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 "qapi/qmp/qdict.h" 40 #include "qapi/qmp/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 /* OS X does not have O_DSYNC */ 114 #ifndef O_DSYNC 115 #ifdef O_SYNC 116 #define O_DSYNC O_SYNC 117 #elif defined(O_FSYNC) 118 #define O_DSYNC O_FSYNC 119 #endif 120 #endif 121 122 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */ 123 #ifndef O_DIRECT 124 #define O_DIRECT O_DSYNC 125 #endif 126 127 #define FTYPE_FILE 0 128 #define FTYPE_CD 1 129 130 #define MAX_BLOCKSIZE 4096 131 132 /* Posix file locking bytes. Libvirt takes byte 0, we start from higher bytes, 133 * leaving a few more bytes for its future use. */ 134 #define RAW_LOCK_PERM_BASE 100 135 #define RAW_LOCK_SHARED_BASE 200 136 137 typedef struct BDRVRawState { 138 int fd; 139 bool use_lock; 140 int type; 141 int open_flags; 142 size_t buf_align; 143 144 /* The current permissions. */ 145 uint64_t perm; 146 uint64_t shared_perm; 147 148 /* The perms bits whose corresponding bytes are already locked in 149 * s->fd. */ 150 uint64_t locked_perm; 151 uint64_t locked_shared_perm; 152 153 uint64_t aio_max_batch; 154 155 int perm_change_fd; 156 int perm_change_flags; 157 BDRVReopenState *reopen_state; 158 159 bool has_discard:1; 160 bool has_write_zeroes:1; 161 bool use_linux_aio:1; 162 bool use_linux_io_uring:1; 163 int64_t *offset; /* offset of zone append operation */ 164 int page_cache_inconsistent; /* errno from fdatasync failure */ 165 bool has_fallocate; 166 bool needs_alignment; 167 bool force_alignment; 168 bool drop_cache; 169 bool check_cache_dropped; 170 struct { 171 uint64_t discard_nb_ok; 172 uint64_t discard_nb_failed; 173 uint64_t discard_bytes_ok; 174 } stats; 175 176 PRManager *pr_mgr; 177 } BDRVRawState; 178 179 typedef struct BDRVRawReopenState { 180 int open_flags; 181 bool drop_cache; 182 bool check_cache_dropped; 183 } BDRVRawReopenState; 184 185 static int fd_open(BlockDriverState *bs) 186 { 187 BDRVRawState *s = bs->opaque; 188 189 /* this is just to ensure s->fd is sane (its called by io ops) */ 190 if (s->fd >= 0) { 191 return 0; 192 } 193 return -EIO; 194 } 195 196 static int64_t coroutine_fn raw_co_getlength(BlockDriverState *bs); 197 198 typedef struct RawPosixAIOData { 199 BlockDriverState *bs; 200 int aio_type; 201 int aio_fildes; 202 203 off_t aio_offset; 204 uint64_t aio_nbytes; 205 206 union { 207 struct { 208 struct iovec *iov; 209 int niov; 210 } io; 211 struct { 212 uint64_t cmd; 213 void *buf; 214 } ioctl; 215 struct { 216 int aio_fd2; 217 off_t aio_offset2; 218 } copy_range; 219 struct { 220 PreallocMode prealloc; 221 Error **errp; 222 } truncate; 223 struct { 224 unsigned int *nr_zones; 225 BlockZoneDescriptor *zones; 226 } zone_report; 227 struct { 228 unsigned long op; 229 } zone_mgmt; 230 }; 231 } RawPosixAIOData; 232 233 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 234 static int cdrom_reopen(BlockDriverState *bs); 235 #endif 236 237 /* 238 * Elide EAGAIN and EACCES details when failing to lock, as this 239 * indicates that the specified file region is already locked by 240 * another process, which is considered a common scenario. 241 */ 242 #define raw_lock_error_setg_errno(errp, err, fmt, ...) \ 243 do { \ 244 if ((err) == EAGAIN || (err) == EACCES) { \ 245 error_setg((errp), (fmt), ## __VA_ARGS__); \ 246 } else { \ 247 error_setg_errno((errp), (err), (fmt), ## __VA_ARGS__); \ 248 } \ 249 } while (0) 250 251 #if defined(__NetBSD__) 252 static int raw_normalize_devicepath(const char **filename, Error **errp) 253 { 254 static char namebuf[PATH_MAX]; 255 const char *dp, *fname; 256 struct stat sb; 257 258 fname = *filename; 259 dp = strrchr(fname, '/'); 260 if (lstat(fname, &sb) < 0) { 261 error_setg_file_open(errp, errno, fname); 262 return -errno; 263 } 264 265 if (!S_ISBLK(sb.st_mode)) { 266 return 0; 267 } 268 269 if (dp == NULL) { 270 snprintf(namebuf, PATH_MAX, "r%s", fname); 271 } else { 272 snprintf(namebuf, PATH_MAX, "%.*s/r%s", 273 (int)(dp - fname), fname, dp + 1); 274 } 275 *filename = namebuf; 276 warn_report("%s is a block device, using %s", fname, *filename); 277 278 return 0; 279 } 280 #else 281 static int raw_normalize_devicepath(const char **filename, Error **errp) 282 { 283 return 0; 284 } 285 #endif 286 287 /* 288 * Get logical block size via ioctl. On success store it in @sector_size_p. 289 */ 290 static int probe_logical_blocksize(int fd, unsigned int *sector_size_p) 291 { 292 unsigned int sector_size; 293 bool success = false; 294 int i; 295 296 errno = ENOTSUP; 297 static const unsigned long ioctl_list[] = { 298 #ifdef BLKSSZGET 299 BLKSSZGET, 300 #endif 301 #ifdef DKIOCGETBLOCKSIZE 302 DKIOCGETBLOCKSIZE, 303 #endif 304 #ifdef DIOCGSECTORSIZE 305 DIOCGSECTORSIZE, 306 #endif 307 }; 308 309 /* Try a few ioctls to get the right size */ 310 for (i = 0; i < (int)ARRAY_SIZE(ioctl_list); i++) { 311 if (ioctl(fd, ioctl_list[i], §or_size) >= 0) { 312 *sector_size_p = sector_size; 313 success = true; 314 } 315 } 316 317 return success ? 0 : -errno; 318 } 319 320 /** 321 * Get physical block size of @fd. 322 * On success, store it in @blk_size and return 0. 323 * On failure, return -errno. 324 */ 325 static int probe_physical_blocksize(int fd, unsigned int *blk_size) 326 { 327 #ifdef BLKPBSZGET 328 if (ioctl(fd, BLKPBSZGET, blk_size) < 0) { 329 return -errno; 330 } 331 return 0; 332 #else 333 return -ENOTSUP; 334 #endif 335 } 336 337 /* 338 * Returns true if no alignment restrictions are necessary even for files 339 * opened with O_DIRECT. 340 * 341 * raw_probe_alignment() probes the required alignment and assume that 1 means 342 * the probing failed, so it falls back to a safe default of 4k. This can be 343 * avoided if we know that byte alignment is okay for the file. 344 */ 345 static bool dio_byte_aligned(int fd) 346 { 347 #ifdef __linux__ 348 struct statfs buf; 349 int ret; 350 351 ret = fstatfs(fd, &buf); 352 if (ret == 0 && buf.f_type == NFS_SUPER_MAGIC) { 353 return true; 354 } 355 #endif 356 return false; 357 } 358 359 static bool raw_needs_alignment(BlockDriverState *bs) 360 { 361 BDRVRawState *s = bs->opaque; 362 363 if ((bs->open_flags & BDRV_O_NOCACHE) != 0 && !dio_byte_aligned(s->fd)) { 364 return true; 365 } 366 367 return s->force_alignment; 368 } 369 370 /* Check if read is allowed with given memory buffer and length. 371 * 372 * This function is used to check O_DIRECT memory buffer and request alignment. 373 */ 374 static bool raw_is_io_aligned(int fd, void *buf, size_t len) 375 { 376 ssize_t ret = pread(fd, buf, len, 0); 377 378 if (ret >= 0) { 379 return true; 380 } 381 382 #ifdef __linux__ 383 /* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore 384 * other errors (e.g. real I/O error), which could happen on a failed 385 * drive, since we only care about probing alignment. 386 */ 387 if (errno != EINVAL) { 388 return true; 389 } 390 #endif 391 392 return false; 393 } 394 395 static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp) 396 { 397 BDRVRawState *s = bs->opaque; 398 char *buf; 399 size_t max_align = MAX(MAX_BLOCKSIZE, qemu_real_host_page_size()); 400 size_t alignments[] = {1, 512, 1024, 2048, 4096}; 401 402 /* For SCSI generic devices the alignment is not really used. 403 With buffered I/O, we don't have any restrictions. */ 404 if (bdrv_is_sg(bs) || !s->needs_alignment) { 405 bs->bl.request_alignment = 1; 406 s->buf_align = 1; 407 return; 408 } 409 410 bs->bl.request_alignment = 0; 411 s->buf_align = 0; 412 /* Let's try to use the logical blocksize for the alignment. */ 413 if (probe_logical_blocksize(fd, &bs->bl.request_alignment) < 0) { 414 bs->bl.request_alignment = 0; 415 } 416 417 #ifdef __linux__ 418 /* 419 * The XFS ioctl definitions are shipped in extra packages that might 420 * not always be available. Since we just need the XFS_IOC_DIOINFO ioctl 421 * here, we simply use our own definition instead: 422 */ 423 struct xfs_dioattr { 424 uint32_t d_mem; 425 uint32_t d_miniosz; 426 uint32_t d_maxiosz; 427 } da; 428 if (ioctl(fd, _IOR('X', 30, struct xfs_dioattr), &da) >= 0) { 429 bs->bl.request_alignment = da.d_miniosz; 430 /* The kernel returns wrong information for d_mem */ 431 /* s->buf_align = da.d_mem; */ 432 } 433 #endif 434 435 /* 436 * If we could not get the sizes so far, we can only guess them. First try 437 * to detect request alignment, since it is more likely to succeed. Then 438 * try to detect buf_align, which cannot be detected in some cases (e.g. 439 * Gluster). If buf_align cannot be detected, we fallback to the value of 440 * request_alignment. 441 */ 442 443 if (!bs->bl.request_alignment) { 444 int i; 445 size_t align; 446 buf = qemu_memalign(max_align, max_align); 447 for (i = 0; i < ARRAY_SIZE(alignments); i++) { 448 align = alignments[i]; 449 if (raw_is_io_aligned(fd, buf, align)) { 450 /* Fallback to safe value. */ 451 bs->bl.request_alignment = (align != 1) ? align : max_align; 452 break; 453 } 454 } 455 qemu_vfree(buf); 456 } 457 458 if (!s->buf_align) { 459 int i; 460 size_t align; 461 buf = qemu_memalign(max_align, 2 * max_align); 462 for (i = 0; i < ARRAY_SIZE(alignments); i++) { 463 align = alignments[i]; 464 if (raw_is_io_aligned(fd, buf + align, max_align)) { 465 /* Fallback to request_alignment. */ 466 s->buf_align = (align != 1) ? align : bs->bl.request_alignment; 467 break; 468 } 469 } 470 qemu_vfree(buf); 471 } 472 473 if (!s->buf_align || !bs->bl.request_alignment) { 474 error_setg(errp, "Could not find working O_DIRECT alignment"); 475 error_append_hint(errp, "Try cache.direct=off\n"); 476 } 477 } 478 479 static int check_hdev_writable(int fd) 480 { 481 #if defined(BLKROGET) 482 /* Linux block devices can be configured "read-only" using blockdev(8). 483 * This is independent of device node permissions and therefore open(2) 484 * with O_RDWR succeeds. Actual writes fail with EPERM. 485 * 486 * bdrv_open() is supposed to fail if the disk is read-only. Explicitly 487 * check for read-only block devices so that Linux block devices behave 488 * properly. 489 */ 490 struct stat st; 491 int readonly = 0; 492 493 if (fstat(fd, &st)) { 494 return -errno; 495 } 496 497 if (!S_ISBLK(st.st_mode)) { 498 return 0; 499 } 500 501 if (ioctl(fd, BLKROGET, &readonly) < 0) { 502 return -errno; 503 } 504 505 if (readonly) { 506 return -EACCES; 507 } 508 #endif /* defined(BLKROGET) */ 509 return 0; 510 } 511 512 static void raw_parse_flags(int bdrv_flags, int *open_flags, bool has_writers) 513 { 514 bool read_write = false; 515 assert(open_flags != NULL); 516 517 *open_flags |= O_BINARY; 518 *open_flags &= ~O_ACCMODE; 519 520 if (bdrv_flags & BDRV_O_AUTO_RDONLY) { 521 read_write = has_writers; 522 } else if (bdrv_flags & BDRV_O_RDWR) { 523 read_write = true; 524 } 525 526 if (read_write) { 527 *open_flags |= O_RDWR; 528 } else { 529 *open_flags |= O_RDONLY; 530 } 531 532 /* Use O_DSYNC for write-through caching, no flags for write-back caching, 533 * and O_DIRECT for no caching. */ 534 if ((bdrv_flags & BDRV_O_NOCACHE)) { 535 *open_flags |= O_DIRECT; 536 } 537 } 538 539 static void raw_parse_filename(const char *filename, QDict *options, 540 Error **errp) 541 { 542 bdrv_parse_filename_strip_prefix(filename, "file:", options); 543 } 544 545 static QemuOptsList raw_runtime_opts = { 546 .name = "raw", 547 .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head), 548 .desc = { 549 { 550 .name = "filename", 551 .type = QEMU_OPT_STRING, 552 .help = "File name of the image", 553 }, 554 { 555 .name = "aio", 556 .type = QEMU_OPT_STRING, 557 .help = "host AIO implementation (threads, native, io_uring)", 558 }, 559 { 560 .name = "aio-max-batch", 561 .type = QEMU_OPT_NUMBER, 562 .help = "AIO max batch size (0 = auto handled by AIO backend, default: 0)", 563 }, 564 { 565 .name = "locking", 566 .type = QEMU_OPT_STRING, 567 .help = "file locking mode (on/off/auto, default: auto)", 568 }, 569 { 570 .name = "pr-manager", 571 .type = QEMU_OPT_STRING, 572 .help = "id of persistent reservation manager object (default: none)", 573 }, 574 #if defined(__linux__) 575 { 576 .name = "drop-cache", 577 .type = QEMU_OPT_BOOL, 578 .help = "invalidate page cache during live migration (default: on)", 579 }, 580 #endif 581 { 582 .name = "x-check-cache-dropped", 583 .type = QEMU_OPT_BOOL, 584 .help = "check that page cache was dropped on live migration (default: off)" 585 }, 586 { /* end of list */ } 587 }, 588 }; 589 590 static const char *const mutable_opts[] = { "x-check-cache-dropped", NULL }; 591 592 static int raw_open_common(BlockDriverState *bs, QDict *options, 593 int bdrv_flags, int open_flags, 594 bool device, Error **errp) 595 { 596 BDRVRawState *s = bs->opaque; 597 QemuOpts *opts; 598 Error *local_err = NULL; 599 const char *filename = NULL; 600 const char *str; 601 BlockdevAioOptions aio, aio_default; 602 int fd, ret; 603 struct stat st; 604 OnOffAuto locking; 605 606 opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); 607 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 608 ret = -EINVAL; 609 goto fail; 610 } 611 612 filename = qemu_opt_get(opts, "filename"); 613 614 ret = raw_normalize_devicepath(&filename, errp); 615 if (ret != 0) { 616 goto fail; 617 } 618 619 if (bdrv_flags & BDRV_O_NATIVE_AIO) { 620 aio_default = BLOCKDEV_AIO_OPTIONS_NATIVE; 621 #ifdef CONFIG_LINUX_IO_URING 622 } else if (bdrv_flags & BDRV_O_IO_URING) { 623 aio_default = BLOCKDEV_AIO_OPTIONS_IO_URING; 624 #endif 625 } else { 626 aio_default = BLOCKDEV_AIO_OPTIONS_THREADS; 627 } 628 629 aio = qapi_enum_parse(&BlockdevAioOptions_lookup, 630 qemu_opt_get(opts, "aio"), 631 aio_default, &local_err); 632 if (local_err) { 633 error_propagate(errp, local_err); 634 ret = -EINVAL; 635 goto fail; 636 } 637 638 s->use_linux_aio = (aio == BLOCKDEV_AIO_OPTIONS_NATIVE); 639 #ifdef CONFIG_LINUX_IO_URING 640 s->use_linux_io_uring = (aio == BLOCKDEV_AIO_OPTIONS_IO_URING); 641 #endif 642 643 s->aio_max_batch = qemu_opt_get_number(opts, "aio-max-batch", 0); 644 645 locking = qapi_enum_parse(&OnOffAuto_lookup, 646 qemu_opt_get(opts, "locking"), 647 ON_OFF_AUTO_AUTO, &local_err); 648 if (local_err) { 649 error_propagate(errp, local_err); 650 ret = -EINVAL; 651 goto fail; 652 } 653 switch (locking) { 654 case ON_OFF_AUTO_ON: 655 s->use_lock = true; 656 if (!qemu_has_ofd_lock()) { 657 warn_report("File lock requested but OFD locking syscall is " 658 "unavailable, falling back to POSIX file locks"); 659 error_printf("Due to the implementation, locks can be lost " 660 "unexpectedly.\n"); 661 } 662 break; 663 case ON_OFF_AUTO_OFF: 664 s->use_lock = false; 665 break; 666 case ON_OFF_AUTO_AUTO: 667 s->use_lock = qemu_has_ofd_lock(); 668 break; 669 default: 670 abort(); 671 } 672 673 str = qemu_opt_get(opts, "pr-manager"); 674 if (str) { 675 s->pr_mgr = pr_manager_lookup(str, &local_err); 676 if (local_err) { 677 error_propagate(errp, local_err); 678 ret = -EINVAL; 679 goto fail; 680 } 681 } 682 683 s->drop_cache = qemu_opt_get_bool(opts, "drop-cache", true); 684 s->check_cache_dropped = qemu_opt_get_bool(opts, "x-check-cache-dropped", 685 false); 686 687 s->open_flags = open_flags; 688 raw_parse_flags(bdrv_flags, &s->open_flags, false); 689 690 s->fd = -1; 691 fd = qemu_open(filename, s->open_flags, errp); 692 ret = fd < 0 ? -errno : 0; 693 694 if (ret < 0) { 695 if (ret == -EROFS) { 696 ret = -EACCES; 697 } 698 goto fail; 699 } 700 s->fd = fd; 701 702 /* Check s->open_flags rather than bdrv_flags due to auto-read-only */ 703 if (s->open_flags & O_RDWR) { 704 ret = check_hdev_writable(s->fd); 705 if (ret < 0) { 706 error_setg_errno(errp, -ret, "The device is not writable"); 707 goto fail; 708 } 709 } 710 711 s->perm = 0; 712 s->shared_perm = BLK_PERM_ALL; 713 714 #ifdef CONFIG_LINUX_AIO 715 /* Currently Linux does AIO only for files opened with O_DIRECT */ 716 if (s->use_linux_aio) { 717 if (!(s->open_flags & O_DIRECT)) { 718 error_setg(errp, "aio=native was specified, but it requires " 719 "cache.direct=on, which was not specified."); 720 ret = -EINVAL; 721 goto fail; 722 } 723 if (!aio_setup_linux_aio(bdrv_get_aio_context(bs), errp)) { 724 error_prepend(errp, "Unable to use native AIO: "); 725 goto fail; 726 } 727 } 728 #else 729 if (s->use_linux_aio) { 730 error_setg(errp, "aio=native was specified, but is not supported " 731 "in this build."); 732 ret = -EINVAL; 733 goto fail; 734 } 735 #endif /* !defined(CONFIG_LINUX_AIO) */ 736 737 #ifdef CONFIG_LINUX_IO_URING 738 if (s->use_linux_io_uring) { 739 if (!aio_setup_linux_io_uring(bdrv_get_aio_context(bs), errp)) { 740 error_prepend(errp, "Unable to use io_uring: "); 741 goto fail; 742 } 743 } 744 #else 745 if (s->use_linux_io_uring) { 746 error_setg(errp, "aio=io_uring was specified, but is not supported " 747 "in this build."); 748 ret = -EINVAL; 749 goto fail; 750 } 751 #endif /* !defined(CONFIG_LINUX_IO_URING) */ 752 753 s->has_discard = true; 754 s->has_write_zeroes = true; 755 756 if (fstat(s->fd, &st) < 0) { 757 ret = -errno; 758 error_setg_errno(errp, errno, "Could not stat file"); 759 goto fail; 760 } 761 762 if (!device) { 763 if (!S_ISREG(st.st_mode)) { 764 error_setg(errp, "'%s' driver requires '%s' to be a regular file", 765 bs->drv->format_name, bs->filename); 766 ret = -EINVAL; 767 goto fail; 768 } else { 769 s->has_fallocate = true; 770 } 771 } else { 772 if (!(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { 773 error_setg(errp, "'%s' driver requires '%s' to be either " 774 "a character or block device", 775 bs->drv->format_name, bs->filename); 776 ret = -EINVAL; 777 goto fail; 778 } 779 } 780 #ifdef CONFIG_BLKZONED 781 /* 782 * The kernel page cache does not reliably work for writes to SWR zones 783 * of zoned block device because it can not guarantee the order of writes. 784 */ 785 if ((bs->bl.zoned != BLK_Z_NONE) && 786 (!(s->open_flags & O_DIRECT))) { 787 error_setg(errp, "The driver supports zoned devices, and it requires " 788 "cache.direct=on, which was not specified."); 789 return -EINVAL; /* No host kernel page cache */ 790 } 791 #endif 792 793 if (S_ISBLK(st.st_mode)) { 794 #ifdef __linux__ 795 /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do 796 * not rely on the contents of discarded blocks unless using O_DIRECT. 797 * Same for BLKZEROOUT. 798 */ 799 if (!(bs->open_flags & BDRV_O_NOCACHE)) { 800 s->has_write_zeroes = false; 801 } 802 #endif 803 } 804 #ifdef __FreeBSD__ 805 if (S_ISCHR(st.st_mode)) { 806 /* 807 * The file is a char device (disk), which on FreeBSD isn't behind 808 * a pager, so force all requests to be aligned. This is needed 809 * so QEMU makes sure all IO operations on the device are aligned 810 * to sector size, or else FreeBSD will reject them with EINVAL. 811 */ 812 s->force_alignment = true; 813 } 814 #endif 815 s->needs_alignment = raw_needs_alignment(bs); 816 817 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK; 818 if (S_ISREG(st.st_mode)) { 819 /* When extending regular files, we get zeros from the OS */ 820 bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE; 821 } 822 ret = 0; 823 fail: 824 if (ret < 0 && s->fd != -1) { 825 qemu_close(s->fd); 826 } 827 if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) { 828 unlink(filename); 829 } 830 qemu_opts_del(opts); 831 return ret; 832 } 833 834 static int raw_open(BlockDriverState *bs, QDict *options, int flags, 835 Error **errp) 836 { 837 BDRVRawState *s = bs->opaque; 838 839 s->type = FTYPE_FILE; 840 return raw_open_common(bs, options, flags, 0, false, errp); 841 } 842 843 typedef enum { 844 RAW_PL_PREPARE, 845 RAW_PL_COMMIT, 846 RAW_PL_ABORT, 847 } RawPermLockOp; 848 849 #define PERM_FOREACH(i) \ 850 for ((i) = 0; (1ULL << (i)) <= BLK_PERM_ALL; i++) 851 852 /* Lock bytes indicated by @perm_lock_bits and @shared_perm_lock_bits in the 853 * file; if @unlock == true, also unlock the unneeded bytes. 854 * @shared_perm_lock_bits is the mask of all permissions that are NOT shared. 855 */ 856 static int raw_apply_lock_bytes(BDRVRawState *s, int fd, 857 uint64_t perm_lock_bits, 858 uint64_t shared_perm_lock_bits, 859 bool unlock, Error **errp) 860 { 861 int ret; 862 int i; 863 uint64_t locked_perm, locked_shared_perm; 864 865 if (s) { 866 locked_perm = s->locked_perm; 867 locked_shared_perm = s->locked_shared_perm; 868 } else { 869 /* 870 * We don't have the previous bits, just lock/unlock for each of the 871 * requested bits. 872 */ 873 if (unlock) { 874 locked_perm = BLK_PERM_ALL; 875 locked_shared_perm = BLK_PERM_ALL; 876 } else { 877 locked_perm = 0; 878 locked_shared_perm = 0; 879 } 880 } 881 882 PERM_FOREACH(i) { 883 int off = RAW_LOCK_PERM_BASE + i; 884 uint64_t bit = (1ULL << i); 885 if ((perm_lock_bits & bit) && !(locked_perm & bit)) { 886 ret = qemu_lock_fd(fd, off, 1, false); 887 if (ret) { 888 raw_lock_error_setg_errno(errp, -ret, "Failed to lock byte %d", 889 off); 890 return ret; 891 } else if (s) { 892 s->locked_perm |= bit; 893 } 894 } else if (unlock && (locked_perm & bit) && !(perm_lock_bits & bit)) { 895 ret = qemu_unlock_fd(fd, off, 1); 896 if (ret) { 897 error_setg_errno(errp, -ret, "Failed to unlock byte %d", off); 898 return ret; 899 } else if (s) { 900 s->locked_perm &= ~bit; 901 } 902 } 903 } 904 PERM_FOREACH(i) { 905 int off = RAW_LOCK_SHARED_BASE + i; 906 uint64_t bit = (1ULL << i); 907 if ((shared_perm_lock_bits & bit) && !(locked_shared_perm & bit)) { 908 ret = qemu_lock_fd(fd, off, 1, false); 909 if (ret) { 910 raw_lock_error_setg_errno(errp, -ret, "Failed to lock byte %d", 911 off); 912 return ret; 913 } else if (s) { 914 s->locked_shared_perm |= bit; 915 } 916 } else if (unlock && (locked_shared_perm & bit) && 917 !(shared_perm_lock_bits & bit)) { 918 ret = qemu_unlock_fd(fd, off, 1); 919 if (ret) { 920 error_setg_errno(errp, -ret, "Failed to unlock byte %d", off); 921 return ret; 922 } else if (s) { 923 s->locked_shared_perm &= ~bit; 924 } 925 } 926 } 927 return 0; 928 } 929 930 /* Check "unshared" bytes implied by @perm and ~@shared_perm in the file. */ 931 static int raw_check_lock_bytes(int fd, uint64_t perm, uint64_t shared_perm, 932 Error **errp) 933 { 934 int ret; 935 int i; 936 937 PERM_FOREACH(i) { 938 int off = RAW_LOCK_SHARED_BASE + i; 939 uint64_t p = 1ULL << i; 940 if (perm & p) { 941 ret = qemu_lock_fd_test(fd, off, 1, true); 942 if (ret) { 943 char *perm_name = bdrv_perm_names(p); 944 945 raw_lock_error_setg_errno(errp, -ret, 946 "Failed to get \"%s\" lock", 947 perm_name); 948 g_free(perm_name); 949 return ret; 950 } 951 } 952 } 953 PERM_FOREACH(i) { 954 int off = RAW_LOCK_PERM_BASE + i; 955 uint64_t p = 1ULL << i; 956 if (!(shared_perm & p)) { 957 ret = qemu_lock_fd_test(fd, off, 1, true); 958 if (ret) { 959 char *perm_name = bdrv_perm_names(p); 960 961 raw_lock_error_setg_errno(errp, -ret, 962 "Failed to get shared \"%s\" lock", 963 perm_name); 964 g_free(perm_name); 965 return ret; 966 } 967 } 968 } 969 return 0; 970 } 971 972 static int raw_handle_perm_lock(BlockDriverState *bs, 973 RawPermLockOp op, 974 uint64_t new_perm, uint64_t new_shared, 975 Error **errp) 976 { 977 BDRVRawState *s = bs->opaque; 978 int ret = 0; 979 Error *local_err = NULL; 980 981 if (!s->use_lock) { 982 return 0; 983 } 984 985 if (bdrv_get_flags(bs) & BDRV_O_INACTIVE) { 986 return 0; 987 } 988 989 switch (op) { 990 case RAW_PL_PREPARE: 991 if ((s->perm | new_perm) == s->perm && 992 (s->shared_perm & new_shared) == s->shared_perm) 993 { 994 /* 995 * We are going to unlock bytes, it should not fail. If it fail due 996 * to some fs-dependent permission-unrelated reasons (which occurs 997 * sometimes on NFS and leads to abort in bdrv_replace_child) we 998 * can't prevent such errors by any check here. And we ignore them 999 * anyway in ABORT and COMMIT. 1000 */ 1001 return 0; 1002 } 1003 ret = raw_apply_lock_bytes(s, s->fd, s->perm | new_perm, 1004 ~s->shared_perm | ~new_shared, 1005 false, errp); 1006 if (!ret) { 1007 ret = raw_check_lock_bytes(s->fd, new_perm, new_shared, errp); 1008 if (!ret) { 1009 return 0; 1010 } 1011 error_append_hint(errp, 1012 "Is another process using the image [%s]?\n", 1013 bs->filename); 1014 } 1015 /* fall through to unlock bytes. */ 1016 case RAW_PL_ABORT: 1017 raw_apply_lock_bytes(s, s->fd, s->perm, ~s->shared_perm, 1018 true, &local_err); 1019 if (local_err) { 1020 /* Theoretically the above call only unlocks bytes and it cannot 1021 * fail. Something weird happened, report it. 1022 */ 1023 warn_report_err(local_err); 1024 } 1025 break; 1026 case RAW_PL_COMMIT: 1027 raw_apply_lock_bytes(s, s->fd, new_perm, ~new_shared, 1028 true, &local_err); 1029 if (local_err) { 1030 /* Theoretically the above call only unlocks bytes and it cannot 1031 * fail. Something weird happened, report it. 1032 */ 1033 warn_report_err(local_err); 1034 } 1035 break; 1036 } 1037 return ret; 1038 } 1039 1040 /* Sets a specific flag */ 1041 static int fcntl_setfl(int fd, int flag) 1042 { 1043 int flags; 1044 1045 flags = fcntl(fd, F_GETFL); 1046 if (flags == -1) { 1047 return -errno; 1048 } 1049 if (fcntl(fd, F_SETFL, flags | flag) == -1) { 1050 return -errno; 1051 } 1052 return 0; 1053 } 1054 1055 static int raw_reconfigure_getfd(BlockDriverState *bs, int flags, 1056 int *open_flags, uint64_t perm, bool force_dup, 1057 Error **errp) 1058 { 1059 BDRVRawState *s = bs->opaque; 1060 int fd = -1; 1061 int ret; 1062 bool has_writers = perm & 1063 (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED | BLK_PERM_RESIZE); 1064 int fcntl_flags = O_APPEND | O_NONBLOCK; 1065 #ifdef O_NOATIME 1066 fcntl_flags |= O_NOATIME; 1067 #endif 1068 1069 *open_flags = 0; 1070 if (s->type == FTYPE_CD) { 1071 *open_flags |= O_NONBLOCK; 1072 } 1073 1074 raw_parse_flags(flags, open_flags, has_writers); 1075 1076 #ifdef O_ASYNC 1077 /* Not all operating systems have O_ASYNC, and those that don't 1078 * will not let us track the state into rs->open_flags (typically 1079 * you achieve the same effect with an ioctl, for example I_SETSIG 1080 * on Solaris). But we do not use O_ASYNC, so that's fine. 1081 */ 1082 assert((s->open_flags & O_ASYNC) == 0); 1083 #endif 1084 1085 if (!force_dup && *open_flags == s->open_flags) { 1086 /* We're lucky, the existing fd is fine */ 1087 return s->fd; 1088 } 1089 1090 if ((*open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) { 1091 /* dup the original fd */ 1092 fd = qemu_dup(s->fd); 1093 if (fd >= 0) { 1094 ret = fcntl_setfl(fd, *open_flags); 1095 if (ret) { 1096 qemu_close(fd); 1097 fd = -1; 1098 } 1099 } 1100 } 1101 1102 /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */ 1103 if (fd == -1) { 1104 const char *normalized_filename = bs->filename; 1105 ret = raw_normalize_devicepath(&normalized_filename, errp); 1106 if (ret >= 0) { 1107 fd = qemu_open(normalized_filename, *open_flags, errp); 1108 if (fd == -1) { 1109 return -1; 1110 } 1111 } 1112 } 1113 1114 if (fd != -1 && (*open_flags & O_RDWR)) { 1115 ret = check_hdev_writable(fd); 1116 if (ret < 0) { 1117 qemu_close(fd); 1118 error_setg_errno(errp, -ret, "The device is not writable"); 1119 return -1; 1120 } 1121 } 1122 1123 return fd; 1124 } 1125 1126 static int raw_reopen_prepare(BDRVReopenState *state, 1127 BlockReopenQueue *queue, Error **errp) 1128 { 1129 BDRVRawState *s; 1130 BDRVRawReopenState *rs; 1131 QemuOpts *opts; 1132 int ret; 1133 1134 assert(state != NULL); 1135 assert(state->bs != NULL); 1136 1137 s = state->bs->opaque; 1138 1139 state->opaque = g_new0(BDRVRawReopenState, 1); 1140 rs = state->opaque; 1141 1142 /* Handle options changes */ 1143 opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); 1144 if (!qemu_opts_absorb_qdict(opts, state->options, errp)) { 1145 ret = -EINVAL; 1146 goto out; 1147 } 1148 1149 rs->drop_cache = qemu_opt_get_bool_del(opts, "drop-cache", true); 1150 rs->check_cache_dropped = 1151 qemu_opt_get_bool_del(opts, "x-check-cache-dropped", false); 1152 1153 /* This driver's reopen function doesn't currently allow changing 1154 * other options, so let's put them back in the original QDict and 1155 * bdrv_reopen_prepare() will detect changes and complain. */ 1156 qemu_opts_to_qdict(opts, state->options); 1157 1158 /* 1159 * As part of reopen prepare we also want to create new fd by 1160 * raw_reconfigure_getfd(). But it wants updated "perm", when in 1161 * bdrv_reopen_multiple() .bdrv_reopen_prepare() callback called prior to 1162 * permission update. Happily, permission update is always a part (a seprate 1163 * stage) of bdrv_reopen_multiple() so we can rely on this fact and 1164 * reconfigure fd in raw_check_perm(). 1165 */ 1166 1167 s->reopen_state = state; 1168 ret = 0; 1169 1170 out: 1171 qemu_opts_del(opts); 1172 return ret; 1173 } 1174 1175 static void raw_reopen_commit(BDRVReopenState *state) 1176 { 1177 BDRVRawReopenState *rs = state->opaque; 1178 BDRVRawState *s = state->bs->opaque; 1179 1180 s->drop_cache = rs->drop_cache; 1181 s->check_cache_dropped = rs->check_cache_dropped; 1182 s->open_flags = rs->open_flags; 1183 g_free(state->opaque); 1184 state->opaque = NULL; 1185 1186 assert(s->reopen_state == state); 1187 s->reopen_state = NULL; 1188 } 1189 1190 1191 static void raw_reopen_abort(BDRVReopenState *state) 1192 { 1193 BDRVRawReopenState *rs = state->opaque; 1194 BDRVRawState *s = state->bs->opaque; 1195 1196 /* nothing to do if NULL, we didn't get far enough */ 1197 if (rs == NULL) { 1198 return; 1199 } 1200 1201 g_free(state->opaque); 1202 state->opaque = NULL; 1203 1204 assert(s->reopen_state == state); 1205 s->reopen_state = NULL; 1206 } 1207 1208 static int hdev_get_max_hw_transfer(int fd, struct stat *st) 1209 { 1210 #ifdef BLKSECTGET 1211 if (S_ISBLK(st->st_mode)) { 1212 unsigned short max_sectors = 0; 1213 if (ioctl(fd, BLKSECTGET, &max_sectors) == 0) { 1214 return max_sectors * 512; 1215 } 1216 } else { 1217 int max_bytes = 0; 1218 if (ioctl(fd, BLKSECTGET, &max_bytes) == 0) { 1219 return max_bytes; 1220 } 1221 } 1222 return -errno; 1223 #else 1224 return -ENOSYS; 1225 #endif 1226 } 1227 1228 /* 1229 * Get a sysfs attribute value as character string. 1230 */ 1231 #ifdef CONFIG_LINUX 1232 static int get_sysfs_str_val(struct stat *st, const char *attribute, 1233 char **val) { 1234 g_autofree char *sysfspath = NULL; 1235 int ret; 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 ret = g_file_get_contents(sysfspath, val, &len, NULL); 1246 if (ret == -1) { 1247 return -ENOENT; 1248 } 1249 1250 /* The file is ended with '\n' */ 1251 char *p; 1252 p = *val; 1253 if (*(p + len - 1) == '\n') { 1254 *(p + len - 1) = '\0'; 1255 } 1256 return ret; 1257 } 1258 #endif 1259 1260 #if defined(CONFIG_BLKZONED) 1261 static int get_sysfs_zoned_model(struct stat *st, BlockZoneModel *zoned) 1262 { 1263 g_autofree char *val = NULL; 1264 int ret; 1265 1266 ret = get_sysfs_str_val(st, "zoned", &val); 1267 if (ret < 0) { 1268 return ret; 1269 } 1270 1271 if (strcmp(val, "host-managed") == 0) { 1272 *zoned = BLK_Z_HM; 1273 } else if (strcmp(val, "host-aware") == 0) { 1274 *zoned = BLK_Z_HA; 1275 } else if (strcmp(val, "none") == 0) { 1276 *zoned = BLK_Z_NONE; 1277 } else { 1278 return -ENOTSUP; 1279 } 1280 return 0; 1281 } 1282 #endif /* defined(CONFIG_BLKZONED) */ 1283 1284 /* 1285 * Get a sysfs attribute value as a long integer. 1286 */ 1287 #ifdef CONFIG_LINUX 1288 static long get_sysfs_long_val(struct stat *st, const char *attribute) 1289 { 1290 g_autofree char *str = NULL; 1291 const char *end; 1292 long val; 1293 int ret; 1294 1295 ret = get_sysfs_str_val(st, attribute, &str); 1296 if (ret < 0) { 1297 return ret; 1298 } 1299 1300 /* The file is ended with '\n', pass 'end' to accept that. */ 1301 ret = qemu_strtol(str, &end, 10, &val); 1302 if (ret == 0 && end && *end == '\0') { 1303 ret = val; 1304 } 1305 return ret; 1306 } 1307 #endif 1308 1309 static int hdev_get_max_segments(int fd, struct stat *st) 1310 { 1311 #ifdef CONFIG_LINUX 1312 int ret; 1313 1314 if (S_ISCHR(st->st_mode)) { 1315 if (ioctl(fd, SG_GET_SG_TABLESIZE, &ret) == 0) { 1316 return ret; 1317 } 1318 return -ENOTSUP; 1319 } 1320 return get_sysfs_long_val(st, "max_segments"); 1321 #else 1322 return -ENOTSUP; 1323 #endif 1324 } 1325 1326 #if defined(CONFIG_BLKZONED) 1327 /* 1328 * If the reset_all flag is true, then the wps of zone whose state is 1329 * not readonly or offline should be all reset to the start sector. 1330 * Else, take the real wp of the device. 1331 */ 1332 static int get_zones_wp(BlockDriverState *bs, int fd, int64_t offset, 1333 unsigned int nrz, bool reset_all) 1334 { 1335 struct blk_zone *blkz; 1336 size_t rep_size; 1337 uint64_t sector = offset >> BDRV_SECTOR_BITS; 1338 BlockZoneWps *wps = bs->wps; 1339 unsigned int j = offset / bs->bl.zone_size; 1340 unsigned int n = 0, i = 0; 1341 int ret; 1342 rep_size = sizeof(struct blk_zone_report) + nrz * sizeof(struct blk_zone); 1343 g_autofree struct blk_zone_report *rep = NULL; 1344 1345 rep = g_malloc(rep_size); 1346 blkz = (struct blk_zone *)(rep + 1); 1347 while (n < nrz) { 1348 memset(rep, 0, rep_size); 1349 rep->sector = sector; 1350 rep->nr_zones = nrz - n; 1351 1352 do { 1353 ret = ioctl(fd, BLKREPORTZONE, rep); 1354 } while (ret != 0 && errno == EINTR); 1355 if (ret != 0) { 1356 error_report("%d: ioctl BLKREPORTZONE at %" PRId64 " failed %d", 1357 fd, offset, errno); 1358 return -errno; 1359 } 1360 1361 if (!rep->nr_zones) { 1362 break; 1363 } 1364 1365 for (i = 0; i < rep->nr_zones; ++i, ++n, ++j) { 1366 /* 1367 * The wp tracking cares only about sequential writes required and 1368 * sequential write preferred zones so that the wp can advance to 1369 * the right location. 1370 * Use the most significant bit of the wp location to indicate the 1371 * zone type: 0 for SWR/SWP zones and 1 for conventional zones. 1372 */ 1373 if (blkz[i].type == BLK_ZONE_TYPE_CONVENTIONAL) { 1374 wps->wp[j] |= 1ULL << 63; 1375 } else { 1376 switch(blkz[i].cond) { 1377 case BLK_ZONE_COND_FULL: 1378 case BLK_ZONE_COND_READONLY: 1379 /* Zone not writable */ 1380 wps->wp[j] = (blkz[i].start + blkz[i].len) << BDRV_SECTOR_BITS; 1381 break; 1382 case BLK_ZONE_COND_OFFLINE: 1383 /* Zone not writable nor readable */ 1384 wps->wp[j] = (blkz[i].start) << BDRV_SECTOR_BITS; 1385 break; 1386 default: 1387 if (reset_all) { 1388 wps->wp[j] = blkz[i].start << BDRV_SECTOR_BITS; 1389 } else { 1390 wps->wp[j] = blkz[i].wp << BDRV_SECTOR_BITS; 1391 } 1392 break; 1393 } 1394 } 1395 } 1396 sector = blkz[i - 1].start + blkz[i - 1].len; 1397 } 1398 1399 return 0; 1400 } 1401 1402 static void update_zones_wp(BlockDriverState *bs, int fd, int64_t offset, 1403 unsigned int nrz) 1404 { 1405 if (get_zones_wp(bs, fd, offset, nrz, 0) < 0) { 1406 error_report("update zone wp failed"); 1407 } 1408 } 1409 1410 static void raw_refresh_zoned_limits(BlockDriverState *bs, struct stat *st, 1411 Error **errp) 1412 { 1413 BDRVRawState *s = bs->opaque; 1414 BlockZoneModel zoned; 1415 int ret; 1416 1417 bs->bl.zoned = BLK_Z_NONE; 1418 1419 ret = get_sysfs_zoned_model(st, &zoned); 1420 if (ret < 0 || zoned == BLK_Z_NONE) { 1421 return; 1422 } 1423 bs->bl.zoned = zoned; 1424 1425 ret = get_sysfs_long_val(st, "max_open_zones"); 1426 if (ret >= 0) { 1427 bs->bl.max_open_zones = ret; 1428 } 1429 1430 ret = get_sysfs_long_val(st, "max_active_zones"); 1431 if (ret >= 0) { 1432 bs->bl.max_active_zones = ret; 1433 } 1434 1435 /* 1436 * The zoned device must at least have zone size and nr_zones fields. 1437 */ 1438 ret = get_sysfs_long_val(st, "chunk_sectors"); 1439 if (ret < 0) { 1440 error_setg_errno(errp, -ret, "Unable to read chunk_sectors " 1441 "sysfs attribute"); 1442 return; 1443 } else if (!ret) { 1444 error_setg(errp, "Read 0 from chunk_sectors sysfs attribute"); 1445 return; 1446 } 1447 bs->bl.zone_size = ret << BDRV_SECTOR_BITS; 1448 1449 ret = get_sysfs_long_val(st, "nr_zones"); 1450 if (ret < 0) { 1451 error_setg_errno(errp, -ret, "Unable to read nr_zones " 1452 "sysfs attribute"); 1453 return; 1454 } else if (!ret) { 1455 error_setg(errp, "Read 0 from nr_zones sysfs attribute"); 1456 return; 1457 } 1458 bs->bl.nr_zones = ret; 1459 1460 ret = get_sysfs_long_val(st, "zone_append_max_bytes"); 1461 if (ret > 0) { 1462 bs->bl.max_append_sectors = ret >> BDRV_SECTOR_BITS; 1463 } 1464 1465 ret = get_sysfs_long_val(st, "physical_block_size"); 1466 if (ret >= 0) { 1467 bs->bl.write_granularity = ret; 1468 } 1469 1470 /* The refresh_limits() function can be called multiple times. */ 1471 g_free(bs->wps); 1472 bs->wps = g_malloc(sizeof(BlockZoneWps) + 1473 sizeof(int64_t) * bs->bl.nr_zones); 1474 ret = get_zones_wp(bs, s->fd, 0, bs->bl.nr_zones, 0); 1475 if (ret < 0) { 1476 error_setg_errno(errp, -ret, "report wps failed"); 1477 bs->wps = NULL; 1478 return; 1479 } 1480 qemu_co_mutex_init(&bs->wps->colock); 1481 } 1482 #else /* !defined(CONFIG_BLKZONED) */ 1483 static void raw_refresh_zoned_limits(BlockDriverState *bs, struct stat *st, 1484 Error **errp) 1485 { 1486 bs->bl.zoned = BLK_Z_NONE; 1487 } 1488 #endif /* !defined(CONFIG_BLKZONED) */ 1489 1490 static void raw_refresh_limits(BlockDriverState *bs, Error **errp) 1491 { 1492 BDRVRawState *s = bs->opaque; 1493 struct stat st; 1494 1495 s->needs_alignment = raw_needs_alignment(bs); 1496 raw_probe_alignment(bs, s->fd, errp); 1497 1498 bs->bl.min_mem_alignment = s->buf_align; 1499 bs->bl.opt_mem_alignment = MAX(s->buf_align, qemu_real_host_page_size()); 1500 1501 /* 1502 * Maximum transfers are best effort, so it is okay to ignore any 1503 * errors. That said, based on the man page errors in fstat would be 1504 * very much unexpected; the only possible case seems to be ENOMEM. 1505 */ 1506 if (fstat(s->fd, &st)) { 1507 return; 1508 } 1509 1510 #if defined(__APPLE__) && (__MACH__) 1511 struct statfs buf; 1512 1513 if (!fstatfs(s->fd, &buf)) { 1514 bs->bl.opt_transfer = buf.f_iosize; 1515 bs->bl.pdiscard_alignment = buf.f_bsize; 1516 } 1517 #endif 1518 1519 if (bdrv_is_sg(bs) || S_ISBLK(st.st_mode)) { 1520 int ret = hdev_get_max_hw_transfer(s->fd, &st); 1521 1522 if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) { 1523 bs->bl.max_hw_transfer = ret; 1524 } 1525 1526 ret = hdev_get_max_segments(s->fd, &st); 1527 if (ret > 0) { 1528 bs->bl.max_hw_iov = ret; 1529 } 1530 } 1531 1532 raw_refresh_zoned_limits(bs, &st, errp); 1533 } 1534 1535 static int check_for_dasd(int fd) 1536 { 1537 #ifdef BIODASDINFO2 1538 struct dasd_information2_t info = {0}; 1539 1540 return ioctl(fd, BIODASDINFO2, &info); 1541 #else 1542 return -1; 1543 #endif 1544 } 1545 1546 /** 1547 * Try to get @bs's logical and physical block size. 1548 * On success, store them in @bsz and return zero. 1549 * On failure, return negative errno. 1550 */ 1551 static int hdev_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) 1552 { 1553 BDRVRawState *s = bs->opaque; 1554 int ret; 1555 1556 /* If DASD or zoned devices, get blocksizes */ 1557 if (check_for_dasd(s->fd) < 0) { 1558 /* zoned devices are not DASD */ 1559 if (bs->bl.zoned == BLK_Z_NONE) { 1560 return -ENOTSUP; 1561 } 1562 } 1563 ret = probe_logical_blocksize(s->fd, &bsz->log); 1564 if (ret < 0) { 1565 return ret; 1566 } 1567 return probe_physical_blocksize(s->fd, &bsz->phys); 1568 } 1569 1570 /** 1571 * Try to get @bs's geometry: cyls, heads, sectors. 1572 * On success, store them in @geo and return 0. 1573 * On failure return -errno. 1574 * (Allows block driver to assign default geometry values that guest sees) 1575 */ 1576 #ifdef __linux__ 1577 static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo) 1578 { 1579 BDRVRawState *s = bs->opaque; 1580 struct hd_geometry ioctl_geo = {0}; 1581 1582 /* If DASD, get its geometry */ 1583 if (check_for_dasd(s->fd) < 0) { 1584 return -ENOTSUP; 1585 } 1586 if (ioctl(s->fd, HDIO_GETGEO, &ioctl_geo) < 0) { 1587 return -errno; 1588 } 1589 /* HDIO_GETGEO may return success even though geo contains zeros 1590 (e.g. certain multipath setups) */ 1591 if (!ioctl_geo.heads || !ioctl_geo.sectors || !ioctl_geo.cylinders) { 1592 return -ENOTSUP; 1593 } 1594 /* Do not return a geometry for partition */ 1595 if (ioctl_geo.start != 0) { 1596 return -ENOTSUP; 1597 } 1598 geo->heads = ioctl_geo.heads; 1599 geo->sectors = ioctl_geo.sectors; 1600 geo->cylinders = ioctl_geo.cylinders; 1601 1602 return 0; 1603 } 1604 #else /* __linux__ */ 1605 static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo) 1606 { 1607 return -ENOTSUP; 1608 } 1609 #endif 1610 1611 #if defined(__linux__) 1612 static int handle_aiocb_ioctl(void *opaque) 1613 { 1614 RawPosixAIOData *aiocb = opaque; 1615 int ret; 1616 1617 ret = RETRY_ON_EINTR( 1618 ioctl(aiocb->aio_fildes, aiocb->ioctl.cmd, aiocb->ioctl.buf) 1619 ); 1620 if (ret == -1) { 1621 return -errno; 1622 } 1623 1624 return 0; 1625 } 1626 #endif /* linux */ 1627 1628 static int handle_aiocb_flush(void *opaque) 1629 { 1630 RawPosixAIOData *aiocb = opaque; 1631 BDRVRawState *s = aiocb->bs->opaque; 1632 int ret; 1633 1634 if (s->page_cache_inconsistent) { 1635 return -s->page_cache_inconsistent; 1636 } 1637 1638 ret = qemu_fdatasync(aiocb->aio_fildes); 1639 if (ret == -1) { 1640 trace_file_flush_fdatasync_failed(errno); 1641 1642 /* There is no clear definition of the semantics of a failing fsync(), 1643 * so we may have to assume the worst. The sad truth is that this 1644 * assumption is correct for Linux. Some pages are now probably marked 1645 * clean in the page cache even though they are inconsistent with the 1646 * on-disk contents. The next fdatasync() call would succeed, but no 1647 * further writeback attempt will be made. We can't get back to a state 1648 * in which we know what is on disk (we would have to rewrite 1649 * everything that was touched since the last fdatasync() at least), so 1650 * make bdrv_flush() fail permanently. Given that the behaviour isn't 1651 * really defined, I have little hope that other OSes are doing better. 1652 * 1653 * Obviously, this doesn't affect O_DIRECT, which bypasses the page 1654 * cache. */ 1655 if ((s->open_flags & O_DIRECT) == 0) { 1656 s->page_cache_inconsistent = errno; 1657 } 1658 return -errno; 1659 } 1660 return 0; 1661 } 1662 1663 #ifdef CONFIG_PREADV 1664 1665 static bool preadv_present = true; 1666 1667 static ssize_t 1668 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1669 { 1670 return preadv(fd, iov, nr_iov, offset); 1671 } 1672 1673 static ssize_t 1674 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1675 { 1676 return pwritev(fd, iov, nr_iov, offset); 1677 } 1678 1679 #else 1680 1681 static bool preadv_present = false; 1682 1683 static ssize_t 1684 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1685 { 1686 return -ENOSYS; 1687 } 1688 1689 static ssize_t 1690 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1691 { 1692 return -ENOSYS; 1693 } 1694 1695 #endif 1696 1697 static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb) 1698 { 1699 ssize_t len; 1700 1701 len = RETRY_ON_EINTR( 1702 (aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) ? 1703 qemu_pwritev(aiocb->aio_fildes, 1704 aiocb->io.iov, 1705 aiocb->io.niov, 1706 aiocb->aio_offset) : 1707 qemu_preadv(aiocb->aio_fildes, 1708 aiocb->io.iov, 1709 aiocb->io.niov, 1710 aiocb->aio_offset) 1711 ); 1712 1713 if (len == -1) { 1714 return -errno; 1715 } 1716 return len; 1717 } 1718 1719 /* 1720 * Read/writes the data to/from a given linear buffer. 1721 * 1722 * Returns the number of bytes handles or -errno in case of an error. Short 1723 * reads are only returned if the end of the file is reached. 1724 */ 1725 static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf) 1726 { 1727 ssize_t offset = 0; 1728 ssize_t len; 1729 1730 while (offset < aiocb->aio_nbytes) { 1731 if (aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) { 1732 len = pwrite(aiocb->aio_fildes, 1733 (const char *)buf + offset, 1734 aiocb->aio_nbytes - offset, 1735 aiocb->aio_offset + offset); 1736 } else { 1737 len = pread(aiocb->aio_fildes, 1738 buf + offset, 1739 aiocb->aio_nbytes - offset, 1740 aiocb->aio_offset + offset); 1741 } 1742 if (len == -1 && errno == EINTR) { 1743 continue; 1744 } else if (len == -1 && errno == EINVAL && 1745 (aiocb->bs->open_flags & BDRV_O_NOCACHE) && 1746 !(aiocb->aio_type & QEMU_AIO_WRITE) && 1747 offset > 0) { 1748 /* O_DIRECT pread() may fail with EINVAL when offset is unaligned 1749 * after a short read. Assume that O_DIRECT short reads only occur 1750 * at EOF. Therefore this is a short read, not an I/O error. 1751 */ 1752 break; 1753 } else if (len == -1) { 1754 offset = -errno; 1755 break; 1756 } else if (len == 0) { 1757 break; 1758 } 1759 offset += len; 1760 } 1761 1762 return offset; 1763 } 1764 1765 static int handle_aiocb_rw(void *opaque) 1766 { 1767 RawPosixAIOData *aiocb = opaque; 1768 ssize_t nbytes; 1769 char *buf; 1770 1771 if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) { 1772 /* 1773 * If there is just a single buffer, and it is properly aligned 1774 * we can just use plain pread/pwrite without any problems. 1775 */ 1776 if (aiocb->io.niov == 1) { 1777 nbytes = handle_aiocb_rw_linear(aiocb, aiocb->io.iov->iov_base); 1778 goto out; 1779 } 1780 /* 1781 * We have more than one iovec, and all are properly aligned. 1782 * 1783 * Try preadv/pwritev first and fall back to linearizing the 1784 * buffer if it's not supported. 1785 */ 1786 if (preadv_present) { 1787 nbytes = handle_aiocb_rw_vector(aiocb); 1788 if (nbytes == aiocb->aio_nbytes || 1789 (nbytes < 0 && nbytes != -ENOSYS)) { 1790 goto out; 1791 } 1792 preadv_present = false; 1793 } 1794 1795 /* 1796 * XXX(hch): short read/write. no easy way to handle the reminder 1797 * using these interfaces. For now retry using plain 1798 * pread/pwrite? 1799 */ 1800 } 1801 1802 /* 1803 * Ok, we have to do it the hard way, copy all segments into 1804 * a single aligned buffer. 1805 */ 1806 buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes); 1807 if (buf == NULL) { 1808 nbytes = -ENOMEM; 1809 goto out; 1810 } 1811 1812 if (aiocb->aio_type & QEMU_AIO_WRITE) { 1813 char *p = buf; 1814 int i; 1815 1816 for (i = 0; i < aiocb->io.niov; ++i) { 1817 memcpy(p, aiocb->io.iov[i].iov_base, aiocb->io.iov[i].iov_len); 1818 p += aiocb->io.iov[i].iov_len; 1819 } 1820 assert(p - buf == aiocb->aio_nbytes); 1821 } 1822 1823 nbytes = handle_aiocb_rw_linear(aiocb, buf); 1824 if (!(aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND))) { 1825 char *p = buf; 1826 size_t count = aiocb->aio_nbytes, copy; 1827 int i; 1828 1829 for (i = 0; i < aiocb->io.niov && count; ++i) { 1830 copy = count; 1831 if (copy > aiocb->io.iov[i].iov_len) { 1832 copy = aiocb->io.iov[i].iov_len; 1833 } 1834 memcpy(aiocb->io.iov[i].iov_base, p, copy); 1835 assert(count >= copy); 1836 p += copy; 1837 count -= copy; 1838 } 1839 assert(count == 0); 1840 } 1841 qemu_vfree(buf); 1842 1843 out: 1844 if (nbytes == aiocb->aio_nbytes) { 1845 return 0; 1846 } else if (nbytes >= 0 && nbytes < aiocb->aio_nbytes) { 1847 if (aiocb->aio_type & QEMU_AIO_WRITE) { 1848 return -EINVAL; 1849 } else { 1850 iov_memset(aiocb->io.iov, aiocb->io.niov, nbytes, 1851 0, aiocb->aio_nbytes - nbytes); 1852 return 0; 1853 } 1854 } else { 1855 assert(nbytes < 0); 1856 return nbytes; 1857 } 1858 } 1859 1860 #if defined(CONFIG_FALLOCATE) || defined(BLKZEROOUT) || defined(BLKDISCARD) 1861 static int translate_err(int err) 1862 { 1863 if (err == -ENODEV || err == -ENOSYS || err == -EOPNOTSUPP || 1864 err == -ENOTTY) { 1865 err = -ENOTSUP; 1866 } 1867 return err; 1868 } 1869 #endif 1870 1871 #ifdef CONFIG_FALLOCATE 1872 static int do_fallocate(int fd, int mode, off_t offset, off_t len) 1873 { 1874 do { 1875 if (fallocate(fd, mode, offset, len) == 0) { 1876 return 0; 1877 } 1878 } while (errno == EINTR); 1879 return translate_err(-errno); 1880 } 1881 #endif 1882 1883 static ssize_t handle_aiocb_write_zeroes_block(RawPosixAIOData *aiocb) 1884 { 1885 int ret = -ENOTSUP; 1886 BDRVRawState *s = aiocb->bs->opaque; 1887 1888 if (!s->has_write_zeroes) { 1889 return -ENOTSUP; 1890 } 1891 1892 #ifdef BLKZEROOUT 1893 /* The BLKZEROOUT implementation in the kernel doesn't set 1894 * BLKDEV_ZERO_NOFALLBACK, so we can't call this if we have to avoid slow 1895 * fallbacks. */ 1896 if (!(aiocb->aio_type & QEMU_AIO_NO_FALLBACK)) { 1897 do { 1898 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes }; 1899 if (ioctl(aiocb->aio_fildes, BLKZEROOUT, range) == 0) { 1900 return 0; 1901 } 1902 } while (errno == EINTR); 1903 1904 ret = translate_err(-errno); 1905 if (ret == -ENOTSUP) { 1906 s->has_write_zeroes = false; 1907 } 1908 } 1909 #endif 1910 1911 return ret; 1912 } 1913 1914 static int handle_aiocb_write_zeroes(void *opaque) 1915 { 1916 RawPosixAIOData *aiocb = opaque; 1917 #ifdef CONFIG_FALLOCATE 1918 BDRVRawState *s = aiocb->bs->opaque; 1919 int64_t len; 1920 #endif 1921 1922 if (aiocb->aio_type & QEMU_AIO_BLKDEV) { 1923 return handle_aiocb_write_zeroes_block(aiocb); 1924 } 1925 1926 #ifdef CONFIG_FALLOCATE_ZERO_RANGE 1927 if (s->has_write_zeroes) { 1928 int ret = do_fallocate(s->fd, FALLOC_FL_ZERO_RANGE, 1929 aiocb->aio_offset, aiocb->aio_nbytes); 1930 if (ret == -ENOTSUP) { 1931 s->has_write_zeroes = false; 1932 } else if (ret == 0 || ret != -EINVAL) { 1933 return ret; 1934 } 1935 /* 1936 * Note: Some file systems do not like unaligned byte ranges, and 1937 * return EINVAL in such a case, though they should not do it according 1938 * to the man-page of fallocate(). Thus we simply ignore this return 1939 * value and try the other fallbacks instead. 1940 */ 1941 } 1942 #endif 1943 1944 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE 1945 if (s->has_discard && s->has_fallocate) { 1946 int ret = do_fallocate(s->fd, 1947 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 1948 aiocb->aio_offset, aiocb->aio_nbytes); 1949 if (ret == 0) { 1950 ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes); 1951 if (ret == 0 || ret != -ENOTSUP) { 1952 return ret; 1953 } 1954 s->has_fallocate = false; 1955 } else if (ret == -EINVAL) { 1956 /* 1957 * Some file systems like older versions of GPFS do not like un- 1958 * aligned byte ranges, and return EINVAL in such a case, though 1959 * they should not do it according to the man-page of fallocate(). 1960 * Warn about the bad filesystem and try the final fallback instead. 1961 */ 1962 warn_report_once("Your file system is misbehaving: " 1963 "fallocate(FALLOC_FL_PUNCH_HOLE) returned EINVAL. " 1964 "Please report this bug to your file system " 1965 "vendor."); 1966 } else if (ret != -ENOTSUP) { 1967 return ret; 1968 } else { 1969 s->has_discard = false; 1970 } 1971 } 1972 #endif 1973 1974 #ifdef CONFIG_FALLOCATE 1975 /* Last resort: we are trying to extend the file with zeroed data. This 1976 * can be done via fallocate(fd, 0) */ 1977 len = raw_co_getlength(aiocb->bs); 1978 if (s->has_fallocate && len >= 0 && aiocb->aio_offset >= len) { 1979 int ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes); 1980 if (ret == 0 || ret != -ENOTSUP) { 1981 return ret; 1982 } 1983 s->has_fallocate = false; 1984 } 1985 #endif 1986 1987 return -ENOTSUP; 1988 } 1989 1990 static int handle_aiocb_write_zeroes_unmap(void *opaque) 1991 { 1992 RawPosixAIOData *aiocb = opaque; 1993 BDRVRawState *s G_GNUC_UNUSED = aiocb->bs->opaque; 1994 1995 /* First try to write zeros and unmap at the same time */ 1996 1997 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE 1998 int ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 1999 aiocb->aio_offset, aiocb->aio_nbytes); 2000 switch (ret) { 2001 case -ENOTSUP: 2002 case -EINVAL: 2003 case -EBUSY: 2004 break; 2005 default: 2006 return ret; 2007 } 2008 #endif 2009 2010 /* If we couldn't manage to unmap while guaranteed that the area reads as 2011 * all-zero afterwards, just write zeroes without unmapping */ 2012 return handle_aiocb_write_zeroes(aiocb); 2013 } 2014 2015 #ifndef HAVE_COPY_FILE_RANGE 2016 static off_t copy_file_range(int in_fd, off_t *in_off, int out_fd, 2017 off_t *out_off, size_t len, unsigned int flags) 2018 { 2019 #ifdef __NR_copy_file_range 2020 return syscall(__NR_copy_file_range, in_fd, in_off, out_fd, 2021 out_off, len, flags); 2022 #else 2023 errno = ENOSYS; 2024 return -1; 2025 #endif 2026 } 2027 #endif 2028 2029 /* 2030 * parse_zone - Fill a zone descriptor 2031 */ 2032 #if defined(CONFIG_BLKZONED) 2033 static inline int parse_zone(struct BlockZoneDescriptor *zone, 2034 const struct blk_zone *blkz) { 2035 zone->start = blkz->start << BDRV_SECTOR_BITS; 2036 zone->length = blkz->len << BDRV_SECTOR_BITS; 2037 zone->wp = blkz->wp << BDRV_SECTOR_BITS; 2038 2039 #ifdef HAVE_BLK_ZONE_REP_CAPACITY 2040 zone->cap = blkz->capacity << BDRV_SECTOR_BITS; 2041 #else 2042 zone->cap = blkz->len << BDRV_SECTOR_BITS; 2043 #endif 2044 2045 switch (blkz->type) { 2046 case BLK_ZONE_TYPE_SEQWRITE_REQ: 2047 zone->type = BLK_ZT_SWR; 2048 break; 2049 case BLK_ZONE_TYPE_SEQWRITE_PREF: 2050 zone->type = BLK_ZT_SWP; 2051 break; 2052 case BLK_ZONE_TYPE_CONVENTIONAL: 2053 zone->type = BLK_ZT_CONV; 2054 break; 2055 default: 2056 error_report("Unsupported zone type: 0x%x", blkz->type); 2057 return -ENOTSUP; 2058 } 2059 2060 switch (blkz->cond) { 2061 case BLK_ZONE_COND_NOT_WP: 2062 zone->state = BLK_ZS_NOT_WP; 2063 break; 2064 case BLK_ZONE_COND_EMPTY: 2065 zone->state = BLK_ZS_EMPTY; 2066 break; 2067 case BLK_ZONE_COND_IMP_OPEN: 2068 zone->state = BLK_ZS_IOPEN; 2069 break; 2070 case BLK_ZONE_COND_EXP_OPEN: 2071 zone->state = BLK_ZS_EOPEN; 2072 break; 2073 case BLK_ZONE_COND_CLOSED: 2074 zone->state = BLK_ZS_CLOSED; 2075 break; 2076 case BLK_ZONE_COND_READONLY: 2077 zone->state = BLK_ZS_RDONLY; 2078 break; 2079 case BLK_ZONE_COND_FULL: 2080 zone->state = BLK_ZS_FULL; 2081 break; 2082 case BLK_ZONE_COND_OFFLINE: 2083 zone->state = BLK_ZS_OFFLINE; 2084 break; 2085 default: 2086 error_report("Unsupported zone state: 0x%x", blkz->cond); 2087 return -ENOTSUP; 2088 } 2089 return 0; 2090 } 2091 #endif 2092 2093 #if defined(CONFIG_BLKZONED) 2094 static int handle_aiocb_zone_report(void *opaque) 2095 { 2096 RawPosixAIOData *aiocb = opaque; 2097 int fd = aiocb->aio_fildes; 2098 unsigned int *nr_zones = aiocb->zone_report.nr_zones; 2099 BlockZoneDescriptor *zones = aiocb->zone_report.zones; 2100 /* zoned block devices use 512-byte sectors */ 2101 uint64_t sector = aiocb->aio_offset / 512; 2102 2103 struct blk_zone *blkz; 2104 size_t rep_size; 2105 unsigned int nrz; 2106 int ret; 2107 unsigned int n = 0, i = 0; 2108 2109 nrz = *nr_zones; 2110 rep_size = sizeof(struct blk_zone_report) + nrz * sizeof(struct blk_zone); 2111 g_autofree struct blk_zone_report *rep = NULL; 2112 rep = g_malloc(rep_size); 2113 2114 blkz = (struct blk_zone *)(rep + 1); 2115 while (n < nrz) { 2116 memset(rep, 0, rep_size); 2117 rep->sector = sector; 2118 rep->nr_zones = nrz - n; 2119 2120 do { 2121 ret = ioctl(fd, BLKREPORTZONE, rep); 2122 } while (ret != 0 && errno == EINTR); 2123 if (ret != 0) { 2124 error_report("%d: ioctl BLKREPORTZONE at %" PRId64 " failed %d", 2125 fd, sector, errno); 2126 return -errno; 2127 } 2128 2129 if (!rep->nr_zones) { 2130 break; 2131 } 2132 2133 for (i = 0; i < rep->nr_zones; i++, n++) { 2134 ret = parse_zone(&zones[n], &blkz[i]); 2135 if (ret != 0) { 2136 return ret; 2137 } 2138 2139 /* The next report should start after the last zone reported */ 2140 sector = blkz[i].start + blkz[i].len; 2141 } 2142 } 2143 2144 *nr_zones = n; 2145 return 0; 2146 } 2147 #endif 2148 2149 #if defined(CONFIG_BLKZONED) 2150 static int handle_aiocb_zone_mgmt(void *opaque) 2151 { 2152 RawPosixAIOData *aiocb = opaque; 2153 int fd = aiocb->aio_fildes; 2154 uint64_t sector = aiocb->aio_offset / 512; 2155 int64_t nr_sectors = aiocb->aio_nbytes / 512; 2156 struct blk_zone_range range; 2157 int ret; 2158 2159 /* Execute the operation */ 2160 range.sector = sector; 2161 range.nr_sectors = nr_sectors; 2162 do { 2163 ret = ioctl(fd, aiocb->zone_mgmt.op, &range); 2164 } while (ret != 0 && errno == EINTR); 2165 2166 return ret < 0 ? -errno : ret; 2167 } 2168 #endif 2169 2170 static int handle_aiocb_copy_range(void *opaque) 2171 { 2172 RawPosixAIOData *aiocb = opaque; 2173 uint64_t bytes = aiocb->aio_nbytes; 2174 off_t in_off = aiocb->aio_offset; 2175 off_t out_off = aiocb->copy_range.aio_offset2; 2176 2177 while (bytes) { 2178 ssize_t ret = copy_file_range(aiocb->aio_fildes, &in_off, 2179 aiocb->copy_range.aio_fd2, &out_off, 2180 bytes, 0); 2181 trace_file_copy_file_range(aiocb->bs, aiocb->aio_fildes, in_off, 2182 aiocb->copy_range.aio_fd2, out_off, bytes, 2183 0, ret); 2184 if (ret == 0) { 2185 /* No progress (e.g. when beyond EOF), let the caller fall back to 2186 * buffer I/O. */ 2187 return -ENOSPC; 2188 } 2189 if (ret < 0) { 2190 switch (errno) { 2191 case ENOSYS: 2192 return -ENOTSUP; 2193 case EINTR: 2194 continue; 2195 default: 2196 return -errno; 2197 } 2198 } 2199 bytes -= ret; 2200 } 2201 return 0; 2202 } 2203 2204 static int handle_aiocb_discard(void *opaque) 2205 { 2206 RawPosixAIOData *aiocb = opaque; 2207 int ret = -ENOTSUP; 2208 BDRVRawState *s = aiocb->bs->opaque; 2209 2210 if (!s->has_discard) { 2211 return -ENOTSUP; 2212 } 2213 2214 if (aiocb->aio_type & QEMU_AIO_BLKDEV) { 2215 #ifdef BLKDISCARD 2216 do { 2217 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes }; 2218 if (ioctl(aiocb->aio_fildes, BLKDISCARD, range) == 0) { 2219 return 0; 2220 } 2221 } while (errno == EINTR); 2222 2223 ret = translate_err(-errno); 2224 #endif 2225 } else { 2226 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE 2227 ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 2228 aiocb->aio_offset, aiocb->aio_nbytes); 2229 ret = translate_err(ret); 2230 #elif defined(__APPLE__) && (__MACH__) 2231 fpunchhole_t fpunchhole; 2232 fpunchhole.fp_flags = 0; 2233 fpunchhole.reserved = 0; 2234 fpunchhole.fp_offset = aiocb->aio_offset; 2235 fpunchhole.fp_length = aiocb->aio_nbytes; 2236 if (fcntl(s->fd, F_PUNCHHOLE, &fpunchhole) == -1) { 2237 ret = errno == ENODEV ? -ENOTSUP : -errno; 2238 } else { 2239 ret = 0; 2240 } 2241 #endif 2242 } 2243 2244 if (ret == -ENOTSUP) { 2245 s->has_discard = false; 2246 } 2247 return ret; 2248 } 2249 2250 /* 2251 * Help alignment probing by allocating the first block. 2252 * 2253 * When reading with direct I/O from unallocated area on Gluster backed by XFS, 2254 * reading succeeds regardless of request length. In this case we fallback to 2255 * safe alignment which is not optimal. Allocating the first block avoids this 2256 * fallback. 2257 * 2258 * fd may be opened with O_DIRECT, but we don't know the buffer alignment or 2259 * request alignment, so we use safe values. 2260 * 2261 * Returns: 0 on success, -errno on failure. Since this is an optimization, 2262 * caller may ignore failures. 2263 */ 2264 static int allocate_first_block(int fd, size_t max_size) 2265 { 2266 size_t write_size = (max_size < MAX_BLOCKSIZE) 2267 ? BDRV_SECTOR_SIZE 2268 : MAX_BLOCKSIZE; 2269 size_t max_align = MAX(MAX_BLOCKSIZE, qemu_real_host_page_size()); 2270 void *buf; 2271 ssize_t n; 2272 int ret; 2273 2274 buf = qemu_memalign(max_align, write_size); 2275 memset(buf, 0, write_size); 2276 2277 n = RETRY_ON_EINTR(pwrite(fd, buf, write_size, 0)); 2278 2279 ret = (n == -1) ? -errno : 0; 2280 2281 qemu_vfree(buf); 2282 return ret; 2283 } 2284 2285 static int handle_aiocb_truncate(void *opaque) 2286 { 2287 RawPosixAIOData *aiocb = opaque; 2288 int result = 0; 2289 int64_t current_length = 0; 2290 char *buf = NULL; 2291 struct stat st; 2292 int fd = aiocb->aio_fildes; 2293 int64_t offset = aiocb->aio_offset; 2294 PreallocMode prealloc = aiocb->truncate.prealloc; 2295 Error **errp = aiocb->truncate.errp; 2296 2297 if (fstat(fd, &st) < 0) { 2298 result = -errno; 2299 error_setg_errno(errp, -result, "Could not stat file"); 2300 return result; 2301 } 2302 2303 current_length = st.st_size; 2304 if (current_length > offset && prealloc != PREALLOC_MODE_OFF) { 2305 error_setg(errp, "Cannot use preallocation for shrinking files"); 2306 return -ENOTSUP; 2307 } 2308 2309 switch (prealloc) { 2310 #ifdef CONFIG_POSIX_FALLOCATE 2311 case PREALLOC_MODE_FALLOC: 2312 /* 2313 * Truncating before posix_fallocate() makes it about twice slower on 2314 * file systems that do not support fallocate(), trying to check if a 2315 * block is allocated before allocating it, so don't do that here. 2316 */ 2317 if (offset != current_length) { 2318 result = -posix_fallocate(fd, current_length, 2319 offset - current_length); 2320 if (result != 0) { 2321 /* posix_fallocate() doesn't set errno. */ 2322 error_setg_errno(errp, -result, 2323 "Could not preallocate new data"); 2324 } else if (current_length == 0) { 2325 /* 2326 * posix_fallocate() uses fallocate() if the filesystem 2327 * supports it, or fallback to manually writing zeroes. If 2328 * fallocate() was used, unaligned reads from the fallocated 2329 * area in raw_probe_alignment() will succeed, hence we need to 2330 * allocate the first block. 2331 * 2332 * Optimize future alignment probing; ignore failures. 2333 */ 2334 allocate_first_block(fd, offset); 2335 } 2336 } else { 2337 result = 0; 2338 } 2339 goto out; 2340 #endif 2341 case PREALLOC_MODE_FULL: 2342 { 2343 int64_t num = 0, left = offset - current_length; 2344 off_t seek_result; 2345 2346 /* 2347 * Knowing the final size from the beginning could allow the file 2348 * system driver to do less allocations and possibly avoid 2349 * fragmentation of the file. 2350 */ 2351 if (ftruncate(fd, offset) != 0) { 2352 result = -errno; 2353 error_setg_errno(errp, -result, "Could not resize file"); 2354 goto out; 2355 } 2356 2357 buf = g_malloc0(65536); 2358 2359 seek_result = lseek(fd, current_length, SEEK_SET); 2360 if (seek_result < 0) { 2361 result = -errno; 2362 error_setg_errno(errp, -result, 2363 "Failed to seek to the old end of file"); 2364 goto out; 2365 } 2366 2367 while (left > 0) { 2368 num = MIN(left, 65536); 2369 result = write(fd, buf, num); 2370 if (result < 0) { 2371 if (errno == EINTR) { 2372 continue; 2373 } 2374 result = -errno; 2375 error_setg_errno(errp, -result, 2376 "Could not write zeros for preallocation"); 2377 goto out; 2378 } 2379 left -= result; 2380 } 2381 if (result >= 0) { 2382 result = fsync(fd); 2383 if (result < 0) { 2384 result = -errno; 2385 error_setg_errno(errp, -result, 2386 "Could not flush file to disk"); 2387 goto out; 2388 } 2389 } 2390 goto out; 2391 } 2392 case PREALLOC_MODE_OFF: 2393 if (ftruncate(fd, offset) != 0) { 2394 result = -errno; 2395 error_setg_errno(errp, -result, "Could not resize file"); 2396 } else if (current_length == 0 && offset > current_length) { 2397 /* Optimize future alignment probing; ignore failures. */ 2398 allocate_first_block(fd, offset); 2399 } 2400 return result; 2401 default: 2402 result = -ENOTSUP; 2403 error_setg(errp, "Unsupported preallocation mode: %s", 2404 PreallocMode_str(prealloc)); 2405 return result; 2406 } 2407 2408 out: 2409 if (result < 0) { 2410 if (ftruncate(fd, current_length) < 0) { 2411 error_report("Failed to restore old file length: %s", 2412 strerror(errno)); 2413 } 2414 } 2415 2416 g_free(buf); 2417 return result; 2418 } 2419 2420 static int coroutine_fn raw_thread_pool_submit(ThreadPoolFunc func, void *arg) 2421 { 2422 return thread_pool_submit_co(func, arg); 2423 } 2424 2425 /* 2426 * Check if all memory in this vector is sector aligned. 2427 */ 2428 static bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) 2429 { 2430 int i; 2431 size_t alignment = bdrv_min_mem_align(bs); 2432 size_t len = bs->bl.request_alignment; 2433 IO_CODE(); 2434 2435 for (i = 0; i < qiov->niov; i++) { 2436 if ((uintptr_t) qiov->iov[i].iov_base % alignment) { 2437 return false; 2438 } 2439 if (qiov->iov[i].iov_len % len) { 2440 return false; 2441 } 2442 } 2443 2444 return true; 2445 } 2446 2447 static int coroutine_fn raw_co_prw(BlockDriverState *bs, uint64_t offset, 2448 uint64_t bytes, QEMUIOVector *qiov, int type) 2449 { 2450 BDRVRawState *s = bs->opaque; 2451 RawPosixAIOData acb; 2452 int ret; 2453 2454 if (fd_open(bs) < 0) 2455 return -EIO; 2456 #if defined(CONFIG_BLKZONED) 2457 if ((type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) && bs->wps) { 2458 qemu_co_mutex_lock(&bs->wps->colock); 2459 if (type & QEMU_AIO_ZONE_APPEND && bs->bl.zone_size) { 2460 int index = offset / bs->bl.zone_size; 2461 offset = bs->wps->wp[index]; 2462 } 2463 } 2464 #endif 2465 2466 /* 2467 * When using O_DIRECT, the request must be aligned to be able to use 2468 * either libaio or io_uring interface. If not fail back to regular thread 2469 * pool read/write code which emulates this for us if we 2470 * set QEMU_AIO_MISALIGNED. 2471 */ 2472 if (s->needs_alignment && !bdrv_qiov_is_aligned(bs, qiov)) { 2473 type |= QEMU_AIO_MISALIGNED; 2474 #ifdef CONFIG_LINUX_IO_URING 2475 } else if (s->use_linux_io_uring) { 2476 assert(qiov->size == bytes); 2477 ret = luring_co_submit(bs, s->fd, offset, qiov, type); 2478 goto out; 2479 #endif 2480 #ifdef CONFIG_LINUX_AIO 2481 } else if (s->use_linux_aio) { 2482 assert(qiov->size == bytes); 2483 ret = laio_co_submit(s->fd, offset, qiov, type, 2484 s->aio_max_batch); 2485 goto out; 2486 #endif 2487 } 2488 2489 acb = (RawPosixAIOData) { 2490 .bs = bs, 2491 .aio_fildes = s->fd, 2492 .aio_type = type, 2493 .aio_offset = offset, 2494 .aio_nbytes = bytes, 2495 .io = { 2496 .iov = qiov->iov, 2497 .niov = qiov->niov, 2498 }, 2499 }; 2500 2501 assert(qiov->size == bytes); 2502 ret = raw_thread_pool_submit(handle_aiocb_rw, &acb); 2503 goto out; /* Avoid the compiler err of unused label */ 2504 2505 out: 2506 #if defined(CONFIG_BLKZONED) 2507 { 2508 BlockZoneWps *wps = bs->wps; 2509 if (ret == 0) { 2510 if ((type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) 2511 && wps && bs->bl.zone_size) { 2512 uint64_t *wp = &wps->wp[offset / bs->bl.zone_size]; 2513 if (!BDRV_ZT_IS_CONV(*wp)) { 2514 if (type & QEMU_AIO_ZONE_APPEND) { 2515 *s->offset = *wp; 2516 trace_zbd_zone_append_complete(bs, *s->offset 2517 >> BDRV_SECTOR_BITS); 2518 } 2519 /* Advance the wp if needed */ 2520 if (offset + bytes > *wp) { 2521 *wp = offset + bytes; 2522 } 2523 } 2524 } 2525 } else { 2526 if (type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) { 2527 update_zones_wp(bs, s->fd, 0, 1); 2528 } 2529 } 2530 2531 if ((type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) && wps) { 2532 qemu_co_mutex_unlock(&wps->colock); 2533 } 2534 } 2535 #endif 2536 return ret; 2537 } 2538 2539 static int coroutine_fn raw_co_preadv(BlockDriverState *bs, int64_t offset, 2540 int64_t bytes, QEMUIOVector *qiov, 2541 BdrvRequestFlags flags) 2542 { 2543 return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_READ); 2544 } 2545 2546 static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, int64_t offset, 2547 int64_t bytes, QEMUIOVector *qiov, 2548 BdrvRequestFlags flags) 2549 { 2550 return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_WRITE); 2551 } 2552 2553 static int coroutine_fn raw_co_flush_to_disk(BlockDriverState *bs) 2554 { 2555 BDRVRawState *s = bs->opaque; 2556 RawPosixAIOData acb; 2557 int ret; 2558 2559 ret = fd_open(bs); 2560 if (ret < 0) { 2561 return ret; 2562 } 2563 2564 acb = (RawPosixAIOData) { 2565 .bs = bs, 2566 .aio_fildes = s->fd, 2567 .aio_type = QEMU_AIO_FLUSH, 2568 }; 2569 2570 #ifdef CONFIG_LINUX_IO_URING 2571 if (s->use_linux_io_uring) { 2572 return luring_co_submit(bs, s->fd, 0, NULL, QEMU_AIO_FLUSH); 2573 } 2574 #endif 2575 return raw_thread_pool_submit(handle_aiocb_flush, &acb); 2576 } 2577 2578 static void raw_aio_attach_aio_context(BlockDriverState *bs, 2579 AioContext *new_context) 2580 { 2581 BDRVRawState __attribute__((unused)) *s = bs->opaque; 2582 #ifdef CONFIG_LINUX_AIO 2583 if (s->use_linux_aio) { 2584 Error *local_err = NULL; 2585 if (!aio_setup_linux_aio(new_context, &local_err)) { 2586 error_reportf_err(local_err, "Unable to use native AIO, " 2587 "falling back to thread pool: "); 2588 s->use_linux_aio = false; 2589 } 2590 } 2591 #endif 2592 #ifdef CONFIG_LINUX_IO_URING 2593 if (s->use_linux_io_uring) { 2594 Error *local_err = NULL; 2595 if (!aio_setup_linux_io_uring(new_context, &local_err)) { 2596 error_reportf_err(local_err, "Unable to use linux io_uring, " 2597 "falling back to thread pool: "); 2598 s->use_linux_io_uring = false; 2599 } 2600 } 2601 #endif 2602 } 2603 2604 static void raw_close(BlockDriverState *bs) 2605 { 2606 BDRVRawState *s = bs->opaque; 2607 2608 if (s->fd >= 0) { 2609 #if defined(CONFIG_BLKZONED) 2610 g_free(bs->wps); 2611 #endif 2612 qemu_close(s->fd); 2613 s->fd = -1; 2614 } 2615 } 2616 2617 /** 2618 * Truncates the given regular file @fd to @offset and, when growing, fills the 2619 * new space according to @prealloc. 2620 * 2621 * Returns: 0 on success, -errno on failure. 2622 */ 2623 static int coroutine_fn 2624 raw_regular_truncate(BlockDriverState *bs, int fd, int64_t offset, 2625 PreallocMode prealloc, Error **errp) 2626 { 2627 RawPosixAIOData acb; 2628 2629 acb = (RawPosixAIOData) { 2630 .bs = bs, 2631 .aio_fildes = fd, 2632 .aio_type = QEMU_AIO_TRUNCATE, 2633 .aio_offset = offset, 2634 .truncate = { 2635 .prealloc = prealloc, 2636 .errp = errp, 2637 }, 2638 }; 2639 2640 return raw_thread_pool_submit(handle_aiocb_truncate, &acb); 2641 } 2642 2643 static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset, 2644 bool exact, PreallocMode prealloc, 2645 BdrvRequestFlags flags, Error **errp) 2646 { 2647 BDRVRawState *s = bs->opaque; 2648 struct stat st; 2649 int ret; 2650 2651 if (fstat(s->fd, &st)) { 2652 ret = -errno; 2653 error_setg_errno(errp, -ret, "Failed to fstat() the file"); 2654 return ret; 2655 } 2656 2657 if (S_ISREG(st.st_mode)) { 2658 /* Always resizes to the exact @offset */ 2659 return raw_regular_truncate(bs, s->fd, offset, prealloc, errp); 2660 } 2661 2662 if (prealloc != PREALLOC_MODE_OFF) { 2663 error_setg(errp, "Preallocation mode '%s' unsupported for this " 2664 "non-regular file", PreallocMode_str(prealloc)); 2665 return -ENOTSUP; 2666 } 2667 2668 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { 2669 int64_t cur_length = raw_co_getlength(bs); 2670 2671 if (offset != cur_length && exact) { 2672 error_setg(errp, "Cannot resize device files"); 2673 return -ENOTSUP; 2674 } else if (offset > cur_length) { 2675 error_setg(errp, "Cannot grow device files"); 2676 return -EINVAL; 2677 } 2678 } else { 2679 error_setg(errp, "Resizing this file is not supported"); 2680 return -ENOTSUP; 2681 } 2682 2683 return 0; 2684 } 2685 2686 #ifdef __OpenBSD__ 2687 static int64_t coroutine_fn raw_co_getlength(BlockDriverState *bs) 2688 { 2689 BDRVRawState *s = bs->opaque; 2690 int fd = s->fd; 2691 struct stat st; 2692 2693 if (fstat(fd, &st)) 2694 return -errno; 2695 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { 2696 struct disklabel dl; 2697 2698 if (ioctl(fd, DIOCGDINFO, &dl)) 2699 return -errno; 2700 return (uint64_t)dl.d_secsize * 2701 dl.d_partitions[DISKPART(st.st_rdev)].p_size; 2702 } else 2703 return st.st_size; 2704 } 2705 #elif defined(__NetBSD__) 2706 static int64_t coroutine_fn raw_co_getlength(BlockDriverState *bs) 2707 { 2708 BDRVRawState *s = bs->opaque; 2709 int fd = s->fd; 2710 struct stat st; 2711 2712 if (fstat(fd, &st)) 2713 return -errno; 2714 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { 2715 struct dkwedge_info dkw; 2716 2717 if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) { 2718 return dkw.dkw_size * 512; 2719 } else { 2720 struct disklabel dl; 2721 2722 if (ioctl(fd, DIOCGDINFO, &dl)) 2723 return -errno; 2724 return (uint64_t)dl.d_secsize * 2725 dl.d_partitions[DISKPART(st.st_rdev)].p_size; 2726 } 2727 } else 2728 return st.st_size; 2729 } 2730 #elif defined(__sun__) 2731 static int64_t coroutine_fn raw_co_getlength(BlockDriverState *bs) 2732 { 2733 BDRVRawState *s = bs->opaque; 2734 struct dk_minfo minfo; 2735 int ret; 2736 int64_t size; 2737 2738 ret = fd_open(bs); 2739 if (ret < 0) { 2740 return ret; 2741 } 2742 2743 /* 2744 * Use the DKIOCGMEDIAINFO ioctl to read the size. 2745 */ 2746 ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo); 2747 if (ret != -1) { 2748 return minfo.dki_lbsize * minfo.dki_capacity; 2749 } 2750 2751 /* 2752 * There are reports that lseek on some devices fails, but 2753 * irc discussion said that contingency on contingency was overkill. 2754 */ 2755 size = lseek(s->fd, 0, SEEK_END); 2756 if (size < 0) { 2757 return -errno; 2758 } 2759 return size; 2760 } 2761 #elif defined(CONFIG_BSD) 2762 static int64_t coroutine_fn raw_co_getlength(BlockDriverState *bs) 2763 { 2764 BDRVRawState *s = bs->opaque; 2765 int fd = s->fd; 2766 int64_t size; 2767 struct stat sb; 2768 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) 2769 int reopened = 0; 2770 #endif 2771 int ret; 2772 2773 ret = fd_open(bs); 2774 if (ret < 0) 2775 return ret; 2776 2777 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) 2778 again: 2779 #endif 2780 if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) { 2781 size = 0; 2782 #ifdef DIOCGMEDIASIZE 2783 if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size)) { 2784 size = 0; 2785 } 2786 #endif 2787 #ifdef DIOCGPART 2788 if (size == 0) { 2789 struct partinfo pi; 2790 if (ioctl(fd, DIOCGPART, &pi) == 0) { 2791 size = pi.media_size; 2792 } 2793 } 2794 #endif 2795 #if defined(DKIOCGETBLOCKCOUNT) && defined(DKIOCGETBLOCKSIZE) 2796 if (size == 0) { 2797 uint64_t sectors = 0; 2798 uint32_t sector_size = 0; 2799 2800 if (ioctl(fd, DKIOCGETBLOCKCOUNT, §ors) == 0 2801 && ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) == 0) { 2802 size = sectors * sector_size; 2803 } 2804 } 2805 #endif 2806 if (size == 0) { 2807 size = lseek(fd, 0LL, SEEK_END); 2808 } 2809 if (size < 0) { 2810 return -errno; 2811 } 2812 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 2813 switch(s->type) { 2814 case FTYPE_CD: 2815 /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */ 2816 if (size == 2048LL * (unsigned)-1) 2817 size = 0; 2818 /* XXX no disc? maybe we need to reopen... */ 2819 if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) { 2820 reopened = 1; 2821 goto again; 2822 } 2823 } 2824 #endif 2825 } else { 2826 size = lseek(fd, 0, SEEK_END); 2827 if (size < 0) { 2828 return -errno; 2829 } 2830 } 2831 return size; 2832 } 2833 #else 2834 static int64_t coroutine_fn raw_co_getlength(BlockDriverState *bs) 2835 { 2836 BDRVRawState *s = bs->opaque; 2837 int ret; 2838 int64_t size; 2839 2840 ret = fd_open(bs); 2841 if (ret < 0) { 2842 return ret; 2843 } 2844 2845 size = lseek(s->fd, 0, SEEK_END); 2846 if (size < 0) { 2847 return -errno; 2848 } 2849 return size; 2850 } 2851 #endif 2852 2853 static int64_t coroutine_fn raw_co_get_allocated_file_size(BlockDriverState *bs) 2854 { 2855 struct stat st; 2856 BDRVRawState *s = bs->opaque; 2857 2858 if (fstat(s->fd, &st) < 0) { 2859 return -errno; 2860 } 2861 return (int64_t)st.st_blocks * 512; 2862 } 2863 2864 static int coroutine_fn 2865 raw_co_create(BlockdevCreateOptions *options, Error **errp) 2866 { 2867 BlockdevCreateOptionsFile *file_opts; 2868 Error *local_err = NULL; 2869 int fd; 2870 uint64_t perm, shared; 2871 int result = 0; 2872 2873 /* Validate options and set default values */ 2874 assert(options->driver == BLOCKDEV_DRIVER_FILE); 2875 file_opts = &options->u.file; 2876 2877 if (!file_opts->has_nocow) { 2878 file_opts->nocow = false; 2879 } 2880 if (!file_opts->has_preallocation) { 2881 file_opts->preallocation = PREALLOC_MODE_OFF; 2882 } 2883 if (!file_opts->has_extent_size_hint) { 2884 file_opts->extent_size_hint = 1 * MiB; 2885 } 2886 if (file_opts->extent_size_hint > UINT32_MAX) { 2887 result = -EINVAL; 2888 error_setg(errp, "Extent size hint is too large"); 2889 goto out; 2890 } 2891 2892 /* Create file */ 2893 fd = qemu_create(file_opts->filename, O_RDWR | O_BINARY, 0644, errp); 2894 if (fd < 0) { 2895 result = -errno; 2896 goto out; 2897 } 2898 2899 /* Take permissions: We want to discard everything, so we need 2900 * BLK_PERM_WRITE; and truncation to the desired size requires 2901 * BLK_PERM_RESIZE. 2902 * On the other hand, we cannot share the RESIZE permission 2903 * because we promise that after this function, the file has the 2904 * size given in the options. If someone else were to resize it 2905 * concurrently, we could not guarantee that. 2906 * Note that after this function, we can no longer guarantee that 2907 * the file is not touched by a third party, so it may be resized 2908 * then. */ 2909 perm = BLK_PERM_WRITE | BLK_PERM_RESIZE; 2910 shared = BLK_PERM_ALL & ~BLK_PERM_RESIZE; 2911 2912 /* Step one: Take locks */ 2913 result = raw_apply_lock_bytes(NULL, fd, perm, ~shared, false, errp); 2914 if (result < 0) { 2915 goto out_close; 2916 } 2917 2918 /* Step two: Check that nobody else has taken conflicting locks */ 2919 result = raw_check_lock_bytes(fd, perm, shared, errp); 2920 if (result < 0) { 2921 error_append_hint(errp, 2922 "Is another process using the image [%s]?\n", 2923 file_opts->filename); 2924 goto out_unlock; 2925 } 2926 2927 /* Clear the file by truncating it to 0 */ 2928 result = raw_regular_truncate(NULL, fd, 0, PREALLOC_MODE_OFF, errp); 2929 if (result < 0) { 2930 goto out_unlock; 2931 } 2932 2933 if (file_opts->nocow) { 2934 #ifdef __linux__ 2935 /* Set NOCOW flag to solve performance issue on fs like btrfs. 2936 * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value 2937 * will be ignored since any failure of this operation should not 2938 * block the left work. 2939 */ 2940 int attr; 2941 if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) { 2942 attr |= FS_NOCOW_FL; 2943 ioctl(fd, FS_IOC_SETFLAGS, &attr); 2944 } 2945 #endif 2946 } 2947 #ifdef FS_IOC_FSSETXATTR 2948 /* 2949 * Try to set the extent size hint. Failure is not fatal, and a warning is 2950 * only printed if the option was explicitly specified. 2951 */ 2952 { 2953 struct fsxattr attr; 2954 result = ioctl(fd, FS_IOC_FSGETXATTR, &attr); 2955 if (result == 0) { 2956 attr.fsx_xflags |= FS_XFLAG_EXTSIZE; 2957 attr.fsx_extsize = file_opts->extent_size_hint; 2958 result = ioctl(fd, FS_IOC_FSSETXATTR, &attr); 2959 } 2960 if (result < 0 && file_opts->has_extent_size_hint && 2961 file_opts->extent_size_hint) 2962 { 2963 warn_report("Failed to set extent size hint: %s", 2964 strerror(errno)); 2965 } 2966 } 2967 #endif 2968 2969 /* Resize and potentially preallocate the file to the desired 2970 * final size */ 2971 result = raw_regular_truncate(NULL, fd, file_opts->size, 2972 file_opts->preallocation, errp); 2973 if (result < 0) { 2974 goto out_unlock; 2975 } 2976 2977 out_unlock: 2978 raw_apply_lock_bytes(NULL, fd, 0, 0, true, &local_err); 2979 if (local_err) { 2980 /* The above call should not fail, and if it does, that does 2981 * not mean the whole creation operation has failed. So 2982 * report it the user for their convenience, but do not report 2983 * it to the caller. */ 2984 warn_report_err(local_err); 2985 } 2986 2987 out_close: 2988 if (qemu_close(fd) != 0 && result == 0) { 2989 result = -errno; 2990 error_setg_errno(errp, -result, "Could not close the new file"); 2991 } 2992 out: 2993 return result; 2994 } 2995 2996 static int coroutine_fn GRAPH_RDLOCK 2997 raw_co_create_opts(BlockDriver *drv, const char *filename, 2998 QemuOpts *opts, Error **errp) 2999 { 3000 BlockdevCreateOptions options; 3001 int64_t total_size = 0; 3002 int64_t extent_size_hint = 0; 3003 bool has_extent_size_hint = false; 3004 bool nocow = false; 3005 PreallocMode prealloc; 3006 char *buf = NULL; 3007 Error *local_err = NULL; 3008 3009 /* Skip file: protocol prefix */ 3010 strstart(filename, "file:", &filename); 3011 3012 /* Read out options */ 3013 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 3014 BDRV_SECTOR_SIZE); 3015 if (qemu_opt_get(opts, BLOCK_OPT_EXTENT_SIZE_HINT)) { 3016 has_extent_size_hint = true; 3017 extent_size_hint = 3018 qemu_opt_get_size_del(opts, BLOCK_OPT_EXTENT_SIZE_HINT, -1); 3019 } 3020 nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false); 3021 buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); 3022 prealloc = qapi_enum_parse(&PreallocMode_lookup, buf, 3023 PREALLOC_MODE_OFF, &local_err); 3024 g_free(buf); 3025 if (local_err) { 3026 error_propagate(errp, local_err); 3027 return -EINVAL; 3028 } 3029 3030 options = (BlockdevCreateOptions) { 3031 .driver = BLOCKDEV_DRIVER_FILE, 3032 .u.file = { 3033 .filename = (char *) filename, 3034 .size = total_size, 3035 .has_preallocation = true, 3036 .preallocation = prealloc, 3037 .has_nocow = true, 3038 .nocow = nocow, 3039 .has_extent_size_hint = has_extent_size_hint, 3040 .extent_size_hint = extent_size_hint, 3041 }, 3042 }; 3043 return raw_co_create(&options, errp); 3044 } 3045 3046 static int coroutine_fn raw_co_delete_file(BlockDriverState *bs, 3047 Error **errp) 3048 { 3049 struct stat st; 3050 int ret; 3051 3052 if (!(stat(bs->filename, &st) == 0) || !S_ISREG(st.st_mode)) { 3053 error_setg_errno(errp, ENOENT, "%s is not a regular file", 3054 bs->filename); 3055 return -ENOENT; 3056 } 3057 3058 ret = unlink(bs->filename); 3059 if (ret < 0) { 3060 ret = -errno; 3061 error_setg_errno(errp, -ret, "Error when deleting file %s", 3062 bs->filename); 3063 } 3064 3065 return ret; 3066 } 3067 3068 /* 3069 * Find allocation range in @bs around offset @start. 3070 * May change underlying file descriptor's file offset. 3071 * If @start is not in a hole, store @start in @data, and the 3072 * beginning of the next hole in @hole, and return 0. 3073 * If @start is in a non-trailing hole, store @start in @hole and the 3074 * beginning of the next non-hole in @data, and return 0. 3075 * If @start is in a trailing hole or beyond EOF, return -ENXIO. 3076 * If we can't find out, return a negative errno other than -ENXIO. 3077 */ 3078 static int find_allocation(BlockDriverState *bs, off_t start, 3079 off_t *data, off_t *hole) 3080 { 3081 #if defined SEEK_HOLE && defined SEEK_DATA 3082 BDRVRawState *s = bs->opaque; 3083 off_t offs; 3084 3085 /* 3086 * SEEK_DATA cases: 3087 * D1. offs == start: start is in data 3088 * D2. offs > start: start is in a hole, next data at offs 3089 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole 3090 * or start is beyond EOF 3091 * If the latter happens, the file has been truncated behind 3092 * our back since we opened it. All bets are off then. 3093 * Treating like a trailing hole is simplest. 3094 * D4. offs < 0, errno != ENXIO: we learned nothing 3095 */ 3096 offs = lseek(s->fd, start, SEEK_DATA); 3097 if (offs < 0) { 3098 return -errno; /* D3 or D4 */ 3099 } 3100 3101 if (offs < start) { 3102 /* This is not a valid return by lseek(). We are safe to just return 3103 * -EIO in this case, and we'll treat it like D4. */ 3104 return -EIO; 3105 } 3106 3107 if (offs > start) { 3108 /* D2: in hole, next data at offs */ 3109 *hole = start; 3110 *data = offs; 3111 return 0; 3112 } 3113 3114 /* D1: in data, end not yet known */ 3115 3116 /* 3117 * SEEK_HOLE cases: 3118 * H1. offs == start: start is in a hole 3119 * If this happens here, a hole has been dug behind our back 3120 * since the previous lseek(). 3121 * H2. offs > start: either start is in data, next hole at offs, 3122 * or start is in trailing hole, EOF at offs 3123 * Linux treats trailing holes like any other hole: offs == 3124 * start. Solaris seeks to EOF instead: offs > start (blech). 3125 * If that happens here, a hole has been dug behind our back 3126 * since the previous lseek(). 3127 * H3. offs < 0, errno = ENXIO: start is beyond EOF 3128 * If this happens, the file has been truncated behind our 3129 * back since we opened it. Treat it like a trailing hole. 3130 * H4. offs < 0, errno != ENXIO: we learned nothing 3131 * Pretend we know nothing at all, i.e. "forget" about D1. 3132 */ 3133 offs = lseek(s->fd, start, SEEK_HOLE); 3134 if (offs < 0) { 3135 return -errno; /* D1 and (H3 or H4) */ 3136 } 3137 3138 if (offs < start) { 3139 /* This is not a valid return by lseek(). We are safe to just return 3140 * -EIO in this case, and we'll treat it like H4. */ 3141 return -EIO; 3142 } 3143 3144 if (offs > start) { 3145 /* 3146 * D1 and H2: either in data, next hole at offs, or it was in 3147 * data but is now in a trailing hole. In the latter case, 3148 * all bets are off. Treating it as if it there was data all 3149 * the way to EOF is safe, so simply do that. 3150 */ 3151 *data = start; 3152 *hole = offs; 3153 return 0; 3154 } 3155 3156 /* D1 and H1 */ 3157 return -EBUSY; 3158 #else 3159 return -ENOTSUP; 3160 #endif 3161 } 3162 3163 /* 3164 * Returns the allocation status of the specified offset. 3165 * 3166 * The block layer guarantees 'offset' and 'bytes' are within bounds. 3167 * 3168 * 'pnum' is set to the number of bytes (including and immediately following 3169 * the specified offset) that are known to be in the same 3170 * allocated/unallocated state. 3171 * 3172 * 'bytes' is a soft cap for 'pnum'. If the information is free, 'pnum' may 3173 * well exceed it. 3174 */ 3175 static int coroutine_fn raw_co_block_status(BlockDriverState *bs, 3176 bool want_zero, 3177 int64_t offset, 3178 int64_t bytes, int64_t *pnum, 3179 int64_t *map, 3180 BlockDriverState **file) 3181 { 3182 off_t data = 0, hole = 0; 3183 int ret; 3184 3185 assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment)); 3186 3187 ret = fd_open(bs); 3188 if (ret < 0) { 3189 return ret; 3190 } 3191 3192 if (!want_zero) { 3193 *pnum = bytes; 3194 *map = offset; 3195 *file = bs; 3196 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 3197 } 3198 3199 ret = find_allocation(bs, offset, &data, &hole); 3200 if (ret == -ENXIO) { 3201 /* Trailing hole */ 3202 *pnum = bytes; 3203 ret = BDRV_BLOCK_ZERO; 3204 } else if (ret < 0) { 3205 /* No info available, so pretend there are no holes */ 3206 *pnum = bytes; 3207 ret = BDRV_BLOCK_DATA; 3208 } else if (data == offset) { 3209 /* On a data extent, compute bytes to the end of the extent, 3210 * possibly including a partial sector at EOF. */ 3211 *pnum = hole - offset; 3212 3213 /* 3214 * We are not allowed to return partial sectors, though, so 3215 * round up if necessary. 3216 */ 3217 if (!QEMU_IS_ALIGNED(*pnum, bs->bl.request_alignment)) { 3218 int64_t file_length = raw_co_getlength(bs); 3219 if (file_length > 0) { 3220 /* Ignore errors, this is just a safeguard */ 3221 assert(hole == file_length); 3222 } 3223 *pnum = ROUND_UP(*pnum, bs->bl.request_alignment); 3224 } 3225 3226 ret = BDRV_BLOCK_DATA; 3227 } else { 3228 /* On a hole, compute bytes to the beginning of the next extent. */ 3229 assert(hole == offset); 3230 *pnum = data - offset; 3231 ret = BDRV_BLOCK_ZERO; 3232 } 3233 *map = offset; 3234 *file = bs; 3235 return ret | BDRV_BLOCK_OFFSET_VALID; 3236 } 3237 3238 #if defined(__linux__) 3239 /* Verify that the file is not in the page cache */ 3240 static void coroutine_fn check_cache_dropped(BlockDriverState *bs, Error **errp) 3241 { 3242 const size_t window_size = 128 * 1024 * 1024; 3243 BDRVRawState *s = bs->opaque; 3244 void *window = NULL; 3245 size_t length = 0; 3246 unsigned char *vec; 3247 size_t page_size; 3248 off_t offset; 3249 off_t end; 3250 3251 /* mincore(2) page status information requires 1 byte per page */ 3252 page_size = sysconf(_SC_PAGESIZE); 3253 vec = g_malloc(DIV_ROUND_UP(window_size, page_size)); 3254 3255 end = raw_co_getlength(bs); 3256 3257 for (offset = 0; offset < end; offset += window_size) { 3258 void *new_window; 3259 size_t new_length; 3260 size_t vec_end; 3261 size_t i; 3262 int ret; 3263 3264 /* Unmap previous window if size has changed */ 3265 new_length = MIN(end - offset, window_size); 3266 if (new_length != length) { 3267 munmap(window, length); 3268 window = NULL; 3269 length = 0; 3270 } 3271 3272 new_window = mmap(window, new_length, PROT_NONE, MAP_PRIVATE, 3273 s->fd, offset); 3274 if (new_window == MAP_FAILED) { 3275 error_setg_errno(errp, errno, "mmap failed"); 3276 break; 3277 } 3278 3279 window = new_window; 3280 length = new_length; 3281 3282 ret = mincore(window, length, vec); 3283 if (ret < 0) { 3284 error_setg_errno(errp, errno, "mincore failed"); 3285 break; 3286 } 3287 3288 vec_end = DIV_ROUND_UP(length, page_size); 3289 for (i = 0; i < vec_end; i++) { 3290 if (vec[i] & 0x1) { 3291 break; 3292 } 3293 } 3294 if (i < vec_end) { 3295 error_setg(errp, "page cache still in use!"); 3296 break; 3297 } 3298 } 3299 3300 if (window) { 3301 munmap(window, length); 3302 } 3303 3304 g_free(vec); 3305 } 3306 #endif /* __linux__ */ 3307 3308 static void coroutine_fn GRAPH_RDLOCK 3309 raw_co_invalidate_cache(BlockDriverState *bs, Error **errp) 3310 { 3311 BDRVRawState *s = bs->opaque; 3312 int ret; 3313 3314 ret = fd_open(bs); 3315 if (ret < 0) { 3316 error_setg_errno(errp, -ret, "The file descriptor is not open"); 3317 return; 3318 } 3319 3320 if (!s->drop_cache) { 3321 return; 3322 } 3323 3324 if (s->open_flags & O_DIRECT) { 3325 return; /* No host kernel page cache */ 3326 } 3327 3328 #if defined(__linux__) 3329 /* This sets the scene for the next syscall... */ 3330 ret = bdrv_co_flush(bs); 3331 if (ret < 0) { 3332 error_setg_errno(errp, -ret, "flush failed"); 3333 return; 3334 } 3335 3336 /* Linux does not invalidate pages that are dirty, locked, or mmapped by a 3337 * process. These limitations are okay because we just fsynced the file, 3338 * we don't use mmap, and the file should not be in use by other processes. 3339 */ 3340 ret = posix_fadvise(s->fd, 0, 0, POSIX_FADV_DONTNEED); 3341 if (ret != 0) { /* the return value is a positive errno */ 3342 error_setg_errno(errp, ret, "fadvise failed"); 3343 return; 3344 } 3345 3346 if (s->check_cache_dropped) { 3347 check_cache_dropped(bs, errp); 3348 } 3349 #else /* __linux__ */ 3350 /* Do nothing. Live migration to a remote host with cache.direct=off is 3351 * unsupported on other host operating systems. Cache consistency issues 3352 * may occur but no error is reported here, partly because that's the 3353 * historical behavior and partly because it's hard to differentiate valid 3354 * configurations that should not cause errors. 3355 */ 3356 #endif /* !__linux__ */ 3357 } 3358 3359 static void raw_account_discard(BDRVRawState *s, uint64_t nbytes, int ret) 3360 { 3361 if (ret) { 3362 s->stats.discard_nb_failed++; 3363 } else { 3364 s->stats.discard_nb_ok++; 3365 s->stats.discard_bytes_ok += nbytes; 3366 } 3367 } 3368 3369 /* 3370 * zone report - Get a zone block device's information in the form 3371 * of an array of zone descriptors. 3372 * zones is an array of zone descriptors to hold zone information on reply; 3373 * offset can be any byte within the entire size of the device; 3374 * nr_zones is the maxium number of sectors the command should operate on. 3375 */ 3376 #if defined(CONFIG_BLKZONED) 3377 static int coroutine_fn raw_co_zone_report(BlockDriverState *bs, int64_t offset, 3378 unsigned int *nr_zones, 3379 BlockZoneDescriptor *zones) { 3380 BDRVRawState *s = bs->opaque; 3381 RawPosixAIOData acb = (RawPosixAIOData) { 3382 .bs = bs, 3383 .aio_fildes = s->fd, 3384 .aio_type = QEMU_AIO_ZONE_REPORT, 3385 .aio_offset = offset, 3386 .zone_report = { 3387 .nr_zones = nr_zones, 3388 .zones = zones, 3389 }, 3390 }; 3391 3392 trace_zbd_zone_report(bs, *nr_zones, offset >> BDRV_SECTOR_BITS); 3393 return raw_thread_pool_submit(handle_aiocb_zone_report, &acb); 3394 } 3395 #endif 3396 3397 /* 3398 * zone management operations - Execute an operation on a zone 3399 */ 3400 #if defined(CONFIG_BLKZONED) 3401 static int coroutine_fn raw_co_zone_mgmt(BlockDriverState *bs, BlockZoneOp op, 3402 int64_t offset, int64_t len) { 3403 BDRVRawState *s = bs->opaque; 3404 RawPosixAIOData acb; 3405 int64_t zone_size, zone_size_mask; 3406 const char *op_name; 3407 unsigned long zo; 3408 int ret; 3409 BlockZoneWps *wps = bs->wps; 3410 int64_t capacity = bs->total_sectors << BDRV_SECTOR_BITS; 3411 3412 zone_size = bs->bl.zone_size; 3413 zone_size_mask = zone_size - 1; 3414 if (offset & zone_size_mask) { 3415 error_report("sector offset %" PRId64 " is not aligned to zone size " 3416 "%" PRId64 "", offset / 512, zone_size / 512); 3417 return -EINVAL; 3418 } 3419 3420 if (((offset + len) < capacity && len & zone_size_mask) || 3421 offset + len > capacity) { 3422 error_report("number of sectors %" PRId64 " is not aligned to zone size" 3423 " %" PRId64 "", len / 512, zone_size / 512); 3424 return -EINVAL; 3425 } 3426 3427 uint32_t i = offset / bs->bl.zone_size; 3428 uint32_t nrz = len / bs->bl.zone_size; 3429 uint64_t *wp = &wps->wp[i]; 3430 if (BDRV_ZT_IS_CONV(*wp) && len != capacity) { 3431 error_report("zone mgmt operations are not allowed for conventional zones"); 3432 return -EIO; 3433 } 3434 3435 switch (op) { 3436 case BLK_ZO_OPEN: 3437 op_name = "BLKOPENZONE"; 3438 zo = BLKOPENZONE; 3439 break; 3440 case BLK_ZO_CLOSE: 3441 op_name = "BLKCLOSEZONE"; 3442 zo = BLKCLOSEZONE; 3443 break; 3444 case BLK_ZO_FINISH: 3445 op_name = "BLKFINISHZONE"; 3446 zo = BLKFINISHZONE; 3447 break; 3448 case BLK_ZO_RESET: 3449 op_name = "BLKRESETZONE"; 3450 zo = BLKRESETZONE; 3451 break; 3452 default: 3453 error_report("Unsupported zone op: 0x%x", op); 3454 return -ENOTSUP; 3455 } 3456 3457 acb = (RawPosixAIOData) { 3458 .bs = bs, 3459 .aio_fildes = s->fd, 3460 .aio_type = QEMU_AIO_ZONE_MGMT, 3461 .aio_offset = offset, 3462 .aio_nbytes = len, 3463 .zone_mgmt = { 3464 .op = zo, 3465 }, 3466 }; 3467 3468 trace_zbd_zone_mgmt(bs, op_name, offset >> BDRV_SECTOR_BITS, 3469 len >> BDRV_SECTOR_BITS); 3470 ret = raw_thread_pool_submit(handle_aiocb_zone_mgmt, &acb); 3471 if (ret != 0) { 3472 update_zones_wp(bs, s->fd, offset, i); 3473 error_report("ioctl %s failed %d", op_name, ret); 3474 return ret; 3475 } 3476 3477 if (zo == BLKRESETZONE && len == capacity) { 3478 ret = get_zones_wp(bs, s->fd, 0, bs->bl.nr_zones, 1); 3479 if (ret < 0) { 3480 error_report("reporting single wp failed"); 3481 return ret; 3482 } 3483 } else if (zo == BLKRESETZONE) { 3484 for (unsigned int j = 0; j < nrz; ++j) { 3485 wp[j] = offset + j * zone_size; 3486 } 3487 } else if (zo == BLKFINISHZONE) { 3488 for (unsigned int j = 0; j < nrz; ++j) { 3489 /* The zoned device allows the last zone smaller that the 3490 * zone size. */ 3491 wp[j] = MIN(offset + (j + 1) * zone_size, offset + len); 3492 } 3493 } 3494 3495 return ret; 3496 } 3497 #endif 3498 3499 #if defined(CONFIG_BLKZONED) 3500 static int coroutine_fn raw_co_zone_append(BlockDriverState *bs, 3501 int64_t *offset, 3502 QEMUIOVector *qiov, 3503 BdrvRequestFlags flags) { 3504 assert(flags == 0); 3505 int64_t zone_size_mask = bs->bl.zone_size - 1; 3506 int64_t iov_len = 0; 3507 int64_t len = 0; 3508 BDRVRawState *s = bs->opaque; 3509 s->offset = offset; 3510 3511 if (*offset & zone_size_mask) { 3512 error_report("sector offset %" PRId64 " is not aligned to zone size " 3513 "%" PRId32 "", *offset / 512, bs->bl.zone_size / 512); 3514 return -EINVAL; 3515 } 3516 3517 int64_t wg = bs->bl.write_granularity; 3518 int64_t wg_mask = wg - 1; 3519 for (int i = 0; i < qiov->niov; i++) { 3520 iov_len = qiov->iov[i].iov_len; 3521 if (iov_len & wg_mask) { 3522 error_report("len of IOVector[%d] %" PRId64 " is not aligned to " 3523 "block size %" PRId64 "", i, iov_len, wg); 3524 return -EINVAL; 3525 } 3526 len += iov_len; 3527 } 3528 3529 trace_zbd_zone_append(bs, *offset >> BDRV_SECTOR_BITS); 3530 return raw_co_prw(bs, *offset, len, qiov, QEMU_AIO_ZONE_APPEND); 3531 } 3532 #endif 3533 3534 static coroutine_fn int 3535 raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes, 3536 bool blkdev) 3537 { 3538 BDRVRawState *s = bs->opaque; 3539 RawPosixAIOData acb; 3540 int ret; 3541 3542 acb = (RawPosixAIOData) { 3543 .bs = bs, 3544 .aio_fildes = s->fd, 3545 .aio_type = QEMU_AIO_DISCARD, 3546 .aio_offset = offset, 3547 .aio_nbytes = bytes, 3548 }; 3549 3550 if (blkdev) { 3551 acb.aio_type |= QEMU_AIO_BLKDEV; 3552 } 3553 3554 ret = raw_thread_pool_submit(handle_aiocb_discard, &acb); 3555 raw_account_discard(s, bytes, ret); 3556 return ret; 3557 } 3558 3559 static coroutine_fn int 3560 raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) 3561 { 3562 return raw_do_pdiscard(bs, offset, bytes, false); 3563 } 3564 3565 static int coroutine_fn 3566 raw_do_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, 3567 BdrvRequestFlags flags, bool blkdev) 3568 { 3569 BDRVRawState *s = bs->opaque; 3570 RawPosixAIOData acb; 3571 ThreadPoolFunc *handler; 3572 3573 #ifdef CONFIG_FALLOCATE 3574 if (offset + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) { 3575 BdrvTrackedRequest *req; 3576 3577 /* 3578 * This is a workaround for a bug in the Linux XFS driver, 3579 * where writes submitted through the AIO interface will be 3580 * discarded if they happen beyond a concurrently running 3581 * fallocate() that increases the file length (i.e., both the 3582 * write and the fallocate() happen beyond the EOF). 3583 * 3584 * To work around it, we extend the tracked request for this 3585 * zero write until INT64_MAX (effectively infinity), and mark 3586 * it as serializing. 3587 * 3588 * We have to enable this workaround for all filesystems and 3589 * AIO modes (not just XFS with aio=native), because for 3590 * remote filesystems we do not know the host configuration. 3591 */ 3592 3593 req = bdrv_co_get_self_request(bs); 3594 assert(req); 3595 assert(req->type == BDRV_TRACKED_WRITE); 3596 assert(req->offset <= offset); 3597 assert(req->offset + req->bytes >= offset + bytes); 3598 3599 req->bytes = BDRV_MAX_LENGTH - req->offset; 3600 3601 bdrv_check_request(req->offset, req->bytes, &error_abort); 3602 3603 bdrv_make_request_serialising(req, bs->bl.request_alignment); 3604 } 3605 #endif 3606 3607 acb = (RawPosixAIOData) { 3608 .bs = bs, 3609 .aio_fildes = s->fd, 3610 .aio_type = QEMU_AIO_WRITE_ZEROES, 3611 .aio_offset = offset, 3612 .aio_nbytes = bytes, 3613 }; 3614 3615 if (blkdev) { 3616 acb.aio_type |= QEMU_AIO_BLKDEV; 3617 } 3618 if (flags & BDRV_REQ_NO_FALLBACK) { 3619 acb.aio_type |= QEMU_AIO_NO_FALLBACK; 3620 } 3621 3622 if (flags & BDRV_REQ_MAY_UNMAP) { 3623 acb.aio_type |= QEMU_AIO_DISCARD; 3624 handler = handle_aiocb_write_zeroes_unmap; 3625 } else { 3626 handler = handle_aiocb_write_zeroes; 3627 } 3628 3629 return raw_thread_pool_submit(handler, &acb); 3630 } 3631 3632 static int coroutine_fn raw_co_pwrite_zeroes( 3633 BlockDriverState *bs, int64_t offset, 3634 int64_t bytes, BdrvRequestFlags flags) 3635 { 3636 return raw_do_pwrite_zeroes(bs, offset, bytes, flags, false); 3637 } 3638 3639 static int coroutine_fn 3640 raw_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 3641 { 3642 return 0; 3643 } 3644 3645 static ImageInfoSpecific *raw_get_specific_info(BlockDriverState *bs, 3646 Error **errp) 3647 { 3648 ImageInfoSpecificFile *file_info = g_new0(ImageInfoSpecificFile, 1); 3649 ImageInfoSpecific *spec_info = g_new(ImageInfoSpecific, 1); 3650 3651 *spec_info = (ImageInfoSpecific){ 3652 .type = IMAGE_INFO_SPECIFIC_KIND_FILE, 3653 .u.file.data = file_info, 3654 }; 3655 3656 #ifdef FS_IOC_FSGETXATTR 3657 { 3658 BDRVRawState *s = bs->opaque; 3659 struct fsxattr attr; 3660 int ret; 3661 3662 ret = ioctl(s->fd, FS_IOC_FSGETXATTR, &attr); 3663 if (!ret && attr.fsx_extsize != 0) { 3664 file_info->has_extent_size_hint = true; 3665 file_info->extent_size_hint = attr.fsx_extsize; 3666 } 3667 } 3668 #endif 3669 3670 return spec_info; 3671 } 3672 3673 static BlockStatsSpecificFile get_blockstats_specific_file(BlockDriverState *bs) 3674 { 3675 BDRVRawState *s = bs->opaque; 3676 return (BlockStatsSpecificFile) { 3677 .discard_nb_ok = s->stats.discard_nb_ok, 3678 .discard_nb_failed = s->stats.discard_nb_failed, 3679 .discard_bytes_ok = s->stats.discard_bytes_ok, 3680 }; 3681 } 3682 3683 static BlockStatsSpecific *raw_get_specific_stats(BlockDriverState *bs) 3684 { 3685 BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1); 3686 3687 stats->driver = BLOCKDEV_DRIVER_FILE; 3688 stats->u.file = get_blockstats_specific_file(bs); 3689 3690 return stats; 3691 } 3692 3693 #if defined(HAVE_HOST_BLOCK_DEVICE) 3694 static BlockStatsSpecific *hdev_get_specific_stats(BlockDriverState *bs) 3695 { 3696 BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1); 3697 3698 stats->driver = BLOCKDEV_DRIVER_HOST_DEVICE; 3699 stats->u.host_device = get_blockstats_specific_file(bs); 3700 3701 return stats; 3702 } 3703 #endif /* HAVE_HOST_BLOCK_DEVICE */ 3704 3705 static QemuOptsList raw_create_opts = { 3706 .name = "raw-create-opts", 3707 .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head), 3708 .desc = { 3709 { 3710 .name = BLOCK_OPT_SIZE, 3711 .type = QEMU_OPT_SIZE, 3712 .help = "Virtual disk size" 3713 }, 3714 { 3715 .name = BLOCK_OPT_NOCOW, 3716 .type = QEMU_OPT_BOOL, 3717 .help = "Turn off copy-on-write (valid only on btrfs)" 3718 }, 3719 { 3720 .name = BLOCK_OPT_PREALLOC, 3721 .type = QEMU_OPT_STRING, 3722 .help = "Preallocation mode (allowed values: off" 3723 #ifdef CONFIG_POSIX_FALLOCATE 3724 ", falloc" 3725 #endif 3726 ", full)" 3727 }, 3728 { 3729 .name = BLOCK_OPT_EXTENT_SIZE_HINT, 3730 .type = QEMU_OPT_SIZE, 3731 .help = "Extent size hint for the image file, 0 to disable" 3732 }, 3733 { /* end of list */ } 3734 } 3735 }; 3736 3737 static int raw_check_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared, 3738 Error **errp) 3739 { 3740 BDRVRawState *s = bs->opaque; 3741 int input_flags = s->reopen_state ? s->reopen_state->flags : bs->open_flags; 3742 int open_flags; 3743 int ret; 3744 3745 /* We may need a new fd if auto-read-only switches the mode */ 3746 ret = raw_reconfigure_getfd(bs, input_flags, &open_flags, perm, 3747 false, errp); 3748 if (ret < 0) { 3749 return ret; 3750 } else if (ret != s->fd) { 3751 Error *local_err = NULL; 3752 3753 /* 3754 * Fail already check_perm() if we can't get a working O_DIRECT 3755 * alignment with the new fd. 3756 */ 3757 raw_probe_alignment(bs, ret, &local_err); 3758 if (local_err) { 3759 error_propagate(errp, local_err); 3760 return -EINVAL; 3761 } 3762 3763 s->perm_change_fd = ret; 3764 s->perm_change_flags = open_flags; 3765 } 3766 3767 /* Prepare permissions on old fd to avoid conflicts between old and new, 3768 * but keep everything locked that new will need. */ 3769 ret = raw_handle_perm_lock(bs, RAW_PL_PREPARE, perm, shared, errp); 3770 if (ret < 0) { 3771 goto fail; 3772 } 3773 3774 /* Copy locks to the new fd */ 3775 if (s->perm_change_fd && s->use_lock) { 3776 ret = raw_apply_lock_bytes(NULL, s->perm_change_fd, perm, ~shared, 3777 false, errp); 3778 if (ret < 0) { 3779 raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL); 3780 goto fail; 3781 } 3782 } 3783 return 0; 3784 3785 fail: 3786 if (s->perm_change_fd) { 3787 qemu_close(s->perm_change_fd); 3788 } 3789 s->perm_change_fd = 0; 3790 return ret; 3791 } 3792 3793 static void raw_set_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared) 3794 { 3795 BDRVRawState *s = bs->opaque; 3796 3797 /* For reopen, we have already switched to the new fd (.bdrv_set_perm is 3798 * called after .bdrv_reopen_commit) */ 3799 if (s->perm_change_fd && s->fd != s->perm_change_fd) { 3800 qemu_close(s->fd); 3801 s->fd = s->perm_change_fd; 3802 s->open_flags = s->perm_change_flags; 3803 } 3804 s->perm_change_fd = 0; 3805 3806 raw_handle_perm_lock(bs, RAW_PL_COMMIT, perm, shared, NULL); 3807 s->perm = perm; 3808 s->shared_perm = shared; 3809 } 3810 3811 static void raw_abort_perm_update(BlockDriverState *bs) 3812 { 3813 BDRVRawState *s = bs->opaque; 3814 3815 /* For reopen, .bdrv_reopen_abort is called afterwards and will close 3816 * the file descriptor. */ 3817 if (s->perm_change_fd) { 3818 qemu_close(s->perm_change_fd); 3819 } 3820 s->perm_change_fd = 0; 3821 3822 raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL); 3823 } 3824 3825 static int coroutine_fn GRAPH_RDLOCK raw_co_copy_range_from( 3826 BlockDriverState *bs, BdrvChild *src, int64_t src_offset, 3827 BdrvChild *dst, int64_t dst_offset, int64_t bytes, 3828 BdrvRequestFlags read_flags, BdrvRequestFlags write_flags) 3829 { 3830 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 3831 read_flags, write_flags); 3832 } 3833 3834 static int coroutine_fn GRAPH_RDLOCK 3835 raw_co_copy_range_to(BlockDriverState *bs, 3836 BdrvChild *src, int64_t src_offset, 3837 BdrvChild *dst, int64_t dst_offset, 3838 int64_t bytes, BdrvRequestFlags read_flags, 3839 BdrvRequestFlags write_flags) 3840 { 3841 RawPosixAIOData acb; 3842 BDRVRawState *s = bs->opaque; 3843 BDRVRawState *src_s; 3844 3845 assert(dst->bs == bs); 3846 if (src->bs->drv->bdrv_co_copy_range_to != raw_co_copy_range_to) { 3847 return -ENOTSUP; 3848 } 3849 3850 src_s = src->bs->opaque; 3851 if (fd_open(src->bs) < 0 || fd_open(dst->bs) < 0) { 3852 return -EIO; 3853 } 3854 3855 acb = (RawPosixAIOData) { 3856 .bs = bs, 3857 .aio_type = QEMU_AIO_COPY_RANGE, 3858 .aio_fildes = src_s->fd, 3859 .aio_offset = src_offset, 3860 .aio_nbytes = bytes, 3861 .copy_range = { 3862 .aio_fd2 = s->fd, 3863 .aio_offset2 = dst_offset, 3864 }, 3865 }; 3866 3867 return raw_thread_pool_submit(handle_aiocb_copy_range, &acb); 3868 } 3869 3870 BlockDriver bdrv_file = { 3871 .format_name = "file", 3872 .protocol_name = "file", 3873 .instance_size = sizeof(BDRVRawState), 3874 .bdrv_needs_filename = true, 3875 .bdrv_probe = NULL, /* no probe for protocols */ 3876 .bdrv_parse_filename = raw_parse_filename, 3877 .bdrv_file_open = raw_open, 3878 .bdrv_reopen_prepare = raw_reopen_prepare, 3879 .bdrv_reopen_commit = raw_reopen_commit, 3880 .bdrv_reopen_abort = raw_reopen_abort, 3881 .bdrv_close = raw_close, 3882 .bdrv_co_create = raw_co_create, 3883 .bdrv_co_create_opts = raw_co_create_opts, 3884 .bdrv_has_zero_init = bdrv_has_zero_init_1, 3885 .bdrv_co_block_status = raw_co_block_status, 3886 .bdrv_co_invalidate_cache = raw_co_invalidate_cache, 3887 .bdrv_co_pwrite_zeroes = raw_co_pwrite_zeroes, 3888 .bdrv_co_delete_file = raw_co_delete_file, 3889 3890 .bdrv_co_preadv = raw_co_preadv, 3891 .bdrv_co_pwritev = raw_co_pwritev, 3892 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 3893 .bdrv_co_pdiscard = raw_co_pdiscard, 3894 .bdrv_co_copy_range_from = raw_co_copy_range_from, 3895 .bdrv_co_copy_range_to = raw_co_copy_range_to, 3896 .bdrv_refresh_limits = raw_refresh_limits, 3897 .bdrv_attach_aio_context = raw_aio_attach_aio_context, 3898 3899 .bdrv_co_truncate = raw_co_truncate, 3900 .bdrv_co_getlength = raw_co_getlength, 3901 .bdrv_co_get_info = raw_co_get_info, 3902 .bdrv_get_specific_info = raw_get_specific_info, 3903 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 3904 .bdrv_get_specific_stats = raw_get_specific_stats, 3905 .bdrv_check_perm = raw_check_perm, 3906 .bdrv_set_perm = raw_set_perm, 3907 .bdrv_abort_perm_update = raw_abort_perm_update, 3908 .create_opts = &raw_create_opts, 3909 .mutable_opts = mutable_opts, 3910 }; 3911 3912 /***********************************************/ 3913 /* host device */ 3914 3915 #if defined(HAVE_HOST_BLOCK_DEVICE) 3916 3917 #if defined(__APPLE__) && defined(__MACH__) 3918 static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath, 3919 CFIndex maxPathSize, int flags); 3920 3921 #if !defined(MAC_OS_VERSION_12_0) \ 3922 || (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_VERSION_12_0) 3923 #define IOMainPort IOMasterPort 3924 #endif 3925 3926 static char *FindEjectableOpticalMedia(io_iterator_t *mediaIterator) 3927 { 3928 kern_return_t kernResult = KERN_FAILURE; 3929 mach_port_t mainPort; 3930 CFMutableDictionaryRef classesToMatch; 3931 const char *matching_array[] = {kIODVDMediaClass, kIOCDMediaClass}; 3932 char *mediaType = NULL; 3933 3934 kernResult = IOMainPort(MACH_PORT_NULL, &mainPort); 3935 if ( KERN_SUCCESS != kernResult ) { 3936 printf("IOMainPort returned %d\n", kernResult); 3937 } 3938 3939 int index; 3940 for (index = 0; index < ARRAY_SIZE(matching_array); index++) { 3941 classesToMatch = IOServiceMatching(matching_array[index]); 3942 if (classesToMatch == NULL) { 3943 error_report("IOServiceMatching returned NULL for %s", 3944 matching_array[index]); 3945 continue; 3946 } 3947 CFDictionarySetValue(classesToMatch, CFSTR(kIOMediaEjectableKey), 3948 kCFBooleanTrue); 3949 kernResult = IOServiceGetMatchingServices(mainPort, classesToMatch, 3950 mediaIterator); 3951 if (kernResult != KERN_SUCCESS) { 3952 error_report("Note: IOServiceGetMatchingServices returned %d", 3953 kernResult); 3954 continue; 3955 } 3956 3957 /* If a match was found, leave the loop */ 3958 if (*mediaIterator != 0) { 3959 trace_file_FindEjectableOpticalMedia(matching_array[index]); 3960 mediaType = g_strdup(matching_array[index]); 3961 break; 3962 } 3963 } 3964 return mediaType; 3965 } 3966 3967 kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath, 3968 CFIndex maxPathSize, int flags) 3969 { 3970 io_object_t nextMedia; 3971 kern_return_t kernResult = KERN_FAILURE; 3972 *bsdPath = '\0'; 3973 nextMedia = IOIteratorNext( mediaIterator ); 3974 if ( nextMedia ) 3975 { 3976 CFTypeRef bsdPathAsCFString; 3977 bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 ); 3978 if ( bsdPathAsCFString ) { 3979 size_t devPathLength; 3980 strcpy( bsdPath, _PATH_DEV ); 3981 if (flags & BDRV_O_NOCACHE) { 3982 strcat(bsdPath, "r"); 3983 } 3984 devPathLength = strlen( bsdPath ); 3985 if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) { 3986 kernResult = KERN_SUCCESS; 3987 } 3988 CFRelease( bsdPathAsCFString ); 3989 } 3990 IOObjectRelease( nextMedia ); 3991 } 3992 3993 return kernResult; 3994 } 3995 3996 /* Sets up a real cdrom for use in QEMU */ 3997 static bool setup_cdrom(char *bsd_path, Error **errp) 3998 { 3999 int index, num_of_test_partitions = 2, fd; 4000 char test_partition[MAXPATHLEN]; 4001 bool partition_found = false; 4002 4003 /* look for a working partition */ 4004 for (index = 0; index < num_of_test_partitions; index++) { 4005 snprintf(test_partition, sizeof(test_partition), "%ss%d", bsd_path, 4006 index); 4007 fd = qemu_open(test_partition, O_RDONLY | O_BINARY | O_LARGEFILE, NULL); 4008 if (fd >= 0) { 4009 partition_found = true; 4010 qemu_close(fd); 4011 break; 4012 } 4013 } 4014 4015 /* if a working partition on the device was not found */ 4016 if (partition_found == false) { 4017 error_setg(errp, "Failed to find a working partition on disc"); 4018 } else { 4019 trace_file_setup_cdrom(test_partition); 4020 pstrcpy(bsd_path, MAXPATHLEN, test_partition); 4021 } 4022 return partition_found; 4023 } 4024 4025 /* Prints directions on mounting and unmounting a device */ 4026 static void print_unmounting_directions(const char *file_name) 4027 { 4028 error_report("If device %s is mounted on the desktop, unmount" 4029 " it first before using it in QEMU", file_name); 4030 error_report("Command to unmount device: diskutil unmountDisk %s", 4031 file_name); 4032 error_report("Command to mount device: diskutil mountDisk %s", file_name); 4033 } 4034 4035 #endif /* defined(__APPLE__) && defined(__MACH__) */ 4036 4037 static int hdev_probe_device(const char *filename) 4038 { 4039 struct stat st; 4040 4041 /* allow a dedicated CD-ROM driver to match with a higher priority */ 4042 if (strstart(filename, "/dev/cdrom", NULL)) 4043 return 50; 4044 4045 if (stat(filename, &st) >= 0 && 4046 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { 4047 return 100; 4048 } 4049 4050 return 0; 4051 } 4052 4053 static void hdev_parse_filename(const char *filename, QDict *options, 4054 Error **errp) 4055 { 4056 bdrv_parse_filename_strip_prefix(filename, "host_device:", options); 4057 } 4058 4059 static bool hdev_is_sg(BlockDriverState *bs) 4060 { 4061 4062 #if defined(__linux__) 4063 4064 BDRVRawState *s = bs->opaque; 4065 struct stat st; 4066 struct sg_scsi_id scsiid; 4067 int sg_version; 4068 int ret; 4069 4070 if (stat(bs->filename, &st) < 0 || !S_ISCHR(st.st_mode)) { 4071 return false; 4072 } 4073 4074 ret = ioctl(s->fd, SG_GET_VERSION_NUM, &sg_version); 4075 if (ret < 0) { 4076 return false; 4077 } 4078 4079 ret = ioctl(s->fd, SG_GET_SCSI_ID, &scsiid); 4080 if (ret >= 0) { 4081 trace_file_hdev_is_sg(scsiid.scsi_type, sg_version); 4082 return true; 4083 } 4084 4085 #endif 4086 4087 return false; 4088 } 4089 4090 static int hdev_open(BlockDriverState *bs, QDict *options, int flags, 4091 Error **errp) 4092 { 4093 BDRVRawState *s = bs->opaque; 4094 int ret; 4095 4096 #if defined(__APPLE__) && defined(__MACH__) 4097 /* 4098 * Caution: while qdict_get_str() is fine, getting non-string types 4099 * would require more care. When @options come from -blockdev or 4100 * blockdev_add, its members are typed according to the QAPI 4101 * schema, but when they come from -drive, they're all QString. 4102 */ 4103 const char *filename = qdict_get_str(options, "filename"); 4104 char bsd_path[MAXPATHLEN] = ""; 4105 bool error_occurred = false; 4106 4107 /* If using a real cdrom */ 4108 if (strcmp(filename, "/dev/cdrom") == 0) { 4109 char *mediaType = NULL; 4110 kern_return_t ret_val; 4111 io_iterator_t mediaIterator = 0; 4112 4113 mediaType = FindEjectableOpticalMedia(&mediaIterator); 4114 if (mediaType == NULL) { 4115 error_setg(errp, "Please make sure your CD/DVD is in the optical" 4116 " drive"); 4117 error_occurred = true; 4118 goto hdev_open_Mac_error; 4119 } 4120 4121 ret_val = GetBSDPath(mediaIterator, bsd_path, sizeof(bsd_path), flags); 4122 if (ret_val != KERN_SUCCESS) { 4123 error_setg(errp, "Could not get BSD path for optical drive"); 4124 error_occurred = true; 4125 goto hdev_open_Mac_error; 4126 } 4127 4128 /* If a real optical drive was not found */ 4129 if (bsd_path[0] == '\0') { 4130 error_setg(errp, "Failed to obtain bsd path for optical drive"); 4131 error_occurred = true; 4132 goto hdev_open_Mac_error; 4133 } 4134 4135 /* If using a cdrom disc and finding a partition on the disc failed */ 4136 if (strncmp(mediaType, kIOCDMediaClass, 9) == 0 && 4137 setup_cdrom(bsd_path, errp) == false) { 4138 print_unmounting_directions(bsd_path); 4139 error_occurred = true; 4140 goto hdev_open_Mac_error; 4141 } 4142 4143 qdict_put_str(options, "filename", bsd_path); 4144 4145 hdev_open_Mac_error: 4146 g_free(mediaType); 4147 if (mediaIterator) { 4148 IOObjectRelease(mediaIterator); 4149 } 4150 if (error_occurred) { 4151 return -ENOENT; 4152 } 4153 } 4154 #endif /* defined(__APPLE__) && defined(__MACH__) */ 4155 4156 s->type = FTYPE_FILE; 4157 4158 ret = raw_open_common(bs, options, flags, 0, true, errp); 4159 if (ret < 0) { 4160 #if defined(__APPLE__) && defined(__MACH__) 4161 if (*bsd_path) { 4162 filename = bsd_path; 4163 } 4164 /* if a physical device experienced an error while being opened */ 4165 if (strncmp(filename, "/dev/", 5) == 0) { 4166 print_unmounting_directions(filename); 4167 } 4168 #endif /* defined(__APPLE__) && defined(__MACH__) */ 4169 return ret; 4170 } 4171 4172 /* Since this does ioctl the device must be already opened */ 4173 bs->sg = hdev_is_sg(bs); 4174 4175 return ret; 4176 } 4177 4178 #if defined(__linux__) 4179 static int coroutine_fn 4180 hdev_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 4181 { 4182 BDRVRawState *s = bs->opaque; 4183 RawPosixAIOData acb; 4184 int ret; 4185 4186 ret = fd_open(bs); 4187 if (ret < 0) { 4188 return ret; 4189 } 4190 4191 if (req == SG_IO && s->pr_mgr) { 4192 struct sg_io_hdr *io_hdr = buf; 4193 if (io_hdr->cmdp[0] == PERSISTENT_RESERVE_OUT || 4194 io_hdr->cmdp[0] == PERSISTENT_RESERVE_IN) { 4195 return pr_manager_execute(s->pr_mgr, qemu_get_current_aio_context(), 4196 s->fd, io_hdr); 4197 } 4198 } 4199 4200 acb = (RawPosixAIOData) { 4201 .bs = bs, 4202 .aio_type = QEMU_AIO_IOCTL, 4203 .aio_fildes = s->fd, 4204 .aio_offset = 0, 4205 .ioctl = { 4206 .buf = buf, 4207 .cmd = req, 4208 }, 4209 }; 4210 4211 return raw_thread_pool_submit(handle_aiocb_ioctl, &acb); 4212 } 4213 #endif /* linux */ 4214 4215 static coroutine_fn int 4216 hdev_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) 4217 { 4218 BDRVRawState *s = bs->opaque; 4219 int ret; 4220 4221 ret = fd_open(bs); 4222 if (ret < 0) { 4223 raw_account_discard(s, bytes, ret); 4224 return ret; 4225 } 4226 return raw_do_pdiscard(bs, offset, bytes, true); 4227 } 4228 4229 static coroutine_fn int hdev_co_pwrite_zeroes(BlockDriverState *bs, 4230 int64_t offset, int64_t bytes, BdrvRequestFlags flags) 4231 { 4232 int rc; 4233 4234 rc = fd_open(bs); 4235 if (rc < 0) { 4236 return rc; 4237 } 4238 4239 return raw_do_pwrite_zeroes(bs, offset, bytes, flags, true); 4240 } 4241 4242 static BlockDriver bdrv_host_device = { 4243 .format_name = "host_device", 4244 .protocol_name = "host_device", 4245 .instance_size = sizeof(BDRVRawState), 4246 .bdrv_needs_filename = true, 4247 .bdrv_probe_device = hdev_probe_device, 4248 .bdrv_parse_filename = hdev_parse_filename, 4249 .bdrv_file_open = hdev_open, 4250 .bdrv_close = raw_close, 4251 .bdrv_reopen_prepare = raw_reopen_prepare, 4252 .bdrv_reopen_commit = raw_reopen_commit, 4253 .bdrv_reopen_abort = raw_reopen_abort, 4254 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 4255 .create_opts = &bdrv_create_opts_simple, 4256 .mutable_opts = mutable_opts, 4257 .bdrv_co_invalidate_cache = raw_co_invalidate_cache, 4258 .bdrv_co_pwrite_zeroes = hdev_co_pwrite_zeroes, 4259 4260 .bdrv_co_preadv = raw_co_preadv, 4261 .bdrv_co_pwritev = raw_co_pwritev, 4262 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 4263 .bdrv_co_pdiscard = hdev_co_pdiscard, 4264 .bdrv_co_copy_range_from = raw_co_copy_range_from, 4265 .bdrv_co_copy_range_to = raw_co_copy_range_to, 4266 .bdrv_refresh_limits = raw_refresh_limits, 4267 .bdrv_attach_aio_context = raw_aio_attach_aio_context, 4268 4269 .bdrv_co_truncate = raw_co_truncate, 4270 .bdrv_co_getlength = raw_co_getlength, 4271 .bdrv_co_get_info = raw_co_get_info, 4272 .bdrv_get_specific_info = raw_get_specific_info, 4273 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 4274 .bdrv_get_specific_stats = hdev_get_specific_stats, 4275 .bdrv_check_perm = raw_check_perm, 4276 .bdrv_set_perm = raw_set_perm, 4277 .bdrv_abort_perm_update = raw_abort_perm_update, 4278 .bdrv_probe_blocksizes = hdev_probe_blocksizes, 4279 .bdrv_probe_geometry = hdev_probe_geometry, 4280 4281 /* generic scsi device */ 4282 #ifdef __linux__ 4283 .bdrv_co_ioctl = hdev_co_ioctl, 4284 #endif 4285 4286 /* zoned device */ 4287 #if defined(CONFIG_BLKZONED) 4288 /* zone management operations */ 4289 .bdrv_co_zone_report = raw_co_zone_report, 4290 .bdrv_co_zone_mgmt = raw_co_zone_mgmt, 4291 .bdrv_co_zone_append = raw_co_zone_append, 4292 #endif 4293 }; 4294 4295 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 4296 static void cdrom_parse_filename(const char *filename, QDict *options, 4297 Error **errp) 4298 { 4299 bdrv_parse_filename_strip_prefix(filename, "host_cdrom:", options); 4300 } 4301 4302 static void cdrom_refresh_limits(BlockDriverState *bs, Error **errp) 4303 { 4304 bs->bl.has_variable_length = true; 4305 raw_refresh_limits(bs, errp); 4306 } 4307 #endif 4308 4309 #ifdef __linux__ 4310 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags, 4311 Error **errp) 4312 { 4313 BDRVRawState *s = bs->opaque; 4314 4315 s->type = FTYPE_CD; 4316 4317 /* open will not fail even if no CD is inserted, so add O_NONBLOCK */ 4318 return raw_open_common(bs, options, flags, O_NONBLOCK, true, errp); 4319 } 4320 4321 static int cdrom_probe_device(const char *filename) 4322 { 4323 int fd, ret; 4324 int prio = 0; 4325 struct stat st; 4326 4327 fd = qemu_open(filename, O_RDONLY | O_NONBLOCK, NULL); 4328 if (fd < 0) { 4329 goto out; 4330 } 4331 ret = fstat(fd, &st); 4332 if (ret == -1 || !S_ISBLK(st.st_mode)) { 4333 goto outc; 4334 } 4335 4336 /* Attempt to detect via a CDROM specific ioctl */ 4337 ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT); 4338 if (ret >= 0) 4339 prio = 100; 4340 4341 outc: 4342 qemu_close(fd); 4343 out: 4344 return prio; 4345 } 4346 4347 static bool coroutine_fn cdrom_co_is_inserted(BlockDriverState *bs) 4348 { 4349 BDRVRawState *s = bs->opaque; 4350 int ret; 4351 4352 ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT); 4353 return ret == CDS_DISC_OK; 4354 } 4355 4356 static void coroutine_fn cdrom_co_eject(BlockDriverState *bs, bool eject_flag) 4357 { 4358 BDRVRawState *s = bs->opaque; 4359 4360 if (eject_flag) { 4361 if (ioctl(s->fd, CDROMEJECT, NULL) < 0) 4362 perror("CDROMEJECT"); 4363 } else { 4364 if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0) 4365 perror("CDROMEJECT"); 4366 } 4367 } 4368 4369 static void coroutine_fn cdrom_co_lock_medium(BlockDriverState *bs, bool locked) 4370 { 4371 BDRVRawState *s = bs->opaque; 4372 4373 if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) { 4374 /* 4375 * Note: an error can happen if the distribution automatically 4376 * mounts the CD-ROM 4377 */ 4378 /* perror("CDROM_LOCKDOOR"); */ 4379 } 4380 } 4381 4382 static BlockDriver bdrv_host_cdrom = { 4383 .format_name = "host_cdrom", 4384 .protocol_name = "host_cdrom", 4385 .instance_size = sizeof(BDRVRawState), 4386 .bdrv_needs_filename = true, 4387 .bdrv_probe_device = cdrom_probe_device, 4388 .bdrv_parse_filename = cdrom_parse_filename, 4389 .bdrv_file_open = cdrom_open, 4390 .bdrv_close = raw_close, 4391 .bdrv_reopen_prepare = raw_reopen_prepare, 4392 .bdrv_reopen_commit = raw_reopen_commit, 4393 .bdrv_reopen_abort = raw_reopen_abort, 4394 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 4395 .create_opts = &bdrv_create_opts_simple, 4396 .mutable_opts = mutable_opts, 4397 .bdrv_co_invalidate_cache = raw_co_invalidate_cache, 4398 4399 .bdrv_co_preadv = raw_co_preadv, 4400 .bdrv_co_pwritev = raw_co_pwritev, 4401 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 4402 .bdrv_refresh_limits = cdrom_refresh_limits, 4403 .bdrv_attach_aio_context = raw_aio_attach_aio_context, 4404 4405 .bdrv_co_truncate = raw_co_truncate, 4406 .bdrv_co_getlength = raw_co_getlength, 4407 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 4408 4409 /* removable device support */ 4410 .bdrv_co_is_inserted = cdrom_co_is_inserted, 4411 .bdrv_co_eject = cdrom_co_eject, 4412 .bdrv_co_lock_medium = cdrom_co_lock_medium, 4413 4414 /* generic scsi device */ 4415 .bdrv_co_ioctl = hdev_co_ioctl, 4416 }; 4417 #endif /* __linux__ */ 4418 4419 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) 4420 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags, 4421 Error **errp) 4422 { 4423 BDRVRawState *s = bs->opaque; 4424 int ret; 4425 4426 s->type = FTYPE_CD; 4427 4428 ret = raw_open_common(bs, options, flags, 0, true, errp); 4429 if (ret) { 4430 return ret; 4431 } 4432 4433 /* make sure the door isn't locked at this time */ 4434 ioctl(s->fd, CDIOCALLOW); 4435 return 0; 4436 } 4437 4438 static int cdrom_probe_device(const char *filename) 4439 { 4440 if (strstart(filename, "/dev/cd", NULL) || 4441 strstart(filename, "/dev/acd", NULL)) 4442 return 100; 4443 return 0; 4444 } 4445 4446 static int cdrom_reopen(BlockDriverState *bs) 4447 { 4448 BDRVRawState *s = bs->opaque; 4449 int fd; 4450 4451 /* 4452 * Force reread of possibly changed/newly loaded disc, 4453 * FreeBSD seems to not notice sometimes... 4454 */ 4455 if (s->fd >= 0) 4456 qemu_close(s->fd); 4457 fd = qemu_open(bs->filename, s->open_flags, NULL); 4458 if (fd < 0) { 4459 s->fd = -1; 4460 return -EIO; 4461 } 4462 s->fd = fd; 4463 4464 /* make sure the door isn't locked at this time */ 4465 ioctl(s->fd, CDIOCALLOW); 4466 return 0; 4467 } 4468 4469 static bool coroutine_fn cdrom_co_is_inserted(BlockDriverState *bs) 4470 { 4471 return raw_co_getlength(bs) > 0; 4472 } 4473 4474 static void coroutine_fn cdrom_co_eject(BlockDriverState *bs, bool eject_flag) 4475 { 4476 BDRVRawState *s = bs->opaque; 4477 4478 if (s->fd < 0) 4479 return; 4480 4481 (void) ioctl(s->fd, CDIOCALLOW); 4482 4483 if (eject_flag) { 4484 if (ioctl(s->fd, CDIOCEJECT) < 0) 4485 perror("CDIOCEJECT"); 4486 } else { 4487 if (ioctl(s->fd, CDIOCCLOSE) < 0) 4488 perror("CDIOCCLOSE"); 4489 } 4490 4491 cdrom_reopen(bs); 4492 } 4493 4494 static void coroutine_fn cdrom_co_lock_medium(BlockDriverState *bs, bool locked) 4495 { 4496 BDRVRawState *s = bs->opaque; 4497 4498 if (s->fd < 0) 4499 return; 4500 if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) { 4501 /* 4502 * Note: an error can happen if the distribution automatically 4503 * mounts the CD-ROM 4504 */ 4505 /* perror("CDROM_LOCKDOOR"); */ 4506 } 4507 } 4508 4509 static BlockDriver bdrv_host_cdrom = { 4510 .format_name = "host_cdrom", 4511 .protocol_name = "host_cdrom", 4512 .instance_size = sizeof(BDRVRawState), 4513 .bdrv_needs_filename = true, 4514 .bdrv_probe_device = cdrom_probe_device, 4515 .bdrv_parse_filename = cdrom_parse_filename, 4516 .bdrv_file_open = cdrom_open, 4517 .bdrv_close = raw_close, 4518 .bdrv_reopen_prepare = raw_reopen_prepare, 4519 .bdrv_reopen_commit = raw_reopen_commit, 4520 .bdrv_reopen_abort = raw_reopen_abort, 4521 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 4522 .create_opts = &bdrv_create_opts_simple, 4523 .mutable_opts = mutable_opts, 4524 4525 .bdrv_co_preadv = raw_co_preadv, 4526 .bdrv_co_pwritev = raw_co_pwritev, 4527 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 4528 .bdrv_refresh_limits = cdrom_refresh_limits, 4529 .bdrv_attach_aio_context = raw_aio_attach_aio_context, 4530 4531 .bdrv_co_truncate = raw_co_truncate, 4532 .bdrv_co_getlength = raw_co_getlength, 4533 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 4534 4535 /* removable device support */ 4536 .bdrv_co_is_inserted = cdrom_co_is_inserted, 4537 .bdrv_co_eject = cdrom_co_eject, 4538 .bdrv_co_lock_medium = cdrom_co_lock_medium, 4539 }; 4540 #endif /* __FreeBSD__ */ 4541 4542 #endif /* HAVE_HOST_BLOCK_DEVICE */ 4543 4544 static void bdrv_file_init(void) 4545 { 4546 /* 4547 * Register all the drivers. Note that order is important, the driver 4548 * registered last will get probed first. 4549 */ 4550 bdrv_register(&bdrv_file); 4551 #if defined(HAVE_HOST_BLOCK_DEVICE) 4552 bdrv_register(&bdrv_host_device); 4553 #ifdef __linux__ 4554 bdrv_register(&bdrv_host_cdrom); 4555 #endif 4556 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 4557 bdrv_register(&bdrv_host_cdrom); 4558 #endif 4559 #endif /* HAVE_HOST_BLOCK_DEVICE */ 4560 } 4561 4562 block_init(bdrv_file_init); 4563