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 * Set parameters for the netfs library 58 */ 59 static void afs_set_netfs_context(struct afs_vnode *vnode) 60 { 61 netfs_inode_init(&vnode->netfs, &afs_req_ops); 62 } 63 64 /* 65 * Initialise an inode from the vnode status. 66 */ 67 static int afs_inode_init_from_status(struct afs_operation *op, 68 struct afs_vnode_param *vp, 69 struct afs_vnode *vnode) 70 { 71 struct afs_file_status *status = &vp->scb.status; 72 struct inode *inode = AFS_VNODE_TO_I(vnode); 73 struct timespec64 t; 74 75 _enter("{%llx:%llu.%u} %s", 76 vp->fid.vid, vp->fid.vnode, vp->fid.unique, 77 op->type ? op->type->name : "???"); 78 79 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", 80 status->type, 81 status->nlink, 82 (unsigned long long) status->size, 83 status->data_version, 84 status->mode); 85 86 write_seqlock(&vnode->cb_lock); 87 88 vnode->cb_v_break = op->cb_v_break; 89 vnode->cb_s_break = op->cb_s_break; 90 vnode->status = *status; 91 92 t = status->mtime_client; 93 inode->i_ctime = t; 94 inode->i_mtime = t; 95 inode->i_atime = t; 96 inode->i_flags |= S_NOATIME; 97 inode->i_uid = make_kuid(&init_user_ns, status->owner); 98 inode->i_gid = make_kgid(&init_user_ns, status->group); 99 set_nlink(&vnode->netfs.inode, status->nlink); 100 101 switch (status->type) { 102 case AFS_FTYPE_FILE: 103 inode->i_mode = S_IFREG | (status->mode & S_IALLUGO); 104 inode->i_op = &afs_file_inode_operations; 105 inode->i_fop = &afs_file_operations; 106 inode->i_mapping->a_ops = &afs_file_aops; 107 mapping_set_large_folios(inode->i_mapping); 108 break; 109 case AFS_FTYPE_DIR: 110 inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO); 111 inode->i_op = &afs_dir_inode_operations; 112 inode->i_fop = &afs_dir_file_operations; 113 inode->i_mapping->a_ops = &afs_dir_aops; 114 mapping_set_large_folios(inode->i_mapping); 115 break; 116 case AFS_FTYPE_SYMLINK: 117 /* Symlinks with a mode of 0644 are actually mountpoints. */ 118 if ((status->mode & 0777) == 0644) { 119 inode->i_flags |= S_AUTOMOUNT; 120 121 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); 122 123 inode->i_mode = S_IFDIR | 0555; 124 inode->i_op = &afs_mntpt_inode_operations; 125 inode->i_fop = &afs_mntpt_file_operations; 126 inode->i_mapping->a_ops = &afs_symlink_aops; 127 } else { 128 inode->i_mode = S_IFLNK | status->mode; 129 inode->i_op = &afs_symlink_inode_operations; 130 inode->i_mapping->a_ops = &afs_symlink_aops; 131 } 132 inode_nohighmem(inode); 133 break; 134 default: 135 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL); 136 write_sequnlock(&vnode->cb_lock); 137 return afs_protocol_error(NULL, afs_eproto_file_type); 138 } 139 140 afs_set_i_size(vnode, status->size); 141 afs_set_netfs_context(vnode); 142 143 vnode->invalid_before = status->data_version; 144 inode_set_iversion_raw(&vnode->netfs.inode, status->data_version); 145 146 if (!vp->scb.have_cb) { 147 /* it's a symlink we just created (the fileserver 148 * didn't give us a callback) */ 149 vnode->cb_expires_at = ktime_get_real_seconds(); 150 } else { 151 vnode->cb_expires_at = vp->scb.callback.expires_at; 152 vnode->cb_server = op->server; 153 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 154 } 155 156 write_sequnlock(&vnode->cb_lock); 157 return 0; 158 } 159 160 /* 161 * Update the core inode struct from a returned status record. 162 */ 163 static void afs_apply_status(struct afs_operation *op, 164 struct afs_vnode_param *vp) 165 { 166 struct afs_file_status *status = &vp->scb.status; 167 struct afs_vnode *vnode = vp->vnode; 168 struct inode *inode = &vnode->netfs.inode; 169 struct timespec64 t; 170 umode_t mode; 171 bool data_changed = false; 172 bool change_size = vp->set_size; 173 174 _enter("{%llx:%llu.%u} %s", 175 vp->fid.vid, vp->fid.vnode, vp->fid.unique, 176 op->type ? op->type->name : "???"); 177 178 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags)); 179 180 if (status->type != vnode->status.type) { 181 pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n", 182 vnode->fid.vid, 183 vnode->fid.vnode, 184 vnode->fid.unique, 185 status->type, vnode->status.type); 186 afs_protocol_error(NULL, afs_eproto_bad_status); 187 return; 188 } 189 190 if (status->nlink != vnode->status.nlink) 191 set_nlink(inode, status->nlink); 192 193 if (status->owner != vnode->status.owner) 194 inode->i_uid = make_kuid(&init_user_ns, status->owner); 195 196 if (status->group != vnode->status.group) 197 inode->i_gid = make_kgid(&init_user_ns, status->group); 198 199 if (status->mode != vnode->status.mode) { 200 mode = inode->i_mode; 201 mode &= ~S_IALLUGO; 202 mode |= status->mode & S_IALLUGO; 203 WRITE_ONCE(inode->i_mode, mode); 204 } 205 206 t = status->mtime_client; 207 inode->i_mtime = t; 208 if (vp->update_ctime) 209 inode->i_ctime = op->ctime; 210 211 if (vnode->status.data_version != status->data_version) 212 data_changed = true; 213 214 vnode->status = *status; 215 216 if (vp->dv_before + vp->dv_delta != status->data_version) { 217 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) 218 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s (op=%x)\n", 219 vnode->fid.vid, vnode->fid.vnode, 220 (unsigned long long)vp->dv_before + vp->dv_delta, 221 (unsigned long long)status->data_version, 222 op->type ? op->type->name : "???", 223 op->debug_id); 224 225 vnode->invalid_before = status->data_version; 226 if (vnode->status.type == AFS_FTYPE_DIR) { 227 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 228 afs_stat_v(vnode, n_inval); 229 } else { 230 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags); 231 } 232 change_size = true; 233 } else if (vnode->status.type == AFS_FTYPE_DIR) { 234 /* Expected directory change is handled elsewhere so 235 * that we can locally edit the directory and save on a 236 * download. 237 */ 238 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 239 data_changed = false; 240 change_size = true; 241 } 242 243 if (data_changed) { 244 inode_set_iversion_raw(inode, status->data_version); 245 246 /* Only update the size if the data version jumped. If the 247 * file is being modified locally, then we might have our own 248 * idea of what the size should be that's not the same as 249 * what's on the server. 250 */ 251 vnode->netfs.remote_i_size = status->size; 252 if (change_size) { 253 afs_set_i_size(vnode, status->size); 254 inode->i_ctime = t; 255 inode->i_atime = t; 256 } 257 } 258 } 259 260 /* 261 * Apply a callback to a vnode. 262 */ 263 static void afs_apply_callback(struct afs_operation *op, 264 struct afs_vnode_param *vp) 265 { 266 struct afs_callback *cb = &vp->scb.callback; 267 struct afs_vnode *vnode = vp->vnode; 268 269 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) { 270 vnode->cb_expires_at = cb->expires_at; 271 vnode->cb_server = op->server; 272 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 273 } 274 } 275 276 /* 277 * Apply the received status and callback to an inode all in the same critical 278 * section to avoid races with afs_validate(). 279 */ 280 void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp) 281 { 282 struct afs_vnode *vnode = vp->vnode; 283 284 _enter(""); 285 286 write_seqlock(&vnode->cb_lock); 287 288 if (vp->scb.have_error) { 289 /* A YFS server will return this from RemoveFile2 and AFS and 290 * YFS will return this from InlineBulkStatus. 291 */ 292 if (vp->scb.status.abort_code == VNOVNODE) { 293 set_bit(AFS_VNODE_DELETED, &vnode->flags); 294 clear_nlink(&vnode->netfs.inode); 295 __afs_break_callback(vnode, afs_cb_break_for_deleted); 296 op->flags &= ~AFS_OPERATION_DIR_CONFLICT; 297 } 298 } else if (vp->scb.have_status) { 299 if (vp->speculative && 300 (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) || 301 vp->dv_before != vnode->status.data_version)) 302 /* Ignore the result of a speculative bulk status fetch 303 * if it splits around a modification op, thereby 304 * appearing to regress the data version. 305 */ 306 goto out; 307 afs_apply_status(op, vp); 308 if (vp->scb.have_cb) 309 afs_apply_callback(op, vp); 310 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) { 311 drop_nlink(&vnode->netfs.inode); 312 if (vnode->netfs.inode.i_nlink == 0) { 313 set_bit(AFS_VNODE_DELETED, &vnode->flags); 314 __afs_break_callback(vnode, afs_cb_break_for_deleted); 315 } 316 } 317 318 out: 319 write_sequnlock(&vnode->cb_lock); 320 321 if (vp->scb.have_status) 322 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 323 } 324 325 static void afs_fetch_status_success(struct afs_operation *op) 326 { 327 struct afs_vnode_param *vp = &op->file[op->fetch_status.which]; 328 struct afs_vnode *vnode = vp->vnode; 329 int ret; 330 331 if (vnode->netfs.inode.i_state & I_NEW) { 332 ret = afs_inode_init_from_status(op, vp, vnode); 333 op->error = ret; 334 if (ret == 0) 335 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 336 } else { 337 afs_vnode_commit_status(op, vp); 338 } 339 } 340 341 const struct afs_operation_ops afs_fetch_status_operation = { 342 .issue_afs_rpc = afs_fs_fetch_status, 343 .issue_yfs_rpc = yfs_fs_fetch_status, 344 .success = afs_fetch_status_success, 345 .aborted = afs_check_for_remote_deletion, 346 }; 347 348 /* 349 * Fetch file status from the volume. 350 */ 351 int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new, 352 afs_access_t *_caller_access) 353 { 354 struct afs_operation *op; 355 356 _enter("%s,{%llx:%llu.%u,S=%lx}", 357 vnode->volume->name, 358 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, 359 vnode->flags); 360 361 op = afs_alloc_operation(key, vnode->volume); 362 if (IS_ERR(op)) 363 return PTR_ERR(op); 364 365 afs_op_set_vnode(op, 0, vnode); 366 367 op->nr_files = 1; 368 op->ops = &afs_fetch_status_operation; 369 afs_begin_vnode_operation(op); 370 afs_wait_for_operation(op); 371 372 if (_caller_access) 373 *_caller_access = op->file[0].scb.status.caller_access; 374 return afs_put_operation(op); 375 } 376 377 /* 378 * ilookup() comparator 379 */ 380 int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque) 381 { 382 struct afs_vnode *vnode = AFS_FS_I(inode); 383 struct afs_fid *fid = opaque; 384 385 return (fid->vnode == vnode->fid.vnode && 386 fid->vnode_hi == vnode->fid.vnode_hi && 387 fid->unique == vnode->fid.unique); 388 } 389 390 /* 391 * iget5() comparator 392 */ 393 static int afs_iget5_test(struct inode *inode, void *opaque) 394 { 395 struct afs_vnode_param *vp = opaque; 396 //struct afs_vnode *vnode = AFS_FS_I(inode); 397 398 return afs_ilookup5_test_by_fid(inode, &vp->fid); 399 } 400 401 /* 402 * iget5() inode initialiser 403 */ 404 static int afs_iget5_set(struct inode *inode, void *opaque) 405 { 406 struct afs_vnode_param *vp = opaque; 407 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 408 struct afs_vnode *vnode = AFS_FS_I(inode); 409 410 vnode->volume = as->volume; 411 vnode->fid = vp->fid; 412 413 /* YFS supports 96-bit vnode IDs, but Linux only supports 414 * 64-bit inode numbers. 415 */ 416 inode->i_ino = vnode->fid.vnode; 417 inode->i_generation = vnode->fid.unique; 418 return 0; 419 } 420 421 /* 422 * Get a cache cookie for an inode. 423 */ 424 static void afs_get_inode_cache(struct afs_vnode *vnode) 425 { 426 #ifdef CONFIG_AFS_FSCACHE 427 struct { 428 __be32 vnode_id; 429 __be32 unique; 430 __be32 vnode_id_ext[2]; /* Allow for a 96-bit key */ 431 } __packed key; 432 struct afs_vnode_cache_aux aux; 433 434 if (vnode->status.type != AFS_FTYPE_FILE) { 435 vnode->netfs.cache = NULL; 436 return; 437 } 438 439 key.vnode_id = htonl(vnode->fid.vnode); 440 key.unique = htonl(vnode->fid.unique); 441 key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32); 442 key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi); 443 afs_set_cache_aux(vnode, &aux); 444 445 afs_vnode_set_cache(vnode, 446 fscache_acquire_cookie( 447 vnode->volume->cache, 448 vnode->status.type == AFS_FTYPE_FILE ? 449 0 : FSCACHE_ADV_SINGLE_CHUNK, 450 &key, sizeof(key), 451 &aux, sizeof(aux), 452 vnode->status.size)); 453 #endif 454 } 455 456 /* 457 * inode retrieval 458 */ 459 struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp) 460 { 461 struct afs_vnode_param *dvp = &op->file[0]; 462 struct super_block *sb = dvp->vnode->netfs.inode.i_sb; 463 struct afs_vnode *vnode; 464 struct inode *inode; 465 int ret; 466 467 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique); 468 469 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp); 470 if (!inode) { 471 _leave(" = -ENOMEM"); 472 return ERR_PTR(-ENOMEM); 473 } 474 475 vnode = AFS_FS_I(inode); 476 477 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", 478 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); 479 480 /* deal with an existing inode */ 481 if (!(inode->i_state & I_NEW)) { 482 _leave(" = %p", inode); 483 return inode; 484 } 485 486 ret = afs_inode_init_from_status(op, vp, vnode); 487 if (ret < 0) 488 goto bad_inode; 489 490 afs_get_inode_cache(vnode); 491 492 /* success */ 493 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 494 unlock_new_inode(inode); 495 _leave(" = %p", inode); 496 return inode; 497 498 /* failure */ 499 bad_inode: 500 iget_failed(inode); 501 _leave(" = %d [bad]", ret); 502 return ERR_PTR(ret); 503 } 504 505 static int afs_iget5_set_root(struct inode *inode, void *opaque) 506 { 507 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 508 struct afs_vnode *vnode = AFS_FS_I(inode); 509 510 vnode->volume = as->volume; 511 vnode->fid.vid = as->volume->vid, 512 vnode->fid.vnode = 1; 513 vnode->fid.unique = 1; 514 inode->i_ino = 1; 515 inode->i_generation = 1; 516 return 0; 517 } 518 519 /* 520 * Set up the root inode for a volume. This is always vnode 1, unique 1 within 521 * the volume. 522 */ 523 struct inode *afs_root_iget(struct super_block *sb, struct key *key) 524 { 525 struct afs_super_info *as = AFS_FS_S(sb); 526 struct afs_operation *op; 527 struct afs_vnode *vnode; 528 struct inode *inode; 529 int ret; 530 531 _enter(",{%llx},,", as->volume->vid); 532 533 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL); 534 if (!inode) { 535 _leave(" = -ENOMEM"); 536 return ERR_PTR(-ENOMEM); 537 } 538 539 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid); 540 541 BUG_ON(!(inode->i_state & I_NEW)); 542 543 vnode = AFS_FS_I(inode); 544 vnode->cb_v_break = as->volume->cb_v_break, 545 afs_set_netfs_context(vnode); 546 547 op = afs_alloc_operation(key, as->volume); 548 if (IS_ERR(op)) { 549 ret = PTR_ERR(op); 550 goto error; 551 } 552 553 afs_op_set_vnode(op, 0, vnode); 554 555 op->nr_files = 1; 556 op->ops = &afs_fetch_status_operation; 557 ret = afs_do_sync_operation(op); 558 if (ret < 0) 559 goto error; 560 561 afs_get_inode_cache(vnode); 562 563 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 564 unlock_new_inode(inode); 565 _leave(" = %p", inode); 566 return inode; 567 568 error: 569 iget_failed(inode); 570 _leave(" = %d [bad]", ret); 571 return ERR_PTR(ret); 572 } 573 574 /* 575 * mark the data attached to an inode as obsolete due to a write on the server 576 * - might also want to ditch all the outstanding writes and dirty pages 577 */ 578 static void afs_zap_data(struct afs_vnode *vnode) 579 { 580 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); 581 582 afs_invalidate_cache(vnode, 0); 583 584 /* nuke all the non-dirty pages that aren't locked, mapped or being 585 * written back in a regular file and completely discard the pages in a 586 * directory or symlink */ 587 if (S_ISREG(vnode->netfs.inode.i_mode)) 588 invalidate_remote_inode(&vnode->netfs.inode); 589 else 590 invalidate_inode_pages2(vnode->netfs.inode.i_mapping); 591 } 592 593 /* 594 * Check to see if we have a server currently serving this volume and that it 595 * hasn't been reinitialised or dropped from the list. 596 */ 597 static bool afs_check_server_good(struct afs_vnode *vnode) 598 { 599 struct afs_server_list *slist; 600 struct afs_server *server; 601 bool good; 602 int i; 603 604 if (vnode->cb_fs_s_break == atomic_read(&vnode->volume->cell->fs_s_break)) 605 return true; 606 607 rcu_read_lock(); 608 609 slist = rcu_dereference(vnode->volume->servers); 610 for (i = 0; i < slist->nr_servers; i++) { 611 server = slist->servers[i].server; 612 if (server == vnode->cb_server) { 613 good = (vnode->cb_s_break == server->cb_s_break); 614 rcu_read_unlock(); 615 return good; 616 } 617 } 618 619 rcu_read_unlock(); 620 return false; 621 } 622 623 /* 624 * Check the validity of a vnode/inode. 625 */ 626 bool afs_check_validity(struct afs_vnode *vnode) 627 { 628 enum afs_cb_break_reason need_clear = afs_cb_break_no_break; 629 time64_t now = ktime_get_real_seconds(); 630 unsigned int cb_break; 631 int seq = 0; 632 633 do { 634 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 635 cb_break = vnode->cb_break; 636 637 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 638 if (vnode->cb_v_break != vnode->volume->cb_v_break) 639 need_clear = afs_cb_break_for_v_break; 640 else if (!afs_check_server_good(vnode)) 641 need_clear = afs_cb_break_for_s_reinit; 642 else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 643 need_clear = afs_cb_break_for_zap; 644 else if (vnode->cb_expires_at - 10 <= now) 645 need_clear = afs_cb_break_for_lapsed; 646 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 647 ; 648 } else { 649 need_clear = afs_cb_break_no_promise; 650 } 651 652 } while (need_seqretry(&vnode->cb_lock, seq)); 653 654 done_seqretry(&vnode->cb_lock, seq); 655 656 if (need_clear == afs_cb_break_no_break) 657 return true; 658 659 write_seqlock(&vnode->cb_lock); 660 if (need_clear == afs_cb_break_no_promise) 661 vnode->cb_v_break = vnode->volume->cb_v_break; 662 else if (cb_break == vnode->cb_break) 663 __afs_break_callback(vnode, need_clear); 664 else 665 trace_afs_cb_miss(&vnode->fid, need_clear); 666 write_sequnlock(&vnode->cb_lock); 667 return false; 668 } 669 670 /* 671 * Returns true if the pagecache is still valid. Does not sleep. 672 */ 673 bool afs_pagecache_valid(struct afs_vnode *vnode) 674 { 675 if (unlikely(test_bit(AFS_VNODE_DELETED, &vnode->flags))) { 676 if (vnode->netfs.inode.i_nlink) 677 clear_nlink(&vnode->netfs.inode); 678 return true; 679 } 680 681 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && 682 afs_check_validity(vnode)) 683 return true; 684 685 return false; 686 } 687 688 /* 689 * validate a vnode/inode 690 * - there are several things we need to check 691 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, 692 * symlink) 693 * - parent dir metadata changed (security changes) 694 * - dentry data changed (write, truncate) 695 * - dentry metadata changed (security changes) 696 */ 697 int afs_validate(struct afs_vnode *vnode, struct key *key) 698 { 699 int ret; 700 701 _enter("{v={%llx:%llu} fl=%lx},%x", 702 vnode->fid.vid, vnode->fid.vnode, vnode->flags, 703 key_serial(key)); 704 705 if (afs_pagecache_valid(vnode)) 706 goto valid; 707 708 down_write(&vnode->validate_lock); 709 710 /* if the promise has expired, we need to check the server again to get 711 * a new promise - note that if the (parent) directory's metadata was 712 * changed then the security may be different and we may no longer have 713 * access */ 714 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 715 _debug("not promised"); 716 ret = afs_fetch_status(vnode, key, false, NULL); 717 if (ret < 0) { 718 if (ret == -ENOENT) { 719 set_bit(AFS_VNODE_DELETED, &vnode->flags); 720 ret = -ESTALE; 721 } 722 goto error_unlock; 723 } 724 _debug("new promise [fl=%lx]", vnode->flags); 725 } 726 727 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 728 _debug("file already deleted"); 729 ret = -ESTALE; 730 goto error_unlock; 731 } 732 733 /* if the vnode's data version number changed then its contents are 734 * different */ 735 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 736 afs_zap_data(vnode); 737 up_write(&vnode->validate_lock); 738 valid: 739 _leave(" = 0"); 740 return 0; 741 742 error_unlock: 743 up_write(&vnode->validate_lock); 744 _leave(" = %d", ret); 745 return ret; 746 } 747 748 /* 749 * read the attributes of an inode 750 */ 751 int afs_getattr(struct mnt_idmap *idmap, const struct path *path, 752 struct kstat *stat, u32 request_mask, unsigned int query_flags) 753 { 754 struct inode *inode = d_inode(path->dentry); 755 struct afs_vnode *vnode = AFS_FS_I(inode); 756 struct key *key; 757 int ret, seq = 0; 758 759 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); 760 761 if (vnode->volume && 762 !(query_flags & AT_STATX_DONT_SYNC) && 763 !test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 764 key = afs_request_key(vnode->volume->cell); 765 if (IS_ERR(key)) 766 return PTR_ERR(key); 767 ret = afs_validate(vnode, key); 768 key_put(key); 769 if (ret < 0) 770 return ret; 771 } 772 773 do { 774 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 775 generic_fillattr(&nop_mnt_idmap, inode, stat); 776 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) && 777 stat->nlink > 0) 778 stat->nlink -= 1; 779 } while (need_seqretry(&vnode->cb_lock, seq)); 780 781 done_seqretry(&vnode->cb_lock, seq); 782 return 0; 783 } 784 785 /* 786 * discard an AFS inode 787 */ 788 int afs_drop_inode(struct inode *inode) 789 { 790 _enter(""); 791 792 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) 793 return generic_delete_inode(inode); 794 else 795 return generic_drop_inode(inode); 796 } 797 798 /* 799 * clear an AFS inode 800 */ 801 void afs_evict_inode(struct inode *inode) 802 { 803 struct afs_vnode_cache_aux aux; 804 struct afs_vnode *vnode = AFS_FS_I(inode); 805 806 _enter("{%llx:%llu.%d}", 807 vnode->fid.vid, 808 vnode->fid.vnode, 809 vnode->fid.unique); 810 811 _debug("CLEAR INODE %p", inode); 812 813 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); 814 815 truncate_inode_pages_final(&inode->i_data); 816 817 afs_set_cache_aux(vnode, &aux); 818 fscache_clear_inode_writeback(afs_vnode_cache(vnode), inode, &aux); 819 clear_inode(inode); 820 821 while (!list_empty(&vnode->wb_keys)) { 822 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, 823 struct afs_wb_key, vnode_link); 824 list_del(&wbk->vnode_link); 825 afs_put_wb_key(wbk); 826 } 827 828 fscache_relinquish_cookie(afs_vnode_cache(vnode), 829 test_bit(AFS_VNODE_DELETED, &vnode->flags)); 830 831 afs_prune_wb_keys(vnode); 832 afs_put_permits(rcu_access_pointer(vnode->permit_cache)); 833 key_put(vnode->silly_key); 834 vnode->silly_key = NULL; 835 key_put(vnode->lock_key); 836 vnode->lock_key = NULL; 837 _leave(""); 838 } 839 840 static void afs_setattr_success(struct afs_operation *op) 841 { 842 struct afs_vnode_param *vp = &op->file[0]; 843 struct inode *inode = &vp->vnode->netfs.inode; 844 loff_t old_i_size = i_size_read(inode); 845 846 op->setattr.old_i_size = old_i_size; 847 afs_vnode_commit_status(op, vp); 848 /* inode->i_size has now been changed. */ 849 850 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 851 loff_t size = op->setattr.attr->ia_size; 852 if (size > old_i_size) 853 pagecache_isize_extended(inode, old_i_size, size); 854 } 855 } 856 857 static void afs_setattr_edit_file(struct afs_operation *op) 858 { 859 struct afs_vnode_param *vp = &op->file[0]; 860 struct inode *inode = &vp->vnode->netfs.inode; 861 862 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 863 loff_t size = op->setattr.attr->ia_size; 864 loff_t i_size = op->setattr.old_i_size; 865 866 if (size < i_size) 867 truncate_pagecache(inode, size); 868 if (size != i_size) 869 fscache_resize_cookie(afs_vnode_cache(vp->vnode), 870 vp->scb.status.size); 871 } 872 } 873 874 static const struct afs_operation_ops afs_setattr_operation = { 875 .issue_afs_rpc = afs_fs_setattr, 876 .issue_yfs_rpc = yfs_fs_setattr, 877 .success = afs_setattr_success, 878 .edit_dir = afs_setattr_edit_file, 879 }; 880 881 /* 882 * set the attributes of an inode 883 */ 884 int afs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 885 struct iattr *attr) 886 { 887 const unsigned int supported = 888 ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | 889 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH; 890 struct afs_operation *op; 891 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 892 struct inode *inode = &vnode->netfs.inode; 893 loff_t i_size; 894 int ret; 895 896 _enter("{%llx:%llu},{n=%pd},%x", 897 vnode->fid.vid, vnode->fid.vnode, dentry, 898 attr->ia_valid); 899 900 if (!(attr->ia_valid & supported)) { 901 _leave(" = 0 [unsupported]"); 902 return 0; 903 } 904 905 i_size = i_size_read(inode); 906 if (attr->ia_valid & ATTR_SIZE) { 907 if (!S_ISREG(inode->i_mode)) 908 return -EISDIR; 909 910 ret = inode_newsize_ok(inode, attr->ia_size); 911 if (ret) 912 return ret; 913 914 if (attr->ia_size == i_size) 915 attr->ia_valid &= ~ATTR_SIZE; 916 } 917 918 fscache_use_cookie(afs_vnode_cache(vnode), true); 919 920 /* Prevent any new writebacks from starting whilst we do this. */ 921 down_write(&vnode->validate_lock); 922 923 if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) { 924 loff_t size = attr->ia_size; 925 926 /* Wait for any outstanding writes to the server to complete */ 927 loff_t from = min(size, i_size); 928 loff_t to = max(size, i_size); 929 ret = filemap_fdatawait_range(inode->i_mapping, from, to); 930 if (ret < 0) 931 goto out_unlock; 932 933 /* Don't talk to the server if we're just shortening in-memory 934 * writes that haven't gone to the server yet. 935 */ 936 if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) && 937 attr->ia_size < i_size && 938 attr->ia_size > vnode->status.size) { 939 truncate_pagecache(inode, attr->ia_size); 940 fscache_resize_cookie(afs_vnode_cache(vnode), 941 attr->ia_size); 942 i_size_write(inode, attr->ia_size); 943 ret = 0; 944 goto out_unlock; 945 } 946 } 947 948 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? 949 afs_file_key(attr->ia_file) : NULL), 950 vnode->volume); 951 if (IS_ERR(op)) { 952 ret = PTR_ERR(op); 953 goto out_unlock; 954 } 955 956 afs_op_set_vnode(op, 0, vnode); 957 op->setattr.attr = attr; 958 959 if (attr->ia_valid & ATTR_SIZE) { 960 op->file[0].dv_delta = 1; 961 op->file[0].set_size = true; 962 } 963 op->ctime = attr->ia_ctime; 964 op->file[0].update_ctime = 1; 965 op->file[0].modification = true; 966 967 op->ops = &afs_setattr_operation; 968 ret = afs_do_sync_operation(op); 969 970 out_unlock: 971 up_write(&vnode->validate_lock); 972 fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL); 973 _leave(" = %d", ret); 974 return ret; 975 } 976