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 struct stat stbuf; 337 int fd, ret; 338 339 /* FIXME: this should be handled with fchmodat(AT_SYMLINK_NOFOLLOW). 340 * Unfortunately, the linux kernel doesn't implement it yet. 341 */ 342 343 /* First, we clear non-racing symlinks out of the way. */ 344 if (fstatat(dirfd, name, &stbuf, AT_SYMLINK_NOFOLLOW)) { 345 return -1; 346 } 347 if (S_ISLNK(stbuf.st_mode)) { 348 errno = ELOOP; 349 return -1; 350 } 351 352 fd = openat_file(dirfd, name, O_RDONLY | O_PATH_9P_UTIL | O_NOFOLLOW, 0); 353 #if O_PATH_9P_UTIL == 0 354 /* Fallback for systems that don't support O_PATH: we depend on the file 355 * being readable or writable. 356 */ 357 if (fd == -1) { 358 /* In case the file is writable-only and isn't a directory. */ 359 if (errno == EACCES) { 360 fd = openat_file(dirfd, name, O_WRONLY, 0); 361 } 362 if (fd == -1 && errno == EISDIR) { 363 errno = EACCES; 364 } 365 } 366 if (fd == -1) { 367 return -1; 368 } 369 ret = fchmod(fd, mode); 370 #else 371 /* Access modes are ignored when O_PATH is supported. If name is a symbolic 372 * link, O_PATH | O_NOFOLLOW causes openat(2) to return a file descriptor 373 * referring to the symbolic link. 374 */ 375 if (fd == -1) { 376 return -1; 377 } 378 379 /* Now we handle racing symlinks. */ 380 ret = fstat(fd, &stbuf); 381 if (!ret) { 382 if (S_ISLNK(stbuf.st_mode)) { 383 errno = ELOOP; 384 ret = -1; 385 } else { 386 char *proc_path = g_strdup_printf("/proc/self/fd/%d", fd); 387 ret = chmod(proc_path, mode); 388 g_free(proc_path); 389 } 390 } 391 #endif 392 close_preserve_errno(fd); 393 return ret; 394 } 395 396 static int local_set_xattrat(int dirfd, const char *path, FsCred *credp) 397 { 398 int err; 399 400 if (credp->fc_uid != -1) { 401 uint32_t tmp_uid = cpu_to_le32(credp->fc_uid); 402 err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.uid", &tmp_uid, 403 sizeof(uid_t), 0); 404 if (err) { 405 return err; 406 } 407 } 408 if (credp->fc_gid != -1) { 409 uint32_t tmp_gid = cpu_to_le32(credp->fc_gid); 410 err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.gid", &tmp_gid, 411 sizeof(gid_t), 0); 412 if (err) { 413 return err; 414 } 415 } 416 if (credp->fc_mode != -1) { 417 uint32_t tmp_mode = cpu_to_le32(credp->fc_mode); 418 err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.mode", &tmp_mode, 419 sizeof(mode_t), 0); 420 if (err) { 421 return err; 422 } 423 } 424 if (credp->fc_rdev != -1) { 425 uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev); 426 err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.rdev", &tmp_rdev, 427 sizeof(dev_t), 0); 428 if (err) { 429 return err; 430 } 431 } 432 return 0; 433 } 434 435 static int local_set_cred_passthrough(FsContext *fs_ctx, int dirfd, 436 const char *name, FsCred *credp) 437 { 438 if (fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, 439 AT_SYMLINK_NOFOLLOW) < 0) { 440 /* 441 * If we fail to change ownership and if we are 442 * using security model none. Ignore the error 443 */ 444 if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) { 445 return -1; 446 } 447 } 448 449 return fchmodat_nofollow(dirfd, name, credp->fc_mode & 07777); 450 } 451 452 static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path, 453 char *buf, size_t bufsz) 454 { 455 ssize_t tsize = -1; 456 457 if ((fs_ctx->export_flags & V9FS_SM_MAPPED) || 458 (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) { 459 int fd; 460 461 fd = local_open_nofollow(fs_ctx, fs_path->data, O_RDONLY, 0); 462 if (fd == -1) { 463 return -1; 464 } 465 do { 466 tsize = read(fd, (void *)buf, bufsz); 467 } while (tsize == -1 && errno == EINTR); 468 close_preserve_errno(fd); 469 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || 470 (fs_ctx->export_flags & V9FS_SM_NONE)) { 471 char *dirpath = g_path_get_dirname(fs_path->data); 472 char *name = g_path_get_basename(fs_path->data); 473 int dirfd; 474 475 dirfd = local_opendir_nofollow(fs_ctx, dirpath); 476 if (dirfd == -1) { 477 goto out; 478 } 479 480 tsize = readlinkat(dirfd, name, buf, bufsz); 481 close_preserve_errno(dirfd); 482 out: 483 g_free(name); 484 g_free(dirpath); 485 } 486 return tsize; 487 } 488 489 static int local_close(FsContext *ctx, V9fsFidOpenState *fs) 490 { 491 return close(fs->fd); 492 } 493 494 static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs) 495 { 496 return closedir(fs->dir.stream); 497 } 498 499 static int local_open(FsContext *ctx, V9fsPath *fs_path, 500 int flags, V9fsFidOpenState *fs) 501 { 502 int fd; 503 504 fd = local_open_nofollow(ctx, fs_path->data, flags, 0); 505 if (fd == -1) { 506 return -1; 507 } 508 fs->fd = fd; 509 return fs->fd; 510 } 511 512 static int local_opendir(FsContext *ctx, 513 V9fsPath *fs_path, V9fsFidOpenState *fs) 514 { 515 int dirfd; 516 DIR *stream; 517 518 dirfd = local_opendir_nofollow(ctx, fs_path->data); 519 if (dirfd == -1) { 520 return -1; 521 } 522 523 stream = fdopendir(dirfd); 524 if (!stream) { 525 close(dirfd); 526 return -1; 527 } 528 fs->dir.stream = stream; 529 return 0; 530 } 531 532 static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) 533 { 534 rewinddir(fs->dir.stream); 535 } 536 537 static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs) 538 { 539 return telldir(fs->dir.stream); 540 } 541 542 static bool local_is_mapped_file_metadata(FsContext *fs_ctx, const char *name) 543 { 544 return 545 !strcmp(name, VIRTFS_META_DIR) || !strcmp(name, VIRTFS_META_ROOT_FILE); 546 } 547 548 static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs) 549 { 550 struct dirent *entry; 551 552 again: 553 entry = readdir(fs->dir.stream); 554 if (!entry) { 555 return NULL; 556 } 557 558 if (ctx->export_flags & V9FS_SM_MAPPED) { 559 entry->d_type = DT_UNKNOWN; 560 } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { 561 if (local_is_mapped_file_metadata(ctx, entry->d_name)) { 562 /* skip the meta data */ 563 goto again; 564 } 565 entry->d_type = DT_UNKNOWN; 566 } 567 568 return entry; 569 } 570 571 static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) 572 { 573 seekdir(fs->dir.stream, off); 574 } 575 576 static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs, 577 const struct iovec *iov, 578 int iovcnt, off_t offset) 579 { 580 #ifdef CONFIG_PREADV 581 return preadv(fs->fd, iov, iovcnt, offset); 582 #else 583 int err = lseek(fs->fd, offset, SEEK_SET); 584 if (err == -1) { 585 return err; 586 } else { 587 return readv(fs->fd, iov, iovcnt); 588 } 589 #endif 590 } 591 592 static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs, 593 const struct iovec *iov, 594 int iovcnt, off_t offset) 595 { 596 ssize_t ret; 597 #ifdef CONFIG_PREADV 598 ret = pwritev(fs->fd, iov, iovcnt, offset); 599 #else 600 int err = lseek(fs->fd, offset, SEEK_SET); 601 if (err == -1) { 602 return err; 603 } else { 604 ret = writev(fs->fd, iov, iovcnt); 605 } 606 #endif 607 #ifdef CONFIG_SYNC_FILE_RANGE 608 if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) { 609 /* 610 * Initiate a writeback. This is not a data integrity sync. 611 * We want to ensure that we don't leave dirty pages in the cache 612 * after write when writeout=immediate is sepcified. 613 */ 614 sync_file_range(fs->fd, offset, ret, 615 SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE); 616 } 617 #endif 618 return ret; 619 } 620 621 static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) 622 { 623 char *dirpath = g_path_get_dirname(fs_path->data); 624 char *name = g_path_get_basename(fs_path->data); 625 int ret = -1; 626 int dirfd; 627 628 dirfd = local_opendir_nofollow(fs_ctx, dirpath); 629 if (dirfd == -1) { 630 goto out; 631 } 632 633 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 634 ret = local_set_xattrat(dirfd, name, credp); 635 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 636 ret = local_set_mapped_file_attrat(dirfd, name, credp); 637 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || 638 fs_ctx->export_flags & V9FS_SM_NONE) { 639 ret = fchmodat_nofollow(dirfd, name, credp->fc_mode); 640 } 641 close_preserve_errno(dirfd); 642 643 out: 644 g_free(dirpath); 645 g_free(name); 646 return ret; 647 } 648 649 static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path, 650 const char *name, FsCred *credp) 651 { 652 int err = -1; 653 int dirfd; 654 655 if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && 656 local_is_mapped_file_metadata(fs_ctx, name)) { 657 errno = EINVAL; 658 return -1; 659 } 660 661 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); 662 if (dirfd == -1) { 663 return -1; 664 } 665 666 if (fs_ctx->export_flags & V9FS_SM_MAPPED || 667 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 668 err = mknodat(dirfd, name, fs_ctx->fmode | S_IFREG, 0); 669 if (err == -1) { 670 goto out; 671 } 672 673 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 674 err = local_set_xattrat(dirfd, name, credp); 675 } else { 676 err = local_set_mapped_file_attrat(dirfd, name, credp); 677 } 678 if (err == -1) { 679 goto err_end; 680 } 681 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || 682 fs_ctx->export_flags & V9FS_SM_NONE) { 683 err = mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev); 684 if (err == -1) { 685 goto out; 686 } 687 err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); 688 if (err == -1) { 689 goto err_end; 690 } 691 } 692 goto out; 693 694 err_end: 695 unlinkat_preserve_errno(dirfd, name, 0); 696 out: 697 close_preserve_errno(dirfd); 698 return err; 699 } 700 701 static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path, 702 const char *name, FsCred *credp) 703 { 704 int err = -1; 705 int dirfd; 706 707 if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && 708 local_is_mapped_file_metadata(fs_ctx, name)) { 709 errno = EINVAL; 710 return -1; 711 } 712 713 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); 714 if (dirfd == -1) { 715 return -1; 716 } 717 718 if (fs_ctx->export_flags & V9FS_SM_MAPPED || 719 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 720 err = mkdirat(dirfd, name, fs_ctx->dmode); 721 if (err == -1) { 722 goto out; 723 } 724 credp->fc_mode = credp->fc_mode | S_IFDIR; 725 726 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 727 err = local_set_xattrat(dirfd, name, credp); 728 } else { 729 err = local_set_mapped_file_attrat(dirfd, name, credp); 730 } 731 if (err == -1) { 732 goto err_end; 733 } 734 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || 735 fs_ctx->export_flags & V9FS_SM_NONE) { 736 err = mkdirat(dirfd, name, credp->fc_mode); 737 if (err == -1) { 738 goto out; 739 } 740 err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); 741 if (err == -1) { 742 goto err_end; 743 } 744 } 745 goto out; 746 747 err_end: 748 unlinkat_preserve_errno(dirfd, name, AT_REMOVEDIR); 749 out: 750 close_preserve_errno(dirfd); 751 return err; 752 } 753 754 static int local_fstat(FsContext *fs_ctx, int fid_type, 755 V9fsFidOpenState *fs, struct stat *stbuf) 756 { 757 int err, fd; 758 759 if (fid_type == P9_FID_DIR) { 760 fd = dirfd(fs->dir.stream); 761 } else { 762 fd = fs->fd; 763 } 764 765 err = fstat(fd, stbuf); 766 if (err) { 767 return err; 768 } 769 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 770 /* Actual credentials are part of extended attrs */ 771 uid_t tmp_uid; 772 gid_t tmp_gid; 773 mode_t tmp_mode; 774 dev_t tmp_dev; 775 776 if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) { 777 stbuf->st_uid = le32_to_cpu(tmp_uid); 778 } 779 if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) { 780 stbuf->st_gid = le32_to_cpu(tmp_gid); 781 } 782 if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) { 783 stbuf->st_mode = le32_to_cpu(tmp_mode); 784 } 785 if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) { 786 stbuf->st_rdev = le64_to_cpu(tmp_dev); 787 } 788 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 789 errno = EOPNOTSUPP; 790 return -1; 791 } 792 return err; 793 } 794 795 static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name, 796 int flags, FsCred *credp, V9fsFidOpenState *fs) 797 { 798 int fd = -1; 799 int err = -1; 800 int dirfd; 801 802 if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && 803 local_is_mapped_file_metadata(fs_ctx, name)) { 804 errno = EINVAL; 805 return -1; 806 } 807 808 /* 809 * Mark all the open to not follow symlinks 810 */ 811 flags |= O_NOFOLLOW; 812 813 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); 814 if (dirfd == -1) { 815 return -1; 816 } 817 818 /* Determine the security model */ 819 if (fs_ctx->export_flags & V9FS_SM_MAPPED || 820 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 821 fd = openat_file(dirfd, name, flags, fs_ctx->fmode); 822 if (fd == -1) { 823 goto out; 824 } 825 credp->fc_mode = credp->fc_mode|S_IFREG; 826 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 827 /* Set cleint credentials in xattr */ 828 err = local_set_xattrat(dirfd, name, credp); 829 } else { 830 err = local_set_mapped_file_attrat(dirfd, name, credp); 831 } 832 if (err == -1) { 833 goto err_end; 834 } 835 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || 836 (fs_ctx->export_flags & V9FS_SM_NONE)) { 837 fd = openat_file(dirfd, name, flags, credp->fc_mode); 838 if (fd == -1) { 839 goto out; 840 } 841 err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); 842 if (err == -1) { 843 goto err_end; 844 } 845 } 846 err = fd; 847 fs->fd = fd; 848 goto out; 849 850 err_end: 851 unlinkat_preserve_errno(dirfd, name, 852 flags & O_DIRECTORY ? AT_REMOVEDIR : 0); 853 close_preserve_errno(fd); 854 out: 855 close_preserve_errno(dirfd); 856 return err; 857 } 858 859 860 static int local_symlink(FsContext *fs_ctx, const char *oldpath, 861 V9fsPath *dir_path, const char *name, FsCred *credp) 862 { 863 int err = -1; 864 int dirfd; 865 866 if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && 867 local_is_mapped_file_metadata(fs_ctx, name)) { 868 errno = EINVAL; 869 return -1; 870 } 871 872 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); 873 if (dirfd == -1) { 874 return -1; 875 } 876 877 /* Determine the security model */ 878 if (fs_ctx->export_flags & V9FS_SM_MAPPED || 879 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 880 int fd; 881 ssize_t oldpath_size, write_size; 882 883 fd = openat_file(dirfd, name, O_CREAT | O_EXCL | O_RDWR, 884 fs_ctx->fmode); 885 if (fd == -1) { 886 goto out; 887 } 888 /* Write the oldpath (target) to the file. */ 889 oldpath_size = strlen(oldpath); 890 do { 891 write_size = write(fd, (void *)oldpath, oldpath_size); 892 } while (write_size == -1 && errno == EINTR); 893 close_preserve_errno(fd); 894 895 if (write_size != oldpath_size) { 896 goto err_end; 897 } 898 /* Set cleint credentials in symlink's xattr */ 899 credp->fc_mode = credp->fc_mode | S_IFLNK; 900 901 if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 902 err = local_set_xattrat(dirfd, name, credp); 903 } else { 904 err = local_set_mapped_file_attrat(dirfd, name, credp); 905 } 906 if (err == -1) { 907 goto err_end; 908 } 909 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || 910 fs_ctx->export_flags & V9FS_SM_NONE) { 911 err = symlinkat(oldpath, dirfd, name); 912 if (err) { 913 goto out; 914 } 915 err = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, 916 AT_SYMLINK_NOFOLLOW); 917 if (err == -1) { 918 /* 919 * If we fail to change ownership and if we are 920 * using security model none. Ignore the error 921 */ 922 if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) { 923 goto err_end; 924 } else { 925 err = 0; 926 } 927 } 928 } 929 goto out; 930 931 err_end: 932 unlinkat_preserve_errno(dirfd, name, 0); 933 out: 934 close_preserve_errno(dirfd); 935 return err; 936 } 937 938 static int local_link(FsContext *ctx, V9fsPath *oldpath, 939 V9fsPath *dirpath, const char *name) 940 { 941 char *odirpath = g_path_get_dirname(oldpath->data); 942 char *oname = g_path_get_basename(oldpath->data); 943 int ret = -1; 944 int odirfd, ndirfd; 945 946 if (ctx->export_flags & V9FS_SM_MAPPED_FILE && 947 local_is_mapped_file_metadata(ctx, name)) { 948 errno = EINVAL; 949 return -1; 950 } 951 952 odirfd = local_opendir_nofollow(ctx, odirpath); 953 if (odirfd == -1) { 954 goto out; 955 } 956 957 ndirfd = local_opendir_nofollow(ctx, dirpath->data); 958 if (ndirfd == -1) { 959 close_preserve_errno(odirfd); 960 goto out; 961 } 962 963 ret = linkat(odirfd, oname, ndirfd, name, 0); 964 if (ret < 0) { 965 goto out_close; 966 } 967 968 /* now link the virtfs_metadata files */ 969 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { 970 int omap_dirfd, nmap_dirfd; 971 972 ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700); 973 if (ret < 0 && errno != EEXIST) { 974 goto err_undo_link; 975 } 976 977 omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR); 978 if (omap_dirfd == -1) { 979 goto err; 980 } 981 982 nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR); 983 if (nmap_dirfd == -1) { 984 close_preserve_errno(omap_dirfd); 985 goto err; 986 } 987 988 ret = linkat(omap_dirfd, oname, nmap_dirfd, name, 0); 989 close_preserve_errno(nmap_dirfd); 990 close_preserve_errno(omap_dirfd); 991 if (ret < 0 && errno != ENOENT) { 992 goto err_undo_link; 993 } 994 995 ret = 0; 996 } 997 goto out_close; 998 999 err: 1000 ret = -1; 1001 err_undo_link: 1002 unlinkat_preserve_errno(ndirfd, name, 0); 1003 out_close: 1004 close_preserve_errno(ndirfd); 1005 close_preserve_errno(odirfd); 1006 out: 1007 g_free(oname); 1008 g_free(odirpath); 1009 return ret; 1010 } 1011 1012 static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size) 1013 { 1014 int fd, ret; 1015 1016 fd = local_open_nofollow(ctx, fs_path->data, O_WRONLY, 0); 1017 if (fd == -1) { 1018 return -1; 1019 } 1020 ret = ftruncate(fd, size); 1021 close_preserve_errno(fd); 1022 return ret; 1023 } 1024 1025 static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) 1026 { 1027 char *dirpath = g_path_get_dirname(fs_path->data); 1028 char *name = g_path_get_basename(fs_path->data); 1029 int ret = -1; 1030 int dirfd; 1031 1032 dirfd = local_opendir_nofollow(fs_ctx, dirpath); 1033 if (dirfd == -1) { 1034 goto out; 1035 } 1036 1037 if ((credp->fc_uid == -1 && credp->fc_gid == -1) || 1038 (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || 1039 (fs_ctx->export_flags & V9FS_SM_NONE)) { 1040 ret = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, 1041 AT_SYMLINK_NOFOLLOW); 1042 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) { 1043 ret = local_set_xattrat(dirfd, name, credp); 1044 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { 1045 ret = local_set_mapped_file_attrat(dirfd, name, credp); 1046 } 1047 1048 close_preserve_errno(dirfd); 1049 out: 1050 g_free(name); 1051 g_free(dirpath); 1052 return ret; 1053 } 1054 1055 static int local_utimensat(FsContext *s, V9fsPath *fs_path, 1056 const struct timespec *buf) 1057 { 1058 char *dirpath = g_path_get_dirname(fs_path->data); 1059 char *name = g_path_get_basename(fs_path->data); 1060 int dirfd, ret = -1; 1061 1062 dirfd = local_opendir_nofollow(s, dirpath); 1063 if (dirfd == -1) { 1064 goto out; 1065 } 1066 1067 ret = utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW); 1068 close_preserve_errno(dirfd); 1069 out: 1070 g_free(dirpath); 1071 g_free(name); 1072 return ret; 1073 } 1074 1075 static int local_unlinkat_common(FsContext *ctx, int dirfd, const char *name, 1076 int flags) 1077 { 1078 int ret = -1; 1079 1080 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { 1081 int map_dirfd; 1082 1083 /* We need to remove the metadata as well: 1084 * - the metadata directory if we're removing a directory 1085 * - the metadata file in the parent's metadata directory 1086 * 1087 * If any of these are missing (ie, ENOENT) then we're probably 1088 * trying to remove something that wasn't created in mapped-file 1089 * mode. We just ignore the error. 1090 */ 1091 if (flags == AT_REMOVEDIR) { 1092 int fd; 1093 1094 fd = openat_dir(dirfd, name); 1095 if (fd == -1) { 1096 goto err_out; 1097 } 1098 ret = unlinkat(fd, VIRTFS_META_DIR, AT_REMOVEDIR); 1099 close_preserve_errno(fd); 1100 if (ret < 0 && errno != ENOENT) { 1101 goto err_out; 1102 } 1103 } 1104 map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR); 1105 if (map_dirfd != -1) { 1106 ret = unlinkat(map_dirfd, name, 0); 1107 close_preserve_errno(map_dirfd); 1108 if (ret < 0 && errno != ENOENT) { 1109 goto err_out; 1110 } 1111 } else if (errno != ENOENT) { 1112 goto err_out; 1113 } 1114 } 1115 1116 ret = unlinkat(dirfd, name, flags); 1117 err_out: 1118 return ret; 1119 } 1120 1121 static int local_remove(FsContext *ctx, const char *path) 1122 { 1123 struct stat stbuf; 1124 char *dirpath = g_path_get_dirname(path); 1125 char *name = g_path_get_basename(path); 1126 int flags = 0; 1127 int dirfd; 1128 int err = -1; 1129 1130 dirfd = local_opendir_nofollow(ctx, dirpath); 1131 if (dirfd == -1) { 1132 goto out; 1133 } 1134 1135 if (fstatat(dirfd, name, &stbuf, AT_SYMLINK_NOFOLLOW) < 0) { 1136 goto err_out; 1137 } 1138 1139 if (S_ISDIR(stbuf.st_mode)) { 1140 flags |= AT_REMOVEDIR; 1141 } 1142 1143 err = local_unlinkat_common(ctx, dirfd, name, flags); 1144 err_out: 1145 close_preserve_errno(dirfd); 1146 out: 1147 g_free(name); 1148 g_free(dirpath); 1149 return err; 1150 } 1151 1152 static int local_fsync(FsContext *ctx, int fid_type, 1153 V9fsFidOpenState *fs, int datasync) 1154 { 1155 int fd; 1156 1157 if (fid_type == P9_FID_DIR) { 1158 fd = dirfd(fs->dir.stream); 1159 } else { 1160 fd = fs->fd; 1161 } 1162 1163 if (datasync) { 1164 return qemu_fdatasync(fd); 1165 } else { 1166 return fsync(fd); 1167 } 1168 } 1169 1170 static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf) 1171 { 1172 int fd, ret; 1173 1174 fd = local_open_nofollow(s, fs_path->data, O_RDONLY, 0); 1175 if (fd == -1) { 1176 return -1; 1177 } 1178 ret = fstatfs(fd, stbuf); 1179 close_preserve_errno(fd); 1180 return ret; 1181 } 1182 1183 static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path, 1184 const char *name, void *value, size_t size) 1185 { 1186 char *path = fs_path->data; 1187 1188 return v9fs_get_xattr(ctx, path, name, value, size); 1189 } 1190 1191 static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path, 1192 void *value, size_t size) 1193 { 1194 char *path = fs_path->data; 1195 1196 return v9fs_list_xattr(ctx, path, value, size); 1197 } 1198 1199 static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name, 1200 void *value, size_t size, int flags) 1201 { 1202 char *path = fs_path->data; 1203 1204 return v9fs_set_xattr(ctx, path, name, value, size, flags); 1205 } 1206 1207 static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path, 1208 const char *name) 1209 { 1210 char *path = fs_path->data; 1211 1212 return v9fs_remove_xattr(ctx, path, name); 1213 } 1214 1215 static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path, 1216 const char *name, V9fsPath *target) 1217 { 1218 if (ctx->export_flags & V9FS_SM_MAPPED_FILE && 1219 local_is_mapped_file_metadata(ctx, name)) { 1220 errno = EINVAL; 1221 return -1; 1222 } 1223 1224 if (dir_path) { 1225 if (!strcmp(name, ".")) { 1226 /* "." relative to "foo/bar" is "foo/bar" */ 1227 v9fs_path_copy(target, dir_path); 1228 } else if (!strcmp(name, "..")) { 1229 if (!strcmp(dir_path->data, ".")) { 1230 /* ".." relative to the root is "." */ 1231 v9fs_path_sprintf(target, "."); 1232 } else { 1233 char *tmp = g_path_get_dirname(dir_path->data); 1234 /* Symbolic links are resolved by the client. We can assume 1235 * that ".." relative to "foo/bar" is equivalent to "foo" 1236 */ 1237 v9fs_path_sprintf(target, "%s", tmp); 1238 g_free(tmp); 1239 } 1240 } else { 1241 assert(!strchr(name, '/')); 1242 v9fs_path_sprintf(target, "%s/%s", dir_path->data, name); 1243 } 1244 } else if (!strcmp(name, "/") || !strcmp(name, ".") || 1245 !strcmp(name, "..")) { 1246 /* This is the root fid */ 1247 v9fs_path_sprintf(target, "."); 1248 } else { 1249 assert(!strchr(name, '/')); 1250 v9fs_path_sprintf(target, "./%s", name); 1251 } 1252 return 0; 1253 } 1254 1255 static int local_renameat(FsContext *ctx, V9fsPath *olddir, 1256 const char *old_name, V9fsPath *newdir, 1257 const char *new_name) 1258 { 1259 int ret; 1260 int odirfd, ndirfd; 1261 1262 if (ctx->export_flags & V9FS_SM_MAPPED_FILE && 1263 (local_is_mapped_file_metadata(ctx, old_name) || 1264 local_is_mapped_file_metadata(ctx, new_name))) { 1265 errno = EINVAL; 1266 return -1; 1267 } 1268 1269 odirfd = local_opendir_nofollow(ctx, olddir->data); 1270 if (odirfd == -1) { 1271 return -1; 1272 } 1273 1274 ndirfd = local_opendir_nofollow(ctx, newdir->data); 1275 if (ndirfd == -1) { 1276 close_preserve_errno(odirfd); 1277 return -1; 1278 } 1279 1280 ret = renameat(odirfd, old_name, ndirfd, new_name); 1281 if (ret < 0) { 1282 goto out; 1283 } 1284 1285 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { 1286 int omap_dirfd, nmap_dirfd; 1287 1288 ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700); 1289 if (ret < 0 && errno != EEXIST) { 1290 goto err_undo_rename; 1291 } 1292 1293 omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR); 1294 if (omap_dirfd == -1) { 1295 goto err; 1296 } 1297 1298 nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR); 1299 if (nmap_dirfd == -1) { 1300 close_preserve_errno(omap_dirfd); 1301 goto err; 1302 } 1303 1304 /* rename the .virtfs_metadata files */ 1305 ret = renameat(omap_dirfd, old_name, nmap_dirfd, new_name); 1306 close_preserve_errno(nmap_dirfd); 1307 close_preserve_errno(omap_dirfd); 1308 if (ret < 0 && errno != ENOENT) { 1309 goto err_undo_rename; 1310 } 1311 1312 ret = 0; 1313 } 1314 goto out; 1315 1316 err: 1317 ret = -1; 1318 err_undo_rename: 1319 renameat_preserve_errno(ndirfd, new_name, odirfd, old_name); 1320 out: 1321 close_preserve_errno(ndirfd); 1322 close_preserve_errno(odirfd); 1323 return ret; 1324 } 1325 1326 static void v9fs_path_init_dirname(V9fsPath *path, const char *str) 1327 { 1328 path->data = g_path_get_dirname(str); 1329 path->size = strlen(path->data) + 1; 1330 } 1331 1332 static int local_rename(FsContext *ctx, const char *oldpath, 1333 const char *newpath) 1334 { 1335 int err; 1336 char *oname = g_path_get_basename(oldpath); 1337 char *nname = g_path_get_basename(newpath); 1338 V9fsPath olddir, newdir; 1339 1340 v9fs_path_init_dirname(&olddir, oldpath); 1341 v9fs_path_init_dirname(&newdir, newpath); 1342 1343 err = local_renameat(ctx, &olddir, oname, &newdir, nname); 1344 1345 v9fs_path_free(&newdir); 1346 v9fs_path_free(&olddir); 1347 g_free(nname); 1348 g_free(oname); 1349 1350 return err; 1351 } 1352 1353 static int local_unlinkat(FsContext *ctx, V9fsPath *dir, 1354 const char *name, int flags) 1355 { 1356 int ret; 1357 int dirfd; 1358 1359 if (ctx->export_flags & V9FS_SM_MAPPED_FILE && 1360 local_is_mapped_file_metadata(ctx, name)) { 1361 errno = EINVAL; 1362 return -1; 1363 } 1364 1365 dirfd = local_opendir_nofollow(ctx, dir->data); 1366 if (dirfd == -1) { 1367 return -1; 1368 } 1369 1370 ret = local_unlinkat_common(ctx, dirfd, name, flags); 1371 close_preserve_errno(dirfd); 1372 return ret; 1373 } 1374 1375 static int local_ioc_getversion(FsContext *ctx, V9fsPath *path, 1376 mode_t st_mode, uint64_t *st_gen) 1377 { 1378 #ifdef FS_IOC_GETVERSION 1379 int err; 1380 V9fsFidOpenState fid_open; 1381 1382 /* 1383 * Do not try to open special files like device nodes, fifos etc 1384 * We can get fd for regular files and directories only 1385 */ 1386 if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) { 1387 errno = ENOTTY; 1388 return -1; 1389 } 1390 err = local_open(ctx, path, O_RDONLY, &fid_open); 1391 if (err < 0) { 1392 return err; 1393 } 1394 err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen); 1395 local_close(ctx, &fid_open); 1396 return err; 1397 #else 1398 errno = ENOTTY; 1399 return -1; 1400 #endif 1401 } 1402 1403 static int local_init(FsContext *ctx) 1404 { 1405 struct statfs stbuf; 1406 LocalData *data = g_malloc(sizeof(*data)); 1407 1408 data->mountfd = open(ctx->fs_root, O_DIRECTORY | O_RDONLY); 1409 if (data->mountfd == -1) { 1410 goto err; 1411 } 1412 1413 #ifdef FS_IOC_GETVERSION 1414 /* 1415 * use ioc_getversion only if the ioctl is definied 1416 */ 1417 if (fstatfs(data->mountfd, &stbuf) < 0) { 1418 close_preserve_errno(data->mountfd); 1419 goto err; 1420 } 1421 switch (stbuf.f_type) { 1422 case EXT2_SUPER_MAGIC: 1423 case BTRFS_SUPER_MAGIC: 1424 case REISERFS_SUPER_MAGIC: 1425 case XFS_SUPER_MAGIC: 1426 ctx->exops.get_st_gen = local_ioc_getversion; 1427 break; 1428 } 1429 #endif 1430 1431 if (ctx->export_flags & V9FS_SM_PASSTHROUGH) { 1432 ctx->xops = passthrough_xattr_ops; 1433 } else if (ctx->export_flags & V9FS_SM_MAPPED) { 1434 ctx->xops = mapped_xattr_ops; 1435 } else if (ctx->export_flags & V9FS_SM_NONE) { 1436 ctx->xops = none_xattr_ops; 1437 } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { 1438 /* 1439 * xattr operation for mapped-file and passthrough 1440 * remain same. 1441 */ 1442 ctx->xops = passthrough_xattr_ops; 1443 } 1444 ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT; 1445 1446 ctx->private = data; 1447 return 0; 1448 1449 err: 1450 g_free(data); 1451 return -1; 1452 } 1453 1454 static void local_cleanup(FsContext *ctx) 1455 { 1456 LocalData *data = ctx->private; 1457 1458 close(data->mountfd); 1459 g_free(data); 1460 } 1461 1462 static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse) 1463 { 1464 const char *sec_model = qemu_opt_get(opts, "security_model"); 1465 const char *path = qemu_opt_get(opts, "path"); 1466 Error *err = NULL; 1467 1468 if (!sec_model) { 1469 error_report("Security model not specified, local fs needs security model"); 1470 error_printf("valid options are:" 1471 "\tsecurity_model=[passthrough|mapped-xattr|mapped-file|none]\n"); 1472 return -1; 1473 } 1474 1475 if (!strcmp(sec_model, "passthrough")) { 1476 fse->export_flags |= V9FS_SM_PASSTHROUGH; 1477 } else if (!strcmp(sec_model, "mapped") || 1478 !strcmp(sec_model, "mapped-xattr")) { 1479 fse->export_flags |= V9FS_SM_MAPPED; 1480 } else if (!strcmp(sec_model, "none")) { 1481 fse->export_flags |= V9FS_SM_NONE; 1482 } else if (!strcmp(sec_model, "mapped-file")) { 1483 fse->export_flags |= V9FS_SM_MAPPED_FILE; 1484 } else { 1485 error_report("Invalid security model %s specified", sec_model); 1486 error_printf("valid options are:" 1487 "\t[passthrough|mapped-xattr|mapped-file|none]\n"); 1488 return -1; 1489 } 1490 1491 if (!path) { 1492 error_report("fsdev: No path specified"); 1493 return -1; 1494 } 1495 1496 fsdev_throttle_parse_opts(opts, &fse->fst, &err); 1497 if (err) { 1498 error_reportf_err(err, "Throttle configuration is not valid: "); 1499 return -1; 1500 } 1501 1502 if (fse->export_flags & V9FS_SM_MAPPED || 1503 fse->export_flags & V9FS_SM_MAPPED_FILE) { 1504 fse->fmode = 1505 qemu_opt_get_number(opts, "fmode", SM_LOCAL_MODE_BITS) & 0777; 1506 fse->dmode = 1507 qemu_opt_get_number(opts, "dmode", SM_LOCAL_DIR_MODE_BITS) & 0777; 1508 } else { 1509 if (qemu_opt_find(opts, "fmode")) { 1510 error_report("fmode is only valid for mapped 9p modes"); 1511 return -1; 1512 } 1513 if (qemu_opt_find(opts, "dmode")) { 1514 error_report("dmode is only valid for mapped 9p modes"); 1515 return -1; 1516 } 1517 } 1518 1519 fse->path = g_strdup(path); 1520 1521 return 0; 1522 } 1523 1524 FileOperations local_ops = { 1525 .parse_opts = local_parse_opts, 1526 .init = local_init, 1527 .cleanup = local_cleanup, 1528 .lstat = local_lstat, 1529 .readlink = local_readlink, 1530 .close = local_close, 1531 .closedir = local_closedir, 1532 .open = local_open, 1533 .opendir = local_opendir, 1534 .rewinddir = local_rewinddir, 1535 .telldir = local_telldir, 1536 .readdir = local_readdir, 1537 .seekdir = local_seekdir, 1538 .preadv = local_preadv, 1539 .pwritev = local_pwritev, 1540 .chmod = local_chmod, 1541 .mknod = local_mknod, 1542 .mkdir = local_mkdir, 1543 .fstat = local_fstat, 1544 .open2 = local_open2, 1545 .symlink = local_symlink, 1546 .link = local_link, 1547 .truncate = local_truncate, 1548 .rename = local_rename, 1549 .chown = local_chown, 1550 .utimensat = local_utimensat, 1551 .remove = local_remove, 1552 .fsync = local_fsync, 1553 .statfs = local_statfs, 1554 .lgetxattr = local_lgetxattr, 1555 .llistxattr = local_llistxattr, 1556 .lsetxattr = local_lsetxattr, 1557 .lremovexattr = local_lremovexattr, 1558 .name_to_path = local_name_to_path, 1559 .renameat = local_renameat, 1560 .unlinkat = local_unlinkat, 1561 }; 1562