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 #if !defined(QEMU_IMG) && !defined(QEMU_NBD)
  26 #include "qemu-timer.h"
  27 #include "exec-all.h"
  28 #endif
  29 #include "block_int.h"
  30 #include <assert.h>
  31 #include <aio.h>
  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 <sys/disk.h>
  57 #endif
  58
  59 //#define DEBUG_FLOPPY
  60
  61 //#define DEBUG_BLOCK
  62 #if defined(DEBUG_BLOCK) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
  63 #define DEBUG_BLOCK_PRINT(formatCstr, args...) do { if (loglevel != 0)  \
  64     { fprintf(logfile, formatCstr, ##args); fflush(logfile); } } while (0)
  65 #else
  66 #define DEBUG_BLOCK_PRINT(formatCstr, args...)
  67 #endif
  68
  69 #define FTYPE_FILE   0
  70 #define FTYPE_CD     1
  71 #define FTYPE_FD     2
  72
  73 #define ALIGNED_BUFFER_SIZE (32 * 512)
  74
  75 /* if the FD is not accessed during that time (in ms), we try to
  76    reopen it to see if the disk has been changed */
  77 #define FD_OPEN_TIMEOUT 1000
  78
  79 typedef struct BDRVRawState {
  80     int fd;
  81     int type;
  82     unsigned int lseek_err_cnt;
  83 #if defined(__linux__)
  84     /* linux floppy specific */
  85     int fd_open_flags;
  86     int64_t fd_open_time;
  87     int64_t fd_error_time;
  88     int fd_got_error;
  89     int fd_media_changed;
  90 #endif
  91 #if defined(O_DIRECT) && !defined(QEMU_IMG)
  92     uint8_t* aligned_buf;
  93 #endif
  94 } BDRVRawState;
  95
  96 static int fd_open(BlockDriverState *bs);
  97
  98 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
  99 {
 100     BDRVRawState *s = bs->opaque;
 101     int fd, open_flags, ret;
 102
 103     s->lseek_err_cnt = 0;
 104
 105     open_flags = O_BINARY;
 106     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 107         open_flags |= O_RDWR;
 108     } else {
 109         open_flags |= O_RDONLY;
 110         bs->read_only = 1;
 111     }
 112     if (flags & BDRV_O_CREAT)
 113         open_flags |= O_CREAT | O_TRUNC;
 114 #ifdef O_DIRECT
 115     if (flags & BDRV_O_DIRECT)
 116         open_flags |= O_DIRECT;
 117 #endif
 118
 119     s->type = FTYPE_FILE;
 120
 121     fd = open(filename, open_flags, 0644);
 122     if (fd < 0) {
 123         ret = -errno;
 124         if (ret == -EROFS)
 125             ret = -EACCES;
 126         return ret;
 127     }
 128     s->fd = fd;
 129 #if defined(O_DIRECT) && !defined(QEMU_IMG)
 130     s->aligned_buf = NULL;
 131     if (flags & BDRV_O_DIRECT) {
 132         s->aligned_buf = qemu_memalign(512, ALIGNED_BUFFER_SIZE);
 133         if (s->aligned_buf == NULL) {
 134             ret = -errno;
 135             close(fd);
 136             return ret;
 137         }
 138     }
 139 #endif
 140     return 0;
 141 }
 142
 143 /* XXX: use host sector size if necessary with:
 144 #ifdef DIOCGSECTORSIZE
 145         {
 146             unsigned int sectorsize = 512;
 147             if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
 148                 sectorsize > bufsize)
 149                 bufsize = sectorsize;
 150         }
 151 #endif
 152 #ifdef CONFIG_COCOA
 153         u_int32_t   blockSize = 512;
 154         if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
 155             bufsize = blockSize;
 156         }
 157 #endif
 158 */
 159
 160 /*
 161  * offset and count are in bytes, but must be multiples of 512 for files
 162  * opened with O_DIRECT. buf must be aligned to 512 bytes then.
 163  *
 164  * This function may be called without alignment if the caller ensures
 165  * that O_DIRECT is not in effect.
 166  */
 167 static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
 168                      uint8_t *buf, int count)
 169 {
 170     BDRVRawState *s = bs->opaque;
 171     int ret;
 172
 173     ret = fd_open(bs);
 174     if (ret < 0)
 175         return ret;
 176
 177     if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
 178         ++(s->lseek_err_cnt);
 179         if(s->lseek_err_cnt <= 10) {
 180             DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 181                               "] lseek failed : %d = %s\n",
 182                               s->fd, bs->filename, offset, buf, count,
 183                               bs->total_sectors, errno, strerror(errno));
 184         }
 185         return -1;
 186     }
 187     s->lseek_err_cnt=0;
 188
 189     ret = read(s->fd, buf, count);
 190     if (ret == count)
 191         goto label__raw_read__success;
 192
 193     DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 194                       "] read failed %d : %d = %s\n",
 195                       s->fd, bs->filename, offset, buf, count,
 196                       bs->total_sectors, ret, errno, strerror(errno));
 197
 198     /* Try harder for CDrom. */
 199     if (bs->type == BDRV_TYPE_CDROM) {
 200         lseek(s->fd, offset, SEEK_SET);
 201         ret = read(s->fd, buf, count);
 202         if (ret == count)
 203             goto label__raw_read__success;
 204         lseek(s->fd, offset, SEEK_SET);
 205         ret = read(s->fd, buf, count);
 206         if (ret == count)
 207             goto label__raw_read__success;
 208
 209         DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 210                           "] retry read failed %d : %d = %s\n",
 211                           s->fd, bs->filename, offset, buf, count,
 212                           bs->total_sectors, ret, errno, strerror(errno));
 213     }
 214
 215 label__raw_read__success:
 216
 217     return ret;
 218 }
 219
 220 /*
 221  * offset and count are in bytes, but must be multiples of 512 for files
 222  * opened with O_DIRECT. buf must be aligned to 512 bytes then.
 223  *
 224  * This function may be called without alignment if the caller ensures
 225  * that O_DIRECT is not in effect.
 226  */
 227 static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
 228                       const uint8_t *buf, int count)
 229 {
 230     BDRVRawState *s = bs->opaque;
 231     int ret;
 232
 233     ret = fd_open(bs);
 234     if (ret < 0)
 235         return ret;
 236
 237     if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
 238         ++(s->lseek_err_cnt);
 239         if(s->lseek_err_cnt) {
 240             DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%"
 241                               PRId64 "] lseek failed : %d = %s\n",
 242                               s->fd, bs->filename, offset, buf, count,
 243                               bs->total_sectors, errno, strerror(errno));
 244         }
 245         return -1;
 246     }
 247     s->lseek_err_cnt = 0;
 248
 249     ret = write(s->fd, buf, count);
 250     if (ret == count)
 251         goto label__raw_write__success;
 252
 253     DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 254                       "] write failed %d : %d = %s\n",
 255                       s->fd, bs->filename, offset, buf, count,
 256                       bs->total_sectors, ret, errno, strerror(errno));
 257
 258 label__raw_write__success:
 259
 260     return ret;
 261 }
 262
 263
 264 #if defined(O_DIRECT) && !defined(QEMU_IMG)
 265 /*
 266  * offset and count are in bytes and possibly not aligned. For files opened
 267  * with O_DIRECT, necessary alignments are ensured before calling
 268  * raw_pread_aligned to do the actual read.
 269  */
 270 static int raw_pread(BlockDriverState *bs, int64_t offset,
 271                      uint8_t *buf, int count)
 272 {
 273     BDRVRawState *s = bs->opaque;
 274     int size, ret, shift, sum;
 275
 276     sum = 0;
 277
 278     if (s->aligned_buf != NULL)  {
 279
 280         if (offset & 0x1ff) {
 281             /* align offset on a 512 bytes boundary */
 282
 283             shift = offset & 0x1ff;
 284             size = (shift + count + 0x1ff) & ~0x1ff;
 285             if (size > ALIGNED_BUFFER_SIZE)
 286                 size = ALIGNED_BUFFER_SIZE;
 287             ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size);
 288             if (ret < 0)
 289                 return ret;
 290
 291             size = 512 - shift;
 292             if (size > count)
 293                 size = count;
 294             memcpy(buf, s->aligned_buf + shift, size);
 295
 296             buf += size;
 297             offset += size;
 298             count -= size;
 299             sum += size;
 300
 301             if (count == 0)
 302                 return sum;
 303         }
 304         if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
 305
 306             /* read on aligned buffer */
 307
 308             while (count) {
 309
 310                 size = (count + 0x1ff) & ~0x1ff;
 311                 if (size > ALIGNED_BUFFER_SIZE)
 312                     size = ALIGNED_BUFFER_SIZE;
 313
 314                 ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
 315                 if (ret < 0)
 316                     return ret;
 317
 318                 size = ret;
 319                 if (size > count)
 320                     size = count;
 321
 322                 memcpy(buf, s->aligned_buf, size);
 323
 324                 buf += size;
 325                 offset += size;
 326                 count -= size;
 327                 sum += size;
 328             }
 329
 330             return sum;
 331         }
 332     }
 333
 334     return raw_pread_aligned(bs, offset, buf, count) + sum;
 335 }
 336
 337 /*
 338  * offset and count are in bytes and possibly not aligned. For files opened
 339  * with O_DIRECT, necessary alignments are ensured before calling
 340  * raw_pwrite_aligned to do the actual write.
 341  */
 342 static int raw_pwrite(BlockDriverState *bs, int64_t offset,
 343                       const uint8_t *buf, int count)
 344 {
 345     BDRVRawState *s = bs->opaque;
 346     int size, ret, shift, sum;
 347
 348     sum = 0;
 349
 350     if (s->aligned_buf != NULL) {
 351
 352         if (offset & 0x1ff) {
 353             /* align offset on a 512 bytes boundary */
 354             shift = offset & 0x1ff;
 355             ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, 512);
 356             if (ret < 0)
 357                 return ret;
 358
 359             size = 512 - shift;
 360             if (size > count)
 361                 size = count;
 362             memcpy(s->aligned_buf + shift, buf, size);
 363
 364             ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf, 512);
 365             if (ret < 0)
 366                 return ret;
 367
 368             buf += size;
 369             offset += size;
 370             count -= size;
 371             sum += size;
 372
 373             if (count == 0)
 374                 return sum;
 375         }
 376         if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
 377
 378             while ((size = (count & ~0x1ff)) != 0) {
 379
 380                 if (size > ALIGNED_BUFFER_SIZE)
 381                     size = ALIGNED_BUFFER_SIZE;
 382
 383                 memcpy(s->aligned_buf, buf, size);
 384
 385                 ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size);
 386                 if (ret < 0)
 387                     return ret;
 388
 389                 buf += ret;
 390                 offset += ret;
 391                 count -= ret;
 392                 sum += ret;
 393             }
 394             /* here, count < 512 because (count & ~0x1ff) == 0 */
 395             if (count) {
 396                 ret = raw_pread_aligned(bs, offset, s->aligned_buf, 512);
 397                 if (ret < 0)
 398                     return ret;
 399                  memcpy(s->aligned_buf, buf, count);
 400
 401                  ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, 512);
 402                  if (ret < 0)
 403                      return ret;
 404                  if (count < ret)
 405                      ret = count;
 406
 407                  sum += ret;
 408             }
 409             return sum;
 410         }
 411     }
 412     return raw_pwrite_aligned(bs, offset, buf, count) + sum;
 413 }
 414
 415 #else
 416 #define raw_pread raw_pread_aligned
 417 #define raw_pwrite raw_pwrite_aligned
 418 #endif
 419
 420
 421 /***********************************************************/
 422 /* Unix AIO using POSIX AIO */
 423
 424 typedef struct RawAIOCB {
 425     BlockDriverAIOCB common;
 426     struct aiocb aiocb;
 427     struct RawAIOCB *next;
 428     int ret;
 429 } RawAIOCB;
 430
 431 static int aio_sig_num = SIGUSR2;
 432 static RawAIOCB *first_aio; /* AIO issued */
 433 static int aio_initialized = 0;
 434
 435 static void aio_signal_handler(int signum)
 436 {
 437 #if !defined(QEMU_IMG) && !defined(QEMU_NBD)
 438     CPUState *env = cpu_single_env;
 439     if (env) {
 440         /* stop the currently executing cpu because a timer occured */
 441         cpu_interrupt(env, CPU_INTERRUPT_EXIT);
 442 #ifdef USE_KQEMU
 443         if (env->kqemu_enabled) {
 444             kqemu_cpu_interrupt(env);
 445         }
 446 #endif
 447     }
 448 #endif
 449 }
 450
 451 void qemu_aio_init(void)
 452 {
 453     struct sigaction act;
 454
 455     aio_initialized = 1;
 456
 457     sigfillset(&act.sa_mask);
 458     act.sa_flags = 0; /* do not restart syscalls to interrupt select() */
 459     act.sa_handler = aio_signal_handler;
 460     sigaction(aio_sig_num, &act, NULL);
 461
 462 #if defined(__GLIBC__) && defined(__linux__)
 463     {
 464         /* XXX: aio thread exit seems to hang on RedHat 9 and this init
 465            seems to fix the problem. */
 466         struct aioinit ai;
 467         memset(&ai, 0, sizeof(ai));
 468         ai.aio_threads = 1;
 469         ai.aio_num = 1;
 470         ai.aio_idle_time = 365 * 100000;
 471         aio_init(&ai);
 472     }
 473 #endif
 474 }
 475
 476 void qemu_aio_poll(void)
 477 {
 478     RawAIOCB *acb, **pacb;
 479     int ret;
 480
 481     for(;;) {
 482         pacb = &first_aio;
 483         for(;;) {
 484             acb = *pacb;
 485             if (!acb)
 486                 goto the_end;
 487             ret = aio_error(&acb->aiocb);
 488             if (ret == ECANCELED) {
 489                 /* remove the request */
 490                 *pacb = acb->next;
 491                 qemu_aio_release(acb);
 492             } else if (ret != EINPROGRESS) {
 493                 /* end of aio */
 494                 if (ret == 0) {
 495                     ret = aio_return(&acb->aiocb);
 496                     if (ret == acb->aiocb.aio_nbytes)
 497                         ret = 0;
 498                     else
 499                         ret = -EINVAL;
 500                 } else {
 501                     ret = -ret;
 502                 }
 503                 /* remove the request */
 504                 *pacb = acb->next;
 505                 /* call the callback */
 506                 acb->common.cb(acb->common.opaque, ret);
 507                 qemu_aio_release(acb);
 508                 break;
 509             } else {
 510                 pacb = &acb->next;
 511             }
 512         }
 513     }
 514  the_end: ;
 515 }
 516
 517 /* Wait for all IO requests to complete.  */
 518 void qemu_aio_flush(void)
 519 {
 520     qemu_aio_wait_start();
 521     qemu_aio_poll();
 522     while (first_aio) {
 523         qemu_aio_wait();
 524     }
 525     qemu_aio_wait_end();
 526 }
 527
 528 /* wait until at least one AIO was handled */
 529 static sigset_t wait_oset;
 530
 531 void qemu_aio_wait_start(void)
 532 {
 533     sigset_t set;
 534
 535     if (!aio_initialized)
 536         qemu_aio_init();
 537     sigemptyset(&set);
 538     sigaddset(&set, aio_sig_num);
 539     sigprocmask(SIG_BLOCK, &set, &wait_oset);
 540 }
 541
 542 void qemu_aio_wait(void)
 543 {
 544     sigset_t set;
 545     int nb_sigs;
 546
 547 #if !defined(QEMU_IMG) && !defined(QEMU_NBD)
 548     if (qemu_bh_poll())
 549         return;
 550 #endif
 551     sigemptyset(&set);
 552     sigaddset(&set, aio_sig_num);
 553     sigwait(&set, &nb_sigs);
 554     qemu_aio_poll();
 555 }
 556
 557 void qemu_aio_wait_end(void)
 558 {
 559     sigprocmask(SIG_SETMASK, &wait_oset, NULL);
 560 }
 561
 562 static RawAIOCB *raw_aio_setup(BlockDriverState *bs,
 563         int64_t sector_num, uint8_t *buf, int nb_sectors,
 564         BlockDriverCompletionFunc *cb, void *opaque)
 565 {
 566     BDRVRawState *s = bs->opaque;
 567     RawAIOCB *acb;
 568
 569     if (fd_open(bs) < 0)
 570         return NULL;
 571
 572     acb = qemu_aio_get(bs, cb, opaque);
 573     if (!acb)
 574         return NULL;
 575     acb->aiocb.aio_fildes = s->fd;
 576     acb->aiocb.aio_sigevent.sigev_signo = aio_sig_num;
 577     acb->aiocb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
 578     acb->aiocb.aio_buf = buf;
 579     if (nb_sectors < 0)
 580         acb->aiocb.aio_nbytes = -nb_sectors;
 581     else
 582         acb->aiocb.aio_nbytes = nb_sectors * 512;
 583     acb->aiocb.aio_offset = sector_num * 512;
 584     acb->next = first_aio;
 585     first_aio = acb;
 586     return acb;
 587 }
 588
 589 #if !defined(QEMU_IMG) && !defined(QEMU_NBD)
 590 static void raw_aio_em_cb(void* opaque)
 591 {
 592     RawAIOCB *acb = opaque;
 593     acb->common.cb(acb->common.opaque, acb->ret);
 594     qemu_aio_release(acb);
 595 }
 596 #endif
 597
 598 static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
 599         int64_t sector_num, uint8_t *buf, int nb_sectors,
 600         BlockDriverCompletionFunc *cb, void *opaque)
 601 {
 602     RawAIOCB *acb;
 603
 604     /*
 605      * If O_DIRECT is used and the buffer is not aligned fall back
 606      * to synchronous IO.
 607      */
 608 #if defined(O_DIRECT) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
 609     BDRVRawState *s = bs->opaque;
 610
 611     if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
 612         QEMUBH *bh;
 613         acb = qemu_aio_get(bs, cb, opaque);
 614         acb->ret = raw_pread(bs, 512 * sector_num, buf, 512 * nb_sectors);
 615         bh = qemu_bh_new(raw_aio_em_cb, acb);
 616         qemu_bh_schedule(bh);
 617         return &acb->common;
 618     }
 619 #endif
 620
 621     acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
 622     if (!acb)
 623         return NULL;
 624     if (aio_read(&acb->aiocb) < 0) {
 625         qemu_aio_release(acb);
 626         return NULL;
 627     }
 628     return &acb->common;
 629 }
 630
 631 static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs,
 632         int64_t sector_num, const uint8_t *buf, int nb_sectors,
 633         BlockDriverCompletionFunc *cb, void *opaque)
 634 {
 635     RawAIOCB *acb;
 636
 637     /*
 638      * If O_DIRECT is used and the buffer is not aligned fall back
 639      * to synchronous IO.
 640      */
 641 #if defined(O_DIRECT) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
 642     BDRVRawState *s = bs->opaque;
 643
 644     if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
 645         QEMUBH *bh;
 646         acb = qemu_aio_get(bs, cb, opaque);
 647         acb->ret = raw_pwrite(bs, 512 * sector_num, buf, 512 * nb_sectors);
 648         bh = qemu_bh_new(raw_aio_em_cb, acb);
 649         qemu_bh_schedule(bh);
 650         return &acb->common;
 651     }
 652 #endif
 653
 654     acb = raw_aio_setup(bs, sector_num, (uint8_t*)buf, nb_sectors, cb, opaque);
 655     if (!acb)
 656         return NULL;
 657     if (aio_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 = aio_cancel(acb->aiocb.aio_fildes, &acb->aiocb);
 671     if (ret == AIO_NOTCANCELED) {
 672         /* fail safe: if the aio could not be canceled, we wait for
 673            it */
 674         while (aio_error(&acb->aiocb) == EINPROGRESS);
 675     }
 676
 677     /* remove the callback from the queue */
 678     pacb = &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
 691 static void raw_close(BlockDriverState *bs)
 692 {
 693     BDRVRawState *s = bs->opaque;
 694     if (s->fd >= 0) {
 695         close(s->fd);
 696         s->fd = -1;
 697 #if defined(O_DIRECT) && !defined(QEMU_IMG)
 698         if (s->aligned_buf != NULL)
 699             qemu_free(s->aligned_buf);
 700 #endif
 701     }
 702 }
 703
 704 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 705 {
 706     BDRVRawState *s = bs->opaque;
 707     if (s->type != FTYPE_FILE)
 708         return -ENOTSUP;
 709     if (ftruncate(s->fd, offset) < 0)
 710         return -errno;
 711     return 0;
 712 }
 713
 714 static int64_t  raw_getlength(BlockDriverState *bs)
 715 {
 716     BDRVRawState *s = bs->opaque;
 717     int fd = s->fd;
 718     int64_t size;
 719 #ifdef _BSD
 720     struct stat sb;
 721 #endif
 722 #ifdef __sun__
 723     struct dk_minfo minfo;
 724     int rv;
 725 #endif
 726     int ret;
 727
 728     ret = fd_open(bs);
 729     if (ret < 0)
 730         return ret;
 731
 732 #ifdef _BSD
 733     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
 734 #ifdef DIOCGMEDIASIZE
 735         if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
 736 #endif
 737 #ifdef CONFIG_COCOA
 738         size = LONG_LONG_MAX;
 739 #else
 740         size = lseek(fd, 0LL, SEEK_END);
 741 #endif
 742     } else
 743 #endif
 744 #ifdef __sun__
 745     /*
 746      * use the DKIOCGMEDIAINFO ioctl to read the size.
 747      */
 748     rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
 749     if ( rv != -1 ) {
 750         size = minfo.dki_lbsize * minfo.dki_capacity;
 751     } else /* there are reports that lseek on some devices
 752               fails, but irc discussion said that contingency
 753               on contingency was overkill */
 754 #endif
 755     {
 756         size = lseek(fd, 0, SEEK_END);
 757     }
 758     return size;
 759 }
 760
 761 static int raw_create(const char *filename, int64_t total_size,
 762                       const char *backing_file, int flags)
 763 {
 764     int fd;
 765
 766     if (flags || backing_file)
 767         return -ENOTSUP;
 768
 769     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 770               0644);
 771     if (fd < 0)
 772         return -EIO;
 773     ftruncate(fd, total_size * 512);
 774     close(fd);
 775     return 0;
 776 }
 777
 778 static void raw_flush(BlockDriverState *bs)
 779 {
 780     BDRVRawState *s = bs->opaque;
 781     fsync(s->fd);
 782 }
 783
 784 BlockDriver bdrv_raw = {
 785     "raw",
 786     sizeof(BDRVRawState),
 787     NULL, /* no probe for protocols */
 788     raw_open,
 789     NULL,
 790     NULL,
 791     raw_close,
 792     raw_create,
 793     raw_flush,
 794
 795     .bdrv_aio_read = raw_aio_read,
 796     .bdrv_aio_write = raw_aio_write,
 797     .bdrv_aio_cancel = raw_aio_cancel,
 798     .aiocb_size = sizeof(RawAIOCB),
 799     .protocol_name = "file",
 800     .bdrv_pread = raw_pread,
 801     .bdrv_pwrite = raw_pwrite,
 802     .bdrv_truncate = raw_truncate,
 803     .bdrv_getlength = raw_getlength,
 804 };
 805
 806 /***********************************************/
 807 /* host device */
 808
 809 #ifdef CONFIG_COCOA
 810 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
 811 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
 812
 813 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
 814 {
 815     kern_return_t       kernResult;
 816     mach_port_t     masterPort;
 817     CFMutableDictionaryRef  classesToMatch;
 818
 819     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
 820     if ( KERN_SUCCESS != kernResult ) {
 821         printf( "IOMasterPort returned %d\n", kernResult );
 822     }
 823
 824     classesToMatch = IOServiceMatching( kIOCDMediaClass );
 825     if ( classesToMatch == NULL ) {
 826         printf( "IOServiceMatching returned a NULL dictionary.\n" );
 827     } else {
 828     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
 829     }
 830     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
 831     if ( KERN_SUCCESS != kernResult )
 832     {
 833         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
 834     }
 835
 836     return kernResult;
 837 }
 838
 839 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
 840 {
 841     io_object_t     nextMedia;
 842     kern_return_t   kernResult = KERN_FAILURE;
 843     *bsdPath = '\0';
 844     nextMedia = IOIteratorNext( mediaIterator );
 845     if ( nextMedia )
 846     {
 847         CFTypeRef   bsdPathAsCFString;
 848     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
 849         if ( bsdPathAsCFString ) {
 850             size_t devPathLength;
 851             strcpy( bsdPath, _PATH_DEV );
 852             strcat( bsdPath, "r" );
 853             devPathLength = strlen( bsdPath );
 854             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
 855                 kernResult = KERN_SUCCESS;
 856             }
 857             CFRelease( bsdPathAsCFString );
 858         }
 859         IOObjectRelease( nextMedia );
 860     }
 861
 862     return kernResult;
 863 }
 864
 865 #endif
 866
 867 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 868 {
 869     BDRVRawState *s = bs->opaque;
 870     int fd, open_flags, ret;
 871
 872 #ifdef CONFIG_COCOA
 873     if (strstart(filename, "/dev/cdrom", NULL)) {
 874         kern_return_t kernResult;
 875         io_iterator_t mediaIterator;
 876         char bsdPath[ MAXPATHLEN ];
 877         int fd;
 878
 879         kernResult = FindEjectableCDMedia( &mediaIterator );
 880         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
 881
 882         if ( bsdPath[ 0 ] != '\0' ) {
 883             strcat(bsdPath,"s0");
 884             /* some CDs don't have a partition 0 */
 885             fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
 886             if (fd < 0) {
 887                 bsdPath[strlen(bsdPath)-1] = '1';
 888             } else {
 889                 close(fd);
 890             }
 891             filename = bsdPath;
 892         }
 893
 894         if ( mediaIterator )
 895             IOObjectRelease( mediaIterator );
 896     }
 897 #endif
 898     open_flags = O_BINARY;
 899     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 900         open_flags |= O_RDWR;
 901     } else {
 902         open_flags |= O_RDONLY;
 903         bs->read_only = 1;
 904     }
 905 #ifdef O_DIRECT
 906     if (flags & BDRV_O_DIRECT)
 907         open_flags |= O_DIRECT;
 908 #endif
 909
 910     s->type = FTYPE_FILE;
 911 #if defined(__linux__)
 912     if (strstart(filename, "/dev/cd", NULL)) {
 913         /* open will not fail even if no CD is inserted */
 914         open_flags |= O_NONBLOCK;
 915         s->type = FTYPE_CD;
 916     } else if (strstart(filename, "/dev/fd", NULL)) {
 917         s->type = FTYPE_FD;
 918         s->fd_open_flags = open_flags;
 919         /* open will not fail even if no floppy is inserted */
 920         open_flags |= O_NONBLOCK;
 921     } else if (strstart(filename, "/dev/sg", NULL)) {
 922         bs->sg = 1;
 923     }
 924 #endif
 925     fd = open(filename, open_flags, 0644);
 926     if (fd < 0) {
 927         ret = -errno;
 928         if (ret == -EROFS)
 929             ret = -EACCES;
 930         return ret;
 931     }
 932     s->fd = fd;
 933 #if defined(__linux__)
 934     /* close fd so that we can reopen it as needed */
 935     if (s->type == FTYPE_FD) {
 936         close(s->fd);
 937         s->fd = -1;
 938         s->fd_media_changed = 1;
 939     }
 940 #endif
 941     return 0;
 942 }
 943
 944 #if defined(__linux__) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
 945
 946 /* Note: we do not have a reliable method to detect if the floppy is
 947    present. The current method is to try to open the floppy at every
 948    I/O and to keep it opened during a few hundreds of ms. */
 949 static int fd_open(BlockDriverState *bs)
 950 {
 951     BDRVRawState *s = bs->opaque;
 952     int last_media_present;
 953
 954     if (s->type != FTYPE_FD)
 955         return 0;
 956     last_media_present = (s->fd >= 0);
 957     if (s->fd >= 0 &&
 958         (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
 959         close(s->fd);
 960         s->fd = -1;
 961 #ifdef DEBUG_FLOPPY
 962         printf("Floppy closed\n");
 963 #endif
 964     }
 965     if (s->fd < 0) {
 966         if (s->fd_got_error &&
 967             (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
 968 #ifdef DEBUG_FLOPPY
 969             printf("No floppy (open delayed)\n");
 970 #endif
 971             return -EIO;
 972         }
 973         s->fd = open(bs->filename, s->fd_open_flags);
 974         if (s->fd < 0) {
 975             s->fd_error_time = qemu_get_clock(rt_clock);
 976             s->fd_got_error = 1;
 977             if (last_media_present)
 978                 s->fd_media_changed = 1;
 979 #ifdef DEBUG_FLOPPY
 980             printf("No floppy\n");
 981 #endif
 982             return -EIO;
 983         }
 984 #ifdef DEBUG_FLOPPY
 985         printf("Floppy opened\n");
 986 #endif
 987     }
 988     if (!last_media_present)
 989         s->fd_media_changed = 1;
 990     s->fd_open_time = qemu_get_clock(rt_clock);
 991     s->fd_got_error = 0;
 992     return 0;
 993 }
 994 #else
 995 static int fd_open(BlockDriverState *bs)
 996 {
 997     return 0;
 998 }
 999 #endif
1000
1001 #if defined(__linux__)
1002
1003 static int raw_is_inserted(BlockDriverState *bs)
1004 {
1005     BDRVRawState *s = bs->opaque;
1006     int ret;
1007
1008     switch(s->type) {
1009     case FTYPE_CD:
1010         ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1011         if (ret == CDS_DISC_OK)
1012             return 1;
1013         else
1014             return 0;
1015         break;
1016     case FTYPE_FD:
1017         ret = fd_open(bs);
1018         return (ret >= 0);
1019     default:
1020         return 1;
1021     }
1022 }
1023
1024 /* currently only used by fdc.c, but a CD version would be good too */
1025 static int raw_media_changed(BlockDriverState *bs)
1026 {
1027     BDRVRawState *s = bs->opaque;
1028
1029     switch(s->type) {
1030     case FTYPE_FD:
1031         {
1032             int ret;
1033             /* XXX: we do not have a true media changed indication. It
1034                does not work if the floppy is changed without trying
1035                to read it */
1036             fd_open(bs);
1037             ret = s->fd_media_changed;
1038             s->fd_media_changed = 0;
1039 #ifdef DEBUG_FLOPPY
1040             printf("Floppy changed=%d\n", ret);
1041 #endif
1042             return ret;
1043         }
1044     default:
1045         return -ENOTSUP;
1046     }
1047 }
1048
1049 static int raw_eject(BlockDriverState *bs, int eject_flag)
1050 {
1051     BDRVRawState *s = bs->opaque;
1052
1053     switch(s->type) {
1054     case FTYPE_CD:
1055         if (eject_flag) {
1056             if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
1057                 perror("CDROMEJECT");
1058         } else {
1059             if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
1060                 perror("CDROMEJECT");
1061         }
1062         break;
1063     case FTYPE_FD:
1064         {
1065             int fd;
1066             if (s->fd >= 0) {
1067                 close(s->fd);
1068                 s->fd = -1;
1069             }
1070             fd = open(bs->filename, s->fd_open_flags | O_NONBLOCK);
1071             if (fd >= 0) {
1072                 if (ioctl(fd, FDEJECT, 0) < 0)
1073                     perror("FDEJECT");
1074                 close(fd);
1075             }
1076         }
1077         break;
1078     default:
1079         return -ENOTSUP;
1080     }
1081     return 0;
1082 }
1083
1084 static int raw_set_locked(BlockDriverState *bs, int locked)
1085 {
1086     BDRVRawState *s = bs->opaque;
1087
1088     switch(s->type) {
1089     case FTYPE_CD:
1090         if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
1091             /* Note: an error can happen if the distribution automatically
1092                mounts the CD-ROM */
1093             //        perror("CDROM_LOCKDOOR");
1094         }
1095         break;
1096     default:
1097         return -ENOTSUP;
1098     }
1099     return 0;
1100 }
1101
1102 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1103 {
1104     BDRVRawState *s = bs->opaque;
1105
1106     return ioctl(s->fd, req, buf);
1107 }
1108 #else
1109
1110 static int raw_is_inserted(BlockDriverState *bs)
1111 {
1112     return 1;
1113 }
1114
1115 static int raw_media_changed(BlockDriverState *bs)
1116 {
1117     return -ENOTSUP;
1118 }
1119
1120 static int raw_eject(BlockDriverState *bs, int eject_flag)
1121 {
1122     return -ENOTSUP;
1123 }
1124
1125 static int raw_set_locked(BlockDriverState *bs, int locked)
1126 {
1127     return -ENOTSUP;
1128 }
1129
1130 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1131 {
1132     return -ENOTSUP;
1133 }
1134 #endif /* !linux */
1135
1136 BlockDriver bdrv_host_device = {
1137     "host_device",
1138     sizeof(BDRVRawState),
1139     NULL, /* no probe for protocols */
1140     hdev_open,
1141     NULL,
1142     NULL,
1143     raw_close,
1144     NULL,
1145     raw_flush,
1146
1147     .bdrv_aio_read = raw_aio_read,
1148     .bdrv_aio_write = raw_aio_write,
1149     .bdrv_aio_cancel = raw_aio_cancel,
1150     .aiocb_size = sizeof(RawAIOCB),
1151     .bdrv_pread = raw_pread,
1152     .bdrv_pwrite = raw_pwrite,
1153     .bdrv_getlength = raw_getlength,
1154
1155     /* removable device support */
1156     .bdrv_is_inserted = raw_is_inserted,
1157     .bdrv_media_changed = raw_media_changed,
1158     .bdrv_eject = raw_eject,
1159     .bdrv_set_locked = raw_set_locked,
1160     /* generic scsi device */
1161     .bdrv_ioctl = raw_ioctl,
1162 };