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 raw_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 1163 * (a separate stage) of bdrv_reopen_multiple() so we can rely on this 1164 * fact and 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 size_t len; 1236 1237 if (!S_ISBLK(st->st_mode)) { 1238 return -ENOTSUP; 1239 } 1240 1241 sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/%s", 1242 major(st->st_rdev), minor(st->st_rdev), 1243 attribute); 1244 if (!g_file_get_contents(sysfspath, val, &len, NULL)) { 1245 return -ENOENT; 1246 } 1247 1248 /* The file is ended with '\n' */ 1249 char *p; 1250 p = *val; 1251 if (*(p + len - 1) == '\n') { 1252 *(p + len - 1) = '\0'; 1253 } 1254 return 0; 1255 } 1256 #endif 1257 1258 #if defined(CONFIG_BLKZONED) 1259 static int get_sysfs_zoned_model(struct stat *st, BlockZoneModel *zoned) 1260 { 1261 g_autofree char *val = NULL; 1262 int ret; 1263 1264 ret = get_sysfs_str_val(st, "zoned", &val); 1265 if (ret < 0) { 1266 return ret; 1267 } 1268 1269 if (strcmp(val, "host-managed") == 0) { 1270 *zoned = BLK_Z_HM; 1271 } else if (strcmp(val, "host-aware") == 0) { 1272 *zoned = BLK_Z_HA; 1273 } else if (strcmp(val, "none") == 0) { 1274 *zoned = BLK_Z_NONE; 1275 } else { 1276 return -ENOTSUP; 1277 } 1278 return 0; 1279 } 1280 #endif /* defined(CONFIG_BLKZONED) */ 1281 1282 /* 1283 * Get a sysfs attribute value as a long integer. 1284 */ 1285 #ifdef CONFIG_LINUX 1286 static long get_sysfs_long_val(struct stat *st, const char *attribute) 1287 { 1288 g_autofree char *str = NULL; 1289 const char *end; 1290 long val; 1291 int ret; 1292 1293 ret = get_sysfs_str_val(st, attribute, &str); 1294 if (ret < 0) { 1295 return ret; 1296 } 1297 1298 /* The file is ended with '\n', pass 'end' to accept that. */ 1299 ret = qemu_strtol(str, &end, 10, &val); 1300 if (ret == 0 && end && *end == '\0') { 1301 ret = val; 1302 } 1303 return ret; 1304 } 1305 #endif 1306 1307 static int hdev_get_max_segments(int fd, struct stat *st) 1308 { 1309 #ifdef CONFIG_LINUX 1310 int ret; 1311 1312 if (S_ISCHR(st->st_mode)) { 1313 if (ioctl(fd, SG_GET_SG_TABLESIZE, &ret) == 0) { 1314 return ret; 1315 } 1316 return -ENOTSUP; 1317 } 1318 return get_sysfs_long_val(st, "max_segments"); 1319 #else 1320 return -ENOTSUP; 1321 #endif 1322 } 1323 1324 #if defined(CONFIG_BLKZONED) 1325 /* 1326 * If the reset_all flag is true, then the wps of zone whose state is 1327 * not readonly or offline should be all reset to the start sector. 1328 * Else, take the real wp of the device. 1329 */ 1330 static int get_zones_wp(BlockDriverState *bs, int fd, int64_t offset, 1331 unsigned int nrz, bool reset_all) 1332 { 1333 struct blk_zone *blkz; 1334 size_t rep_size; 1335 uint64_t sector = offset >> BDRV_SECTOR_BITS; 1336 BlockZoneWps *wps = bs->wps; 1337 unsigned int j = offset / bs->bl.zone_size; 1338 unsigned int n = 0, i = 0; 1339 int ret; 1340 rep_size = sizeof(struct blk_zone_report) + nrz * sizeof(struct blk_zone); 1341 g_autofree struct blk_zone_report *rep = NULL; 1342 1343 rep = g_malloc(rep_size); 1344 blkz = (struct blk_zone *)(rep + 1); 1345 while (n < nrz) { 1346 memset(rep, 0, rep_size); 1347 rep->sector = sector; 1348 rep->nr_zones = nrz - n; 1349 1350 do { 1351 ret = ioctl(fd, BLKREPORTZONE, rep); 1352 } while (ret != 0 && errno == EINTR); 1353 if (ret != 0) { 1354 error_report("%d: ioctl BLKREPORTZONE at %" PRId64 " failed %d", 1355 fd, offset, errno); 1356 return -errno; 1357 } 1358 1359 if (!rep->nr_zones) { 1360 break; 1361 } 1362 1363 for (i = 0; i < rep->nr_zones; ++i, ++n, ++j) { 1364 /* 1365 * The wp tracking cares only about sequential writes required and 1366 * sequential write preferred zones so that the wp can advance to 1367 * the right location. 1368 * Use the most significant bit of the wp location to indicate the 1369 * zone type: 0 for SWR/SWP zones and 1 for conventional zones. 1370 */ 1371 if (blkz[i].type == BLK_ZONE_TYPE_CONVENTIONAL) { 1372 wps->wp[j] |= 1ULL << 63; 1373 } else { 1374 switch(blkz[i].cond) { 1375 case BLK_ZONE_COND_FULL: 1376 case BLK_ZONE_COND_READONLY: 1377 /* Zone not writable */ 1378 wps->wp[j] = (blkz[i].start + blkz[i].len) << BDRV_SECTOR_BITS; 1379 break; 1380 case BLK_ZONE_COND_OFFLINE: 1381 /* Zone not writable nor readable */ 1382 wps->wp[j] = (blkz[i].start) << BDRV_SECTOR_BITS; 1383 break; 1384 default: 1385 if (reset_all) { 1386 wps->wp[j] = blkz[i].start << BDRV_SECTOR_BITS; 1387 } else { 1388 wps->wp[j] = blkz[i].wp << BDRV_SECTOR_BITS; 1389 } 1390 break; 1391 } 1392 } 1393 } 1394 sector = blkz[i - 1].start + blkz[i - 1].len; 1395 } 1396 1397 return 0; 1398 } 1399 1400 static void update_zones_wp(BlockDriverState *bs, int fd, int64_t offset, 1401 unsigned int nrz) 1402 { 1403 if (get_zones_wp(bs, fd, offset, nrz, 0) < 0) { 1404 error_report("update zone wp failed"); 1405 } 1406 } 1407 1408 static void raw_refresh_zoned_limits(BlockDriverState *bs, struct stat *st, 1409 Error **errp) 1410 { 1411 BDRVRawState *s = bs->opaque; 1412 BlockZoneModel zoned; 1413 int ret; 1414 1415 ret = get_sysfs_zoned_model(st, &zoned); 1416 if (ret < 0 || zoned == BLK_Z_NONE) { 1417 goto no_zoned; 1418 } 1419 bs->bl.zoned = zoned; 1420 1421 ret = get_sysfs_long_val(st, "max_open_zones"); 1422 if (ret >= 0) { 1423 bs->bl.max_open_zones = ret; 1424 } 1425 1426 ret = get_sysfs_long_val(st, "max_active_zones"); 1427 if (ret >= 0) { 1428 bs->bl.max_active_zones = ret; 1429 } 1430 1431 /* 1432 * The zoned device must at least have zone size and nr_zones fields. 1433 */ 1434 ret = get_sysfs_long_val(st, "chunk_sectors"); 1435 if (ret < 0) { 1436 error_setg_errno(errp, -ret, "Unable to read chunk_sectors " 1437 "sysfs attribute"); 1438 goto no_zoned; 1439 } else if (!ret) { 1440 error_setg(errp, "Read 0 from chunk_sectors sysfs attribute"); 1441 goto no_zoned; 1442 } 1443 bs->bl.zone_size = ret << BDRV_SECTOR_BITS; 1444 1445 ret = get_sysfs_long_val(st, "nr_zones"); 1446 if (ret < 0) { 1447 error_setg_errno(errp, -ret, "Unable to read nr_zones " 1448 "sysfs attribute"); 1449 goto no_zoned; 1450 } else if (!ret) { 1451 error_setg(errp, "Read 0 from nr_zones sysfs attribute"); 1452 goto no_zoned; 1453 } 1454 bs->bl.nr_zones = ret; 1455 1456 ret = get_sysfs_long_val(st, "zone_append_max_bytes"); 1457 if (ret > 0) { 1458 bs->bl.max_append_sectors = ret >> BDRV_SECTOR_BITS; 1459 } 1460 1461 ret = get_sysfs_long_val(st, "physical_block_size"); 1462 if (ret >= 0) { 1463 bs->bl.write_granularity = ret; 1464 } 1465 1466 /* The refresh_limits() function can be called multiple times. */ 1467 g_free(bs->wps); 1468 bs->wps = g_malloc(sizeof(BlockZoneWps) + 1469 sizeof(int64_t) * bs->bl.nr_zones); 1470 ret = get_zones_wp(bs, s->fd, 0, bs->bl.nr_zones, 0); 1471 if (ret < 0) { 1472 error_setg_errno(errp, -ret, "report wps failed"); 1473 goto no_zoned; 1474 } 1475 qemu_co_mutex_init(&bs->wps->colock); 1476 return; 1477 1478 no_zoned: 1479 bs->bl.zoned = BLK_Z_NONE; 1480 g_free(bs->wps); 1481 bs->wps = NULL; 1482 } 1483 #else /* !defined(CONFIG_BLKZONED) */ 1484 static void raw_refresh_zoned_limits(BlockDriverState *bs, struct stat *st, 1485 Error **errp) 1486 { 1487 bs->bl.zoned = BLK_Z_NONE; 1488 } 1489 #endif /* !defined(CONFIG_BLKZONED) */ 1490 1491 static void raw_refresh_limits(BlockDriverState *bs, Error **errp) 1492 { 1493 BDRVRawState *s = bs->opaque; 1494 struct stat st; 1495 1496 s->needs_alignment = raw_needs_alignment(bs); 1497 raw_probe_alignment(bs, s->fd, errp); 1498 1499 bs->bl.min_mem_alignment = s->buf_align; 1500 bs->bl.opt_mem_alignment = MAX(s->buf_align, qemu_real_host_page_size()); 1501 1502 /* 1503 * Maximum transfers are best effort, so it is okay to ignore any 1504 * errors. That said, based on the man page errors in fstat would be 1505 * very much unexpected; the only possible case seems to be ENOMEM. 1506 */ 1507 if (fstat(s->fd, &st)) { 1508 return; 1509 } 1510 1511 #if defined(__APPLE__) && (__MACH__) 1512 struct statfs buf; 1513 1514 if (!fstatfs(s->fd, &buf)) { 1515 bs->bl.opt_transfer = buf.f_iosize; 1516 bs->bl.pdiscard_alignment = buf.f_bsize; 1517 } 1518 #endif 1519 1520 if (bdrv_is_sg(bs) || S_ISBLK(st.st_mode)) { 1521 int ret = hdev_get_max_hw_transfer(s->fd, &st); 1522 1523 if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) { 1524 bs->bl.max_hw_transfer = ret; 1525 } 1526 1527 ret = hdev_get_max_segments(s->fd, &st); 1528 if (ret > 0) { 1529 bs->bl.max_hw_iov = ret; 1530 } 1531 } 1532 1533 raw_refresh_zoned_limits(bs, &st, errp); 1534 } 1535 1536 static int check_for_dasd(int fd) 1537 { 1538 #ifdef BIODASDINFO2 1539 struct dasd_information2_t info = {0}; 1540 1541 return ioctl(fd, BIODASDINFO2, &info); 1542 #else 1543 return -1; 1544 #endif 1545 } 1546 1547 /** 1548 * Try to get @bs's logical and physical block size. 1549 * On success, store them in @bsz and return zero. 1550 * On failure, return negative errno. 1551 */ 1552 static int hdev_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) 1553 { 1554 BDRVRawState *s = bs->opaque; 1555 int ret; 1556 1557 /* If DASD or zoned devices, get blocksizes */ 1558 if (check_for_dasd(s->fd) < 0) { 1559 /* zoned devices are not DASD */ 1560 if (bs->bl.zoned == BLK_Z_NONE) { 1561 return -ENOTSUP; 1562 } 1563 } 1564 ret = probe_logical_blocksize(s->fd, &bsz->log); 1565 if (ret < 0) { 1566 return ret; 1567 } 1568 return probe_physical_blocksize(s->fd, &bsz->phys); 1569 } 1570 1571 /** 1572 * Try to get @bs's geometry: cyls, heads, sectors. 1573 * On success, store them in @geo and return 0. 1574 * On failure return -errno. 1575 * (Allows block driver to assign default geometry values that guest sees) 1576 */ 1577 #ifdef __linux__ 1578 static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo) 1579 { 1580 BDRVRawState *s = bs->opaque; 1581 struct hd_geometry ioctl_geo = {0}; 1582 1583 /* If DASD, get its geometry */ 1584 if (check_for_dasd(s->fd) < 0) { 1585 return -ENOTSUP; 1586 } 1587 if (ioctl(s->fd, HDIO_GETGEO, &ioctl_geo) < 0) { 1588 return -errno; 1589 } 1590 /* HDIO_GETGEO may return success even though geo contains zeros 1591 (e.g. certain multipath setups) */ 1592 if (!ioctl_geo.heads || !ioctl_geo.sectors || !ioctl_geo.cylinders) { 1593 return -ENOTSUP; 1594 } 1595 /* Do not return a geometry for partition */ 1596 if (ioctl_geo.start != 0) { 1597 return -ENOTSUP; 1598 } 1599 geo->heads = ioctl_geo.heads; 1600 geo->sectors = ioctl_geo.sectors; 1601 geo->cylinders = ioctl_geo.cylinders; 1602 1603 return 0; 1604 } 1605 #else /* __linux__ */ 1606 static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo) 1607 { 1608 return -ENOTSUP; 1609 } 1610 #endif 1611 1612 #if defined(__linux__) 1613 static int handle_aiocb_ioctl(void *opaque) 1614 { 1615 RawPosixAIOData *aiocb = opaque; 1616 int ret; 1617 1618 ret = RETRY_ON_EINTR( 1619 ioctl(aiocb->aio_fildes, aiocb->ioctl.cmd, aiocb->ioctl.buf) 1620 ); 1621 if (ret == -1) { 1622 return -errno; 1623 } 1624 1625 return 0; 1626 } 1627 #endif /* linux */ 1628 1629 static int handle_aiocb_flush(void *opaque) 1630 { 1631 RawPosixAIOData *aiocb = opaque; 1632 BDRVRawState *s = aiocb->bs->opaque; 1633 int ret; 1634 1635 if (s->page_cache_inconsistent) { 1636 return -s->page_cache_inconsistent; 1637 } 1638 1639 ret = qemu_fdatasync(aiocb->aio_fildes); 1640 if (ret == -1) { 1641 trace_file_flush_fdatasync_failed(errno); 1642 1643 /* There is no clear definition of the semantics of a failing fsync(), 1644 * so we may have to assume the worst. The sad truth is that this 1645 * assumption is correct for Linux. Some pages are now probably marked 1646 * clean in the page cache even though they are inconsistent with the 1647 * on-disk contents. The next fdatasync() call would succeed, but no 1648 * further writeback attempt will be made. We can't get back to a state 1649 * in which we know what is on disk (we would have to rewrite 1650 * everything that was touched since the last fdatasync() at least), so 1651 * make bdrv_flush() fail permanently. Given that the behaviour isn't 1652 * really defined, I have little hope that other OSes are doing better. 1653 * 1654 * Obviously, this doesn't affect O_DIRECT, which bypasses the page 1655 * cache. */ 1656 if ((s->open_flags & O_DIRECT) == 0) { 1657 s->page_cache_inconsistent = errno; 1658 } 1659 return -errno; 1660 } 1661 return 0; 1662 } 1663 1664 #ifdef CONFIG_PREADV 1665 1666 static bool preadv_present = true; 1667 1668 static ssize_t 1669 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1670 { 1671 return preadv(fd, iov, nr_iov, offset); 1672 } 1673 1674 static ssize_t 1675 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1676 { 1677 return pwritev(fd, iov, nr_iov, offset); 1678 } 1679 1680 #else 1681 1682 static bool preadv_present = false; 1683 1684 static ssize_t 1685 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1686 { 1687 return -ENOSYS; 1688 } 1689 1690 static ssize_t 1691 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) 1692 { 1693 return -ENOSYS; 1694 } 1695 1696 #endif 1697 1698 static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb) 1699 { 1700 ssize_t len; 1701 1702 len = RETRY_ON_EINTR( 1703 (aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) ? 1704 qemu_pwritev(aiocb->aio_fildes, 1705 aiocb->io.iov, 1706 aiocb->io.niov, 1707 aiocb->aio_offset) : 1708 qemu_preadv(aiocb->aio_fildes, 1709 aiocb->io.iov, 1710 aiocb->io.niov, 1711 aiocb->aio_offset) 1712 ); 1713 1714 if (len == -1) { 1715 return -errno; 1716 } 1717 return len; 1718 } 1719 1720 /* 1721 * Read/writes the data to/from a given linear buffer. 1722 * 1723 * Returns the number of bytes handles or -errno in case of an error. Short 1724 * reads are only returned if the end of the file is reached. 1725 */ 1726 static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf) 1727 { 1728 ssize_t offset = 0; 1729 ssize_t len; 1730 1731 while (offset < aiocb->aio_nbytes) { 1732 if (aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) { 1733 len = pwrite(aiocb->aio_fildes, 1734 (const char *)buf + offset, 1735 aiocb->aio_nbytes - offset, 1736 aiocb->aio_offset + offset); 1737 } else { 1738 len = pread(aiocb->aio_fildes, 1739 buf + offset, 1740 aiocb->aio_nbytes - offset, 1741 aiocb->aio_offset + offset); 1742 } 1743 if (len == -1 && errno == EINTR) { 1744 continue; 1745 } else if (len == -1 && errno == EINVAL && 1746 (aiocb->bs->open_flags & BDRV_O_NOCACHE) && 1747 !(aiocb->aio_type & QEMU_AIO_WRITE) && 1748 offset > 0) { 1749 /* O_DIRECT pread() may fail with EINVAL when offset is unaligned 1750 * after a short read. Assume that O_DIRECT short reads only occur 1751 * at EOF. Therefore this is a short read, not an I/O error. 1752 */ 1753 break; 1754 } else if (len == -1) { 1755 offset = -errno; 1756 break; 1757 } else if (len == 0) { 1758 break; 1759 } 1760 offset += len; 1761 } 1762 1763 return offset; 1764 } 1765 1766 static int handle_aiocb_rw(void *opaque) 1767 { 1768 RawPosixAIOData *aiocb = opaque; 1769 ssize_t nbytes; 1770 char *buf; 1771 1772 if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) { 1773 /* 1774 * If there is just a single buffer, and it is properly aligned 1775 * we can just use plain pread/pwrite without any problems. 1776 */ 1777 if (aiocb->io.niov == 1) { 1778 nbytes = handle_aiocb_rw_linear(aiocb, aiocb->io.iov->iov_base); 1779 goto out; 1780 } 1781 /* 1782 * We have more than one iovec, and all are properly aligned. 1783 * 1784 * Try preadv/pwritev first and fall back to linearizing the 1785 * buffer if it's not supported. 1786 */ 1787 if (preadv_present) { 1788 nbytes = handle_aiocb_rw_vector(aiocb); 1789 if (nbytes == aiocb->aio_nbytes || 1790 (nbytes < 0 && nbytes != -ENOSYS)) { 1791 goto out; 1792 } 1793 preadv_present = false; 1794 } 1795 1796 /* 1797 * XXX(hch): short read/write. no easy way to handle the reminder 1798 * using these interfaces. For now retry using plain 1799 * pread/pwrite? 1800 */ 1801 } 1802 1803 /* 1804 * Ok, we have to do it the hard way, copy all segments into 1805 * a single aligned buffer. 1806 */ 1807 buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes); 1808 if (buf == NULL) { 1809 nbytes = -ENOMEM; 1810 goto out; 1811 } 1812 1813 if (aiocb->aio_type & QEMU_AIO_WRITE) { 1814 char *p = buf; 1815 int i; 1816 1817 for (i = 0; i < aiocb->io.niov; ++i) { 1818 memcpy(p, aiocb->io.iov[i].iov_base, aiocb->io.iov[i].iov_len); 1819 p += aiocb->io.iov[i].iov_len; 1820 } 1821 assert(p - buf == aiocb->aio_nbytes); 1822 } 1823 1824 nbytes = handle_aiocb_rw_linear(aiocb, buf); 1825 if (!(aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND))) { 1826 char *p = buf; 1827 size_t count = aiocb->aio_nbytes, copy; 1828 int i; 1829 1830 for (i = 0; i < aiocb->io.niov && count; ++i) { 1831 copy = count; 1832 if (copy > aiocb->io.iov[i].iov_len) { 1833 copy = aiocb->io.iov[i].iov_len; 1834 } 1835 memcpy(aiocb->io.iov[i].iov_base, p, copy); 1836 assert(count >= copy); 1837 p += copy; 1838 count -= copy; 1839 } 1840 assert(count == 0); 1841 } 1842 qemu_vfree(buf); 1843 1844 out: 1845 if (nbytes == aiocb->aio_nbytes) { 1846 return 0; 1847 } else if (nbytes >= 0 && nbytes < aiocb->aio_nbytes) { 1848 if (aiocb->aio_type & QEMU_AIO_WRITE) { 1849 return -EINVAL; 1850 } else { 1851 iov_memset(aiocb->io.iov, aiocb->io.niov, nbytes, 1852 0, aiocb->aio_nbytes - nbytes); 1853 return 0; 1854 } 1855 } else { 1856 assert(nbytes < 0); 1857 return nbytes; 1858 } 1859 } 1860 1861 #if defined(CONFIG_FALLOCATE) || defined(BLKZEROOUT) || defined(BLKDISCARD) 1862 static int translate_err(int err) 1863 { 1864 if (err == -ENODEV || err == -ENOSYS || err == -EOPNOTSUPP || 1865 err == -ENOTTY) { 1866 err = -ENOTSUP; 1867 } 1868 return err; 1869 } 1870 #endif 1871 1872 #ifdef CONFIG_FALLOCATE 1873 static int do_fallocate(int fd, int mode, off_t offset, off_t len) 1874 { 1875 do { 1876 if (fallocate(fd, mode, offset, len) == 0) { 1877 return 0; 1878 } 1879 } while (errno == EINTR); 1880 return translate_err(-errno); 1881 } 1882 #endif 1883 1884 static ssize_t handle_aiocb_write_zeroes_block(RawPosixAIOData *aiocb) 1885 { 1886 int ret = -ENOTSUP; 1887 BDRVRawState *s = aiocb->bs->opaque; 1888 1889 if (!s->has_write_zeroes) { 1890 return -ENOTSUP; 1891 } 1892 1893 #ifdef BLKZEROOUT 1894 /* The BLKZEROOUT implementation in the kernel doesn't set 1895 * BLKDEV_ZERO_NOFALLBACK, so we can't call this if we have to avoid slow 1896 * fallbacks. */ 1897 if (!(aiocb->aio_type & QEMU_AIO_NO_FALLBACK)) { 1898 do { 1899 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes }; 1900 if (ioctl(aiocb->aio_fildes, BLKZEROOUT, range) == 0) { 1901 return 0; 1902 } 1903 } while (errno == EINTR); 1904 1905 ret = translate_err(-errno); 1906 if (ret == -ENOTSUP) { 1907 s->has_write_zeroes = false; 1908 } 1909 } 1910 #endif 1911 1912 return ret; 1913 } 1914 1915 static int handle_aiocb_write_zeroes(void *opaque) 1916 { 1917 RawPosixAIOData *aiocb = opaque; 1918 #ifdef CONFIG_FALLOCATE 1919 BDRVRawState *s = aiocb->bs->opaque; 1920 int64_t len; 1921 #endif 1922 1923 if (aiocb->aio_type & QEMU_AIO_BLKDEV) { 1924 return handle_aiocb_write_zeroes_block(aiocb); 1925 } 1926 1927 #ifdef CONFIG_FALLOCATE_ZERO_RANGE 1928 if (s->has_write_zeroes) { 1929 int ret = do_fallocate(s->fd, FALLOC_FL_ZERO_RANGE, 1930 aiocb->aio_offset, aiocb->aio_nbytes); 1931 if (ret == -ENOTSUP) { 1932 s->has_write_zeroes = false; 1933 } else if (ret == 0 || ret != -EINVAL) { 1934 return ret; 1935 } 1936 /* 1937 * Note: Some file systems do not like unaligned byte ranges, and 1938 * return EINVAL in such a case, though they should not do it according 1939 * to the man-page of fallocate(). Thus we simply ignore this return 1940 * value and try the other fallbacks instead. 1941 */ 1942 } 1943 #endif 1944 1945 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE 1946 if (s->has_discard && s->has_fallocate) { 1947 int ret = do_fallocate(s->fd, 1948 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 1949 aiocb->aio_offset, aiocb->aio_nbytes); 1950 if (ret == 0) { 1951 ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes); 1952 if (ret == 0 || ret != -ENOTSUP) { 1953 return ret; 1954 } 1955 s->has_fallocate = false; 1956 } else if (ret == -EINVAL) { 1957 /* 1958 * Some file systems like older versions of GPFS do not like un- 1959 * aligned byte ranges, and return EINVAL in such a case, though 1960 * they should not do it according to the man-page of fallocate(). 1961 * Warn about the bad filesystem and try the final fallback instead. 1962 */ 1963 warn_report_once("Your file system is misbehaving: " 1964 "fallocate(FALLOC_FL_PUNCH_HOLE) returned EINVAL. " 1965 "Please report this bug to your file system " 1966 "vendor."); 1967 } else if (ret != -ENOTSUP) { 1968 return ret; 1969 } else { 1970 s->has_discard = false; 1971 } 1972 } 1973 #endif 1974 1975 #ifdef CONFIG_FALLOCATE 1976 /* Last resort: we are trying to extend the file with zeroed data. This 1977 * can be done via fallocate(fd, 0) */ 1978 len = raw_getlength(aiocb->bs); 1979 if (s->has_fallocate && len >= 0 && aiocb->aio_offset >= len) { 1980 int ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes); 1981 if (ret == 0 || ret != -ENOTSUP) { 1982 return ret; 1983 } 1984 s->has_fallocate = false; 1985 } 1986 #endif 1987 1988 return -ENOTSUP; 1989 } 1990 1991 static int handle_aiocb_write_zeroes_unmap(void *opaque) 1992 { 1993 RawPosixAIOData *aiocb = opaque; 1994 BDRVRawState *s G_GNUC_UNUSED = aiocb->bs->opaque; 1995 1996 /* First try to write zeros and unmap at the same time */ 1997 1998 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE 1999 int ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 2000 aiocb->aio_offset, aiocb->aio_nbytes); 2001 switch (ret) { 2002 case -ENOTSUP: 2003 case -EINVAL: 2004 case -EBUSY: 2005 break; 2006 default: 2007 return ret; 2008 } 2009 #endif 2010 2011 /* If we couldn't manage to unmap while guaranteed that the area reads as 2012 * all-zero afterwards, just write zeroes without unmapping */ 2013 return handle_aiocb_write_zeroes(aiocb); 2014 } 2015 2016 #ifndef HAVE_COPY_FILE_RANGE 2017 static off_t copy_file_range(int in_fd, off_t *in_off, int out_fd, 2018 off_t *out_off, size_t len, unsigned int flags) 2019 { 2020 #ifdef __NR_copy_file_range 2021 return syscall(__NR_copy_file_range, in_fd, in_off, out_fd, 2022 out_off, len, flags); 2023 #else 2024 errno = ENOSYS; 2025 return -1; 2026 #endif 2027 } 2028 #endif 2029 2030 /* 2031 * parse_zone - Fill a zone descriptor 2032 */ 2033 #if defined(CONFIG_BLKZONED) 2034 static inline int parse_zone(struct BlockZoneDescriptor *zone, 2035 const struct blk_zone *blkz) { 2036 zone->start = blkz->start << BDRV_SECTOR_BITS; 2037 zone->length = blkz->len << BDRV_SECTOR_BITS; 2038 zone->wp = blkz->wp << BDRV_SECTOR_BITS; 2039 2040 #ifdef HAVE_BLK_ZONE_REP_CAPACITY 2041 zone->cap = blkz->capacity << BDRV_SECTOR_BITS; 2042 #else 2043 zone->cap = blkz->len << BDRV_SECTOR_BITS; 2044 #endif 2045 2046 switch (blkz->type) { 2047 case BLK_ZONE_TYPE_SEQWRITE_REQ: 2048 zone->type = BLK_ZT_SWR; 2049 break; 2050 case BLK_ZONE_TYPE_SEQWRITE_PREF: 2051 zone->type = BLK_ZT_SWP; 2052 break; 2053 case BLK_ZONE_TYPE_CONVENTIONAL: 2054 zone->type = BLK_ZT_CONV; 2055 break; 2056 default: 2057 error_report("Unsupported zone type: 0x%x", blkz->type); 2058 return -ENOTSUP; 2059 } 2060 2061 switch (blkz->cond) { 2062 case BLK_ZONE_COND_NOT_WP: 2063 zone->state = BLK_ZS_NOT_WP; 2064 break; 2065 case BLK_ZONE_COND_EMPTY: 2066 zone->state = BLK_ZS_EMPTY; 2067 break; 2068 case BLK_ZONE_COND_IMP_OPEN: 2069 zone->state = BLK_ZS_IOPEN; 2070 break; 2071 case BLK_ZONE_COND_EXP_OPEN: 2072 zone->state = BLK_ZS_EOPEN; 2073 break; 2074 case BLK_ZONE_COND_CLOSED: 2075 zone->state = BLK_ZS_CLOSED; 2076 break; 2077 case BLK_ZONE_COND_READONLY: 2078 zone->state = BLK_ZS_RDONLY; 2079 break; 2080 case BLK_ZONE_COND_FULL: 2081 zone->state = BLK_ZS_FULL; 2082 break; 2083 case BLK_ZONE_COND_OFFLINE: 2084 zone->state = BLK_ZS_OFFLINE; 2085 break; 2086 default: 2087 error_report("Unsupported zone state: 0x%x", blkz->cond); 2088 return -ENOTSUP; 2089 } 2090 return 0; 2091 } 2092 #endif 2093 2094 #if defined(CONFIG_BLKZONED) 2095 static int handle_aiocb_zone_report(void *opaque) 2096 { 2097 RawPosixAIOData *aiocb = opaque; 2098 int fd = aiocb->aio_fildes; 2099 unsigned int *nr_zones = aiocb->zone_report.nr_zones; 2100 BlockZoneDescriptor *zones = aiocb->zone_report.zones; 2101 /* zoned block devices use 512-byte sectors */ 2102 uint64_t sector = aiocb->aio_offset / 512; 2103 2104 struct blk_zone *blkz; 2105 size_t rep_size; 2106 unsigned int nrz; 2107 int ret; 2108 unsigned int n = 0, i = 0; 2109 2110 nrz = *nr_zones; 2111 rep_size = sizeof(struct blk_zone_report) + nrz * sizeof(struct blk_zone); 2112 g_autofree struct blk_zone_report *rep = NULL; 2113 rep = g_malloc(rep_size); 2114 2115 blkz = (struct blk_zone *)(rep + 1); 2116 while (n < nrz) { 2117 memset(rep, 0, rep_size); 2118 rep->sector = sector; 2119 rep->nr_zones = nrz - n; 2120 2121 do { 2122 ret = ioctl(fd, BLKREPORTZONE, rep); 2123 } while (ret != 0 && errno == EINTR); 2124 if (ret != 0) { 2125 error_report("%d: ioctl BLKREPORTZONE at %" PRId64 " failed %d", 2126 fd, sector, errno); 2127 return -errno; 2128 } 2129 2130 if (!rep->nr_zones) { 2131 break; 2132 } 2133 2134 for (i = 0; i < rep->nr_zones; i++, n++) { 2135 ret = parse_zone(&zones[n], &blkz[i]); 2136 if (ret != 0) { 2137 return ret; 2138 } 2139 2140 /* The next report should start after the last zone reported */ 2141 sector = blkz[i].start + blkz[i].len; 2142 } 2143 } 2144 2145 *nr_zones = n; 2146 return 0; 2147 } 2148 #endif 2149 2150 #if defined(CONFIG_BLKZONED) 2151 static int handle_aiocb_zone_mgmt(void *opaque) 2152 { 2153 RawPosixAIOData *aiocb = opaque; 2154 int fd = aiocb->aio_fildes; 2155 uint64_t sector = aiocb->aio_offset / 512; 2156 int64_t nr_sectors = aiocb->aio_nbytes / 512; 2157 struct blk_zone_range range; 2158 int ret; 2159 2160 /* Execute the operation */ 2161 range.sector = sector; 2162 range.nr_sectors = nr_sectors; 2163 do { 2164 ret = ioctl(fd, aiocb->zone_mgmt.op, &range); 2165 } while (ret != 0 && errno == EINTR); 2166 2167 return ret < 0 ? -errno : ret; 2168 } 2169 #endif 2170 2171 static int handle_aiocb_copy_range(void *opaque) 2172 { 2173 RawPosixAIOData *aiocb = opaque; 2174 uint64_t bytes = aiocb->aio_nbytes; 2175 off_t in_off = aiocb->aio_offset; 2176 off_t out_off = aiocb->copy_range.aio_offset2; 2177 2178 while (bytes) { 2179 ssize_t ret = copy_file_range(aiocb->aio_fildes, &in_off, 2180 aiocb->copy_range.aio_fd2, &out_off, 2181 bytes, 0); 2182 trace_file_copy_file_range(aiocb->bs, aiocb->aio_fildes, in_off, 2183 aiocb->copy_range.aio_fd2, out_off, bytes, 2184 0, ret); 2185 if (ret == 0) { 2186 /* No progress (e.g. when beyond EOF), let the caller fall back to 2187 * buffer I/O. */ 2188 return -ENOSPC; 2189 } 2190 if (ret < 0) { 2191 switch (errno) { 2192 case ENOSYS: 2193 return -ENOTSUP; 2194 case EINTR: 2195 continue; 2196 default: 2197 return -errno; 2198 } 2199 } 2200 bytes -= ret; 2201 } 2202 return 0; 2203 } 2204 2205 static int handle_aiocb_discard(void *opaque) 2206 { 2207 RawPosixAIOData *aiocb = opaque; 2208 int ret = -ENOTSUP; 2209 BDRVRawState *s = aiocb->bs->opaque; 2210 2211 if (!s->has_discard) { 2212 return -ENOTSUP; 2213 } 2214 2215 if (aiocb->aio_type & QEMU_AIO_BLKDEV) { 2216 #ifdef BLKDISCARD 2217 do { 2218 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes }; 2219 if (ioctl(aiocb->aio_fildes, BLKDISCARD, range) == 0) { 2220 return 0; 2221 } 2222 } while (errno == EINTR); 2223 2224 ret = translate_err(-errno); 2225 #endif 2226 } else { 2227 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE 2228 ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 2229 aiocb->aio_offset, aiocb->aio_nbytes); 2230 ret = translate_err(ret); 2231 #elif defined(__APPLE__) && (__MACH__) 2232 fpunchhole_t fpunchhole; 2233 fpunchhole.fp_flags = 0; 2234 fpunchhole.reserved = 0; 2235 fpunchhole.fp_offset = aiocb->aio_offset; 2236 fpunchhole.fp_length = aiocb->aio_nbytes; 2237 if (fcntl(s->fd, F_PUNCHHOLE, &fpunchhole) == -1) { 2238 ret = errno == ENODEV ? -ENOTSUP : -errno; 2239 } else { 2240 ret = 0; 2241 } 2242 #endif 2243 } 2244 2245 if (ret == -ENOTSUP) { 2246 s->has_discard = false; 2247 } 2248 return ret; 2249 } 2250 2251 /* 2252 * Help alignment probing by allocating the first block. 2253 * 2254 * When reading with direct I/O from unallocated area on Gluster backed by XFS, 2255 * reading succeeds regardless of request length. In this case we fallback to 2256 * safe alignment which is not optimal. Allocating the first block avoids this 2257 * fallback. 2258 * 2259 * fd may be opened with O_DIRECT, but we don't know the buffer alignment or 2260 * request alignment, so we use safe values. 2261 * 2262 * Returns: 0 on success, -errno on failure. Since this is an optimization, 2263 * caller may ignore failures. 2264 */ 2265 static int allocate_first_block(int fd, size_t max_size) 2266 { 2267 size_t write_size = (max_size < MAX_BLOCKSIZE) 2268 ? BDRV_SECTOR_SIZE 2269 : MAX_BLOCKSIZE; 2270 size_t max_align = MAX(MAX_BLOCKSIZE, qemu_real_host_page_size()); 2271 void *buf; 2272 ssize_t n; 2273 int ret; 2274 2275 buf = qemu_memalign(max_align, write_size); 2276 memset(buf, 0, write_size); 2277 2278 n = RETRY_ON_EINTR(pwrite(fd, buf, write_size, 0)); 2279 2280 ret = (n == -1) ? -errno : 0; 2281 2282 qemu_vfree(buf); 2283 return ret; 2284 } 2285 2286 static int handle_aiocb_truncate(void *opaque) 2287 { 2288 RawPosixAIOData *aiocb = opaque; 2289 int result = 0; 2290 int64_t current_length = 0; 2291 char *buf = NULL; 2292 struct stat st; 2293 int fd = aiocb->aio_fildes; 2294 int64_t offset = aiocb->aio_offset; 2295 PreallocMode prealloc = aiocb->truncate.prealloc; 2296 Error **errp = aiocb->truncate.errp; 2297 2298 if (fstat(fd, &st) < 0) { 2299 result = -errno; 2300 error_setg_errno(errp, -result, "Could not stat file"); 2301 return result; 2302 } 2303 2304 current_length = st.st_size; 2305 if (current_length > offset && prealloc != PREALLOC_MODE_OFF) { 2306 error_setg(errp, "Cannot use preallocation for shrinking files"); 2307 return -ENOTSUP; 2308 } 2309 2310 switch (prealloc) { 2311 #ifdef CONFIG_POSIX_FALLOCATE 2312 case PREALLOC_MODE_FALLOC: 2313 /* 2314 * Truncating before posix_fallocate() makes it about twice slower on 2315 * file systems that do not support fallocate(), trying to check if a 2316 * block is allocated before allocating it, so don't do that here. 2317 */ 2318 if (offset != current_length) { 2319 result = -posix_fallocate(fd, current_length, 2320 offset - current_length); 2321 if (result != 0) { 2322 /* posix_fallocate() doesn't set errno. */ 2323 error_setg_errno(errp, -result, 2324 "Could not preallocate new data"); 2325 } else if (current_length == 0) { 2326 /* 2327 * posix_fallocate() uses fallocate() if the filesystem 2328 * supports it, or fallback to manually writing zeroes. If 2329 * fallocate() was used, unaligned reads from the fallocated 2330 * area in raw_probe_alignment() will succeed, hence we need to 2331 * allocate the first block. 2332 * 2333 * Optimize future alignment probing; ignore failures. 2334 */ 2335 allocate_first_block(fd, offset); 2336 } 2337 } else { 2338 result = 0; 2339 } 2340 goto out; 2341 #endif 2342 case PREALLOC_MODE_FULL: 2343 { 2344 int64_t num = 0, left = offset - current_length; 2345 off_t seek_result; 2346 2347 /* 2348 * Knowing the final size from the beginning could allow the file 2349 * system driver to do less allocations and possibly avoid 2350 * fragmentation of the file. 2351 */ 2352 if (ftruncate(fd, offset) != 0) { 2353 result = -errno; 2354 error_setg_errno(errp, -result, "Could not resize file"); 2355 goto out; 2356 } 2357 2358 buf = g_malloc0(65536); 2359 2360 seek_result = lseek(fd, current_length, SEEK_SET); 2361 if (seek_result < 0) { 2362 result = -errno; 2363 error_setg_errno(errp, -result, 2364 "Failed to seek to the old end of file"); 2365 goto out; 2366 } 2367 2368 while (left > 0) { 2369 num = MIN(left, 65536); 2370 result = write(fd, buf, num); 2371 if (result < 0) { 2372 if (errno == EINTR) { 2373 continue; 2374 } 2375 result = -errno; 2376 error_setg_errno(errp, -result, 2377 "Could not write zeros for preallocation"); 2378 goto out; 2379 } 2380 left -= result; 2381 } 2382 if (result >= 0) { 2383 result = fsync(fd); 2384 if (result < 0) { 2385 result = -errno; 2386 error_setg_errno(errp, -result, 2387 "Could not flush file to disk"); 2388 goto out; 2389 } 2390 } 2391 goto out; 2392 } 2393 case PREALLOC_MODE_OFF: 2394 if (ftruncate(fd, offset) != 0) { 2395 result = -errno; 2396 error_setg_errno(errp, -result, "Could not resize file"); 2397 } else if (current_length == 0 && offset > current_length) { 2398 /* Optimize future alignment probing; ignore failures. */ 2399 allocate_first_block(fd, offset); 2400 } 2401 return result; 2402 default: 2403 result = -ENOTSUP; 2404 error_setg(errp, "Unsupported preallocation mode: %s", 2405 PreallocMode_str(prealloc)); 2406 return result; 2407 } 2408 2409 out: 2410 if (result < 0) { 2411 if (ftruncate(fd, current_length) < 0) { 2412 error_report("Failed to restore old file length: %s", 2413 strerror(errno)); 2414 } 2415 } 2416 2417 g_free(buf); 2418 return result; 2419 } 2420 2421 static int coroutine_fn raw_thread_pool_submit(ThreadPoolFunc func, void *arg) 2422 { 2423 return thread_pool_submit_co(func, arg); 2424 } 2425 2426 /* 2427 * Check if all memory in this vector is sector aligned. 2428 */ 2429 static bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) 2430 { 2431 int i; 2432 size_t alignment = bdrv_min_mem_align(bs); 2433 size_t len = bs->bl.request_alignment; 2434 IO_CODE(); 2435 2436 for (i = 0; i < qiov->niov; i++) { 2437 if ((uintptr_t) qiov->iov[i].iov_base % alignment) { 2438 return false; 2439 } 2440 if (qiov->iov[i].iov_len % len) { 2441 return false; 2442 } 2443 } 2444 2445 return true; 2446 } 2447 2448 static int coroutine_fn raw_co_prw(BlockDriverState *bs, uint64_t offset, 2449 uint64_t bytes, QEMUIOVector *qiov, int type) 2450 { 2451 BDRVRawState *s = bs->opaque; 2452 RawPosixAIOData acb; 2453 int ret; 2454 2455 if (fd_open(bs) < 0) 2456 return -EIO; 2457 #if defined(CONFIG_BLKZONED) 2458 if ((type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) && 2459 bs->bl.zoned != BLK_Z_NONE) { 2460 qemu_co_mutex_lock(&bs->wps->colock); 2461 if (type & QEMU_AIO_ZONE_APPEND) { 2462 int index = offset / bs->bl.zone_size; 2463 offset = bs->wps->wp[index]; 2464 } 2465 } 2466 #endif 2467 2468 /* 2469 * When using O_DIRECT, the request must be aligned to be able to use 2470 * either libaio or io_uring interface. If not fail back to regular thread 2471 * pool read/write code which emulates this for us if we 2472 * set QEMU_AIO_MISALIGNED. 2473 */ 2474 if (s->needs_alignment && !bdrv_qiov_is_aligned(bs, qiov)) { 2475 type |= QEMU_AIO_MISALIGNED; 2476 #ifdef CONFIG_LINUX_IO_URING 2477 } else if (s->use_linux_io_uring) { 2478 assert(qiov->size == bytes); 2479 ret = luring_co_submit(bs, s->fd, offset, qiov, type); 2480 goto out; 2481 #endif 2482 #ifdef CONFIG_LINUX_AIO 2483 } else if (s->use_linux_aio) { 2484 assert(qiov->size == bytes); 2485 ret = laio_co_submit(s->fd, offset, qiov, type, 2486 s->aio_max_batch); 2487 goto out; 2488 #endif 2489 } 2490 2491 acb = (RawPosixAIOData) { 2492 .bs = bs, 2493 .aio_fildes = s->fd, 2494 .aio_type = type, 2495 .aio_offset = offset, 2496 .aio_nbytes = bytes, 2497 .io = { 2498 .iov = qiov->iov, 2499 .niov = qiov->niov, 2500 }, 2501 }; 2502 2503 assert(qiov->size == bytes); 2504 ret = raw_thread_pool_submit(handle_aiocb_rw, &acb); 2505 goto out; /* Avoid the compiler err of unused label */ 2506 2507 out: 2508 #if defined(CONFIG_BLKZONED) 2509 if ((type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) && 2510 bs->bl.zoned != BLK_Z_NONE) { 2511 BlockZoneWps *wps = bs->wps; 2512 if (ret == 0) { 2513 uint64_t *wp = &wps->wp[offset / bs->bl.zone_size]; 2514 if (!BDRV_ZT_IS_CONV(*wp)) { 2515 if (type & QEMU_AIO_ZONE_APPEND) { 2516 *s->offset = *wp; 2517 trace_zbd_zone_append_complete(bs, *s->offset 2518 >> BDRV_SECTOR_BITS); 2519 } 2520 /* Advance the wp if needed */ 2521 if (offset + bytes > *wp) { 2522 *wp = offset + bytes; 2523 } 2524 } 2525 } else { 2526 update_zones_wp(bs, s->fd, 0, 1); 2527 } 2528 2529 qemu_co_mutex_unlock(&wps->colock); 2530 } 2531 #endif 2532 return ret; 2533 } 2534 2535 static int coroutine_fn raw_co_preadv(BlockDriverState *bs, int64_t offset, 2536 int64_t bytes, QEMUIOVector *qiov, 2537 BdrvRequestFlags flags) 2538 { 2539 return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_READ); 2540 } 2541 2542 static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, int64_t offset, 2543 int64_t bytes, QEMUIOVector *qiov, 2544 BdrvRequestFlags flags) 2545 { 2546 return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_WRITE); 2547 } 2548 2549 static int coroutine_fn raw_co_flush_to_disk(BlockDriverState *bs) 2550 { 2551 BDRVRawState *s = bs->opaque; 2552 RawPosixAIOData acb; 2553 int ret; 2554 2555 ret = fd_open(bs); 2556 if (ret < 0) { 2557 return ret; 2558 } 2559 2560 acb = (RawPosixAIOData) { 2561 .bs = bs, 2562 .aio_fildes = s->fd, 2563 .aio_type = QEMU_AIO_FLUSH, 2564 }; 2565 2566 #ifdef CONFIG_LINUX_IO_URING 2567 if (s->use_linux_io_uring) { 2568 return luring_co_submit(bs, s->fd, 0, NULL, QEMU_AIO_FLUSH); 2569 } 2570 #endif 2571 return raw_thread_pool_submit(handle_aiocb_flush, &acb); 2572 } 2573 2574 static void raw_aio_attach_aio_context(BlockDriverState *bs, 2575 AioContext *new_context) 2576 { 2577 BDRVRawState __attribute__((unused)) *s = bs->opaque; 2578 #ifdef CONFIG_LINUX_AIO 2579 if (s->use_linux_aio) { 2580 Error *local_err = NULL; 2581 if (!aio_setup_linux_aio(new_context, &local_err)) { 2582 error_reportf_err(local_err, "Unable to use native AIO, " 2583 "falling back to thread pool: "); 2584 s->use_linux_aio = false; 2585 } 2586 } 2587 #endif 2588 #ifdef CONFIG_LINUX_IO_URING 2589 if (s->use_linux_io_uring) { 2590 Error *local_err = NULL; 2591 if (!aio_setup_linux_io_uring(new_context, &local_err)) { 2592 error_reportf_err(local_err, "Unable to use linux io_uring, " 2593 "falling back to thread pool: "); 2594 s->use_linux_io_uring = false; 2595 } 2596 } 2597 #endif 2598 } 2599 2600 static void raw_close(BlockDriverState *bs) 2601 { 2602 BDRVRawState *s = bs->opaque; 2603 2604 if (s->fd >= 0) { 2605 #if defined(CONFIG_BLKZONED) 2606 g_free(bs->wps); 2607 #endif 2608 qemu_close(s->fd); 2609 s->fd = -1; 2610 } 2611 } 2612 2613 /** 2614 * Truncates the given regular file @fd to @offset and, when growing, fills the 2615 * new space according to @prealloc. 2616 * 2617 * Returns: 0 on success, -errno on failure. 2618 */ 2619 static int coroutine_fn 2620 raw_regular_truncate(BlockDriverState *bs, int fd, int64_t offset, 2621 PreallocMode prealloc, Error **errp) 2622 { 2623 RawPosixAIOData acb; 2624 2625 acb = (RawPosixAIOData) { 2626 .bs = bs, 2627 .aio_fildes = fd, 2628 .aio_type = QEMU_AIO_TRUNCATE, 2629 .aio_offset = offset, 2630 .truncate = { 2631 .prealloc = prealloc, 2632 .errp = errp, 2633 }, 2634 }; 2635 2636 return raw_thread_pool_submit(handle_aiocb_truncate, &acb); 2637 } 2638 2639 static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset, 2640 bool exact, PreallocMode prealloc, 2641 BdrvRequestFlags flags, Error **errp) 2642 { 2643 BDRVRawState *s = bs->opaque; 2644 struct stat st; 2645 int ret; 2646 2647 if (fstat(s->fd, &st)) { 2648 ret = -errno; 2649 error_setg_errno(errp, -ret, "Failed to fstat() the file"); 2650 return ret; 2651 } 2652 2653 if (S_ISREG(st.st_mode)) { 2654 /* Always resizes to the exact @offset */ 2655 return raw_regular_truncate(bs, s->fd, offset, prealloc, errp); 2656 } 2657 2658 if (prealloc != PREALLOC_MODE_OFF) { 2659 error_setg(errp, "Preallocation mode '%s' unsupported for this " 2660 "non-regular file", PreallocMode_str(prealloc)); 2661 return -ENOTSUP; 2662 } 2663 2664 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { 2665 int64_t cur_length = raw_getlength(bs); 2666 2667 if (offset != cur_length && exact) { 2668 error_setg(errp, "Cannot resize device files"); 2669 return -ENOTSUP; 2670 } else if (offset > cur_length) { 2671 error_setg(errp, "Cannot grow device files"); 2672 return -EINVAL; 2673 } 2674 } else { 2675 error_setg(errp, "Resizing this file is not supported"); 2676 return -ENOTSUP; 2677 } 2678 2679 return 0; 2680 } 2681 2682 #ifdef __OpenBSD__ 2683 static int64_t raw_getlength(BlockDriverState *bs) 2684 { 2685 BDRVRawState *s = bs->opaque; 2686 int fd = s->fd; 2687 struct stat st; 2688 2689 if (fstat(fd, &st)) 2690 return -errno; 2691 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { 2692 struct disklabel dl; 2693 2694 if (ioctl(fd, DIOCGDINFO, &dl)) 2695 return -errno; 2696 return (uint64_t)dl.d_secsize * 2697 dl.d_partitions[DISKPART(st.st_rdev)].p_size; 2698 } else 2699 return st.st_size; 2700 } 2701 #elif defined(__NetBSD__) 2702 static int64_t raw_getlength(BlockDriverState *bs) 2703 { 2704 BDRVRawState *s = bs->opaque; 2705 int fd = s->fd; 2706 struct stat st; 2707 2708 if (fstat(fd, &st)) 2709 return -errno; 2710 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { 2711 struct dkwedge_info dkw; 2712 2713 if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) { 2714 return dkw.dkw_size * 512; 2715 } else { 2716 struct disklabel dl; 2717 2718 if (ioctl(fd, DIOCGDINFO, &dl)) 2719 return -errno; 2720 return (uint64_t)dl.d_secsize * 2721 dl.d_partitions[DISKPART(st.st_rdev)].p_size; 2722 } 2723 } else 2724 return st.st_size; 2725 } 2726 #elif defined(__sun__) 2727 static int64_t raw_getlength(BlockDriverState *bs) 2728 { 2729 BDRVRawState *s = bs->opaque; 2730 struct dk_minfo minfo; 2731 int ret; 2732 int64_t size; 2733 2734 ret = fd_open(bs); 2735 if (ret < 0) { 2736 return ret; 2737 } 2738 2739 /* 2740 * Use the DKIOCGMEDIAINFO ioctl to read the size. 2741 */ 2742 ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo); 2743 if (ret != -1) { 2744 return minfo.dki_lbsize * minfo.dki_capacity; 2745 } 2746 2747 /* 2748 * There are reports that lseek on some devices fails, but 2749 * irc discussion said that contingency on contingency was overkill. 2750 */ 2751 size = lseek(s->fd, 0, SEEK_END); 2752 if (size < 0) { 2753 return -errno; 2754 } 2755 return size; 2756 } 2757 #elif defined(CONFIG_BSD) 2758 static int64_t raw_getlength(BlockDriverState *bs) 2759 { 2760 BDRVRawState *s = bs->opaque; 2761 int fd = s->fd; 2762 int64_t size; 2763 struct stat sb; 2764 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) 2765 int reopened = 0; 2766 #endif 2767 int ret; 2768 2769 ret = fd_open(bs); 2770 if (ret < 0) 2771 return ret; 2772 2773 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) 2774 again: 2775 #endif 2776 if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) { 2777 size = 0; 2778 #ifdef DIOCGMEDIASIZE 2779 if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size)) { 2780 size = 0; 2781 } 2782 #endif 2783 #ifdef DIOCGPART 2784 if (size == 0) { 2785 struct partinfo pi; 2786 if (ioctl(fd, DIOCGPART, &pi) == 0) { 2787 size = pi.media_size; 2788 } 2789 } 2790 #endif 2791 #if defined(DKIOCGETBLOCKCOUNT) && defined(DKIOCGETBLOCKSIZE) 2792 if (size == 0) { 2793 uint64_t sectors = 0; 2794 uint32_t sector_size = 0; 2795 2796 if (ioctl(fd, DKIOCGETBLOCKCOUNT, §ors) == 0 2797 && ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) == 0) { 2798 size = sectors * sector_size; 2799 } 2800 } 2801 #endif 2802 if (size == 0) { 2803 size = lseek(fd, 0LL, SEEK_END); 2804 } 2805 if (size < 0) { 2806 return -errno; 2807 } 2808 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 2809 switch(s->type) { 2810 case FTYPE_CD: 2811 /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */ 2812 if (size == 2048LL * (unsigned)-1) 2813 size = 0; 2814 /* XXX no disc? maybe we need to reopen... */ 2815 if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) { 2816 reopened = 1; 2817 goto again; 2818 } 2819 } 2820 #endif 2821 } else { 2822 size = lseek(fd, 0, SEEK_END); 2823 if (size < 0) { 2824 return -errno; 2825 } 2826 } 2827 return size; 2828 } 2829 #else 2830 static int64_t raw_getlength(BlockDriverState *bs) 2831 { 2832 BDRVRawState *s = bs->opaque; 2833 int ret; 2834 int64_t size; 2835 2836 ret = fd_open(bs); 2837 if (ret < 0) { 2838 return ret; 2839 } 2840 2841 size = lseek(s->fd, 0, SEEK_END); 2842 if (size < 0) { 2843 return -errno; 2844 } 2845 return size; 2846 } 2847 #endif 2848 2849 static int64_t coroutine_fn raw_co_getlength(BlockDriverState *bs) 2850 { 2851 return raw_getlength(bs); 2852 } 2853 2854 static int64_t coroutine_fn raw_co_get_allocated_file_size(BlockDriverState *bs) 2855 { 2856 struct stat st; 2857 BDRVRawState *s = bs->opaque; 2858 2859 if (fstat(s->fd, &st) < 0) { 2860 return -errno; 2861 } 2862 return (int64_t)st.st_blocks * 512; 2863 } 2864 2865 static int coroutine_fn 2866 raw_co_create(BlockdevCreateOptions *options, Error **errp) 2867 { 2868 BlockdevCreateOptionsFile *file_opts; 2869 Error *local_err = NULL; 2870 int fd; 2871 uint64_t perm, shared; 2872 int result = 0; 2873 2874 /* Validate options and set default values */ 2875 assert(options->driver == BLOCKDEV_DRIVER_FILE); 2876 file_opts = &options->u.file; 2877 2878 if (!file_opts->has_nocow) { 2879 file_opts->nocow = false; 2880 } 2881 if (!file_opts->has_preallocation) { 2882 file_opts->preallocation = PREALLOC_MODE_OFF; 2883 } 2884 if (!file_opts->has_extent_size_hint) { 2885 file_opts->extent_size_hint = 1 * MiB; 2886 } 2887 if (file_opts->extent_size_hint > UINT32_MAX) { 2888 result = -EINVAL; 2889 error_setg(errp, "Extent size hint is too large"); 2890 goto out; 2891 } 2892 2893 /* Create file */ 2894 fd = qemu_create(file_opts->filename, O_RDWR | O_BINARY, 0644, errp); 2895 if (fd < 0) { 2896 result = -errno; 2897 goto out; 2898 } 2899 2900 /* Take permissions: We want to discard everything, so we need 2901 * BLK_PERM_WRITE; and truncation to the desired size requires 2902 * BLK_PERM_RESIZE. 2903 * On the other hand, we cannot share the RESIZE permission 2904 * because we promise that after this function, the file has the 2905 * size given in the options. If someone else were to resize it 2906 * concurrently, we could not guarantee that. 2907 * Note that after this function, we can no longer guarantee that 2908 * the file is not touched by a third party, so it may be resized 2909 * then. */ 2910 perm = BLK_PERM_WRITE | BLK_PERM_RESIZE; 2911 shared = BLK_PERM_ALL & ~BLK_PERM_RESIZE; 2912 2913 /* Step one: Take locks */ 2914 result = raw_apply_lock_bytes(NULL, fd, perm, ~shared, false, errp); 2915 if (result < 0) { 2916 goto out_close; 2917 } 2918 2919 /* Step two: Check that nobody else has taken conflicting locks */ 2920 result = raw_check_lock_bytes(fd, perm, shared, errp); 2921 if (result < 0) { 2922 error_append_hint(errp, 2923 "Is another process using the image [%s]?\n", 2924 file_opts->filename); 2925 goto out_unlock; 2926 } 2927 2928 /* Clear the file by truncating it to 0 */ 2929 result = raw_regular_truncate(NULL, fd, 0, PREALLOC_MODE_OFF, errp); 2930 if (result < 0) { 2931 goto out_unlock; 2932 } 2933 2934 if (file_opts->nocow) { 2935 #ifdef __linux__ 2936 /* Set NOCOW flag to solve performance issue on fs like btrfs. 2937 * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value 2938 * will be ignored since any failure of this operation should not 2939 * block the left work. 2940 */ 2941 int attr; 2942 if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) { 2943 attr |= FS_NOCOW_FL; 2944 ioctl(fd, FS_IOC_SETFLAGS, &attr); 2945 } 2946 #endif 2947 } 2948 #ifdef FS_IOC_FSSETXATTR 2949 /* 2950 * Try to set the extent size hint. Failure is not fatal, and a warning is 2951 * only printed if the option was explicitly specified. 2952 */ 2953 { 2954 struct fsxattr attr; 2955 result = ioctl(fd, FS_IOC_FSGETXATTR, &attr); 2956 if (result == 0) { 2957 attr.fsx_xflags |= FS_XFLAG_EXTSIZE; 2958 attr.fsx_extsize = file_opts->extent_size_hint; 2959 result = ioctl(fd, FS_IOC_FSSETXATTR, &attr); 2960 } 2961 if (result < 0 && file_opts->has_extent_size_hint && 2962 file_opts->extent_size_hint) 2963 { 2964 warn_report("Failed to set extent size hint: %s", 2965 strerror(errno)); 2966 } 2967 } 2968 #endif 2969 2970 /* Resize and potentially preallocate the file to the desired 2971 * final size */ 2972 result = raw_regular_truncate(NULL, fd, file_opts->size, 2973 file_opts->preallocation, errp); 2974 if (result < 0) { 2975 goto out_unlock; 2976 } 2977 2978 out_unlock: 2979 raw_apply_lock_bytes(NULL, fd, 0, 0, true, &local_err); 2980 if (local_err) { 2981 /* The above call should not fail, and if it does, that does 2982 * not mean the whole creation operation has failed. So 2983 * report it the user for their convenience, but do not report 2984 * it to the caller. */ 2985 warn_report_err(local_err); 2986 } 2987 2988 out_close: 2989 if (qemu_close(fd) != 0 && result == 0) { 2990 result = -errno; 2991 error_setg_errno(errp, -result, "Could not close the new file"); 2992 } 2993 out: 2994 return result; 2995 } 2996 2997 static int coroutine_fn GRAPH_RDLOCK 2998 raw_co_create_opts(BlockDriver *drv, const char *filename, 2999 QemuOpts *opts, Error **errp) 3000 { 3001 BlockdevCreateOptions options; 3002 int64_t total_size = 0; 3003 int64_t extent_size_hint = 0; 3004 bool has_extent_size_hint = false; 3005 bool nocow = false; 3006 PreallocMode prealloc; 3007 char *buf = NULL; 3008 Error *local_err = NULL; 3009 3010 /* Skip file: protocol prefix */ 3011 strstart(filename, "file:", &filename); 3012 3013 /* Read out options */ 3014 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 3015 BDRV_SECTOR_SIZE); 3016 if (qemu_opt_get(opts, BLOCK_OPT_EXTENT_SIZE_HINT)) { 3017 has_extent_size_hint = true; 3018 extent_size_hint = 3019 qemu_opt_get_size_del(opts, BLOCK_OPT_EXTENT_SIZE_HINT, -1); 3020 } 3021 nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false); 3022 buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); 3023 prealloc = qapi_enum_parse(&PreallocMode_lookup, buf, 3024 PREALLOC_MODE_OFF, &local_err); 3025 g_free(buf); 3026 if (local_err) { 3027 error_propagate(errp, local_err); 3028 return -EINVAL; 3029 } 3030 3031 options = (BlockdevCreateOptions) { 3032 .driver = BLOCKDEV_DRIVER_FILE, 3033 .u.file = { 3034 .filename = (char *) filename, 3035 .size = total_size, 3036 .has_preallocation = true, 3037 .preallocation = prealloc, 3038 .has_nocow = true, 3039 .nocow = nocow, 3040 .has_extent_size_hint = has_extent_size_hint, 3041 .extent_size_hint = extent_size_hint, 3042 }, 3043 }; 3044 return raw_co_create(&options, errp); 3045 } 3046 3047 static int coroutine_fn raw_co_delete_file(BlockDriverState *bs, 3048 Error **errp) 3049 { 3050 struct stat st; 3051 int ret; 3052 3053 if (!(stat(bs->filename, &st) == 0) || !S_ISREG(st.st_mode)) { 3054 error_setg_errno(errp, ENOENT, "%s is not a regular file", 3055 bs->filename); 3056 return -ENOENT; 3057 } 3058 3059 ret = unlink(bs->filename); 3060 if (ret < 0) { 3061 ret = -errno; 3062 error_setg_errno(errp, -ret, "Error when deleting file %s", 3063 bs->filename); 3064 } 3065 3066 return ret; 3067 } 3068 3069 /* 3070 * Find allocation range in @bs around offset @start. 3071 * May change underlying file descriptor's file offset. 3072 * If @start is not in a hole, store @start in @data, and the 3073 * beginning of the next hole in @hole, and return 0. 3074 * If @start is in a non-trailing hole, store @start in @hole and the 3075 * beginning of the next non-hole in @data, and return 0. 3076 * If @start is in a trailing hole or beyond EOF, return -ENXIO. 3077 * If we can't find out, return a negative errno other than -ENXIO. 3078 */ 3079 static int find_allocation(BlockDriverState *bs, off_t start, 3080 off_t *data, off_t *hole) 3081 { 3082 #if defined SEEK_HOLE && defined SEEK_DATA 3083 BDRVRawState *s = bs->opaque; 3084 off_t offs; 3085 3086 /* 3087 * SEEK_DATA cases: 3088 * D1. offs == start: start is in data 3089 * D2. offs > start: start is in a hole, next data at offs 3090 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole 3091 * or start is beyond EOF 3092 * If the latter happens, the file has been truncated behind 3093 * our back since we opened it. All bets are off then. 3094 * Treating like a trailing hole is simplest. 3095 * D4. offs < 0, errno != ENXIO: we learned nothing 3096 */ 3097 offs = lseek(s->fd, start, SEEK_DATA); 3098 if (offs < 0) { 3099 return -errno; /* D3 or D4 */ 3100 } 3101 3102 if (offs < start) { 3103 /* This is not a valid return by lseek(). We are safe to just return 3104 * -EIO in this case, and we'll treat it like D4. */ 3105 return -EIO; 3106 } 3107 3108 if (offs > start) { 3109 /* D2: in hole, next data at offs */ 3110 *hole = start; 3111 *data = offs; 3112 return 0; 3113 } 3114 3115 /* D1: in data, end not yet known */ 3116 3117 /* 3118 * SEEK_HOLE cases: 3119 * H1. offs == start: start is in a hole 3120 * If this happens here, a hole has been dug behind our back 3121 * since the previous lseek(). 3122 * H2. offs > start: either start is in data, next hole at offs, 3123 * or start is in trailing hole, EOF at offs 3124 * Linux treats trailing holes like any other hole: offs == 3125 * start. Solaris seeks to EOF instead: offs > start (blech). 3126 * If that happens here, a hole has been dug behind our back 3127 * since the previous lseek(). 3128 * H3. offs < 0, errno = ENXIO: start is beyond EOF 3129 * If this happens, the file has been truncated behind our 3130 * back since we opened it. Treat it like a trailing hole. 3131 * H4. offs < 0, errno != ENXIO: we learned nothing 3132 * Pretend we know nothing at all, i.e. "forget" about D1. 3133 */ 3134 offs = lseek(s->fd, start, SEEK_HOLE); 3135 if (offs < 0) { 3136 return -errno; /* D1 and (H3 or H4) */ 3137 } 3138 3139 if (offs < start) { 3140 /* This is not a valid return by lseek(). We are safe to just return 3141 * -EIO in this case, and we'll treat it like H4. */ 3142 return -EIO; 3143 } 3144 3145 if (offs > start) { 3146 /* 3147 * D1 and H2: either in data, next hole at offs, or it was in 3148 * data but is now in a trailing hole. In the latter case, 3149 * all bets are off. Treating it as if it there was data all 3150 * the way to EOF is safe, so simply do that. 3151 */ 3152 *data = start; 3153 *hole = offs; 3154 return 0; 3155 } 3156 3157 /* D1 and H1 */ 3158 return -EBUSY; 3159 #else 3160 return -ENOTSUP; 3161 #endif 3162 } 3163 3164 /* 3165 * Returns the allocation status of the specified offset. 3166 * 3167 * The block layer guarantees 'offset' and 'bytes' are within bounds. 3168 * 3169 * 'pnum' is set to the number of bytes (including and immediately following 3170 * the specified offset) that are known to be in the same 3171 * allocated/unallocated state. 3172 * 3173 * 'bytes' is a soft cap for 'pnum'. If the information is free, 'pnum' may 3174 * well exceed it. 3175 */ 3176 static int coroutine_fn raw_co_block_status(BlockDriverState *bs, 3177 bool want_zero, 3178 int64_t offset, 3179 int64_t bytes, int64_t *pnum, 3180 int64_t *map, 3181 BlockDriverState **file) 3182 { 3183 off_t data = 0, hole = 0; 3184 int ret; 3185 3186 assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment)); 3187 3188 ret = fd_open(bs); 3189 if (ret < 0) { 3190 return ret; 3191 } 3192 3193 if (!want_zero) { 3194 *pnum = bytes; 3195 *map = offset; 3196 *file = bs; 3197 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 3198 } 3199 3200 ret = find_allocation(bs, offset, &data, &hole); 3201 if (ret == -ENXIO) { 3202 /* Trailing hole */ 3203 *pnum = bytes; 3204 ret = BDRV_BLOCK_ZERO; 3205 } else if (ret < 0) { 3206 /* No info available, so pretend there are no holes */ 3207 *pnum = bytes; 3208 ret = BDRV_BLOCK_DATA; 3209 } else if (data == offset) { 3210 /* On a data extent, compute bytes to the end of the extent, 3211 * possibly including a partial sector at EOF. */ 3212 *pnum = hole - offset; 3213 3214 /* 3215 * We are not allowed to return partial sectors, though, so 3216 * round up if necessary. 3217 */ 3218 if (!QEMU_IS_ALIGNED(*pnum, bs->bl.request_alignment)) { 3219 int64_t file_length = raw_getlength(bs); 3220 if (file_length > 0) { 3221 /* Ignore errors, this is just a safeguard */ 3222 assert(hole == file_length); 3223 } 3224 *pnum = ROUND_UP(*pnum, bs->bl.request_alignment); 3225 } 3226 3227 ret = BDRV_BLOCK_DATA; 3228 } else { 3229 /* On a hole, compute bytes to the beginning of the next extent. */ 3230 assert(hole == offset); 3231 *pnum = data - offset; 3232 ret = BDRV_BLOCK_ZERO; 3233 } 3234 *map = offset; 3235 *file = bs; 3236 return ret | BDRV_BLOCK_OFFSET_VALID; 3237 } 3238 3239 #if defined(__linux__) 3240 /* Verify that the file is not in the page cache */ 3241 static void check_cache_dropped(BlockDriverState *bs, Error **errp) 3242 { 3243 const size_t window_size = 128 * 1024 * 1024; 3244 BDRVRawState *s = bs->opaque; 3245 void *window = NULL; 3246 size_t length = 0; 3247 unsigned char *vec; 3248 size_t page_size; 3249 off_t offset; 3250 off_t end; 3251 3252 /* mincore(2) page status information requires 1 byte per page */ 3253 page_size = sysconf(_SC_PAGESIZE); 3254 vec = g_malloc(DIV_ROUND_UP(window_size, page_size)); 3255 3256 end = raw_getlength(bs); 3257 3258 for (offset = 0; offset < end; offset += window_size) { 3259 void *new_window; 3260 size_t new_length; 3261 size_t vec_end; 3262 size_t i; 3263 int ret; 3264 3265 /* Unmap previous window if size has changed */ 3266 new_length = MIN(end - offset, window_size); 3267 if (new_length != length) { 3268 munmap(window, length); 3269 window = NULL; 3270 length = 0; 3271 } 3272 3273 new_window = mmap(window, new_length, PROT_NONE, MAP_PRIVATE, 3274 s->fd, offset); 3275 if (new_window == MAP_FAILED) { 3276 error_setg_errno(errp, errno, "mmap failed"); 3277 break; 3278 } 3279 3280 window = new_window; 3281 length = new_length; 3282 3283 ret = mincore(window, length, vec); 3284 if (ret < 0) { 3285 error_setg_errno(errp, errno, "mincore failed"); 3286 break; 3287 } 3288 3289 vec_end = DIV_ROUND_UP(length, page_size); 3290 for (i = 0; i < vec_end; i++) { 3291 if (vec[i] & 0x1) { 3292 break; 3293 } 3294 } 3295 if (i < vec_end) { 3296 error_setg(errp, "page cache still in use!"); 3297 break; 3298 } 3299 } 3300 3301 if (window) { 3302 munmap(window, length); 3303 } 3304 3305 g_free(vec); 3306 } 3307 #endif /* __linux__ */ 3308 3309 static void coroutine_fn GRAPH_RDLOCK 3310 raw_co_invalidate_cache(BlockDriverState *bs, Error **errp) 3311 { 3312 BDRVRawState *s = bs->opaque; 3313 int ret; 3314 3315 ret = fd_open(bs); 3316 if (ret < 0) { 3317 error_setg_errno(errp, -ret, "The file descriptor is not open"); 3318 return; 3319 } 3320 3321 if (!s->drop_cache) { 3322 return; 3323 } 3324 3325 if (s->open_flags & O_DIRECT) { 3326 return; /* No host kernel page cache */ 3327 } 3328 3329 #if defined(__linux__) 3330 /* This sets the scene for the next syscall... */ 3331 ret = bdrv_co_flush(bs); 3332 if (ret < 0) { 3333 error_setg_errno(errp, -ret, "flush failed"); 3334 return; 3335 } 3336 3337 /* Linux does not invalidate pages that are dirty, locked, or mmapped by a 3338 * process. These limitations are okay because we just fsynced the file, 3339 * we don't use mmap, and the file should not be in use by other processes. 3340 */ 3341 ret = posix_fadvise(s->fd, 0, 0, POSIX_FADV_DONTNEED); 3342 if (ret != 0) { /* the return value is a positive errno */ 3343 error_setg_errno(errp, ret, "fadvise failed"); 3344 return; 3345 } 3346 3347 if (s->check_cache_dropped) { 3348 check_cache_dropped(bs, errp); 3349 } 3350 #else /* __linux__ */ 3351 /* Do nothing. Live migration to a remote host with cache.direct=off is 3352 * unsupported on other host operating systems. Cache consistency issues 3353 * may occur but no error is reported here, partly because that's the 3354 * historical behavior and partly because it's hard to differentiate valid 3355 * configurations that should not cause errors. 3356 */ 3357 #endif /* !__linux__ */ 3358 } 3359 3360 static void raw_account_discard(BDRVRawState *s, uint64_t nbytes, int ret) 3361 { 3362 if (ret) { 3363 s->stats.discard_nb_failed++; 3364 } else { 3365 s->stats.discard_nb_ok++; 3366 s->stats.discard_bytes_ok += nbytes; 3367 } 3368 } 3369 3370 /* 3371 * zone report - Get a zone block device's information in the form 3372 * of an array of zone descriptors. 3373 * zones is an array of zone descriptors to hold zone information on reply; 3374 * offset can be any byte within the entire size of the device; 3375 * nr_zones is the maximum number of sectors the command should operate on. 3376 */ 3377 #if defined(CONFIG_BLKZONED) 3378 static int coroutine_fn raw_co_zone_report(BlockDriverState *bs, int64_t offset, 3379 unsigned int *nr_zones, 3380 BlockZoneDescriptor *zones) { 3381 BDRVRawState *s = bs->opaque; 3382 RawPosixAIOData acb = (RawPosixAIOData) { 3383 .bs = bs, 3384 .aio_fildes = s->fd, 3385 .aio_type = QEMU_AIO_ZONE_REPORT, 3386 .aio_offset = offset, 3387 .zone_report = { 3388 .nr_zones = nr_zones, 3389 .zones = zones, 3390 }, 3391 }; 3392 3393 trace_zbd_zone_report(bs, *nr_zones, offset >> BDRV_SECTOR_BITS); 3394 return raw_thread_pool_submit(handle_aiocb_zone_report, &acb); 3395 } 3396 #endif 3397 3398 /* 3399 * zone management operations - Execute an operation on a zone 3400 */ 3401 #if defined(CONFIG_BLKZONED) 3402 static int coroutine_fn raw_co_zone_mgmt(BlockDriverState *bs, BlockZoneOp op, 3403 int64_t offset, int64_t len) { 3404 BDRVRawState *s = bs->opaque; 3405 RawPosixAIOData acb; 3406 int64_t zone_size, zone_size_mask; 3407 const char *op_name; 3408 unsigned long zo; 3409 int ret; 3410 BlockZoneWps *wps = bs->wps; 3411 int64_t capacity = bs->total_sectors << BDRV_SECTOR_BITS; 3412 3413 zone_size = bs->bl.zone_size; 3414 zone_size_mask = zone_size - 1; 3415 if (offset & zone_size_mask) { 3416 error_report("sector offset %" PRId64 " is not aligned to zone size " 3417 "%" PRId64 "", offset / 512, zone_size / 512); 3418 return -EINVAL; 3419 } 3420 3421 if (((offset + len) < capacity && len & zone_size_mask) || 3422 offset + len > capacity) { 3423 error_report("number of sectors %" PRId64 " is not aligned to zone size" 3424 " %" PRId64 "", len / 512, zone_size / 512); 3425 return -EINVAL; 3426 } 3427 3428 uint32_t i = offset / bs->bl.zone_size; 3429 uint32_t nrz = len / bs->bl.zone_size; 3430 uint64_t *wp = &wps->wp[i]; 3431 if (BDRV_ZT_IS_CONV(*wp) && len != capacity) { 3432 error_report("zone mgmt operations are not allowed for conventional zones"); 3433 return -EIO; 3434 } 3435 3436 switch (op) { 3437 case BLK_ZO_OPEN: 3438 op_name = "BLKOPENZONE"; 3439 zo = BLKOPENZONE; 3440 break; 3441 case BLK_ZO_CLOSE: 3442 op_name = "BLKCLOSEZONE"; 3443 zo = BLKCLOSEZONE; 3444 break; 3445 case BLK_ZO_FINISH: 3446 op_name = "BLKFINISHZONE"; 3447 zo = BLKFINISHZONE; 3448 break; 3449 case BLK_ZO_RESET: 3450 op_name = "BLKRESETZONE"; 3451 zo = BLKRESETZONE; 3452 break; 3453 default: 3454 error_report("Unsupported zone op: 0x%x", op); 3455 return -ENOTSUP; 3456 } 3457 3458 acb = (RawPosixAIOData) { 3459 .bs = bs, 3460 .aio_fildes = s->fd, 3461 .aio_type = QEMU_AIO_ZONE_MGMT, 3462 .aio_offset = offset, 3463 .aio_nbytes = len, 3464 .zone_mgmt = { 3465 .op = zo, 3466 }, 3467 }; 3468 3469 trace_zbd_zone_mgmt(bs, op_name, offset >> BDRV_SECTOR_BITS, 3470 len >> BDRV_SECTOR_BITS); 3471 ret = raw_thread_pool_submit(handle_aiocb_zone_mgmt, &acb); 3472 if (ret != 0) { 3473 update_zones_wp(bs, s->fd, offset, i); 3474 error_report("ioctl %s failed %d", op_name, ret); 3475 return ret; 3476 } 3477 3478 if (zo == BLKRESETZONE && len == capacity) { 3479 ret = get_zones_wp(bs, s->fd, 0, bs->bl.nr_zones, 1); 3480 if (ret < 0) { 3481 error_report("reporting single wp failed"); 3482 return ret; 3483 } 3484 } else if (zo == BLKRESETZONE) { 3485 for (unsigned int j = 0; j < nrz; ++j) { 3486 wp[j] = offset + j * zone_size; 3487 } 3488 } else if (zo == BLKFINISHZONE) { 3489 for (unsigned int j = 0; j < nrz; ++j) { 3490 /* The zoned device allows the last zone smaller that the 3491 * zone size. */ 3492 wp[j] = MIN(offset + (j + 1) * zone_size, offset + len); 3493 } 3494 } 3495 3496 return ret; 3497 } 3498 #endif 3499 3500 #if defined(CONFIG_BLKZONED) 3501 static int coroutine_fn raw_co_zone_append(BlockDriverState *bs, 3502 int64_t *offset, 3503 QEMUIOVector *qiov, 3504 BdrvRequestFlags flags) { 3505 assert(flags == 0); 3506 int64_t zone_size_mask = bs->bl.zone_size - 1; 3507 int64_t iov_len = 0; 3508 int64_t len = 0; 3509 BDRVRawState *s = bs->opaque; 3510 s->offset = offset; 3511 3512 if (*offset & zone_size_mask) { 3513 error_report("sector offset %" PRId64 " is not aligned to zone size " 3514 "%" PRId32 "", *offset / 512, bs->bl.zone_size / 512); 3515 return -EINVAL; 3516 } 3517 3518 int64_t wg = bs->bl.write_granularity; 3519 int64_t wg_mask = wg - 1; 3520 for (int i = 0; i < qiov->niov; i++) { 3521 iov_len = qiov->iov[i].iov_len; 3522 if (iov_len & wg_mask) { 3523 error_report("len of IOVector[%d] %" PRId64 " is not aligned to " 3524 "block size %" PRId64 "", i, iov_len, wg); 3525 return -EINVAL; 3526 } 3527 len += iov_len; 3528 } 3529 3530 trace_zbd_zone_append(bs, *offset >> BDRV_SECTOR_BITS); 3531 return raw_co_prw(bs, *offset, len, qiov, QEMU_AIO_ZONE_APPEND); 3532 } 3533 #endif 3534 3535 static coroutine_fn int 3536 raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes, 3537 bool blkdev) 3538 { 3539 BDRVRawState *s = bs->opaque; 3540 RawPosixAIOData acb; 3541 int ret; 3542 3543 acb = (RawPosixAIOData) { 3544 .bs = bs, 3545 .aio_fildes = s->fd, 3546 .aio_type = QEMU_AIO_DISCARD, 3547 .aio_offset = offset, 3548 .aio_nbytes = bytes, 3549 }; 3550 3551 if (blkdev) { 3552 acb.aio_type |= QEMU_AIO_BLKDEV; 3553 } 3554 3555 ret = raw_thread_pool_submit(handle_aiocb_discard, &acb); 3556 raw_account_discard(s, bytes, ret); 3557 return ret; 3558 } 3559 3560 static coroutine_fn int 3561 raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) 3562 { 3563 return raw_do_pdiscard(bs, offset, bytes, false); 3564 } 3565 3566 static int coroutine_fn 3567 raw_do_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, 3568 BdrvRequestFlags flags, bool blkdev) 3569 { 3570 BDRVRawState *s = bs->opaque; 3571 RawPosixAIOData acb; 3572 ThreadPoolFunc *handler; 3573 3574 #ifdef CONFIG_FALLOCATE 3575 if (offset + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) { 3576 BdrvTrackedRequest *req; 3577 3578 /* 3579 * This is a workaround for a bug in the Linux XFS driver, 3580 * where writes submitted through the AIO interface will be 3581 * discarded if they happen beyond a concurrently running 3582 * fallocate() that increases the file length (i.e., both the 3583 * write and the fallocate() happen beyond the EOF). 3584 * 3585 * To work around it, we extend the tracked request for this 3586 * zero write until INT64_MAX (effectively infinity), and mark 3587 * it as serializing. 3588 * 3589 * We have to enable this workaround for all filesystems and 3590 * AIO modes (not just XFS with aio=native), because for 3591 * remote filesystems we do not know the host configuration. 3592 */ 3593 3594 req = bdrv_co_get_self_request(bs); 3595 assert(req); 3596 assert(req->type == BDRV_TRACKED_WRITE); 3597 assert(req->offset <= offset); 3598 assert(req->offset + req->bytes >= offset + bytes); 3599 3600 req->bytes = BDRV_MAX_LENGTH - req->offset; 3601 3602 bdrv_check_request(req->offset, req->bytes, &error_abort); 3603 3604 bdrv_make_request_serialising(req, bs->bl.request_alignment); 3605 } 3606 #endif 3607 3608 acb = (RawPosixAIOData) { 3609 .bs = bs, 3610 .aio_fildes = s->fd, 3611 .aio_type = QEMU_AIO_WRITE_ZEROES, 3612 .aio_offset = offset, 3613 .aio_nbytes = bytes, 3614 }; 3615 3616 if (blkdev) { 3617 acb.aio_type |= QEMU_AIO_BLKDEV; 3618 } 3619 if (flags & BDRV_REQ_NO_FALLBACK) { 3620 acb.aio_type |= QEMU_AIO_NO_FALLBACK; 3621 } 3622 3623 if (flags & BDRV_REQ_MAY_UNMAP) { 3624 acb.aio_type |= QEMU_AIO_DISCARD; 3625 handler = handle_aiocb_write_zeroes_unmap; 3626 } else { 3627 handler = handle_aiocb_write_zeroes; 3628 } 3629 3630 return raw_thread_pool_submit(handler, &acb); 3631 } 3632 3633 static int coroutine_fn raw_co_pwrite_zeroes( 3634 BlockDriverState *bs, int64_t offset, 3635 int64_t bytes, BdrvRequestFlags flags) 3636 { 3637 return raw_do_pwrite_zeroes(bs, offset, bytes, flags, false); 3638 } 3639 3640 static int coroutine_fn 3641 raw_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 3642 { 3643 return 0; 3644 } 3645 3646 static ImageInfoSpecific *raw_get_specific_info(BlockDriverState *bs, 3647 Error **errp) 3648 { 3649 ImageInfoSpecificFile *file_info = g_new0(ImageInfoSpecificFile, 1); 3650 ImageInfoSpecific *spec_info = g_new(ImageInfoSpecific, 1); 3651 3652 *spec_info = (ImageInfoSpecific){ 3653 .type = IMAGE_INFO_SPECIFIC_KIND_FILE, 3654 .u.file.data = file_info, 3655 }; 3656 3657 #ifdef FS_IOC_FSGETXATTR 3658 { 3659 BDRVRawState *s = bs->opaque; 3660 struct fsxattr attr; 3661 int ret; 3662 3663 ret = ioctl(s->fd, FS_IOC_FSGETXATTR, &attr); 3664 if (!ret && attr.fsx_extsize != 0) { 3665 file_info->has_extent_size_hint = true; 3666 file_info->extent_size_hint = attr.fsx_extsize; 3667 } 3668 } 3669 #endif 3670 3671 return spec_info; 3672 } 3673 3674 static BlockStatsSpecificFile get_blockstats_specific_file(BlockDriverState *bs) 3675 { 3676 BDRVRawState *s = bs->opaque; 3677 return (BlockStatsSpecificFile) { 3678 .discard_nb_ok = s->stats.discard_nb_ok, 3679 .discard_nb_failed = s->stats.discard_nb_failed, 3680 .discard_bytes_ok = s->stats.discard_bytes_ok, 3681 }; 3682 } 3683 3684 static BlockStatsSpecific *raw_get_specific_stats(BlockDriverState *bs) 3685 { 3686 BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1); 3687 3688 stats->driver = BLOCKDEV_DRIVER_FILE; 3689 stats->u.file = get_blockstats_specific_file(bs); 3690 3691 return stats; 3692 } 3693 3694 #if defined(HAVE_HOST_BLOCK_DEVICE) 3695 static BlockStatsSpecific *hdev_get_specific_stats(BlockDriverState *bs) 3696 { 3697 BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1); 3698 3699 stats->driver = BLOCKDEV_DRIVER_HOST_DEVICE; 3700 stats->u.host_device = get_blockstats_specific_file(bs); 3701 3702 return stats; 3703 } 3704 #endif /* HAVE_HOST_BLOCK_DEVICE */ 3705 3706 static QemuOptsList raw_create_opts = { 3707 .name = "raw-create-opts", 3708 .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head), 3709 .desc = { 3710 { 3711 .name = BLOCK_OPT_SIZE, 3712 .type = QEMU_OPT_SIZE, 3713 .help = "Virtual disk size" 3714 }, 3715 { 3716 .name = BLOCK_OPT_NOCOW, 3717 .type = QEMU_OPT_BOOL, 3718 .help = "Turn off copy-on-write (valid only on btrfs)" 3719 }, 3720 { 3721 .name = BLOCK_OPT_PREALLOC, 3722 .type = QEMU_OPT_STRING, 3723 .help = "Preallocation mode (allowed values: off" 3724 #ifdef CONFIG_POSIX_FALLOCATE 3725 ", falloc" 3726 #endif 3727 ", full)" 3728 }, 3729 { 3730 .name = BLOCK_OPT_EXTENT_SIZE_HINT, 3731 .type = QEMU_OPT_SIZE, 3732 .help = "Extent size hint for the image file, 0 to disable" 3733 }, 3734 { /* end of list */ } 3735 } 3736 }; 3737 3738 static int raw_check_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared, 3739 Error **errp) 3740 { 3741 BDRVRawState *s = bs->opaque; 3742 int input_flags = s->reopen_state ? s->reopen_state->flags : bs->open_flags; 3743 int open_flags; 3744 int ret; 3745 3746 /* We may need a new fd if auto-read-only switches the mode */ 3747 ret = raw_reconfigure_getfd(bs, input_flags, &open_flags, perm, 3748 false, errp); 3749 if (ret < 0) { 3750 return ret; 3751 } else if (ret != s->fd) { 3752 Error *local_err = NULL; 3753 3754 /* 3755 * Fail already check_perm() if we can't get a working O_DIRECT 3756 * alignment with the new fd. 3757 */ 3758 raw_probe_alignment(bs, ret, &local_err); 3759 if (local_err) { 3760 error_propagate(errp, local_err); 3761 return -EINVAL; 3762 } 3763 3764 s->perm_change_fd = ret; 3765 s->perm_change_flags = open_flags; 3766 } 3767 3768 /* Prepare permissions on old fd to avoid conflicts between old and new, 3769 * but keep everything locked that new will need. */ 3770 ret = raw_handle_perm_lock(bs, RAW_PL_PREPARE, perm, shared, errp); 3771 if (ret < 0) { 3772 goto fail; 3773 } 3774 3775 /* Copy locks to the new fd */ 3776 if (s->perm_change_fd && s->use_lock) { 3777 ret = raw_apply_lock_bytes(NULL, s->perm_change_fd, perm, ~shared, 3778 false, errp); 3779 if (ret < 0) { 3780 raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL); 3781 goto fail; 3782 } 3783 } 3784 return 0; 3785 3786 fail: 3787 if (s->perm_change_fd) { 3788 qemu_close(s->perm_change_fd); 3789 } 3790 s->perm_change_fd = 0; 3791 return ret; 3792 } 3793 3794 static void raw_set_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared) 3795 { 3796 BDRVRawState *s = bs->opaque; 3797 3798 /* For reopen, we have already switched to the new fd (.bdrv_set_perm is 3799 * called after .bdrv_reopen_commit) */ 3800 if (s->perm_change_fd && s->fd != s->perm_change_fd) { 3801 qemu_close(s->fd); 3802 s->fd = s->perm_change_fd; 3803 s->open_flags = s->perm_change_flags; 3804 } 3805 s->perm_change_fd = 0; 3806 3807 raw_handle_perm_lock(bs, RAW_PL_COMMIT, perm, shared, NULL); 3808 s->perm = perm; 3809 s->shared_perm = shared; 3810 } 3811 3812 static void raw_abort_perm_update(BlockDriverState *bs) 3813 { 3814 BDRVRawState *s = bs->opaque; 3815 3816 /* For reopen, .bdrv_reopen_abort is called afterwards and will close 3817 * the file descriptor. */ 3818 if (s->perm_change_fd) { 3819 qemu_close(s->perm_change_fd); 3820 } 3821 s->perm_change_fd = 0; 3822 3823 raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL); 3824 } 3825 3826 static int coroutine_fn GRAPH_RDLOCK raw_co_copy_range_from( 3827 BlockDriverState *bs, BdrvChild *src, int64_t src_offset, 3828 BdrvChild *dst, int64_t dst_offset, int64_t bytes, 3829 BdrvRequestFlags read_flags, BdrvRequestFlags write_flags) 3830 { 3831 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 3832 read_flags, write_flags); 3833 } 3834 3835 static int coroutine_fn GRAPH_RDLOCK 3836 raw_co_copy_range_to(BlockDriverState *bs, 3837 BdrvChild *src, int64_t src_offset, 3838 BdrvChild *dst, int64_t dst_offset, 3839 int64_t bytes, BdrvRequestFlags read_flags, 3840 BdrvRequestFlags write_flags) 3841 { 3842 RawPosixAIOData acb; 3843 BDRVRawState *s = bs->opaque; 3844 BDRVRawState *src_s; 3845 3846 assert(dst->bs == bs); 3847 if (src->bs->drv->bdrv_co_copy_range_to != raw_co_copy_range_to) { 3848 return -ENOTSUP; 3849 } 3850 3851 src_s = src->bs->opaque; 3852 if (fd_open(src->bs) < 0 || fd_open(dst->bs) < 0) { 3853 return -EIO; 3854 } 3855 3856 acb = (RawPosixAIOData) { 3857 .bs = bs, 3858 .aio_type = QEMU_AIO_COPY_RANGE, 3859 .aio_fildes = src_s->fd, 3860 .aio_offset = src_offset, 3861 .aio_nbytes = bytes, 3862 .copy_range = { 3863 .aio_fd2 = s->fd, 3864 .aio_offset2 = dst_offset, 3865 }, 3866 }; 3867 3868 return raw_thread_pool_submit(handle_aiocb_copy_range, &acb); 3869 } 3870 3871 BlockDriver bdrv_file = { 3872 .format_name = "file", 3873 .protocol_name = "file", 3874 .instance_size = sizeof(BDRVRawState), 3875 .bdrv_needs_filename = true, 3876 .bdrv_probe = NULL, /* no probe for protocols */ 3877 .bdrv_parse_filename = raw_parse_filename, 3878 .bdrv_file_open = raw_open, 3879 .bdrv_reopen_prepare = raw_reopen_prepare, 3880 .bdrv_reopen_commit = raw_reopen_commit, 3881 .bdrv_reopen_abort = raw_reopen_abort, 3882 .bdrv_close = raw_close, 3883 .bdrv_co_create = raw_co_create, 3884 .bdrv_co_create_opts = raw_co_create_opts, 3885 .bdrv_has_zero_init = bdrv_has_zero_init_1, 3886 .bdrv_co_block_status = raw_co_block_status, 3887 .bdrv_co_invalidate_cache = raw_co_invalidate_cache, 3888 .bdrv_co_pwrite_zeroes = raw_co_pwrite_zeroes, 3889 .bdrv_co_delete_file = raw_co_delete_file, 3890 3891 .bdrv_co_preadv = raw_co_preadv, 3892 .bdrv_co_pwritev = raw_co_pwritev, 3893 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 3894 .bdrv_co_pdiscard = raw_co_pdiscard, 3895 .bdrv_co_copy_range_from = raw_co_copy_range_from, 3896 .bdrv_co_copy_range_to = raw_co_copy_range_to, 3897 .bdrv_refresh_limits = raw_refresh_limits, 3898 .bdrv_attach_aio_context = raw_aio_attach_aio_context, 3899 3900 .bdrv_co_truncate = raw_co_truncate, 3901 .bdrv_co_getlength = raw_co_getlength, 3902 .bdrv_co_get_info = raw_co_get_info, 3903 .bdrv_get_specific_info = raw_get_specific_info, 3904 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 3905 .bdrv_get_specific_stats = raw_get_specific_stats, 3906 .bdrv_check_perm = raw_check_perm, 3907 .bdrv_set_perm = raw_set_perm, 3908 .bdrv_abort_perm_update = raw_abort_perm_update, 3909 .create_opts = &raw_create_opts, 3910 .mutable_opts = mutable_opts, 3911 }; 3912 3913 /***********************************************/ 3914 /* host device */ 3915 3916 #if defined(HAVE_HOST_BLOCK_DEVICE) 3917 3918 #if defined(__APPLE__) && defined(__MACH__) 3919 static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath, 3920 CFIndex maxPathSize, int flags); 3921 3922 #if !defined(MAC_OS_VERSION_12_0) \ 3923 || (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_VERSION_12_0) 3924 #define IOMainPort IOMasterPort 3925 #endif 3926 3927 static char *FindEjectableOpticalMedia(io_iterator_t *mediaIterator) 3928 { 3929 kern_return_t kernResult = KERN_FAILURE; 3930 mach_port_t mainPort; 3931 CFMutableDictionaryRef classesToMatch; 3932 const char *matching_array[] = {kIODVDMediaClass, kIOCDMediaClass}; 3933 char *mediaType = NULL; 3934 3935 kernResult = IOMainPort(MACH_PORT_NULL, &mainPort); 3936 if ( KERN_SUCCESS != kernResult ) { 3937 printf("IOMainPort returned %d\n", kernResult); 3938 } 3939 3940 int index; 3941 for (index = 0; index < ARRAY_SIZE(matching_array); index++) { 3942 classesToMatch = IOServiceMatching(matching_array[index]); 3943 if (classesToMatch == NULL) { 3944 error_report("IOServiceMatching returned NULL for %s", 3945 matching_array[index]); 3946 continue; 3947 } 3948 CFDictionarySetValue(classesToMatch, CFSTR(kIOMediaEjectableKey), 3949 kCFBooleanTrue); 3950 kernResult = IOServiceGetMatchingServices(mainPort, classesToMatch, 3951 mediaIterator); 3952 if (kernResult != KERN_SUCCESS) { 3953 error_report("Note: IOServiceGetMatchingServices returned %d", 3954 kernResult); 3955 continue; 3956 } 3957 3958 /* If a match was found, leave the loop */ 3959 if (*mediaIterator != 0) { 3960 trace_file_FindEjectableOpticalMedia(matching_array[index]); 3961 mediaType = g_strdup(matching_array[index]); 3962 break; 3963 } 3964 } 3965 return mediaType; 3966 } 3967 3968 kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath, 3969 CFIndex maxPathSize, int flags) 3970 { 3971 io_object_t nextMedia; 3972 kern_return_t kernResult = KERN_FAILURE; 3973 *bsdPath = '\0'; 3974 nextMedia = IOIteratorNext( mediaIterator ); 3975 if ( nextMedia ) 3976 { 3977 CFTypeRef bsdPathAsCFString; 3978 bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 ); 3979 if ( bsdPathAsCFString ) { 3980 size_t devPathLength; 3981 strcpy( bsdPath, _PATH_DEV ); 3982 if (flags & BDRV_O_NOCACHE) { 3983 strcat(bsdPath, "r"); 3984 } 3985 devPathLength = strlen( bsdPath ); 3986 if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) { 3987 kernResult = KERN_SUCCESS; 3988 } 3989 CFRelease( bsdPathAsCFString ); 3990 } 3991 IOObjectRelease( nextMedia ); 3992 } 3993 3994 return kernResult; 3995 } 3996 3997 /* Sets up a real cdrom for use in QEMU */ 3998 static bool setup_cdrom(char *bsd_path, Error **errp) 3999 { 4000 int index, num_of_test_partitions = 2, fd; 4001 char test_partition[MAXPATHLEN]; 4002 bool partition_found = false; 4003 4004 /* look for a working partition */ 4005 for (index = 0; index < num_of_test_partitions; index++) { 4006 snprintf(test_partition, sizeof(test_partition), "%ss%d", bsd_path, 4007 index); 4008 fd = qemu_open(test_partition, O_RDONLY | O_BINARY | O_LARGEFILE, NULL); 4009 if (fd >= 0) { 4010 partition_found = true; 4011 qemu_close(fd); 4012 break; 4013 } 4014 } 4015 4016 /* if a working partition on the device was not found */ 4017 if (partition_found == false) { 4018 error_setg(errp, "Failed to find a working partition on disc"); 4019 } else { 4020 trace_file_setup_cdrom(test_partition); 4021 pstrcpy(bsd_path, MAXPATHLEN, test_partition); 4022 } 4023 return partition_found; 4024 } 4025 4026 /* Prints directions on mounting and unmounting a device */ 4027 static void print_unmounting_directions(const char *file_name) 4028 { 4029 error_report("If device %s is mounted on the desktop, unmount" 4030 " it first before using it in QEMU", file_name); 4031 error_report("Command to unmount device: diskutil unmountDisk %s", 4032 file_name); 4033 error_report("Command to mount device: diskutil mountDisk %s", file_name); 4034 } 4035 4036 #endif /* defined(__APPLE__) && defined(__MACH__) */ 4037 4038 static int hdev_probe_device(const char *filename) 4039 { 4040 struct stat st; 4041 4042 /* allow a dedicated CD-ROM driver to match with a higher priority */ 4043 if (strstart(filename, "/dev/cdrom", NULL)) 4044 return 50; 4045 4046 if (stat(filename, &st) >= 0 && 4047 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { 4048 return 100; 4049 } 4050 4051 return 0; 4052 } 4053 4054 static void hdev_parse_filename(const char *filename, QDict *options, 4055 Error **errp) 4056 { 4057 bdrv_parse_filename_strip_prefix(filename, "host_device:", options); 4058 } 4059 4060 static bool hdev_is_sg(BlockDriverState *bs) 4061 { 4062 4063 #if defined(__linux__) 4064 4065 BDRVRawState *s = bs->opaque; 4066 struct stat st; 4067 struct sg_scsi_id scsiid; 4068 int sg_version; 4069 int ret; 4070 4071 if (stat(bs->filename, &st) < 0 || !S_ISCHR(st.st_mode)) { 4072 return false; 4073 } 4074 4075 ret = ioctl(s->fd, SG_GET_VERSION_NUM, &sg_version); 4076 if (ret < 0) { 4077 return false; 4078 } 4079 4080 ret = ioctl(s->fd, SG_GET_SCSI_ID, &scsiid); 4081 if (ret >= 0) { 4082 trace_file_hdev_is_sg(scsiid.scsi_type, sg_version); 4083 return true; 4084 } 4085 4086 #endif 4087 4088 return false; 4089 } 4090 4091 static int hdev_open(BlockDriverState *bs, QDict *options, int flags, 4092 Error **errp) 4093 { 4094 BDRVRawState *s = bs->opaque; 4095 int ret; 4096 4097 #if defined(__APPLE__) && defined(__MACH__) 4098 /* 4099 * Caution: while qdict_get_str() is fine, getting non-string types 4100 * would require more care. When @options come from -blockdev or 4101 * blockdev_add, its members are typed according to the QAPI 4102 * schema, but when they come from -drive, they're all QString. 4103 */ 4104 const char *filename = qdict_get_str(options, "filename"); 4105 char bsd_path[MAXPATHLEN] = ""; 4106 bool error_occurred = false; 4107 4108 /* If using a real cdrom */ 4109 if (strcmp(filename, "/dev/cdrom") == 0) { 4110 char *mediaType = NULL; 4111 kern_return_t ret_val; 4112 io_iterator_t mediaIterator = 0; 4113 4114 mediaType = FindEjectableOpticalMedia(&mediaIterator); 4115 if (mediaType == NULL) { 4116 error_setg(errp, "Please make sure your CD/DVD is in the optical" 4117 " drive"); 4118 error_occurred = true; 4119 goto hdev_open_Mac_error; 4120 } 4121 4122 ret_val = GetBSDPath(mediaIterator, bsd_path, sizeof(bsd_path), flags); 4123 if (ret_val != KERN_SUCCESS) { 4124 error_setg(errp, "Could not get BSD path for optical drive"); 4125 error_occurred = true; 4126 goto hdev_open_Mac_error; 4127 } 4128 4129 /* If a real optical drive was not found */ 4130 if (bsd_path[0] == '\0') { 4131 error_setg(errp, "Failed to obtain bsd path for optical drive"); 4132 error_occurred = true; 4133 goto hdev_open_Mac_error; 4134 } 4135 4136 /* If using a cdrom disc and finding a partition on the disc failed */ 4137 if (strncmp(mediaType, kIOCDMediaClass, 9) == 0 && 4138 setup_cdrom(bsd_path, errp) == false) { 4139 print_unmounting_directions(bsd_path); 4140 error_occurred = true; 4141 goto hdev_open_Mac_error; 4142 } 4143 4144 qdict_put_str(options, "filename", bsd_path); 4145 4146 hdev_open_Mac_error: 4147 g_free(mediaType); 4148 if (mediaIterator) { 4149 IOObjectRelease(mediaIterator); 4150 } 4151 if (error_occurred) { 4152 return -ENOENT; 4153 } 4154 } 4155 #endif /* defined(__APPLE__) && defined(__MACH__) */ 4156 4157 s->type = FTYPE_FILE; 4158 4159 ret = raw_open_common(bs, options, flags, 0, true, errp); 4160 if (ret < 0) { 4161 #if defined(__APPLE__) && defined(__MACH__) 4162 if (*bsd_path) { 4163 filename = bsd_path; 4164 } 4165 /* if a physical device experienced an error while being opened */ 4166 if (strncmp(filename, "/dev/", 5) == 0) { 4167 print_unmounting_directions(filename); 4168 } 4169 #endif /* defined(__APPLE__) && defined(__MACH__) */ 4170 return ret; 4171 } 4172 4173 /* Since this does ioctl the device must be already opened */ 4174 bs->sg = hdev_is_sg(bs); 4175 4176 return ret; 4177 } 4178 4179 #if defined(__linux__) 4180 static int coroutine_fn 4181 hdev_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 4182 { 4183 BDRVRawState *s = bs->opaque; 4184 RawPosixAIOData acb; 4185 int ret; 4186 4187 ret = fd_open(bs); 4188 if (ret < 0) { 4189 return ret; 4190 } 4191 4192 if (req == SG_IO && s->pr_mgr) { 4193 struct sg_io_hdr *io_hdr = buf; 4194 if (io_hdr->cmdp[0] == PERSISTENT_RESERVE_OUT || 4195 io_hdr->cmdp[0] == PERSISTENT_RESERVE_IN) { 4196 return pr_manager_execute(s->pr_mgr, qemu_get_current_aio_context(), 4197 s->fd, io_hdr); 4198 } 4199 } 4200 4201 acb = (RawPosixAIOData) { 4202 .bs = bs, 4203 .aio_type = QEMU_AIO_IOCTL, 4204 .aio_fildes = s->fd, 4205 .aio_offset = 0, 4206 .ioctl = { 4207 .buf = buf, 4208 .cmd = req, 4209 }, 4210 }; 4211 4212 return raw_thread_pool_submit(handle_aiocb_ioctl, &acb); 4213 } 4214 #endif /* linux */ 4215 4216 static coroutine_fn int 4217 hdev_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) 4218 { 4219 BDRVRawState *s = bs->opaque; 4220 int ret; 4221 4222 ret = fd_open(bs); 4223 if (ret < 0) { 4224 raw_account_discard(s, bytes, ret); 4225 return ret; 4226 } 4227 return raw_do_pdiscard(bs, offset, bytes, true); 4228 } 4229 4230 static coroutine_fn int hdev_co_pwrite_zeroes(BlockDriverState *bs, 4231 int64_t offset, int64_t bytes, BdrvRequestFlags flags) 4232 { 4233 int rc; 4234 4235 rc = fd_open(bs); 4236 if (rc < 0) { 4237 return rc; 4238 } 4239 4240 return raw_do_pwrite_zeroes(bs, offset, bytes, flags, true); 4241 } 4242 4243 static BlockDriver bdrv_host_device = { 4244 .format_name = "host_device", 4245 .protocol_name = "host_device", 4246 .instance_size = sizeof(BDRVRawState), 4247 .bdrv_needs_filename = true, 4248 .bdrv_probe_device = hdev_probe_device, 4249 .bdrv_parse_filename = hdev_parse_filename, 4250 .bdrv_file_open = hdev_open, 4251 .bdrv_close = raw_close, 4252 .bdrv_reopen_prepare = raw_reopen_prepare, 4253 .bdrv_reopen_commit = raw_reopen_commit, 4254 .bdrv_reopen_abort = raw_reopen_abort, 4255 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 4256 .create_opts = &bdrv_create_opts_simple, 4257 .mutable_opts = mutable_opts, 4258 .bdrv_co_invalidate_cache = raw_co_invalidate_cache, 4259 .bdrv_co_pwrite_zeroes = hdev_co_pwrite_zeroes, 4260 4261 .bdrv_co_preadv = raw_co_preadv, 4262 .bdrv_co_pwritev = raw_co_pwritev, 4263 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 4264 .bdrv_co_pdiscard = hdev_co_pdiscard, 4265 .bdrv_co_copy_range_from = raw_co_copy_range_from, 4266 .bdrv_co_copy_range_to = raw_co_copy_range_to, 4267 .bdrv_refresh_limits = raw_refresh_limits, 4268 .bdrv_attach_aio_context = raw_aio_attach_aio_context, 4269 4270 .bdrv_co_truncate = raw_co_truncate, 4271 .bdrv_co_getlength = raw_co_getlength, 4272 .bdrv_co_get_info = raw_co_get_info, 4273 .bdrv_get_specific_info = raw_get_specific_info, 4274 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 4275 .bdrv_get_specific_stats = hdev_get_specific_stats, 4276 .bdrv_check_perm = raw_check_perm, 4277 .bdrv_set_perm = raw_set_perm, 4278 .bdrv_abort_perm_update = raw_abort_perm_update, 4279 .bdrv_probe_blocksizes = hdev_probe_blocksizes, 4280 .bdrv_probe_geometry = hdev_probe_geometry, 4281 4282 /* generic scsi device */ 4283 #ifdef __linux__ 4284 .bdrv_co_ioctl = hdev_co_ioctl, 4285 #endif 4286 4287 /* zoned device */ 4288 #if defined(CONFIG_BLKZONED) 4289 /* zone management operations */ 4290 .bdrv_co_zone_report = raw_co_zone_report, 4291 .bdrv_co_zone_mgmt = raw_co_zone_mgmt, 4292 .bdrv_co_zone_append = raw_co_zone_append, 4293 #endif 4294 }; 4295 4296 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 4297 static void cdrom_parse_filename(const char *filename, QDict *options, 4298 Error **errp) 4299 { 4300 bdrv_parse_filename_strip_prefix(filename, "host_cdrom:", options); 4301 } 4302 4303 static void cdrom_refresh_limits(BlockDriverState *bs, Error **errp) 4304 { 4305 bs->bl.has_variable_length = true; 4306 raw_refresh_limits(bs, errp); 4307 } 4308 #endif 4309 4310 #ifdef __linux__ 4311 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags, 4312 Error **errp) 4313 { 4314 BDRVRawState *s = bs->opaque; 4315 4316 s->type = FTYPE_CD; 4317 4318 /* open will not fail even if no CD is inserted, so add O_NONBLOCK */ 4319 return raw_open_common(bs, options, flags, O_NONBLOCK, true, errp); 4320 } 4321 4322 static int cdrom_probe_device(const char *filename) 4323 { 4324 int fd, ret; 4325 int prio = 0; 4326 struct stat st; 4327 4328 fd = qemu_open(filename, O_RDONLY | O_NONBLOCK, NULL); 4329 if (fd < 0) { 4330 goto out; 4331 } 4332 ret = fstat(fd, &st); 4333 if (ret == -1 || !S_ISBLK(st.st_mode)) { 4334 goto outc; 4335 } 4336 4337 /* Attempt to detect via a CDROM specific ioctl */ 4338 ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT); 4339 if (ret >= 0) 4340 prio = 100; 4341 4342 outc: 4343 qemu_close(fd); 4344 out: 4345 return prio; 4346 } 4347 4348 static bool coroutine_fn cdrom_co_is_inserted(BlockDriverState *bs) 4349 { 4350 BDRVRawState *s = bs->opaque; 4351 int ret; 4352 4353 ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT); 4354 return ret == CDS_DISC_OK; 4355 } 4356 4357 static void coroutine_fn cdrom_co_eject(BlockDriverState *bs, bool eject_flag) 4358 { 4359 BDRVRawState *s = bs->opaque; 4360 4361 if (eject_flag) { 4362 if (ioctl(s->fd, CDROMEJECT, NULL) < 0) 4363 perror("CDROMEJECT"); 4364 } else { 4365 if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0) 4366 perror("CDROMEJECT"); 4367 } 4368 } 4369 4370 static void coroutine_fn cdrom_co_lock_medium(BlockDriverState *bs, bool locked) 4371 { 4372 BDRVRawState *s = bs->opaque; 4373 4374 if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) { 4375 /* 4376 * Note: an error can happen if the distribution automatically 4377 * mounts the CD-ROM 4378 */ 4379 /* perror("CDROM_LOCKDOOR"); */ 4380 } 4381 } 4382 4383 static BlockDriver bdrv_host_cdrom = { 4384 .format_name = "host_cdrom", 4385 .protocol_name = "host_cdrom", 4386 .instance_size = sizeof(BDRVRawState), 4387 .bdrv_needs_filename = true, 4388 .bdrv_probe_device = cdrom_probe_device, 4389 .bdrv_parse_filename = cdrom_parse_filename, 4390 .bdrv_file_open = cdrom_open, 4391 .bdrv_close = raw_close, 4392 .bdrv_reopen_prepare = raw_reopen_prepare, 4393 .bdrv_reopen_commit = raw_reopen_commit, 4394 .bdrv_reopen_abort = raw_reopen_abort, 4395 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 4396 .create_opts = &bdrv_create_opts_simple, 4397 .mutable_opts = mutable_opts, 4398 .bdrv_co_invalidate_cache = raw_co_invalidate_cache, 4399 4400 .bdrv_co_preadv = raw_co_preadv, 4401 .bdrv_co_pwritev = raw_co_pwritev, 4402 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 4403 .bdrv_refresh_limits = cdrom_refresh_limits, 4404 .bdrv_attach_aio_context = raw_aio_attach_aio_context, 4405 4406 .bdrv_co_truncate = raw_co_truncate, 4407 .bdrv_co_getlength = raw_co_getlength, 4408 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 4409 4410 /* removable device support */ 4411 .bdrv_co_is_inserted = cdrom_co_is_inserted, 4412 .bdrv_co_eject = cdrom_co_eject, 4413 .bdrv_co_lock_medium = cdrom_co_lock_medium, 4414 4415 /* generic scsi device */ 4416 .bdrv_co_ioctl = hdev_co_ioctl, 4417 }; 4418 #endif /* __linux__ */ 4419 4420 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) 4421 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags, 4422 Error **errp) 4423 { 4424 BDRVRawState *s = bs->opaque; 4425 int ret; 4426 4427 s->type = FTYPE_CD; 4428 4429 ret = raw_open_common(bs, options, flags, 0, true, errp); 4430 if (ret) { 4431 return ret; 4432 } 4433 4434 /* make sure the door isn't locked at this time */ 4435 ioctl(s->fd, CDIOCALLOW); 4436 return 0; 4437 } 4438 4439 static int cdrom_probe_device(const char *filename) 4440 { 4441 if (strstart(filename, "/dev/cd", NULL) || 4442 strstart(filename, "/dev/acd", NULL)) 4443 return 100; 4444 return 0; 4445 } 4446 4447 static int cdrom_reopen(BlockDriverState *bs) 4448 { 4449 BDRVRawState *s = bs->opaque; 4450 int fd; 4451 4452 /* 4453 * Force reread of possibly changed/newly loaded disc, 4454 * FreeBSD seems to not notice sometimes... 4455 */ 4456 if (s->fd >= 0) 4457 qemu_close(s->fd); 4458 fd = qemu_open(bs->filename, s->open_flags, NULL); 4459 if (fd < 0) { 4460 s->fd = -1; 4461 return -EIO; 4462 } 4463 s->fd = fd; 4464 4465 /* make sure the door isn't locked at this time */ 4466 ioctl(s->fd, CDIOCALLOW); 4467 return 0; 4468 } 4469 4470 static bool coroutine_fn cdrom_co_is_inserted(BlockDriverState *bs) 4471 { 4472 return raw_getlength(bs) > 0; 4473 } 4474 4475 static void coroutine_fn cdrom_co_eject(BlockDriverState *bs, bool eject_flag) 4476 { 4477 BDRVRawState *s = bs->opaque; 4478 4479 if (s->fd < 0) 4480 return; 4481 4482 (void) ioctl(s->fd, CDIOCALLOW); 4483 4484 if (eject_flag) { 4485 if (ioctl(s->fd, CDIOCEJECT) < 0) 4486 perror("CDIOCEJECT"); 4487 } else { 4488 if (ioctl(s->fd, CDIOCCLOSE) < 0) 4489 perror("CDIOCCLOSE"); 4490 } 4491 4492 cdrom_reopen(bs); 4493 } 4494 4495 static void coroutine_fn cdrom_co_lock_medium(BlockDriverState *bs, bool locked) 4496 { 4497 BDRVRawState *s = bs->opaque; 4498 4499 if (s->fd < 0) 4500 return; 4501 if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) { 4502 /* 4503 * Note: an error can happen if the distribution automatically 4504 * mounts the CD-ROM 4505 */ 4506 /* perror("CDROM_LOCKDOOR"); */ 4507 } 4508 } 4509 4510 static BlockDriver bdrv_host_cdrom = { 4511 .format_name = "host_cdrom", 4512 .protocol_name = "host_cdrom", 4513 .instance_size = sizeof(BDRVRawState), 4514 .bdrv_needs_filename = true, 4515 .bdrv_probe_device = cdrom_probe_device, 4516 .bdrv_parse_filename = cdrom_parse_filename, 4517 .bdrv_file_open = cdrom_open, 4518 .bdrv_close = raw_close, 4519 .bdrv_reopen_prepare = raw_reopen_prepare, 4520 .bdrv_reopen_commit = raw_reopen_commit, 4521 .bdrv_reopen_abort = raw_reopen_abort, 4522 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 4523 .create_opts = &bdrv_create_opts_simple, 4524 .mutable_opts = mutable_opts, 4525 4526 .bdrv_co_preadv = raw_co_preadv, 4527 .bdrv_co_pwritev = raw_co_pwritev, 4528 .bdrv_co_flush_to_disk = raw_co_flush_to_disk, 4529 .bdrv_refresh_limits = cdrom_refresh_limits, 4530 .bdrv_attach_aio_context = raw_aio_attach_aio_context, 4531 4532 .bdrv_co_truncate = raw_co_truncate, 4533 .bdrv_co_getlength = raw_co_getlength, 4534 .bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size, 4535 4536 /* removable device support */ 4537 .bdrv_co_is_inserted = cdrom_co_is_inserted, 4538 .bdrv_co_eject = cdrom_co_eject, 4539 .bdrv_co_lock_medium = cdrom_co_lock_medium, 4540 }; 4541 #endif /* __FreeBSD__ */ 4542 4543 #endif /* HAVE_HOST_BLOCK_DEVICE */ 4544 4545 static void bdrv_file_init(void) 4546 { 4547 /* 4548 * Register all the drivers. Note that order is important, the driver 4549 * registered last will get probed first. 4550 */ 4551 bdrv_register(&bdrv_file); 4552 #if defined(HAVE_HOST_BLOCK_DEVICE) 4553 bdrv_register(&bdrv_host_device); 4554 #ifdef __linux__ 4555 bdrv_register(&bdrv_host_cdrom); 4556 #endif 4557 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 4558 bdrv_register(&bdrv_host_cdrom); 4559 #endif 4560 #endif /* HAVE_HOST_BLOCK_DEVICE */ 4561 } 4562 4563 block_init(bdrv_file_init); 4564