1 /* 2 * Virtio 9p backend 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 "hw/virtio/virtio.h" 16 #include "qapi/error.h" 17 #include "qemu/error-report.h" 18 #include "qemu/iov.h" 19 #include "qemu/sockets.h" 20 #include "virtio-9p.h" 21 #include "fsdev/qemu-fsdev.h" 22 #include "9p-xattr.h" 23 #include "coth.h" 24 #include "trace.h" 25 #include "migration/migration.h" 26 27 int open_fd_hw; 28 int total_open_fd; 29 static int open_fd_rc; 30 31 enum { 32 Oread = 0x00, 33 Owrite = 0x01, 34 Ordwr = 0x02, 35 Oexec = 0x03, 36 Oexcl = 0x04, 37 Otrunc = 0x10, 38 Orexec = 0x20, 39 Orclose = 0x40, 40 Oappend = 0x80, 41 }; 42 43 ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 44 { 45 ssize_t ret; 46 va_list ap; 47 48 va_start(ap, fmt); 49 ret = virtio_pdu_vmarshal(pdu, offset, fmt, ap); 50 va_end(ap); 51 52 return ret; 53 } 54 55 ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 56 { 57 ssize_t ret; 58 va_list ap; 59 60 va_start(ap, fmt); 61 ret = virtio_pdu_vunmarshal(pdu, offset, fmt, ap); 62 va_end(ap); 63 64 return ret; 65 } 66 67 static void pdu_push_and_notify(V9fsPDU *pdu) 68 { 69 virtio_9p_push_and_notify(pdu); 70 } 71 72 static int omode_to_uflags(int8_t mode) 73 { 74 int ret = 0; 75 76 switch (mode & 3) { 77 case Oread: 78 ret = O_RDONLY; 79 break; 80 case Ordwr: 81 ret = O_RDWR; 82 break; 83 case Owrite: 84 ret = O_WRONLY; 85 break; 86 case Oexec: 87 ret = O_RDONLY; 88 break; 89 } 90 91 if (mode & Otrunc) { 92 ret |= O_TRUNC; 93 } 94 95 if (mode & Oappend) { 96 ret |= O_APPEND; 97 } 98 99 if (mode & Oexcl) { 100 ret |= O_EXCL; 101 } 102 103 return ret; 104 } 105 106 struct dotl_openflag_map { 107 int dotl_flag; 108 int open_flag; 109 }; 110 111 static int dotl_to_open_flags(int flags) 112 { 113 int i; 114 /* 115 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 116 * and P9_DOTL_NOACCESS 117 */ 118 int oflags = flags & O_ACCMODE; 119 120 struct dotl_openflag_map dotl_oflag_map[] = { 121 { P9_DOTL_CREATE, O_CREAT }, 122 { P9_DOTL_EXCL, O_EXCL }, 123 { P9_DOTL_NOCTTY , O_NOCTTY }, 124 { P9_DOTL_TRUNC, O_TRUNC }, 125 { P9_DOTL_APPEND, O_APPEND }, 126 { P9_DOTL_NONBLOCK, O_NONBLOCK } , 127 { P9_DOTL_DSYNC, O_DSYNC }, 128 { P9_DOTL_FASYNC, FASYNC }, 129 { P9_DOTL_DIRECT, O_DIRECT }, 130 { P9_DOTL_LARGEFILE, O_LARGEFILE }, 131 { P9_DOTL_DIRECTORY, O_DIRECTORY }, 132 { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, 133 { P9_DOTL_NOATIME, O_NOATIME }, 134 { P9_DOTL_SYNC, O_SYNC }, 135 }; 136 137 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 138 if (flags & dotl_oflag_map[i].dotl_flag) { 139 oflags |= dotl_oflag_map[i].open_flag; 140 } 141 } 142 143 return oflags; 144 } 145 146 void cred_init(FsCred *credp) 147 { 148 credp->fc_uid = -1; 149 credp->fc_gid = -1; 150 credp->fc_mode = -1; 151 credp->fc_rdev = -1; 152 } 153 154 static int get_dotl_openflags(V9fsState *s, int oflags) 155 { 156 int flags; 157 /* 158 * Filter the client open flags 159 */ 160 flags = dotl_to_open_flags(oflags); 161 flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); 162 /* 163 * Ignore direct disk access hint until the server supports it. 164 */ 165 flags &= ~O_DIRECT; 166 return flags; 167 } 168 169 void v9fs_path_init(V9fsPath *path) 170 { 171 path->data = NULL; 172 path->size = 0; 173 } 174 175 void v9fs_path_free(V9fsPath *path) 176 { 177 g_free(path->data); 178 path->data = NULL; 179 path->size = 0; 180 } 181 182 void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs) 183 { 184 v9fs_path_free(lhs); 185 lhs->data = g_malloc(rhs->size); 186 memcpy(lhs->data, rhs->data, rhs->size); 187 lhs->size = rhs->size; 188 } 189 190 int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 191 const char *name, V9fsPath *path) 192 { 193 int err; 194 err = s->ops->name_to_path(&s->ctx, dirpath, name, path); 195 if (err < 0) { 196 err = -errno; 197 } 198 return err; 199 } 200 201 /* 202 * Return TRUE if s1 is an ancestor of s2. 203 * 204 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". 205 * As a special case, We treat s1 as ancestor of s2 if they are same! 206 */ 207 static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) 208 { 209 if (!strncmp(s1->data, s2->data, s1->size - 1)) { 210 if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { 211 return 1; 212 } 213 } 214 return 0; 215 } 216 217 static size_t v9fs_string_size(V9fsString *str) 218 { 219 return str->size; 220 } 221 222 /* 223 * returns 0 if fid got re-opened, 1 if not, < 0 on error */ 224 static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) 225 { 226 int err = 1; 227 if (f->fid_type == P9_FID_FILE) { 228 if (f->fs.fd == -1) { 229 do { 230 err = v9fs_co_open(pdu, f, f->open_flags); 231 } while (err == -EINTR && !pdu->cancelled); 232 } 233 } else if (f->fid_type == P9_FID_DIR) { 234 if (f->fs.dir.stream == NULL) { 235 do { 236 err = v9fs_co_opendir(pdu, f); 237 } while (err == -EINTR && !pdu->cancelled); 238 } 239 } 240 return err; 241 } 242 243 static V9fsFidState *get_fid(V9fsPDU *pdu, int32_t fid) 244 { 245 int err; 246 V9fsFidState *f; 247 V9fsState *s = pdu->s; 248 249 for (f = s->fid_list; f; f = f->next) { 250 BUG_ON(f->clunked); 251 if (f->fid == fid) { 252 /* 253 * Update the fid ref upfront so that 254 * we don't get reclaimed when we yield 255 * in open later. 256 */ 257 f->ref++; 258 /* 259 * check whether we need to reopen the 260 * file. We might have closed the fd 261 * while trying to free up some file 262 * descriptors. 263 */ 264 err = v9fs_reopen_fid(pdu, f); 265 if (err < 0) { 266 f->ref--; 267 return NULL; 268 } 269 /* 270 * Mark the fid as referenced so that the LRU 271 * reclaim won't close the file descriptor 272 */ 273 f->flags |= FID_REFERENCED; 274 return f; 275 } 276 } 277 return NULL; 278 } 279 280 static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) 281 { 282 V9fsFidState *f; 283 284 for (f = s->fid_list; f; f = f->next) { 285 /* If fid is already there return NULL */ 286 BUG_ON(f->clunked); 287 if (f->fid == fid) { 288 return NULL; 289 } 290 } 291 f = g_malloc0(sizeof(V9fsFidState)); 292 f->fid = fid; 293 f->fid_type = P9_FID_NONE; 294 f->ref = 1; 295 /* 296 * Mark the fid as referenced so that the LRU 297 * reclaim won't close the file descriptor 298 */ 299 f->flags |= FID_REFERENCED; 300 f->next = s->fid_list; 301 s->fid_list = f; 302 303 v9fs_readdir_init(&f->fs.dir); 304 v9fs_readdir_init(&f->fs_reclaim.dir); 305 306 return f; 307 } 308 309 static int v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) 310 { 311 int retval = 0; 312 313 if (fidp->fs.xattr.copied_len == -1) { 314 /* getxattr/listxattr fid */ 315 goto free_value; 316 } 317 /* 318 * if this is fid for setxattr. clunk should 319 * result in setxattr localcall 320 */ 321 if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { 322 /* clunk after partial write */ 323 retval = -EINVAL; 324 goto free_out; 325 } 326 if (fidp->fs.xattr.len) { 327 retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, 328 fidp->fs.xattr.value, 329 fidp->fs.xattr.len, 330 fidp->fs.xattr.flags); 331 } else { 332 retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); 333 } 334 free_out: 335 v9fs_string_free(&fidp->fs.xattr.name); 336 free_value: 337 g_free(fidp->fs.xattr.value); 338 return retval; 339 } 340 341 static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp) 342 { 343 int retval = 0; 344 345 if (fidp->fid_type == P9_FID_FILE) { 346 /* If we reclaimed the fd no need to close */ 347 if (fidp->fs.fd != -1) { 348 retval = v9fs_co_close(pdu, &fidp->fs); 349 } 350 } else if (fidp->fid_type == P9_FID_DIR) { 351 if (fidp->fs.dir.stream != NULL) { 352 retval = v9fs_co_closedir(pdu, &fidp->fs); 353 } 354 } else if (fidp->fid_type == P9_FID_XATTR) { 355 retval = v9fs_xattr_fid_clunk(pdu, fidp); 356 } 357 v9fs_path_free(&fidp->path); 358 g_free(fidp); 359 return retval; 360 } 361 362 static int put_fid(V9fsPDU *pdu, V9fsFidState *fidp) 363 { 364 BUG_ON(!fidp->ref); 365 fidp->ref--; 366 /* 367 * Don't free the fid if it is in reclaim list 368 */ 369 if (!fidp->ref && fidp->clunked) { 370 if (fidp->fid == pdu->s->root_fid) { 371 /* 372 * if the clunked fid is root fid then we 373 * have unmounted the fs on the client side. 374 * delete the migration blocker. Ideally, this 375 * should be hooked to transport close notification 376 */ 377 if (pdu->s->migration_blocker) { 378 migrate_del_blocker(pdu->s->migration_blocker); 379 error_free(pdu->s->migration_blocker); 380 pdu->s->migration_blocker = NULL; 381 } 382 } 383 return free_fid(pdu, fidp); 384 } 385 return 0; 386 } 387 388 static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) 389 { 390 V9fsFidState **fidpp, *fidp; 391 392 for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { 393 if ((*fidpp)->fid == fid) { 394 break; 395 } 396 } 397 if (*fidpp == NULL) { 398 return NULL; 399 } 400 fidp = *fidpp; 401 *fidpp = fidp->next; 402 fidp->clunked = 1; 403 return fidp; 404 } 405 406 void v9fs_reclaim_fd(V9fsPDU *pdu) 407 { 408 int reclaim_count = 0; 409 V9fsState *s = pdu->s; 410 V9fsFidState *f, *reclaim_list = NULL; 411 412 for (f = s->fid_list; f; f = f->next) { 413 /* 414 * Unlink fids cannot be reclaimed. Check 415 * for them and skip them. Also skip fids 416 * currently being operated on. 417 */ 418 if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 419 continue; 420 } 421 /* 422 * if it is a recently referenced fid 423 * we leave the fid untouched and clear the 424 * reference bit. We come back to it later 425 * in the next iteration. (a simple LRU without 426 * moving list elements around) 427 */ 428 if (f->flags & FID_REFERENCED) { 429 f->flags &= ~FID_REFERENCED; 430 continue; 431 } 432 /* 433 * Add fids to reclaim list. 434 */ 435 if (f->fid_type == P9_FID_FILE) { 436 if (f->fs.fd != -1) { 437 /* 438 * Up the reference count so that 439 * a clunk request won't free this fid 440 */ 441 f->ref++; 442 f->rclm_lst = reclaim_list; 443 reclaim_list = f; 444 f->fs_reclaim.fd = f->fs.fd; 445 f->fs.fd = -1; 446 reclaim_count++; 447 } 448 } else if (f->fid_type == P9_FID_DIR) { 449 if (f->fs.dir.stream != NULL) { 450 /* 451 * Up the reference count so that 452 * a clunk request won't free this fid 453 */ 454 f->ref++; 455 f->rclm_lst = reclaim_list; 456 reclaim_list = f; 457 f->fs_reclaim.dir.stream = f->fs.dir.stream; 458 f->fs.dir.stream = NULL; 459 reclaim_count++; 460 } 461 } 462 if (reclaim_count >= open_fd_rc) { 463 break; 464 } 465 } 466 /* 467 * Now close the fid in reclaim list. Free them if they 468 * are already clunked. 469 */ 470 while (reclaim_list) { 471 f = reclaim_list; 472 reclaim_list = f->rclm_lst; 473 if (f->fid_type == P9_FID_FILE) { 474 v9fs_co_close(pdu, &f->fs_reclaim); 475 } else if (f->fid_type == P9_FID_DIR) { 476 v9fs_co_closedir(pdu, &f->fs_reclaim); 477 } 478 f->rclm_lst = NULL; 479 /* 480 * Now drop the fid reference, free it 481 * if clunked. 482 */ 483 put_fid(pdu, f); 484 } 485 } 486 487 static int v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 488 { 489 int err; 490 V9fsState *s = pdu->s; 491 V9fsFidState *fidp, head_fid; 492 493 head_fid.next = s->fid_list; 494 for (fidp = s->fid_list; fidp; fidp = fidp->next) { 495 if (fidp->path.size != path->size) { 496 continue; 497 } 498 if (!memcmp(fidp->path.data, path->data, path->size)) { 499 /* Mark the fid non reclaimable. */ 500 fidp->flags |= FID_NON_RECLAIMABLE; 501 502 /* reopen the file/dir if already closed */ 503 err = v9fs_reopen_fid(pdu, fidp); 504 if (err < 0) { 505 return -1; 506 } 507 /* 508 * Go back to head of fid list because 509 * the list could have got updated when 510 * switched to the worker thread 511 */ 512 if (err == 0) { 513 fidp = &head_fid; 514 } 515 } 516 } 517 return 0; 518 } 519 520 static void virtfs_reset(V9fsPDU *pdu) 521 { 522 V9fsState *s = pdu->s; 523 V9fsFidState *fidp = NULL; 524 525 /* Free all fids */ 526 while (s->fid_list) { 527 fidp = s->fid_list; 528 s->fid_list = fidp->next; 529 530 if (fidp->ref) { 531 fidp->clunked = 1; 532 } else { 533 free_fid(pdu, fidp); 534 } 535 } 536 if (fidp) { 537 /* One or more unclunked fids found... */ 538 error_report("9pfs:%s: One or more uncluncked fids " 539 "found during reset", __func__); 540 } 541 } 542 543 #define P9_QID_TYPE_DIR 0x80 544 #define P9_QID_TYPE_SYMLINK 0x02 545 546 #define P9_STAT_MODE_DIR 0x80000000 547 #define P9_STAT_MODE_APPEND 0x40000000 548 #define P9_STAT_MODE_EXCL 0x20000000 549 #define P9_STAT_MODE_MOUNT 0x10000000 550 #define P9_STAT_MODE_AUTH 0x08000000 551 #define P9_STAT_MODE_TMP 0x04000000 552 #define P9_STAT_MODE_SYMLINK 0x02000000 553 #define P9_STAT_MODE_LINK 0x01000000 554 #define P9_STAT_MODE_DEVICE 0x00800000 555 #define P9_STAT_MODE_NAMED_PIPE 0x00200000 556 #define P9_STAT_MODE_SOCKET 0x00100000 557 #define P9_STAT_MODE_SETUID 0x00080000 558 #define P9_STAT_MODE_SETGID 0x00040000 559 #define P9_STAT_MODE_SETVTX 0x00010000 560 561 #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 562 P9_STAT_MODE_SYMLINK | \ 563 P9_STAT_MODE_LINK | \ 564 P9_STAT_MODE_DEVICE | \ 565 P9_STAT_MODE_NAMED_PIPE | \ 566 P9_STAT_MODE_SOCKET) 567 568 /* This is the algorithm from ufs in spfs */ 569 static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp) 570 { 571 size_t size; 572 573 memset(&qidp->path, 0, sizeof(qidp->path)); 574 size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 575 memcpy(&qidp->path, &stbuf->st_ino, size); 576 qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 577 qidp->type = 0; 578 if (S_ISDIR(stbuf->st_mode)) { 579 qidp->type |= P9_QID_TYPE_DIR; 580 } 581 if (S_ISLNK(stbuf->st_mode)) { 582 qidp->type |= P9_QID_TYPE_SYMLINK; 583 } 584 } 585 586 static int fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, V9fsQID *qidp) 587 { 588 struct stat stbuf; 589 int err; 590 591 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 592 if (err < 0) { 593 return err; 594 } 595 stat_to_qid(&stbuf, qidp); 596 return 0; 597 } 598 599 V9fsPDU *pdu_alloc(V9fsState *s) 600 { 601 V9fsPDU *pdu = NULL; 602 603 if (!QLIST_EMPTY(&s->free_list)) { 604 pdu = QLIST_FIRST(&s->free_list); 605 QLIST_REMOVE(pdu, next); 606 QLIST_INSERT_HEAD(&s->active_list, pdu, next); 607 } 608 return pdu; 609 } 610 611 void pdu_free(V9fsPDU *pdu) 612 { 613 if (pdu) { 614 V9fsState *s = pdu->s; 615 /* 616 * Cancelled pdu are added back to the freelist 617 * by flush request . 618 */ 619 if (!pdu->cancelled) { 620 QLIST_REMOVE(pdu, next); 621 QLIST_INSERT_HEAD(&s->free_list, pdu, next); 622 } 623 } 624 } 625 626 /* 627 * We don't do error checking for pdu_marshal/unmarshal here 628 * because we always expect to have enough space to encode 629 * error details 630 */ 631 static void pdu_complete(V9fsPDU *pdu, ssize_t len) 632 { 633 int8_t id = pdu->id + 1; /* Response */ 634 V9fsState *s = pdu->s; 635 636 if (len < 0) { 637 int err = -len; 638 len = 7; 639 640 if (s->proto_version != V9FS_PROTO_2000L) { 641 V9fsString str; 642 643 str.data = strerror(err); 644 str.size = strlen(str.data); 645 646 len += pdu_marshal(pdu, len, "s", &str); 647 id = P9_RERROR; 648 } 649 650 len += pdu_marshal(pdu, len, "d", err); 651 652 if (s->proto_version == V9FS_PROTO_2000L) { 653 id = P9_RLERROR; 654 } 655 trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 656 } 657 658 /* fill out the header */ 659 pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); 660 661 /* keep these in sync */ 662 pdu->size = len; 663 pdu->id = id; 664 665 pdu_push_and_notify(pdu); 666 667 /* Now wakeup anybody waiting in flush for this request */ 668 qemu_co_queue_next(&pdu->complete); 669 670 pdu_free(pdu); 671 } 672 673 static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 674 { 675 mode_t ret; 676 677 ret = mode & 0777; 678 if (mode & P9_STAT_MODE_DIR) { 679 ret |= S_IFDIR; 680 } 681 682 if (mode & P9_STAT_MODE_SYMLINK) { 683 ret |= S_IFLNK; 684 } 685 if (mode & P9_STAT_MODE_SOCKET) { 686 ret |= S_IFSOCK; 687 } 688 if (mode & P9_STAT_MODE_NAMED_PIPE) { 689 ret |= S_IFIFO; 690 } 691 if (mode & P9_STAT_MODE_DEVICE) { 692 if (extension->size && extension->data[0] == 'c') { 693 ret |= S_IFCHR; 694 } else { 695 ret |= S_IFBLK; 696 } 697 } 698 699 if (!(ret&~0777)) { 700 ret |= S_IFREG; 701 } 702 703 if (mode & P9_STAT_MODE_SETUID) { 704 ret |= S_ISUID; 705 } 706 if (mode & P9_STAT_MODE_SETGID) { 707 ret |= S_ISGID; 708 } 709 if (mode & P9_STAT_MODE_SETVTX) { 710 ret |= S_ISVTX; 711 } 712 713 return ret; 714 } 715 716 static int donttouch_stat(V9fsStat *stat) 717 { 718 if (stat->type == -1 && 719 stat->dev == -1 && 720 stat->qid.type == -1 && 721 stat->qid.version == -1 && 722 stat->qid.path == -1 && 723 stat->mode == -1 && 724 stat->atime == -1 && 725 stat->mtime == -1 && 726 stat->length == -1 && 727 !stat->name.size && 728 !stat->uid.size && 729 !stat->gid.size && 730 !stat->muid.size && 731 stat->n_uid == -1 && 732 stat->n_gid == -1 && 733 stat->n_muid == -1) { 734 return 1; 735 } 736 737 return 0; 738 } 739 740 static void v9fs_stat_init(V9fsStat *stat) 741 { 742 v9fs_string_init(&stat->name); 743 v9fs_string_init(&stat->uid); 744 v9fs_string_init(&stat->gid); 745 v9fs_string_init(&stat->muid); 746 v9fs_string_init(&stat->extension); 747 } 748 749 static void v9fs_stat_free(V9fsStat *stat) 750 { 751 v9fs_string_free(&stat->name); 752 v9fs_string_free(&stat->uid); 753 v9fs_string_free(&stat->gid); 754 v9fs_string_free(&stat->muid); 755 v9fs_string_free(&stat->extension); 756 } 757 758 static uint32_t stat_to_v9mode(const struct stat *stbuf) 759 { 760 uint32_t mode; 761 762 mode = stbuf->st_mode & 0777; 763 if (S_ISDIR(stbuf->st_mode)) { 764 mode |= P9_STAT_MODE_DIR; 765 } 766 767 if (S_ISLNK(stbuf->st_mode)) { 768 mode |= P9_STAT_MODE_SYMLINK; 769 } 770 771 if (S_ISSOCK(stbuf->st_mode)) { 772 mode |= P9_STAT_MODE_SOCKET; 773 } 774 775 if (S_ISFIFO(stbuf->st_mode)) { 776 mode |= P9_STAT_MODE_NAMED_PIPE; 777 } 778 779 if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 780 mode |= P9_STAT_MODE_DEVICE; 781 } 782 783 if (stbuf->st_mode & S_ISUID) { 784 mode |= P9_STAT_MODE_SETUID; 785 } 786 787 if (stbuf->st_mode & S_ISGID) { 788 mode |= P9_STAT_MODE_SETGID; 789 } 790 791 if (stbuf->st_mode & S_ISVTX) { 792 mode |= P9_STAT_MODE_SETVTX; 793 } 794 795 return mode; 796 } 797 798 static int stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name, 799 const struct stat *stbuf, 800 V9fsStat *v9stat) 801 { 802 int err; 803 const char *str; 804 805 memset(v9stat, 0, sizeof(*v9stat)); 806 807 stat_to_qid(stbuf, &v9stat->qid); 808 v9stat->mode = stat_to_v9mode(stbuf); 809 v9stat->atime = stbuf->st_atime; 810 v9stat->mtime = stbuf->st_mtime; 811 v9stat->length = stbuf->st_size; 812 813 v9fs_string_null(&v9stat->uid); 814 v9fs_string_null(&v9stat->gid); 815 v9fs_string_null(&v9stat->muid); 816 817 v9stat->n_uid = stbuf->st_uid; 818 v9stat->n_gid = stbuf->st_gid; 819 v9stat->n_muid = 0; 820 821 v9fs_string_null(&v9stat->extension); 822 823 if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 824 err = v9fs_co_readlink(pdu, name, &v9stat->extension); 825 if (err < 0) { 826 return err; 827 } 828 } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 829 v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 830 S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 831 major(stbuf->st_rdev), minor(stbuf->st_rdev)); 832 } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 833 v9fs_string_sprintf(&v9stat->extension, "%s %lu", 834 "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 835 } 836 837 str = strrchr(name->data, '/'); 838 if (str) { 839 str += 1; 840 } else { 841 str = name->data; 842 } 843 844 v9fs_string_sprintf(&v9stat->name, "%s", str); 845 846 v9stat->size = 61 + 847 v9fs_string_size(&v9stat->name) + 848 v9fs_string_size(&v9stat->uid) + 849 v9fs_string_size(&v9stat->gid) + 850 v9fs_string_size(&v9stat->muid) + 851 v9fs_string_size(&v9stat->extension); 852 return 0; 853 } 854 855 #define P9_STATS_MODE 0x00000001ULL 856 #define P9_STATS_NLINK 0x00000002ULL 857 #define P9_STATS_UID 0x00000004ULL 858 #define P9_STATS_GID 0x00000008ULL 859 #define P9_STATS_RDEV 0x00000010ULL 860 #define P9_STATS_ATIME 0x00000020ULL 861 #define P9_STATS_MTIME 0x00000040ULL 862 #define P9_STATS_CTIME 0x00000080ULL 863 #define P9_STATS_INO 0x00000100ULL 864 #define P9_STATS_SIZE 0x00000200ULL 865 #define P9_STATS_BLOCKS 0x00000400ULL 866 867 #define P9_STATS_BTIME 0x00000800ULL 868 #define P9_STATS_GEN 0x00001000ULL 869 #define P9_STATS_DATA_VERSION 0x00002000ULL 870 871 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 872 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 873 874 875 static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf, 876 V9fsStatDotl *v9lstat) 877 { 878 memset(v9lstat, 0, sizeof(*v9lstat)); 879 880 v9lstat->st_mode = stbuf->st_mode; 881 v9lstat->st_nlink = stbuf->st_nlink; 882 v9lstat->st_uid = stbuf->st_uid; 883 v9lstat->st_gid = stbuf->st_gid; 884 v9lstat->st_rdev = stbuf->st_rdev; 885 v9lstat->st_size = stbuf->st_size; 886 v9lstat->st_blksize = stbuf->st_blksize; 887 v9lstat->st_blocks = stbuf->st_blocks; 888 v9lstat->st_atime_sec = stbuf->st_atime; 889 v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 890 v9lstat->st_mtime_sec = stbuf->st_mtime; 891 v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 892 v9lstat->st_ctime_sec = stbuf->st_ctime; 893 v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 894 /* Currently we only support BASIC fields in stat */ 895 v9lstat->st_result_mask = P9_STATS_BASIC; 896 897 stat_to_qid(stbuf, &v9lstat->qid); 898 } 899 900 static void print_sg(struct iovec *sg, int cnt) 901 { 902 int i; 903 904 printf("sg[%d]: {", cnt); 905 for (i = 0; i < cnt; i++) { 906 if (i) { 907 printf(", "); 908 } 909 printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 910 } 911 printf("}\n"); 912 } 913 914 /* Will call this only for path name based fid */ 915 static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 916 { 917 V9fsPath str; 918 v9fs_path_init(&str); 919 v9fs_path_copy(&str, dst); 920 v9fs_string_sprintf((V9fsString *)dst, "%s%s", src->data, str.data+len); 921 v9fs_path_free(&str); 922 /* +1 to include terminating NULL */ 923 dst->size++; 924 } 925 926 static inline bool is_ro_export(FsContext *ctx) 927 { 928 return ctx->export_flags & V9FS_RDONLY; 929 } 930 931 static void v9fs_version(void *opaque) 932 { 933 ssize_t err; 934 V9fsPDU *pdu = opaque; 935 V9fsState *s = pdu->s; 936 V9fsString version; 937 size_t offset = 7; 938 939 v9fs_string_init(&version); 940 err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 941 if (err < 0) { 942 offset = err; 943 goto out; 944 } 945 trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 946 947 virtfs_reset(pdu); 948 949 if (!strcmp(version.data, "9P2000.u")) { 950 s->proto_version = V9FS_PROTO_2000U; 951 } else if (!strcmp(version.data, "9P2000.L")) { 952 s->proto_version = V9FS_PROTO_2000L; 953 } else { 954 v9fs_string_sprintf(&version, "unknown"); 955 } 956 957 err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 958 if (err < 0) { 959 offset = err; 960 goto out; 961 } 962 offset += err; 963 trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 964 out: 965 pdu_complete(pdu, offset); 966 v9fs_string_free(&version); 967 } 968 969 static void v9fs_attach(void *opaque) 970 { 971 V9fsPDU *pdu = opaque; 972 V9fsState *s = pdu->s; 973 int32_t fid, afid, n_uname; 974 V9fsString uname, aname; 975 V9fsFidState *fidp; 976 size_t offset = 7; 977 V9fsQID qid; 978 ssize_t err; 979 980 v9fs_string_init(&uname); 981 v9fs_string_init(&aname); 982 err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 983 &afid, &uname, &aname, &n_uname); 984 if (err < 0) { 985 goto out_nofid; 986 } 987 trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 988 989 fidp = alloc_fid(s, fid); 990 if (fidp == NULL) { 991 err = -EINVAL; 992 goto out_nofid; 993 } 994 fidp->uid = n_uname; 995 err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 996 if (err < 0) { 997 err = -EINVAL; 998 clunk_fid(s, fid); 999 goto out; 1000 } 1001 err = fid_to_qid(pdu, fidp, &qid); 1002 if (err < 0) { 1003 err = -EINVAL; 1004 clunk_fid(s, fid); 1005 goto out; 1006 } 1007 err = pdu_marshal(pdu, offset, "Q", &qid); 1008 if (err < 0) { 1009 clunk_fid(s, fid); 1010 goto out; 1011 } 1012 err += offset; 1013 memcpy(&s->root_qid, &qid, sizeof(qid)); 1014 trace_v9fs_attach_return(pdu->tag, pdu->id, 1015 qid.type, qid.version, qid.path); 1016 /* 1017 * disable migration if we haven't done already. 1018 * attach could get called multiple times for the same export. 1019 */ 1020 if (!s->migration_blocker) { 1021 s->root_fid = fid; 1022 error_setg(&s->migration_blocker, 1023 "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1024 s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 1025 migrate_add_blocker(s->migration_blocker); 1026 } 1027 out: 1028 put_fid(pdu, fidp); 1029 out_nofid: 1030 pdu_complete(pdu, err); 1031 v9fs_string_free(&uname); 1032 v9fs_string_free(&aname); 1033 } 1034 1035 static void v9fs_stat(void *opaque) 1036 { 1037 int32_t fid; 1038 V9fsStat v9stat; 1039 ssize_t err = 0; 1040 size_t offset = 7; 1041 struct stat stbuf; 1042 V9fsFidState *fidp; 1043 V9fsPDU *pdu = opaque; 1044 1045 err = pdu_unmarshal(pdu, offset, "d", &fid); 1046 if (err < 0) { 1047 goto out_nofid; 1048 } 1049 trace_v9fs_stat(pdu->tag, pdu->id, fid); 1050 1051 fidp = get_fid(pdu, fid); 1052 if (fidp == NULL) { 1053 err = -ENOENT; 1054 goto out_nofid; 1055 } 1056 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 1057 if (err < 0) { 1058 goto out; 1059 } 1060 err = stat_to_v9stat(pdu, &fidp->path, &stbuf, &v9stat); 1061 if (err < 0) { 1062 goto out; 1063 } 1064 err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 1065 if (err < 0) { 1066 v9fs_stat_free(&v9stat); 1067 goto out; 1068 } 1069 trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 1070 v9stat.atime, v9stat.mtime, v9stat.length); 1071 err += offset; 1072 v9fs_stat_free(&v9stat); 1073 out: 1074 put_fid(pdu, fidp); 1075 out_nofid: 1076 pdu_complete(pdu, err); 1077 } 1078 1079 static void v9fs_getattr(void *opaque) 1080 { 1081 int32_t fid; 1082 size_t offset = 7; 1083 ssize_t retval = 0; 1084 struct stat stbuf; 1085 V9fsFidState *fidp; 1086 uint64_t request_mask; 1087 V9fsStatDotl v9stat_dotl; 1088 V9fsPDU *pdu = opaque; 1089 V9fsState *s = pdu->s; 1090 1091 retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 1092 if (retval < 0) { 1093 goto out_nofid; 1094 } 1095 trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 1096 1097 fidp = get_fid(pdu, fid); 1098 if (fidp == NULL) { 1099 retval = -ENOENT; 1100 goto out_nofid; 1101 } 1102 /* 1103 * Currently we only support BASIC fields in stat, so there is no 1104 * need to look at request_mask. 1105 */ 1106 retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 1107 if (retval < 0) { 1108 goto out; 1109 } 1110 stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl); 1111 1112 /* fill st_gen if requested and supported by underlying fs */ 1113 if (request_mask & P9_STATS_GEN) { 1114 retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 1115 switch (retval) { 1116 case 0: 1117 /* we have valid st_gen: update result mask */ 1118 v9stat_dotl.st_result_mask |= P9_STATS_GEN; 1119 break; 1120 case -EINTR: 1121 /* request cancelled, e.g. by Tflush */ 1122 goto out; 1123 default: 1124 /* failed to get st_gen: not fatal, ignore */ 1125 break; 1126 } 1127 } 1128 retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 1129 if (retval < 0) { 1130 goto out; 1131 } 1132 retval += offset; 1133 trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 1134 v9stat_dotl.st_mode, v9stat_dotl.st_uid, 1135 v9stat_dotl.st_gid); 1136 out: 1137 put_fid(pdu, fidp); 1138 out_nofid: 1139 pdu_complete(pdu, retval); 1140 } 1141 1142 /* Attribute flags */ 1143 #define P9_ATTR_MODE (1 << 0) 1144 #define P9_ATTR_UID (1 << 1) 1145 #define P9_ATTR_GID (1 << 2) 1146 #define P9_ATTR_SIZE (1 << 3) 1147 #define P9_ATTR_ATIME (1 << 4) 1148 #define P9_ATTR_MTIME (1 << 5) 1149 #define P9_ATTR_CTIME (1 << 6) 1150 #define P9_ATTR_ATIME_SET (1 << 7) 1151 #define P9_ATTR_MTIME_SET (1 << 8) 1152 1153 #define P9_ATTR_MASK 127 1154 1155 static void v9fs_setattr(void *opaque) 1156 { 1157 int err = 0; 1158 int32_t fid; 1159 V9fsFidState *fidp; 1160 size_t offset = 7; 1161 V9fsIattr v9iattr; 1162 V9fsPDU *pdu = opaque; 1163 1164 err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 1165 if (err < 0) { 1166 goto out_nofid; 1167 } 1168 1169 fidp = get_fid(pdu, fid); 1170 if (fidp == NULL) { 1171 err = -EINVAL; 1172 goto out_nofid; 1173 } 1174 if (v9iattr.valid & P9_ATTR_MODE) { 1175 err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 1176 if (err < 0) { 1177 goto out; 1178 } 1179 } 1180 if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 1181 struct timespec times[2]; 1182 if (v9iattr.valid & P9_ATTR_ATIME) { 1183 if (v9iattr.valid & P9_ATTR_ATIME_SET) { 1184 times[0].tv_sec = v9iattr.atime_sec; 1185 times[0].tv_nsec = v9iattr.atime_nsec; 1186 } else { 1187 times[0].tv_nsec = UTIME_NOW; 1188 } 1189 } else { 1190 times[0].tv_nsec = UTIME_OMIT; 1191 } 1192 if (v9iattr.valid & P9_ATTR_MTIME) { 1193 if (v9iattr.valid & P9_ATTR_MTIME_SET) { 1194 times[1].tv_sec = v9iattr.mtime_sec; 1195 times[1].tv_nsec = v9iattr.mtime_nsec; 1196 } else { 1197 times[1].tv_nsec = UTIME_NOW; 1198 } 1199 } else { 1200 times[1].tv_nsec = UTIME_OMIT; 1201 } 1202 err = v9fs_co_utimensat(pdu, &fidp->path, times); 1203 if (err < 0) { 1204 goto out; 1205 } 1206 } 1207 /* 1208 * If the only valid entry in iattr is ctime we can call 1209 * chown(-1,-1) to update the ctime of the file 1210 */ 1211 if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 1212 ((v9iattr.valid & P9_ATTR_CTIME) 1213 && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 1214 if (!(v9iattr.valid & P9_ATTR_UID)) { 1215 v9iattr.uid = -1; 1216 } 1217 if (!(v9iattr.valid & P9_ATTR_GID)) { 1218 v9iattr.gid = -1; 1219 } 1220 err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 1221 v9iattr.gid); 1222 if (err < 0) { 1223 goto out; 1224 } 1225 } 1226 if (v9iattr.valid & (P9_ATTR_SIZE)) { 1227 err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 1228 if (err < 0) { 1229 goto out; 1230 } 1231 } 1232 err = offset; 1233 out: 1234 put_fid(pdu, fidp); 1235 out_nofid: 1236 pdu_complete(pdu, err); 1237 } 1238 1239 static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 1240 { 1241 int i; 1242 ssize_t err; 1243 size_t offset = 7; 1244 1245 err = pdu_marshal(pdu, offset, "w", nwnames); 1246 if (err < 0) { 1247 return err; 1248 } 1249 offset += err; 1250 for (i = 0; i < nwnames; i++) { 1251 err = pdu_marshal(pdu, offset, "Q", &qids[i]); 1252 if (err < 0) { 1253 return err; 1254 } 1255 offset += err; 1256 } 1257 return offset; 1258 } 1259 1260 static bool name_is_illegal(const char *name) 1261 { 1262 return !*name || strchr(name, '/') != NULL; 1263 } 1264 1265 static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2) 1266 { 1267 return 1268 qid1->type != qid2->type || 1269 qid1->version != qid2->version || 1270 qid1->path != qid2->path; 1271 } 1272 1273 static void v9fs_walk(void *opaque) 1274 { 1275 int name_idx; 1276 V9fsQID *qids = NULL; 1277 int i, err = 0; 1278 V9fsPath dpath, path; 1279 uint16_t nwnames; 1280 struct stat stbuf; 1281 size_t offset = 7; 1282 int32_t fid, newfid; 1283 V9fsString *wnames = NULL; 1284 V9fsFidState *fidp; 1285 V9fsFidState *newfidp = NULL; 1286 V9fsPDU *pdu = opaque; 1287 V9fsState *s = pdu->s; 1288 V9fsQID qid; 1289 1290 err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 1291 if (err < 0) { 1292 pdu_complete(pdu, err); 1293 return ; 1294 } 1295 offset += err; 1296 1297 trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 1298 1299 if (nwnames && nwnames <= P9_MAXWELEM) { 1300 wnames = g_malloc0(sizeof(wnames[0]) * nwnames); 1301 qids = g_malloc0(sizeof(qids[0]) * nwnames); 1302 for (i = 0; i < nwnames; i++) { 1303 err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 1304 if (err < 0) { 1305 goto out_nofid; 1306 } 1307 if (name_is_illegal(wnames[i].data)) { 1308 err = -ENOENT; 1309 goto out_nofid; 1310 } 1311 offset += err; 1312 } 1313 } else if (nwnames > P9_MAXWELEM) { 1314 err = -EINVAL; 1315 goto out_nofid; 1316 } 1317 fidp = get_fid(pdu, fid); 1318 if (fidp == NULL) { 1319 err = -ENOENT; 1320 goto out_nofid; 1321 } 1322 1323 err = fid_to_qid(pdu, fidp, &qid); 1324 if (err < 0) { 1325 goto out; 1326 } 1327 1328 v9fs_path_init(&dpath); 1329 v9fs_path_init(&path); 1330 /* 1331 * Both dpath and path initially poin to fidp. 1332 * Needed to handle request with nwnames == 0 1333 */ 1334 v9fs_path_copy(&dpath, &fidp->path); 1335 v9fs_path_copy(&path, &fidp->path); 1336 for (name_idx = 0; name_idx < nwnames; name_idx++) { 1337 if (not_same_qid(&pdu->s->root_qid, &qid) || 1338 strcmp("..", wnames[name_idx].data)) { 1339 err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, 1340 &path); 1341 if (err < 0) { 1342 goto out; 1343 } 1344 1345 err = v9fs_co_lstat(pdu, &path, &stbuf); 1346 if (err < 0) { 1347 goto out; 1348 } 1349 stat_to_qid(&stbuf, &qid); 1350 v9fs_path_copy(&dpath, &path); 1351 } 1352 memcpy(&qids[name_idx], &qid, sizeof(qid)); 1353 } 1354 if (fid == newfid) { 1355 BUG_ON(fidp->fid_type != P9_FID_NONE); 1356 v9fs_path_copy(&fidp->path, &path); 1357 } else { 1358 newfidp = alloc_fid(s, newfid); 1359 if (newfidp == NULL) { 1360 err = -EINVAL; 1361 goto out; 1362 } 1363 newfidp->uid = fidp->uid; 1364 v9fs_path_copy(&newfidp->path, &path); 1365 } 1366 err = v9fs_walk_marshal(pdu, nwnames, qids); 1367 trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 1368 out: 1369 put_fid(pdu, fidp); 1370 if (newfidp) { 1371 put_fid(pdu, newfidp); 1372 } 1373 v9fs_path_free(&dpath); 1374 v9fs_path_free(&path); 1375 out_nofid: 1376 pdu_complete(pdu, err); 1377 if (nwnames && nwnames <= P9_MAXWELEM) { 1378 for (name_idx = 0; name_idx < nwnames; name_idx++) { 1379 v9fs_string_free(&wnames[name_idx]); 1380 } 1381 g_free(wnames); 1382 g_free(qids); 1383 } 1384 } 1385 1386 static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path) 1387 { 1388 struct statfs stbuf; 1389 int32_t iounit = 0; 1390 V9fsState *s = pdu->s; 1391 1392 /* 1393 * iounit should be multiples of f_bsize (host filesystem block size 1394 * and as well as less than (client msize - P9_IOHDRSZ)) 1395 */ 1396 if (!v9fs_co_statfs(pdu, path, &stbuf)) { 1397 iounit = stbuf.f_bsize; 1398 iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize; 1399 } 1400 if (!iounit) { 1401 iounit = s->msize - P9_IOHDRSZ; 1402 } 1403 return iounit; 1404 } 1405 1406 static void v9fs_open(void *opaque) 1407 { 1408 int flags; 1409 int32_t fid; 1410 int32_t mode; 1411 V9fsQID qid; 1412 int iounit = 0; 1413 ssize_t err = 0; 1414 size_t offset = 7; 1415 struct stat stbuf; 1416 V9fsFidState *fidp; 1417 V9fsPDU *pdu = opaque; 1418 V9fsState *s = pdu->s; 1419 1420 if (s->proto_version == V9FS_PROTO_2000L) { 1421 err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 1422 } else { 1423 uint8_t modebyte; 1424 err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 1425 mode = modebyte; 1426 } 1427 if (err < 0) { 1428 goto out_nofid; 1429 } 1430 trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 1431 1432 fidp = get_fid(pdu, fid); 1433 if (fidp == NULL) { 1434 err = -ENOENT; 1435 goto out_nofid; 1436 } 1437 BUG_ON(fidp->fid_type != P9_FID_NONE); 1438 1439 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 1440 if (err < 0) { 1441 goto out; 1442 } 1443 stat_to_qid(&stbuf, &qid); 1444 if (S_ISDIR(stbuf.st_mode)) { 1445 err = v9fs_co_opendir(pdu, fidp); 1446 if (err < 0) { 1447 goto out; 1448 } 1449 fidp->fid_type = P9_FID_DIR; 1450 err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 1451 if (err < 0) { 1452 goto out; 1453 } 1454 err += offset; 1455 } else { 1456 if (s->proto_version == V9FS_PROTO_2000L) { 1457 flags = get_dotl_openflags(s, mode); 1458 } else { 1459 flags = omode_to_uflags(mode); 1460 } 1461 if (is_ro_export(&s->ctx)) { 1462 if (mode & O_WRONLY || mode & O_RDWR || 1463 mode & O_APPEND || mode & O_TRUNC) { 1464 err = -EROFS; 1465 goto out; 1466 } 1467 } 1468 err = v9fs_co_open(pdu, fidp, flags); 1469 if (err < 0) { 1470 goto out; 1471 } 1472 fidp->fid_type = P9_FID_FILE; 1473 fidp->open_flags = flags; 1474 if (flags & O_EXCL) { 1475 /* 1476 * We let the host file system do O_EXCL check 1477 * We should not reclaim such fd 1478 */ 1479 fidp->flags |= FID_NON_RECLAIMABLE; 1480 } 1481 iounit = get_iounit(pdu, &fidp->path); 1482 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 1483 if (err < 0) { 1484 goto out; 1485 } 1486 err += offset; 1487 } 1488 trace_v9fs_open_return(pdu->tag, pdu->id, 1489 qid.type, qid.version, qid.path, iounit); 1490 out: 1491 put_fid(pdu, fidp); 1492 out_nofid: 1493 pdu_complete(pdu, err); 1494 } 1495 1496 static void v9fs_lcreate(void *opaque) 1497 { 1498 int32_t dfid, flags, mode; 1499 gid_t gid; 1500 ssize_t err = 0; 1501 ssize_t offset = 7; 1502 V9fsString name; 1503 V9fsFidState *fidp; 1504 struct stat stbuf; 1505 V9fsQID qid; 1506 int32_t iounit; 1507 V9fsPDU *pdu = opaque; 1508 1509 v9fs_string_init(&name); 1510 err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 1511 &name, &flags, &mode, &gid); 1512 if (err < 0) { 1513 goto out_nofid; 1514 } 1515 trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 1516 1517 if (name_is_illegal(name.data)) { 1518 err = -ENOENT; 1519 goto out_nofid; 1520 } 1521 1522 if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 1523 err = -EEXIST; 1524 goto out_nofid; 1525 } 1526 1527 fidp = get_fid(pdu, dfid); 1528 if (fidp == NULL) { 1529 err = -ENOENT; 1530 goto out_nofid; 1531 } 1532 1533 flags = get_dotl_openflags(pdu->s, flags); 1534 err = v9fs_co_open2(pdu, fidp, &name, gid, 1535 flags | O_CREAT, mode, &stbuf); 1536 if (err < 0) { 1537 goto out; 1538 } 1539 fidp->fid_type = P9_FID_FILE; 1540 fidp->open_flags = flags; 1541 if (flags & O_EXCL) { 1542 /* 1543 * We let the host file system do O_EXCL check 1544 * We should not reclaim such fd 1545 */ 1546 fidp->flags |= FID_NON_RECLAIMABLE; 1547 } 1548 iounit = get_iounit(pdu, &fidp->path); 1549 stat_to_qid(&stbuf, &qid); 1550 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 1551 if (err < 0) { 1552 goto out; 1553 } 1554 err += offset; 1555 trace_v9fs_lcreate_return(pdu->tag, pdu->id, 1556 qid.type, qid.version, qid.path, iounit); 1557 out: 1558 put_fid(pdu, fidp); 1559 out_nofid: 1560 pdu_complete(pdu, err); 1561 v9fs_string_free(&name); 1562 } 1563 1564 static void v9fs_fsync(void *opaque) 1565 { 1566 int err; 1567 int32_t fid; 1568 int datasync; 1569 size_t offset = 7; 1570 V9fsFidState *fidp; 1571 V9fsPDU *pdu = opaque; 1572 1573 err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 1574 if (err < 0) { 1575 goto out_nofid; 1576 } 1577 trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 1578 1579 fidp = get_fid(pdu, fid); 1580 if (fidp == NULL) { 1581 err = -ENOENT; 1582 goto out_nofid; 1583 } 1584 err = v9fs_co_fsync(pdu, fidp, datasync); 1585 if (!err) { 1586 err = offset; 1587 } 1588 put_fid(pdu, fidp); 1589 out_nofid: 1590 pdu_complete(pdu, err); 1591 } 1592 1593 static void v9fs_clunk(void *opaque) 1594 { 1595 int err; 1596 int32_t fid; 1597 size_t offset = 7; 1598 V9fsFidState *fidp; 1599 V9fsPDU *pdu = opaque; 1600 V9fsState *s = pdu->s; 1601 1602 err = pdu_unmarshal(pdu, offset, "d", &fid); 1603 if (err < 0) { 1604 goto out_nofid; 1605 } 1606 trace_v9fs_clunk(pdu->tag, pdu->id, fid); 1607 1608 fidp = clunk_fid(s, fid); 1609 if (fidp == NULL) { 1610 err = -ENOENT; 1611 goto out_nofid; 1612 } 1613 /* 1614 * Bump the ref so that put_fid will 1615 * free the fid. 1616 */ 1617 fidp->ref++; 1618 err = put_fid(pdu, fidp); 1619 if (!err) { 1620 err = offset; 1621 } 1622 out_nofid: 1623 pdu_complete(pdu, err); 1624 } 1625 1626 static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 1627 uint64_t off, uint32_t max_count) 1628 { 1629 ssize_t err; 1630 size_t offset = 7; 1631 int read_count; 1632 int64_t xattr_len; 1633 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); 1634 VirtQueueElement *elem = v->elems[pdu->idx]; 1635 1636 xattr_len = fidp->fs.xattr.len; 1637 read_count = xattr_len - off; 1638 if (read_count > max_count) { 1639 read_count = max_count; 1640 } else if (read_count < 0) { 1641 /* 1642 * read beyond XATTR value 1643 */ 1644 read_count = 0; 1645 } 1646 err = pdu_marshal(pdu, offset, "d", read_count); 1647 if (err < 0) { 1648 return err; 1649 } 1650 offset += err; 1651 1652 err = v9fs_pack(elem->in_sg, elem->in_num, offset, 1653 ((char *)fidp->fs.xattr.value) + off, 1654 read_count); 1655 if (err < 0) { 1656 return err; 1657 } 1658 offset += err; 1659 return offset; 1660 } 1661 1662 static int v9fs_do_readdir_with_stat(V9fsPDU *pdu, 1663 V9fsFidState *fidp, uint32_t max_count) 1664 { 1665 V9fsPath path; 1666 V9fsStat v9stat; 1667 int len, err = 0; 1668 int32_t count = 0; 1669 struct stat stbuf; 1670 off_t saved_dir_pos; 1671 struct dirent *dent; 1672 1673 /* save the directory position */ 1674 saved_dir_pos = v9fs_co_telldir(pdu, fidp); 1675 if (saved_dir_pos < 0) { 1676 return saved_dir_pos; 1677 } 1678 1679 while (1) { 1680 v9fs_path_init(&path); 1681 1682 v9fs_readdir_lock(&fidp->fs.dir); 1683 1684 err = v9fs_co_readdir(pdu, fidp, &dent); 1685 if (err || !dent) { 1686 break; 1687 } 1688 err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 1689 if (err < 0) { 1690 break; 1691 } 1692 err = v9fs_co_lstat(pdu, &path, &stbuf); 1693 if (err < 0) { 1694 break; 1695 } 1696 err = stat_to_v9stat(pdu, &path, &stbuf, &v9stat); 1697 if (err < 0) { 1698 break; 1699 } 1700 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 1701 len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 1702 1703 v9fs_readdir_unlock(&fidp->fs.dir); 1704 1705 if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) { 1706 /* Ran out of buffer. Set dir back to old position and return */ 1707 v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 1708 v9fs_stat_free(&v9stat); 1709 v9fs_path_free(&path); 1710 return count; 1711 } 1712 count += len; 1713 v9fs_stat_free(&v9stat); 1714 v9fs_path_free(&path); 1715 saved_dir_pos = dent->d_off; 1716 } 1717 1718 v9fs_readdir_unlock(&fidp->fs.dir); 1719 1720 v9fs_path_free(&path); 1721 if (err < 0) { 1722 return err; 1723 } 1724 return count; 1725 } 1726 1727 /* 1728 * Create a QEMUIOVector for a sub-region of PDU iovecs 1729 * 1730 * @qiov: uninitialized QEMUIOVector 1731 * @skip: number of bytes to skip from beginning of PDU 1732 * @size: number of bytes to include 1733 * @is_write: true - write, false - read 1734 * 1735 * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 1736 * with qemu_iovec_destroy(). 1737 */ 1738 static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 1739 size_t skip, size_t size, 1740 bool is_write) 1741 { 1742 QEMUIOVector elem; 1743 struct iovec *iov; 1744 unsigned int niov; 1745 1746 virtio_init_iov_from_pdu(pdu, &iov, &niov, is_write); 1747 1748 qemu_iovec_init_external(&elem, iov, niov); 1749 qemu_iovec_init(qiov, niov); 1750 qemu_iovec_concat(qiov, &elem, skip, size); 1751 } 1752 1753 static void v9fs_read(void *opaque) 1754 { 1755 int32_t fid; 1756 uint64_t off; 1757 ssize_t err = 0; 1758 int32_t count = 0; 1759 size_t offset = 7; 1760 uint32_t max_count; 1761 V9fsFidState *fidp; 1762 V9fsPDU *pdu = opaque; 1763 V9fsState *s = pdu->s; 1764 1765 err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 1766 if (err < 0) { 1767 goto out_nofid; 1768 } 1769 trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 1770 1771 fidp = get_fid(pdu, fid); 1772 if (fidp == NULL) { 1773 err = -EINVAL; 1774 goto out_nofid; 1775 } 1776 if (fidp->fid_type == P9_FID_DIR) { 1777 1778 if (off == 0) { 1779 v9fs_co_rewinddir(pdu, fidp); 1780 } 1781 count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 1782 if (count < 0) { 1783 err = count; 1784 goto out; 1785 } 1786 err = pdu_marshal(pdu, offset, "d", count); 1787 if (err < 0) { 1788 goto out; 1789 } 1790 err += offset + count; 1791 } else if (fidp->fid_type == P9_FID_FILE) { 1792 QEMUIOVector qiov_full; 1793 QEMUIOVector qiov; 1794 int32_t len; 1795 1796 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 1797 qemu_iovec_init(&qiov, qiov_full.niov); 1798 do { 1799 qemu_iovec_reset(&qiov); 1800 qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 1801 if (0) { 1802 print_sg(qiov.iov, qiov.niov); 1803 } 1804 /* Loop in case of EINTR */ 1805 do { 1806 len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 1807 if (len >= 0) { 1808 off += len; 1809 count += len; 1810 } 1811 } while (len == -EINTR && !pdu->cancelled); 1812 if (len < 0) { 1813 /* IO error return the error */ 1814 err = len; 1815 goto out; 1816 } 1817 } while (count < max_count && len > 0); 1818 err = pdu_marshal(pdu, offset, "d", count); 1819 if (err < 0) { 1820 goto out; 1821 } 1822 err += offset + count; 1823 qemu_iovec_destroy(&qiov); 1824 qemu_iovec_destroy(&qiov_full); 1825 } else if (fidp->fid_type == P9_FID_XATTR) { 1826 err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 1827 } else { 1828 err = -EINVAL; 1829 } 1830 trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 1831 out: 1832 put_fid(pdu, fidp); 1833 out_nofid: 1834 pdu_complete(pdu, err); 1835 } 1836 1837 static size_t v9fs_readdir_data_size(V9fsString *name) 1838 { 1839 /* 1840 * Size of each dirent on the wire: size of qid (13) + size of offset (8) 1841 * size of type (1) + size of name.size (2) + strlen(name.data) 1842 */ 1843 return 24 + v9fs_string_size(name); 1844 } 1845 1846 static int v9fs_do_readdir(V9fsPDU *pdu, 1847 V9fsFidState *fidp, int32_t max_count) 1848 { 1849 size_t size; 1850 V9fsQID qid; 1851 V9fsString name; 1852 int len, err = 0; 1853 int32_t count = 0; 1854 off_t saved_dir_pos; 1855 struct dirent *dent; 1856 1857 /* save the directory position */ 1858 saved_dir_pos = v9fs_co_telldir(pdu, fidp); 1859 if (saved_dir_pos < 0) { 1860 return saved_dir_pos; 1861 } 1862 1863 while (1) { 1864 v9fs_readdir_lock(&fidp->fs.dir); 1865 1866 err = v9fs_co_readdir(pdu, fidp, &dent); 1867 if (err || !dent) { 1868 break; 1869 } 1870 v9fs_string_init(&name); 1871 v9fs_string_sprintf(&name, "%s", dent->d_name); 1872 if ((count + v9fs_readdir_data_size(&name)) > max_count) { 1873 v9fs_readdir_unlock(&fidp->fs.dir); 1874 1875 /* Ran out of buffer. Set dir back to old position and return */ 1876 v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 1877 v9fs_string_free(&name); 1878 return count; 1879 } 1880 /* 1881 * Fill up just the path field of qid because the client uses 1882 * only that. To fill the entire qid structure we will have 1883 * to stat each dirent found, which is expensive 1884 */ 1885 size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 1886 memcpy(&qid.path, &dent->d_ino, size); 1887 /* Fill the other fields with dummy values */ 1888 qid.type = 0; 1889 qid.version = 0; 1890 1891 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 1892 len = pdu_marshal(pdu, 11 + count, "Qqbs", 1893 &qid, dent->d_off, 1894 dent->d_type, &name); 1895 1896 v9fs_readdir_unlock(&fidp->fs.dir); 1897 1898 if (len < 0) { 1899 v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 1900 v9fs_string_free(&name); 1901 return len; 1902 } 1903 count += len; 1904 v9fs_string_free(&name); 1905 saved_dir_pos = dent->d_off; 1906 } 1907 1908 v9fs_readdir_unlock(&fidp->fs.dir); 1909 1910 if (err < 0) { 1911 return err; 1912 } 1913 return count; 1914 } 1915 1916 static void v9fs_readdir(void *opaque) 1917 { 1918 int32_t fid; 1919 V9fsFidState *fidp; 1920 ssize_t retval = 0; 1921 size_t offset = 7; 1922 uint64_t initial_offset; 1923 int32_t count; 1924 uint32_t max_count; 1925 V9fsPDU *pdu = opaque; 1926 1927 retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 1928 &initial_offset, &max_count); 1929 if (retval < 0) { 1930 goto out_nofid; 1931 } 1932 trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 1933 1934 fidp = get_fid(pdu, fid); 1935 if (fidp == NULL) { 1936 retval = -EINVAL; 1937 goto out_nofid; 1938 } 1939 if (!fidp->fs.dir.stream) { 1940 retval = -EINVAL; 1941 goto out; 1942 } 1943 if (initial_offset == 0) { 1944 v9fs_co_rewinddir(pdu, fidp); 1945 } else { 1946 v9fs_co_seekdir(pdu, fidp, initial_offset); 1947 } 1948 count = v9fs_do_readdir(pdu, fidp, max_count); 1949 if (count < 0) { 1950 retval = count; 1951 goto out; 1952 } 1953 retval = pdu_marshal(pdu, offset, "d", count); 1954 if (retval < 0) { 1955 goto out; 1956 } 1957 retval += count + offset; 1958 trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 1959 out: 1960 put_fid(pdu, fidp); 1961 out_nofid: 1962 pdu_complete(pdu, retval); 1963 } 1964 1965 static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 1966 uint64_t off, uint32_t count, 1967 struct iovec *sg, int cnt) 1968 { 1969 int i, to_copy; 1970 ssize_t err = 0; 1971 int write_count; 1972 int64_t xattr_len; 1973 size_t offset = 7; 1974 1975 1976 xattr_len = fidp->fs.xattr.len; 1977 write_count = xattr_len - off; 1978 if (write_count > count) { 1979 write_count = count; 1980 } else if (write_count < 0) { 1981 /* 1982 * write beyond XATTR value len specified in 1983 * xattrcreate 1984 */ 1985 err = -ENOSPC; 1986 goto out; 1987 } 1988 err = pdu_marshal(pdu, offset, "d", write_count); 1989 if (err < 0) { 1990 return err; 1991 } 1992 err += offset; 1993 fidp->fs.xattr.copied_len += write_count; 1994 /* 1995 * Now copy the content from sg list 1996 */ 1997 for (i = 0; i < cnt; i++) { 1998 if (write_count > sg[i].iov_len) { 1999 to_copy = sg[i].iov_len; 2000 } else { 2001 to_copy = write_count; 2002 } 2003 memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 2004 /* updating vs->off since we are not using below */ 2005 off += to_copy; 2006 write_count -= to_copy; 2007 } 2008 out: 2009 return err; 2010 } 2011 2012 static void v9fs_write(void *opaque) 2013 { 2014 ssize_t err; 2015 int32_t fid; 2016 uint64_t off; 2017 uint32_t count; 2018 int32_t len = 0; 2019 int32_t total = 0; 2020 size_t offset = 7; 2021 V9fsFidState *fidp; 2022 V9fsPDU *pdu = opaque; 2023 V9fsState *s = pdu->s; 2024 QEMUIOVector qiov_full; 2025 QEMUIOVector qiov; 2026 2027 err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 2028 if (err < 0) { 2029 pdu_complete(pdu, err); 2030 return; 2031 } 2032 offset += err; 2033 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 2034 trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 2035 2036 fidp = get_fid(pdu, fid); 2037 if (fidp == NULL) { 2038 err = -EINVAL; 2039 goto out_nofid; 2040 } 2041 if (fidp->fid_type == P9_FID_FILE) { 2042 if (fidp->fs.fd == -1) { 2043 err = -EINVAL; 2044 goto out; 2045 } 2046 } else if (fidp->fid_type == P9_FID_XATTR) { 2047 /* 2048 * setxattr operation 2049 */ 2050 err = v9fs_xattr_write(s, pdu, fidp, off, count, 2051 qiov_full.iov, qiov_full.niov); 2052 goto out; 2053 } else { 2054 err = -EINVAL; 2055 goto out; 2056 } 2057 qemu_iovec_init(&qiov, qiov_full.niov); 2058 do { 2059 qemu_iovec_reset(&qiov); 2060 qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 2061 if (0) { 2062 print_sg(qiov.iov, qiov.niov); 2063 } 2064 /* Loop in case of EINTR */ 2065 do { 2066 len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 2067 if (len >= 0) { 2068 off += len; 2069 total += len; 2070 } 2071 } while (len == -EINTR && !pdu->cancelled); 2072 if (len < 0) { 2073 /* IO error return the error */ 2074 err = len; 2075 goto out_qiov; 2076 } 2077 } while (total < count && len > 0); 2078 2079 offset = 7; 2080 err = pdu_marshal(pdu, offset, "d", total); 2081 if (err < 0) { 2082 goto out; 2083 } 2084 err += offset; 2085 trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 2086 out_qiov: 2087 qemu_iovec_destroy(&qiov); 2088 out: 2089 put_fid(pdu, fidp); 2090 out_nofid: 2091 qemu_iovec_destroy(&qiov_full); 2092 pdu_complete(pdu, err); 2093 } 2094 2095 static void v9fs_create(void *opaque) 2096 { 2097 int32_t fid; 2098 int err = 0; 2099 size_t offset = 7; 2100 V9fsFidState *fidp; 2101 V9fsQID qid; 2102 int32_t perm; 2103 int8_t mode; 2104 V9fsPath path; 2105 struct stat stbuf; 2106 V9fsString name; 2107 V9fsString extension; 2108 int iounit; 2109 V9fsPDU *pdu = opaque; 2110 2111 v9fs_path_init(&path); 2112 v9fs_string_init(&name); 2113 v9fs_string_init(&extension); 2114 err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 2115 &perm, &mode, &extension); 2116 if (err < 0) { 2117 goto out_nofid; 2118 } 2119 trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 2120 2121 if (name_is_illegal(name.data)) { 2122 err = -ENOENT; 2123 goto out_nofid; 2124 } 2125 2126 if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2127 err = -EEXIST; 2128 goto out_nofid; 2129 } 2130 2131 fidp = get_fid(pdu, fid); 2132 if (fidp == NULL) { 2133 err = -EINVAL; 2134 goto out_nofid; 2135 } 2136 if (perm & P9_STAT_MODE_DIR) { 2137 err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 2138 fidp->uid, -1, &stbuf); 2139 if (err < 0) { 2140 goto out; 2141 } 2142 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 2143 if (err < 0) { 2144 goto out; 2145 } 2146 v9fs_path_copy(&fidp->path, &path); 2147 err = v9fs_co_opendir(pdu, fidp); 2148 if (err < 0) { 2149 goto out; 2150 } 2151 fidp->fid_type = P9_FID_DIR; 2152 } else if (perm & P9_STAT_MODE_SYMLINK) { 2153 err = v9fs_co_symlink(pdu, fidp, &name, 2154 extension.data, -1 , &stbuf); 2155 if (err < 0) { 2156 goto out; 2157 } 2158 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 2159 if (err < 0) { 2160 goto out; 2161 } 2162 v9fs_path_copy(&fidp->path, &path); 2163 } else if (perm & P9_STAT_MODE_LINK) { 2164 int32_t ofid = atoi(extension.data); 2165 V9fsFidState *ofidp = get_fid(pdu, ofid); 2166 if (ofidp == NULL) { 2167 err = -EINVAL; 2168 goto out; 2169 } 2170 err = v9fs_co_link(pdu, ofidp, fidp, &name); 2171 put_fid(pdu, ofidp); 2172 if (err < 0) { 2173 goto out; 2174 } 2175 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 2176 if (err < 0) { 2177 fidp->fid_type = P9_FID_NONE; 2178 goto out; 2179 } 2180 v9fs_path_copy(&fidp->path, &path); 2181 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 2182 if (err < 0) { 2183 fidp->fid_type = P9_FID_NONE; 2184 goto out; 2185 } 2186 } else if (perm & P9_STAT_MODE_DEVICE) { 2187 char ctype; 2188 uint32_t major, minor; 2189 mode_t nmode = 0; 2190 2191 if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 2192 err = -errno; 2193 goto out; 2194 } 2195 2196 switch (ctype) { 2197 case 'c': 2198 nmode = S_IFCHR; 2199 break; 2200 case 'b': 2201 nmode = S_IFBLK; 2202 break; 2203 default: 2204 err = -EIO; 2205 goto out; 2206 } 2207 2208 nmode |= perm & 0777; 2209 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 2210 makedev(major, minor), nmode, &stbuf); 2211 if (err < 0) { 2212 goto out; 2213 } 2214 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 2215 if (err < 0) { 2216 goto out; 2217 } 2218 v9fs_path_copy(&fidp->path, &path); 2219 } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 2220 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 2221 0, S_IFIFO | (perm & 0777), &stbuf); 2222 if (err < 0) { 2223 goto out; 2224 } 2225 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 2226 if (err < 0) { 2227 goto out; 2228 } 2229 v9fs_path_copy(&fidp->path, &path); 2230 } else if (perm & P9_STAT_MODE_SOCKET) { 2231 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 2232 0, S_IFSOCK | (perm & 0777), &stbuf); 2233 if (err < 0) { 2234 goto out; 2235 } 2236 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 2237 if (err < 0) { 2238 goto out; 2239 } 2240 v9fs_path_copy(&fidp->path, &path); 2241 } else { 2242 err = v9fs_co_open2(pdu, fidp, &name, -1, 2243 omode_to_uflags(mode)|O_CREAT, perm, &stbuf); 2244 if (err < 0) { 2245 goto out; 2246 } 2247 fidp->fid_type = P9_FID_FILE; 2248 fidp->open_flags = omode_to_uflags(mode); 2249 if (fidp->open_flags & O_EXCL) { 2250 /* 2251 * We let the host file system do O_EXCL check 2252 * We should not reclaim such fd 2253 */ 2254 fidp->flags |= FID_NON_RECLAIMABLE; 2255 } 2256 } 2257 iounit = get_iounit(pdu, &fidp->path); 2258 stat_to_qid(&stbuf, &qid); 2259 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 2260 if (err < 0) { 2261 goto out; 2262 } 2263 err += offset; 2264 trace_v9fs_create_return(pdu->tag, pdu->id, 2265 qid.type, qid.version, qid.path, iounit); 2266 out: 2267 put_fid(pdu, fidp); 2268 out_nofid: 2269 pdu_complete(pdu, err); 2270 v9fs_string_free(&name); 2271 v9fs_string_free(&extension); 2272 v9fs_path_free(&path); 2273 } 2274 2275 static void v9fs_symlink(void *opaque) 2276 { 2277 V9fsPDU *pdu = opaque; 2278 V9fsString name; 2279 V9fsString symname; 2280 V9fsFidState *dfidp; 2281 V9fsQID qid; 2282 struct stat stbuf; 2283 int32_t dfid; 2284 int err = 0; 2285 gid_t gid; 2286 size_t offset = 7; 2287 2288 v9fs_string_init(&name); 2289 v9fs_string_init(&symname); 2290 err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 2291 if (err < 0) { 2292 goto out_nofid; 2293 } 2294 trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 2295 2296 if (name_is_illegal(name.data)) { 2297 err = -ENOENT; 2298 goto out_nofid; 2299 } 2300 2301 if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2302 err = -EEXIST; 2303 goto out_nofid; 2304 } 2305 2306 dfidp = get_fid(pdu, dfid); 2307 if (dfidp == NULL) { 2308 err = -EINVAL; 2309 goto out_nofid; 2310 } 2311 err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 2312 if (err < 0) { 2313 goto out; 2314 } 2315 stat_to_qid(&stbuf, &qid); 2316 err = pdu_marshal(pdu, offset, "Q", &qid); 2317 if (err < 0) { 2318 goto out; 2319 } 2320 err += offset; 2321 trace_v9fs_symlink_return(pdu->tag, pdu->id, 2322 qid.type, qid.version, qid.path); 2323 out: 2324 put_fid(pdu, dfidp); 2325 out_nofid: 2326 pdu_complete(pdu, err); 2327 v9fs_string_free(&name); 2328 v9fs_string_free(&symname); 2329 } 2330 2331 static void v9fs_flush(void *opaque) 2332 { 2333 ssize_t err; 2334 int16_t tag; 2335 size_t offset = 7; 2336 V9fsPDU *cancel_pdu; 2337 V9fsPDU *pdu = opaque; 2338 V9fsState *s = pdu->s; 2339 2340 err = pdu_unmarshal(pdu, offset, "w", &tag); 2341 if (err < 0) { 2342 pdu_complete(pdu, err); 2343 return; 2344 } 2345 trace_v9fs_flush(pdu->tag, pdu->id, tag); 2346 2347 QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 2348 if (cancel_pdu->tag == tag) { 2349 break; 2350 } 2351 } 2352 if (cancel_pdu) { 2353 cancel_pdu->cancelled = 1; 2354 /* 2355 * Wait for pdu to complete. 2356 */ 2357 qemu_co_queue_wait(&cancel_pdu->complete); 2358 cancel_pdu->cancelled = 0; 2359 pdu_free(cancel_pdu); 2360 } 2361 pdu_complete(pdu, 7); 2362 } 2363 2364 static void v9fs_link(void *opaque) 2365 { 2366 V9fsPDU *pdu = opaque; 2367 int32_t dfid, oldfid; 2368 V9fsFidState *dfidp, *oldfidp; 2369 V9fsString name; 2370 size_t offset = 7; 2371 int err = 0; 2372 2373 v9fs_string_init(&name); 2374 err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 2375 if (err < 0) { 2376 goto out_nofid; 2377 } 2378 trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 2379 2380 if (name_is_illegal(name.data)) { 2381 err = -ENOENT; 2382 goto out_nofid; 2383 } 2384 2385 if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2386 err = -EEXIST; 2387 goto out_nofid; 2388 } 2389 2390 dfidp = get_fid(pdu, dfid); 2391 if (dfidp == NULL) { 2392 err = -ENOENT; 2393 goto out_nofid; 2394 } 2395 2396 oldfidp = get_fid(pdu, oldfid); 2397 if (oldfidp == NULL) { 2398 err = -ENOENT; 2399 goto out; 2400 } 2401 err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 2402 if (!err) { 2403 err = offset; 2404 } 2405 out: 2406 put_fid(pdu, dfidp); 2407 out_nofid: 2408 v9fs_string_free(&name); 2409 pdu_complete(pdu, err); 2410 } 2411 2412 /* Only works with path name based fid */ 2413 static void v9fs_remove(void *opaque) 2414 { 2415 int32_t fid; 2416 int err = 0; 2417 size_t offset = 7; 2418 V9fsFidState *fidp; 2419 V9fsPDU *pdu = opaque; 2420 2421 err = pdu_unmarshal(pdu, offset, "d", &fid); 2422 if (err < 0) { 2423 goto out_nofid; 2424 } 2425 trace_v9fs_remove(pdu->tag, pdu->id, fid); 2426 2427 fidp = get_fid(pdu, fid); 2428 if (fidp == NULL) { 2429 err = -EINVAL; 2430 goto out_nofid; 2431 } 2432 /* if fs driver is not path based, return EOPNOTSUPP */ 2433 if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 2434 err = -EOPNOTSUPP; 2435 goto out_err; 2436 } 2437 /* 2438 * IF the file is unlinked, we cannot reopen 2439 * the file later. So don't reclaim fd 2440 */ 2441 err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 2442 if (err < 0) { 2443 goto out_err; 2444 } 2445 err = v9fs_co_remove(pdu, &fidp->path); 2446 if (!err) { 2447 err = offset; 2448 } 2449 out_err: 2450 /* For TREMOVE we need to clunk the fid even on failed remove */ 2451 clunk_fid(pdu->s, fidp->fid); 2452 put_fid(pdu, fidp); 2453 out_nofid: 2454 pdu_complete(pdu, err); 2455 } 2456 2457 static void v9fs_unlinkat(void *opaque) 2458 { 2459 int err = 0; 2460 V9fsString name; 2461 int32_t dfid, flags; 2462 size_t offset = 7; 2463 V9fsPath path; 2464 V9fsFidState *dfidp; 2465 V9fsPDU *pdu = opaque; 2466 2467 v9fs_string_init(&name); 2468 err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 2469 if (err < 0) { 2470 goto out_nofid; 2471 } 2472 2473 if (name_is_illegal(name.data)) { 2474 err = -ENOENT; 2475 goto out_nofid; 2476 } 2477 2478 if (!strcmp(".", name.data)) { 2479 err = -EINVAL; 2480 goto out_nofid; 2481 } 2482 2483 if (!strcmp("..", name.data)) { 2484 err = -ENOTEMPTY; 2485 goto out_nofid; 2486 } 2487 2488 dfidp = get_fid(pdu, dfid); 2489 if (dfidp == NULL) { 2490 err = -EINVAL; 2491 goto out_nofid; 2492 } 2493 /* 2494 * IF the file is unlinked, we cannot reopen 2495 * the file later. So don't reclaim fd 2496 */ 2497 v9fs_path_init(&path); 2498 err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 2499 if (err < 0) { 2500 goto out_err; 2501 } 2502 err = v9fs_mark_fids_unreclaim(pdu, &path); 2503 if (err < 0) { 2504 goto out_err; 2505 } 2506 err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, flags); 2507 if (!err) { 2508 err = offset; 2509 } 2510 out_err: 2511 put_fid(pdu, dfidp); 2512 v9fs_path_free(&path); 2513 out_nofid: 2514 pdu_complete(pdu, err); 2515 v9fs_string_free(&name); 2516 } 2517 2518 2519 /* Only works with path name based fid */ 2520 static int v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 2521 int32_t newdirfid, V9fsString *name) 2522 { 2523 char *end; 2524 int err = 0; 2525 V9fsPath new_path; 2526 V9fsFidState *tfidp; 2527 V9fsState *s = pdu->s; 2528 V9fsFidState *dirfidp = NULL; 2529 char *old_name, *new_name; 2530 2531 v9fs_path_init(&new_path); 2532 if (newdirfid != -1) { 2533 dirfidp = get_fid(pdu, newdirfid); 2534 if (dirfidp == NULL) { 2535 err = -ENOENT; 2536 goto out_nofid; 2537 } 2538 BUG_ON(dirfidp->fid_type != P9_FID_NONE); 2539 v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 2540 } else { 2541 old_name = fidp->path.data; 2542 end = strrchr(old_name, '/'); 2543 if (end) { 2544 end++; 2545 } else { 2546 end = old_name; 2547 } 2548 new_name = g_malloc0(end - old_name + name->size + 1); 2549 strncat(new_name, old_name, end - old_name); 2550 strncat(new_name + (end - old_name), name->data, name->size); 2551 v9fs_co_name_to_path(pdu, NULL, new_name, &new_path); 2552 g_free(new_name); 2553 } 2554 err = v9fs_co_rename(pdu, &fidp->path, &new_path); 2555 if (err < 0) { 2556 goto out; 2557 } 2558 /* 2559 * Fixup fid's pointing to the old name to 2560 * start pointing to the new name 2561 */ 2562 for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { 2563 if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 2564 /* replace the name */ 2565 v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 2566 } 2567 } 2568 out: 2569 if (dirfidp) { 2570 put_fid(pdu, dirfidp); 2571 } 2572 v9fs_path_free(&new_path); 2573 out_nofid: 2574 return err; 2575 } 2576 2577 /* Only works with path name based fid */ 2578 static void v9fs_rename(void *opaque) 2579 { 2580 int32_t fid; 2581 ssize_t err = 0; 2582 size_t offset = 7; 2583 V9fsString name; 2584 int32_t newdirfid; 2585 V9fsFidState *fidp; 2586 V9fsPDU *pdu = opaque; 2587 V9fsState *s = pdu->s; 2588 2589 v9fs_string_init(&name); 2590 err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 2591 if (err < 0) { 2592 goto out_nofid; 2593 } 2594 2595 if (name_is_illegal(name.data)) { 2596 err = -ENOENT; 2597 goto out_nofid; 2598 } 2599 2600 if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2601 err = -EISDIR; 2602 goto out_nofid; 2603 } 2604 2605 fidp = get_fid(pdu, fid); 2606 if (fidp == NULL) { 2607 err = -ENOENT; 2608 goto out_nofid; 2609 } 2610 BUG_ON(fidp->fid_type != P9_FID_NONE); 2611 /* if fs driver is not path based, return EOPNOTSUPP */ 2612 if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 2613 err = -EOPNOTSUPP; 2614 goto out; 2615 } 2616 v9fs_path_write_lock(s); 2617 err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 2618 v9fs_path_unlock(s); 2619 if (!err) { 2620 err = offset; 2621 } 2622 out: 2623 put_fid(pdu, fidp); 2624 out_nofid: 2625 pdu_complete(pdu, err); 2626 v9fs_string_free(&name); 2627 } 2628 2629 static void v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 2630 V9fsString *old_name, V9fsPath *newdir, 2631 V9fsString *new_name) 2632 { 2633 V9fsFidState *tfidp; 2634 V9fsPath oldpath, newpath; 2635 V9fsState *s = pdu->s; 2636 2637 2638 v9fs_path_init(&oldpath); 2639 v9fs_path_init(&newpath); 2640 v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 2641 v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 2642 2643 /* 2644 * Fixup fid's pointing to the old name to 2645 * start pointing to the new name 2646 */ 2647 for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { 2648 if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 2649 /* replace the name */ 2650 v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 2651 } 2652 } 2653 v9fs_path_free(&oldpath); 2654 v9fs_path_free(&newpath); 2655 } 2656 2657 static int v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 2658 V9fsString *old_name, int32_t newdirfid, 2659 V9fsString *new_name) 2660 { 2661 int err = 0; 2662 V9fsState *s = pdu->s; 2663 V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 2664 2665 olddirfidp = get_fid(pdu, olddirfid); 2666 if (olddirfidp == NULL) { 2667 err = -ENOENT; 2668 goto out; 2669 } 2670 if (newdirfid != -1) { 2671 newdirfidp = get_fid(pdu, newdirfid); 2672 if (newdirfidp == NULL) { 2673 err = -ENOENT; 2674 goto out; 2675 } 2676 } else { 2677 newdirfidp = get_fid(pdu, olddirfid); 2678 } 2679 2680 err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 2681 &newdirfidp->path, new_name); 2682 if (err < 0) { 2683 goto out; 2684 } 2685 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 2686 /* Only for path based fid we need to do the below fixup */ 2687 v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 2688 &newdirfidp->path, new_name); 2689 } 2690 out: 2691 if (olddirfidp) { 2692 put_fid(pdu, olddirfidp); 2693 } 2694 if (newdirfidp) { 2695 put_fid(pdu, newdirfidp); 2696 } 2697 return err; 2698 } 2699 2700 static void v9fs_renameat(void *opaque) 2701 { 2702 ssize_t err = 0; 2703 size_t offset = 7; 2704 V9fsPDU *pdu = opaque; 2705 V9fsState *s = pdu->s; 2706 int32_t olddirfid, newdirfid; 2707 V9fsString old_name, new_name; 2708 2709 v9fs_string_init(&old_name); 2710 v9fs_string_init(&new_name); 2711 err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 2712 &old_name, &newdirfid, &new_name); 2713 if (err < 0) { 2714 goto out_err; 2715 } 2716 2717 if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 2718 err = -ENOENT; 2719 goto out_err; 2720 } 2721 2722 if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 2723 !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 2724 err = -EISDIR; 2725 goto out_err; 2726 } 2727 2728 v9fs_path_write_lock(s); 2729 err = v9fs_complete_renameat(pdu, olddirfid, 2730 &old_name, newdirfid, &new_name); 2731 v9fs_path_unlock(s); 2732 if (!err) { 2733 err = offset; 2734 } 2735 2736 out_err: 2737 pdu_complete(pdu, err); 2738 v9fs_string_free(&old_name); 2739 v9fs_string_free(&new_name); 2740 } 2741 2742 static void v9fs_wstat(void *opaque) 2743 { 2744 int32_t fid; 2745 int err = 0; 2746 int16_t unused; 2747 V9fsStat v9stat; 2748 size_t offset = 7; 2749 struct stat stbuf; 2750 V9fsFidState *fidp; 2751 V9fsPDU *pdu = opaque; 2752 2753 v9fs_stat_init(&v9stat); 2754 err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 2755 if (err < 0) { 2756 goto out_nofid; 2757 } 2758 trace_v9fs_wstat(pdu->tag, pdu->id, fid, 2759 v9stat.mode, v9stat.atime, v9stat.mtime); 2760 2761 fidp = get_fid(pdu, fid); 2762 if (fidp == NULL) { 2763 err = -EINVAL; 2764 goto out_nofid; 2765 } 2766 /* do we need to sync the file? */ 2767 if (donttouch_stat(&v9stat)) { 2768 err = v9fs_co_fsync(pdu, fidp, 0); 2769 goto out; 2770 } 2771 if (v9stat.mode != -1) { 2772 uint32_t v9_mode; 2773 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 2774 if (err < 0) { 2775 goto out; 2776 } 2777 v9_mode = stat_to_v9mode(&stbuf); 2778 if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 2779 (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 2780 /* Attempting to change the type */ 2781 err = -EIO; 2782 goto out; 2783 } 2784 err = v9fs_co_chmod(pdu, &fidp->path, 2785 v9mode_to_mode(v9stat.mode, 2786 &v9stat.extension)); 2787 if (err < 0) { 2788 goto out; 2789 } 2790 } 2791 if (v9stat.mtime != -1 || v9stat.atime != -1) { 2792 struct timespec times[2]; 2793 if (v9stat.atime != -1) { 2794 times[0].tv_sec = v9stat.atime; 2795 times[0].tv_nsec = 0; 2796 } else { 2797 times[0].tv_nsec = UTIME_OMIT; 2798 } 2799 if (v9stat.mtime != -1) { 2800 times[1].tv_sec = v9stat.mtime; 2801 times[1].tv_nsec = 0; 2802 } else { 2803 times[1].tv_nsec = UTIME_OMIT; 2804 } 2805 err = v9fs_co_utimensat(pdu, &fidp->path, times); 2806 if (err < 0) { 2807 goto out; 2808 } 2809 } 2810 if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 2811 err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 2812 if (err < 0) { 2813 goto out; 2814 } 2815 } 2816 if (v9stat.name.size != 0) { 2817 err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 2818 if (err < 0) { 2819 goto out; 2820 } 2821 } 2822 if (v9stat.length != -1) { 2823 err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 2824 if (err < 0) { 2825 goto out; 2826 } 2827 } 2828 err = offset; 2829 out: 2830 put_fid(pdu, fidp); 2831 out_nofid: 2832 v9fs_stat_free(&v9stat); 2833 pdu_complete(pdu, err); 2834 } 2835 2836 static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 2837 { 2838 uint32_t f_type; 2839 uint32_t f_bsize; 2840 uint64_t f_blocks; 2841 uint64_t f_bfree; 2842 uint64_t f_bavail; 2843 uint64_t f_files; 2844 uint64_t f_ffree; 2845 uint64_t fsid_val; 2846 uint32_t f_namelen; 2847 size_t offset = 7; 2848 int32_t bsize_factor; 2849 2850 /* 2851 * compute bsize factor based on host file system block size 2852 * and client msize 2853 */ 2854 bsize_factor = (s->msize - P9_IOHDRSZ)/stbuf->f_bsize; 2855 if (!bsize_factor) { 2856 bsize_factor = 1; 2857 } 2858 f_type = stbuf->f_type; 2859 f_bsize = stbuf->f_bsize; 2860 f_bsize *= bsize_factor; 2861 /* 2862 * f_bsize is adjusted(multiplied) by bsize factor, so we need to 2863 * adjust(divide) the number of blocks, free blocks and available 2864 * blocks by bsize factor 2865 */ 2866 f_blocks = stbuf->f_blocks/bsize_factor; 2867 f_bfree = stbuf->f_bfree/bsize_factor; 2868 f_bavail = stbuf->f_bavail/bsize_factor; 2869 f_files = stbuf->f_files; 2870 f_ffree = stbuf->f_ffree; 2871 fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 2872 (unsigned long long)stbuf->f_fsid.__val[1] << 32; 2873 f_namelen = stbuf->f_namelen; 2874 2875 return pdu_marshal(pdu, offset, "ddqqqqqqd", 2876 f_type, f_bsize, f_blocks, f_bfree, 2877 f_bavail, f_files, f_ffree, 2878 fsid_val, f_namelen); 2879 } 2880 2881 static void v9fs_statfs(void *opaque) 2882 { 2883 int32_t fid; 2884 ssize_t retval = 0; 2885 size_t offset = 7; 2886 V9fsFidState *fidp; 2887 struct statfs stbuf; 2888 V9fsPDU *pdu = opaque; 2889 V9fsState *s = pdu->s; 2890 2891 retval = pdu_unmarshal(pdu, offset, "d", &fid); 2892 if (retval < 0) { 2893 goto out_nofid; 2894 } 2895 fidp = get_fid(pdu, fid); 2896 if (fidp == NULL) { 2897 retval = -ENOENT; 2898 goto out_nofid; 2899 } 2900 retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 2901 if (retval < 0) { 2902 goto out; 2903 } 2904 retval = v9fs_fill_statfs(s, pdu, &stbuf); 2905 if (retval < 0) { 2906 goto out; 2907 } 2908 retval += offset; 2909 out: 2910 put_fid(pdu, fidp); 2911 out_nofid: 2912 pdu_complete(pdu, retval); 2913 } 2914 2915 static void v9fs_mknod(void *opaque) 2916 { 2917 2918 int mode; 2919 gid_t gid; 2920 int32_t fid; 2921 V9fsQID qid; 2922 int err = 0; 2923 int major, minor; 2924 size_t offset = 7; 2925 V9fsString name; 2926 struct stat stbuf; 2927 V9fsFidState *fidp; 2928 V9fsPDU *pdu = opaque; 2929 2930 v9fs_string_init(&name); 2931 err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 2932 &major, &minor, &gid); 2933 if (err < 0) { 2934 goto out_nofid; 2935 } 2936 trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 2937 2938 if (name_is_illegal(name.data)) { 2939 err = -ENOENT; 2940 goto out_nofid; 2941 } 2942 2943 if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2944 err = -EEXIST; 2945 goto out_nofid; 2946 } 2947 2948 fidp = get_fid(pdu, fid); 2949 if (fidp == NULL) { 2950 err = -ENOENT; 2951 goto out_nofid; 2952 } 2953 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 2954 makedev(major, minor), mode, &stbuf); 2955 if (err < 0) { 2956 goto out; 2957 } 2958 stat_to_qid(&stbuf, &qid); 2959 err = pdu_marshal(pdu, offset, "Q", &qid); 2960 if (err < 0) { 2961 goto out; 2962 } 2963 err += offset; 2964 trace_v9fs_mknod_return(pdu->tag, pdu->id, 2965 qid.type, qid.version, qid.path); 2966 out: 2967 put_fid(pdu, fidp); 2968 out_nofid: 2969 pdu_complete(pdu, err); 2970 v9fs_string_free(&name); 2971 } 2972 2973 /* 2974 * Implement posix byte range locking code 2975 * Server side handling of locking code is very simple, because 9p server in 2976 * QEMU can handle only one client. And most of the lock handling 2977 * (like conflict, merging) etc is done by the VFS layer itself, so no need to 2978 * do any thing in * qemu 9p server side lock code path. 2979 * So when a TLOCK request comes, always return success 2980 */ 2981 static void v9fs_lock(void *opaque) 2982 { 2983 int8_t status; 2984 V9fsFlock flock; 2985 size_t offset = 7; 2986 struct stat stbuf; 2987 V9fsFidState *fidp; 2988 int32_t fid, err = 0; 2989 V9fsPDU *pdu = opaque; 2990 2991 status = P9_LOCK_ERROR; 2992 v9fs_string_init(&flock.client_id); 2993 err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 2994 &flock.flags, &flock.start, &flock.length, 2995 &flock.proc_id, &flock.client_id); 2996 if (err < 0) { 2997 goto out_nofid; 2998 } 2999 trace_v9fs_lock(pdu->tag, pdu->id, fid, 3000 flock.type, flock.start, flock.length); 3001 3002 3003 /* We support only block flag now (that too ignored currently) */ 3004 if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 3005 err = -EINVAL; 3006 goto out_nofid; 3007 } 3008 fidp = get_fid(pdu, fid); 3009 if (fidp == NULL) { 3010 err = -ENOENT; 3011 goto out_nofid; 3012 } 3013 err = v9fs_co_fstat(pdu, fidp, &stbuf); 3014 if (err < 0) { 3015 goto out; 3016 } 3017 status = P9_LOCK_SUCCESS; 3018 out: 3019 put_fid(pdu, fidp); 3020 out_nofid: 3021 err = pdu_marshal(pdu, offset, "b", status); 3022 if (err > 0) { 3023 err += offset; 3024 } 3025 trace_v9fs_lock_return(pdu->tag, pdu->id, status); 3026 pdu_complete(pdu, err); 3027 v9fs_string_free(&flock.client_id); 3028 } 3029 3030 /* 3031 * When a TGETLOCK request comes, always return success because all lock 3032 * handling is done by client's VFS layer. 3033 */ 3034 static void v9fs_getlock(void *opaque) 3035 { 3036 size_t offset = 7; 3037 struct stat stbuf; 3038 V9fsFidState *fidp; 3039 V9fsGetlock glock; 3040 int32_t fid, err = 0; 3041 V9fsPDU *pdu = opaque; 3042 3043 v9fs_string_init(&glock.client_id); 3044 err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 3045 &glock.start, &glock.length, &glock.proc_id, 3046 &glock.client_id); 3047 if (err < 0) { 3048 goto out_nofid; 3049 } 3050 trace_v9fs_getlock(pdu->tag, pdu->id, fid, 3051 glock.type, glock.start, glock.length); 3052 3053 fidp = get_fid(pdu, fid); 3054 if (fidp == NULL) { 3055 err = -ENOENT; 3056 goto out_nofid; 3057 } 3058 err = v9fs_co_fstat(pdu, fidp, &stbuf); 3059 if (err < 0) { 3060 goto out; 3061 } 3062 glock.type = P9_LOCK_TYPE_UNLCK; 3063 err = pdu_marshal(pdu, offset, "bqqds", glock.type, 3064 glock.start, glock.length, glock.proc_id, 3065 &glock.client_id); 3066 if (err < 0) { 3067 goto out; 3068 } 3069 err += offset; 3070 trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 3071 glock.length, glock.proc_id); 3072 out: 3073 put_fid(pdu, fidp); 3074 out_nofid: 3075 pdu_complete(pdu, err); 3076 v9fs_string_free(&glock.client_id); 3077 } 3078 3079 static void v9fs_mkdir(void *opaque) 3080 { 3081 V9fsPDU *pdu = opaque; 3082 size_t offset = 7; 3083 int32_t fid; 3084 struct stat stbuf; 3085 V9fsQID qid; 3086 V9fsString name; 3087 V9fsFidState *fidp; 3088 gid_t gid; 3089 int mode; 3090 int err = 0; 3091 3092 v9fs_string_init(&name); 3093 err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 3094 if (err < 0) { 3095 goto out_nofid; 3096 } 3097 trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 3098 3099 if (name_is_illegal(name.data)) { 3100 err = -ENOENT; 3101 goto out_nofid; 3102 } 3103 3104 if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3105 err = -EEXIST; 3106 goto out_nofid; 3107 } 3108 3109 fidp = get_fid(pdu, fid); 3110 if (fidp == NULL) { 3111 err = -ENOENT; 3112 goto out_nofid; 3113 } 3114 err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 3115 if (err < 0) { 3116 goto out; 3117 } 3118 stat_to_qid(&stbuf, &qid); 3119 err = pdu_marshal(pdu, offset, "Q", &qid); 3120 if (err < 0) { 3121 goto out; 3122 } 3123 err += offset; 3124 trace_v9fs_mkdir_return(pdu->tag, pdu->id, 3125 qid.type, qid.version, qid.path, err); 3126 out: 3127 put_fid(pdu, fidp); 3128 out_nofid: 3129 pdu_complete(pdu, err); 3130 v9fs_string_free(&name); 3131 } 3132 3133 static void v9fs_xattrwalk(void *opaque) 3134 { 3135 int64_t size; 3136 V9fsString name; 3137 ssize_t err = 0; 3138 size_t offset = 7; 3139 int32_t fid, newfid; 3140 V9fsFidState *file_fidp; 3141 V9fsFidState *xattr_fidp = NULL; 3142 V9fsPDU *pdu = opaque; 3143 V9fsState *s = pdu->s; 3144 3145 v9fs_string_init(&name); 3146 err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 3147 if (err < 0) { 3148 goto out_nofid; 3149 } 3150 trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 3151 3152 file_fidp = get_fid(pdu, fid); 3153 if (file_fidp == NULL) { 3154 err = -ENOENT; 3155 goto out_nofid; 3156 } 3157 xattr_fidp = alloc_fid(s, newfid); 3158 if (xattr_fidp == NULL) { 3159 err = -EINVAL; 3160 goto out; 3161 } 3162 v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3163 if (name.data == NULL) { 3164 /* 3165 * listxattr request. Get the size first 3166 */ 3167 size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 3168 if (size < 0) { 3169 err = size; 3170 clunk_fid(s, xattr_fidp->fid); 3171 goto out; 3172 } 3173 /* 3174 * Read the xattr value 3175 */ 3176 xattr_fidp->fs.xattr.len = size; 3177 xattr_fidp->fid_type = P9_FID_XATTR; 3178 xattr_fidp->fs.xattr.copied_len = -1; 3179 if (size) { 3180 xattr_fidp->fs.xattr.value = g_malloc(size); 3181 err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 3182 xattr_fidp->fs.xattr.value, 3183 xattr_fidp->fs.xattr.len); 3184 if (err < 0) { 3185 clunk_fid(s, xattr_fidp->fid); 3186 goto out; 3187 } 3188 } 3189 err = pdu_marshal(pdu, offset, "q", size); 3190 if (err < 0) { 3191 goto out; 3192 } 3193 err += offset; 3194 } else { 3195 /* 3196 * specific xattr fid. We check for xattr 3197 * presence also collect the xattr size 3198 */ 3199 size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 3200 &name, NULL, 0); 3201 if (size < 0) { 3202 err = size; 3203 clunk_fid(s, xattr_fidp->fid); 3204 goto out; 3205 } 3206 /* 3207 * Read the xattr value 3208 */ 3209 xattr_fidp->fs.xattr.len = size; 3210 xattr_fidp->fid_type = P9_FID_XATTR; 3211 xattr_fidp->fs.xattr.copied_len = -1; 3212 if (size) { 3213 xattr_fidp->fs.xattr.value = g_malloc(size); 3214 err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 3215 &name, xattr_fidp->fs.xattr.value, 3216 xattr_fidp->fs.xattr.len); 3217 if (err < 0) { 3218 clunk_fid(s, xattr_fidp->fid); 3219 goto out; 3220 } 3221 } 3222 err = pdu_marshal(pdu, offset, "q", size); 3223 if (err < 0) { 3224 goto out; 3225 } 3226 err += offset; 3227 } 3228 trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 3229 out: 3230 put_fid(pdu, file_fidp); 3231 if (xattr_fidp) { 3232 put_fid(pdu, xattr_fidp); 3233 } 3234 out_nofid: 3235 pdu_complete(pdu, err); 3236 v9fs_string_free(&name); 3237 } 3238 3239 static void v9fs_xattrcreate(void *opaque) 3240 { 3241 int flags; 3242 int32_t fid; 3243 int64_t size; 3244 ssize_t err = 0; 3245 V9fsString name; 3246 size_t offset = 7; 3247 V9fsFidState *file_fidp; 3248 V9fsFidState *xattr_fidp; 3249 V9fsPDU *pdu = opaque; 3250 3251 v9fs_string_init(&name); 3252 err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 3253 if (err < 0) { 3254 goto out_nofid; 3255 } 3256 trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 3257 3258 file_fidp = get_fid(pdu, fid); 3259 if (file_fidp == NULL) { 3260 err = -EINVAL; 3261 goto out_nofid; 3262 } 3263 /* Make the file fid point to xattr */ 3264 xattr_fidp = file_fidp; 3265 xattr_fidp->fid_type = P9_FID_XATTR; 3266 xattr_fidp->fs.xattr.copied_len = 0; 3267 xattr_fidp->fs.xattr.len = size; 3268 xattr_fidp->fs.xattr.flags = flags; 3269 v9fs_string_init(&xattr_fidp->fs.xattr.name); 3270 v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3271 xattr_fidp->fs.xattr.value = g_malloc(size); 3272 err = offset; 3273 put_fid(pdu, file_fidp); 3274 out_nofid: 3275 pdu_complete(pdu, err); 3276 v9fs_string_free(&name); 3277 } 3278 3279 static void v9fs_readlink(void *opaque) 3280 { 3281 V9fsPDU *pdu = opaque; 3282 size_t offset = 7; 3283 V9fsString target; 3284 int32_t fid; 3285 int err = 0; 3286 V9fsFidState *fidp; 3287 3288 err = pdu_unmarshal(pdu, offset, "d", &fid); 3289 if (err < 0) { 3290 goto out_nofid; 3291 } 3292 trace_v9fs_readlink(pdu->tag, pdu->id, fid); 3293 fidp = get_fid(pdu, fid); 3294 if (fidp == NULL) { 3295 err = -ENOENT; 3296 goto out_nofid; 3297 } 3298 3299 v9fs_string_init(&target); 3300 err = v9fs_co_readlink(pdu, &fidp->path, &target); 3301 if (err < 0) { 3302 goto out; 3303 } 3304 err = pdu_marshal(pdu, offset, "s", &target); 3305 if (err < 0) { 3306 v9fs_string_free(&target); 3307 goto out; 3308 } 3309 err += offset; 3310 trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 3311 v9fs_string_free(&target); 3312 out: 3313 put_fid(pdu, fidp); 3314 out_nofid: 3315 pdu_complete(pdu, err); 3316 } 3317 3318 static CoroutineEntry *pdu_co_handlers[] = { 3319 [P9_TREADDIR] = v9fs_readdir, 3320 [P9_TSTATFS] = v9fs_statfs, 3321 [P9_TGETATTR] = v9fs_getattr, 3322 [P9_TSETATTR] = v9fs_setattr, 3323 [P9_TXATTRWALK] = v9fs_xattrwalk, 3324 [P9_TXATTRCREATE] = v9fs_xattrcreate, 3325 [P9_TMKNOD] = v9fs_mknod, 3326 [P9_TRENAME] = v9fs_rename, 3327 [P9_TLOCK] = v9fs_lock, 3328 [P9_TGETLOCK] = v9fs_getlock, 3329 [P9_TRENAMEAT] = v9fs_renameat, 3330 [P9_TREADLINK] = v9fs_readlink, 3331 [P9_TUNLINKAT] = v9fs_unlinkat, 3332 [P9_TMKDIR] = v9fs_mkdir, 3333 [P9_TVERSION] = v9fs_version, 3334 [P9_TLOPEN] = v9fs_open, 3335 [P9_TATTACH] = v9fs_attach, 3336 [P9_TSTAT] = v9fs_stat, 3337 [P9_TWALK] = v9fs_walk, 3338 [P9_TCLUNK] = v9fs_clunk, 3339 [P9_TFSYNC] = v9fs_fsync, 3340 [P9_TOPEN] = v9fs_open, 3341 [P9_TREAD] = v9fs_read, 3342 #if 0 3343 [P9_TAUTH] = v9fs_auth, 3344 #endif 3345 [P9_TFLUSH] = v9fs_flush, 3346 [P9_TLINK] = v9fs_link, 3347 [P9_TSYMLINK] = v9fs_symlink, 3348 [P9_TCREATE] = v9fs_create, 3349 [P9_TLCREATE] = v9fs_lcreate, 3350 [P9_TWRITE] = v9fs_write, 3351 [P9_TWSTAT] = v9fs_wstat, 3352 [P9_TREMOVE] = v9fs_remove, 3353 }; 3354 3355 static void v9fs_op_not_supp(void *opaque) 3356 { 3357 V9fsPDU *pdu = opaque; 3358 pdu_complete(pdu, -EOPNOTSUPP); 3359 } 3360 3361 static void v9fs_fs_ro(void *opaque) 3362 { 3363 V9fsPDU *pdu = opaque; 3364 pdu_complete(pdu, -EROFS); 3365 } 3366 3367 static inline bool is_read_only_op(V9fsPDU *pdu) 3368 { 3369 switch (pdu->id) { 3370 case P9_TREADDIR: 3371 case P9_TSTATFS: 3372 case P9_TGETATTR: 3373 case P9_TXATTRWALK: 3374 case P9_TLOCK: 3375 case P9_TGETLOCK: 3376 case P9_TREADLINK: 3377 case P9_TVERSION: 3378 case P9_TLOPEN: 3379 case P9_TATTACH: 3380 case P9_TSTAT: 3381 case P9_TWALK: 3382 case P9_TCLUNK: 3383 case P9_TFSYNC: 3384 case P9_TOPEN: 3385 case P9_TREAD: 3386 case P9_TAUTH: 3387 case P9_TFLUSH: 3388 return 1; 3389 default: 3390 return 0; 3391 } 3392 } 3393 3394 void pdu_submit(V9fsPDU *pdu) 3395 { 3396 Coroutine *co; 3397 CoroutineEntry *handler; 3398 V9fsState *s = pdu->s; 3399 3400 if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 3401 (pdu_co_handlers[pdu->id] == NULL)) { 3402 handler = v9fs_op_not_supp; 3403 } else { 3404 handler = pdu_co_handlers[pdu->id]; 3405 } 3406 3407 if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 3408 handler = v9fs_fs_ro; 3409 } 3410 co = qemu_coroutine_create(handler, pdu); 3411 qemu_coroutine_enter(co); 3412 } 3413 3414 /* Returns 0 on success, 1 on failure. */ 3415 int v9fs_device_realize_common(V9fsState *s, Error **errp) 3416 { 3417 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); 3418 int i, len; 3419 struct stat stat; 3420 FsDriverEntry *fse; 3421 V9fsPath path; 3422 int rc = 1; 3423 3424 /* initialize pdu allocator */ 3425 QLIST_INIT(&s->free_list); 3426 QLIST_INIT(&s->active_list); 3427 for (i = 0; i < (MAX_REQ - 1); i++) { 3428 QLIST_INSERT_HEAD(&s->free_list, &v->pdus[i], next); 3429 v->pdus[i].s = s; 3430 v->pdus[i].idx = i; 3431 } 3432 3433 v9fs_path_init(&path); 3434 3435 fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 3436 3437 if (!fse) { 3438 /* We don't have a fsdev identified by fsdev_id */ 3439 error_setg(errp, "9pfs device couldn't find fsdev with the " 3440 "id = %s", 3441 s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 3442 goto out; 3443 } 3444 3445 if (!s->fsconf.tag) { 3446 /* we haven't specified a mount_tag */ 3447 error_setg(errp, "fsdev with id %s needs mount_tag arguments", 3448 s->fsconf.fsdev_id); 3449 goto out; 3450 } 3451 3452 s->ctx.export_flags = fse->export_flags; 3453 s->ctx.fs_root = g_strdup(fse->path); 3454 s->ctx.exops.get_st_gen = NULL; 3455 len = strlen(s->fsconf.tag); 3456 if (len > MAX_TAG_LEN - 1) { 3457 error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 3458 "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 3459 goto out; 3460 } 3461 3462 s->tag = g_strdup(s->fsconf.tag); 3463 s->ctx.uid = -1; 3464 3465 s->ops = fse->ops; 3466 3467 s->fid_list = NULL; 3468 qemu_co_rwlock_init(&s->rename_lock); 3469 3470 if (s->ops->init(&s->ctx) < 0) { 3471 error_setg(errp, "9pfs Failed to initialize fs-driver with id:%s" 3472 " and export path:%s", s->fsconf.fsdev_id, s->ctx.fs_root); 3473 goto out; 3474 } 3475 3476 /* 3477 * Check details of export path, We need to use fs driver 3478 * call back to do that. Since we are in the init path, we don't 3479 * use co-routines here. 3480 */ 3481 if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 3482 error_setg(errp, 3483 "error in converting name to path %s", strerror(errno)); 3484 goto out; 3485 } 3486 if (s->ops->lstat(&s->ctx, &path, &stat)) { 3487 error_setg(errp, "share path %s does not exist", fse->path); 3488 goto out; 3489 } else if (!S_ISDIR(stat.st_mode)) { 3490 error_setg(errp, "share path %s is not a directory", fse->path); 3491 goto out; 3492 } 3493 v9fs_path_free(&path); 3494 3495 rc = 0; 3496 out: 3497 if (rc) { 3498 g_free(s->ctx.fs_root); 3499 g_free(s->tag); 3500 v9fs_path_free(&path); 3501 } 3502 return rc; 3503 } 3504 3505 void v9fs_device_unrealize_common(V9fsState *s, Error **errp) 3506 { 3507 g_free(s->ctx.fs_root); 3508 g_free(s->tag); 3509 } 3510 3511 static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 3512 { 3513 struct rlimit rlim; 3514 if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 3515 error_report("Failed to get the resource limit"); 3516 exit(1); 3517 } 3518 open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3); 3519 open_fd_rc = rlim.rlim_cur/2; 3520 } 3521