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