1 /* 2 * Copyright (c) 2002 Red Hat, Inc. All rights reserved. 3 * 4 * This software may be freely redistributed under the terms of the 5 * GNU General Public License. 6 * 7 * You should have received a copy of the GNU General Public License 8 * along with this program; if not, write to the Free Software 9 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 10 * 11 * Authors: David Woodhouse <dwmw2@infradead.org> 12 * David Howells <dhowells@redhat.com> 13 * 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/fs.h> 20 #include <linux/pagemap.h> 21 #include <linux/sched.h> 22 #include <linux/mount.h> 23 #include <linux/namei.h> 24 #include <linux/iversion.h> 25 #include "internal.h" 26 #include "afs_fs.h" 27 28 static const struct inode_operations afs_symlink_inode_operations = { 29 .get_link = page_get_link, 30 }; 31 32 static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode) 33 { 34 static unsigned long once_only; 35 36 pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type); 37 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n", 38 vnode->status.abort_code, 39 vnode->status.mode, 40 vnode->status.size, 41 vnode->status.data_version); 42 pr_warn("kAFS: vnode %llx:%llx:%x\n", 43 vnode->fid.vid, 44 vnode->fid.vnode, 45 vnode->fid.unique); 46 if (parent_vnode) 47 pr_warn("kAFS: dir %llx:%llx:%x\n", 48 parent_vnode->fid.vid, 49 parent_vnode->fid.vnode, 50 parent_vnode->fid.unique); 51 52 if (!test_and_set_bit(0, &once_only)) 53 dump_stack(); 54 } 55 56 /* 57 * Initialise an inode from the vnode status. 58 */ 59 static int afs_inode_init_from_status(struct afs_operation *op, 60 struct afs_vnode_param *vp, 61 struct afs_vnode *vnode) 62 { 63 struct afs_file_status *status = &vp->scb.status; 64 struct inode *inode = AFS_VNODE_TO_I(vnode); 65 struct timespec64 t; 66 67 _enter("{%llx:%llu.%u} %s", 68 vp->fid.vid, vp->fid.vnode, vp->fid.unique, 69 op->type ? op->type->name : "???"); 70 71 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", 72 status->type, 73 status->nlink, 74 (unsigned long long) status->size, 75 status->data_version, 76 status->mode); 77 78 write_seqlock(&vnode->cb_lock); 79 80 vnode->cb_v_break = op->cb_v_break; 81 vnode->cb_s_break = op->cb_s_break; 82 vnode->status = *status; 83 84 t = status->mtime_client; 85 inode->i_ctime = t; 86 inode->i_mtime = t; 87 inode->i_atime = t; 88 inode->i_flags |= S_NOATIME; 89 inode->i_uid = make_kuid(&init_user_ns, status->owner); 90 inode->i_gid = make_kgid(&init_user_ns, status->group); 91 set_nlink(&vnode->vfs_inode, status->nlink); 92 93 switch (status->type) { 94 case AFS_FTYPE_FILE: 95 inode->i_mode = S_IFREG | (status->mode & S_IALLUGO); 96 inode->i_op = &afs_file_inode_operations; 97 inode->i_fop = &afs_file_operations; 98 inode->i_mapping->a_ops = &afs_fs_aops; 99 break; 100 case AFS_FTYPE_DIR: 101 inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO); 102 inode->i_op = &afs_dir_inode_operations; 103 inode->i_fop = &afs_dir_file_operations; 104 inode->i_mapping->a_ops = &afs_dir_aops; 105 break; 106 case AFS_FTYPE_SYMLINK: 107 /* Symlinks with a mode of 0644 are actually mountpoints. */ 108 if ((status->mode & 0777) == 0644) { 109 inode->i_flags |= S_AUTOMOUNT; 110 111 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); 112 113 inode->i_mode = S_IFDIR | 0555; 114 inode->i_op = &afs_mntpt_inode_operations; 115 inode->i_fop = &afs_mntpt_file_operations; 116 inode->i_mapping->a_ops = &afs_fs_aops; 117 } else { 118 inode->i_mode = S_IFLNK | status->mode; 119 inode->i_op = &afs_symlink_inode_operations; 120 inode->i_mapping->a_ops = &afs_fs_aops; 121 } 122 inode_nohighmem(inode); 123 break; 124 default: 125 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL); 126 write_sequnlock(&vnode->cb_lock); 127 return afs_protocol_error(NULL, afs_eproto_file_type); 128 } 129 130 afs_set_i_size(vnode, status->size); 131 132 vnode->invalid_before = status->data_version; 133 inode_set_iversion_raw(&vnode->vfs_inode, status->data_version); 134 135 if (!vp->scb.have_cb) { 136 /* it's a symlink we just created (the fileserver 137 * didn't give us a callback) */ 138 vnode->cb_expires_at = ktime_get_real_seconds(); 139 } else { 140 vnode->cb_expires_at = vp->scb.callback.expires_at; 141 vnode->cb_server = op->server; 142 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 143 } 144 145 write_sequnlock(&vnode->cb_lock); 146 return 0; 147 } 148 149 /* 150 * Update the core inode struct from a returned status record. 151 */ 152 static void afs_apply_status(struct afs_operation *op, 153 struct afs_vnode_param *vp) 154 { 155 struct afs_file_status *status = &vp->scb.status; 156 struct afs_vnode *vnode = vp->vnode; 157 struct inode *inode = &vnode->vfs_inode; 158 struct timespec64 t; 159 umode_t mode; 160 bool data_changed = false; 161 bool change_size = vp->set_size; 162 163 _enter("{%llx:%llu.%u} %s", 164 vp->fid.vid, vp->fid.vnode, vp->fid.unique, 165 op->type ? op->type->name : "???"); 166 167 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags)); 168 169 if (status->type != vnode->status.type) { 170 pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n", 171 vnode->fid.vid, 172 vnode->fid.vnode, 173 vnode->fid.unique, 174 status->type, vnode->status.type); 175 afs_protocol_error(NULL, afs_eproto_bad_status); 176 return; 177 } 178 179 if (status->nlink != vnode->status.nlink) 180 set_nlink(inode, status->nlink); 181 182 if (status->owner != vnode->status.owner) 183 inode->i_uid = make_kuid(&init_user_ns, status->owner); 184 185 if (status->group != vnode->status.group) 186 inode->i_gid = make_kgid(&init_user_ns, status->group); 187 188 if (status->mode != vnode->status.mode) { 189 mode = inode->i_mode; 190 mode &= ~S_IALLUGO; 191 mode |= status->mode & S_IALLUGO; 192 WRITE_ONCE(inode->i_mode, mode); 193 } 194 195 t = status->mtime_client; 196 inode->i_mtime = t; 197 if (vp->update_ctime) 198 inode->i_ctime = op->ctime; 199 200 if (vnode->status.data_version != status->data_version) 201 data_changed = true; 202 203 vnode->status = *status; 204 205 if (vp->dv_before + vp->dv_delta != status->data_version) { 206 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) 207 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s (op=%x)\n", 208 vnode->fid.vid, vnode->fid.vnode, 209 (unsigned long long)vp->dv_before + vp->dv_delta, 210 (unsigned long long)status->data_version, 211 op->type ? op->type->name : "???", 212 op->debug_id); 213 214 vnode->invalid_before = status->data_version; 215 if (vnode->status.type == AFS_FTYPE_DIR) { 216 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 217 afs_stat_v(vnode, n_inval); 218 } else { 219 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags); 220 } 221 change_size = true; 222 } else if (vnode->status.type == AFS_FTYPE_DIR) { 223 /* Expected directory change is handled elsewhere so 224 * that we can locally edit the directory and save on a 225 * download. 226 */ 227 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 228 data_changed = false; 229 change_size = true; 230 } 231 232 if (data_changed) { 233 inode_set_iversion_raw(inode, status->data_version); 234 235 /* Only update the size if the data version jumped. If the 236 * file is being modified locally, then we might have our own 237 * idea of what the size should be that's not the same as 238 * what's on the server. 239 */ 240 if (change_size) { 241 afs_set_i_size(vnode, status->size); 242 inode->i_ctime = t; 243 inode->i_atime = t; 244 } 245 } 246 } 247 248 /* 249 * Apply a callback to a vnode. 250 */ 251 static void afs_apply_callback(struct afs_operation *op, 252 struct afs_vnode_param *vp) 253 { 254 struct afs_callback *cb = &vp->scb.callback; 255 struct afs_vnode *vnode = vp->vnode; 256 257 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) { 258 vnode->cb_expires_at = cb->expires_at; 259 vnode->cb_server = op->server; 260 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 261 } 262 } 263 264 /* 265 * Apply the received status and callback to an inode all in the same critical 266 * section to avoid races with afs_validate(). 267 */ 268 void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp) 269 { 270 struct afs_vnode *vnode = vp->vnode; 271 272 _enter(""); 273 274 write_seqlock(&vnode->cb_lock); 275 276 if (vp->scb.have_error) { 277 /* A YFS server will return this from RemoveFile2 and AFS and 278 * YFS will return this from InlineBulkStatus. 279 */ 280 if (vp->scb.status.abort_code == VNOVNODE) { 281 set_bit(AFS_VNODE_DELETED, &vnode->flags); 282 clear_nlink(&vnode->vfs_inode); 283 __afs_break_callback(vnode, afs_cb_break_for_deleted); 284 op->flags &= ~AFS_OPERATION_DIR_CONFLICT; 285 } 286 } else if (vp->scb.have_status) { 287 if (vp->speculative && 288 (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) || 289 vp->dv_before != vnode->status.data_version)) 290 /* Ignore the result of a speculative bulk status fetch 291 * if it splits around a modification op, thereby 292 * appearing to regress the data version. 293 */ 294 goto out; 295 afs_apply_status(op, vp); 296 if (vp->scb.have_cb) 297 afs_apply_callback(op, vp); 298 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) { 299 drop_nlink(&vnode->vfs_inode); 300 if (vnode->vfs_inode.i_nlink == 0) { 301 set_bit(AFS_VNODE_DELETED, &vnode->flags); 302 __afs_break_callback(vnode, afs_cb_break_for_deleted); 303 } 304 } 305 306 out: 307 write_sequnlock(&vnode->cb_lock); 308 309 if (vp->scb.have_status) 310 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 311 } 312 313 static void afs_fetch_status_success(struct afs_operation *op) 314 { 315 struct afs_vnode_param *vp = &op->file[op->fetch_status.which]; 316 struct afs_vnode *vnode = vp->vnode; 317 int ret; 318 319 if (vnode->vfs_inode.i_state & I_NEW) { 320 ret = afs_inode_init_from_status(op, vp, vnode); 321 op->error = ret; 322 if (ret == 0) 323 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 324 } else { 325 afs_vnode_commit_status(op, vp); 326 } 327 } 328 329 const struct afs_operation_ops afs_fetch_status_operation = { 330 .issue_afs_rpc = afs_fs_fetch_status, 331 .issue_yfs_rpc = yfs_fs_fetch_status, 332 .success = afs_fetch_status_success, 333 .aborted = afs_check_for_remote_deletion, 334 }; 335 336 /* 337 * Fetch file status from the volume. 338 */ 339 int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new, 340 afs_access_t *_caller_access) 341 { 342 struct afs_operation *op; 343 344 _enter("%s,{%llx:%llu.%u,S=%lx}", 345 vnode->volume->name, 346 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, 347 vnode->flags); 348 349 op = afs_alloc_operation(key, vnode->volume); 350 if (IS_ERR(op)) 351 return PTR_ERR(op); 352 353 afs_op_set_vnode(op, 0, vnode); 354 355 op->nr_files = 1; 356 op->ops = &afs_fetch_status_operation; 357 afs_begin_vnode_operation(op); 358 afs_wait_for_operation(op); 359 360 if (_caller_access) 361 *_caller_access = op->file[0].scb.status.caller_access; 362 return afs_put_operation(op); 363 } 364 365 /* 366 * ilookup() comparator 367 */ 368 int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque) 369 { 370 struct afs_vnode *vnode = AFS_FS_I(inode); 371 struct afs_fid *fid = opaque; 372 373 return (fid->vnode == vnode->fid.vnode && 374 fid->vnode_hi == vnode->fid.vnode_hi && 375 fid->unique == vnode->fid.unique); 376 } 377 378 /* 379 * iget5() comparator 380 */ 381 static int afs_iget5_test(struct inode *inode, void *opaque) 382 { 383 struct afs_vnode_param *vp = opaque; 384 //struct afs_vnode *vnode = AFS_FS_I(inode); 385 386 return afs_ilookup5_test_by_fid(inode, &vp->fid); 387 } 388 389 /* 390 * iget5() inode initialiser 391 */ 392 static int afs_iget5_set(struct inode *inode, void *opaque) 393 { 394 struct afs_vnode_param *vp = opaque; 395 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 396 struct afs_vnode *vnode = AFS_FS_I(inode); 397 398 vnode->volume = as->volume; 399 vnode->fid = vp->fid; 400 401 /* YFS supports 96-bit vnode IDs, but Linux only supports 402 * 64-bit inode numbers. 403 */ 404 inode->i_ino = vnode->fid.vnode; 405 inode->i_generation = vnode->fid.unique; 406 return 0; 407 } 408 409 /* 410 * Get a cache cookie for an inode. 411 */ 412 static void afs_get_inode_cache(struct afs_vnode *vnode) 413 { 414 #ifdef CONFIG_AFS_FSCACHE 415 struct { 416 u32 vnode_id; 417 u32 unique; 418 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */ 419 } __packed key; 420 struct afs_vnode_cache_aux aux; 421 422 if (vnode->status.type != AFS_FTYPE_FILE) { 423 vnode->cache = NULL; 424 return; 425 } 426 427 key.vnode_id = vnode->fid.vnode; 428 key.unique = vnode->fid.unique; 429 key.vnode_id_ext[0] = vnode->fid.vnode >> 32; 430 key.vnode_id_ext[1] = vnode->fid.vnode_hi; 431 aux.data_version = vnode->status.data_version; 432 433 vnode->cache = fscache_acquire_cookie(vnode->volume->cache, 434 &afs_vnode_cache_index_def, 435 &key, sizeof(key), 436 &aux, sizeof(aux), 437 vnode, vnode->status.size, true); 438 #endif 439 } 440 441 /* 442 * inode retrieval 443 */ 444 struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp) 445 { 446 struct afs_vnode_param *dvp = &op->file[0]; 447 struct super_block *sb = dvp->vnode->vfs_inode.i_sb; 448 struct afs_vnode *vnode; 449 struct inode *inode; 450 int ret; 451 452 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique); 453 454 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp); 455 if (!inode) { 456 _leave(" = -ENOMEM"); 457 return ERR_PTR(-ENOMEM); 458 } 459 460 vnode = AFS_FS_I(inode); 461 462 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", 463 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); 464 465 /* deal with an existing inode */ 466 if (!(inode->i_state & I_NEW)) { 467 _leave(" = %p", inode); 468 return inode; 469 } 470 471 ret = afs_inode_init_from_status(op, vp, vnode); 472 if (ret < 0) 473 goto bad_inode; 474 475 afs_get_inode_cache(vnode); 476 477 /* success */ 478 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 479 unlock_new_inode(inode); 480 _leave(" = %p", inode); 481 return inode; 482 483 /* failure */ 484 bad_inode: 485 iget_failed(inode); 486 _leave(" = %d [bad]", ret); 487 return ERR_PTR(ret); 488 } 489 490 static int afs_iget5_set_root(struct inode *inode, void *opaque) 491 { 492 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 493 struct afs_vnode *vnode = AFS_FS_I(inode); 494 495 vnode->volume = as->volume; 496 vnode->fid.vid = as->volume->vid, 497 vnode->fid.vnode = 1; 498 vnode->fid.unique = 1; 499 inode->i_ino = 1; 500 inode->i_generation = 1; 501 return 0; 502 } 503 504 /* 505 * Set up the root inode for a volume. This is always vnode 1, unique 1 within 506 * the volume. 507 */ 508 struct inode *afs_root_iget(struct super_block *sb, struct key *key) 509 { 510 struct afs_super_info *as = AFS_FS_S(sb); 511 struct afs_operation *op; 512 struct afs_vnode *vnode; 513 struct inode *inode; 514 int ret; 515 516 _enter(",{%llx},,", as->volume->vid); 517 518 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL); 519 if (!inode) { 520 _leave(" = -ENOMEM"); 521 return ERR_PTR(-ENOMEM); 522 } 523 524 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid); 525 526 BUG_ON(!(inode->i_state & I_NEW)); 527 528 vnode = AFS_FS_I(inode); 529 vnode->cb_v_break = as->volume->cb_v_break, 530 531 op = afs_alloc_operation(key, as->volume); 532 if (IS_ERR(op)) { 533 ret = PTR_ERR(op); 534 goto error; 535 } 536 537 afs_op_set_vnode(op, 0, vnode); 538 539 op->nr_files = 1; 540 op->ops = &afs_fetch_status_operation; 541 ret = afs_do_sync_operation(op); 542 if (ret < 0) 543 goto error; 544 545 afs_get_inode_cache(vnode); 546 547 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 548 unlock_new_inode(inode); 549 _leave(" = %p", inode); 550 return inode; 551 552 error: 553 iget_failed(inode); 554 _leave(" = %d [bad]", ret); 555 return ERR_PTR(ret); 556 } 557 558 /* 559 * mark the data attached to an inode as obsolete due to a write on the server 560 * - might also want to ditch all the outstanding writes and dirty pages 561 */ 562 static void afs_zap_data(struct afs_vnode *vnode) 563 { 564 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); 565 566 #ifdef CONFIG_AFS_FSCACHE 567 fscache_invalidate(vnode->cache); 568 #endif 569 570 /* nuke all the non-dirty pages that aren't locked, mapped or being 571 * written back in a regular file and completely discard the pages in a 572 * directory or symlink */ 573 if (S_ISREG(vnode->vfs_inode.i_mode)) 574 invalidate_remote_inode(&vnode->vfs_inode); 575 else 576 invalidate_inode_pages2(vnode->vfs_inode.i_mapping); 577 } 578 579 /* 580 * Check to see if we have a server currently serving this volume and that it 581 * hasn't been reinitialised or dropped from the list. 582 */ 583 static bool afs_check_server_good(struct afs_vnode *vnode) 584 { 585 struct afs_server_list *slist; 586 struct afs_server *server; 587 bool good; 588 int i; 589 590 if (vnode->cb_fs_s_break == atomic_read(&vnode->volume->cell->fs_s_break)) 591 return true; 592 593 rcu_read_lock(); 594 595 slist = rcu_dereference(vnode->volume->servers); 596 for (i = 0; i < slist->nr_servers; i++) { 597 server = slist->servers[i].server; 598 if (server == vnode->cb_server) { 599 good = (vnode->cb_s_break == server->cb_s_break); 600 rcu_read_unlock(); 601 return good; 602 } 603 } 604 605 rcu_read_unlock(); 606 return false; 607 } 608 609 /* 610 * Check the validity of a vnode/inode. 611 */ 612 bool afs_check_validity(struct afs_vnode *vnode) 613 { 614 enum afs_cb_break_reason need_clear = afs_cb_break_no_break; 615 time64_t now = ktime_get_real_seconds(); 616 unsigned int cb_break; 617 int seq = 0; 618 619 do { 620 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 621 cb_break = vnode->cb_break; 622 623 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 624 if (vnode->cb_v_break != vnode->volume->cb_v_break) 625 need_clear = afs_cb_break_for_v_break; 626 else if (!afs_check_server_good(vnode)) 627 need_clear = afs_cb_break_for_s_reinit; 628 else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 629 need_clear = afs_cb_break_for_zap; 630 else if (vnode->cb_expires_at - 10 <= now) 631 need_clear = afs_cb_break_for_lapsed; 632 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 633 ; 634 } else { 635 need_clear = afs_cb_break_no_promise; 636 } 637 638 } while (need_seqretry(&vnode->cb_lock, seq)); 639 640 done_seqretry(&vnode->cb_lock, seq); 641 642 if (need_clear == afs_cb_break_no_break) 643 return true; 644 645 write_seqlock(&vnode->cb_lock); 646 if (need_clear == afs_cb_break_no_promise) 647 vnode->cb_v_break = vnode->volume->cb_v_break; 648 else if (cb_break == vnode->cb_break) 649 __afs_break_callback(vnode, need_clear); 650 else 651 trace_afs_cb_miss(&vnode->fid, need_clear); 652 write_sequnlock(&vnode->cb_lock); 653 return false; 654 } 655 656 /* 657 * validate a vnode/inode 658 * - there are several things we need to check 659 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, 660 * symlink) 661 * - parent dir metadata changed (security changes) 662 * - dentry data changed (write, truncate) 663 * - dentry metadata changed (security changes) 664 */ 665 int afs_validate(struct afs_vnode *vnode, struct key *key) 666 { 667 int ret; 668 669 _enter("{v={%llx:%llu} fl=%lx},%x", 670 vnode->fid.vid, vnode->fid.vnode, vnode->flags, 671 key_serial(key)); 672 673 if (unlikely(test_bit(AFS_VNODE_DELETED, &vnode->flags))) { 674 if (vnode->vfs_inode.i_nlink) 675 clear_nlink(&vnode->vfs_inode); 676 goto valid; 677 } 678 679 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && 680 afs_check_validity(vnode)) 681 goto valid; 682 683 down_write(&vnode->validate_lock); 684 685 /* if the promise has expired, we need to check the server again to get 686 * a new promise - note that if the (parent) directory's metadata was 687 * changed then the security may be different and we may no longer have 688 * access */ 689 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 690 _debug("not promised"); 691 ret = afs_fetch_status(vnode, key, false, NULL); 692 if (ret < 0) { 693 if (ret == -ENOENT) { 694 set_bit(AFS_VNODE_DELETED, &vnode->flags); 695 ret = -ESTALE; 696 } 697 goto error_unlock; 698 } 699 _debug("new promise [fl=%lx]", vnode->flags); 700 } 701 702 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 703 _debug("file already deleted"); 704 ret = -ESTALE; 705 goto error_unlock; 706 } 707 708 /* if the vnode's data version number changed then its contents are 709 * different */ 710 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 711 afs_zap_data(vnode); 712 up_write(&vnode->validate_lock); 713 valid: 714 _leave(" = 0"); 715 return 0; 716 717 error_unlock: 718 up_write(&vnode->validate_lock); 719 _leave(" = %d", ret); 720 return ret; 721 } 722 723 /* 724 * read the attributes of an inode 725 */ 726 int afs_getattr(struct user_namespace *mnt_userns, const struct path *path, 727 struct kstat *stat, u32 request_mask, unsigned int query_flags) 728 { 729 struct inode *inode = d_inode(path->dentry); 730 struct afs_vnode *vnode = AFS_FS_I(inode); 731 int seq = 0; 732 733 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); 734 735 do { 736 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 737 generic_fillattr(&init_user_ns, inode, stat); 738 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) && 739 stat->nlink > 0) 740 stat->nlink -= 1; 741 } while (need_seqretry(&vnode->cb_lock, seq)); 742 743 done_seqretry(&vnode->cb_lock, seq); 744 return 0; 745 } 746 747 /* 748 * discard an AFS inode 749 */ 750 int afs_drop_inode(struct inode *inode) 751 { 752 _enter(""); 753 754 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) 755 return generic_delete_inode(inode); 756 else 757 return generic_drop_inode(inode); 758 } 759 760 /* 761 * clear an AFS inode 762 */ 763 void afs_evict_inode(struct inode *inode) 764 { 765 struct afs_vnode *vnode; 766 767 vnode = AFS_FS_I(inode); 768 769 _enter("{%llx:%llu.%d}", 770 vnode->fid.vid, 771 vnode->fid.vnode, 772 vnode->fid.unique); 773 774 _debug("CLEAR INODE %p", inode); 775 776 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); 777 778 truncate_inode_pages_final(&inode->i_data); 779 clear_inode(inode); 780 781 while (!list_empty(&vnode->wb_keys)) { 782 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, 783 struct afs_wb_key, vnode_link); 784 list_del(&wbk->vnode_link); 785 afs_put_wb_key(wbk); 786 } 787 788 #ifdef CONFIG_AFS_FSCACHE 789 { 790 struct afs_vnode_cache_aux aux; 791 792 aux.data_version = vnode->status.data_version; 793 fscache_relinquish_cookie(vnode->cache, &aux, 794 test_bit(AFS_VNODE_DELETED, &vnode->flags)); 795 vnode->cache = NULL; 796 } 797 #endif 798 799 afs_prune_wb_keys(vnode); 800 afs_put_permits(rcu_access_pointer(vnode->permit_cache)); 801 key_put(vnode->silly_key); 802 vnode->silly_key = NULL; 803 key_put(vnode->lock_key); 804 vnode->lock_key = NULL; 805 _leave(""); 806 } 807 808 static void afs_setattr_success(struct afs_operation *op) 809 { 810 struct afs_vnode_param *vp = &op->file[0]; 811 struct inode *inode = &vp->vnode->vfs_inode; 812 loff_t old_i_size = i_size_read(inode); 813 814 op->setattr.old_i_size = old_i_size; 815 afs_vnode_commit_status(op, vp); 816 /* inode->i_size has now been changed. */ 817 818 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 819 loff_t size = op->setattr.attr->ia_size; 820 if (size > old_i_size) 821 pagecache_isize_extended(inode, old_i_size, size); 822 } 823 } 824 825 static void afs_setattr_edit_file(struct afs_operation *op) 826 { 827 struct afs_vnode_param *vp = &op->file[0]; 828 struct inode *inode = &vp->vnode->vfs_inode; 829 830 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 831 loff_t size = op->setattr.attr->ia_size; 832 loff_t i_size = op->setattr.old_i_size; 833 834 if (size < i_size) 835 truncate_pagecache(inode, size); 836 } 837 } 838 839 static const struct afs_operation_ops afs_setattr_operation = { 840 .issue_afs_rpc = afs_fs_setattr, 841 .issue_yfs_rpc = yfs_fs_setattr, 842 .success = afs_setattr_success, 843 .edit_dir = afs_setattr_edit_file, 844 }; 845 846 /* 847 * set the attributes of an inode 848 */ 849 int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, 850 struct iattr *attr) 851 { 852 struct afs_operation *op; 853 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 854 int ret; 855 856 _enter("{%llx:%llu},{n=%pd},%x", 857 vnode->fid.vid, vnode->fid.vnode, dentry, 858 attr->ia_valid); 859 860 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | 861 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | 862 ATTR_TOUCH))) { 863 _leave(" = 0 [unsupported]"); 864 return 0; 865 } 866 867 if (attr->ia_valid & ATTR_SIZE) { 868 if (!S_ISREG(vnode->vfs_inode.i_mode)) 869 return -EISDIR; 870 871 ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size); 872 if (ret) 873 return ret; 874 875 if (attr->ia_size == i_size_read(&vnode->vfs_inode)) 876 attr->ia_valid &= ~ATTR_SIZE; 877 } 878 879 /* flush any dirty data outstanding on a regular file */ 880 if (S_ISREG(vnode->vfs_inode.i_mode)) 881 filemap_write_and_wait(vnode->vfs_inode.i_mapping); 882 883 /* Prevent any new writebacks from starting whilst we do this. */ 884 down_write(&vnode->validate_lock); 885 886 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? 887 afs_file_key(attr->ia_file) : NULL), 888 vnode->volume); 889 if (IS_ERR(op)) { 890 ret = PTR_ERR(op); 891 goto out_unlock; 892 } 893 894 afs_op_set_vnode(op, 0, vnode); 895 op->setattr.attr = attr; 896 897 if (attr->ia_valid & ATTR_SIZE) { 898 op->file[0].dv_delta = 1; 899 op->file[0].set_size = true; 900 } 901 op->ctime = attr->ia_ctime; 902 op->file[0].update_ctime = 1; 903 op->file[0].modification = true; 904 905 op->ops = &afs_setattr_operation; 906 ret = afs_do_sync_operation(op); 907 908 out_unlock: 909 up_write(&vnode->validate_lock); 910 _leave(" = %d", ret); 911 return ret; 912 } 913