_CACHE_MASK;
bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
}
if (copy_on_read) {
bdrv_flags |= BDRV_O_COPY_ON_READ;
}
if (runstate_check(RUN_STATE_INMIGRATE)) {
bdrv_flags |= BDRV_O_INCOMING;
}
if (media == MEDIA_CDROM) {
/* CDROM is fine for any interface, don't check. */
ro = 1;
} else if (ro == 1) {
if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
type != IF_NONE && type != IF_PFLASH) {
error_report("read-only not supported by this bus type");
goto err;
}
}
bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
if (ro && copy_on_read) {
error_report("warning: disabling copy_on_read on read-only drive");
}
QINCREF(bs_opts);
ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
if (ret < 0) {
error_report("could not open disk image %s: %s",
file ?: dinfo->id, error_get_pretty(error));
goto err;
}
if (bdrv_key_required(dinfo->bdrv))
autostart = 0;
QDECREF(bs_opts);
qemu_opts_del(opts);
return dinfo;
err:
qemu_opts_del(opts);
QDECREF(bs_opts);
bdrv_unref(dinfo->bdrv);
g_free(dinfo->id);
QTAILQ_REMOVE(&drives, dinfo, next);
g_free(dinfo);
return NULL;
}
static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
{
const char *value;
value = qemu_opt_get(opts, from);
if (value) {
qemu_opt_set(opts, to, value);
qemu_opt_unset(opts, from);
}
}
DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
{
const char *value;
DriveInfo *dinfo;
/* Change legacy command line options into QMP ones */
qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
qemu_opt_rename(all_opts,
"iops_size", "throttling.iops-size");
qemu_opt_rename(all_opts, "readonly", "read-only");
value = qemu_opt_get(all_opts, "cache");
if (value) {
int flags = 0;
if (bdrv_parse_cache_flags(value, &flags) != 0) {
error_report("invalid cache option");
return NULL;
}
/* Specific options take precedence */
if (!qemu_opt_get(all_opts, "cache.writeback")) {
qemu_opt_set_bool(all_opts, "cache.writeback",
!!(flags & BDRV_O_CACHE_WB));
}
if (!qemu_opt_get(all_opts, "cache.direct")) {
qemu_opt_set_bool(all_opts, "cache.direct",
!!(flags & BDRV_O_NOCACHE));
}
if (!qemu_opt_get(all_opts, "cache.no-flush")) {
qemu_opt_set_bool(all_opts, "cache.no-flush",
!!(flags & BDRV_O_NO_FLUSH));
}
qemu_opt_unset(all_opts, "cache");
}
/* Actual block device init: Functionality shared with blockdev-add */
dinfo = blockdev_init(all_opts, block_default_type);
if (dinfo == NULL) {
goto fail;
}
/* Set legacy DriveInfo fields */
dinfo->enable_auto_del = true;
fail:
return dinfo;
}
void do_commit(Monitor *mon, const QDict *qdict)
{
const char *device = qdict_get_str(qdict, "device");
BlockDriverState *bs;
int ret;
if (!strcmp(device, "all")) {
ret = bdrv_commit_all();
} else {
bs = bdrv_find(device);
if (!bs) {
monitor_printf(mon, "Device '%s' not found\n", device);
return;
}
ret = bdrv_commit(bs);
}
if (ret < 0) {
monitor_printf(mon, "'commit' error for '%s': %s\n", device,
strerror(-ret));
}
}
static void blockdev_do_action(int kind, void *data, Error **errp)
{
TransactionAction action;
TransactionActionList list;
action.kind = kind;
action.data = data;
list.value = &action;
list.next = NULL;
qmp_transaction(&list, errp);
}
void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
bool has_format, const char *format,
bool has_mode, enum NewImageMode mode,
Error **errp)
{
BlockdevSnapshot snapshot = {
.device = (char *) device,
.snapshot_file = (char *) snapshot_file,
.has_format = has_format,
.format = (char *) format,
.has_mode = has_mode,
.mode = mode,
};
blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
&snapshot, errp);
}
void qmp_blockdev_snapshot_internal_sync(const char *device,
const char *name,
Error **errp)
{
BlockdevSnapshotInternal snapshot = {
.device = (char *) device,
.name = (char *) name
};
blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
&snapshot, errp);
}
SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
bool has_id,
const char *id,
bool has_name,
const char *name,
Error **errp)
{
BlockDriverState *bs = bdrv_find(device);
QEMUSnapshotInfo sn;
Error *local_err = NULL;
SnapshotInfo *info = NULL;
int ret;
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return NULL;
}
if (!has_id) {
id = NULL;
}
if (!has_name) {
name = NULL;
}
if (!id && !name) {
error_setg(errp, "Name or id must be provided");
return NULL;
}
ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return NULL;
}
if (!ret) {
error_setg(errp,
"Snapshot with id '%s' and name '%s' does not exist on "
"device '%s'",
STR_OR_NULL(id), STR_OR_NULL(name), device);
return NULL;
}
bdrv_snapshot_delete(bs, id, name, &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return NULL;
}
info = g_malloc0(sizeof(SnapshotInfo));
info->id = g_strdup(sn.id_str);
info->name = g_strdup(sn.name);
info->date_nsec = sn.date_nsec;
info->date_sec = sn.date_sec;
info->vm_state_size = sn.vm_state_size;
info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
return info;
}
/* New and old BlockDriverState structs for group snapshots */
typedef struct BlkTransactionState BlkTransactionState;
/* Only prepare() may fail. In a single transaction, only one of commit() or
abort() will be called, clean() will always be called if it present. */
typedef struct BdrvActionOps {
/* Size of state struct, in bytes. */
size_t instance_size;
/* Prepare the work, must NOT be NULL. */
void (*prepare)(BlkTransactionState *common, Error **errp);
/* Commit the changes, can be NULL. */
void (*commit)(BlkTransactionState *common);
/* Abort the changes on fail, can be NULL. */
void (*abort)(BlkTransactionState *common);
/* Clean up resource in the end, can be NULL. */
void (*clean)(BlkTransactionState *common);
} BdrvActionOps;
/*
* This structure must be arranged as first member in child type, assuming
* that compiler will also arrange it to the same address with parent instance.
* Later it will be used in free().
*/
struct BlkTransactionState {
TransactionAction *action;
const BdrvActionOps *ops;
QSIMPLEQ_ENTRY(BlkTransactionState) entry;
};
/* internal snapshot private data */
typedef struct InternalSnapshotState {
BlkTransactionState common;
BlockDriverState *bs;
QEMUSnapshotInfo sn;
} InternalSnapshotState;
static void internal_snapshot_prepare(BlkTransactionState *common,
Error **errp)
{
const char *device;
const char *name;
BlockDriverState *bs;
QEMUSnapshotInfo old_sn, *sn;
bool ret;
qemu_timeval tv;
BlockdevSnapshotInternal *internal;
InternalSnapshotState *state;
int ret1;
g_assert(common->action->kind ==
TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
internal = common->action->blockdev_snapshot_internal_sync;
state = DO_UPCAST(InternalSnapshotState, common, common);
/* 1. parse input */
device = internal->device;
name = internal->name;
/* 2. check for validation */