Blame view

block.c 39.8 KB
bellard authored
1
2
/*
 * QEMU System Emulator block driver
3
 *
bellard authored
4
 * Copyright (c) 2003 Fabrice Bellard
5
 *
bellard authored
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 * 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.
 */
24
25
26
27
28
29
#include "config-host.h"
#ifdef _BSD
/* include native header before sys-queue.h */
#include <sys/queue.h>
#endif
pbrook authored
30
#include "qemu-common.h"
pbrook authored
31
#include "console.h"
bellard authored
32
#include "block_int.h"
bellard authored
33
bellard authored
34
35
36
37
38
39
40
#ifdef _BSD
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/disk.h>
#endif
bellard authored
41
42
43
#define SECTOR_BITS 9
#define SECTOR_SIZE (1 << SECTOR_BITS)
bellard authored
44
45
46
47
48
49
typedef struct BlockDriverAIOCBSync {
    BlockDriverAIOCB common;
    QEMUBH *bh;
    int ret;
} BlockDriverAIOCBSync;
50
51
52
53
54
55
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
        int64_t sector_num, uint8_t *buf, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
        int64_t sector_num, const uint8_t *buf, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);
bellard authored
56
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
57
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
bellard authored
58
59
60
                        uint8_t *buf, int nb_sectors);
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                         const uint8_t *buf, int nb_sectors);
bellard authored
61
62
63
BlockDriverState *bdrv_first;
bellard authored
64
65
static BlockDriver *first_drv;
bellard authored
66
int path_is_absolute(const char *path)
67
{
bellard authored
68
    const char *p;
69
70
71
72
73
#ifdef _WIN32
    /* specific case for names like: "\\.\d:" */
    if (*path == '/' || *path == '\\')
        return 1;
#endif
bellard authored
74
75
76
77
78
    p = strchr(path, ':');
    if (p)
        p++;
    else
        p = path;
79
80
81
82
83
#ifdef _WIN32
    return (*p == '/' || *p == '\\');
#else
    return (*p == '/');
#endif
84
85
}
bellard authored
86
87
88
89
90
91
/* if filename is absolute, just copy it to dest. Otherwise, build a
   path to it by considering it is relative to base_path. URL are
   supported. */
void path_combine(char *dest, int dest_size,
                  const char *base_path,
                  const char *filename)
92
{
bellard authored
93
94
95
96
97
98
99
100
101
102
103
104
105
    const char *p, *p1;
    int len;

    if (dest_size <= 0)
        return;
    if (path_is_absolute(filename)) {
        pstrcpy(dest, dest_size, filename);
    } else {
        p = strchr(base_path, ':');
        if (p)
            p++;
        else
            p = base_path;
106
107
108
109
110
111
112
113
114
        p1 = strrchr(base_path, '/');
#ifdef _WIN32
        {
            const char *p2;
            p2 = strrchr(base_path, '\\');
            if (!p1 || p2 > p1)
                p1 = p2;
        }
#endif
bellard authored
115
116
117
118
119
120
121
122
123
124
125
126
        if (p1)
            p1++;
        else
            p1 = base_path;
        if (p1 > p)
            p = p1;
        len = p - base_path;
        if (len > dest_size - 1)
            len = dest_size - 1;
        memcpy(dest, base_path, len);
        dest[len] = '\0';
        pstrcat(dest, dest_size, filename);
127
128
129
130
    }
}
131
static void bdrv_register(BlockDriver *bdrv)
bellard authored
132
{
133
    if (!bdrv->bdrv_aio_read) {
bellard authored
134
135
136
137
        /* add AIO emulation layer */
        bdrv->bdrv_aio_read = bdrv_aio_read_em;
        bdrv->bdrv_aio_write = bdrv_aio_write_em;
        bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
bellard authored
138
        bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
bellard authored
139
140
141
142
143
    } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
        /* add synchronous IO emulation layer */
        bdrv->bdrv_read = bdrv_read_em;
        bdrv->bdrv_write = bdrv_write_em;
    }
bellard authored
144
145
146
    bdrv->next = first_drv;
    first_drv = bdrv;
}
bellard authored
147
148
149
150
151
152
153
154
155
156

/* create a new block device (by default it is empty) */
BlockDriverState *bdrv_new(const char *device_name)
{
    BlockDriverState **pbs, *bs;

    bs = qemu_mallocz(sizeof(BlockDriverState));
    if(!bs)
        return NULL;
    pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
bellard authored
157
158
159
160
161
162
163
    if (device_name[0] != '\0') {
        /* insert at the end */
        pbs = &bdrv_first;
        while (*pbs != NULL)
            pbs = &(*pbs)->next;
        *pbs = bs;
    }
bellard authored
164
165
166
    return bs;
}
bellard authored
167
168
169
170
171
172
173
174
175
176
BlockDriver *bdrv_find_format(const char *format_name)
{
    BlockDriver *drv1;
    for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
        if (!strcmp(drv1->format_name, format_name))
            return drv1;
    }
    return NULL;
}
177
int bdrv_create(BlockDriver *drv,
bellard authored
178
179
180
181
182
183
184
185
                const char *filename, int64_t size_in_sectors,
                const char *backing_file, int flags)
{
    if (!drv->bdrv_create)
        return -ENOTSUP;
    return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
}
bellard authored
186
#ifdef _WIN32
187
void get_tmp_filename(char *filename, int size)
bellard authored
188
{
189
    char temp_dir[MAX_PATH];
190
191
192
    GetTempPath(MAX_PATH, temp_dir);
    GetTempFileName(temp_dir, "qem", 0, filename);
bellard authored
193
194
}
#else
195
void get_tmp_filename(char *filename, int size)
bellard authored
196
{
197
    int fd;
198
    const char *tmpdir;
bellard authored
199
    /* XXX: race condition possible */
200
201
202
203
    tmpdir = getenv("TMPDIR");
    if (!tmpdir)
        tmpdir = "/tmp";
    snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
bellard authored
204
205
206
    fd = mkstemp(filename);
    close(fd);
}
bellard authored
207
#endif
bellard authored
208
209
#ifdef _WIN32
bellard authored
210
211
212
213
214
215
static int is_windows_drive_prefix(const char *filename)
{
    return (((filename[0] >= 'a' && filename[0] <= 'z') ||
             (filename[0] >= 'A' && filename[0] <= 'Z')) &&
            filename[1] == ':');
}
216
217
218
static int is_windows_drive(const char *filename)
{
219
    if (is_windows_drive_prefix(filename) &&
bellard authored
220
        filename[2] == '\0')
221
222
223
224
225
226
227
228
        return 1;
    if (strstart(filename, "\\\\.\\", NULL) ||
        strstart(filename, "//./", NULL))
        return 1;
    return 0;
}
#endif
bellard authored
229
230
231
232
233
234
static BlockDriver *find_protocol(const char *filename)
{
    BlockDriver *drv1;
    char protocol[128];
    int len;
    const char *p;
235
236

#ifdef _WIN32
bellard authored
237
238
    if (is_windows_drive(filename) ||
        is_windows_drive_prefix(filename))
239
240
        return &bdrv_raw;
#endif
bellard authored
241
242
243
244
245
246
247
248
249
    p = strchr(filename, ':');
    if (!p)
        return &bdrv_raw;
    len = p - filename;
    if (len > sizeof(protocol) - 1)
        len = sizeof(protocol) - 1;
    memcpy(protocol, filename, len);
    protocol[len] = '\0';
    for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
250
        if (drv1->protocol_name &&
bellard authored
251
252
253
254
255
256
            !strcmp(drv1->protocol_name, protocol))
            return drv1;
    }
    return NULL;
}
bellard authored
257
258
/* XXX: force raw format if block or character device ? It would
   simplify the BSD case */
bellard authored
259
260
static BlockDriver *find_image_format(const char *filename)
{
bellard authored
261
    int ret, score, score_max;
bellard authored
262
    BlockDriver *drv1, *drv;
bellard authored
263
264
    uint8_t buf[2048];
    BlockDriverState *bs;
265
266
267
268
269
270
271
272
273
274
275
    /* detect host devices. By convention, /dev/cdrom[N] is always
       recognized as a host CDROM */
    if (strstart(filename, "/dev/cdrom", NULL))
        return &bdrv_host_device;
#ifdef _WIN32
    if (is_windows_drive(filename))
        return &bdrv_host_device;
#else
    {
        struct stat st;
276
        if (stat(filename, &st) >= 0 &&
277
278
279
280
281
            (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
            return &bdrv_host_device;
        }
    }
#endif
282
bellard authored
283
    drv = find_protocol(filename);
284
    /* no need to test disk image formats for vvfat */
bellard authored
285
286
    if (drv == &bdrv_vvfat)
        return drv;
287
bellard authored
288
289
290
291
292
293
294
295
296
    ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
    if (ret < 0)
        return NULL;
    ret = bdrv_pread(bs, 0, buf, sizeof(buf));
    bdrv_delete(bs);
    if (ret < 0) {
        return NULL;
    }
bellard authored
297
298
    score_max = 0;
    for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
bellard authored
299
300
301
302
303
304
        if (drv1->bdrv_probe) {
            score = drv1->bdrv_probe(buf, ret, filename);
            if (score > score_max) {
                score_max = score;
                drv = drv1;
            }
bellard authored
305
        }
bellard authored
306
    }
bellard authored
307
308
309
    return drv;
}
bellard authored
310
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
bellard authored
311
{
bellard authored
312
313
314
315
316
317
318
319
320
321
    BlockDriverState *bs;
    int ret;

    bs = bdrv_new("");
    if (!bs)
        return -ENOMEM;
    ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
    if (ret < 0) {
        bdrv_delete(bs);
        return ret;
322
    }
bellard authored
323
324
325
326
327
328
329
    *pbs = bs;
    return 0;
}

int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
{
    return bdrv_open2(bs, filename, flags, NULL);
bellard authored
330
331
}
bellard authored
332
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
bellard authored
333
334
               BlockDriver *drv)
{
bellard authored
335
    int ret, open_flags;
336
337
    char tmp_filename[PATH_MAX];
    char backing_filename[PATH_MAX];
338
bellard authored
339
340
341
    bs->read_only = 0;
    bs->is_temporary = 0;
    bs->encrypted = 0;
bellard authored
342
bellard authored
343
    if (flags & BDRV_O_SNAPSHOT) {
bellard authored
344
345
        BlockDriverState *bs1;
        int64_t total_size;
346
        int is_protocol = 0;
347
bellard authored
348
349
        /* if snapshot, we create a temporary backing file and open it
           instead of opening 'filename' directly */
350
bellard authored
351
352
353
        /* if there is a backing file, use it */
        bs1 = bdrv_new("");
        if (!bs1) {
bellard authored
354
            return -ENOMEM;
bellard authored
355
356
357
358
359
        }
        if (bdrv_open(bs1, filename, 0) < 0) {
            bdrv_delete(bs1);
            return -1;
        }
bellard authored
360
        total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
361
362
363
364

        if (bs1->drv && bs1->drv->protocol_name)
            is_protocol = 1;
bellard authored
365
        bdrv_delete(bs1);
366
bellard authored
367
        get_tmp_filename(tmp_filename, sizeof(tmp_filename));
368
369
370
371
372
373
374
375

        /* Real path is meaningless for protocols */
        if (is_protocol)
            snprintf(backing_filename, sizeof(backing_filename),
                     "%s", filename);
        else
            realpath(filename, backing_filename);
376
        if (bdrv_create(&bdrv_qcow2, tmp_filename,
377
                        total_size, backing_filename, 0) < 0) {
bellard authored
378
379
380
381
382
            return -1;
        }
        filename = tmp_filename;
        bs->is_temporary = 1;
    }
bellard authored
383
bellard authored
384
    pstrcpy(bs->filename, sizeof(bs->filename), filename);
bellard authored
385
386
    if (flags & BDRV_O_FILE) {
        drv = find_protocol(filename);
bellard authored
387
        if (!drv)
bellard authored
388
389
390
391
392
393
394
            return -ENOENT;
    } else {
        if (!drv) {
            drv = find_image_format(filename);
            if (!drv)
                return -1;
        }
bellard authored
395
396
397
398
399
    }
    bs->drv = drv;
    bs->opaque = qemu_mallocz(drv->instance_size);
    if (bs->opaque == NULL && drv->instance_size > 0)
        return -1;
bellard authored
400
401
402
    /* Note: for compatibility, we open disk image files as RDWR, and
       RDONLY as fallback */
    if (!(flags & BDRV_O_FILE))
403
        open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK);
bellard authored
404
405
406
    else
        open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
    ret = drv->bdrv_open(bs, filename, open_flags);
407
    if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
408
        ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
bellard authored
409
410
        bs->read_only = 1;
    }
bellard authored
411
412
    if (ret < 0) {
        qemu_free(bs->opaque);
bellard authored
413
414
        bs->opaque = NULL;
        bs->drv = NULL;
bellard authored
415
        return ret;
416
    }
417
418
419
    if (drv->bdrv_getlength) {
        bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
    }
420
#ifndef _WIN32
bellard authored
421
422
423
424
    if (bs->is_temporary) {
        unlink(filename);
    }
#endif
bellard authored
425
    if (bs->backing_file[0] != '\0') {
bellard authored
426
427
428
429
430
        /* if there is a backing file, use it */
        bs->backing_hd = bdrv_new("");
        if (!bs->backing_hd) {
        fail:
            bdrv_close(bs);
bellard authored
431
            return -ENOMEM;
432
        }
bellard authored
433
434
        path_combine(backing_filename, sizeof(backing_filename),
                     filename, bs->backing_file);
435
        if (bdrv_open(bs->backing_hd, backing_filename, open_flags) < 0)
436
437
438
            goto fail;
    }
bellard authored
439
    /* call the change callback */
440
    bs->media_changed = 1;
bellard authored
441
442
443
444
    if (bs->change_cb)
        bs->change_cb(bs->change_opaque);

    return 0;
bellard authored
445
446
447
448
}

void bdrv_close(BlockDriverState *bs)
{
449
    if (bs->drv) {
bellard authored
450
451
452
453
454
455
456
457
        if (bs->backing_hd)
            bdrv_delete(bs->backing_hd);
        bs->drv->bdrv_close(bs);
        qemu_free(bs->opaque);
#ifdef _WIN32
        if (bs->is_temporary) {
            unlink(bs->filename);
        }
458
#endif
bellard authored
459
460
        bs->opaque = NULL;
        bs->drv = NULL;
bellard authored
461
462

        /* call the change callback */
463
        bs->media_changed = 1;
bellard authored
464
465
466
467
468
469
470
        if (bs->change_cb)
            bs->change_cb(bs->change_opaque);
    }
}

void bdrv_delete(BlockDriverState *bs)
{
471
472
473
474
475
476
477
478
    BlockDriverState **pbs;

    pbs = &bdrv_first;
    while (*pbs != bs && *pbs != NULL)
        pbs = &(*pbs)->next;
    if (*pbs == bs)
        *pbs = bs->next;
bellard authored
479
480
    bdrv_close(bs);
    qemu_free(bs);
bellard authored
481
482
}
483
484
485
/* commit COW file into the raw image */
int bdrv_commit(BlockDriverState *bs)
{
486
    BlockDriver *drv = bs->drv;
bellard authored
487
    int64_t i, total_sectors;
bellard authored
488
489
    int n, j;
    unsigned char sector[512];
490
491
492
    if (!drv)
        return -ENOMEDIUM;
493
494

    if (bs->read_only) {
bellard authored
495
	return -EACCES;
496
497
    }
bellard authored
498
499
500
    if (!bs->backing_hd) {
	return -ENOTSUP;
    }
501
bellard authored
502
503
    total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
    for (i = 0; i < total_sectors;) {
504
        if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
bellard authored
505
506
507
508
509
510
511
512
513
            for(j = 0; j < n; j++) {
                if (bdrv_read(bs, i, sector, 1) != 0) {
                    return -EIO;
                }

                if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
                    return -EIO;
                }
                i++;
514
	    }
bellard authored
515
516
517
	} else {
            i += n;
        }
518
    }
519
520
521
    if (drv->bdrv_make_empty)
	return drv->bdrv_make_empty(bs);
522
523
524
525
    return 0;
}
526
/* return < 0 if error. See bdrv_write() for the return codes */
527
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
bellard authored
528
529
              uint8_t *buf, int nb_sectors)
{
bellard authored
530
531
    BlockDriver *drv = bs->drv;
532
533
    if (!drv)
        return -ENOMEDIUM;
bellard authored
534
bellard authored
535
536
537
538
539
540
541
    if (drv->bdrv_pread) {
        int ret, len;
        len = nb_sectors * 512;
        ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
        if (ret < 0)
            return ret;
        else if (ret != len)
542
            return -EINVAL;
543
544
545
        else {
	    bs->rd_bytes += (unsigned) len;
	    bs->rd_ops ++;
bellard authored
546
            return 0;
547
	}
bellard authored
548
549
    } else {
        return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
550
    }
bellard authored
551
552
}
553
/* Return < 0 if error. Important errors are:
554
555
556
557
558
  -EIO         generic I/O error (may happen for all errors)
  -ENOMEDIUM   No media inserted.
  -EINVAL      Invalid sector number or nb_sectors
  -EACCES      Trying to write a read-only device
*/
559
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
bellard authored
560
561
               const uint8_t *buf, int nb_sectors)
{
bellard authored
562
    BlockDriver *drv = bs->drv;
563
564
    if (!bs->drv)
        return -ENOMEDIUM;
bellard authored
565
    if (bs->read_only)
566
        return -EACCES;
bellard authored
567
    if (drv->bdrv_pwrite) {
568
        int ret, len, count = 0;
bellard authored
569
        len = nb_sectors * 512;
570
571
572
573
574
575
576
577
578
579
580
581
        do {
            ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len - count);
            if (ret < 0) {
                printf("bdrv_write ret=%d\n", ret);
                return ret;
            }
            count += ret;
            buf += ret;
        } while (count != len);
        bs->wr_bytes += (unsigned) len;
        bs->wr_ops ++;
        return 0;
bellard authored
582
    }
583
    return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
bellard authored
584
585
}
586
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
bellard authored
587
                         uint8_t *buf, int count1)
bellard authored
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
{
    uint8_t tmp_buf[SECTOR_SIZE];
    int len, nb_sectors, count;
    int64_t sector_num;

    count = count1;
    /* first read to align to sector start */
    len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
    if (len > count)
        len = count;
    sector_num = offset >> SECTOR_BITS;
    if (len > 0) {
        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
        memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
        count -= len;
        if (count == 0)
            return count1;
        sector_num++;
        buf += len;
    }

    /* read the sectors "in place" */
    nb_sectors = count >> SECTOR_BITS;
    if (nb_sectors > 0) {
        if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
            return -EIO;
        sector_num += nb_sectors;
        len = nb_sectors << SECTOR_BITS;
        buf += len;
        count -= len;
    }

    /* add data from the last sector */
    if (count > 0) {
        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
        memcpy(buf, tmp_buf, count);
    }
    return count1;
}
630
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
bellard authored
631
                          const uint8_t *buf, int count1)
bellard authored
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
{
    uint8_t tmp_buf[SECTOR_SIZE];
    int len, nb_sectors, count;
    int64_t sector_num;

    count = count1;
    /* first write to align to sector start */
    len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
    if (len > count)
        len = count;
    sector_num = offset >> SECTOR_BITS;
    if (len > 0) {
        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
        memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
        if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
        count -= len;
        if (count == 0)
            return count1;
        sector_num++;
        buf += len;
    }

    /* write the sectors "in place" */
    nb_sectors = count >> SECTOR_BITS;
    if (nb_sectors > 0) {
        if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
            return -EIO;
        sector_num += nb_sectors;
        len = nb_sectors << SECTOR_BITS;
        buf += len;
        count -= len;
    }

    /* add data from the last sector */
    if (count > 0) {
        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
        memcpy(tmp_buf, buf, count);
        if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
    }
    return count1;
}

/**
679
 * Read with byte offsets (needed only for file protocols)
bellard authored
680
 */
681
int bdrv_pread(BlockDriverState *bs, int64_t offset,
bellard authored
682
683
684
685
686
               void *buf1, int count1)
{
    BlockDriver *drv = bs->drv;

    if (!drv)
687
        return -ENOMEDIUM;
bellard authored
688
    if (!drv->bdrv_pread)
bellard authored
689
        return bdrv_pread_em(bs, offset, buf1, count1);
bellard authored
690
691
692
    return drv->bdrv_pread(bs, offset, buf1, count1);
}
693
694
/**
 * Write with byte offsets (needed only for file protocols)
bellard authored
695
 */
696
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
bellard authored
697
698
699
700
701
                const void *buf1, int count1)
{
    BlockDriver *drv = bs->drv;

    if (!drv)
702
        return -ENOMEDIUM;
bellard authored
703
    if (!drv->bdrv_pwrite)
bellard authored
704
        return bdrv_pwrite_em(bs, offset, buf1, count1);
bellard authored
705
706
707
708
709
710
711
712
713
714
    return drv->bdrv_pwrite(bs, offset, buf1, count1);
}

/**
 * Truncate file to 'offset' bytes (needed only for file protocols)
 */
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
715
        return -ENOMEDIUM;
bellard authored
716
717
718
719
720
721
722
723
724
725
726
727
    if (!drv->bdrv_truncate)
        return -ENOTSUP;
    return drv->bdrv_truncate(bs, offset);
}

/**
 * Length of a file in bytes. Return < 0 if error or unknown.
 */
int64_t bdrv_getlength(BlockDriverState *bs)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
728
        return -ENOMEDIUM;
bellard authored
729
730
731
732
733
    if (!drv->bdrv_getlength) {
        /* legacy mode */
        return bs->total_sectors * SECTOR_SIZE;
    }
    return drv->bdrv_getlength(bs);
bellard authored
734
735
}
736
/* return 0 as number of sectors if no device present or error */
737
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
bellard authored
738
{
739
740
741
742
743
744
745
    int64_t length;
    length = bdrv_getlength(bs);
    if (length < 0)
        length = 0;
    else
        length = length >> SECTOR_BITS;
    *nb_sectors_ptr = length;
bellard authored
746
}
bellard authored
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
struct partition {
        uint8_t boot_ind;           /* 0x80 - active */
        uint8_t head;               /* starting head */
        uint8_t sector;             /* starting sector */
        uint8_t cyl;                /* starting cylinder */
        uint8_t sys_ind;            /* What partition type */
        uint8_t end_head;           /* end head */
        uint8_t end_sector;         /* end sector */
        uint8_t end_cyl;            /* end cylinder */
        uint32_t start_sect;        /* starting sector counting from 0 */
        uint32_t nr_sects;          /* nr of sectors in partition */
} __attribute__((packed));

/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
static int guess_disk_lchs(BlockDriverState *bs,
                           int *pcylinders, int *pheads, int *psectors)
{
    uint8_t buf[512];
    int ret, i, heads, sectors, cylinders;
    struct partition *p;
    uint32_t nr_sects;
769
    uint64_t nb_sectors;
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

    bdrv_get_geometry(bs, &nb_sectors);

    ret = bdrv_read(bs, 0, buf, 1);
    if (ret < 0)
        return -1;
    /* test msdos magic */
    if (buf[510] != 0x55 || buf[511] != 0xaa)
        return -1;
    for(i = 0; i < 4; i++) {
        p = ((struct partition *)(buf + 0x1be)) + i;
        nr_sects = le32_to_cpu(p->nr_sects);
        if (nr_sects && p->end_head) {
            /* We make the assumption that the partition terminates on
               a cylinder boundary */
            heads = p->end_head + 1;
            sectors = p->end_sector & 63;
            if (sectors == 0)
                continue;
            cylinders = nb_sectors / (heads * sectors);
            if (cylinders < 1 || cylinders > 16383)
                continue;
            *pheads = heads;
            *psectors = sectors;
            *pcylinders = cylinders;
#if 0
            printf("guessed geometry: LCHS=%d %d %d\n",
                   cylinders, heads, sectors);
#endif
            return 0;
        }
    }
    return -1;
}

void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
{
    int translation, lba_detected = 0;
    int cylinders, heads, secs;
809
    uint64_t nb_sectors;
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

    /* if a geometry hint is available, use it */
    bdrv_get_geometry(bs, &nb_sectors);
    bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
    translation = bdrv_get_translation_hint(bs);
    if (cylinders != 0) {
        *pcyls = cylinders;
        *pheads = heads;
        *psecs = secs;
    } else {
        if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
            if (heads > 16) {
                /* if heads > 16, it means that a BIOS LBA
                   translation was active, so the default
                   hardware geometry is OK */
                lba_detected = 1;
                goto default_geometry;
            } else {
                *pcyls = cylinders;
                *pheads = heads;
                *psecs = secs;
                /* disable any translation to be in sync with
                   the logical geometry */
                if (translation == BIOS_ATA_TRANSLATION_AUTO) {
                    bdrv_set_translation_hint(bs,
                                              BIOS_ATA_TRANSLATION_NONE);
                }
            }
        } else {
        default_geometry:
            /* if no geometry, use a standard physical disk geometry */
            cylinders = nb_sectors / (16 * 63);

            if (cylinders > 16383)
                cylinders = 16383;
            else if (cylinders < 2)
                cylinders = 2;
            *pcyls = cylinders;
            *pheads = 16;
            *psecs = 63;
            if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
                if ((*pcyls * *pheads) <= 131072) {
                    bdrv_set_translation_hint(bs,
                                              BIOS_ATA_TRANSLATION_LARGE);
                } else {
                    bdrv_set_translation_hint(bs,
                                              BIOS_ATA_TRANSLATION_LBA);
                }
            }
        }
        bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
    }
}
864
void bdrv_set_geometry_hint(BlockDriverState *bs,
bellard authored
865
866
867
868
869
870
871
872
873
874
875
876
877
878
                            int cyls, int heads, int secs)
{
    bs->cyls = cyls;
    bs->heads = heads;
    bs->secs = secs;
}

void bdrv_set_type_hint(BlockDriverState *bs, int type)
{
    bs->type = type;
    bs->removable = ((type == BDRV_TYPE_CDROM ||
                      type == BDRV_TYPE_FLOPPY));
}
879
880
881
882
883
void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
{
    bs->translation = translation;
}
884
void bdrv_get_geometry_hint(BlockDriverState *bs,
bellard authored
885
886
887
888
889
890
891
892
893
894
895
896
                            int *pcyls, int *pheads, int *psecs)
{
    *pcyls = bs->cyls;
    *pheads = bs->heads;
    *psecs = bs->secs;
}

int bdrv_get_type_hint(BlockDriverState *bs)
{
    return bs->type;
}
897
898
899
900
901
int bdrv_get_translation_hint(BlockDriverState *bs)
{
    return bs->translation;
}
bellard authored
902
903
904
905
906
907
908
909
910
911
int bdrv_is_removable(BlockDriverState *bs)
{
    return bs->removable;
}

int bdrv_is_read_only(BlockDriverState *bs)
{
    return bs->read_only;
}
912
913
914
915
916
int bdrv_is_sg(BlockDriverState *bs)
{
    return bs->sg;
}
917
/* XXX: no longer used */
918
void bdrv_set_change_cb(BlockDriverState *bs,
bellard authored
919
920
921
922
923
924
                        void (*change_cb)(void *opaque), void *opaque)
{
    bs->change_cb = change_cb;
    bs->change_opaque = opaque;
}
bellard authored
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
int bdrv_is_encrypted(BlockDriverState *bs)
{
    if (bs->backing_hd && bs->backing_hd->encrypted)
        return 1;
    return bs->encrypted;
}

int bdrv_set_key(BlockDriverState *bs, const char *key)
{
    int ret;
    if (bs->backing_hd && bs->backing_hd->encrypted) {
        ret = bdrv_set_key(bs->backing_hd, key);
        if (ret < 0)
            return ret;
        if (!bs->encrypted)
            return 0;
    }
    if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
        return -1;
    return bs->drv->bdrv_set_key(bs, key);
}

void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
{
949
    if (!bs->drv) {
bellard authored
950
951
952
953
954
955
        buf[0] = '\0';
    } else {
        pstrcpy(buf, buf_size, bs->drv->format_name);
    }
}
956
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
bellard authored
957
958
959
960
961
962
963
964
965
                         void *opaque)
{
    BlockDriver *drv;

    for (drv = first_drv; drv != NULL; drv = drv->next) {
        it(opaque, drv->format_name);
    }
}
bellard authored
966
967
968
969
970
971
972
973
974
975
976
BlockDriverState *bdrv_find(const char *name)
{
    BlockDriverState *bs;

    for (bs = bdrv_first; bs != NULL; bs = bs->next) {
        if (!strcmp(name, bs->device_name))
            return bs;
    }
    return NULL;
}
bellard authored
977
978
979
980
981
982
983
984
985
void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
{
    BlockDriverState *bs;

    for (bs = bdrv_first; bs != NULL; bs = bs->next) {
        it(opaque, bs->device_name);
    }
}
bellard authored
986
987
988
989
990
const char *bdrv_get_device_name(BlockDriverState *bs)
{
    return bs->device_name;
}
pbrook authored
991
992
993
994
995
996
997
998
void bdrv_flush(BlockDriverState *bs)
{
    if (bs->drv->bdrv_flush)
        bs->drv->bdrv_flush(bs);
    if (bs->backing_hd)
        bdrv_flush(bs->backing_hd);
}
aliguori authored
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
void bdrv_flush_all(void)
{
    BlockDriverState *bs;

    for (bs = bdrv_first; bs != NULL; bs = bs->next)
        if (bs->drv && !bdrv_is_read_only(bs) && 
            (!bdrv_is_removable(bs) || bdrv_is_inserted(bs)))
            bdrv_flush(bs);
}
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
/*
 * Returns true iff the specified sector is present in the disk image. Drivers
 * not implementing the functionality are assumed to not support backing files,
 * hence all their sectors are reported as allocated.
 *
 * 'pnum' is set to the number of sectors (including and immediately following
 * the specified sector) that are known to be in the same
 * allocated/unallocated state.
 *
 * 'nb_sectors' is the max value 'pnum' should be set to.
 */
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
	int *pnum)
{
    int64_t n;
    if (!bs->drv->bdrv_is_allocated) {
        if (sector_num >= bs->total_sectors) {
            *pnum = 0;
            return 0;
        }
        n = bs->total_sectors - sector_num;
        *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
        return 1;
    }
    return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
}
bellard authored
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
void bdrv_info(void)
{
    BlockDriverState *bs;

    for (bs = bdrv_first; bs != NULL; bs = bs->next) {
        term_printf("%s:", bs->device_name);
        term_printf(" type=");
        switch(bs->type) {
        case BDRV_TYPE_HD:
            term_printf("hd");
            break;
        case BDRV_TYPE_CDROM:
            term_printf("cdrom");
            break;
        case BDRV_TYPE_FLOPPY:
            term_printf("floppy");
            break;
        }
        term_printf(" removable=%d", bs->removable);
        if (bs->removable) {
            term_printf(" locked=%d", bs->locked);
        }
1058
        if (bs->drv) {
1059
1060
1061
1062
1063
1064
            term_printf(" file=");
	    term_print_filename(bs->filename);
            if (bs->backing_file[0] != '\0') {
                term_printf(" backing_file=");
		term_print_filename(bs->backing_file);
	    }
bellard authored
1065
            term_printf(" ro=%d", bs->read_only);
bellard authored
1066
1067
1068
            term_printf(" drv=%s", bs->drv->format_name);
            if (bs->encrypted)
                term_printf(" encrypted");
bellard authored
1069
1070
1071
1072
1073
1074
        } else {
            term_printf(" [not inserted]");
        }
        term_printf("\n");
    }
}
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092

/* The "info blockstats" command. */
void bdrv_info_stats (void)
{
    BlockDriverState *bs;

    for (bs = bdrv_first; bs != NULL; bs = bs->next) {
	term_printf ("%s:"
		     " rd_bytes=%" PRIu64
		     " wr_bytes=%" PRIu64
		     " rd_operations=%" PRIu64
		     " wr_operations=%" PRIu64
		     "\n",
		     bs->device_name,
		     bs->rd_bytes, bs->wr_bytes,
		     bs->rd_ops, bs->wr_ops);
    }
}
bellard authored
1093
1094
void bdrv_get_backing_filename(BlockDriverState *bs,
bellard authored
1095
1096
1097
1098
1099
1100
1101
1102
1103
                               char *filename, int filename_size)
{
    if (!bs->backing_hd) {
        pstrcpy(filename, filename_size, "");
    } else {
        pstrcpy(filename, filename_size, bs->backing_file);
    }
}
1104
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
bellard authored
1105
1106
1107
1108
                          const uint8_t *buf, int nb_sectors)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
1109
        return -ENOMEDIUM;
bellard authored
1110
1111
1112
1113
    if (!drv->bdrv_write_compressed)
        return -ENOTSUP;
    return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
}
1114
bellard authored
1115
1116
1117
1118
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
1119
        return -ENOMEDIUM;
bellard authored
1120
1121
1122
1123
1124
1125
1126
1127
1128
    if (!drv->bdrv_get_info)
        return -ENOTSUP;
    memset(bdi, 0, sizeof(*bdi));
    return drv->bdrv_get_info(bs, bdi);
}

/**************************************************************/
/* handling of snapshots */
1129
int bdrv_snapshot_create(BlockDriverState *bs,
bellard authored
1130
1131
1132
1133
                         QEMUSnapshotInfo *sn_info)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
1134
        return -ENOMEDIUM;
bellard authored
1135
1136
1137
1138
1139
    if (!drv->bdrv_snapshot_create)
        return -ENOTSUP;
    return drv->bdrv_snapshot_create(bs, sn_info);
}
1140
int bdrv_snapshot_goto(BlockDriverState *bs,
bellard authored
1141
1142
1143
1144
                       const char *snapshot_id)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
1145
        return -ENOMEDIUM;
bellard authored
1146
1147
1148
1149
1150
1151
1152
1153
1154
    if (!drv->bdrv_snapshot_goto)
        return -ENOTSUP;
    return drv->bdrv_snapshot_goto(bs, snapshot_id);
}

int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
1155
        return -ENOMEDIUM;
bellard authored
1156
1157
1158
1159
1160
    if (!drv->bdrv_snapshot_delete)
        return -ENOTSUP;
    return drv->bdrv_snapshot_delete(bs, snapshot_id);
}
1161
int bdrv_snapshot_list(BlockDriverState *bs,
bellard authored
1162
1163
1164
1165
                       QEMUSnapshotInfo **psn_info)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
1166
        return -ENOMEDIUM;
bellard authored
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
    if (!drv->bdrv_snapshot_list)
        return -ENOTSUP;
    return drv->bdrv_snapshot_list(bs, psn_info);
}

#define NB_SUFFIXES 4

char *get_human_readable_size(char *buf, int buf_size, int64_t size)
{
    static const char suffixes[NB_SUFFIXES] = "KMGT";
    int64_t base;
    int i;

    if (size <= 999) {
        snprintf(buf, buf_size, "%" PRId64, size);
    } else {
        base = 1024;
        for(i = 0; i < NB_SUFFIXES; i++) {
            if (size < (10 * base)) {
1186
                snprintf(buf, buf_size, "%0.1f%c",
bellard authored
1187
1188
1189
1190
                         (double)size / base,
                         suffixes[i]);
                break;
            } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1191
                snprintf(buf, buf_size, "%" PRId64 "%c",
bellard authored
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
                         ((size + (base >> 1)) / base),
                         suffixes[i]);
                break;
            }
            base = base * 1024;
        }
    }
    return buf;
}

char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
{
    char buf1[128], date_buf[128], clock_buf[128];
1205
1206
1207
#ifdef _WIN32
    struct tm *ptm;
#else
bellard authored
1208
    struct tm tm;
1209
#endif
bellard authored
1210
1211
1212
1213
    time_t ti;
    int64_t secs;

    if (!sn) {
1214
1215
        snprintf(buf, buf_size,
                 "%-10s%-20s%7s%20s%15s",
bellard authored
1216
1217
1218
                 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
    } else {
        ti = sn->date_sec;
1219
1220
1221
1222
1223
#ifdef _WIN32
        ptm = localtime(&ti);
        strftime(date_buf, sizeof(date_buf),
                 "%Y-%m-%d %H:%M:%S", ptm);
#else
bellard authored
1224
1225
1226
        localtime_r(&ti, &tm);
        strftime(date_buf, sizeof(date_buf),
                 "%Y-%m-%d %H:%M:%S", &tm);
1227
#endif
bellard authored
1228
1229
1230
1231
1232
        secs = sn->vm_clock_nsec / 1000000000;
        snprintf(clock_buf, sizeof(clock_buf),
                 "%02d:%02d:%02d.%03d",
                 (int)(secs / 3600),
                 (int)((secs / 60) % 60),
1233
                 (int)(secs % 60),
bellard authored
1234
1235
                 (int)((sn->vm_clock_nsec / 1000000) % 1000));
        snprintf(buf, buf_size,
1236
                 "%-10s%-20s%7s%20s%15s",
bellard authored
1237
1238
1239
1240
1241
1242
1243
1244
                 sn->id_str, sn->name,
                 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
                 date_buf,
                 clock_buf);
    }
    return buf;
}
bellard authored
1245
bellard authored
1246
/**************************************************************/
bellard authored
1247
/* async I/Os */
bellard authored
1248
1249
1250
1251
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
                                uint8_t *buf, int nb_sectors,
                                BlockDriverCompletionFunc *cb, void *opaque)
bellard authored
1252
1253
{
    BlockDriver *drv = bs->drv;
1254
    BlockDriverAIOCB *ret;
bellard authored
1255
1256
    if (!drv)
1257
        return NULL;
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
    ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);

    if (ret) {
	/* Update stats even though technically transfer has not happened. */
	bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
	bs->rd_ops ++;
    }

    return ret;
bellard authored
1268
1269
}
1270
1271
1272
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
                                 const uint8_t *buf, int nb_sectors,
                                 BlockDriverCompletionFunc *cb, void *opaque)
bellard authored
1273
{
bellard authored
1274
    BlockDriver *drv = bs->drv;
1275
    BlockDriverAIOCB *ret;
bellard authored
1276
1277
    if (!drv)
1278
        return NULL;
bellard authored
1279
    if (bs->read_only)
1280
        return NULL;
bellard authored
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
    ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);

    if (ret) {
	/* Update stats even though technically transfer has not happened. */
	bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
	bs->wr_ops ++;
    }

    return ret;
bellard authored
1291
1292
1293
1294
}

void bdrv_aio_cancel(BlockDriverAIOCB *acb)
{
1295
    BlockDriver *drv = acb->bs->drv;
bellard authored
1296
1297
    drv->bdrv_aio_cancel(acb);
bellard authored
1298
1299
}
1300
bellard authored
1301
1302
1303
/**************************************************************/
/* async block device emulation */
1304
static void bdrv_aio_bh_cb(void *opaque)
bellard authored
1305
{
1306
1307
1308
    BlockDriverAIOCBSync *acb = opaque;
    acb->common.cb(acb->common.opaque, acb->ret);
    qemu_aio_release(acb);
bellard authored
1309
}
1310
1311
1312
1313
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
        int64_t sector_num, uint8_t *buf, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque)
bellard authored
1314
{
1315
    BlockDriverAIOCBSync *acb;
bellard authored
1316
    int ret;
1317
1318
1319
1320
1321
1322
1323
1324

    acb = qemu_aio_get(bs, cb, opaque);
    if (!acb->bh)
        acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
    ret = bdrv_read(bs, sector_num, buf, nb_sectors);
    acb->ret = ret;
    qemu_bh_schedule(acb->bh);
    return &acb->common;
1325
1326
}
1327
1328
1329
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
        int64_t sector_num, const uint8_t *buf, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque)
1330
{
1331
    BlockDriverAIOCBSync *acb;
bellard authored
1332
1333
    int ret;
1334
1335
1336
1337
1338
1339
1340
    acb = qemu_aio_get(bs, cb, opaque);
    if (!acb->bh)
        acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
    ret = bdrv_write(bs, sector_num, buf, nb_sectors);
    acb->ret = ret;
    qemu_bh_schedule(acb->bh);
    return &acb->common;
1341
1342
}
1343
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
bellard authored
1344
{
1345
1346
1347
    BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
    qemu_bh_cancel(acb->bh);
    qemu_aio_release(acb);
bellard authored
1348
}
bellard authored
1349
bellard authored
1350
1351
/**************************************************************/
/* sync block device emulation */
bellard authored
1352
bellard authored
1353
1354
1355
static void bdrv_rw_em_cb(void *opaque, int ret)
{
    *(int *)opaque = ret;
bellard authored
1356
1357
}
bellard authored
1358
1359
#define NOT_DONE 0x7fffffff
1360
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
bellard authored
1361
                        uint8_t *buf, int nb_sectors)
pbrook authored
1362
{
1363
1364
    int async_ret;
    BlockDriverAIOCB *acb;
bellard authored
1365
1366

    async_ret = NOT_DONE;
1367
    acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
bellard authored
1368
                        bdrv_rw_em_cb, &async_ret);
1369
    if (acb == NULL)
1370
        return -1;
1371
bellard authored
1372
1373
1374
    while (async_ret == NOT_DONE) {
        qemu_aio_wait();
    }
1375
bellard authored
1376
    return async_ret;
pbrook authored
1377
1378
}
bellard authored
1379
1380
1381
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                         const uint8_t *buf, int nb_sectors)
{
1382
1383
    int async_ret;
    BlockDriverAIOCB *acb;
bellard authored
1384
1385

    async_ret = NOT_DONE;
1386
    acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
bellard authored
1387
                         bdrv_rw_em_cb, &async_ret);
1388
    if (acb == NULL)
1389
        return -1;
bellard authored
1390
1391
1392
1393
1394
    while (async_ret == NOT_DONE) {
        qemu_aio_wait();
    }
    return async_ret;
}
bellard authored
1395
1396
1397
1398

void bdrv_init(void)
{
    bdrv_register(&bdrv_raw);
1399
    bdrv_register(&bdrv_host_device);
bellard authored
1400
1401
1402
1403
1404
#ifndef _WIN32
    bdrv_register(&bdrv_cow);
#endif
    bdrv_register(&bdrv_qcow);
    bdrv_register(&bdrv_vmdk);
1405
    bdrv_register(&bdrv_cloop);
1406
    bdrv_register(&bdrv_dmg);
1407
    bdrv_register(&bdrv_bochs);
1408
    bdrv_register(&bdrv_vpc);
bellard authored
1409
    bdrv_register(&bdrv_vvfat);
bellard authored
1410
    bdrv_register(&bdrv_qcow2);
1411
    bdrv_register(&bdrv_parallels);
1412
    bdrv_register(&bdrv_nbd);
bellard authored
1413
}
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442

void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
                   void *opaque)
{
    BlockDriver *drv;
    BlockDriverAIOCB *acb;

    drv = bs->drv;
    if (drv->free_aiocb) {
        acb = drv->free_aiocb;
        drv->free_aiocb = acb->next;
    } else {
        acb = qemu_mallocz(drv->aiocb_size);
        if (!acb)
            return NULL;
    }
    acb->bs = bs;
    acb->cb = cb;
    acb->opaque = opaque;
    return acb;
}

void qemu_aio_release(void *p)
{
    BlockDriverAIOCB *acb = p;
    BlockDriver *drv = acb->bs->drv;
    acb->next = drv->free_aiocb;
    drv->free_aiocb = acb;
}
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463

/**************************************************************/
/* removable device support */

/**
 * Return TRUE if the media is present
 */
int bdrv_is_inserted(BlockDriverState *bs)
{
    BlockDriver *drv = bs->drv;
    int ret;
    if (!drv)
        return 0;
    if (!drv->bdrv_is_inserted)
        return 1;
    ret = drv->bdrv_is_inserted(bs);
    return ret;
}

/**
 * Return TRUE if the media changed since the last call to this
1464
 * function. It is currently only used for floppy disks
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
 */
int bdrv_media_changed(BlockDriverState *bs)
{
    BlockDriver *drv = bs->drv;
    int ret;

    if (!drv || !drv->bdrv_media_changed)
        ret = -ENOTSUP;
    else
        ret = drv->bdrv_media_changed(bs);
    if (ret == -ENOTSUP)
        ret = bs->media_changed;
    bs->media_changed = 0;
    return ret;
}

/**
 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
 */
void bdrv_eject(BlockDriverState *bs, int eject_flag)
{
    BlockDriver *drv = bs->drv;
    int ret;

    if (!drv || !drv->bdrv_eject) {
        ret = -ENOTSUP;
    } else {
        ret = drv->bdrv_eject(bs, eject_flag);
    }
    if (ret == -ENOTSUP) {
        if (eject_flag)
            bdrv_close(bs);
    }
}

int bdrv_is_locked(BlockDriverState *bs)
{
    return bs->locked;
}

/**
 * Lock or unlock the media (if it is locked, the user won't be able
 * to eject it manually).
 */
void bdrv_set_locked(BlockDriverState *bs, int locked)
{
    BlockDriver *drv = bs->drv;

    bs->locked = locked;
    if (drv && drv->bdrv_set_locked) {
        drv->bdrv_set_locked(bs, locked);
    }
}
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528

/* needed for generic scsi interface */

int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
    BlockDriver *drv = bs->drv;

    if (drv && drv->bdrv_ioctl)
        return drv->bdrv_ioctl(bs, req, buf);
    return -ENOTSUP;
}