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 #endif
  59
  60 #ifdef __OpenBSD__
  61 #include <sys/ioctl.h>
  62 #include <sys/disklabel.h>
  63 #include <sys/dkio.h>
  64 #endif
  65
  66 #ifdef __DragonFly__
  67 #include <sys/ioctl.h>
  68 #include <sys/diskslice.h>
  69 #endif
  70
  71 //#define DEBUG_FLOPPY
  72
  73 //#define DEBUG_BLOCK
  74 #if defined(DEBUG_BLOCK)
  75 #define DEBUG_BLOCK_PRINT(formatCstr, args...) do { if (qemu_log_enabled())     \
  76     { qemu_log(formatCstr, ##args); qemu_log_flush(); } } while (0)
  77 #else
  78 #define DEBUG_BLOCK_PRINT(formatCstr, args...)
  79 #endif
  80
  81 /* OS X does not have O_DSYNC */
  82 #ifndef O_DSYNC
  83 #define O_DSYNC O_SYNC
  84 #endif
  85
  86 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
  87 #ifndef O_DIRECT
  88 #define O_DIRECT O_DSYNC
  89 #endif
  90
  91 #define FTYPE_FILE   0
  92 #define FTYPE_CD     1
  93 #define FTYPE_FD     2
  94
  95 #define ALIGNED_BUFFER_SIZE (32 * 512)
  96
  97 /* if the FD is not accessed during that time (in ms), we try to
  98    reopen it to see if the disk has been changed */
  99 #define FD_OPEN_TIMEOUT 1000
 100
 101 typedef struct BDRVRawState {
 102     int fd;
 103     int type;
 104     unsigned int lseek_err_cnt;
 105 #if defined(__linux__)
 106     /* linux floppy specific */
 107     int fd_open_flags;
 108     int64_t fd_open_time;
 109     int64_t fd_error_time;
 110     int fd_got_error;
 111     int fd_media_changed;
 112 #endif
 113     uint8_t* aligned_buf;
 114 } BDRVRawState;
 115
 116 static int posix_aio_init(void);
 117
 118 static int fd_open(BlockDriverState *bs);
 119
 120 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
 121 {
 122     BDRVRawState *s = bs->opaque;
 123     int fd, open_flags, ret;
 124
 125     posix_aio_init();
 126
 127     s->lseek_err_cnt = 0;
 128
 129     open_flags = O_BINARY;
 130     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 131         open_flags |= O_RDWR;
 132     } else {
 133         open_flags |= O_RDONLY;
 134         bs->read_only = 1;
 135     }
 136     if (flags & BDRV_O_CREAT)
 137         open_flags |= O_CREAT | O_TRUNC;
 138
 139     /* Use O_DSYNC for write-through caching, no flags for write-back caching,
 140      * and O_DIRECT for no caching. */
 141     if ((flags & BDRV_O_NOCACHE))
 142         open_flags |= O_DIRECT;
 143     else if (!(flags & BDRV_O_CACHE_WB))
 144         open_flags |= O_DSYNC;
 145
 146     s->type = FTYPE_FILE;
 147
 148     fd = open(filename, open_flags, 0644);
 149     if (fd < 0) {
 150         ret = -errno;
 151         if (ret == -EROFS)
 152             ret = -EACCES;
 153         return ret;
 154     }
 155     s->fd = fd;
 156     s->aligned_buf = NULL;
 157     if ((flags & BDRV_O_NOCACHE)) {
 158         s->aligned_buf = qemu_memalign(512, ALIGNED_BUFFER_SIZE);
 159         if (s->aligned_buf == NULL) {
 160             ret = -errno;
 161             close(fd);
 162             return ret;
 163         }
 164     }
 165     return 0;
 166 }
 167
 168 /* XXX: use host sector size if necessary with:
 169 #ifdef DIOCGSECTORSIZE
 170         {
 171             unsigned int sectorsize = 512;
 172             if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
 173                 sectorsize > bufsize)
 174                 bufsize = sectorsize;
 175         }
 176 #endif
 177 #ifdef CONFIG_COCOA
 178         u_int32_t   blockSize = 512;
 179         if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
 180             bufsize = blockSize;
 181         }
 182 #endif
 183 */
 184
 185 /*
 186  * offset and count are in bytes, but must be multiples of 512 for files
 187  * opened with O_DIRECT. buf must be aligned to 512 bytes then.
 188  *
 189  * This function may be called without alignment if the caller ensures
 190  * that O_DIRECT is not in effect.
 191  */
 192 static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
 193                      uint8_t *buf, int count)
 194 {
 195     BDRVRawState *s = bs->opaque;
 196     int ret;
 197
 198     ret = fd_open(bs);
 199     if (ret < 0)
 200         return ret;
 201
 202     if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
 203         ++(s->lseek_err_cnt);
 204         if(s->lseek_err_cnt <= 10) {
 205             DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 206                               "] lseek failed : %d = %s\n",
 207                               s->fd, bs->filename, offset, buf, count,
 208                               bs->total_sectors, errno, strerror(errno));
 209         }
 210         return -1;
 211     }
 212     s->lseek_err_cnt=0;
 213
 214     ret = read(s->fd, buf, count);
 215     if (ret == count)
 216         goto label__raw_read__success;
 217
 218     DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 219                       "] read failed %d : %d = %s\n",
 220                       s->fd, bs->filename, offset, buf, count,
 221                       bs->total_sectors, ret, errno, strerror(errno));
 222
 223     /* Try harder for CDrom. */
 224     if (bs->type == BDRV_TYPE_CDROM) {
 225         lseek(s->fd, offset, SEEK_SET);
 226         ret = read(s->fd, buf, count);
 227         if (ret == count)
 228             goto label__raw_read__success;
 229         lseek(s->fd, offset, SEEK_SET);
 230         ret = read(s->fd, buf, count);
 231         if (ret == count)
 232             goto label__raw_read__success;
 233
 234         DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 235                           "] retry read failed %d : %d = %s\n",
 236                           s->fd, bs->filename, offset, buf, count,
 237                           bs->total_sectors, ret, errno, strerror(errno));
 238     }
 239
 240 label__raw_read__success:
 241
 242     return ret;
 243 }
 244
 245 /*
 246  * offset and count are in bytes, but must be multiples of 512 for files
 247  * opened with O_DIRECT. buf must be aligned to 512 bytes then.
 248  *
 249  * This function may be called without alignment if the caller ensures
 250  * that O_DIRECT is not in effect.
 251  */
 252 static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
 253                       const uint8_t *buf, int count)
 254 {
 255     BDRVRawState *s = bs->opaque;
 256     int ret;
 257
 258     ret = fd_open(bs);
 259     if (ret < 0)
 260         return -errno;
 261
 262     if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
 263         ++(s->lseek_err_cnt);
 264         if(s->lseek_err_cnt) {
 265             DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%"
 266                               PRId64 "] lseek failed : %d = %s\n",
 267                               s->fd, bs->filename, offset, buf, count,
 268                               bs->total_sectors, errno, strerror(errno));
 269         }
 270         return -EIO;
 271     }
 272     s->lseek_err_cnt = 0;
 273
 274     ret = write(s->fd, buf, count);
 275     if (ret == count)
 276         goto label__raw_write__success;
 277
 278     DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 279                       "] write failed %d : %d = %s\n",
 280                       s->fd, bs->filename, offset, buf, count,
 281                       bs->total_sectors, ret, errno, strerror(errno));
 282
 283 label__raw_write__success:
 284
 285     return  (ret < 0) ? -errno : ret;
 286 }
 287
 288
 289 /*
 290  * offset and count are in bytes and possibly not aligned. For files opened
 291  * with O_DIRECT, necessary alignments are ensured before calling
 292  * raw_pread_aligned to do the actual read.
 293  */
 294 static int raw_pread(BlockDriverState *bs, int64_t offset,
 295                      uint8_t *buf, int count)
 296 {
 297     BDRVRawState *s = bs->opaque;
 298     int size, ret, shift, sum;
 299
 300     sum = 0;
 301
 302     if (s->aligned_buf != NULL)  {
 303
 304         if (offset & 0x1ff) {
 305             /* align offset on a 512 bytes boundary */
 306
 307             shift = offset & 0x1ff;
 308             size = (shift + count + 0x1ff) & ~0x1ff;
 309             if (size > ALIGNED_BUFFER_SIZE)
 310                 size = ALIGNED_BUFFER_SIZE;
 311             ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size);
 312             if (ret < 0)
 313                 return ret;
 314
 315             size = 512 - shift;
 316             if (size > count)
 317                 size = count;
 318             memcpy(buf, s->aligned_buf + shift, size);
 319
 320             buf += size;
 321             offset += size;
 322             count -= size;
 323             sum += size;
 324
 325             if (count == 0)
 326                 return sum;
 327         }
 328         if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
 329
 330             /* read on aligned buffer */
 331
 332             while (count) {
 333
 334                 size = (count + 0x1ff) & ~0x1ff;
 335                 if (size > ALIGNED_BUFFER_SIZE)
 336                     size = ALIGNED_BUFFER_SIZE;
 337
 338                 ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
 339                 if (ret < 0)
 340                     return ret;
 341
 342                 size = ret;
 343                 if (size > count)
 344                     size = count;
 345
 346                 memcpy(buf, s->aligned_buf, size);
 347
 348                 buf += size;
 349                 offset += size;
 350                 count -= size;
 351                 sum += size;
 352             }
 353
 354             return sum;
 355         }
 356     }
 357
 358     return raw_pread_aligned(bs, offset, buf, count) + sum;
 359 }
 360
 361 static int raw_read(BlockDriverState *bs, int64_t sector_num,
 362                     uint8_t *buf, int nb_sectors)
 363 {
 364     int ret;
 365
 366     ret = raw_pread(bs, sector_num * 512, buf, nb_sectors * 512);
 367     if (ret == (nb_sectors * 512))
 368         ret = 0;
 369     return ret;
 370 }
 371
 372 /*
 373  * offset and count are in bytes and possibly not aligned. For files opened
 374  * with O_DIRECT, necessary alignments are ensured before calling
 375  * raw_pwrite_aligned to do the actual write.
 376  */
 377 static int raw_pwrite(BlockDriverState *bs, int64_t offset,
 378                       const uint8_t *buf, int count)
 379 {
 380     BDRVRawState *s = bs->opaque;
 381     int size, ret, shift, sum;
 382
 383     sum = 0;
 384
 385     if (s->aligned_buf != NULL) {
 386
 387         if (offset & 0x1ff) {
 388             /* align offset on a 512 bytes boundary */
 389             shift = offset & 0x1ff;
 390             ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, 512);
 391             if (ret < 0)
 392                 return ret;
 393
 394             size = 512 - shift;
 395             if (size > count)
 396                 size = count;
 397             memcpy(s->aligned_buf + shift, buf, size);
 398
 399             ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf, 512);
 400             if (ret < 0)
 401                 return ret;
 402
 403             buf += size;
 404             offset += size;
 405             count -= size;
 406             sum += size;
 407
 408             if (count == 0)
 409                 return sum;
 410         }
 411         if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
 412
 413             while ((size = (count & ~0x1ff)) != 0) {
 414
 415                 if (size > ALIGNED_BUFFER_SIZE)
 416                     size = ALIGNED_BUFFER_SIZE;
 417
 418                 memcpy(s->aligned_buf, buf, size);
 419
 420                 ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size);
 421                 if (ret < 0)
 422                     return ret;
 423
 424                 buf += ret;
 425                 offset += ret;
 426                 count -= ret;
 427                 sum += ret;
 428             }
 429             /* here, count < 512 because (count & ~0x1ff) == 0 */
 430             if (count) {
 431                 ret = raw_pread_aligned(bs, offset, s->aligned_buf, 512);
 432                 if (ret < 0)
 433                     return ret;
 434                  memcpy(s->aligned_buf, buf, count);
 435
 436                  ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, 512);
 437                  if (ret < 0)
 438                      return ret;
 439                  if (count < ret)
 440                      ret = count;
 441
 442                  sum += ret;
 443             }
 444             return sum;
 445         }
 446     }
 447     return raw_pwrite_aligned(bs, offset, buf, count) + sum;
 448 }
 449
 450 static int raw_write(BlockDriverState *bs, int64_t sector_num,
 451                      const uint8_t *buf, int nb_sectors)
 452 {
 453     int ret;
 454     ret = raw_pwrite(bs, sector_num * 512, buf, nb_sectors * 512);
 455     if (ret == (nb_sectors * 512))
 456         ret = 0;
 457     return ret;
 458 }
 459
 460 #ifdef CONFIG_AIO
 461 /***********************************************************/
 462 /* Unix AIO using POSIX AIO */
 463
 464 typedef struct RawAIOCB {
 465     BlockDriverAIOCB common;
 466     struct qemu_paiocb aiocb;
 467     struct RawAIOCB *next;
 468     int ret;
 469 } RawAIOCB;
 470
 471 typedef struct PosixAioState
 472 {
 473     int rfd, wfd;
 474     RawAIOCB *first_aio;
 475 } PosixAioState;
 476
 477 static void posix_aio_read(void *opaque)
 478 {
 479     PosixAioState *s = opaque;
 480     RawAIOCB *acb, **pacb;
 481     int ret;
 482     ssize_t len;
 483
 484     /* read all bytes from signal pipe */
 485     for (;;) {
 486         char bytes[16];
 487
 488         len = read(s->rfd, bytes, sizeof(bytes));
 489         if (len == -1 && errno == EINTR)
 490             continue; /* try again */
 491         if (len == sizeof(bytes))
 492             continue; /* more to read */
 493         break;
 494     }
 495
 496     for(;;) {
 497         pacb = &s->first_aio;
 498         for(;;) {
 499             acb = *pacb;
 500             if (!acb)
 501                 goto the_end;
 502             ret = qemu_paio_error(&acb->aiocb);
 503             if (ret == ECANCELED) {
 504                 /* remove the request */
 505                 *pacb = acb->next;
 506                 qemu_aio_release(acb);
 507             } else if (ret != EINPROGRESS) {
 508                 /* end of aio */
 509                 if (ret == 0) {
 510                     ret = qemu_paio_return(&acb->aiocb);
 511                     if (ret == acb->aiocb.aio_nbytes)
 512                         ret = 0;
 513                     else
 514                         ret = -EINVAL;
 515                 } else {
 516                     ret = -ret;
 517                 }
 518                 /* remove the request */
 519                 *pacb = acb->next;
 520                 /* call the callback */
 521                 acb->common.cb(acb->common.opaque, ret);
 522                 qemu_aio_release(acb);
 523                 break;
 524             } else {
 525                 pacb = &acb->next;
 526             }
 527         }
 528     }
 529  the_end: ;
 530 }
 531
 532 static int posix_aio_flush(void *opaque)
 533 {
 534     PosixAioState *s = opaque;
 535     return !!s->first_aio;
 536 }
 537
 538 static PosixAioState *posix_aio_state;
 539
 540 static void aio_signal_handler(int signum)
 541 {
 542     if (posix_aio_state) {
 543         char byte = 0;
 544
 545         write(posix_aio_state->wfd, &byte, sizeof(byte));
 546     }
 547
 548     qemu_service_io();
 549 }
 550
 551 static int posix_aio_init(void)
 552 {
 553     struct sigaction act;
 554     PosixAioState *s;
 555     int fds[2];
 556     struct qemu_paioinit ai;
 557
 558     if (posix_aio_state)
 559         return 0;
 560
 561     s = qemu_malloc(sizeof(PosixAioState));
 562
 563     sigfillset(&act.sa_mask);
 564     act.sa_flags = 0; /* do not restart syscalls to interrupt select() */
 565     act.sa_handler = aio_signal_handler;
 566     sigaction(SIGUSR2, &act, NULL);
 567
 568     s->first_aio = NULL;
 569     if (pipe(fds) == -1) {
 570         fprintf(stderr, "failed to create pipe\n");
 571         return -errno;
 572     }
 573
 574     s->rfd = fds[0];
 575     s->wfd = fds[1];
 576
 577     fcntl(s->rfd, F_SETFL, O_NONBLOCK);
 578     fcntl(s->wfd, F_SETFL, O_NONBLOCK);
 579
 580     qemu_aio_set_fd_handler(s->rfd, posix_aio_read, NULL, posix_aio_flush, s);
 581
 582     memset(&ai, 0, sizeof(ai));
 583     ai.aio_threads = 64;
 584     ai.aio_num = 64;
 585     qemu_paio_init(&ai);
 586
 587     posix_aio_state = s;
 588
 589     return 0;
 590 }
 591
 592 static RawAIOCB *raw_aio_setup(BlockDriverState *bs,
 593         int64_t sector_num, uint8_t *buf, int nb_sectors,
 594         BlockDriverCompletionFunc *cb, void *opaque)
 595 {
 596     BDRVRawState *s = bs->opaque;
 597     RawAIOCB *acb;
 598
 599     if (fd_open(bs) < 0)
 600         return NULL;
 601
 602     acb = qemu_aio_get(bs, cb, opaque);
 603     if (!acb)
 604         return NULL;
 605     acb->aiocb.aio_fildes = s->fd;
 606     acb->aiocb.ev_signo = SIGUSR2;
 607     acb->aiocb.aio_buf = buf;
 608     if (nb_sectors < 0)
 609         acb->aiocb.aio_nbytes = -nb_sectors;
 610     else
 611         acb->aiocb.aio_nbytes = nb_sectors * 512;
 612     acb->aiocb.aio_offset = sector_num * 512;
 613     acb->next = posix_aio_state->first_aio;
 614     posix_aio_state->first_aio = acb;
 615     return acb;
 616 }
 617
 618 static void raw_aio_em_cb(void* opaque)
 619 {
 620     RawAIOCB *acb = opaque;
 621     acb->common.cb(acb->common.opaque, acb->ret);
 622     qemu_aio_release(acb);
 623 }
 624
 625 static void raw_aio_remove(RawAIOCB *acb)
 626 {
 627     RawAIOCB **pacb;
 628
 629     /* remove the callback from the queue */
 630     pacb = &posix_aio_state->first_aio;
 631     for(;;) {
 632         if (*pacb == NULL) {
 633             fprintf(stderr, "raw_aio_remove: aio request not found!\n");
 634             break;
 635         } else if (*pacb == acb) {
 636             *pacb = acb->next;
 637             qemu_aio_release(acb);
 638             break;
 639         }
 640         pacb = &(*pacb)->next;
 641     }
 642 }
 643
 644 static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
 645         int64_t sector_num, uint8_t *buf, int nb_sectors,
 646         BlockDriverCompletionFunc *cb, void *opaque)
 647 {
 648     RawAIOCB *acb;
 649
 650     /*
 651      * If O_DIRECT is used and the buffer is not aligned fall back
 652      * to synchronous IO.
 653      */
 654     BDRVRawState *s = bs->opaque;
 655
 656     if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
 657         QEMUBH *bh;
 658         acb = qemu_aio_get(bs, cb, opaque);
 659         acb->ret = raw_pread(bs, 512 * sector_num, buf, 512 * nb_sectors);
 660         bh = qemu_bh_new(raw_aio_em_cb, acb);
 661         qemu_bh_schedule(bh);
 662         return &acb->common;
 663     }
 664
 665     acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
 666     if (!acb)
 667         return NULL;
 668     if (qemu_paio_read(&acb->aiocb) < 0) {
 669         raw_aio_remove(acb);
 670         return NULL;
 671     }
 672     return &acb->common;
 673 }
 674
 675 static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs,
 676         int64_t sector_num, const uint8_t *buf, int nb_sectors,
 677         BlockDriverCompletionFunc *cb, void *opaque)
 678 {
 679     RawAIOCB *acb;
 680
 681     /*
 682      * If O_DIRECT is used and the buffer is not aligned fall back
 683      * to synchronous IO.
 684      */
 685     BDRVRawState *s = bs->opaque;
 686
 687     if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
 688         QEMUBH *bh;
 689         acb = qemu_aio_get(bs, cb, opaque);
 690         acb->ret = raw_pwrite(bs, 512 * sector_num, buf, 512 * nb_sectors);
 691         bh = qemu_bh_new(raw_aio_em_cb, acb);
 692         qemu_bh_schedule(bh);
 693         return &acb->common;
 694     }
 695
 696     acb = raw_aio_setup(bs, sector_num, (uint8_t*)buf, nb_sectors, cb, opaque);
 697     if (!acb)
 698         return NULL;
 699     if (qemu_paio_write(&acb->aiocb) < 0) {
 700         raw_aio_remove(acb);
 701         return NULL;
 702     }
 703     return &acb->common;
 704 }
 705
 706 static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
 707 {
 708     int ret;
 709     RawAIOCB *acb = (RawAIOCB *)blockacb;
 710
 711     ret = qemu_paio_cancel(acb->aiocb.aio_fildes, &acb->aiocb);
 712     if (ret == QEMU_PAIO_NOTCANCELED) {
 713         /* fail safe: if the aio could not be canceled, we wait for
 714            it */
 715         while (qemu_paio_error(&acb->aiocb) == EINPROGRESS);
 716     }
 717
 718     raw_aio_remove(acb);
 719 }
 720 #else /* CONFIG_AIO */
 721 static int posix_aio_init(void)
 722 {
 723     return 0;
 724 }
 725 #endif /* CONFIG_AIO */
 726
 727
 728 static void raw_close(BlockDriverState *bs)
 729 {
 730     BDRVRawState *s = bs->opaque;
 731     if (s->fd >= 0) {
 732         close(s->fd);
 733         s->fd = -1;
 734         if (s->aligned_buf != NULL)
 735             qemu_free(s->aligned_buf);
 736     }
 737 }
 738
 739 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 740 {
 741     BDRVRawState *s = bs->opaque;
 742     if (s->type != FTYPE_FILE)
 743         return -ENOTSUP;
 744     if (ftruncate(s->fd, offset) < 0)
 745         return -errno;
 746     return 0;
 747 }
 748
 749 #ifdef __OpenBSD__
 750 static int64_t raw_getlength(BlockDriverState *bs)
 751 {
 752     BDRVRawState *s = bs->opaque;
 753     int fd = s->fd;
 754     struct stat st;
 755
 756     if (fstat(fd, &st))
 757         return -1;
 758     if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
 759         struct disklabel dl;
 760
 761         if (ioctl(fd, DIOCGDINFO, &dl))
 762             return -1;
 763         return (uint64_t)dl.d_secsize *
 764             dl.d_partitions[DISKPART(st.st_rdev)].p_size;
 765     } else
 766         return st.st_size;
 767 }
 768 #else /* !__OpenBSD__ */
 769 static int64_t  raw_getlength(BlockDriverState *bs)
 770 {
 771     BDRVRawState *s = bs->opaque;
 772     int fd = s->fd;
 773     int64_t size;
 774 #ifdef HOST_BSD
 775     struct stat sb;
 776 #endif
 777 #ifdef __sun__
 778     struct dk_minfo minfo;
 779     int rv;
 780 #endif
 781     int ret;
 782
 783     ret = fd_open(bs);
 784     if (ret < 0)
 785         return ret;
 786
 787 #ifdef HOST_BSD
 788     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
 789 #ifdef DIOCGMEDIASIZE
 790         if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
 791 #elif defined(DIOCGPART)
 792         {
 793                 struct partinfo pi;
 794                 if (ioctl(fd, DIOCGPART, &pi) == 0)
 795                         size = pi.media_size;
 796                 else
 797                         size = 0;
 798         }
 799         if (size == 0)
 800 #endif
 801 #ifdef CONFIG_COCOA
 802         size = LONG_LONG_MAX;
 803 #else
 804         size = lseek(fd, 0LL, SEEK_END);
 805 #endif
 806     } else
 807 #endif
 808 #ifdef __sun__
 809     /*
 810      * use the DKIOCGMEDIAINFO ioctl to read the size.
 811      */
 812     rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
 813     if ( rv != -1 ) {
 814         size = minfo.dki_lbsize * minfo.dki_capacity;
 815     } else /* there are reports that lseek on some devices
 816               fails, but irc discussion said that contingency
 817               on contingency was overkill */
 818 #endif
 819     {
 820         size = lseek(fd, 0, SEEK_END);
 821     }
 822     return size;
 823 }
 824 #endif
 825
 826 static int raw_create(const char *filename, int64_t total_size,
 827                       const char *backing_file, int flags)
 828 {
 829     int fd;
 830
 831     if (flags || backing_file)
 832         return -ENOTSUP;
 833
 834     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 835               0644);
 836     if (fd < 0)
 837         return -EIO;
 838     ftruncate(fd, total_size * 512);
 839     close(fd);
 840     return 0;
 841 }
 842
 843 static void raw_flush(BlockDriverState *bs)
 844 {
 845     BDRVRawState *s = bs->opaque;
 846     fsync(s->fd);
 847 }
 848
 849 BlockDriver bdrv_raw = {
 850     "raw",
 851     sizeof(BDRVRawState),
 852     NULL, /* no probe for protocols */
 853     raw_open,
 854     NULL,
 855     NULL,
 856     raw_close,
 857     raw_create,
 858     raw_flush,
 859
 860 #ifdef CONFIG_AIO
 861     .bdrv_aio_read = raw_aio_read,
 862     .bdrv_aio_write = raw_aio_write,
 863     .bdrv_aio_cancel = raw_aio_cancel,
 864     .aiocb_size = sizeof(RawAIOCB),
 865 #endif
 866
 867     .bdrv_read = raw_read,
 868     .bdrv_write = raw_write,
 869     .bdrv_truncate = raw_truncate,
 870     .bdrv_getlength = raw_getlength,
 871 };
 872
 873 /***********************************************/
 874 /* host device */
 875
 876 #ifdef CONFIG_COCOA
 877 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
 878 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
 879
 880 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
 881 {
 882     kern_return_t       kernResult;
 883     mach_port_t     masterPort;
 884     CFMutableDictionaryRef  classesToMatch;
 885
 886     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
 887     if ( KERN_SUCCESS != kernResult ) {
 888         printf( "IOMasterPort returned %d\n", kernResult );
 889     }
 890
 891     classesToMatch = IOServiceMatching( kIOCDMediaClass );
 892     if ( classesToMatch == NULL ) {
 893         printf( "IOServiceMatching returned a NULL dictionary.\n" );
 894     } else {
 895     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
 896     }
 897     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
 898     if ( KERN_SUCCESS != kernResult )
 899     {
 900         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
 901     }
 902
 903     return kernResult;
 904 }
 905
 906 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
 907 {
 908     io_object_t     nextMedia;
 909     kern_return_t   kernResult = KERN_FAILURE;
 910     *bsdPath = '\0';
 911     nextMedia = IOIteratorNext( mediaIterator );
 912     if ( nextMedia )
 913     {
 914         CFTypeRef   bsdPathAsCFString;
 915     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
 916         if ( bsdPathAsCFString ) {
 917             size_t devPathLength;
 918             strcpy( bsdPath, _PATH_DEV );
 919             strcat( bsdPath, "r" );
 920             devPathLength = strlen( bsdPath );
 921             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
 922                 kernResult = KERN_SUCCESS;
 923             }
 924             CFRelease( bsdPathAsCFString );
 925         }
 926         IOObjectRelease( nextMedia );
 927     }
 928
 929     return kernResult;
 930 }
 931
 932 #endif
 933
 934 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 935 {
 936     BDRVRawState *s = bs->opaque;
 937     int fd, open_flags, ret;
 938
 939     posix_aio_init();
 940
 941 #ifdef CONFIG_COCOA
 942     if (strstart(filename, "/dev/cdrom", NULL)) {
 943         kern_return_t kernResult;
 944         io_iterator_t mediaIterator;
 945         char bsdPath[ MAXPATHLEN ];
 946         int fd;
 947
 948         kernResult = FindEjectableCDMedia( &mediaIterator );
 949         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
 950
 951         if ( bsdPath[ 0 ] != '\0' ) {
 952             strcat(bsdPath,"s0");
 953             /* some CDs don't have a partition 0 */
 954             fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
 955             if (fd < 0) {
 956                 bsdPath[strlen(bsdPath)-1] = '1';
 957             } else {
 958                 close(fd);
 959             }
 960             filename = bsdPath;
 961         }
 962
 963         if ( mediaIterator )
 964             IOObjectRelease( mediaIterator );
 965     }
 966 #endif
 967     open_flags = O_BINARY;
 968     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 969         open_flags |= O_RDWR;
 970     } else {
 971         open_flags |= O_RDONLY;
 972         bs->read_only = 1;
 973     }
 974     /* Use O_DSYNC for write-through caching, no flags for write-back caching,
 975      * and O_DIRECT for no caching. */
 976     if ((flags & BDRV_O_NOCACHE))
 977         open_flags |= O_DIRECT;
 978     else if (!(flags & BDRV_O_CACHE_WB))
 979         open_flags |= O_DSYNC;
 980
 981     s->type = FTYPE_FILE;
 982 #if defined(__linux__)
 983     if (strstart(filename, "/dev/cd", NULL)) {
 984         /* open will not fail even if no CD is inserted */
 985         open_flags |= O_NONBLOCK;
 986         s->type = FTYPE_CD;
 987     } else if (strstart(filename, "/dev/fd", NULL)) {
 988         s->type = FTYPE_FD;
 989         s->fd_open_flags = open_flags;
 990         /* open will not fail even if no floppy is inserted */
 991         open_flags |= O_NONBLOCK;
 992     } else if (strstart(filename, "/dev/sg", NULL)) {
 993         bs->sg = 1;
 994     }
 995 #endif
 996     fd = open(filename, open_flags, 0644);
 997     if (fd < 0) {
 998         ret = -errno;
 999         if (ret == -EROFS)
1000             ret = -EACCES;
1001         return ret;
1002     }
1003     s->fd = fd;
1004 #if defined(__linux__)
1005     /* close fd so that we can reopen it as needed */
1006     if (s->type == FTYPE_FD) {
1007         close(s->fd);
1008         s->fd = -1;
1009         s->fd_media_changed = 1;
1010     }
1011 #endif
1012     return 0;
1013 }
1014
1015 #if defined(__linux__)
1016 /* Note: we do not have a reliable method to detect if the floppy is
1017    present. The current method is to try to open the floppy at every
1018    I/O and to keep it opened during a few hundreds of ms. */
1019 static int fd_open(BlockDriverState *bs)
1020 {
1021     BDRVRawState *s = bs->opaque;
1022     int last_media_present;
1023
1024     if (s->type != FTYPE_FD)
1025         return 0;
1026     last_media_present = (s->fd >= 0);
1027     if (s->fd >= 0 &&
1028         (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
1029         close(s->fd);
1030         s->fd = -1;
1031 #ifdef DEBUG_FLOPPY
1032         printf("Floppy closed\n");
1033 #endif
1034     }
1035     if (s->fd < 0) {
1036         if (s->fd_got_error &&
1037             (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
1038 #ifdef DEBUG_FLOPPY
1039             printf("No floppy (open delayed)\n");
1040 #endif
1041             return -EIO;
1042         }
1043         s->fd = open(bs->filename, s->fd_open_flags);
1044         if (s->fd < 0) {
1045             s->fd_error_time = qemu_get_clock(rt_clock);
1046             s->fd_got_error = 1;
1047             if (last_media_present)
1048                 s->fd_media_changed = 1;
1049 #ifdef DEBUG_FLOPPY
1050             printf("No floppy\n");
1051 #endif
1052             return -EIO;
1053         }
1054 #ifdef DEBUG_FLOPPY
1055         printf("Floppy opened\n");
1056 #endif
1057     }
1058     if (!last_media_present)
1059         s->fd_media_changed = 1;
1060     s->fd_open_time = qemu_get_clock(rt_clock);
1061     s->fd_got_error = 0;
1062     return 0;
1063 }
1064
1065 static int raw_is_inserted(BlockDriverState *bs)
1066 {
1067     BDRVRawState *s = bs->opaque;
1068     int ret;
1069
1070     switch(s->type) {
1071     case FTYPE_CD:
1072         ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1073         if (ret == CDS_DISC_OK)
1074             return 1;
1075         else
1076             return 0;
1077         break;
1078     case FTYPE_FD:
1079         ret = fd_open(bs);
1080         return (ret >= 0);
1081     default:
1082         return 1;
1083     }
1084 }
1085
1086 /* currently only used by fdc.c, but a CD version would be good too */
1087 static int raw_media_changed(BlockDriverState *bs)
1088 {
1089     BDRVRawState *s = bs->opaque;
1090
1091     switch(s->type) {
1092     case FTYPE_FD:
1093         {
1094             int ret;
1095             /* XXX: we do not have a true media changed indication. It
1096                does not work if the floppy is changed without trying
1097                to read it */
1098             fd_open(bs);
1099             ret = s->fd_media_changed;
1100             s->fd_media_changed = 0;
1101 #ifdef DEBUG_FLOPPY
1102             printf("Floppy changed=%d\n", ret);
1103 #endif
1104             return ret;
1105         }
1106     default:
1107         return -ENOTSUP;
1108     }
1109 }
1110
1111 static int raw_eject(BlockDriverState *bs, int eject_flag)
1112 {
1113     BDRVRawState *s = bs->opaque;
1114
1115     switch(s->type) {
1116     case FTYPE_CD:
1117         if (eject_flag) {
1118             if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
1119                 perror("CDROMEJECT");
1120         } else {
1121             if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
1122                 perror("CDROMEJECT");
1123         }
1124         break;
1125     case FTYPE_FD:
1126         {
1127             int fd;
1128             if (s->fd >= 0) {
1129                 close(s->fd);
1130                 s->fd = -1;
1131             }
1132             fd = open(bs->filename, s->fd_open_flags | O_NONBLOCK);
1133             if (fd >= 0) {
1134                 if (ioctl(fd, FDEJECT, 0) < 0)
1135                     perror("FDEJECT");
1136                 close(fd);
1137             }
1138         }
1139         break;
1140     default:
1141         return -ENOTSUP;
1142     }
1143     return 0;
1144 }
1145
1146 static int raw_set_locked(BlockDriverState *bs, int locked)
1147 {
1148     BDRVRawState *s = bs->opaque;
1149
1150     switch(s->type) {
1151     case FTYPE_CD:
1152         if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
1153             /* Note: an error can happen if the distribution automatically
1154                mounts the CD-ROM */
1155             //        perror("CDROM_LOCKDOOR");
1156         }
1157         break;
1158     default:
1159         return -ENOTSUP;
1160     }
1161     return 0;
1162 }
1163
1164 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1165 {
1166     BDRVRawState *s = bs->opaque;
1167
1168     return ioctl(s->fd, req, buf);
1169 }
1170 #else
1171
1172 static int fd_open(BlockDriverState *bs)
1173 {
1174     return 0;
1175 }
1176
1177 static int raw_is_inserted(BlockDriverState *bs)
1178 {
1179     return 1;
1180 }
1181
1182 static int raw_media_changed(BlockDriverState *bs)
1183 {
1184     return -ENOTSUP;
1185 }
1186
1187 static int raw_eject(BlockDriverState *bs, int eject_flag)
1188 {
1189     return -ENOTSUP;
1190 }
1191
1192 static int raw_set_locked(BlockDriverState *bs, int locked)
1193 {
1194     return -ENOTSUP;
1195 }
1196
1197 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1198 {
1199     return -ENOTSUP;
1200 }
1201 #endif /* !linux */
1202
1203 static int raw_sg_send_command(BlockDriverState *bs, void *buf, int count)
1204 {
1205     return raw_pwrite(bs, -1, buf, count);
1206 }
1207
1208 static int raw_sg_recv_response(BlockDriverState *bs, void *buf, int count)
1209 {
1210     return raw_pread(bs, -1, buf, count);
1211 }
1212
1213 static BlockDriverAIOCB *raw_sg_aio_read(BlockDriverState *bs,
1214                                          void *buf, int count,
1215                                          BlockDriverCompletionFunc *cb,
1216                                          void *opaque)
1217 {
1218     return raw_aio_read(bs, 0, buf, -(int64_t)count, cb, opaque);
1219 }
1220
1221 static BlockDriverAIOCB *raw_sg_aio_write(BlockDriverState *bs,
1222                                           void *buf, int count,
1223                                           BlockDriverCompletionFunc *cb,
1224                                           void *opaque)
1225 {
1226     return raw_aio_write(bs, 0, buf, -(int64_t)count, cb, opaque);
1227 }
1228
1229 BlockDriver bdrv_host_device = {
1230     .format_name        = "host_device",
1231     .instance_size      = sizeof(BDRVRawState),
1232     .bdrv_open          = hdev_open,
1233     .bdrv_close         = raw_close,
1234     .bdrv_flush         = raw_flush,
1235
1236 #ifdef CONFIG_AIO
1237     .bdrv_aio_read      = raw_aio_read,
1238     .bdrv_aio_write     = raw_aio_write,
1239     .bdrv_aio_cancel    = raw_aio_cancel,
1240     .aiocb_size         = sizeof(RawAIOCB),
1241 #endif
1242
1243     .bdrv_read          = raw_read,
1244     .bdrv_write         = raw_write,
1245     .bdrv_getlength     = raw_getlength,
1246
1247     /* removable device support */
1248     .bdrv_is_inserted   = raw_is_inserted,
1249     .bdrv_media_changed = raw_media_changed,
1250     .bdrv_eject         = raw_eject,
1251     .bdrv_set_locked    = raw_set_locked,
1252     /* generic scsi device */
1253     .bdrv_ioctl         = raw_ioctl,
1254     .bdrv_sg_send_command  = raw_sg_send_command,
1255     .bdrv_sg_recv_response = raw_sg_recv_response,
1256     .bdrv_sg_aio_read      = raw_sg_aio_read,
1257     .bdrv_sg_aio_write     = raw_sg_aio_write,
1258 };