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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

    
10
#include "block.h"
11
#include "blockdev.h"
12
#include "monitor.h"
13
#include "qerror.h"
14
#include "qemu-option.h"
15
#include "qemu-config.h"
16
#include "sysemu.h"
17

    
18
static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
19

    
20
/*
21
 * We automatically delete the drive when a device using it gets
22
 * unplugged.  Questionable feature, but we can't just drop it.
23
 * Device models call blockdev_mark_auto_del() to schedule the
24
 * automatic deletion, and generic qdev code calls blockdev_auto_del()
25
 * when deletion is actually safe.
26
 */
27
void blockdev_mark_auto_del(BlockDriverState *bs)
28
{
29
    DriveInfo *dinfo = drive_get_by_blockdev(bs);
30

    
31
    dinfo->auto_del = 1;
32
}
33

    
34
void blockdev_auto_del(BlockDriverState *bs)
35
{
36
    DriveInfo *dinfo = drive_get_by_blockdev(bs);
37

    
38
    if (dinfo->auto_del) {
39
        drive_uninit(dinfo);
40
    }
41
}
42

    
43
QemuOpts *drive_add(const char *file, const char *fmt, ...)
44
{
45
    va_list ap;
46
    char optstr[1024];
47
    QemuOpts *opts;
48

    
49
    va_start(ap, fmt);
50
    vsnprintf(optstr, sizeof(optstr), fmt, ap);
51
    va_end(ap);
52

    
53
    opts = qemu_opts_parse(&qemu_drive_opts, optstr, 0);
54
    if (!opts) {
55
        return NULL;
56
    }
57
    if (file)
58
        qemu_opt_set(opts, "file", file);
59
    return opts;
60
}
61

    
62
DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
63
{
64
    DriveInfo *dinfo;
65

    
66
    /* seek interface, bus and unit */
67

    
68
    QTAILQ_FOREACH(dinfo, &drives, next) {
69
        if (dinfo->type == type &&
70
            dinfo->bus == bus &&
71
            dinfo->unit == unit)
72
            return dinfo;
73
    }
74

    
75
    return NULL;
76
}
77

    
78
int drive_get_max_bus(BlockInterfaceType type)
79
{
80
    int max_bus;
81
    DriveInfo *dinfo;
82

    
83
    max_bus = -1;
84
    QTAILQ_FOREACH(dinfo, &drives, next) {
85
        if(dinfo->type == type &&
86
           dinfo->bus > max_bus)
87
            max_bus = dinfo->bus;
88
    }
89
    return max_bus;
90
}
91

    
92
DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
93
{
94
    DriveInfo *dinfo;
95

    
96
    QTAILQ_FOREACH(dinfo, &drives, next) {
97
        if (dinfo->bdrv == bs) {
98
            return dinfo;
99
        }
100
    }
101
    return NULL;
102
}
103

    
104
static void bdrv_format_print(void *opaque, const char *name)
105
{
106
    fprintf(stderr, " %s", name);
107
}
108

    
109
void drive_uninit(DriveInfo *dinfo)
110
{
111
    qemu_opts_del(dinfo->opts);
112
    bdrv_delete(dinfo->bdrv);
113
    QTAILQ_REMOVE(&drives, dinfo, next);
114
    qemu_free(dinfo);
115
}
116

    
117
static int parse_block_error_action(const char *buf, int is_read)
118
{
119
    if (!strcmp(buf, "ignore")) {
120
        return BLOCK_ERR_IGNORE;
121
    } else if (!is_read && !strcmp(buf, "enospc")) {
122
        return BLOCK_ERR_STOP_ENOSPC;
123
    } else if (!strcmp(buf, "stop")) {
124
        return BLOCK_ERR_STOP_ANY;
125
    } else if (!strcmp(buf, "report")) {
126
        return BLOCK_ERR_REPORT;
127
    } else {
128
        fprintf(stderr, "qemu: '%s' invalid %s error action\n",
129
            buf, is_read ? "read" : "write");
130
        return -1;
131
    }
132
}
133

    
134
DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi, int *fatal_error)
135
{
136
    const char *buf;
137
    const char *file = NULL;
138
    char devname[128];
139
    const char *serial;
140
    const char *mediastr = "";
141
    BlockInterfaceType type;
142
    enum { MEDIA_DISK, MEDIA_CDROM } media;
143
    int bus_id, unit_id;
144
    int cyls, heads, secs, translation;
145
    BlockDriver *drv = NULL;
146
    int max_devs;
147
    int index;
148
    int ro = 0;
149
    int bdrv_flags = 0;
150
    int on_read_error, on_write_error;
151
    const char *devaddr;
152
    DriveInfo *dinfo;
153
    int snapshot = 0;
154
    int ret;
155

    
156
    *fatal_error = 1;
157

    
158
    translation = BIOS_ATA_TRANSLATION_AUTO;
159

    
160
    if (default_to_scsi) {
161
        type = IF_SCSI;
162
        max_devs = MAX_SCSI_DEVS;
163
        pstrcpy(devname, sizeof(devname), "scsi");
164
    } else {
165
        type = IF_IDE;
166
        max_devs = MAX_IDE_DEVS;
167
        pstrcpy(devname, sizeof(devname), "ide");
168
    }
169
    media = MEDIA_DISK;
170

    
171
    /* extract parameters */
172
    bus_id  = qemu_opt_get_number(opts, "bus", 0);
173
    unit_id = qemu_opt_get_number(opts, "unit", -1);
174
    index   = qemu_opt_get_number(opts, "index", -1);
175

    
176
    cyls  = qemu_opt_get_number(opts, "cyls", 0);
177
    heads = qemu_opt_get_number(opts, "heads", 0);
178
    secs  = qemu_opt_get_number(opts, "secs", 0);
179

    
180
    snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
181
    ro = qemu_opt_get_bool(opts, "readonly", 0);
182

    
183
    file = qemu_opt_get(opts, "file");
184
    serial = qemu_opt_get(opts, "serial");
185

    
186
    if ((buf = qemu_opt_get(opts, "if")) != NULL) {
187
        pstrcpy(devname, sizeof(devname), buf);
188
        if (!strcmp(buf, "ide")) {
189
            type = IF_IDE;
190
            max_devs = MAX_IDE_DEVS;
191
        } else if (!strcmp(buf, "scsi")) {
192
            type = IF_SCSI;
193
            max_devs = MAX_SCSI_DEVS;
194
        } else if (!strcmp(buf, "floppy")) {
195
            type = IF_FLOPPY;
196
            max_devs = 0;
197
        } else if (!strcmp(buf, "pflash")) {
198
            type = IF_PFLASH;
199
            max_devs = 0;
200
        } else if (!strcmp(buf, "mtd")) {
201
            type = IF_MTD;
202
            max_devs = 0;
203
        } else if (!strcmp(buf, "sd")) {
204
            type = IF_SD;
205
            max_devs = 0;
206
        } else if (!strcmp(buf, "virtio")) {
207
            type = IF_VIRTIO;
208
            max_devs = 0;
209
        } else if (!strcmp(buf, "xen")) {
210
            type = IF_XEN;
211
            max_devs = 0;
212
        } else if (!strcmp(buf, "none")) {
213
            type = IF_NONE;
214
            max_devs = 0;
215
        } else {
216
            fprintf(stderr, "qemu: unsupported bus type '%s'\n", buf);
217
            return NULL;
218
        }
219
    }
220

    
221
    if (cyls || heads || secs) {
222
        if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
223
            fprintf(stderr, "qemu: '%s' invalid physical cyls number\n", buf);
224
            return NULL;
225
        }
226
        if (heads < 1 || (type == IF_IDE && heads > 16)) {
227
            fprintf(stderr, "qemu: '%s' invalid physical heads number\n", buf);
228
            return NULL;
229
        }
230
        if (secs < 1 || (type == IF_IDE && secs > 63)) {
231
            fprintf(stderr, "qemu: '%s' invalid physical secs number\n", buf);
232
            return NULL;
233
        }
234
    }
235

    
236
    if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
237
        if (!cyls) {
238
            fprintf(stderr,
239
                    "qemu: '%s' trans must be used with cyls,heads and secs\n",
240
                    buf);
241
            return NULL;
242
        }
243
        if (!strcmp(buf, "none"))
244
            translation = BIOS_ATA_TRANSLATION_NONE;
245
        else if (!strcmp(buf, "lba"))
246
            translation = BIOS_ATA_TRANSLATION_LBA;
247
        else if (!strcmp(buf, "auto"))
248
            translation = BIOS_ATA_TRANSLATION_AUTO;
249
        else {
250
            fprintf(stderr, "qemu: '%s' invalid translation type\n", buf);
251
            return NULL;
252
        }
253
    }
254

    
255
    if ((buf = qemu_opt_get(opts, "media")) != NULL) {
256
        if (!strcmp(buf, "disk")) {
257
            media = MEDIA_DISK;
258
        } else if (!strcmp(buf, "cdrom")) {
259
            if (cyls || secs || heads) {
260
                fprintf(stderr,
261
                        "qemu: '%s' invalid physical CHS format\n", buf);
262
                return NULL;
263
            }
264
            media = MEDIA_CDROM;
265
        } else {
266
            fprintf(stderr, "qemu: '%s' invalid media\n", buf);
267
            return NULL;
268
        }
269
    }
270

    
271
    if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
272
        if (!strcmp(buf, "off") || !strcmp(buf, "none")) {
273
            bdrv_flags |= BDRV_O_NOCACHE;
274
        } else if (!strcmp(buf, "writeback")) {
275
            bdrv_flags |= BDRV_O_CACHE_WB;
276
        } else if (!strcmp(buf, "unsafe")) {
277
            bdrv_flags |= BDRV_O_CACHE_WB;
278
            bdrv_flags |= BDRV_O_NO_FLUSH;
279
        } else if (!strcmp(buf, "writethrough")) {
280
            /* this is the default */
281
        } else {
282
           fprintf(stderr, "qemu: invalid cache option\n");
283
           return NULL;
284
        }
285
    }
286

    
287
#ifdef CONFIG_LINUX_AIO
288
    if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
289
        if (!strcmp(buf, "native")) {
290
            bdrv_flags |= BDRV_O_NATIVE_AIO;
291
        } else if (!strcmp(buf, "threads")) {
292
            /* this is the default */
293
        } else {
294
           fprintf(stderr, "qemu: invalid aio option\n");
295
           return NULL;
296
        }
297
    }
298
#endif
299

    
300
    if ((buf = qemu_opt_get(opts, "format")) != NULL) {
301
       if (strcmp(buf, "?") == 0) {
302
            fprintf(stderr, "qemu: Supported formats:");
303
            bdrv_iterate_format(bdrv_format_print, NULL);
304
            fprintf(stderr, "\n");
305
            return NULL;
306
        }
307
        drv = bdrv_find_whitelisted_format(buf);
308
        if (!drv) {
309
            fprintf(stderr, "qemu: '%s' invalid format\n", buf);
310
            return NULL;
311
        }
312
    }
313

    
314
    on_write_error = BLOCK_ERR_STOP_ENOSPC;
315
    if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
316
        if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
317
            fprintf(stderr, "werror is no supported by this format\n");
318
            return NULL;
319
        }
320

    
321
        on_write_error = parse_block_error_action(buf, 0);
322
        if (on_write_error < 0) {
323
            return NULL;
324
        }
325
    }
326

    
327
    on_read_error = BLOCK_ERR_REPORT;
328
    if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
329
        if (type != IF_IDE && type != IF_VIRTIO && type != IF_NONE) {
330
            fprintf(stderr, "rerror is no supported by this format\n");
331
            return NULL;
332
        }
333

    
334
        on_read_error = parse_block_error_action(buf, 1);
335
        if (on_read_error < 0) {
336
            return NULL;
337
        }
338
    }
339

    
340
    if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
341
        if (type != IF_VIRTIO) {
342
            fprintf(stderr, "addr is not supported\n");
343
            return NULL;
344
        }
345
    }
346

    
347
    /* compute bus and unit according index */
348

    
349
    if (index != -1) {
350
        if (bus_id != 0 || unit_id != -1) {
351
            fprintf(stderr,
352
                    "qemu: index cannot be used with bus and unit\n");
353
            return NULL;
354
        }
355
        if (max_devs == 0)
356
        {
357
            unit_id = index;
358
            bus_id = 0;
359
        } else {
360
            unit_id = index % max_devs;
361
            bus_id = index / max_devs;
362
        }
363
    }
364

    
365
    /* if user doesn't specify a unit_id,
366
     * try to find the first free
367
     */
368

    
369
    if (unit_id == -1) {
370
       unit_id = 0;
371
       while (drive_get(type, bus_id, unit_id) != NULL) {
372
           unit_id++;
373
           if (max_devs && unit_id >= max_devs) {
374
               unit_id -= max_devs;
375
               bus_id++;
376
           }
377
       }
378
    }
379

    
380
    /* check unit id */
381

    
382
    if (max_devs && unit_id >= max_devs) {
383
        fprintf(stderr, "qemu: unit %d too big (max is %d)\n",
384
                unit_id, max_devs - 1);
385
        return NULL;
386
    }
387

    
388
    /*
389
     * ignore multiple definitions
390
     */
391

    
392
    if (drive_get(type, bus_id, unit_id) != NULL) {
393
        *fatal_error = 0;
394
        return NULL;
395
    }
396

    
397
    /* init */
398

    
399
    dinfo = qemu_mallocz(sizeof(*dinfo));
400
    if ((buf = qemu_opts_id(opts)) != NULL) {
401
        dinfo->id = qemu_strdup(buf);
402
    } else {
403
        /* no id supplied -> create one */
404
        dinfo->id = qemu_mallocz(32);
405
        if (type == IF_IDE || type == IF_SCSI)
406
            mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
407
        if (max_devs)
408
            snprintf(dinfo->id, 32, "%s%i%s%i",
409
                     devname, bus_id, mediastr, unit_id);
410
        else
411
            snprintf(dinfo->id, 32, "%s%s%i",
412
                     devname, mediastr, unit_id);
413
    }
414
    dinfo->bdrv = bdrv_new(dinfo->id);
415
    dinfo->devaddr = devaddr;
416
    dinfo->type = type;
417
    dinfo->bus = bus_id;
418
    dinfo->unit = unit_id;
419
    dinfo->opts = opts;
420
    if (serial)
421
        strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
422
    QTAILQ_INSERT_TAIL(&drives, dinfo, next);
423

    
424
    bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
425

    
426
    switch(type) {
427
    case IF_IDE:
428
    case IF_SCSI:
429
    case IF_XEN:
430
    case IF_NONE:
431
        switch(media) {
432
        case MEDIA_DISK:
433
            if (cyls != 0) {
434
                bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
435
                bdrv_set_translation_hint(dinfo->bdrv, translation);
436
            }
437
            break;
438
        case MEDIA_CDROM:
439
            bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
440
            break;
441
        }
442
        break;
443
    case IF_SD:
444
        /* FIXME: This isn't really a floppy, but it's a reasonable
445
           approximation.  */
446
    case IF_FLOPPY:
447
        bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
448
        break;
449
    case IF_PFLASH:
450
    case IF_MTD:
451
        break;
452
    case IF_VIRTIO:
453
        /* add virtio block device */
454
        opts = qemu_opts_create(&qemu_device_opts, NULL, 0);
455
        qemu_opt_set(opts, "driver", "virtio-blk-pci");
456
        qemu_opt_set(opts, "drive", dinfo->id);
457
        if (devaddr)
458
            qemu_opt_set(opts, "addr", devaddr);
459
        break;
460
    case IF_COUNT:
461
        abort();
462
    }
463
    if (!file || !*file) {
464
        *fatal_error = 0;
465
        return NULL;
466
    }
467
    if (snapshot) {
468
        /* always use cache=unsafe with snapshot */
469
        bdrv_flags &= ~BDRV_O_CACHE_MASK;
470
        bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
471
    }
472

    
473
    if (media == MEDIA_CDROM) {
474
        /* CDROM is fine for any interface, don't check.  */
475
        ro = 1;
476
    } else if (ro == 1) {
477
        if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
478
            fprintf(stderr, "qemu: readonly flag not supported for drive with this interface\n");
479
            return NULL;
480
        }
481
    }
482

    
483
    bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
484

    
485
    ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
486
    if (ret < 0) {
487
        fprintf(stderr, "qemu: could not open disk image %s: %s\n",
488
                        file, strerror(-ret));
489
        return NULL;
490
    }
491

    
492
    if (bdrv_key_required(dinfo->bdrv))
493
        autostart = 0;
494
    *fatal_error = 0;
495
    return dinfo;
496
}
497

    
498
void do_commit(Monitor *mon, const QDict *qdict)
499
{
500
    const char *device = qdict_get_str(qdict, "device");
501
    BlockDriverState *bs;
502

    
503
    if (!strcmp(device, "all")) {
504
        bdrv_commit_all();
505
    } else {
506
        bs = bdrv_find(device);
507
        if (!bs) {
508
            qerror_report(QERR_DEVICE_NOT_FOUND, device);
509
            return;
510
        }
511
        bdrv_commit(bs);
512
    }
513
}
514

    
515
static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
516
{
517
    if (!force) {
518
        if (!bdrv_is_removable(bs)) {
519
            qerror_report(QERR_DEVICE_NOT_REMOVABLE,
520
                           bdrv_get_device_name(bs));
521
            return -1;
522
        }
523
        if (bdrv_is_locked(bs)) {
524
            qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
525
            return -1;
526
        }
527
    }
528
    bdrv_close(bs);
529
    return 0;
530
}
531

    
532
int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
533
{
534
    BlockDriverState *bs;
535
    int force = qdict_get_try_bool(qdict, "force", 0);
536
    const char *filename = qdict_get_str(qdict, "device");
537

    
538
    bs = bdrv_find(filename);
539
    if (!bs) {
540
        qerror_report(QERR_DEVICE_NOT_FOUND, filename);
541
        return -1;
542
    }
543
    return eject_device(mon, bs, force);
544
}
545

    
546
int do_block_set_passwd(Monitor *mon, const QDict *qdict,
547
                        QObject **ret_data)
548
{
549
    BlockDriverState *bs;
550
    int err;
551

    
552
    bs = bdrv_find(qdict_get_str(qdict, "device"));
553
    if (!bs) {
554
        qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
555
        return -1;
556
    }
557

    
558
    err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
559
    if (err == -EINVAL) {
560
        qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
561
        return -1;
562
    } else if (err < 0) {
563
        qerror_report(QERR_INVALID_PASSWORD);
564
        return -1;
565
    }
566

    
567
    return 0;
568
}
569

    
570
int do_change_block(Monitor *mon, const char *device,
571
                    const char *filename, const char *fmt)
572
{
573
    BlockDriverState *bs;
574
    BlockDriver *drv = NULL;
575
    int bdrv_flags;
576

    
577
    bs = bdrv_find(device);
578
    if (!bs) {
579
        qerror_report(QERR_DEVICE_NOT_FOUND, device);
580
        return -1;
581
    }
582
    if (fmt) {
583
        drv = bdrv_find_whitelisted_format(fmt);
584
        if (!drv) {
585
            qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
586
            return -1;
587
        }
588
    }
589
    if (eject_device(mon, bs, 0) < 0) {
590
        return -1;
591
    }
592
    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
593
    if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
594
        qerror_report(QERR_OPEN_FILE_FAILED, filename);
595
        return -1;
596
    }
597
    return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
598
}