Blame view

block.c 35.5 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.
 */
pbrook authored
24
#include "qemu-common.h"
pbrook authored
25
#include "console.h"
bellard authored
26
#include "block_int.h"
bellard authored
27
bellard authored
28
29
30
31
32
33
34
35
#ifdef _BSD
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/disk.h>
#endif
bellard authored
36
37
38
#define SECTOR_BITS 9
#define SECTOR_SIZE (1 << SECTOR_BITS)
bellard authored
39
40
41
42
43
44
typedef struct BlockDriverAIOCBSync {
    BlockDriverAIOCB common;
    QEMUBH *bh;
    int ret;
} BlockDriverAIOCBSync;
45
46
47
48
49
50
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
51
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
52
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
bellard authored
53
54
55
                        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
56
57
58
BlockDriverState *bdrv_first;
bellard authored
59
60
static BlockDriver *first_drv;
bellard authored
61
int path_is_absolute(const char *path)
62
{
bellard authored
63
    const char *p;
64
65
66
67
68
#ifdef _WIN32
    /* specific case for names like: "\\.\d:" */
    if (*path == '/' || *path == '\\')
        return 1;
#endif
bellard authored
69
70
71
72
73
    p = strchr(path, ':');
    if (p)
        p++;
    else
        p = path;
74
75
76
77
78
#ifdef _WIN32
    return (*p == '/' || *p == '\\');
#else
    return (*p == '/');
#endif
79
80
}
bellard authored
81
82
83
84
85
86
/* 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)
87
{
bellard authored
88
89
90
91
92
93
94
95
96
97
98
99
100
    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;
101
102
103
104
105
106
107
108
109
        p1 = strrchr(base_path, '/');
#ifdef _WIN32
        {
            const char *p2;
            p2 = strrchr(base_path, '\\');
            if (!p1 || p2 > p1)
                p1 = p2;
        }
#endif
bellard authored
110
111
112
113
114
115
116
117
118
119
120
121
        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);
122
123
124
125
    }
}
126
static void bdrv_register(BlockDriver *bdrv)
bellard authored
127
{
128
    if (!bdrv->bdrv_aio_read) {
bellard authored
129
130
131
132
        /* 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
133
        bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
bellard authored
134
135
136
137
138
    } 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
139
140
141
    bdrv->next = first_drv;
    first_drv = bdrv;
}
bellard authored
142
143
144
145
146
147
148
149
150
151

/* 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
152
153
154
155
156
157
158
    if (device_name[0] != '\0') {
        /* insert at the end */
        pbs = &bdrv_first;
        while (*pbs != NULL)
            pbs = &(*pbs)->next;
        *pbs = bs;
    }
bellard authored
159
160
161
    return bs;
}
bellard authored
162
163
164
165
166
167
168
169
170
171
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;
}
172
int bdrv_create(BlockDriver *drv,
bellard authored
173
174
175
176
177
178
179
180
                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
181
#ifdef _WIN32
182
void get_tmp_filename(char *filename, int size)
bellard authored
183
{
184
    char temp_dir[MAX_PATH];
185
186
187
    GetTempPath(MAX_PATH, temp_dir);
    GetTempFileName(temp_dir, "qem", 0, filename);
bellard authored
188
189
}
#else
190
void get_tmp_filename(char *filename, int size)
bellard authored
191
{
192
    int fd;
193
    const char *tmpdir;
bellard authored
194
    /* XXX: race condition possible */
195
196
197
198
    tmpdir = getenv("TMPDIR");
    if (!tmpdir)
        tmpdir = "/tmp";
    snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
bellard authored
199
200
201
    fd = mkstemp(filename);
    close(fd);
}
bellard authored
202
#endif
bellard authored
203
204
#ifdef _WIN32
bellard authored
205
206
207
208
209
210
static int is_windows_drive_prefix(const char *filename)
{
    return (((filename[0] >= 'a' && filename[0] <= 'z') ||
             (filename[0] >= 'A' && filename[0] <= 'Z')) &&
            filename[1] == ':');
}
211
212
213
static int is_windows_drive(const char *filename)
{
214
    if (is_windows_drive_prefix(filename) &&
bellard authored
215
        filename[2] == '\0')
216
217
218
219
220
221
222
223
        return 1;
    if (strstart(filename, "\\\\.\\", NULL) ||
        strstart(filename, "//./", NULL))
        return 1;
    return 0;
}
#endif
bellard authored
224
225
226
227
228
229
static BlockDriver *find_protocol(const char *filename)
{
    BlockDriver *drv1;
    char protocol[128];
    int len;
    const char *p;
230
231

#ifdef _WIN32
bellard authored
232
233
    if (is_windows_drive(filename) ||
        is_windows_drive_prefix(filename))
234
235
        return &bdrv_raw;
#endif
bellard authored
236
237
238
239
240
241
242
243
244
    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) {
245
        if (drv1->protocol_name &&
bellard authored
246
247
248
249
250
251
            !strcmp(drv1->protocol_name, protocol))
            return drv1;
    }
    return NULL;
}
bellard authored
252
253
/* XXX: force raw format if block or character device ? It would
   simplify the BSD case */
bellard authored
254
255
static BlockDriver *find_image_format(const char *filename)
{
bellard authored
256
    int ret, score, score_max;
bellard authored
257
    BlockDriver *drv1, *drv;
bellard authored
258
259
    uint8_t buf[2048];
    BlockDriverState *bs;
260
261
262
263
264
265
266
267
268
269
270
    /* 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;
271
        if (stat(filename, &st) >= 0 &&
272
273
274
275
276
            (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
            return &bdrv_host_device;
        }
    }
#endif
277
bellard authored
278
    drv = find_protocol(filename);
279
    /* no need to test disk image formats for vvfat */
bellard authored
280
281
    if (drv == &bdrv_vvfat)
        return drv;
282
bellard authored
283
284
285
286
287
288
289
290
291
    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
292
293
    score_max = 0;
    for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
bellard authored
294
295
296
297
298
299
        if (drv1->bdrv_probe) {
            score = drv1->bdrv_probe(buf, ret, filename);
            if (score > score_max) {
                score_max = score;
                drv = drv1;
            }
bellard authored
300
        }
bellard authored
301
    }
bellard authored
302
303
304
    return drv;
}
bellard authored
305
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
bellard authored
306
{
bellard authored
307
308
309
310
311
312
313
314
315
316
    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;
317
    }
bellard authored
318
319
320
321
322
323
324
    *pbs = bs;
    return 0;
}

int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
{
    return bdrv_open2(bs, filename, flags, NULL);
bellard authored
325
326
}
bellard authored
327
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
bellard authored
328
329
               BlockDriver *drv)
{
bellard authored
330
    int ret, open_flags;
331
332
    char tmp_filename[PATH_MAX];
    char backing_filename[PATH_MAX];
333
bellard authored
334
335
336
    bs->read_only = 0;
    bs->is_temporary = 0;
    bs->encrypted = 0;
bellard authored
337
bellard authored
338
    if (flags & BDRV_O_SNAPSHOT) {
bellard authored
339
340
        BlockDriverState *bs1;
        int64_t total_size;
341
        int is_protocol = 0;
342
bellard authored
343
344
        /* if snapshot, we create a temporary backing file and open it
           instead of opening 'filename' directly */
345
bellard authored
346
347
348
        /* if there is a backing file, use it */
        bs1 = bdrv_new("");
        if (!bs1) {
bellard authored
349
            return -ENOMEM;
bellard authored
350
351
352
353
354
        }
        if (bdrv_open(bs1, filename, 0) < 0) {
            bdrv_delete(bs1);
            return -1;
        }
bellard authored
355
        total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
356
357
358
359

        if (bs1->drv && bs1->drv->protocol_name)
            is_protocol = 1;
bellard authored
360
        bdrv_delete(bs1);
361
bellard authored
362
        get_tmp_filename(tmp_filename, sizeof(tmp_filename));
363
364
365
366
367
368
369
370

        /* Real path is meaningless for protocols */
        if (is_protocol)
            snprintf(backing_filename, sizeof(backing_filename),
                     "%s", filename);
        else
            realpath(filename, backing_filename);
371
        if (bdrv_create(&bdrv_qcow2, tmp_filename,
372
                        total_size, backing_filename, 0) < 0) {
bellard authored
373
374
375
376
377
            return -1;
        }
        filename = tmp_filename;
        bs->is_temporary = 1;
    }
bellard authored
378
bellard authored
379
    pstrcpy(bs->filename, sizeof(bs->filename), filename);
bellard authored
380
381
    if (flags & BDRV_O_FILE) {
        drv = find_protocol(filename);
bellard authored
382
        if (!drv)
bellard authored
383
384
385
386
387
388
389
            return -ENOENT;
    } else {
        if (!drv) {
            drv = find_image_format(filename);
            if (!drv)
                return -1;
        }
bellard authored
390
391
392
393
394
    }
    bs->drv = drv;
    bs->opaque = qemu_mallocz(drv->instance_size);
    if (bs->opaque == NULL && drv->instance_size > 0)
        return -1;
bellard authored
395
396
397
    /* Note: for compatibility, we open disk image files as RDWR, and
       RDONLY as fallback */
    if (!(flags & BDRV_O_FILE))
398
        open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK);
bellard authored
399
400
401
    else
        open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
    ret = drv->bdrv_open(bs, filename, open_flags);
402
    if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
403
        ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
bellard authored
404
405
        bs->read_only = 1;
    }
bellard authored
406
407
    if (ret < 0) {
        qemu_free(bs->opaque);
bellard authored
408
409
        bs->opaque = NULL;
        bs->drv = NULL;
bellard authored
410
        return ret;
411
    }
412
413
414
    if (drv->bdrv_getlength) {
        bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
    }
415
#ifndef _WIN32
bellard authored
416
417
418
419
    if (bs->is_temporary) {
        unlink(filename);
    }
#endif
bellard authored
420
    if (bs->backing_file[0] != '\0') {
bellard authored
421
422
423
424
425
        /* if there is a backing file, use it */
        bs->backing_hd = bdrv_new("");
        if (!bs->backing_hd) {
        fail:
            bdrv_close(bs);
bellard authored
426
            return -ENOMEM;
427
        }
bellard authored
428
429
        path_combine(backing_filename, sizeof(backing_filename),
                     filename, bs->backing_file);
430
        if (bdrv_open(bs->backing_hd, backing_filename, open_flags) < 0)
431
432
433
            goto fail;
    }
bellard authored
434
    /* call the change callback */
435
    bs->media_changed = 1;
bellard authored
436
437
438
439
    if (bs->change_cb)
        bs->change_cb(bs->change_opaque);

    return 0;
bellard authored
440
441
442
443
}

void bdrv_close(BlockDriverState *bs)
{
444
    if (bs->drv) {
bellard authored
445
446
447
448
449
450
451
452
        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);
        }
453
#endif
bellard authored
454
455
        bs->opaque = NULL;
        bs->drv = NULL;
bellard authored
456
457

        /* call the change callback */
458
        bs->media_changed = 1;
bellard authored
459
460
461
462
463
464
465
        if (bs->change_cb)
            bs->change_cb(bs->change_opaque);
    }
}

void bdrv_delete(BlockDriverState *bs)
{
466
467
468
469
470
471
472
473
    BlockDriverState **pbs;

    pbs = &bdrv_first;
    while (*pbs != bs && *pbs != NULL)
        pbs = &(*pbs)->next;
    if (*pbs == bs)
        *pbs = bs->next;
bellard authored
474
475
    bdrv_close(bs);
    qemu_free(bs);
bellard authored
476
477
}
478
479
480
/* commit COW file into the raw image */
int bdrv_commit(BlockDriverState *bs)
{
481
    BlockDriver *drv = bs->drv;
bellard authored
482
    int64_t i, total_sectors;
bellard authored
483
484
    int n, j;
    unsigned char sector[512];
485
486
487
    if (!drv)
        return -ENOMEDIUM;
488
489

    if (bs->read_only) {
bellard authored
490
	return -EACCES;
491
492
    }
bellard authored
493
494
495
    if (!bs->backing_hd) {
	return -ENOTSUP;
    }
496
bellard authored
497
498
    total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
    for (i = 0; i < total_sectors;) {
499
        if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
bellard authored
500
501
502
503
504
505
506
507
508
            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++;
509
	    }
bellard authored
510
511
512
	} else {
            i += n;
        }
513
    }
514
515
516
    if (drv->bdrv_make_empty)
	return drv->bdrv_make_empty(bs);
517
518
519
520
    return 0;
}
521
/* return < 0 if error. See bdrv_write() for the return codes */
522
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
bellard authored
523
524
              uint8_t *buf, int nb_sectors)
{
bellard authored
525
526
    BlockDriver *drv = bs->drv;
527
528
    if (!drv)
        return -ENOMEDIUM;
bellard authored
529
bellard authored
530
531
532
533
534
535
536
    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)
537
            return -EINVAL;
538
539
540
        else {
	    bs->rd_bytes += (unsigned) len;
	    bs->rd_ops ++;
bellard authored
541
            return 0;
542
	}
bellard authored
543
544
    } else {
        return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
545
    }
bellard authored
546
547
}
548
/* Return < 0 if error. Important errors are:
549
550
551
552
553
  -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
*/
554
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
bellard authored
555
556
               const uint8_t *buf, int nb_sectors)
{
bellard authored
557
    BlockDriver *drv = bs->drv;
558
559
    if (!bs->drv)
        return -ENOMEDIUM;
bellard authored
560
    if (bs->read_only)
561
        return -EACCES;
bellard authored
562
563
564
565
566
567
568
569
    if (drv->bdrv_pwrite) {
        int ret, len;
        len = nb_sectors * 512;
        ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
        if (ret < 0)
            return ret;
        else if (ret != len)
            return -EIO;
570
571
572
        else {
	    bs->wr_bytes += (unsigned) len;
	    bs->wr_ops ++;
bellard authored
573
            return 0;
574
	}
bellard authored
575
576
577
578
579
    } else {
        return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
    }
}
580
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
bellard authored
581
                         uint8_t *buf, int count1)
bellard authored
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
{
    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;
}
624
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
bellard authored
625
                          const uint8_t *buf, int count1)
bellard authored
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
{
    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;
}

/**
673
 * Read with byte offsets (needed only for file protocols)
bellard authored
674
 */
675
int bdrv_pread(BlockDriverState *bs, int64_t offset,
bellard authored
676
677
678
679
680
               void *buf1, int count1)
{
    BlockDriver *drv = bs->drv;

    if (!drv)
681
        return -ENOMEDIUM;
bellard authored
682
    if (!drv->bdrv_pread)
bellard authored
683
        return bdrv_pread_em(bs, offset, buf1, count1);
bellard authored
684
685
686
    return drv->bdrv_pread(bs, offset, buf1, count1);
}
687
688
/**
 * Write with byte offsets (needed only for file protocols)
bellard authored
689
 */
690
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
bellard authored
691
692
693
694
695
                const void *buf1, int count1)
{
    BlockDriver *drv = bs->drv;

    if (!drv)
696
        return -ENOMEDIUM;
bellard authored
697
    if (!drv->bdrv_pwrite)
bellard authored
698
        return bdrv_pwrite_em(bs, offset, buf1, count1);
bellard authored
699
700
701
702
703
704
705
706
707
708
    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)
709
        return -ENOMEDIUM;
bellard authored
710
711
712
713
714
715
716
717
718
719
720
721
    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)
722
        return -ENOMEDIUM;
bellard authored
723
724
725
726
727
    if (!drv->bdrv_getlength) {
        /* legacy mode */
        return bs->total_sectors * SECTOR_SIZE;
    }
    return drv->bdrv_getlength(bs);
bellard authored
728
729
}
730
/* return 0 as number of sectors if no device present or error */
731
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
bellard authored
732
{
733
734
735
736
737
738
739
    int64_t length;
    length = bdrv_getlength(bs);
    if (length < 0)
        length = 0;
    else
        length = length >> SECTOR_BITS;
    *nb_sectors_ptr = length;
bellard authored
740
}
bellard authored
741
742
void bdrv_set_geometry_hint(BlockDriverState *bs,
bellard authored
743
744
745
746
747
748
749
750
751
752
753
754
755
756
                            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));
}
757
758
759
760
761
void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
{
    bs->translation = translation;
}
762
void bdrv_get_geometry_hint(BlockDriverState *bs,
bellard authored
763
764
765
766
767
768
769
770
771
772
773
774
                            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;
}
775
776
777
778
779
int bdrv_get_translation_hint(BlockDriverState *bs)
{
    return bs->translation;
}
bellard authored
780
781
782
783
784
785
786
787
788
789
int bdrv_is_removable(BlockDriverState *bs)
{
    return bs->removable;
}

int bdrv_is_read_only(BlockDriverState *bs)
{
    return bs->read_only;
}
790
791
792
793
794
int bdrv_is_sg(BlockDriverState *bs)
{
    return bs->sg;
}
795
/* XXX: no longer used */
796
void bdrv_set_change_cb(BlockDriverState *bs,
bellard authored
797
798
799
800
801
802
                        void (*change_cb)(void *opaque), void *opaque)
{
    bs->change_cb = change_cb;
    bs->change_opaque = opaque;
}
bellard authored
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
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)
{
827
    if (!bs->drv) {
bellard authored
828
829
830
831
832
833
        buf[0] = '\0';
    } else {
        pstrcpy(buf, buf_size, bs->drv->format_name);
    }
}
834
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
bellard authored
835
836
837
838
839
840
841
842
843
                         void *opaque)
{
    BlockDriver *drv;

    for (drv = first_drv; drv != NULL; drv = drv->next) {
        it(opaque, drv->format_name);
    }
}
bellard authored
844
845
846
847
848
849
850
851
852
853
854
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
855
856
857
858
859
860
861
862
863
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
864
865
866
867
868
const char *bdrv_get_device_name(BlockDriverState *bs)
{
    return bs->device_name;
}
pbrook authored
869
870
871
872
873
874
875
876
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
877
878
879
880
881
882
883
884
885
886
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);
}
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
/*
 * 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
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
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);
        }
936
        if (bs->drv) {
937
938
939
940
941
942
            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
943
            term_printf(" ro=%d", bs->read_only);
bellard authored
944
945
946
            term_printf(" drv=%s", bs->drv->format_name);
            if (bs->encrypted)
                term_printf(" encrypted");
bellard authored
947
948
949
950
951
952
        } else {
            term_printf(" [not inserted]");
        }
        term_printf("\n");
    }
}
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970

/* 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
971
972
void bdrv_get_backing_filename(BlockDriverState *bs,
bellard authored
973
974
975
976
977
978
979
980
981
                               char *filename, int filename_size)
{
    if (!bs->backing_hd) {
        pstrcpy(filename, filename_size, "");
    } else {
        pstrcpy(filename, filename_size, bs->backing_file);
    }
}
982
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
bellard authored
983
984
985
986
                          const uint8_t *buf, int nb_sectors)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
987
        return -ENOMEDIUM;
bellard authored
988
989
990
991
    if (!drv->bdrv_write_compressed)
        return -ENOTSUP;
    return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
}
992
bellard authored
993
994
995
996
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
997
        return -ENOMEDIUM;
bellard authored
998
999
1000
1001
1002
1003
1004
1005
1006
    if (!drv->bdrv_get_info)
        return -ENOTSUP;
    memset(bdi, 0, sizeof(*bdi));
    return drv->bdrv_get_info(bs, bdi);
}

/**************************************************************/
/* handling of snapshots */
1007
int bdrv_snapshot_create(BlockDriverState *bs,
bellard authored
1008
1009
1010
1011
                         QEMUSnapshotInfo *sn_info)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
1012
        return -ENOMEDIUM;
bellard authored
1013
1014
1015
1016
1017
    if (!drv->bdrv_snapshot_create)
        return -ENOTSUP;
    return drv->bdrv_snapshot_create(bs, sn_info);
}
1018
int bdrv_snapshot_goto(BlockDriverState *bs,
bellard authored
1019
1020
1021
1022
                       const char *snapshot_id)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
1023
        return -ENOMEDIUM;
bellard authored
1024
1025
1026
1027
1028
1029
1030
1031
1032
    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)
1033
        return -ENOMEDIUM;
bellard authored
1034
1035
1036
1037
1038
    if (!drv->bdrv_snapshot_delete)
        return -ENOTSUP;
    return drv->bdrv_snapshot_delete(bs, snapshot_id);
}
1039
int bdrv_snapshot_list(BlockDriverState *bs,
bellard authored
1040
1041
1042
1043
                       QEMUSnapshotInfo **psn_info)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
1044
        return -ENOMEDIUM;
bellard authored
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
    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)) {
1064
                snprintf(buf, buf_size, "%0.1f%c",
bellard authored
1065
1066
1067
1068
                         (double)size / base,
                         suffixes[i]);
                break;
            } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1069
                snprintf(buf, buf_size, "%" PRId64 "%c",
bellard authored
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
                         ((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];
1083
1084
1085
#ifdef _WIN32
    struct tm *ptm;
#else
bellard authored
1086
    struct tm tm;
1087
#endif
bellard authored
1088
1089
1090
1091
    time_t ti;
    int64_t secs;

    if (!sn) {
1092
1093
        snprintf(buf, buf_size,
                 "%-10s%-20s%7s%20s%15s",
bellard authored
1094
1095
1096
                 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
    } else {
        ti = sn->date_sec;
1097
1098
1099
1100
1101
#ifdef _WIN32
        ptm = localtime(&ti);
        strftime(date_buf, sizeof(date_buf),
                 "%Y-%m-%d %H:%M:%S", ptm);
#else
bellard authored
1102
1103
1104
        localtime_r(&ti, &tm);
        strftime(date_buf, sizeof(date_buf),
                 "%Y-%m-%d %H:%M:%S", &tm);
1105
#endif
bellard authored
1106
1107
1108
1109
1110
        secs = sn->vm_clock_nsec / 1000000000;
        snprintf(clock_buf, sizeof(clock_buf),
                 "%02d:%02d:%02d.%03d",
                 (int)(secs / 3600),
                 (int)((secs / 60) % 60),
1111
                 (int)(secs % 60),
bellard authored
1112
1113
                 (int)((sn->vm_clock_nsec / 1000000) % 1000));
        snprintf(buf, buf_size,
1114
                 "%-10s%-20s%7s%20s%15s",
bellard authored
1115
1116
1117
1118
1119
1120
1121
1122
                 sn->id_str, sn->name,
                 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
                 date_buf,
                 clock_buf);
    }
    return buf;
}
bellard authored
1123
bellard authored
1124
/**************************************************************/
bellard authored
1125
/* async I/Os */
bellard authored
1126
1127
1128
1129
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
                                uint8_t *buf, int nb_sectors,
                                BlockDriverCompletionFunc *cb, void *opaque)
bellard authored
1130
1131
{
    BlockDriver *drv = bs->drv;
1132
    BlockDriverAIOCB *ret;
bellard authored
1133
1134
    if (!drv)
1135
        return NULL;
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
    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
1146
1147
}
1148
1149
1150
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
                                 const uint8_t *buf, int nb_sectors,
                                 BlockDriverCompletionFunc *cb, void *opaque)
bellard authored
1151
{
bellard authored
1152
    BlockDriver *drv = bs->drv;
1153
    BlockDriverAIOCB *ret;
bellard authored
1154
1155
    if (!drv)
1156
        return NULL;
bellard authored
1157
    if (bs->read_only)
1158
        return NULL;
bellard authored
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
    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
1169
1170
1171
1172
}

void bdrv_aio_cancel(BlockDriverAIOCB *acb)
{
1173
    BlockDriver *drv = acb->bs->drv;
bellard authored
1174
1175
    drv->bdrv_aio_cancel(acb);
bellard authored
1176
1177
}
1178
bellard authored
1179
1180
1181
/**************************************************************/
/* async block device emulation */
1182
static void bdrv_aio_bh_cb(void *opaque)
bellard authored
1183
{
1184
1185
1186
    BlockDriverAIOCBSync *acb = opaque;
    acb->common.cb(acb->common.opaque, acb->ret);
    qemu_aio_release(acb);
bellard authored
1187
}
1188
1189
1190
1191
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
        int64_t sector_num, uint8_t *buf, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque)
bellard authored
1192
{
1193
    BlockDriverAIOCBSync *acb;
bellard authored
1194
    int ret;
1195
1196
1197
1198
1199
1200
1201
1202

    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;
1203
1204
}
1205
1206
1207
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
        int64_t sector_num, const uint8_t *buf, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque)
1208
{
1209
    BlockDriverAIOCBSync *acb;
bellard authored
1210
1211
    int ret;
1212
1213
1214
1215
1216
1217
1218
    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;
1219
1220
}
1221
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
bellard authored
1222
{
1223
1224
1225
    BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
    qemu_bh_cancel(acb->bh);
    qemu_aio_release(acb);
bellard authored
1226
}
bellard authored
1227
bellard authored
1228
1229
/**************************************************************/
/* sync block device emulation */
bellard authored
1230
bellard authored
1231
1232
1233
static void bdrv_rw_em_cb(void *opaque, int ret)
{
    *(int *)opaque = ret;
bellard authored
1234
1235
}
bellard authored
1236
1237
#define NOT_DONE 0x7fffffff
1238
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
bellard authored
1239
                        uint8_t *buf, int nb_sectors)
pbrook authored
1240
{
1241
1242
    int async_ret;
    BlockDriverAIOCB *acb;
bellard authored
1243
1244

    async_ret = NOT_DONE;
1245
    acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
bellard authored
1246
                        bdrv_rw_em_cb, &async_ret);
1247
    if (acb == NULL)
1248
        return -1;
1249
bellard authored
1250
1251
1252
    while (async_ret == NOT_DONE) {
        qemu_aio_wait();
    }
1253
bellard authored
1254
    return async_ret;
pbrook authored
1255
1256
}
bellard authored
1257
1258
1259
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                         const uint8_t *buf, int nb_sectors)
{
1260
1261
    int async_ret;
    BlockDriverAIOCB *acb;
bellard authored
1262
1263

    async_ret = NOT_DONE;
1264
    acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
bellard authored
1265
                         bdrv_rw_em_cb, &async_ret);
1266
    if (acb == NULL)
1267
        return -1;
bellard authored
1268
1269
1270
1271
1272
    while (async_ret == NOT_DONE) {
        qemu_aio_wait();
    }
    return async_ret;
}
bellard authored
1273
1274
1275
1276

void bdrv_init(void)
{
    bdrv_register(&bdrv_raw);
1277
    bdrv_register(&bdrv_host_device);
bellard authored
1278
1279
1280
1281
1282
#ifndef _WIN32
    bdrv_register(&bdrv_cow);
#endif
    bdrv_register(&bdrv_qcow);
    bdrv_register(&bdrv_vmdk);
1283
    bdrv_register(&bdrv_cloop);
1284
    bdrv_register(&bdrv_dmg);
1285
    bdrv_register(&bdrv_bochs);
1286
    bdrv_register(&bdrv_vpc);
bellard authored
1287
    bdrv_register(&bdrv_vvfat);
bellard authored
1288
    bdrv_register(&bdrv_qcow2);
1289
    bdrv_register(&bdrv_parallels);
1290
    bdrv_register(&bdrv_nbd);
bellard authored
1291
}
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320

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;
}
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341

/**************************************************************/
/* 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
1342
 * function. It is currently only used for floppy disks
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
 */
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);
    }
}
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406

/* 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;
}