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 break; 108 case AFS_FTYPE_DIR: 109 inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO); 110 inode->i_op = &afs_dir_inode_operations; 111 inode->i_fop = &afs_dir_file_operations; 112 inode->i_mapping->a_ops = &afs_dir_aops; 113 break; 114 case AFS_FTYPE_SYMLINK: 115 /* Symlinks with a mode of 0644 are actually mountpoints. */ 116 if ((status->mode & 0777) == 0644) { 117 inode->i_flags |= S_AUTOMOUNT; 118 119 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); 120 121 inode->i_mode = S_IFDIR | 0555; 122 inode->i_op = &afs_mntpt_inode_operations; 123 inode->i_fop = &afs_mntpt_file_operations; 124 inode->i_mapping->a_ops = &afs_symlink_aops; 125 } else { 126 inode->i_mode = S_IFLNK | status->mode; 127 inode->i_op = &afs_symlink_inode_operations; 128 inode->i_mapping->a_ops = &afs_symlink_aops; 129 } 130 inode_nohighmem(inode); 131 break; 132 default: 133 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL); 134 write_sequnlock(&vnode->cb_lock); 135 return afs_protocol_error(NULL, afs_eproto_file_type); 136 } 137 138 afs_set_i_size(vnode, status->size); 139 afs_set_netfs_context(vnode); 140 141 vnode->invalid_before = status->data_version; 142 inode_set_iversion_raw(&vnode->netfs.inode, status->data_version); 143 144 if (!vp->scb.have_cb) { 145 /* it's a symlink we just created (the fileserver 146 * didn't give us a callback) */ 147 vnode->cb_expires_at = ktime_get_real_seconds(); 148 } else { 149 vnode->cb_expires_at = vp->scb.callback.expires_at; 150 vnode->cb_server = op->server; 151 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 152 } 153 154 write_sequnlock(&vnode->cb_lock); 155 return 0; 156 } 157 158 /* 159 * Update the core inode struct from a returned status record. 160 */ 161 static void afs_apply_status(struct afs_operation *op, 162 struct afs_vnode_param *vp) 163 { 164 struct afs_file_status *status = &vp->scb.status; 165 struct afs_vnode *vnode = vp->vnode; 166 struct inode *inode = &vnode->netfs.inode; 167 struct timespec64 t; 168 umode_t mode; 169 bool data_changed = false; 170 bool change_size = vp->set_size; 171 172 _enter("{%llx:%llu.%u} %s", 173 vp->fid.vid, vp->fid.vnode, vp->fid.unique, 174 op->type ? op->type->name : "???"); 175 176 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags)); 177 178 if (status->type != vnode->status.type) { 179 pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n", 180 vnode->fid.vid, 181 vnode->fid.vnode, 182 vnode->fid.unique, 183 status->type, vnode->status.type); 184 afs_protocol_error(NULL, afs_eproto_bad_status); 185 return; 186 } 187 188 if (status->nlink != vnode->status.nlink) 189 set_nlink(inode, status->nlink); 190 191 if (status->owner != vnode->status.owner) 192 inode->i_uid = make_kuid(&init_user_ns, status->owner); 193 194 if (status->group != vnode->status.group) 195 inode->i_gid = make_kgid(&init_user_ns, status->group); 196 197 if (status->mode != vnode->status.mode) { 198 mode = inode->i_mode; 199 mode &= ~S_IALLUGO; 200 mode |= status->mode & S_IALLUGO; 201 WRITE_ONCE(inode->i_mode, mode); 202 } 203 204 t = status->mtime_client; 205 inode->i_mtime = t; 206 if (vp->update_ctime) 207 inode->i_ctime = op->ctime; 208 209 if (vnode->status.data_version != status->data_version) 210 data_changed = true; 211 212 vnode->status = *status; 213 214 if (vp->dv_before + vp->dv_delta != status->data_version) { 215 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) 216 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s (op=%x)\n", 217 vnode->fid.vid, vnode->fid.vnode, 218 (unsigned long long)vp->dv_before + vp->dv_delta, 219 (unsigned long long)status->data_version, 220 op->type ? op->type->name : "???", 221 op->debug_id); 222 223 vnode->invalid_before = status->data_version; 224 if (vnode->status.type == AFS_FTYPE_DIR) { 225 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 226 afs_stat_v(vnode, n_inval); 227 } else { 228 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags); 229 } 230 change_size = true; 231 } else if (vnode->status.type == AFS_FTYPE_DIR) { 232 /* Expected directory change is handled elsewhere so 233 * that we can locally edit the directory and save on a 234 * download. 235 */ 236 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 237 data_changed = false; 238 change_size = true; 239 } 240 241 if (data_changed) { 242 inode_set_iversion_raw(inode, status->data_version); 243 244 /* Only update the size if the data version jumped. If the 245 * file is being modified locally, then we might have our own 246 * idea of what the size should be that's not the same as 247 * what's on the server. 248 */ 249 vnode->netfs.remote_i_size = status->size; 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->netfs.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->netfs.inode); 310 if (vnode->netfs.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->netfs.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 __be32 vnode_id; 427 __be32 unique; 428 __be32 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->netfs.cache = NULL; 434 return; 435 } 436 437 key.vnode_id = htonl(vnode->fid.vnode); 438 key.unique = htonl(vnode->fid.unique); 439 key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32); 440 key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi); 441 afs_set_cache_aux(vnode, &aux); 442 443 afs_vnode_set_cache(vnode, 444 fscache_acquire_cookie( 445 vnode->volume->cache, 446 vnode->status.type == AFS_FTYPE_FILE ? 447 0 : FSCACHE_ADV_SINGLE_CHUNK, 448 &key, sizeof(key), 449 &aux, sizeof(aux), 450 vnode->status.size)); 451 #endif 452 } 453 454 /* 455 * inode retrieval 456 */ 457 struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp) 458 { 459 struct afs_vnode_param *dvp = &op->file[0]; 460 struct super_block *sb = dvp->vnode->netfs.inode.i_sb; 461 struct afs_vnode *vnode; 462 struct inode *inode; 463 int ret; 464 465 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique); 466 467 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp); 468 if (!inode) { 469 _leave(" = -ENOMEM"); 470 return ERR_PTR(-ENOMEM); 471 } 472 473 vnode = AFS_FS_I(inode); 474 475 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", 476 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); 477 478 /* deal with an existing inode */ 479 if (!(inode->i_state & I_NEW)) { 480 _leave(" = %p", inode); 481 return inode; 482 } 483 484 ret = afs_inode_init_from_status(op, vp, vnode); 485 if (ret < 0) 486 goto bad_inode; 487 488 afs_get_inode_cache(vnode); 489 490 /* success */ 491 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 492 unlock_new_inode(inode); 493 _leave(" = %p", inode); 494 return inode; 495 496 /* failure */ 497 bad_inode: 498 iget_failed(inode); 499 _leave(" = %d [bad]", ret); 500 return ERR_PTR(ret); 501 } 502 503 static int afs_iget5_set_root(struct inode *inode, void *opaque) 504 { 505 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 506 struct afs_vnode *vnode = AFS_FS_I(inode); 507 508 vnode->volume = as->volume; 509 vnode->fid.vid = as->volume->vid, 510 vnode->fid.vnode = 1; 511 vnode->fid.unique = 1; 512 inode->i_ino = 1; 513 inode->i_generation = 1; 514 return 0; 515 } 516 517 /* 518 * Set up the root inode for a volume. This is always vnode 1, unique 1 within 519 * the volume. 520 */ 521 struct inode *afs_root_iget(struct super_block *sb, struct key *key) 522 { 523 struct afs_super_info *as = AFS_FS_S(sb); 524 struct afs_operation *op; 525 struct afs_vnode *vnode; 526 struct inode *inode; 527 int ret; 528 529 _enter(",{%llx},,", as->volume->vid); 530 531 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL); 532 if (!inode) { 533 _leave(" = -ENOMEM"); 534 return ERR_PTR(-ENOMEM); 535 } 536 537 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid); 538 539 BUG_ON(!(inode->i_state & I_NEW)); 540 541 vnode = AFS_FS_I(inode); 542 vnode->cb_v_break = as->volume->cb_v_break, 543 afs_set_netfs_context(vnode); 544 545 op = afs_alloc_operation(key, as->volume); 546 if (IS_ERR(op)) { 547 ret = PTR_ERR(op); 548 goto error; 549 } 550 551 afs_op_set_vnode(op, 0, vnode); 552 553 op->nr_files = 1; 554 op->ops = &afs_fetch_status_operation; 555 ret = afs_do_sync_operation(op); 556 if (ret < 0) 557 goto error; 558 559 afs_get_inode_cache(vnode); 560 561 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 562 unlock_new_inode(inode); 563 _leave(" = %p", inode); 564 return inode; 565 566 error: 567 iget_failed(inode); 568 _leave(" = %d [bad]", ret); 569 return ERR_PTR(ret); 570 } 571 572 /* 573 * mark the data attached to an inode as obsolete due to a write on the server 574 * - might also want to ditch all the outstanding writes and dirty pages 575 */ 576 static void afs_zap_data(struct afs_vnode *vnode) 577 { 578 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); 579 580 afs_invalidate_cache(vnode, 0); 581 582 /* nuke all the non-dirty pages that aren't locked, mapped or being 583 * written back in a regular file and completely discard the pages in a 584 * directory or symlink */ 585 if (S_ISREG(vnode->netfs.inode.i_mode)) 586 invalidate_remote_inode(&vnode->netfs.inode); 587 else 588 invalidate_inode_pages2(vnode->netfs.inode.i_mapping); 589 } 590 591 /* 592 * Check to see if we have a server currently serving this volume and that it 593 * hasn't been reinitialised or dropped from the list. 594 */ 595 static bool afs_check_server_good(struct afs_vnode *vnode) 596 { 597 struct afs_server_list *slist; 598 struct afs_server *server; 599 bool good; 600 int i; 601 602 if (vnode->cb_fs_s_break == atomic_read(&vnode->volume->cell->fs_s_break)) 603 return true; 604 605 rcu_read_lock(); 606 607 slist = rcu_dereference(vnode->volume->servers); 608 for (i = 0; i < slist->nr_servers; i++) { 609 server = slist->servers[i].server; 610 if (server == vnode->cb_server) { 611 good = (vnode->cb_s_break == server->cb_s_break); 612 rcu_read_unlock(); 613 return good; 614 } 615 } 616 617 rcu_read_unlock(); 618 return false; 619 } 620 621 /* 622 * Check the validity of a vnode/inode. 623 */ 624 bool afs_check_validity(struct afs_vnode *vnode) 625 { 626 enum afs_cb_break_reason need_clear = afs_cb_break_no_break; 627 time64_t now = ktime_get_real_seconds(); 628 unsigned int cb_break; 629 int seq = 0; 630 631 do { 632 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 633 cb_break = vnode->cb_break; 634 635 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 636 if (vnode->cb_v_break != vnode->volume->cb_v_break) 637 need_clear = afs_cb_break_for_v_break; 638 else if (!afs_check_server_good(vnode)) 639 need_clear = afs_cb_break_for_s_reinit; 640 else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 641 need_clear = afs_cb_break_for_zap; 642 else if (vnode->cb_expires_at - 10 <= now) 643 need_clear = afs_cb_break_for_lapsed; 644 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 645 ; 646 } else { 647 need_clear = afs_cb_break_no_promise; 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 return true; 656 657 write_seqlock(&vnode->cb_lock); 658 if (need_clear == afs_cb_break_no_promise) 659 vnode->cb_v_break = vnode->volume->cb_v_break; 660 else if (cb_break == vnode->cb_break) 661 __afs_break_callback(vnode, need_clear); 662 else 663 trace_afs_cb_miss(&vnode->fid, need_clear); 664 write_sequnlock(&vnode->cb_lock); 665 return false; 666 } 667 668 /* 669 * validate a vnode/inode 670 * - there are several things we need to check 671 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, 672 * symlink) 673 * - parent dir metadata changed (security changes) 674 * - dentry data changed (write, truncate) 675 * - dentry metadata changed (security changes) 676 */ 677 int afs_validate(struct afs_vnode *vnode, struct key *key) 678 { 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 if (unlikely(test_bit(AFS_VNODE_DELETED, &vnode->flags))) { 686 if (vnode->netfs.inode.i_nlink) 687 clear_nlink(&vnode->netfs.inode); 688 goto valid; 689 } 690 691 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && 692 afs_check_validity(vnode)) 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 struct key *key; 744 int ret, seq = 0; 745 746 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); 747 748 if (vnode->volume && 749 !(query_flags & AT_STATX_DONT_SYNC) && 750 !test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 751 key = afs_request_key(vnode->volume->cell); 752 if (IS_ERR(key)) 753 return PTR_ERR(key); 754 ret = afs_validate(vnode, key); 755 key_put(key); 756 if (ret < 0) 757 return ret; 758 } 759 760 do { 761 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 762 generic_fillattr(&init_user_ns, inode, stat); 763 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) && 764 stat->nlink > 0) 765 stat->nlink -= 1; 766 } while (need_seqretry(&vnode->cb_lock, seq)); 767 768 done_seqretry(&vnode->cb_lock, seq); 769 return 0; 770 } 771 772 /* 773 * discard an AFS inode 774 */ 775 int afs_drop_inode(struct inode *inode) 776 { 777 _enter(""); 778 779 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) 780 return generic_delete_inode(inode); 781 else 782 return generic_drop_inode(inode); 783 } 784 785 /* 786 * clear an AFS inode 787 */ 788 void afs_evict_inode(struct inode *inode) 789 { 790 struct afs_vnode_cache_aux aux; 791 struct afs_vnode *vnode = AFS_FS_I(inode); 792 793 _enter("{%llx:%llu.%d}", 794 vnode->fid.vid, 795 vnode->fid.vnode, 796 vnode->fid.unique); 797 798 _debug("CLEAR INODE %p", inode); 799 800 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); 801 802 truncate_inode_pages_final(&inode->i_data); 803 804 afs_set_cache_aux(vnode, &aux); 805 fscache_clear_inode_writeback(afs_vnode_cache(vnode), inode, &aux); 806 clear_inode(inode); 807 808 while (!list_empty(&vnode->wb_keys)) { 809 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, 810 struct afs_wb_key, vnode_link); 811 list_del(&wbk->vnode_link); 812 afs_put_wb_key(wbk); 813 } 814 815 fscache_relinquish_cookie(afs_vnode_cache(vnode), 816 test_bit(AFS_VNODE_DELETED, &vnode->flags)); 817 818 afs_prune_wb_keys(vnode); 819 afs_put_permits(rcu_access_pointer(vnode->permit_cache)); 820 key_put(vnode->silly_key); 821 vnode->silly_key = NULL; 822 key_put(vnode->lock_key); 823 vnode->lock_key = NULL; 824 _leave(""); 825 } 826 827 static void afs_setattr_success(struct afs_operation *op) 828 { 829 struct afs_vnode_param *vp = &op->file[0]; 830 struct inode *inode = &vp->vnode->netfs.inode; 831 loff_t old_i_size = i_size_read(inode); 832 833 op->setattr.old_i_size = old_i_size; 834 afs_vnode_commit_status(op, vp); 835 /* inode->i_size has now been changed. */ 836 837 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 838 loff_t size = op->setattr.attr->ia_size; 839 if (size > old_i_size) 840 pagecache_isize_extended(inode, old_i_size, size); 841 } 842 } 843 844 static void afs_setattr_edit_file(struct afs_operation *op) 845 { 846 struct afs_vnode_param *vp = &op->file[0]; 847 struct inode *inode = &vp->vnode->netfs.inode; 848 849 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 850 loff_t size = op->setattr.attr->ia_size; 851 loff_t i_size = op->setattr.old_i_size; 852 853 if (size < i_size) 854 truncate_pagecache(inode, size); 855 if (size != i_size) 856 fscache_resize_cookie(afs_vnode_cache(vp->vnode), 857 vp->scb.status.size); 858 } 859 } 860 861 static const struct afs_operation_ops afs_setattr_operation = { 862 .issue_afs_rpc = afs_fs_setattr, 863 .issue_yfs_rpc = yfs_fs_setattr, 864 .success = afs_setattr_success, 865 .edit_dir = afs_setattr_edit_file, 866 }; 867 868 /* 869 * set the attributes of an inode 870 */ 871 int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, 872 struct iattr *attr) 873 { 874 const unsigned int supported = 875 ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | 876 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH; 877 struct afs_operation *op; 878 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 879 struct inode *inode = &vnode->netfs.inode; 880 loff_t i_size; 881 int ret; 882 883 _enter("{%llx:%llu},{n=%pd},%x", 884 vnode->fid.vid, vnode->fid.vnode, dentry, 885 attr->ia_valid); 886 887 if (!(attr->ia_valid & supported)) { 888 _leave(" = 0 [unsupported]"); 889 return 0; 890 } 891 892 i_size = i_size_read(inode); 893 if (attr->ia_valid & ATTR_SIZE) { 894 if (!S_ISREG(inode->i_mode)) 895 return -EISDIR; 896 897 ret = inode_newsize_ok(inode, attr->ia_size); 898 if (ret) 899 return ret; 900 901 if (attr->ia_size == i_size) 902 attr->ia_valid &= ~ATTR_SIZE; 903 } 904 905 fscache_use_cookie(afs_vnode_cache(vnode), true); 906 907 /* Prevent any new writebacks from starting whilst we do this. */ 908 down_write(&vnode->validate_lock); 909 910 if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) { 911 loff_t size = attr->ia_size; 912 913 /* Wait for any outstanding writes to the server to complete */ 914 loff_t from = min(size, i_size); 915 loff_t to = max(size, i_size); 916 ret = filemap_fdatawait_range(inode->i_mapping, from, to); 917 if (ret < 0) 918 goto out_unlock; 919 920 /* Don't talk to the server if we're just shortening in-memory 921 * writes that haven't gone to the server yet. 922 */ 923 if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) && 924 attr->ia_size < i_size && 925 attr->ia_size > vnode->status.size) { 926 truncate_pagecache(inode, attr->ia_size); 927 fscache_resize_cookie(afs_vnode_cache(vnode), 928 attr->ia_size); 929 i_size_write(inode, attr->ia_size); 930 ret = 0; 931 goto out_unlock; 932 } 933 } 934 935 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? 936 afs_file_key(attr->ia_file) : NULL), 937 vnode->volume); 938 if (IS_ERR(op)) { 939 ret = PTR_ERR(op); 940 goto out_unlock; 941 } 942 943 afs_op_set_vnode(op, 0, vnode); 944 op->setattr.attr = attr; 945 946 if (attr->ia_valid & ATTR_SIZE) { 947 op->file[0].dv_delta = 1; 948 op->file[0].set_size = true; 949 } 950 op->ctime = attr->ia_ctime; 951 op->file[0].update_ctime = 1; 952 op->file[0].modification = true; 953 954 op->ops = &afs_setattr_operation; 955 ret = afs_do_sync_operation(op); 956 957 out_unlock: 958 up_write(&vnode->validate_lock); 959 fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL); 960 _leave(" = %d", ret); 961 return ret; 962 } 963