qemu/block-raw-posix.c

   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 "compatfd.h"
  29 #include <assert.h>
  30 #ifdef CONFIG_AIO
  31 #include "posix-aio-compat.h"
  32 #endif
  33
  34 #ifdef CONFIG_COCOA
  35 #include <paths.h>
  36 #include <sys/param.h>
  37 #include <IOKit/IOKitLib.h>
  38 #include <IOKit/IOBSD.h>
  39 #include <IOKit/storage/IOMediaBSDClient.h>
  40 #include <IOKit/storage/IOMedia.h>
  41 #include <IOKit/storage/IOCDMedia.h>
  42 //#include <IOKit/storage/IOCDTypes.h>
  43 #include <CoreFoundation/CoreFoundation.h>
  44 #endif
  45
  46 #ifdef __sun__
  47 #define _POSIX_PTHREAD_SEMANTICS 1
  48 #include <signal.h>
  49 #include <sys/dkio.h>
  50 #endif
  51 #ifdef __linux__
  52 #include <sys/ioctl.h>
  53 #include <linux/cdrom.h>
  54 #include <linux/fd.h>
  55 #endif
  56 #ifdef __FreeBSD__
  57 #include <signal.h>
  58 #include <sys/disk.h>
  59 #include <sys/cdio.h>
  60 #endif
  61
  62 #ifdef __OpenBSD__
  63 #include <sys/ioctl.h>
  64 #include <sys/disklabel.h>
  65 #include <sys/dkio.h>
  66 #endif
  67
  68 #ifdef __DragonFly__
  69 #include <sys/ioctl.h>
  70 #include <sys/diskslice.h>
  71 #endif
  72
  73 //#define DEBUG_FLOPPY
  74
  75 //#define DEBUG_BLOCK
  76 #if defined(DEBUG_BLOCK)
  77 #define DEBUG_BLOCK_PRINT(formatCstr, args...) do { if (qemu_log_enabled())     \
  78     { qemu_log(formatCstr, ##args); qemu_log_flush(); } } while (0)
  79 #else
  80 #define DEBUG_BLOCK_PRINT(formatCstr, args...)
  81 #endif
  82
  83 /* OS X does not have O_DSYNC */
  84 #ifndef O_DSYNC
  85 #define O_DSYNC O_SYNC
  86 #endif
  87
  88 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
  89 #ifndef O_DIRECT
  90 #define O_DIRECT O_DSYNC
  91 #endif
  92
  93 #define FTYPE_FILE   0
  94 #define FTYPE_CD     1
  95 #define FTYPE_FD     2
  96
  97 #define ALIGNED_BUFFER_SIZE (32 * 512)
  98
  99 /* if the FD is not accessed during that time (in ms), we try to
 100    reopen it to see if the disk has been changed */
 101 #define FD_OPEN_TIMEOUT 1000
 102
 103 typedef struct BDRVRawState {
 104     int fd;
 105     int type;
 106     unsigned int lseek_err_cnt;
 107 #if defined(__linux__)
 108     /* linux floppy specific */
 109     int fd_open_flags;
 110     int64_t fd_open_time;
 111     int64_t fd_error_time;
 112     int fd_got_error;
 113     int fd_media_changed;
 114 #endif
 115 #if defined(__FreeBSD__)
 116     int cd_open_flags;
 117 #endif
 118     uint8_t* aligned_buf;
 119 } BDRVRawState;
 120
 121 static int posix_aio_init(void);
 122
 123 static int fd_open(BlockDriverState *bs);
 124
 125 #if defined(__FreeBSD__)
 126 static int cd_open(BlockDriverState *bs);
 127 #endif
 128
 129 static int raw_is_inserted(BlockDriverState *bs);
 130
 131 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
 132 {
 133     BDRVRawState *s = bs->opaque;
 134     int fd, open_flags, ret;
 135
 136     posix_aio_init();
 137
 138     s->lseek_err_cnt = 0;
 139
 140     open_flags = O_BINARY;
 141     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 142         open_flags |= O_RDWR;
 143     } else {
 144         open_flags |= O_RDONLY;
 145         bs->read_only = 1;
 146     }
 147     if (flags & BDRV_O_CREAT)
 148         open_flags |= O_CREAT | O_TRUNC;
 149
 150     /* Use O_DSYNC for write-through caching, no flags for write-back caching,
 151      * and O_DIRECT for no caching. */
 152     if ((flags & BDRV_O_NOCACHE))
 153         open_flags |= O_DIRECT;
 154     else if (!(flags & BDRV_O_CACHE_WB))
 155         open_flags |= O_DSYNC;
 156
 157     s->type = FTYPE_FILE;
 158
 159     fd = open(filename, open_flags, 0644);
 160     if (fd < 0) {
 161         ret = -errno;
 162         if (ret == -EROFS)
 163             ret = -EACCES;
 164         return ret;
 165     }
 166     s->fd = fd;
 167     s->aligned_buf = NULL;
 168     if ((flags & BDRV_O_NOCACHE)) {
 169         s->aligned_buf = qemu_memalign(512, ALIGNED_BUFFER_SIZE);
 170         if (s->aligned_buf == NULL) {
 171             ret = -errno;
 172             close(fd);
 173             return ret;
 174         }
 175     }
 176     return 0;
 177 }
 178
 179 /* XXX: use host sector size if necessary with:
 180 #ifdef DIOCGSECTORSIZE
 181         {
 182             unsigned int sectorsize = 512;
 183             if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
 184                 sectorsize > bufsize)
 185                 bufsize = sectorsize;
 186         }
 187 #endif
 188 #ifdef CONFIG_COCOA
 189         u_int32_t   blockSize = 512;
 190         if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
 191             bufsize = blockSize;
 192         }
 193 #endif
 194 */
 195
 196 /*
 197  * offset and count are in bytes, but must be multiples of 512 for files
 198  * opened with O_DIRECT. buf must be aligned to 512 bytes then.
 199  *
 200  * This function may be called without alignment if the caller ensures
 201  * that O_DIRECT is not in effect.
 202  */
 203 static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
 204                      uint8_t *buf, int count)
 205 {
 206     BDRVRawState *s = bs->opaque;
 207     int ret;
 208
 209     ret = fd_open(bs);
 210     if (ret < 0)
 211         return ret;
 212
 213     if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
 214         ++(s->lseek_err_cnt);
 215         if(s->lseek_err_cnt <= 10) {
 216             DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 217                               "] lseek failed : %d = %s\n",
 218                               s->fd, bs->filename, offset, buf, count,
 219                               bs->total_sectors, errno, strerror(errno));
 220         }
 221         return -1;
 222     }
 223     s->lseek_err_cnt=0;
 224
 225     ret = read(s->fd, buf, count);
 226     if (ret == count)
 227         goto label__raw_read__success;
 228
 229     DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 230                       "] read failed %d : %d = %s\n",
 231                       s->fd, bs->filename, offset, buf, count,
 232                       bs->total_sectors, ret, errno, strerror(errno));
 233
 234     /* Try harder for CDrom. */
 235     if (bs->type == BDRV_TYPE_CDROM) {
 236         lseek(s->fd, offset, SEEK_SET);
 237         ret = read(s->fd, buf, count);
 238         if (ret == count)
 239             goto label__raw_read__success;
 240         lseek(s->fd, offset, SEEK_SET);
 241         ret = read(s->fd, buf, count);
 242         if (ret == count)
 243             goto label__raw_read__success;
 244
 245         DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 246                           "] retry read failed %d : %d = %s\n",
 247                           s->fd, bs->filename, offset, buf, count,
 248                           bs->total_sectors, ret, errno, strerror(errno));
 249     }
 250
 251 label__raw_read__success:
 252
 253     return ret;
 254 }
 255
 256 /*
 257  * offset and count are in bytes, but must be multiples of 512 for files
 258  * opened with O_DIRECT. buf must be aligned to 512 bytes then.
 259  *
 260  * This function may be called without alignment if the caller ensures
 261  * that O_DIRECT is not in effect.
 262  */
 263 static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
 264                       const uint8_t *buf, int count)
 265 {
 266     BDRVRawState *s = bs->opaque;
 267     int ret;
 268
 269     ret = fd_open(bs);
 270     if (ret < 0)
 271         return -errno;
 272
 273     if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
 274         ++(s->lseek_err_cnt);
 275         if(s->lseek_err_cnt) {
 276             DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%"
 277                               PRId64 "] lseek failed : %d = %s\n",
 278                               s->fd, bs->filename, offset, buf, count,
 279                               bs->total_sectors, errno, strerror(errno));
 280         }
 281         return -EIO;
 282     }
 283     s->lseek_err_cnt = 0;
 284
 285     ret = write(s->fd, buf, count);
 286     if (ret == count)
 287         goto label__raw_write__success;
 288
 289     DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 290                       "] write failed %d : %d = %s\n",
 291                       s->fd, bs->filename, offset, buf, count,
 292                       bs->total_sectors, ret, errno, strerror(errno));
 293
 294 label__raw_write__success:
 295
 296     return  (ret < 0) ? -errno : ret;
 297 }
 298
 299
 300 /*
 301  * offset and count are in bytes and possibly not aligned. For files opened
 302  * with O_DIRECT, necessary alignments are ensured before calling
 303  * raw_pread_aligned to do the actual read.
 304  */
 305 static int raw_pread(BlockDriverState *bs, int64_t offset,
 306                      uint8_t *buf, int count)
 307 {
 308     BDRVRawState *s = bs->opaque;
 309     int size, ret, shift, sum;
 310
 311     sum = 0;
 312
 313     if (s->aligned_buf != NULL)  {
 314
 315         if (offset & 0x1ff) {
 316             /* align offset on a 512 bytes boundary */
 317
 318             shift = offset & 0x1ff;
 319             size = (shift + count + 0x1ff) & ~0x1ff;
 320             if (size > ALIGNED_BUFFER_SIZE)
 321                 size = ALIGNED_BUFFER_SIZE;
 322             ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size);
 323             if (ret < 0)
 324                 return ret;
 325
 326             size = 512 - shift;
 327             if (size > count)
 328                 size = count;
 329             memcpy(buf, s->aligned_buf + shift, size);
 330
 331             buf += size;
 332             offset += size;
 333             count -= size;
 334             sum += size;
 335
 336             if (count == 0)
 337                 return sum;
 338         }
 339         if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
 340
 341             /* read on aligned buffer */
 342
 343             while (count) {
 344
 345                 size = (count + 0x1ff) & ~0x1ff;
 346                 if (size > ALIGNED_BUFFER_SIZE)
 347                     size = ALIGNED_BUFFER_SIZE;
 348
 349                 ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
 350                 if (ret < 0)
 351                     return ret;
 352
 353                 size = ret;
 354                 if (size > count)
 355                     size = count;
 356
 357                 memcpy(buf, s->aligned_buf, size);
 358
 359                 buf += size;
 360                 offset += size;
 361                 count -= size;
 362                 sum += size;
 363             }
 364
 365             return sum;
 366         }
 367     }
 368
 369     return raw_pread_aligned(bs, offset, buf, count) + sum;
 370 }
 371
 372 static int raw_read(BlockDriverState *bs, int64_t sector_num,
 373                     uint8_t *buf, int nb_sectors)
 374 {
 375     int ret;
 376
 377     ret = raw_pread(bs, sector_num * 512, buf, nb_sectors * 512);
 378     if (ret == (nb_sectors * 512))
 379         ret = 0;
 380     return ret;
 381 }
 382
 383 /*
 384  * offset and count are in bytes and possibly not aligned. For files opened
 385  * with O_DIRECT, necessary alignments are ensured before calling
 386  * raw_pwrite_aligned to do the actual write.
 387  */
 388 static int raw_pwrite(BlockDriverState *bs, int64_t offset,
 389                       const uint8_t *buf, int count)
 390 {
 391     BDRVRawState *s = bs->opaque;
 392     int size, ret, shift, sum;
 393
 394     sum = 0;
 395
 396     if (s->aligned_buf != NULL) {
 397
 398         if (offset & 0x1ff) {
 399             /* align offset on a 512 bytes boundary */
 400             shift = offset & 0x1ff;
 401             ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, 512);
 402             if (ret < 0)
 403                 return ret;
 404
 405             size = 512 - shift;
 406             if (size > count)
 407                 size = count;
 408             memcpy(s->aligned_buf + shift, buf, size);
 409
 410             ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf, 512);
 411             if (ret < 0)
 412                 return ret;
 413
 414             buf += size;
 415             offset += size;
 416             count -= size;
 417             sum += size;
 418
 419             if (count == 0)
 420                 return sum;
 421         }
 422         if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
 423
 424             while ((size = (count & ~0x1ff)) != 0) {
 425
 426                 if (size > ALIGNED_BUFFER_SIZE)
 427                     size = ALIGNED_BUFFER_SIZE;
 428
 429                 memcpy(s->aligned_buf, buf, size);
 430
 431                 ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size);
 432                 if (ret < 0)
 433                     return ret;
 434
 435                 buf += ret;
 436                 offset += ret;
 437                 count -= ret;
 438                 sum += ret;
 439             }
 440             /* here, count < 512 because (count & ~0x1ff) == 0 */
 441             if (count) {
 442                 ret = raw_pread_aligned(bs, offset, s->aligned_buf, 512);
 443                 if (ret < 0)
 444                     return ret;
 445                  memcpy(s->aligned_buf, buf, count);
 446
 447                  ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, 512);
 448                  if (ret < 0)
 449                      return ret;
 450                  if (count < ret)
 451                      ret = count;
 452
 453                  sum += ret;
 454             }
 455             return sum;
 456         }
 457     }
 458     return raw_pwrite_aligned(bs, offset, buf, count) + sum;
 459 }
 460
 461 static int raw_write(BlockDriverState *bs, int64_t sector_num,
 462                      const uint8_t *buf, int nb_sectors)
 463 {
 464     int ret;
 465     ret = raw_pwrite(bs, sector_num * 512, buf, nb_sectors * 512);
 466     if (ret == (nb_sectors * 512))
 467         ret = 0;
 468     return ret;
 469 }
 470
 471 #ifdef CONFIG_AIO
 472 /***********************************************************/
 473 /* Unix AIO using POSIX AIO */
 474
 475 typedef struct RawAIOCB {
 476     BlockDriverAIOCB common;
 477     struct qemu_paiocb aiocb;
 478     struct RawAIOCB *next;
 479     int ret;
 480 } RawAIOCB;
 481
 482 typedef struct PosixAioState
 483 {
 484     int fd;
 485     RawAIOCB *first_aio;
 486 } PosixAioState;
 487
 488 static void posix_aio_read(void *opaque)
 489 {
 490     PosixAioState *s = opaque;
 491     RawAIOCB *acb, **pacb;
 492     int ret;
 493     size_t offset;
 494     union {
 495         struct qemu_signalfd_siginfo siginfo;
 496         char buf[128];
 497     } sig;
 498
 499     /* try to read from signalfd, don't freak out if we can't read anything */
 500     offset = 0;
 501     while (offset < 128) {
 502         ssize_t len;
 503
 504         len = read(s->fd, sig.buf + offset, 128 - offset);
 505         if (len == -1 && errno == EINTR)
 506             continue;
 507         if (len == -1 && errno == EAGAIN) {
 508             /* there is no natural reason for this to happen,
 509              * so we'll spin hard until we get everything just
 510              * to be on the safe side. */
 511             if (offset > 0)
 512                 continue;
 513         }
 514
 515         offset += len;
 516     }
 517
 518     for(;;) {
 519         pacb = &s->first_aio;
 520         for(;;) {
 521             acb = *pacb;
 522             if (!acb)
 523                 goto the_end;
 524             ret = qemu_paio_error(&acb->aiocb);
 525             if (ret == ECANCELED) {
 526                 /* remove the request */
 527                 *pacb = acb->next;
 528                 qemu_aio_release(acb);
 529             } else if (ret != EINPROGRESS) {
 530                 /* end of aio */
 531                 if (ret == 0) {
 532                     ret = qemu_paio_return(&acb->aiocb);
 533                     if (ret == acb->aiocb.aio_nbytes)
 534                         ret = 0;
 535                     else
 536                         ret = -EINVAL;
 537                 } else {
 538                     ret = -ret;
 539                 }
 540                 /* remove the request */
 541                 *pacb = acb->next;
 542                 /* call the callback */
 543                 acb->common.cb(acb->common.opaque, ret);
 544                 qemu_aio_release(acb);
 545                 break;
 546             } else {
 547                 pacb = &acb->next;
 548             }
 549         }
 550     }
 551  the_end: ;
 552 }
 553
 554 static int posix_aio_flush(void *opaque)
 555 {
 556     PosixAioState *s = opaque;
 557     return !!s->first_aio;
 558 }
 559
 560 static PosixAioState *posix_aio_state;
 561
 562 static int posix_aio_init(void)
 563 {
 564     sigset_t mask;
 565     PosixAioState *s;
 566     struct qemu_paioinit ai;
 567
 568     if (posix_aio_state)
 569         return 0;
 570
 571     s = qemu_malloc(sizeof(PosixAioState));
 572
 573     /* Make sure to block AIO signal */
 574     sigemptyset(&mask);
 575     sigaddset(&mask, SIGUSR2);
 576     sigprocmask(SIG_BLOCK, &mask, NULL);
 577
 578     s->first_aio = NULL;
 579     s->fd = qemu_signalfd(&mask);
 580     if (s->fd == -1) {
 581         fprintf(stderr, "failed to create signalfd\n");
 582         return -errno;
 583     }
 584
 585     fcntl(s->fd, F_SETFL, O_NONBLOCK);
 586
 587     qemu_aio_set_fd_handler(s->fd, posix_aio_read, NULL, posix_aio_flush, s);
 588
 589     memset(&ai, 0, sizeof(ai));
 590     ai.aio_threads = 64;
 591     ai.aio_num = 64;
 592     qemu_paio_init(&ai);
 593
 594     posix_aio_state = s;
 595
 596     return 0;
 597 }
 598
 599 static RawAIOCB *raw_aio_setup(BlockDriverState *bs,
 600         int64_t sector_num, uint8_t *buf, int nb_sectors,
 601         BlockDriverCompletionFunc *cb, void *opaque)
 602 {
 603     BDRVRawState *s = bs->opaque;
 604     RawAIOCB *acb;
 605
 606     if (fd_open(bs) < 0)
 607         return NULL;
 608
 609     acb = qemu_aio_get(bs, cb, opaque);
 610     if (!acb)
 611         return NULL;
 612     acb->aiocb.aio_fildes = s->fd;
 613     acb->aiocb.ev_signo = SIGUSR2;
 614     acb->aiocb.aio_buf = buf;
 615     if (nb_sectors < 0)
 616         acb->aiocb.aio_nbytes = -nb_sectors;
 617     else
 618         acb->aiocb.aio_nbytes = nb_sectors * 512;
 619     acb->aiocb.aio_offset = sector_num * 512;
 620     acb->next = posix_aio_state->first_aio;
 621     posix_aio_state->first_aio = acb;
 622     return acb;
 623 }
 624
 625 static void raw_aio_em_cb(void* opaque)
 626 {
 627     RawAIOCB *acb = opaque;
 628     acb->common.cb(acb->common.opaque, acb->ret);
 629     qemu_aio_release(acb);
 630 }
 631
 632 static void raw_aio_remove(RawAIOCB *acb)
 633 {
 634     RawAIOCB **pacb;
 635
 636     /* remove the callback from the queue */
 637     pacb = &posix_aio_state->first_aio;
 638     for(;;) {
 639         if (*pacb == NULL) {
 640             fprintf(stderr, "raw_aio_remove: aio request not found!\n");
 641             break;
 642         } else if (*pacb == acb) {
 643             *pacb = acb->next;
 644             qemu_aio_release(acb);
 645             break;
 646         }
 647         pacb = &(*pacb)->next;
 648     }
 649 }
 650
 651 static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
 652         int64_t sector_num, uint8_t *buf, int nb_sectors,
 653         BlockDriverCompletionFunc *cb, void *opaque)
 654 {
 655     RawAIOCB *acb;
 656
 657     /*
 658      * If O_DIRECT is used and the buffer is not aligned fall back
 659      * to synchronous IO.
 660      */
 661     BDRVRawState *s = bs->opaque;
 662
 663     if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
 664         QEMUBH *bh;
 665         acb = qemu_aio_get(bs, cb, opaque);
 666         acb->ret = raw_pread(bs, 512 * sector_num, buf, 512 * nb_sectors);
 667         bh = qemu_bh_new(raw_aio_em_cb, acb);
 668         qemu_bh_schedule(bh);
 669         return &acb->common;
 670     }
 671
 672     acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
 673     if (!acb)
 674         return NULL;
 675     if (qemu_paio_read(&acb->aiocb) < 0) {
 676         raw_aio_remove(acb);
 677         return NULL;
 678     }
 679     return &acb->common;
 680 }
 681
 682 static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs,
 683         int64_t sector_num, const uint8_t *buf, int nb_sectors,
 684         BlockDriverCompletionFunc *cb, void *opaque)
 685 {
 686     RawAIOCB *acb;
 687
 688     /*
 689      * If O_DIRECT is used and the buffer is not aligned fall back
 690      * to synchronous IO.
 691      */
 692     BDRVRawState *s = bs->opaque;
 693
 694     if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
 695         QEMUBH *bh;
 696         acb = qemu_aio_get(bs, cb, opaque);
 697         acb->ret = raw_pwrite(bs, 512 * sector_num, buf, 512 * nb_sectors);
 698         bh = qemu_bh_new(raw_aio_em_cb, acb);
 699         qemu_bh_schedule(bh);
 700         return &acb->common;
 701     }
 702
 703     acb = raw_aio_setup(bs, sector_num, (uint8_t*)buf, nb_sectors, cb, opaque);
 704     if (!acb)
 705         return NULL;
 706     if (qemu_paio_write(&acb->aiocb) < 0) {
 707         raw_aio_remove(acb);
 708         return NULL;
 709     }
 710     return &acb->common;
 711 }
 712
 713 static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
 714 {
 715     int ret;
 716     RawAIOCB *acb = (RawAIOCB *)blockacb;
 717
 718     ret = qemu_paio_cancel(acb->aiocb.aio_fildes, &acb->aiocb);
 719     if (ret == QEMU_PAIO_NOTCANCELED) {
 720         /* fail safe: if the aio could not be canceled, we wait for
 721            it */
 722         while (qemu_paio_error(&acb->aiocb) == EINPROGRESS);
 723     }
 724
 725     raw_aio_remove(acb);
 726 }
 727 #else /* CONFIG_AIO */
 728 static int posix_aio_init(void)
 729 {
 730     return 0;
 731 }
 732 #endif /* CONFIG_AIO */
 733
 734
 735 static void raw_close(BlockDriverState *bs)
 736 {
 737     BDRVRawState *s = bs->opaque;
 738     if (s->fd >= 0) {
 739         close(s->fd);
 740         s->fd = -1;
 741         if (s->aligned_buf != NULL)
 742             qemu_free(s->aligned_buf);
 743     }
 744 }
 745
 746 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 747 {
 748     BDRVRawState *s = bs->opaque;
 749     if (s->type != FTYPE_FILE)
 750         return -ENOTSUP;
 751     if (ftruncate(s->fd, offset) < 0)
 752         return -errno;
 753     return 0;
 754 }
 755
 756 #ifdef __OpenBSD__
 757 static int64_t raw_getlength(BlockDriverState *bs)
 758 {
 759     BDRVRawState *s = bs->opaque;
 760     int fd = s->fd;
 761     struct stat st;
 762
 763     if (fstat(fd, &st))
 764         return -1;
 765     if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
 766         struct disklabel dl;
 767
 768         if (ioctl(fd, DIOCGDINFO, &dl))
 769             return -1;
 770         return (uint64_t)dl.d_secsize *
 771             dl.d_partitions[DISKPART(st.st_rdev)].p_size;
 772     } else
 773         return st.st_size;
 774 }
 775 #else /* !__OpenBSD__ */
 776 static int64_t  raw_getlength(BlockDriverState *bs)
 777 {
 778     BDRVRawState *s = bs->opaque;
 779     int fd = s->fd;
 780     int64_t size;
 781 #ifdef HOST_BSD
 782     struct stat sb;
 783 #ifdef __FreeBSD__
 784     int reopened = 0;
 785 #endif
 786 #endif
 787 #ifdef __sun__
 788     struct dk_minfo minfo;
 789     int rv;
 790 #endif
 791     int ret;
 792
 793     ret = fd_open(bs);
 794     if (ret < 0)
 795         return ret;
 796
 797 #ifdef HOST_BSD
 798 #ifdef __FreeBSD__
 799 again:
 800 #endif
 801     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
 802 #ifdef DIOCGMEDIASIZE
 803         if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
 804 #elif defined(DIOCGPART)
 805         {
 806                 struct partinfo pi;
 807                 if (ioctl(fd, DIOCGPART, &pi) == 0)
 808                         size = pi.media_size;
 809                 else
 810                         size = 0;
 811         }
 812         if (size == 0)
 813 #endif
 814 #ifdef CONFIG_COCOA
 815         size = LONG_LONG_MAX;
 816 #else
 817         size = lseek(fd, 0LL, SEEK_END);
 818 #endif
 819 #ifdef __FreeBSD__
 820         switch(s->type) {
 821         case FTYPE_CD:
 822             /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
 823             if (size == 2048LL * (unsigned)-1)
 824                 size = 0;
 825             /* XXX no disc?  maybe we need to reopen... */
 826             if (size <= 0 && !reopened && cd_open(bs) >= 0) {
 827                 reopened = 1;
 828                 goto again;
 829             }
 830         }
 831 #endif
 832     } else
 833 #endif
 834 #ifdef __sun__
 835     /*
 836      * use the DKIOCGMEDIAINFO ioctl to read the size.
 837      */
 838     rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
 839     if ( rv != -1 ) {
 840         size = minfo.dki_lbsize * minfo.dki_capacity;
 841     } else /* there are reports that lseek on some devices
 842               fails, but irc discussion said that contingency
 843               on contingency was overkill */
 844 #endif
 845     {
 846         size = lseek(fd, 0, SEEK_END);
 847     }
 848     return size;
 849 }
 850 #endif
 851
 852 static int raw_create(const char *filename, int64_t total_size,
 853                       const char *backing_file, int flags)
 854 {
 855     int fd;
 856
 857     if (flags || backing_file)
 858         return -ENOTSUP;
 859
 860     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 861               0644);
 862     if (fd < 0)
 863         return -EIO;
 864     ftruncate(fd, total_size * 512);
 865     close(fd);
 866     return 0;
 867 }
 868
 869 static void raw_flush(BlockDriverState *bs)
 870 {
 871     BDRVRawState *s = bs->opaque;
 872     fsync(s->fd);
 873 }
 874
 875 BlockDriver bdrv_raw = {
 876     "raw",
 877     sizeof(BDRVRawState),
 878     NULL, /* no probe for protocols */
 879     raw_open,
 880     NULL,
 881     NULL,
 882     raw_close,
 883     raw_create,
 884     raw_flush,
 885
 886 #ifdef CONFIG_AIO
 887     .bdrv_aio_read = raw_aio_read,
 888     .bdrv_aio_write = raw_aio_write,
 889     .bdrv_aio_cancel = raw_aio_cancel,
 890     .aiocb_size = sizeof(RawAIOCB),
 891 #endif
 892
 893     .bdrv_read = raw_read,
 894     .bdrv_write = raw_write,
 895     .bdrv_truncate = raw_truncate,
 896     .bdrv_getlength = raw_getlength,
 897 };
 898
 899 /***********************************************/
 900 /* host device */
 901
 902 #ifdef CONFIG_COCOA
 903 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
 904 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
 905
 906 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
 907 {
 908     kern_return_t       kernResult;
 909     mach_port_t     masterPort;
 910     CFMutableDictionaryRef  classesToMatch;
 911
 912     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
 913     if ( KERN_SUCCESS != kernResult ) {
 914         printf( "IOMasterPort returned %d\n", kernResult );
 915     }
 916
 917     classesToMatch = IOServiceMatching( kIOCDMediaClass );
 918     if ( classesToMatch == NULL ) {
 919         printf( "IOServiceMatching returned a NULL dictionary.\n" );
 920     } else {
 921     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
 922     }
 923     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
 924     if ( KERN_SUCCESS != kernResult )
 925     {
 926         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
 927     }
 928
 929     return kernResult;
 930 }
 931
 932 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
 933 {
 934     io_object_t     nextMedia;
 935     kern_return_t   kernResult = KERN_FAILURE;
 936     *bsdPath = '\0';
 937     nextMedia = IOIteratorNext( mediaIterator );
 938     if ( nextMedia )
 939     {
 940         CFTypeRef   bsdPathAsCFString;
 941     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
 942         if ( bsdPathAsCFString ) {
 943             size_t devPathLength;
 944             strcpy( bsdPath, _PATH_DEV );
 945             strcat( bsdPath, "r" );
 946             devPathLength = strlen( bsdPath );
 947             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
 948                 kernResult = KERN_SUCCESS;
 949             }
 950             CFRelease( bsdPathAsCFString );
 951         }
 952         IOObjectRelease( nextMedia );
 953     }
 954
 955     return kernResult;
 956 }
 957
 958 #endif
 959
 960 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 961 {
 962     BDRVRawState *s = bs->opaque;
 963     int fd, open_flags, ret;
 964
 965     posix_aio_init();
 966
 967 #ifdef CONFIG_COCOA
 968     if (strstart(filename, "/dev/cdrom", NULL)) {
 969         kern_return_t kernResult;
 970         io_iterator_t mediaIterator;
 971         char bsdPath[ MAXPATHLEN ];
 972         int fd;
 973
 974         kernResult = FindEjectableCDMedia( &mediaIterator );
 975         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
 976
 977         if ( bsdPath[ 0 ] != '\0' ) {
 978             strcat(bsdPath,"s0");
 979             /* some CDs don't have a partition 0 */
 980             fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
 981             if (fd < 0) {
 982                 bsdPath[strlen(bsdPath)-1] = '1';
 983             } else {
 984                 close(fd);
 985             }
 986             filename = bsdPath;
 987         }
 988
 989         if ( mediaIterator )
 990             IOObjectRelease( mediaIterator );
 991     }
 992 #endif
 993     open_flags = O_BINARY;
 994     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 995         open_flags |= O_RDWR;
 996     } else {
 997         open_flags |= O_RDONLY;
 998         bs->read_only = 1;
 999     }
1000     /* Use O_DSYNC for write-through caching, no flags for write-back caching,
1001      * and O_DIRECT for no caching. */
1002     if ((flags & BDRV_O_NOCACHE))
1003         open_flags |= O_DIRECT;
1004     else if (!(flags & BDRV_O_CACHE_WB))
1005         open_flags |= O_DSYNC;
1006
1007     s->type = FTYPE_FILE;
1008 #if defined(__linux__)
1009     if (strstart(filename, "/dev/cd", NULL)) {
1010         /* open will not fail even if no CD is inserted */
1011         open_flags |= O_NONBLOCK;
1012         s->type = FTYPE_CD;
1013     } else if (strstart(filename, "/dev/fd", NULL)) {
1014         s->type = FTYPE_FD;
1015         s->fd_open_flags = open_flags;
1016         /* open will not fail even if no floppy is inserted */
1017         open_flags |= O_NONBLOCK;
1018 #ifdef CONFIG_AIO
1019     } else if (strstart(filename, "/dev/sg", NULL)) {
1020         bs->sg = 1;
1021 #endif
1022     }
1023 #endif
1024 #if defined(__FreeBSD__)
1025     if (strstart(filename, "/dev/cd", NULL) ||
1026         strstart(filename, "/dev/acd", NULL)) {
1027         s->type = FTYPE_CD;
1028         s->cd_open_flags = open_flags;
1029     }
1030 #endif
1031     s->fd = -1;
1032     fd = open(filename, open_flags, 0644);
1033     if (fd < 0) {
1034         ret = -errno;
1035         if (ret == -EROFS)
1036             ret = -EACCES;
1037         return ret;
1038     }
1039     s->fd = fd;
1040 #if defined(__FreeBSD__)
1041     /* make sure the door isnt locked at this time */
1042     if (s->type == FTYPE_CD)
1043         ioctl (s->fd, CDIOCALLOW);
1044 #endif
1045 #if defined(__linux__)
1046     /* close fd so that we can reopen it as needed */
1047     if (s->type == FTYPE_FD) {
1048         close(s->fd);
1049         s->fd = -1;
1050         s->fd_media_changed = 1;
1051     }
1052 #endif
1053     return 0;
1054 }
1055
1056 #if defined(__linux__)
1057 /* Note: we do not have a reliable method to detect if the floppy is
1058    present. The current method is to try to open the floppy at every
1059    I/O and to keep it opened during a few hundreds of ms. */
1060 static int fd_open(BlockDriverState *bs)
1061 {
1062     BDRVRawState *s = bs->opaque;
1063     int last_media_present;
1064
1065     if (s->type != FTYPE_FD)
1066         return 0;
1067     last_media_present = (s->fd >= 0);
1068     if (s->fd >= 0 &&
1069         (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
1070         close(s->fd);
1071         s->fd = -1;
1072 #ifdef DEBUG_FLOPPY
1073         printf("Floppy closed\n");
1074 #endif
1075     }
1076     if (s->fd < 0) {
1077         if (s->fd_got_error &&
1078             (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
1079 #ifdef DEBUG_FLOPPY
1080             printf("No floppy (open delayed)\n");
1081 #endif
1082             return -EIO;
1083         }
1084         s->fd = open(bs->filename, s->fd_open_flags);
1085         if (s->fd < 0) {
1086             s->fd_error_time = qemu_get_clock(rt_clock);
1087             s->fd_got_error = 1;
1088             if (last_media_present)
1089                 s->fd_media_changed = 1;
1090 #ifdef DEBUG_FLOPPY
1091             printf("No floppy\n");
1092 #endif
1093             return -EIO;
1094         }
1095 #ifdef DEBUG_FLOPPY
1096         printf("Floppy opened\n");
1097 #endif
1098     }
1099     if (!last_media_present)
1100         s->fd_media_changed = 1;
1101     s->fd_open_time = qemu_get_clock(rt_clock);
1102     s->fd_got_error = 0;
1103     return 0;
1104 }
1105
1106 static int raw_is_inserted(BlockDriverState *bs)
1107 {
1108     BDRVRawState *s = bs->opaque;
1109     int ret;
1110
1111     switch(s->type) {
1112     case FTYPE_CD:
1113         ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1114         if (ret == CDS_DISC_OK)
1115             return 1;
1116         else
1117             return 0;
1118         break;
1119     case FTYPE_FD:
1120         ret = fd_open(bs);
1121         return (ret >= 0);
1122     default:
1123         return 1;
1124     }
1125 }
1126
1127 /* currently only used by fdc.c, but a CD version would be good too */
1128 static int raw_media_changed(BlockDriverState *bs)
1129 {
1130     BDRVRawState *s = bs->opaque;
1131
1132     switch(s->type) {
1133     case FTYPE_FD:
1134         {
1135             int ret;
1136             /* XXX: we do not have a true media changed indication. It
1137                does not work if the floppy is changed without trying
1138                to read it */
1139             fd_open(bs);
1140             ret = s->fd_media_changed;
1141             s->fd_media_changed = 0;
1142 #ifdef DEBUG_FLOPPY
1143             printf("Floppy changed=%d\n", ret);
1144 #endif
1145             return ret;
1146         }
1147     default:
1148         return -ENOTSUP;
1149     }
1150 }
1151
1152 static int raw_eject(BlockDriverState *bs, int eject_flag)
1153 {
1154     BDRVRawState *s = bs->opaque;
1155
1156     switch(s->type) {
1157     case FTYPE_CD:
1158         if (eject_flag) {
1159             if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
1160                 perror("CDROMEJECT");
1161         } else {
1162             if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
1163                 perror("CDROMEJECT");
1164         }
1165         break;
1166     case FTYPE_FD:
1167         {
1168             int fd;
1169             if (s->fd >= 0) {
1170                 close(s->fd);
1171                 s->fd = -1;
1172             }
1173             fd = open(bs->filename, s->fd_open_flags | O_NONBLOCK);
1174             if (fd >= 0) {
1175                 if (ioctl(fd, FDEJECT, 0) < 0)
1176                     perror("FDEJECT");
1177                 close(fd);
1178             }
1179         }
1180         break;
1181     default:
1182         return -ENOTSUP;
1183     }
1184     return 0;
1185 }
1186
1187 static int raw_set_locked(BlockDriverState *bs, int locked)
1188 {
1189     BDRVRawState *s = bs->opaque;
1190
1191     switch(s->type) {
1192     case FTYPE_CD:
1193         if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
1194             /* Note: an error can happen if the distribution automatically
1195                mounts the CD-ROM */
1196             //        perror("CDROM_LOCKDOOR");
1197         }
1198         break;
1199     default:
1200         return -ENOTSUP;
1201     }
1202     return 0;
1203 }
1204
1205 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1206 {
1207     BDRVRawState *s = bs->opaque;
1208
1209     return ioctl(s->fd, req, buf);
1210 }
1211
1212 #ifdef CONFIG_AIO
1213 static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
1214         unsigned long int req, void *buf,
1215         BlockDriverCompletionFunc *cb, void *opaque)
1216 {
1217     RawAIOCB *acb;
1218
1219     acb = raw_aio_setup(bs, 0, buf, 0, cb, opaque);
1220     if (!acb)
1221         return NULL;
1222
1223     acb->aiocb.aio_ioctl_cmd = req;
1224     if (qemu_paio_ioctl(&acb->aiocb) < 0) {
1225         raw_aio_remove(acb);
1226         return NULL;
1227     }
1228
1229     return &acb->common;
1230 }
1231 #endif
1232
1233 #elif defined(__FreeBSD__)
1234
1235 static int fd_open(BlockDriverState *bs)
1236 {
1237     BDRVRawState *s = bs->opaque;
1238
1239     /* this is just to ensure s->fd is sane (its called by io ops) */
1240     if (s->fd >= 0)
1241         return 0;
1242     return -EIO;
1243 }
1244
1245 static int cd_open(BlockDriverState *bs)
1246 {
1247 #if defined(__FreeBSD__)
1248     BDRVRawState *s = bs->opaque;
1249     int fd;
1250
1251     switch(s->type) {
1252     case FTYPE_CD:
1253         /* XXX force reread of possibly changed/newly loaded disc,
1254          * FreeBSD seems to not notice sometimes... */
1255         if (s->fd >= 0)
1256             close (s->fd);
1257         fd = open(bs->filename, s->cd_open_flags, 0644);
1258         if (fd < 0) {
1259             s->fd = -1;
1260             return -EIO;
1261         }
1262         s->fd = fd;
1263         /* make sure the door isnt locked at this time */
1264         ioctl (s->fd, CDIOCALLOW);
1265     }
1266 #endif
1267     return 0;
1268 }
1269
1270 static int raw_is_inserted(BlockDriverState *bs)
1271 {
1272     BDRVRawState *s = bs->opaque;
1273
1274     switch(s->type) {
1275     case FTYPE_CD:
1276         return (raw_getlength(bs) > 0);
1277     case FTYPE_FD:
1278         /* XXX handle this */
1279         /* FALLTHRU */
1280     default:
1281         return 1;
1282     }
1283 }
1284
1285 static int raw_media_changed(BlockDriverState *bs)
1286 {
1287     return -ENOTSUP;
1288 }
1289
1290 static int raw_eject(BlockDriverState *bs, int eject_flag)
1291 {
1292     BDRVRawState *s = bs->opaque;
1293
1294     switch(s->type) {
1295     case FTYPE_CD:
1296         if (s->fd < 0)
1297             return -ENOTSUP;
1298         (void) ioctl (s->fd, CDIOCALLOW);
1299         if (eject_flag) {
1300             if (ioctl (s->fd, CDIOCEJECT) < 0)
1301                 perror("CDIOCEJECT");
1302         } else {
1303             if (ioctl (s->fd, CDIOCCLOSE) < 0)
1304                 perror("CDIOCCLOSE");
1305         }
1306         if (cd_open(bs) < 0)
1307             return -ENOTSUP;
1308         break;
1309     case FTYPE_FD:
1310         /* XXX handle this */
1311         /* FALLTHRU */
1312     default:
1313         return -ENOTSUP;
1314     }
1315     return 0;
1316 }
1317
1318 static int raw_set_locked(BlockDriverState *bs, int locked)
1319 {
1320     BDRVRawState *s = bs->opaque;
1321
1322     switch(s->type) {
1323     case FTYPE_CD:
1324         if (s->fd < 0)
1325             return -ENOTSUP;
1326         if (ioctl (s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
1327             /* Note: an error can happen if the distribution automatically
1328                mounts the CD-ROM */
1329             //        perror("CDROM_LOCKDOOR");
1330         }
1331         break;
1332     default:
1333         return -ENOTSUP;
1334     }
1335     return 0;
1336 }
1337
1338 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1339 {
1340     return -ENOTSUP;
1341 }
1342 #else /* !linux && !FreeBSD */
1343
1344 static int fd_open(BlockDriverState *bs)
1345 {
1346     return 0;
1347 }
1348
1349 static int raw_is_inserted(BlockDriverState *bs)
1350 {
1351     return 1;
1352 }
1353
1354 static int raw_media_changed(BlockDriverState *bs)
1355 {
1356     return -ENOTSUP;
1357 }
1358
1359 static int raw_eject(BlockDriverState *bs, int eject_flag)
1360 {
1361     return -ENOTSUP;
1362 }
1363
1364 static int raw_set_locked(BlockDriverState *bs, int locked)
1365 {
1366     return -ENOTSUP;
1367 }
1368
1369 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1370 {
1371     return -ENOTSUP;
1372 }
1373
1374 static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
1375         unsigned long int req, void *buf,
1376         BlockDriverCompletionFunc *cb, void *opaque)
1377 {
1378     return NULL;
1379 }
1380 #endif /* !linux && !FreeBSD */
1381
1382 #if defined(__linux__) || defined(__FreeBSD__)
1383 static int hdev_create(const char *filename, int64_t total_size,
1384                        const char *backing_file, int flags)
1385 {
1386     int fd;
1387     int ret = 0;
1388     struct stat stat_buf;
1389
1390     if (flags || backing_file)
1391         return -ENOTSUP;
1392
1393     fd = open(filename, O_WRONLY | O_BINARY);
1394     if (fd < 0)
1395         return -EIO;
1396
1397     if (fstat(fd, &stat_buf) < 0)
1398         ret = -EIO;
1399     else if (!S_ISBLK(stat_buf.st_mode))
1400         ret = -EIO;
1401     else if (lseek(fd, 0, SEEK_END) < total_size * 512)
1402         ret = -ENOSPC;
1403
1404     close(fd);
1405     return ret;
1406 }
1407
1408 #else  /* !(linux || freebsd) */
1409
1410 static int hdev_create(const char *filename, int64_t total_size,
1411                        const char *backing_file, int flags)
1412 {
1413     return -ENOTSUP;
1414 }
1415 #endif
1416
1417 BlockDriver bdrv_host_device = {
1418     .format_name        = "host_device",
1419     .instance_size      = sizeof(BDRVRawState),
1420     .bdrv_open          = hdev_open,
1421     .bdrv_close         = raw_close,
1422     .bdrv_create        = hdev_create,
1423     .bdrv_flush         = raw_flush,
1424
1425 #ifdef CONFIG_AIO
1426     .bdrv_aio_read      = raw_aio_read,
1427     .bdrv_aio_write     = raw_aio_write,
1428     .bdrv_aio_cancel    = raw_aio_cancel,
1429     .aiocb_size         = sizeof(RawAIOCB),
1430 #endif
1431
1432     .bdrv_read          = raw_read,
1433     .bdrv_write         = raw_write,
1434     .bdrv_getlength     = raw_getlength,
1435
1436     /* removable device support */
1437     .bdrv_is_inserted   = raw_is_inserted,
1438     .bdrv_media_changed = raw_media_changed,
1439     .bdrv_eject         = raw_eject,
1440     .bdrv_set_locked    = raw_set_locked,
1441     /* generic scsi device */
1442     .bdrv_ioctl         = raw_ioctl,
1443 #ifdef CONFIG_AIO
1444     .bdrv_aio_ioctl     = raw_aio_ioctl,
1445 #endif
1446 };