blockdev.c 20.2 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
/*
 * 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.
 */

#include "block.h"
#include "blockdev.h"
#include "monitor.h"
#include "qerror.h"
#include "qemu-option.h"
#include "qemu-config.h"
#include "sysemu.h"
17
18
#include "hw/qdev.h"
#include "block_int.h"
19

20
static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
21

22
23
24
25
26
27
28
29
30
31
32
33
34
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] = {
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
    /*
     * 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,
51
52
};

53
54
55
56
57
58
59
60
61
62
63
/*
 * 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);

64
65
66
    if (dinfo) {
        dinfo->auto_del = 1;
    }
67
68
69
70
71
72
}

void blockdev_auto_del(BlockDriverState *bs)
{
    DriveInfo *dinfo = drive_get_by_blockdev(bs);

73
    if (dinfo && dinfo->auto_del) {
74
75
76
77
        drive_uninit(dinfo);
    }
}

78
79
80
81
82
83
84
85
86
87
88
89
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;
}

90
91
92
93
94
95
96
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 *fmt, ...)
97
98
99
100
{
    va_list ap;
    char optstr[1024];
    QemuOpts *opts;
101
    char buf[32];
102
103
104
105
106

    va_start(ap, fmt);
    vsnprintf(optstr, sizeof(optstr), fmt, ap);
    va_end(ap);

107
    opts = drive_def(optstr);
108
109
110
    if (!opts) {
        return NULL;
    }
111
112
113
114
115
116
117
    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);
    }
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
    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;
}

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;
}

153
154
155
156
157
158
159
160
161
162
/* 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]++);
}

163
DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
164
165
166
167
{
    DriveInfo *dinfo;

    QTAILQ_FOREACH(dinfo, &drives, next) {
168
169
170
        if (dinfo->bdrv == bs) {
            return dinfo;
        }
171
    }
172
    return NULL;
173
174
175
176
}

static void bdrv_format_print(void *opaque, const char *name)
{
177
    error_printf(" %s", name);
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
}

void drive_uninit(DriveInfo *dinfo)
{
    qemu_opts_del(dinfo->opts);
    bdrv_delete(dinfo->bdrv);
    QTAILQ_REMOVE(&drives, dinfo, next);
    qemu_free(dinfo);
}

static int parse_block_error_action(const char *buf, int is_read)
{
    if (!strcmp(buf, "ignore")) {
        return BLOCK_ERR_IGNORE;
    } else if (!is_read && !strcmp(buf, "enospc")) {
        return BLOCK_ERR_STOP_ENOSPC;
    } else if (!strcmp(buf, "stop")) {
        return BLOCK_ERR_STOP_ANY;
    } else if (!strcmp(buf, "report")) {
        return BLOCK_ERR_REPORT;
    } else {
199
200
        error_report("'%s' invalid %s error action",
                     buf, is_read ? "read" : "write");
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
        return -1;
    }
}

DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi, int *fatal_error)
{
    const char *buf;
    const char *file = NULL;
    char devname[128];
    const char *serial;
    const char *mediastr = "";
    BlockInterfaceType type;
    enum { MEDIA_DISK, MEDIA_CDROM } media;
    int bus_id, unit_id;
    int cyls, heads, secs, translation;
    BlockDriver *drv = NULL;
    int max_devs;
    int index;
    int ro = 0;
    int bdrv_flags = 0;
    int on_read_error, on_write_error;
    const char *devaddr;
    DriveInfo *dinfo;
    int snapshot = 0;
    int ret;

    *fatal_error = 1;

    translation = BIOS_ATA_TRANSLATION_AUTO;

    if (default_to_scsi) {
        type = IF_SCSI;
        pstrcpy(devname, sizeof(devname), "scsi");
    } else {
        type = IF_IDE;
        pstrcpy(devname, sizeof(devname), "ide");
    }
    media = MEDIA_DISK;

    /* 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, "readonly", 0);

    file = qemu_opt_get(opts, "file");
    serial = qemu_opt_get(opts, "serial");

    if ((buf = qemu_opt_get(opts, "if")) != NULL) {
        pstrcpy(devname, sizeof(devname), buf);
257
258
259
        for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
            ;
        if (type == IF_COUNT) {
260
            error_report("unsupported bus type '%s'", buf);
261
262
263
            return NULL;
	}
    }
264
    max_devs = if_max_devs[type];
265
266
267

    if (cyls || heads || secs) {
        if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
268
            error_report("invalid physical cyls number");
269
270
271
	    return NULL;
	}
        if (heads < 1 || (type == IF_IDE && heads > 16)) {
272
            error_report("invalid physical heads number");
273
274
275
	    return NULL;
	}
        if (secs < 1 || (type == IF_IDE && secs > 63)) {
276
            error_report("invalid physical secs number");
277
278
279
280
281
282
	    return NULL;
	}
    }

    if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
        if (!cyls) {
283
284
            error_report("'%s' trans must be used with cyls,heads and secs",
                         buf);
285
286
287
288
289
290
291
292
293
            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 {
294
            error_report("'%s' invalid translation type", buf);
295
296
297
298
299
300
301
302
303
	    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) {
304
                error_report("'%s' invalid physical CHS format", buf);
305
306
307
308
	        return NULL;
            }
	    media = MEDIA_CDROM;
	} else {
309
	    error_report("'%s' invalid media", buf);
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
	    return NULL;
	}
    }

    if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
        if (!strcmp(buf, "off") || !strcmp(buf, "none")) {
            bdrv_flags |= BDRV_O_NOCACHE;
        } else if (!strcmp(buf, "writeback")) {
            bdrv_flags |= BDRV_O_CACHE_WB;
        } else if (!strcmp(buf, "unsafe")) {
            bdrv_flags |= BDRV_O_CACHE_WB;
            bdrv_flags |= BDRV_O_NO_FLUSH;
        } else if (!strcmp(buf, "writethrough")) {
            /* this is the default */
        } else {
325
           error_report("invalid cache option");
326
327
328
329
330
331
332
333
334
335
336
           return NULL;
        }
    }

#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 {
337
           error_report("invalid aio option");
338
339
340
341
342
343
344
           return NULL;
        }
    }
#endif

    if ((buf = qemu_opt_get(opts, "format")) != NULL) {
       if (strcmp(buf, "?") == 0) {
345
346
347
348
           error_printf("Supported formats:");
           bdrv_iterate_format(bdrv_format_print, NULL);
           error_printf("\n");
           return NULL;
349
350
351
        }
        drv = bdrv_find_whitelisted_format(buf);
        if (!drv) {
352
            error_report("'%s' invalid format", buf);
353
354
355
356
357
358
359
            return NULL;
        }
    }

    on_write_error = BLOCK_ERR_STOP_ENOSPC;
    if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
        if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
360
            error_report("werror is not supported by this bus type");
361
362
363
364
365
366
367
368
369
370
371
            return NULL;
        }

        on_write_error = parse_block_error_action(buf, 0);
        if (on_write_error < 0) {
            return NULL;
        }
    }

    on_read_error = BLOCK_ERR_REPORT;
    if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
372
        if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
373
            error_report("rerror is not supported by this bus type");
374
375
376
377
378
379
380
381
382
383
384
            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) {
385
            error_report("addr is not supported by this bus type");
386
387
388
389
390
391
392
393
            return NULL;
        }
    }

    /* compute bus and unit according index */

    if (index != -1) {
        if (bus_id != 0 || unit_id != -1) {
394
            error_report("index cannot be used with bus and unit");
395
396
            return NULL;
        }
397
398
        bus_id = drive_index_to_bus_id(type, index);
        unit_id = drive_index_to_unit_id(type, index);
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
    }

    /* 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) {
419
420
        error_report("unit %d too big (max is %d)",
                     unit_id, max_devs - 1);
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
        return NULL;
    }

    /*
     * ignore multiple definitions
     */

    if (drive_get(type, bus_id, unit_id) != NULL) {
        *fatal_error = 0;
        return NULL;
    }

    /* init */

    dinfo = qemu_mallocz(sizeof(*dinfo));
    if ((buf = qemu_opts_id(opts)) != NULL) {
        dinfo->id = qemu_strdup(buf);
    } else {
        /* no id supplied -> create one */
        dinfo->id = qemu_mallocz(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",
                     devname, bus_id, mediastr, unit_id);
        else
            snprintf(dinfo->id, 32, "%s%s%i",
                     devname, mediastr, unit_id);
    }
    dinfo->bdrv = bdrv_new(dinfo->id);
    dinfo->devaddr = devaddr;
    dinfo->type = type;
    dinfo->bus = bus_id;
    dinfo->unit = unit_id;
    dinfo->opts = opts;
    if (serial)
457
        strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
458
459
    QTAILQ_INSERT_TAIL(&drives, dinfo, next);

460
461
    bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);

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
    switch(type) {
    case IF_IDE:
    case IF_SCSI:
    case IF_XEN:
    case IF_NONE:
        switch(media) {
	case MEDIA_DISK:
            if (cyls != 0) {
                bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
                bdrv_set_translation_hint(dinfo->bdrv, translation);
            }
	    break;
	case MEDIA_CDROM:
            bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
	    break;
	}
        break;
    case IF_SD:
        /* FIXME: This isn't really a floppy, but it's a reasonable
           approximation.  */
    case IF_FLOPPY:
        bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
        break;
    case IF_PFLASH:
    case IF_MTD:
        break;
    case IF_VIRTIO:
        /* add virtio block device */
490
        opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
491
492
493
494
495
        qemu_opt_set(opts, "driver", "virtio-blk-pci");
        qemu_opt_set(opts, "drive", dinfo->id);
        if (devaddr)
            qemu_opt_set(opts, "addr", devaddr);
        break;
496
    default:
497
498
        abort();
    }
499
    if (!file || !*file) {
500
501
502
503
504
505
506
507
508
509
510
511
512
513
        *fatal_error = 0;
        return NULL;
    }
    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 (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) {
514
            error_report("readonly not supported by this bus type");
515
516
517
518
519
520
521
522
            return NULL;
        }
    }

    bdrv_flags |= ro ? 0 : BDRV_O_RDWR;

    ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
    if (ret < 0) {
523
524
        error_report("could not open disk image %s: %s",
                     file, strerror(-ret));
525
526
527
528
529
530
531
532
533
534
535
536
        return NULL;
    }

    if (bdrv_key_required(dinfo->bdrv))
        autostart = 0;
    *fatal_error = 0;
    return dinfo;
}

void do_commit(Monitor *mon, const QDict *qdict)
{
    const char *device = qdict_get_str(qdict, "device");
537
    BlockDriverState *bs;
538

539
540
541
542
    if (!strcmp(device, "all")) {
        bdrv_commit_all();
    } else {
        bs = bdrv_find(device);
543
544
545
        if (!bs) {
            qerror_report(QERR_DEVICE_NOT_FOUND, device);
            return;
546
        }
547
        bdrv_commit(bs);
548
549
550
    }
}

551
552
553
554
555
556
557
558
559
560
int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
    const char *device = qdict_get_str(qdict, "device");
    const char *filename = qdict_get_try_str(qdict, "snapshot_file");
    const char *format = qdict_get_try_str(qdict, "format");
    BlockDriverState *bs;
    BlockDriver *drv, *proto_drv;
    int ret = 0;
    int flags;

561
562
563
564
565
566
    if (!filename) {
        qerror_report(QERR_MISSING_PARAMETER, "snapshot_file");
        ret = -1;
        goto out;
    }

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
    bs = bdrv_find(device);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, device);
        ret = -1;
        goto out;
    }

    if (!format) {
        format = "qcow2";
    }

    drv = bdrv_find_format(format);
    if (!drv) {
        qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
        ret = -1;
        goto out;
    }

    proto_drv = bdrv_find_protocol(filename);
    if (!proto_drv) {
        qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
        ret = -1;
        goto out;
    }

    ret = bdrv_img_create(filename, format, bs->filename,
                          bs->drv->format_name, NULL, -1, bs->open_flags);
    if (ret) {
        goto out;
    }

    qemu_aio_flush();
    bdrv_flush(bs);

    flags = bs->open_flags;
    bdrv_close(bs);
    ret = bdrv_open(bs, filename, flags, drv);
    /*
     * If reopening the image file we just created fails, we really
     * are in trouble :(
     */
    if (ret != 0) {
        abort();
    }
out:
    if (ret) {
        ret = -1;
    }

    return ret;
}

619
620
static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
{
621
622
623
624
625
626
627
628
629
    if (!force) {
        if (!bdrv_is_removable(bs)) {
            qerror_report(QERR_DEVICE_NOT_REMOVABLE,
                           bdrv_get_device_name(bs));
            return -1;
        }
        if (bdrv_is_locked(bs)) {
            qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
            return -1;
630
631
        }
    }
632
    bdrv_close(bs);
633
634
635
636
637
638
    return 0;
}

int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
    BlockDriverState *bs;
639
    int force = qdict_get_try_bool(qdict, "force", 0);
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
    const char *filename = qdict_get_str(qdict, "device");

    bs = bdrv_find(filename);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, filename);
        return -1;
    }
    return eject_device(mon, bs, force);
}

int do_block_set_passwd(Monitor *mon, const QDict *qdict,
                        QObject **ret_data)
{
    BlockDriverState *bs;
    int err;

    bs = bdrv_find(qdict_get_str(qdict, "device"));
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
        return -1;
    }

    err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
    if (err == -EINVAL) {
        qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
        return -1;
    } else if (err < 0) {
        qerror_report(QERR_INVALID_PASSWORD);
        return -1;
    }

    return 0;
}

int do_change_block(Monitor *mon, const char *device,
                    const char *filename, const char *fmt)
{
    BlockDriverState *bs;
    BlockDriver *drv = NULL;
    int bdrv_flags;

    bs = bdrv_find(device);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, device);
        return -1;
    }
    if (fmt) {
        drv = bdrv_find_whitelisted_format(fmt);
        if (!drv) {
            qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
            return -1;
        }
    }
    if (eject_device(mon, bs, 0) < 0) {
        return -1;
    }
696
    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
697
    bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
698
699
700
701
702
703
    if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
        qerror_report(QERR_OPEN_FILE_FAILED, filename);
        return -1;
    }
    return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
}
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724

int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
    const char *id = qdict_get_str(qdict, "id");
    BlockDriverState *bs;
    BlockDriverState **ptr;
    Property *prop;

    bs = bdrv_find(id);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, id);
        return -1;
    }

    /* quiesce block driver; prevent further io */
    qemu_aio_flush();
    bdrv_flush(bs);
    bdrv_close(bs);

    /* clean up guest state from pointing to host resource by
     * finding and removing DeviceState "drive" property */
725
726
727
728
729
730
731
732
733
    if (bs->peer) {
        for (prop = bs->peer->info->props; prop && prop->name; prop++) {
            if (prop->info->type == PROP_TYPE_DRIVE) {
                ptr = qdev_get_prop_ptr(bs->peer, prop);
                if (*ptr == bs) {
                    bdrv_detach(bs, bs->peer);
                    *ptr = NULL;
                    break;
                }
734
735
736
737
738
739
740
741
742
            }
        }
    }

    /* clean up host side */
    drive_uninit(drive_get_by_blockdev(bs));

    return 0;
}
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

/*
 * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
 * existing QERR_ macro mess is cleaned up.  A good example for better
 * error reports can be found in the qemu-img resize code.
 */
int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
    const char *device = qdict_get_str(qdict, "device");
    int64_t size = qdict_get_int(qdict, "size");
    BlockDriverState *bs;

    bs = bdrv_find(device);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, device);
        return -1;
    }

    if (size < 0) {
        qerror_report(QERR_UNDEFINED_ERROR);
        return -1;
    }

    if (bdrv_truncate(bs, size)) {
        qerror_report(QERR_UNDEFINED_ERROR);
        return -1;
    }

    return 0;
}