1 /* 2 * 9p Posix callback 3 * 4 * Copyright IBM, Corp. 2010 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "qemu/osdep.h" 15 #include "9p.h" 16 #include "9p-local.h" 17 #include "9p-xattr.h" 18 #include "9p-util.h" 19 #include "fsdev/qemu-fsdev.h" /* local_ops */ 20 #include <arpa/inet.h> 21 #include <pwd.h> 22 #include <grp.h> 23 #include <sys/socket.h> 24 #include <sys/un.h> 25 #include "qemu/xattr.h" 26 #include "qemu/cutils.h" 27 #include "qemu/error-report.h" 28 #include <libgen.h> 29 #include <linux/fs.h> 30 #ifdef CONFIG_LINUX_MAGIC_H 31 #include <linux/magic.h> 32 #endif 33 #include <sys/ioctl.h> 34 35 #ifndef XFS_SUPER_MAGIC 36 #define XFS_SUPER_MAGIC 0x58465342 37 #endif 38 #ifndef EXT2_SUPER_MAGIC 39 #define EXT2_SUPER_MAGIC 0xEF53 40 #endif 41 #ifndef REISERFS_SUPER_MAGIC 42 #define REISERFS_SUPER_MAGIC 0x52654973 43 #endif 44 #ifndef BTRFS_SUPER_MAGIC 45 #define BTRFS_SUPER_MAGIC 0x9123683E 46 #endif 47 48 typedef struct { 49 int mountfd; 50 } LocalData; 51 52 int local_open_nofollow(FsContext *fs_ctx, const char *path, int flags, 53 mode_t mode) 54 { 55 LocalData *data = fs_ctx->private; 56 int fd = data->mountfd; 57 58 while (*path && fd != -1) { 59 const char *c; 60 int next_fd; 61 char *head; 62 63 /* Only relative paths without consecutive slashes */ 64 assert(*path != '/'); 65 66 head = g_strdup(path); 67 c = strchrnul(path, '/'); 68 if (*c) { 69 /* Intermediate path element */ 70 head[c - path] = 0; 71 path = c + 1; 72 next_fd = openat_dir(fd, head); 73 } else { 74 /* Rightmost path element */ 75 next_fd = openat_file(fd, head, flags, mode); 76 path = c; 77 } 78 g_free(head); 79 if (fd != data->mountfd) { 80 close_preserve_errno(fd); 81 } 82 fd = next_fd; 83 } 84 85 assert(fd != data->mountfd); 86 return fd; 87 } 88 89 int local_opendir_nofollow(FsContext *fs_ctx, const char *path) 90 { 91 return local_open_nofollow(fs_ctx, path, O_DIRECTORY | O_RDONLY, 0); 92 } 93 94 static void renameat_preserve_errno(int odirfd, const char *opath, int ndirfd, 95 const char *npath) 96 { 97 int serrno = errno; 98 renameat(odirfd, opath, ndirfd, npath); 99 errno = serrno; 100 } 101 102 static void unlinkat_preserve_errno(int dirfd, const char *path, int flags) 103 { 104 int serrno = errno; 105 unlinkat(dirfd, path, flags); 106 errno = serrno; 107 } 108 109 #define VIRTFS_META_DIR ".virtfs_metadata" 110 #define VIRTFS_META_ROOT_FILE VIRTFS_META_DIR "_root" 111 112 static FILE *local_fopenat(int dirfd, const char *name, const char *mode) 113 { 114 int fd, o_mode = 0; 115 FILE *fp; 116 int flags; 117 /* 118 * only supports two modes 119 */ 120 if (mode[0] == 'r') { 121 flags = O_RDONLY; 122 } else if (mode[0] == 'w') { 123 flags = O_WRONLY | O_TRUNC | O_CREAT; 124 o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; 125 } else { 126 return NULL; 127 } 128 fd = openat_file(dirfd, name, flags, o_mode); 129 if (fd == -1) { 130 return NULL; 131 } 132 fp = fdopen(fd, mode); 133 if (!fp) { 134 close(fd); 135 } 136 return fp; 137 } 138 139 #define ATTR_MAX 100 140 static void local_mapped_file_attr(int dirfd, const char *name, 141 struct stat *stbuf) 142 { 143 FILE *fp; 144 char buf[ATTR_MAX]; 145 int map_dirfd; 146 147 if (strcmp(name, ".")) { 148 map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR); 149 if (map_dirfd == -1) { 150 return; 151 } 152 153 fp = local_fopenat(map_dirfd, name, "r"); 154 close_preserve_errno(map_dirfd); 155 } else { 156 fp = local_fopenat(dirfd, VIRTFS_META_ROOT_FILE, "r"); 157 } 158 if (!fp) { 159 return; 160 } 161 memset(buf, 0, ATTR_MAX); 162 while (fgets(buf, ATTR_MAX, fp)) { 163 if (!strncmp(buf, "virtfs.uid", 10)) { 164 stbuf->st_uid = atoi(buf+11); 165 } else if (!strncmp(buf, "virtfs.gid", 10)) { 166 stbuf->st_gid = atoi(buf+11); 167 } else if (!strncmp(buf, "virtfs.mode", 11)) { 168 stbuf->st_mode = atoi(buf+12); 169 } else if (!strncmp(buf, "virtfs.rdev", 11)) { 170 stbuf->st_rdev = atoi(buf+12); 171 } 172 memset(buf, 0, ATTR_MAX); 173 } 174 fclose(fp); 175 } 176 177 static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf) 178 { 179 int err = -1; 180 char *dirpath = g_path_get_dirname(fs_path->data); 181 char *name = g_path_get_basename(fs_path->data); 182 int dirfd; 183 184 dirfd = local_opendir_nofollow(fs_ctx, dirpath); 185 if (dirfd == -1) { 186 goto out; 187 } 188 189 err = fstatat(dirfd, name, stbuf, AT_SYMLINK_NOFOLLOW); 190 if (err) { 191 goto err_out; 192 } 193 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 194 /* Actual credentials are part of extended attrs */ 195 uid_t tmp_uid; 196 gid_t tmp_gid; 197 mode_t tmp_mode; 198 dev_t tmp_dev; 199 200 if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.uid", &tmp_uid, 201 sizeof(uid_t)) > 0) { 202 stbuf->st_uid = le32_to_cpu(tmp_uid); 203 } 204 if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.gid", &tmp_gid, 205 sizeof(gid_t)) > 0) { 206 stbuf->st_gid = le32_to_cpu(tmp_gid); 207 } 208 if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.mode", &tmp_mode, 209 sizeof(mode_t)) > 0) { 210 stbuf->st_mode = le32_to_cpu(tmp_mode); 211 } 212 if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.rdev", &tmp_dev, 213 sizeof(dev_t)) > 0) { 214 stbuf->st_rdev = le64_to_cpu(tmp_dev); 215 } 216 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 217 local_mapped_file_attr(dirfd, name, stbuf); 218 } 219 220 err_out: 221 close_preserve_errno(dirfd); 222 out: 223 g_free(name); 224 g_free(dirpath); 225 return err; 226 } 227 228 static int local_set_mapped_file_attrat(int dirfd, const char *name, 229 FsCred *credp) 230 { 231 FILE *fp; 232 int ret; 233 char buf[ATTR_MAX]; 234 int uid = -1, gid = -1, mode = -1, rdev = -1; 235 int map_dirfd = -1, map_fd; 236 bool is_root = !strcmp(name, "."); 237 238 if (is_root) { 239 fp = local_fopenat(dirfd, VIRTFS_META_ROOT_FILE, "r"); 240 if (!fp) { 241 if (errno == ENOENT) { 242 goto update_map_file; 243 } else { 244 return -1; 245 } 246 } 247 } else { 248 ret = mkdirat(dirfd, VIRTFS_META_DIR, 0700); 249 if (ret < 0 && errno != EEXIST) { 250 return -1; 251 } 252 253 map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR); 254 if (map_dirfd == -1) { 255 return -1; 256 } 257 258 fp = local_fopenat(map_dirfd, name, "r"); 259 if (!fp) { 260 if (errno == ENOENT) { 261 goto update_map_file; 262 } else { 263 close_preserve_errno(map_dirfd); 264 return -1; 265 } 266 } 267 } 268 memset(buf, 0, ATTR_MAX); 269 while (fgets(buf, ATTR_MAX, fp)) { 270 if (!strncmp(buf, "virtfs.uid", 10)) { 271 uid = atoi(buf + 11); 272 } else if (!strncmp(buf, "virtfs.gid", 10)) { 273 gid = atoi(buf + 11); 274 } else if (!strncmp(buf, "virtfs.mode", 11)) { 275 mode = atoi(buf + 12); 276 } else if (!strncmp(buf, "virtfs.rdev", 11)) { 277 rdev = atoi(buf + 12); 278 } 279 memset(buf, 0, ATTR_MAX); 280 } 281 fclose(fp); 282 283 update_map_file: 284 if (is_root) { 285 fp = local_fopenat(dirfd, VIRTFS_META_ROOT_FILE, "w"); 286 } else { 287 fp = local_fopenat(map_dirfd, name, "w"); 288 /* We can't go this far with map_dirfd not being a valid file descriptor 289 * but some versions of gcc aren't smart enough to see it. 290 */ 291 if (map_dirfd != -1) { 292 close_preserve_errno(map_dirfd); 293 } 294 } 295 if (!fp) { 296 return -1; 297 } 298 299 map_fd = fileno(fp); 300 assert(map_fd != -1); 301 ret = fchmod(map_fd, 0600); 302 assert(ret == 0); 303 304 if (credp->fc_uid != -1) { 305 uid = credp->fc_uid; 306 } 307 if (credp->fc_gid != -1) { 308 gid = credp->fc_gid; 309 } 310 if (credp->fc_mode != -1) { 311 mode = credp->fc_mode; 312 } 313 if (credp->fc_rdev != -1) { 314 rdev = credp->fc_rdev; 315 } 316 317 if (uid != -1) { 318 fprintf(fp, "virtfs.uid=%d\n", uid); 319 } 320 if (gid != -1) { 321 fprintf(fp, "virtfs.gid=%d\n", gid); 322 } 323 if (mode != -1) { 324 fprintf(fp, "virtfs.mode=%d\n", mode); 325 } 326 if (rdev != -1) { 327 fprintf(fp, "virtfs.rdev=%d\n", rdev); 328 } 329 fclose(fp); 330 331 return 0; 332 } 333 334 static int fchmodat_nofollow(int dirfd, const char *name, mode_t mode) 335 { 336 int fd, ret; 337 338 /* FIXME: this should be handled with fchmodat(AT_SYMLINK_NOFOLLOW). 339 * Unfortunately, the linux kernel doesn't implement it yet. As an 340 * alternative, let's open the file and use fchmod() instead. This 341 * may fail depending on the permissions of the file, but it is the 342 * best we can do to avoid TOCTTOU. We first try to open read-only 343 * in case name points to a directory. If that fails, we try write-only 344 * in case name doesn't point to a directory. 345 */ 346 fd = openat_file(dirfd, name, O_RDONLY, 0); 347 if (fd == -1) { 348 /* In case the file is writable-only and isn't a directory. */ 349 if (errno == EACCES) { 350 fd = openat_file(dirfd, name, O_WRONLY, 0); 351 } 352 if (fd == -1 && errno == EISDIR) { 353 errno = EACCES; 354 } 355 } 356 if (fd == -1) { 357 return -1; 358 } 359 ret = fchmod(fd, mode); 360 close_preserve_errno(fd); 361 return ret; 362 } 363 364 static int local_set_xattrat(int dirfd, const char *path, FsCred *credp) 365 { 366 int err; 367 368 if (credp->fc_uid != -1) { 369 uint32_t tmp_uid = cpu_to_le32(credp->fc_uid); 370 err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.uid", &tmp_uid, 371 sizeof(uid_t), 0); 372 if (err) { 373 return err; 374 } 375 } 376 if (credp->fc_gid != -1) { 377 uint32_t tmp_gid = cpu_to_le32(credp->fc_gid); 378 err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.gid", &tmp_gid, 379 sizeof(gid_t), 0); 380 if (err) { 381 return err; 382 } 383 } 384 if (credp->fc_mode != -1) { 385 uint32_t tmp_mode = cpu_to_le32(credp->fc_mode); 386 err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.mode", &tmp_mode, 387 sizeof(mode_t), 0); 388 if (err) { 389 return err; 390 } 391 } 392 if (credp->fc_rdev != -1) { 393 uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev); 394 err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.rdev", &tmp_rdev, 395 sizeof(dev_t), 0); 396 if (err) { 397 return err; 398 } 399 } 400 return 0; 401 } 402 403 static int local_set_cred_passthrough(FsContext *fs_ctx, int dirfd, 404 const char *name, FsCred *credp) 405 { 406 if (fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, 407 AT_SYMLINK_NOFOLLOW) < 0) { 408 /* 409 * If we fail to change ownership and if we are 410 * using security model none. Ignore the error 411 */ 412 if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) { 413 return -1; 414 } 415 } 416 417 return fchmodat_nofollow(dirfd, name, credp->fc_mode & 07777); 418 } 419 420 static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path, 421 char *buf, size_t bufsz) 422 { 423 ssize_t tsize = -1; 424 425 if ((fs_ctx->export_flags & V9FS_SM_MAPPED) || 426 (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) { 427 int fd; 428 429 fd = local_open_nofollow(fs_ctx, fs_path->data, O_RDONLY, 0); 430 if (fd == -1) { 431 return -1; 432 } 433 do { 434 tsize = read(fd, (void *)buf, bufsz); 435 } while (tsize == -1 && errno == EINTR); 436 close_preserve_errno(fd); 437 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || 438 (fs_ctx->export_flags & V9FS_SM_NONE)) { 439 char *dirpath = g_path_get_dirname(fs_path->data); 440 char *name = g_path_get_basename(fs_path->data); 441 int dirfd; 442 443 dirfd = local_opendir_nofollow(fs_ctx, dirpath); 444 if (dirfd == -1) { 445 goto out; 446 } 447 448 tsize = readlinkat(dirfd, name, buf, bufsz); 449 close_preserve_errno(dirfd); 450 out: 451 g_free(name); 452 g_free(dirpath); 453 } 454 return tsize; 455 } 456 457 static int local_close(FsContext *ctx, V9fsFidOpenState *fs) 458 { 459 return close(fs->fd); 460 } 461 462 static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs) 463 { 464 return closedir(fs->dir.stream); 465 } 466 467 static int local_open(FsContext *ctx, V9fsPath *fs_path, 468 int flags, V9fsFidOpenState *fs) 469 { 470 int fd; 471 472 fd = local_open_nofollow(ctx, fs_path->data, flags, 0); 473 if (fd == -1) { 474 return -1; 475 } 476 fs->fd = fd; 477 return fs->fd; 478 } 479 480 static int local_opendir(FsContext *ctx, 481 V9fsPath *fs_path, V9fsFidOpenState *fs) 482 { 483 int dirfd; 484 DIR *stream; 485 486 dirfd = local_opendir_nofollow(ctx, fs_path->data); 487 if (dirfd == -1) { 488 return -1; 489 } 490 491 stream = fdopendir(dirfd); 492 if (!stream) { 493 close(dirfd); 494 return -1; 495 } 496 fs->dir.stream = stream; 497 return 0; 498 } 499 500 static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) 501 { 502 rewinddir(fs->dir.stream); 503 } 504 505 static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs) 506 { 507 return telldir(fs->dir.stream); 508 } 509 510 static bool local_is_mapped_file_metadata(FsContext *fs_ctx, const char *name) 511 { 512 return 513 !strcmp(name, VIRTFS_META_DIR) || !strcmp(name, VIRTFS_META_ROOT_FILE); 514 } 515 516 static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs) 517 { 518 struct dirent *entry; 519 520 again: 521 entry = readdir(fs->dir.stream); 522 if (!entry) { 523 return NULL; 524 } 525 526 if (ctx->export_flags & V9FS_SM_MAPPED) { 527 entry->d_type = DT_UNKNOWN; 528 } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { 529 if (local_is_mapped_file_metadata(ctx, entry->d_name)) { 530 /* skip the meta data */ 531 goto again; 532 } 533 entry->d_type = DT_UNKNOWN; 534 } 535 536 return entry; 537 } 538 539 static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) 540 { 541 seekdir(fs->dir.stream, off); 542 } 543 544 static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs, 545 const struct iovec *iov, 546 int iovcnt, off_t offset) 547 { 548 #ifdef CONFIG_PREADV 549 return preadv(fs->fd, iov, iovcnt, offset); 550 #else 551 int err = lseek(fs->fd, offset, SEEK_SET); 552 if (err == -1) { 553 return err; 554 } else { 555 return readv(fs->fd, iov, iovcnt); 556 } 557 #endif 558 } 559 560 static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs, 561 const struct iovec *iov, 562 int iovcnt, off_t offset) 563 { 564 ssize_t ret; 565 #ifdef CONFIG_PREADV 566 ret = pwritev(fs->fd, iov, iovcnt, offset); 567 #else 568 int err = lseek(fs->fd, offset, SEEK_SET); 569 if (err == -1) { 570 return err; 571 } else { 572 ret = writev(fs->fd, iov, iovcnt); 573 } 574 #endif 575 #ifdef CONFIG_SYNC_FILE_RANGE 576 if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) { 577 /* 578 * Initiate a writeback. This is not a data integrity sync. 579 * We want to ensure that we don't leave dirty pages in the cache 580 * after write when writeout=immediate is sepcified. 581 */ 582 sync_file_range(fs->fd, offset, ret, 583 SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE); 584 } 585 #endif 586 return ret; 587 } 588 589 static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) 590 { 591 char *dirpath = g_path_get_dirname(fs_path->data); 592 char *name = g_path_get_basename(fs_path->data); 593 int ret = -1; 594 int dirfd; 595 596 dirfd = local_opendir_nofollow(fs_ctx, dirpath); 597 if (dirfd == -1) { 598 goto out; 599 } 600 601 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 602 ret = local_set_xattrat(dirfd, name, credp); 603 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 604 ret = local_set_mapped_file_attrat(dirfd, name, credp); 605 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || 606 fs_ctx->export_flags & V9FS_SM_NONE) { 607 ret = fchmodat_nofollow(dirfd, name, credp->fc_mode); 608 } 609 close_preserve_errno(dirfd); 610 611 out: 612 g_free(dirpath); 613 g_free(name); 614 return ret; 615 } 616 617 static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path, 618 const char *name, FsCred *credp) 619 { 620 int err = -1; 621 int dirfd; 622 623 if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && 624 local_is_mapped_file_metadata(fs_ctx, name)) { 625 errno = EINVAL; 626 return -1; 627 } 628 629 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); 630 if (dirfd == -1) { 631 return -1; 632 } 633 634 if (fs_ctx->export_flags & V9FS_SM_MAPPED || 635 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 636 err = mknodat(dirfd, name, fs_ctx->fmode | S_IFREG, 0); 637 if (err == -1) { 638 goto out; 639 } 640 641 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 642 err = local_set_xattrat(dirfd, name, credp); 643 } else { 644 err = local_set_mapped_file_attrat(dirfd, name, credp); 645 } 646 if (err == -1) { 647 goto err_end; 648 } 649 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || 650 fs_ctx->export_flags & V9FS_SM_NONE) { 651 err = mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev); 652 if (err == -1) { 653 goto out; 654 } 655 err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); 656 if (err == -1) { 657 goto err_end; 658 } 659 } 660 goto out; 661 662 err_end: 663 unlinkat_preserve_errno(dirfd, name, 0); 664 out: 665 close_preserve_errno(dirfd); 666 return err; 667 } 668 669 static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path, 670 const char *name, FsCred *credp) 671 { 672 int err = -1; 673 int dirfd; 674 675 if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && 676 local_is_mapped_file_metadata(fs_ctx, name)) { 677 errno = EINVAL; 678 return -1; 679 } 680 681 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); 682 if (dirfd == -1) { 683 return -1; 684 } 685 686 if (fs_ctx->export_flags & V9FS_SM_MAPPED || 687 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 688 err = mkdirat(dirfd, name, fs_ctx->dmode); 689 if (err == -1) { 690 goto out; 691 } 692 credp->fc_mode = credp->fc_mode | S_IFDIR; 693 694 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 695 err = local_set_xattrat(dirfd, name, credp); 696 } else { 697 err = local_set_mapped_file_attrat(dirfd, name, credp); 698 } 699 if (err == -1) { 700 goto err_end; 701 } 702 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || 703 fs_ctx->export_flags & V9FS_SM_NONE) { 704 err = mkdirat(dirfd, name, credp->fc_mode); 705 if (err == -1) { 706 goto out; 707 } 708 err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); 709 if (err == -1) { 710 goto err_end; 711 } 712 } 713 goto out; 714 715 err_end: 716 unlinkat_preserve_errno(dirfd, name, AT_REMOVEDIR); 717 out: 718 close_preserve_errno(dirfd); 719 return err; 720 } 721 722 static int local_fstat(FsContext *fs_ctx, int fid_type, 723 V9fsFidOpenState *fs, struct stat *stbuf) 724 { 725 int err, fd; 726 727 if (fid_type == P9_FID_DIR) { 728 fd = dirfd(fs->dir.stream); 729 } else { 730 fd = fs->fd; 731 } 732 733 err = fstat(fd, stbuf); 734 if (err) { 735 return err; 736 } 737 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 738 /* Actual credentials are part of extended attrs */ 739 uid_t tmp_uid; 740 gid_t tmp_gid; 741 mode_t tmp_mode; 742 dev_t tmp_dev; 743 744 if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) { 745 stbuf->st_uid = le32_to_cpu(tmp_uid); 746 } 747 if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) { 748 stbuf->st_gid = le32_to_cpu(tmp_gid); 749 } 750 if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) { 751 stbuf->st_mode = le32_to_cpu(tmp_mode); 752 } 753 if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) { 754 stbuf->st_rdev = le64_to_cpu(tmp_dev); 755 } 756 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 757 errno = EOPNOTSUPP; 758 return -1; 759 } 760 return err; 761 } 762 763 static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name, 764 int flags, FsCred *credp, V9fsFidOpenState *fs) 765 { 766 int fd = -1; 767 int err = -1; 768 int dirfd; 769 770 if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && 771 local_is_mapped_file_metadata(fs_ctx, name)) { 772 errno = EINVAL; 773 return -1; 774 } 775 776 /* 777 * Mark all the open to not follow symlinks 778 */ 779 flags |= O_NOFOLLOW; 780 781 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); 782 if (dirfd == -1) { 783 return -1; 784 } 785 786 /* Determine the security model */ 787 if (fs_ctx->export_flags & V9FS_SM_MAPPED || 788 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 789 fd = openat_file(dirfd, name, flags, fs_ctx->fmode); 790 if (fd == -1) { 791 goto out; 792 } 793 credp->fc_mode = credp->fc_mode|S_IFREG; 794 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 795 /* Set cleint credentials in xattr */ 796 err = local_set_xattrat(dirfd, name, credp); 797 } else { 798 err = local_set_mapped_file_attrat(dirfd, name, credp); 799 } 800 if (err == -1) { 801 goto err_end; 802 } 803 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || 804 (fs_ctx->export_flags & V9FS_SM_NONE)) { 805 fd = openat_file(dirfd, name, flags, credp->fc_mode); 806 if (fd == -1) { 807 goto out; 808 } 809 err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); 810 if (err == -1) { 811 goto err_end; 812 } 813 } 814 err = fd; 815 fs->fd = fd; 816 goto out; 817 818 err_end: 819 unlinkat_preserve_errno(dirfd, name, 820 flags & O_DIRECTORY ? AT_REMOVEDIR : 0); 821 close_preserve_errno(fd); 822 out: 823 close_preserve_errno(dirfd); 824 return err; 825 } 826 827 828 static int local_symlink(FsContext *fs_ctx, const char *oldpath, 829 V9fsPath *dir_path, const char *name, FsCred *credp) 830 { 831 int err = -1; 832 int dirfd; 833 834 if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && 835 local_is_mapped_file_metadata(fs_ctx, name)) { 836 errno = EINVAL; 837 return -1; 838 } 839 840 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); 841 if (dirfd == -1) { 842 return -1; 843 } 844 845 /* Determine the security model */ 846 if (fs_ctx->export_flags & V9FS_SM_MAPPED || 847 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 848 int fd; 849 ssize_t oldpath_size, write_size; 850 851 fd = openat_file(dirfd, name, O_CREAT | O_EXCL | O_RDWR, 852 fs_ctx->fmode); 853 if (fd == -1) { 854 goto out; 855 } 856 /* Write the oldpath (target) to the file. */ 857 oldpath_size = strlen(oldpath); 858 do { 859 write_size = write(fd, (void *)oldpath, oldpath_size); 860 } while (write_size == -1 && errno == EINTR); 861 close_preserve_errno(fd); 862 863 if (write_size != oldpath_size) { 864 goto err_end; 865 } 866 /* Set cleint credentials in symlink's xattr */ 867 credp->fc_mode = credp->fc_mode | S_IFLNK; 868 869 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 870 err = local_set_xattrat(dirfd, name, credp); 871 } else { 872 err = local_set_mapped_file_attrat(dirfd, name, credp); 873 } 874 if (err == -1) { 875 goto err_end; 876 } 877 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || 878 fs_ctx->export_flags & V9FS_SM_NONE) { 879 err = symlinkat(oldpath, dirfd, name); 880 if (err) { 881 goto out; 882 } 883 err = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, 884 AT_SYMLINK_NOFOLLOW); 885 if (err == -1) { 886 /* 887 * If we fail to change ownership and if we are 888 * using security model none. Ignore the error 889 */ 890 if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) { 891 goto err_end; 892 } else { 893 err = 0; 894 } 895 } 896 } 897 goto out; 898 899 err_end: 900 unlinkat_preserve_errno(dirfd, name, 0); 901 out: 902 close_preserve_errno(dirfd); 903 return err; 904 } 905 906 static int local_link(FsContext *ctx, V9fsPath *oldpath, 907 V9fsPath *dirpath, const char *name) 908 { 909 char *odirpath = g_path_get_dirname(oldpath->data); 910 char *oname = g_path_get_basename(oldpath->data); 911 int ret = -1; 912 int odirfd, ndirfd; 913 914 if (ctx->export_flags & V9FS_SM_MAPPED_FILE && 915 local_is_mapped_file_metadata(ctx, name)) { 916 errno = EINVAL; 917 return -1; 918 } 919 920 odirfd = local_opendir_nofollow(ctx, odirpath); 921 if (odirfd == -1) { 922 goto out; 923 } 924 925 ndirfd = local_opendir_nofollow(ctx, dirpath->data); 926 if (ndirfd == -1) { 927 close_preserve_errno(odirfd); 928 goto out; 929 } 930 931 ret = linkat(odirfd, oname, ndirfd, name, 0); 932 if (ret < 0) { 933 goto out_close; 934 } 935 936 /* now link the virtfs_metadata files */ 937 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { 938 int omap_dirfd, nmap_dirfd; 939 940 ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700); 941 if (ret < 0 && errno != EEXIST) { 942 goto err_undo_link; 943 } 944 945 omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR); 946 if (omap_dirfd == -1) { 947 goto err; 948 } 949 950 nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR); 951 if (nmap_dirfd == -1) { 952 close_preserve_errno(omap_dirfd); 953 goto err; 954 } 955 956 ret = linkat(omap_dirfd, oname, nmap_dirfd, name, 0); 957 close_preserve_errno(nmap_dirfd); 958 close_preserve_errno(omap_dirfd); 959 if (ret < 0 && errno != ENOENT) { 960 goto err_undo_link; 961 } 962 963 ret = 0; 964 } 965 goto out_close; 966 967 err: 968 ret = -1; 969 err_undo_link: 970 unlinkat_preserve_errno(ndirfd, name, 0); 971 out_close: 972 close_preserve_errno(ndirfd); 973 close_preserve_errno(odirfd); 974 out: 975 g_free(oname); 976 g_free(odirpath); 977 return ret; 978 } 979 980 static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size) 981 { 982 int fd, ret; 983 984 fd = local_open_nofollow(ctx, fs_path->data, O_WRONLY, 0); 985 if (fd == -1) { 986 return -1; 987 } 988 ret = ftruncate(fd, size); 989 close_preserve_errno(fd); 990 return ret; 991 } 992 993 static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) 994 { 995 char *dirpath = g_path_get_dirname(fs_path->data); 996 char *name = g_path_get_basename(fs_path->data); 997 int ret = -1; 998 int dirfd; 999 1000 dirfd = local_opendir_nofollow(fs_ctx, dirpath); 1001 if (dirfd == -1) { 1002 goto out; 1003 } 1004 1005 if ((credp->fc_uid == -1 && credp->fc_gid == -1) || 1006 (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || 1007 (fs_ctx->export_flags & V9FS_SM_NONE)) { 1008 ret = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, 1009 AT_SYMLINK_NOFOLLOW); 1010 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 1011 ret = local_set_xattrat(dirfd, name, credp); 1012 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 1013 ret = local_set_mapped_file_attrat(dirfd, name, credp); 1014 } 1015 1016 close_preserve_errno(dirfd); 1017 out: 1018 g_free(name); 1019 g_free(dirpath); 1020 return ret; 1021 } 1022 1023 static int local_utimensat(FsContext *s, V9fsPath *fs_path, 1024 const struct timespec *buf) 1025 { 1026 char *dirpath = g_path_get_dirname(fs_path->data); 1027 char *name = g_path_get_basename(fs_path->data); 1028 int dirfd, ret = -1; 1029 1030 dirfd = local_opendir_nofollow(s, dirpath); 1031 if (dirfd == -1) { 1032 goto out; 1033 } 1034 1035 ret = utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW); 1036 close_preserve_errno(dirfd); 1037 out: 1038 g_free(dirpath); 1039 g_free(name); 1040 return ret; 1041 } 1042 1043 static int local_unlinkat_common(FsContext *ctx, int dirfd, const char *name, 1044 int flags) 1045 { 1046 int ret = -1; 1047 1048 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { 1049 int map_dirfd; 1050 1051 /* We need to remove the metadata as well: 1052 * - the metadata directory if we're removing a directory 1053 * - the metadata file in the parent's metadata directory 1054 * 1055 * If any of these are missing (ie, ENOENT) then we're probably 1056 * trying to remove something that wasn't created in mapped-file 1057 * mode. We just ignore the error. 1058 */ 1059 if (flags == AT_REMOVEDIR) { 1060 int fd; 1061 1062 fd = openat_dir(dirfd, name); 1063 if (fd == -1) { 1064 goto err_out; 1065 } 1066 ret = unlinkat(fd, VIRTFS_META_DIR, AT_REMOVEDIR); 1067 close_preserve_errno(fd); 1068 if (ret < 0 && errno != ENOENT) { 1069 goto err_out; 1070 } 1071 } 1072 map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR); 1073 if (map_dirfd != -1) { 1074 ret = unlinkat(map_dirfd, name, 0); 1075 close_preserve_errno(map_dirfd); 1076 if (ret < 0 && errno != ENOENT) { 1077 goto err_out; 1078 } 1079 } else if (errno != ENOENT) { 1080 goto err_out; 1081 } 1082 } 1083 1084 ret = unlinkat(dirfd, name, flags); 1085 err_out: 1086 return ret; 1087 } 1088 1089 static int local_remove(FsContext *ctx, const char *path) 1090 { 1091 struct stat stbuf; 1092 char *dirpath = g_path_get_dirname(path); 1093 char *name = g_path_get_basename(path); 1094 int flags = 0; 1095 int dirfd; 1096 int err = -1; 1097 1098 dirfd = local_opendir_nofollow(ctx, dirpath); 1099 if (dirfd == -1) { 1100 goto out; 1101 } 1102 1103 if (fstatat(dirfd, name, &stbuf, AT_SYMLINK_NOFOLLOW) < 0) { 1104 goto err_out; 1105 } 1106 1107 if (S_ISDIR(stbuf.st_mode)) { 1108 flags |= AT_REMOVEDIR; 1109 } 1110 1111 err = local_unlinkat_common(ctx, dirfd, name, flags); 1112 err_out: 1113 close_preserve_errno(dirfd); 1114 out: 1115 g_free(name); 1116 g_free(dirpath); 1117 return err; 1118 } 1119 1120 static int local_fsync(FsContext *ctx, int fid_type, 1121 V9fsFidOpenState *fs, int datasync) 1122 { 1123 int fd; 1124 1125 if (fid_type == P9_FID_DIR) { 1126 fd = dirfd(fs->dir.stream); 1127 } else { 1128 fd = fs->fd; 1129 } 1130 1131 if (datasync) { 1132 return qemu_fdatasync(fd); 1133 } else { 1134 return fsync(fd); 1135 } 1136 } 1137 1138 static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf) 1139 { 1140 int fd, ret; 1141 1142 fd = local_open_nofollow(s, fs_path->data, O_RDONLY, 0); 1143 if (fd == -1) { 1144 return -1; 1145 } 1146 ret = fstatfs(fd, stbuf); 1147 close_preserve_errno(fd); 1148 return ret; 1149 } 1150 1151 static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path, 1152 const char *name, void *value, size_t size) 1153 { 1154 char *path = fs_path->data; 1155 1156 return v9fs_get_xattr(ctx, path, name, value, size); 1157 } 1158 1159 static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path, 1160 void *value, size_t size) 1161 { 1162 char *path = fs_path->data; 1163 1164 return v9fs_list_xattr(ctx, path, value, size); 1165 } 1166 1167 static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name, 1168 void *value, size_t size, int flags) 1169 { 1170 char *path = fs_path->data; 1171 1172 return v9fs_set_xattr(ctx, path, name, value, size, flags); 1173 } 1174 1175 static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path, 1176 const char *name) 1177 { 1178 char *path = fs_path->data; 1179 1180 return v9fs_remove_xattr(ctx, path, name); 1181 } 1182 1183 static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path, 1184 const char *name, V9fsPath *target) 1185 { 1186 if (ctx->export_flags & V9FS_SM_MAPPED_FILE && 1187 local_is_mapped_file_metadata(ctx, name)) { 1188 errno = EINVAL; 1189 return -1; 1190 } 1191 1192 if (dir_path) { 1193 if (!strcmp(name, ".")) { 1194 /* "." relative to "foo/bar" is "foo/bar" */ 1195 v9fs_path_copy(target, dir_path); 1196 } else if (!strcmp(name, "..")) { 1197 if (!strcmp(dir_path->data, ".")) { 1198 /* ".." relative to the root is "." */ 1199 v9fs_path_sprintf(target, "."); 1200 } else { 1201 char *tmp = g_path_get_dirname(dir_path->data); 1202 /* Symbolic links are resolved by the client. We can assume 1203 * that ".." relative to "foo/bar" is equivalent to "foo" 1204 */ 1205 v9fs_path_sprintf(target, "%s", tmp); 1206 g_free(tmp); 1207 } 1208 } else { 1209 assert(!strchr(name, '/')); 1210 v9fs_path_sprintf(target, "%s/%s", dir_path->data, name); 1211 } 1212 } else if (!strcmp(name, "/") || !strcmp(name, ".") || 1213 !strcmp(name, "..")) { 1214 /* This is the root fid */ 1215 v9fs_path_sprintf(target, "."); 1216 } else { 1217 assert(!strchr(name, '/')); 1218 v9fs_path_sprintf(target, "./%s", name); 1219 } 1220 return 0; 1221 } 1222 1223 static int local_renameat(FsContext *ctx, V9fsPath *olddir, 1224 const char *old_name, V9fsPath *newdir, 1225 const char *new_name) 1226 { 1227 int ret; 1228 int odirfd, ndirfd; 1229 1230 if (ctx->export_flags & V9FS_SM_MAPPED_FILE && 1231 (local_is_mapped_file_metadata(ctx, old_name) || 1232 local_is_mapped_file_metadata(ctx, new_name))) { 1233 errno = EINVAL; 1234 return -1; 1235 } 1236 1237 odirfd = local_opendir_nofollow(ctx, olddir->data); 1238 if (odirfd == -1) { 1239 return -1; 1240 } 1241 1242 ndirfd = local_opendir_nofollow(ctx, newdir->data); 1243 if (ndirfd == -1) { 1244 close_preserve_errno(odirfd); 1245 return -1; 1246 } 1247 1248 ret = renameat(odirfd, old_name, ndirfd, new_name); 1249 if (ret < 0) { 1250 goto out; 1251 } 1252 1253 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { 1254 int omap_dirfd, nmap_dirfd; 1255 1256 ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700); 1257 if (ret < 0 && errno != EEXIST) { 1258 goto err_undo_rename; 1259 } 1260 1261 omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR); 1262 if (omap_dirfd == -1) { 1263 goto err; 1264 } 1265 1266 nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR); 1267 if (nmap_dirfd == -1) { 1268 close_preserve_errno(omap_dirfd); 1269 goto err; 1270 } 1271 1272 /* rename the .virtfs_metadata files */ 1273 ret = renameat(omap_dirfd, old_name, nmap_dirfd, new_name); 1274 close_preserve_errno(nmap_dirfd); 1275 close_preserve_errno(omap_dirfd); 1276 if (ret < 0 && errno != ENOENT) { 1277 goto err_undo_rename; 1278 } 1279 1280 ret = 0; 1281 } 1282 goto out; 1283 1284 err: 1285 ret = -1; 1286 err_undo_rename: 1287 renameat_preserve_errno(ndirfd, new_name, odirfd, old_name); 1288 out: 1289 close_preserve_errno(ndirfd); 1290 close_preserve_errno(odirfd); 1291 return ret; 1292 } 1293 1294 static void v9fs_path_init_dirname(V9fsPath *path, const char *str) 1295 { 1296 path->data = g_path_get_dirname(str); 1297 path->size = strlen(path->data) + 1; 1298 } 1299 1300 static int local_rename(FsContext *ctx, const char *oldpath, 1301 const char *newpath) 1302 { 1303 int err; 1304 char *oname = g_path_get_basename(oldpath); 1305 char *nname = g_path_get_basename(newpath); 1306 V9fsPath olddir, newdir; 1307 1308 v9fs_path_init_dirname(&olddir, oldpath); 1309 v9fs_path_init_dirname(&newdir, newpath); 1310 1311 err = local_renameat(ctx, &olddir, oname, &newdir, nname); 1312 1313 v9fs_path_free(&newdir); 1314 v9fs_path_free(&olddir); 1315 g_free(nname); 1316 g_free(oname); 1317 1318 return err; 1319 } 1320 1321 static int local_unlinkat(FsContext *ctx, V9fsPath *dir, 1322 const char *name, int flags) 1323 { 1324 int ret; 1325 int dirfd; 1326 1327 if (ctx->export_flags & V9FS_SM_MAPPED_FILE && 1328 local_is_mapped_file_metadata(ctx, name)) { 1329 errno = EINVAL; 1330 return -1; 1331 } 1332 1333 dirfd = local_opendir_nofollow(ctx, dir->data); 1334 if (dirfd == -1) { 1335 return -1; 1336 } 1337 1338 ret = local_unlinkat_common(ctx, dirfd, name, flags); 1339 close_preserve_errno(dirfd); 1340 return ret; 1341 } 1342 1343 static int local_ioc_getversion(FsContext *ctx, V9fsPath *path, 1344 mode_t st_mode, uint64_t *st_gen) 1345 { 1346 #ifdef FS_IOC_GETVERSION 1347 int err; 1348 V9fsFidOpenState fid_open; 1349 1350 /* 1351 * Do not try to open special files like device nodes, fifos etc 1352 * We can get fd for regular files and directories only 1353 */ 1354 if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) { 1355 errno = ENOTTY; 1356 return -1; 1357 } 1358 err = local_open(ctx, path, O_RDONLY, &fid_open); 1359 if (err < 0) { 1360 return err; 1361 } 1362 err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen); 1363 local_close(ctx, &fid_open); 1364 return err; 1365 #else 1366 errno = ENOTTY; 1367 return -1; 1368 #endif 1369 } 1370 1371 static int local_init(FsContext *ctx) 1372 { 1373 struct statfs stbuf; 1374 LocalData *data = g_malloc(sizeof(*data)); 1375 1376 data->mountfd = open(ctx->fs_root, O_DIRECTORY | O_RDONLY); 1377 if (data->mountfd == -1) { 1378 goto err; 1379 } 1380 1381 #ifdef FS_IOC_GETVERSION 1382 /* 1383 * use ioc_getversion only if the ioctl is definied 1384 */ 1385 if (fstatfs(data->mountfd, &stbuf) < 0) { 1386 close_preserve_errno(data->mountfd); 1387 goto err; 1388 } 1389 switch (stbuf.f_type) { 1390 case EXT2_SUPER_MAGIC: 1391 case BTRFS_SUPER_MAGIC: 1392 case REISERFS_SUPER_MAGIC: 1393 case XFS_SUPER_MAGIC: 1394 ctx->exops.get_st_gen = local_ioc_getversion; 1395 break; 1396 } 1397 #endif 1398 1399 if (ctx->export_flags & V9FS_SM_PASSTHROUGH) { 1400 ctx->xops = passthrough_xattr_ops; 1401 } else if (ctx->export_flags & V9FS_SM_MAPPED) { 1402 ctx->xops = mapped_xattr_ops; 1403 } else if (ctx->export_flags & V9FS_SM_NONE) { 1404 ctx->xops = none_xattr_ops; 1405 } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { 1406 /* 1407 * xattr operation for mapped-file and passthrough 1408 * remain same. 1409 */ 1410 ctx->xops = passthrough_xattr_ops; 1411 } 1412 ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT; 1413 1414 ctx->private = data; 1415 return 0; 1416 1417 err: 1418 g_free(data); 1419 return -1; 1420 } 1421 1422 static void local_cleanup(FsContext *ctx) 1423 { 1424 LocalData *data = ctx->private; 1425 1426 close(data->mountfd); 1427 g_free(data); 1428 } 1429 1430 static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse) 1431 { 1432 const char *sec_model = qemu_opt_get(opts, "security_model"); 1433 const char *path = qemu_opt_get(opts, "path"); 1434 Error *err = NULL; 1435 1436 if (!sec_model) { 1437 error_report("Security model not specified, local fs needs security model"); 1438 error_printf("valid options are:" 1439 "\tsecurity_model=[passthrough|mapped-xattr|mapped-file|none]\n"); 1440 return -1; 1441 } 1442 1443 if (!strcmp(sec_model, "passthrough")) { 1444 fse->export_flags |= V9FS_SM_PASSTHROUGH; 1445 } else if (!strcmp(sec_model, "mapped") || 1446 !strcmp(sec_model, "mapped-xattr")) { 1447 fse->export_flags |= V9FS_SM_MAPPED; 1448 } else if (!strcmp(sec_model, "none")) { 1449 fse->export_flags |= V9FS_SM_NONE; 1450 } else if (!strcmp(sec_model, "mapped-file")) { 1451 fse->export_flags |= V9FS_SM_MAPPED_FILE; 1452 } else { 1453 error_report("Invalid security model %s specified", sec_model); 1454 error_printf("valid options are:" 1455 "\t[passthrough|mapped-xattr|mapped-file|none]\n"); 1456 return -1; 1457 } 1458 1459 if (!path) { 1460 error_report("fsdev: No path specified"); 1461 return -1; 1462 } 1463 1464 fsdev_throttle_parse_opts(opts, &fse->fst, &err); 1465 if (err) { 1466 error_reportf_err(err, "Throttle configuration is not valid: "); 1467 return -1; 1468 } 1469 1470 if (fse->export_flags & V9FS_SM_MAPPED || 1471 fse->export_flags & V9FS_SM_MAPPED_FILE) { 1472 fse->fmode = 1473 qemu_opt_get_number(opts, "fmode", SM_LOCAL_MODE_BITS) & 0777; 1474 fse->dmode = 1475 qemu_opt_get_number(opts, "dmode", SM_LOCAL_DIR_MODE_BITS) & 0777; 1476 } else { 1477 if (qemu_opt_find(opts, "fmode")) { 1478 error_report("fmode is only valid for mapped 9p modes"); 1479 return -1; 1480 } 1481 if (qemu_opt_find(opts, "dmode")) { 1482 error_report("dmode is only valid for mapped 9p modes"); 1483 return -1; 1484 } 1485 } 1486 1487 fse->path = g_strdup(path); 1488 1489 return 0; 1490 } 1491 1492 FileOperations local_ops = { 1493 .parse_opts = local_parse_opts, 1494 .init = local_init, 1495 .cleanup = local_cleanup, 1496 .lstat = local_lstat, 1497 .readlink = local_readlink, 1498 .close = local_close, 1499 .closedir = local_closedir, 1500 .open = local_open, 1501 .opendir = local_opendir, 1502 .rewinddir = local_rewinddir, 1503 .telldir = local_telldir, 1504 .readdir = local_readdir, 1505 .seekdir = local_seekdir, 1506 .preadv = local_preadv, 1507 .pwritev = local_pwritev, 1508 .chmod = local_chmod, 1509 .mknod = local_mknod, 1510 .mkdir = local_mkdir, 1511 .fstat = local_fstat, 1512 .open2 = local_open2, 1513 .symlink = local_symlink, 1514 .link = local_link, 1515 .truncate = local_truncate, 1516 .rename = local_rename, 1517 .chown = local_chown, 1518 .utimensat = local_utimensat, 1519 .remove = local_remove, 1520 .fsync = local_fsync, 1521 .statfs = local_statfs, 1522 .lgetxattr = local_lgetxattr, 1523 .llistxattr = local_llistxattr, 1524 .lsetxattr = local_lsetxattr, 1525 .lremovexattr = local_lremovexattr, 1526 .name_to_path = local_name_to_path, 1527 .renameat = local_renameat, 1528 .unlinkat = local_unlinkat, 1529 }; 1530