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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
#if !defined(QEMU_IMG) && !defined(QEMU_NBD)
26
#include "qemu-timer.h"
27
#include "exec-all.h"
28
#endif
29
#include "block_int.h"
30
#include <assert.h>
31
#ifdef CONFIG_AIO
32
#include <aio.h>
33
#endif
34

    
35
#ifdef CONFIG_COCOA
36
#include <paths.h>
37
#include <sys/param.h>
38
#include <IOKit/IOKitLib.h>
39
#include <IOKit/IOBSD.h>
40
#include <IOKit/storage/IOMediaBSDClient.h>
41
#include <IOKit/storage/IOMedia.h>
42
#include <IOKit/storage/IOCDMedia.h>
43
//#include <IOKit/storage/IOCDTypes.h>
44
#include <CoreFoundation/CoreFoundation.h>
45
#endif
46

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

    
61
//#define DEBUG_FLOPPY
62

    
63
//#define DEBUG_BLOCK
64
#if defined(DEBUG_BLOCK) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
65
#define DEBUG_BLOCK_PRINT(formatCstr, args...) do { if (loglevel != 0)        \
66
    { fprintf(logfile, formatCstr, ##args); fflush(logfile); } } while (0)
67
#else
68
#define DEBUG_BLOCK_PRINT(formatCstr, args...)
69
#endif
70

    
71
#define FTYPE_FILE   0
72
#define FTYPE_CD     1
73
#define FTYPE_FD     2
74

    
75
#define ALIGNED_BUFFER_SIZE (32 * 512)
76

    
77
/* if the FD is not accessed during that time (in ms), we try to
78
   reopen it to see if the disk has been changed */
79
#define FD_OPEN_TIMEOUT 1000
80

    
81
typedef struct BDRVRawState {
82
    int fd;
83
    int type;
84
    unsigned int lseek_err_cnt;
85
#if defined(__linux__)
86
    /* linux floppy specific */
87
    int fd_open_flags;
88
    int64_t fd_open_time;
89
    int64_t fd_error_time;
90
    int fd_got_error;
91
    int fd_media_changed;
92
#endif
93
#if defined(O_DIRECT) && !defined(QEMU_IMG)
94
    uint8_t* aligned_buf;
95
#endif
96
} BDRVRawState;
97

    
98
static int fd_open(BlockDriverState *bs);
99

    
100
static int raw_open(BlockDriverState *bs, const char *filename, int flags)
101
{
102
    BDRVRawState *s = bs->opaque;
103
    int fd, open_flags, ret;
104

    
105
    s->lseek_err_cnt = 0;
106

    
107
    open_flags = O_BINARY;
108
    if ((flags & BDRV_O_ACCESS) == O_RDWR) {
109
        open_flags |= O_RDWR;
110
    } else {
111
        open_flags |= O_RDONLY;
112
        bs->read_only = 1;
113
    }
114
    if (flags & BDRV_O_CREAT)
115
        open_flags |= O_CREAT | O_TRUNC;
116
#ifdef O_DIRECT
117
    if (flags & BDRV_O_DIRECT)
118
        open_flags |= O_DIRECT;
119
#endif
120

    
121
    s->type = FTYPE_FILE;
122

    
123
    fd = open(filename, open_flags, 0644);
124
    if (fd < 0) {
125
        ret = -errno;
126
        if (ret == -EROFS)
127
            ret = -EACCES;
128
        return ret;
129
    }
130
    s->fd = fd;
131
#if defined(O_DIRECT) && !defined(QEMU_IMG)
132
    s->aligned_buf = NULL;
133
    if (flags & BDRV_O_DIRECT) {
134
        s->aligned_buf = qemu_memalign(512, ALIGNED_BUFFER_SIZE);
135
        if (s->aligned_buf == NULL) {
136
            ret = -errno;
137
            close(fd);
138
            return ret;
139
        }
140
    }
141
#endif
142
    return 0;
143
}
144

    
145
/* XXX: use host sector size if necessary with:
146
#ifdef DIOCGSECTORSIZE
147
        {
148
            unsigned int sectorsize = 512;
149
            if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
150
                sectorsize > bufsize)
151
                bufsize = sectorsize;
152
        }
153
#endif
154
#ifdef CONFIG_COCOA
155
        u_int32_t   blockSize = 512;
156
        if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
157
            bufsize = blockSize;
158
        }
159
#endif
160
*/
161

    
162
/*
163
 * offset and count are in bytes, but must be multiples of 512 for files
164
 * opened with O_DIRECT. buf must be aligned to 512 bytes then.
165
 *
166
 * This function may be called without alignment if the caller ensures
167
 * that O_DIRECT is not in effect.
168
 */
169
static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
170
                     uint8_t *buf, int count)
171
{
172
    BDRVRawState *s = bs->opaque;
173
    int ret;
174

    
175
    ret = fd_open(bs);
176
    if (ret < 0)
177
        return ret;
178

    
179
    if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
180
        ++(s->lseek_err_cnt);
181
        if(s->lseek_err_cnt <= 10) {
182
            DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
183
                              "] lseek failed : %d = %s\n",
184
                              s->fd, bs->filename, offset, buf, count,
185
                              bs->total_sectors, errno, strerror(errno));
186
        }
187
        return -1;
188
    }
189
    s->lseek_err_cnt=0;
190

    
191
    ret = read(s->fd, buf, count);
192
    if (ret == count)
193
        goto label__raw_read__success;
194

    
195
    DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
196
                      "] read failed %d : %d = %s\n",
197
                      s->fd, bs->filename, offset, buf, count,
198
                      bs->total_sectors, ret, errno, strerror(errno));
199

    
200
    /* Try harder for CDrom. */
201
    if (bs->type == BDRV_TYPE_CDROM) {
202
        lseek(s->fd, offset, SEEK_SET);
203
        ret = read(s->fd, buf, count);
204
        if (ret == count)
205
            goto label__raw_read__success;
206
        lseek(s->fd, offset, SEEK_SET);
207
        ret = read(s->fd, buf, count);
208
        if (ret == count)
209
            goto label__raw_read__success;
210

    
211
        DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
212
                          "] retry read failed %d : %d = %s\n",
213
                          s->fd, bs->filename, offset, buf, count,
214
                          bs->total_sectors, ret, errno, strerror(errno));
215
    }
216

    
217
label__raw_read__success:
218

    
219
    return ret;
220
}
221

    
222
/*
223
 * offset and count are in bytes, but must be multiples of 512 for files
224
 * opened with O_DIRECT. buf must be aligned to 512 bytes then.
225
 *
226
 * This function may be called without alignment if the caller ensures
227
 * that O_DIRECT is not in effect.
228
 */
229
static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
230
                      const uint8_t *buf, int count)
231
{
232
    BDRVRawState *s = bs->opaque;
233
    int ret;
234

    
235
    ret = fd_open(bs);
236
    if (ret < 0)
237
        return ret;
238

    
239
    if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
240
        ++(s->lseek_err_cnt);
241
        if(s->lseek_err_cnt) {
242
            DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%"
243
                              PRId64 "] lseek failed : %d = %s\n",
244
                              s->fd, bs->filename, offset, buf, count,
245
                              bs->total_sectors, errno, strerror(errno));
246
        }
247
        return -1;
248
    }
249
    s->lseek_err_cnt = 0;
250

    
251
    ret = write(s->fd, buf, count);
252
    if (ret == count)
253
        goto label__raw_write__success;
254

    
255
    DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
256
                      "] write failed %d : %d = %s\n",
257
                      s->fd, bs->filename, offset, buf, count,
258
                      bs->total_sectors, ret, errno, strerror(errno));
259

    
260
label__raw_write__success:
261

    
262
    return ret;
263
}
264

    
265

    
266
#if defined(O_DIRECT) && !defined(QEMU_IMG)
267
/*
268
 * offset and count are in bytes and possibly not aligned. For files opened
269
 * with O_DIRECT, necessary alignments are ensured before calling
270
 * raw_pread_aligned to do the actual read.
271
 */
272
static int raw_pread(BlockDriverState *bs, int64_t offset,
273
                     uint8_t *buf, int count)
274
{
275
    BDRVRawState *s = bs->opaque;
276
    int size, ret, shift, sum;
277

    
278
    sum = 0;
279

    
280
    if (s->aligned_buf != NULL)  {
281

    
282
        if (offset & 0x1ff) {
283
            /* align offset on a 512 bytes boundary */
284

    
285
            shift = offset & 0x1ff;
286
            size = (shift + count + 0x1ff) & ~0x1ff;
287
            if (size > ALIGNED_BUFFER_SIZE)
288
                size = ALIGNED_BUFFER_SIZE;
289
            ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size);
290
            if (ret < 0)
291
                return ret;
292

    
293
            size = 512 - shift;
294
            if (size > count)
295
                size = count;
296
            memcpy(buf, s->aligned_buf + shift, size);
297

    
298
            buf += size;
299
            offset += size;
300
            count -= size;
301
            sum += size;
302

    
303
            if (count == 0)
304
                return sum;
305
        }
306
        if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
307

    
308
            /* read on aligned buffer */
309

    
310
            while (count) {
311

    
312
                size = (count + 0x1ff) & ~0x1ff;
313
                if (size > ALIGNED_BUFFER_SIZE)
314
                    size = ALIGNED_BUFFER_SIZE;
315

    
316
                ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
317
                if (ret < 0)
318
                    return ret;
319

    
320
                size = ret;
321
                if (size > count)
322
                    size = count;
323

    
324
                memcpy(buf, s->aligned_buf, size);
325

    
326
                buf += size;
327
                offset += size;
328
                count -= size;
329
                sum += size;
330
            }
331

    
332
            return sum;
333
        }
334
    }
335

    
336
    return raw_pread_aligned(bs, offset, buf, count) + sum;
337
}
338

    
339
/*
340
 * offset and count are in bytes and possibly not aligned. For files opened
341
 * with O_DIRECT, necessary alignments are ensured before calling
342
 * raw_pwrite_aligned to do the actual write.
343
 */
344
static int raw_pwrite(BlockDriverState *bs, int64_t offset,
345
                      const uint8_t *buf, int count)
346
{
347
    BDRVRawState *s = bs->opaque;
348
    int size, ret, shift, sum;
349

    
350
    sum = 0;
351

    
352
    if (s->aligned_buf != NULL) {
353

    
354
        if (offset & 0x1ff) {
355
            /* align offset on a 512 bytes boundary */
356
            shift = offset & 0x1ff;
357
            ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, 512);
358
            if (ret < 0)
359
                return ret;
360

    
361
            size = 512 - shift;
362
            if (size > count)
363
                size = count;
364
            memcpy(s->aligned_buf + shift, buf, size);
365

    
366
            ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf, 512);
367
            if (ret < 0)
368
                return ret;
369

    
370
            buf += size;
371
            offset += size;
372
            count -= size;
373
            sum += size;
374

    
375
            if (count == 0)
376
                return sum;
377
        }
378
        if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
379

    
380
            while ((size = (count & ~0x1ff)) != 0) {
381

    
382
                if (size > ALIGNED_BUFFER_SIZE)
383
                    size = ALIGNED_BUFFER_SIZE;
384

    
385
                memcpy(s->aligned_buf, buf, size);
386

    
387
                ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size);
388
                if (ret < 0)
389
                    return ret;
390

    
391
                buf += ret;
392
                offset += ret;
393
                count -= ret;
394
                sum += ret;
395
            }
396
            /* here, count < 512 because (count & ~0x1ff) == 0 */
397
            if (count) {
398
                ret = raw_pread_aligned(bs, offset, s->aligned_buf, 512);
399
                if (ret < 0)
400
                    return ret;
401
                 memcpy(s->aligned_buf, buf, count);
402

    
403
                 ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, 512);
404
                 if (ret < 0)
405
                     return ret;
406
                 if (count < ret)
407
                     ret = count;
408

    
409
                 sum += ret;
410
            }
411
            return sum;
412
        }
413
    }
414
    return raw_pwrite_aligned(bs, offset, buf, count) + sum;
415
}
416

    
417
#else
418
#define raw_pread raw_pread_aligned
419
#define raw_pwrite raw_pwrite_aligned
420
#endif
421

    
422

    
423
#ifdef CONFIG_AIO
424
/***********************************************************/
425
/* Unix AIO using POSIX AIO */
426

    
427
typedef struct RawAIOCB {
428
    BlockDriverAIOCB common;
429
    struct aiocb aiocb;
430
    struct RawAIOCB *next;
431
    int ret;
432
} RawAIOCB;
433

    
434
static int aio_sig_num = SIGUSR2;
435
static RawAIOCB *first_aio; /* AIO issued */
436
static int aio_initialized = 0;
437

    
438
static void aio_signal_handler(int signum)
439
{
440
#if !defined(QEMU_IMG) && !defined(QEMU_NBD)
441
    CPUState *env = cpu_single_env;
442
    if (env) {
443
        /* stop the currently executing cpu because a timer occured */
444
        cpu_interrupt(env, CPU_INTERRUPT_EXIT);
445
#ifdef USE_KQEMU
446
        if (env->kqemu_enabled) {
447
            kqemu_cpu_interrupt(env);
448
        }
449
#endif
450
    }
451
#endif
452
}
453

    
454
void qemu_aio_init(void)
455
{
456
    struct sigaction act;
457

    
458
    aio_initialized = 1;
459

    
460
    sigfillset(&act.sa_mask);
461
    act.sa_flags = 0; /* do not restart syscalls to interrupt select() */
462
    act.sa_handler = aio_signal_handler;
463
    sigaction(aio_sig_num, &act, NULL);
464

    
465
#if defined(__GLIBC__) && defined(__linux__)
466
    {
467
        /* XXX: aio thread exit seems to hang on RedHat 9 and this init
468
           seems to fix the problem. */
469
        struct aioinit ai;
470
        memset(&ai, 0, sizeof(ai));
471
        ai.aio_threads = 1;
472
        ai.aio_num = 1;
473
        ai.aio_idle_time = 365 * 100000;
474
        aio_init(&ai);
475
    }
476
#endif
477
}
478

    
479
void qemu_aio_poll(void)
480
{
481
    RawAIOCB *acb, **pacb;
482
    int ret;
483

    
484
    for(;;) {
485
        pacb = &first_aio;
486
        for(;;) {
487
            acb = *pacb;
488
            if (!acb)
489
                goto the_end;
490
            ret = aio_error(&acb->aiocb);
491
            if (ret == ECANCELED) {
492
                /* remove the request */
493
                *pacb = acb->next;
494
                qemu_aio_release(acb);
495
            } else if (ret != EINPROGRESS) {
496
                /* end of aio */
497
                if (ret == 0) {
498
                    ret = aio_return(&acb->aiocb);
499
                    if (ret == acb->aiocb.aio_nbytes)
500
                        ret = 0;
501
                    else
502
                        ret = -EINVAL;
503
                } else {
504
                    ret = -ret;
505
                }
506
                /* remove the request */
507
                *pacb = acb->next;
508
                /* call the callback */
509
                acb->common.cb(acb->common.opaque, ret);
510
                qemu_aio_release(acb);
511
                break;
512
            } else {
513
                pacb = &acb->next;
514
            }
515
        }
516
    }
517
 the_end: ;
518
}
519

    
520
/* Wait for all IO requests to complete.  */
521
void qemu_aio_flush(void)
522
{
523
    qemu_aio_wait_start();
524
    qemu_aio_poll();
525
    while (first_aio) {
526
        qemu_aio_wait();
527
    }
528
    qemu_aio_wait_end();
529
}
530

    
531
/* wait until at least one AIO was handled */
532
static sigset_t wait_oset;
533

    
534
void qemu_aio_wait_start(void)
535
{
536
    sigset_t set;
537

    
538
    if (!aio_initialized)
539
        qemu_aio_init();
540
    sigemptyset(&set);
541
    sigaddset(&set, aio_sig_num);
542
    sigprocmask(SIG_BLOCK, &set, &wait_oset);
543
}
544

    
545
void qemu_aio_wait(void)
546
{
547
    sigset_t set;
548
    int nb_sigs;
549

    
550
#if !defined(QEMU_IMG) && !defined(QEMU_NBD)
551
    if (qemu_bh_poll())
552
        return;
553
#endif
554
    sigemptyset(&set);
555
    sigaddset(&set, aio_sig_num);
556
    sigwait(&set, &nb_sigs);
557
    qemu_aio_poll();
558
}
559

    
560
void qemu_aio_wait_end(void)
561
{
562
    sigprocmask(SIG_SETMASK, &wait_oset, NULL);
563
}
564

    
565
static RawAIOCB *raw_aio_setup(BlockDriverState *bs,
566
        int64_t sector_num, uint8_t *buf, int nb_sectors,
567
        BlockDriverCompletionFunc *cb, void *opaque)
568
{
569
    BDRVRawState *s = bs->opaque;
570
    RawAIOCB *acb;
571

    
572
    if (fd_open(bs) < 0)
573
        return NULL;
574

    
575
    acb = qemu_aio_get(bs, cb, opaque);
576
    if (!acb)
577
        return NULL;
578
    acb->aiocb.aio_fildes = s->fd;
579
    acb->aiocb.aio_sigevent.sigev_signo = aio_sig_num;
580
    acb->aiocb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
581
    acb->aiocb.aio_buf = buf;
582
    if (nb_sectors < 0)
583
        acb->aiocb.aio_nbytes = -nb_sectors;
584
    else
585
        acb->aiocb.aio_nbytes = nb_sectors * 512;
586
    acb->aiocb.aio_offset = sector_num * 512;
587
    acb->next = first_aio;
588
    first_aio = acb;
589
    return acb;
590
}
591

    
592
#if !defined(QEMU_IMG) && !defined(QEMU_NBD)
593
static void raw_aio_em_cb(void* opaque)
594
{
595
    RawAIOCB *acb = opaque;
596
    acb->common.cb(acb->common.opaque, acb->ret);
597
    qemu_aio_release(acb);
598
}
599
#endif
600

    
601
static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
602
        int64_t sector_num, uint8_t *buf, int nb_sectors,
603
        BlockDriverCompletionFunc *cb, void *opaque)
604
{
605
    RawAIOCB *acb;
606

    
607
    /*
608
     * If O_DIRECT is used and the buffer is not aligned fall back
609
     * to synchronous IO.
610
     */
611
#if defined(O_DIRECT) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
612
    BDRVRawState *s = bs->opaque;
613

    
614
    if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
615
        QEMUBH *bh;
616
        acb = qemu_aio_get(bs, cb, opaque);
617
        acb->ret = raw_pread(bs, 512 * sector_num, buf, 512 * nb_sectors);
618
        bh = qemu_bh_new(raw_aio_em_cb, acb);
619
        qemu_bh_schedule(bh);
620
        return &acb->common;
621
    }
622
#endif
623

    
624
    acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
625
    if (!acb)
626
        return NULL;
627
    if (aio_read(&acb->aiocb) < 0) {
628
        qemu_aio_release(acb);
629
        return NULL;
630
    }
631
    return &acb->common;
632
}
633

    
634
static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs,
635
        int64_t sector_num, const uint8_t *buf, int nb_sectors,
636
        BlockDriverCompletionFunc *cb, void *opaque)
637
{
638
    RawAIOCB *acb;
639

    
640
    /*
641
     * If O_DIRECT is used and the buffer is not aligned fall back
642
     * to synchronous IO.
643
     */
644
#if defined(O_DIRECT) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
645
    BDRVRawState *s = bs->opaque;
646

    
647
    if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
648
        QEMUBH *bh;
649
        acb = qemu_aio_get(bs, cb, opaque);
650
        acb->ret = raw_pwrite(bs, 512 * sector_num, buf, 512 * nb_sectors);
651
        bh = qemu_bh_new(raw_aio_em_cb, acb);
652
        qemu_bh_schedule(bh);
653
        return &acb->common;
654
    }
655
#endif
656

    
657
    acb = raw_aio_setup(bs, sector_num, (uint8_t*)buf, nb_sectors, cb, opaque);
658
    if (!acb)
659
        return NULL;
660
    if (aio_write(&acb->aiocb) < 0) {
661
        qemu_aio_release(acb);
662
        return NULL;
663
    }
664
    return &acb->common;
665
}
666

    
667
static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
668
{
669
    int ret;
670
    RawAIOCB *acb = (RawAIOCB *)blockacb;
671
    RawAIOCB **pacb;
672

    
673
    ret = aio_cancel(acb->aiocb.aio_fildes, &acb->aiocb);
674
    if (ret == AIO_NOTCANCELED) {
675
        /* fail safe: if the aio could not be canceled, we wait for
676
           it */
677
        while (aio_error(&acb->aiocb) == EINPROGRESS);
678
    }
679

    
680
    /* remove the callback from the queue */
681
    pacb = &first_aio;
682
    for(;;) {
683
        if (*pacb == NULL) {
684
            break;
685
        } else if (*pacb == acb) {
686
            *pacb = acb->next;
687
            qemu_aio_release(acb);
688
            break;
689
        }
690
        pacb = &acb->next;
691
    }
692
}
693

    
694
# else /* CONFIG_AIO */
695

    
696
void qemu_aio_init(void)
697
{
698
}
699

    
700
void qemu_aio_poll(void)
701
{
702
}
703

    
704
void qemu_aio_flush(void)
705
{
706
}
707

    
708
void qemu_aio_wait_start(void)
709
{
710
}
711

    
712
void qemu_aio_wait(void)
713
{
714
#if !defined(QEMU_IMG) && !defined(QEMU_NBD)
715
    qemu_bh_poll();
716
#endif
717
}
718

    
719
void qemu_aio_wait_end(void)
720
{
721
}
722

    
723
#endif /* CONFIG_AIO */
724

    
725
static void raw_close(BlockDriverState *bs)
726
{
727
    BDRVRawState *s = bs->opaque;
728
    if (s->fd >= 0) {
729
        close(s->fd);
730
        s->fd = -1;
731
#if defined(O_DIRECT) && !defined(QEMU_IMG)
732
        if (s->aligned_buf != NULL)
733
            qemu_free(s->aligned_buf);
734
#endif
735
    }
736
}
737

    
738
static int raw_truncate(BlockDriverState *bs, int64_t offset)
739
{
740
    BDRVRawState *s = bs->opaque;
741
    if (s->type != FTYPE_FILE)
742
        return -ENOTSUP;
743
    if (ftruncate(s->fd, offset) < 0)
744
        return -errno;
745
    return 0;
746
}
747

    
748
static int64_t  raw_getlength(BlockDriverState *bs)
749
{
750
    BDRVRawState *s = bs->opaque;
751
    int fd = s->fd;
752
    int64_t size;
753
#ifdef _BSD
754
    struct stat sb;
755
#endif
756
#ifdef __sun__
757
    struct dk_minfo minfo;
758
    int rv;
759
#endif
760
    int ret;
761

    
762
    ret = fd_open(bs);
763
    if (ret < 0)
764
        return ret;
765

    
766
#ifdef _BSD
767
    if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
768
#ifdef DIOCGMEDIASIZE
769
        if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
770
#endif
771
#ifdef CONFIG_COCOA
772
        size = LONG_LONG_MAX;
773
#else
774
        size = lseek(fd, 0LL, SEEK_END);
775
#endif
776
    } else
777
#endif
778
#ifdef __sun__
779
    /*
780
     * use the DKIOCGMEDIAINFO ioctl to read the size.
781
     */
782
    rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
783
    if ( rv != -1 ) {
784
        size = minfo.dki_lbsize * minfo.dki_capacity;
785
    } else /* there are reports that lseek on some devices
786
              fails, but irc discussion said that contingency
787
              on contingency was overkill */
788
#endif
789
    {
790
        size = lseek(fd, 0, SEEK_END);
791
    }
792
    return size;
793
}
794

    
795
static int raw_create(const char *filename, int64_t total_size,
796
                      const char *backing_file, int flags)
797
{
798
    int fd;
799

    
800
    if (flags || backing_file)
801
        return -ENOTSUP;
802

    
803
    fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
804
              0644);
805
    if (fd < 0)
806
        return -EIO;
807
    ftruncate(fd, total_size * 512);
808
    close(fd);
809
    return 0;
810
}
811

    
812
static void raw_flush(BlockDriverState *bs)
813
{
814
    BDRVRawState *s = bs->opaque;
815
    fsync(s->fd);
816
}
817

    
818
BlockDriver bdrv_raw = {
819
    "raw",
820
    sizeof(BDRVRawState),
821
    NULL, /* no probe for protocols */
822
    raw_open,
823
    NULL,
824
    NULL,
825
    raw_close,
826
    raw_create,
827
    raw_flush,
828

    
829
#ifdef CONFIG_AIO
830
    .bdrv_aio_read = raw_aio_read,
831
    .bdrv_aio_write = raw_aio_write,
832
    .bdrv_aio_cancel = raw_aio_cancel,
833
    .aiocb_size = sizeof(RawAIOCB),
834
#endif
835
    .protocol_name = "file",
836
    .bdrv_pread = raw_pread,
837
    .bdrv_pwrite = raw_pwrite,
838
    .bdrv_truncate = raw_truncate,
839
    .bdrv_getlength = raw_getlength,
840
};
841

    
842
/***********************************************/
843
/* host device */
844

    
845
#ifdef CONFIG_COCOA
846
static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
847
static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
848

    
849
kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
850
{
851
    kern_return_t       kernResult;
852
    mach_port_t     masterPort;
853
    CFMutableDictionaryRef  classesToMatch;
854

    
855
    kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
856
    if ( KERN_SUCCESS != kernResult ) {
857
        printf( "IOMasterPort returned %d\n", kernResult );
858
    }
859

    
860
    classesToMatch = IOServiceMatching( kIOCDMediaClass );
861
    if ( classesToMatch == NULL ) {
862
        printf( "IOServiceMatching returned a NULL dictionary.\n" );
863
    } else {
864
    CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
865
    }
866
    kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
867
    if ( KERN_SUCCESS != kernResult )
868
    {
869
        printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
870
    }
871

    
872
    return kernResult;
873
}
874

    
875
kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
876
{
877
    io_object_t     nextMedia;
878
    kern_return_t   kernResult = KERN_FAILURE;
879
    *bsdPath = '\0';
880
    nextMedia = IOIteratorNext( mediaIterator );
881
    if ( nextMedia )
882
    {
883
        CFTypeRef   bsdPathAsCFString;
884
    bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
885
        if ( bsdPathAsCFString ) {
886
            size_t devPathLength;
887
            strcpy( bsdPath, _PATH_DEV );
888
            strcat( bsdPath, "r" );
889
            devPathLength = strlen( bsdPath );
890
            if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
891
                kernResult = KERN_SUCCESS;
892
            }
893
            CFRelease( bsdPathAsCFString );
894
        }
895
        IOObjectRelease( nextMedia );
896
    }
897

    
898
    return kernResult;
899
}
900

    
901
#endif
902

    
903
static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
904
{
905
    BDRVRawState *s = bs->opaque;
906
    int fd, open_flags, ret;
907

    
908
#ifdef CONFIG_COCOA
909
    if (strstart(filename, "/dev/cdrom", NULL)) {
910
        kern_return_t kernResult;
911
        io_iterator_t mediaIterator;
912
        char bsdPath[ MAXPATHLEN ];
913
        int fd;
914

    
915
        kernResult = FindEjectableCDMedia( &mediaIterator );
916
        kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
917

    
918
        if ( bsdPath[ 0 ] != '\0' ) {
919
            strcat(bsdPath,"s0");
920
            /* some CDs don't have a partition 0 */
921
            fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
922
            if (fd < 0) {
923
                bsdPath[strlen(bsdPath)-1] = '1';
924
            } else {
925
                close(fd);
926
            }
927
            filename = bsdPath;
928
        }
929

    
930
        if ( mediaIterator )
931
            IOObjectRelease( mediaIterator );
932
    }
933
#endif
934
    open_flags = O_BINARY;
935
    if ((flags & BDRV_O_ACCESS) == O_RDWR) {
936
        open_flags |= O_RDWR;
937
    } else {
938
        open_flags |= O_RDONLY;
939
        bs->read_only = 1;
940
    }
941
#ifdef O_DIRECT
942
    if (flags & BDRV_O_DIRECT)
943
        open_flags |= O_DIRECT;
944
#endif
945

    
946
    s->type = FTYPE_FILE;
947
#if defined(__linux__)
948
    if (strstart(filename, "/dev/cd", NULL)) {
949
        /* open will not fail even if no CD is inserted */
950
        open_flags |= O_NONBLOCK;
951
        s->type = FTYPE_CD;
952
    } else if (strstart(filename, "/dev/fd", NULL)) {
953
        s->type = FTYPE_FD;
954
        s->fd_open_flags = open_flags;
955
        /* open will not fail even if no floppy is inserted */
956
        open_flags |= O_NONBLOCK;
957
    } else if (strstart(filename, "/dev/sg", NULL)) {
958
        bs->sg = 1;
959
    }
960
#endif
961
    fd = open(filename, open_flags, 0644);
962
    if (fd < 0) {
963
        ret = -errno;
964
        if (ret == -EROFS)
965
            ret = -EACCES;
966
        return ret;
967
    }
968
    s->fd = fd;
969
#if defined(__linux__)
970
    /* close fd so that we can reopen it as needed */
971
    if (s->type == FTYPE_FD) {
972
        close(s->fd);
973
        s->fd = -1;
974
        s->fd_media_changed = 1;
975
    }
976
#endif
977
    return 0;
978
}
979

    
980
#if defined(__linux__) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
981

    
982
/* Note: we do not have a reliable method to detect if the floppy is
983
   present. The current method is to try to open the floppy at every
984
   I/O and to keep it opened during a few hundreds of ms. */
985
static int fd_open(BlockDriverState *bs)
986
{
987
    BDRVRawState *s = bs->opaque;
988
    int last_media_present;
989

    
990
    if (s->type != FTYPE_FD)
991
        return 0;
992
    last_media_present = (s->fd >= 0);
993
    if (s->fd >= 0 &&
994
        (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
995
        close(s->fd);
996
        s->fd = -1;
997
#ifdef DEBUG_FLOPPY
998
        printf("Floppy closed\n");
999
#endif
1000
    }
1001
    if (s->fd < 0) {
1002
        if (s->fd_got_error &&
1003
            (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
1004
#ifdef DEBUG_FLOPPY
1005
            printf("No floppy (open delayed)\n");
1006
#endif
1007
            return -EIO;
1008
        }
1009
        s->fd = open(bs->filename, s->fd_open_flags);
1010
        if (s->fd < 0) {
1011
            s->fd_error_time = qemu_get_clock(rt_clock);
1012
            s->fd_got_error = 1;
1013
            if (last_media_present)
1014
                s->fd_media_changed = 1;
1015
#ifdef DEBUG_FLOPPY
1016
            printf("No floppy\n");
1017
#endif
1018
            return -EIO;
1019
        }
1020
#ifdef DEBUG_FLOPPY
1021
        printf("Floppy opened\n");
1022
#endif
1023
    }
1024
    if (!last_media_present)
1025
        s->fd_media_changed = 1;
1026
    s->fd_open_time = qemu_get_clock(rt_clock);
1027
    s->fd_got_error = 0;
1028
    return 0;
1029
}
1030
#else
1031
static int fd_open(BlockDriverState *bs)
1032
{
1033
    return 0;
1034
}
1035
#endif
1036

    
1037
#if defined(__linux__)
1038

    
1039
static int raw_is_inserted(BlockDriverState *bs)
1040
{
1041
    BDRVRawState *s = bs->opaque;
1042
    int ret;
1043

    
1044
    switch(s->type) {
1045
    case FTYPE_CD:
1046
        ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1047
        if (ret == CDS_DISC_OK)
1048
            return 1;
1049
        else
1050
            return 0;
1051
        break;
1052
    case FTYPE_FD:
1053
        ret = fd_open(bs);
1054
        return (ret >= 0);
1055
    default:
1056
        return 1;
1057
    }
1058
}
1059

    
1060
/* currently only used by fdc.c, but a CD version would be good too */
1061
static int raw_media_changed(BlockDriverState *bs)
1062
{
1063
    BDRVRawState *s = bs->opaque;
1064

    
1065
    switch(s->type) {
1066
    case FTYPE_FD:
1067
        {
1068
            int ret;
1069
            /* XXX: we do not have a true media changed indication. It
1070
               does not work if the floppy is changed without trying
1071
               to read it */
1072
            fd_open(bs);
1073
            ret = s->fd_media_changed;
1074
            s->fd_media_changed = 0;
1075
#ifdef DEBUG_FLOPPY
1076
            printf("Floppy changed=%d\n", ret);
1077
#endif
1078
            return ret;
1079
        }
1080
    default:
1081
        return -ENOTSUP;
1082
    }
1083
}
1084

    
1085
static int raw_eject(BlockDriverState *bs, int eject_flag)
1086
{
1087
    BDRVRawState *s = bs->opaque;
1088

    
1089
    switch(s->type) {
1090
    case FTYPE_CD:
1091
        if (eject_flag) {
1092
            if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
1093
                perror("CDROMEJECT");
1094
        } else {
1095
            if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
1096
                perror("CDROMEJECT");
1097
        }
1098
        break;
1099
    case FTYPE_FD:
1100
        {
1101
            int fd;
1102
            if (s->fd >= 0) {
1103
                close(s->fd);
1104
                s->fd = -1;
1105
            }
1106
            fd = open(bs->filename, s->fd_open_flags | O_NONBLOCK);
1107
            if (fd >= 0) {
1108
                if (ioctl(fd, FDEJECT, 0) < 0)
1109
                    perror("FDEJECT");
1110
                close(fd);
1111
            }
1112
        }
1113
        break;
1114
    default:
1115
        return -ENOTSUP;
1116
    }
1117
    return 0;
1118
}
1119

    
1120
static int raw_set_locked(BlockDriverState *bs, int locked)
1121
{
1122
    BDRVRawState *s = bs->opaque;
1123

    
1124
    switch(s->type) {
1125
    case FTYPE_CD:
1126
        if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
1127
            /* Note: an error can happen if the distribution automatically
1128
               mounts the CD-ROM */
1129
            //        perror("CDROM_LOCKDOOR");
1130
        }
1131
        break;
1132
    default:
1133
        return -ENOTSUP;
1134
    }
1135
    return 0;
1136
}
1137

    
1138
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1139
{
1140
    BDRVRawState *s = bs->opaque;
1141

    
1142
    return ioctl(s->fd, req, buf);
1143
}
1144
#else
1145

    
1146
static int raw_is_inserted(BlockDriverState *bs)
1147
{
1148
    return 1;
1149
}
1150

    
1151
static int raw_media_changed(BlockDriverState *bs)
1152
{
1153
    return -ENOTSUP;
1154
}
1155

    
1156
static int raw_eject(BlockDriverState *bs, int eject_flag)
1157
{
1158
    return -ENOTSUP;
1159
}
1160

    
1161
static int raw_set_locked(BlockDriverState *bs, int locked)
1162
{
1163
    return -ENOTSUP;
1164
}
1165

    
1166
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1167
{
1168
    return -ENOTSUP;
1169
}
1170
#endif /* !linux */
1171

    
1172
BlockDriver bdrv_host_device = {
1173
    "host_device",
1174
    sizeof(BDRVRawState),
1175
    NULL, /* no probe for protocols */
1176
    hdev_open,
1177
    NULL,
1178
    NULL,
1179
    raw_close,
1180
    NULL,
1181
    raw_flush,
1182

    
1183
#ifdef CONFIG_AIO
1184
    .bdrv_aio_read = raw_aio_read,
1185
    .bdrv_aio_write = raw_aio_write,
1186
    .bdrv_aio_cancel = raw_aio_cancel,
1187
    .aiocb_size = sizeof(RawAIOCB),
1188
#endif
1189
    .bdrv_pread = raw_pread,
1190
    .bdrv_pwrite = raw_pwrite,
1191
    .bdrv_getlength = raw_getlength,
1192

    
1193
    /* removable device support */
1194
    .bdrv_is_inserted = raw_is_inserted,
1195
    .bdrv_media_changed = raw_media_changed,
1196
    .bdrv_eject = raw_eject,
1197
    .bdrv_set_locked = raw_set_locked,
1198
    /* generic scsi device */
1199
    .bdrv_ioctl = raw_ioctl,
1200
};