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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 | /* * Copyright (c) 2002 Red Hat, Inc. All rights reserved. * * This software may be freely redistributed under the terms of the * GNU General Public License. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Authors: David Woodhouse <dwmw2@infradead.org> * David Howells <dhowells@redhat.com> * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/pagemap.h> #include <linux/sched.h> #include <linux/mount.h> #include <linux/namei.h> #include <linux/iversion.h> #include "internal.h" #include "afs_fs.h" static const struct inode_operations afs_symlink_inode_operations = { .get_link = page_get_link, .listxattr = afs_listxattr, }; static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode) { static unsigned long once_only; pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type); pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n", vnode->status.abort_code, vnode->status.mode, vnode->status.size, vnode->status.data_version); pr_warn("kAFS: vnode %llx:%llx:%x\n", vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); if (parent_vnode) pr_warn("kAFS: dir %llx:%llx:%x\n", parent_vnode->fid.vid, parent_vnode->fid.vnode, parent_vnode->fid.unique); if (!test_and_set_bit(0, &once_only)) dump_stack(); } /* * Set the file size and block count. Estimate the number of 512 bytes blocks * used, rounded up to nearest 1K for consistency with other AFS clients. */ static void afs_set_i_size(struct afs_vnode *vnode, u64 size) { i_size_write(&vnode->vfs_inode, size); vnode->vfs_inode.i_blocks = ((size + 1023) >> 10) << 1; } /* * Initialise an inode from the vnode status. */ static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key, struct afs_cb_interest *cbi, struct afs_vnode *parent_vnode, struct afs_status_cb *scb) { struct afs_cb_interest *old_cbi = NULL; struct afs_file_status *status = &scb->status; struct inode *inode = AFS_VNODE_TO_I(vnode); struct timespec64 t; _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", status->type, status->nlink, (unsigned long long) status->size, status->data_version, status->mode); write_seqlock(&vnode->cb_lock); vnode->status = *status; t = status->mtime_client; inode->i_ctime = t; inode->i_mtime = t; inode->i_atime = t; inode->i_uid = make_kuid(&init_user_ns, status->owner); inode->i_gid = make_kgid(&init_user_ns, status->group); set_nlink(&vnode->vfs_inode, status->nlink); switch (status->type) { case AFS_FTYPE_FILE: inode->i_mode = S_IFREG | status->mode; inode->i_op = &afs_file_inode_operations; inode->i_fop = &afs_file_operations; inode->i_mapping->a_ops = &afs_fs_aops; break; case AFS_FTYPE_DIR: inode->i_mode = S_IFDIR | status->mode; inode->i_op = &afs_dir_inode_operations; inode->i_fop = &afs_dir_file_operations; inode->i_mapping->a_ops = &afs_dir_aops; break; case AFS_FTYPE_SYMLINK: /* Symlinks with a mode of 0644 are actually mountpoints. */ if ((status->mode & 0777) == 0644) { inode->i_flags |= S_AUTOMOUNT; set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); inode->i_mode = S_IFDIR | 0555; inode->i_op = &afs_mntpt_inode_operations; inode->i_fop = &afs_mntpt_file_operations; inode->i_mapping->a_ops = &afs_fs_aops; } else { inode->i_mode = S_IFLNK | status->mode; inode->i_op = &afs_symlink_inode_operations; inode->i_mapping->a_ops = &afs_fs_aops; } inode_nohighmem(inode); break; default: dump_vnode(vnode, parent_vnode); write_sequnlock(&vnode->cb_lock); return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type); } afs_set_i_size(vnode, status->size); vnode->invalid_before = status->data_version; inode_set_iversion_raw(&vnode->vfs_inode, status->data_version); if (!scb->have_cb) { /* it's a symlink we just created (the fileserver * didn't give us a callback) */ vnode->cb_expires_at = ktime_get_real_seconds(); } else { vnode->cb_expires_at = scb->callback.expires_at; old_cbi = rcu_dereference_protected(vnode->cb_interest, lockdep_is_held(&vnode->cb_lock.lock)); if (cbi != old_cbi) rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(cbi)); else old_cbi = NULL; set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); } write_sequnlock(&vnode->cb_lock); afs_put_cb_interest(afs_v2net(vnode), old_cbi); return 0; } /* * Update the core inode struct from a returned status record. */ static void afs_apply_status(struct afs_fs_cursor *fc, struct afs_vnode *vnode, struct afs_status_cb *scb, const afs_dataversion_t *expected_version) { struct afs_file_status *status = &scb->status; struct timespec64 t; umode_t mode; bool data_changed = false; BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags)); if (status->type != vnode->status.type) { pr_warning("Vnode %llx:%llx:%x changed type %u to %u\n", vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, status->type, vnode->status.type); afs_protocol_error(NULL, -EBADMSG, afs_eproto_bad_status); return; } if (status->nlink != vnode->status.nlink) set_nlink(&vnode->vfs_inode, status->nlink); if (status->owner != vnode->status.owner) vnode->vfs_inode.i_uid = make_kuid(&init_user_ns, status->owner); if (status->group != vnode->status.group) vnode->vfs_inode.i_gid = make_kgid(&init_user_ns, status->group); if (status->mode != vnode->status.mode) { mode = vnode->vfs_inode.i_mode; mode &= ~S_IALLUGO; mode |= status->mode; WRITE_ONCE(vnode->vfs_inode.i_mode, mode); } t = status->mtime_client; vnode->vfs_inode.i_ctime = t; vnode->vfs_inode.i_mtime = t; vnode->vfs_inode.i_atime = t; if (vnode->status.data_version != status->data_version) data_changed = true; vnode->status = *status; if (expected_version && *expected_version != status->data_version) { if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s\n", vnode->fid.vid, vnode->fid.vnode, (unsigned long long)*expected_version, (unsigned long long)status->data_version, fc->type ? fc->type->name : "???"); vnode->invalid_before = status->data_version; if (vnode->status.type == AFS_FTYPE_DIR) { if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) afs_stat_v(vnode, n_inval); } else { set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags); } } else if (vnode->status.type == AFS_FTYPE_DIR) { /* Expected directory change is handled elsewhere so * that we can locally edit the directory and save on a * download. */ if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) data_changed = false; } if (data_changed) { inode_set_iversion_raw(&vnode->vfs_inode, status->data_version); afs_set_i_size(vnode, status->size); } } /* * Apply a callback to a vnode. */ static void afs_apply_callback(struct afs_fs_cursor *fc, struct afs_vnode *vnode, struct afs_status_cb *scb, unsigned int cb_break) { struct afs_cb_interest *old; struct afs_callback *cb = &scb->callback; if (!afs_cb_is_broken(cb_break, vnode, fc->cbi)) { vnode->cb_expires_at = cb->expires_at; old = rcu_dereference_protected(vnode->cb_interest, lockdep_is_held(&vnode->cb_lock.lock)); if (old != fc->cbi) { rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(fc->cbi)); afs_put_cb_interest(afs_v2net(vnode), old); } set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); } } /* * Apply the received status and callback to an inode all in the same critical * section to avoid races with afs_validate(). */ void afs_vnode_commit_status(struct afs_fs_cursor *fc, struct afs_vnode *vnode, unsigned int cb_break, const afs_dataversion_t *expected_version, struct afs_status_cb *scb) { if (fc->ac.error != 0) return; write_seqlock(&vnode->cb_lock); if (scb->have_error) { if (scb->status.abort_code == VNOVNODE) { set_bit(AFS_VNODE_DELETED, &vnode->flags); clear_nlink(&vnode->vfs_inode); __afs_break_callback(vnode); } } else { if (scb->have_status) afs_apply_status(fc, vnode, scb, expected_version); if (scb->have_cb) afs_apply_callback(fc, vnode, scb, cb_break); } write_sequnlock(&vnode->cb_lock); if (fc->ac.error == 0 && scb->have_status) afs_cache_permit(vnode, fc->key, cb_break, scb); } /* * Fetch file status from the volume. */ int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new, afs_access_t *_caller_access) { struct afs_status_cb *scb; struct afs_fs_cursor fc; int ret; _enter("%s,{%llx:%llu.%u,S=%lx}", vnode->volume->name, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, vnode->flags); scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); if (!scb) return -ENOMEM; ret = -ERESTARTSYS; if (afs_begin_vnode_operation(&fc, vnode, key, true)) { afs_dataversion_t data_version = vnode->status.data_version; while (afs_select_fileserver(&fc)) { fc.cb_break = afs_calc_vnode_cb_break(vnode); afs_fs_fetch_file_status(&fc, scb, NULL); } if (fc.error) { /* Do nothing. */ } else if (is_new) { ret = afs_inode_init_from_status(vnode, key, fc.cbi, NULL, scb); fc.error = ret; if (ret == 0) afs_cache_permit(vnode, key, fc.cb_break, scb); } else { afs_vnode_commit_status(&fc, vnode, fc.cb_break, &data_version, scb); } afs_check_for_remote_deletion(&fc, vnode); ret = afs_end_vnode_operation(&fc); } if (ret == 0 && _caller_access) *_caller_access = scb->status.caller_access; kfree(scb); _leave(" = %d", ret); return ret; } /* * iget5() comparator */ int afs_iget5_test(struct inode *inode, void *opaque) { struct afs_iget_data *iget_data = opaque; struct afs_vnode *vnode = AFS_FS_I(inode); return memcmp(&vnode->fid, &iget_data->fid, sizeof(iget_data->fid)) == 0; } /* * iget5() comparator for inode created by autocell operations * * These pseudo inodes don't match anything. */ static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque) { return 0; } /* * iget5() inode initialiser */ static int afs_iget5_set(struct inode *inode, void *opaque) { struct afs_iget_data *iget_data = opaque; struct afs_vnode *vnode = AFS_FS_I(inode); vnode->fid = iget_data->fid; vnode->volume = iget_data->volume; vnode->cb_v_break = iget_data->cb_v_break; vnode->cb_s_break = iget_data->cb_s_break; /* YFS supports 96-bit vnode IDs, but Linux only supports * 64-bit inode numbers. */ inode->i_ino = iget_data->fid.vnode; inode->i_generation = iget_data->fid.unique; return 0; } /* * Create an inode for a dynamic root directory or an autocell dynamic * automount dir. */ struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root) { struct afs_super_info *as; struct afs_vnode *vnode; struct inode *inode; static atomic_t afs_autocell_ino; struct afs_iget_data iget_data = { .cb_v_break = 0, .cb_s_break = 0, }; _enter(""); as = sb->s_fs_info; if (as->volume) { iget_data.volume = as->volume; iget_data.fid.vid = as->volume->vid; } if (root) { iget_data.fid.vnode = 1; iget_data.fid.unique = 1; } else { iget_data.fid.vnode = atomic_inc_return(&afs_autocell_ino); iget_data.fid.unique = 0; } inode = iget5_locked(sb, iget_data.fid.vnode, afs_iget5_pseudo_dir_test, afs_iget5_set, &iget_data); if (!inode) { _leave(" = -ENOMEM"); return ERR_PTR(-ENOMEM); } _debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }", inode, inode->i_ino, iget_data.fid.vid, iget_data.fid.vnode, iget_data.fid.unique); vnode = AFS_FS_I(inode); /* there shouldn't be an existing inode */ BUG_ON(!(inode->i_state & I_NEW)); inode->i_size = 0; inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; if (root) { inode->i_op = &afs_dynroot_inode_operations; inode->i_fop = &afs_dynroot_file_operations; } else { inode->i_op = &afs_autocell_inode_operations; } set_nlink(inode, 2); inode->i_uid = GLOBAL_ROOT_UID; inode->i_gid = GLOBAL_ROOT_GID; inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode); inode->i_blocks = 0; inode_set_iversion_raw(inode, 0); inode->i_generation = 0; set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags); if (!root) { set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); inode->i_flags |= S_AUTOMOUNT; } inode->i_flags |= S_NOATIME; unlock_new_inode(inode); _leave(" = %p", inode); return inode; } /* * Get a cache cookie for an inode. */ static void afs_get_inode_cache(struct afs_vnode *vnode) { #ifdef CONFIG_AFS_FSCACHE struct { u32 vnode_id; u32 unique; u32 vnode_id_ext[2]; /* Allow for a 96-bit key */ } __packed key; struct afs_vnode_cache_aux aux; if (vnode->status.type == AFS_FTYPE_DIR) { vnode->cache = NULL; return; } key.vnode_id = vnode->fid.vnode; key.unique = vnode->fid.unique; key.vnode_id_ext[0] = vnode->fid.vnode >> 32; key.vnode_id_ext[1] = vnode->fid.vnode_hi; aux.data_version = vnode->status.data_version; vnode->cache = fscache_acquire_cookie(vnode->volume->cache, &afs_vnode_cache_index_def, &key, sizeof(key), &aux, sizeof(aux), vnode, vnode->status.size, true); #endif } /* * inode retrieval */ struct inode *afs_iget(struct super_block *sb, struct key *key, struct afs_iget_data *iget_data, struct afs_status_cb *scb, struct afs_cb_interest *cbi, struct afs_vnode *parent_vnode) { struct afs_super_info *as; struct afs_vnode *vnode; struct afs_fid *fid = &iget_data->fid; struct inode *inode; int ret; _enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique); as = sb->s_fs_info; iget_data->volume = as->volume; inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, iget_data); if (!inode) { _leave(" = -ENOMEM"); return ERR_PTR(-ENOMEM); } _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", inode, fid->vid, fid->vnode, fid->unique); vnode = AFS_FS_I(inode); /* deal with an existing inode */ if (!(inode->i_state & I_NEW)) { _leave(" = %p", inode); return inode; } if (!scb) { /* it's a remotely extant inode */ ret = afs_fetch_status(vnode, key, true, NULL); if (ret < 0) goto bad_inode; } else { ret = afs_inode_init_from_status(vnode, key, cbi, parent_vnode, scb); if (ret < 0) goto bad_inode; } afs_get_inode_cache(vnode); /* success */ clear_bit(AFS_VNODE_UNSET, &vnode->flags); inode->i_flags |= S_NOATIME; unlock_new_inode(inode); _leave(" = %p", inode); return inode; /* failure */ bad_inode: iget_failed(inode); _leave(" = %d [bad]", ret); return ERR_PTR(ret); } /* * mark the data attached to an inode as obsolete due to a write on the server * - might also want to ditch all the outstanding writes and dirty pages */ void afs_zap_data(struct afs_vnode *vnode) { _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); #ifdef CONFIG_AFS_FSCACHE fscache_invalidate(vnode->cache); #endif /* nuke all the non-dirty pages that aren't locked, mapped or being * written back in a regular file and completely discard the pages in a * directory or symlink */ if (S_ISREG(vnode->vfs_inode.i_mode)) invalidate_remote_inode(&vnode->vfs_inode); else invalidate_inode_pages2(vnode->vfs_inode.i_mapping); } /* * Check the validity of a vnode/inode. */ bool afs_check_validity(struct afs_vnode *vnode) { struct afs_cb_interest *cbi; struct afs_server *server; struct afs_volume *volume = vnode->volume; time64_t now = ktime_get_real_seconds(); bool valid, need_clear = false; unsigned int cb_break, cb_s_break, cb_v_break; int seq = 0; do { read_seqbegin_or_lock(&vnode->cb_lock, &seq); cb_v_break = READ_ONCE(volume->cb_v_break); cb_break = vnode->cb_break; if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { cbi = rcu_dereference(vnode->cb_interest); server = rcu_dereference(cbi->server); cb_s_break = READ_ONCE(server->cb_s_break); if (vnode->cb_s_break != cb_s_break || vnode->cb_v_break != cb_v_break) { vnode->cb_s_break = cb_s_break; vnode->cb_v_break = cb_v_break; need_clear = true; valid = false; } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { need_clear = true; valid = false; } else if (vnode->cb_expires_at - 10 <= now) { need_clear = true; valid = false; } else { valid = true; } } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { valid = true; } else { vnode->cb_v_break = cb_v_break; valid = false; } } while (need_seqretry(&vnode->cb_lock, seq)); done_seqretry(&vnode->cb_lock, seq); if (need_clear) { write_seqlock(&vnode->cb_lock); if (cb_break == vnode->cb_break) __afs_break_callback(vnode); write_sequnlock(&vnode->cb_lock); valid = false; } return valid; } /* * validate a vnode/inode * - there are several things we need to check * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, * symlink) * - parent dir metadata changed (security changes) * - dentry data changed (write, truncate) * - dentry metadata changed (security changes) */ int afs_validate(struct afs_vnode *vnode, struct key *key) { bool valid; int ret; _enter("{v={%llx:%llu} fl=%lx},%x", vnode->fid.vid, vnode->fid.vnode, vnode->flags, key_serial(key)); rcu_read_lock(); valid = afs_check_validity(vnode); rcu_read_unlock(); if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) clear_nlink(&vnode->vfs_inode); if (valid) goto valid; down_write(&vnode->validate_lock); /* if the promise has expired, we need to check the server again to get * a new promise - note that if the (parent) directory's metadata was * changed then the security may be different and we may no longer have * access */ if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { _debug("not promised"); ret = afs_fetch_status(vnode, key, false, NULL); if (ret < 0) { if (ret == -ENOENT) { set_bit(AFS_VNODE_DELETED, &vnode->flags); ret = -ESTALE; } goto error_unlock; } _debug("new promise [fl=%lx]", vnode->flags); } if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { _debug("file already deleted"); ret = -ESTALE; goto error_unlock; } /* if the vnode's data version number changed then its contents are * different */ if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) afs_zap_data(vnode); up_write(&vnode->validate_lock); valid: _leave(" = 0"); return 0; error_unlock: up_write(&vnode->validate_lock); _leave(" = %d", ret); return ret; } /* * read the attributes of an inode */ int afs_getattr(const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags) { struct inode *inode = d_inode(path->dentry); struct afs_vnode *vnode = AFS_FS_I(inode); int seq = 0; _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); do { read_seqbegin_or_lock(&vnode->cb_lock, &seq); generic_fillattr(inode, stat); } while (need_seqretry(&vnode->cb_lock, seq)); done_seqretry(&vnode->cb_lock, seq); return 0; } /* * discard an AFS inode */ int afs_drop_inode(struct inode *inode) { _enter(""); if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) return generic_delete_inode(inode); else return generic_drop_inode(inode); } /* * clear an AFS inode */ void afs_evict_inode(struct inode *inode) { struct afs_cb_interest *cbi; struct afs_vnode *vnode; vnode = AFS_FS_I(inode); _enter("{%llx:%llu.%d}", vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); _debug("CLEAR INODE %p", inode); ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); truncate_inode_pages_final(&inode->i_data); clear_inode(inode); write_seqlock(&vnode->cb_lock); cbi = rcu_dereference_protected(vnode->cb_interest, lockdep_is_held(&vnode->cb_lock.lock)); if (cbi) { afs_put_cb_interest(afs_i2net(inode), cbi); rcu_assign_pointer(vnode->cb_interest, NULL); } write_sequnlock(&vnode->cb_lock); while (!list_empty(&vnode->wb_keys)) { struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, struct afs_wb_key, vnode_link); list_del(&wbk->vnode_link); afs_put_wb_key(wbk); } #ifdef CONFIG_AFS_FSCACHE { struct afs_vnode_cache_aux aux; aux.data_version = vnode->status.data_version; fscache_relinquish_cookie(vnode->cache, &aux, test_bit(AFS_VNODE_DELETED, &vnode->flags)); vnode->cache = NULL; } #endif afs_prune_wb_keys(vnode); afs_put_permits(rcu_access_pointer(vnode->permit_cache)); key_put(vnode->silly_key); vnode->silly_key = NULL; key_put(vnode->lock_key); vnode->lock_key = NULL; _leave(""); } /* * set the attributes of an inode */ int afs_setattr(struct dentry *dentry, struct iattr *attr) { struct afs_fs_cursor fc; struct afs_status_cb *scb; struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); struct key *key; int ret = -ENOMEM; _enter("{%llx:%llu},{n=%pd},%x", vnode->fid.vid, vnode->fid.vnode, dentry, attr->ia_valid); if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_MTIME))) { _leave(" = 0 [unsupported]"); return 0; } scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); if (!scb) goto error; /* flush any dirty data outstanding on a regular file */ if (S_ISREG(vnode->vfs_inode.i_mode)) filemap_write_and_wait(vnode->vfs_inode.i_mapping); if (attr->ia_valid & ATTR_FILE) { key = afs_file_key(attr->ia_file); } else { key = afs_request_key(vnode->volume->cell); if (IS_ERR(key)) { ret = PTR_ERR(key); goto error_scb; } } ret = -ERESTARTSYS; if (afs_begin_vnode_operation(&fc, vnode, key, false)) { afs_dataversion_t data_version = vnode->status.data_version; if (attr->ia_valid & ATTR_SIZE) data_version++; while (afs_select_fileserver(&fc)) { fc.cb_break = afs_calc_vnode_cb_break(vnode); afs_fs_setattr(&fc, attr, scb); } afs_check_for_remote_deletion(&fc, vnode); afs_vnode_commit_status(&fc, vnode, fc.cb_break, &data_version, scb); ret = afs_end_vnode_operation(&fc); } if (!(attr->ia_valid & ATTR_FILE)) key_put(key); error_scb: kfree(scb); error: _leave(" = %d", ret); return ret; } |