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 the file size and block count. Estimate the number of 512 bytes blocks 58 * used, rounded up to nearest 1K for consistency with other AFS clients. 59 */ 60 static void afs_set_i_size(struct afs_vnode *vnode, u64 size) 61 { 62 i_size_write(&vnode->vfs_inode, size); 63 vnode->vfs_inode.i_blocks = ((size + 1023) >> 10) << 1; 64 } 65 66 /* 67 * Initialise an inode from the vnode status. 68 */ 69 static int afs_inode_init_from_status(struct afs_operation *op, 70 struct afs_vnode_param *vp, 71 struct afs_vnode *vnode) 72 { 73 struct afs_file_status *status = &vp->scb.status; 74 struct inode *inode = AFS_VNODE_TO_I(vnode); 75 struct timespec64 t; 76 77 _enter("{%llx:%llu.%u} %s", 78 vp->fid.vid, vp->fid.vnode, vp->fid.unique, 79 op->type ? op->type->name : "???"); 80 81 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", 82 status->type, 83 status->nlink, 84 (unsigned long long) status->size, 85 status->data_version, 86 status->mode); 87 88 write_seqlock(&vnode->cb_lock); 89 90 vnode->cb_v_break = op->cb_v_break; 91 vnode->cb_s_break = op->cb_s_break; 92 vnode->status = *status; 93 94 t = status->mtime_client; 95 inode->i_ctime = t; 96 inode->i_mtime = t; 97 inode->i_atime = t; 98 inode->i_flags |= S_NOATIME; 99 inode->i_uid = make_kuid(&init_user_ns, status->owner); 100 inode->i_gid = make_kgid(&init_user_ns, status->group); 101 set_nlink(&vnode->vfs_inode, status->nlink); 102 103 switch (status->type) { 104 case AFS_FTYPE_FILE: 105 inode->i_mode = S_IFREG | (status->mode & S_IALLUGO); 106 inode->i_op = &afs_file_inode_operations; 107 inode->i_fop = &afs_file_operations; 108 inode->i_mapping->a_ops = &afs_fs_aops; 109 break; 110 case AFS_FTYPE_DIR: 111 inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO); 112 inode->i_op = &afs_dir_inode_operations; 113 inode->i_fop = &afs_dir_file_operations; 114 inode->i_mapping->a_ops = &afs_dir_aops; 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_fs_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_fs_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); 141 142 vnode->invalid_before = status->data_version; 143 inode_set_iversion_raw(&vnode->vfs_inode, status->data_version); 144 145 if (!vp->scb.have_cb) { 146 /* it's a symlink we just created (the fileserver 147 * didn't give us a callback) */ 148 vnode->cb_expires_at = ktime_get_real_seconds(); 149 } else { 150 vnode->cb_expires_at = vp->scb.callback.expires_at; 151 vnode->cb_server = op->server; 152 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 153 } 154 155 write_sequnlock(&vnode->cb_lock); 156 return 0; 157 } 158 159 /* 160 * Update the core inode struct from a returned status record. 161 */ 162 static void afs_apply_status(struct afs_operation *op, 163 struct afs_vnode_param *vp) 164 { 165 struct afs_file_status *status = &vp->scb.status; 166 struct afs_vnode *vnode = vp->vnode; 167 struct inode *inode = &vnode->vfs_inode; 168 struct timespec64 t; 169 umode_t mode; 170 bool data_changed = false; 171 bool change_size = vp->set_size; 172 173 _enter("{%llx:%llu.%u} %s", 174 vp->fid.vid, vp->fid.vnode, vp->fid.unique, 175 op->type ? op->type->name : "???"); 176 177 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags)); 178 179 if (status->type != vnode->status.type) { 180 pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n", 181 vnode->fid.vid, 182 vnode->fid.vnode, 183 vnode->fid.unique, 184 status->type, vnode->status.type); 185 afs_protocol_error(NULL, afs_eproto_bad_status); 186 return; 187 } 188 189 if (status->nlink != vnode->status.nlink) 190 set_nlink(inode, status->nlink); 191 192 if (status->owner != vnode->status.owner) 193 inode->i_uid = make_kuid(&init_user_ns, status->owner); 194 195 if (status->group != vnode->status.group) 196 inode->i_gid = make_kgid(&init_user_ns, status->group); 197 198 if (status->mode != vnode->status.mode) { 199 mode = inode->i_mode; 200 mode &= ~S_IALLUGO; 201 mode |= status->mode & S_IALLUGO; 202 WRITE_ONCE(inode->i_mode, mode); 203 } 204 205 t = status->mtime_client; 206 inode->i_mtime = t; 207 if (vp->update_ctime) 208 inode->i_ctime = op->ctime; 209 210 if (vnode->status.data_version != status->data_version) 211 data_changed = true; 212 213 vnode->status = *status; 214 215 if (vp->dv_before + vp->dv_delta != status->data_version) { 216 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) 217 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s (op=%x)\n", 218 vnode->fid.vid, vnode->fid.vnode, 219 (unsigned long long)vp->dv_before + vp->dv_delta, 220 (unsigned long long)status->data_version, 221 op->type ? op->type->name : "???", 222 op->debug_id); 223 224 vnode->invalid_before = status->data_version; 225 if (vnode->status.type == AFS_FTYPE_DIR) { 226 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 227 afs_stat_v(vnode, n_inval); 228 } else { 229 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags); 230 } 231 change_size = true; 232 } else if (vnode->status.type == AFS_FTYPE_DIR) { 233 /* Expected directory change is handled elsewhere so 234 * that we can locally edit the directory and save on a 235 * download. 236 */ 237 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 238 data_changed = false; 239 change_size = true; 240 } 241 242 if (data_changed) { 243 inode_set_iversion_raw(inode, status->data_version); 244 245 /* Only update the size if the data version jumped. If the 246 * file is being modified locally, then we might have our own 247 * idea of what the size should be that's not the same as 248 * what's on the server. 249 */ 250 if (change_size) { 251 afs_set_i_size(vnode, status->size); 252 inode->i_ctime = t; 253 inode->i_atime = t; 254 } 255 } 256 } 257 258 /* 259 * Apply a callback to a vnode. 260 */ 261 static void afs_apply_callback(struct afs_operation *op, 262 struct afs_vnode_param *vp) 263 { 264 struct afs_callback *cb = &vp->scb.callback; 265 struct afs_vnode *vnode = vp->vnode; 266 267 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) { 268 vnode->cb_expires_at = cb->expires_at; 269 vnode->cb_server = op->server; 270 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 271 } 272 } 273 274 /* 275 * Apply the received status and callback to an inode all in the same critical 276 * section to avoid races with afs_validate(). 277 */ 278 void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp) 279 { 280 struct afs_vnode *vnode = vp->vnode; 281 282 _enter(""); 283 284 write_seqlock(&vnode->cb_lock); 285 286 if (vp->scb.have_error) { 287 /* A YFS server will return this from RemoveFile2 and AFS and 288 * YFS will return this from InlineBulkStatus. 289 */ 290 if (vp->scb.status.abort_code == VNOVNODE) { 291 set_bit(AFS_VNODE_DELETED, &vnode->flags); 292 clear_nlink(&vnode->vfs_inode); 293 __afs_break_callback(vnode, afs_cb_break_for_deleted); 294 op->flags &= ~AFS_OPERATION_DIR_CONFLICT; 295 } 296 } else if (vp->scb.have_status) { 297 if (vp->speculative && 298 (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) || 299 vp->dv_before != vnode->status.data_version)) 300 /* Ignore the result of a speculative bulk status fetch 301 * if it splits around a modification op, thereby 302 * appearing to regress the data version. 303 */ 304 goto out; 305 afs_apply_status(op, vp); 306 if (vp->scb.have_cb) 307 afs_apply_callback(op, vp); 308 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) { 309 drop_nlink(&vnode->vfs_inode); 310 if (vnode->vfs_inode.i_nlink == 0) { 311 set_bit(AFS_VNODE_DELETED, &vnode->flags); 312 __afs_break_callback(vnode, afs_cb_break_for_deleted); 313 } 314 } 315 316 out: 317 write_sequnlock(&vnode->cb_lock); 318 319 if (vp->scb.have_status) 320 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 321 } 322 323 static void afs_fetch_status_success(struct afs_operation *op) 324 { 325 struct afs_vnode_param *vp = &op->file[op->fetch_status.which]; 326 struct afs_vnode *vnode = vp->vnode; 327 int ret; 328 329 if (vnode->vfs_inode.i_state & I_NEW) { 330 ret = afs_inode_init_from_status(op, vp, vnode); 331 op->error = ret; 332 if (ret == 0) 333 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 334 } else { 335 afs_vnode_commit_status(op, vp); 336 } 337 } 338 339 const struct afs_operation_ops afs_fetch_status_operation = { 340 .issue_afs_rpc = afs_fs_fetch_status, 341 .issue_yfs_rpc = yfs_fs_fetch_status, 342 .success = afs_fetch_status_success, 343 .aborted = afs_check_for_remote_deletion, 344 }; 345 346 /* 347 * Fetch file status from the volume. 348 */ 349 int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new, 350 afs_access_t *_caller_access) 351 { 352 struct afs_operation *op; 353 354 _enter("%s,{%llx:%llu.%u,S=%lx}", 355 vnode->volume->name, 356 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, 357 vnode->flags); 358 359 op = afs_alloc_operation(key, vnode->volume); 360 if (IS_ERR(op)) 361 return PTR_ERR(op); 362 363 afs_op_set_vnode(op, 0, vnode); 364 365 op->nr_files = 1; 366 op->ops = &afs_fetch_status_operation; 367 afs_begin_vnode_operation(op); 368 afs_wait_for_operation(op); 369 370 if (_caller_access) 371 *_caller_access = op->file[0].scb.status.caller_access; 372 return afs_put_operation(op); 373 } 374 375 /* 376 * ilookup() comparator 377 */ 378 int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque) 379 { 380 struct afs_vnode *vnode = AFS_FS_I(inode); 381 struct afs_fid *fid = opaque; 382 383 return (fid->vnode == vnode->fid.vnode && 384 fid->vnode_hi == vnode->fid.vnode_hi && 385 fid->unique == vnode->fid.unique); 386 } 387 388 /* 389 * iget5() comparator 390 */ 391 static int afs_iget5_test(struct inode *inode, void *opaque) 392 { 393 struct afs_vnode_param *vp = opaque; 394 //struct afs_vnode *vnode = AFS_FS_I(inode); 395 396 return afs_ilookup5_test_by_fid(inode, &vp->fid); 397 } 398 399 /* 400 * iget5() inode initialiser 401 */ 402 static int afs_iget5_set(struct inode *inode, void *opaque) 403 { 404 struct afs_vnode_param *vp = opaque; 405 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 406 struct afs_vnode *vnode = AFS_FS_I(inode); 407 408 vnode->volume = as->volume; 409 vnode->fid = vp->fid; 410 411 /* YFS supports 96-bit vnode IDs, but Linux only supports 412 * 64-bit inode numbers. 413 */ 414 inode->i_ino = vnode->fid.vnode; 415 inode->i_generation = vnode->fid.unique; 416 return 0; 417 } 418 419 /* 420 * Get a cache cookie for an inode. 421 */ 422 static void afs_get_inode_cache(struct afs_vnode *vnode) 423 { 424 #ifdef CONFIG_AFS_FSCACHE 425 struct { 426 u32 vnode_id; 427 u32 unique; 428 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */ 429 } __packed key; 430 struct afs_vnode_cache_aux aux; 431 432 if (vnode->status.type != AFS_FTYPE_FILE) { 433 vnode->cache = NULL; 434 return; 435 } 436 437 key.vnode_id = vnode->fid.vnode; 438 key.unique = vnode->fid.unique; 439 key.vnode_id_ext[0] = vnode->fid.vnode >> 32; 440 key.vnode_id_ext[1] = vnode->fid.vnode_hi; 441 aux.data_version = vnode->status.data_version; 442 443 vnode->cache = fscache_acquire_cookie(vnode->volume->cache, 444 &afs_vnode_cache_index_def, 445 &key, sizeof(key), 446 &aux, sizeof(aux), 447 vnode, vnode->status.size, true); 448 #endif 449 } 450 451 /* 452 * inode retrieval 453 */ 454 struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp) 455 { 456 struct afs_vnode_param *dvp = &op->file[0]; 457 struct super_block *sb = dvp->vnode->vfs_inode.i_sb; 458 struct afs_vnode *vnode; 459 struct inode *inode; 460 int ret; 461 462 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique); 463 464 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp); 465 if (!inode) { 466 _leave(" = -ENOMEM"); 467 return ERR_PTR(-ENOMEM); 468 } 469 470 vnode = AFS_FS_I(inode); 471 472 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", 473 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); 474 475 /* deal with an existing inode */ 476 if (!(inode->i_state & I_NEW)) { 477 _leave(" = %p", inode); 478 return inode; 479 } 480 481 ret = afs_inode_init_from_status(op, vp, vnode); 482 if (ret < 0) 483 goto bad_inode; 484 485 afs_get_inode_cache(vnode); 486 487 /* success */ 488 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 489 unlock_new_inode(inode); 490 _leave(" = %p", inode); 491 return inode; 492 493 /* failure */ 494 bad_inode: 495 iget_failed(inode); 496 _leave(" = %d [bad]", ret); 497 return ERR_PTR(ret); 498 } 499 500 static int afs_iget5_set_root(struct inode *inode, void *opaque) 501 { 502 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 503 struct afs_vnode *vnode = AFS_FS_I(inode); 504 505 vnode->volume = as->volume; 506 vnode->fid.vid = as->volume->vid, 507 vnode->fid.vnode = 1; 508 vnode->fid.unique = 1; 509 inode->i_ino = 1; 510 inode->i_generation = 1; 511 return 0; 512 } 513 514 /* 515 * Set up the root inode for a volume. This is always vnode 1, unique 1 within 516 * the volume. 517 */ 518 struct inode *afs_root_iget(struct super_block *sb, struct key *key) 519 { 520 struct afs_super_info *as = AFS_FS_S(sb); 521 struct afs_operation *op; 522 struct afs_vnode *vnode; 523 struct inode *inode; 524 int ret; 525 526 _enter(",{%llx},,", as->volume->vid); 527 528 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL); 529 if (!inode) { 530 _leave(" = -ENOMEM"); 531 return ERR_PTR(-ENOMEM); 532 } 533 534 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid); 535 536 BUG_ON(!(inode->i_state & I_NEW)); 537 538 vnode = AFS_FS_I(inode); 539 vnode->cb_v_break = as->volume->cb_v_break, 540 541 op = afs_alloc_operation(key, as->volume); 542 if (IS_ERR(op)) { 543 ret = PTR_ERR(op); 544 goto error; 545 } 546 547 afs_op_set_vnode(op, 0, vnode); 548 549 op->nr_files = 1; 550 op->ops = &afs_fetch_status_operation; 551 ret = afs_do_sync_operation(op); 552 if (ret < 0) 553 goto error; 554 555 afs_get_inode_cache(vnode); 556 557 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 558 unlock_new_inode(inode); 559 _leave(" = %p", inode); 560 return inode; 561 562 error: 563 iget_failed(inode); 564 _leave(" = %d [bad]", ret); 565 return ERR_PTR(ret); 566 } 567 568 /* 569 * mark the data attached to an inode as obsolete due to a write on the server 570 * - might also want to ditch all the outstanding writes and dirty pages 571 */ 572 static void afs_zap_data(struct afs_vnode *vnode) 573 { 574 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); 575 576 #ifdef CONFIG_AFS_FSCACHE 577 fscache_invalidate(vnode->cache); 578 #endif 579 580 /* nuke all the non-dirty pages that aren't locked, mapped or being 581 * written back in a regular file and completely discard the pages in a 582 * directory or symlink */ 583 if (S_ISREG(vnode->vfs_inode.i_mode)) 584 invalidate_remote_inode(&vnode->vfs_inode); 585 else 586 invalidate_inode_pages2(vnode->vfs_inode.i_mapping); 587 } 588 589 /* 590 * Get the server reinit counter for a vnode's current server. 591 */ 592 static bool afs_get_s_break_rcu(struct afs_vnode *vnode, unsigned int *_s_break) 593 { 594 struct afs_server_list *slist = rcu_dereference(vnode->volume->servers); 595 struct afs_server *server; 596 int i; 597 598 for (i = 0; i < slist->nr_servers; i++) { 599 server = slist->servers[i].server; 600 if (server == vnode->cb_server) { 601 *_s_break = READ_ONCE(server->cb_s_break); 602 return true; 603 } 604 } 605 606 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 struct afs_volume *volume = vnode->volume; 615 enum afs_cb_break_reason need_clear = afs_cb_break_no_break; 616 time64_t now = ktime_get_real_seconds(); 617 bool valid; 618 unsigned int cb_break, cb_s_break, cb_v_break; 619 int seq = 0; 620 621 do { 622 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 623 cb_v_break = READ_ONCE(volume->cb_v_break); 624 cb_break = vnode->cb_break; 625 626 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && 627 afs_get_s_break_rcu(vnode, &cb_s_break)) { 628 if (vnode->cb_s_break != cb_s_break || 629 vnode->cb_v_break != cb_v_break) { 630 vnode->cb_s_break = cb_s_break; 631 vnode->cb_v_break = cb_v_break; 632 need_clear = afs_cb_break_for_vsbreak; 633 valid = false; 634 } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { 635 need_clear = afs_cb_break_for_zap; 636 valid = false; 637 } else if (vnode->cb_expires_at - 10 <= now) { 638 need_clear = afs_cb_break_for_lapsed; 639 valid = false; 640 } else { 641 valid = true; 642 } 643 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 644 valid = true; 645 } else { 646 vnode->cb_v_break = cb_v_break; 647 valid = false; 648 } 649 650 } while (need_seqretry(&vnode->cb_lock, seq)); 651 652 done_seqretry(&vnode->cb_lock, seq); 653 654 if (need_clear != afs_cb_break_no_break) { 655 write_seqlock(&vnode->cb_lock); 656 if (cb_break == vnode->cb_break) 657 __afs_break_callback(vnode, need_clear); 658 else 659 trace_afs_cb_miss(&vnode->fid, need_clear); 660 write_sequnlock(&vnode->cb_lock); 661 valid = false; 662 } 663 664 return valid; 665 } 666 667 /* 668 * validate a vnode/inode 669 * - there are several things we need to check 670 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, 671 * symlink) 672 * - parent dir metadata changed (security changes) 673 * - dentry data changed (write, truncate) 674 * - dentry metadata changed (security changes) 675 */ 676 int afs_validate(struct afs_vnode *vnode, struct key *key) 677 { 678 bool valid; 679 int ret; 680 681 _enter("{v={%llx:%llu} fl=%lx},%x", 682 vnode->fid.vid, vnode->fid.vnode, vnode->flags, 683 key_serial(key)); 684 685 rcu_read_lock(); 686 valid = afs_check_validity(vnode); 687 rcu_read_unlock(); 688 689 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 690 clear_nlink(&vnode->vfs_inode); 691 692 if (valid) 693 goto valid; 694 695 down_write(&vnode->validate_lock); 696 697 /* if the promise has expired, we need to check the server again to get 698 * a new promise - note that if the (parent) directory's metadata was 699 * changed then the security may be different and we may no longer have 700 * access */ 701 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 702 _debug("not promised"); 703 ret = afs_fetch_status(vnode, key, false, NULL); 704 if (ret < 0) { 705 if (ret == -ENOENT) { 706 set_bit(AFS_VNODE_DELETED, &vnode->flags); 707 ret = -ESTALE; 708 } 709 goto error_unlock; 710 } 711 _debug("new promise [fl=%lx]", vnode->flags); 712 } 713 714 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 715 _debug("file already deleted"); 716 ret = -ESTALE; 717 goto error_unlock; 718 } 719 720 /* if the vnode's data version number changed then its contents are 721 * different */ 722 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 723 afs_zap_data(vnode); 724 up_write(&vnode->validate_lock); 725 valid: 726 _leave(" = 0"); 727 return 0; 728 729 error_unlock: 730 up_write(&vnode->validate_lock); 731 _leave(" = %d", ret); 732 return ret; 733 } 734 735 /* 736 * read the attributes of an inode 737 */ 738 int afs_getattr(struct user_namespace *mnt_userns, const struct path *path, 739 struct kstat *stat, u32 request_mask, unsigned int query_flags) 740 { 741 struct inode *inode = d_inode(path->dentry); 742 struct afs_vnode *vnode = AFS_FS_I(inode); 743 int seq = 0; 744 745 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); 746 747 do { 748 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 749 generic_fillattr(&init_user_ns, inode, stat); 750 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) && 751 stat->nlink > 0) 752 stat->nlink -= 1; 753 } while (need_seqretry(&vnode->cb_lock, seq)); 754 755 done_seqretry(&vnode->cb_lock, seq); 756 return 0; 757 } 758 759 /* 760 * discard an AFS inode 761 */ 762 int afs_drop_inode(struct inode *inode) 763 { 764 _enter(""); 765 766 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) 767 return generic_delete_inode(inode); 768 else 769 return generic_drop_inode(inode); 770 } 771 772 /* 773 * clear an AFS inode 774 */ 775 void afs_evict_inode(struct inode *inode) 776 { 777 struct afs_vnode *vnode; 778 779 vnode = AFS_FS_I(inode); 780 781 _enter("{%llx:%llu.%d}", 782 vnode->fid.vid, 783 vnode->fid.vnode, 784 vnode->fid.unique); 785 786 _debug("CLEAR INODE %p", inode); 787 788 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); 789 790 truncate_inode_pages_final(&inode->i_data); 791 clear_inode(inode); 792 793 while (!list_empty(&vnode->wb_keys)) { 794 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, 795 struct afs_wb_key, vnode_link); 796 list_del(&wbk->vnode_link); 797 afs_put_wb_key(wbk); 798 } 799 800 #ifdef CONFIG_AFS_FSCACHE 801 { 802 struct afs_vnode_cache_aux aux; 803 804 aux.data_version = vnode->status.data_version; 805 fscache_relinquish_cookie(vnode->cache, &aux, 806 test_bit(AFS_VNODE_DELETED, &vnode->flags)); 807 vnode->cache = NULL; 808 } 809 #endif 810 811 afs_prune_wb_keys(vnode); 812 afs_put_permits(rcu_access_pointer(vnode->permit_cache)); 813 key_put(vnode->silly_key); 814 vnode->silly_key = NULL; 815 key_put(vnode->lock_key); 816 vnode->lock_key = NULL; 817 _leave(""); 818 } 819 820 static void afs_setattr_success(struct afs_operation *op) 821 { 822 struct afs_vnode_param *vp = &op->file[0]; 823 struct inode *inode = &vp->vnode->vfs_inode; 824 loff_t old_i_size = i_size_read(inode); 825 826 op->setattr.old_i_size = old_i_size; 827 afs_vnode_commit_status(op, vp); 828 /* inode->i_size has now been changed. */ 829 830 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 831 loff_t size = op->setattr.attr->ia_size; 832 if (size > old_i_size) 833 pagecache_isize_extended(inode, old_i_size, size); 834 } 835 } 836 837 static void afs_setattr_edit_file(struct afs_operation *op) 838 { 839 struct afs_vnode_param *vp = &op->file[0]; 840 struct inode *inode = &vp->vnode->vfs_inode; 841 842 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 843 loff_t size = op->setattr.attr->ia_size; 844 loff_t i_size = op->setattr.old_i_size; 845 846 if (size < i_size) 847 truncate_pagecache(inode, size); 848 } 849 } 850 851 static const struct afs_operation_ops afs_setattr_operation = { 852 .issue_afs_rpc = afs_fs_setattr, 853 .issue_yfs_rpc = yfs_fs_setattr, 854 .success = afs_setattr_success, 855 .edit_dir = afs_setattr_edit_file, 856 }; 857 858 /* 859 * set the attributes of an inode 860 */ 861 int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, 862 struct iattr *attr) 863 { 864 struct afs_operation *op; 865 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 866 int ret; 867 868 _enter("{%llx:%llu},{n=%pd},%x", 869 vnode->fid.vid, vnode->fid.vnode, dentry, 870 attr->ia_valid); 871 872 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | 873 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | 874 ATTR_TOUCH))) { 875 _leave(" = 0 [unsupported]"); 876 return 0; 877 } 878 879 if (attr->ia_valid & ATTR_SIZE) { 880 if (!S_ISREG(vnode->vfs_inode.i_mode)) 881 return -EISDIR; 882 883 ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size); 884 if (ret) 885 return ret; 886 887 if (attr->ia_size == i_size_read(&vnode->vfs_inode)) 888 attr->ia_valid &= ~ATTR_SIZE; 889 } 890 891 /* flush any dirty data outstanding on a regular file */ 892 if (S_ISREG(vnode->vfs_inode.i_mode)) 893 filemap_write_and_wait(vnode->vfs_inode.i_mapping); 894 895 /* Prevent any new writebacks from starting whilst we do this. */ 896 down_write(&vnode->validate_lock); 897 898 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? 899 afs_file_key(attr->ia_file) : NULL), 900 vnode->volume); 901 if (IS_ERR(op)) { 902 ret = PTR_ERR(op); 903 goto out_unlock; 904 } 905 906 afs_op_set_vnode(op, 0, vnode); 907 op->setattr.attr = attr; 908 909 if (attr->ia_valid & ATTR_SIZE) { 910 op->file[0].dv_delta = 1; 911 op->file[0].set_size = true; 912 } 913 op->ctime = attr->ia_ctime; 914 op->file[0].update_ctime = 1; 915 op->file[0].modification = true; 916 917 op->ops = &afs_setattr_operation; 918 ret = afs_do_sync_operation(op); 919 920 out_unlock: 921 up_write(&vnode->validate_lock); 922 _leave(" = %d", ret); 923 return ret; 924 } 925