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1
/*
2
 * Block driver for RAW files (posix)
3
 *
4
 * Copyright (c) 2006 Fabrice Bellard
5
 *
6
 * Permission is hereby granted, free of charge, to any person obtaining a copy
7
 * of this software and associated documentation files (the "Software"), to deal
8
 * in the Software without restriction, including without limitation the rights
9
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10
 * copies of the Software, and to permit persons to whom the Software is
11
 * furnished to do so, subject to the following conditions:
12
 *
13
 * The above copyright notice and this permission notice shall be included in
14
 * all copies or substantial portions of the Software.
15
 *
16
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22
 * THE SOFTWARE.
23
 */
24
#include "qemu-common.h"
25
#include "qemu-timer.h"
26
#include "qemu-char.h"
27
#include "block_int.h"
28
#include <assert.h>
29
#ifdef CONFIG_AIO
30
#include "posix-aio-compat.h"
31
#endif
32

    
33
#ifdef CONFIG_COCOA
34
#include <paths.h>
35
#include <sys/param.h>
36
#include <IOKit/IOKitLib.h>
37
#include <IOKit/IOBSD.h>
38
#include <IOKit/storage/IOMediaBSDClient.h>
39
#include <IOKit/storage/IOMedia.h>
40
#include <IOKit/storage/IOCDMedia.h>
41
//#include <IOKit/storage/IOCDTypes.h>
42
#include <CoreFoundation/CoreFoundation.h>
43
#endif
44

    
45
#ifdef __sun__
46
#define _POSIX_PTHREAD_SEMANTICS 1
47
#include <signal.h>
48
#include <sys/dkio.h>
49
#endif
50
#ifdef __linux__
51
#include <sys/ioctl.h>
52
#include <linux/cdrom.h>
53
#include <linux/fd.h>
54
#endif
55
#ifdef __FreeBSD__
56
#include <signal.h>
57
#include <sys/disk.h>
58
#include <sys/cdio.h>
59
#endif
60

    
61
#ifdef __OpenBSD__
62
#include <sys/ioctl.h>
63
#include <sys/disklabel.h>
64
#include <sys/dkio.h>
65
#endif
66

    
67
#ifdef __DragonFly__
68
#include <sys/ioctl.h>
69
#include <sys/diskslice.h>
70
#endif
71

    
72
//#define DEBUG_FLOPPY
73

    
74
//#define DEBUG_BLOCK
75
#if defined(DEBUG_BLOCK)
76
#define DEBUG_BLOCK_PRINT(formatCstr, args...) do { if (qemu_log_enabled())        \
77
    { qemu_log(formatCstr, ##args); qemu_log_flush(); } } while (0)
78
#else
79
#define DEBUG_BLOCK_PRINT(formatCstr, args...)
80
#endif
81

    
82
/* OS X does not have O_DSYNC */
83
#ifndef O_DSYNC
84
#define O_DSYNC O_SYNC
85
#endif
86

    
87
/* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
88
#ifndef O_DIRECT
89
#define O_DIRECT O_DSYNC
90
#endif
91

    
92
#define FTYPE_FILE   0
93
#define FTYPE_CD     1
94
#define FTYPE_FD     2
95

    
96
#define ALIGNED_BUFFER_SIZE (32 * 512)
97

    
98
/* if the FD is not accessed during that time (in ms), we try to
99
   reopen it to see if the disk has been changed */
100
#define FD_OPEN_TIMEOUT 1000
101

    
102
typedef struct BDRVRawState {
103
    int fd;
104
    int type;
105
    unsigned int lseek_err_cnt;
106
#if defined(__linux__)
107
    /* linux floppy specific */
108
    int fd_open_flags;
109
    int64_t fd_open_time;
110
    int64_t fd_error_time;
111
    int fd_got_error;
112
    int fd_media_changed;
113
#endif
114
#if defined(__FreeBSD__)
115
    int cd_open_flags;
116
#endif
117
    uint8_t* aligned_buf;
118
} BDRVRawState;
119

    
120
static int posix_aio_init(void);
121

    
122
static int fd_open(BlockDriverState *bs);
123

    
124
#if defined(__FreeBSD__)
125
static int cd_open(BlockDriverState *bs);
126
#endif
127

    
128
static int raw_is_inserted(BlockDriverState *bs);
129

    
130
static int raw_open(BlockDriverState *bs, const char *filename, int flags)
131
{
132
    BDRVRawState *s = bs->opaque;
133
    int fd, open_flags, ret;
134

    
135
    posix_aio_init();
136

    
137
    s->lseek_err_cnt = 0;
138

    
139
    open_flags = O_BINARY;
140
    if ((flags & BDRV_O_ACCESS) == O_RDWR) {
141
        open_flags |= O_RDWR;
142
    } else {
143
        open_flags |= O_RDONLY;
144
        bs->read_only = 1;
145
    }
146
    if (flags & BDRV_O_CREAT)
147
        open_flags |= O_CREAT | O_TRUNC;
148

    
149
    /* Use O_DSYNC for write-through caching, no flags for write-back caching,
150
     * and O_DIRECT for no caching. */
151
    if ((flags & BDRV_O_NOCACHE))
152
        open_flags |= O_DIRECT;
153
    else if (!(flags & BDRV_O_CACHE_WB))
154
        open_flags |= O_DSYNC;
155

    
156
    s->type = FTYPE_FILE;
157

    
158
    fd = open(filename, open_flags, 0644);
159
    if (fd < 0) {
160
        ret = -errno;
161
        if (ret == -EROFS)
162
            ret = -EACCES;
163
        return ret;
164
    }
165
    s->fd = fd;
166
    s->aligned_buf = NULL;
167
    if ((flags & BDRV_O_NOCACHE)) {
168
        s->aligned_buf = qemu_memalign(512, ALIGNED_BUFFER_SIZE);
169
        if (s->aligned_buf == NULL) {
170
            ret = -errno;
171
            close(fd);
172
            return ret;
173
        }
174
    }
175
    return 0;
176
}
177

    
178
/* XXX: use host sector size if necessary with:
179
#ifdef DIOCGSECTORSIZE
180
        {
181
            unsigned int sectorsize = 512;
182
            if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
183
                sectorsize > bufsize)
184
                bufsize = sectorsize;
185
        }
186
#endif
187
#ifdef CONFIG_COCOA
188
        u_int32_t   blockSize = 512;
189
        if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
190
            bufsize = blockSize;
191
        }
192
#endif
193
*/
194

    
195
/*
196
 * offset and count are in bytes, but must be multiples of 512 for files
197
 * opened with O_DIRECT. buf must be aligned to 512 bytes then.
198
 *
199
 * This function may be called without alignment if the caller ensures
200
 * that O_DIRECT is not in effect.
201
 */
202
static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
203
                     uint8_t *buf, int count)
204
{
205
    BDRVRawState *s = bs->opaque;
206
    int ret;
207

    
208
    ret = fd_open(bs);
209
    if (ret < 0)
210
        return ret;
211

    
212
    if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
213
        ++(s->lseek_err_cnt);
214
        if(s->lseek_err_cnt <= 10) {
215
            DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
216
                              "] lseek failed : %d = %s\n",
217
                              s->fd, bs->filename, offset, buf, count,
218
                              bs->total_sectors, errno, strerror(errno));
219
        }
220
        return -1;
221
    }
222
    s->lseek_err_cnt=0;
223

    
224
    ret = read(s->fd, buf, count);
225
    if (ret == count)
226
        goto label__raw_read__success;
227

    
228
    DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
229
                      "] read failed %d : %d = %s\n",
230
                      s->fd, bs->filename, offset, buf, count,
231
                      bs->total_sectors, ret, errno, strerror(errno));
232

    
233
    /* Try harder for CDrom. */
234
    if (bs->type == BDRV_TYPE_CDROM) {
235
        lseek(s->fd, offset, SEEK_SET);
236
        ret = read(s->fd, buf, count);
237
        if (ret == count)
238
            goto label__raw_read__success;
239
        lseek(s->fd, offset, SEEK_SET);
240
        ret = read(s->fd, buf, count);
241
        if (ret == count)
242
            goto label__raw_read__success;
243

    
244
        DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
245
                          "] retry read failed %d : %d = %s\n",
246
                          s->fd, bs->filename, offset, buf, count,
247
                          bs->total_sectors, ret, errno, strerror(errno));
248
    }
249

    
250
label__raw_read__success:
251

    
252
    return ret;
253
}
254

    
255
/*
256
 * offset and count are in bytes, but must be multiples of 512 for files
257
 * opened with O_DIRECT. buf must be aligned to 512 bytes then.
258
 *
259
 * This function may be called without alignment if the caller ensures
260
 * that O_DIRECT is not in effect.
261
 */
262
static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
263
                      const uint8_t *buf, int count)
264
{
265
    BDRVRawState *s = bs->opaque;
266
    int ret;
267

    
268
    ret = fd_open(bs);
269
    if (ret < 0)
270
        return -errno;
271

    
272
    if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
273
        ++(s->lseek_err_cnt);
274
        if(s->lseek_err_cnt) {
275
            DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%"
276
                              PRId64 "] lseek failed : %d = %s\n",
277
                              s->fd, bs->filename, offset, buf, count,
278
                              bs->total_sectors, errno, strerror(errno));
279
        }
280
        return -EIO;
281
    }
282
    s->lseek_err_cnt = 0;
283

    
284
    ret = write(s->fd, buf, count);
285
    if (ret == count)
286
        goto label__raw_write__success;
287

    
288
    DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
289
                      "] write failed %d : %d = %s\n",
290
                      s->fd, bs->filename, offset, buf, count,
291
                      bs->total_sectors, ret, errno, strerror(errno));
292

    
293
label__raw_write__success:
294

    
295
    return  (ret < 0) ? -errno : ret;
296
}
297

    
298

    
299
/*
300
 * offset and count are in bytes and possibly not aligned. For files opened
301
 * with O_DIRECT, necessary alignments are ensured before calling
302
 * raw_pread_aligned to do the actual read.
303
 */
304
static int raw_pread(BlockDriverState *bs, int64_t offset,
305
                     uint8_t *buf, int count)
306
{
307
    BDRVRawState *s = bs->opaque;
308
    int size, ret, shift, sum;
309

    
310
    sum = 0;
311

    
312
    if (s->aligned_buf != NULL)  {
313

    
314
        if (offset & 0x1ff) {
315
            /* align offset on a 512 bytes boundary */
316

    
317
            shift = offset & 0x1ff;
318
            size = (shift + count + 0x1ff) & ~0x1ff;
319
            if (size > ALIGNED_BUFFER_SIZE)
320
                size = ALIGNED_BUFFER_SIZE;
321
            ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size);
322
            if (ret < 0)
323
                return ret;
324

    
325
            size = 512 - shift;
326
            if (size > count)
327
                size = count;
328
            memcpy(buf, s->aligned_buf + shift, size);
329

    
330
            buf += size;
331
            offset += size;
332
            count -= size;
333
            sum += size;
334

    
335
            if (count == 0)
336
                return sum;
337
        }
338
        if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
339

    
340
            /* read on aligned buffer */
341

    
342
            while (count) {
343

    
344
                size = (count + 0x1ff) & ~0x1ff;
345
                if (size > ALIGNED_BUFFER_SIZE)
346
                    size = ALIGNED_BUFFER_SIZE;
347

    
348
                ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
349
                if (ret < 0)
350
                    return ret;
351

    
352
                size = ret;
353
                if (size > count)
354
                    size = count;
355

    
356
                memcpy(buf, s->aligned_buf, size);
357

    
358
                buf += size;
359
                offset += size;
360
                count -= size;
361
                sum += size;
362
            }
363

    
364
            return sum;
365
        }
366
    }
367

    
368
    return raw_pread_aligned(bs, offset, buf, count) + sum;
369
}
370

    
371
static int raw_read(BlockDriverState *bs, int64_t sector_num,
372
                    uint8_t *buf, int nb_sectors)
373
{
374
    int ret;
375

    
376
    ret = raw_pread(bs, sector_num * 512, buf, nb_sectors * 512);
377
    if (ret == (nb_sectors * 512))
378
        ret = 0;
379
    return ret;
380
}
381

    
382
/*
383
 * offset and count are in bytes and possibly not aligned. For files opened
384
 * with O_DIRECT, necessary alignments are ensured before calling
385
 * raw_pwrite_aligned to do the actual write.
386
 */
387
static int raw_pwrite(BlockDriverState *bs, int64_t offset,
388
                      const uint8_t *buf, int count)
389
{
390
    BDRVRawState *s = bs->opaque;
391
    int size, ret, shift, sum;
392

    
393
    sum = 0;
394

    
395
    if (s->aligned_buf != NULL) {
396

    
397
        if (offset & 0x1ff) {
398
            /* align offset on a 512 bytes boundary */
399
            shift = offset & 0x1ff;
400
            ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, 512);
401
            if (ret < 0)
402
                return ret;
403

    
404
            size = 512 - shift;
405
            if (size > count)
406
                size = count;
407
            memcpy(s->aligned_buf + shift, buf, size);
408

    
409
            ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf, 512);
410
            if (ret < 0)
411
                return ret;
412

    
413
            buf += size;
414
            offset += size;
415
            count -= size;
416
            sum += size;
417

    
418
            if (count == 0)
419
                return sum;
420
        }
421
        if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
422

    
423
            while ((size = (count & ~0x1ff)) != 0) {
424

    
425
                if (size > ALIGNED_BUFFER_SIZE)
426
                    size = ALIGNED_BUFFER_SIZE;
427

    
428
                memcpy(s->aligned_buf, buf, size);
429

    
430
                ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size);
431
                if (ret < 0)
432
                    return ret;
433

    
434
                buf += ret;
435
                offset += ret;
436
                count -= ret;
437
                sum += ret;
438
            }
439
            /* here, count < 512 because (count & ~0x1ff) == 0 */
440
            if (count) {
441
                ret = raw_pread_aligned(bs, offset, s->aligned_buf, 512);
442
                if (ret < 0)
443
                    return ret;
444
                 memcpy(s->aligned_buf, buf, count);
445

    
446
                 ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, 512);
447
                 if (ret < 0)
448
                     return ret;
449
                 if (count < ret)
450
                     ret = count;
451

    
452
                 sum += ret;
453
            }
454
            return sum;
455
        }
456
    }
457
    return raw_pwrite_aligned(bs, offset, buf, count) + sum;
458
}
459

    
460
static int raw_write(BlockDriverState *bs, int64_t sector_num,
461
                     const uint8_t *buf, int nb_sectors)
462
{
463
    int ret;
464
    ret = raw_pwrite(bs, sector_num * 512, buf, nb_sectors * 512);
465
    if (ret == (nb_sectors * 512))
466
        ret = 0;
467
    return ret;
468
}
469

    
470
#ifdef CONFIG_AIO
471
/***********************************************************/
472
/* Unix AIO using POSIX AIO */
473

    
474
typedef struct RawAIOCB {
475
    BlockDriverAIOCB common;
476
    struct qemu_paiocb aiocb;
477
    struct RawAIOCB *next;
478
    int ret;
479
} RawAIOCB;
480

    
481
typedef struct PosixAioState
482
{
483
    int rfd, wfd;
484
    RawAIOCB *first_aio;
485
} PosixAioState;
486

    
487
static void posix_aio_read(void *opaque)
488
{
489
    PosixAioState *s = opaque;
490
    RawAIOCB *acb, **pacb;
491
    int ret;
492
    ssize_t len;
493

    
494
    /* read all bytes from signal pipe */
495
    for (;;) {
496
        char bytes[16];
497

    
498
        len = read(s->rfd, bytes, sizeof(bytes));
499
        if (len == -1 && errno == EINTR)
500
            continue; /* try again */
501
        if (len == sizeof(bytes))
502
            continue; /* more to read */
503
        break;
504
    }
505

    
506
    for(;;) {
507
        pacb = &s->first_aio;
508
        for(;;) {
509
            acb = *pacb;
510
            if (!acb)
511
                goto the_end;
512
            ret = qemu_paio_error(&acb->aiocb);
513
            if (ret == ECANCELED) {
514
                /* remove the request */
515
                *pacb = acb->next;
516
                qemu_aio_release(acb);
517
            } else if (ret != EINPROGRESS) {
518
                /* end of aio */
519
                if (ret == 0) {
520
                    ret = qemu_paio_return(&acb->aiocb);
521
                    if (ret == acb->aiocb.aio_nbytes)
522
                        ret = 0;
523
                    else
524
                        ret = -EINVAL;
525
                } else {
526
                    ret = -ret;
527
                }
528
                /* remove the request */
529
                *pacb = acb->next;
530
                /* call the callback */
531
                acb->common.cb(acb->common.opaque, ret);
532
                qemu_aio_release(acb);
533
                break;
534
            } else {
535
                pacb = &acb->next;
536
            }
537
        }
538
    }
539
 the_end: ;
540
}
541

    
542
static int posix_aio_flush(void *opaque)
543
{
544
    PosixAioState *s = opaque;
545
    return !!s->first_aio;
546
}
547

    
548
static PosixAioState *posix_aio_state;
549

    
550
static void aio_signal_handler(int signum)
551
{
552
    if (posix_aio_state) {
553
        char byte = 0;
554

    
555
        write(posix_aio_state->wfd, &byte, sizeof(byte));
556
    }
557

    
558
    qemu_service_io();
559
}
560

    
561
static int posix_aio_init(void)
562
{
563
    struct sigaction act;
564
    PosixAioState *s;
565
    int fds[2];
566
    struct qemu_paioinit ai;
567
  
568
    if (posix_aio_state)
569
        return 0;
570

    
571
    s = qemu_malloc(sizeof(PosixAioState));
572

    
573
    sigfillset(&act.sa_mask);
574
    act.sa_flags = 0; /* do not restart syscalls to interrupt select() */
575
    act.sa_handler = aio_signal_handler;
576
    sigaction(SIGUSR2, &act, NULL);
577

    
578
    s->first_aio = NULL;
579
    if (pipe(fds) == -1) {
580
        fprintf(stderr, "failed to create pipe\n");
581
        return -errno;
582
    }
583

    
584
    s->rfd = fds[0];
585
    s->wfd = fds[1];
586

    
587
    fcntl(s->rfd, F_SETFL, O_NONBLOCK);
588
    fcntl(s->wfd, F_SETFL, O_NONBLOCK);
589

    
590
    qemu_aio_set_fd_handler(s->rfd, posix_aio_read, NULL, posix_aio_flush, s);
591

    
592
    memset(&ai, 0, sizeof(ai));
593
    ai.aio_threads = 64;
594
    ai.aio_num = 64;
595
    qemu_paio_init(&ai);
596

    
597
    posix_aio_state = s;
598

    
599
    return 0;
600
}
601

    
602
static RawAIOCB *raw_aio_setup(BlockDriverState *bs,
603
        int64_t sector_num, uint8_t *buf, int nb_sectors,
604
        BlockDriverCompletionFunc *cb, void *opaque)
605
{
606
    BDRVRawState *s = bs->opaque;
607
    RawAIOCB *acb;
608

    
609
    if (fd_open(bs) < 0)
610
        return NULL;
611

    
612
    acb = qemu_aio_get(bs, cb, opaque);
613
    if (!acb)
614
        return NULL;
615
    acb->aiocb.aio_fildes = s->fd;
616
    acb->aiocb.ev_signo = SIGUSR2;
617
    acb->aiocb.aio_buf = buf;
618
    if (nb_sectors < 0)
619
        acb->aiocb.aio_nbytes = -nb_sectors;
620
    else
621
        acb->aiocb.aio_nbytes = nb_sectors * 512;
622
    acb->aiocb.aio_offset = sector_num * 512;
623
    acb->next = posix_aio_state->first_aio;
624
    posix_aio_state->first_aio = acb;
625
    return acb;
626
}
627

    
628
static void raw_aio_em_cb(void* opaque)
629
{
630
    RawAIOCB *acb = opaque;
631
    acb->common.cb(acb->common.opaque, acb->ret);
632
    qemu_aio_release(acb);
633
}
634

    
635
static void raw_aio_remove(RawAIOCB *acb)
636
{
637
    RawAIOCB **pacb;
638

    
639
    /* remove the callback from the queue */
640
    pacb = &posix_aio_state->first_aio;
641
    for(;;) {
642
        if (*pacb == NULL) {
643
            fprintf(stderr, "raw_aio_remove: aio request not found!\n");
644
            break;
645
        } else if (*pacb == acb) {
646
            *pacb = acb->next;
647
            qemu_aio_release(acb);
648
            break;
649
        }
650
        pacb = &(*pacb)->next;
651
    }
652
}
653

    
654
static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
655
        int64_t sector_num, uint8_t *buf, int nb_sectors,
656
        BlockDriverCompletionFunc *cb, void *opaque)
657
{
658
    RawAIOCB *acb;
659

    
660
    /*
661
     * If O_DIRECT is used and the buffer is not aligned fall back
662
     * to synchronous IO.
663
     */
664
    BDRVRawState *s = bs->opaque;
665

    
666
    if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
667
        QEMUBH *bh;
668
        acb = qemu_aio_get(bs, cb, opaque);
669
        acb->ret = raw_pread(bs, 512 * sector_num, buf, 512 * nb_sectors);
670
        bh = qemu_bh_new(raw_aio_em_cb, acb);
671
        qemu_bh_schedule(bh);
672
        return &acb->common;
673
    }
674

    
675
    acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
676
    if (!acb)
677
        return NULL;
678
    if (qemu_paio_read(&acb->aiocb) < 0) {
679
        raw_aio_remove(acb);
680
        return NULL;
681
    }
682
    return &acb->common;
683
}
684

    
685
static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs,
686
        int64_t sector_num, const uint8_t *buf, int nb_sectors,
687
        BlockDriverCompletionFunc *cb, void *opaque)
688
{
689
    RawAIOCB *acb;
690

    
691
    /*
692
     * If O_DIRECT is used and the buffer is not aligned fall back
693
     * to synchronous IO.
694
     */
695
    BDRVRawState *s = bs->opaque;
696

    
697
    if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
698
        QEMUBH *bh;
699
        acb = qemu_aio_get(bs, cb, opaque);
700
        acb->ret = raw_pwrite(bs, 512 * sector_num, buf, 512 * nb_sectors);
701
        bh = qemu_bh_new(raw_aio_em_cb, acb);
702
        qemu_bh_schedule(bh);
703
        return &acb->common;
704
    }
705

    
706
    acb = raw_aio_setup(bs, sector_num, (uint8_t*)buf, nb_sectors, cb, opaque);
707
    if (!acb)
708
        return NULL;
709
    if (qemu_paio_write(&acb->aiocb) < 0) {
710
        raw_aio_remove(acb);
711
        return NULL;
712
    }
713
    return &acb->common;
714
}
715

    
716
static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
717
{
718
    int ret;
719
    RawAIOCB *acb = (RawAIOCB *)blockacb;
720

    
721
    ret = qemu_paio_cancel(acb->aiocb.aio_fildes, &acb->aiocb);
722
    if (ret == QEMU_PAIO_NOTCANCELED) {
723
        /* fail safe: if the aio could not be canceled, we wait for
724
           it */
725
        while (qemu_paio_error(&acb->aiocb) == EINPROGRESS);
726
    }
727

    
728
    raw_aio_remove(acb);
729
}
730
#else /* CONFIG_AIO */
731
static int posix_aio_init(void)
732
{
733
    return 0;
734
}
735
#endif /* CONFIG_AIO */
736

    
737

    
738
static void raw_close(BlockDriverState *bs)
739
{
740
    BDRVRawState *s = bs->opaque;
741
    if (s->fd >= 0) {
742
        close(s->fd);
743
        s->fd = -1;
744
        if (s->aligned_buf != NULL)
745
            qemu_free(s->aligned_buf);
746
    }
747
}
748

    
749
static int raw_truncate(BlockDriverState *bs, int64_t offset)
750
{
751
    BDRVRawState *s = bs->opaque;
752
    if (s->type != FTYPE_FILE)
753
        return -ENOTSUP;
754
    if (ftruncate(s->fd, offset) < 0)
755
        return -errno;
756
    return 0;
757
}
758

    
759
#ifdef __OpenBSD__
760
static int64_t raw_getlength(BlockDriverState *bs)
761
{
762
    BDRVRawState *s = bs->opaque;
763
    int fd = s->fd;
764
    struct stat st;
765

    
766
    if (fstat(fd, &st))
767
        return -1;
768
    if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
769
        struct disklabel dl;
770

    
771
        if (ioctl(fd, DIOCGDINFO, &dl))
772
            return -1;
773
        return (uint64_t)dl.d_secsize *
774
            dl.d_partitions[DISKPART(st.st_rdev)].p_size;
775
    } else
776
        return st.st_size;
777
}
778
#else /* !__OpenBSD__ */
779
static int64_t  raw_getlength(BlockDriverState *bs)
780
{
781
    BDRVRawState *s = bs->opaque;
782
    int fd = s->fd;
783
    int64_t size;
784
#ifdef HOST_BSD
785
    struct stat sb;
786
#ifdef __FreeBSD__
787
    int reopened = 0;
788
#endif
789
#endif
790
#ifdef __sun__
791
    struct dk_minfo minfo;
792
    int rv;
793
#endif
794
    int ret;
795

    
796
    ret = fd_open(bs);
797
    if (ret < 0)
798
        return ret;
799

    
800
#ifdef HOST_BSD
801
#ifdef __FreeBSD__
802
again:
803
#endif
804
    if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
805
#ifdef DIOCGMEDIASIZE
806
        if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
807
#elif defined(DIOCGPART)
808
        {
809
                struct partinfo pi;
810
                if (ioctl(fd, DIOCGPART, &pi) == 0)
811
                        size = pi.media_size;
812
                else
813
                        size = 0;
814
        }
815
        if (size == 0)
816
#endif
817
#ifdef CONFIG_COCOA
818
        size = LONG_LONG_MAX;
819
#else
820
        size = lseek(fd, 0LL, SEEK_END);
821
#endif
822
#ifdef __FreeBSD__
823
        switch(s->type) {
824
        case FTYPE_CD:
825
            /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
826
            if (size == 2048LL * (unsigned)-1)
827
                size = 0;
828
            /* XXX no disc?  maybe we need to reopen... */
829
            if (size <= 0 && !reopened && cd_open(bs) >= 0) {
830
                reopened = 1;
831
                goto again;
832
            }
833
        }
834
#endif
835
    } else
836
#endif
837
#ifdef __sun__
838
    /*
839
     * use the DKIOCGMEDIAINFO ioctl to read the size.
840
     */
841
    rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
842
    if ( rv != -1 ) {
843
        size = minfo.dki_lbsize * minfo.dki_capacity;
844
    } else /* there are reports that lseek on some devices
845
              fails, but irc discussion said that contingency
846
              on contingency was overkill */
847
#endif
848
    {
849
        size = lseek(fd, 0, SEEK_END);
850
    }
851
    return size;
852
}
853
#endif
854

    
855
static int raw_create(const char *filename, int64_t total_size,
856
                      const char *backing_file, int flags)
857
{
858
    int fd;
859

    
860
    if (flags || backing_file)
861
        return -ENOTSUP;
862

    
863
    fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
864
              0644);
865
    if (fd < 0)
866
        return -EIO;
867
    ftruncate(fd, total_size * 512);
868
    close(fd);
869
    return 0;
870
}
871

    
872
static void raw_flush(BlockDriverState *bs)
873
{
874
    BDRVRawState *s = bs->opaque;
875
    fsync(s->fd);
876
}
877

    
878
BlockDriver bdrv_raw = {
879
    .format_name = "raw",
880
    .instance_size = sizeof(BDRVRawState),
881
    .bdrv_probe = NULL, /* no probe for protocols */
882
    .bdrv_open = raw_open,
883
    .bdrv_read = raw_read,
884
    .bdrv_write = raw_write,
885
    .bdrv_close = raw_close,
886
    .bdrv_create = raw_create,
887
    .bdrv_flush = raw_flush,
888

    
889
#ifdef CONFIG_AIO
890
    .bdrv_aio_read = raw_aio_read,
891
    .bdrv_aio_write = raw_aio_write,
892
    .bdrv_aio_cancel = raw_aio_cancel,
893
    .aiocb_size = sizeof(RawAIOCB),
894
#endif
895

    
896
    .bdrv_truncate = raw_truncate,
897
    .bdrv_getlength = raw_getlength,
898
};
899

    
900
/***********************************************/
901
/* host device */
902

    
903
#ifdef CONFIG_COCOA
904
static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
905
static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
906

    
907
kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
908
{
909
    kern_return_t       kernResult;
910
    mach_port_t     masterPort;
911
    CFMutableDictionaryRef  classesToMatch;
912

    
913
    kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
914
    if ( KERN_SUCCESS != kernResult ) {
915
        printf( "IOMasterPort returned %d\n", kernResult );
916
    }
917

    
918
    classesToMatch = IOServiceMatching( kIOCDMediaClass );
919
    if ( classesToMatch == NULL ) {
920
        printf( "IOServiceMatching returned a NULL dictionary.\n" );
921
    } else {
922
    CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
923
    }
924
    kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
925
    if ( KERN_SUCCESS != kernResult )
926
    {
927
        printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
928
    }
929

    
930
    return kernResult;
931
}
932

    
933
kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
934
{
935
    io_object_t     nextMedia;
936
    kern_return_t   kernResult = KERN_FAILURE;
937
    *bsdPath = '\0';
938
    nextMedia = IOIteratorNext( mediaIterator );
939
    if ( nextMedia )
940
    {
941
        CFTypeRef   bsdPathAsCFString;
942
    bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
943
        if ( bsdPathAsCFString ) {
944
            size_t devPathLength;
945
            strcpy( bsdPath, _PATH_DEV );
946
            strcat( bsdPath, "r" );
947
            devPathLength = strlen( bsdPath );
948
            if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
949
                kernResult = KERN_SUCCESS;
950
            }
951
            CFRelease( bsdPathAsCFString );
952
        }
953
        IOObjectRelease( nextMedia );
954
    }
955

    
956
    return kernResult;
957
}
958

    
959
#endif
960

    
961
static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
962
{
963
    BDRVRawState *s = bs->opaque;
964
    int fd, open_flags, ret;
965

    
966
    posix_aio_init();
967

    
968
#ifdef CONFIG_COCOA
969
    if (strstart(filename, "/dev/cdrom", NULL)) {
970
        kern_return_t kernResult;
971
        io_iterator_t mediaIterator;
972
        char bsdPath[ MAXPATHLEN ];
973
        int fd;
974

    
975
        kernResult = FindEjectableCDMedia( &mediaIterator );
976
        kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
977

    
978
        if ( bsdPath[ 0 ] != '\0' ) {
979
            strcat(bsdPath,"s0");
980
            /* some CDs don't have a partition 0 */
981
            fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
982
            if (fd < 0) {
983
                bsdPath[strlen(bsdPath)-1] = '1';
984
            } else {
985
                close(fd);
986
            }
987
            filename = bsdPath;
988
        }
989

    
990
        if ( mediaIterator )
991
            IOObjectRelease( mediaIterator );
992
    }
993
#endif
994
    open_flags = O_BINARY;
995
    if ((flags & BDRV_O_ACCESS) == O_RDWR) {
996
        open_flags |= O_RDWR;
997
    } else {
998
        open_flags |= O_RDONLY;
999
        bs->read_only = 1;
1000
    }
1001
    /* Use O_DSYNC for write-through caching, no flags for write-back caching,
1002
     * and O_DIRECT for no caching. */
1003
    if ((flags & BDRV_O_NOCACHE))
1004
        open_flags |= O_DIRECT;
1005
    else if (!(flags & BDRV_O_CACHE_WB))
1006
        open_flags |= O_DSYNC;
1007

    
1008
    s->type = FTYPE_FILE;
1009
#if defined(__linux__)
1010
    if (strstart(filename, "/dev/cd", NULL)) {
1011
        /* open will not fail even if no CD is inserted */
1012
        open_flags |= O_NONBLOCK;
1013
        s->type = FTYPE_CD;
1014
    } else if (strstart(filename, "/dev/fd", NULL)) {
1015
        s->type = FTYPE_FD;
1016
        s->fd_open_flags = open_flags;
1017
        /* open will not fail even if no floppy is inserted */
1018
        open_flags |= O_NONBLOCK;
1019
#ifdef CONFIG_AIO
1020
    } else if (strstart(filename, "/dev/sg", NULL)) {
1021
        bs->sg = 1;
1022
#endif
1023
    }
1024
#endif
1025
#if defined(__FreeBSD__)
1026
    if (strstart(filename, "/dev/cd", NULL) ||
1027
        strstart(filename, "/dev/acd", NULL)) {
1028
        s->type = FTYPE_CD;
1029
        s->cd_open_flags = open_flags;
1030
    }
1031
#endif
1032
    s->fd = -1;
1033
    fd = open(filename, open_flags, 0644);
1034
    if (fd < 0) {
1035
        ret = -errno;
1036
        if (ret == -EROFS)
1037
            ret = -EACCES;
1038
        return ret;
1039
    }
1040
    s->fd = fd;
1041
#if defined(__FreeBSD__)
1042
    /* make sure the door isnt locked at this time */
1043
    if (s->type == FTYPE_CD)
1044
        ioctl (s->fd, CDIOCALLOW);
1045
#endif
1046
#if defined(__linux__)
1047
    /* close fd so that we can reopen it as needed */
1048
    if (s->type == FTYPE_FD) {
1049
        close(s->fd);
1050
        s->fd = -1;
1051
        s->fd_media_changed = 1;
1052
    }
1053
#endif
1054
    return 0;
1055
}
1056

    
1057
#if defined(__linux__)
1058
/* Note: we do not have a reliable method to detect if the floppy is
1059
   present. The current method is to try to open the floppy at every
1060
   I/O and to keep it opened during a few hundreds of ms. */
1061
static int fd_open(BlockDriverState *bs)
1062
{
1063
    BDRVRawState *s = bs->opaque;
1064
    int last_media_present;
1065

    
1066
    if (s->type != FTYPE_FD)
1067
        return 0;
1068
    last_media_present = (s->fd >= 0);
1069
    if (s->fd >= 0 &&
1070
        (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
1071
        close(s->fd);
1072
        s->fd = -1;
1073
#ifdef DEBUG_FLOPPY
1074
        printf("Floppy closed\n");
1075
#endif
1076
    }
1077
    if (s->fd < 0) {
1078
        if (s->fd_got_error &&
1079
            (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
1080
#ifdef DEBUG_FLOPPY
1081
            printf("No floppy (open delayed)\n");
1082
#endif
1083
            return -EIO;
1084
        }
1085
        s->fd = open(bs->filename, s->fd_open_flags);
1086
        if (s->fd < 0) {
1087
            s->fd_error_time = qemu_get_clock(rt_clock);
1088
            s->fd_got_error = 1;
1089
            if (last_media_present)
1090
                s->fd_media_changed = 1;
1091
#ifdef DEBUG_FLOPPY
1092
            printf("No floppy\n");
1093
#endif
1094
            return -EIO;
1095
        }
1096
#ifdef DEBUG_FLOPPY
1097
        printf("Floppy opened\n");
1098
#endif
1099
    }
1100
    if (!last_media_present)
1101
        s->fd_media_changed = 1;
1102
    s->fd_open_time = qemu_get_clock(rt_clock);
1103
    s->fd_got_error = 0;
1104
    return 0;
1105
}
1106

    
1107
static int raw_is_inserted(BlockDriverState *bs)
1108
{
1109
    BDRVRawState *s = bs->opaque;
1110
    int ret;
1111

    
1112
    switch(s->type) {
1113
    case FTYPE_CD:
1114
        ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1115
        if (ret == CDS_DISC_OK)
1116
            return 1;
1117
        else
1118
            return 0;
1119
        break;
1120
    case FTYPE_FD:
1121
        ret = fd_open(bs);
1122
        return (ret >= 0);
1123
    default:
1124
        return 1;
1125
    }
1126
}
1127

    
1128
/* currently only used by fdc.c, but a CD version would be good too */
1129
static int raw_media_changed(BlockDriverState *bs)
1130
{
1131
    BDRVRawState *s = bs->opaque;
1132

    
1133
    switch(s->type) {
1134
    case FTYPE_FD:
1135
        {
1136
            int ret;
1137
            /* XXX: we do not have a true media changed indication. It
1138
               does not work if the floppy is changed without trying
1139
               to read it */
1140
            fd_open(bs);
1141
            ret = s->fd_media_changed;
1142
            s->fd_media_changed = 0;
1143
#ifdef DEBUG_FLOPPY
1144
            printf("Floppy changed=%d\n", ret);
1145
#endif
1146
            return ret;
1147
        }
1148
    default:
1149
        return -ENOTSUP;
1150
    }
1151
}
1152

    
1153
static int raw_eject(BlockDriverState *bs, int eject_flag)
1154
{
1155
    BDRVRawState *s = bs->opaque;
1156

    
1157
    switch(s->type) {
1158
    case FTYPE_CD:
1159
        if (eject_flag) {
1160
            if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
1161
                perror("CDROMEJECT");
1162
        } else {
1163
            if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
1164
                perror("CDROMEJECT");
1165
        }
1166
        break;
1167
    case FTYPE_FD:
1168
        {
1169
            int fd;
1170
            if (s->fd >= 0) {
1171
                close(s->fd);
1172
                s->fd = -1;
1173
            }
1174
            fd = open(bs->filename, s->fd_open_flags | O_NONBLOCK);
1175
            if (fd >= 0) {
1176
                if (ioctl(fd, FDEJECT, 0) < 0)
1177
                    perror("FDEJECT");
1178
                close(fd);
1179
            }
1180
        }
1181
        break;
1182
    default:
1183
        return -ENOTSUP;
1184
    }
1185
    return 0;
1186
}
1187

    
1188
static int raw_set_locked(BlockDriverState *bs, int locked)
1189
{
1190
    BDRVRawState *s = bs->opaque;
1191

    
1192
    switch(s->type) {
1193
    case FTYPE_CD:
1194
        if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
1195
            /* Note: an error can happen if the distribution automatically
1196
               mounts the CD-ROM */
1197
            //        perror("CDROM_LOCKDOOR");
1198
        }
1199
        break;
1200
    default:
1201
        return -ENOTSUP;
1202
    }
1203
    return 0;
1204
}
1205

    
1206
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1207
{
1208
    BDRVRawState *s = bs->opaque;
1209

    
1210
    return ioctl(s->fd, req, buf);
1211
}
1212

    
1213
#ifdef CONFIG_AIO
1214
static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
1215
        unsigned long int req, void *buf,
1216
        BlockDriverCompletionFunc *cb, void *opaque)
1217
{
1218
    RawAIOCB *acb;
1219

    
1220
    acb = raw_aio_setup(bs, 0, buf, 0, cb, opaque);
1221
    if (!acb)
1222
        return NULL;
1223

    
1224
    acb->aiocb.aio_ioctl_cmd = req;
1225
    if (qemu_paio_ioctl(&acb->aiocb) < 0) {
1226
        raw_aio_remove(acb);
1227
        return NULL;
1228
    }
1229

    
1230
    return &acb->common;
1231
}
1232
#endif
1233

    
1234
#elif defined(__FreeBSD__)
1235

    
1236
static int fd_open(BlockDriverState *bs)
1237
{
1238
    BDRVRawState *s = bs->opaque;
1239

    
1240
    /* this is just to ensure s->fd is sane (its called by io ops) */
1241
    if (s->fd >= 0)
1242
        return 0;
1243
    return -EIO;
1244
}
1245

    
1246
static int cd_open(BlockDriverState *bs)
1247
{
1248
#if defined(__FreeBSD__)
1249
    BDRVRawState *s = bs->opaque;
1250
    int fd;
1251

    
1252
    switch(s->type) {
1253
    case FTYPE_CD:
1254
        /* XXX force reread of possibly changed/newly loaded disc,
1255
         * FreeBSD seems to not notice sometimes... */
1256
        if (s->fd >= 0)
1257
            close (s->fd);
1258
        fd = open(bs->filename, s->cd_open_flags, 0644);
1259
        if (fd < 0) {
1260
            s->fd = -1;
1261
            return -EIO;
1262
        }
1263
        s->fd = fd;
1264
        /* make sure the door isnt locked at this time */
1265
        ioctl (s->fd, CDIOCALLOW);
1266
    }
1267
#endif
1268
    return 0;
1269
}
1270

    
1271
static int raw_is_inserted(BlockDriverState *bs)
1272
{
1273
    BDRVRawState *s = bs->opaque;
1274

    
1275
    switch(s->type) {
1276
    case FTYPE_CD:
1277
        return (raw_getlength(bs) > 0);
1278
    case FTYPE_FD:
1279
        /* XXX handle this */
1280
        /* FALLTHRU */
1281
    default:
1282
        return 1;
1283
    }
1284
}
1285

    
1286
static int raw_media_changed(BlockDriverState *bs)
1287
{
1288
    return -ENOTSUP;
1289
}
1290

    
1291
static int raw_eject(BlockDriverState *bs, int eject_flag)
1292
{
1293
    BDRVRawState *s = bs->opaque;
1294

    
1295
    switch(s->type) {
1296
    case FTYPE_CD:
1297
        if (s->fd < 0)
1298
            return -ENOTSUP;
1299
        (void) ioctl (s->fd, CDIOCALLOW);
1300
        if (eject_flag) {
1301
            if (ioctl (s->fd, CDIOCEJECT) < 0)
1302
                perror("CDIOCEJECT");
1303
        } else {
1304
            if (ioctl (s->fd, CDIOCCLOSE) < 0)
1305
                perror("CDIOCCLOSE");
1306
        }
1307
        if (cd_open(bs) < 0)
1308
            return -ENOTSUP;
1309
        break;
1310
    case FTYPE_FD:
1311
        /* XXX handle this */
1312
        /* FALLTHRU */
1313
    default:
1314
        return -ENOTSUP;
1315
    }
1316
    return 0;
1317
}
1318

    
1319
static int raw_set_locked(BlockDriverState *bs, int locked)
1320
{
1321
    BDRVRawState *s = bs->opaque;
1322

    
1323
    switch(s->type) {
1324
    case FTYPE_CD:
1325
        if (s->fd < 0)
1326
            return -ENOTSUP;
1327
        if (ioctl (s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
1328
            /* Note: an error can happen if the distribution automatically
1329
               mounts the CD-ROM */
1330
            //        perror("CDROM_LOCKDOOR");
1331
        }
1332
        break;
1333
    default:
1334
        return -ENOTSUP;
1335
    }
1336
    return 0;
1337
}
1338

    
1339
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1340
{
1341
    return -ENOTSUP;
1342
}
1343
#else /* !linux && !FreeBSD */
1344

    
1345
static int fd_open(BlockDriverState *bs)
1346
{
1347
    return 0;
1348
}
1349

    
1350
static int raw_is_inserted(BlockDriverState *bs)
1351
{
1352
    return 1;
1353
}
1354

    
1355
static int raw_media_changed(BlockDriverState *bs)
1356
{
1357
    return -ENOTSUP;
1358
}
1359

    
1360
static int raw_eject(BlockDriverState *bs, int eject_flag)
1361
{
1362
    return -ENOTSUP;
1363
}
1364

    
1365
static int raw_set_locked(BlockDriverState *bs, int locked)
1366
{
1367
    return -ENOTSUP;
1368
}
1369

    
1370
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1371
{
1372
    return -ENOTSUP;
1373
}
1374

    
1375
static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
1376
        unsigned long int req, void *buf,
1377
        BlockDriverCompletionFunc *cb, void *opaque)
1378
{
1379
    return NULL;
1380
}
1381
#endif /* !linux && !FreeBSD */
1382

    
1383
#if defined(__linux__) || defined(__FreeBSD__)
1384
static int hdev_create(const char *filename, int64_t total_size,
1385
                       const char *backing_file, int flags)
1386
{
1387
    int fd;
1388
    int ret = 0;
1389
    struct stat stat_buf;
1390

    
1391
    if (flags || backing_file)
1392
        return -ENOTSUP;
1393

    
1394
    fd = open(filename, O_WRONLY | O_BINARY);
1395
    if (fd < 0)
1396
        return -EIO;
1397

    
1398
    if (fstat(fd, &stat_buf) < 0)
1399
        ret = -EIO;
1400
    else if (!S_ISBLK(stat_buf.st_mode))
1401
        ret = -EIO;
1402
    else if (lseek(fd, 0, SEEK_END) < total_size * 512)
1403
        ret = -ENOSPC;
1404

    
1405
    close(fd);
1406
    return ret;
1407
}
1408

    
1409
#else  /* !(linux || freebsd) */
1410

    
1411
static int hdev_create(const char *filename, int64_t total_size,
1412
                       const char *backing_file, int flags)
1413
{
1414
    return -ENOTSUP;
1415
}
1416
#endif
1417

    
1418
BlockDriver bdrv_host_device = {
1419
    .format_name        = "host_device",
1420
    .instance_size        = sizeof(BDRVRawState),
1421
    .bdrv_open                = hdev_open,
1422
    .bdrv_close                = raw_close,
1423
    .bdrv_create        = hdev_create,
1424
    .bdrv_flush                = raw_flush,
1425

    
1426
#ifdef CONFIG_AIO
1427
    .bdrv_aio_read        = raw_aio_read,
1428
    .bdrv_aio_write        = raw_aio_write,
1429
    .bdrv_aio_cancel        = raw_aio_cancel,
1430
    .aiocb_size                = sizeof(RawAIOCB),
1431
#endif
1432

    
1433
    .bdrv_read          = raw_read,
1434
    .bdrv_write         = raw_write,
1435
    .bdrv_getlength        = raw_getlength,
1436

    
1437
    /* removable device support */
1438
    .bdrv_is_inserted        = raw_is_inserted,
1439
    .bdrv_media_changed        = raw_media_changed,
1440
    .bdrv_eject                = raw_eject,
1441
    .bdrv_set_locked        = raw_set_locked,
1442
    /* generic scsi device */
1443
    .bdrv_ioctl                = raw_ioctl,
1444
#ifdef CONFIG_AIO
1445
    .bdrv_aio_ioctl        = raw_aio_ioctl,
1446
#endif
1447
};