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 25 #include "qemu/osdep.h" 26 #include "qapi/error.h" 27 #include "qemu/cutils.h" 28 #include "qemu/error-report.h" 29 #include "block/block-io.h" 30 #include "block/block_int.h" 31 #include "qemu/module.h" 32 #include "qemu/option.h" 33 #include "qemu/units.h" 34 #include "qemu/memalign.h" 35 #include "trace.h" 36 #include "block/thread-pool.h" 37 #include "qemu/iov.h" 38 #include "block/raw-aio.h" 39 #include "qobject/qdict.h" 40 #include "qobject/qstring.h" 41 42 #include "scsi/pr-manager.h" 43 #include "scsi/constants.h" 44 45 #if defined(__APPLE__) && (__MACH__) 46 #include <sys/ioctl.h> 47 #if defined(HAVE_HOST_BLOCK_DEVICE) 48 #include <paths.h> 49 #include <sys/param.h> 50 #include <sys/mount.h> 51 #include <IOKit/IOKitLib.h> 52 #include <IOKit/IOBSD.h> 53 #include <IOKit/storage/IOMediaBSDClient.h> 54 #include <IOKit/storage/IOMedia.h> 55 #include <IOKit/storage/IOCDMedia.h> 56 //#include <IOKit/storage/IOCDTypes.h> 57 #include <IOKit/storage/IODVDMedia.h> 58 #include <CoreFoundation/CoreFoundation.h> 59 #endif /* defined(HAVE_HOST_BLOCK_DEVICE) */ 60 #endif 61 62 #ifdef __sun__ 63 #define _POSIX_PTHREAD_SEMANTICS 1 64 #include <sys/dkio.h> 65 #endif 66 #ifdef __linux__ 67 #include <sys/ioctl.h> 68 #include <sys/param.h> 69 #include <sys/syscall.h> 70 #include <sys/vfs.h> 71 #if defined(CONFIG_BLKZONED) 72 #include <linux/blkzoned.h> 73 #endif 74 #include <linux/cdrom.h> 75 #include <linux/fd.h> 76 #include <linux/fs.h> 77 #include <linux/hdreg.h> 78 #include <linux/magic.h> 79 #include <scsi/sg.h> 80 #ifdef __s390__ 81 #include <asm/dasd.h> 82 #endif 83 #ifndef FS_NOCOW_FL 84 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 85 #endif 86 #endif 87 #if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_FALLOCATE_ZERO_RANGE) 88 #include <linux/falloc.h> 89 #endif 90 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) 91 #include <sys/disk.h> 92 #include <sys/cdio.h> 93 #endif 94 95 #ifdef __OpenBSD__ 96 #include <sys/ioctl.h> 97 #include <sys/disklabel.h> 98 #include <sys/dkio.h> 99 #endif 100 101 #ifdef __NetBSD__ 102 #include <sys/ioctl.h> 103 #include <sys/disklabel.h> 104 #include <sys/dkio.h> 105 #include <sys/disk.h> 106 #endif 107 108 #ifdef __DragonFly__ 109 #include <sys/ioctl.h> 110 #include <sys/diskslice.h> 111 #endif 112 113 #ifdef EMSCRIPTEN 114 #include <sys/ioctl.h> 115 #endif 116 117 /* OS X does not have O_DSYNC */ 118 #ifndef O_DSYNC 119 #ifdef O_SYNC 120 #define O_DSYNC O_SYNC 121 #elif defined(O_FSYNC) 122 #define O_DSYNC O_FSYNC 123 #endif 124 #endif 125 126 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */ 127 #ifndef O_DIRECT 128 #define O_DIRECT O_DSYNC 129 #endif 130 131 #define FTYPE_FILE 0 132 #define FTYPE_CD 1 133 134 #define MAX_BLOCKSIZE 4096 135 136 /* Posix file locking bytes. Libvirt takes byte 0, we start from higher bytes, 137 * leaving a few more bytes for its future use. */ 138 #define RAW_LOCK_PERM_BASE 100 139 #define RAW_LOCK_SHARED_BASE 200 140 141 typedef struct BDRVRawState { 142 int fd; 143 bool use_lock; 144 int type; 145 int open_flags; 146 size_t buf_align; 147 148 /* The current permissions. */ 149 uint64_t perm; 150 uint64_t shared_perm; 151 152 /* The perms bits whose corresponding bytes are already locked in 153 * s->fd. */ 154 uint64_t locked_perm; 155 uint64_t locked_shared_perm; 156 157 uint64_t aio_max_batch; 158 159 int perm_change_fd; 160 int perm_change_flags; 161 BDRVReopenState *reopen_state; 162 163 bool has_discard:1; 164 bool has_write_zeroes:1; 165 bool use_linux_aio:1; 166 bool has_laio_fdsync:1; 167 bool use_linux_io_uring:1; 168 int page_cache_inconsistent; /* errno from fdatasync failure */ 169 bool has_fallocate; 170 bool needs_alignment; 171 bool force_alignment; 172 bool drop_cache; 173 bool check_cache_dropped; 174 struct { 175 uint64_t discard_nb_ok; 176 uint64_t discard_nb_failed; 177 uint64_t discard_bytes_ok; 178 } stats; 179 180 PRManager *pr_mgr; 181 } BDRVRawState; 182 183 typedef struct BDRVRawReopenState { 184 int open_flags; 185 bool drop_cache; 186 bool check_cache_dropped; 187 } BDRVRawReopenState; 188 189 static int fd_open(BlockDriverState *bs) 190 { 191 BDRVRawState *s = bs->opaque; 192 193 /* this is just to ensure s->fd is sane (its called by io ops) */ 194 if (s->fd >= 0) { 195 return 0; 196 } 197 return -EIO; 198 } 199 200 static int64_t raw_getlength(BlockDriverState *bs); 201 static int coroutine_fn raw_co_flush_to_disk(BlockDriverState *bs); 202 203 typedef struct RawPosixAIOData { 204 BlockDriverState *bs; 205 int aio_type; 206 int aio_fildes; 207 208 off_t aio_offset; 209 uint64_t aio_nbytes; 210 211 union { 212 struct { 213 struct iovec *iov; 214 int niov; 215 } io; 216 struct { 217 uint64_t cmd; 218 void *buf; 219 } ioctl; 220 struct { 221 int aio_fd2; 222 off_t aio_offset2; 223 } copy_range; 224 struct { 225 PreallocMode prealloc; 226 Error **errp; 227 } truncate; 228 struct { 229 unsigned int *nr_zones; 230 BlockZoneDescriptor *zones; 231 } zone_report; 232 struct { 233 unsigned long op; 234 } zone_mgmt; 235 }; 236 } RawPosixAIOData; 237 238 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 239 static int cdrom_reopen(BlockDriverState *bs); 240 #endif 241 242 /* 243 * Elide EAGAIN and EACCES details when failing to lock, as this 244 * indicates that the specified file region is already locked by 245 * another process, which is considered a common scenario. 246 */ 247 #define raw_lock_error_setg_errno(errp, err, fmt, ...) \ 248 do { \ 249 if ((err) == EAGAIN || (err) == EACCES) { \ 250 error_setg((errp), (fmt), ## __VA_ARGS__); \ 251 } else { \ 252 error_setg_errno((errp), (err), (fmt), ## __VA_ARGS__); \ 253 } \ 254 } while (0) 255 256 #if defined(__NetBSD__) 257 static int raw_normalize_devicepath(const char **filename, Error **errp) 258 { 259 static char namebuf[PATH_MAX]; 260 const char *dp, *fname; 261 struct stat sb; 262 263 fname = *filename; 264 dp = strrchr(fname, '/'); 265 if (lstat(fname, &sb) < 0) { 266 error_setg_file_open(errp, errno, fname); 267 return -errno; 268 } 269 270 if (!S_ISBLK(sb.st_mode)) { 271 return 0; 272 } 273 274 if (dp == NULL) { 275 snprintf(namebuf, PATH_MAX, "r%s", fname); 276 } else { 277 snprintf(namebuf, PATH_MAX, "%.*s/r%s", 278 (int)(dp - fname), fname, dp + 1); 279 } 280 *filename = namebuf; 281 warn_report("%s is a block device, using %s", fname, *filename); 282 283 return 0; 284 } 285 #else 286 static int raw_normalize_devicepath(const char **filename, Error **errp) 287 { 288 return 0; 289 } 290 #endif 291 292 /* 293 * Get logical block size via ioctl. On success store it in @sector_size_p. 294 */ 295 static int probe_logical_blocksize(int fd, unsigned int *sector_size_p) 296 { 297 unsigned int sector_size; 298 bool success = false; 299 int i; 300 301 errno = ENOTSUP; 302 static const unsigned long ioctl_list[] = { 303 #ifdef BLKSSZGET 304 BLKSSZGET, 305 #endif 306 #ifdef DKIOCGETBLOCKSIZE 307 DKIOCGETBLOCKSIZE, 308 #endif 309 #ifdef DIOCGSECTORSIZE 310 DIOCGSECTORSIZE, 311 #endif 312 }; 313 314 /* Try a few ioctls to get the right size */ 315 for (i = 0; i < (int)ARRAY_SIZE(ioctl_list); i++) { 316 if (ioctl(fd, ioctl_list[i], §or_size) >= 0) { 317 *sector_size_p = sector_size; 318 success = true; 319 } 320 } 321 322 return success ? 0 : -errno; 323 } 324 325 /** 326 * Get physical block size of @fd. 327 * On success, store it in @blk_size and return 0. 328 * On failure, return -errno. 329 */ 330 static int probe_physical_blocksize(int fd, unsigned int *blk_size) 331 { 332 #ifdef BLKPBSZGET 333 if (ioctl(fd, BLKPBSZGET, blk_size) < 0) { 334 return -errno; 335 } 336 return 0; 337 #else 338 return -ENOTSUP; 339 #endif 340 } 341 342 /* 343 * Returns true if no alignment restrictions are necessary even for files 344 * opened with O_DIRECT. 345 * 346 * raw_probe_alignment() probes the required alignment and assume that 1 means 347 * the probing failed, so it falls back to a safe default of 4k. This can be 348 * avoided if we know that byte alignment is okay for the file. 349 */ 350 static bool dio_byte_aligned(int fd) 351 { 352 #ifdef __linux__ 353 struct statfs buf; 354 int ret; 355 356 ret = fstatfs(fd, &buf); 357 if (ret == 0 && buf.f_type == NFS_SUPER_MAGIC) { 358 return true; 359 } 360 #endif 361 return false; 362 } 363 364 static bool raw_needs_alignment(BlockDriverState *bs) 365 { 366 BDRVRawState *s = bs->opaque; 367 368 if ((bs->open_flags & BDRV_O_NOCACHE) != 0 && !dio_byte_aligned(s->fd)) { 369 return true; 370 } 371 372 return s->force_alignment; 373 } 374 375 /* Check if read is allowed with given memory buffer and length. 376 * 377 * This function is used to check O_DIRECT memory buffer and request alignment. 378 */ 379 static bool raw_is_io_aligned(int fd, void *buf, size_t len) 380 { 381 ssize_t ret = pread(fd, buf, len, 0); 382 383 if (ret >= 0) { 384 return true; 385 } 386 387 #ifdef __linux__ 388 /* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore 389 * other errors (e.g. real I/O error), which could happen on a failed 390 * drive, since we only care about probing alignment. 391 */ 392 if (errno != EINVAL) { 393 return true; 394 } 395 #endif 396 397 return false; 398 } 399 400 static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp) 401 { 402 BDRVRawState *s = bs->opaque; 403 char *buf; 404 size_t max_align = MAX(MAX_BLOCKSIZE, qemu_real_host_page_size()); 405 size_t alignments[] = {1, 512, 1024, 2048, 4096}; 406 407 /* For SCSI generic devices the alignment is not really used. 408 With buffered I/O, we don't have any restrictions. */ 409 if (bdrv_is_sg(bs) || !s->needs_alignment) { 410 bs->bl.request_alignment = 1; 411 s->buf_align = 1; 412 return; 413 } 414 415 bs->bl.request_alignment = 0; 416 s->buf_align = 0; 417 /* Let's try to use the logical blocksize for the alignment. */ 418 if (probe_logical_blocksize(fd, &bs->bl.request_alignment) < 0) { 419 bs->bl.request_alignment = 0; 420 } 421 422 #ifdef __linux__ 423 /* 424 * The XFS ioctl definitions are shipped in extra packages that might 425 * not always be available. Since we just need the XFS_IOC_DIOINFO ioctl 426 * here, we simply use our own definition instead: 427 */ 428 struct xfs_dioattr { 429 uint32_t d_mem; 430 uint32_t d_miniosz; 431 uint32_t d_maxiosz; 432 } da; 433 if (ioctl(fd, _IOR('X', 30, struct xfs_dioattr), &da) >= 0) { 434 bs->bl.request_alignment = da.d_miniosz; 435 /* The kernel returns wrong information for d_mem */ 436 /* s->buf_align = da.d_mem; */ 437 } 438 #endif 439 440 /* 441 * If we could not get the sizes so far, we can only guess them. First try 442 * to detect request alignment, since it is more likely to succeed. Then 443 * try to detect buf_align, which cannot be detected in some cases (e.g. 444 * Gluster). If buf_align cannot be detected, we fallback to the value of 445 * request_alignment. 446 */ 447 448 if (!bs->bl.request_alignment) { 449 int i; 450 size_t align; 451 buf = qemu_memalign(max_align, max_align); 452 for (i = 0; i < ARRAY_SIZE(alignments); i++) { 453 align = alignments[i]; 454 if (raw_is_io_aligned(fd, buf, align)) { 455 /* Fallback to safe value. */ 456 bs->bl.request_alignment = (align != 1) ? align : max_align; 457 break; 458 } 459 } 460 qemu_vfree(buf); 461 } 462 463 if (!s->buf_align) { 464 int i; 465 size_t align; 466 buf = qemu_memalign(max_align, 2 * max_align); 467 for (i = 0; i < ARRAY_SIZE(alignments); i++) { 468 align = alignments[i]; 469 if (raw_is_io_aligned(fd, buf + align, max_align)) { 470 /* Fallback to request_alignment. */ 471 s->buf_align = (align != 1) ? align : bs->bl.request_alignment; 472 break; 473 } 474 } 475 qemu_vfree(buf); 476 } 477 478 if (!s->buf_align || !bs->bl.request_alignment) { 479 error_setg(errp, "Could not find working O_DIRECT alignment"); 480 error_append_hint(errp, "Try cache.direct=off\n"); 481 } 482 } 483 484 static int check_hdev_writable(int fd) 485 { 486 #if defined(BLKROGET) 487 /* Linux block devices can be configured "read-only" using blockdev(8). 488 * This is independent of device node permissions and therefore open(2) 489 * with O_RDWR succeeds. Actual writes fail with EPERM. 490 * 491 * bdrv_open() is supposed to fail if the disk is read-only. Explicitly 492 * check for read-only block devices so that Linux block devices behave 493 * properly. 494 */ 495 struct stat st; 496 int readonly = 0; 497 498 if (fstat(fd, &st)) { 499 return -errno; 500 } 501 502 if (!S_ISBLK(st.st_mode)) { 503 return 0; 504 } 505 506 if (ioctl(fd, BLKROGET, &readonly) < 0) { 507 return -errno; 508 } 509 510 if (readonly) { 511 return -EACCES; 512 } 513 #endif /* defined(BLKROGET) */ 514 return 0; 515 } 516 517 static void raw_parse_flags(int bdrv_flags, int *open_flags, bool has_writers) 518 { 519 bool read_write = false; 520 assert(open_flags != NULL); 521 522 *open_flags |= O_BINARY; 523 *open_flags &= ~O_ACCMODE; 524 525 if (bdrv_flags & BDRV_O_AUTO_RDONLY) { 526 read_write = has_writers; 527 } else if (bdrv_flags & BDRV_O_RDWR) { 528 read_write = true; 529 } 530 531 if (read_write) { 532 *open_flags |= O_RDWR; 533 } else { 534 *open_flags |= O_RDONLY; 535 } 536 537 /* Use O_DSYNC for write-through caching, no flags for write-back caching, 538 * and O_DIRECT for no caching. */ 539 if ((bdrv_flags & BDRV_O_NOCACHE)) { 540 *open_flags |= O_DIRECT; 541 } 542 } 543 544 static void raw_parse_filename(const char *filename, QDict *options, 545 Error **errp) 546 { 547 bdrv_parse_filename_strip_prefix(filename, "file:", options); 548 } 549 550 static QemuOptsList raw_runtime_opts = { 551 .name = "raw", 552 .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head), 553 .desc = { 554 { 555 .name = "filename", 556 .type = QEMU_OPT_STRING, 557 .help = "File name of the image", 558 }, 559 { 560 .name = "aio", 561 .type = QEMU_OPT_STRING, 562 .help = "host AIO implementation (threads, native, io_uring)", 563 }, 564 { 565 .name = "aio-max-batch", 566 .type = QEMU_OPT_NUMBER, 567 .help = "AIO max batch size (0 = auto handled by AIO backend, default: 0)", 568 }, 569 { 570 .name = "locking", 571 .type = QEMU_OPT_STRING, 572 .help = "file locking mode (on/off/auto, default: auto)", 573 }, 574 { 575 .name = "pr-manager", 576 .type = QEMU_OPT_STRING, 577 .help = "id of persistent reservation manager object (default: none)", 578 }, 579 #if defined(__linux__) 580 { 581 .name = "drop-cache", 582 .type = QEMU_OPT_BOOL, 583 .help = "invalidate page cache during live migration (default: on)", 584 }, 585 #endif 586 { 587 .name = "x-check-cache-dropped", 588 .type = QEMU_OPT_BOOL, 589 .help = "check that page cache was dropped on live migration (default: off)" 590 }, 591 { /* end of list */ } 592 }, 593 }; 594 595 static const char *const mutable_opts[] = { "x-check-cache-dropped", NULL }; 596 597 static int raw_open_common(BlockDriverState *bs, QDict *options, 598 int bdrv_flags, int open_flags, 599 bool device, Error **errp) 600 { 601 BDRVRawState *s = bs->opaque; 602 QemuOpts *opts; 603 Error *local_err = NULL; 604 const char *filename = NULL; 605 const char *str; 606 BlockdevAioOptions aio, aio_default; 607 int fd, ret; 608 struct stat st; 609 OnOffAuto locking; 610 611 opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); 612 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 613 ret = -EINVAL; 614 goto fail; 615 } 616 617 filename = qemu_opt_get(opts, "filename"); 618 619 ret = raw_normalize_devicepath(&filename, errp); 620 if (ret != 0) { 621 goto fail; 622 } 623 624 if (bdrv_flags & BDRV_O_NATIVE_AIO) { 625 aio_default = BLOCKDEV_AIO_OPTIONS_NATIVE; 626 #ifdef CONFIG_LINUX_IO_URING 627 } else if (bdrv_flags & BDRV_O_IO_URING) { 628 aio_default = BLOCKDEV_AIO_OPTIONS_IO_URING; 629 #endif 630 } else { 631 aio_default = BLOCKDEV_AIO_OPTIONS_THREADS; 632 } 633 634 aio = qapi_enum_parse(&BlockdevAioOptions_lookup, 635 qemu_opt_get(opts, "aio"), 636 aio_default, &local_err); 637 if (local_err) { 638 error_propagate(errp, local_err); 639 ret = -EINVAL; 640 goto fail; 641 } 642 643 s->use_linux_aio = (aio == BLOCKDEV_AIO_OPTIONS_NATIVE); 644 #ifdef CONFIG_LINUX_IO_URING 645 s->use_linux_io_uring = (aio == BLOCKDEV_AIO_OPTIONS_IO_URING); 646 #endif 647 648 s->aio_max_batch = qemu_opt_get_number(opts, "aio-max-batch", 0); 649 650 locking = qapi_enum_parse(&OnOffAuto_lookup, 651 qemu_opt_get(opts, "locking"), 652 ON_OFF_AUTO_AUTO, &local_err); 653 if (local_err) { 654 error_propagate(errp, local_err); 655 ret = -EINVAL; 656 goto fail; 657 } 658 switch (locking) { 659 case ON_OFF_AUTO_ON: 660 s->use_lock = true; 661 if (!qemu_has_ofd_lock()) { 662 warn_report("File lock requested but OFD locking syscall is " 663 "unavailable, falling back to POSIX file locks"); 664 error_printf("Due to the implementation, locks can be lost " 665 "unexpectedly.\n"); 666 } 667 break; 668 case ON_OFF_AUTO_OFF: 669 s->use_lock = false; 670 break; 671 case ON_OFF_AUTO_AUTO: 672 s->use_lock = qemu_has_ofd_lock(); 673 break; 674 default: 675 abort(); 676 } 677 678 str = qemu_opt_get(opts, "pr-manager"); 679 if (str) { 680 s->pr_mgr = pr_manager_lookup(str, &local_err); 681 if (local_err) { 682 error_propagate(errp, local_err); 683 ret = -EINVAL; 684 goto fail; 685 } 686 } 687 688 s->drop_cache = qemu_opt_get_bool(opts, "drop-cache", true); 689 s->check_cache_dropped = qemu_opt_get_bool(opts, "x-check-cache-dropped", 690 false); 691 692 s->open_flags = open_flags; 693 raw_parse_flags(bdrv_flags, &s->open_flags, false); 694 695 s->fd = -1; 696 fd = qemu_open(filename, s->open_flags, errp); 697 ret = fd < 0 ? -errno : 0; 698 699 if (ret < 0) { 700 if (ret == -EROFS) { 701 ret = -EACCES; 702 } 703 goto fail; 704 } 705 s->fd = fd; 706 707 /* Check s->open_flags rather than bdrv_flags due to auto-read-only */ 708 if (s->open_flags & O_RDWR) { 709 ret = check_hdev_writable(s->fd); 710 if (ret < 0) { 711 error_setg_errno(errp, -ret, "The device is not writable"); 712 goto fail; 713 } 714 } 715 716 s->perm = 0; 717 s->shared_perm = BLK_PERM_ALL; 718 719 #ifdef CONFIG_LINUX_AIO 720 /* Currently Linux does AIO only for files opened with O_DIRECT */ 721 if (s->use_linux_aio && !(s->open_flags & O_DIRECT)) { 722 error_setg(errp, "aio=native was specified, but it requires " 723 "cache.direct=on, which was not specified."); 724 ret = -EINVAL; 725 goto fail; 726 } 727 if (s->use_linux_aio) { 728 s->has_laio_fdsync = laio_has_fdsync(s->fd); 729 } 730 #else 731 if (s->use_linux_aio) { 732 error_setg(errp, "aio=native was specified, but is not supported " 733 "in this build."); 734 ret = -EINVAL; 735 goto fail; 736 } 737 #endif /* !defined(CONFIG_LINUX_AIO) */ 738 739 #ifndef CONFIG_LINUX_IO_URING 740 if (s->use_linux_io_uring) { 741 error_setg(errp, "aio=io_uring was specified, but is not supported " 742 "in this build."); 743 ret = -EINVAL; 744 goto fail; 745 } 746 #endif /* !defined(CONFIG_LINUX_IO_URING) */ 747 748 s->has_discard = true; 749 s->has_write_zeroes = true; 750 751 if (fstat(s->fd, &st) < 0) { 752 ret = -errno; 753 error_setg_errno(errp, errno, "Could not stat file"); 754 goto fail; 755 } 756 757 if (!device) { 758 if (!S_ISREG(st.st_mode)) { 759 error_setg(errp, "'%s' driver requires '%s' to be a regular file", 760 bs->drv->format_name, bs->filename); 761 ret = -EINVAL; 762 goto fail; 763 } else { 764 s->has_fallocate = true; 765 } 766 } else { 767 if (!(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { 768 error_setg(errp, "'%s' driver requires '%s' to be either " 769 "a character or block device", 770 bs->drv->format_name, bs->filename); 771 ret = -EINVAL; 772 goto fail; 773 } 774 } 775 #ifdef CONFIG_BLKZONED 776 /* 777 * The kernel page cache does not reliably work for writes to SWR zones 778 * of zoned block device because it can not guarantee the order of writes. 779 */ 780 if ((bs->bl.zoned != BLK_Z_NONE) && 781 (!(s->open_flags & O_DIRECT))) { 782 error_setg(errp, "The driver supports zoned devices, and it requires " 783 "cache.direct=on, which was not specified."); 784 return -EINVAL; /* No host kernel page cache */ 785 } 786 #endif 787 788 if (S_ISBLK(st.st_mode)) { 789 #ifdef __linux__ 790 /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do 791 * not rely on the contents of discarded blocks unless using O_DIRECT. 792 * Same for BLKZEROOUT. 793 */ 794 if (!(bs->open_flags & BDRV_O_NOCACHE)) { 795 s->has_write_zeroes = false; 796 } 797 #endif 798 } 799 #ifdef __FreeBSD__ 800 if (S_ISCHR(st.st_mode)) { 801 /* 802 * The file is a char device (disk), which on FreeBSD isn't behind 803 * a pager, so force all requests to be aligned. This is needed 804 * so QEMU makes sure all IO operations on the device are aligned 805 * to sector size, or else FreeBSD will reject them with EINVAL. 806 */ 807 s->force_alignment = true; 808 } 809 #endif 810 s->needs_alignment = raw_needs_alignment(bs); 811 812 bs->supported_write_flags = BDRV_REQ_FUA; 813 if (s->use_linux_aio && !laio_has_fua()) { 814 bs->supported_write_flags &= ~BDRV_REQ_FUA; 815 } else if (s->use_linux_io_uring && !luring_has_fua()) { 816 bs->supported_write_flags &= ~BDRV_REQ_FUA; 817 } 818 819 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK; 820 if (S_ISREG(st.st_mode)) { 821 /* When extending regular files, we get zeros from the OS */ 822 bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE; 823 } 824 ret = 0; 825 fail: 826 if (ret < 0 && s->fd != -1) { 827 qemu_close(s->fd); 828 } 829 if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) { 830 unlink(filename); 831 } 832 qemu_opts_del(opts); 833 return ret; 834 } 835 836 static int raw_open(BlockDriverState *bs, QDict *options, int flags, 837 Error **errp) 838 { 839 BDRVRawState *s = bs->opaque; 840 841 s->type = FTYPE_FILE; 842 return raw_open_common(bs, options, flags, 0, false, errp); 843 } 844 845 typedef enum { 846 RAW_PL_PREPARE, 847 RAW_PL_COMMIT, 848 RAW_PL_ABORT, 849 } RawPermLockOp; 850 851 #define PERM_FOREACH(i) \ 852 for ((i) = 0; (1ULL << (i)) <= BLK_PERM_ALL; i++) 853 854 /* Lock bytes indicated by @perm_lock_bits and @shared_perm_lock_bits in the 855 * file; if @unlock == true, also unlock the unneeded bytes. 856 * @shared_perm_lock_bits is the mask of all permissions that are NOT shared. 857 */ 858 static int raw_apply_lock_bytes(BDRVRawState *s, int fd, 859 uint64_t perm_lock_bits, 860 uint64_t shared_perm_lock_bits, 861 bool unlock, Error **errp) 862 { 863 int ret; 864 int i; 865 uint64_t locked_perm, locked_shared_perm; 866 867 if (s) { 868 locked_perm = s->locked_perm; 869 locked_shared_perm = s->locked_shared_perm; 870 } else { 871 /* 872 * We don't have the previous bits, just lock/unlock for each of the 873 * requested bits. 874 */ 875 if (unlock) { 876 locked_perm = BLK_PERM_ALL; 877 locked_shared_perm = BLK_PERM_ALL; 878 } else { 879 locked_perm = 0; 880 locked_shared_perm = 0; 881 } 882 } 883 884 PERM_FOREACH(i) { 885 int off = RAW_LOCK_PERM_BASE + i; 886 uint64_t bit = (1ULL << i); 887 if ((perm_lock_bits & bit) && !(locked_perm & bit)) { 888 ret = qemu_lock_fd(fd, off, 1, false); 889 if (ret) { 890 raw_lock_error_setg_errno(errp, -ret, "Failed to lock byte %d", 891 off); 892 return ret; 893 } else if (s) { 894 s->locked_perm |= bit; 895 } 896 } else if (unlock && (locked_perm & bit) && !(perm_lock_bits & bit)) { 897 ret = qemu_unlock_fd(fd, off, 1); 898 if (ret) { 899 error_setg_errno(errp, -ret, "Failed to unlock byte %d", off); 900 return ret; 901 } else if (s) { 902 s->locked_perm &= ~bit; 903 } 904 } 905 } 906 PERM_FOREACH(i) { 907 int off = RAW_LOCK_SHARED_BASE + i; 908 uint64_t bit = (1ULL << i); 909 if ((shared_perm_lock_bits & bit) && !(locked_shared_perm & bit)) { 910 ret = qemu_lock_fd(fd, off, 1, false); 911 if (ret) { 912 raw_lock_error_setg_errno(errp, -ret, "Failed to lock byte %d", 913 off); 914 return ret; 915 } else if (s) { 916 s->locked_shared_perm |= bit; 917 } 918 } else if (unlock && (locked_shared_perm & bit) && 919 !(shared_perm_lock_bits & bit)) { 920 ret = qemu_unlock_fd(fd, off, 1); 921 if (ret) { 922 error_setg_errno(errp, -ret, "Failed to unlock byte %d", off); 923 return ret; 924 } else if (s) { 925 s->locked_shared_perm &= ~bit; 926 } 927 } 928 } 929 return 0; 930 } 931 932 /* Check "unshared" bytes implied by @perm and ~@shared_perm in the file. */ 933 static int raw_check_lock_bytes(int fd, uint64_t perm, uint64_t shared_perm, 934 Error **errp) 935 { 936 int ret; 937 int i; 938 939 PERM_FOREACH(i) { 940 int off = RAW_LOCK_SHARED_BASE + i; 941 uint64_t p = 1ULL << i; 942 if (perm & p) { 943 ret = qemu_lock_fd_test(fd, off, 1, true); 944 if (ret) { 945 char *perm_name = bdrv_perm_names(p); 946 947 raw_lock_error_setg_errno(errp, -ret, 948 "Failed to get \"%s\" lock", 949 perm_name); 950 g_free(perm_name); 951 return ret; 952 } 953 } 954 } 955 PERM_FOREACH(i) { 956 int off = RAW_LOCK_PERM_BASE + i; 957 uint64_t p = 1ULL << i; 958 if (!(shared_perm & p)) { 959 ret = qemu_lock_fd_test(fd, off, 1, true); 960 if (ret) { 961 char *perm_name = bdrv_perm_names(p); 962 963 raw_lock_error_setg_errno(errp, -ret, 964 "Failed to get shared \"%s\" lock", 965 perm_name); 966 g_free(perm_name); 967 return ret; 968 } 969 } 970 } 971 return 0; 972 } 973 974 static int raw_handle_perm_lock(BlockDriverState *bs, 975 RawPermLockOp op, 976 uint64_t new_perm, uint64_t new_shared, 977 Error **errp) 978 { 979 BDRVRawState *s = bs->opaque; 980 int ret = 0; 981 Error *local_err = NULL; 982 983 if (!s->use_lock) { 984 return 0; 985 } 986 987 if (bdrv_get_flags(bs) & BDRV_O_INACTIVE) { 988 return 0; 989 } 990 991 switch (op) { 992 case RAW_PL_PREPARE: 993 if ((s->perm | new_perm) == s->perm && 994 (s->shared_perm & new_shared) == s->shared_perm) 995 { 996 /* 997 * We are going to unlock bytes, it should not fail. If it fail due 998 * to some fs-dependent permission-unrelated reasons (which occurs 999 * sometimes on NFS and leads to abort in bdrv_replace_child) we 1000 * can't prevent such errors by any check here. And we ignore them 1001 * anyway in ABORT and COMMIT. 1002 */ 1003 return 0; 1004 } 1005 ret = raw_apply_lock_bytes(s, s->fd, s->perm | new_perm, 1006 ~s->shared_perm | ~new_shared, 1007 false, errp); 1008 if (!ret) { 1009 ret = raw_check_lock_bytes(s->fd, new_perm, new_shared, errp); 1010 if (!ret) { 1011 return 0; 1012 } 1013 error_append_hint(errp, 1014 "Is another process using the image [%s]?\n", 1015 bs->filename); 1016 } 1017 /* fall through to unlock bytes. */ 1018 case RAW_PL_ABORT: 1019 raw_apply_lock_bytes(s, s->fd, s->perm, ~s->shared_perm, 1020 true, &local_err); 1021 if (local_err) { 1022 /* Theoretically the above call only unlocks bytes and it cannot 1023 * fail. Something weird happened, report it. 1024 */ 1025 warn_report_err(local_err); 1026 } 1027 break; 1028 case RAW_PL_COMMIT: 1029 raw_apply_lock_bytes(s, s->fd, new_perm, ~new_shared, 1030 true, &local_err); 1031 if (local_err) { 1032 /* Theoretically the above call only unlocks bytes and it cannot 1033 * fail. Something weird happened, report it. 1034 */ 1035 warn_report_err(local_err); 1036 } 1037 break; 1038 } 1039 return ret; 1040 } 1041 1042 /* Sets a specific flag */ 1043 static int fcntl_setfl(int fd, int flag) 1044 { 1045 int flags; 1046 1047 flags = fcntl(fd, F_GETFL); 1048 if (flags == -1) { 1049 return -errno; 1050 } 1051 if (fcntl(fd, F_SETFL, flags | flag) == -1) { 1052 return -errno; 1053 } 1054 return 0; 1055 } 1056 1057 static int raw_reconfigure_getfd(BlockDriverState *bs, int flags, 1058 int *open_flags, uint64_t perm, Error **errp) 1059 { 1060 BDRVRawState *s = bs->opaque; 1061 int fd = -1; 1062 int ret; 1063 bool has_writers = perm & 1064 (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED | BLK_PERM_RESIZE); 1065 int fcntl_flags = O_APPEND | O_NONBLOCK; 1066 #ifdef O_NOATIME 1067 fcntl_flags |= O_NOATIME; 1068 #endif 1069 1070 *open_flags = 0; 1071 if (s->type == FTYPE_CD) { 1072 *open_flags |= O_NONBLOCK; 1073 } 1074 1075 raw_parse_flags(flags, open_flags, has_writers); 1076 1077 #ifdef O_ASYNC 1078 /* Not all operating systems have O_ASYNC, and those that don't 1079 * will not let us track the state into rs->open_flags (typically 1080 * you achieve the same effect with an ioctl, for example I_SETSIG 1081 * on Solaris). But we do not use O_ASYNC, so that's fine. 1082 */ 1083 assert((s->open_flags & O_ASYNC) == 0); 1084 #endif 1085 1086 if (*open_flags == s->open_flags) { 1087 /* We're lucky, the existing fd is fine */ 1088 return s->fd; 1089 } 1090 1091 if ((*open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) { 1092 /* dup the original fd */ 1093 fd = qemu_dup(s->fd); 1094 if (fd >= 0) { 1095 ret = fcntl_setfl(fd, *open_flags); 1096 if (ret) { 1097 qemu_close(fd); 1098 fd = -1; 1099 } 1100 } 1101 } 1102 1103 /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */ 1104 if (fd == -1) { 1105 const char *normalized_filename = bs->filename; 1106 ret = raw_normalize_devicepath(&normalized_filename, errp); 1107 if (ret >= 0) { 1108 fd = qemu_open(normalized_filename, *open_flags, errp); 1109 if (fd == -1) { 1110 return -1; 1111 } 1112 } 1113 } 1114 1115 if (fd != -1 && (*open_flags & O_RDWR)) { 1116 ret = check_hdev_writable(fd); 1117 if (ret < 0) { 1118 qemu_close(fd); 1119 error_setg_errno(errp, -ret, "The device is not writable"); 1120 return -1; 1121 } 1122 } 1123 1124 return fd; 1125 } 1126 1127 static int raw_reopen_prepare(BDRVReopenState *state, 1128 BlockReopenQueue *queue, Error **errp) 1129 { 1130 BDRVRawState *s; 1131 BDRVRawReopenState *rs; 1132 QemuOpts *opts; 1133 int ret; 1134 1135 assert(state != NULL); 1136 assert(state->bs != NULL); 1137 1138 s = state->bs->opaque; 1139 1140 state->opaque = g_new0(BDRVRawReopenState, 1); 1141 rs = state->opaque; 1142 1143 /* Handle options changes */ 1144 opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); 1145 if (!qemu_opts_absorb_qdict(opts, state->options, errp)) { 1146 ret = -EINVAL; 1147 goto out; 1148 } 1149 1150 rs->drop_cache = qemu_opt_get_bool_del(opts, "drop-cache", true); 1151 rs->check_cache_dropped = 1152 qemu_opt_get_bool_del(opts, "x-check-cache-dropped", false); 1153 1154 /* This driver's reopen function doesn't currently allow changing 1155 * other options, so let's put them back in the original QDict and 1156 * bdrv_reopen_prepare() will detect changes and complain. */ 1157 qemu_opts_to_qdict(opts, state->options); 1158 1159 /* 1160 * As part of reopen prepare we also want to create new fd by 1161 * raw_reconfigure_getfd(). But it wants updated "perm", when in 1162 * bdrv_reopen_multiple() .bdrv_reopen_prepare() callback called prior to 1163 * permission update. Happily, permission update is always a part 1164 * (a separate stage) of bdrv_reopen_multiple() so we can rely on this 1165 * fact and reconfigure fd in raw_check_perm(). 1166 */ 1167 1168 s->reopen_state = state; 1169 ret = 0; 1170 1171 out: 1172 qemu_opts_del(opts); 1173 return ret; 1174 } 1175 1176 static void raw_reopen_commit(BDRVReopenState *state) 1177 { 1178 BDRVRawReopenState *rs = state->opaque; 1179 BDRVRawState *s = state->bs->opaque; 1180 1181 s->drop_cache = rs->drop_cache; 1182 s->check_cache_dropped = rs->check_cache_dropped; 1183 s->open_flags = rs->open_flags; 1184 g_free(state->opaque); 1185 state->opaque = NULL; 1186 1187 assert(s->reopen_state == state); 1188 s->reopen_state = NULL; 1189 } 1190 1191 1192 static void raw_reopen_abort(BDRVReopenState *state) 1193 { 1194 BDRVRawReopenState *rs = state->opaque; 1195 BDRVRawState *s = state->bs->opaque; 1196 1197 /* nothing to do if NULL, we didn't get far enough */ 1198 if (rs == NULL) { 1199 return; 1200 } 1201 1202 g_free(state->opaque); 1203 state->opaque = NULL; 1204 1205 assert(s->reopen_state == state); 1206 s->reopen_state = NULL; 1207 } 1208 1209 static int hdev_get_max_hw_transfer(int fd, struct stat *st) 1210 { 1211 #ifdef BLKSECTGET 1212 if (S_ISBLK(st->st_mode)) { 1213 unsigned short max_sectors = 0; 1214 if (ioctl(fd, BLKSECTGET, &max_sectors) == 0) { 1215 return max_sectors * 512; 1216 } 1217 } else { 1218 int max_bytes = 0; 1219 if (ioctl(fd, BLKSECTGET, &max_bytes) == 0) { 1220 return max_bytes; 1221 } 1222 } 1223 return -errno; 1224 #else 1225 return -ENOSYS; 1226 #endif 1227 } 1228 1229 /* 1230 * Get a sysfs attribute value as character string. 1231 */ 1232 #ifdef CONFIG_LINUX 1233 static int get_sysfs_str_val(struct stat *st, const char *attribute, 1234 char **val) { 1235 g_autofree char *sysfspath = NULL; 1236 size_t len; 1237 1238 if (!S_ISBLK(st->st_mode)) { 1239 return -ENOTSUP; 1240 } 1241 1242 sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/%s", 1243 major(st->st_rdev), minor(st->st_rdev), 1244 attribute); 1245 if (!g_file_get_contents(sysfspath, val, &len, NULL)) { 1246 return -ENOENT; 1247 } 1248 1249 /* The file is ended with '\n' */ 1250 char *p; 1251 p = *val; 1252 if (*(p + len - 1) == '\n') { 1253 *(p + len - 1) = '\0'; 1254 } 1255 return 0; 1256 } 1257 #endif 1258 1259 #if defined(CONFIG_BLKZONED) 1260 static int get_sysfs_zoned_model(struct stat *st, BlockZoneModel *zoned) 1261 { 1262 g_autofree char *val = NULL; 1263 int ret; 1264 1265 ret = get_sysfs_str_val(st, "zoned", &val); 1266 if (ret < 0) { 1267 return ret; 1268 } 1269 1270 if (strcmp(val, "host-managed") == 0) { 1271 *zoned = BLK_Z_HM; 1272 } else if (strcmp(val, "host-aware") == 0) { 1273 *zoned = BLK_Z_HA; 1274 } else if (strcmp(val, "none") == 0) { 1275 *zoned = BLK_Z_NONE; 1276 } else { 1277 return -ENOTSUP; 1278 } 1279 return 0; 1280 } 1281 #endif /* defined(CONFIG_BLKZONED) */ 1282 1283 #ifdef CONFIG_LINUX 1284 /* 1285 * Get a sysfs attribute value as a long integer. 1286 */ 1287 static long get_sysfs_long_val(struct stat *st, const char *attribute) 1288 { 1289 g_autofree char *str = NULL; 1290 const char *end; 1291 long val; 1292 int ret; 1293 1294 ret = get_sysfs_str_val(st, attribute, &str); 1295 if (ret < 0) { 1296 return ret; 1297 } 1298 1299 /* The file is ended with '\n', pass 'end' to accept that. */ 1300 ret = qemu_strtol(str, &end, 10, &val); 1301 if (ret == 0 && end && *end == '\0') { 1302 ret = val; 1303 } 1304 return ret; 1305 } 1306 1307 /* 1308 * Get a sysfs attribute value as a uint32_t. 1309 */ 1310 static int get_sysfs_u32_val(struct stat *st, const char *attribute, 1311 uint32_t *u32) 1312 { 1313 g_autofree char *str = NULL; 1314 const char *end; 1315 unsigned int val; 1316 int ret; 1317 1318 ret = get_sysfs_str_val(st, attribute, &str); 1319 if (ret < 0) { 1320 return ret; 1321 } 1322 1323 /* The file is ended with '\n', pass 'end' to accept that. */ 1324 ret = qemu_strtoui(str, &end, 10, &val); 1325 if (ret == 0 && end && *end == '\0') { 1326 *u32 = val; 1327 } 1328 return ret; 1329 } 1330 #endif 1331 1332 static int hdev_get_max_segments(int fd, struct stat *st) 1333 { 1334 #ifdef CONFIG_LINUX 1335 int ret; 1336 1337 if (S_ISCHR(st->st_mode)) { 1338 if (ioctl(fd, SG_GET_SG_TABLESIZE, &ret) == 0) { 1339 return ret; 1340 } 1341 return -ENOTSUP; 1342 } 1343 return get_sysfs_long_val(st, "max_segments"); 1344 #else 1345 return -ENOTSUP; 1346 #endif 1347 } 1348 1349 /* 1350 * Fills in *dalign with the discard alignment and returns 0 on success, 1351 * -errno otherwise. 1352 */ 1353 static int hdev_get_pdiscard_alignment(struct stat *st, uint32_t *dalign) 1354 { 1355 #ifdef CONFIG_LINUX 1356 /* 1357 * Note that Linux "discard_granularity" is QEMU "discard_alignment". Linux 1358 * "discard_alignment" is something else. 1359 */ 1360 return get_sysfs_u32_val(st, "discard_granularity", dalign); 1361 #else 1362 return -ENOTSUP; 1363 #endif 1364 } 1365 1366 #if defined(CONFIG_BLKZONED) 1367 /* 1368 * If the reset_all flag is true, then the wps of zone whose state is 1369 * not readonly or offline should be all reset to the start sector. 1370 * Else, take the real wp of the device. 1371 */ 1372 static int get_zones_wp(BlockDriverState *bs, int fd, int64_t offset, 1373 unsigned int nrz, bool reset_all) 1374 { 1375 struct blk_zone *blkz; 1376 size_t rep_size; 1377 uint64_t sector = offset >> BDRV_SECTOR_BITS; 1378 BlockZoneWps *wps = bs->wps; 1379 unsigned int j = offset / bs->bl.zone_size; 1380 unsigned int n = 0, i = 0; 1381 int ret; 1382 rep_size = sizeof(struct blk_zone_report) + nrz * sizeof(struct blk_zone); 1383 g_autofree struct blk_zone_report *rep = NULL; 1384 1385 rep = g_malloc(rep_size); 1386 blkz = (struct blk_zone *)(rep + 1); 1387 while (n < nrz) { 1388 memset(rep, 0, rep_size); 1389 rep->sector = sector; 1390 rep->nr_zones = nrz - n; 1391 1392 do { 1393 ret = ioctl(fd, BLKREPORTZONE, rep); 1394 } while (ret != 0 && errno == EINTR); 1395 if (ret != 0) { 1396 error_report("%d: ioctl BLKREPORTZONE at %" PRId64 " failed %d", 1397 fd, offset, errno); 1398 return -errno; 1399 } 1400 1401 if (!rep->nr_zones) { 1402 break; 1403 } 1404 1405 for (i = 0; i < rep->nr_zones; ++i, ++n, ++j) { 1406 /* 1407 * The wp tracking cares only about sequential writes required and 1408 * sequential write preferred zones so that the wp can advance to 1409 * the right location. 1410 * Use the most significant bit of the wp location to indicate the 1411 * zone type: 0 for SWR/SWP zones and 1 for conventional zones. 1412 */ 1413 if (blkz[i].type == BLK_ZONE_TYPE_CONVENTIONAL) { 1414 wps->wp[j] |= 1ULL << 63; 1415 } else { 1416 switch(blkz[i].cond) { 1417 case BLK_ZONE_COND_FULL: 1418 case BLK_ZONE_COND_READONLY: 1419 /* Zone not writable */ 1420 wps->wp[j] = (blkz[i].start + blkz[i].len) << BDRV_SECTOR_BITS; 1421 break; 1422 case BLK_ZONE_COND_OFFLINE: 1423 /* Zone not writable nor readable */ 1424 wps->wp[j] = (blkz[i].start) << BDRV_SECTOR_BITS; 1425 break; 1426 default: 1427 if (reset_all) { 1428 wps->wp[j] = blkz[i].start << BDRV_SECTOR_BITS; 1429 } else { 1430 wps->wp[j] = blkz[i].wp << BDRV_SECTOR_BITS; 1431 } 1432 break; 1433 } 1434 } 1435 } 1436 sector = blkz[i - 1].start + blkz[i - 1].len; 1437 } 1438 1439 return 0; 1440 } 1441 1442 static void update_zones_wp(BlockDriverState *bs, int fd, int64_t offset, 1443 unsigned int nrz) 1444 { 1445 if (get_zones_wp(bs, fd, offset, nrz, 0) < 0) { 1446 error_report("update zone wp failed"); 1447 } 1448 } 1449 1450 static void raw_refresh_zoned_limits(BlockDriverState *bs, struct stat *st, 1451 Error **errp) 1452 { 1453 BDRVRawState *s = bs->opaque; 1454 BlockZoneModel zoned = BLK_Z_NONE; 1455 int ret; 1456 1457 ret = get_sysfs_zoned_model(st, &zoned); 1458 if (ret < 0 || zoned == BLK_Z_NONE) { 1459 goto no_zoned; 1460 } 1461 bs->bl.zoned = zoned; 1462 1463 ret = get_sysfs_long_val(st, "max_open_zones"); 1464 if (ret >= 0) { 1465 bs->bl.max_open_zones = ret; 1466 } 1467 1468 ret = get_sysfs_long_val(st, "max_active_zones"); 1469 if (ret >= 0) { 1470 bs->bl.max_active_zones = ret; 1471 } 1472 1473 /* 1474 * The zoned device must at least have zone size and nr_zones fields. 1475 */ 1476 ret = get_sysfs_long_val(st, "chunk_sectors"); 1477 if (ret < 0) { 1478 error_setg_errno(errp, -ret, "Unable to read chunk_sectors " 1479 "sysfs attribute"); 1480 goto no_zoned; 1481 } else if (!ret) { 1482 error_setg(errp, "Read 0 from chunk_sectors sysfs attribute"); 1483 goto no_zoned; 1484 } 1485 bs->bl.zone_size = ret << BDRV_SECTOR_BITS; 1486 1487 ret = get_sysfs_long_val(st, "nr_zones"); 1488 if (ret < 0) { 1489 error_setg_errno(errp, -ret, "Unable to read nr_zones " 1490 "sysfs attribute"); 1491 goto no_zoned; 1492 } else if (!ret) { 1493 error_setg(errp, "Read 0 from nr_zones sysfs attribute"); 1494 goto no_zoned; 1495 } 1496 bs->bl.nr_zones = ret; 1497 1498 ret = get_sysfs_long_val(st, "zone_append_max_bytes"); 1499 if (ret > 0) { 1500 bs->bl.max_append_sectors = ret >> BDRV_SECTOR_BITS; 1501 } 1502 1503 ret = get_sysfs_long_val(st, "physical_block_size"); 1504 if (ret >= 0) { 1505 bs->bl.write_granularity = ret; 1506 } 1507 1508 /* The refresh_limits() function can be called multiple times. */ 1509 g_free(bs->wps); 1510 bs->wps = g_malloc(sizeof(BlockZoneWps) + 1511 sizeof(int64_t) * bs->bl.nr_zones); 1512 ret = get_zones_wp(bs, s->fd, 0, bs->bl.nr_zones, 0); 1513 if (ret < 0) { 1514 error_setg_errno(errp, -ret, "report wps failed"); 1515 goto no_zoned; 1516 } 1517 qemu_co_mutex_init(&bs->wps->colock); 1518 return; 1519 1520 no_zoned: 1521 bs->bl.zoned = BLK_Z_NONE; 1522 g_free(bs->wps); 1523 bs->wps = NULL; 1524 } 1525 #else /* !defined(CONFIG_BLKZONED) */ 1526 static void raw_refresh_zoned_limits(BlockDriverState *bs, struct stat *st, 1527 Error **errp) 1528 { 1529 bs->bl.zoned = BLK_Z_NONE; 1530 } 1531 #endif /* !defined(CONFIG_BLKZONED) */ 1532 1533 static void raw_refresh_limits(BlockDriverState *bs, Error **errp) 1534 { 1535 BDRVRawState *s = bs->opaque; 1536 struct stat st; 1537 1538 s->needs_alignment = raw_needs_alignment(bs); 1539 raw_probe_alignment(bs, s->fd, errp); 1540 1541 bs->bl.min_mem_alignment = s->buf_align; 1542 bs->bl.opt_mem_alignment = MAX(s->buf_align, qemu_real_host_page_size()); 1543 1544 /* 1545 * Maximum transfers are best effort, so it is okay to ignore any 1546 * errors. That said, based on the man page errors in fstat would be 1547 * very much unexpected; the only possible case seems to be ENOMEM. 1548 */ 1549 if (fstat(s->fd, &st)) { 1550 return; 1551 } 1552 1553 #if defined(__APPLE__) && (__MACH__) 1554 struct statfs buf; 1555 1556 if (!fstatfs(s->fd, &buf)) { 1557 bs->bl.opt_transfer = buf.f_iosize; 1558 bs->bl.pdiscard_alignment = buf.f_bsize; 1559 } 1560 #endif 1561 1562 if (bdrv_is_sg(bs) || S_ISBLK(st.st_mode)) { 1563 int ret = hdev_get_max_hw_transfer(s->fd, &st); 1564 1565 if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) { 1566 bs->bl.max_hw_transfer = ret; 1567 } 1568 1569 ret = hdev_get_max_segments(s->fd, &st); 1570 if (ret > 0) { 1571 bs->bl.max_hw_iov = ret; 1572 } 1573 } 1574 1575 if (S_ISBLK(st.st_mode)) { 1576 uint32_t dalign = 0; 1577 int ret; 1578 1579 ret = hdev_get_pdiscard_alignment(&st, &dalign); 1580 if (ret == 0 && dalign != 0) { 1581 uint32_t ralign = bs->bl.request_alignment; 1582 1583 /* Probably never happens, but handle it just in case */ 1584 if (dalign < ralign && (ralign % dalign == 0)) { 1585 dalign = ralign; 1586 } 1587 1588 /* The block layer requires a multiple of request_alignment */ 1589 if (dalign % ralign != 0) { 1590 error_setg(errp, "Invalid pdiscard_alignment limit %u is not a " 1591 "multiple of request_alignment %u", dalign, ralign); 1592 return; 1593 } 1594 1595 bs->bl.pdiscard_alignment = dalign; 1596 } 1597 } 1598 1599 raw_refresh_zoned_limits(bs, &st, errp); 1600 } 1601 1602 static int check_for_dasd(int fd) 1603 { 1604 #ifdef BIODASDINFO2 1605 struct dasd_information2_t info = {0}; 1606 1607 return ioctl(fd, BIODASDINFO2, &info); 1608 #else 1609 return -1; 1610 #endif 1611 } 1612 1613 /** 1614 * Try to get @bs's logical and physical block size. 1615 * On success, store them in @bsz and return zero. 1616 * On failure, return negative errno. 1617 */ 1618 static int hdev_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) 1619 { 1620 BDRVRawState *s = bs->opaque; 1621 int ret; 1622 1623 /* If DASD or zoned devices, get blocksizes */ 1624 if (check_for_dasd(s->fd) < 0) { 1625 /* zoned devices are not DASD */ 1626 if (bs->bl.zoned == BLK_Z_NONE) { 1627 return -ENOTSUP; 1628 } 1629 } 1630 ret = probe_logical_blocksize(s->fd, &bsz->log); 1631 if (ret < 0) { 1632 return ret; 1633 } 1634 return probe_physical_blocksize(s->fd, &bsz->phys); 1635 } 1636 1637 /** 1638 * Try to get @bs's geometry: cyls, heads, sectors. 1639 * On success, store them in @geo and return 0. 1640 * On failure return -errno. 1641 * (Allows block driver to assign default geometry values that guest sees) 1642 */ 1643 #ifdef __linux__ 1644 static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo) 1645 { 1646 BDRVRawState *s = bs->opaque; 1647 struct hd_geometry ioctl_geo = {0}; 1648 1649 /* If DASD, get its geometry */ 1650 if (check_for_dasd(s->fd) < 0) { 1651 return -ENOTSUP; 1652 } 1653 if (ioctl(s->fd, HDIO_GETGEO, &ioctl_geo) < 0) { 1654 return -errno; 1655 } 1656 /* HDIO_GETGEO may return success even though geo contains zeros 1657 (e.g. certain multipath setups) */ 1658 if (!ioctl_geo.heads || !ioctl_geo.sectors || !ioctl_geo.cylinders) { 1659 return -ENOTSUP; 1660 } 1661 /* Do not return a geometry for partition */ 1662 if (ioctl_geo.start != 0) { 1663 return -ENOTSUP; 1664 } 1665 geo->heads = ioctl_geo.heads; 1666 geo->sectors = ioctl_geo.sectors; 1667 geo->cylinders = ioctl_geo.cylinders; 1668 1669 return 0; 1670 } 1671 #else /* __linux__ */ 1672 static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo) 1673 { 1674 return -ENOTSUP; 1675 } 1676 #endif 1677 1678 #if defined(__linux__) 1679 static int handle_aiocb_ioctl(void *opaque) 1680 { 1681 RawPosixAIOData *aiocb = opaque; 1682 int ret; 1683 1684 ret = RETRY_ON_EINTR( 1685 ioctl(aiocb->aio_fildes, aiocb->ioctl.cmd, aiocb->ioctl.buf) 1686 ); 1687 if (ret == -1) { 1688 return -errno; 1689 } 1690 1691 return 0; 1692 } 1693 #endif /* linux */ 1694 1695 static int handle_aiocb_flush(void *opaque) 1696 { 1697 RawPosixAIOData *aiocb = opaque; 1698 BDRVRawState *s = aiocb->bs->opaque; 1699 int ret; 1700 1701 if (s->page_cache_inconsistent) { 1702 return -s->page_cache_inconsistent; 1703 } 1704 1705 ret = qemu_fdatasync(aiocb->aio_fildes); 1706 if (ret == -1) { 1707 trace_file_flush_fdatasync_failed(errno); 1708 1709 /* There is no clear definition of the semantics of a failing fsync(), 1710 * so we may have to assume the worst. The sad truth is that this 1711 * assumption is correct for Linux. Some pages are now probably marked 1712 * clean in the page cache even though they are inconsistent with the 1713 * on-disk contents. The next fdatasync() call would succeed, but no 1714 * further writeback attempt will be made. We can't get back to a state 1715 * in which we know what is on disk (we would have to rewrite 1716 * everything that was touched since the last fdatasync() at least), so 1717 * make bdrv_flush() fail permanently. Given that the behaviour isn't 1718 * really defined, I have little hope that other OSes are doing better. 1719 * 1720 * Obviously, this doesn't affect O_DIRECT, which bypasses the page 1721 * cache. */ 1722 if ((s->open_flags & O_DIRECT) == 0) { 1723 s->page_cache_inconsistent = errno; 1724 } 1725 return -errno; 1726 } 1727 return 0; 1728 } 1729 1730 #ifdef CONFIG_PREADV 1731 1732 static bool preadv_present = true; 1733 1734 static ssize_t 1735 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1736 { 1737 return preadv(fd, iov, nr_iov, offset); 1738 } 1739 1740 static ssize_t 1741 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1742 { 1743 return pwritev(fd, iov, nr_iov, offset); 1744 } 1745 1746 #else 1747 1748 static bool preadv_present = false; 1749 1750 static ssize_t 1751 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1752 { 1753 return -ENOSYS; 1754 } 1755 1756 static ssize_t 1757 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1758 { 1759 return -ENOSYS; 1760 } 1761 1762 #endif 1763 1764 static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb) 1765 { 1766 ssize_t len; 1767 1768 len = RETRY_ON_EINTR( 1769 (aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) ? 1770 qemu_pwritev(aiocb->aio_fildes, 1771 aiocb->io.iov, 1772 aiocb->io.niov, 1773 aiocb->aio_offset) : 1774 qemu_preadv(aiocb->aio_fildes, 1775 aiocb->io.iov, 1776 aiocb->io.niov, 1777 aiocb->aio_offset) 1778 ); 1779 1780 if (len == -1) { 1781 return -errno; 1782 } 1783 return len; 1784 } 1785 1786 /* 1787 * Read/writes the data to/from a given linear buffer. 1788 * 1789 * Returns the number of bytes handles or -errno in case of an error. Short 1790 * reads are only returned if the end of the file is reached. 1791 */ 1792 static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf) 1793 { 1794 ssize_t offset = 0; 1795 ssize_t len; 1796 1797 while (offset < aiocb->aio_nbytes) { 1798 if (aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) { 1799 len = pwrite(aiocb->aio_fildes, 1800 (const char *)buf + offset, 1801 aiocb->aio_nbytes - offset, 1802 aiocb->aio_offset + offset); 1803 } else { 1804 len = pread(aiocb->aio_fildes, 1805 buf + offset, 1806 aiocb->aio_nbytes - offset, 1807 aiocb->aio_offset + offset); 1808 } 1809 if (len == -1 && errno == EINTR) { 1810 continue; 1811 } else if (len == -1 && errno == EINVAL && 1812 (aiocb->bs->open_flags & BDRV_O_NOCACHE) && 1813 !(aiocb->aio_type & QEMU_AIO_WRITE) && 1814 offset > 0) { 1815 /* O_DIRECT pread() may fail with EINVAL when offset is unaligned 1816 * after a short read. Assume that O_DIRECT short reads only occur 1817 * at EOF. Therefore this is a short read, not an I/O error. 1818 */ 1819 break; 1820 } else if (len == -1) { 1821 offset = -errno; 1822 break; 1823 } else if (len == 0) { 1824 break; 1825 } 1826 offset += len; 1827 } 1828 1829 return offset; 1830 } 1831 1832 static int handle_aiocb_rw(void *opaque) 1833 { 1834 RawPosixAIOData *aiocb = opaque; 1835 ssize_t nbytes; 1836 char *buf; 1837 1838 if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) { 1839 /* 1840 * If there is just a single buffer, and it is properly aligned 1841 * we can just use plain pread/pwrite without any problems. 1842 */ 1843 if (aiocb->io.niov == 1) { 1844 nbytes = handle_aiocb_rw_linear(aiocb, aiocb->io.iov->iov_base); 1845 goto out; 1846 } 1847 /* 1848 * We have more than one iovec, and all are properly aligned. 1849 * 1850 * Try preadv/pwritev first and fall back to linearizing the 1851 * buffer if it's not supported. 1852 */ 1853 if (preadv_present) { 1854 nbytes = handle_aiocb_rw_vector(aiocb); 1855 if (nbytes == aiocb->aio_nbytes || 1856 (nbytes < 0 && nbytes != -ENOSYS)) { 1857 goto out; 1858 } 1859 preadv_present = false; 1860 } 1861 1862 /* 1863 * XXX(hch): short read/write. no easy way to handle the reminder 1864 * using these interfaces. For now retry using plain 1865 * pread/pwrite? 1866 */ 1867 } 1868 1869 /* 1870 * Ok, we have to do it the hard way, copy all segments into 1871 * a single aligned buffer. 1872 */ 1873 buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes); 1874 if (buf == NULL) { 1875 nbytes = -ENOMEM; 1876 goto out; 1877 } 1878 1879 if (aiocb->aio_type & QEMU_AIO_WRITE) { 1880 char *p = buf; 1881 int i; 1882 1883 for (i = 0; i < aiocb->io.niov; ++i) { 1884 memcpy(p, aiocb->io.iov[i].iov_base, aiocb->io.iov[i].iov_len); 1885 p += aiocb->io.iov[i].iov_len; 1886 } 1887 assert(p - buf == aiocb->aio_nbytes); 1888 } 1889 1890 nbytes = handle_aiocb_rw_linear(aiocb, buf); 1891 if (!(aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND))) { 1892 char *p = buf; 1893 size_t count = aiocb->aio_nbytes, copy; 1894 int i; 1895 1896 for (i = 0; i < aiocb->io.niov && count; ++i) { 1897 copy = count; 1898 if (copy > aiocb->io.iov[i].iov_len) { 1899 copy = aiocb->io.iov[i].iov_len; 1900 } 1901 memcpy(aiocb->io.iov[i].iov_base, p, copy); 1902 assert(count >= copy); 1903 p += copy; 1904 count -= copy; 1905 } 1906 assert(count == 0); 1907 } 1908 qemu_vfree(buf); 1909 1910 out: 1911 if (nbytes == aiocb->aio_nbytes) { 1912 return 0; 1913 } else if (nbytes >= 0 && nbytes < aiocb->aio_nbytes) { 1914 if (aiocb->aio_type & QEMU_AIO_WRITE) { 1915 return -EINVAL; 1916 } else { 1917 iov_memset(aiocb->io.iov, aiocb->io.niov, nbytes, 1918 0, aiocb->aio_nbytes - nbytes); 1919 return 0; 1920 } 1921 } else { 1922 assert(nbytes < 0); 1923 return nbytes; 1924 } 1925 } 1926 1927 #if defined(CONFIG_FALLOCATE) || defined(BLKZEROOUT) || defined(BLKDISCARD) 1928 static int translate_err(int err) 1929 { 1930 if (err == -ENODEV || err == -ENOSYS || err == -EOPNOTSUPP || 1931 err == -ENOTTY) { 1932 err = -ENOTSUP; 1933 } 1934 return err; 1935 } 1936 #endif 1937 1938 #ifdef CONFIG_FALLOCATE 1939 static int do_fallocate(int fd, int mode, off_t offset, off_t len) 1940 { 1941 do { 1942 if (fallocate(fd, mode, offset, len) == 0) { 1943 return 0; 1944 } 1945 } while (errno == EINTR); 1946 return translate_err(-errno); 1947 } 1948 #endif 1949 1950 static ssize_t handle_aiocb_write_zeroes_block(RawPosixAIOData *aiocb) 1951 { 1952 int ret = -ENOTSUP; 1953 BDRVRawState *s = aiocb->bs->opaque; 1954 1955 if (!s->has_write_zeroes) { 1956 return -ENOTSUP; 1957 } 1958 1959 #ifdef BLKZEROOUT 1960 /* The BLKZEROOUT implementation in the kernel doesn't set 1961 * BLKDEV_ZERO_NOFALLBACK, so we can't call this if we have to avoid slow 1962 * fallbacks. */ 1963 if (!(aiocb->aio_type & QEMU_AIO_NO_FALLBACK)) { 1964 do { 1965 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes }; 1966 if (ioctl(aiocb->aio_fildes, BLKZEROOUT, range) == 0) { 1967 return 0; 1968 } 1969 } while (errno == EINTR); 1970 1971 ret = translate_err(-errno); 1972 if (ret == -ENOTSUP) { 1973 s->has_write_zeroes = false; 1974 } 1975 } 1976 #endif 1977 1978 return ret; 1979 } 1980 1981 static int handle_aiocb_write_zeroes(void *opaque) 1982 { 1983 RawPosixAIOData *aiocb = opaque; 1984 #ifdef CONFIG_FALLOCATE 1985 BDRVRawState *s = aiocb->bs->opaque; 1986 int64_t len; 1987 #endif 1988 1989 if (aiocb->aio_type & QEMU_AIO_BLKDEV) { 1990 return handle_aiocb_write_zeroes_block(aiocb); 1991 } 1992 1993 #ifdef CONFIG_FALLOCATE_ZERO_RANGE 1994 if (s->has_write_zeroes) { 1995 int ret = do_fallocate(s->fd, FALLOC_FL_ZERO_RANGE, 1996 aiocb->aio_offset, aiocb->aio_nbytes); 1997 if (ret == -ENOTSUP) { 1998 s->has_write_zeroes = false; 1999 } else if (ret == 0 || ret != -EINVAL) { 2000 return ret; 2001 } 2002 /* 2003 * Note: Some file systems do not like unaligned byte ranges, and 2004 * return EINVAL in such a case, though they should not do it according 2005 * to the man-page of fallocate(). Thus we simply ignore this return 2006 * value and try the other fallbacks instead. 2007 */ 2008 } 2009 #endif 2010 2011 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE 2012 if (s->has_discard && s->has_fallocate) { 2013 int ret = do_fallocate(s->fd, 2014 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 2015 aiocb->aio_offset, aiocb->aio_nbytes); 2016 if (ret == 0) { 2017 ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes); 2018 if (ret == 0 || ret != -ENOTSUP) { 2019 return ret; 2020 } 2021 s->has_fallocate = false; 2022 } else if (ret == -EINVAL) { 2023 /* 2024 * Some file systems like older versions of GPFS do not like un- 2025 * aligned byte ranges, and return EINVAL in such a case, though 2026 * they should not do it according to the man-page of fallocate(). 2027 * Warn about the bad filesystem and try the final fallback instead. 2028 */ 2029 warn_report_once("Your file system is misbehaving: " 2030 "fallocate(FALLOC_FL_PUNCH_HOLE) returned EINVAL. " 2031 "Please report this bug to your file system " 2032 "vendor."); 2033 } else if (ret != -ENOTSUP) { 2034 return ret; 2035 } else { 2036 s->has_discard = false; 2037 } 2038 } 2039 #endif 2040 2041 #ifdef CONFIG_FALLOCATE 2042 /* Last resort: we are trying to extend the file with zeroed data. This 2043 * can be done via fallocate(fd, 0) */ 2044 len = raw_getlength(aiocb->bs); 2045 if (s->has_fallocate && len >= 0 && aiocb->aio_offset >= len) { 2046 int ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes); 2047 if (ret == 0 || ret != -ENOTSUP) { 2048 return ret; 2049 } 2050 s->has_fallocate = false; 2051 } 2052 #endif 2053 2054 return -ENOTSUP; 2055 } 2056 2057 static int handle_aiocb_write_zeroes_unmap(void *opaque) 2058 { 2059 RawPosixAIOData *aiocb = opaque; 2060 BDRVRawState *s G_GNUC_UNUSED = aiocb->bs->opaque; 2061 2062 /* First try to write zeros and unmap at the same time */ 2063 2064 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE 2065 int ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 2066 aiocb->aio_offset, aiocb->aio_nbytes); 2067 switch (ret) { 2068 case -ENOTSUP: 2069 case -EINVAL: 2070 case -EBUSY: 2071 break; 2072 default: 2073 return ret; 2074 } 2075 #endif 2076 2077 /* If we couldn't manage to unmap while guaranteed that the area reads as 2078 * all-zero afterwards, just write zeroes without unmapping */ 2079 return handle_aiocb_write_zeroes(aiocb); 2080 } 2081 2082 #ifndef HAVE_COPY_FILE_RANGE 2083 #ifndef EMSCRIPTEN 2084 static 2085 #endif 2086 ssize_t copy_file_range(int in_fd, off_t *in_off, int out_fd, 2087 off_t *out_off, size_t len, unsigned int flags) 2088 { 2089 #ifdef __NR_copy_file_range 2090 return syscall(__NR_copy_file_range, in_fd, in_off, out_fd, 2091 out_off, len, flags); 2092 #else 2093 errno = ENOSYS; 2094 return -1; 2095 #endif 2096 } 2097 #endif 2098 2099 /* 2100 * parse_zone - Fill a zone descriptor 2101 */ 2102 #if defined(CONFIG_BLKZONED) 2103 static inline int parse_zone(struct BlockZoneDescriptor *zone, 2104 const struct blk_zone *blkz) { 2105 zone->start = blkz->start << BDRV_SECTOR_BITS; 2106 zone->length = blkz->len << BDRV_SECTOR_BITS; 2107 zone->wp = blkz->wp << BDRV_SECTOR_BITS; 2108 2109 #ifdef HAVE_BLK_ZONE_REP_CAPACITY 2110 zone->cap = blkz->capacity << BDRV_SECTOR_BITS; 2111 #else 2112 zone->cap = blkz->len << BDRV_SECTOR_BITS; 2113 #endif 2114 2115 switch (blkz->type) { 2116 case BLK_ZONE_TYPE_SEQWRITE_REQ: 2117 zone->type = BLK_ZT_SWR; 2118 break; 2119 case BLK_ZONE_TYPE_SEQWRITE_PREF: 2120 zone->type = BLK_ZT_SWP; 2121 break; 2122 case BLK_ZONE_TYPE_CONVENTIONAL: 2123 zone->type = BLK_ZT_CONV; 2124 break; 2125 default: 2126 error_report("Unsupported zone type: 0x%x", blkz->type); 2127 return -ENOTSUP; 2128 } 2129 2130 switch (blkz->cond) { 2131 case BLK_ZONE_COND_NOT_WP: 2132 zone->state = BLK_ZS_NOT_WP; 2133 break; 2134 case BLK_ZONE_COND_EMPTY: 2135 zone->state = BLK_ZS_EMPTY; 2136 break; 2137 case BLK_ZONE_COND_IMP_OPEN: 2138 zone->state = BLK_ZS_IOPEN; 2139 break; 2140 case BLK_ZONE_COND_EXP_OPEN: 2141 zone->state = BLK_ZS_EOPEN; 2142 break; 2143 case BLK_ZONE_COND_CLOSED: 2144 zone->state = BLK_ZS_CLOSED; 2145 break; 2146 case BLK_ZONE_COND_READONLY: 2147 zone->state = BLK_ZS_RDONLY; 2148 break; 2149 case BLK_ZONE_COND_FULL: 2150 zone->state = BLK_ZS_FULL; 2151 break; 2152 case BLK_ZONE_COND_OFFLINE: 2153 zone->state = BLK_ZS_OFFLINE; 2154 break; 2155 default: 2156 error_report("Unsupported zone state: 0x%x", blkz->cond); 2157 return -ENOTSUP; 2158 } 2159 return 0; 2160 } 2161 #endif 2162 2163 #if defined(CONFIG_BLKZONED) 2164 static int handle_aiocb_zone_report(void *opaque) 2165 { 2166 RawPosixAIOData *aiocb = opaque; 2167 int fd = aiocb->aio_fildes; 2168 unsigned int *nr_zones = aiocb->zone_report.nr_zones; 2169 BlockZoneDescriptor *zones = aiocb->zone_report.zones; 2170 /* zoned block devices use 512-byte sectors */ 2171 uint64_t sector = aiocb->aio_offset / 512; 2172 2173 struct blk_zone *blkz; 2174 size_t rep_size; 2175 unsigned int nrz; 2176 int ret; 2177 unsigned int n = 0, i = 0; 2178 2179 nrz = *nr_zones; 2180 rep_size = sizeof(struct blk_zone_report) + nrz * sizeof(struct blk_zone); 2181 g_autofree struct blk_zone_report *rep = NULL; 2182 rep = g_malloc(rep_size); 2183 2184 blkz = (struct blk_zone *)(rep + 1); 2185 while (n < nrz) { 2186 memset(rep, 0, rep_size); 2187 rep->sector = sector; 2188 rep->nr_zones = nrz - n; 2189 2190 do { 2191 ret = ioctl(fd, BLKREPORTZONE, rep); 2192 } while (ret != 0 && errno == EINTR); 2193 if (ret != 0) { 2194 error_report("%d: ioctl BLKREPORTZONE at %" PRId64 " failed %d", 2195 fd, sector, errno); 2196 return -errno; 2197 } 2198 2199 if (!rep->nr_zones) { 2200 break; 2201 } 2202 2203 for (i = 0; i < rep->nr_zones; i++, n++) { 2204 ret = parse_zone(&zones[n], &blkz[i]); 2205 if (ret != 0) { 2206 return ret; 2207 } 2208 2209 /* The next report should start after the last zone reported */ 2210 sector = blkz[i].start + blkz[i].len; 2211 } 2212 } 2213 2214 *nr_zones = n; 2215 return 0; 2216 } 2217 #endif 2218 2219 #if defined(CONFIG_BLKZONED) 2220 static int handle_aiocb_zone_mgmt(void *opaque) 2221 { 2222 RawPosixAIOData *aiocb = opaque; 2223 int fd = aiocb->aio_fildes; 2224 uint64_t sector = aiocb->aio_offset / 512; 2225 int64_t nr_sectors = aiocb->aio_nbytes / 512; 2226 struct blk_zone_range range; 2227 int ret; 2228 2229 /* Execute the operation */ 2230 range.sector = sector; 2231 range.nr_sectors = nr_sectors; 2232 do { 2233 ret = ioctl(fd, aiocb->zone_mgmt.op, &range); 2234 } while (ret != 0 && errno == EINTR); 2235 2236 return ret < 0 ? -errno : ret; 2237 } 2238 #endif 2239 2240 static int handle_aiocb_copy_range(void *opaque) 2241 { 2242 RawPosixAIOData *aiocb = opaque; 2243 uint64_t bytes = aiocb->aio_nbytes; 2244 off_t in_off = aiocb->aio_offset; 2245 off_t out_off = aiocb->copy_range.aio_offset2; 2246 2247 while (bytes) { 2248 ssize_t ret = copy_file_range(aiocb->aio_fildes, &in_off, 2249 aiocb->copy_range.aio_fd2, &out_off, 2250 bytes, 0); 2251 trace_file_copy_file_range(aiocb->bs, aiocb->aio_fildes, in_off, 2252 aiocb->copy_range.aio_fd2, out_off, bytes, 2253 0, ret); 2254 if (ret == 0) { 2255 /* No progress (e.g. when beyond EOF), let the caller fall back to 2256 * buffer I/O. */ 2257 return -ENOSPC; 2258 } 2259 if (ret < 0) { 2260 switch (errno) { 2261 case ENOSYS: 2262 return -ENOTSUP; 2263 case EINTR: 2264 continue; 2265 default: 2266 return -errno; 2267 } 2268 } 2269 bytes -= ret; 2270 } 2271 return 0; 2272 } 2273 2274 static int handle_aiocb_discard(void *opaque) 2275 { 2276 RawPosixAIOData *aiocb = opaque; 2277 int ret = -ENOTSUP; 2278 BDRVRawState *s = aiocb->bs->opaque; 2279 2280 if (!s->has_discard) { 2281 return -ENOTSUP; 2282 } 2283 2284 if (aiocb->aio_type & QEMU_AIO_BLKDEV) { 2285 #ifdef BLKDISCARD 2286 do { 2287 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes }; 2288 if (ioctl(aiocb->aio_fildes, BLKDISCARD, range) == 0) { 2289 return 0; 2290 } 2291 } while (errno == EINTR); 2292 2293 ret = translate_err(-errno); 2294 #endif 2295 } else { 2296 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE 2297 ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 2298 aiocb->aio_offset, aiocb->aio_nbytes); 2299 ret = translate_err(ret); 2300 #elif defined(__APPLE__) && (__MACH__) 2301 fpunchhole_t fpunchhole; 2302 fpunchhole.fp_flags = 0; 2303 fpunchhole.reserved = 0; 2304 fpunchhole.fp_offset = aiocb->aio_offset; 2305 fpunchhole.fp_length = aiocb->aio_nbytes; 2306 if (fcntl(s->fd, F_PUNCHHOLE, &fpunchhole) == -1) { 2307 ret = errno == ENODEV ? -ENOTSUP : -errno; 2308 } else { 2309 ret = 0; 2310 } 2311 #endif 2312 } 2313 2314 if (ret == -ENOTSUP) { 2315 s->has_discard = false; 2316 } 2317 return ret; 2318 } 2319 2320 /* 2321 * Help alignment probing by allocating the first block. 2322 * 2323 * When reading with direct I/O from unallocated area on Gluster backed by XFS, 2324 * reading succeeds regardless of request length. In this case we fallback to 2325 * safe alignment which is not optimal. Allocating the first block avoids this 2326 * fallback. 2327 * 2328 * fd may be opened with O_DIRECT, but we don't know the buffer alignment or 2329 * request alignment, so we use safe values. 2330 * 2331 * Returns: 0 on success, -errno on failure. Since this is an optimization, 2332 * caller may ignore failures. 2333 */ 2334 static int allocate_first_block(int fd, size_t max_size) 2335 { 2336 size_t write_size = (max_size < MAX_BLOCKSIZE) 2337 ? BDRV_SECTOR_SIZE 2338 : MAX_BLOCKSIZE; 2339 size_t max_align = MAX(MAX_BLOCKSIZE, qemu_real_host_page_size()); 2340 void *buf; 2341 ssize_t n; 2342 int ret; 2343 2344 buf = qemu_memalign(max_align, write_size); 2345 memset(buf, 0, write_size); 2346 2347 n = RETRY_ON_EINTR(pwrite(fd, buf, write_size, 0)); 2348 2349 ret = (n == -1) ? -errno : 0; 2350 2351 qemu_vfree(buf); 2352 return ret; 2353 } 2354 2355 static int handle_aiocb_truncate(void *opaque) 2356 { 2357 RawPosixAIOData *aiocb = opaque; 2358 int result = 0; 2359 int64_t current_length = 0; 2360 char *buf = NULL; 2361 struct stat st; 2362 int fd = aiocb->aio_fildes; 2363 int64_t offset = aiocb->aio_offset; 2364 PreallocMode prealloc = aiocb->truncate.prealloc; 2365 Error **errp = aiocb->truncate.errp; 2366 2367 if (fstat(fd, &st) < 0) { 2368 result = -errno; 2369 error_setg_errno(errp, -result, "Could not stat file"); 2370 return result; 2371 } 2372 2373 current_length = st.st_size; 2374 if (current_length > offset && prealloc != PREALLOC_MODE_OFF) { 2375 error_setg(errp, "Cannot use preallocation for shrinking files"); 2376 return -ENOTSUP; 2377 } 2378 2379 switch (prealloc) { 2380 #ifdef CONFIG_POSIX_FALLOCATE 2381 case PREALLOC_MODE_FALLOC: 2382 /* 2383 * Truncating before posix_fallocate() makes it about twice slower on 2384 * file systems that do not support fallocate(), trying to check if a 2385 * block is allocated before allocating it, so don't do that here. 2386 */ 2387 if (offset != current_length) { 2388 result = -posix_fallocate(fd, current_length, 2389 offset - current_length); 2390 if (result != 0) { 2391 /* posix_fallocate() doesn't set errno. */ 2392 error_setg_errno(errp, -result, 2393 "Could not preallocate new data"); 2394 } else if (current_length == 0) { 2395 /* 2396 * posix_fallocate() uses fallocate() if the filesystem 2397 * supports it, or fallback to manually writing zeroes. If 2398 * fallocate() was used, unaligned reads from the fallocated 2399 * area in raw_probe_alignment() will succeed, hence we need to 2400 * allocate the first block. 2401 * 2402 * Optimize future alignment probing; ignore failures. 2403 */ 2404 allocate_first_block(fd, offset); 2405 } 2406 } else { 2407 result = 0; 2408 } 2409 goto out; 2410 #endif 2411 case PREALLOC_MODE_FULL: 2412 { 2413 int64_t num = 0, left = offset - current_length; 2414 off_t seek_result; 2415 2416 /* 2417 * Knowing the final size from the beginning could allow the file 2418 * system driver to do less allocations and possibly avoid 2419 * fragmentation of the file. 2420 */ 2421 if (ftruncate(fd, offset) != 0) { 2422 result = -errno; 2423 error_setg_errno(errp, -result, "Could not resize file"); 2424 goto out; 2425 } 2426 2427 buf = g_malloc0(65536); 2428 2429 seek_result = lseek(fd, current_length, SEEK_SET); 2430 if (seek_result < 0) { 2431 result = -errno; 2432 error_setg_errno(errp, -result, 2433 "Failed to seek to the old end of file"); 2434 goto out; 2435 } 2436 2437 while (left > 0) { 2438 num = MIN(left, 65536); 2439 result = write(fd, buf, num); 2440 if (result < 0) { 2441 if (errno == EINTR) { 2442 continue; 2443 } 2444 result = -errno; 2445 error_setg_errno(errp, -result, 2446 "Could not write zeros for preallocation"); 2447 goto out; 2448 } 2449 left -= result; 2450 } 2451 if (result >= 0) { 2452 result = fsync(fd); 2453 if (result < 0) { 2454 result = -errno; 2455 error_setg_errno(errp, -result, 2456 "Could not flush file to disk"); 2457 goto out; 2458 } 2459 } 2460 goto out; 2461 } 2462 case PREALLOC_MODE_OFF: 2463 if (ftruncate(fd, offset) != 0) { 2464 result = -errno; 2465 error_setg_errno(errp, -result, "Could not resize file"); 2466 } else if (current_length == 0 && offset > current_length) { 2467 /* Optimize future alignment probing; ignore failures. */ 2468 allocate_first_block(fd, offset); 2469 } 2470 return result; 2471 default: 2472 result = -ENOTSUP; 2473 error_setg(errp, "Unsupported preallocation mode: %s", 2474 PreallocMode_str(prealloc)); 2475 return result; 2476 } 2477 2478 out: 2479 if (result < 0) { 2480 if (ftruncate(fd, current_length) < 0) { 2481 error_report("Failed to restore old file length: %s", 2482 strerror(errno)); 2483 } 2484 } 2485 2486 g_free(buf); 2487 return result; 2488 } 2489 2490 static int coroutine_fn raw_thread_pool_submit(ThreadPoolFunc func, void *arg) 2491 { 2492 return thread_pool_submit_co(func, arg); 2493 } 2494 2495 /* 2496 * Check if all memory in this vector is sector aligned. 2497 */ 2498 static bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) 2499 { 2500 int i; 2501 size_t alignment = bdrv_min_mem_align(bs); 2502 size_t len = bs->bl.request_alignment; 2503 IO_CODE(); 2504 2505 for (i = 0; i < qiov->niov; i++) { 2506 if ((uintptr_t) qiov->iov[i].iov_base % alignment) { 2507 return false; 2508 } 2509 if (qiov->iov[i].iov_len % len) { 2510 return false; 2511 } 2512 } 2513 2514 return true; 2515 } 2516 2517 #ifdef CONFIG_LINUX_IO_URING 2518 static inline bool raw_check_linux_io_uring(BDRVRawState *s) 2519 { 2520 Error *local_err = NULL; 2521 AioContext *ctx; 2522 2523 if (!s->use_linux_io_uring) { 2524 return false; 2525 } 2526 2527 ctx = qemu_get_current_aio_context(); 2528 if (unlikely(!aio_setup_linux_io_uring(ctx, &local_err))) { 2529 error_reportf_err(local_err, "Unable to use linux io_uring, " 2530 "falling back to thread pool: "); 2531 s->use_linux_io_uring = false; 2532 return false; 2533 } 2534 return true; 2535 } 2536 #endif 2537 2538 #ifdef CONFIG_LINUX_AIO 2539 static inline bool raw_check_linux_aio(BDRVRawState *s) 2540 { 2541 Error *local_err = NULL; 2542 AioContext *ctx; 2543 2544 if (!s->use_linux_aio) { 2545 return false; 2546 } 2547 2548 ctx = qemu_get_current_aio_context(); 2549 if (unlikely(!aio_setup_linux_aio(ctx, &local_err))) { 2550 error_reportf_err(local_err, "Unable to use Linux AIO, " 2551 "falling back to thread pool: "); 2552 s->use_linux_aio = false; 2553 return false; 2554 } 2555 return true; 2556 } 2557 #endif 2558 2559 static int coroutine_fn raw_co_prw(BlockDriverState *bs, int64_t *offset_ptr, 2560 uint64_t bytes, QEMUIOVector *qiov, int type, 2561 int flags) 2562 { 2563 BDRVRawState *s = bs->opaque; 2564 RawPosixAIOData acb; 2565 int ret; 2566 uint64_t offset = *offset_ptr; 2567 2568 if (fd_open(bs) < 0) 2569 return -EIO; 2570 #if defined(CONFIG_BLKZONED) 2571 if ((type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) && 2572 bs->bl.zoned != BLK_Z_NONE) { 2573 qemu_co_mutex_lock(&bs->wps->colock); 2574 if (type & QEMU_AIO_ZONE_APPEND) { 2575 int index = offset / bs->bl.zone_size; 2576 offset = bs->wps->wp[index]; 2577 } 2578 } 2579 #endif 2580 2581 /* 2582 * When using O_DIRECT, the request must be aligned to be able to use 2583 * either libaio or io_uring interface. If not fail back to regular thread 2584 * pool read/write code which emulates this for us if we 2585 * set QEMU_AIO_MISALIGNED. 2586 */ 2587 if (s->needs_alignment && !bdrv_qiov_is_aligned(bs, qiov)) { 2588 type |= QEMU_AIO_MISALIGNED; 2589 #ifdef CONFIG_LINUX_IO_URING 2590 } else if (raw_check_linux_io_uring(s)) { 2591 assert(qiov->size == bytes); 2592 ret = luring_co_submit(bs, s->fd, offset, qiov, type, flags); 2593 goto out; 2594 #endif 2595 #ifdef CONFIG_LINUX_AIO 2596 } else if (raw_check_linux_aio(s)) { 2597 assert(qiov->size == bytes); 2598 ret = laio_co_submit(s->fd, offset, qiov, type, flags, 2599 s->aio_max_batch); 2600 goto out; 2601 #endif 2602 } 2603 2604 acb = (RawPosixAIOData) { 2605 .bs = bs, 2606 .aio_fildes = s->fd, 2607 .aio_type = type, 2608 .aio_offset = offset, 2609 .aio_nbytes = bytes, 2610 .io = { 2611 .iov = qiov->iov, 2612 .niov = qiov->niov, 2613 }, 2614 }; 2615 2616 assert(qiov->size == bytes); 2617 ret = raw_thread_pool_submit(handle_aiocb_rw, &acb); 2618 if (ret == 0 && (flags & BDRV_REQ_FUA)) { 2619 /* TODO Use pwritev2() instead if it's available */ 2620 ret = raw_co_flush_to_disk(bs); 2621 } 2622 goto out; /* Avoid the compiler err of unused label */ 2623 2624 out: 2625 #if defined(CONFIG_BLKZONED) 2626 if ((type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) && 2627 bs->bl.zoned != BLK_Z_NONE) { 2628 BlockZoneWps *wps = bs->wps; 2629 if (ret == 0) { 2630 uint64_t *wp = &wps->wp[offset / bs->bl.zone_size]; 2631 if (!BDRV_ZT_IS_CONV(*wp)) { 2632 if (type & QEMU_AIO_ZONE_APPEND) { 2633 *offset_ptr = *wp; 2634 trace_zbd_zone_append_complete(bs, *offset_ptr 2635 >> BDRV_SECTOR_BITS); 2636 } 2637 /* Advance the wp if needed */ 2638 if (offset + bytes > *wp) { 2639 *wp = offset + bytes; 2640 } 2641 } 2642 } else { 2643 /* 2644 * write and append write are not allowed to cross zone boundaries 2645 */ 2646 update_zones_wp(bs, s->fd, offset, 1); 2647 } 2648 2649 qemu_co_mutex_unlock(&wps->colock); 2650 } 2651 #endif 2652 return ret; 2653 } 2654 2655 static int coroutine_fn raw_co_preadv(BlockDriverState *bs, int64_t offset, 2656 int64_t bytes, QEMUIOVector *qiov, 2657 BdrvRequestFlags flags) 2658 { 2659 return raw_co_prw(bs, &offset, bytes, qiov, QEMU_AIO_READ, flags); 2660 } 2661 2662 static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, int64_t offset, 2663 int64_t bytes, QEMUIOVector *qiov, 2664 BdrvRequestFlags flags) 2665 { 2666 return raw_co_prw(bs, &offset, bytes, qiov, QEMU_AIO_WRITE, flags); 2667 } 2668 2669 static int coroutine_fn raw_co_flush_to_disk(BlockDriverState *bs) 2670 { 2671 BDRVRawState *s = bs->opaque; 2672 RawPosixAIOData acb; 2673 int ret; 2674 2675 ret = fd_open(bs); 2676 if (ret < 0) { 2677 return ret; 2678 } 2679 2680 acb = (RawPosixAIOData) { 2681 .bs = bs, 2682 .aio_fildes = s->fd, 2683 .aio_type = QEMU_AIO_FLUSH, 2684 }; 2685 2686 #ifdef CONFIG_LINUX_IO_URING 2687 if (raw_check_linux_io_uring(s)) { 2688 return luring_co_submit(bs, s->fd, 0, NULL, QEMU_AIO_FLUSH, 0); 2689 } 2690 #endif 2691 #ifdef CONFIG_LINUX_AIO 2692 if (s->has_laio_fdsync && raw_check_linux_aio(s)) { 2693 return laio_co_submit(s->fd, 0, NULL, QEMU_AIO_FLUSH, 0, 0); 2694 } 2695 #endif 2696 return raw_thread_pool_submit(handle_aiocb_flush, &acb); 2697 } 2698 2699 static void raw_close(BlockDriverState *bs) 2700 { 2701 BDRVRawState *s = bs->opaque; 2702 2703 if (s->fd >= 0) { 2704 #if defined(CONFIG_BLKZONED) 2705 g_free(bs->wps); 2706 #endif 2707 qemu_close(s->fd); 2708 s->fd = -1; 2709 } 2710 } 2711 2712 /** 2713 * Truncates the given regular file @fd to @offset and, when growing, fills the 2714 * new space according to @prealloc. 2715 * 2716 * Returns: 0 on success, -errno on failure. 2717 */ 2718 static int coroutine_fn 2719 raw_regular_truncate(BlockDriverState *bs, int fd, int64_t offset, 2720 PreallocMode prealloc, Error **errp) 2721 { 2722 RawPosixAIOData acb; 2723 2724 acb = (RawPosixAIOData) { 2725 .bs = bs, 2726 .aio_fildes = fd, 2727 .aio_type = QEMU_AIO_TRUNCATE, 2728 .aio_offset = offset, 2729 .truncate = { 2730 .prealloc = prealloc, 2731 .errp = errp, 2732 }, 2733 }; 2734 2735 return raw_thread_pool_submit(handle_aiocb_truncate, &acb); 2736 } 2737 2738 static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset, 2739 bool exact, PreallocMode prealloc, 2740 BdrvRequestFlags flags, Error **errp) 2741 { 2742 BDRVRawState *s = bs->opaque; 2743 struct stat st; 2744 int ret; 2745 2746 if (fstat(s->fd, &st)) { 2747 ret = -errno; 2748 error_setg_errno(errp, -ret, "Failed to fstat() the file"); 2749 return ret; 2750 } 2751 2752 if (S_ISREG(st.st_mode)) { 2753 /* Always resizes to the exact @offset */ 2754 return raw_regular_truncate(bs, s->fd, offset, prealloc, errp); 2755 } 2756 2757 if (prealloc != PREALLOC_MODE_OFF) { 2758 error_setg(errp, "Preallocation mode '%s' unsupported for this " 2759 "non-regular file", PreallocMode_str(prealloc)); 2760 return -ENOTSUP; 2761 } 2762 2763 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { 2764 int64_t cur_length = raw_getlength(bs); 2765 2766 if (offset != cur_length && exact) { 2767 error_setg(errp, "Cannot resize device files"); 2768 return -ENOTSUP; 2769 } else if (offset > cur_length) { 2770 error_setg(errp, "Cannot grow device files"); 2771 return -EINVAL; 2772 } 2773 } else { 2774 error_setg(errp, "Resizing this file is not supported"); 2775 return -ENOTSUP; 2776 } 2777 2778 return 0; 2779 } 2780 2781 #ifdef __OpenBSD__ 2782 static int64_t raw_getlength(BlockDriverState *bs) 2783 { 2784 BDRVRawState *s = bs->opaque; 2785 int fd = s->fd; 2786 struct stat st; 2787 2788 if (fstat(fd, &st)) 2789 return -errno; 2790 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { 2791 struct disklabel dl; 2792 2793 if (ioctl(fd, DIOCGDINFO, &dl)) 2794 return -errno; 2795 return (uint64_t)dl.d_secsize * 2796 dl.d_partitions[DISKPART(st.st_rdev)].p_size; 2797 } else 2798 return st.st_size; 2799 } 2800 #elif defined(__NetBSD__) 2801 static int64_t raw_getlength(BlockDriverState *bs) 2802 { 2803 BDRVRawState *s = bs->opaque; 2804 int fd = s->fd; 2805 struct stat st; 2806 2807 if (fstat(fd, &st)) 2808 return -errno; 2809 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { 2810 struct dkwedge_info dkw; 2811 2812 if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) { 2813 return dkw.dkw_size * 512; 2814 } else { 2815 struct disklabel dl; 2816 2817 if (ioctl(fd, DIOCGDINFO, &dl)) 2818 return -errno; 2819 return (uint64_t)dl.d_secsize * 2820 dl.d_partitions[DISKPART(st.st_rdev)].p_size; 2821 } 2822 } else 2823 return st.st_size; 2824 } 2825 #elif defined(__sun__) 2826 static int64_t raw_getlength(BlockDriverState *bs) 2827 { 2828 BDRVRawState *s = bs->opaque; 2829 struct dk_minfo minfo; 2830 int ret; 2831 int64_t size; 2832 2833 ret = fd_open(bs); 2834 if (ret < 0) { 2835 return ret; 2836 } 2837 2838 /* 2839 * Use the DKIOCGMEDIAINFO ioctl to read the size. 2840 */ 2841 ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo); 2842 if (ret != -1) { 2843 return minfo.dki_lbsize * minfo.dki_capacity; 2844 } 2845 2846 /* 2847 * There are reports that lseek on some devices fails, but 2848 * irc discussion said that contingency on contingency was overkill. 2849 */ 2850 size = lseek(s->fd, 0, SEEK_END); 2851 if (size < 0) { 2852 return -errno; 2853 } 2854 return size; 2855 } 2856 #elif defined(CONFIG_BSD) 2857 static int64_t raw_getlength(BlockDriverState *bs) 2858 { 2859 BDRVRawState *s = bs->opaque; 2860 int fd = s->fd; 2861 int64_t size; 2862 struct stat sb; 2863 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) 2864 int reopened = 0; 2865 #endif 2866 int ret; 2867 2868 ret = fd_open(bs); 2869 if (ret < 0) 2870 return ret; 2871 2872 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) 2873 again: 2874 #endif 2875 if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) { 2876 size = 0; 2877 #ifdef DIOCGMEDIASIZE 2878 if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size)) { 2879 size = 0; 2880 } 2881 #endif 2882 #ifdef DIOCGPART 2883 if (size == 0) { 2884 struct partinfo pi; 2885 if (ioctl(fd, DIOCGPART, &pi) == 0) { 2886 size = pi.media_size; 2887 } 2888 } 2889 #endif 2890 #if defined(DKIOCGETBLOCKCOUNT) && defined(DKIOCGETBLOCKSIZE) 2891 if (size == 0) { 2892 uint64_t sectors = 0; 2893 uint32_t sector_size = 0; 2894 2895 if (ioctl(fd, DKIOCGETBLOCKCOUNT, §ors) == 0 2896 && ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) == 0) { 2897 size = sectors * sector_size; 2898 } 2899 } 2900 #endif 2901 if (size == 0) { 2902 size = lseek(fd, 0LL, SEEK_END); 2903 } 2904 if (size < 0) { 2905 return -errno; 2906 } 2907 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 2908 switch(s->type) { 2909 case FTYPE_CD: 2910 /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */ 2911 if (size == 2048LL * (unsigned)-1) 2912 size = 0; 2913 /* XXX no disc? maybe we need to reopen... */ 2914 if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) { 2915 reopened = 1; 2916 goto again; 2917 } 2918 } 2919 #endif 2920 } else { 2921 size = lseek(fd, 0, SEEK_END); 2922 if (size < 0) { 2923 return -errno; 2924 } 2925 } 2926 return size; 2927 } 2928 #else 2929 static int64_t raw_getlength(BlockDriverState *bs) 2930 { 2931 BDRVRawState *s = bs->opaque; 2932 int ret; 2933 int64_t size; 2934 2935 ret = fd_open(bs); 2936 if (ret < 0) { 2937 return ret; 2938 } 2939 2940 size = lseek(s->fd, 0, SEEK_END); 2941 if (size < 0) { 2942 return -errno; 2943 } 2944 return size; 2945 } 2946 #endif 2947 2948 static int64_t coroutine_fn raw_co_getlength(BlockDriverState *bs) 2949 { 2950 return raw_getlength(bs); 2951 } 2952 2953 static int64_t coroutine_fn raw_co_get_allocated_file_size(BlockDriverState *bs) 2954 { 2955 struct stat st; 2956 BDRVRawState *s = bs->opaque; 2957 2958 if (fstat(s->fd, &st) < 0) { 2959 return -errno; 2960 } 2961 return (int64_t)st.st_blocks * 512; 2962 } 2963 2964 static int coroutine_fn 2965 raw_co_create(BlockdevCreateOptions *options, Error **errp) 2966 { 2967 BlockdevCreateOptionsFile *file_opts; 2968 Error *local_err = NULL; 2969 int fd; 2970 uint64_t perm, shared; 2971 int result = 0; 2972 2973 /* Validate options and set default values */ 2974 assert(options->driver == BLOCKDEV_DRIVER_FILE); 2975 file_opts = &options->u.file; 2976 2977 if (!file_opts->has_nocow) { 2978 file_opts->nocow = false; 2979 } 2980 if (!file_opts->has_preallocation) { 2981 file_opts->preallocation = PREALLOC_MODE_OFF; 2982 } 2983 if (!file_opts->has_extent_size_hint) { 2984 file_opts->extent_size_hint = 1 * MiB; 2985 } 2986 if (file_opts->extent_size_hint > UINT32_MAX) { 2987 result = -EINVAL; 2988 error_setg(errp, "Extent size hint is too large"); 2989 goto out; 2990 } 2991 2992 /* Create file */ 2993 fd = qemu_create(file_opts->filename, O_RDWR | O_BINARY, 0644, errp); 2994 if (fd < 0) { 2995 result = -errno; 2996 goto out; 2997 } 2998 2999 /* Take permissions: We want to discard everything, so we need 3000 * BLK_PERM_WRITE; and truncation to the desired size requires 3001 * BLK_PERM_RESIZE. 3002 * On the other hand, we cannot share the RESIZE permission 3003 * because we promise that after this function, the file has the 3004 * size given in the options. If someone else were to resize it 3005 * concurrently, we could not guarantee that. 3006 * Note that after this function, we can no longer guarantee that 3007 * the file is not touched by a third party, so it may be resized 3008 * then. */ 3009 perm = BLK_PERM_WRITE | BLK_PERM_RESIZE; 3010 shared = BLK_PERM_ALL & ~BLK_PERM_RESIZE; 3011 3012 /* Step one: Take locks */ 3013 result = raw_apply_lock_bytes(NULL, fd, perm, ~shared, false, errp); 3014 if (result < 0) { 3015 goto out_close; 3016 } 3017 3018 /* Step two: Check that nobody else has taken conflicting locks */ 3019 result = raw_check_lock_bytes(fd, perm, shared, errp); 3020 if (result < 0) { 3021 error_append_hint(errp, 3022 "Is another process using the image [%s]?\n", 3023 file_opts->filename); 3024 goto out_unlock; 3025 } 3026 3027 /* Clear the file by truncating it to 0 */ 3028 result = raw_regular_truncate(NULL, fd, 0, PREALLOC_MODE_OFF, errp); 3029 if (result < 0) { 3030 goto out_unlock; 3031 } 3032 3033 if (file_opts->nocow) { 3034 #ifdef __linux__ 3035 /* Set NOCOW flag to solve performance issue on fs like btrfs. 3036 * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value 3037 * will be ignored since any failure of this operation should not 3038 * block the left work. 3039 */ 3040 int attr; 3041 if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) { 3042 attr |= FS_NOCOW_FL; 3043 ioctl(fd, FS_IOC_SETFLAGS, &attr); 3044 } 3045 #endif 3046 } 3047 #ifdef FS_IOC_FSSETXATTR 3048 /* 3049 * Try to set the extent size hint. Failure is not fatal, and a warning is 3050 * only printed if the option was explicitly specified. 3051 */ 3052 { 3053 struct fsxattr attr; 3054 result = ioctl(fd, FS_IOC_FSGETXATTR, &attr); 3055 if (result == 0) { 3056 attr.fsx_xflags |= FS_XFLAG_EXTSIZE; 3057 attr.fsx_extsize = file_opts->extent_size_hint; 3058 result = ioctl(fd, FS_IOC_FSSETXATTR, &attr); 3059 } 3060 if (result < 0 && file_opts->has_extent_size_hint && 3061 file_opts->extent_size_hint) 3062 { 3063 warn_report("Failed to set extent size hint: %s", 3064 strerror(errno)); 3065 } 3066 } 3067 #endif 3068 3069 /* Resize and potentially preallocate the file to the desired 3070 * final size */ 3071 result = raw_regular_truncate(NULL, fd, file_opts->size, 3072 file_opts->preallocation, errp); 3073 if (result < 0) { 3074 goto out_unlock; 3075 } 3076 3077 out_unlock: 3078 raw_apply_lock_bytes(NULL, fd, 0, 0, true, &local_err); 3079 if (local_err) { 3080 /* The above call should not fail, and if it does, that does 3081 * not mean the whole creation operation has failed. So 3082 * report it the user for their convenience, but do not report 3083 * it to the caller. */ 3084 warn_report_err(local_err); 3085 } 3086 3087 out_close: 3088 if (qemu_close(fd) != 0 && result == 0) { 3089 result = -errno; 3090 error_setg_errno(errp, -result, "Could not close the new file"); 3091 } 3092 out: 3093 return result; 3094 } 3095 3096 static int coroutine_fn GRAPH_RDLOCK 3097 raw_co_create_opts(BlockDriver *drv, const char *filename, 3098 QemuOpts *opts, Error **errp) 3099 { 3100 BlockdevCreateOptions options; 3101 int64_t total_size = 0; 3102 int64_t extent_size_hint = 0; 3103 bool has_extent_size_hint = false; 3104 bool nocow = false; 3105 PreallocMode prealloc; 3106 char *buf = NULL; 3107 Error *local_err = NULL; 3108 3109 /* Skip file: protocol prefix */ 3110 strstart(filename, "file:", &filename); 3111 3112 /* Read out options */ 3113 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 3114 BDRV_SECTOR_SIZE); 3115 if (qemu_opt_get(opts, BLOCK_OPT_EXTENT_SIZE_HINT)) { 3116 has_extent_size_hint = true; 3117 extent_size_hint = 3118 qemu_opt_get_size_del(opts, BLOCK_OPT_EXTENT_SIZE_HINT, -1); 3119 } 3120 nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false); 3121 buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); 3122 prealloc = qapi_enum_parse(&PreallocMode_lookup, buf, 3123 PREALLOC_MODE_OFF, &local_err); 3124 g_free(buf); 3125 if (local_err) { 3126 error_propagate(errp, local_err); 3127 return -EINVAL; 3128 } 3129 3130 options = (BlockdevCreateOptions) { 3131 .driver = BLOCKDEV_DRIVER_FILE, 3132 .u.file = { 3133 .filename = (char *) filename, 3134 .size = total_size, 3135 .has_preallocation = true, 3136 .preallocation = prealloc, 3137 .has_nocow = true, 3138 .nocow = nocow, 3139 .has_extent_size_hint = has_extent_size_hint, 3140 .extent_size_hint = extent_size_hint, 3141 }, 3142 }; 3143 return raw_co_create(&options, errp); 3144 } 3145 3146 static int coroutine_fn raw_co_delete_file(BlockDriverState *bs, 3147 Error **errp) 3148 { 3149 struct stat st; 3150 int ret; 3151 3152 if (!(stat(bs->filename, &st) == 0) || !S_ISREG(st.st_mode)) { 3153 error_setg_errno(errp, ENOENT, "%s is not a regular file", 3154 bs->filename); 3155 return -ENOENT; 3156 } 3157 3158 ret = unlink(bs->filename); 3159 if (ret < 0) { 3160 ret = -errno; 3161 error_setg_errno(errp, -ret, "Error when deleting file %s", 3162 bs->filename); 3163 } 3164 3165 return ret; 3166 } 3167 3168 /* 3169 * Find allocation range in @bs around offset @start. 3170 * May change underlying file descriptor's file offset. 3171 * If @start is not in a hole, store @start in @data, and the 3172 * beginning of the next hole in @hole, and return 0. 3173 * If @start is in a non-trailing hole, store @start in @hole and the 3174 * beginning of the next non-hole in @data, and return 0. 3175 * If @start is in a trailing hole or beyond EOF, return -ENXIO. 3176 * If we can't find out, return a negative errno other than -ENXIO. 3177 */ 3178 static int find_allocation(BlockDriverState *bs, off_t start, 3179 off_t *data, off_t *hole) 3180 { 3181 #if defined SEEK_HOLE && defined SEEK_DATA 3182 BDRVRawState *s = bs->opaque; 3183 off_t offs; 3184 3185 /* 3186 * SEEK_DATA cases: 3187 * D1. offs == start: start is in data 3188 * D2. offs > start: start is in a hole, next data at offs 3189 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole 3190 * or start is beyond EOF 3191 * If the latter happens, the file has been truncated behind 3192 * our back since we opened it. All bets are off then. 3193 * Treating like a trailing hole is simplest. 3194 * D4. offs < 0, errno != ENXIO: we learned nothing 3195 */ 3196 offs = lseek(s->fd, start, SEEK_DATA); 3197 if (offs < 0) { 3198 return -errno; /* D3 or D4 */ 3199 } 3200 3201 if (offs < start) { 3202 /* This is not a valid return by lseek(). We are safe to just return 3203 * -EIO in this case, and we'll treat it like D4. */ 3204 return -EIO; 3205 } 3206 3207 if (offs > start) { 3208 /* D2: in hole, next data at offs */ 3209 *hole = start; 3210 *data = offs; 3211 return 0; 3212 } 3213 3214 /* D1: in data, end not yet known */ 3215 3216 /* 3217 * SEEK_HOLE cases: 3218 * H1. offs == start: start is in a hole 3219 * If this happens here, a hole has been dug behind our back 3220 * since the previous lseek(). 3221 * H2. offs > start: either start is in data, next hole at offs, 3222 * or start is in trailing hole, EOF at offs 3223 * Linux treats trailing holes like any other hole: offs == 3224 * start. Solaris seeks to EOF instead: offs > start (blech). 3225 * If that happens here, a hole has been dug behind our back 3226 * since the previous lseek(). 3227 * H3. offs < 0, errno = ENXIO: start is beyond EOF 3228 * If this happens, the file has been truncated behind our 3229 * back since we opened it. Treat it like a trailing hole. 3230 * H4. offs < 0, errno != ENXIO: we learned nothing 3231 * Pretend we know nothing at all, i.e. "forget" about D1. 3232 */ 3233 offs = lseek(s->fd, start, SEEK_HOLE); 3234 if (offs < 0) { 3235 return -errno; /* D1 and (H3 or H4) */ 3236 } 3237 3238 if (offs < start) { 3239 /* This is not a valid return by lseek(). We are safe to just return 3240 * -EIO in this case, and we'll treat it like H4. */ 3241 return -EIO; 3242 } 3243 3244 if (offs > start) { 3245 /* 3246 * D1 and H2: either in data, next hole at offs, or it was in 3247 * data but is now in a trailing hole. In the latter case, 3248 * all bets are off. Treating it as if it there was data all 3249 * the way to EOF is safe, so simply do that. 3250 */ 3251 *data = start; 3252 *hole = offs; 3253 return 0; 3254 } 3255 3256 /* D1 and H1 */ 3257 return -EBUSY; 3258 #else 3259 return -ENOTSUP; 3260 #endif 3261 } 3262 3263 /* 3264 * Returns the allocation status of the specified offset. 3265 * 3266 * The block layer guarantees 'offset' and 'bytes' are within bounds. 3267 * 3268 * 'pnum' is set to the number of bytes (including and immediately following 3269 * the specified offset) that are known to be in the same 3270 * allocated/unallocated state. 3271 * 3272 * 'bytes' is a soft cap for 'pnum'. If the information is free, 'pnum' may 3273 * well exceed it. 3274 */ 3275 static int coroutine_fn raw_co_block_status(BlockDriverState *bs, 3276 bool want_zero, 3277 int64_t offset, 3278 int64_t bytes, int64_t *pnum, 3279 int64_t *map, 3280 BlockDriverState **file) 3281 { 3282 off_t data = 0, hole = 0; 3283 int ret; 3284 3285 assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment)); 3286 3287 ret = fd_open(bs); 3288 if (ret < 0) { 3289 return ret; 3290 } 3291 3292 if (!want_zero) { 3293 *pnum = bytes; 3294 *map = offset; 3295 *file = bs; 3296 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 3297 } 3298 3299 ret = find_allocation(bs, offset, &data, &hole); 3300 if (ret == -ENXIO) { 3301 /* Trailing hole */ 3302 *pnum = bytes; 3303 ret = BDRV_BLOCK_ZERO; 3304 } else if (ret < 0) { 3305 /* No info available, so pretend there are no holes */ 3306 *pnum = bytes; 3307 ret = BDRV_BLOCK_DATA; 3308 } else if (data == offset) { 3309 /* On a data extent, compute bytes to the end of the extent, 3310 * possibly including a partial sector at EOF. */ 3311 *pnum = hole - offset; 3312 3313 /* 3314 * We are not allowed to return partial sectors, though, so 3315 * round up if necessary. 3316 */ 3317 if (!QEMU_IS_ALIGNED(*pnum, bs->bl.request_alignment)) { 3318 int64_t file_length = raw_getlength(bs); 3319 if (file_length > 0) { 3320 /* Ignore errors, this is just a safeguard */ 3321 assert(hole == file_length); 3322 } 3323 *pnum = ROUND_UP(*pnum, bs->bl.request_alignment); 3324 } 3325 3326 ret = BDRV_BLOCK_DATA; 3327 } else { 3328 /* On a hole, compute bytes to the beginning of the next extent. */ 3329 assert(hole == offset); 3330 *pnum = data - offset; 3331 ret = BDRV_BLOCK_ZERO; 3332 } 3333 *map = offset; 3334 *file = bs; 3335 return ret | BDRV_BLOCK_OFFSET_VALID; 3336 } 3337 3338 #if defined(__linux__) 3339 /* Verify that the file is not in the page cache */ 3340 static void check_cache_dropped(BlockDriverState *bs, Error **errp) 3341 { 3342 const size_t window_size = 128 * 1024 * 1024; 3343 BDRVRawState *s = bs->opaque; 3344 void *window = NULL; 3345 size_t length = 0; 3346 unsigned char *vec; 3347 size_t page_size; 3348 off_t offset; 3349 off_t end; 3350 3351 /* mincore(2) page status information requires 1 byte per page */ 3352 page_size = sysconf(_SC_PAGESIZE); 3353 vec = g_malloc(DIV_ROUND_UP(window_size, page_size)); 3354 3355 end = raw_getlength(bs); 3356 3357 for (offset = 0; offset < end; offset += window_size) { 3358 void *new_window; 3359 size_t new_length; 3360 size_t vec_end; 3361 size_t i; 3362 int ret; 3363 3364 /* Unmap previous window if size has changed */ 3365 new_length = MIN(end - offset, window_size); 3366 if (new_length != length) { 3367 munmap(window, length); 3368 window = NULL; 3369 length = 0; 3370 } 3371 3372 new_window = mmap(window, new_length, PROT_NONE, MAP_PRIVATE, 3373 s->fd, offset); 3374 if (new_window == MAP_FAILED) { 3375 error_setg_errno(errp, errno, "mmap failed"); 3376 break; 3377 } 3378 3379 window = new_window; 3380 length = new_length; 3381 3382 ret = mincore(window, length, vec); 3383 if (ret < 0) { 3384 error_setg_errno(errp, errno, "mincore failed"); 3385 break; 3386 } 3387 3388 vec_end = DIV_ROUND_UP(length, page_size); 3389 for (i = 0; i < vec_end; i++) { 3390 if (vec[i] & 0x1) { 3391 break; 3392 } 3393 } 3394 if (i < vec_end) { 3395 error_setg(errp, "page cache still in use!"); 3396 break; 3397 } 3398 } 3399 3400 if (window) { 3401 munmap(window, length); 3402 } 3403 3404 g_free(vec); 3405 } 3406 #endif /* __linux__ */ 3407 3408 static void coroutine_fn GRAPH_RDLOCK 3409 raw_co_invalidate_cache(BlockDriverState *bs, Error **errp) 3410 { 3411 BDRVRawState *s = bs->opaque; 3412 int ret; 3413 3414 ret = fd_open(bs); 3415 if (ret < 0) { 3416 error_setg_errno(errp, -ret, "The file descriptor is not open"); 3417 return; 3418 } 3419 3420 if (!s->drop_cache) { 3421 return; 3422 } 3423 3424 if (s->open_flags & O_DIRECT) { 3425 return; /* No host kernel page cache */ 3426 } 3427 3428 #if defined(__linux__) 3429 /* This sets the scene for the next syscall... */ 3430 ret = bdrv_co_flush(bs); 3431 if (ret < 0) { 3432 error_setg_errno(errp, -ret, "flush failed"); 3433 return; 3434 } 3435 3436 /* Linux does not invalidate pages that are dirty, locked, or mmapped by a 3437 * process. These limitations are okay because we just fsynced the file, 3438 * we don't use mmap, and the file should not be in use by other processes. 3439 */ 3440 ret = posix_fadvise(s->fd, 0, 0, POSIX_FADV_DONTNEED); 3441 if (ret != 0) { /* the return value is a positive errno */ 3442 error_setg_errno(errp, ret, "fadvise failed"); 3443 return; 3444 } 3445 3446 if (s->check_cache_dropped) { 3447 check_cache_dropped(bs, errp); 3448 } 3449 #else /* __linux__ */ 3450 /* Do nothing. Live migration to a remote host with cache.direct=off is 3451 * unsupported on other host operating systems. Cache consistency issues 3452 * may occur but no error is reported here, partly because that's the 3453 * historical behavior and partly because it's hard to differentiate valid 3454 * configurations that should not cause errors. 3455 */ 3456 #endif /* !__linux__ */ 3457 } 3458 3459 static void raw_account_discard(BDRVRawState *s, uint64_t nbytes, int ret) 3460 { 3461 if (ret) { 3462 s->stats.discard_nb_failed++; 3463 } else { 3464 s->stats.discard_nb_ok++; 3465 s->stats.discard_bytes_ok += nbytes; 3466 } 3467 } 3468 3469 /* 3470 * zone report - Get a zone block device's information in the form 3471 * of an array of zone descriptors. 3472 * zones is an array of zone descriptors to hold zone information on reply; 3473 * offset can be any byte within the entire size of the device; 3474 * nr_zones is the maximum number of sectors the command should operate on. 3475 */ 3476 #if defined(CONFIG_BLKZONED) 3477 static int coroutine_fn raw_co_zone_report(BlockDriverState *bs, int64_t offset, 3478 unsigned int *nr_zones, 3479 BlockZoneDescriptor *zones) { 3480 BDRVRawState *s = bs->opaque; 3481 RawPosixAIOData acb = (RawPosixAIOData) { 3482 .bs = bs, 3483 .aio_fildes = s->fd, 3484 .aio_type = QEMU_AIO_ZONE_REPORT, 3485 .aio_offset = offset, 3486 .zone_report = { 3487 .nr_zones = nr_zones, 3488 .zones = zones, 3489 }, 3490 }; 3491 3492 trace_zbd_zone_report(bs, *nr_zones, offset >> BDRV_SECTOR_BITS); 3493 return raw_thread_pool_submit(handle_aiocb_zone_report, &acb); 3494 } 3495 #endif 3496 3497 /* 3498 * zone management operations - Execute an operation on a zone 3499 */ 3500 #if defined(CONFIG_BLKZONED) 3501 static int coroutine_fn raw_co_zone_mgmt(BlockDriverState *bs, BlockZoneOp op, 3502 int64_t offset, int64_t len) { 3503 BDRVRawState *s = bs->opaque; 3504 RawPosixAIOData acb; 3505 int64_t zone_size, zone_size_mask; 3506 const char *op_name; 3507 unsigned long zo; 3508 int ret; 3509 BlockZoneWps *wps = bs->wps; 3510 int64_t capacity = bs->total_sectors << BDRV_SECTOR_BITS; 3511 3512 zone_size = bs->bl.zone_size; 3513 zone_size_mask = zone_size - 1; 3514 if (offset & zone_size_mask) { 3515 error_report("sector offset %" PRId64 " is not aligned to zone size " 3516 "%" PRId64 "", offset / 512, zone_size / 512); 3517 return -EINVAL; 3518 } 3519 3520 if (((offset + len) < capacity && len & zone_size_mask) || 3521 offset + len > capacity) { 3522 error_report("number of sectors %" PRId64 " is not aligned to zone size" 3523 " %" PRId64 "", len / 512, zone_size / 512); 3524 return -EINVAL; 3525 } 3526 3527 uint32_t i = offset / bs->bl.zone_size; 3528 uint32_t nrz = len / bs->bl.zone_size; 3529 uint64_t *wp = &wps->wp[i]; 3530 if (BDRV_ZT_IS_CONV(*wp) && len != capacity) { 3531 error_report("zone mgmt operations are not allowed for conventional zones"); 3532 return -EIO; 3533 } 3534 3535 switch (op) { 3536 case BLK_ZO_OPEN: 3537 op_name = "BLKOPENZONE"; 3538 zo = BLKOPENZONE; 3539 break; 3540 case BLK_ZO_CLOSE: 3541 op_name = "BLKCLOSEZONE"; 3542 zo = BLKCLOSEZONE; 3543 break; 3544 case BLK_ZO_FINISH: 3545 op_name = "BLKFINISHZONE"; 3546 zo = BLKFINISHZONE; 3547 break; 3548 case BLK_ZO_RESET: 3549 op_name = "BLKRESETZONE"; 3550 zo = BLKRESETZONE; 3551 break; 3552 default: 3553 error_report("Unsupported zone op: 0x%x", op); 3554 return -ENOTSUP; 3555 } 3556 3557 acb = (RawPosixAIOData) { 3558 .bs = bs, 3559 .aio_fildes = s->fd, 3560 .aio_type = QEMU_AIO_ZONE_MGMT, 3561 .aio_offset = offset, 3562 .aio_nbytes = len, 3563 .zone_mgmt = { 3564 .op = zo, 3565 }, 3566 }; 3567 3568 trace_zbd_zone_mgmt(bs, op_name, offset >> BDRV_SECTOR_BITS, 3569 len >> BDRV_SECTOR_BITS); 3570 ret = raw_thread_pool_submit(handle_aiocb_zone_mgmt, &acb); 3571 if (ret != 0) { 3572 update_zones_wp(bs, s->fd, offset, nrz); 3573 error_report("ioctl %s failed %d", op_name, ret); 3574 return ret; 3575 } 3576 3577 if (zo == BLKRESETZONE && len == capacity) { 3578 ret = get_zones_wp(bs, s->fd, 0, bs->bl.nr_zones, 1); 3579 if (ret < 0) { 3580 error_report("reporting single wp failed"); 3581 return ret; 3582 } 3583 } else if (zo == BLKRESETZONE) { 3584 for (unsigned int j = 0; j < nrz; ++j) { 3585 wp[j] = offset + j * zone_size; 3586 } 3587 } else if (zo == BLKFINISHZONE) { 3588 for (unsigned int j = 0; j < nrz; ++j) { 3589 /* The zoned device allows the last zone smaller that the 3590 * zone size. */ 3591 wp[j] = MIN(offset + (j + 1) * zone_size, offset + len); 3592 } 3593 } 3594 3595 return ret; 3596 } 3597 #endif 3598 3599 #if defined(CONFIG_BLKZONED) 3600 static int coroutine_fn raw_co_zone_append(BlockDriverState *bs, 3601 int64_t *offset, 3602 QEMUIOVector *qiov, 3603 BdrvRequestFlags flags) { 3604 assert(flags == 0); 3605 int64_t zone_size_mask = bs->bl.zone_size - 1; 3606 int64_t iov_len = 0; 3607 int64_t len = 0; 3608 3609 if (*offset & zone_size_mask) { 3610 error_report("sector offset %" PRId64 " is not aligned to zone size " 3611 "%" PRId32 "", *offset / 512, bs->bl.zone_size / 512); 3612 return -EINVAL; 3613 } 3614 3615 int64_t wg = bs->bl.write_granularity; 3616 int64_t wg_mask = wg - 1; 3617 for (int i = 0; i < qiov->niov; i++) { 3618 iov_len = qiov->iov[i].iov_len; 3619 if (iov_len & wg_mask) { 3620 error_report("len of IOVector[%d] %" PRId64 " is not aligned to " 3621 "block size %" PRId64 "", i, iov_len, wg); 3622 return -EINVAL; 3623 } 3624 len += iov_len; 3625 } 3626 3627 trace_zbd_zone_append(bs, *offset >> BDRV_SECTOR_BITS); 3628 return raw_co_prw(bs, offset, len, qiov, QEMU_AIO_ZONE_APPEND, 0); 3629 } 3630 #endif 3631 3632 static coroutine_fn int 3633 raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes, 3634 bool blkdev) 3635 { 3636 BDRVRawState *s = bs->opaque; 3637 RawPosixAIOData acb; 3638 int ret; 3639 3640 acb = (RawPosixAIOData) { 3641 .bs = bs, 3642 .aio_fildes = s->fd, 3643 .aio_type = QEMU_AIO_DISCARD, 3644 .aio_offset = offset, 3645 .aio_nbytes = bytes, 3646 }; 3647 3648 if (blkdev) { 3649 acb.aio_type |= QEMU_AIO_BLKDEV; 3650 } 3651 3652 ret = raw_thread_pool_submit(handle_aiocb_discard, &acb); 3653 raw_account_discard(s, bytes, ret); 3654 return ret; 3655 } 3656 3657 static coroutine_fn int 3658 raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) 3659 { 3660 return raw_do_pdiscard(bs, offset, bytes, false); 3661 } 3662 3663 static int coroutine_fn 3664 raw_do_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, 3665 BdrvRequestFlags flags, bool blkdev) 3666 { 3667 BDRVRawState *s = bs->opaque; 3668 RawPosixAIOData acb; 3669 ThreadPoolFunc *handler; 3670 3671 #ifdef CONFIG_FALLOCATE 3672 if (offset + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) { 3673 BdrvTrackedRequest *req; 3674 3675 /* 3676 * This is a workaround for a bug in the Linux XFS driver, 3677 * where writes submitted through the AIO interface will be 3678 * discarded if they happen beyond a concurrently running 3679 * fallocate() that increases the file length (i.e., both the 3680 * write and the fallocate() happen beyond the EOF). 3681 * 3682 * To work around it, we extend the tracked request for this 3683 * zero write until INT64_MAX (effectively infinity), and mark 3684 * it as serializing. 3685 * 3686 * We have to enable this workaround for all filesystems and 3687 * AIO modes (not just XFS with aio=native), because for 3688 * remote filesystems we do not know the host configuration. 3689 */ 3690 3691 req = bdrv_co_get_self_request(bs); 3692 assert(req); 3693 assert(req->type == BDRV_TRACKED_WRITE); 3694 assert(req->offset <= offset); 3695 assert(req->offset + req->bytes >= offset + bytes); 3696 3697 req->bytes = BDRV_MAX_LENGTH - req->offset; 3698 3699 bdrv_check_request(req->offset, req->bytes, &error_abort); 3700 3701 bdrv_make_request_serialising(req, bs->bl.request_alignment); 3702 } 3703 #endif 3704 3705 acb = (RawPosixAIOData) { 3706 .bs = bs, 3707 .aio_fildes = s->fd, 3708 .aio_type = QEMU_AIO_WRITE_ZEROES, 3709 .aio_offset = offset, 3710 .aio_nbytes = bytes, 3711 }; 3712 3713 if (blkdev) { 3714 acb.aio_type |= QEMU_AIO_BLKDEV; 3715 } 3716 if (flags & BDRV_REQ_NO_FALLBACK) { 3717 acb.aio_type |= QEMU_AIO_NO_FALLBACK; 3718 } 3719 3720 if (flags & BDRV_REQ_MAY_UNMAP) { 3721 acb.aio_type |= QEMU_AIO_DISCARD; 3722 handler = handle_aiocb_write_zeroes_unmap; 3723 } else { 3724 handler = handle_aiocb_write_zeroes; 3725 } 3726 3727 return raw_thread_pool_submit(handler, &acb); 3728 } 3729 3730 static int coroutine_fn raw_co_pwrite_zeroes( 3731 BlockDriverState *bs, int64_t offset, 3732 int64_t bytes, BdrvRequestFlags flags) 3733 { 3734 return raw_do_pwrite_zeroes(bs, offset, bytes, flags, false); 3735 } 3736 3737 static int coroutine_fn 3738 raw_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 3739 { 3740 return 0; 3741 } 3742 3743 static ImageInfoSpecific *raw_get_specific_info(BlockDriverState *bs, 3744 Error **errp) 3745 { 3746 ImageInfoSpecificFile *file_info = g_new0(ImageInfoSpecificFile, 1); 3747 ImageInfoSpecific *spec_info = g_new(ImageInfoSpecific, 1); 3748 3749 *spec_info = (ImageInfoSpecific){ 3750 .type = IMAGE_INFO_SPECIFIC_KIND_FILE, 3751 .u.file.data = file_info, 3752 }; 3753 3754 #ifdef FS_IOC_FSGETXATTR 3755 { 3756 BDRVRawState *s = bs->opaque; 3757 struct fsxattr attr; 3758 int ret; 3759 3760 ret = ioctl(s->fd, FS_IOC_FSGETXATTR, &attr); 3761 if (!ret && attr.fsx_extsize != 0) { 3762 file_info->has_extent_size_hint = true; 3763 file_info->extent_size_hint = attr.fsx_extsize; 3764 } 3765 } 3766 #endif 3767 3768 return spec_info; 3769 } 3770 3771 static BlockStatsSpecificFile get_blockstats_specific_file(BlockDriverState *bs) 3772 { 3773 BDRVRawState *s = bs->opaque; 3774 return (BlockStatsSpecificFile) { 3775 .discard_nb_ok = s->stats.discard_nb_ok, 3776 .discard_nb_failed = s->stats.discard_nb_failed, 3777 .discard_bytes_ok = s->stats.discard_bytes_ok, 3778 }; 3779 } 3780 3781 static BlockStatsSpecific *raw_get_specific_stats(BlockDriverState *bs) 3782 { 3783 BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1); 3784 3785 stats->driver = BLOCKDEV_DRIVER_FILE; 3786 stats->u.file = get_blockstats_specific_file(bs); 3787 3788 return stats; 3789 } 3790 3791 #if defined(HAVE_HOST_BLOCK_DEVICE) 3792 static BlockStatsSpecific *hdev_get_specific_stats(BlockDriverState *bs) 3793 { 3794 BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1); 3795 3796 stats->driver = BLOCKDEV_DRIVER_HOST_DEVICE; 3797 stats->u.host_device = get_blockstats_specific_file(bs); 3798 3799 return stats; 3800 } 3801 #endif /* HAVE_HOST_BLOCK_DEVICE */ 3802 3803 static QemuOptsList raw_create_opts = { 3804 .name = "raw-create-opts", 3805 .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head), 3806 .desc = { 3807 { 3808 .name = BLOCK_OPT_SIZE, 3809 .type = QEMU_OPT_SIZE, 3810 .help = "Virtual disk size" 3811 }, 3812 { 3813 .name = BLOCK_OPT_NOCOW, 3814 .type = QEMU_OPT_BOOL, 3815 .help = "Turn off copy-on-write (valid only on btrfs)" 3816 }, 3817 { 3818 .name = BLOCK_OPT_PREALLOC, 3819 .type = QEMU_OPT_STRING, 3820 .help = "Preallocation mode (allowed values: off" 3821 #ifdef CONFIG_POSIX_FALLOCATE 3822 ", falloc" 3823 #endif 3824 ", full)" 3825 }, 3826 { 3827 .name = BLOCK_OPT_EXTENT_SIZE_HINT, 3828 .type = QEMU_OPT_SIZE, 3829 .help = "Extent size hint for the image file, 0 to disable" 3830 }, 3831 { /* end of list */ } 3832 } 3833 }; 3834 3835 static int raw_check_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared, 3836 Error **errp) 3837 { 3838 BDRVRawState *s = bs->opaque; 3839 int input_flags = s->reopen_state ? s->reopen_state->flags : bs->open_flags; 3840 int open_flags; 3841 int ret; 3842 3843 /* We may need a new fd if auto-read-only switches the mode */ 3844 ret = raw_reconfigure_getfd(bs, input_flags, &open_flags, perm, errp); 3845 if (ret < 0) { 3846 return ret; 3847 } else if (ret != s->fd) { 3848 Error *local_err = NULL; 3849 3850 /* 3851 * Fail already check_perm() if we can't get a working O_DIRECT 3852 * alignment with the new fd. 3853 */ 3854 raw_probe_alignment(bs, ret, &local_err); 3855 if (local_err) { 3856 error_propagate(errp, local_err); 3857 return -EINVAL; 3858 } 3859 3860 s->perm_change_fd = ret; 3861 s->perm_change_flags = open_flags; 3862 } 3863 3864 /* Prepare permissions on old fd to avoid conflicts between old and new, 3865 * but keep everything locked that new will need. */ 3866 ret = raw_handle_perm_lock(bs, RAW_PL_PREPARE, perm, shared, errp); 3867 if (ret < 0) { 3868 goto fail; 3869 } 3870 3871 /* Copy locks to the new fd */ 3872 if (s->perm_change_fd && s->use_lock) { 3873 ret = raw_apply_lock_bytes(NULL, s->perm_change_fd, perm, ~shared, 3874 false, errp); 3875 if (ret < 0) { 3876 raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL); 3877 goto fail; 3878 } 3879 } 3880 return 0; 3881 3882 fail: 3883 if (s->perm_change_fd) { 3884 qemu_close(s->perm_change_fd); 3885 } 3886 s->perm_change_fd = 0; 3887 return ret; 3888 } 3889 3890 static void raw_set_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared) 3891 { 3892 BDRVRawState *s = bs->opaque; 3893 3894 /* For reopen, we have already switched to the new fd (.bdrv_set_perm is 3895 * called after .bdrv_reopen_commit) */ 3896 if (s->perm_change_fd && s->fd != s->perm_change_fd) { 3897 qemu_close(s->fd); 3898 s->fd = s->perm_change_fd; 3899 s->open_flags = s->perm_change_flags; 3900 } 3901 s->perm_change_fd = 0; 3902 3903 raw_handle_perm_lock(bs, RAW_PL_COMMIT, perm, shared, NULL); 3904 s->perm = perm; 3905 s->shared_perm = shared; 3906 } 3907 3908 static void raw_abort_perm_update(BlockDriverState *bs) 3909 { 3910 BDRVRawState *s = bs->opaque; 3911 3912 /* For reopen, .bdrv_reopen_abort is called afterwards and will close 3913 * the file descriptor. */ 3914 if (s->perm_change_fd) { 3915 qemu_close(s->perm_change_fd); 3916 } 3917 s->perm_change_fd = 0; 3918 3919 raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL); 3920 } 3921 3922 static int coroutine_fn GRAPH_RDLOCK raw_co_copy_range_from( 3923 BlockDriverState *bs, BdrvChild *src, int64_t src_offset, 3924 BdrvChild *dst, int64_t dst_offset, int64_t bytes, 3925 BdrvRequestFlags read_flags, BdrvRequestFlags write_flags) 3926 { 3927 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 3928 read_flags, write_flags); 3929 } 3930 3931 static int coroutine_fn GRAPH_RDLOCK 3932 raw_co_copy_range_to(BlockDriverState *bs, 3933 BdrvChild *src, int64_t src_offset, 3934 BdrvChild *dst, int64_t dst_offset, 3935 int64_t bytes, BdrvRequestFlags read_flags, 3936 BdrvRequestFlags write_flags) 3937 { 3938 RawPosixAIOData acb; 3939 BDRVRawState *s = bs->opaque; 3940 BDRVRawState *src_s; 3941 3942 assert(dst->bs == bs); 3943 if (src->bs->drv->bdrv_co_copy_range_to != raw_co_copy_range_to) { 3944 return -ENOTSUP; 3945 } 3946 3947 src_s = src->bs->opaque; 3948 if (fd_open(src->bs) < 0 || fd_open(dst->bs) < 0) { 3949 return -EIO; 3950 } 3951 3952 acb = (RawPosixAIOData) { 3953 .bs = bs, 3954 .aio_type = QEMU_AIO_COPY_RANGE, 3955 .aio_fildes = src_s->fd, 3956 .aio_offset = src_offset, 3957 .aio_nbytes = bytes, 3958 .copy_range = { 3959 .aio_fd2 = s->fd, 3960 .aio_offset2 = dst_offset, 3961 }, 3962 }; 3963 3964 return raw_thread_pool_submit(handle_aiocb_copy_range, &acb); 3965 } 3966 3967 BlockDriver bdrv_file = { 3968 .format_name = "file", 3969 .protocol_name = "file", 3970 .instance_size = sizeof(BDRVRawState), 3971 .bdrv_needs_filename = true, 3972 .bdrv_probe = NULL, /* no probe for protocols */ 3973 .bdrv_parse_filename = raw_parse_filename, 3974 .bdrv_open = raw_open, 3975 .bdrv_reopen_prepare = raw_reopen_prepare, 3976 .bdrv_reopen_commit = raw_reopen_commit, 3977 .bdrv_reopen_abort = raw_reopen_abort, 3978 .bdrv_close = raw_close, 3979 .bdrv_co_create = raw_co_create, 3980 .bdrv_co_create_opts = raw_co_create_opts, 3981 .bdrv_has_zero_init = bdrv_has_zero_init_1, 3982 .bdrv_co_block_status = raw_co_block_status, 3983 .bdrv_co_invalidate_cache = raw_co_invalidate_cache, 3984 .bdrv_co_pwrite_zeroes = raw_co_pwrite_zeroes, 3985 .bdrv_co_delete_file = raw_co_delete_file, 3986 3987 .bdrv_co_preadv = raw_co_preadv, 3988 .bdrv_co_pwritev = raw_co_pwritev, 3989 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 3990 .bdrv_co_pdiscard = raw_co_pdiscard, 3991 .bdrv_co_copy_range_from = raw_co_copy_range_from, 3992 .bdrv_co_copy_range_to = raw_co_copy_range_to, 3993 .bdrv_refresh_limits = raw_refresh_limits, 3994 3995 .bdrv_co_truncate = raw_co_truncate, 3996 .bdrv_co_getlength = raw_co_getlength, 3997 .bdrv_co_get_info = raw_co_get_info, 3998 .bdrv_get_specific_info = raw_get_specific_info, 3999 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 4000 .bdrv_get_specific_stats = raw_get_specific_stats, 4001 .bdrv_check_perm = raw_check_perm, 4002 .bdrv_set_perm = raw_set_perm, 4003 .bdrv_abort_perm_update = raw_abort_perm_update, 4004 .create_opts = &raw_create_opts, 4005 .mutable_opts = mutable_opts, 4006 }; 4007 4008 /***********************************************/ 4009 /* host device */ 4010 4011 #if defined(HAVE_HOST_BLOCK_DEVICE) 4012 4013 #if defined(__APPLE__) && defined(__MACH__) 4014 static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath, 4015 CFIndex maxPathSize, int flags); 4016 4017 static char *FindEjectableOpticalMedia(io_iterator_t *mediaIterator) 4018 { 4019 kern_return_t kernResult = KERN_FAILURE; 4020 mach_port_t mainPort; 4021 CFMutableDictionaryRef classesToMatch; 4022 const char *matching_array[] = {kIODVDMediaClass, kIOCDMediaClass}; 4023 char *mediaType = NULL; 4024 4025 kernResult = IOMainPort(MACH_PORT_NULL, &mainPort); 4026 if ( KERN_SUCCESS != kernResult ) { 4027 printf("IOMainPort returned %d\n", kernResult); 4028 } 4029 4030 int index; 4031 for (index = 0; index < ARRAY_SIZE(matching_array); index++) { 4032 classesToMatch = IOServiceMatching(matching_array[index]); 4033 if (classesToMatch == NULL) { 4034 error_report("IOServiceMatching returned NULL for %s", 4035 matching_array[index]); 4036 continue; 4037 } 4038 CFDictionarySetValue(classesToMatch, CFSTR(kIOMediaEjectableKey), 4039 kCFBooleanTrue); 4040 kernResult = IOServiceGetMatchingServices(mainPort, classesToMatch, 4041 mediaIterator); 4042 if (kernResult != KERN_SUCCESS) { 4043 error_report("Note: IOServiceGetMatchingServices returned %d", 4044 kernResult); 4045 continue; 4046 } 4047 4048 /* If a match was found, leave the loop */ 4049 if (*mediaIterator != 0) { 4050 trace_file_FindEjectableOpticalMedia(matching_array[index]); 4051 mediaType = g_strdup(matching_array[index]); 4052 break; 4053 } 4054 } 4055 return mediaType; 4056 } 4057 4058 kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath, 4059 CFIndex maxPathSize, int flags) 4060 { 4061 io_object_t nextMedia; 4062 kern_return_t kernResult = KERN_FAILURE; 4063 *bsdPath = '\0'; 4064 nextMedia = IOIteratorNext( mediaIterator ); 4065 if ( nextMedia ) 4066 { 4067 CFTypeRef bsdPathAsCFString; 4068 bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 ); 4069 if ( bsdPathAsCFString ) { 4070 size_t devPathLength; 4071 strcpy( bsdPath, _PATH_DEV ); 4072 if (flags & BDRV_O_NOCACHE) { 4073 strcat(bsdPath, "r"); 4074 } 4075 devPathLength = strlen( bsdPath ); 4076 if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) { 4077 kernResult = KERN_SUCCESS; 4078 } 4079 CFRelease( bsdPathAsCFString ); 4080 } 4081 IOObjectRelease( nextMedia ); 4082 } 4083 4084 return kernResult; 4085 } 4086 4087 /* Sets up a real cdrom for use in QEMU */ 4088 static bool setup_cdrom(char *bsd_path, Error **errp) 4089 { 4090 int index, num_of_test_partitions = 2, fd; 4091 char test_partition[MAXPATHLEN]; 4092 bool partition_found = false; 4093 4094 /* look for a working partition */ 4095 for (index = 0; index < num_of_test_partitions; index++) { 4096 snprintf(test_partition, sizeof(test_partition), "%ss%d", bsd_path, 4097 index); 4098 fd = qemu_open(test_partition, O_RDONLY | O_BINARY | O_LARGEFILE, NULL); 4099 if (fd >= 0) { 4100 partition_found = true; 4101 qemu_close(fd); 4102 break; 4103 } 4104 } 4105 4106 /* if a working partition on the device was not found */ 4107 if (partition_found == false) { 4108 error_setg(errp, "Failed to find a working partition on disc"); 4109 } else { 4110 trace_file_setup_cdrom(test_partition); 4111 pstrcpy(bsd_path, MAXPATHLEN, test_partition); 4112 } 4113 return partition_found; 4114 } 4115 4116 /* Prints directions on mounting and unmounting a device */ 4117 static void print_unmounting_directions(const char *file_name) 4118 { 4119 error_report("If device %s is mounted on the desktop, unmount" 4120 " it first before using it in QEMU", file_name); 4121 error_report("Command to unmount device: diskutil unmountDisk %s", 4122 file_name); 4123 error_report("Command to mount device: diskutil mountDisk %s", file_name); 4124 } 4125 4126 #endif /* defined(__APPLE__) && defined(__MACH__) */ 4127 4128 static int hdev_probe_device(const char *filename) 4129 { 4130 struct stat st; 4131 4132 /* allow a dedicated CD-ROM driver to match with a higher priority */ 4133 if (strstart(filename, "/dev/cdrom", NULL)) 4134 return 50; 4135 4136 if (stat(filename, &st) >= 0 && 4137 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { 4138 return 100; 4139 } 4140 4141 return 0; 4142 } 4143 4144 static void hdev_parse_filename(const char *filename, QDict *options, 4145 Error **errp) 4146 { 4147 bdrv_parse_filename_strip_prefix(filename, "host_device:", options); 4148 } 4149 4150 static bool hdev_is_sg(BlockDriverState *bs) 4151 { 4152 4153 #if defined(__linux__) 4154 4155 BDRVRawState *s = bs->opaque; 4156 struct stat st; 4157 struct sg_scsi_id scsiid; 4158 int sg_version; 4159 int ret; 4160 4161 if (stat(bs->filename, &st) < 0 || !S_ISCHR(st.st_mode)) { 4162 return false; 4163 } 4164 4165 ret = ioctl(s->fd, SG_GET_VERSION_NUM, &sg_version); 4166 if (ret < 0) { 4167 return false; 4168 } 4169 4170 ret = ioctl(s->fd, SG_GET_SCSI_ID, &scsiid); 4171 if (ret >= 0) { 4172 trace_file_hdev_is_sg(scsiid.scsi_type, sg_version); 4173 return true; 4174 } 4175 4176 #endif 4177 4178 return false; 4179 } 4180 4181 static int hdev_open(BlockDriverState *bs, QDict *options, int flags, 4182 Error **errp) 4183 { 4184 BDRVRawState *s = bs->opaque; 4185 int ret; 4186 4187 #if defined(__APPLE__) && defined(__MACH__) 4188 /* 4189 * Caution: while qdict_get_str() is fine, getting non-string types 4190 * would require more care. When @options come from -blockdev or 4191 * blockdev_add, its members are typed according to the QAPI 4192 * schema, but when they come from -drive, they're all QString. 4193 */ 4194 const char *filename = qdict_get_str(options, "filename"); 4195 char bsd_path[MAXPATHLEN] = ""; 4196 bool error_occurred = false; 4197 4198 /* If using a real cdrom */ 4199 if (strcmp(filename, "/dev/cdrom") == 0) { 4200 char *mediaType = NULL; 4201 kern_return_t ret_val; 4202 io_iterator_t mediaIterator = 0; 4203 4204 mediaType = FindEjectableOpticalMedia(&mediaIterator); 4205 if (mediaType == NULL) { 4206 error_setg(errp, "Please make sure your CD/DVD is in the optical" 4207 " drive"); 4208 error_occurred = true; 4209 goto hdev_open_Mac_error; 4210 } 4211 4212 ret_val = GetBSDPath(mediaIterator, bsd_path, sizeof(bsd_path), flags); 4213 if (ret_val != KERN_SUCCESS) { 4214 error_setg(errp, "Could not get BSD path for optical drive"); 4215 error_occurred = true; 4216 goto hdev_open_Mac_error; 4217 } 4218 4219 /* If a real optical drive was not found */ 4220 if (bsd_path[0] == '\0') { 4221 error_setg(errp, "Failed to obtain bsd path for optical drive"); 4222 error_occurred = true; 4223 goto hdev_open_Mac_error; 4224 } 4225 4226 /* If using a cdrom disc and finding a partition on the disc failed */ 4227 if (strncmp(mediaType, kIOCDMediaClass, 9) == 0 && 4228 setup_cdrom(bsd_path, errp) == false) { 4229 print_unmounting_directions(bsd_path); 4230 error_occurred = true; 4231 goto hdev_open_Mac_error; 4232 } 4233 4234 qdict_put_str(options, "filename", bsd_path); 4235 4236 hdev_open_Mac_error: 4237 g_free(mediaType); 4238 if (mediaIterator) { 4239 IOObjectRelease(mediaIterator); 4240 } 4241 if (error_occurred) { 4242 return -ENOENT; 4243 } 4244 } 4245 #endif /* defined(__APPLE__) && defined(__MACH__) */ 4246 4247 s->type = FTYPE_FILE; 4248 4249 ret = raw_open_common(bs, options, flags, 0, true, errp); 4250 if (ret < 0) { 4251 #if defined(__APPLE__) && defined(__MACH__) 4252 if (*bsd_path) { 4253 filename = bsd_path; 4254 } 4255 /* if a physical device experienced an error while being opened */ 4256 if (strncmp(filename, "/dev/", 5) == 0) { 4257 print_unmounting_directions(filename); 4258 } 4259 #endif /* defined(__APPLE__) && defined(__MACH__) */ 4260 return ret; 4261 } 4262 4263 /* Since this does ioctl the device must be already opened */ 4264 bs->sg = hdev_is_sg(bs); 4265 4266 return ret; 4267 } 4268 4269 #if defined(__linux__) 4270 static int coroutine_fn 4271 hdev_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 4272 { 4273 BDRVRawState *s = bs->opaque; 4274 RawPosixAIOData acb; 4275 int ret; 4276 4277 ret = fd_open(bs); 4278 if (ret < 0) { 4279 return ret; 4280 } 4281 4282 if (req == SG_IO && s->pr_mgr) { 4283 struct sg_io_hdr *io_hdr = buf; 4284 if (io_hdr->cmdp[0] == PERSISTENT_RESERVE_OUT || 4285 io_hdr->cmdp[0] == PERSISTENT_RESERVE_IN) { 4286 return pr_manager_execute(s->pr_mgr, qemu_get_current_aio_context(), 4287 s->fd, io_hdr); 4288 } 4289 } 4290 4291 acb = (RawPosixAIOData) { 4292 .bs = bs, 4293 .aio_type = QEMU_AIO_IOCTL, 4294 .aio_fildes = s->fd, 4295 .aio_offset = 0, 4296 .ioctl = { 4297 .buf = buf, 4298 .cmd = req, 4299 }, 4300 }; 4301 4302 return raw_thread_pool_submit(handle_aiocb_ioctl, &acb); 4303 } 4304 #endif /* linux */ 4305 4306 static coroutine_fn int 4307 hdev_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) 4308 { 4309 BDRVRawState *s = bs->opaque; 4310 int ret; 4311 4312 ret = fd_open(bs); 4313 if (ret < 0) { 4314 raw_account_discard(s, bytes, ret); 4315 return ret; 4316 } 4317 return raw_do_pdiscard(bs, offset, bytes, true); 4318 } 4319 4320 static coroutine_fn int hdev_co_pwrite_zeroes(BlockDriverState *bs, 4321 int64_t offset, int64_t bytes, BdrvRequestFlags flags) 4322 { 4323 int rc; 4324 4325 rc = fd_open(bs); 4326 if (rc < 0) { 4327 return rc; 4328 } 4329 4330 return raw_do_pwrite_zeroes(bs, offset, bytes, flags, true); 4331 } 4332 4333 static BlockDriver bdrv_host_device = { 4334 .format_name = "host_device", 4335 .protocol_name = "host_device", 4336 .instance_size = sizeof(BDRVRawState), 4337 .bdrv_needs_filename = true, 4338 .bdrv_probe_device = hdev_probe_device, 4339 .bdrv_parse_filename = hdev_parse_filename, 4340 .bdrv_open = hdev_open, 4341 .bdrv_close = raw_close, 4342 .bdrv_reopen_prepare = raw_reopen_prepare, 4343 .bdrv_reopen_commit = raw_reopen_commit, 4344 .bdrv_reopen_abort = raw_reopen_abort, 4345 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 4346 .create_opts = &bdrv_create_opts_simple, 4347 .mutable_opts = mutable_opts, 4348 .bdrv_co_invalidate_cache = raw_co_invalidate_cache, 4349 .bdrv_co_pwrite_zeroes = hdev_co_pwrite_zeroes, 4350 4351 .bdrv_co_preadv = raw_co_preadv, 4352 .bdrv_co_pwritev = raw_co_pwritev, 4353 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 4354 .bdrv_co_pdiscard = hdev_co_pdiscard, 4355 .bdrv_co_copy_range_from = raw_co_copy_range_from, 4356 .bdrv_co_copy_range_to = raw_co_copy_range_to, 4357 .bdrv_refresh_limits = raw_refresh_limits, 4358 4359 .bdrv_co_truncate = raw_co_truncate, 4360 .bdrv_co_getlength = raw_co_getlength, 4361 .bdrv_co_get_info = raw_co_get_info, 4362 .bdrv_get_specific_info = raw_get_specific_info, 4363 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 4364 .bdrv_get_specific_stats = hdev_get_specific_stats, 4365 .bdrv_check_perm = raw_check_perm, 4366 .bdrv_set_perm = raw_set_perm, 4367 .bdrv_abort_perm_update = raw_abort_perm_update, 4368 .bdrv_probe_blocksizes = hdev_probe_blocksizes, 4369 .bdrv_probe_geometry = hdev_probe_geometry, 4370 4371 /* generic scsi device */ 4372 #ifdef __linux__ 4373 .bdrv_co_ioctl = hdev_co_ioctl, 4374 #endif 4375 4376 /* zoned device */ 4377 #if defined(CONFIG_BLKZONED) 4378 /* zone management operations */ 4379 .bdrv_co_zone_report = raw_co_zone_report, 4380 .bdrv_co_zone_mgmt = raw_co_zone_mgmt, 4381 .bdrv_co_zone_append = raw_co_zone_append, 4382 #endif 4383 }; 4384 4385 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 4386 static void cdrom_parse_filename(const char *filename, QDict *options, 4387 Error **errp) 4388 { 4389 bdrv_parse_filename_strip_prefix(filename, "host_cdrom:", options); 4390 } 4391 4392 static void cdrom_refresh_limits(BlockDriverState *bs, Error **errp) 4393 { 4394 bs->bl.has_variable_length = true; 4395 raw_refresh_limits(bs, errp); 4396 } 4397 #endif 4398 4399 #ifdef __linux__ 4400 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags, 4401 Error **errp) 4402 { 4403 BDRVRawState *s = bs->opaque; 4404 4405 s->type = FTYPE_CD; 4406 4407 /* open will not fail even if no CD is inserted, so add O_NONBLOCK */ 4408 return raw_open_common(bs, options, flags, O_NONBLOCK, true, errp); 4409 } 4410 4411 static int cdrom_probe_device(const char *filename) 4412 { 4413 int fd, ret; 4414 int prio = 0; 4415 struct stat st; 4416 4417 fd = qemu_open(filename, O_RDONLY | O_NONBLOCK, NULL); 4418 if (fd < 0) { 4419 goto out; 4420 } 4421 ret = fstat(fd, &st); 4422 if (ret == -1 || !S_ISBLK(st.st_mode)) { 4423 goto outc; 4424 } 4425 4426 /* Attempt to detect via a CDROM specific ioctl */ 4427 ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT); 4428 if (ret >= 0) 4429 prio = 100; 4430 4431 outc: 4432 qemu_close(fd); 4433 out: 4434 return prio; 4435 } 4436 4437 static bool coroutine_fn cdrom_co_is_inserted(BlockDriverState *bs) 4438 { 4439 BDRVRawState *s = bs->opaque; 4440 int ret; 4441 4442 ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT); 4443 return ret == CDS_DISC_OK; 4444 } 4445 4446 static void coroutine_fn cdrom_co_eject(BlockDriverState *bs, bool eject_flag) 4447 { 4448 BDRVRawState *s = bs->opaque; 4449 4450 if (eject_flag) { 4451 if (ioctl(s->fd, CDROMEJECT, NULL) < 0) 4452 perror("CDROMEJECT"); 4453 } else { 4454 if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0) 4455 perror("CDROMEJECT"); 4456 } 4457 } 4458 4459 static void coroutine_fn cdrom_co_lock_medium(BlockDriverState *bs, bool locked) 4460 { 4461 BDRVRawState *s = bs->opaque; 4462 4463 if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) { 4464 /* 4465 * Note: an error can happen if the distribution automatically 4466 * mounts the CD-ROM 4467 */ 4468 /* perror("CDROM_LOCKDOOR"); */ 4469 } 4470 } 4471 4472 static BlockDriver bdrv_host_cdrom = { 4473 .format_name = "host_cdrom", 4474 .protocol_name = "host_cdrom", 4475 .instance_size = sizeof(BDRVRawState), 4476 .bdrv_needs_filename = true, 4477 .bdrv_probe_device = cdrom_probe_device, 4478 .bdrv_parse_filename = cdrom_parse_filename, 4479 .bdrv_open = cdrom_open, 4480 .bdrv_close = raw_close, 4481 .bdrv_reopen_prepare = raw_reopen_prepare, 4482 .bdrv_reopen_commit = raw_reopen_commit, 4483 .bdrv_reopen_abort = raw_reopen_abort, 4484 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 4485 .create_opts = &bdrv_create_opts_simple, 4486 .mutable_opts = mutable_opts, 4487 .bdrv_co_invalidate_cache = raw_co_invalidate_cache, 4488 4489 .bdrv_co_preadv = raw_co_preadv, 4490 .bdrv_co_pwritev = raw_co_pwritev, 4491 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 4492 .bdrv_refresh_limits = cdrom_refresh_limits, 4493 4494 .bdrv_co_truncate = raw_co_truncate, 4495 .bdrv_co_getlength = raw_co_getlength, 4496 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 4497 4498 /* removable device support */ 4499 .bdrv_co_is_inserted = cdrom_co_is_inserted, 4500 .bdrv_co_eject = cdrom_co_eject, 4501 .bdrv_co_lock_medium = cdrom_co_lock_medium, 4502 4503 /* generic scsi device */ 4504 .bdrv_co_ioctl = hdev_co_ioctl, 4505 }; 4506 #endif /* __linux__ */ 4507 4508 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) 4509 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags, 4510 Error **errp) 4511 { 4512 BDRVRawState *s = bs->opaque; 4513 int ret; 4514 4515 s->type = FTYPE_CD; 4516 4517 ret = raw_open_common(bs, options, flags, 0, true, errp); 4518 if (ret) { 4519 return ret; 4520 } 4521 4522 /* make sure the door isn't locked at this time */ 4523 ioctl(s->fd, CDIOCALLOW); 4524 return 0; 4525 } 4526 4527 static int cdrom_probe_device(const char *filename) 4528 { 4529 if (strstart(filename, "/dev/cd", NULL) || 4530 strstart(filename, "/dev/acd", NULL)) 4531 return 100; 4532 return 0; 4533 } 4534 4535 static int cdrom_reopen(BlockDriverState *bs) 4536 { 4537 BDRVRawState *s = bs->opaque; 4538 int fd; 4539 4540 /* 4541 * Force reread of possibly changed/newly loaded disc, 4542 * FreeBSD seems to not notice sometimes... 4543 */ 4544 if (s->fd >= 0) 4545 qemu_close(s->fd); 4546 fd = qemu_open(bs->filename, s->open_flags, NULL); 4547 if (fd < 0) { 4548 s->fd = -1; 4549 return -EIO; 4550 } 4551 s->fd = fd; 4552 4553 /* make sure the door isn't locked at this time */ 4554 ioctl(s->fd, CDIOCALLOW); 4555 return 0; 4556 } 4557 4558 static bool coroutine_fn cdrom_co_is_inserted(BlockDriverState *bs) 4559 { 4560 return raw_getlength(bs) > 0; 4561 } 4562 4563 static void coroutine_fn cdrom_co_eject(BlockDriverState *bs, bool eject_flag) 4564 { 4565 BDRVRawState *s = bs->opaque; 4566 4567 if (s->fd < 0) 4568 return; 4569 4570 (void) ioctl(s->fd, CDIOCALLOW); 4571 4572 if (eject_flag) { 4573 if (ioctl(s->fd, CDIOCEJECT) < 0) 4574 perror("CDIOCEJECT"); 4575 } else { 4576 if (ioctl(s->fd, CDIOCCLOSE) < 0) 4577 perror("CDIOCCLOSE"); 4578 } 4579 4580 cdrom_reopen(bs); 4581 } 4582 4583 static void coroutine_fn cdrom_co_lock_medium(BlockDriverState *bs, bool locked) 4584 { 4585 BDRVRawState *s = bs->opaque; 4586 4587 if (s->fd < 0) 4588 return; 4589 if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) { 4590 /* 4591 * Note: an error can happen if the distribution automatically 4592 * mounts the CD-ROM 4593 */ 4594 /* perror("CDROM_LOCKDOOR"); */ 4595 } 4596 } 4597 4598 static BlockDriver bdrv_host_cdrom = { 4599 .format_name = "host_cdrom", 4600 .protocol_name = "host_cdrom", 4601 .instance_size = sizeof(BDRVRawState), 4602 .bdrv_needs_filename = true, 4603 .bdrv_probe_device = cdrom_probe_device, 4604 .bdrv_parse_filename = cdrom_parse_filename, 4605 .bdrv_open = cdrom_open, 4606 .bdrv_close = raw_close, 4607 .bdrv_reopen_prepare = raw_reopen_prepare, 4608 .bdrv_reopen_commit = raw_reopen_commit, 4609 .bdrv_reopen_abort = raw_reopen_abort, 4610 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 4611 .create_opts = &bdrv_create_opts_simple, 4612 .mutable_opts = mutable_opts, 4613 4614 .bdrv_co_preadv = raw_co_preadv, 4615 .bdrv_co_pwritev = raw_co_pwritev, 4616 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 4617 .bdrv_refresh_limits = cdrom_refresh_limits, 4618 4619 .bdrv_co_truncate = raw_co_truncate, 4620 .bdrv_co_getlength = raw_co_getlength, 4621 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 4622 4623 /* removable device support */ 4624 .bdrv_co_is_inserted = cdrom_co_is_inserted, 4625 .bdrv_co_eject = cdrom_co_eject, 4626 .bdrv_co_lock_medium = cdrom_co_lock_medium, 4627 }; 4628 #endif /* __FreeBSD__ */ 4629 4630 #endif /* HAVE_HOST_BLOCK_DEVICE */ 4631 4632 static void bdrv_file_init(void) 4633 { 4634 /* 4635 * Register all the drivers. Note that order is important, the driver 4636 * registered last will get probed first. 4637 */ 4638 bdrv_register(&bdrv_file); 4639 #if defined(HAVE_HOST_BLOCK_DEVICE) 4640 bdrv_register(&bdrv_host_device); 4641 #ifdef __linux__ 4642 bdrv_register(&bdrv_host_cdrom); 4643 #endif 4644 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 4645 bdrv_register(&bdrv_host_cdrom); 4646 #endif 4647 #endif /* HAVE_HOST_BLOCK_DEVICE */ 4648 } 4649 4650 block_init(bdrv_file_init); 4651