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 <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     "raw",
 880     sizeof(BDRVRawState),
 881     NULL, /* no probe for protocols */
 882     raw_open,
 883     NULL,
 884     NULL,
 885     raw_close,
 886     raw_create,
 887     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_read = raw_read,
 897     .bdrv_write = raw_write,
 898     .bdrv_truncate = raw_truncate,
 899     .bdrv_getlength = raw_getlength,
 900 };
 901
 902 /***********************************************/
 903 /* host device */
 904
 905 #ifdef CONFIG_COCOA
 906 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
 907 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
 908
 909 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
 910 {
 911     kern_return_t       kernResult;
 912     mach_port_t     masterPort;
 913     CFMutableDictionaryRef  classesToMatch;
 914
 915     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
 916     if ( KERN_SUCCESS != kernResult ) {
 917         printf( "IOMasterPort returned %d\n", kernResult );
 918     }
 919
 920     classesToMatch = IOServiceMatching( kIOCDMediaClass );
 921     if ( classesToMatch == NULL ) {
 922         printf( "IOServiceMatching returned a NULL dictionary.\n" );
 923     } else {
 924     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
 925     }
 926     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
 927     if ( KERN_SUCCESS != kernResult )
 928     {
 929         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
 930     }
 931
 932     return kernResult;
 933 }
 934
 935 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
 936 {
 937     io_object_t     nextMedia;
 938     kern_return_t   kernResult = KERN_FAILURE;
 939     *bsdPath = '\0';
 940     nextMedia = IOIteratorNext( mediaIterator );
 941     if ( nextMedia )
 942     {
 943         CFTypeRef   bsdPathAsCFString;
 944     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
 945         if ( bsdPathAsCFString ) {
 946             size_t devPathLength;
 947             strcpy( bsdPath, _PATH_DEV );
 948             strcat( bsdPath, "r" );
 949             devPathLength = strlen( bsdPath );
 950             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
 951                 kernResult = KERN_SUCCESS;
 952             }
 953             CFRelease( bsdPathAsCFString );
 954         }
 955         IOObjectRelease( nextMedia );
 956     }
 957
 958     return kernResult;
 959 }
 960
 961 #endif
 962
 963 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 964 {
 965     BDRVRawState *s = bs->opaque;
 966     int fd, open_flags, ret;
 967
 968     posix_aio_init();
 969
 970 #ifdef CONFIG_COCOA
 971     if (strstart(filename, "/dev/cdrom", NULL)) {
 972         kern_return_t kernResult;
 973         io_iterator_t mediaIterator;
 974         char bsdPath[ MAXPATHLEN ];
 975         int fd;
 976
 977         kernResult = FindEjectableCDMedia( &mediaIterator );
 978         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
 979
 980         if ( bsdPath[ 0 ] != '\0' ) {
 981             strcat(bsdPath,"s0");
 982             /* some CDs don't have a partition 0 */
 983             fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
 984             if (fd < 0) {
 985                 bsdPath[strlen(bsdPath)-1] = '1';
 986             } else {
 987                 close(fd);
 988             }
 989             filename = bsdPath;
 990         }
 991
 992         if ( mediaIterator )
 993             IOObjectRelease( mediaIterator );
 994     }
 995 #endif
 996     open_flags = O_BINARY;
 997     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 998         open_flags |= O_RDWR;
 999     } else {
1000         open_flags |= O_RDONLY;
1001         bs->read_only = 1;
1002     }
1003     /* Use O_DSYNC for write-through caching, no flags for write-back caching,
1004      * and O_DIRECT for no caching. */
1005     if ((flags & BDRV_O_NOCACHE))
1006         open_flags |= O_DIRECT;
1007     else if (!(flags & BDRV_O_CACHE_WB))
1008         open_flags |= O_DSYNC;
1009
1010     s->type = FTYPE_FILE;
1011 #if defined(__linux__)
1012     if (strstart(filename, "/dev/cd", NULL)) {
1013         /* open will not fail even if no CD is inserted */
1014         open_flags |= O_NONBLOCK;
1015         s->type = FTYPE_CD;
1016     } else if (strstart(filename, "/dev/fd", NULL)) {
1017         s->type = FTYPE_FD;
1018         s->fd_open_flags = open_flags;
1019         /* open will not fail even if no floppy is inserted */
1020         open_flags |= O_NONBLOCK;
1021 #ifdef CONFIG_AIO
1022     } else if (strstart(filename, "/dev/sg", NULL)) {
1023         bs->sg = 1;
1024 #endif
1025     }
1026 #endif
1027 #if defined(__FreeBSD__)
1028     if (strstart(filename, "/dev/cd", NULL) ||
1029         strstart(filename, "/dev/acd", NULL)) {
1030         s->type = FTYPE_CD;
1031         s->cd_open_flags = open_flags;
1032     }
1033 #endif
1034     s->fd = -1;
1035     fd = open(filename, open_flags, 0644);
1036     if (fd < 0) {
1037         ret = -errno;
1038         if (ret == -EROFS)
1039             ret = -EACCES;
1040         return ret;
1041     }
1042     s->fd = fd;
1043 #if defined(__FreeBSD__)
1044     /* make sure the door isnt locked at this time */
1045     if (s->type == FTYPE_CD)
1046         ioctl (s->fd, CDIOCALLOW);
1047 #endif
1048 #if defined(__linux__)
1049     /* close fd so that we can reopen it as needed */
1050     if (s->type == FTYPE_FD) {
1051         close(s->fd);
1052         s->fd = -1;
1053         s->fd_media_changed = 1;
1054     }
1055 #endif
1056     return 0;
1057 }
1058
1059 #if defined(__linux__)
1060 /* Note: we do not have a reliable method to detect if the floppy is
1061    present. The current method is to try to open the floppy at every
1062    I/O and to keep it opened during a few hundreds of ms. */
1063 static int fd_open(BlockDriverState *bs)
1064 {
1065     BDRVRawState *s = bs->opaque;
1066     int last_media_present;
1067
1068     if (s->type != FTYPE_FD)
1069         return 0;
1070     last_media_present = (s->fd >= 0);
1071     if (s->fd >= 0 &&
1072         (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
1073         close(s->fd);
1074         s->fd = -1;
1075 #ifdef DEBUG_FLOPPY
1076         printf("Floppy closed\n");
1077 #endif
1078     }
1079     if (s->fd < 0) {
1080         if (s->fd_got_error &&
1081             (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
1082 #ifdef DEBUG_FLOPPY
1083             printf("No floppy (open delayed)\n");
1084 #endif
1085             return -EIO;
1086         }
1087         s->fd = open(bs->filename, s->fd_open_flags);
1088         if (s->fd < 0) {
1089             s->fd_error_time = qemu_get_clock(rt_clock);
1090             s->fd_got_error = 1;
1091             if (last_media_present)
1092                 s->fd_media_changed = 1;
1093 #ifdef DEBUG_FLOPPY
1094             printf("No floppy\n");
1095 #endif
1096             return -EIO;
1097         }
1098 #ifdef DEBUG_FLOPPY
1099         printf("Floppy opened\n");
1100 #endif
1101     }
1102     if (!last_media_present)
1103         s->fd_media_changed = 1;
1104     s->fd_open_time = qemu_get_clock(rt_clock);
1105     s->fd_got_error = 0;
1106     return 0;
1107 }
1108
1109 static int raw_is_inserted(BlockDriverState *bs)
1110 {
1111     BDRVRawState *s = bs->opaque;
1112     int ret;
1113
1114     switch(s->type) {
1115     case FTYPE_CD:
1116         ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1117         if (ret == CDS_DISC_OK)
1118             return 1;
1119         else
1120             return 0;
1121         break;
1122     case FTYPE_FD:
1123         ret = fd_open(bs);
1124         return (ret >= 0);
1125     default:
1126         return 1;
1127     }
1128 }
1129
1130 /* currently only used by fdc.c, but a CD version would be good too */
1131 static int raw_media_changed(BlockDriverState *bs)
1132 {
1133     BDRVRawState *s = bs->opaque;
1134
1135     switch(s->type) {
1136     case FTYPE_FD:
1137         {
1138             int ret;
1139             /* XXX: we do not have a true media changed indication. It
1140                does not work if the floppy is changed without trying
1141                to read it */
1142             fd_open(bs);
1143             ret = s->fd_media_changed;
1144             s->fd_media_changed = 0;
1145 #ifdef DEBUG_FLOPPY
1146             printf("Floppy changed=%d\n", ret);
1147 #endif
1148             return ret;
1149         }
1150     default:
1151         return -ENOTSUP;
1152     }
1153 }
1154
1155 static int raw_eject(BlockDriverState *bs, int eject_flag)
1156 {
1157     BDRVRawState *s = bs->opaque;
1158
1159     switch(s->type) {
1160     case FTYPE_CD:
1161         if (eject_flag) {
1162             if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
1163                 perror("CDROMEJECT");
1164         } else {
1165             if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
1166                 perror("CDROMEJECT");
1167         }
1168         break;
1169     case FTYPE_FD:
1170         {
1171             int fd;
1172             if (s->fd >= 0) {
1173                 close(s->fd);
1174                 s->fd = -1;
1175             }
1176             fd = open(bs->filename, s->fd_open_flags | O_NONBLOCK);
1177             if (fd >= 0) {
1178                 if (ioctl(fd, FDEJECT, 0) < 0)
1179                     perror("FDEJECT");
1180                 close(fd);
1181             }
1182         }
1183         break;
1184     default:
1185         return -ENOTSUP;
1186     }
1187     return 0;
1188 }
1189
1190 static int raw_set_locked(BlockDriverState *bs, int locked)
1191 {
1192     BDRVRawState *s = bs->opaque;
1193
1194     switch(s->type) {
1195     case FTYPE_CD:
1196         if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
1197             /* Note: an error can happen if the distribution automatically
1198                mounts the CD-ROM */
1199             //        perror("CDROM_LOCKDOOR");
1200         }
1201         break;
1202     default:
1203         return -ENOTSUP;
1204     }
1205     return 0;
1206 }
1207
1208 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1209 {
1210     BDRVRawState *s = bs->opaque;
1211
1212     return ioctl(s->fd, req, buf);
1213 }
1214
1215 #ifdef CONFIG_AIO
1216 static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
1217         unsigned long int req, void *buf,
1218         BlockDriverCompletionFunc *cb, void *opaque)
1219 {
1220     RawAIOCB *acb;
1221
1222     acb = raw_aio_setup(bs, 0, buf, 0, cb, opaque);
1223     if (!acb)
1224         return NULL;
1225
1226     acb->aiocb.aio_ioctl_cmd = req;
1227     if (qemu_paio_ioctl(&acb->aiocb) < 0) {
1228         raw_aio_remove(acb);
1229         return NULL;
1230     }
1231
1232     return &acb->common;
1233 }
1234 #endif
1235
1236 #elif defined(__FreeBSD__)
1237
1238 static int fd_open(BlockDriverState *bs)
1239 {
1240     BDRVRawState *s = bs->opaque;
1241
1242     /* this is just to ensure s->fd is sane (its called by io ops) */
1243     if (s->fd >= 0)
1244         return 0;
1245     return -EIO;
1246 }
1247
1248 static int cd_open(BlockDriverState *bs)
1249 {
1250 #if defined(__FreeBSD__)
1251     BDRVRawState *s = bs->opaque;
1252     int fd;
1253
1254     switch(s->type) {
1255     case FTYPE_CD:
1256         /* XXX force reread of possibly changed/newly loaded disc,
1257          * FreeBSD seems to not notice sometimes... */
1258         if (s->fd >= 0)
1259             close (s->fd);
1260         fd = open(bs->filename, s->cd_open_flags, 0644);
1261         if (fd < 0) {
1262             s->fd = -1;
1263             return -EIO;
1264         }
1265         s->fd = fd;
1266         /* make sure the door isnt locked at this time */
1267         ioctl (s->fd, CDIOCALLOW);
1268     }
1269 #endif
1270     return 0;
1271 }
1272
1273 static int raw_is_inserted(BlockDriverState *bs)
1274 {
1275     BDRVRawState *s = bs->opaque;
1276
1277     switch(s->type) {
1278     case FTYPE_CD:
1279         return (raw_getlength(bs) > 0);
1280     case FTYPE_FD:
1281         /* XXX handle this */
1282         /* FALLTHRU */
1283     default:
1284         return 1;
1285     }
1286 }
1287
1288 static int raw_media_changed(BlockDriverState *bs)
1289 {
1290     return -ENOTSUP;
1291 }
1292
1293 static int raw_eject(BlockDriverState *bs, int eject_flag)
1294 {
1295     BDRVRawState *s = bs->opaque;
1296
1297     switch(s->type) {
1298     case FTYPE_CD:
1299         if (s->fd < 0)
1300             return -ENOTSUP;
1301         (void) ioctl (s->fd, CDIOCALLOW);
1302         if (eject_flag) {
1303             if (ioctl (s->fd, CDIOCEJECT) < 0)
1304                 perror("CDIOCEJECT");
1305         } else {
1306             if (ioctl (s->fd, CDIOCCLOSE) < 0)
1307                 perror("CDIOCCLOSE");
1308         }
1309         if (cd_open(bs) < 0)
1310             return -ENOTSUP;
1311         break;
1312     case FTYPE_FD:
1313         /* XXX handle this */
1314         /* FALLTHRU */
1315     default:
1316         return -ENOTSUP;
1317     }
1318     return 0;
1319 }
1320
1321 static int raw_set_locked(BlockDriverState *bs, int locked)
1322 {
1323     BDRVRawState *s = bs->opaque;
1324
1325     switch(s->type) {
1326     case FTYPE_CD:
1327         if (s->fd < 0)
1328             return -ENOTSUP;
1329         if (ioctl (s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
1330             /* Note: an error can happen if the distribution automatically
1331                mounts the CD-ROM */
1332             //        perror("CDROM_LOCKDOOR");
1333         }
1334         break;
1335     default:
1336         return -ENOTSUP;
1337     }
1338     return 0;
1339 }
1340
1341 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1342 {
1343     return -ENOTSUP;
1344 }
1345 #else /* !linux && !FreeBSD */
1346
1347 static int fd_open(BlockDriverState *bs)
1348 {
1349     return 0;
1350 }
1351
1352 static int raw_is_inserted(BlockDriverState *bs)
1353 {
1354     return 1;
1355 }
1356
1357 static int raw_media_changed(BlockDriverState *bs)
1358 {
1359     return -ENOTSUP;
1360 }
1361
1362 static int raw_eject(BlockDriverState *bs, int eject_flag)
1363 {
1364     return -ENOTSUP;
1365 }
1366
1367 static int raw_set_locked(BlockDriverState *bs, int locked)
1368 {
1369     return -ENOTSUP;
1370 }
1371
1372 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1373 {
1374     return -ENOTSUP;
1375 }
1376
1377 static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
1378         unsigned long int req, void *buf,
1379         BlockDriverCompletionFunc *cb, void *opaque)
1380 {
1381     return NULL;
1382 }
1383 #endif /* !linux && !FreeBSD */
1384
1385 #if defined(__linux__) || defined(__FreeBSD__)
1386 static int hdev_create(const char *filename, int64_t total_size,
1387                        const char *backing_file, int flags)
1388 {
1389     int fd;
1390     int ret = 0;
1391     struct stat stat_buf;
1392
1393     if (flags || backing_file)
1394         return -ENOTSUP;
1395
1396     fd = open(filename, O_WRONLY | O_BINARY);
1397     if (fd < 0)
1398         return -EIO;
1399
1400     if (fstat(fd, &stat_buf) < 0)
1401         ret = -EIO;
1402     else if (!S_ISBLK(stat_buf.st_mode))
1403         ret = -EIO;
1404     else if (lseek(fd, 0, SEEK_END) < total_size * 512)
1405         ret = -ENOSPC;
1406
1407     close(fd);
1408     return ret;
1409 }
1410
1411 #else  /* !(linux || freebsd) */
1412
1413 static int hdev_create(const char *filename, int64_t total_size,
1414                        const char *backing_file, int flags)
1415 {
1416     return -ENOTSUP;
1417 }
1418 #endif
1419
1420 BlockDriver bdrv_host_device = {
1421     .format_name        = "host_device",
1422     .instance_size      = sizeof(BDRVRawState),
1423     .bdrv_open          = hdev_open,
1424     .bdrv_close         = raw_close,
1425     .bdrv_create        = hdev_create,
1426     .bdrv_flush         = raw_flush,
1427
1428 #ifdef CONFIG_AIO
1429     .bdrv_aio_read      = raw_aio_read,
1430     .bdrv_aio_write     = raw_aio_write,
1431     .bdrv_aio_cancel    = raw_aio_cancel,
1432     .aiocb_size         = sizeof(RawAIOCB),
1433 #endif
1434
1435     .bdrv_read          = raw_read,
1436     .bdrv_write         = raw_write,
1437     .bdrv_getlength     = raw_getlength,
1438
1439     /* removable device support */
1440     .bdrv_is_inserted   = raw_is_inserted,
1441     .bdrv_media_changed = raw_media_changed,
1442     .bdrv_eject         = raw_eject,
1443     .bdrv_set_locked    = raw_set_locked,
1444     /* generic scsi device */
1445     .bdrv_ioctl         = raw_ioctl,
1446 #ifdef CONFIG_AIO
1447     .bdrv_aio_ioctl     = raw_aio_ioctl,
1448 #endif
1449 };